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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | ||
86393e52 | 11 | #include <net/dst_ops.h> |
14c85021 | 12 | #include <linux/netdevice.h> |
1da177e4 LT |
13 | #include <linux/rtnetlink.h> |
14 | #include <linux/rcupdate.h> | |
187f1882 | 15 | #include <linux/bug.h> |
1da177e4 LT |
16 | #include <linux/jiffies.h> |
17 | #include <net/neighbour.h> | |
18 | #include <asm/processor.h> | |
19 | ||
1da177e4 LT |
20 | #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 | ||
31 | struct sk_buff; | |
32 | ||
fd2c3ef7 | 33 | struct dst_entry { |
66727145 | 34 | struct net_device *dev; |
1e19e02c | 35 | struct rcu_head rcu_head; |
1da177e4 | 36 | struct dst_entry *child; |
62fa8a84 DM |
37 | struct dst_ops *ops; |
38 | unsigned long _metrics; | |
ecd98837 | 39 | unsigned long expires; |
f1dd9c37 | 40 | struct dst_entry *path; |
ecd98837 | 41 | struct dst_entry *from; |
def8b4fa | 42 | #ifdef CONFIG_XFRM |
1da177e4 | 43 | struct xfrm_state *xfrm; |
5635c10d ED |
44 | #else |
45 | void *__pad1; | |
def8b4fa | 46 | #endif |
7f95e188 | 47 | int (*input)(struct sk_buff *); |
ede2059d | 48 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 49 | |
5110effe | 50 | unsigned short flags; |
f6b72b62 DM |
51 | #define DST_HOST 0x0001 |
52 | #define DST_NOXFRM 0x0002 | |
53 | #define DST_NOPOLICY 0x0004 | |
1eb04e7c WW |
54 | #define DST_NOCOUNT 0x0008 |
55 | #define DST_FAKE_RTABLE 0x0010 | |
56 | #define DST_XFRM_TUNNEL 0x0020 | |
57 | #define DST_XFRM_QUEUE 0x0040 | |
58 | #define DST_METADATA 0x0080 | |
f6b72b62 | 59 | |
62fa8a84 | 60 | short error; |
f5b0a874 DM |
61 | |
62 | /* A non-zero value of dst->obsolete forces by-hand validation | |
63 | * of the route entry. Positive values are set by the generic | |
64 | * dst layer to indicate that the entry has been forcefully | |
65 | * destroyed. | |
66 | * | |
67 | * Negative values are used by the implementation layer code to | |
68 | * force invocation of the dst_ops->check() method. | |
69 | */ | |
62fa8a84 | 70 | short obsolete; |
f5b0a874 DM |
71 | #define DST_OBSOLETE_NONE 0 |
72 | #define DST_OBSOLETE_DEAD 2 | |
73 | #define DST_OBSOLETE_FORCE_CHK -1 | |
ceb33206 | 74 | #define DST_OBSOLETE_KILL -2 |
62fa8a84 DM |
75 | unsigned short header_len; /* more space at head required */ |
76 | unsigned short trailer_len; /* space to reserve at tail */ | |
51ce8bd4 JA |
77 | unsigned short __pad3; |
78 | ||
c7066f70 | 79 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f1dd9c37 | 80 | __u32 tclassid; |
5635c10d ED |
81 | #else |
82 | __u32 __pad2; | |
f1dd9c37 ZY |
83 | #endif |
84 | ||
751a587a | 85 | #ifdef CONFIG_64BIT |
5635c10d ED |
86 | /* |
87 | * Align __refcnt to a 64 bytes alignment | |
88 | * (L1_CACHE_SIZE would be too much) | |
89 | */ | |
0868e253 | 90 | long __pad_to_align_refcnt[2]; |
5635c10d | 91 | #endif |
f1dd9c37 ZY |
92 | /* |
93 | * __refcnt wants to be on a different cache line from | |
94 | * input/output/ops or performance tanks badly | |
95 | */ | |
1e19e02c ED |
96 | atomic_t __refcnt; /* client references */ |
97 | int __use; | |
f1dd9c37 | 98 | unsigned long lastuse; |
751a587a | 99 | struct lwtunnel_state *lwtstate; |
1e19e02c | 100 | union { |
fc766e4c ED |
101 | struct dst_entry *next; |
102 | struct rtable __rcu *rt_next; | |
103 | struct rt6_info *rt6_next; | |
104 | struct dn_route __rcu *dn_next; | |
1e19e02c | 105 | }; |
1da177e4 LT |
106 | }; |
107 | ||
3fb07daf ED |
108 | struct dst_metrics { |
109 | u32 metrics[RTAX_MAX]; | |
110 | atomic_t refcnt; | |
111 | }; | |
112 | extern const struct dst_metrics dst_default_metrics; | |
113 | ||
a4023dd0 | 114 | u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old); |
62fa8a84 | 115 | |
e5fd387a | 116 | #define DST_METRICS_READ_ONLY 0x1UL |
3fb07daf | 117 | #define DST_METRICS_REFCOUNTED 0x2UL |
e5fd387a | 118 | #define DST_METRICS_FLAGS 0x3UL |
62fa8a84 | 119 | #define __DST_METRICS_PTR(Y) \ |
e5fd387a | 120 | ((u32 *)((Y) & ~DST_METRICS_FLAGS)) |
62fa8a84 DM |
121 | #define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics) |
122 | ||
123 | static inline bool dst_metrics_read_only(const struct dst_entry *dst) | |
124 | { | |
125 | return dst->_metrics & DST_METRICS_READ_ONLY; | |
126 | } | |
127 | ||
a4023dd0 | 128 | void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old); |
62fa8a84 DM |
129 | |
130 | static inline void dst_destroy_metrics_generic(struct dst_entry *dst) | |
131 | { | |
132 | unsigned long val = dst->_metrics; | |
133 | if (!(val & DST_METRICS_READ_ONLY)) | |
134 | __dst_destroy_metrics_generic(dst, val); | |
135 | } | |
136 | ||
137 | static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst) | |
138 | { | |
139 | unsigned long p = dst->_metrics; | |
140 | ||
1f37070d SH |
141 | BUG_ON(!p); |
142 | ||
62fa8a84 DM |
143 | if (p & DST_METRICS_READ_ONLY) |
144 | return dst->ops->cow_metrics(dst, p); | |
145 | return __DST_METRICS_PTR(p); | |
146 | } | |
147 | ||
148 | /* This may only be invoked before the entry has reached global | |
149 | * visibility. | |
150 | */ | |
151 | static inline void dst_init_metrics(struct dst_entry *dst, | |
152 | const u32 *src_metrics, | |
153 | bool read_only) | |
154 | { | |
155 | dst->_metrics = ((unsigned long) src_metrics) | | |
156 | (read_only ? DST_METRICS_READ_ONLY : 0); | |
157 | } | |
158 | ||
159 | static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src) | |
160 | { | |
161 | u32 *dst_metrics = dst_metrics_write_ptr(dest); | |
162 | ||
163 | if (dst_metrics) { | |
164 | u32 *src_metrics = DST_METRICS_PTR(src); | |
165 | ||
166 | memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32)); | |
167 | } | |
168 | } | |
169 | ||
170 | static inline u32 *dst_metrics_ptr(struct dst_entry *dst) | |
171 | { | |
172 | return DST_METRICS_PTR(dst); | |
173 | } | |
174 | ||
1da177e4 | 175 | static inline u32 |
5170ae82 | 176 | dst_metric_raw(const struct dst_entry *dst, const int metric) |
1da177e4 | 177 | { |
62fa8a84 DM |
178 | u32 *p = DST_METRICS_PTR(dst); |
179 | ||
180 | return p[metric-1]; | |
defb3519 DM |
181 | } |
182 | ||
5170ae82 DM |
183 | static inline u32 |
184 | dst_metric(const struct dst_entry *dst, const int metric) | |
185 | { | |
0dbaee3b | 186 | WARN_ON_ONCE(metric == RTAX_HOPLIMIT || |
d33e4553 DM |
187 | metric == RTAX_ADVMSS || |
188 | metric == RTAX_MTU); | |
5170ae82 DM |
189 | return dst_metric_raw(dst, metric); |
190 | } | |
191 | ||
0dbaee3b DM |
192 | static inline u32 |
193 | dst_metric_advmss(const struct dst_entry *dst) | |
194 | { | |
195 | u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
196 | ||
197 | if (!advmss) | |
198 | advmss = dst->ops->default_advmss(dst); | |
199 | ||
200 | return advmss; | |
201 | } | |
202 | ||
defb3519 DM |
203 | static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val) |
204 | { | |
62fa8a84 | 205 | u32 *p = dst_metrics_write_ptr(dst); |
defb3519 | 206 | |
62fa8a84 DM |
207 | if (p) |
208 | p[metric-1] = val; | |
1da177e4 LT |
209 | } |
210 | ||
c3a8d947 DB |
211 | /* Kernel-internal feature bits that are unallocated in user space. */ |
212 | #define DST_FEATURE_ECN_CA (1 << 31) | |
213 | ||
214 | #define DST_FEATURE_MASK (DST_FEATURE_ECN_CA) | |
215 | #define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN) | |
216 | ||
0c3adfb8 GBY |
217 | static inline u32 |
218 | dst_feature(const struct dst_entry *dst, u32 feature) | |
219 | { | |
bb5b7c11 | 220 | return dst_metric(dst, RTAX_FEATURES) & feature; |
0c3adfb8 GBY |
221 | } |
222 | ||
1da177e4 LT |
223 | static inline u32 dst_mtu(const struct dst_entry *dst) |
224 | { | |
618f9bc7 | 225 | return dst->ops->mtu(dst); |
1da177e4 LT |
226 | } |
227 | ||
c1e20f7c SH |
228 | /* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */ |
229 | static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric) | |
230 | { | |
231 | return msecs_to_jiffies(dst_metric(dst, metric)); | |
232 | } | |
233 | ||
1da177e4 LT |
234 | static inline u32 |
235 | dst_allfrag(const struct dst_entry *dst) | |
236 | { | |
0c3adfb8 | 237 | int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG); |
1da177e4 LT |
238 | return ret; |
239 | } | |
240 | ||
241 | static inline int | |
d33e4553 | 242 | dst_metric_locked(const struct dst_entry *dst, int metric) |
1da177e4 LT |
243 | { |
244 | return dst_metric(dst, RTAX_LOCK) & (1<<metric); | |
245 | } | |
246 | ||
7f95e188 | 247 | static inline void dst_hold(struct dst_entry *dst) |
1da177e4 | 248 | { |
5635c10d ED |
249 | /* |
250 | * If your kernel compilation stops here, please check | |
251 | * __pad_to_align_refcnt declaration in struct dst_entry | |
252 | */ | |
253 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63); | |
44ebe791 | 254 | WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0); |
1da177e4 LT |
255 | } |
256 | ||
03f49f34 PE |
257 | static inline void dst_use(struct dst_entry *dst, unsigned long time) |
258 | { | |
259 | dst_hold(dst); | |
260 | dst->__use++; | |
261 | dst->lastuse = time; | |
262 | } | |
263 | ||
7fee226a ED |
264 | static inline void dst_use_noref(struct dst_entry *dst, unsigned long time) |
265 | { | |
266 | dst->__use++; | |
267 | dst->lastuse = time; | |
268 | } | |
269 | ||
7f95e188 | 270 | static inline struct dst_entry *dst_clone(struct dst_entry *dst) |
1da177e4 LT |
271 | { |
272 | if (dst) | |
273 | atomic_inc(&dst->__refcnt); | |
274 | return dst; | |
275 | } | |
276 | ||
a4023dd0 | 277 | void dst_release(struct dst_entry *dst); |
7fee226a | 278 | |
5f56f409 WW |
279 | void dst_release_immediate(struct dst_entry *dst); |
280 | ||
7fee226a ED |
281 | static 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 | */ | |
adf30907 ED |
293 | static inline void skb_dst_drop(struct sk_buff *skb) |
294 | { | |
7fee226a ED |
295 | if (skb->_skb_refdst) { |
296 | refdst_drop(skb->_skb_refdst); | |
297 | skb->_skb_refdst = 0UL; | |
298 | } | |
299 | } | |
300 | ||
e79e2595 | 301 | static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst) |
7fee226a | 302 | { |
e79e2595 | 303 | nskb->_skb_refdst = refdst; |
7fee226a ED |
304 | if (!(nskb->_skb_refdst & SKB_DST_NOREF)) |
305 | dst_clone(skb_dst(nskb)); | |
306 | } | |
307 | ||
e79e2595 JS |
308 | static 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 | ||
7fee226a ED |
313 | /** |
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 | */ | |
319 | static 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 | } | |
adf30907 | 326 | } |
1da177e4 | 327 | |
5037e9ef ED |
328 | /** |
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 | */ | |
335 | static inline bool dst_hold_safe(struct dst_entry *dst) | |
336 | { | |
b2a9c0ed | 337 | return atomic_inc_not_zero(&dst->__refcnt); |
5037e9ef ED |
338 | } |
339 | ||
340 | /** | |
341 | * skb_dst_force_safe - makes sure skb dst is refcounted | |
342 | * @skb: buffer | |
343 | * | |
344 | * If dst is not yet refcounted and not destroyed, grab a ref on it. | |
345 | */ | |
346 | static inline void skb_dst_force_safe(struct sk_buff *skb) | |
347 | { | |
348 | if (skb_dst_is_noref(skb)) { | |
349 | struct dst_entry *dst = skb_dst(skb); | |
350 | ||
351 | if (!dst_hold_safe(dst)) | |
352 | dst = NULL; | |
353 | ||
354 | skb->_skb_refdst = (unsigned long)dst; | |
355 | } | |
356 | } | |
357 | ||
d19d56dd | 358 | |
290b895e ED |
359 | /** |
360 | * __skb_tunnel_rx - prepare skb for rx reinsert | |
361 | * @skb: buffer | |
362 | * @dev: tunnel device | |
ea23192e | 363 | * @net: netns for packet i/o |
290b895e ED |
364 | * |
365 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, | |
366 | * so make some cleanups. (no accounting done) | |
367 | */ | |
ea23192e ND |
368 | static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
369 | struct net *net) | |
290b895e ED |
370 | { |
371 | skb->dev = dev; | |
bdeab991 TH |
372 | |
373 | /* | |
7539fadc | 374 | * Clear hash so that we can recalulate the hash for the |
bdeab991 TH |
375 | * encapsulated packet, unless we have already determine the hash |
376 | * over the L4 4-tuple. | |
377 | */ | |
7539fadc | 378 | skb_clear_hash_if_not_l4(skb); |
290b895e | 379 | skb_set_queue_mapping(skb, 0); |
ea23192e | 380 | skb_scrub_packet(skb, !net_eq(net, dev_net(dev))); |
290b895e ED |
381 | } |
382 | ||
d19d56dd ED |
383 | /** |
384 | * skb_tunnel_rx - prepare skb for rx reinsert | |
385 | * @skb: buffer | |
386 | * @dev: tunnel device | |
387 | * | |
388 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, | |
389 | * so make some cleanups, and perform accounting. | |
290b895e | 390 | * Note: this accounting is not SMP safe. |
d19d56dd | 391 | */ |
ea23192e ND |
392 | static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
393 | struct net *net) | |
d19d56dd | 394 | { |
d19d56dd ED |
395 | /* TODO : stats should be SMP safe */ |
396 | dev->stats.rx_packets++; | |
397 | dev->stats.rx_bytes += skb->len; | |
ea23192e | 398 | __skb_tunnel_rx(skb, dev, net); |
d19d56dd ED |
399 | } |
400 | ||
808c1b69 DB |
401 | static inline u32 dst_tclassid(const struct sk_buff *skb) |
402 | { | |
403 | #ifdef CONFIG_IP_ROUTE_CLASSID | |
404 | const struct dst_entry *dst; | |
405 | ||
406 | dst = skb_dst(skb); | |
407 | if (dst) | |
408 | return dst->tclassid; | |
409 | #endif | |
410 | return 0; | |
411 | } | |
412 | ||
ede2059d | 413 | int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
aad88724 ED |
414 | static inline int dst_discard(struct sk_buff *skb) |
415 | { | |
ede2059d | 416 | return dst_discard_out(&init_net, skb->sk, skb); |
aad88724 | 417 | } |
a4023dd0 JP |
418 | void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref, |
419 | int initial_obsolete, unsigned short flags); | |
f38a9eb1 TG |
420 | void dst_init(struct dst_entry *dst, struct dst_ops *ops, |
421 | struct net_device *dev, int initial_ref, int initial_obsolete, | |
422 | unsigned short flags); | |
a4023dd0 | 423 | struct dst_entry *dst_destroy(struct dst_entry *dst); |
4a6ce2b6 | 424 | void dst_dev_put(struct dst_entry *dst); |
1da177e4 | 425 | |
1da177e4 LT |
426 | static inline void dst_confirm(struct dst_entry *dst) |
427 | { | |
5110effe | 428 | } |
f2c31e32 | 429 | |
d3aaeb38 DM |
430 | static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
431 | { | |
aaa0c23c ZZ |
432 | struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr); |
433 | return IS_ERR(n) ? NULL : n; | |
f894cbf8 DM |
434 | } |
435 | ||
436 | static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst, | |
437 | struct sk_buff *skb) | |
438 | { | |
aaa0c23c ZZ |
439 | struct neighbour *n = dst->ops->neigh_lookup(dst, skb, NULL); |
440 | return IS_ERR(n) ? NULL : n; | |
d3aaeb38 DM |
441 | } |
442 | ||
63fca65d JA |
443 | static inline void dst_confirm_neigh(const struct dst_entry *dst, |
444 | const void *daddr) | |
445 | { | |
446 | if (dst->ops->confirm_neigh) | |
447 | dst->ops->confirm_neigh(dst, daddr); | |
448 | } | |
449 | ||
1da177e4 LT |
450 | static inline void dst_link_failure(struct sk_buff *skb) |
451 | { | |
adf30907 | 452 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
453 | if (dst && dst->ops && dst->ops->link_failure) |
454 | dst->ops->link_failure(skb); | |
455 | } | |
456 | ||
457 | static inline void dst_set_expires(struct dst_entry *dst, int timeout) | |
458 | { | |
459 | unsigned long expires = jiffies + timeout; | |
460 | ||
461 | if (expires == 0) | |
462 | expires = 1; | |
463 | ||
464 | if (dst->expires == 0 || time_before(expires, dst->expires)) | |
465 | dst->expires = expires; | |
466 | } | |
467 | ||
468 | /* Output packet to network from transport. */ | |
13206b6b | 469 | static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
aad88724 | 470 | { |
ede2059d | 471 | return skb_dst(skb)->output(net, sk, skb); |
aad88724 | 472 | } |
1da177e4 LT |
473 | |
474 | /* Input packet from network to transport. */ | |
475 | static inline int dst_input(struct sk_buff *skb) | |
476 | { | |
adf30907 | 477 | return skb_dst(skb)->input(skb); |
1da177e4 LT |
478 | } |
479 | ||
480 | static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie) | |
481 | { | |
482 | if (dst->obsolete) | |
483 | dst = dst->ops->check(dst, cookie); | |
484 | return dst; | |
485 | } | |
486 | ||
815f4e57 HX |
487 | /* Flags for xfrm_lookup flags argument. */ |
488 | enum { | |
80c0bc9e | 489 | XFRM_LOOKUP_ICMP = 1 << 0, |
b8c203b2 | 490 | XFRM_LOOKUP_QUEUE = 1 << 1, |
ac37e251 | 491 | XFRM_LOOKUP_KEEP_DST_REF = 1 << 2, |
815f4e57 HX |
492 | }; |
493 | ||
1da177e4 LT |
494 | struct flowi; |
495 | #ifndef CONFIG_XFRM | |
452edd59 DM |
496 | static inline struct dst_entry *xfrm_lookup(struct net *net, |
497 | struct dst_entry *dst_orig, | |
6f9c9615 ED |
498 | const struct flowi *fl, |
499 | const struct sock *sk, | |
452edd59 | 500 | int flags) |
1da177e4 | 501 | { |
452edd59 | 502 | return dst_orig; |
f92ee619 SK |
503 | } |
504 | ||
505 | static inline struct dst_entry *xfrm_lookup_route(struct net *net, | |
506 | struct dst_entry *dst_orig, | |
507 | const struct flowi *fl, | |
6f9c9615 | 508 | const struct sock *sk, |
f92ee619 SK |
509 | int flags) |
510 | { | |
511 | return dst_orig; | |
512 | } | |
e87b3998 VY |
513 | |
514 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) | |
515 | { | |
516 | return NULL; | |
517 | } | |
518 | ||
1da177e4 | 519 | #else |
a4023dd0 | 520 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
6f9c9615 | 521 | const struct flowi *fl, const struct sock *sk, |
a4023dd0 | 522 | int flags); |
e87b3998 | 523 | |
f92ee619 | 524 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, |
6f9c9615 | 525 | const struct flowi *fl, const struct sock *sk, |
f92ee619 SK |
526 | int flags); |
527 | ||
e87b3998 VY |
528 | /* skb attached with this dst needs transformation if dst->xfrm is valid */ |
529 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) | |
530 | { | |
531 | return dst->xfrm; | |
532 | } | |
1da177e4 | 533 | #endif |
1da177e4 LT |
534 | |
535 | #endif /* _NET_DST_H */ |