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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm_policy.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <asm/bug.h> | |
17 | #include <linux/config.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/kmod.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/workqueue.h> | |
23 | #include <linux/notifier.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/module.h> | |
26 | #include <net/xfrm.h> | |
27 | #include <net/ip.h> | |
28 | ||
29 | DECLARE_MUTEX(xfrm_cfg_sem); | |
30 | EXPORT_SYMBOL(xfrm_cfg_sem); | |
31 | ||
32 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
33 | ||
34 | struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
35 | EXPORT_SYMBOL(xfrm_policy_list); | |
36 | ||
37 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
38 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
39 | ||
ba89966c | 40 | static kmem_cache_t *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
41 | |
42 | static struct work_struct xfrm_policy_gc_work; | |
43 | static struct list_head xfrm_policy_gc_list = | |
44 | LIST_HEAD_INIT(xfrm_policy_gc_list); | |
45 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); | |
46 | ||
47 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
48 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
49 | ||
50 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) | |
51 | { | |
52 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
53 | struct xfrm_type_map *typemap; | |
54 | int err = 0; | |
55 | ||
56 | if (unlikely(afinfo == NULL)) | |
57 | return -EAFNOSUPPORT; | |
58 | typemap = afinfo->type_map; | |
59 | ||
60 | write_lock(&typemap->lock); | |
61 | if (likely(typemap->map[type->proto] == NULL)) | |
62 | typemap->map[type->proto] = type; | |
63 | else | |
64 | err = -EEXIST; | |
65 | write_unlock(&typemap->lock); | |
66 | xfrm_policy_put_afinfo(afinfo); | |
67 | return err; | |
68 | } | |
69 | EXPORT_SYMBOL(xfrm_register_type); | |
70 | ||
71 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
72 | { | |
73 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
74 | struct xfrm_type_map *typemap; | |
75 | int err = 0; | |
76 | ||
77 | if (unlikely(afinfo == NULL)) | |
78 | return -EAFNOSUPPORT; | |
79 | typemap = afinfo->type_map; | |
80 | ||
81 | write_lock(&typemap->lock); | |
82 | if (unlikely(typemap->map[type->proto] != type)) | |
83 | err = -ENOENT; | |
84 | else | |
85 | typemap->map[type->proto] = NULL; | |
86 | write_unlock(&typemap->lock); | |
87 | xfrm_policy_put_afinfo(afinfo); | |
88 | return err; | |
89 | } | |
90 | EXPORT_SYMBOL(xfrm_unregister_type); | |
91 | ||
92 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
93 | { | |
94 | struct xfrm_policy_afinfo *afinfo; | |
95 | struct xfrm_type_map *typemap; | |
96 | struct xfrm_type *type; | |
97 | int modload_attempted = 0; | |
98 | ||
99 | retry: | |
100 | afinfo = xfrm_policy_get_afinfo(family); | |
101 | if (unlikely(afinfo == NULL)) | |
102 | return NULL; | |
103 | typemap = afinfo->type_map; | |
104 | ||
105 | read_lock(&typemap->lock); | |
106 | type = typemap->map[proto]; | |
107 | if (unlikely(type && !try_module_get(type->owner))) | |
108 | type = NULL; | |
109 | read_unlock(&typemap->lock); | |
110 | if (!type && !modload_attempted) { | |
111 | xfrm_policy_put_afinfo(afinfo); | |
112 | request_module("xfrm-type-%d-%d", | |
113 | (int) family, (int) proto); | |
114 | modload_attempted = 1; | |
115 | goto retry; | |
116 | } | |
117 | ||
118 | xfrm_policy_put_afinfo(afinfo); | |
119 | return type; | |
120 | } | |
1da177e4 LT |
121 | |
122 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, | |
123 | unsigned short family) | |
124 | { | |
125 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
126 | int err = 0; | |
127 | ||
128 | if (unlikely(afinfo == NULL)) | |
129 | return -EAFNOSUPPORT; | |
130 | ||
131 | if (likely(afinfo->dst_lookup != NULL)) | |
132 | err = afinfo->dst_lookup(dst, fl); | |
133 | else | |
134 | err = -EINVAL; | |
135 | xfrm_policy_put_afinfo(afinfo); | |
136 | return err; | |
137 | } | |
138 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
139 | ||
140 | void xfrm_put_type(struct xfrm_type *type) | |
141 | { | |
142 | module_put(type->owner); | |
143 | } | |
144 | ||
145 | static inline unsigned long make_jiffies(long secs) | |
146 | { | |
147 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
148 | return MAX_SCHEDULE_TIMEOUT-1; | |
149 | else | |
150 | return secs*HZ; | |
151 | } | |
152 | ||
153 | static void xfrm_policy_timer(unsigned long data) | |
154 | { | |
155 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
156 | unsigned long now = (unsigned long)xtime.tv_sec; | |
157 | long next = LONG_MAX; | |
158 | int warn = 0; | |
159 | int dir; | |
160 | ||
161 | read_lock(&xp->lock); | |
162 | ||
163 | if (xp->dead) | |
164 | goto out; | |
165 | ||
77d8d7a6 | 166 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
167 | |
168 | if (xp->lft.hard_add_expires_seconds) { | |
169 | long tmo = xp->lft.hard_add_expires_seconds + | |
170 | xp->curlft.add_time - now; | |
171 | if (tmo <= 0) | |
172 | goto expired; | |
173 | if (tmo < next) | |
174 | next = tmo; | |
175 | } | |
176 | if (xp->lft.hard_use_expires_seconds) { | |
177 | long tmo = xp->lft.hard_use_expires_seconds + | |
178 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
179 | if (tmo <= 0) | |
180 | goto expired; | |
181 | if (tmo < next) | |
182 | next = tmo; | |
183 | } | |
184 | if (xp->lft.soft_add_expires_seconds) { | |
185 | long tmo = xp->lft.soft_add_expires_seconds + | |
186 | xp->curlft.add_time - now; | |
187 | if (tmo <= 0) { | |
188 | warn = 1; | |
189 | tmo = XFRM_KM_TIMEOUT; | |
190 | } | |
191 | if (tmo < next) | |
192 | next = tmo; | |
193 | } | |
194 | if (xp->lft.soft_use_expires_seconds) { | |
195 | long tmo = xp->lft.soft_use_expires_seconds + | |
196 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
197 | if (tmo <= 0) { | |
198 | warn = 1; | |
199 | tmo = XFRM_KM_TIMEOUT; | |
200 | } | |
201 | if (tmo < next) | |
202 | next = tmo; | |
203 | } | |
204 | ||
205 | if (warn) | |
206 | km_policy_expired(xp, dir, 0); | |
207 | if (next != LONG_MAX && | |
208 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
209 | xfrm_pol_hold(xp); | |
210 | ||
211 | out: | |
212 | read_unlock(&xp->lock); | |
213 | xfrm_pol_put(xp); | |
214 | return; | |
215 | ||
216 | expired: | |
217 | read_unlock(&xp->lock); | |
4666faab HX |
218 | if (!xfrm_policy_delete(xp, dir)) |
219 | km_policy_expired(xp, dir, 1); | |
1da177e4 LT |
220 | xfrm_pol_put(xp); |
221 | } | |
222 | ||
223 | ||
224 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
225 | * SPD calls. | |
226 | */ | |
227 | ||
dd0fc66f | 228 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
229 | { |
230 | struct xfrm_policy *policy; | |
231 | ||
232 | policy = kmalloc(sizeof(struct xfrm_policy), gfp); | |
233 | ||
234 | if (policy) { | |
235 | memset(policy, 0, sizeof(struct xfrm_policy)); | |
236 | atomic_set(&policy->refcnt, 1); | |
237 | rwlock_init(&policy->lock); | |
238 | init_timer(&policy->timer); | |
239 | policy->timer.data = (unsigned long)policy; | |
240 | policy->timer.function = xfrm_policy_timer; | |
241 | } | |
242 | return policy; | |
243 | } | |
244 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
245 | ||
246 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
247 | ||
248 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
249 | { | |
250 | if (!policy->dead) | |
251 | BUG(); | |
252 | ||
253 | if (policy->bundles) | |
254 | BUG(); | |
255 | ||
256 | if (del_timer(&policy->timer)) | |
257 | BUG(); | |
258 | ||
259 | kfree(policy); | |
260 | } | |
261 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
262 | ||
263 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
264 | { | |
265 | struct dst_entry *dst; | |
266 | ||
267 | while ((dst = policy->bundles) != NULL) { | |
268 | policy->bundles = dst->next; | |
269 | dst_free(dst); | |
270 | } | |
271 | ||
272 | if (del_timer(&policy->timer)) | |
273 | atomic_dec(&policy->refcnt); | |
274 | ||
275 | if (atomic_read(&policy->refcnt) > 1) | |
276 | flow_cache_flush(); | |
277 | ||
278 | xfrm_pol_put(policy); | |
279 | } | |
280 | ||
281 | static void xfrm_policy_gc_task(void *data) | |
282 | { | |
283 | struct xfrm_policy *policy; | |
284 | struct list_head *entry, *tmp; | |
285 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); | |
286 | ||
287 | spin_lock_bh(&xfrm_policy_gc_lock); | |
288 | list_splice_init(&xfrm_policy_gc_list, &gc_list); | |
289 | spin_unlock_bh(&xfrm_policy_gc_lock); | |
290 | ||
291 | list_for_each_safe(entry, tmp, &gc_list) { | |
292 | policy = list_entry(entry, struct xfrm_policy, list); | |
293 | xfrm_policy_gc_kill(policy); | |
294 | } | |
295 | } | |
296 | ||
297 | /* Rule must be locked. Release descentant resources, announce | |
298 | * entry dead. The rule must be unlinked from lists to the moment. | |
299 | */ | |
300 | ||
301 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
302 | { | |
303 | int dead; | |
304 | ||
305 | write_lock_bh(&policy->lock); | |
306 | dead = policy->dead; | |
307 | policy->dead = 1; | |
308 | write_unlock_bh(&policy->lock); | |
309 | ||
310 | if (unlikely(dead)) { | |
311 | WARN_ON(1); | |
312 | return; | |
313 | } | |
314 | ||
315 | spin_lock(&xfrm_policy_gc_lock); | |
316 | list_add(&policy->list, &xfrm_policy_gc_list); | |
317 | spin_unlock(&xfrm_policy_gc_lock); | |
318 | ||
319 | schedule_work(&xfrm_policy_gc_work); | |
320 | } | |
321 | ||
322 | /* Generate new index... KAME seems to generate them ordered by cost | |
323 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
324 | static u32 xfrm_gen_index(int dir) | |
325 | { | |
326 | u32 idx; | |
327 | struct xfrm_policy *p; | |
328 | static u32 idx_generator; | |
329 | ||
330 | for (;;) { | |
331 | idx = (idx_generator | dir); | |
332 | idx_generator += 8; | |
333 | if (idx == 0) | |
334 | idx = 8; | |
335 | for (p = xfrm_policy_list[dir]; p; p = p->next) { | |
336 | if (p->index == idx) | |
337 | break; | |
338 | } | |
339 | if (!p) | |
340 | return idx; | |
341 | } | |
342 | } | |
343 | ||
344 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) | |
345 | { | |
346 | struct xfrm_policy *pol, **p; | |
347 | struct xfrm_policy *delpol = NULL; | |
348 | struct xfrm_policy **newpos = NULL; | |
9b78a82c | 349 | struct dst_entry *gc_list; |
1da177e4 LT |
350 | |
351 | write_lock_bh(&xfrm_policy_lock); | |
352 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) { | |
353 | if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0) { | |
354 | if (excl) { | |
355 | write_unlock_bh(&xfrm_policy_lock); | |
356 | return -EEXIST; | |
357 | } | |
358 | *p = pol->next; | |
359 | delpol = pol; | |
360 | if (policy->priority > pol->priority) | |
361 | continue; | |
362 | } else if (policy->priority >= pol->priority) { | |
363 | p = &pol->next; | |
364 | continue; | |
365 | } | |
366 | if (!newpos) | |
367 | newpos = p; | |
368 | if (delpol) | |
369 | break; | |
370 | p = &pol->next; | |
371 | } | |
372 | if (newpos) | |
373 | p = newpos; | |
374 | xfrm_pol_hold(policy); | |
375 | policy->next = *p; | |
376 | *p = policy; | |
377 | atomic_inc(&flow_cache_genid); | |
378 | policy->index = delpol ? delpol->index : xfrm_gen_index(dir); | |
379 | policy->curlft.add_time = (unsigned long)xtime.tv_sec; | |
380 | policy->curlft.use_time = 0; | |
381 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
382 | xfrm_pol_hold(policy); | |
383 | write_unlock_bh(&xfrm_policy_lock); | |
384 | ||
9b78a82c | 385 | if (delpol) |
1da177e4 | 386 | xfrm_policy_kill(delpol); |
9b78a82c DM |
387 | |
388 | read_lock_bh(&xfrm_policy_lock); | |
389 | gc_list = NULL; | |
390 | for (policy = policy->next; policy; policy = policy->next) { | |
391 | struct dst_entry *dst; | |
392 | ||
393 | write_lock(&policy->lock); | |
394 | dst = policy->bundles; | |
395 | if (dst) { | |
396 | struct dst_entry *tail = dst; | |
397 | while (tail->next) | |
398 | tail = tail->next; | |
399 | tail->next = gc_list; | |
400 | gc_list = dst; | |
401 | ||
402 | policy->bundles = NULL; | |
403 | } | |
404 | write_unlock(&policy->lock); | |
1da177e4 | 405 | } |
9b78a82c DM |
406 | read_unlock_bh(&xfrm_policy_lock); |
407 | ||
408 | while (gc_list) { | |
409 | struct dst_entry *dst = gc_list; | |
410 | ||
411 | gc_list = dst->next; | |
412 | dst_free(dst); | |
413 | } | |
414 | ||
1da177e4 LT |
415 | return 0; |
416 | } | |
417 | EXPORT_SYMBOL(xfrm_policy_insert); | |
418 | ||
419 | struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel, | |
420 | int delete) | |
421 | { | |
422 | struct xfrm_policy *pol, **p; | |
423 | ||
424 | write_lock_bh(&xfrm_policy_lock); | |
425 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) { | |
426 | if (memcmp(sel, &pol->selector, sizeof(*sel)) == 0) { | |
427 | xfrm_pol_hold(pol); | |
428 | if (delete) | |
429 | *p = pol->next; | |
430 | break; | |
431 | } | |
432 | } | |
433 | write_unlock_bh(&xfrm_policy_lock); | |
434 | ||
435 | if (pol && delete) { | |
436 | atomic_inc(&flow_cache_genid); | |
437 | xfrm_policy_kill(pol); | |
438 | } | |
439 | return pol; | |
440 | } | |
441 | EXPORT_SYMBOL(xfrm_policy_bysel); | |
442 | ||
443 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete) | |
444 | { | |
445 | struct xfrm_policy *pol, **p; | |
446 | ||
447 | write_lock_bh(&xfrm_policy_lock); | |
77d8d7a6 | 448 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) { |
1da177e4 LT |
449 | if (pol->index == id) { |
450 | xfrm_pol_hold(pol); | |
451 | if (delete) | |
452 | *p = pol->next; | |
453 | break; | |
454 | } | |
455 | } | |
456 | write_unlock_bh(&xfrm_policy_lock); | |
457 | ||
458 | if (pol && delete) { | |
459 | atomic_inc(&flow_cache_genid); | |
460 | xfrm_policy_kill(pol); | |
461 | } | |
462 | return pol; | |
463 | } | |
464 | EXPORT_SYMBOL(xfrm_policy_byid); | |
465 | ||
466 | void xfrm_policy_flush(void) | |
467 | { | |
468 | struct xfrm_policy *xp; | |
469 | int dir; | |
470 | ||
471 | write_lock_bh(&xfrm_policy_lock); | |
472 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
473 | while ((xp = xfrm_policy_list[dir]) != NULL) { | |
474 | xfrm_policy_list[dir] = xp->next; | |
475 | write_unlock_bh(&xfrm_policy_lock); | |
476 | ||
477 | xfrm_policy_kill(xp); | |
478 | ||
479 | write_lock_bh(&xfrm_policy_lock); | |
480 | } | |
481 | } | |
482 | atomic_inc(&flow_cache_genid); | |
483 | write_unlock_bh(&xfrm_policy_lock); | |
484 | } | |
485 | EXPORT_SYMBOL(xfrm_policy_flush); | |
486 | ||
487 | int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), | |
488 | void *data) | |
489 | { | |
490 | struct xfrm_policy *xp; | |
491 | int dir; | |
492 | int count = 0; | |
493 | int error = 0; | |
494 | ||
495 | read_lock_bh(&xfrm_policy_lock); | |
496 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
497 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) | |
498 | count++; | |
499 | } | |
500 | ||
501 | if (count == 0) { | |
502 | error = -ENOENT; | |
503 | goto out; | |
504 | } | |
505 | ||
506 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
507 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) { | |
508 | error = func(xp, dir%XFRM_POLICY_MAX, --count, data); | |
509 | if (error) | |
510 | goto out; | |
511 | } | |
512 | } | |
513 | ||
514 | out: | |
515 | read_unlock_bh(&xfrm_policy_lock); | |
516 | return error; | |
517 | } | |
518 | EXPORT_SYMBOL(xfrm_policy_walk); | |
519 | ||
520 | /* Find policy to apply to this flow. */ | |
521 | ||
522 | static void xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, | |
523 | void **objp, atomic_t **obj_refp) | |
524 | { | |
525 | struct xfrm_policy *pol; | |
526 | ||
527 | read_lock_bh(&xfrm_policy_lock); | |
528 | for (pol = xfrm_policy_list[dir]; pol; pol = pol->next) { | |
529 | struct xfrm_selector *sel = &pol->selector; | |
530 | int match; | |
531 | ||
532 | if (pol->family != family) | |
533 | continue; | |
534 | ||
535 | match = xfrm_selector_match(sel, fl, family); | |
536 | if (match) { | |
537 | xfrm_pol_hold(pol); | |
538 | break; | |
539 | } | |
540 | } | |
541 | read_unlock_bh(&xfrm_policy_lock); | |
542 | if ((*objp = (void *) pol) != NULL) | |
543 | *obj_refp = &pol->refcnt; | |
544 | } | |
545 | ||
546 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) | |
547 | { | |
548 | struct xfrm_policy *pol; | |
549 | ||
550 | read_lock_bh(&xfrm_policy_lock); | |
551 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
552 | int match = xfrm_selector_match(&pol->selector, fl, | |
553 | sk->sk_family); | |
554 | if (match) | |
555 | xfrm_pol_hold(pol); | |
556 | else | |
557 | pol = NULL; | |
558 | } | |
559 | read_unlock_bh(&xfrm_policy_lock); | |
560 | return pol; | |
561 | } | |
562 | ||
563 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
564 | { | |
565 | pol->next = xfrm_policy_list[dir]; | |
566 | xfrm_policy_list[dir] = pol; | |
567 | xfrm_pol_hold(pol); | |
568 | } | |
569 | ||
570 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
571 | int dir) | |
572 | { | |
573 | struct xfrm_policy **polp; | |
574 | ||
575 | for (polp = &xfrm_policy_list[dir]; | |
576 | *polp != NULL; polp = &(*polp)->next) { | |
577 | if (*polp == pol) { | |
578 | *polp = pol->next; | |
579 | return pol; | |
580 | } | |
581 | } | |
582 | return NULL; | |
583 | } | |
584 | ||
4666faab | 585 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
586 | { |
587 | write_lock_bh(&xfrm_policy_lock); | |
588 | pol = __xfrm_policy_unlink(pol, dir); | |
589 | write_unlock_bh(&xfrm_policy_lock); | |
590 | if (pol) { | |
591 | if (dir < XFRM_POLICY_MAX) | |
592 | atomic_inc(&flow_cache_genid); | |
593 | xfrm_policy_kill(pol); | |
4666faab | 594 | return 0; |
1da177e4 | 595 | } |
4666faab | 596 | return -ENOENT; |
1da177e4 LT |
597 | } |
598 | ||
599 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
600 | { | |
601 | struct xfrm_policy *old_pol; | |
602 | ||
603 | write_lock_bh(&xfrm_policy_lock); | |
604 | old_pol = sk->sk_policy[dir]; | |
605 | sk->sk_policy[dir] = pol; | |
606 | if (pol) { | |
607 | pol->curlft.add_time = (unsigned long)xtime.tv_sec; | |
608 | pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir); | |
609 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); | |
610 | } | |
611 | if (old_pol) | |
612 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
613 | write_unlock_bh(&xfrm_policy_lock); | |
614 | ||
615 | if (old_pol) { | |
616 | xfrm_policy_kill(old_pol); | |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
622 | { | |
623 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
624 | ||
625 | if (newp) { | |
626 | newp->selector = old->selector; | |
627 | newp->lft = old->lft; | |
628 | newp->curlft = old->curlft; | |
629 | newp->action = old->action; | |
630 | newp->flags = old->flags; | |
631 | newp->xfrm_nr = old->xfrm_nr; | |
632 | newp->index = old->index; | |
633 | memcpy(newp->xfrm_vec, old->xfrm_vec, | |
634 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
635 | write_lock_bh(&xfrm_policy_lock); | |
636 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
637 | write_unlock_bh(&xfrm_policy_lock); | |
638 | xfrm_pol_put(newp); | |
639 | } | |
640 | return newp; | |
641 | } | |
642 | ||
643 | int __xfrm_sk_clone_policy(struct sock *sk) | |
644 | { | |
645 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
646 | *p1 = sk->sk_policy[1]; | |
647 | ||
648 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
649 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
650 | return -ENOMEM; | |
651 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
652 | return -ENOMEM; | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* Resolve list of templates for the flow, given policy. */ | |
657 | ||
658 | static int | |
659 | xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl, | |
660 | struct xfrm_state **xfrm, | |
661 | unsigned short family) | |
662 | { | |
663 | int nx; | |
664 | int i, error; | |
665 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
666 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
667 | ||
668 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
669 | struct xfrm_state *x; | |
670 | xfrm_address_t *remote = daddr; | |
671 | xfrm_address_t *local = saddr; | |
672 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
673 | ||
674 | if (tmpl->mode) { | |
675 | remote = &tmpl->id.daddr; | |
676 | local = &tmpl->saddr; | |
677 | } | |
678 | ||
679 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
680 | ||
681 | if (x && x->km.state == XFRM_STATE_VALID) { | |
682 | xfrm[nx++] = x; | |
683 | daddr = remote; | |
684 | saddr = local; | |
685 | continue; | |
686 | } | |
687 | if (x) { | |
688 | error = (x->km.state == XFRM_STATE_ERROR ? | |
689 | -EINVAL : -EAGAIN); | |
690 | xfrm_state_put(x); | |
691 | } | |
692 | ||
693 | if (!tmpl->optional) | |
694 | goto fail; | |
695 | } | |
696 | return nx; | |
697 | ||
698 | fail: | |
699 | for (nx--; nx>=0; nx--) | |
700 | xfrm_state_put(xfrm[nx]); | |
701 | return error; | |
702 | } | |
703 | ||
704 | /* Check that the bundle accepts the flow and its components are | |
705 | * still valid. | |
706 | */ | |
707 | ||
708 | static struct dst_entry * | |
709 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
710 | { | |
711 | struct dst_entry *x; | |
712 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
713 | if (unlikely(afinfo == NULL)) | |
714 | return ERR_PTR(-EINVAL); | |
715 | x = afinfo->find_bundle(fl, policy); | |
716 | xfrm_policy_put_afinfo(afinfo); | |
717 | return x; | |
718 | } | |
719 | ||
720 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
721 | * all the metrics... Shortly, bundle a bundle. | |
722 | */ | |
723 | ||
724 | static int | |
725 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
726 | struct flowi *fl, struct dst_entry **dst_p, | |
727 | unsigned short family) | |
728 | { | |
729 | int err; | |
730 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
731 | if (unlikely(afinfo == NULL)) | |
732 | return -EINVAL; | |
733 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
734 | xfrm_policy_put_afinfo(afinfo); | |
735 | return err; | |
736 | } | |
737 | ||
738 | static inline int policy_to_flow_dir(int dir) | |
739 | { | |
740 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
741 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
742 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
743 | return dir; | |
744 | switch (dir) { | |
745 | default: | |
746 | case XFRM_POLICY_IN: | |
747 | return FLOW_DIR_IN; | |
748 | case XFRM_POLICY_OUT: | |
749 | return FLOW_DIR_OUT; | |
750 | case XFRM_POLICY_FWD: | |
751 | return FLOW_DIR_FWD; | |
752 | }; | |
753 | } | |
754 | ||
755 | static int stale_bundle(struct dst_entry *dst); | |
756 | ||
757 | /* Main function: finds/creates a bundle for given flow. | |
758 | * | |
759 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
760 | * on interfaces with disabled IPsec. | |
761 | */ | |
762 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
763 | struct sock *sk, int flags) | |
764 | { | |
765 | struct xfrm_policy *policy; | |
766 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
767 | struct dst_entry *dst, *dst_orig = *dst_p; | |
768 | int nx = 0; | |
769 | int err; | |
770 | u32 genid; | |
771 | u16 family = dst_orig->ops->family; | |
772 | restart: | |
773 | genid = atomic_read(&flow_cache_genid); | |
774 | policy = NULL; | |
775 | if (sk && sk->sk_policy[1]) | |
776 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
777 | ||
778 | if (!policy) { | |
779 | /* To accelerate a bit... */ | |
780 | if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT]) | |
781 | return 0; | |
782 | ||
783 | policy = flow_cache_lookup(fl, family, | |
784 | policy_to_flow_dir(XFRM_POLICY_OUT), | |
785 | xfrm_policy_lookup); | |
786 | } | |
787 | ||
788 | if (!policy) | |
789 | return 0; | |
790 | ||
791 | policy->curlft.use_time = (unsigned long)xtime.tv_sec; | |
792 | ||
793 | switch (policy->action) { | |
794 | case XFRM_POLICY_BLOCK: | |
795 | /* Prohibit the flow */ | |
e104411b PM |
796 | err = -EPERM; |
797 | goto error; | |
1da177e4 LT |
798 | |
799 | case XFRM_POLICY_ALLOW: | |
800 | if (policy->xfrm_nr == 0) { | |
801 | /* Flow passes not transformed. */ | |
802 | xfrm_pol_put(policy); | |
803 | return 0; | |
804 | } | |
805 | ||
806 | /* Try to find matching bundle. | |
807 | * | |
808 | * LATER: help from flow cache. It is optional, this | |
809 | * is required only for output policy. | |
810 | */ | |
811 | dst = xfrm_find_bundle(fl, policy, family); | |
812 | if (IS_ERR(dst)) { | |
e104411b PM |
813 | err = PTR_ERR(dst); |
814 | goto error; | |
1da177e4 LT |
815 | } |
816 | ||
817 | if (dst) | |
818 | break; | |
819 | ||
820 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
821 | ||
822 | if (unlikely(nx<0)) { | |
823 | err = nx; | |
824 | if (err == -EAGAIN && flags) { | |
825 | DECLARE_WAITQUEUE(wait, current); | |
826 | ||
827 | add_wait_queue(&km_waitq, &wait); | |
828 | set_current_state(TASK_INTERRUPTIBLE); | |
829 | schedule(); | |
830 | set_current_state(TASK_RUNNING); | |
831 | remove_wait_queue(&km_waitq, &wait); | |
832 | ||
833 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
834 | ||
835 | if (nx == -EAGAIN && signal_pending(current)) { | |
836 | err = -ERESTART; | |
837 | goto error; | |
838 | } | |
839 | if (nx == -EAGAIN || | |
840 | genid != atomic_read(&flow_cache_genid)) { | |
841 | xfrm_pol_put(policy); | |
842 | goto restart; | |
843 | } | |
844 | err = nx; | |
845 | } | |
846 | if (err < 0) | |
847 | goto error; | |
848 | } | |
849 | if (nx == 0) { | |
850 | /* Flow passes not transformed. */ | |
851 | xfrm_pol_put(policy); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | dst = dst_orig; | |
856 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
857 | ||
858 | if (unlikely(err)) { | |
859 | int i; | |
860 | for (i=0; i<nx; i++) | |
861 | xfrm_state_put(xfrm[i]); | |
862 | goto error; | |
863 | } | |
864 | ||
865 | write_lock_bh(&policy->lock); | |
866 | if (unlikely(policy->dead || stale_bundle(dst))) { | |
867 | /* Wow! While we worked on resolving, this | |
868 | * policy has gone. Retry. It is not paranoia, | |
869 | * we just cannot enlist new bundle to dead object. | |
870 | * We can't enlist stable bundles either. | |
871 | */ | |
872 | write_unlock_bh(&policy->lock); | |
873 | ||
874 | xfrm_pol_put(policy); | |
875 | if (dst) | |
876 | dst_free(dst); | |
877 | goto restart; | |
878 | } | |
879 | dst->next = policy->bundles; | |
880 | policy->bundles = dst; | |
881 | dst_hold(dst); | |
882 | write_unlock_bh(&policy->lock); | |
883 | } | |
884 | *dst_p = dst; | |
885 | dst_release(dst_orig); | |
886 | xfrm_pol_put(policy); | |
887 | return 0; | |
888 | ||
889 | error: | |
890 | dst_release(dst_orig); | |
891 | xfrm_pol_put(policy); | |
892 | *dst_p = NULL; | |
893 | return err; | |
894 | } | |
895 | EXPORT_SYMBOL(xfrm_lookup); | |
896 | ||
897 | /* When skb is transformed back to its "native" form, we have to | |
898 | * check policy restrictions. At the moment we make this in maximally | |
899 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
900 | * have policy cached at them. | |
901 | */ | |
902 | ||
903 | static inline int | |
904 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, | |
905 | unsigned short family) | |
906 | { | |
907 | if (xfrm_state_kern(x)) | |
908 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family); | |
909 | return x->id.proto == tmpl->id.proto && | |
910 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
911 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
912 | x->props.mode == tmpl->mode && | |
913 | (tmpl->aalgos & (1<<x->props.aalgo)) && | |
914 | !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family)); | |
915 | } | |
916 | ||
917 | static inline int | |
918 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
919 | unsigned short family) | |
920 | { | |
921 | int idx = start; | |
922 | ||
923 | if (tmpl->optional) { | |
924 | if (!tmpl->mode) | |
925 | return start; | |
926 | } else | |
927 | start = -1; | |
928 | for (; idx < sp->len; idx++) { | |
929 | if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family)) | |
930 | return ++idx; | |
931 | if (sp->x[idx].xvec->props.mode) | |
932 | break; | |
933 | } | |
934 | return start; | |
935 | } | |
936 | ||
937 | static int | |
938 | _decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
939 | { | |
940 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
941 | ||
942 | if (unlikely(afinfo == NULL)) | |
943 | return -EAFNOSUPPORT; | |
944 | ||
945 | afinfo->decode_session(skb, fl); | |
946 | xfrm_policy_put_afinfo(afinfo); | |
947 | return 0; | |
948 | } | |
949 | ||
950 | static inline int secpath_has_tunnel(struct sec_path *sp, int k) | |
951 | { | |
952 | for (; k < sp->len; k++) { | |
953 | if (sp->x[k].xvec->props.mode) | |
954 | return 1; | |
955 | } | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, | |
961 | unsigned short family) | |
962 | { | |
963 | struct xfrm_policy *pol; | |
964 | struct flowi fl; | |
965 | ||
966 | if (_decode_session(skb, &fl, family) < 0) | |
967 | return 0; | |
968 | ||
969 | /* First, check used SA against their selectors. */ | |
970 | if (skb->sp) { | |
971 | int i; | |
972 | ||
973 | for (i=skb->sp->len-1; i>=0; i--) { | |
974 | struct sec_decap_state *xvec = &(skb->sp->x[i]); | |
975 | if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family)) | |
976 | return 0; | |
977 | ||
978 | /* If there is a post_input processor, try running it */ | |
979 | if (xvec->xvec->type->post_input && | |
980 | (xvec->xvec->type->post_input)(xvec->xvec, | |
981 | &(xvec->decap), | |
982 | skb) != 0) | |
983 | return 0; | |
984 | } | |
985 | } | |
986 | ||
987 | pol = NULL; | |
988 | if (sk && sk->sk_policy[dir]) | |
989 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); | |
990 | ||
991 | if (!pol) | |
992 | pol = flow_cache_lookup(&fl, family, | |
993 | policy_to_flow_dir(dir), | |
994 | xfrm_policy_lookup); | |
995 | ||
996 | if (!pol) | |
997 | return !skb->sp || !secpath_has_tunnel(skb->sp, 0); | |
998 | ||
999 | pol->curlft.use_time = (unsigned long)xtime.tv_sec; | |
1000 | ||
1001 | if (pol->action == XFRM_POLICY_ALLOW) { | |
1002 | struct sec_path *sp; | |
1003 | static struct sec_path dummy; | |
1004 | int i, k; | |
1005 | ||
1006 | if ((sp = skb->sp) == NULL) | |
1007 | sp = &dummy; | |
1008 | ||
1009 | /* For each tunnel xfrm, find the first matching tmpl. | |
1010 | * For each tmpl before that, find corresponding xfrm. | |
1011 | * Order is _important_. Later we will implement | |
1012 | * some barriers, but at the moment barriers | |
1013 | * are implied between each two transformations. | |
1014 | */ | |
1015 | for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) { | |
1016 | k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family); | |
1017 | if (k < 0) | |
1018 | goto reject; | |
1019 | } | |
1020 | ||
1021 | if (secpath_has_tunnel(sp, k)) | |
1022 | goto reject; | |
1023 | ||
1024 | xfrm_pol_put(pol); | |
1025 | return 1; | |
1026 | } | |
1027 | ||
1028 | reject: | |
1029 | xfrm_pol_put(pol); | |
1030 | return 0; | |
1031 | } | |
1032 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1033 | ||
1034 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1035 | { | |
1036 | struct flowi fl; | |
1037 | ||
1038 | if (_decode_session(skb, &fl, family) < 0) | |
1039 | return 0; | |
1040 | ||
1041 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1042 | } | |
1043 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1044 | ||
1da177e4 LT |
1045 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1046 | { | |
399c180a DM |
1047 | /* If it is marked obsolete, which is how we even get here, |
1048 | * then we have purged it from the policy bundle list and we | |
1049 | * did that for a good reason. | |
1050 | */ | |
1da177e4 LT |
1051 | return NULL; |
1052 | } | |
1053 | ||
1054 | static int stale_bundle(struct dst_entry *dst) | |
1055 | { | |
1056 | return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC); | |
1057 | } | |
1058 | ||
aabc9761 | 1059 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1060 | { |
1da177e4 LT |
1061 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1062 | dst->dev = &loopback_dev; | |
1063 | dev_hold(&loopback_dev); | |
1064 | dev_put(dev); | |
1065 | } | |
1066 | } | |
aabc9761 | 1067 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1068 | |
1069 | static void xfrm_link_failure(struct sk_buff *skb) | |
1070 | { | |
1071 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1072 | return; | |
1073 | } | |
1074 | ||
1075 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1076 | { | |
1077 | if (dst) { | |
1078 | if (dst->obsolete) { | |
1079 | dst_release(dst); | |
1080 | dst = NULL; | |
1081 | } | |
1082 | } | |
1083 | return dst; | |
1084 | } | |
1085 | ||
1086 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) | |
1087 | { | |
1088 | int i; | |
1089 | struct xfrm_policy *pol; | |
1090 | struct dst_entry *dst, **dstp, *gc_list = NULL; | |
1091 | ||
1092 | read_lock_bh(&xfrm_policy_lock); | |
1093 | for (i=0; i<2*XFRM_POLICY_MAX; i++) { | |
1094 | for (pol = xfrm_policy_list[i]; pol; pol = pol->next) { | |
1095 | write_lock(&pol->lock); | |
1096 | dstp = &pol->bundles; | |
1097 | while ((dst=*dstp) != NULL) { | |
1098 | if (func(dst)) { | |
1099 | *dstp = dst->next; | |
1100 | dst->next = gc_list; | |
1101 | gc_list = dst; | |
1102 | } else { | |
1103 | dstp = &dst->next; | |
1104 | } | |
1105 | } | |
1106 | write_unlock(&pol->lock); | |
1107 | } | |
1108 | } | |
1109 | read_unlock_bh(&xfrm_policy_lock); | |
1110 | ||
1111 | while (gc_list) { | |
1112 | dst = gc_list; | |
1113 | gc_list = dst->next; | |
1114 | dst_free(dst); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | static int unused_bundle(struct dst_entry *dst) | |
1119 | { | |
1120 | return !atomic_read(&dst->__refcnt); | |
1121 | } | |
1122 | ||
1123 | static void __xfrm_garbage_collect(void) | |
1124 | { | |
1125 | xfrm_prune_bundles(unused_bundle); | |
1126 | } | |
1127 | ||
1128 | int xfrm_flush_bundles(void) | |
1129 | { | |
1130 | xfrm_prune_bundles(stale_bundle); | |
1131 | return 0; | |
1132 | } | |
1133 | ||
399c180a DM |
1134 | static int always_true(struct dst_entry *dst) |
1135 | { | |
1136 | return 1; | |
1137 | } | |
1138 | ||
1139 | void xfrm_flush_all_bundles(void) | |
1140 | { | |
1141 | xfrm_prune_bundles(always_true); | |
1142 | } | |
1143 | ||
1da177e4 LT |
1144 | void xfrm_init_pmtu(struct dst_entry *dst) |
1145 | { | |
1146 | do { | |
1147 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1148 | u32 pmtu, route_mtu_cached; | |
1149 | ||
1150 | pmtu = dst_mtu(dst->child); | |
1151 | xdst->child_mtu_cached = pmtu; | |
1152 | ||
1153 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1154 | ||
1155 | route_mtu_cached = dst_mtu(xdst->route); | |
1156 | xdst->route_mtu_cached = route_mtu_cached; | |
1157 | ||
1158 | if (pmtu > route_mtu_cached) | |
1159 | pmtu = route_mtu_cached; | |
1160 | ||
1161 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1162 | } while ((dst = dst->next)); | |
1163 | } | |
1164 | ||
1165 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1166 | ||
1167 | /* Check that the bundle accepts the flow and its components are | |
1168 | * still valid. | |
1169 | */ | |
1170 | ||
1171 | int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family) | |
1172 | { | |
1173 | struct dst_entry *dst = &first->u.dst; | |
1174 | struct xfrm_dst *last; | |
1175 | u32 mtu; | |
1176 | ||
92d63dec | 1177 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1178 | (dst->dev && !netif_running(dst->dev))) |
1179 | return 0; | |
1180 | ||
1181 | last = NULL; | |
1182 | ||
1183 | do { | |
1184 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1185 | ||
1186 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1187 | return 0; | |
1188 | if (dst->xfrm->km.state != XFRM_STATE_VALID) | |
1189 | return 0; | |
1190 | ||
1191 | mtu = dst_mtu(dst->child); | |
1192 | if (xdst->child_mtu_cached != mtu) { | |
1193 | last = xdst; | |
1194 | xdst->child_mtu_cached = mtu; | |
1195 | } | |
1196 | ||
92d63dec | 1197 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1198 | return 0; |
1199 | mtu = dst_mtu(xdst->route); | |
1200 | if (xdst->route_mtu_cached != mtu) { | |
1201 | last = xdst; | |
1202 | xdst->route_mtu_cached = mtu; | |
1203 | } | |
1204 | ||
1205 | dst = dst->child; | |
1206 | } while (dst->xfrm); | |
1207 | ||
1208 | if (likely(!last)) | |
1209 | return 1; | |
1210 | ||
1211 | mtu = last->child_mtu_cached; | |
1212 | for (;;) { | |
1213 | dst = &last->u.dst; | |
1214 | ||
1215 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1216 | if (mtu > last->route_mtu_cached) | |
1217 | mtu = last->route_mtu_cached; | |
1218 | dst->metrics[RTAX_MTU-1] = mtu; | |
1219 | ||
1220 | if (last == first) | |
1221 | break; | |
1222 | ||
1223 | last = last->u.next; | |
1224 | last->child_mtu_cached = mtu; | |
1225 | } | |
1226 | ||
1227 | return 1; | |
1228 | } | |
1229 | ||
1230 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
1231 | ||
1da177e4 LT |
1232 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
1233 | { | |
1234 | int err = 0; | |
1235 | if (unlikely(afinfo == NULL)) | |
1236 | return -EINVAL; | |
1237 | if (unlikely(afinfo->family >= NPROTO)) | |
1238 | return -EAFNOSUPPORT; | |
1239 | write_lock(&xfrm_policy_afinfo_lock); | |
1240 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) | |
1241 | err = -ENOBUFS; | |
1242 | else { | |
1243 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1244 | if (likely(dst_ops->kmem_cachep == NULL)) | |
1245 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
1246 | if (likely(dst_ops->check == NULL)) | |
1247 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
1248 | if (likely(dst_ops->negative_advice == NULL)) |
1249 | dst_ops->negative_advice = xfrm_negative_advice; | |
1250 | if (likely(dst_ops->link_failure == NULL)) | |
1251 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
1252 | if (likely(afinfo->garbage_collect == NULL)) |
1253 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
1254 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
1255 | } | |
1256 | write_unlock(&xfrm_policy_afinfo_lock); | |
1257 | return err; | |
1258 | } | |
1259 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
1260 | ||
1261 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1262 | { | |
1263 | int err = 0; | |
1264 | if (unlikely(afinfo == NULL)) | |
1265 | return -EINVAL; | |
1266 | if (unlikely(afinfo->family >= NPROTO)) | |
1267 | return -EAFNOSUPPORT; | |
1268 | write_lock(&xfrm_policy_afinfo_lock); | |
1269 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { | |
1270 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
1271 | err = -EINVAL; | |
1272 | else { | |
1273 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1274 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
1275 | dst_ops->kmem_cachep = NULL; | |
1276 | dst_ops->check = NULL; | |
1da177e4 LT |
1277 | dst_ops->negative_advice = NULL; |
1278 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
1279 | afinfo->garbage_collect = NULL; |
1280 | } | |
1281 | } | |
1282 | write_unlock(&xfrm_policy_afinfo_lock); | |
1283 | return err; | |
1284 | } | |
1285 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
1286 | ||
1287 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
1288 | { | |
1289 | struct xfrm_policy_afinfo *afinfo; | |
1290 | if (unlikely(family >= NPROTO)) | |
1291 | return NULL; | |
1292 | read_lock(&xfrm_policy_afinfo_lock); | |
1293 | afinfo = xfrm_policy_afinfo[family]; | |
1294 | if (likely(afinfo != NULL)) | |
1295 | read_lock(&afinfo->lock); | |
1296 | read_unlock(&xfrm_policy_afinfo_lock); | |
1297 | return afinfo; | |
1298 | } | |
1299 | ||
1300 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1301 | { | |
1302 | if (unlikely(afinfo == NULL)) | |
1303 | return; | |
1304 | read_unlock(&afinfo->lock); | |
1305 | } | |
1306 | ||
1307 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1308 | { | |
1309 | switch (event) { | |
1310 | case NETDEV_DOWN: | |
1311 | xfrm_flush_bundles(); | |
1312 | } | |
1313 | return NOTIFY_DONE; | |
1314 | } | |
1315 | ||
1316 | static struct notifier_block xfrm_dev_notifier = { | |
1317 | xfrm_dev_event, | |
1318 | NULL, | |
1319 | 0 | |
1320 | }; | |
1321 | ||
1322 | static void __init xfrm_policy_init(void) | |
1323 | { | |
1324 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1325 | sizeof(struct xfrm_dst), | |
1326 | 0, SLAB_HWCACHE_ALIGN, | |
1327 | NULL, NULL); | |
1328 | if (!xfrm_dst_cache) | |
1329 | panic("XFRM: failed to allocate xfrm_dst_cache\n"); | |
1330 | ||
1331 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL); | |
1332 | register_netdevice_notifier(&xfrm_dev_notifier); | |
1333 | } | |
1334 | ||
1335 | void __init xfrm_init(void) | |
1336 | { | |
1337 | xfrm_state_init(); | |
1338 | xfrm_policy_init(); | |
1339 | xfrm_input_init(); | |
1340 | } | |
1341 |