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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * net/dst.h Protocol independent destination cache definitions.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 */
8
9#ifndef _NET_DST_H
10#define _NET_DST_H
11
Alexey Dobriyan86393e52009-08-29 01:34:49 +000012#include <net/dst_ops.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020013#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/rtnetlink.h>
15#include <linux/rcupdate.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050016#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/jiffies.h>
Eric Dumazet9620fef2017-08-18 12:08:07 -070018#include <linux/refcount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/neighbour.h>
20#include <asm/processor.h>
Brian Vazqueze43b2192021-02-01 17:41:29 +000021#include <linux/indirect_call_wrapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Linus Torvalds1da177e2005-04-16 15:20:36 -070023struct sk_buff;
24
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000025struct dst_entry {
Alexey Dobriyan66727142017-05-17 19:31:39 +030026 struct net_device *dev;
David S. Miller62fa8a82011-01-26 20:51:05 -080027 struct dst_ops *ops;
28 unsigned long _metrics;
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +000029 unsigned long expires;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070030#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 struct xfrm_state *xfrm;
Eric Dumazet5635c102008-11-16 19:46:36 -080032#else
33 void *__pad1;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070034#endif
Eldad Zack7f95e182012-06-16 15:14:49 +020035 int (*input)(struct sk_buff *);
Eric W. Biedermanede20592015-10-07 16:48:47 -050036 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
David S. Miller5110effe2012-07-02 02:21:03 -070038 unsigned short flags;
David S. Millerf6b72b622011-07-14 07:53:20 -070039#define DST_NOXFRM 0x0002
40#define DST_NOPOLICY 0x0004
Wei Wang1eb04e72017-06-17 10:42:43 -070041#define DST_NOCOUNT 0x0008
42#define DST_FAKE_RTABLE 0x0010
43#define DST_XFRM_TUNNEL 0x0020
44#define DST_XFRM_QUEUE 0x0040
45#define DST_METADATA 0x0080
David S. Millerf6b72b622011-07-14 07:53:20 -070046
David S. Millerf5b0a872012-07-19 12:31:33 -070047 /* A non-zero value of dst->obsolete forces by-hand validation
48 * of the route entry. Positive values are set by the generic
49 * dst layer to indicate that the entry has been forcefully
50 * destroyed.
51 *
52 * Negative values are used by the implementation layer code to
53 * force invocation of the dst_ops->check() method.
54 */
David S. Miller62fa8a82011-01-26 20:51:05 -080055 short obsolete;
David S. Millerf5b0a872012-07-19 12:31:33 -070056#define DST_OBSOLETE_NONE 0
57#define DST_OBSOLETE_DEAD 2
58#define DST_OBSOLETE_FORCE_CHK -1
David S. Millerceb33202012-07-17 11:31:28 -070059#define DST_OBSOLETE_KILL -2
David S. Miller62fa8a82011-01-26 20:51:05 -080060 unsigned short header_len; /* more space at head required */
61 unsigned short trailer_len; /* space to reserve at tail */
Julian Anastasov51ce8bd2017-02-06 23:14:17 +020062
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070063 /*
64 * __refcnt wants to be on a different cache line from
65 * input/output/ops or performance tanks badly
66 */
David Miller8b207e72017-11-28 15:40:53 -050067#ifdef CONFIG_64BIT
68 atomic_t __refcnt; /* 64-bit offset 64 */
69#endif
Eric Dumazet1e19e022007-02-09 16:26:55 -080070 int __use;
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070071 unsigned long lastuse;
Jiri Benc751a5872015-08-21 12:41:14 +020072 struct lwtunnel_state *lwtstate;
David Miller8b207e72017-11-28 15:40:53 -050073 struct rcu_head rcu_head;
74 short error;
75 short __pad;
76 __u32 tclassid;
77#ifndef CONFIG_64BIT
78 atomic_t __refcnt; /* 32-bit offset 64 */
79#endif
Eric Dumazet9038c322021-12-04 20:22:03 -080080 netdevice_tracker dev_tracker;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
82
Eric Dumazet3fb07da2017-05-25 14:27:35 -070083struct dst_metrics {
84 u32 metrics[RTAX_MAX];
Eric Dumazet9620fef2017-08-18 12:08:07 -070085 refcount_t refcnt;
Geert Uytterhoeven258a9802019-12-20 14:31:40 +010086} __aligned(4); /* Low pointer bits contain DST_METRICS_FLAGS */
Eric Dumazet3fb07da2017-05-25 14:27:35 -070087extern const struct dst_metrics dst_default_metrics;
88
Joe Perchesa4023dd2013-09-20 11:23:21 -070089u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -080090
Michal Kubečeke5fd3872014-03-27 13:04:08 +010091#define DST_METRICS_READ_ONLY 0x1UL
Eric Dumazet3fb07da2017-05-25 14:27:35 -070092#define DST_METRICS_REFCOUNTED 0x2UL
Michal Kubečeke5fd3872014-03-27 13:04:08 +010093#define DST_METRICS_FLAGS 0x3UL
David S. Miller62fa8a82011-01-26 20:51:05 -080094#define __DST_METRICS_PTR(Y) \
Michal Kubečeke5fd3872014-03-27 13:04:08 +010095 ((u32 *)((Y) & ~DST_METRICS_FLAGS))
David S. Miller62fa8a82011-01-26 20:51:05 -080096#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
97
98static inline bool dst_metrics_read_only(const struct dst_entry *dst)
99{
100 return dst->_metrics & DST_METRICS_READ_ONLY;
101}
102
Joe Perchesa4023dd2013-09-20 11:23:21 -0700103void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -0800104
105static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
106{
107 unsigned long val = dst->_metrics;
108 if (!(val & DST_METRICS_READ_ONLY))
109 __dst_destroy_metrics_generic(dst, val);
110}
111
112static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
113{
114 unsigned long p = dst->_metrics;
115
Stephen Hemminger1f370702011-05-24 13:50:52 -0400116 BUG_ON(!p);
117
David S. Miller62fa8a82011-01-26 20:51:05 -0800118 if (p & DST_METRICS_READ_ONLY)
119 return dst->ops->cow_metrics(dst, p);
120 return __DST_METRICS_PTR(p);
121}
122
123/* This may only be invoked before the entry has reached global
124 * visibility.
125 */
126static inline void dst_init_metrics(struct dst_entry *dst,
127 const u32 *src_metrics,
128 bool read_only)
129{
130 dst->_metrics = ((unsigned long) src_metrics) |
131 (read_only ? DST_METRICS_READ_ONLY : 0);
132}
133
134static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
135{
136 u32 *dst_metrics = dst_metrics_write_ptr(dest);
137
138 if (dst_metrics) {
139 u32 *src_metrics = DST_METRICS_PTR(src);
140
141 memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
142 }
143}
144
145static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
146{
147 return DST_METRICS_PTR(dst);
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static inline u32
David S. Miller5170ae82010-12-12 21:35:57 -0800151dst_metric_raw(const struct dst_entry *dst, const int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
David S. Miller62fa8a82011-01-26 20:51:05 -0800153 u32 *p = DST_METRICS_PTR(dst);
154
155 return p[metric-1];
David S. Millerdefb3512010-12-08 21:16:57 -0800156}
157
David S. Miller5170ae82010-12-12 21:35:57 -0800158static inline u32
159dst_metric(const struct dst_entry *dst, const int metric)
160{
David S. Miller0dbaee32010-12-13 12:52:14 -0800161 WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
David S. Millerd33e4552010-12-14 13:01:14 -0800162 metric == RTAX_ADVMSS ||
163 metric == RTAX_MTU);
David S. Miller5170ae82010-12-12 21:35:57 -0800164 return dst_metric_raw(dst, metric);
165}
166
David S. Miller0dbaee32010-12-13 12:52:14 -0800167static inline u32
168dst_metric_advmss(const struct dst_entry *dst)
169{
170 u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
171
172 if (!advmss)
173 advmss = dst->ops->default_advmss(dst);
174
175 return advmss;
176}
177
David S. Millerdefb3512010-12-08 21:16:57 -0800178static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
179{
David S. Miller62fa8a82011-01-26 20:51:05 -0800180 u32 *p = dst_metrics_write_ptr(dst);
David S. Millerdefb3512010-12-08 21:16:57 -0800181
David S. Miller62fa8a82011-01-26 20:51:05 -0800182 if (p)
183 p[metric-1] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Daniel Borkmannc3a8d942015-08-31 15:58:47 +0200186/* Kernel-internal feature bits that are unallocated in user space. */
Vandana BN40f6a2cb2019-07-01 17:25:39 +0530187#define DST_FEATURE_ECN_CA (1U << 31)
Daniel Borkmannc3a8d942015-08-31 15:58:47 +0200188
189#define DST_FEATURE_MASK (DST_FEATURE_ECN_CA)
190#define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN)
191
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000192static inline u32
193dst_feature(const struct dst_entry *dst, u32 feature)
194{
David S. Millerbb5b7c12009-12-15 20:56:42 -0800195 return dst_metric(dst, RTAX_FEATURES) & feature;
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000196}
197
Brian Vazquezf67fbea2021-02-01 17:41:31 +0000198INDIRECT_CALLABLE_DECLARE(unsigned int ip6_mtu(const struct dst_entry *));
199INDIRECT_CALLABLE_DECLARE(unsigned int ipv4_mtu(const struct dst_entry *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200static inline u32 dst_mtu(const struct dst_entry *dst)
201{
Brian Vazquezf67fbea2021-02-01 17:41:31 +0000202 return INDIRECT_CALL_INET(dst->ops->mtu, ip6_mtu, ipv4_mtu, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
204
Stephen Hemmingerc1e20f72008-07-18 23:02:15 -0700205/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
206static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
207{
208 return msecs_to_jiffies(dst_metric(dst, metric));
209}
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211static inline u32
212dst_allfrag(const struct dst_entry *dst)
213{
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000214 int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return ret;
216}
217
218static inline int
David S. Millerd33e4552010-12-14 13:01:14 -0800219dst_metric_locked(const struct dst_entry *dst, int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Miaohe Lin5af68892020-08-29 05:21:30 -0400221 return dst_metric(dst, RTAX_LOCK) & (1 << metric);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
Eldad Zack7f95e182012-06-16 15:14:49 +0200224static inline void dst_hold(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Eric Dumazet5635c102008-11-16 19:46:36 -0800226 /*
227 * If your kernel compilation stops here, please check
David Miller8b207e72017-11-28 15:40:53 -0500228 * the placement of __refcnt in struct dst_entry
Eric Dumazet5635c102008-11-16 19:46:36 -0800229 */
230 BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
Wei Wang44ebe792017-06-17 10:42:44 -0700231 WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
Eric Dumazet7fee2262010-05-11 23:19:48 +0000234static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
235{
Paolo Abeni32d18ab2017-10-24 12:41:01 +0200236 if (unlikely(time != dst->lastuse)) {
Wei Wang0da4af02017-10-13 15:08:07 -0700237 dst->__use++;
238 dst->lastuse = time;
239 }
240}
241
242static inline void dst_hold_and_use(struct dst_entry *dst, unsigned long time)
243{
244 dst_hold(dst);
245 dst_use_noref(dst, time);
Eric Dumazet7fee2262010-05-11 23:19:48 +0000246}
247
Eldad Zack7f95e182012-06-16 15:14:49 +0200248static inline struct dst_entry *dst_clone(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 if (dst)
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700251 dst_hold(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 return dst;
253}
254
Joe Perchesa4023dd2013-09-20 11:23:21 -0700255void dst_release(struct dst_entry *dst);
Eric Dumazet7fee2262010-05-11 23:19:48 +0000256
Wei Wang5f56f402017-06-17 10:42:27 -0700257void dst_release_immediate(struct dst_entry *dst);
258
Eric Dumazet7fee2262010-05-11 23:19:48 +0000259static inline void refdst_drop(unsigned long refdst)
260{
261 if (!(refdst & SKB_DST_NOREF))
262 dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
263}
264
265/**
266 * skb_dst_drop - drops skb dst
267 * @skb: buffer
268 *
269 * Drops dst reference count if a reference was taken.
270 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000271static inline void skb_dst_drop(struct sk_buff *skb)
272{
Eric Dumazet7fee2262010-05-11 23:19:48 +0000273 if (skb->_skb_refdst) {
274 refdst_drop(skb->_skb_refdst);
275 skb->_skb_refdst = 0UL;
276 }
277}
278
Joe Stringere79e2592015-08-26 11:31:47 -0700279static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst)
Eric Dumazet7fee2262010-05-11 23:19:48 +0000280{
Paolo Abeni8a886b12021-07-28 18:24:00 +0200281 nskb->slow_gro |= !!refdst;
Joe Stringere79e2592015-08-26 11:31:47 -0700282 nskb->_skb_refdst = refdst;
Eric Dumazet7fee2262010-05-11 23:19:48 +0000283 if (!(nskb->_skb_refdst & SKB_DST_NOREF))
284 dst_clone(skb_dst(nskb));
285}
286
Joe Stringere79e2592015-08-26 11:31:47 -0700287static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
288{
289 __skb_dst_copy(nskb, oskb->_skb_refdst);
290}
291
Eric Dumazet7fee2262010-05-11 23:19:48 +0000292/**
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800293 * dst_hold_safe - Take a reference on a dst if possible
294 * @dst: pointer to dst entry
295 *
296 * This helper returns false if it could not safely
297 * take a reference on a dst.
298 */
299static inline bool dst_hold_safe(struct dst_entry *dst)
300{
Wei Wangb2a9c0e2017-06-17 10:42:41 -0700301 return atomic_inc_not_zero(&dst->__refcnt);
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800302}
303
304/**
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700305 * skb_dst_force - makes sure skb dst is refcounted
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800306 * @skb: buffer
307 *
308 * If dst is not yet refcounted and not destroyed, grab a ref on it.
Florian Westphalb60a7732019-06-26 20:40:45 +0200309 * Returns true if dst is refcounted.
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800310 */
Florian Westphalb60a7732019-06-26 20:40:45 +0200311static inline bool skb_dst_force(struct sk_buff *skb)
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800312{
313 if (skb_dst_is_noref(skb)) {
314 struct dst_entry *dst = skb_dst(skb);
315
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700316 WARN_ON(!rcu_read_lock_held());
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800317 if (!dst_hold_safe(dst))
318 dst = NULL;
319
320 skb->_skb_refdst = (unsigned long)dst;
Paolo Abeni8a886b12021-07-28 18:24:00 +0200321 skb->slow_gro |= !!dst;
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800322 }
Florian Westphalb60a7732019-06-26 20:40:45 +0200323
324 return skb->_skb_refdst != 0UL;
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800325}
326
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700327
328/**
Eric Dumazet290b8952010-09-27 00:33:35 +0000329 * __skb_tunnel_rx - prepare skb for rx reinsert
330 * @skb: buffer
331 * @dev: tunnel device
Nicolas Dichtelea231922013-09-02 15:34:58 +0200332 * @net: netns for packet i/o
Eric Dumazet290b8952010-09-27 00:33:35 +0000333 *
334 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
335 * so make some cleanups. (no accounting done)
336 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200337static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
338 struct net *net)
Eric Dumazet290b8952010-09-27 00:33:35 +0000339{
340 skb->dev = dev;
Tom Herbertbdeab992011-08-14 19:45:55 +0000341
342 /*
Tom Herbert7539fad2013-12-15 22:12:18 -0800343 * Clear hash so that we can recalulate the hash for the
Tom Herbertbdeab992011-08-14 19:45:55 +0000344 * encapsulated packet, unless we have already determine the hash
345 * over the L4 4-tuple.
346 */
Tom Herbert7539fad2013-12-15 22:12:18 -0800347 skb_clear_hash_if_not_l4(skb);
Eric Dumazet290b8952010-09-27 00:33:35 +0000348 skb_set_queue_mapping(skb, 0);
Nicolas Dichtelea231922013-09-02 15:34:58 +0200349 skb_scrub_packet(skb, !net_eq(net, dev_net(dev)));
Eric Dumazet290b8952010-09-27 00:33:35 +0000350}
351
352/**
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700353 * skb_tunnel_rx - prepare skb for rx reinsert
354 * @skb: buffer
355 * @dev: tunnel device
Jonathan Neuschäfer8eb1a852018-03-04 03:29:53 +0100356 * @net: netns for packet i/o
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700357 *
358 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
359 * so make some cleanups, and perform accounting.
Eric Dumazet290b8952010-09-27 00:33:35 +0000360 * Note: this accounting is not SMP safe.
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700361 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200362static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
363 struct net *net)
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700364{
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700365 /* TODO : stats should be SMP safe */
366 dev->stats.rx_packets++;
367 dev->stats.rx_bytes += skb->len;
Nicolas Dichtelea231922013-09-02 15:34:58 +0200368 __skb_tunnel_rx(skb, dev, net);
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700369}
370
Daniel Borkmann808c1b62016-03-16 01:42:50 +0100371static inline u32 dst_tclassid(const struct sk_buff *skb)
372{
373#ifdef CONFIG_IP_ROUTE_CLASSID
374 const struct dst_entry *dst;
375
376 dst = skb_dst(skb);
377 if (dst)
378 return dst->tclassid;
379#endif
380 return 0;
381}
382
Eric W. Biedermanede20592015-10-07 16:48:47 -0500383int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400384static inline int dst_discard(struct sk_buff *skb)
385{
Eric W. Biedermanede20592015-10-07 16:48:47 -0500386 return dst_discard_out(&init_net, skb->sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400387}
Joe Perchesa4023dd2013-09-20 11:23:21 -0700388void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
389 int initial_obsolete, unsigned short flags);
Thomas Graff38a9eb2015-07-21 10:43:56 +0200390void dst_init(struct dst_entry *dst, struct dst_ops *ops,
391 struct net_device *dev, int initial_ref, int initial_obsolete,
392 unsigned short flags);
Joe Perchesa4023dd2013-09-20 11:23:21 -0700393struct dst_entry *dst_destroy(struct dst_entry *dst);
Wei Wang4a6ce2b2017-06-17 10:42:28 -0700394void dst_dev_put(struct dst_entry *dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396static inline void dst_confirm(struct dst_entry *dst)
397{
David S. Miller5110effe2012-07-02 02:21:03 -0700398}
Eric Dumazetf2c31e32011-07-29 19:00:53 +0000399
David S. Millerd3aaeb32011-07-18 00:40:17 -0700400static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
401{
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000402 struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr);
403 return IS_ERR(n) ? NULL : n;
David S. Millerf894cbf2012-07-02 21:52:24 -0700404}
405
406static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
407 struct sk_buff *skb)
408{
Guillaume Nault0992d672020-10-31 01:07:25 +0100409 struct neighbour *n;
Martin Varghese394de112020-07-05 14:23:49 +0530410
Guillaume Nault0992d672020-10-31 01:07:25 +0100411 if (WARN_ON_ONCE(!dst->ops->neigh_lookup))
412 return NULL;
413
414 n = dst->ops->neigh_lookup(dst, skb, NULL);
Martin Varghese394de112020-07-05 14:23:49 +0530415
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000416 return IS_ERR(n) ? NULL : n;
David S. Millerd3aaeb32011-07-18 00:40:17 -0700417}
418
Julian Anastasov63fca652017-02-06 23:14:15 +0200419static inline void dst_confirm_neigh(const struct dst_entry *dst,
420 const void *daddr)
421{
422 if (dst->ops->confirm_neigh)
423 dst->ops->confirm_neigh(dst, daddr);
424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426static inline void dst_link_failure(struct sk_buff *skb)
427{
Eric Dumazetadf30902009-06-02 05:19:30 +0000428 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 if (dst && dst->ops && dst->ops->link_failure)
430 dst->ops->link_failure(skb);
431}
432
433static inline void dst_set_expires(struct dst_entry *dst, int timeout)
434{
435 unsigned long expires = jiffies + timeout;
436
437 if (expires == 0)
438 expires = 1;
439
440 if (dst->expires == 0 || time_before(expires, dst->expires))
441 dst->expires = expires;
442}
443
Brian Vazquez6585d7dc2021-02-01 17:41:30 +0000444INDIRECT_CALLABLE_DECLARE(int ip6_output(struct net *, struct sock *,
445 struct sk_buff *));
446INDIRECT_CALLABLE_DECLARE(int ip_output(struct net *, struct sock *,
447 struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448/* Output packet to network from transport. */
Eric W. Biederman13206b62015-10-07 16:48:35 -0500449static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
Eric Dumazetaad88722014-04-15 13:47:15 -0400450{
Brian Vazquez6585d7dc2021-02-01 17:41:30 +0000451 return INDIRECT_CALL_INET(skb_dst(skb)->output,
452 ip6_output, ip_output,
453 net, sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400454}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Brian Vazqueze43b2192021-02-01 17:41:29 +0000456INDIRECT_CALLABLE_DECLARE(int ip6_input(struct sk_buff *));
457INDIRECT_CALLABLE_DECLARE(int ip_local_deliver(struct sk_buff *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458/* Input packet from network to transport. */
459static inline int dst_input(struct sk_buff *skb)
460{
Brian Vazqueze43b2192021-02-01 17:41:29 +0000461 return INDIRECT_CALL_INET(skb_dst(skb)->input,
462 ip6_input, ip_local_deliver, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
Brian Vazquezbbd807d2021-02-01 17:41:32 +0000465INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
466 u32));
467INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
468 u32));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
470{
471 if (dst->obsolete)
Brian Vazquezbbd807d2021-02-01 17:41:32 +0000472 dst = INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check,
473 ipv4_dst_check, dst, cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 return dst;
475}
476
Herbert Xu815f4e52007-12-12 10:36:59 -0800477/* Flags for xfrm_lookup flags argument. */
478enum {
David S. Miller80c0bc92011-03-01 14:36:37 -0800479 XFRM_LOOKUP_ICMP = 1 << 0,
Steffen Klassertb8c203b2014-09-16 10:08:49 +0200480 XFRM_LOOKUP_QUEUE = 1 << 1,
huaibin Wangac37e252015-02-11 18:10:36 +0100481 XFRM_LOOKUP_KEEP_DST_REF = 1 << 2,
Herbert Xu815f4e52007-12-12 10:36:59 -0800482};
483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484struct flowi;
485#ifndef CONFIG_XFRM
David S. Miller452edd52011-03-02 13:27:41 -0800486static inline struct dst_entry *xfrm_lookup(struct net *net,
487 struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700488 const struct flowi *fl,
489 const struct sock *sk,
David S. Miller452edd52011-03-02 13:27:41 -0800490 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
David S. Miller452edd52011-03-02 13:27:41 -0800492 return dst_orig;
Steffen Klassertf92ee612014-09-16 10:08:40 +0200493}
494
Benedict Wongbc56b332018-07-19 10:50:44 -0700495static inline struct dst_entry *
496xfrm_lookup_with_ifid(struct net *net, struct dst_entry *dst_orig,
497 const struct flowi *fl, const struct sock *sk,
498 int flags, u32 if_id)
499{
500 return dst_orig;
501}
502
Steffen Klassertf92ee612014-09-16 10:08:40 +0200503static inline struct dst_entry *xfrm_lookup_route(struct net *net,
504 struct dst_entry *dst_orig,
505 const struct flowi *fl,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700506 const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200507 int flags)
508{
509 return dst_orig;
510}
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400511
512static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
513{
514 return NULL;
515}
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517#else
Joe Perchesa4023dd2013-09-20 11:23:21 -0700518struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700519 const struct flowi *fl, const struct sock *sk,
Joe Perchesa4023dd2013-09-20 11:23:21 -0700520 int flags);
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400521
Benedict Wongbc56b332018-07-19 10:50:44 -0700522struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
523 struct dst_entry *dst_orig,
524 const struct flowi *fl,
525 const struct sock *sk, int flags,
526 u32 if_id);
527
Steffen Klassertf92ee612014-09-16 10:08:40 +0200528struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700529 const struct flowi *fl, const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200530 int flags);
531
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400532/* skb attached with this dst needs transformation if dst->xfrm is valid */
533static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
534{
535 return dst->xfrm;
536}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Nicolas Dichtelf15ca722018-01-25 19:03:03 +0100539static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
540{
541 struct dst_entry *dst = skb_dst(skb);
542
543 if (dst && dst->ops->update_pmtu)
Hangbin Liubd085ef2019-12-22 10:51:09 +0800544 dst->ops->update_pmtu(dst, NULL, skb, mtu, true);
Nicolas Dichtelf15ca722018-01-25 19:03:03 +0100545}
546
Hangbin Liu07dc35c2019-12-22 10:51:12 +0800547/* update dst pmtu but not do neighbor confirm */
548static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu)
549{
550 struct dst_entry *dst = skb_dst(skb);
551
552 if (dst && dst->ops->update_pmtu)
553 dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
554}
555
Daniel Borkmannc4c877b2021-03-10 01:38:09 +0100556struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie);
557void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
558 struct sk_buff *skb, u32 mtu, bool confirm_neigh);
559void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
560 struct sk_buff *skb);
561u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old);
562struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst,
563 struct sk_buff *skb,
564 const void *daddr);
565unsigned int dst_blackhole_mtu(const struct dst_entry *dst);
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567#endif /* _NET_DST_H */