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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[mirror_ubuntu-zesty-kernel.git] / net / xfrm / xfrm_policy.c
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 static inline int
54 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
55 {
56 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
57 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
58 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
59 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
60 (fl->proto == sel->proto || !sel->proto) &&
61 (fl->oif == sel->ifindex || !sel->ifindex);
62 }
63
64 static inline int
65 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
66 {
67 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
68 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
69 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
70 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
71 (fl->proto == sel->proto || !sel->proto) &&
72 (fl->oif == sel->ifindex || !sel->ifindex);
73 }
74
75 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
76 unsigned short family)
77 {
78 switch (family) {
79 case AF_INET:
80 return __xfrm4_selector_match(sel, fl);
81 case AF_INET6:
82 return __xfrm6_selector_match(sel, fl);
83 }
84 return 0;
85 }
86
87 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
88 {
89 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
90 struct xfrm_type **typemap;
91 int err = 0;
92
93 if (unlikely(afinfo == NULL))
94 return -EAFNOSUPPORT;
95 typemap = afinfo->type_map;
96
97 if (likely(typemap[type->proto] == NULL))
98 typemap[type->proto] = type;
99 else
100 err = -EEXIST;
101 xfrm_policy_unlock_afinfo(afinfo);
102 return err;
103 }
104 EXPORT_SYMBOL(xfrm_register_type);
105
106 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
107 {
108 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
109 struct xfrm_type **typemap;
110 int err = 0;
111
112 if (unlikely(afinfo == NULL))
113 return -EAFNOSUPPORT;
114 typemap = afinfo->type_map;
115
116 if (unlikely(typemap[type->proto] != type))
117 err = -ENOENT;
118 else
119 typemap[type->proto] = NULL;
120 xfrm_policy_unlock_afinfo(afinfo);
121 return err;
122 }
123 EXPORT_SYMBOL(xfrm_unregister_type);
124
125 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
126 {
127 struct xfrm_policy_afinfo *afinfo;
128 struct xfrm_type **typemap;
129 struct xfrm_type *type;
130 int modload_attempted = 0;
131
132 retry:
133 afinfo = xfrm_policy_get_afinfo(family);
134 if (unlikely(afinfo == NULL))
135 return NULL;
136 typemap = afinfo->type_map;
137
138 type = typemap[proto];
139 if (unlikely(type && !try_module_get(type->owner)))
140 type = NULL;
141 if (!type && !modload_attempted) {
142 xfrm_policy_put_afinfo(afinfo);
143 request_module("xfrm-type-%d-%d",
144 (int) family, (int) proto);
145 modload_attempted = 1;
146 goto retry;
147 }
148
149 xfrm_policy_put_afinfo(afinfo);
150 return type;
151 }
152
153 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
154 unsigned short family)
155 {
156 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
157 int err = 0;
158
159 if (unlikely(afinfo == NULL))
160 return -EAFNOSUPPORT;
161
162 if (likely(afinfo->dst_lookup != NULL))
163 err = afinfo->dst_lookup(dst, fl);
164 else
165 err = -EINVAL;
166 xfrm_policy_put_afinfo(afinfo);
167 return err;
168 }
169 EXPORT_SYMBOL(xfrm_dst_lookup);
170
171 void xfrm_put_type(struct xfrm_type *type)
172 {
173 module_put(type->owner);
174 }
175
176 int xfrm_register_mode(struct xfrm_mode *mode, int family)
177 {
178 struct xfrm_policy_afinfo *afinfo;
179 struct xfrm_mode **modemap;
180 int err;
181
182 if (unlikely(mode->encap >= XFRM_MODE_MAX))
183 return -EINVAL;
184
185 afinfo = xfrm_policy_lock_afinfo(family);
186 if (unlikely(afinfo == NULL))
187 return -EAFNOSUPPORT;
188
189 err = -EEXIST;
190 modemap = afinfo->mode_map;
191 if (likely(modemap[mode->encap] == NULL)) {
192 modemap[mode->encap] = mode;
193 err = 0;
194 }
195
196 xfrm_policy_unlock_afinfo(afinfo);
197 return err;
198 }
199 EXPORT_SYMBOL(xfrm_register_mode);
200
201 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
202 {
203 struct xfrm_policy_afinfo *afinfo;
204 struct xfrm_mode **modemap;
205 int err;
206
207 if (unlikely(mode->encap >= XFRM_MODE_MAX))
208 return -EINVAL;
209
210 afinfo = xfrm_policy_lock_afinfo(family);
211 if (unlikely(afinfo == NULL))
212 return -EAFNOSUPPORT;
213
214 err = -ENOENT;
215 modemap = afinfo->mode_map;
216 if (likely(modemap[mode->encap] == mode)) {
217 modemap[mode->encap] = NULL;
218 err = 0;
219 }
220
221 xfrm_policy_unlock_afinfo(afinfo);
222 return err;
223 }
224 EXPORT_SYMBOL(xfrm_unregister_mode);
225
226 struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
227 {
228 struct xfrm_policy_afinfo *afinfo;
229 struct xfrm_mode *mode;
230 int modload_attempted = 0;
231
232 if (unlikely(encap >= XFRM_MODE_MAX))
233 return NULL;
234
235 retry:
236 afinfo = xfrm_policy_get_afinfo(family);
237 if (unlikely(afinfo == NULL))
238 return NULL;
239
240 mode = afinfo->mode_map[encap];
241 if (unlikely(mode && !try_module_get(mode->owner)))
242 mode = NULL;
243 if (!mode && !modload_attempted) {
244 xfrm_policy_put_afinfo(afinfo);
245 request_module("xfrm-mode-%d-%d", family, encap);
246 modload_attempted = 1;
247 goto retry;
248 }
249
250 xfrm_policy_put_afinfo(afinfo);
251 return mode;
252 }
253
254 void xfrm_put_mode(struct xfrm_mode *mode)
255 {
256 module_put(mode->owner);
257 }
258
259 static inline unsigned long make_jiffies(long secs)
260 {
261 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
262 return MAX_SCHEDULE_TIMEOUT-1;
263 else
264 return secs*HZ;
265 }
266
267 static void xfrm_policy_timer(unsigned long data)
268 {
269 struct xfrm_policy *xp = (struct xfrm_policy*)data;
270 unsigned long now = (unsigned long)xtime.tv_sec;
271 long next = LONG_MAX;
272 int warn = 0;
273 int dir;
274
275 read_lock(&xp->lock);
276
277 if (xp->dead)
278 goto out;
279
280 dir = xfrm_policy_id2dir(xp->index);
281
282 if (xp->lft.hard_add_expires_seconds) {
283 long tmo = xp->lft.hard_add_expires_seconds +
284 xp->curlft.add_time - now;
285 if (tmo <= 0)
286 goto expired;
287 if (tmo < next)
288 next = tmo;
289 }
290 if (xp->lft.hard_use_expires_seconds) {
291 long tmo = xp->lft.hard_use_expires_seconds +
292 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
293 if (tmo <= 0)
294 goto expired;
295 if (tmo < next)
296 next = tmo;
297 }
298 if (xp->lft.soft_add_expires_seconds) {
299 long tmo = xp->lft.soft_add_expires_seconds +
300 xp->curlft.add_time - now;
301 if (tmo <= 0) {
302 warn = 1;
303 tmo = XFRM_KM_TIMEOUT;
304 }
305 if (tmo < next)
306 next = tmo;
307 }
308 if (xp->lft.soft_use_expires_seconds) {
309 long tmo = xp->lft.soft_use_expires_seconds +
310 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
311 if (tmo <= 0) {
312 warn = 1;
313 tmo = XFRM_KM_TIMEOUT;
314 }
315 if (tmo < next)
316 next = tmo;
317 }
318
319 if (warn)
320 km_policy_expired(xp, dir, 0, 0);
321 if (next != LONG_MAX &&
322 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
323 xfrm_pol_hold(xp);
324
325 out:
326 read_unlock(&xp->lock);
327 xfrm_pol_put(xp);
328 return;
329
330 expired:
331 read_unlock(&xp->lock);
332 if (!xfrm_policy_delete(xp, dir))
333 km_policy_expired(xp, dir, 1, 0);
334 xfrm_pol_put(xp);
335 }
336
337
338 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
339 * SPD calls.
340 */
341
342 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
343 {
344 struct xfrm_policy *policy;
345
346 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
347
348 if (policy) {
349 INIT_HLIST_NODE(&policy->bydst);
350 INIT_HLIST_NODE(&policy->byidx);
351 rwlock_init(&policy->lock);
352 atomic_set(&policy->refcnt, 1);
353 init_timer(&policy->timer);
354 policy->timer.data = (unsigned long)policy;
355 policy->timer.function = xfrm_policy_timer;
356 }
357 return policy;
358 }
359 EXPORT_SYMBOL(xfrm_policy_alloc);
360
361 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
362
363 void __xfrm_policy_destroy(struct xfrm_policy *policy)
364 {
365 BUG_ON(!policy->dead);
366
367 BUG_ON(policy->bundles);
368
369 if (del_timer(&policy->timer))
370 BUG();
371
372 security_xfrm_policy_free(policy);
373 kfree(policy);
374 }
375 EXPORT_SYMBOL(__xfrm_policy_destroy);
376
377 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
378 {
379 struct dst_entry *dst;
380
381 while ((dst = policy->bundles) != NULL) {
382 policy->bundles = dst->next;
383 dst_free(dst);
384 }
385
386 if (del_timer(&policy->timer))
387 atomic_dec(&policy->refcnt);
388
389 if (atomic_read(&policy->refcnt) > 1)
390 flow_cache_flush();
391
392 xfrm_pol_put(policy);
393 }
394
395 static void xfrm_policy_gc_task(struct work_struct *work)
396 {
397 struct xfrm_policy *policy;
398 struct hlist_node *entry, *tmp;
399 struct hlist_head gc_list;
400
401 spin_lock_bh(&xfrm_policy_gc_lock);
402 gc_list.first = xfrm_policy_gc_list.first;
403 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
404 spin_unlock_bh(&xfrm_policy_gc_lock);
405
406 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
407 xfrm_policy_gc_kill(policy);
408 }
409
410 /* Rule must be locked. Release descentant resources, announce
411 * entry dead. The rule must be unlinked from lists to the moment.
412 */
413
414 static void xfrm_policy_kill(struct xfrm_policy *policy)
415 {
416 int dead;
417
418 write_lock_bh(&policy->lock);
419 dead = policy->dead;
420 policy->dead = 1;
421 write_unlock_bh(&policy->lock);
422
423 if (unlikely(dead)) {
424 WARN_ON(1);
425 return;
426 }
427
428 spin_lock(&xfrm_policy_gc_lock);
429 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
430 spin_unlock(&xfrm_policy_gc_lock);
431
432 schedule_work(&xfrm_policy_gc_work);
433 }
434
435 struct xfrm_policy_hash {
436 struct hlist_head *table;
437 unsigned int hmask;
438 };
439
440 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
441 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
442 static struct hlist_head *xfrm_policy_byidx __read_mostly;
443 static unsigned int xfrm_idx_hmask __read_mostly;
444 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
445
446 static inline unsigned int idx_hash(u32 index)
447 {
448 return __idx_hash(index, xfrm_idx_hmask);
449 }
450
451 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
452 {
453 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
454 unsigned int hash = __sel_hash(sel, family, hmask);
455
456 return (hash == hmask + 1 ?
457 &xfrm_policy_inexact[dir] :
458 xfrm_policy_bydst[dir].table + hash);
459 }
460
461 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
462 {
463 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
464 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
465
466 return xfrm_policy_bydst[dir].table + hash;
467 }
468
469 static void xfrm_dst_hash_transfer(struct hlist_head *list,
470 struct hlist_head *ndsttable,
471 unsigned int nhashmask)
472 {
473 struct hlist_node *entry, *tmp;
474 struct xfrm_policy *pol;
475
476 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
477 unsigned int h;
478
479 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
480 pol->family, nhashmask);
481 hlist_add_head(&pol->bydst, ndsttable+h);
482 }
483 }
484
485 static void xfrm_idx_hash_transfer(struct hlist_head *list,
486 struct hlist_head *nidxtable,
487 unsigned int nhashmask)
488 {
489 struct hlist_node *entry, *tmp;
490 struct xfrm_policy *pol;
491
492 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
493 unsigned int h;
494
495 h = __idx_hash(pol->index, nhashmask);
496 hlist_add_head(&pol->byidx, nidxtable+h);
497 }
498 }
499
500 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
501 {
502 return ((old_hmask + 1) << 1) - 1;
503 }
504
505 static void xfrm_bydst_resize(int dir)
506 {
507 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
508 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
509 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
510 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
511 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
512 int i;
513
514 if (!ndst)
515 return;
516
517 write_lock_bh(&xfrm_policy_lock);
518
519 for (i = hmask; i >= 0; i--)
520 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
521
522 xfrm_policy_bydst[dir].table = ndst;
523 xfrm_policy_bydst[dir].hmask = nhashmask;
524
525 write_unlock_bh(&xfrm_policy_lock);
526
527 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
528 }
529
530 static void xfrm_byidx_resize(int total)
531 {
532 unsigned int hmask = xfrm_idx_hmask;
533 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
534 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
535 struct hlist_head *oidx = xfrm_policy_byidx;
536 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
537 int i;
538
539 if (!nidx)
540 return;
541
542 write_lock_bh(&xfrm_policy_lock);
543
544 for (i = hmask; i >= 0; i--)
545 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
546
547 xfrm_policy_byidx = nidx;
548 xfrm_idx_hmask = nhashmask;
549
550 write_unlock_bh(&xfrm_policy_lock);
551
552 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
553 }
554
555 static inline int xfrm_bydst_should_resize(int dir, int *total)
556 {
557 unsigned int cnt = xfrm_policy_count[dir];
558 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
559
560 if (total)
561 *total += cnt;
562
563 if ((hmask + 1) < xfrm_policy_hashmax &&
564 cnt > hmask)
565 return 1;
566
567 return 0;
568 }
569
570 static inline int xfrm_byidx_should_resize(int total)
571 {
572 unsigned int hmask = xfrm_idx_hmask;
573
574 if ((hmask + 1) < xfrm_policy_hashmax &&
575 total > hmask)
576 return 1;
577
578 return 0;
579 }
580
581 static DEFINE_MUTEX(hash_resize_mutex);
582
583 static void xfrm_hash_resize(struct work_struct *__unused)
584 {
585 int dir, total;
586
587 mutex_lock(&hash_resize_mutex);
588
589 total = 0;
590 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
591 if (xfrm_bydst_should_resize(dir, &total))
592 xfrm_bydst_resize(dir);
593 }
594 if (xfrm_byidx_should_resize(total))
595 xfrm_byidx_resize(total);
596
597 mutex_unlock(&hash_resize_mutex);
598 }
599
600 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
601
602 /* Generate new index... KAME seems to generate them ordered by cost
603 * of an absolute inpredictability of ordering of rules. This will not pass. */
604 static u32 xfrm_gen_index(u8 type, int dir)
605 {
606 static u32 idx_generator;
607
608 for (;;) {
609 struct hlist_node *entry;
610 struct hlist_head *list;
611 struct xfrm_policy *p;
612 u32 idx;
613 int found;
614
615 idx = (idx_generator | dir);
616 idx_generator += 8;
617 if (idx == 0)
618 idx = 8;
619 list = xfrm_policy_byidx + idx_hash(idx);
620 found = 0;
621 hlist_for_each_entry(p, entry, list, byidx) {
622 if (p->index == idx) {
623 found = 1;
624 break;
625 }
626 }
627 if (!found)
628 return idx;
629 }
630 }
631
632 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
633 {
634 u32 *p1 = (u32 *) s1;
635 u32 *p2 = (u32 *) s2;
636 int len = sizeof(struct xfrm_selector) / sizeof(u32);
637 int i;
638
639 for (i = 0; i < len; i++) {
640 if (p1[i] != p2[i])
641 return 1;
642 }
643
644 return 0;
645 }
646
647 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
648 {
649 struct xfrm_policy *pol;
650 struct xfrm_policy *delpol;
651 struct hlist_head *chain;
652 struct hlist_node *entry, *newpos, *last;
653 struct dst_entry *gc_list;
654
655 write_lock_bh(&xfrm_policy_lock);
656 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
657 delpol = NULL;
658 newpos = NULL;
659 last = NULL;
660 hlist_for_each_entry(pol, entry, chain, bydst) {
661 if (!delpol &&
662 pol->type == policy->type &&
663 !selector_cmp(&pol->selector, &policy->selector) &&
664 xfrm_sec_ctx_match(pol->security, policy->security)) {
665 if (excl) {
666 write_unlock_bh(&xfrm_policy_lock);
667 return -EEXIST;
668 }
669 delpol = pol;
670 if (policy->priority > pol->priority)
671 continue;
672 } else if (policy->priority >= pol->priority) {
673 last = &pol->bydst;
674 continue;
675 }
676 if (!newpos)
677 newpos = &pol->bydst;
678 if (delpol)
679 break;
680 last = &pol->bydst;
681 }
682 if (!newpos)
683 newpos = last;
684 if (newpos)
685 hlist_add_after(newpos, &policy->bydst);
686 else
687 hlist_add_head(&policy->bydst, chain);
688 xfrm_pol_hold(policy);
689 xfrm_policy_count[dir]++;
690 atomic_inc(&flow_cache_genid);
691 if (delpol) {
692 hlist_del(&delpol->bydst);
693 hlist_del(&delpol->byidx);
694 xfrm_policy_count[dir]--;
695 }
696 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
697 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
698 policy->curlft.add_time = (unsigned long)xtime.tv_sec;
699 policy->curlft.use_time = 0;
700 if (!mod_timer(&policy->timer, jiffies + HZ))
701 xfrm_pol_hold(policy);
702 write_unlock_bh(&xfrm_policy_lock);
703
704 if (delpol)
705 xfrm_policy_kill(delpol);
706 else if (xfrm_bydst_should_resize(dir, NULL))
707 schedule_work(&xfrm_hash_work);
708
709 read_lock_bh(&xfrm_policy_lock);
710 gc_list = NULL;
711 entry = &policy->bydst;
712 hlist_for_each_entry_continue(policy, entry, bydst) {
713 struct dst_entry *dst;
714
715 write_lock(&policy->lock);
716 dst = policy->bundles;
717 if (dst) {
718 struct dst_entry *tail = dst;
719 while (tail->next)
720 tail = tail->next;
721 tail->next = gc_list;
722 gc_list = dst;
723
724 policy->bundles = NULL;
725 }
726 write_unlock(&policy->lock);
727 }
728 read_unlock_bh(&xfrm_policy_lock);
729
730 while (gc_list) {
731 struct dst_entry *dst = gc_list;
732
733 gc_list = dst->next;
734 dst_free(dst);
735 }
736
737 return 0;
738 }
739 EXPORT_SYMBOL(xfrm_policy_insert);
740
741 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
742 struct xfrm_selector *sel,
743 struct xfrm_sec_ctx *ctx, int delete)
744 {
745 struct xfrm_policy *pol, *ret;
746 struct hlist_head *chain;
747 struct hlist_node *entry;
748
749 write_lock_bh(&xfrm_policy_lock);
750 chain = policy_hash_bysel(sel, sel->family, dir);
751 ret = NULL;
752 hlist_for_each_entry(pol, entry, chain, bydst) {
753 if (pol->type == type &&
754 !selector_cmp(sel, &pol->selector) &&
755 xfrm_sec_ctx_match(ctx, pol->security)) {
756 xfrm_pol_hold(pol);
757 if (delete) {
758 hlist_del(&pol->bydst);
759 hlist_del(&pol->byidx);
760 xfrm_policy_count[dir]--;
761 }
762 ret = pol;
763 break;
764 }
765 }
766 write_unlock_bh(&xfrm_policy_lock);
767
768 if (ret && delete) {
769 atomic_inc(&flow_cache_genid);
770 xfrm_policy_kill(ret);
771 }
772 return ret;
773 }
774 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
775
776 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete)
777 {
778 struct xfrm_policy *pol, *ret;
779 struct hlist_head *chain;
780 struct hlist_node *entry;
781
782 write_lock_bh(&xfrm_policy_lock);
783 chain = xfrm_policy_byidx + idx_hash(id);
784 ret = NULL;
785 hlist_for_each_entry(pol, entry, chain, byidx) {
786 if (pol->type == type && pol->index == id) {
787 xfrm_pol_hold(pol);
788 if (delete) {
789 hlist_del(&pol->bydst);
790 hlist_del(&pol->byidx);
791 xfrm_policy_count[dir]--;
792 }
793 ret = pol;
794 break;
795 }
796 }
797 write_unlock_bh(&xfrm_policy_lock);
798
799 if (ret && delete) {
800 atomic_inc(&flow_cache_genid);
801 xfrm_policy_kill(ret);
802 }
803 return ret;
804 }
805 EXPORT_SYMBOL(xfrm_policy_byid);
806
807 void xfrm_policy_flush(u8 type)
808 {
809 int dir;
810
811 write_lock_bh(&xfrm_policy_lock);
812 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
813 struct xfrm_policy *pol;
814 struct hlist_node *entry;
815 int i, killed;
816
817 killed = 0;
818 again1:
819 hlist_for_each_entry(pol, entry,
820 &xfrm_policy_inexact[dir], bydst) {
821 if (pol->type != type)
822 continue;
823 hlist_del(&pol->bydst);
824 hlist_del(&pol->byidx);
825 write_unlock_bh(&xfrm_policy_lock);
826
827 xfrm_policy_kill(pol);
828 killed++;
829
830 write_lock_bh(&xfrm_policy_lock);
831 goto again1;
832 }
833
834 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
835 again2:
836 hlist_for_each_entry(pol, entry,
837 xfrm_policy_bydst[dir].table + i,
838 bydst) {
839 if (pol->type != type)
840 continue;
841 hlist_del(&pol->bydst);
842 hlist_del(&pol->byidx);
843 write_unlock_bh(&xfrm_policy_lock);
844
845 xfrm_policy_kill(pol);
846 killed++;
847
848 write_lock_bh(&xfrm_policy_lock);
849 goto again2;
850 }
851 }
852
853 xfrm_policy_count[dir] -= killed;
854 }
855 atomic_inc(&flow_cache_genid);
856 write_unlock_bh(&xfrm_policy_lock);
857 }
858 EXPORT_SYMBOL(xfrm_policy_flush);
859
860 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
861 void *data)
862 {
863 struct xfrm_policy *pol;
864 struct hlist_node *entry;
865 int dir, count, error;
866
867 read_lock_bh(&xfrm_policy_lock);
868 count = 0;
869 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
870 struct hlist_head *table = xfrm_policy_bydst[dir].table;
871 int i;
872
873 hlist_for_each_entry(pol, entry,
874 &xfrm_policy_inexact[dir], bydst) {
875 if (pol->type == type)
876 count++;
877 }
878 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
879 hlist_for_each_entry(pol, entry, table + i, bydst) {
880 if (pol->type == type)
881 count++;
882 }
883 }
884 }
885
886 if (count == 0) {
887 error = -ENOENT;
888 goto out;
889 }
890
891 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
892 struct hlist_head *table = xfrm_policy_bydst[dir].table;
893 int i;
894
895 hlist_for_each_entry(pol, entry,
896 &xfrm_policy_inexact[dir], bydst) {
897 if (pol->type != type)
898 continue;
899 error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
900 if (error)
901 goto out;
902 }
903 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
904 hlist_for_each_entry(pol, entry, table + i, bydst) {
905 if (pol->type != type)
906 continue;
907 error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
908 if (error)
909 goto out;
910 }
911 }
912 }
913 error = 0;
914 out:
915 read_unlock_bh(&xfrm_policy_lock);
916 return error;
917 }
918 EXPORT_SYMBOL(xfrm_policy_walk);
919
920 /*
921 * Find policy to apply to this flow.
922 *
923 * Returns 0 if policy found, else an -errno.
924 */
925 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
926 u8 type, u16 family, int dir)
927 {
928 struct xfrm_selector *sel = &pol->selector;
929 int match, ret = -ESRCH;
930
931 if (pol->family != family ||
932 pol->type != type)
933 return ret;
934
935 match = xfrm_selector_match(sel, fl, family);
936 if (match)
937 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
938
939 return ret;
940 }
941
942 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
943 u16 family, u8 dir)
944 {
945 int err;
946 struct xfrm_policy *pol, *ret;
947 xfrm_address_t *daddr, *saddr;
948 struct hlist_node *entry;
949 struct hlist_head *chain;
950 u32 priority = ~0U;
951
952 daddr = xfrm_flowi_daddr(fl, family);
953 saddr = xfrm_flowi_saddr(fl, family);
954 if (unlikely(!daddr || !saddr))
955 return NULL;
956
957 read_lock_bh(&xfrm_policy_lock);
958 chain = policy_hash_direct(daddr, saddr, family, dir);
959 ret = NULL;
960 hlist_for_each_entry(pol, entry, chain, bydst) {
961 err = xfrm_policy_match(pol, fl, type, family, dir);
962 if (err) {
963 if (err == -ESRCH)
964 continue;
965 else {
966 ret = ERR_PTR(err);
967 goto fail;
968 }
969 } else {
970 ret = pol;
971 priority = ret->priority;
972 break;
973 }
974 }
975 chain = &xfrm_policy_inexact[dir];
976 hlist_for_each_entry(pol, entry, chain, bydst) {
977 err = xfrm_policy_match(pol, fl, type, family, dir);
978 if (err) {
979 if (err == -ESRCH)
980 continue;
981 else {
982 ret = ERR_PTR(err);
983 goto fail;
984 }
985 } else if (pol->priority < priority) {
986 ret = pol;
987 break;
988 }
989 }
990 if (ret)
991 xfrm_pol_hold(ret);
992 fail:
993 read_unlock_bh(&xfrm_policy_lock);
994
995 return ret;
996 }
997
998 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
999 void **objp, atomic_t **obj_refp)
1000 {
1001 struct xfrm_policy *pol;
1002 int err = 0;
1003
1004 #ifdef CONFIG_XFRM_SUB_POLICY
1005 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
1006 if (IS_ERR(pol)) {
1007 err = PTR_ERR(pol);
1008 pol = NULL;
1009 }
1010 if (pol || err)
1011 goto end;
1012 #endif
1013 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1014 if (IS_ERR(pol)) {
1015 err = PTR_ERR(pol);
1016 pol = NULL;
1017 }
1018 #ifdef CONFIG_XFRM_SUB_POLICY
1019 end:
1020 #endif
1021 if ((*objp = (void *) pol) != NULL)
1022 *obj_refp = &pol->refcnt;
1023 return err;
1024 }
1025
1026 static inline int policy_to_flow_dir(int dir)
1027 {
1028 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1029 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1030 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1031 return dir;
1032 switch (dir) {
1033 default:
1034 case XFRM_POLICY_IN:
1035 return FLOW_DIR_IN;
1036 case XFRM_POLICY_OUT:
1037 return FLOW_DIR_OUT;
1038 case XFRM_POLICY_FWD:
1039 return FLOW_DIR_FWD;
1040 };
1041 }
1042
1043 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1044 {
1045 struct xfrm_policy *pol;
1046
1047 read_lock_bh(&xfrm_policy_lock);
1048 if ((pol = sk->sk_policy[dir]) != NULL) {
1049 int match = xfrm_selector_match(&pol->selector, fl,
1050 sk->sk_family);
1051 int err = 0;
1052
1053 if (match) {
1054 err = security_xfrm_policy_lookup(pol, fl->secid,
1055 policy_to_flow_dir(dir));
1056 if (!err)
1057 xfrm_pol_hold(pol);
1058 else if (err == -ESRCH)
1059 pol = NULL;
1060 else
1061 pol = ERR_PTR(err);
1062 } else
1063 pol = NULL;
1064 }
1065 read_unlock_bh(&xfrm_policy_lock);
1066 return pol;
1067 }
1068
1069 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1070 {
1071 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1072 pol->family, dir);
1073
1074 hlist_add_head(&pol->bydst, chain);
1075 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1076 xfrm_policy_count[dir]++;
1077 xfrm_pol_hold(pol);
1078
1079 if (xfrm_bydst_should_resize(dir, NULL))
1080 schedule_work(&xfrm_hash_work);
1081 }
1082
1083 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1084 int dir)
1085 {
1086 if (hlist_unhashed(&pol->bydst))
1087 return NULL;
1088
1089 hlist_del(&pol->bydst);
1090 hlist_del(&pol->byidx);
1091 xfrm_policy_count[dir]--;
1092
1093 return pol;
1094 }
1095
1096 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1097 {
1098 write_lock_bh(&xfrm_policy_lock);
1099 pol = __xfrm_policy_unlink(pol, dir);
1100 write_unlock_bh(&xfrm_policy_lock);
1101 if (pol) {
1102 if (dir < XFRM_POLICY_MAX)
1103 atomic_inc(&flow_cache_genid);
1104 xfrm_policy_kill(pol);
1105 return 0;
1106 }
1107 return -ENOENT;
1108 }
1109 EXPORT_SYMBOL(xfrm_policy_delete);
1110
1111 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1112 {
1113 struct xfrm_policy *old_pol;
1114
1115 #ifdef CONFIG_XFRM_SUB_POLICY
1116 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1117 return -EINVAL;
1118 #endif
1119
1120 write_lock_bh(&xfrm_policy_lock);
1121 old_pol = sk->sk_policy[dir];
1122 sk->sk_policy[dir] = pol;
1123 if (pol) {
1124 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
1125 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1126 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1127 }
1128 if (old_pol)
1129 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1130 write_unlock_bh(&xfrm_policy_lock);
1131
1132 if (old_pol) {
1133 xfrm_policy_kill(old_pol);
1134 }
1135 return 0;
1136 }
1137
1138 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1139 {
1140 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1141
1142 if (newp) {
1143 newp->selector = old->selector;
1144 if (security_xfrm_policy_clone(old, newp)) {
1145 kfree(newp);
1146 return NULL; /* ENOMEM */
1147 }
1148 newp->lft = old->lft;
1149 newp->curlft = old->curlft;
1150 newp->action = old->action;
1151 newp->flags = old->flags;
1152 newp->xfrm_nr = old->xfrm_nr;
1153 newp->index = old->index;
1154 newp->type = old->type;
1155 memcpy(newp->xfrm_vec, old->xfrm_vec,
1156 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1157 write_lock_bh(&xfrm_policy_lock);
1158 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1159 write_unlock_bh(&xfrm_policy_lock);
1160 xfrm_pol_put(newp);
1161 }
1162 return newp;
1163 }
1164
1165 int __xfrm_sk_clone_policy(struct sock *sk)
1166 {
1167 struct xfrm_policy *p0 = sk->sk_policy[0],
1168 *p1 = sk->sk_policy[1];
1169
1170 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1171 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1172 return -ENOMEM;
1173 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1174 return -ENOMEM;
1175 return 0;
1176 }
1177
1178 static int
1179 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1180 unsigned short family)
1181 {
1182 int err;
1183 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1184
1185 if (unlikely(afinfo == NULL))
1186 return -EINVAL;
1187 err = afinfo->get_saddr(local, remote);
1188 xfrm_policy_put_afinfo(afinfo);
1189 return err;
1190 }
1191
1192 /* Resolve list of templates for the flow, given policy. */
1193
1194 static int
1195 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1196 struct xfrm_state **xfrm,
1197 unsigned short family)
1198 {
1199 int nx;
1200 int i, error;
1201 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1202 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1203 xfrm_address_t tmp;
1204
1205 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1206 struct xfrm_state *x;
1207 xfrm_address_t *remote = daddr;
1208 xfrm_address_t *local = saddr;
1209 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1210
1211 if (tmpl->mode == XFRM_MODE_TUNNEL) {
1212 remote = &tmpl->id.daddr;
1213 local = &tmpl->saddr;
1214 family = tmpl->encap_family;
1215 if (xfrm_addr_any(local, family)) {
1216 error = xfrm_get_saddr(&tmp, remote, family);
1217 if (error)
1218 goto fail;
1219 local = &tmp;
1220 }
1221 }
1222
1223 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1224
1225 if (x && x->km.state == XFRM_STATE_VALID) {
1226 xfrm[nx++] = x;
1227 daddr = remote;
1228 saddr = local;
1229 continue;
1230 }
1231 if (x) {
1232 error = (x->km.state == XFRM_STATE_ERROR ?
1233 -EINVAL : -EAGAIN);
1234 xfrm_state_put(x);
1235 }
1236
1237 if (!tmpl->optional)
1238 goto fail;
1239 }
1240 return nx;
1241
1242 fail:
1243 for (nx--; nx>=0; nx--)
1244 xfrm_state_put(xfrm[nx]);
1245 return error;
1246 }
1247
1248 static int
1249 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1250 struct xfrm_state **xfrm,
1251 unsigned short family)
1252 {
1253 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1254 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1255 int cnx = 0;
1256 int error;
1257 int ret;
1258 int i;
1259
1260 for (i = 0; i < npols; i++) {
1261 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1262 error = -ENOBUFS;
1263 goto fail;
1264 }
1265
1266 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1267 if (ret < 0) {
1268 error = ret;
1269 goto fail;
1270 } else
1271 cnx += ret;
1272 }
1273
1274 /* found states are sorted for outbound processing */
1275 if (npols > 1)
1276 xfrm_state_sort(xfrm, tpp, cnx, family);
1277
1278 return cnx;
1279
1280 fail:
1281 for (cnx--; cnx>=0; cnx--)
1282 xfrm_state_put(tpp[cnx]);
1283 return error;
1284
1285 }
1286
1287 /* Check that the bundle accepts the flow and its components are
1288 * still valid.
1289 */
1290
1291 static struct dst_entry *
1292 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1293 {
1294 struct dst_entry *x;
1295 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1296 if (unlikely(afinfo == NULL))
1297 return ERR_PTR(-EINVAL);
1298 x = afinfo->find_bundle(fl, policy);
1299 xfrm_policy_put_afinfo(afinfo);
1300 return x;
1301 }
1302
1303 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1304 * all the metrics... Shortly, bundle a bundle.
1305 */
1306
1307 static int
1308 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1309 struct flowi *fl, struct dst_entry **dst_p,
1310 unsigned short family)
1311 {
1312 int err;
1313 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1314 if (unlikely(afinfo == NULL))
1315 return -EINVAL;
1316 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1317 xfrm_policy_put_afinfo(afinfo);
1318 return err;
1319 }
1320
1321
1322 static int stale_bundle(struct dst_entry *dst);
1323
1324 /* Main function: finds/creates a bundle for given flow.
1325 *
1326 * At the moment we eat a raw IP route. Mostly to speed up lookups
1327 * on interfaces with disabled IPsec.
1328 */
1329 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1330 struct sock *sk, int flags)
1331 {
1332 struct xfrm_policy *policy;
1333 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1334 int npols;
1335 int pol_dead;
1336 int xfrm_nr;
1337 int pi;
1338 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1339 struct dst_entry *dst, *dst_orig = *dst_p;
1340 int nx = 0;
1341 int err;
1342 u32 genid;
1343 u16 family;
1344 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1345
1346 restart:
1347 genid = atomic_read(&flow_cache_genid);
1348 policy = NULL;
1349 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1350 pols[pi] = NULL;
1351 npols = 0;
1352 pol_dead = 0;
1353 xfrm_nr = 0;
1354
1355 if (sk && sk->sk_policy[1]) {
1356 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1357 if (IS_ERR(policy))
1358 return PTR_ERR(policy);
1359 }
1360
1361 if (!policy) {
1362 /* To accelerate a bit... */
1363 if ((dst_orig->flags & DST_NOXFRM) ||
1364 !xfrm_policy_count[XFRM_POLICY_OUT])
1365 return 0;
1366
1367 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1368 dir, xfrm_policy_lookup);
1369 if (IS_ERR(policy))
1370 return PTR_ERR(policy);
1371 }
1372
1373 if (!policy)
1374 return 0;
1375
1376 family = dst_orig->ops->family;
1377 policy->curlft.use_time = (unsigned long)xtime.tv_sec;
1378 pols[0] = policy;
1379 npols ++;
1380 xfrm_nr += pols[0]->xfrm_nr;
1381
1382 switch (policy->action) {
1383 case XFRM_POLICY_BLOCK:
1384 /* Prohibit the flow */
1385 err = -EPERM;
1386 goto error;
1387
1388 case XFRM_POLICY_ALLOW:
1389 #ifndef CONFIG_XFRM_SUB_POLICY
1390 if (policy->xfrm_nr == 0) {
1391 /* Flow passes not transformed. */
1392 xfrm_pol_put(policy);
1393 return 0;
1394 }
1395 #endif
1396
1397 /* Try to find matching bundle.
1398 *
1399 * LATER: help from flow cache. It is optional, this
1400 * is required only for output policy.
1401 */
1402 dst = xfrm_find_bundle(fl, policy, family);
1403 if (IS_ERR(dst)) {
1404 err = PTR_ERR(dst);
1405 goto error;
1406 }
1407
1408 if (dst)
1409 break;
1410
1411 #ifdef CONFIG_XFRM_SUB_POLICY
1412 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1413 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1414 fl, family,
1415 XFRM_POLICY_OUT);
1416 if (pols[1]) {
1417 if (IS_ERR(pols[1])) {
1418 err = PTR_ERR(pols[1]);
1419 goto error;
1420 }
1421 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1422 err = -EPERM;
1423 goto error;
1424 }
1425 npols ++;
1426 xfrm_nr += pols[1]->xfrm_nr;
1427 }
1428 }
1429
1430 /*
1431 * Because neither flowi nor bundle information knows about
1432 * transformation template size. On more than one policy usage
1433 * we can realize whether all of them is bypass or not after
1434 * they are searched. See above not-transformed bypass
1435 * is surrounded by non-sub policy configuration, too.
1436 */
1437 if (xfrm_nr == 0) {
1438 /* Flow passes not transformed. */
1439 xfrm_pols_put(pols, npols);
1440 return 0;
1441 }
1442
1443 #endif
1444 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1445
1446 if (unlikely(nx<0)) {
1447 err = nx;
1448 if (err == -EAGAIN && flags) {
1449 DECLARE_WAITQUEUE(wait, current);
1450
1451 add_wait_queue(&km_waitq, &wait);
1452 set_current_state(TASK_INTERRUPTIBLE);
1453 schedule();
1454 set_current_state(TASK_RUNNING);
1455 remove_wait_queue(&km_waitq, &wait);
1456
1457 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1458
1459 if (nx == -EAGAIN && signal_pending(current)) {
1460 err = -ERESTART;
1461 goto error;
1462 }
1463 if (nx == -EAGAIN ||
1464 genid != atomic_read(&flow_cache_genid)) {
1465 xfrm_pols_put(pols, npols);
1466 goto restart;
1467 }
1468 err = nx;
1469 }
1470 if (err < 0)
1471 goto error;
1472 }
1473 if (nx == 0) {
1474 /* Flow passes not transformed. */
1475 xfrm_pols_put(pols, npols);
1476 return 0;
1477 }
1478
1479 dst = dst_orig;
1480 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1481
1482 if (unlikely(err)) {
1483 int i;
1484 for (i=0; i<nx; i++)
1485 xfrm_state_put(xfrm[i]);
1486 goto error;
1487 }
1488
1489 for (pi = 0; pi < npols; pi++) {
1490 read_lock_bh(&pols[pi]->lock);
1491 pol_dead |= pols[pi]->dead;
1492 read_unlock_bh(&pols[pi]->lock);
1493 }
1494
1495 write_lock_bh(&policy->lock);
1496 if (unlikely(pol_dead || stale_bundle(dst))) {
1497 /* Wow! While we worked on resolving, this
1498 * policy has gone. Retry. It is not paranoia,
1499 * we just cannot enlist new bundle to dead object.
1500 * We can't enlist stable bundles either.
1501 */
1502 write_unlock_bh(&policy->lock);
1503 if (dst)
1504 dst_free(dst);
1505
1506 err = -EHOSTUNREACH;
1507 goto error;
1508 }
1509 dst->next = policy->bundles;
1510 policy->bundles = dst;
1511 dst_hold(dst);
1512 write_unlock_bh(&policy->lock);
1513 }
1514 *dst_p = dst;
1515 dst_release(dst_orig);
1516 xfrm_pols_put(pols, npols);
1517 return 0;
1518
1519 error:
1520 dst_release(dst_orig);
1521 xfrm_pols_put(pols, npols);
1522 *dst_p = NULL;
1523 return err;
1524 }
1525 EXPORT_SYMBOL(xfrm_lookup);
1526
1527 static inline int
1528 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1529 {
1530 struct xfrm_state *x;
1531 int err;
1532
1533 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1534 return 0;
1535 x = skb->sp->xvec[idx];
1536 if (!x->type->reject)
1537 return 0;
1538 xfrm_state_hold(x);
1539 err = x->type->reject(x, skb, fl);
1540 xfrm_state_put(x);
1541 return err;
1542 }
1543
1544 /* When skb is transformed back to its "native" form, we have to
1545 * check policy restrictions. At the moment we make this in maximally
1546 * stupid way. Shame on me. :-) Of course, connected sockets must
1547 * have policy cached at them.
1548 */
1549
1550 static inline int
1551 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1552 unsigned short family)
1553 {
1554 if (xfrm_state_kern(x))
1555 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
1556 return x->id.proto == tmpl->id.proto &&
1557 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1558 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1559 x->props.mode == tmpl->mode &&
1560 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1561 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1562 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1563 xfrm_state_addr_cmp(tmpl, x, family));
1564 }
1565
1566 /*
1567 * 0 or more than 0 is returned when validation is succeeded (either bypass
1568 * because of optional transport mode, or next index of the mathced secpath
1569 * state with the template.
1570 * -1 is returned when no matching template is found.
1571 * Otherwise "-2 - errored_index" is returned.
1572 */
1573 static inline int
1574 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1575 unsigned short family)
1576 {
1577 int idx = start;
1578
1579 if (tmpl->optional) {
1580 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1581 return start;
1582 } else
1583 start = -1;
1584 for (; idx < sp->len; idx++) {
1585 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1586 return ++idx;
1587 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1588 if (start == -1)
1589 start = -2-idx;
1590 break;
1591 }
1592 }
1593 return start;
1594 }
1595
1596 int
1597 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1598 {
1599 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1600 int err;
1601
1602 if (unlikely(afinfo == NULL))
1603 return -EAFNOSUPPORT;
1604
1605 afinfo->decode_session(skb, fl);
1606 err = security_xfrm_decode_session(skb, &fl->secid);
1607 xfrm_policy_put_afinfo(afinfo);
1608 return err;
1609 }
1610 EXPORT_SYMBOL(xfrm_decode_session);
1611
1612 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1613 {
1614 for (; k < sp->len; k++) {
1615 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1616 *idxp = k;
1617 return 1;
1618 }
1619 }
1620
1621 return 0;
1622 }
1623
1624 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1625 unsigned short family)
1626 {
1627 struct xfrm_policy *pol;
1628 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1629 int npols = 0;
1630 int xfrm_nr;
1631 int pi;
1632 struct flowi fl;
1633 u8 fl_dir = policy_to_flow_dir(dir);
1634 int xerr_idx = -1;
1635
1636 if (xfrm_decode_session(skb, &fl, family) < 0)
1637 return 0;
1638 nf_nat_decode_session(skb, &fl, family);
1639
1640 /* First, check used SA against their selectors. */
1641 if (skb->sp) {
1642 int i;
1643
1644 for (i=skb->sp->len-1; i>=0; i--) {
1645 struct xfrm_state *x = skb->sp->xvec[i];
1646 if (!xfrm_selector_match(&x->sel, &fl, family))
1647 return 0;
1648 }
1649 }
1650
1651 pol = NULL;
1652 if (sk && sk->sk_policy[dir]) {
1653 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1654 if (IS_ERR(pol))
1655 return 0;
1656 }
1657
1658 if (!pol)
1659 pol = flow_cache_lookup(&fl, family, fl_dir,
1660 xfrm_policy_lookup);
1661
1662 if (IS_ERR(pol))
1663 return 0;
1664
1665 if (!pol) {
1666 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1667 xfrm_secpath_reject(xerr_idx, skb, &fl);
1668 return 0;
1669 }
1670 return 1;
1671 }
1672
1673 pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1674
1675 pols[0] = pol;
1676 npols ++;
1677 #ifdef CONFIG_XFRM_SUB_POLICY
1678 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1679 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1680 &fl, family,
1681 XFRM_POLICY_IN);
1682 if (pols[1]) {
1683 if (IS_ERR(pols[1]))
1684 return 0;
1685 pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
1686 npols ++;
1687 }
1688 }
1689 #endif
1690
1691 if (pol->action == XFRM_POLICY_ALLOW) {
1692 struct sec_path *sp;
1693 static struct sec_path dummy;
1694 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1695 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1696 struct xfrm_tmpl **tpp = tp;
1697 int ti = 0;
1698 int i, k;
1699
1700 if ((sp = skb->sp) == NULL)
1701 sp = &dummy;
1702
1703 for (pi = 0; pi < npols; pi++) {
1704 if (pols[pi] != pol &&
1705 pols[pi]->action != XFRM_POLICY_ALLOW)
1706 goto reject;
1707 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1708 goto reject_error;
1709 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1710 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1711 }
1712 xfrm_nr = ti;
1713 if (npols > 1) {
1714 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1715 tpp = stp;
1716 }
1717
1718 /* For each tunnel xfrm, find the first matching tmpl.
1719 * For each tmpl before that, find corresponding xfrm.
1720 * Order is _important_. Later we will implement
1721 * some barriers, but at the moment barriers
1722 * are implied between each two transformations.
1723 */
1724 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1725 k = xfrm_policy_ok(tpp[i], sp, k, family);
1726 if (k < 0) {
1727 if (k < -1)
1728 /* "-2 - errored_index" returned */
1729 xerr_idx = -(2+k);
1730 goto reject;
1731 }
1732 }
1733
1734 if (secpath_has_nontransport(sp, k, &xerr_idx))
1735 goto reject;
1736
1737 xfrm_pols_put(pols, npols);
1738 return 1;
1739 }
1740
1741 reject:
1742 xfrm_secpath_reject(xerr_idx, skb, &fl);
1743 reject_error:
1744 xfrm_pols_put(pols, npols);
1745 return 0;
1746 }
1747 EXPORT_SYMBOL(__xfrm_policy_check);
1748
1749 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1750 {
1751 struct flowi fl;
1752
1753 if (xfrm_decode_session(skb, &fl, family) < 0)
1754 return 0;
1755
1756 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1757 }
1758 EXPORT_SYMBOL(__xfrm_route_forward);
1759
1760 /* Optimize later using cookies and generation ids. */
1761
1762 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1763 {
1764 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1765 * to "-1" to force all XFRM destinations to get validated by
1766 * dst_ops->check on every use. We do this because when a
1767 * normal route referenced by an XFRM dst is obsoleted we do
1768 * not go looking around for all parent referencing XFRM dsts
1769 * so that we can invalidate them. It is just too much work.
1770 * Instead we make the checks here on every use. For example:
1771 *
1772 * XFRM dst A --> IPv4 dst X
1773 *
1774 * X is the "xdst->route" of A (X is also the "dst->path" of A
1775 * in this example). If X is marked obsolete, "A" will not
1776 * notice. That's what we are validating here via the
1777 * stale_bundle() check.
1778 *
1779 * When a policy's bundle is pruned, we dst_free() the XFRM
1780 * dst which causes it's ->obsolete field to be set to a
1781 * positive non-zero integer. If an XFRM dst has been pruned
1782 * like this, we want to force a new route lookup.
1783 */
1784 if (dst->obsolete < 0 && !stale_bundle(dst))
1785 return dst;
1786
1787 return NULL;
1788 }
1789
1790 static int stale_bundle(struct dst_entry *dst)
1791 {
1792 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1793 }
1794
1795 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1796 {
1797 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1798 dst->dev = &loopback_dev;
1799 dev_hold(&loopback_dev);
1800 dev_put(dev);
1801 }
1802 }
1803 EXPORT_SYMBOL(xfrm_dst_ifdown);
1804
1805 static void xfrm_link_failure(struct sk_buff *skb)
1806 {
1807 /* Impossible. Such dst must be popped before reaches point of failure. */
1808 return;
1809 }
1810
1811 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1812 {
1813 if (dst) {
1814 if (dst->obsolete) {
1815 dst_release(dst);
1816 dst = NULL;
1817 }
1818 }
1819 return dst;
1820 }
1821
1822 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1823 {
1824 struct dst_entry *dst, **dstp;
1825
1826 write_lock(&pol->lock);
1827 dstp = &pol->bundles;
1828 while ((dst=*dstp) != NULL) {
1829 if (func(dst)) {
1830 *dstp = dst->next;
1831 dst->next = *gc_list_p;
1832 *gc_list_p = dst;
1833 } else {
1834 dstp = &dst->next;
1835 }
1836 }
1837 write_unlock(&pol->lock);
1838 }
1839
1840 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1841 {
1842 struct dst_entry *gc_list = NULL;
1843 int dir;
1844
1845 read_lock_bh(&xfrm_policy_lock);
1846 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1847 struct xfrm_policy *pol;
1848 struct hlist_node *entry;
1849 struct hlist_head *table;
1850 int i;
1851
1852 hlist_for_each_entry(pol, entry,
1853 &xfrm_policy_inexact[dir], bydst)
1854 prune_one_bundle(pol, func, &gc_list);
1855
1856 table = xfrm_policy_bydst[dir].table;
1857 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1858 hlist_for_each_entry(pol, entry, table + i, bydst)
1859 prune_one_bundle(pol, func, &gc_list);
1860 }
1861 }
1862 read_unlock_bh(&xfrm_policy_lock);
1863
1864 while (gc_list) {
1865 struct dst_entry *dst = gc_list;
1866 gc_list = dst->next;
1867 dst_free(dst);
1868 }
1869 }
1870
1871 static int unused_bundle(struct dst_entry *dst)
1872 {
1873 return !atomic_read(&dst->__refcnt);
1874 }
1875
1876 static void __xfrm_garbage_collect(void)
1877 {
1878 xfrm_prune_bundles(unused_bundle);
1879 }
1880
1881 static int xfrm_flush_bundles(void)
1882 {
1883 xfrm_prune_bundles(stale_bundle);
1884 return 0;
1885 }
1886
1887 void xfrm_init_pmtu(struct dst_entry *dst)
1888 {
1889 do {
1890 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1891 u32 pmtu, route_mtu_cached;
1892
1893 pmtu = dst_mtu(dst->child);
1894 xdst->child_mtu_cached = pmtu;
1895
1896 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1897
1898 route_mtu_cached = dst_mtu(xdst->route);
1899 xdst->route_mtu_cached = route_mtu_cached;
1900
1901 if (pmtu > route_mtu_cached)
1902 pmtu = route_mtu_cached;
1903
1904 dst->metrics[RTAX_MTU-1] = pmtu;
1905 } while ((dst = dst->next));
1906 }
1907
1908 EXPORT_SYMBOL(xfrm_init_pmtu);
1909
1910 /* Check that the bundle accepts the flow and its components are
1911 * still valid.
1912 */
1913
1914 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
1915 struct flowi *fl, int family, int strict)
1916 {
1917 struct dst_entry *dst = &first->u.dst;
1918 struct xfrm_dst *last;
1919 u32 mtu;
1920
1921 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1922 (dst->dev && !netif_running(dst->dev)))
1923 return 0;
1924
1925 last = NULL;
1926
1927 do {
1928 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1929
1930 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1931 return 0;
1932 if (fl && pol &&
1933 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
1934 return 0;
1935 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1936 return 0;
1937 if (xdst->genid != dst->xfrm->genid)
1938 return 0;
1939
1940 if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
1941 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
1942 return 0;
1943
1944 mtu = dst_mtu(dst->child);
1945 if (xdst->child_mtu_cached != mtu) {
1946 last = xdst;
1947 xdst->child_mtu_cached = mtu;
1948 }
1949
1950 if (!dst_check(xdst->route, xdst->route_cookie))
1951 return 0;
1952 mtu = dst_mtu(xdst->route);
1953 if (xdst->route_mtu_cached != mtu) {
1954 last = xdst;
1955 xdst->route_mtu_cached = mtu;
1956 }
1957
1958 dst = dst->child;
1959 } while (dst->xfrm);
1960
1961 if (likely(!last))
1962 return 1;
1963
1964 mtu = last->child_mtu_cached;
1965 for (;;) {
1966 dst = &last->u.dst;
1967
1968 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1969 if (mtu > last->route_mtu_cached)
1970 mtu = last->route_mtu_cached;
1971 dst->metrics[RTAX_MTU-1] = mtu;
1972
1973 if (last == first)
1974 break;
1975
1976 last = last->u.next;
1977 last->child_mtu_cached = mtu;
1978 }
1979
1980 return 1;
1981 }
1982
1983 EXPORT_SYMBOL(xfrm_bundle_ok);
1984
1985 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1986 {
1987 int err = 0;
1988 if (unlikely(afinfo == NULL))
1989 return -EINVAL;
1990 if (unlikely(afinfo->family >= NPROTO))
1991 return -EAFNOSUPPORT;
1992 write_lock_bh(&xfrm_policy_afinfo_lock);
1993 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1994 err = -ENOBUFS;
1995 else {
1996 struct dst_ops *dst_ops = afinfo->dst_ops;
1997 if (likely(dst_ops->kmem_cachep == NULL))
1998 dst_ops->kmem_cachep = xfrm_dst_cache;
1999 if (likely(dst_ops->check == NULL))
2000 dst_ops->check = xfrm_dst_check;
2001 if (likely(dst_ops->negative_advice == NULL))
2002 dst_ops->negative_advice = xfrm_negative_advice;
2003 if (likely(dst_ops->link_failure == NULL))
2004 dst_ops->link_failure = xfrm_link_failure;
2005 if (likely(afinfo->garbage_collect == NULL))
2006 afinfo->garbage_collect = __xfrm_garbage_collect;
2007 xfrm_policy_afinfo[afinfo->family] = afinfo;
2008 }
2009 write_unlock_bh(&xfrm_policy_afinfo_lock);
2010 return err;
2011 }
2012 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2013
2014 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2015 {
2016 int err = 0;
2017 if (unlikely(afinfo == NULL))
2018 return -EINVAL;
2019 if (unlikely(afinfo->family >= NPROTO))
2020 return -EAFNOSUPPORT;
2021 write_lock_bh(&xfrm_policy_afinfo_lock);
2022 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2023 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2024 err = -EINVAL;
2025 else {
2026 struct dst_ops *dst_ops = afinfo->dst_ops;
2027 xfrm_policy_afinfo[afinfo->family] = NULL;
2028 dst_ops->kmem_cachep = NULL;
2029 dst_ops->check = NULL;
2030 dst_ops->negative_advice = NULL;
2031 dst_ops->link_failure = NULL;
2032 afinfo->garbage_collect = NULL;
2033 }
2034 }
2035 write_unlock_bh(&xfrm_policy_afinfo_lock);
2036 return err;
2037 }
2038 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2039
2040 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2041 {
2042 struct xfrm_policy_afinfo *afinfo;
2043 if (unlikely(family >= NPROTO))
2044 return NULL;
2045 read_lock(&xfrm_policy_afinfo_lock);
2046 afinfo = xfrm_policy_afinfo[family];
2047 if (unlikely(!afinfo))
2048 read_unlock(&xfrm_policy_afinfo_lock);
2049 return afinfo;
2050 }
2051
2052 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2053 {
2054 read_unlock(&xfrm_policy_afinfo_lock);
2055 }
2056
2057 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
2058 {
2059 struct xfrm_policy_afinfo *afinfo;
2060 if (unlikely(family >= NPROTO))
2061 return NULL;
2062 write_lock_bh(&xfrm_policy_afinfo_lock);
2063 afinfo = xfrm_policy_afinfo[family];
2064 if (unlikely(!afinfo))
2065 write_unlock_bh(&xfrm_policy_afinfo_lock);
2066 return afinfo;
2067 }
2068
2069 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
2070 {
2071 write_unlock_bh(&xfrm_policy_afinfo_lock);
2072 }
2073
2074 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2075 {
2076 switch (event) {
2077 case NETDEV_DOWN:
2078 xfrm_flush_bundles();
2079 }
2080 return NOTIFY_DONE;
2081 }
2082
2083 static struct notifier_block xfrm_dev_notifier = {
2084 xfrm_dev_event,
2085 NULL,
2086 0
2087 };
2088
2089 static void __init xfrm_policy_init(void)
2090 {
2091 unsigned int hmask, sz;
2092 int dir;
2093
2094 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2095 sizeof(struct xfrm_dst),
2096 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2097 NULL, NULL);
2098
2099 hmask = 8 - 1;
2100 sz = (hmask+1) * sizeof(struct hlist_head);
2101
2102 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2103 xfrm_idx_hmask = hmask;
2104 if (!xfrm_policy_byidx)
2105 panic("XFRM: failed to allocate byidx hash\n");
2106
2107 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2108 struct xfrm_policy_hash *htab;
2109
2110 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2111
2112 htab = &xfrm_policy_bydst[dir];
2113 htab->table = xfrm_hash_alloc(sz);
2114 htab->hmask = hmask;
2115 if (!htab->table)
2116 panic("XFRM: failed to allocate bydst hash\n");
2117 }
2118
2119 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2120 register_netdevice_notifier(&xfrm_dev_notifier);
2121 }
2122
2123 void __init xfrm_init(void)
2124 {
2125 xfrm_state_init();
2126 xfrm_policy_init();
2127 xfrm_input_init();
2128 }
2129
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