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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / net / xfrm / xfrm_policy.c
blobcae9fd81554350eb1893aa1da37ada7f646b5a08
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/err.h>
17 #include <linux/slab.h>
18 #include <linux/kmod.h>
19 #include <linux/list.h>
20 #include <linux/spinlock.h>
21 #include <linux/workqueue.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/cache.h>
27 #include <linux/audit.h>
28 #include <net/dst.h>
29 #include <net/xfrm.h>
30 #include <net/ip.h>
31 #ifdef CONFIG_XFRM_STATISTICS
32 #include <net/snmp.h>
33 #endif
34
35 #include "xfrm_hash.h"
36
37 int sysctl_xfrm_larval_drop __read_mostly;
38
39 #ifdef CONFIG_XFRM_STATISTICS
40 DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly;
41 EXPORT_SYMBOL(xfrm_statistics);
42 #endif
43
44 DEFINE_MUTEX(xfrm_cfg_mutex);
45 EXPORT_SYMBOL(xfrm_cfg_mutex);
46
47 static DEFINE_RWLOCK(xfrm_policy_lock);
48
49 static struct list_head xfrm_policy_bytype[XFRM_POLICY_TYPE_MAX];
50 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
51 EXPORT_SYMBOL(xfrm_policy_count);
52
53 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
54 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
55
56 static struct kmem_cache *xfrm_dst_cache __read_mostly;
57
58 static struct work_struct xfrm_policy_gc_work;
59 static HLIST_HEAD(xfrm_policy_gc_list);
60 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
61
62 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
63 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
64 static void xfrm_init_pmtu(struct dst_entry *dst);
65
66 static inline int
67 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
68 {
69 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
70 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
71 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
72 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
73 (fl->proto == sel->proto || !sel->proto) &&
74 (fl->oif == sel->ifindex || !sel->ifindex);
75 }
76
77 static inline int
78 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
79 {
80 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
81 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
82 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
83 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
84 (fl->proto == sel->proto || !sel->proto) &&
85 (fl->oif == sel->ifindex || !sel->ifindex);
86 }
87
88 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
89 unsigned short family)
90 {
91 switch (family) {
92 case AF_INET:
93 return __xfrm4_selector_match(sel, fl);
94 case AF_INET6:
95 return __xfrm6_selector_match(sel, fl);
96 }
97 return 0;
98 }
99
100 static inline struct dst_entry *__xfrm_dst_lookup(int tos,
101 xfrm_address_t *saddr,
102 xfrm_address_t *daddr,
103 int family)
104 {
105 struct xfrm_policy_afinfo *afinfo;
106 struct dst_entry *dst;
107
108 afinfo = xfrm_policy_get_afinfo(family);
109 if (unlikely(afinfo == NULL))
110 return ERR_PTR(-EAFNOSUPPORT);
111
112 dst = afinfo->dst_lookup(tos, saddr, daddr);
113
114 xfrm_policy_put_afinfo(afinfo);
115
116 return dst;
117 }
118
119 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
120 xfrm_address_t *prev_saddr,
121 xfrm_address_t *prev_daddr,
122 int family)
123 {
124 xfrm_address_t *saddr = &x->props.saddr;
125 xfrm_address_t *daddr = &x->id.daddr;
126 struct dst_entry *dst;
127
128 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
129 saddr = x->coaddr;
130 daddr = prev_daddr;
131 }
132 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
133 saddr = prev_saddr;
134 daddr = x->coaddr;
135 }
136
137 dst = __xfrm_dst_lookup(tos, saddr, daddr, family);
138
139 if (!IS_ERR(dst)) {
140 if (prev_saddr != saddr)
141 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
142 if (prev_daddr != daddr)
143 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
144 }
145
146 return dst;
147 }
148
149 static inline unsigned long make_jiffies(long secs)
150 {
151 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
152 return MAX_SCHEDULE_TIMEOUT-1;
153 else
154 return secs*HZ;
155 }
156
157 static void xfrm_policy_timer(unsigned long data)
158 {
159 struct xfrm_policy *xp = (struct xfrm_policy*)data;
160 unsigned long now = get_seconds();
161 long next = LONG_MAX;
162 int warn = 0;
163 int dir;
164
165 read_lock(&xp->lock);
166
167 if (xp->dead)
168 goto out;
169
170 dir = xfrm_policy_id2dir(xp->index);
171
172 if (xp->lft.hard_add_expires_seconds) {
173 long tmo = xp->lft.hard_add_expires_seconds +
174 xp->curlft.add_time - now;
175 if (tmo <= 0)
176 goto expired;
177 if (tmo < next)
178 next = tmo;
179 }
180 if (xp->lft.hard_use_expires_seconds) {
181 long tmo = xp->lft.hard_use_expires_seconds +
182 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
183 if (tmo <= 0)
184 goto expired;
185 if (tmo < next)
186 next = tmo;
187 }
188 if (xp->lft.soft_add_expires_seconds) {
189 long tmo = xp->lft.soft_add_expires_seconds +
190 xp->curlft.add_time - now;
191 if (tmo <= 0) {
192 warn = 1;
193 tmo = XFRM_KM_TIMEOUT;
194 }
195 if (tmo < next)
196 next = tmo;
197 }
198 if (xp->lft.soft_use_expires_seconds) {
199 long tmo = xp->lft.soft_use_expires_seconds +
200 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
201 if (tmo <= 0) {
202 warn = 1;
203 tmo = XFRM_KM_TIMEOUT;
204 }
205 if (tmo < next)
206 next = tmo;
207 }
208
209 if (warn)
210 km_policy_expired(xp, dir, 0, 0);
211 if (next != LONG_MAX &&
212 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
213 xfrm_pol_hold(xp);
214
215 out:
216 read_unlock(&xp->lock);
217 xfrm_pol_put(xp);
218 return;
219
220 expired:
221 read_unlock(&xp->lock);
222 if (!xfrm_policy_delete(xp, dir))
223 km_policy_expired(xp, dir, 1, 0);
224 xfrm_pol_put(xp);
225 }
226
227
228 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
229 * SPD calls.
230 */
231
232 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
233 {
234 struct xfrm_policy *policy;
235
236 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
237
238 if (policy) {
239 INIT_LIST_HEAD(&policy->bytype);
240 INIT_HLIST_NODE(&policy->bydst);
241 INIT_HLIST_NODE(&policy->byidx);
242 rwlock_init(&policy->lock);
243 atomic_set(&policy->refcnt, 1);
244 setup_timer(&policy->timer, xfrm_policy_timer,
245 (unsigned long)policy);
246 }
247 return policy;
248 }
249 EXPORT_SYMBOL(xfrm_policy_alloc);
250
251 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
252
253 void xfrm_policy_destroy(struct xfrm_policy *policy)
254 {
255 BUG_ON(!policy->dead);
256
257 BUG_ON(policy->bundles);
258
259 if (del_timer(&policy->timer))
260 BUG();
261
262 write_lock_bh(&xfrm_policy_lock);
263 list_del(&policy->bytype);
264 write_unlock_bh(&xfrm_policy_lock);
265
266 security_xfrm_policy_free(policy->security);
267 kfree(policy);
268 }
269 EXPORT_SYMBOL(xfrm_policy_destroy);
270
271 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
272 {
273 struct dst_entry *dst;
274
275 while ((dst = policy->bundles) != NULL) {
276 policy->bundles = dst->next;
277 dst_free(dst);
278 }
279
280 if (del_timer(&policy->timer))
281 atomic_dec(&policy->refcnt);
282
283 if (atomic_read(&policy->refcnt) > 1)
284 flow_cache_flush();
285
286 xfrm_pol_put(policy);
287 }
288
289 static void xfrm_policy_gc_task(struct work_struct *work)
290 {
291 struct xfrm_policy *policy;
292 struct hlist_node *entry, *tmp;
293 struct hlist_head gc_list;
294
295 spin_lock_bh(&xfrm_policy_gc_lock);
296 gc_list.first = xfrm_policy_gc_list.first;
297 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
298 spin_unlock_bh(&xfrm_policy_gc_lock);
299
300 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
301 xfrm_policy_gc_kill(policy);
302 }
303
304 /* Rule must be locked. Release descentant resources, announce
305 * entry dead. The rule must be unlinked from lists to the moment.
306 */
307
308 static void xfrm_policy_kill(struct xfrm_policy *policy)
309 {
310 int dead;
311
312 write_lock_bh(&policy->lock);
313 dead = policy->dead;
314 policy->dead = 1;
315 write_unlock_bh(&policy->lock);
316
317 if (unlikely(dead)) {
318 WARN_ON(1);
319 return;
320 }
321
322 spin_lock(&xfrm_policy_gc_lock);
323 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
324 spin_unlock(&xfrm_policy_gc_lock);
325
326 schedule_work(&xfrm_policy_gc_work);
327 }
328
329 struct xfrm_policy_hash {
330 struct hlist_head *table;
331 unsigned int hmask;
332 };
333
334 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
335 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
336 static struct hlist_head *xfrm_policy_byidx __read_mostly;
337 static unsigned int xfrm_idx_hmask __read_mostly;
338 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
339
340 static inline unsigned int idx_hash(u32 index)
341 {
342 return __idx_hash(index, xfrm_idx_hmask);
343 }
344
345 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
346 {
347 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
348 unsigned int hash = __sel_hash(sel, family, hmask);
349
350 return (hash == hmask + 1 ?
351 &xfrm_policy_inexact[dir] :
352 xfrm_policy_bydst[dir].table + hash);
353 }
354
355 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
356 {
357 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
358 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
359
360 return xfrm_policy_bydst[dir].table + hash;
361 }
362
363 static void xfrm_dst_hash_transfer(struct hlist_head *list,
364 struct hlist_head *ndsttable,
365 unsigned int nhashmask)
366 {
367 struct hlist_node *entry, *tmp, *entry0 = NULL;
368 struct xfrm_policy *pol;
369 unsigned int h0 = 0;
370
371 redo:
372 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
373 unsigned int h;
374
375 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
376 pol->family, nhashmask);
377 if (!entry0) {
378 hlist_del(entry);
379 hlist_add_head(&pol->bydst, ndsttable+h);
380 h0 = h;
381 } else {
382 if (h != h0)
383 continue;
384 hlist_del(entry);
385 hlist_add_after(entry0, &pol->bydst);
386 }
387 entry0 = entry;
388 }
389 if (!hlist_empty(list)) {
390 entry0 = NULL;
391 goto redo;
392 }
393 }
394
395 static void xfrm_idx_hash_transfer(struct hlist_head *list,
396 struct hlist_head *nidxtable,
397 unsigned int nhashmask)
398 {
399 struct hlist_node *entry, *tmp;
400 struct xfrm_policy *pol;
401
402 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
403 unsigned int h;
404
405 h = __idx_hash(pol->index, nhashmask);
406 hlist_add_head(&pol->byidx, nidxtable+h);
407 }
408 }
409
410 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
411 {
412 return ((old_hmask + 1) << 1) - 1;
413 }
414
415 static void xfrm_bydst_resize(int dir)
416 {
417 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
418 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
419 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
420 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
421 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
422 int i;
423
424 if (!ndst)
425 return;
426
427 write_lock_bh(&xfrm_policy_lock);
428
429 for (i = hmask; i >= 0; i--)
430 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
431
432 xfrm_policy_bydst[dir].table = ndst;
433 xfrm_policy_bydst[dir].hmask = nhashmask;
434
435 write_unlock_bh(&xfrm_policy_lock);
436
437 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
438 }
439
440 static void xfrm_byidx_resize(int total)
441 {
442 unsigned int hmask = xfrm_idx_hmask;
443 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
444 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
445 struct hlist_head *oidx = xfrm_policy_byidx;
446 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
447 int i;
448
449 if (!nidx)
450 return;
451
452 write_lock_bh(&xfrm_policy_lock);
453
454 for (i = hmask; i >= 0; i--)
455 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
456
457 xfrm_policy_byidx = nidx;
458 xfrm_idx_hmask = nhashmask;
459
460 write_unlock_bh(&xfrm_policy_lock);
461
462 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
463 }
464
465 static inline int xfrm_bydst_should_resize(int dir, int *total)
466 {
467 unsigned int cnt = xfrm_policy_count[dir];
468 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
469
470 if (total)
471 *total += cnt;
472
473 if ((hmask + 1) < xfrm_policy_hashmax &&
474 cnt > hmask)
475 return 1;
476
477 return 0;
478 }
479
480 static inline int xfrm_byidx_should_resize(int total)
481 {
482 unsigned int hmask = xfrm_idx_hmask;
483
484 if ((hmask + 1) < xfrm_policy_hashmax &&
485 total > hmask)
486 return 1;
487
488 return 0;
489 }
490
491 void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
492 {
493 read_lock_bh(&xfrm_policy_lock);
494 si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
495 si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
496 si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
497 si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
498 si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
499 si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
500 si->spdhcnt = xfrm_idx_hmask;
501 si->spdhmcnt = xfrm_policy_hashmax;
502 read_unlock_bh(&xfrm_policy_lock);
503 }
504 EXPORT_SYMBOL(xfrm_spd_getinfo);
505
506 static DEFINE_MUTEX(hash_resize_mutex);
507 static void xfrm_hash_resize(struct work_struct *__unused)
508 {
509 int dir, total;
510
511 mutex_lock(&hash_resize_mutex);
512
513 total = 0;
514 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
515 if (xfrm_bydst_should_resize(dir, &total))
516 xfrm_bydst_resize(dir);
517 }
518 if (xfrm_byidx_should_resize(total))
519 xfrm_byidx_resize(total);
520
521 mutex_unlock(&hash_resize_mutex);
522 }
523
524 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
525
526 /* Generate new index... KAME seems to generate them ordered by cost
527 * of an absolute inpredictability of ordering of rules. This will not pass. */
528 static u32 xfrm_gen_index(u8 type, int dir)
529 {
530 static u32 idx_generator;
531
532 for (;;) {
533 struct hlist_node *entry;
534 struct hlist_head *list;
535 struct xfrm_policy *p;
536 u32 idx;
537 int found;
538
539 idx = (idx_generator | dir);
540 idx_generator += 8;
541 if (idx == 0)
542 idx = 8;
543 list = xfrm_policy_byidx + idx_hash(idx);
544 found = 0;
545 hlist_for_each_entry(p, entry, list, byidx) {
546 if (p->index == idx) {
547 found = 1;
548 break;
549 }
550 }
551 if (!found)
552 return idx;
553 }
554 }
555
556 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
557 {
558 u32 *p1 = (u32 *) s1;
559 u32 *p2 = (u32 *) s2;
560 int len = sizeof(struct xfrm_selector) / sizeof(u32);
561 int i;
562
563 for (i = 0; i < len; i++) {
564 if (p1[i] != p2[i])
565 return 1;
566 }
567
568 return 0;
569 }
570
571 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
572 {
573 struct xfrm_policy *pol;
574 struct xfrm_policy *delpol;
575 struct hlist_head *chain;
576 struct hlist_node *entry, *newpos;
577 struct dst_entry *gc_list;
578
579 write_lock_bh(&xfrm_policy_lock);
580 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
581 delpol = NULL;
582 newpos = NULL;
583 hlist_for_each_entry(pol, entry, chain, bydst) {
584 if (pol->type == policy->type &&
585 !selector_cmp(&pol->selector, &policy->selector) &&
586 xfrm_sec_ctx_match(pol->security, policy->security) &&
587 !WARN_ON(delpol)) {
588 if (excl) {
589 write_unlock_bh(&xfrm_policy_lock);
590 return -EEXIST;
591 }
592 delpol = pol;
593 if (policy->priority > pol->priority)
594 continue;
595 } else if (policy->priority >= pol->priority) {
596 newpos = &pol->bydst;
597 continue;
598 }
599 if (delpol)
600 break;
601 }
602 if (newpos)
603 hlist_add_after(newpos, &policy->bydst);
604 else
605 hlist_add_head(&policy->bydst, chain);
606 xfrm_pol_hold(policy);
607 xfrm_policy_count[dir]++;
608 atomic_inc(&flow_cache_genid);
609 if (delpol) {
610 hlist_del(&delpol->bydst);
611 hlist_del(&delpol->byidx);
612 xfrm_policy_count[dir]--;
613 }
614 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
615 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
616 policy->curlft.add_time = get_seconds();
617 policy->curlft.use_time = 0;
618 if (!mod_timer(&policy->timer, jiffies + HZ))
619 xfrm_pol_hold(policy);
620 list_add_tail(&policy->bytype, &xfrm_policy_bytype[policy->type]);
621 write_unlock_bh(&xfrm_policy_lock);
622
623 if (delpol)
624 xfrm_policy_kill(delpol);
625 else if (xfrm_bydst_should_resize(dir, NULL))
626 schedule_work(&xfrm_hash_work);
627
628 read_lock_bh(&xfrm_policy_lock);
629 gc_list = NULL;
630 entry = &policy->bydst;
631 hlist_for_each_entry_continue(policy, entry, bydst) {
632 struct dst_entry *dst;
633
634 write_lock(&policy->lock);
635 dst = policy->bundles;
636 if (dst) {
637 struct dst_entry *tail = dst;
638 while (tail->next)
639 tail = tail->next;
640 tail->next = gc_list;
641 gc_list = dst;
642
643 policy->bundles = NULL;
644 }
645 write_unlock(&policy->lock);
646 }
647 read_unlock_bh(&xfrm_policy_lock);
648
649 while (gc_list) {
650 struct dst_entry *dst = gc_list;
651
652 gc_list = dst->next;
653 dst_free(dst);
654 }
655
656 return 0;
657 }
658 EXPORT_SYMBOL(xfrm_policy_insert);
659
660 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
661 struct xfrm_selector *sel,
662 struct xfrm_sec_ctx *ctx, int delete,
663 int *err)
664 {
665 struct xfrm_policy *pol, *ret;
666 struct hlist_head *chain;
667 struct hlist_node *entry;
668
669 *err = 0;
670 write_lock_bh(&xfrm_policy_lock);
671 chain = policy_hash_bysel(sel, sel->family, dir);
672 ret = NULL;
673 hlist_for_each_entry(pol, entry, chain, bydst) {
674 if (pol->type == type &&
675 !selector_cmp(sel, &pol->selector) &&
676 xfrm_sec_ctx_match(ctx, pol->security)) {
677 xfrm_pol_hold(pol);
678 if (delete) {
679 *err = security_xfrm_policy_delete(
680 pol->security);
681 if (*err) {
682 write_unlock_bh(&xfrm_policy_lock);
683 return pol;
684 }
685 hlist_del(&pol->bydst);
686 hlist_del(&pol->byidx);
687 xfrm_policy_count[dir]--;
688 }
689 ret = pol;
690 break;
691 }
692 }
693 write_unlock_bh(&xfrm_policy_lock);
694
695 if (ret && delete) {
696 atomic_inc(&flow_cache_genid);
697 xfrm_policy_kill(ret);
698 }
699 return ret;
700 }
701 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
702
703 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
704 int *err)
705 {
706 struct xfrm_policy *pol, *ret;
707 struct hlist_head *chain;
708 struct hlist_node *entry;
709
710 *err = -ENOENT;
711 if (xfrm_policy_id2dir(id) != dir)
712 return NULL;
713
714 *err = 0;
715 write_lock_bh(&xfrm_policy_lock);
716 chain = xfrm_policy_byidx + idx_hash(id);
717 ret = NULL;
718 hlist_for_each_entry(pol, entry, chain, byidx) {
719 if (pol->type == type && pol->index == id) {
720 xfrm_pol_hold(pol);
721 if (delete) {
722 *err = security_xfrm_policy_delete(
723 pol->security);
724 if (*err) {
725 write_unlock_bh(&xfrm_policy_lock);
726 return pol;
727 }
728 hlist_del(&pol->bydst);
729 hlist_del(&pol->byidx);
730 xfrm_policy_count[dir]--;
731 }
732 ret = pol;
733 break;
734 }
735 }
736 write_unlock_bh(&xfrm_policy_lock);
737
738 if (ret && delete) {
739 atomic_inc(&flow_cache_genid);
740 xfrm_policy_kill(ret);
741 }
742 return ret;
743 }
744 EXPORT_SYMBOL(xfrm_policy_byid);
745
746 #ifdef CONFIG_SECURITY_NETWORK_XFRM
747 static inline int
748 xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
749 {
750 int dir, err = 0;
751
752 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
753 struct xfrm_policy *pol;
754 struct hlist_node *entry;
755 int i;
756
757 hlist_for_each_entry(pol, entry,
758 &xfrm_policy_inexact[dir], bydst) {
759 if (pol->type != type)
760 continue;
761 err = security_xfrm_policy_delete(pol->security);
762 if (err) {
763 xfrm_audit_policy_delete(pol, 0,
764 audit_info->loginuid,
765 audit_info->sessionid,
766 audit_info->secid);
767 return err;
768 }
769 }
770 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
771 hlist_for_each_entry(pol, entry,
772 xfrm_policy_bydst[dir].table + i,
773 bydst) {
774 if (pol->type != type)
775 continue;
776 err = security_xfrm_policy_delete(
777 pol->security);
778 if (err) {
779 xfrm_audit_policy_delete(pol, 0,
780 audit_info->loginuid,
781 audit_info->sessionid,
782 audit_info->secid);
783 return err;
784 }
785 }
786 }
787 }
788 return err;
789 }
790 #else
791 static inline int
792 xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
793 {
794 return 0;
795 }
796 #endif
797
798 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
799 {
800 int dir, err = 0;
801
802 write_lock_bh(&xfrm_policy_lock);
803
804 err = xfrm_policy_flush_secctx_check(type, audit_info);
805 if (err)
806 goto out;
807
808 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
809 struct xfrm_policy *pol;
810 struct hlist_node *entry;
811 int i, killed;
812
813 killed = 0;
814 again1:
815 hlist_for_each_entry(pol, entry,
816 &xfrm_policy_inexact[dir], bydst) {
817 if (pol->type != type)
818 continue;
819 hlist_del(&pol->bydst);
820 hlist_del(&pol->byidx);
821 write_unlock_bh(&xfrm_policy_lock);
822
823 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
824 audit_info->sessionid,
825 audit_info->secid);
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_audit_policy_delete(pol, 1,
846 audit_info->loginuid,
847 audit_info->sessionid,
848 audit_info->secid);
849 xfrm_policy_kill(pol);
850 killed++;
851
852 write_lock_bh(&xfrm_policy_lock);
853 goto again2;
854 }
855 }
856
857 xfrm_policy_count[dir] -= killed;
858 }
859 atomic_inc(&flow_cache_genid);
860 out:
861 write_unlock_bh(&xfrm_policy_lock);
862 return err;
863 }
864 EXPORT_SYMBOL(xfrm_policy_flush);
865
866 int xfrm_policy_walk(struct xfrm_policy_walk *walk,
867 int (*func)(struct xfrm_policy *, int, int, void*),
868 void *data)
869 {
870 struct xfrm_policy *old, *pol, *last = NULL;
871 int error = 0;
872
873 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
874 walk->type != XFRM_POLICY_TYPE_ANY)
875 return -EINVAL;
876
877 if (walk->policy == NULL && walk->count != 0)
878 return 0;
879
880 old = pol = walk->policy;
881 walk->policy = NULL;
882 read_lock_bh(&xfrm_policy_lock);
883
884 for (; walk->cur_type < XFRM_POLICY_TYPE_MAX; walk->cur_type++) {
885 if (walk->type != walk->cur_type &&
886 walk->type != XFRM_POLICY_TYPE_ANY)
887 continue;
888
889 if (pol == NULL) {
890 pol = list_first_entry(&xfrm_policy_bytype[walk->cur_type],
891 struct xfrm_policy, bytype);
892 }
893 list_for_each_entry_from(pol, &xfrm_policy_bytype[walk->cur_type], bytype) {
894 if (pol->dead)
895 continue;
896 if (last) {
897 error = func(last, xfrm_policy_id2dir(last->index),
898 walk->count, data);
899 if (error) {
900 xfrm_pol_hold(last);
901 walk->policy = last;
902 goto out;
903 }
904 }
905 last = pol;
906 walk->count++;
907 }
908 pol = NULL;
909 }
910 if (walk->count == 0) {
911 error = -ENOENT;
912 goto out;
913 }
914 if (last)
915 error = func(last, xfrm_policy_id2dir(last->index), 0, data);
916 out:
917 read_unlock_bh(&xfrm_policy_lock);
918 if (old != NULL)
919 xfrm_pol_put(old);
920 return error;
921 }
922 EXPORT_SYMBOL(xfrm_policy_walk);
923
924 /*
925 * Find policy to apply to this flow.
926 *
927 * Returns 0 if policy found, else an -errno.
928 */
929 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
930 u8 type, u16 family, int dir)
931 {
932 struct xfrm_selector *sel = &pol->selector;
933 int match, ret = -ESRCH;
934
935 if (pol->family != family ||
936 pol->type != type)
937 return ret;
938
939 match = xfrm_selector_match(sel, fl, family);
940 if (match)
941 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
942 dir);
943
944 return ret;
945 }
946
947 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
948 u16 family, u8 dir)
949 {
950 int err;
951 struct xfrm_policy *pol, *ret;
952 xfrm_address_t *daddr, *saddr;
953 struct hlist_node *entry;
954 struct hlist_head *chain;
955 u32 priority = ~0U;
956
957 daddr = xfrm_flowi_daddr(fl, family);
958 saddr = xfrm_flowi_saddr(fl, family);
959 if (unlikely(!daddr || !saddr))
960 return NULL;
961
962 read_lock_bh(&xfrm_policy_lock);
963 chain = policy_hash_direct(daddr, saddr, family, dir);
964 ret = NULL;
965 hlist_for_each_entry(pol, entry, chain, bydst) {
966 err = xfrm_policy_match(pol, fl, type, family, dir);
967 if (err) {
968 if (err == -ESRCH)
969 continue;
970 else {
971 ret = ERR_PTR(err);
972 goto fail;
973 }
974 } else {
975 ret = pol;
976 priority = ret->priority;
977 break;
978 }
979 }
980 chain = &xfrm_policy_inexact[dir];
981 hlist_for_each_entry(pol, entry, chain, bydst) {
982 err = xfrm_policy_match(pol, fl, type, family, dir);
983 if (err) {
984 if (err == -ESRCH)
985 continue;
986 else {
987 ret = ERR_PTR(err);
988 goto fail;
989 }
990 } else if (pol->priority < priority) {
991 ret = pol;
992 break;
993 }
994 }
995 if (ret)
996 xfrm_pol_hold(ret);
997 fail:
998 read_unlock_bh(&xfrm_policy_lock);
999
1000 return ret;
1001 }
1002
1003 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
1004 void **objp, atomic_t **obj_refp)
1005 {
1006 struct xfrm_policy *pol;
1007 int err = 0;
1008
1009 #ifdef CONFIG_XFRM_SUB_POLICY
1010 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
1011 if (IS_ERR(pol)) {
1012 err = PTR_ERR(pol);
1013 pol = NULL;
1014 }
1015 if (pol || err)
1016 goto end;
1017 #endif
1018 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1019 if (IS_ERR(pol)) {
1020 err = PTR_ERR(pol);
1021 pol = NULL;
1022 }
1023 #ifdef CONFIG_XFRM_SUB_POLICY
1024 end:
1025 #endif
1026 if ((*objp = (void *) pol) != NULL)
1027 *obj_refp = &pol->refcnt;
1028 return err;
1029 }
1030
1031 static inline int policy_to_flow_dir(int dir)
1032 {
1033 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1034 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1035 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1036 return dir;
1037 switch (dir) {
1038 default:
1039 case XFRM_POLICY_IN:
1040 return FLOW_DIR_IN;
1041 case XFRM_POLICY_OUT:
1042 return FLOW_DIR_OUT;
1043 case XFRM_POLICY_FWD:
1044 return FLOW_DIR_FWD;
1045 }
1046 }
1047
1048 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1049 {
1050 struct xfrm_policy *pol;
1051
1052 read_lock_bh(&xfrm_policy_lock);
1053 if ((pol = sk->sk_policy[dir]) != NULL) {
1054 int match = xfrm_selector_match(&pol->selector, fl,
1055 sk->sk_family);
1056 int err = 0;
1057
1058 if (match) {
1059 err = security_xfrm_policy_lookup(pol->security,
1060 fl->secid,
1061 policy_to_flow_dir(dir));
1062 if (!err)
1063 xfrm_pol_hold(pol);
1064 else if (err == -ESRCH)
1065 pol = NULL;
1066 else
1067 pol = ERR_PTR(err);
1068 } else
1069 pol = NULL;
1070 }
1071 read_unlock_bh(&xfrm_policy_lock);
1072 return pol;
1073 }
1074
1075 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1076 {
1077 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1078 pol->family, dir);
1079
1080 hlist_add_head(&pol->bydst, chain);
1081 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1082 xfrm_policy_count[dir]++;
1083 xfrm_pol_hold(pol);
1084
1085 if (xfrm_bydst_should_resize(dir, NULL))
1086 schedule_work(&xfrm_hash_work);
1087 }
1088
1089 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1090 int dir)
1091 {
1092 if (hlist_unhashed(&pol->bydst))
1093 return NULL;
1094
1095 hlist_del(&pol->bydst);
1096 hlist_del(&pol->byidx);
1097 xfrm_policy_count[dir]--;
1098
1099 return pol;
1100 }
1101
1102 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1103 {
1104 write_lock_bh(&xfrm_policy_lock);
1105 pol = __xfrm_policy_unlink(pol, dir);
1106 write_unlock_bh(&xfrm_policy_lock);
1107 if (pol) {
1108 if (dir < XFRM_POLICY_MAX)
1109 atomic_inc(&flow_cache_genid);
1110 xfrm_policy_kill(pol);
1111 return 0;
1112 }
1113 return -ENOENT;
1114 }
1115 EXPORT_SYMBOL(xfrm_policy_delete);
1116
1117 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1118 {
1119 struct xfrm_policy *old_pol;
1120
1121 #ifdef CONFIG_XFRM_SUB_POLICY
1122 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1123 return -EINVAL;
1124 #endif
1125
1126 write_lock_bh(&xfrm_policy_lock);
1127 old_pol = sk->sk_policy[dir];
1128 sk->sk_policy[dir] = pol;
1129 if (pol) {
1130 pol->curlft.add_time = get_seconds();
1131 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1132 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1133 }
1134 if (old_pol)
1135 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1136 write_unlock_bh(&xfrm_policy_lock);
1137
1138 if (old_pol) {
1139 xfrm_policy_kill(old_pol);
1140 }
1141 return 0;
1142 }
1143
1144 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1145 {
1146 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1147
1148 if (newp) {
1149 newp->selector = old->selector;
1150 if (security_xfrm_policy_clone(old->security,
1151 &newp->security)) {
1152 kfree(newp);
1153 return NULL; /* ENOMEM */
1154 }
1155 newp->lft = old->lft;
1156 newp->curlft = old->curlft;
1157 newp->action = old->action;
1158 newp->flags = old->flags;
1159 newp->xfrm_nr = old->xfrm_nr;
1160 newp->index = old->index;
1161 newp->type = old->type;
1162 memcpy(newp->xfrm_vec, old->xfrm_vec,
1163 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1164 write_lock_bh(&xfrm_policy_lock);
1165 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1166 write_unlock_bh(&xfrm_policy_lock);
1167 xfrm_pol_put(newp);
1168 }
1169 return newp;
1170 }
1171
1172 int __xfrm_sk_clone_policy(struct sock *sk)
1173 {
1174 struct xfrm_policy *p0 = sk->sk_policy[0],
1175 *p1 = sk->sk_policy[1];
1176
1177 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1178 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1179 return -ENOMEM;
1180 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1181 return -ENOMEM;
1182 return 0;
1183 }
1184
1185 static int
1186 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1187 unsigned short family)
1188 {
1189 int err;
1190 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1191
1192 if (unlikely(afinfo == NULL))
1193 return -EINVAL;
1194 err = afinfo->get_saddr(local, remote);
1195 xfrm_policy_put_afinfo(afinfo);
1196 return err;
1197 }
1198
1199 /* Resolve list of templates for the flow, given policy. */
1200
1201 static int
1202 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1203 struct xfrm_state **xfrm,
1204 unsigned short family)
1205 {
1206 int nx;
1207 int i, error;
1208 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1209 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1210 xfrm_address_t tmp;
1211
1212 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1213 struct xfrm_state *x;
1214 xfrm_address_t *remote = daddr;
1215 xfrm_address_t *local = saddr;
1216 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1217
1218 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1219 tmpl->mode == XFRM_MODE_BEET) {
1220 remote = &tmpl->id.daddr;
1221 local = &tmpl->saddr;
1222 family = tmpl->encap_family;
1223 if (xfrm_addr_any(local, family)) {
1224 error = xfrm_get_saddr(&tmp, remote, family);
1225 if (error)
1226 goto fail;
1227 local = &tmp;
1228 }
1229 }
1230
1231 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1232
1233 if (x && x->km.state == XFRM_STATE_VALID) {
1234 xfrm[nx++] = x;
1235 daddr = remote;
1236 saddr = local;
1237 continue;
1238 }
1239 if (x) {
1240 error = (x->km.state == XFRM_STATE_ERROR ?
1241 -EINVAL : -EAGAIN);
1242 xfrm_state_put(x);
1243 }
1244
1245 if (!tmpl->optional)
1246 goto fail;
1247 }
1248 return nx;
1249
1250 fail:
1251 for (nx--; nx>=0; nx--)
1252 xfrm_state_put(xfrm[nx]);
1253 return error;
1254 }
1255
1256 static int
1257 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1258 struct xfrm_state **xfrm,
1259 unsigned short family)
1260 {
1261 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1262 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1263 int cnx = 0;
1264 int error;
1265 int ret;
1266 int i;
1267
1268 for (i = 0; i < npols; i++) {
1269 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1270 error = -ENOBUFS;
1271 goto fail;
1272 }
1273
1274 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1275 if (ret < 0) {
1276 error = ret;
1277 goto fail;
1278 } else
1279 cnx += ret;
1280 }
1281
1282 /* found states are sorted for outbound processing */
1283 if (npols > 1)
1284 xfrm_state_sort(xfrm, tpp, cnx, family);
1285
1286 return cnx;
1287
1288 fail:
1289 for (cnx--; cnx>=0; cnx--)
1290 xfrm_state_put(tpp[cnx]);
1291 return error;
1292
1293 }
1294
1295 /* Check that the bundle accepts the flow and its components are
1296 * still valid.
1297 */
1298
1299 static struct dst_entry *
1300 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1301 {
1302 struct dst_entry *x;
1303 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1304 if (unlikely(afinfo == NULL))
1305 return ERR_PTR(-EINVAL);
1306 x = afinfo->find_bundle(fl, policy);
1307 xfrm_policy_put_afinfo(afinfo);
1308 return x;
1309 }
1310
1311 static inline int xfrm_get_tos(struct flowi *fl, int family)
1312 {
1313 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1314 int tos;
1315
1316 if (!afinfo)
1317 return -EINVAL;
1318
1319 tos = afinfo->get_tos(fl);
1320
1321 xfrm_policy_put_afinfo(afinfo);
1322
1323 return tos;
1324 }
1325
1326 static inline struct xfrm_dst *xfrm_alloc_dst(int family)
1327 {
1328 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1329 struct xfrm_dst *xdst;
1330
1331 if (!afinfo)
1332 return ERR_PTR(-EINVAL);
1333
1334 xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS);
1335
1336 xfrm_policy_put_afinfo(afinfo);
1337
1338 return xdst;
1339 }
1340
1341 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1342 int nfheader_len)
1343 {
1344 struct xfrm_policy_afinfo *afinfo =
1345 xfrm_policy_get_afinfo(dst->ops->family);
1346 int err;
1347
1348 if (!afinfo)
1349 return -EINVAL;
1350
1351 err = afinfo->init_path(path, dst, nfheader_len);
1352
1353 xfrm_policy_put_afinfo(afinfo);
1354
1355 return err;
1356 }
1357
1358 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
1359 {
1360 struct xfrm_policy_afinfo *afinfo =
1361 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1362 int err;
1363
1364 if (!afinfo)
1365 return -EINVAL;
1366
1367 err = afinfo->fill_dst(xdst, dev);
1368
1369 xfrm_policy_put_afinfo(afinfo);
1370
1371 return err;
1372 }
1373
1374 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1375 * all the metrics... Shortly, bundle a bundle.
1376 */
1377
1378 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1379 struct xfrm_state **xfrm, int nx,
1380 struct flowi *fl,
1381 struct dst_entry *dst)
1382 {
1383 unsigned long now = jiffies;
1384 struct net_device *dev;
1385 struct dst_entry *dst_prev = NULL;
1386 struct dst_entry *dst0 = NULL;
1387 int i = 0;
1388 int err;
1389 int header_len = 0;
1390 int nfheader_len = 0;
1391 int trailer_len = 0;
1392 int tos;
1393 int family = policy->selector.family;
1394 xfrm_address_t saddr, daddr;
1395
1396 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1397
1398 tos = xfrm_get_tos(fl, family);
1399 err = tos;
1400 if (tos < 0)
1401 goto put_states;
1402
1403 dst_hold(dst);
1404
1405 for (; i < nx; i++) {
1406 struct xfrm_dst *xdst = xfrm_alloc_dst(family);
1407 struct dst_entry *dst1 = &xdst->u.dst;
1408
1409 err = PTR_ERR(xdst);
1410 if (IS_ERR(xdst)) {
1411 dst_release(dst);
1412 goto put_states;
1413 }
1414
1415 if (!dst_prev)
1416 dst0 = dst1;
1417 else {
1418 dst_prev->child = dst_clone(dst1);
1419 dst1->flags |= DST_NOHASH;
1420 }
1421
1422 xdst->route = dst;
1423 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1424
1425 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1426 family = xfrm[i]->props.family;
1427 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1428 family);
1429 err = PTR_ERR(dst);
1430 if (IS_ERR(dst))
1431 goto put_states;
1432 } else
1433 dst_hold(dst);
1434
1435 dst1->xfrm = xfrm[i];
1436 xdst->genid = xfrm[i]->genid;
1437
1438 dst1->obsolete = -1;
1439 dst1->flags |= DST_HOST;
1440 dst1->lastuse = now;
1441
1442 dst1->input = dst_discard;
1443 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1444
1445 dst1->next = dst_prev;
1446 dst_prev = dst1;
1447
1448 header_len += xfrm[i]->props.header_len;
1449 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1450 nfheader_len += xfrm[i]->props.header_len;
1451 trailer_len += xfrm[i]->props.trailer_len;
1452 }
1453
1454 dst_prev->child = dst;
1455 dst0->path = dst;
1456
1457 err = -ENODEV;
1458 dev = dst->dev;
1459 if (!dev)
1460 goto free_dst;
1461
1462 /* Copy neighbout for reachability confirmation */
1463 dst0->neighbour = neigh_clone(dst->neighbour);
1464
1465 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1466 xfrm_init_pmtu(dst_prev);
1467
1468 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1469 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1470
1471 err = xfrm_fill_dst(xdst, dev);
1472 if (err)
1473 goto free_dst;
1474
1475 dst_prev->header_len = header_len;
1476 dst_prev->trailer_len = trailer_len;
1477 header_len -= xdst->u.dst.xfrm->props.header_len;
1478 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1479 }
1480
1481 out:
1482 return dst0;
1483
1484 put_states:
1485 for (; i < nx; i++)
1486 xfrm_state_put(xfrm[i]);
1487 free_dst:
1488 if (dst0)
1489 dst_free(dst0);
1490 dst0 = ERR_PTR(err);
1491 goto out;
1492 }
1493
1494 static int inline
1495 xfrm_dst_alloc_copy(void **target, void *src, int size)
1496 {
1497 if (!*target) {
1498 *target = kmalloc(size, GFP_ATOMIC);
1499 if (!*target)
1500 return -ENOMEM;
1501 }
1502 memcpy(*target, src, size);
1503 return 0;
1504 }
1505
1506 static int inline
1507 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1508 {
1509 #ifdef CONFIG_XFRM_SUB_POLICY
1510 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1511 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1512 sel, sizeof(*sel));
1513 #else
1514 return 0;
1515 #endif
1516 }
1517
1518 static int inline
1519 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1520 {
1521 #ifdef CONFIG_XFRM_SUB_POLICY
1522 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1523 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1524 #else
1525 return 0;
1526 #endif
1527 }
1528
1529 static int stale_bundle(struct dst_entry *dst);
1530
1531 /* Main function: finds/creates a bundle for given flow.
1532 *
1533 * At the moment we eat a raw IP route. Mostly to speed up lookups
1534 * on interfaces with disabled IPsec.
1535 */
1536 int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1537 struct sock *sk, int flags)
1538 {
1539 struct xfrm_policy *policy;
1540 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1541 int npols;
1542 int pol_dead;
1543 int xfrm_nr;
1544 int pi;
1545 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1546 struct dst_entry *dst, *dst_orig = *dst_p;
1547 int nx = 0;
1548 int err;
1549 u32 genid;
1550 u16 family;
1551 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1552
1553 restart:
1554 genid = atomic_read(&flow_cache_genid);
1555 policy = NULL;
1556 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1557 pols[pi] = NULL;
1558 npols = 0;
1559 pol_dead = 0;
1560 xfrm_nr = 0;
1561
1562 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1563 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1564 err = PTR_ERR(policy);
1565 if (IS_ERR(policy)) {
1566 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
1567 goto dropdst;
1568 }
1569 }
1570
1571 if (!policy) {
1572 /* To accelerate a bit... */
1573 if ((dst_orig->flags & DST_NOXFRM) ||
1574 !xfrm_policy_count[XFRM_POLICY_OUT])
1575 goto nopol;
1576
1577 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1578 dir, xfrm_policy_lookup);
1579 err = PTR_ERR(policy);
1580 if (IS_ERR(policy)) {
1581 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
1582 goto dropdst;
1583 }
1584 }
1585
1586 if (!policy)
1587 goto nopol;
1588
1589 family = dst_orig->ops->family;
1590 pols[0] = policy;
1591 npols ++;
1592 xfrm_nr += pols[0]->xfrm_nr;
1593
1594 err = -ENOENT;
1595 if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
1596 goto error;
1597
1598 policy->curlft.use_time = get_seconds();
1599
1600 switch (policy->action) {
1601 default:
1602 case XFRM_POLICY_BLOCK:
1603 /* Prohibit the flow */
1604 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
1605 err = -EPERM;
1606 goto error;
1607
1608 case XFRM_POLICY_ALLOW:
1609 #ifndef CONFIG_XFRM_SUB_POLICY
1610 if (policy->xfrm_nr == 0) {
1611 /* Flow passes not transformed. */
1612 xfrm_pol_put(policy);
1613 return 0;
1614 }
1615 #endif
1616
1617 /* Try to find matching bundle.
1618 *
1619 * LATER: help from flow cache. It is optional, this
1620 * is required only for output policy.
1621 */
1622 dst = xfrm_find_bundle(fl, policy, family);
1623 if (IS_ERR(dst)) {
1624 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1625 err = PTR_ERR(dst);
1626 goto error;
1627 }
1628
1629 if (dst)
1630 break;
1631
1632 #ifdef CONFIG_XFRM_SUB_POLICY
1633 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1634 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1635 fl, family,
1636 XFRM_POLICY_OUT);
1637 if (pols[1]) {
1638 if (IS_ERR(pols[1])) {
1639 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
1640 err = PTR_ERR(pols[1]);
1641 goto error;
1642 }
1643 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1644 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
1645 err = -EPERM;
1646 goto error;
1647 }
1648 npols ++;
1649 xfrm_nr += pols[1]->xfrm_nr;
1650 }
1651 }
1652
1653 /*
1654 * Because neither flowi nor bundle information knows about
1655 * transformation template size. On more than one policy usage
1656 * we can realize whether all of them is bypass or not after
1657 * they are searched. See above not-transformed bypass
1658 * is surrounded by non-sub policy configuration, too.
1659 */
1660 if (xfrm_nr == 0) {
1661 /* Flow passes not transformed. */
1662 xfrm_pols_put(pols, npols);
1663 return 0;
1664 }
1665
1666 #endif
1667 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1668
1669 if (unlikely(nx<0)) {
1670 err = nx;
1671 if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
1672 /* EREMOTE tells the caller to generate
1673 * a one-shot blackhole route.
1674 */
1675 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1676 xfrm_pol_put(policy);
1677 return -EREMOTE;
1678 }
1679 if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
1680 DECLARE_WAITQUEUE(wait, current);
1681
1682 add_wait_queue(&km_waitq, &wait);
1683 set_current_state(TASK_INTERRUPTIBLE);
1684 schedule();
1685 set_current_state(TASK_RUNNING);
1686 remove_wait_queue(&km_waitq, &wait);
1687
1688 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1689
1690 if (nx == -EAGAIN && signal_pending(current)) {
1691 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1692 err = -ERESTART;
1693 goto error;
1694 }
1695 if (nx == -EAGAIN ||
1696 genid != atomic_read(&flow_cache_genid)) {
1697 xfrm_pols_put(pols, npols);
1698 goto restart;
1699 }
1700 err = nx;
1701 }
1702 if (err < 0) {
1703 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1704 goto error;
1705 }
1706 }
1707 if (nx == 0) {
1708 /* Flow passes not transformed. */
1709 xfrm_pols_put(pols, npols);
1710 return 0;
1711 }
1712
1713 dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
1714 err = PTR_ERR(dst);
1715 if (IS_ERR(dst)) {
1716 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1717 goto error;
1718 }
1719
1720 for (pi = 0; pi < npols; pi++) {
1721 read_lock_bh(&pols[pi]->lock);
1722 pol_dead |= pols[pi]->dead;
1723 read_unlock_bh(&pols[pi]->lock);
1724 }
1725
1726 write_lock_bh(&policy->lock);
1727 if (unlikely(pol_dead || stale_bundle(dst))) {
1728 /* Wow! While we worked on resolving, this
1729 * policy has gone. Retry. It is not paranoia,
1730 * we just cannot enlist new bundle to dead object.
1731 * We can't enlist stable bundles either.
1732 */
1733 write_unlock_bh(&policy->lock);
1734 if (dst)
1735 dst_free(dst);
1736
1737 if (pol_dead)
1738 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
1739 else
1740 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1741 err = -EHOSTUNREACH;
1742 goto error;
1743 }
1744
1745 if (npols > 1)
1746 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1747 else
1748 err = xfrm_dst_update_origin(dst, fl);
1749 if (unlikely(err)) {
1750 write_unlock_bh(&policy->lock);
1751 if (dst)
1752 dst_free(dst);
1753 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1754 goto error;
1755 }
1756
1757 dst->next = policy->bundles;
1758 policy->bundles = dst;
1759 dst_hold(dst);
1760 write_unlock_bh(&policy->lock);
1761 }
1762 *dst_p = dst;
1763 dst_release(dst_orig);
1764 xfrm_pols_put(pols, npols);
1765 return 0;
1766
1767 error:
1768 xfrm_pols_put(pols, npols);
1769 dropdst:
1770 dst_release(dst_orig);
1771 *dst_p = NULL;
1772 return err;
1773
1774 nopol:
1775 err = -ENOENT;
1776 if (flags & XFRM_LOOKUP_ICMP)
1777 goto dropdst;
1778 return 0;
1779 }
1780 EXPORT_SYMBOL(__xfrm_lookup);
1781
1782 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1783 struct sock *sk, int flags)
1784 {
1785 int err = __xfrm_lookup(dst_p, fl, sk, flags);
1786
1787 if (err == -EREMOTE) {
1788 dst_release(*dst_p);
1789 *dst_p = NULL;
1790 err = -EAGAIN;
1791 }
1792
1793 return err;
1794 }
1795 EXPORT_SYMBOL(xfrm_lookup);
1796
1797 static inline int
1798 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1799 {
1800 struct xfrm_state *x;
1801
1802 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1803 return 0;
1804 x = skb->sp->xvec[idx];
1805 if (!x->type->reject)
1806 return 0;
1807 return x->type->reject(x, skb, fl);
1808 }
1809
1810 /* When skb is transformed back to its "native" form, we have to
1811 * check policy restrictions. At the moment we make this in maximally
1812 * stupid way. Shame on me. :-) Of course, connected sockets must
1813 * have policy cached at them.
1814 */
1815
1816 static inline int
1817 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1818 unsigned short family)
1819 {
1820 if (xfrm_state_kern(x))
1821 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1822 return x->id.proto == tmpl->id.proto &&
1823 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1824 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1825 x->props.mode == tmpl->mode &&
1826 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1827 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1828 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1829 xfrm_state_addr_cmp(tmpl, x, family));
1830 }
1831
1832 /*
1833 * 0 or more than 0 is returned when validation is succeeded (either bypass
1834 * because of optional transport mode, or next index of the mathced secpath
1835 * state with the template.
1836 * -1 is returned when no matching template is found.
1837 * Otherwise "-2 - errored_index" is returned.
1838 */
1839 static inline int
1840 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1841 unsigned short family)
1842 {
1843 int idx = start;
1844
1845 if (tmpl->optional) {
1846 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1847 return start;
1848 } else
1849 start = -1;
1850 for (; idx < sp->len; idx++) {
1851 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1852 return ++idx;
1853 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1854 if (start == -1)
1855 start = -2-idx;
1856 break;
1857 }
1858 }
1859 return start;
1860 }
1861
1862 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1863 unsigned int family, int reverse)
1864 {
1865 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1866 int err;
1867
1868 if (unlikely(afinfo == NULL))
1869 return -EAFNOSUPPORT;
1870
1871 afinfo->decode_session(skb, fl, reverse);
1872 err = security_xfrm_decode_session(skb, &fl->secid);
1873 xfrm_policy_put_afinfo(afinfo);
1874 return err;
1875 }
1876 EXPORT_SYMBOL(__xfrm_decode_session);
1877
1878 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1879 {
1880 for (; k < sp->len; k++) {
1881 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1882 *idxp = k;
1883 return 1;
1884 }
1885 }
1886
1887 return 0;
1888 }
1889
1890 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1891 unsigned short family)
1892 {
1893 struct xfrm_policy *pol;
1894 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1895 int npols = 0;
1896 int xfrm_nr;
1897 int pi;
1898 int reverse;
1899 struct flowi fl;
1900 u8 fl_dir;
1901 int xerr_idx = -1;
1902
1903 reverse = dir & ~XFRM_POLICY_MASK;
1904 dir &= XFRM_POLICY_MASK;
1905 fl_dir = policy_to_flow_dir(dir);
1906
1907 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
1908 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
1909 return 0;
1910 }
1911
1912 nf_nat_decode_session(skb, &fl, family);
1913
1914 /* First, check used SA against their selectors. */
1915 if (skb->sp) {
1916 int i;
1917
1918 for (i=skb->sp->len-1; i>=0; i--) {
1919 struct xfrm_state *x = skb->sp->xvec[i];
1920 if (!xfrm_selector_match(&x->sel, &fl, family)) {
1921 XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
1922 return 0;
1923 }
1924 }
1925 }
1926
1927 pol = NULL;
1928 if (sk && sk->sk_policy[dir]) {
1929 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1930 if (IS_ERR(pol)) {
1931 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
1932 return 0;
1933 }
1934 }
1935
1936 if (!pol)
1937 pol = flow_cache_lookup(&fl, family, fl_dir,
1938 xfrm_policy_lookup);
1939
1940 if (IS_ERR(pol)) {
1941 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
1942 return 0;
1943 }
1944
1945 if (!pol) {
1946 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1947 xfrm_secpath_reject(xerr_idx, skb, &fl);
1948 XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS);
1949 return 0;
1950 }
1951 return 1;
1952 }
1953
1954 pol->curlft.use_time = get_seconds();
1955
1956 pols[0] = pol;
1957 npols ++;
1958 #ifdef CONFIG_XFRM_SUB_POLICY
1959 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1960 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1961 &fl, family,
1962 XFRM_POLICY_IN);
1963 if (pols[1]) {
1964 if (IS_ERR(pols[1])) {
1965 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
1966 return 0;
1967 }
1968 pols[1]->curlft.use_time = get_seconds();
1969 npols ++;
1970 }
1971 }
1972 #endif
1973
1974 if (pol->action == XFRM_POLICY_ALLOW) {
1975 struct sec_path *sp;
1976 static struct sec_path dummy;
1977 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1978 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1979 struct xfrm_tmpl **tpp = tp;
1980 int ti = 0;
1981 int i, k;
1982
1983 if ((sp = skb->sp) == NULL)
1984 sp = &dummy;
1985
1986 for (pi = 0; pi < npols; pi++) {
1987 if (pols[pi] != pol &&
1988 pols[pi]->action != XFRM_POLICY_ALLOW) {
1989 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
1990 goto reject;
1991 }
1992 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
1993 XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
1994 goto reject_error;
1995 }
1996 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1997 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1998 }
1999 xfrm_nr = ti;
2000 if (npols > 1) {
2001 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2002 tpp = stp;
2003 }
2004
2005 /* For each tunnel xfrm, find the first matching tmpl.
2006 * For each tmpl before that, find corresponding xfrm.
2007 * Order is _important_. Later we will implement
2008 * some barriers, but at the moment barriers
2009 * are implied between each two transformations.
2010 */
2011 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2012 k = xfrm_policy_ok(tpp[i], sp, k, family);
2013 if (k < 0) {
2014 if (k < -1)
2015 /* "-2 - errored_index" returned */
2016 xerr_idx = -(2+k);
2017 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
2018 goto reject;
2019 }
2020 }
2021
2022 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2023 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
2024 goto reject;
2025 }
2026
2027 xfrm_pols_put(pols, npols);
2028 return 1;
2029 }
2030 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
2031
2032 reject:
2033 xfrm_secpath_reject(xerr_idx, skb, &fl);
2034 reject_error:
2035 xfrm_pols_put(pols, npols);
2036 return 0;
2037 }
2038 EXPORT_SYMBOL(__xfrm_policy_check);
2039
2040 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2041 {
2042 struct flowi fl;
2043
2044 if (xfrm_decode_session(skb, &fl, family) < 0) {
2045 /* XXX: we should have something like FWDHDRERROR here. */
2046 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
2047 return 0;
2048 }
2049
2050 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
2051 }
2052 EXPORT_SYMBOL(__xfrm_route_forward);
2053
2054 /* Optimize later using cookies and generation ids. */
2055
2056 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2057 {
2058 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2059 * to "-1" to force all XFRM destinations to get validated by
2060 * dst_ops->check on every use. We do this because when a
2061 * normal route referenced by an XFRM dst is obsoleted we do
2062 * not go looking around for all parent referencing XFRM dsts
2063 * so that we can invalidate them. It is just too much work.
2064 * Instead we make the checks here on every use. For example:
2065 *
2066 * XFRM dst A --> IPv4 dst X
2067 *
2068 * X is the "xdst->route" of A (X is also the "dst->path" of A
2069 * in this example). If X is marked obsolete, "A" will not
2070 * notice. That's what we are validating here via the
2071 * stale_bundle() check.
2072 *
2073 * When a policy's bundle is pruned, we dst_free() the XFRM
2074 * dst which causes it's ->obsolete field to be set to a
2075 * positive non-zero integer. If an XFRM dst has been pruned
2076 * like this, we want to force a new route lookup.
2077 */
2078 if (dst->obsolete < 0 && !stale_bundle(dst))
2079 return dst;
2080
2081 return NULL;
2082 }
2083
2084 static int stale_bundle(struct dst_entry *dst)
2085 {
2086 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2087 }
2088
2089 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2090 {
2091 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2092 dst->dev = dev_net(dev)->loopback_dev;
2093 dev_hold(dst->dev);
2094 dev_put(dev);
2095 }
2096 }
2097 EXPORT_SYMBOL(xfrm_dst_ifdown);
2098
2099 static void xfrm_link_failure(struct sk_buff *skb)
2100 {
2101 /* Impossible. Such dst must be popped before reaches point of failure. */
2102 return;
2103 }
2104
2105 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2106 {
2107 if (dst) {
2108 if (dst->obsolete) {
2109 dst_release(dst);
2110 dst = NULL;
2111 }
2112 }
2113 return dst;
2114 }
2115
2116 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
2117 {
2118 struct dst_entry *dst, **dstp;
2119
2120 write_lock(&pol->lock);
2121 dstp = &pol->bundles;
2122 while ((dst=*dstp) != NULL) {
2123 if (func(dst)) {
2124 *dstp = dst->next;
2125 dst->next = *gc_list_p;
2126 *gc_list_p = dst;
2127 } else {
2128 dstp = &dst->next;
2129 }
2130 }
2131 write_unlock(&pol->lock);
2132 }
2133
2134 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
2135 {
2136 struct dst_entry *gc_list = NULL;
2137 int dir;
2138
2139 read_lock_bh(&xfrm_policy_lock);
2140 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2141 struct xfrm_policy *pol;
2142 struct hlist_node *entry;
2143 struct hlist_head *table;
2144 int i;
2145
2146 hlist_for_each_entry(pol, entry,
2147 &xfrm_policy_inexact[dir], bydst)
2148 prune_one_bundle(pol, func, &gc_list);
2149
2150 table = xfrm_policy_bydst[dir].table;
2151 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
2152 hlist_for_each_entry(pol, entry, table + i, bydst)
2153 prune_one_bundle(pol, func, &gc_list);
2154 }
2155 }
2156 read_unlock_bh(&xfrm_policy_lock);
2157
2158 while (gc_list) {
2159 struct dst_entry *dst = gc_list;
2160 gc_list = dst->next;
2161 dst_free(dst);
2162 }
2163 }
2164
2165 static int unused_bundle(struct dst_entry *dst)
2166 {
2167 return !atomic_read(&dst->__refcnt);
2168 }
2169
2170 static void __xfrm_garbage_collect(void)
2171 {
2172 xfrm_prune_bundles(unused_bundle);
2173 }
2174
2175 static int xfrm_flush_bundles(void)
2176 {
2177 xfrm_prune_bundles(stale_bundle);
2178 return 0;
2179 }
2180
2181 static void xfrm_init_pmtu(struct dst_entry *dst)
2182 {
2183 do {
2184 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2185 u32 pmtu, route_mtu_cached;
2186
2187 pmtu = dst_mtu(dst->child);
2188 xdst->child_mtu_cached = pmtu;
2189
2190 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2191
2192 route_mtu_cached = dst_mtu(xdst->route);
2193 xdst->route_mtu_cached = route_mtu_cached;
2194
2195 if (pmtu > route_mtu_cached)
2196 pmtu = route_mtu_cached;
2197
2198 dst->metrics[RTAX_MTU-1] = pmtu;
2199 } while ((dst = dst->next));
2200 }
2201
2202 /* Check that the bundle accepts the flow and its components are
2203 * still valid.
2204 */
2205
2206 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2207 struct flowi *fl, int family, int strict)
2208 {
2209 struct dst_entry *dst = &first->u.dst;
2210 struct xfrm_dst *last;
2211 u32 mtu;
2212
2213 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2214 (dst->dev && !netif_running(dst->dev)))
2215 return 0;
2216 #ifdef CONFIG_XFRM_SUB_POLICY
2217 if (fl) {
2218 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2219 return 0;
2220 if (first->partner &&
2221 !xfrm_selector_match(first->partner, fl, family))
2222 return 0;
2223 }
2224 #endif
2225
2226 last = NULL;
2227
2228 do {
2229 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2230
2231 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2232 return 0;
2233 if (fl && pol &&
2234 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2235 return 0;
2236 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2237 return 0;
2238 if (xdst->genid != dst->xfrm->genid)
2239 return 0;
2240
2241 if (strict && fl &&
2242 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2243 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2244 return 0;
2245
2246 mtu = dst_mtu(dst->child);
2247 if (xdst->child_mtu_cached != mtu) {
2248 last = xdst;
2249 xdst->child_mtu_cached = mtu;
2250 }
2251
2252 if (!dst_check(xdst->route, xdst->route_cookie))
2253 return 0;
2254 mtu = dst_mtu(xdst->route);
2255 if (xdst->route_mtu_cached != mtu) {
2256 last = xdst;
2257 xdst->route_mtu_cached = mtu;
2258 }
2259
2260 dst = dst->child;
2261 } while (dst->xfrm);
2262
2263 if (likely(!last))
2264 return 1;
2265
2266 mtu = last->child_mtu_cached;
2267 for (;;) {
2268 dst = &last->u.dst;
2269
2270 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2271 if (mtu > last->route_mtu_cached)
2272 mtu = last->route_mtu_cached;
2273 dst->metrics[RTAX_MTU-1] = mtu;
2274
2275 if (last == first)
2276 break;
2277
2278 last = (struct xfrm_dst *)last->u.dst.next;
2279 last->child_mtu_cached = mtu;
2280 }
2281
2282 return 1;
2283 }
2284
2285 EXPORT_SYMBOL(xfrm_bundle_ok);
2286
2287 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2288 {
2289 int err = 0;
2290 if (unlikely(afinfo == NULL))
2291 return -EINVAL;
2292 if (unlikely(afinfo->family >= NPROTO))
2293 return -EAFNOSUPPORT;
2294 write_lock_bh(&xfrm_policy_afinfo_lock);
2295 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2296 err = -ENOBUFS;
2297 else {
2298 struct dst_ops *dst_ops = afinfo->dst_ops;
2299 if (likely(dst_ops->kmem_cachep == NULL))
2300 dst_ops->kmem_cachep = xfrm_dst_cache;
2301 if (likely(dst_ops->check == NULL))
2302 dst_ops->check = xfrm_dst_check;
2303 if (likely(dst_ops->negative_advice == NULL))
2304 dst_ops->negative_advice = xfrm_negative_advice;
2305 if (likely(dst_ops->link_failure == NULL))
2306 dst_ops->link_failure = xfrm_link_failure;
2307 if (likely(afinfo->garbage_collect == NULL))
2308 afinfo->garbage_collect = __xfrm_garbage_collect;
2309 xfrm_policy_afinfo[afinfo->family] = afinfo;
2310 }
2311 write_unlock_bh(&xfrm_policy_afinfo_lock);
2312 return err;
2313 }
2314 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2315
2316 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2317 {
2318 int err = 0;
2319 if (unlikely(afinfo == NULL))
2320 return -EINVAL;
2321 if (unlikely(afinfo->family >= NPROTO))
2322 return -EAFNOSUPPORT;
2323 write_lock_bh(&xfrm_policy_afinfo_lock);
2324 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2325 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2326 err = -EINVAL;
2327 else {
2328 struct dst_ops *dst_ops = afinfo->dst_ops;
2329 xfrm_policy_afinfo[afinfo->family] = NULL;
2330 dst_ops->kmem_cachep = NULL;
2331 dst_ops->check = NULL;
2332 dst_ops->negative_advice = NULL;
2333 dst_ops->link_failure = NULL;
2334 afinfo->garbage_collect = NULL;
2335 }
2336 }
2337 write_unlock_bh(&xfrm_policy_afinfo_lock);
2338 return err;
2339 }
2340 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2341
2342 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2343 {
2344 struct xfrm_policy_afinfo *afinfo;
2345 if (unlikely(family >= NPROTO))
2346 return NULL;
2347 read_lock(&xfrm_policy_afinfo_lock);
2348 afinfo = xfrm_policy_afinfo[family];
2349 if (unlikely(!afinfo))
2350 read_unlock(&xfrm_policy_afinfo_lock);
2351 return afinfo;
2352 }
2353
2354 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2355 {
2356 read_unlock(&xfrm_policy_afinfo_lock);
2357 }
2358
2359 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2360 {
2361 struct net_device *dev = ptr;
2362
2363 if (dev_net(dev) != &init_net)
2364 return NOTIFY_DONE;
2365
2366 switch (event) {
2367 case NETDEV_DOWN:
2368 xfrm_flush_bundles();
2369 }
2370 return NOTIFY_DONE;
2371 }
2372
2373 static struct notifier_block xfrm_dev_notifier = {
2374 xfrm_dev_event,
2375 NULL,
2376 0
2377 };
2378
2379 #ifdef CONFIG_XFRM_STATISTICS
2380 static int __init xfrm_statistics_init(void)
2381 {
2382 if (snmp_mib_init((void **)xfrm_statistics,
2383 sizeof(struct linux_xfrm_mib)) < 0)
2384 return -ENOMEM;
2385 return 0;
2386 }
2387 #endif
2388
2389 static void __init xfrm_policy_init(void)
2390 {
2391 unsigned int hmask, sz;
2392 int dir;
2393
2394 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2395 sizeof(struct xfrm_dst),
2396 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2397 NULL);
2398
2399 hmask = 8 - 1;
2400 sz = (hmask+1) * sizeof(struct hlist_head);
2401
2402 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2403 xfrm_idx_hmask = hmask;
2404 if (!xfrm_policy_byidx)
2405 panic("XFRM: failed to allocate byidx hash\n");
2406
2407 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2408 struct xfrm_policy_hash *htab;
2409
2410 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2411
2412 htab = &xfrm_policy_bydst[dir];
2413 htab->table = xfrm_hash_alloc(sz);
2414 htab->hmask = hmask;
2415 if (!htab->table)
2416 panic("XFRM: failed to allocate bydst hash\n");
2417 }
2418
2419 for (dir = 0; dir < XFRM_POLICY_TYPE_MAX; dir++)
2420 INIT_LIST_HEAD(&xfrm_policy_bytype[dir]);
2421
2422 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2423 register_netdevice_notifier(&xfrm_dev_notifier);
2424 }
2425
2426 void __init xfrm_init(void)
2427 {
2428 #ifdef CONFIG_XFRM_STATISTICS
2429 xfrm_statistics_init();
2430 #endif
2431 xfrm_state_init();
2432 xfrm_policy_init();
2433 xfrm_input_init();
2434 #ifdef CONFIG_XFRM_STATISTICS
2435 xfrm_proc_init();
2436 #endif
2437 }
2438
2439 #ifdef CONFIG_AUDITSYSCALL
2440 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2441 struct audit_buffer *audit_buf)
2442 {
2443 struct xfrm_sec_ctx *ctx = xp->security;
2444 struct xfrm_selector *sel = &xp->selector;
2445
2446 if (ctx)
2447 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2448 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2449
2450 switch(sel->family) {
2451 case AF_INET:
2452 audit_log_format(audit_buf, " src=" NIPQUAD_FMT,
2453 NIPQUAD(sel->saddr.a4));
2454 if (sel->prefixlen_s != 32)
2455 audit_log_format(audit_buf, " src_prefixlen=%d",
2456 sel->prefixlen_s);
2457 audit_log_format(audit_buf, " dst=" NIPQUAD_FMT,
2458 NIPQUAD(sel->daddr.a4));
2459 if (sel->prefixlen_d != 32)
2460 audit_log_format(audit_buf, " dst_prefixlen=%d",
2461 sel->prefixlen_d);
2462 break;
2463 case AF_INET6:
2464 audit_log_format(audit_buf, " src=" NIP6_FMT,
2465 NIP6(*(struct in6_addr *)sel->saddr.a6));
2466 if (sel->prefixlen_s != 128)
2467 audit_log_format(audit_buf, " src_prefixlen=%d",
2468 sel->prefixlen_s);
2469 audit_log_format(audit_buf, " dst=" NIP6_FMT,
2470 NIP6(*(struct in6_addr *)sel->daddr.a6));
2471 if (sel->prefixlen_d != 128)
2472 audit_log_format(audit_buf, " dst_prefixlen=%d",
2473 sel->prefixlen_d);
2474 break;
2475 }
2476 }
2477
2478 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2479 uid_t auid, u32 sessionid, u32 secid)
2480 {
2481 struct audit_buffer *audit_buf;
2482
2483 audit_buf = xfrm_audit_start("SPD-add");
2484 if (audit_buf == NULL)
2485 return;
2486 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2487 audit_log_format(audit_buf, " res=%u", result);
2488 xfrm_audit_common_policyinfo(xp, audit_buf);
2489 audit_log_end(audit_buf);
2490 }
2491 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2492
2493 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2494 uid_t auid, u32 sessionid, u32 secid)
2495 {
2496 struct audit_buffer *audit_buf;
2497
2498 audit_buf = xfrm_audit_start("SPD-delete");
2499 if (audit_buf == NULL)
2500 return;
2501 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2502 audit_log_format(audit_buf, " res=%u", result);
2503 xfrm_audit_common_policyinfo(xp, audit_buf);
2504 audit_log_end(audit_buf);
2505 }
2506 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2507 #endif
2508
2509 #ifdef CONFIG_XFRM_MIGRATE
2510 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2511 struct xfrm_selector *sel_tgt)
2512 {
2513 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2514 if (sel_tgt->family == sel_cmp->family &&
2515 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2516 sel_cmp->family) == 0 &&
2517 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2518 sel_cmp->family) == 0 &&
2519 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2520 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2521 return 1;
2522 }
2523 } else {
2524 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2525 return 1;
2526 }
2527 }
2528 return 0;
2529 }
2530
2531 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2532 u8 dir, u8 type)
2533 {
2534 struct xfrm_policy *pol, *ret = NULL;
2535 struct hlist_node *entry;
2536 struct hlist_head *chain;
2537 u32 priority = ~0U;
2538
2539 read_lock_bh(&xfrm_policy_lock);
2540 chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
2541 hlist_for_each_entry(pol, entry, chain, bydst) {
2542 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2543 pol->type == type) {
2544 ret = pol;
2545 priority = ret->priority;
2546 break;
2547 }
2548 }
2549 chain = &xfrm_policy_inexact[dir];
2550 hlist_for_each_entry(pol, entry, chain, bydst) {
2551 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2552 pol->type == type &&
2553 pol->priority < priority) {
2554 ret = pol;
2555 break;
2556 }
2557 }
2558
2559 if (ret)
2560 xfrm_pol_hold(ret);
2561
2562 read_unlock_bh(&xfrm_policy_lock);
2563
2564 return ret;
2565 }
2566
2567 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2568 {
2569 int match = 0;
2570
2571 if (t->mode == m->mode && t->id.proto == m->proto &&
2572 (m->reqid == 0 || t->reqid == m->reqid)) {
2573 switch (t->mode) {
2574 case XFRM_MODE_TUNNEL:
2575 case XFRM_MODE_BEET:
2576 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2577 m->old_family) == 0 &&
2578 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2579 m->old_family) == 0) {
2580 match = 1;
2581 }
2582 break;
2583 case XFRM_MODE_TRANSPORT:
2584 /* in case of transport mode, template does not store
2585 any IP addresses, hence we just compare mode and
2586 protocol */
2587 match = 1;
2588 break;
2589 default:
2590 break;
2591 }
2592 }
2593 return match;
2594 }
2595
2596 /* update endpoint address(es) of template(s) */
2597 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2598 struct xfrm_migrate *m, int num_migrate)
2599 {
2600 struct xfrm_migrate *mp;
2601 struct dst_entry *dst;
2602 int i, j, n = 0;
2603
2604 write_lock_bh(&pol->lock);
2605 if (unlikely(pol->dead)) {
2606 /* target policy has been deleted */
2607 write_unlock_bh(&pol->lock);
2608 return -ENOENT;
2609 }
2610
2611 for (i = 0; i < pol->xfrm_nr; i++) {
2612 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2613 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2614 continue;
2615 n++;
2616 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2617 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2618 continue;
2619 /* update endpoints */
2620 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2621 sizeof(pol->xfrm_vec[i].id.daddr));
2622 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2623 sizeof(pol->xfrm_vec[i].saddr));
2624 pol->xfrm_vec[i].encap_family = mp->new_family;
2625 /* flush bundles */
2626 while ((dst = pol->bundles) != NULL) {
2627 pol->bundles = dst->next;
2628 dst_free(dst);
2629 }
2630 }
2631 }
2632
2633 write_unlock_bh(&pol->lock);
2634
2635 if (!n)
2636 return -ENODATA;
2637
2638 return 0;
2639 }
2640
2641 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2642 {
2643 int i, j;
2644
2645 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2646 return -EINVAL;
2647
2648 for (i = 0; i < num_migrate; i++) {
2649 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2650 m[i].old_family) == 0) &&
2651 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2652 m[i].old_family) == 0))
2653 return -EINVAL;
2654 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2655 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2656 return -EINVAL;
2657
2658 /* check if there is any duplicated entry */
2659 for (j = i + 1; j < num_migrate; j++) {
2660 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2661 sizeof(m[i].old_daddr)) &&
2662 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2663 sizeof(m[i].old_saddr)) &&
2664 m[i].proto == m[j].proto &&
2665 m[i].mode == m[j].mode &&
2666 m[i].reqid == m[j].reqid &&
2667 m[i].old_family == m[j].old_family)
2668 return -EINVAL;
2669 }
2670 }
2671
2672 return 0;
2673 }
2674
2675 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2676 struct xfrm_migrate *m, int num_migrate)
2677 {
2678 int i, err, nx_cur = 0, nx_new = 0;
2679 struct xfrm_policy *pol = NULL;
2680 struct xfrm_state *x, *xc;
2681 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2682 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2683 struct xfrm_migrate *mp;
2684
2685 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2686 goto out;
2687
2688 /* Stage 1 - find policy */
2689 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2690 err = -ENOENT;
2691 goto out;
2692 }
2693
2694 /* Stage 2 - find and update state(s) */
2695 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2696 if ((x = xfrm_migrate_state_find(mp))) {
2697 x_cur[nx_cur] = x;
2698 nx_cur++;
2699 if ((xc = xfrm_state_migrate(x, mp))) {
2700 x_new[nx_new] = xc;
2701 nx_new++;
2702 } else {
2703 err = -ENODATA;
2704 goto restore_state;
2705 }
2706 }
2707 }
2708
2709 /* Stage 3 - update policy */
2710 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2711 goto restore_state;
2712
2713 /* Stage 4 - delete old state(s) */
2714 if (nx_cur) {
2715 xfrm_states_put(x_cur, nx_cur);
2716 xfrm_states_delete(x_cur, nx_cur);
2717 }
2718
2719 /* Stage 5 - announce */
2720 km_migrate(sel, dir, type, m, num_migrate);
2721
2722 xfrm_pol_put(pol);
2723
2724 return 0;
2725 out:
2726 return err;
2727
2728 restore_state:
2729 if (pol)
2730 xfrm_pol_put(pol);
2731 if (nx_cur)
2732 xfrm_states_put(x_cur, nx_cur);
2733 if (nx_new)
2734 xfrm_states_delete(x_new, nx_new);
2735
2736 return err;
2737 }
2738 EXPORT_SYMBOL(xfrm_migrate);
2739 #endif
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