blob: 12b31c602cb0dd648cca27ebd4eed4fa6b07e81e [file] [log] [blame]
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>
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022struct sk_buff;
23
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000024struct dst_entry {
Alexey Dobriyan66727142017-05-17 19:31:39 +030025 struct net_device *dev;
David S. Miller62fa8a82011-01-26 20:51:05 -080026 struct dst_ops *ops;
27 unsigned long _metrics;
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +000028 unsigned long expires;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070029#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 struct xfrm_state *xfrm;
Eric Dumazet5635c102008-11-16 19:46:36 -080031#else
32 void *__pad1;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070033#endif
Eldad Zack7f95e182012-06-16 15:14:49 +020034 int (*input)(struct sk_buff *);
Eric W. Biedermanede20592015-10-07 16:48:47 -050035 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
David S. Miller5110effe2012-07-02 02:21:03 -070037 unsigned short flags;
David S. Millerf6b72b622011-07-14 07:53:20 -070038#define DST_HOST 0x0001
39#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
Eric Dumazet3fb07da2017-05-25 14:27:35 -070082struct dst_metrics {
83 u32 metrics[RTAX_MAX];
Eric Dumazet9620fef2017-08-18 12:08:07 -070084 refcount_t refcnt;
Eric Dumazet3fb07da2017-05-25 14:27:35 -070085};
86extern const struct dst_metrics dst_default_metrics;
87
Joe Perchesa4023dd2013-09-20 11:23:21 -070088u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -080089
Michal Kubečeke5fd3872014-03-27 13:04:08 +010090#define DST_METRICS_READ_ONLY 0x1UL
Eric Dumazet3fb07da2017-05-25 14:27:35 -070091#define DST_METRICS_REFCOUNTED 0x2UL
Michal Kubečeke5fd3872014-03-27 13:04:08 +010092#define DST_METRICS_FLAGS 0x3UL
David S. Miller62fa8a82011-01-26 20:51:05 -080093#define __DST_METRICS_PTR(Y) \
Michal Kubečeke5fd3872014-03-27 13:04:08 +010094 ((u32 *)((Y) & ~DST_METRICS_FLAGS))
David S. Miller62fa8a82011-01-26 20:51:05 -080095#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
96
97static inline bool dst_metrics_read_only(const struct dst_entry *dst)
98{
99 return dst->_metrics & DST_METRICS_READ_ONLY;
100}
101
Joe Perchesa4023dd2013-09-20 11:23:21 -0700102void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -0800103
104static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
105{
106 unsigned long val = dst->_metrics;
107 if (!(val & DST_METRICS_READ_ONLY))
108 __dst_destroy_metrics_generic(dst, val);
109}
110
111static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
112{
113 unsigned long p = dst->_metrics;
114
Stephen Hemminger1f370702011-05-24 13:50:52 -0400115 BUG_ON(!p);
116
David S. Miller62fa8a82011-01-26 20:51:05 -0800117 if (p & DST_METRICS_READ_ONLY)
118 return dst->ops->cow_metrics(dst, p);
119 return __DST_METRICS_PTR(p);
120}
121
122/* This may only be invoked before the entry has reached global
123 * visibility.
124 */
125static inline void dst_init_metrics(struct dst_entry *dst,
126 const u32 *src_metrics,
127 bool read_only)
128{
129 dst->_metrics = ((unsigned long) src_metrics) |
130 (read_only ? DST_METRICS_READ_ONLY : 0);
131}
132
133static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
134{
135 u32 *dst_metrics = dst_metrics_write_ptr(dest);
136
137 if (dst_metrics) {
138 u32 *src_metrics = DST_METRICS_PTR(src);
139
140 memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
141 }
142}
143
144static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
145{
146 return DST_METRICS_PTR(dst);
147}
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149static inline u32
David S. Miller5170ae82010-12-12 21:35:57 -0800150dst_metric_raw(const struct dst_entry *dst, const int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
David S. Miller62fa8a82011-01-26 20:51:05 -0800152 u32 *p = DST_METRICS_PTR(dst);
153
154 return p[metric-1];
David S. Millerdefb3512010-12-08 21:16:57 -0800155}
156
David S. Miller5170ae82010-12-12 21:35:57 -0800157static inline u32
158dst_metric(const struct dst_entry *dst, const int metric)
159{
David S. Miller0dbaee32010-12-13 12:52:14 -0800160 WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
David S. Millerd33e4552010-12-14 13:01:14 -0800161 metric == RTAX_ADVMSS ||
162 metric == RTAX_MTU);
David S. Miller5170ae82010-12-12 21:35:57 -0800163 return dst_metric_raw(dst, metric);
164}
165
David S. Miller0dbaee32010-12-13 12:52:14 -0800166static inline u32
167dst_metric_advmss(const struct dst_entry *dst)
168{
169 u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
170
171 if (!advmss)
172 advmss = dst->ops->default_advmss(dst);
173
174 return advmss;
175}
176
David S. Millerdefb3512010-12-08 21:16:57 -0800177static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
178{
David S. Miller62fa8a82011-01-26 20:51:05 -0800179 u32 *p = dst_metrics_write_ptr(dst);
David S. Millerdefb3512010-12-08 21:16:57 -0800180
David S. Miller62fa8a82011-01-26 20:51:05 -0800181 if (p)
182 p[metric-1] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Daniel Borkmannc3a8d942015-08-31 15:58:47 +0200185/* Kernel-internal feature bits that are unallocated in user space. */
186#define DST_FEATURE_ECN_CA (1 << 31)
187
188#define DST_FEATURE_MASK (DST_FEATURE_ECN_CA)
189#define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN)
190
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000191static inline u32
192dst_feature(const struct dst_entry *dst, u32 feature)
193{
David S. Millerbb5b7c12009-12-15 20:56:42 -0800194 return dst_metric(dst, RTAX_FEATURES) & feature;
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000195}
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197static inline u32 dst_mtu(const struct dst_entry *dst)
198{
Steffen Klassert618f9bc2011-11-23 02:13:31 +0000199 return dst->ops->mtu(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
Stephen Hemmingerc1e20f72008-07-18 23:02:15 -0700202/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
203static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
204{
205 return msecs_to_jiffies(dst_metric(dst, metric));
206}
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208static inline u32
209dst_allfrag(const struct dst_entry *dst)
210{
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000211 int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 return ret;
213}
214
215static inline int
David S. Millerd33e4552010-12-14 13:01:14 -0800216dst_metric_locked(const struct dst_entry *dst, int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 return dst_metric(dst, RTAX_LOCK) & (1<<metric);
219}
220
Eldad Zack7f95e182012-06-16 15:14:49 +0200221static inline void dst_hold(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Eric Dumazet5635c102008-11-16 19:46:36 -0800223 /*
224 * If your kernel compilation stops here, please check
David Miller8b207e72017-11-28 15:40:53 -0500225 * the placement of __refcnt in struct dst_entry
Eric Dumazet5635c102008-11-16 19:46:36 -0800226 */
227 BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
Wei Wang44ebe792017-06-17 10:42:44 -0700228 WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
Eric Dumazet7fee2262010-05-11 23:19:48 +0000231static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
232{
Paolo Abeni32d18ab2017-10-24 12:41:01 +0200233 if (unlikely(time != dst->lastuse)) {
Wei Wang0da4af02017-10-13 15:08:07 -0700234 dst->__use++;
235 dst->lastuse = time;
236 }
237}
238
239static inline void dst_hold_and_use(struct dst_entry *dst, unsigned long time)
240{
241 dst_hold(dst);
242 dst_use_noref(dst, time);
Eric Dumazet7fee2262010-05-11 23:19:48 +0000243}
244
Eldad Zack7f95e182012-06-16 15:14:49 +0200245static inline struct dst_entry *dst_clone(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 if (dst)
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700248 dst_hold(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return dst;
250}
251
Joe Perchesa4023dd2013-09-20 11:23:21 -0700252void dst_release(struct dst_entry *dst);
Eric Dumazet7fee2262010-05-11 23:19:48 +0000253
Wei Wang5f56f402017-06-17 10:42:27 -0700254void dst_release_immediate(struct dst_entry *dst);
255
Eric Dumazet7fee2262010-05-11 23:19:48 +0000256static inline void refdst_drop(unsigned long refdst)
257{
258 if (!(refdst & SKB_DST_NOREF))
259 dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
260}
261
262/**
263 * skb_dst_drop - drops skb dst
264 * @skb: buffer
265 *
266 * Drops dst reference count if a reference was taken.
267 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000268static inline void skb_dst_drop(struct sk_buff *skb)
269{
Eric Dumazet7fee2262010-05-11 23:19:48 +0000270 if (skb->_skb_refdst) {
271 refdst_drop(skb->_skb_refdst);
272 skb->_skb_refdst = 0UL;
273 }
274}
275
Joe Stringere79e2592015-08-26 11:31:47 -0700276static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst)
Eric Dumazet7fee2262010-05-11 23:19:48 +0000277{
Joe Stringere79e2592015-08-26 11:31:47 -0700278 nskb->_skb_refdst = refdst;
Eric Dumazet7fee2262010-05-11 23:19:48 +0000279 if (!(nskb->_skb_refdst & SKB_DST_NOREF))
280 dst_clone(skb_dst(nskb));
281}
282
Joe Stringere79e2592015-08-26 11:31:47 -0700283static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
284{
285 __skb_dst_copy(nskb, oskb->_skb_refdst);
286}
287
Eric Dumazet7fee2262010-05-11 23:19:48 +0000288/**
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800289 * dst_hold_safe - Take a reference on a dst if possible
290 * @dst: pointer to dst entry
291 *
292 * This helper returns false if it could not safely
293 * take a reference on a dst.
294 */
295static inline bool dst_hold_safe(struct dst_entry *dst)
296{
Wei Wangb2a9c0e2017-06-17 10:42:41 -0700297 return atomic_inc_not_zero(&dst->__refcnt);
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800298}
299
300/**
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700301 * skb_dst_force - makes sure skb dst is refcounted
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800302 * @skb: buffer
303 *
304 * If dst is not yet refcounted and not destroyed, grab a ref on it.
305 */
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700306static inline void skb_dst_force(struct sk_buff *skb)
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800307{
308 if (skb_dst_is_noref(skb)) {
309 struct dst_entry *dst = skb_dst(skb);
310
Eric Dumazet222d7dbd2017-09-21 09:15:46 -0700311 WARN_ON(!rcu_read_lock_held());
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800312 if (!dst_hold_safe(dst))
313 dst = NULL;
314
315 skb->_skb_refdst = (unsigned long)dst;
316 }
317}
318
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700319
320/**
Eric Dumazet290b8952010-09-27 00:33:35 +0000321 * __skb_tunnel_rx - prepare skb for rx reinsert
322 * @skb: buffer
323 * @dev: tunnel device
Nicolas Dichtelea231922013-09-02 15:34:58 +0200324 * @net: netns for packet i/o
Eric Dumazet290b8952010-09-27 00:33:35 +0000325 *
326 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
327 * so make some cleanups. (no accounting done)
328 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200329static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
330 struct net *net)
Eric Dumazet290b8952010-09-27 00:33:35 +0000331{
332 skb->dev = dev;
Tom Herbertbdeab992011-08-14 19:45:55 +0000333
334 /*
Tom Herbert7539fad2013-12-15 22:12:18 -0800335 * Clear hash so that we can recalulate the hash for the
Tom Herbertbdeab992011-08-14 19:45:55 +0000336 * encapsulated packet, unless we have already determine the hash
337 * over the L4 4-tuple.
338 */
Tom Herbert7539fad2013-12-15 22:12:18 -0800339 skb_clear_hash_if_not_l4(skb);
Eric Dumazet290b8952010-09-27 00:33:35 +0000340 skb_set_queue_mapping(skb, 0);
Nicolas Dichtelea231922013-09-02 15:34:58 +0200341 skb_scrub_packet(skb, !net_eq(net, dev_net(dev)));
Eric Dumazet290b8952010-09-27 00:33:35 +0000342}
343
344/**
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700345 * skb_tunnel_rx - prepare skb for rx reinsert
346 * @skb: buffer
347 * @dev: tunnel device
Jonathan Neuschäfer8eb1a852018-03-04 03:29:53 +0100348 * @net: netns for packet i/o
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700349 *
350 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
351 * so make some cleanups, and perform accounting.
Eric Dumazet290b8952010-09-27 00:33:35 +0000352 * Note: this accounting is not SMP safe.
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700353 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200354static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
355 struct net *net)
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700356{
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700357 /* TODO : stats should be SMP safe */
358 dev->stats.rx_packets++;
359 dev->stats.rx_bytes += skb->len;
Nicolas Dichtelea231922013-09-02 15:34:58 +0200360 __skb_tunnel_rx(skb, dev, net);
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700361}
362
Daniel Borkmann808c1b62016-03-16 01:42:50 +0100363static inline u32 dst_tclassid(const struct sk_buff *skb)
364{
365#ifdef CONFIG_IP_ROUTE_CLASSID
366 const struct dst_entry *dst;
367
368 dst = skb_dst(skb);
369 if (dst)
370 return dst->tclassid;
371#endif
372 return 0;
373}
374
Eric W. Biedermanede20592015-10-07 16:48:47 -0500375int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400376static inline int dst_discard(struct sk_buff *skb)
377{
Eric W. Biedermanede20592015-10-07 16:48:47 -0500378 return dst_discard_out(&init_net, skb->sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400379}
Joe Perchesa4023dd2013-09-20 11:23:21 -0700380void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
381 int initial_obsolete, unsigned short flags);
Thomas Graff38a9eb2015-07-21 10:43:56 +0200382void dst_init(struct dst_entry *dst, struct dst_ops *ops,
383 struct net_device *dev, int initial_ref, int initial_obsolete,
384 unsigned short flags);
Joe Perchesa4023dd2013-09-20 11:23:21 -0700385struct dst_entry *dst_destroy(struct dst_entry *dst);
Wei Wang4a6ce2b2017-06-17 10:42:28 -0700386void dst_dev_put(struct dst_entry *dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388static inline void dst_confirm(struct dst_entry *dst)
389{
David S. Miller5110effe2012-07-02 02:21:03 -0700390}
Eric Dumazetf2c31e32011-07-29 19:00:53 +0000391
David S. Millerd3aaeb32011-07-18 00:40:17 -0700392static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
393{
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000394 struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr);
395 return IS_ERR(n) ? NULL : n;
David S. Millerf894cbf2012-07-02 21:52:24 -0700396}
397
398static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
399 struct sk_buff *skb)
400{
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000401 struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL);
402 return IS_ERR(n) ? NULL : n;
David S. Millerd3aaeb32011-07-18 00:40:17 -0700403}
404
Julian Anastasov63fca652017-02-06 23:14:15 +0200405static inline void dst_confirm_neigh(const struct dst_entry *dst,
406 const void *daddr)
407{
408 if (dst->ops->confirm_neigh)
409 dst->ops->confirm_neigh(dst, daddr);
410}
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412static inline void dst_link_failure(struct sk_buff *skb)
413{
Eric Dumazetadf30902009-06-02 05:19:30 +0000414 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (dst && dst->ops && dst->ops->link_failure)
416 dst->ops->link_failure(skb);
417}
418
419static inline void dst_set_expires(struct dst_entry *dst, int timeout)
420{
421 unsigned long expires = jiffies + timeout;
422
423 if (expires == 0)
424 expires = 1;
425
426 if (dst->expires == 0 || time_before(expires, dst->expires))
427 dst->expires = expires;
428}
429
430/* Output packet to network from transport. */
Eric W. Biederman13206b62015-10-07 16:48:35 -0500431static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
Eric Dumazetaad88722014-04-15 13:47:15 -0400432{
Eric W. Biedermanede20592015-10-07 16:48:47 -0500433 return skb_dst(skb)->output(net, sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400434}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436/* Input packet from network to transport. */
437static inline int dst_input(struct sk_buff *skb)
438{
Eric Dumazetadf30902009-06-02 05:19:30 +0000439 return skb_dst(skb)->input(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
442static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
443{
444 if (dst->obsolete)
445 dst = dst->ops->check(dst, cookie);
446 return dst;
447}
448
Herbert Xu815f4e52007-12-12 10:36:59 -0800449/* Flags for xfrm_lookup flags argument. */
450enum {
David S. Miller80c0bc92011-03-01 14:36:37 -0800451 XFRM_LOOKUP_ICMP = 1 << 0,
Steffen Klassertb8c203b2014-09-16 10:08:49 +0200452 XFRM_LOOKUP_QUEUE = 1 << 1,
huaibin Wangac37e252015-02-11 18:10:36 +0100453 XFRM_LOOKUP_KEEP_DST_REF = 1 << 2,
Herbert Xu815f4e52007-12-12 10:36:59 -0800454};
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456struct flowi;
457#ifndef CONFIG_XFRM
David S. Miller452edd52011-03-02 13:27:41 -0800458static inline struct dst_entry *xfrm_lookup(struct net *net,
459 struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700460 const struct flowi *fl,
461 const struct sock *sk,
David S. Miller452edd52011-03-02 13:27:41 -0800462 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
David S. Miller452edd52011-03-02 13:27:41 -0800464 return dst_orig;
Steffen Klassertf92ee612014-09-16 10:08:40 +0200465}
466
Benedict Wongbc56b332018-07-19 10:50:44 -0700467static inline struct dst_entry *
468xfrm_lookup_with_ifid(struct net *net, struct dst_entry *dst_orig,
469 const struct flowi *fl, const struct sock *sk,
470 int flags, u32 if_id)
471{
472 return dst_orig;
473}
474
Steffen Klassertf92ee612014-09-16 10:08:40 +0200475static inline struct dst_entry *xfrm_lookup_route(struct net *net,
476 struct dst_entry *dst_orig,
477 const struct flowi *fl,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700478 const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200479 int flags)
480{
481 return dst_orig;
482}
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400483
484static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
485{
486 return NULL;
487}
488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489#else
Joe Perchesa4023dd2013-09-20 11:23:21 -0700490struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700491 const struct flowi *fl, const struct sock *sk,
Joe Perchesa4023dd2013-09-20 11:23:21 -0700492 int flags);
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400493
Benedict Wongbc56b332018-07-19 10:50:44 -0700494struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
495 struct dst_entry *dst_orig,
496 const struct flowi *fl,
497 const struct sock *sk, int flags,
498 u32 if_id);
499
Steffen Klassertf92ee612014-09-16 10:08:40 +0200500struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700501 const struct flowi *fl, const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200502 int flags);
503
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400504/* skb attached with this dst needs transformation if dst->xfrm is valid */
505static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
506{
507 return dst->xfrm;
508}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Nicolas Dichtelf15ca722018-01-25 19:03:03 +0100511static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
512{
513 struct dst_entry *dst = skb_dst(skb);
514
515 if (dst && dst->ops->update_pmtu)
516 dst->ops->update_pmtu(dst, NULL, skb, mtu);
517}
518
Stefano Brivio6b4f92a2018-10-12 23:53:59 +0200519static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
520 struct dst_entry *encap_dst,
521 int headroom)
522{
523 u32 encap_mtu = dst_mtu(encap_dst);
524
525 if (skb->len > encap_mtu - headroom)
526 skb_dst_update_pmtu(skb, encap_mtu - headroom);
527}
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529#endif /* _NET_DST_H */