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RDMA/amso1100: pci_module_init() conversion
[linux-2.6.git] / net / xfrm / xfrm_policy.c
blob7736b23c3f0386a7c0bab1840425fdb69e7a7cd8
1 /*
2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
13 *
14 */
15
16 #include <linux/slab.h>
17 #include <linux/kmod.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/workqueue.h>
21 #include <linux/notifier.h>
22 #include <linux/netdevice.h>
23 #include <linux/netfilter.h>
24 #include <linux/module.h>
25 #include <linux/cache.h>
26 #include <net/xfrm.h>
27 #include <net/ip.h>
28
29 #include "xfrm_hash.h"
30
31 DEFINE_MUTEX(xfrm_cfg_mutex);
32 EXPORT_SYMBOL(xfrm_cfg_mutex);
33
34 static DEFINE_RWLOCK(xfrm_policy_lock);
35
36 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
37 EXPORT_SYMBOL(xfrm_policy_count);
38
39 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
40 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
41
42 static kmem_cache_t *xfrm_dst_cache __read_mostly;
43
44 static struct work_struct xfrm_policy_gc_work;
45 static HLIST_HEAD(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 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
51 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
52
53 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
54 {
55 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
56 struct xfrm_type **typemap;
57 int err = 0;
58
59 if (unlikely(afinfo == NULL))
60 return -EAFNOSUPPORT;
61 typemap = afinfo->type_map;
62
63 if (likely(typemap[type->proto] == NULL))
64 typemap[type->proto] = type;
65 else
66 err = -EEXIST;
67 xfrm_policy_unlock_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_lock_afinfo(family);
75 struct xfrm_type **typemap;
76 int err = 0;
77
78 if (unlikely(afinfo == NULL))
79 return -EAFNOSUPPORT;
80 typemap = afinfo->type_map;
81
82 if (unlikely(typemap[type->proto] != type))
83 err = -ENOENT;
84 else
85 typemap[type->proto] = NULL;
86 xfrm_policy_unlock_afinfo(afinfo);
87 return err;
88 }
89 EXPORT_SYMBOL(xfrm_unregister_type);
90
91 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
92 {
93 struct xfrm_policy_afinfo *afinfo;
94 struct xfrm_type **typemap;
95 struct xfrm_type *type;
96 int modload_attempted = 0;
97
98 retry:
99 afinfo = xfrm_policy_get_afinfo(family);
100 if (unlikely(afinfo == NULL))
101 return NULL;
102 typemap = afinfo->type_map;
103
104 type = typemap[proto];
105 if (unlikely(type && !try_module_get(type->owner)))
106 type = NULL;
107 if (!type && !modload_attempted) {
108 xfrm_policy_put_afinfo(afinfo);
109 request_module("xfrm-type-%d-%d",
110 (int) family, (int) proto);
111 modload_attempted = 1;
112 goto retry;
113 }
114
115 xfrm_policy_put_afinfo(afinfo);
116 return type;
117 }
118
119 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
120 unsigned short family)
121 {
122 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
123 int err = 0;
124
125 if (unlikely(afinfo == NULL))
126 return -EAFNOSUPPORT;
127
128 if (likely(afinfo->dst_lookup != NULL))
129 err = afinfo->dst_lookup(dst, fl);
130 else
131 err = -EINVAL;
132 xfrm_policy_put_afinfo(afinfo);
133 return err;
134 }
135 EXPORT_SYMBOL(xfrm_dst_lookup);
136
137 void xfrm_put_type(struct xfrm_type *type)
138 {
139 module_put(type->owner);
140 }
141
142 int xfrm_register_mode(struct xfrm_mode *mode, int family)
143 {
144 struct xfrm_policy_afinfo *afinfo;
145 struct xfrm_mode **modemap;
146 int err;
147
148 if (unlikely(mode->encap >= XFRM_MODE_MAX))
149 return -EINVAL;
150
151 afinfo = xfrm_policy_lock_afinfo(family);
152 if (unlikely(afinfo == NULL))
153 return -EAFNOSUPPORT;
154
155 err = -EEXIST;
156 modemap = afinfo->mode_map;
157 if (likely(modemap[mode->encap] == NULL)) {
158 modemap[mode->encap] = mode;
159 err = 0;
160 }
161
162 xfrm_policy_unlock_afinfo(afinfo);
163 return err;
164 }
165 EXPORT_SYMBOL(xfrm_register_mode);
166
167 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
168 {
169 struct xfrm_policy_afinfo *afinfo;
170 struct xfrm_mode **modemap;
171 int err;
172
173 if (unlikely(mode->encap >= XFRM_MODE_MAX))
174 return -EINVAL;
175
176 afinfo = xfrm_policy_lock_afinfo(family);
177 if (unlikely(afinfo == NULL))
178 return -EAFNOSUPPORT;
179
180 err = -ENOENT;
181 modemap = afinfo->mode_map;
182 if (likely(modemap[mode->encap] == mode)) {
183 modemap[mode->encap] = NULL;
184 err = 0;
185 }
186
187 xfrm_policy_unlock_afinfo(afinfo);
188 return err;
189 }
190 EXPORT_SYMBOL(xfrm_unregister_mode);
191
192 struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
193 {
194 struct xfrm_policy_afinfo *afinfo;
195 struct xfrm_mode *mode;
196 int modload_attempted = 0;
197
198 if (unlikely(encap >= XFRM_MODE_MAX))
199 return NULL;
200
201 retry:
202 afinfo = xfrm_policy_get_afinfo(family);
203 if (unlikely(afinfo == NULL))
204 return NULL;
205
206 mode = afinfo->mode_map[encap];
207 if (unlikely(mode && !try_module_get(mode->owner)))
208 mode = NULL;
209 if (!mode && !modload_attempted) {
210 xfrm_policy_put_afinfo(afinfo);
211 request_module("xfrm-mode-%d-%d", family, encap);
212 modload_attempted = 1;
213 goto retry;
214 }
215
216 xfrm_policy_put_afinfo(afinfo);
217 return mode;
218 }
219
220 void xfrm_put_mode(struct xfrm_mode *mode)
221 {
222 module_put(mode->owner);
223 }
224
225 static inline unsigned long make_jiffies(long secs)
226 {
227 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
228 return MAX_SCHEDULE_TIMEOUT-1;
229 else
230 return secs*HZ;
231 }
232
233 static void xfrm_policy_timer(unsigned long data)
234 {
235 struct xfrm_policy *xp = (struct xfrm_policy*)data;
236 unsigned long now = (unsigned long)xtime.tv_sec;
237 long next = LONG_MAX;
238 int warn = 0;
239 int dir;
240
241 read_lock(&xp->lock);
242
243 if (xp->dead)
244 goto out;
245
246 dir = xfrm_policy_id2dir(xp->index);
247
248 if (xp->lft.hard_add_expires_seconds) {
249 long tmo = xp->lft.hard_add_expires_seconds +
250 xp->curlft.add_time - now;
251 if (tmo <= 0)
252 goto expired;
253 if (tmo < next)
254 next = tmo;
255 }
256 if (xp->lft.hard_use_expires_seconds) {
257 long tmo = xp->lft.hard_use_expires_seconds +
258 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
259 if (tmo <= 0)
260 goto expired;
261 if (tmo < next)
262 next = tmo;
263 }
264 if (xp->lft.soft_add_expires_seconds) {
265 long tmo = xp->lft.soft_add_expires_seconds +
266 xp->curlft.add_time - now;
267 if (tmo <= 0) {
268 warn = 1;
269 tmo = XFRM_KM_TIMEOUT;
270 }
271 if (tmo < next)
272 next = tmo;
273 }
274 if (xp->lft.soft_use_expires_seconds) {
275 long tmo = xp->lft.soft_use_expires_seconds +
276 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
277 if (tmo <= 0) {
278 warn = 1;
279 tmo = XFRM_KM_TIMEOUT;
280 }
281 if (tmo < next)
282 next = tmo;
283 }
284
285 if (warn)
286 km_policy_expired(xp, dir, 0, 0);
287 if (next != LONG_MAX &&
288 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
289 xfrm_pol_hold(xp);
290
291 out:
292 read_unlock(&xp->lock);
293 xfrm_pol_put(xp);
294 return;
295
296 expired:
297 read_unlock(&xp->lock);
298 if (!xfrm_policy_delete(xp, dir))
299 km_policy_expired(xp, dir, 1, 0);
300 xfrm_pol_put(xp);
301 }
302
303
304 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
305 * SPD calls.
306 */
307
308 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
309 {
310 struct xfrm_policy *policy;
311
312 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
313
314 if (policy) {
315 INIT_HLIST_NODE(&policy->bydst);
316 INIT_HLIST_NODE(&policy->byidx);
317 rwlock_init(&policy->lock);
318 atomic_set(&policy->refcnt, 1);
319 init_timer(&policy->timer);
320 policy->timer.data = (unsigned long)policy;
321 policy->timer.function = xfrm_policy_timer;
322 }
323 return policy;
324 }
325 EXPORT_SYMBOL(xfrm_policy_alloc);
326
327 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
328
329 void __xfrm_policy_destroy(struct xfrm_policy *policy)
330 {
331 BUG_ON(!policy->dead);
332
333 BUG_ON(policy->bundles);
334
335 if (del_timer(&policy->timer))
336 BUG();
337
338 security_xfrm_policy_free(policy);
339 kfree(policy);
340 }
341 EXPORT_SYMBOL(__xfrm_policy_destroy);
342
343 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
344 {
345 struct dst_entry *dst;
346
347 while ((dst = policy->bundles) != NULL) {
348 policy->bundles = dst->next;
349 dst_free(dst);
350 }
351
352 if (del_timer(&policy->timer))
353 atomic_dec(&policy->refcnt);
354
355 if (atomic_read(&policy->refcnt) > 1)
356 flow_cache_flush();
357
358 xfrm_pol_put(policy);
359 }
360
361 static void xfrm_policy_gc_task(void *data)
362 {
363 struct xfrm_policy *policy;
364 struct hlist_node *entry, *tmp;
365 struct hlist_head gc_list;
366
367 spin_lock_bh(&xfrm_policy_gc_lock);
368 gc_list.first = xfrm_policy_gc_list.first;
369 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
370 spin_unlock_bh(&xfrm_policy_gc_lock);
371
372 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
373 xfrm_policy_gc_kill(policy);
374 }
375
376 /* Rule must be locked. Release descentant resources, announce
377 * entry dead. The rule must be unlinked from lists to the moment.
378 */
379
380 static void xfrm_policy_kill(struct xfrm_policy *policy)
381 {
382 int dead;
383
384 write_lock_bh(&policy->lock);
385 dead = policy->dead;
386 policy->dead = 1;
387 write_unlock_bh(&policy->lock);
388
389 if (unlikely(dead)) {
390 WARN_ON(1);
391 return;
392 }
393
394 spin_lock(&xfrm_policy_gc_lock);
395 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
396 spin_unlock(&xfrm_policy_gc_lock);
397
398 schedule_work(&xfrm_policy_gc_work);
399 }
400
401 struct xfrm_policy_hash {
402 struct hlist_head *table;
403 unsigned int hmask;
404 };
405
406 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
407 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
408 static struct hlist_head *xfrm_policy_byidx __read_mostly;
409 static unsigned int xfrm_idx_hmask __read_mostly;
410 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
411
412 static inline unsigned int idx_hash(u32 index)
413 {
414 return __idx_hash(index, xfrm_idx_hmask);
415 }
416
417 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
418 {
419 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
420 unsigned int hash = __sel_hash(sel, family, hmask);
421
422 return (hash == hmask + 1 ?
423 &xfrm_policy_inexact[dir] :
424 xfrm_policy_bydst[dir].table + hash);
425 }
426
427 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
428 {
429 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
430 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
431
432 return xfrm_policy_bydst[dir].table + hash;
433 }
434
435 static void xfrm_dst_hash_transfer(struct hlist_head *list,
436 struct hlist_head *ndsttable,
437 unsigned int nhashmask)
438 {
439 struct hlist_node *entry, *tmp;
440 struct xfrm_policy *pol;
441
442 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
443 unsigned int h;
444
445 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
446 pol->family, nhashmask);
447 hlist_add_head(&pol->bydst, ndsttable+h);
448 }
449 }
450
451 static void xfrm_idx_hash_transfer(struct hlist_head *list,
452 struct hlist_head *nidxtable,
453 unsigned int nhashmask)
454 {
455 struct hlist_node *entry, *tmp;
456 struct xfrm_policy *pol;
457
458 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
459 unsigned int h;
460
461 h = __idx_hash(pol->index, nhashmask);
462 hlist_add_head(&pol->byidx, nidxtable+h);
463 }
464 }
465
466 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
467 {
468 return ((old_hmask + 1) << 1) - 1;
469 }
470
471 static void xfrm_bydst_resize(int dir)
472 {
473 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
474 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
475 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
476 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
477 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
478 int i;
479
480 if (!ndst)
481 return;
482
483 write_lock_bh(&xfrm_policy_lock);
484
485 for (i = hmask; i >= 0; i--)
486 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
487
488 xfrm_policy_bydst[dir].table = ndst;
489 xfrm_policy_bydst[dir].hmask = nhashmask;
490
491 write_unlock_bh(&xfrm_policy_lock);
492
493 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
494 }
495
496 static void xfrm_byidx_resize(int total)
497 {
498 unsigned int hmask = xfrm_idx_hmask;
499 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
500 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
501 struct hlist_head *oidx = xfrm_policy_byidx;
502 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
503 int i;
504
505 if (!nidx)
506 return;
507
508 write_lock_bh(&xfrm_policy_lock);
509
510 for (i = hmask; i >= 0; i--)
511 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
512
513 xfrm_policy_byidx = nidx;
514 xfrm_idx_hmask = nhashmask;
515
516 write_unlock_bh(&xfrm_policy_lock);
517
518 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
519 }
520
521 static inline int xfrm_bydst_should_resize(int dir, int *total)
522 {
523 unsigned int cnt = xfrm_policy_count[dir];
524 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
525
526 if (total)
527 *total += cnt;
528
529 if ((hmask + 1) < xfrm_policy_hashmax &&
530 cnt > hmask)
531 return 1;
532
533 return 0;
534 }
535
536 static inline int xfrm_byidx_should_resize(int total)
537 {
538 unsigned int hmask = xfrm_idx_hmask;
539
540 if ((hmask + 1) < xfrm_policy_hashmax &&
541 total > hmask)
542 return 1;
543
544 return 0;
545 }
546
547 static DEFINE_MUTEX(hash_resize_mutex);
548
549 static void xfrm_hash_resize(void *__unused)
550 {
551 int dir, total;
552
553 mutex_lock(&hash_resize_mutex);
554
555 total = 0;
556 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
557 if (xfrm_bydst_should_resize(dir, &total))
558 xfrm_bydst_resize(dir);
559 }
560 if (xfrm_byidx_should_resize(total))
561 xfrm_byidx_resize(total);
562
563 mutex_unlock(&hash_resize_mutex);
564 }
565
566 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL);
567
568 /* Generate new index... KAME seems to generate them ordered by cost
569 * of an absolute inpredictability of ordering of rules. This will not pass. */
570 static u32 xfrm_gen_index(u8 type, int dir)
571 {
572 static u32 idx_generator;
573
574 for (;;) {
575 struct hlist_node *entry;
576 struct hlist_head *list;
577 struct xfrm_policy *p;
578 u32 idx;
579 int found;
580
581 idx = (idx_generator | dir);
582 idx_generator += 8;
583 if (idx == 0)
584 idx = 8;
585 list = xfrm_policy_byidx + idx_hash(idx);
586 found = 0;
587 hlist_for_each_entry(p, entry, list, byidx) {
588 if (p->index == idx) {
589 found = 1;
590 break;
591 }
592 }
593 if (!found)
594 return idx;
595 }
596 }
597
598 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
599 {
600 u32 *p1 = (u32 *) s1;
601 u32 *p2 = (u32 *) s2;
602 int len = sizeof(struct xfrm_selector) / sizeof(u32);
603 int i;
604
605 for (i = 0; i < len; i++) {
606 if (p1[i] != p2[i])
607 return 1;
608 }
609
610 return 0;
611 }
612
613 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
614 {
615 struct xfrm_policy *pol;
616 struct xfrm_policy *delpol;
617 struct hlist_head *chain;
618 struct hlist_node *entry, *newpos, *last;
619 struct dst_entry *gc_list;
620
621 write_lock_bh(&xfrm_policy_lock);
622 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
623 delpol = NULL;
624 newpos = NULL;
625 last = NULL;
626 hlist_for_each_entry(pol, entry, chain, bydst) {
627 if (!delpol &&
628 pol->type == policy->type &&
629 !selector_cmp(&pol->selector, &policy->selector) &&
630 xfrm_sec_ctx_match(pol->security, policy->security)) {
631 if (excl) {
632 write_unlock_bh(&xfrm_policy_lock);
633 return -EEXIST;
634 }
635 delpol = pol;
636 if (policy->priority > pol->priority)
637 continue;
638 } else if (policy->priority >= pol->priority) {
639 last = &pol->bydst;
640 continue;
641 }
642 if (!newpos)
643 newpos = &pol->bydst;
644 if (delpol)
645 break;
646 last = &pol->bydst;
647 }
648 if (!newpos)
649 newpos = last;
650 if (newpos)
651 hlist_add_after(newpos, &policy->bydst);
652 else
653 hlist_add_head(&policy->bydst, chain);
654 xfrm_pol_hold(policy);
655 xfrm_policy_count[dir]++;
656 atomic_inc(&flow_cache_genid);
657 if (delpol) {
658 hlist_del(&delpol->bydst);
659 hlist_del(&delpol->byidx);
660 xfrm_policy_count[dir]--;
661 }
662 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
663 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
664 policy->curlft.add_time = (unsigned long)xtime.tv_sec;
665 policy->curlft.use_time = 0;
666 if (!mod_timer(&policy->timer, jiffies + HZ))
667 xfrm_pol_hold(policy);
668 write_unlock_bh(&xfrm_policy_lock);
669
670 if (delpol)
671 xfrm_policy_kill(delpol);
672 else if (xfrm_bydst_should_resize(dir, NULL))
673 schedule_work(&xfrm_hash_work);
674
675 read_lock_bh(&xfrm_policy_lock);
676 gc_list = NULL;
677 entry = &policy->bydst;
678 hlist_for_each_entry_continue(policy, entry, bydst) {
679 struct dst_entry *dst;
680
681 write_lock(&policy->lock);
682 dst = policy->bundles;
683 if (dst) {
684 struct dst_entry *tail = dst;
685 while (tail->next)
686 tail = tail->next;
687 tail->next = gc_list;
688 gc_list = dst;
689
690 policy->bundles = NULL;
691 }
692 write_unlock(&policy->lock);
693 }
694 read_unlock_bh(&xfrm_policy_lock);
695
696 while (gc_list) {
697 struct dst_entry *dst = gc_list;
698
699 gc_list = dst->next;
700 dst_free(dst);
701 }
702
703 return 0;
704 }
705 EXPORT_SYMBOL(xfrm_policy_insert);
706
707 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
708 struct xfrm_selector *sel,
709 struct xfrm_sec_ctx *ctx, int delete)
710 {
711 struct xfrm_policy *pol, *ret;
712 struct hlist_head *chain;
713 struct hlist_node *entry;
714
715 write_lock_bh(&xfrm_policy_lock);
716 chain = policy_hash_bysel(sel, sel->family, dir);
717 ret = NULL;
718 hlist_for_each_entry(pol, entry, chain, bydst) {
719 if (pol->type == type &&
720 !selector_cmp(sel, &pol->selector) &&
721 xfrm_sec_ctx_match(ctx, pol->security)) {
722 xfrm_pol_hold(pol);
723 if (delete) {
724 hlist_del(&pol->bydst);
725 hlist_del(&pol->byidx);
726 xfrm_policy_count[dir]--;
727 }
728 ret = pol;
729 break;
730 }
731 }
732 write_unlock_bh(&xfrm_policy_lock);
733
734 if (ret && delete) {
735 atomic_inc(&flow_cache_genid);
736 xfrm_policy_kill(ret);
737 }
738 return ret;
739 }
740 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
741
742 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete)
743 {
744 struct xfrm_policy *pol, *ret;
745 struct hlist_head *chain;
746 struct hlist_node *entry;
747
748 write_lock_bh(&xfrm_policy_lock);
749 chain = xfrm_policy_byidx + idx_hash(id);
750 ret = NULL;
751 hlist_for_each_entry(pol, entry, chain, byidx) {
752 if (pol->type == type && pol->index == id) {
753 xfrm_pol_hold(pol);
754 if (delete) {
755 hlist_del(&pol->bydst);
756 hlist_del(&pol->byidx);
757 xfrm_policy_count[dir]--;
758 }
759 ret = pol;
760 break;
761 }
762 }
763 write_unlock_bh(&xfrm_policy_lock);
764
765 if (ret && delete) {
766 atomic_inc(&flow_cache_genid);
767 xfrm_policy_kill(ret);
768 }
769 return ret;
770 }
771 EXPORT_SYMBOL(xfrm_policy_byid);
772
773 void xfrm_policy_flush(u8 type)
774 {
775 int dir;
776
777 write_lock_bh(&xfrm_policy_lock);
778 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
779 struct xfrm_policy *pol;
780 struct hlist_node *entry;
781 int i, killed;
782
783 killed = 0;
784 again1:
785 hlist_for_each_entry(pol, entry,
786 &xfrm_policy_inexact[dir], bydst) {
787 if (pol->type != type)
788 continue;
789 hlist_del(&pol->bydst);
790 hlist_del(&pol->byidx);
791 write_unlock_bh(&xfrm_policy_lock);
792
793 xfrm_policy_kill(pol);
794 killed++;
795
796 write_lock_bh(&xfrm_policy_lock);
797 goto again1;
798 }
799
800 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
801 again2:
802 hlist_for_each_entry(pol, entry,
803 xfrm_policy_bydst[dir].table + i,
804 bydst) {
805 if (pol->type != type)
806 continue;
807 hlist_del(&pol->bydst);
808 hlist_del(&pol->byidx);
809 write_unlock_bh(&xfrm_policy_lock);
810
811 xfrm_policy_kill(pol);
812 killed++;
813
814 write_lock_bh(&xfrm_policy_lock);
815 goto again2;
816 }
817 }
818
819 xfrm_policy_count[dir] -= killed;
820 }
821 atomic_inc(&flow_cache_genid);
822 write_unlock_bh(&xfrm_policy_lock);
823 }
824 EXPORT_SYMBOL(xfrm_policy_flush);
825
826 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
827 void *data)
828 {
829 struct xfrm_policy *pol;
830 struct hlist_node *entry;
831 int dir, count, error;
832
833 read_lock_bh(&xfrm_policy_lock);
834 count = 0;
835 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
836 struct hlist_head *table = xfrm_policy_bydst[dir].table;
837 int i;
838
839 hlist_for_each_entry(pol, entry,
840 &xfrm_policy_inexact[dir], bydst) {
841 if (pol->type == type)
842 count++;
843 }
844 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
845 hlist_for_each_entry(pol, entry, table + i, bydst) {
846 if (pol->type == type)
847 count++;
848 }
849 }
850 }
851
852 if (count == 0) {
853 error = -ENOENT;
854 goto out;
855 }
856
857 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
858 struct hlist_head *table = xfrm_policy_bydst[dir].table;
859 int i;
860
861 hlist_for_each_entry(pol, entry,
862 &xfrm_policy_inexact[dir], bydst) {
863 if (pol->type != type)
864 continue;
865 error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
866 if (error)
867 goto out;
868 }
869 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
870 hlist_for_each_entry(pol, entry, table + i, bydst) {
871 if (pol->type != type)
872 continue;
873 error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
874 if (error)
875 goto out;
876 }
877 }
878 }
879 error = 0;
880 out:
881 read_unlock_bh(&xfrm_policy_lock);
882 return error;
883 }
884 EXPORT_SYMBOL(xfrm_policy_walk);
885
886 /*
887 * Find policy to apply to this flow.
888 *
889 * Returns 0 if policy found, else an -errno.
890 */
891 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
892 u8 type, u16 family, int dir)
893 {
894 struct xfrm_selector *sel = &pol->selector;
895 int match, ret = -ESRCH;
896
897 if (pol->family != family ||
898 pol->type != type)
899 return ret;
900
901 match = xfrm_selector_match(sel, fl, family);
902 if (match)
903 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
904
905 return ret;
906 }
907
908 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
909 u16 family, u8 dir)
910 {
911 int err;
912 struct xfrm_policy *pol, *ret;
913 xfrm_address_t *daddr, *saddr;
914 struct hlist_node *entry;
915 struct hlist_head *chain;
916 u32 priority = ~0U;
917
918 daddr = xfrm_flowi_daddr(fl, family);
919 saddr = xfrm_flowi_saddr(fl, family);
920 if (unlikely(!daddr || !saddr))
921 return NULL;
922
923 read_lock_bh(&xfrm_policy_lock);
924 chain = policy_hash_direct(daddr, saddr, family, dir);
925 ret = NULL;
926 hlist_for_each_entry(pol, entry, chain, bydst) {
927 err = xfrm_policy_match(pol, fl, type, family, dir);
928 if (err) {
929 if (err == -ESRCH)
930 continue;
931 else {
932 ret = ERR_PTR(err);
933 goto fail;
934 }
935 } else {
936 ret = pol;
937 priority = ret->priority;
938 break;
939 }
940 }
941 chain = &xfrm_policy_inexact[dir];
942 hlist_for_each_entry(pol, entry, chain, bydst) {
943 err = xfrm_policy_match(pol, fl, type, family, dir);
944 if (err) {
945 if (err == -ESRCH)
946 continue;
947 else {
948 ret = ERR_PTR(err);
949 goto fail;
950 }
951 } else if (pol->priority < priority) {
952 ret = pol;
953 break;
954 }
955 }
956 if (ret)
957 xfrm_pol_hold(ret);
958 fail:
959 read_unlock_bh(&xfrm_policy_lock);
960
961 return ret;
962 }
963
964 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
965 void **objp, atomic_t **obj_refp)
966 {
967 struct xfrm_policy *pol;
968 int err = 0;
969
970 #ifdef CONFIG_XFRM_SUB_POLICY
971 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
972 if (IS_ERR(pol)) {
973 err = PTR_ERR(pol);
974 pol = NULL;
975 }
976 if (pol || err)
977 goto end;
978 #endif
979 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
980 if (IS_ERR(pol)) {
981 err = PTR_ERR(pol);
982 pol = NULL;
983 }
984 #ifdef CONFIG_XFRM_SUB_POLICY
985 end:
986 #endif
987 if ((*objp = (void *) pol) != NULL)
988 *obj_refp = &pol->refcnt;
989 return err;
990 }
991
992 static inline int policy_to_flow_dir(int dir)
993 {
994 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
995 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
996 XFRM_POLICY_FWD == FLOW_DIR_FWD)
997 return dir;
998 switch (dir) {
999 default:
1000 case XFRM_POLICY_IN:
1001 return FLOW_DIR_IN;
1002 case XFRM_POLICY_OUT:
1003 return FLOW_DIR_OUT;
1004 case XFRM_POLICY_FWD:
1005 return FLOW_DIR_FWD;
1006 };
1007 }
1008
1009 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1010 {
1011 struct xfrm_policy *pol;
1012
1013 read_lock_bh(&xfrm_policy_lock);
1014 if ((pol = sk->sk_policy[dir]) != NULL) {
1015 int match = xfrm_selector_match(&pol->selector, fl,
1016 sk->sk_family);
1017 int err = 0;
1018
1019 if (match) {
1020 err = security_xfrm_policy_lookup(pol, fl->secid,
1021 policy_to_flow_dir(dir));
1022 if (!err)
1023 xfrm_pol_hold(pol);
1024 else if (err == -ESRCH)
1025 pol = NULL;
1026 else
1027 pol = ERR_PTR(err);
1028 } else
1029 pol = NULL;
1030 }
1031 read_unlock_bh(&xfrm_policy_lock);
1032 return pol;
1033 }
1034
1035 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1036 {
1037 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1038 pol->family, dir);
1039
1040 hlist_add_head(&pol->bydst, chain);
1041 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1042 xfrm_policy_count[dir]++;
1043 xfrm_pol_hold(pol);
1044
1045 if (xfrm_bydst_should_resize(dir, NULL))
1046 schedule_work(&xfrm_hash_work);
1047 }
1048
1049 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1050 int dir)
1051 {
1052 if (hlist_unhashed(&pol->bydst))
1053 return NULL;
1054
1055 hlist_del(&pol->bydst);
1056 hlist_del(&pol->byidx);
1057 xfrm_policy_count[dir]--;
1058
1059 return pol;
1060 }
1061
1062 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1063 {
1064 write_lock_bh(&xfrm_policy_lock);
1065 pol = __xfrm_policy_unlink(pol, dir);
1066 write_unlock_bh(&xfrm_policy_lock);
1067 if (pol) {
1068 if (dir < XFRM_POLICY_MAX)
1069 atomic_inc(&flow_cache_genid);
1070 xfrm_policy_kill(pol);
1071 return 0;
1072 }
1073 return -ENOENT;
1074 }
1075 EXPORT_SYMBOL(xfrm_policy_delete);
1076
1077 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1078 {
1079 struct xfrm_policy *old_pol;
1080
1081 #ifdef CONFIG_XFRM_SUB_POLICY
1082 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1083 return -EINVAL;
1084 #endif
1085
1086 write_lock_bh(&xfrm_policy_lock);
1087 old_pol = sk->sk_policy[dir];
1088 sk->sk_policy[dir] = pol;
1089 if (pol) {
1090 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
1091 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1092 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1093 }
1094 if (old_pol)
1095 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1096 write_unlock_bh(&xfrm_policy_lock);
1097
1098 if (old_pol) {
1099 xfrm_policy_kill(old_pol);
1100 }
1101 return 0;
1102 }
1103
1104 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1105 {
1106 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1107
1108 if (newp) {
1109 newp->selector = old->selector;
1110 if (security_xfrm_policy_clone(old, newp)) {
1111 kfree(newp);
1112 return NULL; /* ENOMEM */
1113 }
1114 newp->lft = old->lft;
1115 newp->curlft = old->curlft;
1116 newp->action = old->action;
1117 newp->flags = old->flags;
1118 newp->xfrm_nr = old->xfrm_nr;
1119 newp->index = old->index;
1120 newp->type = old->type;
1121 memcpy(newp->xfrm_vec, old->xfrm_vec,
1122 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1123 write_lock_bh(&xfrm_policy_lock);
1124 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1125 write_unlock_bh(&xfrm_policy_lock);
1126 xfrm_pol_put(newp);
1127 }
1128 return newp;
1129 }
1130
1131 int __xfrm_sk_clone_policy(struct sock *sk)
1132 {
1133 struct xfrm_policy *p0 = sk->sk_policy[0],
1134 *p1 = sk->sk_policy[1];
1135
1136 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1137 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1138 return -ENOMEM;
1139 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1140 return -ENOMEM;
1141 return 0;
1142 }
1143
1144 static int
1145 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1146 unsigned short family)
1147 {
1148 int err;
1149 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1150
1151 if (unlikely(afinfo == NULL))
1152 return -EINVAL;
1153 err = afinfo->get_saddr(local, remote);
1154 xfrm_policy_put_afinfo(afinfo);
1155 return err;
1156 }
1157
1158 /* Resolve list of templates for the flow, given policy. */
1159
1160 static int
1161 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1162 struct xfrm_state **xfrm,
1163 unsigned short family)
1164 {
1165 int nx;
1166 int i, error;
1167 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1168 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1169 xfrm_address_t tmp;
1170
1171 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1172 struct xfrm_state *x;
1173 xfrm_address_t *remote = daddr;
1174 xfrm_address_t *local = saddr;
1175 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1176
1177 if (tmpl->mode == XFRM_MODE_TUNNEL) {
1178 remote = &tmpl->id.daddr;
1179 local = &tmpl->saddr;
1180 if (xfrm_addr_any(local, family)) {
1181 error = xfrm_get_saddr(&tmp, remote, family);
1182 if (error)
1183 goto fail;
1184 local = &tmp;
1185 }
1186 }
1187
1188 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1189
1190 if (x && x->km.state == XFRM_STATE_VALID) {
1191 xfrm[nx++] = x;
1192 daddr = remote;
1193 saddr = local;
1194 continue;
1195 }
1196 if (x) {
1197 error = (x->km.state == XFRM_STATE_ERROR ?
1198 -EINVAL : -EAGAIN);
1199 xfrm_state_put(x);
1200 }
1201
1202 if (!tmpl->optional)
1203 goto fail;
1204 }
1205 return nx;
1206
1207 fail:
1208 for (nx--; nx>=0; nx--)
1209 xfrm_state_put(xfrm[nx]);
1210 return error;
1211 }
1212
1213 static int
1214 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1215 struct xfrm_state **xfrm,
1216 unsigned short family)
1217 {
1218 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1219 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1220 int cnx = 0;
1221 int error;
1222 int ret;
1223 int i;
1224
1225 for (i = 0; i < npols; i++) {
1226 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1227 error = -ENOBUFS;
1228 goto fail;
1229 }
1230
1231 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1232 if (ret < 0) {
1233 error = ret;
1234 goto fail;
1235 } else
1236 cnx += ret;
1237 }
1238
1239 /* found states are sorted for outbound processing */
1240 if (npols > 1)
1241 xfrm_state_sort(xfrm, tpp, cnx, family);
1242
1243 return cnx;
1244
1245 fail:
1246 for (cnx--; cnx>=0; cnx--)
1247 xfrm_state_put(tpp[cnx]);
1248 return error;
1249
1250 }
1251
1252 /* Check that the bundle accepts the flow and its components are
1253 * still valid.
1254 */
1255
1256 static struct dst_entry *
1257 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1258 {
1259 struct dst_entry *x;
1260 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1261 if (unlikely(afinfo == NULL))
1262 return ERR_PTR(-EINVAL);
1263 x = afinfo->find_bundle(fl, policy);
1264 xfrm_policy_put_afinfo(afinfo);
1265 return x;
1266 }
1267
1268 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1269 * all the metrics... Shortly, bundle a bundle.
1270 */
1271
1272 static int
1273 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1274 struct flowi *fl, struct dst_entry **dst_p,
1275 unsigned short family)
1276 {
1277 int err;
1278 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1279 if (unlikely(afinfo == NULL))
1280 return -EINVAL;
1281 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1282 xfrm_policy_put_afinfo(afinfo);
1283 return err;
1284 }
1285
1286
1287 static int stale_bundle(struct dst_entry *dst);
1288
1289 /* Main function: finds/creates a bundle for given flow.
1290 *
1291 * At the moment we eat a raw IP route. Mostly to speed up lookups
1292 * on interfaces with disabled IPsec.
1293 */
1294 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1295 struct sock *sk, int flags)
1296 {
1297 struct xfrm_policy *policy;
1298 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1299 int npols;
1300 int pol_dead;
1301 int xfrm_nr;
1302 int pi;
1303 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1304 struct dst_entry *dst, *dst_orig = *dst_p;
1305 int nx = 0;
1306 int err;
1307 u32 genid;
1308 u16 family;
1309 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1310
1311 restart:
1312 genid = atomic_read(&flow_cache_genid);
1313 policy = NULL;
1314 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1315 pols[pi] = NULL;
1316 npols = 0;
1317 pol_dead = 0;
1318 xfrm_nr = 0;
1319
1320 if (sk && sk->sk_policy[1]) {
1321 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1322 if (IS_ERR(policy))
1323 return PTR_ERR(policy);
1324 }
1325
1326 if (!policy) {
1327 /* To accelerate a bit... */
1328 if ((dst_orig->flags & DST_NOXFRM) ||
1329 !xfrm_policy_count[XFRM_POLICY_OUT])
1330 return 0;
1331
1332 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1333 dir, xfrm_policy_lookup);
1334 if (IS_ERR(policy))
1335 return PTR_ERR(policy);
1336 }
1337
1338 if (!policy)
1339 return 0;
1340
1341 family = dst_orig->ops->family;
1342 policy->curlft.use_time = (unsigned long)xtime.tv_sec;
1343 pols[0] = policy;
1344 npols ++;
1345 xfrm_nr += pols[0]->xfrm_nr;
1346
1347 switch (policy->action) {
1348 case XFRM_POLICY_BLOCK:
1349 /* Prohibit the flow */
1350 err = -EPERM;
1351 goto error;
1352
1353 case XFRM_POLICY_ALLOW:
1354 #ifndef CONFIG_XFRM_SUB_POLICY
1355 if (policy->xfrm_nr == 0) {
1356 /* Flow passes not transformed. */
1357 xfrm_pol_put(policy);
1358 return 0;
1359 }
1360 #endif
1361
1362 /* Try to find matching bundle.
1363 *
1364 * LATER: help from flow cache. It is optional, this
1365 * is required only for output policy.
1366 */
1367 dst = xfrm_find_bundle(fl, policy, family);
1368 if (IS_ERR(dst)) {
1369 err = PTR_ERR(dst);
1370 goto error;
1371 }
1372
1373 if (dst)
1374 break;
1375
1376 #ifdef CONFIG_XFRM_SUB_POLICY
1377 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1378 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1379 fl, family,
1380 XFRM_POLICY_OUT);
1381 if (pols[1]) {
1382 if (IS_ERR(pols[1])) {
1383 err = PTR_ERR(pols[1]);
1384 goto error;
1385 }
1386 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1387 err = -EPERM;
1388 goto error;
1389 }
1390 npols ++;
1391 xfrm_nr += pols[1]->xfrm_nr;
1392 }
1393 }
1394
1395 /*
1396 * Because neither flowi nor bundle information knows about
1397 * transformation template size. On more than one policy usage
1398 * we can realize whether all of them is bypass or not after
1399 * they are searched. See above not-transformed bypass
1400 * is surrounded by non-sub policy configuration, too.
1401 */
1402 if (xfrm_nr == 0) {
1403 /* Flow passes not transformed. */
1404 xfrm_pols_put(pols, npols);
1405 return 0;
1406 }
1407
1408 #endif
1409 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1410
1411 if (unlikely(nx<0)) {
1412 err = nx;
1413 if (err == -EAGAIN && flags) {
1414 DECLARE_WAITQUEUE(wait, current);
1415
1416 add_wait_queue(&km_waitq, &wait);
1417 set_current_state(TASK_INTERRUPTIBLE);
1418 schedule();
1419 set_current_state(TASK_RUNNING);
1420 remove_wait_queue(&km_waitq, &wait);
1421
1422 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1423
1424 if (nx == -EAGAIN && signal_pending(current)) {
1425 err = -ERESTART;
1426 goto error;
1427 }
1428 if (nx == -EAGAIN ||
1429 genid != atomic_read(&flow_cache_genid)) {
1430 xfrm_pols_put(pols, npols);
1431 goto restart;
1432 }
1433 err = nx;
1434 }
1435 if (err < 0)
1436 goto error;
1437 }
1438 if (nx == 0) {
1439 /* Flow passes not transformed. */
1440 xfrm_pols_put(pols, npols);
1441 return 0;
1442 }
1443
1444 dst = dst_orig;
1445 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1446
1447 if (unlikely(err)) {
1448 int i;
1449 for (i=0; i<nx; i++)
1450 xfrm_state_put(xfrm[i]);
1451 goto error;
1452 }
1453
1454 for (pi = 0; pi < npols; pi++) {
1455 read_lock_bh(&pols[pi]->lock);
1456 pol_dead |= pols[pi]->dead;
1457 read_unlock_bh(&pols[pi]->lock);
1458 }
1459
1460 write_lock_bh(&policy->lock);
1461 if (unlikely(pol_dead || stale_bundle(dst))) {
1462 /* Wow! While we worked on resolving, this
1463 * policy has gone. Retry. It is not paranoia,
1464 * we just cannot enlist new bundle to dead object.
1465 * We can't enlist stable bundles either.
1466 */
1467 write_unlock_bh(&policy->lock);
1468 if (dst)
1469 dst_free(dst);
1470
1471 err = -EHOSTUNREACH;
1472 goto error;
1473 }
1474 dst->next = policy->bundles;
1475 policy->bundles = dst;
1476 dst_hold(dst);
1477 write_unlock_bh(&policy->lock);
1478 }
1479 *dst_p = dst;
1480 dst_release(dst_orig);
1481 xfrm_pols_put(pols, npols);
1482 return 0;
1483
1484 error:
1485 dst_release(dst_orig);
1486 xfrm_pols_put(pols, npols);
1487 *dst_p = NULL;
1488 return err;
1489 }
1490 EXPORT_SYMBOL(xfrm_lookup);
1491
1492 static inline int
1493 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1494 {
1495 struct xfrm_state *x;
1496 int err;
1497
1498 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1499 return 0;
1500 x = skb->sp->xvec[idx];
1501 if (!x->type->reject)
1502 return 0;
1503 xfrm_state_hold(x);
1504 err = x->type->reject(x, skb, fl);
1505 xfrm_state_put(x);
1506 return err;
1507 }
1508
1509 /* When skb is transformed back to its "native" form, we have to
1510 * check policy restrictions. At the moment we make this in maximally
1511 * stupid way. Shame on me. :-) Of course, connected sockets must
1512 * have policy cached at them.
1513 */
1514
1515 static inline int
1516 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1517 unsigned short family)
1518 {
1519 if (xfrm_state_kern(x))
1520 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
1521 return x->id.proto == tmpl->id.proto &&
1522 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1523 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1524 x->props.mode == tmpl->mode &&
1525 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1526 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1527 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1528 xfrm_state_addr_cmp(tmpl, x, family));
1529 }
1530
1531 /*
1532 * 0 or more than 0 is returned when validation is succeeded (either bypass
1533 * because of optional transport mode, or next index of the mathced secpath
1534 * state with the template.
1535 * -1 is returned when no matching template is found.
1536 * Otherwise "-2 - errored_index" is returned.
1537 */
1538 static inline int
1539 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1540 unsigned short family)
1541 {
1542 int idx = start;
1543
1544 if (tmpl->optional) {
1545 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1546 return start;
1547 } else
1548 start = -1;
1549 for (; idx < sp->len; idx++) {
1550 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1551 return ++idx;
1552 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1553 if (start == -1)
1554 start = -2-idx;
1555 break;
1556 }
1557 }
1558 return start;
1559 }
1560
1561 int
1562 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1563 {
1564 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1565 int err;
1566
1567 if (unlikely(afinfo == NULL))
1568 return -EAFNOSUPPORT;
1569
1570 afinfo->decode_session(skb, fl);
1571 err = security_xfrm_decode_session(skb, &fl->secid);
1572 xfrm_policy_put_afinfo(afinfo);
1573 return err;
1574 }
1575 EXPORT_SYMBOL(xfrm_decode_session);
1576
1577 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1578 {
1579 for (; k < sp->len; k++) {
1580 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1581 *idxp = k;
1582 return 1;
1583 }
1584 }
1585
1586 return 0;
1587 }
1588
1589 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1590 unsigned short family)
1591 {
1592 struct xfrm_policy *pol;
1593 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1594 int npols = 0;
1595 int xfrm_nr;
1596 int pi;
1597 struct flowi fl;
1598 u8 fl_dir = policy_to_flow_dir(dir);
1599 int xerr_idx = -1;
1600
1601 if (xfrm_decode_session(skb, &fl, family) < 0)
1602 return 0;
1603 nf_nat_decode_session(skb, &fl, family);
1604
1605 /* First, check used SA against their selectors. */
1606 if (skb->sp) {
1607 int i;
1608
1609 for (i=skb->sp->len-1; i>=0; i--) {
1610 struct xfrm_state *x = skb->sp->xvec[i];
1611 if (!xfrm_selector_match(&x->sel, &fl, family))
1612 return 0;
1613 }
1614 }
1615
1616 pol = NULL;
1617 if (sk && sk->sk_policy[dir]) {
1618 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1619 if (IS_ERR(pol))
1620 return 0;
1621 }
1622
1623 if (!pol)
1624 pol = flow_cache_lookup(&fl, family, fl_dir,
1625 xfrm_policy_lookup);
1626
1627 if (IS_ERR(pol))
1628 return 0;
1629
1630 if (!pol) {
1631 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1632 xfrm_secpath_reject(xerr_idx, skb, &fl);
1633 return 0;
1634 }
1635 return 1;
1636 }
1637
1638 pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1639
1640 pols[0] = pol;
1641 npols ++;
1642 #ifdef CONFIG_XFRM_SUB_POLICY
1643 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1644 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1645 &fl, family,
1646 XFRM_POLICY_IN);
1647 if (pols[1]) {
1648 if (IS_ERR(pols[1]))
1649 return 0;
1650 pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
1651 npols ++;
1652 }
1653 }
1654 #endif
1655
1656 if (pol->action == XFRM_POLICY_ALLOW) {
1657 struct sec_path *sp;
1658 static struct sec_path dummy;
1659 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1660 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1661 struct xfrm_tmpl **tpp = tp;
1662 int ti = 0;
1663 int i, k;
1664
1665 if ((sp = skb->sp) == NULL)
1666 sp = &dummy;
1667
1668 for (pi = 0; pi < npols; pi++) {
1669 if (pols[pi] != pol &&
1670 pols[pi]->action != XFRM_POLICY_ALLOW)
1671 goto reject;
1672 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1673 goto reject_error;
1674 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1675 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1676 }
1677 xfrm_nr = ti;
1678 if (npols > 1) {
1679 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1680 tpp = stp;
1681 }
1682
1683 /* For each tunnel xfrm, find the first matching tmpl.
1684 * For each tmpl before that, find corresponding xfrm.
1685 * Order is _important_. Later we will implement
1686 * some barriers, but at the moment barriers
1687 * are implied between each two transformations.
1688 */
1689 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1690 k = xfrm_policy_ok(tpp[i], sp, k, family);
1691 if (k < 0) {
1692 if (k < -1)
1693 /* "-2 - errored_index" returned */
1694 xerr_idx = -(2+k);
1695 goto reject;
1696 }
1697 }
1698
1699 if (secpath_has_nontransport(sp, k, &xerr_idx))
1700 goto reject;
1701
1702 xfrm_pols_put(pols, npols);
1703 return 1;
1704 }
1705
1706 reject:
1707 xfrm_secpath_reject(xerr_idx, skb, &fl);
1708 reject_error:
1709 xfrm_pols_put(pols, npols);
1710 return 0;
1711 }
1712 EXPORT_SYMBOL(__xfrm_policy_check);
1713
1714 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1715 {
1716 struct flowi fl;
1717
1718 if (xfrm_decode_session(skb, &fl, family) < 0)
1719 return 0;
1720
1721 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1722 }
1723 EXPORT_SYMBOL(__xfrm_route_forward);
1724
1725 /* Optimize later using cookies and generation ids. */
1726
1727 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1728 {
1729 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1730 * to "-1" to force all XFRM destinations to get validated by
1731 * dst_ops->check on every use. We do this because when a
1732 * normal route referenced by an XFRM dst is obsoleted we do
1733 * not go looking around for all parent referencing XFRM dsts
1734 * so that we can invalidate them. It is just too much work.
1735 * Instead we make the checks here on every use. For example:
1736 *
1737 * XFRM dst A --> IPv4 dst X
1738 *
1739 * X is the "xdst->route" of A (X is also the "dst->path" of A
1740 * in this example). If X is marked obsolete, "A" will not
1741 * notice. That's what we are validating here via the
1742 * stale_bundle() check.
1743 *
1744 * When a policy's bundle is pruned, we dst_free() the XFRM
1745 * dst which causes it's ->obsolete field to be set to a
1746 * positive non-zero integer. If an XFRM dst has been pruned
1747 * like this, we want to force a new route lookup.
1748 */
1749 if (dst->obsolete < 0 && !stale_bundle(dst))
1750 return dst;
1751
1752 return NULL;
1753 }
1754
1755 static int stale_bundle(struct dst_entry *dst)
1756 {
1757 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1758 }
1759
1760 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1761 {
1762 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1763 dst->dev = &loopback_dev;
1764 dev_hold(&loopback_dev);
1765 dev_put(dev);
1766 }
1767 }
1768 EXPORT_SYMBOL(xfrm_dst_ifdown);
1769
1770 static void xfrm_link_failure(struct sk_buff *skb)
1771 {
1772 /* Impossible. Such dst must be popped before reaches point of failure. */
1773 return;
1774 }
1775
1776 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1777 {
1778 if (dst) {
1779 if (dst->obsolete) {
1780 dst_release(dst);
1781 dst = NULL;
1782 }
1783 }
1784 return dst;
1785 }
1786
1787 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1788 {
1789 struct dst_entry *dst, **dstp;
1790
1791 write_lock(&pol->lock);
1792 dstp = &pol->bundles;
1793 while ((dst=*dstp) != NULL) {
1794 if (func(dst)) {
1795 *dstp = dst->next;
1796 dst->next = *gc_list_p;
1797 *gc_list_p = dst;
1798 } else {
1799 dstp = &dst->next;
1800 }
1801 }
1802 write_unlock(&pol->lock);
1803 }
1804
1805 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1806 {
1807 struct dst_entry *gc_list = NULL;
1808 int dir;
1809
1810 read_lock_bh(&xfrm_policy_lock);
1811 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1812 struct xfrm_policy *pol;
1813 struct hlist_node *entry;
1814 struct hlist_head *table;
1815 int i;
1816
1817 hlist_for_each_entry(pol, entry,
1818 &xfrm_policy_inexact[dir], bydst)
1819 prune_one_bundle(pol, func, &gc_list);
1820
1821 table = xfrm_policy_bydst[dir].table;
1822 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1823 hlist_for_each_entry(pol, entry, table + i, bydst)
1824 prune_one_bundle(pol, func, &gc_list);
1825 }
1826 }
1827 read_unlock_bh(&xfrm_policy_lock);
1828
1829 while (gc_list) {
1830 struct dst_entry *dst = gc_list;
1831 gc_list = dst->next;
1832 dst_free(dst);
1833 }
1834 }
1835
1836 static int unused_bundle(struct dst_entry *dst)
1837 {
1838 return !atomic_read(&dst->__refcnt);
1839 }
1840
1841 static void __xfrm_garbage_collect(void)
1842 {
1843 xfrm_prune_bundles(unused_bundle);
1844 }
1845
1846 static int xfrm_flush_bundles(void)
1847 {
1848 xfrm_prune_bundles(stale_bundle);
1849 return 0;
1850 }
1851
1852 void xfrm_init_pmtu(struct dst_entry *dst)
1853 {
1854 do {
1855 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1856 u32 pmtu, route_mtu_cached;
1857
1858 pmtu = dst_mtu(dst->child);
1859 xdst->child_mtu_cached = pmtu;
1860
1861 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1862
1863 route_mtu_cached = dst_mtu(xdst->route);
1864 xdst->route_mtu_cached = route_mtu_cached;
1865
1866 if (pmtu > route_mtu_cached)
1867 pmtu = route_mtu_cached;
1868
1869 dst->metrics[RTAX_MTU-1] = pmtu;
1870 } while ((dst = dst->next));
1871 }
1872
1873 EXPORT_SYMBOL(xfrm_init_pmtu);
1874
1875 /* Check that the bundle accepts the flow and its components are
1876 * still valid.
1877 */
1878
1879 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
1880 struct flowi *fl, int family, int strict)
1881 {
1882 struct dst_entry *dst = &first->u.dst;
1883 struct xfrm_dst *last;
1884 u32 mtu;
1885
1886 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1887 (dst->dev && !netif_running(dst->dev)))
1888 return 0;
1889
1890 last = NULL;
1891
1892 do {
1893 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1894
1895 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1896 return 0;
1897 if (fl && !security_xfrm_flow_state_match(fl, dst->xfrm, pol))
1898 return 0;
1899 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1900 return 0;
1901 if (xdst->genid != dst->xfrm->genid)
1902 return 0;
1903
1904 if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
1905 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
1906 return 0;
1907
1908 mtu = dst_mtu(dst->child);
1909 if (xdst->child_mtu_cached != mtu) {
1910 last = xdst;
1911 xdst->child_mtu_cached = mtu;
1912 }
1913
1914 if (!dst_check(xdst->route, xdst->route_cookie))
1915 return 0;
1916 mtu = dst_mtu(xdst->route);
1917 if (xdst->route_mtu_cached != mtu) {
1918 last = xdst;
1919 xdst->route_mtu_cached = mtu;
1920 }
1921
1922 dst = dst->child;
1923 } while (dst->xfrm);
1924
1925 if (likely(!last))
1926 return 1;
1927
1928 mtu = last->child_mtu_cached;
1929 for (;;) {
1930 dst = &last->u.dst;
1931
1932 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1933 if (mtu > last->route_mtu_cached)
1934 mtu = last->route_mtu_cached;
1935 dst->metrics[RTAX_MTU-1] = mtu;
1936
1937 if (last == first)
1938 break;
1939
1940 last = last->u.next;
1941 last->child_mtu_cached = mtu;
1942 }
1943
1944 return 1;
1945 }
1946
1947 EXPORT_SYMBOL(xfrm_bundle_ok);
1948
1949 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1950 {
1951 int err = 0;
1952 if (unlikely(afinfo == NULL))
1953 return -EINVAL;
1954 if (unlikely(afinfo->family >= NPROTO))
1955 return -EAFNOSUPPORT;
1956 write_lock_bh(&xfrm_policy_afinfo_lock);
1957 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1958 err = -ENOBUFS;
1959 else {
1960 struct dst_ops *dst_ops = afinfo->dst_ops;
1961 if (likely(dst_ops->kmem_cachep == NULL))
1962 dst_ops->kmem_cachep = xfrm_dst_cache;
1963 if (likely(dst_ops->check == NULL))
1964 dst_ops->check = xfrm_dst_check;
1965 if (likely(dst_ops->negative_advice == NULL))
1966 dst_ops->negative_advice = xfrm_negative_advice;
1967 if (likely(dst_ops->link_failure == NULL))
1968 dst_ops->link_failure = xfrm_link_failure;
1969 if (likely(afinfo->garbage_collect == NULL))
1970 afinfo->garbage_collect = __xfrm_garbage_collect;
1971 xfrm_policy_afinfo[afinfo->family] = afinfo;
1972 }
1973 write_unlock_bh(&xfrm_policy_afinfo_lock);
1974 return err;
1975 }
1976 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
1977
1978 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
1979 {
1980 int err = 0;
1981 if (unlikely(afinfo == NULL))
1982 return -EINVAL;
1983 if (unlikely(afinfo->family >= NPROTO))
1984 return -EAFNOSUPPORT;
1985 write_lock_bh(&xfrm_policy_afinfo_lock);
1986 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
1987 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
1988 err = -EINVAL;
1989 else {
1990 struct dst_ops *dst_ops = afinfo->dst_ops;
1991 xfrm_policy_afinfo[afinfo->family] = NULL;
1992 dst_ops->kmem_cachep = NULL;
1993 dst_ops->check = NULL;
1994 dst_ops->negative_advice = NULL;
1995 dst_ops->link_failure = NULL;
1996 afinfo->garbage_collect = NULL;
1997 }
1998 }
1999 write_unlock_bh(&xfrm_policy_afinfo_lock);
2000 return err;
2001 }
2002 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2003
2004 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2005 {
2006 struct xfrm_policy_afinfo *afinfo;
2007 if (unlikely(family >= NPROTO))
2008 return NULL;
2009 read_lock(&xfrm_policy_afinfo_lock);
2010 afinfo = xfrm_policy_afinfo[family];
2011 if (unlikely(!afinfo))
2012 read_unlock(&xfrm_policy_afinfo_lock);
2013 return afinfo;
2014 }
2015
2016 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2017 {
2018 read_unlock(&xfrm_policy_afinfo_lock);
2019 }
2020
2021 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
2022 {
2023 struct xfrm_policy_afinfo *afinfo;
2024 if (unlikely(family >= NPROTO))
2025 return NULL;
2026 write_lock_bh(&xfrm_policy_afinfo_lock);
2027 afinfo = xfrm_policy_afinfo[family];
2028 if (unlikely(!afinfo))
2029 write_unlock_bh(&xfrm_policy_afinfo_lock);
2030 return afinfo;
2031 }
2032
2033 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
2034 {
2035 write_unlock_bh(&xfrm_policy_afinfo_lock);
2036 }
2037
2038 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2039 {
2040 switch (event) {
2041 case NETDEV_DOWN:
2042 xfrm_flush_bundles();
2043 }
2044 return NOTIFY_DONE;
2045 }
2046
2047 static struct notifier_block xfrm_dev_notifier = {
2048 xfrm_dev_event,
2049 NULL,
2050 0
2051 };
2052
2053 static void __init xfrm_policy_init(void)
2054 {
2055 unsigned int hmask, sz;
2056 int dir;
2057
2058 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2059 sizeof(struct xfrm_dst),
2060 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2061 NULL, NULL);
2062
2063 hmask = 8 - 1;
2064 sz = (hmask+1) * sizeof(struct hlist_head);
2065
2066 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2067 xfrm_idx_hmask = hmask;
2068 if (!xfrm_policy_byidx)
2069 panic("XFRM: failed to allocate byidx hash\n");
2070
2071 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2072 struct xfrm_policy_hash *htab;
2073
2074 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2075
2076 htab = &xfrm_policy_bydst[dir];
2077 htab->table = xfrm_hash_alloc(sz);
2078 htab->hmask = hmask;
2079 if (!htab->table)
2080 panic("XFRM: failed to allocate bydst hash\n");
2081 }
2082
2083 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL);
2084 register_netdevice_notifier(&xfrm_dev_notifier);
2085 }
2086
2087 void __init xfrm_init(void)
2088 {
2089 xfrm_state_init();
2090 xfrm_policy_init();
2091 xfrm_input_init();
2092 }
2093
Linus' kernel tree