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Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
[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 /* Rule must be locked. Release descentant resources, announce
319 * entry dead. The rule must be unlinked from lists to the moment.
320 */
321
322 static void xfrm_policy_kill(struct xfrm_policy *policy)
323 {
324 policy->walk.dead = 1;
325
326 atomic_inc(&policy->genid);
327
328 if (del_timer(&policy->polq.hold_timer))
329 xfrm_pol_put(policy);
330 skb_queue_purge(&policy->polq.hold_queue);
331
332 if (del_timer(&policy->timer))
333 xfrm_pol_put(policy);
334
335 xfrm_pol_put(policy);
336 }
337
338 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
339
340 static inline unsigned int idx_hash(struct net *net, u32 index)
341 {
342 return __idx_hash(index, net->xfrm.policy_idx_hmask);
343 }
344
345 /* calculate policy hash thresholds */
346 static void __get_hash_thresh(struct net *net,
347 unsigned short family, int dir,
348 u8 *dbits, u8 *sbits)
349 {
350 switch (family) {
351 case AF_INET:
352 *dbits = net->xfrm.policy_bydst[dir].dbits4;
353 *sbits = net->xfrm.policy_bydst[dir].sbits4;
354 break;
355
356 case AF_INET6:
357 *dbits = net->xfrm.policy_bydst[dir].dbits6;
358 *sbits = net->xfrm.policy_bydst[dir].sbits6;
359 break;
360
361 default:
362 *dbits = 0;
363 *sbits = 0;
364 }
365 }
366
367 static struct hlist_head *policy_hash_bysel(struct net *net,
368 const struct xfrm_selector *sel,
369 unsigned short family, int dir)
370 {
371 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
372 unsigned int hash;
373 u8 dbits;
374 u8 sbits;
375
376 __get_hash_thresh(net, family, dir, &dbits, &sbits);
377 hash = __sel_hash(sel, family, hmask, dbits, sbits);
378
379 return (hash == hmask + 1 ?
380 &net->xfrm.policy_inexact[dir] :
381 net->xfrm.policy_bydst[dir].table + hash);
382 }
383
384 static struct hlist_head *policy_hash_direct(struct net *net,
385 const xfrm_address_t *daddr,
386 const xfrm_address_t *saddr,
387 unsigned short family, int dir)
388 {
389 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
390 unsigned int hash;
391 u8 dbits;
392 u8 sbits;
393
394 __get_hash_thresh(net, family, dir, &dbits, &sbits);
395 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
396
397 return net->xfrm.policy_bydst[dir].table + hash;
398 }
399
400 static void xfrm_dst_hash_transfer(struct net *net,
401 struct hlist_head *list,
402 struct hlist_head *ndsttable,
403 unsigned int nhashmask,
404 int dir)
405 {
406 struct hlist_node *tmp, *entry0 = NULL;
407 struct xfrm_policy *pol;
408 unsigned int h0 = 0;
409 u8 dbits;
410 u8 sbits;
411
412 redo:
413 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
414 unsigned int h;
415
416 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
417 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
418 pol->family, nhashmask, dbits, sbits);
419 if (!entry0) {
420 hlist_del(&pol->bydst);
421 hlist_add_head(&pol->bydst, ndsttable+h);
422 h0 = h;
423 } else {
424 if (h != h0)
425 continue;
426 hlist_del(&pol->bydst);
427 hlist_add_behind(&pol->bydst, entry0);
428 }
429 entry0 = &pol->bydst;
430 }
431 if (!hlist_empty(list)) {
432 entry0 = NULL;
433 goto redo;
434 }
435 }
436
437 static void xfrm_idx_hash_transfer(struct hlist_head *list,
438 struct hlist_head *nidxtable,
439 unsigned int nhashmask)
440 {
441 struct hlist_node *tmp;
442 struct xfrm_policy *pol;
443
444 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
445 unsigned int h;
446
447 h = __idx_hash(pol->index, nhashmask);
448 hlist_add_head(&pol->byidx, nidxtable+h);
449 }
450 }
451
452 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
453 {
454 return ((old_hmask + 1) << 1) - 1;
455 }
456
457 static void xfrm_bydst_resize(struct net *net, int dir)
458 {
459 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
460 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
461 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
462 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
463 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
464 int i;
465
466 if (!ndst)
467 return;
468
469 write_lock_bh(&net->xfrm.xfrm_policy_lock);
470
471 for (i = hmask; i >= 0; i--)
472 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
473
474 net->xfrm.policy_bydst[dir].table = ndst;
475 net->xfrm.policy_bydst[dir].hmask = nhashmask;
476
477 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
478
479 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
480 }
481
482 static void xfrm_byidx_resize(struct net *net, int total)
483 {
484 unsigned int hmask = net->xfrm.policy_idx_hmask;
485 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
486 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
487 struct hlist_head *oidx = net->xfrm.policy_byidx;
488 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
489 int i;
490
491 if (!nidx)
492 return;
493
494 write_lock_bh(&net->xfrm.xfrm_policy_lock);
495
496 for (i = hmask; i >= 0; i--)
497 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
498
499 net->xfrm.policy_byidx = nidx;
500 net->xfrm.policy_idx_hmask = nhashmask;
501
502 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
503
504 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
505 }
506
507 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
508 {
509 unsigned int cnt = net->xfrm.policy_count[dir];
510 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
511
512 if (total)
513 *total += cnt;
514
515 if ((hmask + 1) < xfrm_policy_hashmax &&
516 cnt > hmask)
517 return 1;
518
519 return 0;
520 }
521
522 static inline int xfrm_byidx_should_resize(struct net *net, int total)
523 {
524 unsigned int hmask = net->xfrm.policy_idx_hmask;
525
526 if ((hmask + 1) < xfrm_policy_hashmax &&
527 total > hmask)
528 return 1;
529
530 return 0;
531 }
532
533 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
534 {
535 read_lock_bh(&net->xfrm.xfrm_policy_lock);
536 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
537 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
538 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
539 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
540 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
541 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
542 si->spdhcnt = net->xfrm.policy_idx_hmask;
543 si->spdhmcnt = xfrm_policy_hashmax;
544 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
545 }
546 EXPORT_SYMBOL(xfrm_spd_getinfo);
547
548 static DEFINE_MUTEX(hash_resize_mutex);
549 static void xfrm_hash_resize(struct work_struct *work)
550 {
551 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
552 int dir, total;
553
554 mutex_lock(&hash_resize_mutex);
555
556 total = 0;
557 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
558 if (xfrm_bydst_should_resize(net, dir, &total))
559 xfrm_bydst_resize(net, dir);
560 }
561 if (xfrm_byidx_should_resize(net, total))
562 xfrm_byidx_resize(net, total);
563
564 mutex_unlock(&hash_resize_mutex);
565 }
566
567 static void xfrm_hash_rebuild(struct work_struct *work)
568 {
569 struct net *net = container_of(work, struct net,
570 xfrm.policy_hthresh.work);
571 unsigned int hmask;
572 struct xfrm_policy *pol;
573 struct xfrm_policy *policy;
574 struct hlist_head *chain;
575 struct hlist_head *odst;
576 struct hlist_node *newpos;
577 int i;
578 int dir;
579 unsigned seq;
580 u8 lbits4, rbits4, lbits6, rbits6;
581
582 mutex_lock(&hash_resize_mutex);
583
584 /* read selector prefixlen thresholds */
585 do {
586 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
587
588 lbits4 = net->xfrm.policy_hthresh.lbits4;
589 rbits4 = net->xfrm.policy_hthresh.rbits4;
590 lbits6 = net->xfrm.policy_hthresh.lbits6;
591 rbits6 = net->xfrm.policy_hthresh.rbits6;
592 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
593
594 write_lock_bh(&net->xfrm.xfrm_policy_lock);
595
596 /* reset the bydst and inexact table in all directions */
597 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
598 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
599 hmask = net->xfrm.policy_bydst[dir].hmask;
600 odst = net->xfrm.policy_bydst[dir].table;
601 for (i = hmask; i >= 0; i--)
602 INIT_HLIST_HEAD(odst + i);
603 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
604 /* dir out => dst = remote, src = local */
605 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
606 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
607 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
608 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
609 } else {
610 /* dir in/fwd => dst = local, src = remote */
611 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
612 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
613 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
614 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
615 }
616 }
617
618 /* re-insert all policies by order of creation */
619 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
620 newpos = NULL;
621 chain = policy_hash_bysel(net, &policy->selector,
622 policy->family,
623 xfrm_policy_id2dir(policy->index));
624 hlist_for_each_entry(pol, chain, bydst) {
625 if (policy->priority >= pol->priority)
626 newpos = &pol->bydst;
627 else
628 break;
629 }
630 if (newpos)
631 hlist_add_behind(&policy->bydst, newpos);
632 else
633 hlist_add_head(&policy->bydst, chain);
634 }
635
636 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
637
638 mutex_unlock(&hash_resize_mutex);
639 }
640
641 void xfrm_policy_hash_rebuild(struct net *net)
642 {
643 schedule_work(&net->xfrm.policy_hthresh.work);
644 }
645 EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
646
647 /* Generate new index... KAME seems to generate them ordered by cost
648 * of an absolute inpredictability of ordering of rules. This will not pass. */
649 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
650 {
651 static u32 idx_generator;
652
653 for (;;) {
654 struct hlist_head *list;
655 struct xfrm_policy *p;
656 u32 idx;
657 int found;
658
659 if (!index) {
660 idx = (idx_generator | dir);
661 idx_generator += 8;
662 } else {
663 idx = index;
664 index = 0;
665 }
666
667 if (idx == 0)
668 idx = 8;
669 list = net->xfrm.policy_byidx + idx_hash(net, idx);
670 found = 0;
671 hlist_for_each_entry(p, list, byidx) {
672 if (p->index == idx) {
673 found = 1;
674 break;
675 }
676 }
677 if (!found)
678 return idx;
679 }
680 }
681
682 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
683 {
684 u32 *p1 = (u32 *) s1;
685 u32 *p2 = (u32 *) s2;
686 int len = sizeof(struct xfrm_selector) / sizeof(u32);
687 int i;
688
689 for (i = 0; i < len; i++) {
690 if (p1[i] != p2[i])
691 return 1;
692 }
693
694 return 0;
695 }
696
697 static void xfrm_policy_requeue(struct xfrm_policy *old,
698 struct xfrm_policy *new)
699 {
700 struct xfrm_policy_queue *pq = &old->polq;
701 struct sk_buff_head list;
702
703 if (skb_queue_empty(&pq->hold_queue))
704 return;
705
706 __skb_queue_head_init(&list);
707
708 spin_lock_bh(&pq->hold_queue.lock);
709 skb_queue_splice_init(&pq->hold_queue, &list);
710 if (del_timer(&pq->hold_timer))
711 xfrm_pol_put(old);
712 spin_unlock_bh(&pq->hold_queue.lock);
713
714 pq = &new->polq;
715
716 spin_lock_bh(&pq->hold_queue.lock);
717 skb_queue_splice(&list, &pq->hold_queue);
718 pq->timeout = XFRM_QUEUE_TMO_MIN;
719 if (!mod_timer(&pq->hold_timer, jiffies))
720 xfrm_pol_hold(new);
721 spin_unlock_bh(&pq->hold_queue.lock);
722 }
723
724 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
725 struct xfrm_policy *pol)
726 {
727 u32 mark = policy->mark.v & policy->mark.m;
728
729 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
730 return true;
731
732 if ((mark & pol->mark.m) == pol->mark.v &&
733 policy->priority == pol->priority)
734 return true;
735
736 return false;
737 }
738
739 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
740 {
741 struct net *net = xp_net(policy);
742 struct xfrm_policy *pol;
743 struct xfrm_policy *delpol;
744 struct hlist_head *chain;
745 struct hlist_node *newpos;
746
747 write_lock_bh(&net->xfrm.xfrm_policy_lock);
748 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
749 delpol = NULL;
750 newpos = NULL;
751 hlist_for_each_entry(pol, chain, bydst) {
752 if (pol->type == policy->type &&
753 !selector_cmp(&pol->selector, &policy->selector) &&
754 xfrm_policy_mark_match(policy, pol) &&
755 xfrm_sec_ctx_match(pol->security, policy->security) &&
756 !WARN_ON(delpol)) {
757 if (excl) {
758 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
759 return -EEXIST;
760 }
761 delpol = pol;
762 if (policy->priority > pol->priority)
763 continue;
764 } else if (policy->priority >= pol->priority) {
765 newpos = &pol->bydst;
766 continue;
767 }
768 if (delpol)
769 break;
770 }
771 if (newpos)
772 hlist_add_behind(&policy->bydst, newpos);
773 else
774 hlist_add_head(&policy->bydst, chain);
775 __xfrm_policy_link(policy, dir);
776 atomic_inc(&net->xfrm.flow_cache_genid);
777
778 /* After previous checking, family can either be AF_INET or AF_INET6 */
779 if (policy->family == AF_INET)
780 rt_genid_bump_ipv4(net);
781 else
782 rt_genid_bump_ipv6(net);
783
784 if (delpol) {
785 xfrm_policy_requeue(delpol, policy);
786 __xfrm_policy_unlink(delpol, dir);
787 }
788 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
789 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
790 policy->curlft.add_time = get_seconds();
791 policy->curlft.use_time = 0;
792 if (!mod_timer(&policy->timer, jiffies + HZ))
793 xfrm_pol_hold(policy);
794 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
795
796 if (delpol)
797 xfrm_policy_kill(delpol);
798 else if (xfrm_bydst_should_resize(net, dir, NULL))
799 schedule_work(&net->xfrm.policy_hash_work);
800
801 return 0;
802 }
803 EXPORT_SYMBOL(xfrm_policy_insert);
804
805 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
806 int dir, struct xfrm_selector *sel,
807 struct xfrm_sec_ctx *ctx, int delete,
808 int *err)
809 {
810 struct xfrm_policy *pol, *ret;
811 struct hlist_head *chain;
812
813 *err = 0;
814 write_lock_bh(&net->xfrm.xfrm_policy_lock);
815 chain = policy_hash_bysel(net, sel, sel->family, dir);
816 ret = NULL;
817 hlist_for_each_entry(pol, chain, bydst) {
818 if (pol->type == type &&
819 (mark & pol->mark.m) == pol->mark.v &&
820 !selector_cmp(sel, &pol->selector) &&
821 xfrm_sec_ctx_match(ctx, pol->security)) {
822 xfrm_pol_hold(pol);
823 if (delete) {
824 *err = security_xfrm_policy_delete(
825 pol->security);
826 if (*err) {
827 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
828 return pol;
829 }
830 __xfrm_policy_unlink(pol, dir);
831 }
832 ret = pol;
833 break;
834 }
835 }
836 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
837
838 if (ret && delete)
839 xfrm_policy_kill(ret);
840 return ret;
841 }
842 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
843
844 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
845 int dir, u32 id, int delete, int *err)
846 {
847 struct xfrm_policy *pol, *ret;
848 struct hlist_head *chain;
849
850 *err = -ENOENT;
851 if (xfrm_policy_id2dir(id) != dir)
852 return NULL;
853
854 *err = 0;
855 write_lock_bh(&net->xfrm.xfrm_policy_lock);
856 chain = net->xfrm.policy_byidx + idx_hash(net, id);
857 ret = NULL;
858 hlist_for_each_entry(pol, chain, byidx) {
859 if (pol->type == type && pol->index == id &&
860 (mark & pol->mark.m) == pol->mark.v) {
861 xfrm_pol_hold(pol);
862 if (delete) {
863 *err = security_xfrm_policy_delete(
864 pol->security);
865 if (*err) {
866 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
867 return pol;
868 }
869 __xfrm_policy_unlink(pol, dir);
870 }
871 ret = pol;
872 break;
873 }
874 }
875 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
876
877 if (ret && delete)
878 xfrm_policy_kill(ret);
879 return ret;
880 }
881 EXPORT_SYMBOL(xfrm_policy_byid);
882
883 #ifdef CONFIG_SECURITY_NETWORK_XFRM
884 static inline int
885 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
886 {
887 int dir, err = 0;
888
889 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
890 struct xfrm_policy *pol;
891 int i;
892
893 hlist_for_each_entry(pol,
894 &net->xfrm.policy_inexact[dir], bydst) {
895 if (pol->type != type)
896 continue;
897 err = security_xfrm_policy_delete(pol->security);
898 if (err) {
899 xfrm_audit_policy_delete(pol, 0, task_valid);
900 return err;
901 }
902 }
903 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
904 hlist_for_each_entry(pol,
905 net->xfrm.policy_bydst[dir].table + i,
906 bydst) {
907 if (pol->type != type)
908 continue;
909 err = security_xfrm_policy_delete(
910 pol->security);
911 if (err) {
912 xfrm_audit_policy_delete(pol, 0,
913 task_valid);
914 return err;
915 }
916 }
917 }
918 }
919 return err;
920 }
921 #else
922 static inline int
923 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
924 {
925 return 0;
926 }
927 #endif
928
929 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
930 {
931 int dir, err = 0, cnt = 0;
932
933 write_lock_bh(&net->xfrm.xfrm_policy_lock);
934
935 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
936 if (err)
937 goto out;
938
939 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
940 struct xfrm_policy *pol;
941 int i;
942
943 again1:
944 hlist_for_each_entry(pol,
945 &net->xfrm.policy_inexact[dir], bydst) {
946 if (pol->type != type)
947 continue;
948 __xfrm_policy_unlink(pol, dir);
949 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
950 cnt++;
951
952 xfrm_audit_policy_delete(pol, 1, task_valid);
953
954 xfrm_policy_kill(pol);
955
956 write_lock_bh(&net->xfrm.xfrm_policy_lock);
957 goto again1;
958 }
959
960 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
961 again2:
962 hlist_for_each_entry(pol,
963 net->xfrm.policy_bydst[dir].table + i,
964 bydst) {
965 if (pol->type != type)
966 continue;
967 __xfrm_policy_unlink(pol, dir);
968 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
969 cnt++;
970
971 xfrm_audit_policy_delete(pol, 1, task_valid);
972 xfrm_policy_kill(pol);
973
974 write_lock_bh(&net->xfrm.xfrm_policy_lock);
975 goto again2;
976 }
977 }
978
979 }
980 if (!cnt)
981 err = -ESRCH;
982 out:
983 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
984 return err;
985 }
986 EXPORT_SYMBOL(xfrm_policy_flush);
987
988 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
989 int (*func)(struct xfrm_policy *, int, int, void*),
990 void *data)
991 {
992 struct xfrm_policy *pol;
993 struct xfrm_policy_walk_entry *x;
994 int error = 0;
995
996 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
997 walk->type != XFRM_POLICY_TYPE_ANY)
998 return -EINVAL;
999
1000 if (list_empty(&walk->walk.all) && walk->seq != 0)
1001 return 0;
1002
1003 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1004 if (list_empty(&walk->walk.all))
1005 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
1006 else
1007 x = list_first_entry(&walk->walk.all,
1008 struct xfrm_policy_walk_entry, all);
1009
1010 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
1011 if (x->dead)
1012 continue;
1013 pol = container_of(x, struct xfrm_policy, walk);
1014 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1015 walk->type != pol->type)
1016 continue;
1017 error = func(pol, xfrm_policy_id2dir(pol->index),
1018 walk->seq, data);
1019 if (error) {
1020 list_move_tail(&walk->walk.all, &x->all);
1021 goto out;
1022 }
1023 walk->seq++;
1024 }
1025 if (walk->seq == 0) {
1026 error = -ENOENT;
1027 goto out;
1028 }
1029 list_del_init(&walk->walk.all);
1030 out:
1031 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1032 return error;
1033 }
1034 EXPORT_SYMBOL(xfrm_policy_walk);
1035
1036 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1037 {
1038 INIT_LIST_HEAD(&walk->walk.all);
1039 walk->walk.dead = 1;
1040 walk->type = type;
1041 walk->seq = 0;
1042 }
1043 EXPORT_SYMBOL(xfrm_policy_walk_init);
1044
1045 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
1046 {
1047 if (list_empty(&walk->walk.all))
1048 return;
1049
1050 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
1051 list_del(&walk->walk.all);
1052 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1053 }
1054 EXPORT_SYMBOL(xfrm_policy_walk_done);
1055
1056 /*
1057 * Find policy to apply to this flow.
1058 *
1059 * Returns 0 if policy found, else an -errno.
1060 */
1061 static int xfrm_policy_match(const struct xfrm_policy *pol,
1062 const struct flowi *fl,
1063 u8 type, u16 family, int dir)
1064 {
1065 const struct xfrm_selector *sel = &pol->selector;
1066 int ret = -ESRCH;
1067 bool match;
1068
1069 if (pol->family != family ||
1070 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
1071 pol->type != type)
1072 return ret;
1073
1074 match = xfrm_selector_match(sel, fl, family);
1075 if (match)
1076 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
1077 dir);
1078
1079 return ret;
1080 }
1081
1082 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
1083 const struct flowi *fl,
1084 u16 family, u8 dir)
1085 {
1086 int err;
1087 struct xfrm_policy *pol, *ret;
1088 const xfrm_address_t *daddr, *saddr;
1089 struct hlist_head *chain;
1090 u32 priority = ~0U;
1091
1092 daddr = xfrm_flowi_daddr(fl, family);
1093 saddr = xfrm_flowi_saddr(fl, family);
1094 if (unlikely(!daddr || !saddr))
1095 return NULL;
1096
1097 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1098 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1099 ret = NULL;
1100 hlist_for_each_entry(pol, chain, bydst) {
1101 err = xfrm_policy_match(pol, fl, type, family, dir);
1102 if (err) {
1103 if (err == -ESRCH)
1104 continue;
1105 else {
1106 ret = ERR_PTR(err);
1107 goto fail;
1108 }
1109 } else {
1110 ret = pol;
1111 priority = ret->priority;
1112 break;
1113 }
1114 }
1115 chain = &net->xfrm.policy_inexact[dir];
1116 hlist_for_each_entry(pol, chain, bydst) {
1117 if ((pol->priority >= priority) && ret)
1118 break;
1119
1120 err = xfrm_policy_match(pol, fl, type, family, dir);
1121 if (err) {
1122 if (err == -ESRCH)
1123 continue;
1124 else {
1125 ret = ERR_PTR(err);
1126 goto fail;
1127 }
1128 } else {
1129 ret = pol;
1130 break;
1131 }
1132 }
1133
1134 xfrm_pol_hold(ret);
1135 fail:
1136 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1137
1138 return ret;
1139 }
1140
1141 static struct xfrm_policy *
1142 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1143 {
1144 #ifdef CONFIG_XFRM_SUB_POLICY
1145 struct xfrm_policy *pol;
1146
1147 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1148 if (pol != NULL)
1149 return pol;
1150 #endif
1151 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1152 }
1153
1154 static int flow_to_policy_dir(int dir)
1155 {
1156 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1157 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1158 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1159 return dir;
1160
1161 switch (dir) {
1162 default:
1163 case FLOW_DIR_IN:
1164 return XFRM_POLICY_IN;
1165 case FLOW_DIR_OUT:
1166 return XFRM_POLICY_OUT;
1167 case FLOW_DIR_FWD:
1168 return XFRM_POLICY_FWD;
1169 }
1170 }
1171
1172 static struct flow_cache_object *
1173 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1174 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1175 {
1176 struct xfrm_policy *pol;
1177
1178 if (old_obj)
1179 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1180
1181 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1182 if (IS_ERR_OR_NULL(pol))
1183 return ERR_CAST(pol);
1184
1185 /* Resolver returns two references:
1186 * one for cache and one for caller of flow_cache_lookup() */
1187 xfrm_pol_hold(pol);
1188
1189 return &pol->flo;
1190 }
1191
1192 static inline int policy_to_flow_dir(int dir)
1193 {
1194 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1195 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1196 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1197 return dir;
1198 switch (dir) {
1199 default:
1200 case XFRM_POLICY_IN:
1201 return FLOW_DIR_IN;
1202 case XFRM_POLICY_OUT:
1203 return FLOW_DIR_OUT;
1204 case XFRM_POLICY_FWD:
1205 return FLOW_DIR_FWD;
1206 }
1207 }
1208
1209 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1210 const struct flowi *fl)
1211 {
1212 struct xfrm_policy *pol;
1213 struct net *net = sock_net(sk);
1214
1215 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1216 if ((pol = sk->sk_policy[dir]) != NULL) {
1217 bool match = xfrm_selector_match(&pol->selector, fl,
1218 sk->sk_family);
1219 int err = 0;
1220
1221 if (match) {
1222 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1223 pol = NULL;
1224 goto out;
1225 }
1226 err = security_xfrm_policy_lookup(pol->security,
1227 fl->flowi_secid,
1228 policy_to_flow_dir(dir));
1229 if (!err)
1230 xfrm_pol_hold(pol);
1231 else if (err == -ESRCH)
1232 pol = NULL;
1233 else
1234 pol = ERR_PTR(err);
1235 } else
1236 pol = NULL;
1237 }
1238 out:
1239 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1240 return pol;
1241 }
1242
1243 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1244 {
1245 struct net *net = xp_net(pol);
1246
1247 list_add(&pol->walk.all, &net->xfrm.policy_all);
1248 net->xfrm.policy_count[dir]++;
1249 xfrm_pol_hold(pol);
1250 }
1251
1252 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1253 int dir)
1254 {
1255 struct net *net = xp_net(pol);
1256
1257 if (list_empty(&pol->walk.all))
1258 return NULL;
1259
1260 /* Socket policies are not hashed. */
1261 if (!hlist_unhashed(&pol->bydst)) {
1262 hlist_del(&pol->bydst);
1263 hlist_del(&pol->byidx);
1264 }
1265
1266 list_del_init(&pol->walk.all);
1267 net->xfrm.policy_count[dir]--;
1268
1269 return pol;
1270 }
1271
1272 static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1273 {
1274 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1275 }
1276
1277 static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1278 {
1279 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1280 }
1281
1282 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1283 {
1284 struct net *net = xp_net(pol);
1285
1286 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1287 pol = __xfrm_policy_unlink(pol, dir);
1288 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1289 if (pol) {
1290 xfrm_policy_kill(pol);
1291 return 0;
1292 }
1293 return -ENOENT;
1294 }
1295 EXPORT_SYMBOL(xfrm_policy_delete);
1296
1297 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1298 {
1299 struct net *net = xp_net(pol);
1300 struct xfrm_policy *old_pol;
1301
1302 #ifdef CONFIG_XFRM_SUB_POLICY
1303 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1304 return -EINVAL;
1305 #endif
1306
1307 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1308 old_pol = sk->sk_policy[dir];
1309 sk->sk_policy[dir] = pol;
1310 if (pol) {
1311 pol->curlft.add_time = get_seconds();
1312 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1313 xfrm_sk_policy_link(pol, dir);
1314 }
1315 if (old_pol) {
1316 if (pol)
1317 xfrm_policy_requeue(old_pol, pol);
1318
1319 /* Unlinking succeeds always. This is the only function
1320 * allowed to delete or replace socket policy.
1321 */
1322 xfrm_sk_policy_unlink(old_pol, dir);
1323 }
1324 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1325
1326 if (old_pol) {
1327 xfrm_policy_kill(old_pol);
1328 }
1329 return 0;
1330 }
1331
1332 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1333 {
1334 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1335 struct net *net = xp_net(old);
1336
1337 if (newp) {
1338 newp->selector = old->selector;
1339 if (security_xfrm_policy_clone(old->security,
1340 &newp->security)) {
1341 kfree(newp);
1342 return NULL; /* ENOMEM */
1343 }
1344 newp->lft = old->lft;
1345 newp->curlft = old->curlft;
1346 newp->mark = old->mark;
1347 newp->action = old->action;
1348 newp->flags = old->flags;
1349 newp->xfrm_nr = old->xfrm_nr;
1350 newp->index = old->index;
1351 newp->type = old->type;
1352 memcpy(newp->xfrm_vec, old->xfrm_vec,
1353 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1354 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1355 xfrm_sk_policy_link(newp, dir);
1356 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1357 xfrm_pol_put(newp);
1358 }
1359 return newp;
1360 }
1361
1362 int __xfrm_sk_clone_policy(struct sock *sk)
1363 {
1364 struct xfrm_policy *p0 = sk->sk_policy[0],
1365 *p1 = sk->sk_policy[1];
1366
1367 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1368 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1369 return -ENOMEM;
1370 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1371 return -ENOMEM;
1372 return 0;
1373 }
1374
1375 static int
1376 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1377 unsigned short family)
1378 {
1379 int err;
1380 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1381
1382 if (unlikely(afinfo == NULL))
1383 return -EINVAL;
1384 err = afinfo->get_saddr(net, local, remote);
1385 xfrm_policy_put_afinfo(afinfo);
1386 return err;
1387 }
1388
1389 /* Resolve list of templates for the flow, given policy. */
1390
1391 static int
1392 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1393 struct xfrm_state **xfrm, unsigned short family)
1394 {
1395 struct net *net = xp_net(policy);
1396 int nx;
1397 int i, error;
1398 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1399 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1400 xfrm_address_t tmp;
1401
1402 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1403 struct xfrm_state *x;
1404 xfrm_address_t *remote = daddr;
1405 xfrm_address_t *local = saddr;
1406 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1407
1408 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1409 tmpl->mode == XFRM_MODE_BEET) {
1410 remote = &tmpl->id.daddr;
1411 local = &tmpl->saddr;
1412 if (xfrm_addr_any(local, tmpl->encap_family)) {
1413 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1414 if (error)
1415 goto fail;
1416 local = &tmp;
1417 }
1418 }
1419
1420 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1421
1422 if (x && x->km.state == XFRM_STATE_VALID) {
1423 xfrm[nx++] = x;
1424 daddr = remote;
1425 saddr = local;
1426 continue;
1427 }
1428 if (x) {
1429 error = (x->km.state == XFRM_STATE_ERROR ?
1430 -EINVAL : -EAGAIN);
1431 xfrm_state_put(x);
1432 } else if (error == -ESRCH) {
1433 error = -EAGAIN;
1434 }
1435
1436 if (!tmpl->optional)
1437 goto fail;
1438 }
1439 return nx;
1440
1441 fail:
1442 for (nx--; nx >= 0; nx--)
1443 xfrm_state_put(xfrm[nx]);
1444 return error;
1445 }
1446
1447 static int
1448 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1449 struct xfrm_state **xfrm, unsigned short family)
1450 {
1451 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1452 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1453 int cnx = 0;
1454 int error;
1455 int ret;
1456 int i;
1457
1458 for (i = 0; i < npols; i++) {
1459 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1460 error = -ENOBUFS;
1461 goto fail;
1462 }
1463
1464 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1465 if (ret < 0) {
1466 error = ret;
1467 goto fail;
1468 } else
1469 cnx += ret;
1470 }
1471
1472 /* found states are sorted for outbound processing */
1473 if (npols > 1)
1474 xfrm_state_sort(xfrm, tpp, cnx, family);
1475
1476 return cnx;
1477
1478 fail:
1479 for (cnx--; cnx >= 0; cnx--)
1480 xfrm_state_put(tpp[cnx]);
1481 return error;
1482
1483 }
1484
1485 /* Check that the bundle accepts the flow and its components are
1486 * still valid.
1487 */
1488
1489 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1490 {
1491 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1492 int tos;
1493
1494 if (!afinfo)
1495 return -EINVAL;
1496
1497 tos = afinfo->get_tos(fl);
1498
1499 xfrm_policy_put_afinfo(afinfo);
1500
1501 return tos;
1502 }
1503
1504 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1505 {
1506 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1507 struct dst_entry *dst = &xdst->u.dst;
1508
1509 if (xdst->route == NULL) {
1510 /* Dummy bundle - if it has xfrms we were not
1511 * able to build bundle as template resolution failed.
1512 * It means we need to try again resolving. */
1513 if (xdst->num_xfrms > 0)
1514 return NULL;
1515 } else if (dst->flags & DST_XFRM_QUEUE) {
1516 return NULL;
1517 } else {
1518 /* Real bundle */
1519 if (stale_bundle(dst))
1520 return NULL;
1521 }
1522
1523 dst_hold(dst);
1524 return flo;
1525 }
1526
1527 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1528 {
1529 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1530 struct dst_entry *dst = &xdst->u.dst;
1531
1532 if (!xdst->route)
1533 return 0;
1534 if (stale_bundle(dst))
1535 return 0;
1536
1537 return 1;
1538 }
1539
1540 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1541 {
1542 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1543 struct dst_entry *dst = &xdst->u.dst;
1544
1545 dst_free(dst);
1546 }
1547
1548 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1549 .get = xfrm_bundle_flo_get,
1550 .check = xfrm_bundle_flo_check,
1551 .delete = xfrm_bundle_flo_delete,
1552 };
1553
1554 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1555 {
1556 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1557 struct dst_ops *dst_ops;
1558 struct xfrm_dst *xdst;
1559
1560 if (!afinfo)
1561 return ERR_PTR(-EINVAL);
1562
1563 switch (family) {
1564 case AF_INET:
1565 dst_ops = &net->xfrm.xfrm4_dst_ops;
1566 break;
1567 #if IS_ENABLED(CONFIG_IPV6)
1568 case AF_INET6:
1569 dst_ops = &net->xfrm.xfrm6_dst_ops;
1570 break;
1571 #endif
1572 default:
1573 BUG();
1574 }
1575 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1576
1577 if (likely(xdst)) {
1578 struct dst_entry *dst = &xdst->u.dst;
1579
1580 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1581 xdst->flo.ops = &xfrm_bundle_fc_ops;
1582 if (afinfo->init_dst)
1583 afinfo->init_dst(net, xdst);
1584 } else
1585 xdst = ERR_PTR(-ENOBUFS);
1586
1587 xfrm_policy_put_afinfo(afinfo);
1588
1589 return xdst;
1590 }
1591
1592 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1593 int nfheader_len)
1594 {
1595 struct xfrm_policy_afinfo *afinfo =
1596 xfrm_policy_get_afinfo(dst->ops->family);
1597 int err;
1598
1599 if (!afinfo)
1600 return -EINVAL;
1601
1602 err = afinfo->init_path(path, dst, nfheader_len);
1603
1604 xfrm_policy_put_afinfo(afinfo);
1605
1606 return err;
1607 }
1608
1609 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1610 const struct flowi *fl)
1611 {
1612 struct xfrm_policy_afinfo *afinfo =
1613 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1614 int err;
1615
1616 if (!afinfo)
1617 return -EINVAL;
1618
1619 err = afinfo->fill_dst(xdst, dev, fl);
1620
1621 xfrm_policy_put_afinfo(afinfo);
1622
1623 return err;
1624 }
1625
1626
1627 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1628 * all the metrics... Shortly, bundle a bundle.
1629 */
1630
1631 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1632 struct xfrm_state **xfrm, int nx,
1633 const struct flowi *fl,
1634 struct dst_entry *dst)
1635 {
1636 struct net *net = xp_net(policy);
1637 unsigned long now = jiffies;
1638 struct net_device *dev;
1639 struct xfrm_mode *inner_mode;
1640 struct dst_entry *dst_prev = NULL;
1641 struct dst_entry *dst0 = NULL;
1642 int i = 0;
1643 int err;
1644 int header_len = 0;
1645 int nfheader_len = 0;
1646 int trailer_len = 0;
1647 int tos;
1648 int family = policy->selector.family;
1649 xfrm_address_t saddr, daddr;
1650
1651 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1652
1653 tos = xfrm_get_tos(fl, family);
1654 err = tos;
1655 if (tos < 0)
1656 goto put_states;
1657
1658 dst_hold(dst);
1659
1660 for (; i < nx; i++) {
1661 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1662 struct dst_entry *dst1 = &xdst->u.dst;
1663
1664 err = PTR_ERR(xdst);
1665 if (IS_ERR(xdst)) {
1666 dst_release(dst);
1667 goto put_states;
1668 }
1669
1670 if (xfrm[i]->sel.family == AF_UNSPEC) {
1671 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1672 xfrm_af2proto(family));
1673 if (!inner_mode) {
1674 err = -EAFNOSUPPORT;
1675 dst_release(dst);
1676 goto put_states;
1677 }
1678 } else
1679 inner_mode = xfrm[i]->inner_mode;
1680
1681 if (!dst_prev)
1682 dst0 = dst1;
1683 else {
1684 dst_prev->child = dst_clone(dst1);
1685 dst1->flags |= DST_NOHASH;
1686 }
1687
1688 xdst->route = dst;
1689 dst_copy_metrics(dst1, dst);
1690
1691 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1692 family = xfrm[i]->props.family;
1693 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1694 family);
1695 err = PTR_ERR(dst);
1696 if (IS_ERR(dst))
1697 goto put_states;
1698 } else
1699 dst_hold(dst);
1700
1701 dst1->xfrm = xfrm[i];
1702 xdst->xfrm_genid = xfrm[i]->genid;
1703
1704 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1705 dst1->flags |= DST_HOST;
1706 dst1->lastuse = now;
1707
1708 dst1->input = dst_discard;
1709 dst1->output = inner_mode->afinfo->output;
1710
1711 dst1->next = dst_prev;
1712 dst_prev = dst1;
1713
1714 header_len += xfrm[i]->props.header_len;
1715 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1716 nfheader_len += xfrm[i]->props.header_len;
1717 trailer_len += xfrm[i]->props.trailer_len;
1718 }
1719
1720 dst_prev->child = dst;
1721 dst0->path = dst;
1722
1723 err = -ENODEV;
1724 dev = dst->dev;
1725 if (!dev)
1726 goto free_dst;
1727
1728 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1729 xfrm_init_pmtu(dst_prev);
1730
1731 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1732 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1733
1734 err = xfrm_fill_dst(xdst, dev, fl);
1735 if (err)
1736 goto free_dst;
1737
1738 dst_prev->header_len = header_len;
1739 dst_prev->trailer_len = trailer_len;
1740 header_len -= xdst->u.dst.xfrm->props.header_len;
1741 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1742 }
1743
1744 out:
1745 return dst0;
1746
1747 put_states:
1748 for (; i < nx; i++)
1749 xfrm_state_put(xfrm[i]);
1750 free_dst:
1751 if (dst0)
1752 dst_free(dst0);
1753 dst0 = ERR_PTR(err);
1754 goto out;
1755 }
1756
1757 #ifdef CONFIG_XFRM_SUB_POLICY
1758 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1759 {
1760 if (!*target) {
1761 *target = kmalloc(size, GFP_ATOMIC);
1762 if (!*target)
1763 return -ENOMEM;
1764 }
1765
1766 memcpy(*target, src, size);
1767 return 0;
1768 }
1769 #endif
1770
1771 static int xfrm_dst_update_parent(struct dst_entry *dst,
1772 const struct xfrm_selector *sel)
1773 {
1774 #ifdef CONFIG_XFRM_SUB_POLICY
1775 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1776 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1777 sel, sizeof(*sel));
1778 #else
1779 return 0;
1780 #endif
1781 }
1782
1783 static int xfrm_dst_update_origin(struct dst_entry *dst,
1784 const struct flowi *fl)
1785 {
1786 #ifdef CONFIG_XFRM_SUB_POLICY
1787 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1788 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1789 #else
1790 return 0;
1791 #endif
1792 }
1793
1794 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1795 struct xfrm_policy **pols,
1796 int *num_pols, int *num_xfrms)
1797 {
1798 int i;
1799
1800 if (*num_pols == 0 || !pols[0]) {
1801 *num_pols = 0;
1802 *num_xfrms = 0;
1803 return 0;
1804 }
1805 if (IS_ERR(pols[0]))
1806 return PTR_ERR(pols[0]);
1807
1808 *num_xfrms = pols[0]->xfrm_nr;
1809
1810 #ifdef CONFIG_XFRM_SUB_POLICY
1811 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1812 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1813 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1814 XFRM_POLICY_TYPE_MAIN,
1815 fl, family,
1816 XFRM_POLICY_OUT);
1817 if (pols[1]) {
1818 if (IS_ERR(pols[1])) {
1819 xfrm_pols_put(pols, *num_pols);
1820 return PTR_ERR(pols[1]);
1821 }
1822 (*num_pols)++;
1823 (*num_xfrms) += pols[1]->xfrm_nr;
1824 }
1825 }
1826 #endif
1827 for (i = 0; i < *num_pols; i++) {
1828 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1829 *num_xfrms = -1;
1830 break;
1831 }
1832 }
1833
1834 return 0;
1835
1836 }
1837
1838 static struct xfrm_dst *
1839 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1840 const struct flowi *fl, u16 family,
1841 struct dst_entry *dst_orig)
1842 {
1843 struct net *net = xp_net(pols[0]);
1844 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1845 struct dst_entry *dst;
1846 struct xfrm_dst *xdst;
1847 int err;
1848
1849 /* Try to instantiate a bundle */
1850 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1851 if (err <= 0) {
1852 if (err != 0 && err != -EAGAIN)
1853 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1854 return ERR_PTR(err);
1855 }
1856
1857 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1858 if (IS_ERR(dst)) {
1859 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1860 return ERR_CAST(dst);
1861 }
1862
1863 xdst = (struct xfrm_dst *)dst;
1864 xdst->num_xfrms = err;
1865 if (num_pols > 1)
1866 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1867 else
1868 err = xfrm_dst_update_origin(dst, fl);
1869 if (unlikely(err)) {
1870 dst_free(dst);
1871 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1872 return ERR_PTR(err);
1873 }
1874
1875 xdst->num_pols = num_pols;
1876 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1877 xdst->policy_genid = atomic_read(&pols[0]->genid);
1878
1879 return xdst;
1880 }
1881
1882 static void xfrm_policy_queue_process(unsigned long arg)
1883 {
1884 struct sk_buff *skb;
1885 struct sock *sk;
1886 struct dst_entry *dst;
1887 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1888 struct xfrm_policy_queue *pq = &pol->polq;
1889 struct flowi fl;
1890 struct sk_buff_head list;
1891
1892 spin_lock(&pq->hold_queue.lock);
1893 skb = skb_peek(&pq->hold_queue);
1894 if (!skb) {
1895 spin_unlock(&pq->hold_queue.lock);
1896 goto out;
1897 }
1898 dst = skb_dst(skb);
1899 sk = skb->sk;
1900 xfrm_decode_session(skb, &fl, dst->ops->family);
1901 spin_unlock(&pq->hold_queue.lock);
1902
1903 dst_hold(dst->path);
1904 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1905 sk, 0);
1906 if (IS_ERR(dst))
1907 goto purge_queue;
1908
1909 if (dst->flags & DST_XFRM_QUEUE) {
1910 dst_release(dst);
1911
1912 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1913 goto purge_queue;
1914
1915 pq->timeout = pq->timeout << 1;
1916 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1917 xfrm_pol_hold(pol);
1918 goto out;
1919 }
1920
1921 dst_release(dst);
1922
1923 __skb_queue_head_init(&list);
1924
1925 spin_lock(&pq->hold_queue.lock);
1926 pq->timeout = 0;
1927 skb_queue_splice_init(&pq->hold_queue, &list);
1928 spin_unlock(&pq->hold_queue.lock);
1929
1930 while (!skb_queue_empty(&list)) {
1931 skb = __skb_dequeue(&list);
1932
1933 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1934 dst_hold(skb_dst(skb)->path);
1935 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1936 &fl, skb->sk, 0);
1937 if (IS_ERR(dst)) {
1938 kfree_skb(skb);
1939 continue;
1940 }
1941
1942 nf_reset(skb);
1943 skb_dst_drop(skb);
1944 skb_dst_set(skb, dst);
1945
1946 dst_output(skb);
1947 }
1948
1949 out:
1950 xfrm_pol_put(pol);
1951 return;
1952
1953 purge_queue:
1954 pq->timeout = 0;
1955 skb_queue_purge(&pq->hold_queue);
1956 xfrm_pol_put(pol);
1957 }
1958
1959 static int xdst_queue_output(struct sock *sk, struct sk_buff *skb)
1960 {
1961 unsigned long sched_next;
1962 struct dst_entry *dst = skb_dst(skb);
1963 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1964 struct xfrm_policy *pol = xdst->pols[0];
1965 struct xfrm_policy_queue *pq = &pol->polq;
1966
1967 if (unlikely(skb_fclone_busy(sk, skb))) {
1968 kfree_skb(skb);
1969 return 0;
1970 }
1971
1972 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1973 kfree_skb(skb);
1974 return -EAGAIN;
1975 }
1976
1977 skb_dst_force(skb);
1978
1979 spin_lock_bh(&pq->hold_queue.lock);
1980
1981 if (!pq->timeout)
1982 pq->timeout = XFRM_QUEUE_TMO_MIN;
1983
1984 sched_next = jiffies + pq->timeout;
1985
1986 if (del_timer(&pq->hold_timer)) {
1987 if (time_before(pq->hold_timer.expires, sched_next))
1988 sched_next = pq->hold_timer.expires;
1989 xfrm_pol_put(pol);
1990 }
1991
1992 __skb_queue_tail(&pq->hold_queue, skb);
1993 if (!mod_timer(&pq->hold_timer, sched_next))
1994 xfrm_pol_hold(pol);
1995
1996 spin_unlock_bh(&pq->hold_queue.lock);
1997
1998 return 0;
1999 }
2000
2001 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
2002 struct xfrm_flo *xflo,
2003 const struct flowi *fl,
2004 int num_xfrms,
2005 u16 family)
2006 {
2007 int err;
2008 struct net_device *dev;
2009 struct dst_entry *dst;
2010 struct dst_entry *dst1;
2011 struct xfrm_dst *xdst;
2012
2013 xdst = xfrm_alloc_dst(net, family);
2014 if (IS_ERR(xdst))
2015 return xdst;
2016
2017 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2018 net->xfrm.sysctl_larval_drop ||
2019 num_xfrms <= 0)
2020 return xdst;
2021
2022 dst = xflo->dst_orig;
2023 dst1 = &xdst->u.dst;
2024 dst_hold(dst);
2025 xdst->route = dst;
2026
2027 dst_copy_metrics(dst1, dst);
2028
2029 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2030 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2031 dst1->lastuse = jiffies;
2032
2033 dst1->input = dst_discard;
2034 dst1->output = xdst_queue_output;
2035
2036 dst_hold(dst);
2037 dst1->child = dst;
2038 dst1->path = dst;
2039
2040 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2041
2042 err = -ENODEV;
2043 dev = dst->dev;
2044 if (!dev)
2045 goto free_dst;
2046
2047 err = xfrm_fill_dst(xdst, dev, fl);
2048 if (err)
2049 goto free_dst;
2050
2051 out:
2052 return xdst;
2053
2054 free_dst:
2055 dst_release(dst1);
2056 xdst = ERR_PTR(err);
2057 goto out;
2058 }
2059
2060 static struct flow_cache_object *
2061 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
2062 struct flow_cache_object *oldflo, void *ctx)
2063 {
2064 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
2065 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2066 struct xfrm_dst *xdst, *new_xdst;
2067 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2068
2069 /* Check if the policies from old bundle are usable */
2070 xdst = NULL;
2071 if (oldflo) {
2072 xdst = container_of(oldflo, struct xfrm_dst, flo);
2073 num_pols = xdst->num_pols;
2074 num_xfrms = xdst->num_xfrms;
2075 pol_dead = 0;
2076 for (i = 0; i < num_pols; i++) {
2077 pols[i] = xdst->pols[i];
2078 pol_dead |= pols[i]->walk.dead;
2079 }
2080 if (pol_dead) {
2081 dst_free(&xdst->u.dst);
2082 xdst = NULL;
2083 num_pols = 0;
2084 num_xfrms = 0;
2085 oldflo = NULL;
2086 }
2087 }
2088
2089 /* Resolve policies to use if we couldn't get them from
2090 * previous cache entry */
2091 if (xdst == NULL) {
2092 num_pols = 1;
2093 pols[0] = __xfrm_policy_lookup(net, fl, family,
2094 flow_to_policy_dir(dir));
2095 err = xfrm_expand_policies(fl, family, pols,
2096 &num_pols, &num_xfrms);
2097 if (err < 0)
2098 goto inc_error;
2099 if (num_pols == 0)
2100 return NULL;
2101 if (num_xfrms <= 0)
2102 goto make_dummy_bundle;
2103 }
2104
2105 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2106 xflo->dst_orig);
2107 if (IS_ERR(new_xdst)) {
2108 err = PTR_ERR(new_xdst);
2109 if (err != -EAGAIN)
2110 goto error;
2111 if (oldflo == NULL)
2112 goto make_dummy_bundle;
2113 dst_hold(&xdst->u.dst);
2114 return oldflo;
2115 } else if (new_xdst == NULL) {
2116 num_xfrms = 0;
2117 if (oldflo == NULL)
2118 goto make_dummy_bundle;
2119 xdst->num_xfrms = 0;
2120 dst_hold(&xdst->u.dst);
2121 return oldflo;
2122 }
2123
2124 /* Kill the previous bundle */
2125 if (xdst) {
2126 /* The policies were stolen for newly generated bundle */
2127 xdst->num_pols = 0;
2128 dst_free(&xdst->u.dst);
2129 }
2130
2131 /* Flow cache does not have reference, it dst_free()'s,
2132 * but we do need to return one reference for original caller */
2133 dst_hold(&new_xdst->u.dst);
2134 return &new_xdst->flo;
2135
2136 make_dummy_bundle:
2137 /* We found policies, but there's no bundles to instantiate:
2138 * either because the policy blocks, has no transformations or
2139 * we could not build template (no xfrm_states).*/
2140 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2141 if (IS_ERR(xdst)) {
2142 xfrm_pols_put(pols, num_pols);
2143 return ERR_CAST(xdst);
2144 }
2145 xdst->num_pols = num_pols;
2146 xdst->num_xfrms = num_xfrms;
2147 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2148
2149 dst_hold(&xdst->u.dst);
2150 return &xdst->flo;
2151
2152 inc_error:
2153 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2154 error:
2155 if (xdst != NULL)
2156 dst_free(&xdst->u.dst);
2157 else
2158 xfrm_pols_put(pols, num_pols);
2159 return ERR_PTR(err);
2160 }
2161
2162 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2163 struct dst_entry *dst_orig)
2164 {
2165 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2166 struct dst_entry *ret;
2167
2168 if (!afinfo) {
2169 dst_release(dst_orig);
2170 return ERR_PTR(-EINVAL);
2171 } else {
2172 ret = afinfo->blackhole_route(net, dst_orig);
2173 }
2174 xfrm_policy_put_afinfo(afinfo);
2175
2176 return ret;
2177 }
2178
2179 /* Main function: finds/creates a bundle for given flow.
2180 *
2181 * At the moment we eat a raw IP route. Mostly to speed up lookups
2182 * on interfaces with disabled IPsec.
2183 */
2184 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2185 const struct flowi *fl,
2186 struct sock *sk, int flags)
2187 {
2188 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2189 struct flow_cache_object *flo;
2190 struct xfrm_dst *xdst;
2191 struct dst_entry *dst, *route;
2192 u16 family = dst_orig->ops->family;
2193 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2194 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2195
2196 dst = NULL;
2197 xdst = NULL;
2198 route = NULL;
2199
2200 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2201 num_pols = 1;
2202 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2203 err = xfrm_expand_policies(fl, family, pols,
2204 &num_pols, &num_xfrms);
2205 if (err < 0)
2206 goto dropdst;
2207
2208 if (num_pols) {
2209 if (num_xfrms <= 0) {
2210 drop_pols = num_pols;
2211 goto no_transform;
2212 }
2213
2214 xdst = xfrm_resolve_and_create_bundle(
2215 pols, num_pols, fl,
2216 family, dst_orig);
2217 if (IS_ERR(xdst)) {
2218 xfrm_pols_put(pols, num_pols);
2219 err = PTR_ERR(xdst);
2220 goto dropdst;
2221 } else if (xdst == NULL) {
2222 num_xfrms = 0;
2223 drop_pols = num_pols;
2224 goto no_transform;
2225 }
2226
2227 dst_hold(&xdst->u.dst);
2228 xdst->u.dst.flags |= DST_NOCACHE;
2229 route = xdst->route;
2230 }
2231 }
2232
2233 if (xdst == NULL) {
2234 struct xfrm_flo xflo;
2235
2236 xflo.dst_orig = dst_orig;
2237 xflo.flags = flags;
2238
2239 /* To accelerate a bit... */
2240 if ((dst_orig->flags & DST_NOXFRM) ||
2241 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2242 goto nopol;
2243
2244 flo = flow_cache_lookup(net, fl, family, dir,
2245 xfrm_bundle_lookup, &xflo);
2246 if (flo == NULL)
2247 goto nopol;
2248 if (IS_ERR(flo)) {
2249 err = PTR_ERR(flo);
2250 goto dropdst;
2251 }
2252 xdst = container_of(flo, struct xfrm_dst, flo);
2253
2254 num_pols = xdst->num_pols;
2255 num_xfrms = xdst->num_xfrms;
2256 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2257 route = xdst->route;
2258 }
2259
2260 dst = &xdst->u.dst;
2261 if (route == NULL && num_xfrms > 0) {
2262 /* The only case when xfrm_bundle_lookup() returns a
2263 * bundle with null route, is when the template could
2264 * not be resolved. It means policies are there, but
2265 * bundle could not be created, since we don't yet
2266 * have the xfrm_state's. We need to wait for KM to
2267 * negotiate new SA's or bail out with error.*/
2268 if (net->xfrm.sysctl_larval_drop) {
2269 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2270 err = -EREMOTE;
2271 goto error;
2272 }
2273
2274 err = -EAGAIN;
2275
2276 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2277 goto error;
2278 }
2279
2280 no_transform:
2281 if (num_pols == 0)
2282 goto nopol;
2283
2284 if ((flags & XFRM_LOOKUP_ICMP) &&
2285 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2286 err = -ENOENT;
2287 goto error;
2288 }
2289
2290 for (i = 0; i < num_pols; i++)
2291 pols[i]->curlft.use_time = get_seconds();
2292
2293 if (num_xfrms < 0) {
2294 /* Prohibit the flow */
2295 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2296 err = -EPERM;
2297 goto error;
2298 } else if (num_xfrms > 0) {
2299 /* Flow transformed */
2300 dst_release(dst_orig);
2301 } else {
2302 /* Flow passes untransformed */
2303 dst_release(dst);
2304 dst = dst_orig;
2305 }
2306 ok:
2307 xfrm_pols_put(pols, drop_pols);
2308 if (dst && dst->xfrm &&
2309 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2310 dst->flags |= DST_XFRM_TUNNEL;
2311 return dst;
2312
2313 nopol:
2314 if (!(flags & XFRM_LOOKUP_ICMP)) {
2315 dst = dst_orig;
2316 goto ok;
2317 }
2318 err = -ENOENT;
2319 error:
2320 dst_release(dst);
2321 dropdst:
2322 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2323 dst_release(dst_orig);
2324 xfrm_pols_put(pols, drop_pols);
2325 return ERR_PTR(err);
2326 }
2327 EXPORT_SYMBOL(xfrm_lookup);
2328
2329 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2330 * Otherwise we may send out blackholed packets.
2331 */
2332 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2333 const struct flowi *fl,
2334 struct sock *sk, int flags)
2335 {
2336 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2337 flags | XFRM_LOOKUP_QUEUE |
2338 XFRM_LOOKUP_KEEP_DST_REF);
2339
2340 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2341 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2342
2343 return dst;
2344 }
2345 EXPORT_SYMBOL(xfrm_lookup_route);
2346
2347 static inline int
2348 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2349 {
2350 struct xfrm_state *x;
2351
2352 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2353 return 0;
2354 x = skb->sp->xvec[idx];
2355 if (!x->type->reject)
2356 return 0;
2357 return x->type->reject(x, skb, fl);
2358 }
2359
2360 /* When skb is transformed back to its "native" form, we have to
2361 * check policy restrictions. At the moment we make this in maximally
2362 * stupid way. Shame on me. :-) Of course, connected sockets must
2363 * have policy cached at them.
2364 */
2365
2366 static inline int
2367 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2368 unsigned short family)
2369 {
2370 if (xfrm_state_kern(x))
2371 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2372 return x->id.proto == tmpl->id.proto &&
2373 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2374 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2375 x->props.mode == tmpl->mode &&
2376 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2377 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2378 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2379 xfrm_state_addr_cmp(tmpl, x, family));
2380 }
2381
2382 /*
2383 * 0 or more than 0 is returned when validation is succeeded (either bypass
2384 * because of optional transport mode, or next index of the mathced secpath
2385 * state with the template.
2386 * -1 is returned when no matching template is found.
2387 * Otherwise "-2 - errored_index" is returned.
2388 */
2389 static inline int
2390 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2391 unsigned short family)
2392 {
2393 int idx = start;
2394
2395 if (tmpl->optional) {
2396 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2397 return start;
2398 } else
2399 start = -1;
2400 for (; idx < sp->len; idx++) {
2401 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2402 return ++idx;
2403 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2404 if (start == -1)
2405 start = -2-idx;
2406 break;
2407 }
2408 }
2409 return start;
2410 }
2411
2412 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2413 unsigned int family, int reverse)
2414 {
2415 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2416 int err;
2417
2418 if (unlikely(afinfo == NULL))
2419 return -EAFNOSUPPORT;
2420
2421 afinfo->decode_session(skb, fl, reverse);
2422 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2423 xfrm_policy_put_afinfo(afinfo);
2424 return err;
2425 }
2426 EXPORT_SYMBOL(__xfrm_decode_session);
2427
2428 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2429 {
2430 for (; k < sp->len; k++) {
2431 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2432 *idxp = k;
2433 return 1;
2434 }
2435 }
2436
2437 return 0;
2438 }
2439
2440 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2441 unsigned short family)
2442 {
2443 struct net *net = dev_net(skb->dev);
2444 struct xfrm_policy *pol;
2445 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2446 int npols = 0;
2447 int xfrm_nr;
2448 int pi;
2449 int reverse;
2450 struct flowi fl;
2451 u8 fl_dir;
2452 int xerr_idx = -1;
2453
2454 reverse = dir & ~XFRM_POLICY_MASK;
2455 dir &= XFRM_POLICY_MASK;
2456 fl_dir = policy_to_flow_dir(dir);
2457
2458 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2459 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2460 return 0;
2461 }
2462
2463 nf_nat_decode_session(skb, &fl, family);
2464
2465 /* First, check used SA against their selectors. */
2466 if (skb->sp) {
2467 int i;
2468
2469 for (i = skb->sp->len-1; i >= 0; i--) {
2470 struct xfrm_state *x = skb->sp->xvec[i];
2471 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2472 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2473 return 0;
2474 }
2475 }
2476 }
2477
2478 pol = NULL;
2479 if (sk && sk->sk_policy[dir]) {
2480 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2481 if (IS_ERR(pol)) {
2482 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2483 return 0;
2484 }
2485 }
2486
2487 if (!pol) {
2488 struct flow_cache_object *flo;
2489
2490 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2491 xfrm_policy_lookup, NULL);
2492 if (IS_ERR_OR_NULL(flo))
2493 pol = ERR_CAST(flo);
2494 else
2495 pol = container_of(flo, struct xfrm_policy, flo);
2496 }
2497
2498 if (IS_ERR(pol)) {
2499 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2500 return 0;
2501 }
2502
2503 if (!pol) {
2504 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2505 xfrm_secpath_reject(xerr_idx, skb, &fl);
2506 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2507 return 0;
2508 }
2509 return 1;
2510 }
2511
2512 pol->curlft.use_time = get_seconds();
2513
2514 pols[0] = pol;
2515 npols++;
2516 #ifdef CONFIG_XFRM_SUB_POLICY
2517 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2518 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2519 &fl, family,
2520 XFRM_POLICY_IN);
2521 if (pols[1]) {
2522 if (IS_ERR(pols[1])) {
2523 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2524 return 0;
2525 }
2526 pols[1]->curlft.use_time = get_seconds();
2527 npols++;
2528 }
2529 }
2530 #endif
2531
2532 if (pol->action == XFRM_POLICY_ALLOW) {
2533 struct sec_path *sp;
2534 static struct sec_path dummy;
2535 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2536 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2537 struct xfrm_tmpl **tpp = tp;
2538 int ti = 0;
2539 int i, k;
2540
2541 if ((sp = skb->sp) == NULL)
2542 sp = &dummy;
2543
2544 for (pi = 0; pi < npols; pi++) {
2545 if (pols[pi] != pol &&
2546 pols[pi]->action != XFRM_POLICY_ALLOW) {
2547 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2548 goto reject;
2549 }
2550 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2551 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2552 goto reject_error;
2553 }
2554 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2555 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2556 }
2557 xfrm_nr = ti;
2558 if (npols > 1) {
2559 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2560 tpp = stp;
2561 }
2562
2563 /* For each tunnel xfrm, find the first matching tmpl.
2564 * For each tmpl before that, find corresponding xfrm.
2565 * Order is _important_. Later we will implement
2566 * some barriers, but at the moment barriers
2567 * are implied between each two transformations.
2568 */
2569 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2570 k = xfrm_policy_ok(tpp[i], sp, k, family);
2571 if (k < 0) {
2572 if (k < -1)
2573 /* "-2 - errored_index" returned */
2574 xerr_idx = -(2+k);
2575 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2576 goto reject;
2577 }
2578 }
2579
2580 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2581 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2582 goto reject;
2583 }
2584
2585 xfrm_pols_put(pols, npols);
2586 return 1;
2587 }
2588 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2589
2590 reject:
2591 xfrm_secpath_reject(xerr_idx, skb, &fl);
2592 reject_error:
2593 xfrm_pols_put(pols, npols);
2594 return 0;
2595 }
2596 EXPORT_SYMBOL(__xfrm_policy_check);
2597
2598 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2599 {
2600 struct net *net = dev_net(skb->dev);
2601 struct flowi fl;
2602 struct dst_entry *dst;
2603 int res = 1;
2604
2605 if (xfrm_decode_session(skb, &fl, family) < 0) {
2606 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2607 return 0;
2608 }
2609
2610 skb_dst_force(skb);
2611
2612 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2613 if (IS_ERR(dst)) {
2614 res = 0;
2615 dst = NULL;
2616 }
2617 skb_dst_set(skb, dst);
2618 return res;
2619 }
2620 EXPORT_SYMBOL(__xfrm_route_forward);
2621
2622 /* Optimize later using cookies and generation ids. */
2623
2624 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2625 {
2626 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2627 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2628 * get validated by dst_ops->check on every use. We do this
2629 * because when a normal route referenced by an XFRM dst is
2630 * obsoleted we do not go looking around for all parent
2631 * referencing XFRM dsts so that we can invalidate them. It
2632 * is just too much work. Instead we make the checks here on
2633 * every use. For example:
2634 *
2635 * XFRM dst A --> IPv4 dst X
2636 *
2637 * X is the "xdst->route" of A (X is also the "dst->path" of A
2638 * in this example). If X is marked obsolete, "A" will not
2639 * notice. That's what we are validating here via the
2640 * stale_bundle() check.
2641 *
2642 * When a policy's bundle is pruned, we dst_free() the XFRM
2643 * dst which causes it's ->obsolete field to be set to
2644 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2645 * this, we want to force a new route lookup.
2646 */
2647 if (dst->obsolete < 0 && !stale_bundle(dst))
2648 return dst;
2649
2650 return NULL;
2651 }
2652
2653 static int stale_bundle(struct dst_entry *dst)
2654 {
2655 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2656 }
2657
2658 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2659 {
2660 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2661 dst->dev = dev_net(dev)->loopback_dev;
2662 dev_hold(dst->dev);
2663 dev_put(dev);
2664 }
2665 }
2666 EXPORT_SYMBOL(xfrm_dst_ifdown);
2667
2668 static void xfrm_link_failure(struct sk_buff *skb)
2669 {
2670 /* Impossible. Such dst must be popped before reaches point of failure. */
2671 }
2672
2673 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2674 {
2675 if (dst) {
2676 if (dst->obsolete) {
2677 dst_release(dst);
2678 dst = NULL;
2679 }
2680 }
2681 return dst;
2682 }
2683
2684 void xfrm_garbage_collect(struct net *net)
2685 {
2686 flow_cache_flush(net);
2687 }
2688 EXPORT_SYMBOL(xfrm_garbage_collect);
2689
2690 static void xfrm_garbage_collect_deferred(struct net *net)
2691 {
2692 flow_cache_flush_deferred(net);
2693 }
2694
2695 static void xfrm_init_pmtu(struct dst_entry *dst)
2696 {
2697 do {
2698 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2699 u32 pmtu, route_mtu_cached;
2700
2701 pmtu = dst_mtu(dst->child);
2702 xdst->child_mtu_cached = pmtu;
2703
2704 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2705
2706 route_mtu_cached = dst_mtu(xdst->route);
2707 xdst->route_mtu_cached = route_mtu_cached;
2708
2709 if (pmtu > route_mtu_cached)
2710 pmtu = route_mtu_cached;
2711
2712 dst_metric_set(dst, RTAX_MTU, pmtu);
2713 } while ((dst = dst->next));
2714 }
2715
2716 /* Check that the bundle accepts the flow and its components are
2717 * still valid.
2718 */
2719
2720 static int xfrm_bundle_ok(struct xfrm_dst *first)
2721 {
2722 struct dst_entry *dst = &first->u.dst;
2723 struct xfrm_dst *last;
2724 u32 mtu;
2725
2726 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2727 (dst->dev && !netif_running(dst->dev)))
2728 return 0;
2729
2730 if (dst->flags & DST_XFRM_QUEUE)
2731 return 1;
2732
2733 last = NULL;
2734
2735 do {
2736 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2737
2738 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2739 return 0;
2740 if (xdst->xfrm_genid != dst->xfrm->genid)
2741 return 0;
2742 if (xdst->num_pols > 0 &&
2743 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2744 return 0;
2745
2746 mtu = dst_mtu(dst->child);
2747 if (xdst->child_mtu_cached != mtu) {
2748 last = xdst;
2749 xdst->child_mtu_cached = mtu;
2750 }
2751
2752 if (!dst_check(xdst->route, xdst->route_cookie))
2753 return 0;
2754 mtu = dst_mtu(xdst->route);
2755 if (xdst->route_mtu_cached != mtu) {
2756 last = xdst;
2757 xdst->route_mtu_cached = mtu;
2758 }
2759
2760 dst = dst->child;
2761 } while (dst->xfrm);
2762
2763 if (likely(!last))
2764 return 1;
2765
2766 mtu = last->child_mtu_cached;
2767 for (;;) {
2768 dst = &last->u.dst;
2769
2770 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2771 if (mtu > last->route_mtu_cached)
2772 mtu = last->route_mtu_cached;
2773 dst_metric_set(dst, RTAX_MTU, mtu);
2774
2775 if (last == first)
2776 break;
2777
2778 last = (struct xfrm_dst *)last->u.dst.next;
2779 last->child_mtu_cached = mtu;
2780 }
2781
2782 return 1;
2783 }
2784
2785 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2786 {
2787 return dst_metric_advmss(dst->path);
2788 }
2789
2790 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2791 {
2792 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2793
2794 return mtu ? : dst_mtu(dst->path);
2795 }
2796
2797 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2798 struct sk_buff *skb,
2799 const void *daddr)
2800 {
2801 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2802 }
2803
2804 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2805 {
2806 struct net *net;
2807 int err = 0;
2808 if (unlikely(afinfo == NULL))
2809 return -EINVAL;
2810 if (unlikely(afinfo->family >= NPROTO))
2811 return -EAFNOSUPPORT;
2812 spin_lock(&xfrm_policy_afinfo_lock);
2813 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2814 err = -EEXIST;
2815 else {
2816 struct dst_ops *dst_ops = afinfo->dst_ops;
2817 if (likely(dst_ops->kmem_cachep == NULL))
2818 dst_ops->kmem_cachep = xfrm_dst_cache;
2819 if (likely(dst_ops->check == NULL))
2820 dst_ops->check = xfrm_dst_check;
2821 if (likely(dst_ops->default_advmss == NULL))
2822 dst_ops->default_advmss = xfrm_default_advmss;
2823 if (likely(dst_ops->mtu == NULL))
2824 dst_ops->mtu = xfrm_mtu;
2825 if (likely(dst_ops->negative_advice == NULL))
2826 dst_ops->negative_advice = xfrm_negative_advice;
2827 if (likely(dst_ops->link_failure == NULL))
2828 dst_ops->link_failure = xfrm_link_failure;
2829 if (likely(dst_ops->neigh_lookup == NULL))
2830 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2831 if (likely(afinfo->garbage_collect == NULL))
2832 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2833 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2834 }
2835 spin_unlock(&xfrm_policy_afinfo_lock);
2836
2837 rtnl_lock();
2838 for_each_net(net) {
2839 struct dst_ops *xfrm_dst_ops;
2840
2841 switch (afinfo->family) {
2842 case AF_INET:
2843 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2844 break;
2845 #if IS_ENABLED(CONFIG_IPV6)
2846 case AF_INET6:
2847 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2848 break;
2849 #endif
2850 default:
2851 BUG();
2852 }
2853 *xfrm_dst_ops = *afinfo->dst_ops;
2854 }
2855 rtnl_unlock();
2856
2857 return err;
2858 }
2859 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2860
2861 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2862 {
2863 int err = 0;
2864 if (unlikely(afinfo == NULL))
2865 return -EINVAL;
2866 if (unlikely(afinfo->family >= NPROTO))
2867 return -EAFNOSUPPORT;
2868 spin_lock(&xfrm_policy_afinfo_lock);
2869 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2870 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2871 err = -EINVAL;
2872 else
2873 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2874 NULL);
2875 }
2876 spin_unlock(&xfrm_policy_afinfo_lock);
2877 if (!err) {
2878 struct dst_ops *dst_ops = afinfo->dst_ops;
2879
2880 synchronize_rcu();
2881
2882 dst_ops->kmem_cachep = NULL;
2883 dst_ops->check = NULL;
2884 dst_ops->negative_advice = NULL;
2885 dst_ops->link_failure = NULL;
2886 afinfo->garbage_collect = NULL;
2887 }
2888 return err;
2889 }
2890 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2891
2892 static void __net_init xfrm_dst_ops_init(struct net *net)
2893 {
2894 struct xfrm_policy_afinfo *afinfo;
2895
2896 rcu_read_lock();
2897 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2898 if (afinfo)
2899 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2900 #if IS_ENABLED(CONFIG_IPV6)
2901 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2902 if (afinfo)
2903 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2904 #endif
2905 rcu_read_unlock();
2906 }
2907
2908 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2909 {
2910 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2911
2912 switch (event) {
2913 case NETDEV_DOWN:
2914 xfrm_garbage_collect(dev_net(dev));
2915 }
2916 return NOTIFY_DONE;
2917 }
2918
2919 static struct notifier_block xfrm_dev_notifier = {
2920 .notifier_call = xfrm_dev_event,
2921 };
2922
2923 #ifdef CONFIG_XFRM_STATISTICS
2924 static int __net_init xfrm_statistics_init(struct net *net)
2925 {
2926 int rv;
2927 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2928 if (!net->mib.xfrm_statistics)
2929 return -ENOMEM;
2930 rv = xfrm_proc_init(net);
2931 if (rv < 0)
2932 free_percpu(net->mib.xfrm_statistics);
2933 return rv;
2934 }
2935
2936 static void xfrm_statistics_fini(struct net *net)
2937 {
2938 xfrm_proc_fini(net);
2939 free_percpu(net->mib.xfrm_statistics);
2940 }
2941 #else
2942 static int __net_init xfrm_statistics_init(struct net *net)
2943 {
2944 return 0;
2945 }
2946
2947 static void xfrm_statistics_fini(struct net *net)
2948 {
2949 }
2950 #endif
2951
2952 static int __net_init xfrm_policy_init(struct net *net)
2953 {
2954 unsigned int hmask, sz;
2955 int dir;
2956
2957 if (net_eq(net, &init_net))
2958 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2959 sizeof(struct xfrm_dst),
2960 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2961 NULL);
2962
2963 hmask = 8 - 1;
2964 sz = (hmask+1) * sizeof(struct hlist_head);
2965
2966 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2967 if (!net->xfrm.policy_byidx)
2968 goto out_byidx;
2969 net->xfrm.policy_idx_hmask = hmask;
2970
2971 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2972 struct xfrm_policy_hash *htab;
2973
2974 net->xfrm.policy_count[dir] = 0;
2975 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
2976 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2977
2978 htab = &net->xfrm.policy_bydst[dir];
2979 htab->table = xfrm_hash_alloc(sz);
2980 if (!htab->table)
2981 goto out_bydst;
2982 htab->hmask = hmask;
2983 htab->dbits4 = 32;
2984 htab->sbits4 = 32;
2985 htab->dbits6 = 128;
2986 htab->sbits6 = 128;
2987 }
2988 net->xfrm.policy_hthresh.lbits4 = 32;
2989 net->xfrm.policy_hthresh.rbits4 = 32;
2990 net->xfrm.policy_hthresh.lbits6 = 128;
2991 net->xfrm.policy_hthresh.rbits6 = 128;
2992
2993 seqlock_init(&net->xfrm.policy_hthresh.lock);
2994
2995 INIT_LIST_HEAD(&net->xfrm.policy_all);
2996 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2997 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
2998 if (net_eq(net, &init_net))
2999 register_netdevice_notifier(&xfrm_dev_notifier);
3000 return 0;
3001
3002 out_bydst:
3003 for (dir--; dir >= 0; dir--) {
3004 struct xfrm_policy_hash *htab;
3005
3006 htab = &net->xfrm.policy_bydst[dir];
3007 xfrm_hash_free(htab->table, sz);
3008 }
3009 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3010 out_byidx:
3011 return -ENOMEM;
3012 }
3013
3014 static void xfrm_policy_fini(struct net *net)
3015 {
3016 unsigned int sz;
3017 int dir;
3018
3019 flush_work(&net->xfrm.policy_hash_work);
3020 #ifdef CONFIG_XFRM_SUB_POLICY
3021 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
3022 #endif
3023 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
3024
3025 WARN_ON(!list_empty(&net->xfrm.policy_all));
3026
3027 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
3028 struct xfrm_policy_hash *htab;
3029
3030 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
3031
3032 htab = &net->xfrm.policy_bydst[dir];
3033 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
3034 WARN_ON(!hlist_empty(htab->table));
3035 xfrm_hash_free(htab->table, sz);
3036 }
3037
3038 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
3039 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3040 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3041 }
3042
3043 static int __net_init xfrm_net_init(struct net *net)
3044 {
3045 int rv;
3046
3047 rv = xfrm_statistics_init(net);
3048 if (rv < 0)
3049 goto out_statistics;
3050 rv = xfrm_state_init(net);
3051 if (rv < 0)
3052 goto out_state;
3053 rv = xfrm_policy_init(net);
3054 if (rv < 0)
3055 goto out_policy;
3056 xfrm_dst_ops_init(net);
3057 rv = xfrm_sysctl_init(net);
3058 if (rv < 0)
3059 goto out_sysctl;
3060 rv = flow_cache_init(net);
3061 if (rv < 0)
3062 goto out;
3063
3064 /* Initialize the per-net locks here */
3065 spin_lock_init(&net->xfrm.xfrm_state_lock);
3066 rwlock_init(&net->xfrm.xfrm_policy_lock);
3067 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3068
3069 return 0;
3070
3071 out:
3072 xfrm_sysctl_fini(net);
3073 out_sysctl:
3074 xfrm_policy_fini(net);
3075 out_policy:
3076 xfrm_state_fini(net);
3077 out_state:
3078 xfrm_statistics_fini(net);
3079 out_statistics:
3080 return rv;
3081 }
3082
3083 static void __net_exit xfrm_net_exit(struct net *net)
3084 {
3085 flow_cache_fini(net);
3086 xfrm_sysctl_fini(net);
3087 xfrm_policy_fini(net);
3088 xfrm_state_fini(net);
3089 xfrm_statistics_fini(net);
3090 }
3091
3092 static struct pernet_operations __net_initdata xfrm_net_ops = {
3093 .init = xfrm_net_init,
3094 .exit = xfrm_net_exit,
3095 };
3096
3097 void __init xfrm_init(void)
3098 {
3099 register_pernet_subsys(&xfrm_net_ops);
3100 xfrm_input_init();
3101 }
3102
3103 #ifdef CONFIG_AUDITSYSCALL
3104 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3105 struct audit_buffer *audit_buf)
3106 {
3107 struct xfrm_sec_ctx *ctx = xp->security;
3108 struct xfrm_selector *sel = &xp->selector;
3109
3110 if (ctx)
3111 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3112 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3113
3114 switch (sel->family) {
3115 case AF_INET:
3116 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
3117 if (sel->prefixlen_s != 32)
3118 audit_log_format(audit_buf, " src_prefixlen=%d",
3119 sel->prefixlen_s);
3120 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
3121 if (sel->prefixlen_d != 32)
3122 audit_log_format(audit_buf, " dst_prefixlen=%d",
3123 sel->prefixlen_d);
3124 break;
3125 case AF_INET6:
3126 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3127 if (sel->prefixlen_s != 128)
3128 audit_log_format(audit_buf, " src_prefixlen=%d",
3129 sel->prefixlen_s);
3130 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3131 if (sel->prefixlen_d != 128)
3132 audit_log_format(audit_buf, " dst_prefixlen=%d",
3133 sel->prefixlen_d);
3134 break;
3135 }
3136 }
3137
3138 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3139 {
3140 struct audit_buffer *audit_buf;
3141
3142 audit_buf = xfrm_audit_start("SPD-add");
3143 if (audit_buf == NULL)
3144 return;
3145 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3146 audit_log_format(audit_buf, " res=%u", result);
3147 xfrm_audit_common_policyinfo(xp, audit_buf);
3148 audit_log_end(audit_buf);
3149 }
3150 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3151
3152 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3153 bool task_valid)
3154 {
3155 struct audit_buffer *audit_buf;
3156
3157 audit_buf = xfrm_audit_start("SPD-delete");
3158 if (audit_buf == NULL)
3159 return;
3160 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3161 audit_log_format(audit_buf, " res=%u", result);
3162 xfrm_audit_common_policyinfo(xp, audit_buf);
3163 audit_log_end(audit_buf);
3164 }
3165 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3166 #endif
3167
3168 #ifdef CONFIG_XFRM_MIGRATE
3169 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3170 const struct xfrm_selector *sel_tgt)
3171 {
3172 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3173 if (sel_tgt->family == sel_cmp->family &&
3174 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3175 sel_cmp->family) &&
3176 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3177 sel_cmp->family) &&
3178 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3179 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3180 return true;
3181 }
3182 } else {
3183 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3184 return true;
3185 }
3186 }
3187 return false;
3188 }
3189
3190 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3191 u8 dir, u8 type, struct net *net)
3192 {
3193 struct xfrm_policy *pol, *ret = NULL;
3194 struct hlist_head *chain;
3195 u32 priority = ~0U;
3196
3197 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
3198 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3199 hlist_for_each_entry(pol, chain, bydst) {
3200 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3201 pol->type == type) {
3202 ret = pol;
3203 priority = ret->priority;
3204 break;
3205 }
3206 }
3207 chain = &net->xfrm.policy_inexact[dir];
3208 hlist_for_each_entry(pol, chain, bydst) {
3209 if ((pol->priority >= priority) && ret)
3210 break;
3211
3212 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3213 pol->type == type) {
3214 ret = pol;
3215 break;
3216 }
3217 }
3218
3219 xfrm_pol_hold(ret);
3220
3221 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
3222
3223 return ret;
3224 }
3225
3226 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3227 {
3228 int match = 0;
3229
3230 if (t->mode == m->mode && t->id.proto == m->proto &&
3231 (m->reqid == 0 || t->reqid == m->reqid)) {
3232 switch (t->mode) {
3233 case XFRM_MODE_TUNNEL:
3234 case XFRM_MODE_BEET:
3235 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3236 m->old_family) &&
3237 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3238 m->old_family)) {
3239 match = 1;
3240 }
3241 break;
3242 case XFRM_MODE_TRANSPORT:
3243 /* in case of transport mode, template does not store
3244 any IP addresses, hence we just compare mode and
3245 protocol */
3246 match = 1;
3247 break;
3248 default:
3249 break;
3250 }
3251 }
3252 return match;
3253 }
3254
3255 /* update endpoint address(es) of template(s) */
3256 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3257 struct xfrm_migrate *m, int num_migrate)
3258 {
3259 struct xfrm_migrate *mp;
3260 int i, j, n = 0;
3261
3262 write_lock_bh(&pol->lock);
3263 if (unlikely(pol->walk.dead)) {
3264 /* target policy has been deleted */
3265 write_unlock_bh(&pol->lock);
3266 return -ENOENT;
3267 }
3268
3269 for (i = 0; i < pol->xfrm_nr; i++) {
3270 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3271 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3272 continue;
3273 n++;
3274 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3275 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3276 continue;
3277 /* update endpoints */
3278 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3279 sizeof(pol->xfrm_vec[i].id.daddr));
3280 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3281 sizeof(pol->xfrm_vec[i].saddr));
3282 pol->xfrm_vec[i].encap_family = mp->new_family;
3283 /* flush bundles */
3284 atomic_inc(&pol->genid);
3285 }
3286 }
3287
3288 write_unlock_bh(&pol->lock);
3289
3290 if (!n)
3291 return -ENODATA;
3292
3293 return 0;
3294 }
3295
3296 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3297 {
3298 int i, j;
3299
3300 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3301 return -EINVAL;
3302
3303 for (i = 0; i < num_migrate; i++) {
3304 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3305 m[i].old_family) &&
3306 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3307 m[i].old_family))
3308 return -EINVAL;
3309 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3310 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3311 return -EINVAL;
3312
3313 /* check if there is any duplicated entry */
3314 for (j = i + 1; j < num_migrate; j++) {
3315 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3316 sizeof(m[i].old_daddr)) &&
3317 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3318 sizeof(m[i].old_saddr)) &&
3319 m[i].proto == m[j].proto &&
3320 m[i].mode == m[j].mode &&
3321 m[i].reqid == m[j].reqid &&
3322 m[i].old_family == m[j].old_family)
3323 return -EINVAL;
3324 }
3325 }
3326
3327 return 0;
3328 }
3329
3330 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3331 struct xfrm_migrate *m, int num_migrate,
3332 struct xfrm_kmaddress *k, struct net *net)
3333 {
3334 int i, err, nx_cur = 0, nx_new = 0;
3335 struct xfrm_policy *pol = NULL;
3336 struct xfrm_state *x, *xc;
3337 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3338 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3339 struct xfrm_migrate *mp;
3340
3341 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3342 goto out;
3343
3344 /* Stage 1 - find policy */
3345 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3346 err = -ENOENT;
3347 goto out;
3348 }
3349
3350 /* Stage 2 - find and update state(s) */
3351 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3352 if ((x = xfrm_migrate_state_find(mp, net))) {
3353 x_cur[nx_cur] = x;
3354 nx_cur++;
3355 if ((xc = xfrm_state_migrate(x, mp))) {
3356 x_new[nx_new] = xc;
3357 nx_new++;
3358 } else {
3359 err = -ENODATA;
3360 goto restore_state;
3361 }
3362 }
3363 }
3364
3365 /* Stage 3 - update policy */
3366 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3367 goto restore_state;
3368
3369 /* Stage 4 - delete old state(s) */
3370 if (nx_cur) {
3371 xfrm_states_put(x_cur, nx_cur);
3372 xfrm_states_delete(x_cur, nx_cur);
3373 }
3374
3375 /* Stage 5 - announce */
3376 km_migrate(sel, dir, type, m, num_migrate, k);
3377
3378 xfrm_pol_put(pol);
3379
3380 return 0;
3381 out:
3382 return err;
3383
3384 restore_state:
3385 if (pol)
3386 xfrm_pol_put(pol);
3387 if (nx_cur)
3388 xfrm_states_put(x_cur, nx_cur);
3389 if (nx_new)
3390 xfrm_states_delete(x_new, nx_new);
3391
3392 return err;
3393 }
3394 EXPORT_SYMBOL(xfrm_migrate);
3395 #endif
Linux kernel - Deliverables
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