1 /* 2 * xfrm_state.c 3 * 4 * Changes: 5 * Mitsuru KANDA @USAGI 6 * Kazunori MIYAZAWA @USAGI 7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 8 * IPv6 support 9 * YOSHIFUJI Hideaki @USAGI 10 * Split up af-specific functions 11 * Derek Atkins <derek@ihtfp.com> 12 * Add UDP Encapsulation 13 * 14 */ 15 16 #include <linux/workqueue.h> 17 #include <net/xfrm.h> 18 #include <linux/pfkeyv2.h> 19 #include <linux/ipsec.h> 20 #include <linux/module.h> 21 #include <linux/cache.h> 22 #include <linux/audit.h> 23 #include <linux/uaccess.h> 24 #include <linux/ktime.h> 25 #include <linux/slab.h> 26 #include <linux/interrupt.h> 27 #include <linux/kernel.h> 28 29 #include "xfrm_hash.h" 30 31 #define xfrm_state_deref_prot(table, net) \ 32 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) 33 34 static void xfrm_state_gc_task(struct work_struct *work); 35 36 /* Each xfrm_state may be linked to two tables: 37 38 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) 39 2. Hash table by (daddr,family,reqid) to find what SAs exist for given 40 destination/tunnel endpoint. (output) 41 */ 42 43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation); 45 static struct kmem_cache *xfrm_state_cache __ro_after_init; 46 47 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); 48 static HLIST_HEAD(xfrm_state_gc_list); 49 50 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) 51 { 52 return refcount_inc_not_zero(&x->refcnt); 53 } 54 55 static inline unsigned int xfrm_dst_hash(struct net *net, 56 const xfrm_address_t *daddr, 57 const xfrm_address_t *saddr, 58 u32 reqid, 59 unsigned short family) 60 { 61 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 62 } 63 64 static inline unsigned int xfrm_src_hash(struct net *net, 65 const xfrm_address_t *daddr, 66 const xfrm_address_t *saddr, 67 unsigned short family) 68 { 69 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 70 } 71 72 static inline unsigned int 73 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 74 __be32 spi, u8 proto, unsigned short family) 75 { 76 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 77 } 78 79 static void xfrm_hash_transfer(struct hlist_head *list, 80 struct hlist_head *ndsttable, 81 struct hlist_head *nsrctable, 82 struct hlist_head *nspitable, 83 unsigned int nhashmask) 84 { 85 struct hlist_node *tmp; 86 struct xfrm_state *x; 87 88 hlist_for_each_entry_safe(x, tmp, list, bydst) { 89 unsigned int h; 90 91 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 92 x->props.reqid, x->props.family, 93 nhashmask); 94 hlist_add_head_rcu(&x->bydst, ndsttable + h); 95 96 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 97 x->props.family, 98 nhashmask); 99 hlist_add_head_rcu(&x->bysrc, nsrctable + h); 100 101 if (x->id.spi) { 102 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 103 x->id.proto, x->props.family, 104 nhashmask); 105 hlist_add_head_rcu(&x->byspi, nspitable + h); 106 } 107 } 108 } 109 110 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 111 { 112 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 113 } 114 115 static void xfrm_hash_resize(struct work_struct *work) 116 { 117 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 118 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 119 unsigned long nsize, osize; 120 unsigned int nhashmask, ohashmask; 121 int i; 122 123 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 124 ndst = xfrm_hash_alloc(nsize); 125 if (!ndst) 126 return; 127 nsrc = xfrm_hash_alloc(nsize); 128 if (!nsrc) { 129 xfrm_hash_free(ndst, nsize); 130 return; 131 } 132 nspi = xfrm_hash_alloc(nsize); 133 if (!nspi) { 134 xfrm_hash_free(ndst, nsize); 135 xfrm_hash_free(nsrc, nsize); 136 return; 137 } 138 139 spin_lock_bh(&net->xfrm.xfrm_state_lock); 140 write_seqcount_begin(&xfrm_state_hash_generation); 141 142 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 143 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); 144 for (i = net->xfrm.state_hmask; i >= 0; i--) 145 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask); 146 147 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); 148 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); 149 ohashmask = net->xfrm.state_hmask; 150 151 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 152 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 153 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 154 net->xfrm.state_hmask = nhashmask; 155 156 write_seqcount_end(&xfrm_state_hash_generation); 157 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 158 159 osize = (ohashmask + 1) * sizeof(struct hlist_head); 160 161 synchronize_rcu(); 162 163 xfrm_hash_free(odst, osize); 164 xfrm_hash_free(osrc, osize); 165 xfrm_hash_free(ospi, osize); 166 } 167 168 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 169 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 170 171 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 172 173 int __xfrm_state_delete(struct xfrm_state *x); 174 175 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 176 bool km_is_alive(const struct km_event *c); 177 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 178 179 static DEFINE_SPINLOCK(xfrm_type_lock); 180 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 181 { 182 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 183 const struct xfrm_type **typemap; 184 int err = 0; 185 186 if (unlikely(afinfo == NULL)) 187 return -EAFNOSUPPORT; 188 typemap = afinfo->type_map; 189 spin_lock_bh(&xfrm_type_lock); 190 191 if (likely(typemap[type->proto] == NULL)) 192 typemap[type->proto] = type; 193 else 194 err = -EEXIST; 195 spin_unlock_bh(&xfrm_type_lock); 196 rcu_read_unlock(); 197 return err; 198 } 199 EXPORT_SYMBOL(xfrm_register_type); 200 201 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 202 { 203 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 204 const struct xfrm_type **typemap; 205 int err = 0; 206 207 if (unlikely(afinfo == NULL)) 208 return -EAFNOSUPPORT; 209 typemap = afinfo->type_map; 210 spin_lock_bh(&xfrm_type_lock); 211 212 if (unlikely(typemap[type->proto] != type)) 213 err = -ENOENT; 214 else 215 typemap[type->proto] = NULL; 216 spin_unlock_bh(&xfrm_type_lock); 217 rcu_read_unlock(); 218 return err; 219 } 220 EXPORT_SYMBOL(xfrm_unregister_type); 221 222 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 223 { 224 struct xfrm_state_afinfo *afinfo; 225 const struct xfrm_type **typemap; 226 const struct xfrm_type *type; 227 int modload_attempted = 0; 228 229 retry: 230 afinfo = xfrm_state_get_afinfo(family); 231 if (unlikely(afinfo == NULL)) 232 return NULL; 233 typemap = afinfo->type_map; 234 235 type = READ_ONCE(typemap[proto]); 236 if (unlikely(type && !try_module_get(type->owner))) 237 type = NULL; 238 239 rcu_read_unlock(); 240 241 if (!type && !modload_attempted) { 242 request_module("xfrm-type-%d-%d", family, proto); 243 modload_attempted = 1; 244 goto retry; 245 } 246 247 return type; 248 } 249 250 static void xfrm_put_type(const struct xfrm_type *type) 251 { 252 module_put(type->owner); 253 } 254 255 static DEFINE_SPINLOCK(xfrm_type_offload_lock); 256 int xfrm_register_type_offload(const struct xfrm_type_offload *type, 257 unsigned short family) 258 { 259 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 260 const struct xfrm_type_offload **typemap; 261 int err = 0; 262 263 if (unlikely(afinfo == NULL)) 264 return -EAFNOSUPPORT; 265 typemap = afinfo->type_offload_map; 266 spin_lock_bh(&xfrm_type_offload_lock); 267 268 if (likely(typemap[type->proto] == NULL)) 269 typemap[type->proto] = type; 270 else 271 err = -EEXIST; 272 spin_unlock_bh(&xfrm_type_offload_lock); 273 rcu_read_unlock(); 274 return err; 275 } 276 EXPORT_SYMBOL(xfrm_register_type_offload); 277 278 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, 279 unsigned short family) 280 { 281 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 282 const struct xfrm_type_offload **typemap; 283 int err = 0; 284 285 if (unlikely(afinfo == NULL)) 286 return -EAFNOSUPPORT; 287 typemap = afinfo->type_offload_map; 288 spin_lock_bh(&xfrm_type_offload_lock); 289 290 if (unlikely(typemap[type->proto] != type)) 291 err = -ENOENT; 292 else 293 typemap[type->proto] = NULL; 294 spin_unlock_bh(&xfrm_type_offload_lock); 295 rcu_read_unlock(); 296 return err; 297 } 298 EXPORT_SYMBOL(xfrm_unregister_type_offload); 299 300 static const struct xfrm_type_offload * 301 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load) 302 { 303 struct xfrm_state_afinfo *afinfo; 304 const struct xfrm_type_offload **typemap; 305 const struct xfrm_type_offload *type; 306 307 retry: 308 afinfo = xfrm_state_get_afinfo(family); 309 if (unlikely(afinfo == NULL)) 310 return NULL; 311 typemap = afinfo->type_offload_map; 312 313 type = typemap[proto]; 314 if ((type && !try_module_get(type->owner))) 315 type = NULL; 316 317 rcu_read_unlock(); 318 319 if (!type && try_load) { 320 request_module("xfrm-offload-%d-%d", family, proto); 321 try_load = false; 322 goto retry; 323 } 324 325 return type; 326 } 327 328 static void xfrm_put_type_offload(const struct xfrm_type_offload *type) 329 { 330 module_put(type->owner); 331 } 332 333 static DEFINE_SPINLOCK(xfrm_mode_lock); 334 int xfrm_register_mode(struct xfrm_mode *mode, int family) 335 { 336 struct xfrm_state_afinfo *afinfo; 337 struct xfrm_mode **modemap; 338 int err; 339 340 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 341 return -EINVAL; 342 343 afinfo = xfrm_state_get_afinfo(family); 344 if (unlikely(afinfo == NULL)) 345 return -EAFNOSUPPORT; 346 347 err = -EEXIST; 348 modemap = afinfo->mode_map; 349 spin_lock_bh(&xfrm_mode_lock); 350 if (modemap[mode->encap]) 351 goto out; 352 353 err = -ENOENT; 354 if (!try_module_get(afinfo->owner)) 355 goto out; 356 357 mode->afinfo = afinfo; 358 modemap[mode->encap] = mode; 359 err = 0; 360 361 out: 362 spin_unlock_bh(&xfrm_mode_lock); 363 rcu_read_unlock(); 364 return err; 365 } 366 EXPORT_SYMBOL(xfrm_register_mode); 367 368 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 369 { 370 struct xfrm_state_afinfo *afinfo; 371 struct xfrm_mode **modemap; 372 int err; 373 374 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 375 return -EINVAL; 376 377 afinfo = xfrm_state_get_afinfo(family); 378 if (unlikely(afinfo == NULL)) 379 return -EAFNOSUPPORT; 380 381 err = -ENOENT; 382 modemap = afinfo->mode_map; 383 spin_lock_bh(&xfrm_mode_lock); 384 if (likely(modemap[mode->encap] == mode)) { 385 modemap[mode->encap] = NULL; 386 module_put(mode->afinfo->owner); 387 err = 0; 388 } 389 390 spin_unlock_bh(&xfrm_mode_lock); 391 rcu_read_unlock(); 392 return err; 393 } 394 EXPORT_SYMBOL(xfrm_unregister_mode); 395 396 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 397 { 398 struct xfrm_state_afinfo *afinfo; 399 struct xfrm_mode *mode; 400 int modload_attempted = 0; 401 402 if (unlikely(encap >= XFRM_MODE_MAX)) 403 return NULL; 404 405 retry: 406 afinfo = xfrm_state_get_afinfo(family); 407 if (unlikely(afinfo == NULL)) 408 return NULL; 409 410 mode = READ_ONCE(afinfo->mode_map[encap]); 411 if (unlikely(mode && !try_module_get(mode->owner))) 412 mode = NULL; 413 414 rcu_read_unlock(); 415 if (!mode && !modload_attempted) { 416 request_module("xfrm-mode-%d-%d", family, encap); 417 modload_attempted = 1; 418 goto retry; 419 } 420 421 return mode; 422 } 423 424 static void xfrm_put_mode(struct xfrm_mode *mode) 425 { 426 module_put(mode->owner); 427 } 428 429 void xfrm_state_free(struct xfrm_state *x) 430 { 431 kmem_cache_free(xfrm_state_cache, x); 432 } 433 EXPORT_SYMBOL(xfrm_state_free); 434 435 static void xfrm_state_gc_destroy(struct xfrm_state *x) 436 { 437 tasklet_hrtimer_cancel(&x->mtimer); 438 del_timer_sync(&x->rtimer); 439 kfree(x->aead); 440 kfree(x->aalg); 441 kfree(x->ealg); 442 kfree(x->calg); 443 kfree(x->encap); 444 kfree(x->coaddr); 445 kfree(x->replay_esn); 446 kfree(x->preplay_esn); 447 if (x->inner_mode) 448 xfrm_put_mode(x->inner_mode); 449 if (x->inner_mode_iaf) 450 xfrm_put_mode(x->inner_mode_iaf); 451 if (x->outer_mode) 452 xfrm_put_mode(x->outer_mode); 453 if (x->type_offload) 454 xfrm_put_type_offload(x->type_offload); 455 if (x->type) { 456 x->type->destructor(x); 457 xfrm_put_type(x->type); 458 } 459 xfrm_dev_state_free(x); 460 security_xfrm_state_free(x); 461 xfrm_state_free(x); 462 } 463 464 static void xfrm_state_gc_task(struct work_struct *work) 465 { 466 struct xfrm_state *x; 467 struct hlist_node *tmp; 468 struct hlist_head gc_list; 469 470 spin_lock_bh(&xfrm_state_gc_lock); 471 hlist_move_list(&xfrm_state_gc_list, &gc_list); 472 spin_unlock_bh(&xfrm_state_gc_lock); 473 474 synchronize_rcu(); 475 476 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 477 xfrm_state_gc_destroy(x); 478 } 479 480 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 481 { 482 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 483 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 484 time64_t now = ktime_get_real_seconds(); 485 time64_t next = TIME64_MAX; 486 int warn = 0; 487 int err = 0; 488 489 spin_lock(&x->lock); 490 if (x->km.state == XFRM_STATE_DEAD) 491 goto out; 492 if (x->km.state == XFRM_STATE_EXPIRED) 493 goto expired; 494 if (x->lft.hard_add_expires_seconds) { 495 long tmo = x->lft.hard_add_expires_seconds + 496 x->curlft.add_time - now; 497 if (tmo <= 0) { 498 if (x->xflags & XFRM_SOFT_EXPIRE) { 499 /* enter hard expire without soft expire first?! 500 * setting a new date could trigger this. 501 * workaround: fix x->curflt.add_time by below: 502 */ 503 x->curlft.add_time = now - x->saved_tmo - 1; 504 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 505 } else 506 goto expired; 507 } 508 if (tmo < next) 509 next = tmo; 510 } 511 if (x->lft.hard_use_expires_seconds) { 512 long tmo = x->lft.hard_use_expires_seconds + 513 (x->curlft.use_time ? : now) - now; 514 if (tmo <= 0) 515 goto expired; 516 if (tmo < next) 517 next = tmo; 518 } 519 if (x->km.dying) 520 goto resched; 521 if (x->lft.soft_add_expires_seconds) { 522 long tmo = x->lft.soft_add_expires_seconds + 523 x->curlft.add_time - now; 524 if (tmo <= 0) { 525 warn = 1; 526 x->xflags &= ~XFRM_SOFT_EXPIRE; 527 } else if (tmo < next) { 528 next = tmo; 529 x->xflags |= XFRM_SOFT_EXPIRE; 530 x->saved_tmo = tmo; 531 } 532 } 533 if (x->lft.soft_use_expires_seconds) { 534 long tmo = x->lft.soft_use_expires_seconds + 535 (x->curlft.use_time ? : now) - now; 536 if (tmo <= 0) 537 warn = 1; 538 else if (tmo < next) 539 next = tmo; 540 } 541 542 x->km.dying = warn; 543 if (warn) 544 km_state_expired(x, 0, 0); 545 resched: 546 if (next != TIME64_MAX) { 547 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 548 } 549 550 goto out; 551 552 expired: 553 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 554 x->km.state = XFRM_STATE_EXPIRED; 555 556 err = __xfrm_state_delete(x); 557 if (!err) 558 km_state_expired(x, 1, 0); 559 560 xfrm_audit_state_delete(x, err ? 0 : 1, true); 561 562 out: 563 spin_unlock(&x->lock); 564 return HRTIMER_NORESTART; 565 } 566 567 static void xfrm_replay_timer_handler(struct timer_list *t); 568 569 struct xfrm_state *xfrm_state_alloc(struct net *net) 570 { 571 struct xfrm_state *x; 572 573 x = kmem_cache_alloc(xfrm_state_cache, GFP_ATOMIC | __GFP_ZERO); 574 575 if (x) { 576 write_pnet(&x->xs_net, net); 577 refcount_set(&x->refcnt, 1); 578 atomic_set(&x->tunnel_users, 0); 579 INIT_LIST_HEAD(&x->km.all); 580 INIT_HLIST_NODE(&x->bydst); 581 INIT_HLIST_NODE(&x->bysrc); 582 INIT_HLIST_NODE(&x->byspi); 583 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, 584 CLOCK_BOOTTIME, HRTIMER_MODE_ABS); 585 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 586 x->curlft.add_time = ktime_get_real_seconds(); 587 x->lft.soft_byte_limit = XFRM_INF; 588 x->lft.soft_packet_limit = XFRM_INF; 589 x->lft.hard_byte_limit = XFRM_INF; 590 x->lft.hard_packet_limit = XFRM_INF; 591 x->replay_maxage = 0; 592 x->replay_maxdiff = 0; 593 x->inner_mode = NULL; 594 x->inner_mode_iaf = NULL; 595 spin_lock_init(&x->lock); 596 } 597 return x; 598 } 599 EXPORT_SYMBOL(xfrm_state_alloc); 600 601 void __xfrm_state_destroy(struct xfrm_state *x) 602 { 603 WARN_ON(x->km.state != XFRM_STATE_DEAD); 604 605 spin_lock_bh(&xfrm_state_gc_lock); 606 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 607 spin_unlock_bh(&xfrm_state_gc_lock); 608 schedule_work(&xfrm_state_gc_work); 609 } 610 EXPORT_SYMBOL(__xfrm_state_destroy); 611 612 int __xfrm_state_delete(struct xfrm_state *x) 613 { 614 struct net *net = xs_net(x); 615 int err = -ESRCH; 616 617 if (x->km.state != XFRM_STATE_DEAD) { 618 x->km.state = XFRM_STATE_DEAD; 619 spin_lock(&net->xfrm.xfrm_state_lock); 620 list_del(&x->km.all); 621 hlist_del_rcu(&x->bydst); 622 hlist_del_rcu(&x->bysrc); 623 if (x->id.spi) 624 hlist_del_rcu(&x->byspi); 625 net->xfrm.state_num--; 626 spin_unlock(&net->xfrm.xfrm_state_lock); 627 628 xfrm_dev_state_delete(x); 629 630 /* All xfrm_state objects are created by xfrm_state_alloc. 631 * The xfrm_state_alloc call gives a reference, and that 632 * is what we are dropping here. 633 */ 634 xfrm_state_put(x); 635 err = 0; 636 } 637 638 return err; 639 } 640 EXPORT_SYMBOL(__xfrm_state_delete); 641 642 int xfrm_state_delete(struct xfrm_state *x) 643 { 644 int err; 645 646 spin_lock_bh(&x->lock); 647 err = __xfrm_state_delete(x); 648 spin_unlock_bh(&x->lock); 649 650 return err; 651 } 652 EXPORT_SYMBOL(xfrm_state_delete); 653 654 #ifdef CONFIG_SECURITY_NETWORK_XFRM 655 static inline int 656 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 657 { 658 int i, err = 0; 659 660 for (i = 0; i <= net->xfrm.state_hmask; i++) { 661 struct xfrm_state *x; 662 663 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 664 if (xfrm_id_proto_match(x->id.proto, proto) && 665 (err = security_xfrm_state_delete(x)) != 0) { 666 xfrm_audit_state_delete(x, 0, task_valid); 667 return err; 668 } 669 } 670 } 671 672 return err; 673 } 674 675 static inline int 676 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 677 { 678 int i, err = 0; 679 680 for (i = 0; i <= net->xfrm.state_hmask; i++) { 681 struct xfrm_state *x; 682 struct xfrm_state_offload *xso; 683 684 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 685 xso = &x->xso; 686 687 if (xso->dev == dev && 688 (err = security_xfrm_state_delete(x)) != 0) { 689 xfrm_audit_state_delete(x, 0, task_valid); 690 return err; 691 } 692 } 693 } 694 695 return err; 696 } 697 #else 698 static inline int 699 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 700 { 701 return 0; 702 } 703 704 static inline int 705 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 706 { 707 return 0; 708 } 709 #endif 710 711 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) 712 { 713 int i, err = 0, cnt = 0; 714 715 spin_lock_bh(&net->xfrm.xfrm_state_lock); 716 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 717 if (err) 718 goto out; 719 720 err = -ESRCH; 721 for (i = 0; i <= net->xfrm.state_hmask; i++) { 722 struct xfrm_state *x; 723 restart: 724 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 725 if (!xfrm_state_kern(x) && 726 xfrm_id_proto_match(x->id.proto, proto)) { 727 xfrm_state_hold(x); 728 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 729 730 err = xfrm_state_delete(x); 731 xfrm_audit_state_delete(x, err ? 0 : 1, 732 task_valid); 733 xfrm_state_put(x); 734 if (!err) 735 cnt++; 736 737 spin_lock_bh(&net->xfrm.xfrm_state_lock); 738 goto restart; 739 } 740 } 741 } 742 out: 743 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 744 if (cnt) 745 err = 0; 746 747 return err; 748 } 749 EXPORT_SYMBOL(xfrm_state_flush); 750 751 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 752 { 753 int i, err = 0, cnt = 0; 754 755 spin_lock_bh(&net->xfrm.xfrm_state_lock); 756 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 757 if (err) 758 goto out; 759 760 err = -ESRCH; 761 for (i = 0; i <= net->xfrm.state_hmask; i++) { 762 struct xfrm_state *x; 763 struct xfrm_state_offload *xso; 764 restart: 765 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 766 xso = &x->xso; 767 768 if (!xfrm_state_kern(x) && xso->dev == dev) { 769 xfrm_state_hold(x); 770 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 771 772 err = xfrm_state_delete(x); 773 xfrm_audit_state_delete(x, err ? 0 : 1, 774 task_valid); 775 xfrm_state_put(x); 776 if (!err) 777 cnt++; 778 779 spin_lock_bh(&net->xfrm.xfrm_state_lock); 780 goto restart; 781 } 782 } 783 } 784 if (cnt) 785 err = 0; 786 787 out: 788 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 789 return err; 790 } 791 EXPORT_SYMBOL(xfrm_dev_state_flush); 792 793 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 794 { 795 spin_lock_bh(&net->xfrm.xfrm_state_lock); 796 si->sadcnt = net->xfrm.state_num; 797 si->sadhcnt = net->xfrm.state_hmask + 1; 798 si->sadhmcnt = xfrm_state_hashmax; 799 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 800 } 801 EXPORT_SYMBOL(xfrm_sad_getinfo); 802 803 static void 804 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 805 const struct xfrm_tmpl *tmpl, 806 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 807 unsigned short family) 808 { 809 struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family); 810 811 if (!afinfo) 812 return; 813 814 afinfo->init_tempsel(&x->sel, fl); 815 816 if (family != tmpl->encap_family) { 817 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family); 818 if (!afinfo) 819 return; 820 } 821 afinfo->init_temprop(x, tmpl, daddr, saddr); 822 } 823 824 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 825 const xfrm_address_t *daddr, 826 __be32 spi, u8 proto, 827 unsigned short family) 828 { 829 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 830 struct xfrm_state *x; 831 832 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { 833 if (x->props.family != family || 834 x->id.spi != spi || 835 x->id.proto != proto || 836 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 837 continue; 838 839 if ((mark & x->mark.m) != x->mark.v) 840 continue; 841 if (!xfrm_state_hold_rcu(x)) 842 continue; 843 return x; 844 } 845 846 return NULL; 847 } 848 849 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 850 const xfrm_address_t *daddr, 851 const xfrm_address_t *saddr, 852 u8 proto, unsigned short family) 853 { 854 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 855 struct xfrm_state *x; 856 857 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { 858 if (x->props.family != family || 859 x->id.proto != proto || 860 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 861 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 862 continue; 863 864 if ((mark & x->mark.m) != x->mark.v) 865 continue; 866 if (!xfrm_state_hold_rcu(x)) 867 continue; 868 return x; 869 } 870 871 return NULL; 872 } 873 874 static inline struct xfrm_state * 875 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 876 { 877 struct net *net = xs_net(x); 878 u32 mark = x->mark.v & x->mark.m; 879 880 if (use_spi) 881 return __xfrm_state_lookup(net, mark, &x->id.daddr, 882 x->id.spi, x->id.proto, family); 883 else 884 return __xfrm_state_lookup_byaddr(net, mark, 885 &x->id.daddr, 886 &x->props.saddr, 887 x->id.proto, family); 888 } 889 890 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 891 { 892 if (have_hash_collision && 893 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 894 net->xfrm.state_num > net->xfrm.state_hmask) 895 schedule_work(&net->xfrm.state_hash_work); 896 } 897 898 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 899 const struct flowi *fl, unsigned short family, 900 struct xfrm_state **best, int *acq_in_progress, 901 int *error) 902 { 903 /* Resolution logic: 904 * 1. There is a valid state with matching selector. Done. 905 * 2. Valid state with inappropriate selector. Skip. 906 * 907 * Entering area of "sysdeps". 908 * 909 * 3. If state is not valid, selector is temporary, it selects 910 * only session which triggered previous resolution. Key 911 * manager will do something to install a state with proper 912 * selector. 913 */ 914 if (x->km.state == XFRM_STATE_VALID) { 915 if ((x->sel.family && 916 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 917 !security_xfrm_state_pol_flow_match(x, pol, fl)) 918 return; 919 920 if (!*best || 921 (*best)->km.dying > x->km.dying || 922 ((*best)->km.dying == x->km.dying && 923 (*best)->curlft.add_time < x->curlft.add_time)) 924 *best = x; 925 } else if (x->km.state == XFRM_STATE_ACQ) { 926 *acq_in_progress = 1; 927 } else if (x->km.state == XFRM_STATE_ERROR || 928 x->km.state == XFRM_STATE_EXPIRED) { 929 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 930 security_xfrm_state_pol_flow_match(x, pol, fl)) 931 *error = -ESRCH; 932 } 933 } 934 935 struct xfrm_state * 936 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 937 const struct flowi *fl, struct xfrm_tmpl *tmpl, 938 struct xfrm_policy *pol, int *err, 939 unsigned short family, u32 if_id) 940 { 941 static xfrm_address_t saddr_wildcard = { }; 942 struct net *net = xp_net(pol); 943 unsigned int h, h_wildcard; 944 struct xfrm_state *x, *x0, *to_put; 945 int acquire_in_progress = 0; 946 int error = 0; 947 struct xfrm_state *best = NULL; 948 u32 mark = pol->mark.v & pol->mark.m; 949 unsigned short encap_family = tmpl->encap_family; 950 unsigned int sequence; 951 struct km_event c; 952 953 to_put = NULL; 954 955 sequence = read_seqcount_begin(&xfrm_state_hash_generation); 956 957 rcu_read_lock(); 958 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 959 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { 960 if (x->props.family == encap_family && 961 x->props.reqid == tmpl->reqid && 962 (mark & x->mark.m) == x->mark.v && 963 x->if_id == if_id && 964 !(x->props.flags & XFRM_STATE_WILDRECV) && 965 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 966 tmpl->mode == x->props.mode && 967 tmpl->id.proto == x->id.proto && 968 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 969 xfrm_state_look_at(pol, x, fl, encap_family, 970 &best, &acquire_in_progress, &error); 971 } 972 if (best || acquire_in_progress) 973 goto found; 974 975 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 976 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { 977 if (x->props.family == encap_family && 978 x->props.reqid == tmpl->reqid && 979 (mark & x->mark.m) == x->mark.v && 980 x->if_id == if_id && 981 !(x->props.flags & XFRM_STATE_WILDRECV) && 982 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 983 tmpl->mode == x->props.mode && 984 tmpl->id.proto == x->id.proto && 985 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 986 xfrm_state_look_at(pol, x, fl, encap_family, 987 &best, &acquire_in_progress, &error); 988 } 989 990 found: 991 x = best; 992 if (!x && !error && !acquire_in_progress) { 993 if (tmpl->id.spi && 994 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 995 tmpl->id.proto, encap_family)) != NULL) { 996 to_put = x0; 997 error = -EEXIST; 998 goto out; 999 } 1000 1001 c.net = net; 1002 /* If the KMs have no listeners (yet...), avoid allocating an SA 1003 * for each and every packet - garbage collection might not 1004 * handle the flood. 1005 */ 1006 if (!km_is_alive(&c)) { 1007 error = -ESRCH; 1008 goto out; 1009 } 1010 1011 x = xfrm_state_alloc(net); 1012 if (x == NULL) { 1013 error = -ENOMEM; 1014 goto out; 1015 } 1016 /* Initialize temporary state matching only 1017 * to current session. */ 1018 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1019 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1020 x->if_id = if_id; 1021 1022 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1023 if (error) { 1024 x->km.state = XFRM_STATE_DEAD; 1025 to_put = x; 1026 x = NULL; 1027 goto out; 1028 } 1029 1030 if (km_query(x, tmpl, pol) == 0) { 1031 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1032 x->km.state = XFRM_STATE_ACQ; 1033 list_add(&x->km.all, &net->xfrm.state_all); 1034 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1035 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1036 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1037 if (x->id.spi) { 1038 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1039 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1040 } 1041 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1042 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1043 net->xfrm.state_num++; 1044 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1045 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1046 } else { 1047 x->km.state = XFRM_STATE_DEAD; 1048 to_put = x; 1049 x = NULL; 1050 error = -ESRCH; 1051 } 1052 } 1053 out: 1054 if (x) { 1055 if (!xfrm_state_hold_rcu(x)) { 1056 *err = -EAGAIN; 1057 x = NULL; 1058 } 1059 } else { 1060 *err = acquire_in_progress ? -EAGAIN : error; 1061 } 1062 rcu_read_unlock(); 1063 if (to_put) 1064 xfrm_state_put(to_put); 1065 1066 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { 1067 *err = -EAGAIN; 1068 if (x) { 1069 xfrm_state_put(x); 1070 x = NULL; 1071 } 1072 } 1073 1074 return x; 1075 } 1076 1077 struct xfrm_state * 1078 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1079 xfrm_address_t *daddr, xfrm_address_t *saddr, 1080 unsigned short family, u8 mode, u8 proto, u32 reqid) 1081 { 1082 unsigned int h; 1083 struct xfrm_state *rx = NULL, *x = NULL; 1084 1085 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1086 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1087 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1088 if (x->props.family == family && 1089 x->props.reqid == reqid && 1090 (mark & x->mark.m) == x->mark.v && 1091 x->if_id == if_id && 1092 !(x->props.flags & XFRM_STATE_WILDRECV) && 1093 xfrm_state_addr_check(x, daddr, saddr, family) && 1094 mode == x->props.mode && 1095 proto == x->id.proto && 1096 x->km.state == XFRM_STATE_VALID) { 1097 rx = x; 1098 break; 1099 } 1100 } 1101 1102 if (rx) 1103 xfrm_state_hold(rx); 1104 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1105 1106 1107 return rx; 1108 } 1109 EXPORT_SYMBOL(xfrm_stateonly_find); 1110 1111 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1112 unsigned short family) 1113 { 1114 struct xfrm_state *x; 1115 struct xfrm_state_walk *w; 1116 1117 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1118 list_for_each_entry(w, &net->xfrm.state_all, all) { 1119 x = container_of(w, struct xfrm_state, km); 1120 if (x->props.family != family || 1121 x->id.spi != spi) 1122 continue; 1123 1124 xfrm_state_hold(x); 1125 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1126 return x; 1127 } 1128 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1129 return NULL; 1130 } 1131 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1132 1133 static void __xfrm_state_insert(struct xfrm_state *x) 1134 { 1135 struct net *net = xs_net(x); 1136 unsigned int h; 1137 1138 list_add(&x->km.all, &net->xfrm.state_all); 1139 1140 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1141 x->props.reqid, x->props.family); 1142 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1143 1144 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1145 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1146 1147 if (x->id.spi) { 1148 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1149 x->props.family); 1150 1151 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1152 } 1153 1154 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1155 if (x->replay_maxage) 1156 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1157 1158 net->xfrm.state_num++; 1159 1160 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1161 } 1162 1163 /* net->xfrm.xfrm_state_lock is held */ 1164 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1165 { 1166 struct net *net = xs_net(xnew); 1167 unsigned short family = xnew->props.family; 1168 u32 reqid = xnew->props.reqid; 1169 struct xfrm_state *x; 1170 unsigned int h; 1171 u32 mark = xnew->mark.v & xnew->mark.m; 1172 u32 if_id = xnew->if_id; 1173 1174 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1175 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1176 if (x->props.family == family && 1177 x->props.reqid == reqid && 1178 x->if_id == if_id && 1179 (mark & x->mark.m) == x->mark.v && 1180 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1181 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1182 x->genid++; 1183 } 1184 } 1185 1186 void xfrm_state_insert(struct xfrm_state *x) 1187 { 1188 struct net *net = xs_net(x); 1189 1190 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1191 __xfrm_state_bump_genids(x); 1192 __xfrm_state_insert(x); 1193 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1194 } 1195 EXPORT_SYMBOL(xfrm_state_insert); 1196 1197 /* net->xfrm.xfrm_state_lock is held */ 1198 static struct xfrm_state *__find_acq_core(struct net *net, 1199 const struct xfrm_mark *m, 1200 unsigned short family, u8 mode, 1201 u32 reqid, u32 if_id, u8 proto, 1202 const xfrm_address_t *daddr, 1203 const xfrm_address_t *saddr, 1204 int create) 1205 { 1206 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1207 struct xfrm_state *x; 1208 u32 mark = m->v & m->m; 1209 1210 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1211 if (x->props.reqid != reqid || 1212 x->props.mode != mode || 1213 x->props.family != family || 1214 x->km.state != XFRM_STATE_ACQ || 1215 x->id.spi != 0 || 1216 x->id.proto != proto || 1217 (mark & x->mark.m) != x->mark.v || 1218 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1219 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1220 continue; 1221 1222 xfrm_state_hold(x); 1223 return x; 1224 } 1225 1226 if (!create) 1227 return NULL; 1228 1229 x = xfrm_state_alloc(net); 1230 if (likely(x)) { 1231 switch (family) { 1232 case AF_INET: 1233 x->sel.daddr.a4 = daddr->a4; 1234 x->sel.saddr.a4 = saddr->a4; 1235 x->sel.prefixlen_d = 32; 1236 x->sel.prefixlen_s = 32; 1237 x->props.saddr.a4 = saddr->a4; 1238 x->id.daddr.a4 = daddr->a4; 1239 break; 1240 1241 case AF_INET6: 1242 x->sel.daddr.in6 = daddr->in6; 1243 x->sel.saddr.in6 = saddr->in6; 1244 x->sel.prefixlen_d = 128; 1245 x->sel.prefixlen_s = 128; 1246 x->props.saddr.in6 = saddr->in6; 1247 x->id.daddr.in6 = daddr->in6; 1248 break; 1249 } 1250 1251 x->km.state = XFRM_STATE_ACQ; 1252 x->id.proto = proto; 1253 x->props.family = family; 1254 x->props.mode = mode; 1255 x->props.reqid = reqid; 1256 x->if_id = if_id; 1257 x->mark.v = m->v; 1258 x->mark.m = m->m; 1259 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1260 xfrm_state_hold(x); 1261 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1262 list_add(&x->km.all, &net->xfrm.state_all); 1263 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1264 h = xfrm_src_hash(net, daddr, saddr, family); 1265 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1266 1267 net->xfrm.state_num++; 1268 1269 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1270 } 1271 1272 return x; 1273 } 1274 1275 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1276 1277 int xfrm_state_add(struct xfrm_state *x) 1278 { 1279 struct net *net = xs_net(x); 1280 struct xfrm_state *x1, *to_put; 1281 int family; 1282 int err; 1283 u32 mark = x->mark.v & x->mark.m; 1284 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1285 1286 family = x->props.family; 1287 1288 to_put = NULL; 1289 1290 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1291 1292 x1 = __xfrm_state_locate(x, use_spi, family); 1293 if (x1) { 1294 to_put = x1; 1295 x1 = NULL; 1296 err = -EEXIST; 1297 goto out; 1298 } 1299 1300 if (use_spi && x->km.seq) { 1301 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1302 if (x1 && ((x1->id.proto != x->id.proto) || 1303 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1304 to_put = x1; 1305 x1 = NULL; 1306 } 1307 } 1308 1309 if (use_spi && !x1) 1310 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1311 x->props.reqid, x->if_id, x->id.proto, 1312 &x->id.daddr, &x->props.saddr, 0); 1313 1314 __xfrm_state_bump_genids(x); 1315 __xfrm_state_insert(x); 1316 err = 0; 1317 1318 out: 1319 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1320 1321 if (x1) { 1322 xfrm_state_delete(x1); 1323 xfrm_state_put(x1); 1324 } 1325 1326 if (to_put) 1327 xfrm_state_put(to_put); 1328 1329 return err; 1330 } 1331 EXPORT_SYMBOL(xfrm_state_add); 1332 1333 #ifdef CONFIG_XFRM_MIGRATE 1334 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1335 struct xfrm_encap_tmpl *encap) 1336 { 1337 struct net *net = xs_net(orig); 1338 struct xfrm_state *x = xfrm_state_alloc(net); 1339 if (!x) 1340 goto out; 1341 1342 memcpy(&x->id, &orig->id, sizeof(x->id)); 1343 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1344 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1345 x->props.mode = orig->props.mode; 1346 x->props.replay_window = orig->props.replay_window; 1347 x->props.reqid = orig->props.reqid; 1348 x->props.family = orig->props.family; 1349 x->props.saddr = orig->props.saddr; 1350 1351 if (orig->aalg) { 1352 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1353 if (!x->aalg) 1354 goto error; 1355 } 1356 x->props.aalgo = orig->props.aalgo; 1357 1358 if (orig->aead) { 1359 x->aead = xfrm_algo_aead_clone(orig->aead); 1360 x->geniv = orig->geniv; 1361 if (!x->aead) 1362 goto error; 1363 } 1364 if (orig->ealg) { 1365 x->ealg = xfrm_algo_clone(orig->ealg); 1366 if (!x->ealg) 1367 goto error; 1368 } 1369 x->props.ealgo = orig->props.ealgo; 1370 1371 if (orig->calg) { 1372 x->calg = xfrm_algo_clone(orig->calg); 1373 if (!x->calg) 1374 goto error; 1375 } 1376 x->props.calgo = orig->props.calgo; 1377 1378 if (encap || orig->encap) { 1379 if (encap) 1380 x->encap = kmemdup(encap, sizeof(*x->encap), 1381 GFP_KERNEL); 1382 else 1383 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1384 GFP_KERNEL); 1385 1386 if (!x->encap) 1387 goto error; 1388 } 1389 1390 if (orig->coaddr) { 1391 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1392 GFP_KERNEL); 1393 if (!x->coaddr) 1394 goto error; 1395 } 1396 1397 if (orig->replay_esn) { 1398 if (xfrm_replay_clone(x, orig)) 1399 goto error; 1400 } 1401 1402 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1403 1404 if (xfrm_init_state(x) < 0) 1405 goto error; 1406 1407 x->props.flags = orig->props.flags; 1408 x->props.extra_flags = orig->props.extra_flags; 1409 1410 x->if_id = orig->if_id; 1411 x->tfcpad = orig->tfcpad; 1412 x->replay_maxdiff = orig->replay_maxdiff; 1413 x->replay_maxage = orig->replay_maxage; 1414 x->curlft.add_time = orig->curlft.add_time; 1415 x->km.state = orig->km.state; 1416 x->km.seq = orig->km.seq; 1417 x->replay = orig->replay; 1418 x->preplay = orig->preplay; 1419 1420 return x; 1421 1422 error: 1423 xfrm_state_put(x); 1424 out: 1425 return NULL; 1426 } 1427 1428 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1429 { 1430 unsigned int h; 1431 struct xfrm_state *x = NULL; 1432 1433 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1434 1435 if (m->reqid) { 1436 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1437 m->reqid, m->old_family); 1438 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1439 if (x->props.mode != m->mode || 1440 x->id.proto != m->proto) 1441 continue; 1442 if (m->reqid && x->props.reqid != m->reqid) 1443 continue; 1444 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1445 m->old_family) || 1446 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1447 m->old_family)) 1448 continue; 1449 xfrm_state_hold(x); 1450 break; 1451 } 1452 } else { 1453 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1454 m->old_family); 1455 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1456 if (x->props.mode != m->mode || 1457 x->id.proto != m->proto) 1458 continue; 1459 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1460 m->old_family) || 1461 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1462 m->old_family)) 1463 continue; 1464 xfrm_state_hold(x); 1465 break; 1466 } 1467 } 1468 1469 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1470 1471 return x; 1472 } 1473 EXPORT_SYMBOL(xfrm_migrate_state_find); 1474 1475 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1476 struct xfrm_migrate *m, 1477 struct xfrm_encap_tmpl *encap) 1478 { 1479 struct xfrm_state *xc; 1480 1481 xc = xfrm_state_clone(x, encap); 1482 if (!xc) 1483 return NULL; 1484 1485 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1486 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1487 1488 /* add state */ 1489 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1490 /* a care is needed when the destination address of the 1491 state is to be updated as it is a part of triplet */ 1492 xfrm_state_insert(xc); 1493 } else { 1494 if (xfrm_state_add(xc) < 0) 1495 goto error; 1496 } 1497 1498 return xc; 1499 error: 1500 xfrm_state_put(xc); 1501 return NULL; 1502 } 1503 EXPORT_SYMBOL(xfrm_state_migrate); 1504 #endif 1505 1506 int xfrm_state_update(struct xfrm_state *x) 1507 { 1508 struct xfrm_state *x1, *to_put; 1509 int err; 1510 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1511 struct net *net = xs_net(x); 1512 1513 to_put = NULL; 1514 1515 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1516 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1517 1518 err = -ESRCH; 1519 if (!x1) 1520 goto out; 1521 1522 if (xfrm_state_kern(x1)) { 1523 to_put = x1; 1524 err = -EEXIST; 1525 goto out; 1526 } 1527 1528 if (x1->km.state == XFRM_STATE_ACQ) { 1529 __xfrm_state_insert(x); 1530 x = NULL; 1531 } 1532 err = 0; 1533 1534 out: 1535 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1536 1537 if (to_put) 1538 xfrm_state_put(to_put); 1539 1540 if (err) 1541 return err; 1542 1543 if (!x) { 1544 xfrm_state_delete(x1); 1545 xfrm_state_put(x1); 1546 return 0; 1547 } 1548 1549 err = -EINVAL; 1550 spin_lock_bh(&x1->lock); 1551 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1552 if (x->encap && x1->encap && 1553 x->encap->encap_type == x1->encap->encap_type) 1554 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1555 else if (x->encap || x1->encap) 1556 goto fail; 1557 1558 if (x->coaddr && x1->coaddr) { 1559 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1560 } 1561 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1562 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1563 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1564 x1->km.dying = 0; 1565 1566 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1567 if (x1->curlft.use_time) 1568 xfrm_state_check_expire(x1); 1569 1570 if (x->props.smark.m || x->props.smark.v || x->if_id) { 1571 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1572 1573 if (x->props.smark.m || x->props.smark.v) 1574 x1->props.smark = x->props.smark; 1575 1576 if (x->if_id) 1577 x1->if_id = x->if_id; 1578 1579 __xfrm_state_bump_genids(x1); 1580 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1581 } 1582 1583 err = 0; 1584 x->km.state = XFRM_STATE_DEAD; 1585 __xfrm_state_put(x); 1586 } 1587 1588 fail: 1589 spin_unlock_bh(&x1->lock); 1590 1591 xfrm_state_put(x1); 1592 1593 return err; 1594 } 1595 EXPORT_SYMBOL(xfrm_state_update); 1596 1597 int xfrm_state_check_expire(struct xfrm_state *x) 1598 { 1599 if (!x->curlft.use_time) 1600 x->curlft.use_time = ktime_get_real_seconds(); 1601 1602 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1603 x->curlft.packets >= x->lft.hard_packet_limit) { 1604 x->km.state = XFRM_STATE_EXPIRED; 1605 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL); 1606 return -EINVAL; 1607 } 1608 1609 if (!x->km.dying && 1610 (x->curlft.bytes >= x->lft.soft_byte_limit || 1611 x->curlft.packets >= x->lft.soft_packet_limit)) { 1612 x->km.dying = 1; 1613 km_state_expired(x, 0, 0); 1614 } 1615 return 0; 1616 } 1617 EXPORT_SYMBOL(xfrm_state_check_expire); 1618 1619 struct xfrm_state * 1620 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1621 u8 proto, unsigned short family) 1622 { 1623 struct xfrm_state *x; 1624 1625 rcu_read_lock(); 1626 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1627 rcu_read_unlock(); 1628 return x; 1629 } 1630 EXPORT_SYMBOL(xfrm_state_lookup); 1631 1632 struct xfrm_state * 1633 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1634 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1635 u8 proto, unsigned short family) 1636 { 1637 struct xfrm_state *x; 1638 1639 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1640 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1641 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1642 return x; 1643 } 1644 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1645 1646 struct xfrm_state * 1647 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1648 u32 if_id, u8 proto, const xfrm_address_t *daddr, 1649 const xfrm_address_t *saddr, int create, unsigned short family) 1650 { 1651 struct xfrm_state *x; 1652 1653 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1654 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create); 1655 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1656 1657 return x; 1658 } 1659 EXPORT_SYMBOL(xfrm_find_acq); 1660 1661 #ifdef CONFIG_XFRM_SUB_POLICY 1662 int 1663 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1664 unsigned short family, struct net *net) 1665 { 1666 int i; 1667 int err = 0; 1668 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1669 if (!afinfo) 1670 return -EAFNOSUPPORT; 1671 1672 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ 1673 if (afinfo->tmpl_sort) 1674 err = afinfo->tmpl_sort(dst, src, n); 1675 else 1676 for (i = 0; i < n; i++) 1677 dst[i] = src[i]; 1678 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1679 rcu_read_unlock(); 1680 return err; 1681 } 1682 EXPORT_SYMBOL(xfrm_tmpl_sort); 1683 1684 int 1685 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1686 unsigned short family) 1687 { 1688 int i; 1689 int err = 0; 1690 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1691 struct net *net = xs_net(*src); 1692 1693 if (!afinfo) 1694 return -EAFNOSUPPORT; 1695 1696 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1697 if (afinfo->state_sort) 1698 err = afinfo->state_sort(dst, src, n); 1699 else 1700 for (i = 0; i < n; i++) 1701 dst[i] = src[i]; 1702 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1703 rcu_read_unlock(); 1704 return err; 1705 } 1706 EXPORT_SYMBOL(xfrm_state_sort); 1707 #endif 1708 1709 /* Silly enough, but I'm lazy to build resolution list */ 1710 1711 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1712 { 1713 int i; 1714 1715 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1716 struct xfrm_state *x; 1717 1718 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1719 if (x->km.seq == seq && 1720 (mark & x->mark.m) == x->mark.v && 1721 x->km.state == XFRM_STATE_ACQ) { 1722 xfrm_state_hold(x); 1723 return x; 1724 } 1725 } 1726 } 1727 return NULL; 1728 } 1729 1730 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1731 { 1732 struct xfrm_state *x; 1733 1734 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1735 x = __xfrm_find_acq_byseq(net, mark, seq); 1736 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1737 return x; 1738 } 1739 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1740 1741 u32 xfrm_get_acqseq(void) 1742 { 1743 u32 res; 1744 static atomic_t acqseq; 1745 1746 do { 1747 res = atomic_inc_return(&acqseq); 1748 } while (!res); 1749 1750 return res; 1751 } 1752 EXPORT_SYMBOL(xfrm_get_acqseq); 1753 1754 int verify_spi_info(u8 proto, u32 min, u32 max) 1755 { 1756 switch (proto) { 1757 case IPPROTO_AH: 1758 case IPPROTO_ESP: 1759 break; 1760 1761 case IPPROTO_COMP: 1762 /* IPCOMP spi is 16-bits. */ 1763 if (max >= 0x10000) 1764 return -EINVAL; 1765 break; 1766 1767 default: 1768 return -EINVAL; 1769 } 1770 1771 if (min > max) 1772 return -EINVAL; 1773 1774 return 0; 1775 } 1776 EXPORT_SYMBOL(verify_spi_info); 1777 1778 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1779 { 1780 struct net *net = xs_net(x); 1781 unsigned int h; 1782 struct xfrm_state *x0; 1783 int err = -ENOENT; 1784 __be32 minspi = htonl(low); 1785 __be32 maxspi = htonl(high); 1786 u32 mark = x->mark.v & x->mark.m; 1787 1788 spin_lock_bh(&x->lock); 1789 if (x->km.state == XFRM_STATE_DEAD) 1790 goto unlock; 1791 1792 err = 0; 1793 if (x->id.spi) 1794 goto unlock; 1795 1796 err = -ENOENT; 1797 1798 if (minspi == maxspi) { 1799 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1800 if (x0) { 1801 xfrm_state_put(x0); 1802 goto unlock; 1803 } 1804 x->id.spi = minspi; 1805 } else { 1806 u32 spi = 0; 1807 for (h = 0; h < high-low+1; h++) { 1808 spi = low + prandom_u32()%(high-low+1); 1809 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1810 if (x0 == NULL) { 1811 x->id.spi = htonl(spi); 1812 break; 1813 } 1814 xfrm_state_put(x0); 1815 } 1816 } 1817 if (x->id.spi) { 1818 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1819 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1820 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1821 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1822 1823 err = 0; 1824 } 1825 1826 unlock: 1827 spin_unlock_bh(&x->lock); 1828 1829 return err; 1830 } 1831 EXPORT_SYMBOL(xfrm_alloc_spi); 1832 1833 static bool __xfrm_state_filter_match(struct xfrm_state *x, 1834 struct xfrm_address_filter *filter) 1835 { 1836 if (filter) { 1837 if ((filter->family == AF_INET || 1838 filter->family == AF_INET6) && 1839 x->props.family != filter->family) 1840 return false; 1841 1842 return addr_match(&x->props.saddr, &filter->saddr, 1843 filter->splen) && 1844 addr_match(&x->id.daddr, &filter->daddr, 1845 filter->dplen); 1846 } 1847 return true; 1848 } 1849 1850 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1851 int (*func)(struct xfrm_state *, int, void*), 1852 void *data) 1853 { 1854 struct xfrm_state *state; 1855 struct xfrm_state_walk *x; 1856 int err = 0; 1857 1858 if (walk->seq != 0 && list_empty(&walk->all)) 1859 return 0; 1860 1861 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1862 if (list_empty(&walk->all)) 1863 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1864 else 1865 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 1866 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1867 if (x->state == XFRM_STATE_DEAD) 1868 continue; 1869 state = container_of(x, struct xfrm_state, km); 1870 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1871 continue; 1872 if (!__xfrm_state_filter_match(state, walk->filter)) 1873 continue; 1874 err = func(state, walk->seq, data); 1875 if (err) { 1876 list_move_tail(&walk->all, &x->all); 1877 goto out; 1878 } 1879 walk->seq++; 1880 } 1881 if (walk->seq == 0) { 1882 err = -ENOENT; 1883 goto out; 1884 } 1885 list_del_init(&walk->all); 1886 out: 1887 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1888 return err; 1889 } 1890 EXPORT_SYMBOL(xfrm_state_walk); 1891 1892 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1893 struct xfrm_address_filter *filter) 1894 { 1895 INIT_LIST_HEAD(&walk->all); 1896 walk->proto = proto; 1897 walk->state = XFRM_STATE_DEAD; 1898 walk->seq = 0; 1899 walk->filter = filter; 1900 } 1901 EXPORT_SYMBOL(xfrm_state_walk_init); 1902 1903 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 1904 { 1905 kfree(walk->filter); 1906 1907 if (list_empty(&walk->all)) 1908 return; 1909 1910 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1911 list_del(&walk->all); 1912 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1913 } 1914 EXPORT_SYMBOL(xfrm_state_walk_done); 1915 1916 static void xfrm_replay_timer_handler(struct timer_list *t) 1917 { 1918 struct xfrm_state *x = from_timer(x, t, rtimer); 1919 1920 spin_lock(&x->lock); 1921 1922 if (x->km.state == XFRM_STATE_VALID) { 1923 if (xfrm_aevent_is_on(xs_net(x))) 1924 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1925 else 1926 x->xflags |= XFRM_TIME_DEFER; 1927 } 1928 1929 spin_unlock(&x->lock); 1930 } 1931 1932 static LIST_HEAD(xfrm_km_list); 1933 1934 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1935 { 1936 struct xfrm_mgr *km; 1937 1938 rcu_read_lock(); 1939 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1940 if (km->notify_policy) 1941 km->notify_policy(xp, dir, c); 1942 rcu_read_unlock(); 1943 } 1944 1945 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1946 { 1947 struct xfrm_mgr *km; 1948 rcu_read_lock(); 1949 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1950 if (km->notify) 1951 km->notify(x, c); 1952 rcu_read_unlock(); 1953 } 1954 1955 EXPORT_SYMBOL(km_policy_notify); 1956 EXPORT_SYMBOL(km_state_notify); 1957 1958 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1959 { 1960 struct km_event c; 1961 1962 c.data.hard = hard; 1963 c.portid = portid; 1964 c.event = XFRM_MSG_EXPIRE; 1965 km_state_notify(x, &c); 1966 } 1967 1968 EXPORT_SYMBOL(km_state_expired); 1969 /* 1970 * We send to all registered managers regardless of failure 1971 * We are happy with one success 1972 */ 1973 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1974 { 1975 int err = -EINVAL, acqret; 1976 struct xfrm_mgr *km; 1977 1978 rcu_read_lock(); 1979 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1980 acqret = km->acquire(x, t, pol); 1981 if (!acqret) 1982 err = acqret; 1983 } 1984 rcu_read_unlock(); 1985 return err; 1986 } 1987 EXPORT_SYMBOL(km_query); 1988 1989 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1990 { 1991 int err = -EINVAL; 1992 struct xfrm_mgr *km; 1993 1994 rcu_read_lock(); 1995 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1996 if (km->new_mapping) 1997 err = km->new_mapping(x, ipaddr, sport); 1998 if (!err) 1999 break; 2000 } 2001 rcu_read_unlock(); 2002 return err; 2003 } 2004 EXPORT_SYMBOL(km_new_mapping); 2005 2006 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2007 { 2008 struct km_event c; 2009 2010 c.data.hard = hard; 2011 c.portid = portid; 2012 c.event = XFRM_MSG_POLEXPIRE; 2013 km_policy_notify(pol, dir, &c); 2014 } 2015 EXPORT_SYMBOL(km_policy_expired); 2016 2017 #ifdef CONFIG_XFRM_MIGRATE 2018 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2019 const struct xfrm_migrate *m, int num_migrate, 2020 const struct xfrm_kmaddress *k, 2021 const struct xfrm_encap_tmpl *encap) 2022 { 2023 int err = -EINVAL; 2024 int ret; 2025 struct xfrm_mgr *km; 2026 2027 rcu_read_lock(); 2028 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2029 if (km->migrate) { 2030 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2031 encap); 2032 if (!ret) 2033 err = ret; 2034 } 2035 } 2036 rcu_read_unlock(); 2037 return err; 2038 } 2039 EXPORT_SYMBOL(km_migrate); 2040 #endif 2041 2042 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2043 { 2044 int err = -EINVAL; 2045 int ret; 2046 struct xfrm_mgr *km; 2047 2048 rcu_read_lock(); 2049 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2050 if (km->report) { 2051 ret = km->report(net, proto, sel, addr); 2052 if (!ret) 2053 err = ret; 2054 } 2055 } 2056 rcu_read_unlock(); 2057 return err; 2058 } 2059 EXPORT_SYMBOL(km_report); 2060 2061 bool km_is_alive(const struct km_event *c) 2062 { 2063 struct xfrm_mgr *km; 2064 bool is_alive = false; 2065 2066 rcu_read_lock(); 2067 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2068 if (km->is_alive && km->is_alive(c)) { 2069 is_alive = true; 2070 break; 2071 } 2072 } 2073 rcu_read_unlock(); 2074 2075 return is_alive; 2076 } 2077 EXPORT_SYMBOL(km_is_alive); 2078 2079 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 2080 { 2081 int err; 2082 u8 *data; 2083 struct xfrm_mgr *km; 2084 struct xfrm_policy *pol = NULL; 2085 2086 if (in_compat_syscall()) 2087 return -EOPNOTSUPP; 2088 2089 if (!optval && !optlen) { 2090 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2091 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2092 __sk_dst_reset(sk); 2093 return 0; 2094 } 2095 2096 if (optlen <= 0 || optlen > PAGE_SIZE) 2097 return -EMSGSIZE; 2098 2099 data = memdup_user(optval, optlen); 2100 if (IS_ERR(data)) 2101 return PTR_ERR(data); 2102 2103 err = -EINVAL; 2104 rcu_read_lock(); 2105 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2106 pol = km->compile_policy(sk, optname, data, 2107 optlen, &err); 2108 if (err >= 0) 2109 break; 2110 } 2111 rcu_read_unlock(); 2112 2113 if (err >= 0) { 2114 xfrm_sk_policy_insert(sk, err, pol); 2115 xfrm_pol_put(pol); 2116 __sk_dst_reset(sk); 2117 err = 0; 2118 } 2119 2120 kfree(data); 2121 return err; 2122 } 2123 EXPORT_SYMBOL(xfrm_user_policy); 2124 2125 static DEFINE_SPINLOCK(xfrm_km_lock); 2126 2127 int xfrm_register_km(struct xfrm_mgr *km) 2128 { 2129 spin_lock_bh(&xfrm_km_lock); 2130 list_add_tail_rcu(&km->list, &xfrm_km_list); 2131 spin_unlock_bh(&xfrm_km_lock); 2132 return 0; 2133 } 2134 EXPORT_SYMBOL(xfrm_register_km); 2135 2136 int xfrm_unregister_km(struct xfrm_mgr *km) 2137 { 2138 spin_lock_bh(&xfrm_km_lock); 2139 list_del_rcu(&km->list); 2140 spin_unlock_bh(&xfrm_km_lock); 2141 synchronize_rcu(); 2142 return 0; 2143 } 2144 EXPORT_SYMBOL(xfrm_unregister_km); 2145 2146 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 2147 { 2148 int err = 0; 2149 2150 if (WARN_ON(afinfo->family >= NPROTO)) 2151 return -EAFNOSUPPORT; 2152 2153 spin_lock_bh(&xfrm_state_afinfo_lock); 2154 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 2155 err = -EEXIST; 2156 else 2157 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 2158 spin_unlock_bh(&xfrm_state_afinfo_lock); 2159 return err; 2160 } 2161 EXPORT_SYMBOL(xfrm_state_register_afinfo); 2162 2163 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 2164 { 2165 int err = 0, family = afinfo->family; 2166 2167 if (WARN_ON(family >= NPROTO)) 2168 return -EAFNOSUPPORT; 2169 2170 spin_lock_bh(&xfrm_state_afinfo_lock); 2171 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 2172 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 2173 err = -EINVAL; 2174 else 2175 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 2176 } 2177 spin_unlock_bh(&xfrm_state_afinfo_lock); 2178 synchronize_rcu(); 2179 return err; 2180 } 2181 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 2182 2183 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 2184 { 2185 if (unlikely(family >= NPROTO)) 2186 return NULL; 2187 2188 return rcu_dereference(xfrm_state_afinfo[family]); 2189 } 2190 2191 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 2192 { 2193 struct xfrm_state_afinfo *afinfo; 2194 if (unlikely(family >= NPROTO)) 2195 return NULL; 2196 rcu_read_lock(); 2197 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 2198 if (unlikely(!afinfo)) 2199 rcu_read_unlock(); 2200 return afinfo; 2201 } 2202 2203 void xfrm_flush_gc(void) 2204 { 2205 flush_work(&xfrm_state_gc_work); 2206 } 2207 EXPORT_SYMBOL(xfrm_flush_gc); 2208 2209 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 2210 void xfrm_state_delete_tunnel(struct xfrm_state *x) 2211 { 2212 if (x->tunnel) { 2213 struct xfrm_state *t = x->tunnel; 2214 2215 if (atomic_read(&t->tunnel_users) == 2) 2216 xfrm_state_delete(t); 2217 atomic_dec(&t->tunnel_users); 2218 xfrm_state_put(t); 2219 x->tunnel = NULL; 2220 } 2221 } 2222 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 2223 2224 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 2225 { 2226 const struct xfrm_type *type = READ_ONCE(x->type); 2227 2228 if (x->km.state == XFRM_STATE_VALID && 2229 type && type->get_mtu) 2230 return type->get_mtu(x, mtu); 2231 2232 return mtu - x->props.header_len; 2233 } 2234 2235 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) 2236 { 2237 struct xfrm_state_afinfo *afinfo; 2238 struct xfrm_mode *inner_mode; 2239 int family = x->props.family; 2240 int err; 2241 2242 err = -EAFNOSUPPORT; 2243 afinfo = xfrm_state_get_afinfo(family); 2244 if (!afinfo) 2245 goto error; 2246 2247 err = 0; 2248 if (afinfo->init_flags) 2249 err = afinfo->init_flags(x); 2250 2251 rcu_read_unlock(); 2252 2253 if (err) 2254 goto error; 2255 2256 err = -EPROTONOSUPPORT; 2257 2258 if (x->sel.family != AF_UNSPEC) { 2259 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 2260 if (inner_mode == NULL) 2261 goto error; 2262 2263 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 2264 family != x->sel.family) { 2265 xfrm_put_mode(inner_mode); 2266 goto error; 2267 } 2268 2269 x->inner_mode = inner_mode; 2270 } else { 2271 struct xfrm_mode *inner_mode_iaf; 2272 int iafamily = AF_INET; 2273 2274 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 2275 if (inner_mode == NULL) 2276 goto error; 2277 2278 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 2279 xfrm_put_mode(inner_mode); 2280 goto error; 2281 } 2282 x->inner_mode = inner_mode; 2283 2284 if (x->props.family == AF_INET) 2285 iafamily = AF_INET6; 2286 2287 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2288 if (inner_mode_iaf) { 2289 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2290 x->inner_mode_iaf = inner_mode_iaf; 2291 else 2292 xfrm_put_mode(inner_mode_iaf); 2293 } 2294 } 2295 2296 x->type = xfrm_get_type(x->id.proto, family); 2297 if (x->type == NULL) 2298 goto error; 2299 2300 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); 2301 2302 err = x->type->init_state(x); 2303 if (err) 2304 goto error; 2305 2306 x->outer_mode = xfrm_get_mode(x->props.mode, family); 2307 if (x->outer_mode == NULL) { 2308 err = -EPROTONOSUPPORT; 2309 goto error; 2310 } 2311 2312 if (init_replay) { 2313 err = xfrm_init_replay(x); 2314 if (err) 2315 goto error; 2316 } 2317 2318 error: 2319 return err; 2320 } 2321 2322 EXPORT_SYMBOL(__xfrm_init_state); 2323 2324 int xfrm_init_state(struct xfrm_state *x) 2325 { 2326 int err; 2327 2328 err = __xfrm_init_state(x, true, false); 2329 if (!err) 2330 x->km.state = XFRM_STATE_VALID; 2331 2332 return err; 2333 } 2334 2335 EXPORT_SYMBOL(xfrm_init_state); 2336 2337 int __net_init xfrm_state_init(struct net *net) 2338 { 2339 unsigned int sz; 2340 2341 if (net_eq(net, &init_net)) 2342 xfrm_state_cache = KMEM_CACHE(xfrm_state, 2343 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 2344 2345 INIT_LIST_HEAD(&net->xfrm.state_all); 2346 2347 sz = sizeof(struct hlist_head) * 8; 2348 2349 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2350 if (!net->xfrm.state_bydst) 2351 goto out_bydst; 2352 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2353 if (!net->xfrm.state_bysrc) 2354 goto out_bysrc; 2355 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2356 if (!net->xfrm.state_byspi) 2357 goto out_byspi; 2358 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2359 2360 net->xfrm.state_num = 0; 2361 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2362 spin_lock_init(&net->xfrm.xfrm_state_lock); 2363 return 0; 2364 2365 out_byspi: 2366 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2367 out_bysrc: 2368 xfrm_hash_free(net->xfrm.state_bydst, sz); 2369 out_bydst: 2370 return -ENOMEM; 2371 } 2372 2373 void xfrm_state_fini(struct net *net) 2374 { 2375 unsigned int sz; 2376 2377 flush_work(&net->xfrm.state_hash_work); 2378 xfrm_state_flush(net, IPSEC_PROTO_ANY, false); 2379 flush_work(&xfrm_state_gc_work); 2380 2381 WARN_ON(!list_empty(&net->xfrm.state_all)); 2382 2383 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2384 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2385 xfrm_hash_free(net->xfrm.state_byspi, sz); 2386 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2387 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2388 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2389 xfrm_hash_free(net->xfrm.state_bydst, sz); 2390 } 2391 2392 #ifdef CONFIG_AUDITSYSCALL 2393 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2394 struct audit_buffer *audit_buf) 2395 { 2396 struct xfrm_sec_ctx *ctx = x->security; 2397 u32 spi = ntohl(x->id.spi); 2398 2399 if (ctx) 2400 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2401 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2402 2403 switch (x->props.family) { 2404 case AF_INET: 2405 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2406 &x->props.saddr.a4, &x->id.daddr.a4); 2407 break; 2408 case AF_INET6: 2409 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2410 x->props.saddr.a6, x->id.daddr.a6); 2411 break; 2412 } 2413 2414 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2415 } 2416 2417 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2418 struct audit_buffer *audit_buf) 2419 { 2420 const struct iphdr *iph4; 2421 const struct ipv6hdr *iph6; 2422 2423 switch (family) { 2424 case AF_INET: 2425 iph4 = ip_hdr(skb); 2426 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2427 &iph4->saddr, &iph4->daddr); 2428 break; 2429 case AF_INET6: 2430 iph6 = ipv6_hdr(skb); 2431 audit_log_format(audit_buf, 2432 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2433 &iph6->saddr, &iph6->daddr, 2434 iph6->flow_lbl[0] & 0x0f, 2435 iph6->flow_lbl[1], 2436 iph6->flow_lbl[2]); 2437 break; 2438 } 2439 } 2440 2441 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 2442 { 2443 struct audit_buffer *audit_buf; 2444 2445 audit_buf = xfrm_audit_start("SAD-add"); 2446 if (audit_buf == NULL) 2447 return; 2448 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2449 xfrm_audit_helper_sainfo(x, audit_buf); 2450 audit_log_format(audit_buf, " res=%u", result); 2451 audit_log_end(audit_buf); 2452 } 2453 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2454 2455 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 2456 { 2457 struct audit_buffer *audit_buf; 2458 2459 audit_buf = xfrm_audit_start("SAD-delete"); 2460 if (audit_buf == NULL) 2461 return; 2462 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2463 xfrm_audit_helper_sainfo(x, audit_buf); 2464 audit_log_format(audit_buf, " res=%u", result); 2465 audit_log_end(audit_buf); 2466 } 2467 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2468 2469 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2470 struct sk_buff *skb) 2471 { 2472 struct audit_buffer *audit_buf; 2473 u32 spi; 2474 2475 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2476 if (audit_buf == NULL) 2477 return; 2478 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2479 /* don't record the sequence number because it's inherent in this kind 2480 * of audit message */ 2481 spi = ntohl(x->id.spi); 2482 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2483 audit_log_end(audit_buf); 2484 } 2485 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2486 2487 void xfrm_audit_state_replay(struct xfrm_state *x, 2488 struct sk_buff *skb, __be32 net_seq) 2489 { 2490 struct audit_buffer *audit_buf; 2491 u32 spi; 2492 2493 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2494 if (audit_buf == NULL) 2495 return; 2496 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2497 spi = ntohl(x->id.spi); 2498 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2499 spi, spi, ntohl(net_seq)); 2500 audit_log_end(audit_buf); 2501 } 2502 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2503 2504 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2505 { 2506 struct audit_buffer *audit_buf; 2507 2508 audit_buf = xfrm_audit_start("SA-notfound"); 2509 if (audit_buf == NULL) 2510 return; 2511 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2512 audit_log_end(audit_buf); 2513 } 2514 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2515 2516 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2517 __be32 net_spi, __be32 net_seq) 2518 { 2519 struct audit_buffer *audit_buf; 2520 u32 spi; 2521 2522 audit_buf = xfrm_audit_start("SA-notfound"); 2523 if (audit_buf == NULL) 2524 return; 2525 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2526 spi = ntohl(net_spi); 2527 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2528 spi, spi, ntohl(net_seq)); 2529 audit_log_end(audit_buf); 2530 } 2531 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2532 2533 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2534 struct sk_buff *skb, u8 proto) 2535 { 2536 struct audit_buffer *audit_buf; 2537 __be32 net_spi; 2538 __be32 net_seq; 2539 2540 audit_buf = xfrm_audit_start("SA-icv-failure"); 2541 if (audit_buf == NULL) 2542 return; 2543 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2544 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2545 u32 spi = ntohl(net_spi); 2546 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2547 spi, spi, ntohl(net_seq)); 2548 } 2549 audit_log_end(audit_buf); 2550 } 2551 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2552 #endif /* CONFIG_AUDITSYSCALL */ 2553