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[CRYPTO] api: Allow multiple frontends per backend
[pv_ops_mirror.git] / net / xfrm / xfrm_policy.c
blobb7e537fe2d7542d95335e7a2a1fde2172a5ba0b8
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 #include <linux/audit.h>
29
30 #include "xfrm_hash.h"
31
32 DEFINE_MUTEX(xfrm_cfg_mutex);
33 EXPORT_SYMBOL(xfrm_cfg_mutex);
34
35 static DEFINE_RWLOCK(xfrm_policy_lock);
36
37 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
38 EXPORT_SYMBOL(xfrm_policy_count);
39
40 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
41 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
42
43 static struct kmem_cache *xfrm_dst_cache __read_mostly;
44
45 static struct work_struct xfrm_policy_gc_work;
46 static HLIST_HEAD(xfrm_policy_gc_list);
47 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
48
49 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
50 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
51 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
52 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
53
54 static inline int
55 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
56 {
57 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
58 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
59 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
60 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
61 (fl->proto == sel->proto || !sel->proto) &&
62 (fl->oif == sel->ifindex || !sel->ifindex);
63 }
64
65 static inline int
66 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
67 {
68 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
69 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
70 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
71 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
72 (fl->proto == sel->proto || !sel->proto) &&
73 (fl->oif == sel->ifindex || !sel->ifindex);
74 }
75
76 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
77 unsigned short family)
78 {
79 switch (family) {
80 case AF_INET:
81 return __xfrm4_selector_match(sel, fl);
82 case AF_INET6:
83 return __xfrm6_selector_match(sel, fl);
84 }
85 return 0;
86 }
87
88 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
89 {
90 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
91 struct xfrm_type **typemap;
92 int err = 0;
93
94 if (unlikely(afinfo == NULL))
95 return -EAFNOSUPPORT;
96 typemap = afinfo->type_map;
97
98 if (likely(typemap[type->proto] == NULL))
99 typemap[type->proto] = type;
100 else
101 err = -EEXIST;
102 xfrm_policy_unlock_afinfo(afinfo);
103 return err;
104 }
105 EXPORT_SYMBOL(xfrm_register_type);
106
107 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
108 {
109 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
110 struct xfrm_type **typemap;
111 int err = 0;
112
113 if (unlikely(afinfo == NULL))
114 return -EAFNOSUPPORT;
115 typemap = afinfo->type_map;
116
117 if (unlikely(typemap[type->proto] != type))
118 err = -ENOENT;
119 else
120 typemap[type->proto] = NULL;
121 xfrm_policy_unlock_afinfo(afinfo);
122 return err;
123 }
124 EXPORT_SYMBOL(xfrm_unregister_type);
125
126 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
127 {
128 struct xfrm_policy_afinfo *afinfo;
129 struct xfrm_type **typemap;
130 struct xfrm_type *type;
131 int modload_attempted = 0;
132
133 retry:
134 afinfo = xfrm_policy_get_afinfo(family);
135 if (unlikely(afinfo == NULL))
136 return NULL;
137 typemap = afinfo->type_map;
138
139 type = typemap[proto];
140 if (unlikely(type && !try_module_get(type->owner)))
141 type = NULL;
142 if (!type && !modload_attempted) {
143 xfrm_policy_put_afinfo(afinfo);
144 request_module("xfrm-type-%d-%d",
145 (int) family, (int) proto);
146 modload_attempted = 1;
147 goto retry;
148 }
149
150 xfrm_policy_put_afinfo(afinfo);
151 return type;
152 }
153
154 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
155 unsigned short family)
156 {
157 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
158 int err = 0;
159
160 if (unlikely(afinfo == NULL))
161 return -EAFNOSUPPORT;
162
163 if (likely(afinfo->dst_lookup != NULL))
164 err = afinfo->dst_lookup(dst, fl);
165 else
166 err = -EINVAL;
167 xfrm_policy_put_afinfo(afinfo);
168 return err;
169 }
170 EXPORT_SYMBOL(xfrm_dst_lookup);
171
172 void xfrm_put_type(struct xfrm_type *type)
173 {
174 module_put(type->owner);
175 }
176
177 int xfrm_register_mode(struct xfrm_mode *mode, int family)
178 {
179 struct xfrm_policy_afinfo *afinfo;
180 struct xfrm_mode **modemap;
181 int err;
182
183 if (unlikely(mode->encap >= XFRM_MODE_MAX))
184 return -EINVAL;
185
186 afinfo = xfrm_policy_lock_afinfo(family);
187 if (unlikely(afinfo == NULL))
188 return -EAFNOSUPPORT;
189
190 err = -EEXIST;
191 modemap = afinfo->mode_map;
192 if (likely(modemap[mode->encap] == NULL)) {
193 modemap[mode->encap] = mode;
194 err = 0;
195 }
196
197 xfrm_policy_unlock_afinfo(afinfo);
198 return err;
199 }
200 EXPORT_SYMBOL(xfrm_register_mode);
201
202 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
203 {
204 struct xfrm_policy_afinfo *afinfo;
205 struct xfrm_mode **modemap;
206 int err;
207
208 if (unlikely(mode->encap >= XFRM_MODE_MAX))
209 return -EINVAL;
210
211 afinfo = xfrm_policy_lock_afinfo(family);
212 if (unlikely(afinfo == NULL))
213 return -EAFNOSUPPORT;
214
215 err = -ENOENT;
216 modemap = afinfo->mode_map;
217 if (likely(modemap[mode->encap] == mode)) {
218 modemap[mode->encap] = NULL;
219 err = 0;
220 }
221
222 xfrm_policy_unlock_afinfo(afinfo);
223 return err;
224 }
225 EXPORT_SYMBOL(xfrm_unregister_mode);
226
227 struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
228 {
229 struct xfrm_policy_afinfo *afinfo;
230 struct xfrm_mode *mode;
231 int modload_attempted = 0;
232
233 if (unlikely(encap >= XFRM_MODE_MAX))
234 return NULL;
235
236 retry:
237 afinfo = xfrm_policy_get_afinfo(family);
238 if (unlikely(afinfo == NULL))
239 return NULL;
240
241 mode = afinfo->mode_map[encap];
242 if (unlikely(mode && !try_module_get(mode->owner)))
243 mode = NULL;
244 if (!mode && !modload_attempted) {
245 xfrm_policy_put_afinfo(afinfo);
246 request_module("xfrm-mode-%d-%d", family, encap);
247 modload_attempted = 1;
248 goto retry;
249 }
250
251 xfrm_policy_put_afinfo(afinfo);
252 return mode;
253 }
254
255 void xfrm_put_mode(struct xfrm_mode *mode)
256 {
257 module_put(mode->owner);
258 }
259
260 static inline unsigned long make_jiffies(long secs)
261 {
262 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
263 return MAX_SCHEDULE_TIMEOUT-1;
264 else
265 return secs*HZ;
266 }
267
268 static void xfrm_policy_timer(unsigned long data)
269 {
270 struct xfrm_policy *xp = (struct xfrm_policy*)data;
271 unsigned long now = (unsigned long)xtime.tv_sec;
272 long next = LONG_MAX;
273 int warn = 0;
274 int dir;
275
276 read_lock(&xp->lock);
277
278 if (xp->dead)
279 goto out;
280
281 dir = xfrm_policy_id2dir(xp->index);
282
283 if (xp->lft.hard_add_expires_seconds) {
284 long tmo = xp->lft.hard_add_expires_seconds +
285 xp->curlft.add_time - now;
286 if (tmo <= 0)
287 goto expired;
288 if (tmo < next)
289 next = tmo;
290 }
291 if (xp->lft.hard_use_expires_seconds) {
292 long tmo = xp->lft.hard_use_expires_seconds +
293 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
294 if (tmo <= 0)
295 goto expired;
296 if (tmo < next)
297 next = tmo;
298 }
299 if (xp->lft.soft_add_expires_seconds) {
300 long tmo = xp->lft.soft_add_expires_seconds +
301 xp->curlft.add_time - now;
302 if (tmo <= 0) {
303 warn = 1;
304 tmo = XFRM_KM_TIMEOUT;
305 }
306 if (tmo < next)
307 next = tmo;
308 }
309 if (xp->lft.soft_use_expires_seconds) {
310 long tmo = xp->lft.soft_use_expires_seconds +
311 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
312 if (tmo <= 0) {
313 warn = 1;
314 tmo = XFRM_KM_TIMEOUT;
315 }
316 if (tmo < next)
317 next = tmo;
318 }
319
320 if (warn)
321 km_policy_expired(xp, dir, 0, 0);
322 if (next != LONG_MAX &&
323 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
324 xfrm_pol_hold(xp);
325
326 out:
327 read_unlock(&xp->lock);
328 xfrm_pol_put(xp);
329 return;
330
331 expired:
332 read_unlock(&xp->lock);
333 if (!xfrm_policy_delete(xp, dir))
334 km_policy_expired(xp, dir, 1, 0);
335 xfrm_pol_put(xp);
336 }
337
338
339 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
340 * SPD calls.
341 */
342
343 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
344 {
345 struct xfrm_policy *policy;
346
347 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
348
349 if (policy) {
350 INIT_HLIST_NODE(&policy->bydst);
351 INIT_HLIST_NODE(&policy->byidx);
352 rwlock_init(&policy->lock);
353 atomic_set(&policy->refcnt, 1);
354 init_timer(&policy->timer);
355 policy->timer.data = (unsigned long)policy;
356 policy->timer.function = xfrm_policy_timer;
357 }
358 return policy;
359 }
360 EXPORT_SYMBOL(xfrm_policy_alloc);
361
362 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
363
364 void __xfrm_policy_destroy(struct xfrm_policy *policy)
365 {
366 BUG_ON(!policy->dead);
367
368 BUG_ON(policy->bundles);
369
370 if (del_timer(&policy->timer))
371 BUG();
372
373 security_xfrm_policy_free(policy);
374 kfree(policy);
375 }
376 EXPORT_SYMBOL(__xfrm_policy_destroy);
377
378 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
379 {
380 struct dst_entry *dst;
381
382 while ((dst = policy->bundles) != NULL) {
383 policy->bundles = dst->next;
384 dst_free(dst);
385 }
386
387 if (del_timer(&policy->timer))
388 atomic_dec(&policy->refcnt);
389
390 if (atomic_read(&policy->refcnt) > 1)
391 flow_cache_flush();
392
393 xfrm_pol_put(policy);
394 }
395
396 static void xfrm_policy_gc_task(struct work_struct *work)
397 {
398 struct xfrm_policy *policy;
399 struct hlist_node *entry, *tmp;
400 struct hlist_head gc_list;
401
402 spin_lock_bh(&xfrm_policy_gc_lock);
403 gc_list.first = xfrm_policy_gc_list.first;
404 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
405 spin_unlock_bh(&xfrm_policy_gc_lock);
406
407 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
408 xfrm_policy_gc_kill(policy);
409 }
410
411 /* Rule must be locked. Release descentant resources, announce
412 * entry dead. The rule must be unlinked from lists to the moment.
413 */
414
415 static void xfrm_policy_kill(struct xfrm_policy *policy)
416 {
417 int dead;
418
419 write_lock_bh(&policy->lock);
420 dead = policy->dead;
421 policy->dead = 1;
422 write_unlock_bh(&policy->lock);
423
424 if (unlikely(dead)) {
425 WARN_ON(1);
426 return;
427 }
428
429 spin_lock(&xfrm_policy_gc_lock);
430 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
431 spin_unlock(&xfrm_policy_gc_lock);
432
433 schedule_work(&xfrm_policy_gc_work);
434 }
435
436 struct xfrm_policy_hash {
437 struct hlist_head *table;
438 unsigned int hmask;
439 };
440
441 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
442 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
443 static struct hlist_head *xfrm_policy_byidx __read_mostly;
444 static unsigned int xfrm_idx_hmask __read_mostly;
445 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
446
447 static inline unsigned int idx_hash(u32 index)
448 {
449 return __idx_hash(index, xfrm_idx_hmask);
450 }
451
452 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
453 {
454 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
455 unsigned int hash = __sel_hash(sel, family, hmask);
456
457 return (hash == hmask + 1 ?
458 &xfrm_policy_inexact[dir] :
459 xfrm_policy_bydst[dir].table + hash);
460 }
461
462 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
463 {
464 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
465 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
466
467 return xfrm_policy_bydst[dir].table + hash;
468 }
469
470 static void xfrm_dst_hash_transfer(struct hlist_head *list,
471 struct hlist_head *ndsttable,
472 unsigned int nhashmask)
473 {
474 struct hlist_node *entry, *tmp;
475 struct xfrm_policy *pol;
476
477 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
478 unsigned int h;
479
480 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
481 pol->family, nhashmask);
482 hlist_add_head(&pol->bydst, ndsttable+h);
483 }
484 }
485
486 static void xfrm_idx_hash_transfer(struct hlist_head *list,
487 struct hlist_head *nidxtable,
488 unsigned int nhashmask)
489 {
490 struct hlist_node *entry, *tmp;
491 struct xfrm_policy *pol;
492
493 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
494 unsigned int h;
495
496 h = __idx_hash(pol->index, nhashmask);
497 hlist_add_head(&pol->byidx, nidxtable+h);
498 }
499 }
500
501 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
502 {
503 return ((old_hmask + 1) << 1) - 1;
504 }
505
506 static void xfrm_bydst_resize(int dir)
507 {
508 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
509 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
510 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
511 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
512 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
513 int i;
514
515 if (!ndst)
516 return;
517
518 write_lock_bh(&xfrm_policy_lock);
519
520 for (i = hmask; i >= 0; i--)
521 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
522
523 xfrm_policy_bydst[dir].table = ndst;
524 xfrm_policy_bydst[dir].hmask = nhashmask;
525
526 write_unlock_bh(&xfrm_policy_lock);
527
528 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
529 }
530
531 static void xfrm_byidx_resize(int total)
532 {
533 unsigned int hmask = xfrm_idx_hmask;
534 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
535 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
536 struct hlist_head *oidx = xfrm_policy_byidx;
537 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
538 int i;
539
540 if (!nidx)
541 return;
542
543 write_lock_bh(&xfrm_policy_lock);
544
545 for (i = hmask; i >= 0; i--)
546 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
547
548 xfrm_policy_byidx = nidx;
549 xfrm_idx_hmask = nhashmask;
550
551 write_unlock_bh(&xfrm_policy_lock);
552
553 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
554 }
555
556 static inline int xfrm_bydst_should_resize(int dir, int *total)
557 {
558 unsigned int cnt = xfrm_policy_count[dir];
559 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
560
561 if (total)
562 *total += cnt;
563
564 if ((hmask + 1) < xfrm_policy_hashmax &&
565 cnt > hmask)
566 return 1;
567
568 return 0;
569 }
570
571 static inline int xfrm_byidx_should_resize(int total)
572 {
573 unsigned int hmask = xfrm_idx_hmask;
574
575 if ((hmask + 1) < xfrm_policy_hashmax &&
576 total > hmask)
577 return 1;
578
579 return 0;
580 }
581
582 static DEFINE_MUTEX(hash_resize_mutex);
583
584 static void xfrm_hash_resize(struct work_struct *__unused)
585 {
586 int dir, total;
587
588 mutex_lock(&hash_resize_mutex);
589
590 total = 0;
591 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
592 if (xfrm_bydst_should_resize(dir, &total))
593 xfrm_bydst_resize(dir);
594 }
595 if (xfrm_byidx_should_resize(total))
596 xfrm_byidx_resize(total);
597
598 mutex_unlock(&hash_resize_mutex);
599 }
600
601 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
602
603 /* Generate new index... KAME seems to generate them ordered by cost
604 * of an absolute inpredictability of ordering of rules. This will not pass. */
605 static u32 xfrm_gen_index(u8 type, int dir)
606 {
607 static u32 idx_generator;
608
609 for (;;) {
610 struct hlist_node *entry;
611 struct hlist_head *list;
612 struct xfrm_policy *p;
613 u32 idx;
614 int found;
615
616 idx = (idx_generator | dir);
617 idx_generator += 8;
618 if (idx == 0)
619 idx = 8;
620 list = xfrm_policy_byidx + idx_hash(idx);
621 found = 0;
622 hlist_for_each_entry(p, entry, list, byidx) {
623 if (p->index == idx) {
624 found = 1;
625 break;
626 }
627 }
628 if (!found)
629 return idx;
630 }
631 }
632
633 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
634 {
635 u32 *p1 = (u32 *) s1;
636 u32 *p2 = (u32 *) s2;
637 int len = sizeof(struct xfrm_selector) / sizeof(u32);
638 int i;
639
640 for (i = 0; i < len; i++) {
641 if (p1[i] != p2[i])
642 return 1;
643 }
644
645 return 0;
646 }
647
648 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
649 {
650 struct xfrm_policy *pol;
651 struct xfrm_policy *delpol;
652 struct hlist_head *chain;
653 struct hlist_node *entry, *newpos;
654 struct dst_entry *gc_list;
655
656 write_lock_bh(&xfrm_policy_lock);
657 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
658 delpol = NULL;
659 newpos = NULL;
660 hlist_for_each_entry(pol, entry, chain, bydst) {
661 if (pol->type == policy->type &&
662 !selector_cmp(&pol->selector, &policy->selector) &&
663 xfrm_sec_ctx_match(pol->security, policy->security) &&
664 !WARN_ON(delpol)) {
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 newpos = &pol->bydst;
674 continue;
675 }
676 if (delpol)
677 break;
678 }
679 if (newpos)
680 hlist_add_after(newpos, &policy->bydst);
681 else
682 hlist_add_head(&policy->bydst, chain);
683 xfrm_pol_hold(policy);
684 xfrm_policy_count[dir]++;
685 atomic_inc(&flow_cache_genid);
686 if (delpol) {
687 hlist_del(&delpol->bydst);
688 hlist_del(&delpol->byidx);
689 xfrm_policy_count[dir]--;
690 }
691 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
692 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
693 policy->curlft.add_time = (unsigned long)xtime.tv_sec;
694 policy->curlft.use_time = 0;
695 if (!mod_timer(&policy->timer, jiffies + HZ))
696 xfrm_pol_hold(policy);
697 write_unlock_bh(&xfrm_policy_lock);
698
699 if (delpol)
700 xfrm_policy_kill(delpol);
701 else if (xfrm_bydst_should_resize(dir, NULL))
702 schedule_work(&xfrm_hash_work);
703
704 read_lock_bh(&xfrm_policy_lock);
705 gc_list = NULL;
706 entry = &policy->bydst;
707 hlist_for_each_entry_continue(policy, entry, bydst) {
708 struct dst_entry *dst;
709
710 write_lock(&policy->lock);
711 dst = policy->bundles;
712 if (dst) {
713 struct dst_entry *tail = dst;
714 while (tail->next)
715 tail = tail->next;
716 tail->next = gc_list;
717 gc_list = dst;
718
719 policy->bundles = NULL;
720 }
721 write_unlock(&policy->lock);
722 }
723 read_unlock_bh(&xfrm_policy_lock);
724
725 while (gc_list) {
726 struct dst_entry *dst = gc_list;
727
728 gc_list = dst->next;
729 dst_free(dst);
730 }
731
732 return 0;
733 }
734 EXPORT_SYMBOL(xfrm_policy_insert);
735
736 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
737 struct xfrm_selector *sel,
738 struct xfrm_sec_ctx *ctx, int delete)
739 {
740 struct xfrm_policy *pol, *ret;
741 struct hlist_head *chain;
742 struct hlist_node *entry;
743
744 write_lock_bh(&xfrm_policy_lock);
745 chain = policy_hash_bysel(sel, sel->family, dir);
746 ret = NULL;
747 hlist_for_each_entry(pol, entry, chain, bydst) {
748 if (pol->type == type &&
749 !selector_cmp(sel, &pol->selector) &&
750 xfrm_sec_ctx_match(ctx, pol->security)) {
751 xfrm_pol_hold(pol);
752 if (delete) {
753 hlist_del(&pol->bydst);
754 hlist_del(&pol->byidx);
755 xfrm_policy_count[dir]--;
756 }
757 ret = pol;
758 break;
759 }
760 }
761 write_unlock_bh(&xfrm_policy_lock);
762
763 if (ret && delete) {
764 atomic_inc(&flow_cache_genid);
765 xfrm_policy_kill(ret);
766 }
767 return ret;
768 }
769 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
770
771 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete)
772 {
773 struct xfrm_policy *pol, *ret;
774 struct hlist_head *chain;
775 struct hlist_node *entry;
776
777 write_lock_bh(&xfrm_policy_lock);
778 chain = xfrm_policy_byidx + idx_hash(id);
779 ret = NULL;
780 hlist_for_each_entry(pol, entry, chain, byidx) {
781 if (pol->type == type && pol->index == id) {
782 xfrm_pol_hold(pol);
783 if (delete) {
784 hlist_del(&pol->bydst);
785 hlist_del(&pol->byidx);
786 xfrm_policy_count[dir]--;
787 }
788 ret = pol;
789 break;
790 }
791 }
792 write_unlock_bh(&xfrm_policy_lock);
793
794 if (ret && delete) {
795 atomic_inc(&flow_cache_genid);
796 xfrm_policy_kill(ret);
797 }
798 return ret;
799 }
800 EXPORT_SYMBOL(xfrm_policy_byid);
801
802 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
803 {
804 int dir;
805
806 write_lock_bh(&xfrm_policy_lock);
807 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
808 struct xfrm_policy *pol;
809 struct hlist_node *entry;
810 int i, killed;
811
812 killed = 0;
813 again1:
814 hlist_for_each_entry(pol, entry,
815 &xfrm_policy_inexact[dir], bydst) {
816 if (pol->type != type)
817 continue;
818 hlist_del(&pol->bydst);
819 hlist_del(&pol->byidx);
820 write_unlock_bh(&xfrm_policy_lock);
821
822 xfrm_audit_log(audit_info->loginuid, audit_info->secid,
823 AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL);
824
825 xfrm_policy_kill(pol);
826 killed++;
827
828 write_lock_bh(&xfrm_policy_lock);
829 goto again1;
830 }
831
832 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
833 again2:
834 hlist_for_each_entry(pol, entry,
835 xfrm_policy_bydst[dir].table + i,
836 bydst) {
837 if (pol->type != type)
838 continue;
839 hlist_del(&pol->bydst);
840 hlist_del(&pol->byidx);
841 write_unlock_bh(&xfrm_policy_lock);
842
843 xfrm_audit_log(audit_info->loginuid,
844 audit_info->secid,
845 AUDIT_MAC_IPSEC_DELSPD, 1,
846 pol, NULL);
847
848 xfrm_policy_kill(pol);
849 killed++;
850
851 write_lock_bh(&xfrm_policy_lock);
852 goto again2;
853 }
854 }
855
856 xfrm_policy_count[dir] -= killed;
857 }
858 atomic_inc(&flow_cache_genid);
859 write_unlock_bh(&xfrm_policy_lock);
860 }
861 EXPORT_SYMBOL(xfrm_policy_flush);
862
863 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
864 void *data)
865 {
866 struct xfrm_policy *pol, *last = NULL;
867 struct hlist_node *entry;
868 int dir, last_dir = 0, count, error;
869
870 read_lock_bh(&xfrm_policy_lock);
871 count = 0;
872
873 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
874 struct hlist_head *table = xfrm_policy_bydst[dir].table;
875 int i;
876
877 hlist_for_each_entry(pol, entry,
878 &xfrm_policy_inexact[dir], bydst) {
879 if (pol->type != type)
880 continue;
881 if (last) {
882 error = func(last, last_dir % XFRM_POLICY_MAX,
883 count, data);
884 if (error)
885 goto out;
886 }
887 last = pol;
888 last_dir = dir;
889 count++;
890 }
891 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
892 hlist_for_each_entry(pol, entry, table + i, bydst) {
893 if (pol->type != type)
894 continue;
895 if (last) {
896 error = func(last, last_dir % XFRM_POLICY_MAX,
897 count, data);
898 if (error)
899 goto out;
900 }
901 last = pol;
902 last_dir = dir;
903 count++;
904 }
905 }
906 }
907 if (count == 0) {
908 error = -ENOENT;
909 goto out;
910 }
911 error = func(last, last_dir % XFRM_POLICY_MAX, 0, data);
912 out:
913 read_unlock_bh(&xfrm_policy_lock);
914 return error;
915 }
916 EXPORT_SYMBOL(xfrm_policy_walk);
917
918 /*
919 * Find policy to apply to this flow.
920 *
921 * Returns 0 if policy found, else an -errno.
922 */
923 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
924 u8 type, u16 family, int dir)
925 {
926 struct xfrm_selector *sel = &pol->selector;
927 int match, ret = -ESRCH;
928
929 if (pol->family != family ||
930 pol->type != type)
931 return ret;
932
933 match = xfrm_selector_match(sel, fl, family);
934 if (match)
935 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
936
937 return ret;
938 }
939
940 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
941 u16 family, u8 dir)
942 {
943 int err;
944 struct xfrm_policy *pol, *ret;
945 xfrm_address_t *daddr, *saddr;
946 struct hlist_node *entry;
947 struct hlist_head *chain;
948 u32 priority = ~0U;
949
950 daddr = xfrm_flowi_daddr(fl, family);
951 saddr = xfrm_flowi_saddr(fl, family);
952 if (unlikely(!daddr || !saddr))
953 return NULL;
954
955 read_lock_bh(&xfrm_policy_lock);
956 chain = policy_hash_direct(daddr, saddr, family, dir);
957 ret = NULL;
958 hlist_for_each_entry(pol, entry, chain, bydst) {
959 err = xfrm_policy_match(pol, fl, type, family, dir);
960 if (err) {
961 if (err == -ESRCH)
962 continue;
963 else {
964 ret = ERR_PTR(err);
965 goto fail;
966 }
967 } else {
968 ret = pol;
969 priority = ret->priority;
970 break;
971 }
972 }
973 chain = &xfrm_policy_inexact[dir];
974 hlist_for_each_entry(pol, entry, chain, bydst) {
975 err = xfrm_policy_match(pol, fl, type, family, dir);
976 if (err) {
977 if (err == -ESRCH)
978 continue;
979 else {
980 ret = ERR_PTR(err);
981 goto fail;
982 }
983 } else if (pol->priority < priority) {
984 ret = pol;
985 break;
986 }
987 }
988 if (ret)
989 xfrm_pol_hold(ret);
990 fail:
991 read_unlock_bh(&xfrm_policy_lock);
992
993 return ret;
994 }
995
996 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
997 void **objp, atomic_t **obj_refp)
998 {
999 struct xfrm_policy *pol;
1000 int err = 0;
1001
1002 #ifdef CONFIG_XFRM_SUB_POLICY
1003 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
1004 if (IS_ERR(pol)) {
1005 err = PTR_ERR(pol);
1006 pol = NULL;
1007 }
1008 if (pol || err)
1009 goto end;
1010 #endif
1011 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1012 if (IS_ERR(pol)) {
1013 err = PTR_ERR(pol);
1014 pol = NULL;
1015 }
1016 #ifdef CONFIG_XFRM_SUB_POLICY
1017 end:
1018 #endif
1019 if ((*objp = (void *) pol) != NULL)
1020 *obj_refp = &pol->refcnt;
1021 return err;
1022 }
1023
1024 static inline int policy_to_flow_dir(int dir)
1025 {
1026 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1027 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1028 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1029 return dir;
1030 switch (dir) {
1031 default:
1032 case XFRM_POLICY_IN:
1033 return FLOW_DIR_IN;
1034 case XFRM_POLICY_OUT:
1035 return FLOW_DIR_OUT;
1036 case XFRM_POLICY_FWD:
1037 return FLOW_DIR_FWD;
1038 };
1039 }
1040
1041 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1042 {
1043 struct xfrm_policy *pol;
1044
1045 read_lock_bh(&xfrm_policy_lock);
1046 if ((pol = sk->sk_policy[dir]) != NULL) {
1047 int match = xfrm_selector_match(&pol->selector, fl,
1048 sk->sk_family);
1049 int err = 0;
1050
1051 if (match) {
1052 err = security_xfrm_policy_lookup(pol, fl->secid,
1053 policy_to_flow_dir(dir));
1054 if (!err)
1055 xfrm_pol_hold(pol);
1056 else if (err == -ESRCH)
1057 pol = NULL;
1058 else
1059 pol = ERR_PTR(err);
1060 } else
1061 pol = NULL;
1062 }
1063 read_unlock_bh(&xfrm_policy_lock);
1064 return pol;
1065 }
1066
1067 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1068 {
1069 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1070 pol->family, dir);
1071
1072 hlist_add_head(&pol->bydst, chain);
1073 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1074 xfrm_policy_count[dir]++;
1075 xfrm_pol_hold(pol);
1076
1077 if (xfrm_bydst_should_resize(dir, NULL))
1078 schedule_work(&xfrm_hash_work);
1079 }
1080
1081 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1082 int dir)
1083 {
1084 if (hlist_unhashed(&pol->bydst))
1085 return NULL;
1086
1087 hlist_del(&pol->bydst);
1088 hlist_del(&pol->byidx);
1089 xfrm_policy_count[dir]--;
1090
1091 return pol;
1092 }
1093
1094 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1095 {
1096 write_lock_bh(&xfrm_policy_lock);
1097 pol = __xfrm_policy_unlink(pol, dir);
1098 write_unlock_bh(&xfrm_policy_lock);
1099 if (pol) {
1100 if (dir < XFRM_POLICY_MAX)
1101 atomic_inc(&flow_cache_genid);
1102 xfrm_policy_kill(pol);
1103 return 0;
1104 }
1105 return -ENOENT;
1106 }
1107 EXPORT_SYMBOL(xfrm_policy_delete);
1108
1109 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1110 {
1111 struct xfrm_policy *old_pol;
1112
1113 #ifdef CONFIG_XFRM_SUB_POLICY
1114 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1115 return -EINVAL;
1116 #endif
1117
1118 write_lock_bh(&xfrm_policy_lock);
1119 old_pol = sk->sk_policy[dir];
1120 sk->sk_policy[dir] = pol;
1121 if (pol) {
1122 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
1123 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1124 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1125 }
1126 if (old_pol)
1127 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1128 write_unlock_bh(&xfrm_policy_lock);
1129
1130 if (old_pol) {
1131 xfrm_policy_kill(old_pol);
1132 }
1133 return 0;
1134 }
1135
1136 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1137 {
1138 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1139
1140 if (newp) {
1141 newp->selector = old->selector;
1142 if (security_xfrm_policy_clone(old, newp)) {
1143 kfree(newp);
1144 return NULL; /* ENOMEM */
1145 }
1146 newp->lft = old->lft;
1147 newp->curlft = old->curlft;
1148 newp->action = old->action;
1149 newp->flags = old->flags;
1150 newp->xfrm_nr = old->xfrm_nr;
1151 newp->index = old->index;
1152 newp->type = old->type;
1153 memcpy(newp->xfrm_vec, old->xfrm_vec,
1154 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1155 write_lock_bh(&xfrm_policy_lock);
1156 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1157 write_unlock_bh(&xfrm_policy_lock);
1158 xfrm_pol_put(newp);
1159 }
1160 return newp;
1161 }
1162
1163 int __xfrm_sk_clone_policy(struct sock *sk)
1164 {
1165 struct xfrm_policy *p0 = sk->sk_policy[0],
1166 *p1 = sk->sk_policy[1];
1167
1168 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1169 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1170 return -ENOMEM;
1171 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1172 return -ENOMEM;
1173 return 0;
1174 }
1175
1176 static int
1177 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1178 unsigned short family)
1179 {
1180 int err;
1181 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1182
1183 if (unlikely(afinfo == NULL))
1184 return -EINVAL;
1185 err = afinfo->get_saddr(local, remote);
1186 xfrm_policy_put_afinfo(afinfo);
1187 return err;
1188 }
1189
1190 /* Resolve list of templates for the flow, given policy. */
1191
1192 static int
1193 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1194 struct xfrm_state **xfrm,
1195 unsigned short family)
1196 {
1197 int nx;
1198 int i, error;
1199 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1200 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1201 xfrm_address_t tmp;
1202
1203 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1204 struct xfrm_state *x;
1205 xfrm_address_t *remote = daddr;
1206 xfrm_address_t *local = saddr;
1207 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1208
1209 if (tmpl->mode == XFRM_MODE_TUNNEL) {
1210 remote = &tmpl->id.daddr;
1211 local = &tmpl->saddr;
1212 family = tmpl->encap_family;
1213 if (xfrm_addr_any(local, family)) {
1214 error = xfrm_get_saddr(&tmp, remote, family);
1215 if (error)
1216 goto fail;
1217 local = &tmp;
1218 }
1219 }
1220
1221 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1222
1223 if (x && x->km.state == XFRM_STATE_VALID) {
1224 xfrm[nx++] = x;
1225 daddr = remote;
1226 saddr = local;
1227 continue;
1228 }
1229 if (x) {
1230 error = (x->km.state == XFRM_STATE_ERROR ?
1231 -EINVAL : -EAGAIN);
1232 xfrm_state_put(x);
1233 }
1234
1235 if (!tmpl->optional)
1236 goto fail;
1237 }
1238 return nx;
1239
1240 fail:
1241 for (nx--; nx>=0; nx--)
1242 xfrm_state_put(xfrm[nx]);
1243 return error;
1244 }
1245
1246 static int
1247 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1248 struct xfrm_state **xfrm,
1249 unsigned short family)
1250 {
1251 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1252 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1253 int cnx = 0;
1254 int error;
1255 int ret;
1256 int i;
1257
1258 for (i = 0; i < npols; i++) {
1259 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1260 error = -ENOBUFS;
1261 goto fail;
1262 }
1263
1264 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1265 if (ret < 0) {
1266 error = ret;
1267 goto fail;
1268 } else
1269 cnx += ret;
1270 }
1271
1272 /* found states are sorted for outbound processing */
1273 if (npols > 1)
1274 xfrm_state_sort(xfrm, tpp, cnx, family);
1275
1276 return cnx;
1277
1278 fail:
1279 for (cnx--; cnx>=0; cnx--)
1280 xfrm_state_put(tpp[cnx]);
1281 return error;
1282
1283 }
1284
1285 /* Check that the bundle accepts the flow and its components are
1286 * still valid.
1287 */
1288
1289 static struct dst_entry *
1290 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1291 {
1292 struct dst_entry *x;
1293 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1294 if (unlikely(afinfo == NULL))
1295 return ERR_PTR(-EINVAL);
1296 x = afinfo->find_bundle(fl, policy);
1297 xfrm_policy_put_afinfo(afinfo);
1298 return x;
1299 }
1300
1301 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1302 * all the metrics... Shortly, bundle a bundle.
1303 */
1304
1305 static int
1306 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1307 struct flowi *fl, struct dst_entry **dst_p,
1308 unsigned short family)
1309 {
1310 int err;
1311 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1312 if (unlikely(afinfo == NULL))
1313 return -EINVAL;
1314 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1315 xfrm_policy_put_afinfo(afinfo);
1316 return err;
1317 }
1318
1319
1320 static int stale_bundle(struct dst_entry *dst);
1321
1322 /* Main function: finds/creates a bundle for given flow.
1323 *
1324 * At the moment we eat a raw IP route. Mostly to speed up lookups
1325 * on interfaces with disabled IPsec.
1326 */
1327 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1328 struct sock *sk, int flags)
1329 {
1330 struct xfrm_policy *policy;
1331 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1332 int npols;
1333 int pol_dead;
1334 int xfrm_nr;
1335 int pi;
1336 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1337 struct dst_entry *dst, *dst_orig = *dst_p;
1338 int nx = 0;
1339 int err;
1340 u32 genid;
1341 u16 family;
1342 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1343
1344 restart:
1345 genid = atomic_read(&flow_cache_genid);
1346 policy = NULL;
1347 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1348 pols[pi] = NULL;
1349 npols = 0;
1350 pol_dead = 0;
1351 xfrm_nr = 0;
1352
1353 if (sk && sk->sk_policy[1]) {
1354 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1355 if (IS_ERR(policy))
1356 return PTR_ERR(policy);
1357 }
1358
1359 if (!policy) {
1360 /* To accelerate a bit... */
1361 if ((dst_orig->flags & DST_NOXFRM) ||
1362 !xfrm_policy_count[XFRM_POLICY_OUT])
1363 return 0;
1364
1365 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1366 dir, xfrm_policy_lookup);
1367 if (IS_ERR(policy))
1368 return PTR_ERR(policy);
1369 }
1370
1371 if (!policy)
1372 return 0;
1373
1374 family = dst_orig->ops->family;
1375 policy->curlft.use_time = (unsigned long)xtime.tv_sec;
1376 pols[0] = policy;
1377 npols ++;
1378 xfrm_nr += pols[0]->xfrm_nr;
1379
1380 switch (policy->action) {
1381 case XFRM_POLICY_BLOCK:
1382 /* Prohibit the flow */
1383 err = -EPERM;
1384 goto error;
1385
1386 case XFRM_POLICY_ALLOW:
1387 #ifndef CONFIG_XFRM_SUB_POLICY
1388 if (policy->xfrm_nr == 0) {
1389 /* Flow passes not transformed. */
1390 xfrm_pol_put(policy);
1391 return 0;
1392 }
1393 #endif
1394
1395 /* Try to find matching bundle.
1396 *
1397 * LATER: help from flow cache. It is optional, this
1398 * is required only for output policy.
1399 */
1400 dst = xfrm_find_bundle(fl, policy, family);
1401 if (IS_ERR(dst)) {
1402 err = PTR_ERR(dst);
1403 goto error;
1404 }
1405
1406 if (dst)
1407 break;
1408
1409 #ifdef CONFIG_XFRM_SUB_POLICY
1410 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1411 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1412 fl, family,
1413 XFRM_POLICY_OUT);
1414 if (pols[1]) {
1415 if (IS_ERR(pols[1])) {
1416 err = PTR_ERR(pols[1]);
1417 goto error;
1418 }
1419 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1420 err = -EPERM;
1421 goto error;
1422 }
1423 npols ++;
1424 xfrm_nr += pols[1]->xfrm_nr;
1425 }
1426 }
1427
1428 /*
1429 * Because neither flowi nor bundle information knows about
1430 * transformation template size. On more than one policy usage
1431 * we can realize whether all of them is bypass or not after
1432 * they are searched. See above not-transformed bypass
1433 * is surrounded by non-sub policy configuration, too.
1434 */
1435 if (xfrm_nr == 0) {
1436 /* Flow passes not transformed. */
1437 xfrm_pols_put(pols, npols);
1438 return 0;
1439 }
1440
1441 #endif
1442 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1443
1444 if (unlikely(nx<0)) {
1445 err = nx;
1446 if (err == -EAGAIN && flags) {
1447 DECLARE_WAITQUEUE(wait, current);
1448
1449 add_wait_queue(&km_waitq, &wait);
1450 set_current_state(TASK_INTERRUPTIBLE);
1451 schedule();
1452 set_current_state(TASK_RUNNING);
1453 remove_wait_queue(&km_waitq, &wait);
1454
1455 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1456
1457 if (nx == -EAGAIN && signal_pending(current)) {
1458 err = -ERESTART;
1459 goto error;
1460 }
1461 if (nx == -EAGAIN ||
1462 genid != atomic_read(&flow_cache_genid)) {
1463 xfrm_pols_put(pols, npols);
1464 goto restart;
1465 }
1466 err = nx;
1467 }
1468 if (err < 0)
1469 goto error;
1470 }
1471 if (nx == 0) {
1472 /* Flow passes not transformed. */
1473 xfrm_pols_put(pols, npols);
1474 return 0;
1475 }
1476
1477 dst = dst_orig;
1478 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1479
1480 if (unlikely(err)) {
1481 int i;
1482 for (i=0; i<nx; i++)
1483 xfrm_state_put(xfrm[i]);
1484 goto error;
1485 }
1486
1487 for (pi = 0; pi < npols; pi++) {
1488 read_lock_bh(&pols[pi]->lock);
1489 pol_dead |= pols[pi]->dead;
1490 read_unlock_bh(&pols[pi]->lock);
1491 }
1492
1493 write_lock_bh(&policy->lock);
1494 if (unlikely(pol_dead || stale_bundle(dst))) {
1495 /* Wow! While we worked on resolving, this
1496 * policy has gone. Retry. It is not paranoia,
1497 * we just cannot enlist new bundle to dead object.
1498 * We can't enlist stable bundles either.
1499 */
1500 write_unlock_bh(&policy->lock);
1501 if (dst)
1502 dst_free(dst);
1503
1504 err = -EHOSTUNREACH;
1505 goto error;
1506 }
1507 dst->next = policy->bundles;
1508 policy->bundles = dst;
1509 dst_hold(dst);
1510 write_unlock_bh(&policy->lock);
1511 }
1512 *dst_p = dst;
1513 dst_release(dst_orig);
1514 xfrm_pols_put(pols, npols);
1515 return 0;
1516
1517 error:
1518 dst_release(dst_orig);
1519 xfrm_pols_put(pols, npols);
1520 *dst_p = NULL;
1521 return err;
1522 }
1523 EXPORT_SYMBOL(xfrm_lookup);
1524
1525 static inline int
1526 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1527 {
1528 struct xfrm_state *x;
1529 int err;
1530
1531 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1532 return 0;
1533 x = skb->sp->xvec[idx];
1534 if (!x->type->reject)
1535 return 0;
1536 xfrm_state_hold(x);
1537 err = x->type->reject(x, skb, fl);
1538 xfrm_state_put(x);
1539 return err;
1540 }
1541
1542 /* When skb is transformed back to its "native" form, we have to
1543 * check policy restrictions. At the moment we make this in maximally
1544 * stupid way. Shame on me. :-) Of course, connected sockets must
1545 * have policy cached at them.
1546 */
1547
1548 static inline int
1549 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1550 unsigned short family)
1551 {
1552 if (xfrm_state_kern(x))
1553 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
1554 return x->id.proto == tmpl->id.proto &&
1555 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1556 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1557 x->props.mode == tmpl->mode &&
1558 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1559 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1560 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1561 xfrm_state_addr_cmp(tmpl, x, family));
1562 }
1563
1564 /*
1565 * 0 or more than 0 is returned when validation is succeeded (either bypass
1566 * because of optional transport mode, or next index of the mathced secpath
1567 * state with the template.
1568 * -1 is returned when no matching template is found.
1569 * Otherwise "-2 - errored_index" is returned.
1570 */
1571 static inline int
1572 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1573 unsigned short family)
1574 {
1575 int idx = start;
1576
1577 if (tmpl->optional) {
1578 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1579 return start;
1580 } else
1581 start = -1;
1582 for (; idx < sp->len; idx++) {
1583 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1584 return ++idx;
1585 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1586 if (start == -1)
1587 start = -2-idx;
1588 break;
1589 }
1590 }
1591 return start;
1592 }
1593
1594 int
1595 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1596 {
1597 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1598 int err;
1599
1600 if (unlikely(afinfo == NULL))
1601 return -EAFNOSUPPORT;
1602
1603 afinfo->decode_session(skb, fl);
1604 err = security_xfrm_decode_session(skb, &fl->secid);
1605 xfrm_policy_put_afinfo(afinfo);
1606 return err;
1607 }
1608 EXPORT_SYMBOL(xfrm_decode_session);
1609
1610 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1611 {
1612 for (; k < sp->len; k++) {
1613 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1614 *idxp = k;
1615 return 1;
1616 }
1617 }
1618
1619 return 0;
1620 }
1621
1622 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1623 unsigned short family)
1624 {
1625 struct xfrm_policy *pol;
1626 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1627 int npols = 0;
1628 int xfrm_nr;
1629 int pi;
1630 struct flowi fl;
1631 u8 fl_dir = policy_to_flow_dir(dir);
1632 int xerr_idx = -1;
1633
1634 if (xfrm_decode_session(skb, &fl, family) < 0)
1635 return 0;
1636 nf_nat_decode_session(skb, &fl, family);
1637
1638 /* First, check used SA against their selectors. */
1639 if (skb->sp) {
1640 int i;
1641
1642 for (i=skb->sp->len-1; i>=0; i--) {
1643 struct xfrm_state *x = skb->sp->xvec[i];
1644 if (!xfrm_selector_match(&x->sel, &fl, family))
1645 return 0;
1646 }
1647 }
1648
1649 pol = NULL;
1650 if (sk && sk->sk_policy[dir]) {
1651 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1652 if (IS_ERR(pol))
1653 return 0;
1654 }
1655
1656 if (!pol)
1657 pol = flow_cache_lookup(&fl, family, fl_dir,
1658 xfrm_policy_lookup);
1659
1660 if (IS_ERR(pol))
1661 return 0;
1662
1663 if (!pol) {
1664 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1665 xfrm_secpath_reject(xerr_idx, skb, &fl);
1666 return 0;
1667 }
1668 return 1;
1669 }
1670
1671 pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1672
1673 pols[0] = pol;
1674 npols ++;
1675 #ifdef CONFIG_XFRM_SUB_POLICY
1676 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1677 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1678 &fl, family,
1679 XFRM_POLICY_IN);
1680 if (pols[1]) {
1681 if (IS_ERR(pols[1]))
1682 return 0;
1683 pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
1684 npols ++;
1685 }
1686 }
1687 #endif
1688
1689 if (pol->action == XFRM_POLICY_ALLOW) {
1690 struct sec_path *sp;
1691 static struct sec_path dummy;
1692 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1693 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1694 struct xfrm_tmpl **tpp = tp;
1695 int ti = 0;
1696 int i, k;
1697
1698 if ((sp = skb->sp) == NULL)
1699 sp = &dummy;
1700
1701 for (pi = 0; pi < npols; pi++) {
1702 if (pols[pi] != pol &&
1703 pols[pi]->action != XFRM_POLICY_ALLOW)
1704 goto reject;
1705 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1706 goto reject_error;
1707 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1708 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1709 }
1710 xfrm_nr = ti;
1711 if (npols > 1) {
1712 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1713 tpp = stp;
1714 }
1715
1716 /* For each tunnel xfrm, find the first matching tmpl.
1717 * For each tmpl before that, find corresponding xfrm.
1718 * Order is _important_. Later we will implement
1719 * some barriers, but at the moment barriers
1720 * are implied between each two transformations.
1721 */
1722 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1723 k = xfrm_policy_ok(tpp[i], sp, k, family);
1724 if (k < 0) {
1725 if (k < -1)
1726 /* "-2 - errored_index" returned */
1727 xerr_idx = -(2+k);
1728 goto reject;
1729 }
1730 }
1731
1732 if (secpath_has_nontransport(sp, k, &xerr_idx))
1733 goto reject;
1734
1735 xfrm_pols_put(pols, npols);
1736 return 1;
1737 }
1738
1739 reject:
1740 xfrm_secpath_reject(xerr_idx, skb, &fl);
1741 reject_error:
1742 xfrm_pols_put(pols, npols);
1743 return 0;
1744 }
1745 EXPORT_SYMBOL(__xfrm_policy_check);
1746
1747 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1748 {
1749 struct flowi fl;
1750
1751 if (xfrm_decode_session(skb, &fl, family) < 0)
1752 return 0;
1753
1754 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1755 }
1756 EXPORT_SYMBOL(__xfrm_route_forward);
1757
1758 /* Optimize later using cookies and generation ids. */
1759
1760 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1761 {
1762 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1763 * to "-1" to force all XFRM destinations to get validated by
1764 * dst_ops->check on every use. We do this because when a
1765 * normal route referenced by an XFRM dst is obsoleted we do
1766 * not go looking around for all parent referencing XFRM dsts
1767 * so that we can invalidate them. It is just too much work.
1768 * Instead we make the checks here on every use. For example:
1769 *
1770 * XFRM dst A --> IPv4 dst X
1771 *
1772 * X is the "xdst->route" of A (X is also the "dst->path" of A
1773 * in this example). If X is marked obsolete, "A" will not
1774 * notice. That's what we are validating here via the
1775 * stale_bundle() check.
1776 *
1777 * When a policy's bundle is pruned, we dst_free() the XFRM
1778 * dst which causes it's ->obsolete field to be set to a
1779 * positive non-zero integer. If an XFRM dst has been pruned
1780 * like this, we want to force a new route lookup.
1781 */
1782 if (dst->obsolete < 0 && !stale_bundle(dst))
1783 return dst;
1784
1785 return NULL;
1786 }
1787
1788 static int stale_bundle(struct dst_entry *dst)
1789 {
1790 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1791 }
1792
1793 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1794 {
1795 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1796 dst->dev = &loopback_dev;
1797 dev_hold(&loopback_dev);
1798 dev_put(dev);
1799 }
1800 }
1801 EXPORT_SYMBOL(xfrm_dst_ifdown);
1802
1803 static void xfrm_link_failure(struct sk_buff *skb)
1804 {
1805 /* Impossible. Such dst must be popped before reaches point of failure. */
1806 return;
1807 }
1808
1809 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1810 {
1811 if (dst) {
1812 if (dst->obsolete) {
1813 dst_release(dst);
1814 dst = NULL;
1815 }
1816 }
1817 return dst;
1818 }
1819
1820 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1821 {
1822 struct dst_entry *dst, **dstp;
1823
1824 write_lock(&pol->lock);
1825 dstp = &pol->bundles;
1826 while ((dst=*dstp) != NULL) {
1827 if (func(dst)) {
1828 *dstp = dst->next;
1829 dst->next = *gc_list_p;
1830 *gc_list_p = dst;
1831 } else {
1832 dstp = &dst->next;
1833 }
1834 }
1835 write_unlock(&pol->lock);
1836 }
1837
1838 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1839 {
1840 struct dst_entry *gc_list = NULL;
1841 int dir;
1842
1843 read_lock_bh(&xfrm_policy_lock);
1844 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1845 struct xfrm_policy *pol;
1846 struct hlist_node *entry;
1847 struct hlist_head *table;
1848 int i;
1849
1850 hlist_for_each_entry(pol, entry,
1851 &xfrm_policy_inexact[dir], bydst)
1852 prune_one_bundle(pol, func, &gc_list);
1853
1854 table = xfrm_policy_bydst[dir].table;
1855 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1856 hlist_for_each_entry(pol, entry, table + i, bydst)
1857 prune_one_bundle(pol, func, &gc_list);
1858 }
1859 }
1860 read_unlock_bh(&xfrm_policy_lock);
1861
1862 while (gc_list) {
1863 struct dst_entry *dst = gc_list;
1864 gc_list = dst->next;
1865 dst_free(dst);
1866 }
1867 }
1868
1869 static int unused_bundle(struct dst_entry *dst)
1870 {
1871 return !atomic_read(&dst->__refcnt);
1872 }
1873
1874 static void __xfrm_garbage_collect(void)
1875 {
1876 xfrm_prune_bundles(unused_bundle);
1877 }
1878
1879 static int xfrm_flush_bundles(void)
1880 {
1881 xfrm_prune_bundles(stale_bundle);
1882 return 0;
1883 }
1884
1885 void xfrm_init_pmtu(struct dst_entry *dst)
1886 {
1887 do {
1888 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1889 u32 pmtu, route_mtu_cached;
1890
1891 pmtu = dst_mtu(dst->child);
1892 xdst->child_mtu_cached = pmtu;
1893
1894 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1895
1896 route_mtu_cached = dst_mtu(xdst->route);
1897 xdst->route_mtu_cached = route_mtu_cached;
1898
1899 if (pmtu > route_mtu_cached)
1900 pmtu = route_mtu_cached;
1901
1902 dst->metrics[RTAX_MTU-1] = pmtu;
1903 } while ((dst = dst->next));
1904 }
1905
1906 EXPORT_SYMBOL(xfrm_init_pmtu);
1907
1908 /* Check that the bundle accepts the flow and its components are
1909 * still valid.
1910 */
1911
1912 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
1913 struct flowi *fl, int family, int strict)
1914 {
1915 struct dst_entry *dst = &first->u.dst;
1916 struct xfrm_dst *last;
1917 u32 mtu;
1918
1919 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1920 (dst->dev && !netif_running(dst->dev)))
1921 return 0;
1922
1923 last = NULL;
1924
1925 do {
1926 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1927
1928 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1929 return 0;
1930 if (fl && pol &&
1931 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
1932 return 0;
1933 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1934 return 0;
1935 if (xdst->genid != dst->xfrm->genid)
1936 return 0;
1937
1938 if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
1939 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
1940 return 0;
1941
1942 mtu = dst_mtu(dst->child);
1943 if (xdst->child_mtu_cached != mtu) {
1944 last = xdst;
1945 xdst->child_mtu_cached = mtu;
1946 }
1947
1948 if (!dst_check(xdst->route, xdst->route_cookie))
1949 return 0;
1950 mtu = dst_mtu(xdst->route);
1951 if (xdst->route_mtu_cached != mtu) {
1952 last = xdst;
1953 xdst->route_mtu_cached = mtu;
1954 }
1955
1956 dst = dst->child;
1957 } while (dst->xfrm);
1958
1959 if (likely(!last))
1960 return 1;
1961
1962 mtu = last->child_mtu_cached;
1963 for (;;) {
1964 dst = &last->u.dst;
1965
1966 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1967 if (mtu > last->route_mtu_cached)
1968 mtu = last->route_mtu_cached;
1969 dst->metrics[RTAX_MTU-1] = mtu;
1970
1971 if (last == first)
1972 break;
1973
1974 last = last->u.next;
1975 last->child_mtu_cached = mtu;
1976 }
1977
1978 return 1;
1979 }
1980
1981 EXPORT_SYMBOL(xfrm_bundle_ok);
1982
1983 #ifdef CONFIG_AUDITSYSCALL
1984 /* Audit addition and deletion of SAs and ipsec policy */
1985
1986 void xfrm_audit_log(uid_t auid, u32 sid, int type, int result,
1987 struct xfrm_policy *xp, struct xfrm_state *x)
1988 {
1989
1990 char *secctx;
1991 u32 secctx_len;
1992 struct xfrm_sec_ctx *sctx = NULL;
1993 struct audit_buffer *audit_buf;
1994 int family;
1995 extern int audit_enabled;
1996
1997 if (audit_enabled == 0)
1998 return;
1999
2000 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
2001 if (audit_buf == NULL)
2002 return;
2003
2004 switch(type) {
2005 case AUDIT_MAC_IPSEC_ADDSA:
2006 audit_log_format(audit_buf, "SAD add: auid=%u", auid);
2007 break;
2008 case AUDIT_MAC_IPSEC_DELSA:
2009 audit_log_format(audit_buf, "SAD delete: auid=%u", auid);
2010 break;
2011 case AUDIT_MAC_IPSEC_ADDSPD:
2012 audit_log_format(audit_buf, "SPD add: auid=%u", auid);
2013 break;
2014 case AUDIT_MAC_IPSEC_DELSPD:
2015 audit_log_format(audit_buf, "SPD delete: auid=%u", auid);
2016 break;
2017 default:
2018 return;
2019 }
2020
2021 if (sid != 0 &&
2022 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0)
2023 audit_log_format(audit_buf, " subj=%s", secctx);
2024 else
2025 audit_log_task_context(audit_buf);
2026
2027 if (xp) {
2028 family = xp->selector.family;
2029 if (xp->security)
2030 sctx = xp->security;
2031 } else {
2032 family = x->props.family;
2033 if (x->security)
2034 sctx = x->security;
2035 }
2036
2037 if (sctx)
2038 audit_log_format(audit_buf,
2039 " sec_alg=%u sec_doi=%u sec_obj=%s",
2040 sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str);
2041
2042 switch(family) {
2043 case AF_INET:
2044 {
2045 struct in_addr saddr, daddr;
2046 if (xp) {
2047 saddr.s_addr = xp->selector.saddr.a4;
2048 daddr.s_addr = xp->selector.daddr.a4;
2049 } else {
2050 saddr.s_addr = x->props.saddr.a4;
2051 daddr.s_addr = x->id.daddr.a4;
2052 }
2053 audit_log_format(audit_buf,
2054 " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
2055 NIPQUAD(saddr), NIPQUAD(daddr));
2056 }
2057 break;
2058 case AF_INET6:
2059 {
2060 struct in6_addr saddr6, daddr6;
2061 if (xp) {
2062 memcpy(&saddr6, xp->selector.saddr.a6,
2063 sizeof(struct in6_addr));
2064 memcpy(&daddr6, xp->selector.daddr.a6,
2065 sizeof(struct in6_addr));
2066 } else {
2067 memcpy(&saddr6, x->props.saddr.a6,
2068 sizeof(struct in6_addr));
2069 memcpy(&daddr6, x->id.daddr.a6,
2070 sizeof(struct in6_addr));
2071 }
2072 audit_log_format(audit_buf,
2073 " src=" NIP6_FMT "dst=" NIP6_FMT,
2074 NIP6(saddr6), NIP6(daddr6));
2075 }
2076 break;
2077 }
2078
2079 if (x)
2080 audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s",
2081 (unsigned long)ntohl(x->id.spi),
2082 (unsigned long)ntohl(x->id.spi),
2083 x->id.proto == IPPROTO_AH ? "AH" :
2084 (x->id.proto == IPPROTO_ESP ?
2085 "ESP" : "IPCOMP"));
2086
2087 audit_log_format(audit_buf, " res=%u", result);
2088 audit_log_end(audit_buf);
2089 }
2090
2091 EXPORT_SYMBOL(xfrm_audit_log);
2092 #endif /* CONFIG_AUDITSYSCALL */
2093
2094 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2095 {
2096 int err = 0;
2097 if (unlikely(afinfo == NULL))
2098 return -EINVAL;
2099 if (unlikely(afinfo->family >= NPROTO))
2100 return -EAFNOSUPPORT;
2101 write_lock_bh(&xfrm_policy_afinfo_lock);
2102 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2103 err = -ENOBUFS;
2104 else {
2105 struct dst_ops *dst_ops = afinfo->dst_ops;
2106 if (likely(dst_ops->kmem_cachep == NULL))
2107 dst_ops->kmem_cachep = xfrm_dst_cache;
2108 if (likely(dst_ops->check == NULL))
2109 dst_ops->check = xfrm_dst_check;
2110 if (likely(dst_ops->negative_advice == NULL))
2111 dst_ops->negative_advice = xfrm_negative_advice;
2112 if (likely(dst_ops->link_failure == NULL))
2113 dst_ops->link_failure = xfrm_link_failure;
2114 if (likely(afinfo->garbage_collect == NULL))
2115 afinfo->garbage_collect = __xfrm_garbage_collect;
2116 xfrm_policy_afinfo[afinfo->family] = afinfo;
2117 }
2118 write_unlock_bh(&xfrm_policy_afinfo_lock);
2119 return err;
2120 }
2121 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2122
2123 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2124 {
2125 int err = 0;
2126 if (unlikely(afinfo == NULL))
2127 return -EINVAL;
2128 if (unlikely(afinfo->family >= NPROTO))
2129 return -EAFNOSUPPORT;
2130 write_lock_bh(&xfrm_policy_afinfo_lock);
2131 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2132 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2133 err = -EINVAL;
2134 else {
2135 struct dst_ops *dst_ops = afinfo->dst_ops;
2136 xfrm_policy_afinfo[afinfo->family] = NULL;
2137 dst_ops->kmem_cachep = NULL;
2138 dst_ops->check = NULL;
2139 dst_ops->negative_advice = NULL;
2140 dst_ops->link_failure = NULL;
2141 afinfo->garbage_collect = NULL;
2142 }
2143 }
2144 write_unlock_bh(&xfrm_policy_afinfo_lock);
2145 return err;
2146 }
2147 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2148
2149 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2150 {
2151 struct xfrm_policy_afinfo *afinfo;
2152 if (unlikely(family >= NPROTO))
2153 return NULL;
2154 read_lock(&xfrm_policy_afinfo_lock);
2155 afinfo = xfrm_policy_afinfo[family];
2156 if (unlikely(!afinfo))
2157 read_unlock(&xfrm_policy_afinfo_lock);
2158 return afinfo;
2159 }
2160
2161 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2162 {
2163 read_unlock(&xfrm_policy_afinfo_lock);
2164 }
2165
2166 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
2167 {
2168 struct xfrm_policy_afinfo *afinfo;
2169 if (unlikely(family >= NPROTO))
2170 return NULL;
2171 write_lock_bh(&xfrm_policy_afinfo_lock);
2172 afinfo = xfrm_policy_afinfo[family];
2173 if (unlikely(!afinfo))
2174 write_unlock_bh(&xfrm_policy_afinfo_lock);
2175 return afinfo;
2176 }
2177
2178 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
2179 {
2180 write_unlock_bh(&xfrm_policy_afinfo_lock);
2181 }
2182
2183 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2184 {
2185 switch (event) {
2186 case NETDEV_DOWN:
2187 xfrm_flush_bundles();
2188 }
2189 return NOTIFY_DONE;
2190 }
2191
2192 static struct notifier_block xfrm_dev_notifier = {
2193 xfrm_dev_event,
2194 NULL,
2195 0
2196 };
2197
2198 static void __init xfrm_policy_init(void)
2199 {
2200 unsigned int hmask, sz;
2201 int dir;
2202
2203 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2204 sizeof(struct xfrm_dst),
2205 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2206 NULL, NULL);
2207
2208 hmask = 8 - 1;
2209 sz = (hmask+1) * sizeof(struct hlist_head);
2210
2211 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2212 xfrm_idx_hmask = hmask;
2213 if (!xfrm_policy_byidx)
2214 panic("XFRM: failed to allocate byidx hash\n");
2215
2216 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2217 struct xfrm_policy_hash *htab;
2218
2219 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2220
2221 htab = &xfrm_policy_bydst[dir];
2222 htab->table = xfrm_hash_alloc(sz);
2223 htab->hmask = hmask;
2224 if (!htab->table)
2225 panic("XFRM: failed to allocate bydst hash\n");
2226 }
2227
2228 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2229 register_netdevice_notifier(&xfrm_dev_notifier);
2230 }
2231
2232 void __init xfrm_init(void)
2233 {
2234 xfrm_state_init();
2235 xfrm_policy_init();
2236 xfrm_input_init();
2237 }
2238
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