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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
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 | ||
86393e52 | 12 | #include <net/dst_ops.h> |
14c85021 | 13 | #include <linux/netdevice.h> |
1da177e4 LT |
14 | #include <linux/rtnetlink.h> |
15 | #include <linux/rcupdate.h> | |
187f1882 | 16 | #include <linux/bug.h> |
1da177e4 | 17 | #include <linux/jiffies.h> |
9620fef2 | 18 | #include <linux/refcount.h> |
1da177e4 LT |
19 | #include <net/neighbour.h> |
20 | #include <asm/processor.h> | |
21 | ||
1da177e4 LT |
22 | #define DST_GC_MIN (HZ/10) |
23 | #define DST_GC_INC (HZ/2) | |
24 | #define DST_GC_MAX (120*HZ) | |
25 | ||
26 | /* Each dst_entry has reference count and sits in some parent list(s). | |
27 | * When it is removed from parent list, it is "freed" (dst_free). | |
28 | * After this it enters dead state (dst->obsolete > 0) and if its refcnt | |
29 | * is zero, it can be destroyed immediately, otherwise it is added | |
30 | * to gc list and garbage collector periodically checks the refcnt. | |
31 | */ | |
32 | ||
33 | struct sk_buff; | |
34 | ||
fd2c3ef7 | 35 | struct dst_entry { |
66727145 | 36 | struct net_device *dev; |
62fa8a84 DM |
37 | struct dst_ops *ops; |
38 | unsigned long _metrics; | |
ecd98837 | 39 | unsigned long expires; |
def8b4fa | 40 | #ifdef CONFIG_XFRM |
1da177e4 | 41 | struct xfrm_state *xfrm; |
5635c10d ED |
42 | #else |
43 | void *__pad1; | |
def8b4fa | 44 | #endif |
7f95e188 | 45 | int (*input)(struct sk_buff *); |
ede2059d | 46 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 47 | |
5110effe | 48 | unsigned short flags; |
f6b72b62 DM |
49 | #define DST_HOST 0x0001 |
50 | #define DST_NOXFRM 0x0002 | |
51 | #define DST_NOPOLICY 0x0004 | |
1eb04e7c WW |
52 | #define DST_NOCOUNT 0x0008 |
53 | #define DST_FAKE_RTABLE 0x0010 | |
54 | #define DST_XFRM_TUNNEL 0x0020 | |
55 | #define DST_XFRM_QUEUE 0x0040 | |
56 | #define DST_METADATA 0x0080 | |
f6b72b62 | 57 | |
f5b0a874 DM |
58 | /* A non-zero value of dst->obsolete forces by-hand validation |
59 | * of the route entry. Positive values are set by the generic | |
60 | * dst layer to indicate that the entry has been forcefully | |
61 | * destroyed. | |
62 | * | |
63 | * Negative values are used by the implementation layer code to | |
64 | * force invocation of the dst_ops->check() method. | |
65 | */ | |
62fa8a84 | 66 | short obsolete; |
f5b0a874 DM |
67 | #define DST_OBSOLETE_NONE 0 |
68 | #define DST_OBSOLETE_DEAD 2 | |
69 | #define DST_OBSOLETE_FORCE_CHK -1 | |
ceb33206 | 70 | #define DST_OBSOLETE_KILL -2 |
62fa8a84 DM |
71 | unsigned short header_len; /* more space at head required */ |
72 | unsigned short trailer_len; /* space to reserve at tail */ | |
51ce8bd4 | 73 | |
f1dd9c37 ZY |
74 | /* |
75 | * __refcnt wants to be on a different cache line from | |
76 | * input/output/ops or performance tanks badly | |
77 | */ | |
8b207e73 DM |
78 | #ifdef CONFIG_64BIT |
79 | atomic_t __refcnt; /* 64-bit offset 64 */ | |
80 | #endif | |
1e19e02c | 81 | int __use; |
f1dd9c37 | 82 | unsigned long lastuse; |
751a587a | 83 | struct lwtunnel_state *lwtstate; |
8b207e73 DM |
84 | struct rcu_head rcu_head; |
85 | short error; | |
86 | short __pad; | |
87 | __u32 tclassid; | |
88 | #ifndef CONFIG_64BIT | |
89 | atomic_t __refcnt; /* 32-bit offset 64 */ | |
90 | #endif | |
1da177e4 LT |
91 | }; |
92 | ||
3fb07daf ED |
93 | struct dst_metrics { |
94 | u32 metrics[RTAX_MAX]; | |
9620fef2 | 95 | refcount_t refcnt; |
3fb07daf ED |
96 | }; |
97 | extern const struct dst_metrics dst_default_metrics; | |
98 | ||
a4023dd0 | 99 | u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old); |
62fa8a84 | 100 | |
e5fd387a | 101 | #define DST_METRICS_READ_ONLY 0x1UL |
3fb07daf | 102 | #define DST_METRICS_REFCOUNTED 0x2UL |
e5fd387a | 103 | #define DST_METRICS_FLAGS 0x3UL |
62fa8a84 | 104 | #define __DST_METRICS_PTR(Y) \ |
e5fd387a | 105 | ((u32 *)((Y) & ~DST_METRICS_FLAGS)) |
62fa8a84 DM |
106 | #define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics) |
107 | ||
108 | static inline bool dst_metrics_read_only(const struct dst_entry *dst) | |
109 | { | |
110 | return dst->_metrics & DST_METRICS_READ_ONLY; | |
111 | } | |
112 | ||
a4023dd0 | 113 | void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old); |
62fa8a84 DM |
114 | |
115 | static inline void dst_destroy_metrics_generic(struct dst_entry *dst) | |
116 | { | |
117 | unsigned long val = dst->_metrics; | |
118 | if (!(val & DST_METRICS_READ_ONLY)) | |
119 | __dst_destroy_metrics_generic(dst, val); | |
120 | } | |
121 | ||
122 | static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst) | |
123 | { | |
124 | unsigned long p = dst->_metrics; | |
125 | ||
1f37070d SH |
126 | BUG_ON(!p); |
127 | ||
62fa8a84 DM |
128 | if (p & DST_METRICS_READ_ONLY) |
129 | return dst->ops->cow_metrics(dst, p); | |
130 | return __DST_METRICS_PTR(p); | |
131 | } | |
132 | ||
133 | /* This may only be invoked before the entry has reached global | |
134 | * visibility. | |
135 | */ | |
136 | static inline void dst_init_metrics(struct dst_entry *dst, | |
137 | const u32 *src_metrics, | |
138 | bool read_only) | |
139 | { | |
140 | dst->_metrics = ((unsigned long) src_metrics) | | |
141 | (read_only ? DST_METRICS_READ_ONLY : 0); | |
142 | } | |
143 | ||
144 | static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src) | |
145 | { | |
146 | u32 *dst_metrics = dst_metrics_write_ptr(dest); | |
147 | ||
148 | if (dst_metrics) { | |
149 | u32 *src_metrics = DST_METRICS_PTR(src); | |
150 | ||
151 | memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32)); | |
152 | } | |
153 | } | |
154 | ||
155 | static inline u32 *dst_metrics_ptr(struct dst_entry *dst) | |
156 | { | |
157 | return DST_METRICS_PTR(dst); | |
158 | } | |
159 | ||
1da177e4 | 160 | static inline u32 |
5170ae82 | 161 | dst_metric_raw(const struct dst_entry *dst, const int metric) |
1da177e4 | 162 | { |
62fa8a84 DM |
163 | u32 *p = DST_METRICS_PTR(dst); |
164 | ||
165 | return p[metric-1]; | |
defb3519 DM |
166 | } |
167 | ||
5170ae82 DM |
168 | static inline u32 |
169 | dst_metric(const struct dst_entry *dst, const int metric) | |
170 | { | |
0dbaee3b | 171 | WARN_ON_ONCE(metric == RTAX_HOPLIMIT || |
d33e4553 DM |
172 | metric == RTAX_ADVMSS || |
173 | metric == RTAX_MTU); | |
5170ae82 DM |
174 | return dst_metric_raw(dst, metric); |
175 | } | |
176 | ||
0dbaee3b DM |
177 | static inline u32 |
178 | dst_metric_advmss(const struct dst_entry *dst) | |
179 | { | |
180 | u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
181 | ||
182 | if (!advmss) | |
183 | advmss = dst->ops->default_advmss(dst); | |
184 | ||
185 | return advmss; | |
186 | } | |
187 | ||
defb3519 DM |
188 | static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val) |
189 | { | |
62fa8a84 | 190 | u32 *p = dst_metrics_write_ptr(dst); |
defb3519 | 191 | |
62fa8a84 DM |
192 | if (p) |
193 | p[metric-1] = val; | |
1da177e4 LT |
194 | } |
195 | ||
c3a8d947 DB |
196 | /* Kernel-internal feature bits that are unallocated in user space. */ |
197 | #define DST_FEATURE_ECN_CA (1 << 31) | |
198 | ||
199 | #define DST_FEATURE_MASK (DST_FEATURE_ECN_CA) | |
200 | #define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN) | |
201 | ||
0c3adfb8 GBY |
202 | static inline u32 |
203 | dst_feature(const struct dst_entry *dst, u32 feature) | |
204 | { | |
bb5b7c11 | 205 | return dst_metric(dst, RTAX_FEATURES) & feature; |
0c3adfb8 GBY |
206 | } |
207 | ||
1da177e4 LT |
208 | static inline u32 dst_mtu(const struct dst_entry *dst) |
209 | { | |
618f9bc7 | 210 | return dst->ops->mtu(dst); |
1da177e4 LT |
211 | } |
212 | ||
c1e20f7c SH |
213 | /* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */ |
214 | static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric) | |
215 | { | |
216 | return msecs_to_jiffies(dst_metric(dst, metric)); | |
217 | } | |
218 | ||
1da177e4 LT |
219 | static inline u32 |
220 | dst_allfrag(const struct dst_entry *dst) | |
221 | { | |
0c3adfb8 | 222 | int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG); |
1da177e4 LT |
223 | return ret; |
224 | } | |
225 | ||
226 | static inline int | |
d33e4553 | 227 | dst_metric_locked(const struct dst_entry *dst, int metric) |
1da177e4 LT |
228 | { |
229 | return dst_metric(dst, RTAX_LOCK) & (1<<metric); | |
230 | } | |
231 | ||
7f95e188 | 232 | static inline void dst_hold(struct dst_entry *dst) |
1da177e4 | 233 | { |
5635c10d ED |
234 | /* |
235 | * If your kernel compilation stops here, please check | |
8b207e73 | 236 | * the placement of __refcnt in struct dst_entry |
5635c10d ED |
237 | */ |
238 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63); | |
44ebe791 | 239 | WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0); |
1da177e4 LT |
240 | } |
241 | ||
0da4af00 | 242 | static inline void dst_use_noref(struct dst_entry *dst, unsigned long time) |
03f49f34 | 243 | { |
32d18ab1 | 244 | if (unlikely(time != dst->lastuse)) { |
0da4af00 WW |
245 | dst->__use++; |
246 | dst->lastuse = time; | |
247 | } | |
03f49f34 PE |
248 | } |
249 | ||
0da4af00 | 250 | static inline void dst_hold_and_use(struct dst_entry *dst, unsigned long time) |
7fee226a | 251 | { |
0da4af00 WW |
252 | dst_hold(dst); |
253 | dst_use_noref(dst, time); | |
7fee226a ED |
254 | } |
255 | ||
7f95e188 | 256 | static inline struct dst_entry *dst_clone(struct dst_entry *dst) |
1da177e4 LT |
257 | { |
258 | if (dst) | |
222d7dbd | 259 | dst_hold(dst); |
1da177e4 LT |
260 | return dst; |
261 | } | |
262 | ||
a4023dd0 | 263 | void dst_release(struct dst_entry *dst); |
7fee226a | 264 | |
5f56f409 WW |
265 | void dst_release_immediate(struct dst_entry *dst); |
266 | ||
7fee226a ED |
267 | static inline void refdst_drop(unsigned long refdst) |
268 | { | |
269 | if (!(refdst & SKB_DST_NOREF)) | |
270 | dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK)); | |
271 | } | |
272 | ||
273 | /** | |
274 | * skb_dst_drop - drops skb dst | |
275 | * @skb: buffer | |
276 | * | |
277 | * Drops dst reference count if a reference was taken. | |
278 | */ | |
adf30907 ED |
279 | static inline void skb_dst_drop(struct sk_buff *skb) |
280 | { | |
7fee226a ED |
281 | if (skb->_skb_refdst) { |
282 | refdst_drop(skb->_skb_refdst); | |
283 | skb->_skb_refdst = 0UL; | |
284 | } | |
285 | } | |
286 | ||
e79e2595 | 287 | static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst) |
7fee226a | 288 | { |
e79e2595 | 289 | nskb->_skb_refdst = refdst; |
7fee226a ED |
290 | if (!(nskb->_skb_refdst & SKB_DST_NOREF)) |
291 | dst_clone(skb_dst(nskb)); | |
292 | } | |
293 | ||
e79e2595 JS |
294 | static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb) |
295 | { | |
296 | __skb_dst_copy(nskb, oskb->_skb_refdst); | |
297 | } | |
298 | ||
5037e9ef ED |
299 | /** |
300 | * dst_hold_safe - Take a reference on a dst if possible | |
301 | * @dst: pointer to dst entry | |
302 | * | |
303 | * This helper returns false if it could not safely | |
304 | * take a reference on a dst. | |
305 | */ | |
306 | static inline bool dst_hold_safe(struct dst_entry *dst) | |
307 | { | |
b2a9c0ed | 308 | return atomic_inc_not_zero(&dst->__refcnt); |
5037e9ef ED |
309 | } |
310 | ||
311 | /** | |
222d7dbd | 312 | * skb_dst_force - makes sure skb dst is refcounted |
5037e9ef ED |
313 | * @skb: buffer |
314 | * | |
315 | * If dst is not yet refcounted and not destroyed, grab a ref on it. | |
316 | */ | |
222d7dbd | 317 | static inline void skb_dst_force(struct sk_buff *skb) |
5037e9ef ED |
318 | { |
319 | if (skb_dst_is_noref(skb)) { | |
320 | struct dst_entry *dst = skb_dst(skb); | |
321 | ||
222d7dbd | 322 | WARN_ON(!rcu_read_lock_held()); |
5037e9ef ED |
323 | if (!dst_hold_safe(dst)) |
324 | dst = NULL; | |
325 | ||
326 | skb->_skb_refdst = (unsigned long)dst; | |
327 | } | |
328 | } | |
329 | ||
d19d56dd | 330 | |
290b895e ED |
331 | /** |
332 | * __skb_tunnel_rx - prepare skb for rx reinsert | |
333 | * @skb: buffer | |
334 | * @dev: tunnel device | |
ea23192e | 335 | * @net: netns for packet i/o |
290b895e ED |
336 | * |
337 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, | |
338 | * so make some cleanups. (no accounting done) | |
339 | */ | |
ea23192e ND |
340 | static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
341 | struct net *net) | |
290b895e ED |
342 | { |
343 | skb->dev = dev; | |
bdeab991 TH |
344 | |
345 | /* | |
7539fadc | 346 | * Clear hash so that we can recalulate the hash for the |
bdeab991 TH |
347 | * encapsulated packet, unless we have already determine the hash |
348 | * over the L4 4-tuple. | |
349 | */ | |
7539fadc | 350 | skb_clear_hash_if_not_l4(skb); |
290b895e | 351 | skb_set_queue_mapping(skb, 0); |
ea23192e | 352 | skb_scrub_packet(skb, !net_eq(net, dev_net(dev))); |
290b895e ED |
353 | } |
354 | ||
d19d56dd ED |
355 | /** |
356 | * skb_tunnel_rx - prepare skb for rx reinsert | |
357 | * @skb: buffer | |
358 | * @dev: tunnel device | |
8eb1a859 | 359 | * @net: netns for packet i/o |
d19d56dd ED |
360 | * |
361 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, | |
362 | * so make some cleanups, and perform accounting. | |
290b895e | 363 | * Note: this accounting is not SMP safe. |
d19d56dd | 364 | */ |
ea23192e ND |
365 | static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
366 | struct net *net) | |
d19d56dd | 367 | { |
d19d56dd ED |
368 | /* TODO : stats should be SMP safe */ |
369 | dev->stats.rx_packets++; | |
370 | dev->stats.rx_bytes += skb->len; | |
ea23192e | 371 | __skb_tunnel_rx(skb, dev, net); |
d19d56dd ED |
372 | } |
373 | ||
808c1b69 DB |
374 | static inline u32 dst_tclassid(const struct sk_buff *skb) |
375 | { | |
376 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
377 | const struct dst_entry *dst; | |
378 | ||
379 | dst = skb_dst(skb); | |
380 | if (dst) | |
381 | return dst->tclassid; | |
382 | #endif | |
383 | return 0; | |
384 | } | |
385 | ||
ede2059d | 386 | int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 ED |
387 | static inline int dst_discard(struct sk_buff *skb) |
388 | { | |
ede2059d | 389 | return dst_discard_out(&init_net, skb->sk, skb); |
aad88724 | 390 | } |
a4023dd0 JP |
391 | void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref, |
392 | int initial_obsolete, unsigned short flags); | |
f38a9eb1 TG |
393 | void dst_init(struct dst_entry *dst, struct dst_ops *ops, |
394 | struct net_device *dev, int initial_ref, int initial_obsolete, | |
395 | unsigned short flags); | |
a4023dd0 | 396 | struct dst_entry *dst_destroy(struct dst_entry *dst); |
4a6ce2b6 | 397 | void dst_dev_put(struct dst_entry *dst); |
1da177e4 | 398 | |
1da177e4 LT |
399 | static inline void dst_confirm(struct dst_entry *dst) |
400 | { | |
5110effe | 401 | } |
f2c31e32 | 402 | |
d3aaeb38 DM |
403 | static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
404 | { | |
aaa0c23c ZZ |
405 | struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr); |
406 | return IS_ERR(n) ? NULL : n; | |
f894cbf8 DM |
407 | } |
408 | ||
409 | static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst, | |
410 | struct sk_buff *skb) | |
411 | { | |
aaa0c23c ZZ |
412 | struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL); |
413 | return IS_ERR(n) ? NULL : n; | |
d3aaeb38 DM |
414 | } |
415 | ||
63fca65d JA |
416 | static inline void dst_confirm_neigh(const struct dst_entry *dst, |
417 | const void *daddr) | |
418 | { | |
419 | if (dst->ops->confirm_neigh) | |
420 | dst->ops->confirm_neigh(dst, daddr); | |
421 | } | |
422 | ||
1da177e4 LT |
423 | static inline void dst_link_failure(struct sk_buff *skb) |
424 | { | |
adf30907 | 425 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
426 | if (dst && dst->ops && dst->ops->link_failure) |
427 | dst->ops->link_failure(skb); | |
428 | } | |
429 | ||
430 | static inline void dst_set_expires(struct dst_entry *dst, int timeout) | |
431 | { | |
432 | unsigned long expires = jiffies + timeout; | |
433 | ||
434 | if (expires == 0) | |
435 | expires = 1; | |
436 | ||
437 | if (dst->expires == 0 || time_before(expires, dst->expires)) | |
438 | dst->expires = expires; | |
439 | } | |
440 | ||
441 | /* Output packet to network from transport. */ | |
13206b6b | 442 | static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
aad88724 | 443 | { |
ede2059d | 444 | return skb_dst(skb)->output(net, sk, skb); |
aad88724 | 445 | } |
1da177e4 LT |
446 | |
447 | /* Input packet from network to transport. */ | |
448 | static inline int dst_input(struct sk_buff *skb) | |
449 | { | |
adf30907 | 450 | return skb_dst(skb)->input(skb); |
1da177e4 LT |
451 | } |
452 | ||
453 | static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie) | |
454 | { | |
455 | if (dst->obsolete) | |
456 | dst = dst->ops->check(dst, cookie); | |
457 | return dst; | |
458 | } | |
459 | ||
815f4e57 HX |
460 | /* Flags for xfrm_lookup flags argument. */ |
461 | enum { | |
80c0bc9e | 462 | XFRM_LOOKUP_ICMP = 1 << 0, |
b8c203b2 | 463 | XFRM_LOOKUP_QUEUE = 1 << 1, |
ac37e251 | 464 | XFRM_LOOKUP_KEEP_DST_REF = 1 << 2, |
815f4e57 HX |
465 | }; |
466 | ||
1da177e4 LT |
467 | struct flowi; |
468 | #ifndef CONFIG_XFRM | |
452edd59 DM |
469 | static inline struct dst_entry *xfrm_lookup(struct net *net, |
470 | struct dst_entry *dst_orig, | |
6f9c9615 ED |
471 | const struct flowi *fl, |
472 | const struct sock *sk, | |
452edd59 | 473 | int flags) |
1da177e4 | 474 | { |
452edd59 | 475 | return dst_orig; |
f92ee619 SK |
476 | } |
477 | ||
bc56b334 BW |
478 | static inline struct dst_entry * |
479 | xfrm_lookup_with_ifid(struct net *net, struct dst_entry *dst_orig, | |
480 | const struct flowi *fl, const struct sock *sk, | |
481 | int flags, u32 if_id) | |
482 | { | |
483 | return dst_orig; | |
484 | } | |
485 | ||
f92ee619 SK |
486 | static inline struct dst_entry *xfrm_lookup_route(struct net *net, |
487 | struct dst_entry *dst_orig, | |
488 | const struct flowi *fl, | |
6f9c9615 | 489 | const struct sock *sk, |
f92ee619 SK |
490 | int flags) |
491 | { | |
492 | return dst_orig; | |
493 | } | |
e87b3998 VY |
494 | |
495 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) | |
496 | { | |
497 | return NULL; | |
498 | } | |
499 | ||
1da177e4 | 500 | #else |
a4023dd0 | 501 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
6f9c9615 | 502 | const struct flowi *fl, const struct sock *sk, |
a4023dd0 | 503 | int flags); |
e87b3998 | 504 | |
bc56b334 BW |
505 | struct dst_entry *xfrm_lookup_with_ifid(struct net *net, |
506 | struct dst_entry *dst_orig, | |
507 | const struct flowi *fl, | |
508 | const struct sock *sk, int flags, | |
509 | u32 if_id); | |
510 | ||
f92ee619 | 511 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, |
6f9c9615 | 512 | const struct flowi *fl, const struct sock *sk, |
f92ee619 SK |
513 | int flags); |
514 | ||
e87b3998 VY |
515 | /* skb attached with this dst needs transformation if dst->xfrm is valid */ |
516 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) | |
517 | { | |
518 | return dst->xfrm; | |
519 | } | |
1da177e4 | 520 | #endif |
1da177e4 | 521 | |
f15ca723 ND |
522 | static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu) |
523 | { | |
524 | struct dst_entry *dst = skb_dst(skb); | |
525 | ||
526 | if (dst && dst->ops->update_pmtu) | |
527 | dst->ops->update_pmtu(dst, NULL, skb, mtu); | |
528 | } | |
529 | ||
6b4f92af SB |
530 | static inline void skb_tunnel_check_pmtu(struct sk_buff *skb, |
531 | struct dst_entry *encap_dst, | |
532 | int headroom) | |
533 | { | |
534 | u32 encap_mtu = dst_mtu(encap_dst); | |
535 | ||
536 | if (skb->len > encap_mtu - headroom) | |
537 | skb_dst_update_pmtu(skb, encap_mtu - headroom); | |
538 | } | |
539 | ||
1da177e4 | 540 | #endif /* _NET_DST_H */ |