Commit | Line | Data |
---|---|---|
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 | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
1da177e4 LT |
16 | #include <linux/config.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 LT |
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 | { | |
09a62660 | 250 | BUG_ON(!policy->dead); |
1da177e4 | 251 | |
09a62660 | 252 | BUG_ON(policy->bundles); |
1da177e4 LT |
253 | |
254 | if (del_timer(&policy->timer)) | |
255 | BUG(); | |
256 | ||
df71837d | 257 | security_xfrm_policy_free(policy); |
1da177e4 LT |
258 | kfree(policy); |
259 | } | |
260 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
261 | ||
262 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
263 | { | |
264 | struct dst_entry *dst; | |
265 | ||
266 | while ((dst = policy->bundles) != NULL) { | |
267 | policy->bundles = dst->next; | |
268 | dst_free(dst); | |
269 | } | |
270 | ||
271 | if (del_timer(&policy->timer)) | |
272 | atomic_dec(&policy->refcnt); | |
273 | ||
274 | if (atomic_read(&policy->refcnt) > 1) | |
275 | flow_cache_flush(); | |
276 | ||
277 | xfrm_pol_put(policy); | |
278 | } | |
279 | ||
280 | static void xfrm_policy_gc_task(void *data) | |
281 | { | |
282 | struct xfrm_policy *policy; | |
283 | struct list_head *entry, *tmp; | |
284 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); | |
285 | ||
286 | spin_lock_bh(&xfrm_policy_gc_lock); | |
287 | list_splice_init(&xfrm_policy_gc_list, &gc_list); | |
288 | spin_unlock_bh(&xfrm_policy_gc_lock); | |
289 | ||
290 | list_for_each_safe(entry, tmp, &gc_list) { | |
291 | policy = list_entry(entry, struct xfrm_policy, list); | |
292 | xfrm_policy_gc_kill(policy); | |
293 | } | |
294 | } | |
295 | ||
296 | /* Rule must be locked. Release descentant resources, announce | |
297 | * entry dead. The rule must be unlinked from lists to the moment. | |
298 | */ | |
299 | ||
300 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
301 | { | |
302 | int dead; | |
303 | ||
304 | write_lock_bh(&policy->lock); | |
305 | dead = policy->dead; | |
306 | policy->dead = 1; | |
307 | write_unlock_bh(&policy->lock); | |
308 | ||
309 | if (unlikely(dead)) { | |
310 | WARN_ON(1); | |
311 | return; | |
312 | } | |
313 | ||
314 | spin_lock(&xfrm_policy_gc_lock); | |
315 | list_add(&policy->list, &xfrm_policy_gc_list); | |
316 | spin_unlock(&xfrm_policy_gc_lock); | |
317 | ||
318 | schedule_work(&xfrm_policy_gc_work); | |
319 | } | |
320 | ||
321 | /* Generate new index... KAME seems to generate them ordered by cost | |
322 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
323 | static u32 xfrm_gen_index(int dir) | |
324 | { | |
325 | u32 idx; | |
326 | struct xfrm_policy *p; | |
327 | static u32 idx_generator; | |
328 | ||
329 | for (;;) { | |
330 | idx = (idx_generator | dir); | |
331 | idx_generator += 8; | |
332 | if (idx == 0) | |
333 | idx = 8; | |
334 | for (p = xfrm_policy_list[dir]; p; p = p->next) { | |
335 | if (p->index == idx) | |
336 | break; | |
337 | } | |
338 | if (!p) | |
339 | return idx; | |
340 | } | |
341 | } | |
342 | ||
343 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) | |
344 | { | |
345 | struct xfrm_policy *pol, **p; | |
346 | struct xfrm_policy *delpol = NULL; | |
347 | struct xfrm_policy **newpos = NULL; | |
9b78a82c | 348 | struct dst_entry *gc_list; |
1da177e4 LT |
349 | |
350 | write_lock_bh(&xfrm_policy_lock); | |
351 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) { | |
df71837d TJ |
352 | if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 && |
353 | xfrm_sec_ctx_match(pol->security, policy->security)) { | |
1da177e4 LT |
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 | ||
df71837d TJ |
419 | struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, |
420 | struct xfrm_sec_ctx *ctx, int delete) | |
1da177e4 LT |
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) { | |
df71837d TJ |
426 | if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) && |
427 | (xfrm_sec_ctx_match(ctx, pol->security))) { | |
1da177e4 LT |
428 | xfrm_pol_hold(pol); |
429 | if (delete) | |
430 | *p = pol->next; | |
431 | break; | |
432 | } | |
433 | } | |
434 | write_unlock_bh(&xfrm_policy_lock); | |
435 | ||
436 | if (pol && delete) { | |
437 | atomic_inc(&flow_cache_genid); | |
438 | xfrm_policy_kill(pol); | |
439 | } | |
440 | return pol; | |
441 | } | |
df71837d | 442 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 LT |
443 | |
444 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete) | |
445 | { | |
446 | struct xfrm_policy *pol, **p; | |
447 | ||
448 | write_lock_bh(&xfrm_policy_lock); | |
77d8d7a6 | 449 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) { |
1da177e4 LT |
450 | if (pol->index == id) { |
451 | xfrm_pol_hold(pol); | |
452 | if (delete) | |
453 | *p = pol->next; | |
454 | break; | |
455 | } | |
456 | } | |
457 | write_unlock_bh(&xfrm_policy_lock); | |
458 | ||
459 | if (pol && delete) { | |
460 | atomic_inc(&flow_cache_genid); | |
461 | xfrm_policy_kill(pol); | |
462 | } | |
463 | return pol; | |
464 | } | |
465 | EXPORT_SYMBOL(xfrm_policy_byid); | |
466 | ||
467 | void xfrm_policy_flush(void) | |
468 | { | |
469 | struct xfrm_policy *xp; | |
470 | int dir; | |
471 | ||
472 | write_lock_bh(&xfrm_policy_lock); | |
473 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
474 | while ((xp = xfrm_policy_list[dir]) != NULL) { | |
475 | xfrm_policy_list[dir] = xp->next; | |
476 | write_unlock_bh(&xfrm_policy_lock); | |
477 | ||
478 | xfrm_policy_kill(xp); | |
479 | ||
480 | write_lock_bh(&xfrm_policy_lock); | |
481 | } | |
482 | } | |
483 | atomic_inc(&flow_cache_genid); | |
484 | write_unlock_bh(&xfrm_policy_lock); | |
485 | } | |
486 | EXPORT_SYMBOL(xfrm_policy_flush); | |
487 | ||
488 | int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), | |
489 | void *data) | |
490 | { | |
491 | struct xfrm_policy *xp; | |
492 | int dir; | |
493 | int count = 0; | |
494 | int error = 0; | |
495 | ||
496 | read_lock_bh(&xfrm_policy_lock); | |
497 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
498 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) | |
499 | count++; | |
500 | } | |
501 | ||
502 | if (count == 0) { | |
503 | error = -ENOENT; | |
504 | goto out; | |
505 | } | |
506 | ||
507 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
508 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) { | |
509 | error = func(xp, dir%XFRM_POLICY_MAX, --count, data); | |
510 | if (error) | |
511 | goto out; | |
512 | } | |
513 | } | |
514 | ||
515 | out: | |
516 | read_unlock_bh(&xfrm_policy_lock); | |
517 | return error; | |
518 | } | |
519 | EXPORT_SYMBOL(xfrm_policy_walk); | |
520 | ||
521 | /* Find policy to apply to this flow. */ | |
522 | ||
df71837d | 523 | static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir, |
1da177e4 LT |
524 | void **objp, atomic_t **obj_refp) |
525 | { | |
526 | struct xfrm_policy *pol; | |
527 | ||
528 | read_lock_bh(&xfrm_policy_lock); | |
529 | for (pol = xfrm_policy_list[dir]; pol; pol = pol->next) { | |
530 | struct xfrm_selector *sel = &pol->selector; | |
531 | int match; | |
532 | ||
533 | if (pol->family != family) | |
534 | continue; | |
535 | ||
536 | match = xfrm_selector_match(sel, fl, family); | |
df71837d | 537 | |
1da177e4 | 538 | if (match) { |
df71837d TJ |
539 | if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) { |
540 | xfrm_pol_hold(pol); | |
541 | break; | |
542 | } | |
1da177e4 LT |
543 | } |
544 | } | |
545 | read_unlock_bh(&xfrm_policy_lock); | |
546 | if ((*objp = (void *) pol) != NULL) | |
547 | *obj_refp = &pol->refcnt; | |
548 | } | |
549 | ||
df71837d TJ |
550 | static inline int policy_to_flow_dir(int dir) |
551 | { | |
552 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
553 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
554 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
555 | return dir; | |
556 | switch (dir) { | |
557 | default: | |
558 | case XFRM_POLICY_IN: | |
559 | return FLOW_DIR_IN; | |
560 | case XFRM_POLICY_OUT: | |
561 | return FLOW_DIR_OUT; | |
562 | case XFRM_POLICY_FWD: | |
563 | return FLOW_DIR_FWD; | |
564 | }; | |
565 | } | |
566 | ||
567 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid) | |
1da177e4 LT |
568 | { |
569 | struct xfrm_policy *pol; | |
570 | ||
571 | read_lock_bh(&xfrm_policy_lock); | |
572 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
df71837d | 573 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 574 | sk->sk_family); |
df71837d TJ |
575 | int err = 0; |
576 | ||
1da177e4 | 577 | if (match) |
df71837d TJ |
578 | err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir)); |
579 | ||
580 | if (match && !err) | |
1da177e4 LT |
581 | xfrm_pol_hold(pol); |
582 | else | |
583 | pol = NULL; | |
584 | } | |
585 | read_unlock_bh(&xfrm_policy_lock); | |
586 | return pol; | |
587 | } | |
588 | ||
589 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
590 | { | |
591 | pol->next = xfrm_policy_list[dir]; | |
592 | xfrm_policy_list[dir] = pol; | |
593 | xfrm_pol_hold(pol); | |
594 | } | |
595 | ||
596 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
597 | int dir) | |
598 | { | |
599 | struct xfrm_policy **polp; | |
600 | ||
601 | for (polp = &xfrm_policy_list[dir]; | |
602 | *polp != NULL; polp = &(*polp)->next) { | |
603 | if (*polp == pol) { | |
604 | *polp = pol->next; | |
605 | return pol; | |
606 | } | |
607 | } | |
608 | return NULL; | |
609 | } | |
610 | ||
4666faab | 611 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
612 | { |
613 | write_lock_bh(&xfrm_policy_lock); | |
614 | pol = __xfrm_policy_unlink(pol, dir); | |
615 | write_unlock_bh(&xfrm_policy_lock); | |
616 | if (pol) { | |
617 | if (dir < XFRM_POLICY_MAX) | |
618 | atomic_inc(&flow_cache_genid); | |
619 | xfrm_policy_kill(pol); | |
4666faab | 620 | return 0; |
1da177e4 | 621 | } |
4666faab | 622 | return -ENOENT; |
1da177e4 LT |
623 | } |
624 | ||
625 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
626 | { | |
627 | struct xfrm_policy *old_pol; | |
628 | ||
629 | write_lock_bh(&xfrm_policy_lock); | |
630 | old_pol = sk->sk_policy[dir]; | |
631 | sk->sk_policy[dir] = pol; | |
632 | if (pol) { | |
633 | pol->curlft.add_time = (unsigned long)xtime.tv_sec; | |
634 | pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir); | |
635 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); | |
636 | } | |
637 | if (old_pol) | |
638 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
639 | write_unlock_bh(&xfrm_policy_lock); | |
640 | ||
641 | if (old_pol) { | |
642 | xfrm_policy_kill(old_pol); | |
643 | } | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
648 | { | |
649 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
650 | ||
651 | if (newp) { | |
652 | newp->selector = old->selector; | |
df71837d TJ |
653 | if (security_xfrm_policy_clone(old, newp)) { |
654 | kfree(newp); | |
655 | return NULL; /* ENOMEM */ | |
656 | } | |
1da177e4 LT |
657 | newp->lft = old->lft; |
658 | newp->curlft = old->curlft; | |
659 | newp->action = old->action; | |
660 | newp->flags = old->flags; | |
661 | newp->xfrm_nr = old->xfrm_nr; | |
662 | newp->index = old->index; | |
663 | memcpy(newp->xfrm_vec, old->xfrm_vec, | |
664 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
665 | write_lock_bh(&xfrm_policy_lock); | |
666 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
667 | write_unlock_bh(&xfrm_policy_lock); | |
668 | xfrm_pol_put(newp); | |
669 | } | |
670 | return newp; | |
671 | } | |
672 | ||
673 | int __xfrm_sk_clone_policy(struct sock *sk) | |
674 | { | |
675 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
676 | *p1 = sk->sk_policy[1]; | |
677 | ||
678 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
679 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
680 | return -ENOMEM; | |
681 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
682 | return -ENOMEM; | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /* Resolve list of templates for the flow, given policy. */ | |
687 | ||
688 | static int | |
689 | xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl, | |
690 | struct xfrm_state **xfrm, | |
691 | unsigned short family) | |
692 | { | |
693 | int nx; | |
694 | int i, error; | |
695 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
696 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
697 | ||
698 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
699 | struct xfrm_state *x; | |
700 | xfrm_address_t *remote = daddr; | |
701 | xfrm_address_t *local = saddr; | |
702 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
703 | ||
704 | if (tmpl->mode) { | |
705 | remote = &tmpl->id.daddr; | |
706 | local = &tmpl->saddr; | |
707 | } | |
708 | ||
709 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
710 | ||
711 | if (x && x->km.state == XFRM_STATE_VALID) { | |
712 | xfrm[nx++] = x; | |
713 | daddr = remote; | |
714 | saddr = local; | |
715 | continue; | |
716 | } | |
717 | if (x) { | |
718 | error = (x->km.state == XFRM_STATE_ERROR ? | |
719 | -EINVAL : -EAGAIN); | |
720 | xfrm_state_put(x); | |
721 | } | |
722 | ||
723 | if (!tmpl->optional) | |
724 | goto fail; | |
725 | } | |
726 | return nx; | |
727 | ||
728 | fail: | |
729 | for (nx--; nx>=0; nx--) | |
730 | xfrm_state_put(xfrm[nx]); | |
731 | return error; | |
732 | } | |
733 | ||
734 | /* Check that the bundle accepts the flow and its components are | |
735 | * still valid. | |
736 | */ | |
737 | ||
738 | static struct dst_entry * | |
739 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
740 | { | |
741 | struct dst_entry *x; | |
742 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
743 | if (unlikely(afinfo == NULL)) | |
744 | return ERR_PTR(-EINVAL); | |
745 | x = afinfo->find_bundle(fl, policy); | |
746 | xfrm_policy_put_afinfo(afinfo); | |
747 | return x; | |
748 | } | |
749 | ||
750 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
751 | * all the metrics... Shortly, bundle a bundle. | |
752 | */ | |
753 | ||
754 | static int | |
755 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
756 | struct flowi *fl, struct dst_entry **dst_p, | |
757 | unsigned short family) | |
758 | { | |
759 | int err; | |
760 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
761 | if (unlikely(afinfo == NULL)) | |
762 | return -EINVAL; | |
763 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
764 | xfrm_policy_put_afinfo(afinfo); | |
765 | return err; | |
766 | } | |
767 | ||
1da177e4 LT |
768 | |
769 | static int stale_bundle(struct dst_entry *dst); | |
770 | ||
771 | /* Main function: finds/creates a bundle for given flow. | |
772 | * | |
773 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
774 | * on interfaces with disabled IPsec. | |
775 | */ | |
776 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
777 | struct sock *sk, int flags) | |
778 | { | |
779 | struct xfrm_policy *policy; | |
780 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
781 | struct dst_entry *dst, *dst_orig = *dst_p; | |
782 | int nx = 0; | |
783 | int err; | |
784 | u32 genid; | |
42cf93cd | 785 | u16 family; |
df71837d TJ |
786 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
787 | u32 sk_sid = security_sk_sid(sk, fl, dir); | |
1da177e4 LT |
788 | restart: |
789 | genid = atomic_read(&flow_cache_genid); | |
790 | policy = NULL; | |
791 | if (sk && sk->sk_policy[1]) | |
df71837d | 792 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid); |
1da177e4 LT |
793 | |
794 | if (!policy) { | |
795 | /* To accelerate a bit... */ | |
796 | if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT]) | |
797 | return 0; | |
798 | ||
42cf93cd PM |
799 | policy = flow_cache_lookup(fl, sk_sid, dst_orig->ops->family, |
800 | dir, xfrm_policy_lookup); | |
1da177e4 LT |
801 | } |
802 | ||
803 | if (!policy) | |
804 | return 0; | |
805 | ||
42cf93cd | 806 | family = dst_orig->ops->family; |
1da177e4 LT |
807 | policy->curlft.use_time = (unsigned long)xtime.tv_sec; |
808 | ||
809 | switch (policy->action) { | |
810 | case XFRM_POLICY_BLOCK: | |
811 | /* Prohibit the flow */ | |
e104411b PM |
812 | err = -EPERM; |
813 | goto error; | |
1da177e4 LT |
814 | |
815 | case XFRM_POLICY_ALLOW: | |
816 | if (policy->xfrm_nr == 0) { | |
817 | /* Flow passes not transformed. */ | |
818 | xfrm_pol_put(policy); | |
819 | return 0; | |
820 | } | |
821 | ||
822 | /* Try to find matching bundle. | |
823 | * | |
824 | * LATER: help from flow cache. It is optional, this | |
825 | * is required only for output policy. | |
826 | */ | |
827 | dst = xfrm_find_bundle(fl, policy, family); | |
828 | if (IS_ERR(dst)) { | |
e104411b PM |
829 | err = PTR_ERR(dst); |
830 | goto error; | |
1da177e4 LT |
831 | } |
832 | ||
833 | if (dst) | |
834 | break; | |
835 | ||
836 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
837 | ||
838 | if (unlikely(nx<0)) { | |
839 | err = nx; | |
840 | if (err == -EAGAIN && flags) { | |
841 | DECLARE_WAITQUEUE(wait, current); | |
842 | ||
843 | add_wait_queue(&km_waitq, &wait); | |
844 | set_current_state(TASK_INTERRUPTIBLE); | |
845 | schedule(); | |
846 | set_current_state(TASK_RUNNING); | |
847 | remove_wait_queue(&km_waitq, &wait); | |
848 | ||
849 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
850 | ||
851 | if (nx == -EAGAIN && signal_pending(current)) { | |
852 | err = -ERESTART; | |
853 | goto error; | |
854 | } | |
855 | if (nx == -EAGAIN || | |
856 | genid != atomic_read(&flow_cache_genid)) { | |
857 | xfrm_pol_put(policy); | |
858 | goto restart; | |
859 | } | |
860 | err = nx; | |
861 | } | |
862 | if (err < 0) | |
863 | goto error; | |
864 | } | |
865 | if (nx == 0) { | |
866 | /* Flow passes not transformed. */ | |
867 | xfrm_pol_put(policy); | |
868 | return 0; | |
869 | } | |
870 | ||
871 | dst = dst_orig; | |
872 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
873 | ||
874 | if (unlikely(err)) { | |
875 | int i; | |
876 | for (i=0; i<nx; i++) | |
877 | xfrm_state_put(xfrm[i]); | |
878 | goto error; | |
879 | } | |
880 | ||
881 | write_lock_bh(&policy->lock); | |
882 | if (unlikely(policy->dead || stale_bundle(dst))) { | |
883 | /* Wow! While we worked on resolving, this | |
884 | * policy has gone. Retry. It is not paranoia, | |
885 | * we just cannot enlist new bundle to dead object. | |
886 | * We can't enlist stable bundles either. | |
887 | */ | |
888 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
889 | if (dst) |
890 | dst_free(dst); | |
00de651d HX |
891 | |
892 | err = -EHOSTUNREACH; | |
893 | goto error; | |
1da177e4 LT |
894 | } |
895 | dst->next = policy->bundles; | |
896 | policy->bundles = dst; | |
897 | dst_hold(dst); | |
898 | write_unlock_bh(&policy->lock); | |
899 | } | |
900 | *dst_p = dst; | |
901 | dst_release(dst_orig); | |
902 | xfrm_pol_put(policy); | |
903 | return 0; | |
904 | ||
905 | error: | |
906 | dst_release(dst_orig); | |
907 | xfrm_pol_put(policy); | |
908 | *dst_p = NULL; | |
909 | return err; | |
910 | } | |
911 | EXPORT_SYMBOL(xfrm_lookup); | |
912 | ||
913 | /* When skb is transformed back to its "native" form, we have to | |
914 | * check policy restrictions. At the moment we make this in maximally | |
915 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
916 | * have policy cached at them. | |
917 | */ | |
918 | ||
919 | static inline int | |
920 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, | |
921 | unsigned short family) | |
922 | { | |
923 | if (xfrm_state_kern(x)) | |
924 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family); | |
925 | return x->id.proto == tmpl->id.proto && | |
926 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
927 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
928 | x->props.mode == tmpl->mode && | |
929 | (tmpl->aalgos & (1<<x->props.aalgo)) && | |
930 | !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family)); | |
931 | } | |
932 | ||
933 | static inline int | |
934 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
935 | unsigned short family) | |
936 | { | |
937 | int idx = start; | |
938 | ||
939 | if (tmpl->optional) { | |
940 | if (!tmpl->mode) | |
941 | return start; | |
942 | } else | |
943 | start = -1; | |
944 | for (; idx < sp->len; idx++) { | |
945 | if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family)) | |
946 | return ++idx; | |
947 | if (sp->x[idx].xvec->props.mode) | |
948 | break; | |
949 | } | |
950 | return start; | |
951 | } | |
952 | ||
3e3850e9 PM |
953 | int |
954 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
955 | { |
956 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
957 | ||
958 | if (unlikely(afinfo == NULL)) | |
959 | return -EAFNOSUPPORT; | |
960 | ||
961 | afinfo->decode_session(skb, fl); | |
962 | xfrm_policy_put_afinfo(afinfo); | |
963 | return 0; | |
964 | } | |
3e3850e9 | 965 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 LT |
966 | |
967 | static inline int secpath_has_tunnel(struct sec_path *sp, int k) | |
968 | { | |
969 | for (; k < sp->len; k++) { | |
970 | if (sp->x[k].xvec->props.mode) | |
971 | return 1; | |
972 | } | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
977 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, | |
978 | unsigned short family) | |
979 | { | |
980 | struct xfrm_policy *pol; | |
981 | struct flowi fl; | |
df71837d TJ |
982 | u8 fl_dir = policy_to_flow_dir(dir); |
983 | u32 sk_sid; | |
1da177e4 | 984 | |
3e3850e9 | 985 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 986 | return 0; |
eb9c7ebe | 987 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 | 988 | |
df71837d TJ |
989 | sk_sid = security_sk_sid(sk, &fl, fl_dir); |
990 | ||
1da177e4 LT |
991 | /* First, check used SA against their selectors. */ |
992 | if (skb->sp) { | |
993 | int i; | |
994 | ||
995 | for (i=skb->sp->len-1; i>=0; i--) { | |
df71837d | 996 | struct sec_decap_state *xvec = &(skb->sp->x[i]); |
1da177e4 LT |
997 | if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family)) |
998 | return 0; | |
1da177e4 LT |
999 | } |
1000 | } | |
1001 | ||
1002 | pol = NULL; | |
1003 | if (sk && sk->sk_policy[dir]) | |
df71837d | 1004 | pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid); |
1da177e4 LT |
1005 | |
1006 | if (!pol) | |
df71837d | 1007 | pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir, |
1da177e4 LT |
1008 | xfrm_policy_lookup); |
1009 | ||
1010 | if (!pol) | |
1011 | return !skb->sp || !secpath_has_tunnel(skb->sp, 0); | |
1012 | ||
1013 | pol->curlft.use_time = (unsigned long)xtime.tv_sec; | |
1014 | ||
1015 | if (pol->action == XFRM_POLICY_ALLOW) { | |
1016 | struct sec_path *sp; | |
1017 | static struct sec_path dummy; | |
1018 | int i, k; | |
1019 | ||
1020 | if ((sp = skb->sp) == NULL) | |
1021 | sp = &dummy; | |
1022 | ||
1023 | /* For each tunnel xfrm, find the first matching tmpl. | |
1024 | * For each tmpl before that, find corresponding xfrm. | |
1025 | * Order is _important_. Later we will implement | |
1026 | * some barriers, but at the moment barriers | |
1027 | * are implied between each two transformations. | |
1028 | */ | |
1029 | for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) { | |
1030 | k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family); | |
1031 | if (k < 0) | |
1032 | goto reject; | |
1033 | } | |
1034 | ||
1035 | if (secpath_has_tunnel(sp, k)) | |
1036 | goto reject; | |
1037 | ||
1038 | xfrm_pol_put(pol); | |
1039 | return 1; | |
1040 | } | |
1041 | ||
1042 | reject: | |
1043 | xfrm_pol_put(pol); | |
1044 | return 0; | |
1045 | } | |
1046 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1047 | ||
1048 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1049 | { | |
1050 | struct flowi fl; | |
1051 | ||
3e3850e9 | 1052 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1053 | return 0; |
1054 | ||
1055 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1056 | } | |
1057 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1058 | ||
1da177e4 LT |
1059 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1060 | { | |
399c180a DM |
1061 | /* If it is marked obsolete, which is how we even get here, |
1062 | * then we have purged it from the policy bundle list and we | |
1063 | * did that for a good reason. | |
1064 | */ | |
1da177e4 LT |
1065 | return NULL; |
1066 | } | |
1067 | ||
1068 | static int stale_bundle(struct dst_entry *dst) | |
1069 | { | |
1070 | return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC); | |
1071 | } | |
1072 | ||
aabc9761 | 1073 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1074 | { |
1da177e4 LT |
1075 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1076 | dst->dev = &loopback_dev; | |
1077 | dev_hold(&loopback_dev); | |
1078 | dev_put(dev); | |
1079 | } | |
1080 | } | |
aabc9761 | 1081 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1082 | |
1083 | static void xfrm_link_failure(struct sk_buff *skb) | |
1084 | { | |
1085 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1090 | { | |
1091 | if (dst) { | |
1092 | if (dst->obsolete) { | |
1093 | dst_release(dst); | |
1094 | dst = NULL; | |
1095 | } | |
1096 | } | |
1097 | return dst; | |
1098 | } | |
1099 | ||
1100 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) | |
1101 | { | |
1102 | int i; | |
1103 | struct xfrm_policy *pol; | |
1104 | struct dst_entry *dst, **dstp, *gc_list = NULL; | |
1105 | ||
1106 | read_lock_bh(&xfrm_policy_lock); | |
1107 | for (i=0; i<2*XFRM_POLICY_MAX; i++) { | |
1108 | for (pol = xfrm_policy_list[i]; pol; pol = pol->next) { | |
1109 | write_lock(&pol->lock); | |
1110 | dstp = &pol->bundles; | |
1111 | while ((dst=*dstp) != NULL) { | |
1112 | if (func(dst)) { | |
1113 | *dstp = dst->next; | |
1114 | dst->next = gc_list; | |
1115 | gc_list = dst; | |
1116 | } else { | |
1117 | dstp = &dst->next; | |
1118 | } | |
1119 | } | |
1120 | write_unlock(&pol->lock); | |
1121 | } | |
1122 | } | |
1123 | read_unlock_bh(&xfrm_policy_lock); | |
1124 | ||
1125 | while (gc_list) { | |
1126 | dst = gc_list; | |
1127 | gc_list = dst->next; | |
1128 | dst_free(dst); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static int unused_bundle(struct dst_entry *dst) | |
1133 | { | |
1134 | return !atomic_read(&dst->__refcnt); | |
1135 | } | |
1136 | ||
1137 | static void __xfrm_garbage_collect(void) | |
1138 | { | |
1139 | xfrm_prune_bundles(unused_bundle); | |
1140 | } | |
1141 | ||
1142 | int xfrm_flush_bundles(void) | |
1143 | { | |
1144 | xfrm_prune_bundles(stale_bundle); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
399c180a DM |
1148 | static int always_true(struct dst_entry *dst) |
1149 | { | |
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | void xfrm_flush_all_bundles(void) | |
1154 | { | |
1155 | xfrm_prune_bundles(always_true); | |
1156 | } | |
1157 | ||
1da177e4 LT |
1158 | void xfrm_init_pmtu(struct dst_entry *dst) |
1159 | { | |
1160 | do { | |
1161 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1162 | u32 pmtu, route_mtu_cached; | |
1163 | ||
1164 | pmtu = dst_mtu(dst->child); | |
1165 | xdst->child_mtu_cached = pmtu; | |
1166 | ||
1167 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1168 | ||
1169 | route_mtu_cached = dst_mtu(xdst->route); | |
1170 | xdst->route_mtu_cached = route_mtu_cached; | |
1171 | ||
1172 | if (pmtu > route_mtu_cached) | |
1173 | pmtu = route_mtu_cached; | |
1174 | ||
1175 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1176 | } while ((dst = dst->next)); | |
1177 | } | |
1178 | ||
1179 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1180 | ||
1181 | /* Check that the bundle accepts the flow and its components are | |
1182 | * still valid. | |
1183 | */ | |
1184 | ||
1185 | int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family) | |
1186 | { | |
1187 | struct dst_entry *dst = &first->u.dst; | |
1188 | struct xfrm_dst *last; | |
1189 | u32 mtu; | |
1190 | ||
92d63dec | 1191 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1192 | (dst->dev && !netif_running(dst->dev))) |
1193 | return 0; | |
1194 | ||
1195 | last = NULL; | |
1196 | ||
1197 | do { | |
1198 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1199 | ||
1200 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1201 | return 0; | |
1202 | if (dst->xfrm->km.state != XFRM_STATE_VALID) | |
1203 | return 0; | |
1204 | ||
1205 | mtu = dst_mtu(dst->child); | |
1206 | if (xdst->child_mtu_cached != mtu) { | |
1207 | last = xdst; | |
1208 | xdst->child_mtu_cached = mtu; | |
1209 | } | |
1210 | ||
92d63dec | 1211 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1212 | return 0; |
1213 | mtu = dst_mtu(xdst->route); | |
1214 | if (xdst->route_mtu_cached != mtu) { | |
1215 | last = xdst; | |
1216 | xdst->route_mtu_cached = mtu; | |
1217 | } | |
1218 | ||
1219 | dst = dst->child; | |
1220 | } while (dst->xfrm); | |
1221 | ||
1222 | if (likely(!last)) | |
1223 | return 1; | |
1224 | ||
1225 | mtu = last->child_mtu_cached; | |
1226 | for (;;) { | |
1227 | dst = &last->u.dst; | |
1228 | ||
1229 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1230 | if (mtu > last->route_mtu_cached) | |
1231 | mtu = last->route_mtu_cached; | |
1232 | dst->metrics[RTAX_MTU-1] = mtu; | |
1233 | ||
1234 | if (last == first) | |
1235 | break; | |
1236 | ||
1237 | last = last->u.next; | |
1238 | last->child_mtu_cached = mtu; | |
1239 | } | |
1240 | ||
1241 | return 1; | |
1242 | } | |
1243 | ||
1244 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
1245 | ||
1da177e4 LT |
1246 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
1247 | { | |
1248 | int err = 0; | |
1249 | if (unlikely(afinfo == NULL)) | |
1250 | return -EINVAL; | |
1251 | if (unlikely(afinfo->family >= NPROTO)) | |
1252 | return -EAFNOSUPPORT; | |
1253 | write_lock(&xfrm_policy_afinfo_lock); | |
1254 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) | |
1255 | err = -ENOBUFS; | |
1256 | else { | |
1257 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1258 | if (likely(dst_ops->kmem_cachep == NULL)) | |
1259 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
1260 | if (likely(dst_ops->check == NULL)) | |
1261 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
1262 | if (likely(dst_ops->negative_advice == NULL)) |
1263 | dst_ops->negative_advice = xfrm_negative_advice; | |
1264 | if (likely(dst_ops->link_failure == NULL)) | |
1265 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
1266 | if (likely(afinfo->garbage_collect == NULL)) |
1267 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
1268 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
1269 | } | |
1270 | write_unlock(&xfrm_policy_afinfo_lock); | |
1271 | return err; | |
1272 | } | |
1273 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
1274 | ||
1275 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1276 | { | |
1277 | int err = 0; | |
1278 | if (unlikely(afinfo == NULL)) | |
1279 | return -EINVAL; | |
1280 | if (unlikely(afinfo->family >= NPROTO)) | |
1281 | return -EAFNOSUPPORT; | |
1282 | write_lock(&xfrm_policy_afinfo_lock); | |
1283 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { | |
1284 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
1285 | err = -EINVAL; | |
1286 | else { | |
1287 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1288 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
1289 | dst_ops->kmem_cachep = NULL; | |
1290 | dst_ops->check = NULL; | |
1da177e4 LT |
1291 | dst_ops->negative_advice = NULL; |
1292 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
1293 | afinfo->garbage_collect = NULL; |
1294 | } | |
1295 | } | |
1296 | write_unlock(&xfrm_policy_afinfo_lock); | |
1297 | return err; | |
1298 | } | |
1299 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
1300 | ||
1301 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
1302 | { | |
1303 | struct xfrm_policy_afinfo *afinfo; | |
1304 | if (unlikely(family >= NPROTO)) | |
1305 | return NULL; | |
1306 | read_lock(&xfrm_policy_afinfo_lock); | |
1307 | afinfo = xfrm_policy_afinfo[family]; | |
1308 | if (likely(afinfo != NULL)) | |
1309 | read_lock(&afinfo->lock); | |
1310 | read_unlock(&xfrm_policy_afinfo_lock); | |
1311 | return afinfo; | |
1312 | } | |
1313 | ||
1314 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1315 | { | |
1316 | if (unlikely(afinfo == NULL)) | |
1317 | return; | |
1318 | read_unlock(&afinfo->lock); | |
1319 | } | |
1320 | ||
1321 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1322 | { | |
1323 | switch (event) { | |
1324 | case NETDEV_DOWN: | |
1325 | xfrm_flush_bundles(); | |
1326 | } | |
1327 | return NOTIFY_DONE; | |
1328 | } | |
1329 | ||
1330 | static struct notifier_block xfrm_dev_notifier = { | |
1331 | xfrm_dev_event, | |
1332 | NULL, | |
1333 | 0 | |
1334 | }; | |
1335 | ||
1336 | static void __init xfrm_policy_init(void) | |
1337 | { | |
1338 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1339 | sizeof(struct xfrm_dst), | |
1340 | 0, SLAB_HWCACHE_ALIGN, | |
1341 | NULL, NULL); | |
1342 | if (!xfrm_dst_cache) | |
1343 | panic("XFRM: failed to allocate xfrm_dst_cache\n"); | |
1344 | ||
1345 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL); | |
1346 | register_netdevice_notifier(&xfrm_dev_notifier); | |
1347 | } | |
1348 | ||
1349 | void __init xfrm_init(void) | |
1350 | { | |
1351 | xfrm_state_init(); | |
1352 | xfrm_policy_init(); | |
1353 | xfrm_input_init(); | |
1354 | } | |
1355 |