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staging: brcm80211: updated maintainers contact information
[zen-stable.git] / net / xfrm / xfrm_policy.c
blob044e77898512b43d772f43659388aee51db19012
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/xfrm.h>
30 #include <net/ip.h>
31 #ifdef CONFIG_XFRM_STATISTICS
32 #include <net/snmp.h>
33 #endif
34
35 #include "xfrm_hash.h"
36
37 DEFINE_MUTEX(xfrm_cfg_mutex);
38 EXPORT_SYMBOL(xfrm_cfg_mutex);
39
40 static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock);
41 static struct dst_entry *xfrm_policy_sk_bundles;
42 static DEFINE_RWLOCK(xfrm_policy_lock);
43
44 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
45 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
46
47 static struct kmem_cache *xfrm_dst_cache __read_mostly;
48
49 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
50 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
51 static void xfrm_init_pmtu(struct dst_entry *dst);
52 static int stale_bundle(struct dst_entry *dst);
53 static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
54 struct flowi *fl, int family, int strict);
55
56
57 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
58 int dir);
59
60 static inline int
61 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
62 {
63 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
64 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
65 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
66 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
67 (fl->proto == sel->proto || !sel->proto) &&
68 (fl->oif == sel->ifindex || !sel->ifindex);
69 }
70
71 static inline int
72 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
73 {
74 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
75 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
76 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
77 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
78 (fl->proto == sel->proto || !sel->proto) &&
79 (fl->oif == sel->ifindex || !sel->ifindex);
80 }
81
82 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
83 unsigned short family)
84 {
85 switch (family) {
86 case AF_INET:
87 return __xfrm4_selector_match(sel, fl);
88 case AF_INET6:
89 return __xfrm6_selector_match(sel, fl);
90 }
91 return 0;
92 }
93
94 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
95 xfrm_address_t *saddr,
96 xfrm_address_t *daddr,
97 int family)
98 {
99 struct xfrm_policy_afinfo *afinfo;
100 struct dst_entry *dst;
101
102 afinfo = xfrm_policy_get_afinfo(family);
103 if (unlikely(afinfo == NULL))
104 return ERR_PTR(-EAFNOSUPPORT);
105
106 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
107
108 xfrm_policy_put_afinfo(afinfo);
109
110 return dst;
111 }
112
113 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
114 xfrm_address_t *prev_saddr,
115 xfrm_address_t *prev_daddr,
116 int family)
117 {
118 struct net *net = xs_net(x);
119 xfrm_address_t *saddr = &x->props.saddr;
120 xfrm_address_t *daddr = &x->id.daddr;
121 struct dst_entry *dst;
122
123 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
124 saddr = x->coaddr;
125 daddr = prev_daddr;
126 }
127 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
128 saddr = prev_saddr;
129 daddr = x->coaddr;
130 }
131
132 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
133
134 if (!IS_ERR(dst)) {
135 if (prev_saddr != saddr)
136 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
137 if (prev_daddr != daddr)
138 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
139 }
140
141 return dst;
142 }
143
144 static inline unsigned long make_jiffies(long secs)
145 {
146 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
147 return MAX_SCHEDULE_TIMEOUT-1;
148 else
149 return secs*HZ;
150 }
151
152 static void xfrm_policy_timer(unsigned long data)
153 {
154 struct xfrm_policy *xp = (struct xfrm_policy*)data;
155 unsigned long now = get_seconds();
156 long next = LONG_MAX;
157 int warn = 0;
158 int dir;
159
160 read_lock(&xp->lock);
161
162 if (unlikely(xp->walk.dead))
163 goto out;
164
165 dir = xfrm_policy_id2dir(xp->index);
166
167 if (xp->lft.hard_add_expires_seconds) {
168 long tmo = xp->lft.hard_add_expires_seconds +
169 xp->curlft.add_time - now;
170 if (tmo <= 0)
171 goto expired;
172 if (tmo < next)
173 next = tmo;
174 }
175 if (xp->lft.hard_use_expires_seconds) {
176 long tmo = xp->lft.hard_use_expires_seconds +
177 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
178 if (tmo <= 0)
179 goto expired;
180 if (tmo < next)
181 next = tmo;
182 }
183 if (xp->lft.soft_add_expires_seconds) {
184 long tmo = xp->lft.soft_add_expires_seconds +
185 xp->curlft.add_time - now;
186 if (tmo <= 0) {
187 warn = 1;
188 tmo = XFRM_KM_TIMEOUT;
189 }
190 if (tmo < next)
191 next = tmo;
192 }
193 if (xp->lft.soft_use_expires_seconds) {
194 long tmo = xp->lft.soft_use_expires_seconds +
195 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
196 if (tmo <= 0) {
197 warn = 1;
198 tmo = XFRM_KM_TIMEOUT;
199 }
200 if (tmo < next)
201 next = tmo;
202 }
203
204 if (warn)
205 km_policy_expired(xp, dir, 0, 0);
206 if (next != LONG_MAX &&
207 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
208 xfrm_pol_hold(xp);
209
210 out:
211 read_unlock(&xp->lock);
212 xfrm_pol_put(xp);
213 return;
214
215 expired:
216 read_unlock(&xp->lock);
217 if (!xfrm_policy_delete(xp, dir))
218 km_policy_expired(xp, dir, 1, 0);
219 xfrm_pol_put(xp);
220 }
221
222 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
223 {
224 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
225
226 if (unlikely(pol->walk.dead))
227 flo = NULL;
228 else
229 xfrm_pol_hold(pol);
230
231 return flo;
232 }
233
234 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
235 {
236 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
237
238 return !pol->walk.dead;
239 }
240
241 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
242 {
243 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
244 }
245
246 static const struct flow_cache_ops xfrm_policy_fc_ops = {
247 .get = xfrm_policy_flo_get,
248 .check = xfrm_policy_flo_check,
249 .delete = xfrm_policy_flo_delete,
250 };
251
252 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
253 * SPD calls.
254 */
255
256 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
257 {
258 struct xfrm_policy *policy;
259
260 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
261
262 if (policy) {
263 write_pnet(&policy->xp_net, net);
264 INIT_LIST_HEAD(&policy->walk.all);
265 INIT_HLIST_NODE(&policy->bydst);
266 INIT_HLIST_NODE(&policy->byidx);
267 rwlock_init(&policy->lock);
268 atomic_set(&policy->refcnt, 1);
269 setup_timer(&policy->timer, xfrm_policy_timer,
270 (unsigned long)policy);
271 policy->flo.ops = &xfrm_policy_fc_ops;
272 }
273 return policy;
274 }
275 EXPORT_SYMBOL(xfrm_policy_alloc);
276
277 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
278
279 void xfrm_policy_destroy(struct xfrm_policy *policy)
280 {
281 BUG_ON(!policy->walk.dead);
282
283 if (del_timer(&policy->timer))
284 BUG();
285
286 security_xfrm_policy_free(policy->security);
287 kfree(policy);
288 }
289 EXPORT_SYMBOL(xfrm_policy_destroy);
290
291 /* Rule must be locked. Release descentant resources, announce
292 * entry dead. The rule must be unlinked from lists to the moment.
293 */
294
295 static void xfrm_policy_kill(struct xfrm_policy *policy)
296 {
297 policy->walk.dead = 1;
298
299 atomic_inc(&policy->genid);
300
301 if (del_timer(&policy->timer))
302 xfrm_pol_put(policy);
303
304 xfrm_pol_put(policy);
305 }
306
307 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
308
309 static inline unsigned int idx_hash(struct net *net, u32 index)
310 {
311 return __idx_hash(index, net->xfrm.policy_idx_hmask);
312 }
313
314 static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
315 {
316 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
317 unsigned int hash = __sel_hash(sel, family, hmask);
318
319 return (hash == hmask + 1 ?
320 &net->xfrm.policy_inexact[dir] :
321 net->xfrm.policy_bydst[dir].table + hash);
322 }
323
324 static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
325 {
326 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
327 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
328
329 return net->xfrm.policy_bydst[dir].table + hash;
330 }
331
332 static void xfrm_dst_hash_transfer(struct hlist_head *list,
333 struct hlist_head *ndsttable,
334 unsigned int nhashmask)
335 {
336 struct hlist_node *entry, *tmp, *entry0 = NULL;
337 struct xfrm_policy *pol;
338 unsigned int h0 = 0;
339
340 redo:
341 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
342 unsigned int h;
343
344 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
345 pol->family, nhashmask);
346 if (!entry0) {
347 hlist_del(entry);
348 hlist_add_head(&pol->bydst, ndsttable+h);
349 h0 = h;
350 } else {
351 if (h != h0)
352 continue;
353 hlist_del(entry);
354 hlist_add_after(entry0, &pol->bydst);
355 }
356 entry0 = entry;
357 }
358 if (!hlist_empty(list)) {
359 entry0 = NULL;
360 goto redo;
361 }
362 }
363
364 static void xfrm_idx_hash_transfer(struct hlist_head *list,
365 struct hlist_head *nidxtable,
366 unsigned int nhashmask)
367 {
368 struct hlist_node *entry, *tmp;
369 struct xfrm_policy *pol;
370
371 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
372 unsigned int h;
373
374 h = __idx_hash(pol->index, nhashmask);
375 hlist_add_head(&pol->byidx, nidxtable+h);
376 }
377 }
378
379 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
380 {
381 return ((old_hmask + 1) << 1) - 1;
382 }
383
384 static void xfrm_bydst_resize(struct net *net, int dir)
385 {
386 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
387 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
388 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
389 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
390 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
391 int i;
392
393 if (!ndst)
394 return;
395
396 write_lock_bh(&xfrm_policy_lock);
397
398 for (i = hmask; i >= 0; i--)
399 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
400
401 net->xfrm.policy_bydst[dir].table = ndst;
402 net->xfrm.policy_bydst[dir].hmask = nhashmask;
403
404 write_unlock_bh(&xfrm_policy_lock);
405
406 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
407 }
408
409 static void xfrm_byidx_resize(struct net *net, int total)
410 {
411 unsigned int hmask = net->xfrm.policy_idx_hmask;
412 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
413 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
414 struct hlist_head *oidx = net->xfrm.policy_byidx;
415 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
416 int i;
417
418 if (!nidx)
419 return;
420
421 write_lock_bh(&xfrm_policy_lock);
422
423 for (i = hmask; i >= 0; i--)
424 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
425
426 net->xfrm.policy_byidx = nidx;
427 net->xfrm.policy_idx_hmask = nhashmask;
428
429 write_unlock_bh(&xfrm_policy_lock);
430
431 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
432 }
433
434 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
435 {
436 unsigned int cnt = net->xfrm.policy_count[dir];
437 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
438
439 if (total)
440 *total += cnt;
441
442 if ((hmask + 1) < xfrm_policy_hashmax &&
443 cnt > hmask)
444 return 1;
445
446 return 0;
447 }
448
449 static inline int xfrm_byidx_should_resize(struct net *net, int total)
450 {
451 unsigned int hmask = net->xfrm.policy_idx_hmask;
452
453 if ((hmask + 1) < xfrm_policy_hashmax &&
454 total > hmask)
455 return 1;
456
457 return 0;
458 }
459
460 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
461 {
462 read_lock_bh(&xfrm_policy_lock);
463 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
464 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
465 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
466 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
467 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
468 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
469 si->spdhcnt = net->xfrm.policy_idx_hmask;
470 si->spdhmcnt = xfrm_policy_hashmax;
471 read_unlock_bh(&xfrm_policy_lock);
472 }
473 EXPORT_SYMBOL(xfrm_spd_getinfo);
474
475 static DEFINE_MUTEX(hash_resize_mutex);
476 static void xfrm_hash_resize(struct work_struct *work)
477 {
478 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
479 int dir, total;
480
481 mutex_lock(&hash_resize_mutex);
482
483 total = 0;
484 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
485 if (xfrm_bydst_should_resize(net, dir, &total))
486 xfrm_bydst_resize(net, dir);
487 }
488 if (xfrm_byidx_should_resize(net, total))
489 xfrm_byidx_resize(net, total);
490
491 mutex_unlock(&hash_resize_mutex);
492 }
493
494 /* Generate new index... KAME seems to generate them ordered by cost
495 * of an absolute inpredictability of ordering of rules. This will not pass. */
496 static u32 xfrm_gen_index(struct net *net, int dir)
497 {
498 static u32 idx_generator;
499
500 for (;;) {
501 struct hlist_node *entry;
502 struct hlist_head *list;
503 struct xfrm_policy *p;
504 u32 idx;
505 int found;
506
507 idx = (idx_generator | dir);
508 idx_generator += 8;
509 if (idx == 0)
510 idx = 8;
511 list = net->xfrm.policy_byidx + idx_hash(net, idx);
512 found = 0;
513 hlist_for_each_entry(p, entry, list, byidx) {
514 if (p->index == idx) {
515 found = 1;
516 break;
517 }
518 }
519 if (!found)
520 return idx;
521 }
522 }
523
524 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
525 {
526 u32 *p1 = (u32 *) s1;
527 u32 *p2 = (u32 *) s2;
528 int len = sizeof(struct xfrm_selector) / sizeof(u32);
529 int i;
530
531 for (i = 0; i < len; i++) {
532 if (p1[i] != p2[i])
533 return 1;
534 }
535
536 return 0;
537 }
538
539 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
540 {
541 struct net *net = xp_net(policy);
542 struct xfrm_policy *pol;
543 struct xfrm_policy *delpol;
544 struct hlist_head *chain;
545 struct hlist_node *entry, *newpos;
546 u32 mark = policy->mark.v & policy->mark.m;
547
548 write_lock_bh(&xfrm_policy_lock);
549 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
550 delpol = NULL;
551 newpos = NULL;
552 hlist_for_each_entry(pol, entry, chain, bydst) {
553 if (pol->type == policy->type &&
554 !selector_cmp(&pol->selector, &policy->selector) &&
555 (mark & pol->mark.m) == pol->mark.v &&
556 xfrm_sec_ctx_match(pol->security, policy->security) &&
557 !WARN_ON(delpol)) {
558 if (excl) {
559 write_unlock_bh(&xfrm_policy_lock);
560 return -EEXIST;
561 }
562 delpol = pol;
563 if (policy->priority > pol->priority)
564 continue;
565 } else if (policy->priority >= pol->priority) {
566 newpos = &pol->bydst;
567 continue;
568 }
569 if (delpol)
570 break;
571 }
572 if (newpos)
573 hlist_add_after(newpos, &policy->bydst);
574 else
575 hlist_add_head(&policy->bydst, chain);
576 xfrm_pol_hold(policy);
577 net->xfrm.policy_count[dir]++;
578 atomic_inc(&flow_cache_genid);
579 if (delpol)
580 __xfrm_policy_unlink(delpol, dir);
581 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
582 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
583 policy->curlft.add_time = get_seconds();
584 policy->curlft.use_time = 0;
585 if (!mod_timer(&policy->timer, jiffies + HZ))
586 xfrm_pol_hold(policy);
587 list_add(&policy->walk.all, &net->xfrm.policy_all);
588 write_unlock_bh(&xfrm_policy_lock);
589
590 if (delpol)
591 xfrm_policy_kill(delpol);
592 else if (xfrm_bydst_should_resize(net, dir, NULL))
593 schedule_work(&net->xfrm.policy_hash_work);
594
595 return 0;
596 }
597 EXPORT_SYMBOL(xfrm_policy_insert);
598
599 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
600 int dir, struct xfrm_selector *sel,
601 struct xfrm_sec_ctx *ctx, int delete,
602 int *err)
603 {
604 struct xfrm_policy *pol, *ret;
605 struct hlist_head *chain;
606 struct hlist_node *entry;
607
608 *err = 0;
609 write_lock_bh(&xfrm_policy_lock);
610 chain = policy_hash_bysel(net, sel, sel->family, dir);
611 ret = NULL;
612 hlist_for_each_entry(pol, entry, chain, bydst) {
613 if (pol->type == type &&
614 (mark & pol->mark.m) == pol->mark.v &&
615 !selector_cmp(sel, &pol->selector) &&
616 xfrm_sec_ctx_match(ctx, pol->security)) {
617 xfrm_pol_hold(pol);
618 if (delete) {
619 *err = security_xfrm_policy_delete(
620 pol->security);
621 if (*err) {
622 write_unlock_bh(&xfrm_policy_lock);
623 return pol;
624 }
625 __xfrm_policy_unlink(pol, dir);
626 }
627 ret = pol;
628 break;
629 }
630 }
631 write_unlock_bh(&xfrm_policy_lock);
632
633 if (ret && delete)
634 xfrm_policy_kill(ret);
635 return ret;
636 }
637 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
638
639 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
640 int dir, u32 id, int delete, int *err)
641 {
642 struct xfrm_policy *pol, *ret;
643 struct hlist_head *chain;
644 struct hlist_node *entry;
645
646 *err = -ENOENT;
647 if (xfrm_policy_id2dir(id) != dir)
648 return NULL;
649
650 *err = 0;
651 write_lock_bh(&xfrm_policy_lock);
652 chain = net->xfrm.policy_byidx + idx_hash(net, id);
653 ret = NULL;
654 hlist_for_each_entry(pol, entry, chain, byidx) {
655 if (pol->type == type && pol->index == id &&
656 (mark & pol->mark.m) == pol->mark.v) {
657 xfrm_pol_hold(pol);
658 if (delete) {
659 *err = security_xfrm_policy_delete(
660 pol->security);
661 if (*err) {
662 write_unlock_bh(&xfrm_policy_lock);
663 return pol;
664 }
665 __xfrm_policy_unlink(pol, dir);
666 }
667 ret = pol;
668 break;
669 }
670 }
671 write_unlock_bh(&xfrm_policy_lock);
672
673 if (ret && delete)
674 xfrm_policy_kill(ret);
675 return ret;
676 }
677 EXPORT_SYMBOL(xfrm_policy_byid);
678
679 #ifdef CONFIG_SECURITY_NETWORK_XFRM
680 static inline int
681 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
682 {
683 int dir, err = 0;
684
685 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
686 struct xfrm_policy *pol;
687 struct hlist_node *entry;
688 int i;
689
690 hlist_for_each_entry(pol, entry,
691 &net->xfrm.policy_inexact[dir], bydst) {
692 if (pol->type != type)
693 continue;
694 err = security_xfrm_policy_delete(pol->security);
695 if (err) {
696 xfrm_audit_policy_delete(pol, 0,
697 audit_info->loginuid,
698 audit_info->sessionid,
699 audit_info->secid);
700 return err;
701 }
702 }
703 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
704 hlist_for_each_entry(pol, entry,
705 net->xfrm.policy_bydst[dir].table + i,
706 bydst) {
707 if (pol->type != type)
708 continue;
709 err = security_xfrm_policy_delete(
710 pol->security);
711 if (err) {
712 xfrm_audit_policy_delete(pol, 0,
713 audit_info->loginuid,
714 audit_info->sessionid,
715 audit_info->secid);
716 return err;
717 }
718 }
719 }
720 }
721 return err;
722 }
723 #else
724 static inline int
725 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
726 {
727 return 0;
728 }
729 #endif
730
731 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
732 {
733 int dir, err = 0, cnt = 0;
734
735 write_lock_bh(&xfrm_policy_lock);
736
737 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
738 if (err)
739 goto out;
740
741 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
742 struct xfrm_policy *pol;
743 struct hlist_node *entry;
744 int i;
745
746 again1:
747 hlist_for_each_entry(pol, entry,
748 &net->xfrm.policy_inexact[dir], bydst) {
749 if (pol->type != type)
750 continue;
751 __xfrm_policy_unlink(pol, dir);
752 write_unlock_bh(&xfrm_policy_lock);
753 cnt++;
754
755 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
756 audit_info->sessionid,
757 audit_info->secid);
758
759 xfrm_policy_kill(pol);
760
761 write_lock_bh(&xfrm_policy_lock);
762 goto again1;
763 }
764
765 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
766 again2:
767 hlist_for_each_entry(pol, entry,
768 net->xfrm.policy_bydst[dir].table + i,
769 bydst) {
770 if (pol->type != type)
771 continue;
772 __xfrm_policy_unlink(pol, dir);
773 write_unlock_bh(&xfrm_policy_lock);
774 cnt++;
775
776 xfrm_audit_policy_delete(pol, 1,
777 audit_info->loginuid,
778 audit_info->sessionid,
779 audit_info->secid);
780 xfrm_policy_kill(pol);
781
782 write_lock_bh(&xfrm_policy_lock);
783 goto again2;
784 }
785 }
786
787 }
788 if (!cnt)
789 err = -ESRCH;
790 out:
791 write_unlock_bh(&xfrm_policy_lock);
792 return err;
793 }
794 EXPORT_SYMBOL(xfrm_policy_flush);
795
796 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
797 int (*func)(struct xfrm_policy *, int, int, void*),
798 void *data)
799 {
800 struct xfrm_policy *pol;
801 struct xfrm_policy_walk_entry *x;
802 int error = 0;
803
804 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
805 walk->type != XFRM_POLICY_TYPE_ANY)
806 return -EINVAL;
807
808 if (list_empty(&walk->walk.all) && walk->seq != 0)
809 return 0;
810
811 write_lock_bh(&xfrm_policy_lock);
812 if (list_empty(&walk->walk.all))
813 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
814 else
815 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
816 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
817 if (x->dead)
818 continue;
819 pol = container_of(x, struct xfrm_policy, walk);
820 if (walk->type != XFRM_POLICY_TYPE_ANY &&
821 walk->type != pol->type)
822 continue;
823 error = func(pol, xfrm_policy_id2dir(pol->index),
824 walk->seq, data);
825 if (error) {
826 list_move_tail(&walk->walk.all, &x->all);
827 goto out;
828 }
829 walk->seq++;
830 }
831 if (walk->seq == 0) {
832 error = -ENOENT;
833 goto out;
834 }
835 list_del_init(&walk->walk.all);
836 out:
837 write_unlock_bh(&xfrm_policy_lock);
838 return error;
839 }
840 EXPORT_SYMBOL(xfrm_policy_walk);
841
842 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
843 {
844 INIT_LIST_HEAD(&walk->walk.all);
845 walk->walk.dead = 1;
846 walk->type = type;
847 walk->seq = 0;
848 }
849 EXPORT_SYMBOL(xfrm_policy_walk_init);
850
851 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
852 {
853 if (list_empty(&walk->walk.all))
854 return;
855
856 write_lock_bh(&xfrm_policy_lock);
857 list_del(&walk->walk.all);
858 write_unlock_bh(&xfrm_policy_lock);
859 }
860 EXPORT_SYMBOL(xfrm_policy_walk_done);
861
862 /*
863 * Find policy to apply to this flow.
864 *
865 * Returns 0 if policy found, else an -errno.
866 */
867 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
868 u8 type, u16 family, int dir)
869 {
870 struct xfrm_selector *sel = &pol->selector;
871 int match, ret = -ESRCH;
872
873 if (pol->family != family ||
874 (fl->mark & pol->mark.m) != pol->mark.v ||
875 pol->type != type)
876 return ret;
877
878 match = xfrm_selector_match(sel, fl, family);
879 if (match)
880 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
881 dir);
882
883 return ret;
884 }
885
886 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
887 struct flowi *fl,
888 u16 family, u8 dir)
889 {
890 int err;
891 struct xfrm_policy *pol, *ret;
892 xfrm_address_t *daddr, *saddr;
893 struct hlist_node *entry;
894 struct hlist_head *chain;
895 u32 priority = ~0U;
896
897 daddr = xfrm_flowi_daddr(fl, family);
898 saddr = xfrm_flowi_saddr(fl, family);
899 if (unlikely(!daddr || !saddr))
900 return NULL;
901
902 read_lock_bh(&xfrm_policy_lock);
903 chain = policy_hash_direct(net, daddr, saddr, family, dir);
904 ret = NULL;
905 hlist_for_each_entry(pol, entry, chain, bydst) {
906 err = xfrm_policy_match(pol, fl, type, family, dir);
907 if (err) {
908 if (err == -ESRCH)
909 continue;
910 else {
911 ret = ERR_PTR(err);
912 goto fail;
913 }
914 } else {
915 ret = pol;
916 priority = ret->priority;
917 break;
918 }
919 }
920 chain = &net->xfrm.policy_inexact[dir];
921 hlist_for_each_entry(pol, entry, chain, bydst) {
922 err = xfrm_policy_match(pol, fl, type, family, dir);
923 if (err) {
924 if (err == -ESRCH)
925 continue;
926 else {
927 ret = ERR_PTR(err);
928 goto fail;
929 }
930 } else if (pol->priority < priority) {
931 ret = pol;
932 break;
933 }
934 }
935 if (ret)
936 xfrm_pol_hold(ret);
937 fail:
938 read_unlock_bh(&xfrm_policy_lock);
939
940 return ret;
941 }
942
943 static struct xfrm_policy *
944 __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
945 {
946 #ifdef CONFIG_XFRM_SUB_POLICY
947 struct xfrm_policy *pol;
948
949 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
950 if (pol != NULL)
951 return pol;
952 #endif
953 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
954 }
955
956 static struct flow_cache_object *
957 xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
958 u8 dir, struct flow_cache_object *old_obj, void *ctx)
959 {
960 struct xfrm_policy *pol;
961
962 if (old_obj)
963 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
964
965 pol = __xfrm_policy_lookup(net, fl, family, dir);
966 if (IS_ERR_OR_NULL(pol))
967 return ERR_CAST(pol);
968
969 /* Resolver returns two references:
970 * one for cache and one for caller of flow_cache_lookup() */
971 xfrm_pol_hold(pol);
972
973 return &pol->flo;
974 }
975
976 static inline int policy_to_flow_dir(int dir)
977 {
978 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
979 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
980 XFRM_POLICY_FWD == FLOW_DIR_FWD)
981 return dir;
982 switch (dir) {
983 default:
984 case XFRM_POLICY_IN:
985 return FLOW_DIR_IN;
986 case XFRM_POLICY_OUT:
987 return FLOW_DIR_OUT;
988 case XFRM_POLICY_FWD:
989 return FLOW_DIR_FWD;
990 }
991 }
992
993 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
994 {
995 struct xfrm_policy *pol;
996
997 read_lock_bh(&xfrm_policy_lock);
998 if ((pol = sk->sk_policy[dir]) != NULL) {
999 int match = xfrm_selector_match(&pol->selector, fl,
1000 sk->sk_family);
1001 int err = 0;
1002
1003 if (match) {
1004 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1005 pol = NULL;
1006 goto out;
1007 }
1008 err = security_xfrm_policy_lookup(pol->security,
1009 fl->secid,
1010 policy_to_flow_dir(dir));
1011 if (!err)
1012 xfrm_pol_hold(pol);
1013 else if (err == -ESRCH)
1014 pol = NULL;
1015 else
1016 pol = ERR_PTR(err);
1017 } else
1018 pol = NULL;
1019 }
1020 out:
1021 read_unlock_bh(&xfrm_policy_lock);
1022 return pol;
1023 }
1024
1025 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1026 {
1027 struct net *net = xp_net(pol);
1028 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1029 pol->family, dir);
1030
1031 list_add(&pol->walk.all, &net->xfrm.policy_all);
1032 hlist_add_head(&pol->bydst, chain);
1033 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1034 net->xfrm.policy_count[dir]++;
1035 xfrm_pol_hold(pol);
1036
1037 if (xfrm_bydst_should_resize(net, dir, NULL))
1038 schedule_work(&net->xfrm.policy_hash_work);
1039 }
1040
1041 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1042 int dir)
1043 {
1044 struct net *net = xp_net(pol);
1045
1046 if (hlist_unhashed(&pol->bydst))
1047 return NULL;
1048
1049 hlist_del(&pol->bydst);
1050 hlist_del(&pol->byidx);
1051 list_del(&pol->walk.all);
1052 net->xfrm.policy_count[dir]--;
1053
1054 return pol;
1055 }
1056
1057 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1058 {
1059 write_lock_bh(&xfrm_policy_lock);
1060 pol = __xfrm_policy_unlink(pol, dir);
1061 write_unlock_bh(&xfrm_policy_lock);
1062 if (pol) {
1063 xfrm_policy_kill(pol);
1064 return 0;
1065 }
1066 return -ENOENT;
1067 }
1068 EXPORT_SYMBOL(xfrm_policy_delete);
1069
1070 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1071 {
1072 struct net *net = xp_net(pol);
1073 struct xfrm_policy *old_pol;
1074
1075 #ifdef CONFIG_XFRM_SUB_POLICY
1076 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1077 return -EINVAL;
1078 #endif
1079
1080 write_lock_bh(&xfrm_policy_lock);
1081 old_pol = sk->sk_policy[dir];
1082 sk->sk_policy[dir] = pol;
1083 if (pol) {
1084 pol->curlft.add_time = get_seconds();
1085 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1086 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1087 }
1088 if (old_pol)
1089 /* Unlinking succeeds always. This is the only function
1090 * allowed to delete or replace socket policy.
1091 */
1092 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1093 write_unlock_bh(&xfrm_policy_lock);
1094
1095 if (old_pol) {
1096 xfrm_policy_kill(old_pol);
1097 }
1098 return 0;
1099 }
1100
1101 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1102 {
1103 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1104
1105 if (newp) {
1106 newp->selector = old->selector;
1107 if (security_xfrm_policy_clone(old->security,
1108 &newp->security)) {
1109 kfree(newp);
1110 return NULL; /* ENOMEM */
1111 }
1112 newp->lft = old->lft;
1113 newp->curlft = old->curlft;
1114 newp->mark = old->mark;
1115 newp->action = old->action;
1116 newp->flags = old->flags;
1117 newp->xfrm_nr = old->xfrm_nr;
1118 newp->index = old->index;
1119 newp->type = old->type;
1120 memcpy(newp->xfrm_vec, old->xfrm_vec,
1121 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1122 write_lock_bh(&xfrm_policy_lock);
1123 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1124 write_unlock_bh(&xfrm_policy_lock);
1125 xfrm_pol_put(newp);
1126 }
1127 return newp;
1128 }
1129
1130 int __xfrm_sk_clone_policy(struct sock *sk)
1131 {
1132 struct xfrm_policy *p0 = sk->sk_policy[0],
1133 *p1 = sk->sk_policy[1];
1134
1135 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1136 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1137 return -ENOMEM;
1138 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1139 return -ENOMEM;
1140 return 0;
1141 }
1142
1143 static int
1144 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1145 unsigned short family)
1146 {
1147 int err;
1148 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1149
1150 if (unlikely(afinfo == NULL))
1151 return -EINVAL;
1152 err = afinfo->get_saddr(net, local, remote);
1153 xfrm_policy_put_afinfo(afinfo);
1154 return err;
1155 }
1156
1157 /* Resolve list of templates for the flow, given policy. */
1158
1159 static int
1160 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1161 struct xfrm_state **xfrm,
1162 unsigned short family)
1163 {
1164 struct net *net = xp_net(policy);
1165 int nx;
1166 int i, error;
1167 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1168 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1169 xfrm_address_t tmp;
1170
1171 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1172 struct xfrm_state *x;
1173 xfrm_address_t *remote = daddr;
1174 xfrm_address_t *local = saddr;
1175 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1176
1177 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1178 tmpl->mode == XFRM_MODE_BEET) {
1179 remote = &tmpl->id.daddr;
1180 local = &tmpl->saddr;
1181 if (xfrm_addr_any(local, tmpl->encap_family)) {
1182 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1183 if (error)
1184 goto fail;
1185 local = &tmp;
1186 }
1187 }
1188
1189 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1190
1191 if (x && x->km.state == XFRM_STATE_VALID) {
1192 xfrm[nx++] = x;
1193 daddr = remote;
1194 saddr = local;
1195 continue;
1196 }
1197 if (x) {
1198 error = (x->km.state == XFRM_STATE_ERROR ?
1199 -EINVAL : -EAGAIN);
1200 xfrm_state_put(x);
1201 }
1202 else if (error == -ESRCH)
1203 error = -EAGAIN;
1204
1205 if (!tmpl->optional)
1206 goto fail;
1207 }
1208 return nx;
1209
1210 fail:
1211 for (nx--; nx>=0; nx--)
1212 xfrm_state_put(xfrm[nx]);
1213 return error;
1214 }
1215
1216 static int
1217 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1218 struct xfrm_state **xfrm,
1219 unsigned short family)
1220 {
1221 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1222 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1223 int cnx = 0;
1224 int error;
1225 int ret;
1226 int i;
1227
1228 for (i = 0; i < npols; i++) {
1229 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1230 error = -ENOBUFS;
1231 goto fail;
1232 }
1233
1234 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1235 if (ret < 0) {
1236 error = ret;
1237 goto fail;
1238 } else
1239 cnx += ret;
1240 }
1241
1242 /* found states are sorted for outbound processing */
1243 if (npols > 1)
1244 xfrm_state_sort(xfrm, tpp, cnx, family);
1245
1246 return cnx;
1247
1248 fail:
1249 for (cnx--; cnx>=0; cnx--)
1250 xfrm_state_put(tpp[cnx]);
1251 return error;
1252
1253 }
1254
1255 /* Check that the bundle accepts the flow and its components are
1256 * still valid.
1257 */
1258
1259 static inline int xfrm_get_tos(struct flowi *fl, int family)
1260 {
1261 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1262 int tos;
1263
1264 if (!afinfo)
1265 return -EINVAL;
1266
1267 tos = afinfo->get_tos(fl);
1268
1269 xfrm_policy_put_afinfo(afinfo);
1270
1271 return tos;
1272 }
1273
1274 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1275 {
1276 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1277 struct dst_entry *dst = &xdst->u.dst;
1278
1279 if (xdst->route == NULL) {
1280 /* Dummy bundle - if it has xfrms we were not
1281 * able to build bundle as template resolution failed.
1282 * It means we need to try again resolving. */
1283 if (xdst->num_xfrms > 0)
1284 return NULL;
1285 } else {
1286 /* Real bundle */
1287 if (stale_bundle(dst))
1288 return NULL;
1289 }
1290
1291 dst_hold(dst);
1292 return flo;
1293 }
1294
1295 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1296 {
1297 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1298 struct dst_entry *dst = &xdst->u.dst;
1299
1300 if (!xdst->route)
1301 return 0;
1302 if (stale_bundle(dst))
1303 return 0;
1304
1305 return 1;
1306 }
1307
1308 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1309 {
1310 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1311 struct dst_entry *dst = &xdst->u.dst;
1312
1313 dst_free(dst);
1314 }
1315
1316 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1317 .get = xfrm_bundle_flo_get,
1318 .check = xfrm_bundle_flo_check,
1319 .delete = xfrm_bundle_flo_delete,
1320 };
1321
1322 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1323 {
1324 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1325 struct dst_ops *dst_ops;
1326 struct xfrm_dst *xdst;
1327
1328 if (!afinfo)
1329 return ERR_PTR(-EINVAL);
1330
1331 switch (family) {
1332 case AF_INET:
1333 dst_ops = &net->xfrm.xfrm4_dst_ops;
1334 break;
1335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1336 case AF_INET6:
1337 dst_ops = &net->xfrm.xfrm6_dst_ops;
1338 break;
1339 #endif
1340 default:
1341 BUG();
1342 }
1343 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
1344 xfrm_policy_put_afinfo(afinfo);
1345
1346 xdst->flo.ops = &xfrm_bundle_fc_ops;
1347
1348 return xdst;
1349 }
1350
1351 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1352 int nfheader_len)
1353 {
1354 struct xfrm_policy_afinfo *afinfo =
1355 xfrm_policy_get_afinfo(dst->ops->family);
1356 int err;
1357
1358 if (!afinfo)
1359 return -EINVAL;
1360
1361 err = afinfo->init_path(path, dst, nfheader_len);
1362
1363 xfrm_policy_put_afinfo(afinfo);
1364
1365 return err;
1366 }
1367
1368 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1369 struct flowi *fl)
1370 {
1371 struct xfrm_policy_afinfo *afinfo =
1372 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1373 int err;
1374
1375 if (!afinfo)
1376 return -EINVAL;
1377
1378 err = afinfo->fill_dst(xdst, dev, fl);
1379
1380 xfrm_policy_put_afinfo(afinfo);
1381
1382 return err;
1383 }
1384
1385
1386 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1387 * all the metrics... Shortly, bundle a bundle.
1388 */
1389
1390 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1391 struct xfrm_state **xfrm, int nx,
1392 struct flowi *fl,
1393 struct dst_entry *dst)
1394 {
1395 struct net *net = xp_net(policy);
1396 unsigned long now = jiffies;
1397 struct net_device *dev;
1398 struct dst_entry *dst_prev = NULL;
1399 struct dst_entry *dst0 = NULL;
1400 int i = 0;
1401 int err;
1402 int header_len = 0;
1403 int nfheader_len = 0;
1404 int trailer_len = 0;
1405 int tos;
1406 int family = policy->selector.family;
1407 xfrm_address_t saddr, daddr;
1408
1409 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1410
1411 tos = xfrm_get_tos(fl, family);
1412 err = tos;
1413 if (tos < 0)
1414 goto put_states;
1415
1416 dst_hold(dst);
1417
1418 for (; i < nx; i++) {
1419 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1420 struct dst_entry *dst1 = &xdst->u.dst;
1421
1422 err = PTR_ERR(xdst);
1423 if (IS_ERR(xdst)) {
1424 dst_release(dst);
1425 goto put_states;
1426 }
1427
1428 if (!dst_prev)
1429 dst0 = dst1;
1430 else {
1431 dst_prev->child = dst_clone(dst1);
1432 dst1->flags |= DST_NOHASH;
1433 }
1434
1435 xdst->route = dst;
1436 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1437
1438 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1439 family = xfrm[i]->props.family;
1440 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1441 family);
1442 err = PTR_ERR(dst);
1443 if (IS_ERR(dst))
1444 goto put_states;
1445 } else
1446 dst_hold(dst);
1447
1448 dst1->xfrm = xfrm[i];
1449 xdst->xfrm_genid = xfrm[i]->genid;
1450
1451 dst1->obsolete = -1;
1452 dst1->flags |= DST_HOST;
1453 dst1->lastuse = now;
1454
1455 dst1->input = dst_discard;
1456 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1457
1458 dst1->next = dst_prev;
1459 dst_prev = dst1;
1460
1461 header_len += xfrm[i]->props.header_len;
1462 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1463 nfheader_len += xfrm[i]->props.header_len;
1464 trailer_len += xfrm[i]->props.trailer_len;
1465 }
1466
1467 dst_prev->child = dst;
1468 dst0->path = dst;
1469
1470 err = -ENODEV;
1471 dev = dst->dev;
1472 if (!dev)
1473 goto free_dst;
1474
1475 /* Copy neighbour for reachability confirmation */
1476 dst0->neighbour = neigh_clone(dst->neighbour);
1477
1478 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1479 xfrm_init_pmtu(dst_prev);
1480
1481 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1482 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1483
1484 err = xfrm_fill_dst(xdst, dev, fl);
1485 if (err)
1486 goto free_dst;
1487
1488 dst_prev->header_len = header_len;
1489 dst_prev->trailer_len = trailer_len;
1490 header_len -= xdst->u.dst.xfrm->props.header_len;
1491 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1492 }
1493
1494 out:
1495 return dst0;
1496
1497 put_states:
1498 for (; i < nx; i++)
1499 xfrm_state_put(xfrm[i]);
1500 free_dst:
1501 if (dst0)
1502 dst_free(dst0);
1503 dst0 = ERR_PTR(err);
1504 goto out;
1505 }
1506
1507 static int inline
1508 xfrm_dst_alloc_copy(void **target, void *src, int size)
1509 {
1510 if (!*target) {
1511 *target = kmalloc(size, GFP_ATOMIC);
1512 if (!*target)
1513 return -ENOMEM;
1514 }
1515 memcpy(*target, src, size);
1516 return 0;
1517 }
1518
1519 static int inline
1520 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1521 {
1522 #ifdef CONFIG_XFRM_SUB_POLICY
1523 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1524 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1525 sel, sizeof(*sel));
1526 #else
1527 return 0;
1528 #endif
1529 }
1530
1531 static int inline
1532 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1533 {
1534 #ifdef CONFIG_XFRM_SUB_POLICY
1535 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1536 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1537 #else
1538 return 0;
1539 #endif
1540 }
1541
1542 static int xfrm_expand_policies(struct flowi *fl, u16 family,
1543 struct xfrm_policy **pols,
1544 int *num_pols, int *num_xfrms)
1545 {
1546 int i;
1547
1548 if (*num_pols == 0 || !pols[0]) {
1549 *num_pols = 0;
1550 *num_xfrms = 0;
1551 return 0;
1552 }
1553 if (IS_ERR(pols[0]))
1554 return PTR_ERR(pols[0]);
1555
1556 *num_xfrms = pols[0]->xfrm_nr;
1557
1558 #ifdef CONFIG_XFRM_SUB_POLICY
1559 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1560 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1561 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1562 XFRM_POLICY_TYPE_MAIN,
1563 fl, family,
1564 XFRM_POLICY_OUT);
1565 if (pols[1]) {
1566 if (IS_ERR(pols[1])) {
1567 xfrm_pols_put(pols, *num_pols);
1568 return PTR_ERR(pols[1]);
1569 }
1570 (*num_pols) ++;
1571 (*num_xfrms) += pols[1]->xfrm_nr;
1572 }
1573 }
1574 #endif
1575 for (i = 0; i < *num_pols; i++) {
1576 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1577 *num_xfrms = -1;
1578 break;
1579 }
1580 }
1581
1582 return 0;
1583
1584 }
1585
1586 static struct xfrm_dst *
1587 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1588 struct flowi *fl, u16 family,
1589 struct dst_entry *dst_orig)
1590 {
1591 struct net *net = xp_net(pols[0]);
1592 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1593 struct dst_entry *dst;
1594 struct xfrm_dst *xdst;
1595 int err;
1596
1597 /* Try to instantiate a bundle */
1598 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1599 if (err <= 0) {
1600 if (err != 0 && err != -EAGAIN)
1601 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1602 return ERR_PTR(err);
1603 }
1604
1605 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1606 if (IS_ERR(dst)) {
1607 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1608 return ERR_CAST(dst);
1609 }
1610
1611 xdst = (struct xfrm_dst *)dst;
1612 xdst->num_xfrms = err;
1613 if (num_pols > 1)
1614 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1615 else
1616 err = xfrm_dst_update_origin(dst, fl);
1617 if (unlikely(err)) {
1618 dst_free(dst);
1619 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1620 return ERR_PTR(err);
1621 }
1622
1623 xdst->num_pols = num_pols;
1624 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1625 xdst->policy_genid = atomic_read(&pols[0]->genid);
1626
1627 return xdst;
1628 }
1629
1630 static struct flow_cache_object *
1631 xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1632 struct flow_cache_object *oldflo, void *ctx)
1633 {
1634 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1635 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1636 struct xfrm_dst *xdst, *new_xdst;
1637 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1638
1639 /* Check if the policies from old bundle are usable */
1640 xdst = NULL;
1641 if (oldflo) {
1642 xdst = container_of(oldflo, struct xfrm_dst, flo);
1643 num_pols = xdst->num_pols;
1644 num_xfrms = xdst->num_xfrms;
1645 pol_dead = 0;
1646 for (i = 0; i < num_pols; i++) {
1647 pols[i] = xdst->pols[i];
1648 pol_dead |= pols[i]->walk.dead;
1649 }
1650 if (pol_dead) {
1651 dst_free(&xdst->u.dst);
1652 xdst = NULL;
1653 num_pols = 0;
1654 num_xfrms = 0;
1655 oldflo = NULL;
1656 }
1657 }
1658
1659 /* Resolve policies to use if we couldn't get them from
1660 * previous cache entry */
1661 if (xdst == NULL) {
1662 num_pols = 1;
1663 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1664 err = xfrm_expand_policies(fl, family, pols,
1665 &num_pols, &num_xfrms);
1666 if (err < 0)
1667 goto inc_error;
1668 if (num_pols == 0)
1669 return NULL;
1670 if (num_xfrms <= 0)
1671 goto make_dummy_bundle;
1672 }
1673
1674 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1675 if (IS_ERR(new_xdst)) {
1676 err = PTR_ERR(new_xdst);
1677 if (err != -EAGAIN)
1678 goto error;
1679 if (oldflo == NULL)
1680 goto make_dummy_bundle;
1681 dst_hold(&xdst->u.dst);
1682 return oldflo;
1683 } else if (new_xdst == NULL) {
1684 num_xfrms = 0;
1685 if (oldflo == NULL)
1686 goto make_dummy_bundle;
1687 xdst->num_xfrms = 0;
1688 dst_hold(&xdst->u.dst);
1689 return oldflo;
1690 }
1691
1692 /* Kill the previous bundle */
1693 if (xdst) {
1694 /* The policies were stolen for newly generated bundle */
1695 xdst->num_pols = 0;
1696 dst_free(&xdst->u.dst);
1697 }
1698
1699 /* Flow cache does not have reference, it dst_free()'s,
1700 * but we do need to return one reference for original caller */
1701 dst_hold(&new_xdst->u.dst);
1702 return &new_xdst->flo;
1703
1704 make_dummy_bundle:
1705 /* We found policies, but there's no bundles to instantiate:
1706 * either because the policy blocks, has no transformations or
1707 * we could not build template (no xfrm_states).*/
1708 xdst = xfrm_alloc_dst(net, family);
1709 if (IS_ERR(xdst)) {
1710 xfrm_pols_put(pols, num_pols);
1711 return ERR_CAST(xdst);
1712 }
1713 xdst->num_pols = num_pols;
1714 xdst->num_xfrms = num_xfrms;
1715 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1716
1717 dst_hold(&xdst->u.dst);
1718 return &xdst->flo;
1719
1720 inc_error:
1721 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1722 error:
1723 if (xdst != NULL)
1724 dst_free(&xdst->u.dst);
1725 else
1726 xfrm_pols_put(pols, num_pols);
1727 return ERR_PTR(err);
1728 }
1729
1730 /* Main function: finds/creates a bundle for given flow.
1731 *
1732 * At the moment we eat a raw IP route. Mostly to speed up lookups
1733 * on interfaces with disabled IPsec.
1734 */
1735 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1736 struct sock *sk, int flags)
1737 {
1738 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1739 struct flow_cache_object *flo;
1740 struct xfrm_dst *xdst;
1741 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1742 u16 family = dst_orig->ops->family;
1743 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1744 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1745
1746 restart:
1747 dst = NULL;
1748 xdst = NULL;
1749 route = NULL;
1750
1751 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1752 num_pols = 1;
1753 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1754 err = xfrm_expand_policies(fl, family, pols,
1755 &num_pols, &num_xfrms);
1756 if (err < 0)
1757 goto dropdst;
1758
1759 if (num_pols) {
1760 if (num_xfrms <= 0) {
1761 drop_pols = num_pols;
1762 goto no_transform;
1763 }
1764
1765 xdst = xfrm_resolve_and_create_bundle(
1766 pols, num_pols, fl,
1767 family, dst_orig);
1768 if (IS_ERR(xdst)) {
1769 xfrm_pols_put(pols, num_pols);
1770 err = PTR_ERR(xdst);
1771 goto dropdst;
1772 } else if (xdst == NULL) {
1773 num_xfrms = 0;
1774 drop_pols = num_pols;
1775 goto no_transform;
1776 }
1777
1778 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1779 xdst->u.dst.next = xfrm_policy_sk_bundles;
1780 xfrm_policy_sk_bundles = &xdst->u.dst;
1781 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1782
1783 route = xdst->route;
1784 }
1785 }
1786
1787 if (xdst == NULL) {
1788 /* To accelerate a bit... */
1789 if ((dst_orig->flags & DST_NOXFRM) ||
1790 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1791 goto nopol;
1792
1793 flo = flow_cache_lookup(net, fl, family, dir,
1794 xfrm_bundle_lookup, dst_orig);
1795 if (flo == NULL)
1796 goto nopol;
1797 if (IS_ERR(flo)) {
1798 err = PTR_ERR(flo);
1799 goto dropdst;
1800 }
1801 xdst = container_of(flo, struct xfrm_dst, flo);
1802
1803 num_pols = xdst->num_pols;
1804 num_xfrms = xdst->num_xfrms;
1805 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1806 route = xdst->route;
1807 }
1808
1809 dst = &xdst->u.dst;
1810 if (route == NULL && num_xfrms > 0) {
1811 /* The only case when xfrm_bundle_lookup() returns a
1812 * bundle with null route, is when the template could
1813 * not be resolved. It means policies are there, but
1814 * bundle could not be created, since we don't yet
1815 * have the xfrm_state's. We need to wait for KM to
1816 * negotiate new SA's or bail out with error.*/
1817 if (net->xfrm.sysctl_larval_drop) {
1818 /* EREMOTE tells the caller to generate
1819 * a one-shot blackhole route. */
1820 dst_release(dst);
1821 xfrm_pols_put(pols, drop_pols);
1822 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1823 return -EREMOTE;
1824 }
1825 if (flags & XFRM_LOOKUP_WAIT) {
1826 DECLARE_WAITQUEUE(wait, current);
1827
1828 add_wait_queue(&net->xfrm.km_waitq, &wait);
1829 set_current_state(TASK_INTERRUPTIBLE);
1830 schedule();
1831 set_current_state(TASK_RUNNING);
1832 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1833
1834 if (!signal_pending(current)) {
1835 dst_release(dst);
1836 goto restart;
1837 }
1838
1839 err = -ERESTART;
1840 } else
1841 err = -EAGAIN;
1842
1843 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1844 goto error;
1845 }
1846
1847 no_transform:
1848 if (num_pols == 0)
1849 goto nopol;
1850
1851 if ((flags & XFRM_LOOKUP_ICMP) &&
1852 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1853 err = -ENOENT;
1854 goto error;
1855 }
1856
1857 for (i = 0; i < num_pols; i++)
1858 pols[i]->curlft.use_time = get_seconds();
1859
1860 if (num_xfrms < 0) {
1861 /* Prohibit the flow */
1862 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1863 err = -EPERM;
1864 goto error;
1865 } else if (num_xfrms > 0) {
1866 /* Flow transformed */
1867 *dst_p = dst;
1868 dst_release(dst_orig);
1869 } else {
1870 /* Flow passes untransformed */
1871 dst_release(dst);
1872 }
1873 ok:
1874 xfrm_pols_put(pols, drop_pols);
1875 return 0;
1876
1877 nopol:
1878 if (!(flags & XFRM_LOOKUP_ICMP))
1879 goto ok;
1880 err = -ENOENT;
1881 error:
1882 dst_release(dst);
1883 dropdst:
1884 dst_release(dst_orig);
1885 *dst_p = NULL;
1886 xfrm_pols_put(pols, drop_pols);
1887 return err;
1888 }
1889 EXPORT_SYMBOL(__xfrm_lookup);
1890
1891 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1892 struct sock *sk, int flags)
1893 {
1894 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1895
1896 if (err == -EREMOTE) {
1897 dst_release(*dst_p);
1898 *dst_p = NULL;
1899 err = -EAGAIN;
1900 }
1901
1902 return err;
1903 }
1904 EXPORT_SYMBOL(xfrm_lookup);
1905
1906 static inline int
1907 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1908 {
1909 struct xfrm_state *x;
1910
1911 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1912 return 0;
1913 x = skb->sp->xvec[idx];
1914 if (!x->type->reject)
1915 return 0;
1916 return x->type->reject(x, skb, fl);
1917 }
1918
1919 /* When skb is transformed back to its "native" form, we have to
1920 * check policy restrictions. At the moment we make this in maximally
1921 * stupid way. Shame on me. :-) Of course, connected sockets must
1922 * have policy cached at them.
1923 */
1924
1925 static inline int
1926 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1927 unsigned short family)
1928 {
1929 if (xfrm_state_kern(x))
1930 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1931 return x->id.proto == tmpl->id.proto &&
1932 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1933 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1934 x->props.mode == tmpl->mode &&
1935 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1936 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1937 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1938 xfrm_state_addr_cmp(tmpl, x, family));
1939 }
1940
1941 /*
1942 * 0 or more than 0 is returned when validation is succeeded (either bypass
1943 * because of optional transport mode, or next index of the mathced secpath
1944 * state with the template.
1945 * -1 is returned when no matching template is found.
1946 * Otherwise "-2 - errored_index" is returned.
1947 */
1948 static inline int
1949 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1950 unsigned short family)
1951 {
1952 int idx = start;
1953
1954 if (tmpl->optional) {
1955 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1956 return start;
1957 } else
1958 start = -1;
1959 for (; idx < sp->len; idx++) {
1960 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1961 return ++idx;
1962 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1963 if (start == -1)
1964 start = -2-idx;
1965 break;
1966 }
1967 }
1968 return start;
1969 }
1970
1971 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1972 unsigned int family, int reverse)
1973 {
1974 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1975 int err;
1976
1977 if (unlikely(afinfo == NULL))
1978 return -EAFNOSUPPORT;
1979
1980 afinfo->decode_session(skb, fl, reverse);
1981 err = security_xfrm_decode_session(skb, &fl->secid);
1982 xfrm_policy_put_afinfo(afinfo);
1983 return err;
1984 }
1985 EXPORT_SYMBOL(__xfrm_decode_session);
1986
1987 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1988 {
1989 for (; k < sp->len; k++) {
1990 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1991 *idxp = k;
1992 return 1;
1993 }
1994 }
1995
1996 return 0;
1997 }
1998
1999 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2000 unsigned short family)
2001 {
2002 struct net *net = dev_net(skb->dev);
2003 struct xfrm_policy *pol;
2004 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2005 int npols = 0;
2006 int xfrm_nr;
2007 int pi;
2008 int reverse;
2009 struct flowi fl;
2010 u8 fl_dir;
2011 int xerr_idx = -1;
2012
2013 reverse = dir & ~XFRM_POLICY_MASK;
2014 dir &= XFRM_POLICY_MASK;
2015 fl_dir = policy_to_flow_dir(dir);
2016
2017 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2018 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2019 return 0;
2020 }
2021
2022 nf_nat_decode_session(skb, &fl, family);
2023
2024 /* First, check used SA against their selectors. */
2025 if (skb->sp) {
2026 int i;
2027
2028 for (i=skb->sp->len-1; i>=0; i--) {
2029 struct xfrm_state *x = skb->sp->xvec[i];
2030 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2031 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2032 return 0;
2033 }
2034 }
2035 }
2036
2037 pol = NULL;
2038 if (sk && sk->sk_policy[dir]) {
2039 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2040 if (IS_ERR(pol)) {
2041 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2042 return 0;
2043 }
2044 }
2045
2046 if (!pol) {
2047 struct flow_cache_object *flo;
2048
2049 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2050 xfrm_policy_lookup, NULL);
2051 if (IS_ERR_OR_NULL(flo))
2052 pol = ERR_CAST(flo);
2053 else
2054 pol = container_of(flo, struct xfrm_policy, flo);
2055 }
2056
2057 if (IS_ERR(pol)) {
2058 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2059 return 0;
2060 }
2061
2062 if (!pol) {
2063 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2064 xfrm_secpath_reject(xerr_idx, skb, &fl);
2065 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2066 return 0;
2067 }
2068 return 1;
2069 }
2070
2071 pol->curlft.use_time = get_seconds();
2072
2073 pols[0] = pol;
2074 npols ++;
2075 #ifdef CONFIG_XFRM_SUB_POLICY
2076 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2077 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2078 &fl, family,
2079 XFRM_POLICY_IN);
2080 if (pols[1]) {
2081 if (IS_ERR(pols[1])) {
2082 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2083 return 0;
2084 }
2085 pols[1]->curlft.use_time = get_seconds();
2086 npols ++;
2087 }
2088 }
2089 #endif
2090
2091 if (pol->action == XFRM_POLICY_ALLOW) {
2092 struct sec_path *sp;
2093 static struct sec_path dummy;
2094 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2095 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2096 struct xfrm_tmpl **tpp = tp;
2097 int ti = 0;
2098 int i, k;
2099
2100 if ((sp = skb->sp) == NULL)
2101 sp = &dummy;
2102
2103 for (pi = 0; pi < npols; pi++) {
2104 if (pols[pi] != pol &&
2105 pols[pi]->action != XFRM_POLICY_ALLOW) {
2106 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2107 goto reject;
2108 }
2109 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2110 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2111 goto reject_error;
2112 }
2113 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2114 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2115 }
2116 xfrm_nr = ti;
2117 if (npols > 1) {
2118 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2119 tpp = stp;
2120 }
2121
2122 /* For each tunnel xfrm, find the first matching tmpl.
2123 * For each tmpl before that, find corresponding xfrm.
2124 * Order is _important_. Later we will implement
2125 * some barriers, but at the moment barriers
2126 * are implied between each two transformations.
2127 */
2128 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2129 k = xfrm_policy_ok(tpp[i], sp, k, family);
2130 if (k < 0) {
2131 if (k < -1)
2132 /* "-2 - errored_index" returned */
2133 xerr_idx = -(2+k);
2134 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2135 goto reject;
2136 }
2137 }
2138
2139 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2140 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2141 goto reject;
2142 }
2143
2144 xfrm_pols_put(pols, npols);
2145 return 1;
2146 }
2147 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2148
2149 reject:
2150 xfrm_secpath_reject(xerr_idx, skb, &fl);
2151 reject_error:
2152 xfrm_pols_put(pols, npols);
2153 return 0;
2154 }
2155 EXPORT_SYMBOL(__xfrm_policy_check);
2156
2157 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2158 {
2159 struct net *net = dev_net(skb->dev);
2160 struct flowi fl;
2161 struct dst_entry *dst;
2162 int res;
2163
2164 if (xfrm_decode_session(skb, &fl, family) < 0) {
2165 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2166 return 0;
2167 }
2168
2169 skb_dst_force(skb);
2170 dst = skb_dst(skb);
2171
2172 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2173 skb_dst_set(skb, dst);
2174 return res;
2175 }
2176 EXPORT_SYMBOL(__xfrm_route_forward);
2177
2178 /* Optimize later using cookies and generation ids. */
2179
2180 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2181 {
2182 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2183 * to "-1" to force all XFRM destinations to get validated by
2184 * dst_ops->check on every use. We do this because when a
2185 * normal route referenced by an XFRM dst is obsoleted we do
2186 * not go looking around for all parent referencing XFRM dsts
2187 * so that we can invalidate them. It is just too much work.
2188 * Instead we make the checks here on every use. For example:
2189 *
2190 * XFRM dst A --> IPv4 dst X
2191 *
2192 * X is the "xdst->route" of A (X is also the "dst->path" of A
2193 * in this example). If X is marked obsolete, "A" will not
2194 * notice. That's what we are validating here via the
2195 * stale_bundle() check.
2196 *
2197 * When a policy's bundle is pruned, we dst_free() the XFRM
2198 * dst which causes it's ->obsolete field to be set to a
2199 * positive non-zero integer. If an XFRM dst has been pruned
2200 * like this, we want to force a new route lookup.
2201 */
2202 if (dst->obsolete < 0 && !stale_bundle(dst))
2203 return dst;
2204
2205 return NULL;
2206 }
2207
2208 static int stale_bundle(struct dst_entry *dst)
2209 {
2210 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2211 }
2212
2213 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2214 {
2215 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2216 dst->dev = dev_net(dev)->loopback_dev;
2217 dev_hold(dst->dev);
2218 dev_put(dev);
2219 }
2220 }
2221 EXPORT_SYMBOL(xfrm_dst_ifdown);
2222
2223 static void xfrm_link_failure(struct sk_buff *skb)
2224 {
2225 /* Impossible. Such dst must be popped before reaches point of failure. */
2226 }
2227
2228 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2229 {
2230 if (dst) {
2231 if (dst->obsolete) {
2232 dst_release(dst);
2233 dst = NULL;
2234 }
2235 }
2236 return dst;
2237 }
2238
2239 static void __xfrm_garbage_collect(struct net *net)
2240 {
2241 struct dst_entry *head, *next;
2242
2243 flow_cache_flush();
2244
2245 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2246 head = xfrm_policy_sk_bundles;
2247 xfrm_policy_sk_bundles = NULL;
2248 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2249
2250 while (head) {
2251 next = head->next;
2252 dst_free(head);
2253 head = next;
2254 }
2255 }
2256
2257 static void xfrm_init_pmtu(struct dst_entry *dst)
2258 {
2259 do {
2260 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2261 u32 pmtu, route_mtu_cached;
2262
2263 pmtu = dst_mtu(dst->child);
2264 xdst->child_mtu_cached = pmtu;
2265
2266 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2267
2268 route_mtu_cached = dst_mtu(xdst->route);
2269 xdst->route_mtu_cached = route_mtu_cached;
2270
2271 if (pmtu > route_mtu_cached)
2272 pmtu = route_mtu_cached;
2273
2274 dst->metrics[RTAX_MTU-1] = pmtu;
2275 } while ((dst = dst->next));
2276 }
2277
2278 /* Check that the bundle accepts the flow and its components are
2279 * still valid.
2280 */
2281
2282 static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2283 struct flowi *fl, int family, int strict)
2284 {
2285 struct dst_entry *dst = &first->u.dst;
2286 struct xfrm_dst *last;
2287 u32 mtu;
2288
2289 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2290 (dst->dev && !netif_running(dst->dev)))
2291 return 0;
2292 #ifdef CONFIG_XFRM_SUB_POLICY
2293 if (fl) {
2294 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2295 return 0;
2296 if (first->partner &&
2297 !xfrm_selector_match(first->partner, fl, family))
2298 return 0;
2299 }
2300 #endif
2301
2302 last = NULL;
2303
2304 do {
2305 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2306
2307 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2308 return 0;
2309 if (fl && pol &&
2310 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2311 return 0;
2312 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2313 return 0;
2314 if (xdst->xfrm_genid != dst->xfrm->genid)
2315 return 0;
2316 if (xdst->num_pols > 0 &&
2317 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2318 return 0;
2319
2320 if (strict && fl &&
2321 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2322 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2323 return 0;
2324
2325 mtu = dst_mtu(dst->child);
2326 if (xdst->child_mtu_cached != mtu) {
2327 last = xdst;
2328 xdst->child_mtu_cached = mtu;
2329 }
2330
2331 if (!dst_check(xdst->route, xdst->route_cookie))
2332 return 0;
2333 mtu = dst_mtu(xdst->route);
2334 if (xdst->route_mtu_cached != mtu) {
2335 last = xdst;
2336 xdst->route_mtu_cached = mtu;
2337 }
2338
2339 dst = dst->child;
2340 } while (dst->xfrm);
2341
2342 if (likely(!last))
2343 return 1;
2344
2345 mtu = last->child_mtu_cached;
2346 for (;;) {
2347 dst = &last->u.dst;
2348
2349 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2350 if (mtu > last->route_mtu_cached)
2351 mtu = last->route_mtu_cached;
2352 dst->metrics[RTAX_MTU-1] = mtu;
2353
2354 if (last == first)
2355 break;
2356
2357 last = (struct xfrm_dst *)last->u.dst.next;
2358 last->child_mtu_cached = mtu;
2359 }
2360
2361 return 1;
2362 }
2363
2364 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2365 {
2366 struct net *net;
2367 int err = 0;
2368 if (unlikely(afinfo == NULL))
2369 return -EINVAL;
2370 if (unlikely(afinfo->family >= NPROTO))
2371 return -EAFNOSUPPORT;
2372 write_lock_bh(&xfrm_policy_afinfo_lock);
2373 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2374 err = -ENOBUFS;
2375 else {
2376 struct dst_ops *dst_ops = afinfo->dst_ops;
2377 if (likely(dst_ops->kmem_cachep == NULL))
2378 dst_ops->kmem_cachep = xfrm_dst_cache;
2379 if (likely(dst_ops->check == NULL))
2380 dst_ops->check = xfrm_dst_check;
2381 if (likely(dst_ops->negative_advice == NULL))
2382 dst_ops->negative_advice = xfrm_negative_advice;
2383 if (likely(dst_ops->link_failure == NULL))
2384 dst_ops->link_failure = xfrm_link_failure;
2385 if (likely(afinfo->garbage_collect == NULL))
2386 afinfo->garbage_collect = __xfrm_garbage_collect;
2387 xfrm_policy_afinfo[afinfo->family] = afinfo;
2388 }
2389 write_unlock_bh(&xfrm_policy_afinfo_lock);
2390
2391 rtnl_lock();
2392 for_each_net(net) {
2393 struct dst_ops *xfrm_dst_ops;
2394
2395 switch (afinfo->family) {
2396 case AF_INET:
2397 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2398 break;
2399 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2400 case AF_INET6:
2401 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2402 break;
2403 #endif
2404 default:
2405 BUG();
2406 }
2407 *xfrm_dst_ops = *afinfo->dst_ops;
2408 }
2409 rtnl_unlock();
2410
2411 return err;
2412 }
2413 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2414
2415 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2416 {
2417 int err = 0;
2418 if (unlikely(afinfo == NULL))
2419 return -EINVAL;
2420 if (unlikely(afinfo->family >= NPROTO))
2421 return -EAFNOSUPPORT;
2422 write_lock_bh(&xfrm_policy_afinfo_lock);
2423 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2424 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2425 err = -EINVAL;
2426 else {
2427 struct dst_ops *dst_ops = afinfo->dst_ops;
2428 xfrm_policy_afinfo[afinfo->family] = NULL;
2429 dst_ops->kmem_cachep = NULL;
2430 dst_ops->check = NULL;
2431 dst_ops->negative_advice = NULL;
2432 dst_ops->link_failure = NULL;
2433 afinfo->garbage_collect = NULL;
2434 }
2435 }
2436 write_unlock_bh(&xfrm_policy_afinfo_lock);
2437 return err;
2438 }
2439 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2440
2441 static void __net_init xfrm_dst_ops_init(struct net *net)
2442 {
2443 struct xfrm_policy_afinfo *afinfo;
2444
2445 read_lock_bh(&xfrm_policy_afinfo_lock);
2446 afinfo = xfrm_policy_afinfo[AF_INET];
2447 if (afinfo)
2448 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2450 afinfo = xfrm_policy_afinfo[AF_INET6];
2451 if (afinfo)
2452 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2453 #endif
2454 read_unlock_bh(&xfrm_policy_afinfo_lock);
2455 }
2456
2457 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2458 {
2459 struct xfrm_policy_afinfo *afinfo;
2460 if (unlikely(family >= NPROTO))
2461 return NULL;
2462 read_lock(&xfrm_policy_afinfo_lock);
2463 afinfo = xfrm_policy_afinfo[family];
2464 if (unlikely(!afinfo))
2465 read_unlock(&xfrm_policy_afinfo_lock);
2466 return afinfo;
2467 }
2468
2469 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2470 {
2471 read_unlock(&xfrm_policy_afinfo_lock);
2472 }
2473
2474 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2475 {
2476 struct net_device *dev = ptr;
2477
2478 switch (event) {
2479 case NETDEV_DOWN:
2480 __xfrm_garbage_collect(dev_net(dev));
2481 }
2482 return NOTIFY_DONE;
2483 }
2484
2485 static struct notifier_block xfrm_dev_notifier = {
2486 .notifier_call = xfrm_dev_event,
2487 };
2488
2489 #ifdef CONFIG_XFRM_STATISTICS
2490 static int __net_init xfrm_statistics_init(struct net *net)
2491 {
2492 int rv;
2493
2494 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2495 sizeof(struct linux_xfrm_mib),
2496 __alignof__(struct linux_xfrm_mib)) < 0)
2497 return -ENOMEM;
2498 rv = xfrm_proc_init(net);
2499 if (rv < 0)
2500 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2501 return rv;
2502 }
2503
2504 static void xfrm_statistics_fini(struct net *net)
2505 {
2506 xfrm_proc_fini(net);
2507 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2508 }
2509 #else
2510 static int __net_init xfrm_statistics_init(struct net *net)
2511 {
2512 return 0;
2513 }
2514
2515 static void xfrm_statistics_fini(struct net *net)
2516 {
2517 }
2518 #endif
2519
2520 static int __net_init xfrm_policy_init(struct net *net)
2521 {
2522 unsigned int hmask, sz;
2523 int dir;
2524
2525 if (net_eq(net, &init_net))
2526 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2527 sizeof(struct xfrm_dst),
2528 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2529 NULL);
2530
2531 hmask = 8 - 1;
2532 sz = (hmask+1) * sizeof(struct hlist_head);
2533
2534 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2535 if (!net->xfrm.policy_byidx)
2536 goto out_byidx;
2537 net->xfrm.policy_idx_hmask = hmask;
2538
2539 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2540 struct xfrm_policy_hash *htab;
2541
2542 net->xfrm.policy_count[dir] = 0;
2543 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2544
2545 htab = &net->xfrm.policy_bydst[dir];
2546 htab->table = xfrm_hash_alloc(sz);
2547 if (!htab->table)
2548 goto out_bydst;
2549 htab->hmask = hmask;
2550 }
2551
2552 INIT_LIST_HEAD(&net->xfrm.policy_all);
2553 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2554 if (net_eq(net, &init_net))
2555 register_netdevice_notifier(&xfrm_dev_notifier);
2556 return 0;
2557
2558 out_bydst:
2559 for (dir--; dir >= 0; dir--) {
2560 struct xfrm_policy_hash *htab;
2561
2562 htab = &net->xfrm.policy_bydst[dir];
2563 xfrm_hash_free(htab->table, sz);
2564 }
2565 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2566 out_byidx:
2567 return -ENOMEM;
2568 }
2569
2570 static void xfrm_policy_fini(struct net *net)
2571 {
2572 struct xfrm_audit audit_info;
2573 unsigned int sz;
2574 int dir;
2575
2576 flush_work(&net->xfrm.policy_hash_work);
2577 #ifdef CONFIG_XFRM_SUB_POLICY
2578 audit_info.loginuid = -1;
2579 audit_info.sessionid = -1;
2580 audit_info.secid = 0;
2581 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2582 #endif
2583 audit_info.loginuid = -1;
2584 audit_info.sessionid = -1;
2585 audit_info.secid = 0;
2586 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2587
2588 WARN_ON(!list_empty(&net->xfrm.policy_all));
2589
2590 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2591 struct xfrm_policy_hash *htab;
2592
2593 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2594
2595 htab = &net->xfrm.policy_bydst[dir];
2596 sz = (htab->hmask + 1);
2597 WARN_ON(!hlist_empty(htab->table));
2598 xfrm_hash_free(htab->table, sz);
2599 }
2600
2601 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2602 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2603 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2604 }
2605
2606 static int __net_init xfrm_net_init(struct net *net)
2607 {
2608 int rv;
2609
2610 rv = xfrm_statistics_init(net);
2611 if (rv < 0)
2612 goto out_statistics;
2613 rv = xfrm_state_init(net);
2614 if (rv < 0)
2615 goto out_state;
2616 rv = xfrm_policy_init(net);
2617 if (rv < 0)
2618 goto out_policy;
2619 xfrm_dst_ops_init(net);
2620 rv = xfrm_sysctl_init(net);
2621 if (rv < 0)
2622 goto out_sysctl;
2623 return 0;
2624
2625 out_sysctl:
2626 xfrm_policy_fini(net);
2627 out_policy:
2628 xfrm_state_fini(net);
2629 out_state:
2630 xfrm_statistics_fini(net);
2631 out_statistics:
2632 return rv;
2633 }
2634
2635 static void __net_exit xfrm_net_exit(struct net *net)
2636 {
2637 xfrm_sysctl_fini(net);
2638 xfrm_policy_fini(net);
2639 xfrm_state_fini(net);
2640 xfrm_statistics_fini(net);
2641 }
2642
2643 static struct pernet_operations __net_initdata xfrm_net_ops = {
2644 .init = xfrm_net_init,
2645 .exit = xfrm_net_exit,
2646 };
2647
2648 void __init xfrm_init(void)
2649 {
2650 register_pernet_subsys(&xfrm_net_ops);
2651 xfrm_input_init();
2652 }
2653
2654 #ifdef CONFIG_AUDITSYSCALL
2655 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2656 struct audit_buffer *audit_buf)
2657 {
2658 struct xfrm_sec_ctx *ctx = xp->security;
2659 struct xfrm_selector *sel = &xp->selector;
2660
2661 if (ctx)
2662 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2663 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2664
2665 switch(sel->family) {
2666 case AF_INET:
2667 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2668 if (sel->prefixlen_s != 32)
2669 audit_log_format(audit_buf, " src_prefixlen=%d",
2670 sel->prefixlen_s);
2671 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2672 if (sel->prefixlen_d != 32)
2673 audit_log_format(audit_buf, " dst_prefixlen=%d",
2674 sel->prefixlen_d);
2675 break;
2676 case AF_INET6:
2677 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2678 if (sel->prefixlen_s != 128)
2679 audit_log_format(audit_buf, " src_prefixlen=%d",
2680 sel->prefixlen_s);
2681 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2682 if (sel->prefixlen_d != 128)
2683 audit_log_format(audit_buf, " dst_prefixlen=%d",
2684 sel->prefixlen_d);
2685 break;
2686 }
2687 }
2688
2689 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2690 uid_t auid, u32 sessionid, u32 secid)
2691 {
2692 struct audit_buffer *audit_buf;
2693
2694 audit_buf = xfrm_audit_start("SPD-add");
2695 if (audit_buf == NULL)
2696 return;
2697 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2698 audit_log_format(audit_buf, " res=%u", result);
2699 xfrm_audit_common_policyinfo(xp, audit_buf);
2700 audit_log_end(audit_buf);
2701 }
2702 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2703
2704 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2705 uid_t auid, u32 sessionid, u32 secid)
2706 {
2707 struct audit_buffer *audit_buf;
2708
2709 audit_buf = xfrm_audit_start("SPD-delete");
2710 if (audit_buf == NULL)
2711 return;
2712 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2713 audit_log_format(audit_buf, " res=%u", result);
2714 xfrm_audit_common_policyinfo(xp, audit_buf);
2715 audit_log_end(audit_buf);
2716 }
2717 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2718 #endif
2719
2720 #ifdef CONFIG_XFRM_MIGRATE
2721 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2722 struct xfrm_selector *sel_tgt)
2723 {
2724 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2725 if (sel_tgt->family == sel_cmp->family &&
2726 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2727 sel_cmp->family) == 0 &&
2728 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2729 sel_cmp->family) == 0 &&
2730 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2731 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2732 return 1;
2733 }
2734 } else {
2735 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2736 return 1;
2737 }
2738 }
2739 return 0;
2740 }
2741
2742 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2743 u8 dir, u8 type)
2744 {
2745 struct xfrm_policy *pol, *ret = NULL;
2746 struct hlist_node *entry;
2747 struct hlist_head *chain;
2748 u32 priority = ~0U;
2749
2750 read_lock_bh(&xfrm_policy_lock);
2751 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2752 hlist_for_each_entry(pol, entry, chain, bydst) {
2753 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2754 pol->type == type) {
2755 ret = pol;
2756 priority = ret->priority;
2757 break;
2758 }
2759 }
2760 chain = &init_net.xfrm.policy_inexact[dir];
2761 hlist_for_each_entry(pol, entry, chain, bydst) {
2762 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2763 pol->type == type &&
2764 pol->priority < priority) {
2765 ret = pol;
2766 break;
2767 }
2768 }
2769
2770 if (ret)
2771 xfrm_pol_hold(ret);
2772
2773 read_unlock_bh(&xfrm_policy_lock);
2774
2775 return ret;
2776 }
2777
2778 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2779 {
2780 int match = 0;
2781
2782 if (t->mode == m->mode && t->id.proto == m->proto &&
2783 (m->reqid == 0 || t->reqid == m->reqid)) {
2784 switch (t->mode) {
2785 case XFRM_MODE_TUNNEL:
2786 case XFRM_MODE_BEET:
2787 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2788 m->old_family) == 0 &&
2789 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2790 m->old_family) == 0) {
2791 match = 1;
2792 }
2793 break;
2794 case XFRM_MODE_TRANSPORT:
2795 /* in case of transport mode, template does not store
2796 any IP addresses, hence we just compare mode and
2797 protocol */
2798 match = 1;
2799 break;
2800 default:
2801 break;
2802 }
2803 }
2804 return match;
2805 }
2806
2807 /* update endpoint address(es) of template(s) */
2808 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2809 struct xfrm_migrate *m, int num_migrate)
2810 {
2811 struct xfrm_migrate *mp;
2812 int i, j, n = 0;
2813
2814 write_lock_bh(&pol->lock);
2815 if (unlikely(pol->walk.dead)) {
2816 /* target policy has been deleted */
2817 write_unlock_bh(&pol->lock);
2818 return -ENOENT;
2819 }
2820
2821 for (i = 0; i < pol->xfrm_nr; i++) {
2822 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2823 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2824 continue;
2825 n++;
2826 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2827 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2828 continue;
2829 /* update endpoints */
2830 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2831 sizeof(pol->xfrm_vec[i].id.daddr));
2832 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2833 sizeof(pol->xfrm_vec[i].saddr));
2834 pol->xfrm_vec[i].encap_family = mp->new_family;
2835 /* flush bundles */
2836 atomic_inc(&pol->genid);
2837 }
2838 }
2839
2840 write_unlock_bh(&pol->lock);
2841
2842 if (!n)
2843 return -ENODATA;
2844
2845 return 0;
2846 }
2847
2848 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2849 {
2850 int i, j;
2851
2852 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2853 return -EINVAL;
2854
2855 for (i = 0; i < num_migrate; i++) {
2856 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2857 m[i].old_family) == 0) &&
2858 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2859 m[i].old_family) == 0))
2860 return -EINVAL;
2861 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2862 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2863 return -EINVAL;
2864
2865 /* check if there is any duplicated entry */
2866 for (j = i + 1; j < num_migrate; j++) {
2867 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2868 sizeof(m[i].old_daddr)) &&
2869 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2870 sizeof(m[i].old_saddr)) &&
2871 m[i].proto == m[j].proto &&
2872 m[i].mode == m[j].mode &&
2873 m[i].reqid == m[j].reqid &&
2874 m[i].old_family == m[j].old_family)
2875 return -EINVAL;
2876 }
2877 }
2878
2879 return 0;
2880 }
2881
2882 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2883 struct xfrm_migrate *m, int num_migrate,
2884 struct xfrm_kmaddress *k)
2885 {
2886 int i, err, nx_cur = 0, nx_new = 0;
2887 struct xfrm_policy *pol = NULL;
2888 struct xfrm_state *x, *xc;
2889 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2890 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2891 struct xfrm_migrate *mp;
2892
2893 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2894 goto out;
2895
2896 /* Stage 1 - find policy */
2897 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2898 err = -ENOENT;
2899 goto out;
2900 }
2901
2902 /* Stage 2 - find and update state(s) */
2903 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2904 if ((x = xfrm_migrate_state_find(mp))) {
2905 x_cur[nx_cur] = x;
2906 nx_cur++;
2907 if ((xc = xfrm_state_migrate(x, mp))) {
2908 x_new[nx_new] = xc;
2909 nx_new++;
2910 } else {
2911 err = -ENODATA;
2912 goto restore_state;
2913 }
2914 }
2915 }
2916
2917 /* Stage 3 - update policy */
2918 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2919 goto restore_state;
2920
2921 /* Stage 4 - delete old state(s) */
2922 if (nx_cur) {
2923 xfrm_states_put(x_cur, nx_cur);
2924 xfrm_states_delete(x_cur, nx_cur);
2925 }
2926
2927 /* Stage 5 - announce */
2928 km_migrate(sel, dir, type, m, num_migrate, k);
2929
2930 xfrm_pol_put(pol);
2931
2932 return 0;
2933 out:
2934 return err;
2935
2936 restore_state:
2937 if (pol)
2938 xfrm_pol_put(pol);
2939 if (nx_cur)
2940 xfrm_states_put(x_cur, nx_cur);
2941 if (nx_new)
2942 xfrm_states_delete(x_new, nx_new);
2943
2944 return err;
2945 }
2946 EXPORT_SYMBOL(xfrm_migrate);
2947 #endif