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Merge tag 'vfio-v4.4-rc5' of git://github.com/awilliam/linux-vfio
[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,
119 int tos, int oif,
120 const xfrm_address_t *saddr,
121 const xfrm_address_t *daddr,
122 int family)
123 {
124 struct xfrm_policy_afinfo *afinfo;
125 struct dst_entry *dst;
126
127 afinfo = xfrm_policy_get_afinfo(family);
128 if (unlikely(afinfo == NULL))
129 return ERR_PTR(-EAFNOSUPPORT);
130
131 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
132
133 xfrm_policy_put_afinfo(afinfo);
134
135 return dst;
136 }
137
138 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
139 int tos, int oif,
140 xfrm_address_t *prev_saddr,
141 xfrm_address_t *prev_daddr,
142 int family)
143 {
144 struct net *net = xs_net(x);
145 xfrm_address_t *saddr = &x->props.saddr;
146 xfrm_address_t *daddr = &x->id.daddr;
147 struct dst_entry *dst;
148
149 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
150 saddr = x->coaddr;
151 daddr = prev_daddr;
152 }
153 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
154 saddr = prev_saddr;
155 daddr = x->coaddr;
156 }
157
158 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
159
160 if (!IS_ERR(dst)) {
161 if (prev_saddr != saddr)
162 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
163 if (prev_daddr != daddr)
164 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
165 }
166
167 return dst;
168 }
169
170 static inline unsigned long make_jiffies(long secs)
171 {
172 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
173 return MAX_SCHEDULE_TIMEOUT-1;
174 else
175 return secs*HZ;
176 }
177
178 static void xfrm_policy_timer(unsigned long data)
179 {
180 struct xfrm_policy *xp = (struct xfrm_policy *)data;
181 unsigned long now = get_seconds();
182 long next = LONG_MAX;
183 int warn = 0;
184 int dir;
185
186 read_lock(&xp->lock);
187
188 if (unlikely(xp->walk.dead))
189 goto out;
190
191 dir = xfrm_policy_id2dir(xp->index);
192
193 if (xp->lft.hard_add_expires_seconds) {
194 long tmo = xp->lft.hard_add_expires_seconds +
195 xp->curlft.add_time - now;
196 if (tmo <= 0)
197 goto expired;
198 if (tmo < next)
199 next = tmo;
200 }
201 if (xp->lft.hard_use_expires_seconds) {
202 long tmo = xp->lft.hard_use_expires_seconds +
203 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
204 if (tmo <= 0)
205 goto expired;
206 if (tmo < next)
207 next = tmo;
208 }
209 if (xp->lft.soft_add_expires_seconds) {
210 long tmo = xp->lft.soft_add_expires_seconds +
211 xp->curlft.add_time - now;
212 if (tmo <= 0) {
213 warn = 1;
214 tmo = XFRM_KM_TIMEOUT;
215 }
216 if (tmo < next)
217 next = tmo;
218 }
219 if (xp->lft.soft_use_expires_seconds) {
220 long tmo = xp->lft.soft_use_expires_seconds +
221 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
222 if (tmo <= 0) {
223 warn = 1;
224 tmo = XFRM_KM_TIMEOUT;
225 }
226 if (tmo < next)
227 next = tmo;
228 }
229
230 if (warn)
231 km_policy_expired(xp, dir, 0, 0);
232 if (next != LONG_MAX &&
233 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
234 xfrm_pol_hold(xp);
235
236 out:
237 read_unlock(&xp->lock);
238 xfrm_pol_put(xp);
239 return;
240
241 expired:
242 read_unlock(&xp->lock);
243 if (!xfrm_policy_delete(xp, dir))
244 km_policy_expired(xp, dir, 1, 0);
245 xfrm_pol_put(xp);
246 }
247
248 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
249 {
250 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
251
252 if (unlikely(pol->walk.dead))
253 flo = NULL;
254 else
255 xfrm_pol_hold(pol);
256
257 return flo;
258 }
259
260 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
261 {
262 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
263
264 return !pol->walk.dead;
265 }
266
267 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
268 {
269 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
270 }
271
272 static const struct flow_cache_ops xfrm_policy_fc_ops = {
273 .get = xfrm_policy_flo_get,
274 .check = xfrm_policy_flo_check,
275 .delete = xfrm_policy_flo_delete,
276 };
277
278 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
279 * SPD calls.
280 */
281
282 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
283 {
284 struct xfrm_policy *policy;
285
286 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
287
288 if (policy) {
289 write_pnet(&policy->xp_net, net);
290 INIT_LIST_HEAD(&policy->walk.all);
291 INIT_HLIST_NODE(&policy->bydst);
292 INIT_HLIST_NODE(&policy->byidx);
293 rwlock_init(&policy->lock);
294 atomic_set(&policy->refcnt, 1);
295 skb_queue_head_init(&policy->polq.hold_queue);
296 setup_timer(&policy->timer, xfrm_policy_timer,
297 (unsigned long)policy);
298 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
299 (unsigned long)policy);
300 policy->flo.ops = &xfrm_policy_fc_ops;
301 }
302 return policy;
303 }
304 EXPORT_SYMBOL(xfrm_policy_alloc);
305
306 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
307
308 void xfrm_policy_destroy(struct xfrm_policy *policy)
309 {
310 BUG_ON(!policy->walk.dead);
311
312 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
313 BUG();
314
315 security_xfrm_policy_free(policy->security);
316 kfree(policy);
317 }
318 EXPORT_SYMBOL(xfrm_policy_destroy);
319
320 /* Rule must be locked. Release descentant resources, announce
321 * entry dead. The rule must be unlinked from lists to the moment.
322 */
323
324 static void xfrm_policy_kill(struct xfrm_policy *policy)
325 {
326 policy->walk.dead = 1;
327
328 atomic_inc(&policy->genid);
329
330 if (del_timer(&policy->polq.hold_timer))
331 xfrm_pol_put(policy);
332 skb_queue_purge(&policy->polq.hold_queue);
333
334 if (del_timer(&policy->timer))
335 xfrm_pol_put(policy);
336
337 xfrm_pol_put(policy);
338 }
339
340 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
341
342 static inline unsigned int idx_hash(struct net *net, u32 index)
343 {
344 return __idx_hash(index, net->xfrm.policy_idx_hmask);
345 }
346
347 /* calculate policy hash thresholds */
348 static void __get_hash_thresh(struct net *net,
349 unsigned short family, int dir,
350 u8 *dbits, u8 *sbits)
351 {
352 switch (family) {
353 case AF_INET:
354 *dbits = net->xfrm.policy_bydst[dir].dbits4;
355 *sbits = net->xfrm.policy_bydst[dir].sbits4;
356 break;
357
358 case AF_INET6:
359 *dbits = net->xfrm.policy_bydst[dir].dbits6;
360 *sbits = net->xfrm.policy_bydst[dir].sbits6;
361 break;
362
363 default:
364 *dbits = 0;
365 *sbits = 0;
366 }
367 }
368
369 static struct hlist_head *policy_hash_bysel(struct net *net,
370 const struct xfrm_selector *sel,
371 unsigned short family, int dir)
372 {
373 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
374 unsigned int hash;
375 u8 dbits;
376 u8 sbits;
377
378 __get_hash_thresh(net, family, dir, &dbits, &sbits);
379 hash = __sel_hash(sel, family, hmask, dbits, sbits);
380
381 return (hash == hmask + 1 ?
382 &net->xfrm.policy_inexact[dir] :
383 net->xfrm.policy_bydst[dir].table + hash);
384 }
385
386 static struct hlist_head *policy_hash_direct(struct net *net,
387 const xfrm_address_t *daddr,
388 const xfrm_address_t *saddr,
389 unsigned short family, int dir)
390 {
391 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
392 unsigned int hash;
393 u8 dbits;
394 u8 sbits;
395
396 __get_hash_thresh(net, family, dir, &dbits, &sbits);
397 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
398
399 return net->xfrm.policy_bydst[dir].table + hash;
400 }
401
402 static void xfrm_dst_hash_transfer(struct net *net,
403 struct hlist_head *list,
404 struct hlist_head *ndsttable,
405 unsigned int nhashmask,
406 int dir)
407 {
408 struct hlist_node *tmp, *entry0 = NULL;
409 struct xfrm_policy *pol;
410 unsigned int h0 = 0;
411 u8 dbits;
412 u8 sbits;
413
414 redo:
415 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
416 unsigned int h;
417
418 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
419 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
420 pol->family, nhashmask, dbits, sbits);
421 if (!entry0) {
422 hlist_del(&pol->bydst);
423 hlist_add_head(&pol->bydst, ndsttable+h);
424 h0 = h;
425 } else {
426 if (h != h0)
427 continue;
428 hlist_del(&pol->bydst);
429 hlist_add_behind(&pol->bydst, entry0);
430 }
431 entry0 = &pol->bydst;
432 }
433 if (!hlist_empty(list)) {
434 entry0 = NULL;
435 goto redo;
436 }
437 }
438
439 static void xfrm_idx_hash_transfer(struct hlist_head *list,
440 struct hlist_head *nidxtable,
441 unsigned int nhashmask)
442 {
443 struct hlist_node *tmp;
444 struct xfrm_policy *pol;
445
446 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
447 unsigned int h;
448
449 h = __idx_hash(pol->index, nhashmask);
450 hlist_add_head(&pol->byidx, nidxtable+h);
451 }
452 }
453
454 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
455 {
456 return ((old_hmask + 1) << 1) - 1;
457 }
458
459 static void xfrm_bydst_resize(struct net *net, int dir)
460 {
461 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
462 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
463 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
464 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
465 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
466 int i;
467
468 if (!ndst)
469 return;
470
471 write_lock_bh(&net->xfrm.xfrm_policy_lock);
472
473 for (i = hmask; i >= 0; i--)
474 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
475
476 net->xfrm.policy_bydst[dir].table = ndst;
477 net->xfrm.policy_bydst[dir].hmask = nhashmask;
478
479 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
480
481 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
482 }
483
484 static void xfrm_byidx_resize(struct net *net, int total)
485 {
486 unsigned int hmask = net->xfrm.policy_idx_hmask;
487 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
488 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
489 struct hlist_head *oidx = net->xfrm.policy_byidx;
490 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
491 int i;
492
493 if (!nidx)
494 return;
495
496 write_lock_bh(&net->xfrm.xfrm_policy_lock);
497
498 for (i = hmask; i >= 0; i--)
499 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
500
501 net->xfrm.policy_byidx = nidx;
502 net->xfrm.policy_idx_hmask = nhashmask;
503
504 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
505
506 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
507 }
508
509 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
510 {
511 unsigned int cnt = net->xfrm.policy_count[dir];
512 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
513
514 if (total)
515 *total += cnt;
516
517 if ((hmask + 1) < xfrm_policy_hashmax &&
518 cnt > hmask)
519 return 1;
520
521 return 0;
522 }
523
524 static inline int xfrm_byidx_should_resize(struct net *net, int total)
525 {
526 unsigned int hmask = net->xfrm.policy_idx_hmask;
527
528 if ((hmask + 1) < xfrm_policy_hashmax &&
529 total > hmask)
530 return 1;
531
532 return 0;
533 }
534
535 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
536 {
537 read_lock_bh(&net->xfrm.xfrm_policy_lock);
538 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
539 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
540 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
541 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
542 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
543 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
544 si->spdhcnt = net->xfrm.policy_idx_hmask;
545 si->spdhmcnt = xfrm_policy_hashmax;
546 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
547 }
548 EXPORT_SYMBOL(xfrm_spd_getinfo);
549
550 static DEFINE_MUTEX(hash_resize_mutex);
551 static void xfrm_hash_resize(struct work_struct *work)
552 {
553 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
554 int dir, total;
555
556 mutex_lock(&hash_resize_mutex);
557
558 total = 0;
559 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
560 if (xfrm_bydst_should_resize(net, dir, &total))
561 xfrm_bydst_resize(net, dir);
562 }
563 if (xfrm_byidx_should_resize(net, total))
564 xfrm_byidx_resize(net, total);
565
566 mutex_unlock(&hash_resize_mutex);
567 }
568
569 static void xfrm_hash_rebuild(struct work_struct *work)
570 {
571 struct net *net = container_of(work, struct net,
572 xfrm.policy_hthresh.work);
573 unsigned int hmask;
574 struct xfrm_policy *pol;
575 struct xfrm_policy *policy;
576 struct hlist_head *chain;
577 struct hlist_head *odst;
578 struct hlist_node *newpos;
579 int i;
580 int dir;
581 unsigned seq;
582 u8 lbits4, rbits4, lbits6, rbits6;
583
584 mutex_lock(&hash_resize_mutex);
585
586 /* read selector prefixlen thresholds */
587 do {
588 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
589
590 lbits4 = net->xfrm.policy_hthresh.lbits4;
591 rbits4 = net->xfrm.policy_hthresh.rbits4;
592 lbits6 = net->xfrm.policy_hthresh.lbits6;
593 rbits6 = net->xfrm.policy_hthresh.rbits6;
594 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
595
596 write_lock_bh(&net->xfrm.xfrm_policy_lock);
597
598 /* reset the bydst and inexact table in all directions */
599 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
600 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
601 hmask = net->xfrm.policy_bydst[dir].hmask;
602 odst = net->xfrm.policy_bydst[dir].table;
603 for (i = hmask; i >= 0; i--)
604 INIT_HLIST_HEAD(odst + i);
605 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
606 /* dir out => dst = remote, src = local */
607 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
608 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
609 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
610 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
611 } else {
612 /* dir in/fwd => dst = local, src = remote */
613 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
614 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
615 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
616 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
617 }
618 }
619
620 /* re-insert all policies by order of creation */
621 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
622 newpos = NULL;
623 chain = policy_hash_bysel(net, &policy->selector,
624 policy->family,
625 xfrm_policy_id2dir(policy->index));
626 hlist_for_each_entry(pol, chain, bydst) {
627 if (policy->priority >= pol->priority)
628 newpos = &pol->bydst;
629 else
630 break;
631 }
632 if (newpos)
633 hlist_add_behind(&policy->bydst, newpos);
634 else
635 hlist_add_head(&policy->bydst, chain);
636 }
637
638 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
639
640 mutex_unlock(&hash_resize_mutex);
641 }
642
643 void xfrm_policy_hash_rebuild(struct net *net)
644 {
645 schedule_work(&net->xfrm.policy_hthresh.work);
646 }
647 EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
648
649 /* Generate new index... KAME seems to generate them ordered by cost
650 * of an absolute inpredictability of ordering of rules. This will not pass. */
651 static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
652 {
653 static u32 idx_generator;
654
655 for (;;) {
656 struct hlist_head *list;
657 struct xfrm_policy *p;
658 u32 idx;
659 int found;
660
661 if (!index) {
662 idx = (idx_generator | dir);
663 idx_generator += 8;
664 } else {
665 idx = index;
666 index = 0;
667 }
668
669 if (idx == 0)
670 idx = 8;
671 list = net->xfrm.policy_byidx + idx_hash(net, idx);
672 found = 0;
673 hlist_for_each_entry(p, list, byidx) {
674 if (p->index == idx) {
675 found = 1;
676 break;
677 }
678 }
679 if (!found)
680 return idx;
681 }
682 }
683
684 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
685 {
686 u32 *p1 = (u32 *) s1;
687 u32 *p2 = (u32 *) s2;
688 int len = sizeof(struct xfrm_selector) / sizeof(u32);
689 int i;
690
691 for (i = 0; i < len; i++) {
692 if (p1[i] != p2[i])
693 return 1;
694 }
695
696 return 0;
697 }
698
699 static void xfrm_policy_requeue(struct xfrm_policy *old,
700 struct xfrm_policy *new)
701 {
702 struct xfrm_policy_queue *pq = &old->polq;
703 struct sk_buff_head list;
704
705 if (skb_queue_empty(&pq->hold_queue))
706 return;
707
708 __skb_queue_head_init(&list);
709
710 spin_lock_bh(&pq->hold_queue.lock);
711 skb_queue_splice_init(&pq->hold_queue, &list);
712 if (del_timer(&pq->hold_timer))
713 xfrm_pol_put(old);
714 spin_unlock_bh(&pq->hold_queue.lock);
715
716 pq = &new->polq;
717
718 spin_lock_bh(&pq->hold_queue.lock);
719 skb_queue_splice(&list, &pq->hold_queue);
720 pq->timeout = XFRM_QUEUE_TMO_MIN;
721 if (!mod_timer(&pq->hold_timer, jiffies))
722 xfrm_pol_hold(new);
723 spin_unlock_bh(&pq->hold_queue.lock);
724 }
725
726 static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
727 struct xfrm_policy *pol)
728 {
729 u32 mark = policy->mark.v & policy->mark.m;
730
731 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
732 return true;
733
734 if ((mark & pol->mark.m) == pol->mark.v &&
735 policy->priority == pol->priority)
736 return true;
737
738 return false;
739 }
740
741 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
742 {
743 struct net *net = xp_net(policy);
744 struct xfrm_policy *pol;
745 struct xfrm_policy *delpol;
746 struct hlist_head *chain;
747 struct hlist_node *newpos;
748
749 write_lock_bh(&net->xfrm.xfrm_policy_lock);
750 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
751 delpol = NULL;
752 newpos = NULL;
753 hlist_for_each_entry(pol, chain, bydst) {
754 if (pol->type == policy->type &&
755 !selector_cmp(&pol->selector, &policy->selector) &&
756 xfrm_policy_mark_match(policy, pol) &&
757 xfrm_sec_ctx_match(pol->security, policy->security) &&
758 !WARN_ON(delpol)) {
759 if (excl) {
760 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
761 return -EEXIST;
762 }
763 delpol = pol;
764 if (policy->priority > pol->priority)
765 continue;
766 } else if (policy->priority >= pol->priority) {
767 newpos = &pol->bydst;
768 continue;
769 }
770 if (delpol)
771 break;
772 }
773 if (newpos)
774 hlist_add_behind(&policy->bydst, newpos);
775 else
776 hlist_add_head(&policy->bydst, chain);
777 __xfrm_policy_link(policy, dir);
778 atomic_inc(&net->xfrm.flow_cache_genid);
779
780 /* After previous checking, family can either be AF_INET or AF_INET6 */
781 if (policy->family == AF_INET)
782 rt_genid_bump_ipv4(net);
783 else
784 rt_genid_bump_ipv6(net);
785
786 if (delpol) {
787 xfrm_policy_requeue(delpol, policy);
788 __xfrm_policy_unlink(delpol, dir);
789 }
790 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
791 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
792 policy->curlft.add_time = get_seconds();
793 policy->curlft.use_time = 0;
794 if (!mod_timer(&policy->timer, jiffies + HZ))
795 xfrm_pol_hold(policy);
796 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
797
798 if (delpol)
799 xfrm_policy_kill(delpol);
800 else if (xfrm_bydst_should_resize(net, dir, NULL))
801 schedule_work(&net->xfrm.policy_hash_work);
802
803 return 0;
804 }
805 EXPORT_SYMBOL(xfrm_policy_insert);
806
807 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
808 int dir, struct xfrm_selector *sel,
809 struct xfrm_sec_ctx *ctx, int delete,
810 int *err)
811 {
812 struct xfrm_policy *pol, *ret;
813 struct hlist_head *chain;
814
815 *err = 0;
816 write_lock_bh(&net->xfrm.xfrm_policy_lock);
817 chain = policy_hash_bysel(net, sel, sel->family, dir);
818 ret = NULL;
819 hlist_for_each_entry(pol, chain, bydst) {
820 if (pol->type == type &&
821 (mark & pol->mark.m) == pol->mark.v &&
822 !selector_cmp(sel, &pol->selector) &&
823 xfrm_sec_ctx_match(ctx, pol->security)) {
824 xfrm_pol_hold(pol);
825 if (delete) {
826 *err = security_xfrm_policy_delete(
827 pol->security);
828 if (*err) {
829 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
830 return pol;
831 }
832 __xfrm_policy_unlink(pol, dir);
833 }
834 ret = pol;
835 break;
836 }
837 }
838 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
839
840 if (ret && delete)
841 xfrm_policy_kill(ret);
842 return ret;
843 }
844 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
845
846 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
847 int dir, u32 id, int delete, int *err)
848 {
849 struct xfrm_policy *pol, *ret;
850 struct hlist_head *chain;
851
852 *err = -ENOENT;
853 if (xfrm_policy_id2dir(id) != dir)
854 return NULL;
855
856 *err = 0;
857 write_lock_bh(&net->xfrm.xfrm_policy_lock);
858 chain = net->xfrm.policy_byidx + idx_hash(net, id);
859 ret = NULL;
860 hlist_for_each_entry(pol, chain, byidx) {
861 if (pol->type == type && pol->index == id &&
862 (mark & pol->mark.m) == pol->mark.v) {
863 xfrm_pol_hold(pol);
864 if (delete) {
865 *err = security_xfrm_policy_delete(
866 pol->security);
867 if (*err) {
868 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
869 return pol;
870 }
871 __xfrm_policy_unlink(pol, dir);
872 }
873 ret = pol;
874 break;
875 }
876 }
877 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
878
879 if (ret && delete)
880 xfrm_policy_kill(ret);
881 return ret;
882 }
883 EXPORT_SYMBOL(xfrm_policy_byid);
884
885 #ifdef CONFIG_SECURITY_NETWORK_XFRM
886 static inline int
887 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
888 {
889 int dir, err = 0;
890
891 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
892 struct xfrm_policy *pol;
893 int i;
894
895 hlist_for_each_entry(pol,
896 &net->xfrm.policy_inexact[dir], bydst) {
897 if (pol->type != type)
898 continue;
899 err = security_xfrm_policy_delete(pol->security);
900 if (err) {
901 xfrm_audit_policy_delete(pol, 0, task_valid);
902 return err;
903 }
904 }
905 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
906 hlist_for_each_entry(pol,
907 net->xfrm.policy_bydst[dir].table + i,
908 bydst) {
909 if (pol->type != type)
910 continue;
911 err = security_xfrm_policy_delete(
912 pol->security);
913 if (err) {
914 xfrm_audit_policy_delete(pol, 0,
915 task_valid);
916 return err;
917 }
918 }
919 }
920 }
921 return err;
922 }
923 #else
924 static inline int
925 xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
926 {
927 return 0;
928 }
929 #endif
930
931 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
932 {
933 int dir, err = 0, cnt = 0;
934
935 write_lock_bh(&net->xfrm.xfrm_policy_lock);
936
937 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
938 if (err)
939 goto out;
940
941 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
942 struct xfrm_policy *pol;
943 int i;
944
945 again1:
946 hlist_for_each_entry(pol,
947 &net->xfrm.policy_inexact[dir], bydst) {
948 if (pol->type != type)
949 continue;
950 __xfrm_policy_unlink(pol, dir);
951 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
952 cnt++;
953
954 xfrm_audit_policy_delete(pol, 1, task_valid);
955
956 xfrm_policy_kill(pol);
957
958 write_lock_bh(&net->xfrm.xfrm_policy_lock);
959 goto again1;
960 }
961
962 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
963 again2:
964 hlist_for_each_entry(pol,
965 net->xfrm.policy_bydst[dir].table + i,
966 bydst) {
967 if (pol->type != type)
968 continue;
969 __xfrm_policy_unlink(pol, dir);
970 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
971 cnt++;
972
973 xfrm_audit_policy_delete(pol, 1, task_valid);
974 xfrm_policy_kill(pol);
975
976 write_lock_bh(&net->xfrm.xfrm_policy_lock);
977 goto again2;
978 }
979 }
980
981 }
982 if (!cnt)
983 err = -ESRCH;
984 out:
985 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
986 return err;
987 }
988 EXPORT_SYMBOL(xfrm_policy_flush);
989
990 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
991 int (*func)(struct xfrm_policy *, int, int, void*),
992 void *data)
993 {
994 struct xfrm_policy *pol;
995 struct xfrm_policy_walk_entry *x;
996 int error = 0;
997
998 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
999 walk->type != XFRM_POLICY_TYPE_ANY)
1000 return -EINVAL;
1001
1002 if (list_empty(&walk->walk.all) && walk->seq != 0)
1003 return 0;
1004
1005 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1006 if (list_empty(&walk->walk.all))
1007 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
1008 else
1009 x = list_first_entry(&walk->walk.all,
1010 struct xfrm_policy_walk_entry, all);
1011
1012 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
1013 if (x->dead)
1014 continue;
1015 pol = container_of(x, struct xfrm_policy, walk);
1016 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1017 walk->type != pol->type)
1018 continue;
1019 error = func(pol, xfrm_policy_id2dir(pol->index),
1020 walk->seq, data);
1021 if (error) {
1022 list_move_tail(&walk->walk.all, &x->all);
1023 goto out;
1024 }
1025 walk->seq++;
1026 }
1027 if (walk->seq == 0) {
1028 error = -ENOENT;
1029 goto out;
1030 }
1031 list_del_init(&walk->walk.all);
1032 out:
1033 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1034 return error;
1035 }
1036 EXPORT_SYMBOL(xfrm_policy_walk);
1037
1038 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1039 {
1040 INIT_LIST_HEAD(&walk->walk.all);
1041 walk->walk.dead = 1;
1042 walk->type = type;
1043 walk->seq = 0;
1044 }
1045 EXPORT_SYMBOL(xfrm_policy_walk_init);
1046
1047 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
1048 {
1049 if (list_empty(&walk->walk.all))
1050 return;
1051
1052 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
1053 list_del(&walk->walk.all);
1054 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1055 }
1056 EXPORT_SYMBOL(xfrm_policy_walk_done);
1057
1058 /*
1059 * Find policy to apply to this flow.
1060 *
1061 * Returns 0 if policy found, else an -errno.
1062 */
1063 static int xfrm_policy_match(const struct xfrm_policy *pol,
1064 const struct flowi *fl,
1065 u8 type, u16 family, int dir)
1066 {
1067 const struct xfrm_selector *sel = &pol->selector;
1068 int ret = -ESRCH;
1069 bool match;
1070
1071 if (pol->family != family ||
1072 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
1073 pol->type != type)
1074 return ret;
1075
1076 match = xfrm_selector_match(sel, fl, family);
1077 if (match)
1078 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
1079 dir);
1080
1081 return ret;
1082 }
1083
1084 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
1085 const struct flowi *fl,
1086 u16 family, u8 dir)
1087 {
1088 int err;
1089 struct xfrm_policy *pol, *ret;
1090 const xfrm_address_t *daddr, *saddr;
1091 struct hlist_head *chain;
1092 u32 priority = ~0U;
1093
1094 daddr = xfrm_flowi_daddr(fl, family);
1095 saddr = xfrm_flowi_saddr(fl, family);
1096 if (unlikely(!daddr || !saddr))
1097 return NULL;
1098
1099 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1100 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1101 ret = NULL;
1102 hlist_for_each_entry(pol, chain, bydst) {
1103 err = xfrm_policy_match(pol, fl, type, family, dir);
1104 if (err) {
1105 if (err == -ESRCH)
1106 continue;
1107 else {
1108 ret = ERR_PTR(err);
1109 goto fail;
1110 }
1111 } else {
1112 ret = pol;
1113 priority = ret->priority;
1114 break;
1115 }
1116 }
1117 chain = &net->xfrm.policy_inexact[dir];
1118 hlist_for_each_entry(pol, chain, bydst) {
1119 if ((pol->priority >= priority) && ret)
1120 break;
1121
1122 err = xfrm_policy_match(pol, fl, type, family, dir);
1123 if (err) {
1124 if (err == -ESRCH)
1125 continue;
1126 else {
1127 ret = ERR_PTR(err);
1128 goto fail;
1129 }
1130 } else {
1131 ret = pol;
1132 break;
1133 }
1134 }
1135
1136 xfrm_pol_hold(ret);
1137 fail:
1138 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1139
1140 return ret;
1141 }
1142
1143 static struct xfrm_policy *
1144 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
1145 {
1146 #ifdef CONFIG_XFRM_SUB_POLICY
1147 struct xfrm_policy *pol;
1148
1149 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1150 if (pol != NULL)
1151 return pol;
1152 #endif
1153 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1154 }
1155
1156 static int flow_to_policy_dir(int dir)
1157 {
1158 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1159 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1160 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1161 return dir;
1162
1163 switch (dir) {
1164 default:
1165 case FLOW_DIR_IN:
1166 return XFRM_POLICY_IN;
1167 case FLOW_DIR_OUT:
1168 return XFRM_POLICY_OUT;
1169 case FLOW_DIR_FWD:
1170 return XFRM_POLICY_FWD;
1171 }
1172 }
1173
1174 static struct flow_cache_object *
1175 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
1176 u8 dir, struct flow_cache_object *old_obj, void *ctx)
1177 {
1178 struct xfrm_policy *pol;
1179
1180 if (old_obj)
1181 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
1182
1183 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
1184 if (IS_ERR_OR_NULL(pol))
1185 return ERR_CAST(pol);
1186
1187 /* Resolver returns two references:
1188 * one for cache and one for caller of flow_cache_lookup() */
1189 xfrm_pol_hold(pol);
1190
1191 return &pol->flo;
1192 }
1193
1194 static inline int policy_to_flow_dir(int dir)
1195 {
1196 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1197 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1198 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1199 return dir;
1200 switch (dir) {
1201 default:
1202 case XFRM_POLICY_IN:
1203 return FLOW_DIR_IN;
1204 case XFRM_POLICY_OUT:
1205 return FLOW_DIR_OUT;
1206 case XFRM_POLICY_FWD:
1207 return FLOW_DIR_FWD;
1208 }
1209 }
1210
1211 static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
1212 const struct flowi *fl)
1213 {
1214 struct xfrm_policy *pol;
1215 struct net *net = sock_net(sk);
1216
1217 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1218 if ((pol = sk->sk_policy[dir]) != NULL) {
1219 bool match = xfrm_selector_match(&pol->selector, fl,
1220 sk->sk_family);
1221 int err = 0;
1222
1223 if (match) {
1224 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1225 pol = NULL;
1226 goto out;
1227 }
1228 err = security_xfrm_policy_lookup(pol->security,
1229 fl->flowi_secid,
1230 policy_to_flow_dir(dir));
1231 if (!err)
1232 xfrm_pol_hold(pol);
1233 else if (err == -ESRCH)
1234 pol = NULL;
1235 else
1236 pol = ERR_PTR(err);
1237 } else
1238 pol = NULL;
1239 }
1240 out:
1241 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1242 return pol;
1243 }
1244
1245 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1246 {
1247 struct net *net = xp_net(pol);
1248
1249 list_add(&pol->walk.all, &net->xfrm.policy_all);
1250 net->xfrm.policy_count[dir]++;
1251 xfrm_pol_hold(pol);
1252 }
1253
1254 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1255 int dir)
1256 {
1257 struct net *net = xp_net(pol);
1258
1259 if (list_empty(&pol->walk.all))
1260 return NULL;
1261
1262 /* Socket policies are not hashed. */
1263 if (!hlist_unhashed(&pol->bydst)) {
1264 hlist_del(&pol->bydst);
1265 hlist_del(&pol->byidx);
1266 }
1267
1268 list_del_init(&pol->walk.all);
1269 net->xfrm.policy_count[dir]--;
1270
1271 return pol;
1272 }
1273
1274 static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1275 {
1276 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1277 }
1278
1279 static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1280 {
1281 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1282 }
1283
1284 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1285 {
1286 struct net *net = xp_net(pol);
1287
1288 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1289 pol = __xfrm_policy_unlink(pol, dir);
1290 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1291 if (pol) {
1292 xfrm_policy_kill(pol);
1293 return 0;
1294 }
1295 return -ENOENT;
1296 }
1297 EXPORT_SYMBOL(xfrm_policy_delete);
1298
1299 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1300 {
1301 struct net *net = xp_net(pol);
1302 struct xfrm_policy *old_pol;
1303
1304 #ifdef CONFIG_XFRM_SUB_POLICY
1305 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1306 return -EINVAL;
1307 #endif
1308
1309 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1310 old_pol = sk->sk_policy[dir];
1311 sk->sk_policy[dir] = pol;
1312 if (pol) {
1313 pol->curlft.add_time = get_seconds();
1314 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1315 xfrm_sk_policy_link(pol, dir);
1316 }
1317 if (old_pol) {
1318 if (pol)
1319 xfrm_policy_requeue(old_pol, pol);
1320
1321 /* Unlinking succeeds always. This is the only function
1322 * allowed to delete or replace socket policy.
1323 */
1324 xfrm_sk_policy_unlink(old_pol, dir);
1325 }
1326 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1327
1328 if (old_pol) {
1329 xfrm_policy_kill(old_pol);
1330 }
1331 return 0;
1332 }
1333
1334 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1335 {
1336 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1337 struct net *net = xp_net(old);
1338
1339 if (newp) {
1340 newp->selector = old->selector;
1341 if (security_xfrm_policy_clone(old->security,
1342 &newp->security)) {
1343 kfree(newp);
1344 return NULL; /* ENOMEM */
1345 }
1346 newp->lft = old->lft;
1347 newp->curlft = old->curlft;
1348 newp->mark = old->mark;
1349 newp->action = old->action;
1350 newp->flags = old->flags;
1351 newp->xfrm_nr = old->xfrm_nr;
1352 newp->index = old->index;
1353 newp->type = old->type;
1354 memcpy(newp->xfrm_vec, old->xfrm_vec,
1355 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1356 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1357 xfrm_sk_policy_link(newp, dir);
1358 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1359 xfrm_pol_put(newp);
1360 }
1361 return newp;
1362 }
1363
1364 int __xfrm_sk_clone_policy(struct sock *sk)
1365 {
1366 struct xfrm_policy *p0 = sk->sk_policy[0],
1367 *p1 = sk->sk_policy[1];
1368
1369 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1370 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1371 return -ENOMEM;
1372 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1373 return -ENOMEM;
1374 return 0;
1375 }
1376
1377 static int
1378 xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1379 xfrm_address_t *remote, unsigned short family)
1380 {
1381 int err;
1382 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1383
1384 if (unlikely(afinfo == NULL))
1385 return -EINVAL;
1386 err = afinfo->get_saddr(net, oif, local, remote);
1387 xfrm_policy_put_afinfo(afinfo);
1388 return err;
1389 }
1390
1391 /* Resolve list of templates for the flow, given policy. */
1392
1393 static int
1394 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1395 struct xfrm_state **xfrm, unsigned short family)
1396 {
1397 struct net *net = xp_net(policy);
1398 int nx;
1399 int i, error;
1400 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1401 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1402 xfrm_address_t tmp;
1403
1404 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1405 struct xfrm_state *x;
1406 xfrm_address_t *remote = daddr;
1407 xfrm_address_t *local = saddr;
1408 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1409
1410 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1411 tmpl->mode == XFRM_MODE_BEET) {
1412 remote = &tmpl->id.daddr;
1413 local = &tmpl->saddr;
1414 if (xfrm_addr_any(local, tmpl->encap_family)) {
1415 error = xfrm_get_saddr(net, fl->flowi_oif,
1416 &tmp, remote,
1417 tmpl->encap_family);
1418 if (error)
1419 goto fail;
1420 local = &tmp;
1421 }
1422 }
1423
1424 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1425
1426 if (x && x->km.state == XFRM_STATE_VALID) {
1427 xfrm[nx++] = x;
1428 daddr = remote;
1429 saddr = local;
1430 continue;
1431 }
1432 if (x) {
1433 error = (x->km.state == XFRM_STATE_ERROR ?
1434 -EINVAL : -EAGAIN);
1435 xfrm_state_put(x);
1436 } else if (error == -ESRCH) {
1437 error = -EAGAIN;
1438 }
1439
1440 if (!tmpl->optional)
1441 goto fail;
1442 }
1443 return nx;
1444
1445 fail:
1446 for (nx--; nx >= 0; nx--)
1447 xfrm_state_put(xfrm[nx]);
1448 return error;
1449 }
1450
1451 static int
1452 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1453 struct xfrm_state **xfrm, unsigned short family)
1454 {
1455 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1456 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1457 int cnx = 0;
1458 int error;
1459 int ret;
1460 int i;
1461
1462 for (i = 0; i < npols; i++) {
1463 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1464 error = -ENOBUFS;
1465 goto fail;
1466 }
1467
1468 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1469 if (ret < 0) {
1470 error = ret;
1471 goto fail;
1472 } else
1473 cnx += ret;
1474 }
1475
1476 /* found states are sorted for outbound processing */
1477 if (npols > 1)
1478 xfrm_state_sort(xfrm, tpp, cnx, family);
1479
1480 return cnx;
1481
1482 fail:
1483 for (cnx--; cnx >= 0; cnx--)
1484 xfrm_state_put(tpp[cnx]);
1485 return error;
1486
1487 }
1488
1489 /* Check that the bundle accepts the flow and its components are
1490 * still valid.
1491 */
1492
1493 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1494 {
1495 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1496 int tos;
1497
1498 if (!afinfo)
1499 return -EINVAL;
1500
1501 tos = afinfo->get_tos(fl);
1502
1503 xfrm_policy_put_afinfo(afinfo);
1504
1505 return tos;
1506 }
1507
1508 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1509 {
1510 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1511 struct dst_entry *dst = &xdst->u.dst;
1512
1513 if (xdst->route == NULL) {
1514 /* Dummy bundle - if it has xfrms we were not
1515 * able to build bundle as template resolution failed.
1516 * It means we need to try again resolving. */
1517 if (xdst->num_xfrms > 0)
1518 return NULL;
1519 } else if (dst->flags & DST_XFRM_QUEUE) {
1520 return NULL;
1521 } else {
1522 /* Real bundle */
1523 if (stale_bundle(dst))
1524 return NULL;
1525 }
1526
1527 dst_hold(dst);
1528 return flo;
1529 }
1530
1531 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1532 {
1533 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1534 struct dst_entry *dst = &xdst->u.dst;
1535
1536 if (!xdst->route)
1537 return 0;
1538 if (stale_bundle(dst))
1539 return 0;
1540
1541 return 1;
1542 }
1543
1544 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1545 {
1546 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1547 struct dst_entry *dst = &xdst->u.dst;
1548
1549 dst_free(dst);
1550 }
1551
1552 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1553 .get = xfrm_bundle_flo_get,
1554 .check = xfrm_bundle_flo_check,
1555 .delete = xfrm_bundle_flo_delete,
1556 };
1557
1558 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1559 {
1560 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1561 struct dst_ops *dst_ops;
1562 struct xfrm_dst *xdst;
1563
1564 if (!afinfo)
1565 return ERR_PTR(-EINVAL);
1566
1567 switch (family) {
1568 case AF_INET:
1569 dst_ops = &net->xfrm.xfrm4_dst_ops;
1570 break;
1571 #if IS_ENABLED(CONFIG_IPV6)
1572 case AF_INET6:
1573 dst_ops = &net->xfrm.xfrm6_dst_ops;
1574 break;
1575 #endif
1576 default:
1577 BUG();
1578 }
1579 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1580
1581 if (likely(xdst)) {
1582 struct dst_entry *dst = &xdst->u.dst;
1583
1584 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1585 xdst->flo.ops = &xfrm_bundle_fc_ops;
1586 } else
1587 xdst = ERR_PTR(-ENOBUFS);
1588
1589 xfrm_policy_put_afinfo(afinfo);
1590
1591 return xdst;
1592 }
1593
1594 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1595 int nfheader_len)
1596 {
1597 struct xfrm_policy_afinfo *afinfo =
1598 xfrm_policy_get_afinfo(dst->ops->family);
1599 int err;
1600
1601 if (!afinfo)
1602 return -EINVAL;
1603
1604 err = afinfo->init_path(path, dst, nfheader_len);
1605
1606 xfrm_policy_put_afinfo(afinfo);
1607
1608 return err;
1609 }
1610
1611 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1612 const struct flowi *fl)
1613 {
1614 struct xfrm_policy_afinfo *afinfo =
1615 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1616 int err;
1617
1618 if (!afinfo)
1619 return -EINVAL;
1620
1621 err = afinfo->fill_dst(xdst, dev, fl);
1622
1623 xfrm_policy_put_afinfo(afinfo);
1624
1625 return err;
1626 }
1627
1628
1629 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1630 * all the metrics... Shortly, bundle a bundle.
1631 */
1632
1633 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1634 struct xfrm_state **xfrm, int nx,
1635 const struct flowi *fl,
1636 struct dst_entry *dst)
1637 {
1638 struct net *net = xp_net(policy);
1639 unsigned long now = jiffies;
1640 struct net_device *dev;
1641 struct xfrm_mode *inner_mode;
1642 struct dst_entry *dst_prev = NULL;
1643 struct dst_entry *dst0 = NULL;
1644 int i = 0;
1645 int err;
1646 int header_len = 0;
1647 int nfheader_len = 0;
1648 int trailer_len = 0;
1649 int tos;
1650 int family = policy->selector.family;
1651 xfrm_address_t saddr, daddr;
1652
1653 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1654
1655 tos = xfrm_get_tos(fl, family);
1656 err = tos;
1657 if (tos < 0)
1658 goto put_states;
1659
1660 dst_hold(dst);
1661
1662 for (; i < nx; i++) {
1663 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1664 struct dst_entry *dst1 = &xdst->u.dst;
1665
1666 err = PTR_ERR(xdst);
1667 if (IS_ERR(xdst)) {
1668 dst_release(dst);
1669 goto put_states;
1670 }
1671
1672 if (xfrm[i]->sel.family == AF_UNSPEC) {
1673 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1674 xfrm_af2proto(family));
1675 if (!inner_mode) {
1676 err = -EAFNOSUPPORT;
1677 dst_release(dst);
1678 goto put_states;
1679 }
1680 } else
1681 inner_mode = xfrm[i]->inner_mode;
1682
1683 if (!dst_prev)
1684 dst0 = dst1;
1685 else {
1686 dst_prev->child = dst_clone(dst1);
1687 dst1->flags |= DST_NOHASH;
1688 }
1689
1690 xdst->route = dst;
1691 dst_copy_metrics(dst1, dst);
1692
1693 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1694 family = xfrm[i]->props.family;
1695 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1696 &saddr, &daddr, family);
1697 err = PTR_ERR(dst);
1698 if (IS_ERR(dst))
1699 goto put_states;
1700 } else
1701 dst_hold(dst);
1702
1703 dst1->xfrm = xfrm[i];
1704 xdst->xfrm_genid = xfrm[i]->genid;
1705
1706 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1707 dst1->flags |= DST_HOST;
1708 dst1->lastuse = now;
1709
1710 dst1->input = dst_discard;
1711 dst1->output = inner_mode->afinfo->output;
1712
1713 dst1->next = dst_prev;
1714 dst_prev = dst1;
1715
1716 header_len += xfrm[i]->props.header_len;
1717 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1718 nfheader_len += xfrm[i]->props.header_len;
1719 trailer_len += xfrm[i]->props.trailer_len;
1720 }
1721
1722 dst_prev->child = dst;
1723 dst0->path = dst;
1724
1725 err = -ENODEV;
1726 dev = dst->dev;
1727 if (!dev)
1728 goto free_dst;
1729
1730 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1731 xfrm_init_pmtu(dst_prev);
1732
1733 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1734 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1735
1736 err = xfrm_fill_dst(xdst, dev, fl);
1737 if (err)
1738 goto free_dst;
1739
1740 dst_prev->header_len = header_len;
1741 dst_prev->trailer_len = trailer_len;
1742 header_len -= xdst->u.dst.xfrm->props.header_len;
1743 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1744 }
1745
1746 out:
1747 return dst0;
1748
1749 put_states:
1750 for (; i < nx; i++)
1751 xfrm_state_put(xfrm[i]);
1752 free_dst:
1753 if (dst0)
1754 dst_free(dst0);
1755 dst0 = ERR_PTR(err);
1756 goto out;
1757 }
1758
1759 #ifdef CONFIG_XFRM_SUB_POLICY
1760 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
1761 {
1762 if (!*target) {
1763 *target = kmalloc(size, GFP_ATOMIC);
1764 if (!*target)
1765 return -ENOMEM;
1766 }
1767
1768 memcpy(*target, src, size);
1769 return 0;
1770 }
1771 #endif
1772
1773 static int xfrm_dst_update_parent(struct dst_entry *dst,
1774 const struct xfrm_selector *sel)
1775 {
1776 #ifdef CONFIG_XFRM_SUB_POLICY
1777 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1778 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1779 sel, sizeof(*sel));
1780 #else
1781 return 0;
1782 #endif
1783 }
1784
1785 static int xfrm_dst_update_origin(struct dst_entry *dst,
1786 const struct flowi *fl)
1787 {
1788 #ifdef CONFIG_XFRM_SUB_POLICY
1789 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1790 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1791 #else
1792 return 0;
1793 #endif
1794 }
1795
1796 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1797 struct xfrm_policy **pols,
1798 int *num_pols, int *num_xfrms)
1799 {
1800 int i;
1801
1802 if (*num_pols == 0 || !pols[0]) {
1803 *num_pols = 0;
1804 *num_xfrms = 0;
1805 return 0;
1806 }
1807 if (IS_ERR(pols[0]))
1808 return PTR_ERR(pols[0]);
1809
1810 *num_xfrms = pols[0]->xfrm_nr;
1811
1812 #ifdef CONFIG_XFRM_SUB_POLICY
1813 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1814 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1815 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1816 XFRM_POLICY_TYPE_MAIN,
1817 fl, family,
1818 XFRM_POLICY_OUT);
1819 if (pols[1]) {
1820 if (IS_ERR(pols[1])) {
1821 xfrm_pols_put(pols, *num_pols);
1822 return PTR_ERR(pols[1]);
1823 }
1824 (*num_pols)++;
1825 (*num_xfrms) += pols[1]->xfrm_nr;
1826 }
1827 }
1828 #endif
1829 for (i = 0; i < *num_pols; i++) {
1830 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1831 *num_xfrms = -1;
1832 break;
1833 }
1834 }
1835
1836 return 0;
1837
1838 }
1839
1840 static struct xfrm_dst *
1841 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1842 const struct flowi *fl, u16 family,
1843 struct dst_entry *dst_orig)
1844 {
1845 struct net *net = xp_net(pols[0]);
1846 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1847 struct dst_entry *dst;
1848 struct xfrm_dst *xdst;
1849 int err;
1850
1851 /* Try to instantiate a bundle */
1852 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1853 if (err <= 0) {
1854 if (err != 0 && err != -EAGAIN)
1855 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1856 return ERR_PTR(err);
1857 }
1858
1859 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1860 if (IS_ERR(dst)) {
1861 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1862 return ERR_CAST(dst);
1863 }
1864
1865 xdst = (struct xfrm_dst *)dst;
1866 xdst->num_xfrms = err;
1867 if (num_pols > 1)
1868 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1869 else
1870 err = xfrm_dst_update_origin(dst, fl);
1871 if (unlikely(err)) {
1872 dst_free(dst);
1873 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1874 return ERR_PTR(err);
1875 }
1876
1877 xdst->num_pols = num_pols;
1878 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
1879 xdst->policy_genid = atomic_read(&pols[0]->genid);
1880
1881 return xdst;
1882 }
1883
1884 static void xfrm_policy_queue_process(unsigned long arg)
1885 {
1886 struct sk_buff *skb;
1887 struct sock *sk;
1888 struct dst_entry *dst;
1889 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1890 struct net *net = xp_net(pol);
1891 struct xfrm_policy_queue *pq = &pol->polq;
1892 struct flowi fl;
1893 struct sk_buff_head list;
1894
1895 spin_lock(&pq->hold_queue.lock);
1896 skb = skb_peek(&pq->hold_queue);
1897 if (!skb) {
1898 spin_unlock(&pq->hold_queue.lock);
1899 goto out;
1900 }
1901 dst = skb_dst(skb);
1902 sk = skb->sk;
1903 xfrm_decode_session(skb, &fl, dst->ops->family);
1904 spin_unlock(&pq->hold_queue.lock);
1905
1906 dst_hold(dst->path);
1907 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
1908 if (IS_ERR(dst))
1909 goto purge_queue;
1910
1911 if (dst->flags & DST_XFRM_QUEUE) {
1912 dst_release(dst);
1913
1914 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1915 goto purge_queue;
1916
1917 pq->timeout = pq->timeout << 1;
1918 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1919 xfrm_pol_hold(pol);
1920 goto out;
1921 }
1922
1923 dst_release(dst);
1924
1925 __skb_queue_head_init(&list);
1926
1927 spin_lock(&pq->hold_queue.lock);
1928 pq->timeout = 0;
1929 skb_queue_splice_init(&pq->hold_queue, &list);
1930 spin_unlock(&pq->hold_queue.lock);
1931
1932 while (!skb_queue_empty(&list)) {
1933 skb = __skb_dequeue(&list);
1934
1935 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1936 dst_hold(skb_dst(skb)->path);
1937 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
1938 if (IS_ERR(dst)) {
1939 kfree_skb(skb);
1940 continue;
1941 }
1942
1943 nf_reset(skb);
1944 skb_dst_drop(skb);
1945 skb_dst_set(skb, dst);
1946
1947 dst_output(net, skb->sk, skb);
1948 }
1949
1950 out:
1951 xfrm_pol_put(pol);
1952 return;
1953
1954 purge_queue:
1955 pq->timeout = 0;
1956 skb_queue_purge(&pq->hold_queue);
1957 xfrm_pol_put(pol);
1958 }
1959
1960 static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
1961 {
1962 unsigned long sched_next;
1963 struct dst_entry *dst = skb_dst(skb);
1964 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1965 struct xfrm_policy *pol = xdst->pols[0];
1966 struct xfrm_policy_queue *pq = &pol->polq;
1967
1968 if (unlikely(skb_fclone_busy(sk, skb))) {
1969 kfree_skb(skb);
1970 return 0;
1971 }
1972
1973 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1974 kfree_skb(skb);
1975 return -EAGAIN;
1976 }
1977
1978 skb_dst_force(skb);
1979
1980 spin_lock_bh(&pq->hold_queue.lock);
1981
1982 if (!pq->timeout)
1983 pq->timeout = XFRM_QUEUE_TMO_MIN;
1984
1985 sched_next = jiffies + pq->timeout;
1986
1987 if (del_timer(&pq->hold_timer)) {
1988 if (time_before(pq->hold_timer.expires, sched_next))
1989 sched_next = pq->hold_timer.expires;
1990 xfrm_pol_put(pol);
1991 }
1992
1993 __skb_queue_tail(&pq->hold_queue, skb);
1994 if (!mod_timer(&pq->hold_timer, sched_next))
1995 xfrm_pol_hold(pol);
1996
1997 spin_unlock_bh(&pq->hold_queue.lock);
1998
1999 return 0;
2000 }
2001
2002 static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
2003 struct xfrm_flo *xflo,
2004 const struct flowi *fl,
2005 int num_xfrms,
2006 u16 family)
2007 {
2008 int err;
2009 struct net_device *dev;
2010 struct dst_entry *dst;
2011 struct dst_entry *dst1;
2012 struct xfrm_dst *xdst;
2013
2014 xdst = xfrm_alloc_dst(net, family);
2015 if (IS_ERR(xdst))
2016 return xdst;
2017
2018 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2019 net->xfrm.sysctl_larval_drop ||
2020 num_xfrms <= 0)
2021 return xdst;
2022
2023 dst = xflo->dst_orig;
2024 dst1 = &xdst->u.dst;
2025 dst_hold(dst);
2026 xdst->route = dst;
2027
2028 dst_copy_metrics(dst1, dst);
2029
2030 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2031 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2032 dst1->lastuse = jiffies;
2033
2034 dst1->input = dst_discard;
2035 dst1->output = xdst_queue_output;
2036
2037 dst_hold(dst);
2038 dst1->child = dst;
2039 dst1->path = dst;
2040
2041 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2042
2043 err = -ENODEV;
2044 dev = dst->dev;
2045 if (!dev)
2046 goto free_dst;
2047
2048 err = xfrm_fill_dst(xdst, dev, fl);
2049 if (err)
2050 goto free_dst;
2051
2052 out:
2053 return xdst;
2054
2055 free_dst:
2056 dst_release(dst1);
2057 xdst = ERR_PTR(err);
2058 goto out;
2059 }
2060
2061 static struct flow_cache_object *
2062 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
2063 struct flow_cache_object *oldflo, void *ctx)
2064 {
2065 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
2066 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2067 struct xfrm_dst *xdst, *new_xdst;
2068 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2069
2070 /* Check if the policies from old bundle are usable */
2071 xdst = NULL;
2072 if (oldflo) {
2073 xdst = container_of(oldflo, struct xfrm_dst, flo);
2074 num_pols = xdst->num_pols;
2075 num_xfrms = xdst->num_xfrms;
2076 pol_dead = 0;
2077 for (i = 0; i < num_pols; i++) {
2078 pols[i] = xdst->pols[i];
2079 pol_dead |= pols[i]->walk.dead;
2080 }
2081 if (pol_dead) {
2082 dst_free(&xdst->u.dst);
2083 xdst = NULL;
2084 num_pols = 0;
2085 num_xfrms = 0;
2086 oldflo = NULL;
2087 }
2088 }
2089
2090 /* Resolve policies to use if we couldn't get them from
2091 * previous cache entry */
2092 if (xdst == NULL) {
2093 num_pols = 1;
2094 pols[0] = __xfrm_policy_lookup(net, fl, family,
2095 flow_to_policy_dir(dir));
2096 err = xfrm_expand_policies(fl, family, pols,
2097 &num_pols, &num_xfrms);
2098 if (err < 0)
2099 goto inc_error;
2100 if (num_pols == 0)
2101 return NULL;
2102 if (num_xfrms <= 0)
2103 goto make_dummy_bundle;
2104 }
2105
2106 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2107 xflo->dst_orig);
2108 if (IS_ERR(new_xdst)) {
2109 err = PTR_ERR(new_xdst);
2110 if (err != -EAGAIN)
2111 goto error;
2112 if (oldflo == NULL)
2113 goto make_dummy_bundle;
2114 dst_hold(&xdst->u.dst);
2115 return oldflo;
2116 } else if (new_xdst == NULL) {
2117 num_xfrms = 0;
2118 if (oldflo == NULL)
2119 goto make_dummy_bundle;
2120 xdst->num_xfrms = 0;
2121 dst_hold(&xdst->u.dst);
2122 return oldflo;
2123 }
2124
2125 /* Kill the previous bundle */
2126 if (xdst) {
2127 /* The policies were stolen for newly generated bundle */
2128 xdst->num_pols = 0;
2129 dst_free(&xdst->u.dst);
2130 }
2131
2132 /* Flow cache does not have reference, it dst_free()'s,
2133 * but we do need to return one reference for original caller */
2134 dst_hold(&new_xdst->u.dst);
2135 return &new_xdst->flo;
2136
2137 make_dummy_bundle:
2138 /* We found policies, but there's no bundles to instantiate:
2139 * either because the policy blocks, has no transformations or
2140 * we could not build template (no xfrm_states).*/
2141 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
2142 if (IS_ERR(xdst)) {
2143 xfrm_pols_put(pols, num_pols);
2144 return ERR_CAST(xdst);
2145 }
2146 xdst->num_pols = num_pols;
2147 xdst->num_xfrms = num_xfrms;
2148 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
2149
2150 dst_hold(&xdst->u.dst);
2151 return &xdst->flo;
2152
2153 inc_error:
2154 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2155 error:
2156 if (xdst != NULL)
2157 dst_free(&xdst->u.dst);
2158 else
2159 xfrm_pols_put(pols, num_pols);
2160 return ERR_PTR(err);
2161 }
2162
2163 static struct dst_entry *make_blackhole(struct net *net, u16 family,
2164 struct dst_entry *dst_orig)
2165 {
2166 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2167 struct dst_entry *ret;
2168
2169 if (!afinfo) {
2170 dst_release(dst_orig);
2171 return ERR_PTR(-EINVAL);
2172 } else {
2173 ret = afinfo->blackhole_route(net, dst_orig);
2174 }
2175 xfrm_policy_put_afinfo(afinfo);
2176
2177 return ret;
2178 }
2179
2180 /* Main function: finds/creates a bundle for given flow.
2181 *
2182 * At the moment we eat a raw IP route. Mostly to speed up lookups
2183 * on interfaces with disabled IPsec.
2184 */
2185 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2186 const struct flowi *fl,
2187 const struct sock *sk, int flags)
2188 {
2189 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2190 struct flow_cache_object *flo;
2191 struct xfrm_dst *xdst;
2192 struct dst_entry *dst, *route;
2193 u16 family = dst_orig->ops->family;
2194 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
2195 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
2196
2197 dst = NULL;
2198 xdst = NULL;
2199 route = NULL;
2200
2201 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
2202 num_pols = 1;
2203 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2204 err = xfrm_expand_policies(fl, family, pols,
2205 &num_pols, &num_xfrms);
2206 if (err < 0)
2207 goto dropdst;
2208
2209 if (num_pols) {
2210 if (num_xfrms <= 0) {
2211 drop_pols = num_pols;
2212 goto no_transform;
2213 }
2214
2215 xdst = xfrm_resolve_and_create_bundle(
2216 pols, num_pols, fl,
2217 family, dst_orig);
2218 if (IS_ERR(xdst)) {
2219 xfrm_pols_put(pols, num_pols);
2220 err = PTR_ERR(xdst);
2221 goto dropdst;
2222 } else if (xdst == NULL) {
2223 num_xfrms = 0;
2224 drop_pols = num_pols;
2225 goto no_transform;
2226 }
2227
2228 dst_hold(&xdst->u.dst);
2229 xdst->u.dst.flags |= DST_NOCACHE;
2230 route = xdst->route;
2231 }
2232 }
2233
2234 if (xdst == NULL) {
2235 struct xfrm_flo xflo;
2236
2237 xflo.dst_orig = dst_orig;
2238 xflo.flags = flags;
2239
2240 /* To accelerate a bit... */
2241 if ((dst_orig->flags & DST_NOXFRM) ||
2242 !net->xfrm.policy_count[XFRM_POLICY_OUT])
2243 goto nopol;
2244
2245 flo = flow_cache_lookup(net, fl, family, dir,
2246 xfrm_bundle_lookup, &xflo);
2247 if (flo == NULL)
2248 goto nopol;
2249 if (IS_ERR(flo)) {
2250 err = PTR_ERR(flo);
2251 goto dropdst;
2252 }
2253 xdst = container_of(flo, struct xfrm_dst, flo);
2254
2255 num_pols = xdst->num_pols;
2256 num_xfrms = xdst->num_xfrms;
2257 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
2258 route = xdst->route;
2259 }
2260
2261 dst = &xdst->u.dst;
2262 if (route == NULL && num_xfrms > 0) {
2263 /* The only case when xfrm_bundle_lookup() returns a
2264 * bundle with null route, is when the template could
2265 * not be resolved. It means policies are there, but
2266 * bundle could not be created, since we don't yet
2267 * have the xfrm_state's. We need to wait for KM to
2268 * negotiate new SA's or bail out with error.*/
2269 if (net->xfrm.sysctl_larval_drop) {
2270 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2271 err = -EREMOTE;
2272 goto error;
2273 }
2274
2275 err = -EAGAIN;
2276
2277 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2278 goto error;
2279 }
2280
2281 no_transform:
2282 if (num_pols == 0)
2283 goto nopol;
2284
2285 if ((flags & XFRM_LOOKUP_ICMP) &&
2286 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2287 err = -ENOENT;
2288 goto error;
2289 }
2290
2291 for (i = 0; i < num_pols; i++)
2292 pols[i]->curlft.use_time = get_seconds();
2293
2294 if (num_xfrms < 0) {
2295 /* Prohibit the flow */
2296 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
2297 err = -EPERM;
2298 goto error;
2299 } else if (num_xfrms > 0) {
2300 /* Flow transformed */
2301 dst_release(dst_orig);
2302 } else {
2303 /* Flow passes untransformed */
2304 dst_release(dst);
2305 dst = dst_orig;
2306 }
2307 ok:
2308 xfrm_pols_put(pols, drop_pols);
2309 if (dst && dst->xfrm &&
2310 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2311 dst->flags |= DST_XFRM_TUNNEL;
2312 return dst;
2313
2314 nopol:
2315 if (!(flags & XFRM_LOOKUP_ICMP)) {
2316 dst = dst_orig;
2317 goto ok;
2318 }
2319 err = -ENOENT;
2320 error:
2321 dst_release(dst);
2322 dropdst:
2323 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2324 dst_release(dst_orig);
2325 xfrm_pols_put(pols, drop_pols);
2326 return ERR_PTR(err);
2327 }
2328 EXPORT_SYMBOL(xfrm_lookup);
2329
2330 /* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2331 * Otherwise we may send out blackholed packets.
2332 */
2333 struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2334 const struct flowi *fl,
2335 const struct sock *sk, int flags)
2336 {
2337 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
2338 flags | XFRM_LOOKUP_QUEUE |
2339 XFRM_LOOKUP_KEEP_DST_REF);
2340
2341 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2342 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2343
2344 return dst;
2345 }
2346 EXPORT_SYMBOL(xfrm_lookup_route);
2347
2348 static inline int
2349 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
2350 {
2351 struct xfrm_state *x;
2352
2353 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2354 return 0;
2355 x = skb->sp->xvec[idx];
2356 if (!x->type->reject)
2357 return 0;
2358 return x->type->reject(x, skb, fl);
2359 }
2360
2361 /* When skb is transformed back to its "native" form, we have to
2362 * check policy restrictions. At the moment we make this in maximally
2363 * stupid way. Shame on me. :-) Of course, connected sockets must
2364 * have policy cached at them.
2365 */
2366
2367 static inline int
2368 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
2369 unsigned short family)
2370 {
2371 if (xfrm_state_kern(x))
2372 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
2373 return x->id.proto == tmpl->id.proto &&
2374 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2375 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2376 x->props.mode == tmpl->mode &&
2377 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
2378 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
2379 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2380 xfrm_state_addr_cmp(tmpl, x, family));
2381 }
2382
2383 /*
2384 * 0 or more than 0 is returned when validation is succeeded (either bypass
2385 * because of optional transport mode, or next index of the mathced secpath
2386 * state with the template.
2387 * -1 is returned when no matching template is found.
2388 * Otherwise "-2 - errored_index" is returned.
2389 */
2390 static inline int
2391 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2392 unsigned short family)
2393 {
2394 int idx = start;
2395
2396 if (tmpl->optional) {
2397 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2398 return start;
2399 } else
2400 start = -1;
2401 for (; idx < sp->len; idx++) {
2402 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2403 return ++idx;
2404 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2405 if (start == -1)
2406 start = -2-idx;
2407 break;
2408 }
2409 }
2410 return start;
2411 }
2412
2413 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2414 unsigned int family, int reverse)
2415 {
2416 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2417 int err;
2418
2419 if (unlikely(afinfo == NULL))
2420 return -EAFNOSUPPORT;
2421
2422 afinfo->decode_session(skb, fl, reverse);
2423 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2424 xfrm_policy_put_afinfo(afinfo);
2425 return err;
2426 }
2427 EXPORT_SYMBOL(__xfrm_decode_session);
2428
2429 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2430 {
2431 for (; k < sp->len; k++) {
2432 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2433 *idxp = k;
2434 return 1;
2435 }
2436 }
2437
2438 return 0;
2439 }
2440
2441 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2442 unsigned short family)
2443 {
2444 struct net *net = dev_net(skb->dev);
2445 struct xfrm_policy *pol;
2446 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2447 int npols = 0;
2448 int xfrm_nr;
2449 int pi;
2450 int reverse;
2451 struct flowi fl;
2452 u8 fl_dir;
2453 int xerr_idx = -1;
2454
2455 reverse = dir & ~XFRM_POLICY_MASK;
2456 dir &= XFRM_POLICY_MASK;
2457 fl_dir = policy_to_flow_dir(dir);
2458
2459 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2460 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2461 return 0;
2462 }
2463
2464 nf_nat_decode_session(skb, &fl, family);
2465
2466 /* First, check used SA against their selectors. */
2467 if (skb->sp) {
2468 int i;
2469
2470 for (i = skb->sp->len-1; i >= 0; i--) {
2471 struct xfrm_state *x = skb->sp->xvec[i];
2472 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2473 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2474 return 0;
2475 }
2476 }
2477 }
2478
2479 pol = NULL;
2480 if (sk && sk->sk_policy[dir]) {
2481 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2482 if (IS_ERR(pol)) {
2483 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2484 return 0;
2485 }
2486 }
2487
2488 if (!pol) {
2489 struct flow_cache_object *flo;
2490
2491 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2492 xfrm_policy_lookup, NULL);
2493 if (IS_ERR_OR_NULL(flo))
2494 pol = ERR_CAST(flo);
2495 else
2496 pol = container_of(flo, struct xfrm_policy, flo);
2497 }
2498
2499 if (IS_ERR(pol)) {
2500 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2501 return 0;
2502 }
2503
2504 if (!pol) {
2505 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2506 xfrm_secpath_reject(xerr_idx, skb, &fl);
2507 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2508 return 0;
2509 }
2510 return 1;
2511 }
2512
2513 pol->curlft.use_time = get_seconds();
2514
2515 pols[0] = pol;
2516 npols++;
2517 #ifdef CONFIG_XFRM_SUB_POLICY
2518 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2519 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2520 &fl, family,
2521 XFRM_POLICY_IN);
2522 if (pols[1]) {
2523 if (IS_ERR(pols[1])) {
2524 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2525 return 0;
2526 }
2527 pols[1]->curlft.use_time = get_seconds();
2528 npols++;
2529 }
2530 }
2531 #endif
2532
2533 if (pol->action == XFRM_POLICY_ALLOW) {
2534 struct sec_path *sp;
2535 static struct sec_path dummy;
2536 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2537 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2538 struct xfrm_tmpl **tpp = tp;
2539 int ti = 0;
2540 int i, k;
2541
2542 if ((sp = skb->sp) == NULL)
2543 sp = &dummy;
2544
2545 for (pi = 0; pi < npols; pi++) {
2546 if (pols[pi] != pol &&
2547 pols[pi]->action != XFRM_POLICY_ALLOW) {
2548 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2549 goto reject;
2550 }
2551 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2552 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2553 goto reject_error;
2554 }
2555 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2556 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2557 }
2558 xfrm_nr = ti;
2559 if (npols > 1) {
2560 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
2561 tpp = stp;
2562 }
2563
2564 /* For each tunnel xfrm, find the first matching tmpl.
2565 * For each tmpl before that, find corresponding xfrm.
2566 * Order is _important_. Later we will implement
2567 * some barriers, but at the moment barriers
2568 * are implied between each two transformations.
2569 */
2570 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2571 k = xfrm_policy_ok(tpp[i], sp, k, family);
2572 if (k < 0) {
2573 if (k < -1)
2574 /* "-2 - errored_index" returned */
2575 xerr_idx = -(2+k);
2576 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2577 goto reject;
2578 }
2579 }
2580
2581 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2582 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2583 goto reject;
2584 }
2585
2586 xfrm_pols_put(pols, npols);
2587 return 1;
2588 }
2589 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2590
2591 reject:
2592 xfrm_secpath_reject(xerr_idx, skb, &fl);
2593 reject_error:
2594 xfrm_pols_put(pols, npols);
2595 return 0;
2596 }
2597 EXPORT_SYMBOL(__xfrm_policy_check);
2598
2599 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2600 {
2601 struct net *net = dev_net(skb->dev);
2602 struct flowi fl;
2603 struct dst_entry *dst;
2604 int res = 1;
2605
2606 if (xfrm_decode_session(skb, &fl, family) < 0) {
2607 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2608 return 0;
2609 }
2610
2611 skb_dst_force(skb);
2612
2613 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
2614 if (IS_ERR(dst)) {
2615 res = 0;
2616 dst = NULL;
2617 }
2618 skb_dst_set(skb, dst);
2619 return res;
2620 }
2621 EXPORT_SYMBOL(__xfrm_route_forward);
2622
2623 /* Optimize later using cookies and generation ids. */
2624
2625 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2626 {
2627 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2628 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2629 * get validated by dst_ops->check on every use. We do this
2630 * because when a normal route referenced by an XFRM dst is
2631 * obsoleted we do not go looking around for all parent
2632 * referencing XFRM dsts so that we can invalidate them. It
2633 * is just too much work. Instead we make the checks here on
2634 * every use. For example:
2635 *
2636 * XFRM dst A --> IPv4 dst X
2637 *
2638 * X is the "xdst->route" of A (X is also the "dst->path" of A
2639 * in this example). If X is marked obsolete, "A" will not
2640 * notice. That's what we are validating here via the
2641 * stale_bundle() check.
2642 *
2643 * When a policy's bundle is pruned, we dst_free() the XFRM
2644 * dst which causes it's ->obsolete field to be set to
2645 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2646 * this, we want to force a new route lookup.
2647 */
2648 if (dst->obsolete < 0 && !stale_bundle(dst))
2649 return dst;
2650
2651 return NULL;
2652 }
2653
2654 static int stale_bundle(struct dst_entry *dst)
2655 {
2656 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2657 }
2658
2659 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2660 {
2661 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2662 dst->dev = dev_net(dev)->loopback_dev;
2663 dev_hold(dst->dev);
2664 dev_put(dev);
2665 }
2666 }
2667 EXPORT_SYMBOL(xfrm_dst_ifdown);
2668
2669 static void xfrm_link_failure(struct sk_buff *skb)
2670 {
2671 /* Impossible. Such dst must be popped before reaches point of failure. */
2672 }
2673
2674 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2675 {
2676 if (dst) {
2677 if (dst->obsolete) {
2678 dst_release(dst);
2679 dst = NULL;
2680 }
2681 }
2682 return dst;
2683 }
2684
2685 void xfrm_garbage_collect(struct net *net)
2686 {
2687 flow_cache_flush(net);
2688 }
2689 EXPORT_SYMBOL(xfrm_garbage_collect);
2690
2691 static void xfrm_garbage_collect_deferred(struct net *net)
2692 {
2693 flow_cache_flush_deferred(net);
2694 }
2695
2696 static void xfrm_init_pmtu(struct dst_entry *dst)
2697 {
2698 do {
2699 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2700 u32 pmtu, route_mtu_cached;
2701
2702 pmtu = dst_mtu(dst->child);
2703 xdst->child_mtu_cached = pmtu;
2704
2705 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2706
2707 route_mtu_cached = dst_mtu(xdst->route);
2708 xdst->route_mtu_cached = route_mtu_cached;
2709
2710 if (pmtu > route_mtu_cached)
2711 pmtu = route_mtu_cached;
2712
2713 dst_metric_set(dst, RTAX_MTU, pmtu);
2714 } while ((dst = dst->next));
2715 }
2716
2717 /* Check that the bundle accepts the flow and its components are
2718 * still valid.
2719 */
2720
2721 static int xfrm_bundle_ok(struct xfrm_dst *first)
2722 {
2723 struct dst_entry *dst = &first->u.dst;
2724 struct xfrm_dst *last;
2725 u32 mtu;
2726
2727 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2728 (dst->dev && !netif_running(dst->dev)))
2729 return 0;
2730
2731 if (dst->flags & DST_XFRM_QUEUE)
2732 return 1;
2733
2734 last = NULL;
2735
2736 do {
2737 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2738
2739 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2740 return 0;
2741 if (xdst->xfrm_genid != dst->xfrm->genid)
2742 return 0;
2743 if (xdst->num_pols > 0 &&
2744 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2745 return 0;
2746
2747 mtu = dst_mtu(dst->child);
2748 if (xdst->child_mtu_cached != mtu) {
2749 last = xdst;
2750 xdst->child_mtu_cached = mtu;
2751 }
2752
2753 if (!dst_check(xdst->route, xdst->route_cookie))
2754 return 0;
2755 mtu = dst_mtu(xdst->route);
2756 if (xdst->route_mtu_cached != mtu) {
2757 last = xdst;
2758 xdst->route_mtu_cached = mtu;
2759 }
2760
2761 dst = dst->child;
2762 } while (dst->xfrm);
2763
2764 if (likely(!last))
2765 return 1;
2766
2767 mtu = last->child_mtu_cached;
2768 for (;;) {
2769 dst = &last->u.dst;
2770
2771 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2772 if (mtu > last->route_mtu_cached)
2773 mtu = last->route_mtu_cached;
2774 dst_metric_set(dst, RTAX_MTU, mtu);
2775
2776 if (last == first)
2777 break;
2778
2779 last = (struct xfrm_dst *)last->u.dst.next;
2780 last->child_mtu_cached = mtu;
2781 }
2782
2783 return 1;
2784 }
2785
2786 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2787 {
2788 return dst_metric_advmss(dst->path);
2789 }
2790
2791 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2792 {
2793 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2794
2795 return mtu ? : dst_mtu(dst->path);
2796 }
2797
2798 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2799 struct sk_buff *skb,
2800 const void *daddr)
2801 {
2802 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2803 }
2804
2805 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2806 {
2807 struct net *net;
2808 int err = 0;
2809 if (unlikely(afinfo == NULL))
2810 return -EINVAL;
2811 if (unlikely(afinfo->family >= NPROTO))
2812 return -EAFNOSUPPORT;
2813 spin_lock(&xfrm_policy_afinfo_lock);
2814 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2815 err = -EEXIST;
2816 else {
2817 struct dst_ops *dst_ops = afinfo->dst_ops;
2818 if (likely(dst_ops->kmem_cachep == NULL))
2819 dst_ops->kmem_cachep = xfrm_dst_cache;
2820 if (likely(dst_ops->check == NULL))
2821 dst_ops->check = xfrm_dst_check;
2822 if (likely(dst_ops->default_advmss == NULL))
2823 dst_ops->default_advmss = xfrm_default_advmss;
2824 if (likely(dst_ops->mtu == NULL))
2825 dst_ops->mtu = xfrm_mtu;
2826 if (likely(dst_ops->negative_advice == NULL))
2827 dst_ops->negative_advice = xfrm_negative_advice;
2828 if (likely(dst_ops->link_failure == NULL))
2829 dst_ops->link_failure = xfrm_link_failure;
2830 if (likely(dst_ops->neigh_lookup == NULL))
2831 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2832 if (likely(afinfo->garbage_collect == NULL))
2833 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2834 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2835 }
2836 spin_unlock(&xfrm_policy_afinfo_lock);
2837
2838 rtnl_lock();
2839 for_each_net(net) {
2840 struct dst_ops *xfrm_dst_ops;
2841
2842 switch (afinfo->family) {
2843 case AF_INET:
2844 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2845 break;
2846 #if IS_ENABLED(CONFIG_IPV6)
2847 case AF_INET6:
2848 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2849 break;
2850 #endif
2851 default:
2852 BUG();
2853 }
2854 *xfrm_dst_ops = *afinfo->dst_ops;
2855 }
2856 rtnl_unlock();
2857
2858 return err;
2859 }
2860 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2861
2862 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2863 {
2864 int err = 0;
2865 if (unlikely(afinfo == NULL))
2866 return -EINVAL;
2867 if (unlikely(afinfo->family >= NPROTO))
2868 return -EAFNOSUPPORT;
2869 spin_lock(&xfrm_policy_afinfo_lock);
2870 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2871 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2872 err = -EINVAL;
2873 else
2874 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2875 NULL);
2876 }
2877 spin_unlock(&xfrm_policy_afinfo_lock);
2878 if (!err) {
2879 struct dst_ops *dst_ops = afinfo->dst_ops;
2880
2881 synchronize_rcu();
2882
2883 dst_ops->kmem_cachep = NULL;
2884 dst_ops->check = NULL;
2885 dst_ops->negative_advice = NULL;
2886 dst_ops->link_failure = NULL;
2887 afinfo->garbage_collect = NULL;
2888 }
2889 return err;
2890 }
2891 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2892
2893 static void __net_init xfrm_dst_ops_init(struct net *net)
2894 {
2895 struct xfrm_policy_afinfo *afinfo;
2896
2897 rcu_read_lock();
2898 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2899 if (afinfo)
2900 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2901 #if IS_ENABLED(CONFIG_IPV6)
2902 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2903 if (afinfo)
2904 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2905 #endif
2906 rcu_read_unlock();
2907 }
2908
2909 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2910 {
2911 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2912
2913 switch (event) {
2914 case NETDEV_DOWN:
2915 xfrm_garbage_collect(dev_net(dev));
2916 }
2917 return NOTIFY_DONE;
2918 }
2919
2920 static struct notifier_block xfrm_dev_notifier = {
2921 .notifier_call = xfrm_dev_event,
2922 };
2923
2924 #ifdef CONFIG_XFRM_STATISTICS
2925 static int __net_init xfrm_statistics_init(struct net *net)
2926 {
2927 int rv;
2928 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2929 if (!net->mib.xfrm_statistics)
2930 return -ENOMEM;
2931 rv = xfrm_proc_init(net);
2932 if (rv < 0)
2933 free_percpu(net->mib.xfrm_statistics);
2934 return rv;
2935 }
2936
2937 static void xfrm_statistics_fini(struct net *net)
2938 {
2939 xfrm_proc_fini(net);
2940 free_percpu(net->mib.xfrm_statistics);
2941 }
2942 #else
2943 static int __net_init xfrm_statistics_init(struct net *net)
2944 {
2945 return 0;
2946 }
2947
2948 static void xfrm_statistics_fini(struct net *net)
2949 {
2950 }
2951 #endif
2952
2953 static int __net_init xfrm_policy_init(struct net *net)
2954 {
2955 unsigned int hmask, sz;
2956 int dir;
2957
2958 if (net_eq(net, &init_net))
2959 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2960 sizeof(struct xfrm_dst),
2961 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2962 NULL);
2963
2964 hmask = 8 - 1;
2965 sz = (hmask+1) * sizeof(struct hlist_head);
2966
2967 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2968 if (!net->xfrm.policy_byidx)
2969 goto out_byidx;
2970 net->xfrm.policy_idx_hmask = hmask;
2971
2972 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2973 struct xfrm_policy_hash *htab;
2974
2975 net->xfrm.policy_count[dir] = 0;
2976 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
2977 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2978
2979 htab = &net->xfrm.policy_bydst[dir];
2980 htab->table = xfrm_hash_alloc(sz);
2981 if (!htab->table)
2982 goto out_bydst;
2983 htab->hmask = hmask;
2984 htab->dbits4 = 32;
2985 htab->sbits4 = 32;
2986 htab->dbits6 = 128;
2987 htab->sbits6 = 128;
2988 }
2989 net->xfrm.policy_hthresh.lbits4 = 32;
2990 net->xfrm.policy_hthresh.rbits4 = 32;
2991 net->xfrm.policy_hthresh.lbits6 = 128;
2992 net->xfrm.policy_hthresh.rbits6 = 128;
2993
2994 seqlock_init(&net->xfrm.policy_hthresh.lock);
2995
2996 INIT_LIST_HEAD(&net->xfrm.policy_all);
2997 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2998 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
2999 if (net_eq(net, &init_net))
3000 register_netdevice_notifier(&xfrm_dev_notifier);
3001 return 0;
3002
3003 out_bydst:
3004 for (dir--; dir >= 0; dir--) {
3005 struct xfrm_policy_hash *htab;
3006
3007 htab = &net->xfrm.policy_bydst[dir];
3008 xfrm_hash_free(htab->table, sz);
3009 }
3010 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3011 out_byidx:
3012 return -ENOMEM;
3013 }
3014
3015 static void xfrm_policy_fini(struct net *net)
3016 {
3017 unsigned int sz;
3018 int dir;
3019
3020 flush_work(&net->xfrm.policy_hash_work);
3021 #ifdef CONFIG_XFRM_SUB_POLICY
3022 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
3023 #endif
3024 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
3025
3026 WARN_ON(!list_empty(&net->xfrm.policy_all));
3027
3028 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
3029 struct xfrm_policy_hash *htab;
3030
3031 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
3032
3033 htab = &net->xfrm.policy_bydst[dir];
3034 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
3035 WARN_ON(!hlist_empty(htab->table));
3036 xfrm_hash_free(htab->table, sz);
3037 }
3038
3039 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
3040 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3041 xfrm_hash_free(net->xfrm.policy_byidx, sz);
3042 }
3043
3044 static int __net_init xfrm_net_init(struct net *net)
3045 {
3046 int rv;
3047
3048 rv = xfrm_statistics_init(net);
3049 if (rv < 0)
3050 goto out_statistics;
3051 rv = xfrm_state_init(net);
3052 if (rv < 0)
3053 goto out_state;
3054 rv = xfrm_policy_init(net);
3055 if (rv < 0)
3056 goto out_policy;
3057 xfrm_dst_ops_init(net);
3058 rv = xfrm_sysctl_init(net);
3059 if (rv < 0)
3060 goto out_sysctl;
3061 rv = flow_cache_init(net);
3062 if (rv < 0)
3063 goto out;
3064
3065 /* Initialize the per-net locks here */
3066 spin_lock_init(&net->xfrm.xfrm_state_lock);
3067 rwlock_init(&net->xfrm.xfrm_policy_lock);
3068 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3069
3070 return 0;
3071
3072 out:
3073 xfrm_sysctl_fini(net);
3074 out_sysctl:
3075 xfrm_policy_fini(net);
3076 out_policy:
3077 xfrm_state_fini(net);
3078 out_state:
3079 xfrm_statistics_fini(net);
3080 out_statistics:
3081 return rv;
3082 }
3083
3084 static void __net_exit xfrm_net_exit(struct net *net)
3085 {
3086 flow_cache_fini(net);
3087 xfrm_sysctl_fini(net);
3088 xfrm_policy_fini(net);
3089 xfrm_state_fini(net);
3090 xfrm_statistics_fini(net);
3091 }
3092
3093 static struct pernet_operations __net_initdata xfrm_net_ops = {
3094 .init = xfrm_net_init,
3095 .exit = xfrm_net_exit,
3096 };
3097
3098 void __init xfrm_init(void)
3099 {
3100 register_pernet_subsys(&xfrm_net_ops);
3101 xfrm_input_init();
3102 }
3103
3104 #ifdef CONFIG_AUDITSYSCALL
3105 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3106 struct audit_buffer *audit_buf)
3107 {
3108 struct xfrm_sec_ctx *ctx = xp->security;
3109 struct xfrm_selector *sel = &xp->selector;
3110
3111 if (ctx)
3112 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3113 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3114
3115 switch (sel->family) {
3116 case AF_INET:
3117 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
3118 if (sel->prefixlen_s != 32)
3119 audit_log_format(audit_buf, " src_prefixlen=%d",
3120 sel->prefixlen_s);
3121 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
3122 if (sel->prefixlen_d != 32)
3123 audit_log_format(audit_buf, " dst_prefixlen=%d",
3124 sel->prefixlen_d);
3125 break;
3126 case AF_INET6:
3127 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
3128 if (sel->prefixlen_s != 128)
3129 audit_log_format(audit_buf, " src_prefixlen=%d",
3130 sel->prefixlen_s);
3131 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
3132 if (sel->prefixlen_d != 128)
3133 audit_log_format(audit_buf, " dst_prefixlen=%d",
3134 sel->prefixlen_d);
3135 break;
3136 }
3137 }
3138
3139 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
3140 {
3141 struct audit_buffer *audit_buf;
3142
3143 audit_buf = xfrm_audit_start("SPD-add");
3144 if (audit_buf == NULL)
3145 return;
3146 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3147 audit_log_format(audit_buf, " res=%u", result);
3148 xfrm_audit_common_policyinfo(xp, audit_buf);
3149 audit_log_end(audit_buf);
3150 }
3151 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3152
3153 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
3154 bool task_valid)
3155 {
3156 struct audit_buffer *audit_buf;
3157
3158 audit_buf = xfrm_audit_start("SPD-delete");
3159 if (audit_buf == NULL)
3160 return;
3161 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3162 audit_log_format(audit_buf, " res=%u", result);
3163 xfrm_audit_common_policyinfo(xp, audit_buf);
3164 audit_log_end(audit_buf);
3165 }
3166 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3167 #endif
3168
3169 #ifdef CONFIG_XFRM_MIGRATE
3170 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3171 const struct xfrm_selector *sel_tgt)
3172 {
3173 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3174 if (sel_tgt->family == sel_cmp->family &&
3175 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3176 sel_cmp->family) &&
3177 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3178 sel_cmp->family) &&
3179 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3180 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
3181 return true;
3182 }
3183 } else {
3184 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
3185 return true;
3186 }
3187 }
3188 return false;
3189 }
3190
3191 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3192 u8 dir, u8 type, struct net *net)
3193 {
3194 struct xfrm_policy *pol, *ret = NULL;
3195 struct hlist_head *chain;
3196 u32 priority = ~0U;
3197
3198 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
3199 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
3200 hlist_for_each_entry(pol, chain, bydst) {
3201 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3202 pol->type == type) {
3203 ret = pol;
3204 priority = ret->priority;
3205 break;
3206 }
3207 }
3208 chain = &net->xfrm.policy_inexact[dir];
3209 hlist_for_each_entry(pol, chain, bydst) {
3210 if ((pol->priority >= priority) && ret)
3211 break;
3212
3213 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3214 pol->type == type) {
3215 ret = pol;
3216 break;
3217 }
3218 }
3219
3220 xfrm_pol_hold(ret);
3221
3222 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
3223
3224 return ret;
3225 }
3226
3227 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
3228 {
3229 int match = 0;
3230
3231 if (t->mode == m->mode && t->id.proto == m->proto &&
3232 (m->reqid == 0 || t->reqid == m->reqid)) {
3233 switch (t->mode) {
3234 case XFRM_MODE_TUNNEL:
3235 case XFRM_MODE_BEET:
3236 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3237 m->old_family) &&
3238 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3239 m->old_family)) {
3240 match = 1;
3241 }
3242 break;
3243 case XFRM_MODE_TRANSPORT:
3244 /* in case of transport mode, template does not store
3245 any IP addresses, hence we just compare mode and
3246 protocol */
3247 match = 1;
3248 break;
3249 default:
3250 break;
3251 }
3252 }
3253 return match;
3254 }
3255
3256 /* update endpoint address(es) of template(s) */
3257 static int xfrm_policy_migrate(struct xfrm_policy *pol,
3258 struct xfrm_migrate *m, int num_migrate)
3259 {
3260 struct xfrm_migrate *mp;
3261 int i, j, n = 0;
3262
3263 write_lock_bh(&pol->lock);
3264 if (unlikely(pol->walk.dead)) {
3265 /* target policy has been deleted */
3266 write_unlock_bh(&pol->lock);
3267 return -ENOENT;
3268 }
3269
3270 for (i = 0; i < pol->xfrm_nr; i++) {
3271 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3272 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3273 continue;
3274 n++;
3275 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3276 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
3277 continue;
3278 /* update endpoints */
3279 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3280 sizeof(pol->xfrm_vec[i].id.daddr));
3281 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3282 sizeof(pol->xfrm_vec[i].saddr));
3283 pol->xfrm_vec[i].encap_family = mp->new_family;
3284 /* flush bundles */
3285 atomic_inc(&pol->genid);
3286 }
3287 }
3288
3289 write_unlock_bh(&pol->lock);
3290
3291 if (!n)
3292 return -ENODATA;
3293
3294 return 0;
3295 }
3296
3297 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
3298 {
3299 int i, j;
3300
3301 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3302 return -EINVAL;
3303
3304 for (i = 0; i < num_migrate; i++) {
3305 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3306 m[i].old_family) &&
3307 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3308 m[i].old_family))
3309 return -EINVAL;
3310 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3311 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3312 return -EINVAL;
3313
3314 /* check if there is any duplicated entry */
3315 for (j = i + 1; j < num_migrate; j++) {
3316 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3317 sizeof(m[i].old_daddr)) &&
3318 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3319 sizeof(m[i].old_saddr)) &&
3320 m[i].proto == m[j].proto &&
3321 m[i].mode == m[j].mode &&
3322 m[i].reqid == m[j].reqid &&
3323 m[i].old_family == m[j].old_family)
3324 return -EINVAL;
3325 }
3326 }
3327
3328 return 0;
3329 }
3330
3331 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3332 struct xfrm_migrate *m, int num_migrate,
3333 struct xfrm_kmaddress *k, struct net *net)
3334 {
3335 int i, err, nx_cur = 0, nx_new = 0;
3336 struct xfrm_policy *pol = NULL;
3337 struct xfrm_state *x, *xc;
3338 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3339 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3340 struct xfrm_migrate *mp;
3341
3342 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3343 goto out;
3344
3345 /* Stage 1 - find policy */
3346 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
3347 err = -ENOENT;
3348 goto out;
3349 }
3350
3351 /* Stage 2 - find and update state(s) */
3352 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
3353 if ((x = xfrm_migrate_state_find(mp, net))) {
3354 x_cur[nx_cur] = x;
3355 nx_cur++;
3356 if ((xc = xfrm_state_migrate(x, mp))) {
3357 x_new[nx_new] = xc;
3358 nx_new++;
3359 } else {
3360 err = -ENODATA;
3361 goto restore_state;
3362 }
3363 }
3364 }
3365
3366 /* Stage 3 - update policy */
3367 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3368 goto restore_state;
3369
3370 /* Stage 4 - delete old state(s) */
3371 if (nx_cur) {
3372 xfrm_states_put(x_cur, nx_cur);
3373 xfrm_states_delete(x_cur, nx_cur);
3374 }
3375
3376 /* Stage 5 - announce */
3377 km_migrate(sel, dir, type, m, num_migrate, k);
3378
3379 xfrm_pol_put(pol);
3380
3381 return 0;
3382 out:
3383 return err;
3384
3385 restore_state:
3386 if (pol)
3387 xfrm_pol_put(pol);
3388 if (nx_cur)
3389 xfrm_states_put(x_cur, nx_cur);
3390 if (nx_new)
3391 xfrm_states_delete(x_new, nx_new);
3392
3393 return err;
3394 }
3395 EXPORT_SYMBOL(xfrm_migrate);
3396 #endif
Linux kernel - Deliverables
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