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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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/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
54 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
55 int dir);
56
57 static inline int
58 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
59 {
60 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
61 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
62 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
63 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
64 (fl->proto == sel->proto || !sel->proto) &&
65 (fl->oif == sel->ifindex || !sel->ifindex);
66 }
67
68 static inline int
69 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
70 {
71 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
72 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
73 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
74 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
75 (fl->proto == sel->proto || !sel->proto) &&
76 (fl->oif == sel->ifindex || !sel->ifindex);
77 }
78
79 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
80 unsigned short family)
81 {
82 switch (family) {
83 case AF_INET:
84 return __xfrm4_selector_match(sel, fl);
85 case AF_INET6:
86 return __xfrm6_selector_match(sel, fl);
87 }
88 return 0;
89 }
90
91 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
92 xfrm_address_t *saddr,
93 xfrm_address_t *daddr,
94 int family)
95 {
96 struct xfrm_policy_afinfo *afinfo;
97 struct dst_entry *dst;
98
99 afinfo = xfrm_policy_get_afinfo(family);
100 if (unlikely(afinfo == NULL))
101 return ERR_PTR(-EAFNOSUPPORT);
102
103 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
104
105 xfrm_policy_put_afinfo(afinfo);
106
107 return dst;
108 }
109
110 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
111 xfrm_address_t *prev_saddr,
112 xfrm_address_t *prev_daddr,
113 int family)
114 {
115 struct net *net = xs_net(x);
116 xfrm_address_t *saddr = &x->props.saddr;
117 xfrm_address_t *daddr = &x->id.daddr;
118 struct dst_entry *dst;
119
120 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
121 saddr = x->coaddr;
122 daddr = prev_daddr;
123 }
124 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
125 saddr = prev_saddr;
126 daddr = x->coaddr;
127 }
128
129 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
130
131 if (!IS_ERR(dst)) {
132 if (prev_saddr != saddr)
133 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
134 if (prev_daddr != daddr)
135 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
136 }
137
138 return dst;
139 }
140
141 static inline unsigned long make_jiffies(long secs)
142 {
143 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
144 return MAX_SCHEDULE_TIMEOUT-1;
145 else
146 return secs*HZ;
147 }
148
149 static void xfrm_policy_timer(unsigned long data)
150 {
151 struct xfrm_policy *xp = (struct xfrm_policy*)data;
152 unsigned long now = get_seconds();
153 long next = LONG_MAX;
154 int warn = 0;
155 int dir;
156
157 read_lock(&xp->lock);
158
159 if (unlikely(xp->walk.dead))
160 goto out;
161
162 dir = xfrm_policy_id2dir(xp->index);
163
164 if (xp->lft.hard_add_expires_seconds) {
165 long tmo = xp->lft.hard_add_expires_seconds +
166 xp->curlft.add_time - now;
167 if (tmo <= 0)
168 goto expired;
169 if (tmo < next)
170 next = tmo;
171 }
172 if (xp->lft.hard_use_expires_seconds) {
173 long tmo = xp->lft.hard_use_expires_seconds +
174 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
175 if (tmo <= 0)
176 goto expired;
177 if (tmo < next)
178 next = tmo;
179 }
180 if (xp->lft.soft_add_expires_seconds) {
181 long tmo = xp->lft.soft_add_expires_seconds +
182 xp->curlft.add_time - now;
183 if (tmo <= 0) {
184 warn = 1;
185 tmo = XFRM_KM_TIMEOUT;
186 }
187 if (tmo < next)
188 next = tmo;
189 }
190 if (xp->lft.soft_use_expires_seconds) {
191 long tmo = xp->lft.soft_use_expires_seconds +
192 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
193 if (tmo <= 0) {
194 warn = 1;
195 tmo = XFRM_KM_TIMEOUT;
196 }
197 if (tmo < next)
198 next = tmo;
199 }
200
201 if (warn)
202 km_policy_expired(xp, dir, 0, 0);
203 if (next != LONG_MAX &&
204 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
205 xfrm_pol_hold(xp);
206
207 out:
208 read_unlock(&xp->lock);
209 xfrm_pol_put(xp);
210 return;
211
212 expired:
213 read_unlock(&xp->lock);
214 if (!xfrm_policy_delete(xp, dir))
215 km_policy_expired(xp, dir, 1, 0);
216 xfrm_pol_put(xp);
217 }
218
219 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
220 {
221 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
222
223 if (unlikely(pol->walk.dead))
224 flo = NULL;
225 else
226 xfrm_pol_hold(pol);
227
228 return flo;
229 }
230
231 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
232 {
233 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
234
235 return !pol->walk.dead;
236 }
237
238 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
239 {
240 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
241 }
242
243 static const struct flow_cache_ops xfrm_policy_fc_ops = {
244 .get = xfrm_policy_flo_get,
245 .check = xfrm_policy_flo_check,
246 .delete = xfrm_policy_flo_delete,
247 };
248
249 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
250 * SPD calls.
251 */
252
253 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
254 {
255 struct xfrm_policy *policy;
256
257 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
258
259 if (policy) {
260 write_pnet(&policy->xp_net, net);
261 INIT_LIST_HEAD(&policy->walk.all);
262 INIT_HLIST_NODE(&policy->bydst);
263 INIT_HLIST_NODE(&policy->byidx);
264 rwlock_init(&policy->lock);
265 atomic_set(&policy->refcnt, 1);
266 setup_timer(&policy->timer, xfrm_policy_timer,
267 (unsigned long)policy);
268 policy->flo.ops = &xfrm_policy_fc_ops;
269 }
270 return policy;
271 }
272 EXPORT_SYMBOL(xfrm_policy_alloc);
273
274 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
275
276 void xfrm_policy_destroy(struct xfrm_policy *policy)
277 {
278 BUG_ON(!policy->walk.dead);
279
280 if (del_timer(&policy->timer))
281 BUG();
282
283 security_xfrm_policy_free(policy->security);
284 kfree(policy);
285 }
286 EXPORT_SYMBOL(xfrm_policy_destroy);
287
288 /* Rule must be locked. Release descentant resources, announce
289 * entry dead. The rule must be unlinked from lists to the moment.
290 */
291
292 static void xfrm_policy_kill(struct xfrm_policy *policy)
293 {
294 policy->walk.dead = 1;
295
296 atomic_inc(&policy->genid);
297
298 if (del_timer(&policy->timer))
299 xfrm_pol_put(policy);
300
301 xfrm_pol_put(policy);
302 }
303
304 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
305
306 static inline unsigned int idx_hash(struct net *net, u32 index)
307 {
308 return __idx_hash(index, net->xfrm.policy_idx_hmask);
309 }
310
311 static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
312 {
313 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
314 unsigned int hash = __sel_hash(sel, family, hmask);
315
316 return (hash == hmask + 1 ?
317 &net->xfrm.policy_inexact[dir] :
318 net->xfrm.policy_bydst[dir].table + hash);
319 }
320
321 static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
322 {
323 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
324 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
325
326 return net->xfrm.policy_bydst[dir].table + hash;
327 }
328
329 static void xfrm_dst_hash_transfer(struct hlist_head *list,
330 struct hlist_head *ndsttable,
331 unsigned int nhashmask)
332 {
333 struct hlist_node *entry, *tmp, *entry0 = NULL;
334 struct xfrm_policy *pol;
335 unsigned int h0 = 0;
336
337 redo:
338 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
339 unsigned int h;
340
341 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
342 pol->family, nhashmask);
343 if (!entry0) {
344 hlist_del(entry);
345 hlist_add_head(&pol->bydst, ndsttable+h);
346 h0 = h;
347 } else {
348 if (h != h0)
349 continue;
350 hlist_del(entry);
351 hlist_add_after(entry0, &pol->bydst);
352 }
353 entry0 = entry;
354 }
355 if (!hlist_empty(list)) {
356 entry0 = NULL;
357 goto redo;
358 }
359 }
360
361 static void xfrm_idx_hash_transfer(struct hlist_head *list,
362 struct hlist_head *nidxtable,
363 unsigned int nhashmask)
364 {
365 struct hlist_node *entry, *tmp;
366 struct xfrm_policy *pol;
367
368 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
369 unsigned int h;
370
371 h = __idx_hash(pol->index, nhashmask);
372 hlist_add_head(&pol->byidx, nidxtable+h);
373 }
374 }
375
376 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
377 {
378 return ((old_hmask + 1) << 1) - 1;
379 }
380
381 static void xfrm_bydst_resize(struct net *net, int dir)
382 {
383 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
384 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
385 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
386 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
387 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
388 int i;
389
390 if (!ndst)
391 return;
392
393 write_lock_bh(&xfrm_policy_lock);
394
395 for (i = hmask; i >= 0; i--)
396 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
397
398 net->xfrm.policy_bydst[dir].table = ndst;
399 net->xfrm.policy_bydst[dir].hmask = nhashmask;
400
401 write_unlock_bh(&xfrm_policy_lock);
402
403 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
404 }
405
406 static void xfrm_byidx_resize(struct net *net, int total)
407 {
408 unsigned int hmask = net->xfrm.policy_idx_hmask;
409 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
410 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
411 struct hlist_head *oidx = net->xfrm.policy_byidx;
412 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
413 int i;
414
415 if (!nidx)
416 return;
417
418 write_lock_bh(&xfrm_policy_lock);
419
420 for (i = hmask; i >= 0; i--)
421 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
422
423 net->xfrm.policy_byidx = nidx;
424 net->xfrm.policy_idx_hmask = nhashmask;
425
426 write_unlock_bh(&xfrm_policy_lock);
427
428 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
429 }
430
431 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
432 {
433 unsigned int cnt = net->xfrm.policy_count[dir];
434 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
435
436 if (total)
437 *total += cnt;
438
439 if ((hmask + 1) < xfrm_policy_hashmax &&
440 cnt > hmask)
441 return 1;
442
443 return 0;
444 }
445
446 static inline int xfrm_byidx_should_resize(struct net *net, int total)
447 {
448 unsigned int hmask = net->xfrm.policy_idx_hmask;
449
450 if ((hmask + 1) < xfrm_policy_hashmax &&
451 total > hmask)
452 return 1;
453
454 return 0;
455 }
456
457 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
458 {
459 read_lock_bh(&xfrm_policy_lock);
460 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
461 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
462 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
463 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
464 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
465 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
466 si->spdhcnt = net->xfrm.policy_idx_hmask;
467 si->spdhmcnt = xfrm_policy_hashmax;
468 read_unlock_bh(&xfrm_policy_lock);
469 }
470 EXPORT_SYMBOL(xfrm_spd_getinfo);
471
472 static DEFINE_MUTEX(hash_resize_mutex);
473 static void xfrm_hash_resize(struct work_struct *work)
474 {
475 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
476 int dir, total;
477
478 mutex_lock(&hash_resize_mutex);
479
480 total = 0;
481 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
482 if (xfrm_bydst_should_resize(net, dir, &total))
483 xfrm_bydst_resize(net, dir);
484 }
485 if (xfrm_byidx_should_resize(net, total))
486 xfrm_byidx_resize(net, total);
487
488 mutex_unlock(&hash_resize_mutex);
489 }
490
491 /* Generate new index... KAME seems to generate them ordered by cost
492 * of an absolute inpredictability of ordering of rules. This will not pass. */
493 static u32 xfrm_gen_index(struct net *net, int dir)
494 {
495 static u32 idx_generator;
496
497 for (;;) {
498 struct hlist_node *entry;
499 struct hlist_head *list;
500 struct xfrm_policy *p;
501 u32 idx;
502 int found;
503
504 idx = (idx_generator | dir);
505 idx_generator += 8;
506 if (idx == 0)
507 idx = 8;
508 list = net->xfrm.policy_byidx + idx_hash(net, idx);
509 found = 0;
510 hlist_for_each_entry(p, entry, list, byidx) {
511 if (p->index == idx) {
512 found = 1;
513 break;
514 }
515 }
516 if (!found)
517 return idx;
518 }
519 }
520
521 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
522 {
523 u32 *p1 = (u32 *) s1;
524 u32 *p2 = (u32 *) s2;
525 int len = sizeof(struct xfrm_selector) / sizeof(u32);
526 int i;
527
528 for (i = 0; i < len; i++) {
529 if (p1[i] != p2[i])
530 return 1;
531 }
532
533 return 0;
534 }
535
536 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
537 {
538 struct net *net = xp_net(policy);
539 struct xfrm_policy *pol;
540 struct xfrm_policy *delpol;
541 struct hlist_head *chain;
542 struct hlist_node *entry, *newpos;
543 u32 mark = policy->mark.v & policy->mark.m;
544
545 write_lock_bh(&xfrm_policy_lock);
546 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
547 delpol = NULL;
548 newpos = NULL;
549 hlist_for_each_entry(pol, entry, chain, bydst) {
550 if (pol->type == policy->type &&
551 !selector_cmp(&pol->selector, &policy->selector) &&
552 (mark & pol->mark.m) == pol->mark.v &&
553 xfrm_sec_ctx_match(pol->security, policy->security) &&
554 !WARN_ON(delpol)) {
555 if (excl) {
556 write_unlock_bh(&xfrm_policy_lock);
557 return -EEXIST;
558 }
559 delpol = pol;
560 if (policy->priority > pol->priority)
561 continue;
562 } else if (policy->priority >= pol->priority) {
563 newpos = &pol->bydst;
564 continue;
565 }
566 if (delpol)
567 break;
568 }
569 if (newpos)
570 hlist_add_after(newpos, &policy->bydst);
571 else
572 hlist_add_head(&policy->bydst, chain);
573 xfrm_pol_hold(policy);
574 net->xfrm.policy_count[dir]++;
575 atomic_inc(&flow_cache_genid);
576 if (delpol)
577 __xfrm_policy_unlink(delpol, dir);
578 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
579 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
580 policy->curlft.add_time = get_seconds();
581 policy->curlft.use_time = 0;
582 if (!mod_timer(&policy->timer, jiffies + HZ))
583 xfrm_pol_hold(policy);
584 list_add(&policy->walk.all, &net->xfrm.policy_all);
585 write_unlock_bh(&xfrm_policy_lock);
586
587 if (delpol)
588 xfrm_policy_kill(delpol);
589 else if (xfrm_bydst_should_resize(net, dir, NULL))
590 schedule_work(&net->xfrm.policy_hash_work);
591
592 return 0;
593 }
594 EXPORT_SYMBOL(xfrm_policy_insert);
595
596 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
597 int dir, struct xfrm_selector *sel,
598 struct xfrm_sec_ctx *ctx, int delete,
599 int *err)
600 {
601 struct xfrm_policy *pol, *ret;
602 struct hlist_head *chain;
603 struct hlist_node *entry;
604
605 *err = 0;
606 write_lock_bh(&xfrm_policy_lock);
607 chain = policy_hash_bysel(net, sel, sel->family, dir);
608 ret = NULL;
609 hlist_for_each_entry(pol, entry, chain, bydst) {
610 if (pol->type == type &&
611 (mark & pol->mark.m) == pol->mark.v &&
612 !selector_cmp(sel, &pol->selector) &&
613 xfrm_sec_ctx_match(ctx, pol->security)) {
614 xfrm_pol_hold(pol);
615 if (delete) {
616 *err = security_xfrm_policy_delete(
617 pol->security);
618 if (*err) {
619 write_unlock_bh(&xfrm_policy_lock);
620 return pol;
621 }
622 __xfrm_policy_unlink(pol, dir);
623 }
624 ret = pol;
625 break;
626 }
627 }
628 write_unlock_bh(&xfrm_policy_lock);
629
630 if (ret && delete)
631 xfrm_policy_kill(ret);
632 return ret;
633 }
634 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
635
636 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
637 int dir, u32 id, int delete, int *err)
638 {
639 struct xfrm_policy *pol, *ret;
640 struct hlist_head *chain;
641 struct hlist_node *entry;
642
643 *err = -ENOENT;
644 if (xfrm_policy_id2dir(id) != dir)
645 return NULL;
646
647 *err = 0;
648 write_lock_bh(&xfrm_policy_lock);
649 chain = net->xfrm.policy_byidx + idx_hash(net, id);
650 ret = NULL;
651 hlist_for_each_entry(pol, entry, chain, byidx) {
652 if (pol->type == type && pol->index == id &&
653 (mark & pol->mark.m) == pol->mark.v) {
654 xfrm_pol_hold(pol);
655 if (delete) {
656 *err = security_xfrm_policy_delete(
657 pol->security);
658 if (*err) {
659 write_unlock_bh(&xfrm_policy_lock);
660 return pol;
661 }
662 __xfrm_policy_unlink(pol, dir);
663 }
664 ret = pol;
665 break;
666 }
667 }
668 write_unlock_bh(&xfrm_policy_lock);
669
670 if (ret && delete)
671 xfrm_policy_kill(ret);
672 return ret;
673 }
674 EXPORT_SYMBOL(xfrm_policy_byid);
675
676 #ifdef CONFIG_SECURITY_NETWORK_XFRM
677 static inline int
678 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
679 {
680 int dir, err = 0;
681
682 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
683 struct xfrm_policy *pol;
684 struct hlist_node *entry;
685 int i;
686
687 hlist_for_each_entry(pol, entry,
688 &net->xfrm.policy_inexact[dir], bydst) {
689 if (pol->type != type)
690 continue;
691 err = security_xfrm_policy_delete(pol->security);
692 if (err) {
693 xfrm_audit_policy_delete(pol, 0,
694 audit_info->loginuid,
695 audit_info->sessionid,
696 audit_info->secid);
697 return err;
698 }
699 }
700 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
701 hlist_for_each_entry(pol, entry,
702 net->xfrm.policy_bydst[dir].table + i,
703 bydst) {
704 if (pol->type != type)
705 continue;
706 err = security_xfrm_policy_delete(
707 pol->security);
708 if (err) {
709 xfrm_audit_policy_delete(pol, 0,
710 audit_info->loginuid,
711 audit_info->sessionid,
712 audit_info->secid);
713 return err;
714 }
715 }
716 }
717 }
718 return err;
719 }
720 #else
721 static inline int
722 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
723 {
724 return 0;
725 }
726 #endif
727
728 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
729 {
730 int dir, err = 0, cnt = 0;
731
732 write_lock_bh(&xfrm_policy_lock);
733
734 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
735 if (err)
736 goto out;
737
738 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
739 struct xfrm_policy *pol;
740 struct hlist_node *entry;
741 int i;
742
743 again1:
744 hlist_for_each_entry(pol, entry,
745 &net->xfrm.policy_inexact[dir], bydst) {
746 if (pol->type != type)
747 continue;
748 __xfrm_policy_unlink(pol, dir);
749 write_unlock_bh(&xfrm_policy_lock);
750 cnt++;
751
752 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
753 audit_info->sessionid,
754 audit_info->secid);
755
756 xfrm_policy_kill(pol);
757
758 write_lock_bh(&xfrm_policy_lock);
759 goto again1;
760 }
761
762 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
763 again2:
764 hlist_for_each_entry(pol, entry,
765 net->xfrm.policy_bydst[dir].table + i,
766 bydst) {
767 if (pol->type != type)
768 continue;
769 __xfrm_policy_unlink(pol, dir);
770 write_unlock_bh(&xfrm_policy_lock);
771 cnt++;
772
773 xfrm_audit_policy_delete(pol, 1,
774 audit_info->loginuid,
775 audit_info->sessionid,
776 audit_info->secid);
777 xfrm_policy_kill(pol);
778
779 write_lock_bh(&xfrm_policy_lock);
780 goto again2;
781 }
782 }
783
784 }
785 if (!cnt)
786 err = -ESRCH;
787 out:
788 write_unlock_bh(&xfrm_policy_lock);
789 return err;
790 }
791 EXPORT_SYMBOL(xfrm_policy_flush);
792
793 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
794 int (*func)(struct xfrm_policy *, int, int, void*),
795 void *data)
796 {
797 struct xfrm_policy *pol;
798 struct xfrm_policy_walk_entry *x;
799 int error = 0;
800
801 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
802 walk->type != XFRM_POLICY_TYPE_ANY)
803 return -EINVAL;
804
805 if (list_empty(&walk->walk.all) && walk->seq != 0)
806 return 0;
807
808 write_lock_bh(&xfrm_policy_lock);
809 if (list_empty(&walk->walk.all))
810 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
811 else
812 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
813 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
814 if (x->dead)
815 continue;
816 pol = container_of(x, struct xfrm_policy, walk);
817 if (walk->type != XFRM_POLICY_TYPE_ANY &&
818 walk->type != pol->type)
819 continue;
820 error = func(pol, xfrm_policy_id2dir(pol->index),
821 walk->seq, data);
822 if (error) {
823 list_move_tail(&walk->walk.all, &x->all);
824 goto out;
825 }
826 walk->seq++;
827 }
828 if (walk->seq == 0) {
829 error = -ENOENT;
830 goto out;
831 }
832 list_del_init(&walk->walk.all);
833 out:
834 write_unlock_bh(&xfrm_policy_lock);
835 return error;
836 }
837 EXPORT_SYMBOL(xfrm_policy_walk);
838
839 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
840 {
841 INIT_LIST_HEAD(&walk->walk.all);
842 walk->walk.dead = 1;
843 walk->type = type;
844 walk->seq = 0;
845 }
846 EXPORT_SYMBOL(xfrm_policy_walk_init);
847
848 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
849 {
850 if (list_empty(&walk->walk.all))
851 return;
852
853 write_lock_bh(&xfrm_policy_lock);
854 list_del(&walk->walk.all);
855 write_unlock_bh(&xfrm_policy_lock);
856 }
857 EXPORT_SYMBOL(xfrm_policy_walk_done);
858
859 /*
860 * Find policy to apply to this flow.
861 *
862 * Returns 0 if policy found, else an -errno.
863 */
864 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
865 u8 type, u16 family, int dir)
866 {
867 struct xfrm_selector *sel = &pol->selector;
868 int match, ret = -ESRCH;
869
870 if (pol->family != family ||
871 (fl->mark & pol->mark.m) != pol->mark.v ||
872 pol->type != type)
873 return ret;
874
875 match = xfrm_selector_match(sel, fl, family);
876 if (match)
877 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
878 dir);
879
880 return ret;
881 }
882
883 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
884 struct flowi *fl,
885 u16 family, u8 dir)
886 {
887 int err;
888 struct xfrm_policy *pol, *ret;
889 xfrm_address_t *daddr, *saddr;
890 struct hlist_node *entry;
891 struct hlist_head *chain;
892 u32 priority = ~0U;
893
894 daddr = xfrm_flowi_daddr(fl, family);
895 saddr = xfrm_flowi_saddr(fl, family);
896 if (unlikely(!daddr || !saddr))
897 return NULL;
898
899 read_lock_bh(&xfrm_policy_lock);
900 chain = policy_hash_direct(net, daddr, saddr, family, dir);
901 ret = NULL;
902 hlist_for_each_entry(pol, entry, chain, bydst) {
903 err = xfrm_policy_match(pol, fl, type, family, dir);
904 if (err) {
905 if (err == -ESRCH)
906 continue;
907 else {
908 ret = ERR_PTR(err);
909 goto fail;
910 }
911 } else {
912 ret = pol;
913 priority = ret->priority;
914 break;
915 }
916 }
917 chain = &net->xfrm.policy_inexact[dir];
918 hlist_for_each_entry(pol, entry, chain, bydst) {
919 err = xfrm_policy_match(pol, fl, type, family, dir);
920 if (err) {
921 if (err == -ESRCH)
922 continue;
923 else {
924 ret = ERR_PTR(err);
925 goto fail;
926 }
927 } else if (pol->priority < priority) {
928 ret = pol;
929 break;
930 }
931 }
932 if (ret)
933 xfrm_pol_hold(ret);
934 fail:
935 read_unlock_bh(&xfrm_policy_lock);
936
937 return ret;
938 }
939
940 static struct xfrm_policy *
941 __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
942 {
943 #ifdef CONFIG_XFRM_SUB_POLICY
944 struct xfrm_policy *pol;
945
946 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
947 if (pol != NULL)
948 return pol;
949 #endif
950 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
951 }
952
953 static struct flow_cache_object *
954 xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
955 u8 dir, struct flow_cache_object *old_obj, void *ctx)
956 {
957 struct xfrm_policy *pol;
958
959 if (old_obj)
960 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
961
962 pol = __xfrm_policy_lookup(net, fl, family, dir);
963 if (IS_ERR_OR_NULL(pol))
964 return ERR_CAST(pol);
965
966 /* Resolver returns two references:
967 * one for cache and one for caller of flow_cache_lookup() */
968 xfrm_pol_hold(pol);
969
970 return &pol->flo;
971 }
972
973 static inline int policy_to_flow_dir(int dir)
974 {
975 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
976 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
977 XFRM_POLICY_FWD == FLOW_DIR_FWD)
978 return dir;
979 switch (dir) {
980 default:
981 case XFRM_POLICY_IN:
982 return FLOW_DIR_IN;
983 case XFRM_POLICY_OUT:
984 return FLOW_DIR_OUT;
985 case XFRM_POLICY_FWD:
986 return FLOW_DIR_FWD;
987 }
988 }
989
990 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
991 {
992 struct xfrm_policy *pol;
993
994 read_lock_bh(&xfrm_policy_lock);
995 if ((pol = sk->sk_policy[dir]) != NULL) {
996 int match = xfrm_selector_match(&pol->selector, fl,
997 sk->sk_family);
998 int err = 0;
999
1000 if (match) {
1001 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1002 pol = NULL;
1003 goto out;
1004 }
1005 err = security_xfrm_policy_lookup(pol->security,
1006 fl->secid,
1007 policy_to_flow_dir(dir));
1008 if (!err)
1009 xfrm_pol_hold(pol);
1010 else if (err == -ESRCH)
1011 pol = NULL;
1012 else
1013 pol = ERR_PTR(err);
1014 } else
1015 pol = NULL;
1016 }
1017 out:
1018 read_unlock_bh(&xfrm_policy_lock);
1019 return pol;
1020 }
1021
1022 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1023 {
1024 struct net *net = xp_net(pol);
1025 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1026 pol->family, dir);
1027
1028 list_add(&pol->walk.all, &net->xfrm.policy_all);
1029 hlist_add_head(&pol->bydst, chain);
1030 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1031 net->xfrm.policy_count[dir]++;
1032 xfrm_pol_hold(pol);
1033
1034 if (xfrm_bydst_should_resize(net, dir, NULL))
1035 schedule_work(&net->xfrm.policy_hash_work);
1036 }
1037
1038 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1039 int dir)
1040 {
1041 struct net *net = xp_net(pol);
1042
1043 if (hlist_unhashed(&pol->bydst))
1044 return NULL;
1045
1046 hlist_del(&pol->bydst);
1047 hlist_del(&pol->byidx);
1048 list_del(&pol->walk.all);
1049 net->xfrm.policy_count[dir]--;
1050
1051 return pol;
1052 }
1053
1054 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1055 {
1056 write_lock_bh(&xfrm_policy_lock);
1057 pol = __xfrm_policy_unlink(pol, dir);
1058 write_unlock_bh(&xfrm_policy_lock);
1059 if (pol) {
1060 xfrm_policy_kill(pol);
1061 return 0;
1062 }
1063 return -ENOENT;
1064 }
1065 EXPORT_SYMBOL(xfrm_policy_delete);
1066
1067 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1068 {
1069 struct net *net = xp_net(pol);
1070 struct xfrm_policy *old_pol;
1071
1072 #ifdef CONFIG_XFRM_SUB_POLICY
1073 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1074 return -EINVAL;
1075 #endif
1076
1077 write_lock_bh(&xfrm_policy_lock);
1078 old_pol = sk->sk_policy[dir];
1079 sk->sk_policy[dir] = pol;
1080 if (pol) {
1081 pol->curlft.add_time = get_seconds();
1082 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1083 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1084 }
1085 if (old_pol)
1086 /* Unlinking succeeds always. This is the only function
1087 * allowed to delete or replace socket policy.
1088 */
1089 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1090 write_unlock_bh(&xfrm_policy_lock);
1091
1092 if (old_pol) {
1093 xfrm_policy_kill(old_pol);
1094 }
1095 return 0;
1096 }
1097
1098 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1099 {
1100 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1101
1102 if (newp) {
1103 newp->selector = old->selector;
1104 if (security_xfrm_policy_clone(old->security,
1105 &newp->security)) {
1106 kfree(newp);
1107 return NULL; /* ENOMEM */
1108 }
1109 newp->lft = old->lft;
1110 newp->curlft = old->curlft;
1111 newp->mark = old->mark;
1112 newp->action = old->action;
1113 newp->flags = old->flags;
1114 newp->xfrm_nr = old->xfrm_nr;
1115 newp->index = old->index;
1116 newp->type = old->type;
1117 memcpy(newp->xfrm_vec, old->xfrm_vec,
1118 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1119 write_lock_bh(&xfrm_policy_lock);
1120 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1121 write_unlock_bh(&xfrm_policy_lock);
1122 xfrm_pol_put(newp);
1123 }
1124 return newp;
1125 }
1126
1127 int __xfrm_sk_clone_policy(struct sock *sk)
1128 {
1129 struct xfrm_policy *p0 = sk->sk_policy[0],
1130 *p1 = sk->sk_policy[1];
1131
1132 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1133 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1134 return -ENOMEM;
1135 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1136 return -ENOMEM;
1137 return 0;
1138 }
1139
1140 static int
1141 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1142 unsigned short family)
1143 {
1144 int err;
1145 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1146
1147 if (unlikely(afinfo == NULL))
1148 return -EINVAL;
1149 err = afinfo->get_saddr(net, local, remote);
1150 xfrm_policy_put_afinfo(afinfo);
1151 return err;
1152 }
1153
1154 /* Resolve list of templates for the flow, given policy. */
1155
1156 static int
1157 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1158 struct xfrm_state **xfrm,
1159 unsigned short family)
1160 {
1161 struct net *net = xp_net(policy);
1162 int nx;
1163 int i, error;
1164 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1165 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1166 xfrm_address_t tmp;
1167
1168 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1169 struct xfrm_state *x;
1170 xfrm_address_t *remote = daddr;
1171 xfrm_address_t *local = saddr;
1172 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1173
1174 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1175 tmpl->mode == XFRM_MODE_BEET) {
1176 remote = &tmpl->id.daddr;
1177 local = &tmpl->saddr;
1178 family = tmpl->encap_family;
1179 if (xfrm_addr_any(local, family)) {
1180 error = xfrm_get_saddr(net, &tmp, remote, family);
1181 if (error)
1182 goto fail;
1183 local = &tmp;
1184 }
1185 }
1186
1187 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1188
1189 if (x && x->km.state == XFRM_STATE_VALID) {
1190 xfrm[nx++] = x;
1191 daddr = remote;
1192 saddr = local;
1193 continue;
1194 }
1195 if (x) {
1196 error = (x->km.state == XFRM_STATE_ERROR ?
1197 -EINVAL : -EAGAIN);
1198 xfrm_state_put(x);
1199 }
1200 else if (error == -ESRCH)
1201 error = -EAGAIN;
1202
1203 if (!tmpl->optional)
1204 goto fail;
1205 }
1206 return nx;
1207
1208 fail:
1209 for (nx--; nx>=0; nx--)
1210 xfrm_state_put(xfrm[nx]);
1211 return error;
1212 }
1213
1214 static int
1215 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1216 struct xfrm_state **xfrm,
1217 unsigned short family)
1218 {
1219 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1220 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1221 int cnx = 0;
1222 int error;
1223 int ret;
1224 int i;
1225
1226 for (i = 0; i < npols; i++) {
1227 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1228 error = -ENOBUFS;
1229 goto fail;
1230 }
1231
1232 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1233 if (ret < 0) {
1234 error = ret;
1235 goto fail;
1236 } else
1237 cnx += ret;
1238 }
1239
1240 /* found states are sorted for outbound processing */
1241 if (npols > 1)
1242 xfrm_state_sort(xfrm, tpp, cnx, family);
1243
1244 return cnx;
1245
1246 fail:
1247 for (cnx--; cnx>=0; cnx--)
1248 xfrm_state_put(tpp[cnx]);
1249 return error;
1250
1251 }
1252
1253 /* Check that the bundle accepts the flow and its components are
1254 * still valid.
1255 */
1256
1257 static inline int xfrm_get_tos(struct flowi *fl, int family)
1258 {
1259 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1260 int tos;
1261
1262 if (!afinfo)
1263 return -EINVAL;
1264
1265 tos = afinfo->get_tos(fl);
1266
1267 xfrm_policy_put_afinfo(afinfo);
1268
1269 return tos;
1270 }
1271
1272 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1273 {
1274 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1275 struct dst_entry *dst = &xdst->u.dst;
1276
1277 if (xdst->route == NULL) {
1278 /* Dummy bundle - if it has xfrms we were not
1279 * able to build bundle as template resolution failed.
1280 * It means we need to try again resolving. */
1281 if (xdst->num_xfrms > 0)
1282 return NULL;
1283 } else {
1284 /* Real bundle */
1285 if (stale_bundle(dst))
1286 return NULL;
1287 }
1288
1289 dst_hold(dst);
1290 return flo;
1291 }
1292
1293 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1294 {
1295 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1296 struct dst_entry *dst = &xdst->u.dst;
1297
1298 if (!xdst->route)
1299 return 0;
1300 if (stale_bundle(dst))
1301 return 0;
1302
1303 return 1;
1304 }
1305
1306 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1307 {
1308 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1309 struct dst_entry *dst = &xdst->u.dst;
1310
1311 dst_free(dst);
1312 }
1313
1314 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1315 .get = xfrm_bundle_flo_get,
1316 .check = xfrm_bundle_flo_check,
1317 .delete = xfrm_bundle_flo_delete,
1318 };
1319
1320 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1321 {
1322 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1323 struct dst_ops *dst_ops;
1324 struct xfrm_dst *xdst;
1325
1326 if (!afinfo)
1327 return ERR_PTR(-EINVAL);
1328
1329 switch (family) {
1330 case AF_INET:
1331 dst_ops = &net->xfrm.xfrm4_dst_ops;
1332 break;
1333 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1334 case AF_INET6:
1335 dst_ops = &net->xfrm.xfrm6_dst_ops;
1336 break;
1337 #endif
1338 default:
1339 BUG();
1340 }
1341 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
1342 xfrm_policy_put_afinfo(afinfo);
1343
1344 xdst->flo.ops = &xfrm_bundle_fc_ops;
1345
1346 return xdst;
1347 }
1348
1349 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1350 int nfheader_len)
1351 {
1352 struct xfrm_policy_afinfo *afinfo =
1353 xfrm_policy_get_afinfo(dst->ops->family);
1354 int err;
1355
1356 if (!afinfo)
1357 return -EINVAL;
1358
1359 err = afinfo->init_path(path, dst, nfheader_len);
1360
1361 xfrm_policy_put_afinfo(afinfo);
1362
1363 return err;
1364 }
1365
1366 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1367 struct flowi *fl)
1368 {
1369 struct xfrm_policy_afinfo *afinfo =
1370 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1371 int err;
1372
1373 if (!afinfo)
1374 return -EINVAL;
1375
1376 err = afinfo->fill_dst(xdst, dev, fl);
1377
1378 xfrm_policy_put_afinfo(afinfo);
1379
1380 return err;
1381 }
1382
1383
1384 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1385 * all the metrics... Shortly, bundle a bundle.
1386 */
1387
1388 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1389 struct xfrm_state **xfrm, int nx,
1390 struct flowi *fl,
1391 struct dst_entry *dst)
1392 {
1393 struct net *net = xp_net(policy);
1394 unsigned long now = jiffies;
1395 struct net_device *dev;
1396 struct dst_entry *dst_prev = NULL;
1397 struct dst_entry *dst0 = NULL;
1398 int i = 0;
1399 int err;
1400 int header_len = 0;
1401 int nfheader_len = 0;
1402 int trailer_len = 0;
1403 int tos;
1404 int family = policy->selector.family;
1405 xfrm_address_t saddr, daddr;
1406
1407 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1408
1409 tos = xfrm_get_tos(fl, family);
1410 err = tos;
1411 if (tos < 0)
1412 goto put_states;
1413
1414 dst_hold(dst);
1415
1416 for (; i < nx; i++) {
1417 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1418 struct dst_entry *dst1 = &xdst->u.dst;
1419
1420 err = PTR_ERR(xdst);
1421 if (IS_ERR(xdst)) {
1422 dst_release(dst);
1423 goto put_states;
1424 }
1425
1426 if (!dst_prev)
1427 dst0 = dst1;
1428 else {
1429 dst_prev->child = dst_clone(dst1);
1430 dst1->flags |= DST_NOHASH;
1431 }
1432
1433 xdst->route = dst;
1434 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1435
1436 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1437 family = xfrm[i]->props.family;
1438 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1439 family);
1440 err = PTR_ERR(dst);
1441 if (IS_ERR(dst))
1442 goto put_states;
1443 } else
1444 dst_hold(dst);
1445
1446 dst1->xfrm = xfrm[i];
1447 xdst->xfrm_genid = xfrm[i]->genid;
1448
1449 dst1->obsolete = -1;
1450 dst1->flags |= DST_HOST;
1451 dst1->lastuse = now;
1452
1453 dst1->input = dst_discard;
1454 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1455
1456 dst1->next = dst_prev;
1457 dst_prev = dst1;
1458
1459 header_len += xfrm[i]->props.header_len;
1460 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1461 nfheader_len += xfrm[i]->props.header_len;
1462 trailer_len += xfrm[i]->props.trailer_len;
1463 }
1464
1465 dst_prev->child = dst;
1466 dst0->path = dst;
1467
1468 err = -ENODEV;
1469 dev = dst->dev;
1470 if (!dev)
1471 goto free_dst;
1472
1473 /* Copy neighbour for reachability confirmation */
1474 dst0->neighbour = neigh_clone(dst->neighbour);
1475
1476 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1477 xfrm_init_pmtu(dst_prev);
1478
1479 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1480 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1481
1482 err = xfrm_fill_dst(xdst, dev, fl);
1483 if (err)
1484 goto free_dst;
1485
1486 dst_prev->header_len = header_len;
1487 dst_prev->trailer_len = trailer_len;
1488 header_len -= xdst->u.dst.xfrm->props.header_len;
1489 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1490 }
1491
1492 out:
1493 return dst0;
1494
1495 put_states:
1496 for (; i < nx; i++)
1497 xfrm_state_put(xfrm[i]);
1498 free_dst:
1499 if (dst0)
1500 dst_free(dst0);
1501 dst0 = ERR_PTR(err);
1502 goto out;
1503 }
1504
1505 static int inline
1506 xfrm_dst_alloc_copy(void **target, void *src, int size)
1507 {
1508 if (!*target) {
1509 *target = kmalloc(size, GFP_ATOMIC);
1510 if (!*target)
1511 return -ENOMEM;
1512 }
1513 memcpy(*target, src, size);
1514 return 0;
1515 }
1516
1517 static int inline
1518 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1519 {
1520 #ifdef CONFIG_XFRM_SUB_POLICY
1521 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1522 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1523 sel, sizeof(*sel));
1524 #else
1525 return 0;
1526 #endif
1527 }
1528
1529 static int inline
1530 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1531 {
1532 #ifdef CONFIG_XFRM_SUB_POLICY
1533 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1534 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1535 #else
1536 return 0;
1537 #endif
1538 }
1539
1540 static int xfrm_expand_policies(struct flowi *fl, u16 family,
1541 struct xfrm_policy **pols,
1542 int *num_pols, int *num_xfrms)
1543 {
1544 int i;
1545
1546 if (*num_pols == 0 || !pols[0]) {
1547 *num_pols = 0;
1548 *num_xfrms = 0;
1549 return 0;
1550 }
1551 if (IS_ERR(pols[0]))
1552 return PTR_ERR(pols[0]);
1553
1554 *num_xfrms = pols[0]->xfrm_nr;
1555
1556 #ifdef CONFIG_XFRM_SUB_POLICY
1557 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1558 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1559 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1560 XFRM_POLICY_TYPE_MAIN,
1561 fl, family,
1562 XFRM_POLICY_OUT);
1563 if (pols[1]) {
1564 if (IS_ERR(pols[1])) {
1565 xfrm_pols_put(pols, *num_pols);
1566 return PTR_ERR(pols[1]);
1567 }
1568 (*num_pols) ++;
1569 (*num_xfrms) += pols[1]->xfrm_nr;
1570 }
1571 }
1572 #endif
1573 for (i = 0; i < *num_pols; i++) {
1574 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1575 *num_xfrms = -1;
1576 break;
1577 }
1578 }
1579
1580 return 0;
1581
1582 }
1583
1584 static struct xfrm_dst *
1585 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1586 struct flowi *fl, u16 family,
1587 struct dst_entry *dst_orig)
1588 {
1589 struct net *net = xp_net(pols[0]);
1590 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1591 struct dst_entry *dst;
1592 struct xfrm_dst *xdst;
1593 int err;
1594
1595 /* Try to instantiate a bundle */
1596 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1597 if (err <= 0) {
1598 if (err != 0 && err != -EAGAIN)
1599 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1600 return ERR_PTR(err);
1601 }
1602
1603 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1604 if (IS_ERR(dst)) {
1605 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1606 return ERR_CAST(dst);
1607 }
1608
1609 xdst = (struct xfrm_dst *)dst;
1610 xdst->num_xfrms = err;
1611 if (num_pols > 1)
1612 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1613 else
1614 err = xfrm_dst_update_origin(dst, fl);
1615 if (unlikely(err)) {
1616 dst_free(dst);
1617 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1618 return ERR_PTR(err);
1619 }
1620
1621 xdst->num_pols = num_pols;
1622 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1623 xdst->policy_genid = atomic_read(&pols[0]->genid);
1624
1625 return xdst;
1626 }
1627
1628 static struct flow_cache_object *
1629 xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1630 struct flow_cache_object *oldflo, void *ctx)
1631 {
1632 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1633 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1634 struct xfrm_dst *xdst, *new_xdst;
1635 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1636
1637 /* Check if the policies from old bundle are usable */
1638 xdst = NULL;
1639 if (oldflo) {
1640 xdst = container_of(oldflo, struct xfrm_dst, flo);
1641 num_pols = xdst->num_pols;
1642 num_xfrms = xdst->num_xfrms;
1643 pol_dead = 0;
1644 for (i = 0; i < num_pols; i++) {
1645 pols[i] = xdst->pols[i];
1646 pol_dead |= pols[i]->walk.dead;
1647 }
1648 if (pol_dead) {
1649 dst_free(&xdst->u.dst);
1650 xdst = NULL;
1651 num_pols = 0;
1652 num_xfrms = 0;
1653 oldflo = NULL;
1654 }
1655 }
1656
1657 /* Resolve policies to use if we couldn't get them from
1658 * previous cache entry */
1659 if (xdst == NULL) {
1660 num_pols = 1;
1661 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1662 err = xfrm_expand_policies(fl, family, pols,
1663 &num_pols, &num_xfrms);
1664 if (err < 0)
1665 goto inc_error;
1666 if (num_pols == 0)
1667 return NULL;
1668 if (num_xfrms <= 0)
1669 goto make_dummy_bundle;
1670 }
1671
1672 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1673 if (IS_ERR(new_xdst)) {
1674 err = PTR_ERR(new_xdst);
1675 if (err != -EAGAIN)
1676 goto error;
1677 if (oldflo == NULL)
1678 goto make_dummy_bundle;
1679 dst_hold(&xdst->u.dst);
1680 return oldflo;
1681 } else if (new_xdst == NULL) {
1682 num_xfrms = 0;
1683 if (oldflo == NULL)
1684 goto make_dummy_bundle;
1685 xdst->num_xfrms = 0;
1686 dst_hold(&xdst->u.dst);
1687 return oldflo;
1688 }
1689
1690 /* Kill the previous bundle */
1691 if (xdst) {
1692 /* The policies were stolen for newly generated bundle */
1693 xdst->num_pols = 0;
1694 dst_free(&xdst->u.dst);
1695 }
1696
1697 /* Flow cache does not have reference, it dst_free()'s,
1698 * but we do need to return one reference for original caller */
1699 dst_hold(&new_xdst->u.dst);
1700 return &new_xdst->flo;
1701
1702 make_dummy_bundle:
1703 /* We found policies, but there's no bundles to instantiate:
1704 * either because the policy blocks, has no transformations or
1705 * we could not build template (no xfrm_states).*/
1706 xdst = xfrm_alloc_dst(net, family);
1707 if (IS_ERR(xdst)) {
1708 xfrm_pols_put(pols, num_pols);
1709 return ERR_CAST(xdst);
1710 }
1711 xdst->num_pols = num_pols;
1712 xdst->num_xfrms = num_xfrms;
1713 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1714
1715 dst_hold(&xdst->u.dst);
1716 return &xdst->flo;
1717
1718 inc_error:
1719 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1720 error:
1721 if (xdst != NULL)
1722 dst_free(&xdst->u.dst);
1723 else
1724 xfrm_pols_put(pols, num_pols);
1725 return ERR_PTR(err);
1726 }
1727
1728 /* Main function: finds/creates a bundle for given flow.
1729 *
1730 * At the moment we eat a raw IP route. Mostly to speed up lookups
1731 * on interfaces with disabled IPsec.
1732 */
1733 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1734 struct sock *sk, int flags)
1735 {
1736 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1737 struct flow_cache_object *flo;
1738 struct xfrm_dst *xdst;
1739 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1740 u16 family = dst_orig->ops->family;
1741 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1742 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1743
1744 restart:
1745 dst = NULL;
1746 xdst = NULL;
1747 route = NULL;
1748
1749 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1750 num_pols = 1;
1751 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1752 err = xfrm_expand_policies(fl, family, pols,
1753 &num_pols, &num_xfrms);
1754 if (err < 0)
1755 goto dropdst;
1756
1757 if (num_pols) {
1758 if (num_xfrms <= 0) {
1759 drop_pols = num_pols;
1760 goto no_transform;
1761 }
1762
1763 xdst = xfrm_resolve_and_create_bundle(
1764 pols, num_pols, fl,
1765 family, dst_orig);
1766 if (IS_ERR(xdst)) {
1767 xfrm_pols_put(pols, num_pols);
1768 err = PTR_ERR(xdst);
1769 goto dropdst;
1770 } else if (xdst == NULL) {
1771 num_xfrms = 0;
1772 drop_pols = num_pols;
1773 goto no_transform;
1774 }
1775
1776 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1777 xdst->u.dst.next = xfrm_policy_sk_bundles;
1778 xfrm_policy_sk_bundles = &xdst->u.dst;
1779 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1780
1781 route = xdst->route;
1782 }
1783 }
1784
1785 if (xdst == NULL) {
1786 /* To accelerate a bit... */
1787 if ((dst_orig->flags & DST_NOXFRM) ||
1788 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1789 goto nopol;
1790
1791 flo = flow_cache_lookup(net, fl, family, dir,
1792 xfrm_bundle_lookup, dst_orig);
1793 if (flo == NULL)
1794 goto nopol;
1795 if (IS_ERR(flo)) {
1796 err = PTR_ERR(flo);
1797 goto dropdst;
1798 }
1799 xdst = container_of(flo, struct xfrm_dst, flo);
1800
1801 num_pols = xdst->num_pols;
1802 num_xfrms = xdst->num_xfrms;
1803 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1804 route = xdst->route;
1805 }
1806
1807 dst = &xdst->u.dst;
1808 if (route == NULL && num_xfrms > 0) {
1809 /* The only case when xfrm_bundle_lookup() returns a
1810 * bundle with null route, is when the template could
1811 * not be resolved. It means policies are there, but
1812 * bundle could not be created, since we don't yet
1813 * have the xfrm_state's. We need to wait for KM to
1814 * negotiate new SA's or bail out with error.*/
1815 if (net->xfrm.sysctl_larval_drop) {
1816 /* EREMOTE tells the caller to generate
1817 * a one-shot blackhole route. */
1818 dst_release(dst);
1819 xfrm_pols_put(pols, drop_pols);
1820 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1821 return -EREMOTE;
1822 }
1823 if (flags & XFRM_LOOKUP_WAIT) {
1824 DECLARE_WAITQUEUE(wait, current);
1825
1826 add_wait_queue(&net->xfrm.km_waitq, &wait);
1827 set_current_state(TASK_INTERRUPTIBLE);
1828 schedule();
1829 set_current_state(TASK_RUNNING);
1830 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1831
1832 if (!signal_pending(current)) {
1833 dst_release(dst);
1834 goto restart;
1835 }
1836
1837 err = -ERESTART;
1838 } else
1839 err = -EAGAIN;
1840
1841 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1842 goto error;
1843 }
1844
1845 no_transform:
1846 if (num_pols == 0)
1847 goto nopol;
1848
1849 if ((flags & XFRM_LOOKUP_ICMP) &&
1850 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1851 err = -ENOENT;
1852 goto error;
1853 }
1854
1855 for (i = 0; i < num_pols; i++)
1856 pols[i]->curlft.use_time = get_seconds();
1857
1858 if (num_xfrms < 0) {
1859 /* Prohibit the flow */
1860 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1861 err = -EPERM;
1862 goto error;
1863 } else if (num_xfrms > 0) {
1864 /* Flow transformed */
1865 *dst_p = dst;
1866 dst_release(dst_orig);
1867 } else {
1868 /* Flow passes untransformed */
1869 dst_release(dst);
1870 }
1871 ok:
1872 xfrm_pols_put(pols, drop_pols);
1873 return 0;
1874
1875 nopol:
1876 if (!(flags & XFRM_LOOKUP_ICMP))
1877 goto ok;
1878 err = -ENOENT;
1879 error:
1880 dst_release(dst);
1881 dropdst:
1882 dst_release(dst_orig);
1883 *dst_p = NULL;
1884 xfrm_pols_put(pols, drop_pols);
1885 return err;
1886 }
1887 EXPORT_SYMBOL(__xfrm_lookup);
1888
1889 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1890 struct sock *sk, int flags)
1891 {
1892 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1893
1894 if (err == -EREMOTE) {
1895 dst_release(*dst_p);
1896 *dst_p = NULL;
1897 err = -EAGAIN;
1898 }
1899
1900 return err;
1901 }
1902 EXPORT_SYMBOL(xfrm_lookup);
1903
1904 static inline int
1905 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1906 {
1907 struct xfrm_state *x;
1908
1909 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1910 return 0;
1911 x = skb->sp->xvec[idx];
1912 if (!x->type->reject)
1913 return 0;
1914 return x->type->reject(x, skb, fl);
1915 }
1916
1917 /* When skb is transformed back to its "native" form, we have to
1918 * check policy restrictions. At the moment we make this in maximally
1919 * stupid way. Shame on me. :-) Of course, connected sockets must
1920 * have policy cached at them.
1921 */
1922
1923 static inline int
1924 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1925 unsigned short family)
1926 {
1927 if (xfrm_state_kern(x))
1928 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1929 return x->id.proto == tmpl->id.proto &&
1930 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1931 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1932 x->props.mode == tmpl->mode &&
1933 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1934 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1935 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1936 xfrm_state_addr_cmp(tmpl, x, family));
1937 }
1938
1939 /*
1940 * 0 or more than 0 is returned when validation is succeeded (either bypass
1941 * because of optional transport mode, or next index of the mathced secpath
1942 * state with the template.
1943 * -1 is returned when no matching template is found.
1944 * Otherwise "-2 - errored_index" is returned.
1945 */
1946 static inline int
1947 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1948 unsigned short family)
1949 {
1950 int idx = start;
1951
1952 if (tmpl->optional) {
1953 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1954 return start;
1955 } else
1956 start = -1;
1957 for (; idx < sp->len; idx++) {
1958 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1959 return ++idx;
1960 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1961 if (start == -1)
1962 start = -2-idx;
1963 break;
1964 }
1965 }
1966 return start;
1967 }
1968
1969 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1970 unsigned int family, int reverse)
1971 {
1972 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1973 int err;
1974
1975 if (unlikely(afinfo == NULL))
1976 return -EAFNOSUPPORT;
1977
1978 afinfo->decode_session(skb, fl, reverse);
1979 err = security_xfrm_decode_session(skb, &fl->secid);
1980 xfrm_policy_put_afinfo(afinfo);
1981 return err;
1982 }
1983 EXPORT_SYMBOL(__xfrm_decode_session);
1984
1985 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1986 {
1987 for (; k < sp->len; k++) {
1988 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1989 *idxp = k;
1990 return 1;
1991 }
1992 }
1993
1994 return 0;
1995 }
1996
1997 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1998 unsigned short family)
1999 {
2000 struct net *net = dev_net(skb->dev);
2001 struct xfrm_policy *pol;
2002 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2003 int npols = 0;
2004 int xfrm_nr;
2005 int pi;
2006 int reverse;
2007 struct flowi fl;
2008 u8 fl_dir;
2009 int xerr_idx = -1;
2010
2011 reverse = dir & ~XFRM_POLICY_MASK;
2012 dir &= XFRM_POLICY_MASK;
2013 fl_dir = policy_to_flow_dir(dir);
2014
2015 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2016 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2017 return 0;
2018 }
2019
2020 nf_nat_decode_session(skb, &fl, family);
2021
2022 /* First, check used SA against their selectors. */
2023 if (skb->sp) {
2024 int i;
2025
2026 for (i=skb->sp->len-1; i>=0; i--) {
2027 struct xfrm_state *x = skb->sp->xvec[i];
2028 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2029 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2030 return 0;
2031 }
2032 }
2033 }
2034
2035 pol = NULL;
2036 if (sk && sk->sk_policy[dir]) {
2037 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2038 if (IS_ERR(pol)) {
2039 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2040 return 0;
2041 }
2042 }
2043
2044 if (!pol) {
2045 struct flow_cache_object *flo;
2046
2047 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2048 xfrm_policy_lookup, NULL);
2049 if (IS_ERR_OR_NULL(flo))
2050 pol = ERR_CAST(flo);
2051 else
2052 pol = container_of(flo, struct xfrm_policy, flo);
2053 }
2054
2055 if (IS_ERR(pol)) {
2056 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2057 return 0;
2058 }
2059
2060 if (!pol) {
2061 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2062 xfrm_secpath_reject(xerr_idx, skb, &fl);
2063 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2064 return 0;
2065 }
2066 return 1;
2067 }
2068
2069 pol->curlft.use_time = get_seconds();
2070
2071 pols[0] = pol;
2072 npols ++;
2073 #ifdef CONFIG_XFRM_SUB_POLICY
2074 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2075 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2076 &fl, family,
2077 XFRM_POLICY_IN);
2078 if (pols[1]) {
2079 if (IS_ERR(pols[1])) {
2080 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2081 return 0;
2082 }
2083 pols[1]->curlft.use_time = get_seconds();
2084 npols ++;
2085 }
2086 }
2087 #endif
2088
2089 if (pol->action == XFRM_POLICY_ALLOW) {
2090 struct sec_path *sp;
2091 static struct sec_path dummy;
2092 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2093 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2094 struct xfrm_tmpl **tpp = tp;
2095 int ti = 0;
2096 int i, k;
2097
2098 if ((sp = skb->sp) == NULL)
2099 sp = &dummy;
2100
2101 for (pi = 0; pi < npols; pi++) {
2102 if (pols[pi] != pol &&
2103 pols[pi]->action != XFRM_POLICY_ALLOW) {
2104 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2105 goto reject;
2106 }
2107 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2108 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2109 goto reject_error;
2110 }
2111 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2112 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2113 }
2114 xfrm_nr = ti;
2115 if (npols > 1) {
2116 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2117 tpp = stp;
2118 }
2119
2120 /* For each tunnel xfrm, find the first matching tmpl.
2121 * For each tmpl before that, find corresponding xfrm.
2122 * Order is _important_. Later we will implement
2123 * some barriers, but at the moment barriers
2124 * are implied between each two transformations.
2125 */
2126 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2127 k = xfrm_policy_ok(tpp[i], sp, k, family);
2128 if (k < 0) {
2129 if (k < -1)
2130 /* "-2 - errored_index" returned */
2131 xerr_idx = -(2+k);
2132 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2133 goto reject;
2134 }
2135 }
2136
2137 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2138 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2139 goto reject;
2140 }
2141
2142 xfrm_pols_put(pols, npols);
2143 return 1;
2144 }
2145 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2146
2147 reject:
2148 xfrm_secpath_reject(xerr_idx, skb, &fl);
2149 reject_error:
2150 xfrm_pols_put(pols, npols);
2151 return 0;
2152 }
2153 EXPORT_SYMBOL(__xfrm_policy_check);
2154
2155 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2156 {
2157 struct net *net = dev_net(skb->dev);
2158 struct flowi fl;
2159 struct dst_entry *dst;
2160 int res;
2161
2162 if (xfrm_decode_session(skb, &fl, family) < 0) {
2163 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2164 return 0;
2165 }
2166
2167 skb_dst_force(skb);
2168 dst = skb_dst(skb);
2169
2170 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2171 skb_dst_set(skb, dst);
2172 return res;
2173 }
2174 EXPORT_SYMBOL(__xfrm_route_forward);
2175
2176 /* Optimize later using cookies and generation ids. */
2177
2178 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2179 {
2180 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2181 * to "-1" to force all XFRM destinations to get validated by
2182 * dst_ops->check on every use. We do this because when a
2183 * normal route referenced by an XFRM dst is obsoleted we do
2184 * not go looking around for all parent referencing XFRM dsts
2185 * so that we can invalidate them. It is just too much work.
2186 * Instead we make the checks here on every use. For example:
2187 *
2188 * XFRM dst A --> IPv4 dst X
2189 *
2190 * X is the "xdst->route" of A (X is also the "dst->path" of A
2191 * in this example). If X is marked obsolete, "A" will not
2192 * notice. That's what we are validating here via the
2193 * stale_bundle() check.
2194 *
2195 * When a policy's bundle is pruned, we dst_free() the XFRM
2196 * dst which causes it's ->obsolete field to be set to a
2197 * positive non-zero integer. If an XFRM dst has been pruned
2198 * like this, we want to force a new route lookup.
2199 */
2200 if (dst->obsolete < 0 && !stale_bundle(dst))
2201 return dst;
2202
2203 return NULL;
2204 }
2205
2206 static int stale_bundle(struct dst_entry *dst)
2207 {
2208 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2209 }
2210
2211 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2212 {
2213 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2214 dst->dev = dev_net(dev)->loopback_dev;
2215 dev_hold(dst->dev);
2216 dev_put(dev);
2217 }
2218 }
2219 EXPORT_SYMBOL(xfrm_dst_ifdown);
2220
2221 static void xfrm_link_failure(struct sk_buff *skb)
2222 {
2223 /* Impossible. Such dst must be popped before reaches point of failure. */
2224 }
2225
2226 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2227 {
2228 if (dst) {
2229 if (dst->obsolete) {
2230 dst_release(dst);
2231 dst = NULL;
2232 }
2233 }
2234 return dst;
2235 }
2236
2237 static void __xfrm_garbage_collect(struct net *net)
2238 {
2239 struct dst_entry *head, *next;
2240
2241 flow_cache_flush();
2242
2243 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2244 head = xfrm_policy_sk_bundles;
2245 xfrm_policy_sk_bundles = NULL;
2246 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2247
2248 while (head) {
2249 next = head->next;
2250 dst_free(head);
2251 head = next;
2252 }
2253 }
2254
2255 static void xfrm_init_pmtu(struct dst_entry *dst)
2256 {
2257 do {
2258 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2259 u32 pmtu, route_mtu_cached;
2260
2261 pmtu = dst_mtu(dst->child);
2262 xdst->child_mtu_cached = pmtu;
2263
2264 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2265
2266 route_mtu_cached = dst_mtu(xdst->route);
2267 xdst->route_mtu_cached = route_mtu_cached;
2268
2269 if (pmtu > route_mtu_cached)
2270 pmtu = route_mtu_cached;
2271
2272 dst->metrics[RTAX_MTU-1] = pmtu;
2273 } while ((dst = dst->next));
2274 }
2275
2276 /* Check that the bundle accepts the flow and its components are
2277 * still valid.
2278 */
2279
2280 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2281 struct flowi *fl, int family, int strict)
2282 {
2283 struct dst_entry *dst = &first->u.dst;
2284 struct xfrm_dst *last;
2285 u32 mtu;
2286
2287 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2288 (dst->dev && !netif_running(dst->dev)))
2289 return 0;
2290 #ifdef CONFIG_XFRM_SUB_POLICY
2291 if (fl) {
2292 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2293 return 0;
2294 if (first->partner &&
2295 !xfrm_selector_match(first->partner, fl, family))
2296 return 0;
2297 }
2298 #endif
2299
2300 last = NULL;
2301
2302 do {
2303 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2304
2305 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2306 return 0;
2307 if (fl && pol &&
2308 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2309 return 0;
2310 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2311 return 0;
2312 if (xdst->xfrm_genid != dst->xfrm->genid)
2313 return 0;
2314 if (xdst->num_pols > 0 &&
2315 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2316 return 0;
2317
2318 if (strict && fl &&
2319 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2320 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2321 return 0;
2322
2323 mtu = dst_mtu(dst->child);
2324 if (xdst->child_mtu_cached != mtu) {
2325 last = xdst;
2326 xdst->child_mtu_cached = mtu;
2327 }
2328
2329 if (!dst_check(xdst->route, xdst->route_cookie))
2330 return 0;
2331 mtu = dst_mtu(xdst->route);
2332 if (xdst->route_mtu_cached != mtu) {
2333 last = xdst;
2334 xdst->route_mtu_cached = mtu;
2335 }
2336
2337 dst = dst->child;
2338 } while (dst->xfrm);
2339
2340 if (likely(!last))
2341 return 1;
2342
2343 mtu = last->child_mtu_cached;
2344 for (;;) {
2345 dst = &last->u.dst;
2346
2347 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2348 if (mtu > last->route_mtu_cached)
2349 mtu = last->route_mtu_cached;
2350 dst->metrics[RTAX_MTU-1] = mtu;
2351
2352 if (last == first)
2353 break;
2354
2355 last = (struct xfrm_dst *)last->u.dst.next;
2356 last->child_mtu_cached = mtu;
2357 }
2358
2359 return 1;
2360 }
2361
2362 EXPORT_SYMBOL(xfrm_bundle_ok);
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
Linux kernel - Deliverables
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