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 | ||
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> | |
eb9c7ebe | 25 | #include <linux/netfilter.h> |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <net/xfrm.h> | |
28 | #include <net/ip.h> | |
29 | ||
30 | DECLARE_MUTEX(xfrm_cfg_sem); | |
31 | EXPORT_SYMBOL(xfrm_cfg_sem); | |
32 | ||
33 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
34 | ||
35 | struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
36 | EXPORT_SYMBOL(xfrm_policy_list); | |
37 | ||
38 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
39 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
40 | ||
ba89966c | 41 | static kmem_cache_t *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
42 | |
43 | static struct work_struct xfrm_policy_gc_work; | |
44 | static struct list_head xfrm_policy_gc_list = | |
45 | LIST_HEAD_INIT(xfrm_policy_gc_list); | |
46 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); | |
47 | ||
48 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
49 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
50 | ||
51 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) | |
52 | { | |
53 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
54 | struct xfrm_type_map *typemap; | |
55 | int err = 0; | |
56 | ||
57 | if (unlikely(afinfo == NULL)) | |
58 | return -EAFNOSUPPORT; | |
59 | typemap = afinfo->type_map; | |
60 | ||
61 | write_lock(&typemap->lock); | |
62 | if (likely(typemap->map[type->proto] == NULL)) | |
63 | typemap->map[type->proto] = type; | |
64 | else | |
65 | err = -EEXIST; | |
66 | write_unlock(&typemap->lock); | |
67 | xfrm_policy_put_afinfo(afinfo); | |
68 | return err; | |
69 | } | |
70 | EXPORT_SYMBOL(xfrm_register_type); | |
71 | ||
72 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
73 | { | |
74 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
75 | struct xfrm_type_map *typemap; | |
76 | int err = 0; | |
77 | ||
78 | if (unlikely(afinfo == NULL)) | |
79 | return -EAFNOSUPPORT; | |
80 | typemap = afinfo->type_map; | |
81 | ||
82 | write_lock(&typemap->lock); | |
83 | if (unlikely(typemap->map[type->proto] != type)) | |
84 | err = -ENOENT; | |
85 | else | |
86 | typemap->map[type->proto] = NULL; | |
87 | write_unlock(&typemap->lock); | |
88 | xfrm_policy_put_afinfo(afinfo); | |
89 | return err; | |
90 | } | |
91 | EXPORT_SYMBOL(xfrm_unregister_type); | |
92 | ||
93 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
94 | { | |
95 | struct xfrm_policy_afinfo *afinfo; | |
96 | struct xfrm_type_map *typemap; | |
97 | struct xfrm_type *type; | |
98 | int modload_attempted = 0; | |
99 | ||
100 | retry: | |
101 | afinfo = xfrm_policy_get_afinfo(family); | |
102 | if (unlikely(afinfo == NULL)) | |
103 | return NULL; | |
104 | typemap = afinfo->type_map; | |
105 | ||
106 | read_lock(&typemap->lock); | |
107 | type = typemap->map[proto]; | |
108 | if (unlikely(type && !try_module_get(type->owner))) | |
109 | type = NULL; | |
110 | read_unlock(&typemap->lock); | |
111 | if (!type && !modload_attempted) { | |
112 | xfrm_policy_put_afinfo(afinfo); | |
113 | request_module("xfrm-type-%d-%d", | |
114 | (int) family, (int) proto); | |
115 | modload_attempted = 1; | |
116 | goto retry; | |
117 | } | |
118 | ||
119 | xfrm_policy_put_afinfo(afinfo); | |
120 | return type; | |
121 | } | |
1da177e4 LT |
122 | |
123 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, | |
124 | unsigned short family) | |
125 | { | |
126 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
127 | int err = 0; | |
128 | ||
129 | if (unlikely(afinfo == NULL)) | |
130 | return -EAFNOSUPPORT; | |
131 | ||
132 | if (likely(afinfo->dst_lookup != NULL)) | |
133 | err = afinfo->dst_lookup(dst, fl); | |
134 | else | |
135 | err = -EINVAL; | |
136 | xfrm_policy_put_afinfo(afinfo); | |
137 | return err; | |
138 | } | |
139 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
140 | ||
141 | void xfrm_put_type(struct xfrm_type *type) | |
142 | { | |
143 | module_put(type->owner); | |
144 | } | |
145 | ||
146 | static inline unsigned long make_jiffies(long secs) | |
147 | { | |
148 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
149 | return MAX_SCHEDULE_TIMEOUT-1; | |
150 | else | |
151 | return secs*HZ; | |
152 | } | |
153 | ||
154 | static void xfrm_policy_timer(unsigned long data) | |
155 | { | |
156 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
157 | unsigned long now = (unsigned long)xtime.tv_sec; | |
158 | long next = LONG_MAX; | |
159 | int warn = 0; | |
160 | int dir; | |
161 | ||
162 | read_lock(&xp->lock); | |
163 | ||
164 | if (xp->dead) | |
165 | goto out; | |
166 | ||
77d8d7a6 | 167 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
168 | |
169 | if (xp->lft.hard_add_expires_seconds) { | |
170 | long tmo = xp->lft.hard_add_expires_seconds + | |
171 | xp->curlft.add_time - now; | |
172 | if (tmo <= 0) | |
173 | goto expired; | |
174 | if (tmo < next) | |
175 | next = tmo; | |
176 | } | |
177 | if (xp->lft.hard_use_expires_seconds) { | |
178 | long tmo = xp->lft.hard_use_expires_seconds + | |
179 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
180 | if (tmo <= 0) | |
181 | goto expired; | |
182 | if (tmo < next) | |
183 | next = tmo; | |
184 | } | |
185 | if (xp->lft.soft_add_expires_seconds) { | |
186 | long tmo = xp->lft.soft_add_expires_seconds + | |
187 | xp->curlft.add_time - now; | |
188 | if (tmo <= 0) { | |
189 | warn = 1; | |
190 | tmo = XFRM_KM_TIMEOUT; | |
191 | } | |
192 | if (tmo < next) | |
193 | next = tmo; | |
194 | } | |
195 | if (xp->lft.soft_use_expires_seconds) { | |
196 | long tmo = xp->lft.soft_use_expires_seconds + | |
197 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
198 | if (tmo <= 0) { | |
199 | warn = 1; | |
200 | tmo = XFRM_KM_TIMEOUT; | |
201 | } | |
202 | if (tmo < next) | |
203 | next = tmo; | |
204 | } | |
205 | ||
206 | if (warn) | |
207 | km_policy_expired(xp, dir, 0); | |
208 | if (next != LONG_MAX && | |
209 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
210 | xfrm_pol_hold(xp); | |
211 | ||
212 | out: | |
213 | read_unlock(&xp->lock); | |
214 | xfrm_pol_put(xp); | |
215 | return; | |
216 | ||
217 | expired: | |
218 | read_unlock(&xp->lock); | |
4666faab HX |
219 | if (!xfrm_policy_delete(xp, dir)) |
220 | km_policy_expired(xp, dir, 1); | |
1da177e4 LT |
221 | xfrm_pol_put(xp); |
222 | } | |
223 | ||
224 | ||
225 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
226 | * SPD calls. | |
227 | */ | |
228 | ||
dd0fc66f | 229 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
230 | { |
231 | struct xfrm_policy *policy; | |
232 | ||
233 | policy = kmalloc(sizeof(struct xfrm_policy), gfp); | |
234 | ||
235 | if (policy) { | |
236 | memset(policy, 0, sizeof(struct xfrm_policy)); | |
237 | atomic_set(&policy->refcnt, 1); | |
238 | rwlock_init(&policy->lock); | |
239 | init_timer(&policy->timer); | |
240 | policy->timer.data = (unsigned long)policy; | |
241 | policy->timer.function = xfrm_policy_timer; | |
242 | } | |
243 | return policy; | |
244 | } | |
245 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
246 | ||
247 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
248 | ||
249 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
250 | { | |
251 | if (!policy->dead) | |
252 | BUG(); | |
253 | ||
254 | if (policy->bundles) | |
255 | BUG(); | |
256 | ||
257 | if (del_timer(&policy->timer)) | |
258 | BUG(); | |
259 | ||
df71837d | 260 | security_xfrm_policy_free(policy); |
1da177e4 LT |
261 | kfree(policy); |
262 | } | |
263 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
264 | ||
265 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
266 | { | |
267 | struct dst_entry *dst; | |
268 | ||
269 | while ((dst = policy->bundles) != NULL) { | |
270 | policy->bundles = dst->next; | |
271 | dst_free(dst); | |
272 | } | |
273 | ||
274 | if (del_timer(&policy->timer)) | |
275 | atomic_dec(&policy->refcnt); | |
276 | ||
277 | if (atomic_read(&policy->refcnt) > 1) | |
278 | flow_cache_flush(); | |
279 | ||
280 | xfrm_pol_put(policy); | |
281 | } | |
282 | ||
283 | static void xfrm_policy_gc_task(void *data) | |
284 | { | |
285 | struct xfrm_policy *policy; | |
286 | struct list_head *entry, *tmp; | |
287 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); | |
288 | ||
289 | spin_lock_bh(&xfrm_policy_gc_lock); | |
290 | list_splice_init(&xfrm_policy_gc_list, &gc_list); | |
291 | spin_unlock_bh(&xfrm_policy_gc_lock); | |
292 | ||
293 | list_for_each_safe(entry, tmp, &gc_list) { | |
294 | policy = list_entry(entry, struct xfrm_policy, list); | |
295 | xfrm_policy_gc_kill(policy); | |
296 | } | |
297 | } | |
298 | ||
299 | /* Rule must be locked. Release descentant resources, announce | |
300 | * entry dead. The rule must be unlinked from lists to the moment. | |
301 | */ | |
302 | ||
303 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
304 | { | |
305 | int dead; | |
306 | ||
307 | write_lock_bh(&policy->lock); | |
308 | dead = policy->dead; | |
309 | policy->dead = 1; | |
310 | write_unlock_bh(&policy->lock); | |
311 | ||
312 | if (unlikely(dead)) { | |
313 | WARN_ON(1); | |
314 | return; | |
315 | } | |
316 | ||
317 | spin_lock(&xfrm_policy_gc_lock); | |
318 | list_add(&policy->list, &xfrm_policy_gc_list); | |
319 | spin_unlock(&xfrm_policy_gc_lock); | |
320 | ||
321 | schedule_work(&xfrm_policy_gc_work); | |
322 | } | |
323 | ||
324 | /* Generate new index... KAME seems to generate them ordered by cost | |
325 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
326 | static u32 xfrm_gen_index(int dir) | |
327 | { | |
328 | u32 idx; | |
329 | struct xfrm_policy *p; | |
330 | static u32 idx_generator; | |
331 | ||
332 | for (;;) { | |
333 | idx = (idx_generator | dir); | |
334 | idx_generator += 8; | |
335 | if (idx == 0) | |
336 | idx = 8; | |
337 | for (p = xfrm_policy_list[dir]; p; p = p->next) { | |
338 | if (p->index == idx) | |
339 | break; | |
340 | } | |
341 | if (!p) | |
342 | return idx; | |
343 | } | |
344 | } | |
345 | ||
346 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) | |
347 | { | |
348 | struct xfrm_policy *pol, **p; | |
349 | struct xfrm_policy *delpol = NULL; | |
350 | struct xfrm_policy **newpos = NULL; | |
9b78a82c | 351 | struct dst_entry *gc_list; |
1da177e4 LT |
352 | |
353 | write_lock_bh(&xfrm_policy_lock); | |
354 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) { | |
df71837d TJ |
355 | if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 && |
356 | xfrm_sec_ctx_match(pol->security, policy->security)) { | |
1da177e4 LT |
357 | if (excl) { |
358 | write_unlock_bh(&xfrm_policy_lock); | |
359 | return -EEXIST; | |
360 | } | |
361 | *p = pol->next; | |
362 | delpol = pol; | |
363 | if (policy->priority > pol->priority) | |
364 | continue; | |
365 | } else if (policy->priority >= pol->priority) { | |
366 | p = &pol->next; | |
367 | continue; | |
368 | } | |
369 | if (!newpos) | |
370 | newpos = p; | |
371 | if (delpol) | |
372 | break; | |
373 | p = &pol->next; | |
374 | } | |
375 | if (newpos) | |
376 | p = newpos; | |
377 | xfrm_pol_hold(policy); | |
378 | policy->next = *p; | |
379 | *p = policy; | |
380 | atomic_inc(&flow_cache_genid); | |
381 | policy->index = delpol ? delpol->index : xfrm_gen_index(dir); | |
382 | policy->curlft.add_time = (unsigned long)xtime.tv_sec; | |
383 | policy->curlft.use_time = 0; | |
384 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
385 | xfrm_pol_hold(policy); | |
386 | write_unlock_bh(&xfrm_policy_lock); | |
387 | ||
9b78a82c | 388 | if (delpol) |
1da177e4 | 389 | xfrm_policy_kill(delpol); |
9b78a82c DM |
390 | |
391 | read_lock_bh(&xfrm_policy_lock); | |
392 | gc_list = NULL; | |
393 | for (policy = policy->next; policy; policy = policy->next) { | |
394 | struct dst_entry *dst; | |
395 | ||
396 | write_lock(&policy->lock); | |
397 | dst = policy->bundles; | |
398 | if (dst) { | |
399 | struct dst_entry *tail = dst; | |
400 | while (tail->next) | |
401 | tail = tail->next; | |
402 | tail->next = gc_list; | |
403 | gc_list = dst; | |
404 | ||
405 | policy->bundles = NULL; | |
406 | } | |
407 | write_unlock(&policy->lock); | |
1da177e4 | 408 | } |
9b78a82c DM |
409 | read_unlock_bh(&xfrm_policy_lock); |
410 | ||
411 | while (gc_list) { | |
412 | struct dst_entry *dst = gc_list; | |
413 | ||
414 | gc_list = dst->next; | |
415 | dst_free(dst); | |
416 | } | |
417 | ||
1da177e4 LT |
418 | return 0; |
419 | } | |
420 | EXPORT_SYMBOL(xfrm_policy_insert); | |
421 | ||
df71837d TJ |
422 | struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, |
423 | struct xfrm_sec_ctx *ctx, int delete) | |
1da177e4 LT |
424 | { |
425 | struct xfrm_policy *pol, **p; | |
426 | ||
427 | write_lock_bh(&xfrm_policy_lock); | |
428 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) { | |
df71837d TJ |
429 | if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) && |
430 | (xfrm_sec_ctx_match(ctx, pol->security))) { | |
1da177e4 LT |
431 | xfrm_pol_hold(pol); |
432 | if (delete) | |
433 | *p = pol->next; | |
434 | break; | |
435 | } | |
436 | } | |
437 | write_unlock_bh(&xfrm_policy_lock); | |
438 | ||
439 | if (pol && delete) { | |
440 | atomic_inc(&flow_cache_genid); | |
441 | xfrm_policy_kill(pol); | |
442 | } | |
443 | return pol; | |
444 | } | |
df71837d | 445 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 LT |
446 | |
447 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete) | |
448 | { | |
449 | struct xfrm_policy *pol, **p; | |
450 | ||
451 | write_lock_bh(&xfrm_policy_lock); | |
77d8d7a6 | 452 | for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) { |
1da177e4 LT |
453 | if (pol->index == id) { |
454 | xfrm_pol_hold(pol); | |
455 | if (delete) | |
456 | *p = pol->next; | |
457 | break; | |
458 | } | |
459 | } | |
460 | write_unlock_bh(&xfrm_policy_lock); | |
461 | ||
462 | if (pol && delete) { | |
463 | atomic_inc(&flow_cache_genid); | |
464 | xfrm_policy_kill(pol); | |
465 | } | |
466 | return pol; | |
467 | } | |
468 | EXPORT_SYMBOL(xfrm_policy_byid); | |
469 | ||
470 | void xfrm_policy_flush(void) | |
471 | { | |
472 | struct xfrm_policy *xp; | |
473 | int dir; | |
474 | ||
475 | write_lock_bh(&xfrm_policy_lock); | |
476 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
477 | while ((xp = xfrm_policy_list[dir]) != NULL) { | |
478 | xfrm_policy_list[dir] = xp->next; | |
479 | write_unlock_bh(&xfrm_policy_lock); | |
480 | ||
481 | xfrm_policy_kill(xp); | |
482 | ||
483 | write_lock_bh(&xfrm_policy_lock); | |
484 | } | |
485 | } | |
486 | atomic_inc(&flow_cache_genid); | |
487 | write_unlock_bh(&xfrm_policy_lock); | |
488 | } | |
489 | EXPORT_SYMBOL(xfrm_policy_flush); | |
490 | ||
491 | int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), | |
492 | void *data) | |
493 | { | |
494 | struct xfrm_policy *xp; | |
495 | int dir; | |
496 | int count = 0; | |
497 | int error = 0; | |
498 | ||
499 | read_lock_bh(&xfrm_policy_lock); | |
500 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
501 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) | |
502 | count++; | |
503 | } | |
504 | ||
505 | if (count == 0) { | |
506 | error = -ENOENT; | |
507 | goto out; | |
508 | } | |
509 | ||
510 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
511 | for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) { | |
512 | error = func(xp, dir%XFRM_POLICY_MAX, --count, data); | |
513 | if (error) | |
514 | goto out; | |
515 | } | |
516 | } | |
517 | ||
518 | out: | |
519 | read_unlock_bh(&xfrm_policy_lock); | |
520 | return error; | |
521 | } | |
522 | EXPORT_SYMBOL(xfrm_policy_walk); | |
523 | ||
524 | /* Find policy to apply to this flow. */ | |
525 | ||
df71837d | 526 | static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir, |
1da177e4 LT |
527 | void **objp, atomic_t **obj_refp) |
528 | { | |
529 | struct xfrm_policy *pol; | |
530 | ||
531 | read_lock_bh(&xfrm_policy_lock); | |
532 | for (pol = xfrm_policy_list[dir]; pol; pol = pol->next) { | |
533 | struct xfrm_selector *sel = &pol->selector; | |
534 | int match; | |
535 | ||
536 | if (pol->family != family) | |
537 | continue; | |
538 | ||
539 | match = xfrm_selector_match(sel, fl, family); | |
df71837d | 540 | |
1da177e4 | 541 | if (match) { |
df71837d TJ |
542 | if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) { |
543 | xfrm_pol_hold(pol); | |
544 | break; | |
545 | } | |
1da177e4 LT |
546 | } |
547 | } | |
548 | read_unlock_bh(&xfrm_policy_lock); | |
549 | if ((*objp = (void *) pol) != NULL) | |
550 | *obj_refp = &pol->refcnt; | |
551 | } | |
552 | ||
df71837d TJ |
553 | static inline int policy_to_flow_dir(int dir) |
554 | { | |
555 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
556 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
557 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
558 | return dir; | |
559 | switch (dir) { | |
560 | default: | |
561 | case XFRM_POLICY_IN: | |
562 | return FLOW_DIR_IN; | |
563 | case XFRM_POLICY_OUT: | |
564 | return FLOW_DIR_OUT; | |
565 | case XFRM_POLICY_FWD: | |
566 | return FLOW_DIR_FWD; | |
567 | }; | |
568 | } | |
569 | ||
570 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid) | |
1da177e4 LT |
571 | { |
572 | struct xfrm_policy *pol; | |
573 | ||
574 | read_lock_bh(&xfrm_policy_lock); | |
575 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
df71837d | 576 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 577 | sk->sk_family); |
df71837d TJ |
578 | int err = 0; |
579 | ||
1da177e4 | 580 | if (match) |
df71837d TJ |
581 | err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir)); |
582 | ||
583 | if (match && !err) | |
1da177e4 LT |
584 | xfrm_pol_hold(pol); |
585 | else | |
586 | pol = NULL; | |
587 | } | |
588 | read_unlock_bh(&xfrm_policy_lock); | |
589 | return pol; | |
590 | } | |
591 | ||
592 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
593 | { | |
594 | pol->next = xfrm_policy_list[dir]; | |
595 | xfrm_policy_list[dir] = pol; | |
596 | xfrm_pol_hold(pol); | |
597 | } | |
598 | ||
599 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
600 | int dir) | |
601 | { | |
602 | struct xfrm_policy **polp; | |
603 | ||
604 | for (polp = &xfrm_policy_list[dir]; | |
605 | *polp != NULL; polp = &(*polp)->next) { | |
606 | if (*polp == pol) { | |
607 | *polp = pol->next; | |
608 | return pol; | |
609 | } | |
610 | } | |
611 | return NULL; | |
612 | } | |
613 | ||
4666faab | 614 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
615 | { |
616 | write_lock_bh(&xfrm_policy_lock); | |
617 | pol = __xfrm_policy_unlink(pol, dir); | |
618 | write_unlock_bh(&xfrm_policy_lock); | |
619 | if (pol) { | |
620 | if (dir < XFRM_POLICY_MAX) | |
621 | atomic_inc(&flow_cache_genid); | |
622 | xfrm_policy_kill(pol); | |
4666faab | 623 | return 0; |
1da177e4 | 624 | } |
4666faab | 625 | return -ENOENT; |
1da177e4 LT |
626 | } |
627 | ||
628 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
629 | { | |
630 | struct xfrm_policy *old_pol; | |
631 | ||
632 | write_lock_bh(&xfrm_policy_lock); | |
633 | old_pol = sk->sk_policy[dir]; | |
634 | sk->sk_policy[dir] = pol; | |
635 | if (pol) { | |
636 | pol->curlft.add_time = (unsigned long)xtime.tv_sec; | |
637 | pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir); | |
638 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); | |
639 | } | |
640 | if (old_pol) | |
641 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
642 | write_unlock_bh(&xfrm_policy_lock); | |
643 | ||
644 | if (old_pol) { | |
645 | xfrm_policy_kill(old_pol); | |
646 | } | |
647 | return 0; | |
648 | } | |
649 | ||
650 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
651 | { | |
652 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
653 | ||
654 | if (newp) { | |
655 | newp->selector = old->selector; | |
df71837d TJ |
656 | if (security_xfrm_policy_clone(old, newp)) { |
657 | kfree(newp); | |
658 | return NULL; /* ENOMEM */ | |
659 | } | |
1da177e4 LT |
660 | newp->lft = old->lft; |
661 | newp->curlft = old->curlft; | |
662 | newp->action = old->action; | |
663 | newp->flags = old->flags; | |
664 | newp->xfrm_nr = old->xfrm_nr; | |
665 | newp->index = old->index; | |
666 | memcpy(newp->xfrm_vec, old->xfrm_vec, | |
667 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
668 | write_lock_bh(&xfrm_policy_lock); | |
669 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
670 | write_unlock_bh(&xfrm_policy_lock); | |
671 | xfrm_pol_put(newp); | |
672 | } | |
673 | return newp; | |
674 | } | |
675 | ||
676 | int __xfrm_sk_clone_policy(struct sock *sk) | |
677 | { | |
678 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
679 | *p1 = sk->sk_policy[1]; | |
680 | ||
681 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
682 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
683 | return -ENOMEM; | |
684 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
685 | return -ENOMEM; | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /* Resolve list of templates for the flow, given policy. */ | |
690 | ||
691 | static int | |
692 | xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl, | |
693 | struct xfrm_state **xfrm, | |
694 | unsigned short family) | |
695 | { | |
696 | int nx; | |
697 | int i, error; | |
698 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
699 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
700 | ||
701 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
702 | struct xfrm_state *x; | |
703 | xfrm_address_t *remote = daddr; | |
704 | xfrm_address_t *local = saddr; | |
705 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
706 | ||
707 | if (tmpl->mode) { | |
708 | remote = &tmpl->id.daddr; | |
709 | local = &tmpl->saddr; | |
710 | } | |
711 | ||
712 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
713 | ||
714 | if (x && x->km.state == XFRM_STATE_VALID) { | |
715 | xfrm[nx++] = x; | |
716 | daddr = remote; | |
717 | saddr = local; | |
718 | continue; | |
719 | } | |
720 | if (x) { | |
721 | error = (x->km.state == XFRM_STATE_ERROR ? | |
722 | -EINVAL : -EAGAIN); | |
723 | xfrm_state_put(x); | |
724 | } | |
725 | ||
726 | if (!tmpl->optional) | |
727 | goto fail; | |
728 | } | |
729 | return nx; | |
730 | ||
731 | fail: | |
732 | for (nx--; nx>=0; nx--) | |
733 | xfrm_state_put(xfrm[nx]); | |
734 | return error; | |
735 | } | |
736 | ||
737 | /* Check that the bundle accepts the flow and its components are | |
738 | * still valid. | |
739 | */ | |
740 | ||
741 | static struct dst_entry * | |
742 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
743 | { | |
744 | struct dst_entry *x; | |
745 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
746 | if (unlikely(afinfo == NULL)) | |
747 | return ERR_PTR(-EINVAL); | |
748 | x = afinfo->find_bundle(fl, policy); | |
749 | xfrm_policy_put_afinfo(afinfo); | |
750 | return x; | |
751 | } | |
752 | ||
753 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
754 | * all the metrics... Shortly, bundle a bundle. | |
755 | */ | |
756 | ||
757 | static int | |
758 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
759 | struct flowi *fl, struct dst_entry **dst_p, | |
760 | unsigned short family) | |
761 | { | |
762 | int err; | |
763 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
764 | if (unlikely(afinfo == NULL)) | |
765 | return -EINVAL; | |
766 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
767 | xfrm_policy_put_afinfo(afinfo); | |
768 | return err; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | |
772 | static int stale_bundle(struct dst_entry *dst); | |
773 | ||
774 | /* Main function: finds/creates a bundle for given flow. | |
775 | * | |
776 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
777 | * on interfaces with disabled IPsec. | |
778 | */ | |
779 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
780 | struct sock *sk, int flags) | |
781 | { | |
782 | struct xfrm_policy *policy; | |
783 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
784 | struct dst_entry *dst, *dst_orig = *dst_p; | |
785 | int nx = 0; | |
786 | int err; | |
787 | u32 genid; | |
788 | u16 family = dst_orig->ops->family; | |
df71837d TJ |
789 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
790 | u32 sk_sid = security_sk_sid(sk, fl, dir); | |
1da177e4 LT |
791 | restart: |
792 | genid = atomic_read(&flow_cache_genid); | |
793 | policy = NULL; | |
794 | if (sk && sk->sk_policy[1]) | |
df71837d | 795 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid); |
1da177e4 LT |
796 | |
797 | if (!policy) { | |
798 | /* To accelerate a bit... */ | |
799 | if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT]) | |
800 | return 0; | |
801 | ||
df71837d | 802 | policy = flow_cache_lookup(fl, sk_sid, family, dir, |
1da177e4 LT |
803 | xfrm_policy_lookup); |
804 | } | |
805 | ||
806 | if (!policy) | |
807 | return 0; | |
808 | ||
809 | policy->curlft.use_time = (unsigned long)xtime.tv_sec; | |
810 | ||
811 | switch (policy->action) { | |
812 | case XFRM_POLICY_BLOCK: | |
813 | /* Prohibit the flow */ | |
e104411b PM |
814 | err = -EPERM; |
815 | goto error; | |
1da177e4 LT |
816 | |
817 | case XFRM_POLICY_ALLOW: | |
818 | if (policy->xfrm_nr == 0) { | |
819 | /* Flow passes not transformed. */ | |
820 | xfrm_pol_put(policy); | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /* Try to find matching bundle. | |
825 | * | |
826 | * LATER: help from flow cache. It is optional, this | |
827 | * is required only for output policy. | |
828 | */ | |
829 | dst = xfrm_find_bundle(fl, policy, family); | |
830 | if (IS_ERR(dst)) { | |
e104411b PM |
831 | err = PTR_ERR(dst); |
832 | goto error; | |
1da177e4 LT |
833 | } |
834 | ||
835 | if (dst) | |
836 | break; | |
837 | ||
838 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
839 | ||
840 | if (unlikely(nx<0)) { | |
841 | err = nx; | |
842 | if (err == -EAGAIN && flags) { | |
843 | DECLARE_WAITQUEUE(wait, current); | |
844 | ||
845 | add_wait_queue(&km_waitq, &wait); | |
846 | set_current_state(TASK_INTERRUPTIBLE); | |
847 | schedule(); | |
848 | set_current_state(TASK_RUNNING); | |
849 | remove_wait_queue(&km_waitq, &wait); | |
850 | ||
851 | nx = xfrm_tmpl_resolve(policy, fl, xfrm, family); | |
852 | ||
853 | if (nx == -EAGAIN && signal_pending(current)) { | |
854 | err = -ERESTART; | |
855 | goto error; | |
856 | } | |
857 | if (nx == -EAGAIN || | |
858 | genid != atomic_read(&flow_cache_genid)) { | |
859 | xfrm_pol_put(policy); | |
860 | goto restart; | |
861 | } | |
862 | err = nx; | |
863 | } | |
864 | if (err < 0) | |
865 | goto error; | |
866 | } | |
867 | if (nx == 0) { | |
868 | /* Flow passes not transformed. */ | |
869 | xfrm_pol_put(policy); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | dst = dst_orig; | |
874 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
875 | ||
876 | if (unlikely(err)) { | |
877 | int i; | |
878 | for (i=0; i<nx; i++) | |
879 | xfrm_state_put(xfrm[i]); | |
880 | goto error; | |
881 | } | |
882 | ||
883 | write_lock_bh(&policy->lock); | |
884 | if (unlikely(policy->dead || stale_bundle(dst))) { | |
885 | /* Wow! While we worked on resolving, this | |
886 | * policy has gone. Retry. It is not paranoia, | |
887 | * we just cannot enlist new bundle to dead object. | |
888 | * We can't enlist stable bundles either. | |
889 | */ | |
890 | write_unlock_bh(&policy->lock); | |
891 | ||
892 | xfrm_pol_put(policy); | |
893 | if (dst) | |
894 | dst_free(dst); | |
895 | goto restart; | |
896 | } | |
897 | dst->next = policy->bundles; | |
898 | policy->bundles = dst; | |
899 | dst_hold(dst); | |
900 | write_unlock_bh(&policy->lock); | |
901 | } | |
902 | *dst_p = dst; | |
903 | dst_release(dst_orig); | |
904 | xfrm_pol_put(policy); | |
905 | return 0; | |
906 | ||
907 | error: | |
908 | dst_release(dst_orig); | |
909 | xfrm_pol_put(policy); | |
910 | *dst_p = NULL; | |
911 | return err; | |
912 | } | |
913 | EXPORT_SYMBOL(xfrm_lookup); | |
914 | ||
915 | /* When skb is transformed back to its "native" form, we have to | |
916 | * check policy restrictions. At the moment we make this in maximally | |
917 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
918 | * have policy cached at them. | |
919 | */ | |
920 | ||
921 | static inline int | |
922 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, | |
923 | unsigned short family) | |
924 | { | |
925 | if (xfrm_state_kern(x)) | |
926 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family); | |
927 | return x->id.proto == tmpl->id.proto && | |
928 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
929 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
930 | x->props.mode == tmpl->mode && | |
931 | (tmpl->aalgos & (1<<x->props.aalgo)) && | |
932 | !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family)); | |
933 | } | |
934 | ||
935 | static inline int | |
936 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
937 | unsigned short family) | |
938 | { | |
939 | int idx = start; | |
940 | ||
941 | if (tmpl->optional) { | |
942 | if (!tmpl->mode) | |
943 | return start; | |
944 | } else | |
945 | start = -1; | |
946 | for (; idx < sp->len; idx++) { | |
947 | if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family)) | |
948 | return ++idx; | |
949 | if (sp->x[idx].xvec->props.mode) | |
950 | break; | |
951 | } | |
952 | return start; | |
953 | } | |
954 | ||
3e3850e9 PM |
955 | int |
956 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
957 | { |
958 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
959 | ||
960 | if (unlikely(afinfo == NULL)) | |
961 | return -EAFNOSUPPORT; | |
962 | ||
963 | afinfo->decode_session(skb, fl); | |
964 | xfrm_policy_put_afinfo(afinfo); | |
965 | return 0; | |
966 | } | |
3e3850e9 | 967 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 LT |
968 | |
969 | static inline int secpath_has_tunnel(struct sec_path *sp, int k) | |
970 | { | |
971 | for (; k < sp->len; k++) { | |
972 | if (sp->x[k].xvec->props.mode) | |
973 | return 1; | |
974 | } | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, | |
980 | unsigned short family) | |
981 | { | |
982 | struct xfrm_policy *pol; | |
983 | struct flowi fl; | |
df71837d TJ |
984 | u8 fl_dir = policy_to_flow_dir(dir); |
985 | u32 sk_sid; | |
1da177e4 | 986 | |
3e3850e9 | 987 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 988 | return 0; |
eb9c7ebe | 989 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 | 990 | |
df71837d TJ |
991 | sk_sid = security_sk_sid(sk, &fl, fl_dir); |
992 | ||
1da177e4 LT |
993 | /* First, check used SA against their selectors. */ |
994 | if (skb->sp) { | |
995 | int i; | |
996 | ||
997 | for (i=skb->sp->len-1; i>=0; i--) { | |
df71837d | 998 | struct sec_decap_state *xvec = &(skb->sp->x[i]); |
1da177e4 LT |
999 | if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family)) |
1000 | return 0; | |
1001 | ||
1002 | /* If there is a post_input processor, try running it */ | |
1003 | if (xvec->xvec->type->post_input && | |
1004 | (xvec->xvec->type->post_input)(xvec->xvec, | |
1005 | &(xvec->decap), | |
1006 | skb) != 0) | |
1007 | return 0; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | pol = NULL; | |
1012 | if (sk && sk->sk_policy[dir]) | |
df71837d | 1013 | pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid); |
1da177e4 LT |
1014 | |
1015 | if (!pol) | |
df71837d | 1016 | pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir, |
1da177e4 LT |
1017 | xfrm_policy_lookup); |
1018 | ||
1019 | if (!pol) | |
1020 | return !skb->sp || !secpath_has_tunnel(skb->sp, 0); | |
1021 | ||
1022 | pol->curlft.use_time = (unsigned long)xtime.tv_sec; | |
1023 | ||
1024 | if (pol->action == XFRM_POLICY_ALLOW) { | |
1025 | struct sec_path *sp; | |
1026 | static struct sec_path dummy; | |
1027 | int i, k; | |
1028 | ||
1029 | if ((sp = skb->sp) == NULL) | |
1030 | sp = &dummy; | |
1031 | ||
1032 | /* For each tunnel xfrm, find the first matching tmpl. | |
1033 | * For each tmpl before that, find corresponding xfrm. | |
1034 | * Order is _important_. Later we will implement | |
1035 | * some barriers, but at the moment barriers | |
1036 | * are implied between each two transformations. | |
1037 | */ | |
1038 | for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) { | |
1039 | k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family); | |
1040 | if (k < 0) | |
1041 | goto reject; | |
1042 | } | |
1043 | ||
1044 | if (secpath_has_tunnel(sp, k)) | |
1045 | goto reject; | |
1046 | ||
1047 | xfrm_pol_put(pol); | |
1048 | return 1; | |
1049 | } | |
1050 | ||
1051 | reject: | |
1052 | xfrm_pol_put(pol); | |
1053 | return 0; | |
1054 | } | |
1055 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1056 | ||
1057 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1058 | { | |
1059 | struct flowi fl; | |
1060 | ||
3e3850e9 | 1061 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1062 | return 0; |
1063 | ||
1064 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1065 | } | |
1066 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1067 | ||
1da177e4 LT |
1068 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1069 | { | |
399c180a DM |
1070 | /* If it is marked obsolete, which is how we even get here, |
1071 | * then we have purged it from the policy bundle list and we | |
1072 | * did that for a good reason. | |
1073 | */ | |
1da177e4 LT |
1074 | return NULL; |
1075 | } | |
1076 | ||
1077 | static int stale_bundle(struct dst_entry *dst) | |
1078 | { | |
1079 | return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC); | |
1080 | } | |
1081 | ||
aabc9761 | 1082 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1083 | { |
1da177e4 LT |
1084 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1085 | dst->dev = &loopback_dev; | |
1086 | dev_hold(&loopback_dev); | |
1087 | dev_put(dev); | |
1088 | } | |
1089 | } | |
aabc9761 | 1090 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1091 | |
1092 | static void xfrm_link_failure(struct sk_buff *skb) | |
1093 | { | |
1094 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1099 | { | |
1100 | if (dst) { | |
1101 | if (dst->obsolete) { | |
1102 | dst_release(dst); | |
1103 | dst = NULL; | |
1104 | } | |
1105 | } | |
1106 | return dst; | |
1107 | } | |
1108 | ||
1109 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) | |
1110 | { | |
1111 | int i; | |
1112 | struct xfrm_policy *pol; | |
1113 | struct dst_entry *dst, **dstp, *gc_list = NULL; | |
1114 | ||
1115 | read_lock_bh(&xfrm_policy_lock); | |
1116 | for (i=0; i<2*XFRM_POLICY_MAX; i++) { | |
1117 | for (pol = xfrm_policy_list[i]; pol; pol = pol->next) { | |
1118 | write_lock(&pol->lock); | |
1119 | dstp = &pol->bundles; | |
1120 | while ((dst=*dstp) != NULL) { | |
1121 | if (func(dst)) { | |
1122 | *dstp = dst->next; | |
1123 | dst->next = gc_list; | |
1124 | gc_list = dst; | |
1125 | } else { | |
1126 | dstp = &dst->next; | |
1127 | } | |
1128 | } | |
1129 | write_unlock(&pol->lock); | |
1130 | } | |
1131 | } | |
1132 | read_unlock_bh(&xfrm_policy_lock); | |
1133 | ||
1134 | while (gc_list) { | |
1135 | dst = gc_list; | |
1136 | gc_list = dst->next; | |
1137 | dst_free(dst); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | static int unused_bundle(struct dst_entry *dst) | |
1142 | { | |
1143 | return !atomic_read(&dst->__refcnt); | |
1144 | } | |
1145 | ||
1146 | static void __xfrm_garbage_collect(void) | |
1147 | { | |
1148 | xfrm_prune_bundles(unused_bundle); | |
1149 | } | |
1150 | ||
1151 | int xfrm_flush_bundles(void) | |
1152 | { | |
1153 | xfrm_prune_bundles(stale_bundle); | |
1154 | return 0; | |
1155 | } | |
1156 | ||
399c180a DM |
1157 | static int always_true(struct dst_entry *dst) |
1158 | { | |
1159 | return 1; | |
1160 | } | |
1161 | ||
1162 | void xfrm_flush_all_bundles(void) | |
1163 | { | |
1164 | xfrm_prune_bundles(always_true); | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | void xfrm_init_pmtu(struct dst_entry *dst) |
1168 | { | |
1169 | do { | |
1170 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1171 | u32 pmtu, route_mtu_cached; | |
1172 | ||
1173 | pmtu = dst_mtu(dst->child); | |
1174 | xdst->child_mtu_cached = pmtu; | |
1175 | ||
1176 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1177 | ||
1178 | route_mtu_cached = dst_mtu(xdst->route); | |
1179 | xdst->route_mtu_cached = route_mtu_cached; | |
1180 | ||
1181 | if (pmtu > route_mtu_cached) | |
1182 | pmtu = route_mtu_cached; | |
1183 | ||
1184 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1185 | } while ((dst = dst->next)); | |
1186 | } | |
1187 | ||
1188 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1189 | ||
1190 | /* Check that the bundle accepts the flow and its components are | |
1191 | * still valid. | |
1192 | */ | |
1193 | ||
1194 | int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family) | |
1195 | { | |
1196 | struct dst_entry *dst = &first->u.dst; | |
1197 | struct xfrm_dst *last; | |
1198 | u32 mtu; | |
1199 | ||
92d63dec | 1200 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1201 | (dst->dev && !netif_running(dst->dev))) |
1202 | return 0; | |
1203 | ||
1204 | last = NULL; | |
1205 | ||
1206 | do { | |
1207 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1208 | ||
1209 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1210 | return 0; | |
1211 | if (dst->xfrm->km.state != XFRM_STATE_VALID) | |
1212 | return 0; | |
1213 | ||
1214 | mtu = dst_mtu(dst->child); | |
1215 | if (xdst->child_mtu_cached != mtu) { | |
1216 | last = xdst; | |
1217 | xdst->child_mtu_cached = mtu; | |
1218 | } | |
1219 | ||
92d63dec | 1220 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1221 | return 0; |
1222 | mtu = dst_mtu(xdst->route); | |
1223 | if (xdst->route_mtu_cached != mtu) { | |
1224 | last = xdst; | |
1225 | xdst->route_mtu_cached = mtu; | |
1226 | } | |
1227 | ||
1228 | dst = dst->child; | |
1229 | } while (dst->xfrm); | |
1230 | ||
1231 | if (likely(!last)) | |
1232 | return 1; | |
1233 | ||
1234 | mtu = last->child_mtu_cached; | |
1235 | for (;;) { | |
1236 | dst = &last->u.dst; | |
1237 | ||
1238 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1239 | if (mtu > last->route_mtu_cached) | |
1240 | mtu = last->route_mtu_cached; | |
1241 | dst->metrics[RTAX_MTU-1] = mtu; | |
1242 | ||
1243 | if (last == first) | |
1244 | break; | |
1245 | ||
1246 | last = last->u.next; | |
1247 | last->child_mtu_cached = mtu; | |
1248 | } | |
1249 | ||
1250 | return 1; | |
1251 | } | |
1252 | ||
1253 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
1254 | ||
1da177e4 LT |
1255 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
1256 | { | |
1257 | int err = 0; | |
1258 | if (unlikely(afinfo == NULL)) | |
1259 | return -EINVAL; | |
1260 | if (unlikely(afinfo->family >= NPROTO)) | |
1261 | return -EAFNOSUPPORT; | |
1262 | write_lock(&xfrm_policy_afinfo_lock); | |
1263 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) | |
1264 | err = -ENOBUFS; | |
1265 | else { | |
1266 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1267 | if (likely(dst_ops->kmem_cachep == NULL)) | |
1268 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
1269 | if (likely(dst_ops->check == NULL)) | |
1270 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
1271 | if (likely(dst_ops->negative_advice == NULL)) |
1272 | dst_ops->negative_advice = xfrm_negative_advice; | |
1273 | if (likely(dst_ops->link_failure == NULL)) | |
1274 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
1275 | if (likely(afinfo->garbage_collect == NULL)) |
1276 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
1277 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
1278 | } | |
1279 | write_unlock(&xfrm_policy_afinfo_lock); | |
1280 | return err; | |
1281 | } | |
1282 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
1283 | ||
1284 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1285 | { | |
1286 | int err = 0; | |
1287 | if (unlikely(afinfo == NULL)) | |
1288 | return -EINVAL; | |
1289 | if (unlikely(afinfo->family >= NPROTO)) | |
1290 | return -EAFNOSUPPORT; | |
1291 | write_lock(&xfrm_policy_afinfo_lock); | |
1292 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { | |
1293 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
1294 | err = -EINVAL; | |
1295 | else { | |
1296 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1297 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
1298 | dst_ops->kmem_cachep = NULL; | |
1299 | dst_ops->check = NULL; | |
1da177e4 LT |
1300 | dst_ops->negative_advice = NULL; |
1301 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
1302 | afinfo->garbage_collect = NULL; |
1303 | } | |
1304 | } | |
1305 | write_unlock(&xfrm_policy_afinfo_lock); | |
1306 | return err; | |
1307 | } | |
1308 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
1309 | ||
1310 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
1311 | { | |
1312 | struct xfrm_policy_afinfo *afinfo; | |
1313 | if (unlikely(family >= NPROTO)) | |
1314 | return NULL; | |
1315 | read_lock(&xfrm_policy_afinfo_lock); | |
1316 | afinfo = xfrm_policy_afinfo[family]; | |
1317 | if (likely(afinfo != NULL)) | |
1318 | read_lock(&afinfo->lock); | |
1319 | read_unlock(&xfrm_policy_afinfo_lock); | |
1320 | return afinfo; | |
1321 | } | |
1322 | ||
1323 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
1324 | { | |
1325 | if (unlikely(afinfo == NULL)) | |
1326 | return; | |
1327 | read_unlock(&afinfo->lock); | |
1328 | } | |
1329 | ||
1330 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1331 | { | |
1332 | switch (event) { | |
1333 | case NETDEV_DOWN: | |
1334 | xfrm_flush_bundles(); | |
1335 | } | |
1336 | return NOTIFY_DONE; | |
1337 | } | |
1338 | ||
1339 | static struct notifier_block xfrm_dev_notifier = { | |
1340 | xfrm_dev_event, | |
1341 | NULL, | |
1342 | 0 | |
1343 | }; | |
1344 | ||
1345 | static void __init xfrm_policy_init(void) | |
1346 | { | |
1347 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1348 | sizeof(struct xfrm_dst), | |
1349 | 0, SLAB_HWCACHE_ALIGN, | |
1350 | NULL, NULL); | |
1351 | if (!xfrm_dst_cache) | |
1352 | panic("XFRM: failed to allocate xfrm_dst_cache\n"); | |
1353 | ||
1354 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL); | |
1355 | register_netdevice_notifier(&xfrm_dev_notifier); | |
1356 | } | |
1357 | ||
1358 | void __init xfrm_init(void) | |
1359 | { | |
1360 | xfrm_state_init(); | |
1361 | xfrm_policy_init(); | |
1362 | xfrm_input_init(); | |
1363 | } | |
1364 |