blob: ddcff17615da6ccf46271a61e2cdcb82d923938d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/dst.h Protocol independent destination cache definitions.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 */
7
8#ifndef _NET_DST_H
9#define _NET_DST_H
10
Alexey Dobriyan86393e52009-08-29 01:34:49 +000011#include <net/dst_ops.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020012#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/rtnetlink.h>
14#include <linux/rcupdate.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050015#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/jiffies.h>
17#include <net/neighbour.h>
18#include <asm/processor.h>
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#define DST_GC_MIN (HZ/10)
21#define DST_GC_INC (HZ/2)
22#define DST_GC_MAX (120*HZ)
23
24/* Each dst_entry has reference count and sits in some parent list(s).
25 * When it is removed from parent list, it is "freed" (dst_free).
26 * After this it enters dead state (dst->obsolete > 0) and if its refcnt
27 * is zero, it can be destroyed immediately, otherwise it is added
28 * to gc list and garbage collector periodically checks the refcnt.
29 */
30
31struct sk_buff;
32
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000033struct dst_entry {
Eric Dumazet1e19e022007-02-09 16:26:55 -080034 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 struct dst_entry *child;
36 struct net_device *dev;
David S. Miller62fa8a82011-01-26 20:51:05 -080037 struct dst_ops *ops;
38 unsigned long _metrics;
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +000039 unsigned long expires;
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070040 struct dst_entry *path;
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +000041 struct dst_entry *from;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070042#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct xfrm_state *xfrm;
Eric Dumazet5635c102008-11-16 19:46:36 -080044#else
45 void *__pad1;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -070046#endif
Eldad Zack7f95e182012-06-16 15:14:49 +020047 int (*input)(struct sk_buff *);
Eric W. Biedermanede20592015-10-07 16:48:47 -050048 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
David S. Miller5110effe2012-07-02 02:21:03 -070050 unsigned short flags;
David S. Millerf6b72b62011-07-14 07:53:20 -070051#define DST_HOST 0x0001
52#define DST_NOXFRM 0x0002
53#define DST_NOPOLICY 0x0004
54#define DST_NOHASH 0x0008
55#define DST_NOCACHE 0x0010
56#define DST_NOCOUNT 0x0020
Hannes Frederic Sowae90c1482014-03-06 09:11:07 +010057#define DST_FAKE_RTABLE 0x0040
58#define DST_XFRM_TUNNEL 0x0080
59#define DST_XFRM_QUEUE 0x0100
Thomas Graff38a9eb2015-07-21 10:43:56 +020060#define DST_METADATA 0x0200
David S. Millerf6b72b62011-07-14 07:53:20 -070061
David S. Miller5110effe2012-07-02 02:21:03 -070062 unsigned short pending_confirm;
63
David S. Miller62fa8a82011-01-26 20:51:05 -080064 short error;
David S. Millerf5b0a872012-07-19 12:31:33 -070065
66 /* A non-zero value of dst->obsolete forces by-hand validation
67 * of the route entry. Positive values are set by the generic
68 * dst layer to indicate that the entry has been forcefully
69 * destroyed.
70 *
71 * Negative values are used by the implementation layer code to
72 * force invocation of the dst_ops->check() method.
73 */
David S. Miller62fa8a82011-01-26 20:51:05 -080074 short obsolete;
David S. Millerf5b0a872012-07-19 12:31:33 -070075#define DST_OBSOLETE_NONE 0
76#define DST_OBSOLETE_DEAD 2
77#define DST_OBSOLETE_FORCE_CHK -1
David S. Millerceb33202012-07-17 11:31:28 -070078#define DST_OBSOLETE_KILL -2
David S. Miller62fa8a82011-01-26 20:51:05 -080079 unsigned short header_len; /* more space at head required */
80 unsigned short trailer_len; /* space to reserve at tail */
Patrick McHardyc7066f72011-01-14 13:36:42 +010081#ifdef CONFIG_IP_ROUTE_CLASSID
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070082 __u32 tclassid;
Eric Dumazet5635c102008-11-16 19:46:36 -080083#else
84 __u32 __pad2;
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070085#endif
86
Jiri Benc751a5872015-08-21 12:41:14 +020087#ifdef CONFIG_64BIT
Eric Dumazet5635c102008-11-16 19:46:36 -080088 /*
89 * Align __refcnt to a 64 bytes alignment
90 * (L1_CACHE_SIZE would be too much)
91 */
Jiri Benc0868e252016-04-22 12:40:02 +020092 long __pad_to_align_refcnt[2];
Eric Dumazet5635c102008-11-16 19:46:36 -080093#endif
Zhang Yanminf1dd9c32008-03-12 22:52:37 -070094 /*
95 * __refcnt wants to be on a different cache line from
96 * input/output/ops or performance tanks badly
97 */
Eric Dumazet1e19e022007-02-09 16:26:55 -080098 atomic_t __refcnt; /* client references */
99 int __use;
Zhang Yanminf1dd9c32008-03-12 22:52:37 -0700100 unsigned long lastuse;
Jiri Benc751a5872015-08-21 12:41:14 +0200101 struct lwtunnel_state *lwtstate;
Eric Dumazet1e19e022007-02-09 16:26:55 -0800102 union {
Eric Dumazetfc766e4c2010-10-29 03:09:24 +0000103 struct dst_entry *next;
104 struct rtable __rcu *rt_next;
105 struct rt6_info *rt6_next;
106 struct dn_route __rcu *dn_next;
Eric Dumazet1e19e022007-02-09 16:26:55 -0800107 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
Eric Dumazet988b9792017-05-25 14:27:35 -0700110struct dst_metrics {
111 u32 metrics[RTAX_MAX];
112 atomic_t refcnt;
113};
114extern const struct dst_metrics dst_default_metrics;
115
Joe Perchesa4023dd2013-09-20 11:23:21 -0700116u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -0800117
Michal Kubečeke5fd3872014-03-27 13:04:08 +0100118#define DST_METRICS_READ_ONLY 0x1UL
Eric Dumazet988b9792017-05-25 14:27:35 -0700119#define DST_METRICS_REFCOUNTED 0x2UL
Michal Kubečeke5fd3872014-03-27 13:04:08 +0100120#define DST_METRICS_FLAGS 0x3UL
David S. Miller62fa8a82011-01-26 20:51:05 -0800121#define __DST_METRICS_PTR(Y) \
Michal Kubečeke5fd3872014-03-27 13:04:08 +0100122 ((u32 *)((Y) & ~DST_METRICS_FLAGS))
David S. Miller62fa8a82011-01-26 20:51:05 -0800123#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
124
125static inline bool dst_metrics_read_only(const struct dst_entry *dst)
126{
127 return dst->_metrics & DST_METRICS_READ_ONLY;
128}
129
Joe Perchesa4023dd2013-09-20 11:23:21 -0700130void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
David S. Miller62fa8a82011-01-26 20:51:05 -0800131
132static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
133{
134 unsigned long val = dst->_metrics;
135 if (!(val & DST_METRICS_READ_ONLY))
136 __dst_destroy_metrics_generic(dst, val);
137}
138
139static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
140{
141 unsigned long p = dst->_metrics;
142
Stephen Hemminger1f370702011-05-24 13:50:52 -0400143 BUG_ON(!p);
144
David S. Miller62fa8a82011-01-26 20:51:05 -0800145 if (p & DST_METRICS_READ_ONLY)
146 return dst->ops->cow_metrics(dst, p);
147 return __DST_METRICS_PTR(p);
148}
149
150/* This may only be invoked before the entry has reached global
151 * visibility.
152 */
153static inline void dst_init_metrics(struct dst_entry *dst,
154 const u32 *src_metrics,
155 bool read_only)
156{
157 dst->_metrics = ((unsigned long) src_metrics) |
158 (read_only ? DST_METRICS_READ_ONLY : 0);
159}
160
161static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
162{
163 u32 *dst_metrics = dst_metrics_write_ptr(dest);
164
165 if (dst_metrics) {
166 u32 *src_metrics = DST_METRICS_PTR(src);
167
168 memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
169 }
170}
171
172static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
173{
174 return DST_METRICS_PTR(dst);
175}
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static inline u32
David S. Miller5170ae82010-12-12 21:35:57 -0800178dst_metric_raw(const struct dst_entry *dst, const int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
David S. Miller62fa8a82011-01-26 20:51:05 -0800180 u32 *p = DST_METRICS_PTR(dst);
181
182 return p[metric-1];
David S. Millerdefb3512010-12-08 21:16:57 -0800183}
184
David S. Miller5170ae82010-12-12 21:35:57 -0800185static inline u32
186dst_metric(const struct dst_entry *dst, const int metric)
187{
David S. Miller0dbaee32010-12-13 12:52:14 -0800188 WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
David S. Millerd33e4552010-12-14 13:01:14 -0800189 metric == RTAX_ADVMSS ||
190 metric == RTAX_MTU);
David S. Miller5170ae82010-12-12 21:35:57 -0800191 return dst_metric_raw(dst, metric);
192}
193
David S. Miller0dbaee32010-12-13 12:52:14 -0800194static inline u32
195dst_metric_advmss(const struct dst_entry *dst)
196{
197 u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
198
199 if (!advmss)
200 advmss = dst->ops->default_advmss(dst);
201
202 return advmss;
203}
204
David S. Millerdefb3512010-12-08 21:16:57 -0800205static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
206{
David S. Miller62fa8a82011-01-26 20:51:05 -0800207 u32 *p = dst_metrics_write_ptr(dst);
David S. Millerdefb3512010-12-08 21:16:57 -0800208
David S. Miller62fa8a82011-01-26 20:51:05 -0800209 if (p)
210 p[metric-1] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
Daniel Borkmannc3a8d942015-08-31 15:58:47 +0200213/* Kernel-internal feature bits that are unallocated in user space. */
214#define DST_FEATURE_ECN_CA (1 << 31)
215
216#define DST_FEATURE_MASK (DST_FEATURE_ECN_CA)
217#define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN)
218
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000219static inline u32
220dst_feature(const struct dst_entry *dst, u32 feature)
221{
David S. Millerbb5b7c12009-12-15 20:56:42 -0800222 return dst_metric(dst, RTAX_FEATURES) & feature;
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000223}
224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225static inline u32 dst_mtu(const struct dst_entry *dst)
226{
Steffen Klassert618f9bc2011-11-23 02:13:31 +0000227 return dst->ops->mtu(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
Stephen Hemmingerc1e20f72008-07-18 23:02:15 -0700230/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
231static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric)
232{
233 return msecs_to_jiffies(dst_metric(dst, metric));
234}
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236static inline u32
237dst_allfrag(const struct dst_entry *dst)
238{
Gilad Ben-Yossef0c3adfb2009-10-28 04:15:23 +0000239 int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 return ret;
241}
242
243static inline int
David S. Millerd33e4552010-12-14 13:01:14 -0800244dst_metric_locked(const struct dst_entry *dst, int metric)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 return dst_metric(dst, RTAX_LOCK) & (1<<metric);
247}
248
Eldad Zack7f95e182012-06-16 15:14:49 +0200249static inline void dst_hold(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Eric Dumazet5635c102008-11-16 19:46:36 -0800251 /*
252 * If your kernel compilation stops here, please check
253 * __pad_to_align_refcnt declaration in struct dst_entry
254 */
255 BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 atomic_inc(&dst->__refcnt);
257}
258
Pavel Emelyanov03f49f32007-11-10 21:28:34 -0800259static inline void dst_use(struct dst_entry *dst, unsigned long time)
260{
261 dst_hold(dst);
262 dst->__use++;
263 dst->lastuse = time;
264}
265
Eric Dumazet7fee2262010-05-11 23:19:48 +0000266static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
267{
268 dst->__use++;
269 dst->lastuse = time;
270}
271
Eldad Zack7f95e182012-06-16 15:14:49 +0200272static inline struct dst_entry *dst_clone(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
274 if (dst)
275 atomic_inc(&dst->__refcnt);
276 return dst;
277}
278
Joe Perchesa4023dd2013-09-20 11:23:21 -0700279void dst_release(struct dst_entry *dst);
Eric Dumazet7fee2262010-05-11 23:19:48 +0000280
281static inline void refdst_drop(unsigned long refdst)
282{
283 if (!(refdst & SKB_DST_NOREF))
284 dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
285}
286
287/**
288 * skb_dst_drop - drops skb dst
289 * @skb: buffer
290 *
291 * Drops dst reference count if a reference was taken.
292 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000293static inline void skb_dst_drop(struct sk_buff *skb)
294{
Eric Dumazet7fee2262010-05-11 23:19:48 +0000295 if (skb->_skb_refdst) {
296 refdst_drop(skb->_skb_refdst);
297 skb->_skb_refdst = 0UL;
298 }
299}
300
Joe Stringere79e2592015-08-26 11:31:47 -0700301static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst)
Eric Dumazet7fee2262010-05-11 23:19:48 +0000302{
Joe Stringere79e2592015-08-26 11:31:47 -0700303 nskb->_skb_refdst = refdst;
Eric Dumazet7fee2262010-05-11 23:19:48 +0000304 if (!(nskb->_skb_refdst & SKB_DST_NOREF))
305 dst_clone(skb_dst(nskb));
306}
307
Joe Stringere79e2592015-08-26 11:31:47 -0700308static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
309{
310 __skb_dst_copy(nskb, oskb->_skb_refdst);
311}
312
Eric Dumazet7fee2262010-05-11 23:19:48 +0000313/**
314 * skb_dst_force - makes sure skb dst is refcounted
315 * @skb: buffer
316 *
317 * If dst is not yet refcounted, let's do it
318 */
319static inline void skb_dst_force(struct sk_buff *skb)
320{
321 if (skb_dst_is_noref(skb)) {
322 WARN_ON(!rcu_read_lock_held());
323 skb->_skb_refdst &= ~SKB_DST_NOREF;
324 dst_clone(skb_dst(skb));
325 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000326}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Eric Dumazet5037e9e2015-12-14 14:08:53 -0800328/**
329 * dst_hold_safe - Take a reference on a dst if possible
330 * @dst: pointer to dst entry
331 *
332 * This helper returns false if it could not safely
333 * take a reference on a dst.
334 */
335static inline bool dst_hold_safe(struct dst_entry *dst)
336{
337 if (dst->flags & DST_NOCACHE)
338 return atomic_inc_not_zero(&dst->__refcnt);
339 dst_hold(dst);
340 return true;
341}
342
343/**
344 * skb_dst_force_safe - makes sure skb dst is refcounted
345 * @skb: buffer
346 *
347 * If dst is not yet refcounted and not destroyed, grab a ref on it.
348 */
349static inline void skb_dst_force_safe(struct sk_buff *skb)
350{
351 if (skb_dst_is_noref(skb)) {
352 struct dst_entry *dst = skb_dst(skb);
353
354 if (!dst_hold_safe(dst))
355 dst = NULL;
356
357 skb->_skb_refdst = (unsigned long)dst;
358 }
359}
360
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700361
362/**
Eric Dumazet290b8952010-09-27 00:33:35 +0000363 * __skb_tunnel_rx - prepare skb for rx reinsert
364 * @skb: buffer
365 * @dev: tunnel device
Nicolas Dichtelea231922013-09-02 15:34:58 +0200366 * @net: netns for packet i/o
Eric Dumazet290b8952010-09-27 00:33:35 +0000367 *
368 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
369 * so make some cleanups. (no accounting done)
370 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200371static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
372 struct net *net)
Eric Dumazet290b8952010-09-27 00:33:35 +0000373{
374 skb->dev = dev;
Tom Herbertbdeab992011-08-14 19:45:55 +0000375
376 /*
Tom Herbert7539fad2013-12-15 22:12:18 -0800377 * Clear hash so that we can recalulate the hash for the
Tom Herbertbdeab992011-08-14 19:45:55 +0000378 * encapsulated packet, unless we have already determine the hash
379 * over the L4 4-tuple.
380 */
Tom Herbert7539fad2013-12-15 22:12:18 -0800381 skb_clear_hash_if_not_l4(skb);
Eric Dumazet290b8952010-09-27 00:33:35 +0000382 skb_set_queue_mapping(skb, 0);
Nicolas Dichtelea231922013-09-02 15:34:58 +0200383 skb_scrub_packet(skb, !net_eq(net, dev_net(dev)));
Eric Dumazet290b8952010-09-27 00:33:35 +0000384}
385
386/**
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700387 * skb_tunnel_rx - prepare skb for rx reinsert
388 * @skb: buffer
389 * @dev: tunnel device
390 *
391 * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
392 * so make some cleanups, and perform accounting.
Eric Dumazet290b8952010-09-27 00:33:35 +0000393 * Note: this accounting is not SMP safe.
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700394 */
Nicolas Dichtelea231922013-09-02 15:34:58 +0200395static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
396 struct net *net)
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700397{
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700398 /* TODO : stats should be SMP safe */
399 dev->stats.rx_packets++;
400 dev->stats.rx_bytes += skb->len;
Nicolas Dichtelea231922013-09-02 15:34:58 +0200401 __skb_tunnel_rx(skb, dev, net);
Eric Dumazetd19d56d2010-05-17 22:36:55 -0700402}
403
Daniel Borkmann808c1b62016-03-16 01:42:50 +0100404static inline u32 dst_tclassid(const struct sk_buff *skb)
405{
406#ifdef CONFIG_IP_ROUTE_CLASSID
407 const struct dst_entry *dst;
408
409 dst = skb_dst(skb);
410 if (dst)
411 return dst->tclassid;
412#endif
413 return 0;
414}
415
Eric W. Biedermanede20592015-10-07 16:48:47 -0500416int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400417static inline int dst_discard(struct sk_buff *skb)
418{
Eric W. Biedermanede20592015-10-07 16:48:47 -0500419 return dst_discard_out(&init_net, skb->sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400420}
Joe Perchesa4023dd2013-09-20 11:23:21 -0700421void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
422 int initial_obsolete, unsigned short flags);
Thomas Graff38a9eb2015-07-21 10:43:56 +0200423void dst_init(struct dst_entry *dst, struct dst_ops *ops,
424 struct net_device *dev, int initial_ref, int initial_obsolete,
425 unsigned short flags);
Joe Perchesa4023dd2013-09-20 11:23:21 -0700426void __dst_free(struct dst_entry *dst);
427struct dst_entry *dst_destroy(struct dst_entry *dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Eldad Zack7f95e182012-06-16 15:14:49 +0200429static inline void dst_free(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
David S. Millerf5b0a872012-07-19 12:31:33 -0700431 if (dst->obsolete > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 return;
433 if (!atomic_read(&dst->__refcnt)) {
434 dst = dst_destroy(dst);
435 if (!dst)
436 return;
437 }
438 __dst_free(dst);
439}
440
441static inline void dst_rcu_free(struct rcu_head *head)
442{
443 struct dst_entry *dst = container_of(head, struct dst_entry, rcu_head);
444 dst_free(dst);
445}
446
447static inline void dst_confirm(struct dst_entry *dst)
448{
David S. Miller5110effe2012-07-02 02:21:03 -0700449 dst->pending_confirm = 1;
450}
Eric Dumazetf2c31e32011-07-29 19:00:53 +0000451
David S. Miller5110effe2012-07-02 02:21:03 -0700452static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
453 struct sk_buff *skb)
454{
Eric Dumazet425f09a2012-08-07 02:19:56 +0000455 const struct hh_cache *hh;
David S. Miller5110effe2012-07-02 02:21:03 -0700456
Eric Dumazet425f09a2012-08-07 02:19:56 +0000457 if (dst->pending_confirm) {
458 unsigned long now = jiffies;
459
David S. Miller5110effe2012-07-02 02:21:03 -0700460 dst->pending_confirm = 0;
Eric Dumazet425f09a2012-08-07 02:19:56 +0000461 /* avoid dirtying neighbour */
462 if (n->confirmed != now)
463 n->confirmed = now;
David S. Miller69cce1d2011-07-17 23:09:49 -0700464 }
David S. Miller5110effe2012-07-02 02:21:03 -0700465
466 hh = &n->hh;
467 if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
468 return neigh_hh_output(hh, skb);
469 else
470 return n->output(n, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
David S. Millerd3aaeb32011-07-18 00:40:17 -0700473static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)
474{
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000475 struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr);
476 return IS_ERR(n) ? NULL : n;
David S. Millerf894cbf2012-07-02 21:52:24 -0700477}
478
479static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,
480 struct sk_buff *skb)
481{
Zhouyi Zhouaaa0c232013-03-14 17:21:50 +0000482 struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL);
483 return IS_ERR(n) ? NULL : n;
David S. Millerd3aaeb32011-07-18 00:40:17 -0700484}
485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486static inline void dst_link_failure(struct sk_buff *skb)
487{
Eric Dumazetadf30902009-06-02 05:19:30 +0000488 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 if (dst && dst->ops && dst->ops->link_failure)
490 dst->ops->link_failure(skb);
491}
492
493static inline void dst_set_expires(struct dst_entry *dst, int timeout)
494{
495 unsigned long expires = jiffies + timeout;
496
497 if (expires == 0)
498 expires = 1;
499
500 if (dst->expires == 0 || time_before(expires, dst->expires))
501 dst->expires = expires;
502}
503
504/* Output packet to network from transport. */
Eric W. Biederman13206b62015-10-07 16:48:35 -0500505static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
Eric Dumazetaad88722014-04-15 13:47:15 -0400506{
Eric W. Biedermanede20592015-10-07 16:48:47 -0500507 return skb_dst(skb)->output(net, sk, skb);
Eric Dumazetaad88722014-04-15 13:47:15 -0400508}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510/* Input packet from network to transport. */
511static inline int dst_input(struct sk_buff *skb)
512{
Eric Dumazetadf30902009-06-02 05:19:30 +0000513 return skb_dst(skb)->input(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514}
515
516static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
517{
518 if (dst->obsolete)
519 dst = dst->ops->check(dst, cookie);
520 return dst;
521}
522
Thomas Graff38a9eb2015-07-21 10:43:56 +0200523void dst_subsys_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Herbert Xu815f4e52007-12-12 10:36:59 -0800525/* Flags for xfrm_lookup flags argument. */
526enum {
David S. Miller80c0bc92011-03-01 14:36:37 -0800527 XFRM_LOOKUP_ICMP = 1 << 0,
Steffen Klassertb8c203b2014-09-16 10:08:49 +0200528 XFRM_LOOKUP_QUEUE = 1 << 1,
huaibin Wangac37e252015-02-11 18:10:36 +0100529 XFRM_LOOKUP_KEEP_DST_REF = 1 << 2,
Herbert Xu815f4e52007-12-12 10:36:59 -0800530};
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532struct flowi;
533#ifndef CONFIG_XFRM
David S. Miller452edd52011-03-02 13:27:41 -0800534static inline struct dst_entry *xfrm_lookup(struct net *net,
535 struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700536 const struct flowi *fl,
537 const struct sock *sk,
David S. Miller452edd52011-03-02 13:27:41 -0800538 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539{
David S. Miller452edd52011-03-02 13:27:41 -0800540 return dst_orig;
Steffen Klassertf92ee612014-09-16 10:08:40 +0200541}
542
543static inline struct dst_entry *xfrm_lookup_route(struct net *net,
544 struct dst_entry *dst_orig,
545 const struct flowi *fl,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700546 const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200547 int flags)
548{
549 return dst_orig;
550}
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400551
552static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
553{
554 return NULL;
555}
556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557#else
Joe Perchesa4023dd2013-09-20 11:23:21 -0700558struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700559 const struct flowi *fl, const struct sock *sk,
Joe Perchesa4023dd2013-09-20 11:23:21 -0700560 int flags);
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400561
Steffen Klassertf92ee612014-09-16 10:08:40 +0200562struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
Eric Dumazet6f9c9612015-09-25 07:39:10 -0700563 const struct flowi *fl, const struct sock *sk,
Steffen Klassertf92ee612014-09-16 10:08:40 +0200564 int flags);
565
Vlad Yaseviche87b3992013-10-15 22:01:29 -0400566/* skb attached with this dst needs transformation if dst->xfrm is valid */
567static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst)
568{
569 return dst->xfrm;
570}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573#endif /* _NET_DST_H */