NFS: Prevent memory allocation failure in nfsacl_encode()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / xfrm / xfrm_policy.c
blob8b3ef404c79441bb47e4b15225bf7eb39c0d9501
1 /*
2 * xfrm_policy.c
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
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
35 #include "xfrm_hash.h"
37 DEFINE_MUTEX(xfrm_cfg_mutex);
38 EXPORT_SYMBOL(xfrm_cfg_mutex);
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);
44 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
45 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
47 static struct kmem_cache *xfrm_dst_cache __read_mostly;
49 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
50 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
51 static void xfrm_init_pmtu(struct dst_entry *dst);
52 static int stale_bundle(struct dst_entry *dst);
53 static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
54 struct flowi *fl, int family, int strict);
57 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
58 int dir);
60 static inline int
61 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
63 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
64 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
65 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
66 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
67 (fl->proto == sel->proto || !sel->proto) &&
68 (fl->oif == sel->ifindex || !sel->ifindex);
71 static inline int
72 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
74 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
75 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
76 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
77 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
78 (fl->proto == sel->proto || !sel->proto) &&
79 (fl->oif == sel->ifindex || !sel->ifindex);
82 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
83 unsigned short family)
85 switch (family) {
86 case AF_INET:
87 return __xfrm4_selector_match(sel, fl);
88 case AF_INET6:
89 return __xfrm6_selector_match(sel, fl);
91 return 0;
94 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
95 xfrm_address_t *saddr,
96 xfrm_address_t *daddr,
97 int family)
99 struct xfrm_policy_afinfo *afinfo;
100 struct dst_entry *dst;
102 afinfo = xfrm_policy_get_afinfo(family);
103 if (unlikely(afinfo == NULL))
104 return ERR_PTR(-EAFNOSUPPORT);
106 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
108 xfrm_policy_put_afinfo(afinfo);
110 return dst;
113 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
114 xfrm_address_t *prev_saddr,
115 xfrm_address_t *prev_daddr,
116 int family)
118 struct net *net = xs_net(x);
119 xfrm_address_t *saddr = &x->props.saddr;
120 xfrm_address_t *daddr = &x->id.daddr;
121 struct dst_entry *dst;
123 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
124 saddr = x->coaddr;
125 daddr = prev_daddr;
127 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
128 saddr = prev_saddr;
129 daddr = x->coaddr;
132 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
134 if (!IS_ERR(dst)) {
135 if (prev_saddr != saddr)
136 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
137 if (prev_daddr != daddr)
138 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
141 return dst;
144 static inline unsigned long make_jiffies(long secs)
146 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
147 return MAX_SCHEDULE_TIMEOUT-1;
148 else
149 return secs*HZ;
152 static void xfrm_policy_timer(unsigned long data)
154 struct xfrm_policy *xp = (struct xfrm_policy*)data;
155 unsigned long now = get_seconds();
156 long next = LONG_MAX;
157 int warn = 0;
158 int dir;
160 read_lock(&xp->lock);
162 if (unlikely(xp->walk.dead))
163 goto out;
165 dir = xfrm_policy_id2dir(xp->index);
167 if (xp->lft.hard_add_expires_seconds) {
168 long tmo = xp->lft.hard_add_expires_seconds +
169 xp->curlft.add_time - now;
170 if (tmo <= 0)
171 goto expired;
172 if (tmo < next)
173 next = tmo;
175 if (xp->lft.hard_use_expires_seconds) {
176 long tmo = xp->lft.hard_use_expires_seconds +
177 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
178 if (tmo <= 0)
179 goto expired;
180 if (tmo < next)
181 next = tmo;
183 if (xp->lft.soft_add_expires_seconds) {
184 long tmo = xp->lft.soft_add_expires_seconds +
185 xp->curlft.add_time - now;
186 if (tmo <= 0) {
187 warn = 1;
188 tmo = XFRM_KM_TIMEOUT;
190 if (tmo < next)
191 next = tmo;
193 if (xp->lft.soft_use_expires_seconds) {
194 long tmo = xp->lft.soft_use_expires_seconds +
195 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
196 if (tmo <= 0) {
197 warn = 1;
198 tmo = XFRM_KM_TIMEOUT;
200 if (tmo < next)
201 next = tmo;
204 if (warn)
205 km_policy_expired(xp, dir, 0, 0);
206 if (next != LONG_MAX &&
207 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
208 xfrm_pol_hold(xp);
210 out:
211 read_unlock(&xp->lock);
212 xfrm_pol_put(xp);
213 return;
215 expired:
216 read_unlock(&xp->lock);
217 if (!xfrm_policy_delete(xp, dir))
218 km_policy_expired(xp, dir, 1, 0);
219 xfrm_pol_put(xp);
222 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
224 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
226 if (unlikely(pol->walk.dead))
227 flo = NULL;
228 else
229 xfrm_pol_hold(pol);
231 return flo;
234 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
236 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
238 return !pol->walk.dead;
241 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
243 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
246 static const struct flow_cache_ops xfrm_policy_fc_ops = {
247 .get = xfrm_policy_flo_get,
248 .check = xfrm_policy_flo_check,
249 .delete = xfrm_policy_flo_delete,
252 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
253 * SPD calls.
256 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
258 struct xfrm_policy *policy;
260 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
262 if (policy) {
263 write_pnet(&policy->xp_net, net);
264 INIT_LIST_HEAD(&policy->walk.all);
265 INIT_HLIST_NODE(&policy->bydst);
266 INIT_HLIST_NODE(&policy->byidx);
267 rwlock_init(&policy->lock);
268 atomic_set(&policy->refcnt, 1);
269 setup_timer(&policy->timer, xfrm_policy_timer,
270 (unsigned long)policy);
271 policy->flo.ops = &xfrm_policy_fc_ops;
273 return policy;
275 EXPORT_SYMBOL(xfrm_policy_alloc);
277 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
279 void xfrm_policy_destroy(struct xfrm_policy *policy)
281 BUG_ON(!policy->walk.dead);
283 if (del_timer(&policy->timer))
284 BUG();
286 security_xfrm_policy_free(policy->security);
287 kfree(policy);
289 EXPORT_SYMBOL(xfrm_policy_destroy);
291 /* Rule must be locked. Release descentant resources, announce
292 * entry dead. The rule must be unlinked from lists to the moment.
295 static void xfrm_policy_kill(struct xfrm_policy *policy)
297 policy->walk.dead = 1;
299 atomic_inc(&policy->genid);
301 if (del_timer(&policy->timer))
302 xfrm_pol_put(policy);
304 xfrm_pol_put(policy);
307 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
309 static inline unsigned int idx_hash(struct net *net, u32 index)
311 return __idx_hash(index, net->xfrm.policy_idx_hmask);
314 static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
316 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
317 unsigned int hash = __sel_hash(sel, family, hmask);
319 return (hash == hmask + 1 ?
320 &net->xfrm.policy_inexact[dir] :
321 net->xfrm.policy_bydst[dir].table + hash);
324 static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
326 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
327 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
329 return net->xfrm.policy_bydst[dir].table + hash;
332 static void xfrm_dst_hash_transfer(struct hlist_head *list,
333 struct hlist_head *ndsttable,
334 unsigned int nhashmask)
336 struct hlist_node *entry, *tmp, *entry0 = NULL;
337 struct xfrm_policy *pol;
338 unsigned int h0 = 0;
340 redo:
341 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
342 unsigned int h;
344 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
345 pol->family, nhashmask);
346 if (!entry0) {
347 hlist_del(entry);
348 hlist_add_head(&pol->bydst, ndsttable+h);
349 h0 = h;
350 } else {
351 if (h != h0)
352 continue;
353 hlist_del(entry);
354 hlist_add_after(entry0, &pol->bydst);
356 entry0 = entry;
358 if (!hlist_empty(list)) {
359 entry0 = NULL;
360 goto redo;
364 static void xfrm_idx_hash_transfer(struct hlist_head *list,
365 struct hlist_head *nidxtable,
366 unsigned int nhashmask)
368 struct hlist_node *entry, *tmp;
369 struct xfrm_policy *pol;
371 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
372 unsigned int h;
374 h = __idx_hash(pol->index, nhashmask);
375 hlist_add_head(&pol->byidx, nidxtable+h);
379 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
381 return ((old_hmask + 1) << 1) - 1;
384 static void xfrm_bydst_resize(struct net *net, int dir)
386 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
387 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
388 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
389 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
390 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
391 int i;
393 if (!ndst)
394 return;
396 write_lock_bh(&xfrm_policy_lock);
398 for (i = hmask; i >= 0; i--)
399 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
401 net->xfrm.policy_bydst[dir].table = ndst;
402 net->xfrm.policy_bydst[dir].hmask = nhashmask;
404 write_unlock_bh(&xfrm_policy_lock);
406 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
409 static void xfrm_byidx_resize(struct net *net, int total)
411 unsigned int hmask = net->xfrm.policy_idx_hmask;
412 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
413 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
414 struct hlist_head *oidx = net->xfrm.policy_byidx;
415 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
416 int i;
418 if (!nidx)
419 return;
421 write_lock_bh(&xfrm_policy_lock);
423 for (i = hmask; i >= 0; i--)
424 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
426 net->xfrm.policy_byidx = nidx;
427 net->xfrm.policy_idx_hmask = nhashmask;
429 write_unlock_bh(&xfrm_policy_lock);
431 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
434 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
436 unsigned int cnt = net->xfrm.policy_count[dir];
437 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
439 if (total)
440 *total += cnt;
442 if ((hmask + 1) < xfrm_policy_hashmax &&
443 cnt > hmask)
444 return 1;
446 return 0;
449 static inline int xfrm_byidx_should_resize(struct net *net, int total)
451 unsigned int hmask = net->xfrm.policy_idx_hmask;
453 if ((hmask + 1) < xfrm_policy_hashmax &&
454 total > hmask)
455 return 1;
457 return 0;
460 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
462 read_lock_bh(&xfrm_policy_lock);
463 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
464 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
465 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
466 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
467 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
468 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
469 si->spdhcnt = net->xfrm.policy_idx_hmask;
470 si->spdhmcnt = xfrm_policy_hashmax;
471 read_unlock_bh(&xfrm_policy_lock);
473 EXPORT_SYMBOL(xfrm_spd_getinfo);
475 static DEFINE_MUTEX(hash_resize_mutex);
476 static void xfrm_hash_resize(struct work_struct *work)
478 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
479 int dir, total;
481 mutex_lock(&hash_resize_mutex);
483 total = 0;
484 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
485 if (xfrm_bydst_should_resize(net, dir, &total))
486 xfrm_bydst_resize(net, dir);
488 if (xfrm_byidx_should_resize(net, total))
489 xfrm_byidx_resize(net, total);
491 mutex_unlock(&hash_resize_mutex);
494 /* Generate new index... KAME seems to generate them ordered by cost
495 * of an absolute inpredictability of ordering of rules. This will not pass. */
496 static u32 xfrm_gen_index(struct net *net, int dir)
498 static u32 idx_generator;
500 for (;;) {
501 struct hlist_node *entry;
502 struct hlist_head *list;
503 struct xfrm_policy *p;
504 u32 idx;
505 int found;
507 idx = (idx_generator | dir);
508 idx_generator += 8;
509 if (idx == 0)
510 idx = 8;
511 list = net->xfrm.policy_byidx + idx_hash(net, idx);
512 found = 0;
513 hlist_for_each_entry(p, entry, list, byidx) {
514 if (p->index == idx) {
515 found = 1;
516 break;
519 if (!found)
520 return idx;
524 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
526 u32 *p1 = (u32 *) s1;
527 u32 *p2 = (u32 *) s2;
528 int len = sizeof(struct xfrm_selector) / sizeof(u32);
529 int i;
531 for (i = 0; i < len; i++) {
532 if (p1[i] != p2[i])
533 return 1;
536 return 0;
539 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
541 struct net *net = xp_net(policy);
542 struct xfrm_policy *pol;
543 struct xfrm_policy *delpol;
544 struct hlist_head *chain;
545 struct hlist_node *entry, *newpos;
546 u32 mark = policy->mark.v & policy->mark.m;
548 write_lock_bh(&xfrm_policy_lock);
549 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
550 delpol = NULL;
551 newpos = NULL;
552 hlist_for_each_entry(pol, entry, chain, bydst) {
553 if (pol->type == policy->type &&
554 !selector_cmp(&pol->selector, &policy->selector) &&
555 (mark & pol->mark.m) == pol->mark.v &&
556 xfrm_sec_ctx_match(pol->security, policy->security) &&
557 !WARN_ON(delpol)) {
558 if (excl) {
559 write_unlock_bh(&xfrm_policy_lock);
560 return -EEXIST;
562 delpol = pol;
563 if (policy->priority > pol->priority)
564 continue;
565 } else if (policy->priority >= pol->priority) {
566 newpos = &pol->bydst;
567 continue;
569 if (delpol)
570 break;
572 if (newpos)
573 hlist_add_after(newpos, &policy->bydst);
574 else
575 hlist_add_head(&policy->bydst, chain);
576 xfrm_pol_hold(policy);
577 net->xfrm.policy_count[dir]++;
578 atomic_inc(&flow_cache_genid);
579 if (delpol)
580 __xfrm_policy_unlink(delpol, dir);
581 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
582 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
583 policy->curlft.add_time = get_seconds();
584 policy->curlft.use_time = 0;
585 if (!mod_timer(&policy->timer, jiffies + HZ))
586 xfrm_pol_hold(policy);
587 list_add(&policy->walk.all, &net->xfrm.policy_all);
588 write_unlock_bh(&xfrm_policy_lock);
590 if (delpol)
591 xfrm_policy_kill(delpol);
592 else if (xfrm_bydst_should_resize(net, dir, NULL))
593 schedule_work(&net->xfrm.policy_hash_work);
595 return 0;
597 EXPORT_SYMBOL(xfrm_policy_insert);
599 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
600 int dir, struct xfrm_selector *sel,
601 struct xfrm_sec_ctx *ctx, int delete,
602 int *err)
604 struct xfrm_policy *pol, *ret;
605 struct hlist_head *chain;
606 struct hlist_node *entry;
608 *err = 0;
609 write_lock_bh(&xfrm_policy_lock);
610 chain = policy_hash_bysel(net, sel, sel->family, dir);
611 ret = NULL;
612 hlist_for_each_entry(pol, entry, chain, bydst) {
613 if (pol->type == type &&
614 (mark & pol->mark.m) == pol->mark.v &&
615 !selector_cmp(sel, &pol->selector) &&
616 xfrm_sec_ctx_match(ctx, pol->security)) {
617 xfrm_pol_hold(pol);
618 if (delete) {
619 *err = security_xfrm_policy_delete(
620 pol->security);
621 if (*err) {
622 write_unlock_bh(&xfrm_policy_lock);
623 return pol;
625 __xfrm_policy_unlink(pol, dir);
627 ret = pol;
628 break;
631 write_unlock_bh(&xfrm_policy_lock);
633 if (ret && delete)
634 xfrm_policy_kill(ret);
635 return ret;
637 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
639 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
640 int dir, u32 id, int delete, int *err)
642 struct xfrm_policy *pol, *ret;
643 struct hlist_head *chain;
644 struct hlist_node *entry;
646 *err = -ENOENT;
647 if (xfrm_policy_id2dir(id) != dir)
648 return NULL;
650 *err = 0;
651 write_lock_bh(&xfrm_policy_lock);
652 chain = net->xfrm.policy_byidx + idx_hash(net, id);
653 ret = NULL;
654 hlist_for_each_entry(pol, entry, chain, byidx) {
655 if (pol->type == type && pol->index == id &&
656 (mark & pol->mark.m) == pol->mark.v) {
657 xfrm_pol_hold(pol);
658 if (delete) {
659 *err = security_xfrm_policy_delete(
660 pol->security);
661 if (*err) {
662 write_unlock_bh(&xfrm_policy_lock);
663 return pol;
665 __xfrm_policy_unlink(pol, dir);
667 ret = pol;
668 break;
671 write_unlock_bh(&xfrm_policy_lock);
673 if (ret && delete)
674 xfrm_policy_kill(ret);
675 return ret;
677 EXPORT_SYMBOL(xfrm_policy_byid);
679 #ifdef CONFIG_SECURITY_NETWORK_XFRM
680 static inline int
681 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
683 int dir, err = 0;
685 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
686 struct xfrm_policy *pol;
687 struct hlist_node *entry;
688 int i;
690 hlist_for_each_entry(pol, entry,
691 &net->xfrm.policy_inexact[dir], bydst) {
692 if (pol->type != type)
693 continue;
694 err = security_xfrm_policy_delete(pol->security);
695 if (err) {
696 xfrm_audit_policy_delete(pol, 0,
697 audit_info->loginuid,
698 audit_info->sessionid,
699 audit_info->secid);
700 return err;
703 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
704 hlist_for_each_entry(pol, entry,
705 net->xfrm.policy_bydst[dir].table + i,
706 bydst) {
707 if (pol->type != type)
708 continue;
709 err = security_xfrm_policy_delete(
710 pol->security);
711 if (err) {
712 xfrm_audit_policy_delete(pol, 0,
713 audit_info->loginuid,
714 audit_info->sessionid,
715 audit_info->secid);
716 return err;
721 return err;
723 #else
724 static inline int
725 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
727 return 0;
729 #endif
731 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
733 int dir, err = 0, cnt = 0;
735 write_lock_bh(&xfrm_policy_lock);
737 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
738 if (err)
739 goto out;
741 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
742 struct xfrm_policy *pol;
743 struct hlist_node *entry;
744 int i;
746 again1:
747 hlist_for_each_entry(pol, entry,
748 &net->xfrm.policy_inexact[dir], bydst) {
749 if (pol->type != type)
750 continue;
751 __xfrm_policy_unlink(pol, dir);
752 write_unlock_bh(&xfrm_policy_lock);
753 cnt++;
755 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
756 audit_info->sessionid,
757 audit_info->secid);
759 xfrm_policy_kill(pol);
761 write_lock_bh(&xfrm_policy_lock);
762 goto again1;
765 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
766 again2:
767 hlist_for_each_entry(pol, entry,
768 net->xfrm.policy_bydst[dir].table + i,
769 bydst) {
770 if (pol->type != type)
771 continue;
772 __xfrm_policy_unlink(pol, dir);
773 write_unlock_bh(&xfrm_policy_lock);
774 cnt++;
776 xfrm_audit_policy_delete(pol, 1,
777 audit_info->loginuid,
778 audit_info->sessionid,
779 audit_info->secid);
780 xfrm_policy_kill(pol);
782 write_lock_bh(&xfrm_policy_lock);
783 goto again2;
788 if (!cnt)
789 err = -ESRCH;
790 out:
791 write_unlock_bh(&xfrm_policy_lock);
792 return err;
794 EXPORT_SYMBOL(xfrm_policy_flush);
796 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
797 int (*func)(struct xfrm_policy *, int, int, void*),
798 void *data)
800 struct xfrm_policy *pol;
801 struct xfrm_policy_walk_entry *x;
802 int error = 0;
804 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
805 walk->type != XFRM_POLICY_TYPE_ANY)
806 return -EINVAL;
808 if (list_empty(&walk->walk.all) && walk->seq != 0)
809 return 0;
811 write_lock_bh(&xfrm_policy_lock);
812 if (list_empty(&walk->walk.all))
813 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
814 else
815 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
816 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
817 if (x->dead)
818 continue;
819 pol = container_of(x, struct xfrm_policy, walk);
820 if (walk->type != XFRM_POLICY_TYPE_ANY &&
821 walk->type != pol->type)
822 continue;
823 error = func(pol, xfrm_policy_id2dir(pol->index),
824 walk->seq, data);
825 if (error) {
826 list_move_tail(&walk->walk.all, &x->all);
827 goto out;
829 walk->seq++;
831 if (walk->seq == 0) {
832 error = -ENOENT;
833 goto out;
835 list_del_init(&walk->walk.all);
836 out:
837 write_unlock_bh(&xfrm_policy_lock);
838 return error;
840 EXPORT_SYMBOL(xfrm_policy_walk);
842 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
844 INIT_LIST_HEAD(&walk->walk.all);
845 walk->walk.dead = 1;
846 walk->type = type;
847 walk->seq = 0;
849 EXPORT_SYMBOL(xfrm_policy_walk_init);
851 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
853 if (list_empty(&walk->walk.all))
854 return;
856 write_lock_bh(&xfrm_policy_lock);
857 list_del(&walk->walk.all);
858 write_unlock_bh(&xfrm_policy_lock);
860 EXPORT_SYMBOL(xfrm_policy_walk_done);
863 * Find policy to apply to this flow.
865 * Returns 0 if policy found, else an -errno.
867 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
868 u8 type, u16 family, int dir)
870 struct xfrm_selector *sel = &pol->selector;
871 int match, ret = -ESRCH;
873 if (pol->family != family ||
874 (fl->mark & pol->mark.m) != pol->mark.v ||
875 pol->type != type)
876 return ret;
878 match = xfrm_selector_match(sel, fl, family);
879 if (match)
880 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
881 dir);
883 return ret;
886 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
887 struct flowi *fl,
888 u16 family, u8 dir)
890 int err;
891 struct xfrm_policy *pol, *ret;
892 xfrm_address_t *daddr, *saddr;
893 struct hlist_node *entry;
894 struct hlist_head *chain;
895 u32 priority = ~0U;
897 daddr = xfrm_flowi_daddr(fl, family);
898 saddr = xfrm_flowi_saddr(fl, family);
899 if (unlikely(!daddr || !saddr))
900 return NULL;
902 read_lock_bh(&xfrm_policy_lock);
903 chain = policy_hash_direct(net, daddr, saddr, family, dir);
904 ret = NULL;
905 hlist_for_each_entry(pol, entry, chain, bydst) {
906 err = xfrm_policy_match(pol, fl, type, family, dir);
907 if (err) {
908 if (err == -ESRCH)
909 continue;
910 else {
911 ret = ERR_PTR(err);
912 goto fail;
914 } else {
915 ret = pol;
916 priority = ret->priority;
917 break;
920 chain = &net->xfrm.policy_inexact[dir];
921 hlist_for_each_entry(pol, entry, chain, bydst) {
922 err = xfrm_policy_match(pol, fl, type, family, dir);
923 if (err) {
924 if (err == -ESRCH)
925 continue;
926 else {
927 ret = ERR_PTR(err);
928 goto fail;
930 } else if (pol->priority < priority) {
931 ret = pol;
932 break;
935 if (ret)
936 xfrm_pol_hold(ret);
937 fail:
938 read_unlock_bh(&xfrm_policy_lock);
940 return ret;
943 static struct xfrm_policy *
944 __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
946 #ifdef CONFIG_XFRM_SUB_POLICY
947 struct xfrm_policy *pol;
949 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
950 if (pol != NULL)
951 return pol;
952 #endif
953 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
956 static struct flow_cache_object *
957 xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
958 u8 dir, struct flow_cache_object *old_obj, void *ctx)
960 struct xfrm_policy *pol;
962 if (old_obj)
963 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
965 pol = __xfrm_policy_lookup(net, fl, family, dir);
966 if (IS_ERR_OR_NULL(pol))
967 return ERR_CAST(pol);
969 /* Resolver returns two references:
970 * one for cache and one for caller of flow_cache_lookup() */
971 xfrm_pol_hold(pol);
973 return &pol->flo;
976 static inline int policy_to_flow_dir(int dir)
978 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
979 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
980 XFRM_POLICY_FWD == FLOW_DIR_FWD)
981 return dir;
982 switch (dir) {
983 default:
984 case XFRM_POLICY_IN:
985 return FLOW_DIR_IN;
986 case XFRM_POLICY_OUT:
987 return FLOW_DIR_OUT;
988 case XFRM_POLICY_FWD:
989 return FLOW_DIR_FWD;
993 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
995 struct xfrm_policy *pol;
997 read_lock_bh(&xfrm_policy_lock);
998 if ((pol = sk->sk_policy[dir]) != NULL) {
999 int match = xfrm_selector_match(&pol->selector, fl,
1000 sk->sk_family);
1001 int err = 0;
1003 if (match) {
1004 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1005 pol = NULL;
1006 goto out;
1008 err = security_xfrm_policy_lookup(pol->security,
1009 fl->secid,
1010 policy_to_flow_dir(dir));
1011 if (!err)
1012 xfrm_pol_hold(pol);
1013 else if (err == -ESRCH)
1014 pol = NULL;
1015 else
1016 pol = ERR_PTR(err);
1017 } else
1018 pol = NULL;
1020 out:
1021 read_unlock_bh(&xfrm_policy_lock);
1022 return pol;
1025 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1027 struct net *net = xp_net(pol);
1028 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1029 pol->family, dir);
1031 list_add(&pol->walk.all, &net->xfrm.policy_all);
1032 hlist_add_head(&pol->bydst, chain);
1033 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1034 net->xfrm.policy_count[dir]++;
1035 xfrm_pol_hold(pol);
1037 if (xfrm_bydst_should_resize(net, dir, NULL))
1038 schedule_work(&net->xfrm.policy_hash_work);
1041 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1042 int dir)
1044 struct net *net = xp_net(pol);
1046 if (hlist_unhashed(&pol->bydst))
1047 return NULL;
1049 hlist_del(&pol->bydst);
1050 hlist_del(&pol->byidx);
1051 list_del(&pol->walk.all);
1052 net->xfrm.policy_count[dir]--;
1054 return pol;
1057 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1059 write_lock_bh(&xfrm_policy_lock);
1060 pol = __xfrm_policy_unlink(pol, dir);
1061 write_unlock_bh(&xfrm_policy_lock);
1062 if (pol) {
1063 xfrm_policy_kill(pol);
1064 return 0;
1066 return -ENOENT;
1068 EXPORT_SYMBOL(xfrm_policy_delete);
1070 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1072 struct net *net = xp_net(pol);
1073 struct xfrm_policy *old_pol;
1075 #ifdef CONFIG_XFRM_SUB_POLICY
1076 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1077 return -EINVAL;
1078 #endif
1080 write_lock_bh(&xfrm_policy_lock);
1081 old_pol = sk->sk_policy[dir];
1082 sk->sk_policy[dir] = pol;
1083 if (pol) {
1084 pol->curlft.add_time = get_seconds();
1085 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1086 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1088 if (old_pol)
1089 /* Unlinking succeeds always. This is the only function
1090 * allowed to delete or replace socket policy.
1092 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1093 write_unlock_bh(&xfrm_policy_lock);
1095 if (old_pol) {
1096 xfrm_policy_kill(old_pol);
1098 return 0;
1101 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1103 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1105 if (newp) {
1106 newp->selector = old->selector;
1107 if (security_xfrm_policy_clone(old->security,
1108 &newp->security)) {
1109 kfree(newp);
1110 return NULL; /* ENOMEM */
1112 newp->lft = old->lft;
1113 newp->curlft = old->curlft;
1114 newp->mark = old->mark;
1115 newp->action = old->action;
1116 newp->flags = old->flags;
1117 newp->xfrm_nr = old->xfrm_nr;
1118 newp->index = old->index;
1119 newp->type = old->type;
1120 memcpy(newp->xfrm_vec, old->xfrm_vec,
1121 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1122 write_lock_bh(&xfrm_policy_lock);
1123 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1124 write_unlock_bh(&xfrm_policy_lock);
1125 xfrm_pol_put(newp);
1127 return newp;
1130 int __xfrm_sk_clone_policy(struct sock *sk)
1132 struct xfrm_policy *p0 = sk->sk_policy[0],
1133 *p1 = sk->sk_policy[1];
1135 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1136 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1137 return -ENOMEM;
1138 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1139 return -ENOMEM;
1140 return 0;
1143 static int
1144 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1145 unsigned short family)
1147 int err;
1148 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1150 if (unlikely(afinfo == NULL))
1151 return -EINVAL;
1152 err = afinfo->get_saddr(net, local, remote);
1153 xfrm_policy_put_afinfo(afinfo);
1154 return err;
1157 /* Resolve list of templates for the flow, given policy. */
1159 static int
1160 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1161 struct xfrm_state **xfrm,
1162 unsigned short family)
1164 struct net *net = xp_net(policy);
1165 int nx;
1166 int i, error;
1167 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1168 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1169 xfrm_address_t tmp;
1171 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1172 struct xfrm_state *x;
1173 xfrm_address_t *remote = daddr;
1174 xfrm_address_t *local = saddr;
1175 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1177 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1178 tmpl->mode == XFRM_MODE_BEET) {
1179 remote = &tmpl->id.daddr;
1180 local = &tmpl->saddr;
1181 if (xfrm_addr_any(local, tmpl->encap_family)) {
1182 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1183 if (error)
1184 goto fail;
1185 local = &tmp;
1189 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1191 if (x && x->km.state == XFRM_STATE_VALID) {
1192 xfrm[nx++] = x;
1193 daddr = remote;
1194 saddr = local;
1195 continue;
1197 if (x) {
1198 error = (x->km.state == XFRM_STATE_ERROR ?
1199 -EINVAL : -EAGAIN);
1200 xfrm_state_put(x);
1202 else if (error == -ESRCH)
1203 error = -EAGAIN;
1205 if (!tmpl->optional)
1206 goto fail;
1208 return nx;
1210 fail:
1211 for (nx--; nx>=0; nx--)
1212 xfrm_state_put(xfrm[nx]);
1213 return error;
1216 static int
1217 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1218 struct xfrm_state **xfrm,
1219 unsigned short family)
1221 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1222 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1223 int cnx = 0;
1224 int error;
1225 int ret;
1226 int i;
1228 for (i = 0; i < npols; i++) {
1229 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1230 error = -ENOBUFS;
1231 goto fail;
1234 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1235 if (ret < 0) {
1236 error = ret;
1237 goto fail;
1238 } else
1239 cnx += ret;
1242 /* found states are sorted for outbound processing */
1243 if (npols > 1)
1244 xfrm_state_sort(xfrm, tpp, cnx, family);
1246 return cnx;
1248 fail:
1249 for (cnx--; cnx>=0; cnx--)
1250 xfrm_state_put(tpp[cnx]);
1251 return error;
1255 /* Check that the bundle accepts the flow and its components are
1256 * still valid.
1259 static inline int xfrm_get_tos(struct flowi *fl, int family)
1261 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1262 int tos;
1264 if (!afinfo)
1265 return -EINVAL;
1267 tos = afinfo->get_tos(fl);
1269 xfrm_policy_put_afinfo(afinfo);
1271 return tos;
1274 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1276 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1277 struct dst_entry *dst = &xdst->u.dst;
1279 if (xdst->route == NULL) {
1280 /* Dummy bundle - if it has xfrms we were not
1281 * able to build bundle as template resolution failed.
1282 * It means we need to try again resolving. */
1283 if (xdst->num_xfrms > 0)
1284 return NULL;
1285 } else {
1286 /* Real bundle */
1287 if (stale_bundle(dst))
1288 return NULL;
1291 dst_hold(dst);
1292 return flo;
1295 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1297 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1298 struct dst_entry *dst = &xdst->u.dst;
1300 if (!xdst->route)
1301 return 0;
1302 if (stale_bundle(dst))
1303 return 0;
1305 return 1;
1308 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1310 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1311 struct dst_entry *dst = &xdst->u.dst;
1313 dst_free(dst);
1316 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1317 .get = xfrm_bundle_flo_get,
1318 .check = xfrm_bundle_flo_check,
1319 .delete = xfrm_bundle_flo_delete,
1322 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1324 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1325 struct dst_ops *dst_ops;
1326 struct xfrm_dst *xdst;
1328 if (!afinfo)
1329 return ERR_PTR(-EINVAL);
1331 switch (family) {
1332 case AF_INET:
1333 dst_ops = &net->xfrm.xfrm4_dst_ops;
1334 break;
1335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1336 case AF_INET6:
1337 dst_ops = &net->xfrm.xfrm6_dst_ops;
1338 break;
1339 #endif
1340 default:
1341 BUG();
1343 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
1344 xfrm_policy_put_afinfo(afinfo);
1346 xdst->flo.ops = &xfrm_bundle_fc_ops;
1348 return xdst;
1351 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1352 int nfheader_len)
1354 struct xfrm_policy_afinfo *afinfo =
1355 xfrm_policy_get_afinfo(dst->ops->family);
1356 int err;
1358 if (!afinfo)
1359 return -EINVAL;
1361 err = afinfo->init_path(path, dst, nfheader_len);
1363 xfrm_policy_put_afinfo(afinfo);
1365 return err;
1368 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1369 struct flowi *fl)
1371 struct xfrm_policy_afinfo *afinfo =
1372 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1373 int err;
1375 if (!afinfo)
1376 return -EINVAL;
1378 err = afinfo->fill_dst(xdst, dev, fl);
1380 xfrm_policy_put_afinfo(afinfo);
1382 return err;
1386 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1387 * all the metrics... Shortly, bundle a bundle.
1390 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1391 struct xfrm_state **xfrm, int nx,
1392 struct flowi *fl,
1393 struct dst_entry *dst)
1395 struct net *net = xp_net(policy);
1396 unsigned long now = jiffies;
1397 struct net_device *dev;
1398 struct dst_entry *dst_prev = NULL;
1399 struct dst_entry *dst0 = NULL;
1400 int i = 0;
1401 int err;
1402 int header_len = 0;
1403 int nfheader_len = 0;
1404 int trailer_len = 0;
1405 int tos;
1406 int family = policy->selector.family;
1407 xfrm_address_t saddr, daddr;
1409 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1411 tos = xfrm_get_tos(fl, family);
1412 err = tos;
1413 if (tos < 0)
1414 goto put_states;
1416 dst_hold(dst);
1418 for (; i < nx; i++) {
1419 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1420 struct dst_entry *dst1 = &xdst->u.dst;
1422 err = PTR_ERR(xdst);
1423 if (IS_ERR(xdst)) {
1424 dst_release(dst);
1425 goto put_states;
1428 if (!dst_prev)
1429 dst0 = dst1;
1430 else {
1431 dst_prev->child = dst_clone(dst1);
1432 dst1->flags |= DST_NOHASH;
1435 xdst->route = dst;
1436 dst_copy_metrics(dst1, dst);
1438 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1439 family = xfrm[i]->props.family;
1440 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1441 family);
1442 err = PTR_ERR(dst);
1443 if (IS_ERR(dst))
1444 goto put_states;
1445 } else
1446 dst_hold(dst);
1448 dst1->xfrm = xfrm[i];
1449 xdst->xfrm_genid = xfrm[i]->genid;
1451 dst1->obsolete = -1;
1452 dst1->flags |= DST_HOST;
1453 dst1->lastuse = now;
1455 dst1->input = dst_discard;
1456 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1458 dst1->next = dst_prev;
1459 dst_prev = dst1;
1461 header_len += xfrm[i]->props.header_len;
1462 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1463 nfheader_len += xfrm[i]->props.header_len;
1464 trailer_len += xfrm[i]->props.trailer_len;
1467 dst_prev->child = dst;
1468 dst0->path = dst;
1470 err = -ENODEV;
1471 dev = dst->dev;
1472 if (!dev)
1473 goto free_dst;
1475 /* Copy neighbour for reachability confirmation */
1476 dst0->neighbour = neigh_clone(dst->neighbour);
1478 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1479 xfrm_init_pmtu(dst_prev);
1481 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1482 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1484 err = xfrm_fill_dst(xdst, dev, fl);
1485 if (err)
1486 goto free_dst;
1488 dst_prev->header_len = header_len;
1489 dst_prev->trailer_len = trailer_len;
1490 header_len -= xdst->u.dst.xfrm->props.header_len;
1491 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1494 out:
1495 return dst0;
1497 put_states:
1498 for (; i < nx; i++)
1499 xfrm_state_put(xfrm[i]);
1500 free_dst:
1501 if (dst0)
1502 dst_free(dst0);
1503 dst0 = ERR_PTR(err);
1504 goto out;
1507 static int inline
1508 xfrm_dst_alloc_copy(void **target, void *src, int size)
1510 if (!*target) {
1511 *target = kmalloc(size, GFP_ATOMIC);
1512 if (!*target)
1513 return -ENOMEM;
1515 memcpy(*target, src, size);
1516 return 0;
1519 static int inline
1520 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1522 #ifdef CONFIG_XFRM_SUB_POLICY
1523 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1524 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1525 sel, sizeof(*sel));
1526 #else
1527 return 0;
1528 #endif
1531 static int inline
1532 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1534 #ifdef CONFIG_XFRM_SUB_POLICY
1535 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1536 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1537 #else
1538 return 0;
1539 #endif
1542 static int xfrm_expand_policies(struct flowi *fl, u16 family,
1543 struct xfrm_policy **pols,
1544 int *num_pols, int *num_xfrms)
1546 int i;
1548 if (*num_pols == 0 || !pols[0]) {
1549 *num_pols = 0;
1550 *num_xfrms = 0;
1551 return 0;
1553 if (IS_ERR(pols[0]))
1554 return PTR_ERR(pols[0]);
1556 *num_xfrms = pols[0]->xfrm_nr;
1558 #ifdef CONFIG_XFRM_SUB_POLICY
1559 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1560 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1561 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1562 XFRM_POLICY_TYPE_MAIN,
1563 fl, family,
1564 XFRM_POLICY_OUT);
1565 if (pols[1]) {
1566 if (IS_ERR(pols[1])) {
1567 xfrm_pols_put(pols, *num_pols);
1568 return PTR_ERR(pols[1]);
1570 (*num_pols) ++;
1571 (*num_xfrms) += pols[1]->xfrm_nr;
1574 #endif
1575 for (i = 0; i < *num_pols; i++) {
1576 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1577 *num_xfrms = -1;
1578 break;
1582 return 0;
1586 static struct xfrm_dst *
1587 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1588 struct flowi *fl, u16 family,
1589 struct dst_entry *dst_orig)
1591 struct net *net = xp_net(pols[0]);
1592 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1593 struct dst_entry *dst;
1594 struct xfrm_dst *xdst;
1595 int err;
1597 /* Try to instantiate a bundle */
1598 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1599 if (err <= 0) {
1600 if (err != 0 && err != -EAGAIN)
1601 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1602 return ERR_PTR(err);
1605 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1606 if (IS_ERR(dst)) {
1607 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1608 return ERR_CAST(dst);
1611 xdst = (struct xfrm_dst *)dst;
1612 xdst->num_xfrms = err;
1613 if (num_pols > 1)
1614 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1615 else
1616 err = xfrm_dst_update_origin(dst, fl);
1617 if (unlikely(err)) {
1618 dst_free(dst);
1619 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1620 return ERR_PTR(err);
1623 xdst->num_pols = num_pols;
1624 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1625 xdst->policy_genid = atomic_read(&pols[0]->genid);
1627 return xdst;
1630 static struct flow_cache_object *
1631 xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1632 struct flow_cache_object *oldflo, void *ctx)
1634 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1635 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1636 struct xfrm_dst *xdst, *new_xdst;
1637 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1639 /* Check if the policies from old bundle are usable */
1640 xdst = NULL;
1641 if (oldflo) {
1642 xdst = container_of(oldflo, struct xfrm_dst, flo);
1643 num_pols = xdst->num_pols;
1644 num_xfrms = xdst->num_xfrms;
1645 pol_dead = 0;
1646 for (i = 0; i < num_pols; i++) {
1647 pols[i] = xdst->pols[i];
1648 pol_dead |= pols[i]->walk.dead;
1650 if (pol_dead) {
1651 dst_free(&xdst->u.dst);
1652 xdst = NULL;
1653 num_pols = 0;
1654 num_xfrms = 0;
1655 oldflo = NULL;
1659 /* Resolve policies to use if we couldn't get them from
1660 * previous cache entry */
1661 if (xdst == NULL) {
1662 num_pols = 1;
1663 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1664 err = xfrm_expand_policies(fl, family, pols,
1665 &num_pols, &num_xfrms);
1666 if (err < 0)
1667 goto inc_error;
1668 if (num_pols == 0)
1669 return NULL;
1670 if (num_xfrms <= 0)
1671 goto make_dummy_bundle;
1674 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1675 if (IS_ERR(new_xdst)) {
1676 err = PTR_ERR(new_xdst);
1677 if (err != -EAGAIN)
1678 goto error;
1679 if (oldflo == NULL)
1680 goto make_dummy_bundle;
1681 dst_hold(&xdst->u.dst);
1682 return oldflo;
1683 } else if (new_xdst == NULL) {
1684 num_xfrms = 0;
1685 if (oldflo == NULL)
1686 goto make_dummy_bundle;
1687 xdst->num_xfrms = 0;
1688 dst_hold(&xdst->u.dst);
1689 return oldflo;
1692 /* Kill the previous bundle */
1693 if (xdst) {
1694 /* The policies were stolen for newly generated bundle */
1695 xdst->num_pols = 0;
1696 dst_free(&xdst->u.dst);
1699 /* Flow cache does not have reference, it dst_free()'s,
1700 * but we do need to return one reference for original caller */
1701 dst_hold(&new_xdst->u.dst);
1702 return &new_xdst->flo;
1704 make_dummy_bundle:
1705 /* We found policies, but there's no bundles to instantiate:
1706 * either because the policy blocks, has no transformations or
1707 * we could not build template (no xfrm_states).*/
1708 xdst = xfrm_alloc_dst(net, family);
1709 if (IS_ERR(xdst)) {
1710 xfrm_pols_put(pols, num_pols);
1711 return ERR_CAST(xdst);
1713 xdst->num_pols = num_pols;
1714 xdst->num_xfrms = num_xfrms;
1715 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1717 dst_hold(&xdst->u.dst);
1718 return &xdst->flo;
1720 inc_error:
1721 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1722 error:
1723 if (xdst != NULL)
1724 dst_free(&xdst->u.dst);
1725 else
1726 xfrm_pols_put(pols, num_pols);
1727 return ERR_PTR(err);
1730 /* Main function: finds/creates a bundle for given flow.
1732 * At the moment we eat a raw IP route. Mostly to speed up lookups
1733 * on interfaces with disabled IPsec.
1735 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1736 struct sock *sk, int flags)
1738 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1739 struct flow_cache_object *flo;
1740 struct xfrm_dst *xdst;
1741 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1742 u16 family = dst_orig->ops->family;
1743 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1744 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1746 restart:
1747 dst = NULL;
1748 xdst = NULL;
1749 route = NULL;
1751 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1752 num_pols = 1;
1753 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1754 err = xfrm_expand_policies(fl, family, pols,
1755 &num_pols, &num_xfrms);
1756 if (err < 0)
1757 goto dropdst;
1759 if (num_pols) {
1760 if (num_xfrms <= 0) {
1761 drop_pols = num_pols;
1762 goto no_transform;
1765 xdst = xfrm_resolve_and_create_bundle(
1766 pols, num_pols, fl,
1767 family, dst_orig);
1768 if (IS_ERR(xdst)) {
1769 xfrm_pols_put(pols, num_pols);
1770 err = PTR_ERR(xdst);
1771 goto dropdst;
1772 } else if (xdst == NULL) {
1773 num_xfrms = 0;
1774 drop_pols = num_pols;
1775 goto no_transform;
1778 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1779 xdst->u.dst.next = xfrm_policy_sk_bundles;
1780 xfrm_policy_sk_bundles = &xdst->u.dst;
1781 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1783 route = xdst->route;
1787 if (xdst == NULL) {
1788 /* To accelerate a bit... */
1789 if ((dst_orig->flags & DST_NOXFRM) ||
1790 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1791 goto nopol;
1793 flo = flow_cache_lookup(net, fl, family, dir,
1794 xfrm_bundle_lookup, dst_orig);
1795 if (flo == NULL)
1796 goto nopol;
1797 if (IS_ERR(flo)) {
1798 err = PTR_ERR(flo);
1799 goto dropdst;
1801 xdst = container_of(flo, struct xfrm_dst, flo);
1803 num_pols = xdst->num_pols;
1804 num_xfrms = xdst->num_xfrms;
1805 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1806 route = xdst->route;
1809 dst = &xdst->u.dst;
1810 if (route == NULL && num_xfrms > 0) {
1811 /* The only case when xfrm_bundle_lookup() returns a
1812 * bundle with null route, is when the template could
1813 * not be resolved. It means policies are there, but
1814 * bundle could not be created, since we don't yet
1815 * have the xfrm_state's. We need to wait for KM to
1816 * negotiate new SA's or bail out with error.*/
1817 if (net->xfrm.sysctl_larval_drop) {
1818 /* EREMOTE tells the caller to generate
1819 * a one-shot blackhole route. */
1820 dst_release(dst);
1821 xfrm_pols_put(pols, drop_pols);
1822 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1823 return -EREMOTE;
1825 if (flags & XFRM_LOOKUP_WAIT) {
1826 DECLARE_WAITQUEUE(wait, current);
1828 add_wait_queue(&net->xfrm.km_waitq, &wait);
1829 set_current_state(TASK_INTERRUPTIBLE);
1830 schedule();
1831 set_current_state(TASK_RUNNING);
1832 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1834 if (!signal_pending(current)) {
1835 dst_release(dst);
1836 goto restart;
1839 err = -ERESTART;
1840 } else
1841 err = -EAGAIN;
1843 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1844 goto error;
1847 no_transform:
1848 if (num_pols == 0)
1849 goto nopol;
1851 if ((flags & XFRM_LOOKUP_ICMP) &&
1852 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1853 err = -ENOENT;
1854 goto error;
1857 for (i = 0; i < num_pols; i++)
1858 pols[i]->curlft.use_time = get_seconds();
1860 if (num_xfrms < 0) {
1861 /* Prohibit the flow */
1862 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1863 err = -EPERM;
1864 goto error;
1865 } else if (num_xfrms > 0) {
1866 /* Flow transformed */
1867 *dst_p = dst;
1868 dst_release(dst_orig);
1869 } else {
1870 /* Flow passes untransformed */
1871 dst_release(dst);
1874 xfrm_pols_put(pols, drop_pols);
1875 return 0;
1877 nopol:
1878 if (!(flags & XFRM_LOOKUP_ICMP))
1879 goto ok;
1880 err = -ENOENT;
1881 error:
1882 dst_release(dst);
1883 dropdst:
1884 dst_release(dst_orig);
1885 *dst_p = NULL;
1886 xfrm_pols_put(pols, drop_pols);
1887 return err;
1889 EXPORT_SYMBOL(__xfrm_lookup);
1891 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1892 struct sock *sk, int flags)
1894 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1896 if (err == -EREMOTE) {
1897 dst_release(*dst_p);
1898 *dst_p = NULL;
1899 err = -EAGAIN;
1902 return err;
1904 EXPORT_SYMBOL(xfrm_lookup);
1906 static inline int
1907 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1909 struct xfrm_state *x;
1911 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1912 return 0;
1913 x = skb->sp->xvec[idx];
1914 if (!x->type->reject)
1915 return 0;
1916 return x->type->reject(x, skb, fl);
1919 /* When skb is transformed back to its "native" form, we have to
1920 * check policy restrictions. At the moment we make this in maximally
1921 * stupid way. Shame on me. :-) Of course, connected sockets must
1922 * have policy cached at them.
1925 static inline int
1926 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1927 unsigned short family)
1929 if (xfrm_state_kern(x))
1930 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1931 return x->id.proto == tmpl->id.proto &&
1932 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1933 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1934 x->props.mode == tmpl->mode &&
1935 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1936 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1937 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1938 xfrm_state_addr_cmp(tmpl, x, family));
1942 * 0 or more than 0 is returned when validation is succeeded (either bypass
1943 * because of optional transport mode, or next index of the mathced secpath
1944 * state with the template.
1945 * -1 is returned when no matching template is found.
1946 * Otherwise "-2 - errored_index" is returned.
1948 static inline int
1949 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1950 unsigned short family)
1952 int idx = start;
1954 if (tmpl->optional) {
1955 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1956 return start;
1957 } else
1958 start = -1;
1959 for (; idx < sp->len; idx++) {
1960 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1961 return ++idx;
1962 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1963 if (start == -1)
1964 start = -2-idx;
1965 break;
1968 return start;
1971 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1972 unsigned int family, int reverse)
1974 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1975 int err;
1977 if (unlikely(afinfo == NULL))
1978 return -EAFNOSUPPORT;
1980 afinfo->decode_session(skb, fl, reverse);
1981 err = security_xfrm_decode_session(skb, &fl->secid);
1982 xfrm_policy_put_afinfo(afinfo);
1983 return err;
1985 EXPORT_SYMBOL(__xfrm_decode_session);
1987 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1989 for (; k < sp->len; k++) {
1990 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1991 *idxp = k;
1992 return 1;
1996 return 0;
1999 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2000 unsigned short family)
2002 struct net *net = dev_net(skb->dev);
2003 struct xfrm_policy *pol;
2004 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2005 int npols = 0;
2006 int xfrm_nr;
2007 int pi;
2008 int reverse;
2009 struct flowi fl;
2010 u8 fl_dir;
2011 int xerr_idx = -1;
2013 reverse = dir & ~XFRM_POLICY_MASK;
2014 dir &= XFRM_POLICY_MASK;
2015 fl_dir = policy_to_flow_dir(dir);
2017 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2018 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2019 return 0;
2022 nf_nat_decode_session(skb, &fl, family);
2024 /* First, check used SA against their selectors. */
2025 if (skb->sp) {
2026 int i;
2028 for (i=skb->sp->len-1; i>=0; i--) {
2029 struct xfrm_state *x = skb->sp->xvec[i];
2030 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2031 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2032 return 0;
2037 pol = NULL;
2038 if (sk && sk->sk_policy[dir]) {
2039 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2040 if (IS_ERR(pol)) {
2041 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2042 return 0;
2046 if (!pol) {
2047 struct flow_cache_object *flo;
2049 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2050 xfrm_policy_lookup, NULL);
2051 if (IS_ERR_OR_NULL(flo))
2052 pol = ERR_CAST(flo);
2053 else
2054 pol = container_of(flo, struct xfrm_policy, flo);
2057 if (IS_ERR(pol)) {
2058 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2059 return 0;
2062 if (!pol) {
2063 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2064 xfrm_secpath_reject(xerr_idx, skb, &fl);
2065 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2066 return 0;
2068 return 1;
2071 pol->curlft.use_time = get_seconds();
2073 pols[0] = pol;
2074 npols ++;
2075 #ifdef CONFIG_XFRM_SUB_POLICY
2076 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2077 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2078 &fl, family,
2079 XFRM_POLICY_IN);
2080 if (pols[1]) {
2081 if (IS_ERR(pols[1])) {
2082 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2083 return 0;
2085 pols[1]->curlft.use_time = get_seconds();
2086 npols ++;
2089 #endif
2091 if (pol->action == XFRM_POLICY_ALLOW) {
2092 struct sec_path *sp;
2093 static struct sec_path dummy;
2094 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2095 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2096 struct xfrm_tmpl **tpp = tp;
2097 int ti = 0;
2098 int i, k;
2100 if ((sp = skb->sp) == NULL)
2101 sp = &dummy;
2103 for (pi = 0; pi < npols; pi++) {
2104 if (pols[pi] != pol &&
2105 pols[pi]->action != XFRM_POLICY_ALLOW) {
2106 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2107 goto reject;
2109 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2110 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2111 goto reject_error;
2113 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2114 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2116 xfrm_nr = ti;
2117 if (npols > 1) {
2118 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2119 tpp = stp;
2122 /* For each tunnel xfrm, find the first matching tmpl.
2123 * For each tmpl before that, find corresponding xfrm.
2124 * Order is _important_. Later we will implement
2125 * some barriers, but at the moment barriers
2126 * are implied between each two transformations.
2128 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2129 k = xfrm_policy_ok(tpp[i], sp, k, family);
2130 if (k < 0) {
2131 if (k < -1)
2132 /* "-2 - errored_index" returned */
2133 xerr_idx = -(2+k);
2134 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2135 goto reject;
2139 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2140 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2141 goto reject;
2144 xfrm_pols_put(pols, npols);
2145 return 1;
2147 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2149 reject:
2150 xfrm_secpath_reject(xerr_idx, skb, &fl);
2151 reject_error:
2152 xfrm_pols_put(pols, npols);
2153 return 0;
2155 EXPORT_SYMBOL(__xfrm_policy_check);
2157 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2159 struct net *net = dev_net(skb->dev);
2160 struct flowi fl;
2161 struct dst_entry *dst;
2162 int res;
2164 if (xfrm_decode_session(skb, &fl, family) < 0) {
2165 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2166 return 0;
2169 skb_dst_force(skb);
2170 dst = skb_dst(skb);
2172 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2173 skb_dst_set(skb, dst);
2174 return res;
2176 EXPORT_SYMBOL(__xfrm_route_forward);
2178 /* Optimize later using cookies and generation ids. */
2180 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2182 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2183 * to "-1" to force all XFRM destinations to get validated by
2184 * dst_ops->check on every use. We do this because when a
2185 * normal route referenced by an XFRM dst is obsoleted we do
2186 * not go looking around for all parent referencing XFRM dsts
2187 * so that we can invalidate them. It is just too much work.
2188 * Instead we make the checks here on every use. For example:
2190 * XFRM dst A --> IPv4 dst X
2192 * X is the "xdst->route" of A (X is also the "dst->path" of A
2193 * in this example). If X is marked obsolete, "A" will not
2194 * notice. That's what we are validating here via the
2195 * stale_bundle() check.
2197 * When a policy's bundle is pruned, we dst_free() the XFRM
2198 * dst which causes it's ->obsolete field to be set to a
2199 * positive non-zero integer. If an XFRM dst has been pruned
2200 * like this, we want to force a new route lookup.
2202 if (dst->obsolete < 0 && !stale_bundle(dst))
2203 return dst;
2205 return NULL;
2208 static int stale_bundle(struct dst_entry *dst)
2210 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2213 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2215 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2216 dst->dev = dev_net(dev)->loopback_dev;
2217 dev_hold(dst->dev);
2218 dev_put(dev);
2221 EXPORT_SYMBOL(xfrm_dst_ifdown);
2223 static void xfrm_link_failure(struct sk_buff *skb)
2225 /* Impossible. Such dst must be popped before reaches point of failure. */
2228 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2230 if (dst) {
2231 if (dst->obsolete) {
2232 dst_release(dst);
2233 dst = NULL;
2236 return dst;
2239 static void __xfrm_garbage_collect(struct net *net)
2241 struct dst_entry *head, *next;
2243 flow_cache_flush();
2245 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2246 head = xfrm_policy_sk_bundles;
2247 xfrm_policy_sk_bundles = NULL;
2248 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2250 while (head) {
2251 next = head->next;
2252 dst_free(head);
2253 head = next;
2257 static void xfrm_init_pmtu(struct dst_entry *dst)
2259 do {
2260 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2261 u32 pmtu, route_mtu_cached;
2263 pmtu = dst_mtu(dst->child);
2264 xdst->child_mtu_cached = pmtu;
2266 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2268 route_mtu_cached = dst_mtu(xdst->route);
2269 xdst->route_mtu_cached = route_mtu_cached;
2271 if (pmtu > route_mtu_cached)
2272 pmtu = route_mtu_cached;
2274 dst_metric_set(dst, RTAX_MTU, pmtu);
2275 } while ((dst = dst->next));
2278 /* Check that the bundle accepts the flow and its components are
2279 * still valid.
2282 static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2283 struct flowi *fl, int family, int strict)
2285 struct dst_entry *dst = &first->u.dst;
2286 struct xfrm_dst *last;
2287 u32 mtu;
2289 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2290 (dst->dev && !netif_running(dst->dev)))
2291 return 0;
2292 #ifdef CONFIG_XFRM_SUB_POLICY
2293 if (fl) {
2294 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2295 return 0;
2296 if (first->partner &&
2297 !xfrm_selector_match(first->partner, fl, family))
2298 return 0;
2300 #endif
2302 last = NULL;
2304 do {
2305 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2307 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2308 return 0;
2309 if (fl && pol &&
2310 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2311 return 0;
2312 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2313 return 0;
2314 if (xdst->xfrm_genid != dst->xfrm->genid)
2315 return 0;
2316 if (xdst->num_pols > 0 &&
2317 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2318 return 0;
2320 if (strict && fl &&
2321 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2322 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2323 return 0;
2325 mtu = dst_mtu(dst->child);
2326 if (xdst->child_mtu_cached != mtu) {
2327 last = xdst;
2328 xdst->child_mtu_cached = mtu;
2331 if (!dst_check(xdst->route, xdst->route_cookie))
2332 return 0;
2333 mtu = dst_mtu(xdst->route);
2334 if (xdst->route_mtu_cached != mtu) {
2335 last = xdst;
2336 xdst->route_mtu_cached = mtu;
2339 dst = dst->child;
2340 } while (dst->xfrm);
2342 if (likely(!last))
2343 return 1;
2345 mtu = last->child_mtu_cached;
2346 for (;;) {
2347 dst = &last->u.dst;
2349 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2350 if (mtu > last->route_mtu_cached)
2351 mtu = last->route_mtu_cached;
2352 dst_metric_set(dst, RTAX_MTU, mtu);
2354 if (last == first)
2355 break;
2357 last = (struct xfrm_dst *)last->u.dst.next;
2358 last->child_mtu_cached = mtu;
2361 return 1;
2364 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2366 return dst_metric_advmss(dst->path);
2369 static unsigned int xfrm_default_mtu(const struct dst_entry *dst)
2371 return dst_mtu(dst->path);
2374 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2376 struct net *net;
2377 int err = 0;
2378 if (unlikely(afinfo == NULL))
2379 return -EINVAL;
2380 if (unlikely(afinfo->family >= NPROTO))
2381 return -EAFNOSUPPORT;
2382 write_lock_bh(&xfrm_policy_afinfo_lock);
2383 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2384 err = -ENOBUFS;
2385 else {
2386 struct dst_ops *dst_ops = afinfo->dst_ops;
2387 if (likely(dst_ops->kmem_cachep == NULL))
2388 dst_ops->kmem_cachep = xfrm_dst_cache;
2389 if (likely(dst_ops->check == NULL))
2390 dst_ops->check = xfrm_dst_check;
2391 if (likely(dst_ops->default_advmss == NULL))
2392 dst_ops->default_advmss = xfrm_default_advmss;
2393 if (likely(dst_ops->default_mtu == NULL))
2394 dst_ops->default_mtu = xfrm_default_mtu;
2395 if (likely(dst_ops->negative_advice == NULL))
2396 dst_ops->negative_advice = xfrm_negative_advice;
2397 if (likely(dst_ops->link_failure == NULL))
2398 dst_ops->link_failure = xfrm_link_failure;
2399 if (likely(afinfo->garbage_collect == NULL))
2400 afinfo->garbage_collect = __xfrm_garbage_collect;
2401 xfrm_policy_afinfo[afinfo->family] = afinfo;
2403 write_unlock_bh(&xfrm_policy_afinfo_lock);
2405 rtnl_lock();
2406 for_each_net(net) {
2407 struct dst_ops *xfrm_dst_ops;
2409 switch (afinfo->family) {
2410 case AF_INET:
2411 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2412 break;
2413 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2414 case AF_INET6:
2415 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2416 break;
2417 #endif
2418 default:
2419 BUG();
2421 *xfrm_dst_ops = *afinfo->dst_ops;
2423 rtnl_unlock();
2425 return err;
2427 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2429 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2431 int err = 0;
2432 if (unlikely(afinfo == NULL))
2433 return -EINVAL;
2434 if (unlikely(afinfo->family >= NPROTO))
2435 return -EAFNOSUPPORT;
2436 write_lock_bh(&xfrm_policy_afinfo_lock);
2437 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2438 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2439 err = -EINVAL;
2440 else {
2441 struct dst_ops *dst_ops = afinfo->dst_ops;
2442 xfrm_policy_afinfo[afinfo->family] = NULL;
2443 dst_ops->kmem_cachep = NULL;
2444 dst_ops->check = NULL;
2445 dst_ops->negative_advice = NULL;
2446 dst_ops->link_failure = NULL;
2447 afinfo->garbage_collect = NULL;
2450 write_unlock_bh(&xfrm_policy_afinfo_lock);
2451 return err;
2453 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2455 static void __net_init xfrm_dst_ops_init(struct net *net)
2457 struct xfrm_policy_afinfo *afinfo;
2459 read_lock_bh(&xfrm_policy_afinfo_lock);
2460 afinfo = xfrm_policy_afinfo[AF_INET];
2461 if (afinfo)
2462 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2463 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2464 afinfo = xfrm_policy_afinfo[AF_INET6];
2465 if (afinfo)
2466 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2467 #endif
2468 read_unlock_bh(&xfrm_policy_afinfo_lock);
2471 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2473 struct xfrm_policy_afinfo *afinfo;
2474 if (unlikely(family >= NPROTO))
2475 return NULL;
2476 read_lock(&xfrm_policy_afinfo_lock);
2477 afinfo = xfrm_policy_afinfo[family];
2478 if (unlikely(!afinfo))
2479 read_unlock(&xfrm_policy_afinfo_lock);
2480 return afinfo;
2483 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2485 read_unlock(&xfrm_policy_afinfo_lock);
2488 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2490 struct net_device *dev = ptr;
2492 switch (event) {
2493 case NETDEV_DOWN:
2494 __xfrm_garbage_collect(dev_net(dev));
2496 return NOTIFY_DONE;
2499 static struct notifier_block xfrm_dev_notifier = {
2500 .notifier_call = xfrm_dev_event,
2503 #ifdef CONFIG_XFRM_STATISTICS
2504 static int __net_init xfrm_statistics_init(struct net *net)
2506 int rv;
2508 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2509 sizeof(struct linux_xfrm_mib),
2510 __alignof__(struct linux_xfrm_mib)) < 0)
2511 return -ENOMEM;
2512 rv = xfrm_proc_init(net);
2513 if (rv < 0)
2514 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2515 return rv;
2518 static void xfrm_statistics_fini(struct net *net)
2520 xfrm_proc_fini(net);
2521 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2523 #else
2524 static int __net_init xfrm_statistics_init(struct net *net)
2526 return 0;
2529 static void xfrm_statistics_fini(struct net *net)
2532 #endif
2534 static int __net_init xfrm_policy_init(struct net *net)
2536 unsigned int hmask, sz;
2537 int dir;
2539 if (net_eq(net, &init_net))
2540 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2541 sizeof(struct xfrm_dst),
2542 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2543 NULL);
2545 hmask = 8 - 1;
2546 sz = (hmask+1) * sizeof(struct hlist_head);
2548 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2549 if (!net->xfrm.policy_byidx)
2550 goto out_byidx;
2551 net->xfrm.policy_idx_hmask = hmask;
2553 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2554 struct xfrm_policy_hash *htab;
2556 net->xfrm.policy_count[dir] = 0;
2557 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2559 htab = &net->xfrm.policy_bydst[dir];
2560 htab->table = xfrm_hash_alloc(sz);
2561 if (!htab->table)
2562 goto out_bydst;
2563 htab->hmask = hmask;
2566 INIT_LIST_HEAD(&net->xfrm.policy_all);
2567 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2568 if (net_eq(net, &init_net))
2569 register_netdevice_notifier(&xfrm_dev_notifier);
2570 return 0;
2572 out_bydst:
2573 for (dir--; dir >= 0; dir--) {
2574 struct xfrm_policy_hash *htab;
2576 htab = &net->xfrm.policy_bydst[dir];
2577 xfrm_hash_free(htab->table, sz);
2579 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2580 out_byidx:
2581 return -ENOMEM;
2584 static void xfrm_policy_fini(struct net *net)
2586 struct xfrm_audit audit_info;
2587 unsigned int sz;
2588 int dir;
2590 flush_work(&net->xfrm.policy_hash_work);
2591 #ifdef CONFIG_XFRM_SUB_POLICY
2592 audit_info.loginuid = -1;
2593 audit_info.sessionid = -1;
2594 audit_info.secid = 0;
2595 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2596 #endif
2597 audit_info.loginuid = -1;
2598 audit_info.sessionid = -1;
2599 audit_info.secid = 0;
2600 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2602 WARN_ON(!list_empty(&net->xfrm.policy_all));
2604 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2605 struct xfrm_policy_hash *htab;
2607 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2609 htab = &net->xfrm.policy_bydst[dir];
2610 sz = (htab->hmask + 1);
2611 WARN_ON(!hlist_empty(htab->table));
2612 xfrm_hash_free(htab->table, sz);
2615 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2616 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2617 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2620 static int __net_init xfrm_net_init(struct net *net)
2622 int rv;
2624 rv = xfrm_statistics_init(net);
2625 if (rv < 0)
2626 goto out_statistics;
2627 rv = xfrm_state_init(net);
2628 if (rv < 0)
2629 goto out_state;
2630 rv = xfrm_policy_init(net);
2631 if (rv < 0)
2632 goto out_policy;
2633 xfrm_dst_ops_init(net);
2634 rv = xfrm_sysctl_init(net);
2635 if (rv < 0)
2636 goto out_sysctl;
2637 return 0;
2639 out_sysctl:
2640 xfrm_policy_fini(net);
2641 out_policy:
2642 xfrm_state_fini(net);
2643 out_state:
2644 xfrm_statistics_fini(net);
2645 out_statistics:
2646 return rv;
2649 static void __net_exit xfrm_net_exit(struct net *net)
2651 xfrm_sysctl_fini(net);
2652 xfrm_policy_fini(net);
2653 xfrm_state_fini(net);
2654 xfrm_statistics_fini(net);
2657 static struct pernet_operations __net_initdata xfrm_net_ops = {
2658 .init = xfrm_net_init,
2659 .exit = xfrm_net_exit,
2662 void __init xfrm_init(void)
2664 register_pernet_subsys(&xfrm_net_ops);
2665 xfrm_input_init();
2668 #ifdef CONFIG_AUDITSYSCALL
2669 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2670 struct audit_buffer *audit_buf)
2672 struct xfrm_sec_ctx *ctx = xp->security;
2673 struct xfrm_selector *sel = &xp->selector;
2675 if (ctx)
2676 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2677 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2679 switch(sel->family) {
2680 case AF_INET:
2681 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2682 if (sel->prefixlen_s != 32)
2683 audit_log_format(audit_buf, " src_prefixlen=%d",
2684 sel->prefixlen_s);
2685 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2686 if (sel->prefixlen_d != 32)
2687 audit_log_format(audit_buf, " dst_prefixlen=%d",
2688 sel->prefixlen_d);
2689 break;
2690 case AF_INET6:
2691 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2692 if (sel->prefixlen_s != 128)
2693 audit_log_format(audit_buf, " src_prefixlen=%d",
2694 sel->prefixlen_s);
2695 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2696 if (sel->prefixlen_d != 128)
2697 audit_log_format(audit_buf, " dst_prefixlen=%d",
2698 sel->prefixlen_d);
2699 break;
2703 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2704 uid_t auid, u32 sessionid, u32 secid)
2706 struct audit_buffer *audit_buf;
2708 audit_buf = xfrm_audit_start("SPD-add");
2709 if (audit_buf == NULL)
2710 return;
2711 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2712 audit_log_format(audit_buf, " res=%u", result);
2713 xfrm_audit_common_policyinfo(xp, audit_buf);
2714 audit_log_end(audit_buf);
2716 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2718 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2719 uid_t auid, u32 sessionid, u32 secid)
2721 struct audit_buffer *audit_buf;
2723 audit_buf = xfrm_audit_start("SPD-delete");
2724 if (audit_buf == NULL)
2725 return;
2726 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2727 audit_log_format(audit_buf, " res=%u", result);
2728 xfrm_audit_common_policyinfo(xp, audit_buf);
2729 audit_log_end(audit_buf);
2731 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2732 #endif
2734 #ifdef CONFIG_XFRM_MIGRATE
2735 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2736 struct xfrm_selector *sel_tgt)
2738 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2739 if (sel_tgt->family == sel_cmp->family &&
2740 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2741 sel_cmp->family) == 0 &&
2742 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2743 sel_cmp->family) == 0 &&
2744 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2745 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2746 return 1;
2748 } else {
2749 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2750 return 1;
2753 return 0;
2756 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2757 u8 dir, u8 type)
2759 struct xfrm_policy *pol, *ret = NULL;
2760 struct hlist_node *entry;
2761 struct hlist_head *chain;
2762 u32 priority = ~0U;
2764 read_lock_bh(&xfrm_policy_lock);
2765 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2766 hlist_for_each_entry(pol, entry, chain, bydst) {
2767 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2768 pol->type == type) {
2769 ret = pol;
2770 priority = ret->priority;
2771 break;
2774 chain = &init_net.xfrm.policy_inexact[dir];
2775 hlist_for_each_entry(pol, entry, chain, bydst) {
2776 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2777 pol->type == type &&
2778 pol->priority < priority) {
2779 ret = pol;
2780 break;
2784 if (ret)
2785 xfrm_pol_hold(ret);
2787 read_unlock_bh(&xfrm_policy_lock);
2789 return ret;
2792 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2794 int match = 0;
2796 if (t->mode == m->mode && t->id.proto == m->proto &&
2797 (m->reqid == 0 || t->reqid == m->reqid)) {
2798 switch (t->mode) {
2799 case XFRM_MODE_TUNNEL:
2800 case XFRM_MODE_BEET:
2801 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2802 m->old_family) == 0 &&
2803 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2804 m->old_family) == 0) {
2805 match = 1;
2807 break;
2808 case XFRM_MODE_TRANSPORT:
2809 /* in case of transport mode, template does not store
2810 any IP addresses, hence we just compare mode and
2811 protocol */
2812 match = 1;
2813 break;
2814 default:
2815 break;
2818 return match;
2821 /* update endpoint address(es) of template(s) */
2822 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2823 struct xfrm_migrate *m, int num_migrate)
2825 struct xfrm_migrate *mp;
2826 int i, j, n = 0;
2828 write_lock_bh(&pol->lock);
2829 if (unlikely(pol->walk.dead)) {
2830 /* target policy has been deleted */
2831 write_unlock_bh(&pol->lock);
2832 return -ENOENT;
2835 for (i = 0; i < pol->xfrm_nr; i++) {
2836 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2837 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2838 continue;
2839 n++;
2840 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2841 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2842 continue;
2843 /* update endpoints */
2844 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2845 sizeof(pol->xfrm_vec[i].id.daddr));
2846 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2847 sizeof(pol->xfrm_vec[i].saddr));
2848 pol->xfrm_vec[i].encap_family = mp->new_family;
2849 /* flush bundles */
2850 atomic_inc(&pol->genid);
2854 write_unlock_bh(&pol->lock);
2856 if (!n)
2857 return -ENODATA;
2859 return 0;
2862 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2864 int i, j;
2866 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2867 return -EINVAL;
2869 for (i = 0; i < num_migrate; i++) {
2870 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2871 m[i].old_family) == 0) &&
2872 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2873 m[i].old_family) == 0))
2874 return -EINVAL;
2875 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2876 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2877 return -EINVAL;
2879 /* check if there is any duplicated entry */
2880 for (j = i + 1; j < num_migrate; j++) {
2881 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2882 sizeof(m[i].old_daddr)) &&
2883 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2884 sizeof(m[i].old_saddr)) &&
2885 m[i].proto == m[j].proto &&
2886 m[i].mode == m[j].mode &&
2887 m[i].reqid == m[j].reqid &&
2888 m[i].old_family == m[j].old_family)
2889 return -EINVAL;
2893 return 0;
2896 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2897 struct xfrm_migrate *m, int num_migrate,
2898 struct xfrm_kmaddress *k)
2900 int i, err, nx_cur = 0, nx_new = 0;
2901 struct xfrm_policy *pol = NULL;
2902 struct xfrm_state *x, *xc;
2903 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2904 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2905 struct xfrm_migrate *mp;
2907 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2908 goto out;
2910 /* Stage 1 - find policy */
2911 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2912 err = -ENOENT;
2913 goto out;
2916 /* Stage 2 - find and update state(s) */
2917 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2918 if ((x = xfrm_migrate_state_find(mp))) {
2919 x_cur[nx_cur] = x;
2920 nx_cur++;
2921 if ((xc = xfrm_state_migrate(x, mp))) {
2922 x_new[nx_new] = xc;
2923 nx_new++;
2924 } else {
2925 err = -ENODATA;
2926 goto restore_state;
2931 /* Stage 3 - update policy */
2932 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2933 goto restore_state;
2935 /* Stage 4 - delete old state(s) */
2936 if (nx_cur) {
2937 xfrm_states_put(x_cur, nx_cur);
2938 xfrm_states_delete(x_cur, nx_cur);
2941 /* Stage 5 - announce */
2942 km_migrate(sel, dir, type, m, num_migrate, k);
2944 xfrm_pol_put(pol);
2946 return 0;
2947 out:
2948 return err;
2950 restore_state:
2951 if (pol)
2952 xfrm_pol_put(pol);
2953 if (nx_cur)
2954 xfrm_states_put(x_cur, nx_cur);
2955 if (nx_new)
2956 xfrm_states_delete(x_new, nx_new);
2958 return err;
2960 EXPORT_SYMBOL(xfrm_migrate);
2961 #endif