blob: f5eae9febd26acbfca587264794011ef420a87e5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Trent Jaegerdf718372005-12-13 23:12:27 -080013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 */
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#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>
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -080024#include <linux/netfilter.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/module.h>
26#include <net/xfrm.h>
27#include <net/ip.h>
28
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080029DEFINE_MUTEX(xfrm_cfg_mutex);
30EXPORT_SYMBOL(xfrm_cfg_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32static DEFINE_RWLOCK(xfrm_policy_lock);
33
34struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
35EXPORT_SYMBOL(xfrm_policy_list);
36
37static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
38static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
39
Eric Dumazetba899662005-08-26 12:05:31 -070040static kmem_cache_t *xfrm_dst_cache __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42static struct work_struct xfrm_policy_gc_work;
43static struct list_head xfrm_policy_gc_list =
44 LIST_HEAD_INIT(xfrm_policy_gc_list);
45static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
46
47static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
48static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
49
50int 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}
69EXPORT_SYMBOL(xfrm_register_type);
70
71int 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}
90EXPORT_SYMBOL(xfrm_unregister_type);
91
92struct 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
99retry:
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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122int 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}
138EXPORT_SYMBOL(xfrm_dst_lookup);
139
140void xfrm_put_type(struct xfrm_type *type)
141{
142 module_put(type->owner);
143}
144
145static 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
153static 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
Herbert Xu77d8d7a2005-10-05 12:15:12 -0700166 dir = xfrm_policy_id2dir(xp->index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
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)
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800206 km_policy_expired(xp, dir, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (next != LONG_MAX &&
208 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
209 xfrm_pol_hold(xp);
210
211out:
212 read_unlock(&xp->lock);
213 xfrm_pol_put(xp);
214 return;
215
216expired:
217 read_unlock(&xp->lock);
Herbert Xu4666faa2005-06-18 22:43:22 -0700218 if (!xfrm_policy_delete(xp, dir))
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800219 km_policy_expired(xp, dir, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 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
Al Virodd0fc662005-10-07 07:46:04 +0100228struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
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}
244EXPORT_SYMBOL(xfrm_policy_alloc);
245
246/* Destroy xfrm_policy: descendant resources must be released to this moment. */
247
248void __xfrm_policy_destroy(struct xfrm_policy *policy)
249{
Kris Katterjohn09a62662006-01-08 22:24:28 -0800250 BUG_ON(!policy->dead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Kris Katterjohn09a62662006-01-08 22:24:28 -0800252 BUG_ON(policy->bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 if (del_timer(&policy->timer))
255 BUG();
256
Trent Jaegerdf718372005-12-13 23:12:27 -0800257 security_xfrm_policy_free(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 kfree(policy);
259}
260EXPORT_SYMBOL(__xfrm_policy_destroy);
261
262static 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
280static 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
300static 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. */
323static 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
343int 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;
David S. Miller9b78a822005-12-22 07:39:48 -0800348 struct dst_entry *gc_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 write_lock_bh(&xfrm_policy_lock);
351 for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) {
Trent Jaegerdf718372005-12-13 23:12:27 -0800352 if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 &&
353 xfrm_sec_ctx_match(pol->security, policy->security)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 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
David S. Miller9b78a822005-12-22 07:39:48 -0800385 if (delpol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 xfrm_policy_kill(delpol);
David S. Miller9b78a822005-12-22 07:39:48 -0800387
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
David S. Miller9b78a822005-12-22 07:39:48 -0800406 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return 0;
416}
417EXPORT_SYMBOL(xfrm_policy_insert);
418
Trent Jaegerdf718372005-12-13 23:12:27 -0800419struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
420 struct xfrm_sec_ctx *ctx, int delete)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
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) {
Trent Jaegerdf718372005-12-13 23:12:27 -0800426 if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) &&
427 (xfrm_sec_ctx_match(ctx, pol->security))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 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}
Trent Jaegerdf718372005-12-13 23:12:27 -0800442EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444struct 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);
Herbert Xu77d8d7a2005-10-05 12:15:12 -0700449 for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 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}
465EXPORT_SYMBOL(xfrm_policy_byid);
466
467void 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}
486EXPORT_SYMBOL(xfrm_policy_flush);
487
488int 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
515out:
516 read_unlock_bh(&xfrm_policy_lock);
517 return error;
518}
519EXPORT_SYMBOL(xfrm_policy_walk);
520
521/* Find policy to apply to this flow. */
522
Trent Jaegerdf718372005-12-13 23:12:27 -0800523static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 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);
Trent Jaegerdf718372005-12-13 23:12:27 -0800537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (match) {
Trent Jaegerdf718372005-12-13 23:12:27 -0800539 if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) {
540 xfrm_pol_hold(pol);
541 break;
542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
544 }
545 read_unlock_bh(&xfrm_policy_lock);
546 if ((*objp = (void *) pol) != NULL)
547 *obj_refp = &pol->refcnt;
548}
549
Trent Jaegerdf718372005-12-13 23:12:27 -0800550static 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
567static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
569 struct xfrm_policy *pol;
570
571 read_lock_bh(&xfrm_policy_lock);
572 if ((pol = sk->sk_policy[dir]) != NULL) {
Trent Jaegerdf718372005-12-13 23:12:27 -0800573 int match = xfrm_selector_match(&pol->selector, fl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 sk->sk_family);
Trent Jaegerdf718372005-12-13 23:12:27 -0800575 int err = 0;
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (match)
Trent Jaegerdf718372005-12-13 23:12:27 -0800578 err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir));
579
580 if (match && !err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 xfrm_pol_hold(pol);
582 else
583 pol = NULL;
584 }
585 read_unlock_bh(&xfrm_policy_lock);
586 return pol;
587}
588
589static 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
596static 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
Herbert Xu4666faa2005-06-18 22:43:22 -0700611int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
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);
Herbert Xu4666faa2005-06-18 22:43:22 -0700620 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
Herbert Xu4666faa2005-06-18 22:43:22 -0700622 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623}
David S. Millera70fcb02006-03-20 19:18:52 -0800624EXPORT_SYMBOL(xfrm_policy_delete);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
627{
628 struct xfrm_policy *old_pol;
629
630 write_lock_bh(&xfrm_policy_lock);
631 old_pol = sk->sk_policy[dir];
632 sk->sk_policy[dir] = pol;
633 if (pol) {
634 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
635 pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir);
636 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
637 }
638 if (old_pol)
639 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
640 write_unlock_bh(&xfrm_policy_lock);
641
642 if (old_pol) {
643 xfrm_policy_kill(old_pol);
644 }
645 return 0;
646}
647
648static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
649{
650 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
651
652 if (newp) {
653 newp->selector = old->selector;
Trent Jaegerdf718372005-12-13 23:12:27 -0800654 if (security_xfrm_policy_clone(old, newp)) {
655 kfree(newp);
656 return NULL; /* ENOMEM */
657 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 newp->lft = old->lft;
659 newp->curlft = old->curlft;
660 newp->action = old->action;
661 newp->flags = old->flags;
662 newp->xfrm_nr = old->xfrm_nr;
663 newp->index = old->index;
664 memcpy(newp->xfrm_vec, old->xfrm_vec,
665 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
666 write_lock_bh(&xfrm_policy_lock);
667 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
668 write_unlock_bh(&xfrm_policy_lock);
669 xfrm_pol_put(newp);
670 }
671 return newp;
672}
673
674int __xfrm_sk_clone_policy(struct sock *sk)
675{
676 struct xfrm_policy *p0 = sk->sk_policy[0],
677 *p1 = sk->sk_policy[1];
678
679 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
680 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
681 return -ENOMEM;
682 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
683 return -ENOMEM;
684 return 0;
685}
686
687/* Resolve list of templates for the flow, given policy. */
688
689static int
690xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl,
691 struct xfrm_state **xfrm,
692 unsigned short family)
693{
694 int nx;
695 int i, error;
696 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
697 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
698
699 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
700 struct xfrm_state *x;
701 xfrm_address_t *remote = daddr;
702 xfrm_address_t *local = saddr;
703 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
704
705 if (tmpl->mode) {
706 remote = &tmpl->id.daddr;
707 local = &tmpl->saddr;
708 }
709
710 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
711
712 if (x && x->km.state == XFRM_STATE_VALID) {
713 xfrm[nx++] = x;
714 daddr = remote;
715 saddr = local;
716 continue;
717 }
718 if (x) {
719 error = (x->km.state == XFRM_STATE_ERROR ?
720 -EINVAL : -EAGAIN);
721 xfrm_state_put(x);
722 }
723
724 if (!tmpl->optional)
725 goto fail;
726 }
727 return nx;
728
729fail:
730 for (nx--; nx>=0; nx--)
731 xfrm_state_put(xfrm[nx]);
732 return error;
733}
734
735/* Check that the bundle accepts the flow and its components are
736 * still valid.
737 */
738
739static struct dst_entry *
740xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
741{
742 struct dst_entry *x;
743 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
744 if (unlikely(afinfo == NULL))
745 return ERR_PTR(-EINVAL);
746 x = afinfo->find_bundle(fl, policy);
747 xfrm_policy_put_afinfo(afinfo);
748 return x;
749}
750
751/* Allocate chain of dst_entry's, attach known xfrm's, calculate
752 * all the metrics... Shortly, bundle a bundle.
753 */
754
755static int
756xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
757 struct flowi *fl, struct dst_entry **dst_p,
758 unsigned short family)
759{
760 int err;
761 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
762 if (unlikely(afinfo == NULL))
763 return -EINVAL;
764 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
765 xfrm_policy_put_afinfo(afinfo);
766 return err;
767}
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770static int stale_bundle(struct dst_entry *dst);
771
772/* Main function: finds/creates a bundle for given flow.
773 *
774 * At the moment we eat a raw IP route. Mostly to speed up lookups
775 * on interfaces with disabled IPsec.
776 */
777int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
778 struct sock *sk, int flags)
779{
780 struct xfrm_policy *policy;
781 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
782 struct dst_entry *dst, *dst_orig = *dst_p;
783 int nx = 0;
784 int err;
785 u32 genid;
Patrick McHardy42cf93c2006-02-21 13:37:35 -0800786 u16 family;
Trent Jaegerdf718372005-12-13 23:12:27 -0800787 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
788 u32 sk_sid = security_sk_sid(sk, fl, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789restart:
790 genid = atomic_read(&flow_cache_genid);
791 policy = NULL;
792 if (sk && sk->sk_policy[1])
Trent Jaegerdf718372005-12-13 23:12:27 -0800793 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 if (!policy) {
796 /* To accelerate a bit... */
797 if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT])
798 return 0;
799
Patrick McHardy42cf93c2006-02-21 13:37:35 -0800800 policy = flow_cache_lookup(fl, sk_sid, dst_orig->ops->family,
801 dir, xfrm_policy_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 }
803
804 if (!policy)
805 return 0;
806
Patrick McHardy42cf93c2006-02-21 13:37:35 -0800807 family = dst_orig->ops->family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 policy->curlft.use_time = (unsigned long)xtime.tv_sec;
809
810 switch (policy->action) {
811 case XFRM_POLICY_BLOCK:
812 /* Prohibit the flow */
Patrick McHardye104411b2005-09-08 15:11:55 -0700813 err = -EPERM;
814 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
816 case XFRM_POLICY_ALLOW:
817 if (policy->xfrm_nr == 0) {
818 /* Flow passes not transformed. */
819 xfrm_pol_put(policy);
820 return 0;
821 }
822
823 /* Try to find matching bundle.
824 *
825 * LATER: help from flow cache. It is optional, this
826 * is required only for output policy.
827 */
828 dst = xfrm_find_bundle(fl, policy, family);
829 if (IS_ERR(dst)) {
Patrick McHardye104411b2005-09-08 15:11:55 -0700830 err = PTR_ERR(dst);
831 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833
834 if (dst)
835 break;
836
837 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
838
839 if (unlikely(nx<0)) {
840 err = nx;
841 if (err == -EAGAIN && flags) {
842 DECLARE_WAITQUEUE(wait, current);
843
844 add_wait_queue(&km_waitq, &wait);
845 set_current_state(TASK_INTERRUPTIBLE);
846 schedule();
847 set_current_state(TASK_RUNNING);
848 remove_wait_queue(&km_waitq, &wait);
849
850 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
851
852 if (nx == -EAGAIN && signal_pending(current)) {
853 err = -ERESTART;
854 goto error;
855 }
856 if (nx == -EAGAIN ||
857 genid != atomic_read(&flow_cache_genid)) {
858 xfrm_pol_put(policy);
859 goto restart;
860 }
861 err = nx;
862 }
863 if (err < 0)
864 goto error;
865 }
866 if (nx == 0) {
867 /* Flow passes not transformed. */
868 xfrm_pol_put(policy);
869 return 0;
870 }
871
872 dst = dst_orig;
873 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
874
875 if (unlikely(err)) {
876 int i;
877 for (i=0; i<nx; i++)
878 xfrm_state_put(xfrm[i]);
879 goto error;
880 }
881
882 write_lock_bh(&policy->lock);
883 if (unlikely(policy->dead || stale_bundle(dst))) {
884 /* Wow! While we worked on resolving, this
885 * policy has gone. Retry. It is not paranoia,
886 * we just cannot enlist new bundle to dead object.
887 * We can't enlist stable bundles either.
888 */
889 write_unlock_bh(&policy->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 if (dst)
891 dst_free(dst);
Herbert Xu00de6512006-02-13 16:01:27 -0800892
893 err = -EHOSTUNREACH;
894 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 }
896 dst->next = policy->bundles;
897 policy->bundles = dst;
898 dst_hold(dst);
899 write_unlock_bh(&policy->lock);
900 }
901 *dst_p = dst;
902 dst_release(dst_orig);
903 xfrm_pol_put(policy);
904 return 0;
905
906error:
907 dst_release(dst_orig);
908 xfrm_pol_put(policy);
909 *dst_p = NULL;
910 return err;
911}
912EXPORT_SYMBOL(xfrm_lookup);
913
914/* When skb is transformed back to its "native" form, we have to
915 * check policy restrictions. At the moment we make this in maximally
916 * stupid way. Shame on me. :-) Of course, connected sockets must
917 * have policy cached at them.
918 */
919
920static inline int
921xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
922 unsigned short family)
923{
924 if (xfrm_state_kern(x))
925 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
926 return x->id.proto == tmpl->id.proto &&
927 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
928 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
929 x->props.mode == tmpl->mode &&
930 (tmpl->aalgos & (1<<x->props.aalgo)) &&
931 !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family));
932}
933
934static inline int
935xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
936 unsigned short family)
937{
938 int idx = start;
939
940 if (tmpl->optional) {
941 if (!tmpl->mode)
942 return start;
943 } else
944 start = -1;
945 for (; idx < sp->len; idx++) {
946 if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family))
947 return ++idx;
948 if (sp->x[idx].xvec->props.mode)
949 break;
950 }
951 return start;
952}
953
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800954int
955xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
957 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
958
959 if (unlikely(afinfo == NULL))
960 return -EAFNOSUPPORT;
961
962 afinfo->decode_session(skb, fl);
963 xfrm_policy_put_afinfo(afinfo);
964 return 0;
965}
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800966EXPORT_SYMBOL(xfrm_decode_session);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
968static inline int secpath_has_tunnel(struct sec_path *sp, int k)
969{
970 for (; k < sp->len; k++) {
971 if (sp->x[k].xvec->props.mode)
972 return 1;
973 }
974
975 return 0;
976}
977
978int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
979 unsigned short family)
980{
981 struct xfrm_policy *pol;
982 struct flowi fl;
Trent Jaegerdf718372005-12-13 23:12:27 -0800983 u8 fl_dir = policy_to_flow_dir(dir);
984 u32 sk_sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800986 if (xfrm_decode_session(skb, &fl, family) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 return 0;
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -0800988 nf_nat_decode_session(skb, &fl, family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Trent Jaegerdf718372005-12-13 23:12:27 -0800990 sk_sid = security_sk_sid(sk, &fl, fl_dir);
991
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 /* First, check used SA against their selectors. */
993 if (skb->sp) {
994 int i;
995
996 for (i=skb->sp->len-1; i>=0; i--) {
Trent Jaegerdf718372005-12-13 23:12:27 -0800997 struct sec_decap_state *xvec = &(skb->sp->x[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family))
999 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 }
1001 }
1002
1003 pol = NULL;
1004 if (sk && sk->sk_policy[dir])
Trent Jaegerdf718372005-12-13 23:12:27 -08001005 pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 if (!pol)
Trent Jaegerdf718372005-12-13 23:12:27 -08001008 pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 xfrm_policy_lookup);
1010
1011 if (!pol)
1012 return !skb->sp || !secpath_has_tunnel(skb->sp, 0);
1013
1014 pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1015
1016 if (pol->action == XFRM_POLICY_ALLOW) {
1017 struct sec_path *sp;
1018 static struct sec_path dummy;
1019 int i, k;
1020
1021 if ((sp = skb->sp) == NULL)
1022 sp = &dummy;
1023
1024 /* For each tunnel xfrm, find the first matching tmpl.
1025 * For each tmpl before that, find corresponding xfrm.
1026 * Order is _important_. Later we will implement
1027 * some barriers, but at the moment barriers
1028 * are implied between each two transformations.
1029 */
1030 for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) {
1031 k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family);
1032 if (k < 0)
1033 goto reject;
1034 }
1035
1036 if (secpath_has_tunnel(sp, k))
1037 goto reject;
1038
1039 xfrm_pol_put(pol);
1040 return 1;
1041 }
1042
1043reject:
1044 xfrm_pol_put(pol);
1045 return 0;
1046}
1047EXPORT_SYMBOL(__xfrm_policy_check);
1048
1049int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1050{
1051 struct flowi fl;
1052
Patrick McHardy3e3850e2006-01-06 23:04:54 -08001053 if (xfrm_decode_session(skb, &fl, family) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 return 0;
1055
1056 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1057}
1058EXPORT_SYMBOL(__xfrm_route_forward);
1059
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1061{
David S. Miller399c1802005-12-19 14:23:23 -08001062 /* If it is marked obsolete, which is how we even get here,
1063 * then we have purged it from the policy bundle list and we
1064 * did that for a good reason.
1065 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 return NULL;
1067}
1068
1069static int stale_bundle(struct dst_entry *dst)
1070{
1071 return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC);
1072}
1073
Herbert Xuaabc9762005-05-03 16:27:10 -07001074void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1077 dst->dev = &loopback_dev;
1078 dev_hold(&loopback_dev);
1079 dev_put(dev);
1080 }
1081}
Herbert Xuaabc9762005-05-03 16:27:10 -07001082EXPORT_SYMBOL(xfrm_dst_ifdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084static void xfrm_link_failure(struct sk_buff *skb)
1085{
1086 /* Impossible. Such dst must be popped before reaches point of failure. */
1087 return;
1088}
1089
1090static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1091{
1092 if (dst) {
1093 if (dst->obsolete) {
1094 dst_release(dst);
1095 dst = NULL;
1096 }
1097 }
1098 return dst;
1099}
1100
1101static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1102{
1103 int i;
1104 struct xfrm_policy *pol;
1105 struct dst_entry *dst, **dstp, *gc_list = NULL;
1106
1107 read_lock_bh(&xfrm_policy_lock);
1108 for (i=0; i<2*XFRM_POLICY_MAX; i++) {
1109 for (pol = xfrm_policy_list[i]; pol; pol = pol->next) {
1110 write_lock(&pol->lock);
1111 dstp = &pol->bundles;
1112 while ((dst=*dstp) != NULL) {
1113 if (func(dst)) {
1114 *dstp = dst->next;
1115 dst->next = gc_list;
1116 gc_list = dst;
1117 } else {
1118 dstp = &dst->next;
1119 }
1120 }
1121 write_unlock(&pol->lock);
1122 }
1123 }
1124 read_unlock_bh(&xfrm_policy_lock);
1125
1126 while (gc_list) {
1127 dst = gc_list;
1128 gc_list = dst->next;
1129 dst_free(dst);
1130 }
1131}
1132
1133static int unused_bundle(struct dst_entry *dst)
1134{
1135 return !atomic_read(&dst->__refcnt);
1136}
1137
1138static void __xfrm_garbage_collect(void)
1139{
1140 xfrm_prune_bundles(unused_bundle);
1141}
1142
1143int xfrm_flush_bundles(void)
1144{
1145 xfrm_prune_bundles(stale_bundle);
1146 return 0;
1147}
1148
David S. Miller399c1802005-12-19 14:23:23 -08001149static int always_true(struct dst_entry *dst)
1150{
1151 return 1;
1152}
1153
1154void xfrm_flush_all_bundles(void)
1155{
1156 xfrm_prune_bundles(always_true);
1157}
1158
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159void xfrm_init_pmtu(struct dst_entry *dst)
1160{
1161 do {
1162 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1163 u32 pmtu, route_mtu_cached;
1164
1165 pmtu = dst_mtu(dst->child);
1166 xdst->child_mtu_cached = pmtu;
1167
1168 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1169
1170 route_mtu_cached = dst_mtu(xdst->route);
1171 xdst->route_mtu_cached = route_mtu_cached;
1172
1173 if (pmtu > route_mtu_cached)
1174 pmtu = route_mtu_cached;
1175
1176 dst->metrics[RTAX_MTU-1] = pmtu;
1177 } while ((dst = dst->next));
1178}
1179
1180EXPORT_SYMBOL(xfrm_init_pmtu);
1181
1182/* Check that the bundle accepts the flow and its components are
1183 * still valid.
1184 */
1185
1186int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family)
1187{
1188 struct dst_entry *dst = &first->u.dst;
1189 struct xfrm_dst *last;
1190 u32 mtu;
1191
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07001192 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 (dst->dev && !netif_running(dst->dev)))
1194 return 0;
1195
1196 last = NULL;
1197
1198 do {
1199 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1200
1201 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1202 return 0;
1203 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1204 return 0;
1205
1206 mtu = dst_mtu(dst->child);
1207 if (xdst->child_mtu_cached != mtu) {
1208 last = xdst;
1209 xdst->child_mtu_cached = mtu;
1210 }
1211
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07001212 if (!dst_check(xdst->route, xdst->route_cookie))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 return 0;
1214 mtu = dst_mtu(xdst->route);
1215 if (xdst->route_mtu_cached != mtu) {
1216 last = xdst;
1217 xdst->route_mtu_cached = mtu;
1218 }
1219
1220 dst = dst->child;
1221 } while (dst->xfrm);
1222
1223 if (likely(!last))
1224 return 1;
1225
1226 mtu = last->child_mtu_cached;
1227 for (;;) {
1228 dst = &last->u.dst;
1229
1230 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1231 if (mtu > last->route_mtu_cached)
1232 mtu = last->route_mtu_cached;
1233 dst->metrics[RTAX_MTU-1] = mtu;
1234
1235 if (last == first)
1236 break;
1237
1238 last = last->u.next;
1239 last->child_mtu_cached = mtu;
1240 }
1241
1242 return 1;
1243}
1244
1245EXPORT_SYMBOL(xfrm_bundle_ok);
1246
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1248{
1249 int err = 0;
1250 if (unlikely(afinfo == NULL))
1251 return -EINVAL;
1252 if (unlikely(afinfo->family >= NPROTO))
1253 return -EAFNOSUPPORT;
1254 write_lock(&xfrm_policy_afinfo_lock);
1255 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1256 err = -ENOBUFS;
1257 else {
1258 struct dst_ops *dst_ops = afinfo->dst_ops;
1259 if (likely(dst_ops->kmem_cachep == NULL))
1260 dst_ops->kmem_cachep = xfrm_dst_cache;
1261 if (likely(dst_ops->check == NULL))
1262 dst_ops->check = xfrm_dst_check;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 if (likely(dst_ops->negative_advice == NULL))
1264 dst_ops->negative_advice = xfrm_negative_advice;
1265 if (likely(dst_ops->link_failure == NULL))
1266 dst_ops->link_failure = xfrm_link_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 if (likely(afinfo->garbage_collect == NULL))
1268 afinfo->garbage_collect = __xfrm_garbage_collect;
1269 xfrm_policy_afinfo[afinfo->family] = afinfo;
1270 }
1271 write_unlock(&xfrm_policy_afinfo_lock);
1272 return err;
1273}
1274EXPORT_SYMBOL(xfrm_policy_register_afinfo);
1275
1276int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
1277{
1278 int err = 0;
1279 if (unlikely(afinfo == NULL))
1280 return -EINVAL;
1281 if (unlikely(afinfo->family >= NPROTO))
1282 return -EAFNOSUPPORT;
1283 write_lock(&xfrm_policy_afinfo_lock);
1284 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
1285 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
1286 err = -EINVAL;
1287 else {
1288 struct dst_ops *dst_ops = afinfo->dst_ops;
1289 xfrm_policy_afinfo[afinfo->family] = NULL;
1290 dst_ops->kmem_cachep = NULL;
1291 dst_ops->check = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 dst_ops->negative_advice = NULL;
1293 dst_ops->link_failure = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 afinfo->garbage_collect = NULL;
1295 }
1296 }
1297 write_unlock(&xfrm_policy_afinfo_lock);
1298 return err;
1299}
1300EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
1301
1302static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
1303{
1304 struct xfrm_policy_afinfo *afinfo;
1305 if (unlikely(family >= NPROTO))
1306 return NULL;
1307 read_lock(&xfrm_policy_afinfo_lock);
1308 afinfo = xfrm_policy_afinfo[family];
1309 if (likely(afinfo != NULL))
1310 read_lock(&afinfo->lock);
1311 read_unlock(&xfrm_policy_afinfo_lock);
1312 return afinfo;
1313}
1314
1315static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
1316{
1317 if (unlikely(afinfo == NULL))
1318 return;
1319 read_unlock(&afinfo->lock);
1320}
1321
1322static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
1323{
1324 switch (event) {
1325 case NETDEV_DOWN:
1326 xfrm_flush_bundles();
1327 }
1328 return NOTIFY_DONE;
1329}
1330
1331static struct notifier_block xfrm_dev_notifier = {
1332 xfrm_dev_event,
1333 NULL,
1334 0
1335};
1336
1337static void __init xfrm_policy_init(void)
1338{
1339 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1340 sizeof(struct xfrm_dst),
1341 0, SLAB_HWCACHE_ALIGN,
1342 NULL, NULL);
1343 if (!xfrm_dst_cache)
1344 panic("XFRM: failed to allocate xfrm_dst_cache\n");
1345
1346 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL);
1347 register_netdevice_notifier(&xfrm_dev_notifier);
1348}
1349
1350void __init xfrm_init(void)
1351{
1352 xfrm_state_init();
1353 xfrm_policy_init();
1354 xfrm_input_init();
1355}
1356