1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * xfrm_state.c 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * YOSHIFUJI Hideaki @USAGI 11 * Split up af-specific functions 12 * Derek Atkins <derek@ihtfp.com> 13 * Add UDP Encapsulation 14 * 15 */ 16 17 #include <linux/workqueue.h> 18 #include <net/xfrm.h> 19 #include <linux/pfkeyv2.h> 20 #include <linux/ipsec.h> 21 #include <linux/module.h> 22 #include <linux/cache.h> 23 #include <linux/audit.h> 24 #include <linux/uaccess.h> 25 #include <linux/ktime.h> 26 #include <linux/slab.h> 27 #include <linux/interrupt.h> 28 #include <linux/kernel.h> 29 30 #include <crypto/aead.h> 31 32 #include "xfrm_hash.h" 33 34 #define xfrm_state_deref_prot(table, net) \ 35 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) 36 37 static void xfrm_state_gc_task(struct work_struct *work); 38 39 /* Each xfrm_state may be linked to two tables: 40 41 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) 42 2. Hash table by (daddr,family,reqid) to find what SAs exist for given 43 destination/tunnel endpoint. (output) 44 */ 45 46 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 47 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation); 48 static struct kmem_cache *xfrm_state_cache __ro_after_init; 49 50 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); 51 static HLIST_HEAD(xfrm_state_gc_list); 52 53 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) 54 { 55 return refcount_inc_not_zero(&x->refcnt); 56 } 57 58 static inline unsigned int xfrm_dst_hash(struct net *net, 59 const xfrm_address_t *daddr, 60 const xfrm_address_t *saddr, 61 u32 reqid, 62 unsigned short family) 63 { 64 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 65 } 66 67 static inline unsigned int xfrm_src_hash(struct net *net, 68 const xfrm_address_t *daddr, 69 const xfrm_address_t *saddr, 70 unsigned short family) 71 { 72 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 73 } 74 75 static inline unsigned int 76 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 77 __be32 spi, u8 proto, unsigned short family) 78 { 79 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 80 } 81 82 static void xfrm_hash_transfer(struct hlist_head *list, 83 struct hlist_head *ndsttable, 84 struct hlist_head *nsrctable, 85 struct hlist_head *nspitable, 86 unsigned int nhashmask) 87 { 88 struct hlist_node *tmp; 89 struct xfrm_state *x; 90 91 hlist_for_each_entry_safe(x, tmp, list, bydst) { 92 unsigned int h; 93 94 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 95 x->props.reqid, x->props.family, 96 nhashmask); 97 hlist_add_head_rcu(&x->bydst, ndsttable + h); 98 99 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 100 x->props.family, 101 nhashmask); 102 hlist_add_head_rcu(&x->bysrc, nsrctable + h); 103 104 if (x->id.spi) { 105 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 106 x->id.proto, x->props.family, 107 nhashmask); 108 hlist_add_head_rcu(&x->byspi, nspitable + h); 109 } 110 } 111 } 112 113 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 114 { 115 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 116 } 117 118 static void xfrm_hash_resize(struct work_struct *work) 119 { 120 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 121 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 122 unsigned long nsize, osize; 123 unsigned int nhashmask, ohashmask; 124 int i; 125 126 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 127 ndst = xfrm_hash_alloc(nsize); 128 if (!ndst) 129 return; 130 nsrc = xfrm_hash_alloc(nsize); 131 if (!nsrc) { 132 xfrm_hash_free(ndst, nsize); 133 return; 134 } 135 nspi = xfrm_hash_alloc(nsize); 136 if (!nspi) { 137 xfrm_hash_free(ndst, nsize); 138 xfrm_hash_free(nsrc, nsize); 139 return; 140 } 141 142 spin_lock_bh(&net->xfrm.xfrm_state_lock); 143 write_seqcount_begin(&xfrm_state_hash_generation); 144 145 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 146 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); 147 for (i = net->xfrm.state_hmask; i >= 0; i--) 148 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask); 149 150 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); 151 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); 152 ohashmask = net->xfrm.state_hmask; 153 154 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 155 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 156 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 157 net->xfrm.state_hmask = nhashmask; 158 159 write_seqcount_end(&xfrm_state_hash_generation); 160 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 161 162 osize = (ohashmask + 1) * sizeof(struct hlist_head); 163 164 synchronize_rcu(); 165 166 xfrm_hash_free(odst, osize); 167 xfrm_hash_free(osrc, osize); 168 xfrm_hash_free(ospi, osize); 169 } 170 171 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 172 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 173 174 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 175 176 int __xfrm_state_delete(struct xfrm_state *x); 177 178 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 179 static bool km_is_alive(const struct km_event *c); 180 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 181 182 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 183 { 184 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 185 int err = 0; 186 187 if (!afinfo) 188 return -EAFNOSUPPORT; 189 190 #define X(afi, T, name) do { \ 191 WARN_ON((afi)->type_ ## name); \ 192 (afi)->type_ ## name = (T); \ 193 } while (0) 194 195 switch (type->proto) { 196 case IPPROTO_COMP: 197 X(afinfo, type, comp); 198 break; 199 case IPPROTO_AH: 200 X(afinfo, type, ah); 201 break; 202 case IPPROTO_ESP: 203 X(afinfo, type, esp); 204 break; 205 case IPPROTO_IPIP: 206 X(afinfo, type, ipip); 207 break; 208 case IPPROTO_DSTOPTS: 209 X(afinfo, type, dstopts); 210 break; 211 case IPPROTO_ROUTING: 212 X(afinfo, type, routing); 213 break; 214 case IPPROTO_IPV6: 215 X(afinfo, type, ipip6); 216 break; 217 default: 218 WARN_ON(1); 219 err = -EPROTONOSUPPORT; 220 break; 221 } 222 #undef X 223 rcu_read_unlock(); 224 return err; 225 } 226 EXPORT_SYMBOL(xfrm_register_type); 227 228 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 229 { 230 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 231 232 if (unlikely(afinfo == NULL)) 233 return; 234 235 #define X(afi, T, name) do { \ 236 WARN_ON((afi)->type_ ## name != (T)); \ 237 (afi)->type_ ## name = NULL; \ 238 } while (0) 239 240 switch (type->proto) { 241 case IPPROTO_COMP: 242 X(afinfo, type, comp); 243 break; 244 case IPPROTO_AH: 245 X(afinfo, type, ah); 246 break; 247 case IPPROTO_ESP: 248 X(afinfo, type, esp); 249 break; 250 case IPPROTO_IPIP: 251 X(afinfo, type, ipip); 252 break; 253 case IPPROTO_DSTOPTS: 254 X(afinfo, type, dstopts); 255 break; 256 case IPPROTO_ROUTING: 257 X(afinfo, type, routing); 258 break; 259 case IPPROTO_IPV6: 260 X(afinfo, type, ipip6); 261 break; 262 default: 263 WARN_ON(1); 264 break; 265 } 266 #undef X 267 rcu_read_unlock(); 268 } 269 EXPORT_SYMBOL(xfrm_unregister_type); 270 271 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 272 { 273 const struct xfrm_type *type = NULL; 274 struct xfrm_state_afinfo *afinfo; 275 int modload_attempted = 0; 276 277 retry: 278 afinfo = xfrm_state_get_afinfo(family); 279 if (unlikely(afinfo == NULL)) 280 return NULL; 281 282 switch (proto) { 283 case IPPROTO_COMP: 284 type = afinfo->type_comp; 285 break; 286 case IPPROTO_AH: 287 type = afinfo->type_ah; 288 break; 289 case IPPROTO_ESP: 290 type = afinfo->type_esp; 291 break; 292 case IPPROTO_IPIP: 293 type = afinfo->type_ipip; 294 break; 295 case IPPROTO_DSTOPTS: 296 type = afinfo->type_dstopts; 297 break; 298 case IPPROTO_ROUTING: 299 type = afinfo->type_routing; 300 break; 301 case IPPROTO_IPV6: 302 type = afinfo->type_ipip6; 303 break; 304 default: 305 break; 306 } 307 308 if (unlikely(type && !try_module_get(type->owner))) 309 type = NULL; 310 311 rcu_read_unlock(); 312 313 if (!type && !modload_attempted) { 314 request_module("xfrm-type-%d-%d", family, proto); 315 modload_attempted = 1; 316 goto retry; 317 } 318 319 return type; 320 } 321 322 static void xfrm_put_type(const struct xfrm_type *type) 323 { 324 module_put(type->owner); 325 } 326 327 int xfrm_register_type_offload(const struct xfrm_type_offload *type, 328 unsigned short family) 329 { 330 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 331 int err = 0; 332 333 if (unlikely(afinfo == NULL)) 334 return -EAFNOSUPPORT; 335 336 switch (type->proto) { 337 case IPPROTO_ESP: 338 WARN_ON(afinfo->type_offload_esp); 339 afinfo->type_offload_esp = type; 340 break; 341 default: 342 WARN_ON(1); 343 err = -EPROTONOSUPPORT; 344 break; 345 } 346 347 rcu_read_unlock(); 348 return err; 349 } 350 EXPORT_SYMBOL(xfrm_register_type_offload); 351 352 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, 353 unsigned short family) 354 { 355 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 356 357 if (unlikely(afinfo == NULL)) 358 return; 359 360 switch (type->proto) { 361 case IPPROTO_ESP: 362 WARN_ON(afinfo->type_offload_esp != type); 363 afinfo->type_offload_esp = NULL; 364 break; 365 default: 366 WARN_ON(1); 367 break; 368 } 369 rcu_read_unlock(); 370 } 371 EXPORT_SYMBOL(xfrm_unregister_type_offload); 372 373 static const struct xfrm_type_offload * 374 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load) 375 { 376 const struct xfrm_type_offload *type = NULL; 377 struct xfrm_state_afinfo *afinfo; 378 379 retry: 380 afinfo = xfrm_state_get_afinfo(family); 381 if (unlikely(afinfo == NULL)) 382 return NULL; 383 384 switch (proto) { 385 case IPPROTO_ESP: 386 type = afinfo->type_offload_esp; 387 break; 388 default: 389 break; 390 } 391 392 if ((type && !try_module_get(type->owner))) 393 type = NULL; 394 395 rcu_read_unlock(); 396 397 if (!type && try_load) { 398 request_module("xfrm-offload-%d-%d", family, proto); 399 try_load = false; 400 goto retry; 401 } 402 403 return type; 404 } 405 406 static void xfrm_put_type_offload(const struct xfrm_type_offload *type) 407 { 408 module_put(type->owner); 409 } 410 411 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = { 412 [XFRM_MODE_BEET] = { 413 .encap = XFRM_MODE_BEET, 414 .flags = XFRM_MODE_FLAG_TUNNEL, 415 .family = AF_INET, 416 }, 417 [XFRM_MODE_TRANSPORT] = { 418 .encap = XFRM_MODE_TRANSPORT, 419 .family = AF_INET, 420 }, 421 [XFRM_MODE_TUNNEL] = { 422 .encap = XFRM_MODE_TUNNEL, 423 .flags = XFRM_MODE_FLAG_TUNNEL, 424 .family = AF_INET, 425 }, 426 }; 427 428 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = { 429 [XFRM_MODE_BEET] = { 430 .encap = XFRM_MODE_BEET, 431 .flags = XFRM_MODE_FLAG_TUNNEL, 432 .family = AF_INET6, 433 }, 434 [XFRM_MODE_ROUTEOPTIMIZATION] = { 435 .encap = XFRM_MODE_ROUTEOPTIMIZATION, 436 .family = AF_INET6, 437 }, 438 [XFRM_MODE_TRANSPORT] = { 439 .encap = XFRM_MODE_TRANSPORT, 440 .family = AF_INET6, 441 }, 442 [XFRM_MODE_TUNNEL] = { 443 .encap = XFRM_MODE_TUNNEL, 444 .flags = XFRM_MODE_FLAG_TUNNEL, 445 .family = AF_INET6, 446 }, 447 }; 448 449 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 450 { 451 const struct xfrm_mode *mode; 452 453 if (unlikely(encap >= XFRM_MODE_MAX)) 454 return NULL; 455 456 switch (family) { 457 case AF_INET: 458 mode = &xfrm4_mode_map[encap]; 459 if (mode->family == family) 460 return mode; 461 break; 462 case AF_INET6: 463 mode = &xfrm6_mode_map[encap]; 464 if (mode->family == family) 465 return mode; 466 break; 467 default: 468 break; 469 } 470 471 return NULL; 472 } 473 474 void xfrm_state_free(struct xfrm_state *x) 475 { 476 kmem_cache_free(xfrm_state_cache, x); 477 } 478 EXPORT_SYMBOL(xfrm_state_free); 479 480 static void ___xfrm_state_destroy(struct xfrm_state *x) 481 { 482 hrtimer_cancel(&x->mtimer); 483 del_timer_sync(&x->rtimer); 484 kfree(x->aead); 485 kfree(x->aalg); 486 kfree(x->ealg); 487 kfree(x->calg); 488 kfree(x->encap); 489 kfree(x->coaddr); 490 kfree(x->replay_esn); 491 kfree(x->preplay_esn); 492 if (x->type_offload) 493 xfrm_put_type_offload(x->type_offload); 494 if (x->type) { 495 x->type->destructor(x); 496 xfrm_put_type(x->type); 497 } 498 if (x->xfrag.page) 499 put_page(x->xfrag.page); 500 xfrm_dev_state_free(x); 501 security_xfrm_state_free(x); 502 xfrm_state_free(x); 503 } 504 505 static void xfrm_state_gc_task(struct work_struct *work) 506 { 507 struct xfrm_state *x; 508 struct hlist_node *tmp; 509 struct hlist_head gc_list; 510 511 spin_lock_bh(&xfrm_state_gc_lock); 512 hlist_move_list(&xfrm_state_gc_list, &gc_list); 513 spin_unlock_bh(&xfrm_state_gc_lock); 514 515 synchronize_rcu(); 516 517 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 518 ___xfrm_state_destroy(x); 519 } 520 521 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 522 { 523 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer); 524 enum hrtimer_restart ret = HRTIMER_NORESTART; 525 time64_t now = ktime_get_real_seconds(); 526 time64_t next = TIME64_MAX; 527 int warn = 0; 528 int err = 0; 529 530 spin_lock(&x->lock); 531 if (x->km.state == XFRM_STATE_DEAD) 532 goto out; 533 if (x->km.state == XFRM_STATE_EXPIRED) 534 goto expired; 535 if (x->lft.hard_add_expires_seconds) { 536 long tmo = x->lft.hard_add_expires_seconds + 537 x->curlft.add_time - now; 538 if (tmo <= 0) { 539 if (x->xflags & XFRM_SOFT_EXPIRE) { 540 /* enter hard expire without soft expire first?! 541 * setting a new date could trigger this. 542 * workaround: fix x->curflt.add_time by below: 543 */ 544 x->curlft.add_time = now - x->saved_tmo - 1; 545 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 546 } else 547 goto expired; 548 } 549 if (tmo < next) 550 next = tmo; 551 } 552 if (x->lft.hard_use_expires_seconds) { 553 long tmo = x->lft.hard_use_expires_seconds + 554 (x->curlft.use_time ? : now) - now; 555 if (tmo <= 0) 556 goto expired; 557 if (tmo < next) 558 next = tmo; 559 } 560 if (x->km.dying) 561 goto resched; 562 if (x->lft.soft_add_expires_seconds) { 563 long tmo = x->lft.soft_add_expires_seconds + 564 x->curlft.add_time - now; 565 if (tmo <= 0) { 566 warn = 1; 567 x->xflags &= ~XFRM_SOFT_EXPIRE; 568 } else if (tmo < next) { 569 next = tmo; 570 x->xflags |= XFRM_SOFT_EXPIRE; 571 x->saved_tmo = tmo; 572 } 573 } 574 if (x->lft.soft_use_expires_seconds) { 575 long tmo = x->lft.soft_use_expires_seconds + 576 (x->curlft.use_time ? : now) - now; 577 if (tmo <= 0) 578 warn = 1; 579 else if (tmo < next) 580 next = tmo; 581 } 582 583 x->km.dying = warn; 584 if (warn) 585 km_state_expired(x, 0, 0); 586 resched: 587 if (next != TIME64_MAX) { 588 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0)); 589 ret = HRTIMER_RESTART; 590 } 591 592 goto out; 593 594 expired: 595 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 596 x->km.state = XFRM_STATE_EXPIRED; 597 598 err = __xfrm_state_delete(x); 599 if (!err) 600 km_state_expired(x, 1, 0); 601 602 xfrm_audit_state_delete(x, err ? 0 : 1, true); 603 604 out: 605 spin_unlock(&x->lock); 606 return ret; 607 } 608 609 static void xfrm_replay_timer_handler(struct timer_list *t); 610 611 struct xfrm_state *xfrm_state_alloc(struct net *net) 612 { 613 struct xfrm_state *x; 614 615 x = kmem_cache_alloc(xfrm_state_cache, GFP_ATOMIC | __GFP_ZERO); 616 617 if (x) { 618 write_pnet(&x->xs_net, net); 619 refcount_set(&x->refcnt, 1); 620 atomic_set(&x->tunnel_users, 0); 621 INIT_LIST_HEAD(&x->km.all); 622 INIT_HLIST_NODE(&x->bydst); 623 INIT_HLIST_NODE(&x->bysrc); 624 INIT_HLIST_NODE(&x->byspi); 625 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT); 626 x->mtimer.function = xfrm_timer_handler; 627 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 628 x->curlft.add_time = ktime_get_real_seconds(); 629 x->lft.soft_byte_limit = XFRM_INF; 630 x->lft.soft_packet_limit = XFRM_INF; 631 x->lft.hard_byte_limit = XFRM_INF; 632 x->lft.hard_packet_limit = XFRM_INF; 633 x->replay_maxage = 0; 634 x->replay_maxdiff = 0; 635 spin_lock_init(&x->lock); 636 } 637 return x; 638 } 639 EXPORT_SYMBOL(xfrm_state_alloc); 640 641 void __xfrm_state_destroy(struct xfrm_state *x, bool sync) 642 { 643 WARN_ON(x->km.state != XFRM_STATE_DEAD); 644 645 if (sync) { 646 synchronize_rcu(); 647 ___xfrm_state_destroy(x); 648 } else { 649 spin_lock_bh(&xfrm_state_gc_lock); 650 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 651 spin_unlock_bh(&xfrm_state_gc_lock); 652 schedule_work(&xfrm_state_gc_work); 653 } 654 } 655 EXPORT_SYMBOL(__xfrm_state_destroy); 656 657 int __xfrm_state_delete(struct xfrm_state *x) 658 { 659 struct net *net = xs_net(x); 660 int err = -ESRCH; 661 662 if (x->km.state != XFRM_STATE_DEAD) { 663 x->km.state = XFRM_STATE_DEAD; 664 spin_lock(&net->xfrm.xfrm_state_lock); 665 list_del(&x->km.all); 666 hlist_del_rcu(&x->bydst); 667 hlist_del_rcu(&x->bysrc); 668 if (x->id.spi) 669 hlist_del_rcu(&x->byspi); 670 net->xfrm.state_num--; 671 spin_unlock(&net->xfrm.xfrm_state_lock); 672 673 xfrm_dev_state_delete(x); 674 675 /* All xfrm_state objects are created by xfrm_state_alloc. 676 * The xfrm_state_alloc call gives a reference, and that 677 * is what we are dropping here. 678 */ 679 xfrm_state_put(x); 680 err = 0; 681 } 682 683 return err; 684 } 685 EXPORT_SYMBOL(__xfrm_state_delete); 686 687 int xfrm_state_delete(struct xfrm_state *x) 688 { 689 int err; 690 691 spin_lock_bh(&x->lock); 692 err = __xfrm_state_delete(x); 693 spin_unlock_bh(&x->lock); 694 695 return err; 696 } 697 EXPORT_SYMBOL(xfrm_state_delete); 698 699 #ifdef CONFIG_SECURITY_NETWORK_XFRM 700 static inline int 701 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 702 { 703 int i, err = 0; 704 705 for (i = 0; i <= net->xfrm.state_hmask; i++) { 706 struct xfrm_state *x; 707 708 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 709 if (xfrm_id_proto_match(x->id.proto, proto) && 710 (err = security_xfrm_state_delete(x)) != 0) { 711 xfrm_audit_state_delete(x, 0, task_valid); 712 return err; 713 } 714 } 715 } 716 717 return err; 718 } 719 720 static inline int 721 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 722 { 723 int i, err = 0; 724 725 for (i = 0; i <= net->xfrm.state_hmask; i++) { 726 struct xfrm_state *x; 727 struct xfrm_state_offload *xso; 728 729 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 730 xso = &x->xso; 731 732 if (xso->dev == dev && 733 (err = security_xfrm_state_delete(x)) != 0) { 734 xfrm_audit_state_delete(x, 0, task_valid); 735 return err; 736 } 737 } 738 } 739 740 return err; 741 } 742 #else 743 static inline int 744 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 745 { 746 return 0; 747 } 748 749 static inline int 750 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 751 { 752 return 0; 753 } 754 #endif 755 756 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync) 757 { 758 int i, err = 0, cnt = 0; 759 760 spin_lock_bh(&net->xfrm.xfrm_state_lock); 761 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 762 if (err) 763 goto out; 764 765 err = -ESRCH; 766 for (i = 0; i <= net->xfrm.state_hmask; i++) { 767 struct xfrm_state *x; 768 restart: 769 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 770 if (!xfrm_state_kern(x) && 771 xfrm_id_proto_match(x->id.proto, proto)) { 772 xfrm_state_hold(x); 773 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 774 775 err = xfrm_state_delete(x); 776 xfrm_audit_state_delete(x, err ? 0 : 1, 777 task_valid); 778 if (sync) 779 xfrm_state_put_sync(x); 780 else 781 xfrm_state_put(x); 782 if (!err) 783 cnt++; 784 785 spin_lock_bh(&net->xfrm.xfrm_state_lock); 786 goto restart; 787 } 788 } 789 } 790 out: 791 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 792 if (cnt) 793 err = 0; 794 795 return err; 796 } 797 EXPORT_SYMBOL(xfrm_state_flush); 798 799 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 800 { 801 int i, err = 0, cnt = 0; 802 803 spin_lock_bh(&net->xfrm.xfrm_state_lock); 804 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 805 if (err) 806 goto out; 807 808 err = -ESRCH; 809 for (i = 0; i <= net->xfrm.state_hmask; i++) { 810 struct xfrm_state *x; 811 struct xfrm_state_offload *xso; 812 restart: 813 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 814 xso = &x->xso; 815 816 if (!xfrm_state_kern(x) && xso->dev == dev) { 817 xfrm_state_hold(x); 818 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 819 820 err = xfrm_state_delete(x); 821 xfrm_audit_state_delete(x, err ? 0 : 1, 822 task_valid); 823 xfrm_state_put(x); 824 if (!err) 825 cnt++; 826 827 spin_lock_bh(&net->xfrm.xfrm_state_lock); 828 goto restart; 829 } 830 } 831 } 832 if (cnt) 833 err = 0; 834 835 out: 836 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 837 return err; 838 } 839 EXPORT_SYMBOL(xfrm_dev_state_flush); 840 841 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 842 { 843 spin_lock_bh(&net->xfrm.xfrm_state_lock); 844 si->sadcnt = net->xfrm.state_num; 845 si->sadhcnt = net->xfrm.state_hmask + 1; 846 si->sadhmcnt = xfrm_state_hashmax; 847 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 848 } 849 EXPORT_SYMBOL(xfrm_sad_getinfo); 850 851 static void 852 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 853 { 854 const struct flowi4 *fl4 = &fl->u.ip4; 855 856 sel->daddr.a4 = fl4->daddr; 857 sel->saddr.a4 = fl4->saddr; 858 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 859 sel->dport_mask = htons(0xffff); 860 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 861 sel->sport_mask = htons(0xffff); 862 sel->family = AF_INET; 863 sel->prefixlen_d = 32; 864 sel->prefixlen_s = 32; 865 sel->proto = fl4->flowi4_proto; 866 sel->ifindex = fl4->flowi4_oif; 867 } 868 869 static void 870 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 871 { 872 const struct flowi6 *fl6 = &fl->u.ip6; 873 874 /* Initialize temporary selector matching only to current session. */ 875 *(struct in6_addr *)&sel->daddr = fl6->daddr; 876 *(struct in6_addr *)&sel->saddr = fl6->saddr; 877 sel->dport = xfrm_flowi_dport(fl, &fl6->uli); 878 sel->dport_mask = htons(0xffff); 879 sel->sport = xfrm_flowi_sport(fl, &fl6->uli); 880 sel->sport_mask = htons(0xffff); 881 sel->family = AF_INET6; 882 sel->prefixlen_d = 128; 883 sel->prefixlen_s = 128; 884 sel->proto = fl6->flowi6_proto; 885 sel->ifindex = fl6->flowi6_oif; 886 } 887 888 static void 889 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 890 const struct xfrm_tmpl *tmpl, 891 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 892 unsigned short family) 893 { 894 switch (family) { 895 case AF_INET: 896 __xfrm4_init_tempsel(&x->sel, fl); 897 break; 898 case AF_INET6: 899 __xfrm6_init_tempsel(&x->sel, fl); 900 break; 901 } 902 903 x->id = tmpl->id; 904 905 switch (tmpl->encap_family) { 906 case AF_INET: 907 if (x->id.daddr.a4 == 0) 908 x->id.daddr.a4 = daddr->a4; 909 x->props.saddr = tmpl->saddr; 910 if (x->props.saddr.a4 == 0) 911 x->props.saddr.a4 = saddr->a4; 912 break; 913 case AF_INET6: 914 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) 915 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 916 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 917 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) 918 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 919 break; 920 } 921 922 x->props.mode = tmpl->mode; 923 x->props.reqid = tmpl->reqid; 924 x->props.family = tmpl->encap_family; 925 } 926 927 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 928 const xfrm_address_t *daddr, 929 __be32 spi, u8 proto, 930 unsigned short family) 931 { 932 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 933 struct xfrm_state *x; 934 935 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { 936 if (x->props.family != family || 937 x->id.spi != spi || 938 x->id.proto != proto || 939 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 940 continue; 941 942 if ((mark & x->mark.m) != x->mark.v) 943 continue; 944 if (!xfrm_state_hold_rcu(x)) 945 continue; 946 return x; 947 } 948 949 return NULL; 950 } 951 952 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 953 const xfrm_address_t *daddr, 954 const xfrm_address_t *saddr, 955 u8 proto, unsigned short family) 956 { 957 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 958 struct xfrm_state *x; 959 960 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { 961 if (x->props.family != family || 962 x->id.proto != proto || 963 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 964 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 965 continue; 966 967 if ((mark & x->mark.m) != x->mark.v) 968 continue; 969 if (!xfrm_state_hold_rcu(x)) 970 continue; 971 return x; 972 } 973 974 return NULL; 975 } 976 977 static inline struct xfrm_state * 978 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 979 { 980 struct net *net = xs_net(x); 981 u32 mark = x->mark.v & x->mark.m; 982 983 if (use_spi) 984 return __xfrm_state_lookup(net, mark, &x->id.daddr, 985 x->id.spi, x->id.proto, family); 986 else 987 return __xfrm_state_lookup_byaddr(net, mark, 988 &x->id.daddr, 989 &x->props.saddr, 990 x->id.proto, family); 991 } 992 993 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 994 { 995 if (have_hash_collision && 996 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 997 net->xfrm.state_num > net->xfrm.state_hmask) 998 schedule_work(&net->xfrm.state_hash_work); 999 } 1000 1001 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 1002 const struct flowi *fl, unsigned short family, 1003 struct xfrm_state **best, int *acq_in_progress, 1004 int *error) 1005 { 1006 /* Resolution logic: 1007 * 1. There is a valid state with matching selector. Done. 1008 * 2. Valid state with inappropriate selector. Skip. 1009 * 1010 * Entering area of "sysdeps". 1011 * 1012 * 3. If state is not valid, selector is temporary, it selects 1013 * only session which triggered previous resolution. Key 1014 * manager will do something to install a state with proper 1015 * selector. 1016 */ 1017 if (x->km.state == XFRM_STATE_VALID) { 1018 if ((x->sel.family && 1019 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 1020 !security_xfrm_state_pol_flow_match(x, pol, fl)) 1021 return; 1022 1023 if (!*best || 1024 (*best)->km.dying > x->km.dying || 1025 ((*best)->km.dying == x->km.dying && 1026 (*best)->curlft.add_time < x->curlft.add_time)) 1027 *best = x; 1028 } else if (x->km.state == XFRM_STATE_ACQ) { 1029 *acq_in_progress = 1; 1030 } else if (x->km.state == XFRM_STATE_ERROR || 1031 x->km.state == XFRM_STATE_EXPIRED) { 1032 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 1033 security_xfrm_state_pol_flow_match(x, pol, fl)) 1034 *error = -ESRCH; 1035 } 1036 } 1037 1038 struct xfrm_state * 1039 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1040 const struct flowi *fl, struct xfrm_tmpl *tmpl, 1041 struct xfrm_policy *pol, int *err, 1042 unsigned short family, u32 if_id) 1043 { 1044 static xfrm_address_t saddr_wildcard = { }; 1045 struct net *net = xp_net(pol); 1046 unsigned int h, h_wildcard; 1047 struct xfrm_state *x, *x0, *to_put; 1048 int acquire_in_progress = 0; 1049 int error = 0; 1050 struct xfrm_state *best = NULL; 1051 u32 mark = pol->mark.v & pol->mark.m; 1052 unsigned short encap_family = tmpl->encap_family; 1053 unsigned int sequence; 1054 struct km_event c; 1055 1056 to_put = NULL; 1057 1058 sequence = read_seqcount_begin(&xfrm_state_hash_generation); 1059 1060 rcu_read_lock(); 1061 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 1062 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { 1063 if (x->props.family == encap_family && 1064 x->props.reqid == tmpl->reqid && 1065 (mark & x->mark.m) == x->mark.v && 1066 x->if_id == if_id && 1067 !(x->props.flags & XFRM_STATE_WILDRECV) && 1068 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1069 tmpl->mode == x->props.mode && 1070 tmpl->id.proto == x->id.proto && 1071 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1072 xfrm_state_look_at(pol, x, fl, encap_family, 1073 &best, &acquire_in_progress, &error); 1074 } 1075 if (best || acquire_in_progress) 1076 goto found; 1077 1078 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 1079 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { 1080 if (x->props.family == encap_family && 1081 x->props.reqid == tmpl->reqid && 1082 (mark & x->mark.m) == x->mark.v && 1083 x->if_id == if_id && 1084 !(x->props.flags & XFRM_STATE_WILDRECV) && 1085 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1086 tmpl->mode == x->props.mode && 1087 tmpl->id.proto == x->id.proto && 1088 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1089 xfrm_state_look_at(pol, x, fl, encap_family, 1090 &best, &acquire_in_progress, &error); 1091 } 1092 1093 found: 1094 x = best; 1095 if (!x && !error && !acquire_in_progress) { 1096 if (tmpl->id.spi && 1097 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 1098 tmpl->id.proto, encap_family)) != NULL) { 1099 to_put = x0; 1100 error = -EEXIST; 1101 goto out; 1102 } 1103 1104 c.net = net; 1105 /* If the KMs have no listeners (yet...), avoid allocating an SA 1106 * for each and every packet - garbage collection might not 1107 * handle the flood. 1108 */ 1109 if (!km_is_alive(&c)) { 1110 error = -ESRCH; 1111 goto out; 1112 } 1113 1114 x = xfrm_state_alloc(net); 1115 if (x == NULL) { 1116 error = -ENOMEM; 1117 goto out; 1118 } 1119 /* Initialize temporary state matching only 1120 * to current session. */ 1121 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1122 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1123 x->if_id = if_id; 1124 1125 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1126 if (error) { 1127 x->km.state = XFRM_STATE_DEAD; 1128 to_put = x; 1129 x = NULL; 1130 goto out; 1131 } 1132 1133 if (km_query(x, tmpl, pol) == 0) { 1134 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1135 x->km.state = XFRM_STATE_ACQ; 1136 list_add(&x->km.all, &net->xfrm.state_all); 1137 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1138 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1139 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1140 if (x->id.spi) { 1141 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1142 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1143 } 1144 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1145 hrtimer_start(&x->mtimer, 1146 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1147 HRTIMER_MODE_REL_SOFT); 1148 net->xfrm.state_num++; 1149 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1150 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1151 } else { 1152 x->km.state = XFRM_STATE_DEAD; 1153 to_put = x; 1154 x = NULL; 1155 error = -ESRCH; 1156 } 1157 } 1158 out: 1159 if (x) { 1160 if (!xfrm_state_hold_rcu(x)) { 1161 *err = -EAGAIN; 1162 x = NULL; 1163 } 1164 } else { 1165 *err = acquire_in_progress ? -EAGAIN : error; 1166 } 1167 rcu_read_unlock(); 1168 if (to_put) 1169 xfrm_state_put(to_put); 1170 1171 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { 1172 *err = -EAGAIN; 1173 if (x) { 1174 xfrm_state_put(x); 1175 x = NULL; 1176 } 1177 } 1178 1179 return x; 1180 } 1181 1182 struct xfrm_state * 1183 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1184 xfrm_address_t *daddr, xfrm_address_t *saddr, 1185 unsigned short family, u8 mode, u8 proto, u32 reqid) 1186 { 1187 unsigned int h; 1188 struct xfrm_state *rx = NULL, *x = NULL; 1189 1190 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1191 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1192 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1193 if (x->props.family == family && 1194 x->props.reqid == reqid && 1195 (mark & x->mark.m) == x->mark.v && 1196 x->if_id == if_id && 1197 !(x->props.flags & XFRM_STATE_WILDRECV) && 1198 xfrm_state_addr_check(x, daddr, saddr, family) && 1199 mode == x->props.mode && 1200 proto == x->id.proto && 1201 x->km.state == XFRM_STATE_VALID) { 1202 rx = x; 1203 break; 1204 } 1205 } 1206 1207 if (rx) 1208 xfrm_state_hold(rx); 1209 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1210 1211 1212 return rx; 1213 } 1214 EXPORT_SYMBOL(xfrm_stateonly_find); 1215 1216 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1217 unsigned short family) 1218 { 1219 struct xfrm_state *x; 1220 struct xfrm_state_walk *w; 1221 1222 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1223 list_for_each_entry(w, &net->xfrm.state_all, all) { 1224 x = container_of(w, struct xfrm_state, km); 1225 if (x->props.family != family || 1226 x->id.spi != spi) 1227 continue; 1228 1229 xfrm_state_hold(x); 1230 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1231 return x; 1232 } 1233 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1234 return NULL; 1235 } 1236 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1237 1238 static void __xfrm_state_insert(struct xfrm_state *x) 1239 { 1240 struct net *net = xs_net(x); 1241 unsigned int h; 1242 1243 list_add(&x->km.all, &net->xfrm.state_all); 1244 1245 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1246 x->props.reqid, x->props.family); 1247 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1248 1249 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1250 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1251 1252 if (x->id.spi) { 1253 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1254 x->props.family); 1255 1256 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1257 } 1258 1259 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); 1260 if (x->replay_maxage) 1261 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1262 1263 net->xfrm.state_num++; 1264 1265 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1266 } 1267 1268 /* net->xfrm.xfrm_state_lock is held */ 1269 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1270 { 1271 struct net *net = xs_net(xnew); 1272 unsigned short family = xnew->props.family; 1273 u32 reqid = xnew->props.reqid; 1274 struct xfrm_state *x; 1275 unsigned int h; 1276 u32 mark = xnew->mark.v & xnew->mark.m; 1277 u32 if_id = xnew->if_id; 1278 1279 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1280 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1281 if (x->props.family == family && 1282 x->props.reqid == reqid && 1283 x->if_id == if_id && 1284 (mark & x->mark.m) == x->mark.v && 1285 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1286 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1287 x->genid++; 1288 } 1289 } 1290 1291 void xfrm_state_insert(struct xfrm_state *x) 1292 { 1293 struct net *net = xs_net(x); 1294 1295 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1296 __xfrm_state_bump_genids(x); 1297 __xfrm_state_insert(x); 1298 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1299 } 1300 EXPORT_SYMBOL(xfrm_state_insert); 1301 1302 /* net->xfrm.xfrm_state_lock is held */ 1303 static struct xfrm_state *__find_acq_core(struct net *net, 1304 const struct xfrm_mark *m, 1305 unsigned short family, u8 mode, 1306 u32 reqid, u32 if_id, u8 proto, 1307 const xfrm_address_t *daddr, 1308 const xfrm_address_t *saddr, 1309 int create) 1310 { 1311 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1312 struct xfrm_state *x; 1313 u32 mark = m->v & m->m; 1314 1315 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1316 if (x->props.reqid != reqid || 1317 x->props.mode != mode || 1318 x->props.family != family || 1319 x->km.state != XFRM_STATE_ACQ || 1320 x->id.spi != 0 || 1321 x->id.proto != proto || 1322 (mark & x->mark.m) != x->mark.v || 1323 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1324 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1325 continue; 1326 1327 xfrm_state_hold(x); 1328 return x; 1329 } 1330 1331 if (!create) 1332 return NULL; 1333 1334 x = xfrm_state_alloc(net); 1335 if (likely(x)) { 1336 switch (family) { 1337 case AF_INET: 1338 x->sel.daddr.a4 = daddr->a4; 1339 x->sel.saddr.a4 = saddr->a4; 1340 x->sel.prefixlen_d = 32; 1341 x->sel.prefixlen_s = 32; 1342 x->props.saddr.a4 = saddr->a4; 1343 x->id.daddr.a4 = daddr->a4; 1344 break; 1345 1346 case AF_INET6: 1347 x->sel.daddr.in6 = daddr->in6; 1348 x->sel.saddr.in6 = saddr->in6; 1349 x->sel.prefixlen_d = 128; 1350 x->sel.prefixlen_s = 128; 1351 x->props.saddr.in6 = saddr->in6; 1352 x->id.daddr.in6 = daddr->in6; 1353 break; 1354 } 1355 1356 x->km.state = XFRM_STATE_ACQ; 1357 x->id.proto = proto; 1358 x->props.family = family; 1359 x->props.mode = mode; 1360 x->props.reqid = reqid; 1361 x->if_id = if_id; 1362 x->mark.v = m->v; 1363 x->mark.m = m->m; 1364 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1365 xfrm_state_hold(x); 1366 hrtimer_start(&x->mtimer, 1367 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1368 HRTIMER_MODE_REL_SOFT); 1369 list_add(&x->km.all, &net->xfrm.state_all); 1370 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1371 h = xfrm_src_hash(net, daddr, saddr, family); 1372 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1373 1374 net->xfrm.state_num++; 1375 1376 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1377 } 1378 1379 return x; 1380 } 1381 1382 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1383 1384 int xfrm_state_add(struct xfrm_state *x) 1385 { 1386 struct net *net = xs_net(x); 1387 struct xfrm_state *x1, *to_put; 1388 int family; 1389 int err; 1390 u32 mark = x->mark.v & x->mark.m; 1391 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1392 1393 family = x->props.family; 1394 1395 to_put = NULL; 1396 1397 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1398 1399 x1 = __xfrm_state_locate(x, use_spi, family); 1400 if (x1) { 1401 to_put = x1; 1402 x1 = NULL; 1403 err = -EEXIST; 1404 goto out; 1405 } 1406 1407 if (use_spi && x->km.seq) { 1408 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1409 if (x1 && ((x1->id.proto != x->id.proto) || 1410 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1411 to_put = x1; 1412 x1 = NULL; 1413 } 1414 } 1415 1416 if (use_spi && !x1) 1417 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1418 x->props.reqid, x->if_id, x->id.proto, 1419 &x->id.daddr, &x->props.saddr, 0); 1420 1421 __xfrm_state_bump_genids(x); 1422 __xfrm_state_insert(x); 1423 err = 0; 1424 1425 out: 1426 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1427 1428 if (x1) { 1429 xfrm_state_delete(x1); 1430 xfrm_state_put(x1); 1431 } 1432 1433 if (to_put) 1434 xfrm_state_put(to_put); 1435 1436 return err; 1437 } 1438 EXPORT_SYMBOL(xfrm_state_add); 1439 1440 #ifdef CONFIG_XFRM_MIGRATE 1441 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1442 struct xfrm_encap_tmpl *encap) 1443 { 1444 struct net *net = xs_net(orig); 1445 struct xfrm_state *x = xfrm_state_alloc(net); 1446 if (!x) 1447 goto out; 1448 1449 memcpy(&x->id, &orig->id, sizeof(x->id)); 1450 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1451 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1452 x->props.mode = orig->props.mode; 1453 x->props.replay_window = orig->props.replay_window; 1454 x->props.reqid = orig->props.reqid; 1455 x->props.family = orig->props.family; 1456 x->props.saddr = orig->props.saddr; 1457 1458 if (orig->aalg) { 1459 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1460 if (!x->aalg) 1461 goto error; 1462 } 1463 x->props.aalgo = orig->props.aalgo; 1464 1465 if (orig->aead) { 1466 x->aead = xfrm_algo_aead_clone(orig->aead); 1467 x->geniv = orig->geniv; 1468 if (!x->aead) 1469 goto error; 1470 } 1471 if (orig->ealg) { 1472 x->ealg = xfrm_algo_clone(orig->ealg); 1473 if (!x->ealg) 1474 goto error; 1475 } 1476 x->props.ealgo = orig->props.ealgo; 1477 1478 if (orig->calg) { 1479 x->calg = xfrm_algo_clone(orig->calg); 1480 if (!x->calg) 1481 goto error; 1482 } 1483 x->props.calgo = orig->props.calgo; 1484 1485 if (encap || orig->encap) { 1486 if (encap) 1487 x->encap = kmemdup(encap, sizeof(*x->encap), 1488 GFP_KERNEL); 1489 else 1490 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1491 GFP_KERNEL); 1492 1493 if (!x->encap) 1494 goto error; 1495 } 1496 1497 if (orig->coaddr) { 1498 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1499 GFP_KERNEL); 1500 if (!x->coaddr) 1501 goto error; 1502 } 1503 1504 if (orig->replay_esn) { 1505 if (xfrm_replay_clone(x, orig)) 1506 goto error; 1507 } 1508 1509 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1510 1511 if (xfrm_init_state(x) < 0) 1512 goto error; 1513 1514 x->props.flags = orig->props.flags; 1515 x->props.extra_flags = orig->props.extra_flags; 1516 1517 x->if_id = orig->if_id; 1518 x->tfcpad = orig->tfcpad; 1519 x->replay_maxdiff = orig->replay_maxdiff; 1520 x->replay_maxage = orig->replay_maxage; 1521 x->curlft.add_time = orig->curlft.add_time; 1522 x->km.state = orig->km.state; 1523 x->km.seq = orig->km.seq; 1524 x->replay = orig->replay; 1525 x->preplay = orig->preplay; 1526 1527 return x; 1528 1529 error: 1530 xfrm_state_put(x); 1531 out: 1532 return NULL; 1533 } 1534 1535 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1536 { 1537 unsigned int h; 1538 struct xfrm_state *x = NULL; 1539 1540 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1541 1542 if (m->reqid) { 1543 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1544 m->reqid, m->old_family); 1545 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1546 if (x->props.mode != m->mode || 1547 x->id.proto != m->proto) 1548 continue; 1549 if (m->reqid && x->props.reqid != m->reqid) 1550 continue; 1551 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1552 m->old_family) || 1553 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1554 m->old_family)) 1555 continue; 1556 xfrm_state_hold(x); 1557 break; 1558 } 1559 } else { 1560 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1561 m->old_family); 1562 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1563 if (x->props.mode != m->mode || 1564 x->id.proto != m->proto) 1565 continue; 1566 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1567 m->old_family) || 1568 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1569 m->old_family)) 1570 continue; 1571 xfrm_state_hold(x); 1572 break; 1573 } 1574 } 1575 1576 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1577 1578 return x; 1579 } 1580 EXPORT_SYMBOL(xfrm_migrate_state_find); 1581 1582 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1583 struct xfrm_migrate *m, 1584 struct xfrm_encap_tmpl *encap) 1585 { 1586 struct xfrm_state *xc; 1587 1588 xc = xfrm_state_clone(x, encap); 1589 if (!xc) 1590 return NULL; 1591 1592 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1593 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1594 1595 /* add state */ 1596 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1597 /* a care is needed when the destination address of the 1598 state is to be updated as it is a part of triplet */ 1599 xfrm_state_insert(xc); 1600 } else { 1601 if (xfrm_state_add(xc) < 0) 1602 goto error; 1603 } 1604 1605 return xc; 1606 error: 1607 xfrm_state_put(xc); 1608 return NULL; 1609 } 1610 EXPORT_SYMBOL(xfrm_state_migrate); 1611 #endif 1612 1613 int xfrm_state_update(struct xfrm_state *x) 1614 { 1615 struct xfrm_state *x1, *to_put; 1616 int err; 1617 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1618 struct net *net = xs_net(x); 1619 1620 to_put = NULL; 1621 1622 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1623 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1624 1625 err = -ESRCH; 1626 if (!x1) 1627 goto out; 1628 1629 if (xfrm_state_kern(x1)) { 1630 to_put = x1; 1631 err = -EEXIST; 1632 goto out; 1633 } 1634 1635 if (x1->km.state == XFRM_STATE_ACQ) { 1636 __xfrm_state_insert(x); 1637 x = NULL; 1638 } 1639 err = 0; 1640 1641 out: 1642 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1643 1644 if (to_put) 1645 xfrm_state_put(to_put); 1646 1647 if (err) 1648 return err; 1649 1650 if (!x) { 1651 xfrm_state_delete(x1); 1652 xfrm_state_put(x1); 1653 return 0; 1654 } 1655 1656 err = -EINVAL; 1657 spin_lock_bh(&x1->lock); 1658 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1659 if (x->encap && x1->encap && 1660 x->encap->encap_type == x1->encap->encap_type) 1661 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1662 else if (x->encap || x1->encap) 1663 goto fail; 1664 1665 if (x->coaddr && x1->coaddr) { 1666 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1667 } 1668 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1669 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1670 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1671 x1->km.dying = 0; 1672 1673 hrtimer_start(&x1->mtimer, ktime_set(1, 0), 1674 HRTIMER_MODE_REL_SOFT); 1675 if (x1->curlft.use_time) 1676 xfrm_state_check_expire(x1); 1677 1678 if (x->props.smark.m || x->props.smark.v || x->if_id) { 1679 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1680 1681 if (x->props.smark.m || x->props.smark.v) 1682 x1->props.smark = x->props.smark; 1683 1684 if (x->if_id) 1685 x1->if_id = x->if_id; 1686 1687 __xfrm_state_bump_genids(x1); 1688 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1689 } 1690 1691 err = 0; 1692 x->km.state = XFRM_STATE_DEAD; 1693 __xfrm_state_put(x); 1694 } 1695 1696 fail: 1697 spin_unlock_bh(&x1->lock); 1698 1699 xfrm_state_put(x1); 1700 1701 return err; 1702 } 1703 EXPORT_SYMBOL(xfrm_state_update); 1704 1705 int xfrm_state_check_expire(struct xfrm_state *x) 1706 { 1707 if (!x->curlft.use_time) 1708 x->curlft.use_time = ktime_get_real_seconds(); 1709 1710 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1711 x->curlft.packets >= x->lft.hard_packet_limit) { 1712 x->km.state = XFRM_STATE_EXPIRED; 1713 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); 1714 return -EINVAL; 1715 } 1716 1717 if (!x->km.dying && 1718 (x->curlft.bytes >= x->lft.soft_byte_limit || 1719 x->curlft.packets >= x->lft.soft_packet_limit)) { 1720 x->km.dying = 1; 1721 km_state_expired(x, 0, 0); 1722 } 1723 return 0; 1724 } 1725 EXPORT_SYMBOL(xfrm_state_check_expire); 1726 1727 struct xfrm_state * 1728 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1729 u8 proto, unsigned short family) 1730 { 1731 struct xfrm_state *x; 1732 1733 rcu_read_lock(); 1734 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1735 rcu_read_unlock(); 1736 return x; 1737 } 1738 EXPORT_SYMBOL(xfrm_state_lookup); 1739 1740 struct xfrm_state * 1741 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1742 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1743 u8 proto, unsigned short family) 1744 { 1745 struct xfrm_state *x; 1746 1747 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1748 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1749 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1750 return x; 1751 } 1752 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1753 1754 struct xfrm_state * 1755 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1756 u32 if_id, u8 proto, const xfrm_address_t *daddr, 1757 const xfrm_address_t *saddr, int create, unsigned short family) 1758 { 1759 struct xfrm_state *x; 1760 1761 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1762 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create); 1763 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1764 1765 return x; 1766 } 1767 EXPORT_SYMBOL(xfrm_find_acq); 1768 1769 #ifdef CONFIG_XFRM_SUB_POLICY 1770 #if IS_ENABLED(CONFIG_IPV6) 1771 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 1772 static void 1773 __xfrm6_sort(void **dst, void **src, int n, 1774 int (*cmp)(const void *p), int maxclass) 1775 { 1776 int count[XFRM_MAX_DEPTH] = { }; 1777 int class[XFRM_MAX_DEPTH]; 1778 int i; 1779 1780 for (i = 0; i < n; i++) { 1781 int c = cmp(src[i]); 1782 1783 class[i] = c; 1784 count[c]++; 1785 } 1786 1787 for (i = 2; i < maxclass; i++) 1788 count[i] += count[i - 1]; 1789 1790 for (i = 0; i < n; i++) { 1791 dst[count[class[i] - 1]++] = src[i]; 1792 src[i] = NULL; 1793 } 1794 } 1795 1796 /* Rule for xfrm_state: 1797 * 1798 * rule 1: select IPsec transport except AH 1799 * rule 2: select MIPv6 RO or inbound trigger 1800 * rule 3: select IPsec transport AH 1801 * rule 4: select IPsec tunnel 1802 * rule 5: others 1803 */ 1804 static int __xfrm6_state_sort_cmp(const void *p) 1805 { 1806 const struct xfrm_state *v = p; 1807 1808 switch (v->props.mode) { 1809 case XFRM_MODE_TRANSPORT: 1810 if (v->id.proto != IPPROTO_AH) 1811 return 1; 1812 else 1813 return 3; 1814 #if IS_ENABLED(CONFIG_IPV6_MIP6) 1815 case XFRM_MODE_ROUTEOPTIMIZATION: 1816 case XFRM_MODE_IN_TRIGGER: 1817 return 2; 1818 #endif 1819 case XFRM_MODE_TUNNEL: 1820 case XFRM_MODE_BEET: 1821 return 4; 1822 } 1823 return 5; 1824 } 1825 1826 /* Rule for xfrm_tmpl: 1827 * 1828 * rule 1: select IPsec transport 1829 * rule 2: select MIPv6 RO or inbound trigger 1830 * rule 3: select IPsec tunnel 1831 * rule 4: others 1832 */ 1833 static int __xfrm6_tmpl_sort_cmp(const void *p) 1834 { 1835 const struct xfrm_tmpl *v = p; 1836 1837 switch (v->mode) { 1838 case XFRM_MODE_TRANSPORT: 1839 return 1; 1840 #if IS_ENABLED(CONFIG_IPV6_MIP6) 1841 case XFRM_MODE_ROUTEOPTIMIZATION: 1842 case XFRM_MODE_IN_TRIGGER: 1843 return 2; 1844 #endif 1845 case XFRM_MODE_TUNNEL: 1846 case XFRM_MODE_BEET: 1847 return 3; 1848 } 1849 return 4; 1850 } 1851 #else 1852 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } 1853 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } 1854 1855 static inline void 1856 __xfrm6_sort(void **dst, void **src, int n, 1857 int (*cmp)(const void *p), int maxclass) 1858 { 1859 int i; 1860 1861 for (i = 0; i < n; i++) 1862 dst[i] = src[i]; 1863 } 1864 #endif /* CONFIG_IPV6 */ 1865 1866 void 1867 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1868 unsigned short family) 1869 { 1870 int i; 1871 1872 if (family == AF_INET6) 1873 __xfrm6_sort((void **)dst, (void **)src, n, 1874 __xfrm6_tmpl_sort_cmp, 5); 1875 else 1876 for (i = 0; i < n; i++) 1877 dst[i] = src[i]; 1878 } 1879 1880 void 1881 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1882 unsigned short family) 1883 { 1884 int i; 1885 1886 if (family == AF_INET6) 1887 __xfrm6_sort((void **)dst, (void **)src, n, 1888 __xfrm6_state_sort_cmp, 6); 1889 else 1890 for (i = 0; i < n; i++) 1891 dst[i] = src[i]; 1892 } 1893 #endif 1894 1895 /* Silly enough, but I'm lazy to build resolution list */ 1896 1897 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1898 { 1899 int i; 1900 1901 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1902 struct xfrm_state *x; 1903 1904 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1905 if (x->km.seq == seq && 1906 (mark & x->mark.m) == x->mark.v && 1907 x->km.state == XFRM_STATE_ACQ) { 1908 xfrm_state_hold(x); 1909 return x; 1910 } 1911 } 1912 } 1913 return NULL; 1914 } 1915 1916 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1917 { 1918 struct xfrm_state *x; 1919 1920 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1921 x = __xfrm_find_acq_byseq(net, mark, seq); 1922 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1923 return x; 1924 } 1925 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1926 1927 u32 xfrm_get_acqseq(void) 1928 { 1929 u32 res; 1930 static atomic_t acqseq; 1931 1932 do { 1933 res = atomic_inc_return(&acqseq); 1934 } while (!res); 1935 1936 return res; 1937 } 1938 EXPORT_SYMBOL(xfrm_get_acqseq); 1939 1940 int verify_spi_info(u8 proto, u32 min, u32 max) 1941 { 1942 switch (proto) { 1943 case IPPROTO_AH: 1944 case IPPROTO_ESP: 1945 break; 1946 1947 case IPPROTO_COMP: 1948 /* IPCOMP spi is 16-bits. */ 1949 if (max >= 0x10000) 1950 return -EINVAL; 1951 break; 1952 1953 default: 1954 return -EINVAL; 1955 } 1956 1957 if (min > max) 1958 return -EINVAL; 1959 1960 return 0; 1961 } 1962 EXPORT_SYMBOL(verify_spi_info); 1963 1964 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1965 { 1966 struct net *net = xs_net(x); 1967 unsigned int h; 1968 struct xfrm_state *x0; 1969 int err = -ENOENT; 1970 __be32 minspi = htonl(low); 1971 __be32 maxspi = htonl(high); 1972 u32 mark = x->mark.v & x->mark.m; 1973 1974 spin_lock_bh(&x->lock); 1975 if (x->km.state == XFRM_STATE_DEAD) 1976 goto unlock; 1977 1978 err = 0; 1979 if (x->id.spi) 1980 goto unlock; 1981 1982 err = -ENOENT; 1983 1984 if (minspi == maxspi) { 1985 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1986 if (x0) { 1987 xfrm_state_put(x0); 1988 goto unlock; 1989 } 1990 x->id.spi = minspi; 1991 } else { 1992 u32 spi = 0; 1993 for (h = 0; h < high-low+1; h++) { 1994 spi = low + prandom_u32()%(high-low+1); 1995 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1996 if (x0 == NULL) { 1997 x->id.spi = htonl(spi); 1998 break; 1999 } 2000 xfrm_state_put(x0); 2001 } 2002 } 2003 if (x->id.spi) { 2004 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2005 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 2006 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 2007 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2008 2009 err = 0; 2010 } 2011 2012 unlock: 2013 spin_unlock_bh(&x->lock); 2014 2015 return err; 2016 } 2017 EXPORT_SYMBOL(xfrm_alloc_spi); 2018 2019 static bool __xfrm_state_filter_match(struct xfrm_state *x, 2020 struct xfrm_address_filter *filter) 2021 { 2022 if (filter) { 2023 if ((filter->family == AF_INET || 2024 filter->family == AF_INET6) && 2025 x->props.family != filter->family) 2026 return false; 2027 2028 return addr_match(&x->props.saddr, &filter->saddr, 2029 filter->splen) && 2030 addr_match(&x->id.daddr, &filter->daddr, 2031 filter->dplen); 2032 } 2033 return true; 2034 } 2035 2036 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 2037 int (*func)(struct xfrm_state *, int, void*), 2038 void *data) 2039 { 2040 struct xfrm_state *state; 2041 struct xfrm_state_walk *x; 2042 int err = 0; 2043 2044 if (walk->seq != 0 && list_empty(&walk->all)) 2045 return 0; 2046 2047 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2048 if (list_empty(&walk->all)) 2049 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 2050 else 2051 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 2052 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 2053 if (x->state == XFRM_STATE_DEAD) 2054 continue; 2055 state = container_of(x, struct xfrm_state, km); 2056 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 2057 continue; 2058 if (!__xfrm_state_filter_match(state, walk->filter)) 2059 continue; 2060 err = func(state, walk->seq, data); 2061 if (err) { 2062 list_move_tail(&walk->all, &x->all); 2063 goto out; 2064 } 2065 walk->seq++; 2066 } 2067 if (walk->seq == 0) { 2068 err = -ENOENT; 2069 goto out; 2070 } 2071 list_del_init(&walk->all); 2072 out: 2073 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2074 return err; 2075 } 2076 EXPORT_SYMBOL(xfrm_state_walk); 2077 2078 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 2079 struct xfrm_address_filter *filter) 2080 { 2081 INIT_LIST_HEAD(&walk->all); 2082 walk->proto = proto; 2083 walk->state = XFRM_STATE_DEAD; 2084 walk->seq = 0; 2085 walk->filter = filter; 2086 } 2087 EXPORT_SYMBOL(xfrm_state_walk_init); 2088 2089 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 2090 { 2091 kfree(walk->filter); 2092 2093 if (list_empty(&walk->all)) 2094 return; 2095 2096 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2097 list_del(&walk->all); 2098 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2099 } 2100 EXPORT_SYMBOL(xfrm_state_walk_done); 2101 2102 static void xfrm_replay_timer_handler(struct timer_list *t) 2103 { 2104 struct xfrm_state *x = from_timer(x, t, rtimer); 2105 2106 spin_lock(&x->lock); 2107 2108 if (x->km.state == XFRM_STATE_VALID) { 2109 if (xfrm_aevent_is_on(xs_net(x))) 2110 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 2111 else 2112 x->xflags |= XFRM_TIME_DEFER; 2113 } 2114 2115 spin_unlock(&x->lock); 2116 } 2117 2118 static LIST_HEAD(xfrm_km_list); 2119 2120 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2121 { 2122 struct xfrm_mgr *km; 2123 2124 rcu_read_lock(); 2125 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2126 if (km->notify_policy) 2127 km->notify_policy(xp, dir, c); 2128 rcu_read_unlock(); 2129 } 2130 2131 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 2132 { 2133 struct xfrm_mgr *km; 2134 rcu_read_lock(); 2135 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2136 if (km->notify) 2137 km->notify(x, c); 2138 rcu_read_unlock(); 2139 } 2140 2141 EXPORT_SYMBOL(km_policy_notify); 2142 EXPORT_SYMBOL(km_state_notify); 2143 2144 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 2145 { 2146 struct km_event c; 2147 2148 c.data.hard = hard; 2149 c.portid = portid; 2150 c.event = XFRM_MSG_EXPIRE; 2151 km_state_notify(x, &c); 2152 } 2153 2154 EXPORT_SYMBOL(km_state_expired); 2155 /* 2156 * We send to all registered managers regardless of failure 2157 * We are happy with one success 2158 */ 2159 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 2160 { 2161 int err = -EINVAL, acqret; 2162 struct xfrm_mgr *km; 2163 2164 rcu_read_lock(); 2165 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2166 acqret = km->acquire(x, t, pol); 2167 if (!acqret) 2168 err = acqret; 2169 } 2170 rcu_read_unlock(); 2171 return err; 2172 } 2173 EXPORT_SYMBOL(km_query); 2174 2175 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2176 { 2177 int err = -EINVAL; 2178 struct xfrm_mgr *km; 2179 2180 rcu_read_lock(); 2181 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2182 if (km->new_mapping) 2183 err = km->new_mapping(x, ipaddr, sport); 2184 if (!err) 2185 break; 2186 } 2187 rcu_read_unlock(); 2188 return err; 2189 } 2190 EXPORT_SYMBOL(km_new_mapping); 2191 2192 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2193 { 2194 struct km_event c; 2195 2196 c.data.hard = hard; 2197 c.portid = portid; 2198 c.event = XFRM_MSG_POLEXPIRE; 2199 km_policy_notify(pol, dir, &c); 2200 } 2201 EXPORT_SYMBOL(km_policy_expired); 2202 2203 #ifdef CONFIG_XFRM_MIGRATE 2204 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2205 const struct xfrm_migrate *m, int num_migrate, 2206 const struct xfrm_kmaddress *k, 2207 const struct xfrm_encap_tmpl *encap) 2208 { 2209 int err = -EINVAL; 2210 int ret; 2211 struct xfrm_mgr *km; 2212 2213 rcu_read_lock(); 2214 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2215 if (km->migrate) { 2216 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2217 encap); 2218 if (!ret) 2219 err = ret; 2220 } 2221 } 2222 rcu_read_unlock(); 2223 return err; 2224 } 2225 EXPORT_SYMBOL(km_migrate); 2226 #endif 2227 2228 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2229 { 2230 int err = -EINVAL; 2231 int ret; 2232 struct xfrm_mgr *km; 2233 2234 rcu_read_lock(); 2235 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2236 if (km->report) { 2237 ret = km->report(net, proto, sel, addr); 2238 if (!ret) 2239 err = ret; 2240 } 2241 } 2242 rcu_read_unlock(); 2243 return err; 2244 } 2245 EXPORT_SYMBOL(km_report); 2246 2247 static bool km_is_alive(const struct km_event *c) 2248 { 2249 struct xfrm_mgr *km; 2250 bool is_alive = false; 2251 2252 rcu_read_lock(); 2253 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2254 if (km->is_alive && km->is_alive(c)) { 2255 is_alive = true; 2256 break; 2257 } 2258 } 2259 rcu_read_unlock(); 2260 2261 return is_alive; 2262 } 2263 2264 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 2265 { 2266 int err; 2267 u8 *data; 2268 struct xfrm_mgr *km; 2269 struct xfrm_policy *pol = NULL; 2270 2271 if (in_compat_syscall()) 2272 return -EOPNOTSUPP; 2273 2274 if (!optval && !optlen) { 2275 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2276 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2277 __sk_dst_reset(sk); 2278 return 0; 2279 } 2280 2281 if (optlen <= 0 || optlen > PAGE_SIZE) 2282 return -EMSGSIZE; 2283 2284 data = memdup_user(optval, optlen); 2285 if (IS_ERR(data)) 2286 return PTR_ERR(data); 2287 2288 err = -EINVAL; 2289 rcu_read_lock(); 2290 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2291 pol = km->compile_policy(sk, optname, data, 2292 optlen, &err); 2293 if (err >= 0) 2294 break; 2295 } 2296 rcu_read_unlock(); 2297 2298 if (err >= 0) { 2299 xfrm_sk_policy_insert(sk, err, pol); 2300 xfrm_pol_put(pol); 2301 __sk_dst_reset(sk); 2302 err = 0; 2303 } 2304 2305 kfree(data); 2306 return err; 2307 } 2308 EXPORT_SYMBOL(xfrm_user_policy); 2309 2310 static DEFINE_SPINLOCK(xfrm_km_lock); 2311 2312 int xfrm_register_km(struct xfrm_mgr *km) 2313 { 2314 spin_lock_bh(&xfrm_km_lock); 2315 list_add_tail_rcu(&km->list, &xfrm_km_list); 2316 spin_unlock_bh(&xfrm_km_lock); 2317 return 0; 2318 } 2319 EXPORT_SYMBOL(xfrm_register_km); 2320 2321 int xfrm_unregister_km(struct xfrm_mgr *km) 2322 { 2323 spin_lock_bh(&xfrm_km_lock); 2324 list_del_rcu(&km->list); 2325 spin_unlock_bh(&xfrm_km_lock); 2326 synchronize_rcu(); 2327 return 0; 2328 } 2329 EXPORT_SYMBOL(xfrm_unregister_km); 2330 2331 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 2332 { 2333 int err = 0; 2334 2335 if (WARN_ON(afinfo->family >= NPROTO)) 2336 return -EAFNOSUPPORT; 2337 2338 spin_lock_bh(&xfrm_state_afinfo_lock); 2339 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 2340 err = -EEXIST; 2341 else 2342 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 2343 spin_unlock_bh(&xfrm_state_afinfo_lock); 2344 return err; 2345 } 2346 EXPORT_SYMBOL(xfrm_state_register_afinfo); 2347 2348 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 2349 { 2350 int err = 0, family = afinfo->family; 2351 2352 if (WARN_ON(family >= NPROTO)) 2353 return -EAFNOSUPPORT; 2354 2355 spin_lock_bh(&xfrm_state_afinfo_lock); 2356 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 2357 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 2358 err = -EINVAL; 2359 else 2360 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 2361 } 2362 spin_unlock_bh(&xfrm_state_afinfo_lock); 2363 synchronize_rcu(); 2364 return err; 2365 } 2366 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 2367 2368 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 2369 { 2370 if (unlikely(family >= NPROTO)) 2371 return NULL; 2372 2373 return rcu_dereference(xfrm_state_afinfo[family]); 2374 } 2375 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); 2376 2377 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 2378 { 2379 struct xfrm_state_afinfo *afinfo; 2380 if (unlikely(family >= NPROTO)) 2381 return NULL; 2382 rcu_read_lock(); 2383 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 2384 if (unlikely(!afinfo)) 2385 rcu_read_unlock(); 2386 return afinfo; 2387 } 2388 2389 void xfrm_flush_gc(void) 2390 { 2391 flush_work(&xfrm_state_gc_work); 2392 } 2393 EXPORT_SYMBOL(xfrm_flush_gc); 2394 2395 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 2396 void xfrm_state_delete_tunnel(struct xfrm_state *x) 2397 { 2398 if (x->tunnel) { 2399 struct xfrm_state *t = x->tunnel; 2400 2401 if (atomic_read(&t->tunnel_users) == 2) 2402 xfrm_state_delete(t); 2403 atomic_dec(&t->tunnel_users); 2404 xfrm_state_put_sync(t); 2405 x->tunnel = NULL; 2406 } 2407 } 2408 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 2409 2410 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) 2411 { 2412 const struct xfrm_type *type = READ_ONCE(x->type); 2413 struct crypto_aead *aead; 2414 u32 blksize, net_adj = 0; 2415 2416 if (x->km.state != XFRM_STATE_VALID || 2417 !type || type->proto != IPPROTO_ESP) 2418 return mtu - x->props.header_len; 2419 2420 aead = x->data; 2421 blksize = ALIGN(crypto_aead_blocksize(aead), 4); 2422 2423 switch (x->props.mode) { 2424 case XFRM_MODE_TRANSPORT: 2425 case XFRM_MODE_BEET: 2426 if (x->props.family == AF_INET) 2427 net_adj = sizeof(struct iphdr); 2428 else if (x->props.family == AF_INET6) 2429 net_adj = sizeof(struct ipv6hdr); 2430 break; 2431 case XFRM_MODE_TUNNEL: 2432 break; 2433 default: 2434 WARN_ON_ONCE(1); 2435 break; 2436 } 2437 2438 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - 2439 net_adj) & ~(blksize - 1)) + net_adj - 2; 2440 } 2441 EXPORT_SYMBOL_GPL(xfrm_state_mtu); 2442 2443 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) 2444 { 2445 const struct xfrm_mode *inner_mode; 2446 const struct xfrm_mode *outer_mode; 2447 int family = x->props.family; 2448 int err; 2449 2450 if (family == AF_INET && 2451 xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc) 2452 x->props.flags |= XFRM_STATE_NOPMTUDISC; 2453 2454 err = -EPROTONOSUPPORT; 2455 2456 if (x->sel.family != AF_UNSPEC) { 2457 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 2458 if (inner_mode == NULL) 2459 goto error; 2460 2461 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 2462 family != x->sel.family) 2463 goto error; 2464 2465 x->inner_mode = *inner_mode; 2466 } else { 2467 const struct xfrm_mode *inner_mode_iaf; 2468 int iafamily = AF_INET; 2469 2470 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 2471 if (inner_mode == NULL) 2472 goto error; 2473 2474 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 2475 goto error; 2476 2477 x->inner_mode = *inner_mode; 2478 2479 if (x->props.family == AF_INET) 2480 iafamily = AF_INET6; 2481 2482 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2483 if (inner_mode_iaf) { 2484 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2485 x->inner_mode_iaf = *inner_mode_iaf; 2486 } 2487 } 2488 2489 x->type = xfrm_get_type(x->id.proto, family); 2490 if (x->type == NULL) 2491 goto error; 2492 2493 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); 2494 2495 err = x->type->init_state(x); 2496 if (err) 2497 goto error; 2498 2499 outer_mode = xfrm_get_mode(x->props.mode, family); 2500 if (!outer_mode) { 2501 err = -EPROTONOSUPPORT; 2502 goto error; 2503 } 2504 2505 x->outer_mode = *outer_mode; 2506 if (init_replay) { 2507 err = xfrm_init_replay(x); 2508 if (err) 2509 goto error; 2510 } 2511 2512 error: 2513 return err; 2514 } 2515 2516 EXPORT_SYMBOL(__xfrm_init_state); 2517 2518 int xfrm_init_state(struct xfrm_state *x) 2519 { 2520 int err; 2521 2522 err = __xfrm_init_state(x, true, false); 2523 if (!err) 2524 x->km.state = XFRM_STATE_VALID; 2525 2526 return err; 2527 } 2528 2529 EXPORT_SYMBOL(xfrm_init_state); 2530 2531 int __net_init xfrm_state_init(struct net *net) 2532 { 2533 unsigned int sz; 2534 2535 if (net_eq(net, &init_net)) 2536 xfrm_state_cache = KMEM_CACHE(xfrm_state, 2537 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 2538 2539 INIT_LIST_HEAD(&net->xfrm.state_all); 2540 2541 sz = sizeof(struct hlist_head) * 8; 2542 2543 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2544 if (!net->xfrm.state_bydst) 2545 goto out_bydst; 2546 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2547 if (!net->xfrm.state_bysrc) 2548 goto out_bysrc; 2549 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2550 if (!net->xfrm.state_byspi) 2551 goto out_byspi; 2552 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2553 2554 net->xfrm.state_num = 0; 2555 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2556 spin_lock_init(&net->xfrm.xfrm_state_lock); 2557 return 0; 2558 2559 out_byspi: 2560 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2561 out_bysrc: 2562 xfrm_hash_free(net->xfrm.state_bydst, sz); 2563 out_bydst: 2564 return -ENOMEM; 2565 } 2566 2567 void xfrm_state_fini(struct net *net) 2568 { 2569 unsigned int sz; 2570 2571 flush_work(&net->xfrm.state_hash_work); 2572 flush_work(&xfrm_state_gc_work); 2573 xfrm_state_flush(net, 0, false, true); 2574 2575 WARN_ON(!list_empty(&net->xfrm.state_all)); 2576 2577 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2578 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2579 xfrm_hash_free(net->xfrm.state_byspi, sz); 2580 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2581 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2582 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2583 xfrm_hash_free(net->xfrm.state_bydst, sz); 2584 } 2585 2586 #ifdef CONFIG_AUDITSYSCALL 2587 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2588 struct audit_buffer *audit_buf) 2589 { 2590 struct xfrm_sec_ctx *ctx = x->security; 2591 u32 spi = ntohl(x->id.spi); 2592 2593 if (ctx) 2594 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2595 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2596 2597 switch (x->props.family) { 2598 case AF_INET: 2599 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2600 &x->props.saddr.a4, &x->id.daddr.a4); 2601 break; 2602 case AF_INET6: 2603 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2604 x->props.saddr.a6, x->id.daddr.a6); 2605 break; 2606 } 2607 2608 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2609 } 2610 2611 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2612 struct audit_buffer *audit_buf) 2613 { 2614 const struct iphdr *iph4; 2615 const struct ipv6hdr *iph6; 2616 2617 switch (family) { 2618 case AF_INET: 2619 iph4 = ip_hdr(skb); 2620 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2621 &iph4->saddr, &iph4->daddr); 2622 break; 2623 case AF_INET6: 2624 iph6 = ipv6_hdr(skb); 2625 audit_log_format(audit_buf, 2626 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2627 &iph6->saddr, &iph6->daddr, 2628 iph6->flow_lbl[0] & 0x0f, 2629 iph6->flow_lbl[1], 2630 iph6->flow_lbl[2]); 2631 break; 2632 } 2633 } 2634 2635 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 2636 { 2637 struct audit_buffer *audit_buf; 2638 2639 audit_buf = xfrm_audit_start("SAD-add"); 2640 if (audit_buf == NULL) 2641 return; 2642 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2643 xfrm_audit_helper_sainfo(x, audit_buf); 2644 audit_log_format(audit_buf, " res=%u", result); 2645 audit_log_end(audit_buf); 2646 } 2647 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2648 2649 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 2650 { 2651 struct audit_buffer *audit_buf; 2652 2653 audit_buf = xfrm_audit_start("SAD-delete"); 2654 if (audit_buf == NULL) 2655 return; 2656 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2657 xfrm_audit_helper_sainfo(x, audit_buf); 2658 audit_log_format(audit_buf, " res=%u", result); 2659 audit_log_end(audit_buf); 2660 } 2661 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2662 2663 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2664 struct sk_buff *skb) 2665 { 2666 struct audit_buffer *audit_buf; 2667 u32 spi; 2668 2669 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2670 if (audit_buf == NULL) 2671 return; 2672 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2673 /* don't record the sequence number because it's inherent in this kind 2674 * of audit message */ 2675 spi = ntohl(x->id.spi); 2676 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2677 audit_log_end(audit_buf); 2678 } 2679 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2680 2681 void xfrm_audit_state_replay(struct xfrm_state *x, 2682 struct sk_buff *skb, __be32 net_seq) 2683 { 2684 struct audit_buffer *audit_buf; 2685 u32 spi; 2686 2687 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2688 if (audit_buf == NULL) 2689 return; 2690 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2691 spi = ntohl(x->id.spi); 2692 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2693 spi, spi, ntohl(net_seq)); 2694 audit_log_end(audit_buf); 2695 } 2696 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2697 2698 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2699 { 2700 struct audit_buffer *audit_buf; 2701 2702 audit_buf = xfrm_audit_start("SA-notfound"); 2703 if (audit_buf == NULL) 2704 return; 2705 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2706 audit_log_end(audit_buf); 2707 } 2708 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2709 2710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2711 __be32 net_spi, __be32 net_seq) 2712 { 2713 struct audit_buffer *audit_buf; 2714 u32 spi; 2715 2716 audit_buf = xfrm_audit_start("SA-notfound"); 2717 if (audit_buf == NULL) 2718 return; 2719 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2720 spi = ntohl(net_spi); 2721 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2722 spi, spi, ntohl(net_seq)); 2723 audit_log_end(audit_buf); 2724 } 2725 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2726 2727 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2728 struct sk_buff *skb, u8 proto) 2729 { 2730 struct audit_buffer *audit_buf; 2731 __be32 net_spi; 2732 __be32 net_seq; 2733 2734 audit_buf = xfrm_audit_start("SA-icv-failure"); 2735 if (audit_buf == NULL) 2736 return; 2737 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2738 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2739 u32 spi = ntohl(net_spi); 2740 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2741 spi, spi, ntohl(net_seq)); 2742 } 2743 audit_log_end(audit_buf); 2744 } 2745 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2746 #endif /* CONFIG_AUDITSYSCALL */ 2747