6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * Kazunori MIYAZAWA @USAGI
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>
31 #ifdef CONFIG_XFRM_STATISTICS
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,
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);
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)
87 return __xfrm4_selector_match(sel, fl);
89 return __xfrm6_selector_match(sel, fl);
94 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
95 xfrm_address_t *saddr,
96 xfrm_address_t *daddr,
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);
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,
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) {
127 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
132 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
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));
144 static inline unsigned long make_jiffies(long secs)
146 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
147 return MAX_SCHEDULE_TIMEOUT-1;
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;
160 read_lock(&xp->lock);
162 if (unlikely(xp->walk.dead))
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;
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;
183 if (xp->lft.soft_add_expires_seconds) {
184 long tmo = xp->lft.soft_add_expires_seconds +
185 xp->curlft.add_time - now;
188 tmo = XFRM_KM_TIMEOUT;
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;
198 tmo = XFRM_KM_TIMEOUT;
205 km_policy_expired(xp, dir, 0, 0);
206 if (next != LONG_MAX &&
207 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
211 read_unlock(&xp->lock);
216 read_unlock(&xp->lock);
217 if (!xfrm_policy_delete(xp, dir))
218 km_policy_expired(xp, dir, 1, 0);
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))
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
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);
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;
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))
286 security_xfrm_policy_free(policy->security);
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;
341 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
344 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
345 pol->family, nhashmask);
348 hlist_add_head(&pol->bydst, ndsttable+h);
354 hlist_add_after(entry0, &pol->bydst);
358 if (!hlist_empty(list)) {
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) {
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);
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);
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;
442 if ((hmask + 1) < xfrm_policy_hashmax &&
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 &&
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);
481 mutex_lock(&hash_resize_mutex);
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;
501 struct hlist_node *entry;
502 struct hlist_head *list;
503 struct xfrm_policy *p;
507 idx = (idx_generator | dir);
511 list = net->xfrm.policy_byidx + idx_hash(net, idx);
513 hlist_for_each_entry(p, entry, list, byidx) {
514 if (p->index == 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);
531 for (i = 0; i < len; i++) {
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);
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) &&
559 write_unlock_bh(&xfrm_policy_lock);
563 if (policy->priority > pol->priority)
565 } else if (policy->priority >= pol->priority) {
566 newpos = &pol->bydst;
573 hlist_add_after(newpos, &policy->bydst);
575 hlist_add_head(&policy->bydst, chain);
576 xfrm_pol_hold(policy);
577 net->xfrm.policy_count[dir]++;
578 atomic_inc(&flow_cache_genid);
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);
591 xfrm_policy_kill(delpol);
592 else if (xfrm_bydst_should_resize(net, dir, NULL))
593 schedule_work(&net->xfrm.policy_hash_work);
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,
604 struct xfrm_policy *pol, *ret;
605 struct hlist_head *chain;
606 struct hlist_node *entry;
609 write_lock_bh(&xfrm_policy_lock);
610 chain = policy_hash_bysel(net, sel, sel->family, dir);
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)) {
619 *err = security_xfrm_policy_delete(
622 write_unlock_bh(&xfrm_policy_lock);
625 __xfrm_policy_unlink(pol, dir);
631 write_unlock_bh(&xfrm_policy_lock);
634 xfrm_policy_kill(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;
647 if (xfrm_policy_id2dir(id) != dir)
651 write_lock_bh(&xfrm_policy_lock);
652 chain = net->xfrm.policy_byidx + idx_hash(net, id);
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) {
659 *err = security_xfrm_policy_delete(
662 write_unlock_bh(&xfrm_policy_lock);
665 __xfrm_policy_unlink(pol, dir);
671 write_unlock_bh(&xfrm_policy_lock);
674 xfrm_policy_kill(ret);
677 EXPORT_SYMBOL(xfrm_policy_byid);
679 #ifdef CONFIG_SECURITY_NETWORK_XFRM
681 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
685 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
686 struct xfrm_policy *pol;
687 struct hlist_node *entry;
690 hlist_for_each_entry(pol, entry,
691 &net->xfrm.policy_inexact[dir], bydst) {
692 if (pol->type != type)
694 err = security_xfrm_policy_delete(pol->security);
696 xfrm_audit_policy_delete(pol, 0,
697 audit_info->loginuid,
698 audit_info->sessionid,
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,
707 if (pol->type != type)
709 err = security_xfrm_policy_delete(
712 xfrm_audit_policy_delete(pol, 0,
713 audit_info->loginuid,
714 audit_info->sessionid,
725 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
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);
741 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
742 struct xfrm_policy *pol;
743 struct hlist_node *entry;
747 hlist_for_each_entry(pol, entry,
748 &net->xfrm.policy_inexact[dir], bydst) {
749 if (pol->type != type)
751 __xfrm_policy_unlink(pol, dir);
752 write_unlock_bh(&xfrm_policy_lock);
755 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
756 audit_info->sessionid,
759 xfrm_policy_kill(pol);
761 write_lock_bh(&xfrm_policy_lock);
765 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
767 hlist_for_each_entry(pol, entry,
768 net->xfrm.policy_bydst[dir].table + i,
770 if (pol->type != type)
772 __xfrm_policy_unlink(pol, dir);
773 write_unlock_bh(&xfrm_policy_lock);
776 xfrm_audit_policy_delete(pol, 1,
777 audit_info->loginuid,
778 audit_info->sessionid,
780 xfrm_policy_kill(pol);
782 write_lock_bh(&xfrm_policy_lock);
791 write_unlock_bh(&xfrm_policy_lock);
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*),
800 struct xfrm_policy *pol;
801 struct xfrm_policy_walk_entry *x;
804 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
805 walk->type != XFRM_POLICY_TYPE_ANY)
808 if (list_empty(&walk->walk.all) && walk->seq != 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);
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) {
819 pol = container_of(x, struct xfrm_policy, walk);
820 if (walk->type != XFRM_POLICY_TYPE_ANY &&
821 walk->type != pol->type)
823 error = func(pol, xfrm_policy_id2dir(pol->index),
826 list_move_tail(&walk->walk.all, &x->all);
831 if (walk->seq == 0) {
835 list_del_init(&walk->walk.all);
837 write_unlock_bh(&xfrm_policy_lock);
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);
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))
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 ||
878 match = xfrm_selector_match(sel, fl, family);
880 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
886 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
891 struct xfrm_policy *pol, *ret;
892 xfrm_address_t *daddr, *saddr;
893 struct hlist_node *entry;
894 struct hlist_head *chain;
897 daddr = xfrm_flowi_daddr(fl, family);
898 saddr = xfrm_flowi_saddr(fl, family);
899 if (unlikely(!daddr || !saddr))
902 read_lock_bh(&xfrm_policy_lock);
903 chain = policy_hash_direct(net, daddr, saddr, family, dir);
905 hlist_for_each_entry(pol, entry, chain, bydst) {
906 err = xfrm_policy_match(pol, fl, type, family, dir);
916 priority = ret->priority;
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);
930 } else if (pol->priority < priority) {
938 read_unlock_bh(&xfrm_policy_lock);
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);
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;
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() */
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)
986 case XFRM_POLICY_OUT:
988 case XFRM_POLICY_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,
1004 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1008 err = security_xfrm_policy_lookup(pol->security,
1010 policy_to_flow_dir(dir));
1013 else if (err == -ESRCH)
1021 read_unlock_bh(&xfrm_policy_lock);
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,
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]++;
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,
1044 struct net *net = xp_net(pol);
1046 if (hlist_unhashed(&pol->bydst))
1049 hlist_del(&pol->bydst);
1050 hlist_del(&pol->byidx);
1051 list_del(&pol->walk.all);
1052 net->xfrm.policy_count[dir]--;
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);
1063 xfrm_policy_kill(pol);
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)
1080 write_lock_bh(&xfrm_policy_lock);
1081 old_pol = sk->sk_policy[dir];
1082 sk->sk_policy[dir] = 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);
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);
1096 xfrm_policy_kill(old_pol);
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);
1106 newp->selector = old->selector;
1107 if (security_xfrm_policy_clone(old->security,
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);
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)
1138 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1144 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1145 unsigned short family)
1148 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1150 if (unlikely(afinfo == NULL))
1152 err = afinfo->get_saddr(net, local, remote);
1153 xfrm_policy_put_afinfo(afinfo);
1157 /* Resolve list of templates for the flow, given policy. */
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);
1167 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1168 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
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);
1189 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1191 if (x && x->km.state == XFRM_STATE_VALID) {
1198 error = (x->km.state == XFRM_STATE_ERROR ?
1202 else if (error == -ESRCH)
1205 if (!tmpl->optional)
1211 for (nx--; nx>=0; nx--)
1212 xfrm_state_put(xfrm[nx]);
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;
1228 for (i = 0; i < npols; i++) {
1229 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1234 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1242 /* found states are sorted for outbound processing */
1244 xfrm_state_sort(xfrm, tpp, cnx, family);
1249 for (cnx--; cnx>=0; cnx--)
1250 xfrm_state_put(tpp[cnx]);
1255 /* Check that the bundle accepts the flow and its components are
1259 static inline int xfrm_get_tos(struct flowi *fl, int family)
1261 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1267 tos = afinfo->get_tos(fl);
1269 xfrm_policy_put_afinfo(afinfo);
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)
1287 if (stale_bundle(dst))
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;
1302 if (stale_bundle(dst))
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;
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;
1329 return ERR_PTR(-EINVAL);
1333 dst_ops = &net->xfrm.xfrm4_dst_ops;
1335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1337 dst_ops = &net->xfrm.xfrm6_dst_ops;
1343 xdst = dst_alloc(dst_ops);
1344 xfrm_policy_put_afinfo(afinfo);
1347 xdst->flo.ops = &xfrm_bundle_fc_ops;
1349 xdst = ERR_PTR(-ENOBUFS);
1354 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1357 struct xfrm_policy_afinfo *afinfo =
1358 xfrm_policy_get_afinfo(dst->ops->family);
1364 err = afinfo->init_path(path, dst, nfheader_len);
1366 xfrm_policy_put_afinfo(afinfo);
1371 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1374 struct xfrm_policy_afinfo *afinfo =
1375 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1381 err = afinfo->fill_dst(xdst, dev, fl);
1383 xfrm_policy_put_afinfo(afinfo);
1389 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1390 * all the metrics... Shortly, bundle a bundle.
1393 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1394 struct xfrm_state **xfrm, int nx,
1396 struct dst_entry *dst)
1398 struct net *net = xp_net(policy);
1399 unsigned long now = jiffies;
1400 struct net_device *dev;
1401 struct dst_entry *dst_prev = NULL;
1402 struct dst_entry *dst0 = NULL;
1406 int nfheader_len = 0;
1407 int trailer_len = 0;
1409 int family = policy->selector.family;
1410 xfrm_address_t saddr, daddr;
1412 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1414 tos = xfrm_get_tos(fl, family);
1421 for (; i < nx; i++) {
1422 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1423 struct dst_entry *dst1 = &xdst->u.dst;
1425 err = PTR_ERR(xdst);
1434 dst_prev->child = dst_clone(dst1);
1435 dst1->flags |= DST_NOHASH;
1439 dst_copy_metrics(dst1, dst);
1441 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1442 family = xfrm[i]->props.family;
1443 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1451 dst1->xfrm = xfrm[i];
1452 xdst->xfrm_genid = xfrm[i]->genid;
1454 dst1->obsolete = -1;
1455 dst1->flags |= DST_HOST;
1456 dst1->lastuse = now;
1458 dst1->input = dst_discard;
1459 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1461 dst1->next = dst_prev;
1464 header_len += xfrm[i]->props.header_len;
1465 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1466 nfheader_len += xfrm[i]->props.header_len;
1467 trailer_len += xfrm[i]->props.trailer_len;
1470 dst_prev->child = dst;
1478 /* Copy neighbour for reachability confirmation */
1479 dst0->neighbour = neigh_clone(dst->neighbour);
1481 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1482 xfrm_init_pmtu(dst_prev);
1484 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1485 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1487 err = xfrm_fill_dst(xdst, dev, fl);
1491 dst_prev->header_len = header_len;
1492 dst_prev->trailer_len = trailer_len;
1493 header_len -= xdst->u.dst.xfrm->props.header_len;
1494 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1502 xfrm_state_put(xfrm[i]);
1506 dst0 = ERR_PTR(err);
1511 xfrm_dst_alloc_copy(void **target, void *src, int size)
1514 *target = kmalloc(size, GFP_ATOMIC);
1518 memcpy(*target, src, size);
1523 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1525 #ifdef CONFIG_XFRM_SUB_POLICY
1526 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1527 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1535 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1537 #ifdef CONFIG_XFRM_SUB_POLICY
1538 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1539 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1545 static int xfrm_expand_policies(struct flowi *fl, u16 family,
1546 struct xfrm_policy **pols,
1547 int *num_pols, int *num_xfrms)
1551 if (*num_pols == 0 || !pols[0]) {
1556 if (IS_ERR(pols[0]))
1557 return PTR_ERR(pols[0]);
1559 *num_xfrms = pols[0]->xfrm_nr;
1561 #ifdef CONFIG_XFRM_SUB_POLICY
1562 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1563 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1564 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1565 XFRM_POLICY_TYPE_MAIN,
1569 if (IS_ERR(pols[1])) {
1570 xfrm_pols_put(pols, *num_pols);
1571 return PTR_ERR(pols[1]);
1574 (*num_xfrms) += pols[1]->xfrm_nr;
1578 for (i = 0; i < *num_pols; i++) {
1579 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1589 static struct xfrm_dst *
1590 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1591 struct flowi *fl, u16 family,
1592 struct dst_entry *dst_orig)
1594 struct net *net = xp_net(pols[0]);
1595 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1596 struct dst_entry *dst;
1597 struct xfrm_dst *xdst;
1600 /* Try to instantiate a bundle */
1601 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1603 if (err != 0 && err != -EAGAIN)
1604 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1605 return ERR_PTR(err);
1608 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1610 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1611 return ERR_CAST(dst);
1614 xdst = (struct xfrm_dst *)dst;
1615 xdst->num_xfrms = err;
1617 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1619 err = xfrm_dst_update_origin(dst, fl);
1620 if (unlikely(err)) {
1622 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1623 return ERR_PTR(err);
1626 xdst->num_pols = num_pols;
1627 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1628 xdst->policy_genid = atomic_read(&pols[0]->genid);
1633 static struct flow_cache_object *
1634 xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1635 struct flow_cache_object *oldflo, void *ctx)
1637 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1638 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1639 struct xfrm_dst *xdst, *new_xdst;
1640 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1642 /* Check if the policies from old bundle are usable */
1645 xdst = container_of(oldflo, struct xfrm_dst, flo);
1646 num_pols = xdst->num_pols;
1647 num_xfrms = xdst->num_xfrms;
1649 for (i = 0; i < num_pols; i++) {
1650 pols[i] = xdst->pols[i];
1651 pol_dead |= pols[i]->walk.dead;
1654 dst_free(&xdst->u.dst);
1662 /* Resolve policies to use if we couldn't get them from
1663 * previous cache entry */
1666 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1667 err = xfrm_expand_policies(fl, family, pols,
1668 &num_pols, &num_xfrms);
1674 goto make_dummy_bundle;
1677 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1678 if (IS_ERR(new_xdst)) {
1679 err = PTR_ERR(new_xdst);
1683 goto make_dummy_bundle;
1684 dst_hold(&xdst->u.dst);
1686 } else if (new_xdst == NULL) {
1689 goto make_dummy_bundle;
1690 xdst->num_xfrms = 0;
1691 dst_hold(&xdst->u.dst);
1695 /* Kill the previous bundle */
1697 /* The policies were stolen for newly generated bundle */
1699 dst_free(&xdst->u.dst);
1702 /* Flow cache does not have reference, it dst_free()'s,
1703 * but we do need to return one reference for original caller */
1704 dst_hold(&new_xdst->u.dst);
1705 return &new_xdst->flo;
1708 /* We found policies, but there's no bundles to instantiate:
1709 * either because the policy blocks, has no transformations or
1710 * we could not build template (no xfrm_states).*/
1711 xdst = xfrm_alloc_dst(net, family);
1713 xfrm_pols_put(pols, num_pols);
1714 return ERR_CAST(xdst);
1716 xdst->num_pols = num_pols;
1717 xdst->num_xfrms = num_xfrms;
1718 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1720 dst_hold(&xdst->u.dst);
1724 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1727 dst_free(&xdst->u.dst);
1729 xfrm_pols_put(pols, num_pols);
1730 return ERR_PTR(err);
1733 /* Main function: finds/creates a bundle for given flow.
1735 * At the moment we eat a raw IP route. Mostly to speed up lookups
1736 * on interfaces with disabled IPsec.
1738 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1739 struct sock *sk, int flags)
1741 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1742 struct flow_cache_object *flo;
1743 struct xfrm_dst *xdst;
1744 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1745 u16 family = dst_orig->ops->family;
1746 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1747 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1754 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1756 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1757 err = xfrm_expand_policies(fl, family, pols,
1758 &num_pols, &num_xfrms);
1763 if (num_xfrms <= 0) {
1764 drop_pols = num_pols;
1768 xdst = xfrm_resolve_and_create_bundle(
1772 xfrm_pols_put(pols, num_pols);
1773 err = PTR_ERR(xdst);
1775 } else if (xdst == NULL) {
1777 drop_pols = num_pols;
1781 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1782 xdst->u.dst.next = xfrm_policy_sk_bundles;
1783 xfrm_policy_sk_bundles = &xdst->u.dst;
1784 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1786 route = xdst->route;
1791 /* To accelerate a bit... */
1792 if ((dst_orig->flags & DST_NOXFRM) ||
1793 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1796 flo = flow_cache_lookup(net, fl, family, dir,
1797 xfrm_bundle_lookup, dst_orig);
1804 xdst = container_of(flo, struct xfrm_dst, flo);
1806 num_pols = xdst->num_pols;
1807 num_xfrms = xdst->num_xfrms;
1808 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1809 route = xdst->route;
1813 if (route == NULL && num_xfrms > 0) {
1814 /* The only case when xfrm_bundle_lookup() returns a
1815 * bundle with null route, is when the template could
1816 * not be resolved. It means policies are there, but
1817 * bundle could not be created, since we don't yet
1818 * have the xfrm_state's. We need to wait for KM to
1819 * negotiate new SA's or bail out with error.*/
1820 if (net->xfrm.sysctl_larval_drop) {
1821 /* EREMOTE tells the caller to generate
1822 * a one-shot blackhole route. */
1824 xfrm_pols_put(pols, drop_pols);
1825 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1828 if (flags & XFRM_LOOKUP_WAIT) {
1829 DECLARE_WAITQUEUE(wait, current);
1831 add_wait_queue(&net->xfrm.km_waitq, &wait);
1832 set_current_state(TASK_INTERRUPTIBLE);
1834 set_current_state(TASK_RUNNING);
1835 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1837 if (!signal_pending(current)) {
1846 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1854 if ((flags & XFRM_LOOKUP_ICMP) &&
1855 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1860 for (i = 0; i < num_pols; i++)
1861 pols[i]->curlft.use_time = get_seconds();
1863 if (num_xfrms < 0) {
1864 /* Prohibit the flow */
1865 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1868 } else if (num_xfrms > 0) {
1869 /* Flow transformed */
1871 dst_release(dst_orig);
1873 /* Flow passes untransformed */
1877 xfrm_pols_put(pols, drop_pols);
1881 if (!(flags & XFRM_LOOKUP_ICMP))
1887 dst_release(dst_orig);
1889 xfrm_pols_put(pols, drop_pols);
1892 EXPORT_SYMBOL(__xfrm_lookup);
1894 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1895 struct sock *sk, int flags)
1897 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1899 if (err == -EREMOTE) {
1900 dst_release(*dst_p);
1907 EXPORT_SYMBOL(xfrm_lookup);
1910 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1912 struct xfrm_state *x;
1914 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1916 x = skb->sp->xvec[idx];
1917 if (!x->type->reject)
1919 return x->type->reject(x, skb, fl);
1922 /* When skb is transformed back to its "native" form, we have to
1923 * check policy restrictions. At the moment we make this in maximally
1924 * stupid way. Shame on me. :-) Of course, connected sockets must
1925 * have policy cached at them.
1929 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1930 unsigned short family)
1932 if (xfrm_state_kern(x))
1933 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1934 return x->id.proto == tmpl->id.proto &&
1935 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1936 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1937 x->props.mode == tmpl->mode &&
1938 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1939 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1940 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1941 xfrm_state_addr_cmp(tmpl, x, family));
1945 * 0 or more than 0 is returned when validation is succeeded (either bypass
1946 * because of optional transport mode, or next index of the mathced secpath
1947 * state with the template.
1948 * -1 is returned when no matching template is found.
1949 * Otherwise "-2 - errored_index" is returned.
1952 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1953 unsigned short family)
1957 if (tmpl->optional) {
1958 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1962 for (; idx < sp->len; idx++) {
1963 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1965 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1974 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1975 unsigned int family, int reverse)
1977 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1980 if (unlikely(afinfo == NULL))
1981 return -EAFNOSUPPORT;
1983 afinfo->decode_session(skb, fl, reverse);
1984 err = security_xfrm_decode_session(skb, &fl->secid);
1985 xfrm_policy_put_afinfo(afinfo);
1988 EXPORT_SYMBOL(__xfrm_decode_session);
1990 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1992 for (; k < sp->len; k++) {
1993 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2002 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2003 unsigned short family)
2005 struct net *net = dev_net(skb->dev);
2006 struct xfrm_policy *pol;
2007 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2016 reverse = dir & ~XFRM_POLICY_MASK;
2017 dir &= XFRM_POLICY_MASK;
2018 fl_dir = policy_to_flow_dir(dir);
2020 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2021 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2025 nf_nat_decode_session(skb, &fl, family);
2027 /* First, check used SA against their selectors. */
2031 for (i=skb->sp->len-1; i>=0; i--) {
2032 struct xfrm_state *x = skb->sp->xvec[i];
2033 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2034 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2041 if (sk && sk->sk_policy[dir]) {
2042 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2044 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2050 struct flow_cache_object *flo;
2052 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2053 xfrm_policy_lookup, NULL);
2054 if (IS_ERR_OR_NULL(flo))
2055 pol = ERR_CAST(flo);
2057 pol = container_of(flo, struct xfrm_policy, flo);
2061 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2066 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2067 xfrm_secpath_reject(xerr_idx, skb, &fl);
2068 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2074 pol->curlft.use_time = get_seconds();
2078 #ifdef CONFIG_XFRM_SUB_POLICY
2079 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2080 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2084 if (IS_ERR(pols[1])) {
2085 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2088 pols[1]->curlft.use_time = get_seconds();
2094 if (pol->action == XFRM_POLICY_ALLOW) {
2095 struct sec_path *sp;
2096 static struct sec_path dummy;
2097 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2098 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2099 struct xfrm_tmpl **tpp = tp;
2103 if ((sp = skb->sp) == NULL)
2106 for (pi = 0; pi < npols; pi++) {
2107 if (pols[pi] != pol &&
2108 pols[pi]->action != XFRM_POLICY_ALLOW) {
2109 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2112 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2113 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2116 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2117 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2121 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2125 /* For each tunnel xfrm, find the first matching tmpl.
2126 * For each tmpl before that, find corresponding xfrm.
2127 * Order is _important_. Later we will implement
2128 * some barriers, but at the moment barriers
2129 * are implied between each two transformations.
2131 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2132 k = xfrm_policy_ok(tpp[i], sp, k, family);
2135 /* "-2 - errored_index" returned */
2137 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2142 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2143 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2147 xfrm_pols_put(pols, npols);
2150 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2153 xfrm_secpath_reject(xerr_idx, skb, &fl);
2155 xfrm_pols_put(pols, npols);
2158 EXPORT_SYMBOL(__xfrm_policy_check);
2160 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2162 struct net *net = dev_net(skb->dev);
2164 struct dst_entry *dst;
2167 if (xfrm_decode_session(skb, &fl, family) < 0) {
2168 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2175 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2176 skb_dst_set(skb, dst);
2179 EXPORT_SYMBOL(__xfrm_route_forward);
2181 /* Optimize later using cookies and generation ids. */
2183 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2185 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2186 * to "-1" to force all XFRM destinations to get validated by
2187 * dst_ops->check on every use. We do this because when a
2188 * normal route referenced by an XFRM dst is obsoleted we do
2189 * not go looking around for all parent referencing XFRM dsts
2190 * so that we can invalidate them. It is just too much work.
2191 * Instead we make the checks here on every use. For example:
2193 * XFRM dst A --> IPv4 dst X
2195 * X is the "xdst->route" of A (X is also the "dst->path" of A
2196 * in this example). If X is marked obsolete, "A" will not
2197 * notice. That's what we are validating here via the
2198 * stale_bundle() check.
2200 * When a policy's bundle is pruned, we dst_free() the XFRM
2201 * dst which causes it's ->obsolete field to be set to a
2202 * positive non-zero integer. If an XFRM dst has been pruned
2203 * like this, we want to force a new route lookup.
2205 if (dst->obsolete < 0 && !stale_bundle(dst))
2211 static int stale_bundle(struct dst_entry *dst)
2213 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2216 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2218 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2219 dst->dev = dev_net(dev)->loopback_dev;
2224 EXPORT_SYMBOL(xfrm_dst_ifdown);
2226 static void xfrm_link_failure(struct sk_buff *skb)
2228 /* Impossible. Such dst must be popped before reaches point of failure. */
2231 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2234 if (dst->obsolete) {
2242 static void __xfrm_garbage_collect(struct net *net)
2244 struct dst_entry *head, *next;
2248 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2249 head = xfrm_policy_sk_bundles;
2250 xfrm_policy_sk_bundles = NULL;
2251 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2260 static void xfrm_init_pmtu(struct dst_entry *dst)
2263 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2264 u32 pmtu, route_mtu_cached;
2266 pmtu = dst_mtu(dst->child);
2267 xdst->child_mtu_cached = pmtu;
2269 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2271 route_mtu_cached = dst_mtu(xdst->route);
2272 xdst->route_mtu_cached = route_mtu_cached;
2274 if (pmtu > route_mtu_cached)
2275 pmtu = route_mtu_cached;
2277 dst_metric_set(dst, RTAX_MTU, pmtu);
2278 } while ((dst = dst->next));
2281 /* Check that the bundle accepts the flow and its components are
2285 static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2286 struct flowi *fl, int family, int strict)
2288 struct dst_entry *dst = &first->u.dst;
2289 struct xfrm_dst *last;
2292 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2293 (dst->dev && !netif_running(dst->dev)))
2295 #ifdef CONFIG_XFRM_SUB_POLICY
2297 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2299 if (first->partner &&
2300 !xfrm_selector_match(first->partner, fl, family))
2308 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2310 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2313 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2315 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2317 if (xdst->xfrm_genid != dst->xfrm->genid)
2319 if (xdst->num_pols > 0 &&
2320 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2324 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2325 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2328 mtu = dst_mtu(dst->child);
2329 if (xdst->child_mtu_cached != mtu) {
2331 xdst->child_mtu_cached = mtu;
2334 if (!dst_check(xdst->route, xdst->route_cookie))
2336 mtu = dst_mtu(xdst->route);
2337 if (xdst->route_mtu_cached != mtu) {
2339 xdst->route_mtu_cached = mtu;
2343 } while (dst->xfrm);
2348 mtu = last->child_mtu_cached;
2352 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2353 if (mtu > last->route_mtu_cached)
2354 mtu = last->route_mtu_cached;
2355 dst_metric_set(dst, RTAX_MTU, mtu);
2360 last = (struct xfrm_dst *)last->u.dst.next;
2361 last->child_mtu_cached = mtu;
2367 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2369 return dst_metric_advmss(dst->path);
2372 static unsigned int xfrm_default_mtu(const struct dst_entry *dst)
2374 return dst_mtu(dst->path);
2377 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2381 if (unlikely(afinfo == NULL))
2383 if (unlikely(afinfo->family >= NPROTO))
2384 return -EAFNOSUPPORT;
2385 write_lock_bh(&xfrm_policy_afinfo_lock);
2386 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2389 struct dst_ops *dst_ops = afinfo->dst_ops;
2390 if (likely(dst_ops->kmem_cachep == NULL))
2391 dst_ops->kmem_cachep = xfrm_dst_cache;
2392 if (likely(dst_ops->check == NULL))
2393 dst_ops->check = xfrm_dst_check;
2394 if (likely(dst_ops->default_advmss == NULL))
2395 dst_ops->default_advmss = xfrm_default_advmss;
2396 if (likely(dst_ops->default_mtu == NULL))
2397 dst_ops->default_mtu = xfrm_default_mtu;
2398 if (likely(dst_ops->negative_advice == NULL))
2399 dst_ops->negative_advice = xfrm_negative_advice;
2400 if (likely(dst_ops->link_failure == NULL))
2401 dst_ops->link_failure = xfrm_link_failure;
2402 if (likely(afinfo->garbage_collect == NULL))
2403 afinfo->garbage_collect = __xfrm_garbage_collect;
2404 xfrm_policy_afinfo[afinfo->family] = afinfo;
2406 write_unlock_bh(&xfrm_policy_afinfo_lock);
2410 struct dst_ops *xfrm_dst_ops;
2412 switch (afinfo->family) {
2414 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2416 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2418 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2424 *xfrm_dst_ops = *afinfo->dst_ops;
2430 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2432 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2435 if (unlikely(afinfo == NULL))
2437 if (unlikely(afinfo->family >= NPROTO))
2438 return -EAFNOSUPPORT;
2439 write_lock_bh(&xfrm_policy_afinfo_lock);
2440 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2441 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2444 struct dst_ops *dst_ops = afinfo->dst_ops;
2445 xfrm_policy_afinfo[afinfo->family] = NULL;
2446 dst_ops->kmem_cachep = NULL;
2447 dst_ops->check = NULL;
2448 dst_ops->negative_advice = NULL;
2449 dst_ops->link_failure = NULL;
2450 afinfo->garbage_collect = NULL;
2453 write_unlock_bh(&xfrm_policy_afinfo_lock);
2456 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2458 static void __net_init xfrm_dst_ops_init(struct net *net)
2460 struct xfrm_policy_afinfo *afinfo;
2462 read_lock_bh(&xfrm_policy_afinfo_lock);
2463 afinfo = xfrm_policy_afinfo[AF_INET];
2465 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2466 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2467 afinfo = xfrm_policy_afinfo[AF_INET6];
2469 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2471 read_unlock_bh(&xfrm_policy_afinfo_lock);
2474 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2476 struct xfrm_policy_afinfo *afinfo;
2477 if (unlikely(family >= NPROTO))
2479 read_lock(&xfrm_policy_afinfo_lock);
2480 afinfo = xfrm_policy_afinfo[family];
2481 if (unlikely(!afinfo))
2482 read_unlock(&xfrm_policy_afinfo_lock);
2486 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2488 read_unlock(&xfrm_policy_afinfo_lock);
2491 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2493 struct net_device *dev = ptr;
2497 __xfrm_garbage_collect(dev_net(dev));
2502 static struct notifier_block xfrm_dev_notifier = {
2503 .notifier_call = xfrm_dev_event,
2506 #ifdef CONFIG_XFRM_STATISTICS
2507 static int __net_init xfrm_statistics_init(struct net *net)
2511 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2512 sizeof(struct linux_xfrm_mib),
2513 __alignof__(struct linux_xfrm_mib)) < 0)
2515 rv = xfrm_proc_init(net);
2517 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2521 static void xfrm_statistics_fini(struct net *net)
2523 xfrm_proc_fini(net);
2524 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2527 static int __net_init xfrm_statistics_init(struct net *net)
2532 static void xfrm_statistics_fini(struct net *net)
2537 static int __net_init xfrm_policy_init(struct net *net)
2539 unsigned int hmask, sz;
2542 if (net_eq(net, &init_net))
2543 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2544 sizeof(struct xfrm_dst),
2545 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2549 sz = (hmask+1) * sizeof(struct hlist_head);
2551 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2552 if (!net->xfrm.policy_byidx)
2554 net->xfrm.policy_idx_hmask = hmask;
2556 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2557 struct xfrm_policy_hash *htab;
2559 net->xfrm.policy_count[dir] = 0;
2560 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2562 htab = &net->xfrm.policy_bydst[dir];
2563 htab->table = xfrm_hash_alloc(sz);
2566 htab->hmask = hmask;
2569 INIT_LIST_HEAD(&net->xfrm.policy_all);
2570 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2571 if (net_eq(net, &init_net))
2572 register_netdevice_notifier(&xfrm_dev_notifier);
2576 for (dir--; dir >= 0; dir--) {
2577 struct xfrm_policy_hash *htab;
2579 htab = &net->xfrm.policy_bydst[dir];
2580 xfrm_hash_free(htab->table, sz);
2582 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2587 static void xfrm_policy_fini(struct net *net)
2589 struct xfrm_audit audit_info;
2593 flush_work(&net->xfrm.policy_hash_work);
2594 #ifdef CONFIG_XFRM_SUB_POLICY
2595 audit_info.loginuid = -1;
2596 audit_info.sessionid = -1;
2597 audit_info.secid = 0;
2598 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2600 audit_info.loginuid = -1;
2601 audit_info.sessionid = -1;
2602 audit_info.secid = 0;
2603 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2605 WARN_ON(!list_empty(&net->xfrm.policy_all));
2607 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2608 struct xfrm_policy_hash *htab;
2610 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2612 htab = &net->xfrm.policy_bydst[dir];
2613 sz = (htab->hmask + 1);
2614 WARN_ON(!hlist_empty(htab->table));
2615 xfrm_hash_free(htab->table, sz);
2618 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2619 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2620 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2623 static int __net_init xfrm_net_init(struct net *net)
2627 rv = xfrm_statistics_init(net);
2629 goto out_statistics;
2630 rv = xfrm_state_init(net);
2633 rv = xfrm_policy_init(net);
2636 xfrm_dst_ops_init(net);
2637 rv = xfrm_sysctl_init(net);
2643 xfrm_policy_fini(net);
2645 xfrm_state_fini(net);
2647 xfrm_statistics_fini(net);
2652 static void __net_exit xfrm_net_exit(struct net *net)
2654 xfrm_sysctl_fini(net);
2655 xfrm_policy_fini(net);
2656 xfrm_state_fini(net);
2657 xfrm_statistics_fini(net);
2660 static struct pernet_operations __net_initdata xfrm_net_ops = {
2661 .init = xfrm_net_init,
2662 .exit = xfrm_net_exit,
2665 void __init xfrm_init(void)
2667 register_pernet_subsys(&xfrm_net_ops);
2671 #ifdef CONFIG_AUDITSYSCALL
2672 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2673 struct audit_buffer *audit_buf)
2675 struct xfrm_sec_ctx *ctx = xp->security;
2676 struct xfrm_selector *sel = &xp->selector;
2679 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2680 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2682 switch(sel->family) {
2684 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2685 if (sel->prefixlen_s != 32)
2686 audit_log_format(audit_buf, " src_prefixlen=%d",
2688 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2689 if (sel->prefixlen_d != 32)
2690 audit_log_format(audit_buf, " dst_prefixlen=%d",
2694 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2695 if (sel->prefixlen_s != 128)
2696 audit_log_format(audit_buf, " src_prefixlen=%d",
2698 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2699 if (sel->prefixlen_d != 128)
2700 audit_log_format(audit_buf, " dst_prefixlen=%d",
2706 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2707 uid_t auid, u32 sessionid, u32 secid)
2709 struct audit_buffer *audit_buf;
2711 audit_buf = xfrm_audit_start("SPD-add");
2712 if (audit_buf == NULL)
2714 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2715 audit_log_format(audit_buf, " res=%u", result);
2716 xfrm_audit_common_policyinfo(xp, audit_buf);
2717 audit_log_end(audit_buf);
2719 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2721 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2722 uid_t auid, u32 sessionid, u32 secid)
2724 struct audit_buffer *audit_buf;
2726 audit_buf = xfrm_audit_start("SPD-delete");
2727 if (audit_buf == NULL)
2729 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2730 audit_log_format(audit_buf, " res=%u", result);
2731 xfrm_audit_common_policyinfo(xp, audit_buf);
2732 audit_log_end(audit_buf);
2734 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2737 #ifdef CONFIG_XFRM_MIGRATE
2738 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2739 struct xfrm_selector *sel_tgt)
2741 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2742 if (sel_tgt->family == sel_cmp->family &&
2743 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2744 sel_cmp->family) == 0 &&
2745 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2746 sel_cmp->family) == 0 &&
2747 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2748 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2752 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2759 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2762 struct xfrm_policy *pol, *ret = NULL;
2763 struct hlist_node *entry;
2764 struct hlist_head *chain;
2767 read_lock_bh(&xfrm_policy_lock);
2768 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2769 hlist_for_each_entry(pol, entry, chain, bydst) {
2770 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2771 pol->type == type) {
2773 priority = ret->priority;
2777 chain = &init_net.xfrm.policy_inexact[dir];
2778 hlist_for_each_entry(pol, entry, chain, bydst) {
2779 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2780 pol->type == type &&
2781 pol->priority < priority) {
2790 read_unlock_bh(&xfrm_policy_lock);
2795 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2799 if (t->mode == m->mode && t->id.proto == m->proto &&
2800 (m->reqid == 0 || t->reqid == m->reqid)) {
2802 case XFRM_MODE_TUNNEL:
2803 case XFRM_MODE_BEET:
2804 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2805 m->old_family) == 0 &&
2806 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2807 m->old_family) == 0) {
2811 case XFRM_MODE_TRANSPORT:
2812 /* in case of transport mode, template does not store
2813 any IP addresses, hence we just compare mode and
2824 /* update endpoint address(es) of template(s) */
2825 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2826 struct xfrm_migrate *m, int num_migrate)
2828 struct xfrm_migrate *mp;
2831 write_lock_bh(&pol->lock);
2832 if (unlikely(pol->walk.dead)) {
2833 /* target policy has been deleted */
2834 write_unlock_bh(&pol->lock);
2838 for (i = 0; i < pol->xfrm_nr; i++) {
2839 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2840 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2843 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2844 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2846 /* update endpoints */
2847 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2848 sizeof(pol->xfrm_vec[i].id.daddr));
2849 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2850 sizeof(pol->xfrm_vec[i].saddr));
2851 pol->xfrm_vec[i].encap_family = mp->new_family;
2853 atomic_inc(&pol->genid);
2857 write_unlock_bh(&pol->lock);
2865 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2869 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2872 for (i = 0; i < num_migrate; i++) {
2873 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2874 m[i].old_family) == 0) &&
2875 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2876 m[i].old_family) == 0))
2878 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2879 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2882 /* check if there is any duplicated entry */
2883 for (j = i + 1; j < num_migrate; j++) {
2884 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2885 sizeof(m[i].old_daddr)) &&
2886 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2887 sizeof(m[i].old_saddr)) &&
2888 m[i].proto == m[j].proto &&
2889 m[i].mode == m[j].mode &&
2890 m[i].reqid == m[j].reqid &&
2891 m[i].old_family == m[j].old_family)
2899 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2900 struct xfrm_migrate *m, int num_migrate,
2901 struct xfrm_kmaddress *k)
2903 int i, err, nx_cur = 0, nx_new = 0;
2904 struct xfrm_policy *pol = NULL;
2905 struct xfrm_state *x, *xc;
2906 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2907 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2908 struct xfrm_migrate *mp;
2910 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2913 /* Stage 1 - find policy */
2914 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2919 /* Stage 2 - find and update state(s) */
2920 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2921 if ((x = xfrm_migrate_state_find(mp))) {
2924 if ((xc = xfrm_state_migrate(x, mp))) {
2934 /* Stage 3 - update policy */
2935 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2938 /* Stage 4 - delete old state(s) */
2940 xfrm_states_put(x_cur, nx_cur);
2941 xfrm_states_delete(x_cur, nx_cur);
2944 /* Stage 5 - announce */
2945 km_migrate(sel, dir, type, m, num_migrate, k);
2957 xfrm_states_put(x_cur, nx_cur);
2959 xfrm_states_delete(x_new, nx_new);
2963 EXPORT_SYMBOL(xfrm_migrate);