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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 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 const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
49 __read_mostly;
50
51 static struct kmem_cache *xfrm_dst_cache __read_mostly;
52 static __read_mostly seqcount_t xfrm_policy_hash_generation;
53
54 static void xfrm_init_pmtu(struct dst_entry *dst);
55 static int stale_bundle(struct dst_entry *dst);
56 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
57 static void xfrm_policy_queue_process(unsigned long arg);
58
59 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
60 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 int dir);
62
63 static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
64 {
65 return atomic_inc_not_zero(&policy->refcnt);
66 }
67
68 static inline bool
69 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
70 {
71 const struct flowi4 *fl4 = &fl->u.ip4;
72
73 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
74 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
75 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
77 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
78 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
79 }
80
81 static inline bool
82 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
83 {
84 const struct flowi6 *fl6 = &fl->u.ip6;
85
86 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
87 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
88 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
89 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
90 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
91 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
92 }
93
94 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
95 unsigned short family)
96 {
97 switch (family) {
98 case AF_INET:
99 return __xfrm4_selector_match(sel, fl);
100 case AF_INET6:
101 return __xfrm6_selector_match(sel, fl);
102 }
103 return false;
104 }
105
106 static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
107 {
108 const struct xfrm_policy_afinfo *afinfo;
109
110 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
111 return NULL;
112 rcu_read_lock();
113 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
114 if (unlikely(!afinfo))
115 rcu_read_unlock();
116 return afinfo;
117 }
118
119 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net,
120 int tos, int oif,
121 const xfrm_address_t *saddr,
122 const xfrm_address_t *daddr,
123 int family)
124 {
125 const struct xfrm_policy_afinfo *afinfo;
126 struct dst_entry *dst;
127
128 afinfo = xfrm_policy_get_afinfo(family);
129 if (unlikely(afinfo == NULL))
130 return ERR_PTR(-EAFNOSUPPORT);
131
132 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
133
134 rcu_read_unlock();
135
136 return dst;
137 }
138
139 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
140 int tos, int oif,
141 xfrm_address_t *prev_saddr,
142 xfrm_address_t *prev_daddr,
143 int family)
144 {
145 struct net *net = xs_net(x);
146 xfrm_address_t *saddr = &x->props.saddr;
147 xfrm_address_t *daddr = &x->id.daddr;
148 struct dst_entry *dst;
149
150 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
151 saddr = x->coaddr;
152 daddr = prev_daddr;
153 }
154 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
155 saddr = prev_saddr;
156 daddr = x->coaddr;
157 }
158
159 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
160
161 if (!IS_ERR(dst)) {
162 if (prev_saddr != saddr)
163 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
164 if (prev_daddr != daddr)
165 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
166 }
167
168 return dst;
169 }
170
171 static inline unsigned long make_jiffies(long secs)
172 {
173 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
174 return MAX_SCHEDULE_TIMEOUT-1;
175 else
176 return secs*HZ;
177 }
178
179 static void xfrm_policy_timer(unsigned long data)
180 {
181 struct xfrm_policy *xp = (struct xfrm_policy *)data;
182 unsigned long now = get_seconds();
183 long next = LONG_MAX;
184 int warn = 0;
185 int dir;
186
187 read_lock(&xp->lock);
188
189 if (unlikely(xp->walk.dead))
190 goto out;
191
192 dir = xfrm_policy_id2dir(xp->index);
193
194 if (xp->lft.hard_add_expires_seconds) {
195 long tmo = xp->lft.hard_add_expires_seconds +
196 xp->curlft.add_time - now;
197 if (tmo <= 0)
198 goto expired;
199 if (tmo < next)
200 next = tmo;
201 }
202 if (xp->lft.hard_use_expires_seconds) {
203 long tmo = xp->lft.hard_use_expires_seconds +
204 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
205 if (tmo <= 0)
206 goto expired;
207 if (tmo < next)
208 next = tmo;
209 }
210 if (xp->lft.soft_add_expires_seconds) {
211 long tmo = xp->lft.soft_add_expires_seconds +
212 xp->curlft.add_time - now;
213 if (tmo <= 0) {
214 warn = 1;
215 tmo = XFRM_KM_TIMEOUT;
216 }
217 if (tmo < next)
218 next = tmo;
219 }
220 if (xp->lft.soft_use_expires_seconds) {
221 long tmo = xp->lft.soft_use_expires_seconds +
222 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
223 if (tmo <= 0) {
224 warn = 1;
225 tmo = XFRM_KM_TIMEOUT;
226 }
227 if (tmo < next)
228 next = tmo;
229 }
230
231 if (warn)
232 km_policy_expired(xp, dir, 0, 0);
233 if (next != LONG_MAX &&
234 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
235 xfrm_pol_hold(xp);
236
237 out:
238 read_unlock(&xp->lock);
239 xfrm_pol_put(xp);
240 return;
241
242 expired:
243 read_unlock(&xp->lock);
244 if (!xfrm_policy_delete(xp, dir))
245 km_policy_expired(xp, dir, 1, 0);
246 xfrm_pol_put(xp);
247 }
248
249 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
250 {
251 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
252
253 if (unlikely(pol->walk.dead))
254 flo = NULL;
255 else
256 xfrm_pol_hold(pol);
257
258 return flo;
259 }
260
261 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
262 {
263 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
264
265 return !pol->walk.dead;
266 }
267
268 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
269 {
270 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
271 }
272
273 static const struct flow_cache_ops xfrm_policy_fc_ops = {
274 .get = xfrm_policy_flo_get,
275 .check = xfrm_policy_flo_check,
276 .delete = xfrm_policy_flo_delete,
277 };
278
279 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
280 * SPD calls.
281 */
282
283 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
284 {
285 struct xfrm_policy *policy;
286
287 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
288
289 if (policy) {
290 write_pnet(&policy->xp_net, net);
291 INIT_LIST_HEAD(&policy->walk.all);
292 INIT_HLIST_NODE(&policy->bydst);
293 INIT_HLIST_NODE(&policy->byidx);
294 rwlock_init(&policy->lock);
295 atomic_set(&policy->refcnt, 1);
296 skb_queue_head_init(&policy->polq.hold_queue);
297 setup_timer(&policy->timer, xfrm_policy_timer,
298 (unsigned long)policy);
299 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
300 (unsigned long)policy);
301 policy->flo.ops = &xfrm_policy_fc_ops;
302 }
303 return policy;
304 }
305 EXPORT_SYMBOL(xfrm_policy_alloc);
306
307 static void xfrm_policy_destroy_rcu(struct rcu_head *head)
308 {
309 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
310
311 security_xfrm_policy_free(policy->security);
312 kfree(policy);
313 }
314
315 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
316
317 void xfrm_policy_destroy(struct xfrm_policy *policy)
318 {
319 BUG_ON(!policy->walk.dead);
320
321 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
322 BUG();
323
324 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
325 }
326 EXPORT_SYMBOL(xfrm_policy_destroy);
327
328 /* Rule must be locked. Release descendant resources, announce
329 * entry dead. The rule must be unlinked from lists to the moment.
330 */
331
332 static void xfrm_policy_kill(struct xfrm_policy *policy)
333 {
334 policy->walk.dead = 1;
335
336 atomic_inc(&policy->genid);
337
338 if (del_timer(&policy->polq.hold_timer))
339 xfrm_pol_put(policy);
340 skb_queue_purge(&policy->polq.hold_queue);
341
342 if (del_timer(&policy->timer))
343 xfrm_pol_put(policy);
344
345 xfrm_pol_put(policy);
346 }
347
348 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
349
350 static inline unsigned int idx_hash(struct net *net, u32 index)
351 {
352 return __idx_hash(index, net->xfrm.policy_idx_hmask);
353 }
354
355 /* calculate policy hash thresholds */
356 static void __get_hash_thresh(struct net *net,
357 unsigned short family, int dir,
358 u8 *dbits, u8 *sbits)
359 {
360 switch (family) {
361 case AF_INET:
362 *dbits = net->xfrm.policy_bydst[dir].dbits4;
363 *sbits = net->xfrm.policy_bydst[dir].sbits4;
364 break;
365
366 case AF_INET6:
367 *dbits = net->xfrm.policy_bydst[dir].dbits6;
368 *sbits = net->xfrm.policy_bydst[dir].sbits6;
369 break;
370
371 default:
372 *dbits = 0;
373 *sbits = 0;
374 }
375 }
376
377 static struct hlist_head *policy_hash_bysel(struct net *net,
378 const struct xfrm_selector *sel,
379 unsigned short family, int dir)
380 {
381 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
382 unsigned int hash;
383 u8 dbits;
384 u8 sbits;
385
386 __get_hash_thresh(net, family, dir, &dbits, &sbits);
387 hash = __sel_hash(sel, family, hmask, dbits, sbits);
388
389 if (hash == hmask + 1)
390 return &net->xfrm.policy_inexact[dir];
391
392 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
393 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
394 }
395
396 static struct hlist_head *policy_hash_direct(struct net *net,
397 const xfrm_address_t *daddr,
398 const xfrm_address_t *saddr,
399 unsigned short family, int dir)
400 {
401 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
402 unsigned int hash;
403 u8 dbits;
404 u8 sbits;
405
406 __get_hash_thresh(net, family, dir, &dbits, &sbits);
407 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
408
409 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
410 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
411 }
412
413 static void xfrm_dst_hash_transfer(struct net *net,
414 struct hlist_head *list,
415 struct hlist_head *ndsttable,
416 unsigned int nhashmask,
417 int dir)
418 {
419 struct hlist_node *tmp, *entry0 = NULL;
420 struct xfrm_policy *pol;
421 unsigned int h0 = 0;
422 u8 dbits;
423 u8 sbits;
424
425 redo:
426 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
427 unsigned int h;
428
429 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
430 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
431 pol->family, nhashmask, dbits, sbits);
432 if (!entry0) {
433 hlist_del_rcu(&pol->bydst);
434 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
435 h0 = h;
436 } else {
437 if (h != h0)
438 continue;
439 hlist_del_rcu(&pol->bydst);
440 hlist_add_behind_rcu(&pol->bydst, entry0);
441 }
442 entry0 = &pol->bydst;
443 }
444 if (!hlist_empty(list)) {
445 entry0 = NULL;
446 goto redo;
447 }
448 }
449
450 static void xfrm_idx_hash_transfer(struct hlist_head *list,
451 struct hlist_head *nidxtable,
452 unsigned int nhashmask)
453 {
454 struct hlist_node *tmp;
455 struct xfrm_policy *pol;
456
457 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
458 unsigned int h;
459
460 h = __idx_hash(pol->index, nhashmask);
461 hlist_add_head(&pol->byidx, nidxtable+h);
462 }
463 }
464
465 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
466 {
467 return ((old_hmask + 1) << 1) - 1;
468 }
469
470 static void xfrm_bydst_resize(struct net *net, int dir)
471 {
472 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
473 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
474 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
475 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
476 struct hlist_head *odst;
477 int i;
478
479 if (!ndst)
480 return;
481
482 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
483 write_seqcount_begin(&xfrm_policy_hash_generation);
484
485 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
486 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
487
488 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
489 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
490
491 for (i = hmask; i >= 0; i--)
492 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
493
494 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
495 net->xfrm.policy_bydst[dir].hmask = nhashmask;
496
497 write_seqcount_end(&xfrm_policy_hash_generation);
498 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
499
500 synchronize_rcu();
501
502 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
503 }
504
505 static void xfrm_byidx_resize(struct net *net, int total)
506 {
507 unsigned int hmask = net->xfrm.policy_idx_hmask;
508 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
509 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
510 struct hlist_head *oidx = net->xfrm.policy_byidx;
511 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
512 int i;
513
514 if (!nidx)
515 return;
516
517 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
518
519 for (i = hmask; i >= 0; i--)
520 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
521
522 net->xfrm.policy_byidx = nidx;
523 net->xfrm.policy_idx_hmask = nhashmask;
524
525 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
526
527 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
528 }
529
530 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
531 {
532 unsigned int cnt = net->xfrm.policy_count[dir];
533 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
534
535 if (total)
536 *total += cnt;
537
538 if ((hmask + 1) < xfrm_policy_hashmax &&
539 cnt > hmask)
540 return 1;
541
542 return 0;
543 }
544
545 static inline int xfrm_byidx_should_resize(struct net *net, int total)
546 {
547 unsigned int hmask = net->xfrm.policy_idx_hmask;
548
549 if ((hmask + 1) < xfrm_policy_hashmax &&
550 total > hmask)
551 return 1;
552
553 return 0;
554 }
555
556 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
557 {
558 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
559 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
560 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
561 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
562 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
563 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
564 si->spdhcnt = net->xfrm.policy_idx_hmask;
565 si->spdhmcnt = xfrm_policy_hashmax;
566 }
567 EXPORT_SYMBOL(xfrm_spd_getinfo);
568
569 static DEFINE_MUTEX(hash_resize_mutex);
570 static void xfrm_hash_resize(struct work_struct *work)
571 {
572 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
573 int dir, total;
574
575 mutex_lock(&hash_resize_mutex);
576
577 total = 0;
578 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
579 if (xfrm_bydst_should_resize(net, dir, &total))
580 xfrm_bydst_resize(net, dir);
581 }
582 if (xfrm_byidx_should_resize(net, total))
583 xfrm_byidx_resize(net, total);
584
585 mutex_unlock(&hash_resize_mutex);
586 }
587
588 static void xfrm_hash_rebuild(struct work_struct *work)
589 {
590 struct net *net = container_of(work, struct net,
591 xfrm.policy_hthresh.work);
592 unsigned int hmask;
593 struct xfrm_policy *pol;
594 struct xfrm_policy *policy;
595 struct hlist_head *chain;
596 struct hlist_head *odst;
597 struct hlist_node *newpos;
598 int i;
599 int dir;
600 unsigned seq;
601 u8 lbits4, rbits4, lbits6, rbits6;
602
603 mutex_lock(&hash_resize_mutex);
604
605 /* read selector prefixlen thresholds */
606 do {
607 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
608
609 lbits4 = net->xfrm.policy_hthresh.lbits4;
610 rbits4 = net->xfrm.policy_hthresh.rbits4;
611 lbits6 = net->xfrm.policy_hthresh.lbits6;
612 rbits6 = net->xfrm.policy_hthresh.rbits6;
613 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
614
615 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
616
617 /* reset the bydst and inexact table in all directions */
618 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
619 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
620 hmask = net->xfrm.policy_bydst[dir].hmask;
621 odst = net->xfrm.policy_bydst[dir].table;
622 for (i = hmask; i >= 0; i--)
623 INIT_HLIST_HEAD(odst + i);
624 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
625 /* dir out => dst = remote, src = local */
626 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
627 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
628 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
629 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
630 } else {
631 /* dir in/fwd => dst = local, src = remote */
632 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
633 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
634 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
635 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
636 }
637 }
638
639 /* re-insert all policies by order of creation */
640 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
641 if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
642 /* skip socket policies */
643 continue;
644 }
645 newpos = NULL;
646 chain = policy_hash_bysel(net, &policy->selector,
647 policy->family,
648 xfrm_policy_id2dir(policy->index));
649 hlist_for_each_entry(pol, chain, bydst) {
650 if (policy->priority >= pol->priority)
651 newpos = &pol->bydst;
652 else
653 break;
654 }
655 if (newpos)
656 hlist_add_behind(&policy->bydst, newpos);
657 else
658 hlist_add_head(&policy->bydst, chain);
659 }
660
661 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
662
663 mutex_unlock(&hash_resize_mutex);
664 }
665
666 void xfrm_policy_hash_rebuild(struct net *net)
667 {
668 schedule_work(&net->xfrm.policy_hthresh.work);
669 }
670 EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
671
672 /* Generate new index... KAME seems to generate them ordered by cost
673 * of an absolute inpredictability of ordering of rules. This will not pass. */
674 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
675 {
676 static u32 idx_generator;
677
678 for (;;) {
679 struct hlist_head *list;
680 struct xfrm_policy *p;
681 u32 idx;
682 int found;
683
684 if (!index) {
685 idx = (idx_generator | dir);
686 idx_generator += 8;
687 } else {
688 idx = index;
689 index = 0;
690 }
691
692 if (idx == 0)
693 idx = 8;
694 list = net->xfrm.policy_byidx + idx_hash(net, idx);
695 found = 0;
696 hlist_for_each_entry(p, list, byidx) {
697 if (p->index == idx) {
698 found = 1;
699 break;
700 }
701 }
702 if (!found)
703 return idx;
704 }
705 }
706
707 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
708 {
709 u32 *p1 = (u32 *) s1;
710 u32 *p2 = (u32 *) s2;
711 int len = sizeof(struct xfrm_selector) / sizeof(u32);
712 int i;
713
714 for (i = 0; i < len; i++) {
715 if (p1[i] != p2[i])
716 return 1;
717 }
718
719 return 0;
720 }
721
722 static void xfrm_policy_requeue(struct xfrm_policy *old,
723 struct xfrm_policy *new)
724 {
725 struct xfrm_policy_queue *pq = &old->polq;
726 struct sk_buff_head list;
727
728 if (skb_queue_empty(&pq->hold_queue))
729 return;
730
731 __skb_queue_head_init(&list);
732
733 spin_lock_bh(&pq->hold_queue.lock);
734 skb_queue_splice_init(&pq->hold_queue, &list);
735 if (del_timer(&pq->hold_timer))
736 xfrm_pol_put(old);
737 spin_unlock_bh(&pq->hold_queue.lock);
738
739 pq = &new->polq;
740
741 spin_lock_bh(&pq->hold_queue.lock);
742 skb_queue_splice(&list, &pq->hold_queue);
743 pq->timeout = XFRM_QUEUE_TMO_MIN;
744 if (!mod_timer(&pq->hold_timer, jiffies))
745 xfrm_pol_hold(new);
746 spin_unlock_bh(&pq->hold_queue.lock);
747 }
748
749 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
750 struct xfrm_policy *pol)
751 {
752 u32 mark = policy->mark.v & policy->mark.m;
753
754 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
755 return true;
756
757 if ((mark & pol->mark.m) == pol->mark.v &&
758 policy->priority == pol->priority)
759 return true;
760
761 return false;
762 }
763
764 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
765 {
766 struct net *net = xp_net(policy);
767 struct xfrm_policy *pol;
768 struct xfrm_policy *delpol;
769 struct hlist_head *chain;
770 struct hlist_node *newpos;
771
772 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
773 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
774 delpol = NULL;
775 newpos = NULL;
776 hlist_for_each_entry(pol, chain, bydst) {
777 if (pol->type == policy->type &&
778 !selector_cmp(&pol->selector, &policy->selector) &&
779 xfrm_policy_mark_match(policy, pol) &&
780 xfrm_sec_ctx_match(pol->security, policy->security) &&
781 !WARN_ON(delpol)) {
782 if (excl) {
783 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
784 return -EEXIST;
785 }
786 delpol = pol;
787 if (policy->priority > pol->priority)
788 continue;
789 } else if (policy->priority >= pol->priority) {
790 newpos = &pol->bydst;
791 continue;
792 }
793 if (delpol)
794 break;
795 }
796 if (newpos)
797 hlist_add_behind(&policy->bydst, newpos);
798 else
799 hlist_add_head(&policy->bydst, chain);
800 __xfrm_policy_link(policy, dir);
801 atomic_inc(&net->xfrm.flow_cache_genid);
802
803 /* After previous checking, family can either be AF_INET or AF_INET6 */
804 if (policy->family == AF_INET)
805 rt_genid_bump_ipv4(net);
806 else
807 rt_genid_bump_ipv6(net);
808
809 if (delpol) {
810 xfrm_policy_requeue(delpol, policy);
811 __xfrm_policy_unlink(delpol, dir);
812 }
813 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
814 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
815 policy->curlft.add_time = get_seconds();
816 policy->curlft.use_time = 0;
817 if (!mod_timer(&policy->timer, jiffies + HZ))
818 xfrm_pol_hold(policy);
819 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
820
821 if (delpol)
822 xfrm_policy_kill(delpol);
823 else if (xfrm_bydst_should_resize(net, dir, NULL))
824 schedule_work(&net->xfrm.policy_hash_work);
825
826 return 0;
827 }
828 EXPORT_SYMBOL(xfrm_policy_insert);
829
830 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
831 int dir, struct xfrm_selector *sel,
832 struct xfrm_sec_ctx *ctx, int delete,
833 int *err)
834 {
835 struct xfrm_policy *pol, *ret;
836 struct hlist_head *chain;
837
838 *err = 0;
839 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
840 chain = policy_hash_bysel(net, sel, sel->family, dir);
841 ret = NULL;
842 hlist_for_each_entry(pol, chain, bydst) {
843 if (pol->type == type &&
844 (mark & pol->mark.m) == pol->mark.v &&
845 !selector_cmp(sel, &pol->selector) &&
846 xfrm_sec_ctx_match(ctx, pol->security)) {
847 xfrm_pol_hold(pol);
848 if (delete) {
849 *err = security_xfrm_policy_delete(
850 pol->security);
851 if (*err) {
852 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
853 return pol;
854 }
855 __xfrm_policy_unlink(pol, dir);
856 }
857 ret = pol;
858 break;
859 }
860 }
861 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
862
863 if (ret && delete)
864 xfrm_policy_kill(ret);
865 return ret;
866 }
867 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
868
869 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
870 int dir, u32 id, int delete, int *err)
871 {
872 struct xfrm_policy *pol, *ret;
873 struct hlist_head *chain;
874
875 *err = -ENOENT;
876 if (xfrm_policy_id2dir(id) != dir)
877 return NULL;
878
879 *err = 0;
880 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
881 chain = net->xfrm.policy_byidx + idx_hash(net, id);
882 ret = NULL;
883 hlist_for_each_entry(pol, chain, byidx) {
884 if (pol->type == type && pol->index == id &&
885 (mark & pol->mark.m) == pol->mark.v) {
886 xfrm_pol_hold(pol);
887 if (delete) {
888 *err = security_xfrm_policy_delete(
889 pol->security);
890 if (*err) {
891 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
892 return pol;
893 }
894 __xfrm_policy_unlink(pol, dir);
895 }
896 ret = pol;
897 break;
898 }
899 }
900 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
901
902 if (ret && delete)
903 xfrm_policy_kill(ret);
904 return ret;
905 }
906 EXPORT_SYMBOL(xfrm_policy_byid);
907
908 #ifdef CONFIG_SECURITY_NETWORK_XFRM
909 static inline int
910 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
911 {
912 int dir, err = 0;
913
914 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
915 struct xfrm_policy *pol;
916 int i;
917
918 hlist_for_each_entry(pol,
919 &net->xfrm.policy_inexact[dir], bydst) {
920 if (pol->type != type)
921 continue;
922 err = security_xfrm_policy_delete(pol->security);
923 if (err) {
924 xfrm_audit_policy_delete(pol, 0, task_valid);
925 return err;
926 }
927 }
928 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
929 hlist_for_each_entry(pol,
930 net->xfrm.policy_bydst[dir].table + i,
931 bydst) {
932 if (pol->type != type)
933 continue;
934 err = security_xfrm_policy_delete(
935 pol->security);
936 if (err) {
937 xfrm_audit_policy_delete(pol, 0,
938 task_valid);
939 return err;
940 }
941 }
942 }
943 }
944 return err;
945 }
946 #else
947 static inline int
948 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
949 {
950 return 0;
951 }
952 #endif
953
954 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
955 {
956 int dir, err = 0, cnt = 0;
957
958 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
959
960 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
961 if (err)
962 goto out;
963
964 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
965 struct xfrm_policy *pol;
966 int i;
967
968 again1:
969 hlist_for_each_entry(pol,
970 &net->xfrm.policy_inexact[dir], bydst) {
971 if (pol->type != type)
972 continue;
973 __xfrm_policy_unlink(pol, dir);
974 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
975 cnt++;
976
977 xfrm_audit_policy_delete(pol, 1, task_valid);
978
979 xfrm_policy_kill(pol);
980
981 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
982 goto again1;
983 }
984
985 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
986 again2:
987 hlist_for_each_entry(pol,
988 net->xfrm.policy_bydst[dir].table + i,
989 bydst) {
990 if (pol->type != type)
991 continue;
992 __xfrm_policy_unlink(pol, dir);
993 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
994 cnt++;
995
996 xfrm_audit_policy_delete(pol, 1, task_valid);
997 xfrm_policy_kill(pol);
998
999 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1000 goto again2;
1001 }
1002 }
1003
1004 }
1005 if (!cnt)
1006 err = -ESRCH;
1007 out:
1008 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1009 return err;
1010 }
1011 EXPORT_SYMBOL(xfrm_policy_flush);
1012
1013 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1014 int (*func)(struct xfrm_policy *, int, int, void*),
1015 void *data)
1016 {
1017 struct xfrm_policy *pol;
1018 struct xfrm_policy_walk_entry *x;
1019 int error = 0;
1020
1021 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1022 walk->type != XFRM_POLICY_TYPE_ANY)
1023 return -EINVAL;
1024
1025 if (list_empty(&walk->walk.all) && walk->seq != 0)
1026 return 0;
1027
1028 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1029 if (list_empty(&walk->walk.all))
1030 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
1031 else
1032 x = list_first_entry(&walk->walk.all,
1033 struct xfrm_policy_walk_entry, all);
1034
1035 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
1036 if (x->dead)
1037 continue;
1038 pol = container_of(x, struct xfrm_policy, walk);
1039 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1040 walk->type != pol->type)
1041 continue;
1042 error = func(pol, xfrm_policy_id2dir(pol->index),
1043 walk->seq, data);
1044 if (error) {
1045 list_move_tail(&walk->walk.all, &x->all);
1046 goto out;
1047 }
1048 walk->seq++;
1049 }
1050 if (walk->seq == 0) {
1051 error = -ENOENT;
1052 goto out;
1053 }
1054 list_del_init(&walk->walk.all);
1055 out:
1056 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1057 return error;
1058 }
1059 EXPORT_SYMBOL(xfrm_policy_walk);
1060
1061 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1062 {
1063 INIT_LIST_HEAD(&walk->walk.all);
1064 walk->walk.dead = 1;
1065 walk->type = type;
1066 walk->seq = 0;
1067 }
1068 EXPORT_SYMBOL(xfrm_policy_walk_init);
1069
1070 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
1071 {
1072 if (list_empty(&walk->walk.all))
1073 return;
1074
1075 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
1076 list_del(&walk->walk.all);
1077 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1078 }
1079 EXPORT_SYMBOL(xfrm_policy_walk_done);
1080
1081 /*
1082 * Find policy to apply to this flow.
1083 *
1084 * Returns 0 if policy found, else an -errno.
1085 */
1086 static int xfrm_policy_match(const struct xfrm_policy *pol,
1087 const struct flowi *fl,
1088 u8 type, u16 family, int dir)
1089 {
1090 const struct xfrm_selector *sel = &pol->selector;
1091 int ret = -ESRCH;
1092 bool match;
1093
1094 if (pol->family != family ||
1095 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
1096 pol->type != type)
1097 return ret;
1098
1099 match = xfrm_selector_match(sel, fl, family);
1100 if (match)
1101 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
1102 dir);
1103
1104 return ret;
1105 }
1106
1107 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
1108 const struct flowi *fl,
1109 u16 family, u8 dir)
1110 {
1111 int err;
1112 struct xfrm_policy *pol, *ret;
1113 const xfrm_address_t *daddr, *saddr;
1114 struct hlist_head *chain;
1115 unsigned int sequence;
1116 u32 priority;
1117
1118 daddr = xfrm_flowi_daddr(fl, family);
1119 saddr = xfrm_flowi_saddr(fl, family);
1120 if (unlikely(!daddr || !saddr))
1121 return NULL;
1122
1123 rcu_read_lock();
1124 retry:
1125 do {
1126 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1127 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1128 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1129
1130 priority = ~0U;
1131 ret = NULL;
1132 hlist_for_each_entry_rcu(pol, chain, bydst) {
1133 err = xfrm_policy_match(pol, fl, type, family, dir);
1134 if (err) {
1135 if (err == -ESRCH)
1136 continue;
1137 else {
1138 ret = ERR_PTR(err);
1139 goto fail;
1140 }
1141 } else {
1142 ret = pol;
1143 priority = ret->priority;
1144 break;
1145 }
1146 }
1147 chain = &net->xfrm.policy_inexact[dir];
1148 hlist_for_each_entry_rcu(pol, chain, bydst) {
1149 if ((pol->priority >= priority) && ret)
1150 break;
1151
1152 err = xfrm_policy_match(pol, fl, type, family, dir);
1153 if (err) {
1154 if (err == -ESRCH)
1155 continue;
1156 else {
1157 ret = ERR_PTR(err);
1158 goto fail;
1159 }
1160 } else {
1161 ret = pol;
1162 break;
1163 }
1164 }
1165
1166 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1167 goto retry;
1168
1169 if (ret && !xfrm_pol_hold_rcu(ret))
1170 goto retry;
1171 fail:
1172 rcu_read_unlock();
1173
1174 return ret;
1175 }
1176
1177 static struct xfrm_policy *
1178 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1179 {
1180 #ifdef CONFIG_XFRM_SUB_POLICY
1181 struct xfrm_policy *pol;
1182
1183 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1184 if (pol != NULL)
1185 return pol;
1186 #endif
1187 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1188 }
1189
1190 static int flow_to_policy_dir(int dir)
1191 {
1192 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1193 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1194 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1195 return dir;
1196
1197 switch (dir) {
1198 default:
1199 case FLOW_DIR_IN:
1200 return XFRM_POLICY_IN;
1201 case FLOW_DIR_OUT:
1202 return XFRM_POLICY_OUT;
1203 case FLOW_DIR_FWD:
1204 return XFRM_POLICY_FWD;
1205 }
1206 }
1207
1208 static struct flow_cache_object *
1209 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1210 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1211 {
1212 struct xfrm_policy *pol;
1213
1214 if (old_obj)
1215 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1216
1217 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1218 if (IS_ERR_OR_NULL(pol))
1219 return ERR_CAST(pol);
1220
1221 /* Resolver returns two references:
1222 * one for cache and one for caller of flow_cache_lookup() */
1223 xfrm_pol_hold(pol);
1224
1225 return &pol->flo;
1226 }
1227
1228 static inline int policy_to_flow_dir(int dir)
1229 {
1230 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1231 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1232 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1233 return dir;
1234 switch (dir) {
1235 default:
1236 case XFRM_POLICY_IN:
1237 return FLOW_DIR_IN;
1238 case XFRM_POLICY_OUT:
1239 return FLOW_DIR_OUT;
1240 case XFRM_POLICY_FWD:
1241 return FLOW_DIR_FWD;
1242 }
1243 }
1244
1245 static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
1246 const struct flowi *fl, u16 family)
1247 {
1248 struct xfrm_policy *pol;
1249
1250 rcu_read_lock();
1251 again:
1252 pol = rcu_dereference(sk->sk_policy[dir]);
1253 if (pol != NULL) {
1254 bool match = xfrm_selector_match(&pol->selector, fl, family);
1255 int err = 0;
1256
1257 if (match) {
1258 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1259 pol = NULL;
1260 goto out;
1261 }
1262 err = security_xfrm_policy_lookup(pol->security,
1263 fl->flowi_secid,
1264 policy_to_flow_dir(dir));
1265 if (!err) {
1266 if (!xfrm_pol_hold_rcu(pol))
1267 goto again;
1268 } else if (err == -ESRCH) {
1269 pol = NULL;
1270 } else {
1271 pol = ERR_PTR(err);
1272 }
1273 } else
1274 pol = NULL;
1275 }
1276 out:
1277 rcu_read_unlock();
1278 return pol;
1279 }
1280
1281 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1282 {
1283 struct net *net = xp_net(pol);
1284
1285 list_add(&pol->walk.all, &net->xfrm.policy_all);
1286 net->xfrm.policy_count[dir]++;
1287 xfrm_pol_hold(pol);
1288 }
1289
1290 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1291 int dir)
1292 {
1293 struct net *net = xp_net(pol);
1294
1295 if (list_empty(&pol->walk.all))
1296 return NULL;
1297
1298 /* Socket policies are not hashed. */
1299 if (!hlist_unhashed(&pol->bydst)) {
1300 hlist_del_rcu(&pol->bydst);
1301 hlist_del(&pol->byidx);
1302 }
1303
1304 list_del_init(&pol->walk.all);
1305 net->xfrm.policy_count[dir]--;
1306
1307 return pol;
1308 }
1309
1310 static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1311 {
1312 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1313 }
1314
1315 static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1316 {
1317 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1318 }
1319
1320 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1321 {
1322 struct net *net = xp_net(pol);
1323
1324 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1325 pol = __xfrm_policy_unlink(pol, dir);
1326 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1327 if (pol) {
1328 xfrm_policy_kill(pol);
1329 return 0;
1330 }
1331 return -ENOENT;
1332 }
1333 EXPORT_SYMBOL(xfrm_policy_delete);
1334
1335 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1336 {
1337 struct net *net = xp_net(pol);
1338 struct xfrm_policy *old_pol;
1339
1340 #ifdef CONFIG_XFRM_SUB_POLICY
1341 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1342 return -EINVAL;
1343 #endif
1344
1345 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1346 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1347 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1348 if (pol) {
1349 pol->curlft.add_time = get_seconds();
1350 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1351 xfrm_sk_policy_link(pol, dir);
1352 }
1353 rcu_assign_pointer(sk->sk_policy[dir], pol);
1354 if (old_pol) {
1355 if (pol)
1356 xfrm_policy_requeue(old_pol, pol);
1357
1358 /* Unlinking succeeds always. This is the only function
1359 * allowed to delete or replace socket policy.
1360 */
1361 xfrm_sk_policy_unlink(old_pol, dir);
1362 }
1363 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1364
1365 if (old_pol) {
1366 xfrm_policy_kill(old_pol);
1367 }
1368 return 0;
1369 }
1370
1371 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1372 {
1373 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1374 struct net *net = xp_net(old);
1375
1376 if (newp) {
1377 newp->selector = old->selector;
1378 if (security_xfrm_policy_clone(old->security,
1379 &newp->security)) {
1380 kfree(newp);
1381 return NULL; /* ENOMEM */
1382 }
1383 newp->lft = old->lft;
1384 newp->curlft = old->curlft;
1385 newp->mark = old->mark;
1386 newp->action = old->action;
1387 newp->flags = old->flags;
1388 newp->xfrm_nr = old->xfrm_nr;
1389 newp->index = old->index;
1390 newp->type = old->type;
1391 memcpy(newp->xfrm_vec, old->xfrm_vec,
1392 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1393 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1394 xfrm_sk_policy_link(newp, dir);
1395 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1396 xfrm_pol_put(newp);
1397 }
1398 return newp;
1399 }
1400
1401 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1402 {
1403 const struct xfrm_policy *p;
1404 struct xfrm_policy *np;
1405 int i, ret = 0;
1406
1407 rcu_read_lock();
1408 for (i = 0; i < 2; i++) {
1409 p = rcu_dereference(osk->sk_policy[i]);
1410 if (p) {
1411 np = clone_policy(p, i);
1412 if (unlikely(!np)) {
1413 ret = -ENOMEM;
1414 break;
1415 }
1416 rcu_assign_pointer(sk->sk_policy[i], np);
1417 }
1418 }
1419 rcu_read_unlock();
1420 return ret;
1421 }
1422
1423 static int
1424 xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1425 xfrm_address_t *remote, unsigned short family)
1426 {
1427 int err;
1428 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1429
1430 if (unlikely(afinfo == NULL))
1431 return -EINVAL;
1432 err = afinfo->get_saddr(net, oif, local, remote);
1433 rcu_read_unlock();
1434 return err;
1435 }
1436
1437 /* Resolve list of templates for the flow, given policy. */
1438
1439 static int
1440 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1441 struct xfrm_state **xfrm, unsigned short family)
1442 {
1443 struct net *net = xp_net(policy);
1444 int nx;
1445 int i, error;
1446 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1447 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1448 xfrm_address_t tmp;
1449
1450 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1451 struct xfrm_state *x;
1452 xfrm_address_t *remote = daddr;
1453 xfrm_address_t *local = saddr;
1454 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1455
1456 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1457 tmpl->mode == XFRM_MODE_BEET) {
1458 remote = &tmpl->id.daddr;
1459 local = &tmpl->saddr;
1460 if (xfrm_addr_any(local, tmpl->encap_family)) {
1461 error = xfrm_get_saddr(net, fl->flowi_oif,
1462 &tmp, remote,
1463 tmpl->encap_family);
1464 if (error)
1465 goto fail;
1466 local = &tmp;
1467 }
1468 }
1469
1470 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1471
1472 if (x && x->km.state == XFRM_STATE_VALID) {
1473 xfrm[nx++] = x;
1474 daddr = remote;
1475 saddr = local;
1476 continue;
1477 }
1478 if (x) {
1479 error = (x->km.state == XFRM_STATE_ERROR ?
1480 -EINVAL : -EAGAIN);
1481 xfrm_state_put(x);
1482 } else if (error == -ESRCH) {
1483 error = -EAGAIN;
1484 }
1485
1486 if (!tmpl->optional)
1487 goto fail;
1488 }
1489 return nx;
1490
1491 fail:
1492 for (nx--; nx >= 0; nx--)
1493 xfrm_state_put(xfrm[nx]);
1494 return error;
1495 }
1496
1497 static int
1498 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1499 struct xfrm_state **xfrm, unsigned short family)
1500 {
1501 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1502 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1503 int cnx = 0;
1504 int error;
1505 int ret;
1506 int i;
1507
1508 for (i = 0; i < npols; i++) {
1509 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1510 error = -ENOBUFS;
1511 goto fail;
1512 }
1513
1514 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1515 if (ret < 0) {
1516 error = ret;
1517 goto fail;
1518 } else
1519 cnx += ret;
1520 }
1521
1522 /* found states are sorted for outbound processing */
1523 if (npols > 1)
1524 xfrm_state_sort(xfrm, tpp, cnx, family);
1525
1526 return cnx;
1527
1528 fail:
1529 for (cnx--; cnx >= 0; cnx--)
1530 xfrm_state_put(tpp[cnx]);
1531 return error;
1532
1533 }
1534
1535 static int xfrm_get_tos(const struct flowi *fl, int family)
1536 {
1537 const struct xfrm_policy_afinfo *afinfo;
1538 int tos = 0;
1539
1540 afinfo = xfrm_policy_get_afinfo(family);
1541 tos = afinfo ? afinfo->get_tos(fl) : 0;
1542
1543 rcu_read_unlock();
1544
1545 return tos;
1546 }
1547
1548 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1549 {
1550 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1551 struct dst_entry *dst = &xdst->u.dst;
1552
1553 if (xdst->route == NULL) {
1554 /* Dummy bundle - if it has xfrms we were not
1555 * able to build bundle as template resolution failed.
1556 * It means we need to try again resolving. */
1557 if (xdst->num_xfrms > 0)
1558 return NULL;
1559 } else if (dst->flags & DST_XFRM_QUEUE) {
1560 return NULL;
1561 } else {
1562 /* Real bundle */
1563 if (stale_bundle(dst))
1564 return NULL;
1565 }
1566
1567 dst_hold(dst);
1568 return flo;
1569 }
1570
1571 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1572 {
1573 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1574 struct dst_entry *dst = &xdst->u.dst;
1575
1576 if (!xdst->route)
1577 return 0;
1578 if (stale_bundle(dst))
1579 return 0;
1580
1581 return 1;
1582 }
1583
1584 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1585 {
1586 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1587 struct dst_entry *dst = &xdst->u.dst;
1588
1589 dst_free(dst);
1590 }
1591
1592 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1593 .get = xfrm_bundle_flo_get,
1594 .check = xfrm_bundle_flo_check,
1595 .delete = xfrm_bundle_flo_delete,
1596 };
1597
1598 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1599 {
1600 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1601 struct dst_ops *dst_ops;
1602 struct xfrm_dst *xdst;
1603
1604 if (!afinfo)
1605 return ERR_PTR(-EINVAL);
1606
1607 switch (family) {
1608 case AF_INET:
1609 dst_ops = &net->xfrm.xfrm4_dst_ops;
1610 break;
1611 #if IS_ENABLED(CONFIG_IPV6)
1612 case AF_INET6:
1613 dst_ops = &net->xfrm.xfrm6_dst_ops;
1614 break;
1615 #endif
1616 default:
1617 BUG();
1618 }
1619 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1620
1621 if (likely(xdst)) {
1622 struct dst_entry *dst = &xdst->u.dst;
1623
1624 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1625 xdst->flo.ops = &xfrm_bundle_fc_ops;
1626 } else
1627 xdst = ERR_PTR(-ENOBUFS);
1628
1629 rcu_read_unlock();
1630
1631 return xdst;
1632 }
1633
1634 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1635 int nfheader_len)
1636 {
1637 const struct xfrm_policy_afinfo *afinfo =
1638 xfrm_policy_get_afinfo(dst->ops->family);
1639 int err;
1640
1641 if (!afinfo)
1642 return -EINVAL;
1643
1644 err = afinfo->init_path(path, dst, nfheader_len);
1645
1646 rcu_read_unlock();
1647
1648 return err;
1649 }
1650
1651 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1652 const struct flowi *fl)
1653 {
1654 const struct xfrm_policy_afinfo *afinfo =
1655 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1656 int err;
1657
1658 if (!afinfo)
1659 return -EINVAL;
1660
1661 err = afinfo->fill_dst(xdst, dev, fl);
1662
1663 rcu_read_unlock();
1664
1665 return err;
1666 }
1667
1668
1669 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1670 * all the metrics... Shortly, bundle a bundle.
1671 */
1672
1673 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1674 struct xfrm_state **xfrm, int nx,
1675 const struct flowi *fl,
1676 struct dst_entry *dst)
1677 {
1678 struct net *net = xp_net(policy);
1679 unsigned long now = jiffies;
1680 struct net_device *dev;
1681 struct xfrm_mode *inner_mode;
1682 struct dst_entry *dst_prev = NULL;
1683 struct dst_entry *dst0 = NULL;
1684 int i = 0;
1685 int err;
1686 int header_len = 0;
1687 int nfheader_len = 0;
1688 int trailer_len = 0;
1689 int tos;
1690 int family = policy->selector.family;
1691 xfrm_address_t saddr, daddr;
1692
1693 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1694
1695 tos = xfrm_get_tos(fl, family);
1696
1697 dst_hold(dst);
1698
1699 for (; i < nx; i++) {
1700 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1701 struct dst_entry *dst1 = &xdst->u.dst;
1702
1703 err = PTR_ERR(xdst);
1704 if (IS_ERR(xdst)) {
1705 dst_release(dst);
1706 goto put_states;
1707 }
1708
1709 if (xfrm[i]->sel.family == AF_UNSPEC) {
1710 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1711 xfrm_af2proto(family));
1712 if (!inner_mode) {
1713 err = -EAFNOSUPPORT;
1714 dst_release(dst);
1715 goto put_states;
1716 }
1717 } else
1718 inner_mode = xfrm[i]->inner_mode;
1719
1720 if (!dst_prev)
1721 dst0 = dst1;
1722 else {
1723 dst_prev->child = dst_clone(dst1);
1724 dst1->flags |= DST_NOHASH;
1725 }
1726
1727 xdst->route = dst;
1728 dst_copy_metrics(dst1, dst);
1729
1730 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1731 family = xfrm[i]->props.family;
1732 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1733 &saddr, &daddr, family);
1734 err = PTR_ERR(dst);
1735 if (IS_ERR(dst))
1736 goto put_states;
1737 } else
1738 dst_hold(dst);
1739
1740 dst1->xfrm = xfrm[i];
1741 xdst->xfrm_genid = xfrm[i]->genid;
1742
1743 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1744 dst1->flags |= DST_HOST;
1745 dst1->lastuse = now;
1746
1747 dst1->input = dst_discard;
1748 dst1->output = inner_mode->afinfo->output;
1749
1750 dst1->next = dst_prev;
1751 dst_prev = dst1;
1752
1753 header_len += xfrm[i]->props.header_len;
1754 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1755 nfheader_len += xfrm[i]->props.header_len;
1756 trailer_len += xfrm[i]->props.trailer_len;
1757 }
1758
1759 dst_prev->child = dst;
1760 dst0->path = dst;
1761
1762 err = -ENODEV;
1763 dev = dst->dev;
1764 if (!dev)
1765 goto free_dst;
1766
1767 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1768 xfrm_init_pmtu(dst_prev);
1769
1770 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1771 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1772
1773 err = xfrm_fill_dst(xdst, dev, fl);
1774 if (err)
1775 goto free_dst;
1776
1777 dst_prev->header_len = header_len;
1778 dst_prev->trailer_len = trailer_len;
1779 header_len -= xdst->u.dst.xfrm->props.header_len;
1780 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1781 }
1782
1783 out:
1784 return dst0;
1785
1786 put_states:
1787 for (; i < nx; i++)
1788 xfrm_state_put(xfrm[i]);
1789 free_dst:
1790 if (dst0)
1791 dst_free(dst0);
1792 dst0 = ERR_PTR(err);
1793 goto out;
1794 }
1795
1796 #ifdef CONFIG_XFRM_SUB_POLICY
1797 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1798 {
1799 if (!*target) {
1800 *target = kmalloc(size, GFP_ATOMIC);
1801 if (!*target)
1802 return -ENOMEM;
1803 }
1804
1805 memcpy(*target, src, size);
1806 return 0;
1807 }
1808 #endif
1809
1810 static int xfrm_dst_update_parent(struct dst_entry *dst,
1811 const struct xfrm_selector *sel)
1812 {
1813 #ifdef CONFIG_XFRM_SUB_POLICY
1814 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1815 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1816 sel, sizeof(*sel));
1817 #else
1818 return 0;
1819 #endif
1820 }
1821
1822 static int xfrm_dst_update_origin(struct dst_entry *dst,
1823 const struct flowi *fl)
1824 {
1825 #ifdef CONFIG_XFRM_SUB_POLICY
1826 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1827 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1828 #else
1829 return 0;
1830 #endif
1831 }
1832
1833 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1834 struct xfrm_policy **pols,
1835 int *num_pols, int *num_xfrms)
1836 {
1837 int i;
1838
1839 if (*num_pols == 0 || !pols[0]) {
1840 *num_pols = 0;
1841 *num_xfrms = 0;
1842 return 0;
1843 }
1844 if (IS_ERR(pols[0]))
1845 return PTR_ERR(pols[0]);
1846
1847 *num_xfrms = pols[0]->xfrm_nr;
1848
1849 #ifdef CONFIG_XFRM_SUB_POLICY
1850 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1851 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1852 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1853 XFRM_POLICY_TYPE_MAIN,
1854 fl, family,
1855 XFRM_POLICY_OUT);
1856 if (pols[1]) {
1857 if (IS_ERR(pols[1])) {
1858 xfrm_pols_put(pols, *num_pols);
1859 return PTR_ERR(pols[1]);
1860 }
1861 (*num_pols)++;
1862 (*num_xfrms) += pols[1]->xfrm_nr;
1863 }
1864 }
1865 #endif
1866 for (i = 0; i < *num_pols; i++) {
1867 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1868 *num_xfrms = -1;
1869 break;
1870 }
1871 }
1872
1873 return 0;
1874
1875 }
1876
1877 static struct xfrm_dst *
1878 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1879 const struct flowi *fl, u16 family,
1880 struct dst_entry *dst_orig)
1881 {
1882 struct net *net = xp_net(pols[0]);
1883 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1884 struct dst_entry *dst;
1885 struct xfrm_dst *xdst;
1886 int err;
1887
1888 /* Try to instantiate a bundle */
1889 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1890 if (err <= 0) {
1891 if (err != 0 && err != -EAGAIN)
1892 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1893 return ERR_PTR(err);
1894 }
1895
1896 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1897 if (IS_ERR(dst)) {
1898 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1899 return ERR_CAST(dst);
1900 }
1901
1902 xdst = (struct xfrm_dst *)dst;
1903 xdst->num_xfrms = err;
1904 if (num_pols > 1)
1905 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1906 else
1907 err = xfrm_dst_update_origin(dst, fl);
1908 if (unlikely(err)) {
1909 dst_free(dst);
1910 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1911 return ERR_PTR(err);
1912 }
1913
1914 xdst->num_pols = num_pols;
1915 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1916 xdst->policy_genid = atomic_read(&pols[0]->genid);
1917
1918 return xdst;
1919 }
1920
1921 static void xfrm_policy_queue_process(unsigned long arg)
1922 {
1923 struct sk_buff *skb;
1924 struct sock *sk;
1925 struct dst_entry *dst;
1926 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1927 struct net *net = xp_net(pol);
1928 struct xfrm_policy_queue *pq = &pol->polq;
1929 struct flowi fl;
1930 struct sk_buff_head list;
1931
1932 spin_lock(&pq->hold_queue.lock);
1933 skb = skb_peek(&pq->hold_queue);
1934 if (!skb) {
1935 spin_unlock(&pq->hold_queue.lock);
1936 goto out;
1937 }
1938 dst = skb_dst(skb);
1939 sk = skb->sk;
1940 xfrm_decode_session(skb, &fl, dst->ops->family);
1941 spin_unlock(&pq->hold_queue.lock);
1942
1943 dst_hold(dst->path);
1944 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
1945 if (IS_ERR(dst))
1946 goto purge_queue;
1947
1948 if (dst->flags & DST_XFRM_QUEUE) {
1949 dst_release(dst);
1950
1951 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1952 goto purge_queue;
1953
1954 pq->timeout = pq->timeout << 1;
1955 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1956 xfrm_pol_hold(pol);
1957 goto out;
1958 }
1959
1960 dst_release(dst);
1961
1962 __skb_queue_head_init(&list);
1963
1964 spin_lock(&pq->hold_queue.lock);
1965 pq->timeout = 0;
1966 skb_queue_splice_init(&pq->hold_queue, &list);
1967 spin_unlock(&pq->hold_queue.lock);
1968
1969 while (!skb_queue_empty(&list)) {
1970 skb = __skb_dequeue(&list);
1971
1972 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1973 dst_hold(skb_dst(skb)->path);
1974 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
1975 if (IS_ERR(dst)) {
1976 kfree_skb(skb);
1977 continue;
1978 }
1979
1980 nf_reset(skb);
1981 skb_dst_drop(skb);
1982 skb_dst_set(skb, dst);
1983
1984 dst_output(net, skb->sk, skb);
1985 }
1986
1987 out:
1988 xfrm_pol_put(pol);
1989 return;
1990
1991 purge_queue:
1992 pq->timeout = 0;
1993 skb_queue_purge(&pq->hold_queue);
1994 xfrm_pol_put(pol);
1995 }
1996
1997 static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
1998 {
1999 unsigned long sched_next;
2000 struct dst_entry *dst = skb_dst(skb);
2001 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
2002 struct xfrm_policy *pol = xdst->pols[0];
2003 struct xfrm_policy_queue *pq = &pol->polq;
2004
2005 if (unlikely(skb_fclone_busy(sk, skb))) {
2006 kfree_skb(skb);
2007 return 0;
2008 }
2009
2010 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
2011 kfree_skb(skb);
2012 return -EAGAIN;
2013 }
2014
2015 skb_dst_force(skb);
2016
2017 spin_lock_bh(&pq->hold_queue.lock);
2018
2019 if (!pq->timeout)
2020 pq->timeout = XFRM_QUEUE_TMO_MIN;
2021
2022 sched_next = jiffies + pq->timeout;
2023
2024 if (del_timer(&pq->hold_timer)) {
2025 if (time_before(pq->hold_timer.expires, sched_next))
2026 sched_next = pq->hold_timer.expires;
2027 xfrm_pol_put(pol);
2028 }
2029
2030 __skb_queue_tail(&pq->hold_queue, skb);
2031 if (!mod_timer(&pq->hold_timer, sched_next))
2032 xfrm_pol_hold(pol);
2033
2034 spin_unlock_bh(&pq->hold_queue.lock);
2035
2036 return 0;
2037 }
2038
2039 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
2040 struct xfrm_flo *xflo,
2041 const struct flowi *fl,
2042 int num_xfrms,
2043 u16 family)
2044 {
2045 int err;
2046 struct net_device *dev;
2047 struct dst_entry *dst;
2048 struct dst_entry *dst1;
2049 struct xfrm_dst *xdst;
2050
2051 xdst = xfrm_alloc_dst(net, family);
2052 if (IS_ERR(xdst))
2053 return xdst;
2054
2055 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2056 net->xfrm.sysctl_larval_drop ||
2057 num_xfrms <= 0)
2058 return xdst;
2059
2060 dst = xflo->dst_orig;
2061 dst1 = &xdst->u.dst;
2062 dst_hold(dst);
2063 xdst->route = dst;
2064
2065 dst_copy_metrics(dst1, dst);
2066
2067 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2068 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2069 dst1->lastuse = jiffies;
2070
2071 dst1->input = dst_discard;
2072 dst1->output = xdst_queue_output;
2073
2074 dst_hold(dst);
2075 dst1->child = dst;
2076 dst1->path = dst;
2077
2078 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2079
2080 err = -ENODEV;
2081 dev = dst->dev;
2082 if (!dev)
2083 goto free_dst;
2084
2085 err = xfrm_fill_dst(xdst, dev, fl);
2086 if (err)
2087 goto free_dst;
2088
2089 out:
2090 return xdst;
2091
2092 free_dst:
2093 dst_release(dst1);
2094 xdst = ERR_PTR(err);
2095 goto out;
2096 }
2097
2098 static struct flow_cache_object *
2099 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
2100 struct flow_cache_object *oldflo, void *ctx)
2101 {
2102 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
2103 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2104 struct xfrm_dst *xdst, *new_xdst;
2105 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2106
2107 /* Check if the policies from old bundle are usable */
2108 xdst = NULL;
2109 if (oldflo) {
2110 xdst = container_of(oldflo, struct xfrm_dst, flo);
2111 num_pols = xdst->num_pols;
2112 num_xfrms = xdst->num_xfrms;
2113 pol_dead = 0;
2114 for (i = 0; i < num_pols; i++) {
2115 pols[i] = xdst->pols[i];
2116 pol_dead |= pols[i]->walk.dead;
2117 }
2118 if (pol_dead) {
2119 dst_free(&xdst->u.dst);
2120 xdst = NULL;
2121 num_pols = 0;
2122 num_xfrms = 0;
2123 oldflo = NULL;
2124 }
2125 }
2126
2127 /* Resolve policies to use if we couldn't get them from
2128 * previous cache entry */
2129 if (xdst == NULL) {
2130 num_pols = 1;
2131 pols[0] = __xfrm_policy_lookup(net, fl, family,
2132 flow_to_policy_dir(dir));
2133 err = xfrm_expand_policies(fl, family, pols,
2134 &num_pols, &num_xfrms);
2135 if (err < 0)
2136 goto inc_error;
2137 if (num_pols == 0)
2138 return NULL;
2139 if (num_xfrms <= 0)
2140 goto make_dummy_bundle;
2141 }
2142
2143 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2144 xflo->dst_orig);
2145 if (IS_ERR(new_xdst)) {
2146 err = PTR_ERR(new_xdst);
2147 if (err != -EAGAIN)
2148 goto error;
2149 if (oldflo == NULL)
2150 goto make_dummy_bundle;
2151 dst_hold(&xdst->u.dst);
2152 return oldflo;
2153 } else if (new_xdst == NULL) {
2154 num_xfrms = 0;
2155 if (oldflo == NULL)
2156 goto make_dummy_bundle;
2157 xdst->num_xfrms = 0;
2158 dst_hold(&xdst->u.dst);
2159 return oldflo;
2160 }
2161
2162 /* Kill the previous bundle */
2163 if (xdst) {
2164 /* The policies were stolen for newly generated bundle */
2165 xdst->num_pols = 0;
2166 dst_free(&xdst->u.dst);
2167 }
2168
2169 /* Flow cache does not have reference, it dst_free()'s,
2170 * but we do need to return one reference for original caller */
2171 dst_hold(&new_xdst->u.dst);
2172 return &new_xdst->flo;
2173
2174 make_dummy_bundle:
2175 /* We found policies, but there's no bundles to instantiate:
2176 * either because the policy blocks, has no transformations or
2177 * we could not build template (no xfrm_states).*/
2178 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2179 if (IS_ERR(xdst)) {
2180 xfrm_pols_put(pols, num_pols);
2181 return ERR_CAST(xdst);
2182 }
2183 xdst->num_pols = num_pols;
2184 xdst->num_xfrms = num_xfrms;
2185 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2186
2187 dst_hold(&xdst->u.dst);
2188 return &xdst->flo;
2189
2190 inc_error:
2191 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2192 error:
2193 if (xdst != NULL)
2194 dst_free(&xdst->u.dst);
2195 else
2196 xfrm_pols_put(pols, num_pols);
2197 return ERR_PTR(err);
2198 }
2199
2200 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2201 struct dst_entry *dst_orig)
2202 {
2203 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2204 struct dst_entry *ret;
2205
2206 if (!afinfo) {
2207 dst_release(dst_orig);
2208 return ERR_PTR(-EINVAL);
2209 } else {
2210 ret = afinfo->blackhole_route(net, dst_orig);
2211 }
2212 rcu_read_unlock();
2213
2214 return ret;
2215 }
2216
2217 /* Main function: finds/creates a bundle for given flow.
2218 *
2219 * At the moment we eat a raw IP route. Mostly to speed up lookups
2220 * on interfaces with disabled IPsec.
2221 */
2222 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2223 const struct flowi *fl,
2224 const struct sock *sk, int flags)
2225 {
2226 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2227 struct flow_cache_object *flo;
2228 struct xfrm_dst *xdst;
2229 struct dst_entry *dst, *route;
2230 u16 family = dst_orig->ops->family;
2231 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2232 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2233
2234 dst = NULL;
2235 xdst = NULL;
2236 route = NULL;
2237
2238 sk = sk_const_to_full_sk(sk);
2239 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2240 num_pols = 1;
2241 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
2242 err = xfrm_expand_policies(fl, family, pols,
2243 &num_pols, &num_xfrms);
2244 if (err < 0)
2245 goto dropdst;
2246
2247 if (num_pols) {
2248 if (num_xfrms <= 0) {
2249 drop_pols = num_pols;
2250 goto no_transform;
2251 }
2252
2253 xdst = xfrm_resolve_and_create_bundle(
2254 pols, num_pols, fl,
2255 family, dst_orig);
2256 if (IS_ERR(xdst)) {
2257 xfrm_pols_put(pols, num_pols);
2258 err = PTR_ERR(xdst);
2259 goto dropdst;
2260 } else if (xdst == NULL) {
2261 num_xfrms = 0;
2262 drop_pols = num_pols;
2263 goto no_transform;
2264 }
2265
2266 dst_hold(&xdst->u.dst);
2267 xdst->u.dst.flags |= DST_NOCACHE;
2268 route = xdst->route;
2269 }
2270 }
2271
2272 if (xdst == NULL) {
2273 struct xfrm_flo xflo;
2274
2275 xflo.dst_orig = dst_orig;
2276 xflo.flags = flags;
2277
2278 /* To accelerate a bit... */
2279 if ((dst_orig->flags & DST_NOXFRM) ||
2280 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2281 goto nopol;
2282
2283 flo = flow_cache_lookup(net, fl, family, dir,
2284 xfrm_bundle_lookup, &xflo);
2285 if (flo == NULL)
2286 goto nopol;
2287 if (IS_ERR(flo)) {
2288 err = PTR_ERR(flo);
2289 goto dropdst;
2290 }
2291 xdst = container_of(flo, struct xfrm_dst, flo);
2292
2293 num_pols = xdst->num_pols;
2294 num_xfrms = xdst->num_xfrms;
2295 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2296 route = xdst->route;
2297 }
2298
2299 dst = &xdst->u.dst;
2300 if (route == NULL && num_xfrms > 0) {
2301 /* The only case when xfrm_bundle_lookup() returns a
2302 * bundle with null route, is when the template could
2303 * not be resolved. It means policies are there, but
2304 * bundle could not be created, since we don't yet
2305 * have the xfrm_state's. We need to wait for KM to
2306 * negotiate new SA's or bail out with error.*/
2307 if (net->xfrm.sysctl_larval_drop) {
2308 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2309 err = -EREMOTE;
2310 goto error;
2311 }
2312
2313 err = -EAGAIN;
2314
2315 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2316 goto error;
2317 }
2318
2319 no_transform:
2320 if (num_pols == 0)
2321 goto nopol;
2322
2323 if ((flags & XFRM_LOOKUP_ICMP) &&
2324 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2325 err = -ENOENT;
2326 goto error;
2327 }
2328
2329 for (i = 0; i < num_pols; i++)
2330 pols[i]->curlft.use_time = get_seconds();
2331
2332 if (num_xfrms < 0) {
2333 /* Prohibit the flow */
2334 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2335 err = -EPERM;
2336 goto error;
2337 } else if (num_xfrms > 0) {
2338 /* Flow transformed */
2339 dst_release(dst_orig);
2340 } else {
2341 /* Flow passes untransformed */
2342 dst_release(dst);
2343 dst = dst_orig;
2344 }
2345 ok:
2346 xfrm_pols_put(pols, drop_pols);
2347 if (dst && dst->xfrm &&
2348 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2349 dst->flags |= DST_XFRM_TUNNEL;
2350 return dst;
2351
2352 nopol:
2353 if (!(flags & XFRM_LOOKUP_ICMP)) {
2354 dst = dst_orig;
2355 goto ok;
2356 }
2357 err = -ENOENT;
2358 error:
2359 dst_release(dst);
2360 dropdst:
2361 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2362 dst_release(dst_orig);
2363 xfrm_pols_put(pols, drop_pols);
2364 return ERR_PTR(err);
2365 }
2366 EXPORT_SYMBOL(xfrm_lookup);
2367
2368 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2369 * Otherwise we may send out blackholed packets.
2370 */
2371 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2372 const struct flowi *fl,
2373 const struct sock *sk, int flags)
2374 {
2375 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2376 flags | XFRM_LOOKUP_QUEUE |
2377 XFRM_LOOKUP_KEEP_DST_REF);
2378
2379 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2380 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2381
2382 return dst;
2383 }
2384 EXPORT_SYMBOL(xfrm_lookup_route);
2385
2386 static inline int
2387 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2388 {
2389 struct xfrm_state *x;
2390
2391 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2392 return 0;
2393 x = skb->sp->xvec[idx];
2394 if (!x->type->reject)
2395 return 0;
2396 return x->type->reject(x, skb, fl);
2397 }
2398
2399 /* When skb is transformed back to its "native" form, we have to
2400 * check policy restrictions. At the moment we make this in maximally
2401 * stupid way. Shame on me. :-) Of course, connected sockets must
2402 * have policy cached at them.
2403 */
2404
2405 static inline int
2406 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2407 unsigned short family)
2408 {
2409 if (xfrm_state_kern(x))
2410 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2411 return x->id.proto == tmpl->id.proto &&
2412 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2413 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2414 x->props.mode == tmpl->mode &&
2415 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2416 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2417 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2418 xfrm_state_addr_cmp(tmpl, x, family));
2419 }
2420
2421 /*
2422 * 0 or more than 0 is returned when validation is succeeded (either bypass
2423 * because of optional transport mode, or next index of the mathced secpath
2424 * state with the template.
2425 * -1 is returned when no matching template is found.
2426 * Otherwise "-2 - errored_index" is returned.
2427 */
2428 static inline int
2429 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2430 unsigned short family)
2431 {
2432 int idx = start;
2433
2434 if (tmpl->optional) {
2435 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2436 return start;
2437 } else
2438 start = -1;
2439 for (; idx < sp->len; idx++) {
2440 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2441 return ++idx;
2442 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2443 if (start == -1)
2444 start = -2-idx;
2445 break;
2446 }
2447 }
2448 return start;
2449 }
2450
2451 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2452 unsigned int family, int reverse)
2453 {
2454 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2455 int err;
2456
2457 if (unlikely(afinfo == NULL))
2458 return -EAFNOSUPPORT;
2459
2460 afinfo->decode_session(skb, fl, reverse);
2461 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2462 rcu_read_unlock();
2463 return err;
2464 }
2465 EXPORT_SYMBOL(__xfrm_decode_session);
2466
2467 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2468 {
2469 for (; k < sp->len; k++) {
2470 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2471 *idxp = k;
2472 return 1;
2473 }
2474 }
2475
2476 return 0;
2477 }
2478
2479 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2480 unsigned short family)
2481 {
2482 struct net *net = dev_net(skb->dev);
2483 struct xfrm_policy *pol;
2484 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2485 int npols = 0;
2486 int xfrm_nr;
2487 int pi;
2488 int reverse;
2489 struct flowi fl;
2490 u8 fl_dir;
2491 int xerr_idx = -1;
2492
2493 reverse = dir & ~XFRM_POLICY_MASK;
2494 dir &= XFRM_POLICY_MASK;
2495 fl_dir = policy_to_flow_dir(dir);
2496
2497 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2498 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2499 return 0;
2500 }
2501
2502 nf_nat_decode_session(skb, &fl, family);
2503
2504 /* First, check used SA against their selectors. */
2505 if (skb->sp) {
2506 int i;
2507
2508 for (i = skb->sp->len-1; i >= 0; i--) {
2509 struct xfrm_state *x = skb->sp->xvec[i];
2510 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2511 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2512 return 0;
2513 }
2514 }
2515 }
2516
2517 pol = NULL;
2518 sk = sk_to_full_sk(sk);
2519 if (sk && sk->sk_policy[dir]) {
2520 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
2521 if (IS_ERR(pol)) {
2522 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2523 return 0;
2524 }
2525 }
2526
2527 if (!pol) {
2528 struct flow_cache_object *flo;
2529
2530 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2531 xfrm_policy_lookup, NULL);
2532 if (IS_ERR_OR_NULL(flo))
2533 pol = ERR_CAST(flo);
2534 else
2535 pol = container_of(flo, struct xfrm_policy, flo);
2536 }
2537
2538 if (IS_ERR(pol)) {
2539 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2540 return 0;
2541 }
2542
2543 if (!pol) {
2544 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2545 xfrm_secpath_reject(xerr_idx, skb, &fl);
2546 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2547 return 0;
2548 }
2549 return 1;
2550 }
2551
2552 pol->curlft.use_time = get_seconds();
2553
2554 pols[0] = pol;
2555 npols++;
2556 #ifdef CONFIG_XFRM_SUB_POLICY
2557 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2558 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2559 &fl, family,
2560 XFRM_POLICY_IN);
2561 if (pols[1]) {
2562 if (IS_ERR(pols[1])) {
2563 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2564 return 0;
2565 }
2566 pols[1]->curlft.use_time = get_seconds();
2567 npols++;
2568 }
2569 }
2570 #endif
2571
2572 if (pol->action == XFRM_POLICY_ALLOW) {
2573 struct sec_path *sp;
2574 static struct sec_path dummy;
2575 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2576 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2577 struct xfrm_tmpl **tpp = tp;
2578 int ti = 0;
2579 int i, k;
2580
2581 if ((sp = skb->sp) == NULL)
2582 sp = &dummy;
2583
2584 for (pi = 0; pi < npols; pi++) {
2585 if (pols[pi] != pol &&
2586 pols[pi]->action != XFRM_POLICY_ALLOW) {
2587 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2588 goto reject;
2589 }
2590 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2591 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2592 goto reject_error;
2593 }
2594 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2595 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2596 }
2597 xfrm_nr = ti;
2598 if (npols > 1) {
2599 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2600 tpp = stp;
2601 }
2602
2603 /* For each tunnel xfrm, find the first matching tmpl.
2604 * For each tmpl before that, find corresponding xfrm.
2605 * Order is _important_. Later we will implement
2606 * some barriers, but at the moment barriers
2607 * are implied between each two transformations.
2608 */
2609 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2610 k = xfrm_policy_ok(tpp[i], sp, k, family);
2611 if (k < 0) {
2612 if (k < -1)
2613 /* "-2 - errored_index" returned */
2614 xerr_idx = -(2+k);
2615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2616 goto reject;
2617 }
2618 }
2619
2620 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2621 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2622 goto reject;
2623 }
2624
2625 xfrm_pols_put(pols, npols);
2626 return 1;
2627 }
2628 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2629
2630 reject:
2631 xfrm_secpath_reject(xerr_idx, skb, &fl);
2632 reject_error:
2633 xfrm_pols_put(pols, npols);
2634 return 0;
2635 }
2636 EXPORT_SYMBOL(__xfrm_policy_check);
2637
2638 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2639 {
2640 struct net *net = dev_net(skb->dev);
2641 struct flowi fl;
2642 struct dst_entry *dst;
2643 int res = 1;
2644
2645 if (xfrm_decode_session(skb, &fl, family) < 0) {
2646 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2647 return 0;
2648 }
2649
2650 skb_dst_force(skb);
2651
2652 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2653 if (IS_ERR(dst)) {
2654 res = 0;
2655 dst = NULL;
2656 }
2657 skb_dst_set(skb, dst);
2658 return res;
2659 }
2660 EXPORT_SYMBOL(__xfrm_route_forward);
2661
2662 /* Optimize later using cookies and generation ids. */
2663
2664 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2665 {
2666 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2667 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2668 * get validated by dst_ops->check on every use. We do this
2669 * because when a normal route referenced by an XFRM dst is
2670 * obsoleted we do not go looking around for all parent
2671 * referencing XFRM dsts so that we can invalidate them. It
2672 * is just too much work. Instead we make the checks here on
2673 * every use. For example:
2674 *
2675 * XFRM dst A --> IPv4 dst X
2676 *
2677 * X is the "xdst->route" of A (X is also the "dst->path" of A
2678 * in this example). If X is marked obsolete, "A" will not
2679 * notice. That's what we are validating here via the
2680 * stale_bundle() check.
2681 *
2682 * When a policy's bundle is pruned, we dst_free() the XFRM
2683 * dst which causes it's ->obsolete field to be set to
2684 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2685 * this, we want to force a new route lookup.
2686 */
2687 if (dst->obsolete < 0 && !stale_bundle(dst))
2688 return dst;
2689
2690 return NULL;
2691 }
2692
2693 static int stale_bundle(struct dst_entry *dst)
2694 {
2695 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2696 }
2697
2698 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2699 {
2700 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2701 dst->dev = dev_net(dev)->loopback_dev;
2702 dev_hold(dst->dev);
2703 dev_put(dev);
2704 }
2705 }
2706 EXPORT_SYMBOL(xfrm_dst_ifdown);
2707
2708 static void xfrm_link_failure(struct sk_buff *skb)
2709 {
2710 /* Impossible. Such dst must be popped before reaches point of failure. */
2711 }
2712
2713 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2714 {
2715 if (dst) {
2716 if (dst->obsolete) {
2717 dst_release(dst);
2718 dst = NULL;
2719 }
2720 }
2721 return dst;
2722 }
2723
2724 void xfrm_garbage_collect(struct net *net)
2725 {
2726 flow_cache_flush(net);
2727 }
2728 EXPORT_SYMBOL(xfrm_garbage_collect);
2729
2730 void xfrm_garbage_collect_deferred(struct net *net)
2731 {
2732 flow_cache_flush_deferred(net);
2733 }
2734 EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
2735
2736 static void xfrm_init_pmtu(struct dst_entry *dst)
2737 {
2738 do {
2739 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2740 u32 pmtu, route_mtu_cached;
2741
2742 pmtu = dst_mtu(dst->child);
2743 xdst->child_mtu_cached = pmtu;
2744
2745 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2746
2747 route_mtu_cached = dst_mtu(xdst->route);
2748 xdst->route_mtu_cached = route_mtu_cached;
2749
2750 if (pmtu > route_mtu_cached)
2751 pmtu = route_mtu_cached;
2752
2753 dst_metric_set(dst, RTAX_MTU, pmtu);
2754 } while ((dst = dst->next));
2755 }
2756
2757 /* Check that the bundle accepts the flow and its components are
2758 * still valid.
2759 */
2760
2761 static int xfrm_bundle_ok(struct xfrm_dst *first)
2762 {
2763 struct dst_entry *dst = &first->u.dst;
2764 struct xfrm_dst *last;
2765 u32 mtu;
2766
2767 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2768 (dst->dev && !netif_running(dst->dev)))
2769 return 0;
2770
2771 if (dst->flags & DST_XFRM_QUEUE)
2772 return 1;
2773
2774 last = NULL;
2775
2776 do {
2777 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2778
2779 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2780 return 0;
2781 if (xdst->xfrm_genid != dst->xfrm->genid)
2782 return 0;
2783 if (xdst->num_pols > 0 &&
2784 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2785 return 0;
2786
2787 mtu = dst_mtu(dst->child);
2788 if (xdst->child_mtu_cached != mtu) {
2789 last = xdst;
2790 xdst->child_mtu_cached = mtu;
2791 }
2792
2793 if (!dst_check(xdst->route, xdst->route_cookie))
2794 return 0;
2795 mtu = dst_mtu(xdst->route);
2796 if (xdst->route_mtu_cached != mtu) {
2797 last = xdst;
2798 xdst->route_mtu_cached = mtu;
2799 }
2800
2801 dst = dst->child;
2802 } while (dst->xfrm);
2803
2804 if (likely(!last))
2805 return 1;
2806
2807 mtu = last->child_mtu_cached;
2808 for (;;) {
2809 dst = &last->u.dst;
2810
2811 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2812 if (mtu > last->route_mtu_cached)
2813 mtu = last->route_mtu_cached;
2814 dst_metric_set(dst, RTAX_MTU, mtu);
2815
2816 if (last == first)
2817 break;
2818
2819 last = (struct xfrm_dst *)last->u.dst.next;
2820 last->child_mtu_cached = mtu;
2821 }
2822
2823 return 1;
2824 }
2825
2826 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2827 {
2828 return dst_metric_advmss(dst->path);
2829 }
2830
2831 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2832 {
2833 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2834
2835 return mtu ? : dst_mtu(dst->path);
2836 }
2837
2838 static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2839 const void *daddr)
2840 {
2841 const struct dst_entry *path = dst->path;
2842
2843 for (; dst != path; dst = dst->child) {
2844 const struct xfrm_state *xfrm = dst->xfrm;
2845
2846 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2847 continue;
2848 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2849 daddr = xfrm->coaddr;
2850 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2851 daddr = &xfrm->id.daddr;
2852 }
2853 return daddr;
2854 }
2855
2856 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2857 struct sk_buff *skb,
2858 const void *daddr)
2859 {
2860 const struct dst_entry *path = dst->path;
2861
2862 if (!skb)
2863 daddr = xfrm_get_dst_nexthop(dst, daddr);
2864 return path->ops->neigh_lookup(path, skb, daddr);
2865 }
2866
2867 static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2868 {
2869 const struct dst_entry *path = dst->path;
2870
2871 daddr = xfrm_get_dst_nexthop(dst, daddr);
2872 path->ops->confirm_neigh(path, daddr);
2873 }
2874
2875 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
2876 {
2877 int err = 0;
2878
2879 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
2880 return -EAFNOSUPPORT;
2881
2882 spin_lock(&xfrm_policy_afinfo_lock);
2883 if (unlikely(xfrm_policy_afinfo[family] != NULL))
2884 err = -EEXIST;
2885 else {
2886 struct dst_ops *dst_ops = afinfo->dst_ops;
2887 if (likely(dst_ops->kmem_cachep == NULL))
2888 dst_ops->kmem_cachep = xfrm_dst_cache;
2889 if (likely(dst_ops->check == NULL))
2890 dst_ops->check = xfrm_dst_check;
2891 if (likely(dst_ops->default_advmss == NULL))
2892 dst_ops->default_advmss = xfrm_default_advmss;
2893 if (likely(dst_ops->mtu == NULL))
2894 dst_ops->mtu = xfrm_mtu;
2895 if (likely(dst_ops->negative_advice == NULL))
2896 dst_ops->negative_advice = xfrm_negative_advice;
2897 if (likely(dst_ops->link_failure == NULL))
2898 dst_ops->link_failure = xfrm_link_failure;
2899 if (likely(dst_ops->neigh_lookup == NULL))
2900 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2901 if (likely(!dst_ops->confirm_neigh))
2902 dst_ops->confirm_neigh = xfrm_confirm_neigh;
2903 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
2904 }
2905 spin_unlock(&xfrm_policy_afinfo_lock);
2906
2907 return err;
2908 }
2909 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2910
2911 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
2912 {
2913 struct dst_ops *dst_ops = afinfo->dst_ops;
2914 int i;
2915
2916 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2917 if (xfrm_policy_afinfo[i] != afinfo)
2918 continue;
2919 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2920 break;
2921 }
2922
2923 synchronize_rcu();
2924
2925 dst_ops->kmem_cachep = NULL;
2926 dst_ops->check = NULL;
2927 dst_ops->negative_advice = NULL;
2928 dst_ops->link_failure = NULL;
2929 }
2930 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2931
2932 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2933 {
2934 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2935
2936 switch (event) {
2937 case NETDEV_DOWN:
2938 xfrm_garbage_collect(dev_net(dev));
2939 }
2940 return NOTIFY_DONE;
2941 }
2942
2943 static struct notifier_block xfrm_dev_notifier = {
2944 .notifier_call = xfrm_dev_event,
2945 };
2946
2947 #ifdef CONFIG_XFRM_STATISTICS
2948 static int __net_init xfrm_statistics_init(struct net *net)
2949 {
2950 int rv;
2951 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2952 if (!net->mib.xfrm_statistics)
2953 return -ENOMEM;
2954 rv = xfrm_proc_init(net);
2955 if (rv < 0)
2956 free_percpu(net->mib.xfrm_statistics);
2957 return rv;
2958 }
2959
2960 static void xfrm_statistics_fini(struct net *net)
2961 {
2962 xfrm_proc_fini(net);
2963 free_percpu(net->mib.xfrm_statistics);
2964 }
2965 #else
2966 static int __net_init xfrm_statistics_init(struct net *net)
2967 {
2968 return 0;
2969 }
2970
2971 static void xfrm_statistics_fini(struct net *net)
2972 {
2973 }
2974 #endif
2975
2976 static int __net_init xfrm_policy_init(struct net *net)
2977 {
2978 unsigned int hmask, sz;
2979 int dir;
2980
2981 if (net_eq(net, &init_net))
2982 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2983 sizeof(struct xfrm_dst),
2984 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2985 NULL);
2986
2987 hmask = 8 - 1;
2988 sz = (hmask+1) * sizeof(struct hlist_head);
2989
2990 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2991 if (!net->xfrm.policy_byidx)
2992 goto out_byidx;
2993 net->xfrm.policy_idx_hmask = hmask;
2994
2995 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2996 struct xfrm_policy_hash *htab;
2997
2998 net->xfrm.policy_count[dir] = 0;
2999 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
3000 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
3001
3002 htab = &net->xfrm.policy_bydst[dir];
3003 htab->table = xfrm_hash_alloc(sz);
3004 if (!htab->table)
3005 goto out_bydst;
3006 htab->hmask = hmask;
3007 htab->dbits4 = 32;
3008 htab->sbits4 = 32;
3009 htab->dbits6 = 128;
3010 htab->sbits6 = 128;
3011 }
3012 net->xfrm.policy_hthresh.lbits4 = 32;
3013 net->xfrm.policy_hthresh.rbits4 = 32;
3014 net->xfrm.policy_hthresh.lbits6 = 128;
3015 net->xfrm.policy_hthresh.rbits6 = 128;
3016
3017 seqlock_init(&net->xfrm.policy_hthresh.lock);
3018
3019 INIT_LIST_HEAD(&net->xfrm.policy_all);
3020 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
3021 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
3022 if (net_eq(net, &init_net))
3023 register_netdevice_notifier(&xfrm_dev_notifier);
3024 return 0;
3025
3026 out_bydst:
3027 for (dir--; dir >= 0; dir--) {
3028 struct xfrm_policy_hash *htab;
3029
3030 htab = &net->xfrm.policy_bydst[dir];
3031 xfrm_hash_free(htab->table, sz);
3032 }
3033 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3034 out_byidx:
3035 return -ENOMEM;
3036 }
3037
3038 static void xfrm_policy_fini(struct net *net)
3039 {
3040 unsigned int sz;
3041 int dir;
3042
3043 flush_work(&net->xfrm.policy_hash_work);
3044 #ifdef CONFIG_XFRM_SUB_POLICY
3045 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
3046 #endif
3047 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
3048
3049 WARN_ON(!list_empty(&net->xfrm.policy_all));
3050
3051 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
3052 struct xfrm_policy_hash *htab;
3053
3054 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
3055
3056 htab = &net->xfrm.policy_bydst[dir];
3057 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
3058 WARN_ON(!hlist_empty(htab->table));
3059 xfrm_hash_free(htab->table, sz);
3060 }
3061
3062 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
3063 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3064 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3065 }
3066
3067 static int __net_init xfrm_net_init(struct net *net)
3068 {
3069 int rv;
3070
3071 /* Initialize the per-net locks here */
3072 spin_lock_init(&net->xfrm.xfrm_state_lock);
3073 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3074 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3075
3076 rv = xfrm_statistics_init(net);
3077 if (rv < 0)
3078 goto out_statistics;
3079 rv = xfrm_state_init(net);
3080 if (rv < 0)
3081 goto out_state;
3082 rv = xfrm_policy_init(net);
3083 if (rv < 0)
3084 goto out_policy;
3085 rv = xfrm_sysctl_init(net);
3086 if (rv < 0)
3087 goto out_sysctl;
3088 rv = flow_cache_init(net);
3089 if (rv < 0)
3090 goto out;
3091
3092 return 0;
3093
3094 out:
3095 xfrm_sysctl_fini(net);
3096 out_sysctl:
3097 xfrm_policy_fini(net);
3098 out_policy:
3099 xfrm_state_fini(net);
3100 out_state:
3101 xfrm_statistics_fini(net);
3102 out_statistics:
3103 return rv;
3104 }
3105
3106 static void __net_exit xfrm_net_exit(struct net *net)
3107 {
3108 flow_cache_fini(net);
3109 xfrm_sysctl_fini(net);
3110 xfrm_policy_fini(net);
3111 xfrm_state_fini(net);
3112 xfrm_statistics_fini(net);
3113 }
3114
3115 static struct pernet_operations __net_initdata xfrm_net_ops = {
3116 .init = xfrm_net_init,
3117 .exit = xfrm_net_exit,
3118 };
3119
3120 void __init xfrm_init(void)
3121 {
3122 flow_cache_hp_init();
3123 register_pernet_subsys(&xfrm_net_ops);
3124 seqcount_init(&xfrm_policy_hash_generation);
3125 xfrm_input_init();
3126 }
3127
3128 #ifdef CONFIG_AUDITSYSCALL
3129 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3130 struct audit_buffer *audit_buf)
3131 {
3132 struct xfrm_sec_ctx *ctx = xp->security;
3133 struct xfrm_selector *sel = &xp->selector;
3134
3135 if (ctx)
3136 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3137 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3138
3139 switch (sel->family) {
3140 case AF_INET:
3141 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
3142 if (sel->prefixlen_s != 32)
3143 audit_log_format(audit_buf, " src_prefixlen=%d",
3144 sel->prefixlen_s);
3145 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
3146 if (sel->prefixlen_d != 32)
3147 audit_log_format(audit_buf, " dst_prefixlen=%d",
3148 sel->prefixlen_d);
3149 break;
3150 case AF_INET6:
3151 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3152 if (sel->prefixlen_s != 128)
3153 audit_log_format(audit_buf, " src_prefixlen=%d",
3154 sel->prefixlen_s);
3155 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3156 if (sel->prefixlen_d != 128)
3157 audit_log_format(audit_buf, " dst_prefixlen=%d",
3158 sel->prefixlen_d);
3159 break;
3160 }
3161 }
3162
3163 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3164 {
3165 struct audit_buffer *audit_buf;
3166
3167 audit_buf = xfrm_audit_start("SPD-add");
3168 if (audit_buf == NULL)
3169 return;
3170 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3171 audit_log_format(audit_buf, " res=%u", result);
3172 xfrm_audit_common_policyinfo(xp, audit_buf);
3173 audit_log_end(audit_buf);
3174 }
3175 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3176
3177 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3178 bool task_valid)
3179 {
3180 struct audit_buffer *audit_buf;
3181
3182 audit_buf = xfrm_audit_start("SPD-delete");
3183 if (audit_buf == NULL)
3184 return;
3185 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3186 audit_log_format(audit_buf, " res=%u", result);
3187 xfrm_audit_common_policyinfo(xp, audit_buf);
3188 audit_log_end(audit_buf);
3189 }
3190 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3191 #endif
3192
3193 #ifdef CONFIG_XFRM_MIGRATE
3194 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3195 const struct xfrm_selector *sel_tgt)
3196 {
3197 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3198 if (sel_tgt->family == sel_cmp->family &&
3199 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3200 sel_cmp->family) &&
3201 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3202 sel_cmp->family) &&
3203 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3204 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3205 return true;
3206 }
3207 } else {
3208 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3209 return true;
3210 }
3211 }
3212 return false;
3213 }
3214
3215 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3216 u8 dir, u8 type, struct net *net)
3217 {
3218 struct xfrm_policy *pol, *ret = NULL;
3219 struct hlist_head *chain;
3220 u32 priority = ~0U;
3221
3222 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
3223 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3224 hlist_for_each_entry(pol, chain, bydst) {
3225 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3226 pol->type == type) {
3227 ret = pol;
3228 priority = ret->priority;
3229 break;
3230 }
3231 }
3232 chain = &net->xfrm.policy_inexact[dir];
3233 hlist_for_each_entry(pol, chain, bydst) {
3234 if ((pol->priority >= priority) && ret)
3235 break;
3236
3237 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3238 pol->type == type) {
3239 ret = pol;
3240 break;
3241 }
3242 }
3243
3244 xfrm_pol_hold(ret);
3245
3246 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
3247
3248 return ret;
3249 }
3250
3251 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3252 {
3253 int match = 0;
3254
3255 if (t->mode == m->mode && t->id.proto == m->proto &&
3256 (m->reqid == 0 || t->reqid == m->reqid)) {
3257 switch (t->mode) {
3258 case XFRM_MODE_TUNNEL:
3259 case XFRM_MODE_BEET:
3260 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3261 m->old_family) &&
3262 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3263 m->old_family)) {
3264 match = 1;
3265 }
3266 break;
3267 case XFRM_MODE_TRANSPORT:
3268 /* in case of transport mode, template does not store
3269 any IP addresses, hence we just compare mode and
3270 protocol */
3271 match = 1;
3272 break;
3273 default:
3274 break;
3275 }
3276 }
3277 return match;
3278 }
3279
3280 /* update endpoint address(es) of template(s) */
3281 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3282 struct xfrm_migrate *m, int num_migrate)
3283 {
3284 struct xfrm_migrate *mp;
3285 int i, j, n = 0;
3286
3287 write_lock_bh(&pol->lock);
3288 if (unlikely(pol->walk.dead)) {
3289 /* target policy has been deleted */
3290 write_unlock_bh(&pol->lock);
3291 return -ENOENT;
3292 }
3293
3294 for (i = 0; i < pol->xfrm_nr; i++) {
3295 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3296 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3297 continue;
3298 n++;
3299 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3300 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3301 continue;
3302 /* update endpoints */
3303 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3304 sizeof(pol->xfrm_vec[i].id.daddr));
3305 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3306 sizeof(pol->xfrm_vec[i].saddr));
3307 pol->xfrm_vec[i].encap_family = mp->new_family;
3308 /* flush bundles */
3309 atomic_inc(&pol->genid);
3310 }
3311 }
3312
3313 write_unlock_bh(&pol->lock);
3314
3315 if (!n)
3316 return -ENODATA;
3317
3318 return 0;
3319 }
3320
3321 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3322 {
3323 int i, j;
3324
3325 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3326 return -EINVAL;
3327
3328 for (i = 0; i < num_migrate; i++) {
3329 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3330 m[i].old_family) &&
3331 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3332 m[i].old_family))
3333 return -EINVAL;
3334 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3335 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3336 return -EINVAL;
3337
3338 /* check if there is any duplicated entry */
3339 for (j = i + 1; j < num_migrate; j++) {
3340 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3341 sizeof(m[i].old_daddr)) &&
3342 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3343 sizeof(m[i].old_saddr)) &&
3344 m[i].proto == m[j].proto &&
3345 m[i].mode == m[j].mode &&
3346 m[i].reqid == m[j].reqid &&
3347 m[i].old_family == m[j].old_family)
3348 return -EINVAL;
3349 }
3350 }
3351
3352 return 0;
3353 }
3354
3355 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3356 struct xfrm_migrate *m, int num_migrate,
3357 struct xfrm_kmaddress *k, struct net *net)
3358 {
3359 int i, err, nx_cur = 0, nx_new = 0;
3360 struct xfrm_policy *pol = NULL;
3361 struct xfrm_state *x, *xc;
3362 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3363 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3364 struct xfrm_migrate *mp;
3365
3366 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3367 goto out;
3368
3369 /* Stage 1 - find policy */
3370 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3371 err = -ENOENT;
3372 goto out;
3373 }
3374
3375 /* Stage 2 - find and update state(s) */
3376 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3377 if ((x = xfrm_migrate_state_find(mp, net))) {
3378 x_cur[nx_cur] = x;
3379 nx_cur++;
3380 if ((xc = xfrm_state_migrate(x, mp))) {
3381 x_new[nx_new] = xc;
3382 nx_new++;
3383 } else {
3384 err = -ENODATA;
3385 goto restore_state;
3386 }
3387 }
3388 }
3389
3390 /* Stage 3 - update policy */
3391 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3392 goto restore_state;
3393
3394 /* Stage 4 - delete old state(s) */
3395 if (nx_cur) {
3396 xfrm_states_put(x_cur, nx_cur);
3397 xfrm_states_delete(x_cur, nx_cur);
3398 }
3399
3400 /* Stage 5 - announce */
3401 km_migrate(sel, dir, type, m, num_migrate, k);
3402
3403 xfrm_pol_put(pol);
3404
3405 return 0;
3406 out:
3407 return err;
3408
3409 restore_state:
3410 if (pol)
3411 xfrm_pol_put(pol);
3412 if (nx_cur)
3413 xfrm_states_put(x_cur, nx_cur);
3414 if (nx_new)
3415 xfrm_states_delete(x_new, nx_new);
3416
3417 return err;
3418 }
3419 EXPORT_SYMBOL(xfrm_migrate);
3420 #endif
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