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alpha: use generic ptrace_resume code
[linux-2.6/kvm.git] / net / xfrm / xfrm_policy.c
blob34a5ef8316e7e23378543f442ee0ac66a4fbf409
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 DEFINE_MUTEX(xfrm_cfg_mutex);
38 EXPORT_SYMBOL(xfrm_cfg_mutex);
39
40 static DEFINE_RWLOCK(xfrm_policy_lock);
41
42 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
43 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
44
45 static struct kmem_cache *xfrm_dst_cache __read_mostly;
46
47 static HLIST_HEAD(xfrm_policy_gc_list);
48 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
49
50 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
51 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
52 static void xfrm_init_pmtu(struct dst_entry *dst);
53
54 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
55 int dir);
56
57 static inline int
58 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
59 {
60 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
61 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
62 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
63 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
64 (fl->proto == sel->proto || !sel->proto) &&
65 (fl->oif == sel->ifindex || !sel->ifindex);
66 }
67
68 static inline int
69 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
70 {
71 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
72 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
73 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
74 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
75 (fl->proto == sel->proto || !sel->proto) &&
76 (fl->oif == sel->ifindex || !sel->ifindex);
77 }
78
79 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
80 unsigned short family)
81 {
82 switch (family) {
83 case AF_INET:
84 return __xfrm4_selector_match(sel, fl);
85 case AF_INET6:
86 return __xfrm6_selector_match(sel, fl);
87 }
88 return 0;
89 }
90
91 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
92 xfrm_address_t *saddr,
93 xfrm_address_t *daddr,
94 int family)
95 {
96 struct xfrm_policy_afinfo *afinfo;
97 struct dst_entry *dst;
98
99 afinfo = xfrm_policy_get_afinfo(family);
100 if (unlikely(afinfo == NULL))
101 return ERR_PTR(-EAFNOSUPPORT);
102
103 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
104
105 xfrm_policy_put_afinfo(afinfo);
106
107 return dst;
108 }
109
110 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
111 xfrm_address_t *prev_saddr,
112 xfrm_address_t *prev_daddr,
113 int family)
114 {
115 struct net *net = xs_net(x);
116 xfrm_address_t *saddr = &x->props.saddr;
117 xfrm_address_t *daddr = &x->id.daddr;
118 struct dst_entry *dst;
119
120 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
121 saddr = x->coaddr;
122 daddr = prev_daddr;
123 }
124 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
125 saddr = prev_saddr;
126 daddr = x->coaddr;
127 }
128
129 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
130
131 if (!IS_ERR(dst)) {
132 if (prev_saddr != saddr)
133 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
134 if (prev_daddr != daddr)
135 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
136 }
137
138 return dst;
139 }
140
141 static inline unsigned long make_jiffies(long secs)
142 {
143 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
144 return MAX_SCHEDULE_TIMEOUT-1;
145 else
146 return secs*HZ;
147 }
148
149 static void xfrm_policy_timer(unsigned long data)
150 {
151 struct xfrm_policy *xp = (struct xfrm_policy*)data;
152 unsigned long now = get_seconds();
153 long next = LONG_MAX;
154 int warn = 0;
155 int dir;
156
157 read_lock(&xp->lock);
158
159 if (xp->walk.dead)
160 goto out;
161
162 dir = xfrm_policy_id2dir(xp->index);
163
164 if (xp->lft.hard_add_expires_seconds) {
165 long tmo = xp->lft.hard_add_expires_seconds +
166 xp->curlft.add_time - now;
167 if (tmo <= 0)
168 goto expired;
169 if (tmo < next)
170 next = tmo;
171 }
172 if (xp->lft.hard_use_expires_seconds) {
173 long tmo = xp->lft.hard_use_expires_seconds +
174 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
175 if (tmo <= 0)
176 goto expired;
177 if (tmo < next)
178 next = tmo;
179 }
180 if (xp->lft.soft_add_expires_seconds) {
181 long tmo = xp->lft.soft_add_expires_seconds +
182 xp->curlft.add_time - now;
183 if (tmo <= 0) {
184 warn = 1;
185 tmo = XFRM_KM_TIMEOUT;
186 }
187 if (tmo < next)
188 next = tmo;
189 }
190 if (xp->lft.soft_use_expires_seconds) {
191 long tmo = xp->lft.soft_use_expires_seconds +
192 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
193 if (tmo <= 0) {
194 warn = 1;
195 tmo = XFRM_KM_TIMEOUT;
196 }
197 if (tmo < next)
198 next = tmo;
199 }
200
201 if (warn)
202 km_policy_expired(xp, dir, 0, 0);
203 if (next != LONG_MAX &&
204 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
205 xfrm_pol_hold(xp);
206
207 out:
208 read_unlock(&xp->lock);
209 xfrm_pol_put(xp);
210 return;
211
212 expired:
213 read_unlock(&xp->lock);
214 if (!xfrm_policy_delete(xp, dir))
215 km_policy_expired(xp, dir, 1, 0);
216 xfrm_pol_put(xp);
217 }
218
219
220 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
221 * SPD calls.
222 */
223
224 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
225 {
226 struct xfrm_policy *policy;
227
228 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
229
230 if (policy) {
231 write_pnet(&policy->xp_net, net);
232 INIT_LIST_HEAD(&policy->walk.all);
233 INIT_HLIST_NODE(&policy->bydst);
234 INIT_HLIST_NODE(&policy->byidx);
235 rwlock_init(&policy->lock);
236 atomic_set(&policy->refcnt, 1);
237 setup_timer(&policy->timer, xfrm_policy_timer,
238 (unsigned long)policy);
239 }
240 return policy;
241 }
242 EXPORT_SYMBOL(xfrm_policy_alloc);
243
244 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
245
246 void xfrm_policy_destroy(struct xfrm_policy *policy)
247 {
248 BUG_ON(!policy->walk.dead);
249
250 BUG_ON(policy->bundles);
251
252 if (del_timer(&policy->timer))
253 BUG();
254
255 security_xfrm_policy_free(policy->security);
256 kfree(policy);
257 }
258 EXPORT_SYMBOL(xfrm_policy_destroy);
259
260 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
261 {
262 struct dst_entry *dst;
263
264 while ((dst = policy->bundles) != NULL) {
265 policy->bundles = dst->next;
266 dst_free(dst);
267 }
268
269 if (del_timer(&policy->timer))
270 atomic_dec(&policy->refcnt);
271
272 if (atomic_read(&policy->refcnt) > 1)
273 flow_cache_flush();
274
275 xfrm_pol_put(policy);
276 }
277
278 static void xfrm_policy_gc_task(struct work_struct *work)
279 {
280 struct xfrm_policy *policy;
281 struct hlist_node *entry, *tmp;
282 struct hlist_head gc_list;
283
284 spin_lock_bh(&xfrm_policy_gc_lock);
285 gc_list.first = xfrm_policy_gc_list.first;
286 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
287 spin_unlock_bh(&xfrm_policy_gc_lock);
288
289 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
290 xfrm_policy_gc_kill(policy);
291 }
292 static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task);
293
294 /* Rule must be locked. Release descentant resources, announce
295 * entry dead. The rule must be unlinked from lists to the moment.
296 */
297
298 static void xfrm_policy_kill(struct xfrm_policy *policy)
299 {
300 int dead;
301
302 write_lock_bh(&policy->lock);
303 dead = policy->walk.dead;
304 policy->walk.dead = 1;
305 write_unlock_bh(&policy->lock);
306
307 if (unlikely(dead)) {
308 WARN_ON(1);
309 return;
310 }
311
312 spin_lock_bh(&xfrm_policy_gc_lock);
313 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
314 spin_unlock_bh(&xfrm_policy_gc_lock);
315
316 schedule_work(&xfrm_policy_gc_work);
317 }
318
319 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
320
321 static inline unsigned int idx_hash(struct net *net, u32 index)
322 {
323 return __idx_hash(index, net->xfrm.policy_idx_hmask);
324 }
325
326 static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
327 {
328 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
329 unsigned int hash = __sel_hash(sel, family, hmask);
330
331 return (hash == hmask + 1 ?
332 &net->xfrm.policy_inexact[dir] :
333 net->xfrm.policy_bydst[dir].table + hash);
334 }
335
336 static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
337 {
338 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
339 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
340
341 return net->xfrm.policy_bydst[dir].table + hash;
342 }
343
344 static void xfrm_dst_hash_transfer(struct hlist_head *list,
345 struct hlist_head *ndsttable,
346 unsigned int nhashmask)
347 {
348 struct hlist_node *entry, *tmp, *entry0 = NULL;
349 struct xfrm_policy *pol;
350 unsigned int h0 = 0;
351
352 redo:
353 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
354 unsigned int h;
355
356 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
357 pol->family, nhashmask);
358 if (!entry0) {
359 hlist_del(entry);
360 hlist_add_head(&pol->bydst, ndsttable+h);
361 h0 = h;
362 } else {
363 if (h != h0)
364 continue;
365 hlist_del(entry);
366 hlist_add_after(entry0, &pol->bydst);
367 }
368 entry0 = entry;
369 }
370 if (!hlist_empty(list)) {
371 entry0 = NULL;
372 goto redo;
373 }
374 }
375
376 static void xfrm_idx_hash_transfer(struct hlist_head *list,
377 struct hlist_head *nidxtable,
378 unsigned int nhashmask)
379 {
380 struct hlist_node *entry, *tmp;
381 struct xfrm_policy *pol;
382
383 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
384 unsigned int h;
385
386 h = __idx_hash(pol->index, nhashmask);
387 hlist_add_head(&pol->byidx, nidxtable+h);
388 }
389 }
390
391 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
392 {
393 return ((old_hmask + 1) << 1) - 1;
394 }
395
396 static void xfrm_bydst_resize(struct net *net, int dir)
397 {
398 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
399 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
400 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
401 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
402 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
403 int i;
404
405 if (!ndst)
406 return;
407
408 write_lock_bh(&xfrm_policy_lock);
409
410 for (i = hmask; i >= 0; i--)
411 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
412
413 net->xfrm.policy_bydst[dir].table = ndst;
414 net->xfrm.policy_bydst[dir].hmask = nhashmask;
415
416 write_unlock_bh(&xfrm_policy_lock);
417
418 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
419 }
420
421 static void xfrm_byidx_resize(struct net *net, int total)
422 {
423 unsigned int hmask = net->xfrm.policy_idx_hmask;
424 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
425 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
426 struct hlist_head *oidx = net->xfrm.policy_byidx;
427 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
428 int i;
429
430 if (!nidx)
431 return;
432
433 write_lock_bh(&xfrm_policy_lock);
434
435 for (i = hmask; i >= 0; i--)
436 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
437
438 net->xfrm.policy_byidx = nidx;
439 net->xfrm.policy_idx_hmask = nhashmask;
440
441 write_unlock_bh(&xfrm_policy_lock);
442
443 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
444 }
445
446 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
447 {
448 unsigned int cnt = net->xfrm.policy_count[dir];
449 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
450
451 if (total)
452 *total += cnt;
453
454 if ((hmask + 1) < xfrm_policy_hashmax &&
455 cnt > hmask)
456 return 1;
457
458 return 0;
459 }
460
461 static inline int xfrm_byidx_should_resize(struct net *net, int total)
462 {
463 unsigned int hmask = net->xfrm.policy_idx_hmask;
464
465 if ((hmask + 1) < xfrm_policy_hashmax &&
466 total > hmask)
467 return 1;
468
469 return 0;
470 }
471
472 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
473 {
474 read_lock_bh(&xfrm_policy_lock);
475 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
476 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
477 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
478 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
479 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
480 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
481 si->spdhcnt = net->xfrm.policy_idx_hmask;
482 si->spdhmcnt = xfrm_policy_hashmax;
483 read_unlock_bh(&xfrm_policy_lock);
484 }
485 EXPORT_SYMBOL(xfrm_spd_getinfo);
486
487 static DEFINE_MUTEX(hash_resize_mutex);
488 static void xfrm_hash_resize(struct work_struct *work)
489 {
490 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
491 int dir, total;
492
493 mutex_lock(&hash_resize_mutex);
494
495 total = 0;
496 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
497 if (xfrm_bydst_should_resize(net, dir, &total))
498 xfrm_bydst_resize(net, dir);
499 }
500 if (xfrm_byidx_should_resize(net, total))
501 xfrm_byidx_resize(net, total);
502
503 mutex_unlock(&hash_resize_mutex);
504 }
505
506 /* Generate new index... KAME seems to generate them ordered by cost
507 * of an absolute inpredictability of ordering of rules. This will not pass. */
508 static u32 xfrm_gen_index(struct net *net, int dir)
509 {
510 static u32 idx_generator;
511
512 for (;;) {
513 struct hlist_node *entry;
514 struct hlist_head *list;
515 struct xfrm_policy *p;
516 u32 idx;
517 int found;
518
519 idx = (idx_generator | dir);
520 idx_generator += 8;
521 if (idx == 0)
522 idx = 8;
523 list = net->xfrm.policy_byidx + idx_hash(net, idx);
524 found = 0;
525 hlist_for_each_entry(p, entry, list, byidx) {
526 if (p->index == idx) {
527 found = 1;
528 break;
529 }
530 }
531 if (!found)
532 return idx;
533 }
534 }
535
536 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
537 {
538 u32 *p1 = (u32 *) s1;
539 u32 *p2 = (u32 *) s2;
540 int len = sizeof(struct xfrm_selector) / sizeof(u32);
541 int i;
542
543 for (i = 0; i < len; i++) {
544 if (p1[i] != p2[i])
545 return 1;
546 }
547
548 return 0;
549 }
550
551 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
552 {
553 struct net *net = xp_net(policy);
554 struct xfrm_policy *pol;
555 struct xfrm_policy *delpol;
556 struct hlist_head *chain;
557 struct hlist_node *entry, *newpos;
558 struct dst_entry *gc_list;
559 u32 mark = policy->mark.v & policy->mark.m;
560
561 write_lock_bh(&xfrm_policy_lock);
562 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
563 delpol = NULL;
564 newpos = NULL;
565 hlist_for_each_entry(pol, entry, chain, bydst) {
566 if (pol->type == policy->type &&
567 !selector_cmp(&pol->selector, &policy->selector) &&
568 (mark & pol->mark.m) == pol->mark.v &&
569 xfrm_sec_ctx_match(pol->security, policy->security) &&
570 !WARN_ON(delpol)) {
571 if (excl) {
572 write_unlock_bh(&xfrm_policy_lock);
573 return -EEXIST;
574 }
575 delpol = pol;
576 if (policy->priority > pol->priority)
577 continue;
578 } else if (policy->priority >= pol->priority) {
579 newpos = &pol->bydst;
580 continue;
581 }
582 if (delpol)
583 break;
584 }
585 if (newpos)
586 hlist_add_after(newpos, &policy->bydst);
587 else
588 hlist_add_head(&policy->bydst, chain);
589 xfrm_pol_hold(policy);
590 net->xfrm.policy_count[dir]++;
591 atomic_inc(&flow_cache_genid);
592 if (delpol)
593 __xfrm_policy_unlink(delpol, dir);
594 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
595 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
596 policy->curlft.add_time = get_seconds();
597 policy->curlft.use_time = 0;
598 if (!mod_timer(&policy->timer, jiffies + HZ))
599 xfrm_pol_hold(policy);
600 list_add(&policy->walk.all, &net->xfrm.policy_all);
601 write_unlock_bh(&xfrm_policy_lock);
602
603 if (delpol)
604 xfrm_policy_kill(delpol);
605 else if (xfrm_bydst_should_resize(net, dir, NULL))
606 schedule_work(&net->xfrm.policy_hash_work);
607
608 read_lock_bh(&xfrm_policy_lock);
609 gc_list = NULL;
610 entry = &policy->bydst;
611 hlist_for_each_entry_continue(policy, entry, bydst) {
612 struct dst_entry *dst;
613
614 write_lock(&policy->lock);
615 dst = policy->bundles;
616 if (dst) {
617 struct dst_entry *tail = dst;
618 while (tail->next)
619 tail = tail->next;
620 tail->next = gc_list;
621 gc_list = dst;
622
623 policy->bundles = NULL;
624 }
625 write_unlock(&policy->lock);
626 }
627 read_unlock_bh(&xfrm_policy_lock);
628
629 while (gc_list) {
630 struct dst_entry *dst = gc_list;
631
632 gc_list = dst->next;
633 dst_free(dst);
634 }
635
636 return 0;
637 }
638 EXPORT_SYMBOL(xfrm_policy_insert);
639
640 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
641 int dir, struct xfrm_selector *sel,
642 struct xfrm_sec_ctx *ctx, int delete,
643 int *err)
644 {
645 struct xfrm_policy *pol, *ret;
646 struct hlist_head *chain;
647 struct hlist_node *entry;
648
649 *err = 0;
650 write_lock_bh(&xfrm_policy_lock);
651 chain = policy_hash_bysel(net, sel, sel->family, dir);
652 ret = NULL;
653 hlist_for_each_entry(pol, entry, chain, bydst) {
654 if (pol->type == type &&
655 (mark & pol->mark.m) == pol->mark.v &&
656 !selector_cmp(sel, &pol->selector) &&
657 xfrm_sec_ctx_match(ctx, pol->security)) {
658 xfrm_pol_hold(pol);
659 if (delete) {
660 *err = security_xfrm_policy_delete(
661 pol->security);
662 if (*err) {
663 write_unlock_bh(&xfrm_policy_lock);
664 return pol;
665 }
666 __xfrm_policy_unlink(pol, dir);
667 }
668 ret = pol;
669 break;
670 }
671 }
672 write_unlock_bh(&xfrm_policy_lock);
673
674 if (ret && delete) {
675 atomic_inc(&flow_cache_genid);
676 xfrm_policy_kill(ret);
677 }
678 return ret;
679 }
680 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
681
682 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
683 int dir, u32 id, int delete, int *err)
684 {
685 struct xfrm_policy *pol, *ret;
686 struct hlist_head *chain;
687 struct hlist_node *entry;
688
689 *err = -ENOENT;
690 if (xfrm_policy_id2dir(id) != dir)
691 return NULL;
692
693 *err = 0;
694 write_lock_bh(&xfrm_policy_lock);
695 chain = net->xfrm.policy_byidx + idx_hash(net, id);
696 ret = NULL;
697 hlist_for_each_entry(pol, entry, chain, byidx) {
698 if (pol->type == type && pol->index == id &&
699 (mark & pol->mark.m) == pol->mark.v) {
700 xfrm_pol_hold(pol);
701 if (delete) {
702 *err = security_xfrm_policy_delete(
703 pol->security);
704 if (*err) {
705 write_unlock_bh(&xfrm_policy_lock);
706 return pol;
707 }
708 __xfrm_policy_unlink(pol, dir);
709 }
710 ret = pol;
711 break;
712 }
713 }
714 write_unlock_bh(&xfrm_policy_lock);
715
716 if (ret && delete) {
717 atomic_inc(&flow_cache_genid);
718 xfrm_policy_kill(ret);
719 }
720 return ret;
721 }
722 EXPORT_SYMBOL(xfrm_policy_byid);
723
724 #ifdef CONFIG_SECURITY_NETWORK_XFRM
725 static inline int
726 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
727 {
728 int dir, err = 0;
729
730 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
731 struct xfrm_policy *pol;
732 struct hlist_node *entry;
733 int i;
734
735 hlist_for_each_entry(pol, entry,
736 &net->xfrm.policy_inexact[dir], bydst) {
737 if (pol->type != type)
738 continue;
739 err = security_xfrm_policy_delete(pol->security);
740 if (err) {
741 xfrm_audit_policy_delete(pol, 0,
742 audit_info->loginuid,
743 audit_info->sessionid,
744 audit_info->secid);
745 return err;
746 }
747 }
748 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
749 hlist_for_each_entry(pol, entry,
750 net->xfrm.policy_bydst[dir].table + i,
751 bydst) {
752 if (pol->type != type)
753 continue;
754 err = security_xfrm_policy_delete(
755 pol->security);
756 if (err) {
757 xfrm_audit_policy_delete(pol, 0,
758 audit_info->loginuid,
759 audit_info->sessionid,
760 audit_info->secid);
761 return err;
762 }
763 }
764 }
765 }
766 return err;
767 }
768 #else
769 static inline int
770 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
771 {
772 return 0;
773 }
774 #endif
775
776 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
777 {
778 int dir, err = 0, cnt = 0;
779 struct xfrm_policy *dp;
780
781 write_lock_bh(&xfrm_policy_lock);
782
783 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
784 if (err)
785 goto out;
786
787 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
788 struct xfrm_policy *pol;
789 struct hlist_node *entry;
790 int i;
791
792 again1:
793 hlist_for_each_entry(pol, entry,
794 &net->xfrm.policy_inexact[dir], bydst) {
795 if (pol->type != type)
796 continue;
797 dp = __xfrm_policy_unlink(pol, dir);
798 write_unlock_bh(&xfrm_policy_lock);
799 if (dp)
800 cnt++;
801
802 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
803 audit_info->sessionid,
804 audit_info->secid);
805
806 xfrm_policy_kill(pol);
807
808 write_lock_bh(&xfrm_policy_lock);
809 goto again1;
810 }
811
812 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
813 again2:
814 hlist_for_each_entry(pol, entry,
815 net->xfrm.policy_bydst[dir].table + i,
816 bydst) {
817 if (pol->type != type)
818 continue;
819 dp = __xfrm_policy_unlink(pol, dir);
820 write_unlock_bh(&xfrm_policy_lock);
821 if (dp)
822 cnt++;
823
824 xfrm_audit_policy_delete(pol, 1,
825 audit_info->loginuid,
826 audit_info->sessionid,
827 audit_info->secid);
828 xfrm_policy_kill(pol);
829
830 write_lock_bh(&xfrm_policy_lock);
831 goto again2;
832 }
833 }
834
835 }
836 if (!cnt)
837 err = -ESRCH;
838 atomic_inc(&flow_cache_genid);
839 out:
840 write_unlock_bh(&xfrm_policy_lock);
841 return err;
842 }
843 EXPORT_SYMBOL(xfrm_policy_flush);
844
845 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
846 int (*func)(struct xfrm_policy *, int, int, void*),
847 void *data)
848 {
849 struct xfrm_policy *pol;
850 struct xfrm_policy_walk_entry *x;
851 int error = 0;
852
853 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
854 walk->type != XFRM_POLICY_TYPE_ANY)
855 return -EINVAL;
856
857 if (list_empty(&walk->walk.all) && walk->seq != 0)
858 return 0;
859
860 write_lock_bh(&xfrm_policy_lock);
861 if (list_empty(&walk->walk.all))
862 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
863 else
864 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
865 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
866 if (x->dead)
867 continue;
868 pol = container_of(x, struct xfrm_policy, walk);
869 if (walk->type != XFRM_POLICY_TYPE_ANY &&
870 walk->type != pol->type)
871 continue;
872 error = func(pol, xfrm_policy_id2dir(pol->index),
873 walk->seq, data);
874 if (error) {
875 list_move_tail(&walk->walk.all, &x->all);
876 goto out;
877 }
878 walk->seq++;
879 }
880 if (walk->seq == 0) {
881 error = -ENOENT;
882 goto out;
883 }
884 list_del_init(&walk->walk.all);
885 out:
886 write_unlock_bh(&xfrm_policy_lock);
887 return error;
888 }
889 EXPORT_SYMBOL(xfrm_policy_walk);
890
891 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
892 {
893 INIT_LIST_HEAD(&walk->walk.all);
894 walk->walk.dead = 1;
895 walk->type = type;
896 walk->seq = 0;
897 }
898 EXPORT_SYMBOL(xfrm_policy_walk_init);
899
900 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
901 {
902 if (list_empty(&walk->walk.all))
903 return;
904
905 write_lock_bh(&xfrm_policy_lock);
906 list_del(&walk->walk.all);
907 write_unlock_bh(&xfrm_policy_lock);
908 }
909 EXPORT_SYMBOL(xfrm_policy_walk_done);
910
911 /*
912 * Find policy to apply to this flow.
913 *
914 * Returns 0 if policy found, else an -errno.
915 */
916 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
917 u8 type, u16 family, int dir)
918 {
919 struct xfrm_selector *sel = &pol->selector;
920 int match, ret = -ESRCH;
921
922 if (pol->family != family ||
923 (fl->mark & pol->mark.m) != pol->mark.v ||
924 pol->type != type)
925 return ret;
926
927 match = xfrm_selector_match(sel, fl, family);
928 if (match)
929 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
930 dir);
931
932 return ret;
933 }
934
935 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
936 struct flowi *fl,
937 u16 family, u8 dir)
938 {
939 int err;
940 struct xfrm_policy *pol, *ret;
941 xfrm_address_t *daddr, *saddr;
942 struct hlist_node *entry;
943 struct hlist_head *chain;
944 u32 priority = ~0U;
945
946 daddr = xfrm_flowi_daddr(fl, family);
947 saddr = xfrm_flowi_saddr(fl, family);
948 if (unlikely(!daddr || !saddr))
949 return NULL;
950
951 read_lock_bh(&xfrm_policy_lock);
952 chain = policy_hash_direct(net, daddr, saddr, family, dir);
953 ret = NULL;
954 hlist_for_each_entry(pol, entry, chain, bydst) {
955 err = xfrm_policy_match(pol, fl, type, family, dir);
956 if (err) {
957 if (err == -ESRCH)
958 continue;
959 else {
960 ret = ERR_PTR(err);
961 goto fail;
962 }
963 } else {
964 ret = pol;
965 priority = ret->priority;
966 break;
967 }
968 }
969 chain = &net->xfrm.policy_inexact[dir];
970 hlist_for_each_entry(pol, entry, chain, bydst) {
971 err = xfrm_policy_match(pol, fl, type, family, dir);
972 if (err) {
973 if (err == -ESRCH)
974 continue;
975 else {
976 ret = ERR_PTR(err);
977 goto fail;
978 }
979 } else if (pol->priority < priority) {
980 ret = pol;
981 break;
982 }
983 }
984 if (ret)
985 xfrm_pol_hold(ret);
986 fail:
987 read_unlock_bh(&xfrm_policy_lock);
988
989 return ret;
990 }
991
992 static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
993 u8 dir, void **objp, atomic_t **obj_refp)
994 {
995 struct xfrm_policy *pol;
996 int err = 0;
997
998 #ifdef CONFIG_XFRM_SUB_POLICY
999 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1000 if (IS_ERR(pol)) {
1001 err = PTR_ERR(pol);
1002 pol = NULL;
1003 }
1004 if (pol || err)
1005 goto end;
1006 #endif
1007 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1008 if (IS_ERR(pol)) {
1009 err = PTR_ERR(pol);
1010 pol = NULL;
1011 }
1012 #ifdef CONFIG_XFRM_SUB_POLICY
1013 end:
1014 #endif
1015 if ((*objp = (void *) pol) != NULL)
1016 *obj_refp = &pol->refcnt;
1017 return err;
1018 }
1019
1020 static inline int policy_to_flow_dir(int dir)
1021 {
1022 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1023 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1024 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1025 return dir;
1026 switch (dir) {
1027 default:
1028 case XFRM_POLICY_IN:
1029 return FLOW_DIR_IN;
1030 case XFRM_POLICY_OUT:
1031 return FLOW_DIR_OUT;
1032 case XFRM_POLICY_FWD:
1033 return FLOW_DIR_FWD;
1034 }
1035 }
1036
1037 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1038 {
1039 struct xfrm_policy *pol;
1040
1041 read_lock_bh(&xfrm_policy_lock);
1042 if ((pol = sk->sk_policy[dir]) != NULL) {
1043 int match = xfrm_selector_match(&pol->selector, fl,
1044 sk->sk_family);
1045 int err = 0;
1046
1047 if (match) {
1048 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1049 pol = NULL;
1050 goto out;
1051 }
1052 err = security_xfrm_policy_lookup(pol->security,
1053 fl->secid,
1054 policy_to_flow_dir(dir));
1055 if (!err)
1056 xfrm_pol_hold(pol);
1057 else if (err == -ESRCH)
1058 pol = NULL;
1059 else
1060 pol = ERR_PTR(err);
1061 } else
1062 pol = NULL;
1063 }
1064 out:
1065 read_unlock_bh(&xfrm_policy_lock);
1066 return pol;
1067 }
1068
1069 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1070 {
1071 struct net *net = xp_net(pol);
1072 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1073 pol->family, dir);
1074
1075 list_add(&pol->walk.all, &net->xfrm.policy_all);
1076 hlist_add_head(&pol->bydst, chain);
1077 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1078 net->xfrm.policy_count[dir]++;
1079 xfrm_pol_hold(pol);
1080
1081 if (xfrm_bydst_should_resize(net, dir, NULL))
1082 schedule_work(&net->xfrm.policy_hash_work);
1083 }
1084
1085 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1086 int dir)
1087 {
1088 struct net *net = xp_net(pol);
1089
1090 if (hlist_unhashed(&pol->bydst))
1091 return NULL;
1092
1093 hlist_del(&pol->bydst);
1094 hlist_del(&pol->byidx);
1095 list_del(&pol->walk.all);
1096 net->xfrm.policy_count[dir]--;
1097
1098 return pol;
1099 }
1100
1101 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1102 {
1103 write_lock_bh(&xfrm_policy_lock);
1104 pol = __xfrm_policy_unlink(pol, dir);
1105 write_unlock_bh(&xfrm_policy_lock);
1106 if (pol) {
1107 if (dir < XFRM_POLICY_MAX)
1108 atomic_inc(&flow_cache_genid);
1109 xfrm_policy_kill(pol);
1110 return 0;
1111 }
1112 return -ENOENT;
1113 }
1114 EXPORT_SYMBOL(xfrm_policy_delete);
1115
1116 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1117 {
1118 struct net *net = xp_net(pol);
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(net, 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(xp_net(old), 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->mark = old->mark;
1158 newp->action = old->action;
1159 newp->flags = old->flags;
1160 newp->xfrm_nr = old->xfrm_nr;
1161 newp->index = old->index;
1162 newp->type = old->type;
1163 memcpy(newp->xfrm_vec, old->xfrm_vec,
1164 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1165 write_lock_bh(&xfrm_policy_lock);
1166 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1167 write_unlock_bh(&xfrm_policy_lock);
1168 xfrm_pol_put(newp);
1169 }
1170 return newp;
1171 }
1172
1173 int __xfrm_sk_clone_policy(struct sock *sk)
1174 {
1175 struct xfrm_policy *p0 = sk->sk_policy[0],
1176 *p1 = sk->sk_policy[1];
1177
1178 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1179 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1180 return -ENOMEM;
1181 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1182 return -ENOMEM;
1183 return 0;
1184 }
1185
1186 static int
1187 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1188 unsigned short family)
1189 {
1190 int err;
1191 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1192
1193 if (unlikely(afinfo == NULL))
1194 return -EINVAL;
1195 err = afinfo->get_saddr(net, local, remote);
1196 xfrm_policy_put_afinfo(afinfo);
1197 return err;
1198 }
1199
1200 /* Resolve list of templates for the flow, given policy. */
1201
1202 static int
1203 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1204 struct xfrm_state **xfrm,
1205 unsigned short family)
1206 {
1207 struct net *net = xp_net(policy);
1208 int nx;
1209 int i, error;
1210 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1211 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1212 xfrm_address_t tmp;
1213
1214 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1215 struct xfrm_state *x;
1216 xfrm_address_t *remote = daddr;
1217 xfrm_address_t *local = saddr;
1218 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1219
1220 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1221 tmpl->mode == XFRM_MODE_BEET) {
1222 remote = &tmpl->id.daddr;
1223 local = &tmpl->saddr;
1224 family = tmpl->encap_family;
1225 if (xfrm_addr_any(local, family)) {
1226 error = xfrm_get_saddr(net, &tmp, remote, family);
1227 if (error)
1228 goto fail;
1229 local = &tmp;
1230 }
1231 }
1232
1233 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1234
1235 if (x && x->km.state == XFRM_STATE_VALID) {
1236 xfrm[nx++] = x;
1237 daddr = remote;
1238 saddr = local;
1239 continue;
1240 }
1241 if (x) {
1242 error = (x->km.state == XFRM_STATE_ERROR ?
1243 -EINVAL : -EAGAIN);
1244 xfrm_state_put(x);
1245 }
1246 else if (error == -ESRCH)
1247 error = -EAGAIN;
1248
1249 if (!tmpl->optional)
1250 goto fail;
1251 }
1252 return nx;
1253
1254 fail:
1255 for (nx--; nx>=0; nx--)
1256 xfrm_state_put(xfrm[nx]);
1257 return error;
1258 }
1259
1260 static int
1261 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1262 struct xfrm_state **xfrm,
1263 unsigned short family)
1264 {
1265 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1266 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1267 int cnx = 0;
1268 int error;
1269 int ret;
1270 int i;
1271
1272 for (i = 0; i < npols; i++) {
1273 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1274 error = -ENOBUFS;
1275 goto fail;
1276 }
1277
1278 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1279 if (ret < 0) {
1280 error = ret;
1281 goto fail;
1282 } else
1283 cnx += ret;
1284 }
1285
1286 /* found states are sorted for outbound processing */
1287 if (npols > 1)
1288 xfrm_state_sort(xfrm, tpp, cnx, family);
1289
1290 return cnx;
1291
1292 fail:
1293 for (cnx--; cnx>=0; cnx--)
1294 xfrm_state_put(tpp[cnx]);
1295 return error;
1296
1297 }
1298
1299 /* Check that the bundle accepts the flow and its components are
1300 * still valid.
1301 */
1302
1303 static struct dst_entry *
1304 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1305 {
1306 struct dst_entry *x;
1307 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1308 if (unlikely(afinfo == NULL))
1309 return ERR_PTR(-EINVAL);
1310 x = afinfo->find_bundle(fl, policy);
1311 xfrm_policy_put_afinfo(afinfo);
1312 return x;
1313 }
1314
1315 static inline int xfrm_get_tos(struct flowi *fl, int family)
1316 {
1317 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1318 int tos;
1319
1320 if (!afinfo)
1321 return -EINVAL;
1322
1323 tos = afinfo->get_tos(fl);
1324
1325 xfrm_policy_put_afinfo(afinfo);
1326
1327 return tos;
1328 }
1329
1330 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1331 {
1332 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1333 struct dst_ops *dst_ops;
1334 struct xfrm_dst *xdst;
1335
1336 if (!afinfo)
1337 return ERR_PTR(-EINVAL);
1338
1339 switch (family) {
1340 case AF_INET:
1341 dst_ops = &net->xfrm.xfrm4_dst_ops;
1342 break;
1343 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1344 case AF_INET6:
1345 dst_ops = &net->xfrm.xfrm6_dst_ops;
1346 break;
1347 #endif
1348 default:
1349 BUG();
1350 }
1351 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
1352
1353 xfrm_policy_put_afinfo(afinfo);
1354
1355 return xdst;
1356 }
1357
1358 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1359 int nfheader_len)
1360 {
1361 struct xfrm_policy_afinfo *afinfo =
1362 xfrm_policy_get_afinfo(dst->ops->family);
1363 int err;
1364
1365 if (!afinfo)
1366 return -EINVAL;
1367
1368 err = afinfo->init_path(path, dst, nfheader_len);
1369
1370 xfrm_policy_put_afinfo(afinfo);
1371
1372 return err;
1373 }
1374
1375 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
1376 {
1377 struct xfrm_policy_afinfo *afinfo =
1378 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1379 int err;
1380
1381 if (!afinfo)
1382 return -EINVAL;
1383
1384 err = afinfo->fill_dst(xdst, dev);
1385
1386 xfrm_policy_put_afinfo(afinfo);
1387
1388 return err;
1389 }
1390
1391 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1392 * all the metrics... Shortly, bundle a bundle.
1393 */
1394
1395 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1396 struct xfrm_state **xfrm, int nx,
1397 struct flowi *fl,
1398 struct dst_entry *dst)
1399 {
1400 struct net *net = xp_net(policy);
1401 unsigned long now = jiffies;
1402 struct net_device *dev;
1403 struct dst_entry *dst_prev = NULL;
1404 struct dst_entry *dst0 = NULL;
1405 int i = 0;
1406 int err;
1407 int header_len = 0;
1408 int nfheader_len = 0;
1409 int trailer_len = 0;
1410 int tos;
1411 int family = policy->selector.family;
1412 xfrm_address_t saddr, daddr;
1413
1414 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1415
1416 tos = xfrm_get_tos(fl, family);
1417 err = tos;
1418 if (tos < 0)
1419 goto put_states;
1420
1421 dst_hold(dst);
1422
1423 for (; i < nx; i++) {
1424 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1425 struct dst_entry *dst1 = &xdst->u.dst;
1426
1427 err = PTR_ERR(xdst);
1428 if (IS_ERR(xdst)) {
1429 dst_release(dst);
1430 goto put_states;
1431 }
1432
1433 if (!dst_prev)
1434 dst0 = dst1;
1435 else {
1436 dst_prev->child = dst_clone(dst1);
1437 dst1->flags |= DST_NOHASH;
1438 }
1439
1440 xdst->route = dst;
1441 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1442
1443 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1444 family = xfrm[i]->props.family;
1445 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1446 family);
1447 err = PTR_ERR(dst);
1448 if (IS_ERR(dst))
1449 goto put_states;
1450 } else
1451 dst_hold(dst);
1452
1453 dst1->xfrm = xfrm[i];
1454 xdst->genid = xfrm[i]->genid;
1455
1456 dst1->obsolete = -1;
1457 dst1->flags |= DST_HOST;
1458 dst1->lastuse = now;
1459
1460 dst1->input = dst_discard;
1461 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1462
1463 dst1->next = dst_prev;
1464 dst_prev = dst1;
1465
1466 header_len += xfrm[i]->props.header_len;
1467 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1468 nfheader_len += xfrm[i]->props.header_len;
1469 trailer_len += xfrm[i]->props.trailer_len;
1470 }
1471
1472 dst_prev->child = dst;
1473 dst0->path = dst;
1474
1475 err = -ENODEV;
1476 dev = dst->dev;
1477 if (!dev)
1478 goto free_dst;
1479
1480 /* Copy neighbour for reachability confirmation */
1481 dst0->neighbour = neigh_clone(dst->neighbour);
1482
1483 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1484 xfrm_init_pmtu(dst_prev);
1485
1486 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1487 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1488
1489 err = xfrm_fill_dst(xdst, dev);
1490 if (err)
1491 goto free_dst;
1492
1493 dst_prev->header_len = header_len;
1494 dst_prev->trailer_len = trailer_len;
1495 header_len -= xdst->u.dst.xfrm->props.header_len;
1496 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1497 }
1498
1499 out:
1500 return dst0;
1501
1502 put_states:
1503 for (; i < nx; i++)
1504 xfrm_state_put(xfrm[i]);
1505 free_dst:
1506 if (dst0)
1507 dst_free(dst0);
1508 dst0 = ERR_PTR(err);
1509 goto out;
1510 }
1511
1512 static int inline
1513 xfrm_dst_alloc_copy(void **target, void *src, int size)
1514 {
1515 if (!*target) {
1516 *target = kmalloc(size, GFP_ATOMIC);
1517 if (!*target)
1518 return -ENOMEM;
1519 }
1520 memcpy(*target, src, size);
1521 return 0;
1522 }
1523
1524 static int inline
1525 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1526 {
1527 #ifdef CONFIG_XFRM_SUB_POLICY
1528 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1529 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1530 sel, sizeof(*sel));
1531 #else
1532 return 0;
1533 #endif
1534 }
1535
1536 static int inline
1537 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1538 {
1539 #ifdef CONFIG_XFRM_SUB_POLICY
1540 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1541 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1542 #else
1543 return 0;
1544 #endif
1545 }
1546
1547 static int stale_bundle(struct dst_entry *dst);
1548
1549 /* Main function: finds/creates a bundle for given flow.
1550 *
1551 * At the moment we eat a raw IP route. Mostly to speed up lookups
1552 * on interfaces with disabled IPsec.
1553 */
1554 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1555 struct sock *sk, int flags)
1556 {
1557 struct xfrm_policy *policy;
1558 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1559 int npols;
1560 int pol_dead;
1561 int xfrm_nr;
1562 int pi;
1563 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1564 struct dst_entry *dst, *dst_orig = *dst_p;
1565 int nx = 0;
1566 int err;
1567 u32 genid;
1568 u16 family;
1569 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1570
1571 restart:
1572 genid = atomic_read(&flow_cache_genid);
1573 policy = NULL;
1574 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1575 pols[pi] = NULL;
1576 npols = 0;
1577 pol_dead = 0;
1578 xfrm_nr = 0;
1579
1580 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1581 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1582 err = PTR_ERR(policy);
1583 if (IS_ERR(policy)) {
1584 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1585 goto dropdst;
1586 }
1587 }
1588
1589 if (!policy) {
1590 /* To accelerate a bit... */
1591 if ((dst_orig->flags & DST_NOXFRM) ||
1592 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1593 goto nopol;
1594
1595 policy = flow_cache_lookup(net, fl, dst_orig->ops->family,
1596 dir, xfrm_policy_lookup);
1597 err = PTR_ERR(policy);
1598 if (IS_ERR(policy)) {
1599 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1600 goto dropdst;
1601 }
1602 }
1603
1604 if (!policy)
1605 goto nopol;
1606
1607 family = dst_orig->ops->family;
1608 pols[0] = policy;
1609 npols ++;
1610 xfrm_nr += pols[0]->xfrm_nr;
1611
1612 err = -ENOENT;
1613 if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
1614 goto error;
1615
1616 policy->curlft.use_time = get_seconds();
1617
1618 switch (policy->action) {
1619 default:
1620 case XFRM_POLICY_BLOCK:
1621 /* Prohibit the flow */
1622 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1623 err = -EPERM;
1624 goto error;
1625
1626 case XFRM_POLICY_ALLOW:
1627 #ifndef CONFIG_XFRM_SUB_POLICY
1628 if (policy->xfrm_nr == 0) {
1629 /* Flow passes not transformed. */
1630 xfrm_pol_put(policy);
1631 return 0;
1632 }
1633 #endif
1634
1635 /* Try to find matching bundle.
1636 *
1637 * LATER: help from flow cache. It is optional, this
1638 * is required only for output policy.
1639 */
1640 dst = xfrm_find_bundle(fl, policy, family);
1641 if (IS_ERR(dst)) {
1642 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1643 err = PTR_ERR(dst);
1644 goto error;
1645 }
1646
1647 if (dst)
1648 break;
1649
1650 #ifdef CONFIG_XFRM_SUB_POLICY
1651 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1652 pols[1] = xfrm_policy_lookup_bytype(net,
1653 XFRM_POLICY_TYPE_MAIN,
1654 fl, family,
1655 XFRM_POLICY_OUT);
1656 if (pols[1]) {
1657 if (IS_ERR(pols[1])) {
1658 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1659 err = PTR_ERR(pols[1]);
1660 goto error;
1661 }
1662 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1663 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1664 err = -EPERM;
1665 goto error;
1666 }
1667 npols ++;
1668 xfrm_nr += pols[1]->xfrm_nr;
1669 }
1670 }
1671
1672 /*
1673 * Because neither flowi nor bundle information knows about
1674 * transformation template size. On more than one policy usage
1675 * we can realize whether all of them is bypass or not after
1676 * they are searched. See above not-transformed bypass
1677 * is surrounded by non-sub policy configuration, too.
1678 */
1679 if (xfrm_nr == 0) {
1680 /* Flow passes not transformed. */
1681 xfrm_pols_put(pols, npols);
1682 return 0;
1683 }
1684
1685 #endif
1686 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1687
1688 if (unlikely(nx<0)) {
1689 err = nx;
1690 if (err == -EAGAIN && net->xfrm.sysctl_larval_drop) {
1691 /* EREMOTE tells the caller to generate
1692 * a one-shot blackhole route.
1693 */
1694 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1695 xfrm_pol_put(policy);
1696 return -EREMOTE;
1697 }
1698 if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
1699 DECLARE_WAITQUEUE(wait, current);
1700
1701 add_wait_queue(&net->xfrm.km_waitq, &wait);
1702 set_current_state(TASK_INTERRUPTIBLE);
1703 schedule();
1704 set_current_state(TASK_RUNNING);
1705 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1706
1707 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1708
1709 if (nx == -EAGAIN && signal_pending(current)) {
1710 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1711 err = -ERESTART;
1712 goto error;
1713 }
1714 if (nx == -EAGAIN ||
1715 genid != atomic_read(&flow_cache_genid)) {
1716 xfrm_pols_put(pols, npols);
1717 goto restart;
1718 }
1719 err = nx;
1720 }
1721 if (err < 0) {
1722 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1723 goto error;
1724 }
1725 }
1726 if (nx == 0) {
1727 /* Flow passes not transformed. */
1728 xfrm_pols_put(pols, npols);
1729 return 0;
1730 }
1731
1732 dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
1733 err = PTR_ERR(dst);
1734 if (IS_ERR(dst)) {
1735 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1736 goto error;
1737 }
1738
1739 for (pi = 0; pi < npols; pi++) {
1740 read_lock_bh(&pols[pi]->lock);
1741 pol_dead |= pols[pi]->walk.dead;
1742 read_unlock_bh(&pols[pi]->lock);
1743 }
1744
1745 write_lock_bh(&policy->lock);
1746 if (unlikely(pol_dead || stale_bundle(dst))) {
1747 /* Wow! While we worked on resolving, this
1748 * policy has gone. Retry. It is not paranoia,
1749 * we just cannot enlist new bundle to dead object.
1750 * We can't enlist stable bundles either.
1751 */
1752 write_unlock_bh(&policy->lock);
1753 dst_free(dst);
1754
1755 if (pol_dead)
1756 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLDEAD);
1757 else
1758 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1759 err = -EHOSTUNREACH;
1760 goto error;
1761 }
1762
1763 if (npols > 1)
1764 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1765 else
1766 err = xfrm_dst_update_origin(dst, fl);
1767 if (unlikely(err)) {
1768 write_unlock_bh(&policy->lock);
1769 dst_free(dst);
1770 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1771 goto error;
1772 }
1773
1774 dst->next = policy->bundles;
1775 policy->bundles = dst;
1776 dst_hold(dst);
1777 write_unlock_bh(&policy->lock);
1778 }
1779 *dst_p = dst;
1780 dst_release(dst_orig);
1781 xfrm_pols_put(pols, npols);
1782 return 0;
1783
1784 error:
1785 xfrm_pols_put(pols, npols);
1786 dropdst:
1787 dst_release(dst_orig);
1788 *dst_p = NULL;
1789 return err;
1790
1791 nopol:
1792 err = -ENOENT;
1793 if (flags & XFRM_LOOKUP_ICMP)
1794 goto dropdst;
1795 return 0;
1796 }
1797 EXPORT_SYMBOL(__xfrm_lookup);
1798
1799 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1800 struct sock *sk, int flags)
1801 {
1802 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1803
1804 if (err == -EREMOTE) {
1805 dst_release(*dst_p);
1806 *dst_p = NULL;
1807 err = -EAGAIN;
1808 }
1809
1810 return err;
1811 }
1812 EXPORT_SYMBOL(xfrm_lookup);
1813
1814 static inline int
1815 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1816 {
1817 struct xfrm_state *x;
1818
1819 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1820 return 0;
1821 x = skb->sp->xvec[idx];
1822 if (!x->type->reject)
1823 return 0;
1824 return x->type->reject(x, skb, fl);
1825 }
1826
1827 /* When skb is transformed back to its "native" form, we have to
1828 * check policy restrictions. At the moment we make this in maximally
1829 * stupid way. Shame on me. :-) Of course, connected sockets must
1830 * have policy cached at them.
1831 */
1832
1833 static inline int
1834 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1835 unsigned short family)
1836 {
1837 if (xfrm_state_kern(x))
1838 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1839 return x->id.proto == tmpl->id.proto &&
1840 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1841 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1842 x->props.mode == tmpl->mode &&
1843 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1844 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1845 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1846 xfrm_state_addr_cmp(tmpl, x, family));
1847 }
1848
1849 /*
1850 * 0 or more than 0 is returned when validation is succeeded (either bypass
1851 * because of optional transport mode, or next index of the mathced secpath
1852 * state with the template.
1853 * -1 is returned when no matching template is found.
1854 * Otherwise "-2 - errored_index" is returned.
1855 */
1856 static inline int
1857 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1858 unsigned short family)
1859 {
1860 int idx = start;
1861
1862 if (tmpl->optional) {
1863 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1864 return start;
1865 } else
1866 start = -1;
1867 for (; idx < sp->len; idx++) {
1868 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1869 return ++idx;
1870 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1871 if (start == -1)
1872 start = -2-idx;
1873 break;
1874 }
1875 }
1876 return start;
1877 }
1878
1879 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1880 unsigned int family, int reverse)
1881 {
1882 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1883 int err;
1884
1885 if (unlikely(afinfo == NULL))
1886 return -EAFNOSUPPORT;
1887
1888 afinfo->decode_session(skb, fl, reverse);
1889 err = security_xfrm_decode_session(skb, &fl->secid);
1890 xfrm_policy_put_afinfo(afinfo);
1891 return err;
1892 }
1893 EXPORT_SYMBOL(__xfrm_decode_session);
1894
1895 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1896 {
1897 for (; k < sp->len; k++) {
1898 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1899 *idxp = k;
1900 return 1;
1901 }
1902 }
1903
1904 return 0;
1905 }
1906
1907 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1908 unsigned short family)
1909 {
1910 struct net *net = dev_net(skb->dev);
1911 struct xfrm_policy *pol;
1912 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1913 int npols = 0;
1914 int xfrm_nr;
1915 int pi;
1916 int reverse;
1917 struct flowi fl;
1918 u8 fl_dir;
1919 int xerr_idx = -1;
1920
1921 reverse = dir & ~XFRM_POLICY_MASK;
1922 dir &= XFRM_POLICY_MASK;
1923 fl_dir = policy_to_flow_dir(dir);
1924
1925 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
1926 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1927 return 0;
1928 }
1929
1930 nf_nat_decode_session(skb, &fl, family);
1931
1932 /* First, check used SA against their selectors. */
1933 if (skb->sp) {
1934 int i;
1935
1936 for (i=skb->sp->len-1; i>=0; i--) {
1937 struct xfrm_state *x = skb->sp->xvec[i];
1938 if (!xfrm_selector_match(&x->sel, &fl, family)) {
1939 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1940 return 0;
1941 }
1942 }
1943 }
1944
1945 pol = NULL;
1946 if (sk && sk->sk_policy[dir]) {
1947 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1948 if (IS_ERR(pol)) {
1949 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
1950 return 0;
1951 }
1952 }
1953
1954 if (!pol)
1955 pol = flow_cache_lookup(net, &fl, family, fl_dir,
1956 xfrm_policy_lookup);
1957
1958 if (IS_ERR(pol)) {
1959 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
1960 return 0;
1961 }
1962
1963 if (!pol) {
1964 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1965 xfrm_secpath_reject(xerr_idx, skb, &fl);
1966 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
1967 return 0;
1968 }
1969 return 1;
1970 }
1971
1972 pol->curlft.use_time = get_seconds();
1973
1974 pols[0] = pol;
1975 npols ++;
1976 #ifdef CONFIG_XFRM_SUB_POLICY
1977 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1978 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
1979 &fl, family,
1980 XFRM_POLICY_IN);
1981 if (pols[1]) {
1982 if (IS_ERR(pols[1])) {
1983 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
1984 return 0;
1985 }
1986 pols[1]->curlft.use_time = get_seconds();
1987 npols ++;
1988 }
1989 }
1990 #endif
1991
1992 if (pol->action == XFRM_POLICY_ALLOW) {
1993 struct sec_path *sp;
1994 static struct sec_path dummy;
1995 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1996 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1997 struct xfrm_tmpl **tpp = tp;
1998 int ti = 0;
1999 int i, k;
2000
2001 if ((sp = skb->sp) == NULL)
2002 sp = &dummy;
2003
2004 for (pi = 0; pi < npols; pi++) {
2005 if (pols[pi] != pol &&
2006 pols[pi]->action != XFRM_POLICY_ALLOW) {
2007 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2008 goto reject;
2009 }
2010 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2011 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2012 goto reject_error;
2013 }
2014 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2015 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2016 }
2017 xfrm_nr = ti;
2018 if (npols > 1) {
2019 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2020 tpp = stp;
2021 }
2022
2023 /* For each tunnel xfrm, find the first matching tmpl.
2024 * For each tmpl before that, find corresponding xfrm.
2025 * Order is _important_. Later we will implement
2026 * some barriers, but at the moment barriers
2027 * are implied between each two transformations.
2028 */
2029 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2030 k = xfrm_policy_ok(tpp[i], sp, k, family);
2031 if (k < 0) {
2032 if (k < -1)
2033 /* "-2 - errored_index" returned */
2034 xerr_idx = -(2+k);
2035 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2036 goto reject;
2037 }
2038 }
2039
2040 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2041 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2042 goto reject;
2043 }
2044
2045 xfrm_pols_put(pols, npols);
2046 return 1;
2047 }
2048 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2049
2050 reject:
2051 xfrm_secpath_reject(xerr_idx, skb, &fl);
2052 reject_error:
2053 xfrm_pols_put(pols, npols);
2054 return 0;
2055 }
2056 EXPORT_SYMBOL(__xfrm_policy_check);
2057
2058 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2059 {
2060 struct net *net = dev_net(skb->dev);
2061 struct flowi fl;
2062 struct dst_entry *dst;
2063 int res;
2064
2065 if (xfrm_decode_session(skb, &fl, family) < 0) {
2066 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2067 return 0;
2068 }
2069
2070 dst = skb_dst(skb);
2071
2072 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2073 skb_dst_set(skb, dst);
2074 return res;
2075 }
2076 EXPORT_SYMBOL(__xfrm_route_forward);
2077
2078 /* Optimize later using cookies and generation ids. */
2079
2080 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2081 {
2082 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2083 * to "-1" to force all XFRM destinations to get validated by
2084 * dst_ops->check on every use. We do this because when a
2085 * normal route referenced by an XFRM dst is obsoleted we do
2086 * not go looking around for all parent referencing XFRM dsts
2087 * so that we can invalidate them. It is just too much work.
2088 * Instead we make the checks here on every use. For example:
2089 *
2090 * XFRM dst A --> IPv4 dst X
2091 *
2092 * X is the "xdst->route" of A (X is also the "dst->path" of A
2093 * in this example). If X is marked obsolete, "A" will not
2094 * notice. That's what we are validating here via the
2095 * stale_bundle() check.
2096 *
2097 * When a policy's bundle is pruned, we dst_free() the XFRM
2098 * dst which causes it's ->obsolete field to be set to a
2099 * positive non-zero integer. If an XFRM dst has been pruned
2100 * like this, we want to force a new route lookup.
2101 */
2102 if (dst->obsolete < 0 && !stale_bundle(dst))
2103 return dst;
2104
2105 return NULL;
2106 }
2107
2108 static int stale_bundle(struct dst_entry *dst)
2109 {
2110 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2111 }
2112
2113 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2114 {
2115 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2116 dst->dev = dev_net(dev)->loopback_dev;
2117 dev_hold(dst->dev);
2118 dev_put(dev);
2119 }
2120 }
2121 EXPORT_SYMBOL(xfrm_dst_ifdown);
2122
2123 static void xfrm_link_failure(struct sk_buff *skb)
2124 {
2125 /* Impossible. Such dst must be popped before reaches point of failure. */
2126 return;
2127 }
2128
2129 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2130 {
2131 if (dst) {
2132 if (dst->obsolete) {
2133 dst_release(dst);
2134 dst = NULL;
2135 }
2136 }
2137 return dst;
2138 }
2139
2140 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
2141 {
2142 struct dst_entry *dst, **dstp;
2143
2144 write_lock(&pol->lock);
2145 dstp = &pol->bundles;
2146 while ((dst=*dstp) != NULL) {
2147 if (func(dst)) {
2148 *dstp = dst->next;
2149 dst->next = *gc_list_p;
2150 *gc_list_p = dst;
2151 } else {
2152 dstp = &dst->next;
2153 }
2154 }
2155 write_unlock(&pol->lock);
2156 }
2157
2158 static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *))
2159 {
2160 struct dst_entry *gc_list = NULL;
2161 int dir;
2162
2163 read_lock_bh(&xfrm_policy_lock);
2164 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2165 struct xfrm_policy *pol;
2166 struct hlist_node *entry;
2167 struct hlist_head *table;
2168 int i;
2169
2170 hlist_for_each_entry(pol, entry,
2171 &net->xfrm.policy_inexact[dir], bydst)
2172 prune_one_bundle(pol, func, &gc_list);
2173
2174 table = net->xfrm.policy_bydst[dir].table;
2175 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2176 hlist_for_each_entry(pol, entry, table + i, bydst)
2177 prune_one_bundle(pol, func, &gc_list);
2178 }
2179 }
2180 read_unlock_bh(&xfrm_policy_lock);
2181
2182 while (gc_list) {
2183 struct dst_entry *dst = gc_list;
2184 gc_list = dst->next;
2185 dst_free(dst);
2186 }
2187 }
2188
2189 static int unused_bundle(struct dst_entry *dst)
2190 {
2191 return !atomic_read(&dst->__refcnt);
2192 }
2193
2194 static void __xfrm_garbage_collect(struct net *net)
2195 {
2196 xfrm_prune_bundles(net, unused_bundle);
2197 }
2198
2199 static int xfrm_flush_bundles(struct net *net)
2200 {
2201 xfrm_prune_bundles(net, stale_bundle);
2202 return 0;
2203 }
2204
2205 static void xfrm_init_pmtu(struct dst_entry *dst)
2206 {
2207 do {
2208 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2209 u32 pmtu, route_mtu_cached;
2210
2211 pmtu = dst_mtu(dst->child);
2212 xdst->child_mtu_cached = pmtu;
2213
2214 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2215
2216 route_mtu_cached = dst_mtu(xdst->route);
2217 xdst->route_mtu_cached = route_mtu_cached;
2218
2219 if (pmtu > route_mtu_cached)
2220 pmtu = route_mtu_cached;
2221
2222 dst->metrics[RTAX_MTU-1] = pmtu;
2223 } while ((dst = dst->next));
2224 }
2225
2226 /* Check that the bundle accepts the flow and its components are
2227 * still valid.
2228 */
2229
2230 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2231 struct flowi *fl, int family, int strict)
2232 {
2233 struct dst_entry *dst = &first->u.dst;
2234 struct xfrm_dst *last;
2235 u32 mtu;
2236
2237 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2238 (dst->dev && !netif_running(dst->dev)))
2239 return 0;
2240 #ifdef CONFIG_XFRM_SUB_POLICY
2241 if (fl) {
2242 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2243 return 0;
2244 if (first->partner &&
2245 !xfrm_selector_match(first->partner, fl, family))
2246 return 0;
2247 }
2248 #endif
2249
2250 last = NULL;
2251
2252 do {
2253 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2254
2255 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2256 return 0;
2257 if (fl && pol &&
2258 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2259 return 0;
2260 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2261 return 0;
2262 if (xdst->genid != dst->xfrm->genid)
2263 return 0;
2264
2265 if (strict && fl &&
2266 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2267 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2268 return 0;
2269
2270 mtu = dst_mtu(dst->child);
2271 if (xdst->child_mtu_cached != mtu) {
2272 last = xdst;
2273 xdst->child_mtu_cached = mtu;
2274 }
2275
2276 if (!dst_check(xdst->route, xdst->route_cookie))
2277 return 0;
2278 mtu = dst_mtu(xdst->route);
2279 if (xdst->route_mtu_cached != mtu) {
2280 last = xdst;
2281 xdst->route_mtu_cached = mtu;
2282 }
2283
2284 dst = dst->child;
2285 } while (dst->xfrm);
2286
2287 if (likely(!last))
2288 return 1;
2289
2290 mtu = last->child_mtu_cached;
2291 for (;;) {
2292 dst = &last->u.dst;
2293
2294 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2295 if (mtu > last->route_mtu_cached)
2296 mtu = last->route_mtu_cached;
2297 dst->metrics[RTAX_MTU-1] = mtu;
2298
2299 if (last == first)
2300 break;
2301
2302 last = (struct xfrm_dst *)last->u.dst.next;
2303 last->child_mtu_cached = mtu;
2304 }
2305
2306 return 1;
2307 }
2308
2309 EXPORT_SYMBOL(xfrm_bundle_ok);
2310
2311 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2312 {
2313 struct net *net;
2314 int err = 0;
2315 if (unlikely(afinfo == NULL))
2316 return -EINVAL;
2317 if (unlikely(afinfo->family >= NPROTO))
2318 return -EAFNOSUPPORT;
2319 write_lock_bh(&xfrm_policy_afinfo_lock);
2320 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2321 err = -ENOBUFS;
2322 else {
2323 struct dst_ops *dst_ops = afinfo->dst_ops;
2324 if (likely(dst_ops->kmem_cachep == NULL))
2325 dst_ops->kmem_cachep = xfrm_dst_cache;
2326 if (likely(dst_ops->check == NULL))
2327 dst_ops->check = xfrm_dst_check;
2328 if (likely(dst_ops->negative_advice == NULL))
2329 dst_ops->negative_advice = xfrm_negative_advice;
2330 if (likely(dst_ops->link_failure == NULL))
2331 dst_ops->link_failure = xfrm_link_failure;
2332 if (likely(afinfo->garbage_collect == NULL))
2333 afinfo->garbage_collect = __xfrm_garbage_collect;
2334 xfrm_policy_afinfo[afinfo->family] = afinfo;
2335 }
2336 write_unlock_bh(&xfrm_policy_afinfo_lock);
2337
2338 rtnl_lock();
2339 for_each_net(net) {
2340 struct dst_ops *xfrm_dst_ops;
2341
2342 switch (afinfo->family) {
2343 case AF_INET:
2344 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2345 break;
2346 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2347 case AF_INET6:
2348 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2349 break;
2350 #endif
2351 default:
2352 BUG();
2353 }
2354 *xfrm_dst_ops = *afinfo->dst_ops;
2355 }
2356 rtnl_unlock();
2357
2358 return err;
2359 }
2360 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2361
2362 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2363 {
2364 int err = 0;
2365 if (unlikely(afinfo == NULL))
2366 return -EINVAL;
2367 if (unlikely(afinfo->family >= NPROTO))
2368 return -EAFNOSUPPORT;
2369 write_lock_bh(&xfrm_policy_afinfo_lock);
2370 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2371 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2372 err = -EINVAL;
2373 else {
2374 struct dst_ops *dst_ops = afinfo->dst_ops;
2375 xfrm_policy_afinfo[afinfo->family] = NULL;
2376 dst_ops->kmem_cachep = NULL;
2377 dst_ops->check = NULL;
2378 dst_ops->negative_advice = NULL;
2379 dst_ops->link_failure = NULL;
2380 afinfo->garbage_collect = NULL;
2381 }
2382 }
2383 write_unlock_bh(&xfrm_policy_afinfo_lock);
2384 return err;
2385 }
2386 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2387
2388 static void __net_init xfrm_dst_ops_init(struct net *net)
2389 {
2390 struct xfrm_policy_afinfo *afinfo;
2391
2392 read_lock_bh(&xfrm_policy_afinfo_lock);
2393 afinfo = xfrm_policy_afinfo[AF_INET];
2394 if (afinfo)
2395 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2396 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2397 afinfo = xfrm_policy_afinfo[AF_INET6];
2398 if (afinfo)
2399 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2400 #endif
2401 read_unlock_bh(&xfrm_policy_afinfo_lock);
2402 }
2403
2404 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2405 {
2406 struct xfrm_policy_afinfo *afinfo;
2407 if (unlikely(family >= NPROTO))
2408 return NULL;
2409 read_lock(&xfrm_policy_afinfo_lock);
2410 afinfo = xfrm_policy_afinfo[family];
2411 if (unlikely(!afinfo))
2412 read_unlock(&xfrm_policy_afinfo_lock);
2413 return afinfo;
2414 }
2415
2416 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2417 {
2418 read_unlock(&xfrm_policy_afinfo_lock);
2419 }
2420
2421 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2422 {
2423 struct net_device *dev = ptr;
2424
2425 switch (event) {
2426 case NETDEV_DOWN:
2427 xfrm_flush_bundles(dev_net(dev));
2428 }
2429 return NOTIFY_DONE;
2430 }
2431
2432 static struct notifier_block xfrm_dev_notifier = {
2433 .notifier_call = xfrm_dev_event,
2434 };
2435
2436 #ifdef CONFIG_XFRM_STATISTICS
2437 static int __net_init xfrm_statistics_init(struct net *net)
2438 {
2439 int rv;
2440
2441 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2442 sizeof(struct linux_xfrm_mib)) < 0)
2443 return -ENOMEM;
2444 rv = xfrm_proc_init(net);
2445 if (rv < 0)
2446 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2447 return rv;
2448 }
2449
2450 static void xfrm_statistics_fini(struct net *net)
2451 {
2452 xfrm_proc_fini(net);
2453 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2454 }
2455 #else
2456 static int __net_init xfrm_statistics_init(struct net *net)
2457 {
2458 return 0;
2459 }
2460
2461 static void xfrm_statistics_fini(struct net *net)
2462 {
2463 }
2464 #endif
2465
2466 static int __net_init xfrm_policy_init(struct net *net)
2467 {
2468 unsigned int hmask, sz;
2469 int dir;
2470
2471 if (net_eq(net, &init_net))
2472 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2473 sizeof(struct xfrm_dst),
2474 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2475 NULL);
2476
2477 hmask = 8 - 1;
2478 sz = (hmask+1) * sizeof(struct hlist_head);
2479
2480 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2481 if (!net->xfrm.policy_byidx)
2482 goto out_byidx;
2483 net->xfrm.policy_idx_hmask = hmask;
2484
2485 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2486 struct xfrm_policy_hash *htab;
2487
2488 net->xfrm.policy_count[dir] = 0;
2489 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2490
2491 htab = &net->xfrm.policy_bydst[dir];
2492 htab->table = xfrm_hash_alloc(sz);
2493 if (!htab->table)
2494 goto out_bydst;
2495 htab->hmask = hmask;
2496 }
2497
2498 INIT_LIST_HEAD(&net->xfrm.policy_all);
2499 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2500 if (net_eq(net, &init_net))
2501 register_netdevice_notifier(&xfrm_dev_notifier);
2502 return 0;
2503
2504 out_bydst:
2505 for (dir--; dir >= 0; dir--) {
2506 struct xfrm_policy_hash *htab;
2507
2508 htab = &net->xfrm.policy_bydst[dir];
2509 xfrm_hash_free(htab->table, sz);
2510 }
2511 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2512 out_byidx:
2513 return -ENOMEM;
2514 }
2515
2516 static void xfrm_policy_fini(struct net *net)
2517 {
2518 struct xfrm_audit audit_info;
2519 unsigned int sz;
2520 int dir;
2521
2522 flush_work(&net->xfrm.policy_hash_work);
2523 #ifdef CONFIG_XFRM_SUB_POLICY
2524 audit_info.loginuid = -1;
2525 audit_info.sessionid = -1;
2526 audit_info.secid = 0;
2527 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2528 #endif
2529 audit_info.loginuid = -1;
2530 audit_info.sessionid = -1;
2531 audit_info.secid = 0;
2532 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2533 flush_work(&xfrm_policy_gc_work);
2534
2535 WARN_ON(!list_empty(&net->xfrm.policy_all));
2536
2537 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2538 struct xfrm_policy_hash *htab;
2539
2540 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2541
2542 htab = &net->xfrm.policy_bydst[dir];
2543 sz = (htab->hmask + 1);
2544 WARN_ON(!hlist_empty(htab->table));
2545 xfrm_hash_free(htab->table, sz);
2546 }
2547
2548 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2549 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2550 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2551 }
2552
2553 static int __net_init xfrm_net_init(struct net *net)
2554 {
2555 int rv;
2556
2557 rv = xfrm_statistics_init(net);
2558 if (rv < 0)
2559 goto out_statistics;
2560 rv = xfrm_state_init(net);
2561 if (rv < 0)
2562 goto out_state;
2563 rv = xfrm_policy_init(net);
2564 if (rv < 0)
2565 goto out_policy;
2566 xfrm_dst_ops_init(net);
2567 rv = xfrm_sysctl_init(net);
2568 if (rv < 0)
2569 goto out_sysctl;
2570 return 0;
2571
2572 out_sysctl:
2573 xfrm_policy_fini(net);
2574 out_policy:
2575 xfrm_state_fini(net);
2576 out_state:
2577 xfrm_statistics_fini(net);
2578 out_statistics:
2579 return rv;
2580 }
2581
2582 static void __net_exit xfrm_net_exit(struct net *net)
2583 {
2584 xfrm_sysctl_fini(net);
2585 xfrm_policy_fini(net);
2586 xfrm_state_fini(net);
2587 xfrm_statistics_fini(net);
2588 }
2589
2590 static struct pernet_operations __net_initdata xfrm_net_ops = {
2591 .init = xfrm_net_init,
2592 .exit = xfrm_net_exit,
2593 };
2594
2595 void __init xfrm_init(void)
2596 {
2597 register_pernet_subsys(&xfrm_net_ops);
2598 xfrm_input_init();
2599 }
2600
2601 #ifdef CONFIG_AUDITSYSCALL
2602 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2603 struct audit_buffer *audit_buf)
2604 {
2605 struct xfrm_sec_ctx *ctx = xp->security;
2606 struct xfrm_selector *sel = &xp->selector;
2607
2608 if (ctx)
2609 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2610 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2611
2612 switch(sel->family) {
2613 case AF_INET:
2614 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2615 if (sel->prefixlen_s != 32)
2616 audit_log_format(audit_buf, " src_prefixlen=%d",
2617 sel->prefixlen_s);
2618 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2619 if (sel->prefixlen_d != 32)
2620 audit_log_format(audit_buf, " dst_prefixlen=%d",
2621 sel->prefixlen_d);
2622 break;
2623 case AF_INET6:
2624 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2625 if (sel->prefixlen_s != 128)
2626 audit_log_format(audit_buf, " src_prefixlen=%d",
2627 sel->prefixlen_s);
2628 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2629 if (sel->prefixlen_d != 128)
2630 audit_log_format(audit_buf, " dst_prefixlen=%d",
2631 sel->prefixlen_d);
2632 break;
2633 }
2634 }
2635
2636 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2637 uid_t auid, u32 sessionid, u32 secid)
2638 {
2639 struct audit_buffer *audit_buf;
2640
2641 audit_buf = xfrm_audit_start("SPD-add");
2642 if (audit_buf == NULL)
2643 return;
2644 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2645 audit_log_format(audit_buf, " res=%u", result);
2646 xfrm_audit_common_policyinfo(xp, audit_buf);
2647 audit_log_end(audit_buf);
2648 }
2649 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2650
2651 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2652 uid_t auid, u32 sessionid, u32 secid)
2653 {
2654 struct audit_buffer *audit_buf;
2655
2656 audit_buf = xfrm_audit_start("SPD-delete");
2657 if (audit_buf == NULL)
2658 return;
2659 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2660 audit_log_format(audit_buf, " res=%u", result);
2661 xfrm_audit_common_policyinfo(xp, audit_buf);
2662 audit_log_end(audit_buf);
2663 }
2664 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2665 #endif
2666
2667 #ifdef CONFIG_XFRM_MIGRATE
2668 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2669 struct xfrm_selector *sel_tgt)
2670 {
2671 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2672 if (sel_tgt->family == sel_cmp->family &&
2673 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2674 sel_cmp->family) == 0 &&
2675 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2676 sel_cmp->family) == 0 &&
2677 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2678 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2679 return 1;
2680 }
2681 } else {
2682 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2683 return 1;
2684 }
2685 }
2686 return 0;
2687 }
2688
2689 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2690 u8 dir, u8 type)
2691 {
2692 struct xfrm_policy *pol, *ret = NULL;
2693 struct hlist_node *entry;
2694 struct hlist_head *chain;
2695 u32 priority = ~0U;
2696
2697 read_lock_bh(&xfrm_policy_lock);
2698 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2699 hlist_for_each_entry(pol, entry, chain, bydst) {
2700 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2701 pol->type == type) {
2702 ret = pol;
2703 priority = ret->priority;
2704 break;
2705 }
2706 }
2707 chain = &init_net.xfrm.policy_inexact[dir];
2708 hlist_for_each_entry(pol, entry, chain, bydst) {
2709 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2710 pol->type == type &&
2711 pol->priority < priority) {
2712 ret = pol;
2713 break;
2714 }
2715 }
2716
2717 if (ret)
2718 xfrm_pol_hold(ret);
2719
2720 read_unlock_bh(&xfrm_policy_lock);
2721
2722 return ret;
2723 }
2724
2725 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2726 {
2727 int match = 0;
2728
2729 if (t->mode == m->mode && t->id.proto == m->proto &&
2730 (m->reqid == 0 || t->reqid == m->reqid)) {
2731 switch (t->mode) {
2732 case XFRM_MODE_TUNNEL:
2733 case XFRM_MODE_BEET:
2734 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2735 m->old_family) == 0 &&
2736 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2737 m->old_family) == 0) {
2738 match = 1;
2739 }
2740 break;
2741 case XFRM_MODE_TRANSPORT:
2742 /* in case of transport mode, template does not store
2743 any IP addresses, hence we just compare mode and
2744 protocol */
2745 match = 1;
2746 break;
2747 default:
2748 break;
2749 }
2750 }
2751 return match;
2752 }
2753
2754 /* update endpoint address(es) of template(s) */
2755 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2756 struct xfrm_migrate *m, int num_migrate)
2757 {
2758 struct xfrm_migrate *mp;
2759 struct dst_entry *dst;
2760 int i, j, n = 0;
2761
2762 write_lock_bh(&pol->lock);
2763 if (unlikely(pol->walk.dead)) {
2764 /* target policy has been deleted */
2765 write_unlock_bh(&pol->lock);
2766 return -ENOENT;
2767 }
2768
2769 for (i = 0; i < pol->xfrm_nr; i++) {
2770 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2771 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2772 continue;
2773 n++;
2774 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2775 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2776 continue;
2777 /* update endpoints */
2778 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2779 sizeof(pol->xfrm_vec[i].id.daddr));
2780 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2781 sizeof(pol->xfrm_vec[i].saddr));
2782 pol->xfrm_vec[i].encap_family = mp->new_family;
2783 /* flush bundles */
2784 while ((dst = pol->bundles) != NULL) {
2785 pol->bundles = dst->next;
2786 dst_free(dst);
2787 }
2788 }
2789 }
2790
2791 write_unlock_bh(&pol->lock);
2792
2793 if (!n)
2794 return -ENODATA;
2795
2796 return 0;
2797 }
2798
2799 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2800 {
2801 int i, j;
2802
2803 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2804 return -EINVAL;
2805
2806 for (i = 0; i < num_migrate; i++) {
2807 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2808 m[i].old_family) == 0) &&
2809 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2810 m[i].old_family) == 0))
2811 return -EINVAL;
2812 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2813 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2814 return -EINVAL;
2815
2816 /* check if there is any duplicated entry */
2817 for (j = i + 1; j < num_migrate; j++) {
2818 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2819 sizeof(m[i].old_daddr)) &&
2820 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2821 sizeof(m[i].old_saddr)) &&
2822 m[i].proto == m[j].proto &&
2823 m[i].mode == m[j].mode &&
2824 m[i].reqid == m[j].reqid &&
2825 m[i].old_family == m[j].old_family)
2826 return -EINVAL;
2827 }
2828 }
2829
2830 return 0;
2831 }
2832
2833 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2834 struct xfrm_migrate *m, int num_migrate,
2835 struct xfrm_kmaddress *k)
2836 {
2837 int i, err, nx_cur = 0, nx_new = 0;
2838 struct xfrm_policy *pol = NULL;
2839 struct xfrm_state *x, *xc;
2840 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2841 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2842 struct xfrm_migrate *mp;
2843
2844 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2845 goto out;
2846
2847 /* Stage 1 - find policy */
2848 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2849 err = -ENOENT;
2850 goto out;
2851 }
2852
2853 /* Stage 2 - find and update state(s) */
2854 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2855 if ((x = xfrm_migrate_state_find(mp))) {
2856 x_cur[nx_cur] = x;
2857 nx_cur++;
2858 if ((xc = xfrm_state_migrate(x, mp))) {
2859 x_new[nx_new] = xc;
2860 nx_new++;
2861 } else {
2862 err = -ENODATA;
2863 goto restore_state;
2864 }
2865 }
2866 }
2867
2868 /* Stage 3 - update policy */
2869 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2870 goto restore_state;
2871
2872 /* Stage 4 - delete old state(s) */
2873 if (nx_cur) {
2874 xfrm_states_put(x_cur, nx_cur);
2875 xfrm_states_delete(x_cur, nx_cur);
2876 }
2877
2878 /* Stage 5 - announce */
2879 km_migrate(sel, dir, type, m, num_migrate, k);
2880
2881 xfrm_pol_put(pol);
2882
2883 return 0;
2884 out:
2885 return err;
2886
2887 restore_state:
2888 if (pol)
2889 xfrm_pol_put(pol);
2890 if (nx_cur)
2891 xfrm_states_put(x_cur, nx_cur);
2892 if (nx_new)
2893 xfrm_states_delete(x_new, nx_new);
2894
2895 return err;
2896 }
2897 EXPORT_SYMBOL(xfrm_migrate);
2898 #endif
kernel-based virtual machine