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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
YOSHIFUJI Hideakib1cacb62005-11-08 09:38:12 -080036 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
40
Joe Perchesf3213832012-05-15 14:11:53 +000041#define pr_fmt(fmt) "IPv6: " fmt
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/errno.h>
44#include <linux/types.h>
Ilpo Järvinena0bffff2009-03-21 13:36:17 -070045#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/socket.h>
47#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/net.h>
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +010049#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/in6.h>
51#include <linux/netdevice.h>
Thomas Graf18237302006-08-04 23:04:54 -070052#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
Randy Dunlap4fc268d2006-01-11 12:17:47 -080063#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <linux/delay.h>
65#include <linux/notifier.h>
Paulo Marques543537b2005-06-23 00:09:02 -070066#include <linux/string.h>
Eric Dumazetddbe5032012-07-18 08:11:12 +000067#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020069#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/sock.h>
71#include <net/snmp.h>
72
Alexander Aring5241c2d2015-12-14 20:55:22 +010073#include <net/6lowpan.h>
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +000074#include <net/firewire.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
Thomas Graf5d620262006-08-15 00:35:02 -070082#include <net/netlink.h>
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -070083#include <net/pkt_sched.h>
David Ahernca254492015-10-12 11:47:10 -070084#include <net/l3mdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +000087#include <linux/netconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#include <linux/random.h>
Stephen Hemmingere21e8462010-03-20 16:09:01 -070089#include <linux/uaccess.h>
Herbert Xu7f7d9a62007-04-24 21:54:09 -070090#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040094#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
dingtianhongba3542e2013-08-17 10:27:04 +0800100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#else
dingtianhongba3542e2013-08-17 10:27:04 +0800102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
Thomas Graf18a31e12010-11-17 04:12:02 +0000106
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
Thomas Graf18a31e12010-11-17 04:12:02 +0000110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700115static inline s32 rfc3315_s14_backoff_init(s32 irt)
116{
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121}
122
123static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124{
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134}
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#ifdef CONFIG_SYSCTL
WANG Conga317a2f2014-07-25 15:25:09 -0700137static int addrconf_sysctl_register(struct inet6_dev *idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800138static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139#else
WANG Conga317a2f2014-07-25 15:25:09 -0700140static inline int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800141{
WANG Conga317a2f2014-07-25 15:25:09 -0700142 return 0;
Pavel Emelyanov408c4762008-01-10 17:41:21 -0800143}
144
145static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146{
147}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148#endif
149
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200150static void ipv6_regen_rndid(struct inet6_dev *idev);
151static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900153static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static int ipv6_count_addresses(struct inet6_dev *idev);
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +0100155static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159/*
160 * Configured unicast address hash table
161 */
stephen hemmingerc2e21292010-03-17 20:31:10 +0000162static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
stephen hemminger5c578aed2010-03-17 20:31:11 +0000163static DEFINE_SPINLOCK(addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100165static void addrconf_verify(void);
166static void addrconf_verify_rtnl(void);
167static void addrconf_verify_work(struct work_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100169static struct workqueue_struct *addrconf_wq;
170static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
Jiri Pirko93d9b7d2010-03-10 10:28:56 +0000175static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static int addrconf_ifdown(struct net_device *dev, int how);
178
Romain Kuntz21caa662013-01-09 21:06:03 +0000179static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
David S. Millercf22f9a2012-04-14 21:37:40 -0400184static void addrconf_dad_start(struct inet6_ifaddr *ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100185static void addrconf_dad_work(struct work_struct *w);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900187static void addrconf_dad_run(struct inet6_dev *idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static void addrconf_rs_timer(unsigned long data);
189static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct prefix_info *pinfo);
David S. Miller3e81c6d2010-03-20 16:18:00 -0700194static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Adrian Bunk888c8482008-07-22 14:21:58 -0700197static struct ipv6_devconf ipv6_devconf __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Ian Morris67ba4152014-08-24 21:53:10 +0100212 .use_tempaddr = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800218 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700219 .accept_ra_from_local = 0,
Hangbin Liu8013d1d72015-07-30 14:28:42 +0800220 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800221 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800224 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800228#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700229 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700230 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900231 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900232 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200233 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700234 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100235 .stable_secret = {
236 .initialized = false,
Erik Kline3985e8a2015-07-22 16:38:25 +0900237 },
238 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400239 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800240 .keep_addr_on_down = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241};
242
Brian Haleyab32ea52006-09-22 14:15:41 -0700243static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +0200250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -0700256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_max_retry = REGEN_MAX_RETRY,
262 .max_desync_factor = MAX_DESYNC_FACTOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 .max_addresses = IPV6_MAX_ADDRESSES,
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -0800264 .accept_ra_defrtr = 1,
Ben Greeard9333192014-06-25 14:44:53 -0700265 .accept_ra_from_local = 0,
Hangbin Liu8013d1d72015-07-30 14:28:42 +0800266 .accept_ra_min_hop_limit= 1,
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -0800267 .accept_ra_pinfo = 1,
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800268#ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
YOSHIFUJI Hideaki52e163562006-03-20 17:05:47 -0800270 .rtr_probe_interval = 60 * HZ,
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -0800271#ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_max_plen = 0,
273#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -0800274#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -0700275 .proxy_ndp = 0,
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -0700276 .accept_source_route = 0, /* we do not accept RH0 by default. */
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +0900277 .disable_ipv6 = 0,
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900278 .accept_dad = 1,
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +0200279 .suppress_frag_ndisc = 1,
Harout Hedeshianc2943f12015-01-20 10:06:05 -0700280 .accept_ra_mtu = 1,
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +0100281 .stable_secret = {
282 .initialized = false,
283 },
Erik Kline3985e8a2015-07-22 16:38:25 +0900284 .use_oif_addrs_only = 0,
Andy Gospodarek35103d12015-08-13 10:39:01 -0400285 .ignore_routes_with_linkdown = 0,
David Ahernf1705ec2016-02-24 09:25:37 -0800286 .keep_addr_on_down = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287};
288
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700289/* Check if a valid qdisc is available */
David S. Miller05297942008-07-08 23:01:27 -0700290static inline bool addrconf_qdisc_ok(const struct net_device *dev)
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700291{
David S. Miller05297942008-07-08 23:01:27 -0700292 return !qdisc_tx_is_noop(dev);
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700293}
294
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200295static void addrconf_del_rs_timer(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200297 if (del_timer(&idev->rs_timer))
298 __in6_dev_put(idev);
299}
300
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100301static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200302{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100303 if (cancel_delayed_work(&ifp->dad_work))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 __in6_ifa_put(ifp);
305}
306
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200307static void addrconf_mod_rs_timer(struct inet6_dev *idev,
308 unsigned long when)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200310 if (!timer_pending(&idev->rs_timer))
311 in6_dev_hold(idev);
312 mod_timer(&idev->rs_timer, jiffies + when);
313}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100315static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
316 unsigned long delay)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200317{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100318 if (!delayed_work_pending(&ifp->dad_work))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200319 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100320 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321}
322
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700323static int snmp6_alloc_dev(struct inet6_dev *idev)
324{
John Stultz827da442013-10-07 15:51:58 -0700325 int i;
326
WANG Cong698365f2014-05-05 15:55:55 -0700327 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
328 if (!idev->stats.ipv6)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700329 goto err_ip;
John Stultz827da442013-10-07 15:51:58 -0700330
331 for_each_possible_cpu(i) {
332 struct ipstats_mib *addrconf_stats;
WANG Cong698365f2014-05-05 15:55:55 -0700333 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
John Stultz827da442013-10-07 15:51:58 -0700334 u64_stats_init(&addrconf_stats->syncp);
John Stultz827da442013-10-07 15:51:58 -0700335 }
336
337
Eric Dumazetbe281e52011-05-19 01:14:23 +0000338 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
339 GFP_KERNEL);
340 if (!idev->stats.icmpv6dev)
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700341 goto err_icmp;
Eric Dumazetbe281e52011-05-19 01:14:23 +0000342 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
343 GFP_KERNEL);
344 if (!idev->stats.icmpv6msgdev)
David L Stevens14878f72007-09-16 16:52:35 -0700345 goto err_icmpmsg;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700346
347 return 0;
348
David L Stevens14878f72007-09-16 16:52:35 -0700349err_icmpmsg:
Eric Dumazetbe281e52011-05-19 01:14:23 +0000350 kfree(idev->stats.icmpv6dev);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700351err_icmp:
WANG Cong698365f2014-05-05 15:55:55 -0700352 free_percpu(idev->stats.ipv6);
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700353err_ip:
Pavel Emelyanovaaf70ec2007-10-17 21:25:32 -0700354 return -ENOMEM;
Herbert Xu7f7d9a62007-04-24 21:54:09 -0700355}
356
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000357static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
359 struct inet6_dev *ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700360 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 ASSERT_RTNL();
363
364 if (dev->mtu < IPV6_MIN_MTU)
WANG Conga317a2f2014-07-25 15:25:09 -0700365 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900367 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100368 if (!ndev)
WANG Conga317a2f2014-07-25 15:25:09 -0700369 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Ingo Oeser322f74a2006-03-20 23:01:47 -0800371 rwlock_init(&ndev->lock);
372 ndev->dev = dev;
stephen hemminger502a2ff2010-03-17 20:31:13 +0000373 INIT_LIST_HEAD(&ndev->addr_list);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +0200374 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
375 (unsigned long)ndev);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900376 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
Hannes Frederic Sowa9b29c692015-12-15 22:59:12 +0100377
378 if (ndev->cnf.stable_secret.initialized)
379 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
380 else
381 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
382
Ingo Oeser322f74a2006-03-20 23:01:47 -0800383 ndev->cnf.mtu6 = dev->mtu;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800384 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
Ian Morris63159f22015-03-29 14:00:04 +0100385 if (!ndev->nd_parms) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800386 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700387 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800388 }
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700389 if (ndev->cnf.forwarding)
390 dev_disable_lro(dev);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800391 /* We refer to the device */
392 dev_hold(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Ingo Oeser322f74a2006-03-20 23:01:47 -0800394 if (snmp6_alloc_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800395 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000396 "%s: cannot allocate memory for statistics; dev=%s.\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800397 __func__, dev->name);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800398 neigh_parms_release(&nd_tbl, ndev->nd_parms);
Roy Li8603e332011-09-20 15:10:16 -0400399 dev_put(dev);
400 kfree(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700401 return ERR_PTR(err);
Ingo Oeser322f74a2006-03-20 23:01:47 -0800402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Ingo Oeser322f74a2006-03-20 23:01:47 -0800404 if (snmp6_register_dev(ndev) < 0) {
dingtianhongba3542e2013-08-17 10:27:04 +0800405 ADBG(KERN_WARNING
Joe Perchesf3213832012-05-15 14:11:53 +0000406 "%s: cannot create /proc/net/dev_snmp6/%s\n",
dingtianhongba3542e2013-08-17 10:27:04 +0800407 __func__, dev->name);
WANG Conga317a2f2014-07-25 15:25:09 -0700408 goto err_release;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200411 /* One reference from device. */
Ingo Oeser322f74a2006-03-20 23:01:47 -0800412 in6_dev_hold(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +0900414 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
415 ndev->cnf.accept_dad = -1;
416
Amerigo Wang07a93622012-10-29 16:23:10 +0000417#if IS_ENABLED(CONFIG_IPV6_SIT)
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700418 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
Joe Perchesf3213832012-05-15 14:11:53 +0000419 pr_info("%s: Disabled Multicast RS\n", dev->name);
YOSHIFUJI Hideakib077d7a2008-04-13 23:42:18 -0700420 ndev->cnf.rtr_solicits = 0;
421 }
422#endif
423
stephen hemminger372e6c82010-03-17 20:31:09 +0000424 INIT_LIST_HEAD(&ndev->tempaddr_list);
Jiri Bohac76506a92016-10-13 18:52:15 +0200425 ndev->desync_factor = U32_MAX;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800426 if ((dev->flags&IFF_LOOPBACK) ||
427 dev->type == ARPHRD_TUNNEL ||
YOSHIFUJI Hideaki9625ed72008-04-13 23:47:11 -0700428 dev->type == ARPHRD_TUNNEL6 ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700429 dev->type == ARPHRD_SIT ||
Joerg Roedel0be669b2006-10-10 14:49:53 -0700430 dev->type == ARPHRD_NONE) {
Ingo Oeser322f74a2006-03-20 23:01:47 -0800431 ndev->cnf.use_tempaddr = -1;
Jiri Bohac9d6280d2016-10-13 18:50:02 +0200432 } else
433 ipv6_regen_rndid(ndev);
David S. Miller5d9efa72013-10-28 20:07:50 -0400434
Daniel Borkmann914faa12013-04-09 03:47:14 +0000435 ndev->token = in6addr_any;
Ingo Oeser322f74a2006-03-20 23:01:47 -0800436
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -0700437 if (netif_running(dev) && addrconf_qdisc_ok(dev))
Herbert Xu53aadcc2007-03-27 14:31:52 -0700438 ndev->if_flags |= IF_READY;
439
Ingo Oeser322f74a2006-03-20 23:01:47 -0800440 ipv6_mc_init_dev(ndev);
441 ndev->tstamp = jiffies;
WANG Conga317a2f2014-07-25 15:25:09 -0700442 err = addrconf_sysctl_register(ndev);
443 if (err) {
444 ipv6_mc_destroy_dev(ndev);
Sabrina Dubroca2a189f9e2015-11-04 14:47:53 +0100445 snmp6_unregister_dev(ndev);
WANG Conga317a2f2014-07-25 15:25:09 -0700446 goto err_release;
447 }
David L Stevens30c4cf52007-01-04 12:31:14 -0800448 /* protected by rtnl_lock */
Eric Dumazetcf778b02012-01-12 04:41:32 +0000449 rcu_assign_pointer(dev->ip6_ptr, ndev);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800450
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000451 /* Join interface-local all-node multicast group */
452 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
453
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800454 /* Join all-node multicast group */
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900455 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
YOSHIFUJI Hideakid88ae4c2007-01-14 21:48:40 -0800456
Li Weid6ddef92012-03-05 14:45:17 +0000457 /* Join all-router multicast group if forwarding is set */
Li Wei8b2aaed2012-03-07 14:58:07 +0000458 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
Li Weid6ddef92012-03-05 14:45:17 +0000459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 return ndev;
WANG Conga317a2f2014-07-25 15:25:09 -0700462
463err_release:
464 neigh_parms_release(&nd_tbl, ndev->nd_parms);
465 ndev->dead = 1;
466 in6_dev_finish_destroy(ndev);
467 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
Eldad Zack8e5e8f32012-04-01 07:49:08 +0000470static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 struct inet6_dev *idev;
473
474 ASSERT_RTNL();
475
Stephen Hemmingere21e8462010-03-20 16:09:01 -0700476 idev = __in6_dev_get(dev);
477 if (!idev) {
478 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -0700479 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 return NULL;
481 }
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +0900482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (dev->flags&IFF_UP)
484 ipv6_mc_up(idev);
485 return idev;
486}
487
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000488static int inet6_netconf_msgsize_devconf(int type)
489{
490 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
491 + nla_total_size(4); /* NETCONFA_IFINDEX */
Zhang Shengju136ba622016-03-10 08:55:50 +0000492 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000493
Zhang Shengju136ba622016-03-10 08:55:50 +0000494 if (type == NETCONFA_ALL)
495 all = true;
496
497 if (all || type == NETCONFA_FORWARDING)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000498 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500499#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000500 if (all || type == NETCONFA_MC_FORWARDING)
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000501 size += nla_total_size(4);
David S. Millerb1afce92012-12-04 14:46:34 -0500502#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000503 if (all || type == NETCONFA_PROXY_NEIGH)
stephen hemmingerc92d5492013-12-17 22:37:14 -0800504 size += nla_total_size(4);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000505
Zhang Shengju136ba622016-03-10 08:55:50 +0000506 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
Andy Gospodarek35103d12015-08-13 10:39:01 -0400507 size += nla_total_size(4);
508
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000509 return size;
510}
511
512static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
513 struct ipv6_devconf *devconf, u32 portid,
514 u32 seq, int event, unsigned int flags,
515 int type)
516{
517 struct nlmsghdr *nlh;
518 struct netconfmsg *ncm;
Zhang Shengju136ba622016-03-10 08:55:50 +0000519 bool all = false;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000520
521 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
522 flags);
Ian Morris63159f22015-03-29 14:00:04 +0100523 if (!nlh)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000524 return -EMSGSIZE;
525
Zhang Shengju136ba622016-03-10 08:55:50 +0000526 if (type == NETCONFA_ALL)
527 all = true;
528
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000529 ncm = nlmsg_data(nlh);
530 ncm->ncm_family = AF_INET6;
531
532 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
533 goto nla_put_failure;
534
Zhang Shengju136ba622016-03-10 08:55:50 +0000535 if ((all || type == NETCONFA_FORWARDING) &&
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000536 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
537 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500538#ifdef CONFIG_IPV6_MROUTE
Zhang Shengju136ba622016-03-10 08:55:50 +0000539 if ((all || type == NETCONFA_MC_FORWARDING) &&
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000540 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
541 devconf->mc_forwarding) < 0)
542 goto nla_put_failure;
David S. Millerb1afce92012-12-04 14:46:34 -0500543#endif
Zhang Shengju136ba622016-03-10 08:55:50 +0000544 if ((all || type == NETCONFA_PROXY_NEIGH) &&
stephen hemmingerc92d5492013-12-17 22:37:14 -0800545 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
546 goto nla_put_failure;
547
Zhang Shengju136ba622016-03-10 08:55:50 +0000548 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
Andy Gospodarek35103d12015-08-13 10:39:01 -0400549 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
550 devconf->ignore_routes_with_linkdown) < 0)
551 goto nla_put_failure;
552
Johannes Berg053c0952015-01-16 22:09:00 +0100553 nlmsg_end(skb, nlh);
554 return 0;
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000555
556nla_put_failure:
557 nlmsg_cancel(skb, nlh);
558 return -EMSGSIZE;
559}
560
Nicolas Dichteld67b8c62012-12-04 01:13:35 +0000561void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
562 struct ipv6_devconf *devconf)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000563{
564 struct sk_buff *skb;
565 int err = -ENOBUFS;
566
Eric Dumazet927265b2016-07-08 05:46:04 +0200567 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +0100568 if (!skb)
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000569 goto errout;
570
571 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
572 RTM_NEWNETCONF, 0, type);
573 if (err < 0) {
574 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
575 WARN_ON(err == -EMSGSIZE);
576 kfree_skb(skb);
577 goto errout;
578 }
Eric Dumazet927265b2016-07-08 05:46:04 +0200579 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000580 return;
581errout:
Cong Dingbd779022012-12-18 12:08:56 +0000582 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000583}
584
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000585static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
586 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
587 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
stephen hemmingerc92d5492013-12-17 22:37:14 -0800588 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
Andy Gospodarek35103d12015-08-13 10:39:01 -0400589 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000590};
591
592static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
Thomas Graf661d2962013-03-21 07:45:29 +0000593 struct nlmsghdr *nlh)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000594{
595 struct net *net = sock_net(in_skb->sk);
596 struct nlattr *tb[NETCONFA_MAX+1];
597 struct netconfmsg *ncm;
598 struct sk_buff *skb;
599 struct ipv6_devconf *devconf;
600 struct inet6_dev *in6_dev;
601 struct net_device *dev;
602 int ifindex;
603 int err;
604
605 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
606 devconf_ipv6_policy);
607 if (err < 0)
608 goto errout;
609
Anton Protopopova97eb332016-02-16 21:43:16 -0500610 err = -EINVAL;
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000611 if (!tb[NETCONFA_IFINDEX])
612 goto errout;
613
614 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
615 switch (ifindex) {
616 case NETCONFA_IFINDEX_ALL:
617 devconf = net->ipv6.devconf_all;
618 break;
619 case NETCONFA_IFINDEX_DEFAULT:
620 devconf = net->ipv6.devconf_dflt;
621 break;
622 default:
623 dev = __dev_get_by_index(net, ifindex);
Ian Morris63159f22015-03-29 14:00:04 +0100624 if (!dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000625 goto errout;
626 in6_dev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +0100627 if (!in6_dev)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000628 goto errout;
629 devconf = &in6_dev->cnf;
630 break;
631 }
632
633 err = -ENOBUFS;
Zhang Shengju136ba622016-03-10 08:55:50 +0000634 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +0100635 if (!skb)
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000636 goto errout;
637
638 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
639 NETLINK_CB(in_skb).portid,
640 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
Zhang Shengju136ba622016-03-10 08:55:50 +0000641 NETCONFA_ALL);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +0000642 if (err < 0) {
643 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
644 WARN_ON(err == -EMSGSIZE);
645 kfree_skb(skb);
646 goto errout;
647 }
648 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
649errout:
650 return err;
651}
652
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000653static int inet6_netconf_dump_devconf(struct sk_buff *skb,
654 struct netlink_callback *cb)
655{
656 struct net *net = sock_net(skb->sk);
657 int h, s_h;
658 int idx, s_idx;
659 struct net_device *dev;
660 struct inet6_dev *idev;
661 struct hlist_head *head;
662
663 s_h = cb->args[0];
664 s_idx = idx = cb->args[1];
665
666 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
667 idx = 0;
668 head = &net->dev_index_head[h];
669 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000670 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
671 net->dev_base_seq;
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000672 hlist_for_each_entry_rcu(dev, head, index_hlist) {
673 if (idx < s_idx)
674 goto cont;
675 idev = __in6_dev_get(dev);
676 if (!idev)
677 goto cont;
678
679 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
680 &idev->cnf,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF,
684 NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000685 NETCONFA_ALL) < 0) {
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000686 rcu_read_unlock();
687 goto done;
688 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +0000689 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000690cont:
691 idx++;
692 }
693 rcu_read_unlock();
694 }
695 if (h == NETDEV_HASHENTRIES) {
696 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
697 net->ipv6.devconf_all,
698 NETLINK_CB(cb->skb).portid,
699 cb->nlh->nlmsg_seq,
700 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000701 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000702 goto done;
703 else
704 h++;
705 }
706 if (h == NETDEV_HASHENTRIES + 1) {
707 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
708 net->ipv6.devconf_dflt,
709 NETLINK_CB(cb->skb).portid,
710 cb->nlh->nlmsg_seq,
711 RTM_NEWNETCONF, NLM_F_MULTI,
Zhang Shengju136ba622016-03-10 08:55:50 +0000712 NETCONFA_ALL) < 0)
Nicolas Dichtel7a674202013-03-05 23:42:06 +0000713 goto done;
714 else
715 h++;
716 }
717done:
718 cb->args[0] = h;
719 cb->args[1] = idx;
720
721 return skb->len;
722}
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724#ifdef CONFIG_SYSCTL
725static void dev_forward_change(struct inet6_dev *idev)
726{
727 struct net_device *dev;
728 struct inet6_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730 if (!idev)
731 return;
732 dev = idev->dev;
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700733 if (idev->cnf.forwarding)
734 dev_disable_lro(dev);
Amerigo Wang1a940832012-10-28 17:43:53 +0000735 if (dev->flags & IFF_MULTICAST) {
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000736 if (idev->cnf.forwarding) {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900737 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000738 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
739 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
740 } else {
YOSHIFUJI Hideakif3ee4012008-04-10 15:42:11 +0900741 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
Hannes Frederic Sowa2c5e8932013-02-10 03:50:18 +0000742 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
743 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
744 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 }
stephen hemminger502a2ff2010-03-17 20:31:13 +0000746
747 list_for_each_entry(ifa, &idev->addr_list, if_list) {
Michal Wrobel2c12a742007-02-26 15:36:10 -0800748 if (ifa->flags&IFA_F_TENTATIVE)
749 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 if (idev->cnf.forwarding)
751 addrconf_join_anycast(ifa);
752 else
753 addrconf_leave_anycast(ifa);
754 }
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000755 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
756 dev->ifindex, &idev->cnf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757}
758
759
Pavel Emelyanove1869322008-01-10 17:43:50 -0800760static void addrconf_forward_change(struct net *net, __s32 newf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 struct net_device *dev;
763 struct inet6_dev *idev;
764
Ben Hutchings4acd4942012-08-14 08:54:51 +0000765 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 idev = __in6_dev_get(dev);
767 if (idev) {
Pavel Emelyanove1869322008-01-10 17:43:50 -0800768 int changed = (!idev->cnf.forwarding) ^ (!newf);
769 idev->cnf.forwarding = newf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (changed)
771 dev_forward_change(idev);
772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800775
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000776static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800777{
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800778 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000779 int old;
780
781 if (!rtnl_trylock())
782 return restart_syscall();
Pavel Emelyanovbff16c22008-01-10 17:42:13 -0800783
784 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000785 old = *p;
786 *p = newf;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800787
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000788 if (p == &net->ipv6.devconf_dflt->forwarding) {
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000789 if ((!newf) ^ (!old))
790 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
791 NETCONFA_IFINDEX_DEFAULT,
792 net->ipv6.devconf_dflt);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000793 rtnl_unlock();
794 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +0000795 }
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000796
Pavel Emelyanove1869322008-01-10 17:43:50 -0800797 if (p == &net->ipv6.devconf_all->forwarding) {
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200798 int old_dflt = net->ipv6.devconf_dflt->forwarding;
799
Pavel Emelyanove1869322008-01-10 17:43:50 -0800800 net->ipv6.devconf_dflt->forwarding = newf;
Nicolas Dichteld26c6382016-08-30 10:09:21 +0200801 if ((!newf) ^ (!old_dflt))
802 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
803 NETCONFA_IFINDEX_DEFAULT,
804 net->ipv6.devconf_dflt);
805
Pavel Emelyanove1869322008-01-10 17:43:50 -0800806 addrconf_forward_change(net, newf);
Nicolas Dichtelf3a1bfb2012-10-25 22:28:50 +0000807 if ((!newf) ^ (!old))
808 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
809 NETCONFA_IFINDEX_ALL,
810 net->ipv6.devconf_all);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000811 } else if ((!newf) ^ (!old))
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800812 dev_forward_change((struct inet6_dev *)table->extra1);
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700813 rtnl_unlock();
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800814
Francesco Ruggeri013d97e2012-01-16 10:40:10 +0000815 if (newf)
Daniel Lezcano7b4da532008-03-04 13:47:14 -0800816 rt6_purge_dflt_routers(net);
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +0000817 return 1;
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -0800818}
Andy Gospodarek35103d12015-08-13 10:39:01 -0400819
820static void addrconf_linkdown_change(struct net *net, __s32 newf)
821{
822 struct net_device *dev;
823 struct inet6_dev *idev;
824
825 for_each_netdev(net, dev) {
826 idev = __in6_dev_get(dev);
827 if (idev) {
828 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
829
830 idev->cnf.ignore_routes_with_linkdown = newf;
831 if (changed)
832 inet6_netconf_notify_devconf(dev_net(dev),
833 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
834 dev->ifindex,
835 &idev->cnf);
836 }
837 }
838}
839
840static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
841{
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net,
855 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
863 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
864 addrconf_linkdown_change(net, newf);
865 if ((!newf) ^ (!old))
866 inet6_netconf_notify_devconf(net,
867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 NETCONFA_IFINDEX_ALL,
869 net->ipv6.devconf_all);
870 }
871 rtnl_unlock();
872
873 return 1;
874}
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876#endif
877
stephen hemminger5c578aed2010-03-17 20:31:11 +0000878/* Nobody refers to this ifaddr, destroy it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
880{
stephen hemmingerc2e21292010-03-17 20:31:10 +0000881 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883#ifdef NET_REFCNT_DEBUG
Joe Perches91df42b2012-05-15 14:11:54 +0000884 pr_debug("%s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885#endif
886
887 in6_dev_put(ifp->idev);
888
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100889 if (cancel_delayed_work(&ifp->dad_work))
890 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
891 ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Herbert Xue9d3e082010-05-18 15:36:06 -0700893 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
Joe Perchesf3213832012-05-15 14:11:53 +0000894 pr_warn("Freeing alive inet6 address %p\n", ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 return;
896 }
Amerigo Wang94e187c2012-10-29 00:13:19 +0000897 ip6_rt_put(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Lai Jiangshane5785982011-03-15 18:00:14 +0800899 kfree_rcu(ifp, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900}
901
Brian Haleye55ffac2006-07-10 15:25:51 -0700902static void
903ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
904{
stephen hemminger502a2ff2010-03-17 20:31:13 +0000905 struct list_head *p;
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700906 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
Brian Haleye55ffac2006-07-10 15:25:51 -0700907
908 /*
909 * Each device address list is sorted in order of scope -
910 * global before linklocal.
911 */
stephen hemminger502a2ff2010-03-17 20:31:13 +0000912 list_for_each(p, &idev->addr_list) {
913 struct inet6_ifaddr *ifa
914 = list_entry(p, struct inet6_ifaddr, if_list);
YOSHIFUJI Hideaki8a6ce0c2006-07-11 13:05:30 -0700915 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
Brian Haleye55ffac2006-07-10 15:25:51 -0700916 break;
917 }
918
David S. Millerb54c9b92010-03-25 21:25:30 -0700919 list_add_tail(&ifp->if_list, p);
Brian Haleye55ffac2006-07-10 15:25:51 -0700920}
921
Eric Dumazetddbe5032012-07-18 08:11:12 +0000922static u32 inet6_addr_hash(const struct in6_addr *addr)
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900923{
Eric Dumazetddbe5032012-07-18 08:11:12 +0000924 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
YOSHIFUJI Hideaki3eb84f42008-04-10 15:42:08 +0900925}
926
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927/* On success it returns ifp with increased reference count */
928
929static struct inet6_ifaddr *
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200930ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
931 const struct in6_addr *peer_addr, int pfxlen,
Jiri Benc8a226b22013-08-01 10:41:28 +0200932 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933{
934 struct inet6_ifaddr *ifa = NULL;
935 struct rt6_info *rt;
stephen hemminger3a88a812010-03-17 20:31:12 +0000936 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 int err = 0;
YOSHIFUJI Hideakid68b8272008-06-25 16:26:47 +0900938 int addr_type = ipv6_addr_type(addr);
939
940 if (addr_type == IPV6_ADDR_ANY ||
941 addr_type & IPV6_ADDR_MULTICAST ||
942 (!(idev->dev->flags & IFF_LOOPBACK) &&
943 addr_type & IPV6_ADDR_LOOPBACK))
944 return ERR_PTR(-EADDRNOTAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700946 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 if (idev->dead) {
948 err = -ENODEV; /*XXX*/
949 goto out2;
950 }
951
Brian Haley56d417b2009-06-01 03:07:33 -0700952 if (idev->cnf.disable_ipv6) {
Brian Haley9bdd8d42009-03-18 18:22:48 -0700953 err = -EACCES;
954 goto out2;
955 }
956
stephen hemminger5c578aed2010-03-17 20:31:11 +0000957 spin_lock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 /* Ignore adding duplicate addresses on an interface */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900960 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
dingtianhongba3542e2013-08-17 10:27:04 +0800961 ADBG("ipv6_add_addr: already assigned\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 err = -EEXIST;
963 goto out;
964 }
965
Ingo Oeser322f74a2006-03-20 23:01:47 -0800966 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Ian Morris63159f22015-03-29 14:00:04 +0100968 if (!ifa) {
dingtianhongba3542e2013-08-17 10:27:04 +0800969 ADBG("ipv6_add_addr: malloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 err = -ENOBUFS;
971 goto out;
972 }
973
David S. Miller8f031512011-12-06 16:48:14 -0500974 rt = addrconf_dst_alloc(idev, addr, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 if (IS_ERR(rt)) {
976 err = PTR_ERR(rt);
977 goto out;
978 }
979
Jiri Pirkobba24892013-12-07 19:26:57 +0100980 neigh_parms_data_state_setall(idev->nd_parms);
981
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000982 ifa->addr = *addr;
Jiri Pirko3f8f5292013-08-01 10:41:27 +0200983 if (peer_addr)
984 ifa->peer_addr = *peer_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 spin_lock_init(&ifa->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +0100987 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
stephen hemmingerc2e21292010-03-17 20:31:10 +0000988 INIT_HLIST_NODE(&ifa->addr_lst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 ifa->scope = scope;
990 ifa->prefix_len = pfxlen;
991 ifa->flags = flags | IFA_F_TENTATIVE;
Jiri Benc8a226b22013-08-01 10:41:28 +0200992 ifa->valid_lft = valid_lft;
993 ifa->prefered_lft = prefered_lft;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 ifa->cstamp = ifa->tstamp = jiffies;
Daniel Borkmann617fe292013-04-09 03:47:16 +0000995 ifa->tokenized = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
Keir Fraser57f5f542006-08-29 02:43:49 -0700997 ifa->rt = rt;
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 ifa->idev = idev;
1000 in6_dev_hold(idev);
1001 /* For caller */
1002 in6_ifa_hold(ifa);
1003
1004 /* Add to big hash table */
Eric Dumazetddbe5032012-07-18 08:11:12 +00001005 hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
stephen hemminger5c578aed2010-03-17 20:31:11 +00001007 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001008 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
1010 write_lock(&idev->lock);
1011 /* Add to inet6_dev unicast addr list. */
Brian Haleye55ffac2006-07-10 15:25:51 -07001012 ipv6_link_dev_addr(idev, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 if (ifa->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001015 list_add(&ifa->tmp_list, &idev->tempaddr_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 in6_ifa_hold(ifa);
1017 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 in6_ifa_hold(ifa);
1020 write_unlock(&idev->lock);
1021out2:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001022 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
YOSHIFUJI Hideakifd928332005-04-19 22:27:09 -07001024 if (likely(err == 0))
Cong Wangf88c91d2013-04-14 23:18:43 +08001025 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 else {
1027 kfree(ifa);
1028 ifa = ERR_PTR(err);
1029 }
1030
1031 return ifa;
1032out:
stephen hemminger5c578aed2010-03-17 20:31:11 +00001033 spin_unlock(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 goto out2;
1035}
1036
Thomas Haller5b84efe2014-01-15 15:36:59 +01001037enum cleanup_prefix_rt_t {
1038 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1039 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1040 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1041};
1042
1043/*
1044 * Check, whether the prefix for ifp would still need a prefix route
1045 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1046 * constants.
1047 *
1048 * 1) we don't purge prefix if address was not permanent.
1049 * prefix is managed by its own lifetime.
1050 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1051 * 3) if there are no addresses, delete prefix.
1052 * 4) if there are still other permanent address(es),
1053 * corresponding prefix is still permanent.
1054 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1055 * don't purge the prefix, assume user space is managing it.
1056 * 6) otherwise, update prefix lifetime to the
1057 * longest valid lifetime among the corresponding
1058 * addresses on the device.
1059 * Note: subsequent RA will update lifetime.
1060 **/
1061static enum cleanup_prefix_rt_t
1062check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1063{
1064 struct inet6_ifaddr *ifa;
1065 struct inet6_dev *idev = ifp->idev;
1066 unsigned long lifetime;
1067 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1068
1069 *expires = jiffies;
1070
1071 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1072 if (ifa == ifp)
1073 continue;
1074 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1075 ifp->prefix_len))
1076 continue;
1077 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1078 return CLEANUP_PREFIX_RT_NOP;
1079
1080 action = CLEANUP_PREFIX_RT_EXPIRE;
1081
1082 spin_lock(&ifa->lock);
1083
1084 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1085 /*
1086 * Note: Because this address is
1087 * not permanent, lifetime <
1088 * LONG_MAX / HZ here.
1089 */
1090 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1091 *expires = ifa->tstamp + lifetime * HZ;
1092 spin_unlock(&ifa->lock);
1093 }
1094
1095 return action;
1096}
1097
1098static void
1099cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1100{
1101 struct rt6_info *rt;
1102
1103 rt = addrconf_get_prefix_route(&ifp->addr,
1104 ifp->prefix_len,
1105 ifp->idev->dev,
1106 0, RTF_GATEWAY | RTF_DEFAULT);
1107 if (rt) {
1108 if (del_rt)
1109 ip6_del_rt(rt);
1110 else {
1111 if (!(rt->rt6i_flags & RTF_EXPIRES))
1112 rt6_set_expires(rt, expires);
1113 ip6_rt_put(rt);
1114 }
1115 }
1116}
1117
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119/* This function wants to get referenced ifp and releases it before return */
1120
1121static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1122{
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001123 int state;
Thomas Haller5b84efe2014-01-15 15:36:59 +01001124 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1125 unsigned long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001127 ASSERT_RTNL();
1128
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001129 spin_lock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001130 state = ifp->state;
Herbert Xue9d3e082010-05-18 15:36:06 -07001131 ifp->state = INET6_IFADDR_STATE_DEAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001132 spin_unlock_bh(&ifp->lock);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001133
1134 if (state == INET6_IFADDR_STATE_DEAD)
1135 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
stephen hemminger5c578aed2010-03-17 20:31:11 +00001137 spin_lock_bh(&addrconf_hash_lock);
1138 hlist_del_init_rcu(&ifp->addr_lst);
stephen hemminger5c578aed2010-03-17 20:31:11 +00001139 spin_unlock_bh(&addrconf_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Thomas Haller5b84efe2014-01-15 15:36:59 +01001141 write_lock_bh(&ifp->idev->lock);
David S. Miller5d9efa72013-10-28 20:07:50 -04001142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 if (ifp->flags&IFA_F_TEMPORARY) {
stephen hemminger372e6c82010-03-17 20:31:09 +00001144 list_del(&ifp->tmp_list);
1145 if (ifp->ifpub) {
1146 in6_ifa_put(ifp->ifpub);
1147 ifp->ifpub = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 }
stephen hemminger372e6c82010-03-17 20:31:09 +00001149 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Thomas Haller5b84efe2014-01-15 15:36:59 +01001152 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1153 action = check_cleanup_prefix_route(ifp, &expires);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001154
Thomas Haller5b84efe2014-01-15 15:36:59 +01001155 list_del_init(&ifp->if_list);
1156 __in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Thomas Haller5b84efe2014-01-15 15:36:59 +01001158 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001160 addrconf_del_dad_work(ifp);
Andrey Vaginb2238562008-07-08 15:13:31 -07001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 ipv6_ifa_notify(RTM_DELADDR, ifp);
1163
Cong Wangf88c91d2013-04-14 23:18:43 +08001164 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
Thomas Haller5b84efe2014-01-15 15:36:59 +01001166 if (action != CLEANUP_PREFIX_RT_NOP) {
1167 cleanup_prefix_route(ifp, expires,
1168 action == CLEANUP_PREFIX_RT_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 }
1170
Daniel Walterc3968a82011-04-13 21:10:57 +00001171 /* clean up prefsrc entries */
1172 rt6_remove_prefsrc(ifp);
Herbert Xu4c5ff6a2010-05-18 15:54:18 -07001173out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 in6_ifa_put(ifp);
1175}
1176
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1178{
1179 struct inet6_dev *idev = ifp->idev;
1180 struct in6_addr addr, *tmpaddr;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001181 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001182 unsigned long regen_advance;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 int tmp_plen;
1184 int ret = 0;
Neil Horman95c385b2007-04-25 17:08:10 -07001185 u32 addr_flags;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001186 unsigned long now = jiffies;
Jiri Bohac76506a92016-10-13 18:52:15 +02001187 long max_desync_factor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
Jiri Pirko53bd6742013-12-06 09:45:22 +01001189 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (ift) {
1191 spin_lock_bh(&ift->lock);
1192 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1193 spin_unlock_bh(&ift->lock);
1194 tmpaddr = &addr;
1195 } else {
1196 tmpaddr = NULL;
1197 }
1198retry:
1199 in6_dev_hold(idev);
1200 if (idev->cnf.use_tempaddr <= 0) {
Jiri Pirko53bd6742013-12-06 09:45:22 +01001201 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001202 pr_info("%s: use_tempaddr is disabled\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 in6_dev_put(idev);
1204 ret = -1;
1205 goto out;
1206 }
1207 spin_lock_bh(&ifp->lock);
1208 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1209 idev->cnf.use_tempaddr = -1; /*XXX*/
1210 spin_unlock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01001211 write_unlock_bh(&idev->lock);
Joe Perchesf3213832012-05-15 14:11:53 +00001212 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1213 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 in6_dev_put(idev);
1215 ret = -1;
1216 goto out;
1217 }
1218 in6_ifa_hold(ifp);
1219 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
Jiri Bohac9d6280d2016-10-13 18:50:02 +02001220 ipv6_try_regen_rndid(idev, tmpaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 memcpy(&addr.s6_addr[8], idev->rndid, 8);
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001222 age = (now - ifp->tstamp) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001224 regen_advance = idev->cnf.regen_max_retry *
Ian Morris67ba4152014-08-24 21:53:10 +01001225 idev->cnf.dad_transmits *
1226 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
Jiri Bohac76506a92016-10-13 18:52:15 +02001227
1228 /* recalculate max_desync_factor each time and update
1229 * idev->desync_factor if it's larger
1230 */
1231 max_desync_factor = min_t(__u32,
1232 idev->cnf.max_desync_factor,
1233 idev->cnf.temp_prefered_lft - regen_advance);
1234
1235 if (unlikely(idev->desync_factor > max_desync_factor)) {
1236 if (max_desync_factor > 0) {
1237 get_random_bytes(&idev->desync_factor,
1238 sizeof(idev->desync_factor));
1239 idev->desync_factor %= max_desync_factor;
1240 } else {
1241 idev->desync_factor = 0;
1242 }
1243 }
1244
1245 tmp_valid_lft = min_t(__u32,
1246 ifp->valid_lft,
1247 idev->cnf.temp_valid_lft + age);
1248 tmp_prefered_lft = idev->cnf.temp_prefered_lft + age -
1249 idev->desync_factor;
1250 /* guard against underflow in case of concurrent updates to cnf */
1251 if (unlikely(tmp_prefered_lft < 0))
1252 tmp_prefered_lft = 0;
1253 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1254 tmp_plen = ifp->prefix_len;
1255 tmp_tstamp = ifp->tstamp;
1256 spin_unlock_bh(&ifp->lock);
1257
Jiri Pirko53bd6742013-12-06 09:45:22 +01001258 write_unlock_bh(&idev->lock);
Neil Horman95c385b2007-04-25 17:08:10 -07001259
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001260 /* A temporary address is created only if this calculated Preferred
1261 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1262 * an implementation must not create a temporary address with a zero
1263 * Preferred Lifetime.
Heiner Kallweitecab6702014-03-12 22:13:19 +01001264 * Use age calculation as in addrconf_verify to avoid unnecessary
1265 * temporary addresses being generated.
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001266 */
Heiner Kallweitecab6702014-03-12 22:13:19 +01001267 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1268 if (tmp_prefered_lft <= regen_advance + age) {
Benoit Boissinoteac55bf2008-04-02 00:01:35 -07001269 in6_ifa_put(ifp);
1270 in6_dev_put(idev);
1271 ret = -1;
1272 goto out;
1273 }
1274
Neil Horman95c385b2007-04-25 17:08:10 -07001275 addr_flags = IFA_F_TEMPORARY;
1276 /* set in addrconf_prefix_rcv() */
1277 if (ifp->flags & IFA_F_OPTIMISTIC)
1278 addr_flags |= IFA_F_OPTIMISTIC;
1279
Hannes Frederic Sowa4b08a8f2013-08-16 13:02:27 +02001280 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1281 ipv6_addr_scope(&addr), addr_flags,
1282 tmp_valid_lft, tmp_prefered_lft);
1283 if (IS_ERR(ift)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 in6_ifa_put(ifp);
1285 in6_dev_put(idev);
Joe Perchesf3213832012-05-15 14:11:53 +00001286 pr_info("%s: retry temporary address regeneration\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 tmpaddr = &addr;
Jiri Pirko53bd6742013-12-06 09:45:22 +01001288 write_lock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 goto retry;
1290 }
1291
1292 spin_lock_bh(&ift->lock);
1293 ift->ifpub = ifp;
Lorenzo Colitti76f793e2011-07-26 13:50:49 +00001294 ift->cstamp = now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 ift->tstamp = tmp_tstamp;
1296 spin_unlock_bh(&ift->lock);
1297
David S. Millercf22f9a2012-04-14 21:37:40 -04001298 addrconf_dad_start(ift);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 in6_ifa_put(ift);
1300 in6_dev_put(idev);
1301out:
1302 return ret;
1303}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
1305/*
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001306 * Choose an appropriate source address (RFC3484)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 */
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001308enum {
1309 IPV6_SADDR_RULE_INIT = 0,
1310 IPV6_SADDR_RULE_LOCAL,
1311 IPV6_SADDR_RULE_SCOPE,
1312 IPV6_SADDR_RULE_PREFERRED,
1313#ifdef CONFIG_IPV6_MIP6
1314 IPV6_SADDR_RULE_HOA,
1315#endif
1316 IPV6_SADDR_RULE_OIF,
1317 IPV6_SADDR_RULE_LABEL,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001318 IPV6_SADDR_RULE_PRIVACY,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001319 IPV6_SADDR_RULE_ORCHID,
1320 IPV6_SADDR_RULE_PREFIX,
Erik Kline7fd25612014-10-28 18:11:14 +09001321#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1322 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1323#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001324 IPV6_SADDR_RULE_MAX
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001325};
1326
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001327struct ipv6_saddr_score {
1328 int rule;
1329 int addr_type;
1330 struct inet6_ifaddr *ifa;
1331 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1332 int scopedist;
1333 int matchlen;
1334};
1335
1336struct ipv6_saddr_dst {
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001337 const struct in6_addr *addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001338 int ifindex;
1339 int scope;
1340 int label;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001341 unsigned int prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001342};
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001343
Dave Jonesb6f99a22007-03-22 12:27:49 -07001344static inline int ipv6_saddr_preferred(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345{
Ulrich Weber45bb00602010-02-25 23:28:58 +00001346 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001347 return 1;
1348 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349}
1350
Erik Kline7fd25612014-10-28 18:11:14 +09001351static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1352{
1353#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1354 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1355#else
1356 return false;
1357#endif
1358}
1359
Benjamin Thery3de23252008-05-28 14:51:24 +02001360static int ipv6_get_saddr_eval(struct net *net,
1361 struct ipv6_saddr_score *score,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001362 struct ipv6_saddr_dst *dst,
1363 int i)
1364{
1365 int ret;
1366
1367 if (i <= score->rule) {
1368 switch (i) {
1369 case IPV6_SADDR_RULE_SCOPE:
1370 ret = score->scopedist;
1371 break;
1372 case IPV6_SADDR_RULE_PREFIX:
1373 ret = score->matchlen;
1374 break;
1375 default:
1376 ret = !!test_bit(i, score->scorebits);
1377 }
1378 goto out;
1379 }
1380
1381 switch (i) {
1382 case IPV6_SADDR_RULE_INIT:
1383 /* Rule 0: remember if hiscore is not ready yet */
1384 ret = !!score->ifa;
1385 break;
1386 case IPV6_SADDR_RULE_LOCAL:
1387 /* Rule 1: Prefer same address */
1388 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1389 break;
1390 case IPV6_SADDR_RULE_SCOPE:
1391 /* Rule 2: Prefer appropriate scope
1392 *
1393 * ret
1394 * ^
1395 * -1 | d 15
1396 * ---+--+-+---> scope
1397 * |
1398 * | d is scope of the destination.
1399 * B-d | \
1400 * | \ <- smaller scope is better if
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08001401 * B-15 | \ if scope is enough for destination.
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001402 * | ret = B - scope (-1 <= scope >= d <= 15).
1403 * d-C-1 | /
1404 * |/ <- greater is better
1405 * -C / if scope is not enough for destination.
1406 * /| ret = scope - C (-1 <= d < scope <= 15).
1407 *
1408 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1409 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1410 * Assume B = 0 and we get C > 29.
1411 */
1412 ret = __ipv6_addr_src_scope(score->addr_type);
1413 if (ret >= dst->scope)
1414 ret = -ret;
1415 else
1416 ret -= 128; /* 30 is enough */
1417 score->scopedist = ret;
1418 break;
1419 case IPV6_SADDR_RULE_PREFERRED:
Erik Kline7fd25612014-10-28 18:11:14 +09001420 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001421 /* Rule 3: Avoid deprecated and optimistic addresses */
Erik Kline7fd25612014-10-28 18:11:14 +09001422 u8 avoid = IFA_F_DEPRECATED;
1423
1424 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1425 avoid |= IFA_F_OPTIMISTIC;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001426 ret = ipv6_saddr_preferred(score->addr_type) ||
Erik Kline7fd25612014-10-28 18:11:14 +09001427 !(score->ifa->flags & avoid);
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001428 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001429 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001430#ifdef CONFIG_IPV6_MIP6
1431 case IPV6_SADDR_RULE_HOA:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001432 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001433 /* Rule 4: Prefer home address */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001434 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1435 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001436 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001437 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001438#endif
1439 case IPV6_SADDR_RULE_OIF:
1440 /* Rule 5: Prefer outgoing interface */
1441 ret = (!dst->ifindex ||
1442 dst->ifindex == score->ifa->idev->dev->ifindex);
1443 break;
1444 case IPV6_SADDR_RULE_LABEL:
1445 /* Rule 6: Prefer matching label */
Benjamin Thery3de23252008-05-28 14:51:24 +02001446 ret = ipv6_addr_label(net,
1447 &score->ifa->addr, score->addr_type,
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001448 score->ifa->idev->dev->ifindex) == dst->label;
1449 break;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001450 case IPV6_SADDR_RULE_PRIVACY:
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001451 {
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001452 /* Rule 7: Prefer public address
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001453 * Note: prefer temporary address if use_tempaddr >= 2
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001454 */
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001455 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1456 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1457 score->ifa->idev->cnf.use_tempaddr >= 2;
1458 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001459 break;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001460 }
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001461 case IPV6_SADDR_RULE_ORCHID:
1462 /* Rule 8-: Prefer ORCHID vs ORCHID or
1463 * non-ORCHID vs non-ORCHID
1464 */
1465 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1466 ipv6_addr_orchid(dst->addr));
1467 break;
1468 case IPV6_SADDR_RULE_PREFIX:
1469 /* Rule 8: Use longest matching prefix */
YOSHIFUJI Hideaki / 吉藤英明91b4b042012-09-10 18:41:07 +00001470 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1471 if (ret > score->ifa->prefix_len)
1472 ret = score->ifa->prefix_len;
1473 score->matchlen = ret;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001474 break;
Erik Kline7fd25612014-10-28 18:11:14 +09001475#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1476 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1477 /* Optimistic addresses still have lower precedence than other
1478 * preferred addresses.
1479 */
1480 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1481 break;
1482#endif
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001483 default:
1484 ret = 0;
1485 }
1486
1487 if (ret)
1488 __set_bit(i, score->scorebits);
1489 score->rule = i;
1490out:
1491 return ret;
1492}
1493
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001494static int __ipv6_dev_get_saddr(struct net *net,
1495 struct ipv6_saddr_dst *dst,
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001496 struct inet6_dev *idev,
1497 struct ipv6_saddr_score *scores,
1498 int hiscore_idx)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001499{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001500 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001501
1502 read_lock_bh(&idev->lock);
1503 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1504 int i;
1505
1506 /*
1507 * - Tentative Address (RFC2462 section 5.4)
1508 * - A tentative address is not considered
1509 * "assigned to an interface" in the traditional
1510 * sense, unless it is also flagged as optimistic.
1511 * - Candidate Source Address (section 4)
1512 * - In any case, anycast addresses, multicast
1513 * addresses, and the unspecified address MUST
1514 * NOT be included in a candidate set.
1515 */
1516 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1517 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1518 continue;
1519
1520 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1521
1522 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1523 score->addr_type & IPV6_ADDR_MULTICAST)) {
1524 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1525 idev->dev->name);
1526 continue;
1527 }
1528
1529 score->rule = -1;
1530 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1531
1532 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1533 int minihiscore, miniscore;
1534
1535 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1536 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1537
1538 if (minihiscore > miniscore) {
1539 if (i == IPV6_SADDR_RULE_SCOPE &&
1540 score->scopedist > 0) {
1541 /*
1542 * special case:
1543 * each remaining entry
1544 * has too small (not enough)
1545 * scope, because ifa entries
1546 * are sorted by their scope
1547 * values.
1548 */
1549 goto out;
1550 }
1551 break;
1552 } else if (minihiscore < miniscore) {
1553 if (hiscore->ifa)
1554 in6_ifa_put(hiscore->ifa);
1555
1556 in6_ifa_hold(score->ifa);
1557
1558 swap(hiscore, score);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001559 hiscore_idx = 1 - hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001560
1561 /* restore our iterator */
1562 score->ifa = hiscore->ifa;
1563
1564 break;
1565 }
1566 }
1567 }
1568out:
1569 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001570 return hiscore_idx;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001571}
1572
David Ahernafbac6012016-06-16 16:24:26 -07001573static int ipv6_get_saddr_master(struct net *net,
1574 const struct net_device *dst_dev,
1575 const struct net_device *master,
1576 struct ipv6_saddr_dst *dst,
1577 struct ipv6_saddr_score *scores,
1578 int hiscore_idx)
1579{
1580 struct inet6_dev *idev;
1581
1582 idev = __in6_dev_get(dst_dev);
1583 if (idev)
1584 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1585 scores, hiscore_idx);
1586
1587 idev = __in6_dev_get(master);
1588 if (idev)
1589 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1590 scores, hiscore_idx);
1591
1592 return hiscore_idx;
1593}
1594
Patrick McHardyb3f644f2012-08-26 19:14:14 +02001595int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001596 const struct in6_addr *daddr, unsigned int prefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001597 struct in6_addr *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598{
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001599 struct ipv6_saddr_score scores[2], *hiscore;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001600 struct ipv6_saddr_dst dst;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001601 struct inet6_dev *idev;
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001602 struct net_device *dev;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001603 int dst_type;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001604 bool use_oif_addr = false;
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001605 int hiscore_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001607 dst_type = __ipv6_addr_type(daddr);
1608 dst.addr = daddr;
1609 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1610 dst.scope = __ipv6_addr_src_scope(dst_type);
Benjamin Thery3de23252008-05-28 14:51:24 +02001611 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001612 dst.prefs = prefs;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001613
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001614 scores[hiscore_idx].rule = -1;
1615 scores[hiscore_idx].ifa = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001617 rcu_read_lock();
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001618
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001619 /* Candidate Source Address (section 4)
1620 * - multicast and link-local destination address,
1621 * the set of candidate source address MUST only
1622 * include addresses assigned to interfaces
1623 * belonging to the same link as the outgoing
1624 * interface.
1625 * (- For site-local destination addresses, the
1626 * set of candidate source addresses MUST only
1627 * include addresses assigned to interfaces
1628 * belonging to the same site as the outgoing
1629 * interface.)
Erik Kline3985e8a2015-07-22 16:38:25 +09001630 * - "It is RECOMMENDED that the candidate source addresses
1631 * be the set of unicast addresses assigned to the
1632 * interface that will be used to send to the destination
1633 * (the 'outgoing' interface)." (RFC 6724)
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001634 */
1635 if (dst_dev) {
Erik Kline3985e8a2015-07-22 16:38:25 +09001636 idev = __in6_dev_get(dst_dev);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001637 if ((dst_type & IPV6_ADDR_MULTICAST) ||
Erik Kline3985e8a2015-07-22 16:38:25 +09001638 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1639 (idev && idev->cnf.use_oif_addrs_only)) {
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001640 use_oif_addr = true;
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001641 }
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001642 }
1643
1644 if (use_oif_addr) {
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001645 if (idev)
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001646 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001647 } else {
David Ahernafbac6012016-06-16 16:24:26 -07001648 const struct net_device *master;
1649 int master_idx = 0;
1650
1651 /* if dst_dev exists and is enslaved to an L3 device, then
1652 * prefer addresses from dst_dev and then the master over
1653 * any other enslaved devices in the L3 domain.
1654 */
1655 master = l3mdev_master_dev_rcu(dst_dev);
1656 if (master) {
1657 master_idx = master->ifindex;
1658
1659 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1660 master, &dst,
1661 scores, hiscore_idx);
1662
1663 if (scores[hiscore_idx].ifa)
1664 goto out;
1665 }
1666
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001667 for_each_netdev_rcu(net, dev) {
David Ahernafbac6012016-06-16 16:24:26 -07001668 /* only consider addresses on devices in the
1669 * same L3 domain
1670 */
1671 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1672 continue;
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001673 idev = __in6_dev_get(dev);
1674 if (!idev)
1675 continue;
YOSHIFUJI Hideakic15df302015-07-16 16:51:30 +09001676 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
YOSHIFUJI Hideaki/吉藤英明9131f3d2015-07-10 16:58:31 +09001677 }
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001678 }
David Ahernafbac6012016-06-16 16:24:26 -07001679
1680out:
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001681 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
YOSHIFUJI Hideaki/吉藤英明c0b8da12015-07-13 23:28:10 +09001683 hiscore = &scores[hiscore_idx];
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001684 if (!hiscore->ifa)
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001685 return -EADDRNOTAVAIL;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001686
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001687 *saddr = hiscore->ifa->addr;
YOSHIFUJI Hideakia9b05722008-03-02 10:48:21 +09001688 in6_ifa_put(hiscore->ifa);
YOSHIFUJI Hideaki072047e42005-11-08 09:38:30 -08001689 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690}
YOSHIFUJI Hideaki5e5f3f02008-03-03 21:44:34 +09001691EXPORT_SYMBOL(ipv6_dev_get_saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
Amerigo Wang89657792013-06-29 21:30:49 +08001693int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001694 u32 banned_flags)
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001695{
1696 struct inet6_ifaddr *ifp;
1697 int err = -EADDRNOTAVAIL;
1698
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01001699 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1700 if (ifp->scope > IFA_LINK)
1701 break;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001702 if (ifp->scope == IFA_LINK &&
1703 !(ifp->flags & banned_flags)) {
1704 *addr = ifp->addr;
1705 err = 0;
1706 break;
1707 }
1708 }
1709 return err;
1710}
1711
Neil Horman95c385b2007-04-25 17:08:10 -07001712int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
Jiri Pirko479840f2013-12-06 09:45:21 +01001713 u32 banned_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714{
1715 struct inet6_dev *idev;
1716 int err = -EADDRNOTAVAIL;
1717
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001718 rcu_read_lock();
Stephen Hemmingere21e8462010-03-20 16:09:01 -07001719 idev = __in6_dev_get(dev);
1720 if (idev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 read_lock_bh(&idev->lock);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02001722 err = __ipv6_get_lladdr(idev, addr, banned_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 read_unlock_bh(&idev->lock);
1724 }
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07001725 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 return err;
1727}
1728
1729static int ipv6_count_addresses(struct inet6_dev *idev)
1730{
1731 int cnt = 0;
1732 struct inet6_ifaddr *ifp;
1733
1734 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001735 list_for_each_entry(ifp, &idev->addr_list, if_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 cnt++;
1737 read_unlock_bh(&idev->lock);
1738 return cnt;
1739}
1740
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001741int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
Florian Westphal2a7851b2013-05-17 03:56:10 +00001742 const struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743{
Erik Klinec58da4c2015-02-04 20:01:23 +09001744 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1745}
1746EXPORT_SYMBOL(ipv6_chk_addr);
1747
1748int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1749 const struct net_device *dev, int strict,
1750 u32 banned_flags)
1751{
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001752 struct inet6_ifaddr *ifp;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001753 unsigned int hash = inet6_addr_hash(addr);
Erik Klinec58da4c2015-02-04 20:01:23 +09001754 u32 ifp_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755
stephen hemminger5c578aed2010-03-17 20:31:11 +00001756 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001757 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001758 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcanobfeade02008-01-10 22:43:18 -08001759 continue;
Erik Klinec58da4c2015-02-04 20:01:23 +09001760 /* Decouple optimistic from tentative for evaluation here.
1761 * Ban optimistic addresses explicitly, when required.
1762 */
1763 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1764 ? (ifp->flags&~IFA_F_TENTATIVE)
1765 : ifp->flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 if (ipv6_addr_equal(&ifp->addr, addr) &&
Erik Klinec58da4c2015-02-04 20:01:23 +09001767 !(ifp_flags&banned_flags) &&
Ian Morris63159f22015-03-29 14:00:04 +01001768 (!dev || ifp->idev->dev == dev ||
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001769 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1770 rcu_read_unlock_bh();
1771 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 }
1773 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001774
Stephen Hemmingereedf0422010-05-17 22:27:12 -07001775 rcu_read_unlock_bh();
1776 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777}
Erik Klinec58da4c2015-02-04 20:01:23 +09001778EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +09001779
David S. Miller3e81c6d2010-03-20 16:18:00 -07001780static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1781 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782{
Eric Dumazetddbe5032012-07-18 08:11:12 +00001783 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00001784 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785
Sasha Levinb67bfe02013-02-27 17:06:00 -08001786 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001787 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano06bfe652008-01-10 22:43:42 -08001788 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001790 if (!dev || ifp->idev->dev == dev)
David S. Miller3e81c6d2010-03-20 16:18:00 -07001791 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 }
1793 }
David S. Miller3e81c6d2010-03-20 16:18:00 -07001794 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795}
1796
Catalin\(ux\) M. BOIE7df37ff2013-09-23 23:04:19 +03001797/* Compares an address/prefix_len with addresses on device @dev.
1798 * If one is found it returns true.
1799 */
1800bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1801 const unsigned int prefix_len, struct net_device *dev)
1802{
1803 struct inet6_dev *idev;
1804 struct inet6_ifaddr *ifa;
1805 bool ret = false;
1806
1807 rcu_read_lock();
1808 idev = __in6_dev_get(dev);
1809 if (idev) {
1810 read_lock_bh(&idev->lock);
1811 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1812 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1813 if (ret)
1814 break;
1815 }
1816 read_unlock_bh(&idev->lock);
1817 }
1818 rcu_read_unlock();
1819
1820 return ret;
1821}
1822EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1823
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001824int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001825{
1826 struct inet6_dev *idev;
1827 struct inet6_ifaddr *ifa;
1828 int onlink;
1829
1830 onlink = 0;
1831 rcu_read_lock();
1832 idev = __in6_dev_get(dev);
1833 if (idev) {
1834 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00001835 list_for_each_entry(ifa, &idev->addr_list, if_list) {
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001836 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1837 ifa->prefix_len);
1838 if (onlink)
1839 break;
1840 }
1841 read_unlock_bh(&idev->lock);
1842 }
1843 rcu_read_unlock();
1844 return onlink;
1845}
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -04001846EXPORT_SYMBOL(ipv6_chk_prefix);
1847
YOSHIFUJI Hideaki9acd9f32008-04-10 15:42:10 +09001848struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001849 struct net_device *dev, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850{
David S. Millerb79d1d52010-03-25 21:39:21 -07001851 struct inet6_ifaddr *ifp, *result = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00001852 unsigned int hash = inet6_addr_hash(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
stephen hemminger5c578aed2010-03-17 20:31:11 +00001854 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08001855 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001856 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08001857 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 if (ipv6_addr_equal(&ifp->addr, addr)) {
Ian Morris63159f22015-03-29 14:00:04 +01001859 if (!dev || ifp->idev->dev == dev ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
David S. Millerb79d1d52010-03-25 21:39:21 -07001861 result = ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 in6_ifa_hold(ifp);
1863 break;
1864 }
1865 }
1866 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00001867 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868
David S. Millerb79d1d52010-03-25 21:39:21 -07001869 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870}
1871
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872/* Gets referenced address, destroys ifaddr */
1873
Brian Haleycc411d02009-09-09 14:41:32 +00001874static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875{
Lubomir Rintel3d171f32016-01-08 13:47:23 +01001876 if (dad_failed)
1877 ifp->flags |= IFA_F_DADFAILED;
1878
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 if (ifp->flags&IFA_F_PERMANENT) {
1880 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001881 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 ifp->flags |= IFA_F_TENTATIVE;
1883 spin_unlock_bh(&ifp->lock);
Herbert Xue2577a02010-03-13 12:23:29 -08001884 if (dad_failed)
1885 ipv6_ifa_notify(0, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 in6_ifa_put(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 } else if (ifp->flags&IFA_F_TEMPORARY) {
1888 struct inet6_ifaddr *ifpub;
1889 spin_lock_bh(&ifp->lock);
1890 ifpub = ifp->ifpub;
1891 if (ifpub) {
1892 in6_ifa_hold(ifpub);
1893 spin_unlock_bh(&ifp->lock);
1894 ipv6_create_tempaddr(ifpub, ifp);
1895 in6_ifa_put(ifpub);
1896 } else {
1897 spin_unlock_bh(&ifp->lock);
1898 }
1899 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001900 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 ipv6_del_addr(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001902 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903}
1904
Herbert Xuf2344a12010-05-18 15:55:27 -07001905static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1906{
1907 int err = -ENOENT;
1908
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001909 spin_lock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001910 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1911 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1912 err = 0;
1913 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001914 spin_unlock_bh(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07001915
1916 return err;
1917}
1918
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09001919void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1920{
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001921 struct inet6_dev *idev = ifp->idev;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001922 struct net *net = dev_net(ifp->idev->dev);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001923
Ursula Braun853dc2e2010-10-24 23:06:43 +00001924 if (addrconf_dad_end(ifp)) {
1925 in6_ifa_put(ifp);
Herbert Xuf2344a12010-05-18 15:55:27 -07001926 return;
Ursula Braun853dc2e2010-10-24 23:06:43 +00001927 }
Herbert Xuf2344a12010-05-18 15:55:27 -07001928
Joe Perchese87cc472012-05-13 21:56:26 +00001929 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1930 ifp->idev->dev->name, &ifp->addr);
Brian Haley9bdd8d42009-03-18 18:22:48 -07001931
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001932 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001933
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001934 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1935 int scope = ifp->scope;
1936 u32 flags = ifp->flags;
1937 struct in6_addr new_addr;
1938 struct inet6_ifaddr *ifp2;
1939 u32 valid_lft, preferred_lft;
1940 int pfxlen = ifp->prefix_len;
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001941 int retries = ifp->stable_privacy_retry + 1;
1942
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001943 if (retries > net->ipv6.sysctl.idgen_retries) {
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001944 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1945 ifp->idev->dev->name);
1946 goto errdad;
1947 }
1948
1949 new_addr = ifp->addr;
1950 if (ipv6_generate_stable_address(&new_addr, retries,
1951 idev))
1952 goto errdad;
1953
1954 valid_lft = ifp->valid_lft;
1955 preferred_lft = ifp->prefered_lft;
1956
1957 spin_unlock_bh(&ifp->lock);
1958
1959 if (idev->cnf.max_addresses &&
1960 ipv6_count_addresses(idev) >=
1961 idev->cnf.max_addresses)
1962 goto lock_errdad;
1963
1964 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1965 ifp->idev->dev->name);
1966
1967 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1968 scope, flags, valid_lft,
1969 preferred_lft);
1970 if (IS_ERR(ifp2))
1971 goto lock_errdad;
1972
1973 spin_lock_bh(&ifp2->lock);
1974 ifp2->stable_privacy_retry = retries;
1975 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1976 spin_unlock_bh(&ifp2->lock);
1977
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01001978 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001979 in6_ifa_put(ifp2);
1980lock_errdad:
1981 spin_lock_bh(&ifp->lock);
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09001982 }
1983
Hannes Frederic Sowa5f40ef72015-03-23 23:36:04 +01001984errdad:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001985 /* transition from _POSTDAD to _ERRDAD */
1986 ifp->state = INET6_IFADDR_STATE_ERRDAD;
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01001987 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01001988
1989 addrconf_mod_dad_work(ifp, 0);
Wei Yongjun751eb6b2016-09-05 16:06:31 +08001990 in6_ifa_put(ifp);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09001991}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02001993/* Join to solicited addr multicast group.
1994 * caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001995void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996{
1997 struct in6_addr maddr;
1998
1999 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2000 return;
2001
2002 addrconf_addr_solict_mult(addr, &maddr);
2003 ipv6_dev_mc_inc(dev, &maddr);
2004}
2005
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002006/* caller must hold RTNL */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00002007void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008{
2009 struct in6_addr maddr;
2010
2011 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012 return;
2013
2014 addrconf_addr_solict_mult(addr, &maddr);
2015 __ipv6_dev_mc_dec(idev, &maddr);
2016}
2017
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002018/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002019static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020{
2021 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002022
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002023 if (ifp->prefix_len >= 127) /* RFC 6164 */
Bjørn Mork2bda8a02011-07-05 23:04:13 +00002024 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2026 if (ipv6_addr_any(&addr))
2027 return;
WANG Cong013b4d92014-09-11 15:35:11 -07002028 __ipv6_dev_ac_inc(ifp->idev, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029}
2030
Sabrina Dubrocaa9ed4a22014-09-02 10:29:29 +02002031/* caller must hold RTNL */
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002032static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033{
2034 struct in6_addr addr;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002035
Hannes Frederic Sowa88ad3142014-01-06 17:53:14 +01002036 if (ifp->prefix_len >= 127) /* RFC 6164 */
YOSHIFUJI Hideaki32019e62011-07-24 11:44:34 +00002037 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2039 if (ipv6_addr_any(&addr))
2040 return;
2041 __ipv6_dev_ac_dec(ifp->idev, &addr);
2042}
2043
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002044static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2045{
Alexander Aring5241c2d2015-12-14 20:55:22 +01002046 if (dev->addr_len != EUI64_ADDR_LEN)
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002047 return -1;
Alexander Aring5241c2d2015-12-14 20:55:22 +01002048 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
YOSHIFUJI Hideaki / 吉藤英明5e98a362013-01-28 10:44:29 +00002049 eui[0] ^= 2;
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002050 return 0;
2051}
2052
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002053static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2054{
2055 union fwnet_hwaddr *ha;
2056
2057 if (dev->addr_len != FWNET_ALEN)
2058 return -1;
2059
2060 ha = (union fwnet_hwaddr *)dev->dev_addr;
2061
2062 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2063 eui[0] ^= 2;
2064 return 0;
2065}
2066
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002067static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2068{
2069 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2070 if (dev->addr_len != ARCNET_ALEN)
2071 return -1;
2072 memset(eui, 0, 7);
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002073 eui[7] = *(u8 *)dev->dev_addr;
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002074 return 0;
2075}
2076
2077static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2078{
2079 if (dev->addr_len != INFINIBAND_ALEN)
2080 return -1;
2081 memcpy(eui, dev->dev_addr + 12, 8);
2082 eui[0] |= 2;
2083 return 0;
2084}
2085
stephen hemmingerc61393e2010-10-04 20:17:53 +00002086static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002087{
Sascha Hlusiak9af28512009-05-19 12:56:51 +00002088 if (addr == 0)
2089 return -1;
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002090 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2091 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2092 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2093 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2094 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2095 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2096 eui[1] = 0;
2097 eui[2] = 0x5E;
2098 eui[3] = 0xFE;
2099 memcpy(eui + 4, &addr, 4);
2100 return 0;
2101}
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002102
2103static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2104{
2105 if (dev->priv_flags & IFF_ISATAP)
2106 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2107 return -1;
2108}
2109
stephen hemmingeraee80b52011-06-08 10:44:30 +00002110static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2111{
2112 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2113}
2114
Nicolas Dichtele8377352013-08-20 12:16:06 +02002115static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2116{
2117 memcpy(eui, dev->perm_addr, 3);
2118 memcpy(eui + 5, dev->perm_addr + 3, 3);
2119 eui[3] = 0xFF;
2120 eui[4] = 0xFE;
2121 eui[0] ^= 2;
2122 return 0;
2123}
2124
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2126{
2127 switch (dev->type) {
2128 case ARPHRD_ETHER:
2129 case ARPHRD_FDDI:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002130 return addrconf_ifid_eui48(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 case ARPHRD_ARCNET:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002132 return addrconf_ifid_arcnet(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133 case ARPHRD_INFINIBAND:
YOSHIFUJI Hideaki073a8e02006-03-20 16:54:49 -08002134 return addrconf_ifid_infiniband(eui, dev);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002135 case ARPHRD_SIT:
YOSHIFUJI Hideakidfd982b2008-04-10 15:42:09 +09002136 return addrconf_ifid_sit(eui, dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00002137 case ARPHRD_IPGRE:
2138 return addrconf_ifid_gre(eui, dev);
Jukka Rissanene74bccb82013-12-11 17:05:36 +02002139 case ARPHRD_6LOWPAN:
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00002140 return addrconf_ifid_eui64(eui, dev);
YOSHIFUJI Hideaki / 吉藤英明cb6bf352013-03-25 08:26:24 +00002141 case ARPHRD_IEEE1394:
2142 return addrconf_ifid_ieee1394(eui, dev);
Nicolas Dichtele8377352013-08-20 12:16:06 +02002143 case ARPHRD_TUNNEL6:
2144 return addrconf_ifid_ip6tnl(eui, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 }
2146 return -1;
2147}
2148
2149static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2150{
2151 int err = -1;
2152 struct inet6_ifaddr *ifp;
2153
2154 read_lock_bh(&idev->lock);
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01002155 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2156 if (ifp->scope > IFA_LINK)
2157 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2159 memcpy(eui, ifp->addr.s6_addr+8, 8);
2160 err = 0;
2161 break;
2162 }
2163 }
2164 read_unlock_bh(&idev->lock);
2165 return err;
2166}
2167
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002169static void ipv6_regen_rndid(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171regen:
YOSHIFUJI Hideaki955189e2006-03-20 16:54:09 -08002172 get_random_bytes(idev->rndid, sizeof(idev->rndid));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 idev->rndid[0] &= ~0x02;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174
2175 /*
2176 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2177 * check if generated address is not inappropriate
2178 *
2179 * - Reserved subnet anycast (RFC 2526)
2180 * 11111101 11....11 1xxxxxxx
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11002181 * - ISATAP (RFC4214) 6.1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182 * 00-00-5E-FE-xx-xx-xx-xx
2183 * - value 0
2184 * - XXX: already assigned to an address on the device
2185 */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002186 if (idev->rndid[0] == 0xfd &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2188 (idev->rndid[7]&0x80))
2189 goto regen;
2190 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2191 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2192 goto regen;
2193 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2194 goto regen;
2195 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196}
2197
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002198static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002199{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
Jiri Bohac9d6280d2016-10-13 18:50:02 +02002201 ipv6_regen_rndid(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203
2204/*
2205 * Add prefix route.
2206 */
2207
2208static void
2209addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07002210 unsigned long expires, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211{
Thomas Graf86872cb2006-08-22 00:01:08 -07002212 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002213 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
Thomas Graf86872cb2006-08-22 00:01:08 -07002214 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2215 .fc_ifindex = dev->ifindex,
2216 .fc_expires = expires,
2217 .fc_dst_len = plen,
2218 .fc_flags = RTF_UP | flags,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002219 .fc_nlinfo.nl_net = dev_net(dev),
Stephen Hemmingerf410a1f2008-08-23 05:16:46 -07002220 .fc_protocol = RTPROT_KERNEL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002221 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00002223 cfg.fc_dst = *pfx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224
2225 /* Prevent useless cloning on PtP SIT.
2226 This thing is done here expecting that the whole
2227 class of non-broadcast devices need not cloning.
2228 */
Amerigo Wang07a93622012-10-29 16:23:10 +00002229#if IS_ENABLED(CONFIG_IPV6_SIT)
Thomas Graf86872cb2006-08-22 00:01:08 -07002230 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2231 cfg.fc_flags |= RTF_NONEXTHOP;
Joerg Roedel0be669b2006-10-10 14:49:53 -07002232#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233
Thomas Graf86872cb2006-08-22 00:01:08 -07002234 ip6_route_add(&cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235}
2236
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002237
2238static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2239 int plen,
2240 const struct net_device *dev,
2241 u32 flags, u32 noflags)
2242{
2243 struct fib6_node *fn;
2244 struct rt6_info *rt = NULL;
2245 struct fib6_table *table;
David Ahernca254492015-10-12 11:47:10 -07002246 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002247
David Ahernca254492015-10-12 11:47:10 -07002248 table = fib6_get_table(dev_net(dev), tb_id);
Ian Morris63159f22015-03-29 14:00:04 +01002249 if (!table)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002250 return NULL;
2251
Li RongQing5744dd92012-09-11 21:59:01 +00002252 read_lock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002253 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2254 if (!fn)
2255 goto out;
Martin KaFai Lau1f56a01f2015-04-28 13:03:03 -07002256
2257 noflags |= RTF_CACHE;
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002258 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
David S. Millerd1918542011-12-28 20:19:20 -05002259 if (rt->dst.dev->ifindex != dev->ifindex)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002260 continue;
2261 if ((rt->rt6i_flags & flags) != flags)
2262 continue;
Romain Kuntz85da53b2013-01-09 15:02:26 +01002263 if ((rt->rt6i_flags & noflags) != 0)
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002264 continue;
2265 dst_hold(&rt->dst);
2266 break;
2267 }
2268out:
Li RongQing5744dd92012-09-11 21:59:01 +00002269 read_unlock_bh(&table->tb6_lock);
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002270 return rt;
2271}
2272
2273
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274/* Create "default" multicast route to the interface */
2275
2276static void addrconf_add_mroute(struct net_device *dev)
2277{
Thomas Graf86872cb2006-08-22 00:01:08 -07002278 struct fib6_config cfg = {
David Ahernca254492015-10-12 11:47:10 -07002279 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
Thomas Graf86872cb2006-08-22 00:01:08 -07002280 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2281 .fc_ifindex = dev->ifindex,
2282 .fc_dst_len = 8,
2283 .fc_flags = RTF_UP,
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002284 .fc_nlinfo.nl_net = dev_net(dev),
Thomas Graf86872cb2006-08-22 00:01:08 -07002285 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286
Thomas Graf86872cb2006-08-22 00:01:08 -07002287 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2288
2289 ip6_route_add(&cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290}
2291
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2293{
2294 struct inet6_dev *idev;
2295
2296 ASSERT_RTNL();
2297
Stephen Hemmingere21e8462010-03-20 16:09:01 -07002298 idev = ipv6_find_idev(dev);
2299 if (!idev)
Brian Haley64e724f2010-07-20 10:34:30 +00002300 return ERR_PTR(-ENOBUFS);
2301
2302 if (idev->cnf.disable_ipv6)
2303 return ERR_PTR(-EACCES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304
2305 /* Add default multicast route */
David Ahernba46ee42016-06-13 13:44:18 -07002306 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
Li Wei4af04ab2011-12-06 21:23:45 +00002307 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 return idev;
2310}
2311
Jiri Pirko53bd6742013-12-06 09:45:22 +01002312static void manage_tempaddrs(struct inet6_dev *idev,
2313 struct inet6_ifaddr *ifp,
2314 __u32 valid_lft, __u32 prefered_lft,
2315 bool create, unsigned long now)
2316{
2317 u32 flags;
2318 struct inet6_ifaddr *ift;
2319
2320 read_lock_bh(&idev->lock);
2321 /* update all temporary addresses in the list */
2322 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2323 int age, max_valid, max_prefered;
2324
2325 if (ifp != ift->ifpub)
2326 continue;
2327
2328 /* RFC 4941 section 3.3:
2329 * If a received option will extend the lifetime of a public
2330 * address, the lifetimes of temporary addresses should
2331 * be extended, subject to the overall constraint that no
2332 * temporary addresses should ever remain "valid" or "preferred"
2333 * for a time longer than (TEMP_VALID_LIFETIME) or
2334 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2335 */
2336 age = (now - ift->cstamp) / HZ;
2337 max_valid = idev->cnf.temp_valid_lft - age;
2338 if (max_valid < 0)
2339 max_valid = 0;
2340
2341 max_prefered = idev->cnf.temp_prefered_lft -
Jiri Bohac76506a92016-10-13 18:52:15 +02002342 idev->desync_factor - age;
Jiri Pirko53bd6742013-12-06 09:45:22 +01002343 if (max_prefered < 0)
2344 max_prefered = 0;
2345
2346 if (valid_lft > max_valid)
2347 valid_lft = max_valid;
2348
2349 if (prefered_lft > max_prefered)
2350 prefered_lft = max_prefered;
2351
2352 spin_lock(&ift->lock);
2353 flags = ift->flags;
2354 ift->valid_lft = valid_lft;
2355 ift->prefered_lft = prefered_lft;
2356 ift->tstamp = now;
2357 if (prefered_lft > 0)
2358 ift->flags &= ~IFA_F_DEPRECATED;
2359
2360 spin_unlock(&ift->lock);
2361 if (!(flags&IFA_F_TENTATIVE))
2362 ipv6_ifa_notify(0, ift);
2363 }
2364
2365 if ((create || list_empty(&idev->tempaddr_list)) &&
2366 idev->cnf.use_tempaddr > 0) {
2367 /* When a new public address is created as described
2368 * in [ADDRCONF], also create a new temporary address.
2369 * Also create a temporary address if it's enabled but
2370 * no temporary address currently exists.
2371 */
2372 read_unlock_bh(&idev->lock);
2373 ipv6_create_tempaddr(ifp, NULL);
2374 } else {
2375 read_unlock_bh(&idev->lock);
2376 }
2377}
2378
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002379static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2380{
2381 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2382 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2383}
2384
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002385int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2386 const struct prefix_info *pinfo,
2387 struct inet6_dev *in6_dev,
2388 const struct in6_addr *addr, int addr_type,
2389 u32 addr_flags, bool sllao, bool tokenized,
2390 __u32 valid_lft, u32 prefered_lft)
Alexander Aring4f672232016-06-15 21:20:22 +02002391{
2392 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2393 int create = 0, update_lft = 0;
2394
2395 if (!ifp && valid_lft) {
2396 int max_addresses = in6_dev->cnf.max_addresses;
2397
2398#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2399 if (in6_dev->cnf.optimistic_dad &&
2400 !net->ipv6.devconf_all->forwarding && sllao)
2401 addr_flags |= IFA_F_OPTIMISTIC;
2402#endif
2403
2404 /* Do not allow to create too much of autoconfigured
2405 * addresses; this would be too easy way to crash kernel.
2406 */
2407 if (!max_addresses ||
2408 ipv6_count_addresses(in6_dev) < max_addresses)
2409 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2410 pinfo->prefix_len,
2411 addr_type&IPV6_ADDR_SCOPE_MASK,
2412 addr_flags, valid_lft,
2413 prefered_lft);
2414
2415 if (IS_ERR_OR_NULL(ifp))
2416 return -1;
2417
2418 update_lft = 0;
2419 create = 1;
2420 spin_lock_bh(&ifp->lock);
2421 ifp->flags |= IFA_F_MANAGETEMPADDR;
2422 ifp->cstamp = jiffies;
2423 ifp->tokenized = tokenized;
2424 spin_unlock_bh(&ifp->lock);
2425 addrconf_dad_start(ifp);
2426 }
2427
2428 if (ifp) {
2429 u32 flags;
2430 unsigned long now;
2431 u32 stored_lft;
2432
2433 /* update lifetime (RFC2462 5.5.3 e) */
2434 spin_lock_bh(&ifp->lock);
2435 now = jiffies;
2436 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2437 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2438 else
2439 stored_lft = 0;
2440 if (!update_lft && !create && stored_lft) {
2441 const u32 minimum_lft = min_t(u32,
2442 stored_lft, MIN_VALID_LIFETIME);
2443 valid_lft = max(valid_lft, minimum_lft);
2444
2445 /* RFC4862 Section 5.5.3e:
2446 * "Note that the preferred lifetime of the
2447 * corresponding address is always reset to
2448 * the Preferred Lifetime in the received
2449 * Prefix Information option, regardless of
2450 * whether the valid lifetime is also reset or
2451 * ignored."
2452 *
2453 * So we should always update prefered_lft here.
2454 */
2455 update_lft = 1;
2456 }
2457
2458 if (update_lft) {
2459 ifp->valid_lft = valid_lft;
2460 ifp->prefered_lft = prefered_lft;
2461 ifp->tstamp = now;
2462 flags = ifp->flags;
2463 ifp->flags &= ~IFA_F_DEPRECATED;
2464 spin_unlock_bh(&ifp->lock);
2465
2466 if (!(flags&IFA_F_TENTATIVE))
2467 ipv6_ifa_notify(0, ifp);
2468 } else
2469 spin_unlock_bh(&ifp->lock);
2470
2471 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2472 create, now);
2473
2474 in6_ifa_put(ifp);
2475 addrconf_verify();
2476 }
2477
2478 return 0;
2479}
Alexander Aringcc84b3c2016-06-15 21:20:24 +02002480EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
Alexander Aring4f672232016-06-15 21:20:22 +02002481
Neil Hormane6bff9952012-01-04 10:49:15 +00002482void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483{
2484 struct prefix_info *pinfo;
2485 __u32 valid_lft;
2486 __u32 prefered_lft;
Alexander Aring4f672232016-06-15 21:20:22 +02002487 int addr_type, err;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002488 u32 addr_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 struct inet6_dev *in6_dev;
Brian Haley56d417b2009-06-01 03:07:33 -07002490 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491
2492 pinfo = (struct prefix_info *) opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002493
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494 if (len < sizeof(struct prefix_info)) {
dingtianhongba3542e2013-08-17 10:27:04 +08002495 ADBG("addrconf: prefix option too short\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 return;
2497 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002498
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 /*
2500 * Validation checks ([ADDRCONF], page 19)
2501 */
2502
2503 addr_type = ipv6_addr_type(&pinfo->prefix);
2504
2505 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2506 return;
2507
2508 valid_lft = ntohl(pinfo->valid);
2509 prefered_lft = ntohl(pinfo->prefered);
2510
2511 if (prefered_lft > valid_lft) {
Joe Perchese87cc472012-05-13 21:56:26 +00002512 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 return;
2514 }
2515
2516 in6_dev = in6_dev_get(dev);
2517
Ian Morris63159f22015-03-29 14:00:04 +01002518 if (!in6_dev) {
Joe Perchese87cc472012-05-13 21:56:26 +00002519 net_dbg_ratelimited("addrconf: device %s not configured\n",
2520 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 return;
2522 }
2523
2524 /*
2525 * Two things going on here:
2526 * 1) Add routes for on-link prefixes
2527 * 2) Configure prefixes with the auto flag set
2528 */
2529
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002530 if (pinfo->onlink) {
2531 struct rt6_info *rt;
2532 unsigned long rt_expires;
2533
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002534 /* Avoid arithmetic overflow. Really, we could
2535 * save rt_expires in seconds, likely valid_lft,
2536 * but it would require division in fib gc, that it
2537 * not good.
2538 */
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002539 if (HZ > USER_HZ)
2540 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2541 else
2542 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
YOSHIFUJI Hideaki3dd4bc62005-12-19 14:02:45 -08002543
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002544 if (addrconf_finite_timeout(rt_expires))
2545 rt_expires *= HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002547 rt = addrconf_get_prefix_route(&pinfo->prefix,
2548 pinfo->prefix_len,
2549 dev,
2550 RTF_ADDRCONF | RTF_PREFIX_RT,
2551 RTF_GATEWAY | RTF_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552
Andreas Hofmeister14ef37b2011-10-26 03:24:29 +00002553 if (rt) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002554 /* Autoconf prefix route */
2555 if (valid_lft == 0) {
2556 ip6_del_rt(rt);
2557 rt = NULL;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002558 } else if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002559 /* not infinity */
Gao feng1716a962012-04-06 00:13:10 +00002560 rt6_set_expires(rt, jiffies + rt_expires);
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002561 } else {
Gao feng1716a962012-04-06 00:13:10 +00002562 rt6_clean_expires(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 }
2564 } else if (valid_lft) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002565 clock_t expires = 0;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002566 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2567 if (addrconf_finite_timeout(rt_expires)) {
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002568 /* not infinity */
2569 flags |= RTF_EXPIRES;
2570 expires = jiffies_to_clock_t(rt_expires);
2571 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002572 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002573 dev, expires, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002574 }
Amerigo Wang94e187c2012-10-29 00:13:19 +00002575 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576 }
2577
2578 /* Try to figure out our local address for this prefix */
2579
2580 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 struct in6_addr addr;
Alexander Aringf997c552016-06-15 21:20:23 +02002582 bool tokenized = false, dev_addr_generated = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583
2584 if (pinfo->prefix_len == 64) {
2585 memcpy(&addr, &pinfo->prefix, 8);
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002586
2587 if (!ipv6_addr_any(&in6_dev->token)) {
2588 read_lock_bh(&in6_dev->lock);
2589 memcpy(addr.s6_addr + 8,
2590 in6_dev->token.s6_addr + 8, 8);
2591 read_unlock_bh(&in6_dev->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00002592 tokenized = true;
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01002593 } else if (is_addr_mode_generate_stable(in6_dev) &&
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002594 !ipv6_generate_stable_address(&addr, 0,
2595 in6_dev)) {
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01002596 addr_flags |= IFA_F_STABLE_PRIVACY;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01002597 goto ok;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00002598 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2599 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
Alexander Aring4f672232016-06-15 21:20:22 +02002600 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002601 } else {
2602 dev_addr_generated = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 }
2604 goto ok;
2605 }
Joe Perchese87cc472012-05-13 21:56:26 +00002606 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2607 pinfo->prefix_len);
Alexander Aring4f672232016-06-15 21:20:22 +02002608 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609
2610ok:
Alexander Aring4f672232016-06-15 21:20:22 +02002611 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2612 &addr, addr_type,
2613 addr_flags, sllao,
2614 tokenized, valid_lft,
2615 prefered_lft);
2616 if (err)
2617 goto put;
Alexander Aringf997c552016-06-15 21:20:23 +02002618
2619 /* Ignore error case here because previous prefix add addr was
2620 * successful which will be notified.
2621 */
2622 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2623 addr_type, addr_flags, sllao,
2624 tokenized, valid_lft,
2625 prefered_lft,
2626 dev_addr_generated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 }
2628 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
Alexander Aring4f672232016-06-15 21:20:22 +02002629put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 in6_dev_put(in6_dev);
2631}
2632
2633/*
2634 * Set destination address.
2635 * Special case for SIT interfaces where we create a new "virtual"
2636 * device.
2637 */
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002638int addrconf_set_dstaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639{
2640 struct in6_ifreq ireq;
2641 struct net_device *dev;
2642 int err = -EINVAL;
2643
2644 rtnl_lock();
2645
2646 err = -EFAULT;
2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648 goto err_exit;
2649
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002650 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651
2652 err = -ENODEV;
Ian Morris63159f22015-03-29 14:00:04 +01002653 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654 goto err_exit;
2655
Amerigo Wang07a93622012-10-29 16:23:10 +00002656#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 if (dev->type == ARPHRD_SIT) {
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002658 const struct net_device_ops *ops = dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 struct ifreq ifr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 struct ip_tunnel_parm p;
2661
2662 err = -EADDRNOTAVAIL;
2663 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2664 goto err_exit;
2665
2666 memset(&p, 0, sizeof(p));
2667 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2668 p.iph.saddr = 0;
2669 p.iph.version = 4;
2670 p.iph.ihl = 5;
2671 p.iph.protocol = IPPROTO_IPV6;
2672 p.iph.ttl = 64;
Stephen Hemmingerd20b3102008-01-21 00:48:43 -08002673 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674
Stephen Hemminger5bc3eb72008-11-19 21:52:05 -08002675 if (ops->ndo_do_ioctl) {
2676 mm_segment_t oldfs = get_fs();
2677
2678 set_fs(KERNEL_DS);
2679 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2680 set_fs(oldfs);
2681 } else
2682 err = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683
2684 if (err == 0) {
2685 err = -ENOBUFS;
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002686 dev = __dev_get_by_name(net, p.name);
2687 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688 goto err_exit;
2689 err = dev_open(dev);
2690 }
2691 }
Joerg Roedel0be669b2006-10-10 14:49:53 -07002692#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693
2694err_exit:
2695 rtnl_unlock();
2696 return err;
2697}
2698
Madhu Challa93a714d2015-02-25 09:58:35 -08002699static int ipv6_mc_config(struct sock *sk, bool join,
2700 const struct in6_addr *addr, int ifindex)
2701{
2702 int ret;
2703
2704 ASSERT_RTNL();
2705
2706 lock_sock(sk);
2707 if (join)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002708 ret = ipv6_sock_mc_join(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002709 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03002710 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
Madhu Challa93a714d2015-02-25 09:58:35 -08002711 release_sock(sk);
2712
2713 return ret;
2714}
2715
Linus Torvalds1da177e2005-04-16 15:20:36 -07002716/*
2717 * Manual configuration of address on an interface
2718 */
Jiri Pirko479840f2013-12-06 09:45:21 +01002719static int inet6_addr_add(struct net *net, int ifindex,
2720 const struct in6_addr *pfx,
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002721 const struct in6_addr *peer_pfx,
Jiri Pirko479840f2013-12-06 09:45:21 +01002722 unsigned int plen, __u32 ifa_flags,
2723 __u32 prefered_lft, __u32 valid_lft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724{
2725 struct inet6_ifaddr *ifp;
2726 struct inet6_dev *idev;
2727 struct net_device *dev;
Madhu Challa93a714d2015-02-25 09:58:35 -08002728 unsigned long timeout;
2729 clock_t expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 int scope;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002731 u32 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732
2733 ASSERT_RTNL();
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002734
Thomas Graf24ef0da2008-05-28 16:54:22 +02002735 if (plen > 128)
2736 return -EINVAL;
2737
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09002738 /* check the lifetime */
2739 if (!valid_lft || prefered_lft > valid_lft)
2740 return -EINVAL;
2741
Jiri Pirko53bd6742013-12-06 09:45:22 +01002742 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2743 return -EINVAL;
2744
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002745 dev = __dev_get_by_index(net, ifindex);
2746 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747 return -ENODEV;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002748
Brian Haley64e724f2010-07-20 10:34:30 +00002749 idev = addrconf_add_dev(dev);
2750 if (IS_ERR(idev))
2751 return PTR_ERR(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002752
Madhu Challa93a714d2015-02-25 09:58:35 -08002753 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2754 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2755 true, pfx, ifindex);
2756
2757 if (ret < 0)
2758 return ret;
2759 }
2760
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 scope = ipv6_addr_scope(pfx);
2762
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002763 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2764 if (addrconf_finite_timeout(timeout)) {
2765 expires = jiffies_to_clock_t(timeout * HZ);
2766 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002767 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002768 } else {
2769 expires = 0;
2770 flags = 0;
2771 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07002772 }
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09002773
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09002774 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2775 if (addrconf_finite_timeout(timeout)) {
2776 if (timeout == 0)
2777 ifa_flags |= IFA_F_DEPRECATED;
2778 prefered_lft = timeout;
2779 }
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09002780
Jiri Benc8a226b22013-08-01 10:41:28 +02002781 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2782 valid_lft, prefered_lft);
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09002783
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 if (!IS_ERR(ifp)) {
Thomas Haller761aac72014-01-15 15:36:58 +01002785 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2786 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2787 expires, flags);
2788 }
2789
Neil Horman95c385b2007-04-25 17:08:10 -07002790 /*
2791 * Note that section 3.1 of RFC 4429 indicates
2792 * that the Optimistic flag should not be set for
2793 * manually configured addresses
2794 */
David S. Millercf22f9a2012-04-14 21:37:40 -04002795 addrconf_dad_start(ifp);
Jiri Pirko53bd6742013-12-06 09:45:22 +01002796 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2797 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2798 true, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002799 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01002800 addrconf_verify_rtnl();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801 return 0;
Madhu Challa93a714d2015-02-25 09:58:35 -08002802 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804 false, pfx, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805 }
2806
2807 return PTR_ERR(ifp);
2808}
2809
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002810static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2811 const struct in6_addr *pfx, unsigned int plen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002812{
2813 struct inet6_ifaddr *ifp;
2814 struct inet6_dev *idev;
2815 struct net_device *dev;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002816
Thomas Graf24ef0da2008-05-28 16:54:22 +02002817 if (plen > 128)
2818 return -EINVAL;
2819
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002820 dev = __dev_get_by_index(net, ifindex);
2821 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002822 return -ENODEV;
2823
Ian Morrise5d08d72014-11-23 21:28:43 +00002824 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002825 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826 return -ENXIO;
2827
2828 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00002829 list_for_each_entry(ifp, &idev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830 if (ifp->prefix_len == plen &&
2831 ipv6_addr_equal(pfx, &ifp->addr)) {
2832 in6_ifa_hold(ifp);
2833 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002834
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002835 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2836 (ifa_flags & IFA_F_MANAGETEMPADDR))
2837 manage_tempaddrs(idev, ifp, 0, 0, false,
2838 jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839 ipv6_del_addr(ifp);
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002840 addrconf_verify_rtnl();
Madhu Challa93a714d2015-02-25 09:58:35 -08002841 if (ipv6_addr_is_multicast(pfx)) {
2842 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2843 false, pfx, dev->ifindex);
2844 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002845 return 0;
2846 }
2847 }
2848 read_unlock_bh(&idev->lock);
2849 return -EADDRNOTAVAIL;
2850}
2851
2852
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002853int addrconf_add_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854{
2855 struct in6_ifreq ireq;
2856 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002857
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002858 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 return -EPERM;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002860
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2862 return -EFAULT;
2863
2864 rtnl_lock();
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00002865 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002866 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2867 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868 rtnl_unlock();
2869 return err;
2870}
2871
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002872int addrconf_del_ifaddr(struct net *net, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002873{
2874 struct in6_ifreq ireq;
2875 int err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002876
Eric W. Biedermanaf31f412012-11-16 03:03:06 +00002877 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002878 return -EPERM;
2879
2880 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2881 return -EFAULT;
2882
2883 rtnl_lock();
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02002884 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08002885 ireq.ifr6_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 rtnl_unlock();
2887 return err;
2888}
2889
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002890static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2891 int plen, int scope)
2892{
2893 struct inet6_ifaddr *ifp;
2894
Jiri Benc8a226b22013-08-01 10:41:28 +02002895 ifp = ipv6_add_addr(idev, addr, NULL, plen,
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01002896 scope, IFA_F_PERMANENT,
2897 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002898 if (!IS_ERR(ifp)) {
2899 spin_lock_bh(&ifp->lock);
2900 ifp->flags &= ~IFA_F_TENTATIVE;
2901 spin_unlock_bh(&ifp->lock);
2902 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2903 in6_ifa_put(ifp);
2904 }
2905}
2906
Amerigo Wang07a93622012-10-29 16:23:10 +00002907#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908static void sit_add_v4_addrs(struct inet6_dev *idev)
2909{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910 struct in6_addr addr;
2911 struct net_device *dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002912 struct net *net = dev_net(idev->dev);
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002913 int scope, plen;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002914 u32 pflags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915
2916 ASSERT_RTNL();
2917
2918 memset(&addr, 0, sizeof(struct in6_addr));
2919 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2920
2921 if (idev->dev->flags&IFF_POINTOPOINT) {
2922 addr.s6_addr32[0] = htonl(0xfe800000);
2923 scope = IFA_LINK;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002924 plen = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 } else {
2926 scope = IPV6_ADDR_COMPATv4;
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002927 plen = 96;
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002928 pflags |= RTF_NONEXTHOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 }
2930
2931 if (addr.s6_addr32[3]) {
Nicolas Dichtel929c9cf2013-11-14 13:51:05 +01002932 add_addr(idev, &addr, plen, scope);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002933 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934 return;
2935 }
2936
Benjamin Thery6fda7352008-03-05 10:47:47 -08002937 for_each_netdev(net, dev) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002938 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 if (in_dev && (dev->flags & IFF_UP)) {
Eldad Zack8e5e8f32012-04-01 07:49:08 +00002940 struct in_ifaddr *ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941
2942 int flag = scope;
2943
2944 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002945
2946 addr.s6_addr32[3] = ifa->ifa_local;
2947
2948 if (ifa->ifa_scope == RT_SCOPE_LINK)
2949 continue;
2950 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2951 if (idev->dev->flags&IFF_POINTOPOINT)
2952 continue;
2953 flag |= IFA_HOST;
2954 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002956 add_addr(idev, &addr, plen, flag);
Nicolas Dichtelf0e2acf2013-11-14 13:51:06 +01002957 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2958 pflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 }
2960 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09002961 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962}
Joerg Roedel0be669b2006-10-10 14:49:53 -07002963#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964
2965static void init_loopback(struct net_device *dev)
2966{
2967 struct inet6_dev *idev;
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05302968 struct net_device *sp_dev;
2969 struct inet6_ifaddr *sp_ifa;
2970 struct rt6_info *sp_rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971
2972 /* ::1 */
2973
2974 ASSERT_RTNL();
2975
Ian Morrise5d08d72014-11-23 21:28:43 +00002976 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01002977 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00002978 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979 return;
2980 }
2981
Ilpo Järvinenb5f348e2009-02-06 23:48:01 -08002982 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05302983
2984 /* Add routes to other interface's IPv6 addresses */
2985 for_each_netdev(dev_net(dev), sp_dev) {
2986 if (!strcmp(sp_dev->name, dev->name))
2987 continue;
2988
2989 idev = __in6_dev_get(sp_dev);
2990 if (!idev)
2991 continue;
2992
2993 read_lock_bh(&idev->lock);
2994 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2995
2996 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2997 continue;
2998
Gao feng33d99112014-01-24 16:29:11 +08002999 if (sp_ifa->rt) {
3000 /* This dst has been added to garbage list when
3001 * lo device down, release this obsolete dst and
3002 * reallocate a new router for ifa.
3003 */
Nicolas Dichtela2204452016-10-12 10:10:40 +02003004 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
Gao feng33d99112014-01-24 16:29:11 +08003005 ip6_rt_put(sp_ifa->rt);
3006 sp_ifa->rt = NULL;
3007 } else {
3008 continue;
3009 }
3010 }
Gao fenga881ae12013-06-16 11:14:30 +08003011
François-Xavier Le Bail57ec0af2013-12-02 11:28:49 +01003012 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303013
3014 /* Failure cases are ignored */
Gao feng534c8772013-06-02 22:16:21 +00003015 if (!IS_ERR(sp_rt)) {
3016 sp_ifa->rt = sp_rt;
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303017 ip6_ins_rt(sp_rt);
Gao feng534c8772013-06-02 22:16:21 +00003018 }
Balakumaran Kannan25fb6ca42013-04-02 16:15:05 +05303019 }
3020 read_unlock_bh(&idev->lock);
3021 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022}
3023
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003024void addrconf_add_linklocal(struct inet6_dev *idev,
3025 const struct in6_addr *addr, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003027 struct inet6_ifaddr *ifp;
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003028 u32 addr_flags = flags | IFA_F_PERMANENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
Neil Horman95c385b2007-04-25 17:08:10 -07003030#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3031 if (idev->cnf.optimistic_dad &&
David Miller702beb82008-07-20 18:17:02 -07003032 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
Neil Horman95c385b2007-04-25 17:08:10 -07003033 addr_flags |= IFA_F_OPTIMISTIC;
3034#endif
3035
Hannes Frederic Sowa07edd742014-01-08 15:43:22 +01003036 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3037 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038 if (!IS_ERR(ifp)) {
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09003039 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
David S. Millercf22f9a2012-04-14 21:37:40 -04003040 addrconf_dad_start(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041 in6_ifa_put(ifp);
3042 }
3043}
Alexander Aring2ad3ed52016-06-15 21:20:17 +02003044EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003046static bool ipv6_reserved_interfaceid(struct in6_addr address)
3047{
3048 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3049 return true;
3050
3051 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3052 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3053 return true;
3054
3055 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3056 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3057 return true;
3058
3059 return false;
3060}
3061
3062static int ipv6_generate_stable_address(struct in6_addr *address,
3063 u8 dad_count,
3064 const struct inet6_dev *idev)
3065{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003066 static DEFINE_SPINLOCK(lock);
3067 static __u32 digest[SHA_DIGEST_WORDS];
3068 static __u32 workspace[SHA_WORKSPACE_WORDS];
3069
3070 static union {
3071 char __data[SHA_MESSAGE_BYTES];
3072 struct {
3073 struct in6_addr secret;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003074 __be32 prefix[2];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003075 unsigned char hwaddr[MAX_ADDR_LEN];
3076 u8 dad_count;
3077 } __packed;
3078 } data;
3079
3080 struct in6_addr secret;
3081 struct in6_addr temp;
3082 struct net *net = dev_net(idev->dev);
3083
3084 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3085
3086 if (idev->cnf.stable_secret.initialized)
3087 secret = idev->cnf.stable_secret.secret;
3088 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3089 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3090 else
3091 return -1;
3092
3093retry:
3094 spin_lock_bh(&lock);
3095
3096 sha_init(digest);
3097 memset(&data, 0, sizeof(data));
3098 memset(workspace, 0, sizeof(workspace));
3099 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003100 data.prefix[0] = address->s6_addr32[0];
3101 data.prefix[1] = address->s6_addr32[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003102 data.secret = secret;
3103 data.dad_count = dad_count;
3104
3105 sha_transform(digest, data.__data, workspace);
3106
3107 temp = *address;
Hannes Frederic Sowaff402172015-03-24 11:05:28 +01003108 temp.s6_addr32[2] = (__force __be32)digest[0];
3109 temp.s6_addr32[3] = (__force __be32)digest[1];
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003110
3111 spin_unlock_bh(&lock);
3112
3113 if (ipv6_reserved_interfaceid(temp)) {
3114 dad_count++;
Hannes Frederic Sowa1855b7c2015-03-23 23:36:05 +01003115 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003116 return -1;
3117 goto retry;
3118 }
3119
3120 *address = temp;
3121 return 0;
3122}
3123
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003124static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3125{
3126 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3127
3128 if (s->initialized)
3129 return;
3130 s = &idev->cnf.stable_secret;
3131 get_random_bytes(&s->secret, sizeof(s->secret));
3132 s->initialized = true;
3133}
3134
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003135static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3136{
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003137 struct in6_addr addr;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003138
David Ahernca254492015-10-12 11:47:10 -07003139 /* no link local addresses on L3 master devices */
3140 if (netif_is_l3_master(idev->dev))
3141 return;
3142
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003143 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3144
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003145 switch (idev->addr_gen_mode) {
3146 case IN6_ADDR_GEN_MODE_RANDOM:
3147 ipv6_gen_mode_random_init(idev);
3148 /* fallthrough */
3149 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003150 if (!ipv6_generate_stable_address(&addr, 0, idev))
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003151 addrconf_add_linklocal(idev, &addr,
3152 IFA_F_STABLE_PRIVACY);
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01003153 else if (prefix_route)
3154 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003155 break;
3156 case IN6_ADDR_GEN_MODE_EUI64:
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003157 /* addrconf_add_linklocal also adds a prefix_route and we
3158 * only need to care about prefix routes if ipv6_generate_eui64
3159 * couldn't generate one.
3160 */
3161 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
Hannes Frederic Sowa64236f32015-03-23 23:36:02 +01003162 addrconf_add_linklocal(idev, &addr, 0);
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003163 else if (prefix_route)
3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003165 break;
3166 case IN6_ADDR_GEN_MODE_NONE:
3167 default:
3168 /* will not add any link local address */
3169 break;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003170 }
3171}
3172
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173static void addrconf_dev_config(struct net_device *dev)
3174{
Eldad Zack8e5e8f32012-04-01 07:49:08 +00003175 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003176
3177 ASSERT_RTNL();
3178
Herbert Xu74235a22007-06-14 13:02:55 -07003179 if ((dev->type != ARPHRD_ETHER) &&
3180 (dev->type != ARPHRD_FDDI) &&
Herbert Xu74235a22007-06-14 13:02:55 -07003181 (dev->type != ARPHRD_ARCNET) &&
alex.bluesman.smirnov@gmail.com06a4c1c2012-05-10 03:25:52 +00003182 (dev->type != ARPHRD_INFINIBAND) &&
Nicolas Dichtele8377352013-08-20 12:16:06 +02003183 (dev->type != ARPHRD_IEEE1394) &&
Jukka Rissanene74bccb82013-12-11 17:05:36 +02003184 (dev->type != ARPHRD_TUNNEL6) &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003185 (dev->type != ARPHRD_6LOWPAN) &&
3186 (dev->type != ARPHRD_NONE)) {
Herbert Xu74235a22007-06-14 13:02:55 -07003187 /* Alas, we support only Ethernet autoconfiguration. */
3188 return;
3189 }
3190
Linus Torvalds1da177e2005-04-16 15:20:36 -07003191 idev = addrconf_add_dev(dev);
Brian Haley64e724f2010-07-20 10:34:30 +00003192 if (IS_ERR(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003193 return;
3194
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01003195 /* this device type has no EUI support */
3196 if (dev->type == ARPHRD_NONE &&
3197 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3198 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3199
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003200 addrconf_addr_gen(idev, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003201}
3202
Amerigo Wang07a93622012-10-29 16:23:10 +00003203#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003204static void addrconf_sit_config(struct net_device *dev)
3205{
3206 struct inet6_dev *idev;
3207
3208 ASSERT_RTNL();
3209
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003210 /*
3211 * Configure the tunnel with one of our IPv4
3212 * addresses... we should configure all of
Linus Torvalds1da177e2005-04-16 15:20:36 -07003213 * our v4 addrs in the tunnel
3214 */
3215
Ian Morrise5d08d72014-11-23 21:28:43 +00003216 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003217 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003218 pr_debug("%s: add_dev failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003219 return;
3220 }
3221
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003222 if (dev->priv_flags & IFF_ISATAP) {
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003223 addrconf_addr_gen(idev, false);
Fred L. Templinc7dc89c2007-11-29 22:11:40 +11003224 return;
3225 }
3226
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227 sit_add_v4_addrs(idev);
3228
Nicolas Dichtel62b54dd2012-10-01 23:19:14 +00003229 if (dev->flags&IFF_POINTOPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230 addrconf_add_mroute(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003231}
Joerg Roedel0be669b2006-10-10 14:49:53 -07003232#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233
Amerigo Wang07a93622012-10-29 16:23:10 +00003234#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003235static void addrconf_gre_config(struct net_device *dev)
3236{
3237 struct inet6_dev *idev;
stephen hemmingeraee80b52011-06-08 10:44:30 +00003238
stephen hemmingeraee80b52011-06-08 10:44:30 +00003239 ASSERT_RTNL();
3240
Ian Morrise5d08d72014-11-23 21:28:43 +00003241 idev = ipv6_find_idev(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003242 if (!idev) {
Joe Perches91df42b2012-05-15 14:11:54 +00003243 pr_debug("%s: add_dev failed\n", __func__);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003244 return;
3245 }
3246
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02003247 addrconf_addr_gen(idev, true);
Hannes Frederic Sowad9e4ce62015-10-08 18:19:39 +02003248 if (dev->flags & IFF_POINTOPOINT)
3249 addrconf_add_mroute(dev);
stephen hemmingeraee80b52011-06-08 10:44:30 +00003250}
3251#endif
3252
David Ahernf1705ec2016-02-24 09:25:37 -08003253static int fixup_permanent_addr(struct inet6_dev *idev,
3254 struct inet6_ifaddr *ifp)
3255{
3256 if (!ifp->rt) {
3257 struct rt6_info *rt;
3258
3259 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3260 if (unlikely(IS_ERR(rt)))
3261 return PTR_ERR(rt);
3262
3263 ifp->rt = rt;
3264 }
3265
3266 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3267 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3268 idev->dev, 0, 0);
3269 }
3270
3271 addrconf_dad_start(ifp);
3272
3273 return 0;
3274}
3275
3276static void addrconf_permanent_addr(struct net_device *dev)
3277{
3278 struct inet6_ifaddr *ifp, *tmp;
3279 struct inet6_dev *idev;
3280
3281 idev = __in6_dev_get(dev);
3282 if (!idev)
3283 return;
3284
3285 write_lock_bh(&idev->lock);
3286
3287 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3288 if ((ifp->flags & IFA_F_PERMANENT) &&
3289 fixup_permanent_addr(idev, ifp) < 0) {
3290 write_unlock_bh(&idev->lock);
3291 ipv6_del_addr(ifp);
3292 write_lock_bh(&idev->lock);
3293
3294 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3295 idev->dev->name, &ifp->addr);
3296 }
3297 }
3298
3299 write_unlock_bh(&idev->lock);
3300}
3301
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003302static int addrconf_notify(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +00003303 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003304{
Jiri Pirko351638e2013-05-28 01:30:21 +00003305 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
David Ahern4f7f34e2016-04-07 11:10:41 -07003306 struct netdev_notifier_changeupper_info *info;
Eric Dumazet748e2d92012-08-22 21:50:59 +00003307 struct inet6_dev *idev = __in6_dev_get(dev);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003308 int run_pending = 0;
Herbert Xub217d612007-07-30 17:04:52 -07003309 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003310
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003311 switch (event) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003312 case NETDEV_REGISTER:
Herbert Xu74235a22007-06-14 13:02:55 -07003313 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003314 idev = ipv6_add_dev(dev);
WANG Conga317a2f2014-07-25 15:25:09 -07003315 if (IS_ERR(idev))
3316 return notifier_from_errno(PTR_ERR(idev));
YOSHIFUJI Hideaki45ba9dd2007-02-15 02:07:27 +09003317 }
3318 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003319
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003320 case NETDEV_CHANGEMTU:
3321 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3322 if (dev->mtu < IPV6_MIN_MTU) {
3323 addrconf_ifdown(dev, 1);
3324 break;
3325 }
3326
3327 if (idev) {
3328 rt6_mtu_change(dev, dev->mtu);
3329 idev->cnf.mtu6 = dev->mtu;
3330 break;
3331 }
3332
3333 /* allocate new idev */
3334 idev = ipv6_add_dev(dev);
3335 if (IS_ERR(idev))
3336 break;
3337
3338 /* device is still not ready */
3339 if (!(idev->if_flags & IF_READY))
3340 break;
3341
3342 run_pending = 1;
3343
3344 /* fall through */
3345
Linus Torvalds1da177e2005-04-16 15:20:36 -07003346 case NETDEV_UP:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003347 case NETDEV_CHANGE:
Jay Vosburghc2edacf2007-07-09 10:42:47 -07003348 if (dev->flags & IFF_SLAVE)
3349 break;
3350
WANG Cong3ce62a82014-09-11 15:07:16 -07003351 if (idev && idev->cnf.disable_ipv6)
3352 break;
3353
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003354 if (event == NETDEV_UP) {
David Ahern38bd10c2016-04-21 20:56:12 -07003355 /* restore routes for permanent addresses */
3356 addrconf_permanent_addr(dev);
3357
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003358 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003359 /* device is not ready yet. */
Joe Perchesf3213832012-05-15 14:11:53 +00003360 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003361 dev->name);
3362 break;
3363 }
Kristian Slavov99081042006-02-08 16:10:53 -08003364
Evgeniy Polyakovd31c7b82007-11-30 23:36:08 +11003365 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3366 idev = ipv6_add_dev(dev);
3367
WANG Conga317a2f2014-07-25 15:25:09 -07003368 if (!IS_ERR_OR_NULL(idev)) {
Kristian Slavov99081042006-02-08 16:10:53 -08003369 idev->if_flags |= IF_READY;
Benjamin Therye3ec6cf2008-11-05 01:43:57 -08003370 run_pending = 1;
3371 }
Alexander Duyckb7b0b1d2015-10-26 11:06:33 -07003372 } else if (event == NETDEV_CHANGE) {
Mitsuru Chinenf24e3d62007-10-10 02:53:43 -07003373 if (!addrconf_qdisc_ok(dev)) {
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003374 /* device is still not ready. */
3375 break;
3376 }
3377
3378 if (idev) {
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003379 if (idev->if_flags & IF_READY)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003380 /* device is already configured. */
3381 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003382 idev->if_flags |= IF_READY;
3383 }
3384
Joe Perchesf3213832012-05-15 14:11:53 +00003385 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3386 dev->name);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003387
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003388 run_pending = 1;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003389 }
3390
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003391 switch (dev->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +00003392#if IS_ENABLED(CONFIG_IPV6_SIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003393 case ARPHRD_SIT:
3394 addrconf_sit_config(dev);
3395 break;
Joerg Roedel0be669b2006-10-10 14:49:53 -07003396#endif
Amerigo Wang07a93622012-10-29 16:23:10 +00003397#if IS_ENABLED(CONFIG_NET_IPGRE)
stephen hemmingeraee80b52011-06-08 10:44:30 +00003398 case ARPHRD_IPGRE:
3399 addrconf_gre_config(dev);
3400 break;
3401#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003402 case ARPHRD_LOOPBACK:
3403 init_loopback(dev);
3404 break;
3405
3406 default:
3407 addrconf_dev_config(dev);
3408 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003409 }
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003410
WANG Conga317a2f2014-07-25 15:25:09 -07003411 if (!IS_ERR_OR_NULL(idev)) {
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003412 if (run_pending)
3413 addrconf_dad_run(idev);
3414
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003415 /*
3416 * If the MTU changed during the interface down,
3417 * when the interface up, the changed MTU must be
3418 * reflected in the idev as well as routers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003419 */
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003420 if (idev->cnf.mtu6 != dev->mtu &&
3421 dev->mtu >= IPV6_MIN_MTU) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003422 rt6_mtu_change(dev, dev->mtu);
3423 idev->cnf.mtu6 = dev->mtu;
3424 }
3425 idev->tstamp = jiffies;
3426 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003427
3428 /*
3429 * If the changed mtu during down is lower than
3430 * IPV6_MIN_MTU stop IPv6 on this interface.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431 */
3432 if (dev->mtu < IPV6_MIN_MTU)
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003433 addrconf_ifdown(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003434 }
3435 break;
3436
Linus Torvalds1da177e2005-04-16 15:20:36 -07003437 case NETDEV_DOWN:
3438 case NETDEV_UNREGISTER:
3439 /*
3440 * Remove all addresses from this interface.
3441 */
3442 addrconf_ifdown(dev, event != NETDEV_DOWN);
3443 break;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003444
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445 case NETDEV_CHANGENAME:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003446 if (idev) {
Stephen Hemminger5632c512007-04-28 21:16:39 -07003447 snmp6_unregister_dev(idev);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003448 addrconf_sysctl_unregister(idev);
WANG Conga317a2f2014-07-25 15:25:09 -07003449 err = addrconf_sysctl_register(idev);
Herbert Xub217d612007-07-30 17:04:52 -07003450 if (err)
3451 return notifier_from_errno(err);
WANG Conga317a2f2014-07-25 15:25:09 -07003452 err = snmp6_register_dev(idev);
3453 if (err) {
3454 addrconf_sysctl_unregister(idev);
3455 return notifier_from_errno(err);
3456 }
Stephen Hemminger5632c512007-04-28 21:16:39 -07003457 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003458 break;
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003459
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003460 case NETDEV_PRE_TYPE_CHANGE:
3461 case NETDEV_POST_TYPE_CHANGE:
Andrew Lunn3ef09522015-12-03 21:12:32 +01003462 if (idev)
3463 addrconf_type_change(dev, event);
Moni Shoua75c78502009-09-15 02:37:40 -07003464 break;
David Ahern4f7f34e2016-04-07 11:10:41 -07003465
3466 case NETDEV_CHANGEUPPER:
3467 info = ptr;
3468
3469 /* flush all routes if dev is linked to or unlinked from
3470 * an L3 master device (e.g., VRF)
3471 */
3472 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3473 addrconf_ifdown(dev, 0);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003474 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475
3476 return NOTIFY_OK;
3477}
3478
3479/*
3480 * addrconf module should be notified of a device going up
3481 */
3482static struct notifier_block ipv6_dev_notf = {
3483 .notifier_call = addrconf_notify,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003484};
3485
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003486static void addrconf_type_change(struct net_device *dev, unsigned long event)
Moni Shoua75c78502009-09-15 02:37:40 -07003487{
3488 struct inet6_dev *idev;
3489 ASSERT_RTNL();
3490
3491 idev = __in6_dev_get(dev);
3492
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003493 if (event == NETDEV_POST_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003494 ipv6_mc_remap(idev);
Jiri Pirko93d9b7d2010-03-10 10:28:56 +00003495 else if (event == NETDEV_PRE_TYPE_CHANGE)
Moni Shoua75c78502009-09-15 02:37:40 -07003496 ipv6_mc_unmap(idev);
3497}
3498
David Ahern70af9212016-04-08 12:01:21 -07003499static bool addr_is_local(const struct in6_addr *addr)
3500{
3501 return ipv6_addr_type(addr) &
3502 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3503}
3504
Linus Torvalds1da177e2005-04-16 15:20:36 -07003505static int addrconf_ifdown(struct net_device *dev, int how)
3506{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003507 struct net *net = dev_net(dev);
stephen hemminger502a2ff2010-03-17 20:31:13 +00003508 struct inet6_dev *idev;
David Ahernf1705ec2016-02-24 09:25:37 -08003509 struct inet6_ifaddr *ifa, *tmp;
3510 struct list_head del_list;
3511 int _keep_addr;
3512 bool keep_addr;
David S. Miller73a8bd72011-01-23 23:27:15 -08003513 int state, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003514
3515 ASSERT_RTNL();
3516
David S. Miller73a8bd72011-01-23 23:27:15 -08003517 rt6_ifdown(net, dev);
3518 neigh_ifdown(&nd_tbl, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003519
3520 idev = __in6_dev_get(dev);
Ian Morris63159f22015-03-29 14:00:04 +01003521 if (!idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003522 return -ENODEV;
3523
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003524 /*
3525 * Step 1: remove reference to ipv6 device from parent device.
3526 * Do not dev_put!
Linus Torvalds1da177e2005-04-16 15:20:36 -07003527 */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003528 if (how) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529 idev->dead = 1;
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07003530
3531 /* protected by rtnl_lock */
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003532 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003533
3534 /* Step 1.5: remove snmp6 entry */
3535 snmp6_unregister_dev(idev);
3536
3537 }
3538
David Ahernf1705ec2016-02-24 09:25:37 -08003539 /* aggregate the system setting and interface setting */
3540 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3541 if (!_keep_addr)
3542 _keep_addr = idev->cnf.keep_addr_on_down;
3543
3544 /* combine the user config with event to determine if permanent
3545 * addresses are to be removed from address hash table
3546 */
Mike Manningbc561632016-08-12 12:02:38 +01003547 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003548
David S. Miller73a8bd72011-01-23 23:27:15 -08003549 /* Step 2: clear hash table */
3550 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3551 struct hlist_head *h = &inet6_addr_lst[i];
David S. Miller73a8bd72011-01-23 23:27:15 -08003552
3553 spin_lock_bh(&addrconf_hash_lock);
Ian Morris67ba4152014-08-24 21:53:10 +01003554restart:
Sasha Levinb67bfe02013-02-27 17:06:00 -08003555 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
David S. Miller73a8bd72011-01-23 23:27:15 -08003556 if (ifa->idev == idev) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003557 addrconf_del_dad_work(ifa);
David Ahernf1705ec2016-02-24 09:25:37 -08003558 /* combined flag + permanent flag decide if
3559 * address is retained on a down event
3560 */
3561 if (!keep_addr ||
David Ahern70af9212016-04-08 12:01:21 -07003562 !(ifa->flags & IFA_F_PERMANENT) ||
3563 addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003564 hlist_del_init_rcu(&ifa->addr_lst);
3565 goto restart;
3566 }
David S. Miller73a8bd72011-01-23 23:27:15 -08003567 }
3568 }
3569 spin_unlock_bh(&addrconf_hash_lock);
3570 }
3571
Linus Torvalds1da177e2005-04-16 15:20:36 -07003572 write_lock_bh(&idev->lock);
3573
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003574 addrconf_del_rs_timer(idev);
3575
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003576 /* Step 2: clear flags for stateless addrconf */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003577 if (!how)
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003578 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003579
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003580 /* Step 3: clear tempaddr list */
stephen hemminger372e6c82010-03-17 20:31:09 +00003581 while (!list_empty(&idev->tempaddr_list)) {
3582 ifa = list_first_entry(&idev->tempaddr_list,
3583 struct inet6_ifaddr, tmp_list);
3584 list_del(&ifa->tmp_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003585 write_unlock_bh(&idev->lock);
3586 spin_lock_bh(&ifa->lock);
3587
3588 if (ifa->ifpub) {
3589 in6_ifa_put(ifa->ifpub);
3590 ifa->ifpub = NULL;
3591 }
3592 spin_unlock_bh(&ifa->lock);
3593 in6_ifa_put(ifa);
3594 write_lock_bh(&idev->lock);
3595 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003596
David Ahernf1705ec2016-02-24 09:25:37 -08003597 /* re-combine the user config with event to determine if permanent
3598 * addresses are to be removed from the interface list
3599 */
Mike Manningbc561632016-08-12 12:02:38 +01003600 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
David Ahernf1705ec2016-02-24 09:25:37 -08003601
3602 INIT_LIST_HEAD(&del_list);
3603 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
David Ahern38bd10c2016-04-21 20:56:12 -07003604 struct rt6_info *rt = NULL;
3605
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003606 addrconf_del_dad_work(ifa);
stephen hemminger84e8b802010-03-02 13:32:46 +00003607
David S. Miller73a8bd72011-01-23 23:27:15 -08003608 write_unlock_bh(&idev->lock);
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003609 spin_lock_bh(&ifa->lock);
David Ahernf1705ec2016-02-24 09:25:37 -08003610
David Ahern70af9212016-04-08 12:01:21 -07003611 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3612 !addr_is_local(&ifa->addr)) {
David Ahernf1705ec2016-02-24 09:25:37 -08003613 /* set state to skip the notifier below */
3614 state = INET6_IFADDR_STATE_DEAD;
3615 ifa->state = 0;
3616 if (!(ifa->flags & IFA_F_NODAD))
3617 ifa->flags |= IFA_F_TENTATIVE;
David Ahern38bd10c2016-04-21 20:56:12 -07003618
3619 rt = ifa->rt;
3620 ifa->rt = NULL;
David Ahernf1705ec2016-02-24 09:25:37 -08003621 } else {
3622 state = ifa->state;
3623 ifa->state = INET6_IFADDR_STATE_DEAD;
3624
Wei Yongjunc8822192016-07-28 16:19:03 +00003625 list_move(&ifa->if_list, &del_list);
David Ahernf1705ec2016-02-24 09:25:37 -08003626 }
3627
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003628 spin_unlock_bh(&ifa->lock);
stephen hemminger84e8b802010-03-02 13:32:46 +00003629
David Ahern38bd10c2016-04-21 20:56:12 -07003630 if (rt)
3631 ip6_del_rt(rt);
3632
David S. Miller73a8bd72011-01-23 23:27:15 -08003633 if (state != INET6_IFADDR_STATE_DEAD) {
3634 __ipv6_ifa_notify(RTM_DELADDR, ifa);
Cong Wangf88c91d2013-04-14 23:18:43 +08003635 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
Mike Manningea06f712016-07-22 18:32:11 +01003636 } else {
3637 if (idev->cnf.forwarding)
3638 addrconf_leave_anycast(ifa);
3639 addrconf_leave_solict(ifa->idev, &ifa->addr);
stephen hemminger27bdb2a2010-04-12 05:41:32 +00003640 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003641
David S. Miller73a8bd72011-01-23 23:27:15 -08003642 write_lock_bh(&idev->lock);
3643 }
stephen hemminger8f37ada2010-03-03 08:19:59 +00003644
Linus Torvalds1da177e2005-04-16 15:20:36 -07003645 write_unlock_bh(&idev->lock);
3646
David Ahernf1705ec2016-02-24 09:25:37 -08003647 /* now clean up addresses to be removed */
3648 while (!list_empty(&del_list)) {
3649 ifa = list_first_entry(&del_list,
3650 struct inet6_ifaddr, if_list);
3651 list_del(&ifa->if_list);
3652
3653 in6_ifa_put(ifa);
3654 }
3655
Sabrina Dubroca381f4dca2014-09-10 23:23:02 +02003656 /* Step 5: Discard anycast and multicast list */
3657 if (how) {
3658 ipv6_ac_destroy_dev(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003659 ipv6_mc_destroy_dev(idev);
Sabrina Dubroca381f4dca2014-09-10 23:23:02 +02003660 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003661 ipv6_mc_down(idev);
Sabrina Dubroca381f4dca2014-09-10 23:23:02 +02003662 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003663
Linus Torvalds1da177e2005-04-16 15:20:36 -07003664 idev->tstamp = jiffies;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003665
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07003666 /* Last: Shot the device (if unregistered) */
Denis V. Lunev439e2382008-04-03 13:30:17 -07003667 if (how) {
Pavel Emelyanov408c4762008-01-10 17:41:21 -08003668 addrconf_sysctl_unregister(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669 neigh_parms_release(&nd_tbl, idev->nd_parms);
3670 neigh_ifdown(&nd_tbl, dev);
3671 in6_dev_put(idev);
3672 }
3673 return 0;
3674}
3675
3676static void addrconf_rs_timer(unsigned long data)
3677{
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003678 struct inet6_dev *idev = (struct inet6_dev *)data;
Cong Wangcaf92bc2013-08-31 13:44:32 +08003679 struct net_device *dev = idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003680 struct in6_addr lladdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003681
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003682 write_lock(&idev->lock);
stephen hemminger5b2a1952010-03-02 13:32:45 +00003683 if (idev->dead || !(idev->if_flags & IF_READY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003684 goto out;
3685
Shmulik Ladkani9ba2add2012-12-02 01:44:53 +00003686 if (!ipv6_accept_ra(idev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003687 goto out;
stephen hemminger5b2a1952010-03-02 13:32:45 +00003688
3689 /* Announcement received after solicitation was sent */
3690 if (idev->if_flags & IF_RA_RCVD)
3691 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003692
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003693 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
Cong Wangcaf92bc2013-08-31 13:44:32 +08003694 write_unlock(&idev->lock);
3695 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3696 ndisc_send_rs(dev, &lladdr,
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003697 &in6addr_linklocal_allrouters);
3698 else
Cong Wangcaf92bc2013-08-31 13:44:32 +08003699 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003700
Cong Wangcaf92bc2013-08-31 13:44:32 +08003701 write_lock(&idev->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003702 idev->rs_interval = rfc3315_s14_backoff_update(
3703 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003704 /* The wait after the last probe can be shorter */
3705 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3706 idev->cnf.rtr_solicits) ?
3707 idev->cnf.rtr_solicit_delay :
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003708 idev->rs_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003709 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710 /*
3711 * Note: we do not support deprecated "all on-link"
3712 * assumption any longer.
3713 */
Joe Perches91df42b2012-05-15 14:11:54 +00003714 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003715 }
3716
3717out:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003718 write_unlock(&idev->lock);
Cong Wangcaf92bc2013-08-31 13:44:32 +08003719put:
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003720 in6_dev_put(idev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003721}
3722
3723/*
3724 * Duplicate Address Detection
3725 */
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003726static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3727{
3728 unsigned long rand_num;
3729 struct inet6_dev *idev = ifp->idev;
3730
Neil Horman95c385b2007-04-25 17:08:10 -07003731 if (ifp->flags & IFA_F_OPTIMISTIC)
3732 rand_num = 0;
3733 else
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003734 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
Neil Horman95c385b2007-04-25 17:08:10 -07003735
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003736 ifp->dad_probes = idev->cnf.dad_transmits;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003737 addrconf_mod_dad_work(ifp, rand_num);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003738}
3739
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003740static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003741{
3742 struct inet6_dev *idev = ifp->idev;
3743 struct net_device *dev = idev->dev;
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003744 bool notify = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003745
3746 addrconf_join_solict(dev, &ifp->addr);
3747
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05003748 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003749
3750 read_lock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003751 spin_lock(&ifp->lock);
Herbert Xue9d3e082010-05-18 15:36:06 -07003752 if (ifp->state == INET6_IFADDR_STATE_DEAD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003753 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003754
3755 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09003756 idev->cnf.accept_dad < 1 ||
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07003757 !(ifp->flags&IFA_F_TENTATIVE) ||
3758 ifp->flags & IFA_F_NODAD) {
Brian Haleycc411d02009-09-09 14:41:32 +00003759 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003760 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003761 read_unlock_bh(&idev->lock);
3762
3763 addrconf_dad_completed(ifp);
3764 return;
3765 }
3766
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003767 if (!(idev->if_flags & IF_READY)) {
stephen hemminger21809fa2010-02-08 19:48:52 +00003768 spin_unlock(&ifp->lock);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003769 read_unlock_bh(&idev->lock);
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003770 /*
Masatake YAMATO590a9882009-06-09 10:41:12 +09003771 * If the device is not ready:
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003772 * - keep it tentative if it is a permanent address.
3773 * - otherwise, kill it.
3774 */
3775 in6_ifa_hold(ifp);
Brian Haleycc411d02009-09-09 14:41:32 +00003776 addrconf_dad_stop(ifp, 0);
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003777 return;
YOSHIFUJI Hideaki3c21edb2005-12-21 22:57:24 +09003778 }
Neil Horman95c385b2007-04-25 17:08:10 -07003779
3780 /*
3781 * Optimistic nodes can start receiving
3782 * Frames right away
3783 */
Erik Kline7fd25612014-10-28 18:11:14 +09003784 if (ifp->flags & IFA_F_OPTIMISTIC) {
Neil Horman95c385b2007-04-25 17:08:10 -07003785 ip6_ins_rt(ifp->rt);
Erik Kline7fd25612014-10-28 18:11:14 +09003786 if (ipv6_use_optimistic_addr(idev)) {
3787 /* Because optimistic nodes can use this address,
3788 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3789 */
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003790 notify = true;
Erik Kline7fd25612014-10-28 18:11:14 +09003791 }
3792 }
Neil Horman95c385b2007-04-25 17:08:10 -07003793
YOSHIFUJI Hideaki6732bad2005-12-27 13:35:15 -08003794 addrconf_dad_kick(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003795out:
Herbert Xu622ccdf2010-05-18 15:56:06 -07003796 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003797 read_unlock_bh(&idev->lock);
subashab@codeaurora.org16186a82016-02-02 02:11:10 +00003798 if (notify)
3799 ipv6_ifa_notify(RTM_NEWADDR, ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003800}
3801
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003802static void addrconf_dad_start(struct inet6_ifaddr *ifp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003803{
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003804 bool begin_dad = false;
3805
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003806 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003807 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3808 ifp->state = INET6_IFADDR_STATE_PREDAD;
3809 begin_dad = true;
3810 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003811 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003812
3813 if (begin_dad)
3814 addrconf_mod_dad_work(ifp, 0);
3815}
3816
3817static void addrconf_dad_work(struct work_struct *w)
3818{
3819 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3820 struct inet6_ifaddr,
3821 dad_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003822 struct inet6_dev *idev = ifp->idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003823 struct in6_addr mcaddr;
Mike Manning85b51b12016-08-18 14:39:40 +01003824 bool disable_ipv6 = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003825
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003826 enum {
3827 DAD_PROCESS,
3828 DAD_BEGIN,
3829 DAD_ABORT,
3830 } action = DAD_PROCESS;
3831
3832 rtnl_lock();
3833
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003834 spin_lock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003835 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3836 action = DAD_BEGIN;
3837 ifp->state = INET6_IFADDR_STATE_DAD;
3838 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3839 action = DAD_ABORT;
3840 ifp->state = INET6_IFADDR_STATE_POSTDAD;
Mike Manning85b51b12016-08-18 14:39:40 +01003841
3842 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3843 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3844 struct in6_addr addr;
3845
3846 addr.s6_addr32[0] = htonl(0xfe800000);
3847 addr.s6_addr32[1] = 0;
3848
3849 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3850 ipv6_addr_equal(&ifp->addr, &addr)) {
3851 /* DAD failed for link-local based on MAC */
3852 idev->cnf.disable_ipv6 = 1;
3853
3854 pr_info("%s: IPv6 being disabled!\n",
3855 ifp->idev->dev->name);
3856 disable_ipv6 = true;
3857 }
3858 }
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003859 }
Hannes Frederic Sowa8e8e6762015-03-23 23:36:03 +01003860 spin_unlock_bh(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003861
3862 if (action == DAD_BEGIN) {
3863 addrconf_dad_begin(ifp);
3864 goto out;
3865 } else if (action == DAD_ABORT) {
Wei Yongjun751eb6b2016-09-05 16:06:31 +08003866 in6_ifa_hold(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003867 addrconf_dad_stop(ifp, 1);
Mike Manning85b51b12016-08-18 14:39:40 +01003868 if (disable_ipv6)
3869 addrconf_ifdown(idev->dev, 0);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003870 goto out;
3871 }
3872
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003873 if (!ifp->dad_probes && addrconf_dad_end(ifp))
Herbert Xuf2344a12010-05-18 15:55:27 -07003874 goto out;
3875
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003876 write_lock_bh(&idev->lock);
stephen hemminger122e4512010-03-02 13:32:44 +00003877 if (idev->dead || !(idev->if_flags & IF_READY)) {
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003878 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003879 goto out;
3880 }
stephen hemminger21809fa2010-02-08 19:48:52 +00003881
3882 spin_lock(&ifp->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003883 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3884 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003885 write_unlock_bh(&idev->lock);
Herbert Xu622ccdf2010-05-18 15:56:06 -07003886 goto out;
3887 }
3888
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003889 if (ifp->dad_probes == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003890 /*
3891 * DAD was successful
3892 */
3893
Brian Haleycc411d02009-09-09 14:41:32 +00003894 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
stephen hemminger21809fa2010-02-08 19:48:52 +00003895 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003896 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003897
3898 addrconf_dad_completed(ifp);
3899
3900 goto out;
3901 }
3902
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003903 ifp->dad_probes--;
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003904 addrconf_mod_dad_work(ifp,
3905 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
stephen hemminger21809fa2010-02-08 19:48:52 +00003906 spin_unlock(&ifp->lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003907 write_unlock_bh(&idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003908
3909 /* send a neighbour solicitation for our addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003910 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
Nicolas Dichtel304d8882015-11-27 18:17:05 +01003911 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003912out:
3913 in6_ifa_put(ifp);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003914 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003915}
3916
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003917/* ifp->idev must be at least read locked */
3918static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3919{
3920 struct inet6_ifaddr *ifpiter;
3921 struct inet6_dev *idev = ifp->idev;
3922
Hannes Frederic Sowa602582c2014-01-19 21:58:19 +01003923 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3924 if (ifpiter->scope > IFA_LINK)
3925 break;
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003926 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3927 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3928 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3929 IFA_F_PERMANENT)
3930 return false;
3931 }
3932 return true;
3933}
3934
Linus Torvalds1da177e2005-04-16 15:20:36 -07003935static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3936{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003937 struct net_device *dev = ifp->idev->dev;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003938 struct in6_addr lladdr;
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003939 bool send_rs, send_mld;
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003940
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01003941 addrconf_del_dad_work(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003942
3943 /*
3944 * Configure the address for reception. Now it is valid.
3945 */
3946
3947 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3948
Tore Anderson026359b2011-08-28 23:47:33 +00003949 /* If added prefix is link local and we are prepared to process
3950 router advertisements, start sending router solicitations.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951 */
3952
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003953 read_lock_bh(&ifp->idev->lock);
Hannes Frederic Sowa11ffff72014-01-16 20:13:04 +01003954 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003955 send_rs = send_mld &&
3956 ipv6_accept_ra(ifp->idev) &&
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003957 ifp->idev->cnf.rtr_solicits != 0 &&
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003958 (dev->flags&IFF_LOOPBACK) == 0;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003959 read_unlock_bh(&ifp->idev->lock);
3960
Hannes Frederic Sowab173ee42013-06-27 00:07:01 +02003961 /* While dad is in progress mld report's source address is in6_addrany.
3962 * Resend with proper ll now.
3963 */
3964 if (send_mld)
3965 ipv6_mc_dad_complete(ifp->idev);
3966
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003967 if (send_rs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003968 /*
3969 * If a host as already performed a random delay
3970 * [...] as part of DAD [...] there is no need
3971 * to delay again before sending the first RS
3972 */
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003973 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003974 return;
Hannes Frederic Sowa1ec047e2013-06-27 00:06:56 +02003975 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003976
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003977 write_lock_bh(&ifp->idev->lock);
3978 spin_lock(&ifp->lock);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003979 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3980 ifp->idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003981 ifp->idev->rs_probes = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003982 ifp->idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07003983 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
Hannes Frederic Sowab7b1bfc2013-06-23 18:39:01 +02003984 spin_unlock(&ifp->lock);
3985 write_unlock_bh(&ifp->idev->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003986 }
3987}
3988
Stephen Hemmingere21e8462010-03-20 16:09:01 -07003989static void addrconf_dad_run(struct inet6_dev *idev)
3990{
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09003991 struct inet6_ifaddr *ifp;
3992
3993 read_lock_bh(&idev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +00003994 list_for_each_entry(ifp, &idev->addr_list, if_list) {
stephen hemminger21809fa2010-02-08 19:48:52 +00003995 spin_lock(&ifp->lock);
Herbert Xuf2344a12010-05-18 15:55:27 -07003996 if (ifp->flags & IFA_F_TENTATIVE &&
3997 ifp->state == INET6_IFADDR_STATE_DAD)
3998 addrconf_dad_kick(ifp);
stephen hemminger21809fa2010-02-08 19:48:52 +00003999 spin_unlock(&ifp->lock);
YOSHIFUJI Hideakic5e33bd2005-12-21 22:57:44 +09004000 }
4001 read_unlock_bh(&idev->lock);
4002}
4003
Linus Torvalds1da177e2005-04-16 15:20:36 -07004004#ifdef CONFIG_PROC_FS
4005struct if6_iter_state {
Daniel Lezcano3c400902008-01-10 22:42:49 -08004006 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004007 int bucket;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004008 int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004009};
4010
Mihai Maruseac1d578302012-01-03 23:31:35 +00004011static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004012{
4013 struct inet6_ifaddr *ifa = NULL;
4014 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004015 struct net *net = seq_file_net(seq);
Mihai Maruseac1d578302012-01-03 23:31:35 +00004016 int p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004017
Mihai Maruseac1d578302012-01-03 23:31:35 +00004018 /* initial bucket if pos is 0 */
4019 if (pos == 0) {
4020 state->bucket = 0;
4021 state->offset = 0;
4022 }
4023
4024 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08004025 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
Mihai Maruseac1d578302012-01-03 23:31:35 +00004026 addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004027 if (!net_eq(dev_net(ifa->idev->dev), net))
4028 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004029 /* sync with offset */
4030 if (p < state->offset) {
4031 p++;
4032 continue;
4033 }
4034 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004035 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004036 }
4037
4038 /* prepare for next bucket */
4039 state->offset = 0;
4040 p = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004041 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004042 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004043}
4044
stephen hemmingerc2e21292010-03-17 20:31:10 +00004045static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4046 struct inet6_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004047{
4048 struct if6_iter_state *state = seq->private;
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +09004049 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004050
Sasha Levinb67bfe02013-02-27 17:06:00 -08004051 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004052 if (!net_eq(dev_net(ifa->idev->dev), net))
4053 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004054 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004055 return ifa;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004056 }
stephen hemmingerc2e21292010-03-17 20:31:10 +00004057
4058 while (++state->bucket < IN6_ADDR_HSIZE) {
Mihai Maruseac1d578302012-01-03 23:31:35 +00004059 state->offset = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -08004060 hlist_for_each_entry_rcu_bh(ifa,
stephen hemmingerc2e21292010-03-17 20:31:10 +00004061 &inet6_addr_lst[state->bucket], addr_lst) {
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004062 if (!net_eq(dev_net(ifa->idev->dev), net))
4063 continue;
Mihai Maruseac1d578302012-01-03 23:31:35 +00004064 state->offset++;
Eric Dumazet9f0d3c22012-10-16 07:37:27 +00004065 return ifa;
Daniel Lezcano3c400902008-01-10 22:42:49 -08004066 }
4067 }
4068
stephen hemmingerc2e21292010-03-17 20:31:10 +00004069 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004070}
4071
Linus Torvalds1da177e2005-04-16 15:20:36 -07004072static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004073 __acquires(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004074{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004075 rcu_read_lock_bh();
Mihai Maruseac1d578302012-01-03 23:31:35 +00004076 return if6_get_first(seq, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004077}
4078
4079static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4080{
4081 struct inet6_ifaddr *ifa;
4082
4083 ifa = if6_get_next(seq, v);
4084 ++*pos;
4085 return ifa;
4086}
4087
4088static void if6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet4f70ecc2010-05-03 10:50:14 +00004089 __releases(rcu_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004090{
stephen hemminger5c578aed2010-03-17 20:31:11 +00004091 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004092}
4093
4094static int if6_seq_show(struct seq_file *seq, void *v)
4095{
4096 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
Jiri Pirko971a3512013-12-10 13:56:29 +01004097 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
Harvey Harrisonb0711952008-10-28 16:05:40 -07004098 &ifp->addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004099 ifp->idev->dev->ifindex,
4100 ifp->prefix_len,
4101 ifp->scope,
Jiri Pirko971a3512013-12-10 13:56:29 +01004102 (u8) ifp->flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004103 ifp->idev->dev->name);
4104 return 0;
4105}
4106
Philippe De Muyter56b3d972007-07-10 23:07:31 -07004107static const struct seq_operations if6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004108 .start = if6_seq_start,
4109 .next = if6_seq_next,
4110 .show = if6_seq_show,
4111 .stop = if6_seq_stop,
4112};
4113
4114static int if6_seq_open(struct inode *inode, struct file *file)
4115{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004116 return seq_open_net(inode, file, &if6_seq_ops,
4117 sizeof(struct if6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004118}
4119
Arjan van de Ven9a321442007-02-12 00:55:35 -08004120static const struct file_operations if6_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004121 .owner = THIS_MODULE,
4122 .open = if6_seq_open,
4123 .read = seq_read,
4124 .llseek = seq_lseek,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004125 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004126};
4127
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004128static int __net_init if6_proc_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004129{
Gao fengd4beaa62013-02-18 01:34:54 +00004130 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004131 return -ENOMEM;
4132 return 0;
4133}
4134
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004135static void __net_exit if6_proc_net_exit(struct net *net)
Daniel Lezcano3c400902008-01-10 22:42:49 -08004136{
Gao fengece31ff2013-02-18 01:34:56 +00004137 remove_proc_entry("if_inet6", net->proc_net);
Daniel Lezcano3c400902008-01-10 22:42:49 -08004138}
4139
4140static struct pernet_operations if6_proc_net_ops = {
Ian Morris67ba4152014-08-24 21:53:10 +01004141 .init = if6_proc_net_init,
4142 .exit = if6_proc_net_exit,
Daniel Lezcano3c400902008-01-10 22:42:49 -08004143};
4144
4145int __init if6_proc_init(void)
4146{
4147 return register_pernet_subsys(&if6_proc_net_ops);
4148}
4149
Linus Torvalds1da177e2005-04-16 15:20:36 -07004150void if6_proc_exit(void)
4151{
Daniel Lezcano3c400902008-01-10 22:42:49 -08004152 unregister_pernet_subsys(&if6_proc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004153}
4154#endif /* CONFIG_PROC_FS */
4155
Amerigo Wang07a93622012-10-29 16:23:10 +00004156#if IS_ENABLED(CONFIG_IPV6_MIP6)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004157/* Check if address is a home address configured on any interface. */
Eric Dumazetb71d1d42011-04-22 04:53:02 +00004158int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004159{
4160 int ret = 0;
stephen hemmingerc2e21292010-03-17 20:31:10 +00004161 struct inet6_ifaddr *ifp = NULL;
Eric Dumazetddbe5032012-07-18 08:11:12 +00004162 unsigned int hash = inet6_addr_hash(addr);
stephen hemmingerc2e21292010-03-17 20:31:10 +00004163
stephen hemminger5c578aed2010-03-17 20:31:11 +00004164 rcu_read_lock_bh();
Sasha Levinb67bfe02013-02-27 17:06:00 -08004165 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09004166 if (!net_eq(dev_net(ifp->idev->dev), net))
Daniel Lezcano389f6612008-01-10 22:44:40 -08004167 continue;
YOSHIFUJI Hideakicaad2952008-04-10 15:42:07 +09004168 if (ipv6_addr_equal(&ifp->addr, addr) &&
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004169 (ifp->flags & IFA_F_HOMEADDRESS)) {
4170 ret = 1;
4171 break;
4172 }
4173 }
stephen hemminger5c578aed2010-03-17 20:31:11 +00004174 rcu_read_unlock_bh();
Noriaki TAKAMIYA3b9f9a12006-09-22 14:45:56 -07004175 return ret;
4176}
4177#endif
4178
Linus Torvalds1da177e2005-04-16 15:20:36 -07004179/*
4180 * Periodic address status verification
4181 */
4182
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004183static void addrconf_verify_rtnl(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004184{
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004185 unsigned long now, next, next_sec, next_sched;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004186 struct inet6_ifaddr *ifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004187 int i;
4188
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004189 ASSERT_RTNL();
4190
stephen hemminger5c578aed2010-03-17 20:31:11 +00004191 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004192 now = jiffies;
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004193 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004194
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004195 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004196
Stephen Hemmingerbcdd5532010-03-20 16:08:18 -07004197 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004198restart:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004199 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004200 unsigned long age;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004201
Yasushi Asanofad8da32013-12-31 12:04:19 +09004202 /* When setting preferred_lft to a value not zero or
4203 * infinity, while valid_lft is infinity
4204 * IFA_F_PERMANENT has a non-infinity life time.
4205 */
4206 if ((ifp->flags & IFA_F_PERMANENT) &&
4207 (ifp->prefered_lft == INFINITY_LIFE_TIME))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004208 continue;
4209
4210 spin_lock(&ifp->lock);
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004211 /* We try to batch several events at once. */
4212 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004213
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004214 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4215 age >= ifp->valid_lft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004216 spin_unlock(&ifp->lock);
4217 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004218 ipv6_del_addr(ifp);
4219 goto restart;
YOSHIFUJI Hideaki8f27ebb2006-07-28 18:12:11 +09004220 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4221 spin_unlock(&ifp->lock);
4222 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004223 } else if (age >= ifp->prefered_lft) {
Brian Haleya1ed0522009-07-02 07:10:52 +00004224 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004225 int deprecate = 0;
4226
4227 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4228 deprecate = 1;
4229 ifp->flags |= IFA_F_DEPRECATED;
4230 }
4231
Yasushi Asanofad8da32013-12-31 12:04:19 +09004232 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4233 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004234 next = ifp->tstamp + ifp->valid_lft * HZ;
4235
4236 spin_unlock(&ifp->lock);
4237
4238 if (deprecate) {
4239 in6_ifa_hold(ifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004240
4241 ipv6_ifa_notify(0, ifp);
4242 in6_ifa_put(ifp);
4243 goto restart;
4244 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004245 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4246 !(ifp->flags&IFA_F_TENTATIVE)) {
stephen hemminger88949cf2010-03-17 20:31:17 +00004247 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4248 ifp->idev->cnf.dad_transmits *
Jiri Pirko1f9248e2013-12-07 19:26:53 +01004249 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
stephen hemminger88949cf2010-03-17 20:31:17 +00004250
Linus Torvalds1da177e2005-04-16 15:20:36 -07004251 if (age >= ifp->prefered_lft - regen_advance) {
4252 struct inet6_ifaddr *ifpub = ifp->ifpub;
4253 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4254 next = ifp->tstamp + ifp->prefered_lft * HZ;
4255 if (!ifp->regen_count && ifpub) {
4256 ifp->regen_count++;
4257 in6_ifa_hold(ifp);
4258 in6_ifa_hold(ifpub);
4259 spin_unlock(&ifp->lock);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004260
Hiroyuki YAMAMORI291d8092005-12-23 11:24:05 -08004261 spin_lock(&ifpub->lock);
4262 ifpub->regen_count = 0;
4263 spin_unlock(&ifpub->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004264 ipv6_create_tempaddr(ifpub, ifp);
4265 in6_ifa_put(ifpub);
4266 in6_ifa_put(ifp);
4267 goto restart;
4268 }
4269 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4270 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4271 spin_unlock(&ifp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004272 } else {
4273 /* ifp->prefered_lft <= ifp->valid_lft */
4274 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4275 next = ifp->tstamp + ifp->prefered_lft * HZ;
4276 spin_unlock(&ifp->lock);
4277 }
4278 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004279 }
4280
YOSHIFUJI Hideakib2db7562010-03-20 16:11:12 -07004281 next_sec = round_jiffies_up(next);
4282 next_sched = next;
4283
4284 /* If rounded timeout is accurate enough, accept it. */
4285 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4286 next_sched = next_sec;
4287
4288 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4289 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4290 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4291
dingtianhongba3542e2013-08-17 10:27:04 +08004292 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4293 now, next, next_sec, next_sched);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004294 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
stephen hemminger5c578aed2010-03-17 20:31:11 +00004295 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004296}
4297
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004298static void addrconf_verify_work(struct work_struct *w)
4299{
4300 rtnl_lock();
4301 addrconf_verify_rtnl();
4302 rtnl_unlock();
4303}
4304
4305static void addrconf_verify(void)
4306{
4307 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4308}
4309
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004310static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4311 struct in6_addr **peer_pfx)
Thomas Graf461d8832006-09-18 00:09:49 -07004312{
4313 struct in6_addr *pfx = NULL;
4314
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004315 *peer_pfx = NULL;
4316
Thomas Graf461d8832006-09-18 00:09:49 -07004317 if (addr)
4318 pfx = nla_data(addr);
4319
4320 if (local) {
4321 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004322 *peer_pfx = pfx;
4323 pfx = nla_data(local);
Thomas Graf461d8832006-09-18 00:09:49 -07004324 }
4325
4326 return pfx;
4327}
4328
Patrick McHardyef7c79e2007-06-05 12:38:30 -07004329static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
Thomas Graf461d8832006-09-18 00:09:49 -07004330 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4331 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4332 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
Jiri Pirko479840f2013-12-06 09:45:21 +01004333 [IFA_FLAGS] = { .len = sizeof(u32) },
Thomas Graf461d8832006-09-18 00:09:49 -07004334};
4335
Linus Torvalds1da177e2005-04-16 15:20:36 -07004336static int
Thomas Graf661d2962013-03-21 07:45:29 +00004337inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004338{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004339 struct net *net = sock_net(skb->sk);
Thomas Grafb933f712006-09-18 00:10:19 -07004340 struct ifaddrmsg *ifm;
4341 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004342 struct in6_addr *pfx, *peer_pfx;
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004343 u32 ifa_flags;
Thomas Grafb933f712006-09-18 00:10:19 -07004344 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004345
Thomas Grafb933f712006-09-18 00:10:19 -07004346 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4347 if (err < 0)
4348 return err;
4349
4350 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004351 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004352 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004353 return -EINVAL;
4354
Heiner Kallweit6046d5b2014-04-20 21:29:36 +02004355 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4356
4357 /* We ignore other flags so far. */
4358 ifa_flags &= IFA_F_MANAGETEMPADDR;
4359
4360 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4361 ifm->ifa_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004362}
4363
Jiri Pirko479840f2013-12-06 09:45:21 +01004364static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004365 u32 prefered_lft, u32 valid_lft)
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004366{
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004367 u32 flags;
4368 clock_t expires;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004369 unsigned long timeout;
Jiri Pirko53bd6742013-12-06 09:45:22 +01004370 bool was_managetempaddr;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004371 bool had_prefixroute;
YOSHIFUJI Hideaki46d48042007-02-07 20:36:26 +09004372
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004373 ASSERT_RTNL();
4374
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004375 if (!valid_lft || (prefered_lft > valid_lft))
4376 return -EINVAL;
4377
Jiri Pirko53bd6742013-12-06 09:45:22 +01004378 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4379 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4380 return -EINVAL;
4381
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004382 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4383 if (addrconf_finite_timeout(timeout)) {
4384 expires = jiffies_to_clock_t(timeout * HZ);
4385 valid_lft = timeout;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004386 flags = RTF_EXPIRES;
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004387 } else {
4388 expires = 0;
4389 flags = 0;
4390 ifa_flags |= IFA_F_PERMANENT;
YOSHIFUJI Hideaki6f704992008-05-19 16:56:11 -07004391 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004392
YOSHIFUJI Hideaki4bed72e2008-05-27 17:37:49 +09004393 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4394 if (addrconf_finite_timeout(timeout)) {
4395 if (timeout == 0)
4396 ifa_flags |= IFA_F_DEPRECATED;
4397 prefered_lft = timeout;
4398 }
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004399
4400 spin_lock_bh(&ifp->lock);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004401 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
Thomas Haller5b84efe2014-01-15 15:36:59 +01004402 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4403 !(ifp->flags & IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004404 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
Thomas Haller761aac72014-01-15 15:36:58 +01004405 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4406 IFA_F_NOPREFIXROUTE);
Jiri Pirko53bd6742013-12-06 09:45:22 +01004407 ifp->flags |= ifa_flags;
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004408 ifp->tstamp = jiffies;
4409 ifp->valid_lft = valid_lft;
4410 ifp->prefered_lft = prefered_lft;
4411
4412 spin_unlock_bh(&ifp->lock);
4413 if (!(ifp->flags&IFA_F_TENTATIVE))
4414 ipv6_ifa_notify(0, ifp);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004415
Thomas Haller761aac72014-01-15 15:36:58 +01004416 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4417 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4418 expires, flags);
Thomas Haller5b84efe2014-01-15 15:36:59 +01004419 } else if (had_prefixroute) {
4420 enum cleanup_prefix_rt_t action;
4421 unsigned long rt_expires;
4422
4423 write_lock_bh(&ifp->idev->lock);
4424 action = check_cleanup_prefix_route(ifp, &rt_expires);
4425 write_unlock_bh(&ifp->idev->lock);
4426
4427 if (action != CLEANUP_PREFIX_RT_NOP) {
4428 cleanup_prefix_route(ifp, rt_expires,
4429 action == CLEANUP_PREFIX_RT_DEL);
4430 }
Thomas Haller761aac72014-01-15 15:36:58 +01004431 }
Jiri Pirko53bd6742013-12-06 09:45:22 +01004432
4433 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4434 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4435 valid_lft = prefered_lft = 0;
4436 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4437 !was_managetempaddr, jiffies);
4438 }
4439
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01004440 addrconf_verify_rtnl();
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004441
4442 return 0;
4443}
4444
4445static int
Thomas Graf661d2962013-03-21 07:45:29 +00004446inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004447{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004448 struct net *net = sock_net(skb->sk);
Thomas Graf461d8832006-09-18 00:09:49 -07004449 struct ifaddrmsg *ifm;
4450 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004451 struct in6_addr *pfx, *peer_pfx;
Thomas Graf7198f8c2006-09-18 00:13:46 -07004452 struct inet6_ifaddr *ifa;
4453 struct net_device *dev;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004454 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
Jiri Pirko479840f2013-12-06 09:45:21 +01004455 u32 ifa_flags;
Thomas Graf461d8832006-09-18 00:09:49 -07004456 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004457
Thomas Graf461d8832006-09-18 00:09:49 -07004458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4459 if (err < 0)
4460 return err;
4461
4462 ifm = nlmsg_data(nlh);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004463 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
Ian Morris63159f22015-03-29 14:00:04 +01004464 if (!pfx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004465 return -EINVAL;
4466
Thomas Graf461d8832006-09-18 00:09:49 -07004467 if (tb[IFA_CACHEINFO]) {
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09004468 struct ifa_cacheinfo *ci;
Thomas Graf461d8832006-09-18 00:09:49 -07004469
4470 ci = nla_data(tb[IFA_CACHEINFO]);
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09004471 valid_lft = ci->ifa_valid;
Thomas Graf461d8832006-09-18 00:09:49 -07004472 preferred_lft = ci->ifa_prefered;
4473 } else {
4474 preferred_lft = INFINITY_LIFE_TIME;
4475 valid_lft = INFINITY_LIFE_TIME;
Noriaki TAKAMIYA0778769d2006-07-28 18:12:10 +09004476 }
4477
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004478 dev = __dev_get_by_index(net, ifm->ifa_index);
Ian Morris63159f22015-03-29 14:00:04 +01004479 if (!dev)
Thomas Graf7198f8c2006-09-18 00:13:46 -07004480 return -ENODEV;
4481
Jiri Pirko479840f2013-12-06 09:45:21 +01004482 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4483
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004484 /* We ignore other flags so far. */
Thomas Haller761aac72014-01-15 15:36:58 +01004485 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
Madhu Challa93a714d2015-02-25 09:58:35 -08004486 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004487
Daniel Lezcano1cab3da2008-01-10 22:44:09 -08004488 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
Ian Morris63159f22015-03-29 14:00:04 +01004489 if (!ifa) {
Thomas Graf7198f8c2006-09-18 00:13:46 -07004490 /*
4491 * It would be best to check for !NLM_F_CREATE here but
stephen hemmingerdb9c7c32014-01-12 11:26:32 -08004492 * userspace already relies on not having to provide this.
Thomas Graf7198f8c2006-09-18 00:13:46 -07004493 */
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004494 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
Daniel Lezcanoaf284932008-03-05 10:46:57 -08004495 ifm->ifa_prefixlen, ifa_flags,
4496 preferred_lft, valid_lft);
Noriaki TAKAMIYA081bba52006-07-28 18:12:13 +09004497 }
4498
Thomas Graf7198f8c2006-09-18 00:13:46 -07004499 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4500 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4501 err = -EEXIST;
4502 else
Noriaki TAKAMIYA55ebaef2006-09-22 14:45:27 -07004503 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
Thomas Graf7198f8c2006-09-18 00:13:46 -07004504
4505 in6_ifa_put(ifa);
4506
4507 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004508}
4509
Jiri Pirko479840f2013-12-06 09:45:21 +01004510static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
Thomas Graf101bb222006-09-18 00:11:52 -07004511 u8 scope, int ifindex)
4512{
4513 struct ifaddrmsg *ifm;
4514
4515 ifm = nlmsg_data(nlh);
4516 ifm->ifa_family = AF_INET6;
4517 ifm->ifa_prefixlen = prefixlen;
4518 ifm->ifa_flags = flags;
4519 ifm->ifa_scope = scope;
4520 ifm->ifa_index = ifindex;
4521}
4522
Thomas Graf85486af2006-09-18 00:11:24 -07004523static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4524 unsigned long tstamp, u32 preferred, u32 valid)
4525{
4526 struct ifa_cacheinfo ci;
4527
Thomas Graf18a31e12010-11-17 04:12:02 +00004528 ci.cstamp = cstamp_delta(cstamp);
4529 ci.tstamp = cstamp_delta(tstamp);
Thomas Graf85486af2006-09-18 00:11:24 -07004530 ci.ifa_prefered = preferred;
4531 ci.ifa_valid = valid;
4532
4533 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4534}
4535
Thomas Graf101bb222006-09-18 00:11:52 -07004536static inline int rt_scope(int ifa_scope)
4537{
4538 if (ifa_scope & IFA_HOST)
4539 return RT_SCOPE_HOST;
4540 else if (ifa_scope & IFA_LINK)
4541 return RT_SCOPE_LINK;
4542 else if (ifa_scope & IFA_SITE)
4543 return RT_SCOPE_SITE;
4544 else
4545 return RT_SCOPE_UNIVERSE;
4546}
4547
Thomas Graf0ab68032006-09-18 00:12:35 -07004548static inline int inet6_ifaddr_msgsize(void)
4549{
Thomas Graf339bf982006-11-10 14:10:15 -08004550 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004551 + nla_total_size(16) /* IFA_LOCAL */
Thomas Graf339bf982006-11-10 14:10:15 -08004552 + nla_total_size(16) /* IFA_ADDRESS */
Jiri Pirko479840f2013-12-06 09:45:21 +01004553 + nla_total_size(sizeof(struct ifa_cacheinfo))
4554 + nla_total_size(4) /* IFA_FLAGS */;
Thomas Graf0ab68032006-09-18 00:12:35 -07004555}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07004556
Linus Torvalds1da177e2005-04-16 15:20:36 -07004557static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004558 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004559{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004560 struct nlmsghdr *nlh;
Thomas Graf85486af2006-09-18 00:11:24 -07004561 u32 preferred, valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004562
Eric W. Biederman15e47302012-09-07 20:12:54 +00004563 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004564 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004565 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004566
Thomas Graf101bb222006-09-18 00:11:52 -07004567 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4568 ifa->idev->dev->ifindex);
4569
Yasushi Asanofad8da32013-12-31 12:04:19 +09004570 if (!((ifa->flags&IFA_F_PERMANENT) &&
4571 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
Thomas Graf85486af2006-09-18 00:11:24 -07004572 preferred = ifa->prefered_lft;
4573 valid = ifa->valid_lft;
4574 if (preferred != INFINITY_LIFE_TIME) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004575 long tval = (jiffies - ifa->tstamp)/HZ;
Jens Rosenbooma1faa692009-06-25 04:55:50 +00004576 if (preferred > tval)
4577 preferred -= tval;
4578 else
4579 preferred = 0;
Ben Hutchingsf56619f2010-06-26 11:37:47 +00004580 if (valid != INFINITY_LIFE_TIME) {
4581 if (valid > tval)
4582 valid -= tval;
4583 else
4584 valid = 0;
4585 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004586 }
4587 } else {
Thomas Graf85486af2006-09-18 00:11:24 -07004588 preferred = INFINITY_LIFE_TIME;
4589 valid = INFINITY_LIFE_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004590 }
Thomas Graf85486af2006-09-18 00:11:24 -07004591
Cong Wang7996c792013-05-22 05:41:06 +00004592 if (!ipv6_addr_any(&ifa->peer_addr)) {
Jiri Benc930345e2015-03-29 16:59:25 +02004593 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4594 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004595 goto error;
4596 } else
Jiri Benc930345e2015-03-29 16:59:25 +02004597 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004598 goto error;
4599
4600 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4601 goto error;
Thomas Graf85486af2006-09-18 00:11:24 -07004602
Jiri Pirko479840f2013-12-06 09:45:21 +01004603 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4604 goto error;
4605
Johannes Berg053c0952015-01-16 22:09:00 +01004606 nlmsg_end(skb, nlh);
4607 return 0;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004608
4609error:
4610 nlmsg_cancel(skb, nlh);
4611 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004612}
4613
4614static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004615 u32 portid, u32 seq, int event, u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004616{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004617 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004618 u8 scope = RT_SCOPE_UNIVERSE;
4619 int ifindex = ifmca->idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004620
Thomas Graf101bb222006-09-18 00:11:52 -07004621 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4622 scope = RT_SCOPE_SITE;
4623
Eric W. Biederman15e47302012-09-07 20:12:54 +00004624 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004625 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004626 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004627
Thomas Graf101bb222006-09-18 00:11:52 -07004628 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004629 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004630 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004631 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4632 nlmsg_cancel(skb, nlh);
4633 return -EMSGSIZE;
4634 }
Thomas Graf85486af2006-09-18 00:11:24 -07004635
Johannes Berg053c0952015-01-16 22:09:00 +01004636 nlmsg_end(skb, nlh);
4637 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004638}
4639
4640static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004641 u32 portid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004642{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004643 struct nlmsghdr *nlh;
Thomas Graf101bb222006-09-18 00:11:52 -07004644 u8 scope = RT_SCOPE_UNIVERSE;
4645 int ifindex = ifaca->aca_idev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004646
Thomas Graf101bb222006-09-18 00:11:52 -07004647 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4648 scope = RT_SCOPE_SITE;
4649
Eric W. Biederman15e47302012-09-07 20:12:54 +00004650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01004651 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08004652 return -EMSGSIZE;
Thomas Graf0ab68032006-09-18 00:12:35 -07004653
Thomas Graf101bb222006-09-18 00:11:52 -07004654 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
Jiri Benc930345e2015-03-29 16:59:25 +02004655 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
Thomas Graf0ab68032006-09-18 00:12:35 -07004656 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
Patrick McHardy26932562007-01-31 23:16:40 -08004657 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4658 nlmsg_cancel(skb, nlh);
4659 return -EMSGSIZE;
4660 }
Thomas Graf85486af2006-09-18 00:11:24 -07004661
Johannes Berg053c0952015-01-16 22:09:00 +01004662 nlmsg_end(skb, nlh);
4663 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004664}
4665
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004666enum addr_type_t {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004667 UNICAST_ADDR,
4668 MULTICAST_ADDR,
4669 ANYCAST_ADDR,
4670};
4671
Eric Dumazet234b27c2009-11-12 04:11:50 +00004672/* called with rcu_read_lock() */
4673static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4674 struct netlink_callback *cb, enum addr_type_t type,
4675 int s_ip_idx, int *p_ip_idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004676{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004677 struct ifmcaddr6 *ifmca;
4678 struct ifacaddr6 *ifaca;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004679 int err = 1;
4680 int ip_idx = *p_ip_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004681
Eric Dumazet234b27c2009-11-12 04:11:50 +00004682 read_lock_bh(&idev->lock);
4683 switch (type) {
stephen hemminger502a2ff2010-03-17 20:31:13 +00004684 case UNICAST_ADDR: {
4685 struct inet6_ifaddr *ifa;
4686
Eric Dumazet234b27c2009-11-12 04:11:50 +00004687 /* unicast address incl. temp addr */
stephen hemminger502a2ff2010-03-17 20:31:13 +00004688 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4689 if (++ip_idx < s_ip_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004690 continue;
4691 err = inet6_fill_ifaddr(skb, ifa,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004692 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004693 cb->nlh->nlmsg_seq,
4694 RTM_NEWADDR,
4695 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004696 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004697 break;
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004698 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004699 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004700 break;
stephen hemminger502a2ff2010-03-17 20:31:13 +00004701 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004702 case MULTICAST_ADDR:
4703 /* multicast address */
4704 for (ifmca = idev->mc_list; ifmca;
4705 ifmca = ifmca->next, ip_idx++) {
4706 if (ip_idx < s_ip_idx)
4707 continue;
4708 err = inet6_fill_ifmcaddr(skb, ifmca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004709 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004710 cb->nlh->nlmsg_seq,
4711 RTM_GETMULTICAST,
4712 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004713 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004714 break;
4715 }
4716 break;
4717 case ANYCAST_ADDR:
4718 /* anycast address */
4719 for (ifaca = idev->ac_list; ifaca;
4720 ifaca = ifaca->aca_next, ip_idx++) {
4721 if (ip_idx < s_ip_idx)
4722 continue;
4723 err = inet6_fill_ifacaddr(skb, ifaca,
Eric W. Biederman15e47302012-09-07 20:12:54 +00004724 NETLINK_CB(cb->skb).portid,
Eric Dumazet234b27c2009-11-12 04:11:50 +00004725 cb->nlh->nlmsg_seq,
4726 RTM_GETANYCAST,
4727 NLM_F_MULTI);
Johannes Berg053c0952015-01-16 22:09:00 +01004728 if (err < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004729 break;
4730 }
4731 break;
4732 default:
4733 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004734 }
Eric Dumazet234b27c2009-11-12 04:11:50 +00004735 read_unlock_bh(&idev->lock);
4736 *p_ip_idx = ip_idx;
4737 return err;
4738}
4739
4740static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4741 enum addr_type_t type)
4742{
4743 struct net *net = sock_net(skb->sk);
4744 int h, s_h;
4745 int idx, ip_idx;
4746 int s_idx, s_ip_idx;
4747 struct net_device *dev;
4748 struct inet6_dev *idev;
4749 struct hlist_head *head;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004750
4751 s_h = cb->args[0];
4752 s_idx = idx = cb->args[1];
4753 s_ip_idx = ip_idx = cb->args[2];
4754
4755 rcu_read_lock();
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00004756 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
Eric Dumazet234b27c2009-11-12 04:11:50 +00004757 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4758 idx = 0;
4759 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08004760 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet234b27c2009-11-12 04:11:50 +00004761 if (idx < s_idx)
4762 goto cont;
Patrick McHardy4b97efd2010-03-26 20:27:49 -07004763 if (h > s_h || idx > s_idx)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004764 s_ip_idx = 0;
4765 ip_idx = 0;
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004766 idev = __in6_dev_get(dev);
4767 if (!idev)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004768 goto cont;
4769
4770 if (in6_dump_addrs(idev, skb, cb, type,
David S. Miller7b46a642015-01-18 23:36:08 -05004771 s_ip_idx, &ip_idx) < 0)
Eric Dumazet234b27c2009-11-12 04:11:50 +00004772 goto done;
4773cont:
4774 idx++;
4775 }
4776 }
4777done:
4778 rcu_read_unlock();
4779 cb->args[0] = h;
4780 cb->args[1] = idx;
4781 cb->args[2] = ip_idx;
4782
Linus Torvalds1da177e2005-04-16 15:20:36 -07004783 return skb->len;
4784}
4785
4786static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4787{
4788 enum addr_type_t type = UNICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004789
Linus Torvalds1da177e2005-04-16 15:20:36 -07004790 return inet6_dump_addr(skb, cb, type);
4791}
4792
4793static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794{
4795 enum addr_type_t type = MULTICAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004796
Linus Torvalds1da177e2005-04-16 15:20:36 -07004797 return inet6_dump_addr(skb, cb, type);
4798}
4799
4800
4801static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4802{
4803 enum addr_type_t type = ANYCAST_ADDR;
Denis V. Lunevb8542722007-12-01 00:21:31 +11004804
Linus Torvalds1da177e2005-04-16 15:20:36 -07004805 return inet6_dump_addr(skb, cb, type);
4806}
4807
Thomas Graf661d2962013-03-21 07:45:29 +00004808static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004809{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09004810 struct net *net = sock_net(in_skb->sk);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004811 struct ifaddrmsg *ifm;
4812 struct nlattr *tb[IFA_MAX+1];
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004813 struct in6_addr *addr = NULL, *peer;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004814 struct net_device *dev = NULL;
4815 struct inet6_ifaddr *ifa;
4816 struct sk_buff *skb;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004817 int err;
4818
Thomas Graf1b29fc22006-09-18 00:10:50 -07004819 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4820 if (err < 0)
4821 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004822
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00004823 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
Ian Morris63159f22015-03-29 14:00:04 +01004824 if (!addr) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004825 err = -EINVAL;
4826 goto errout;
4827 }
4828
4829 ifm = nlmsg_data(nlh);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004830 if (ifm->ifa_index)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004831 dev = __dev_get_by_index(net, ifm->ifa_index);
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004832
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004833 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4834 if (!ifa) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004835 err = -EADDRNOTAVAIL;
4836 goto errout;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004837 }
4838
Stephen Hemmingere21e8462010-03-20 16:09:01 -07004839 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4840 if (!skb) {
Thomas Graf1b29fc22006-09-18 00:10:50 -07004841 err = -ENOBUFS;
4842 goto errout_ifa;
4843 }
4844
Eric W. Biederman15e47302012-09-07 20:12:54 +00004845 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004846 nlh->nlmsg_seq, RTM_NEWADDR, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004847 if (err < 0) {
4848 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4849 WARN_ON(err == -EMSGSIZE);
4850 kfree_skb(skb);
4851 goto errout_ifa;
4852 }
Eric W. Biederman15e47302012-09-07 20:12:54 +00004853 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004854errout_ifa:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004855 in6_ifa_put(ifa);
Thomas Graf1b29fc22006-09-18 00:10:50 -07004856errout:
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004857 return err;
Noriaki TAKAMIYA6c223822006-07-28 18:12:12 +09004858}
4859
Linus Torvalds1da177e2005-04-16 15:20:36 -07004860static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4861{
4862 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09004863 struct net *net = dev_net(ifa->idev->dev);
Thomas Graf5d620262006-08-15 00:35:02 -07004864 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004865
Thomas Graf0ab68032006-09-18 00:12:35 -07004866 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01004867 if (!skb)
Thomas Graf5d620262006-08-15 00:35:02 -07004868 goto errout;
4869
4870 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08004871 if (err < 0) {
4872 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4873 WARN_ON(err == -EMSGSIZE);
4874 kfree_skb(skb);
4875 goto errout;
4876 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08004877 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4878 return;
Thomas Graf5d620262006-08-15 00:35:02 -07004879errout:
4880 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08004881 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004882}
4883
Dave Jonesb6f99a22007-03-22 12:27:49 -07004884static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004885 __s32 *array, int bytes)
4886{
Thomas Graf04561c12006-11-14 19:53:58 -08004887 BUG_ON(bytes < (DEVCONF_MAX * 4));
4888
Linus Torvalds1da177e2005-04-16 15:20:36 -07004889 memset(array, 0, bytes);
4890 array[DEVCONF_FORWARDING] = cnf->forwarding;
4891 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4892 array[DEVCONF_MTU6] = cnf->mtu6;
4893 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4894 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4895 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4896 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4897 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
Thomas Graf93908d12010-11-17 01:44:24 +00004898 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4899 jiffies_to_msecs(cnf->rtr_solicit_interval);
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07004900 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4901 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
Thomas Graf93908d12010-11-17 01:44:24 +00004902 array[DEVCONF_RTR_SOLICIT_DELAY] =
4903 jiffies_to_msecs(cnf->rtr_solicit_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004904 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
Hannes Frederic Sowafc4eba52013-08-14 01:03:46 +02004905 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4906 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4907 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4908 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004909 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4910 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4911 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4912 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4913 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004914 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
YOSHIFUJI Hideaki65f5c7c2006-03-20 16:55:08 -08004915 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
Hangbin Liu8013d1d72015-07-30 14:28:42 +08004916 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
YOSHIFUJI Hideakic4fd30e2006-03-20 16:55:26 -08004917 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08004918#ifdef CONFIG_IPV6_ROUTER_PREF
4919 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
Thomas Graf93908d12010-11-17 01:44:24 +00004920 array[DEVCONF_RTR_PROBE_INTERVAL] =
4921 jiffies_to_msecs(cnf->rtr_probe_interval);
Neil Hormanfa03ef32007-01-30 14:30:10 -08004922#ifdef CONFIG_IPV6_ROUTE_INFO
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08004923 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4924#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08004925#endif
YOSHIFUJI Hideakifbea49e2006-09-22 14:43:49 -07004926 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
YOSHIFUJI Hideaki0bcbc922007-04-24 14:58:30 -07004927 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
Neil Horman95c385b2007-04-25 17:08:10 -07004928#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4929 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
Erik Kline7fd25612014-10-28 18:11:14 +09004930 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
Neil Horman95c385b2007-04-25 17:08:10 -07004931#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09004932#ifdef CONFIG_IPV6_MROUTE
4933 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4934#endif
YOSHIFUJI Hideaki778d80b2008-06-28 14:17:11 +09004935 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
YOSHIFUJI Hideaki1b34be72008-06-28 14:18:38 +09004936 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
Cosmin Ratiuc3faca02009-10-09 03:11:14 +00004937 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
Hannes Frederic Sowa5cb04432012-11-06 16:46:20 +00004938 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
Hannes Frederic Sowab800c3b2013-08-27 01:36:51 +02004939 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
Ben Greeard9333192014-06-25 14:44:53 -07004940 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
Harout Hedeshianc2943f12015-01-20 10:06:05 -07004941 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
Andy Gospodarek35103d12015-08-13 10:39:01 -04004942 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01004943 /* we omit DEVCONF_STABLE_SECRET for now */
Erik Kline3985e8a2015-07-22 16:38:25 +09004944 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
Johannes Bergabbc3042016-02-04 13:31:19 +01004945 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
Johannes Berg7a02bf82016-02-04 13:31:20 +01004946 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
David Ahernf1705ec2016-02-24 09:25:37 -08004947 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004948}
4949
Thomas Grafb382b192010-11-16 04:33:57 +00004950static inline size_t inet6_ifla6_size(void)
4951{
4952 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4953 + nla_total_size(sizeof(struct ifla_cacheinfo))
4954 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4955 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
Daniel Borkmannf53adae2013-04-08 04:01:30 +00004956 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4957 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
Thomas Grafb382b192010-11-16 04:33:57 +00004958}
4959
Thomas Graf339bf982006-11-10 14:10:15 -08004960static inline size_t inet6_if_nlmsg_size(void)
4961{
4962 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4963 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4964 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4965 + nla_total_size(4) /* IFLA_MTU */
4966 + nla_total_size(4) /* IFLA_LINK */
Andy Gospodarek03443382015-08-13 15:26:35 -04004967 + nla_total_size(1) /* IFLA_OPERSTATE */
Thomas Grafb382b192010-11-16 04:33:57 +00004968 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
Thomas Graf339bf982006-11-10 14:10:15 -08004969}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07004970
Eric Dumazetbe281e52011-05-19 01:14:23 +00004971static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
Jia Heaca05672016-09-30 11:29:03 +08004972 int bytes)
Herbert Xu7f7d9a62007-04-24 21:54:09 -07004973{
4974 int i;
Jia Heaca05672016-09-30 11:29:03 +08004975 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
Herbert Xu7f7d9a62007-04-24 21:54:09 -07004976 BUG_ON(pad < 0);
4977
4978 /* Use put_unaligned() because stats may not be aligned for u64. */
Jia Heaca05672016-09-30 11:29:03 +08004979 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
4980 for (i = 1; i < ICMP6_MIB_MAX; i++)
Eric Dumazetbe281e52011-05-19 01:14:23 +00004981 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07004982
Jia Heaca05672016-09-30 11:29:03 +08004983 memset(&stats[ICMP6_MIB_MAX], 0, pad);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07004984}
4985
WANG Cong698365f2014-05-05 15:55:55 -07004986static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
Raghavendra K Ta3a77372015-08-30 11:29:42 +05304987 int bytes, size_t syncpoff)
Eric Dumazet4ce3c182010-06-30 13:31:19 -07004988{
Raghavendra K Ta3a77372015-08-30 11:29:42 +05304989 int i, c;
4990 u64 buff[IPSTATS_MIB_MAX];
4991 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4992
Eric Dumazet4ce3c182010-06-30 13:31:19 -07004993 BUG_ON(pad < 0);
4994
Raghavendra K Ta3a77372015-08-30 11:29:42 +05304995 memset(buff, 0, sizeof(buff));
4996 buff[0] = IPSTATS_MIB_MAX;
Eric Dumazet4ce3c182010-06-30 13:31:19 -07004997
Raghavendra K Ta3a77372015-08-30 11:29:42 +05304998 for_each_possible_cpu(c) {
4999 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5000 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5001 }
5002
5003 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5004 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
Eric Dumazet4ce3c182010-06-30 13:31:19 -07005005}
5006
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005007static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5008 int bytes)
5009{
Stephen Hemmingere21e8462010-03-20 16:09:01 -07005010 switch (attrtype) {
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005011 case IFLA_INET6_STATS:
Raghavendra K Ta3a77372015-08-30 11:29:42 +05305012 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5013 offsetof(struct ipstats_mib, syncp));
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005014 break;
5015 case IFLA_INET6_ICMP6STATS:
Jia Heaca05672016-09-30 11:29:03 +08005016 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
Herbert Xu7f7d9a62007-04-24 21:54:09 -07005017 break;
5018 }
5019}
5020
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005021static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5022 u32 ext_filter_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005023{
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005024 struct nlattr *nla;
Thomas Graf04561c12006-11-14 19:53:58 -08005025 struct ifla_cacheinfo ci;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005026
David S. Millerc78679e2012-04-01 20:27:33 -04005027 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5028 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005029 ci.max_reasm_len = IPV6_MAXPLEN;
David S. Miller24912422010-11-19 13:13:47 -08005030 ci.tstamp = cstamp_delta(idev->tstamp);
5031 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
Jiri Pirko1f9248e2013-12-07 19:26:53 +01005032 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
David S. Millerc78679e2012-04-01 20:27:33 -04005033 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5034 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005035 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
Ian Morris63159f22015-03-29 14:00:04 +01005036 if (!nla)
Thomas Graf04561c12006-11-14 19:53:58 -08005037 goto nla_put_failure;
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005038 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005039
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005040 /* XXX - MC not implemented */
5041
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005042 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5043 return 0;
5044
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005045 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005046 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005047 goto nla_put_failure;
5048 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5049
5050 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
Ian Morris63159f22015-03-29 14:00:04 +01005051 if (!nla)
YOSHIFUJI Hideakibf99f1b2007-04-20 15:56:20 -07005052 goto nla_put_failure;
5053 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005054
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005055 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
Ian Morris63159f22015-03-29 14:00:04 +01005056 if (!nla)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005057 goto nla_put_failure;
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005058
5059 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5060 goto nla_put_failure;
5061
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005062 read_lock_bh(&idev->lock);
5063 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5064 read_unlock_bh(&idev->lock);
5065
Thomas Grafb382b192010-11-16 04:33:57 +00005066 return 0;
5067
5068nla_put_failure:
5069 return -EMSGSIZE;
5070}
5071
Arad, Ronenb1974ed2015-10-19 09:23:28 -07005072static size_t inet6_get_link_af_size(const struct net_device *dev,
5073 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005074{
5075 if (!__in6_dev_get(dev))
5076 return 0;
5077
5078 return inet6_ifla6_size();
5079}
5080
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005081static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5082 u32 ext_filter_mask)
Thomas Grafb382b192010-11-16 04:33:57 +00005083{
5084 struct inet6_dev *idev = __in6_dev_get(dev);
5085
5086 if (!idev)
5087 return -ENODATA;
5088
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005089 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005090 return -EMSGSIZE;
5091
5092 return 0;
5093}
5094
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005095static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5096{
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005097 struct inet6_ifaddr *ifp;
5098 struct net_device *dev = idev->dev;
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005099 bool clear_token, update_rs = false;
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005100 struct in6_addr ll_addr;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005101
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005102 ASSERT_RTNL();
5103
Ian Morris63159f22015-03-29 14:00:04 +01005104 if (!token)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005105 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005106 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5107 return -EINVAL;
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005108 if (!ipv6_accept_ra(idev))
5109 return -EINVAL;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005110 if (idev->cnf.rtr_solicits == 0)
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005111 return -EINVAL;
5112
5113 write_lock_bh(&idev->lock);
5114
5115 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5116 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5117
5118 write_unlock_bh(&idev->lock);
5119
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005120 clear_token = ipv6_addr_any(token);
5121 if (clear_token)
5122 goto update_lft;
5123
Hannes Frederic Sowadc848292013-06-24 21:42:40 +02005124 if (!idev->dead && (idev->if_flags & IF_READY) &&
5125 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5126 IFA_F_OPTIMISTIC)) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005127 /* If we're not ready, then normal ifup will take care
5128 * of this. Otherwise, we need to request our rs here.
5129 */
5130 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5131 update_rs = true;
5132 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005133
Daniel Borkmann47e27d52016-04-08 15:55:00 +02005134update_lft:
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005135 write_lock_bh(&idev->lock);
Daniel Borkmannfc403832013-04-09 03:47:15 +00005136
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005137 if (update_rs) {
Daniel Borkmannfc403832013-04-09 03:47:15 +00005138 idev->if_flags |= IF_RS_SENT;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005139 idev->rs_interval = rfc3315_s14_backoff_init(
5140 idev->cnf.rtr_solicit_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005141 idev->rs_probes = 1;
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005142 addrconf_mod_rs_timer(idev, idev->rs_interval);
Hannes Frederic Sowa77ecaac2013-06-26 03:41:49 +02005143 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005144
5145 /* Well, that's kinda nasty ... */
5146 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5147 spin_lock(&ifp->lock);
Daniel Borkmann617fe292013-04-09 03:47:16 +00005148 if (ifp->tokenized) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005149 ifp->valid_lft = 0;
5150 ifp->prefered_lft = 0;
5151 }
5152 spin_unlock(&ifp->lock);
5153 }
5154
5155 write_unlock_bh(&idev->lock);
Lubomir Rintelb2ed64a2014-10-27 17:39:16 +01005156 inet6_ifinfo_notify(RTM_NEWLINK, idev);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005157 addrconf_verify_rtnl();
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005158 return 0;
5159}
5160
Daniel Borkmann11b1f822015-02-05 14:39:11 +01005161static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5162 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5163 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5164};
5165
5166static int inet6_validate_link_af(const struct net_device *dev,
5167 const struct nlattr *nla)
5168{
5169 struct nlattr *tb[IFLA_INET6_MAX + 1];
5170
5171 if (dev && !__in6_dev_get(dev))
5172 return -EAFNOSUPPORT;
5173
5174 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5175}
5176
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005177static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5178{
5179 int err = -EINVAL;
5180 struct inet6_dev *idev = __in6_dev_get(dev);
5181 struct nlattr *tb[IFLA_INET6_MAX + 1];
5182
5183 if (!idev)
5184 return -EAFNOSUPPORT;
5185
5186 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5187 BUG();
5188
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005189 if (tb[IFLA_INET6_TOKEN]) {
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005190 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005191 if (err)
5192 return err;
5193 }
5194
5195 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5196 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5197
5198 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005199 mode != IN6_ADDR_GEN_MODE_NONE &&
Bjørn Morkcc9da6c2015-12-16 16:44:38 +01005200 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5201 mode != IN6_ADDR_GEN_MODE_RANDOM)
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005202 return -EINVAL;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005203
5204 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5205 !idev->cnf.stable_secret.initialized &&
5206 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5207 return -EINVAL;
5208
Jiri Pirkobc91b0f2014-07-11 21:10:18 +02005209 idev->addr_gen_mode = mode;
5210 err = 0;
5211 }
Daniel Borkmannf53adae2013-04-08 04:01:30 +00005212
5213 return err;
5214}
5215
Thomas Grafb382b192010-11-16 04:33:57 +00005216static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005217 u32 portid, u32 seq, int event, unsigned int flags)
Thomas Grafb382b192010-11-16 04:33:57 +00005218{
5219 struct net_device *dev = idev->dev;
5220 struct ifinfomsg *hdr;
5221 struct nlmsghdr *nlh;
5222 void *protoinfo;
5223
Eric W. Biederman15e47302012-09-07 20:12:54 +00005224 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005225 if (!nlh)
Thomas Grafb382b192010-11-16 04:33:57 +00005226 return -EMSGSIZE;
5227
5228 hdr = nlmsg_data(nlh);
5229 hdr->ifi_family = AF_INET6;
5230 hdr->__ifi_pad = 0;
5231 hdr->ifi_type = dev->type;
5232 hdr->ifi_index = dev->ifindex;
5233 hdr->ifi_flags = dev_get_flags(dev);
5234 hdr->ifi_change = 0;
5235
David S. Millerc78679e2012-04-01 20:27:33 -04005236 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5237 (dev->addr_len &&
5238 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5239 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
Nicolas Dichtela54acb32015-04-02 17:07:00 +02005240 (dev->ifindex != dev_get_iflink(dev) &&
Andy Gospodarek03443382015-08-13 15:26:35 -04005241 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5242 nla_put_u8(skb, IFLA_OPERSTATE,
5243 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
David S. Millerc78679e2012-04-01 20:27:33 -04005244 goto nla_put_failure;
Thomas Grafb382b192010-11-16 04:33:57 +00005245 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
Ian Morris63159f22015-03-29 14:00:04 +01005246 if (!protoinfo)
Thomas Grafb382b192010-11-16 04:33:57 +00005247 goto nla_put_failure;
5248
Sowmini Varadhand5566fd2015-09-11 16:48:48 -04005249 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
Thomas Grafb382b192010-11-16 04:33:57 +00005250 goto nla_put_failure;
5251
Thomas Graf04561c12006-11-14 19:53:58 -08005252 nla_nest_end(skb, protoinfo);
Johannes Berg053c0952015-01-16 22:09:00 +01005253 nlmsg_end(skb, nlh);
5254 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005255
Thomas Graf04561c12006-11-14 19:53:58 -08005256nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005257 nlmsg_cancel(skb, nlh);
5258 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005259}
5260
5261static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5262{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09005263 struct net *net = sock_net(skb->sk);
Eric Dumazet84d26972009-11-09 12:11:28 +00005264 int h, s_h;
David S. Miller434a8a52009-11-11 18:53:00 -08005265 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005266 struct net_device *dev;
5267 struct inet6_dev *idev;
Eric Dumazet84d26972009-11-09 12:11:28 +00005268 struct hlist_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005269
Eric Dumazet84d26972009-11-09 12:11:28 +00005270 s_h = cb->args[0];
5271 s_idx = cb->args[1];
5272
5273 rcu_read_lock();
5274 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5275 idx = 0;
5276 head = &net->dev_index_head[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -08005277 hlist_for_each_entry_rcu(dev, head, index_hlist) {
Eric Dumazet84d26972009-11-09 12:11:28 +00005278 if (idx < s_idx)
5279 goto cont;
5280 idev = __in6_dev_get(dev);
5281 if (!idev)
5282 goto cont;
5283 if (inet6_fill_ifinfo(skb, idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005284 NETLINK_CB(cb->skb).portid,
Eric Dumazet84d26972009-11-09 12:11:28 +00005285 cb->nlh->nlmsg_seq,
Johannes Berg053c0952015-01-16 22:09:00 +01005286 RTM_NEWLINK, NLM_F_MULTI) < 0)
Eric Dumazet84d26972009-11-09 12:11:28 +00005287 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -07005288cont:
Eric Dumazet84d26972009-11-09 12:11:28 +00005289 idx++;
5290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005291 }
Eric Dumazet84d26972009-11-09 12:11:28 +00005292out:
5293 rcu_read_unlock();
5294 cb->args[1] = idx;
5295 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005296
5297 return skb->len;
5298}
5299
5300void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5301{
5302 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005303 struct net *net = dev_net(idev->dev);
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005304 int err = -ENOBUFS;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005305
Thomas Graf339bf982006-11-10 14:10:15 -08005306 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005307 if (!skb)
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005308 goto errout;
5309
5310 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005311 if (err < 0) {
5312 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5313 WARN_ON(err == -EMSGSIZE);
5314 kfree_skb(skb);
5315 goto errout;
5316 }
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005317 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005318 return;
Thomas Graf8d7a76c2006-08-15 00:35:47 -07005319errout:
5320 if (err < 0)
Nicolas Dichtel5f75a102010-12-07 23:38:31 +00005321 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005322}
5323
Thomas Graf339bf982006-11-10 14:10:15 -08005324static inline size_t inet6_prefix_nlmsg_size(void)
5325{
5326 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5327 + nla_total_size(sizeof(struct in6_addr))
5328 + nla_total_size(sizeof(struct prefix_cacheinfo));
5329}
YOSHIFUJI Hideakic5396a32006-06-17 22:48:48 -07005330
Linus Torvalds1da177e2005-04-16 15:20:36 -07005331static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
Eric W. Biederman15e47302012-09-07 20:12:54 +00005332 struct prefix_info *pinfo, u32 portid, u32 seq,
Thomas Graf6051e2f2006-11-14 19:54:19 -08005333 int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005334{
Thomas Graf6051e2f2006-11-14 19:54:19 -08005335 struct prefixmsg *pmsg;
5336 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005337 struct prefix_cacheinfo ci;
5338
Eric W. Biederman15e47302012-09-07 20:12:54 +00005339 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
Ian Morris63159f22015-03-29 14:00:04 +01005340 if (!nlh)
Patrick McHardy26932562007-01-31 23:16:40 -08005341 return -EMSGSIZE;
Thomas Graf6051e2f2006-11-14 19:54:19 -08005342
5343 pmsg = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005344 pmsg->prefix_family = AF_INET6;
Patrick McHardy8a470772005-06-28 12:56:45 -07005345 pmsg->prefix_pad1 = 0;
5346 pmsg->prefix_pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005347 pmsg->prefix_ifindex = idev->dev->ifindex;
5348 pmsg->prefix_len = pinfo->prefix_len;
5349 pmsg->prefix_type = pinfo->type;
Patrick McHardy8a470772005-06-28 12:56:45 -07005350 pmsg->prefix_pad3 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005351 pmsg->prefix_flags = 0;
5352 if (pinfo->onlink)
5353 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5354 if (pinfo->autoconf)
5355 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5356
David S. Millerc78679e2012-04-01 20:27:33 -04005357 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5358 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005359 ci.preferred_time = ntohl(pinfo->prefered);
5360 ci.valid_time = ntohl(pinfo->valid);
David S. Millerc78679e2012-04-01 20:27:33 -04005361 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5362 goto nla_put_failure;
Johannes Berg053c0952015-01-16 22:09:00 +01005363 nlmsg_end(skb, nlh);
5364 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005365
Thomas Graf6051e2f2006-11-14 19:54:19 -08005366nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08005367 nlmsg_cancel(skb, nlh);
5368 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005369}
5370
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005371static void inet6_prefix_notify(int event, struct inet6_dev *idev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005372 struct prefix_info *pinfo)
5373{
5374 struct sk_buff *skb;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09005375 struct net *net = dev_net(idev->dev);
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005376 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005377
Thomas Graf339bf982006-11-10 14:10:15 -08005378 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
Ian Morris63159f22015-03-29 14:00:04 +01005379 if (!skb)
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005380 goto errout;
5381
5382 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08005383 if (err < 0) {
5384 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5385 WARN_ON(err == -EMSGSIZE);
5386 kfree_skb(skb);
5387 goto errout;
5388 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08005389 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5390 return;
Thomas Graf8c384bfa2006-08-15 00:36:07 -07005391errout:
5392 if (err < 0)
Benjamin Thery6fda7352008-03-05 10:47:47 -08005393 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005394}
5395
Linus Torvalds1da177e2005-04-16 15:20:36 -07005396static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5397{
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005398 struct net *net = dev_net(ifp->idev->dev);
5399
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01005400 if (event)
5401 ASSERT_RTNL();
5402
Linus Torvalds1da177e2005-04-16 15:20:36 -07005403 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5404
5405 switch (event) {
5406 case RTM_NEWADDR:
Neil Horman95c385b2007-04-25 17:08:10 -07005407 /*
5408 * If the address was optimistic
5409 * we inserted the route at the start of
5410 * our DAD process, so we don't need
5411 * to do it again
5412 */
5413 if (!(ifp->rt->rt6i_node))
5414 ip6_ins_rt(ifp->rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005415 if (ifp->idev->cnf.forwarding)
5416 addrconf_join_anycast(ifp);
Cong Wang7996c792013-05-22 05:41:06 +00005417 if (!ipv6_addr_any(&ifp->peer_addr))
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005418 addrconf_prefix_route(&ifp->peer_addr, 128,
5419 ifp->idev->dev, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005420 break;
5421 case RTM_DELADDR:
5422 if (ifp->idev->cnf.forwarding)
5423 addrconf_leave_anycast(ifp);
5424 addrconf_leave_solict(ifp->idev, &ifp->addr);
Cong Wang7996c792013-05-22 05:41:06 +00005425 if (!ipv6_addr_any(&ifp->peer_addr)) {
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005426 struct rt6_info *rt;
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005427
Nicolas Dichtele7478df2014-09-03 23:59:22 +02005428 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5429 ifp->idev->dev, 0, 0);
Martin KaFai Lau8e3d5be2015-09-15 14:30:08 -07005430 if (rt)
5431 ip6_del_rt(rt);
Nicolas Dichtelcaeaba72013-05-16 22:32:00 +00005432 }
David Ahern38bd10c2016-04-21 20:56:12 -07005433 if (ifp->rt) {
5434 dst_hold(&ifp->rt->dst);
5435 ip6_del_rt(ifp->rt);
5436 }
Hannes Frederic Sowa705f1c82014-09-28 00:46:06 +02005437 rt_genid_bump_ipv6(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005438 break;
5439 }
Nicolas Dichtel63998ac2013-03-22 06:28:43 +00005440 atomic_inc(&net->ipv6.dev_addr_genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005441}
5442
5443static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5444{
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005445 rcu_read_lock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005446 if (likely(ifp->idev->dead == 0))
5447 __ipv6_ifa_notify(event, ifp);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -07005448 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005449}
5450
5451#ifdef CONFIG_SYSCTL
5452
5453static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005454int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005455 void __user *buffer, size_t *lenp, loff_t *ppos)
5456{
5457 int *valp = ctl->data;
5458 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005459 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005460 struct ctl_table lctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005461 int ret;
5462
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005463 /*
5464 * ctl->data points to idev->cnf.forwarding, we should
5465 * not modify it until we get the rtnl lock.
5466 */
5467 lctl = *ctl;
5468 lctl.data = &val;
5469
5470 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005471
Pavel Emelyanovc8fecf22007-12-05 01:50:24 -08005472 if (write)
Stephen Hemmingerb325fdd2009-02-26 06:55:31 +00005473 ret = addrconf_fixup_forwarding(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005474 if (ret)
5475 *ppos = pos;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09005476 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005477}
5478
Marcelo Leitner77751422015-02-23 11:17:13 -03005479static
5480int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5481 void __user *buffer, size_t *lenp, loff_t *ppos)
5482{
5483 struct inet6_dev *idev = ctl->extra1;
5484 int min_mtu = IPV6_MIN_MTU;
5485 struct ctl_table lctl;
5486
5487 lctl = *ctl;
5488 lctl.extra1 = &min_mtu;
5489 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5490
5491 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5492}
5493
Brian Haley56d417b2009-06-01 03:07:33 -07005494static void dev_disable_change(struct inet6_dev *idev)
5495{
Cong Wang75538c22013-05-29 11:30:50 +08005496 struct netdev_notifier_info info;
5497
Brian Haley56d417b2009-06-01 03:07:33 -07005498 if (!idev || !idev->dev)
5499 return;
5500
Cong Wang75538c22013-05-29 11:30:50 +08005501 netdev_notifier_info_init(&info, idev->dev);
Brian Haley56d417b2009-06-01 03:07:33 -07005502 if (idev->cnf.disable_ipv6)
Cong Wang75538c22013-05-29 11:30:50 +08005503 addrconf_notify(NULL, NETDEV_DOWN, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005504 else
Cong Wang75538c22013-05-29 11:30:50 +08005505 addrconf_notify(NULL, NETDEV_UP, &info);
Brian Haley56d417b2009-06-01 03:07:33 -07005506}
5507
5508static void addrconf_disable_change(struct net *net, __s32 newf)
5509{
5510 struct net_device *dev;
5511 struct inet6_dev *idev;
5512
Eric Dumazetc6d14c82009-11-04 05:43:23 -08005513 rcu_read_lock();
5514 for_each_netdev_rcu(net, dev) {
Brian Haley56d417b2009-06-01 03:07:33 -07005515 idev = __in6_dev_get(dev);
5516 if (idev) {
5517 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5518 idev->cnf.disable_ipv6 = newf;
5519 if (changed)
5520 dev_disable_change(idev);
5521 }
Brian Haley56d417b2009-06-01 03:07:33 -07005522 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -08005523 rcu_read_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005524}
5525
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005526static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
Brian Haley56d417b2009-06-01 03:07:33 -07005527{
5528 struct net *net;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005529 int old;
5530
5531 if (!rtnl_trylock())
5532 return restart_syscall();
Brian Haley56d417b2009-06-01 03:07:33 -07005533
5534 net = (struct net *)table->extra2;
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005535 old = *p;
5536 *p = newf;
Brian Haley56d417b2009-06-01 03:07:33 -07005537
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005538 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5539 rtnl_unlock();
Brian Haley56d417b2009-06-01 03:07:33 -07005540 return 0;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005541 }
Brian Haley56d417b2009-06-01 03:07:33 -07005542
5543 if (p == &net->ipv6.devconf_all->disable_ipv6) {
Brian Haley56d417b2009-06-01 03:07:33 -07005544 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5545 addrconf_disable_change(net, newf);
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005546 } else if ((!newf) ^ (!old))
Brian Haley56d417b2009-06-01 03:07:33 -07005547 dev_disable_change((struct inet6_dev *)table->extra1);
5548
5549 rtnl_unlock();
5550 return 0;
5551}
5552
5553static
Joe Perchesfe2c6332013-06-11 23:04:25 -07005554int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
Brian Haley56d417b2009-06-01 03:07:33 -07005555 void __user *buffer, size_t *lenp, loff_t *ppos)
5556{
5557 int *valp = ctl->data;
5558 int val = *valp;
Eric W. Biederman88af1822010-02-19 13:22:59 +00005559 loff_t pos = *ppos;
Joe Perchesfe2c6332013-06-11 23:04:25 -07005560 struct ctl_table lctl;
Brian Haley56d417b2009-06-01 03:07:33 -07005561 int ret;
5562
Francesco Ruggeri013d97e2012-01-16 10:40:10 +00005563 /*
5564 * ctl->data points to idev->cnf.disable_ipv6, we should
5565 * not modify it until we get the rtnl lock.
5566 */
5567 lctl = *ctl;
5568 lctl.data = &val;
5569
5570 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
Brian Haley56d417b2009-06-01 03:07:33 -07005571
5572 if (write)
5573 ret = addrconf_disable_ipv6(ctl, valp, val);
Eric W. Biederman88af1822010-02-19 13:22:59 +00005574 if (ret)
5575 *ppos = pos;
Brian Haley56d417b2009-06-01 03:07:33 -07005576 return ret;
5577}
5578
stephen hemmingerc92d5492013-12-17 22:37:14 -08005579static
5580int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5581 void __user *buffer, size_t *lenp, loff_t *ppos)
5582{
5583 int *valp = ctl->data;
5584 int ret;
5585 int old, new;
5586
5587 old = *valp;
5588 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5589 new = *valp;
5590
5591 if (write && old != new) {
5592 struct net *net = ctl->extra2;
5593
5594 if (!rtnl_trylock())
5595 return restart_syscall();
5596
5597 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5598 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5599 NETCONFA_IFINDEX_DEFAULT,
5600 net->ipv6.devconf_dflt);
5601 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5602 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5603 NETCONFA_IFINDEX_ALL,
5604 net->ipv6.devconf_all);
5605 else {
5606 struct inet6_dev *idev = ctl->extra1;
5607
5608 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5609 idev->dev->ifindex,
5610 &idev->cnf);
5611 }
5612 rtnl_unlock();
5613 }
5614
5615 return ret;
5616}
5617
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005618static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5619 void __user *buffer, size_t *lenp,
5620 loff_t *ppos)
5621{
5622 int err;
5623 struct in6_addr addr;
5624 char str[IPV6_MAX_STRLEN];
5625 struct ctl_table lctl = *ctl;
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005626 struct net *net = ctl->extra2;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005627 struct ipv6_stable_secret *secret = ctl->data;
5628
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005629 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5630 return -EIO;
5631
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005632 lctl.maxlen = IPV6_MAX_STRLEN;
5633 lctl.data = str;
5634
5635 if (!rtnl_trylock())
5636 return restart_syscall();
5637
5638 if (!write && !secret->initialized) {
5639 err = -EIO;
5640 goto out;
5641 }
5642
WANG Cong5449a5c2015-12-21 10:55:45 -08005643 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5644 if (err >= sizeof(str)) {
5645 err = -EIO;
5646 goto out;
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005647 }
5648
5649 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5650 if (err || !write)
5651 goto out;
5652
5653 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5654 err = -EIO;
5655 goto out;
5656 }
5657
5658 secret->initialized = true;
5659 secret->secret = addr;
5660
Hannes Frederic Sowa622c81d52015-03-23 23:36:01 +01005661 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5662 struct net_device *dev;
5663
5664 for_each_netdev(net, dev) {
5665 struct inet6_dev *idev = __in6_dev_get(dev);
5666
5667 if (idev) {
5668 idev->addr_gen_mode =
5669 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5670 }
5671 }
5672 } else {
5673 struct inet6_dev *idev = ctl->extra1;
5674
5675 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5676 }
5677
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01005678out:
5679 rtnl_unlock();
5680
5681 return err;
5682}
stephen hemmingerc92d5492013-12-17 22:37:14 -08005683
Andy Gospodarek35103d12015-08-13 10:39:01 -04005684static
5685int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5686 int write,
5687 void __user *buffer,
5688 size_t *lenp,
5689 loff_t *ppos)
5690{
5691 int *valp = ctl->data;
5692 int val = *valp;
5693 loff_t pos = *ppos;
5694 struct ctl_table lctl;
5695 int ret;
5696
5697 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5698 * we should not modify it until we get the rtnl lock.
5699 */
5700 lctl = *ctl;
5701 lctl.data = &val;
5702
5703 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5704
5705 if (write)
5706 ret = addrconf_fixup_linkdown(ctl, valp, val);
5707 if (ret)
5708 *ppos = pos;
5709 return ret;
5710}
5711
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005712static int minus_one = -1;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005713static const int one = 1;
5714static const int two_five_five = 255;
5715
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03005716static const struct ctl_table addrconf_sysctl[] = {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005717 {
5718 .procname = "forwarding",
5719 .data = &ipv6_devconf.forwarding,
5720 .maxlen = sizeof(int),
5721 .mode = 0644,
5722 .proc_handler = addrconf_sysctl_forward,
5723 },
5724 {
5725 .procname = "hop_limit",
5726 .data = &ipv6_devconf.hop_limit,
5727 .maxlen = sizeof(int),
5728 .mode = 0644,
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07005729 .proc_handler = proc_dointvec_minmax,
5730 .extra1 = (void *)&one,
5731 .extra2 = (void *)&two_five_five,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005732 },
5733 {
5734 .procname = "mtu",
5735 .data = &ipv6_devconf.mtu6,
5736 .maxlen = sizeof(int),
5737 .mode = 0644,
5738 .proc_handler = addrconf_sysctl_mtu,
5739 },
5740 {
5741 .procname = "accept_ra",
5742 .data = &ipv6_devconf.accept_ra,
5743 .maxlen = sizeof(int),
5744 .mode = 0644,
5745 .proc_handler = proc_dointvec,
5746 },
5747 {
5748 .procname = "accept_redirects",
5749 .data = &ipv6_devconf.accept_redirects,
5750 .maxlen = sizeof(int),
5751 .mode = 0644,
5752 .proc_handler = proc_dointvec,
5753 },
5754 {
5755 .procname = "autoconf",
5756 .data = &ipv6_devconf.autoconf,
5757 .maxlen = sizeof(int),
5758 .mode = 0644,
5759 .proc_handler = proc_dointvec,
5760 },
5761 {
5762 .procname = "dad_transmits",
5763 .data = &ipv6_devconf.dad_transmits,
5764 .maxlen = sizeof(int),
5765 .mode = 0644,
5766 .proc_handler = proc_dointvec,
5767 },
5768 {
5769 .procname = "router_solicitations",
5770 .data = &ipv6_devconf.rtr_solicits,
5771 .maxlen = sizeof(int),
5772 .mode = 0644,
Maciej Żenczykowskicb4a4c62016-10-07 01:00:49 -07005773 .proc_handler = proc_dointvec_minmax,
5774 .extra1 = &minus_one,
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005775 },
5776 {
5777 .procname = "router_solicitation_interval",
5778 .data = &ipv6_devconf.rtr_solicit_interval,
5779 .maxlen = sizeof(int),
5780 .mode = 0644,
5781 .proc_handler = proc_dointvec_jiffies,
5782 },
5783 {
Maciej Żenczykowskibd11f072016-09-27 23:57:58 -07005784 .procname = "router_solicitation_max_interval",
5785 .data = &ipv6_devconf.rtr_solicit_max_interval,
5786 .maxlen = sizeof(int),
5787 .mode = 0644,
5788 .proc_handler = proc_dointvec_jiffies,
5789 },
5790 {
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005791 .procname = "router_solicitation_delay",
5792 .data = &ipv6_devconf.rtr_solicit_delay,
5793 .maxlen = sizeof(int),
5794 .mode = 0644,
5795 .proc_handler = proc_dointvec_jiffies,
5796 },
5797 {
5798 .procname = "force_mld_version",
5799 .data = &ipv6_devconf.force_mld_version,
5800 .maxlen = sizeof(int),
5801 .mode = 0644,
5802 .proc_handler = proc_dointvec,
5803 },
5804 {
5805 .procname = "mldv1_unsolicited_report_interval",
5806 .data =
5807 &ipv6_devconf.mldv1_unsolicited_report_interval,
5808 .maxlen = sizeof(int),
5809 .mode = 0644,
5810 .proc_handler = proc_dointvec_ms_jiffies,
5811 },
5812 {
5813 .procname = "mldv2_unsolicited_report_interval",
5814 .data =
5815 &ipv6_devconf.mldv2_unsolicited_report_interval,
5816 .maxlen = sizeof(int),
5817 .mode = 0644,
5818 .proc_handler = proc_dointvec_ms_jiffies,
5819 },
5820 {
5821 .procname = "use_tempaddr",
5822 .data = &ipv6_devconf.use_tempaddr,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = proc_dointvec,
5826 },
5827 {
5828 .procname = "temp_valid_lft",
5829 .data = &ipv6_devconf.temp_valid_lft,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
5834 {
5835 .procname = "temp_prefered_lft",
5836 .data = &ipv6_devconf.temp_prefered_lft,
5837 .maxlen = sizeof(int),
5838 .mode = 0644,
5839 .proc_handler = proc_dointvec,
5840 },
5841 {
5842 .procname = "regen_max_retry",
5843 .data = &ipv6_devconf.regen_max_retry,
5844 .maxlen = sizeof(int),
5845 .mode = 0644,
5846 .proc_handler = proc_dointvec,
5847 },
5848 {
5849 .procname = "max_desync_factor",
5850 .data = &ipv6_devconf.max_desync_factor,
5851 .maxlen = sizeof(int),
5852 .mode = 0644,
5853 .proc_handler = proc_dointvec,
5854 },
5855 {
5856 .procname = "max_addresses",
5857 .data = &ipv6_devconf.max_addresses,
5858 .maxlen = sizeof(int),
5859 .mode = 0644,
5860 .proc_handler = proc_dointvec,
5861 },
5862 {
5863 .procname = "accept_ra_defrtr",
5864 .data = &ipv6_devconf.accept_ra_defrtr,
5865 .maxlen = sizeof(int),
5866 .mode = 0644,
5867 .proc_handler = proc_dointvec,
5868 },
5869 {
5870 .procname = "accept_ra_min_hop_limit",
5871 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5872 .maxlen = sizeof(int),
5873 .mode = 0644,
5874 .proc_handler = proc_dointvec,
5875 },
5876 {
5877 .procname = "accept_ra_pinfo",
5878 .data = &ipv6_devconf.accept_ra_pinfo,
5879 .maxlen = sizeof(int),
5880 .mode = 0644,
5881 .proc_handler = proc_dointvec,
5882 },
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005883#ifdef CONFIG_IPV6_ROUTER_PREF
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005884 {
5885 .procname = "accept_ra_rtr_pref",
5886 .data = &ipv6_devconf.accept_ra_rtr_pref,
5887 .maxlen = sizeof(int),
5888 .mode = 0644,
5889 .proc_handler = proc_dointvec,
5890 },
5891 {
5892 .procname = "router_probe_interval",
5893 .data = &ipv6_devconf.rtr_probe_interval,
5894 .maxlen = sizeof(int),
5895 .mode = 0644,
5896 .proc_handler = proc_dointvec_jiffies,
5897 },
Neil Hormanfa03ef32007-01-30 14:30:10 -08005898#ifdef CONFIG_IPV6_ROUTE_INFO
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005899 {
5900 .procname = "accept_ra_rt_info_max_plen",
5901 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5902 .maxlen = sizeof(int),
5903 .mode = 0644,
5904 .proc_handler = proc_dointvec,
5905 },
YOSHIFUJI Hideaki09c884d2006-03-20 17:07:03 -08005906#endif
YOSHIFUJI Hideaki930d6ff2006-03-20 17:05:30 -08005907#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005908 {
5909 .procname = "proxy_ndp",
5910 .data = &ipv6_devconf.proxy_ndp,
5911 .maxlen = sizeof(int),
5912 .mode = 0644,
5913 .proc_handler = addrconf_sysctl_proxy_ndp,
5914 },
5915 {
5916 .procname = "accept_source_route",
5917 .data = &ipv6_devconf.accept_source_route,
5918 .maxlen = sizeof(int),
5919 .mode = 0644,
5920 .proc_handler = proc_dointvec,
5921 },
Neil Horman95c385b2007-04-25 17:08:10 -07005922#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005923 {
5924 .procname = "optimistic_dad",
5925 .data = &ipv6_devconf.optimistic_dad,
5926 .maxlen = sizeof(int),
5927 .mode = 0644,
5928 .proc_handler = proc_dointvec,
5929 },
5930 {
5931 .procname = "use_optimistic",
5932 .data = &ipv6_devconf.use_optimistic,
5933 .maxlen = sizeof(int),
5934 .mode = 0644,
5935 .proc_handler = proc_dointvec,
5936 },
Neil Horman95c385b2007-04-25 17:08:10 -07005937#endif
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005938#ifdef CONFIG_IPV6_MROUTE
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005939 {
5940 .procname = "mc_forwarding",
5941 .data = &ipv6_devconf.mc_forwarding,
5942 .maxlen = sizeof(int),
5943 .mode = 0444,
5944 .proc_handler = proc_dointvec,
5945 },
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +09005946#endif
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03005947 {
5948 .procname = "disable_ipv6",
5949 .data = &ipv6_devconf.disable_ipv6,
5950 .maxlen = sizeof(int),
5951 .mode = 0644,
5952 .proc_handler = addrconf_sysctl_disable,
5953 },
5954 {
5955 .procname = "accept_dad",
5956 .data = &ipv6_devconf.accept_dad,
5957 .maxlen = sizeof(int),
5958 .mode = 0644,
5959 .proc_handler = proc_dointvec,
5960 },
5961 {
5962 .procname = "force_tllao",
5963 .data = &ipv6_devconf.force_tllao,
5964 .maxlen = sizeof(int),
5965 .mode = 0644,
5966 .proc_handler = proc_dointvec
5967 },
5968 {
5969 .procname = "ndisc_notify",
5970 .data = &ipv6_devconf.ndisc_notify,
5971 .maxlen = sizeof(int),
5972 .mode = 0644,
5973 .proc_handler = proc_dointvec
5974 },
5975 {
5976 .procname = "suppress_frag_ndisc",
5977 .data = &ipv6_devconf.suppress_frag_ndisc,
5978 .maxlen = sizeof(int),
5979 .mode = 0644,
5980 .proc_handler = proc_dointvec
5981 },
5982 {
5983 .procname = "accept_ra_from_local",
5984 .data = &ipv6_devconf.accept_ra_from_local,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = proc_dointvec,
5988 },
5989 {
5990 .procname = "accept_ra_mtu",
5991 .data = &ipv6_devconf.accept_ra_mtu,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "stable_secret",
5998 .data = &ipv6_devconf.stable_secret,
5999 .maxlen = IPV6_MAX_STRLEN,
6000 .mode = 0600,
6001 .proc_handler = addrconf_sysctl_stable_secret,
6002 },
6003 {
6004 .procname = "use_oif_addrs_only",
6005 .data = &ipv6_devconf.use_oif_addrs_only,
6006 .maxlen = sizeof(int),
6007 .mode = 0644,
6008 .proc_handler = proc_dointvec,
6009 },
6010 {
6011 .procname = "ignore_routes_with_linkdown",
6012 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6013 .maxlen = sizeof(int),
6014 .mode = 0644,
6015 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6016 },
6017 {
6018 .procname = "drop_unicast_in_l2_multicast",
6019 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6020 .maxlen = sizeof(int),
6021 .mode = 0644,
6022 .proc_handler = proc_dointvec,
6023 },
6024 {
6025 .procname = "drop_unsolicited_na",
6026 .data = &ipv6_devconf.drop_unsolicited_na,
6027 .maxlen = sizeof(int),
6028 .mode = 0644,
6029 .proc_handler = proc_dointvec,
6030 },
6031 {
6032 .procname = "keep_addr_on_down",
6033 .data = &ipv6_devconf.keep_addr_on_down,
6034 .maxlen = sizeof(int),
6035 .mode = 0644,
6036 .proc_handler = proc_dointvec,
David Ahernf1705ec2016-02-24 09:25:37 -08006037
Konstantin Khlebnikov5df1f772016-04-18 14:41:17 +03006038 },
6039 {
6040 /* sentinel */
6041 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006042};
6043
Pavel Emelyanovbff16c22008-01-10 17:42:13 -08006044static int __addrconf_sysctl_register(struct net *net, char *dev_name,
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006045 struct inet6_dev *idev, struct ipv6_devconf *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006046{
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006047 int i, ifindex;
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006048 struct ctl_table *table;
Eric W. Biederman6105e292012-04-19 13:41:24 +00006049 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
Pavel Emelyanov1dab6222007-12-02 00:59:38 +11006050
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006051 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6052 if (!table)
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006053 goto out;
6054
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006055 for (i = 0; table[i].data; i++) {
6056 table[i].data += (char *)p - (char *)&ipv6_devconf;
Maciej Żenczykowskicb9e6842016-09-29 00:33:43 -07006057 /* If one of these is already set, then it is not safe to
6058 * overwrite either of them: this makes proc_dointvec_minmax
6059 * usable.
6060 */
6061 if (!table[i].extra1 && !table[i].extra2) {
6062 table[i].extra1 = idev; /* embedded; no ref */
6063 table[i].extra2 = net;
6064 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006065 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006066
Eric W. Biederman6105e292012-04-19 13:41:24 +00006067 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006068
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006069 p->sysctl_header = register_net_sysctl(net, path, table);
6070 if (!p->sysctl_header)
Eric W. Biederman6105e292012-04-19 13:41:24 +00006071 goto free;
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006072
Nicolas Dichtel29c994e2016-08-30 10:09:22 +02006073 if (!strcmp(dev_name, "all"))
6074 ifindex = NETCONFA_IFINDEX_ALL;
6075 else if (!strcmp(dev_name, "default"))
6076 ifindex = NETCONFA_IFINDEX_DEFAULT;
6077 else
6078 ifindex = idev->dev->ifindex;
6079 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
Pavel Emelyanov95897312008-01-10 17:41:45 -08006080 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006081
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006082free:
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006083 kfree(table);
Pavel Emelyanovf68635e2007-12-02 00:21:52 +11006084out:
Pavel Emelyanov95897312008-01-10 17:41:45 -08006085 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006086}
6087
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006088static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6089{
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006090 struct ctl_table *table;
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006091
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006092 if (!p->sysctl_header)
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006093 return;
6094
Konstantin Khlebnikov607ea7c2016-04-18 14:41:10 +03006095 table = p->sysctl_header->ctl_table_arg;
6096 unregister_net_sysctl_table(p->sysctl_header);
6097 p->sysctl_header = NULL;
6098 kfree(table);
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006099}
6100
WANG Conga317a2f2014-07-25 15:25:09 -07006101static int addrconf_sysctl_register(struct inet6_dev *idev)
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006102{
WANG Conga317a2f2014-07-25 15:25:09 -07006103 int err;
6104
6105 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6106 return -EINVAL;
6107
6108 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6109 &ndisc_ifinfo_sysctl_change);
6110 if (err)
6111 return err;
6112 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6113 idev, &idev->cnf);
6114 if (err)
6115 neigh_sysctl_unregister(idev->nd_parms);
6116
6117 return err;
Pavel Emelyanovf52295a2007-12-02 00:58:37 +11006118}
6119
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006120static void addrconf_sysctl_unregister(struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006121{
Pavel Emelyanov408c4762008-01-10 17:41:21 -08006122 __addrconf_sysctl_unregister(&idev->cnf);
6123 neigh_sysctl_unregister(idev->nd_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006124}
6125
6126
6127#endif
6128
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006129static int __net_init addrconf_init_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006130{
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006131 int err = -ENOMEM;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006132 struct ipv6_devconf *all, *dflt;
6133
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006134 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006135 if (!all)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006136 goto err_alloc_all;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006137
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006138 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
Ian Morris63159f22015-03-29 14:00:04 +01006139 if (!dflt)
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006140 goto err_alloc_dflt;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006141
Hong Zhiguoa79ca222013-03-26 01:52:45 +08006142 /* these will be inherited by all namespaces */
6143 dflt->autoconf = ipv6_defaults.autoconf;
6144 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006145
Hannes Frederic Sowa3d1bec92015-03-23 23:36:00 +01006146 dflt->stable_secret.initialized = false;
6147 all->stable_secret.initialized = false;
6148
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006149 net->ipv6.devconf_all = all;
6150 net->ipv6.devconf_dflt = dflt;
6151
6152#ifdef CONFIG_SYSCTL
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006153 err = __addrconf_sysctl_register(net, "all", NULL, all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006154 if (err < 0)
6155 goto err_reg_all;
6156
Eric W. Biedermanf8572d82009-11-05 13:32:03 -08006157 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006158 if (err < 0)
6159 goto err_reg_dflt;
6160#endif
6161 return 0;
6162
6163#ifdef CONFIG_SYSCTL
6164err_reg_dflt:
6165 __addrconf_sysctl_unregister(all);
6166err_reg_all:
6167 kfree(dflt);
6168#endif
6169err_alloc_dflt:
6170 kfree(all);
6171err_alloc_all:
6172 return err;
6173}
6174
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00006175static void __net_exit addrconf_exit_net(struct net *net)
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006176{
6177#ifdef CONFIG_SYSCTL
6178 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6179 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6180#endif
zhuyj73cf0e922014-11-26 10:25:58 +08006181 kfree(net->ipv6.devconf_dflt);
6182 kfree(net->ipv6.devconf_all);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006183}
6184
6185static struct pernet_operations addrconf_ops = {
6186 .init = addrconf_init_net,
6187 .exit = addrconf_exit_net,
6188};
6189
Daniel Borkmann207895fd32015-01-29 12:15:03 +01006190static struct rtnl_af_ops inet6_ops __read_mostly = {
Thomas Grafb382b192010-11-16 04:33:57 +00006191 .family = AF_INET6,
6192 .fill_link_af = inet6_fill_link_af,
6193 .get_link_af_size = inet6_get_link_af_size,
Daniel Borkmann11b1f822015-02-05 14:39:11 +01006194 .validate_link_af = inet6_validate_link_af,
Daniel Borkmannf53adae2013-04-08 04:01:30 +00006195 .set_link_af = inet6_set_link_af,
Thomas Grafb382b192010-11-16 04:33:57 +00006196};
6197
Linus Torvalds1da177e2005-04-16 15:20:36 -07006198/*
6199 * Init / cleanup code
6200 */
6201
6202int __init addrconf_init(void)
6203{
WANG Conga317a2f2014-07-25 15:25:09 -07006204 struct inet6_dev *idev;
stephen hemmingerc2e21292010-03-17 20:31:10 +00006205 int i, err;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006206
Stephen Hemmingere21e8462010-03-20 16:09:01 -07006207 err = ipv6_addr_label_init();
6208 if (err < 0) {
Joe Perchesf3213832012-05-15 14:11:53 +00006209 pr_crit("%s: cannot initialize default policy table: %d\n",
6210 __func__, err);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006211 goto out;
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006212 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006213
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006214 err = register_pernet_subsys(&addrconf_ops);
6215 if (err < 0)
6216 goto out_addrlabel;
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006217
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006218 addrconf_wq = create_workqueue("ipv6_addrconf");
6219 if (!addrconf_wq) {
6220 err = -ENOMEM;
6221 goto out_nowq;
6222 }
6223
Linus Torvalds1da177e2005-04-16 15:20:36 -07006224 /* The addrconf netdev notifier requires that loopback_dev
6225 * has it's ipv6 private information allocated and setup
6226 * before it can bring up and give link-local addresses
6227 * to other devices which are up.
6228 *
6229 * Unfortunately, loopback_dev is not necessarily the first
6230 * entry in the global dev_base list of net devices. In fact,
6231 * it is likely to be the very last entry on that list.
6232 * So this causes the notifier registry below to try and
6233 * give link-local addresses to all devices besides loopback_dev
6234 * first, then loopback_dev, which cases all the non-loopback_dev
6235 * devices to fail to get a link-local address.
6236 *
6237 * So, as a temporary fix, allocate the ipv6 structure for
6238 * loopback_dev first by hand.
6239 * Longer term, all of the dependencies ipv6 has upon the loopback
6240 * device and it being up should be removed.
6241 */
6242 rtnl_lock();
WANG Conga317a2f2014-07-25 15:25:09 -07006243 idev = ipv6_add_dev(init_net.loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006244 rtnl_unlock();
WANG Conga317a2f2014-07-25 15:25:09 -07006245 if (IS_ERR(idev)) {
6246 err = PTR_ERR(idev);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006247 goto errlo;
WANG Conga317a2f2014-07-25 15:25:09 -07006248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006249
stephen hemmingerc2e21292010-03-17 20:31:10 +00006250 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6251 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6252
Linus Torvalds1da177e2005-04-16 15:20:36 -07006253 register_netdevice_notifier(&ipv6_dev_notf);
6254
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006255 addrconf_verify();
Thomas Grafc127ea22007-03-22 11:58:32 -07006256
stephen hemminger3678a9d2013-12-30 10:41:32 -08006257 rtnl_af_register(&inet6_ops);
Thomas Grafb382b192010-11-16 04:33:57 +00006258
Greg Rosec7ac8672011-06-10 01:27:09 +00006259 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6260 NULL);
Thomas Grafc127ea22007-03-22 11:58:32 -07006261 if (err < 0)
6262 goto errout;
6263
6264 /* Only the first call to __rtnl_register can fail */
Greg Rosec7ac8672011-06-10 01:27:09 +00006265 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6266 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6267 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6268 inet6_dump_ifaddr, NULL);
6269 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6270 inet6_dump_ifmcaddr, NULL);
6271 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6272 inet6_dump_ifacaddr, NULL);
Nicolas Dichtel76f8f6c2012-10-25 22:28:51 +00006273 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
Nicolas Dichtel7a674202013-03-05 23:42:06 +00006274 inet6_netconf_dump_devconf, NULL);
Thomas Grafc127ea22007-03-22 11:58:32 -07006275
YOSHIFUJI Hideaki2a8cc6c2007-11-14 15:56:23 +09006276 ipv6_addr_label_rtnl_register();
6277
Linus Torvalds1da177e2005-04-16 15:20:36 -07006278 return 0;
Thomas Grafc127ea22007-03-22 11:58:32 -07006279errout:
Thomas Grafb382b192010-11-16 04:33:57 +00006280 rtnl_af_unregister(&inet6_ops);
Thomas Grafc127ea22007-03-22 11:58:32 -07006281 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006282errlo:
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006283 destroy_workqueue(addrconf_wq);
6284out_nowq:
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006285 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006286out_addrlabel:
6287 ipv6_addr_label_cleanup();
6288out:
Thomas Grafc127ea22007-03-22 11:58:32 -07006289 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006290}
6291
Daniel Lezcano09f77092007-12-13 05:34:58 -08006292void addrconf_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006293{
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006294 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006295 int i;
6296
6297 unregister_netdevice_notifier(&ipv6_dev_notf);
Pavel Emelyanove0da5a42008-01-10 17:42:55 -08006298 unregister_pernet_subsys(&addrconf_ops);
Neil Horman2cc6d2b2010-09-24 09:55:52 +00006299 ipv6_addr_label_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006300
6301 rtnl_lock();
6302
Thomas Grafb382b192010-11-16 04:33:57 +00006303 __rtnl_af_unregister(&inet6_ops);
6304
Daniel Lezcano176c39a2009-03-03 01:06:45 -08006305 /* clean dev list */
6306 for_each_netdev(&init_net, dev) {
6307 if (__in6_dev_get(dev) == NULL)
6308 continue;
6309 addrconf_ifdown(dev, 1);
6310 }
6311 addrconf_ifdown(init_net.loopback_dev, 2);
6312
Linus Torvalds1da177e2005-04-16 15:20:36 -07006313 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006314 * Check hash table.
6315 */
stephen hemminger5c578aed2010-03-17 20:31:11 +00006316 spin_lock_bh(&addrconf_hash_lock);
stephen hemmingerc2e21292010-03-17 20:31:10 +00006317 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6318 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
stephen hemminger5c578aed2010-03-17 20:31:11 +00006319 spin_unlock_bh(&addrconf_hash_lock);
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006320 cancel_delayed_work(&addr_chk_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006321 rtnl_unlock();
Hannes Frederic Sowac15b1cc2014-03-27 18:28:07 +01006322
6323 destroy_workqueue(addrconf_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006324}