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[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_policy.c
1 /*
2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
13 *
14 */
15
16 #include <linux/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 static struct dst_entry *xfrm_policy_sk_bundles;
43
44 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
45 static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
46 __read_mostly;
47
48 static struct kmem_cache *xfrm_dst_cache __read_mostly;
49
50 static void xfrm_init_pmtu(struct dst_entry *dst);
51 static int stale_bundle(struct dst_entry *dst);
52 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
53 static void xfrm_policy_queue_process(unsigned long arg);
54
55 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
56 int dir);
57
58 static inline bool
59 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
60 {
61 const struct flowi4 *fl4 = &fl->u.ip4;
62
63 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
64 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
65 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
66 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
67 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
68 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
69 }
70
71 static inline bool
72 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
73 {
74 const struct flowi6 *fl6 = &fl->u.ip6;
75
76 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
77 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
78 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
79 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
80 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
81 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
82 }
83
84 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
85 unsigned short family)
86 {
87 switch (family) {
88 case AF_INET:
89 return __xfrm4_selector_match(sel, fl);
90 case AF_INET6:
91 return __xfrm6_selector_match(sel, fl);
92 }
93 return false;
94 }
95
96 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
97 {
98 struct xfrm_policy_afinfo *afinfo;
99
100 if (unlikely(family >= NPROTO))
101 return NULL;
102 rcu_read_lock();
103 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
104 if (unlikely(!afinfo))
105 rcu_read_unlock();
106 return afinfo;
107 }
108
109 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
110 {
111 rcu_read_unlock();
112 }
113
114 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
115 const xfrm_address_t *saddr,
116 const xfrm_address_t *daddr,
117 int family)
118 {
119 struct xfrm_policy_afinfo *afinfo;
120 struct dst_entry *dst;
121
122 afinfo = xfrm_policy_get_afinfo(family);
123 if (unlikely(afinfo == NULL))
124 return ERR_PTR(-EAFNOSUPPORT);
125
126 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
127
128 xfrm_policy_put_afinfo(afinfo);
129
130 return dst;
131 }
132
133 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
134 xfrm_address_t *prev_saddr,
135 xfrm_address_t *prev_daddr,
136 int family)
137 {
138 struct net *net = xs_net(x);
139 xfrm_address_t *saddr = &x->props.saddr;
140 xfrm_address_t *daddr = &x->id.daddr;
141 struct dst_entry *dst;
142
143 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
144 saddr = x->coaddr;
145 daddr = prev_daddr;
146 }
147 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
148 saddr = prev_saddr;
149 daddr = x->coaddr;
150 }
151
152 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
153
154 if (!IS_ERR(dst)) {
155 if (prev_saddr != saddr)
156 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
157 if (prev_daddr != daddr)
158 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
159 }
160
161 return dst;
162 }
163
164 static inline unsigned long make_jiffies(long secs)
165 {
166 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
167 return MAX_SCHEDULE_TIMEOUT-1;
168 else
169 return secs*HZ;
170 }
171
172 static void xfrm_policy_timer(unsigned long data)
173 {
174 struct xfrm_policy *xp = (struct xfrm_policy *)data;
175 unsigned long now = get_seconds();
176 long next = LONG_MAX;
177 int warn = 0;
178 int dir;
179
180 read_lock(&xp->lock);
181
182 if (unlikely(xp->walk.dead))
183 goto out;
184
185 dir = xfrm_policy_id2dir(xp->index);
186
187 if (xp->lft.hard_add_expires_seconds) {
188 long tmo = xp->lft.hard_add_expires_seconds +
189 xp->curlft.add_time - now;
190 if (tmo <= 0)
191 goto expired;
192 if (tmo < next)
193 next = tmo;
194 }
195 if (xp->lft.hard_use_expires_seconds) {
196 long tmo = xp->lft.hard_use_expires_seconds +
197 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
198 if (tmo <= 0)
199 goto expired;
200 if (tmo < next)
201 next = tmo;
202 }
203 if (xp->lft.soft_add_expires_seconds) {
204 long tmo = xp->lft.soft_add_expires_seconds +
205 xp->curlft.add_time - now;
206 if (tmo <= 0) {
207 warn = 1;
208 tmo = XFRM_KM_TIMEOUT;
209 }
210 if (tmo < next)
211 next = tmo;
212 }
213 if (xp->lft.soft_use_expires_seconds) {
214 long tmo = xp->lft.soft_use_expires_seconds +
215 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
216 if (tmo <= 0) {
217 warn = 1;
218 tmo = XFRM_KM_TIMEOUT;
219 }
220 if (tmo < next)
221 next = tmo;
222 }
223
224 if (warn)
225 km_policy_expired(xp, dir, 0, 0);
226 if (next != LONG_MAX &&
227 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
228 xfrm_pol_hold(xp);
229
230 out:
231 read_unlock(&xp->lock);
232 xfrm_pol_put(xp);
233 return;
234
235 expired:
236 read_unlock(&xp->lock);
237 if (!xfrm_policy_delete(xp, dir))
238 km_policy_expired(xp, dir, 1, 0);
239 xfrm_pol_put(xp);
240 }
241
242 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
243 {
244 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
245
246 if (unlikely(pol->walk.dead))
247 flo = NULL;
248 else
249 xfrm_pol_hold(pol);
250
251 return flo;
252 }
253
254 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
255 {
256 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
257
258 return !pol->walk.dead;
259 }
260
261 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
262 {
263 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
264 }
265
266 static const struct flow_cache_ops xfrm_policy_fc_ops = {
267 .get = xfrm_policy_flo_get,
268 .check = xfrm_policy_flo_check,
269 .delete = xfrm_policy_flo_delete,
270 };
271
272 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
273 * SPD calls.
274 */
275
276 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
277 {
278 struct xfrm_policy *policy;
279
280 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
281
282 if (policy) {
283 write_pnet(&policy->xp_net, net);
284 INIT_LIST_HEAD(&policy->walk.all);
285 INIT_HLIST_NODE(&policy->bydst);
286 INIT_HLIST_NODE(&policy->byidx);
287 rwlock_init(&policy->lock);
288 atomic_set(&policy->refcnt, 1);
289 skb_queue_head_init(&policy->polq.hold_queue);
290 setup_timer(&policy->timer, xfrm_policy_timer,
291 (unsigned long)policy);
292 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
293 (unsigned long)policy);
294 policy->flo.ops = &xfrm_policy_fc_ops;
295 }
296 return policy;
297 }
298 EXPORT_SYMBOL(xfrm_policy_alloc);
299
300 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
301
302 void xfrm_policy_destroy(struct xfrm_policy *policy)
303 {
304 BUG_ON(!policy->walk.dead);
305
306 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
307 BUG();
308
309 security_xfrm_policy_free(policy->security);
310 kfree(policy);
311 }
312 EXPORT_SYMBOL(xfrm_policy_destroy);
313
314 static void xfrm_queue_purge(struct sk_buff_head *list)
315 {
316 struct sk_buff *skb;
317
318 while ((skb = skb_dequeue(list)) != NULL)
319 kfree_skb(skb);
320 }
321
322 /* Rule must be locked. Release descentant resources, announce
323 * entry dead. The rule must be unlinked from lists to the moment.
324 */
325
326 static void xfrm_policy_kill(struct xfrm_policy *policy)
327 {
328 policy->walk.dead = 1;
329
330 atomic_inc(&policy->genid);
331
332 if (del_timer(&policy->polq.hold_timer))
333 xfrm_pol_put(policy);
334 xfrm_queue_purge(&policy->polq.hold_queue);
335
336 if (del_timer(&policy->timer))
337 xfrm_pol_put(policy);
338
339 xfrm_pol_put(policy);
340 }
341
342 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
343
344 static inline unsigned int idx_hash(struct net *net, u32 index)
345 {
346 return __idx_hash(index, net->xfrm.policy_idx_hmask);
347 }
348
349 static struct hlist_head *policy_hash_bysel(struct net *net,
350 const struct xfrm_selector *sel,
351 unsigned short family, int dir)
352 {
353 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
354 unsigned int hash = __sel_hash(sel, family, hmask);
355
356 return (hash == hmask + 1 ?
357 &net->xfrm.policy_inexact[dir] :
358 net->xfrm.policy_bydst[dir].table + hash);
359 }
360
361 static struct hlist_head *policy_hash_direct(struct net *net,
362 const xfrm_address_t *daddr,
363 const xfrm_address_t *saddr,
364 unsigned short family, int dir)
365 {
366 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
367 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
368
369 return net->xfrm.policy_bydst[dir].table + hash;
370 }
371
372 static void xfrm_dst_hash_transfer(struct hlist_head *list,
373 struct hlist_head *ndsttable,
374 unsigned int nhashmask)
375 {
376 struct hlist_node *tmp, *entry0 = NULL;
377 struct xfrm_policy *pol;
378 unsigned int h0 = 0;
379
380 redo:
381 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
382 unsigned int h;
383
384 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
385 pol->family, nhashmask);
386 if (!entry0) {
387 hlist_del(&pol->bydst);
388 hlist_add_head(&pol->bydst, ndsttable+h);
389 h0 = h;
390 } else {
391 if (h != h0)
392 continue;
393 hlist_del(&pol->bydst);
394 hlist_add_after(entry0, &pol->bydst);
395 }
396 entry0 = &pol->bydst;
397 }
398 if (!hlist_empty(list)) {
399 entry0 = NULL;
400 goto redo;
401 }
402 }
403
404 static void xfrm_idx_hash_transfer(struct hlist_head *list,
405 struct hlist_head *nidxtable,
406 unsigned int nhashmask)
407 {
408 struct hlist_node *tmp;
409 struct xfrm_policy *pol;
410
411 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
412 unsigned int h;
413
414 h = __idx_hash(pol->index, nhashmask);
415 hlist_add_head(&pol->byidx, nidxtable+h);
416 }
417 }
418
419 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
420 {
421 return ((old_hmask + 1) << 1) - 1;
422 }
423
424 static void xfrm_bydst_resize(struct net *net, int dir)
425 {
426 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
427 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
428 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
429 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
430 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
431 int i;
432
433 if (!ndst)
434 return;
435
436 write_lock_bh(&net->xfrm.xfrm_policy_lock);
437
438 for (i = hmask; i >= 0; i--)
439 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
440
441 net->xfrm.policy_bydst[dir].table = ndst;
442 net->xfrm.policy_bydst[dir].hmask = nhashmask;
443
444 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
445
446 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
447 }
448
449 static void xfrm_byidx_resize(struct net *net, int total)
450 {
451 unsigned int hmask = net->xfrm.policy_idx_hmask;
452 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
453 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
454 struct hlist_head *oidx = net->xfrm.policy_byidx;
455 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
456 int i;
457
458 if (!nidx)
459 return;
460
461 write_lock_bh(&net->xfrm.xfrm_policy_lock);
462
463 for (i = hmask; i >= 0; i--)
464 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
465
466 net->xfrm.policy_byidx = nidx;
467 net->xfrm.policy_idx_hmask = nhashmask;
468
469 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
470
471 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
472 }
473
474 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
475 {
476 unsigned int cnt = net->xfrm.policy_count[dir];
477 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
478
479 if (total)
480 *total += cnt;
481
482 if ((hmask + 1) < xfrm_policy_hashmax &&
483 cnt > hmask)
484 return 1;
485
486 return 0;
487 }
488
489 static inline int xfrm_byidx_should_resize(struct net *net, int total)
490 {
491 unsigned int hmask = net->xfrm.policy_idx_hmask;
492
493 if ((hmask + 1) < xfrm_policy_hashmax &&
494 total > hmask)
495 return 1;
496
497 return 0;
498 }
499
500 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
501 {
502 read_lock_bh(&net->xfrm.xfrm_policy_lock);
503 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
504 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
505 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
506 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
507 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
508 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
509 si->spdhcnt = net->xfrm.policy_idx_hmask;
510 si->spdhmcnt = xfrm_policy_hashmax;
511 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
512 }
513 EXPORT_SYMBOL(xfrm_spd_getinfo);
514
515 static DEFINE_MUTEX(hash_resize_mutex);
516 static void xfrm_hash_resize(struct work_struct *work)
517 {
518 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
519 int dir, total;
520
521 mutex_lock(&hash_resize_mutex);
522
523 total = 0;
524 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
525 if (xfrm_bydst_should_resize(net, dir, &total))
526 xfrm_bydst_resize(net, dir);
527 }
528 if (xfrm_byidx_should_resize(net, total))
529 xfrm_byidx_resize(net, total);
530
531 mutex_unlock(&hash_resize_mutex);
532 }
533
534 /* Generate new index... KAME seems to generate them ordered by cost
535 * of an absolute inpredictability of ordering of rules. This will not pass. */
536 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
537 {
538 static u32 idx_generator;
539
540 for (;;) {
541 struct hlist_head *list;
542 struct xfrm_policy *p;
543 u32 idx;
544 int found;
545
546 if (!index) {
547 idx = (idx_generator | dir);
548 idx_generator += 8;
549 } else {
550 idx = index;
551 index = 0;
552 }
553
554 if (idx == 0)
555 idx = 8;
556 list = net->xfrm.policy_byidx + idx_hash(net, idx);
557 found = 0;
558 hlist_for_each_entry(p, list, byidx) {
559 if (p->index == idx) {
560 found = 1;
561 break;
562 }
563 }
564 if (!found)
565 return idx;
566 }
567 }
568
569 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
570 {
571 u32 *p1 = (u32 *) s1;
572 u32 *p2 = (u32 *) s2;
573 int len = sizeof(struct xfrm_selector) / sizeof(u32);
574 int i;
575
576 for (i = 0; i < len; i++) {
577 if (p1[i] != p2[i])
578 return 1;
579 }
580
581 return 0;
582 }
583
584 static void xfrm_policy_requeue(struct xfrm_policy *old,
585 struct xfrm_policy *new)
586 {
587 struct xfrm_policy_queue *pq = &old->polq;
588 struct sk_buff_head list;
589
590 __skb_queue_head_init(&list);
591
592 spin_lock_bh(&pq->hold_queue.lock);
593 skb_queue_splice_init(&pq->hold_queue, &list);
594 if (del_timer(&pq->hold_timer))
595 xfrm_pol_put(old);
596 spin_unlock_bh(&pq->hold_queue.lock);
597
598 if (skb_queue_empty(&list))
599 return;
600
601 pq = &new->polq;
602
603 spin_lock_bh(&pq->hold_queue.lock);
604 skb_queue_splice(&list, &pq->hold_queue);
605 pq->timeout = XFRM_QUEUE_TMO_MIN;
606 if (!mod_timer(&pq->hold_timer, jiffies))
607 xfrm_pol_hold(new);
608 spin_unlock_bh(&pq->hold_queue.lock);
609 }
610
611 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
612 struct xfrm_policy *pol)
613 {
614 u32 mark = policy->mark.v & policy->mark.m;
615
616 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
617 return true;
618
619 if ((mark & pol->mark.m) == pol->mark.v &&
620 policy->priority == pol->priority)
621 return true;
622
623 return false;
624 }
625
626 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
627 {
628 struct net *net = xp_net(policy);
629 struct xfrm_policy *pol;
630 struct xfrm_policy *delpol;
631 struct hlist_head *chain;
632 struct hlist_node *newpos;
633
634 write_lock_bh(&net->xfrm.xfrm_policy_lock);
635 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
636 delpol = NULL;
637 newpos = NULL;
638 hlist_for_each_entry(pol, chain, bydst) {
639 if (pol->type == policy->type &&
640 !selector_cmp(&pol->selector, &policy->selector) &&
641 xfrm_policy_mark_match(policy, pol) &&
642 xfrm_sec_ctx_match(pol->security, policy->security) &&
643 !WARN_ON(delpol)) {
644 if (excl) {
645 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
646 return -EEXIST;
647 }
648 delpol = pol;
649 if (policy->priority > pol->priority)
650 continue;
651 } else if (policy->priority >= pol->priority) {
652 newpos = &pol->bydst;
653 continue;
654 }
655 if (delpol)
656 break;
657 }
658 if (newpos)
659 hlist_add_after(newpos, &policy->bydst);
660 else
661 hlist_add_head(&policy->bydst, chain);
662 xfrm_pol_hold(policy);
663 net->xfrm.policy_count[dir]++;
664 atomic_inc(&flow_cache_genid);
665
666 /* After previous checking, family can either be AF_INET or AF_INET6 */
667 if (policy->family == AF_INET)
668 rt_genid_bump_ipv4(net);
669 else
670 rt_genid_bump_ipv6(net);
671
672 if (delpol) {
673 xfrm_policy_requeue(delpol, policy);
674 __xfrm_policy_unlink(delpol, dir);
675 }
676 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
677 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
678 policy->curlft.add_time = get_seconds();
679 policy->curlft.use_time = 0;
680 if (!mod_timer(&policy->timer, jiffies + HZ))
681 xfrm_pol_hold(policy);
682 list_add(&policy->walk.all, &net->xfrm.policy_all);
683 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
684
685 if (delpol)
686 xfrm_policy_kill(delpol);
687 else if (xfrm_bydst_should_resize(net, dir, NULL))
688 schedule_work(&net->xfrm.policy_hash_work);
689
690 return 0;
691 }
692 EXPORT_SYMBOL(xfrm_policy_insert);
693
694 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
695 int dir, struct xfrm_selector *sel,
696 struct xfrm_sec_ctx *ctx, int delete,
697 int *err)
698 {
699 struct xfrm_policy *pol, *ret;
700 struct hlist_head *chain;
701
702 *err = 0;
703 write_lock_bh(&net->xfrm.xfrm_policy_lock);
704 chain = policy_hash_bysel(net, sel, sel->family, dir);
705 ret = NULL;
706 hlist_for_each_entry(pol, chain, bydst) {
707 if (pol->type == type &&
708 (mark & pol->mark.m) == pol->mark.v &&
709 !selector_cmp(sel, &pol->selector) &&
710 xfrm_sec_ctx_match(ctx, pol->security)) {
711 xfrm_pol_hold(pol);
712 if (delete) {
713 *err = security_xfrm_policy_delete(
714 pol->security);
715 if (*err) {
716 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
717 return pol;
718 }
719 __xfrm_policy_unlink(pol, dir);
720 }
721 ret = pol;
722 break;
723 }
724 }
725 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
726
727 if (ret && delete)
728 xfrm_policy_kill(ret);
729 return ret;
730 }
731 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
732
733 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
734 int dir, u32 id, int delete, int *err)
735 {
736 struct xfrm_policy *pol, *ret;
737 struct hlist_head *chain;
738
739 *err = -ENOENT;
740 if (xfrm_policy_id2dir(id) != dir)
741 return NULL;
742
743 *err = 0;
744 write_lock_bh(&net->xfrm.xfrm_policy_lock);
745 chain = net->xfrm.policy_byidx + idx_hash(net, id);
746 ret = NULL;
747 hlist_for_each_entry(pol, chain, byidx) {
748 if (pol->type == type && pol->index == id &&
749 (mark & pol->mark.m) == pol->mark.v) {
750 xfrm_pol_hold(pol);
751 if (delete) {
752 *err = security_xfrm_policy_delete(
753 pol->security);
754 if (*err) {
755 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
756 return pol;
757 }
758 __xfrm_policy_unlink(pol, dir);
759 }
760 ret = pol;
761 break;
762 }
763 }
764 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
765
766 if (ret && delete)
767 xfrm_policy_kill(ret);
768 return ret;
769 }
770 EXPORT_SYMBOL(xfrm_policy_byid);
771
772 #ifdef CONFIG_SECURITY_NETWORK_XFRM
773 static inline int
774 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
775 {
776 int dir, err = 0;
777
778 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
779 struct xfrm_policy *pol;
780 int i;
781
782 hlist_for_each_entry(pol,
783 &net->xfrm.policy_inexact[dir], bydst) {
784 if (pol->type != type)
785 continue;
786 err = security_xfrm_policy_delete(pol->security);
787 if (err) {
788 xfrm_audit_policy_delete(pol, 0,
789 audit_info->loginuid,
790 audit_info->sessionid,
791 audit_info->secid);
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 audit_info->loginuid,
806 audit_info->sessionid,
807 audit_info->secid);
808 return err;
809 }
810 }
811 }
812 }
813 return err;
814 }
815 #else
816 static inline int
817 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
818 {
819 return 0;
820 }
821 #endif
822
823 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
824 {
825 int dir, err = 0, cnt = 0;
826
827 write_lock_bh(&net->xfrm.xfrm_policy_lock);
828
829 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
830 if (err)
831 goto out;
832
833 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
834 struct xfrm_policy *pol;
835 int i;
836
837 again1:
838 hlist_for_each_entry(pol,
839 &net->xfrm.policy_inexact[dir], bydst) {
840 if (pol->type != type)
841 continue;
842 __xfrm_policy_unlink(pol, dir);
843 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
844 cnt++;
845
846 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
847 audit_info->sessionid,
848 audit_info->secid);
849
850 xfrm_policy_kill(pol);
851
852 write_lock_bh(&net->xfrm.xfrm_policy_lock);
853 goto again1;
854 }
855
856 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
857 again2:
858 hlist_for_each_entry(pol,
859 net->xfrm.policy_bydst[dir].table + i,
860 bydst) {
861 if (pol->type != type)
862 continue;
863 __xfrm_policy_unlink(pol, dir);
864 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
865 cnt++;
866
867 xfrm_audit_policy_delete(pol, 1,
868 audit_info->loginuid,
869 audit_info->sessionid,
870 audit_info->secid);
871 xfrm_policy_kill(pol);
872
873 write_lock_bh(&net->xfrm.xfrm_policy_lock);
874 goto again2;
875 }
876 }
877
878 }
879 if (!cnt)
880 err = -ESRCH;
881 out:
882 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
883 return err;
884 }
885 EXPORT_SYMBOL(xfrm_policy_flush);
886
887 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
888 int (*func)(struct xfrm_policy *, int, int, void*),
889 void *data)
890 {
891 struct xfrm_policy *pol;
892 struct xfrm_policy_walk_entry *x;
893 int error = 0;
894
895 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
896 walk->type != XFRM_POLICY_TYPE_ANY)
897 return -EINVAL;
898
899 if (list_empty(&walk->walk.all) && walk->seq != 0)
900 return 0;
901
902 write_lock_bh(&net->xfrm.xfrm_policy_lock);
903 if (list_empty(&walk->walk.all))
904 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
905 else
906 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
907 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
908 if (x->dead)
909 continue;
910 pol = container_of(x, struct xfrm_policy, walk);
911 if (walk->type != XFRM_POLICY_TYPE_ANY &&
912 walk->type != pol->type)
913 continue;
914 error = func(pol, xfrm_policy_id2dir(pol->index),
915 walk->seq, data);
916 if (error) {
917 list_move_tail(&walk->walk.all, &x->all);
918 goto out;
919 }
920 walk->seq++;
921 }
922 if (walk->seq == 0) {
923 error = -ENOENT;
924 goto out;
925 }
926 list_del_init(&walk->walk.all);
927 out:
928 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
929 return error;
930 }
931 EXPORT_SYMBOL(xfrm_policy_walk);
932
933 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
934 {
935 INIT_LIST_HEAD(&walk->walk.all);
936 walk->walk.dead = 1;
937 walk->type = type;
938 walk->seq = 0;
939 }
940 EXPORT_SYMBOL(xfrm_policy_walk_init);
941
942 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
943 {
944 if (list_empty(&walk->walk.all))
945 return;
946
947 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
948 list_del(&walk->walk.all);
949 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
950 }
951 EXPORT_SYMBOL(xfrm_policy_walk_done);
952
953 /*
954 * Find policy to apply to this flow.
955 *
956 * Returns 0 if policy found, else an -errno.
957 */
958 static int xfrm_policy_match(const struct xfrm_policy *pol,
959 const struct flowi *fl,
960 u8 type, u16 family, int dir)
961 {
962 const struct xfrm_selector *sel = &pol->selector;
963 int ret = -ESRCH;
964 bool match;
965
966 if (pol->family != family ||
967 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
968 pol->type != type)
969 return ret;
970
971 match = xfrm_selector_match(sel, fl, family);
972 if (match)
973 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
974 dir);
975
976 return ret;
977 }
978
979 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
980 const struct flowi *fl,
981 u16 family, u8 dir)
982 {
983 int err;
984 struct xfrm_policy *pol, *ret;
985 const xfrm_address_t *daddr, *saddr;
986 struct hlist_head *chain;
987 u32 priority = ~0U;
988
989 daddr = xfrm_flowi_daddr(fl, family);
990 saddr = xfrm_flowi_saddr(fl, family);
991 if (unlikely(!daddr || !saddr))
992 return NULL;
993
994 read_lock_bh(&net->xfrm.xfrm_policy_lock);
995 chain = policy_hash_direct(net, daddr, saddr, family, dir);
996 ret = NULL;
997 hlist_for_each_entry(pol, chain, bydst) {
998 err = xfrm_policy_match(pol, fl, type, family, dir);
999 if (err) {
1000 if (err == -ESRCH)
1001 continue;
1002 else {
1003 ret = ERR_PTR(err);
1004 goto fail;
1005 }
1006 } else {
1007 ret = pol;
1008 priority = ret->priority;
1009 break;
1010 }
1011 }
1012 chain = &net->xfrm.policy_inexact[dir];
1013 hlist_for_each_entry(pol, chain, bydst) {
1014 err = xfrm_policy_match(pol, fl, type, family, dir);
1015 if (err) {
1016 if (err == -ESRCH)
1017 continue;
1018 else {
1019 ret = ERR_PTR(err);
1020 goto fail;
1021 }
1022 } else if (pol->priority < priority) {
1023 ret = pol;
1024 break;
1025 }
1026 }
1027 if (ret)
1028 xfrm_pol_hold(ret);
1029 fail:
1030 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1031
1032 return ret;
1033 }
1034
1035 static struct xfrm_policy *
1036 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1037 {
1038 #ifdef CONFIG_XFRM_SUB_POLICY
1039 struct xfrm_policy *pol;
1040
1041 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1042 if (pol != NULL)
1043 return pol;
1044 #endif
1045 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1046 }
1047
1048 static int flow_to_policy_dir(int dir)
1049 {
1050 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1051 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1052 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1053 return dir;
1054
1055 switch (dir) {
1056 default:
1057 case FLOW_DIR_IN:
1058 return XFRM_POLICY_IN;
1059 case FLOW_DIR_OUT:
1060 return XFRM_POLICY_OUT;
1061 case FLOW_DIR_FWD:
1062 return XFRM_POLICY_FWD;
1063 }
1064 }
1065
1066 static struct flow_cache_object *
1067 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1068 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1069 {
1070 struct xfrm_policy *pol;
1071
1072 if (old_obj)
1073 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1074
1075 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1076 if (IS_ERR_OR_NULL(pol))
1077 return ERR_CAST(pol);
1078
1079 /* Resolver returns two references:
1080 * one for cache and one for caller of flow_cache_lookup() */
1081 xfrm_pol_hold(pol);
1082
1083 return &pol->flo;
1084 }
1085
1086 static inline int policy_to_flow_dir(int dir)
1087 {
1088 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1089 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1090 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1091 return dir;
1092 switch (dir) {
1093 default:
1094 case XFRM_POLICY_IN:
1095 return FLOW_DIR_IN;
1096 case XFRM_POLICY_OUT:
1097 return FLOW_DIR_OUT;
1098 case XFRM_POLICY_FWD:
1099 return FLOW_DIR_FWD;
1100 }
1101 }
1102
1103 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1104 const struct flowi *fl)
1105 {
1106 struct xfrm_policy *pol;
1107 struct net *net = sock_net(sk);
1108
1109 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1110 if ((pol = sk->sk_policy[dir]) != NULL) {
1111 bool match = xfrm_selector_match(&pol->selector, fl,
1112 sk->sk_family);
1113 int err = 0;
1114
1115 if (match) {
1116 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1117 pol = NULL;
1118 goto out;
1119 }
1120 err = security_xfrm_policy_lookup(pol->security,
1121 fl->flowi_secid,
1122 policy_to_flow_dir(dir));
1123 if (!err)
1124 xfrm_pol_hold(pol);
1125 else if (err == -ESRCH)
1126 pol = NULL;
1127 else
1128 pol = ERR_PTR(err);
1129 } else
1130 pol = NULL;
1131 }
1132 out:
1133 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1134 return pol;
1135 }
1136
1137 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1138 {
1139 struct net *net = xp_net(pol);
1140 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1141 pol->family, dir);
1142
1143 list_add(&pol->walk.all, &net->xfrm.policy_all);
1144 hlist_add_head(&pol->bydst, chain);
1145 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1146 net->xfrm.policy_count[dir]++;
1147 xfrm_pol_hold(pol);
1148
1149 if (xfrm_bydst_should_resize(net, dir, NULL))
1150 schedule_work(&net->xfrm.policy_hash_work);
1151 }
1152
1153 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1154 int dir)
1155 {
1156 struct net *net = xp_net(pol);
1157
1158 if (hlist_unhashed(&pol->bydst))
1159 return NULL;
1160
1161 hlist_del(&pol->bydst);
1162 hlist_del(&pol->byidx);
1163 list_del(&pol->walk.all);
1164 net->xfrm.policy_count[dir]--;
1165
1166 return pol;
1167 }
1168
1169 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1170 {
1171 struct net *net = xp_net(pol);
1172
1173 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1174 pol = __xfrm_policy_unlink(pol, dir);
1175 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1176 if (pol) {
1177 xfrm_policy_kill(pol);
1178 return 0;
1179 }
1180 return -ENOENT;
1181 }
1182 EXPORT_SYMBOL(xfrm_policy_delete);
1183
1184 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1185 {
1186 struct net *net = xp_net(pol);
1187 struct xfrm_policy *old_pol;
1188
1189 #ifdef CONFIG_XFRM_SUB_POLICY
1190 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1191 return -EINVAL;
1192 #endif
1193
1194 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1195 old_pol = sk->sk_policy[dir];
1196 sk->sk_policy[dir] = pol;
1197 if (pol) {
1198 pol->curlft.add_time = get_seconds();
1199 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1200 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1201 }
1202 if (old_pol) {
1203 if (pol)
1204 xfrm_policy_requeue(old_pol, pol);
1205
1206 /* Unlinking succeeds always. This is the only function
1207 * allowed to delete or replace socket policy.
1208 */
1209 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1210 }
1211 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1212
1213 if (old_pol) {
1214 xfrm_policy_kill(old_pol);
1215 }
1216 return 0;
1217 }
1218
1219 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1220 {
1221 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1222 struct net *net = xp_net(old);
1223
1224 if (newp) {
1225 newp->selector = old->selector;
1226 if (security_xfrm_policy_clone(old->security,
1227 &newp->security)) {
1228 kfree(newp);
1229 return NULL; /* ENOMEM */
1230 }
1231 newp->lft = old->lft;
1232 newp->curlft = old->curlft;
1233 newp->mark = old->mark;
1234 newp->action = old->action;
1235 newp->flags = old->flags;
1236 newp->xfrm_nr = old->xfrm_nr;
1237 newp->index = old->index;
1238 newp->type = old->type;
1239 memcpy(newp->xfrm_vec, old->xfrm_vec,
1240 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1241 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1242 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1243 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1244 xfrm_pol_put(newp);
1245 }
1246 return newp;
1247 }
1248
1249 int __xfrm_sk_clone_policy(struct sock *sk)
1250 {
1251 struct xfrm_policy *p0 = sk->sk_policy[0],
1252 *p1 = sk->sk_policy[1];
1253
1254 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1255 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1256 return -ENOMEM;
1257 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1258 return -ENOMEM;
1259 return 0;
1260 }
1261
1262 static int
1263 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1264 unsigned short family)
1265 {
1266 int err;
1267 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1268
1269 if (unlikely(afinfo == NULL))
1270 return -EINVAL;
1271 err = afinfo->get_saddr(net, local, remote);
1272 xfrm_policy_put_afinfo(afinfo);
1273 return err;
1274 }
1275
1276 /* Resolve list of templates for the flow, given policy. */
1277
1278 static int
1279 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1280 struct xfrm_state **xfrm, unsigned short family)
1281 {
1282 struct net *net = xp_net(policy);
1283 int nx;
1284 int i, error;
1285 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1286 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1287 xfrm_address_t tmp;
1288
1289 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1290 struct xfrm_state *x;
1291 xfrm_address_t *remote = daddr;
1292 xfrm_address_t *local = saddr;
1293 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1294
1295 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1296 tmpl->mode == XFRM_MODE_BEET) {
1297 remote = &tmpl->id.daddr;
1298 local = &tmpl->saddr;
1299 if (xfrm_addr_any(local, tmpl->encap_family)) {
1300 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1301 if (error)
1302 goto fail;
1303 local = &tmp;
1304 }
1305 }
1306
1307 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1308
1309 if (x && x->km.state == XFRM_STATE_VALID) {
1310 xfrm[nx++] = x;
1311 daddr = remote;
1312 saddr = local;
1313 continue;
1314 }
1315 if (x) {
1316 error = (x->km.state == XFRM_STATE_ERROR ?
1317 -EINVAL : -EAGAIN);
1318 xfrm_state_put(x);
1319 } else if (error == -ESRCH) {
1320 error = -EAGAIN;
1321 }
1322
1323 if (!tmpl->optional)
1324 goto fail;
1325 }
1326 return nx;
1327
1328 fail:
1329 for (nx--; nx >= 0; nx--)
1330 xfrm_state_put(xfrm[nx]);
1331 return error;
1332 }
1333
1334 static int
1335 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1336 struct xfrm_state **xfrm, unsigned short family)
1337 {
1338 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1339 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1340 int cnx = 0;
1341 int error;
1342 int ret;
1343 int i;
1344
1345 for (i = 0; i < npols; i++) {
1346 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1347 error = -ENOBUFS;
1348 goto fail;
1349 }
1350
1351 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1352 if (ret < 0) {
1353 error = ret;
1354 goto fail;
1355 } else
1356 cnx += ret;
1357 }
1358
1359 /* found states are sorted for outbound processing */
1360 if (npols > 1)
1361 xfrm_state_sort(xfrm, tpp, cnx, family);
1362
1363 return cnx;
1364
1365 fail:
1366 for (cnx--; cnx >= 0; cnx--)
1367 xfrm_state_put(tpp[cnx]);
1368 return error;
1369
1370 }
1371
1372 /* Check that the bundle accepts the flow and its components are
1373 * still valid.
1374 */
1375
1376 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1377 {
1378 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1379 int tos;
1380
1381 if (!afinfo)
1382 return -EINVAL;
1383
1384 tos = afinfo->get_tos(fl);
1385
1386 xfrm_policy_put_afinfo(afinfo);
1387
1388 return tos;
1389 }
1390
1391 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1392 {
1393 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1394 struct dst_entry *dst = &xdst->u.dst;
1395
1396 if (xdst->route == NULL) {
1397 /* Dummy bundle - if it has xfrms we were not
1398 * able to build bundle as template resolution failed.
1399 * It means we need to try again resolving. */
1400 if (xdst->num_xfrms > 0)
1401 return NULL;
1402 } else if (dst->flags & DST_XFRM_QUEUE) {
1403 return NULL;
1404 } else {
1405 /* Real bundle */
1406 if (stale_bundle(dst))
1407 return NULL;
1408 }
1409
1410 dst_hold(dst);
1411 return flo;
1412 }
1413
1414 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1415 {
1416 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1417 struct dst_entry *dst = &xdst->u.dst;
1418
1419 if (!xdst->route)
1420 return 0;
1421 if (stale_bundle(dst))
1422 return 0;
1423
1424 return 1;
1425 }
1426
1427 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1428 {
1429 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1430 struct dst_entry *dst = &xdst->u.dst;
1431
1432 dst_free(dst);
1433 }
1434
1435 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1436 .get = xfrm_bundle_flo_get,
1437 .check = xfrm_bundle_flo_check,
1438 .delete = xfrm_bundle_flo_delete,
1439 };
1440
1441 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1442 {
1443 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1444 struct dst_ops *dst_ops;
1445 struct xfrm_dst *xdst;
1446
1447 if (!afinfo)
1448 return ERR_PTR(-EINVAL);
1449
1450 switch (family) {
1451 case AF_INET:
1452 dst_ops = &net->xfrm.xfrm4_dst_ops;
1453 break;
1454 #if IS_ENABLED(CONFIG_IPV6)
1455 case AF_INET6:
1456 dst_ops = &net->xfrm.xfrm6_dst_ops;
1457 break;
1458 #endif
1459 default:
1460 BUG();
1461 }
1462 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1463
1464 if (likely(xdst)) {
1465 struct dst_entry *dst = &xdst->u.dst;
1466
1467 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1468 xdst->flo.ops = &xfrm_bundle_fc_ops;
1469 if (afinfo->init_dst)
1470 afinfo->init_dst(net, xdst);
1471 } else
1472 xdst = ERR_PTR(-ENOBUFS);
1473
1474 xfrm_policy_put_afinfo(afinfo);
1475
1476 return xdst;
1477 }
1478
1479 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1480 int nfheader_len)
1481 {
1482 struct xfrm_policy_afinfo *afinfo =
1483 xfrm_policy_get_afinfo(dst->ops->family);
1484 int err;
1485
1486 if (!afinfo)
1487 return -EINVAL;
1488
1489 err = afinfo->init_path(path, dst, nfheader_len);
1490
1491 xfrm_policy_put_afinfo(afinfo);
1492
1493 return err;
1494 }
1495
1496 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1497 const struct flowi *fl)
1498 {
1499 struct xfrm_policy_afinfo *afinfo =
1500 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1501 int err;
1502
1503 if (!afinfo)
1504 return -EINVAL;
1505
1506 err = afinfo->fill_dst(xdst, dev, fl);
1507
1508 xfrm_policy_put_afinfo(afinfo);
1509
1510 return err;
1511 }
1512
1513
1514 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1515 * all the metrics... Shortly, bundle a bundle.
1516 */
1517
1518 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1519 struct xfrm_state **xfrm, int nx,
1520 const struct flowi *fl,
1521 struct dst_entry *dst)
1522 {
1523 struct net *net = xp_net(policy);
1524 unsigned long now = jiffies;
1525 struct net_device *dev;
1526 struct xfrm_mode *inner_mode;
1527 struct dst_entry *dst_prev = NULL;
1528 struct dst_entry *dst0 = NULL;
1529 int i = 0;
1530 int err;
1531 int header_len = 0;
1532 int nfheader_len = 0;
1533 int trailer_len = 0;
1534 int tos;
1535 int family = policy->selector.family;
1536 xfrm_address_t saddr, daddr;
1537
1538 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1539
1540 tos = xfrm_get_tos(fl, family);
1541 err = tos;
1542 if (tos < 0)
1543 goto put_states;
1544
1545 dst_hold(dst);
1546
1547 for (; i < nx; i++) {
1548 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1549 struct dst_entry *dst1 = &xdst->u.dst;
1550
1551 err = PTR_ERR(xdst);
1552 if (IS_ERR(xdst)) {
1553 dst_release(dst);
1554 goto put_states;
1555 }
1556
1557 if (xfrm[i]->sel.family == AF_UNSPEC) {
1558 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1559 xfrm_af2proto(family));
1560 if (!inner_mode) {
1561 err = -EAFNOSUPPORT;
1562 dst_release(dst);
1563 goto put_states;
1564 }
1565 } else
1566 inner_mode = xfrm[i]->inner_mode;
1567
1568 if (!dst_prev)
1569 dst0 = dst1;
1570 else {
1571 dst_prev->child = dst_clone(dst1);
1572 dst1->flags |= DST_NOHASH;
1573 }
1574
1575 xdst->route = dst;
1576 dst_copy_metrics(dst1, dst);
1577
1578 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1579 family = xfrm[i]->props.family;
1580 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1581 family);
1582 err = PTR_ERR(dst);
1583 if (IS_ERR(dst))
1584 goto put_states;
1585 } else
1586 dst_hold(dst);
1587
1588 dst1->xfrm = xfrm[i];
1589 xdst->xfrm_genid = xfrm[i]->genid;
1590
1591 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1592 dst1->flags |= DST_HOST;
1593 dst1->lastuse = now;
1594
1595 dst1->input = dst_discard;
1596 dst1->output = inner_mode->afinfo->output;
1597
1598 dst1->next = dst_prev;
1599 dst_prev = dst1;
1600
1601 header_len += xfrm[i]->props.header_len;
1602 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1603 nfheader_len += xfrm[i]->props.header_len;
1604 trailer_len += xfrm[i]->props.trailer_len;
1605 }
1606
1607 dst_prev->child = dst;
1608 dst0->path = dst;
1609
1610 err = -ENODEV;
1611 dev = dst->dev;
1612 if (!dev)
1613 goto free_dst;
1614
1615 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1616 xfrm_init_pmtu(dst_prev);
1617
1618 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1619 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1620
1621 err = xfrm_fill_dst(xdst, dev, fl);
1622 if (err)
1623 goto free_dst;
1624
1625 dst_prev->header_len = header_len;
1626 dst_prev->trailer_len = trailer_len;
1627 header_len -= xdst->u.dst.xfrm->props.header_len;
1628 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1629 }
1630
1631 out:
1632 return dst0;
1633
1634 put_states:
1635 for (; i < nx; i++)
1636 xfrm_state_put(xfrm[i]);
1637 free_dst:
1638 if (dst0)
1639 dst_free(dst0);
1640 dst0 = ERR_PTR(err);
1641 goto out;
1642 }
1643
1644 #ifdef CONFIG_XFRM_SUB_POLICY
1645 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1646 {
1647 if (!*target) {
1648 *target = kmalloc(size, GFP_ATOMIC);
1649 if (!*target)
1650 return -ENOMEM;
1651 }
1652
1653 memcpy(*target, src, size);
1654 return 0;
1655 }
1656 #endif
1657
1658 static int xfrm_dst_update_parent(struct dst_entry *dst,
1659 const struct xfrm_selector *sel)
1660 {
1661 #ifdef CONFIG_XFRM_SUB_POLICY
1662 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1663 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1664 sel, sizeof(*sel));
1665 #else
1666 return 0;
1667 #endif
1668 }
1669
1670 static int xfrm_dst_update_origin(struct dst_entry *dst,
1671 const struct flowi *fl)
1672 {
1673 #ifdef CONFIG_XFRM_SUB_POLICY
1674 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1675 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1676 #else
1677 return 0;
1678 #endif
1679 }
1680
1681 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1682 struct xfrm_policy **pols,
1683 int *num_pols, int *num_xfrms)
1684 {
1685 int i;
1686
1687 if (*num_pols == 0 || !pols[0]) {
1688 *num_pols = 0;
1689 *num_xfrms = 0;
1690 return 0;
1691 }
1692 if (IS_ERR(pols[0]))
1693 return PTR_ERR(pols[0]);
1694
1695 *num_xfrms = pols[0]->xfrm_nr;
1696
1697 #ifdef CONFIG_XFRM_SUB_POLICY
1698 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1699 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1700 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1701 XFRM_POLICY_TYPE_MAIN,
1702 fl, family,
1703 XFRM_POLICY_OUT);
1704 if (pols[1]) {
1705 if (IS_ERR(pols[1])) {
1706 xfrm_pols_put(pols, *num_pols);
1707 return PTR_ERR(pols[1]);
1708 }
1709 (*num_pols)++;
1710 (*num_xfrms) += pols[1]->xfrm_nr;
1711 }
1712 }
1713 #endif
1714 for (i = 0; i < *num_pols; i++) {
1715 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1716 *num_xfrms = -1;
1717 break;
1718 }
1719 }
1720
1721 return 0;
1722
1723 }
1724
1725 static struct xfrm_dst *
1726 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1727 const struct flowi *fl, u16 family,
1728 struct dst_entry *dst_orig)
1729 {
1730 struct net *net = xp_net(pols[0]);
1731 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1732 struct dst_entry *dst;
1733 struct xfrm_dst *xdst;
1734 int err;
1735
1736 /* Try to instantiate a bundle */
1737 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1738 if (err <= 0) {
1739 if (err != 0 && err != -EAGAIN)
1740 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1741 return ERR_PTR(err);
1742 }
1743
1744 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1745 if (IS_ERR(dst)) {
1746 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1747 return ERR_CAST(dst);
1748 }
1749
1750 xdst = (struct xfrm_dst *)dst;
1751 xdst->num_xfrms = err;
1752 if (num_pols > 1)
1753 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1754 else
1755 err = xfrm_dst_update_origin(dst, fl);
1756 if (unlikely(err)) {
1757 dst_free(dst);
1758 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1759 return ERR_PTR(err);
1760 }
1761
1762 xdst->num_pols = num_pols;
1763 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1764 xdst->policy_genid = atomic_read(&pols[0]->genid);
1765
1766 return xdst;
1767 }
1768
1769 static void xfrm_policy_queue_process(unsigned long arg)
1770 {
1771 int err = 0;
1772 struct sk_buff *skb;
1773 struct sock *sk;
1774 struct dst_entry *dst;
1775 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1776 struct xfrm_policy_queue *pq = &pol->polq;
1777 struct flowi fl;
1778 struct sk_buff_head list;
1779
1780 spin_lock(&pq->hold_queue.lock);
1781 skb = skb_peek(&pq->hold_queue);
1782 if (!skb) {
1783 spin_unlock(&pq->hold_queue.lock);
1784 goto out;
1785 }
1786 dst = skb_dst(skb);
1787 sk = skb->sk;
1788 xfrm_decode_session(skb, &fl, dst->ops->family);
1789 spin_unlock(&pq->hold_queue.lock);
1790
1791 dst_hold(dst->path);
1792 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1793 sk, 0);
1794 if (IS_ERR(dst))
1795 goto purge_queue;
1796
1797 if (dst->flags & DST_XFRM_QUEUE) {
1798 dst_release(dst);
1799
1800 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1801 goto purge_queue;
1802
1803 pq->timeout = pq->timeout << 1;
1804 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1805 xfrm_pol_hold(pol);
1806 goto out;
1807 }
1808
1809 dst_release(dst);
1810
1811 __skb_queue_head_init(&list);
1812
1813 spin_lock(&pq->hold_queue.lock);
1814 pq->timeout = 0;
1815 skb_queue_splice_init(&pq->hold_queue, &list);
1816 spin_unlock(&pq->hold_queue.lock);
1817
1818 while (!skb_queue_empty(&list)) {
1819 skb = __skb_dequeue(&list);
1820
1821 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1822 dst_hold(skb_dst(skb)->path);
1823 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1824 &fl, skb->sk, 0);
1825 if (IS_ERR(dst)) {
1826 kfree_skb(skb);
1827 continue;
1828 }
1829
1830 nf_reset(skb);
1831 skb_dst_drop(skb);
1832 skb_dst_set(skb, dst);
1833
1834 err = dst_output(skb);
1835 }
1836
1837 out:
1838 xfrm_pol_put(pol);
1839 return;
1840
1841 purge_queue:
1842 pq->timeout = 0;
1843 xfrm_queue_purge(&pq->hold_queue);
1844 xfrm_pol_put(pol);
1845 }
1846
1847 static int xdst_queue_output(struct sk_buff *skb)
1848 {
1849 unsigned long sched_next;
1850 struct dst_entry *dst = skb_dst(skb);
1851 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1852 struct xfrm_policy *pol = xdst->pols[0];
1853 struct xfrm_policy_queue *pq = &pol->polq;
1854 const struct sk_buff *fclone = skb + 1;
1855
1856 if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
1857 fclone->fclone == SKB_FCLONE_CLONE)) {
1858 kfree_skb(skb);
1859 return 0;
1860 }
1861
1862 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1863 kfree_skb(skb);
1864 return -EAGAIN;
1865 }
1866
1867 skb_dst_force(skb);
1868
1869 spin_lock_bh(&pq->hold_queue.lock);
1870
1871 if (!pq->timeout)
1872 pq->timeout = XFRM_QUEUE_TMO_MIN;
1873
1874 sched_next = jiffies + pq->timeout;
1875
1876 if (del_timer(&pq->hold_timer)) {
1877 if (time_before(pq->hold_timer.expires, sched_next))
1878 sched_next = pq->hold_timer.expires;
1879 xfrm_pol_put(pol);
1880 }
1881
1882 __skb_queue_tail(&pq->hold_queue, skb);
1883 if (!mod_timer(&pq->hold_timer, sched_next))
1884 xfrm_pol_hold(pol);
1885
1886 spin_unlock_bh(&pq->hold_queue.lock);
1887
1888 return 0;
1889 }
1890
1891 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
1892 struct dst_entry *dst,
1893 const struct flowi *fl,
1894 int num_xfrms,
1895 u16 family)
1896 {
1897 int err;
1898 struct net_device *dev;
1899 struct dst_entry *dst1;
1900 struct xfrm_dst *xdst;
1901
1902 xdst = xfrm_alloc_dst(net, family);
1903 if (IS_ERR(xdst))
1904 return xdst;
1905
1906 if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0)
1907 return xdst;
1908
1909 dst1 = &xdst->u.dst;
1910 dst_hold(dst);
1911 xdst->route = dst;
1912
1913 dst_copy_metrics(dst1, dst);
1914
1915 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1916 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
1917 dst1->lastuse = jiffies;
1918
1919 dst1->input = dst_discard;
1920 dst1->output = xdst_queue_output;
1921
1922 dst_hold(dst);
1923 dst1->child = dst;
1924 dst1->path = dst;
1925
1926 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
1927
1928 err = -ENODEV;
1929 dev = dst->dev;
1930 if (!dev)
1931 goto free_dst;
1932
1933 err = xfrm_fill_dst(xdst, dev, fl);
1934 if (err)
1935 goto free_dst;
1936
1937 out:
1938 return xdst;
1939
1940 free_dst:
1941 dst_release(dst1);
1942 xdst = ERR_PTR(err);
1943 goto out;
1944 }
1945
1946 static struct flow_cache_object *
1947 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1948 struct flow_cache_object *oldflo, void *ctx)
1949 {
1950 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1951 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1952 struct xfrm_dst *xdst, *new_xdst;
1953 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1954
1955 /* Check if the policies from old bundle are usable */
1956 xdst = NULL;
1957 if (oldflo) {
1958 xdst = container_of(oldflo, struct xfrm_dst, flo);
1959 num_pols = xdst->num_pols;
1960 num_xfrms = xdst->num_xfrms;
1961 pol_dead = 0;
1962 for (i = 0; i < num_pols; i++) {
1963 pols[i] = xdst->pols[i];
1964 pol_dead |= pols[i]->walk.dead;
1965 }
1966 if (pol_dead) {
1967 dst_free(&xdst->u.dst);
1968 xdst = NULL;
1969 num_pols = 0;
1970 num_xfrms = 0;
1971 oldflo = NULL;
1972 }
1973 }
1974
1975 /* Resolve policies to use if we couldn't get them from
1976 * previous cache entry */
1977 if (xdst == NULL) {
1978 num_pols = 1;
1979 pols[0] = __xfrm_policy_lookup(net, fl, family,
1980 flow_to_policy_dir(dir));
1981 err = xfrm_expand_policies(fl, family, pols,
1982 &num_pols, &num_xfrms);
1983 if (err < 0)
1984 goto inc_error;
1985 if (num_pols == 0)
1986 return NULL;
1987 if (num_xfrms <= 0)
1988 goto make_dummy_bundle;
1989 }
1990
1991 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1992 if (IS_ERR(new_xdst)) {
1993 err = PTR_ERR(new_xdst);
1994 if (err != -EAGAIN)
1995 goto error;
1996 if (oldflo == NULL)
1997 goto make_dummy_bundle;
1998 dst_hold(&xdst->u.dst);
1999 return oldflo;
2000 } else if (new_xdst == NULL) {
2001 num_xfrms = 0;
2002 if (oldflo == NULL)
2003 goto make_dummy_bundle;
2004 xdst->num_xfrms = 0;
2005 dst_hold(&xdst->u.dst);
2006 return oldflo;
2007 }
2008
2009 /* Kill the previous bundle */
2010 if (xdst) {
2011 /* The policies were stolen for newly generated bundle */
2012 xdst->num_pols = 0;
2013 dst_free(&xdst->u.dst);
2014 }
2015
2016 /* Flow cache does not have reference, it dst_free()'s,
2017 * but we do need to return one reference for original caller */
2018 dst_hold(&new_xdst->u.dst);
2019 return &new_xdst->flo;
2020
2021 make_dummy_bundle:
2022 /* We found policies, but there's no bundles to instantiate:
2023 * either because the policy blocks, has no transformations or
2024 * we could not build template (no xfrm_states).*/
2025 xdst = xfrm_create_dummy_bundle(net, dst_orig, fl, num_xfrms, family);
2026 if (IS_ERR(xdst)) {
2027 xfrm_pols_put(pols, num_pols);
2028 return ERR_CAST(xdst);
2029 }
2030 xdst->num_pols = num_pols;
2031 xdst->num_xfrms = num_xfrms;
2032 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2033
2034 dst_hold(&xdst->u.dst);
2035 return &xdst->flo;
2036
2037 inc_error:
2038 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2039 error:
2040 if (xdst != NULL)
2041 dst_free(&xdst->u.dst);
2042 else
2043 xfrm_pols_put(pols, num_pols);
2044 return ERR_PTR(err);
2045 }
2046
2047 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2048 struct dst_entry *dst_orig)
2049 {
2050 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2051 struct dst_entry *ret;
2052
2053 if (!afinfo) {
2054 dst_release(dst_orig);
2055 return ERR_PTR(-EINVAL);
2056 } else {
2057 ret = afinfo->blackhole_route(net, dst_orig);
2058 }
2059 xfrm_policy_put_afinfo(afinfo);
2060
2061 return ret;
2062 }
2063
2064 /* Main function: finds/creates a bundle for given flow.
2065 *
2066 * At the moment we eat a raw IP route. Mostly to speed up lookups
2067 * on interfaces with disabled IPsec.
2068 */
2069 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2070 const struct flowi *fl,
2071 struct sock *sk, int flags)
2072 {
2073 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2074 struct flow_cache_object *flo;
2075 struct xfrm_dst *xdst;
2076 struct dst_entry *dst, *route;
2077 u16 family = dst_orig->ops->family;
2078 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2079 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2080
2081 dst = NULL;
2082 xdst = NULL;
2083 route = NULL;
2084
2085 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2086 num_pols = 1;
2087 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2088 err = xfrm_expand_policies(fl, family, pols,
2089 &num_pols, &num_xfrms);
2090 if (err < 0)
2091 goto dropdst;
2092
2093 if (num_pols) {
2094 if (num_xfrms <= 0) {
2095 drop_pols = num_pols;
2096 goto no_transform;
2097 }
2098
2099 xdst = xfrm_resolve_and_create_bundle(
2100 pols, num_pols, fl,
2101 family, dst_orig);
2102 if (IS_ERR(xdst)) {
2103 xfrm_pols_put(pols, num_pols);
2104 err = PTR_ERR(xdst);
2105 goto dropdst;
2106 } else if (xdst == NULL) {
2107 num_xfrms = 0;
2108 drop_pols = num_pols;
2109 goto no_transform;
2110 }
2111
2112 dst_hold(&xdst->u.dst);
2113
2114 spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
2115 xdst->u.dst.next = xfrm_policy_sk_bundles;
2116 xfrm_policy_sk_bundles = &xdst->u.dst;
2117 spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
2118
2119 route = xdst->route;
2120 }
2121 }
2122
2123 if (xdst == NULL) {
2124 /* To accelerate a bit... */
2125 if ((dst_orig->flags & DST_NOXFRM) ||
2126 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2127 goto nopol;
2128
2129 flo = flow_cache_lookup(net, fl, family, dir,
2130 xfrm_bundle_lookup, dst_orig);
2131 if (flo == NULL)
2132 goto nopol;
2133 if (IS_ERR(flo)) {
2134 err = PTR_ERR(flo);
2135 goto dropdst;
2136 }
2137 xdst = container_of(flo, struct xfrm_dst, flo);
2138
2139 num_pols = xdst->num_pols;
2140 num_xfrms = xdst->num_xfrms;
2141 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2142 route = xdst->route;
2143 }
2144
2145 dst = &xdst->u.dst;
2146 if (route == NULL && num_xfrms > 0) {
2147 /* The only case when xfrm_bundle_lookup() returns a
2148 * bundle with null route, is when the template could
2149 * not be resolved. It means policies are there, but
2150 * bundle could not be created, since we don't yet
2151 * have the xfrm_state's. We need to wait for KM to
2152 * negotiate new SA's or bail out with error.*/
2153 if (net->xfrm.sysctl_larval_drop) {
2154 dst_release(dst);
2155 xfrm_pols_put(pols, drop_pols);
2156 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2157
2158 return make_blackhole(net, family, dst_orig);
2159 }
2160
2161 err = -EAGAIN;
2162
2163 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2164 goto error;
2165 }
2166
2167 no_transform:
2168 if (num_pols == 0)
2169 goto nopol;
2170
2171 if ((flags & XFRM_LOOKUP_ICMP) &&
2172 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2173 err = -ENOENT;
2174 goto error;
2175 }
2176
2177 for (i = 0; i < num_pols; i++)
2178 pols[i]->curlft.use_time = get_seconds();
2179
2180 if (num_xfrms < 0) {
2181 /* Prohibit the flow */
2182 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2183 err = -EPERM;
2184 goto error;
2185 } else if (num_xfrms > 0) {
2186 /* Flow transformed */
2187 dst_release(dst_orig);
2188 } else {
2189 /* Flow passes untransformed */
2190 dst_release(dst);
2191 dst = dst_orig;
2192 }
2193 ok:
2194 xfrm_pols_put(pols, drop_pols);
2195 if (dst && dst->xfrm &&
2196 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2197 dst->flags |= DST_XFRM_TUNNEL;
2198 return dst;
2199
2200 nopol:
2201 if (!(flags & XFRM_LOOKUP_ICMP)) {
2202 dst = dst_orig;
2203 goto ok;
2204 }
2205 err = -ENOENT;
2206 error:
2207 dst_release(dst);
2208 dropdst:
2209 dst_release(dst_orig);
2210 xfrm_pols_put(pols, drop_pols);
2211 return ERR_PTR(err);
2212 }
2213 EXPORT_SYMBOL(xfrm_lookup);
2214
2215 static inline int
2216 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2217 {
2218 struct xfrm_state *x;
2219
2220 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2221 return 0;
2222 x = skb->sp->xvec[idx];
2223 if (!x->type->reject)
2224 return 0;
2225 return x->type->reject(x, skb, fl);
2226 }
2227
2228 /* When skb is transformed back to its "native" form, we have to
2229 * check policy restrictions. At the moment we make this in maximally
2230 * stupid way. Shame on me. :-) Of course, connected sockets must
2231 * have policy cached at them.
2232 */
2233
2234 static inline int
2235 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2236 unsigned short family)
2237 {
2238 if (xfrm_state_kern(x))
2239 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2240 return x->id.proto == tmpl->id.proto &&
2241 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2242 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2243 x->props.mode == tmpl->mode &&
2244 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2245 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2246 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2247 xfrm_state_addr_cmp(tmpl, x, family));
2248 }
2249
2250 /*
2251 * 0 or more than 0 is returned when validation is succeeded (either bypass
2252 * because of optional transport mode, or next index of the mathced secpath
2253 * state with the template.
2254 * -1 is returned when no matching template is found.
2255 * Otherwise "-2 - errored_index" is returned.
2256 */
2257 static inline int
2258 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2259 unsigned short family)
2260 {
2261 int idx = start;
2262
2263 if (tmpl->optional) {
2264 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2265 return start;
2266 } else
2267 start = -1;
2268 for (; idx < sp->len; idx++) {
2269 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2270 return ++idx;
2271 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2272 if (start == -1)
2273 start = -2-idx;
2274 break;
2275 }
2276 }
2277 return start;
2278 }
2279
2280 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2281 unsigned int family, int reverse)
2282 {
2283 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2284 int err;
2285
2286 if (unlikely(afinfo == NULL))
2287 return -EAFNOSUPPORT;
2288
2289 afinfo->decode_session(skb, fl, reverse);
2290 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2291 xfrm_policy_put_afinfo(afinfo);
2292 return err;
2293 }
2294 EXPORT_SYMBOL(__xfrm_decode_session);
2295
2296 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2297 {
2298 for (; k < sp->len; k++) {
2299 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2300 *idxp = k;
2301 return 1;
2302 }
2303 }
2304
2305 return 0;
2306 }
2307
2308 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2309 unsigned short family)
2310 {
2311 struct net *net = dev_net(skb->dev);
2312 struct xfrm_policy *pol;
2313 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2314 int npols = 0;
2315 int xfrm_nr;
2316 int pi;
2317 int reverse;
2318 struct flowi fl;
2319 u8 fl_dir;
2320 int xerr_idx = -1;
2321
2322 reverse = dir & ~XFRM_POLICY_MASK;
2323 dir &= XFRM_POLICY_MASK;
2324 fl_dir = policy_to_flow_dir(dir);
2325
2326 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2327 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2328 return 0;
2329 }
2330
2331 nf_nat_decode_session(skb, &fl, family);
2332
2333 /* First, check used SA against their selectors. */
2334 if (skb->sp) {
2335 int i;
2336
2337 for (i = skb->sp->len-1; i >= 0; i--) {
2338 struct xfrm_state *x = skb->sp->xvec[i];
2339 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2340 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2341 return 0;
2342 }
2343 }
2344 }
2345
2346 pol = NULL;
2347 if (sk && sk->sk_policy[dir]) {
2348 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2349 if (IS_ERR(pol)) {
2350 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2351 return 0;
2352 }
2353 }
2354
2355 if (!pol) {
2356 struct flow_cache_object *flo;
2357
2358 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2359 xfrm_policy_lookup, NULL);
2360 if (IS_ERR_OR_NULL(flo))
2361 pol = ERR_CAST(flo);
2362 else
2363 pol = container_of(flo, struct xfrm_policy, flo);
2364 }
2365
2366 if (IS_ERR(pol)) {
2367 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2368 return 0;
2369 }
2370
2371 if (!pol) {
2372 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2373 xfrm_secpath_reject(xerr_idx, skb, &fl);
2374 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2375 return 0;
2376 }
2377 return 1;
2378 }
2379
2380 pol->curlft.use_time = get_seconds();
2381
2382 pols[0] = pol;
2383 npols++;
2384 #ifdef CONFIG_XFRM_SUB_POLICY
2385 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2386 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2387 &fl, family,
2388 XFRM_POLICY_IN);
2389 if (pols[1]) {
2390 if (IS_ERR(pols[1])) {
2391 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2392 return 0;
2393 }
2394 pols[1]->curlft.use_time = get_seconds();
2395 npols++;
2396 }
2397 }
2398 #endif
2399
2400 if (pol->action == XFRM_POLICY_ALLOW) {
2401 struct sec_path *sp;
2402 static struct sec_path dummy;
2403 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2404 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2405 struct xfrm_tmpl **tpp = tp;
2406 int ti = 0;
2407 int i, k;
2408
2409 if ((sp = skb->sp) == NULL)
2410 sp = &dummy;
2411
2412 for (pi = 0; pi < npols; pi++) {
2413 if (pols[pi] != pol &&
2414 pols[pi]->action != XFRM_POLICY_ALLOW) {
2415 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2416 goto reject;
2417 }
2418 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2419 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2420 goto reject_error;
2421 }
2422 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2423 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2424 }
2425 xfrm_nr = ti;
2426 if (npols > 1) {
2427 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2428 tpp = stp;
2429 }
2430
2431 /* For each tunnel xfrm, find the first matching tmpl.
2432 * For each tmpl before that, find corresponding xfrm.
2433 * Order is _important_. Later we will implement
2434 * some barriers, but at the moment barriers
2435 * are implied between each two transformations.
2436 */
2437 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2438 k = xfrm_policy_ok(tpp[i], sp, k, family);
2439 if (k < 0) {
2440 if (k < -1)
2441 /* "-2 - errored_index" returned */
2442 xerr_idx = -(2+k);
2443 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2444 goto reject;
2445 }
2446 }
2447
2448 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2449 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2450 goto reject;
2451 }
2452
2453 xfrm_pols_put(pols, npols);
2454 return 1;
2455 }
2456 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2457
2458 reject:
2459 xfrm_secpath_reject(xerr_idx, skb, &fl);
2460 reject_error:
2461 xfrm_pols_put(pols, npols);
2462 return 0;
2463 }
2464 EXPORT_SYMBOL(__xfrm_policy_check);
2465
2466 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2467 {
2468 struct net *net = dev_net(skb->dev);
2469 struct flowi fl;
2470 struct dst_entry *dst;
2471 int res = 1;
2472
2473 if (xfrm_decode_session(skb, &fl, family) < 0) {
2474 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2475 return 0;
2476 }
2477
2478 skb_dst_force(skb);
2479
2480 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2481 if (IS_ERR(dst)) {
2482 res = 0;
2483 dst = NULL;
2484 }
2485 skb_dst_set(skb, dst);
2486 return res;
2487 }
2488 EXPORT_SYMBOL(__xfrm_route_forward);
2489
2490 /* Optimize later using cookies and generation ids. */
2491
2492 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2493 {
2494 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2495 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2496 * get validated by dst_ops->check on every use. We do this
2497 * because when a normal route referenced by an XFRM dst is
2498 * obsoleted we do not go looking around for all parent
2499 * referencing XFRM dsts so that we can invalidate them. It
2500 * is just too much work. Instead we make the checks here on
2501 * every use. For example:
2502 *
2503 * XFRM dst A --> IPv4 dst X
2504 *
2505 * X is the "xdst->route" of A (X is also the "dst->path" of A
2506 * in this example). If X is marked obsolete, "A" will not
2507 * notice. That's what we are validating here via the
2508 * stale_bundle() check.
2509 *
2510 * When a policy's bundle is pruned, we dst_free() the XFRM
2511 * dst which causes it's ->obsolete field to be set to
2512 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2513 * this, we want to force a new route lookup.
2514 */
2515 if (dst->obsolete < 0 && !stale_bundle(dst))
2516 return dst;
2517
2518 return NULL;
2519 }
2520
2521 static int stale_bundle(struct dst_entry *dst)
2522 {
2523 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2524 }
2525
2526 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2527 {
2528 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2529 dst->dev = dev_net(dev)->loopback_dev;
2530 dev_hold(dst->dev);
2531 dev_put(dev);
2532 }
2533 }
2534 EXPORT_SYMBOL(xfrm_dst_ifdown);
2535
2536 static void xfrm_link_failure(struct sk_buff *skb)
2537 {
2538 /* Impossible. Such dst must be popped before reaches point of failure. */
2539 }
2540
2541 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2542 {
2543 if (dst) {
2544 if (dst->obsolete) {
2545 dst_release(dst);
2546 dst = NULL;
2547 }
2548 }
2549 return dst;
2550 }
2551
2552 static void __xfrm_garbage_collect(struct net *net)
2553 {
2554 struct dst_entry *head, *next;
2555
2556 spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
2557 head = xfrm_policy_sk_bundles;
2558 xfrm_policy_sk_bundles = NULL;
2559 spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
2560
2561 while (head) {
2562 next = head->next;
2563 dst_free(head);
2564 head = next;
2565 }
2566 }
2567
2568 void xfrm_garbage_collect(struct net *net)
2569 {
2570 flow_cache_flush();
2571 __xfrm_garbage_collect(net);
2572 }
2573 EXPORT_SYMBOL(xfrm_garbage_collect);
2574
2575 static void xfrm_garbage_collect_deferred(struct net *net)
2576 {
2577 flow_cache_flush_deferred();
2578 __xfrm_garbage_collect(net);
2579 }
2580
2581 static void xfrm_init_pmtu(struct dst_entry *dst)
2582 {
2583 do {
2584 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2585 u32 pmtu, route_mtu_cached;
2586
2587 pmtu = dst_mtu(dst->child);
2588 xdst->child_mtu_cached = pmtu;
2589
2590 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2591
2592 route_mtu_cached = dst_mtu(xdst->route);
2593 xdst->route_mtu_cached = route_mtu_cached;
2594
2595 if (pmtu > route_mtu_cached)
2596 pmtu = route_mtu_cached;
2597
2598 dst_metric_set(dst, RTAX_MTU, pmtu);
2599 } while ((dst = dst->next));
2600 }
2601
2602 /* Check that the bundle accepts the flow and its components are
2603 * still valid.
2604 */
2605
2606 static int xfrm_bundle_ok(struct xfrm_dst *first)
2607 {
2608 struct dst_entry *dst = &first->u.dst;
2609 struct xfrm_dst *last;
2610 u32 mtu;
2611
2612 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2613 (dst->dev && !netif_running(dst->dev)))
2614 return 0;
2615
2616 if (dst->flags & DST_XFRM_QUEUE)
2617 return 1;
2618
2619 last = NULL;
2620
2621 do {
2622 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2623
2624 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2625 return 0;
2626 if (xdst->xfrm_genid != dst->xfrm->genid)
2627 return 0;
2628 if (xdst->num_pols > 0 &&
2629 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2630 return 0;
2631
2632 mtu = dst_mtu(dst->child);
2633 if (xdst->child_mtu_cached != mtu) {
2634 last = xdst;
2635 xdst->child_mtu_cached = mtu;
2636 }
2637
2638 if (!dst_check(xdst->route, xdst->route_cookie))
2639 return 0;
2640 mtu = dst_mtu(xdst->route);
2641 if (xdst->route_mtu_cached != mtu) {
2642 last = xdst;
2643 xdst->route_mtu_cached = mtu;
2644 }
2645
2646 dst = dst->child;
2647 } while (dst->xfrm);
2648
2649 if (likely(!last))
2650 return 1;
2651
2652 mtu = last->child_mtu_cached;
2653 for (;;) {
2654 dst = &last->u.dst;
2655
2656 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2657 if (mtu > last->route_mtu_cached)
2658 mtu = last->route_mtu_cached;
2659 dst_metric_set(dst, RTAX_MTU, mtu);
2660
2661 if (last == first)
2662 break;
2663
2664 last = (struct xfrm_dst *)last->u.dst.next;
2665 last->child_mtu_cached = mtu;
2666 }
2667
2668 return 1;
2669 }
2670
2671 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2672 {
2673 return dst_metric_advmss(dst->path);
2674 }
2675
2676 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2677 {
2678 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2679
2680 return mtu ? : dst_mtu(dst->path);
2681 }
2682
2683 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2684 struct sk_buff *skb,
2685 const void *daddr)
2686 {
2687 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2688 }
2689
2690 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2691 {
2692 struct net *net;
2693 int err = 0;
2694 if (unlikely(afinfo == NULL))
2695 return -EINVAL;
2696 if (unlikely(afinfo->family >= NPROTO))
2697 return -EAFNOSUPPORT;
2698 spin_lock(&xfrm_policy_afinfo_lock);
2699 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2700 err = -ENOBUFS;
2701 else {
2702 struct dst_ops *dst_ops = afinfo->dst_ops;
2703 if (likely(dst_ops->kmem_cachep == NULL))
2704 dst_ops->kmem_cachep = xfrm_dst_cache;
2705 if (likely(dst_ops->check == NULL))
2706 dst_ops->check = xfrm_dst_check;
2707 if (likely(dst_ops->default_advmss == NULL))
2708 dst_ops->default_advmss = xfrm_default_advmss;
2709 if (likely(dst_ops->mtu == NULL))
2710 dst_ops->mtu = xfrm_mtu;
2711 if (likely(dst_ops->negative_advice == NULL))
2712 dst_ops->negative_advice = xfrm_negative_advice;
2713 if (likely(dst_ops->link_failure == NULL))
2714 dst_ops->link_failure = xfrm_link_failure;
2715 if (likely(dst_ops->neigh_lookup == NULL))
2716 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2717 if (likely(afinfo->garbage_collect == NULL))
2718 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2719 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2720 }
2721 spin_unlock(&xfrm_policy_afinfo_lock);
2722
2723 rtnl_lock();
2724 for_each_net(net) {
2725 struct dst_ops *xfrm_dst_ops;
2726
2727 switch (afinfo->family) {
2728 case AF_INET:
2729 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2730 break;
2731 #if IS_ENABLED(CONFIG_IPV6)
2732 case AF_INET6:
2733 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2734 break;
2735 #endif
2736 default:
2737 BUG();
2738 }
2739 *xfrm_dst_ops = *afinfo->dst_ops;
2740 }
2741 rtnl_unlock();
2742
2743 return err;
2744 }
2745 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2746
2747 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2748 {
2749 int err = 0;
2750 if (unlikely(afinfo == NULL))
2751 return -EINVAL;
2752 if (unlikely(afinfo->family >= NPROTO))
2753 return -EAFNOSUPPORT;
2754 spin_lock(&xfrm_policy_afinfo_lock);
2755 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2756 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2757 err = -EINVAL;
2758 else
2759 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2760 NULL);
2761 }
2762 spin_unlock(&xfrm_policy_afinfo_lock);
2763 if (!err) {
2764 struct dst_ops *dst_ops = afinfo->dst_ops;
2765
2766 synchronize_rcu();
2767
2768 dst_ops->kmem_cachep = NULL;
2769 dst_ops->check = NULL;
2770 dst_ops->negative_advice = NULL;
2771 dst_ops->link_failure = NULL;
2772 afinfo->garbage_collect = NULL;
2773 }
2774 return err;
2775 }
2776 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2777
2778 static void __net_init xfrm_dst_ops_init(struct net *net)
2779 {
2780 struct xfrm_policy_afinfo *afinfo;
2781
2782 rcu_read_lock();
2783 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2784 if (afinfo)
2785 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2786 #if IS_ENABLED(CONFIG_IPV6)
2787 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2788 if (afinfo)
2789 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2790 #endif
2791 rcu_read_unlock();
2792 }
2793
2794 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2795 {
2796 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2797
2798 switch (event) {
2799 case NETDEV_DOWN:
2800 xfrm_garbage_collect(dev_net(dev));
2801 }
2802 return NOTIFY_DONE;
2803 }
2804
2805 static struct notifier_block xfrm_dev_notifier = {
2806 .notifier_call = xfrm_dev_event,
2807 };
2808
2809 #ifdef CONFIG_XFRM_STATISTICS
2810 static int __net_init xfrm_statistics_init(struct net *net)
2811 {
2812 int rv;
2813
2814 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2815 sizeof(struct linux_xfrm_mib),
2816 __alignof__(struct linux_xfrm_mib)) < 0)
2817 return -ENOMEM;
2818 rv = xfrm_proc_init(net);
2819 if (rv < 0)
2820 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2821 return rv;
2822 }
2823
2824 static void xfrm_statistics_fini(struct net *net)
2825 {
2826 xfrm_proc_fini(net);
2827 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2828 }
2829 #else
2830 static int __net_init xfrm_statistics_init(struct net *net)
2831 {
2832 return 0;
2833 }
2834
2835 static void xfrm_statistics_fini(struct net *net)
2836 {
2837 }
2838 #endif
2839
2840 static int __net_init xfrm_policy_init(struct net *net)
2841 {
2842 unsigned int hmask, sz;
2843 int dir;
2844
2845 if (net_eq(net, &init_net))
2846 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2847 sizeof(struct xfrm_dst),
2848 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2849 NULL);
2850
2851 hmask = 8 - 1;
2852 sz = (hmask+1) * sizeof(struct hlist_head);
2853
2854 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2855 if (!net->xfrm.policy_byidx)
2856 goto out_byidx;
2857 net->xfrm.policy_idx_hmask = hmask;
2858
2859 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2860 struct xfrm_policy_hash *htab;
2861
2862 net->xfrm.policy_count[dir] = 0;
2863 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2864
2865 htab = &net->xfrm.policy_bydst[dir];
2866 htab->table = xfrm_hash_alloc(sz);
2867 if (!htab->table)
2868 goto out_bydst;
2869 htab->hmask = hmask;
2870 }
2871
2872 INIT_LIST_HEAD(&net->xfrm.policy_all);
2873 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2874 if (net_eq(net, &init_net))
2875 register_netdevice_notifier(&xfrm_dev_notifier);
2876 return 0;
2877
2878 out_bydst:
2879 for (dir--; dir >= 0; dir--) {
2880 struct xfrm_policy_hash *htab;
2881
2882 htab = &net->xfrm.policy_bydst[dir];
2883 xfrm_hash_free(htab->table, sz);
2884 }
2885 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2886 out_byidx:
2887 return -ENOMEM;
2888 }
2889
2890 static void xfrm_policy_fini(struct net *net)
2891 {
2892 struct xfrm_audit audit_info;
2893 unsigned int sz;
2894 int dir;
2895
2896 flush_work(&net->xfrm.policy_hash_work);
2897 #ifdef CONFIG_XFRM_SUB_POLICY
2898 audit_info.loginuid = INVALID_UID;
2899 audit_info.sessionid = (unsigned int)-1;
2900 audit_info.secid = 0;
2901 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2902 #endif
2903 audit_info.loginuid = INVALID_UID;
2904 audit_info.sessionid = (unsigned int)-1;
2905 audit_info.secid = 0;
2906 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2907
2908 WARN_ON(!list_empty(&net->xfrm.policy_all));
2909
2910 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2911 struct xfrm_policy_hash *htab;
2912
2913 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2914
2915 htab = &net->xfrm.policy_bydst[dir];
2916 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
2917 WARN_ON(!hlist_empty(htab->table));
2918 xfrm_hash_free(htab->table, sz);
2919 }
2920
2921 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2922 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2923 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2924 }
2925
2926 static int __net_init xfrm_net_init(struct net *net)
2927 {
2928 int rv;
2929
2930 rv = xfrm_statistics_init(net);
2931 if (rv < 0)
2932 goto out_statistics;
2933 rv = xfrm_state_init(net);
2934 if (rv < 0)
2935 goto out_state;
2936 rv = xfrm_policy_init(net);
2937 if (rv < 0)
2938 goto out_policy;
2939 xfrm_dst_ops_init(net);
2940 rv = xfrm_sysctl_init(net);
2941 if (rv < 0)
2942 goto out_sysctl;
2943
2944 /* Initialize the per-net locks here */
2945 spin_lock_init(&net->xfrm.xfrm_state_lock);
2946 rwlock_init(&net->xfrm.xfrm_policy_lock);
2947 spin_lock_init(&net->xfrm.xfrm_policy_sk_bundle_lock);
2948 mutex_init(&net->xfrm.xfrm_cfg_mutex);
2949
2950 return 0;
2951
2952 out_sysctl:
2953 xfrm_policy_fini(net);
2954 out_policy:
2955 xfrm_state_fini(net);
2956 out_state:
2957 xfrm_statistics_fini(net);
2958 out_statistics:
2959 return rv;
2960 }
2961
2962 static void __net_exit xfrm_net_exit(struct net *net)
2963 {
2964 xfrm_sysctl_fini(net);
2965 xfrm_policy_fini(net);
2966 xfrm_state_fini(net);
2967 xfrm_statistics_fini(net);
2968 }
2969
2970 static struct pernet_operations __net_initdata xfrm_net_ops = {
2971 .init = xfrm_net_init,
2972 .exit = xfrm_net_exit,
2973 };
2974
2975 void __init xfrm_init(void)
2976 {
2977 register_pernet_subsys(&xfrm_net_ops);
2978 xfrm_input_init();
2979 }
2980
2981 #ifdef CONFIG_AUDITSYSCALL
2982 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2983 struct audit_buffer *audit_buf)
2984 {
2985 struct xfrm_sec_ctx *ctx = xp->security;
2986 struct xfrm_selector *sel = &xp->selector;
2987
2988 if (ctx)
2989 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2990 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2991
2992 switch (sel->family) {
2993 case AF_INET:
2994 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2995 if (sel->prefixlen_s != 32)
2996 audit_log_format(audit_buf, " src_prefixlen=%d",
2997 sel->prefixlen_s);
2998 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2999 if (sel->prefixlen_d != 32)
3000 audit_log_format(audit_buf, " dst_prefixlen=%d",
3001 sel->prefixlen_d);
3002 break;
3003 case AF_INET6:
3004 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3005 if (sel->prefixlen_s != 128)
3006 audit_log_format(audit_buf, " src_prefixlen=%d",
3007 sel->prefixlen_s);
3008 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3009 if (sel->prefixlen_d != 128)
3010 audit_log_format(audit_buf, " dst_prefixlen=%d",
3011 sel->prefixlen_d);
3012 break;
3013 }
3014 }
3015
3016 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
3017 kuid_t auid, unsigned int sessionid, u32 secid)
3018 {
3019 struct audit_buffer *audit_buf;
3020
3021 audit_buf = xfrm_audit_start("SPD-add");
3022 if (audit_buf == NULL)
3023 return;
3024 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
3025 audit_log_format(audit_buf, " res=%u", result);
3026 xfrm_audit_common_policyinfo(xp, audit_buf);
3027 audit_log_end(audit_buf);
3028 }
3029 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3030
3031 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3032 kuid_t auid, unsigned int sessionid, u32 secid)
3033 {
3034 struct audit_buffer *audit_buf;
3035
3036 audit_buf = xfrm_audit_start("SPD-delete");
3037 if (audit_buf == NULL)
3038 return;
3039 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
3040 audit_log_format(audit_buf, " res=%u", result);
3041 xfrm_audit_common_policyinfo(xp, audit_buf);
3042 audit_log_end(audit_buf);
3043 }
3044 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3045 #endif
3046
3047 #ifdef CONFIG_XFRM_MIGRATE
3048 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3049 const struct xfrm_selector *sel_tgt)
3050 {
3051 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3052 if (sel_tgt->family == sel_cmp->family &&
3053 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3054 sel_cmp->family) &&
3055 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3056 sel_cmp->family) &&
3057 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3058 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3059 return true;
3060 }
3061 } else {
3062 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3063 return true;
3064 }
3065 }
3066 return false;
3067 }
3068
3069 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3070 u8 dir, u8 type, struct net *net)
3071 {
3072 struct xfrm_policy *pol, *ret = NULL;
3073 struct hlist_head *chain;
3074 u32 priority = ~0U;
3075
3076 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
3077 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3078 hlist_for_each_entry(pol, chain, bydst) {
3079 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3080 pol->type == type) {
3081 ret = pol;
3082 priority = ret->priority;
3083 break;
3084 }
3085 }
3086 chain = &net->xfrm.policy_inexact[dir];
3087 hlist_for_each_entry(pol, chain, bydst) {
3088 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3089 pol->type == type &&
3090 pol->priority < priority) {
3091 ret = pol;
3092 break;
3093 }
3094 }
3095
3096 if (ret)
3097 xfrm_pol_hold(ret);
3098
3099 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
3100
3101 return ret;
3102 }
3103
3104 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3105 {
3106 int match = 0;
3107
3108 if (t->mode == m->mode && t->id.proto == m->proto &&
3109 (m->reqid == 0 || t->reqid == m->reqid)) {
3110 switch (t->mode) {
3111 case XFRM_MODE_TUNNEL:
3112 case XFRM_MODE_BEET:
3113 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3114 m->old_family) &&
3115 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3116 m->old_family)) {
3117 match = 1;
3118 }
3119 break;
3120 case XFRM_MODE_TRANSPORT:
3121 /* in case of transport mode, template does not store
3122 any IP addresses, hence we just compare mode and
3123 protocol */
3124 match = 1;
3125 break;
3126 default:
3127 break;
3128 }
3129 }
3130 return match;
3131 }
3132
3133 /* update endpoint address(es) of template(s) */
3134 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3135 struct xfrm_migrate *m, int num_migrate)
3136 {
3137 struct xfrm_migrate *mp;
3138 int i, j, n = 0;
3139
3140 write_lock_bh(&pol->lock);
3141 if (unlikely(pol->walk.dead)) {
3142 /* target policy has been deleted */
3143 write_unlock_bh(&pol->lock);
3144 return -ENOENT;
3145 }
3146
3147 for (i = 0; i < pol->xfrm_nr; i++) {
3148 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3149 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3150 continue;
3151 n++;
3152 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3153 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3154 continue;
3155 /* update endpoints */
3156 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3157 sizeof(pol->xfrm_vec[i].id.daddr));
3158 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3159 sizeof(pol->xfrm_vec[i].saddr));
3160 pol->xfrm_vec[i].encap_family = mp->new_family;
3161 /* flush bundles */
3162 atomic_inc(&pol->genid);
3163 }
3164 }
3165
3166 write_unlock_bh(&pol->lock);
3167
3168 if (!n)
3169 return -ENODATA;
3170
3171 return 0;
3172 }
3173
3174 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3175 {
3176 int i, j;
3177
3178 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3179 return -EINVAL;
3180
3181 for (i = 0; i < num_migrate; i++) {
3182 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3183 m[i].old_family) &&
3184 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3185 m[i].old_family))
3186 return -EINVAL;
3187 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3188 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3189 return -EINVAL;
3190
3191 /* check if there is any duplicated entry */
3192 for (j = i + 1; j < num_migrate; j++) {
3193 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3194 sizeof(m[i].old_daddr)) &&
3195 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3196 sizeof(m[i].old_saddr)) &&
3197 m[i].proto == m[j].proto &&
3198 m[i].mode == m[j].mode &&
3199 m[i].reqid == m[j].reqid &&
3200 m[i].old_family == m[j].old_family)
3201 return -EINVAL;
3202 }
3203 }
3204
3205 return 0;
3206 }
3207
3208 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3209 struct xfrm_migrate *m, int num_migrate,
3210 struct xfrm_kmaddress *k, struct net *net)
3211 {
3212 int i, err, nx_cur = 0, nx_new = 0;
3213 struct xfrm_policy *pol = NULL;
3214 struct xfrm_state *x, *xc;
3215 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3216 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3217 struct xfrm_migrate *mp;
3218
3219 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3220 goto out;
3221
3222 /* Stage 1 - find policy */
3223 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3224 err = -ENOENT;
3225 goto out;
3226 }
3227
3228 /* Stage 2 - find and update state(s) */
3229 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3230 if ((x = xfrm_migrate_state_find(mp, net))) {
3231 x_cur[nx_cur] = x;
3232 nx_cur++;
3233 if ((xc = xfrm_state_migrate(x, mp))) {
3234 x_new[nx_new] = xc;
3235 nx_new++;
3236 } else {
3237 err = -ENODATA;
3238 goto restore_state;
3239 }
3240 }
3241 }
3242
3243 /* Stage 3 - update policy */
3244 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3245 goto restore_state;
3246
3247 /* Stage 4 - delete old state(s) */
3248 if (nx_cur) {
3249 xfrm_states_put(x_cur, nx_cur);
3250 xfrm_states_delete(x_cur, nx_cur);
3251 }
3252
3253 /* Stage 5 - announce */
3254 km_migrate(sel, dir, type, m, num_migrate, k);
3255
3256 xfrm_pol_put(pol);
3257
3258 return 0;
3259 out:
3260 return err;
3261
3262 restore_state:
3263 if (pol)
3264 xfrm_pol_put(pol);
3265 if (nx_cur)
3266 xfrm_states_put(x_cur, nx_cur);
3267 if (nx_new)
3268 xfrm_states_delete(x_new, nx_new);
3269
3270 return err;
3271 }
3272 EXPORT_SYMBOL(xfrm_migrate);
3273 #endif
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