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>
32 #ifdef CONFIG_XFRM_STATISTICS
36 #include "xfrm_hash.h"
38 DEFINE_MUTEX(xfrm_cfg_mutex);
39 EXPORT_SYMBOL(xfrm_cfg_mutex);
41 static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock);
42 static struct dst_entry *xfrm_policy_sk_bundles;
43 static DEFINE_RWLOCK(xfrm_policy_lock);
45 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
46 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
48 static struct kmem_cache *xfrm_dst_cache __read_mostly;
50 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
51 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
52 static void xfrm_init_pmtu(struct dst_entry *dst);
53 static int stale_bundle(struct dst_entry *dst);
54 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
57 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
63 const struct flowi4 *fl4 = &fl->u.ip4;
65 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
66 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
67 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
68 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
69 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
70 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
74 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
76 const struct flowi6 *fl6 = &fl->u.ip6;
78 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
79 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
80 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
81 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
82 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
83 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
86 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
87 unsigned short family)
91 return __xfrm4_selector_match(sel, fl);
93 return __xfrm6_selector_match(sel, fl);
98 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
99 const xfrm_address_t *saddr,
100 const xfrm_address_t *daddr,
103 struct xfrm_policy_afinfo *afinfo;
104 struct dst_entry *dst;
106 afinfo = xfrm_policy_get_afinfo(family);
107 if (unlikely(afinfo == NULL))
108 return ERR_PTR(-EAFNOSUPPORT);
110 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
112 xfrm_policy_put_afinfo(afinfo);
117 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
118 xfrm_address_t *prev_saddr,
119 xfrm_address_t *prev_daddr,
122 struct net *net = xs_net(x);
123 xfrm_address_t *saddr = &x->props.saddr;
124 xfrm_address_t *daddr = &x->id.daddr;
125 struct dst_entry *dst;
127 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
131 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
136 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
139 if (prev_saddr != saddr)
140 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
141 if (prev_daddr != daddr)
142 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
148 static inline unsigned long make_jiffies(long secs)
150 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
151 return MAX_SCHEDULE_TIMEOUT-1;
156 static void xfrm_policy_timer(unsigned long data)
158 struct xfrm_policy *xp = (struct xfrm_policy*)data;
159 unsigned long now = get_seconds();
160 long next = LONG_MAX;
164 read_lock(&xp->lock);
166 if (unlikely(xp->walk.dead))
169 dir = xfrm_policy_id2dir(xp->index);
171 if (xp->lft.hard_add_expires_seconds) {
172 long tmo = xp->lft.hard_add_expires_seconds +
173 xp->curlft.add_time - now;
179 if (xp->lft.hard_use_expires_seconds) {
180 long tmo = xp->lft.hard_use_expires_seconds +
181 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
187 if (xp->lft.soft_add_expires_seconds) {
188 long tmo = xp->lft.soft_add_expires_seconds +
189 xp->curlft.add_time - now;
192 tmo = XFRM_KM_TIMEOUT;
197 if (xp->lft.soft_use_expires_seconds) {
198 long tmo = xp->lft.soft_use_expires_seconds +
199 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
202 tmo = XFRM_KM_TIMEOUT;
209 km_policy_expired(xp, dir, 0, 0);
210 if (next != LONG_MAX &&
211 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
215 read_unlock(&xp->lock);
220 read_unlock(&xp->lock);
221 if (!xfrm_policy_delete(xp, dir))
222 km_policy_expired(xp, dir, 1, 0);
226 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
228 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
230 if (unlikely(pol->walk.dead))
238 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
240 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
242 return !pol->walk.dead;
245 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
247 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
250 static const struct flow_cache_ops xfrm_policy_fc_ops = {
251 .get = xfrm_policy_flo_get,
252 .check = xfrm_policy_flo_check,
253 .delete = xfrm_policy_flo_delete,
256 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
260 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
262 struct xfrm_policy *policy;
264 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
267 write_pnet(&policy->xp_net, net);
268 INIT_LIST_HEAD(&policy->walk.all);
269 INIT_HLIST_NODE(&policy->bydst);
270 INIT_HLIST_NODE(&policy->byidx);
271 rwlock_init(&policy->lock);
272 atomic_set(&policy->refcnt, 1);
273 setup_timer(&policy->timer, xfrm_policy_timer,
274 (unsigned long)policy);
275 policy->flo.ops = &xfrm_policy_fc_ops;
279 EXPORT_SYMBOL(xfrm_policy_alloc);
281 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
283 void xfrm_policy_destroy(struct xfrm_policy *policy)
285 BUG_ON(!policy->walk.dead);
287 if (del_timer(&policy->timer))
290 security_xfrm_policy_free(policy->security);
293 EXPORT_SYMBOL(xfrm_policy_destroy);
295 /* Rule must be locked. Release descentant resources, announce
296 * entry dead. The rule must be unlinked from lists to the moment.
299 static void xfrm_policy_kill(struct xfrm_policy *policy)
301 policy->walk.dead = 1;
303 atomic_inc(&policy->genid);
305 if (del_timer(&policy->timer))
306 xfrm_pol_put(policy);
308 xfrm_pol_put(policy);
311 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
313 static inline unsigned int idx_hash(struct net *net, u32 index)
315 return __idx_hash(index, net->xfrm.policy_idx_hmask);
318 static struct hlist_head *policy_hash_bysel(struct net *net,
319 const struct xfrm_selector *sel,
320 unsigned short family, int dir)
322 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
323 unsigned int hash = __sel_hash(sel, family, hmask);
325 return (hash == hmask + 1 ?
326 &net->xfrm.policy_inexact[dir] :
327 net->xfrm.policy_bydst[dir].table + hash);
330 static struct hlist_head *policy_hash_direct(struct net *net,
331 const xfrm_address_t *daddr,
332 const xfrm_address_t *saddr,
333 unsigned short family, int dir)
335 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
336 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
338 return net->xfrm.policy_bydst[dir].table + hash;
341 static void xfrm_dst_hash_transfer(struct hlist_head *list,
342 struct hlist_head *ndsttable,
343 unsigned int nhashmask)
345 struct hlist_node *entry, *tmp, *entry0 = NULL;
346 struct xfrm_policy *pol;
350 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
353 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
354 pol->family, nhashmask);
357 hlist_add_head(&pol->bydst, ndsttable+h);
363 hlist_add_after(entry0, &pol->bydst);
367 if (!hlist_empty(list)) {
373 static void xfrm_idx_hash_transfer(struct hlist_head *list,
374 struct hlist_head *nidxtable,
375 unsigned int nhashmask)
377 struct hlist_node *entry, *tmp;
378 struct xfrm_policy *pol;
380 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
383 h = __idx_hash(pol->index, nhashmask);
384 hlist_add_head(&pol->byidx, nidxtable+h);
388 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
390 return ((old_hmask + 1) << 1) - 1;
393 static void xfrm_bydst_resize(struct net *net, int dir)
395 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
396 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
397 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
398 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
399 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
405 write_lock_bh(&xfrm_policy_lock);
407 for (i = hmask; i >= 0; i--)
408 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
410 net->xfrm.policy_bydst[dir].table = ndst;
411 net->xfrm.policy_bydst[dir].hmask = nhashmask;
413 write_unlock_bh(&xfrm_policy_lock);
415 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
418 static void xfrm_byidx_resize(struct net *net, int total)
420 unsigned int hmask = net->xfrm.policy_idx_hmask;
421 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
422 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
423 struct hlist_head *oidx = net->xfrm.policy_byidx;
424 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
430 write_lock_bh(&xfrm_policy_lock);
432 for (i = hmask; i >= 0; i--)
433 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
435 net->xfrm.policy_byidx = nidx;
436 net->xfrm.policy_idx_hmask = nhashmask;
438 write_unlock_bh(&xfrm_policy_lock);
440 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
443 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
445 unsigned int cnt = net->xfrm.policy_count[dir];
446 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
451 if ((hmask + 1) < xfrm_policy_hashmax &&
458 static inline int xfrm_byidx_should_resize(struct net *net, int total)
460 unsigned int hmask = net->xfrm.policy_idx_hmask;
462 if ((hmask + 1) < xfrm_policy_hashmax &&
469 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
471 read_lock_bh(&xfrm_policy_lock);
472 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
473 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
474 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
475 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
476 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
477 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
478 si->spdhcnt = net->xfrm.policy_idx_hmask;
479 si->spdhmcnt = xfrm_policy_hashmax;
480 read_unlock_bh(&xfrm_policy_lock);
482 EXPORT_SYMBOL(xfrm_spd_getinfo);
484 static DEFINE_MUTEX(hash_resize_mutex);
485 static void xfrm_hash_resize(struct work_struct *work)
487 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
490 mutex_lock(&hash_resize_mutex);
493 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
494 if (xfrm_bydst_should_resize(net, dir, &total))
495 xfrm_bydst_resize(net, dir);
497 if (xfrm_byidx_should_resize(net, total))
498 xfrm_byidx_resize(net, total);
500 mutex_unlock(&hash_resize_mutex);
503 /* Generate new index... KAME seems to generate them ordered by cost
504 * of an absolute inpredictability of ordering of rules. This will not pass. */
505 static u32 xfrm_gen_index(struct net *net, int dir)
507 static u32 idx_generator;
510 struct hlist_node *entry;
511 struct hlist_head *list;
512 struct xfrm_policy *p;
516 idx = (idx_generator | dir);
520 list = net->xfrm.policy_byidx + idx_hash(net, idx);
522 hlist_for_each_entry(p, entry, list, byidx) {
523 if (p->index == idx) {
533 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
535 u32 *p1 = (u32 *) s1;
536 u32 *p2 = (u32 *) s2;
537 int len = sizeof(struct xfrm_selector) / sizeof(u32);
540 for (i = 0; i < len; i++) {
548 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
550 struct net *net = xp_net(policy);
551 struct xfrm_policy *pol;
552 struct xfrm_policy *delpol;
553 struct hlist_head *chain;
554 struct hlist_node *entry, *newpos;
555 u32 mark = policy->mark.v & policy->mark.m;
557 write_lock_bh(&xfrm_policy_lock);
558 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
561 hlist_for_each_entry(pol, entry, chain, bydst) {
562 if (pol->type == policy->type &&
563 !selector_cmp(&pol->selector, &policy->selector) &&
564 (mark & pol->mark.m) == pol->mark.v &&
565 xfrm_sec_ctx_match(pol->security, policy->security) &&
568 write_unlock_bh(&xfrm_policy_lock);
572 if (policy->priority > pol->priority)
574 } else if (policy->priority >= pol->priority) {
575 newpos = &pol->bydst;
582 hlist_add_after(newpos, &policy->bydst);
584 hlist_add_head(&policy->bydst, chain);
585 xfrm_pol_hold(policy);
586 net->xfrm.policy_count[dir]++;
587 atomic_inc(&flow_cache_genid);
589 __xfrm_policy_unlink(delpol, dir);
590 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
591 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
592 policy->curlft.add_time = get_seconds();
593 policy->curlft.use_time = 0;
594 if (!mod_timer(&policy->timer, jiffies + HZ))
595 xfrm_pol_hold(policy);
596 list_add(&policy->walk.all, &net->xfrm.policy_all);
597 write_unlock_bh(&xfrm_policy_lock);
600 xfrm_policy_kill(delpol);
601 else if (xfrm_bydst_should_resize(net, dir, NULL))
602 schedule_work(&net->xfrm.policy_hash_work);
606 EXPORT_SYMBOL(xfrm_policy_insert);
608 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
609 int dir, struct xfrm_selector *sel,
610 struct xfrm_sec_ctx *ctx, int delete,
613 struct xfrm_policy *pol, *ret;
614 struct hlist_head *chain;
615 struct hlist_node *entry;
618 write_lock_bh(&xfrm_policy_lock);
619 chain = policy_hash_bysel(net, sel, sel->family, dir);
621 hlist_for_each_entry(pol, entry, chain, bydst) {
622 if (pol->type == type &&
623 (mark & pol->mark.m) == pol->mark.v &&
624 !selector_cmp(sel, &pol->selector) &&
625 xfrm_sec_ctx_match(ctx, pol->security)) {
628 *err = security_xfrm_policy_delete(
631 write_unlock_bh(&xfrm_policy_lock);
634 __xfrm_policy_unlink(pol, dir);
640 write_unlock_bh(&xfrm_policy_lock);
643 xfrm_policy_kill(ret);
646 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
648 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
649 int dir, u32 id, int delete, int *err)
651 struct xfrm_policy *pol, *ret;
652 struct hlist_head *chain;
653 struct hlist_node *entry;
656 if (xfrm_policy_id2dir(id) != dir)
660 write_lock_bh(&xfrm_policy_lock);
661 chain = net->xfrm.policy_byidx + idx_hash(net, id);
663 hlist_for_each_entry(pol, entry, chain, byidx) {
664 if (pol->type == type && pol->index == id &&
665 (mark & pol->mark.m) == pol->mark.v) {
668 *err = security_xfrm_policy_delete(
671 write_unlock_bh(&xfrm_policy_lock);
674 __xfrm_policy_unlink(pol, dir);
680 write_unlock_bh(&xfrm_policy_lock);
683 xfrm_policy_kill(ret);
686 EXPORT_SYMBOL(xfrm_policy_byid);
688 #ifdef CONFIG_SECURITY_NETWORK_XFRM
690 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
694 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
695 struct xfrm_policy *pol;
696 struct hlist_node *entry;
699 hlist_for_each_entry(pol, entry,
700 &net->xfrm.policy_inexact[dir], bydst) {
701 if (pol->type != type)
703 err = security_xfrm_policy_delete(pol->security);
705 xfrm_audit_policy_delete(pol, 0,
706 audit_info->loginuid,
707 audit_info->sessionid,
712 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
713 hlist_for_each_entry(pol, entry,
714 net->xfrm.policy_bydst[dir].table + i,
716 if (pol->type != type)
718 err = security_xfrm_policy_delete(
721 xfrm_audit_policy_delete(pol, 0,
722 audit_info->loginuid,
723 audit_info->sessionid,
734 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
740 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
742 int dir, err = 0, cnt = 0;
744 write_lock_bh(&xfrm_policy_lock);
746 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
750 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
751 struct xfrm_policy *pol;
752 struct hlist_node *entry;
756 hlist_for_each_entry(pol, entry,
757 &net->xfrm.policy_inexact[dir], bydst) {
758 if (pol->type != type)
760 __xfrm_policy_unlink(pol, dir);
761 write_unlock_bh(&xfrm_policy_lock);
764 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
765 audit_info->sessionid,
768 xfrm_policy_kill(pol);
770 write_lock_bh(&xfrm_policy_lock);
774 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
776 hlist_for_each_entry(pol, entry,
777 net->xfrm.policy_bydst[dir].table + i,
779 if (pol->type != type)
781 __xfrm_policy_unlink(pol, dir);
782 write_unlock_bh(&xfrm_policy_lock);
785 xfrm_audit_policy_delete(pol, 1,
786 audit_info->loginuid,
787 audit_info->sessionid,
789 xfrm_policy_kill(pol);
791 write_lock_bh(&xfrm_policy_lock);
800 write_unlock_bh(&xfrm_policy_lock);
803 EXPORT_SYMBOL(xfrm_policy_flush);
805 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
806 int (*func)(struct xfrm_policy *, int, int, void*),
809 struct xfrm_policy *pol;
810 struct xfrm_policy_walk_entry *x;
813 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
814 walk->type != XFRM_POLICY_TYPE_ANY)
817 if (list_empty(&walk->walk.all) && walk->seq != 0)
820 write_lock_bh(&xfrm_policy_lock);
821 if (list_empty(&walk->walk.all))
822 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
824 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
825 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
828 pol = container_of(x, struct xfrm_policy, walk);
829 if (walk->type != XFRM_POLICY_TYPE_ANY &&
830 walk->type != pol->type)
832 error = func(pol, xfrm_policy_id2dir(pol->index),
835 list_move_tail(&walk->walk.all, &x->all);
840 if (walk->seq == 0) {
844 list_del_init(&walk->walk.all);
846 write_unlock_bh(&xfrm_policy_lock);
849 EXPORT_SYMBOL(xfrm_policy_walk);
851 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
853 INIT_LIST_HEAD(&walk->walk.all);
858 EXPORT_SYMBOL(xfrm_policy_walk_init);
860 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
862 if (list_empty(&walk->walk.all))
865 write_lock_bh(&xfrm_policy_lock);
866 list_del(&walk->walk.all);
867 write_unlock_bh(&xfrm_policy_lock);
869 EXPORT_SYMBOL(xfrm_policy_walk_done);
872 * Find policy to apply to this flow.
874 * Returns 0 if policy found, else an -errno.
876 static int xfrm_policy_match(const struct xfrm_policy *pol,
877 const struct flowi *fl,
878 u8 type, u16 family, int dir)
880 const struct xfrm_selector *sel = &pol->selector;
884 if (pol->family != family ||
885 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
889 match = xfrm_selector_match(sel, fl, family);
891 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
897 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
898 const struct flowi *fl,
902 struct xfrm_policy *pol, *ret;
903 const xfrm_address_t *daddr, *saddr;
904 struct hlist_node *entry;
905 struct hlist_head *chain;
908 daddr = xfrm_flowi_daddr(fl, family);
909 saddr = xfrm_flowi_saddr(fl, family);
910 if (unlikely(!daddr || !saddr))
913 read_lock_bh(&xfrm_policy_lock);
914 chain = policy_hash_direct(net, daddr, saddr, family, dir);
916 hlist_for_each_entry(pol, entry, chain, bydst) {
917 err = xfrm_policy_match(pol, fl, type, family, dir);
927 priority = ret->priority;
931 chain = &net->xfrm.policy_inexact[dir];
932 hlist_for_each_entry(pol, entry, chain, bydst) {
933 err = xfrm_policy_match(pol, fl, type, family, dir);
941 } else if (pol->priority < priority) {
949 read_unlock_bh(&xfrm_policy_lock);
954 static struct xfrm_policy *
955 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
957 #ifdef CONFIG_XFRM_SUB_POLICY
958 struct xfrm_policy *pol;
960 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
964 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
967 static struct flow_cache_object *
968 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
969 u8 dir, struct flow_cache_object *old_obj, void *ctx)
971 struct xfrm_policy *pol;
974 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
976 pol = __xfrm_policy_lookup(net, fl, family, dir);
977 if (IS_ERR_OR_NULL(pol))
978 return ERR_CAST(pol);
980 /* Resolver returns two references:
981 * one for cache and one for caller of flow_cache_lookup() */
987 static inline int policy_to_flow_dir(int dir)
989 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
990 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
991 XFRM_POLICY_FWD == FLOW_DIR_FWD)
997 case XFRM_POLICY_OUT:
999 case XFRM_POLICY_FWD:
1000 return FLOW_DIR_FWD;
1004 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1005 const struct flowi *fl)
1007 struct xfrm_policy *pol;
1009 read_lock_bh(&xfrm_policy_lock);
1010 if ((pol = sk->sk_policy[dir]) != NULL) {
1011 bool match = xfrm_selector_match(&pol->selector, fl,
1016 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1020 err = security_xfrm_policy_lookup(pol->security,
1022 policy_to_flow_dir(dir));
1025 else if (err == -ESRCH)
1033 read_unlock_bh(&xfrm_policy_lock);
1037 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1039 struct net *net = xp_net(pol);
1040 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1043 list_add(&pol->walk.all, &net->xfrm.policy_all);
1044 hlist_add_head(&pol->bydst, chain);
1045 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1046 net->xfrm.policy_count[dir]++;
1049 if (xfrm_bydst_should_resize(net, dir, NULL))
1050 schedule_work(&net->xfrm.policy_hash_work);
1053 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1056 struct net *net = xp_net(pol);
1058 if (hlist_unhashed(&pol->bydst))
1061 hlist_del(&pol->bydst);
1062 hlist_del(&pol->byidx);
1063 list_del(&pol->walk.all);
1064 net->xfrm.policy_count[dir]--;
1069 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1071 write_lock_bh(&xfrm_policy_lock);
1072 pol = __xfrm_policy_unlink(pol, dir);
1073 write_unlock_bh(&xfrm_policy_lock);
1075 xfrm_policy_kill(pol);
1080 EXPORT_SYMBOL(xfrm_policy_delete);
1082 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1084 struct net *net = xp_net(pol);
1085 struct xfrm_policy *old_pol;
1087 #ifdef CONFIG_XFRM_SUB_POLICY
1088 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1092 write_lock_bh(&xfrm_policy_lock);
1093 old_pol = sk->sk_policy[dir];
1094 sk->sk_policy[dir] = pol;
1096 pol->curlft.add_time = get_seconds();
1097 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1098 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1101 /* Unlinking succeeds always. This is the only function
1102 * allowed to delete or replace socket policy.
1104 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1105 write_unlock_bh(&xfrm_policy_lock);
1108 xfrm_policy_kill(old_pol);
1113 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1115 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1118 newp->selector = old->selector;
1119 if (security_xfrm_policy_clone(old->security,
1122 return NULL; /* ENOMEM */
1124 newp->lft = old->lft;
1125 newp->curlft = old->curlft;
1126 newp->mark = old->mark;
1127 newp->action = old->action;
1128 newp->flags = old->flags;
1129 newp->xfrm_nr = old->xfrm_nr;
1130 newp->index = old->index;
1131 newp->type = old->type;
1132 memcpy(newp->xfrm_vec, old->xfrm_vec,
1133 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1134 write_lock_bh(&xfrm_policy_lock);
1135 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1136 write_unlock_bh(&xfrm_policy_lock);
1142 int __xfrm_sk_clone_policy(struct sock *sk)
1144 struct xfrm_policy *p0 = sk->sk_policy[0],
1145 *p1 = sk->sk_policy[1];
1147 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1148 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1150 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1156 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1157 unsigned short family)
1160 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1162 if (unlikely(afinfo == NULL))
1164 err = afinfo->get_saddr(net, local, remote);
1165 xfrm_policy_put_afinfo(afinfo);
1169 /* Resolve list of templates for the flow, given policy. */
1172 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1173 struct xfrm_state **xfrm, unsigned short family)
1175 struct net *net = xp_net(policy);
1178 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1179 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1182 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1183 struct xfrm_state *x;
1184 xfrm_address_t *remote = daddr;
1185 xfrm_address_t *local = saddr;
1186 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1188 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1189 tmpl->mode == XFRM_MODE_BEET) {
1190 remote = &tmpl->id.daddr;
1191 local = &tmpl->saddr;
1192 if (xfrm_addr_any(local, tmpl->encap_family)) {
1193 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1200 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1202 if (x && x->km.state == XFRM_STATE_VALID) {
1209 error = (x->km.state == XFRM_STATE_ERROR ?
1213 else if (error == -ESRCH)
1216 if (!tmpl->optional)
1222 for (nx--; nx>=0; nx--)
1223 xfrm_state_put(xfrm[nx]);
1228 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1229 struct xfrm_state **xfrm, unsigned short family)
1231 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1232 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1238 for (i = 0; i < npols; i++) {
1239 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1244 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1252 /* found states are sorted for outbound processing */
1254 xfrm_state_sort(xfrm, tpp, cnx, family);
1259 for (cnx--; cnx>=0; cnx--)
1260 xfrm_state_put(tpp[cnx]);
1265 /* Check that the bundle accepts the flow and its components are
1269 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1271 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1277 tos = afinfo->get_tos(fl);
1279 xfrm_policy_put_afinfo(afinfo);
1284 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1286 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1287 struct dst_entry *dst = &xdst->u.dst;
1289 if (xdst->route == NULL) {
1290 /* Dummy bundle - if it has xfrms we were not
1291 * able to build bundle as template resolution failed.
1292 * It means we need to try again resolving. */
1293 if (xdst->num_xfrms > 0)
1297 if (stale_bundle(dst))
1305 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1307 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1308 struct dst_entry *dst = &xdst->u.dst;
1312 if (stale_bundle(dst))
1318 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1320 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1321 struct dst_entry *dst = &xdst->u.dst;
1326 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1327 .get = xfrm_bundle_flo_get,
1328 .check = xfrm_bundle_flo_check,
1329 .delete = xfrm_bundle_flo_delete,
1332 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1334 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1335 struct dst_ops *dst_ops;
1336 struct xfrm_dst *xdst;
1339 return ERR_PTR(-EINVAL);
1343 dst_ops = &net->xfrm.xfrm4_dst_ops;
1345 #if IS_ENABLED(CONFIG_IPV6)
1347 dst_ops = &net->xfrm.xfrm6_dst_ops;
1353 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1356 struct dst_entry *dst = &xdst->u.dst;
1358 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1359 xdst->flo.ops = &xfrm_bundle_fc_ops;
1361 xdst = ERR_PTR(-ENOBUFS);
1363 xfrm_policy_put_afinfo(afinfo);
1368 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1371 struct xfrm_policy_afinfo *afinfo =
1372 xfrm_policy_get_afinfo(dst->ops->family);
1378 err = afinfo->init_path(path, dst, nfheader_len);
1380 xfrm_policy_put_afinfo(afinfo);
1385 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1386 const struct flowi *fl)
1388 struct xfrm_policy_afinfo *afinfo =
1389 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1395 err = afinfo->fill_dst(xdst, dev, fl);
1397 xfrm_policy_put_afinfo(afinfo);
1403 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1404 * all the metrics... Shortly, bundle a bundle.
1407 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1408 struct xfrm_state **xfrm, int nx,
1409 const struct flowi *fl,
1410 struct dst_entry *dst)
1412 struct net *net = xp_net(policy);
1413 unsigned long now = jiffies;
1414 struct net_device *dev;
1415 struct xfrm_mode *inner_mode;
1416 struct dst_entry *dst_prev = NULL;
1417 struct dst_entry *dst0 = NULL;
1421 int nfheader_len = 0;
1422 int trailer_len = 0;
1424 int family = policy->selector.family;
1425 xfrm_address_t saddr, daddr;
1427 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1429 tos = xfrm_get_tos(fl, family);
1436 for (; i < nx; i++) {
1437 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1438 struct dst_entry *dst1 = &xdst->u.dst;
1440 err = PTR_ERR(xdst);
1446 if (xfrm[i]->sel.family == AF_UNSPEC) {
1447 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1448 xfrm_af2proto(family));
1450 err = -EAFNOSUPPORT;
1455 inner_mode = xfrm[i]->inner_mode;
1460 dst_prev->child = dst_clone(dst1);
1461 dst1->flags |= DST_NOHASH;
1465 dst_copy_metrics(dst1, dst);
1467 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1468 family = xfrm[i]->props.family;
1469 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1477 dst1->xfrm = xfrm[i];
1478 xdst->xfrm_genid = xfrm[i]->genid;
1480 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1481 dst1->flags |= DST_HOST;
1482 dst1->lastuse = now;
1484 dst1->input = dst_discard;
1485 dst1->output = inner_mode->afinfo->output;
1487 dst1->next = dst_prev;
1490 header_len += xfrm[i]->props.header_len;
1491 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1492 nfheader_len += xfrm[i]->props.header_len;
1493 trailer_len += xfrm[i]->props.trailer_len;
1496 dst_prev->child = dst;
1504 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1505 xfrm_init_pmtu(dst_prev);
1507 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1508 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1510 err = xfrm_fill_dst(xdst, dev, fl);
1514 dst_prev->header_len = header_len;
1515 dst_prev->trailer_len = trailer_len;
1516 header_len -= xdst->u.dst.xfrm->props.header_len;
1517 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1525 xfrm_state_put(xfrm[i]);
1529 dst0 = ERR_PTR(err);
1534 xfrm_dst_alloc_copy(void **target, const void *src, int size)
1537 *target = kmalloc(size, GFP_ATOMIC);
1541 memcpy(*target, src, size);
1546 xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel)
1548 #ifdef CONFIG_XFRM_SUB_POLICY
1549 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1550 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1558 xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl)
1560 #ifdef CONFIG_XFRM_SUB_POLICY
1561 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1562 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1568 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1569 struct xfrm_policy **pols,
1570 int *num_pols, int *num_xfrms)
1574 if (*num_pols == 0 || !pols[0]) {
1579 if (IS_ERR(pols[0]))
1580 return PTR_ERR(pols[0]);
1582 *num_xfrms = pols[0]->xfrm_nr;
1584 #ifdef CONFIG_XFRM_SUB_POLICY
1585 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1586 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1587 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1588 XFRM_POLICY_TYPE_MAIN,
1592 if (IS_ERR(pols[1])) {
1593 xfrm_pols_put(pols, *num_pols);
1594 return PTR_ERR(pols[1]);
1597 (*num_xfrms) += pols[1]->xfrm_nr;
1601 for (i = 0; i < *num_pols; i++) {
1602 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1612 static struct xfrm_dst *
1613 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1614 const struct flowi *fl, u16 family,
1615 struct dst_entry *dst_orig)
1617 struct net *net = xp_net(pols[0]);
1618 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1619 struct dst_entry *dst;
1620 struct xfrm_dst *xdst;
1623 /* Try to instantiate a bundle */
1624 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1626 if (err != 0 && err != -EAGAIN)
1627 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1628 return ERR_PTR(err);
1631 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1633 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1634 return ERR_CAST(dst);
1637 xdst = (struct xfrm_dst *)dst;
1638 xdst->num_xfrms = err;
1640 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1642 err = xfrm_dst_update_origin(dst, fl);
1643 if (unlikely(err)) {
1645 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1646 return ERR_PTR(err);
1649 xdst->num_pols = num_pols;
1650 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1651 xdst->policy_genid = atomic_read(&pols[0]->genid);
1656 static struct flow_cache_object *
1657 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1658 struct flow_cache_object *oldflo, void *ctx)
1660 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1661 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1662 struct xfrm_dst *xdst, *new_xdst;
1663 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1665 /* Check if the policies from old bundle are usable */
1668 xdst = container_of(oldflo, struct xfrm_dst, flo);
1669 num_pols = xdst->num_pols;
1670 num_xfrms = xdst->num_xfrms;
1672 for (i = 0; i < num_pols; i++) {
1673 pols[i] = xdst->pols[i];
1674 pol_dead |= pols[i]->walk.dead;
1677 dst_free(&xdst->u.dst);
1685 /* Resolve policies to use if we couldn't get them from
1686 * previous cache entry */
1689 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1690 err = xfrm_expand_policies(fl, family, pols,
1691 &num_pols, &num_xfrms);
1697 goto make_dummy_bundle;
1700 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1701 if (IS_ERR(new_xdst)) {
1702 err = PTR_ERR(new_xdst);
1706 goto make_dummy_bundle;
1707 dst_hold(&xdst->u.dst);
1709 } else if (new_xdst == NULL) {
1712 goto make_dummy_bundle;
1713 xdst->num_xfrms = 0;
1714 dst_hold(&xdst->u.dst);
1718 /* Kill the previous bundle */
1720 /* The policies were stolen for newly generated bundle */
1722 dst_free(&xdst->u.dst);
1725 /* Flow cache does not have reference, it dst_free()'s,
1726 * but we do need to return one reference for original caller */
1727 dst_hold(&new_xdst->u.dst);
1728 return &new_xdst->flo;
1731 /* We found policies, but there's no bundles to instantiate:
1732 * either because the policy blocks, has no transformations or
1733 * we could not build template (no xfrm_states).*/
1734 xdst = xfrm_alloc_dst(net, family);
1736 xfrm_pols_put(pols, num_pols);
1737 return ERR_CAST(xdst);
1739 xdst->num_pols = num_pols;
1740 xdst->num_xfrms = num_xfrms;
1741 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1743 dst_hold(&xdst->u.dst);
1747 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1750 dst_free(&xdst->u.dst);
1752 xfrm_pols_put(pols, num_pols);
1753 return ERR_PTR(err);
1756 static struct dst_entry *make_blackhole(struct net *net, u16 family,
1757 struct dst_entry *dst_orig)
1759 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1760 struct dst_entry *ret;
1763 dst_release(dst_orig);
1764 ret = ERR_PTR(-EINVAL);
1766 ret = afinfo->blackhole_route(net, dst_orig);
1768 xfrm_policy_put_afinfo(afinfo);
1773 /* Main function: finds/creates a bundle for given flow.
1775 * At the moment we eat a raw IP route. Mostly to speed up lookups
1776 * on interfaces with disabled IPsec.
1778 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
1779 const struct flowi *fl,
1780 struct sock *sk, int flags)
1782 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1783 struct flow_cache_object *flo;
1784 struct xfrm_dst *xdst;
1785 struct dst_entry *dst, *route;
1786 u16 family = dst_orig->ops->family;
1787 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1788 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1795 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1797 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1798 err = xfrm_expand_policies(fl, family, pols,
1799 &num_pols, &num_xfrms);
1804 if (num_xfrms <= 0) {
1805 drop_pols = num_pols;
1809 xdst = xfrm_resolve_and_create_bundle(
1813 xfrm_pols_put(pols, num_pols);
1814 err = PTR_ERR(xdst);
1816 } else if (xdst == NULL) {
1818 drop_pols = num_pols;
1822 dst_hold(&xdst->u.dst);
1824 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1825 xdst->u.dst.next = xfrm_policy_sk_bundles;
1826 xfrm_policy_sk_bundles = &xdst->u.dst;
1827 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1829 route = xdst->route;
1834 /* To accelerate a bit... */
1835 if ((dst_orig->flags & DST_NOXFRM) ||
1836 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1839 flo = flow_cache_lookup(net, fl, family, dir,
1840 xfrm_bundle_lookup, dst_orig);
1847 xdst = container_of(flo, struct xfrm_dst, flo);
1849 num_pols = xdst->num_pols;
1850 num_xfrms = xdst->num_xfrms;
1851 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1852 route = xdst->route;
1856 if (route == NULL && num_xfrms > 0) {
1857 /* The only case when xfrm_bundle_lookup() returns a
1858 * bundle with null route, is when the template could
1859 * not be resolved. It means policies are there, but
1860 * bundle could not be created, since we don't yet
1861 * have the xfrm_state's. We need to wait for KM to
1862 * negotiate new SA's or bail out with error.*/
1863 if (net->xfrm.sysctl_larval_drop) {
1864 /* EREMOTE tells the caller to generate
1865 * a one-shot blackhole route. */
1867 xfrm_pols_put(pols, drop_pols);
1868 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1870 return make_blackhole(net, family, dst_orig);
1872 if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) {
1873 DECLARE_WAITQUEUE(wait, current);
1875 add_wait_queue(&net->xfrm.km_waitq, &wait);
1876 set_current_state(TASK_INTERRUPTIBLE);
1878 set_current_state(TASK_RUNNING);
1879 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1881 if (!signal_pending(current)) {
1890 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1898 if ((flags & XFRM_LOOKUP_ICMP) &&
1899 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1904 for (i = 0; i < num_pols; i++)
1905 pols[i]->curlft.use_time = get_seconds();
1907 if (num_xfrms < 0) {
1908 /* Prohibit the flow */
1909 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1912 } else if (num_xfrms > 0) {
1913 /* Flow transformed */
1914 dst_release(dst_orig);
1916 /* Flow passes untransformed */
1921 xfrm_pols_put(pols, drop_pols);
1922 if (dst && dst->xfrm &&
1923 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
1924 dst->flags |= DST_XFRM_TUNNEL;
1928 if (!(flags & XFRM_LOOKUP_ICMP)) {
1936 dst_release(dst_orig);
1937 xfrm_pols_put(pols, drop_pols);
1938 return ERR_PTR(err);
1940 EXPORT_SYMBOL(xfrm_lookup);
1943 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
1945 struct xfrm_state *x;
1947 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1949 x = skb->sp->xvec[idx];
1950 if (!x->type->reject)
1952 return x->type->reject(x, skb, fl);
1955 /* When skb is transformed back to its "native" form, we have to
1956 * check policy restrictions. At the moment we make this in maximally
1957 * stupid way. Shame on me. :-) Of course, connected sockets must
1958 * have policy cached at them.
1962 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1963 unsigned short family)
1965 if (xfrm_state_kern(x))
1966 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1967 return x->id.proto == tmpl->id.proto &&
1968 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1969 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1970 x->props.mode == tmpl->mode &&
1971 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1972 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1973 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1974 xfrm_state_addr_cmp(tmpl, x, family));
1978 * 0 or more than 0 is returned when validation is succeeded (either bypass
1979 * because of optional transport mode, or next index of the mathced secpath
1980 * state with the template.
1981 * -1 is returned when no matching template is found.
1982 * Otherwise "-2 - errored_index" is returned.
1985 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1986 unsigned short family)
1990 if (tmpl->optional) {
1991 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1995 for (; idx < sp->len; idx++) {
1996 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1998 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2007 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2008 unsigned int family, int reverse)
2010 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2013 if (unlikely(afinfo == NULL))
2014 return -EAFNOSUPPORT;
2016 afinfo->decode_session(skb, fl, reverse);
2017 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2018 xfrm_policy_put_afinfo(afinfo);
2021 EXPORT_SYMBOL(__xfrm_decode_session);
2023 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2025 for (; k < sp->len; k++) {
2026 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2035 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2036 unsigned short family)
2038 struct net *net = dev_net(skb->dev);
2039 struct xfrm_policy *pol;
2040 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2049 reverse = dir & ~XFRM_POLICY_MASK;
2050 dir &= XFRM_POLICY_MASK;
2051 fl_dir = policy_to_flow_dir(dir);
2053 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2054 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2058 nf_nat_decode_session(skb, &fl, family);
2060 /* First, check used SA against their selectors. */
2064 for (i=skb->sp->len-1; i>=0; i--) {
2065 struct xfrm_state *x = skb->sp->xvec[i];
2066 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2067 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2074 if (sk && sk->sk_policy[dir]) {
2075 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2077 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2083 struct flow_cache_object *flo;
2085 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2086 xfrm_policy_lookup, NULL);
2087 if (IS_ERR_OR_NULL(flo))
2088 pol = ERR_CAST(flo);
2090 pol = container_of(flo, struct xfrm_policy, flo);
2094 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2099 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2100 xfrm_secpath_reject(xerr_idx, skb, &fl);
2101 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2107 pol->curlft.use_time = get_seconds();
2111 #ifdef CONFIG_XFRM_SUB_POLICY
2112 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2113 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2117 if (IS_ERR(pols[1])) {
2118 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2121 pols[1]->curlft.use_time = get_seconds();
2127 if (pol->action == XFRM_POLICY_ALLOW) {
2128 struct sec_path *sp;
2129 static struct sec_path dummy;
2130 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2131 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2132 struct xfrm_tmpl **tpp = tp;
2136 if ((sp = skb->sp) == NULL)
2139 for (pi = 0; pi < npols; pi++) {
2140 if (pols[pi] != pol &&
2141 pols[pi]->action != XFRM_POLICY_ALLOW) {
2142 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2145 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2146 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2149 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2150 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2154 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2158 /* For each tunnel xfrm, find the first matching tmpl.
2159 * For each tmpl before that, find corresponding xfrm.
2160 * Order is _important_. Later we will implement
2161 * some barriers, but at the moment barriers
2162 * are implied between each two transformations.
2164 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2165 k = xfrm_policy_ok(tpp[i], sp, k, family);
2168 /* "-2 - errored_index" returned */
2170 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2175 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2176 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2180 xfrm_pols_put(pols, npols);
2183 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2186 xfrm_secpath_reject(xerr_idx, skb, &fl);
2188 xfrm_pols_put(pols, npols);
2191 EXPORT_SYMBOL(__xfrm_policy_check);
2193 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2195 struct net *net = dev_net(skb->dev);
2197 struct dst_entry *dst;
2200 if (xfrm_decode_session(skb, &fl, family) < 0) {
2201 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2207 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2212 skb_dst_set(skb, dst);
2215 EXPORT_SYMBOL(__xfrm_route_forward);
2217 /* Optimize later using cookies and generation ids. */
2219 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2221 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2222 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2223 * get validated by dst_ops->check on every use. We do this
2224 * because when a normal route referenced by an XFRM dst is
2225 * obsoleted we do not go looking around for all parent
2226 * referencing XFRM dsts so that we can invalidate them. It
2227 * is just too much work. Instead we make the checks here on
2228 * every use. For example:
2230 * XFRM dst A --> IPv4 dst X
2232 * X is the "xdst->route" of A (X is also the "dst->path" of A
2233 * in this example). If X is marked obsolete, "A" will not
2234 * notice. That's what we are validating here via the
2235 * stale_bundle() check.
2237 * When a policy's bundle is pruned, we dst_free() the XFRM
2238 * dst which causes it's ->obsolete field to be set to
2239 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2240 * this, we want to force a new route lookup.
2242 if (dst->obsolete < 0 && !stale_bundle(dst))
2248 static int stale_bundle(struct dst_entry *dst)
2250 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2253 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2255 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2256 dst->dev = dev_net(dev)->loopback_dev;
2261 EXPORT_SYMBOL(xfrm_dst_ifdown);
2263 static void xfrm_link_failure(struct sk_buff *skb)
2265 /* Impossible. Such dst must be popped before reaches point of failure. */
2268 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2271 if (dst->obsolete) {
2279 static void __xfrm_garbage_collect(struct net *net)
2281 struct dst_entry *head, *next;
2283 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2284 head = xfrm_policy_sk_bundles;
2285 xfrm_policy_sk_bundles = NULL;
2286 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2295 static void xfrm_garbage_collect(struct net *net)
2298 __xfrm_garbage_collect(net);
2301 static void xfrm_garbage_collect_deferred(struct net *net)
2303 flow_cache_flush_deferred();
2304 __xfrm_garbage_collect(net);
2307 static void xfrm_init_pmtu(struct dst_entry *dst)
2310 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2311 u32 pmtu, route_mtu_cached;
2313 pmtu = dst_mtu(dst->child);
2314 xdst->child_mtu_cached = pmtu;
2316 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2318 route_mtu_cached = dst_mtu(xdst->route);
2319 xdst->route_mtu_cached = route_mtu_cached;
2321 if (pmtu > route_mtu_cached)
2322 pmtu = route_mtu_cached;
2324 dst_metric_set(dst, RTAX_MTU, pmtu);
2325 } while ((dst = dst->next));
2328 /* Check that the bundle accepts the flow and its components are
2332 static int xfrm_bundle_ok(struct xfrm_dst *first)
2334 struct dst_entry *dst = &first->u.dst;
2335 struct xfrm_dst *last;
2338 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2339 (dst->dev && !netif_running(dst->dev)))
2345 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2347 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2349 if (xdst->xfrm_genid != dst->xfrm->genid)
2351 if (xdst->num_pols > 0 &&
2352 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2355 mtu = dst_mtu(dst->child);
2356 if (xdst->child_mtu_cached != mtu) {
2358 xdst->child_mtu_cached = mtu;
2361 if (!dst_check(xdst->route, xdst->route_cookie))
2363 mtu = dst_mtu(xdst->route);
2364 if (xdst->route_mtu_cached != mtu) {
2366 xdst->route_mtu_cached = mtu;
2370 } while (dst->xfrm);
2375 mtu = last->child_mtu_cached;
2379 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2380 if (mtu > last->route_mtu_cached)
2381 mtu = last->route_mtu_cached;
2382 dst_metric_set(dst, RTAX_MTU, mtu);
2387 last = (struct xfrm_dst *)last->u.dst.next;
2388 last->child_mtu_cached = mtu;
2394 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2396 return dst_metric_advmss(dst->path);
2399 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2401 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2403 return mtu ? : dst_mtu(dst->path);
2406 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2407 struct sk_buff *skb,
2410 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2413 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2417 if (unlikely(afinfo == NULL))
2419 if (unlikely(afinfo->family >= NPROTO))
2420 return -EAFNOSUPPORT;
2421 write_lock_bh(&xfrm_policy_afinfo_lock);
2422 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2425 struct dst_ops *dst_ops = afinfo->dst_ops;
2426 if (likely(dst_ops->kmem_cachep == NULL))
2427 dst_ops->kmem_cachep = xfrm_dst_cache;
2428 if (likely(dst_ops->check == NULL))
2429 dst_ops->check = xfrm_dst_check;
2430 if (likely(dst_ops->default_advmss == NULL))
2431 dst_ops->default_advmss = xfrm_default_advmss;
2432 if (likely(dst_ops->mtu == NULL))
2433 dst_ops->mtu = xfrm_mtu;
2434 if (likely(dst_ops->negative_advice == NULL))
2435 dst_ops->negative_advice = xfrm_negative_advice;
2436 if (likely(dst_ops->link_failure == NULL))
2437 dst_ops->link_failure = xfrm_link_failure;
2438 if (likely(dst_ops->neigh_lookup == NULL))
2439 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2440 if (likely(afinfo->garbage_collect == NULL))
2441 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2442 xfrm_policy_afinfo[afinfo->family] = afinfo;
2444 write_unlock_bh(&xfrm_policy_afinfo_lock);
2448 struct dst_ops *xfrm_dst_ops;
2450 switch (afinfo->family) {
2452 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2454 #if IS_ENABLED(CONFIG_IPV6)
2456 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2462 *xfrm_dst_ops = *afinfo->dst_ops;
2468 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2470 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2473 if (unlikely(afinfo == NULL))
2475 if (unlikely(afinfo->family >= NPROTO))
2476 return -EAFNOSUPPORT;
2477 write_lock_bh(&xfrm_policy_afinfo_lock);
2478 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2479 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2482 struct dst_ops *dst_ops = afinfo->dst_ops;
2483 xfrm_policy_afinfo[afinfo->family] = NULL;
2484 dst_ops->kmem_cachep = NULL;
2485 dst_ops->check = NULL;
2486 dst_ops->negative_advice = NULL;
2487 dst_ops->link_failure = NULL;
2488 afinfo->garbage_collect = NULL;
2491 write_unlock_bh(&xfrm_policy_afinfo_lock);
2494 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2496 static void __net_init xfrm_dst_ops_init(struct net *net)
2498 struct xfrm_policy_afinfo *afinfo;
2500 read_lock_bh(&xfrm_policy_afinfo_lock);
2501 afinfo = xfrm_policy_afinfo[AF_INET];
2503 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2504 #if IS_ENABLED(CONFIG_IPV6)
2505 afinfo = xfrm_policy_afinfo[AF_INET6];
2507 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2509 read_unlock_bh(&xfrm_policy_afinfo_lock);
2512 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2514 struct xfrm_policy_afinfo *afinfo;
2515 if (unlikely(family >= NPROTO))
2517 read_lock(&xfrm_policy_afinfo_lock);
2518 afinfo = xfrm_policy_afinfo[family];
2519 if (unlikely(!afinfo))
2520 read_unlock(&xfrm_policy_afinfo_lock);
2524 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2526 read_unlock(&xfrm_policy_afinfo_lock);
2529 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2531 struct net_device *dev = ptr;
2535 xfrm_garbage_collect(dev_net(dev));
2540 static struct notifier_block xfrm_dev_notifier = {
2541 .notifier_call = xfrm_dev_event,
2544 #ifdef CONFIG_XFRM_STATISTICS
2545 static int __net_init xfrm_statistics_init(struct net *net)
2549 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2550 sizeof(struct linux_xfrm_mib),
2551 __alignof__(struct linux_xfrm_mib)) < 0)
2553 rv = xfrm_proc_init(net);
2555 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2559 static void xfrm_statistics_fini(struct net *net)
2561 xfrm_proc_fini(net);
2562 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2565 static int __net_init xfrm_statistics_init(struct net *net)
2570 static void xfrm_statistics_fini(struct net *net)
2575 static int __net_init xfrm_policy_init(struct net *net)
2577 unsigned int hmask, sz;
2580 if (net_eq(net, &init_net))
2581 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2582 sizeof(struct xfrm_dst),
2583 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2587 sz = (hmask+1) * sizeof(struct hlist_head);
2589 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2590 if (!net->xfrm.policy_byidx)
2592 net->xfrm.policy_idx_hmask = hmask;
2594 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2595 struct xfrm_policy_hash *htab;
2597 net->xfrm.policy_count[dir] = 0;
2598 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2600 htab = &net->xfrm.policy_bydst[dir];
2601 htab->table = xfrm_hash_alloc(sz);
2604 htab->hmask = hmask;
2607 INIT_LIST_HEAD(&net->xfrm.policy_all);
2608 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2609 if (net_eq(net, &init_net))
2610 register_netdevice_notifier(&xfrm_dev_notifier);
2614 for (dir--; dir >= 0; dir--) {
2615 struct xfrm_policy_hash *htab;
2617 htab = &net->xfrm.policy_bydst[dir];
2618 xfrm_hash_free(htab->table, sz);
2620 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2625 static void xfrm_policy_fini(struct net *net)
2627 struct xfrm_audit audit_info;
2631 flush_work(&net->xfrm.policy_hash_work);
2632 #ifdef CONFIG_XFRM_SUB_POLICY
2633 audit_info.loginuid = -1;
2634 audit_info.sessionid = -1;
2635 audit_info.secid = 0;
2636 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2638 audit_info.loginuid = -1;
2639 audit_info.sessionid = -1;
2640 audit_info.secid = 0;
2641 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2643 WARN_ON(!list_empty(&net->xfrm.policy_all));
2645 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2646 struct xfrm_policy_hash *htab;
2648 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2650 htab = &net->xfrm.policy_bydst[dir];
2651 sz = (htab->hmask + 1);
2652 WARN_ON(!hlist_empty(htab->table));
2653 xfrm_hash_free(htab->table, sz);
2656 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2657 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2658 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2661 static int __net_init xfrm_net_init(struct net *net)
2665 rv = xfrm_statistics_init(net);
2667 goto out_statistics;
2668 rv = xfrm_state_init(net);
2671 rv = xfrm_policy_init(net);
2674 xfrm_dst_ops_init(net);
2675 rv = xfrm_sysctl_init(net);
2681 xfrm_policy_fini(net);
2683 xfrm_state_fini(net);
2685 xfrm_statistics_fini(net);
2690 static void __net_exit xfrm_net_exit(struct net *net)
2692 xfrm_sysctl_fini(net);
2693 xfrm_policy_fini(net);
2694 xfrm_state_fini(net);
2695 xfrm_statistics_fini(net);
2698 static struct pernet_operations __net_initdata xfrm_net_ops = {
2699 .init = xfrm_net_init,
2700 .exit = xfrm_net_exit,
2703 void __init xfrm_init(void)
2705 register_pernet_subsys(&xfrm_net_ops);
2709 #ifdef CONFIG_AUDITSYSCALL
2710 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2711 struct audit_buffer *audit_buf)
2713 struct xfrm_sec_ctx *ctx = xp->security;
2714 struct xfrm_selector *sel = &xp->selector;
2717 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2718 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2720 switch(sel->family) {
2722 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2723 if (sel->prefixlen_s != 32)
2724 audit_log_format(audit_buf, " src_prefixlen=%d",
2726 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2727 if (sel->prefixlen_d != 32)
2728 audit_log_format(audit_buf, " dst_prefixlen=%d",
2732 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2733 if (sel->prefixlen_s != 128)
2734 audit_log_format(audit_buf, " src_prefixlen=%d",
2736 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2737 if (sel->prefixlen_d != 128)
2738 audit_log_format(audit_buf, " dst_prefixlen=%d",
2744 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2745 uid_t auid, u32 sessionid, u32 secid)
2747 struct audit_buffer *audit_buf;
2749 audit_buf = xfrm_audit_start("SPD-add");
2750 if (audit_buf == NULL)
2752 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2753 audit_log_format(audit_buf, " res=%u", result);
2754 xfrm_audit_common_policyinfo(xp, audit_buf);
2755 audit_log_end(audit_buf);
2757 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2759 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2760 uid_t auid, u32 sessionid, u32 secid)
2762 struct audit_buffer *audit_buf;
2764 audit_buf = xfrm_audit_start("SPD-delete");
2765 if (audit_buf == NULL)
2767 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2768 audit_log_format(audit_buf, " res=%u", result);
2769 xfrm_audit_common_policyinfo(xp, audit_buf);
2770 audit_log_end(audit_buf);
2772 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2775 #ifdef CONFIG_XFRM_MIGRATE
2776 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
2777 const struct xfrm_selector *sel_tgt)
2779 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2780 if (sel_tgt->family == sel_cmp->family &&
2781 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2782 sel_cmp->family) == 0 &&
2783 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2784 sel_cmp->family) == 0 &&
2785 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2786 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2790 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2797 static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel,
2800 struct xfrm_policy *pol, *ret = NULL;
2801 struct hlist_node *entry;
2802 struct hlist_head *chain;
2805 read_lock_bh(&xfrm_policy_lock);
2806 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2807 hlist_for_each_entry(pol, entry, chain, bydst) {
2808 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2809 pol->type == type) {
2811 priority = ret->priority;
2815 chain = &init_net.xfrm.policy_inexact[dir];
2816 hlist_for_each_entry(pol, entry, chain, bydst) {
2817 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2818 pol->type == type &&
2819 pol->priority < priority) {
2828 read_unlock_bh(&xfrm_policy_lock);
2833 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
2837 if (t->mode == m->mode && t->id.proto == m->proto &&
2838 (m->reqid == 0 || t->reqid == m->reqid)) {
2840 case XFRM_MODE_TUNNEL:
2841 case XFRM_MODE_BEET:
2842 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2843 m->old_family) == 0 &&
2844 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2845 m->old_family) == 0) {
2849 case XFRM_MODE_TRANSPORT:
2850 /* in case of transport mode, template does not store
2851 any IP addresses, hence we just compare mode and
2862 /* update endpoint address(es) of template(s) */
2863 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2864 struct xfrm_migrate *m, int num_migrate)
2866 struct xfrm_migrate *mp;
2869 write_lock_bh(&pol->lock);
2870 if (unlikely(pol->walk.dead)) {
2871 /* target policy has been deleted */
2872 write_unlock_bh(&pol->lock);
2876 for (i = 0; i < pol->xfrm_nr; i++) {
2877 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2878 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2881 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2882 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2884 /* update endpoints */
2885 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2886 sizeof(pol->xfrm_vec[i].id.daddr));
2887 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2888 sizeof(pol->xfrm_vec[i].saddr));
2889 pol->xfrm_vec[i].encap_family = mp->new_family;
2891 atomic_inc(&pol->genid);
2895 write_unlock_bh(&pol->lock);
2903 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
2907 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2910 for (i = 0; i < num_migrate; i++) {
2911 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2912 m[i].old_family) == 0) &&
2913 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2914 m[i].old_family) == 0))
2916 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2917 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2920 /* check if there is any duplicated entry */
2921 for (j = i + 1; j < num_migrate; j++) {
2922 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2923 sizeof(m[i].old_daddr)) &&
2924 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2925 sizeof(m[i].old_saddr)) &&
2926 m[i].proto == m[j].proto &&
2927 m[i].mode == m[j].mode &&
2928 m[i].reqid == m[j].reqid &&
2929 m[i].old_family == m[j].old_family)
2937 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2938 struct xfrm_migrate *m, int num_migrate,
2939 struct xfrm_kmaddress *k)
2941 int i, err, nx_cur = 0, nx_new = 0;
2942 struct xfrm_policy *pol = NULL;
2943 struct xfrm_state *x, *xc;
2944 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2945 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2946 struct xfrm_migrate *mp;
2948 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2951 /* Stage 1 - find policy */
2952 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2957 /* Stage 2 - find and update state(s) */
2958 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2959 if ((x = xfrm_migrate_state_find(mp))) {
2962 if ((xc = xfrm_state_migrate(x, mp))) {
2972 /* Stage 3 - update policy */
2973 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2976 /* Stage 4 - delete old state(s) */
2978 xfrm_states_put(x_cur, nx_cur);
2979 xfrm_states_delete(x_cur, nx_cur);
2982 /* Stage 5 - announce */
2983 km_migrate(sel, dir, type, m, num_migrate, k);
2995 xfrm_states_put(x_cur, nx_cur);
2997 xfrm_states_delete(x_new, nx_new);
3001 EXPORT_SYMBOL(xfrm_migrate);