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/slab.h>
17 #include <linux/kmod.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/workqueue.h>
21 #include <linux/notifier.h>
22 #include <linux/netdevice.h>
23 #include <linux/netfilter.h>
24 #include <linux/module.h>
25 #include <linux/cache.h>
28 #include <linux/audit.h>
30 #include "xfrm_hash.h"
32 DEFINE_MUTEX(xfrm_cfg_mutex);
33 EXPORT_SYMBOL(xfrm_cfg_mutex);
35 static DEFINE_RWLOCK(xfrm_policy_lock);
37 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
38 EXPORT_SYMBOL(xfrm_policy_count);
40 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
41 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
43 static struct kmem_cache *xfrm_dst_cache __read_mostly;
45 static struct work_struct xfrm_policy_gc_work;
46 static HLIST_HEAD(xfrm_policy_gc_list);
47 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
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 struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
52 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
55 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
57 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
58 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
59 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
60 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
61 (fl->proto == sel->proto || !sel->proto) &&
62 (fl->oif == sel->ifindex || !sel->ifindex);
66 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
68 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
69 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
70 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
71 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
72 (fl->proto == sel->proto || !sel->proto) &&
73 (fl->oif == sel->ifindex || !sel->ifindex);
76 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
77 unsigned short family)
81 return __xfrm4_selector_match(sel, fl);
83 return __xfrm6_selector_match(sel, fl);
88 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
90 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
91 struct xfrm_type **typemap;
94 if (unlikely(afinfo == NULL))
96 typemap = afinfo->type_map;
98 if (likely(typemap[type->proto] == NULL))
99 typemap[type->proto] = type;
102 xfrm_policy_unlock_afinfo(afinfo);
105 EXPORT_SYMBOL(xfrm_register_type);
107 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
109 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
110 struct xfrm_type **typemap;
113 if (unlikely(afinfo == NULL))
114 return -EAFNOSUPPORT;
115 typemap = afinfo->type_map;
117 if (unlikely(typemap[type->proto] != type))
120 typemap[type->proto] = NULL;
121 xfrm_policy_unlock_afinfo(afinfo);
124 EXPORT_SYMBOL(xfrm_unregister_type);
126 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
128 struct xfrm_policy_afinfo *afinfo;
129 struct xfrm_type **typemap;
130 struct xfrm_type *type;
131 int modload_attempted = 0;
134 afinfo = xfrm_policy_get_afinfo(family);
135 if (unlikely(afinfo == NULL))
137 typemap = afinfo->type_map;
139 type = typemap[proto];
140 if (unlikely(type && !try_module_get(type->owner)))
142 if (!type && !modload_attempted) {
143 xfrm_policy_put_afinfo(afinfo);
144 request_module("xfrm-type-%d-%d",
145 (int) family, (int) proto);
146 modload_attempted = 1;
150 xfrm_policy_put_afinfo(afinfo);
154 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
155 unsigned short family)
157 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
160 if (unlikely(afinfo == NULL))
161 return -EAFNOSUPPORT;
163 if (likely(afinfo->dst_lookup != NULL))
164 err = afinfo->dst_lookup(dst, fl);
167 xfrm_policy_put_afinfo(afinfo);
170 EXPORT_SYMBOL(xfrm_dst_lookup);
172 void xfrm_put_type(struct xfrm_type *type)
174 module_put(type->owner);
177 int xfrm_register_mode(struct xfrm_mode *mode, int family)
179 struct xfrm_policy_afinfo *afinfo;
180 struct xfrm_mode **modemap;
183 if (unlikely(mode->encap >= XFRM_MODE_MAX))
186 afinfo = xfrm_policy_lock_afinfo(family);
187 if (unlikely(afinfo == NULL))
188 return -EAFNOSUPPORT;
191 modemap = afinfo->mode_map;
192 if (likely(modemap[mode->encap] == NULL)) {
193 modemap[mode->encap] = mode;
197 xfrm_policy_unlock_afinfo(afinfo);
200 EXPORT_SYMBOL(xfrm_register_mode);
202 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
204 struct xfrm_policy_afinfo *afinfo;
205 struct xfrm_mode **modemap;
208 if (unlikely(mode->encap >= XFRM_MODE_MAX))
211 afinfo = xfrm_policy_lock_afinfo(family);
212 if (unlikely(afinfo == NULL))
213 return -EAFNOSUPPORT;
216 modemap = afinfo->mode_map;
217 if (likely(modemap[mode->encap] == mode)) {
218 modemap[mode->encap] = NULL;
222 xfrm_policy_unlock_afinfo(afinfo);
225 EXPORT_SYMBOL(xfrm_unregister_mode);
227 struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
229 struct xfrm_policy_afinfo *afinfo;
230 struct xfrm_mode *mode;
231 int modload_attempted = 0;
233 if (unlikely(encap >= XFRM_MODE_MAX))
237 afinfo = xfrm_policy_get_afinfo(family);
238 if (unlikely(afinfo == NULL))
241 mode = afinfo->mode_map[encap];
242 if (unlikely(mode && !try_module_get(mode->owner)))
244 if (!mode && !modload_attempted) {
245 xfrm_policy_put_afinfo(afinfo);
246 request_module("xfrm-mode-%d-%d", family, encap);
247 modload_attempted = 1;
251 xfrm_policy_put_afinfo(afinfo);
255 void xfrm_put_mode(struct xfrm_mode *mode)
257 module_put(mode->owner);
260 static inline unsigned long make_jiffies(long secs)
262 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
263 return MAX_SCHEDULE_TIMEOUT-1;
268 static void xfrm_policy_timer(unsigned long data)
270 struct xfrm_policy *xp = (struct xfrm_policy*)data;
271 unsigned long now = (unsigned long)xtime.tv_sec;
272 long next = LONG_MAX;
276 read_lock(&xp->lock);
281 dir = xfrm_policy_id2dir(xp->index);
283 if (xp->lft.hard_add_expires_seconds) {
284 long tmo = xp->lft.hard_add_expires_seconds +
285 xp->curlft.add_time - now;
291 if (xp->lft.hard_use_expires_seconds) {
292 long tmo = xp->lft.hard_use_expires_seconds +
293 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
299 if (xp->lft.soft_add_expires_seconds) {
300 long tmo = xp->lft.soft_add_expires_seconds +
301 xp->curlft.add_time - now;
304 tmo = XFRM_KM_TIMEOUT;
309 if (xp->lft.soft_use_expires_seconds) {
310 long tmo = xp->lft.soft_use_expires_seconds +
311 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
314 tmo = XFRM_KM_TIMEOUT;
321 km_policy_expired(xp, dir, 0, 0);
322 if (next != LONG_MAX &&
323 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
327 read_unlock(&xp->lock);
332 read_unlock(&xp->lock);
333 if (!xfrm_policy_delete(xp, dir))
334 km_policy_expired(xp, dir, 1, 0);
339 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
343 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
345 struct xfrm_policy *policy;
347 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
350 INIT_HLIST_NODE(&policy->bydst);
351 INIT_HLIST_NODE(&policy->byidx);
352 rwlock_init(&policy->lock);
353 atomic_set(&policy->refcnt, 1);
354 init_timer(&policy->timer);
355 policy->timer.data = (unsigned long)policy;
356 policy->timer.function = xfrm_policy_timer;
360 EXPORT_SYMBOL(xfrm_policy_alloc);
362 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
364 void __xfrm_policy_destroy(struct xfrm_policy *policy)
366 BUG_ON(!policy->dead);
368 BUG_ON(policy->bundles);
370 if (del_timer(&policy->timer))
373 security_xfrm_policy_free(policy);
376 EXPORT_SYMBOL(__xfrm_policy_destroy);
378 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
380 struct dst_entry *dst;
382 while ((dst = policy->bundles) != NULL) {
383 policy->bundles = dst->next;
387 if (del_timer(&policy->timer))
388 atomic_dec(&policy->refcnt);
390 if (atomic_read(&policy->refcnt) > 1)
393 xfrm_pol_put(policy);
396 static void xfrm_policy_gc_task(struct work_struct *work)
398 struct xfrm_policy *policy;
399 struct hlist_node *entry, *tmp;
400 struct hlist_head gc_list;
402 spin_lock_bh(&xfrm_policy_gc_lock);
403 gc_list.first = xfrm_policy_gc_list.first;
404 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
405 spin_unlock_bh(&xfrm_policy_gc_lock);
407 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
408 xfrm_policy_gc_kill(policy);
411 /* Rule must be locked. Release descentant resources, announce
412 * entry dead. The rule must be unlinked from lists to the moment.
415 static void xfrm_policy_kill(struct xfrm_policy *policy)
419 write_lock_bh(&policy->lock);
422 write_unlock_bh(&policy->lock);
424 if (unlikely(dead)) {
429 spin_lock(&xfrm_policy_gc_lock);
430 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
431 spin_unlock(&xfrm_policy_gc_lock);
433 schedule_work(&xfrm_policy_gc_work);
436 struct xfrm_policy_hash {
437 struct hlist_head *table;
441 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
442 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
443 static struct hlist_head *xfrm_policy_byidx __read_mostly;
444 static unsigned int xfrm_idx_hmask __read_mostly;
445 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
447 static inline unsigned int idx_hash(u32 index)
449 return __idx_hash(index, xfrm_idx_hmask);
452 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
454 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
455 unsigned int hash = __sel_hash(sel, family, hmask);
457 return (hash == hmask + 1 ?
458 &xfrm_policy_inexact[dir] :
459 xfrm_policy_bydst[dir].table + hash);
462 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
464 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
465 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
467 return xfrm_policy_bydst[dir].table + hash;
470 static void xfrm_dst_hash_transfer(struct hlist_head *list,
471 struct hlist_head *ndsttable,
472 unsigned int nhashmask)
474 struct hlist_node *entry, *tmp;
475 struct xfrm_policy *pol;
477 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
480 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
481 pol->family, nhashmask);
482 hlist_add_head(&pol->bydst, ndsttable+h);
486 static void xfrm_idx_hash_transfer(struct hlist_head *list,
487 struct hlist_head *nidxtable,
488 unsigned int nhashmask)
490 struct hlist_node *entry, *tmp;
491 struct xfrm_policy *pol;
493 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
496 h = __idx_hash(pol->index, nhashmask);
497 hlist_add_head(&pol->byidx, nidxtable+h);
501 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
503 return ((old_hmask + 1) << 1) - 1;
506 static void xfrm_bydst_resize(int dir)
508 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
509 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
510 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
511 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
512 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
518 write_lock_bh(&xfrm_policy_lock);
520 for (i = hmask; i >= 0; i--)
521 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
523 xfrm_policy_bydst[dir].table = ndst;
524 xfrm_policy_bydst[dir].hmask = nhashmask;
526 write_unlock_bh(&xfrm_policy_lock);
528 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
531 static void xfrm_byidx_resize(int total)
533 unsigned int hmask = xfrm_idx_hmask;
534 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
535 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
536 struct hlist_head *oidx = xfrm_policy_byidx;
537 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
543 write_lock_bh(&xfrm_policy_lock);
545 for (i = hmask; i >= 0; i--)
546 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
548 xfrm_policy_byidx = nidx;
549 xfrm_idx_hmask = nhashmask;
551 write_unlock_bh(&xfrm_policy_lock);
553 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
556 static inline int xfrm_bydst_should_resize(int dir, int *total)
558 unsigned int cnt = xfrm_policy_count[dir];
559 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
564 if ((hmask + 1) < xfrm_policy_hashmax &&
571 static inline int xfrm_byidx_should_resize(int total)
573 unsigned int hmask = xfrm_idx_hmask;
575 if ((hmask + 1) < xfrm_policy_hashmax &&
582 static DEFINE_MUTEX(hash_resize_mutex);
584 static void xfrm_hash_resize(struct work_struct *__unused)
588 mutex_lock(&hash_resize_mutex);
591 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
592 if (xfrm_bydst_should_resize(dir, &total))
593 xfrm_bydst_resize(dir);
595 if (xfrm_byidx_should_resize(total))
596 xfrm_byidx_resize(total);
598 mutex_unlock(&hash_resize_mutex);
601 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
603 /* Generate new index... KAME seems to generate them ordered by cost
604 * of an absolute inpredictability of ordering of rules. This will not pass. */
605 static u32 xfrm_gen_index(u8 type, int dir)
607 static u32 idx_generator;
610 struct hlist_node *entry;
611 struct hlist_head *list;
612 struct xfrm_policy *p;
616 idx = (idx_generator | dir);
620 list = xfrm_policy_byidx + idx_hash(idx);
622 hlist_for_each_entry(p, entry, list, byidx) {
623 if (p->index == idx) {
633 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
635 u32 *p1 = (u32 *) s1;
636 u32 *p2 = (u32 *) s2;
637 int len = sizeof(struct xfrm_selector) / sizeof(u32);
640 for (i = 0; i < len; i++) {
648 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
650 struct xfrm_policy *pol;
651 struct xfrm_policy *delpol;
652 struct hlist_head *chain;
653 struct hlist_node *entry, *newpos;
654 struct dst_entry *gc_list;
656 write_lock_bh(&xfrm_policy_lock);
657 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
660 hlist_for_each_entry(pol, entry, chain, bydst) {
661 if (pol->type == policy->type &&
662 !selector_cmp(&pol->selector, &policy->selector) &&
663 xfrm_sec_ctx_match(pol->security, policy->security) &&
666 write_unlock_bh(&xfrm_policy_lock);
670 if (policy->priority > pol->priority)
672 } else if (policy->priority >= pol->priority) {
673 newpos = &pol->bydst;
680 hlist_add_after(newpos, &policy->bydst);
682 hlist_add_head(&policy->bydst, chain);
683 xfrm_pol_hold(policy);
684 xfrm_policy_count[dir]++;
685 atomic_inc(&flow_cache_genid);
687 hlist_del(&delpol->bydst);
688 hlist_del(&delpol->byidx);
689 xfrm_policy_count[dir]--;
691 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
692 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
693 policy->curlft.add_time = (unsigned long)xtime.tv_sec;
694 policy->curlft.use_time = 0;
695 if (!mod_timer(&policy->timer, jiffies + HZ))
696 xfrm_pol_hold(policy);
697 write_unlock_bh(&xfrm_policy_lock);
700 xfrm_policy_kill(delpol);
701 else if (xfrm_bydst_should_resize(dir, NULL))
702 schedule_work(&xfrm_hash_work);
704 read_lock_bh(&xfrm_policy_lock);
706 entry = &policy->bydst;
707 hlist_for_each_entry_continue(policy, entry, bydst) {
708 struct dst_entry *dst;
710 write_lock(&policy->lock);
711 dst = policy->bundles;
713 struct dst_entry *tail = dst;
716 tail->next = gc_list;
719 policy->bundles = NULL;
721 write_unlock(&policy->lock);
723 read_unlock_bh(&xfrm_policy_lock);
726 struct dst_entry *dst = gc_list;
734 EXPORT_SYMBOL(xfrm_policy_insert);
736 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
737 struct xfrm_selector *sel,
738 struct xfrm_sec_ctx *ctx, int delete,
741 struct xfrm_policy *pol, *ret;
742 struct hlist_head *chain;
743 struct hlist_node *entry;
746 write_lock_bh(&xfrm_policy_lock);
747 chain = policy_hash_bysel(sel, sel->family, dir);
749 hlist_for_each_entry(pol, entry, chain, bydst) {
750 if (pol->type == type &&
751 !selector_cmp(sel, &pol->selector) &&
752 xfrm_sec_ctx_match(ctx, pol->security)) {
755 *err = security_xfrm_policy_delete(pol);
757 write_unlock_bh(&xfrm_policy_lock);
760 hlist_del(&pol->bydst);
761 hlist_del(&pol->byidx);
762 xfrm_policy_count[dir]--;
768 write_unlock_bh(&xfrm_policy_lock);
771 atomic_inc(&flow_cache_genid);
772 xfrm_policy_kill(ret);
776 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
778 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
781 struct xfrm_policy *pol, *ret;
782 struct hlist_head *chain;
783 struct hlist_node *entry;
786 write_lock_bh(&xfrm_policy_lock);
787 chain = xfrm_policy_byidx + idx_hash(id);
789 hlist_for_each_entry(pol, entry, chain, byidx) {
790 if (pol->type == type && pol->index == id) {
793 *err = security_xfrm_policy_delete(pol);
795 write_unlock_bh(&xfrm_policy_lock);
798 hlist_del(&pol->bydst);
799 hlist_del(&pol->byidx);
800 xfrm_policy_count[dir]--;
806 write_unlock_bh(&xfrm_policy_lock);
809 atomic_inc(&flow_cache_genid);
810 xfrm_policy_kill(ret);
814 EXPORT_SYMBOL(xfrm_policy_byid);
816 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
820 write_lock_bh(&xfrm_policy_lock);
821 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
822 struct xfrm_policy *pol;
823 struct hlist_node *entry;
828 hlist_for_each_entry(pol, entry,
829 &xfrm_policy_inexact[dir], bydst) {
830 if (pol->type != type)
832 hlist_del(&pol->bydst);
833 hlist_del(&pol->byidx);
834 write_unlock_bh(&xfrm_policy_lock);
836 xfrm_audit_log(audit_info->loginuid, audit_info->secid,
837 AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL);
839 xfrm_policy_kill(pol);
842 write_lock_bh(&xfrm_policy_lock);
846 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
848 hlist_for_each_entry(pol, entry,
849 xfrm_policy_bydst[dir].table + i,
851 if (pol->type != type)
853 hlist_del(&pol->bydst);
854 hlist_del(&pol->byidx);
855 write_unlock_bh(&xfrm_policy_lock);
857 xfrm_audit_log(audit_info->loginuid,
859 AUDIT_MAC_IPSEC_DELSPD, 1,
862 xfrm_policy_kill(pol);
865 write_lock_bh(&xfrm_policy_lock);
870 xfrm_policy_count[dir] -= killed;
872 atomic_inc(&flow_cache_genid);
873 write_unlock_bh(&xfrm_policy_lock);
875 EXPORT_SYMBOL(xfrm_policy_flush);
877 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
880 struct xfrm_policy *pol, *last = NULL;
881 struct hlist_node *entry;
882 int dir, last_dir = 0, count, error;
884 read_lock_bh(&xfrm_policy_lock);
887 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
888 struct hlist_head *table = xfrm_policy_bydst[dir].table;
891 hlist_for_each_entry(pol, entry,
892 &xfrm_policy_inexact[dir], bydst) {
893 if (pol->type != type)
896 error = func(last, last_dir % XFRM_POLICY_MAX,
905 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
906 hlist_for_each_entry(pol, entry, table + i, bydst) {
907 if (pol->type != type)
910 error = func(last, last_dir % XFRM_POLICY_MAX,
925 error = func(last, last_dir % XFRM_POLICY_MAX, 0, data);
927 read_unlock_bh(&xfrm_policy_lock);
930 EXPORT_SYMBOL(xfrm_policy_walk);
933 * Find policy to apply to this flow.
935 * Returns 0 if policy found, else an -errno.
937 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
938 u8 type, u16 family, int dir)
940 struct xfrm_selector *sel = &pol->selector;
941 int match, ret = -ESRCH;
943 if (pol->family != family ||
947 match = xfrm_selector_match(sel, fl, family);
949 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
954 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
958 struct xfrm_policy *pol, *ret;
959 xfrm_address_t *daddr, *saddr;
960 struct hlist_node *entry;
961 struct hlist_head *chain;
964 daddr = xfrm_flowi_daddr(fl, family);
965 saddr = xfrm_flowi_saddr(fl, family);
966 if (unlikely(!daddr || !saddr))
969 read_lock_bh(&xfrm_policy_lock);
970 chain = policy_hash_direct(daddr, saddr, family, dir);
972 hlist_for_each_entry(pol, entry, chain, bydst) {
973 err = xfrm_policy_match(pol, fl, type, family, dir);
983 priority = ret->priority;
987 chain = &xfrm_policy_inexact[dir];
988 hlist_for_each_entry(pol, entry, chain, bydst) {
989 err = xfrm_policy_match(pol, fl, type, family, dir);
997 } else if (pol->priority < priority) {
1005 read_unlock_bh(&xfrm_policy_lock);
1010 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
1011 void **objp, atomic_t **obj_refp)
1013 struct xfrm_policy *pol;
1016 #ifdef CONFIG_XFRM_SUB_POLICY
1017 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
1025 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1030 #ifdef CONFIG_XFRM_SUB_POLICY
1033 if ((*objp = (void *) pol) != NULL)
1034 *obj_refp = &pol->refcnt;
1038 static inline int policy_to_flow_dir(int dir)
1040 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1041 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1042 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1046 case XFRM_POLICY_IN:
1048 case XFRM_POLICY_OUT:
1049 return FLOW_DIR_OUT;
1050 case XFRM_POLICY_FWD:
1051 return FLOW_DIR_FWD;
1055 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1057 struct xfrm_policy *pol;
1059 read_lock_bh(&xfrm_policy_lock);
1060 if ((pol = sk->sk_policy[dir]) != NULL) {
1061 int match = xfrm_selector_match(&pol->selector, fl,
1066 err = security_xfrm_policy_lookup(pol, fl->secid,
1067 policy_to_flow_dir(dir));
1070 else if (err == -ESRCH)
1077 read_unlock_bh(&xfrm_policy_lock);
1081 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1083 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1086 hlist_add_head(&pol->bydst, chain);
1087 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1088 xfrm_policy_count[dir]++;
1091 if (xfrm_bydst_should_resize(dir, NULL))
1092 schedule_work(&xfrm_hash_work);
1095 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1098 if (hlist_unhashed(&pol->bydst))
1101 hlist_del(&pol->bydst);
1102 hlist_del(&pol->byidx);
1103 xfrm_policy_count[dir]--;
1108 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1110 write_lock_bh(&xfrm_policy_lock);
1111 pol = __xfrm_policy_unlink(pol, dir);
1112 write_unlock_bh(&xfrm_policy_lock);
1114 if (dir < XFRM_POLICY_MAX)
1115 atomic_inc(&flow_cache_genid);
1116 xfrm_policy_kill(pol);
1121 EXPORT_SYMBOL(xfrm_policy_delete);
1123 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1125 struct xfrm_policy *old_pol;
1127 #ifdef CONFIG_XFRM_SUB_POLICY
1128 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1132 write_lock_bh(&xfrm_policy_lock);
1133 old_pol = sk->sk_policy[dir];
1134 sk->sk_policy[dir] = pol;
1136 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
1137 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1138 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1141 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1142 write_unlock_bh(&xfrm_policy_lock);
1145 xfrm_policy_kill(old_pol);
1150 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1152 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1155 newp->selector = old->selector;
1156 if (security_xfrm_policy_clone(old, newp)) {
1158 return NULL; /* ENOMEM */
1160 newp->lft = old->lft;
1161 newp->curlft = old->curlft;
1162 newp->action = old->action;
1163 newp->flags = old->flags;
1164 newp->xfrm_nr = old->xfrm_nr;
1165 newp->index = old->index;
1166 newp->type = old->type;
1167 memcpy(newp->xfrm_vec, old->xfrm_vec,
1168 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1169 write_lock_bh(&xfrm_policy_lock);
1170 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1171 write_unlock_bh(&xfrm_policy_lock);
1177 int __xfrm_sk_clone_policy(struct sock *sk)
1179 struct xfrm_policy *p0 = sk->sk_policy[0],
1180 *p1 = sk->sk_policy[1];
1182 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1183 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1185 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1191 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1192 unsigned short family)
1195 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1197 if (unlikely(afinfo == NULL))
1199 err = afinfo->get_saddr(local, remote);
1200 xfrm_policy_put_afinfo(afinfo);
1204 /* Resolve list of templates for the flow, given policy. */
1207 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1208 struct xfrm_state **xfrm,
1209 unsigned short family)
1213 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1214 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1217 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1218 struct xfrm_state *x;
1219 xfrm_address_t *remote = daddr;
1220 xfrm_address_t *local = saddr;
1221 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1223 if (tmpl->mode == XFRM_MODE_TUNNEL) {
1224 remote = &tmpl->id.daddr;
1225 local = &tmpl->saddr;
1226 family = tmpl->encap_family;
1227 if (xfrm_addr_any(local, family)) {
1228 error = xfrm_get_saddr(&tmp, remote, family);
1235 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1237 if (x && x->km.state == XFRM_STATE_VALID) {
1244 error = (x->km.state == XFRM_STATE_ERROR ?
1249 if (!tmpl->optional)
1255 for (nx--; nx>=0; nx--)
1256 xfrm_state_put(xfrm[nx]);
1261 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1262 struct xfrm_state **xfrm,
1263 unsigned short family)
1265 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1266 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1272 for (i = 0; i < npols; i++) {
1273 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1278 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1286 /* found states are sorted for outbound processing */
1288 xfrm_state_sort(xfrm, tpp, cnx, family);
1293 for (cnx--; cnx>=0; cnx--)
1294 xfrm_state_put(tpp[cnx]);
1299 /* Check that the bundle accepts the flow and its components are
1303 static struct dst_entry *
1304 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1306 struct dst_entry *x;
1307 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1308 if (unlikely(afinfo == NULL))
1309 return ERR_PTR(-EINVAL);
1310 x = afinfo->find_bundle(fl, policy);
1311 xfrm_policy_put_afinfo(afinfo);
1315 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1316 * all the metrics... Shortly, bundle a bundle.
1320 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1321 struct flowi *fl, struct dst_entry **dst_p,
1322 unsigned short family)
1325 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1326 if (unlikely(afinfo == NULL))
1328 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1329 xfrm_policy_put_afinfo(afinfo);
1334 static int stale_bundle(struct dst_entry *dst);
1336 /* Main function: finds/creates a bundle for given flow.
1338 * At the moment we eat a raw IP route. Mostly to speed up lookups
1339 * on interfaces with disabled IPsec.
1341 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1342 struct sock *sk, int flags)
1344 struct xfrm_policy *policy;
1345 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1350 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1351 struct dst_entry *dst, *dst_orig = *dst_p;
1356 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1359 genid = atomic_read(&flow_cache_genid);
1361 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1367 if (sk && sk->sk_policy[1]) {
1368 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1370 return PTR_ERR(policy);
1374 /* To accelerate a bit... */
1375 if ((dst_orig->flags & DST_NOXFRM) ||
1376 !xfrm_policy_count[XFRM_POLICY_OUT])
1379 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1380 dir, xfrm_policy_lookup);
1382 return PTR_ERR(policy);
1388 family = dst_orig->ops->family;
1389 policy->curlft.use_time = (unsigned long)xtime.tv_sec;
1392 xfrm_nr += pols[0]->xfrm_nr;
1394 switch (policy->action) {
1395 case XFRM_POLICY_BLOCK:
1396 /* Prohibit the flow */
1400 case XFRM_POLICY_ALLOW:
1401 #ifndef CONFIG_XFRM_SUB_POLICY
1402 if (policy->xfrm_nr == 0) {
1403 /* Flow passes not transformed. */
1404 xfrm_pol_put(policy);
1409 /* Try to find matching bundle.
1411 * LATER: help from flow cache. It is optional, this
1412 * is required only for output policy.
1414 dst = xfrm_find_bundle(fl, policy, family);
1423 #ifdef CONFIG_XFRM_SUB_POLICY
1424 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1425 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1429 if (IS_ERR(pols[1])) {
1430 err = PTR_ERR(pols[1]);
1433 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1438 xfrm_nr += pols[1]->xfrm_nr;
1443 * Because neither flowi nor bundle information knows about
1444 * transformation template size. On more than one policy usage
1445 * we can realize whether all of them is bypass or not after
1446 * they are searched. See above not-transformed bypass
1447 * is surrounded by non-sub policy configuration, too.
1450 /* Flow passes not transformed. */
1451 xfrm_pols_put(pols, npols);
1456 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1458 if (unlikely(nx<0)) {
1460 if (err == -EAGAIN && flags) {
1461 DECLARE_WAITQUEUE(wait, current);
1463 add_wait_queue(&km_waitq, &wait);
1464 set_current_state(TASK_INTERRUPTIBLE);
1466 set_current_state(TASK_RUNNING);
1467 remove_wait_queue(&km_waitq, &wait);
1469 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1471 if (nx == -EAGAIN && signal_pending(current)) {
1475 if (nx == -EAGAIN ||
1476 genid != atomic_read(&flow_cache_genid)) {
1477 xfrm_pols_put(pols, npols);
1486 /* Flow passes not transformed. */
1487 xfrm_pols_put(pols, npols);
1492 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1494 if (unlikely(err)) {
1496 for (i=0; i<nx; i++)
1497 xfrm_state_put(xfrm[i]);
1501 for (pi = 0; pi < npols; pi++) {
1502 read_lock_bh(&pols[pi]->lock);
1503 pol_dead |= pols[pi]->dead;
1504 read_unlock_bh(&pols[pi]->lock);
1507 write_lock_bh(&policy->lock);
1508 if (unlikely(pol_dead || stale_bundle(dst))) {
1509 /* Wow! While we worked on resolving, this
1510 * policy has gone. Retry. It is not paranoia,
1511 * we just cannot enlist new bundle to dead object.
1512 * We can't enlist stable bundles either.
1514 write_unlock_bh(&policy->lock);
1518 err = -EHOSTUNREACH;
1521 dst->next = policy->bundles;
1522 policy->bundles = dst;
1524 write_unlock_bh(&policy->lock);
1527 dst_release(dst_orig);
1528 xfrm_pols_put(pols, npols);
1532 dst_release(dst_orig);
1533 xfrm_pols_put(pols, npols);
1537 EXPORT_SYMBOL(xfrm_lookup);
1540 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1542 struct xfrm_state *x;
1545 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1547 x = skb->sp->xvec[idx];
1548 if (!x->type->reject)
1551 err = x->type->reject(x, skb, fl);
1556 /* When skb is transformed back to its "native" form, we have to
1557 * check policy restrictions. At the moment we make this in maximally
1558 * stupid way. Shame on me. :-) Of course, connected sockets must
1559 * have policy cached at them.
1563 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1564 unsigned short family)
1566 if (xfrm_state_kern(x))
1567 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1568 return x->id.proto == tmpl->id.proto &&
1569 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1570 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1571 x->props.mode == tmpl->mode &&
1572 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1573 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1574 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1575 xfrm_state_addr_cmp(tmpl, x, family));
1579 * 0 or more than 0 is returned when validation is succeeded (either bypass
1580 * because of optional transport mode, or next index of the mathced secpath
1581 * state with the template.
1582 * -1 is returned when no matching template is found.
1583 * Otherwise "-2 - errored_index" is returned.
1586 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1587 unsigned short family)
1591 if (tmpl->optional) {
1592 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1596 for (; idx < sp->len; idx++) {
1597 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1599 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1609 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1611 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1614 if (unlikely(afinfo == NULL))
1615 return -EAFNOSUPPORT;
1617 afinfo->decode_session(skb, fl);
1618 err = security_xfrm_decode_session(skb, &fl->secid);
1619 xfrm_policy_put_afinfo(afinfo);
1622 EXPORT_SYMBOL(xfrm_decode_session);
1624 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1626 for (; k < sp->len; k++) {
1627 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1636 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1637 unsigned short family)
1639 struct xfrm_policy *pol;
1640 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1645 u8 fl_dir = policy_to_flow_dir(dir);
1648 if (xfrm_decode_session(skb, &fl, family) < 0)
1650 nf_nat_decode_session(skb, &fl, family);
1652 /* First, check used SA against their selectors. */
1656 for (i=skb->sp->len-1; i>=0; i--) {
1657 struct xfrm_state *x = skb->sp->xvec[i];
1658 if (!xfrm_selector_match(&x->sel, &fl, family))
1664 if (sk && sk->sk_policy[dir]) {
1665 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1671 pol = flow_cache_lookup(&fl, family, fl_dir,
1672 xfrm_policy_lookup);
1678 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1679 xfrm_secpath_reject(xerr_idx, skb, &fl);
1685 pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1689 #ifdef CONFIG_XFRM_SUB_POLICY
1690 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1691 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1695 if (IS_ERR(pols[1]))
1697 pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
1703 if (pol->action == XFRM_POLICY_ALLOW) {
1704 struct sec_path *sp;
1705 static struct sec_path dummy;
1706 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1707 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1708 struct xfrm_tmpl **tpp = tp;
1712 if ((sp = skb->sp) == NULL)
1715 for (pi = 0; pi < npols; pi++) {
1716 if (pols[pi] != pol &&
1717 pols[pi]->action != XFRM_POLICY_ALLOW)
1719 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1721 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1722 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1726 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1730 /* For each tunnel xfrm, find the first matching tmpl.
1731 * For each tmpl before that, find corresponding xfrm.
1732 * Order is _important_. Later we will implement
1733 * some barriers, but at the moment barriers
1734 * are implied between each two transformations.
1736 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1737 k = xfrm_policy_ok(tpp[i], sp, k, family);
1740 /* "-2 - errored_index" returned */
1746 if (secpath_has_nontransport(sp, k, &xerr_idx))
1749 xfrm_pols_put(pols, npols);
1754 xfrm_secpath_reject(xerr_idx, skb, &fl);
1756 xfrm_pols_put(pols, npols);
1759 EXPORT_SYMBOL(__xfrm_policy_check);
1761 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1765 if (xfrm_decode_session(skb, &fl, family) < 0)
1768 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1770 EXPORT_SYMBOL(__xfrm_route_forward);
1772 /* Optimize later using cookies and generation ids. */
1774 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1776 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1777 * to "-1" to force all XFRM destinations to get validated by
1778 * dst_ops->check on every use. We do this because when a
1779 * normal route referenced by an XFRM dst is obsoleted we do
1780 * not go looking around for all parent referencing XFRM dsts
1781 * so that we can invalidate them. It is just too much work.
1782 * Instead we make the checks here on every use. For example:
1784 * XFRM dst A --> IPv4 dst X
1786 * X is the "xdst->route" of A (X is also the "dst->path" of A
1787 * in this example). If X is marked obsolete, "A" will not
1788 * notice. That's what we are validating here via the
1789 * stale_bundle() check.
1791 * When a policy's bundle is pruned, we dst_free() the XFRM
1792 * dst which causes it's ->obsolete field to be set to a
1793 * positive non-zero integer. If an XFRM dst has been pruned
1794 * like this, we want to force a new route lookup.
1796 if (dst->obsolete < 0 && !stale_bundle(dst))
1802 static int stale_bundle(struct dst_entry *dst)
1804 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1807 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1809 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1810 dst->dev = &loopback_dev;
1811 dev_hold(&loopback_dev);
1815 EXPORT_SYMBOL(xfrm_dst_ifdown);
1817 static void xfrm_link_failure(struct sk_buff *skb)
1819 /* Impossible. Such dst must be popped before reaches point of failure. */
1823 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1826 if (dst->obsolete) {
1834 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1836 struct dst_entry *dst, **dstp;
1838 write_lock(&pol->lock);
1839 dstp = &pol->bundles;
1840 while ((dst=*dstp) != NULL) {
1843 dst->next = *gc_list_p;
1849 write_unlock(&pol->lock);
1852 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1854 struct dst_entry *gc_list = NULL;
1857 read_lock_bh(&xfrm_policy_lock);
1858 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1859 struct xfrm_policy *pol;
1860 struct hlist_node *entry;
1861 struct hlist_head *table;
1864 hlist_for_each_entry(pol, entry,
1865 &xfrm_policy_inexact[dir], bydst)
1866 prune_one_bundle(pol, func, &gc_list);
1868 table = xfrm_policy_bydst[dir].table;
1869 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1870 hlist_for_each_entry(pol, entry, table + i, bydst)
1871 prune_one_bundle(pol, func, &gc_list);
1874 read_unlock_bh(&xfrm_policy_lock);
1877 struct dst_entry *dst = gc_list;
1878 gc_list = dst->next;
1883 static int unused_bundle(struct dst_entry *dst)
1885 return !atomic_read(&dst->__refcnt);
1888 static void __xfrm_garbage_collect(void)
1890 xfrm_prune_bundles(unused_bundle);
1893 static int xfrm_flush_bundles(void)
1895 xfrm_prune_bundles(stale_bundle);
1899 void xfrm_init_pmtu(struct dst_entry *dst)
1902 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1903 u32 pmtu, route_mtu_cached;
1905 pmtu = dst_mtu(dst->child);
1906 xdst->child_mtu_cached = pmtu;
1908 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1910 route_mtu_cached = dst_mtu(xdst->route);
1911 xdst->route_mtu_cached = route_mtu_cached;
1913 if (pmtu > route_mtu_cached)
1914 pmtu = route_mtu_cached;
1916 dst->metrics[RTAX_MTU-1] = pmtu;
1917 } while ((dst = dst->next));
1920 EXPORT_SYMBOL(xfrm_init_pmtu);
1922 /* Check that the bundle accepts the flow and its components are
1926 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
1927 struct flowi *fl, int family, int strict)
1929 struct dst_entry *dst = &first->u.dst;
1930 struct xfrm_dst *last;
1933 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1934 (dst->dev && !netif_running(dst->dev)))
1940 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1942 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1945 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
1947 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1949 if (xdst->genid != dst->xfrm->genid)
1952 if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
1953 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
1956 mtu = dst_mtu(dst->child);
1957 if (xdst->child_mtu_cached != mtu) {
1959 xdst->child_mtu_cached = mtu;
1962 if (!dst_check(xdst->route, xdst->route_cookie))
1964 mtu = dst_mtu(xdst->route);
1965 if (xdst->route_mtu_cached != mtu) {
1967 xdst->route_mtu_cached = mtu;
1971 } while (dst->xfrm);
1976 mtu = last->child_mtu_cached;
1980 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1981 if (mtu > last->route_mtu_cached)
1982 mtu = last->route_mtu_cached;
1983 dst->metrics[RTAX_MTU-1] = mtu;
1988 last = last->u.next;
1989 last->child_mtu_cached = mtu;
1995 EXPORT_SYMBOL(xfrm_bundle_ok);
1997 #ifdef CONFIG_AUDITSYSCALL
1998 /* Audit addition and deletion of SAs and ipsec policy */
2000 void xfrm_audit_log(uid_t auid, u32 sid, int type, int result,
2001 struct xfrm_policy *xp, struct xfrm_state *x)
2006 struct xfrm_sec_ctx *sctx = NULL;
2007 struct audit_buffer *audit_buf;
2009 extern int audit_enabled;
2011 if (audit_enabled == 0)
2014 BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA ||
2015 type == AUDIT_MAC_IPSEC_DELSA) && !x);
2016 BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD ||
2017 type == AUDIT_MAC_IPSEC_DELSPD) && !xp);
2019 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
2020 if (audit_buf == NULL)
2024 case AUDIT_MAC_IPSEC_ADDSA:
2025 audit_log_format(audit_buf, "SAD add: auid=%u", auid);
2027 case AUDIT_MAC_IPSEC_DELSA:
2028 audit_log_format(audit_buf, "SAD delete: auid=%u", auid);
2030 case AUDIT_MAC_IPSEC_ADDSPD:
2031 audit_log_format(audit_buf, "SPD add: auid=%u", auid);
2033 case AUDIT_MAC_IPSEC_DELSPD:
2034 audit_log_format(audit_buf, "SPD delete: auid=%u", auid);
2041 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0)
2042 audit_log_format(audit_buf, " subj=%s", secctx);
2044 audit_log_task_context(audit_buf);
2047 family = xp->selector.family;
2049 sctx = xp->security;
2051 family = x->props.family;
2057 audit_log_format(audit_buf,
2058 " sec_alg=%u sec_doi=%u sec_obj=%s",
2059 sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str);
2064 struct in_addr saddr, daddr;
2066 saddr.s_addr = xp->selector.saddr.a4;
2067 daddr.s_addr = xp->selector.daddr.a4;
2069 saddr.s_addr = x->props.saddr.a4;
2070 daddr.s_addr = x->id.daddr.a4;
2072 audit_log_format(audit_buf,
2073 " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
2074 NIPQUAD(saddr), NIPQUAD(daddr));
2079 struct in6_addr saddr6, daddr6;
2081 memcpy(&saddr6, xp->selector.saddr.a6,
2082 sizeof(struct in6_addr));
2083 memcpy(&daddr6, xp->selector.daddr.a6,
2084 sizeof(struct in6_addr));
2086 memcpy(&saddr6, x->props.saddr.a6,
2087 sizeof(struct in6_addr));
2088 memcpy(&daddr6, x->id.daddr.a6,
2089 sizeof(struct in6_addr));
2091 audit_log_format(audit_buf,
2092 " src=" NIP6_FMT "dst=" NIP6_FMT,
2093 NIP6(saddr6), NIP6(daddr6));
2099 audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s",
2100 (unsigned long)ntohl(x->id.spi),
2101 (unsigned long)ntohl(x->id.spi),
2102 x->id.proto == IPPROTO_AH ? "AH" :
2103 (x->id.proto == IPPROTO_ESP ?
2106 audit_log_format(audit_buf, " res=%u", result);
2107 audit_log_end(audit_buf);
2110 EXPORT_SYMBOL(xfrm_audit_log);
2111 #endif /* CONFIG_AUDITSYSCALL */
2113 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2116 if (unlikely(afinfo == NULL))
2118 if (unlikely(afinfo->family >= NPROTO))
2119 return -EAFNOSUPPORT;
2120 write_lock_bh(&xfrm_policy_afinfo_lock);
2121 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2124 struct dst_ops *dst_ops = afinfo->dst_ops;
2125 if (likely(dst_ops->kmem_cachep == NULL))
2126 dst_ops->kmem_cachep = xfrm_dst_cache;
2127 if (likely(dst_ops->check == NULL))
2128 dst_ops->check = xfrm_dst_check;
2129 if (likely(dst_ops->negative_advice == NULL))
2130 dst_ops->negative_advice = xfrm_negative_advice;
2131 if (likely(dst_ops->link_failure == NULL))
2132 dst_ops->link_failure = xfrm_link_failure;
2133 if (likely(afinfo->garbage_collect == NULL))
2134 afinfo->garbage_collect = __xfrm_garbage_collect;
2135 xfrm_policy_afinfo[afinfo->family] = afinfo;
2137 write_unlock_bh(&xfrm_policy_afinfo_lock);
2140 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2142 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2145 if (unlikely(afinfo == NULL))
2147 if (unlikely(afinfo->family >= NPROTO))
2148 return -EAFNOSUPPORT;
2149 write_lock_bh(&xfrm_policy_afinfo_lock);
2150 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2151 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2154 struct dst_ops *dst_ops = afinfo->dst_ops;
2155 xfrm_policy_afinfo[afinfo->family] = NULL;
2156 dst_ops->kmem_cachep = NULL;
2157 dst_ops->check = NULL;
2158 dst_ops->negative_advice = NULL;
2159 dst_ops->link_failure = NULL;
2160 afinfo->garbage_collect = NULL;
2163 write_unlock_bh(&xfrm_policy_afinfo_lock);
2166 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2168 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2170 struct xfrm_policy_afinfo *afinfo;
2171 if (unlikely(family >= NPROTO))
2173 read_lock(&xfrm_policy_afinfo_lock);
2174 afinfo = xfrm_policy_afinfo[family];
2175 if (unlikely(!afinfo))
2176 read_unlock(&xfrm_policy_afinfo_lock);
2180 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2182 read_unlock(&xfrm_policy_afinfo_lock);
2185 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
2187 struct xfrm_policy_afinfo *afinfo;
2188 if (unlikely(family >= NPROTO))
2190 write_lock_bh(&xfrm_policy_afinfo_lock);
2191 afinfo = xfrm_policy_afinfo[family];
2192 if (unlikely(!afinfo))
2193 write_unlock_bh(&xfrm_policy_afinfo_lock);
2197 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
2199 write_unlock_bh(&xfrm_policy_afinfo_lock);
2202 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2206 xfrm_flush_bundles();
2211 static struct notifier_block xfrm_dev_notifier = {
2217 static void __init xfrm_policy_init(void)
2219 unsigned int hmask, sz;
2222 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2223 sizeof(struct xfrm_dst),
2224 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2228 sz = (hmask+1) * sizeof(struct hlist_head);
2230 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2231 xfrm_idx_hmask = hmask;
2232 if (!xfrm_policy_byidx)
2233 panic("XFRM: failed to allocate byidx hash\n");
2235 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2236 struct xfrm_policy_hash *htab;
2238 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2240 htab = &xfrm_policy_bydst[dir];
2241 htab->table = xfrm_hash_alloc(sz);
2242 htab->hmask = hmask;
2244 panic("XFRM: failed to allocate bydst hash\n");
2247 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2248 register_netdevice_notifier(&xfrm_dev_notifier);
2251 void __init xfrm_init(void)
2258 #ifdef CONFIG_XFRM_MIGRATE
2259 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2260 struct xfrm_selector *sel_tgt)
2262 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2263 if (sel_tgt->family == sel_cmp->family &&
2264 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2265 sel_cmp->family) == 0 &&
2266 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2267 sel_cmp->family) == 0 &&
2268 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2269 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2273 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2280 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2283 struct xfrm_policy *pol, *ret = NULL;
2284 struct hlist_node *entry;
2285 struct hlist_head *chain;
2288 read_lock_bh(&xfrm_policy_lock);
2289 chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
2290 hlist_for_each_entry(pol, entry, chain, bydst) {
2291 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2292 pol->type == type) {
2294 priority = ret->priority;
2298 chain = &xfrm_policy_inexact[dir];
2299 hlist_for_each_entry(pol, entry, chain, bydst) {
2300 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2301 pol->type == type &&
2302 pol->priority < priority) {
2311 read_unlock_bh(&xfrm_policy_lock);
2316 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2320 if (t->mode == m->mode && t->id.proto == m->proto &&
2321 (m->reqid == 0 || t->reqid == m->reqid)) {
2323 case XFRM_MODE_TUNNEL:
2324 case XFRM_MODE_BEET:
2325 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2326 m->old_family) == 0 &&
2327 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2328 m->old_family) == 0) {
2332 case XFRM_MODE_TRANSPORT:
2333 /* in case of transport mode, template does not store
2334 any IP addresses, hence we just compare mode and
2345 /* update endpoint address(es) of template(s) */
2346 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2347 struct xfrm_migrate *m, int num_migrate)
2349 struct xfrm_migrate *mp;
2350 struct dst_entry *dst;
2353 write_lock_bh(&pol->lock);
2354 if (unlikely(pol->dead)) {
2355 /* target policy has been deleted */
2356 write_unlock_bh(&pol->lock);
2360 for (i = 0; i < pol->xfrm_nr; i++) {
2361 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2362 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2365 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL)
2367 /* update endpoints */
2368 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2369 sizeof(pol->xfrm_vec[i].id.daddr));
2370 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2371 sizeof(pol->xfrm_vec[i].saddr));
2372 pol->xfrm_vec[i].encap_family = mp->new_family;
2374 while ((dst = pol->bundles) != NULL) {
2375 pol->bundles = dst->next;
2381 write_unlock_bh(&pol->lock);
2389 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2393 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2396 for (i = 0; i < num_migrate; i++) {
2397 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2398 m[i].old_family) == 0) &&
2399 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2400 m[i].old_family) == 0))
2402 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2403 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2406 /* check if there is any duplicated entry */
2407 for (j = i + 1; j < num_migrate; j++) {
2408 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2409 sizeof(m[i].old_daddr)) &&
2410 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2411 sizeof(m[i].old_saddr)) &&
2412 m[i].proto == m[j].proto &&
2413 m[i].mode == m[j].mode &&
2414 m[i].reqid == m[j].reqid &&
2415 m[i].old_family == m[j].old_family)
2423 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2424 struct xfrm_migrate *m, int num_migrate)
2426 int i, err, nx_cur = 0, nx_new = 0;
2427 struct xfrm_policy *pol = NULL;
2428 struct xfrm_state *x, *xc;
2429 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2430 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2431 struct xfrm_migrate *mp;
2433 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2436 /* Stage 1 - find policy */
2437 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2442 /* Stage 2 - find and update state(s) */
2443 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2444 if ((x = xfrm_migrate_state_find(mp))) {
2447 if ((xc = xfrm_state_migrate(x, mp))) {
2457 /* Stage 3 - update policy */
2458 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2461 /* Stage 4 - delete old state(s) */
2463 xfrm_states_put(x_cur, nx_cur);
2464 xfrm_states_delete(x_cur, nx_cur);
2467 /* Stage 5 - announce */
2468 km_migrate(sel, dir, type, m, num_migrate);
2480 xfrm_states_put(x_cur, nx_cur);
2482 xfrm_states_delete(x_new, nx_new);
2486 EXPORT_SYMBOL(xfrm_migrate);