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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 refcount_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 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
120 const xfrm_address_t *saddr,
121 const xfrm_address_t *daddr,
122 int family)
123 {
124 const struct xfrm_policy_afinfo *afinfo;
125 struct dst_entry *dst;
126
127 afinfo = xfrm_policy_get_afinfo(family);
128 if (unlikely(afinfo == NULL))
129 return ERR_PTR(-EAFNOSUPPORT);
130
131 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
132
133 rcu_read_unlock();
134
135 return dst;
136 }
137 EXPORT_SYMBOL(__xfrm_dst_lookup);
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 refcount_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 /* Mark DST_OBSOLETE_DEAD to fail the next xfrm_dst_check() */
1590 dst->obsolete = DST_OBSOLETE_DEAD;
1591 dst_release_immediate(dst);
1592 }
1593
1594 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1595 .get = xfrm_bundle_flo_get,
1596 .check = xfrm_bundle_flo_check,
1597 .delete = xfrm_bundle_flo_delete,
1598 };
1599
1600 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1601 {
1602 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1603 struct dst_ops *dst_ops;
1604 struct xfrm_dst *xdst;
1605
1606 if (!afinfo)
1607 return ERR_PTR(-EINVAL);
1608
1609 switch (family) {
1610 case AF_INET:
1611 dst_ops = &net->xfrm.xfrm4_dst_ops;
1612 break;
1613 #if IS_ENABLED(CONFIG_IPV6)
1614 case AF_INET6:
1615 dst_ops = &net->xfrm.xfrm6_dst_ops;
1616 break;
1617 #endif
1618 default:
1619 BUG();
1620 }
1621 xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
1622
1623 if (likely(xdst)) {
1624 struct dst_entry *dst = &xdst->u.dst;
1625
1626 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1627 xdst->flo.ops = &xfrm_bundle_fc_ops;
1628 } else
1629 xdst = ERR_PTR(-ENOBUFS);
1630
1631 rcu_read_unlock();
1632
1633 return xdst;
1634 }
1635
1636 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1637 int nfheader_len)
1638 {
1639 const struct xfrm_policy_afinfo *afinfo =
1640 xfrm_policy_get_afinfo(dst->ops->family);
1641 int err;
1642
1643 if (!afinfo)
1644 return -EINVAL;
1645
1646 err = afinfo->init_path(path, dst, nfheader_len);
1647
1648 rcu_read_unlock();
1649
1650 return err;
1651 }
1652
1653 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1654 const struct flowi *fl)
1655 {
1656 const struct xfrm_policy_afinfo *afinfo =
1657 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1658 int err;
1659
1660 if (!afinfo)
1661 return -EINVAL;
1662
1663 err = afinfo->fill_dst(xdst, dev, fl);
1664
1665 rcu_read_unlock();
1666
1667 return err;
1668 }
1669
1670
1671 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1672 * all the metrics... Shortly, bundle a bundle.
1673 */
1674
1675 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1676 struct xfrm_state **xfrm, int nx,
1677 const struct flowi *fl,
1678 struct dst_entry *dst)
1679 {
1680 struct net *net = xp_net(policy);
1681 unsigned long now = jiffies;
1682 struct net_device *dev;
1683 struct xfrm_mode *inner_mode;
1684 struct dst_entry *dst_prev = NULL;
1685 struct dst_entry *dst0 = NULL;
1686 int i = 0;
1687 int err;
1688 int header_len = 0;
1689 int nfheader_len = 0;
1690 int trailer_len = 0;
1691 int tos;
1692 int family = policy->selector.family;
1693 xfrm_address_t saddr, daddr;
1694
1695 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1696
1697 tos = xfrm_get_tos(fl, family);
1698
1699 dst_hold(dst);
1700
1701 for (; i < nx; i++) {
1702 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1703 struct dst_entry *dst1 = &xdst->u.dst;
1704
1705 err = PTR_ERR(xdst);
1706 if (IS_ERR(xdst)) {
1707 dst_release(dst);
1708 goto put_states;
1709 }
1710
1711 if (xfrm[i]->sel.family == AF_UNSPEC) {
1712 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1713 xfrm_af2proto(family));
1714 if (!inner_mode) {
1715 err = -EAFNOSUPPORT;
1716 dst_release(dst);
1717 goto put_states;
1718 }
1719 } else
1720 inner_mode = xfrm[i]->inner_mode;
1721
1722 if (!dst_prev)
1723 dst0 = dst1;
1724 else
1725 /* Ref count is taken during xfrm_alloc_dst()
1726 * No need to do dst_clone() on dst1
1727 */
1728 dst_prev->child = dst1;
1729
1730 xdst->route = dst;
1731 dst_copy_metrics(dst1, dst);
1732
1733 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1734 family = xfrm[i]->props.family;
1735 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1736 &saddr, &daddr, family);
1737 err = PTR_ERR(dst);
1738 if (IS_ERR(dst))
1739 goto put_states;
1740 } else
1741 dst_hold(dst);
1742
1743 dst1->xfrm = xfrm[i];
1744 xdst->xfrm_genid = xfrm[i]->genid;
1745
1746 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1747 dst1->flags |= DST_HOST;
1748 dst1->lastuse = now;
1749
1750 dst1->input = dst_discard;
1751 dst1->output = inner_mode->afinfo->output;
1752
1753 dst1->next = dst_prev;
1754 dst_prev = dst1;
1755
1756 header_len += xfrm[i]->props.header_len;
1757 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1758 nfheader_len += xfrm[i]->props.header_len;
1759 trailer_len += xfrm[i]->props.trailer_len;
1760 }
1761
1762 dst_prev->child = dst;
1763 dst0->path = dst;
1764
1765 err = -ENODEV;
1766 dev = dst->dev;
1767 if (!dev)
1768 goto free_dst;
1769
1770 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1771 xfrm_init_pmtu(dst_prev);
1772
1773 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1774 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1775
1776 err = xfrm_fill_dst(xdst, dev, fl);
1777 if (err)
1778 goto free_dst;
1779
1780 dst_prev->header_len = header_len;
1781 dst_prev->trailer_len = trailer_len;
1782 header_len -= xdst->u.dst.xfrm->props.header_len;
1783 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1784 }
1785
1786 out:
1787 return dst0;
1788
1789 put_states:
1790 for (; i < nx; i++)
1791 xfrm_state_put(xfrm[i]);
1792 free_dst:
1793 if (dst0)
1794 dst_release_immediate(dst0);
1795 dst0 = ERR_PTR(err);
1796 goto out;
1797 }
1798
1799 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1800 struct xfrm_policy **pols,
1801 int *num_pols, int *num_xfrms)
1802 {
1803 int i;
1804
1805 if (*num_pols == 0 || !pols[0]) {
1806 *num_pols = 0;
1807 *num_xfrms = 0;
1808 return 0;
1809 }
1810 if (IS_ERR(pols[0]))
1811 return PTR_ERR(pols[0]);
1812
1813 *num_xfrms = pols[0]->xfrm_nr;
1814
1815 #ifdef CONFIG_XFRM_SUB_POLICY
1816 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1817 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1818 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1819 XFRM_POLICY_TYPE_MAIN,
1820 fl, family,
1821 XFRM_POLICY_OUT);
1822 if (pols[1]) {
1823 if (IS_ERR(pols[1])) {
1824 xfrm_pols_put(pols, *num_pols);
1825 return PTR_ERR(pols[1]);
1826 }
1827 (*num_pols)++;
1828 (*num_xfrms) += pols[1]->xfrm_nr;
1829 }
1830 }
1831 #endif
1832 for (i = 0; i < *num_pols; i++) {
1833 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1834 *num_xfrms = -1;
1835 break;
1836 }
1837 }
1838
1839 return 0;
1840
1841 }
1842
1843 static struct xfrm_dst *
1844 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1845 const struct flowi *fl, u16 family,
1846 struct dst_entry *dst_orig)
1847 {
1848 struct net *net = xp_net(pols[0]);
1849 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1850 struct dst_entry *dst;
1851 struct xfrm_dst *xdst;
1852 int err;
1853
1854 /* Try to instantiate a bundle */
1855 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1856 if (err <= 0) {
1857 if (err != 0 && err != -EAGAIN)
1858 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1859 return ERR_PTR(err);
1860 }
1861
1862 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1863 if (IS_ERR(dst)) {
1864 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1865 return ERR_CAST(dst);
1866 }
1867
1868 xdst = (struct xfrm_dst *)dst;
1869 xdst->num_xfrms = err;
1870 xdst->num_pols = num_pols;
1871 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1872 xdst->policy_genid = atomic_read(&pols[0]->genid);
1873
1874 return xdst;
1875 }
1876
1877 static void xfrm_policy_queue_process(unsigned long arg)
1878 {
1879 struct sk_buff *skb;
1880 struct sock *sk;
1881 struct dst_entry *dst;
1882 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1883 struct net *net = xp_net(pol);
1884 struct xfrm_policy_queue *pq = &pol->polq;
1885 struct flowi fl;
1886 struct sk_buff_head list;
1887
1888 spin_lock(&pq->hold_queue.lock);
1889 skb = skb_peek(&pq->hold_queue);
1890 if (!skb) {
1891 spin_unlock(&pq->hold_queue.lock);
1892 goto out;
1893 }
1894 dst = skb_dst(skb);
1895 sk = skb->sk;
1896 xfrm_decode_session(skb, &fl, dst->ops->family);
1897 spin_unlock(&pq->hold_queue.lock);
1898
1899 dst_hold(dst->path);
1900 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
1901 if (IS_ERR(dst))
1902 goto purge_queue;
1903
1904 if (dst->flags & DST_XFRM_QUEUE) {
1905 dst_release(dst);
1906
1907 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1908 goto purge_queue;
1909
1910 pq->timeout = pq->timeout << 1;
1911 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1912 xfrm_pol_hold(pol);
1913 goto out;
1914 }
1915
1916 dst_release(dst);
1917
1918 __skb_queue_head_init(&list);
1919
1920 spin_lock(&pq->hold_queue.lock);
1921 pq->timeout = 0;
1922 skb_queue_splice_init(&pq->hold_queue, &list);
1923 spin_unlock(&pq->hold_queue.lock);
1924
1925 while (!skb_queue_empty(&list)) {
1926 skb = __skb_dequeue(&list);
1927
1928 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1929 dst_hold(skb_dst(skb)->path);
1930 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
1931 if (IS_ERR(dst)) {
1932 kfree_skb(skb);
1933 continue;
1934 }
1935
1936 nf_reset(skb);
1937 skb_dst_drop(skb);
1938 skb_dst_set(skb, dst);
1939
1940 dst_output(net, skb->sk, skb);
1941 }
1942
1943 out:
1944 xfrm_pol_put(pol);
1945 return;
1946
1947 purge_queue:
1948 pq->timeout = 0;
1949 skb_queue_purge(&pq->hold_queue);
1950 xfrm_pol_put(pol);
1951 }
1952
1953 static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
1954 {
1955 unsigned long sched_next;
1956 struct dst_entry *dst = skb_dst(skb);
1957 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1958 struct xfrm_policy *pol = xdst->pols[0];
1959 struct xfrm_policy_queue *pq = &pol->polq;
1960
1961 if (unlikely(skb_fclone_busy(sk, skb))) {
1962 kfree_skb(skb);
1963 return 0;
1964 }
1965
1966 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1967 kfree_skb(skb);
1968 return -EAGAIN;
1969 }
1970
1971 skb_dst_force(skb);
1972
1973 spin_lock_bh(&pq->hold_queue.lock);
1974
1975 if (!pq->timeout)
1976 pq->timeout = XFRM_QUEUE_TMO_MIN;
1977
1978 sched_next = jiffies + pq->timeout;
1979
1980 if (del_timer(&pq->hold_timer)) {
1981 if (time_before(pq->hold_timer.expires, sched_next))
1982 sched_next = pq->hold_timer.expires;
1983 xfrm_pol_put(pol);
1984 }
1985
1986 __skb_queue_tail(&pq->hold_queue, skb);
1987 if (!mod_timer(&pq->hold_timer, sched_next))
1988 xfrm_pol_hold(pol);
1989
1990 spin_unlock_bh(&pq->hold_queue.lock);
1991
1992 return 0;
1993 }
1994
1995 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
1996 struct xfrm_flo *xflo,
1997 const struct flowi *fl,
1998 int num_xfrms,
1999 u16 family)
2000 {
2001 int err;
2002 struct net_device *dev;
2003 struct dst_entry *dst;
2004 struct dst_entry *dst1;
2005 struct xfrm_dst *xdst;
2006
2007 xdst = xfrm_alloc_dst(net, family);
2008 if (IS_ERR(xdst))
2009 return xdst;
2010
2011 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2012 net->xfrm.sysctl_larval_drop ||
2013 num_xfrms <= 0)
2014 return xdst;
2015
2016 dst = xflo->dst_orig;
2017 dst1 = &xdst->u.dst;
2018 dst_hold(dst);
2019 xdst->route = dst;
2020
2021 dst_copy_metrics(dst1, dst);
2022
2023 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2024 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2025 dst1->lastuse = jiffies;
2026
2027 dst1->input = dst_discard;
2028 dst1->output = xdst_queue_output;
2029
2030 dst_hold(dst);
2031 dst1->child = dst;
2032 dst1->path = dst;
2033
2034 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2035
2036 err = -ENODEV;
2037 dev = dst->dev;
2038 if (!dev)
2039 goto free_dst;
2040
2041 err = xfrm_fill_dst(xdst, dev, fl);
2042 if (err)
2043 goto free_dst;
2044
2045 out:
2046 return xdst;
2047
2048 free_dst:
2049 dst_release(dst1);
2050 xdst = ERR_PTR(err);
2051 goto out;
2052 }
2053
2054 static struct flow_cache_object *
2055 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
2056 struct flow_cache_object *oldflo, void *ctx)
2057 {
2058 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
2059 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2060 struct xfrm_dst *xdst, *new_xdst;
2061 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2062
2063 /* Check if the policies from old bundle are usable */
2064 xdst = NULL;
2065 if (oldflo) {
2066 xdst = container_of(oldflo, struct xfrm_dst, flo);
2067 num_pols = xdst->num_pols;
2068 num_xfrms = xdst->num_xfrms;
2069 pol_dead = 0;
2070 for (i = 0; i < num_pols; i++) {
2071 pols[i] = xdst->pols[i];
2072 pol_dead |= pols[i]->walk.dead;
2073 }
2074 if (pol_dead) {
2075 /* Mark DST_OBSOLETE_DEAD to fail the next
2076 * xfrm_dst_check()
2077 */
2078 xdst->u.dst.obsolete = DST_OBSOLETE_DEAD;
2079 dst_release_immediate(&xdst->u.dst);
2080 xdst = NULL;
2081 num_pols = 0;
2082 num_xfrms = 0;
2083 oldflo = NULL;
2084 }
2085 }
2086
2087 /* Resolve policies to use if we couldn't get them from
2088 * previous cache entry */
2089 if (xdst == NULL) {
2090 num_pols = 1;
2091 pols[0] = __xfrm_policy_lookup(net, fl, family,
2092 flow_to_policy_dir(dir));
2093 err = xfrm_expand_policies(fl, family, pols,
2094 &num_pols, &num_xfrms);
2095 if (err < 0)
2096 goto inc_error;
2097 if (num_pols == 0)
2098 return NULL;
2099 if (num_xfrms <= 0)
2100 goto make_dummy_bundle;
2101 }
2102
2103 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2104 xflo->dst_orig);
2105 if (IS_ERR(new_xdst)) {
2106 err = PTR_ERR(new_xdst);
2107 if (err != -EAGAIN)
2108 goto error;
2109 if (oldflo == NULL)
2110 goto make_dummy_bundle;
2111 dst_hold(&xdst->u.dst);
2112 return oldflo;
2113 } else if (new_xdst == NULL) {
2114 num_xfrms = 0;
2115 if (oldflo == NULL)
2116 goto make_dummy_bundle;
2117 xdst->num_xfrms = 0;
2118 dst_hold(&xdst->u.dst);
2119 return oldflo;
2120 }
2121
2122 /* Kill the previous bundle */
2123 if (xdst) {
2124 /* The policies were stolen for newly generated bundle */
2125 xdst->num_pols = 0;
2126 /* Mark DST_OBSOLETE_DEAD to fail the next xfrm_dst_check() */
2127 xdst->u.dst.obsolete = DST_OBSOLETE_DEAD;
2128 dst_release_immediate(&xdst->u.dst);
2129 }
2130
2131 /* We do need to return one reference for original caller */
2132 dst_hold(&new_xdst->u.dst);
2133 return &new_xdst->flo;
2134
2135 make_dummy_bundle:
2136 /* We found policies, but there's no bundles to instantiate:
2137 * either because the policy blocks, has no transformations or
2138 * we could not build template (no xfrm_states).*/
2139 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2140 if (IS_ERR(xdst)) {
2141 xfrm_pols_put(pols, num_pols);
2142 return ERR_CAST(xdst);
2143 }
2144 xdst->num_pols = num_pols;
2145 xdst->num_xfrms = num_xfrms;
2146 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2147
2148 dst_hold(&xdst->u.dst);
2149 return &xdst->flo;
2150
2151 inc_error:
2152 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2153 error:
2154 if (xdst != NULL) {
2155 /* Mark DST_OBSOLETE_DEAD to fail the next xfrm_dst_check() */
2156 xdst->u.dst.obsolete = DST_OBSOLETE_DEAD;
2157 dst_release_immediate(&xdst->u.dst);
2158 } else
2159 xfrm_pols_put(pols, num_pols);
2160 return ERR_PTR(err);
2161 }
2162
2163 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2164 struct dst_entry *dst_orig)
2165 {
2166 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2167 struct dst_entry *ret;
2168
2169 if (!afinfo) {
2170 dst_release(dst_orig);
2171 return ERR_PTR(-EINVAL);
2172 } else {
2173 ret = afinfo->blackhole_route(net, dst_orig);
2174 }
2175 rcu_read_unlock();
2176
2177 return ret;
2178 }
2179
2180 /* Main function: finds/creates a bundle for given flow.
2181 *
2182 * At the moment we eat a raw IP route. Mostly to speed up lookups
2183 * on interfaces with disabled IPsec.
2184 */
2185 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2186 const struct flowi *fl,
2187 const struct sock *sk, int flags)
2188 {
2189 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2190 struct flow_cache_object *flo;
2191 struct xfrm_dst *xdst;
2192 struct dst_entry *dst, *route;
2193 u16 family = dst_orig->ops->family;
2194 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2195 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2196
2197 dst = NULL;
2198 xdst = NULL;
2199 route = NULL;
2200
2201 sk = sk_const_to_full_sk(sk);
2202 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2203 num_pols = 1;
2204 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
2205 err = xfrm_expand_policies(fl, family, pols,
2206 &num_pols, &num_xfrms);
2207 if (err < 0)
2208 goto dropdst;
2209
2210 if (num_pols) {
2211 if (num_xfrms <= 0) {
2212 drop_pols = num_pols;
2213 goto no_transform;
2214 }
2215
2216 xdst = xfrm_resolve_and_create_bundle(
2217 pols, num_pols, fl,
2218 family, dst_orig);
2219 if (IS_ERR(xdst)) {
2220 xfrm_pols_put(pols, num_pols);
2221 err = PTR_ERR(xdst);
2222 goto dropdst;
2223 } else if (xdst == NULL) {
2224 num_xfrms = 0;
2225 drop_pols = num_pols;
2226 goto no_transform;
2227 }
2228
2229 route = xdst->route;
2230 }
2231 }
2232
2233 if (xdst == NULL) {
2234 struct xfrm_flo xflo;
2235
2236 xflo.dst_orig = dst_orig;
2237 xflo.flags = flags;
2238
2239 /* To accelerate a bit... */
2240 if ((dst_orig->flags & DST_NOXFRM) ||
2241 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2242 goto nopol;
2243
2244 flo = flow_cache_lookup(net, fl, family, dir,
2245 xfrm_bundle_lookup, &xflo);
2246 if (flo == NULL)
2247 goto nopol;
2248 if (IS_ERR(flo)) {
2249 err = PTR_ERR(flo);
2250 goto dropdst;
2251 }
2252 xdst = container_of(flo, struct xfrm_dst, flo);
2253
2254 num_pols = xdst->num_pols;
2255 num_xfrms = xdst->num_xfrms;
2256 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2257 route = xdst->route;
2258 }
2259
2260 dst = &xdst->u.dst;
2261 if (route == NULL && num_xfrms > 0) {
2262 /* The only case when xfrm_bundle_lookup() returns a
2263 * bundle with null route, is when the template could
2264 * not be resolved. It means policies are there, but
2265 * bundle could not be created, since we don't yet
2266 * have the xfrm_state's. We need to wait for KM to
2267 * negotiate new SA's or bail out with error.*/
2268 if (net->xfrm.sysctl_larval_drop) {
2269 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2270 err = -EREMOTE;
2271 goto error;
2272 }
2273
2274 err = -EAGAIN;
2275
2276 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2277 goto error;
2278 }
2279
2280 no_transform:
2281 if (num_pols == 0)
2282 goto nopol;
2283
2284 if ((flags & XFRM_LOOKUP_ICMP) &&
2285 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2286 err = -ENOENT;
2287 goto error;
2288 }
2289
2290 for (i = 0; i < num_pols; i++)
2291 pols[i]->curlft.use_time = get_seconds();
2292
2293 if (num_xfrms < 0) {
2294 /* Prohibit the flow */
2295 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2296 err = -EPERM;
2297 goto error;
2298 } else if (num_xfrms > 0) {
2299 /* Flow transformed */
2300 dst_release(dst_orig);
2301 } else {
2302 /* Flow passes untransformed */
2303 dst_release(dst);
2304 dst = dst_orig;
2305 }
2306 ok:
2307 xfrm_pols_put(pols, drop_pols);
2308 if (dst && dst->xfrm &&
2309 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2310 dst->flags |= DST_XFRM_TUNNEL;
2311 return dst;
2312
2313 nopol:
2314 if (!(flags & XFRM_LOOKUP_ICMP)) {
2315 dst = dst_orig;
2316 goto ok;
2317 }
2318 err = -ENOENT;
2319 error:
2320 dst_release(dst);
2321 dropdst:
2322 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2323 dst_release(dst_orig);
2324 xfrm_pols_put(pols, drop_pols);
2325 return ERR_PTR(err);
2326 }
2327 EXPORT_SYMBOL(xfrm_lookup);
2328
2329 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2330 * Otherwise we may send out blackholed packets.
2331 */
2332 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2333 const struct flowi *fl,
2334 const struct sock *sk, int flags)
2335 {
2336 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2337 flags | XFRM_LOOKUP_QUEUE |
2338 XFRM_LOOKUP_KEEP_DST_REF);
2339
2340 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2341 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2342
2343 return dst;
2344 }
2345 EXPORT_SYMBOL(xfrm_lookup_route);
2346
2347 static inline int
2348 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2349 {
2350 struct xfrm_state *x;
2351
2352 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2353 return 0;
2354 x = skb->sp->xvec[idx];
2355 if (!x->type->reject)
2356 return 0;
2357 return x->type->reject(x, skb, fl);
2358 }
2359
2360 /* When skb is transformed back to its "native" form, we have to
2361 * check policy restrictions. At the moment we make this in maximally
2362 * stupid way. Shame on me. :-) Of course, connected sockets must
2363 * have policy cached at them.
2364 */
2365
2366 static inline int
2367 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2368 unsigned short family)
2369 {
2370 if (xfrm_state_kern(x))
2371 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2372 return x->id.proto == tmpl->id.proto &&
2373 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2374 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2375 x->props.mode == tmpl->mode &&
2376 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2377 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2378 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2379 xfrm_state_addr_cmp(tmpl, x, family));
2380 }
2381
2382 /*
2383 * 0 or more than 0 is returned when validation is succeeded (either bypass
2384 * because of optional transport mode, or next index of the mathced secpath
2385 * state with the template.
2386 * -1 is returned when no matching template is found.
2387 * Otherwise "-2 - errored_index" is returned.
2388 */
2389 static inline int
2390 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2391 unsigned short family)
2392 {
2393 int idx = start;
2394
2395 if (tmpl->optional) {
2396 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2397 return start;
2398 } else
2399 start = -1;
2400 for (; idx < sp->len; idx++) {
2401 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2402 return ++idx;
2403 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2404 if (start == -1)
2405 start = -2-idx;
2406 break;
2407 }
2408 }
2409 return start;
2410 }
2411
2412 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2413 unsigned int family, int reverse)
2414 {
2415 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2416 int err;
2417
2418 if (unlikely(afinfo == NULL))
2419 return -EAFNOSUPPORT;
2420
2421 afinfo->decode_session(skb, fl, reverse);
2422 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2423 rcu_read_unlock();
2424 return err;
2425 }
2426 EXPORT_SYMBOL(__xfrm_decode_session);
2427
2428 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2429 {
2430 for (; k < sp->len; k++) {
2431 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2432 *idxp = k;
2433 return 1;
2434 }
2435 }
2436
2437 return 0;
2438 }
2439
2440 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2441 unsigned short family)
2442 {
2443 struct net *net = dev_net(skb->dev);
2444 struct xfrm_policy *pol;
2445 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2446 int npols = 0;
2447 int xfrm_nr;
2448 int pi;
2449 int reverse;
2450 struct flowi fl;
2451 u8 fl_dir;
2452 int xerr_idx = -1;
2453
2454 reverse = dir & ~XFRM_POLICY_MASK;
2455 dir &= XFRM_POLICY_MASK;
2456 fl_dir = policy_to_flow_dir(dir);
2457
2458 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2459 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2460 return 0;
2461 }
2462
2463 nf_nat_decode_session(skb, &fl, family);
2464
2465 /* First, check used SA against their selectors. */
2466 if (skb->sp) {
2467 int i;
2468
2469 for (i = skb->sp->len-1; i >= 0; i--) {
2470 struct xfrm_state *x = skb->sp->xvec[i];
2471 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2472 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2473 return 0;
2474 }
2475 }
2476 }
2477
2478 pol = NULL;
2479 sk = sk_to_full_sk(sk);
2480 if (sk && sk->sk_policy[dir]) {
2481 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
2482 if (IS_ERR(pol)) {
2483 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2484 return 0;
2485 }
2486 }
2487
2488 if (!pol) {
2489 struct flow_cache_object *flo;
2490
2491 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2492 xfrm_policy_lookup, NULL);
2493 if (IS_ERR_OR_NULL(flo))
2494 pol = ERR_CAST(flo);
2495 else
2496 pol = container_of(flo, struct xfrm_policy, flo);
2497 }
2498
2499 if (IS_ERR(pol)) {
2500 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2501 return 0;
2502 }
2503
2504 if (!pol) {
2505 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2506 xfrm_secpath_reject(xerr_idx, skb, &fl);
2507 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2508 return 0;
2509 }
2510 return 1;
2511 }
2512
2513 pol->curlft.use_time = get_seconds();
2514
2515 pols[0] = pol;
2516 npols++;
2517 #ifdef CONFIG_XFRM_SUB_POLICY
2518 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2519 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2520 &fl, family,
2521 XFRM_POLICY_IN);
2522 if (pols[1]) {
2523 if (IS_ERR(pols[1])) {
2524 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2525 return 0;
2526 }
2527 pols[1]->curlft.use_time = get_seconds();
2528 npols++;
2529 }
2530 }
2531 #endif
2532
2533 if (pol->action == XFRM_POLICY_ALLOW) {
2534 struct sec_path *sp;
2535 static struct sec_path dummy;
2536 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2537 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2538 struct xfrm_tmpl **tpp = tp;
2539 int ti = 0;
2540 int i, k;
2541
2542 if ((sp = skb->sp) == NULL)
2543 sp = &dummy;
2544
2545 for (pi = 0; pi < npols; pi++) {
2546 if (pols[pi] != pol &&
2547 pols[pi]->action != XFRM_POLICY_ALLOW) {
2548 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2549 goto reject;
2550 }
2551 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2552 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2553 goto reject_error;
2554 }
2555 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2556 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2557 }
2558 xfrm_nr = ti;
2559 if (npols > 1) {
2560 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2561 tpp = stp;
2562 }
2563
2564 /* For each tunnel xfrm, find the first matching tmpl.
2565 * For each tmpl before that, find corresponding xfrm.
2566 * Order is _important_. Later we will implement
2567 * some barriers, but at the moment barriers
2568 * are implied between each two transformations.
2569 */
2570 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2571 k = xfrm_policy_ok(tpp[i], sp, k, family);
2572 if (k < 0) {
2573 if (k < -1)
2574 /* "-2 - errored_index" returned */
2575 xerr_idx = -(2+k);
2576 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2577 goto reject;
2578 }
2579 }
2580
2581 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2582 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2583 goto reject;
2584 }
2585
2586 xfrm_pols_put(pols, npols);
2587 return 1;
2588 }
2589 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2590
2591 reject:
2592 xfrm_secpath_reject(xerr_idx, skb, &fl);
2593 reject_error:
2594 xfrm_pols_put(pols, npols);
2595 return 0;
2596 }
2597 EXPORT_SYMBOL(__xfrm_policy_check);
2598
2599 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2600 {
2601 struct net *net = dev_net(skb->dev);
2602 struct flowi fl;
2603 struct dst_entry *dst;
2604 int res = 1;
2605
2606 if (xfrm_decode_session(skb, &fl, family) < 0) {
2607 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2608 return 0;
2609 }
2610
2611 skb_dst_force(skb);
2612
2613 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2614 if (IS_ERR(dst)) {
2615 res = 0;
2616 dst = NULL;
2617 }
2618 skb_dst_set(skb, dst);
2619 return res;
2620 }
2621 EXPORT_SYMBOL(__xfrm_route_forward);
2622
2623 /* Optimize later using cookies and generation ids. */
2624
2625 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2626 {
2627 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2628 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2629 * get validated by dst_ops->check on every use. We do this
2630 * because when a normal route referenced by an XFRM dst is
2631 * obsoleted we do not go looking around for all parent
2632 * referencing XFRM dsts so that we can invalidate them. It
2633 * is just too much work. Instead we make the checks here on
2634 * every use. For example:
2635 *
2636 * XFRM dst A --> IPv4 dst X
2637 *
2638 * X is the "xdst->route" of A (X is also the "dst->path" of A
2639 * in this example). If X is marked obsolete, "A" will not
2640 * notice. That's what we are validating here via the
2641 * stale_bundle() check.
2642 *
2643 * When an xdst is removed from flow cache, DST_OBSOLETE_DEAD will
2644 * be marked on it.
2645 * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will
2646 * be marked on it.
2647 * Both will force stable_bundle() to fail on any xdst bundle with
2648 * this dst linked in it.
2649 */
2650 if (dst->obsolete < 0 && !stale_bundle(dst))
2651 return dst;
2652
2653 return NULL;
2654 }
2655
2656 static int stale_bundle(struct dst_entry *dst)
2657 {
2658 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2659 }
2660
2661 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2662 {
2663 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2664 dst->dev = dev_net(dev)->loopback_dev;
2665 dev_hold(dst->dev);
2666 dev_put(dev);
2667 }
2668 }
2669 EXPORT_SYMBOL(xfrm_dst_ifdown);
2670
2671 static void xfrm_link_failure(struct sk_buff *skb)
2672 {
2673 /* Impossible. Such dst must be popped before reaches point of failure. */
2674 }
2675
2676 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2677 {
2678 if (dst) {
2679 if (dst->obsolete) {
2680 dst_release(dst);
2681 dst = NULL;
2682 }
2683 }
2684 return dst;
2685 }
2686
2687 void xfrm_garbage_collect(struct net *net)
2688 {
2689 flow_cache_flush(net);
2690 }
2691 EXPORT_SYMBOL(xfrm_garbage_collect);
2692
2693 void xfrm_garbage_collect_deferred(struct net *net)
2694 {
2695 flow_cache_flush_deferred(net);
2696 }
2697 EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
2698
2699 static void xfrm_init_pmtu(struct dst_entry *dst)
2700 {
2701 do {
2702 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2703 u32 pmtu, route_mtu_cached;
2704
2705 pmtu = dst_mtu(dst->child);
2706 xdst->child_mtu_cached = pmtu;
2707
2708 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2709
2710 route_mtu_cached = dst_mtu(xdst->route);
2711 xdst->route_mtu_cached = route_mtu_cached;
2712
2713 if (pmtu > route_mtu_cached)
2714 pmtu = route_mtu_cached;
2715
2716 dst_metric_set(dst, RTAX_MTU, pmtu);
2717 } while ((dst = dst->next));
2718 }
2719
2720 /* Check that the bundle accepts the flow and its components are
2721 * still valid.
2722 */
2723
2724 static int xfrm_bundle_ok(struct xfrm_dst *first)
2725 {
2726 struct dst_entry *dst = &first->u.dst;
2727 struct xfrm_dst *last;
2728 u32 mtu;
2729
2730 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2731 (dst->dev && !netif_running(dst->dev)))
2732 return 0;
2733
2734 if (dst->flags & DST_XFRM_QUEUE)
2735 return 1;
2736
2737 last = NULL;
2738
2739 do {
2740 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2741
2742 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2743 return 0;
2744 if (xdst->xfrm_genid != dst->xfrm->genid)
2745 return 0;
2746 if (xdst->num_pols > 0 &&
2747 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2748 return 0;
2749
2750 mtu = dst_mtu(dst->child);
2751 if (xdst->child_mtu_cached != mtu) {
2752 last = xdst;
2753 xdst->child_mtu_cached = mtu;
2754 }
2755
2756 if (!dst_check(xdst->route, xdst->route_cookie))
2757 return 0;
2758 mtu = dst_mtu(xdst->route);
2759 if (xdst->route_mtu_cached != mtu) {
2760 last = xdst;
2761 xdst->route_mtu_cached = mtu;
2762 }
2763
2764 dst = dst->child;
2765 } while (dst->xfrm);
2766
2767 if (likely(!last))
2768 return 1;
2769
2770 mtu = last->child_mtu_cached;
2771 for (;;) {
2772 dst = &last->u.dst;
2773
2774 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2775 if (mtu > last->route_mtu_cached)
2776 mtu = last->route_mtu_cached;
2777 dst_metric_set(dst, RTAX_MTU, mtu);
2778
2779 if (last == first)
2780 break;
2781
2782 last = (struct xfrm_dst *)last->u.dst.next;
2783 last->child_mtu_cached = mtu;
2784 }
2785
2786 return 1;
2787 }
2788
2789 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2790 {
2791 return dst_metric_advmss(dst->path);
2792 }
2793
2794 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2795 {
2796 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2797
2798 return mtu ? : dst_mtu(dst->path);
2799 }
2800
2801 static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2802 const void *daddr)
2803 {
2804 const struct dst_entry *path = dst->path;
2805
2806 for (; dst != path; dst = dst->child) {
2807 const struct xfrm_state *xfrm = dst->xfrm;
2808
2809 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2810 continue;
2811 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2812 daddr = xfrm->coaddr;
2813 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2814 daddr = &xfrm->id.daddr;
2815 }
2816 return daddr;
2817 }
2818
2819 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2820 struct sk_buff *skb,
2821 const void *daddr)
2822 {
2823 const struct dst_entry *path = dst->path;
2824
2825 if (!skb)
2826 daddr = xfrm_get_dst_nexthop(dst, daddr);
2827 return path->ops->neigh_lookup(path, skb, daddr);
2828 }
2829
2830 static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2831 {
2832 const struct dst_entry *path = dst->path;
2833
2834 daddr = xfrm_get_dst_nexthop(dst, daddr);
2835 path->ops->confirm_neigh(path, daddr);
2836 }
2837
2838 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
2839 {
2840 int err = 0;
2841
2842 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
2843 return -EAFNOSUPPORT;
2844
2845 spin_lock(&xfrm_policy_afinfo_lock);
2846 if (unlikely(xfrm_policy_afinfo[family] != NULL))
2847 err = -EEXIST;
2848 else {
2849 struct dst_ops *dst_ops = afinfo->dst_ops;
2850 if (likely(dst_ops->kmem_cachep == NULL))
2851 dst_ops->kmem_cachep = xfrm_dst_cache;
2852 if (likely(dst_ops->check == NULL))
2853 dst_ops->check = xfrm_dst_check;
2854 if (likely(dst_ops->default_advmss == NULL))
2855 dst_ops->default_advmss = xfrm_default_advmss;
2856 if (likely(dst_ops->mtu == NULL))
2857 dst_ops->mtu = xfrm_mtu;
2858 if (likely(dst_ops->negative_advice == NULL))
2859 dst_ops->negative_advice = xfrm_negative_advice;
2860 if (likely(dst_ops->link_failure == NULL))
2861 dst_ops->link_failure = xfrm_link_failure;
2862 if (likely(dst_ops->neigh_lookup == NULL))
2863 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2864 if (likely(!dst_ops->confirm_neigh))
2865 dst_ops->confirm_neigh = xfrm_confirm_neigh;
2866 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
2867 }
2868 spin_unlock(&xfrm_policy_afinfo_lock);
2869
2870 return err;
2871 }
2872 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2873
2874 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
2875 {
2876 struct dst_ops *dst_ops = afinfo->dst_ops;
2877 int i;
2878
2879 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2880 if (xfrm_policy_afinfo[i] != afinfo)
2881 continue;
2882 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2883 break;
2884 }
2885
2886 synchronize_rcu();
2887
2888 dst_ops->kmem_cachep = NULL;
2889 dst_ops->check = NULL;
2890 dst_ops->negative_advice = NULL;
2891 dst_ops->link_failure = NULL;
2892 }
2893 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2894
2895 #ifdef CONFIG_XFRM_STATISTICS
2896 static int __net_init xfrm_statistics_init(struct net *net)
2897 {
2898 int rv;
2899 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2900 if (!net->mib.xfrm_statistics)
2901 return -ENOMEM;
2902 rv = xfrm_proc_init(net);
2903 if (rv < 0)
2904 free_percpu(net->mib.xfrm_statistics);
2905 return rv;
2906 }
2907
2908 static void xfrm_statistics_fini(struct net *net)
2909 {
2910 xfrm_proc_fini(net);
2911 free_percpu(net->mib.xfrm_statistics);
2912 }
2913 #else
2914 static int __net_init xfrm_statistics_init(struct net *net)
2915 {
2916 return 0;
2917 }
2918
2919 static void xfrm_statistics_fini(struct net *net)
2920 {
2921 }
2922 #endif
2923
2924 static int __net_init xfrm_policy_init(struct net *net)
2925 {
2926 unsigned int hmask, sz;
2927 int dir;
2928
2929 if (net_eq(net, &init_net))
2930 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2931 sizeof(struct xfrm_dst),
2932 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2933 NULL);
2934
2935 hmask = 8 - 1;
2936 sz = (hmask+1) * sizeof(struct hlist_head);
2937
2938 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2939 if (!net->xfrm.policy_byidx)
2940 goto out_byidx;
2941 net->xfrm.policy_idx_hmask = hmask;
2942
2943 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2944 struct xfrm_policy_hash *htab;
2945
2946 net->xfrm.policy_count[dir] = 0;
2947 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
2948 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2949
2950 htab = &net->xfrm.policy_bydst[dir];
2951 htab->table = xfrm_hash_alloc(sz);
2952 if (!htab->table)
2953 goto out_bydst;
2954 htab->hmask = hmask;
2955 htab->dbits4 = 32;
2956 htab->sbits4 = 32;
2957 htab->dbits6 = 128;
2958 htab->sbits6 = 128;
2959 }
2960 net->xfrm.policy_hthresh.lbits4 = 32;
2961 net->xfrm.policy_hthresh.rbits4 = 32;
2962 net->xfrm.policy_hthresh.lbits6 = 128;
2963 net->xfrm.policy_hthresh.rbits6 = 128;
2964
2965 seqlock_init(&net->xfrm.policy_hthresh.lock);
2966
2967 INIT_LIST_HEAD(&net->xfrm.policy_all);
2968 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2969 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
2970 if (net_eq(net, &init_net))
2971 xfrm_dev_init();
2972 return 0;
2973
2974 out_bydst:
2975 for (dir--; dir >= 0; dir--) {
2976 struct xfrm_policy_hash *htab;
2977
2978 htab = &net->xfrm.policy_bydst[dir];
2979 xfrm_hash_free(htab->table, sz);
2980 }
2981 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2982 out_byidx:
2983 return -ENOMEM;
2984 }
2985
2986 static void xfrm_policy_fini(struct net *net)
2987 {
2988 unsigned int sz;
2989 int dir;
2990
2991 flush_work(&net->xfrm.policy_hash_work);
2992 #ifdef CONFIG_XFRM_SUB_POLICY
2993 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
2994 #endif
2995 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
2996
2997 WARN_ON(!list_empty(&net->xfrm.policy_all));
2998
2999 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
3000 struct xfrm_policy_hash *htab;
3001
3002 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
3003
3004 htab = &net->xfrm.policy_bydst[dir];
3005 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
3006 WARN_ON(!hlist_empty(htab->table));
3007 xfrm_hash_free(htab->table, sz);
3008 }
3009
3010 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
3011 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3012 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3013 }
3014
3015 static int __net_init xfrm_net_init(struct net *net)
3016 {
3017 int rv;
3018
3019 /* Initialize the per-net locks here */
3020 spin_lock_init(&net->xfrm.xfrm_state_lock);
3021 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3022 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3023
3024 rv = xfrm_statistics_init(net);
3025 if (rv < 0)
3026 goto out_statistics;
3027 rv = xfrm_state_init(net);
3028 if (rv < 0)
3029 goto out_state;
3030 rv = xfrm_policy_init(net);
3031 if (rv < 0)
3032 goto out_policy;
3033 rv = xfrm_sysctl_init(net);
3034 if (rv < 0)
3035 goto out_sysctl;
3036 rv = flow_cache_init(net);
3037 if (rv < 0)
3038 goto out;
3039
3040 return 0;
3041
3042 out:
3043 xfrm_sysctl_fini(net);
3044 out_sysctl:
3045 xfrm_policy_fini(net);
3046 out_policy:
3047 xfrm_state_fini(net);
3048 out_state:
3049 xfrm_statistics_fini(net);
3050 out_statistics:
3051 return rv;
3052 }
3053
3054 static void __net_exit xfrm_net_exit(struct net *net)
3055 {
3056 flow_cache_fini(net);
3057 xfrm_sysctl_fini(net);
3058 xfrm_policy_fini(net);
3059 xfrm_state_fini(net);
3060 xfrm_statistics_fini(net);
3061 }
3062
3063 static struct pernet_operations __net_initdata xfrm_net_ops = {
3064 .init = xfrm_net_init,
3065 .exit = xfrm_net_exit,
3066 };
3067
3068 void __init xfrm_init(void)
3069 {
3070 flow_cache_hp_init();
3071 register_pernet_subsys(&xfrm_net_ops);
3072 seqcount_init(&xfrm_policy_hash_generation);
3073 xfrm_input_init();
3074 }
3075
3076 #ifdef CONFIG_AUDITSYSCALL
3077 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3078 struct audit_buffer *audit_buf)
3079 {
3080 struct xfrm_sec_ctx *ctx = xp->security;
3081 struct xfrm_selector *sel = &xp->selector;
3082
3083 if (ctx)
3084 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3085 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3086
3087 switch (sel->family) {
3088 case AF_INET:
3089 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
3090 if (sel->prefixlen_s != 32)
3091 audit_log_format(audit_buf, " src_prefixlen=%d",
3092 sel->prefixlen_s);
3093 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
3094 if (sel->prefixlen_d != 32)
3095 audit_log_format(audit_buf, " dst_prefixlen=%d",
3096 sel->prefixlen_d);
3097 break;
3098 case AF_INET6:
3099 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3100 if (sel->prefixlen_s != 128)
3101 audit_log_format(audit_buf, " src_prefixlen=%d",
3102 sel->prefixlen_s);
3103 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3104 if (sel->prefixlen_d != 128)
3105 audit_log_format(audit_buf, " dst_prefixlen=%d",
3106 sel->prefixlen_d);
3107 break;
3108 }
3109 }
3110
3111 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3112 {
3113 struct audit_buffer *audit_buf;
3114
3115 audit_buf = xfrm_audit_start("SPD-add");
3116 if (audit_buf == NULL)
3117 return;
3118 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3119 audit_log_format(audit_buf, " res=%u", result);
3120 xfrm_audit_common_policyinfo(xp, audit_buf);
3121 audit_log_end(audit_buf);
3122 }
3123 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3124
3125 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3126 bool task_valid)
3127 {
3128 struct audit_buffer *audit_buf;
3129
3130 audit_buf = xfrm_audit_start("SPD-delete");
3131 if (audit_buf == NULL)
3132 return;
3133 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3134 audit_log_format(audit_buf, " res=%u", result);
3135 xfrm_audit_common_policyinfo(xp, audit_buf);
3136 audit_log_end(audit_buf);
3137 }
3138 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3139 #endif
3140
3141 #ifdef CONFIG_XFRM_MIGRATE
3142 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3143 const struct xfrm_selector *sel_tgt)
3144 {
3145 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3146 if (sel_tgt->family == sel_cmp->family &&
3147 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3148 sel_cmp->family) &&
3149 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3150 sel_cmp->family) &&
3151 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3152 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3153 return true;
3154 }
3155 } else {
3156 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3157 return true;
3158 }
3159 }
3160 return false;
3161 }
3162
3163 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3164 u8 dir, u8 type, struct net *net)
3165 {
3166 struct xfrm_policy *pol, *ret = NULL;
3167 struct hlist_head *chain;
3168 u32 priority = ~0U;
3169
3170 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
3171 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3172 hlist_for_each_entry(pol, chain, bydst) {
3173 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3174 pol->type == type) {
3175 ret = pol;
3176 priority = ret->priority;
3177 break;
3178 }
3179 }
3180 chain = &net->xfrm.policy_inexact[dir];
3181 hlist_for_each_entry(pol, chain, bydst) {
3182 if ((pol->priority >= priority) && ret)
3183 break;
3184
3185 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3186 pol->type == type) {
3187 ret = pol;
3188 break;
3189 }
3190 }
3191
3192 xfrm_pol_hold(ret);
3193
3194 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
3195
3196 return ret;
3197 }
3198
3199 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3200 {
3201 int match = 0;
3202
3203 if (t->mode == m->mode && t->id.proto == m->proto &&
3204 (m->reqid == 0 || t->reqid == m->reqid)) {
3205 switch (t->mode) {
3206 case XFRM_MODE_TUNNEL:
3207 case XFRM_MODE_BEET:
3208 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3209 m->old_family) &&
3210 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3211 m->old_family)) {
3212 match = 1;
3213 }
3214 break;
3215 case XFRM_MODE_TRANSPORT:
3216 /* in case of transport mode, template does not store
3217 any IP addresses, hence we just compare mode and
3218 protocol */
3219 match = 1;
3220 break;
3221 default:
3222 break;
3223 }
3224 }
3225 return match;
3226 }
3227
3228 /* update endpoint address(es) of template(s) */
3229 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3230 struct xfrm_migrate *m, int num_migrate)
3231 {
3232 struct xfrm_migrate *mp;
3233 int i, j, n = 0;
3234
3235 write_lock_bh(&pol->lock);
3236 if (unlikely(pol->walk.dead)) {
3237 /* target policy has been deleted */
3238 write_unlock_bh(&pol->lock);
3239 return -ENOENT;
3240 }
3241
3242 for (i = 0; i < pol->xfrm_nr; i++) {
3243 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3244 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3245 continue;
3246 n++;
3247 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3248 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3249 continue;
3250 /* update endpoints */
3251 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3252 sizeof(pol->xfrm_vec[i].id.daddr));
3253 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3254 sizeof(pol->xfrm_vec[i].saddr));
3255 pol->xfrm_vec[i].encap_family = mp->new_family;
3256 /* flush bundles */
3257 atomic_inc(&pol->genid);
3258 }
3259 }
3260
3261 write_unlock_bh(&pol->lock);
3262
3263 if (!n)
3264 return -ENODATA;
3265
3266 return 0;
3267 }
3268
3269 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3270 {
3271 int i, j;
3272
3273 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3274 return -EINVAL;
3275
3276 for (i = 0; i < num_migrate; i++) {
3277 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3278 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3279 return -EINVAL;
3280
3281 /* check if there is any duplicated entry */
3282 for (j = i + 1; j < num_migrate; j++) {
3283 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3284 sizeof(m[i].old_daddr)) &&
3285 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3286 sizeof(m[i].old_saddr)) &&
3287 m[i].proto == m[j].proto &&
3288 m[i].mode == m[j].mode &&
3289 m[i].reqid == m[j].reqid &&
3290 m[i].old_family == m[j].old_family)
3291 return -EINVAL;
3292 }
3293 }
3294
3295 return 0;
3296 }
3297
3298 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3299 struct xfrm_migrate *m, int num_migrate,
3300 struct xfrm_kmaddress *k, struct net *net,
3301 struct xfrm_encap_tmpl *encap)
3302 {
3303 int i, err, nx_cur = 0, nx_new = 0;
3304 struct xfrm_policy *pol = NULL;
3305 struct xfrm_state *x, *xc;
3306 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3307 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3308 struct xfrm_migrate *mp;
3309
3310 /* Stage 0 - sanity checks */
3311 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3312 goto out;
3313
3314 if (dir >= XFRM_POLICY_MAX) {
3315 err = -EINVAL;
3316 goto out;
3317 }
3318
3319 /* Stage 1 - find policy */
3320 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3321 err = -ENOENT;
3322 goto out;
3323 }
3324
3325 /* Stage 2 - find and update state(s) */
3326 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3327 if ((x = xfrm_migrate_state_find(mp, net))) {
3328 x_cur[nx_cur] = x;
3329 nx_cur++;
3330 xc = xfrm_state_migrate(x, mp, encap);
3331 if (xc) {
3332 x_new[nx_new] = xc;
3333 nx_new++;
3334 } else {
3335 err = -ENODATA;
3336 goto restore_state;
3337 }
3338 }
3339 }
3340
3341 /* Stage 3 - update policy */
3342 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3343 goto restore_state;
3344
3345 /* Stage 4 - delete old state(s) */
3346 if (nx_cur) {
3347 xfrm_states_put(x_cur, nx_cur);
3348 xfrm_states_delete(x_cur, nx_cur);
3349 }
3350
3351 /* Stage 5 - announce */
3352 km_migrate(sel, dir, type, m, num_migrate, k, encap);
3353
3354 xfrm_pol_put(pol);
3355
3356 return 0;
3357 out:
3358 return err;
3359
3360 restore_state:
3361 if (pol)
3362 xfrm_pol_put(pol);
3363 if (nx_cur)
3364 xfrm_states_put(x_cur, nx_cur);
3365 if (nx_new)
3366 xfrm_states_delete(x_new, nx_new);
3367
3368 return err;
3369 }
3370 EXPORT_SYMBOL(xfrm_migrate);
3371 #endif
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