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[linux-btrfs-devel.git] / net / xfrm / xfrm_policy.c
blob552df27dcf53d3388fb2eb9ab3ba7a31c7ffcd64
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_dst *xdst);
54
55
56 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
57 int dir);
58
59 static inline int
60 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
61 {
62 const struct flowi4 *fl4 = &fl->u.ip4;
63
64 return addr_match(&fl4->daddr, &sel->daddr, sel->prefixlen_d) &&
65 addr_match(&fl4->saddr, &sel->saddr, sel->prefixlen_s) &&
66 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
67 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
68 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
69 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
70 }
71
72 static inline int
73 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
74 {
75 const struct flowi6 *fl6 = &fl->u.ip6;
76
77 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
78 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
79 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
80 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
81 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
82 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
83 }
84
85 int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
86 unsigned short family)
87 {
88 switch (family) {
89 case AF_INET:
90 return __xfrm4_selector_match(sel, fl);
91 case AF_INET6:
92 return __xfrm6_selector_match(sel, fl);
93 }
94 return 0;
95 }
96
97 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
98 const xfrm_address_t *saddr,
99 const xfrm_address_t *daddr,
100 int family)
101 {
102 struct xfrm_policy_afinfo *afinfo;
103 struct dst_entry *dst;
104
105 afinfo = xfrm_policy_get_afinfo(family);
106 if (unlikely(afinfo == NULL))
107 return ERR_PTR(-EAFNOSUPPORT);
108
109 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
110
111 xfrm_policy_put_afinfo(afinfo);
112
113 return dst;
114 }
115
116 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
117 xfrm_address_t *prev_saddr,
118 xfrm_address_t *prev_daddr,
119 int family)
120 {
121 struct net *net = xs_net(x);
122 xfrm_address_t *saddr = &x->props.saddr;
123 xfrm_address_t *daddr = &x->id.daddr;
124 struct dst_entry *dst;
125
126 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
127 saddr = x->coaddr;
128 daddr = prev_daddr;
129 }
130 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
131 saddr = prev_saddr;
132 daddr = x->coaddr;
133 }
134
135 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
136
137 if (!IS_ERR(dst)) {
138 if (prev_saddr != saddr)
139 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
140 if (prev_daddr != daddr)
141 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
142 }
143
144 return dst;
145 }
146
147 static inline unsigned long make_jiffies(long secs)
148 {
149 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
150 return MAX_SCHEDULE_TIMEOUT-1;
151 else
152 return secs*HZ;
153 }
154
155 static void xfrm_policy_timer(unsigned long data)
156 {
157 struct xfrm_policy *xp = (struct xfrm_policy*)data;
158 unsigned long now = get_seconds();
159 long next = LONG_MAX;
160 int warn = 0;
161 int dir;
162
163 read_lock(&xp->lock);
164
165 if (unlikely(xp->walk.dead))
166 goto out;
167
168 dir = xfrm_policy_id2dir(xp->index);
169
170 if (xp->lft.hard_add_expires_seconds) {
171 long tmo = xp->lft.hard_add_expires_seconds +
172 xp->curlft.add_time - now;
173 if (tmo <= 0)
174 goto expired;
175 if (tmo < next)
176 next = tmo;
177 }
178 if (xp->lft.hard_use_expires_seconds) {
179 long tmo = xp->lft.hard_use_expires_seconds +
180 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
181 if (tmo <= 0)
182 goto expired;
183 if (tmo < next)
184 next = tmo;
185 }
186 if (xp->lft.soft_add_expires_seconds) {
187 long tmo = xp->lft.soft_add_expires_seconds +
188 xp->curlft.add_time - now;
189 if (tmo <= 0) {
190 warn = 1;
191 tmo = XFRM_KM_TIMEOUT;
192 }
193 if (tmo < next)
194 next = tmo;
195 }
196 if (xp->lft.soft_use_expires_seconds) {
197 long tmo = xp->lft.soft_use_expires_seconds +
198 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
199 if (tmo <= 0) {
200 warn = 1;
201 tmo = XFRM_KM_TIMEOUT;
202 }
203 if (tmo < next)
204 next = tmo;
205 }
206
207 if (warn)
208 km_policy_expired(xp, dir, 0, 0);
209 if (next != LONG_MAX &&
210 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
211 xfrm_pol_hold(xp);
212
213 out:
214 read_unlock(&xp->lock);
215 xfrm_pol_put(xp);
216 return;
217
218 expired:
219 read_unlock(&xp->lock);
220 if (!xfrm_policy_delete(xp, dir))
221 km_policy_expired(xp, dir, 1, 0);
222 xfrm_pol_put(xp);
223 }
224
225 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
226 {
227 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
228
229 if (unlikely(pol->walk.dead))
230 flo = NULL;
231 else
232 xfrm_pol_hold(pol);
233
234 return flo;
235 }
236
237 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
238 {
239 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
240
241 return !pol->walk.dead;
242 }
243
244 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
245 {
246 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
247 }
248
249 static const struct flow_cache_ops xfrm_policy_fc_ops = {
250 .get = xfrm_policy_flo_get,
251 .check = xfrm_policy_flo_check,
252 .delete = xfrm_policy_flo_delete,
253 };
254
255 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
256 * SPD calls.
257 */
258
259 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
260 {
261 struct xfrm_policy *policy;
262
263 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
264
265 if (policy) {
266 write_pnet(&policy->xp_net, net);
267 INIT_LIST_HEAD(&policy->walk.all);
268 INIT_HLIST_NODE(&policy->bydst);
269 INIT_HLIST_NODE(&policy->byidx);
270 rwlock_init(&policy->lock);
271 atomic_set(&policy->refcnt, 1);
272 setup_timer(&policy->timer, xfrm_policy_timer,
273 (unsigned long)policy);
274 policy->flo.ops = &xfrm_policy_fc_ops;
275 }
276 return policy;
277 }
278 EXPORT_SYMBOL(xfrm_policy_alloc);
279
280 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
281
282 void xfrm_policy_destroy(struct xfrm_policy *policy)
283 {
284 BUG_ON(!policy->walk.dead);
285
286 if (del_timer(&policy->timer))
287 BUG();
288
289 security_xfrm_policy_free(policy->security);
290 kfree(policy);
291 }
292 EXPORT_SYMBOL(xfrm_policy_destroy);
293
294 /* Rule must be locked. Release descentant resources, announce
295 * entry dead. The rule must be unlinked from lists to the moment.
296 */
297
298 static void xfrm_policy_kill(struct xfrm_policy *policy)
299 {
300 policy->walk.dead = 1;
301
302 atomic_inc(&policy->genid);
303
304 if (del_timer(&policy->timer))
305 xfrm_pol_put(policy);
306
307 xfrm_pol_put(policy);
308 }
309
310 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
311
312 static inline unsigned int idx_hash(struct net *net, u32 index)
313 {
314 return __idx_hash(index, net->xfrm.policy_idx_hmask);
315 }
316
317 static struct hlist_head *policy_hash_bysel(struct net *net,
318 const struct xfrm_selector *sel,
319 unsigned short family, int dir)
320 {
321 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
322 unsigned int hash = __sel_hash(sel, family, hmask);
323
324 return (hash == hmask + 1 ?
325 &net->xfrm.policy_inexact[dir] :
326 net->xfrm.policy_bydst[dir].table + hash);
327 }
328
329 static struct hlist_head *policy_hash_direct(struct net *net,
330 const xfrm_address_t *daddr,
331 const xfrm_address_t *saddr,
332 unsigned short family, int dir)
333 {
334 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
335 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
336
337 return net->xfrm.policy_bydst[dir].table + hash;
338 }
339
340 static void xfrm_dst_hash_transfer(struct hlist_head *list,
341 struct hlist_head *ndsttable,
342 unsigned int nhashmask)
343 {
344 struct hlist_node *entry, *tmp, *entry0 = NULL;
345 struct xfrm_policy *pol;
346 unsigned int h0 = 0;
347
348 redo:
349 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
350 unsigned int h;
351
352 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
353 pol->family, nhashmask);
354 if (!entry0) {
355 hlist_del(entry);
356 hlist_add_head(&pol->bydst, ndsttable+h);
357 h0 = h;
358 } else {
359 if (h != h0)
360 continue;
361 hlist_del(entry);
362 hlist_add_after(entry0, &pol->bydst);
363 }
364 entry0 = entry;
365 }
366 if (!hlist_empty(list)) {
367 entry0 = NULL;
368 goto redo;
369 }
370 }
371
372 static void xfrm_idx_hash_transfer(struct hlist_head *list,
373 struct hlist_head *nidxtable,
374 unsigned int nhashmask)
375 {
376 struct hlist_node *entry, *tmp;
377 struct xfrm_policy *pol;
378
379 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
380 unsigned int h;
381
382 h = __idx_hash(pol->index, nhashmask);
383 hlist_add_head(&pol->byidx, nidxtable+h);
384 }
385 }
386
387 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
388 {
389 return ((old_hmask + 1) << 1) - 1;
390 }
391
392 static void xfrm_bydst_resize(struct net *net, int dir)
393 {
394 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
395 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
396 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
397 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
398 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
399 int i;
400
401 if (!ndst)
402 return;
403
404 write_lock_bh(&xfrm_policy_lock);
405
406 for (i = hmask; i >= 0; i--)
407 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
408
409 net->xfrm.policy_bydst[dir].table = ndst;
410 net->xfrm.policy_bydst[dir].hmask = nhashmask;
411
412 write_unlock_bh(&xfrm_policy_lock);
413
414 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
415 }
416
417 static void xfrm_byidx_resize(struct net *net, int total)
418 {
419 unsigned int hmask = net->xfrm.policy_idx_hmask;
420 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
421 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
422 struct hlist_head *oidx = net->xfrm.policy_byidx;
423 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
424 int i;
425
426 if (!nidx)
427 return;
428
429 write_lock_bh(&xfrm_policy_lock);
430
431 for (i = hmask; i >= 0; i--)
432 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
433
434 net->xfrm.policy_byidx = nidx;
435 net->xfrm.policy_idx_hmask = nhashmask;
436
437 write_unlock_bh(&xfrm_policy_lock);
438
439 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
440 }
441
442 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
443 {
444 unsigned int cnt = net->xfrm.policy_count[dir];
445 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
446
447 if (total)
448 *total += cnt;
449
450 if ((hmask + 1) < xfrm_policy_hashmax &&
451 cnt > hmask)
452 return 1;
453
454 return 0;
455 }
456
457 static inline int xfrm_byidx_should_resize(struct net *net, int total)
458 {
459 unsigned int hmask = net->xfrm.policy_idx_hmask;
460
461 if ((hmask + 1) < xfrm_policy_hashmax &&
462 total > hmask)
463 return 1;
464
465 return 0;
466 }
467
468 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
469 {
470 read_lock_bh(&xfrm_policy_lock);
471 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
472 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
473 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
474 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
475 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
476 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
477 si->spdhcnt = net->xfrm.policy_idx_hmask;
478 si->spdhmcnt = xfrm_policy_hashmax;
479 read_unlock_bh(&xfrm_policy_lock);
480 }
481 EXPORT_SYMBOL(xfrm_spd_getinfo);
482
483 static DEFINE_MUTEX(hash_resize_mutex);
484 static void xfrm_hash_resize(struct work_struct *work)
485 {
486 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
487 int dir, total;
488
489 mutex_lock(&hash_resize_mutex);
490
491 total = 0;
492 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
493 if (xfrm_bydst_should_resize(net, dir, &total))
494 xfrm_bydst_resize(net, dir);
495 }
496 if (xfrm_byidx_should_resize(net, total))
497 xfrm_byidx_resize(net, total);
498
499 mutex_unlock(&hash_resize_mutex);
500 }
501
502 /* Generate new index... KAME seems to generate them ordered by cost
503 * of an absolute inpredictability of ordering of rules. This will not pass. */
504 static u32 xfrm_gen_index(struct net *net, int dir)
505 {
506 static u32 idx_generator;
507
508 for (;;) {
509 struct hlist_node *entry;
510 struct hlist_head *list;
511 struct xfrm_policy *p;
512 u32 idx;
513 int found;
514
515 idx = (idx_generator | dir);
516 idx_generator += 8;
517 if (idx == 0)
518 idx = 8;
519 list = net->xfrm.policy_byidx + idx_hash(net, idx);
520 found = 0;
521 hlist_for_each_entry(p, entry, list, byidx) {
522 if (p->index == idx) {
523 found = 1;
524 break;
525 }
526 }
527 if (!found)
528 return idx;
529 }
530 }
531
532 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
533 {
534 u32 *p1 = (u32 *) s1;
535 u32 *p2 = (u32 *) s2;
536 int len = sizeof(struct xfrm_selector) / sizeof(u32);
537 int i;
538
539 for (i = 0; i < len; i++) {
540 if (p1[i] != p2[i])
541 return 1;
542 }
543
544 return 0;
545 }
546
547 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
548 {
549 struct net *net = xp_net(policy);
550 struct xfrm_policy *pol;
551 struct xfrm_policy *delpol;
552 struct hlist_head *chain;
553 struct hlist_node *entry, *newpos;
554 u32 mark = policy->mark.v & policy->mark.m;
555
556 write_lock_bh(&xfrm_policy_lock);
557 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
558 delpol = NULL;
559 newpos = NULL;
560 hlist_for_each_entry(pol, entry, chain, bydst) {
561 if (pol->type == policy->type &&
562 !selector_cmp(&pol->selector, &policy->selector) &&
563 (mark & pol->mark.m) == pol->mark.v &&
564 xfrm_sec_ctx_match(pol->security, policy->security) &&
565 !WARN_ON(delpol)) {
566 if (excl) {
567 write_unlock_bh(&xfrm_policy_lock);
568 return -EEXIST;
569 }
570 delpol = pol;
571 if (policy->priority > pol->priority)
572 continue;
573 } else if (policy->priority >= pol->priority) {
574 newpos = &pol->bydst;
575 continue;
576 }
577 if (delpol)
578 break;
579 }
580 if (newpos)
581 hlist_add_after(newpos, &policy->bydst);
582 else
583 hlist_add_head(&policy->bydst, chain);
584 xfrm_pol_hold(policy);
585 net->xfrm.policy_count[dir]++;
586 atomic_inc(&flow_cache_genid);
587 if (delpol)
588 __xfrm_policy_unlink(delpol, dir);
589 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
590 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
591 policy->curlft.add_time = get_seconds();
592 policy->curlft.use_time = 0;
593 if (!mod_timer(&policy->timer, jiffies + HZ))
594 xfrm_pol_hold(policy);
595 list_add(&policy->walk.all, &net->xfrm.policy_all);
596 write_unlock_bh(&xfrm_policy_lock);
597
598 if (delpol)
599 xfrm_policy_kill(delpol);
600 else if (xfrm_bydst_should_resize(net, dir, NULL))
601 schedule_work(&net->xfrm.policy_hash_work);
602
603 return 0;
604 }
605 EXPORT_SYMBOL(xfrm_policy_insert);
606
607 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
608 int dir, struct xfrm_selector *sel,
609 struct xfrm_sec_ctx *ctx, int delete,
610 int *err)
611 {
612 struct xfrm_policy *pol, *ret;
613 struct hlist_head *chain;
614 struct hlist_node *entry;
615
616 *err = 0;
617 write_lock_bh(&xfrm_policy_lock);
618 chain = policy_hash_bysel(net, sel, sel->family, dir);
619 ret = NULL;
620 hlist_for_each_entry(pol, entry, chain, bydst) {
621 if (pol->type == type &&
622 (mark & pol->mark.m) == pol->mark.v &&
623 !selector_cmp(sel, &pol->selector) &&
624 xfrm_sec_ctx_match(ctx, pol->security)) {
625 xfrm_pol_hold(pol);
626 if (delete) {
627 *err = security_xfrm_policy_delete(
628 pol->security);
629 if (*err) {
630 write_unlock_bh(&xfrm_policy_lock);
631 return pol;
632 }
633 __xfrm_policy_unlink(pol, dir);
634 }
635 ret = pol;
636 break;
637 }
638 }
639 write_unlock_bh(&xfrm_policy_lock);
640
641 if (ret && delete)
642 xfrm_policy_kill(ret);
643 return ret;
644 }
645 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
646
647 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
648 int dir, u32 id, int delete, int *err)
649 {
650 struct xfrm_policy *pol, *ret;
651 struct hlist_head *chain;
652 struct hlist_node *entry;
653
654 *err = -ENOENT;
655 if (xfrm_policy_id2dir(id) != dir)
656 return NULL;
657
658 *err = 0;
659 write_lock_bh(&xfrm_policy_lock);
660 chain = net->xfrm.policy_byidx + idx_hash(net, id);
661 ret = NULL;
662 hlist_for_each_entry(pol, entry, chain, byidx) {
663 if (pol->type == type && pol->index == id &&
664 (mark & pol->mark.m) == pol->mark.v) {
665 xfrm_pol_hold(pol);
666 if (delete) {
667 *err = security_xfrm_policy_delete(
668 pol->security);
669 if (*err) {
670 write_unlock_bh(&xfrm_policy_lock);
671 return pol;
672 }
673 __xfrm_policy_unlink(pol, dir);
674 }
675 ret = pol;
676 break;
677 }
678 }
679 write_unlock_bh(&xfrm_policy_lock);
680
681 if (ret && delete)
682 xfrm_policy_kill(ret);
683 return ret;
684 }
685 EXPORT_SYMBOL(xfrm_policy_byid);
686
687 #ifdef CONFIG_SECURITY_NETWORK_XFRM
688 static inline int
689 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
690 {
691 int dir, err = 0;
692
693 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
694 struct xfrm_policy *pol;
695 struct hlist_node *entry;
696 int i;
697
698 hlist_for_each_entry(pol, entry,
699 &net->xfrm.policy_inexact[dir], bydst) {
700 if (pol->type != type)
701 continue;
702 err = security_xfrm_policy_delete(pol->security);
703 if (err) {
704 xfrm_audit_policy_delete(pol, 0,
705 audit_info->loginuid,
706 audit_info->sessionid,
707 audit_info->secid);
708 return err;
709 }
710 }
711 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
712 hlist_for_each_entry(pol, entry,
713 net->xfrm.policy_bydst[dir].table + i,
714 bydst) {
715 if (pol->type != type)
716 continue;
717 err = security_xfrm_policy_delete(
718 pol->security);
719 if (err) {
720 xfrm_audit_policy_delete(pol, 0,
721 audit_info->loginuid,
722 audit_info->sessionid,
723 audit_info->secid);
724 return err;
725 }
726 }
727 }
728 }
729 return err;
730 }
731 #else
732 static inline int
733 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
734 {
735 return 0;
736 }
737 #endif
738
739 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
740 {
741 int dir, err = 0, cnt = 0;
742
743 write_lock_bh(&xfrm_policy_lock);
744
745 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
746 if (err)
747 goto out;
748
749 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
750 struct xfrm_policy *pol;
751 struct hlist_node *entry;
752 int i;
753
754 again1:
755 hlist_for_each_entry(pol, entry,
756 &net->xfrm.policy_inexact[dir], bydst) {
757 if (pol->type != type)
758 continue;
759 __xfrm_policy_unlink(pol, dir);
760 write_unlock_bh(&xfrm_policy_lock);
761 cnt++;
762
763 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
764 audit_info->sessionid,
765 audit_info->secid);
766
767 xfrm_policy_kill(pol);
768
769 write_lock_bh(&xfrm_policy_lock);
770 goto again1;
771 }
772
773 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
774 again2:
775 hlist_for_each_entry(pol, entry,
776 net->xfrm.policy_bydst[dir].table + i,
777 bydst) {
778 if (pol->type != type)
779 continue;
780 __xfrm_policy_unlink(pol, dir);
781 write_unlock_bh(&xfrm_policy_lock);
782 cnt++;
783
784 xfrm_audit_policy_delete(pol, 1,
785 audit_info->loginuid,
786 audit_info->sessionid,
787 audit_info->secid);
788 xfrm_policy_kill(pol);
789
790 write_lock_bh(&xfrm_policy_lock);
791 goto again2;
792 }
793 }
794
795 }
796 if (!cnt)
797 err = -ESRCH;
798 out:
799 write_unlock_bh(&xfrm_policy_lock);
800 return err;
801 }
802 EXPORT_SYMBOL(xfrm_policy_flush);
803
804 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
805 int (*func)(struct xfrm_policy *, int, int, void*),
806 void *data)
807 {
808 struct xfrm_policy *pol;
809 struct xfrm_policy_walk_entry *x;
810 int error = 0;
811
812 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
813 walk->type != XFRM_POLICY_TYPE_ANY)
814 return -EINVAL;
815
816 if (list_empty(&walk->walk.all) && walk->seq != 0)
817 return 0;
818
819 write_lock_bh(&xfrm_policy_lock);
820 if (list_empty(&walk->walk.all))
821 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
822 else
823 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
824 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
825 if (x->dead)
826 continue;
827 pol = container_of(x, struct xfrm_policy, walk);
828 if (walk->type != XFRM_POLICY_TYPE_ANY &&
829 walk->type != pol->type)
830 continue;
831 error = func(pol, xfrm_policy_id2dir(pol->index),
832 walk->seq, data);
833 if (error) {
834 list_move_tail(&walk->walk.all, &x->all);
835 goto out;
836 }
837 walk->seq++;
838 }
839 if (walk->seq == 0) {
840 error = -ENOENT;
841 goto out;
842 }
843 list_del_init(&walk->walk.all);
844 out:
845 write_unlock_bh(&xfrm_policy_lock);
846 return error;
847 }
848 EXPORT_SYMBOL(xfrm_policy_walk);
849
850 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
851 {
852 INIT_LIST_HEAD(&walk->walk.all);
853 walk->walk.dead = 1;
854 walk->type = type;
855 walk->seq = 0;
856 }
857 EXPORT_SYMBOL(xfrm_policy_walk_init);
858
859 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
860 {
861 if (list_empty(&walk->walk.all))
862 return;
863
864 write_lock_bh(&xfrm_policy_lock);
865 list_del(&walk->walk.all);
866 write_unlock_bh(&xfrm_policy_lock);
867 }
868 EXPORT_SYMBOL(xfrm_policy_walk_done);
869
870 /*
871 * Find policy to apply to this flow.
872 *
873 * Returns 0 if policy found, else an -errno.
874 */
875 static int xfrm_policy_match(const struct xfrm_policy *pol,
876 const struct flowi *fl,
877 u8 type, u16 family, int dir)
878 {
879 const struct xfrm_selector *sel = &pol->selector;
880 int match, ret = -ESRCH;
881
882 if (pol->family != family ||
883 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
884 pol->type != type)
885 return ret;
886
887 match = xfrm_selector_match(sel, fl, family);
888 if (match)
889 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
890 dir);
891
892 return ret;
893 }
894
895 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
896 const struct flowi *fl,
897 u16 family, u8 dir)
898 {
899 int err;
900 struct xfrm_policy *pol, *ret;
901 const xfrm_address_t *daddr, *saddr;
902 struct hlist_node *entry;
903 struct hlist_head *chain;
904 u32 priority = ~0U;
905
906 daddr = xfrm_flowi_daddr(fl, family);
907 saddr = xfrm_flowi_saddr(fl, family);
908 if (unlikely(!daddr || !saddr))
909 return NULL;
910
911 read_lock_bh(&xfrm_policy_lock);
912 chain = policy_hash_direct(net, daddr, saddr, family, dir);
913 ret = NULL;
914 hlist_for_each_entry(pol, entry, chain, bydst) {
915 err = xfrm_policy_match(pol, fl, type, family, dir);
916 if (err) {
917 if (err == -ESRCH)
918 continue;
919 else {
920 ret = ERR_PTR(err);
921 goto fail;
922 }
923 } else {
924 ret = pol;
925 priority = ret->priority;
926 break;
927 }
928 }
929 chain = &net->xfrm.policy_inexact[dir];
930 hlist_for_each_entry(pol, entry, chain, bydst) {
931 err = xfrm_policy_match(pol, fl, type, family, dir);
932 if (err) {
933 if (err == -ESRCH)
934 continue;
935 else {
936 ret = ERR_PTR(err);
937 goto fail;
938 }
939 } else if (pol->priority < priority) {
940 ret = pol;
941 break;
942 }
943 }
944 if (ret)
945 xfrm_pol_hold(ret);
946 fail:
947 read_unlock_bh(&xfrm_policy_lock);
948
949 return ret;
950 }
951
952 static struct xfrm_policy *
953 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
954 {
955 #ifdef CONFIG_XFRM_SUB_POLICY
956 struct xfrm_policy *pol;
957
958 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
959 if (pol != NULL)
960 return pol;
961 #endif
962 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
963 }
964
965 static struct flow_cache_object *
966 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
967 u8 dir, struct flow_cache_object *old_obj, void *ctx)
968 {
969 struct xfrm_policy *pol;
970
971 if (old_obj)
972 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
973
974 pol = __xfrm_policy_lookup(net, fl, family, dir);
975 if (IS_ERR_OR_NULL(pol))
976 return ERR_CAST(pol);
977
978 /* Resolver returns two references:
979 * one for cache and one for caller of flow_cache_lookup() */
980 xfrm_pol_hold(pol);
981
982 return &pol->flo;
983 }
984
985 static inline int policy_to_flow_dir(int dir)
986 {
987 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
988 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
989 XFRM_POLICY_FWD == FLOW_DIR_FWD)
990 return dir;
991 switch (dir) {
992 default:
993 case XFRM_POLICY_IN:
994 return FLOW_DIR_IN;
995 case XFRM_POLICY_OUT:
996 return FLOW_DIR_OUT;
997 case XFRM_POLICY_FWD:
998 return FLOW_DIR_FWD;
999 }
1000 }
1001
1002 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1003 const struct flowi *fl)
1004 {
1005 struct xfrm_policy *pol;
1006
1007 read_lock_bh(&xfrm_policy_lock);
1008 if ((pol = sk->sk_policy[dir]) != NULL) {
1009 int match = xfrm_selector_match(&pol->selector, fl,
1010 sk->sk_family);
1011 int err = 0;
1012
1013 if (match) {
1014 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1015 pol = NULL;
1016 goto out;
1017 }
1018 err = security_xfrm_policy_lookup(pol->security,
1019 fl->flowi_secid,
1020 policy_to_flow_dir(dir));
1021 if (!err)
1022 xfrm_pol_hold(pol);
1023 else if (err == -ESRCH)
1024 pol = NULL;
1025 else
1026 pol = ERR_PTR(err);
1027 } else
1028 pol = NULL;
1029 }
1030 out:
1031 read_unlock_bh(&xfrm_policy_lock);
1032 return pol;
1033 }
1034
1035 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1036 {
1037 struct net *net = xp_net(pol);
1038 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1039 pol->family, dir);
1040
1041 list_add(&pol->walk.all, &net->xfrm.policy_all);
1042 hlist_add_head(&pol->bydst, chain);
1043 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1044 net->xfrm.policy_count[dir]++;
1045 xfrm_pol_hold(pol);
1046
1047 if (xfrm_bydst_should_resize(net, dir, NULL))
1048 schedule_work(&net->xfrm.policy_hash_work);
1049 }
1050
1051 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1052 int dir)
1053 {
1054 struct net *net = xp_net(pol);
1055
1056 if (hlist_unhashed(&pol->bydst))
1057 return NULL;
1058
1059 hlist_del(&pol->bydst);
1060 hlist_del(&pol->byidx);
1061 list_del(&pol->walk.all);
1062 net->xfrm.policy_count[dir]--;
1063
1064 return pol;
1065 }
1066
1067 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1068 {
1069 write_lock_bh(&xfrm_policy_lock);
1070 pol = __xfrm_policy_unlink(pol, dir);
1071 write_unlock_bh(&xfrm_policy_lock);
1072 if (pol) {
1073 xfrm_policy_kill(pol);
1074 return 0;
1075 }
1076 return -ENOENT;
1077 }
1078 EXPORT_SYMBOL(xfrm_policy_delete);
1079
1080 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1081 {
1082 struct net *net = xp_net(pol);
1083 struct xfrm_policy *old_pol;
1084
1085 #ifdef CONFIG_XFRM_SUB_POLICY
1086 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1087 return -EINVAL;
1088 #endif
1089
1090 write_lock_bh(&xfrm_policy_lock);
1091 old_pol = sk->sk_policy[dir];
1092 sk->sk_policy[dir] = pol;
1093 if (pol) {
1094 pol->curlft.add_time = get_seconds();
1095 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1096 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1097 }
1098 if (old_pol)
1099 /* Unlinking succeeds always. This is the only function
1100 * allowed to delete or replace socket policy.
1101 */
1102 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1103 write_unlock_bh(&xfrm_policy_lock);
1104
1105 if (old_pol) {
1106 xfrm_policy_kill(old_pol);
1107 }
1108 return 0;
1109 }
1110
1111 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1112 {
1113 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1114
1115 if (newp) {
1116 newp->selector = old->selector;
1117 if (security_xfrm_policy_clone(old->security,
1118 &newp->security)) {
1119 kfree(newp);
1120 return NULL; /* ENOMEM */
1121 }
1122 newp->lft = old->lft;
1123 newp->curlft = old->curlft;
1124 newp->mark = old->mark;
1125 newp->action = old->action;
1126 newp->flags = old->flags;
1127 newp->xfrm_nr = old->xfrm_nr;
1128 newp->index = old->index;
1129 newp->type = old->type;
1130 memcpy(newp->xfrm_vec, old->xfrm_vec,
1131 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1132 write_lock_bh(&xfrm_policy_lock);
1133 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1134 write_unlock_bh(&xfrm_policy_lock);
1135 xfrm_pol_put(newp);
1136 }
1137 return newp;
1138 }
1139
1140 int __xfrm_sk_clone_policy(struct sock *sk)
1141 {
1142 struct xfrm_policy *p0 = sk->sk_policy[0],
1143 *p1 = sk->sk_policy[1];
1144
1145 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1146 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1147 return -ENOMEM;
1148 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1149 return -ENOMEM;
1150 return 0;
1151 }
1152
1153 static int
1154 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1155 unsigned short family)
1156 {
1157 int err;
1158 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1159
1160 if (unlikely(afinfo == NULL))
1161 return -EINVAL;
1162 err = afinfo->get_saddr(net, local, remote);
1163 xfrm_policy_put_afinfo(afinfo);
1164 return err;
1165 }
1166
1167 /* Resolve list of templates for the flow, given policy. */
1168
1169 static int
1170 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1171 struct xfrm_state **xfrm, unsigned short family)
1172 {
1173 struct net *net = xp_net(policy);
1174 int nx;
1175 int i, error;
1176 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1177 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1178 xfrm_address_t tmp;
1179
1180 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1181 struct xfrm_state *x;
1182 xfrm_address_t *remote = daddr;
1183 xfrm_address_t *local = saddr;
1184 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1185
1186 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1187 tmpl->mode == XFRM_MODE_BEET) {
1188 remote = &tmpl->id.daddr;
1189 local = &tmpl->saddr;
1190 if (xfrm_addr_any(local, tmpl->encap_family)) {
1191 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1192 if (error)
1193 goto fail;
1194 local = &tmp;
1195 }
1196 }
1197
1198 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1199
1200 if (x && x->km.state == XFRM_STATE_VALID) {
1201 xfrm[nx++] = x;
1202 daddr = remote;
1203 saddr = local;
1204 continue;
1205 }
1206 if (x) {
1207 error = (x->km.state == XFRM_STATE_ERROR ?
1208 -EINVAL : -EAGAIN);
1209 xfrm_state_put(x);
1210 }
1211 else if (error == -ESRCH)
1212 error = -EAGAIN;
1213
1214 if (!tmpl->optional)
1215 goto fail;
1216 }
1217 return nx;
1218
1219 fail:
1220 for (nx--; nx>=0; nx--)
1221 xfrm_state_put(xfrm[nx]);
1222 return error;
1223 }
1224
1225 static int
1226 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1227 struct xfrm_state **xfrm, unsigned short family)
1228 {
1229 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1230 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1231 int cnx = 0;
1232 int error;
1233 int ret;
1234 int i;
1235
1236 for (i = 0; i < npols; i++) {
1237 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1238 error = -ENOBUFS;
1239 goto fail;
1240 }
1241
1242 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1243 if (ret < 0) {
1244 error = ret;
1245 goto fail;
1246 } else
1247 cnx += ret;
1248 }
1249
1250 /* found states are sorted for outbound processing */
1251 if (npols > 1)
1252 xfrm_state_sort(xfrm, tpp, cnx, family);
1253
1254 return cnx;
1255
1256 fail:
1257 for (cnx--; cnx>=0; cnx--)
1258 xfrm_state_put(tpp[cnx]);
1259 return error;
1260
1261 }
1262
1263 /* Check that the bundle accepts the flow and its components are
1264 * still valid.
1265 */
1266
1267 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1268 {
1269 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1270 int tos;
1271
1272 if (!afinfo)
1273 return -EINVAL;
1274
1275 tos = afinfo->get_tos(fl);
1276
1277 xfrm_policy_put_afinfo(afinfo);
1278
1279 return tos;
1280 }
1281
1282 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1283 {
1284 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1285 struct dst_entry *dst = &xdst->u.dst;
1286
1287 if (xdst->route == NULL) {
1288 /* Dummy bundle - if it has xfrms we were not
1289 * able to build bundle as template resolution failed.
1290 * It means we need to try again resolving. */
1291 if (xdst->num_xfrms > 0)
1292 return NULL;
1293 } else {
1294 /* Real bundle */
1295 if (stale_bundle(dst))
1296 return NULL;
1297 }
1298
1299 dst_hold(dst);
1300 return flo;
1301 }
1302
1303 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1304 {
1305 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1306 struct dst_entry *dst = &xdst->u.dst;
1307
1308 if (!xdst->route)
1309 return 0;
1310 if (stale_bundle(dst))
1311 return 0;
1312
1313 return 1;
1314 }
1315
1316 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1317 {
1318 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1319 struct dst_entry *dst = &xdst->u.dst;
1320
1321 dst_free(dst);
1322 }
1323
1324 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1325 .get = xfrm_bundle_flo_get,
1326 .check = xfrm_bundle_flo_check,
1327 .delete = xfrm_bundle_flo_delete,
1328 };
1329
1330 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1331 {
1332 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1333 struct dst_ops *dst_ops;
1334 struct xfrm_dst *xdst;
1335
1336 if (!afinfo)
1337 return ERR_PTR(-EINVAL);
1338
1339 switch (family) {
1340 case AF_INET:
1341 dst_ops = &net->xfrm.xfrm4_dst_ops;
1342 break;
1343 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1344 case AF_INET6:
1345 dst_ops = &net->xfrm.xfrm6_dst_ops;
1346 break;
1347 #endif
1348 default:
1349 BUG();
1350 }
1351 xdst = dst_alloc(dst_ops, NULL, 0, 0, 0);
1352
1353 if (likely(xdst)) {
1354 memset(&xdst->u.rt6.rt6i_table, 0,
1355 sizeof(*xdst) - sizeof(struct dst_entry));
1356 xdst->flo.ops = &xfrm_bundle_fc_ops;
1357 } else
1358 xdst = ERR_PTR(-ENOBUFS);
1359
1360 xfrm_policy_put_afinfo(afinfo);
1361
1362 return xdst;
1363 }
1364
1365 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1366 int nfheader_len)
1367 {
1368 struct xfrm_policy_afinfo *afinfo =
1369 xfrm_policy_get_afinfo(dst->ops->family);
1370 int err;
1371
1372 if (!afinfo)
1373 return -EINVAL;
1374
1375 err = afinfo->init_path(path, dst, nfheader_len);
1376
1377 xfrm_policy_put_afinfo(afinfo);
1378
1379 return err;
1380 }
1381
1382 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1383 const struct flowi *fl)
1384 {
1385 struct xfrm_policy_afinfo *afinfo =
1386 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1387 int err;
1388
1389 if (!afinfo)
1390 return -EINVAL;
1391
1392 err = afinfo->fill_dst(xdst, dev, fl);
1393
1394 xfrm_policy_put_afinfo(afinfo);
1395
1396 return err;
1397 }
1398
1399
1400 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1401 * all the metrics... Shortly, bundle a bundle.
1402 */
1403
1404 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1405 struct xfrm_state **xfrm, int nx,
1406 const struct flowi *fl,
1407 struct dst_entry *dst)
1408 {
1409 struct net *net = xp_net(policy);
1410 unsigned long now = jiffies;
1411 struct net_device *dev;
1412 struct xfrm_mode *inner_mode;
1413 struct dst_entry *dst_prev = NULL;
1414 struct dst_entry *dst0 = NULL;
1415 int i = 0;
1416 int err;
1417 int header_len = 0;
1418 int nfheader_len = 0;
1419 int trailer_len = 0;
1420 int tos;
1421 int family = policy->selector.family;
1422 xfrm_address_t saddr, daddr;
1423
1424 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1425
1426 tos = xfrm_get_tos(fl, family);
1427 err = tos;
1428 if (tos < 0)
1429 goto put_states;
1430
1431 dst_hold(dst);
1432
1433 for (; i < nx; i++) {
1434 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1435 struct dst_entry *dst1 = &xdst->u.dst;
1436
1437 err = PTR_ERR(xdst);
1438 if (IS_ERR(xdst)) {
1439 dst_release(dst);
1440 goto put_states;
1441 }
1442
1443 if (xfrm[i]->sel.family == AF_UNSPEC) {
1444 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1445 xfrm_af2proto(family));
1446 if (!inner_mode) {
1447 err = -EAFNOSUPPORT;
1448 dst_release(dst);
1449 goto put_states;
1450 }
1451 } else
1452 inner_mode = xfrm[i]->inner_mode;
1453
1454 if (!dst_prev)
1455 dst0 = dst1;
1456 else {
1457 dst_prev->child = dst_clone(dst1);
1458 dst1->flags |= DST_NOHASH;
1459 }
1460
1461 xdst->route = dst;
1462 dst_copy_metrics(dst1, dst);
1463
1464 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1465 family = xfrm[i]->props.family;
1466 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1467 family);
1468 err = PTR_ERR(dst);
1469 if (IS_ERR(dst))
1470 goto put_states;
1471 } else
1472 dst_hold(dst);
1473
1474 dst1->xfrm = xfrm[i];
1475 xdst->xfrm_genid = xfrm[i]->genid;
1476
1477 dst1->obsolete = -1;
1478 dst1->flags |= DST_HOST;
1479 dst1->lastuse = now;
1480
1481 dst1->input = dst_discard;
1482 dst1->output = inner_mode->afinfo->output;
1483
1484 dst1->next = dst_prev;
1485 dst_prev = dst1;
1486
1487 header_len += xfrm[i]->props.header_len;
1488 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1489 nfheader_len += xfrm[i]->props.header_len;
1490 trailer_len += xfrm[i]->props.trailer_len;
1491 }
1492
1493 dst_prev->child = dst;
1494 dst0->path = dst;
1495
1496 err = -ENODEV;
1497 dev = dst->dev;
1498 if (!dev)
1499 goto free_dst;
1500
1501 /* Copy neighbour for reachability confirmation */
1502 dst_set_neighbour(dst0, neigh_clone(dst_get_neighbour(dst)));
1503
1504 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1505 xfrm_init_pmtu(dst_prev);
1506
1507 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1508 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1509
1510 err = xfrm_fill_dst(xdst, dev, fl);
1511 if (err)
1512 goto free_dst;
1513
1514 dst_prev->header_len = header_len;
1515 dst_prev->trailer_len = trailer_len;
1516 header_len -= xdst->u.dst.xfrm->props.header_len;
1517 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1518 }
1519
1520 out:
1521 return dst0;
1522
1523 put_states:
1524 for (; i < nx; i++)
1525 xfrm_state_put(xfrm[i]);
1526 free_dst:
1527 if (dst0)
1528 dst_free(dst0);
1529 dst0 = ERR_PTR(err);
1530 goto out;
1531 }
1532
1533 static int inline
1534 xfrm_dst_alloc_copy(void **target, const void *src, int size)
1535 {
1536 if (!*target) {
1537 *target = kmalloc(size, GFP_ATOMIC);
1538 if (!*target)
1539 return -ENOMEM;
1540 }
1541 memcpy(*target, src, size);
1542 return 0;
1543 }
1544
1545 static int inline
1546 xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel)
1547 {
1548 #ifdef CONFIG_XFRM_SUB_POLICY
1549 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1550 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1551 sel, sizeof(*sel));
1552 #else
1553 return 0;
1554 #endif
1555 }
1556
1557 static int inline
1558 xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl)
1559 {
1560 #ifdef CONFIG_XFRM_SUB_POLICY
1561 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1562 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1563 #else
1564 return 0;
1565 #endif
1566 }
1567
1568 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1569 struct xfrm_policy **pols,
1570 int *num_pols, int *num_xfrms)
1571 {
1572 int i;
1573
1574 if (*num_pols == 0 || !pols[0]) {
1575 *num_pols = 0;
1576 *num_xfrms = 0;
1577 return 0;
1578 }
1579 if (IS_ERR(pols[0]))
1580 return PTR_ERR(pols[0]);
1581
1582 *num_xfrms = pols[0]->xfrm_nr;
1583
1584 #ifdef CONFIG_XFRM_SUB_POLICY
1585 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1586 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1587 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1588 XFRM_POLICY_TYPE_MAIN,
1589 fl, family,
1590 XFRM_POLICY_OUT);
1591 if (pols[1]) {
1592 if (IS_ERR(pols[1])) {
1593 xfrm_pols_put(pols, *num_pols);
1594 return PTR_ERR(pols[1]);
1595 }
1596 (*num_pols) ++;
1597 (*num_xfrms) += pols[1]->xfrm_nr;
1598 }
1599 }
1600 #endif
1601 for (i = 0; i < *num_pols; i++) {
1602 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1603 *num_xfrms = -1;
1604 break;
1605 }
1606 }
1607
1608 return 0;
1609
1610 }
1611
1612 static struct xfrm_dst *
1613 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1614 const struct flowi *fl, u16 family,
1615 struct dst_entry *dst_orig)
1616 {
1617 struct net *net = xp_net(pols[0]);
1618 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1619 struct dst_entry *dst;
1620 struct xfrm_dst *xdst;
1621 int err;
1622
1623 /* Try to instantiate a bundle */
1624 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1625 if (err <= 0) {
1626 if (err != 0 && err != -EAGAIN)
1627 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1628 return ERR_PTR(err);
1629 }
1630
1631 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1632 if (IS_ERR(dst)) {
1633 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1634 return ERR_CAST(dst);
1635 }
1636
1637 xdst = (struct xfrm_dst *)dst;
1638 xdst->num_xfrms = err;
1639 if (num_pols > 1)
1640 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1641 else
1642 err = xfrm_dst_update_origin(dst, fl);
1643 if (unlikely(err)) {
1644 dst_free(dst);
1645 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1646 return ERR_PTR(err);
1647 }
1648
1649 xdst->num_pols = num_pols;
1650 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1651 xdst->policy_genid = atomic_read(&pols[0]->genid);
1652
1653 return xdst;
1654 }
1655
1656 static struct flow_cache_object *
1657 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1658 struct flow_cache_object *oldflo, void *ctx)
1659 {
1660 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1661 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1662 struct xfrm_dst *xdst, *new_xdst;
1663 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1664
1665 /* Check if the policies from old bundle are usable */
1666 xdst = NULL;
1667 if (oldflo) {
1668 xdst = container_of(oldflo, struct xfrm_dst, flo);
1669 num_pols = xdst->num_pols;
1670 num_xfrms = xdst->num_xfrms;
1671 pol_dead = 0;
1672 for (i = 0; i < num_pols; i++) {
1673 pols[i] = xdst->pols[i];
1674 pol_dead |= pols[i]->walk.dead;
1675 }
1676 if (pol_dead) {
1677 dst_free(&xdst->u.dst);
1678 xdst = NULL;
1679 num_pols = 0;
1680 num_xfrms = 0;
1681 oldflo = NULL;
1682 }
1683 }
1684
1685 /* Resolve policies to use if we couldn't get them from
1686 * previous cache entry */
1687 if (xdst == NULL) {
1688 num_pols = 1;
1689 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1690 err = xfrm_expand_policies(fl, family, pols,
1691 &num_pols, &num_xfrms);
1692 if (err < 0)
1693 goto inc_error;
1694 if (num_pols == 0)
1695 return NULL;
1696 if (num_xfrms <= 0)
1697 goto make_dummy_bundle;
1698 }
1699
1700 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1701 if (IS_ERR(new_xdst)) {
1702 err = PTR_ERR(new_xdst);
1703 if (err != -EAGAIN)
1704 goto error;
1705 if (oldflo == NULL)
1706 goto make_dummy_bundle;
1707 dst_hold(&xdst->u.dst);
1708 return oldflo;
1709 } else if (new_xdst == NULL) {
1710 num_xfrms = 0;
1711 if (oldflo == NULL)
1712 goto make_dummy_bundle;
1713 xdst->num_xfrms = 0;
1714 dst_hold(&xdst->u.dst);
1715 return oldflo;
1716 }
1717
1718 /* Kill the previous bundle */
1719 if (xdst) {
1720 /* The policies were stolen for newly generated bundle */
1721 xdst->num_pols = 0;
1722 dst_free(&xdst->u.dst);
1723 }
1724
1725 /* Flow cache does not have reference, it dst_free()'s,
1726 * but we do need to return one reference for original caller */
1727 dst_hold(&new_xdst->u.dst);
1728 return &new_xdst->flo;
1729
1730 make_dummy_bundle:
1731 /* We found policies, but there's no bundles to instantiate:
1732 * either because the policy blocks, has no transformations or
1733 * we could not build template (no xfrm_states).*/
1734 xdst = xfrm_alloc_dst(net, family);
1735 if (IS_ERR(xdst)) {
1736 xfrm_pols_put(pols, num_pols);
1737 return ERR_CAST(xdst);
1738 }
1739 xdst->num_pols = num_pols;
1740 xdst->num_xfrms = num_xfrms;
1741 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1742
1743 dst_hold(&xdst->u.dst);
1744 return &xdst->flo;
1745
1746 inc_error:
1747 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1748 error:
1749 if (xdst != NULL)
1750 dst_free(&xdst->u.dst);
1751 else
1752 xfrm_pols_put(pols, num_pols);
1753 return ERR_PTR(err);
1754 }
1755
1756 static struct dst_entry *make_blackhole(struct net *net, u16 family,
1757 struct dst_entry *dst_orig)
1758 {
1759 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1760 struct dst_entry *ret;
1761
1762 if (!afinfo) {
1763 dst_release(dst_orig);
1764 ret = ERR_PTR(-EINVAL);
1765 } else {
1766 ret = afinfo->blackhole_route(net, dst_orig);
1767 }
1768 xfrm_policy_put_afinfo(afinfo);
1769
1770 return ret;
1771 }
1772
1773 /* Main function: finds/creates a bundle for given flow.
1774 *
1775 * At the moment we eat a raw IP route. Mostly to speed up lookups
1776 * on interfaces with disabled IPsec.
1777 */
1778 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
1779 const struct flowi *fl,
1780 struct sock *sk, int flags)
1781 {
1782 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1783 struct flow_cache_object *flo;
1784 struct xfrm_dst *xdst;
1785 struct dst_entry *dst, *route;
1786 u16 family = dst_orig->ops->family;
1787 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1788 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1789
1790 restart:
1791 dst = NULL;
1792 xdst = NULL;
1793 route = NULL;
1794
1795 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1796 num_pols = 1;
1797 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1798 err = xfrm_expand_policies(fl, family, pols,
1799 &num_pols, &num_xfrms);
1800 if (err < 0)
1801 goto dropdst;
1802
1803 if (num_pols) {
1804 if (num_xfrms <= 0) {
1805 drop_pols = num_pols;
1806 goto no_transform;
1807 }
1808
1809 xdst = xfrm_resolve_and_create_bundle(
1810 pols, num_pols, fl,
1811 family, dst_orig);
1812 if (IS_ERR(xdst)) {
1813 xfrm_pols_put(pols, num_pols);
1814 err = PTR_ERR(xdst);
1815 goto dropdst;
1816 } else if (xdst == NULL) {
1817 num_xfrms = 0;
1818 drop_pols = num_pols;
1819 goto no_transform;
1820 }
1821
1822 dst_hold(&xdst->u.dst);
1823
1824 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1825 xdst->u.dst.next = xfrm_policy_sk_bundles;
1826 xfrm_policy_sk_bundles = &xdst->u.dst;
1827 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1828
1829 route = xdst->route;
1830 }
1831 }
1832
1833 if (xdst == NULL) {
1834 /* To accelerate a bit... */
1835 if ((dst_orig->flags & DST_NOXFRM) ||
1836 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1837 goto nopol;
1838
1839 flo = flow_cache_lookup(net, fl, family, dir,
1840 xfrm_bundle_lookup, dst_orig);
1841 if (flo == NULL)
1842 goto nopol;
1843 if (IS_ERR(flo)) {
1844 err = PTR_ERR(flo);
1845 goto dropdst;
1846 }
1847 xdst = container_of(flo, struct xfrm_dst, flo);
1848
1849 num_pols = xdst->num_pols;
1850 num_xfrms = xdst->num_xfrms;
1851 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1852 route = xdst->route;
1853 }
1854
1855 dst = &xdst->u.dst;
1856 if (route == NULL && num_xfrms > 0) {
1857 /* The only case when xfrm_bundle_lookup() returns a
1858 * bundle with null route, is when the template could
1859 * not be resolved. It means policies are there, but
1860 * bundle could not be created, since we don't yet
1861 * have the xfrm_state's. We need to wait for KM to
1862 * negotiate new SA's or bail out with error.*/
1863 if (net->xfrm.sysctl_larval_drop) {
1864 /* EREMOTE tells the caller to generate
1865 * a one-shot blackhole route. */
1866 dst_release(dst);
1867 xfrm_pols_put(pols, drop_pols);
1868 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1869
1870 return make_blackhole(net, family, dst_orig);
1871 }
1872 if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) {
1873 DECLARE_WAITQUEUE(wait, current);
1874
1875 add_wait_queue(&net->xfrm.km_waitq, &wait);
1876 set_current_state(TASK_INTERRUPTIBLE);
1877 schedule();
1878 set_current_state(TASK_RUNNING);
1879 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1880
1881 if (!signal_pending(current)) {
1882 dst_release(dst);
1883 goto restart;
1884 }
1885
1886 err = -ERESTART;
1887 } else
1888 err = -EAGAIN;
1889
1890 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1891 goto error;
1892 }
1893
1894 no_transform:
1895 if (num_pols == 0)
1896 goto nopol;
1897
1898 if ((flags & XFRM_LOOKUP_ICMP) &&
1899 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1900 err = -ENOENT;
1901 goto error;
1902 }
1903
1904 for (i = 0; i < num_pols; i++)
1905 pols[i]->curlft.use_time = get_seconds();
1906
1907 if (num_xfrms < 0) {
1908 /* Prohibit the flow */
1909 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1910 err = -EPERM;
1911 goto error;
1912 } else if (num_xfrms > 0) {
1913 /* Flow transformed */
1914 dst_release(dst_orig);
1915 } else {
1916 /* Flow passes untransformed */
1917 dst_release(dst);
1918 dst = dst_orig;
1919 }
1920 ok:
1921 xfrm_pols_put(pols, drop_pols);
1922 return dst;
1923
1924 nopol:
1925 if (!(flags & XFRM_LOOKUP_ICMP)) {
1926 dst = dst_orig;
1927 goto ok;
1928 }
1929 err = -ENOENT;
1930 error:
1931 dst_release(dst);
1932 dropdst:
1933 dst_release(dst_orig);
1934 xfrm_pols_put(pols, drop_pols);
1935 return ERR_PTR(err);
1936 }
1937 EXPORT_SYMBOL(xfrm_lookup);
1938
1939 static inline int
1940 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
1941 {
1942 struct xfrm_state *x;
1943
1944 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1945 return 0;
1946 x = skb->sp->xvec[idx];
1947 if (!x->type->reject)
1948 return 0;
1949 return x->type->reject(x, skb, fl);
1950 }
1951
1952 /* When skb is transformed back to its "native" form, we have to
1953 * check policy restrictions. At the moment we make this in maximally
1954 * stupid way. Shame on me. :-) Of course, connected sockets must
1955 * have policy cached at them.
1956 */
1957
1958 static inline int
1959 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1960 unsigned short family)
1961 {
1962 if (xfrm_state_kern(x))
1963 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1964 return x->id.proto == tmpl->id.proto &&
1965 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1966 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1967 x->props.mode == tmpl->mode &&
1968 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1969 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1970 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1971 xfrm_state_addr_cmp(tmpl, x, family));
1972 }
1973
1974 /*
1975 * 0 or more than 0 is returned when validation is succeeded (either bypass
1976 * because of optional transport mode, or next index of the mathced secpath
1977 * state with the template.
1978 * -1 is returned when no matching template is found.
1979 * Otherwise "-2 - errored_index" is returned.
1980 */
1981 static inline int
1982 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1983 unsigned short family)
1984 {
1985 int idx = start;
1986
1987 if (tmpl->optional) {
1988 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1989 return start;
1990 } else
1991 start = -1;
1992 for (; idx < sp->len; idx++) {
1993 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1994 return ++idx;
1995 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1996 if (start == -1)
1997 start = -2-idx;
1998 break;
1999 }
2000 }
2001 return start;
2002 }
2003
2004 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2005 unsigned int family, int reverse)
2006 {
2007 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2008 int err;
2009
2010 if (unlikely(afinfo == NULL))
2011 return -EAFNOSUPPORT;
2012
2013 afinfo->decode_session(skb, fl, reverse);
2014 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2015 xfrm_policy_put_afinfo(afinfo);
2016 return err;
2017 }
2018 EXPORT_SYMBOL(__xfrm_decode_session);
2019
2020 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2021 {
2022 for (; k < sp->len; k++) {
2023 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2024 *idxp = k;
2025 return 1;
2026 }
2027 }
2028
2029 return 0;
2030 }
2031
2032 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2033 unsigned short family)
2034 {
2035 struct net *net = dev_net(skb->dev);
2036 struct xfrm_policy *pol;
2037 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2038 int npols = 0;
2039 int xfrm_nr;
2040 int pi;
2041 int reverse;
2042 struct flowi fl;
2043 u8 fl_dir;
2044 int xerr_idx = -1;
2045
2046 reverse = dir & ~XFRM_POLICY_MASK;
2047 dir &= XFRM_POLICY_MASK;
2048 fl_dir = policy_to_flow_dir(dir);
2049
2050 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2051 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2052 return 0;
2053 }
2054
2055 nf_nat_decode_session(skb, &fl, family);
2056
2057 /* First, check used SA against their selectors. */
2058 if (skb->sp) {
2059 int i;
2060
2061 for (i=skb->sp->len-1; i>=0; i--) {
2062 struct xfrm_state *x = skb->sp->xvec[i];
2063 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2064 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2065 return 0;
2066 }
2067 }
2068 }
2069
2070 pol = NULL;
2071 if (sk && sk->sk_policy[dir]) {
2072 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2073 if (IS_ERR(pol)) {
2074 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2075 return 0;
2076 }
2077 }
2078
2079 if (!pol) {
2080 struct flow_cache_object *flo;
2081
2082 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2083 xfrm_policy_lookup, NULL);
2084 if (IS_ERR_OR_NULL(flo))
2085 pol = ERR_CAST(flo);
2086 else
2087 pol = container_of(flo, struct xfrm_policy, flo);
2088 }
2089
2090 if (IS_ERR(pol)) {
2091 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2092 return 0;
2093 }
2094
2095 if (!pol) {
2096 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2097 xfrm_secpath_reject(xerr_idx, skb, &fl);
2098 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2099 return 0;
2100 }
2101 return 1;
2102 }
2103
2104 pol->curlft.use_time = get_seconds();
2105
2106 pols[0] = pol;
2107 npols ++;
2108 #ifdef CONFIG_XFRM_SUB_POLICY
2109 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2110 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2111 &fl, family,
2112 XFRM_POLICY_IN);
2113 if (pols[1]) {
2114 if (IS_ERR(pols[1])) {
2115 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2116 return 0;
2117 }
2118 pols[1]->curlft.use_time = get_seconds();
2119 npols ++;
2120 }
2121 }
2122 #endif
2123
2124 if (pol->action == XFRM_POLICY_ALLOW) {
2125 struct sec_path *sp;
2126 static struct sec_path dummy;
2127 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2128 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2129 struct xfrm_tmpl **tpp = tp;
2130 int ti = 0;
2131 int i, k;
2132
2133 if ((sp = skb->sp) == NULL)
2134 sp = &dummy;
2135
2136 for (pi = 0; pi < npols; pi++) {
2137 if (pols[pi] != pol &&
2138 pols[pi]->action != XFRM_POLICY_ALLOW) {
2139 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2140 goto reject;
2141 }
2142 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2143 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2144 goto reject_error;
2145 }
2146 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2147 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2148 }
2149 xfrm_nr = ti;
2150 if (npols > 1) {
2151 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2152 tpp = stp;
2153 }
2154
2155 /* For each tunnel xfrm, find the first matching tmpl.
2156 * For each tmpl before that, find corresponding xfrm.
2157 * Order is _important_. Later we will implement
2158 * some barriers, but at the moment barriers
2159 * are implied between each two transformations.
2160 */
2161 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2162 k = xfrm_policy_ok(tpp[i], sp, k, family);
2163 if (k < 0) {
2164 if (k < -1)
2165 /* "-2 - errored_index" returned */
2166 xerr_idx = -(2+k);
2167 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2168 goto reject;
2169 }
2170 }
2171
2172 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2173 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2174 goto reject;
2175 }
2176
2177 xfrm_pols_put(pols, npols);
2178 return 1;
2179 }
2180 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2181
2182 reject:
2183 xfrm_secpath_reject(xerr_idx, skb, &fl);
2184 reject_error:
2185 xfrm_pols_put(pols, npols);
2186 return 0;
2187 }
2188 EXPORT_SYMBOL(__xfrm_policy_check);
2189
2190 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2191 {
2192 struct net *net = dev_net(skb->dev);
2193 struct flowi fl;
2194 struct dst_entry *dst;
2195 int res = 1;
2196
2197 if (xfrm_decode_session(skb, &fl, family) < 0) {
2198 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2199 return 0;
2200 }
2201
2202 skb_dst_force(skb);
2203
2204 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2205 if (IS_ERR(dst)) {
2206 res = 0;
2207 dst = NULL;
2208 }
2209 skb_dst_set(skb, dst);
2210 return res;
2211 }
2212 EXPORT_SYMBOL(__xfrm_route_forward);
2213
2214 /* Optimize later using cookies and generation ids. */
2215
2216 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2217 {
2218 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2219 * to "-1" to force all XFRM destinations to get validated by
2220 * dst_ops->check on every use. We do this because when a
2221 * normal route referenced by an XFRM dst is obsoleted we do
2222 * not go looking around for all parent referencing XFRM dsts
2223 * so that we can invalidate them. It is just too much work.
2224 * Instead we make the checks here on every use. For example:
2225 *
2226 * XFRM dst A --> IPv4 dst X
2227 *
2228 * X is the "xdst->route" of A (X is also the "dst->path" of A
2229 * in this example). If X is marked obsolete, "A" will not
2230 * notice. That's what we are validating here via the
2231 * stale_bundle() check.
2232 *
2233 * When a policy's bundle is pruned, we dst_free() the XFRM
2234 * dst which causes it's ->obsolete field to be set to a
2235 * positive non-zero integer. If an XFRM dst has been pruned
2236 * like this, we want to force a new route lookup.
2237 */
2238 if (dst->obsolete < 0 && !stale_bundle(dst))
2239 return dst;
2240
2241 return NULL;
2242 }
2243
2244 static int stale_bundle(struct dst_entry *dst)
2245 {
2246 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2247 }
2248
2249 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2250 {
2251 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2252 dst->dev = dev_net(dev)->loopback_dev;
2253 dev_hold(dst->dev);
2254 dev_put(dev);
2255 }
2256 }
2257 EXPORT_SYMBOL(xfrm_dst_ifdown);
2258
2259 static void xfrm_link_failure(struct sk_buff *skb)
2260 {
2261 /* Impossible. Such dst must be popped before reaches point of failure. */
2262 }
2263
2264 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2265 {
2266 if (dst) {
2267 if (dst->obsolete) {
2268 dst_release(dst);
2269 dst = NULL;
2270 }
2271 }
2272 return dst;
2273 }
2274
2275 static void __xfrm_garbage_collect(struct net *net)
2276 {
2277 struct dst_entry *head, *next;
2278
2279 flow_cache_flush();
2280
2281 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2282 head = xfrm_policy_sk_bundles;
2283 xfrm_policy_sk_bundles = NULL;
2284 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2285
2286 while (head) {
2287 next = head->next;
2288 dst_free(head);
2289 head = next;
2290 }
2291 }
2292
2293 static void xfrm_init_pmtu(struct dst_entry *dst)
2294 {
2295 do {
2296 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2297 u32 pmtu, route_mtu_cached;
2298
2299 pmtu = dst_mtu(dst->child);
2300 xdst->child_mtu_cached = pmtu;
2301
2302 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2303
2304 route_mtu_cached = dst_mtu(xdst->route);
2305 xdst->route_mtu_cached = route_mtu_cached;
2306
2307 if (pmtu > route_mtu_cached)
2308 pmtu = route_mtu_cached;
2309
2310 dst_metric_set(dst, RTAX_MTU, pmtu);
2311 } while ((dst = dst->next));
2312 }
2313
2314 /* Check that the bundle accepts the flow and its components are
2315 * still valid.
2316 */
2317
2318 static int xfrm_bundle_ok(struct xfrm_dst *first)
2319 {
2320 struct dst_entry *dst = &first->u.dst;
2321 struct xfrm_dst *last;
2322 u32 mtu;
2323
2324 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2325 (dst->dev && !netif_running(dst->dev)))
2326 return 0;
2327
2328 last = NULL;
2329
2330 do {
2331 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2332
2333 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2334 return 0;
2335 if (xdst->xfrm_genid != dst->xfrm->genid)
2336 return 0;
2337 if (xdst->num_pols > 0 &&
2338 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2339 return 0;
2340
2341 mtu = dst_mtu(dst->child);
2342 if (xdst->child_mtu_cached != mtu) {
2343 last = xdst;
2344 xdst->child_mtu_cached = mtu;
2345 }
2346
2347 if (!dst_check(xdst->route, xdst->route_cookie))
2348 return 0;
2349 mtu = dst_mtu(xdst->route);
2350 if (xdst->route_mtu_cached != mtu) {
2351 last = xdst;
2352 xdst->route_mtu_cached = mtu;
2353 }
2354
2355 dst = dst->child;
2356 } while (dst->xfrm);
2357
2358 if (likely(!last))
2359 return 1;
2360
2361 mtu = last->child_mtu_cached;
2362 for (;;) {
2363 dst = &last->u.dst;
2364
2365 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2366 if (mtu > last->route_mtu_cached)
2367 mtu = last->route_mtu_cached;
2368 dst_metric_set(dst, RTAX_MTU, mtu);
2369
2370 if (last == first)
2371 break;
2372
2373 last = (struct xfrm_dst *)last->u.dst.next;
2374 last->child_mtu_cached = mtu;
2375 }
2376
2377 return 1;
2378 }
2379
2380 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2381 {
2382 return dst_metric_advmss(dst->path);
2383 }
2384
2385 static unsigned int xfrm_default_mtu(const struct dst_entry *dst)
2386 {
2387 return dst_mtu(dst->path);
2388 }
2389
2390 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, const void *daddr)
2391 {
2392 return dst_neigh_lookup(dst->path, daddr);
2393 }
2394
2395 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2396 {
2397 struct net *net;
2398 int err = 0;
2399 if (unlikely(afinfo == NULL))
2400 return -EINVAL;
2401 if (unlikely(afinfo->family >= NPROTO))
2402 return -EAFNOSUPPORT;
2403 write_lock_bh(&xfrm_policy_afinfo_lock);
2404 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2405 err = -ENOBUFS;
2406 else {
2407 struct dst_ops *dst_ops = afinfo->dst_ops;
2408 if (likely(dst_ops->kmem_cachep == NULL))
2409 dst_ops->kmem_cachep = xfrm_dst_cache;
2410 if (likely(dst_ops->check == NULL))
2411 dst_ops->check = xfrm_dst_check;
2412 if (likely(dst_ops->default_advmss == NULL))
2413 dst_ops->default_advmss = xfrm_default_advmss;
2414 if (likely(dst_ops->default_mtu == NULL))
2415 dst_ops->default_mtu = xfrm_default_mtu;
2416 if (likely(dst_ops->negative_advice == NULL))
2417 dst_ops->negative_advice = xfrm_negative_advice;
2418 if (likely(dst_ops->link_failure == NULL))
2419 dst_ops->link_failure = xfrm_link_failure;
2420 if (likely(dst_ops->neigh_lookup == NULL))
2421 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2422 if (likely(afinfo->garbage_collect == NULL))
2423 afinfo->garbage_collect = __xfrm_garbage_collect;
2424 xfrm_policy_afinfo[afinfo->family] = afinfo;
2425 }
2426 write_unlock_bh(&xfrm_policy_afinfo_lock);
2427
2428 rtnl_lock();
2429 for_each_net(net) {
2430 struct dst_ops *xfrm_dst_ops;
2431
2432 switch (afinfo->family) {
2433 case AF_INET:
2434 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2435 break;
2436 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2437 case AF_INET6:
2438 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2439 break;
2440 #endif
2441 default:
2442 BUG();
2443 }
2444 *xfrm_dst_ops = *afinfo->dst_ops;
2445 }
2446 rtnl_unlock();
2447
2448 return err;
2449 }
2450 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2451
2452 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2453 {
2454 int err = 0;
2455 if (unlikely(afinfo == NULL))
2456 return -EINVAL;
2457 if (unlikely(afinfo->family >= NPROTO))
2458 return -EAFNOSUPPORT;
2459 write_lock_bh(&xfrm_policy_afinfo_lock);
2460 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2461 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2462 err = -EINVAL;
2463 else {
2464 struct dst_ops *dst_ops = afinfo->dst_ops;
2465 xfrm_policy_afinfo[afinfo->family] = NULL;
2466 dst_ops->kmem_cachep = NULL;
2467 dst_ops->check = NULL;
2468 dst_ops->negative_advice = NULL;
2469 dst_ops->link_failure = NULL;
2470 afinfo->garbage_collect = NULL;
2471 }
2472 }
2473 write_unlock_bh(&xfrm_policy_afinfo_lock);
2474 return err;
2475 }
2476 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2477
2478 static void __net_init xfrm_dst_ops_init(struct net *net)
2479 {
2480 struct xfrm_policy_afinfo *afinfo;
2481
2482 read_lock_bh(&xfrm_policy_afinfo_lock);
2483 afinfo = xfrm_policy_afinfo[AF_INET];
2484 if (afinfo)
2485 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2486 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2487 afinfo = xfrm_policy_afinfo[AF_INET6];
2488 if (afinfo)
2489 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2490 #endif
2491 read_unlock_bh(&xfrm_policy_afinfo_lock);
2492 }
2493
2494 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2495 {
2496 struct xfrm_policy_afinfo *afinfo;
2497 if (unlikely(family >= NPROTO))
2498 return NULL;
2499 read_lock(&xfrm_policy_afinfo_lock);
2500 afinfo = xfrm_policy_afinfo[family];
2501 if (unlikely(!afinfo))
2502 read_unlock(&xfrm_policy_afinfo_lock);
2503 return afinfo;
2504 }
2505
2506 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2507 {
2508 read_unlock(&xfrm_policy_afinfo_lock);
2509 }
2510
2511 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2512 {
2513 struct net_device *dev = ptr;
2514
2515 switch (event) {
2516 case NETDEV_DOWN:
2517 __xfrm_garbage_collect(dev_net(dev));
2518 }
2519 return NOTIFY_DONE;
2520 }
2521
2522 static struct notifier_block xfrm_dev_notifier = {
2523 .notifier_call = xfrm_dev_event,
2524 };
2525
2526 #ifdef CONFIG_XFRM_STATISTICS
2527 static int __net_init xfrm_statistics_init(struct net *net)
2528 {
2529 int rv;
2530
2531 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2532 sizeof(struct linux_xfrm_mib),
2533 __alignof__(struct linux_xfrm_mib)) < 0)
2534 return -ENOMEM;
2535 rv = xfrm_proc_init(net);
2536 if (rv < 0)
2537 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2538 return rv;
2539 }
2540
2541 static void xfrm_statistics_fini(struct net *net)
2542 {
2543 xfrm_proc_fini(net);
2544 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2545 }
2546 #else
2547 static int __net_init xfrm_statistics_init(struct net *net)
2548 {
2549 return 0;
2550 }
2551
2552 static void xfrm_statistics_fini(struct net *net)
2553 {
2554 }
2555 #endif
2556
2557 static int __net_init xfrm_policy_init(struct net *net)
2558 {
2559 unsigned int hmask, sz;
2560 int dir;
2561
2562 if (net_eq(net, &init_net))
2563 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2564 sizeof(struct xfrm_dst),
2565 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2566 NULL);
2567
2568 hmask = 8 - 1;
2569 sz = (hmask+1) * sizeof(struct hlist_head);
2570
2571 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2572 if (!net->xfrm.policy_byidx)
2573 goto out_byidx;
2574 net->xfrm.policy_idx_hmask = hmask;
2575
2576 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2577 struct xfrm_policy_hash *htab;
2578
2579 net->xfrm.policy_count[dir] = 0;
2580 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2581
2582 htab = &net->xfrm.policy_bydst[dir];
2583 htab->table = xfrm_hash_alloc(sz);
2584 if (!htab->table)
2585 goto out_bydst;
2586 htab->hmask = hmask;
2587 }
2588
2589 INIT_LIST_HEAD(&net->xfrm.policy_all);
2590 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2591 if (net_eq(net, &init_net))
2592 register_netdevice_notifier(&xfrm_dev_notifier);
2593 return 0;
2594
2595 out_bydst:
2596 for (dir--; dir >= 0; dir--) {
2597 struct xfrm_policy_hash *htab;
2598
2599 htab = &net->xfrm.policy_bydst[dir];
2600 xfrm_hash_free(htab->table, sz);
2601 }
2602 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2603 out_byidx:
2604 return -ENOMEM;
2605 }
2606
2607 static void xfrm_policy_fini(struct net *net)
2608 {
2609 struct xfrm_audit audit_info;
2610 unsigned int sz;
2611 int dir;
2612
2613 flush_work(&net->xfrm.policy_hash_work);
2614 #ifdef CONFIG_XFRM_SUB_POLICY
2615 audit_info.loginuid = -1;
2616 audit_info.sessionid = -1;
2617 audit_info.secid = 0;
2618 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2619 #endif
2620 audit_info.loginuid = -1;
2621 audit_info.sessionid = -1;
2622 audit_info.secid = 0;
2623 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2624
2625 WARN_ON(!list_empty(&net->xfrm.policy_all));
2626
2627 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2628 struct xfrm_policy_hash *htab;
2629
2630 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2631
2632 htab = &net->xfrm.policy_bydst[dir];
2633 sz = (htab->hmask + 1);
2634 WARN_ON(!hlist_empty(htab->table));
2635 xfrm_hash_free(htab->table, sz);
2636 }
2637
2638 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2639 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2640 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2641 }
2642
2643 static int __net_init xfrm_net_init(struct net *net)
2644 {
2645 int rv;
2646
2647 rv = xfrm_statistics_init(net);
2648 if (rv < 0)
2649 goto out_statistics;
2650 rv = xfrm_state_init(net);
2651 if (rv < 0)
2652 goto out_state;
2653 rv = xfrm_policy_init(net);
2654 if (rv < 0)
2655 goto out_policy;
2656 xfrm_dst_ops_init(net);
2657 rv = xfrm_sysctl_init(net);
2658 if (rv < 0)
2659 goto out_sysctl;
2660 return 0;
2661
2662 out_sysctl:
2663 xfrm_policy_fini(net);
2664 out_policy:
2665 xfrm_state_fini(net);
2666 out_state:
2667 xfrm_statistics_fini(net);
2668 out_statistics:
2669 return rv;
2670 }
2671
2672 static void __net_exit xfrm_net_exit(struct net *net)
2673 {
2674 xfrm_sysctl_fini(net);
2675 xfrm_policy_fini(net);
2676 xfrm_state_fini(net);
2677 xfrm_statistics_fini(net);
2678 }
2679
2680 static struct pernet_operations __net_initdata xfrm_net_ops = {
2681 .init = xfrm_net_init,
2682 .exit = xfrm_net_exit,
2683 };
2684
2685 void __init xfrm_init(void)
2686 {
2687 register_pernet_subsys(&xfrm_net_ops);
2688 xfrm_input_init();
2689 }
2690
2691 #ifdef CONFIG_AUDITSYSCALL
2692 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2693 struct audit_buffer *audit_buf)
2694 {
2695 struct xfrm_sec_ctx *ctx = xp->security;
2696 struct xfrm_selector *sel = &xp->selector;
2697
2698 if (ctx)
2699 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2700 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2701
2702 switch(sel->family) {
2703 case AF_INET:
2704 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2705 if (sel->prefixlen_s != 32)
2706 audit_log_format(audit_buf, " src_prefixlen=%d",
2707 sel->prefixlen_s);
2708 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2709 if (sel->prefixlen_d != 32)
2710 audit_log_format(audit_buf, " dst_prefixlen=%d",
2711 sel->prefixlen_d);
2712 break;
2713 case AF_INET6:
2714 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2715 if (sel->prefixlen_s != 128)
2716 audit_log_format(audit_buf, " src_prefixlen=%d",
2717 sel->prefixlen_s);
2718 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2719 if (sel->prefixlen_d != 128)
2720 audit_log_format(audit_buf, " dst_prefixlen=%d",
2721 sel->prefixlen_d);
2722 break;
2723 }
2724 }
2725
2726 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2727 uid_t auid, u32 sessionid, u32 secid)
2728 {
2729 struct audit_buffer *audit_buf;
2730
2731 audit_buf = xfrm_audit_start("SPD-add");
2732 if (audit_buf == NULL)
2733 return;
2734 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2735 audit_log_format(audit_buf, " res=%u", result);
2736 xfrm_audit_common_policyinfo(xp, audit_buf);
2737 audit_log_end(audit_buf);
2738 }
2739 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2740
2741 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2742 uid_t auid, u32 sessionid, u32 secid)
2743 {
2744 struct audit_buffer *audit_buf;
2745
2746 audit_buf = xfrm_audit_start("SPD-delete");
2747 if (audit_buf == NULL)
2748 return;
2749 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2750 audit_log_format(audit_buf, " res=%u", result);
2751 xfrm_audit_common_policyinfo(xp, audit_buf);
2752 audit_log_end(audit_buf);
2753 }
2754 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2755 #endif
2756
2757 #ifdef CONFIG_XFRM_MIGRATE
2758 static int xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
2759 const struct xfrm_selector *sel_tgt)
2760 {
2761 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2762 if (sel_tgt->family == sel_cmp->family &&
2763 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2764 sel_cmp->family) == 0 &&
2765 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2766 sel_cmp->family) == 0 &&
2767 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2768 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2769 return 1;
2770 }
2771 } else {
2772 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2773 return 1;
2774 }
2775 }
2776 return 0;
2777 }
2778
2779 static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel,
2780 u8 dir, u8 type)
2781 {
2782 struct xfrm_policy *pol, *ret = NULL;
2783 struct hlist_node *entry;
2784 struct hlist_head *chain;
2785 u32 priority = ~0U;
2786
2787 read_lock_bh(&xfrm_policy_lock);
2788 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2789 hlist_for_each_entry(pol, entry, chain, bydst) {
2790 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2791 pol->type == type) {
2792 ret = pol;
2793 priority = ret->priority;
2794 break;
2795 }
2796 }
2797 chain = &init_net.xfrm.policy_inexact[dir];
2798 hlist_for_each_entry(pol, entry, chain, bydst) {
2799 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2800 pol->type == type &&
2801 pol->priority < priority) {
2802 ret = pol;
2803 break;
2804 }
2805 }
2806
2807 if (ret)
2808 xfrm_pol_hold(ret);
2809
2810 read_unlock_bh(&xfrm_policy_lock);
2811
2812 return ret;
2813 }
2814
2815 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
2816 {
2817 int match = 0;
2818
2819 if (t->mode == m->mode && t->id.proto == m->proto &&
2820 (m->reqid == 0 || t->reqid == m->reqid)) {
2821 switch (t->mode) {
2822 case XFRM_MODE_TUNNEL:
2823 case XFRM_MODE_BEET:
2824 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2825 m->old_family) == 0 &&
2826 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2827 m->old_family) == 0) {
2828 match = 1;
2829 }
2830 break;
2831 case XFRM_MODE_TRANSPORT:
2832 /* in case of transport mode, template does not store
2833 any IP addresses, hence we just compare mode and
2834 protocol */
2835 match = 1;
2836 break;
2837 default:
2838 break;
2839 }
2840 }
2841 return match;
2842 }
2843
2844 /* update endpoint address(es) of template(s) */
2845 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2846 struct xfrm_migrate *m, int num_migrate)
2847 {
2848 struct xfrm_migrate *mp;
2849 int i, j, n = 0;
2850
2851 write_lock_bh(&pol->lock);
2852 if (unlikely(pol->walk.dead)) {
2853 /* target policy has been deleted */
2854 write_unlock_bh(&pol->lock);
2855 return -ENOENT;
2856 }
2857
2858 for (i = 0; i < pol->xfrm_nr; i++) {
2859 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2860 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2861 continue;
2862 n++;
2863 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2864 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2865 continue;
2866 /* update endpoints */
2867 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2868 sizeof(pol->xfrm_vec[i].id.daddr));
2869 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2870 sizeof(pol->xfrm_vec[i].saddr));
2871 pol->xfrm_vec[i].encap_family = mp->new_family;
2872 /* flush bundles */
2873 atomic_inc(&pol->genid);
2874 }
2875 }
2876
2877 write_unlock_bh(&pol->lock);
2878
2879 if (!n)
2880 return -ENODATA;
2881
2882 return 0;
2883 }
2884
2885 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
2886 {
2887 int i, j;
2888
2889 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2890 return -EINVAL;
2891
2892 for (i = 0; i < num_migrate; i++) {
2893 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2894 m[i].old_family) == 0) &&
2895 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2896 m[i].old_family) == 0))
2897 return -EINVAL;
2898 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2899 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2900 return -EINVAL;
2901
2902 /* check if there is any duplicated entry */
2903 for (j = i + 1; j < num_migrate; j++) {
2904 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2905 sizeof(m[i].old_daddr)) &&
2906 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2907 sizeof(m[i].old_saddr)) &&
2908 m[i].proto == m[j].proto &&
2909 m[i].mode == m[j].mode &&
2910 m[i].reqid == m[j].reqid &&
2911 m[i].old_family == m[j].old_family)
2912 return -EINVAL;
2913 }
2914 }
2915
2916 return 0;
2917 }
2918
2919 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2920 struct xfrm_migrate *m, int num_migrate,
2921 struct xfrm_kmaddress *k)
2922 {
2923 int i, err, nx_cur = 0, nx_new = 0;
2924 struct xfrm_policy *pol = NULL;
2925 struct xfrm_state *x, *xc;
2926 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2927 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2928 struct xfrm_migrate *mp;
2929
2930 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2931 goto out;
2932
2933 /* Stage 1 - find policy */
2934 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2935 err = -ENOENT;
2936 goto out;
2937 }
2938
2939 /* Stage 2 - find and update state(s) */
2940 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2941 if ((x = xfrm_migrate_state_find(mp))) {
2942 x_cur[nx_cur] = x;
2943 nx_cur++;
2944 if ((xc = xfrm_state_migrate(x, mp))) {
2945 x_new[nx_new] = xc;
2946 nx_new++;
2947 } else {
2948 err = -ENODATA;
2949 goto restore_state;
2950 }
2951 }
2952 }
2953
2954 /* Stage 3 - update policy */
2955 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2956 goto restore_state;
2957
2958 /* Stage 4 - delete old state(s) */
2959 if (nx_cur) {
2960 xfrm_states_put(x_cur, nx_cur);
2961 xfrm_states_delete(x_cur, nx_cur);
2962 }
2963
2964 /* Stage 5 - announce */
2965 km_migrate(sel, dir, type, m, num_migrate, k);
2966
2967 xfrm_pol_put(pol);
2968
2969 return 0;
2970 out:
2971 return err;
2972
2973 restore_state:
2974 if (pol)
2975 xfrm_pol_put(pol);
2976 if (nx_cur)
2977 xfrm_states_put(x_cur, nx_cur);
2978 if (nx_new)
2979 xfrm_states_delete(x_new, nx_new);
2980
2981 return err;
2982 }
2983 EXPORT_SYMBOL(xfrm_migrate);
2984 #endif
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