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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[deliverable/linux.git] / net / xfrm / xfrm_policy.c
1 /*
2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
13 *
14 */
15
16 #include <linux/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/flow.h>
30 #include <net/xfrm.h>
31 #include <net/ip.h>
32 #ifdef CONFIG_XFRM_STATISTICS
33 #include <net/snmp.h>
34 #endif
35
36 #include "xfrm_hash.h"
37
38 #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39 #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40 #define XFRM_MAX_QUEUE_LEN 100
41
42 struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45 };
46
47 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
48 static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
49 __read_mostly;
50
51 static struct kmem_cache *xfrm_dst_cache __read_mostly;
52
53 static void xfrm_init_pmtu(struct dst_entry *dst);
54 static int stale_bundle(struct dst_entry *dst);
55 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
56 static void xfrm_policy_queue_process(unsigned long arg);
57
58 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
59 int dir);
60
61 static inline bool
62 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
63 {
64 const struct flowi4 *fl4 = &fl->u.ip4;
65
66 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
67 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
68 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
69 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
70 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
71 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
72 }
73
74 static inline bool
75 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
76 {
77 const struct flowi6 *fl6 = &fl->u.ip6;
78
79 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
80 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
81 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
82 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
83 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
84 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
85 }
86
87 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
88 unsigned short family)
89 {
90 switch (family) {
91 case AF_INET:
92 return __xfrm4_selector_match(sel, fl);
93 case AF_INET6:
94 return __xfrm6_selector_match(sel, fl);
95 }
96 return false;
97 }
98
99 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
100 {
101 struct xfrm_policy_afinfo *afinfo;
102
103 if (unlikely(family >= NPROTO))
104 return NULL;
105 rcu_read_lock();
106 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
107 if (unlikely(!afinfo))
108 rcu_read_unlock();
109 return afinfo;
110 }
111
112 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
113 {
114 rcu_read_unlock();
115 }
116
117 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
118 const xfrm_address_t *saddr,
119 const xfrm_address_t *daddr,
120 int family)
121 {
122 struct xfrm_policy_afinfo *afinfo;
123 struct dst_entry *dst;
124
125 afinfo = xfrm_policy_get_afinfo(family);
126 if (unlikely(afinfo == NULL))
127 return ERR_PTR(-EAFNOSUPPORT);
128
129 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
130
131 xfrm_policy_put_afinfo(afinfo);
132
133 return dst;
134 }
135
136 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
137 xfrm_address_t *prev_saddr,
138 xfrm_address_t *prev_daddr,
139 int family)
140 {
141 struct net *net = xs_net(x);
142 xfrm_address_t *saddr = &x->props.saddr;
143 xfrm_address_t *daddr = &x->id.daddr;
144 struct dst_entry *dst;
145
146 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
147 saddr = x->coaddr;
148 daddr = prev_daddr;
149 }
150 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
151 saddr = prev_saddr;
152 daddr = x->coaddr;
153 }
154
155 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
156
157 if (!IS_ERR(dst)) {
158 if (prev_saddr != saddr)
159 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
160 if (prev_daddr != daddr)
161 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
162 }
163
164 return dst;
165 }
166
167 static inline unsigned long make_jiffies(long secs)
168 {
169 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
170 return MAX_SCHEDULE_TIMEOUT-1;
171 else
172 return secs*HZ;
173 }
174
175 static void xfrm_policy_timer(unsigned long data)
176 {
177 struct xfrm_policy *xp = (struct xfrm_policy *)data;
178 unsigned long now = get_seconds();
179 long next = LONG_MAX;
180 int warn = 0;
181 int dir;
182
183 read_lock(&xp->lock);
184
185 if (unlikely(xp->walk.dead))
186 goto out;
187
188 dir = xfrm_policy_id2dir(xp->index);
189
190 if (xp->lft.hard_add_expires_seconds) {
191 long tmo = xp->lft.hard_add_expires_seconds +
192 xp->curlft.add_time - now;
193 if (tmo <= 0)
194 goto expired;
195 if (tmo < next)
196 next = tmo;
197 }
198 if (xp->lft.hard_use_expires_seconds) {
199 long tmo = xp->lft.hard_use_expires_seconds +
200 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
201 if (tmo <= 0)
202 goto expired;
203 if (tmo < next)
204 next = tmo;
205 }
206 if (xp->lft.soft_add_expires_seconds) {
207 long tmo = xp->lft.soft_add_expires_seconds +
208 xp->curlft.add_time - now;
209 if (tmo <= 0) {
210 warn = 1;
211 tmo = XFRM_KM_TIMEOUT;
212 }
213 if (tmo < next)
214 next = tmo;
215 }
216 if (xp->lft.soft_use_expires_seconds) {
217 long tmo = xp->lft.soft_use_expires_seconds +
218 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
219 if (tmo <= 0) {
220 warn = 1;
221 tmo = XFRM_KM_TIMEOUT;
222 }
223 if (tmo < next)
224 next = tmo;
225 }
226
227 if (warn)
228 km_policy_expired(xp, dir, 0, 0);
229 if (next != LONG_MAX &&
230 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
231 xfrm_pol_hold(xp);
232
233 out:
234 read_unlock(&xp->lock);
235 xfrm_pol_put(xp);
236 return;
237
238 expired:
239 read_unlock(&xp->lock);
240 if (!xfrm_policy_delete(xp, dir))
241 km_policy_expired(xp, dir, 1, 0);
242 xfrm_pol_put(xp);
243 }
244
245 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
246 {
247 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
248
249 if (unlikely(pol->walk.dead))
250 flo = NULL;
251 else
252 xfrm_pol_hold(pol);
253
254 return flo;
255 }
256
257 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
258 {
259 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
260
261 return !pol->walk.dead;
262 }
263
264 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
265 {
266 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
267 }
268
269 static const struct flow_cache_ops xfrm_policy_fc_ops = {
270 .get = xfrm_policy_flo_get,
271 .check = xfrm_policy_flo_check,
272 .delete = xfrm_policy_flo_delete,
273 };
274
275 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
276 * SPD calls.
277 */
278
279 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
280 {
281 struct xfrm_policy *policy;
282
283 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
284
285 if (policy) {
286 write_pnet(&policy->xp_net, net);
287 INIT_LIST_HEAD(&policy->walk.all);
288 INIT_HLIST_NODE(&policy->bydst);
289 INIT_HLIST_NODE(&policy->byidx);
290 rwlock_init(&policy->lock);
291 atomic_set(&policy->refcnt, 1);
292 skb_queue_head_init(&policy->polq.hold_queue);
293 setup_timer(&policy->timer, xfrm_policy_timer,
294 (unsigned long)policy);
295 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
296 (unsigned long)policy);
297 policy->flo.ops = &xfrm_policy_fc_ops;
298 }
299 return policy;
300 }
301 EXPORT_SYMBOL(xfrm_policy_alloc);
302
303 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
304
305 void xfrm_policy_destroy(struct xfrm_policy *policy)
306 {
307 BUG_ON(!policy->walk.dead);
308
309 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
310 BUG();
311
312 security_xfrm_policy_free(policy->security);
313 kfree(policy);
314 }
315 EXPORT_SYMBOL(xfrm_policy_destroy);
316
317 static void xfrm_queue_purge(struct sk_buff_head *list)
318 {
319 struct sk_buff *skb;
320
321 while ((skb = skb_dequeue(list)) != NULL)
322 kfree_skb(skb);
323 }
324
325 /* Rule must be locked. Release descentant resources, announce
326 * entry dead. The rule must be unlinked from lists to the moment.
327 */
328
329 static void xfrm_policy_kill(struct xfrm_policy *policy)
330 {
331 policy->walk.dead = 1;
332
333 atomic_inc(&policy->genid);
334
335 if (del_timer(&policy->polq.hold_timer))
336 xfrm_pol_put(policy);
337 xfrm_queue_purge(&policy->polq.hold_queue);
338
339 if (del_timer(&policy->timer))
340 xfrm_pol_put(policy);
341
342 xfrm_pol_put(policy);
343 }
344
345 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
346
347 static inline unsigned int idx_hash(struct net *net, u32 index)
348 {
349 return __idx_hash(index, net->xfrm.policy_idx_hmask);
350 }
351
352 static struct hlist_head *policy_hash_bysel(struct net *net,
353 const struct xfrm_selector *sel,
354 unsigned short family, int dir)
355 {
356 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
357 unsigned int hash = __sel_hash(sel, family, hmask);
358
359 return (hash == hmask + 1 ?
360 &net->xfrm.policy_inexact[dir] :
361 net->xfrm.policy_bydst[dir].table + hash);
362 }
363
364 static struct hlist_head *policy_hash_direct(struct net *net,
365 const xfrm_address_t *daddr,
366 const xfrm_address_t *saddr,
367 unsigned short family, int dir)
368 {
369 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
370 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
371
372 return net->xfrm.policy_bydst[dir].table + hash;
373 }
374
375 static void xfrm_dst_hash_transfer(struct hlist_head *list,
376 struct hlist_head *ndsttable,
377 unsigned int nhashmask)
378 {
379 struct hlist_node *tmp, *entry0 = NULL;
380 struct xfrm_policy *pol;
381 unsigned int h0 = 0;
382
383 redo:
384 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
385 unsigned int h;
386
387 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
388 pol->family, nhashmask);
389 if (!entry0) {
390 hlist_del(&pol->bydst);
391 hlist_add_head(&pol->bydst, ndsttable+h);
392 h0 = h;
393 } else {
394 if (h != h0)
395 continue;
396 hlist_del(&pol->bydst);
397 hlist_add_behind(&pol->bydst, entry0);
398 }
399 entry0 = &pol->bydst;
400 }
401 if (!hlist_empty(list)) {
402 entry0 = NULL;
403 goto redo;
404 }
405 }
406
407 static void xfrm_idx_hash_transfer(struct hlist_head *list,
408 struct hlist_head *nidxtable,
409 unsigned int nhashmask)
410 {
411 struct hlist_node *tmp;
412 struct xfrm_policy *pol;
413
414 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
415 unsigned int h;
416
417 h = __idx_hash(pol->index, nhashmask);
418 hlist_add_head(&pol->byidx, nidxtable+h);
419 }
420 }
421
422 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
423 {
424 return ((old_hmask + 1) << 1) - 1;
425 }
426
427 static void xfrm_bydst_resize(struct net *net, int dir)
428 {
429 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
430 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
431 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
432 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
433 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
434 int i;
435
436 if (!ndst)
437 return;
438
439 write_lock_bh(&net->xfrm.xfrm_policy_lock);
440
441 for (i = hmask; i >= 0; i--)
442 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
443
444 net->xfrm.policy_bydst[dir].table = ndst;
445 net->xfrm.policy_bydst[dir].hmask = nhashmask;
446
447 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
448
449 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
450 }
451
452 static void xfrm_byidx_resize(struct net *net, int total)
453 {
454 unsigned int hmask = net->xfrm.policy_idx_hmask;
455 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
456 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
457 struct hlist_head *oidx = net->xfrm.policy_byidx;
458 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
459 int i;
460
461 if (!nidx)
462 return;
463
464 write_lock_bh(&net->xfrm.xfrm_policy_lock);
465
466 for (i = hmask; i >= 0; i--)
467 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
468
469 net->xfrm.policy_byidx = nidx;
470 net->xfrm.policy_idx_hmask = nhashmask;
471
472 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
473
474 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
475 }
476
477 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
478 {
479 unsigned int cnt = net->xfrm.policy_count[dir];
480 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
481
482 if (total)
483 *total += cnt;
484
485 if ((hmask + 1) < xfrm_policy_hashmax &&
486 cnt > hmask)
487 return 1;
488
489 return 0;
490 }
491
492 static inline int xfrm_byidx_should_resize(struct net *net, int total)
493 {
494 unsigned int hmask = net->xfrm.policy_idx_hmask;
495
496 if ((hmask + 1) < xfrm_policy_hashmax &&
497 total > hmask)
498 return 1;
499
500 return 0;
501 }
502
503 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
504 {
505 read_lock_bh(&net->xfrm.xfrm_policy_lock);
506 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
507 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
508 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
509 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
510 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
511 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
512 si->spdhcnt = net->xfrm.policy_idx_hmask;
513 si->spdhmcnt = xfrm_policy_hashmax;
514 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
515 }
516 EXPORT_SYMBOL(xfrm_spd_getinfo);
517
518 static DEFINE_MUTEX(hash_resize_mutex);
519 static void xfrm_hash_resize(struct work_struct *work)
520 {
521 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
522 int dir, total;
523
524 mutex_lock(&hash_resize_mutex);
525
526 total = 0;
527 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
528 if (xfrm_bydst_should_resize(net, dir, &total))
529 xfrm_bydst_resize(net, dir);
530 }
531 if (xfrm_byidx_should_resize(net, total))
532 xfrm_byidx_resize(net, total);
533
534 mutex_unlock(&hash_resize_mutex);
535 }
536
537 /* Generate new index... KAME seems to generate them ordered by cost
538 * of an absolute inpredictability of ordering of rules. This will not pass. */
539 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
540 {
541 static u32 idx_generator;
542
543 for (;;) {
544 struct hlist_head *list;
545 struct xfrm_policy *p;
546 u32 idx;
547 int found;
548
549 if (!index) {
550 idx = (idx_generator | dir);
551 idx_generator += 8;
552 } else {
553 idx = index;
554 index = 0;
555 }
556
557 if (idx == 0)
558 idx = 8;
559 list = net->xfrm.policy_byidx + idx_hash(net, idx);
560 found = 0;
561 hlist_for_each_entry(p, list, byidx) {
562 if (p->index == idx) {
563 found = 1;
564 break;
565 }
566 }
567 if (!found)
568 return idx;
569 }
570 }
571
572 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
573 {
574 u32 *p1 = (u32 *) s1;
575 u32 *p2 = (u32 *) s2;
576 int len = sizeof(struct xfrm_selector) / sizeof(u32);
577 int i;
578
579 for (i = 0; i < len; i++) {
580 if (p1[i] != p2[i])
581 return 1;
582 }
583
584 return 0;
585 }
586
587 static void xfrm_policy_requeue(struct xfrm_policy *old,
588 struct xfrm_policy *new)
589 {
590 struct xfrm_policy_queue *pq = &old->polq;
591 struct sk_buff_head list;
592
593 __skb_queue_head_init(&list);
594
595 spin_lock_bh(&pq->hold_queue.lock);
596 skb_queue_splice_init(&pq->hold_queue, &list);
597 if (del_timer(&pq->hold_timer))
598 xfrm_pol_put(old);
599 spin_unlock_bh(&pq->hold_queue.lock);
600
601 if (skb_queue_empty(&list))
602 return;
603
604 pq = &new->polq;
605
606 spin_lock_bh(&pq->hold_queue.lock);
607 skb_queue_splice(&list, &pq->hold_queue);
608 pq->timeout = XFRM_QUEUE_TMO_MIN;
609 if (!mod_timer(&pq->hold_timer, jiffies))
610 xfrm_pol_hold(new);
611 spin_unlock_bh(&pq->hold_queue.lock);
612 }
613
614 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
615 struct xfrm_policy *pol)
616 {
617 u32 mark = policy->mark.v & policy->mark.m;
618
619 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
620 return true;
621
622 if ((mark & pol->mark.m) == pol->mark.v &&
623 policy->priority == pol->priority)
624 return true;
625
626 return false;
627 }
628
629 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
630 {
631 struct net *net = xp_net(policy);
632 struct xfrm_policy *pol;
633 struct xfrm_policy *delpol;
634 struct hlist_head *chain;
635 struct hlist_node *newpos;
636
637 write_lock_bh(&net->xfrm.xfrm_policy_lock);
638 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
639 delpol = NULL;
640 newpos = NULL;
641 hlist_for_each_entry(pol, chain, bydst) {
642 if (pol->type == policy->type &&
643 !selector_cmp(&pol->selector, &policy->selector) &&
644 xfrm_policy_mark_match(policy, pol) &&
645 xfrm_sec_ctx_match(pol->security, policy->security) &&
646 !WARN_ON(delpol)) {
647 if (excl) {
648 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
649 return -EEXIST;
650 }
651 delpol = pol;
652 if (policy->priority > pol->priority)
653 continue;
654 } else if (policy->priority >= pol->priority) {
655 newpos = &pol->bydst;
656 continue;
657 }
658 if (delpol)
659 break;
660 }
661 if (newpos)
662 hlist_add_behind(&policy->bydst, newpos);
663 else
664 hlist_add_head(&policy->bydst, chain);
665 xfrm_pol_hold(policy);
666 net->xfrm.policy_count[dir]++;
667 atomic_inc(&net->xfrm.flow_cache_genid);
668
669 /* After previous checking, family can either be AF_INET or AF_INET6 */
670 if (policy->family == AF_INET)
671 rt_genid_bump_ipv4(net);
672 else
673 rt_genid_bump_ipv6(net);
674
675 if (delpol) {
676 xfrm_policy_requeue(delpol, policy);
677 __xfrm_policy_unlink(delpol, dir);
678 }
679 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
680 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
681 policy->curlft.add_time = get_seconds();
682 policy->curlft.use_time = 0;
683 if (!mod_timer(&policy->timer, jiffies + HZ))
684 xfrm_pol_hold(policy);
685 list_add(&policy->walk.all, &net->xfrm.policy_all);
686 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
687
688 if (delpol)
689 xfrm_policy_kill(delpol);
690 else if (xfrm_bydst_should_resize(net, dir, NULL))
691 schedule_work(&net->xfrm.policy_hash_work);
692
693 return 0;
694 }
695 EXPORT_SYMBOL(xfrm_policy_insert);
696
697 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
698 int dir, struct xfrm_selector *sel,
699 struct xfrm_sec_ctx *ctx, int delete,
700 int *err)
701 {
702 struct xfrm_policy *pol, *ret;
703 struct hlist_head *chain;
704
705 *err = 0;
706 write_lock_bh(&net->xfrm.xfrm_policy_lock);
707 chain = policy_hash_bysel(net, sel, sel->family, dir);
708 ret = NULL;
709 hlist_for_each_entry(pol, chain, bydst) {
710 if (pol->type == type &&
711 (mark & pol->mark.m) == pol->mark.v &&
712 !selector_cmp(sel, &pol->selector) &&
713 xfrm_sec_ctx_match(ctx, pol->security)) {
714 xfrm_pol_hold(pol);
715 if (delete) {
716 *err = security_xfrm_policy_delete(
717 pol->security);
718 if (*err) {
719 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
720 return pol;
721 }
722 __xfrm_policy_unlink(pol, dir);
723 }
724 ret = pol;
725 break;
726 }
727 }
728 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
729
730 if (ret && delete)
731 xfrm_policy_kill(ret);
732 return ret;
733 }
734 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
735
736 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
737 int dir, u32 id, int delete, int *err)
738 {
739 struct xfrm_policy *pol, *ret;
740 struct hlist_head *chain;
741
742 *err = -ENOENT;
743 if (xfrm_policy_id2dir(id) != dir)
744 return NULL;
745
746 *err = 0;
747 write_lock_bh(&net->xfrm.xfrm_policy_lock);
748 chain = net->xfrm.policy_byidx + idx_hash(net, id);
749 ret = NULL;
750 hlist_for_each_entry(pol, chain, byidx) {
751 if (pol->type == type && pol->index == id &&
752 (mark & pol->mark.m) == pol->mark.v) {
753 xfrm_pol_hold(pol);
754 if (delete) {
755 *err = security_xfrm_policy_delete(
756 pol->security);
757 if (*err) {
758 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
759 return pol;
760 }
761 __xfrm_policy_unlink(pol, dir);
762 }
763 ret = pol;
764 break;
765 }
766 }
767 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
768
769 if (ret && delete)
770 xfrm_policy_kill(ret);
771 return ret;
772 }
773 EXPORT_SYMBOL(xfrm_policy_byid);
774
775 #ifdef CONFIG_SECURITY_NETWORK_XFRM
776 static inline int
777 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
778 {
779 int dir, err = 0;
780
781 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
782 struct xfrm_policy *pol;
783 int i;
784
785 hlist_for_each_entry(pol,
786 &net->xfrm.policy_inexact[dir], bydst) {
787 if (pol->type != type)
788 continue;
789 err = security_xfrm_policy_delete(pol->security);
790 if (err) {
791 xfrm_audit_policy_delete(pol, 0, task_valid);
792 return err;
793 }
794 }
795 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
796 hlist_for_each_entry(pol,
797 net->xfrm.policy_bydst[dir].table + i,
798 bydst) {
799 if (pol->type != type)
800 continue;
801 err = security_xfrm_policy_delete(
802 pol->security);
803 if (err) {
804 xfrm_audit_policy_delete(pol, 0,
805 task_valid);
806 return err;
807 }
808 }
809 }
810 }
811 return err;
812 }
813 #else
814 static inline int
815 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
816 {
817 return 0;
818 }
819 #endif
820
821 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
822 {
823 int dir, err = 0, cnt = 0;
824
825 write_lock_bh(&net->xfrm.xfrm_policy_lock);
826
827 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
828 if (err)
829 goto out;
830
831 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
832 struct xfrm_policy *pol;
833 int i;
834
835 again1:
836 hlist_for_each_entry(pol,
837 &net->xfrm.policy_inexact[dir], bydst) {
838 if (pol->type != type)
839 continue;
840 __xfrm_policy_unlink(pol, dir);
841 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
842 cnt++;
843
844 xfrm_audit_policy_delete(pol, 1, task_valid);
845
846 xfrm_policy_kill(pol);
847
848 write_lock_bh(&net->xfrm.xfrm_policy_lock);
849 goto again1;
850 }
851
852 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
853 again2:
854 hlist_for_each_entry(pol,
855 net->xfrm.policy_bydst[dir].table + i,
856 bydst) {
857 if (pol->type != type)
858 continue;
859 __xfrm_policy_unlink(pol, dir);
860 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
861 cnt++;
862
863 xfrm_audit_policy_delete(pol, 1, task_valid);
864 xfrm_policy_kill(pol);
865
866 write_lock_bh(&net->xfrm.xfrm_policy_lock);
867 goto again2;
868 }
869 }
870
871 }
872 if (!cnt)
873 err = -ESRCH;
874 out:
875 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
876 return err;
877 }
878 EXPORT_SYMBOL(xfrm_policy_flush);
879
880 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
881 int (*func)(struct xfrm_policy *, int, int, void*),
882 void *data)
883 {
884 struct xfrm_policy *pol;
885 struct xfrm_policy_walk_entry *x;
886 int error = 0;
887
888 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
889 walk->type != XFRM_POLICY_TYPE_ANY)
890 return -EINVAL;
891
892 if (list_empty(&walk->walk.all) && walk->seq != 0)
893 return 0;
894
895 write_lock_bh(&net->xfrm.xfrm_policy_lock);
896 if (list_empty(&walk->walk.all))
897 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
898 else
899 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
900 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
901 if (x->dead)
902 continue;
903 pol = container_of(x, struct xfrm_policy, walk);
904 if (walk->type != XFRM_POLICY_TYPE_ANY &&
905 walk->type != pol->type)
906 continue;
907 error = func(pol, xfrm_policy_id2dir(pol->index),
908 walk->seq, data);
909 if (error) {
910 list_move_tail(&walk->walk.all, &x->all);
911 goto out;
912 }
913 walk->seq++;
914 }
915 if (walk->seq == 0) {
916 error = -ENOENT;
917 goto out;
918 }
919 list_del_init(&walk->walk.all);
920 out:
921 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
922 return error;
923 }
924 EXPORT_SYMBOL(xfrm_policy_walk);
925
926 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
927 {
928 INIT_LIST_HEAD(&walk->walk.all);
929 walk->walk.dead = 1;
930 walk->type = type;
931 walk->seq = 0;
932 }
933 EXPORT_SYMBOL(xfrm_policy_walk_init);
934
935 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
936 {
937 if (list_empty(&walk->walk.all))
938 return;
939
940 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
941 list_del(&walk->walk.all);
942 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
943 }
944 EXPORT_SYMBOL(xfrm_policy_walk_done);
945
946 /*
947 * Find policy to apply to this flow.
948 *
949 * Returns 0 if policy found, else an -errno.
950 */
951 static int xfrm_policy_match(const struct xfrm_policy *pol,
952 const struct flowi *fl,
953 u8 type, u16 family, int dir)
954 {
955 const struct xfrm_selector *sel = &pol->selector;
956 int ret = -ESRCH;
957 bool match;
958
959 if (pol->family != family ||
960 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
961 pol->type != type)
962 return ret;
963
964 match = xfrm_selector_match(sel, fl, family);
965 if (match)
966 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
967 dir);
968
969 return ret;
970 }
971
972 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
973 const struct flowi *fl,
974 u16 family, u8 dir)
975 {
976 int err;
977 struct xfrm_policy *pol, *ret;
978 const xfrm_address_t *daddr, *saddr;
979 struct hlist_head *chain;
980 u32 priority = ~0U;
981
982 daddr = xfrm_flowi_daddr(fl, family);
983 saddr = xfrm_flowi_saddr(fl, family);
984 if (unlikely(!daddr || !saddr))
985 return NULL;
986
987 read_lock_bh(&net->xfrm.xfrm_policy_lock);
988 chain = policy_hash_direct(net, daddr, saddr, family, dir);
989 ret = NULL;
990 hlist_for_each_entry(pol, chain, bydst) {
991 err = xfrm_policy_match(pol, fl, type, family, dir);
992 if (err) {
993 if (err == -ESRCH)
994 continue;
995 else {
996 ret = ERR_PTR(err);
997 goto fail;
998 }
999 } else {
1000 ret = pol;
1001 priority = ret->priority;
1002 break;
1003 }
1004 }
1005 chain = &net->xfrm.policy_inexact[dir];
1006 hlist_for_each_entry(pol, chain, bydst) {
1007 err = xfrm_policy_match(pol, fl, type, family, dir);
1008 if (err) {
1009 if (err == -ESRCH)
1010 continue;
1011 else {
1012 ret = ERR_PTR(err);
1013 goto fail;
1014 }
1015 } else if (pol->priority < priority) {
1016 ret = pol;
1017 break;
1018 }
1019 }
1020 if (ret)
1021 xfrm_pol_hold(ret);
1022 fail:
1023 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1024
1025 return ret;
1026 }
1027
1028 static struct xfrm_policy *
1029 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1030 {
1031 #ifdef CONFIG_XFRM_SUB_POLICY
1032 struct xfrm_policy *pol;
1033
1034 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1035 if (pol != NULL)
1036 return pol;
1037 #endif
1038 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1039 }
1040
1041 static int flow_to_policy_dir(int dir)
1042 {
1043 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1044 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1045 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1046 return dir;
1047
1048 switch (dir) {
1049 default:
1050 case FLOW_DIR_IN:
1051 return XFRM_POLICY_IN;
1052 case FLOW_DIR_OUT:
1053 return XFRM_POLICY_OUT;
1054 case FLOW_DIR_FWD:
1055 return XFRM_POLICY_FWD;
1056 }
1057 }
1058
1059 static struct flow_cache_object *
1060 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1061 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1062 {
1063 struct xfrm_policy *pol;
1064
1065 if (old_obj)
1066 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1067
1068 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1069 if (IS_ERR_OR_NULL(pol))
1070 return ERR_CAST(pol);
1071
1072 /* Resolver returns two references:
1073 * one for cache and one for caller of flow_cache_lookup() */
1074 xfrm_pol_hold(pol);
1075
1076 return &pol->flo;
1077 }
1078
1079 static inline int policy_to_flow_dir(int dir)
1080 {
1081 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1082 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1083 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1084 return dir;
1085 switch (dir) {
1086 default:
1087 case XFRM_POLICY_IN:
1088 return FLOW_DIR_IN;
1089 case XFRM_POLICY_OUT:
1090 return FLOW_DIR_OUT;
1091 case XFRM_POLICY_FWD:
1092 return FLOW_DIR_FWD;
1093 }
1094 }
1095
1096 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1097 const struct flowi *fl)
1098 {
1099 struct xfrm_policy *pol;
1100 struct net *net = sock_net(sk);
1101
1102 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1103 if ((pol = sk->sk_policy[dir]) != NULL) {
1104 bool match = xfrm_selector_match(&pol->selector, fl,
1105 sk->sk_family);
1106 int err = 0;
1107
1108 if (match) {
1109 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1110 pol = NULL;
1111 goto out;
1112 }
1113 err = security_xfrm_policy_lookup(pol->security,
1114 fl->flowi_secid,
1115 policy_to_flow_dir(dir));
1116 if (!err)
1117 xfrm_pol_hold(pol);
1118 else if (err == -ESRCH)
1119 pol = NULL;
1120 else
1121 pol = ERR_PTR(err);
1122 } else
1123 pol = NULL;
1124 }
1125 out:
1126 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1127 return pol;
1128 }
1129
1130 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1131 {
1132 struct net *net = xp_net(pol);
1133 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1134 pol->family, dir);
1135
1136 list_add(&pol->walk.all, &net->xfrm.policy_all);
1137 hlist_add_head(&pol->bydst, chain);
1138 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1139 net->xfrm.policy_count[dir]++;
1140 xfrm_pol_hold(pol);
1141
1142 if (xfrm_bydst_should_resize(net, dir, NULL))
1143 schedule_work(&net->xfrm.policy_hash_work);
1144 }
1145
1146 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1147 int dir)
1148 {
1149 struct net *net = xp_net(pol);
1150
1151 if (hlist_unhashed(&pol->bydst))
1152 return NULL;
1153
1154 hlist_del_init(&pol->bydst);
1155 hlist_del(&pol->byidx);
1156 list_del(&pol->walk.all);
1157 net->xfrm.policy_count[dir]--;
1158
1159 return pol;
1160 }
1161
1162 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1163 {
1164 struct net *net = xp_net(pol);
1165
1166 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1167 pol = __xfrm_policy_unlink(pol, dir);
1168 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1169 if (pol) {
1170 xfrm_policy_kill(pol);
1171 return 0;
1172 }
1173 return -ENOENT;
1174 }
1175 EXPORT_SYMBOL(xfrm_policy_delete);
1176
1177 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1178 {
1179 struct net *net = xp_net(pol);
1180 struct xfrm_policy *old_pol;
1181
1182 #ifdef CONFIG_XFRM_SUB_POLICY
1183 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1184 return -EINVAL;
1185 #endif
1186
1187 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1188 old_pol = sk->sk_policy[dir];
1189 sk->sk_policy[dir] = pol;
1190 if (pol) {
1191 pol->curlft.add_time = get_seconds();
1192 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1193 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1194 }
1195 if (old_pol) {
1196 if (pol)
1197 xfrm_policy_requeue(old_pol, pol);
1198
1199 /* Unlinking succeeds always. This is the only function
1200 * allowed to delete or replace socket policy.
1201 */
1202 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1203 }
1204 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1205
1206 if (old_pol) {
1207 xfrm_policy_kill(old_pol);
1208 }
1209 return 0;
1210 }
1211
1212 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1213 {
1214 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1215 struct net *net = xp_net(old);
1216
1217 if (newp) {
1218 newp->selector = old->selector;
1219 if (security_xfrm_policy_clone(old->security,
1220 &newp->security)) {
1221 kfree(newp);
1222 return NULL; /* ENOMEM */
1223 }
1224 newp->lft = old->lft;
1225 newp->curlft = old->curlft;
1226 newp->mark = old->mark;
1227 newp->action = old->action;
1228 newp->flags = old->flags;
1229 newp->xfrm_nr = old->xfrm_nr;
1230 newp->index = old->index;
1231 newp->type = old->type;
1232 memcpy(newp->xfrm_vec, old->xfrm_vec,
1233 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1234 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1235 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1236 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1237 xfrm_pol_put(newp);
1238 }
1239 return newp;
1240 }
1241
1242 int __xfrm_sk_clone_policy(struct sock *sk)
1243 {
1244 struct xfrm_policy *p0 = sk->sk_policy[0],
1245 *p1 = sk->sk_policy[1];
1246
1247 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1248 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1249 return -ENOMEM;
1250 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1251 return -ENOMEM;
1252 return 0;
1253 }
1254
1255 static int
1256 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1257 unsigned short family)
1258 {
1259 int err;
1260 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1261
1262 if (unlikely(afinfo == NULL))
1263 return -EINVAL;
1264 err = afinfo->get_saddr(net, local, remote);
1265 xfrm_policy_put_afinfo(afinfo);
1266 return err;
1267 }
1268
1269 /* Resolve list of templates for the flow, given policy. */
1270
1271 static int
1272 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1273 struct xfrm_state **xfrm, unsigned short family)
1274 {
1275 struct net *net = xp_net(policy);
1276 int nx;
1277 int i, error;
1278 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1279 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1280 xfrm_address_t tmp;
1281
1282 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1283 struct xfrm_state *x;
1284 xfrm_address_t *remote = daddr;
1285 xfrm_address_t *local = saddr;
1286 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1287
1288 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1289 tmpl->mode == XFRM_MODE_BEET) {
1290 remote = &tmpl->id.daddr;
1291 local = &tmpl->saddr;
1292 if (xfrm_addr_any(local, tmpl->encap_family)) {
1293 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1294 if (error)
1295 goto fail;
1296 local = &tmp;
1297 }
1298 }
1299
1300 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1301
1302 if (x && x->km.state == XFRM_STATE_VALID) {
1303 xfrm[nx++] = x;
1304 daddr = remote;
1305 saddr = local;
1306 continue;
1307 }
1308 if (x) {
1309 error = (x->km.state == XFRM_STATE_ERROR ?
1310 -EINVAL : -EAGAIN);
1311 xfrm_state_put(x);
1312 } else if (error == -ESRCH) {
1313 error = -EAGAIN;
1314 }
1315
1316 if (!tmpl->optional)
1317 goto fail;
1318 }
1319 return nx;
1320
1321 fail:
1322 for (nx--; nx >= 0; nx--)
1323 xfrm_state_put(xfrm[nx]);
1324 return error;
1325 }
1326
1327 static int
1328 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1329 struct xfrm_state **xfrm, unsigned short family)
1330 {
1331 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1332 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1333 int cnx = 0;
1334 int error;
1335 int ret;
1336 int i;
1337
1338 for (i = 0; i < npols; i++) {
1339 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1340 error = -ENOBUFS;
1341 goto fail;
1342 }
1343
1344 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1345 if (ret < 0) {
1346 error = ret;
1347 goto fail;
1348 } else
1349 cnx += ret;
1350 }
1351
1352 /* found states are sorted for outbound processing */
1353 if (npols > 1)
1354 xfrm_state_sort(xfrm, tpp, cnx, family);
1355
1356 return cnx;
1357
1358 fail:
1359 for (cnx--; cnx >= 0; cnx--)
1360 xfrm_state_put(tpp[cnx]);
1361 return error;
1362
1363 }
1364
1365 /* Check that the bundle accepts the flow and its components are
1366 * still valid.
1367 */
1368
1369 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1370 {
1371 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1372 int tos;
1373
1374 if (!afinfo)
1375 return -EINVAL;
1376
1377 tos = afinfo->get_tos(fl);
1378
1379 xfrm_policy_put_afinfo(afinfo);
1380
1381 return tos;
1382 }
1383
1384 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1385 {
1386 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1387 struct dst_entry *dst = &xdst->u.dst;
1388
1389 if (xdst->route == NULL) {
1390 /* Dummy bundle - if it has xfrms we were not
1391 * able to build bundle as template resolution failed.
1392 * It means we need to try again resolving. */
1393 if (xdst->num_xfrms > 0)
1394 return NULL;
1395 } else if (dst->flags & DST_XFRM_QUEUE) {
1396 return NULL;
1397 } else {
1398 /* Real bundle */
1399 if (stale_bundle(dst))
1400 return NULL;
1401 }
1402
1403 dst_hold(dst);
1404 return flo;
1405 }
1406
1407 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1408 {
1409 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1410 struct dst_entry *dst = &xdst->u.dst;
1411
1412 if (!xdst->route)
1413 return 0;
1414 if (stale_bundle(dst))
1415 return 0;
1416
1417 return 1;
1418 }
1419
1420 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1421 {
1422 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1423 struct dst_entry *dst = &xdst->u.dst;
1424
1425 dst_free(dst);
1426 }
1427
1428 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1429 .get = xfrm_bundle_flo_get,
1430 .check = xfrm_bundle_flo_check,
1431 .delete = xfrm_bundle_flo_delete,
1432 };
1433
1434 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1435 {
1436 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1437 struct dst_ops *dst_ops;
1438 struct xfrm_dst *xdst;
1439
1440 if (!afinfo)
1441 return ERR_PTR(-EINVAL);
1442
1443 switch (family) {
1444 case AF_INET:
1445 dst_ops = &net->xfrm.xfrm4_dst_ops;
1446 break;
1447 #if IS_ENABLED(CONFIG_IPV6)
1448 case AF_INET6:
1449 dst_ops = &net->xfrm.xfrm6_dst_ops;
1450 break;
1451 #endif
1452 default:
1453 BUG();
1454 }
1455 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1456
1457 if (likely(xdst)) {
1458 struct dst_entry *dst = &xdst->u.dst;
1459
1460 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1461 xdst->flo.ops = &xfrm_bundle_fc_ops;
1462 if (afinfo->init_dst)
1463 afinfo->init_dst(net, xdst);
1464 } else
1465 xdst = ERR_PTR(-ENOBUFS);
1466
1467 xfrm_policy_put_afinfo(afinfo);
1468
1469 return xdst;
1470 }
1471
1472 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1473 int nfheader_len)
1474 {
1475 struct xfrm_policy_afinfo *afinfo =
1476 xfrm_policy_get_afinfo(dst->ops->family);
1477 int err;
1478
1479 if (!afinfo)
1480 return -EINVAL;
1481
1482 err = afinfo->init_path(path, dst, nfheader_len);
1483
1484 xfrm_policy_put_afinfo(afinfo);
1485
1486 return err;
1487 }
1488
1489 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1490 const struct flowi *fl)
1491 {
1492 struct xfrm_policy_afinfo *afinfo =
1493 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1494 int err;
1495
1496 if (!afinfo)
1497 return -EINVAL;
1498
1499 err = afinfo->fill_dst(xdst, dev, fl);
1500
1501 xfrm_policy_put_afinfo(afinfo);
1502
1503 return err;
1504 }
1505
1506
1507 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1508 * all the metrics... Shortly, bundle a bundle.
1509 */
1510
1511 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1512 struct xfrm_state **xfrm, int nx,
1513 const struct flowi *fl,
1514 struct dst_entry *dst)
1515 {
1516 struct net *net = xp_net(policy);
1517 unsigned long now = jiffies;
1518 struct net_device *dev;
1519 struct xfrm_mode *inner_mode;
1520 struct dst_entry *dst_prev = NULL;
1521 struct dst_entry *dst0 = NULL;
1522 int i = 0;
1523 int err;
1524 int header_len = 0;
1525 int nfheader_len = 0;
1526 int trailer_len = 0;
1527 int tos;
1528 int family = policy->selector.family;
1529 xfrm_address_t saddr, daddr;
1530
1531 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1532
1533 tos = xfrm_get_tos(fl, family);
1534 err = tos;
1535 if (tos < 0)
1536 goto put_states;
1537
1538 dst_hold(dst);
1539
1540 for (; i < nx; i++) {
1541 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1542 struct dst_entry *dst1 = &xdst->u.dst;
1543
1544 err = PTR_ERR(xdst);
1545 if (IS_ERR(xdst)) {
1546 dst_release(dst);
1547 goto put_states;
1548 }
1549
1550 if (xfrm[i]->sel.family == AF_UNSPEC) {
1551 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1552 xfrm_af2proto(family));
1553 if (!inner_mode) {
1554 err = -EAFNOSUPPORT;
1555 dst_release(dst);
1556 goto put_states;
1557 }
1558 } else
1559 inner_mode = xfrm[i]->inner_mode;
1560
1561 if (!dst_prev)
1562 dst0 = dst1;
1563 else {
1564 dst_prev->child = dst_clone(dst1);
1565 dst1->flags |= DST_NOHASH;
1566 }
1567
1568 xdst->route = dst;
1569 dst_copy_metrics(dst1, dst);
1570
1571 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1572 family = xfrm[i]->props.family;
1573 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1574 family);
1575 err = PTR_ERR(dst);
1576 if (IS_ERR(dst))
1577 goto put_states;
1578 } else
1579 dst_hold(dst);
1580
1581 dst1->xfrm = xfrm[i];
1582 xdst->xfrm_genid = xfrm[i]->genid;
1583
1584 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1585 dst1->flags |= DST_HOST;
1586 dst1->lastuse = now;
1587
1588 dst1->input = dst_discard;
1589 dst1->output = inner_mode->afinfo->output;
1590
1591 dst1->next = dst_prev;
1592 dst_prev = dst1;
1593
1594 header_len += xfrm[i]->props.header_len;
1595 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1596 nfheader_len += xfrm[i]->props.header_len;
1597 trailer_len += xfrm[i]->props.trailer_len;
1598 }
1599
1600 dst_prev->child = dst;
1601 dst0->path = dst;
1602
1603 err = -ENODEV;
1604 dev = dst->dev;
1605 if (!dev)
1606 goto free_dst;
1607
1608 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1609 xfrm_init_pmtu(dst_prev);
1610
1611 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1612 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1613
1614 err = xfrm_fill_dst(xdst, dev, fl);
1615 if (err)
1616 goto free_dst;
1617
1618 dst_prev->header_len = header_len;
1619 dst_prev->trailer_len = trailer_len;
1620 header_len -= xdst->u.dst.xfrm->props.header_len;
1621 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1622 }
1623
1624 out:
1625 return dst0;
1626
1627 put_states:
1628 for (; i < nx; i++)
1629 xfrm_state_put(xfrm[i]);
1630 free_dst:
1631 if (dst0)
1632 dst_free(dst0);
1633 dst0 = ERR_PTR(err);
1634 goto out;
1635 }
1636
1637 #ifdef CONFIG_XFRM_SUB_POLICY
1638 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1639 {
1640 if (!*target) {
1641 *target = kmalloc(size, GFP_ATOMIC);
1642 if (!*target)
1643 return -ENOMEM;
1644 }
1645
1646 memcpy(*target, src, size);
1647 return 0;
1648 }
1649 #endif
1650
1651 static int xfrm_dst_update_parent(struct dst_entry *dst,
1652 const struct xfrm_selector *sel)
1653 {
1654 #ifdef CONFIG_XFRM_SUB_POLICY
1655 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1656 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1657 sel, sizeof(*sel));
1658 #else
1659 return 0;
1660 #endif
1661 }
1662
1663 static int xfrm_dst_update_origin(struct dst_entry *dst,
1664 const struct flowi *fl)
1665 {
1666 #ifdef CONFIG_XFRM_SUB_POLICY
1667 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1668 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1669 #else
1670 return 0;
1671 #endif
1672 }
1673
1674 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1675 struct xfrm_policy **pols,
1676 int *num_pols, int *num_xfrms)
1677 {
1678 int i;
1679
1680 if (*num_pols == 0 || !pols[0]) {
1681 *num_pols = 0;
1682 *num_xfrms = 0;
1683 return 0;
1684 }
1685 if (IS_ERR(pols[0]))
1686 return PTR_ERR(pols[0]);
1687
1688 *num_xfrms = pols[0]->xfrm_nr;
1689
1690 #ifdef CONFIG_XFRM_SUB_POLICY
1691 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1692 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1693 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1694 XFRM_POLICY_TYPE_MAIN,
1695 fl, family,
1696 XFRM_POLICY_OUT);
1697 if (pols[1]) {
1698 if (IS_ERR(pols[1])) {
1699 xfrm_pols_put(pols, *num_pols);
1700 return PTR_ERR(pols[1]);
1701 }
1702 (*num_pols)++;
1703 (*num_xfrms) += pols[1]->xfrm_nr;
1704 }
1705 }
1706 #endif
1707 for (i = 0; i < *num_pols; i++) {
1708 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1709 *num_xfrms = -1;
1710 break;
1711 }
1712 }
1713
1714 return 0;
1715
1716 }
1717
1718 static struct xfrm_dst *
1719 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1720 const struct flowi *fl, u16 family,
1721 struct dst_entry *dst_orig)
1722 {
1723 struct net *net = xp_net(pols[0]);
1724 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1725 struct dst_entry *dst;
1726 struct xfrm_dst *xdst;
1727 int err;
1728
1729 /* Try to instantiate a bundle */
1730 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1731 if (err <= 0) {
1732 if (err != 0 && err != -EAGAIN)
1733 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1734 return ERR_PTR(err);
1735 }
1736
1737 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1738 if (IS_ERR(dst)) {
1739 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1740 return ERR_CAST(dst);
1741 }
1742
1743 xdst = (struct xfrm_dst *)dst;
1744 xdst->num_xfrms = err;
1745 if (num_pols > 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 dst_free(dst);
1751 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1752 return ERR_PTR(err);
1753 }
1754
1755 xdst->num_pols = num_pols;
1756 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1757 xdst->policy_genid = atomic_read(&pols[0]->genid);
1758
1759 return xdst;
1760 }
1761
1762 static void xfrm_policy_queue_process(unsigned long arg)
1763 {
1764 int err = 0;
1765 struct sk_buff *skb;
1766 struct sock *sk;
1767 struct dst_entry *dst;
1768 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1769 struct xfrm_policy_queue *pq = &pol->polq;
1770 struct flowi fl;
1771 struct sk_buff_head list;
1772
1773 spin_lock(&pq->hold_queue.lock);
1774 skb = skb_peek(&pq->hold_queue);
1775 if (!skb) {
1776 spin_unlock(&pq->hold_queue.lock);
1777 goto out;
1778 }
1779 dst = skb_dst(skb);
1780 sk = skb->sk;
1781 xfrm_decode_session(skb, &fl, dst->ops->family);
1782 spin_unlock(&pq->hold_queue.lock);
1783
1784 dst_hold(dst->path);
1785 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1786 sk, 0);
1787 if (IS_ERR(dst))
1788 goto purge_queue;
1789
1790 if (dst->flags & DST_XFRM_QUEUE) {
1791 dst_release(dst);
1792
1793 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1794 goto purge_queue;
1795
1796 pq->timeout = pq->timeout << 1;
1797 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1798 xfrm_pol_hold(pol);
1799 goto out;
1800 }
1801
1802 dst_release(dst);
1803
1804 __skb_queue_head_init(&list);
1805
1806 spin_lock(&pq->hold_queue.lock);
1807 pq->timeout = 0;
1808 skb_queue_splice_init(&pq->hold_queue, &list);
1809 spin_unlock(&pq->hold_queue.lock);
1810
1811 while (!skb_queue_empty(&list)) {
1812 skb = __skb_dequeue(&list);
1813
1814 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1815 dst_hold(skb_dst(skb)->path);
1816 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1817 &fl, skb->sk, 0);
1818 if (IS_ERR(dst)) {
1819 kfree_skb(skb);
1820 continue;
1821 }
1822
1823 nf_reset(skb);
1824 skb_dst_drop(skb);
1825 skb_dst_set(skb, dst);
1826
1827 err = dst_output(skb);
1828 }
1829
1830 out:
1831 xfrm_pol_put(pol);
1832 return;
1833
1834 purge_queue:
1835 pq->timeout = 0;
1836 xfrm_queue_purge(&pq->hold_queue);
1837 xfrm_pol_put(pol);
1838 }
1839
1840 static int xdst_queue_output(struct sock *sk, struct sk_buff *skb)
1841 {
1842 unsigned long sched_next;
1843 struct dst_entry *dst = skb_dst(skb);
1844 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1845 struct xfrm_policy *pol = xdst->pols[0];
1846 struct xfrm_policy_queue *pq = &pol->polq;
1847 const struct sk_buff *fclone = skb + 1;
1848
1849 if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
1850 fclone->fclone == SKB_FCLONE_CLONE)) {
1851 kfree_skb(skb);
1852 return 0;
1853 }
1854
1855 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1856 kfree_skb(skb);
1857 return -EAGAIN;
1858 }
1859
1860 skb_dst_force(skb);
1861
1862 spin_lock_bh(&pq->hold_queue.lock);
1863
1864 if (!pq->timeout)
1865 pq->timeout = XFRM_QUEUE_TMO_MIN;
1866
1867 sched_next = jiffies + pq->timeout;
1868
1869 if (del_timer(&pq->hold_timer)) {
1870 if (time_before(pq->hold_timer.expires, sched_next))
1871 sched_next = pq->hold_timer.expires;
1872 xfrm_pol_put(pol);
1873 }
1874
1875 __skb_queue_tail(&pq->hold_queue, skb);
1876 if (!mod_timer(&pq->hold_timer, sched_next))
1877 xfrm_pol_hold(pol);
1878
1879 spin_unlock_bh(&pq->hold_queue.lock);
1880
1881 return 0;
1882 }
1883
1884 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
1885 struct xfrm_flo *xflo,
1886 const struct flowi *fl,
1887 int num_xfrms,
1888 u16 family)
1889 {
1890 int err;
1891 struct net_device *dev;
1892 struct dst_entry *dst;
1893 struct dst_entry *dst1;
1894 struct xfrm_dst *xdst;
1895
1896 xdst = xfrm_alloc_dst(net, family);
1897 if (IS_ERR(xdst))
1898 return xdst;
1899
1900 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
1901 net->xfrm.sysctl_larval_drop ||
1902 num_xfrms <= 0)
1903 return xdst;
1904
1905 dst = xflo->dst_orig;
1906 dst1 = &xdst->u.dst;
1907 dst_hold(dst);
1908 xdst->route = dst;
1909
1910 dst_copy_metrics(dst1, dst);
1911
1912 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1913 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
1914 dst1->lastuse = jiffies;
1915
1916 dst1->input = dst_discard;
1917 dst1->output = xdst_queue_output;
1918
1919 dst_hold(dst);
1920 dst1->child = dst;
1921 dst1->path = dst;
1922
1923 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
1924
1925 err = -ENODEV;
1926 dev = dst->dev;
1927 if (!dev)
1928 goto free_dst;
1929
1930 err = xfrm_fill_dst(xdst, dev, fl);
1931 if (err)
1932 goto free_dst;
1933
1934 out:
1935 return xdst;
1936
1937 free_dst:
1938 dst_release(dst1);
1939 xdst = ERR_PTR(err);
1940 goto out;
1941 }
1942
1943 static struct flow_cache_object *
1944 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1945 struct flow_cache_object *oldflo, void *ctx)
1946 {
1947 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
1948 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1949 struct xfrm_dst *xdst, *new_xdst;
1950 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1951
1952 /* Check if the policies from old bundle are usable */
1953 xdst = NULL;
1954 if (oldflo) {
1955 xdst = container_of(oldflo, struct xfrm_dst, flo);
1956 num_pols = xdst->num_pols;
1957 num_xfrms = xdst->num_xfrms;
1958 pol_dead = 0;
1959 for (i = 0; i < num_pols; i++) {
1960 pols[i] = xdst->pols[i];
1961 pol_dead |= pols[i]->walk.dead;
1962 }
1963 if (pol_dead) {
1964 dst_free(&xdst->u.dst);
1965 xdst = NULL;
1966 num_pols = 0;
1967 num_xfrms = 0;
1968 oldflo = NULL;
1969 }
1970 }
1971
1972 /* Resolve policies to use if we couldn't get them from
1973 * previous cache entry */
1974 if (xdst == NULL) {
1975 num_pols = 1;
1976 pols[0] = __xfrm_policy_lookup(net, fl, family,
1977 flow_to_policy_dir(dir));
1978 err = xfrm_expand_policies(fl, family, pols,
1979 &num_pols, &num_xfrms);
1980 if (err < 0)
1981 goto inc_error;
1982 if (num_pols == 0)
1983 return NULL;
1984 if (num_xfrms <= 0)
1985 goto make_dummy_bundle;
1986 }
1987
1988 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
1989 xflo->dst_orig);
1990 if (IS_ERR(new_xdst)) {
1991 err = PTR_ERR(new_xdst);
1992 if (err != -EAGAIN)
1993 goto error;
1994 if (oldflo == NULL)
1995 goto make_dummy_bundle;
1996 dst_hold(&xdst->u.dst);
1997 return oldflo;
1998 } else if (new_xdst == NULL) {
1999 num_xfrms = 0;
2000 if (oldflo == NULL)
2001 goto make_dummy_bundle;
2002 xdst->num_xfrms = 0;
2003 dst_hold(&xdst->u.dst);
2004 return oldflo;
2005 }
2006
2007 /* Kill the previous bundle */
2008 if (xdst) {
2009 /* The policies were stolen for newly generated bundle */
2010 xdst->num_pols = 0;
2011 dst_free(&xdst->u.dst);
2012 }
2013
2014 /* Flow cache does not have reference, it dst_free()'s,
2015 * but we do need to return one reference for original caller */
2016 dst_hold(&new_xdst->u.dst);
2017 return &new_xdst->flo;
2018
2019 make_dummy_bundle:
2020 /* We found policies, but there's no bundles to instantiate:
2021 * either because the policy blocks, has no transformations or
2022 * we could not build template (no xfrm_states).*/
2023 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2024 if (IS_ERR(xdst)) {
2025 xfrm_pols_put(pols, num_pols);
2026 return ERR_CAST(xdst);
2027 }
2028 xdst->num_pols = num_pols;
2029 xdst->num_xfrms = num_xfrms;
2030 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2031
2032 dst_hold(&xdst->u.dst);
2033 return &xdst->flo;
2034
2035 inc_error:
2036 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2037 error:
2038 if (xdst != NULL)
2039 dst_free(&xdst->u.dst);
2040 else
2041 xfrm_pols_put(pols, num_pols);
2042 return ERR_PTR(err);
2043 }
2044
2045 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2046 struct dst_entry *dst_orig)
2047 {
2048 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2049 struct dst_entry *ret;
2050
2051 if (!afinfo) {
2052 dst_release(dst_orig);
2053 return ERR_PTR(-EINVAL);
2054 } else {
2055 ret = afinfo->blackhole_route(net, dst_orig);
2056 }
2057 xfrm_policy_put_afinfo(afinfo);
2058
2059 return ret;
2060 }
2061
2062 /* Main function: finds/creates a bundle for given flow.
2063 *
2064 * At the moment we eat a raw IP route. Mostly to speed up lookups
2065 * on interfaces with disabled IPsec.
2066 */
2067 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2068 const struct flowi *fl,
2069 struct sock *sk, int flags)
2070 {
2071 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2072 struct flow_cache_object *flo;
2073 struct xfrm_dst *xdst;
2074 struct dst_entry *dst, *route;
2075 u16 family = dst_orig->ops->family;
2076 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2077 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2078
2079 dst = NULL;
2080 xdst = NULL;
2081 route = NULL;
2082
2083 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2084 num_pols = 1;
2085 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2086 err = xfrm_expand_policies(fl, family, pols,
2087 &num_pols, &num_xfrms);
2088 if (err < 0)
2089 goto dropdst;
2090
2091 if (num_pols) {
2092 if (num_xfrms <= 0) {
2093 drop_pols = num_pols;
2094 goto no_transform;
2095 }
2096
2097 xdst = xfrm_resolve_and_create_bundle(
2098 pols, num_pols, fl,
2099 family, dst_orig);
2100 if (IS_ERR(xdst)) {
2101 xfrm_pols_put(pols, num_pols);
2102 err = PTR_ERR(xdst);
2103 goto dropdst;
2104 } else if (xdst == NULL) {
2105 num_xfrms = 0;
2106 drop_pols = num_pols;
2107 goto no_transform;
2108 }
2109
2110 dst_hold(&xdst->u.dst);
2111 xdst->u.dst.flags |= DST_NOCACHE;
2112 route = xdst->route;
2113 }
2114 }
2115
2116 if (xdst == NULL) {
2117 struct xfrm_flo xflo;
2118
2119 xflo.dst_orig = dst_orig;
2120 xflo.flags = flags;
2121
2122 /* To accelerate a bit... */
2123 if ((dst_orig->flags & DST_NOXFRM) ||
2124 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2125 goto nopol;
2126
2127 flo = flow_cache_lookup(net, fl, family, dir,
2128 xfrm_bundle_lookup, &xflo);
2129 if (flo == NULL)
2130 goto nopol;
2131 if (IS_ERR(flo)) {
2132 err = PTR_ERR(flo);
2133 goto dropdst;
2134 }
2135 xdst = container_of(flo, struct xfrm_dst, flo);
2136
2137 num_pols = xdst->num_pols;
2138 num_xfrms = xdst->num_xfrms;
2139 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2140 route = xdst->route;
2141 }
2142
2143 dst = &xdst->u.dst;
2144 if (route == NULL && num_xfrms > 0) {
2145 /* The only case when xfrm_bundle_lookup() returns a
2146 * bundle with null route, is when the template could
2147 * not be resolved. It means policies are there, but
2148 * bundle could not be created, since we don't yet
2149 * have the xfrm_state's. We need to wait for KM to
2150 * negotiate new SA's or bail out with error.*/
2151 if (net->xfrm.sysctl_larval_drop) {
2152 dst_release(dst);
2153 xfrm_pols_put(pols, drop_pols);
2154 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2155
2156 return ERR_PTR(-EREMOTE);
2157 }
2158
2159 err = -EAGAIN;
2160
2161 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2162 goto error;
2163 }
2164
2165 no_transform:
2166 if (num_pols == 0)
2167 goto nopol;
2168
2169 if ((flags & XFRM_LOOKUP_ICMP) &&
2170 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2171 err = -ENOENT;
2172 goto error;
2173 }
2174
2175 for (i = 0; i < num_pols; i++)
2176 pols[i]->curlft.use_time = get_seconds();
2177
2178 if (num_xfrms < 0) {
2179 /* Prohibit the flow */
2180 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2181 err = -EPERM;
2182 goto error;
2183 } else if (num_xfrms > 0) {
2184 /* Flow transformed */
2185 dst_release(dst_orig);
2186 } else {
2187 /* Flow passes untransformed */
2188 dst_release(dst);
2189 dst = dst_orig;
2190 }
2191 ok:
2192 xfrm_pols_put(pols, drop_pols);
2193 if (dst && dst->xfrm &&
2194 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2195 dst->flags |= DST_XFRM_TUNNEL;
2196 return dst;
2197
2198 nopol:
2199 if (!(flags & XFRM_LOOKUP_ICMP)) {
2200 dst = dst_orig;
2201 goto ok;
2202 }
2203 err = -ENOENT;
2204 error:
2205 dst_release(dst);
2206 dropdst:
2207 dst_release(dst_orig);
2208 xfrm_pols_put(pols, drop_pols);
2209 return ERR_PTR(err);
2210 }
2211 EXPORT_SYMBOL(xfrm_lookup);
2212
2213 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2214 * Otherwise we may send out blackholed packets.
2215 */
2216 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2217 const struct flowi *fl,
2218 struct sock *sk, int flags)
2219 {
2220 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2221 flags | XFRM_LOOKUP_QUEUE);
2222
2223 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2224 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2225
2226 return dst;
2227 }
2228 EXPORT_SYMBOL(xfrm_lookup_route);
2229
2230 static inline int
2231 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2232 {
2233 struct xfrm_state *x;
2234
2235 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2236 return 0;
2237 x = skb->sp->xvec[idx];
2238 if (!x->type->reject)
2239 return 0;
2240 return x->type->reject(x, skb, fl);
2241 }
2242
2243 /* When skb is transformed back to its "native" form, we have to
2244 * check policy restrictions. At the moment we make this in maximally
2245 * stupid way. Shame on me. :-) Of course, connected sockets must
2246 * have policy cached at them.
2247 */
2248
2249 static inline int
2250 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2251 unsigned short family)
2252 {
2253 if (xfrm_state_kern(x))
2254 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2255 return x->id.proto == tmpl->id.proto &&
2256 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2257 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2258 x->props.mode == tmpl->mode &&
2259 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2260 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2261 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2262 xfrm_state_addr_cmp(tmpl, x, family));
2263 }
2264
2265 /*
2266 * 0 or more than 0 is returned when validation is succeeded (either bypass
2267 * because of optional transport mode, or next index of the mathced secpath
2268 * state with the template.
2269 * -1 is returned when no matching template is found.
2270 * Otherwise "-2 - errored_index" is returned.
2271 */
2272 static inline int
2273 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2274 unsigned short family)
2275 {
2276 int idx = start;
2277
2278 if (tmpl->optional) {
2279 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2280 return start;
2281 } else
2282 start = -1;
2283 for (; idx < sp->len; idx++) {
2284 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2285 return ++idx;
2286 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2287 if (start == -1)
2288 start = -2-idx;
2289 break;
2290 }
2291 }
2292 return start;
2293 }
2294
2295 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2296 unsigned int family, int reverse)
2297 {
2298 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2299 int err;
2300
2301 if (unlikely(afinfo == NULL))
2302 return -EAFNOSUPPORT;
2303
2304 afinfo->decode_session(skb, fl, reverse);
2305 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2306 xfrm_policy_put_afinfo(afinfo);
2307 return err;
2308 }
2309 EXPORT_SYMBOL(__xfrm_decode_session);
2310
2311 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2312 {
2313 for (; k < sp->len; k++) {
2314 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2315 *idxp = k;
2316 return 1;
2317 }
2318 }
2319
2320 return 0;
2321 }
2322
2323 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2324 unsigned short family)
2325 {
2326 struct net *net = dev_net(skb->dev);
2327 struct xfrm_policy *pol;
2328 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2329 int npols = 0;
2330 int xfrm_nr;
2331 int pi;
2332 int reverse;
2333 struct flowi fl;
2334 u8 fl_dir;
2335 int xerr_idx = -1;
2336
2337 reverse = dir & ~XFRM_POLICY_MASK;
2338 dir &= XFRM_POLICY_MASK;
2339 fl_dir = policy_to_flow_dir(dir);
2340
2341 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2342 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2343 return 0;
2344 }
2345
2346 nf_nat_decode_session(skb, &fl, family);
2347
2348 /* First, check used SA against their selectors. */
2349 if (skb->sp) {
2350 int i;
2351
2352 for (i = skb->sp->len-1; i >= 0; i--) {
2353 struct xfrm_state *x = skb->sp->xvec[i];
2354 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2355 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2356 return 0;
2357 }
2358 }
2359 }
2360
2361 pol = NULL;
2362 if (sk && sk->sk_policy[dir]) {
2363 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2364 if (IS_ERR(pol)) {
2365 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2366 return 0;
2367 }
2368 }
2369
2370 if (!pol) {
2371 struct flow_cache_object *flo;
2372
2373 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2374 xfrm_policy_lookup, NULL);
2375 if (IS_ERR_OR_NULL(flo))
2376 pol = ERR_CAST(flo);
2377 else
2378 pol = container_of(flo, struct xfrm_policy, flo);
2379 }
2380
2381 if (IS_ERR(pol)) {
2382 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2383 return 0;
2384 }
2385
2386 if (!pol) {
2387 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2388 xfrm_secpath_reject(xerr_idx, skb, &fl);
2389 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2390 return 0;
2391 }
2392 return 1;
2393 }
2394
2395 pol->curlft.use_time = get_seconds();
2396
2397 pols[0] = pol;
2398 npols++;
2399 #ifdef CONFIG_XFRM_SUB_POLICY
2400 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2401 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2402 &fl, family,
2403 XFRM_POLICY_IN);
2404 if (pols[1]) {
2405 if (IS_ERR(pols[1])) {
2406 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2407 return 0;
2408 }
2409 pols[1]->curlft.use_time = get_seconds();
2410 npols++;
2411 }
2412 }
2413 #endif
2414
2415 if (pol->action == XFRM_POLICY_ALLOW) {
2416 struct sec_path *sp;
2417 static struct sec_path dummy;
2418 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2419 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2420 struct xfrm_tmpl **tpp = tp;
2421 int ti = 0;
2422 int i, k;
2423
2424 if ((sp = skb->sp) == NULL)
2425 sp = &dummy;
2426
2427 for (pi = 0; pi < npols; pi++) {
2428 if (pols[pi] != pol &&
2429 pols[pi]->action != XFRM_POLICY_ALLOW) {
2430 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2431 goto reject;
2432 }
2433 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2434 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2435 goto reject_error;
2436 }
2437 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2438 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2439 }
2440 xfrm_nr = ti;
2441 if (npols > 1) {
2442 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2443 tpp = stp;
2444 }
2445
2446 /* For each tunnel xfrm, find the first matching tmpl.
2447 * For each tmpl before that, find corresponding xfrm.
2448 * Order is _important_. Later we will implement
2449 * some barriers, but at the moment barriers
2450 * are implied between each two transformations.
2451 */
2452 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2453 k = xfrm_policy_ok(tpp[i], sp, k, family);
2454 if (k < 0) {
2455 if (k < -1)
2456 /* "-2 - errored_index" returned */
2457 xerr_idx = -(2+k);
2458 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2459 goto reject;
2460 }
2461 }
2462
2463 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2464 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2465 goto reject;
2466 }
2467
2468 xfrm_pols_put(pols, npols);
2469 return 1;
2470 }
2471 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2472
2473 reject:
2474 xfrm_secpath_reject(xerr_idx, skb, &fl);
2475 reject_error:
2476 xfrm_pols_put(pols, npols);
2477 return 0;
2478 }
2479 EXPORT_SYMBOL(__xfrm_policy_check);
2480
2481 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2482 {
2483 struct net *net = dev_net(skb->dev);
2484 struct flowi fl;
2485 struct dst_entry *dst;
2486 int res = 1;
2487
2488 if (xfrm_decode_session(skb, &fl, family) < 0) {
2489 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2490 return 0;
2491 }
2492
2493 skb_dst_force(skb);
2494
2495 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2496 if (IS_ERR(dst)) {
2497 res = 0;
2498 dst = NULL;
2499 }
2500 skb_dst_set(skb, dst);
2501 return res;
2502 }
2503 EXPORT_SYMBOL(__xfrm_route_forward);
2504
2505 /* Optimize later using cookies and generation ids. */
2506
2507 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2508 {
2509 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2510 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2511 * get validated by dst_ops->check on every use. We do this
2512 * because when a normal route referenced by an XFRM dst is
2513 * obsoleted we do not go looking around for all parent
2514 * referencing XFRM dsts so that we can invalidate them. It
2515 * is just too much work. Instead we make the checks here on
2516 * every use. For example:
2517 *
2518 * XFRM dst A --> IPv4 dst X
2519 *
2520 * X is the "xdst->route" of A (X is also the "dst->path" of A
2521 * in this example). If X is marked obsolete, "A" will not
2522 * notice. That's what we are validating here via the
2523 * stale_bundle() check.
2524 *
2525 * When a policy's bundle is pruned, we dst_free() the XFRM
2526 * dst which causes it's ->obsolete field to be set to
2527 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2528 * this, we want to force a new route lookup.
2529 */
2530 if (dst->obsolete < 0 && !stale_bundle(dst))
2531 return dst;
2532
2533 return NULL;
2534 }
2535
2536 static int stale_bundle(struct dst_entry *dst)
2537 {
2538 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2539 }
2540
2541 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2542 {
2543 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2544 dst->dev = dev_net(dev)->loopback_dev;
2545 dev_hold(dst->dev);
2546 dev_put(dev);
2547 }
2548 }
2549 EXPORT_SYMBOL(xfrm_dst_ifdown);
2550
2551 static void xfrm_link_failure(struct sk_buff *skb)
2552 {
2553 /* Impossible. Such dst must be popped before reaches point of failure. */
2554 }
2555
2556 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2557 {
2558 if (dst) {
2559 if (dst->obsolete) {
2560 dst_release(dst);
2561 dst = NULL;
2562 }
2563 }
2564 return dst;
2565 }
2566
2567 void xfrm_garbage_collect(struct net *net)
2568 {
2569 flow_cache_flush(net);
2570 }
2571 EXPORT_SYMBOL(xfrm_garbage_collect);
2572
2573 static void xfrm_garbage_collect_deferred(struct net *net)
2574 {
2575 flow_cache_flush_deferred(net);
2576 }
2577
2578 static void xfrm_init_pmtu(struct dst_entry *dst)
2579 {
2580 do {
2581 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2582 u32 pmtu, route_mtu_cached;
2583
2584 pmtu = dst_mtu(dst->child);
2585 xdst->child_mtu_cached = pmtu;
2586
2587 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2588
2589 route_mtu_cached = dst_mtu(xdst->route);
2590 xdst->route_mtu_cached = route_mtu_cached;
2591
2592 if (pmtu > route_mtu_cached)
2593 pmtu = route_mtu_cached;
2594
2595 dst_metric_set(dst, RTAX_MTU, pmtu);
2596 } while ((dst = dst->next));
2597 }
2598
2599 /* Check that the bundle accepts the flow and its components are
2600 * still valid.
2601 */
2602
2603 static int xfrm_bundle_ok(struct xfrm_dst *first)
2604 {
2605 struct dst_entry *dst = &first->u.dst;
2606 struct xfrm_dst *last;
2607 u32 mtu;
2608
2609 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2610 (dst->dev && !netif_running(dst->dev)))
2611 return 0;
2612
2613 if (dst->flags & DST_XFRM_QUEUE)
2614 return 1;
2615
2616 last = NULL;
2617
2618 do {
2619 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2620
2621 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2622 return 0;
2623 if (xdst->xfrm_genid != dst->xfrm->genid)
2624 return 0;
2625 if (xdst->num_pols > 0 &&
2626 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2627 return 0;
2628
2629 mtu = dst_mtu(dst->child);
2630 if (xdst->child_mtu_cached != mtu) {
2631 last = xdst;
2632 xdst->child_mtu_cached = mtu;
2633 }
2634
2635 if (!dst_check(xdst->route, xdst->route_cookie))
2636 return 0;
2637 mtu = dst_mtu(xdst->route);
2638 if (xdst->route_mtu_cached != mtu) {
2639 last = xdst;
2640 xdst->route_mtu_cached = mtu;
2641 }
2642
2643 dst = dst->child;
2644 } while (dst->xfrm);
2645
2646 if (likely(!last))
2647 return 1;
2648
2649 mtu = last->child_mtu_cached;
2650 for (;;) {
2651 dst = &last->u.dst;
2652
2653 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2654 if (mtu > last->route_mtu_cached)
2655 mtu = last->route_mtu_cached;
2656 dst_metric_set(dst, RTAX_MTU, mtu);
2657
2658 if (last == first)
2659 break;
2660
2661 last = (struct xfrm_dst *)last->u.dst.next;
2662 last->child_mtu_cached = mtu;
2663 }
2664
2665 return 1;
2666 }
2667
2668 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2669 {
2670 return dst_metric_advmss(dst->path);
2671 }
2672
2673 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2674 {
2675 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2676
2677 return mtu ? : dst_mtu(dst->path);
2678 }
2679
2680 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2681 struct sk_buff *skb,
2682 const void *daddr)
2683 {
2684 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2685 }
2686
2687 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2688 {
2689 struct net *net;
2690 int err = 0;
2691 if (unlikely(afinfo == NULL))
2692 return -EINVAL;
2693 if (unlikely(afinfo->family >= NPROTO))
2694 return -EAFNOSUPPORT;
2695 spin_lock(&xfrm_policy_afinfo_lock);
2696 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2697 err = -ENOBUFS;
2698 else {
2699 struct dst_ops *dst_ops = afinfo->dst_ops;
2700 if (likely(dst_ops->kmem_cachep == NULL))
2701 dst_ops->kmem_cachep = xfrm_dst_cache;
2702 if (likely(dst_ops->check == NULL))
2703 dst_ops->check = xfrm_dst_check;
2704 if (likely(dst_ops->default_advmss == NULL))
2705 dst_ops->default_advmss = xfrm_default_advmss;
2706 if (likely(dst_ops->mtu == NULL))
2707 dst_ops->mtu = xfrm_mtu;
2708 if (likely(dst_ops->negative_advice == NULL))
2709 dst_ops->negative_advice = xfrm_negative_advice;
2710 if (likely(dst_ops->link_failure == NULL))
2711 dst_ops->link_failure = xfrm_link_failure;
2712 if (likely(dst_ops->neigh_lookup == NULL))
2713 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2714 if (likely(afinfo->garbage_collect == NULL))
2715 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2716 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2717 }
2718 spin_unlock(&xfrm_policy_afinfo_lock);
2719
2720 rtnl_lock();
2721 for_each_net(net) {
2722 struct dst_ops *xfrm_dst_ops;
2723
2724 switch (afinfo->family) {
2725 case AF_INET:
2726 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2727 break;
2728 #if IS_ENABLED(CONFIG_IPV6)
2729 case AF_INET6:
2730 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2731 break;
2732 #endif
2733 default:
2734 BUG();
2735 }
2736 *xfrm_dst_ops = *afinfo->dst_ops;
2737 }
2738 rtnl_unlock();
2739
2740 return err;
2741 }
2742 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2743
2744 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2745 {
2746 int err = 0;
2747 if (unlikely(afinfo == NULL))
2748 return -EINVAL;
2749 if (unlikely(afinfo->family >= NPROTO))
2750 return -EAFNOSUPPORT;
2751 spin_lock(&xfrm_policy_afinfo_lock);
2752 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2753 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2754 err = -EINVAL;
2755 else
2756 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2757 NULL);
2758 }
2759 spin_unlock(&xfrm_policy_afinfo_lock);
2760 if (!err) {
2761 struct dst_ops *dst_ops = afinfo->dst_ops;
2762
2763 synchronize_rcu();
2764
2765 dst_ops->kmem_cachep = NULL;
2766 dst_ops->check = NULL;
2767 dst_ops->negative_advice = NULL;
2768 dst_ops->link_failure = NULL;
2769 afinfo->garbage_collect = NULL;
2770 }
2771 return err;
2772 }
2773 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2774
2775 static void __net_init xfrm_dst_ops_init(struct net *net)
2776 {
2777 struct xfrm_policy_afinfo *afinfo;
2778
2779 rcu_read_lock();
2780 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2781 if (afinfo)
2782 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2783 #if IS_ENABLED(CONFIG_IPV6)
2784 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2785 if (afinfo)
2786 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2787 #endif
2788 rcu_read_unlock();
2789 }
2790
2791 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2792 {
2793 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2794
2795 switch (event) {
2796 case NETDEV_DOWN:
2797 xfrm_garbage_collect(dev_net(dev));
2798 }
2799 return NOTIFY_DONE;
2800 }
2801
2802 static struct notifier_block xfrm_dev_notifier = {
2803 .notifier_call = xfrm_dev_event,
2804 };
2805
2806 #ifdef CONFIG_XFRM_STATISTICS
2807 static int __net_init xfrm_statistics_init(struct net *net)
2808 {
2809 int rv;
2810 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2811 if (!net->mib.xfrm_statistics)
2812 return -ENOMEM;
2813 rv = xfrm_proc_init(net);
2814 if (rv < 0)
2815 free_percpu(net->mib.xfrm_statistics);
2816 return rv;
2817 }
2818
2819 static void xfrm_statistics_fini(struct net *net)
2820 {
2821 xfrm_proc_fini(net);
2822 free_percpu(net->mib.xfrm_statistics);
2823 }
2824 #else
2825 static int __net_init xfrm_statistics_init(struct net *net)
2826 {
2827 return 0;
2828 }
2829
2830 static void xfrm_statistics_fini(struct net *net)
2831 {
2832 }
2833 #endif
2834
2835 static int __net_init xfrm_policy_init(struct net *net)
2836 {
2837 unsigned int hmask, sz;
2838 int dir;
2839
2840 if (net_eq(net, &init_net))
2841 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2842 sizeof(struct xfrm_dst),
2843 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2844 NULL);
2845
2846 hmask = 8 - 1;
2847 sz = (hmask+1) * sizeof(struct hlist_head);
2848
2849 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2850 if (!net->xfrm.policy_byidx)
2851 goto out_byidx;
2852 net->xfrm.policy_idx_hmask = hmask;
2853
2854 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2855 struct xfrm_policy_hash *htab;
2856
2857 net->xfrm.policy_count[dir] = 0;
2858 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2859
2860 htab = &net->xfrm.policy_bydst[dir];
2861 htab->table = xfrm_hash_alloc(sz);
2862 if (!htab->table)
2863 goto out_bydst;
2864 htab->hmask = hmask;
2865 }
2866
2867 INIT_LIST_HEAD(&net->xfrm.policy_all);
2868 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2869 if (net_eq(net, &init_net))
2870 register_netdevice_notifier(&xfrm_dev_notifier);
2871 return 0;
2872
2873 out_bydst:
2874 for (dir--; dir >= 0; dir--) {
2875 struct xfrm_policy_hash *htab;
2876
2877 htab = &net->xfrm.policy_bydst[dir];
2878 xfrm_hash_free(htab->table, sz);
2879 }
2880 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2881 out_byidx:
2882 return -ENOMEM;
2883 }
2884
2885 static void xfrm_policy_fini(struct net *net)
2886 {
2887 unsigned int sz;
2888 int dir;
2889
2890 flush_work(&net->xfrm.policy_hash_work);
2891 #ifdef CONFIG_XFRM_SUB_POLICY
2892 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
2893 #endif
2894 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
2895
2896 WARN_ON(!list_empty(&net->xfrm.policy_all));
2897
2898 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2899 struct xfrm_policy_hash *htab;
2900
2901 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2902
2903 htab = &net->xfrm.policy_bydst[dir];
2904 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
2905 WARN_ON(!hlist_empty(htab->table));
2906 xfrm_hash_free(htab->table, sz);
2907 }
2908
2909 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2910 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2911 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2912 }
2913
2914 static int __net_init xfrm_net_init(struct net *net)
2915 {
2916 int rv;
2917
2918 rv = xfrm_statistics_init(net);
2919 if (rv < 0)
2920 goto out_statistics;
2921 rv = xfrm_state_init(net);
2922 if (rv < 0)
2923 goto out_state;
2924 rv = xfrm_policy_init(net);
2925 if (rv < 0)
2926 goto out_policy;
2927 xfrm_dst_ops_init(net);
2928 rv = xfrm_sysctl_init(net);
2929 if (rv < 0)
2930 goto out_sysctl;
2931 rv = flow_cache_init(net);
2932 if (rv < 0)
2933 goto out;
2934
2935 /* Initialize the per-net locks here */
2936 spin_lock_init(&net->xfrm.xfrm_state_lock);
2937 rwlock_init(&net->xfrm.xfrm_policy_lock);
2938 mutex_init(&net->xfrm.xfrm_cfg_mutex);
2939
2940 return 0;
2941
2942 out:
2943 xfrm_sysctl_fini(net);
2944 out_sysctl:
2945 xfrm_policy_fini(net);
2946 out_policy:
2947 xfrm_state_fini(net);
2948 out_state:
2949 xfrm_statistics_fini(net);
2950 out_statistics:
2951 return rv;
2952 }
2953
2954 static void __net_exit xfrm_net_exit(struct net *net)
2955 {
2956 flow_cache_fini(net);
2957 xfrm_sysctl_fini(net);
2958 xfrm_policy_fini(net);
2959 xfrm_state_fini(net);
2960 xfrm_statistics_fini(net);
2961 }
2962
2963 static struct pernet_operations __net_initdata xfrm_net_ops = {
2964 .init = xfrm_net_init,
2965 .exit = xfrm_net_exit,
2966 };
2967
2968 void __init xfrm_init(void)
2969 {
2970 register_pernet_subsys(&xfrm_net_ops);
2971 xfrm_input_init();
2972 }
2973
2974 #ifdef CONFIG_AUDITSYSCALL
2975 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2976 struct audit_buffer *audit_buf)
2977 {
2978 struct xfrm_sec_ctx *ctx = xp->security;
2979 struct xfrm_selector *sel = &xp->selector;
2980
2981 if (ctx)
2982 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2983 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2984
2985 switch (sel->family) {
2986 case AF_INET:
2987 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2988 if (sel->prefixlen_s != 32)
2989 audit_log_format(audit_buf, " src_prefixlen=%d",
2990 sel->prefixlen_s);
2991 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2992 if (sel->prefixlen_d != 32)
2993 audit_log_format(audit_buf, " dst_prefixlen=%d",
2994 sel->prefixlen_d);
2995 break;
2996 case AF_INET6:
2997 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2998 if (sel->prefixlen_s != 128)
2999 audit_log_format(audit_buf, " src_prefixlen=%d",
3000 sel->prefixlen_s);
3001 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3002 if (sel->prefixlen_d != 128)
3003 audit_log_format(audit_buf, " dst_prefixlen=%d",
3004 sel->prefixlen_d);
3005 break;
3006 }
3007 }
3008
3009 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3010 {
3011 struct audit_buffer *audit_buf;
3012
3013 audit_buf = xfrm_audit_start("SPD-add");
3014 if (audit_buf == NULL)
3015 return;
3016 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3017 audit_log_format(audit_buf, " res=%u", result);
3018 xfrm_audit_common_policyinfo(xp, audit_buf);
3019 audit_log_end(audit_buf);
3020 }
3021 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3022
3023 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3024 bool task_valid)
3025 {
3026 struct audit_buffer *audit_buf;
3027
3028 audit_buf = xfrm_audit_start("SPD-delete");
3029 if (audit_buf == NULL)
3030 return;
3031 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3032 audit_log_format(audit_buf, " res=%u", result);
3033 xfrm_audit_common_policyinfo(xp, audit_buf);
3034 audit_log_end(audit_buf);
3035 }
3036 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3037 #endif
3038
3039 #ifdef CONFIG_XFRM_MIGRATE
3040 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3041 const struct xfrm_selector *sel_tgt)
3042 {
3043 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3044 if (sel_tgt->family == sel_cmp->family &&
3045 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3046 sel_cmp->family) &&
3047 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3048 sel_cmp->family) &&
3049 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3050 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3051 return true;
3052 }
3053 } else {
3054 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3055 return true;
3056 }
3057 }
3058 return false;
3059 }
3060
3061 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3062 u8 dir, u8 type, struct net *net)
3063 {
3064 struct xfrm_policy *pol, *ret = NULL;
3065 struct hlist_head *chain;
3066 u32 priority = ~0U;
3067
3068 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
3069 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3070 hlist_for_each_entry(pol, chain, bydst) {
3071 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3072 pol->type == type) {
3073 ret = pol;
3074 priority = ret->priority;
3075 break;
3076 }
3077 }
3078 chain = &net->xfrm.policy_inexact[dir];
3079 hlist_for_each_entry(pol, chain, bydst) {
3080 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3081 pol->type == type &&
3082 pol->priority < priority) {
3083 ret = pol;
3084 break;
3085 }
3086 }
3087
3088 if (ret)
3089 xfrm_pol_hold(ret);
3090
3091 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
3092
3093 return ret;
3094 }
3095
3096 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3097 {
3098 int match = 0;
3099
3100 if (t->mode == m->mode && t->id.proto == m->proto &&
3101 (m->reqid == 0 || t->reqid == m->reqid)) {
3102 switch (t->mode) {
3103 case XFRM_MODE_TUNNEL:
3104 case XFRM_MODE_BEET:
3105 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3106 m->old_family) &&
3107 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3108 m->old_family)) {
3109 match = 1;
3110 }
3111 break;
3112 case XFRM_MODE_TRANSPORT:
3113 /* in case of transport mode, template does not store
3114 any IP addresses, hence we just compare mode and
3115 protocol */
3116 match = 1;
3117 break;
3118 default:
3119 break;
3120 }
3121 }
3122 return match;
3123 }
3124
3125 /* update endpoint address(es) of template(s) */
3126 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3127 struct xfrm_migrate *m, int num_migrate)
3128 {
3129 struct xfrm_migrate *mp;
3130 int i, j, n = 0;
3131
3132 write_lock_bh(&pol->lock);
3133 if (unlikely(pol->walk.dead)) {
3134 /* target policy has been deleted */
3135 write_unlock_bh(&pol->lock);
3136 return -ENOENT;
3137 }
3138
3139 for (i = 0; i < pol->xfrm_nr; i++) {
3140 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3141 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3142 continue;
3143 n++;
3144 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3145 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3146 continue;
3147 /* update endpoints */
3148 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3149 sizeof(pol->xfrm_vec[i].id.daddr));
3150 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3151 sizeof(pol->xfrm_vec[i].saddr));
3152 pol->xfrm_vec[i].encap_family = mp->new_family;
3153 /* flush bundles */
3154 atomic_inc(&pol->genid);
3155 }
3156 }
3157
3158 write_unlock_bh(&pol->lock);
3159
3160 if (!n)
3161 return -ENODATA;
3162
3163 return 0;
3164 }
3165
3166 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3167 {
3168 int i, j;
3169
3170 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3171 return -EINVAL;
3172
3173 for (i = 0; i < num_migrate; i++) {
3174 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3175 m[i].old_family) &&
3176 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3177 m[i].old_family))
3178 return -EINVAL;
3179 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3180 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3181 return -EINVAL;
3182
3183 /* check if there is any duplicated entry */
3184 for (j = i + 1; j < num_migrate; j++) {
3185 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3186 sizeof(m[i].old_daddr)) &&
3187 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3188 sizeof(m[i].old_saddr)) &&
3189 m[i].proto == m[j].proto &&
3190 m[i].mode == m[j].mode &&
3191 m[i].reqid == m[j].reqid &&
3192 m[i].old_family == m[j].old_family)
3193 return -EINVAL;
3194 }
3195 }
3196
3197 return 0;
3198 }
3199
3200 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3201 struct xfrm_migrate *m, int num_migrate,
3202 struct xfrm_kmaddress *k, struct net *net)
3203 {
3204 int i, err, nx_cur = 0, nx_new = 0;
3205 struct xfrm_policy *pol = NULL;
3206 struct xfrm_state *x, *xc;
3207 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3208 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3209 struct xfrm_migrate *mp;
3210
3211 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3212 goto out;
3213
3214 /* Stage 1 - find policy */
3215 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3216 err = -ENOENT;
3217 goto out;
3218 }
3219
3220 /* Stage 2 - find and update state(s) */
3221 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3222 if ((x = xfrm_migrate_state_find(mp, net))) {
3223 x_cur[nx_cur] = x;
3224 nx_cur++;
3225 if ((xc = xfrm_state_migrate(x, mp))) {
3226 x_new[nx_new] = xc;
3227 nx_new++;
3228 } else {
3229 err = -ENODATA;
3230 goto restore_state;
3231 }
3232 }
3233 }
3234
3235 /* Stage 3 - update policy */
3236 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3237 goto restore_state;
3238
3239 /* Stage 4 - delete old state(s) */
3240 if (nx_cur) {
3241 xfrm_states_put(x_cur, nx_cur);
3242 xfrm_states_delete(x_cur, nx_cur);
3243 }
3244
3245 /* Stage 5 - announce */
3246 km_migrate(sel, dir, type, m, num_migrate, k);
3247
3248 xfrm_pol_put(pol);
3249
3250 return 0;
3251 out:
3252 return err;
3253
3254 restore_state:
3255 if (pol)
3256 xfrm_pol_put(pol);
3257 if (nx_cur)
3258 xfrm_states_put(x_cur, nx_cur);
3259 if (nx_new)
3260 xfrm_states_delete(x_new, nx_new);
3261
3262 return err;
3263 }
3264 EXPORT_SYMBOL(xfrm_migrate);
3265 #endif
Linux kernel - Deliverables
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