YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * xfrm_policy.c |
| 3 | * |
| 4 | * Changes: |
| 5 | * Mitsuru KANDA @USAGI |
| 6 | * Kazunori MIYAZAWA @USAGI |
| 7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| 8 | * IPv6 support |
| 9 | * Kazunori MIYAZAWA @USAGI |
| 10 | * YOSHIFUJI Hideaki |
| 11 | * Split up af-specific portion |
| 12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 13 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 16 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 24 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 26 | #include <linux/cache.h> |
Paul Moore | 68277ac | 2007-12-20 20:49:33 -0800 | [diff] [blame] | 27 | #include <linux/audit.h> |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 28 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/xfrm.h> |
| 30 | #include <net/ip.h> |
Masahide NAKAMURA | 558f82e | 2007-12-20 20:42:57 -0800 | [diff] [blame] | 31 | #ifdef CONFIG_XFRM_STATISTICS |
| 32 | #include <net/snmp.h> |
| 33 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 35 | #include "xfrm_hash.h" |
| 36 | |
David S. Miller | 28faa97 | 2008-09-09 16:08:51 -0700 | [diff] [blame] | 37 | int sysctl_xfrm_larval_drop __read_mostly = 1; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 38 | |
Masahide NAKAMURA | 558f82e | 2007-12-20 20:42:57 -0800 | [diff] [blame] | 39 | #ifdef CONFIG_XFRM_STATISTICS |
| 40 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; |
| 41 | EXPORT_SYMBOL(xfrm_statistics); |
| 42 | #endif |
| 43 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 44 | DEFINE_MUTEX(xfrm_cfg_mutex); |
| 45 | EXPORT_SYMBOL(xfrm_cfg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | static DEFINE_RWLOCK(xfrm_policy_lock); |
| 48 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 49 | static struct list_head xfrm_policy_all; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 50 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
| 51 | EXPORT_SYMBOL(xfrm_policy_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
| 54 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; |
| 55 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 56 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | static struct work_struct xfrm_policy_gc_work; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 59 | static HLIST_HEAD(xfrm_policy_gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
| 61 | |
| 62 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); |
| 63 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 64 | static void xfrm_init_pmtu(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Andrew Morton | 7768102 | 2006-11-08 22:46:26 -0800 | [diff] [blame] | 66 | static inline int |
| 67 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 68 | { |
| 69 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && |
| 70 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && |
| 71 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 72 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 73 | (fl->proto == sel->proto || !sel->proto) && |
| 74 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 75 | } |
| 76 | |
| 77 | static inline int |
| 78 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 79 | { |
| 80 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && |
| 81 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && |
| 82 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 83 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 84 | (fl->proto == sel->proto || !sel->proto) && |
| 85 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 86 | } |
| 87 | |
| 88 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
| 89 | unsigned short family) |
| 90 | { |
| 91 | switch (family) { |
| 92 | case AF_INET: |
| 93 | return __xfrm4_selector_match(sel, fl); |
| 94 | case AF_INET6: |
| 95 | return __xfrm6_selector_match(sel, fl); |
| 96 | } |
| 97 | return 0; |
| 98 | } |
| 99 | |
YOSHIFUJI Hideaki | 9bb182a | 2008-02-22 14:48:22 +0900 | [diff] [blame] | 100 | static inline struct dst_entry *__xfrm_dst_lookup(int tos, |
| 101 | xfrm_address_t *saddr, |
| 102 | xfrm_address_t *daddr, |
| 103 | int family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 105 | struct xfrm_policy_afinfo *afinfo; |
| 106 | struct dst_entry *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 108 | afinfo = xfrm_policy_get_afinfo(family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | if (unlikely(afinfo == NULL)) |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 110 | return ERR_PTR(-EAFNOSUPPORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 112 | dst = afinfo->dst_lookup(tos, saddr, daddr); |
YOSHIFUJI Hideaki | 9bb182a | 2008-02-22 14:48:22 +0900 | [diff] [blame] | 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | xfrm_policy_put_afinfo(afinfo); |
YOSHIFUJI Hideaki | 9bb182a | 2008-02-22 14:48:22 +0900 | [diff] [blame] | 115 | |
| 116 | return dst; |
| 117 | } |
| 118 | |
| 119 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
| 120 | xfrm_address_t *prev_saddr, |
| 121 | xfrm_address_t *prev_daddr, |
| 122 | int family) |
| 123 | { |
| 124 | xfrm_address_t *saddr = &x->props.saddr; |
| 125 | xfrm_address_t *daddr = &x->id.daddr; |
| 126 | struct dst_entry *dst; |
| 127 | |
| 128 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
| 129 | saddr = x->coaddr; |
| 130 | daddr = prev_daddr; |
| 131 | } |
| 132 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { |
| 133 | saddr = prev_saddr; |
| 134 | daddr = x->coaddr; |
| 135 | } |
| 136 | |
| 137 | dst = __xfrm_dst_lookup(tos, saddr, daddr, family); |
| 138 | |
| 139 | if (!IS_ERR(dst)) { |
| 140 | if (prev_saddr != saddr) |
| 141 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); |
| 142 | if (prev_daddr != daddr) |
| 143 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); |
| 144 | } |
| 145 | |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 146 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | static inline unsigned long make_jiffies(long secs) |
| 150 | { |
| 151 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) |
| 152 | return MAX_SCHEDULE_TIMEOUT-1; |
| 153 | else |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 154 | return secs*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static void xfrm_policy_timer(unsigned long data) |
| 158 | { |
| 159 | struct xfrm_policy *xp = (struct xfrm_policy*)data; |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 160 | unsigned long now = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | long next = LONG_MAX; |
| 162 | int warn = 0; |
| 163 | int dir; |
| 164 | |
| 165 | read_lock(&xp->lock); |
| 166 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 167 | if (xp->walk.dead) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | goto out; |
| 169 | |
Herbert Xu | 77d8d7a | 2005-10-05 12:15:12 -0700 | [diff] [blame] | 170 | dir = xfrm_policy_id2dir(xp->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | if (xp->lft.hard_add_expires_seconds) { |
| 173 | long tmo = xp->lft.hard_add_expires_seconds + |
| 174 | xp->curlft.add_time - now; |
| 175 | if (tmo <= 0) |
| 176 | goto expired; |
| 177 | if (tmo < next) |
| 178 | next = tmo; |
| 179 | } |
| 180 | if (xp->lft.hard_use_expires_seconds) { |
| 181 | long tmo = xp->lft.hard_use_expires_seconds + |
| 182 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 183 | if (tmo <= 0) |
| 184 | goto expired; |
| 185 | if (tmo < next) |
| 186 | next = tmo; |
| 187 | } |
| 188 | if (xp->lft.soft_add_expires_seconds) { |
| 189 | long tmo = xp->lft.soft_add_expires_seconds + |
| 190 | xp->curlft.add_time - now; |
| 191 | if (tmo <= 0) { |
| 192 | warn = 1; |
| 193 | tmo = XFRM_KM_TIMEOUT; |
| 194 | } |
| 195 | if (tmo < next) |
| 196 | next = tmo; |
| 197 | } |
| 198 | if (xp->lft.soft_use_expires_seconds) { |
| 199 | long tmo = xp->lft.soft_use_expires_seconds + |
| 200 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 201 | if (tmo <= 0) { |
| 202 | warn = 1; |
| 203 | tmo = XFRM_KM_TIMEOUT; |
| 204 | } |
| 205 | if (tmo < next) |
| 206 | next = tmo; |
| 207 | } |
| 208 | |
| 209 | if (warn) |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 210 | km_policy_expired(xp, dir, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | if (next != LONG_MAX && |
| 212 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) |
| 213 | xfrm_pol_hold(xp); |
| 214 | |
| 215 | out: |
| 216 | read_unlock(&xp->lock); |
| 217 | xfrm_pol_put(xp); |
| 218 | return; |
| 219 | |
| 220 | expired: |
| 221 | read_unlock(&xp->lock); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 222 | if (!xfrm_policy_delete(xp, dir)) |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 223 | km_policy_expired(xp, dir, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | xfrm_pol_put(xp); |
| 225 | } |
| 226 | |
| 227 | |
| 228 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 |
| 229 | * SPD calls. |
| 230 | */ |
| 231 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 232 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
| 234 | struct xfrm_policy *policy; |
| 235 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 236 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | if (policy) { |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 239 | INIT_LIST_HEAD(&policy->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 240 | INIT_HLIST_NODE(&policy->bydst); |
| 241 | INIT_HLIST_NODE(&policy->byidx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | rwlock_init(&policy->lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 243 | atomic_set(&policy->refcnt, 1); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 244 | setup_timer(&policy->timer, xfrm_policy_timer, |
| 245 | (unsigned long)policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | return policy; |
| 248 | } |
| 249 | EXPORT_SYMBOL(xfrm_policy_alloc); |
| 250 | |
| 251 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ |
| 252 | |
WANG Cong | 64c31b3 | 2008-01-07 22:34:29 -0800 | [diff] [blame] | 253 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 255 | BUG_ON(!policy->walk.dead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 257 | BUG_ON(policy->bundles); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | if (del_timer(&policy->timer)) |
| 260 | BUG(); |
| 261 | |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 262 | security_xfrm_policy_free(policy->security); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | kfree(policy); |
| 264 | } |
WANG Cong | 64c31b3 | 2008-01-07 22:34:29 -0800 | [diff] [blame] | 265 | EXPORT_SYMBOL(xfrm_policy_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) |
| 268 | { |
| 269 | struct dst_entry *dst; |
| 270 | |
| 271 | while ((dst = policy->bundles) != NULL) { |
| 272 | policy->bundles = dst->next; |
| 273 | dst_free(dst); |
| 274 | } |
| 275 | |
| 276 | if (del_timer(&policy->timer)) |
| 277 | atomic_dec(&policy->refcnt); |
| 278 | |
| 279 | if (atomic_read(&policy->refcnt) > 1) |
| 280 | flow_cache_flush(); |
| 281 | |
| 282 | xfrm_pol_put(policy); |
| 283 | } |
| 284 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 285 | static void xfrm_policy_gc_task(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
| 287 | struct xfrm_policy *policy; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 288 | struct hlist_node *entry, *tmp; |
| 289 | struct hlist_head gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | spin_lock_bh(&xfrm_policy_gc_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 292 | gc_list.first = xfrm_policy_gc_list.first; |
| 293 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | spin_unlock_bh(&xfrm_policy_gc_lock); |
| 295 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 296 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | xfrm_policy_gc_kill(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | /* Rule must be locked. Release descentant resources, announce |
| 301 | * entry dead. The rule must be unlinked from lists to the moment. |
| 302 | */ |
| 303 | |
| 304 | static void xfrm_policy_kill(struct xfrm_policy *policy) |
| 305 | { |
| 306 | int dead; |
| 307 | |
| 308 | write_lock_bh(&policy->lock); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 309 | dead = policy->walk.dead; |
| 310 | policy->walk.dead = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | write_unlock_bh(&policy->lock); |
| 312 | |
| 313 | if (unlikely(dead)) { |
| 314 | WARN_ON(1); |
| 315 | return; |
| 316 | } |
| 317 | |
Alexey Dobriyan | bbb770e | 2008-11-03 19:11:29 -0800 | [diff] [blame] | 318 | spin_lock_bh(&xfrm_policy_gc_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 319 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
Alexey Dobriyan | bbb770e | 2008-11-03 19:11:29 -0800 | [diff] [blame] | 320 | spin_unlock_bh(&xfrm_policy_gc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | schedule_work(&xfrm_policy_gc_work); |
| 323 | } |
| 324 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 325 | struct xfrm_policy_hash { |
| 326 | struct hlist_head *table; |
| 327 | unsigned int hmask; |
| 328 | }; |
| 329 | |
| 330 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; |
| 331 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; |
| 332 | static struct hlist_head *xfrm_policy_byidx __read_mostly; |
| 333 | static unsigned int xfrm_idx_hmask __read_mostly; |
| 334 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
| 335 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 336 | static inline unsigned int idx_hash(u32 index) |
| 337 | { |
| 338 | return __idx_hash(index, xfrm_idx_hmask); |
| 339 | } |
| 340 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 341 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
| 342 | { |
| 343 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 344 | unsigned int hash = __sel_hash(sel, family, hmask); |
| 345 | |
| 346 | return (hash == hmask + 1 ? |
| 347 | &xfrm_policy_inexact[dir] : |
| 348 | xfrm_policy_bydst[dir].table + hash); |
| 349 | } |
| 350 | |
| 351 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
| 352 | { |
| 353 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 354 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
| 355 | |
| 356 | return xfrm_policy_bydst[dir].table + hash; |
| 357 | } |
| 358 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 359 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
| 360 | struct hlist_head *ndsttable, |
| 361 | unsigned int nhashmask) |
| 362 | { |
YOSHIFUJI Hideaki | b791160 | 2008-02-17 23:29:30 -0800 | [diff] [blame] | 363 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 364 | struct xfrm_policy *pol; |
YOSHIFUJI Hideaki | b791160 | 2008-02-17 23:29:30 -0800 | [diff] [blame] | 365 | unsigned int h0 = 0; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 366 | |
YOSHIFUJI Hideaki | b791160 | 2008-02-17 23:29:30 -0800 | [diff] [blame] | 367 | redo: |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 368 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
| 369 | unsigned int h; |
| 370 | |
| 371 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
| 372 | pol->family, nhashmask); |
YOSHIFUJI Hideaki | b791160 | 2008-02-17 23:29:30 -0800 | [diff] [blame] | 373 | if (!entry0) { |
| 374 | hlist_del(entry); |
| 375 | hlist_add_head(&pol->bydst, ndsttable+h); |
| 376 | h0 = h; |
| 377 | } else { |
| 378 | if (h != h0) |
| 379 | continue; |
| 380 | hlist_del(entry); |
| 381 | hlist_add_after(entry0, &pol->bydst); |
| 382 | } |
| 383 | entry0 = entry; |
| 384 | } |
| 385 | if (!hlist_empty(list)) { |
| 386 | entry0 = NULL; |
| 387 | goto redo; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 388 | } |
| 389 | } |
| 390 | |
| 391 | static void xfrm_idx_hash_transfer(struct hlist_head *list, |
| 392 | struct hlist_head *nidxtable, |
| 393 | unsigned int nhashmask) |
| 394 | { |
| 395 | struct hlist_node *entry, *tmp; |
| 396 | struct xfrm_policy *pol; |
| 397 | |
| 398 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { |
| 399 | unsigned int h; |
| 400 | |
| 401 | h = __idx_hash(pol->index, nhashmask); |
| 402 | hlist_add_head(&pol->byidx, nidxtable+h); |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) |
| 407 | { |
| 408 | return ((old_hmask + 1) << 1) - 1; |
| 409 | } |
| 410 | |
| 411 | static void xfrm_bydst_resize(int dir) |
| 412 | { |
| 413 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 414 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 415 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 416 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 417 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 418 | int i; |
| 419 | |
| 420 | if (!ndst) |
| 421 | return; |
| 422 | |
| 423 | write_lock_bh(&xfrm_policy_lock); |
| 424 | |
| 425 | for (i = hmask; i >= 0; i--) |
| 426 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); |
| 427 | |
| 428 | xfrm_policy_bydst[dir].table = ndst; |
| 429 | xfrm_policy_bydst[dir].hmask = nhashmask; |
| 430 | |
| 431 | write_unlock_bh(&xfrm_policy_lock); |
| 432 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 433 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | static void xfrm_byidx_resize(int total) |
| 437 | { |
| 438 | unsigned int hmask = xfrm_idx_hmask; |
| 439 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 440 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 441 | struct hlist_head *oidx = xfrm_policy_byidx; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 442 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 443 | int i; |
| 444 | |
| 445 | if (!nidx) |
| 446 | return; |
| 447 | |
| 448 | write_lock_bh(&xfrm_policy_lock); |
| 449 | |
| 450 | for (i = hmask; i >= 0; i--) |
| 451 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); |
| 452 | |
| 453 | xfrm_policy_byidx = nidx; |
| 454 | xfrm_idx_hmask = nhashmask; |
| 455 | |
| 456 | write_unlock_bh(&xfrm_policy_lock); |
| 457 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 458 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 459 | } |
| 460 | |
| 461 | static inline int xfrm_bydst_should_resize(int dir, int *total) |
| 462 | { |
| 463 | unsigned int cnt = xfrm_policy_count[dir]; |
| 464 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 465 | |
| 466 | if (total) |
| 467 | *total += cnt; |
| 468 | |
| 469 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 470 | cnt > hmask) |
| 471 | return 1; |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static inline int xfrm_byidx_should_resize(int total) |
| 477 | { |
| 478 | unsigned int hmask = xfrm_idx_hmask; |
| 479 | |
| 480 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 481 | total > hmask) |
| 482 | return 1; |
| 483 | |
| 484 | return 0; |
| 485 | } |
| 486 | |
Jamal Hadi Salim | 5a6d341 | 2007-05-04 12:55:39 -0700 | [diff] [blame] | 487 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
Jamal Hadi Salim | ecfd6b1 | 2007-04-28 21:20:32 -0700 | [diff] [blame] | 488 | { |
| 489 | read_lock_bh(&xfrm_policy_lock); |
| 490 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; |
| 491 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; |
| 492 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; |
| 493 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; |
| 494 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; |
| 495 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; |
| 496 | si->spdhcnt = xfrm_idx_hmask; |
| 497 | si->spdhmcnt = xfrm_policy_hashmax; |
| 498 | read_unlock_bh(&xfrm_policy_lock); |
| 499 | } |
| 500 | EXPORT_SYMBOL(xfrm_spd_getinfo); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 501 | |
Jamal Hadi Salim | ecfd6b1 | 2007-04-28 21:20:32 -0700 | [diff] [blame] | 502 | static DEFINE_MUTEX(hash_resize_mutex); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 503 | static void xfrm_hash_resize(struct work_struct *__unused) |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 504 | { |
| 505 | int dir, total; |
| 506 | |
| 507 | mutex_lock(&hash_resize_mutex); |
| 508 | |
| 509 | total = 0; |
| 510 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 511 | if (xfrm_bydst_should_resize(dir, &total)) |
| 512 | xfrm_bydst_resize(dir); |
| 513 | } |
| 514 | if (xfrm_byidx_should_resize(total)) |
| 515 | xfrm_byidx_resize(total); |
| 516 | |
| 517 | mutex_unlock(&hash_resize_mutex); |
| 518 | } |
| 519 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 520 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | /* Generate new index... KAME seems to generate them ordered by cost |
| 523 | * of an absolute inpredictability of ordering of rules. This will not pass. */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 524 | static u32 xfrm_gen_index(u8 type, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | static u32 idx_generator; |
| 527 | |
| 528 | for (;;) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 529 | struct hlist_node *entry; |
| 530 | struct hlist_head *list; |
| 531 | struct xfrm_policy *p; |
| 532 | u32 idx; |
| 533 | int found; |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | idx = (idx_generator | dir); |
| 536 | idx_generator += 8; |
| 537 | if (idx == 0) |
| 538 | idx = 8; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 539 | list = xfrm_policy_byidx + idx_hash(idx); |
| 540 | found = 0; |
| 541 | hlist_for_each_entry(p, entry, list, byidx) { |
| 542 | if (p->index == idx) { |
| 543 | found = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | break; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 547 | if (!found) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return idx; |
| 549 | } |
| 550 | } |
| 551 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 552 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
| 553 | { |
| 554 | u32 *p1 = (u32 *) s1; |
| 555 | u32 *p2 = (u32 *) s2; |
| 556 | int len = sizeof(struct xfrm_selector) / sizeof(u32); |
| 557 | int i; |
| 558 | |
| 559 | for (i = 0; i < len; i++) { |
| 560 | if (p1[i] != p2[i]) |
| 561 | return 1; |
| 562 | } |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
| 568 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 569 | struct xfrm_policy *pol; |
| 570 | struct xfrm_policy *delpol; |
| 571 | struct hlist_head *chain; |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 572 | struct hlist_node *entry, *newpos; |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 573 | struct dst_entry *gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 576 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
| 577 | delpol = NULL; |
| 578 | newpos = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 579 | hlist_for_each_entry(pol, entry, chain, bydst) { |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 580 | if (pol->type == policy->type && |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 581 | !selector_cmp(&pol->selector, &policy->selector) && |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 582 | xfrm_sec_ctx_match(pol->security, policy->security) && |
| 583 | !WARN_ON(delpol)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (excl) { |
| 585 | write_unlock_bh(&xfrm_policy_lock); |
| 586 | return -EEXIST; |
| 587 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | delpol = pol; |
| 589 | if (policy->priority > pol->priority) |
| 590 | continue; |
| 591 | } else if (policy->priority >= pol->priority) { |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 592 | newpos = &pol->bydst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | continue; |
| 594 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | if (delpol) |
| 596 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | if (newpos) |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 599 | hlist_add_after(newpos, &policy->bydst); |
| 600 | else |
| 601 | hlist_add_head(&policy->bydst, chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | xfrm_pol_hold(policy); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 603 | xfrm_policy_count[dir]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 605 | if (delpol) { |
| 606 | hlist_del(&delpol->bydst); |
| 607 | hlist_del(&delpol->byidx); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 608 | list_del(&delpol->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 609 | xfrm_policy_count[dir]--; |
| 610 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 611 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 612 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 613 | policy->curlft.add_time = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | policy->curlft.use_time = 0; |
| 615 | if (!mod_timer(&policy->timer, jiffies + HZ)) |
| 616 | xfrm_pol_hold(policy); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 617 | list_add(&policy->walk.all, &xfrm_policy_all); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | write_unlock_bh(&xfrm_policy_lock); |
| 619 | |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 620 | if (delpol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | xfrm_policy_kill(delpol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 622 | else if (xfrm_bydst_should_resize(dir, NULL)) |
| 623 | schedule_work(&xfrm_hash_work); |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 624 | |
| 625 | read_lock_bh(&xfrm_policy_lock); |
| 626 | gc_list = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 627 | entry = &policy->bydst; |
| 628 | hlist_for_each_entry_continue(policy, entry, bydst) { |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 629 | struct dst_entry *dst; |
| 630 | |
| 631 | write_lock(&policy->lock); |
| 632 | dst = policy->bundles; |
| 633 | if (dst) { |
| 634 | struct dst_entry *tail = dst; |
| 635 | while (tail->next) |
| 636 | tail = tail->next; |
| 637 | tail->next = gc_list; |
| 638 | gc_list = dst; |
| 639 | |
| 640 | policy->bundles = NULL; |
| 641 | } |
| 642 | write_unlock(&policy->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 644 | read_unlock_bh(&xfrm_policy_lock); |
| 645 | |
| 646 | while (gc_list) { |
| 647 | struct dst_entry *dst = gc_list; |
| 648 | |
| 649 | gc_list = dst->next; |
| 650 | dst_free(dst); |
| 651 | } |
| 652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | return 0; |
| 654 | } |
| 655 | EXPORT_SYMBOL(xfrm_policy_insert); |
| 656 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 657 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
| 658 | struct xfrm_selector *sel, |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 659 | struct xfrm_sec_ctx *ctx, int delete, |
| 660 | int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 662 | struct xfrm_policy *pol, *ret; |
| 663 | struct hlist_head *chain; |
| 664 | struct hlist_node *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 666 | *err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 668 | chain = policy_hash_bysel(sel, sel->family, dir); |
| 669 | ret = NULL; |
| 670 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 671 | if (pol->type == type && |
| 672 | !selector_cmp(sel, &pol->selector) && |
| 673 | xfrm_sec_ctx_match(ctx, pol->security)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 675 | if (delete) { |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 676 | *err = security_xfrm_policy_delete( |
| 677 | pol->security); |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 678 | if (*err) { |
| 679 | write_unlock_bh(&xfrm_policy_lock); |
| 680 | return pol; |
| 681 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 682 | hlist_del(&pol->bydst); |
| 683 | hlist_del(&pol->byidx); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 684 | list_del(&pol->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 685 | xfrm_policy_count[dir]--; |
| 686 | } |
| 687 | ret = pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | break; |
| 689 | } |
| 690 | } |
| 691 | write_unlock_bh(&xfrm_policy_lock); |
| 692 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 693 | if (ret && delete) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 695 | xfrm_policy_kill(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 697 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 699 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 701 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
| 702 | int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 704 | struct xfrm_policy *pol, *ret; |
| 705 | struct hlist_head *chain; |
| 706 | struct hlist_node *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Herbert Xu | b5505c6 | 2007-05-14 02:15:47 -0700 | [diff] [blame] | 708 | *err = -ENOENT; |
| 709 | if (xfrm_policy_id2dir(id) != dir) |
| 710 | return NULL; |
| 711 | |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 712 | *err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 714 | chain = xfrm_policy_byidx + idx_hash(id); |
| 715 | ret = NULL; |
| 716 | hlist_for_each_entry(pol, entry, chain, byidx) { |
| 717 | if (pol->type == type && pol->index == id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 719 | if (delete) { |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 720 | *err = security_xfrm_policy_delete( |
| 721 | pol->security); |
Eric Paris | ef41aaa | 2007-03-07 15:37:58 -0800 | [diff] [blame] | 722 | if (*err) { |
| 723 | write_unlock_bh(&xfrm_policy_lock); |
| 724 | return pol; |
| 725 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 726 | hlist_del(&pol->bydst); |
| 727 | hlist_del(&pol->byidx); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 728 | list_del(&pol->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 729 | xfrm_policy_count[dir]--; |
| 730 | } |
| 731 | ret = pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | break; |
| 733 | } |
| 734 | } |
| 735 | write_unlock_bh(&xfrm_policy_lock); |
| 736 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 737 | if (ret && delete) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 739 | xfrm_policy_kill(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 741 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | EXPORT_SYMBOL(xfrm_policy_byid); |
| 744 | |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 745 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 746 | static inline int |
| 747 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | { |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 749 | int dir, err = 0; |
| 750 | |
| 751 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
| 752 | struct xfrm_policy *pol; |
| 753 | struct hlist_node *entry; |
| 754 | int i; |
| 755 | |
| 756 | hlist_for_each_entry(pol, entry, |
| 757 | &xfrm_policy_inexact[dir], bydst) { |
| 758 | if (pol->type != type) |
| 759 | continue; |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 760 | err = security_xfrm_policy_delete(pol->security); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 761 | if (err) { |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 762 | xfrm_audit_policy_delete(pol, 0, |
| 763 | audit_info->loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 764 | audit_info->sessionid, |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 765 | audit_info->secid); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 766 | return err; |
| 767 | } |
YOSHIFUJI Hideaki | 7dc12d6 | 2007-07-19 10:45:15 +0900 | [diff] [blame] | 768 | } |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 769 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 770 | hlist_for_each_entry(pol, entry, |
| 771 | xfrm_policy_bydst[dir].table + i, |
| 772 | bydst) { |
| 773 | if (pol->type != type) |
| 774 | continue; |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 775 | err = security_xfrm_policy_delete( |
| 776 | pol->security); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 777 | if (err) { |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 778 | xfrm_audit_policy_delete(pol, 0, |
| 779 | audit_info->loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 780 | audit_info->sessionid, |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 781 | audit_info->secid); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 782 | return err; |
| 783 | } |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | return err; |
| 788 | } |
| 789 | #else |
| 790 | static inline int |
| 791 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) |
| 792 | { |
| 793 | return 0; |
| 794 | } |
| 795 | #endif |
| 796 | |
| 797 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
| 798 | { |
| 799 | int dir, err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | write_lock_bh(&xfrm_policy_lock); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 802 | |
| 803 | err = xfrm_policy_flush_secctx_check(type, audit_info); |
| 804 | if (err) |
| 805 | goto out; |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 808 | struct xfrm_policy *pol; |
| 809 | struct hlist_node *entry; |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 810 | int i, killed; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 811 | |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 812 | killed = 0; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 813 | again1: |
| 814 | hlist_for_each_entry(pol, entry, |
| 815 | &xfrm_policy_inexact[dir], bydst) { |
| 816 | if (pol->type != type) |
| 817 | continue; |
| 818 | hlist_del(&pol->bydst); |
| 819 | hlist_del(&pol->byidx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | write_unlock_bh(&xfrm_policy_lock); |
| 821 | |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 822 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 823 | audit_info->sessionid, |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 824 | audit_info->secid); |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 825 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 826 | xfrm_policy_kill(pol); |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 827 | killed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
| 829 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 830 | goto again1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 832 | |
| 833 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 834 | again2: |
| 835 | hlist_for_each_entry(pol, entry, |
| 836 | xfrm_policy_bydst[dir].table + i, |
| 837 | bydst) { |
| 838 | if (pol->type != type) |
| 839 | continue; |
| 840 | hlist_del(&pol->bydst); |
| 841 | hlist_del(&pol->byidx); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 842 | list_del(&pol->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 843 | write_unlock_bh(&xfrm_policy_lock); |
| 844 | |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 845 | xfrm_audit_policy_delete(pol, 1, |
| 846 | audit_info->loginuid, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 847 | audit_info->sessionid, |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 848 | audit_info->secid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 849 | xfrm_policy_kill(pol); |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 850 | killed++; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 851 | |
| 852 | write_lock_bh(&xfrm_policy_lock); |
| 853 | goto again2; |
| 854 | } |
| 855 | } |
| 856 | |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 857 | xfrm_policy_count[dir] -= killed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | atomic_inc(&flow_cache_genid); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 860 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | write_unlock_bh(&xfrm_policy_lock); |
Joy Latten | 4aa2e62 | 2007-06-04 19:05:57 -0400 | [diff] [blame] | 862 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | EXPORT_SYMBOL(xfrm_policy_flush); |
| 865 | |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 866 | int xfrm_policy_walk(struct xfrm_policy_walk *walk, |
| 867 | int (*func)(struct xfrm_policy *, int, int, void*), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | void *data) |
| 869 | { |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 870 | struct xfrm_policy *pol; |
| 871 | struct xfrm_policy_walk_entry *x; |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 872 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 874 | if (walk->type >= XFRM_POLICY_TYPE_MAX && |
| 875 | walk->type != XFRM_POLICY_TYPE_ANY) |
| 876 | return -EINVAL; |
| 877 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 878 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 879 | return 0; |
| 880 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 881 | write_lock_bh(&xfrm_policy_lock); |
| 882 | if (list_empty(&walk->walk.all)) |
| 883 | x = list_first_entry(&xfrm_policy_all, struct xfrm_policy_walk_entry, all); |
| 884 | else |
| 885 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); |
| 886 | list_for_each_entry_from(x, &xfrm_policy_all, all) { |
| 887 | if (x->dead) |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 888 | continue; |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 889 | pol = container_of(x, struct xfrm_policy, walk); |
| 890 | if (walk->type != XFRM_POLICY_TYPE_ANY && |
| 891 | walk->type != pol->type) |
| 892 | continue; |
| 893 | error = func(pol, xfrm_policy_id2dir(pol->index), |
| 894 | walk->seq, data); |
| 895 | if (error) { |
| 896 | list_move_tail(&walk->walk.all, &x->all); |
| 897 | goto out; |
Timo Teras | 4c563f7 | 2008-02-28 21:31:08 -0800 | [diff] [blame] | 898 | } |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 899 | walk->seq++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | } |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 901 | if (walk->seq == 0) { |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 902 | error = -ENOENT; |
| 903 | goto out; |
| 904 | } |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 905 | list_del_init(&walk->walk.all); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | out: |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 907 | write_unlock_bh(&xfrm_policy_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | return error; |
| 909 | } |
| 910 | EXPORT_SYMBOL(xfrm_policy_walk); |
| 911 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 912 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
| 913 | { |
| 914 | INIT_LIST_HEAD(&walk->walk.all); |
| 915 | walk->walk.dead = 1; |
| 916 | walk->type = type; |
| 917 | walk->seq = 0; |
| 918 | } |
| 919 | EXPORT_SYMBOL(xfrm_policy_walk_init); |
| 920 | |
| 921 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) |
| 922 | { |
| 923 | if (list_empty(&walk->walk.all)) |
| 924 | return; |
| 925 | |
| 926 | write_lock_bh(&xfrm_policy_lock); |
| 927 | list_del(&walk->walk.all); |
| 928 | write_unlock_bh(&xfrm_policy_lock); |
| 929 | } |
| 930 | EXPORT_SYMBOL(xfrm_policy_walk_done); |
| 931 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 932 | /* |
| 933 | * Find policy to apply to this flow. |
| 934 | * |
| 935 | * Returns 0 if policy found, else an -errno. |
| 936 | */ |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 937 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
| 938 | u8 type, u16 family, int dir) |
| 939 | { |
| 940 | struct xfrm_selector *sel = &pol->selector; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 941 | int match, ret = -ESRCH; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 942 | |
| 943 | if (pol->family != family || |
| 944 | pol->type != type) |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 945 | return ret; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 946 | |
| 947 | match = xfrm_selector_match(sel, fl, family); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 948 | if (match) |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 949 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
| 950 | dir); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 951 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 952 | return ret; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 953 | } |
| 954 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 955 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
| 956 | u16 family, u8 dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 958 | int err; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 959 | struct xfrm_policy *pol, *ret; |
| 960 | xfrm_address_t *daddr, *saddr; |
| 961 | struct hlist_node *entry; |
| 962 | struct hlist_head *chain; |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 963 | u32 priority = ~0U; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 964 | |
| 965 | daddr = xfrm_flowi_daddr(fl, family); |
| 966 | saddr = xfrm_flowi_saddr(fl, family); |
| 967 | if (unlikely(!daddr || !saddr)) |
| 968 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
| 970 | read_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 971 | chain = policy_hash_direct(daddr, saddr, family, dir); |
| 972 | ret = NULL; |
| 973 | hlist_for_each_entry(pol, entry, chain, bydst) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 974 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 975 | if (err) { |
| 976 | if (err == -ESRCH) |
| 977 | continue; |
| 978 | else { |
| 979 | ret = ERR_PTR(err); |
| 980 | goto fail; |
| 981 | } |
| 982 | } else { |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 983 | ret = pol; |
| 984 | priority = ret->priority; |
| 985 | break; |
| 986 | } |
| 987 | } |
| 988 | chain = &xfrm_policy_inexact[dir]; |
| 989 | hlist_for_each_entry(pol, entry, chain, bydst) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 990 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 991 | if (err) { |
| 992 | if (err == -ESRCH) |
| 993 | continue; |
| 994 | else { |
| 995 | ret = ERR_PTR(err); |
| 996 | goto fail; |
| 997 | } |
| 998 | } else if (pol->priority < priority) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 999 | ret = pol; |
| 1000 | break; |
| 1001 | } |
| 1002 | } |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 1003 | if (ret) |
| 1004 | xfrm_pol_hold(ret); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1005 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | read_unlock_bh(&xfrm_policy_lock); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1007 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1008 | return ret; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1009 | } |
| 1010 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1011 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1012 | void **objp, atomic_t **obj_refp) |
| 1013 | { |
| 1014 | struct xfrm_policy *pol; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1015 | int err = 0; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1016 | |
| 1017 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1018 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1019 | if (IS_ERR(pol)) { |
| 1020 | err = PTR_ERR(pol); |
| 1021 | pol = NULL; |
| 1022 | } |
| 1023 | if (pol || err) |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1024 | goto end; |
| 1025 | #endif |
| 1026 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1027 | if (IS_ERR(pol)) { |
| 1028 | err = PTR_ERR(pol); |
| 1029 | pol = NULL; |
| 1030 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1031 | #ifdef CONFIG_XFRM_SUB_POLICY |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1032 | end: |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1033 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | if ((*objp = (void *) pol) != NULL) |
| 1035 | *obj_refp = &pol->refcnt; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1036 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | } |
| 1038 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1039 | static inline int policy_to_flow_dir(int dir) |
| 1040 | { |
| 1041 | if (XFRM_POLICY_IN == FLOW_DIR_IN && |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1042 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
| 1043 | XFRM_POLICY_FWD == FLOW_DIR_FWD) |
| 1044 | return dir; |
| 1045 | switch (dir) { |
| 1046 | default: |
| 1047 | case XFRM_POLICY_IN: |
| 1048 | return FLOW_DIR_IN; |
| 1049 | case XFRM_POLICY_OUT: |
| 1050 | return FLOW_DIR_OUT; |
| 1051 | case XFRM_POLICY_FWD: |
| 1052 | return FLOW_DIR_FWD; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1053 | } |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1054 | } |
| 1055 | |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1056 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | { |
| 1058 | struct xfrm_policy *pol; |
| 1059 | |
| 1060 | read_lock_bh(&xfrm_policy_lock); |
| 1061 | if ((pol = sk->sk_policy[dir]) != NULL) { |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1062 | int match = xfrm_selector_match(&pol->selector, fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | sk->sk_family); |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1064 | int err = 0; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1065 | |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1066 | if (match) { |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 1067 | err = security_xfrm_policy_lookup(pol->security, |
| 1068 | fl->secid, |
| 1069 | policy_to_flow_dir(dir)); |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1070 | if (!err) |
| 1071 | xfrm_pol_hold(pol); |
| 1072 | else if (err == -ESRCH) |
| 1073 | pol = NULL; |
| 1074 | else |
| 1075 | pol = ERR_PTR(err); |
| 1076 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | pol = NULL; |
| 1078 | } |
| 1079 | read_unlock_bh(&xfrm_policy_lock); |
| 1080 | return pol; |
| 1081 | } |
| 1082 | |
| 1083 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) |
| 1084 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1085 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
| 1086 | pol->family, dir); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1087 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 1088 | list_add(&pol->walk.all, &xfrm_policy_all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1089 | hlist_add_head(&pol->bydst, chain); |
| 1090 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); |
| 1091 | xfrm_policy_count[dir]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1093 | |
| 1094 | if (xfrm_bydst_should_resize(dir, NULL)) |
| 1095 | schedule_work(&xfrm_hash_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | } |
| 1097 | |
| 1098 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| 1099 | int dir) |
| 1100 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1101 | if (hlist_unhashed(&pol->bydst)) |
| 1102 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1104 | hlist_del(&pol->bydst); |
| 1105 | hlist_del(&pol->byidx); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 1106 | list_del(&pol->walk.all); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1107 | xfrm_policy_count[dir]--; |
| 1108 | |
| 1109 | return pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } |
| 1111 | |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1112 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | { |
| 1114 | write_lock_bh(&xfrm_policy_lock); |
| 1115 | pol = __xfrm_policy_unlink(pol, dir); |
| 1116 | write_unlock_bh(&xfrm_policy_lock); |
| 1117 | if (pol) { |
| 1118 | if (dir < XFRM_POLICY_MAX) |
| 1119 | atomic_inc(&flow_cache_genid); |
| 1120 | xfrm_policy_kill(pol); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1121 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | } |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1123 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | } |
David S. Miller | a70fcb0 | 2006-03-20 19:18:52 -0800 | [diff] [blame] | 1125 | EXPORT_SYMBOL(xfrm_policy_delete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
| 1127 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) |
| 1128 | { |
| 1129 | struct xfrm_policy *old_pol; |
| 1130 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1131 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1132 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) |
| 1133 | return -EINVAL; |
| 1134 | #endif |
| 1135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | write_lock_bh(&xfrm_policy_lock); |
| 1137 | old_pol = sk->sk_policy[dir]; |
| 1138 | sk->sk_policy[dir] = pol; |
| 1139 | if (pol) { |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1140 | pol->curlft.add_time = get_seconds(); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1141 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
| 1143 | } |
| 1144 | if (old_pol) |
| 1145 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
| 1146 | write_unlock_bh(&xfrm_policy_lock); |
| 1147 | |
| 1148 | if (old_pol) { |
| 1149 | xfrm_policy_kill(old_pol); |
| 1150 | } |
| 1151 | return 0; |
| 1152 | } |
| 1153 | |
| 1154 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) |
| 1155 | { |
| 1156 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); |
| 1157 | |
| 1158 | if (newp) { |
| 1159 | newp->selector = old->selector; |
Paul Moore | 03e1ad7 | 2008-04-12 19:07:52 -0700 | [diff] [blame] | 1160 | if (security_xfrm_policy_clone(old->security, |
| 1161 | &newp->security)) { |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1162 | kfree(newp); |
| 1163 | return NULL; /* ENOMEM */ |
| 1164 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | newp->lft = old->lft; |
| 1166 | newp->curlft = old->curlft; |
| 1167 | newp->action = old->action; |
| 1168 | newp->flags = old->flags; |
| 1169 | newp->xfrm_nr = old->xfrm_nr; |
| 1170 | newp->index = old->index; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1171 | newp->type = old->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
| 1173 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); |
| 1174 | write_lock_bh(&xfrm_policy_lock); |
| 1175 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
| 1176 | write_unlock_bh(&xfrm_policy_lock); |
| 1177 | xfrm_pol_put(newp); |
| 1178 | } |
| 1179 | return newp; |
| 1180 | } |
| 1181 | |
| 1182 | int __xfrm_sk_clone_policy(struct sock *sk) |
| 1183 | { |
| 1184 | struct xfrm_policy *p0 = sk->sk_policy[0], |
| 1185 | *p1 = sk->sk_policy[1]; |
| 1186 | |
| 1187 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; |
| 1188 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) |
| 1189 | return -ENOMEM; |
| 1190 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) |
| 1191 | return -ENOMEM; |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1195 | static int |
| 1196 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, |
| 1197 | unsigned short family) |
| 1198 | { |
| 1199 | int err; |
| 1200 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1201 | |
| 1202 | if (unlikely(afinfo == NULL)) |
| 1203 | return -EINVAL; |
| 1204 | err = afinfo->get_saddr(local, remote); |
| 1205 | xfrm_policy_put_afinfo(afinfo); |
| 1206 | return err; |
| 1207 | } |
| 1208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | /* Resolve list of templates for the flow, given policy. */ |
| 1210 | |
| 1211 | static int |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1212 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
| 1213 | struct xfrm_state **xfrm, |
| 1214 | unsigned short family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | { |
| 1216 | int nx; |
| 1217 | int i, error; |
| 1218 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); |
| 1219 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1220 | xfrm_address_t tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
| 1222 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { |
| 1223 | struct xfrm_state *x; |
| 1224 | xfrm_address_t *remote = daddr; |
| 1225 | xfrm_address_t *local = saddr; |
| 1226 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; |
| 1227 | |
Joakim Koskela | 48b8d78 | 2007-07-26 00:08:42 -0700 | [diff] [blame] | 1228 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
| 1229 | tmpl->mode == XFRM_MODE_BEET) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | remote = &tmpl->id.daddr; |
| 1231 | local = &tmpl->saddr; |
Miika Komu | 76b3f05 | 2006-11-30 16:40:43 -0800 | [diff] [blame] | 1232 | family = tmpl->encap_family; |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1233 | if (xfrm_addr_any(local, family)) { |
| 1234 | error = xfrm_get_saddr(&tmp, remote, family); |
| 1235 | if (error) |
| 1236 | goto fail; |
| 1237 | local = &tmp; |
| 1238 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | } |
| 1240 | |
| 1241 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); |
| 1242 | |
| 1243 | if (x && x->km.state == XFRM_STATE_VALID) { |
| 1244 | xfrm[nx++] = x; |
| 1245 | daddr = remote; |
| 1246 | saddr = local; |
| 1247 | continue; |
| 1248 | } |
| 1249 | if (x) { |
| 1250 | error = (x->km.state == XFRM_STATE_ERROR ? |
| 1251 | -EINVAL : -EAGAIN); |
| 1252 | xfrm_state_put(x); |
| 1253 | } |
fernando@oss.ntt.co | a4322266 | 2008-10-23 04:27:19 +0000 | [diff] [blame] | 1254 | else if (error == -ESRCH) |
| 1255 | error = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
| 1257 | if (!tmpl->optional) |
| 1258 | goto fail; |
| 1259 | } |
| 1260 | return nx; |
| 1261 | |
| 1262 | fail: |
| 1263 | for (nx--; nx>=0; nx--) |
| 1264 | xfrm_state_put(xfrm[nx]); |
| 1265 | return error; |
| 1266 | } |
| 1267 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1268 | static int |
| 1269 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, |
| 1270 | struct xfrm_state **xfrm, |
| 1271 | unsigned short family) |
| 1272 | { |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1273 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
| 1274 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1275 | int cnx = 0; |
| 1276 | int error; |
| 1277 | int ret; |
| 1278 | int i; |
| 1279 | |
| 1280 | for (i = 0; i < npols; i++) { |
| 1281 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { |
| 1282 | error = -ENOBUFS; |
| 1283 | goto fail; |
| 1284 | } |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1285 | |
| 1286 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1287 | if (ret < 0) { |
| 1288 | error = ret; |
| 1289 | goto fail; |
| 1290 | } else |
| 1291 | cnx += ret; |
| 1292 | } |
| 1293 | |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1294 | /* found states are sorted for outbound processing */ |
| 1295 | if (npols > 1) |
| 1296 | xfrm_state_sort(xfrm, tpp, cnx, family); |
| 1297 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1298 | return cnx; |
| 1299 | |
| 1300 | fail: |
| 1301 | for (cnx--; cnx>=0; cnx--) |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1302 | xfrm_state_put(tpp[cnx]); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1303 | return error; |
| 1304 | |
| 1305 | } |
| 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | /* Check that the bundle accepts the flow and its components are |
| 1308 | * still valid. |
| 1309 | */ |
| 1310 | |
| 1311 | static struct dst_entry * |
| 1312 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) |
| 1313 | { |
| 1314 | struct dst_entry *x; |
| 1315 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1316 | if (unlikely(afinfo == NULL)) |
| 1317 | return ERR_PTR(-EINVAL); |
| 1318 | x = afinfo->find_bundle(fl, policy); |
| 1319 | xfrm_policy_put_afinfo(afinfo); |
| 1320 | return x; |
| 1321 | } |
| 1322 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1323 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
| 1324 | { |
| 1325 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1326 | int tos; |
| 1327 | |
| 1328 | if (!afinfo) |
| 1329 | return -EINVAL; |
| 1330 | |
| 1331 | tos = afinfo->get_tos(fl); |
| 1332 | |
| 1333 | xfrm_policy_put_afinfo(afinfo); |
| 1334 | |
| 1335 | return tos; |
| 1336 | } |
| 1337 | |
| 1338 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) |
| 1339 | { |
| 1340 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1341 | struct xfrm_dst *xdst; |
| 1342 | |
| 1343 | if (!afinfo) |
| 1344 | return ERR_PTR(-EINVAL); |
| 1345 | |
| 1346 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); |
| 1347 | |
| 1348 | xfrm_policy_put_afinfo(afinfo); |
| 1349 | |
| 1350 | return xdst; |
| 1351 | } |
| 1352 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1353 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
| 1354 | int nfheader_len) |
| 1355 | { |
| 1356 | struct xfrm_policy_afinfo *afinfo = |
| 1357 | xfrm_policy_get_afinfo(dst->ops->family); |
| 1358 | int err; |
| 1359 | |
| 1360 | if (!afinfo) |
| 1361 | return -EINVAL; |
| 1362 | |
| 1363 | err = afinfo->init_path(path, dst, nfheader_len); |
| 1364 | |
| 1365 | xfrm_policy_put_afinfo(afinfo); |
| 1366 | |
| 1367 | return err; |
| 1368 | } |
| 1369 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1370 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
| 1371 | { |
| 1372 | struct xfrm_policy_afinfo *afinfo = |
| 1373 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); |
| 1374 | int err; |
| 1375 | |
| 1376 | if (!afinfo) |
| 1377 | return -EINVAL; |
| 1378 | |
| 1379 | err = afinfo->fill_dst(xdst, dev); |
| 1380 | |
| 1381 | xfrm_policy_put_afinfo(afinfo); |
| 1382 | |
| 1383 | return err; |
| 1384 | } |
| 1385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
| 1387 | * all the metrics... Shortly, bundle a bundle. |
| 1388 | */ |
| 1389 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1390 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, |
| 1391 | struct xfrm_state **xfrm, int nx, |
| 1392 | struct flowi *fl, |
| 1393 | struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | { |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1395 | unsigned long now = jiffies; |
| 1396 | struct net_device *dev; |
| 1397 | struct dst_entry *dst_prev = NULL; |
| 1398 | struct dst_entry *dst0 = NULL; |
| 1399 | int i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | int err; |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1401 | int header_len = 0; |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1402 | int nfheader_len = 0; |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1403 | int trailer_len = 0; |
| 1404 | int tos; |
| 1405 | int family = policy->selector.family; |
YOSHIFUJI Hideaki | 9bb182a | 2008-02-22 14:48:22 +0900 | [diff] [blame] | 1406 | xfrm_address_t saddr, daddr; |
| 1407 | |
| 1408 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1409 | |
| 1410 | tos = xfrm_get_tos(fl, family); |
| 1411 | err = tos; |
| 1412 | if (tos < 0) |
| 1413 | goto put_states; |
| 1414 | |
| 1415 | dst_hold(dst); |
| 1416 | |
| 1417 | for (; i < nx; i++) { |
| 1418 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); |
| 1419 | struct dst_entry *dst1 = &xdst->u.dst; |
| 1420 | |
| 1421 | err = PTR_ERR(xdst); |
| 1422 | if (IS_ERR(xdst)) { |
| 1423 | dst_release(dst); |
| 1424 | goto put_states; |
| 1425 | } |
| 1426 | |
| 1427 | if (!dst_prev) |
| 1428 | dst0 = dst1; |
| 1429 | else { |
| 1430 | dst_prev->child = dst_clone(dst1); |
| 1431 | dst1->flags |= DST_NOHASH; |
| 1432 | } |
| 1433 | |
| 1434 | xdst->route = dst; |
| 1435 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); |
| 1436 | |
| 1437 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1438 | family = xfrm[i]->props.family; |
YOSHIFUJI Hideaki | 9bb182a | 2008-02-22 14:48:22 +0900 | [diff] [blame] | 1439 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
| 1440 | family); |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1441 | err = PTR_ERR(dst); |
| 1442 | if (IS_ERR(dst)) |
| 1443 | goto put_states; |
| 1444 | } else |
| 1445 | dst_hold(dst); |
| 1446 | |
| 1447 | dst1->xfrm = xfrm[i]; |
| 1448 | xdst->genid = xfrm[i]->genid; |
| 1449 | |
| 1450 | dst1->obsolete = -1; |
| 1451 | dst1->flags |= DST_HOST; |
| 1452 | dst1->lastuse = now; |
| 1453 | |
| 1454 | dst1->input = dst_discard; |
| 1455 | dst1->output = xfrm[i]->outer_mode->afinfo->output; |
| 1456 | |
| 1457 | dst1->next = dst_prev; |
| 1458 | dst_prev = dst1; |
| 1459 | |
| 1460 | header_len += xfrm[i]->props.header_len; |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1461 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
| 1462 | nfheader_len += xfrm[i]->props.header_len; |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1463 | trailer_len += xfrm[i]->props.trailer_len; |
| 1464 | } |
| 1465 | |
| 1466 | dst_prev->child = dst; |
| 1467 | dst0->path = dst; |
| 1468 | |
| 1469 | err = -ENODEV; |
| 1470 | dev = dst->dev; |
| 1471 | if (!dev) |
| 1472 | goto free_dst; |
| 1473 | |
| 1474 | /* Copy neighbout for reachability confirmation */ |
| 1475 | dst0->neighbour = neigh_clone(dst->neighbour); |
| 1476 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1477 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1478 | xfrm_init_pmtu(dst_prev); |
| 1479 | |
| 1480 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { |
| 1481 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; |
| 1482 | |
| 1483 | err = xfrm_fill_dst(xdst, dev); |
| 1484 | if (err) |
| 1485 | goto free_dst; |
| 1486 | |
| 1487 | dst_prev->header_len = header_len; |
| 1488 | dst_prev->trailer_len = trailer_len; |
| 1489 | header_len -= xdst->u.dst.xfrm->props.header_len; |
| 1490 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; |
| 1491 | } |
| 1492 | |
| 1493 | out: |
| 1494 | return dst0; |
| 1495 | |
| 1496 | put_states: |
| 1497 | for (; i < nx; i++) |
| 1498 | xfrm_state_put(xfrm[i]); |
| 1499 | free_dst: |
| 1500 | if (dst0) |
| 1501 | dst_free(dst0); |
| 1502 | dst0 = ERR_PTR(err); |
| 1503 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | } |
| 1505 | |
Masahide NAKAMURA | 157bfc2 | 2007-04-30 00:33:35 -0700 | [diff] [blame] | 1506 | static int inline |
| 1507 | xfrm_dst_alloc_copy(void **target, void *src, int size) |
| 1508 | { |
| 1509 | if (!*target) { |
| 1510 | *target = kmalloc(size, GFP_ATOMIC); |
| 1511 | if (!*target) |
| 1512 | return -ENOMEM; |
| 1513 | } |
| 1514 | memcpy(*target, src, size); |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | static int inline |
| 1519 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) |
| 1520 | { |
| 1521 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1522 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1523 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), |
| 1524 | sel, sizeof(*sel)); |
| 1525 | #else |
| 1526 | return 0; |
| 1527 | #endif |
| 1528 | } |
| 1529 | |
| 1530 | static int inline |
| 1531 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) |
| 1532 | { |
| 1533 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1534 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1535 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); |
| 1536 | #else |
| 1537 | return 0; |
| 1538 | #endif |
| 1539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | |
| 1541 | static int stale_bundle(struct dst_entry *dst); |
| 1542 | |
| 1543 | /* Main function: finds/creates a bundle for given flow. |
| 1544 | * |
| 1545 | * At the moment we eat a raw IP route. Mostly to speed up lookups |
| 1546 | * on interfaces with disabled IPsec. |
| 1547 | */ |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1548 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
| 1549 | struct sock *sk, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | { |
| 1551 | struct xfrm_policy *policy; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1552 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1553 | int npols; |
| 1554 | int pol_dead; |
| 1555 | int xfrm_nr; |
| 1556 | int pi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
| 1558 | struct dst_entry *dst, *dst_orig = *dst_p; |
| 1559 | int nx = 0; |
| 1560 | int err; |
| 1561 | u32 genid; |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1562 | u16 family; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1563 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | restart: |
| 1566 | genid = atomic_read(&flow_cache_genid); |
| 1567 | policy = NULL; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1568 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
| 1569 | pols[pi] = NULL; |
| 1570 | npols = 0; |
| 1571 | pol_dead = 0; |
| 1572 | xfrm_nr = 0; |
| 1573 | |
Thomas Graf | f7944fb | 2007-08-25 13:46:55 -0700 | [diff] [blame] | 1574 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1575 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
Herbert Xu | 75b8c13 | 2007-12-11 04:38:08 -0800 | [diff] [blame] | 1576 | err = PTR_ERR(policy); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1577 | if (IS_ERR(policy)) { |
| 1578 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
Herbert Xu | 75b8c13 | 2007-12-11 04:38:08 -0800 | [diff] [blame] | 1579 | goto dropdst; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1580 | } |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | |
| 1583 | if (!policy) { |
| 1584 | /* To accelerate a bit... */ |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1585 | if ((dst_orig->flags & DST_NOXFRM) || |
| 1586 | !xfrm_policy_count[XFRM_POLICY_OUT]) |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1587 | goto nopol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1589 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1590 | dir, xfrm_policy_lookup); |
Herbert Xu | 75b8c13 | 2007-12-11 04:38:08 -0800 | [diff] [blame] | 1591 | err = PTR_ERR(policy); |
Masahide NAKAMURA | d66e37a | 2008-01-07 21:46:15 -0800 | [diff] [blame] | 1592 | if (IS_ERR(policy)) { |
| 1593 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
Herbert Xu | 75b8c13 | 2007-12-11 04:38:08 -0800 | [diff] [blame] | 1594 | goto dropdst; |
Masahide NAKAMURA | d66e37a | 2008-01-07 21:46:15 -0800 | [diff] [blame] | 1595 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | } |
| 1597 | |
| 1598 | if (!policy) |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1599 | goto nopol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1601 | family = dst_orig->ops->family; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1602 | pols[0] = policy; |
| 1603 | npols ++; |
| 1604 | xfrm_nr += pols[0]->xfrm_nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | |
Herbert Xu | aef2178 | 2007-12-13 09:30:59 -0800 | [diff] [blame] | 1606 | err = -ENOENT; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1607 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
| 1608 | goto error; |
| 1609 | |
| 1610 | policy->curlft.use_time = get_seconds(); |
| 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | switch (policy->action) { |
Herbert Xu | 5e5234f | 2007-11-30 00:50:31 +1100 | [diff] [blame] | 1613 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | case XFRM_POLICY_BLOCK: |
| 1615 | /* Prohibit the flow */ |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1616 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 1617 | err = -EPERM; |
| 1618 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | |
| 1620 | case XFRM_POLICY_ALLOW: |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1621 | #ifndef CONFIG_XFRM_SUB_POLICY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | if (policy->xfrm_nr == 0) { |
| 1623 | /* Flow passes not transformed. */ |
| 1624 | xfrm_pol_put(policy); |
| 1625 | return 0; |
| 1626 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1627 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | |
| 1629 | /* Try to find matching bundle. |
| 1630 | * |
| 1631 | * LATER: help from flow cache. It is optional, this |
| 1632 | * is required only for output policy. |
| 1633 | */ |
| 1634 | dst = xfrm_find_bundle(fl, policy, family); |
| 1635 | if (IS_ERR(dst)) { |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1636 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 1637 | err = PTR_ERR(dst); |
| 1638 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | } |
| 1640 | |
| 1641 | if (dst) |
| 1642 | break; |
| 1643 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1644 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1645 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 1646 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, |
| 1647 | fl, family, |
| 1648 | XFRM_POLICY_OUT); |
| 1649 | if (pols[1]) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1650 | if (IS_ERR(pols[1])) { |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1651 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1652 | err = PTR_ERR(pols[1]); |
| 1653 | goto error; |
| 1654 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1655 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1656 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1657 | err = -EPERM; |
| 1658 | goto error; |
| 1659 | } |
| 1660 | npols ++; |
| 1661 | xfrm_nr += pols[1]->xfrm_nr; |
| 1662 | } |
| 1663 | } |
| 1664 | |
| 1665 | /* |
| 1666 | * Because neither flowi nor bundle information knows about |
| 1667 | * transformation template size. On more than one policy usage |
| 1668 | * we can realize whether all of them is bypass or not after |
| 1669 | * they are searched. See above not-transformed bypass |
| 1670 | * is surrounded by non-sub policy configuration, too. |
| 1671 | */ |
| 1672 | if (xfrm_nr == 0) { |
| 1673 | /* Flow passes not transformed. */ |
| 1674 | xfrm_pols_put(pols, npols); |
| 1675 | return 0; |
| 1676 | } |
| 1677 | |
| 1678 | #endif |
| 1679 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
| 1681 | if (unlikely(nx<0)) { |
| 1682 | err = nx; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1683 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
| 1684 | /* EREMOTE tells the caller to generate |
| 1685 | * a one-shot blackhole route. |
| 1686 | */ |
Masahide NAKAMURA | d66e37a | 2008-01-07 21:46:15 -0800 | [diff] [blame] | 1687 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1688 | xfrm_pol_put(policy); |
| 1689 | return -EREMOTE; |
| 1690 | } |
Herbert Xu | 815f4e5 | 2007-12-12 10:36:59 -0800 | [diff] [blame] | 1691 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | DECLARE_WAITQUEUE(wait, current); |
| 1693 | |
| 1694 | add_wait_queue(&km_waitq, &wait); |
| 1695 | set_current_state(TASK_INTERRUPTIBLE); |
| 1696 | schedule(); |
| 1697 | set_current_state(TASK_RUNNING); |
| 1698 | remove_wait_queue(&km_waitq, &wait); |
| 1699 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1700 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
| 1702 | if (nx == -EAGAIN && signal_pending(current)) { |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1703 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | err = -ERESTART; |
| 1705 | goto error; |
| 1706 | } |
| 1707 | if (nx == -EAGAIN || |
| 1708 | genid != atomic_read(&flow_cache_genid)) { |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1709 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | goto restart; |
| 1711 | } |
| 1712 | err = nx; |
| 1713 | } |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1714 | if (err < 0) { |
| 1715 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | goto error; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1717 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | } |
| 1719 | if (nx == 0) { |
| 1720 | /* Flow passes not transformed. */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1721 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | return 0; |
| 1723 | } |
| 1724 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 1725 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
| 1726 | err = PTR_ERR(dst); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1727 | if (IS_ERR(dst)) { |
| 1728 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | goto error; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1730 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1732 | for (pi = 0; pi < npols; pi++) { |
| 1733 | read_lock_bh(&pols[pi]->lock); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 1734 | pol_dead |= pols[pi]->walk.dead; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1735 | read_unlock_bh(&pols[pi]->lock); |
| 1736 | } |
| 1737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | write_lock_bh(&policy->lock); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1739 | if (unlikely(pol_dead || stale_bundle(dst))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | /* Wow! While we worked on resolving, this |
| 1741 | * policy has gone. Retry. It is not paranoia, |
| 1742 | * we just cannot enlist new bundle to dead object. |
| 1743 | * We can't enlist stable bundles either. |
| 1744 | */ |
| 1745 | write_unlock_bh(&policy->lock); |
Julien Brunel | 9d7d740 | 2008-09-02 17:24:28 -0700 | [diff] [blame] | 1746 | dst_free(dst); |
Herbert Xu | 00de651 | 2006-02-13 16:01:27 -0800 | [diff] [blame] | 1747 | |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1748 | if (pol_dead) |
| 1749 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); |
| 1750 | else |
| 1751 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
Herbert Xu | 00de651 | 2006-02-13 16:01:27 -0800 | [diff] [blame] | 1752 | err = -EHOSTUNREACH; |
| 1753 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | } |
Masahide NAKAMURA | 157bfc2 | 2007-04-30 00:33:35 -0700 | [diff] [blame] | 1755 | |
| 1756 | if (npols > 1) |
| 1757 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); |
| 1758 | else |
| 1759 | err = xfrm_dst_update_origin(dst, fl); |
| 1760 | if (unlikely(err)) { |
| 1761 | write_unlock_bh(&policy->lock); |
Julien Brunel | 9d7d740 | 2008-09-02 17:24:28 -0700 | [diff] [blame] | 1762 | dst_free(dst); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1763 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
Masahide NAKAMURA | 157bfc2 | 2007-04-30 00:33:35 -0700 | [diff] [blame] | 1764 | goto error; |
| 1765 | } |
| 1766 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | dst->next = policy->bundles; |
| 1768 | policy->bundles = dst; |
| 1769 | dst_hold(dst); |
| 1770 | write_unlock_bh(&policy->lock); |
| 1771 | } |
| 1772 | *dst_p = dst; |
| 1773 | dst_release(dst_orig); |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1774 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | return 0; |
| 1776 | |
| 1777 | error: |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1778 | xfrm_pols_put(pols, npols); |
Herbert Xu | 75b8c13 | 2007-12-11 04:38:08 -0800 | [diff] [blame] | 1779 | dropdst: |
| 1780 | dst_release(dst_orig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | *dst_p = NULL; |
| 1782 | return err; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1783 | |
| 1784 | nopol: |
Herbert Xu | aef2178 | 2007-12-13 09:30:59 -0800 | [diff] [blame] | 1785 | err = -ENOENT; |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 1786 | if (flags & XFRM_LOOKUP_ICMP) |
| 1787 | goto dropdst; |
| 1788 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | } |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1790 | EXPORT_SYMBOL(__xfrm_lookup); |
| 1791 | |
| 1792 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
| 1793 | struct sock *sk, int flags) |
| 1794 | { |
| 1795 | int err = __xfrm_lookup(dst_p, fl, sk, flags); |
| 1796 | |
| 1797 | if (err == -EREMOTE) { |
| 1798 | dst_release(*dst_p); |
| 1799 | *dst_p = NULL; |
| 1800 | err = -EAGAIN; |
| 1801 | } |
| 1802 | |
| 1803 | return err; |
| 1804 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | EXPORT_SYMBOL(xfrm_lookup); |
| 1806 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1807 | static inline int |
| 1808 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) |
| 1809 | { |
| 1810 | struct xfrm_state *x; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1811 | |
| 1812 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) |
| 1813 | return 0; |
| 1814 | x = skb->sp->xvec[idx]; |
| 1815 | if (!x->type->reject) |
| 1816 | return 0; |
Herbert Xu | 1ecafed | 2007-10-09 13:24:07 -0700 | [diff] [blame] | 1817 | return x->type->reject(x, skb, fl); |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1818 | } |
| 1819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | /* When skb is transformed back to its "native" form, we have to |
| 1821 | * check policy restrictions. At the moment we make this in maximally |
| 1822 | * stupid way. Shame on me. :-) Of course, connected sockets must |
| 1823 | * have policy cached at them. |
| 1824 | */ |
| 1825 | |
| 1826 | static inline int |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1827 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | unsigned short family) |
| 1829 | { |
| 1830 | if (xfrm_state_kern(x)) |
Kazunori MIYAZAWA | 928ba41 | 2007-02-13 12:57:16 -0800 | [diff] [blame] | 1831 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | return x->id.proto == tmpl->id.proto && |
| 1833 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && |
| 1834 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && |
| 1835 | x->props.mode == tmpl->mode && |
Herbert Xu | c5d18e9 | 2008-04-22 00:46:42 -0700 | [diff] [blame] | 1836 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
Masahide NAKAMURA | f3bd484 | 2006-08-23 18:00:48 -0700 | [diff] [blame] | 1837 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 1838 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
| 1839 | xfrm_state_addr_cmp(tmpl, x, family)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | } |
| 1841 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1842 | /* |
| 1843 | * 0 or more than 0 is returned when validation is succeeded (either bypass |
| 1844 | * because of optional transport mode, or next index of the mathced secpath |
| 1845 | * state with the template. |
| 1846 | * -1 is returned when no matching template is found. |
| 1847 | * Otherwise "-2 - errored_index" is returned. |
| 1848 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | static inline int |
| 1850 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, |
| 1851 | unsigned short family) |
| 1852 | { |
| 1853 | int idx = start; |
| 1854 | |
| 1855 | if (tmpl->optional) { |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 1856 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | return start; |
| 1858 | } else |
| 1859 | start = -1; |
| 1860 | for (; idx < sp->len; idx++) { |
Herbert Xu | dbe5b4a | 2006-04-01 00:54:16 -0800 | [diff] [blame] | 1861 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | return ++idx; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1863 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1864 | if (start == -1) |
| 1865 | start = -2-idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | break; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1867 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | } |
| 1869 | return start; |
| 1870 | } |
| 1871 | |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1872 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
| 1873 | unsigned int family, int reverse) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | { |
| 1875 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1876 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | |
| 1878 | if (unlikely(afinfo == NULL)) |
| 1879 | return -EAFNOSUPPORT; |
| 1880 | |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1881 | afinfo->decode_session(skb, fl, reverse); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1882 | err = security_xfrm_decode_session(skb, &fl->secid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | xfrm_policy_put_afinfo(afinfo); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1884 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | } |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1886 | EXPORT_SYMBOL(__xfrm_decode_session); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1888 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | { |
| 1890 | for (; k < sp->len; k++) { |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1891 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1892 | *idxp = k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | return 1; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | } |
| 1896 | |
| 1897 | return 0; |
| 1898 | } |
| 1899 | |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1900 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | unsigned short family) |
| 1902 | { |
| 1903 | struct xfrm_policy *pol; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1904 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1905 | int npols = 0; |
| 1906 | int xfrm_nr; |
| 1907 | int pi; |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1908 | int reverse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | struct flowi fl; |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1910 | u8 fl_dir; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1911 | int xerr_idx = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 1913 | reverse = dir & ~XFRM_POLICY_MASK; |
| 1914 | dir &= XFRM_POLICY_MASK; |
| 1915 | fl_dir = policy_to_flow_dir(dir); |
| 1916 | |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1917 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
| 1918 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1920 | } |
| 1921 | |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 1922 | nf_nat_decode_session(skb, &fl, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | |
| 1924 | /* First, check used SA against their selectors. */ |
| 1925 | if (skb->sp) { |
| 1926 | int i; |
| 1927 | |
| 1928 | for (i=skb->sp->len-1; i>=0; i--) { |
Herbert Xu | dbe5b4a | 2006-04-01 00:54:16 -0800 | [diff] [blame] | 1929 | struct xfrm_state *x = skb->sp->xvec[i]; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1930 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
| 1931 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | } |
| 1935 | } |
| 1936 | |
| 1937 | pol = NULL; |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1938 | if (sk && sk->sk_policy[dir]) { |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1939 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1940 | if (IS_ERR(pol)) { |
| 1941 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1942 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1943 | } |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | |
| 1946 | if (!pol) |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1947 | pol = flow_cache_lookup(&fl, family, fl_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | xfrm_policy_lookup); |
| 1949 | |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1950 | if (IS_ERR(pol)) { |
| 1951 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1952 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1953 | } |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1954 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1955 | if (!pol) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1956 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1957 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1958 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1959 | return 0; |
| 1960 | } |
| 1961 | return 1; |
| 1962 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1964 | pol->curlft.use_time = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1966 | pols[0] = pol; |
| 1967 | npols ++; |
| 1968 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1969 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 1970 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, |
| 1971 | &fl, family, |
| 1972 | XFRM_POLICY_IN); |
| 1973 | if (pols[1]) { |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1974 | if (IS_ERR(pols[1])) { |
| 1975 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1976 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1977 | } |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 1978 | pols[1]->curlft.use_time = get_seconds(); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1979 | npols ++; |
| 1980 | } |
| 1981 | } |
| 1982 | #endif |
| 1983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | if (pol->action == XFRM_POLICY_ALLOW) { |
| 1985 | struct sec_path *sp; |
| 1986 | static struct sec_path dummy; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1987 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1988 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1989 | struct xfrm_tmpl **tpp = tp; |
| 1990 | int ti = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | int i, k; |
| 1992 | |
| 1993 | if ((sp = skb->sp) == NULL) |
| 1994 | sp = &dummy; |
| 1995 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1996 | for (pi = 0; pi < npols; pi++) { |
| 1997 | if (pols[pi] != pol && |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 1998 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
| 1999 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2000 | goto reject; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2001 | } |
| 2002 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { |
| 2003 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2004 | goto reject_error; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2005 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2006 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
| 2007 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; |
| 2008 | } |
| 2009 | xfrm_nr = ti; |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 2010 | if (npols > 1) { |
| 2011 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); |
| 2012 | tpp = stp; |
| 2013 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | /* For each tunnel xfrm, find the first matching tmpl. |
| 2016 | * For each tmpl before that, find corresponding xfrm. |
| 2017 | * Order is _important_. Later we will implement |
| 2018 | * some barriers, but at the moment barriers |
| 2019 | * are implied between each two transformations. |
| 2020 | */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2021 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
| 2022 | k = xfrm_policy_ok(tpp[i], sp, k, family); |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 2023 | if (k < 0) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 2024 | if (k < -1) |
| 2025 | /* "-2 - errored_index" returned */ |
| 2026 | xerr_idx = -(2+k); |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2027 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | goto reject; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 2029 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | } |
| 2031 | |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2032 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
| 2033 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | goto reject; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2035 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2037 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | return 1; |
| 2039 | } |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2040 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | |
| 2042 | reject: |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 2043 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2044 | reject_error: |
| 2045 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | return 0; |
| 2047 | } |
| 2048 | EXPORT_SYMBOL(__xfrm_policy_check); |
| 2049 | |
| 2050 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) |
| 2051 | { |
| 2052 | struct flowi fl; |
| 2053 | |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2054 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
| 2055 | /* XXX: we should have something like FWDHDRERROR here. */ |
| 2056 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | return 0; |
Masahide NAKAMURA | 0aa6477 | 2007-12-20 20:43:36 -0800 | [diff] [blame] | 2058 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
| 2060 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; |
| 2061 | } |
| 2062 | EXPORT_SYMBOL(__xfrm_route_forward); |
| 2063 | |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 2064 | /* Optimize later using cookies and generation ids. */ |
| 2065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
| 2067 | { |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 2068 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
| 2069 | * to "-1" to force all XFRM destinations to get validated by |
| 2070 | * dst_ops->check on every use. We do this because when a |
| 2071 | * normal route referenced by an XFRM dst is obsoleted we do |
| 2072 | * not go looking around for all parent referencing XFRM dsts |
| 2073 | * so that we can invalidate them. It is just too much work. |
| 2074 | * Instead we make the checks here on every use. For example: |
| 2075 | * |
| 2076 | * XFRM dst A --> IPv4 dst X |
| 2077 | * |
| 2078 | * X is the "xdst->route" of A (X is also the "dst->path" of A |
| 2079 | * in this example). If X is marked obsolete, "A" will not |
| 2080 | * notice. That's what we are validating here via the |
| 2081 | * stale_bundle() check. |
| 2082 | * |
| 2083 | * When a policy's bundle is pruned, we dst_free() the XFRM |
| 2084 | * dst which causes it's ->obsolete field to be set to a |
| 2085 | * positive non-zero integer. If an XFRM dst has been pruned |
| 2086 | * like this, we want to force a new route lookup. |
David S. Miller | 399c180 | 2005-12-19 14:23:23 -0800 | [diff] [blame] | 2087 | */ |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 2088 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
| 2089 | return dst; |
| 2090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | return NULL; |
| 2092 | } |
| 2093 | |
| 2094 | static int stale_bundle(struct dst_entry *dst) |
| 2095 | { |
Venkat Yekkirala | 5b368e6 | 2006-10-05 15:42:18 -0500 | [diff] [blame] | 2096 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | } |
| 2098 | |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 2099 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2102 | dst->dev = dev_net(dev)->loopback_dev; |
Daniel Lezcano | de3cb74 | 2007-09-25 19:16:28 -0700 | [diff] [blame] | 2103 | dev_hold(dst->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | dev_put(dev); |
| 2105 | } |
| 2106 | } |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 2107 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | |
| 2109 | static void xfrm_link_failure(struct sk_buff *skb) |
| 2110 | { |
| 2111 | /* Impossible. Such dst must be popped before reaches point of failure. */ |
| 2112 | return; |
| 2113 | } |
| 2114 | |
| 2115 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) |
| 2116 | { |
| 2117 | if (dst) { |
| 2118 | if (dst->obsolete) { |
| 2119 | dst_release(dst); |
| 2120 | dst = NULL; |
| 2121 | } |
| 2122 | } |
| 2123 | return dst; |
| 2124 | } |
| 2125 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2126 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
| 2127 | { |
| 2128 | struct dst_entry *dst, **dstp; |
| 2129 | |
| 2130 | write_lock(&pol->lock); |
| 2131 | dstp = &pol->bundles; |
| 2132 | while ((dst=*dstp) != NULL) { |
| 2133 | if (func(dst)) { |
| 2134 | *dstp = dst->next; |
| 2135 | dst->next = *gc_list_p; |
| 2136 | *gc_list_p = dst; |
| 2137 | } else { |
| 2138 | dstp = &dst->next; |
| 2139 | } |
| 2140 | } |
| 2141 | write_unlock(&pol->lock); |
| 2142 | } |
| 2143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
| 2145 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2146 | struct dst_entry *gc_list = NULL; |
| 2147 | int dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | |
| 2149 | read_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2150 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 2151 | struct xfrm_policy *pol; |
| 2152 | struct hlist_node *entry; |
| 2153 | struct hlist_head *table; |
| 2154 | int i; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 2155 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2156 | hlist_for_each_entry(pol, entry, |
| 2157 | &xfrm_policy_inexact[dir], bydst) |
| 2158 | prune_one_bundle(pol, func, &gc_list); |
| 2159 | |
| 2160 | table = xfrm_policy_bydst[dir].table; |
| 2161 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 2162 | hlist_for_each_entry(pol, entry, table + i, bydst) |
| 2163 | prune_one_bundle(pol, func, &gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | } |
| 2165 | } |
| 2166 | read_unlock_bh(&xfrm_policy_lock); |
| 2167 | |
| 2168 | while (gc_list) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2169 | struct dst_entry *dst = gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | gc_list = dst->next; |
| 2171 | dst_free(dst); |
| 2172 | } |
| 2173 | } |
| 2174 | |
| 2175 | static int unused_bundle(struct dst_entry *dst) |
| 2176 | { |
| 2177 | return !atomic_read(&dst->__refcnt); |
| 2178 | } |
| 2179 | |
| 2180 | static void __xfrm_garbage_collect(void) |
| 2181 | { |
| 2182 | xfrm_prune_bundles(unused_bundle); |
| 2183 | } |
| 2184 | |
David S. Miller | 1c09539 | 2006-08-24 03:30:28 -0700 | [diff] [blame] | 2185 | static int xfrm_flush_bundles(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | { |
| 2187 | xfrm_prune_bundles(stale_bundle); |
| 2188 | return 0; |
| 2189 | } |
| 2190 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 2191 | static void xfrm_init_pmtu(struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | { |
| 2193 | do { |
| 2194 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 2195 | u32 pmtu, route_mtu_cached; |
| 2196 | |
| 2197 | pmtu = dst_mtu(dst->child); |
| 2198 | xdst->child_mtu_cached = pmtu; |
| 2199 | |
| 2200 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); |
| 2201 | |
| 2202 | route_mtu_cached = dst_mtu(xdst->route); |
| 2203 | xdst->route_mtu_cached = route_mtu_cached; |
| 2204 | |
| 2205 | if (pmtu > route_mtu_cached) |
| 2206 | pmtu = route_mtu_cached; |
| 2207 | |
| 2208 | dst->metrics[RTAX_MTU-1] = pmtu; |
| 2209 | } while ((dst = dst->next)); |
| 2210 | } |
| 2211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | /* Check that the bundle accepts the flow and its components are |
| 2213 | * still valid. |
| 2214 | */ |
| 2215 | |
Venkat Yekkirala | 5b368e6 | 2006-10-05 15:42:18 -0500 | [diff] [blame] | 2216 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
| 2217 | struct flowi *fl, int family, int strict) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | { |
| 2219 | struct dst_entry *dst = &first->u.dst; |
| 2220 | struct xfrm_dst *last; |
| 2221 | u32 mtu; |
| 2222 | |
Hideaki YOSHIFUJI | 92d63de | 2005-05-26 12:58:04 -0700 | [diff] [blame] | 2223 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | (dst->dev && !netif_running(dst->dev))) |
| 2225 | return 0; |
Masahide NAKAMURA | 157bfc2 | 2007-04-30 00:33:35 -0700 | [diff] [blame] | 2226 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 2227 | if (fl) { |
| 2228 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) |
| 2229 | return 0; |
| 2230 | if (first->partner && |
| 2231 | !xfrm_selector_match(first->partner, fl, family)) |
| 2232 | return 0; |
| 2233 | } |
| 2234 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | |
| 2236 | last = NULL; |
| 2237 | |
| 2238 | do { |
| 2239 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 2240 | |
| 2241 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) |
| 2242 | return 0; |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 2243 | if (fl && pol && |
| 2244 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 2245 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
| 2247 | return 0; |
David S. Miller | 9d4a706 | 2006-08-24 03:18:09 -0700 | [diff] [blame] | 2248 | if (xdst->genid != dst->xfrm->genid) |
| 2249 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | |
Herbert Xu | 1bfcb10 | 2007-10-17 21:31:50 -0700 | [diff] [blame] | 2251 | if (strict && fl && |
Herbert Xu | 1399637 | 2007-10-17 21:35:51 -0700 | [diff] [blame] | 2252 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
Masahide NAKAMURA | e53820d | 2006-08-23 19:12:01 -0700 | [diff] [blame] | 2253 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
| 2254 | return 0; |
| 2255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | mtu = dst_mtu(dst->child); |
| 2257 | if (xdst->child_mtu_cached != mtu) { |
| 2258 | last = xdst; |
| 2259 | xdst->child_mtu_cached = mtu; |
| 2260 | } |
| 2261 | |
Hideaki YOSHIFUJI | 92d63de | 2005-05-26 12:58:04 -0700 | [diff] [blame] | 2262 | if (!dst_check(xdst->route, xdst->route_cookie)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | return 0; |
| 2264 | mtu = dst_mtu(xdst->route); |
| 2265 | if (xdst->route_mtu_cached != mtu) { |
| 2266 | last = xdst; |
| 2267 | xdst->route_mtu_cached = mtu; |
| 2268 | } |
| 2269 | |
| 2270 | dst = dst->child; |
| 2271 | } while (dst->xfrm); |
| 2272 | |
| 2273 | if (likely(!last)) |
| 2274 | return 1; |
| 2275 | |
| 2276 | mtu = last->child_mtu_cached; |
| 2277 | for (;;) { |
| 2278 | dst = &last->u.dst; |
| 2279 | |
| 2280 | mtu = xfrm_state_mtu(dst->xfrm, mtu); |
| 2281 | if (mtu > last->route_mtu_cached) |
| 2282 | mtu = last->route_mtu_cached; |
| 2283 | dst->metrics[RTAX_MTU-1] = mtu; |
| 2284 | |
| 2285 | if (last == first) |
| 2286 | break; |
| 2287 | |
Patrick McHardy | bd0bf07 | 2007-07-18 01:55:52 -0700 | [diff] [blame] | 2288 | last = (struct xfrm_dst *)last->u.dst.next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | last->child_mtu_cached = mtu; |
| 2290 | } |
| 2291 | |
| 2292 | return 1; |
| 2293 | } |
| 2294 | |
| 2295 | EXPORT_SYMBOL(xfrm_bundle_ok); |
| 2296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2298 | { |
| 2299 | int err = 0; |
| 2300 | if (unlikely(afinfo == NULL)) |
| 2301 | return -EINVAL; |
| 2302 | if (unlikely(afinfo->family >= NPROTO)) |
| 2303 | return -EAFNOSUPPORT; |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2304 | write_lock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
| 2306 | err = -ENOBUFS; |
| 2307 | else { |
| 2308 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2309 | if (likely(dst_ops->kmem_cachep == NULL)) |
| 2310 | dst_ops->kmem_cachep = xfrm_dst_cache; |
| 2311 | if (likely(dst_ops->check == NULL)) |
| 2312 | dst_ops->check = xfrm_dst_check; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | if (likely(dst_ops->negative_advice == NULL)) |
| 2314 | dst_ops->negative_advice = xfrm_negative_advice; |
| 2315 | if (likely(dst_ops->link_failure == NULL)) |
| 2316 | dst_ops->link_failure = xfrm_link_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | if (likely(afinfo->garbage_collect == NULL)) |
| 2318 | afinfo->garbage_collect = __xfrm_garbage_collect; |
| 2319 | xfrm_policy_afinfo[afinfo->family] = afinfo; |
| 2320 | } |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2321 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | return err; |
| 2323 | } |
| 2324 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); |
| 2325 | |
| 2326 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2327 | { |
| 2328 | int err = 0; |
| 2329 | if (unlikely(afinfo == NULL)) |
| 2330 | return -EINVAL; |
| 2331 | if (unlikely(afinfo->family >= NPROTO)) |
| 2332 | return -EAFNOSUPPORT; |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2333 | write_lock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
| 2335 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) |
| 2336 | err = -EINVAL; |
| 2337 | else { |
| 2338 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2339 | xfrm_policy_afinfo[afinfo->family] = NULL; |
| 2340 | dst_ops->kmem_cachep = NULL; |
| 2341 | dst_ops->check = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | dst_ops->negative_advice = NULL; |
| 2343 | dst_ops->link_failure = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | afinfo->garbage_collect = NULL; |
| 2345 | } |
| 2346 | } |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2347 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | return err; |
| 2349 | } |
| 2350 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); |
| 2351 | |
| 2352 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
| 2353 | { |
| 2354 | struct xfrm_policy_afinfo *afinfo; |
| 2355 | if (unlikely(family >= NPROTO)) |
| 2356 | return NULL; |
| 2357 | read_lock(&xfrm_policy_afinfo_lock); |
| 2358 | afinfo = xfrm_policy_afinfo[family]; |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 2359 | if (unlikely(!afinfo)) |
| 2360 | read_unlock(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | return afinfo; |
| 2362 | } |
| 2363 | |
| 2364 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2365 | { |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 2366 | read_unlock(&xfrm_policy_afinfo_lock); |
| 2367 | } |
| 2368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 2370 | { |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 2371 | struct net_device *dev = ptr; |
| 2372 | |
YOSHIFUJI Hideaki | 721499e | 2008-07-19 22:34:43 -0700 | [diff] [blame] | 2373 | if (!net_eq(dev_net(dev), &init_net)) |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 2374 | return NOTIFY_DONE; |
| 2375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | switch (event) { |
| 2377 | case NETDEV_DOWN: |
| 2378 | xfrm_flush_bundles(); |
| 2379 | } |
| 2380 | return NOTIFY_DONE; |
| 2381 | } |
| 2382 | |
| 2383 | static struct notifier_block xfrm_dev_notifier = { |
| 2384 | xfrm_dev_event, |
| 2385 | NULL, |
| 2386 | 0 |
| 2387 | }; |
| 2388 | |
Masahide NAKAMURA | 558f82e | 2007-12-20 20:42:57 -0800 | [diff] [blame] | 2389 | #ifdef CONFIG_XFRM_STATISTICS |
| 2390 | static int __init xfrm_statistics_init(void) |
| 2391 | { |
| 2392 | if (snmp_mib_init((void **)xfrm_statistics, |
| 2393 | sizeof(struct linux_xfrm_mib)) < 0) |
| 2394 | return -ENOMEM; |
| 2395 | return 0; |
| 2396 | } |
| 2397 | #endif |
| 2398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | static void __init xfrm_policy_init(void) |
| 2400 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2401 | unsigned int hmask, sz; |
| 2402 | int dir; |
| 2403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
| 2405 | sizeof(struct xfrm_dst), |
Alexey Dobriyan | e5d679f | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 2406 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2407 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2409 | hmask = 8 - 1; |
| 2410 | sz = (hmask+1) * sizeof(struct hlist_head); |
| 2411 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 2412 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2413 | xfrm_idx_hmask = hmask; |
| 2414 | if (!xfrm_policy_byidx) |
| 2415 | panic("XFRM: failed to allocate byidx hash\n"); |
| 2416 | |
| 2417 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 2418 | struct xfrm_policy_hash *htab; |
| 2419 | |
| 2420 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); |
| 2421 | |
| 2422 | htab = &xfrm_policy_bydst[dir]; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 2423 | htab->table = xfrm_hash_alloc(sz); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2424 | htab->hmask = hmask; |
| 2425 | if (!htab->table) |
| 2426 | panic("XFRM: failed to allocate bydst hash\n"); |
| 2427 | } |
| 2428 | |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 2429 | INIT_LIST_HEAD(&xfrm_policy_all); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2430 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | register_netdevice_notifier(&xfrm_dev_notifier); |
| 2432 | } |
| 2433 | |
| 2434 | void __init xfrm_init(void) |
| 2435 | { |
Masahide NAKAMURA | 558f82e | 2007-12-20 20:42:57 -0800 | [diff] [blame] | 2436 | #ifdef CONFIG_XFRM_STATISTICS |
| 2437 | xfrm_statistics_init(); |
| 2438 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | xfrm_state_init(); |
| 2440 | xfrm_policy_init(); |
| 2441 | xfrm_input_init(); |
Masahide NAKAMURA | 558f82e | 2007-12-20 20:42:57 -0800 | [diff] [blame] | 2442 | #ifdef CONFIG_XFRM_STATISTICS |
| 2443 | xfrm_proc_init(); |
| 2444 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | } |
| 2446 | |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2447 | #ifdef CONFIG_AUDITSYSCALL |
Ilpo Järvinen | 1486cbd | 2008-01-12 03:20:03 -0800 | [diff] [blame] | 2448 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
| 2449 | struct audit_buffer *audit_buf) |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2450 | { |
Paul Moore | 875179f | 2007-12-01 23:27:18 +1100 | [diff] [blame] | 2451 | struct xfrm_sec_ctx *ctx = xp->security; |
| 2452 | struct xfrm_selector *sel = &xp->selector; |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2453 | |
Paul Moore | 875179f | 2007-12-01 23:27:18 +1100 | [diff] [blame] | 2454 | if (ctx) |
| 2455 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
| 2456 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
| 2457 | |
| 2458 | switch(sel->family) { |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2459 | case AF_INET: |
Paul Moore | 875179f | 2007-12-01 23:27:18 +1100 | [diff] [blame] | 2460 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
| 2461 | NIPQUAD(sel->saddr.a4)); |
| 2462 | if (sel->prefixlen_s != 32) |
| 2463 | audit_log_format(audit_buf, " src_prefixlen=%d", |
| 2464 | sel->prefixlen_s); |
| 2465 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, |
| 2466 | NIPQUAD(sel->daddr.a4)); |
| 2467 | if (sel->prefixlen_d != 32) |
| 2468 | audit_log_format(audit_buf, " dst_prefixlen=%d", |
| 2469 | sel->prefixlen_d); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2470 | break; |
| 2471 | case AF_INET6: |
Paul Moore | 875179f | 2007-12-01 23:27:18 +1100 | [diff] [blame] | 2472 | audit_log_format(audit_buf, " src=" NIP6_FMT, |
| 2473 | NIP6(*(struct in6_addr *)sel->saddr.a6)); |
| 2474 | if (sel->prefixlen_s != 128) |
| 2475 | audit_log_format(audit_buf, " src_prefixlen=%d", |
| 2476 | sel->prefixlen_s); |
| 2477 | audit_log_format(audit_buf, " dst=" NIP6_FMT, |
| 2478 | NIP6(*(struct in6_addr *)sel->daddr.a6)); |
| 2479 | if (sel->prefixlen_d != 128) |
| 2480 | audit_log_format(audit_buf, " dst_prefixlen=%d", |
| 2481 | sel->prefixlen_d); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2482 | break; |
| 2483 | } |
| 2484 | } |
| 2485 | |
Paul Moore | 68277ac | 2007-12-20 20:49:33 -0800 | [diff] [blame] | 2486 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 2487 | uid_t auid, u32 sessionid, u32 secid) |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2488 | { |
| 2489 | struct audit_buffer *audit_buf; |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2490 | |
Paul Moore | afeb14b | 2007-12-21 14:58:11 -0800 | [diff] [blame] | 2491 | audit_buf = xfrm_audit_start("SPD-add"); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2492 | if (audit_buf == NULL) |
| 2493 | return; |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 2494 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
Paul Moore | afeb14b | 2007-12-21 14:58:11 -0800 | [diff] [blame] | 2495 | audit_log_format(audit_buf, " res=%u", result); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2496 | xfrm_audit_common_policyinfo(xp, audit_buf); |
| 2497 | audit_log_end(audit_buf); |
| 2498 | } |
| 2499 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); |
| 2500 | |
Paul Moore | 68277ac | 2007-12-20 20:49:33 -0800 | [diff] [blame] | 2501 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 2502 | uid_t auid, u32 sessionid, u32 secid) |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2503 | { |
| 2504 | struct audit_buffer *audit_buf; |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2505 | |
Paul Moore | afeb14b | 2007-12-21 14:58:11 -0800 | [diff] [blame] | 2506 | audit_buf = xfrm_audit_start("SPD-delete"); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2507 | if (audit_buf == NULL) |
| 2508 | return; |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 2509 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
Paul Moore | afeb14b | 2007-12-21 14:58:11 -0800 | [diff] [blame] | 2510 | audit_log_format(audit_buf, " res=%u", result); |
Joy Latten | ab5f5e8 | 2007-09-17 11:51:22 -0700 | [diff] [blame] | 2511 | xfrm_audit_common_policyinfo(xp, audit_buf); |
| 2512 | audit_log_end(audit_buf); |
| 2513 | } |
| 2514 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); |
| 2515 | #endif |
| 2516 | |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2517 | #ifdef CONFIG_XFRM_MIGRATE |
| 2518 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, |
| 2519 | struct xfrm_selector *sel_tgt) |
| 2520 | { |
| 2521 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { |
| 2522 | if (sel_tgt->family == sel_cmp->family && |
| 2523 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 2524 | sel_cmp->family) == 0 && |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2525 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
| 2526 | sel_cmp->family) == 0 && |
| 2527 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
| 2528 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { |
| 2529 | return 1; |
| 2530 | } |
| 2531 | } else { |
| 2532 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { |
| 2533 | return 1; |
| 2534 | } |
| 2535 | } |
| 2536 | return 0; |
| 2537 | } |
| 2538 | |
| 2539 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, |
| 2540 | u8 dir, u8 type) |
| 2541 | { |
| 2542 | struct xfrm_policy *pol, *ret = NULL; |
| 2543 | struct hlist_node *entry; |
| 2544 | struct hlist_head *chain; |
| 2545 | u32 priority = ~0U; |
| 2546 | |
| 2547 | read_lock_bh(&xfrm_policy_lock); |
| 2548 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); |
| 2549 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2550 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2551 | pol->type == type) { |
| 2552 | ret = pol; |
| 2553 | priority = ret->priority; |
| 2554 | break; |
| 2555 | } |
| 2556 | } |
| 2557 | chain = &xfrm_policy_inexact[dir]; |
| 2558 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2559 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2560 | pol->type == type && |
| 2561 | pol->priority < priority) { |
| 2562 | ret = pol; |
| 2563 | break; |
| 2564 | } |
| 2565 | } |
| 2566 | |
| 2567 | if (ret) |
| 2568 | xfrm_pol_hold(ret); |
| 2569 | |
| 2570 | read_unlock_bh(&xfrm_policy_lock); |
| 2571 | |
| 2572 | return ret; |
| 2573 | } |
| 2574 | |
| 2575 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) |
| 2576 | { |
| 2577 | int match = 0; |
| 2578 | |
| 2579 | if (t->mode == m->mode && t->id.proto == m->proto && |
| 2580 | (m->reqid == 0 || t->reqid == m->reqid)) { |
| 2581 | switch (t->mode) { |
| 2582 | case XFRM_MODE_TUNNEL: |
| 2583 | case XFRM_MODE_BEET: |
| 2584 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, |
| 2585 | m->old_family) == 0 && |
| 2586 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, |
| 2587 | m->old_family) == 0) { |
| 2588 | match = 1; |
| 2589 | } |
| 2590 | break; |
| 2591 | case XFRM_MODE_TRANSPORT: |
| 2592 | /* in case of transport mode, template does not store |
| 2593 | any IP addresses, hence we just compare mode and |
| 2594 | protocol */ |
| 2595 | match = 1; |
| 2596 | break; |
| 2597 | default: |
| 2598 | break; |
| 2599 | } |
| 2600 | } |
| 2601 | return match; |
| 2602 | } |
| 2603 | |
| 2604 | /* update endpoint address(es) of template(s) */ |
| 2605 | static int xfrm_policy_migrate(struct xfrm_policy *pol, |
| 2606 | struct xfrm_migrate *m, int num_migrate) |
| 2607 | { |
| 2608 | struct xfrm_migrate *mp; |
| 2609 | struct dst_entry *dst; |
| 2610 | int i, j, n = 0; |
| 2611 | |
| 2612 | write_lock_bh(&pol->lock); |
Herbert Xu | 12a169e | 2008-10-01 07:03:24 -0700 | [diff] [blame] | 2613 | if (unlikely(pol->walk.dead)) { |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2614 | /* target policy has been deleted */ |
| 2615 | write_unlock_bh(&pol->lock); |
| 2616 | return -ENOENT; |
| 2617 | } |
| 2618 | |
| 2619 | for (i = 0; i < pol->xfrm_nr; i++) { |
| 2620 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { |
| 2621 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) |
| 2622 | continue; |
| 2623 | n++; |
Herbert Xu | 1bfcb10 | 2007-10-17 21:31:50 -0700 | [diff] [blame] | 2624 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
| 2625 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2626 | continue; |
| 2627 | /* update endpoints */ |
| 2628 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, |
| 2629 | sizeof(pol->xfrm_vec[i].id.daddr)); |
| 2630 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, |
| 2631 | sizeof(pol->xfrm_vec[i].saddr)); |
| 2632 | pol->xfrm_vec[i].encap_family = mp->new_family; |
| 2633 | /* flush bundles */ |
| 2634 | while ((dst = pol->bundles) != NULL) { |
| 2635 | pol->bundles = dst->next; |
| 2636 | dst_free(dst); |
| 2637 | } |
| 2638 | } |
| 2639 | } |
| 2640 | |
| 2641 | write_unlock_bh(&pol->lock); |
| 2642 | |
| 2643 | if (!n) |
| 2644 | return -ENODATA; |
| 2645 | |
| 2646 | return 0; |
| 2647 | } |
| 2648 | |
| 2649 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) |
| 2650 | { |
| 2651 | int i, j; |
| 2652 | |
| 2653 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) |
| 2654 | return -EINVAL; |
| 2655 | |
| 2656 | for (i = 0; i < num_migrate; i++) { |
| 2657 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, |
| 2658 | m[i].old_family) == 0) && |
| 2659 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, |
| 2660 | m[i].old_family) == 0)) |
| 2661 | return -EINVAL; |
| 2662 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || |
| 2663 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) |
| 2664 | return -EINVAL; |
| 2665 | |
| 2666 | /* check if there is any duplicated entry */ |
| 2667 | for (j = i + 1; j < num_migrate; j++) { |
| 2668 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, |
| 2669 | sizeof(m[i].old_daddr)) && |
| 2670 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, |
| 2671 | sizeof(m[i].old_saddr)) && |
| 2672 | m[i].proto == m[j].proto && |
| 2673 | m[i].mode == m[j].mode && |
| 2674 | m[i].reqid == m[j].reqid && |
| 2675 | m[i].old_family == m[j].old_family) |
| 2676 | return -EINVAL; |
| 2677 | } |
| 2678 | } |
| 2679 | |
| 2680 | return 0; |
| 2681 | } |
| 2682 | |
| 2683 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
Arnaud Ebalard | 13c1d18 | 2008-10-05 13:33:42 -0700 | [diff] [blame] | 2684 | struct xfrm_migrate *m, int num_migrate, |
| 2685 | struct xfrm_kmaddress *k) |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2686 | { |
| 2687 | int i, err, nx_cur = 0, nx_new = 0; |
| 2688 | struct xfrm_policy *pol = NULL; |
| 2689 | struct xfrm_state *x, *xc; |
| 2690 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; |
| 2691 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; |
| 2692 | struct xfrm_migrate *mp; |
| 2693 | |
| 2694 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) |
| 2695 | goto out; |
| 2696 | |
| 2697 | /* Stage 1 - find policy */ |
| 2698 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { |
| 2699 | err = -ENOENT; |
| 2700 | goto out; |
| 2701 | } |
| 2702 | |
| 2703 | /* Stage 2 - find and update state(s) */ |
| 2704 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { |
| 2705 | if ((x = xfrm_migrate_state_find(mp))) { |
| 2706 | x_cur[nx_cur] = x; |
| 2707 | nx_cur++; |
| 2708 | if ((xc = xfrm_state_migrate(x, mp))) { |
| 2709 | x_new[nx_new] = xc; |
| 2710 | nx_new++; |
| 2711 | } else { |
| 2712 | err = -ENODATA; |
| 2713 | goto restore_state; |
| 2714 | } |
| 2715 | } |
| 2716 | } |
| 2717 | |
| 2718 | /* Stage 3 - update policy */ |
| 2719 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) |
| 2720 | goto restore_state; |
| 2721 | |
| 2722 | /* Stage 4 - delete old state(s) */ |
| 2723 | if (nx_cur) { |
| 2724 | xfrm_states_put(x_cur, nx_cur); |
| 2725 | xfrm_states_delete(x_cur, nx_cur); |
| 2726 | } |
| 2727 | |
| 2728 | /* Stage 5 - announce */ |
Arnaud Ebalard | 13c1d18 | 2008-10-05 13:33:42 -0700 | [diff] [blame] | 2729 | km_migrate(sel, dir, type, m, num_migrate, k); |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2730 | |
| 2731 | xfrm_pol_put(pol); |
| 2732 | |
| 2733 | return 0; |
| 2734 | out: |
| 2735 | return err; |
| 2736 | |
| 2737 | restore_state: |
| 2738 | if (pol) |
| 2739 | xfrm_pol_put(pol); |
| 2740 | if (nx_cur) |
| 2741 | xfrm_states_put(x_cur, nx_cur); |
| 2742 | if (nx_new) |
| 2743 | xfrm_states_delete(x_new, nx_new); |
| 2744 | |
| 2745 | return err; |
| 2746 | } |
David S. Miller | e610e67 | 2007-02-08 13:29:15 -0800 | [diff] [blame] | 2747 | EXPORT_SYMBOL(xfrm_migrate); |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2748 | #endif |