blob: c329390342f40112a3d93d0b295e998d30df5aa3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jiri Pirko0c6965d2014-11-05 20:51:51 +01002 * net/sched/act_mirred.c packet mirroring and redirect actions
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Jamal Hadi Salim (2002-4)
10 *
11 * TODO: Add ingress support (and socket redirect support)
12 *
13 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/types.h>
16#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/skbuff.h>
20#include <linux/rtnetlink.h>
21#include <linux/module.h>
22#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/gfp.h>
Daniel Borkmannc4916802016-11-26 01:28:06 +010024#include <linux/if_arp.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070025#include <net/net_namespace.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070026#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/pkt_sched.h>
Paolo Abenie5cf1ba2018-07-30 14:30:45 +020028#include <net/pkt_cls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/tc_act/tc_mirred.h>
30#include <net/tc_act/tc_mirred.h>
31
stephen hemminger3b879562010-07-22 18:45:04 +000032static LIST_HEAD(mirred_list);
Vlad Buslov4e232812018-08-10 20:51:53 +030033static DEFINE_SPINLOCK(mirred_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Shmulik Ladkani53592b32016-10-13 09:06:44 +030035static bool tcf_mirred_is_act_redirect(int action)
36{
37 return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
38}
39
Willem de Bruijn8dc07fd2017-01-07 17:06:37 -050040static bool tcf_mirred_act_wants_ingress(int action)
Shmulik Ladkani53592b32016-10-13 09:06:44 +030041{
42 switch (action) {
43 case TCA_EGRESS_REDIR:
44 case TCA_EGRESS_MIRROR:
Willem de Bruijn8dc07fd2017-01-07 17:06:37 -050045 return false;
Shmulik Ladkani53592b32016-10-13 09:06:44 +030046 case TCA_INGRESS_REDIR:
47 case TCA_INGRESS_MIRROR:
Willem de Bruijn8dc07fd2017-01-07 17:06:37 -050048 return true;
Shmulik Ladkani53592b32016-10-13 09:06:44 +030049 default:
50 BUG();
51 }
52}
53
Paolo Abenie5cf1ba2018-07-30 14:30:45 +020054static bool tcf_mirred_can_reinsert(int action)
55{
56 switch (action) {
57 case TC_ACT_SHOT:
58 case TC_ACT_STOLEN:
59 case TC_ACT_QUEUED:
60 case TC_ACT_TRAP:
61 return true;
62 }
63 return false;
64}
65
Vlad Buslov4e232812018-08-10 20:51:53 +030066static struct net_device *tcf_mirred_dev_dereference(struct tcf_mirred *m)
67{
68 return rcu_dereference_protected(m->tcfm_dev,
69 lockdep_is_held(&m->tcf_lock));
70}
71
Cong Wang9a63b252017-12-05 12:53:07 -080072static void tcf_mirred_release(struct tc_action *a)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
WANG Cong86062032014-02-11 17:07:31 -080074 struct tcf_mirred *m = to_mirred(a);
WANG Congdc327f82016-05-16 15:11:18 -070075 struct net_device *dev;
Eric Dumazet2ee22a92015-07-06 05:18:09 -070076
Vlad Buslov4e232812018-08-10 20:51:53 +030077 spin_lock(&mirred_list_lock);
WANG Conga5b5c952014-02-11 17:07:32 -080078 list_del(&m->tcfm_list);
Vlad Buslov4e232812018-08-10 20:51:53 +030079 spin_unlock(&mirred_list_lock);
80
81 /* last reference to action, no need to lock */
82 dev = rcu_dereference_protected(m->tcfm_dev, 1);
Eric Dumazet2ee22a92015-07-06 05:18:09 -070083 if (dev)
84 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085}
86
Patrick McHardy53b2bf32008-01-23 20:36:30 -080087static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
88 [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
89};
90
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030091static unsigned int mirred_net_id;
WANG Conga85a9702016-07-25 16:09:41 -070092static struct tc_action_ops act_mirred_ops;
WANG Congddf97cc2016-02-22 15:57:53 -080093
Benjamin LaHaisec1b52732013-01-14 05:15:39 +000094static int tcf_mirred_init(struct net *net, struct nlattr *nla,
Vlad Buslov789871b2018-07-05 17:24:25 +030095 struct nlattr *est, struct tc_action **a,
96 int ovr, int bind, bool rtnl_held,
Davide Caratti85d09662019-03-20 14:59:59 +010097 struct tcf_proto *tp,
Vlad Buslov789871b2018-07-05 17:24:25 +030098 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
WANG Congddf97cc2016-02-22 15:57:53 -0800100 struct tc_action_net *tn = net_generic(net, mirred_net_id);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800101 struct nlattr *tb[TCA_MIRRED_MAX + 1];
Davide Carattiff9721d2019-03-20 15:00:04 +0100102 struct tcf_chain *goto_ch = NULL;
Shmulik Ladkani16577922016-10-13 09:06:41 +0300103 bool mac_header_xmit = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct tc_mirred *parm;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700105 struct tcf_mirred *m;
Changli Gaob76965e2009-11-17 04:15:16 -0800106 struct net_device *dev;
WANG Congb2313072016-06-13 13:46:28 -0700107 bool exists = false;
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300108 int ret, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Alexander Aring1d4760c2018-02-15 10:55:00 -0500110 if (!nla) {
111 NL_SET_ERR_MSG_MOD(extack, "Mirred requires attributes to be passed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return -EINVAL;
Alexander Aring1d4760c2018-02-15 10:55:00 -0500113 }
Johannes Berg8cb08172019-04-26 14:07:28 +0200114 ret = nla_parse_nested_deprecated(tb, TCA_MIRRED_MAX, nla,
115 mirred_policy, extack);
Changli Gaob76965e2009-11-17 04:15:16 -0800116 if (ret < 0)
117 return ret;
Alexander Aring1d4760c2018-02-15 10:55:00 -0500118 if (!tb[TCA_MIRRED_PARMS]) {
119 NL_SET_ERR_MSG_MOD(extack, "Missing required mirred parameters");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return -EINVAL;
Alexander Aring1d4760c2018-02-15 10:55:00 -0500121 }
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800122 parm = nla_data(tb[TCA_MIRRED_PARMS]);
Jamal Hadi Salim87dfbdc2016-05-10 16:49:28 -0400123
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300124 err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
125 if (err < 0)
126 return err;
127 exists = err;
Jamal Hadi Salim87dfbdc2016-05-10 16:49:28 -0400128 if (exists && bind)
129 return 0;
130
Changli Gaob76965e2009-11-17 04:15:16 -0800131 switch (parm->eaction) {
132 case TCA_EGRESS_MIRROR:
133 case TCA_EGRESS_REDIR:
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300134 case TCA_INGRESS_REDIR:
135 case TCA_INGRESS_MIRROR:
Changli Gaob76965e2009-11-17 04:15:16 -0800136 break;
137 default:
Jamal Hadi Salim87dfbdc2016-05-10 16:49:28 -0400138 if (exists)
Chris Mi65a206c2017-08-30 02:31:59 -0400139 tcf_idr_release(*a, bind);
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300140 else
141 tcf_idr_cleanup(tn, parm->index);
Alexander Aring1d4760c2018-02-15 10:55:00 -0500142 NL_SET_ERR_MSG_MOD(extack, "Unknown mirred option");
Changli Gaob76965e2009-11-17 04:15:16 -0800143 return -EINVAL;
144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Jamal Hadi Salim87dfbdc2016-05-10 16:49:28 -0400146 if (!exists) {
Vlad Buslov4e232812018-08-10 20:51:53 +0300147 if (!parm->ifindex) {
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300148 tcf_idr_cleanup(tn, parm->index);
Alexander Aring1d4760c2018-02-15 10:55:00 -0500149 NL_SET_ERR_MSG_MOD(extack, "Specified device does not exist");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return -EINVAL;
Alexander Aring1d4760c2018-02-15 10:55:00 -0500151 }
Chris Mi65a206c2017-08-30 02:31:59 -0400152 ret = tcf_idr_create(tn, parm->index, est, a,
153 &act_mirred_ops, bind, true);
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300154 if (ret) {
155 tcf_idr_cleanup(tn, parm->index);
WANG Cong86062032014-02-11 17:07:31 -0800156 return ret;
Vlad Buslov0190c1d2018-07-05 17:24:32 +0300157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 ret = ACT_P_CREATED;
Vlad Buslov4e8ddd72018-07-05 17:24:30 +0300159 } else if (!ovr) {
Chris Mi65a206c2017-08-30 02:31:59 -0400160 tcf_idr_release(*a, bind);
Vlad Buslov4e8ddd72018-07-05 17:24:30 +0300161 return -EEXIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
John Hurley064c5d62019-03-22 12:37:35 +0000163
164 m = to_mirred(*a);
165 if (ret == ACT_P_CREATED)
166 INIT_LIST_HEAD(&m->tcfm_list);
167
Davide Carattiff9721d2019-03-20 15:00:04 +0100168 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
169 if (err < 0)
170 goto release_idr;
171
Vlad Buslov653cd282018-08-14 21:46:16 +0300172 spin_lock_bh(&m->tcf_lock);
Vlad Buslov4e232812018-08-10 20:51:53 +0300173
174 if (parm->ifindex) {
175 dev = dev_get_by_index(net, parm->ifindex);
176 if (!dev) {
Vlad Buslov653cd282018-08-14 21:46:16 +0300177 spin_unlock_bh(&m->tcf_lock);
Davide Carattiff9721d2019-03-20 15:00:04 +0100178 err = -ENODEV;
179 goto put_chain;
Vlad Buslov4e232812018-08-10 20:51:53 +0300180 }
181 mac_header_xmit = dev_is_mac_header_xmit(dev);
182 rcu_swap_protected(m->tcfm_dev, dev,
183 lockdep_is_held(&m->tcf_lock));
184 if (dev)
185 dev_put(dev);
Shmulik Ladkani16577922016-10-13 09:06:41 +0300186 m->tcfm_mac_header_xmit = mac_header_xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
Davide Carattiff9721d2019-03-20 15:00:04 +0100188 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
189 m->tcfm_eaction = parm->eaction;
Vlad Buslov653cd282018-08-14 21:46:16 +0300190 spin_unlock_bh(&m->tcf_lock);
Davide Carattiff9721d2019-03-20 15:00:04 +0100191 if (goto_ch)
192 tcf_chain_put_by_act(goto_ch);
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700193
stephen hemminger3b879562010-07-22 18:45:04 +0000194 if (ret == ACT_P_CREATED) {
Vlad Buslov4e232812018-08-10 20:51:53 +0300195 spin_lock(&mirred_list_lock);
stephen hemminger3b879562010-07-22 18:45:04 +0000196 list_add(&m->tcfm_list, &mirred_list);
Vlad Buslov4e232812018-08-10 20:51:53 +0300197 spin_unlock(&mirred_list_lock);
198
Chris Mi65a206c2017-08-30 02:31:59 -0400199 tcf_idr_insert(tn, *a);
stephen hemminger3b879562010-07-22 18:45:04 +0000200 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return ret;
Davide Carattiff9721d2019-03-20 15:00:04 +0100203put_chain:
204 if (goto_ch)
205 tcf_chain_put_by_act(goto_ch);
206release_idr:
207 tcf_idr_release(*a, bind);
208 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
Jamal Hadi Salim7c5790c2018-08-12 09:35:01 -0400211static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
212 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
WANG Conga85a9702016-07-25 16:09:41 -0700214 struct tcf_mirred *m = to_mirred(a);
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200215 struct sk_buff *skb2 = skb;
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300216 bool m_mac_header_xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 struct net_device *dev;
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300218 int retval, err = 0;
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200219 bool use_reinsert;
220 bool want_ingress;
221 bool is_redirect;
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300222 int m_eaction;
223 int mac_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700225 tcf_lastuse_update(&m->tcf_tm);
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700226 bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);
227
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300228 m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
229 m_eaction = READ_ONCE(m->tcfm_eaction);
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700230 retval = READ_ONCE(m->tcf_action);
Paolo Abeni7fd4b282018-07-30 14:30:43 +0200231 dev = rcu_dereference_bh(m->tcfm_dev);
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700232 if (unlikely(!dev)) {
233 pr_notice_once("tc mirred: target device is gone\n");
stephen hemminger3b879562010-07-22 18:45:04 +0000234 goto out;
235 }
236
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700237 if (unlikely(!(dev->flags & IFF_UP))) {
Joe Perchese87cc472012-05-13 21:56:26 +0000238 net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
239 dev->name);
Changli Gaofeed1f12009-11-17 04:14:00 -0800240 goto out;
241 }
242
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200243 /* we could easily avoid the clone only if called by ingress and clsact;
244 * since we can't easily detect the clsact caller, skip clone only for
245 * ingress - that covers the TC S/W datapath.
246 */
247 is_redirect = tcf_mirred_is_act_redirect(m_eaction);
248 use_reinsert = skb_at_tc_ingress(skb) && is_redirect &&
249 tcf_mirred_can_reinsert(retval);
250 if (!use_reinsert) {
251 skb2 = skb_clone(skb, GFP_ATOMIC);
252 if (!skb2)
253 goto out;
254 }
Changli Gaofeed1f12009-11-17 04:14:00 -0800255
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300256 /* If action's target direction differs than filter's direction,
257 * and devices expect a mac header on xmit, then mac push/pull is
258 * needed.
259 */
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200260 want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
261 if (skb_at_tc_ingress(skb) != want_ingress && m_mac_header_xmit) {
Willem de Bruijna5135bc2017-01-07 17:06:36 -0500262 if (!skb_at_tc_ingress(skb)) {
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300263 /* caught at egress, act ingress: pull mac */
264 mac_len = skb_network_header(skb) - skb_mac_header(skb);
265 skb_pull_rcsum(skb2, mac_len);
266 } else {
267 /* caught at ingress, act egress: push mac */
WANG Cong82a31b92016-06-30 10:15:22 -0700268 skb_push_rcsum(skb2, skb->mac_len);
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300269 }
Changli Gaofeed1f12009-11-17 04:14:00 -0800270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Eric Dumazet8964be42009-11-20 15:35:04 -0800272 skb2->skb_iif = skb->dev->ifindex;
Changli Gao210d6de2010-06-24 16:25:12 +0000273 skb2->dev = dev;
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200274
275 /* mirror is always swallowed */
276 if (is_redirect) {
277 skb2->tc_redirected = 1;
278 skb2->tc_from_ingress = skb2->tc_at_ingress;
Eric Dumazet7236ead2018-11-10 16:22:29 -0800279 if (skb2->tc_from_ingress)
280 skb2->tstamp = 0;
Paolo Abenie5cf1ba2018-07-30 14:30:45 +0200281 /* let's the caller reinsert the packet, if possible */
282 if (use_reinsert) {
283 res->ingress = want_ingress;
284 res->qstats = this_cpu_ptr(m->common.cpu_qstats);
285 return TC_ACT_REINSERT;
286 }
287 }
288
289 if (!want_ingress)
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300290 err = dev_queue_xmit(skb2);
291 else
292 err = netif_receive_skb(skb2);
Changli Gaofeed1f12009-11-17 04:14:00 -0800293
Changli Gaofeed1f12009-11-17 04:14:00 -0800294 if (err) {
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700295out:
296 qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats));
Shmulik Ladkani53592b32016-10-13 09:06:44 +0300297 if (tcf_mirred_is_act_redirect(m_eaction))
Jason Wang16c0b162012-08-15 20:44:27 +0000298 retval = TC_ACT_SHOT;
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700299 }
Changli Gaofeed1f12009-11-17 04:14:00 -0800300
301 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
Jakub Kicinski9798e6f2016-09-21 11:44:05 +0100304static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
Eelco Chaudron28169ab2018-09-21 07:14:02 -0400305 u64 lastuse, bool hw)
Jakub Kicinski9798e6f2016-09-21 11:44:05 +0100306{
Paul Blakey5712bf92016-10-19 17:42:39 +0300307 struct tcf_mirred *m = to_mirred(a);
308 struct tcf_t *tm = &m->tcf_tm;
309
Jakub Kicinski9798e6f2016-09-21 11:44:05 +0100310 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
Eelco Chaudron28169ab2018-09-21 07:14:02 -0400311 if (hw)
312 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
313 bytes, packets);
Roi Dayan3bb23422017-12-26 07:48:51 +0200314 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
Jakub Kicinski9798e6f2016-09-21 11:44:05 +0100315}
316
Jamal Hadi Salim5a7a5552016-09-18 08:45:33 -0400317static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,
318 int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700320 unsigned char *b = skb_tail_pointer(skb);
WANG Conga85a9702016-07-25 16:09:41 -0700321 struct tcf_mirred *m = to_mirred(a);
Eric Dumazet1c40be12010-08-16 20:04:22 +0000322 struct tc_mirred opt = {
323 .index = m->tcf_index,
Vlad Buslov036bb442018-07-05 17:24:24 +0300324 .refcnt = refcount_read(&m->tcf_refcnt) - ref,
325 .bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
Eric Dumazet1c40be12010-08-16 20:04:22 +0000326 };
Vlad Buslov4e232812018-08-10 20:51:53 +0300327 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 struct tcf_t t;
329
Vlad Buslov653cd282018-08-14 21:46:16 +0300330 spin_lock_bh(&m->tcf_lock);
Vlad Buslov4e232812018-08-10 20:51:53 +0300331 opt.action = m->tcf_action;
332 opt.eaction = m->tcfm_eaction;
333 dev = tcf_mirred_dev_dereference(m);
334 if (dev)
335 opt.ifindex = dev->ifindex;
336
David S. Miller1b34ec42012-03-29 05:11:39 -0400337 if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
338 goto nla_put_failure;
Jamal Hadi Salim48d8ee12016-06-06 06:32:55 -0400339
340 tcf_tm_dump(&t, &m->tcf_tm);
Nicolas Dichtel9854518e2016-04-26 10:06:18 +0200341 if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD))
David S. Miller1b34ec42012-03-29 05:11:39 -0400342 goto nla_put_failure;
Vlad Buslov653cd282018-08-14 21:46:16 +0300343 spin_unlock_bh(&m->tcf_lock);
Vlad Buslov4e232812018-08-10 20:51:53 +0300344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return skb->len;
346
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800347nla_put_failure:
Vlad Buslov653cd282018-08-14 21:46:16 +0300348 spin_unlock_bh(&m->tcf_lock);
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700349 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return -1;
351}
352
WANG Congddf97cc2016-02-22 15:57:53 -0800353static int tcf_mirred_walker(struct net *net, struct sk_buff *skb,
354 struct netlink_callback *cb, int type,
Alexander Aring41780102018-02-15 10:54:58 -0500355 const struct tc_action_ops *ops,
356 struct netlink_ext_ack *extack)
WANG Congddf97cc2016-02-22 15:57:53 -0800357{
358 struct tc_action_net *tn = net_generic(net, mirred_net_id);
359
Alexander Aringb3620142018-02-15 10:54:59 -0500360 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
WANG Congddf97cc2016-02-22 15:57:53 -0800361}
362
Cong Wangf061b482018-08-29 10:15:35 -0700363static int tcf_mirred_search(struct net *net, struct tc_action **a, u32 index)
WANG Congddf97cc2016-02-22 15:57:53 -0800364{
365 struct tc_action_net *tn = net_generic(net, mirred_net_id);
366
Chris Mi65a206c2017-08-30 02:31:59 -0400367 return tcf_idr_search(tn, a, index);
WANG Congddf97cc2016-02-22 15:57:53 -0800368}
369
stephen hemminger3b879562010-07-22 18:45:04 +0000370static int mirred_device_event(struct notifier_block *unused,
371 unsigned long event, void *ptr)
372{
Jiri Pirko351638e2013-05-28 01:30:21 +0000373 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
stephen hemminger3b879562010-07-22 18:45:04 +0000374 struct tcf_mirred *m;
375
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700376 ASSERT_RTNL();
WANG Cong6bd00b82015-10-01 11:37:42 -0700377 if (event == NETDEV_UNREGISTER) {
Vlad Buslov4e232812018-08-10 20:51:53 +0300378 spin_lock(&mirred_list_lock);
stephen hemminger3b879562010-07-22 18:45:04 +0000379 list_for_each_entry(m, &mirred_list, tcfm_list) {
Vlad Buslov653cd282018-08-14 21:46:16 +0300380 spin_lock_bh(&m->tcf_lock);
Vlad Buslov4e232812018-08-10 20:51:53 +0300381 if (tcf_mirred_dev_dereference(m) == dev) {
stephen hemminger3b879562010-07-22 18:45:04 +0000382 dev_put(dev);
Eric Dumazet2ee22a92015-07-06 05:18:09 -0700383 /* Note : no rcu grace period necessary, as
384 * net_device are already rcu protected.
385 */
386 RCU_INIT_POINTER(m->tcfm_dev, NULL);
stephen hemminger3b879562010-07-22 18:45:04 +0000387 }
Vlad Buslov653cd282018-08-14 21:46:16 +0300388 spin_unlock_bh(&m->tcf_lock);
stephen hemminger3b879562010-07-22 18:45:04 +0000389 }
Vlad Buslov4e232812018-08-10 20:51:53 +0300390 spin_unlock(&mirred_list_lock);
WANG Cong6bd00b82015-10-01 11:37:42 -0700391 }
stephen hemminger3b879562010-07-22 18:45:04 +0000392
393 return NOTIFY_DONE;
394}
395
396static struct notifier_block mirred_device_notifier = {
397 .notifier_call = mirred_device_event,
398};
399
Jiri Pirko843e79d2017-10-11 09:41:07 +0200400static struct net_device *tcf_mirred_get_dev(const struct tc_action *a)
Hadar Hen Zion255cb302016-12-01 14:06:36 +0200401{
Jiri Pirko843e79d2017-10-11 09:41:07 +0200402 struct tcf_mirred *m = to_mirred(a);
Vlad Buslov4e232812018-08-10 20:51:53 +0300403 struct net_device *dev;
Hadar Hen Zion255cb302016-12-01 14:06:36 +0200404
Vlad Buslov4e232812018-08-10 20:51:53 +0300405 rcu_read_lock();
406 dev = rcu_dereference(m->tcfm_dev);
Vlad Buslov84a75b32018-08-10 20:51:52 +0300407 if (dev)
408 dev_hold(dev);
Vlad Buslov4e232812018-08-10 20:51:53 +0300409 rcu_read_unlock();
Vlad Buslov84a75b32018-08-10 20:51:52 +0300410
411 return dev;
412}
413
414static void tcf_mirred_put_dev(struct net_device *dev)
415{
416 dev_put(dev);
Hadar Hen Zion255cb302016-12-01 14:06:36 +0200417}
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419static struct tc_action_ops act_mirred_ops = {
420 .kind = "mirred",
Eli Coheneddd2cf2019-02-10 14:25:00 +0200421 .id = TCA_ID_MIRRED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 .owner = THIS_MODULE,
Jamal Hadi Salim7c5790c2018-08-12 09:35:01 -0400423 .act = tcf_mirred_act,
Jakub Kicinski9798e6f2016-09-21 11:44:05 +0100424 .stats_update = tcf_stats_update,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 .dump = tcf_mirred_dump,
WANG Cong86062032014-02-11 17:07:31 -0800426 .cleanup = tcf_mirred_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 .init = tcf_mirred_init,
WANG Congddf97cc2016-02-22 15:57:53 -0800428 .walk = tcf_mirred_walker,
429 .lookup = tcf_mirred_search,
WANG Conga85a9702016-07-25 16:09:41 -0700430 .size = sizeof(struct tcf_mirred),
Jiri Pirko843e79d2017-10-11 09:41:07 +0200431 .get_dev = tcf_mirred_get_dev,
Vlad Buslov84a75b32018-08-10 20:51:52 +0300432 .put_dev = tcf_mirred_put_dev,
WANG Congddf97cc2016-02-22 15:57:53 -0800433};
434
435static __net_init int mirred_init_net(struct net *net)
436{
437 struct tc_action_net *tn = net_generic(net, mirred_net_id);
438
Cong Wangc7e460c2017-11-06 13:47:18 -0800439 return tc_action_net_init(tn, &act_mirred_ops);
WANG Congddf97cc2016-02-22 15:57:53 -0800440}
441
Cong Wang039af9c2017-12-11 15:35:03 -0800442static void __net_exit mirred_exit_net(struct list_head *net_list)
WANG Congddf97cc2016-02-22 15:57:53 -0800443{
Cong Wang039af9c2017-12-11 15:35:03 -0800444 tc_action_net_exit(net_list, mirred_net_id);
WANG Congddf97cc2016-02-22 15:57:53 -0800445}
446
447static struct pernet_operations mirred_net_ops = {
448 .init = mirred_init_net,
Cong Wang039af9c2017-12-11 15:35:03 -0800449 .exit_batch = mirred_exit_net,
WANG Congddf97cc2016-02-22 15:57:53 -0800450 .id = &mirred_net_id,
451 .size = sizeof(struct tc_action_net),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452};
453
454MODULE_AUTHOR("Jamal Hadi Salim(2002)");
455MODULE_DESCRIPTION("Device Mirror/redirect actions");
456MODULE_LICENSE("GPL");
457
David S. Millere9ce1cd2006-08-21 23:54:55 -0700458static int __init mirred_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
stephen hemminger3b879562010-07-22 18:45:04 +0000460 int err = register_netdevice_notifier(&mirred_device_notifier);
461 if (err)
462 return err;
463
stephen hemminger6ff9c362010-05-12 06:37:05 +0000464 pr_info("Mirror/redirect action on\n");
WANG Congddf97cc2016-02-22 15:57:53 -0800465 return tcf_register_action(&act_mirred_ops, &mirred_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
David S. Millere9ce1cd2006-08-21 23:54:55 -0700468static void __exit mirred_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
WANG Congddf97cc2016-02-22 15:57:53 -0800470 tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
WANG Cong568a1532013-12-20 00:08:51 -0800471 unregister_netdevice_notifier(&mirred_device_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472}
473
474module_init(mirred_init_module);
475module_exit(mirred_cleanup_module);