| 1 | /* |
| 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 |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/kmod.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/workqueue.h> |
| 22 | #include <linux/notifier.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/netfilter.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/cache.h> |
| 27 | #include <linux/audit.h> |
| 28 | #include <net/dst.h> |
| 29 | #include <net/xfrm.h> |
| 30 | #include <net/ip.h> |
| 31 | #ifdef CONFIG_XFRM_STATISTICS |
| 32 | #include <net/snmp.h> |
| 33 | #endif |
| 34 | |
| 35 | #include "xfrm_hash.h" |
| 36 | |
| 37 | DEFINE_MUTEX(xfrm_cfg_mutex); |
| 38 | EXPORT_SYMBOL(xfrm_cfg_mutex); |
| 39 | |
| 40 | static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); |
| 41 | static struct dst_entry *xfrm_policy_sk_bundles; |
| 42 | static DEFINE_RWLOCK(xfrm_policy_lock); |
| 43 | |
| 44 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
| 45 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; |
| 46 | |
| 47 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
| 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); |
| 51 | static void xfrm_init_pmtu(struct dst_entry *dst); |
| 52 | static int stale_bundle(struct dst_entry *dst); |
| 53 | |
| 54 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| 55 | int dir); |
| 56 | |
| 57 | static inline int |
| 58 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 59 | { |
| 60 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && |
| 61 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && |
| 62 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 63 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 64 | (fl->proto == sel->proto || !sel->proto) && |
| 65 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 66 | } |
| 67 | |
| 68 | static inline int |
| 69 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| 70 | { |
| 71 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && |
| 72 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && |
| 73 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| 74 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| 75 | (fl->proto == sel->proto || !sel->proto) && |
| 76 | (fl->oif == sel->ifindex || !sel->ifindex); |
| 77 | } |
| 78 | |
| 79 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
| 80 | unsigned short family) |
| 81 | { |
| 82 | switch (family) { |
| 83 | case AF_INET: |
| 84 | return __xfrm4_selector_match(sel, fl); |
| 85 | case AF_INET6: |
| 86 | return __xfrm6_selector_match(sel, fl); |
| 87 | } |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
| 92 | xfrm_address_t *saddr, |
| 93 | xfrm_address_t *daddr, |
| 94 | int family) |
| 95 | { |
| 96 | struct xfrm_policy_afinfo *afinfo; |
| 97 | struct dst_entry *dst; |
| 98 | |
| 99 | afinfo = xfrm_policy_get_afinfo(family); |
| 100 | if (unlikely(afinfo == NULL)) |
| 101 | return ERR_PTR(-EAFNOSUPPORT); |
| 102 | |
| 103 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
| 104 | |
| 105 | xfrm_policy_put_afinfo(afinfo); |
| 106 | |
| 107 | return dst; |
| 108 | } |
| 109 | |
| 110 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
| 111 | xfrm_address_t *prev_saddr, |
| 112 | xfrm_address_t *prev_daddr, |
| 113 | int family) |
| 114 | { |
| 115 | struct net *net = xs_net(x); |
| 116 | xfrm_address_t *saddr = &x->props.saddr; |
| 117 | xfrm_address_t *daddr = &x->id.daddr; |
| 118 | struct dst_entry *dst; |
| 119 | |
| 120 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
| 121 | saddr = x->coaddr; |
| 122 | daddr = prev_daddr; |
| 123 | } |
| 124 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { |
| 125 | saddr = prev_saddr; |
| 126 | daddr = x->coaddr; |
| 127 | } |
| 128 | |
| 129 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
| 130 | |
| 131 | if (!IS_ERR(dst)) { |
| 132 | if (prev_saddr != saddr) |
| 133 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); |
| 134 | if (prev_daddr != daddr) |
| 135 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); |
| 136 | } |
| 137 | |
| 138 | return dst; |
| 139 | } |
| 140 | |
| 141 | static inline unsigned long make_jiffies(long secs) |
| 142 | { |
| 143 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) |
| 144 | return MAX_SCHEDULE_TIMEOUT-1; |
| 145 | else |
| 146 | return secs*HZ; |
| 147 | } |
| 148 | |
| 149 | static void xfrm_policy_timer(unsigned long data) |
| 150 | { |
| 151 | struct xfrm_policy *xp = (struct xfrm_policy*)data; |
| 152 | unsigned long now = get_seconds(); |
| 153 | long next = LONG_MAX; |
| 154 | int warn = 0; |
| 155 | int dir; |
| 156 | |
| 157 | read_lock(&xp->lock); |
| 158 | |
| 159 | if (unlikely(xp->walk.dead)) |
| 160 | goto out; |
| 161 | |
| 162 | dir = xfrm_policy_id2dir(xp->index); |
| 163 | |
| 164 | if (xp->lft.hard_add_expires_seconds) { |
| 165 | long tmo = xp->lft.hard_add_expires_seconds + |
| 166 | xp->curlft.add_time - now; |
| 167 | if (tmo <= 0) |
| 168 | goto expired; |
| 169 | if (tmo < next) |
| 170 | next = tmo; |
| 171 | } |
| 172 | if (xp->lft.hard_use_expires_seconds) { |
| 173 | long tmo = xp->lft.hard_use_expires_seconds + |
| 174 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 175 | if (tmo <= 0) |
| 176 | goto expired; |
| 177 | if (tmo < next) |
| 178 | next = tmo; |
| 179 | } |
| 180 | if (xp->lft.soft_add_expires_seconds) { |
| 181 | long tmo = xp->lft.soft_add_expires_seconds + |
| 182 | xp->curlft.add_time - now; |
| 183 | if (tmo <= 0) { |
| 184 | warn = 1; |
| 185 | tmo = XFRM_KM_TIMEOUT; |
| 186 | } |
| 187 | if (tmo < next) |
| 188 | next = tmo; |
| 189 | } |
| 190 | if (xp->lft.soft_use_expires_seconds) { |
| 191 | long tmo = xp->lft.soft_use_expires_seconds + |
| 192 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; |
| 193 | if (tmo <= 0) { |
| 194 | warn = 1; |
| 195 | tmo = XFRM_KM_TIMEOUT; |
| 196 | } |
| 197 | if (tmo < next) |
| 198 | next = tmo; |
| 199 | } |
| 200 | |
| 201 | if (warn) |
| 202 | km_policy_expired(xp, dir, 0, 0); |
| 203 | if (next != LONG_MAX && |
| 204 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) |
| 205 | xfrm_pol_hold(xp); |
| 206 | |
| 207 | out: |
| 208 | read_unlock(&xp->lock); |
| 209 | xfrm_pol_put(xp); |
| 210 | return; |
| 211 | |
| 212 | expired: |
| 213 | read_unlock(&xp->lock); |
| 214 | if (!xfrm_policy_delete(xp, dir)) |
| 215 | km_policy_expired(xp, dir, 1, 0); |
| 216 | xfrm_pol_put(xp); |
| 217 | } |
| 218 | |
| 219 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
| 220 | { |
| 221 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); |
| 222 | |
| 223 | if (unlikely(pol->walk.dead)) |
| 224 | flo = NULL; |
| 225 | else |
| 226 | xfrm_pol_hold(pol); |
| 227 | |
| 228 | return flo; |
| 229 | } |
| 230 | |
| 231 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) |
| 232 | { |
| 233 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); |
| 234 | |
| 235 | return !pol->walk.dead; |
| 236 | } |
| 237 | |
| 238 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) |
| 239 | { |
| 240 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); |
| 241 | } |
| 242 | |
| 243 | static const struct flow_cache_ops xfrm_policy_fc_ops = { |
| 244 | .get = xfrm_policy_flo_get, |
| 245 | .check = xfrm_policy_flo_check, |
| 246 | .delete = xfrm_policy_flo_delete, |
| 247 | }; |
| 248 | |
| 249 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 |
| 250 | * SPD calls. |
| 251 | */ |
| 252 | |
| 253 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
| 254 | { |
| 255 | struct xfrm_policy *policy; |
| 256 | |
| 257 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
| 258 | |
| 259 | if (policy) { |
| 260 | write_pnet(&policy->xp_net, net); |
| 261 | INIT_LIST_HEAD(&policy->walk.all); |
| 262 | INIT_HLIST_NODE(&policy->bydst); |
| 263 | INIT_HLIST_NODE(&policy->byidx); |
| 264 | rwlock_init(&policy->lock); |
| 265 | atomic_set(&policy->refcnt, 1); |
| 266 | setup_timer(&policy->timer, xfrm_policy_timer, |
| 267 | (unsigned long)policy); |
| 268 | policy->flo.ops = &xfrm_policy_fc_ops; |
| 269 | } |
| 270 | return policy; |
| 271 | } |
| 272 | EXPORT_SYMBOL(xfrm_policy_alloc); |
| 273 | |
| 274 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ |
| 275 | |
| 276 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
| 277 | { |
| 278 | BUG_ON(!policy->walk.dead); |
| 279 | |
| 280 | if (del_timer(&policy->timer)) |
| 281 | BUG(); |
| 282 | |
| 283 | security_xfrm_policy_free(policy->security); |
| 284 | kfree(policy); |
| 285 | } |
| 286 | EXPORT_SYMBOL(xfrm_policy_destroy); |
| 287 | |
| 288 | /* Rule must be locked. Release descentant resources, announce |
| 289 | * entry dead. The rule must be unlinked from lists to the moment. |
| 290 | */ |
| 291 | |
| 292 | static void xfrm_policy_kill(struct xfrm_policy *policy) |
| 293 | { |
| 294 | policy->walk.dead = 1; |
| 295 | |
| 296 | atomic_inc(&policy->genid); |
| 297 | |
| 298 | if (del_timer(&policy->timer)) |
| 299 | xfrm_pol_put(policy); |
| 300 | |
| 301 | xfrm_pol_put(policy); |
| 302 | } |
| 303 | |
| 304 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
| 305 | |
| 306 | static inline unsigned int idx_hash(struct net *net, u32 index) |
| 307 | { |
| 308 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
| 309 | } |
| 310 | |
| 311 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
| 312 | { |
| 313 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| 314 | unsigned int hash = __sel_hash(sel, family, hmask); |
| 315 | |
| 316 | return (hash == hmask + 1 ? |
| 317 | &net->xfrm.policy_inexact[dir] : |
| 318 | net->xfrm.policy_bydst[dir].table + hash); |
| 319 | } |
| 320 | |
| 321 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
| 322 | { |
| 323 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| 324 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
| 325 | |
| 326 | return net->xfrm.policy_bydst[dir].table + hash; |
| 327 | } |
| 328 | |
| 329 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
| 330 | struct hlist_head *ndsttable, |
| 331 | unsigned int nhashmask) |
| 332 | { |
| 333 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
| 334 | struct xfrm_policy *pol; |
| 335 | unsigned int h0 = 0; |
| 336 | |
| 337 | redo: |
| 338 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
| 339 | unsigned int h; |
| 340 | |
| 341 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
| 342 | pol->family, nhashmask); |
| 343 | if (!entry0) { |
| 344 | hlist_del(entry); |
| 345 | hlist_add_head(&pol->bydst, ndsttable+h); |
| 346 | h0 = h; |
| 347 | } else { |
| 348 | if (h != h0) |
| 349 | continue; |
| 350 | hlist_del(entry); |
| 351 | hlist_add_after(entry0, &pol->bydst); |
| 352 | } |
| 353 | entry0 = entry; |
| 354 | } |
| 355 | if (!hlist_empty(list)) { |
| 356 | entry0 = NULL; |
| 357 | goto redo; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | static void xfrm_idx_hash_transfer(struct hlist_head *list, |
| 362 | struct hlist_head *nidxtable, |
| 363 | unsigned int nhashmask) |
| 364 | { |
| 365 | struct hlist_node *entry, *tmp; |
| 366 | struct xfrm_policy *pol; |
| 367 | |
| 368 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { |
| 369 | unsigned int h; |
| 370 | |
| 371 | h = __idx_hash(pol->index, nhashmask); |
| 372 | hlist_add_head(&pol->byidx, nidxtable+h); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) |
| 377 | { |
| 378 | return ((old_hmask + 1) << 1) - 1; |
| 379 | } |
| 380 | |
| 381 | static void xfrm_bydst_resize(struct net *net, int dir) |
| 382 | { |
| 383 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| 384 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 385 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 386 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
| 387 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
| 388 | int i; |
| 389 | |
| 390 | if (!ndst) |
| 391 | return; |
| 392 | |
| 393 | write_lock_bh(&xfrm_policy_lock); |
| 394 | |
| 395 | for (i = hmask; i >= 0; i--) |
| 396 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); |
| 397 | |
| 398 | net->xfrm.policy_bydst[dir].table = ndst; |
| 399 | net->xfrm.policy_bydst[dir].hmask = nhashmask; |
| 400 | |
| 401 | write_unlock_bh(&xfrm_policy_lock); |
| 402 | |
| 403 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
| 404 | } |
| 405 | |
| 406 | static void xfrm_byidx_resize(struct net *net, int total) |
| 407 | { |
| 408 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
| 409 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
| 410 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); |
| 411 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
| 412 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
| 413 | int i; |
| 414 | |
| 415 | if (!nidx) |
| 416 | return; |
| 417 | |
| 418 | write_lock_bh(&xfrm_policy_lock); |
| 419 | |
| 420 | for (i = hmask; i >= 0; i--) |
| 421 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); |
| 422 | |
| 423 | net->xfrm.policy_byidx = nidx; |
| 424 | net->xfrm.policy_idx_hmask = nhashmask; |
| 425 | |
| 426 | write_unlock_bh(&xfrm_policy_lock); |
| 427 | |
| 428 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
| 429 | } |
| 430 | |
| 431 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
| 432 | { |
| 433 | unsigned int cnt = net->xfrm.policy_count[dir]; |
| 434 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| 435 | |
| 436 | if (total) |
| 437 | *total += cnt; |
| 438 | |
| 439 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 440 | cnt > hmask) |
| 441 | return 1; |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
| 447 | { |
| 448 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
| 449 | |
| 450 | if ((hmask + 1) < xfrm_policy_hashmax && |
| 451 | total > hmask) |
| 452 | return 1; |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
| 458 | { |
| 459 | read_lock_bh(&xfrm_policy_lock); |
| 460 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
| 461 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; |
| 462 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; |
| 463 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; |
| 464 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; |
| 465 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; |
| 466 | si->spdhcnt = net->xfrm.policy_idx_hmask; |
| 467 | si->spdhmcnt = xfrm_policy_hashmax; |
| 468 | read_unlock_bh(&xfrm_policy_lock); |
| 469 | } |
| 470 | EXPORT_SYMBOL(xfrm_spd_getinfo); |
| 471 | |
| 472 | static DEFINE_MUTEX(hash_resize_mutex); |
| 473 | static void xfrm_hash_resize(struct work_struct *work) |
| 474 | { |
| 475 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
| 476 | int dir, total; |
| 477 | |
| 478 | mutex_lock(&hash_resize_mutex); |
| 479 | |
| 480 | total = 0; |
| 481 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 482 | if (xfrm_bydst_should_resize(net, dir, &total)) |
| 483 | xfrm_bydst_resize(net, dir); |
| 484 | } |
| 485 | if (xfrm_byidx_should_resize(net, total)) |
| 486 | xfrm_byidx_resize(net, total); |
| 487 | |
| 488 | mutex_unlock(&hash_resize_mutex); |
| 489 | } |
| 490 | |
| 491 | /* Generate new index... KAME seems to generate them ordered by cost |
| 492 | * of an absolute inpredictability of ordering of rules. This will not pass. */ |
| 493 | static u32 xfrm_gen_index(struct net *net, int dir) |
| 494 | { |
| 495 | static u32 idx_generator; |
| 496 | |
| 497 | for (;;) { |
| 498 | struct hlist_node *entry; |
| 499 | struct hlist_head *list; |
| 500 | struct xfrm_policy *p; |
| 501 | u32 idx; |
| 502 | int found; |
| 503 | |
| 504 | idx = (idx_generator | dir); |
| 505 | idx_generator += 8; |
| 506 | if (idx == 0) |
| 507 | idx = 8; |
| 508 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
| 509 | found = 0; |
| 510 | hlist_for_each_entry(p, entry, list, byidx) { |
| 511 | if (p->index == idx) { |
| 512 | found = 1; |
| 513 | break; |
| 514 | } |
| 515 | } |
| 516 | if (!found) |
| 517 | return idx; |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
| 522 | { |
| 523 | u32 *p1 = (u32 *) s1; |
| 524 | u32 *p2 = (u32 *) s2; |
| 525 | int len = sizeof(struct xfrm_selector) / sizeof(u32); |
| 526 | int i; |
| 527 | |
| 528 | for (i = 0; i < len; i++) { |
| 529 | if (p1[i] != p2[i]) |
| 530 | return 1; |
| 531 | } |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
| 537 | { |
| 538 | struct net *net = xp_net(policy); |
| 539 | struct xfrm_policy *pol; |
| 540 | struct xfrm_policy *delpol; |
| 541 | struct hlist_head *chain; |
| 542 | struct hlist_node *entry, *newpos; |
| 543 | u32 mark = policy->mark.v & policy->mark.m; |
| 544 | |
| 545 | write_lock_bh(&xfrm_policy_lock); |
| 546 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
| 547 | delpol = NULL; |
| 548 | newpos = NULL; |
| 549 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 550 | if (pol->type == policy->type && |
| 551 | !selector_cmp(&pol->selector, &policy->selector) && |
| 552 | (mark & pol->mark.m) == pol->mark.v && |
| 553 | xfrm_sec_ctx_match(pol->security, policy->security) && |
| 554 | !WARN_ON(delpol)) { |
| 555 | if (excl) { |
| 556 | write_unlock_bh(&xfrm_policy_lock); |
| 557 | return -EEXIST; |
| 558 | } |
| 559 | delpol = pol; |
| 560 | if (policy->priority > pol->priority) |
| 561 | continue; |
| 562 | } else if (policy->priority >= pol->priority) { |
| 563 | newpos = &pol->bydst; |
| 564 | continue; |
| 565 | } |
| 566 | if (delpol) |
| 567 | break; |
| 568 | } |
| 569 | if (newpos) |
| 570 | hlist_add_after(newpos, &policy->bydst); |
| 571 | else |
| 572 | hlist_add_head(&policy->bydst, chain); |
| 573 | xfrm_pol_hold(policy); |
| 574 | net->xfrm.policy_count[dir]++; |
| 575 | atomic_inc(&flow_cache_genid); |
| 576 | if (delpol) |
| 577 | __xfrm_policy_unlink(delpol, dir); |
| 578 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
| 579 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
| 580 | policy->curlft.add_time = get_seconds(); |
| 581 | policy->curlft.use_time = 0; |
| 582 | if (!mod_timer(&policy->timer, jiffies + HZ)) |
| 583 | xfrm_pol_hold(policy); |
| 584 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
| 585 | write_unlock_bh(&xfrm_policy_lock); |
| 586 | |
| 587 | if (delpol) |
| 588 | xfrm_policy_kill(delpol); |
| 589 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
| 590 | schedule_work(&net->xfrm.policy_hash_work); |
| 591 | |
| 592 | return 0; |
| 593 | } |
| 594 | EXPORT_SYMBOL(xfrm_policy_insert); |
| 595 | |
| 596 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
| 597 | int dir, struct xfrm_selector *sel, |
| 598 | struct xfrm_sec_ctx *ctx, int delete, |
| 599 | int *err) |
| 600 | { |
| 601 | struct xfrm_policy *pol, *ret; |
| 602 | struct hlist_head *chain; |
| 603 | struct hlist_node *entry; |
| 604 | |
| 605 | *err = 0; |
| 606 | write_lock_bh(&xfrm_policy_lock); |
| 607 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
| 608 | ret = NULL; |
| 609 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 610 | if (pol->type == type && |
| 611 | (mark & pol->mark.m) == pol->mark.v && |
| 612 | !selector_cmp(sel, &pol->selector) && |
| 613 | xfrm_sec_ctx_match(ctx, pol->security)) { |
| 614 | xfrm_pol_hold(pol); |
| 615 | if (delete) { |
| 616 | *err = security_xfrm_policy_delete( |
| 617 | pol->security); |
| 618 | if (*err) { |
| 619 | write_unlock_bh(&xfrm_policy_lock); |
| 620 | return pol; |
| 621 | } |
| 622 | __xfrm_policy_unlink(pol, dir); |
| 623 | } |
| 624 | ret = pol; |
| 625 | break; |
| 626 | } |
| 627 | } |
| 628 | write_unlock_bh(&xfrm_policy_lock); |
| 629 | |
| 630 | if (ret && delete) |
| 631 | xfrm_policy_kill(ret); |
| 632 | return ret; |
| 633 | } |
| 634 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
| 635 | |
| 636 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
| 637 | int dir, u32 id, int delete, int *err) |
| 638 | { |
| 639 | struct xfrm_policy *pol, *ret; |
| 640 | struct hlist_head *chain; |
| 641 | struct hlist_node *entry; |
| 642 | |
| 643 | *err = -ENOENT; |
| 644 | if (xfrm_policy_id2dir(id) != dir) |
| 645 | return NULL; |
| 646 | |
| 647 | *err = 0; |
| 648 | write_lock_bh(&xfrm_policy_lock); |
| 649 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
| 650 | ret = NULL; |
| 651 | hlist_for_each_entry(pol, entry, chain, byidx) { |
| 652 | if (pol->type == type && pol->index == id && |
| 653 | (mark & pol->mark.m) == pol->mark.v) { |
| 654 | xfrm_pol_hold(pol); |
| 655 | if (delete) { |
| 656 | *err = security_xfrm_policy_delete( |
| 657 | pol->security); |
| 658 | if (*err) { |
| 659 | write_unlock_bh(&xfrm_policy_lock); |
| 660 | return pol; |
| 661 | } |
| 662 | __xfrm_policy_unlink(pol, dir); |
| 663 | } |
| 664 | ret = pol; |
| 665 | break; |
| 666 | } |
| 667 | } |
| 668 | write_unlock_bh(&xfrm_policy_lock); |
| 669 | |
| 670 | if (ret && delete) |
| 671 | xfrm_policy_kill(ret); |
| 672 | return ret; |
| 673 | } |
| 674 | EXPORT_SYMBOL(xfrm_policy_byid); |
| 675 | |
| 676 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 677 | static inline int |
| 678 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
| 679 | { |
| 680 | int dir, err = 0; |
| 681 | |
| 682 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
| 683 | struct xfrm_policy *pol; |
| 684 | struct hlist_node *entry; |
| 685 | int i; |
| 686 | |
| 687 | hlist_for_each_entry(pol, entry, |
| 688 | &net->xfrm.policy_inexact[dir], bydst) { |
| 689 | if (pol->type != type) |
| 690 | continue; |
| 691 | err = security_xfrm_policy_delete(pol->security); |
| 692 | if (err) { |
| 693 | xfrm_audit_policy_delete(pol, 0, |
| 694 | audit_info->loginuid, |
| 695 | audit_info->sessionid, |
| 696 | audit_info->secid); |
| 697 | return err; |
| 698 | } |
| 699 | } |
| 700 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
| 701 | hlist_for_each_entry(pol, entry, |
| 702 | net->xfrm.policy_bydst[dir].table + i, |
| 703 | bydst) { |
| 704 | if (pol->type != type) |
| 705 | continue; |
| 706 | err = security_xfrm_policy_delete( |
| 707 | pol->security); |
| 708 | if (err) { |
| 709 | xfrm_audit_policy_delete(pol, 0, |
| 710 | audit_info->loginuid, |
| 711 | audit_info->sessionid, |
| 712 | audit_info->secid); |
| 713 | return err; |
| 714 | } |
| 715 | } |
| 716 | } |
| 717 | } |
| 718 | return err; |
| 719 | } |
| 720 | #else |
| 721 | static inline int |
| 722 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
| 723 | { |
| 724 | return 0; |
| 725 | } |
| 726 | #endif |
| 727 | |
| 728 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
| 729 | { |
| 730 | int dir, err = 0, cnt = 0; |
| 731 | |
| 732 | write_lock_bh(&xfrm_policy_lock); |
| 733 | |
| 734 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
| 735 | if (err) |
| 736 | goto out; |
| 737 | |
| 738 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
| 739 | struct xfrm_policy *pol; |
| 740 | struct hlist_node *entry; |
| 741 | int i; |
| 742 | |
| 743 | again1: |
| 744 | hlist_for_each_entry(pol, entry, |
| 745 | &net->xfrm.policy_inexact[dir], bydst) { |
| 746 | if (pol->type != type) |
| 747 | continue; |
| 748 | __xfrm_policy_unlink(pol, dir); |
| 749 | write_unlock_bh(&xfrm_policy_lock); |
| 750 | cnt++; |
| 751 | |
| 752 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
| 753 | audit_info->sessionid, |
| 754 | audit_info->secid); |
| 755 | |
| 756 | xfrm_policy_kill(pol); |
| 757 | |
| 758 | write_lock_bh(&xfrm_policy_lock); |
| 759 | goto again1; |
| 760 | } |
| 761 | |
| 762 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
| 763 | again2: |
| 764 | hlist_for_each_entry(pol, entry, |
| 765 | net->xfrm.policy_bydst[dir].table + i, |
| 766 | bydst) { |
| 767 | if (pol->type != type) |
| 768 | continue; |
| 769 | __xfrm_policy_unlink(pol, dir); |
| 770 | write_unlock_bh(&xfrm_policy_lock); |
| 771 | cnt++; |
| 772 | |
| 773 | xfrm_audit_policy_delete(pol, 1, |
| 774 | audit_info->loginuid, |
| 775 | audit_info->sessionid, |
| 776 | audit_info->secid); |
| 777 | xfrm_policy_kill(pol); |
| 778 | |
| 779 | write_lock_bh(&xfrm_policy_lock); |
| 780 | goto again2; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | } |
| 785 | if (!cnt) |
| 786 | err = -ESRCH; |
| 787 | out: |
| 788 | write_unlock_bh(&xfrm_policy_lock); |
| 789 | return err; |
| 790 | } |
| 791 | EXPORT_SYMBOL(xfrm_policy_flush); |
| 792 | |
| 793 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
| 794 | int (*func)(struct xfrm_policy *, int, int, void*), |
| 795 | void *data) |
| 796 | { |
| 797 | struct xfrm_policy *pol; |
| 798 | struct xfrm_policy_walk_entry *x; |
| 799 | int error = 0; |
| 800 | |
| 801 | if (walk->type >= XFRM_POLICY_TYPE_MAX && |
| 802 | walk->type != XFRM_POLICY_TYPE_ANY) |
| 803 | return -EINVAL; |
| 804 | |
| 805 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
| 806 | return 0; |
| 807 | |
| 808 | write_lock_bh(&xfrm_policy_lock); |
| 809 | if (list_empty(&walk->walk.all)) |
| 810 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
| 811 | else |
| 812 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); |
| 813 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
| 814 | if (x->dead) |
| 815 | continue; |
| 816 | pol = container_of(x, struct xfrm_policy, walk); |
| 817 | if (walk->type != XFRM_POLICY_TYPE_ANY && |
| 818 | walk->type != pol->type) |
| 819 | continue; |
| 820 | error = func(pol, xfrm_policy_id2dir(pol->index), |
| 821 | walk->seq, data); |
| 822 | if (error) { |
| 823 | list_move_tail(&walk->walk.all, &x->all); |
| 824 | goto out; |
| 825 | } |
| 826 | walk->seq++; |
| 827 | } |
| 828 | if (walk->seq == 0) { |
| 829 | error = -ENOENT; |
| 830 | goto out; |
| 831 | } |
| 832 | list_del_init(&walk->walk.all); |
| 833 | out: |
| 834 | write_unlock_bh(&xfrm_policy_lock); |
| 835 | return error; |
| 836 | } |
| 837 | EXPORT_SYMBOL(xfrm_policy_walk); |
| 838 | |
| 839 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
| 840 | { |
| 841 | INIT_LIST_HEAD(&walk->walk.all); |
| 842 | walk->walk.dead = 1; |
| 843 | walk->type = type; |
| 844 | walk->seq = 0; |
| 845 | } |
| 846 | EXPORT_SYMBOL(xfrm_policy_walk_init); |
| 847 | |
| 848 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) |
| 849 | { |
| 850 | if (list_empty(&walk->walk.all)) |
| 851 | return; |
| 852 | |
| 853 | write_lock_bh(&xfrm_policy_lock); |
| 854 | list_del(&walk->walk.all); |
| 855 | write_unlock_bh(&xfrm_policy_lock); |
| 856 | } |
| 857 | EXPORT_SYMBOL(xfrm_policy_walk_done); |
| 858 | |
| 859 | /* |
| 860 | * Find policy to apply to this flow. |
| 861 | * |
| 862 | * Returns 0 if policy found, else an -errno. |
| 863 | */ |
| 864 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
| 865 | u8 type, u16 family, int dir) |
| 866 | { |
| 867 | struct xfrm_selector *sel = &pol->selector; |
| 868 | int match, ret = -ESRCH; |
| 869 | |
| 870 | if (pol->family != family || |
| 871 | (fl->mark & pol->mark.m) != pol->mark.v || |
| 872 | pol->type != type) |
| 873 | return ret; |
| 874 | |
| 875 | match = xfrm_selector_match(sel, fl, family); |
| 876 | if (match) |
| 877 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
| 878 | dir); |
| 879 | |
| 880 | return ret; |
| 881 | } |
| 882 | |
| 883 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
| 884 | struct flowi *fl, |
| 885 | u16 family, u8 dir) |
| 886 | { |
| 887 | int err; |
| 888 | struct xfrm_policy *pol, *ret; |
| 889 | xfrm_address_t *daddr, *saddr; |
| 890 | struct hlist_node *entry; |
| 891 | struct hlist_head *chain; |
| 892 | u32 priority = ~0U; |
| 893 | |
| 894 | daddr = xfrm_flowi_daddr(fl, family); |
| 895 | saddr = xfrm_flowi_saddr(fl, family); |
| 896 | if (unlikely(!daddr || !saddr)) |
| 897 | return NULL; |
| 898 | |
| 899 | read_lock_bh(&xfrm_policy_lock); |
| 900 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
| 901 | ret = NULL; |
| 902 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 903 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 904 | if (err) { |
| 905 | if (err == -ESRCH) |
| 906 | continue; |
| 907 | else { |
| 908 | ret = ERR_PTR(err); |
| 909 | goto fail; |
| 910 | } |
| 911 | } else { |
| 912 | ret = pol; |
| 913 | priority = ret->priority; |
| 914 | break; |
| 915 | } |
| 916 | } |
| 917 | chain = &net->xfrm.policy_inexact[dir]; |
| 918 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 919 | err = xfrm_policy_match(pol, fl, type, family, dir); |
| 920 | if (err) { |
| 921 | if (err == -ESRCH) |
| 922 | continue; |
| 923 | else { |
| 924 | ret = ERR_PTR(err); |
| 925 | goto fail; |
| 926 | } |
| 927 | } else if (pol->priority < priority) { |
| 928 | ret = pol; |
| 929 | break; |
| 930 | } |
| 931 | } |
| 932 | if (ret) |
| 933 | xfrm_pol_hold(ret); |
| 934 | fail: |
| 935 | read_unlock_bh(&xfrm_policy_lock); |
| 936 | |
| 937 | return ret; |
| 938 | } |
| 939 | |
| 940 | static struct xfrm_policy * |
| 941 | __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir) |
| 942 | { |
| 943 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 944 | struct xfrm_policy *pol; |
| 945 | |
| 946 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
| 947 | if (pol != NULL) |
| 948 | return pol; |
| 949 | #endif |
| 950 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
| 951 | } |
| 952 | |
| 953 | static struct flow_cache_object * |
| 954 | xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
| 955 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
| 956 | { |
| 957 | struct xfrm_policy *pol; |
| 958 | |
| 959 | if (old_obj) |
| 960 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); |
| 961 | |
| 962 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
| 963 | if (IS_ERR_OR_NULL(pol)) |
| 964 | return ERR_CAST(pol); |
| 965 | |
| 966 | /* Resolver returns two references: |
| 967 | * one for cache and one for caller of flow_cache_lookup() */ |
| 968 | xfrm_pol_hold(pol); |
| 969 | |
| 970 | return &pol->flo; |
| 971 | } |
| 972 | |
| 973 | static inline int policy_to_flow_dir(int dir) |
| 974 | { |
| 975 | if (XFRM_POLICY_IN == FLOW_DIR_IN && |
| 976 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
| 977 | XFRM_POLICY_FWD == FLOW_DIR_FWD) |
| 978 | return dir; |
| 979 | switch (dir) { |
| 980 | default: |
| 981 | case XFRM_POLICY_IN: |
| 982 | return FLOW_DIR_IN; |
| 983 | case XFRM_POLICY_OUT: |
| 984 | return FLOW_DIR_OUT; |
| 985 | case XFRM_POLICY_FWD: |
| 986 | return FLOW_DIR_FWD; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
| 991 | { |
| 992 | struct xfrm_policy *pol; |
| 993 | |
| 994 | read_lock_bh(&xfrm_policy_lock); |
| 995 | if ((pol = sk->sk_policy[dir]) != NULL) { |
| 996 | int match = xfrm_selector_match(&pol->selector, fl, |
| 997 | sk->sk_family); |
| 998 | int err = 0; |
| 999 | |
| 1000 | if (match) { |
| 1001 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
| 1002 | pol = NULL; |
| 1003 | goto out; |
| 1004 | } |
| 1005 | err = security_xfrm_policy_lookup(pol->security, |
| 1006 | fl->secid, |
| 1007 | policy_to_flow_dir(dir)); |
| 1008 | if (!err) |
| 1009 | xfrm_pol_hold(pol); |
| 1010 | else if (err == -ESRCH) |
| 1011 | pol = NULL; |
| 1012 | else |
| 1013 | pol = ERR_PTR(err); |
| 1014 | } else |
| 1015 | pol = NULL; |
| 1016 | } |
| 1017 | out: |
| 1018 | read_unlock_bh(&xfrm_policy_lock); |
| 1019 | return pol; |
| 1020 | } |
| 1021 | |
| 1022 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) |
| 1023 | { |
| 1024 | struct net *net = xp_net(pol); |
| 1025 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
| 1026 | pol->family, dir); |
| 1027 | |
| 1028 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
| 1029 | hlist_add_head(&pol->bydst, chain); |
| 1030 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
| 1031 | net->xfrm.policy_count[dir]++; |
| 1032 | xfrm_pol_hold(pol); |
| 1033 | |
| 1034 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
| 1035 | schedule_work(&net->xfrm.policy_hash_work); |
| 1036 | } |
| 1037 | |
| 1038 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| 1039 | int dir) |
| 1040 | { |
| 1041 | struct net *net = xp_net(pol); |
| 1042 | |
| 1043 | if (hlist_unhashed(&pol->bydst)) |
| 1044 | return NULL; |
| 1045 | |
| 1046 | hlist_del(&pol->bydst); |
| 1047 | hlist_del(&pol->byidx); |
| 1048 | list_del(&pol->walk.all); |
| 1049 | net->xfrm.policy_count[dir]--; |
| 1050 | |
| 1051 | return pol; |
| 1052 | } |
| 1053 | |
| 1054 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
| 1055 | { |
| 1056 | write_lock_bh(&xfrm_policy_lock); |
| 1057 | pol = __xfrm_policy_unlink(pol, dir); |
| 1058 | write_unlock_bh(&xfrm_policy_lock); |
| 1059 | if (pol) { |
| 1060 | xfrm_policy_kill(pol); |
| 1061 | return 0; |
| 1062 | } |
| 1063 | return -ENOENT; |
| 1064 | } |
| 1065 | EXPORT_SYMBOL(xfrm_policy_delete); |
| 1066 | |
| 1067 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) |
| 1068 | { |
| 1069 | struct net *net = xp_net(pol); |
| 1070 | struct xfrm_policy *old_pol; |
| 1071 | |
| 1072 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1073 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) |
| 1074 | return -EINVAL; |
| 1075 | #endif |
| 1076 | |
| 1077 | write_lock_bh(&xfrm_policy_lock); |
| 1078 | old_pol = sk->sk_policy[dir]; |
| 1079 | sk->sk_policy[dir] = pol; |
| 1080 | if (pol) { |
| 1081 | pol->curlft.add_time = get_seconds(); |
| 1082 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
| 1083 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
| 1084 | } |
| 1085 | if (old_pol) |
| 1086 | /* Unlinking succeeds always. This is the only function |
| 1087 | * allowed to delete or replace socket policy. |
| 1088 | */ |
| 1089 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
| 1090 | write_unlock_bh(&xfrm_policy_lock); |
| 1091 | |
| 1092 | if (old_pol) { |
| 1093 | xfrm_policy_kill(old_pol); |
| 1094 | } |
| 1095 | return 0; |
| 1096 | } |
| 1097 | |
| 1098 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) |
| 1099 | { |
| 1100 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
| 1101 | |
| 1102 | if (newp) { |
| 1103 | newp->selector = old->selector; |
| 1104 | if (security_xfrm_policy_clone(old->security, |
| 1105 | &newp->security)) { |
| 1106 | kfree(newp); |
| 1107 | return NULL; /* ENOMEM */ |
| 1108 | } |
| 1109 | newp->lft = old->lft; |
| 1110 | newp->curlft = old->curlft; |
| 1111 | newp->mark = old->mark; |
| 1112 | newp->action = old->action; |
| 1113 | newp->flags = old->flags; |
| 1114 | newp->xfrm_nr = old->xfrm_nr; |
| 1115 | newp->index = old->index; |
| 1116 | newp->type = old->type; |
| 1117 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
| 1118 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); |
| 1119 | write_lock_bh(&xfrm_policy_lock); |
| 1120 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
| 1121 | write_unlock_bh(&xfrm_policy_lock); |
| 1122 | xfrm_pol_put(newp); |
| 1123 | } |
| 1124 | return newp; |
| 1125 | } |
| 1126 | |
| 1127 | int __xfrm_sk_clone_policy(struct sock *sk) |
| 1128 | { |
| 1129 | struct xfrm_policy *p0 = sk->sk_policy[0], |
| 1130 | *p1 = sk->sk_policy[1]; |
| 1131 | |
| 1132 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; |
| 1133 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) |
| 1134 | return -ENOMEM; |
| 1135 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) |
| 1136 | return -ENOMEM; |
| 1137 | return 0; |
| 1138 | } |
| 1139 | |
| 1140 | static int |
| 1141 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
| 1142 | unsigned short family) |
| 1143 | { |
| 1144 | int err; |
| 1145 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1146 | |
| 1147 | if (unlikely(afinfo == NULL)) |
| 1148 | return -EINVAL; |
| 1149 | err = afinfo->get_saddr(net, local, remote); |
| 1150 | xfrm_policy_put_afinfo(afinfo); |
| 1151 | return err; |
| 1152 | } |
| 1153 | |
| 1154 | /* Resolve list of templates for the flow, given policy. */ |
| 1155 | |
| 1156 | static int |
| 1157 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
| 1158 | struct xfrm_state **xfrm, |
| 1159 | unsigned short family) |
| 1160 | { |
| 1161 | struct net *net = xp_net(policy); |
| 1162 | int nx; |
| 1163 | int i, error; |
| 1164 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); |
| 1165 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); |
| 1166 | xfrm_address_t tmp; |
| 1167 | |
| 1168 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { |
| 1169 | struct xfrm_state *x; |
| 1170 | xfrm_address_t *remote = daddr; |
| 1171 | xfrm_address_t *local = saddr; |
| 1172 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; |
| 1173 | |
| 1174 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
| 1175 | tmpl->mode == XFRM_MODE_BEET) { |
| 1176 | remote = &tmpl->id.daddr; |
| 1177 | local = &tmpl->saddr; |
| 1178 | family = tmpl->encap_family; |
| 1179 | if (xfrm_addr_any(local, family)) { |
| 1180 | error = xfrm_get_saddr(net, &tmp, remote, family); |
| 1181 | if (error) |
| 1182 | goto fail; |
| 1183 | local = &tmp; |
| 1184 | } |
| 1185 | } |
| 1186 | |
| 1187 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); |
| 1188 | |
| 1189 | if (x && x->km.state == XFRM_STATE_VALID) { |
| 1190 | xfrm[nx++] = x; |
| 1191 | daddr = remote; |
| 1192 | saddr = local; |
| 1193 | continue; |
| 1194 | } |
| 1195 | if (x) { |
| 1196 | error = (x->km.state == XFRM_STATE_ERROR ? |
| 1197 | -EINVAL : -EAGAIN); |
| 1198 | xfrm_state_put(x); |
| 1199 | } |
| 1200 | else if (error == -ESRCH) |
| 1201 | error = -EAGAIN; |
| 1202 | |
| 1203 | if (!tmpl->optional) |
| 1204 | goto fail; |
| 1205 | } |
| 1206 | return nx; |
| 1207 | |
| 1208 | fail: |
| 1209 | for (nx--; nx>=0; nx--) |
| 1210 | xfrm_state_put(xfrm[nx]); |
| 1211 | return error; |
| 1212 | } |
| 1213 | |
| 1214 | static int |
| 1215 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, |
| 1216 | struct xfrm_state **xfrm, |
| 1217 | unsigned short family) |
| 1218 | { |
| 1219 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
| 1220 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; |
| 1221 | int cnx = 0; |
| 1222 | int error; |
| 1223 | int ret; |
| 1224 | int i; |
| 1225 | |
| 1226 | for (i = 0; i < npols; i++) { |
| 1227 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { |
| 1228 | error = -ENOBUFS; |
| 1229 | goto fail; |
| 1230 | } |
| 1231 | |
| 1232 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); |
| 1233 | if (ret < 0) { |
| 1234 | error = ret; |
| 1235 | goto fail; |
| 1236 | } else |
| 1237 | cnx += ret; |
| 1238 | } |
| 1239 | |
| 1240 | /* found states are sorted for outbound processing */ |
| 1241 | if (npols > 1) |
| 1242 | xfrm_state_sort(xfrm, tpp, cnx, family); |
| 1243 | |
| 1244 | return cnx; |
| 1245 | |
| 1246 | fail: |
| 1247 | for (cnx--; cnx>=0; cnx--) |
| 1248 | xfrm_state_put(tpp[cnx]); |
| 1249 | return error; |
| 1250 | |
| 1251 | } |
| 1252 | |
| 1253 | /* Check that the bundle accepts the flow and its components are |
| 1254 | * still valid. |
| 1255 | */ |
| 1256 | |
| 1257 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
| 1258 | { |
| 1259 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1260 | int tos; |
| 1261 | |
| 1262 | if (!afinfo) |
| 1263 | return -EINVAL; |
| 1264 | |
| 1265 | tos = afinfo->get_tos(fl); |
| 1266 | |
| 1267 | xfrm_policy_put_afinfo(afinfo); |
| 1268 | |
| 1269 | return tos; |
| 1270 | } |
| 1271 | |
| 1272 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
| 1273 | { |
| 1274 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| 1275 | struct dst_entry *dst = &xdst->u.dst; |
| 1276 | |
| 1277 | if (xdst->route == NULL) { |
| 1278 | /* Dummy bundle - if it has xfrms we were not |
| 1279 | * able to build bundle as template resolution failed. |
| 1280 | * It means we need to try again resolving. */ |
| 1281 | if (xdst->num_xfrms > 0) |
| 1282 | return NULL; |
| 1283 | } else { |
| 1284 | /* Real bundle */ |
| 1285 | if (stale_bundle(dst)) |
| 1286 | return NULL; |
| 1287 | } |
| 1288 | |
| 1289 | dst_hold(dst); |
| 1290 | return flo; |
| 1291 | } |
| 1292 | |
| 1293 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) |
| 1294 | { |
| 1295 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| 1296 | struct dst_entry *dst = &xdst->u.dst; |
| 1297 | |
| 1298 | if (!xdst->route) |
| 1299 | return 0; |
| 1300 | if (stale_bundle(dst)) |
| 1301 | return 0; |
| 1302 | |
| 1303 | return 1; |
| 1304 | } |
| 1305 | |
| 1306 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) |
| 1307 | { |
| 1308 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| 1309 | struct dst_entry *dst = &xdst->u.dst; |
| 1310 | |
| 1311 | dst_free(dst); |
| 1312 | } |
| 1313 | |
| 1314 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { |
| 1315 | .get = xfrm_bundle_flo_get, |
| 1316 | .check = xfrm_bundle_flo_check, |
| 1317 | .delete = xfrm_bundle_flo_delete, |
| 1318 | }; |
| 1319 | |
| 1320 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
| 1321 | { |
| 1322 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1323 | struct dst_ops *dst_ops; |
| 1324 | struct xfrm_dst *xdst; |
| 1325 | |
| 1326 | if (!afinfo) |
| 1327 | return ERR_PTR(-EINVAL); |
| 1328 | |
| 1329 | switch (family) { |
| 1330 | case AF_INET: |
| 1331 | dst_ops = &net->xfrm.xfrm4_dst_ops; |
| 1332 | break; |
| 1333 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 1334 | case AF_INET6: |
| 1335 | dst_ops = &net->xfrm.xfrm6_dst_ops; |
| 1336 | break; |
| 1337 | #endif |
| 1338 | default: |
| 1339 | BUG(); |
| 1340 | } |
| 1341 | xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); |
| 1342 | xfrm_policy_put_afinfo(afinfo); |
| 1343 | |
| 1344 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
| 1345 | |
| 1346 | return xdst; |
| 1347 | } |
| 1348 | |
| 1349 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
| 1350 | int nfheader_len) |
| 1351 | { |
| 1352 | struct xfrm_policy_afinfo *afinfo = |
| 1353 | xfrm_policy_get_afinfo(dst->ops->family); |
| 1354 | int err; |
| 1355 | |
| 1356 | if (!afinfo) |
| 1357 | return -EINVAL; |
| 1358 | |
| 1359 | err = afinfo->init_path(path, dst, nfheader_len); |
| 1360 | |
| 1361 | xfrm_policy_put_afinfo(afinfo); |
| 1362 | |
| 1363 | return err; |
| 1364 | } |
| 1365 | |
| 1366 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
| 1367 | struct flowi *fl) |
| 1368 | { |
| 1369 | struct xfrm_policy_afinfo *afinfo = |
| 1370 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); |
| 1371 | int err; |
| 1372 | |
| 1373 | if (!afinfo) |
| 1374 | return -EINVAL; |
| 1375 | |
| 1376 | err = afinfo->fill_dst(xdst, dev, fl); |
| 1377 | |
| 1378 | xfrm_policy_put_afinfo(afinfo); |
| 1379 | |
| 1380 | return err; |
| 1381 | } |
| 1382 | |
| 1383 | |
| 1384 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
| 1385 | * all the metrics... Shortly, bundle a bundle. |
| 1386 | */ |
| 1387 | |
| 1388 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, |
| 1389 | struct xfrm_state **xfrm, int nx, |
| 1390 | struct flowi *fl, |
| 1391 | struct dst_entry *dst) |
| 1392 | { |
| 1393 | struct net *net = xp_net(policy); |
| 1394 | unsigned long now = jiffies; |
| 1395 | struct net_device *dev; |
| 1396 | struct dst_entry *dst_prev = NULL; |
| 1397 | struct dst_entry *dst0 = NULL; |
| 1398 | int i = 0; |
| 1399 | int err; |
| 1400 | int header_len = 0; |
| 1401 | int nfheader_len = 0; |
| 1402 | int trailer_len = 0; |
| 1403 | int tos; |
| 1404 | int family = policy->selector.family; |
| 1405 | xfrm_address_t saddr, daddr; |
| 1406 | |
| 1407 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); |
| 1408 | |
| 1409 | tos = xfrm_get_tos(fl, family); |
| 1410 | err = tos; |
| 1411 | if (tos < 0) |
| 1412 | goto put_states; |
| 1413 | |
| 1414 | dst_hold(dst); |
| 1415 | |
| 1416 | for (; i < nx; i++) { |
| 1417 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
| 1418 | struct dst_entry *dst1 = &xdst->u.dst; |
| 1419 | |
| 1420 | err = PTR_ERR(xdst); |
| 1421 | if (IS_ERR(xdst)) { |
| 1422 | dst_release(dst); |
| 1423 | goto put_states; |
| 1424 | } |
| 1425 | |
| 1426 | if (!dst_prev) |
| 1427 | dst0 = dst1; |
| 1428 | else { |
| 1429 | dst_prev->child = dst_clone(dst1); |
| 1430 | dst1->flags |= DST_NOHASH; |
| 1431 | } |
| 1432 | |
| 1433 | xdst->route = dst; |
| 1434 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); |
| 1435 | |
| 1436 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1437 | family = xfrm[i]->props.family; |
| 1438 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
| 1439 | family); |
| 1440 | err = PTR_ERR(dst); |
| 1441 | if (IS_ERR(dst)) |
| 1442 | goto put_states; |
| 1443 | } else |
| 1444 | dst_hold(dst); |
| 1445 | |
| 1446 | dst1->xfrm = xfrm[i]; |
| 1447 | xdst->xfrm_genid = xfrm[i]->genid; |
| 1448 | |
| 1449 | dst1->obsolete = -1; |
| 1450 | dst1->flags |= DST_HOST; |
| 1451 | dst1->lastuse = now; |
| 1452 | |
| 1453 | dst1->input = dst_discard; |
| 1454 | dst1->output = xfrm[i]->outer_mode->afinfo->output; |
| 1455 | |
| 1456 | dst1->next = dst_prev; |
| 1457 | dst_prev = dst1; |
| 1458 | |
| 1459 | header_len += xfrm[i]->props.header_len; |
| 1460 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
| 1461 | nfheader_len += xfrm[i]->props.header_len; |
| 1462 | trailer_len += xfrm[i]->props.trailer_len; |
| 1463 | } |
| 1464 | |
| 1465 | dst_prev->child = dst; |
| 1466 | dst0->path = dst; |
| 1467 | |
| 1468 | err = -ENODEV; |
| 1469 | dev = dst->dev; |
| 1470 | if (!dev) |
| 1471 | goto free_dst; |
| 1472 | |
| 1473 | /* Copy neighbour for reachability confirmation */ |
| 1474 | dst0->neighbour = neigh_clone(dst->neighbour); |
| 1475 | |
| 1476 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
| 1477 | xfrm_init_pmtu(dst_prev); |
| 1478 | |
| 1479 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { |
| 1480 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; |
| 1481 | |
| 1482 | err = xfrm_fill_dst(xdst, dev, fl); |
| 1483 | if (err) |
| 1484 | goto free_dst; |
| 1485 | |
| 1486 | dst_prev->header_len = header_len; |
| 1487 | dst_prev->trailer_len = trailer_len; |
| 1488 | header_len -= xdst->u.dst.xfrm->props.header_len; |
| 1489 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; |
| 1490 | } |
| 1491 | |
| 1492 | out: |
| 1493 | return dst0; |
| 1494 | |
| 1495 | put_states: |
| 1496 | for (; i < nx; i++) |
| 1497 | xfrm_state_put(xfrm[i]); |
| 1498 | free_dst: |
| 1499 | if (dst0) |
| 1500 | dst_free(dst0); |
| 1501 | dst0 = ERR_PTR(err); |
| 1502 | goto out; |
| 1503 | } |
| 1504 | |
| 1505 | static int inline |
| 1506 | xfrm_dst_alloc_copy(void **target, void *src, int size) |
| 1507 | { |
| 1508 | if (!*target) { |
| 1509 | *target = kmalloc(size, GFP_ATOMIC); |
| 1510 | if (!*target) |
| 1511 | return -ENOMEM; |
| 1512 | } |
| 1513 | memcpy(*target, src, size); |
| 1514 | return 0; |
| 1515 | } |
| 1516 | |
| 1517 | static int inline |
| 1518 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) |
| 1519 | { |
| 1520 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1521 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1522 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), |
| 1523 | sel, sizeof(*sel)); |
| 1524 | #else |
| 1525 | return 0; |
| 1526 | #endif |
| 1527 | } |
| 1528 | |
| 1529 | static int inline |
| 1530 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) |
| 1531 | { |
| 1532 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1533 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 1534 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); |
| 1535 | #else |
| 1536 | return 0; |
| 1537 | #endif |
| 1538 | } |
| 1539 | |
| 1540 | static int xfrm_expand_policies(struct flowi *fl, u16 family, |
| 1541 | struct xfrm_policy **pols, |
| 1542 | int *num_pols, int *num_xfrms) |
| 1543 | { |
| 1544 | int i; |
| 1545 | |
| 1546 | if (*num_pols == 0 || !pols[0]) { |
| 1547 | *num_pols = 0; |
| 1548 | *num_xfrms = 0; |
| 1549 | return 0; |
| 1550 | } |
| 1551 | if (IS_ERR(pols[0])) |
| 1552 | return PTR_ERR(pols[0]); |
| 1553 | |
| 1554 | *num_xfrms = pols[0]->xfrm_nr; |
| 1555 | |
| 1556 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 1557 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && |
| 1558 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 1559 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), |
| 1560 | XFRM_POLICY_TYPE_MAIN, |
| 1561 | fl, family, |
| 1562 | XFRM_POLICY_OUT); |
| 1563 | if (pols[1]) { |
| 1564 | if (IS_ERR(pols[1])) { |
| 1565 | xfrm_pols_put(pols, *num_pols); |
| 1566 | return PTR_ERR(pols[1]); |
| 1567 | } |
| 1568 | (*num_pols) ++; |
| 1569 | (*num_xfrms) += pols[1]->xfrm_nr; |
| 1570 | } |
| 1571 | } |
| 1572 | #endif |
| 1573 | for (i = 0; i < *num_pols; i++) { |
| 1574 | if (pols[i]->action != XFRM_POLICY_ALLOW) { |
| 1575 | *num_xfrms = -1; |
| 1576 | break; |
| 1577 | } |
| 1578 | } |
| 1579 | |
| 1580 | return 0; |
| 1581 | |
| 1582 | } |
| 1583 | |
| 1584 | static struct xfrm_dst * |
| 1585 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, |
| 1586 | struct flowi *fl, u16 family, |
| 1587 | struct dst_entry *dst_orig) |
| 1588 | { |
| 1589 | struct net *net = xp_net(pols[0]); |
| 1590 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
| 1591 | struct dst_entry *dst; |
| 1592 | struct xfrm_dst *xdst; |
| 1593 | int err; |
| 1594 | |
| 1595 | /* Try to instantiate a bundle */ |
| 1596 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); |
| 1597 | if (err < 0) { |
| 1598 | if (err != -EAGAIN) |
| 1599 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
| 1600 | return ERR_PTR(err); |
| 1601 | } |
| 1602 | |
| 1603 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); |
| 1604 | if (IS_ERR(dst)) { |
| 1605 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
| 1606 | return ERR_CAST(dst); |
| 1607 | } |
| 1608 | |
| 1609 | xdst = (struct xfrm_dst *)dst; |
| 1610 | xdst->num_xfrms = err; |
| 1611 | if (num_pols > 1) |
| 1612 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); |
| 1613 | else |
| 1614 | err = xfrm_dst_update_origin(dst, fl); |
| 1615 | if (unlikely(err)) { |
| 1616 | dst_free(dst); |
| 1617 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
| 1618 | return ERR_PTR(err); |
| 1619 | } |
| 1620 | |
| 1621 | xdst->num_pols = num_pols; |
| 1622 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); |
| 1623 | xdst->policy_genid = atomic_read(&pols[0]->genid); |
| 1624 | |
| 1625 | return xdst; |
| 1626 | } |
| 1627 | |
| 1628 | static struct flow_cache_object * |
| 1629 | xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir, |
| 1630 | struct flow_cache_object *oldflo, void *ctx) |
| 1631 | { |
| 1632 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; |
| 1633 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1634 | struct xfrm_dst *xdst, *new_xdst; |
| 1635 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; |
| 1636 | |
| 1637 | /* Check if the policies from old bundle are usable */ |
| 1638 | xdst = NULL; |
| 1639 | if (oldflo) { |
| 1640 | xdst = container_of(oldflo, struct xfrm_dst, flo); |
| 1641 | num_pols = xdst->num_pols; |
| 1642 | num_xfrms = xdst->num_xfrms; |
| 1643 | pol_dead = 0; |
| 1644 | for (i = 0; i < num_pols; i++) { |
| 1645 | pols[i] = xdst->pols[i]; |
| 1646 | pol_dead |= pols[i]->walk.dead; |
| 1647 | } |
| 1648 | if (pol_dead) { |
| 1649 | dst_free(&xdst->u.dst); |
| 1650 | xdst = NULL; |
| 1651 | num_pols = 0; |
| 1652 | num_xfrms = 0; |
| 1653 | oldflo = NULL; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | /* Resolve policies to use if we couldn't get them from |
| 1658 | * previous cache entry */ |
| 1659 | if (xdst == NULL) { |
| 1660 | num_pols = 1; |
| 1661 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); |
| 1662 | err = xfrm_expand_policies(fl, family, pols, |
| 1663 | &num_pols, &num_xfrms); |
| 1664 | if (err < 0) |
| 1665 | goto inc_error; |
| 1666 | if (num_pols == 0) |
| 1667 | return NULL; |
| 1668 | if (num_xfrms <= 0) |
| 1669 | goto make_dummy_bundle; |
| 1670 | } |
| 1671 | |
| 1672 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); |
| 1673 | if (IS_ERR(new_xdst)) { |
| 1674 | err = PTR_ERR(new_xdst); |
| 1675 | if (err != -EAGAIN) |
| 1676 | goto error; |
| 1677 | if (oldflo == NULL) |
| 1678 | goto make_dummy_bundle; |
| 1679 | dst_hold(&xdst->u.dst); |
| 1680 | return oldflo; |
| 1681 | } |
| 1682 | |
| 1683 | /* Kill the previous bundle */ |
| 1684 | if (xdst) { |
| 1685 | /* The policies were stolen for newly generated bundle */ |
| 1686 | xdst->num_pols = 0; |
| 1687 | dst_free(&xdst->u.dst); |
| 1688 | } |
| 1689 | |
| 1690 | /* Flow cache does not have reference, it dst_free()'s, |
| 1691 | * but we do need to return one reference for original caller */ |
| 1692 | dst_hold(&new_xdst->u.dst); |
| 1693 | return &new_xdst->flo; |
| 1694 | |
| 1695 | make_dummy_bundle: |
| 1696 | /* We found policies, but there's no bundles to instantiate: |
| 1697 | * either because the policy blocks, has no transformations or |
| 1698 | * we could not build template (no xfrm_states).*/ |
| 1699 | xdst = xfrm_alloc_dst(net, family); |
| 1700 | if (IS_ERR(xdst)) { |
| 1701 | xfrm_pols_put(pols, num_pols); |
| 1702 | return ERR_CAST(xdst); |
| 1703 | } |
| 1704 | xdst->num_pols = num_pols; |
| 1705 | xdst->num_xfrms = num_xfrms; |
| 1706 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); |
| 1707 | |
| 1708 | dst_hold(&xdst->u.dst); |
| 1709 | return &xdst->flo; |
| 1710 | |
| 1711 | inc_error: |
| 1712 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
| 1713 | error: |
| 1714 | if (xdst != NULL) |
| 1715 | dst_free(&xdst->u.dst); |
| 1716 | else |
| 1717 | xfrm_pols_put(pols, num_pols); |
| 1718 | return ERR_PTR(err); |
| 1719 | } |
| 1720 | |
| 1721 | /* Main function: finds/creates a bundle for given flow. |
| 1722 | * |
| 1723 | * At the moment we eat a raw IP route. Mostly to speed up lookups |
| 1724 | * on interfaces with disabled IPsec. |
| 1725 | */ |
| 1726 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
| 1727 | struct sock *sk, int flags) |
| 1728 | { |
| 1729 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1730 | struct flow_cache_object *flo; |
| 1731 | struct xfrm_dst *xdst; |
| 1732 | struct dst_entry *dst, *dst_orig = *dst_p, *route; |
| 1733 | u16 family = dst_orig->ops->family; |
| 1734 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
| 1735 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
| 1736 | |
| 1737 | restart: |
| 1738 | dst = NULL; |
| 1739 | xdst = NULL; |
| 1740 | route = NULL; |
| 1741 | |
| 1742 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
| 1743 | num_pols = 1; |
| 1744 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
| 1745 | err = xfrm_expand_policies(fl, family, pols, |
| 1746 | &num_pols, &num_xfrms); |
| 1747 | if (err < 0) |
| 1748 | goto dropdst; |
| 1749 | |
| 1750 | if (num_pols) { |
| 1751 | if (num_xfrms <= 0) { |
| 1752 | drop_pols = num_pols; |
| 1753 | goto no_transform; |
| 1754 | } |
| 1755 | |
| 1756 | xdst = xfrm_resolve_and_create_bundle( |
| 1757 | pols, num_pols, fl, |
| 1758 | family, dst_orig); |
| 1759 | if (IS_ERR(xdst)) { |
| 1760 | xfrm_pols_put(pols, num_pols); |
| 1761 | err = PTR_ERR(xdst); |
| 1762 | goto dropdst; |
| 1763 | } |
| 1764 | |
| 1765 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
| 1766 | xdst->u.dst.next = xfrm_policy_sk_bundles; |
| 1767 | xfrm_policy_sk_bundles = &xdst->u.dst; |
| 1768 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); |
| 1769 | |
| 1770 | route = xdst->route; |
| 1771 | } |
| 1772 | } |
| 1773 | |
| 1774 | if (xdst == NULL) { |
| 1775 | /* To accelerate a bit... */ |
| 1776 | if ((dst_orig->flags & DST_NOXFRM) || |
| 1777 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
| 1778 | goto nopol; |
| 1779 | |
| 1780 | flo = flow_cache_lookup(net, fl, family, dir, |
| 1781 | xfrm_bundle_lookup, dst_orig); |
| 1782 | if (flo == NULL) |
| 1783 | goto nopol; |
| 1784 | if (IS_ERR(flo)) { |
| 1785 | err = PTR_ERR(flo); |
| 1786 | goto dropdst; |
| 1787 | } |
| 1788 | xdst = container_of(flo, struct xfrm_dst, flo); |
| 1789 | |
| 1790 | num_pols = xdst->num_pols; |
| 1791 | num_xfrms = xdst->num_xfrms; |
| 1792 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); |
| 1793 | route = xdst->route; |
| 1794 | } |
| 1795 | |
| 1796 | dst = &xdst->u.dst; |
| 1797 | if (route == NULL && num_xfrms > 0) { |
| 1798 | /* The only case when xfrm_bundle_lookup() returns a |
| 1799 | * bundle with null route, is when the template could |
| 1800 | * not be resolved. It means policies are there, but |
| 1801 | * bundle could not be created, since we don't yet |
| 1802 | * have the xfrm_state's. We need to wait for KM to |
| 1803 | * negotiate new SA's or bail out with error.*/ |
| 1804 | if (net->xfrm.sysctl_larval_drop) { |
| 1805 | /* EREMOTE tells the caller to generate |
| 1806 | * a one-shot blackhole route. */ |
| 1807 | dst_release(dst); |
| 1808 | xfrm_pols_put(pols, drop_pols); |
| 1809 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
| 1810 | return -EREMOTE; |
| 1811 | } |
| 1812 | if (flags & XFRM_LOOKUP_WAIT) { |
| 1813 | DECLARE_WAITQUEUE(wait, current); |
| 1814 | |
| 1815 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
| 1816 | set_current_state(TASK_INTERRUPTIBLE); |
| 1817 | schedule(); |
| 1818 | set_current_state(TASK_RUNNING); |
| 1819 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
| 1820 | |
| 1821 | if (!signal_pending(current)) { |
| 1822 | dst_release(dst); |
| 1823 | goto restart; |
| 1824 | } |
| 1825 | |
| 1826 | err = -ERESTART; |
| 1827 | } else |
| 1828 | err = -EAGAIN; |
| 1829 | |
| 1830 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
| 1831 | goto error; |
| 1832 | } |
| 1833 | |
| 1834 | no_transform: |
| 1835 | if (num_pols == 0) |
| 1836 | goto nopol; |
| 1837 | |
| 1838 | if ((flags & XFRM_LOOKUP_ICMP) && |
| 1839 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { |
| 1840 | err = -ENOENT; |
| 1841 | goto error; |
| 1842 | } |
| 1843 | |
| 1844 | for (i = 0; i < num_pols; i++) |
| 1845 | pols[i]->curlft.use_time = get_seconds(); |
| 1846 | |
| 1847 | if (num_xfrms < 0) { |
| 1848 | /* Prohibit the flow */ |
| 1849 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
| 1850 | err = -EPERM; |
| 1851 | goto error; |
| 1852 | } else if (num_xfrms > 0) { |
| 1853 | /* Flow transformed */ |
| 1854 | *dst_p = dst; |
| 1855 | dst_release(dst_orig); |
| 1856 | } else { |
| 1857 | /* Flow passes untransformed */ |
| 1858 | dst_release(dst); |
| 1859 | } |
| 1860 | ok: |
| 1861 | xfrm_pols_put(pols, drop_pols); |
| 1862 | return 0; |
| 1863 | |
| 1864 | nopol: |
| 1865 | if (!(flags & XFRM_LOOKUP_ICMP)) |
| 1866 | goto ok; |
| 1867 | err = -ENOENT; |
| 1868 | error: |
| 1869 | dst_release(dst); |
| 1870 | dropdst: |
| 1871 | dst_release(dst_orig); |
| 1872 | *dst_p = NULL; |
| 1873 | xfrm_pols_put(pols, drop_pols); |
| 1874 | return err; |
| 1875 | } |
| 1876 | EXPORT_SYMBOL(__xfrm_lookup); |
| 1877 | |
| 1878 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
| 1879 | struct sock *sk, int flags) |
| 1880 | { |
| 1881 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
| 1882 | |
| 1883 | if (err == -EREMOTE) { |
| 1884 | dst_release(*dst_p); |
| 1885 | *dst_p = NULL; |
| 1886 | err = -EAGAIN; |
| 1887 | } |
| 1888 | |
| 1889 | return err; |
| 1890 | } |
| 1891 | EXPORT_SYMBOL(xfrm_lookup); |
| 1892 | |
| 1893 | static inline int |
| 1894 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) |
| 1895 | { |
| 1896 | struct xfrm_state *x; |
| 1897 | |
| 1898 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) |
| 1899 | return 0; |
| 1900 | x = skb->sp->xvec[idx]; |
| 1901 | if (!x->type->reject) |
| 1902 | return 0; |
| 1903 | return x->type->reject(x, skb, fl); |
| 1904 | } |
| 1905 | |
| 1906 | /* When skb is transformed back to its "native" form, we have to |
| 1907 | * check policy restrictions. At the moment we make this in maximally |
| 1908 | * stupid way. Shame on me. :-) Of course, connected sockets must |
| 1909 | * have policy cached at them. |
| 1910 | */ |
| 1911 | |
| 1912 | static inline int |
| 1913 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
| 1914 | unsigned short family) |
| 1915 | { |
| 1916 | if (xfrm_state_kern(x)) |
| 1917 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
| 1918 | return x->id.proto == tmpl->id.proto && |
| 1919 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && |
| 1920 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && |
| 1921 | x->props.mode == tmpl->mode && |
| 1922 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
| 1923 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
| 1924 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
| 1925 | xfrm_state_addr_cmp(tmpl, x, family)); |
| 1926 | } |
| 1927 | |
| 1928 | /* |
| 1929 | * 0 or more than 0 is returned when validation is succeeded (either bypass |
| 1930 | * because of optional transport mode, or next index of the mathced secpath |
| 1931 | * state with the template. |
| 1932 | * -1 is returned when no matching template is found. |
| 1933 | * Otherwise "-2 - errored_index" is returned. |
| 1934 | */ |
| 1935 | static inline int |
| 1936 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, |
| 1937 | unsigned short family) |
| 1938 | { |
| 1939 | int idx = start; |
| 1940 | |
| 1941 | if (tmpl->optional) { |
| 1942 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
| 1943 | return start; |
| 1944 | } else |
| 1945 | start = -1; |
| 1946 | for (; idx < sp->len; idx++) { |
| 1947 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
| 1948 | return ++idx; |
| 1949 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1950 | if (start == -1) |
| 1951 | start = -2-idx; |
| 1952 | break; |
| 1953 | } |
| 1954 | } |
| 1955 | return start; |
| 1956 | } |
| 1957 | |
| 1958 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
| 1959 | unsigned int family, int reverse) |
| 1960 | { |
| 1961 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| 1962 | int err; |
| 1963 | |
| 1964 | if (unlikely(afinfo == NULL)) |
| 1965 | return -EAFNOSUPPORT; |
| 1966 | |
| 1967 | afinfo->decode_session(skb, fl, reverse); |
| 1968 | err = security_xfrm_decode_session(skb, &fl->secid); |
| 1969 | xfrm_policy_put_afinfo(afinfo); |
| 1970 | return err; |
| 1971 | } |
| 1972 | EXPORT_SYMBOL(__xfrm_decode_session); |
| 1973 | |
| 1974 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
| 1975 | { |
| 1976 | for (; k < sp->len; k++) { |
| 1977 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
| 1978 | *idxp = k; |
| 1979 | return 1; |
| 1980 | } |
| 1981 | } |
| 1982 | |
| 1983 | return 0; |
| 1984 | } |
| 1985 | |
| 1986 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
| 1987 | unsigned short family) |
| 1988 | { |
| 1989 | struct net *net = dev_net(skb->dev); |
| 1990 | struct xfrm_policy *pol; |
| 1991 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| 1992 | int npols = 0; |
| 1993 | int xfrm_nr; |
| 1994 | int pi; |
| 1995 | int reverse; |
| 1996 | struct flowi fl; |
| 1997 | u8 fl_dir; |
| 1998 | int xerr_idx = -1; |
| 1999 | |
| 2000 | reverse = dir & ~XFRM_POLICY_MASK; |
| 2001 | dir &= XFRM_POLICY_MASK; |
| 2002 | fl_dir = policy_to_flow_dir(dir); |
| 2003 | |
| 2004 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
| 2005 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
| 2006 | return 0; |
| 2007 | } |
| 2008 | |
| 2009 | nf_nat_decode_session(skb, &fl, family); |
| 2010 | |
| 2011 | /* First, check used SA against their selectors. */ |
| 2012 | if (skb->sp) { |
| 2013 | int i; |
| 2014 | |
| 2015 | for (i=skb->sp->len-1; i>=0; i--) { |
| 2016 | struct xfrm_state *x = skb->sp->xvec[i]; |
| 2017 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
| 2018 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
| 2019 | return 0; |
| 2020 | } |
| 2021 | } |
| 2022 | } |
| 2023 | |
| 2024 | pol = NULL; |
| 2025 | if (sk && sk->sk_policy[dir]) { |
| 2026 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
| 2027 | if (IS_ERR(pol)) { |
| 2028 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
| 2029 | return 0; |
| 2030 | } |
| 2031 | } |
| 2032 | |
| 2033 | if (!pol) { |
| 2034 | struct flow_cache_object *flo; |
| 2035 | |
| 2036 | flo = flow_cache_lookup(net, &fl, family, fl_dir, |
| 2037 | xfrm_policy_lookup, NULL); |
| 2038 | if (IS_ERR_OR_NULL(flo)) |
| 2039 | pol = ERR_CAST(flo); |
| 2040 | else |
| 2041 | pol = container_of(flo, struct xfrm_policy, flo); |
| 2042 | } |
| 2043 | |
| 2044 | if (IS_ERR(pol)) { |
| 2045 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
| 2046 | return 0; |
| 2047 | } |
| 2048 | |
| 2049 | if (!pol) { |
| 2050 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
| 2051 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
| 2052 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
| 2053 | return 0; |
| 2054 | } |
| 2055 | return 1; |
| 2056 | } |
| 2057 | |
| 2058 | pol->curlft.use_time = get_seconds(); |
| 2059 | |
| 2060 | pols[0] = pol; |
| 2061 | npols ++; |
| 2062 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 2063 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { |
| 2064 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
| 2065 | &fl, family, |
| 2066 | XFRM_POLICY_IN); |
| 2067 | if (pols[1]) { |
| 2068 | if (IS_ERR(pols[1])) { |
| 2069 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
| 2070 | return 0; |
| 2071 | } |
| 2072 | pols[1]->curlft.use_time = get_seconds(); |
| 2073 | npols ++; |
| 2074 | } |
| 2075 | } |
| 2076 | #endif |
| 2077 | |
| 2078 | if (pol->action == XFRM_POLICY_ALLOW) { |
| 2079 | struct sec_path *sp; |
| 2080 | static struct sec_path dummy; |
| 2081 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
| 2082 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
| 2083 | struct xfrm_tmpl **tpp = tp; |
| 2084 | int ti = 0; |
| 2085 | int i, k; |
| 2086 | |
| 2087 | if ((sp = skb->sp) == NULL) |
| 2088 | sp = &dummy; |
| 2089 | |
| 2090 | for (pi = 0; pi < npols; pi++) { |
| 2091 | if (pols[pi] != pol && |
| 2092 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
| 2093 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
| 2094 | goto reject; |
| 2095 | } |
| 2096 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { |
| 2097 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
| 2098 | goto reject_error; |
| 2099 | } |
| 2100 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
| 2101 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; |
| 2102 | } |
| 2103 | xfrm_nr = ti; |
| 2104 | if (npols > 1) { |
| 2105 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); |
| 2106 | tpp = stp; |
| 2107 | } |
| 2108 | |
| 2109 | /* For each tunnel xfrm, find the first matching tmpl. |
| 2110 | * For each tmpl before that, find corresponding xfrm. |
| 2111 | * Order is _important_. Later we will implement |
| 2112 | * some barriers, but at the moment barriers |
| 2113 | * are implied between each two transformations. |
| 2114 | */ |
| 2115 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
| 2116 | k = xfrm_policy_ok(tpp[i], sp, k, family); |
| 2117 | if (k < 0) { |
| 2118 | if (k < -1) |
| 2119 | /* "-2 - errored_index" returned */ |
| 2120 | xerr_idx = -(2+k); |
| 2121 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
| 2122 | goto reject; |
| 2123 | } |
| 2124 | } |
| 2125 | |
| 2126 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
| 2127 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
| 2128 | goto reject; |
| 2129 | } |
| 2130 | |
| 2131 | xfrm_pols_put(pols, npols); |
| 2132 | return 1; |
| 2133 | } |
| 2134 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
| 2135 | |
| 2136 | reject: |
| 2137 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
| 2138 | reject_error: |
| 2139 | xfrm_pols_put(pols, npols); |
| 2140 | return 0; |
| 2141 | } |
| 2142 | EXPORT_SYMBOL(__xfrm_policy_check); |
| 2143 | |
| 2144 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) |
| 2145 | { |
| 2146 | struct net *net = dev_net(skb->dev); |
| 2147 | struct flowi fl; |
| 2148 | struct dst_entry *dst; |
| 2149 | int res; |
| 2150 | |
| 2151 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
| 2152 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
| 2153 | return 0; |
| 2154 | } |
| 2155 | |
| 2156 | skb_dst_force(skb); |
| 2157 | dst = skb_dst(skb); |
| 2158 | |
| 2159 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; |
| 2160 | skb_dst_set(skb, dst); |
| 2161 | return res; |
| 2162 | } |
| 2163 | EXPORT_SYMBOL(__xfrm_route_forward); |
| 2164 | |
| 2165 | /* Optimize later using cookies and generation ids. */ |
| 2166 | |
| 2167 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
| 2168 | { |
| 2169 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
| 2170 | * to "-1" to force all XFRM destinations to get validated by |
| 2171 | * dst_ops->check on every use. We do this because when a |
| 2172 | * normal route referenced by an XFRM dst is obsoleted we do |
| 2173 | * not go looking around for all parent referencing XFRM dsts |
| 2174 | * so that we can invalidate them. It is just too much work. |
| 2175 | * Instead we make the checks here on every use. For example: |
| 2176 | * |
| 2177 | * XFRM dst A --> IPv4 dst X |
| 2178 | * |
| 2179 | * X is the "xdst->route" of A (X is also the "dst->path" of A |
| 2180 | * in this example). If X is marked obsolete, "A" will not |
| 2181 | * notice. That's what we are validating here via the |
| 2182 | * stale_bundle() check. |
| 2183 | * |
| 2184 | * When a policy's bundle is pruned, we dst_free() the XFRM |
| 2185 | * dst which causes it's ->obsolete field to be set to a |
| 2186 | * positive non-zero integer. If an XFRM dst has been pruned |
| 2187 | * like this, we want to force a new route lookup. |
| 2188 | */ |
| 2189 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
| 2190 | return dst; |
| 2191 | |
| 2192 | return NULL; |
| 2193 | } |
| 2194 | |
| 2195 | static int stale_bundle(struct dst_entry *dst) |
| 2196 | { |
| 2197 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
| 2198 | } |
| 2199 | |
| 2200 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
| 2201 | { |
| 2202 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
| 2203 | dst->dev = dev_net(dev)->loopback_dev; |
| 2204 | dev_hold(dst->dev); |
| 2205 | dev_put(dev); |
| 2206 | } |
| 2207 | } |
| 2208 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
| 2209 | |
| 2210 | static void xfrm_link_failure(struct sk_buff *skb) |
| 2211 | { |
| 2212 | /* Impossible. Such dst must be popped before reaches point of failure. */ |
| 2213 | } |
| 2214 | |
| 2215 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) |
| 2216 | { |
| 2217 | if (dst) { |
| 2218 | if (dst->obsolete) { |
| 2219 | dst_release(dst); |
| 2220 | dst = NULL; |
| 2221 | } |
| 2222 | } |
| 2223 | return dst; |
| 2224 | } |
| 2225 | |
| 2226 | static void __xfrm_garbage_collect(struct net *net) |
| 2227 | { |
| 2228 | struct dst_entry *head, *next; |
| 2229 | |
| 2230 | flow_cache_flush(); |
| 2231 | |
| 2232 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
| 2233 | head = xfrm_policy_sk_bundles; |
| 2234 | xfrm_policy_sk_bundles = NULL; |
| 2235 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); |
| 2236 | |
| 2237 | while (head) { |
| 2238 | next = head->next; |
| 2239 | dst_free(head); |
| 2240 | head = next; |
| 2241 | } |
| 2242 | } |
| 2243 | |
| 2244 | static void xfrm_init_pmtu(struct dst_entry *dst) |
| 2245 | { |
| 2246 | do { |
| 2247 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 2248 | u32 pmtu, route_mtu_cached; |
| 2249 | |
| 2250 | pmtu = dst_mtu(dst->child); |
| 2251 | xdst->child_mtu_cached = pmtu; |
| 2252 | |
| 2253 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); |
| 2254 | |
| 2255 | route_mtu_cached = dst_mtu(xdst->route); |
| 2256 | xdst->route_mtu_cached = route_mtu_cached; |
| 2257 | |
| 2258 | if (pmtu > route_mtu_cached) |
| 2259 | pmtu = route_mtu_cached; |
| 2260 | |
| 2261 | dst->metrics[RTAX_MTU-1] = pmtu; |
| 2262 | } while ((dst = dst->next)); |
| 2263 | } |
| 2264 | |
| 2265 | /* Check that the bundle accepts the flow and its components are |
| 2266 | * still valid. |
| 2267 | */ |
| 2268 | |
| 2269 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
| 2270 | struct flowi *fl, int family, int strict) |
| 2271 | { |
| 2272 | struct dst_entry *dst = &first->u.dst; |
| 2273 | struct xfrm_dst *last; |
| 2274 | u32 mtu; |
| 2275 | |
| 2276 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
| 2277 | (dst->dev && !netif_running(dst->dev))) |
| 2278 | return 0; |
| 2279 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 2280 | if (fl) { |
| 2281 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) |
| 2282 | return 0; |
| 2283 | if (first->partner && |
| 2284 | !xfrm_selector_match(first->partner, fl, family)) |
| 2285 | return 0; |
| 2286 | } |
| 2287 | #endif |
| 2288 | |
| 2289 | last = NULL; |
| 2290 | |
| 2291 | do { |
| 2292 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 2293 | |
| 2294 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) |
| 2295 | return 0; |
| 2296 | if (fl && pol && |
| 2297 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) |
| 2298 | return 0; |
| 2299 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
| 2300 | return 0; |
| 2301 | if (xdst->xfrm_genid != dst->xfrm->genid) |
| 2302 | return 0; |
| 2303 | if (xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) |
| 2304 | return 0; |
| 2305 | |
| 2306 | if (strict && fl && |
| 2307 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
| 2308 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
| 2309 | return 0; |
| 2310 | |
| 2311 | mtu = dst_mtu(dst->child); |
| 2312 | if (xdst->child_mtu_cached != mtu) { |
| 2313 | last = xdst; |
| 2314 | xdst->child_mtu_cached = mtu; |
| 2315 | } |
| 2316 | |
| 2317 | if (!dst_check(xdst->route, xdst->route_cookie)) |
| 2318 | return 0; |
| 2319 | mtu = dst_mtu(xdst->route); |
| 2320 | if (xdst->route_mtu_cached != mtu) { |
| 2321 | last = xdst; |
| 2322 | xdst->route_mtu_cached = mtu; |
| 2323 | } |
| 2324 | |
| 2325 | dst = dst->child; |
| 2326 | } while (dst->xfrm); |
| 2327 | |
| 2328 | if (likely(!last)) |
| 2329 | return 1; |
| 2330 | |
| 2331 | mtu = last->child_mtu_cached; |
| 2332 | for (;;) { |
| 2333 | dst = &last->u.dst; |
| 2334 | |
| 2335 | mtu = xfrm_state_mtu(dst->xfrm, mtu); |
| 2336 | if (mtu > last->route_mtu_cached) |
| 2337 | mtu = last->route_mtu_cached; |
| 2338 | dst->metrics[RTAX_MTU-1] = mtu; |
| 2339 | |
| 2340 | if (last == first) |
| 2341 | break; |
| 2342 | |
| 2343 | last = (struct xfrm_dst *)last->u.dst.next; |
| 2344 | last->child_mtu_cached = mtu; |
| 2345 | } |
| 2346 | |
| 2347 | return 1; |
| 2348 | } |
| 2349 | |
| 2350 | EXPORT_SYMBOL(xfrm_bundle_ok); |
| 2351 | |
| 2352 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2353 | { |
| 2354 | struct net *net; |
| 2355 | int err = 0; |
| 2356 | if (unlikely(afinfo == NULL)) |
| 2357 | return -EINVAL; |
| 2358 | if (unlikely(afinfo->family >= NPROTO)) |
| 2359 | return -EAFNOSUPPORT; |
| 2360 | write_lock_bh(&xfrm_policy_afinfo_lock); |
| 2361 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
| 2362 | err = -ENOBUFS; |
| 2363 | else { |
| 2364 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2365 | if (likely(dst_ops->kmem_cachep == NULL)) |
| 2366 | dst_ops->kmem_cachep = xfrm_dst_cache; |
| 2367 | if (likely(dst_ops->check == NULL)) |
| 2368 | dst_ops->check = xfrm_dst_check; |
| 2369 | if (likely(dst_ops->negative_advice == NULL)) |
| 2370 | dst_ops->negative_advice = xfrm_negative_advice; |
| 2371 | if (likely(dst_ops->link_failure == NULL)) |
| 2372 | dst_ops->link_failure = xfrm_link_failure; |
| 2373 | if (likely(afinfo->garbage_collect == NULL)) |
| 2374 | afinfo->garbage_collect = __xfrm_garbage_collect; |
| 2375 | xfrm_policy_afinfo[afinfo->family] = afinfo; |
| 2376 | } |
| 2377 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
| 2378 | |
| 2379 | rtnl_lock(); |
| 2380 | for_each_net(net) { |
| 2381 | struct dst_ops *xfrm_dst_ops; |
| 2382 | |
| 2383 | switch (afinfo->family) { |
| 2384 | case AF_INET: |
| 2385 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; |
| 2386 | break; |
| 2387 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 2388 | case AF_INET6: |
| 2389 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; |
| 2390 | break; |
| 2391 | #endif |
| 2392 | default: |
| 2393 | BUG(); |
| 2394 | } |
| 2395 | *xfrm_dst_ops = *afinfo->dst_ops; |
| 2396 | } |
| 2397 | rtnl_unlock(); |
| 2398 | |
| 2399 | return err; |
| 2400 | } |
| 2401 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); |
| 2402 | |
| 2403 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2404 | { |
| 2405 | int err = 0; |
| 2406 | if (unlikely(afinfo == NULL)) |
| 2407 | return -EINVAL; |
| 2408 | if (unlikely(afinfo->family >= NPROTO)) |
| 2409 | return -EAFNOSUPPORT; |
| 2410 | write_lock_bh(&xfrm_policy_afinfo_lock); |
| 2411 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
| 2412 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) |
| 2413 | err = -EINVAL; |
| 2414 | else { |
| 2415 | struct dst_ops *dst_ops = afinfo->dst_ops; |
| 2416 | xfrm_policy_afinfo[afinfo->family] = NULL; |
| 2417 | dst_ops->kmem_cachep = NULL; |
| 2418 | dst_ops->check = NULL; |
| 2419 | dst_ops->negative_advice = NULL; |
| 2420 | dst_ops->link_failure = NULL; |
| 2421 | afinfo->garbage_collect = NULL; |
| 2422 | } |
| 2423 | } |
| 2424 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
| 2425 | return err; |
| 2426 | } |
| 2427 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); |
| 2428 | |
| 2429 | static void __net_init xfrm_dst_ops_init(struct net *net) |
| 2430 | { |
| 2431 | struct xfrm_policy_afinfo *afinfo; |
| 2432 | |
| 2433 | read_lock_bh(&xfrm_policy_afinfo_lock); |
| 2434 | afinfo = xfrm_policy_afinfo[AF_INET]; |
| 2435 | if (afinfo) |
| 2436 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; |
| 2437 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 2438 | afinfo = xfrm_policy_afinfo[AF_INET6]; |
| 2439 | if (afinfo) |
| 2440 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; |
| 2441 | #endif |
| 2442 | read_unlock_bh(&xfrm_policy_afinfo_lock); |
| 2443 | } |
| 2444 | |
| 2445 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
| 2446 | { |
| 2447 | struct xfrm_policy_afinfo *afinfo; |
| 2448 | if (unlikely(family >= NPROTO)) |
| 2449 | return NULL; |
| 2450 | read_lock(&xfrm_policy_afinfo_lock); |
| 2451 | afinfo = xfrm_policy_afinfo[family]; |
| 2452 | if (unlikely(!afinfo)) |
| 2453 | read_unlock(&xfrm_policy_afinfo_lock); |
| 2454 | return afinfo; |
| 2455 | } |
| 2456 | |
| 2457 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) |
| 2458 | { |
| 2459 | read_unlock(&xfrm_policy_afinfo_lock); |
| 2460 | } |
| 2461 | |
| 2462 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 2463 | { |
| 2464 | struct net_device *dev = ptr; |
| 2465 | |
| 2466 | switch (event) { |
| 2467 | case NETDEV_DOWN: |
| 2468 | __xfrm_garbage_collect(dev_net(dev)); |
| 2469 | } |
| 2470 | return NOTIFY_DONE; |
| 2471 | } |
| 2472 | |
| 2473 | static struct notifier_block xfrm_dev_notifier = { |
| 2474 | .notifier_call = xfrm_dev_event, |
| 2475 | }; |
| 2476 | |
| 2477 | #ifdef CONFIG_XFRM_STATISTICS |
| 2478 | static int __net_init xfrm_statistics_init(struct net *net) |
| 2479 | { |
| 2480 | int rv; |
| 2481 | |
| 2482 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
| 2483 | sizeof(struct linux_xfrm_mib), |
| 2484 | __alignof__(struct linux_xfrm_mib)) < 0) |
| 2485 | return -ENOMEM; |
| 2486 | rv = xfrm_proc_init(net); |
| 2487 | if (rv < 0) |
| 2488 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
| 2489 | return rv; |
| 2490 | } |
| 2491 | |
| 2492 | static void xfrm_statistics_fini(struct net *net) |
| 2493 | { |
| 2494 | xfrm_proc_fini(net); |
| 2495 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
| 2496 | } |
| 2497 | #else |
| 2498 | static int __net_init xfrm_statistics_init(struct net *net) |
| 2499 | { |
| 2500 | return 0; |
| 2501 | } |
| 2502 | |
| 2503 | static void xfrm_statistics_fini(struct net *net) |
| 2504 | { |
| 2505 | } |
| 2506 | #endif |
| 2507 | |
| 2508 | static int __net_init xfrm_policy_init(struct net *net) |
| 2509 | { |
| 2510 | unsigned int hmask, sz; |
| 2511 | int dir; |
| 2512 | |
| 2513 | if (net_eq(net, &init_net)) |
| 2514 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
| 2515 | sizeof(struct xfrm_dst), |
| 2516 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
| 2517 | NULL); |
| 2518 | |
| 2519 | hmask = 8 - 1; |
| 2520 | sz = (hmask+1) * sizeof(struct hlist_head); |
| 2521 | |
| 2522 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
| 2523 | if (!net->xfrm.policy_byidx) |
| 2524 | goto out_byidx; |
| 2525 | net->xfrm.policy_idx_hmask = hmask; |
| 2526 | |
| 2527 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 2528 | struct xfrm_policy_hash *htab; |
| 2529 | |
| 2530 | net->xfrm.policy_count[dir] = 0; |
| 2531 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
| 2532 | |
| 2533 | htab = &net->xfrm.policy_bydst[dir]; |
| 2534 | htab->table = xfrm_hash_alloc(sz); |
| 2535 | if (!htab->table) |
| 2536 | goto out_bydst; |
| 2537 | htab->hmask = hmask; |
| 2538 | } |
| 2539 | |
| 2540 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
| 2541 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
| 2542 | if (net_eq(net, &init_net)) |
| 2543 | register_netdevice_notifier(&xfrm_dev_notifier); |
| 2544 | return 0; |
| 2545 | |
| 2546 | out_bydst: |
| 2547 | for (dir--; dir >= 0; dir--) { |
| 2548 | struct xfrm_policy_hash *htab; |
| 2549 | |
| 2550 | htab = &net->xfrm.policy_bydst[dir]; |
| 2551 | xfrm_hash_free(htab->table, sz); |
| 2552 | } |
| 2553 | xfrm_hash_free(net->xfrm.policy_byidx, sz); |
| 2554 | out_byidx: |
| 2555 | return -ENOMEM; |
| 2556 | } |
| 2557 | |
| 2558 | static void xfrm_policy_fini(struct net *net) |
| 2559 | { |
| 2560 | struct xfrm_audit audit_info; |
| 2561 | unsigned int sz; |
| 2562 | int dir; |
| 2563 | |
| 2564 | flush_work(&net->xfrm.policy_hash_work); |
| 2565 | #ifdef CONFIG_XFRM_SUB_POLICY |
| 2566 | audit_info.loginuid = -1; |
| 2567 | audit_info.sessionid = -1; |
| 2568 | audit_info.secid = 0; |
| 2569 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); |
| 2570 | #endif |
| 2571 | audit_info.loginuid = -1; |
| 2572 | audit_info.sessionid = -1; |
| 2573 | audit_info.secid = 0; |
| 2574 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); |
| 2575 | |
| 2576 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
| 2577 | |
| 2578 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
| 2579 | struct xfrm_policy_hash *htab; |
| 2580 | |
| 2581 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
| 2582 | |
| 2583 | htab = &net->xfrm.policy_bydst[dir]; |
| 2584 | sz = (htab->hmask + 1); |
| 2585 | WARN_ON(!hlist_empty(htab->table)); |
| 2586 | xfrm_hash_free(htab->table, sz); |
| 2587 | } |
| 2588 | |
| 2589 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
| 2590 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
| 2591 | xfrm_hash_free(net->xfrm.policy_byidx, sz); |
| 2592 | } |
| 2593 | |
| 2594 | static int __net_init xfrm_net_init(struct net *net) |
| 2595 | { |
| 2596 | int rv; |
| 2597 | |
| 2598 | rv = xfrm_statistics_init(net); |
| 2599 | if (rv < 0) |
| 2600 | goto out_statistics; |
| 2601 | rv = xfrm_state_init(net); |
| 2602 | if (rv < 0) |
| 2603 | goto out_state; |
| 2604 | rv = xfrm_policy_init(net); |
| 2605 | if (rv < 0) |
| 2606 | goto out_policy; |
| 2607 | xfrm_dst_ops_init(net); |
| 2608 | rv = xfrm_sysctl_init(net); |
| 2609 | if (rv < 0) |
| 2610 | goto out_sysctl; |
| 2611 | return 0; |
| 2612 | |
| 2613 | out_sysctl: |
| 2614 | xfrm_policy_fini(net); |
| 2615 | out_policy: |
| 2616 | xfrm_state_fini(net); |
| 2617 | out_state: |
| 2618 | xfrm_statistics_fini(net); |
| 2619 | out_statistics: |
| 2620 | return rv; |
| 2621 | } |
| 2622 | |
| 2623 | static void __net_exit xfrm_net_exit(struct net *net) |
| 2624 | { |
| 2625 | xfrm_sysctl_fini(net); |
| 2626 | xfrm_policy_fini(net); |
| 2627 | xfrm_state_fini(net); |
| 2628 | xfrm_statistics_fini(net); |
| 2629 | } |
| 2630 | |
| 2631 | static struct pernet_operations __net_initdata xfrm_net_ops = { |
| 2632 | .init = xfrm_net_init, |
| 2633 | .exit = xfrm_net_exit, |
| 2634 | }; |
| 2635 | |
| 2636 | void __init xfrm_init(void) |
| 2637 | { |
| 2638 | register_pernet_subsys(&xfrm_net_ops); |
| 2639 | xfrm_input_init(); |
| 2640 | } |
| 2641 | |
| 2642 | #ifdef CONFIG_AUDITSYSCALL |
| 2643 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
| 2644 | struct audit_buffer *audit_buf) |
| 2645 | { |
| 2646 | struct xfrm_sec_ctx *ctx = xp->security; |
| 2647 | struct xfrm_selector *sel = &xp->selector; |
| 2648 | |
| 2649 | if (ctx) |
| 2650 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
| 2651 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
| 2652 | |
| 2653 | switch(sel->family) { |
| 2654 | case AF_INET: |
| 2655 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
| 2656 | if (sel->prefixlen_s != 32) |
| 2657 | audit_log_format(audit_buf, " src_prefixlen=%d", |
| 2658 | sel->prefixlen_s); |
| 2659 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
| 2660 | if (sel->prefixlen_d != 32) |
| 2661 | audit_log_format(audit_buf, " dst_prefixlen=%d", |
| 2662 | sel->prefixlen_d); |
| 2663 | break; |
| 2664 | case AF_INET6: |
| 2665 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
| 2666 | if (sel->prefixlen_s != 128) |
| 2667 | audit_log_format(audit_buf, " src_prefixlen=%d", |
| 2668 | sel->prefixlen_s); |
| 2669 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
| 2670 | if (sel->prefixlen_d != 128) |
| 2671 | audit_log_format(audit_buf, " dst_prefixlen=%d", |
| 2672 | sel->prefixlen_d); |
| 2673 | break; |
| 2674 | } |
| 2675 | } |
| 2676 | |
| 2677 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
| 2678 | uid_t auid, u32 sessionid, u32 secid) |
| 2679 | { |
| 2680 | struct audit_buffer *audit_buf; |
| 2681 | |
| 2682 | audit_buf = xfrm_audit_start("SPD-add"); |
| 2683 | if (audit_buf == NULL) |
| 2684 | return; |
| 2685 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
| 2686 | audit_log_format(audit_buf, " res=%u", result); |
| 2687 | xfrm_audit_common_policyinfo(xp, audit_buf); |
| 2688 | audit_log_end(audit_buf); |
| 2689 | } |
| 2690 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); |
| 2691 | |
| 2692 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
| 2693 | uid_t auid, u32 sessionid, u32 secid) |
| 2694 | { |
| 2695 | struct audit_buffer *audit_buf; |
| 2696 | |
| 2697 | audit_buf = xfrm_audit_start("SPD-delete"); |
| 2698 | if (audit_buf == NULL) |
| 2699 | return; |
| 2700 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
| 2701 | audit_log_format(audit_buf, " res=%u", result); |
| 2702 | xfrm_audit_common_policyinfo(xp, audit_buf); |
| 2703 | audit_log_end(audit_buf); |
| 2704 | } |
| 2705 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); |
| 2706 | #endif |
| 2707 | |
| 2708 | #ifdef CONFIG_XFRM_MIGRATE |
| 2709 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, |
| 2710 | struct xfrm_selector *sel_tgt) |
| 2711 | { |
| 2712 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { |
| 2713 | if (sel_tgt->family == sel_cmp->family && |
| 2714 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, |
| 2715 | sel_cmp->family) == 0 && |
| 2716 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
| 2717 | sel_cmp->family) == 0 && |
| 2718 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
| 2719 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { |
| 2720 | return 1; |
| 2721 | } |
| 2722 | } else { |
| 2723 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { |
| 2724 | return 1; |
| 2725 | } |
| 2726 | } |
| 2727 | return 0; |
| 2728 | } |
| 2729 | |
| 2730 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, |
| 2731 | u8 dir, u8 type) |
| 2732 | { |
| 2733 | struct xfrm_policy *pol, *ret = NULL; |
| 2734 | struct hlist_node *entry; |
| 2735 | struct hlist_head *chain; |
| 2736 | u32 priority = ~0U; |
| 2737 | |
| 2738 | read_lock_bh(&xfrm_policy_lock); |
| 2739 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
| 2740 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2741 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2742 | pol->type == type) { |
| 2743 | ret = pol; |
| 2744 | priority = ret->priority; |
| 2745 | break; |
| 2746 | } |
| 2747 | } |
| 2748 | chain = &init_net.xfrm.policy_inexact[dir]; |
| 2749 | hlist_for_each_entry(pol, entry, chain, bydst) { |
| 2750 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| 2751 | pol->type == type && |
| 2752 | pol->priority < priority) { |
| 2753 | ret = pol; |
| 2754 | break; |
| 2755 | } |
| 2756 | } |
| 2757 | |
| 2758 | if (ret) |
| 2759 | xfrm_pol_hold(ret); |
| 2760 | |
| 2761 | read_unlock_bh(&xfrm_policy_lock); |
| 2762 | |
| 2763 | return ret; |
| 2764 | } |
| 2765 | |
| 2766 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) |
| 2767 | { |
| 2768 | int match = 0; |
| 2769 | |
| 2770 | if (t->mode == m->mode && t->id.proto == m->proto && |
| 2771 | (m->reqid == 0 || t->reqid == m->reqid)) { |
| 2772 | switch (t->mode) { |
| 2773 | case XFRM_MODE_TUNNEL: |
| 2774 | case XFRM_MODE_BEET: |
| 2775 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, |
| 2776 | m->old_family) == 0 && |
| 2777 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, |
| 2778 | m->old_family) == 0) { |
| 2779 | match = 1; |
| 2780 | } |
| 2781 | break; |
| 2782 | case XFRM_MODE_TRANSPORT: |
| 2783 | /* in case of transport mode, template does not store |
| 2784 | any IP addresses, hence we just compare mode and |
| 2785 | protocol */ |
| 2786 | match = 1; |
| 2787 | break; |
| 2788 | default: |
| 2789 | break; |
| 2790 | } |
| 2791 | } |
| 2792 | return match; |
| 2793 | } |
| 2794 | |
| 2795 | /* update endpoint address(es) of template(s) */ |
| 2796 | static int xfrm_policy_migrate(struct xfrm_policy *pol, |
| 2797 | struct xfrm_migrate *m, int num_migrate) |
| 2798 | { |
| 2799 | struct xfrm_migrate *mp; |
| 2800 | int i, j, n = 0; |
| 2801 | |
| 2802 | write_lock_bh(&pol->lock); |
| 2803 | if (unlikely(pol->walk.dead)) { |
| 2804 | /* target policy has been deleted */ |
| 2805 | write_unlock_bh(&pol->lock); |
| 2806 | return -ENOENT; |
| 2807 | } |
| 2808 | |
| 2809 | for (i = 0; i < pol->xfrm_nr; i++) { |
| 2810 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { |
| 2811 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) |
| 2812 | continue; |
| 2813 | n++; |
| 2814 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
| 2815 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) |
| 2816 | continue; |
| 2817 | /* update endpoints */ |
| 2818 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, |
| 2819 | sizeof(pol->xfrm_vec[i].id.daddr)); |
| 2820 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, |
| 2821 | sizeof(pol->xfrm_vec[i].saddr)); |
| 2822 | pol->xfrm_vec[i].encap_family = mp->new_family; |
| 2823 | /* flush bundles */ |
| 2824 | atomic_inc(&pol->genid); |
| 2825 | } |
| 2826 | } |
| 2827 | |
| 2828 | write_unlock_bh(&pol->lock); |
| 2829 | |
| 2830 | if (!n) |
| 2831 | return -ENODATA; |
| 2832 | |
| 2833 | return 0; |
| 2834 | } |
| 2835 | |
| 2836 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) |
| 2837 | { |
| 2838 | int i, j; |
| 2839 | |
| 2840 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) |
| 2841 | return -EINVAL; |
| 2842 | |
| 2843 | for (i = 0; i < num_migrate; i++) { |
| 2844 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, |
| 2845 | m[i].old_family) == 0) && |
| 2846 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, |
| 2847 | m[i].old_family) == 0)) |
| 2848 | return -EINVAL; |
| 2849 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || |
| 2850 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) |
| 2851 | return -EINVAL; |
| 2852 | |
| 2853 | /* check if there is any duplicated entry */ |
| 2854 | for (j = i + 1; j < num_migrate; j++) { |
| 2855 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, |
| 2856 | sizeof(m[i].old_daddr)) && |
| 2857 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, |
| 2858 | sizeof(m[i].old_saddr)) && |
| 2859 | m[i].proto == m[j].proto && |
| 2860 | m[i].mode == m[j].mode && |
| 2861 | m[i].reqid == m[j].reqid && |
| 2862 | m[i].old_family == m[j].old_family) |
| 2863 | return -EINVAL; |
| 2864 | } |
| 2865 | } |
| 2866 | |
| 2867 | return 0; |
| 2868 | } |
| 2869 | |
| 2870 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
| 2871 | struct xfrm_migrate *m, int num_migrate, |
| 2872 | struct xfrm_kmaddress *k) |
| 2873 | { |
| 2874 | int i, err, nx_cur = 0, nx_new = 0; |
| 2875 | struct xfrm_policy *pol = NULL; |
| 2876 | struct xfrm_state *x, *xc; |
| 2877 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; |
| 2878 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; |
| 2879 | struct xfrm_migrate *mp; |
| 2880 | |
| 2881 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) |
| 2882 | goto out; |
| 2883 | |
| 2884 | /* Stage 1 - find policy */ |
| 2885 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { |
| 2886 | err = -ENOENT; |
| 2887 | goto out; |
| 2888 | } |
| 2889 | |
| 2890 | /* Stage 2 - find and update state(s) */ |
| 2891 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { |
| 2892 | if ((x = xfrm_migrate_state_find(mp))) { |
| 2893 | x_cur[nx_cur] = x; |
| 2894 | nx_cur++; |
| 2895 | if ((xc = xfrm_state_migrate(x, mp))) { |
| 2896 | x_new[nx_new] = xc; |
| 2897 | nx_new++; |
| 2898 | } else { |
| 2899 | err = -ENODATA; |
| 2900 | goto restore_state; |
| 2901 | } |
| 2902 | } |
| 2903 | } |
| 2904 | |
| 2905 | /* Stage 3 - update policy */ |
| 2906 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) |
| 2907 | goto restore_state; |
| 2908 | |
| 2909 | /* Stage 4 - delete old state(s) */ |
| 2910 | if (nx_cur) { |
| 2911 | xfrm_states_put(x_cur, nx_cur); |
| 2912 | xfrm_states_delete(x_cur, nx_cur); |
| 2913 | } |
| 2914 | |
| 2915 | /* Stage 5 - announce */ |
| 2916 | km_migrate(sel, dir, type, m, num_migrate, k); |
| 2917 | |
| 2918 | xfrm_pol_put(pol); |
| 2919 | |
| 2920 | return 0; |
| 2921 | out: |
| 2922 | return err; |
| 2923 | |
| 2924 | restore_state: |
| 2925 | if (pol) |
| 2926 | xfrm_pol_put(pol); |
| 2927 | if (nx_cur) |
| 2928 | xfrm_states_put(x_cur, nx_cur); |
| 2929 | if (nx_new) |
| 2930 | xfrm_states_delete(x_new, nx_new); |
| 2931 | |
| 2932 | return err; |
| 2933 | } |
| 2934 | EXPORT_SYMBOL(xfrm_migrate); |
| 2935 | #endif |