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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/slab.h> |
| 17 | #include <linux/kmod.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/workqueue.h> |
| 21 | #include <linux/notifier.h> |
| 22 | #include <linux/netdevice.h> |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 23 | #include <linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 25 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <net/xfrm.h> |
| 27 | #include <net/ip.h> |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 28 | #include <linux/audit.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 30 | #include "xfrm_hash.h" |
| 31 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 32 | DEFINE_MUTEX(xfrm_cfg_mutex); |
| 33 | EXPORT_SYMBOL(xfrm_cfg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | static DEFINE_RWLOCK(xfrm_policy_lock); |
| 36 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 37 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
| 38 | EXPORT_SYMBOL(xfrm_policy_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
| 41 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; |
| 42 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 43 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | static struct work_struct xfrm_policy_gc_work; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 46 | static HLIST_HEAD(xfrm_policy_gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
| 48 | |
| 49 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); |
| 50 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 51 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
| 52 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Andrew Morton | 7768102 | 2006-11-08 22:46:26 -0800 | [diff] [blame] | 54 | static inline int |
| 55 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 56 | { |
| 57 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && |
| 58 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && |
| 59 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 60 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 61 | (fl->proto == sel->proto || !sel->proto) && |
| 62 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 63 | } |
| 64 | |
| 65 | static inline int |
| 66 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 67 | { |
| 68 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && |
| 69 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && |
| 70 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 71 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 72 | (fl->proto == sel->proto || !sel->proto) && |
| 73 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 74 | } |
| 75 | |
| 76 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
| 77 | unsigned short family) |
| 78 | { |
| 79 | switch (family) { |
| 80 | case AF_INET: |
| 81 | return __xfrm4_selector_match(sel, fl); |
| 82 | case AF_INET6: |
| 83 | return __xfrm6_selector_match(sel, fl); |
| 84 | } |
| 85 | return 0; |
| 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
| 89 | { |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 90 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
| 91 | struct xfrm_type **typemap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | int err = 0; |
| 93 | |
| 94 | if (unlikely(afinfo == NULL)) |
| 95 | return -EAFNOSUPPORT; |
| 96 | typemap = afinfo->type_map; |
| 97 | |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 98 | if (likely(typemap[type->proto] == NULL)) |
| 99 | typemap[type->proto] = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | else |
| 101 | err = -EEXIST; |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 102 | xfrm_policy_unlock_afinfo(afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return err; |
| 104 | } |
| 105 | EXPORT_SYMBOL(xfrm_register_type); |
| 106 | |
| 107 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) |
| 108 | { |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 109 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
| 110 | struct xfrm_type **typemap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | int err = 0; |
| 112 | |
| 113 | if (unlikely(afinfo == NULL)) |
| 114 | return -EAFNOSUPPORT; |
| 115 | typemap = afinfo->type_map; |
| 116 | |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 117 | if (unlikely(typemap[type->proto] != type)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | err = -ENOENT; |
| 119 | else |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 120 | typemap[type->proto] = NULL; |
| 121 | xfrm_policy_unlock_afinfo(afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return err; |
| 123 | } |
| 124 | EXPORT_SYMBOL(xfrm_unregister_type); |
| 125 | |
| 126 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
| 127 | { |
| 128 | struct xfrm_policy_afinfo *afinfo; |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 129 | struct xfrm_type **typemap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | struct xfrm_type *type; |
| 131 | int modload_attempted = 0; |
| 132 | |
| 133 | retry: |
| 134 | afinfo = xfrm_policy_get_afinfo(family); |
| 135 | if (unlikely(afinfo == NULL)) |
| 136 | return NULL; |
| 137 | typemap = afinfo->type_map; |
| 138 | |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 139 | type = typemap[proto]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | if (unlikely(type && !try_module_get(type->owner))) |
| 141 | type = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | if (!type && !modload_attempted) { |
| 143 | xfrm_policy_put_afinfo(afinfo); |
| 144 | request_module("xfrm-type-%d-%d", |
| 145 | (int) family, (int) proto); |
| 146 | modload_attempted = 1; |
| 147 | goto retry; |
| 148 | } |
| 149 | |
| 150 | xfrm_policy_put_afinfo(afinfo); |
| 151 | return type; |
| 152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 154 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | unsigned short family) |
| 156 | { |
| 157 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 158 | int err = 0; |
| 159 | |
| 160 | if (unlikely(afinfo == NULL)) |
| 161 | return -EAFNOSUPPORT; |
| 162 | |
| 163 | if (likely(afinfo->dst_lookup != NULL)) |
| 164 | err = afinfo->dst_lookup(dst, fl); |
| 165 | else |
| 166 | err = -EINVAL; |
| 167 | xfrm_policy_put_afinfo(afinfo); |
| 168 | return err; |
| 169 | } |
| 170 | EXPORT_SYMBOL(xfrm_dst_lookup); |
| 171 | |
| 172 | void xfrm_put_type(struct xfrm_type *type) |
| 173 | { |
| 174 | module_put(type->owner); |
| 175 | } |
| 176 | |
Herbert Xu | b59f45d | 2006-05-27 23:05:54 -0700 | [diff] [blame] | 177 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
| 178 | { |
| 179 | struct xfrm_policy_afinfo *afinfo; |
| 180 | struct xfrm_mode **modemap; |
| 181 | int err; |
| 182 | |
| 183 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) |
| 184 | return -EINVAL; |
| 185 | |
| 186 | afinfo = xfrm_policy_lock_afinfo(family); |
| 187 | if (unlikely(afinfo == NULL)) |
| 188 | return -EAFNOSUPPORT; |
| 189 | |
| 190 | err = -EEXIST; |
| 191 | modemap = afinfo->mode_map; |
| 192 | if (likely(modemap[mode->encap] == NULL)) { |
| 193 | modemap[mode->encap] = mode; |
| 194 | err = 0; |
| 195 | } |
| 196 | |
| 197 | xfrm_policy_unlock_afinfo(afinfo); |
| 198 | return err; |
| 199 | } |
| 200 | EXPORT_SYMBOL(xfrm_register_mode); |
| 201 | |
| 202 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) |
| 203 | { |
| 204 | struct xfrm_policy_afinfo *afinfo; |
| 205 | struct xfrm_mode **modemap; |
| 206 | int err; |
| 207 | |
| 208 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) |
| 209 | return -EINVAL; |
| 210 | |
| 211 | afinfo = xfrm_policy_lock_afinfo(family); |
| 212 | if (unlikely(afinfo == NULL)) |
| 213 | return -EAFNOSUPPORT; |
| 214 | |
| 215 | err = -ENOENT; |
| 216 | modemap = afinfo->mode_map; |
| 217 | if (likely(modemap[mode->encap] == mode)) { |
| 218 | modemap[mode->encap] = NULL; |
| 219 | err = 0; |
| 220 | } |
| 221 | |
| 222 | xfrm_policy_unlock_afinfo(afinfo); |
| 223 | return err; |
| 224 | } |
| 225 | EXPORT_SYMBOL(xfrm_unregister_mode); |
| 226 | |
| 227 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) |
| 228 | { |
| 229 | struct xfrm_policy_afinfo *afinfo; |
| 230 | struct xfrm_mode *mode; |
| 231 | int modload_attempted = 0; |
| 232 | |
| 233 | if (unlikely(encap >= XFRM_MODE_MAX)) |
| 234 | return NULL; |
| 235 | |
| 236 | retry: |
| 237 | afinfo = xfrm_policy_get_afinfo(family); |
| 238 | if (unlikely(afinfo == NULL)) |
| 239 | return NULL; |
| 240 | |
| 241 | mode = afinfo->mode_map[encap]; |
| 242 | if (unlikely(mode && !try_module_get(mode->owner))) |
| 243 | mode = NULL; |
| 244 | if (!mode && !modload_attempted) { |
| 245 | xfrm_policy_put_afinfo(afinfo); |
| 246 | request_module("xfrm-mode-%d-%d", family, encap); |
| 247 | modload_attempted = 1; |
| 248 | goto retry; |
| 249 | } |
| 250 | |
| 251 | xfrm_policy_put_afinfo(afinfo); |
| 252 | return mode; |
| 253 | } |
| 254 | |
| 255 | void xfrm_put_mode(struct xfrm_mode *mode) |
| 256 | { |
| 257 | module_put(mode->owner); |
| 258 | } |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | static inline unsigned long make_jiffies(long secs) |
| 261 | { |
| 262 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) |
| 263 | return MAX_SCHEDULE_TIMEOUT-1; |
| 264 | else |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 265 | return secs*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | static void xfrm_policy_timer(unsigned long data) |
| 269 | { |
| 270 | struct xfrm_policy *xp = (struct xfrm_policy*)data; |
| 271 | unsigned long now = (unsigned long)xtime.tv_sec; |
| 272 | long next = LONG_MAX; |
| 273 | int warn = 0; |
| 274 | int dir; |
| 275 | |
| 276 | read_lock(&xp->lock); |
| 277 | |
| 278 | if (xp->dead) |
| 279 | goto out; |
| 280 | |
Herbert Xu | 77d8d7a | 2005-10-05 12:15:12 -0700 | [diff] [blame] | 281 | dir = xfrm_policy_id2dir(xp->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | if (xp->lft.hard_add_expires_seconds) { |
| 284 | long tmo = xp->lft.hard_add_expires_seconds + |
| 285 | xp->curlft.add_time - now; |
| 286 | if (tmo <= 0) |
| 287 | goto expired; |
| 288 | if (tmo < next) |
| 289 | next = tmo; |
| 290 | } |
| 291 | if (xp->lft.hard_use_expires_seconds) { |
| 292 | long tmo = xp->lft.hard_use_expires_seconds + |
| 293 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 294 | if (tmo <= 0) |
| 295 | goto expired; |
| 296 | if (tmo < next) |
| 297 | next = tmo; |
| 298 | } |
| 299 | if (xp->lft.soft_add_expires_seconds) { |
| 300 | long tmo = xp->lft.soft_add_expires_seconds + |
| 301 | xp->curlft.add_time - now; |
| 302 | if (tmo <= 0) { |
| 303 | warn = 1; |
| 304 | tmo = XFRM_KM_TIMEOUT; |
| 305 | } |
| 306 | if (tmo < next) |
| 307 | next = tmo; |
| 308 | } |
| 309 | if (xp->lft.soft_use_expires_seconds) { |
| 310 | long tmo = xp->lft.soft_use_expires_seconds + |
| 311 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 312 | if (tmo <= 0) { |
| 313 | warn = 1; |
| 314 | tmo = XFRM_KM_TIMEOUT; |
| 315 | } |
| 316 | if (tmo < next) |
| 317 | next = tmo; |
| 318 | } |
| 319 | |
| 320 | if (warn) |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 321 | km_policy_expired(xp, dir, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (next != LONG_MAX && |
| 323 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) |
| 324 | xfrm_pol_hold(xp); |
| 325 | |
| 326 | out: |
| 327 | read_unlock(&xp->lock); |
| 328 | xfrm_pol_put(xp); |
| 329 | return; |
| 330 | |
| 331 | expired: |
| 332 | read_unlock(&xp->lock); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 333 | if (!xfrm_policy_delete(xp, dir)) |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 334 | km_policy_expired(xp, dir, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | xfrm_pol_put(xp); |
| 336 | } |
| 337 | |
| 338 | |
| 339 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 |
| 340 | * SPD calls. |
| 341 | */ |
| 342 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 343 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
| 345 | struct xfrm_policy *policy; |
| 346 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 347 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
| 349 | if (policy) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 350 | INIT_HLIST_NODE(&policy->bydst); |
| 351 | INIT_HLIST_NODE(&policy->byidx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | rwlock_init(&policy->lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 353 | atomic_set(&policy->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | init_timer(&policy->timer); |
| 355 | policy->timer.data = (unsigned long)policy; |
| 356 | policy->timer.function = xfrm_policy_timer; |
| 357 | } |
| 358 | return policy; |
| 359 | } |
| 360 | EXPORT_SYMBOL(xfrm_policy_alloc); |
| 361 | |
| 362 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ |
| 363 | |
| 364 | void __xfrm_policy_destroy(struct xfrm_policy *policy) |
| 365 | { |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 366 | BUG_ON(!policy->dead); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 368 | BUG_ON(policy->bundles); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | if (del_timer(&policy->timer)) |
| 371 | BUG(); |
| 372 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 373 | security_xfrm_policy_free(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | kfree(policy); |
| 375 | } |
| 376 | EXPORT_SYMBOL(__xfrm_policy_destroy); |
| 377 | |
| 378 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) |
| 379 | { |
| 380 | struct dst_entry *dst; |
| 381 | |
| 382 | while ((dst = policy->bundles) != NULL) { |
| 383 | policy->bundles = dst->next; |
| 384 | dst_free(dst); |
| 385 | } |
| 386 | |
| 387 | if (del_timer(&policy->timer)) |
| 388 | atomic_dec(&policy->refcnt); |
| 389 | |
| 390 | if (atomic_read(&policy->refcnt) > 1) |
| 391 | flow_cache_flush(); |
| 392 | |
| 393 | xfrm_pol_put(policy); |
| 394 | } |
| 395 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 396 | static void xfrm_policy_gc_task(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
| 398 | struct xfrm_policy *policy; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 399 | struct hlist_node *entry, *tmp; |
| 400 | struct hlist_head gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | spin_lock_bh(&xfrm_policy_gc_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 403 | gc_list.first = xfrm_policy_gc_list.first; |
| 404 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | spin_unlock_bh(&xfrm_policy_gc_lock); |
| 406 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 407 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | xfrm_policy_gc_kill(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | /* Rule must be locked. Release descentant resources, announce |
| 412 | * entry dead. The rule must be unlinked from lists to the moment. |
| 413 | */ |
| 414 | |
| 415 | static void xfrm_policy_kill(struct xfrm_policy *policy) |
| 416 | { |
| 417 | int dead; |
| 418 | |
| 419 | write_lock_bh(&policy->lock); |
| 420 | dead = policy->dead; |
| 421 | policy->dead = 1; |
| 422 | write_unlock_bh(&policy->lock); |
| 423 | |
| 424 | if (unlikely(dead)) { |
| 425 | WARN_ON(1); |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | spin_lock(&xfrm_policy_gc_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 430 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | spin_unlock(&xfrm_policy_gc_lock); |
| 432 | |
| 433 | schedule_work(&xfrm_policy_gc_work); |
| 434 | } |
| 435 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 436 | struct xfrm_policy_hash { |
| 437 | struct hlist_head *table; |
| 438 | unsigned int hmask; |
| 439 | }; |
| 440 | |
| 441 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; |
| 442 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; |
| 443 | static struct hlist_head *xfrm_policy_byidx __read_mostly; |
| 444 | static unsigned int xfrm_idx_hmask __read_mostly; |
| 445 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
| 446 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 447 | static inline unsigned int idx_hash(u32 index) |
| 448 | { |
| 449 | return __idx_hash(index, xfrm_idx_hmask); |
| 450 | } |
| 451 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 452 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
| 453 | { |
| 454 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 455 | unsigned int hash = __sel_hash(sel, family, hmask); |
| 456 | |
| 457 | return (hash == hmask + 1 ? |
| 458 | &xfrm_policy_inexact[dir] : |
| 459 | xfrm_policy_bydst[dir].table + hash); |
| 460 | } |
| 461 | |
| 462 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
| 463 | { |
| 464 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 465 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
| 466 | |
| 467 | return xfrm_policy_bydst[dir].table + hash; |
| 468 | } |
| 469 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 470 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
| 471 | struct hlist_head *ndsttable, |
| 472 | unsigned int nhashmask) |
| 473 | { |
| 474 | struct hlist_node *entry, *tmp; |
| 475 | struct xfrm_policy *pol; |
| 476 | |
| 477 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
| 478 | unsigned int h; |
| 479 | |
| 480 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
| 481 | pol->family, nhashmask); |
| 482 | hlist_add_head(&pol->bydst, ndsttable+h); |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | static void xfrm_idx_hash_transfer(struct hlist_head *list, |
| 487 | struct hlist_head *nidxtable, |
| 488 | unsigned int nhashmask) |
| 489 | { |
| 490 | struct hlist_node *entry, *tmp; |
| 491 | struct xfrm_policy *pol; |
| 492 | |
| 493 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { |
| 494 | unsigned int h; |
| 495 | |
| 496 | h = __idx_hash(pol->index, nhashmask); |
| 497 | hlist_add_head(&pol->byidx, nidxtable+h); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) |
| 502 | { |
| 503 | return ((old_hmask + 1) << 1) - 1; |
| 504 | } |
| 505 | |
| 506 | static void xfrm_bydst_resize(int dir) |
| 507 | { |
| 508 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 509 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 510 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 511 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 512 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 513 | int i; |
| 514 | |
| 515 | if (!ndst) |
| 516 | return; |
| 517 | |
| 518 | write_lock_bh(&xfrm_policy_lock); |
| 519 | |
| 520 | for (i = hmask; i >= 0; i--) |
| 521 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); |
| 522 | |
| 523 | xfrm_policy_bydst[dir].table = ndst; |
| 524 | xfrm_policy_bydst[dir].hmask = nhashmask; |
| 525 | |
| 526 | write_unlock_bh(&xfrm_policy_lock); |
| 527 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 528 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static void xfrm_byidx_resize(int total) |
| 532 | { |
| 533 | unsigned int hmask = xfrm_idx_hmask; |
| 534 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 535 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 536 | struct hlist_head *oidx = xfrm_policy_byidx; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 537 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 538 | int i; |
| 539 | |
| 540 | if (!nidx) |
| 541 | return; |
| 542 | |
| 543 | write_lock_bh(&xfrm_policy_lock); |
| 544 | |
| 545 | for (i = hmask; i >= 0; i--) |
| 546 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); |
| 547 | |
| 548 | xfrm_policy_byidx = nidx; |
| 549 | xfrm_idx_hmask = nhashmask; |
| 550 | |
| 551 | write_unlock_bh(&xfrm_policy_lock); |
| 552 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 553 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | static inline int xfrm_bydst_should_resize(int dir, int *total) |
| 557 | { |
| 558 | unsigned int cnt = xfrm_policy_count[dir]; |
| 559 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; |
| 560 | |
| 561 | if (total) |
| 562 | *total += cnt; |
| 563 | |
| 564 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 565 | cnt > hmask) |
| 566 | return 1; |
| 567 | |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static inline int xfrm_byidx_should_resize(int total) |
| 572 | { |
| 573 | unsigned int hmask = xfrm_idx_hmask; |
| 574 | |
| 575 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 576 | total > hmask) |
| 577 | return 1; |
| 578 | |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | static DEFINE_MUTEX(hash_resize_mutex); |
| 583 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 584 | static void xfrm_hash_resize(struct work_struct *__unused) |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 585 | { |
| 586 | int dir, total; |
| 587 | |
| 588 | mutex_lock(&hash_resize_mutex); |
| 589 | |
| 590 | total = 0; |
| 591 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 592 | if (xfrm_bydst_should_resize(dir, &total)) |
| 593 | xfrm_bydst_resize(dir); |
| 594 | } |
| 595 | if (xfrm_byidx_should_resize(total)) |
| 596 | xfrm_byidx_resize(total); |
| 597 | |
| 598 | mutex_unlock(&hash_resize_mutex); |
| 599 | } |
| 600 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 601 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | /* Generate new index... KAME seems to generate them ordered by cost |
| 604 | * of an absolute inpredictability of ordering of rules. This will not pass. */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 605 | static u32 xfrm_gen_index(u8 type, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | static u32 idx_generator; |
| 608 | |
| 609 | for (;;) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 610 | struct hlist_node *entry; |
| 611 | struct hlist_head *list; |
| 612 | struct xfrm_policy *p; |
| 613 | u32 idx; |
| 614 | int found; |
| 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | idx = (idx_generator | dir); |
| 617 | idx_generator += 8; |
| 618 | if (idx == 0) |
| 619 | idx = 8; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 620 | list = xfrm_policy_byidx + idx_hash(idx); |
| 621 | found = 0; |
| 622 | hlist_for_each_entry(p, entry, list, byidx) { |
| 623 | if (p->index == idx) { |
| 624 | found = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | break; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 628 | if (!found) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | return idx; |
| 630 | } |
| 631 | } |
| 632 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 633 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
| 634 | { |
| 635 | u32 *p1 = (u32 *) s1; |
| 636 | u32 *p2 = (u32 *) s2; |
| 637 | int len = sizeof(struct xfrm_selector) / sizeof(u32); |
| 638 | int i; |
| 639 | |
| 640 | for (i = 0; i < len; i++) { |
| 641 | if (p1[i] != p2[i]) |
| 642 | return 1; |
| 643 | } |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
| 649 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 650 | struct xfrm_policy *pol; |
| 651 | struct xfrm_policy *delpol; |
| 652 | struct hlist_head *chain; |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 653 | struct hlist_node *entry, *newpos; |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 654 | struct dst_entry *gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 657 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
| 658 | delpol = NULL; |
| 659 | newpos = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 660 | hlist_for_each_entry(pol, entry, chain, bydst) { |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 661 | if (pol->type == policy->type && |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 662 | !selector_cmp(&pol->selector, &policy->selector) && |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 663 | xfrm_sec_ctx_match(pol->security, policy->security) && |
| 664 | !WARN_ON(delpol)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | if (excl) { |
| 666 | write_unlock_bh(&xfrm_policy_lock); |
| 667 | return -EEXIST; |
| 668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | delpol = pol; |
| 670 | if (policy->priority > pol->priority) |
| 671 | continue; |
| 672 | } else if (policy->priority >= pol->priority) { |
Herbert Xu | a6c7ab5 | 2007-01-16 16:52:02 -0800 | [diff] [blame] | 673 | newpos = &pol->bydst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | continue; |
| 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (delpol) |
| 677 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | if (newpos) |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 680 | hlist_add_after(newpos, &policy->bydst); |
| 681 | else |
| 682 | hlist_add_head(&policy->bydst, chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | xfrm_pol_hold(policy); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 684 | xfrm_policy_count[dir]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 686 | if (delpol) { |
| 687 | hlist_del(&delpol->bydst); |
| 688 | hlist_del(&delpol->byidx); |
| 689 | xfrm_policy_count[dir]--; |
| 690 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 691 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 692 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | policy->curlft.add_time = (unsigned long)xtime.tv_sec; |
| 694 | policy->curlft.use_time = 0; |
| 695 | if (!mod_timer(&policy->timer, jiffies + HZ)) |
| 696 | xfrm_pol_hold(policy); |
| 697 | write_unlock_bh(&xfrm_policy_lock); |
| 698 | |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 699 | if (delpol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | xfrm_policy_kill(delpol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 701 | else if (xfrm_bydst_should_resize(dir, NULL)) |
| 702 | schedule_work(&xfrm_hash_work); |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 703 | |
| 704 | read_lock_bh(&xfrm_policy_lock); |
| 705 | gc_list = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 706 | entry = &policy->bydst; |
| 707 | hlist_for_each_entry_continue(policy, entry, bydst) { |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 708 | struct dst_entry *dst; |
| 709 | |
| 710 | write_lock(&policy->lock); |
| 711 | dst = policy->bundles; |
| 712 | if (dst) { |
| 713 | struct dst_entry *tail = dst; |
| 714 | while (tail->next) |
| 715 | tail = tail->next; |
| 716 | tail->next = gc_list; |
| 717 | gc_list = dst; |
| 718 | |
| 719 | policy->bundles = NULL; |
| 720 | } |
| 721 | write_unlock(&policy->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
David S. Miller | 9b78a82 | 2005-12-22 07:39:48 -0800 | [diff] [blame] | 723 | read_unlock_bh(&xfrm_policy_lock); |
| 724 | |
| 725 | while (gc_list) { |
| 726 | struct dst_entry *dst = gc_list; |
| 727 | |
| 728 | gc_list = dst->next; |
| 729 | dst_free(dst); |
| 730 | } |
| 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | return 0; |
| 733 | } |
| 734 | EXPORT_SYMBOL(xfrm_policy_insert); |
| 735 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 736 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
| 737 | struct xfrm_selector *sel, |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 738 | struct xfrm_sec_ctx *ctx, int delete) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 740 | struct xfrm_policy *pol, *ret; |
| 741 | struct hlist_head *chain; |
| 742 | struct hlist_node *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 745 | chain = policy_hash_bysel(sel, sel->family, dir); |
| 746 | ret = NULL; |
| 747 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 748 | if (pol->type == type && |
| 749 | !selector_cmp(sel, &pol->selector) && |
| 750 | xfrm_sec_ctx_match(ctx, pol->security)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 752 | if (delete) { |
| 753 | hlist_del(&pol->bydst); |
| 754 | hlist_del(&pol->byidx); |
| 755 | xfrm_policy_count[dir]--; |
| 756 | } |
| 757 | ret = pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | break; |
| 759 | } |
| 760 | } |
| 761 | write_unlock_bh(&xfrm_policy_lock); |
| 762 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 763 | if (ret && delete) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 765 | xfrm_policy_kill(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 767 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 769 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 771 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 773 | struct xfrm_policy *pol, *ret; |
| 774 | struct hlist_head *chain; |
| 775 | struct hlist_node *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 778 | chain = xfrm_policy_byidx + idx_hash(id); |
| 779 | ret = NULL; |
| 780 | hlist_for_each_entry(pol, entry, chain, byidx) { |
| 781 | if (pol->type == type && pol->index == id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 783 | if (delete) { |
| 784 | hlist_del(&pol->bydst); |
| 785 | hlist_del(&pol->byidx); |
| 786 | xfrm_policy_count[dir]--; |
| 787 | } |
| 788 | ret = pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | break; |
| 790 | } |
| 791 | } |
| 792 | write_unlock_bh(&xfrm_policy_lock); |
| 793 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 794 | if (ret && delete) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | atomic_inc(&flow_cache_genid); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 796 | xfrm_policy_kill(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 798 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | EXPORT_SYMBOL(xfrm_policy_byid); |
| 801 | |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 802 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | int dir; |
| 805 | |
| 806 | write_lock_bh(&xfrm_policy_lock); |
| 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 | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 822 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
| 823 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); |
| 824 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 825 | xfrm_policy_kill(pol); |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 826 | killed++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | write_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 829 | goto again1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 831 | |
| 832 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 833 | again2: |
| 834 | hlist_for_each_entry(pol, entry, |
| 835 | xfrm_policy_bydst[dir].table + i, |
| 836 | bydst) { |
| 837 | if (pol->type != type) |
| 838 | continue; |
| 839 | hlist_del(&pol->bydst); |
| 840 | hlist_del(&pol->byidx); |
| 841 | write_unlock_bh(&xfrm_policy_lock); |
| 842 | |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 843 | xfrm_audit_log(audit_info->loginuid, |
| 844 | audit_info->secid, |
| 845 | AUDIT_MAC_IPSEC_DELSPD, 1, |
| 846 | pol, NULL); |
| 847 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 848 | xfrm_policy_kill(pol); |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 849 | killed++; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 850 | |
| 851 | write_lock_bh(&xfrm_policy_lock); |
| 852 | goto again2; |
| 853 | } |
| 854 | } |
| 855 | |
David S. Miller | ae8c057 | 2006-10-03 16:00:26 -0700 | [diff] [blame] | 856 | xfrm_policy_count[dir] -= killed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
| 858 | atomic_inc(&flow_cache_genid); |
| 859 | write_unlock_bh(&xfrm_policy_lock); |
| 860 | } |
| 861 | EXPORT_SYMBOL(xfrm_policy_flush); |
| 862 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 863 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | void *data) |
| 865 | { |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 866 | struct xfrm_policy *pol, *last = NULL; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 867 | struct hlist_node *entry; |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 868 | int dir, last_dir = 0, count, error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | read_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 871 | count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 874 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
| 875 | int i; |
| 876 | |
| 877 | hlist_for_each_entry(pol, entry, |
| 878 | &xfrm_policy_inexact[dir], bydst) { |
| 879 | if (pol->type != type) |
| 880 | continue; |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 881 | if (last) { |
| 882 | error = func(last, last_dir % XFRM_POLICY_MAX, |
| 883 | count, data); |
| 884 | if (error) |
| 885 | goto out; |
| 886 | } |
| 887 | last = pol; |
| 888 | last_dir = dir; |
| 889 | count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 891 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 892 | hlist_for_each_entry(pol, entry, table + i, bydst) { |
| 893 | if (pol->type != type) |
| 894 | continue; |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 895 | if (last) { |
| 896 | error = func(last, last_dir % XFRM_POLICY_MAX, |
| 897 | count, data); |
| 898 | if (error) |
| 899 | goto out; |
| 900 | } |
| 901 | last = pol; |
| 902 | last_dir = dir; |
| 903 | count++; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 904 | } |
| 905 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
Jamal Hadi Salim | baf5d74 | 2006-12-04 20:02:37 -0800 | [diff] [blame] | 907 | if (count == 0) { |
| 908 | error = -ENOENT; |
| 909 | goto out; |
| 910 | } |
| 911 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | out: |
| 913 | read_unlock_bh(&xfrm_policy_lock); |
| 914 | return error; |
| 915 | } |
| 916 | EXPORT_SYMBOL(xfrm_policy_walk); |
| 917 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 918 | /* |
| 919 | * Find policy to apply to this flow. |
| 920 | * |
| 921 | * Returns 0 if policy found, else an -errno. |
| 922 | */ |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 923 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
| 924 | u8 type, u16 family, int dir) |
| 925 | { |
| 926 | struct xfrm_selector *sel = &pol->selector; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 927 | int match, ret = -ESRCH; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 928 | |
| 929 | if (pol->family != family || |
| 930 | pol->type != type) |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 931 | return ret; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 932 | |
| 933 | match = xfrm_selector_match(sel, fl, family); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 934 | if (match) |
| 935 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 936 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 937 | return ret; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 938 | } |
| 939 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 940 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
| 941 | u16 family, u8 dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 943 | int err; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 944 | struct xfrm_policy *pol, *ret; |
| 945 | xfrm_address_t *daddr, *saddr; |
| 946 | struct hlist_node *entry; |
| 947 | struct hlist_head *chain; |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 948 | u32 priority = ~0U; |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 949 | |
| 950 | daddr = xfrm_flowi_daddr(fl, family); |
| 951 | saddr = xfrm_flowi_saddr(fl, family); |
| 952 | if (unlikely(!daddr || !saddr)) |
| 953 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
| 955 | read_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 956 | chain = policy_hash_direct(daddr, saddr, family, dir); |
| 957 | ret = NULL; |
| 958 | hlist_for_each_entry(pol, entry, chain, bydst) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 959 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 960 | if (err) { |
| 961 | if (err == -ESRCH) |
| 962 | continue; |
| 963 | else { |
| 964 | ret = ERR_PTR(err); |
| 965 | goto fail; |
| 966 | } |
| 967 | } else { |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 968 | ret = pol; |
| 969 | priority = ret->priority; |
| 970 | break; |
| 971 | } |
| 972 | } |
| 973 | chain = &xfrm_policy_inexact[dir]; |
| 974 | hlist_for_each_entry(pol, entry, chain, bydst) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 975 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 976 | if (err) { |
| 977 | if (err == -ESRCH) |
| 978 | continue; |
| 979 | else { |
| 980 | ret = ERR_PTR(err); |
| 981 | goto fail; |
| 982 | } |
| 983 | } else if (pol->priority < priority) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 984 | ret = pol; |
| 985 | break; |
| 986 | } |
| 987 | } |
David S. Miller | acba48e | 2006-08-25 15:46:46 -0700 | [diff] [blame] | 988 | if (ret) |
| 989 | xfrm_pol_hold(ret); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 990 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | read_unlock_bh(&xfrm_policy_lock); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 992 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 993 | return ret; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 994 | } |
| 995 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 996 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 997 | void **objp, atomic_t **obj_refp) |
| 998 | { |
| 999 | struct xfrm_policy *pol; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1000 | int err = 0; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1001 | |
| 1002 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1003 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1004 | if (IS_ERR(pol)) { |
| 1005 | err = PTR_ERR(pol); |
| 1006 | pol = NULL; |
| 1007 | } |
| 1008 | if (pol || err) |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1009 | goto end; |
| 1010 | #endif |
| 1011 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1012 | if (IS_ERR(pol)) { |
| 1013 | err = PTR_ERR(pol); |
| 1014 | pol = NULL; |
| 1015 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1016 | #ifdef CONFIG_XFRM_SUB_POLICY |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1017 | end: |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1018 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | if ((*objp = (void *) pol) != NULL) |
| 1020 | *obj_refp = &pol->refcnt; |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1021 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } |
| 1023 | |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1024 | static inline int policy_to_flow_dir(int dir) |
| 1025 | { |
| 1026 | if (XFRM_POLICY_IN == FLOW_DIR_IN && |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1027 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
| 1028 | XFRM_POLICY_FWD == FLOW_DIR_FWD) |
| 1029 | return dir; |
| 1030 | switch (dir) { |
| 1031 | default: |
| 1032 | case XFRM_POLICY_IN: |
| 1033 | return FLOW_DIR_IN; |
| 1034 | case XFRM_POLICY_OUT: |
| 1035 | return FLOW_DIR_OUT; |
| 1036 | case XFRM_POLICY_FWD: |
| 1037 | return FLOW_DIR_FWD; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1038 | }; |
| 1039 | } |
| 1040 | |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1041 | 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] | 1042 | { |
| 1043 | struct xfrm_policy *pol; |
| 1044 | |
| 1045 | read_lock_bh(&xfrm_policy_lock); |
| 1046 | if ((pol = sk->sk_policy[dir]) != NULL) { |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1047 | int match = xfrm_selector_match(&pol->selector, fl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | sk->sk_family); |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1049 | int err = 0; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1050 | |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1051 | if (match) { |
| 1052 | err = security_xfrm_policy_lookup(pol, fl->secid, |
| 1053 | policy_to_flow_dir(dir)); |
| 1054 | if (!err) |
| 1055 | xfrm_pol_hold(pol); |
| 1056 | else if (err == -ESRCH) |
| 1057 | pol = NULL; |
| 1058 | else |
| 1059 | pol = ERR_PTR(err); |
| 1060 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | pol = NULL; |
| 1062 | } |
| 1063 | read_unlock_bh(&xfrm_policy_lock); |
| 1064 | return pol; |
| 1065 | } |
| 1066 | |
| 1067 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) |
| 1068 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1069 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
| 1070 | pol->family, dir); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1071 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1072 | hlist_add_head(&pol->bydst, chain); |
| 1073 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); |
| 1074 | xfrm_policy_count[dir]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | xfrm_pol_hold(pol); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1076 | |
| 1077 | if (xfrm_bydst_should_resize(dir, NULL)) |
| 1078 | schedule_work(&xfrm_hash_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | } |
| 1080 | |
| 1081 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| 1082 | int dir) |
| 1083 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1084 | if (hlist_unhashed(&pol->bydst)) |
| 1085 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1087 | hlist_del(&pol->bydst); |
| 1088 | hlist_del(&pol->byidx); |
| 1089 | xfrm_policy_count[dir]--; |
| 1090 | |
| 1091 | return pol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
| 1093 | |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1094 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | { |
| 1096 | write_lock_bh(&xfrm_policy_lock); |
| 1097 | pol = __xfrm_policy_unlink(pol, dir); |
| 1098 | write_unlock_bh(&xfrm_policy_lock); |
| 1099 | if (pol) { |
| 1100 | if (dir < XFRM_POLICY_MAX) |
| 1101 | atomic_inc(&flow_cache_genid); |
| 1102 | xfrm_policy_kill(pol); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1103 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | } |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 1105 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | } |
David S. Miller | a70fcb0 | 2006-03-20 19:18:52 -0800 | [diff] [blame] | 1107 | EXPORT_SYMBOL(xfrm_policy_delete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
| 1109 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) |
| 1110 | { |
| 1111 | struct xfrm_policy *old_pol; |
| 1112 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1113 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1114 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) |
| 1115 | return -EINVAL; |
| 1116 | #endif |
| 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | write_lock_bh(&xfrm_policy_lock); |
| 1119 | old_pol = sk->sk_policy[dir]; |
| 1120 | sk->sk_policy[dir] = pol; |
| 1121 | if (pol) { |
| 1122 | pol->curlft.add_time = (unsigned long)xtime.tv_sec; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1123 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
| 1125 | } |
| 1126 | if (old_pol) |
| 1127 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
| 1128 | write_unlock_bh(&xfrm_policy_lock); |
| 1129 | |
| 1130 | if (old_pol) { |
| 1131 | xfrm_policy_kill(old_pol); |
| 1132 | } |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) |
| 1137 | { |
| 1138 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); |
| 1139 | |
| 1140 | if (newp) { |
| 1141 | newp->selector = old->selector; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1142 | if (security_xfrm_policy_clone(old, newp)) { |
| 1143 | kfree(newp); |
| 1144 | return NULL; /* ENOMEM */ |
| 1145 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | newp->lft = old->lft; |
| 1147 | newp->curlft = old->curlft; |
| 1148 | newp->action = old->action; |
| 1149 | newp->flags = old->flags; |
| 1150 | newp->xfrm_nr = old->xfrm_nr; |
| 1151 | newp->index = old->index; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1152 | newp->type = old->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
| 1154 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); |
| 1155 | write_lock_bh(&xfrm_policy_lock); |
| 1156 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
| 1157 | write_unlock_bh(&xfrm_policy_lock); |
| 1158 | xfrm_pol_put(newp); |
| 1159 | } |
| 1160 | return newp; |
| 1161 | } |
| 1162 | |
| 1163 | int __xfrm_sk_clone_policy(struct sock *sk) |
| 1164 | { |
| 1165 | struct xfrm_policy *p0 = sk->sk_policy[0], |
| 1166 | *p1 = sk->sk_policy[1]; |
| 1167 | |
| 1168 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; |
| 1169 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) |
| 1170 | return -ENOMEM; |
| 1171 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) |
| 1172 | return -ENOMEM; |
| 1173 | return 0; |
| 1174 | } |
| 1175 | |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1176 | static int |
| 1177 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, |
| 1178 | unsigned short family) |
| 1179 | { |
| 1180 | int err; |
| 1181 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1182 | |
| 1183 | if (unlikely(afinfo == NULL)) |
| 1184 | return -EINVAL; |
| 1185 | err = afinfo->get_saddr(local, remote); |
| 1186 | xfrm_policy_put_afinfo(afinfo); |
| 1187 | return err; |
| 1188 | } |
| 1189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | /* Resolve list of templates for the flow, given policy. */ |
| 1191 | |
| 1192 | static int |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1193 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
| 1194 | struct xfrm_state **xfrm, |
| 1195 | unsigned short family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | { |
| 1197 | int nx; |
| 1198 | int i, error; |
| 1199 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); |
| 1200 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1201 | xfrm_address_t tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { |
| 1204 | struct xfrm_state *x; |
| 1205 | xfrm_address_t *remote = daddr; |
| 1206 | xfrm_address_t *local = saddr; |
| 1207 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; |
| 1208 | |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 1209 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | remote = &tmpl->id.daddr; |
| 1211 | local = &tmpl->saddr; |
Miika Komu | 76b3f05 | 2006-11-30 16:40:43 -0800 | [diff] [blame] | 1212 | family = tmpl->encap_family; |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 1213 | if (xfrm_addr_any(local, family)) { |
| 1214 | error = xfrm_get_saddr(&tmp, remote, family); |
| 1215 | if (error) |
| 1216 | goto fail; |
| 1217 | local = &tmp; |
| 1218 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); |
| 1222 | |
| 1223 | if (x && x->km.state == XFRM_STATE_VALID) { |
| 1224 | xfrm[nx++] = x; |
| 1225 | daddr = remote; |
| 1226 | saddr = local; |
| 1227 | continue; |
| 1228 | } |
| 1229 | if (x) { |
| 1230 | error = (x->km.state == XFRM_STATE_ERROR ? |
| 1231 | -EINVAL : -EAGAIN); |
| 1232 | xfrm_state_put(x); |
| 1233 | } |
| 1234 | |
| 1235 | if (!tmpl->optional) |
| 1236 | goto fail; |
| 1237 | } |
| 1238 | return nx; |
| 1239 | |
| 1240 | fail: |
| 1241 | for (nx--; nx>=0; nx--) |
| 1242 | xfrm_state_put(xfrm[nx]); |
| 1243 | return error; |
| 1244 | } |
| 1245 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1246 | static int |
| 1247 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, |
| 1248 | struct xfrm_state **xfrm, |
| 1249 | unsigned short family) |
| 1250 | { |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1251 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
| 1252 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1253 | int cnx = 0; |
| 1254 | int error; |
| 1255 | int ret; |
| 1256 | int i; |
| 1257 | |
| 1258 | for (i = 0; i < npols; i++) { |
| 1259 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { |
| 1260 | error = -ENOBUFS; |
| 1261 | goto fail; |
| 1262 | } |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1263 | |
| 1264 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1265 | if (ret < 0) { |
| 1266 | error = ret; |
| 1267 | goto fail; |
| 1268 | } else |
| 1269 | cnx += ret; |
| 1270 | } |
| 1271 | |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1272 | /* found states are sorted for outbound processing */ |
| 1273 | if (npols > 1) |
| 1274 | xfrm_state_sort(xfrm, tpp, cnx, family); |
| 1275 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1276 | return cnx; |
| 1277 | |
| 1278 | fail: |
| 1279 | for (cnx--; cnx>=0; cnx--) |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1280 | xfrm_state_put(tpp[cnx]); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1281 | return error; |
| 1282 | |
| 1283 | } |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | /* Check that the bundle accepts the flow and its components are |
| 1286 | * still valid. |
| 1287 | */ |
| 1288 | |
| 1289 | static struct dst_entry * |
| 1290 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) |
| 1291 | { |
| 1292 | struct dst_entry *x; |
| 1293 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1294 | if (unlikely(afinfo == NULL)) |
| 1295 | return ERR_PTR(-EINVAL); |
| 1296 | x = afinfo->find_bundle(fl, policy); |
| 1297 | xfrm_policy_put_afinfo(afinfo); |
| 1298 | return x; |
| 1299 | } |
| 1300 | |
| 1301 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
| 1302 | * all the metrics... Shortly, bundle a bundle. |
| 1303 | */ |
| 1304 | |
| 1305 | static int |
| 1306 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, |
| 1307 | struct flowi *fl, struct dst_entry **dst_p, |
| 1308 | unsigned short family) |
| 1309 | { |
| 1310 | int err; |
| 1311 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1312 | if (unlikely(afinfo == NULL)) |
| 1313 | return -EINVAL; |
| 1314 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); |
| 1315 | xfrm_policy_put_afinfo(afinfo); |
| 1316 | return err; |
| 1317 | } |
| 1318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
| 1320 | static int stale_bundle(struct dst_entry *dst); |
| 1321 | |
| 1322 | /* Main function: finds/creates a bundle for given flow. |
| 1323 | * |
| 1324 | * At the moment we eat a raw IP route. Mostly to speed up lookups |
| 1325 | * on interfaces with disabled IPsec. |
| 1326 | */ |
| 1327 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
| 1328 | struct sock *sk, int flags) |
| 1329 | { |
| 1330 | struct xfrm_policy *policy; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1331 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1332 | int npols; |
| 1333 | int pol_dead; |
| 1334 | int xfrm_nr; |
| 1335 | int pi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
| 1337 | struct dst_entry *dst, *dst_orig = *dst_p; |
| 1338 | int nx = 0; |
| 1339 | int err; |
| 1340 | u32 genid; |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1341 | u16 family; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1342 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | restart: |
| 1345 | genid = atomic_read(&flow_cache_genid); |
| 1346 | policy = NULL; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1347 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
| 1348 | pols[pi] = NULL; |
| 1349 | npols = 0; |
| 1350 | pol_dead = 0; |
| 1351 | xfrm_nr = 0; |
| 1352 | |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1353 | if (sk && sk->sk_policy[1]) { |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1354 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1355 | if (IS_ERR(policy)) |
| 1356 | return PTR_ERR(policy); |
| 1357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | |
| 1359 | if (!policy) { |
| 1360 | /* To accelerate a bit... */ |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1361 | if ((dst_orig->flags & DST_NOXFRM) || |
| 1362 | !xfrm_policy_count[XFRM_POLICY_OUT]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | return 0; |
| 1364 | |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1365 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1366 | dir, xfrm_policy_lookup); |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1367 | if (IS_ERR(policy)) |
| 1368 | return PTR_ERR(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } |
| 1370 | |
| 1371 | if (!policy) |
| 1372 | return 0; |
| 1373 | |
Patrick McHardy | 42cf93c | 2006-02-21 13:37:35 -0800 | [diff] [blame] | 1374 | family = dst_orig->ops->family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | policy->curlft.use_time = (unsigned long)xtime.tv_sec; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1376 | pols[0] = policy; |
| 1377 | npols ++; |
| 1378 | xfrm_nr += pols[0]->xfrm_nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
| 1380 | switch (policy->action) { |
| 1381 | case XFRM_POLICY_BLOCK: |
| 1382 | /* Prohibit the flow */ |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 1383 | err = -EPERM; |
| 1384 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | |
| 1386 | case XFRM_POLICY_ALLOW: |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1387 | #ifndef CONFIG_XFRM_SUB_POLICY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | if (policy->xfrm_nr == 0) { |
| 1389 | /* Flow passes not transformed. */ |
| 1390 | xfrm_pol_put(policy); |
| 1391 | return 0; |
| 1392 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1393 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | |
| 1395 | /* Try to find matching bundle. |
| 1396 | * |
| 1397 | * LATER: help from flow cache. It is optional, this |
| 1398 | * is required only for output policy. |
| 1399 | */ |
| 1400 | dst = xfrm_find_bundle(fl, policy, family); |
| 1401 | if (IS_ERR(dst)) { |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 1402 | err = PTR_ERR(dst); |
| 1403 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | } |
| 1405 | |
| 1406 | if (dst) |
| 1407 | break; |
| 1408 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1409 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1410 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 1411 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, |
| 1412 | fl, family, |
| 1413 | XFRM_POLICY_OUT); |
| 1414 | if (pols[1]) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1415 | if (IS_ERR(pols[1])) { |
| 1416 | err = PTR_ERR(pols[1]); |
| 1417 | goto error; |
| 1418 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1419 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
| 1420 | err = -EPERM; |
| 1421 | goto error; |
| 1422 | } |
| 1423 | npols ++; |
| 1424 | xfrm_nr += pols[1]->xfrm_nr; |
| 1425 | } |
| 1426 | } |
| 1427 | |
| 1428 | /* |
| 1429 | * Because neither flowi nor bundle information knows about |
| 1430 | * transformation template size. On more than one policy usage |
| 1431 | * we can realize whether all of them is bypass or not after |
| 1432 | * they are searched. See above not-transformed bypass |
| 1433 | * is surrounded by non-sub policy configuration, too. |
| 1434 | */ |
| 1435 | if (xfrm_nr == 0) { |
| 1436 | /* Flow passes not transformed. */ |
| 1437 | xfrm_pols_put(pols, npols); |
| 1438 | return 0; |
| 1439 | } |
| 1440 | |
| 1441 | #endif |
| 1442 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | |
| 1444 | if (unlikely(nx<0)) { |
| 1445 | err = nx; |
| 1446 | if (err == -EAGAIN && flags) { |
| 1447 | DECLARE_WAITQUEUE(wait, current); |
| 1448 | |
| 1449 | add_wait_queue(&km_waitq, &wait); |
| 1450 | set_current_state(TASK_INTERRUPTIBLE); |
| 1451 | schedule(); |
| 1452 | set_current_state(TASK_RUNNING); |
| 1453 | remove_wait_queue(&km_waitq, &wait); |
| 1454 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1455 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | |
| 1457 | if (nx == -EAGAIN && signal_pending(current)) { |
| 1458 | err = -ERESTART; |
| 1459 | goto error; |
| 1460 | } |
| 1461 | if (nx == -EAGAIN || |
| 1462 | genid != atomic_read(&flow_cache_genid)) { |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1463 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | goto restart; |
| 1465 | } |
| 1466 | err = nx; |
| 1467 | } |
| 1468 | if (err < 0) |
| 1469 | goto error; |
| 1470 | } |
| 1471 | if (nx == 0) { |
| 1472 | /* Flow passes not transformed. */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1473 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | return 0; |
| 1475 | } |
| 1476 | |
| 1477 | dst = dst_orig; |
| 1478 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); |
| 1479 | |
| 1480 | if (unlikely(err)) { |
| 1481 | int i; |
| 1482 | for (i=0; i<nx; i++) |
| 1483 | xfrm_state_put(xfrm[i]); |
| 1484 | goto error; |
| 1485 | } |
| 1486 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1487 | for (pi = 0; pi < npols; pi++) { |
| 1488 | read_lock_bh(&pols[pi]->lock); |
| 1489 | pol_dead |= pols[pi]->dead; |
| 1490 | read_unlock_bh(&pols[pi]->lock); |
| 1491 | } |
| 1492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | write_lock_bh(&policy->lock); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1494 | if (unlikely(pol_dead || stale_bundle(dst))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | /* Wow! While we worked on resolving, this |
| 1496 | * policy has gone. Retry. It is not paranoia, |
| 1497 | * we just cannot enlist new bundle to dead object. |
| 1498 | * We can't enlist stable bundles either. |
| 1499 | */ |
| 1500 | write_unlock_bh(&policy->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | if (dst) |
| 1502 | dst_free(dst); |
Herbert Xu | 00de651 | 2006-02-13 16:01:27 -0800 | [diff] [blame] | 1503 | |
| 1504 | err = -EHOSTUNREACH; |
| 1505 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | } |
| 1507 | dst->next = policy->bundles; |
| 1508 | policy->bundles = dst; |
| 1509 | dst_hold(dst); |
| 1510 | write_unlock_bh(&policy->lock); |
| 1511 | } |
| 1512 | *dst_p = dst; |
| 1513 | dst_release(dst_orig); |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1514 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | return 0; |
| 1516 | |
| 1517 | error: |
| 1518 | dst_release(dst_orig); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1519 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | *dst_p = NULL; |
| 1521 | return err; |
| 1522 | } |
| 1523 | EXPORT_SYMBOL(xfrm_lookup); |
| 1524 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1525 | static inline int |
| 1526 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) |
| 1527 | { |
| 1528 | struct xfrm_state *x; |
| 1529 | int err; |
| 1530 | |
| 1531 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) |
| 1532 | return 0; |
| 1533 | x = skb->sp->xvec[idx]; |
| 1534 | if (!x->type->reject) |
| 1535 | return 0; |
| 1536 | xfrm_state_hold(x); |
| 1537 | err = x->type->reject(x, skb, fl); |
| 1538 | xfrm_state_put(x); |
| 1539 | return err; |
| 1540 | } |
| 1541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | /* When skb is transformed back to its "native" form, we have to |
| 1543 | * check policy restrictions. At the moment we make this in maximally |
| 1544 | * stupid way. Shame on me. :-) Of course, connected sockets must |
| 1545 | * have policy cached at them. |
| 1546 | */ |
| 1547 | |
| 1548 | static inline int |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1549 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | unsigned short family) |
| 1551 | { |
| 1552 | if (xfrm_state_kern(x)) |
| 1553 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family); |
| 1554 | return x->id.proto == tmpl->id.proto && |
| 1555 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && |
| 1556 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && |
| 1557 | x->props.mode == tmpl->mode && |
Masahide NAKAMURA | f3bd484 | 2006-08-23 18:00:48 -0700 | [diff] [blame] | 1558 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
| 1559 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 1560 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
| 1561 | xfrm_state_addr_cmp(tmpl, x, family)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | } |
| 1563 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1564 | /* |
| 1565 | * 0 or more than 0 is returned when validation is succeeded (either bypass |
| 1566 | * because of optional transport mode, or next index of the mathced secpath |
| 1567 | * state with the template. |
| 1568 | * -1 is returned when no matching template is found. |
| 1569 | * Otherwise "-2 - errored_index" is returned. |
| 1570 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | static inline int |
| 1572 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, |
| 1573 | unsigned short family) |
| 1574 | { |
| 1575 | int idx = start; |
| 1576 | |
| 1577 | if (tmpl->optional) { |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 1578 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | return start; |
| 1580 | } else |
| 1581 | start = -1; |
| 1582 | for (; idx < sp->len; idx++) { |
Herbert Xu | dbe5b4a | 2006-04-01 00:54:16 -0800 | [diff] [blame] | 1583 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | return ++idx; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1585 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1586 | if (start == -1) |
| 1587 | start = -2-idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | break; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1589 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | } |
| 1591 | return start; |
| 1592 | } |
| 1593 | |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 1594 | int |
| 1595 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | { |
| 1597 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1598 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
| 1600 | if (unlikely(afinfo == NULL)) |
| 1601 | return -EAFNOSUPPORT; |
| 1602 | |
| 1603 | afinfo->decode_session(skb, fl); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1604 | err = security_xfrm_decode_session(skb, &fl->secid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | xfrm_policy_put_afinfo(afinfo); |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1606 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | } |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 1608 | EXPORT_SYMBOL(xfrm_decode_session); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1610 | 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] | 1611 | { |
| 1612 | for (; k < sp->len; k++) { |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1613 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1614 | *idxp = k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | return 1; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | } |
| 1618 | |
| 1619 | return 0; |
| 1620 | } |
| 1621 | |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 1622 | 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] | 1623 | unsigned short family) |
| 1624 | { |
| 1625 | struct xfrm_policy *pol; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1626 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1627 | int npols = 0; |
| 1628 | int xfrm_nr; |
| 1629 | int pi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | struct flowi fl; |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 1631 | u8 fl_dir = policy_to_flow_dir(dir); |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1632 | int xerr_idx = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 1634 | if (xfrm_decode_session(skb, &fl, family) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | return 0; |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 1636 | nf_nat_decode_session(skb, &fl, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | |
| 1638 | /* First, check used SA against their selectors. */ |
| 1639 | if (skb->sp) { |
| 1640 | int i; |
| 1641 | |
| 1642 | for (i=skb->sp->len-1; i>=0; i--) { |
Herbert Xu | dbe5b4a | 2006-04-01 00:54:16 -0800 | [diff] [blame] | 1643 | struct xfrm_state *x = skb->sp->xvec[i]; |
| 1644 | if (!xfrm_selector_match(&x->sel, &fl, family)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | pol = NULL; |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1650 | if (sk && sk->sk_policy[dir]) { |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1651 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
Venkat Yekkirala | 3bccfbc | 2006-10-05 15:42:35 -0500 | [diff] [blame] | 1652 | if (IS_ERR(pol)) |
| 1653 | return 0; |
| 1654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
| 1656 | if (!pol) |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1657 | pol = flow_cache_lookup(&fl, family, fl_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | xfrm_policy_lookup); |
| 1659 | |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1660 | if (IS_ERR(pol)) |
| 1661 | return 0; |
| 1662 | |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1663 | if (!pol) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1664 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1665 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
| 1666 | return 0; |
| 1667 | } |
| 1668 | return 1; |
| 1669 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | |
| 1671 | pol->curlft.use_time = (unsigned long)xtime.tv_sec; |
| 1672 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1673 | pols[0] = pol; |
| 1674 | npols ++; |
| 1675 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1676 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 1677 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, |
| 1678 | &fl, family, |
| 1679 | XFRM_POLICY_IN); |
| 1680 | if (pols[1]) { |
James Morris | 134b0fc | 2006-10-05 15:42:27 -0500 | [diff] [blame] | 1681 | if (IS_ERR(pols[1])) |
| 1682 | return 0; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1683 | pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec; |
| 1684 | npols ++; |
| 1685 | } |
| 1686 | } |
| 1687 | #endif |
| 1688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | if (pol->action == XFRM_POLICY_ALLOW) { |
| 1690 | struct sec_path *sp; |
| 1691 | static struct sec_path dummy; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1692 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1693 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1694 | struct xfrm_tmpl **tpp = tp; |
| 1695 | int ti = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | int i, k; |
| 1697 | |
| 1698 | if ((sp = skb->sp) == NULL) |
| 1699 | sp = &dummy; |
| 1700 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1701 | for (pi = 0; pi < npols; pi++) { |
| 1702 | if (pols[pi] != pol && |
| 1703 | pols[pi]->action != XFRM_POLICY_ALLOW) |
| 1704 | goto reject; |
| 1705 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) |
| 1706 | goto reject_error; |
| 1707 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
| 1708 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; |
| 1709 | } |
| 1710 | xfrm_nr = ti; |
Masahide NAKAMURA | 41a49cc | 2006-08-23 22:48:31 -0700 | [diff] [blame] | 1711 | if (npols > 1) { |
| 1712 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); |
| 1713 | tpp = stp; |
| 1714 | } |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | /* For each tunnel xfrm, find the first matching tmpl. |
| 1717 | * For each tmpl before that, find corresponding xfrm. |
| 1718 | * Order is _important_. Later we will implement |
| 1719 | * some barriers, but at the moment barriers |
| 1720 | * are implied between each two transformations. |
| 1721 | */ |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1722 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
| 1723 | k = xfrm_policy_ok(tpp[i], sp, k, family); |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1724 | if (k < 0) { |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1725 | if (k < -1) |
| 1726 | /* "-2 - errored_index" returned */ |
| 1727 | xerr_idx = -(2+k); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | goto reject; |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1729 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | } |
| 1731 | |
James Morris | d1d9fac | 2006-09-01 00:32:12 -0700 | [diff] [blame] | 1732 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | goto reject; |
| 1734 | |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1735 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | return 1; |
| 1737 | } |
| 1738 | |
| 1739 | reject: |
Masahide NAKAMURA | df0ba92 | 2006-08-23 20:41:00 -0700 | [diff] [blame] | 1740 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1741 | reject_error: |
| 1742 | xfrm_pols_put(pols, npols); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | return 0; |
| 1744 | } |
| 1745 | EXPORT_SYMBOL(__xfrm_policy_check); |
| 1746 | |
| 1747 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) |
| 1748 | { |
| 1749 | struct flowi fl; |
| 1750 | |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 1751 | if (xfrm_decode_session(skb, &fl, family) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | return 0; |
| 1753 | |
| 1754 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; |
| 1755 | } |
| 1756 | EXPORT_SYMBOL(__xfrm_route_forward); |
| 1757 | |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 1758 | /* Optimize later using cookies and generation ids. */ |
| 1759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
| 1761 | { |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 1762 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
| 1763 | * to "-1" to force all XFRM destinations to get validated by |
| 1764 | * dst_ops->check on every use. We do this because when a |
| 1765 | * normal route referenced by an XFRM dst is obsoleted we do |
| 1766 | * not go looking around for all parent referencing XFRM dsts |
| 1767 | * so that we can invalidate them. It is just too much work. |
| 1768 | * Instead we make the checks here on every use. For example: |
| 1769 | * |
| 1770 | * XFRM dst A --> IPv4 dst X |
| 1771 | * |
| 1772 | * X is the "xdst->route" of A (X is also the "dst->path" of A |
| 1773 | * in this example). If X is marked obsolete, "A" will not |
| 1774 | * notice. That's what we are validating here via the |
| 1775 | * stale_bundle() check. |
| 1776 | * |
| 1777 | * When a policy's bundle is pruned, we dst_free() the XFRM |
| 1778 | * dst which causes it's ->obsolete field to be set to a |
| 1779 | * positive non-zero integer. If an XFRM dst has been pruned |
| 1780 | * like this, we want to force a new route lookup. |
David S. Miller | 399c180 | 2005-12-19 14:23:23 -0800 | [diff] [blame] | 1781 | */ |
David S. Miller | d49c73c | 2006-08-13 18:55:53 -0700 | [diff] [blame] | 1782 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
| 1783 | return dst; |
| 1784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | return NULL; |
| 1786 | } |
| 1787 | |
| 1788 | static int stale_bundle(struct dst_entry *dst) |
| 1789 | { |
Venkat Yekkirala | 5b368e6 | 2006-10-05 15:42:18 -0500 | [diff] [blame] | 1790 | 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] | 1791 | } |
| 1792 | |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 1793 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
| 1796 | dst->dev = &loopback_dev; |
| 1797 | dev_hold(&loopback_dev); |
| 1798 | dev_put(dev); |
| 1799 | } |
| 1800 | } |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 1801 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | |
| 1803 | static void xfrm_link_failure(struct sk_buff *skb) |
| 1804 | { |
| 1805 | /* Impossible. Such dst must be popped before reaches point of failure. */ |
| 1806 | return; |
| 1807 | } |
| 1808 | |
| 1809 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) |
| 1810 | { |
| 1811 | if (dst) { |
| 1812 | if (dst->obsolete) { |
| 1813 | dst_release(dst); |
| 1814 | dst = NULL; |
| 1815 | } |
| 1816 | } |
| 1817 | return dst; |
| 1818 | } |
| 1819 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1820 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
| 1821 | { |
| 1822 | struct dst_entry *dst, **dstp; |
| 1823 | |
| 1824 | write_lock(&pol->lock); |
| 1825 | dstp = &pol->bundles; |
| 1826 | while ((dst=*dstp) != NULL) { |
| 1827 | if (func(dst)) { |
| 1828 | *dstp = dst->next; |
| 1829 | dst->next = *gc_list_p; |
| 1830 | *gc_list_p = dst; |
| 1831 | } else { |
| 1832 | dstp = &dst->next; |
| 1833 | } |
| 1834 | } |
| 1835 | write_unlock(&pol->lock); |
| 1836 | } |
| 1837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
| 1839 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1840 | struct dst_entry *gc_list = NULL; |
| 1841 | int dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
| 1843 | read_lock_bh(&xfrm_policy_lock); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1844 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 1845 | struct xfrm_policy *pol; |
| 1846 | struct hlist_node *entry; |
| 1847 | struct hlist_head *table; |
| 1848 | int i; |
Masahide NAKAMURA | 4e81bb8 | 2006-08-23 22:43:30 -0700 | [diff] [blame] | 1849 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1850 | hlist_for_each_entry(pol, entry, |
| 1851 | &xfrm_policy_inexact[dir], bydst) |
| 1852 | prune_one_bundle(pol, func, &gc_list); |
| 1853 | |
| 1854 | table = xfrm_policy_bydst[dir].table; |
| 1855 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
| 1856 | hlist_for_each_entry(pol, entry, table + i, bydst) |
| 1857 | prune_one_bundle(pol, func, &gc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | } |
| 1859 | } |
| 1860 | read_unlock_bh(&xfrm_policy_lock); |
| 1861 | |
| 1862 | while (gc_list) { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 1863 | struct dst_entry *dst = gc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | gc_list = dst->next; |
| 1865 | dst_free(dst); |
| 1866 | } |
| 1867 | } |
| 1868 | |
| 1869 | static int unused_bundle(struct dst_entry *dst) |
| 1870 | { |
| 1871 | return !atomic_read(&dst->__refcnt); |
| 1872 | } |
| 1873 | |
| 1874 | static void __xfrm_garbage_collect(void) |
| 1875 | { |
| 1876 | xfrm_prune_bundles(unused_bundle); |
| 1877 | } |
| 1878 | |
David S. Miller | 1c09539 | 2006-08-24 03:30:28 -0700 | [diff] [blame] | 1879 | static int xfrm_flush_bundles(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | { |
| 1881 | xfrm_prune_bundles(stale_bundle); |
| 1882 | return 0; |
| 1883 | } |
| 1884 | |
| 1885 | void xfrm_init_pmtu(struct dst_entry *dst) |
| 1886 | { |
| 1887 | do { |
| 1888 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1889 | u32 pmtu, route_mtu_cached; |
| 1890 | |
| 1891 | pmtu = dst_mtu(dst->child); |
| 1892 | xdst->child_mtu_cached = pmtu; |
| 1893 | |
| 1894 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); |
| 1895 | |
| 1896 | route_mtu_cached = dst_mtu(xdst->route); |
| 1897 | xdst->route_mtu_cached = route_mtu_cached; |
| 1898 | |
| 1899 | if (pmtu > route_mtu_cached) |
| 1900 | pmtu = route_mtu_cached; |
| 1901 | |
| 1902 | dst->metrics[RTAX_MTU-1] = pmtu; |
| 1903 | } while ((dst = dst->next)); |
| 1904 | } |
| 1905 | |
| 1906 | EXPORT_SYMBOL(xfrm_init_pmtu); |
| 1907 | |
| 1908 | /* Check that the bundle accepts the flow and its components are |
| 1909 | * still valid. |
| 1910 | */ |
| 1911 | |
Venkat Yekkirala | 5b368e6 | 2006-10-05 15:42:18 -0500 | [diff] [blame] | 1912 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
| 1913 | struct flowi *fl, int family, int strict) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | { |
| 1915 | struct dst_entry *dst = &first->u.dst; |
| 1916 | struct xfrm_dst *last; |
| 1917 | u32 mtu; |
| 1918 | |
Hideaki YOSHIFUJI | 92d63dec | 2005-05-26 12:58:04 -0700 | [diff] [blame] | 1919 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | (dst->dev && !netif_running(dst->dev))) |
| 1921 | return 0; |
| 1922 | |
| 1923 | last = NULL; |
| 1924 | |
| 1925 | do { |
| 1926 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1927 | |
| 1928 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) |
| 1929 | return 0; |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 1930 | if (fl && pol && |
| 1931 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 1932 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
| 1934 | return 0; |
David S. Miller | 9d4a706 | 2006-08-24 03:18:09 -0700 | [diff] [blame] | 1935 | if (xdst->genid != dst->xfrm->genid) |
| 1936 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | |
Masahide NAKAMURA | e53820d | 2006-08-23 19:12:01 -0700 | [diff] [blame] | 1938 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && |
| 1939 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
| 1940 | return 0; |
| 1941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | mtu = dst_mtu(dst->child); |
| 1943 | if (xdst->child_mtu_cached != mtu) { |
| 1944 | last = xdst; |
| 1945 | xdst->child_mtu_cached = mtu; |
| 1946 | } |
| 1947 | |
Hideaki YOSHIFUJI | 92d63dec | 2005-05-26 12:58:04 -0700 | [diff] [blame] | 1948 | if (!dst_check(xdst->route, xdst->route_cookie)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | return 0; |
| 1950 | mtu = dst_mtu(xdst->route); |
| 1951 | if (xdst->route_mtu_cached != mtu) { |
| 1952 | last = xdst; |
| 1953 | xdst->route_mtu_cached = mtu; |
| 1954 | } |
| 1955 | |
| 1956 | dst = dst->child; |
| 1957 | } while (dst->xfrm); |
| 1958 | |
| 1959 | if (likely(!last)) |
| 1960 | return 1; |
| 1961 | |
| 1962 | mtu = last->child_mtu_cached; |
| 1963 | for (;;) { |
| 1964 | dst = &last->u.dst; |
| 1965 | |
| 1966 | mtu = xfrm_state_mtu(dst->xfrm, mtu); |
| 1967 | if (mtu > last->route_mtu_cached) |
| 1968 | mtu = last->route_mtu_cached; |
| 1969 | dst->metrics[RTAX_MTU-1] = mtu; |
| 1970 | |
| 1971 | if (last == first) |
| 1972 | break; |
| 1973 | |
| 1974 | last = last->u.next; |
| 1975 | last->child_mtu_cached = mtu; |
| 1976 | } |
| 1977 | |
| 1978 | return 1; |
| 1979 | } |
| 1980 | |
| 1981 | EXPORT_SYMBOL(xfrm_bundle_ok); |
| 1982 | |
Joy Latten | c9204d9 | 2006-11-30 15:50:43 -0600 | [diff] [blame] | 1983 | #ifdef CONFIG_AUDITSYSCALL |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 1984 | /* Audit addition and deletion of SAs and ipsec policy */ |
| 1985 | |
| 1986 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, |
| 1987 | struct xfrm_policy *xp, struct xfrm_state *x) |
| 1988 | { |
| 1989 | |
| 1990 | char *secctx; |
| 1991 | u32 secctx_len; |
| 1992 | struct xfrm_sec_ctx *sctx = NULL; |
| 1993 | struct audit_buffer *audit_buf; |
| 1994 | int family; |
| 1995 | extern int audit_enabled; |
| 1996 | |
| 1997 | if (audit_enabled == 0) |
| 1998 | return; |
| 1999 | |
David S. Miller | 13fcfbb0 | 2007-02-12 13:53:54 -0800 | [diff] [blame^] | 2000 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
| 2001 | type == AUDIT_MAC_IPSEC_DELSA) && !x); |
| 2002 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || |
| 2003 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); |
| 2004 | |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 2005 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
| 2006 | if (audit_buf == NULL) |
David S. Miller | 13fcfbb0 | 2007-02-12 13:53:54 -0800 | [diff] [blame^] | 2007 | return; |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 2008 | |
| 2009 | switch(type) { |
| 2010 | case AUDIT_MAC_IPSEC_ADDSA: |
| 2011 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); |
| 2012 | break; |
| 2013 | case AUDIT_MAC_IPSEC_DELSA: |
| 2014 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); |
| 2015 | break; |
| 2016 | case AUDIT_MAC_IPSEC_ADDSPD: |
| 2017 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); |
| 2018 | break; |
| 2019 | case AUDIT_MAC_IPSEC_DELSPD: |
| 2020 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); |
| 2021 | break; |
| 2022 | default: |
| 2023 | return; |
| 2024 | } |
| 2025 | |
| 2026 | if (sid != 0 && |
| 2027 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) |
| 2028 | audit_log_format(audit_buf, " subj=%s", secctx); |
| 2029 | else |
| 2030 | audit_log_task_context(audit_buf); |
| 2031 | |
| 2032 | if (xp) { |
| 2033 | family = xp->selector.family; |
| 2034 | if (xp->security) |
| 2035 | sctx = xp->security; |
| 2036 | } else { |
| 2037 | family = x->props.family; |
| 2038 | if (x->security) |
| 2039 | sctx = x->security; |
| 2040 | } |
| 2041 | |
| 2042 | if (sctx) |
| 2043 | audit_log_format(audit_buf, |
| 2044 | " sec_alg=%u sec_doi=%u sec_obj=%s", |
| 2045 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); |
| 2046 | |
| 2047 | switch(family) { |
| 2048 | case AF_INET: |
| 2049 | { |
| 2050 | struct in_addr saddr, daddr; |
| 2051 | if (xp) { |
| 2052 | saddr.s_addr = xp->selector.saddr.a4; |
| 2053 | daddr.s_addr = xp->selector.daddr.a4; |
| 2054 | } else { |
| 2055 | saddr.s_addr = x->props.saddr.a4; |
| 2056 | daddr.s_addr = x->id.daddr.a4; |
| 2057 | } |
| 2058 | audit_log_format(audit_buf, |
| 2059 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", |
| 2060 | NIPQUAD(saddr), NIPQUAD(daddr)); |
| 2061 | } |
| 2062 | break; |
| 2063 | case AF_INET6: |
| 2064 | { |
| 2065 | struct in6_addr saddr6, daddr6; |
| 2066 | if (xp) { |
| 2067 | memcpy(&saddr6, xp->selector.saddr.a6, |
| 2068 | sizeof(struct in6_addr)); |
| 2069 | memcpy(&daddr6, xp->selector.daddr.a6, |
| 2070 | sizeof(struct in6_addr)); |
| 2071 | } else { |
| 2072 | memcpy(&saddr6, x->props.saddr.a6, |
| 2073 | sizeof(struct in6_addr)); |
| 2074 | memcpy(&daddr6, x->id.daddr.a6, |
| 2075 | sizeof(struct in6_addr)); |
| 2076 | } |
| 2077 | audit_log_format(audit_buf, |
| 2078 | " src=" NIP6_FMT "dst=" NIP6_FMT, |
| 2079 | NIP6(saddr6), NIP6(daddr6)); |
| 2080 | } |
| 2081 | break; |
| 2082 | } |
| 2083 | |
| 2084 | if (x) |
| 2085 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", |
| 2086 | (unsigned long)ntohl(x->id.spi), |
| 2087 | (unsigned long)ntohl(x->id.spi), |
| 2088 | x->id.proto == IPPROTO_AH ? "AH" : |
| 2089 | (x->id.proto == IPPROTO_ESP ? |
| 2090 | "ESP" : "IPCOMP")); |
| 2091 | |
| 2092 | audit_log_format(audit_buf, " res=%u", result); |
| 2093 | audit_log_end(audit_buf); |
| 2094 | } |
| 2095 | |
| 2096 | EXPORT_SYMBOL(xfrm_audit_log); |
Joy Latten | c9204d9 | 2006-11-30 15:50:43 -0600 | [diff] [blame] | 2097 | #endif /* CONFIG_AUDITSYSCALL */ |
Joy Latten | 161a09e | 2006-11-27 13:11:54 -0600 | [diff] [blame] | 2098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2100 | { |
| 2101 | int err = 0; |
| 2102 | if (unlikely(afinfo == NULL)) |
| 2103 | return -EINVAL; |
| 2104 | if (unlikely(afinfo->family >= NPROTO)) |
| 2105 | return -EAFNOSUPPORT; |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2106 | write_lock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
| 2108 | err = -ENOBUFS; |
| 2109 | else { |
| 2110 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2111 | if (likely(dst_ops->kmem_cachep == NULL)) |
| 2112 | dst_ops->kmem_cachep = xfrm_dst_cache; |
| 2113 | if (likely(dst_ops->check == NULL)) |
| 2114 | dst_ops->check = xfrm_dst_check; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | if (likely(dst_ops->negative_advice == NULL)) |
| 2116 | dst_ops->negative_advice = xfrm_negative_advice; |
| 2117 | if (likely(dst_ops->link_failure == NULL)) |
| 2118 | dst_ops->link_failure = xfrm_link_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | if (likely(afinfo->garbage_collect == NULL)) |
| 2120 | afinfo->garbage_collect = __xfrm_garbage_collect; |
| 2121 | xfrm_policy_afinfo[afinfo->family] = afinfo; |
| 2122 | } |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2123 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | return err; |
| 2125 | } |
| 2126 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); |
| 2127 | |
| 2128 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2129 | { |
| 2130 | int err = 0; |
| 2131 | if (unlikely(afinfo == NULL)) |
| 2132 | return -EINVAL; |
| 2133 | if (unlikely(afinfo->family >= NPROTO)) |
| 2134 | return -EAFNOSUPPORT; |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2135 | write_lock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
| 2137 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) |
| 2138 | err = -EINVAL; |
| 2139 | else { |
| 2140 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2141 | xfrm_policy_afinfo[afinfo->family] = NULL; |
| 2142 | dst_ops->kmem_cachep = NULL; |
| 2143 | dst_ops->check = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | dst_ops->negative_advice = NULL; |
| 2145 | dst_ops->link_failure = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | afinfo->garbage_collect = NULL; |
| 2147 | } |
| 2148 | } |
Ingo Molnar | e959d81 | 2006-04-28 15:32:29 -0700 | [diff] [blame] | 2149 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | return err; |
| 2151 | } |
| 2152 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); |
| 2153 | |
| 2154 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
| 2155 | { |
| 2156 | struct xfrm_policy_afinfo *afinfo; |
| 2157 | if (unlikely(family >= NPROTO)) |
| 2158 | return NULL; |
| 2159 | read_lock(&xfrm_policy_afinfo_lock); |
| 2160 | afinfo = xfrm_policy_afinfo[family]; |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 2161 | if (unlikely(!afinfo)) |
| 2162 | read_unlock(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | return afinfo; |
| 2164 | } |
| 2165 | |
| 2166 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2167 | { |
Herbert Xu | 546be24 | 2006-05-27 23:03:58 -0700 | [diff] [blame] | 2168 | read_unlock(&xfrm_policy_afinfo_lock); |
| 2169 | } |
| 2170 | |
| 2171 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) |
| 2172 | { |
| 2173 | struct xfrm_policy_afinfo *afinfo; |
| 2174 | if (unlikely(family >= NPROTO)) |
| 2175 | return NULL; |
| 2176 | write_lock_bh(&xfrm_policy_afinfo_lock); |
| 2177 | afinfo = xfrm_policy_afinfo[family]; |
| 2178 | if (unlikely(!afinfo)) |
| 2179 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
| 2180 | return afinfo; |
| 2181 | } |
| 2182 | |
| 2183 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2184 | { |
| 2185 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | } |
| 2187 | |
| 2188 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 2189 | { |
| 2190 | switch (event) { |
| 2191 | case NETDEV_DOWN: |
| 2192 | xfrm_flush_bundles(); |
| 2193 | } |
| 2194 | return NOTIFY_DONE; |
| 2195 | } |
| 2196 | |
| 2197 | static struct notifier_block xfrm_dev_notifier = { |
| 2198 | xfrm_dev_event, |
| 2199 | NULL, |
| 2200 | 0 |
| 2201 | }; |
| 2202 | |
| 2203 | static void __init xfrm_policy_init(void) |
| 2204 | { |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2205 | unsigned int hmask, sz; |
| 2206 | int dir; |
| 2207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
| 2209 | sizeof(struct xfrm_dst), |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 2210 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2213 | hmask = 8 - 1; |
| 2214 | sz = (hmask+1) * sizeof(struct hlist_head); |
| 2215 | |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 2216 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2217 | xfrm_idx_hmask = hmask; |
| 2218 | if (!xfrm_policy_byidx) |
| 2219 | panic("XFRM: failed to allocate byidx hash\n"); |
| 2220 | |
| 2221 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 2222 | struct xfrm_policy_hash *htab; |
| 2223 | |
| 2224 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); |
| 2225 | |
| 2226 | htab = &xfrm_policy_bydst[dir]; |
David S. Miller | 44e36b4 | 2006-08-24 04:50:50 -0700 | [diff] [blame] | 2227 | htab->table = xfrm_hash_alloc(sz); |
David S. Miller | 2518c7c | 2006-08-24 04:45:07 -0700 | [diff] [blame] | 2228 | htab->hmask = hmask; |
| 2229 | if (!htab->table) |
| 2230 | panic("XFRM: failed to allocate bydst hash\n"); |
| 2231 | } |
| 2232 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2233 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | register_netdevice_notifier(&xfrm_dev_notifier); |
| 2235 | } |
| 2236 | |
| 2237 | void __init xfrm_init(void) |
| 2238 | { |
| 2239 | xfrm_state_init(); |
| 2240 | xfrm_policy_init(); |
| 2241 | xfrm_input_init(); |
| 2242 | } |
| 2243 | |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2244 | #ifdef CONFIG_XFRM_MIGRATE |
| 2245 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, |
| 2246 | struct xfrm_selector *sel_tgt) |
| 2247 | { |
| 2248 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { |
| 2249 | if (sel_tgt->family == sel_cmp->family && |
| 2250 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, |
YOSHIFUJI Hideaki | a716c11 | 2007-02-09 23:25:29 +0900 | [diff] [blame] | 2251 | sel_cmp->family) == 0 && |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2252 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
| 2253 | sel_cmp->family) == 0 && |
| 2254 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
| 2255 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { |
| 2256 | return 1; |
| 2257 | } |
| 2258 | } else { |
| 2259 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { |
| 2260 | return 1; |
| 2261 | } |
| 2262 | } |
| 2263 | return 0; |
| 2264 | } |
| 2265 | |
| 2266 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, |
| 2267 | u8 dir, u8 type) |
| 2268 | { |
| 2269 | struct xfrm_policy *pol, *ret = NULL; |
| 2270 | struct hlist_node *entry; |
| 2271 | struct hlist_head *chain; |
| 2272 | u32 priority = ~0U; |
| 2273 | |
| 2274 | read_lock_bh(&xfrm_policy_lock); |
| 2275 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); |
| 2276 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2277 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2278 | pol->type == type) { |
| 2279 | ret = pol; |
| 2280 | priority = ret->priority; |
| 2281 | break; |
| 2282 | } |
| 2283 | } |
| 2284 | chain = &xfrm_policy_inexact[dir]; |
| 2285 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2286 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2287 | pol->type == type && |
| 2288 | pol->priority < priority) { |
| 2289 | ret = pol; |
| 2290 | break; |
| 2291 | } |
| 2292 | } |
| 2293 | |
| 2294 | if (ret) |
| 2295 | xfrm_pol_hold(ret); |
| 2296 | |
| 2297 | read_unlock_bh(&xfrm_policy_lock); |
| 2298 | |
| 2299 | return ret; |
| 2300 | } |
| 2301 | |
| 2302 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) |
| 2303 | { |
| 2304 | int match = 0; |
| 2305 | |
| 2306 | if (t->mode == m->mode && t->id.proto == m->proto && |
| 2307 | (m->reqid == 0 || t->reqid == m->reqid)) { |
| 2308 | switch (t->mode) { |
| 2309 | case XFRM_MODE_TUNNEL: |
| 2310 | case XFRM_MODE_BEET: |
| 2311 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, |
| 2312 | m->old_family) == 0 && |
| 2313 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, |
| 2314 | m->old_family) == 0) { |
| 2315 | match = 1; |
| 2316 | } |
| 2317 | break; |
| 2318 | case XFRM_MODE_TRANSPORT: |
| 2319 | /* in case of transport mode, template does not store |
| 2320 | any IP addresses, hence we just compare mode and |
| 2321 | protocol */ |
| 2322 | match = 1; |
| 2323 | break; |
| 2324 | default: |
| 2325 | break; |
| 2326 | } |
| 2327 | } |
| 2328 | return match; |
| 2329 | } |
| 2330 | |
| 2331 | /* update endpoint address(es) of template(s) */ |
| 2332 | static int xfrm_policy_migrate(struct xfrm_policy *pol, |
| 2333 | struct xfrm_migrate *m, int num_migrate) |
| 2334 | { |
| 2335 | struct xfrm_migrate *mp; |
| 2336 | struct dst_entry *dst; |
| 2337 | int i, j, n = 0; |
| 2338 | |
| 2339 | write_lock_bh(&pol->lock); |
| 2340 | if (unlikely(pol->dead)) { |
| 2341 | /* target policy has been deleted */ |
| 2342 | write_unlock_bh(&pol->lock); |
| 2343 | return -ENOENT; |
| 2344 | } |
| 2345 | |
| 2346 | for (i = 0; i < pol->xfrm_nr; i++) { |
| 2347 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { |
| 2348 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) |
| 2349 | continue; |
| 2350 | n++; |
| 2351 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) |
| 2352 | continue; |
| 2353 | /* update endpoints */ |
| 2354 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, |
| 2355 | sizeof(pol->xfrm_vec[i].id.daddr)); |
| 2356 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, |
| 2357 | sizeof(pol->xfrm_vec[i].saddr)); |
| 2358 | pol->xfrm_vec[i].encap_family = mp->new_family; |
| 2359 | /* flush bundles */ |
| 2360 | while ((dst = pol->bundles) != NULL) { |
| 2361 | pol->bundles = dst->next; |
| 2362 | dst_free(dst); |
| 2363 | } |
| 2364 | } |
| 2365 | } |
| 2366 | |
| 2367 | write_unlock_bh(&pol->lock); |
| 2368 | |
| 2369 | if (!n) |
| 2370 | return -ENODATA; |
| 2371 | |
| 2372 | return 0; |
| 2373 | } |
| 2374 | |
| 2375 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) |
| 2376 | { |
| 2377 | int i, j; |
| 2378 | |
| 2379 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) |
| 2380 | return -EINVAL; |
| 2381 | |
| 2382 | for (i = 0; i < num_migrate; i++) { |
| 2383 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, |
| 2384 | m[i].old_family) == 0) && |
| 2385 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, |
| 2386 | m[i].old_family) == 0)) |
| 2387 | return -EINVAL; |
| 2388 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || |
| 2389 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) |
| 2390 | return -EINVAL; |
| 2391 | |
| 2392 | /* check if there is any duplicated entry */ |
| 2393 | for (j = i + 1; j < num_migrate; j++) { |
| 2394 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, |
| 2395 | sizeof(m[i].old_daddr)) && |
| 2396 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, |
| 2397 | sizeof(m[i].old_saddr)) && |
| 2398 | m[i].proto == m[j].proto && |
| 2399 | m[i].mode == m[j].mode && |
| 2400 | m[i].reqid == m[j].reqid && |
| 2401 | m[i].old_family == m[j].old_family) |
| 2402 | return -EINVAL; |
| 2403 | } |
| 2404 | } |
| 2405 | |
| 2406 | return 0; |
| 2407 | } |
| 2408 | |
| 2409 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
| 2410 | struct xfrm_migrate *m, int num_migrate) |
| 2411 | { |
| 2412 | int i, err, nx_cur = 0, nx_new = 0; |
| 2413 | struct xfrm_policy *pol = NULL; |
| 2414 | struct xfrm_state *x, *xc; |
| 2415 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; |
| 2416 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; |
| 2417 | struct xfrm_migrate *mp; |
| 2418 | |
| 2419 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) |
| 2420 | goto out; |
| 2421 | |
| 2422 | /* Stage 1 - find policy */ |
| 2423 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { |
| 2424 | err = -ENOENT; |
| 2425 | goto out; |
| 2426 | } |
| 2427 | |
| 2428 | /* Stage 2 - find and update state(s) */ |
| 2429 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { |
| 2430 | if ((x = xfrm_migrate_state_find(mp))) { |
| 2431 | x_cur[nx_cur] = x; |
| 2432 | nx_cur++; |
| 2433 | if ((xc = xfrm_state_migrate(x, mp))) { |
| 2434 | x_new[nx_new] = xc; |
| 2435 | nx_new++; |
| 2436 | } else { |
| 2437 | err = -ENODATA; |
| 2438 | goto restore_state; |
| 2439 | } |
| 2440 | } |
| 2441 | } |
| 2442 | |
| 2443 | /* Stage 3 - update policy */ |
| 2444 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) |
| 2445 | goto restore_state; |
| 2446 | |
| 2447 | /* Stage 4 - delete old state(s) */ |
| 2448 | if (nx_cur) { |
| 2449 | xfrm_states_put(x_cur, nx_cur); |
| 2450 | xfrm_states_delete(x_cur, nx_cur); |
| 2451 | } |
| 2452 | |
| 2453 | /* Stage 5 - announce */ |
| 2454 | km_migrate(sel, dir, type, m, num_migrate); |
| 2455 | |
| 2456 | xfrm_pol_put(pol); |
| 2457 | |
| 2458 | return 0; |
| 2459 | out: |
| 2460 | return err; |
| 2461 | |
| 2462 | restore_state: |
| 2463 | if (pol) |
| 2464 | xfrm_pol_put(pol); |
| 2465 | if (nx_cur) |
| 2466 | xfrm_states_put(x_cur, nx_cur); |
| 2467 | if (nx_new) |
| 2468 | xfrm_states_delete(x_new, nx_new); |
| 2469 | |
| 2470 | return err; |
| 2471 | } |
David S. Miller | e610e67 | 2007-02-08 13:29:15 -0800 | [diff] [blame] | 2472 | EXPORT_SYMBOL(xfrm_migrate); |
Shinta Sugimoto | 80c9aba | 2007-02-08 13:11:42 -0800 | [diff] [blame] | 2473 | #endif |
| 2474 | |