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_dst *xdst, int family);
56 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
60 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
62 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
63 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
64 !((xfrm_flowi_dport(fl, &fl->uli_u) ^ sel->dport) & sel->dport_mask) &&
65 !((xfrm_flowi_sport(fl, &fl->uli_u) ^ sel->sport) & sel->sport_mask) &&
66 (fl->flowi_proto == sel->proto || !sel->proto) &&
67 (fl->flowi_oif == sel->ifindex || !sel->ifindex);
71 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
73 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
74 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
75 !((xfrm_flowi_dport(fl, &fl->uli_u) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl->uli_u) ^ sel->sport) & sel->sport_mask) &&
77 (fl->flowi_proto == sel->proto || !sel->proto) &&
78 (fl->flowi_oif == sel->ifindex || !sel->ifindex);
81 int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
82 unsigned short family)
86 return __xfrm4_selector_match(sel, fl);
88 return __xfrm6_selector_match(sel, fl);
93 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
94 const xfrm_address_t *saddr,
95 const xfrm_address_t *daddr,
98 struct xfrm_policy_afinfo *afinfo;
99 struct dst_entry *dst;
101 afinfo = xfrm_policy_get_afinfo(family);
102 if (unlikely(afinfo == NULL))
103 return ERR_PTR(-EAFNOSUPPORT);
105 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
107 xfrm_policy_put_afinfo(afinfo);
112 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
113 xfrm_address_t *prev_saddr,
114 xfrm_address_t *prev_daddr,
117 struct net *net = xs_net(x);
118 xfrm_address_t *saddr = &x->props.saddr;
119 xfrm_address_t *daddr = &x->id.daddr;
120 struct dst_entry *dst;
122 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
126 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
131 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
134 if (prev_saddr != saddr)
135 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
136 if (prev_daddr != daddr)
137 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
143 static inline unsigned long make_jiffies(long secs)
145 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
146 return MAX_SCHEDULE_TIMEOUT-1;
151 static void xfrm_policy_timer(unsigned long data)
153 struct xfrm_policy *xp = (struct xfrm_policy*)data;
154 unsigned long now = get_seconds();
155 long next = LONG_MAX;
159 read_lock(&xp->lock);
161 if (unlikely(xp->walk.dead))
164 dir = xfrm_policy_id2dir(xp->index);
166 if (xp->lft.hard_add_expires_seconds) {
167 long tmo = xp->lft.hard_add_expires_seconds +
168 xp->curlft.add_time - now;
174 if (xp->lft.hard_use_expires_seconds) {
175 long tmo = xp->lft.hard_use_expires_seconds +
176 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
182 if (xp->lft.soft_add_expires_seconds) {
183 long tmo = xp->lft.soft_add_expires_seconds +
184 xp->curlft.add_time - now;
187 tmo = XFRM_KM_TIMEOUT;
192 if (xp->lft.soft_use_expires_seconds) {
193 long tmo = xp->lft.soft_use_expires_seconds +
194 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
197 tmo = XFRM_KM_TIMEOUT;
204 km_policy_expired(xp, dir, 0, 0);
205 if (next != LONG_MAX &&
206 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
210 read_unlock(&xp->lock);
215 read_unlock(&xp->lock);
216 if (!xfrm_policy_delete(xp, dir))
217 km_policy_expired(xp, dir, 1, 0);
221 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
223 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
225 if (unlikely(pol->walk.dead))
233 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
235 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
237 return !pol->walk.dead;
240 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
242 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
245 static const struct flow_cache_ops xfrm_policy_fc_ops = {
246 .get = xfrm_policy_flo_get,
247 .check = xfrm_policy_flo_check,
248 .delete = xfrm_policy_flo_delete,
251 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
255 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
257 struct xfrm_policy *policy;
259 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
262 write_pnet(&policy->xp_net, net);
263 INIT_LIST_HEAD(&policy->walk.all);
264 INIT_HLIST_NODE(&policy->bydst);
265 INIT_HLIST_NODE(&policy->byidx);
266 rwlock_init(&policy->lock);
267 atomic_set(&policy->refcnt, 1);
268 setup_timer(&policy->timer, xfrm_policy_timer,
269 (unsigned long)policy);
270 policy->flo.ops = &xfrm_policy_fc_ops;
274 EXPORT_SYMBOL(xfrm_policy_alloc);
276 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
278 void xfrm_policy_destroy(struct xfrm_policy *policy)
280 BUG_ON(!policy->walk.dead);
282 if (del_timer(&policy->timer))
285 security_xfrm_policy_free(policy->security);
288 EXPORT_SYMBOL(xfrm_policy_destroy);
290 /* Rule must be locked. Release descentant resources, announce
291 * entry dead. The rule must be unlinked from lists to the moment.
294 static void xfrm_policy_kill(struct xfrm_policy *policy)
296 policy->walk.dead = 1;
298 atomic_inc(&policy->genid);
300 if (del_timer(&policy->timer))
301 xfrm_pol_put(policy);
303 xfrm_pol_put(policy);
306 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
308 static inline unsigned int idx_hash(struct net *net, u32 index)
310 return __idx_hash(index, net->xfrm.policy_idx_hmask);
313 static struct hlist_head *policy_hash_bysel(struct net *net,
314 const struct xfrm_selector *sel,
315 unsigned short family, int dir)
317 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
318 unsigned int hash = __sel_hash(sel, family, hmask);
320 return (hash == hmask + 1 ?
321 &net->xfrm.policy_inexact[dir] :
322 net->xfrm.policy_bydst[dir].table + hash);
325 static struct hlist_head *policy_hash_direct(struct net *net,
326 const xfrm_address_t *daddr,
327 const xfrm_address_t *saddr,
328 unsigned short family, int dir)
330 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
331 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
333 return net->xfrm.policy_bydst[dir].table + hash;
336 static void xfrm_dst_hash_transfer(struct hlist_head *list,
337 struct hlist_head *ndsttable,
338 unsigned int nhashmask)
340 struct hlist_node *entry, *tmp, *entry0 = NULL;
341 struct xfrm_policy *pol;
345 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
348 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
349 pol->family, nhashmask);
352 hlist_add_head(&pol->bydst, ndsttable+h);
358 hlist_add_after(entry0, &pol->bydst);
362 if (!hlist_empty(list)) {
368 static void xfrm_idx_hash_transfer(struct hlist_head *list,
369 struct hlist_head *nidxtable,
370 unsigned int nhashmask)
372 struct hlist_node *entry, *tmp;
373 struct xfrm_policy *pol;
375 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
378 h = __idx_hash(pol->index, nhashmask);
379 hlist_add_head(&pol->byidx, nidxtable+h);
383 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
385 return ((old_hmask + 1) << 1) - 1;
388 static void xfrm_bydst_resize(struct net *net, int dir)
390 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
391 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
392 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
393 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
394 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
400 write_lock_bh(&xfrm_policy_lock);
402 for (i = hmask; i >= 0; i--)
403 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
405 net->xfrm.policy_bydst[dir].table = ndst;
406 net->xfrm.policy_bydst[dir].hmask = nhashmask;
408 write_unlock_bh(&xfrm_policy_lock);
410 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
413 static void xfrm_byidx_resize(struct net *net, int total)
415 unsigned int hmask = net->xfrm.policy_idx_hmask;
416 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
417 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
418 struct hlist_head *oidx = net->xfrm.policy_byidx;
419 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
425 write_lock_bh(&xfrm_policy_lock);
427 for (i = hmask; i >= 0; i--)
428 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
430 net->xfrm.policy_byidx = nidx;
431 net->xfrm.policy_idx_hmask = nhashmask;
433 write_unlock_bh(&xfrm_policy_lock);
435 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
438 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
440 unsigned int cnt = net->xfrm.policy_count[dir];
441 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
446 if ((hmask + 1) < xfrm_policy_hashmax &&
453 static inline int xfrm_byidx_should_resize(struct net *net, int total)
455 unsigned int hmask = net->xfrm.policy_idx_hmask;
457 if ((hmask + 1) < xfrm_policy_hashmax &&
464 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
466 read_lock_bh(&xfrm_policy_lock);
467 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
468 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
469 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
470 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
471 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
472 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
473 si->spdhcnt = net->xfrm.policy_idx_hmask;
474 si->spdhmcnt = xfrm_policy_hashmax;
475 read_unlock_bh(&xfrm_policy_lock);
477 EXPORT_SYMBOL(xfrm_spd_getinfo);
479 static DEFINE_MUTEX(hash_resize_mutex);
480 static void xfrm_hash_resize(struct work_struct *work)
482 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
485 mutex_lock(&hash_resize_mutex);
488 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
489 if (xfrm_bydst_should_resize(net, dir, &total))
490 xfrm_bydst_resize(net, dir);
492 if (xfrm_byidx_should_resize(net, total))
493 xfrm_byidx_resize(net, total);
495 mutex_unlock(&hash_resize_mutex);
498 /* Generate new index... KAME seems to generate them ordered by cost
499 * of an absolute inpredictability of ordering of rules. This will not pass. */
500 static u32 xfrm_gen_index(struct net *net, int dir)
502 static u32 idx_generator;
505 struct hlist_node *entry;
506 struct hlist_head *list;
507 struct xfrm_policy *p;
511 idx = (idx_generator | dir);
515 list = net->xfrm.policy_byidx + idx_hash(net, idx);
517 hlist_for_each_entry(p, entry, list, byidx) {
518 if (p->index == idx) {
528 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
530 u32 *p1 = (u32 *) s1;
531 u32 *p2 = (u32 *) s2;
532 int len = sizeof(struct xfrm_selector) / sizeof(u32);
535 for (i = 0; i < len; i++) {
543 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
545 struct net *net = xp_net(policy);
546 struct xfrm_policy *pol;
547 struct xfrm_policy *delpol;
548 struct hlist_head *chain;
549 struct hlist_node *entry, *newpos;
550 u32 mark = policy->mark.v & policy->mark.m;
552 write_lock_bh(&xfrm_policy_lock);
553 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
556 hlist_for_each_entry(pol, entry, chain, bydst) {
557 if (pol->type == policy->type &&
558 !selector_cmp(&pol->selector, &policy->selector) &&
559 (mark & pol->mark.m) == pol->mark.v &&
560 xfrm_sec_ctx_match(pol->security, policy->security) &&
563 write_unlock_bh(&xfrm_policy_lock);
567 if (policy->priority > pol->priority)
569 } else if (policy->priority >= pol->priority) {
570 newpos = &pol->bydst;
577 hlist_add_after(newpos, &policy->bydst);
579 hlist_add_head(&policy->bydst, chain);
580 xfrm_pol_hold(policy);
581 net->xfrm.policy_count[dir]++;
582 atomic_inc(&flow_cache_genid);
584 __xfrm_policy_unlink(delpol, dir);
585 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
586 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
587 policy->curlft.add_time = get_seconds();
588 policy->curlft.use_time = 0;
589 if (!mod_timer(&policy->timer, jiffies + HZ))
590 xfrm_pol_hold(policy);
591 list_add(&policy->walk.all, &net->xfrm.policy_all);
592 write_unlock_bh(&xfrm_policy_lock);
595 xfrm_policy_kill(delpol);
596 else if (xfrm_bydst_should_resize(net, dir, NULL))
597 schedule_work(&net->xfrm.policy_hash_work);
601 EXPORT_SYMBOL(xfrm_policy_insert);
603 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
604 int dir, struct xfrm_selector *sel,
605 struct xfrm_sec_ctx *ctx, int delete,
608 struct xfrm_policy *pol, *ret;
609 struct hlist_head *chain;
610 struct hlist_node *entry;
613 write_lock_bh(&xfrm_policy_lock);
614 chain = policy_hash_bysel(net, sel, sel->family, dir);
616 hlist_for_each_entry(pol, entry, chain, bydst) {
617 if (pol->type == type &&
618 (mark & pol->mark.m) == pol->mark.v &&
619 !selector_cmp(sel, &pol->selector) &&
620 xfrm_sec_ctx_match(ctx, pol->security)) {
623 *err = security_xfrm_policy_delete(
626 write_unlock_bh(&xfrm_policy_lock);
629 __xfrm_policy_unlink(pol, dir);
635 write_unlock_bh(&xfrm_policy_lock);
638 xfrm_policy_kill(ret);
641 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
643 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
644 int dir, u32 id, int delete, int *err)
646 struct xfrm_policy *pol, *ret;
647 struct hlist_head *chain;
648 struct hlist_node *entry;
651 if (xfrm_policy_id2dir(id) != dir)
655 write_lock_bh(&xfrm_policy_lock);
656 chain = net->xfrm.policy_byidx + idx_hash(net, id);
658 hlist_for_each_entry(pol, entry, chain, byidx) {
659 if (pol->type == type && pol->index == id &&
660 (mark & pol->mark.m) == pol->mark.v) {
663 *err = security_xfrm_policy_delete(
666 write_unlock_bh(&xfrm_policy_lock);
669 __xfrm_policy_unlink(pol, dir);
675 write_unlock_bh(&xfrm_policy_lock);
678 xfrm_policy_kill(ret);
681 EXPORT_SYMBOL(xfrm_policy_byid);
683 #ifdef CONFIG_SECURITY_NETWORK_XFRM
685 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
689 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
690 struct xfrm_policy *pol;
691 struct hlist_node *entry;
694 hlist_for_each_entry(pol, entry,
695 &net->xfrm.policy_inexact[dir], bydst) {
696 if (pol->type != type)
698 err = security_xfrm_policy_delete(pol->security);
700 xfrm_audit_policy_delete(pol, 0,
701 audit_info->loginuid,
702 audit_info->sessionid,
707 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
708 hlist_for_each_entry(pol, entry,
709 net->xfrm.policy_bydst[dir].table + i,
711 if (pol->type != type)
713 err = security_xfrm_policy_delete(
716 xfrm_audit_policy_delete(pol, 0,
717 audit_info->loginuid,
718 audit_info->sessionid,
729 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
735 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
737 int dir, err = 0, cnt = 0;
739 write_lock_bh(&xfrm_policy_lock);
741 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
745 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
746 struct xfrm_policy *pol;
747 struct hlist_node *entry;
751 hlist_for_each_entry(pol, entry,
752 &net->xfrm.policy_inexact[dir], bydst) {
753 if (pol->type != type)
755 __xfrm_policy_unlink(pol, dir);
756 write_unlock_bh(&xfrm_policy_lock);
759 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
760 audit_info->sessionid,
763 xfrm_policy_kill(pol);
765 write_lock_bh(&xfrm_policy_lock);
769 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
771 hlist_for_each_entry(pol, entry,
772 net->xfrm.policy_bydst[dir].table + i,
774 if (pol->type != type)
776 __xfrm_policy_unlink(pol, dir);
777 write_unlock_bh(&xfrm_policy_lock);
780 xfrm_audit_policy_delete(pol, 1,
781 audit_info->loginuid,
782 audit_info->sessionid,
784 xfrm_policy_kill(pol);
786 write_lock_bh(&xfrm_policy_lock);
795 write_unlock_bh(&xfrm_policy_lock);
798 EXPORT_SYMBOL(xfrm_policy_flush);
800 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
801 int (*func)(struct xfrm_policy *, int, int, void*),
804 struct xfrm_policy *pol;
805 struct xfrm_policy_walk_entry *x;
808 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
809 walk->type != XFRM_POLICY_TYPE_ANY)
812 if (list_empty(&walk->walk.all) && walk->seq != 0)
815 write_lock_bh(&xfrm_policy_lock);
816 if (list_empty(&walk->walk.all))
817 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
819 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
820 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
823 pol = container_of(x, struct xfrm_policy, walk);
824 if (walk->type != XFRM_POLICY_TYPE_ANY &&
825 walk->type != pol->type)
827 error = func(pol, xfrm_policy_id2dir(pol->index),
830 list_move_tail(&walk->walk.all, &x->all);
835 if (walk->seq == 0) {
839 list_del_init(&walk->walk.all);
841 write_unlock_bh(&xfrm_policy_lock);
844 EXPORT_SYMBOL(xfrm_policy_walk);
846 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
848 INIT_LIST_HEAD(&walk->walk.all);
853 EXPORT_SYMBOL(xfrm_policy_walk_init);
855 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
857 if (list_empty(&walk->walk.all))
860 write_lock_bh(&xfrm_policy_lock);
861 list_del(&walk->walk.all);
862 write_unlock_bh(&xfrm_policy_lock);
864 EXPORT_SYMBOL(xfrm_policy_walk_done);
867 * Find policy to apply to this flow.
869 * Returns 0 if policy found, else an -errno.
871 static int xfrm_policy_match(const struct xfrm_policy *pol,
872 const struct flowi *fl,
873 u8 type, u16 family, int dir)
875 const struct xfrm_selector *sel = &pol->selector;
876 int match, ret = -ESRCH;
878 if (pol->family != family ||
879 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
883 match = xfrm_selector_match(sel, fl, family);
885 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
891 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
892 const struct flowi *fl,
896 struct xfrm_policy *pol, *ret;
897 const xfrm_address_t *daddr, *saddr;
898 struct hlist_node *entry;
899 struct hlist_head *chain;
902 daddr = xfrm_flowi_daddr(fl, family);
903 saddr = xfrm_flowi_saddr(fl, family);
904 if (unlikely(!daddr || !saddr))
907 read_lock_bh(&xfrm_policy_lock);
908 chain = policy_hash_direct(net, daddr, saddr, family, dir);
910 hlist_for_each_entry(pol, entry, chain, bydst) {
911 err = xfrm_policy_match(pol, fl, type, family, dir);
921 priority = ret->priority;
925 chain = &net->xfrm.policy_inexact[dir];
926 hlist_for_each_entry(pol, entry, chain, bydst) {
927 err = xfrm_policy_match(pol, fl, type, family, dir);
935 } else if (pol->priority < priority) {
943 read_unlock_bh(&xfrm_policy_lock);
948 static struct xfrm_policy *
949 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
951 #ifdef CONFIG_XFRM_SUB_POLICY
952 struct xfrm_policy *pol;
954 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
958 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
961 static struct flow_cache_object *
962 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
963 u8 dir, struct flow_cache_object *old_obj, void *ctx)
965 struct xfrm_policy *pol;
968 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
970 pol = __xfrm_policy_lookup(net, fl, family, dir);
971 if (IS_ERR_OR_NULL(pol))
972 return ERR_CAST(pol);
974 /* Resolver returns two references:
975 * one for cache and one for caller of flow_cache_lookup() */
981 static inline int policy_to_flow_dir(int dir)
983 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
984 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
985 XFRM_POLICY_FWD == FLOW_DIR_FWD)
991 case XFRM_POLICY_OUT:
993 case XFRM_POLICY_FWD:
998 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
999 const struct flowi *fl)
1001 struct xfrm_policy *pol;
1003 read_lock_bh(&xfrm_policy_lock);
1004 if ((pol = sk->sk_policy[dir]) != NULL) {
1005 int match = xfrm_selector_match(&pol->selector, fl,
1010 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1014 err = security_xfrm_policy_lookup(pol->security,
1016 policy_to_flow_dir(dir));
1019 else if (err == -ESRCH)
1027 read_unlock_bh(&xfrm_policy_lock);
1031 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1033 struct net *net = xp_net(pol);
1034 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1037 list_add(&pol->walk.all, &net->xfrm.policy_all);
1038 hlist_add_head(&pol->bydst, chain);
1039 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1040 net->xfrm.policy_count[dir]++;
1043 if (xfrm_bydst_should_resize(net, dir, NULL))
1044 schedule_work(&net->xfrm.policy_hash_work);
1047 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1050 struct net *net = xp_net(pol);
1052 if (hlist_unhashed(&pol->bydst))
1055 hlist_del(&pol->bydst);
1056 hlist_del(&pol->byidx);
1057 list_del(&pol->walk.all);
1058 net->xfrm.policy_count[dir]--;
1063 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1065 write_lock_bh(&xfrm_policy_lock);
1066 pol = __xfrm_policy_unlink(pol, dir);
1067 write_unlock_bh(&xfrm_policy_lock);
1069 xfrm_policy_kill(pol);
1074 EXPORT_SYMBOL(xfrm_policy_delete);
1076 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1078 struct net *net = xp_net(pol);
1079 struct xfrm_policy *old_pol;
1081 #ifdef CONFIG_XFRM_SUB_POLICY
1082 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1086 write_lock_bh(&xfrm_policy_lock);
1087 old_pol = sk->sk_policy[dir];
1088 sk->sk_policy[dir] = pol;
1090 pol->curlft.add_time = get_seconds();
1091 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1092 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1095 /* Unlinking succeeds always. This is the only function
1096 * allowed to delete or replace socket policy.
1098 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1099 write_unlock_bh(&xfrm_policy_lock);
1102 xfrm_policy_kill(old_pol);
1107 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1109 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1112 newp->selector = old->selector;
1113 if (security_xfrm_policy_clone(old->security,
1116 return NULL; /* ENOMEM */
1118 newp->lft = old->lft;
1119 newp->curlft = old->curlft;
1120 newp->mark = old->mark;
1121 newp->action = old->action;
1122 newp->flags = old->flags;
1123 newp->xfrm_nr = old->xfrm_nr;
1124 newp->index = old->index;
1125 newp->type = old->type;
1126 memcpy(newp->xfrm_vec, old->xfrm_vec,
1127 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1128 write_lock_bh(&xfrm_policy_lock);
1129 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1130 write_unlock_bh(&xfrm_policy_lock);
1136 int __xfrm_sk_clone_policy(struct sock *sk)
1138 struct xfrm_policy *p0 = sk->sk_policy[0],
1139 *p1 = sk->sk_policy[1];
1141 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1142 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1144 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1150 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1151 unsigned short family)
1154 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1156 if (unlikely(afinfo == NULL))
1158 err = afinfo->get_saddr(net, local, remote);
1159 xfrm_policy_put_afinfo(afinfo);
1163 /* Resolve list of templates for the flow, given policy. */
1166 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1167 struct xfrm_state **xfrm, unsigned short family)
1169 struct net *net = xp_net(policy);
1172 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1173 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1176 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1177 struct xfrm_state *x;
1178 xfrm_address_t *remote = daddr;
1179 xfrm_address_t *local = saddr;
1180 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1182 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1183 tmpl->mode == XFRM_MODE_BEET) {
1184 remote = &tmpl->id.daddr;
1185 local = &tmpl->saddr;
1186 if (xfrm_addr_any(local, tmpl->encap_family)) {
1187 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1194 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1196 if (x && x->km.state == XFRM_STATE_VALID) {
1203 error = (x->km.state == XFRM_STATE_ERROR ?
1207 else if (error == -ESRCH)
1210 if (!tmpl->optional)
1216 for (nx--; nx>=0; nx--)
1217 xfrm_state_put(xfrm[nx]);
1222 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1223 struct xfrm_state **xfrm, unsigned short family)
1225 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1226 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1232 for (i = 0; i < npols; i++) {
1233 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1238 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1246 /* found states are sorted for outbound processing */
1248 xfrm_state_sort(xfrm, tpp, cnx, family);
1253 for (cnx--; cnx>=0; cnx--)
1254 xfrm_state_put(tpp[cnx]);
1259 /* Check that the bundle accepts the flow and its components are
1263 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1265 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1271 tos = afinfo->get_tos(fl);
1273 xfrm_policy_put_afinfo(afinfo);
1278 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1280 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1281 struct dst_entry *dst = &xdst->u.dst;
1283 if (xdst->route == NULL) {
1284 /* Dummy bundle - if it has xfrms we were not
1285 * able to build bundle as template resolution failed.
1286 * It means we need to try again resolving. */
1287 if (xdst->num_xfrms > 0)
1291 if (stale_bundle(dst))
1299 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1301 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1302 struct dst_entry *dst = &xdst->u.dst;
1306 if (stale_bundle(dst))
1312 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1314 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1315 struct dst_entry *dst = &xdst->u.dst;
1320 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1321 .get = xfrm_bundle_flo_get,
1322 .check = xfrm_bundle_flo_check,
1323 .delete = xfrm_bundle_flo_delete,
1326 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1328 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1329 struct dst_ops *dst_ops;
1330 struct xfrm_dst *xdst;
1333 return ERR_PTR(-EINVAL);
1337 dst_ops = &net->xfrm.xfrm4_dst_ops;
1339 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1341 dst_ops = &net->xfrm.xfrm6_dst_ops;
1347 xdst = dst_alloc(dst_ops, 0);
1348 xfrm_policy_put_afinfo(afinfo);
1351 xdst->flo.ops = &xfrm_bundle_fc_ops;
1353 xdst = ERR_PTR(-ENOBUFS);
1358 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1361 struct xfrm_policy_afinfo *afinfo =
1362 xfrm_policy_get_afinfo(dst->ops->family);
1368 err = afinfo->init_path(path, dst, nfheader_len);
1370 xfrm_policy_put_afinfo(afinfo);
1375 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1376 const struct flowi *fl)
1378 struct xfrm_policy_afinfo *afinfo =
1379 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1385 err = afinfo->fill_dst(xdst, dev, fl);
1387 xfrm_policy_put_afinfo(afinfo);
1393 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1394 * all the metrics... Shortly, bundle a bundle.
1397 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1398 struct xfrm_state **xfrm, int nx,
1399 const struct flowi *fl,
1400 struct dst_entry *dst)
1402 struct net *net = xp_net(policy);
1403 unsigned long now = jiffies;
1404 struct net_device *dev;
1405 struct dst_entry *dst_prev = NULL;
1406 struct dst_entry *dst0 = NULL;
1410 int nfheader_len = 0;
1411 int trailer_len = 0;
1413 int family = policy->selector.family;
1414 xfrm_address_t saddr, daddr;
1416 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1418 tos = xfrm_get_tos(fl, family);
1425 for (; i < nx; i++) {
1426 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1427 struct dst_entry *dst1 = &xdst->u.dst;
1429 err = PTR_ERR(xdst);
1438 dst_prev->child = dst_clone(dst1);
1439 dst1->flags |= DST_NOHASH;
1443 dst_copy_metrics(dst1, dst);
1445 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1446 family = xfrm[i]->props.family;
1447 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1455 dst1->xfrm = xfrm[i];
1456 xdst->xfrm_genid = xfrm[i]->genid;
1458 dst1->obsolete = -1;
1459 dst1->flags |= DST_HOST;
1460 dst1->lastuse = now;
1462 dst1->input = dst_discard;
1463 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1465 dst1->next = dst_prev;
1468 header_len += xfrm[i]->props.header_len;
1469 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1470 nfheader_len += xfrm[i]->props.header_len;
1471 trailer_len += xfrm[i]->props.trailer_len;
1474 dst_prev->child = dst;
1482 /* Copy neighbour for reachability confirmation */
1483 dst0->neighbour = neigh_clone(dst->neighbour);
1485 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1486 xfrm_init_pmtu(dst_prev);
1488 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1489 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1491 err = xfrm_fill_dst(xdst, dev, fl);
1495 dst_prev->header_len = header_len;
1496 dst_prev->trailer_len = trailer_len;
1497 header_len -= xdst->u.dst.xfrm->props.header_len;
1498 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1506 xfrm_state_put(xfrm[i]);
1510 dst0 = ERR_PTR(err);
1515 xfrm_dst_alloc_copy(void **target, const void *src, int size)
1518 *target = kmalloc(size, GFP_ATOMIC);
1522 memcpy(*target, src, size);
1527 xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel)
1529 #ifdef CONFIG_XFRM_SUB_POLICY
1530 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1531 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1539 xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl)
1541 #ifdef CONFIG_XFRM_SUB_POLICY
1542 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1543 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1549 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1550 struct xfrm_policy **pols,
1551 int *num_pols, int *num_xfrms)
1555 if (*num_pols == 0 || !pols[0]) {
1560 if (IS_ERR(pols[0]))
1561 return PTR_ERR(pols[0]);
1563 *num_xfrms = pols[0]->xfrm_nr;
1565 #ifdef CONFIG_XFRM_SUB_POLICY
1566 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1567 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1568 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1569 XFRM_POLICY_TYPE_MAIN,
1573 if (IS_ERR(pols[1])) {
1574 xfrm_pols_put(pols, *num_pols);
1575 return PTR_ERR(pols[1]);
1578 (*num_xfrms) += pols[1]->xfrm_nr;
1582 for (i = 0; i < *num_pols; i++) {
1583 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1593 static struct xfrm_dst *
1594 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1595 const struct flowi *fl, u16 family,
1596 struct dst_entry *dst_orig)
1598 struct net *net = xp_net(pols[0]);
1599 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1600 struct dst_entry *dst;
1601 struct xfrm_dst *xdst;
1604 /* Try to instantiate a bundle */
1605 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1607 if (err != 0 && err != -EAGAIN)
1608 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1609 return ERR_PTR(err);
1612 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1614 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1615 return ERR_CAST(dst);
1618 xdst = (struct xfrm_dst *)dst;
1619 xdst->num_xfrms = err;
1621 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1623 err = xfrm_dst_update_origin(dst, fl);
1624 if (unlikely(err)) {
1626 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1627 return ERR_PTR(err);
1630 xdst->num_pols = num_pols;
1631 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1632 xdst->policy_genid = atomic_read(&pols[0]->genid);
1637 static struct flow_cache_object *
1638 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1639 struct flow_cache_object *oldflo, void *ctx)
1641 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1642 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1643 struct xfrm_dst *xdst, *new_xdst;
1644 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1646 /* Check if the policies from old bundle are usable */
1649 xdst = container_of(oldflo, struct xfrm_dst, flo);
1650 num_pols = xdst->num_pols;
1651 num_xfrms = xdst->num_xfrms;
1653 for (i = 0; i < num_pols; i++) {
1654 pols[i] = xdst->pols[i];
1655 pol_dead |= pols[i]->walk.dead;
1658 dst_free(&xdst->u.dst);
1666 /* Resolve policies to use if we couldn't get them from
1667 * previous cache entry */
1670 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1671 err = xfrm_expand_policies(fl, family, pols,
1672 &num_pols, &num_xfrms);
1678 goto make_dummy_bundle;
1681 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1682 if (IS_ERR(new_xdst)) {
1683 err = PTR_ERR(new_xdst);
1687 goto make_dummy_bundle;
1688 dst_hold(&xdst->u.dst);
1690 } else if (new_xdst == NULL) {
1693 goto make_dummy_bundle;
1694 xdst->num_xfrms = 0;
1695 dst_hold(&xdst->u.dst);
1699 /* Kill the previous bundle */
1701 /* The policies were stolen for newly generated bundle */
1703 dst_free(&xdst->u.dst);
1706 /* Flow cache does not have reference, it dst_free()'s,
1707 * but we do need to return one reference for original caller */
1708 dst_hold(&new_xdst->u.dst);
1709 return &new_xdst->flo;
1712 /* We found policies, but there's no bundles to instantiate:
1713 * either because the policy blocks, has no transformations or
1714 * we could not build template (no xfrm_states).*/
1715 xdst = xfrm_alloc_dst(net, family);
1717 xfrm_pols_put(pols, num_pols);
1718 return ERR_CAST(xdst);
1720 xdst->num_pols = num_pols;
1721 xdst->num_xfrms = num_xfrms;
1722 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1724 dst_hold(&xdst->u.dst);
1728 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1731 dst_free(&xdst->u.dst);
1733 xfrm_pols_put(pols, num_pols);
1734 return ERR_PTR(err);
1737 static struct dst_entry *make_blackhole(struct net *net, u16 family,
1738 struct dst_entry *dst_orig)
1740 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1741 struct dst_entry *ret;
1744 dst_release(dst_orig);
1745 ret = ERR_PTR(-EINVAL);
1747 ret = afinfo->blackhole_route(net, dst_orig);
1749 xfrm_policy_put_afinfo(afinfo);
1754 /* Main function: finds/creates a bundle for given flow.
1756 * At the moment we eat a raw IP route. Mostly to speed up lookups
1757 * on interfaces with disabled IPsec.
1759 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
1760 const struct flowi *fl,
1761 struct sock *sk, int flags)
1763 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1764 struct flow_cache_object *flo;
1765 struct xfrm_dst *xdst;
1766 struct dst_entry *dst, *route;
1767 u16 family = dst_orig->ops->family;
1768 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1769 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1776 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1778 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1779 err = xfrm_expand_policies(fl, family, pols,
1780 &num_pols, &num_xfrms);
1785 if (num_xfrms <= 0) {
1786 drop_pols = num_pols;
1790 xdst = xfrm_resolve_and_create_bundle(
1794 xfrm_pols_put(pols, num_pols);
1795 err = PTR_ERR(xdst);
1797 } else if (xdst == NULL) {
1799 drop_pols = num_pols;
1803 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1804 xdst->u.dst.next = xfrm_policy_sk_bundles;
1805 xfrm_policy_sk_bundles = &xdst->u.dst;
1806 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1808 route = xdst->route;
1813 /* To accelerate a bit... */
1814 if ((dst_orig->flags & DST_NOXFRM) ||
1815 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1818 flo = flow_cache_lookup(net, fl, family, dir,
1819 xfrm_bundle_lookup, dst_orig);
1826 xdst = container_of(flo, struct xfrm_dst, flo);
1828 num_pols = xdst->num_pols;
1829 num_xfrms = xdst->num_xfrms;
1830 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1831 route = xdst->route;
1835 if (route == NULL && num_xfrms > 0) {
1836 /* The only case when xfrm_bundle_lookup() returns a
1837 * bundle with null route, is when the template could
1838 * not be resolved. It means policies are there, but
1839 * bundle could not be created, since we don't yet
1840 * have the xfrm_state's. We need to wait for KM to
1841 * negotiate new SA's or bail out with error.*/
1842 if (net->xfrm.sysctl_larval_drop) {
1843 /* EREMOTE tells the caller to generate
1844 * a one-shot blackhole route. */
1846 xfrm_pols_put(pols, drop_pols);
1847 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1849 return make_blackhole(net, family, dst_orig);
1851 if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) {
1852 DECLARE_WAITQUEUE(wait, current);
1854 add_wait_queue(&net->xfrm.km_waitq, &wait);
1855 set_current_state(TASK_INTERRUPTIBLE);
1857 set_current_state(TASK_RUNNING);
1858 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1860 if (!signal_pending(current)) {
1869 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1877 if ((flags & XFRM_LOOKUP_ICMP) &&
1878 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1883 for (i = 0; i < num_pols; i++)
1884 pols[i]->curlft.use_time = get_seconds();
1886 if (num_xfrms < 0) {
1887 /* Prohibit the flow */
1888 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1891 } else if (num_xfrms > 0) {
1892 /* Flow transformed */
1893 dst_release(dst_orig);
1895 /* Flow passes untransformed */
1900 xfrm_pols_put(pols, drop_pols);
1904 if (!(flags & XFRM_LOOKUP_ICMP)) {
1912 dst_release(dst_orig);
1913 xfrm_pols_put(pols, drop_pols);
1914 return ERR_PTR(err);
1916 EXPORT_SYMBOL(xfrm_lookup);
1919 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
1921 struct xfrm_state *x;
1923 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1925 x = skb->sp->xvec[idx];
1926 if (!x->type->reject)
1928 return x->type->reject(x, skb, fl);
1931 /* When skb is transformed back to its "native" form, we have to
1932 * check policy restrictions. At the moment we make this in maximally
1933 * stupid way. Shame on me. :-) Of course, connected sockets must
1934 * have policy cached at them.
1938 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1939 unsigned short family)
1941 if (xfrm_state_kern(x))
1942 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1943 return x->id.proto == tmpl->id.proto &&
1944 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1945 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1946 x->props.mode == tmpl->mode &&
1947 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1948 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1949 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1950 xfrm_state_addr_cmp(tmpl, x, family));
1954 * 0 or more than 0 is returned when validation is succeeded (either bypass
1955 * because of optional transport mode, or next index of the mathced secpath
1956 * state with the template.
1957 * -1 is returned when no matching template is found.
1958 * Otherwise "-2 - errored_index" is returned.
1961 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1962 unsigned short family)
1966 if (tmpl->optional) {
1967 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1971 for (; idx < sp->len; idx++) {
1972 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1974 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1983 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1984 unsigned int family, int reverse)
1986 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1989 if (unlikely(afinfo == NULL))
1990 return -EAFNOSUPPORT;
1992 afinfo->decode_session(skb, fl, reverse);
1993 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
1994 xfrm_policy_put_afinfo(afinfo);
1997 EXPORT_SYMBOL(__xfrm_decode_session);
1999 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2001 for (; k < sp->len; k++) {
2002 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2011 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2012 unsigned short family)
2014 struct net *net = dev_net(skb->dev);
2015 struct xfrm_policy *pol;
2016 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2025 reverse = dir & ~XFRM_POLICY_MASK;
2026 dir &= XFRM_POLICY_MASK;
2027 fl_dir = policy_to_flow_dir(dir);
2029 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2030 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2034 nf_nat_decode_session(skb, &fl, family);
2036 /* First, check used SA against their selectors. */
2040 for (i=skb->sp->len-1; i>=0; i--) {
2041 struct xfrm_state *x = skb->sp->xvec[i];
2042 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2043 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2050 if (sk && sk->sk_policy[dir]) {
2051 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2053 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2059 struct flow_cache_object *flo;
2061 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2062 xfrm_policy_lookup, NULL);
2063 if (IS_ERR_OR_NULL(flo))
2064 pol = ERR_CAST(flo);
2066 pol = container_of(flo, struct xfrm_policy, flo);
2070 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2075 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2076 xfrm_secpath_reject(xerr_idx, skb, &fl);
2077 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2083 pol->curlft.use_time = get_seconds();
2087 #ifdef CONFIG_XFRM_SUB_POLICY
2088 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2089 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2093 if (IS_ERR(pols[1])) {
2094 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2097 pols[1]->curlft.use_time = get_seconds();
2103 if (pol->action == XFRM_POLICY_ALLOW) {
2104 struct sec_path *sp;
2105 static struct sec_path dummy;
2106 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2107 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2108 struct xfrm_tmpl **tpp = tp;
2112 if ((sp = skb->sp) == NULL)
2115 for (pi = 0; pi < npols; pi++) {
2116 if (pols[pi] != pol &&
2117 pols[pi]->action != XFRM_POLICY_ALLOW) {
2118 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2121 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2122 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2125 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2126 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2130 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2134 /* For each tunnel xfrm, find the first matching tmpl.
2135 * For each tmpl before that, find corresponding xfrm.
2136 * Order is _important_. Later we will implement
2137 * some barriers, but at the moment barriers
2138 * are implied between each two transformations.
2140 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2141 k = xfrm_policy_ok(tpp[i], sp, k, family);
2144 /* "-2 - errored_index" returned */
2146 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2151 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2152 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2156 xfrm_pols_put(pols, npols);
2159 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2162 xfrm_secpath_reject(xerr_idx, skb, &fl);
2164 xfrm_pols_put(pols, npols);
2167 EXPORT_SYMBOL(__xfrm_policy_check);
2169 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2171 struct net *net = dev_net(skb->dev);
2173 struct dst_entry *dst;
2176 if (xfrm_decode_session(skb, &fl, family) < 0) {
2177 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2183 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2188 skb_dst_set(skb, dst);
2191 EXPORT_SYMBOL(__xfrm_route_forward);
2193 /* Optimize later using cookies and generation ids. */
2195 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2197 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2198 * to "-1" to force all XFRM destinations to get validated by
2199 * dst_ops->check on every use. We do this because when a
2200 * normal route referenced by an XFRM dst is obsoleted we do
2201 * not go looking around for all parent referencing XFRM dsts
2202 * so that we can invalidate them. It is just too much work.
2203 * Instead we make the checks here on every use. For example:
2205 * XFRM dst A --> IPv4 dst X
2207 * X is the "xdst->route" of A (X is also the "dst->path" of A
2208 * in this example). If X is marked obsolete, "A" will not
2209 * notice. That's what we are validating here via the
2210 * stale_bundle() check.
2212 * When a policy's bundle is pruned, we dst_free() the XFRM
2213 * dst which causes it's ->obsolete field to be set to a
2214 * positive non-zero integer. If an XFRM dst has been pruned
2215 * like this, we want to force a new route lookup.
2217 if (dst->obsolete < 0 && !stale_bundle(dst))
2223 static int stale_bundle(struct dst_entry *dst)
2225 return !xfrm_bundle_ok((struct xfrm_dst *)dst, AF_UNSPEC);
2228 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2230 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2231 dst->dev = dev_net(dev)->loopback_dev;
2236 EXPORT_SYMBOL(xfrm_dst_ifdown);
2238 static void xfrm_link_failure(struct sk_buff *skb)
2240 /* Impossible. Such dst must be popped before reaches point of failure. */
2243 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2246 if (dst->obsolete) {
2254 static void __xfrm_garbage_collect(struct net *net)
2256 struct dst_entry *head, *next;
2260 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2261 head = xfrm_policy_sk_bundles;
2262 xfrm_policy_sk_bundles = NULL;
2263 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2272 static void xfrm_init_pmtu(struct dst_entry *dst)
2275 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2276 u32 pmtu, route_mtu_cached;
2278 pmtu = dst_mtu(dst->child);
2279 xdst->child_mtu_cached = pmtu;
2281 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2283 route_mtu_cached = dst_mtu(xdst->route);
2284 xdst->route_mtu_cached = route_mtu_cached;
2286 if (pmtu > route_mtu_cached)
2287 pmtu = route_mtu_cached;
2289 dst_metric_set(dst, RTAX_MTU, pmtu);
2290 } while ((dst = dst->next));
2293 /* Check that the bundle accepts the flow and its components are
2297 static int xfrm_bundle_ok(struct xfrm_dst *first, int family)
2299 struct dst_entry *dst = &first->u.dst;
2300 struct xfrm_dst *last;
2303 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2304 (dst->dev && !netif_running(dst->dev)))
2310 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2312 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2314 if (xdst->xfrm_genid != dst->xfrm->genid)
2316 if (xdst->num_pols > 0 &&
2317 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2320 mtu = dst_mtu(dst->child);
2321 if (xdst->child_mtu_cached != mtu) {
2323 xdst->child_mtu_cached = mtu;
2326 if (!dst_check(xdst->route, xdst->route_cookie))
2328 mtu = dst_mtu(xdst->route);
2329 if (xdst->route_mtu_cached != mtu) {
2331 xdst->route_mtu_cached = mtu;
2335 } while (dst->xfrm);
2340 mtu = last->child_mtu_cached;
2344 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2345 if (mtu > last->route_mtu_cached)
2346 mtu = last->route_mtu_cached;
2347 dst_metric_set(dst, RTAX_MTU, mtu);
2352 last = (struct xfrm_dst *)last->u.dst.next;
2353 last->child_mtu_cached = mtu;
2359 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2361 return dst_metric_advmss(dst->path);
2364 static unsigned int xfrm_default_mtu(const struct dst_entry *dst)
2366 return dst_mtu(dst->path);
2369 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2373 if (unlikely(afinfo == NULL))
2375 if (unlikely(afinfo->family >= NPROTO))
2376 return -EAFNOSUPPORT;
2377 write_lock_bh(&xfrm_policy_afinfo_lock);
2378 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2381 struct dst_ops *dst_ops = afinfo->dst_ops;
2382 if (likely(dst_ops->kmem_cachep == NULL))
2383 dst_ops->kmem_cachep = xfrm_dst_cache;
2384 if (likely(dst_ops->check == NULL))
2385 dst_ops->check = xfrm_dst_check;
2386 if (likely(dst_ops->default_advmss == NULL))
2387 dst_ops->default_advmss = xfrm_default_advmss;
2388 if (likely(dst_ops->default_mtu == NULL))
2389 dst_ops->default_mtu = xfrm_default_mtu;
2390 if (likely(dst_ops->negative_advice == NULL))
2391 dst_ops->negative_advice = xfrm_negative_advice;
2392 if (likely(dst_ops->link_failure == NULL))
2393 dst_ops->link_failure = xfrm_link_failure;
2394 if (likely(afinfo->garbage_collect == NULL))
2395 afinfo->garbage_collect = __xfrm_garbage_collect;
2396 xfrm_policy_afinfo[afinfo->family] = afinfo;
2398 write_unlock_bh(&xfrm_policy_afinfo_lock);
2402 struct dst_ops *xfrm_dst_ops;
2404 switch (afinfo->family) {
2406 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2408 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2410 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2416 *xfrm_dst_ops = *afinfo->dst_ops;
2422 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2424 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2427 if (unlikely(afinfo == NULL))
2429 if (unlikely(afinfo->family >= NPROTO))
2430 return -EAFNOSUPPORT;
2431 write_lock_bh(&xfrm_policy_afinfo_lock);
2432 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2433 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2436 struct dst_ops *dst_ops = afinfo->dst_ops;
2437 xfrm_policy_afinfo[afinfo->family] = NULL;
2438 dst_ops->kmem_cachep = NULL;
2439 dst_ops->check = NULL;
2440 dst_ops->negative_advice = NULL;
2441 dst_ops->link_failure = NULL;
2442 afinfo->garbage_collect = NULL;
2445 write_unlock_bh(&xfrm_policy_afinfo_lock);
2448 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2450 static void __net_init xfrm_dst_ops_init(struct net *net)
2452 struct xfrm_policy_afinfo *afinfo;
2454 read_lock_bh(&xfrm_policy_afinfo_lock);
2455 afinfo = xfrm_policy_afinfo[AF_INET];
2457 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2458 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2459 afinfo = xfrm_policy_afinfo[AF_INET6];
2461 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2463 read_unlock_bh(&xfrm_policy_afinfo_lock);
2466 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2468 struct xfrm_policy_afinfo *afinfo;
2469 if (unlikely(family >= NPROTO))
2471 read_lock(&xfrm_policy_afinfo_lock);
2472 afinfo = xfrm_policy_afinfo[family];
2473 if (unlikely(!afinfo))
2474 read_unlock(&xfrm_policy_afinfo_lock);
2478 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2480 read_unlock(&xfrm_policy_afinfo_lock);
2483 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2485 struct net_device *dev = ptr;
2489 __xfrm_garbage_collect(dev_net(dev));
2494 static struct notifier_block xfrm_dev_notifier = {
2495 .notifier_call = xfrm_dev_event,
2498 #ifdef CONFIG_XFRM_STATISTICS
2499 static int __net_init xfrm_statistics_init(struct net *net)
2503 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2504 sizeof(struct linux_xfrm_mib),
2505 __alignof__(struct linux_xfrm_mib)) < 0)
2507 rv = xfrm_proc_init(net);
2509 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2513 static void xfrm_statistics_fini(struct net *net)
2515 xfrm_proc_fini(net);
2516 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2519 static int __net_init xfrm_statistics_init(struct net *net)
2524 static void xfrm_statistics_fini(struct net *net)
2529 static int __net_init xfrm_policy_init(struct net *net)
2531 unsigned int hmask, sz;
2534 if (net_eq(net, &init_net))
2535 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2536 sizeof(struct xfrm_dst),
2537 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2541 sz = (hmask+1) * sizeof(struct hlist_head);
2543 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2544 if (!net->xfrm.policy_byidx)
2546 net->xfrm.policy_idx_hmask = hmask;
2548 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2549 struct xfrm_policy_hash *htab;
2551 net->xfrm.policy_count[dir] = 0;
2552 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2554 htab = &net->xfrm.policy_bydst[dir];
2555 htab->table = xfrm_hash_alloc(sz);
2558 htab->hmask = hmask;
2561 INIT_LIST_HEAD(&net->xfrm.policy_all);
2562 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2563 if (net_eq(net, &init_net))
2564 register_netdevice_notifier(&xfrm_dev_notifier);
2568 for (dir--; dir >= 0; dir--) {
2569 struct xfrm_policy_hash *htab;
2571 htab = &net->xfrm.policy_bydst[dir];
2572 xfrm_hash_free(htab->table, sz);
2574 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2579 static void xfrm_policy_fini(struct net *net)
2581 struct xfrm_audit audit_info;
2585 flush_work(&net->xfrm.policy_hash_work);
2586 #ifdef CONFIG_XFRM_SUB_POLICY
2587 audit_info.loginuid = -1;
2588 audit_info.sessionid = -1;
2589 audit_info.secid = 0;
2590 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2592 audit_info.loginuid = -1;
2593 audit_info.sessionid = -1;
2594 audit_info.secid = 0;
2595 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2597 WARN_ON(!list_empty(&net->xfrm.policy_all));
2599 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2600 struct xfrm_policy_hash *htab;
2602 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2604 htab = &net->xfrm.policy_bydst[dir];
2605 sz = (htab->hmask + 1);
2606 WARN_ON(!hlist_empty(htab->table));
2607 xfrm_hash_free(htab->table, sz);
2610 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2611 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2612 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2615 static int __net_init xfrm_net_init(struct net *net)
2619 rv = xfrm_statistics_init(net);
2621 goto out_statistics;
2622 rv = xfrm_state_init(net);
2625 rv = xfrm_policy_init(net);
2628 xfrm_dst_ops_init(net);
2629 rv = xfrm_sysctl_init(net);
2635 xfrm_policy_fini(net);
2637 xfrm_state_fini(net);
2639 xfrm_statistics_fini(net);
2644 static void __net_exit xfrm_net_exit(struct net *net)
2646 xfrm_sysctl_fini(net);
2647 xfrm_policy_fini(net);
2648 xfrm_state_fini(net);
2649 xfrm_statistics_fini(net);
2652 static struct pernet_operations __net_initdata xfrm_net_ops = {
2653 .init = xfrm_net_init,
2654 .exit = xfrm_net_exit,
2657 void __init xfrm_init(void)
2659 register_pernet_subsys(&xfrm_net_ops);
2663 #ifdef CONFIG_AUDITSYSCALL
2664 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2665 struct audit_buffer *audit_buf)
2667 struct xfrm_sec_ctx *ctx = xp->security;
2668 struct xfrm_selector *sel = &xp->selector;
2671 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2672 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2674 switch(sel->family) {
2676 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2677 if (sel->prefixlen_s != 32)
2678 audit_log_format(audit_buf, " src_prefixlen=%d",
2680 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2681 if (sel->prefixlen_d != 32)
2682 audit_log_format(audit_buf, " dst_prefixlen=%d",
2686 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2687 if (sel->prefixlen_s != 128)
2688 audit_log_format(audit_buf, " src_prefixlen=%d",
2690 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2691 if (sel->prefixlen_d != 128)
2692 audit_log_format(audit_buf, " dst_prefixlen=%d",
2698 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2699 uid_t auid, u32 sessionid, u32 secid)
2701 struct audit_buffer *audit_buf;
2703 audit_buf = xfrm_audit_start("SPD-add");
2704 if (audit_buf == NULL)
2706 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2707 audit_log_format(audit_buf, " res=%u", result);
2708 xfrm_audit_common_policyinfo(xp, audit_buf);
2709 audit_log_end(audit_buf);
2711 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2713 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2714 uid_t auid, u32 sessionid, u32 secid)
2716 struct audit_buffer *audit_buf;
2718 audit_buf = xfrm_audit_start("SPD-delete");
2719 if (audit_buf == NULL)
2721 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2722 audit_log_format(audit_buf, " res=%u", result);
2723 xfrm_audit_common_policyinfo(xp, audit_buf);
2724 audit_log_end(audit_buf);
2726 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2729 #ifdef CONFIG_XFRM_MIGRATE
2730 static int xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
2731 const struct xfrm_selector *sel_tgt)
2733 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2734 if (sel_tgt->family == sel_cmp->family &&
2735 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2736 sel_cmp->family) == 0 &&
2737 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2738 sel_cmp->family) == 0 &&
2739 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2740 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2744 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2751 static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel,
2754 struct xfrm_policy *pol, *ret = NULL;
2755 struct hlist_node *entry;
2756 struct hlist_head *chain;
2759 read_lock_bh(&xfrm_policy_lock);
2760 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2761 hlist_for_each_entry(pol, entry, chain, bydst) {
2762 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2763 pol->type == type) {
2765 priority = ret->priority;
2769 chain = &init_net.xfrm.policy_inexact[dir];
2770 hlist_for_each_entry(pol, entry, chain, bydst) {
2771 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2772 pol->type == type &&
2773 pol->priority < priority) {
2782 read_unlock_bh(&xfrm_policy_lock);
2787 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
2791 if (t->mode == m->mode && t->id.proto == m->proto &&
2792 (m->reqid == 0 || t->reqid == m->reqid)) {
2794 case XFRM_MODE_TUNNEL:
2795 case XFRM_MODE_BEET:
2796 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2797 m->old_family) == 0 &&
2798 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2799 m->old_family) == 0) {
2803 case XFRM_MODE_TRANSPORT:
2804 /* in case of transport mode, template does not store
2805 any IP addresses, hence we just compare mode and
2816 /* update endpoint address(es) of template(s) */
2817 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2818 struct xfrm_migrate *m, int num_migrate)
2820 struct xfrm_migrate *mp;
2823 write_lock_bh(&pol->lock);
2824 if (unlikely(pol->walk.dead)) {
2825 /* target policy has been deleted */
2826 write_unlock_bh(&pol->lock);
2830 for (i = 0; i < pol->xfrm_nr; i++) {
2831 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2832 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2835 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2836 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2838 /* update endpoints */
2839 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2840 sizeof(pol->xfrm_vec[i].id.daddr));
2841 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2842 sizeof(pol->xfrm_vec[i].saddr));
2843 pol->xfrm_vec[i].encap_family = mp->new_family;
2845 atomic_inc(&pol->genid);
2849 write_unlock_bh(&pol->lock);
2857 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
2861 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2864 for (i = 0; i < num_migrate; i++) {
2865 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2866 m[i].old_family) == 0) &&
2867 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2868 m[i].old_family) == 0))
2870 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2871 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2874 /* check if there is any duplicated entry */
2875 for (j = i + 1; j < num_migrate; j++) {
2876 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2877 sizeof(m[i].old_daddr)) &&
2878 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2879 sizeof(m[i].old_saddr)) &&
2880 m[i].proto == m[j].proto &&
2881 m[i].mode == m[j].mode &&
2882 m[i].reqid == m[j].reqid &&
2883 m[i].old_family == m[j].old_family)
2891 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2892 struct xfrm_migrate *m, int num_migrate,
2893 struct xfrm_kmaddress *k)
2895 int i, err, nx_cur = 0, nx_new = 0;
2896 struct xfrm_policy *pol = NULL;
2897 struct xfrm_state *x, *xc;
2898 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2899 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2900 struct xfrm_migrate *mp;
2902 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2905 /* Stage 1 - find policy */
2906 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2911 /* Stage 2 - find and update state(s) */
2912 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2913 if ((x = xfrm_migrate_state_find(mp))) {
2916 if ((xc = xfrm_state_migrate(x, mp))) {
2926 /* Stage 3 - update policy */
2927 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2930 /* Stage 4 - delete old state(s) */
2932 xfrm_states_put(x_cur, nx_cur);
2933 xfrm_states_delete(x_cur, nx_cur);
2936 /* Stage 5 - announce */
2937 km_migrate(sel, dir, type, m, num_migrate, k);
2949 xfrm_states_put(x_cur, nx_cur);
2951 xfrm_states_delete(x_new, nx_new);
2955 EXPORT_SYMBOL(xfrm_migrate);