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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / xfrm / xfrm_policy.c
1 /*
2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
13 *
14 */
15
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/kmod.h>
19 #include <linux/list.h>
20 #include <linux/spinlock.h>
21 #include <linux/workqueue.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/cache.h>
27 #include <linux/audit.h>
28 #include <net/dst.h>
29 #include <net/flow.h>
30 #include <net/xfrm.h>
31 #include <net/ip.h>
32 #ifdef CONFIG_XFRM_STATISTICS
33 #include <net/snmp.h>
34 #endif
35
36 #include "xfrm_hash.h"
37
38 #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39 #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40 #define XFRM_MAX_QUEUE_LEN 100
41
42 struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45 };
46
47 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
48 static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
49 __read_mostly;
50
51 static struct kmem_cache *xfrm_dst_cache __read_mostly;
52
53 static void xfrm_init_pmtu(struct dst_entry *dst);
54 static int stale_bundle(struct dst_entry *dst);
55 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
56 static void xfrm_policy_queue_process(unsigned long arg);
57
58 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
59 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
60 int dir);
61
62 static inline bool
63 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
64 {
65 const struct flowi4 *fl4 = &fl->u.ip4;
66
67 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
68 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
69 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
70 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
71 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
72 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
73 }
74
75 static inline bool
76 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77 {
78 const struct flowi6 *fl6 = &fl->u.ip6;
79
80 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
81 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
82 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
83 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
84 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
85 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
86 }
87
88 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
89 unsigned short family)
90 {
91 switch (family) {
92 case AF_INET:
93 return __xfrm4_selector_match(sel, fl);
94 case AF_INET6:
95 return __xfrm6_selector_match(sel, fl);
96 }
97 return false;
98 }
99
100 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
101 {
102 struct xfrm_policy_afinfo *afinfo;
103
104 if (unlikely(family >= NPROTO))
105 return NULL;
106 rcu_read_lock();
107 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
108 if (unlikely(!afinfo))
109 rcu_read_unlock();
110 return afinfo;
111 }
112
113 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
114 {
115 rcu_read_unlock();
116 }
117
118 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
119 const xfrm_address_t *saddr,
120 const xfrm_address_t *daddr,
121 int family)
122 {
123 struct xfrm_policy_afinfo *afinfo;
124 struct dst_entry *dst;
125
126 afinfo = xfrm_policy_get_afinfo(family);
127 if (unlikely(afinfo == NULL))
128 return ERR_PTR(-EAFNOSUPPORT);
129
130 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
131
132 xfrm_policy_put_afinfo(afinfo);
133
134 return dst;
135 }
136
137 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
138 xfrm_address_t *prev_saddr,
139 xfrm_address_t *prev_daddr,
140 int family)
141 {
142 struct net *net = xs_net(x);
143 xfrm_address_t *saddr = &x->props.saddr;
144 xfrm_address_t *daddr = &x->id.daddr;
145 struct dst_entry *dst;
146
147 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
148 saddr = x->coaddr;
149 daddr = prev_daddr;
150 }
151 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
152 saddr = prev_saddr;
153 daddr = x->coaddr;
154 }
155
156 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
157
158 if (!IS_ERR(dst)) {
159 if (prev_saddr != saddr)
160 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
161 if (prev_daddr != daddr)
162 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
163 }
164
165 return dst;
166 }
167
168 static inline unsigned long make_jiffies(long secs)
169 {
170 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
171 return MAX_SCHEDULE_TIMEOUT-1;
172 else
173 return secs*HZ;
174 }
175
176 static void xfrm_policy_timer(unsigned long data)
177 {
178 struct xfrm_policy *xp = (struct xfrm_policy *)data;
179 unsigned long now = get_seconds();
180 long next = LONG_MAX;
181 int warn = 0;
182 int dir;
183
184 read_lock(&xp->lock);
185
186 if (unlikely(xp->walk.dead))
187 goto out;
188
189 dir = xfrm_policy_id2dir(xp->index);
190
191 if (xp->lft.hard_add_expires_seconds) {
192 long tmo = xp->lft.hard_add_expires_seconds +
193 xp->curlft.add_time - now;
194 if (tmo <= 0)
195 goto expired;
196 if (tmo < next)
197 next = tmo;
198 }
199 if (xp->lft.hard_use_expires_seconds) {
200 long tmo = xp->lft.hard_use_expires_seconds +
201 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
202 if (tmo <= 0)
203 goto expired;
204 if (tmo < next)
205 next = tmo;
206 }
207 if (xp->lft.soft_add_expires_seconds) {
208 long tmo = xp->lft.soft_add_expires_seconds +
209 xp->curlft.add_time - now;
210 if (tmo <= 0) {
211 warn = 1;
212 tmo = XFRM_KM_TIMEOUT;
213 }
214 if (tmo < next)
215 next = tmo;
216 }
217 if (xp->lft.soft_use_expires_seconds) {
218 long tmo = xp->lft.soft_use_expires_seconds +
219 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
220 if (tmo <= 0) {
221 warn = 1;
222 tmo = XFRM_KM_TIMEOUT;
223 }
224 if (tmo < next)
225 next = tmo;
226 }
227
228 if (warn)
229 km_policy_expired(xp, dir, 0, 0);
230 if (next != LONG_MAX &&
231 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
232 xfrm_pol_hold(xp);
233
234 out:
235 read_unlock(&xp->lock);
236 xfrm_pol_put(xp);
237 return;
238
239 expired:
240 read_unlock(&xp->lock);
241 if (!xfrm_policy_delete(xp, dir))
242 km_policy_expired(xp, dir, 1, 0);
243 xfrm_pol_put(xp);
244 }
245
246 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
247 {
248 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
249
250 if (unlikely(pol->walk.dead))
251 flo = NULL;
252 else
253 xfrm_pol_hold(pol);
254
255 return flo;
256 }
257
258 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
259 {
260 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
261
262 return !pol->walk.dead;
263 }
264
265 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
266 {
267 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
268 }
269
270 static const struct flow_cache_ops xfrm_policy_fc_ops = {
271 .get = xfrm_policy_flo_get,
272 .check = xfrm_policy_flo_check,
273 .delete = xfrm_policy_flo_delete,
274 };
275
276 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
277 * SPD calls.
278 */
279
280 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
281 {
282 struct xfrm_policy *policy;
283
284 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
285
286 if (policy) {
287 write_pnet(&policy->xp_net, net);
288 INIT_LIST_HEAD(&policy->walk.all);
289 INIT_HLIST_NODE(&policy->bydst);
290 INIT_HLIST_NODE(&policy->byidx);
291 rwlock_init(&policy->lock);
292 atomic_set(&policy->refcnt, 1);
293 skb_queue_head_init(&policy->polq.hold_queue);
294 setup_timer(&policy->timer, xfrm_policy_timer,
295 (unsigned long)policy);
296 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
297 (unsigned long)policy);
298 policy->flo.ops = &xfrm_policy_fc_ops;
299 }
300 return policy;
301 }
302 EXPORT_SYMBOL(xfrm_policy_alloc);
303
304 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
305
306 void xfrm_policy_destroy(struct xfrm_policy *policy)
307 {
308 BUG_ON(!policy->walk.dead);
309
310 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
311 BUG();
312
313 security_xfrm_policy_free(policy->security);
314 kfree(policy);
315 }
316 EXPORT_SYMBOL(xfrm_policy_destroy);
317
318 static void xfrm_queue_purge(struct sk_buff_head *list)
319 {
320 struct sk_buff *skb;
321
322 while ((skb = skb_dequeue(list)) != NULL)
323 kfree_skb(skb);
324 }
325
326 /* Rule must be locked. Release descentant resources, announce
327 * entry dead. The rule must be unlinked from lists to the moment.
328 */
329
330 static void xfrm_policy_kill(struct xfrm_policy *policy)
331 {
332 policy->walk.dead = 1;
333
334 atomic_inc(&policy->genid);
335
336 if (del_timer(&policy->polq.hold_timer))
337 xfrm_pol_put(policy);
338 xfrm_queue_purge(&policy->polq.hold_queue);
339
340 if (del_timer(&policy->timer))
341 xfrm_pol_put(policy);
342
343 xfrm_pol_put(policy);
344 }
345
346 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
347
348 static inline unsigned int idx_hash(struct net *net, u32 index)
349 {
350 return __idx_hash(index, net->xfrm.policy_idx_hmask);
351 }
352
353 /* calculate policy hash thresholds */
354 static void __get_hash_thresh(struct net *net,
355 unsigned short family, int dir,
356 u8 *dbits, u8 *sbits)
357 {
358 switch (family) {
359 case AF_INET:
360 *dbits = net->xfrm.policy_bydst[dir].dbits4;
361 *sbits = net->xfrm.policy_bydst[dir].sbits4;
362 break;
363
364 case AF_INET6:
365 *dbits = net->xfrm.policy_bydst[dir].dbits6;
366 *sbits = net->xfrm.policy_bydst[dir].sbits6;
367 break;
368
369 default:
370 *dbits = 0;
371 *sbits = 0;
372 }
373 }
374
375 static struct hlist_head *policy_hash_bysel(struct net *net,
376 const struct xfrm_selector *sel,
377 unsigned short family, int dir)
378 {
379 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
380 unsigned int hash;
381 u8 dbits;
382 u8 sbits;
383
384 __get_hash_thresh(net, family, dir, &dbits, &sbits);
385 hash = __sel_hash(sel, family, hmask, dbits, sbits);
386
387 return (hash == hmask + 1 ?
388 &net->xfrm.policy_inexact[dir] :
389 net->xfrm.policy_bydst[dir].table + hash);
390 }
391
392 static struct hlist_head *policy_hash_direct(struct net *net,
393 const xfrm_address_t *daddr,
394 const xfrm_address_t *saddr,
395 unsigned short family, int dir)
396 {
397 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
398 unsigned int hash;
399 u8 dbits;
400 u8 sbits;
401
402 __get_hash_thresh(net, family, dir, &dbits, &sbits);
403 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
404
405 return net->xfrm.policy_bydst[dir].table + hash;
406 }
407
408 static void xfrm_dst_hash_transfer(struct net *net,
409 struct hlist_head *list,
410 struct hlist_head *ndsttable,
411 unsigned int nhashmask,
412 int dir)
413 {
414 struct hlist_node *tmp, *entry0 = NULL;
415 struct xfrm_policy *pol;
416 unsigned int h0 = 0;
417 u8 dbits;
418 u8 sbits;
419
420 redo:
421 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
422 unsigned int h;
423
424 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
425 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
426 pol->family, nhashmask, dbits, sbits);
427 if (!entry0) {
428 hlist_del(&pol->bydst);
429 hlist_add_head(&pol->bydst, ndsttable+h);
430 h0 = h;
431 } else {
432 if (h != h0)
433 continue;
434 hlist_del(&pol->bydst);
435 hlist_add_behind(&pol->bydst, entry0);
436 }
437 entry0 = &pol->bydst;
438 }
439 if (!hlist_empty(list)) {
440 entry0 = NULL;
441 goto redo;
442 }
443 }
444
445 static void xfrm_idx_hash_transfer(struct hlist_head *list,
446 struct hlist_head *nidxtable,
447 unsigned int nhashmask)
448 {
449 struct hlist_node *tmp;
450 struct xfrm_policy *pol;
451
452 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
453 unsigned int h;
454
455 h = __idx_hash(pol->index, nhashmask);
456 hlist_add_head(&pol->byidx, nidxtable+h);
457 }
458 }
459
460 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
461 {
462 return ((old_hmask + 1) << 1) - 1;
463 }
464
465 static void xfrm_bydst_resize(struct net *net, int dir)
466 {
467 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
468 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
469 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
470 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
471 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
472 int i;
473
474 if (!ndst)
475 return;
476
477 write_lock_bh(&net->xfrm.xfrm_policy_lock);
478
479 for (i = hmask; i >= 0; i--)
480 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
481
482 net->xfrm.policy_bydst[dir].table = ndst;
483 net->xfrm.policy_bydst[dir].hmask = nhashmask;
484
485 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
486
487 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
488 }
489
490 static void xfrm_byidx_resize(struct net *net, int total)
491 {
492 unsigned int hmask = net->xfrm.policy_idx_hmask;
493 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
494 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
495 struct hlist_head *oidx = net->xfrm.policy_byidx;
496 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
497 int i;
498
499 if (!nidx)
500 return;
501
502 write_lock_bh(&net->xfrm.xfrm_policy_lock);
503
504 for (i = hmask; i >= 0; i--)
505 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
506
507 net->xfrm.policy_byidx = nidx;
508 net->xfrm.policy_idx_hmask = nhashmask;
509
510 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
511
512 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
513 }
514
515 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
516 {
517 unsigned int cnt = net->xfrm.policy_count[dir];
518 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
519
520 if (total)
521 *total += cnt;
522
523 if ((hmask + 1) < xfrm_policy_hashmax &&
524 cnt > hmask)
525 return 1;
526
527 return 0;
528 }
529
530 static inline int xfrm_byidx_should_resize(struct net *net, int total)
531 {
532 unsigned int hmask = net->xfrm.policy_idx_hmask;
533
534 if ((hmask + 1) < xfrm_policy_hashmax &&
535 total > hmask)
536 return 1;
537
538 return 0;
539 }
540
541 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
542 {
543 read_lock_bh(&net->xfrm.xfrm_policy_lock);
544 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
545 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
546 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
547 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
548 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
549 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
550 si->spdhcnt = net->xfrm.policy_idx_hmask;
551 si->spdhmcnt = xfrm_policy_hashmax;
552 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
553 }
554 EXPORT_SYMBOL(xfrm_spd_getinfo);
555
556 static DEFINE_MUTEX(hash_resize_mutex);
557 static void xfrm_hash_resize(struct work_struct *work)
558 {
559 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
560 int dir, total;
561
562 mutex_lock(&hash_resize_mutex);
563
564 total = 0;
565 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
566 if (xfrm_bydst_should_resize(net, dir, &total))
567 xfrm_bydst_resize(net, dir);
568 }
569 if (xfrm_byidx_should_resize(net, total))
570 xfrm_byidx_resize(net, total);
571
572 mutex_unlock(&hash_resize_mutex);
573 }
574
575 static void xfrm_hash_rebuild(struct work_struct *work)
576 {
577 struct net *net = container_of(work, struct net,
578 xfrm.policy_hthresh.work);
579 unsigned int hmask;
580 struct xfrm_policy *pol;
581 struct xfrm_policy *policy;
582 struct hlist_head *chain;
583 struct hlist_head *odst;
584 struct hlist_node *newpos;
585 int i;
586 int dir;
587 unsigned seq;
588 u8 lbits4, rbits4, lbits6, rbits6;
589
590 mutex_lock(&hash_resize_mutex);
591
592 /* read selector prefixlen thresholds */
593 do {
594 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
595
596 lbits4 = net->xfrm.policy_hthresh.lbits4;
597 rbits4 = net->xfrm.policy_hthresh.rbits4;
598 lbits6 = net->xfrm.policy_hthresh.lbits6;
599 rbits6 = net->xfrm.policy_hthresh.rbits6;
600 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
601
602 write_lock_bh(&net->xfrm.xfrm_policy_lock);
603
604 /* reset the bydst and inexact table in all directions */
605 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
606 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
607 hmask = net->xfrm.policy_bydst[dir].hmask;
608 odst = net->xfrm.policy_bydst[dir].table;
609 for (i = hmask; i >= 0; i--)
610 INIT_HLIST_HEAD(odst + i);
611 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
612 /* dir out => dst = remote, src = local */
613 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
614 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
615 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
616 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
617 } else {
618 /* dir in/fwd => dst = local, src = remote */
619 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
620 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
621 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
622 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
623 }
624 }
625
626 /* re-insert all policies by order of creation */
627 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
628 newpos = NULL;
629 chain = policy_hash_bysel(net, &policy->selector,
630 policy->family,
631 xfrm_policy_id2dir(policy->index));
632 hlist_for_each_entry(pol, chain, bydst) {
633 if (policy->priority >= pol->priority)
634 newpos = &pol->bydst;
635 else
636 break;
637 }
638 if (newpos)
639 hlist_add_behind(&policy->bydst, newpos);
640 else
641 hlist_add_head(&policy->bydst, chain);
642 }
643
644 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
645
646 mutex_unlock(&hash_resize_mutex);
647 }
648
649 void xfrm_policy_hash_rebuild(struct net *net)
650 {
651 schedule_work(&net->xfrm.policy_hthresh.work);
652 }
653 EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
654
655 /* Generate new index... KAME seems to generate them ordered by cost
656 * of an absolute inpredictability of ordering of rules. This will not pass. */
657 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
658 {
659 static u32 idx_generator;
660
661 for (;;) {
662 struct hlist_head *list;
663 struct xfrm_policy *p;
664 u32 idx;
665 int found;
666
667 if (!index) {
668 idx = (idx_generator | dir);
669 idx_generator += 8;
670 } else {
671 idx = index;
672 index = 0;
673 }
674
675 if (idx == 0)
676 idx = 8;
677 list = net->xfrm.policy_byidx + idx_hash(net, idx);
678 found = 0;
679 hlist_for_each_entry(p, list, byidx) {
680 if (p->index == idx) {
681 found = 1;
682 break;
683 }
684 }
685 if (!found)
686 return idx;
687 }
688 }
689
690 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
691 {
692 u32 *p1 = (u32 *) s1;
693 u32 *p2 = (u32 *) s2;
694 int len = sizeof(struct xfrm_selector) / sizeof(u32);
695 int i;
696
697 for (i = 0; i < len; i++) {
698 if (p1[i] != p2[i])
699 return 1;
700 }
701
702 return 0;
703 }
704
705 static void xfrm_policy_requeue(struct xfrm_policy *old,
706 struct xfrm_policy *new)
707 {
708 struct xfrm_policy_queue *pq = &old->polq;
709 struct sk_buff_head list;
710
711 __skb_queue_head_init(&list);
712
713 spin_lock_bh(&pq->hold_queue.lock);
714 skb_queue_splice_init(&pq->hold_queue, &list);
715 if (del_timer(&pq->hold_timer))
716 xfrm_pol_put(old);
717 spin_unlock_bh(&pq->hold_queue.lock);
718
719 if (skb_queue_empty(&list))
720 return;
721
722 pq = &new->polq;
723
724 spin_lock_bh(&pq->hold_queue.lock);
725 skb_queue_splice(&list, &pq->hold_queue);
726 pq->timeout = XFRM_QUEUE_TMO_MIN;
727 if (!mod_timer(&pq->hold_timer, jiffies))
728 xfrm_pol_hold(new);
729 spin_unlock_bh(&pq->hold_queue.lock);
730 }
731
732 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
733 struct xfrm_policy *pol)
734 {
735 u32 mark = policy->mark.v & policy->mark.m;
736
737 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
738 return true;
739
740 if ((mark & pol->mark.m) == pol->mark.v &&
741 policy->priority == pol->priority)
742 return true;
743
744 return false;
745 }
746
747 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
748 {
749 struct net *net = xp_net(policy);
750 struct xfrm_policy *pol;
751 struct xfrm_policy *delpol;
752 struct hlist_head *chain;
753 struct hlist_node *newpos;
754
755 write_lock_bh(&net->xfrm.xfrm_policy_lock);
756 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
757 delpol = NULL;
758 newpos = NULL;
759 hlist_for_each_entry(pol, chain, bydst) {
760 if (pol->type == policy->type &&
761 !selector_cmp(&pol->selector, &policy->selector) &&
762 xfrm_policy_mark_match(policy, pol) &&
763 xfrm_sec_ctx_match(pol->security, policy->security) &&
764 !WARN_ON(delpol)) {
765 if (excl) {
766 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
767 return -EEXIST;
768 }
769 delpol = pol;
770 if (policy->priority > pol->priority)
771 continue;
772 } else if (policy->priority >= pol->priority) {
773 newpos = &pol->bydst;
774 continue;
775 }
776 if (delpol)
777 break;
778 }
779 if (newpos)
780 hlist_add_behind(&policy->bydst, newpos);
781 else
782 hlist_add_head(&policy->bydst, chain);
783 __xfrm_policy_link(policy, dir);
784 atomic_inc(&net->xfrm.flow_cache_genid);
785
786 /* After previous checking, family can either be AF_INET or AF_INET6 */
787 if (policy->family == AF_INET)
788 rt_genid_bump_ipv4(net);
789 else
790 rt_genid_bump_ipv6(net);
791
792 if (delpol) {
793 xfrm_policy_requeue(delpol, policy);
794 __xfrm_policy_unlink(delpol, dir);
795 }
796 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
797 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
798 policy->curlft.add_time = get_seconds();
799 policy->curlft.use_time = 0;
800 if (!mod_timer(&policy->timer, jiffies + HZ))
801 xfrm_pol_hold(policy);
802 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
803
804 if (delpol)
805 xfrm_policy_kill(delpol);
806 else if (xfrm_bydst_should_resize(net, dir, NULL))
807 schedule_work(&net->xfrm.policy_hash_work);
808
809 return 0;
810 }
811 EXPORT_SYMBOL(xfrm_policy_insert);
812
813 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
814 int dir, struct xfrm_selector *sel,
815 struct xfrm_sec_ctx *ctx, int delete,
816 int *err)
817 {
818 struct xfrm_policy *pol, *ret;
819 struct hlist_head *chain;
820
821 *err = 0;
822 write_lock_bh(&net->xfrm.xfrm_policy_lock);
823 chain = policy_hash_bysel(net, sel, sel->family, dir);
824 ret = NULL;
825 hlist_for_each_entry(pol, chain, bydst) {
826 if (pol->type == type &&
827 (mark & pol->mark.m) == pol->mark.v &&
828 !selector_cmp(sel, &pol->selector) &&
829 xfrm_sec_ctx_match(ctx, pol->security)) {
830 xfrm_pol_hold(pol);
831 if (delete) {
832 *err = security_xfrm_policy_delete(
833 pol->security);
834 if (*err) {
835 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
836 return pol;
837 }
838 __xfrm_policy_unlink(pol, dir);
839 }
840 ret = pol;
841 break;
842 }
843 }
844 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
845
846 if (ret && delete)
847 xfrm_policy_kill(ret);
848 return ret;
849 }
850 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
851
852 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
853 int dir, u32 id, int delete, int *err)
854 {
855 struct xfrm_policy *pol, *ret;
856 struct hlist_head *chain;
857
858 *err = -ENOENT;
859 if (xfrm_policy_id2dir(id) != dir)
860 return NULL;
861
862 *err = 0;
863 write_lock_bh(&net->xfrm.xfrm_policy_lock);
864 chain = net->xfrm.policy_byidx + idx_hash(net, id);
865 ret = NULL;
866 hlist_for_each_entry(pol, chain, byidx) {
867 if (pol->type == type && pol->index == id &&
868 (mark & pol->mark.m) == pol->mark.v) {
869 xfrm_pol_hold(pol);
870 if (delete) {
871 *err = security_xfrm_policy_delete(
872 pol->security);
873 if (*err) {
874 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
875 return pol;
876 }
877 __xfrm_policy_unlink(pol, dir);
878 }
879 ret = pol;
880 break;
881 }
882 }
883 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
884
885 if (ret && delete)
886 xfrm_policy_kill(ret);
887 return ret;
888 }
889 EXPORT_SYMBOL(xfrm_policy_byid);
890
891 #ifdef CONFIG_SECURITY_NETWORK_XFRM
892 static inline int
893 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
894 {
895 int dir, err = 0;
896
897 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
898 struct xfrm_policy *pol;
899 int i;
900
901 hlist_for_each_entry(pol,
902 &net->xfrm.policy_inexact[dir], bydst) {
903 if (pol->type != type)
904 continue;
905 err = security_xfrm_policy_delete(pol->security);
906 if (err) {
907 xfrm_audit_policy_delete(pol, 0, task_valid);
908 return err;
909 }
910 }
911 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
912 hlist_for_each_entry(pol,
913 net->xfrm.policy_bydst[dir].table + i,
914 bydst) {
915 if (pol->type != type)
916 continue;
917 err = security_xfrm_policy_delete(
918 pol->security);
919 if (err) {
920 xfrm_audit_policy_delete(pol, 0,
921 task_valid);
922 return err;
923 }
924 }
925 }
926 }
927 return err;
928 }
929 #else
930 static inline int
931 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
932 {
933 return 0;
934 }
935 #endif
936
937 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
938 {
939 int dir, err = 0, cnt = 0;
940
941 write_lock_bh(&net->xfrm.xfrm_policy_lock);
942
943 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
944 if (err)
945 goto out;
946
947 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
948 struct xfrm_policy *pol;
949 int i;
950
951 again1:
952 hlist_for_each_entry(pol,
953 &net->xfrm.policy_inexact[dir], bydst) {
954 if (pol->type != type)
955 continue;
956 __xfrm_policy_unlink(pol, dir);
957 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
958 cnt++;
959
960 xfrm_audit_policy_delete(pol, 1, task_valid);
961
962 xfrm_policy_kill(pol);
963
964 write_lock_bh(&net->xfrm.xfrm_policy_lock);
965 goto again1;
966 }
967
968 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
969 again2:
970 hlist_for_each_entry(pol,
971 net->xfrm.policy_bydst[dir].table + i,
972 bydst) {
973 if (pol->type != type)
974 continue;
975 __xfrm_policy_unlink(pol, dir);
976 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
977 cnt++;
978
979 xfrm_audit_policy_delete(pol, 1, task_valid);
980 xfrm_policy_kill(pol);
981
982 write_lock_bh(&net->xfrm.xfrm_policy_lock);
983 goto again2;
984 }
985 }
986
987 }
988 if (!cnt)
989 err = -ESRCH;
990 out:
991 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
992 return err;
993 }
994 EXPORT_SYMBOL(xfrm_policy_flush);
995
996 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
997 int (*func)(struct xfrm_policy *, int, int, void*),
998 void *data)
999 {
1000 struct xfrm_policy *pol;
1001 struct xfrm_policy_walk_entry *x;
1002 int error = 0;
1003
1004 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1005 walk->type != XFRM_POLICY_TYPE_ANY)
1006 return -EINVAL;
1007
1008 if (list_empty(&walk->walk.all) && walk->seq != 0)
1009 return 0;
1010
1011 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1012 if (list_empty(&walk->walk.all))
1013 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
1014 else
1015 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
1016 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
1017 if (x->dead)
1018 continue;
1019 pol = container_of(x, struct xfrm_policy, walk);
1020 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1021 walk->type != pol->type)
1022 continue;
1023 error = func(pol, xfrm_policy_id2dir(pol->index),
1024 walk->seq, data);
1025 if (error) {
1026 list_move_tail(&walk->walk.all, &x->all);
1027 goto out;
1028 }
1029 walk->seq++;
1030 }
1031 if (walk->seq == 0) {
1032 error = -ENOENT;
1033 goto out;
1034 }
1035 list_del_init(&walk->walk.all);
1036 out:
1037 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1038 return error;
1039 }
1040 EXPORT_SYMBOL(xfrm_policy_walk);
1041
1042 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1043 {
1044 INIT_LIST_HEAD(&walk->walk.all);
1045 walk->walk.dead = 1;
1046 walk->type = type;
1047 walk->seq = 0;
1048 }
1049 EXPORT_SYMBOL(xfrm_policy_walk_init);
1050
1051 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
1052 {
1053 if (list_empty(&walk->walk.all))
1054 return;
1055
1056 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
1057 list_del(&walk->walk.all);
1058 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1059 }
1060 EXPORT_SYMBOL(xfrm_policy_walk_done);
1061
1062 /*
1063 * Find policy to apply to this flow.
1064 *
1065 * Returns 0 if policy found, else an -errno.
1066 */
1067 static int xfrm_policy_match(const struct xfrm_policy *pol,
1068 const struct flowi *fl,
1069 u8 type, u16 family, int dir)
1070 {
1071 const struct xfrm_selector *sel = &pol->selector;
1072 int ret = -ESRCH;
1073 bool match;
1074
1075 if (pol->family != family ||
1076 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
1077 pol->type != type)
1078 return ret;
1079
1080 match = xfrm_selector_match(sel, fl, family);
1081 if (match)
1082 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
1083 dir);
1084
1085 return ret;
1086 }
1087
1088 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
1089 const struct flowi *fl,
1090 u16 family, u8 dir)
1091 {
1092 int err;
1093 struct xfrm_policy *pol, *ret;
1094 const xfrm_address_t *daddr, *saddr;
1095 struct hlist_head *chain;
1096 u32 priority = ~0U;
1097
1098 daddr = xfrm_flowi_daddr(fl, family);
1099 saddr = xfrm_flowi_saddr(fl, family);
1100 if (unlikely(!daddr || !saddr))
1101 return NULL;
1102
1103 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1104 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1105 ret = NULL;
1106 hlist_for_each_entry(pol, chain, bydst) {
1107 err = xfrm_policy_match(pol, fl, type, family, dir);
1108 if (err) {
1109 if (err == -ESRCH)
1110 continue;
1111 else {
1112 ret = ERR_PTR(err);
1113 goto fail;
1114 }
1115 } else {
1116 ret = pol;
1117 priority = ret->priority;
1118 break;
1119 }
1120 }
1121 chain = &net->xfrm.policy_inexact[dir];
1122 hlist_for_each_entry(pol, chain, bydst) {
1123 err = xfrm_policy_match(pol, fl, type, family, dir);
1124 if (err) {
1125 if (err == -ESRCH)
1126 continue;
1127 else {
1128 ret = ERR_PTR(err);
1129 goto fail;
1130 }
1131 } else if (pol->priority < priority) {
1132 ret = pol;
1133 break;
1134 }
1135 }
1136 if (ret)
1137 xfrm_pol_hold(ret);
1138 fail:
1139 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1140
1141 return ret;
1142 }
1143
1144 static struct xfrm_policy *
1145 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1146 {
1147 #ifdef CONFIG_XFRM_SUB_POLICY
1148 struct xfrm_policy *pol;
1149
1150 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1151 if (pol != NULL)
1152 return pol;
1153 #endif
1154 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1155 }
1156
1157 static int flow_to_policy_dir(int dir)
1158 {
1159 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1160 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1161 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1162 return dir;
1163
1164 switch (dir) {
1165 default:
1166 case FLOW_DIR_IN:
1167 return XFRM_POLICY_IN;
1168 case FLOW_DIR_OUT:
1169 return XFRM_POLICY_OUT;
1170 case FLOW_DIR_FWD:
1171 return XFRM_POLICY_FWD;
1172 }
1173 }
1174
1175 static struct flow_cache_object *
1176 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1177 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1178 {
1179 struct xfrm_policy *pol;
1180
1181 if (old_obj)
1182 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1183
1184 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1185 if (IS_ERR_OR_NULL(pol))
1186 return ERR_CAST(pol);
1187
1188 /* Resolver returns two references:
1189 * one for cache and one for caller of flow_cache_lookup() */
1190 xfrm_pol_hold(pol);
1191
1192 return &pol->flo;
1193 }
1194
1195 static inline int policy_to_flow_dir(int dir)
1196 {
1197 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1198 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1199 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1200 return dir;
1201 switch (dir) {
1202 default:
1203 case XFRM_POLICY_IN:
1204 return FLOW_DIR_IN;
1205 case XFRM_POLICY_OUT:
1206 return FLOW_DIR_OUT;
1207 case XFRM_POLICY_FWD:
1208 return FLOW_DIR_FWD;
1209 }
1210 }
1211
1212 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1213 const struct flowi *fl)
1214 {
1215 struct xfrm_policy *pol;
1216 struct net *net = sock_net(sk);
1217
1218 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1219 if ((pol = sk->sk_policy[dir]) != NULL) {
1220 bool match = xfrm_selector_match(&pol->selector, fl,
1221 sk->sk_family);
1222 int err = 0;
1223
1224 if (match) {
1225 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1226 pol = NULL;
1227 goto out;
1228 }
1229 err = security_xfrm_policy_lookup(pol->security,
1230 fl->flowi_secid,
1231 policy_to_flow_dir(dir));
1232 if (!err)
1233 xfrm_pol_hold(pol);
1234 else if (err == -ESRCH)
1235 pol = NULL;
1236 else
1237 pol = ERR_PTR(err);
1238 } else
1239 pol = NULL;
1240 }
1241 out:
1242 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1243 return pol;
1244 }
1245
1246 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1247 {
1248 struct net *net = xp_net(pol);
1249
1250 list_add(&pol->walk.all, &net->xfrm.policy_all);
1251 net->xfrm.policy_count[dir]++;
1252 xfrm_pol_hold(pol);
1253 }
1254
1255 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1256 int dir)
1257 {
1258 struct net *net = xp_net(pol);
1259
1260 if (list_empty(&pol->walk.all))
1261 return NULL;
1262
1263 /* Socket policies are not hashed. */
1264 if (!hlist_unhashed(&pol->bydst)) {
1265 hlist_del(&pol->bydst);
1266 hlist_del(&pol->byidx);
1267 }
1268
1269 list_del_init(&pol->walk.all);
1270 net->xfrm.policy_count[dir]--;
1271
1272 return pol;
1273 }
1274
1275 static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1276 {
1277 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1278 }
1279
1280 static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1281 {
1282 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1283 }
1284
1285 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1286 {
1287 struct net *net = xp_net(pol);
1288
1289 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1290 pol = __xfrm_policy_unlink(pol, dir);
1291 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1292 if (pol) {
1293 xfrm_policy_kill(pol);
1294 return 0;
1295 }
1296 return -ENOENT;
1297 }
1298 EXPORT_SYMBOL(xfrm_policy_delete);
1299
1300 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1301 {
1302 struct net *net = xp_net(pol);
1303 struct xfrm_policy *old_pol;
1304
1305 #ifdef CONFIG_XFRM_SUB_POLICY
1306 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1307 return -EINVAL;
1308 #endif
1309
1310 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1311 old_pol = sk->sk_policy[dir];
1312 sk->sk_policy[dir] = pol;
1313 if (pol) {
1314 pol->curlft.add_time = get_seconds();
1315 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1316 xfrm_sk_policy_link(pol, dir);
1317 }
1318 if (old_pol) {
1319 if (pol)
1320 xfrm_policy_requeue(old_pol, pol);
1321
1322 /* Unlinking succeeds always. This is the only function
1323 * allowed to delete or replace socket policy.
1324 */
1325 xfrm_sk_policy_unlink(old_pol, dir);
1326 }
1327 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1328
1329 if (old_pol) {
1330 xfrm_policy_kill(old_pol);
1331 }
1332 return 0;
1333 }
1334
1335 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1336 {
1337 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1338 struct net *net = xp_net(old);
1339
1340 if (newp) {
1341 newp->selector = old->selector;
1342 if (security_xfrm_policy_clone(old->security,
1343 &newp->security)) {
1344 kfree(newp);
1345 return NULL; /* ENOMEM */
1346 }
1347 newp->lft = old->lft;
1348 newp->curlft = old->curlft;
1349 newp->mark = old->mark;
1350 newp->action = old->action;
1351 newp->flags = old->flags;
1352 newp->xfrm_nr = old->xfrm_nr;
1353 newp->index = old->index;
1354 newp->type = old->type;
1355 memcpy(newp->xfrm_vec, old->xfrm_vec,
1356 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1357 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1358 xfrm_sk_policy_link(newp, dir);
1359 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1360 xfrm_pol_put(newp);
1361 }
1362 return newp;
1363 }
1364
1365 int __xfrm_sk_clone_policy(struct sock *sk)
1366 {
1367 struct xfrm_policy *p0 = sk->sk_policy[0],
1368 *p1 = sk->sk_policy[1];
1369
1370 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1371 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1372 return -ENOMEM;
1373 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1374 return -ENOMEM;
1375 return 0;
1376 }
1377
1378 static int
1379 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1380 unsigned short family)
1381 {
1382 int err;
1383 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1384
1385 if (unlikely(afinfo == NULL))
1386 return -EINVAL;
1387 err = afinfo->get_saddr(net, local, remote);
1388 xfrm_policy_put_afinfo(afinfo);
1389 return err;
1390 }
1391
1392 /* Resolve list of templates for the flow, given policy. */
1393
1394 static int
1395 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1396 struct xfrm_state **xfrm, unsigned short family)
1397 {
1398 struct net *net = xp_net(policy);
1399 int nx;
1400 int i, error;
1401 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1402 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1403 xfrm_address_t tmp;
1404
1405 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1406 struct xfrm_state *x;
1407 xfrm_address_t *remote = daddr;
1408 xfrm_address_t *local = saddr;
1409 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1410
1411 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1412 tmpl->mode == XFRM_MODE_BEET) {
1413 remote = &tmpl->id.daddr;
1414 local = &tmpl->saddr;
1415 if (xfrm_addr_any(local, tmpl->encap_family)) {
1416 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1417 if (error)
1418 goto fail;
1419 local = &tmp;
1420 }
1421 }
1422
1423 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1424
1425 if (x && x->km.state == XFRM_STATE_VALID) {
1426 xfrm[nx++] = x;
1427 daddr = remote;
1428 saddr = local;
1429 continue;
1430 }
1431 if (x) {
1432 error = (x->km.state == XFRM_STATE_ERROR ?
1433 -EINVAL : -EAGAIN);
1434 xfrm_state_put(x);
1435 } else if (error == -ESRCH) {
1436 error = -EAGAIN;
1437 }
1438
1439 if (!tmpl->optional)
1440 goto fail;
1441 }
1442 return nx;
1443
1444 fail:
1445 for (nx--; nx >= 0; nx--)
1446 xfrm_state_put(xfrm[nx]);
1447 return error;
1448 }
1449
1450 static int
1451 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1452 struct xfrm_state **xfrm, unsigned short family)
1453 {
1454 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1455 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1456 int cnx = 0;
1457 int error;
1458 int ret;
1459 int i;
1460
1461 for (i = 0; i < npols; i++) {
1462 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1463 error = -ENOBUFS;
1464 goto fail;
1465 }
1466
1467 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1468 if (ret < 0) {
1469 error = ret;
1470 goto fail;
1471 } else
1472 cnx += ret;
1473 }
1474
1475 /* found states are sorted for outbound processing */
1476 if (npols > 1)
1477 xfrm_state_sort(xfrm, tpp, cnx, family);
1478
1479 return cnx;
1480
1481 fail:
1482 for (cnx--; cnx >= 0; cnx--)
1483 xfrm_state_put(tpp[cnx]);
1484 return error;
1485
1486 }
1487
1488 /* Check that the bundle accepts the flow and its components are
1489 * still valid.
1490 */
1491
1492 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1493 {
1494 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1495 int tos;
1496
1497 if (!afinfo)
1498 return -EINVAL;
1499
1500 tos = afinfo->get_tos(fl);
1501
1502 xfrm_policy_put_afinfo(afinfo);
1503
1504 return tos;
1505 }
1506
1507 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1508 {
1509 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1510 struct dst_entry *dst = &xdst->u.dst;
1511
1512 if (xdst->route == NULL) {
1513 /* Dummy bundle - if it has xfrms we were not
1514 * able to build bundle as template resolution failed.
1515 * It means we need to try again resolving. */
1516 if (xdst->num_xfrms > 0)
1517 return NULL;
1518 } else if (dst->flags & DST_XFRM_QUEUE) {
1519 return NULL;
1520 } else {
1521 /* Real bundle */
1522 if (stale_bundle(dst))
1523 return NULL;
1524 }
1525
1526 dst_hold(dst);
1527 return flo;
1528 }
1529
1530 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1531 {
1532 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1533 struct dst_entry *dst = &xdst->u.dst;
1534
1535 if (!xdst->route)
1536 return 0;
1537 if (stale_bundle(dst))
1538 return 0;
1539
1540 return 1;
1541 }
1542
1543 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1544 {
1545 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1546 struct dst_entry *dst = &xdst->u.dst;
1547
1548 dst_free(dst);
1549 }
1550
1551 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1552 .get = xfrm_bundle_flo_get,
1553 .check = xfrm_bundle_flo_check,
1554 .delete = xfrm_bundle_flo_delete,
1555 };
1556
1557 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1558 {
1559 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1560 struct dst_ops *dst_ops;
1561 struct xfrm_dst *xdst;
1562
1563 if (!afinfo)
1564 return ERR_PTR(-EINVAL);
1565
1566 switch (family) {
1567 case AF_INET:
1568 dst_ops = &net->xfrm.xfrm4_dst_ops;
1569 break;
1570 #if IS_ENABLED(CONFIG_IPV6)
1571 case AF_INET6:
1572 dst_ops = &net->xfrm.xfrm6_dst_ops;
1573 break;
1574 #endif
1575 default:
1576 BUG();
1577 }
1578 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1579
1580 if (likely(xdst)) {
1581 struct dst_entry *dst = &xdst->u.dst;
1582
1583 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1584 xdst->flo.ops = &xfrm_bundle_fc_ops;
1585 if (afinfo->init_dst)
1586 afinfo->init_dst(net, xdst);
1587 } else
1588 xdst = ERR_PTR(-ENOBUFS);
1589
1590 xfrm_policy_put_afinfo(afinfo);
1591
1592 return xdst;
1593 }
1594
1595 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1596 int nfheader_len)
1597 {
1598 struct xfrm_policy_afinfo *afinfo =
1599 xfrm_policy_get_afinfo(dst->ops->family);
1600 int err;
1601
1602 if (!afinfo)
1603 return -EINVAL;
1604
1605 err = afinfo->init_path(path, dst, nfheader_len);
1606
1607 xfrm_policy_put_afinfo(afinfo);
1608
1609 return err;
1610 }
1611
1612 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1613 const struct flowi *fl)
1614 {
1615 struct xfrm_policy_afinfo *afinfo =
1616 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1617 int err;
1618
1619 if (!afinfo)
1620 return -EINVAL;
1621
1622 err = afinfo->fill_dst(xdst, dev, fl);
1623
1624 xfrm_policy_put_afinfo(afinfo);
1625
1626 return err;
1627 }
1628
1629
1630 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1631 * all the metrics... Shortly, bundle a bundle.
1632 */
1633
1634 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1635 struct xfrm_state **xfrm, int nx,
1636 const struct flowi *fl,
1637 struct dst_entry *dst)
1638 {
1639 struct net *net = xp_net(policy);
1640 unsigned long now = jiffies;
1641 struct net_device *dev;
1642 struct xfrm_mode *inner_mode;
1643 struct dst_entry *dst_prev = NULL;
1644 struct dst_entry *dst0 = NULL;
1645 int i = 0;
1646 int err;
1647 int header_len = 0;
1648 int nfheader_len = 0;
1649 int trailer_len = 0;
1650 int tos;
1651 int family = policy->selector.family;
1652 xfrm_address_t saddr, daddr;
1653
1654 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1655
1656 tos = xfrm_get_tos(fl, family);
1657 err = tos;
1658 if (tos < 0)
1659 goto put_states;
1660
1661 dst_hold(dst);
1662
1663 for (; i < nx; i++) {
1664 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1665 struct dst_entry *dst1 = &xdst->u.dst;
1666
1667 err = PTR_ERR(xdst);
1668 if (IS_ERR(xdst)) {
1669 dst_release(dst);
1670 goto put_states;
1671 }
1672
1673 if (xfrm[i]->sel.family == AF_UNSPEC) {
1674 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1675 xfrm_af2proto(family));
1676 if (!inner_mode) {
1677 err = -EAFNOSUPPORT;
1678 dst_release(dst);
1679 goto put_states;
1680 }
1681 } else
1682 inner_mode = xfrm[i]->inner_mode;
1683
1684 if (!dst_prev)
1685 dst0 = dst1;
1686 else {
1687 dst_prev->child = dst_clone(dst1);
1688 dst1->flags |= DST_NOHASH;
1689 }
1690
1691 xdst->route = dst;
1692 dst_copy_metrics(dst1, dst);
1693
1694 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1695 family = xfrm[i]->props.family;
1696 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1697 family);
1698 err = PTR_ERR(dst);
1699 if (IS_ERR(dst))
1700 goto put_states;
1701 } else
1702 dst_hold(dst);
1703
1704 dst1->xfrm = xfrm[i];
1705 xdst->xfrm_genid = xfrm[i]->genid;
1706
1707 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1708 dst1->flags |= DST_HOST;
1709 dst1->lastuse = now;
1710
1711 dst1->input = dst_discard;
1712 dst1->output = inner_mode->afinfo->output;
1713
1714 dst1->next = dst_prev;
1715 dst_prev = dst1;
1716
1717 header_len += xfrm[i]->props.header_len;
1718 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1719 nfheader_len += xfrm[i]->props.header_len;
1720 trailer_len += xfrm[i]->props.trailer_len;
1721 }
1722
1723 dst_prev->child = dst;
1724 dst0->path = dst;
1725
1726 err = -ENODEV;
1727 dev = dst->dev;
1728 if (!dev)
1729 goto free_dst;
1730
1731 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1732 xfrm_init_pmtu(dst_prev);
1733
1734 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1735 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1736
1737 err = xfrm_fill_dst(xdst, dev, fl);
1738 if (err)
1739 goto free_dst;
1740
1741 dst_prev->header_len = header_len;
1742 dst_prev->trailer_len = trailer_len;
1743 header_len -= xdst->u.dst.xfrm->props.header_len;
1744 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1745 }
1746
1747 out:
1748 return dst0;
1749
1750 put_states:
1751 for (; i < nx; i++)
1752 xfrm_state_put(xfrm[i]);
1753 free_dst:
1754 if (dst0)
1755 dst_free(dst0);
1756 dst0 = ERR_PTR(err);
1757 goto out;
1758 }
1759
1760 #ifdef CONFIG_XFRM_SUB_POLICY
1761 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1762 {
1763 if (!*target) {
1764 *target = kmalloc(size, GFP_ATOMIC);
1765 if (!*target)
1766 return -ENOMEM;
1767 }
1768
1769 memcpy(*target, src, size);
1770 return 0;
1771 }
1772 #endif
1773
1774 static int xfrm_dst_update_parent(struct dst_entry *dst,
1775 const struct xfrm_selector *sel)
1776 {
1777 #ifdef CONFIG_XFRM_SUB_POLICY
1778 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1779 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1780 sel, sizeof(*sel));
1781 #else
1782 return 0;
1783 #endif
1784 }
1785
1786 static int xfrm_dst_update_origin(struct dst_entry *dst,
1787 const struct flowi *fl)
1788 {
1789 #ifdef CONFIG_XFRM_SUB_POLICY
1790 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1791 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1792 #else
1793 return 0;
1794 #endif
1795 }
1796
1797 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1798 struct xfrm_policy **pols,
1799 int *num_pols, int *num_xfrms)
1800 {
1801 int i;
1802
1803 if (*num_pols == 0 || !pols[0]) {
1804 *num_pols = 0;
1805 *num_xfrms = 0;
1806 return 0;
1807 }
1808 if (IS_ERR(pols[0]))
1809 return PTR_ERR(pols[0]);
1810
1811 *num_xfrms = pols[0]->xfrm_nr;
1812
1813 #ifdef CONFIG_XFRM_SUB_POLICY
1814 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1815 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1816 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1817 XFRM_POLICY_TYPE_MAIN,
1818 fl, family,
1819 XFRM_POLICY_OUT);
1820 if (pols[1]) {
1821 if (IS_ERR(pols[1])) {
1822 xfrm_pols_put(pols, *num_pols);
1823 return PTR_ERR(pols[1]);
1824 }
1825 (*num_pols)++;
1826 (*num_xfrms) += pols[1]->xfrm_nr;
1827 }
1828 }
1829 #endif
1830 for (i = 0; i < *num_pols; i++) {
1831 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1832 *num_xfrms = -1;
1833 break;
1834 }
1835 }
1836
1837 return 0;
1838
1839 }
1840
1841 static struct xfrm_dst *
1842 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1843 const struct flowi *fl, u16 family,
1844 struct dst_entry *dst_orig)
1845 {
1846 struct net *net = xp_net(pols[0]);
1847 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1848 struct dst_entry *dst;
1849 struct xfrm_dst *xdst;
1850 int err;
1851
1852 /* Try to instantiate a bundle */
1853 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1854 if (err <= 0) {
1855 if (err != 0 && err != -EAGAIN)
1856 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1857 return ERR_PTR(err);
1858 }
1859
1860 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1861 if (IS_ERR(dst)) {
1862 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1863 return ERR_CAST(dst);
1864 }
1865
1866 xdst = (struct xfrm_dst *)dst;
1867 xdst->num_xfrms = err;
1868 if (num_pols > 1)
1869 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1870 else
1871 err = xfrm_dst_update_origin(dst, fl);
1872 if (unlikely(err)) {
1873 dst_free(dst);
1874 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1875 return ERR_PTR(err);
1876 }
1877
1878 xdst->num_pols = num_pols;
1879 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1880 xdst->policy_genid = atomic_read(&pols[0]->genid);
1881
1882 return xdst;
1883 }
1884
1885 static void xfrm_policy_queue_process(unsigned long arg)
1886 {
1887 struct sk_buff *skb;
1888 struct sock *sk;
1889 struct dst_entry *dst;
1890 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1891 struct xfrm_policy_queue *pq = &pol->polq;
1892 struct flowi fl;
1893 struct sk_buff_head list;
1894
1895 spin_lock(&pq->hold_queue.lock);
1896 skb = skb_peek(&pq->hold_queue);
1897 if (!skb) {
1898 spin_unlock(&pq->hold_queue.lock);
1899 goto out;
1900 }
1901 dst = skb_dst(skb);
1902 sk = skb->sk;
1903 xfrm_decode_session(skb, &fl, dst->ops->family);
1904 spin_unlock(&pq->hold_queue.lock);
1905
1906 dst_hold(dst->path);
1907 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1908 sk, 0);
1909 if (IS_ERR(dst))
1910 goto purge_queue;
1911
1912 if (dst->flags & DST_XFRM_QUEUE) {
1913 dst_release(dst);
1914
1915 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1916 goto purge_queue;
1917
1918 pq->timeout = pq->timeout << 1;
1919 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1920 xfrm_pol_hold(pol);
1921 goto out;
1922 }
1923
1924 dst_release(dst);
1925
1926 __skb_queue_head_init(&list);
1927
1928 spin_lock(&pq->hold_queue.lock);
1929 pq->timeout = 0;
1930 skb_queue_splice_init(&pq->hold_queue, &list);
1931 spin_unlock(&pq->hold_queue.lock);
1932
1933 while (!skb_queue_empty(&list)) {
1934 skb = __skb_dequeue(&list);
1935
1936 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1937 dst_hold(skb_dst(skb)->path);
1938 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1939 &fl, skb->sk, 0);
1940 if (IS_ERR(dst)) {
1941 kfree_skb(skb);
1942 continue;
1943 }
1944
1945 nf_reset(skb);
1946 skb_dst_drop(skb);
1947 skb_dst_set(skb, dst);
1948
1949 dst_output(skb);
1950 }
1951
1952 out:
1953 xfrm_pol_put(pol);
1954 return;
1955
1956 purge_queue:
1957 pq->timeout = 0;
1958 xfrm_queue_purge(&pq->hold_queue);
1959 xfrm_pol_put(pol);
1960 }
1961
1962 static int xdst_queue_output(struct sock *sk, struct sk_buff *skb)
1963 {
1964 unsigned long sched_next;
1965 struct dst_entry *dst = skb_dst(skb);
1966 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1967 struct xfrm_policy *pol = xdst->pols[0];
1968 struct xfrm_policy_queue *pq = &pol->polq;
1969
1970 if (unlikely(skb_fclone_busy(sk, skb))) {
1971 kfree_skb(skb);
1972 return 0;
1973 }
1974
1975 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1976 kfree_skb(skb);
1977 return -EAGAIN;
1978 }
1979
1980 skb_dst_force(skb);
1981
1982 spin_lock_bh(&pq->hold_queue.lock);
1983
1984 if (!pq->timeout)
1985 pq->timeout = XFRM_QUEUE_TMO_MIN;
1986
1987 sched_next = jiffies + pq->timeout;
1988
1989 if (del_timer(&pq->hold_timer)) {
1990 if (time_before(pq->hold_timer.expires, sched_next))
1991 sched_next = pq->hold_timer.expires;
1992 xfrm_pol_put(pol);
1993 }
1994
1995 __skb_queue_tail(&pq->hold_queue, skb);
1996 if (!mod_timer(&pq->hold_timer, sched_next))
1997 xfrm_pol_hold(pol);
1998
1999 spin_unlock_bh(&pq->hold_queue.lock);
2000
2001 return 0;
2002 }
2003
2004 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
2005 struct xfrm_flo *xflo,
2006 const struct flowi *fl,
2007 int num_xfrms,
2008 u16 family)
2009 {
2010 int err;
2011 struct net_device *dev;
2012 struct dst_entry *dst;
2013 struct dst_entry *dst1;
2014 struct xfrm_dst *xdst;
2015
2016 xdst = xfrm_alloc_dst(net, family);
2017 if (IS_ERR(xdst))
2018 return xdst;
2019
2020 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2021 net->xfrm.sysctl_larval_drop ||
2022 num_xfrms <= 0)
2023 return xdst;
2024
2025 dst = xflo->dst_orig;
2026 dst1 = &xdst->u.dst;
2027 dst_hold(dst);
2028 xdst->route = dst;
2029
2030 dst_copy_metrics(dst1, dst);
2031
2032 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2033 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2034 dst1->lastuse = jiffies;
2035
2036 dst1->input = dst_discard;
2037 dst1->output = xdst_queue_output;
2038
2039 dst_hold(dst);
2040 dst1->child = dst;
2041 dst1->path = dst;
2042
2043 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2044
2045 err = -ENODEV;
2046 dev = dst->dev;
2047 if (!dev)
2048 goto free_dst;
2049
2050 err = xfrm_fill_dst(xdst, dev, fl);
2051 if (err)
2052 goto free_dst;
2053
2054 out:
2055 return xdst;
2056
2057 free_dst:
2058 dst_release(dst1);
2059 xdst = ERR_PTR(err);
2060 goto out;
2061 }
2062
2063 static struct flow_cache_object *
2064 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
2065 struct flow_cache_object *oldflo, void *ctx)
2066 {
2067 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
2068 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2069 struct xfrm_dst *xdst, *new_xdst;
2070 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2071
2072 /* Check if the policies from old bundle are usable */
2073 xdst = NULL;
2074 if (oldflo) {
2075 xdst = container_of(oldflo, struct xfrm_dst, flo);
2076 num_pols = xdst->num_pols;
2077 num_xfrms = xdst->num_xfrms;
2078 pol_dead = 0;
2079 for (i = 0; i < num_pols; i++) {
2080 pols[i] = xdst->pols[i];
2081 pol_dead |= pols[i]->walk.dead;
2082 }
2083 if (pol_dead) {
2084 dst_free(&xdst->u.dst);
2085 xdst = NULL;
2086 num_pols = 0;
2087 num_xfrms = 0;
2088 oldflo = NULL;
2089 }
2090 }
2091
2092 /* Resolve policies to use if we couldn't get them from
2093 * previous cache entry */
2094 if (xdst == NULL) {
2095 num_pols = 1;
2096 pols[0] = __xfrm_policy_lookup(net, fl, family,
2097 flow_to_policy_dir(dir));
2098 err = xfrm_expand_policies(fl, family, pols,
2099 &num_pols, &num_xfrms);
2100 if (err < 0)
2101 goto inc_error;
2102 if (num_pols == 0)
2103 return NULL;
2104 if (num_xfrms <= 0)
2105 goto make_dummy_bundle;
2106 }
2107
2108 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2109 xflo->dst_orig);
2110 if (IS_ERR(new_xdst)) {
2111 err = PTR_ERR(new_xdst);
2112 if (err != -EAGAIN)
2113 goto error;
2114 if (oldflo == NULL)
2115 goto make_dummy_bundle;
2116 dst_hold(&xdst->u.dst);
2117 return oldflo;
2118 } else if (new_xdst == NULL) {
2119 num_xfrms = 0;
2120 if (oldflo == NULL)
2121 goto make_dummy_bundle;
2122 xdst->num_xfrms = 0;
2123 dst_hold(&xdst->u.dst);
2124 return oldflo;
2125 }
2126
2127 /* Kill the previous bundle */
2128 if (xdst) {
2129 /* The policies were stolen for newly generated bundle */
2130 xdst->num_pols = 0;
2131 dst_free(&xdst->u.dst);
2132 }
2133
2134 /* Flow cache does not have reference, it dst_free()'s,
2135 * but we do need to return one reference for original caller */
2136 dst_hold(&new_xdst->u.dst);
2137 return &new_xdst->flo;
2138
2139 make_dummy_bundle:
2140 /* We found policies, but there's no bundles to instantiate:
2141 * either because the policy blocks, has no transformations or
2142 * we could not build template (no xfrm_states).*/
2143 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2144 if (IS_ERR(xdst)) {
2145 xfrm_pols_put(pols, num_pols);
2146 return ERR_CAST(xdst);
2147 }
2148 xdst->num_pols = num_pols;
2149 xdst->num_xfrms = num_xfrms;
2150 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2151
2152 dst_hold(&xdst->u.dst);
2153 return &xdst->flo;
2154
2155 inc_error:
2156 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2157 error:
2158 if (xdst != NULL)
2159 dst_free(&xdst->u.dst);
2160 else
2161 xfrm_pols_put(pols, num_pols);
2162 return ERR_PTR(err);
2163 }
2164
2165 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2166 struct dst_entry *dst_orig)
2167 {
2168 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2169 struct dst_entry *ret;
2170
2171 if (!afinfo) {
2172 dst_release(dst_orig);
2173 return ERR_PTR(-EINVAL);
2174 } else {
2175 ret = afinfo->blackhole_route(net, dst_orig);
2176 }
2177 xfrm_policy_put_afinfo(afinfo);
2178
2179 return ret;
2180 }
2181
2182 /* Main function: finds/creates a bundle for given flow.
2183 *
2184 * At the moment we eat a raw IP route. Mostly to speed up lookups
2185 * on interfaces with disabled IPsec.
2186 */
2187 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2188 const struct flowi *fl,
2189 struct sock *sk, int flags)
2190 {
2191 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2192 struct flow_cache_object *flo;
2193 struct xfrm_dst *xdst;
2194 struct dst_entry *dst, *route;
2195 u16 family = dst_orig->ops->family;
2196 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2197 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2198
2199 dst = NULL;
2200 xdst = NULL;
2201 route = NULL;
2202
2203 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2204 num_pols = 1;
2205 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2206 err = xfrm_expand_policies(fl, family, pols,
2207 &num_pols, &num_xfrms);
2208 if (err < 0)
2209 goto dropdst;
2210
2211 if (num_pols) {
2212 if (num_xfrms <= 0) {
2213 drop_pols = num_pols;
2214 goto no_transform;
2215 }
2216
2217 xdst = xfrm_resolve_and_create_bundle(
2218 pols, num_pols, fl,
2219 family, dst_orig);
2220 if (IS_ERR(xdst)) {
2221 xfrm_pols_put(pols, num_pols);
2222 err = PTR_ERR(xdst);
2223 goto dropdst;
2224 } else if (xdst == NULL) {
2225 num_xfrms = 0;
2226 drop_pols = num_pols;
2227 goto no_transform;
2228 }
2229
2230 dst_hold(&xdst->u.dst);
2231 xdst->u.dst.flags |= DST_NOCACHE;
2232 route = xdst->route;
2233 }
2234 }
2235
2236 if (xdst == NULL) {
2237 struct xfrm_flo xflo;
2238
2239 xflo.dst_orig = dst_orig;
2240 xflo.flags = flags;
2241
2242 /* To accelerate a bit... */
2243 if ((dst_orig->flags & DST_NOXFRM) ||
2244 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2245 goto nopol;
2246
2247 flo = flow_cache_lookup(net, fl, family, dir,
2248 xfrm_bundle_lookup, &xflo);
2249 if (flo == NULL)
2250 goto nopol;
2251 if (IS_ERR(flo)) {
2252 err = PTR_ERR(flo);
2253 goto dropdst;
2254 }
2255 xdst = container_of(flo, struct xfrm_dst, flo);
2256
2257 num_pols = xdst->num_pols;
2258 num_xfrms = xdst->num_xfrms;
2259 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2260 route = xdst->route;
2261 }
2262
2263 dst = &xdst->u.dst;
2264 if (route == NULL && num_xfrms > 0) {
2265 /* The only case when xfrm_bundle_lookup() returns a
2266 * bundle with null route, is when the template could
2267 * not be resolved. It means policies are there, but
2268 * bundle could not be created, since we don't yet
2269 * have the xfrm_state's. We need to wait for KM to
2270 * negotiate new SA's or bail out with error.*/
2271 if (net->xfrm.sysctl_larval_drop) {
2272 dst_release(dst);
2273 xfrm_pols_put(pols, drop_pols);
2274 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2275
2276 return ERR_PTR(-EREMOTE);
2277 }
2278
2279 err = -EAGAIN;
2280
2281 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2282 goto error;
2283 }
2284
2285 no_transform:
2286 if (num_pols == 0)
2287 goto nopol;
2288
2289 if ((flags & XFRM_LOOKUP_ICMP) &&
2290 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2291 err = -ENOENT;
2292 goto error;
2293 }
2294
2295 for (i = 0; i < num_pols; i++)
2296 pols[i]->curlft.use_time = get_seconds();
2297
2298 if (num_xfrms < 0) {
2299 /* Prohibit the flow */
2300 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2301 err = -EPERM;
2302 goto error;
2303 } else if (num_xfrms > 0) {
2304 /* Flow transformed */
2305 dst_release(dst_orig);
2306 } else {
2307 /* Flow passes untransformed */
2308 dst_release(dst);
2309 dst = dst_orig;
2310 }
2311 ok:
2312 xfrm_pols_put(pols, drop_pols);
2313 if (dst && dst->xfrm &&
2314 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2315 dst->flags |= DST_XFRM_TUNNEL;
2316 return dst;
2317
2318 nopol:
2319 if (!(flags & XFRM_LOOKUP_ICMP)) {
2320 dst = dst_orig;
2321 goto ok;
2322 }
2323 err = -ENOENT;
2324 error:
2325 dst_release(dst);
2326 dropdst:
2327 dst_release(dst_orig);
2328 xfrm_pols_put(pols, drop_pols);
2329 return ERR_PTR(err);
2330 }
2331 EXPORT_SYMBOL(xfrm_lookup);
2332
2333 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2334 * Otherwise we may send out blackholed packets.
2335 */
2336 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2337 const struct flowi *fl,
2338 struct sock *sk, int flags)
2339 {
2340 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2341 flags | XFRM_LOOKUP_QUEUE);
2342
2343 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2344 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2345
2346 return dst;
2347 }
2348 EXPORT_SYMBOL(xfrm_lookup_route);
2349
2350 static inline int
2351 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2352 {
2353 struct xfrm_state *x;
2354
2355 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2356 return 0;
2357 x = skb->sp->xvec[idx];
2358 if (!x->type->reject)
2359 return 0;
2360 return x->type->reject(x, skb, fl);
2361 }
2362
2363 /* When skb is transformed back to its "native" form, we have to
2364 * check policy restrictions. At the moment we make this in maximally
2365 * stupid way. Shame on me. :-) Of course, connected sockets must
2366 * have policy cached at them.
2367 */
2368
2369 static inline int
2370 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2371 unsigned short family)
2372 {
2373 if (xfrm_state_kern(x))
2374 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2375 return x->id.proto == tmpl->id.proto &&
2376 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2377 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2378 x->props.mode == tmpl->mode &&
2379 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2380 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2381 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2382 xfrm_state_addr_cmp(tmpl, x, family));
2383 }
2384
2385 /*
2386 * 0 or more than 0 is returned when validation is succeeded (either bypass
2387 * because of optional transport mode, or next index of the mathced secpath
2388 * state with the template.
2389 * -1 is returned when no matching template is found.
2390 * Otherwise "-2 - errored_index" is returned.
2391 */
2392 static inline int
2393 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2394 unsigned short family)
2395 {
2396 int idx = start;
2397
2398 if (tmpl->optional) {
2399 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2400 return start;
2401 } else
2402 start = -1;
2403 for (; idx < sp->len; idx++) {
2404 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2405 return ++idx;
2406 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2407 if (start == -1)
2408 start = -2-idx;
2409 break;
2410 }
2411 }
2412 return start;
2413 }
2414
2415 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2416 unsigned int family, int reverse)
2417 {
2418 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2419 int err;
2420
2421 if (unlikely(afinfo == NULL))
2422 return -EAFNOSUPPORT;
2423
2424 afinfo->decode_session(skb, fl, reverse);
2425 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2426 xfrm_policy_put_afinfo(afinfo);
2427 return err;
2428 }
2429 EXPORT_SYMBOL(__xfrm_decode_session);
2430
2431 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2432 {
2433 for (; k < sp->len; k++) {
2434 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2435 *idxp = k;
2436 return 1;
2437 }
2438 }
2439
2440 return 0;
2441 }
2442
2443 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2444 unsigned short family)
2445 {
2446 struct net *net = dev_net(skb->dev);
2447 struct xfrm_policy *pol;
2448 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2449 int npols = 0;
2450 int xfrm_nr;
2451 int pi;
2452 int reverse;
2453 struct flowi fl;
2454 u8 fl_dir;
2455 int xerr_idx = -1;
2456
2457 reverse = dir & ~XFRM_POLICY_MASK;
2458 dir &= XFRM_POLICY_MASK;
2459 fl_dir = policy_to_flow_dir(dir);
2460
2461 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2462 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2463 return 0;
2464 }
2465
2466 nf_nat_decode_session(skb, &fl, family);
2467
2468 /* First, check used SA against their selectors. */
2469 if (skb->sp) {
2470 int i;
2471
2472 for (i = skb->sp->len-1; i >= 0; i--) {
2473 struct xfrm_state *x = skb->sp->xvec[i];
2474 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2475 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2476 return 0;
2477 }
2478 }
2479 }
2480
2481 pol = NULL;
2482 if (sk && sk->sk_policy[dir]) {
2483 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2484 if (IS_ERR(pol)) {
2485 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2486 return 0;
2487 }
2488 }
2489
2490 if (!pol) {
2491 struct flow_cache_object *flo;
2492
2493 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2494 xfrm_policy_lookup, NULL);
2495 if (IS_ERR_OR_NULL(flo))
2496 pol = ERR_CAST(flo);
2497 else
2498 pol = container_of(flo, struct xfrm_policy, flo);
2499 }
2500
2501 if (IS_ERR(pol)) {
2502 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2503 return 0;
2504 }
2505
2506 if (!pol) {
2507 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2508 xfrm_secpath_reject(xerr_idx, skb, &fl);
2509 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2510 return 0;
2511 }
2512 return 1;
2513 }
2514
2515 pol->curlft.use_time = get_seconds();
2516
2517 pols[0] = pol;
2518 npols++;
2519 #ifdef CONFIG_XFRM_SUB_POLICY
2520 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2521 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2522 &fl, family,
2523 XFRM_POLICY_IN);
2524 if (pols[1]) {
2525 if (IS_ERR(pols[1])) {
2526 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2527 return 0;
2528 }
2529 pols[1]->curlft.use_time = get_seconds();
2530 npols++;
2531 }
2532 }
2533 #endif
2534
2535 if (pol->action == XFRM_POLICY_ALLOW) {
2536 struct sec_path *sp;
2537 static struct sec_path dummy;
2538 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2539 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2540 struct xfrm_tmpl **tpp = tp;
2541 int ti = 0;
2542 int i, k;
2543
2544 if ((sp = skb->sp) == NULL)
2545 sp = &dummy;
2546
2547 for (pi = 0; pi < npols; pi++) {
2548 if (pols[pi] != pol &&
2549 pols[pi]->action != XFRM_POLICY_ALLOW) {
2550 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2551 goto reject;
2552 }
2553 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2554 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2555 goto reject_error;
2556 }
2557 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2558 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2559 }
2560 xfrm_nr = ti;
2561 if (npols > 1) {
2562 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2563 tpp = stp;
2564 }
2565
2566 /* For each tunnel xfrm, find the first matching tmpl.
2567 * For each tmpl before that, find corresponding xfrm.
2568 * Order is _important_. Later we will implement
2569 * some barriers, but at the moment barriers
2570 * are implied between each two transformations.
2571 */
2572 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2573 k = xfrm_policy_ok(tpp[i], sp, k, family);
2574 if (k < 0) {
2575 if (k < -1)
2576 /* "-2 - errored_index" returned */
2577 xerr_idx = -(2+k);
2578 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2579 goto reject;
2580 }
2581 }
2582
2583 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2584 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2585 goto reject;
2586 }
2587
2588 xfrm_pols_put(pols, npols);
2589 return 1;
2590 }
2591 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2592
2593 reject:
2594 xfrm_secpath_reject(xerr_idx, skb, &fl);
2595 reject_error:
2596 xfrm_pols_put(pols, npols);
2597 return 0;
2598 }
2599 EXPORT_SYMBOL(__xfrm_policy_check);
2600
2601 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2602 {
2603 struct net *net = dev_net(skb->dev);
2604 struct flowi fl;
2605 struct dst_entry *dst;
2606 int res = 1;
2607
2608 if (xfrm_decode_session(skb, &fl, family) < 0) {
2609 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2610 return 0;
2611 }
2612
2613 skb_dst_force(skb);
2614
2615 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2616 if (IS_ERR(dst)) {
2617 res = 0;
2618 dst = NULL;
2619 }
2620 skb_dst_set(skb, dst);
2621 return res;
2622 }
2623 EXPORT_SYMBOL(__xfrm_route_forward);
2624
2625 /* Optimize later using cookies and generation ids. */
2626
2627 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2628 {
2629 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2630 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2631 * get validated by dst_ops->check on every use. We do this
2632 * because when a normal route referenced by an XFRM dst is
2633 * obsoleted we do not go looking around for all parent
2634 * referencing XFRM dsts so that we can invalidate them. It
2635 * is just too much work. Instead we make the checks here on
2636 * every use. For example:
2637 *
2638 * XFRM dst A --> IPv4 dst X
2639 *
2640 * X is the "xdst->route" of A (X is also the "dst->path" of A
2641 * in this example). If X is marked obsolete, "A" will not
2642 * notice. That's what we are validating here via the
2643 * stale_bundle() check.
2644 *
2645 * When a policy's bundle is pruned, we dst_free() the XFRM
2646 * dst which causes it's ->obsolete field to be set to
2647 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2648 * this, we want to force a new route lookup.
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 static void xfrm_garbage_collect_deferred(struct net *net)
2694 {
2695 flow_cache_flush_deferred(net);
2696 }
2697
2698 static void xfrm_init_pmtu(struct dst_entry *dst)
2699 {
2700 do {
2701 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2702 u32 pmtu, route_mtu_cached;
2703
2704 pmtu = dst_mtu(dst->child);
2705 xdst->child_mtu_cached = pmtu;
2706
2707 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2708
2709 route_mtu_cached = dst_mtu(xdst->route);
2710 xdst->route_mtu_cached = route_mtu_cached;
2711
2712 if (pmtu > route_mtu_cached)
2713 pmtu = route_mtu_cached;
2714
2715 dst_metric_set(dst, RTAX_MTU, pmtu);
2716 } while ((dst = dst->next));
2717 }
2718
2719 /* Check that the bundle accepts the flow and its components are
2720 * still valid.
2721 */
2722
2723 static int xfrm_bundle_ok(struct xfrm_dst *first)
2724 {
2725 struct dst_entry *dst = &first->u.dst;
2726 struct xfrm_dst *last;
2727 u32 mtu;
2728
2729 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2730 (dst->dev && !netif_running(dst->dev)))
2731 return 0;
2732
2733 if (dst->flags & DST_XFRM_QUEUE)
2734 return 1;
2735
2736 last = NULL;
2737
2738 do {
2739 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2740
2741 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2742 return 0;
2743 if (xdst->xfrm_genid != dst->xfrm->genid)
2744 return 0;
2745 if (xdst->num_pols > 0 &&
2746 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2747 return 0;
2748
2749 mtu = dst_mtu(dst->child);
2750 if (xdst->child_mtu_cached != mtu) {
2751 last = xdst;
2752 xdst->child_mtu_cached = mtu;
2753 }
2754
2755 if (!dst_check(xdst->route, xdst->route_cookie))
2756 return 0;
2757 mtu = dst_mtu(xdst->route);
2758 if (xdst->route_mtu_cached != mtu) {
2759 last = xdst;
2760 xdst->route_mtu_cached = mtu;
2761 }
2762
2763 dst = dst->child;
2764 } while (dst->xfrm);
2765
2766 if (likely(!last))
2767 return 1;
2768
2769 mtu = last->child_mtu_cached;
2770 for (;;) {
2771 dst = &last->u.dst;
2772
2773 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2774 if (mtu > last->route_mtu_cached)
2775 mtu = last->route_mtu_cached;
2776 dst_metric_set(dst, RTAX_MTU, mtu);
2777
2778 if (last == first)
2779 break;
2780
2781 last = (struct xfrm_dst *)last->u.dst.next;
2782 last->child_mtu_cached = mtu;
2783 }
2784
2785 return 1;
2786 }
2787
2788 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2789 {
2790 return dst_metric_advmss(dst->path);
2791 }
2792
2793 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2794 {
2795 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2796
2797 return mtu ? : dst_mtu(dst->path);
2798 }
2799
2800 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2801 struct sk_buff *skb,
2802 const void *daddr)
2803 {
2804 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2805 }
2806
2807 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2808 {
2809 struct net *net;
2810 int err = 0;
2811 if (unlikely(afinfo == NULL))
2812 return -EINVAL;
2813 if (unlikely(afinfo->family >= NPROTO))
2814 return -EAFNOSUPPORT;
2815 spin_lock(&xfrm_policy_afinfo_lock);
2816 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2817 err = -ENOBUFS;
2818 else {
2819 struct dst_ops *dst_ops = afinfo->dst_ops;
2820 if (likely(dst_ops->kmem_cachep == NULL))
2821 dst_ops->kmem_cachep = xfrm_dst_cache;
2822 if (likely(dst_ops->check == NULL))
2823 dst_ops->check = xfrm_dst_check;
2824 if (likely(dst_ops->default_advmss == NULL))
2825 dst_ops->default_advmss = xfrm_default_advmss;
2826 if (likely(dst_ops->mtu == NULL))
2827 dst_ops->mtu = xfrm_mtu;
2828 if (likely(dst_ops->negative_advice == NULL))
2829 dst_ops->negative_advice = xfrm_negative_advice;
2830 if (likely(dst_ops->link_failure == NULL))
2831 dst_ops->link_failure = xfrm_link_failure;
2832 if (likely(dst_ops->neigh_lookup == NULL))
2833 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2834 if (likely(afinfo->garbage_collect == NULL))
2835 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2836 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2837 }
2838 spin_unlock(&xfrm_policy_afinfo_lock);
2839
2840 rtnl_lock();
2841 for_each_net(net) {
2842 struct dst_ops *xfrm_dst_ops;
2843
2844 switch (afinfo->family) {
2845 case AF_INET:
2846 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2847 break;
2848 #if IS_ENABLED(CONFIG_IPV6)
2849 case AF_INET6:
2850 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2851 break;
2852 #endif
2853 default:
2854 BUG();
2855 }
2856 *xfrm_dst_ops = *afinfo->dst_ops;
2857 }
2858 rtnl_unlock();
2859
2860 return err;
2861 }
2862 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2863
2864 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2865 {
2866 int err = 0;
2867 if (unlikely(afinfo == NULL))
2868 return -EINVAL;
2869 if (unlikely(afinfo->family >= NPROTO))
2870 return -EAFNOSUPPORT;
2871 spin_lock(&xfrm_policy_afinfo_lock);
2872 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2873 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2874 err = -EINVAL;
2875 else
2876 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2877 NULL);
2878 }
2879 spin_unlock(&xfrm_policy_afinfo_lock);
2880 if (!err) {
2881 struct dst_ops *dst_ops = afinfo->dst_ops;
2882
2883 synchronize_rcu();
2884
2885 dst_ops->kmem_cachep = NULL;
2886 dst_ops->check = NULL;
2887 dst_ops->negative_advice = NULL;
2888 dst_ops->link_failure = NULL;
2889 afinfo->garbage_collect = NULL;
2890 }
2891 return err;
2892 }
2893 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2894
2895 static void __net_init xfrm_dst_ops_init(struct net *net)
2896 {
2897 struct xfrm_policy_afinfo *afinfo;
2898
2899 rcu_read_lock();
2900 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2901 if (afinfo)
2902 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2903 #if IS_ENABLED(CONFIG_IPV6)
2904 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2905 if (afinfo)
2906 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2907 #endif
2908 rcu_read_unlock();
2909 }
2910
2911 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2912 {
2913 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2914
2915 switch (event) {
2916 case NETDEV_DOWN:
2917 xfrm_garbage_collect(dev_net(dev));
2918 }
2919 return NOTIFY_DONE;
2920 }
2921
2922 static struct notifier_block xfrm_dev_notifier = {
2923 .notifier_call = xfrm_dev_event,
2924 };
2925
2926 #ifdef CONFIG_XFRM_STATISTICS
2927 static int __net_init xfrm_statistics_init(struct net *net)
2928 {
2929 int rv;
2930 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2931 if (!net->mib.xfrm_statistics)
2932 return -ENOMEM;
2933 rv = xfrm_proc_init(net);
2934 if (rv < 0)
2935 free_percpu(net->mib.xfrm_statistics);
2936 return rv;
2937 }
2938
2939 static void xfrm_statistics_fini(struct net *net)
2940 {
2941 xfrm_proc_fini(net);
2942 free_percpu(net->mib.xfrm_statistics);
2943 }
2944 #else
2945 static int __net_init xfrm_statistics_init(struct net *net)
2946 {
2947 return 0;
2948 }
2949
2950 static void xfrm_statistics_fini(struct net *net)
2951 {
2952 }
2953 #endif
2954
2955 static int __net_init xfrm_policy_init(struct net *net)
2956 {
2957 unsigned int hmask, sz;
2958 int dir;
2959
2960 if (net_eq(net, &init_net))
2961 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2962 sizeof(struct xfrm_dst),
2963 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2964 NULL);
2965
2966 hmask = 8 - 1;
2967 sz = (hmask+1) * sizeof(struct hlist_head);
2968
2969 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2970 if (!net->xfrm.policy_byidx)
2971 goto out_byidx;
2972 net->xfrm.policy_idx_hmask = hmask;
2973
2974 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2975 struct xfrm_policy_hash *htab;
2976
2977 net->xfrm.policy_count[dir] = 0;
2978 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
2979 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2980
2981 htab = &net->xfrm.policy_bydst[dir];
2982 htab->table = xfrm_hash_alloc(sz);
2983 if (!htab->table)
2984 goto out_bydst;
2985 htab->hmask = hmask;
2986 htab->dbits4 = 32;
2987 htab->sbits4 = 32;
2988 htab->dbits6 = 128;
2989 htab->sbits6 = 128;
2990 }
2991 net->xfrm.policy_hthresh.lbits4 = 32;
2992 net->xfrm.policy_hthresh.rbits4 = 32;
2993 net->xfrm.policy_hthresh.lbits6 = 128;
2994 net->xfrm.policy_hthresh.rbits6 = 128;
2995
2996 seqlock_init(&net->xfrm.policy_hthresh.lock);
2997
2998 INIT_LIST_HEAD(&net->xfrm.policy_all);
2999 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
3000 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
3001 if (net_eq(net, &init_net))
3002 register_netdevice_notifier(&xfrm_dev_notifier);
3003 return 0;
3004
3005 out_bydst:
3006 for (dir--; dir >= 0; dir--) {
3007 struct xfrm_policy_hash *htab;
3008
3009 htab = &net->xfrm.policy_bydst[dir];
3010 xfrm_hash_free(htab->table, sz);
3011 }
3012 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3013 out_byidx:
3014 return -ENOMEM;
3015 }
3016
3017 static void xfrm_policy_fini(struct net *net)
3018 {
3019 unsigned int sz;
3020 int dir;
3021
3022 flush_work(&net->xfrm.policy_hash_work);
3023 #ifdef CONFIG_XFRM_SUB_POLICY
3024 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
3025 #endif
3026 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
3027
3028 WARN_ON(!list_empty(&net->xfrm.policy_all));
3029
3030 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
3031 struct xfrm_policy_hash *htab;
3032
3033 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
3034
3035 htab = &net->xfrm.policy_bydst[dir];
3036 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
3037 WARN_ON(!hlist_empty(htab->table));
3038 xfrm_hash_free(htab->table, sz);
3039 }
3040
3041 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
3042 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3043 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3044 }
3045
3046 static int __net_init xfrm_net_init(struct net *net)
3047 {
3048 int rv;
3049
3050 rv = xfrm_statistics_init(net);
3051 if (rv < 0)
3052 goto out_statistics;
3053 rv = xfrm_state_init(net);
3054 if (rv < 0)
3055 goto out_state;
3056 rv = xfrm_policy_init(net);
3057 if (rv < 0)
3058 goto out_policy;
3059 xfrm_dst_ops_init(net);
3060 rv = xfrm_sysctl_init(net);
3061 if (rv < 0)
3062 goto out_sysctl;
3063 rv = flow_cache_init(net);
3064 if (rv < 0)
3065 goto out;
3066
3067 /* Initialize the per-net locks here */
3068 spin_lock_init(&net->xfrm.xfrm_state_lock);
3069 rwlock_init(&net->xfrm.xfrm_policy_lock);
3070 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3071
3072 return 0;
3073
3074 out:
3075 xfrm_sysctl_fini(net);
3076 out_sysctl:
3077 xfrm_policy_fini(net);
3078 out_policy:
3079 xfrm_state_fini(net);
3080 out_state:
3081 xfrm_statistics_fini(net);
3082 out_statistics:
3083 return rv;
3084 }
3085
3086 static void __net_exit xfrm_net_exit(struct net *net)
3087 {
3088 flow_cache_fini(net);
3089 xfrm_sysctl_fini(net);
3090 xfrm_policy_fini(net);
3091 xfrm_state_fini(net);
3092 xfrm_statistics_fini(net);
3093 }
3094
3095 static struct pernet_operations __net_initdata xfrm_net_ops = {
3096 .init = xfrm_net_init,
3097 .exit = xfrm_net_exit,
3098 };
3099
3100 void __init xfrm_init(void)
3101 {
3102 register_pernet_subsys(&xfrm_net_ops);
3103 xfrm_input_init();
3104 }
3105
3106 #ifdef CONFIG_AUDITSYSCALL
3107 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3108 struct audit_buffer *audit_buf)
3109 {
3110 struct xfrm_sec_ctx *ctx = xp->security;
3111 struct xfrm_selector *sel = &xp->selector;
3112
3113 if (ctx)
3114 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3115 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3116
3117 switch (sel->family) {
3118 case AF_INET:
3119 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
3120 if (sel->prefixlen_s != 32)
3121 audit_log_format(audit_buf, " src_prefixlen=%d",
3122 sel->prefixlen_s);
3123 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
3124 if (sel->prefixlen_d != 32)
3125 audit_log_format(audit_buf, " dst_prefixlen=%d",
3126 sel->prefixlen_d);
3127 break;
3128 case AF_INET6:
3129 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3130 if (sel->prefixlen_s != 128)
3131 audit_log_format(audit_buf, " src_prefixlen=%d",
3132 sel->prefixlen_s);
3133 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3134 if (sel->prefixlen_d != 128)
3135 audit_log_format(audit_buf, " dst_prefixlen=%d",
3136 sel->prefixlen_d);
3137 break;
3138 }
3139 }
3140
3141 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3142 {
3143 struct audit_buffer *audit_buf;
3144
3145 audit_buf = xfrm_audit_start("SPD-add");
3146 if (audit_buf == NULL)
3147 return;
3148 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3149 audit_log_format(audit_buf, " res=%u", result);
3150 xfrm_audit_common_policyinfo(xp, audit_buf);
3151 audit_log_end(audit_buf);
3152 }
3153 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3154
3155 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3156 bool task_valid)
3157 {
3158 struct audit_buffer *audit_buf;
3159
3160 audit_buf = xfrm_audit_start("SPD-delete");
3161 if (audit_buf == NULL)
3162 return;
3163 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3164 audit_log_format(audit_buf, " res=%u", result);
3165 xfrm_audit_common_policyinfo(xp, audit_buf);
3166 audit_log_end(audit_buf);
3167 }
3168 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3169 #endif
3170
3171 #ifdef CONFIG_XFRM_MIGRATE
3172 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3173 const struct xfrm_selector *sel_tgt)
3174 {
3175 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3176 if (sel_tgt->family == sel_cmp->family &&
3177 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3178 sel_cmp->family) &&
3179 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3180 sel_cmp->family) &&
3181 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3182 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3183 return true;
3184 }
3185 } else {
3186 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3187 return true;
3188 }
3189 }
3190 return false;
3191 }
3192
3193 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3194 u8 dir, u8 type, struct net *net)
3195 {
3196 struct xfrm_policy *pol, *ret = NULL;
3197 struct hlist_head *chain;
3198 u32 priority = ~0U;
3199
3200 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
3201 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3202 hlist_for_each_entry(pol, chain, bydst) {
3203 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3204 pol->type == type) {
3205 ret = pol;
3206 priority = ret->priority;
3207 break;
3208 }
3209 }
3210 chain = &net->xfrm.policy_inexact[dir];
3211 hlist_for_each_entry(pol, chain, bydst) {
3212 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3213 pol->type == type &&
3214 pol->priority < priority) {
3215 ret = pol;
3216 break;
3217 }
3218 }
3219
3220 if (ret)
3221 xfrm_pol_hold(ret);
3222
3223 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
3224
3225 return ret;
3226 }
3227
3228 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3229 {
3230 int match = 0;
3231
3232 if (t->mode == m->mode && t->id.proto == m->proto &&
3233 (m->reqid == 0 || t->reqid == m->reqid)) {
3234 switch (t->mode) {
3235 case XFRM_MODE_TUNNEL:
3236 case XFRM_MODE_BEET:
3237 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3238 m->old_family) &&
3239 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3240 m->old_family)) {
3241 match = 1;
3242 }
3243 break;
3244 case XFRM_MODE_TRANSPORT:
3245 /* in case of transport mode, template does not store
3246 any IP addresses, hence we just compare mode and
3247 protocol */
3248 match = 1;
3249 break;
3250 default:
3251 break;
3252 }
3253 }
3254 return match;
3255 }
3256
3257 /* update endpoint address(es) of template(s) */
3258 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3259 struct xfrm_migrate *m, int num_migrate)
3260 {
3261 struct xfrm_migrate *mp;
3262 int i, j, n = 0;
3263
3264 write_lock_bh(&pol->lock);
3265 if (unlikely(pol->walk.dead)) {
3266 /* target policy has been deleted */
3267 write_unlock_bh(&pol->lock);
3268 return -ENOENT;
3269 }
3270
3271 for (i = 0; i < pol->xfrm_nr; i++) {
3272 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3273 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3274 continue;
3275 n++;
3276 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3277 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3278 continue;
3279 /* update endpoints */
3280 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3281 sizeof(pol->xfrm_vec[i].id.daddr));
3282 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3283 sizeof(pol->xfrm_vec[i].saddr));
3284 pol->xfrm_vec[i].encap_family = mp->new_family;
3285 /* flush bundles */
3286 atomic_inc(&pol->genid);
3287 }
3288 }
3289
3290 write_unlock_bh(&pol->lock);
3291
3292 if (!n)
3293 return -ENODATA;
3294
3295 return 0;
3296 }
3297
3298 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3299 {
3300 int i, j;
3301
3302 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3303 return -EINVAL;
3304
3305 for (i = 0; i < num_migrate; i++) {
3306 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3307 m[i].old_family) &&
3308 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3309 m[i].old_family))
3310 return -EINVAL;
3311 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3312 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3313 return -EINVAL;
3314
3315 /* check if there is any duplicated entry */
3316 for (j = i + 1; j < num_migrate; j++) {
3317 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3318 sizeof(m[i].old_daddr)) &&
3319 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3320 sizeof(m[i].old_saddr)) &&
3321 m[i].proto == m[j].proto &&
3322 m[i].mode == m[j].mode &&
3323 m[i].reqid == m[j].reqid &&
3324 m[i].old_family == m[j].old_family)
3325 return -EINVAL;
3326 }
3327 }
3328
3329 return 0;
3330 }
3331
3332 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3333 struct xfrm_migrate *m, int num_migrate,
3334 struct xfrm_kmaddress *k, struct net *net)
3335 {
3336 int i, err, nx_cur = 0, nx_new = 0;
3337 struct xfrm_policy *pol = NULL;
3338 struct xfrm_state *x, *xc;
3339 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3340 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3341 struct xfrm_migrate *mp;
3342
3343 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3344 goto out;
3345
3346 /* Stage 1 - find policy */
3347 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3348 err = -ENOENT;
3349 goto out;
3350 }
3351
3352 /* Stage 2 - find and update state(s) */
3353 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3354 if ((x = xfrm_migrate_state_find(mp, net))) {
3355 x_cur[nx_cur] = x;
3356 nx_cur++;
3357 if ((xc = xfrm_state_migrate(x, mp))) {
3358 x_new[nx_new] = xc;
3359 nx_new++;
3360 } else {
3361 err = -ENODATA;
3362 goto restore_state;
3363 }
3364 }
3365 }
3366
3367 /* Stage 3 - update policy */
3368 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3369 goto restore_state;
3370
3371 /* Stage 4 - delete old state(s) */
3372 if (nx_cur) {
3373 xfrm_states_put(x_cur, nx_cur);
3374 xfrm_states_delete(x_cur, nx_cur);
3375 }
3376
3377 /* Stage 5 - announce */
3378 km_migrate(sel, dir, type, m, num_migrate, k);
3379
3380 xfrm_pol_put(pol);
3381
3382 return 0;
3383 out:
3384 return err;
3385
3386 restore_state:
3387 if (pol)
3388 xfrm_pol_put(pol);
3389 if (nx_cur)
3390 xfrm_states_put(x_cur, nx_cur);
3391 if (nx_new)
3392 xfrm_states_delete(x_new, nx_new);
3393
3394 return err;
3395 }
3396 EXPORT_SYMBOL(xfrm_migrate);
3397 #endif
Linux kernel - Deliverables
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