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_zalloc(xfrm_state_cache, GFP_ATOMIC); 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 if (x->encap_sk) 674 sock_put(rcu_dereference_raw(x->encap_sk)); 675 676 xfrm_dev_state_delete(x); 677 678 /* All xfrm_state objects are created by xfrm_state_alloc. 679 * The xfrm_state_alloc call gives a reference, and that 680 * is what we are dropping here. 681 */ 682 xfrm_state_put(x); 683 err = 0; 684 } 685 686 return err; 687 } 688 EXPORT_SYMBOL(__xfrm_state_delete); 689 690 int xfrm_state_delete(struct xfrm_state *x) 691 { 692 int err; 693 694 spin_lock_bh(&x->lock); 695 err = __xfrm_state_delete(x); 696 spin_unlock_bh(&x->lock); 697 698 return err; 699 } 700 EXPORT_SYMBOL(xfrm_state_delete); 701 702 #ifdef CONFIG_SECURITY_NETWORK_XFRM 703 static inline int 704 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 705 { 706 int i, err = 0; 707 708 for (i = 0; i <= net->xfrm.state_hmask; i++) { 709 struct xfrm_state *x; 710 711 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 712 if (xfrm_id_proto_match(x->id.proto, proto) && 713 (err = security_xfrm_state_delete(x)) != 0) { 714 xfrm_audit_state_delete(x, 0, task_valid); 715 return err; 716 } 717 } 718 } 719 720 return err; 721 } 722 723 static inline int 724 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 725 { 726 int i, err = 0; 727 728 for (i = 0; i <= net->xfrm.state_hmask; i++) { 729 struct xfrm_state *x; 730 struct xfrm_state_offload *xso; 731 732 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 733 xso = &x->xso; 734 735 if (xso->dev == dev && 736 (err = security_xfrm_state_delete(x)) != 0) { 737 xfrm_audit_state_delete(x, 0, task_valid); 738 return err; 739 } 740 } 741 } 742 743 return err; 744 } 745 #else 746 static inline int 747 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 748 { 749 return 0; 750 } 751 752 static inline int 753 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 754 { 755 return 0; 756 } 757 #endif 758 759 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync) 760 { 761 int i, err = 0, cnt = 0; 762 763 spin_lock_bh(&net->xfrm.xfrm_state_lock); 764 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 765 if (err) 766 goto out; 767 768 err = -ESRCH; 769 for (i = 0; i <= net->xfrm.state_hmask; i++) { 770 struct xfrm_state *x; 771 restart: 772 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 773 if (!xfrm_state_kern(x) && 774 xfrm_id_proto_match(x->id.proto, proto)) { 775 xfrm_state_hold(x); 776 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 777 778 err = xfrm_state_delete(x); 779 xfrm_audit_state_delete(x, err ? 0 : 1, 780 task_valid); 781 if (sync) 782 xfrm_state_put_sync(x); 783 else 784 xfrm_state_put(x); 785 if (!err) 786 cnt++; 787 788 spin_lock_bh(&net->xfrm.xfrm_state_lock); 789 goto restart; 790 } 791 } 792 } 793 out: 794 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 795 if (cnt) 796 err = 0; 797 798 return err; 799 } 800 EXPORT_SYMBOL(xfrm_state_flush); 801 802 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 803 { 804 int i, err = 0, cnt = 0; 805 806 spin_lock_bh(&net->xfrm.xfrm_state_lock); 807 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 808 if (err) 809 goto out; 810 811 err = -ESRCH; 812 for (i = 0; i <= net->xfrm.state_hmask; i++) { 813 struct xfrm_state *x; 814 struct xfrm_state_offload *xso; 815 restart: 816 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 817 xso = &x->xso; 818 819 if (!xfrm_state_kern(x) && xso->dev == dev) { 820 xfrm_state_hold(x); 821 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 822 823 err = xfrm_state_delete(x); 824 xfrm_audit_state_delete(x, err ? 0 : 1, 825 task_valid); 826 xfrm_state_put(x); 827 if (!err) 828 cnt++; 829 830 spin_lock_bh(&net->xfrm.xfrm_state_lock); 831 goto restart; 832 } 833 } 834 } 835 if (cnt) 836 err = 0; 837 838 out: 839 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 840 return err; 841 } 842 EXPORT_SYMBOL(xfrm_dev_state_flush); 843 844 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 845 { 846 spin_lock_bh(&net->xfrm.xfrm_state_lock); 847 si->sadcnt = net->xfrm.state_num; 848 si->sadhcnt = net->xfrm.state_hmask + 1; 849 si->sadhmcnt = xfrm_state_hashmax; 850 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 851 } 852 EXPORT_SYMBOL(xfrm_sad_getinfo); 853 854 static void 855 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 856 { 857 const struct flowi4 *fl4 = &fl->u.ip4; 858 859 sel->daddr.a4 = fl4->daddr; 860 sel->saddr.a4 = fl4->saddr; 861 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 862 sel->dport_mask = htons(0xffff); 863 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 864 sel->sport_mask = htons(0xffff); 865 sel->family = AF_INET; 866 sel->prefixlen_d = 32; 867 sel->prefixlen_s = 32; 868 sel->proto = fl4->flowi4_proto; 869 sel->ifindex = fl4->flowi4_oif; 870 } 871 872 static void 873 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 874 { 875 const struct flowi6 *fl6 = &fl->u.ip6; 876 877 /* Initialize temporary selector matching only to current session. */ 878 *(struct in6_addr *)&sel->daddr = fl6->daddr; 879 *(struct in6_addr *)&sel->saddr = fl6->saddr; 880 sel->dport = xfrm_flowi_dport(fl, &fl6->uli); 881 sel->dport_mask = htons(0xffff); 882 sel->sport = xfrm_flowi_sport(fl, &fl6->uli); 883 sel->sport_mask = htons(0xffff); 884 sel->family = AF_INET6; 885 sel->prefixlen_d = 128; 886 sel->prefixlen_s = 128; 887 sel->proto = fl6->flowi6_proto; 888 sel->ifindex = fl6->flowi6_oif; 889 } 890 891 static void 892 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 893 const struct xfrm_tmpl *tmpl, 894 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 895 unsigned short family) 896 { 897 switch (family) { 898 case AF_INET: 899 __xfrm4_init_tempsel(&x->sel, fl); 900 break; 901 case AF_INET6: 902 __xfrm6_init_tempsel(&x->sel, fl); 903 break; 904 } 905 906 x->id = tmpl->id; 907 908 switch (tmpl->encap_family) { 909 case AF_INET: 910 if (x->id.daddr.a4 == 0) 911 x->id.daddr.a4 = daddr->a4; 912 x->props.saddr = tmpl->saddr; 913 if (x->props.saddr.a4 == 0) 914 x->props.saddr.a4 = saddr->a4; 915 break; 916 case AF_INET6: 917 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) 918 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 919 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 920 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) 921 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 922 break; 923 } 924 925 x->props.mode = tmpl->mode; 926 x->props.reqid = tmpl->reqid; 927 x->props.family = tmpl->encap_family; 928 } 929 930 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 931 const xfrm_address_t *daddr, 932 __be32 spi, u8 proto, 933 unsigned short family) 934 { 935 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 936 struct xfrm_state *x; 937 938 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { 939 if (x->props.family != family || 940 x->id.spi != spi || 941 x->id.proto != proto || 942 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 943 continue; 944 945 if ((mark & x->mark.m) != x->mark.v) 946 continue; 947 if (!xfrm_state_hold_rcu(x)) 948 continue; 949 return x; 950 } 951 952 return NULL; 953 } 954 955 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 956 const xfrm_address_t *daddr, 957 const xfrm_address_t *saddr, 958 u8 proto, unsigned short family) 959 { 960 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 961 struct xfrm_state *x; 962 963 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { 964 if (x->props.family != family || 965 x->id.proto != proto || 966 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 967 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 968 continue; 969 970 if ((mark & x->mark.m) != x->mark.v) 971 continue; 972 if (!xfrm_state_hold_rcu(x)) 973 continue; 974 return x; 975 } 976 977 return NULL; 978 } 979 980 static inline struct xfrm_state * 981 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 982 { 983 struct net *net = xs_net(x); 984 u32 mark = x->mark.v & x->mark.m; 985 986 if (use_spi) 987 return __xfrm_state_lookup(net, mark, &x->id.daddr, 988 x->id.spi, x->id.proto, family); 989 else 990 return __xfrm_state_lookup_byaddr(net, mark, 991 &x->id.daddr, 992 &x->props.saddr, 993 x->id.proto, family); 994 } 995 996 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 997 { 998 if (have_hash_collision && 999 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 1000 net->xfrm.state_num > net->xfrm.state_hmask) 1001 schedule_work(&net->xfrm.state_hash_work); 1002 } 1003 1004 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 1005 const struct flowi *fl, unsigned short family, 1006 struct xfrm_state **best, int *acq_in_progress, 1007 int *error) 1008 { 1009 /* Resolution logic: 1010 * 1. There is a valid state with matching selector. Done. 1011 * 2. Valid state with inappropriate selector. Skip. 1012 * 1013 * Entering area of "sysdeps". 1014 * 1015 * 3. If state is not valid, selector is temporary, it selects 1016 * only session which triggered previous resolution. Key 1017 * manager will do something to install a state with proper 1018 * selector. 1019 */ 1020 if (x->km.state == XFRM_STATE_VALID) { 1021 if ((x->sel.family && 1022 (x->sel.family != family || 1023 !xfrm_selector_match(&x->sel, fl, family))) || 1024 !security_xfrm_state_pol_flow_match(x, pol, 1025 &fl->u.__fl_common)) 1026 return; 1027 1028 if (!*best || 1029 (*best)->km.dying > x->km.dying || 1030 ((*best)->km.dying == x->km.dying && 1031 (*best)->curlft.add_time < x->curlft.add_time)) 1032 *best = x; 1033 } else if (x->km.state == XFRM_STATE_ACQ) { 1034 *acq_in_progress = 1; 1035 } else if (x->km.state == XFRM_STATE_ERROR || 1036 x->km.state == XFRM_STATE_EXPIRED) { 1037 if ((!x->sel.family || 1038 (x->sel.family == family && 1039 xfrm_selector_match(&x->sel, fl, family))) && 1040 security_xfrm_state_pol_flow_match(x, pol, 1041 &fl->u.__fl_common)) 1042 *error = -ESRCH; 1043 } 1044 } 1045 1046 struct xfrm_state * 1047 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1048 const struct flowi *fl, struct xfrm_tmpl *tmpl, 1049 struct xfrm_policy *pol, int *err, 1050 unsigned short family, u32 if_id) 1051 { 1052 static xfrm_address_t saddr_wildcard = { }; 1053 struct net *net = xp_net(pol); 1054 unsigned int h, h_wildcard; 1055 struct xfrm_state *x, *x0, *to_put; 1056 int acquire_in_progress = 0; 1057 int error = 0; 1058 struct xfrm_state *best = NULL; 1059 u32 mark = pol->mark.v & pol->mark.m; 1060 unsigned short encap_family = tmpl->encap_family; 1061 unsigned int sequence; 1062 struct km_event c; 1063 1064 to_put = NULL; 1065 1066 sequence = read_seqcount_begin(&xfrm_state_hash_generation); 1067 1068 rcu_read_lock(); 1069 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 1070 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { 1071 if (x->props.family == encap_family && 1072 x->props.reqid == tmpl->reqid && 1073 (mark & x->mark.m) == x->mark.v && 1074 x->if_id == if_id && 1075 !(x->props.flags & XFRM_STATE_WILDRECV) && 1076 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1077 tmpl->mode == x->props.mode && 1078 tmpl->id.proto == x->id.proto && 1079 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1080 xfrm_state_look_at(pol, x, fl, family, 1081 &best, &acquire_in_progress, &error); 1082 } 1083 if (best || acquire_in_progress) 1084 goto found; 1085 1086 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 1087 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { 1088 if (x->props.family == encap_family && 1089 x->props.reqid == tmpl->reqid && 1090 (mark & x->mark.m) == x->mark.v && 1091 x->if_id == if_id && 1092 !(x->props.flags & XFRM_STATE_WILDRECV) && 1093 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1094 tmpl->mode == x->props.mode && 1095 tmpl->id.proto == x->id.proto && 1096 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1097 xfrm_state_look_at(pol, x, fl, family, 1098 &best, &acquire_in_progress, &error); 1099 } 1100 1101 found: 1102 x = best; 1103 if (!x && !error && !acquire_in_progress) { 1104 if (tmpl->id.spi && 1105 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 1106 tmpl->id.proto, encap_family)) != NULL) { 1107 to_put = x0; 1108 error = -EEXIST; 1109 goto out; 1110 } 1111 1112 c.net = net; 1113 /* If the KMs have no listeners (yet...), avoid allocating an SA 1114 * for each and every packet - garbage collection might not 1115 * handle the flood. 1116 */ 1117 if (!km_is_alive(&c)) { 1118 error = -ESRCH; 1119 goto out; 1120 } 1121 1122 x = xfrm_state_alloc(net); 1123 if (x == NULL) { 1124 error = -ENOMEM; 1125 goto out; 1126 } 1127 /* Initialize temporary state matching only 1128 * to current session. */ 1129 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1130 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1131 x->if_id = if_id; 1132 1133 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1134 if (error) { 1135 x->km.state = XFRM_STATE_DEAD; 1136 to_put = x; 1137 x = NULL; 1138 goto out; 1139 } 1140 1141 if (km_query(x, tmpl, pol) == 0) { 1142 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1143 x->km.state = XFRM_STATE_ACQ; 1144 list_add(&x->km.all, &net->xfrm.state_all); 1145 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1146 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1147 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1148 if (x->id.spi) { 1149 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1150 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1151 } 1152 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1153 hrtimer_start(&x->mtimer, 1154 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1155 HRTIMER_MODE_REL_SOFT); 1156 net->xfrm.state_num++; 1157 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1158 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1159 } else { 1160 x->km.state = XFRM_STATE_DEAD; 1161 to_put = x; 1162 x = NULL; 1163 error = -ESRCH; 1164 } 1165 } 1166 out: 1167 if (x) { 1168 if (!xfrm_state_hold_rcu(x)) { 1169 *err = -EAGAIN; 1170 x = NULL; 1171 } 1172 } else { 1173 *err = acquire_in_progress ? -EAGAIN : error; 1174 } 1175 rcu_read_unlock(); 1176 if (to_put) 1177 xfrm_state_put(to_put); 1178 1179 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { 1180 *err = -EAGAIN; 1181 if (x) { 1182 xfrm_state_put(x); 1183 x = NULL; 1184 } 1185 } 1186 1187 return x; 1188 } 1189 1190 struct xfrm_state * 1191 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1192 xfrm_address_t *daddr, xfrm_address_t *saddr, 1193 unsigned short family, u8 mode, u8 proto, u32 reqid) 1194 { 1195 unsigned int h; 1196 struct xfrm_state *rx = NULL, *x = NULL; 1197 1198 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1199 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1200 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1201 if (x->props.family == family && 1202 x->props.reqid == reqid && 1203 (mark & x->mark.m) == x->mark.v && 1204 x->if_id == if_id && 1205 !(x->props.flags & XFRM_STATE_WILDRECV) && 1206 xfrm_state_addr_check(x, daddr, saddr, family) && 1207 mode == x->props.mode && 1208 proto == x->id.proto && 1209 x->km.state == XFRM_STATE_VALID) { 1210 rx = x; 1211 break; 1212 } 1213 } 1214 1215 if (rx) 1216 xfrm_state_hold(rx); 1217 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1218 1219 1220 return rx; 1221 } 1222 EXPORT_SYMBOL(xfrm_stateonly_find); 1223 1224 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1225 unsigned short family) 1226 { 1227 struct xfrm_state *x; 1228 struct xfrm_state_walk *w; 1229 1230 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1231 list_for_each_entry(w, &net->xfrm.state_all, all) { 1232 x = container_of(w, struct xfrm_state, km); 1233 if (x->props.family != family || 1234 x->id.spi != spi) 1235 continue; 1236 1237 xfrm_state_hold(x); 1238 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1239 return x; 1240 } 1241 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1242 return NULL; 1243 } 1244 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1245 1246 static void __xfrm_state_insert(struct xfrm_state *x) 1247 { 1248 struct net *net = xs_net(x); 1249 unsigned int h; 1250 1251 list_add(&x->km.all, &net->xfrm.state_all); 1252 1253 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1254 x->props.reqid, x->props.family); 1255 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1256 1257 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1258 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1259 1260 if (x->id.spi) { 1261 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1262 x->props.family); 1263 1264 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1265 } 1266 1267 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); 1268 if (x->replay_maxage) 1269 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1270 1271 net->xfrm.state_num++; 1272 1273 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1274 } 1275 1276 /* net->xfrm.xfrm_state_lock is held */ 1277 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1278 { 1279 struct net *net = xs_net(xnew); 1280 unsigned short family = xnew->props.family; 1281 u32 reqid = xnew->props.reqid; 1282 struct xfrm_state *x; 1283 unsigned int h; 1284 u32 mark = xnew->mark.v & xnew->mark.m; 1285 u32 if_id = xnew->if_id; 1286 1287 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1288 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1289 if (x->props.family == family && 1290 x->props.reqid == reqid && 1291 x->if_id == if_id && 1292 (mark & x->mark.m) == x->mark.v && 1293 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1294 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1295 x->genid++; 1296 } 1297 } 1298 1299 void xfrm_state_insert(struct xfrm_state *x) 1300 { 1301 struct net *net = xs_net(x); 1302 1303 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1304 __xfrm_state_bump_genids(x); 1305 __xfrm_state_insert(x); 1306 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1307 } 1308 EXPORT_SYMBOL(xfrm_state_insert); 1309 1310 /* net->xfrm.xfrm_state_lock is held */ 1311 static struct xfrm_state *__find_acq_core(struct net *net, 1312 const struct xfrm_mark *m, 1313 unsigned short family, u8 mode, 1314 u32 reqid, u32 if_id, u8 proto, 1315 const xfrm_address_t *daddr, 1316 const xfrm_address_t *saddr, 1317 int create) 1318 { 1319 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1320 struct xfrm_state *x; 1321 u32 mark = m->v & m->m; 1322 1323 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1324 if (x->props.reqid != reqid || 1325 x->props.mode != mode || 1326 x->props.family != family || 1327 x->km.state != XFRM_STATE_ACQ || 1328 x->id.spi != 0 || 1329 x->id.proto != proto || 1330 (mark & x->mark.m) != x->mark.v || 1331 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1332 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1333 continue; 1334 1335 xfrm_state_hold(x); 1336 return x; 1337 } 1338 1339 if (!create) 1340 return NULL; 1341 1342 x = xfrm_state_alloc(net); 1343 if (likely(x)) { 1344 switch (family) { 1345 case AF_INET: 1346 x->sel.daddr.a4 = daddr->a4; 1347 x->sel.saddr.a4 = saddr->a4; 1348 x->sel.prefixlen_d = 32; 1349 x->sel.prefixlen_s = 32; 1350 x->props.saddr.a4 = saddr->a4; 1351 x->id.daddr.a4 = daddr->a4; 1352 break; 1353 1354 case AF_INET6: 1355 x->sel.daddr.in6 = daddr->in6; 1356 x->sel.saddr.in6 = saddr->in6; 1357 x->sel.prefixlen_d = 128; 1358 x->sel.prefixlen_s = 128; 1359 x->props.saddr.in6 = saddr->in6; 1360 x->id.daddr.in6 = daddr->in6; 1361 break; 1362 } 1363 1364 x->km.state = XFRM_STATE_ACQ; 1365 x->id.proto = proto; 1366 x->props.family = family; 1367 x->props.mode = mode; 1368 x->props.reqid = reqid; 1369 x->if_id = if_id; 1370 x->mark.v = m->v; 1371 x->mark.m = m->m; 1372 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1373 xfrm_state_hold(x); 1374 hrtimer_start(&x->mtimer, 1375 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1376 HRTIMER_MODE_REL_SOFT); 1377 list_add(&x->km.all, &net->xfrm.state_all); 1378 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1379 h = xfrm_src_hash(net, daddr, saddr, family); 1380 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1381 1382 net->xfrm.state_num++; 1383 1384 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1385 } 1386 1387 return x; 1388 } 1389 1390 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1391 1392 int xfrm_state_add(struct xfrm_state *x) 1393 { 1394 struct net *net = xs_net(x); 1395 struct xfrm_state *x1, *to_put; 1396 int family; 1397 int err; 1398 u32 mark = x->mark.v & x->mark.m; 1399 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1400 1401 family = x->props.family; 1402 1403 to_put = NULL; 1404 1405 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1406 1407 x1 = __xfrm_state_locate(x, use_spi, family); 1408 if (x1) { 1409 to_put = x1; 1410 x1 = NULL; 1411 err = -EEXIST; 1412 goto out; 1413 } 1414 1415 if (use_spi && x->km.seq) { 1416 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1417 if (x1 && ((x1->id.proto != x->id.proto) || 1418 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1419 to_put = x1; 1420 x1 = NULL; 1421 } 1422 } 1423 1424 if (use_spi && !x1) 1425 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1426 x->props.reqid, x->if_id, x->id.proto, 1427 &x->id.daddr, &x->props.saddr, 0); 1428 1429 __xfrm_state_bump_genids(x); 1430 __xfrm_state_insert(x); 1431 err = 0; 1432 1433 out: 1434 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1435 1436 if (x1) { 1437 xfrm_state_delete(x1); 1438 xfrm_state_put(x1); 1439 } 1440 1441 if (to_put) 1442 xfrm_state_put(to_put); 1443 1444 return err; 1445 } 1446 EXPORT_SYMBOL(xfrm_state_add); 1447 1448 #ifdef CONFIG_XFRM_MIGRATE 1449 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security) 1450 { 1451 struct xfrm_user_sec_ctx *uctx; 1452 int size = sizeof(*uctx) + security->ctx_len; 1453 int err; 1454 1455 uctx = kmalloc(size, GFP_KERNEL); 1456 if (!uctx) 1457 return -ENOMEM; 1458 1459 uctx->exttype = XFRMA_SEC_CTX; 1460 uctx->len = size; 1461 uctx->ctx_doi = security->ctx_doi; 1462 uctx->ctx_alg = security->ctx_alg; 1463 uctx->ctx_len = security->ctx_len; 1464 memcpy(uctx + 1, security->ctx_str, security->ctx_len); 1465 err = security_xfrm_state_alloc(x, uctx); 1466 kfree(uctx); 1467 if (err) 1468 return err; 1469 1470 return 0; 1471 } 1472 1473 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1474 struct xfrm_encap_tmpl *encap) 1475 { 1476 struct net *net = xs_net(orig); 1477 struct xfrm_state *x = xfrm_state_alloc(net); 1478 if (!x) 1479 goto out; 1480 1481 memcpy(&x->id, &orig->id, sizeof(x->id)); 1482 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1483 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1484 x->props.mode = orig->props.mode; 1485 x->props.replay_window = orig->props.replay_window; 1486 x->props.reqid = orig->props.reqid; 1487 x->props.family = orig->props.family; 1488 x->props.saddr = orig->props.saddr; 1489 1490 if (orig->aalg) { 1491 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1492 if (!x->aalg) 1493 goto error; 1494 } 1495 x->props.aalgo = orig->props.aalgo; 1496 1497 if (orig->aead) { 1498 x->aead = xfrm_algo_aead_clone(orig->aead); 1499 x->geniv = orig->geniv; 1500 if (!x->aead) 1501 goto error; 1502 } 1503 if (orig->ealg) { 1504 x->ealg = xfrm_algo_clone(orig->ealg); 1505 if (!x->ealg) 1506 goto error; 1507 } 1508 x->props.ealgo = orig->props.ealgo; 1509 1510 if (orig->calg) { 1511 x->calg = xfrm_algo_clone(orig->calg); 1512 if (!x->calg) 1513 goto error; 1514 } 1515 x->props.calgo = orig->props.calgo; 1516 1517 if (encap || orig->encap) { 1518 if (encap) 1519 x->encap = kmemdup(encap, sizeof(*x->encap), 1520 GFP_KERNEL); 1521 else 1522 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1523 GFP_KERNEL); 1524 1525 if (!x->encap) 1526 goto error; 1527 } 1528 1529 if (orig->security) 1530 if (clone_security(x, orig->security)) 1531 goto error; 1532 1533 if (orig->coaddr) { 1534 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1535 GFP_KERNEL); 1536 if (!x->coaddr) 1537 goto error; 1538 } 1539 1540 if (orig->replay_esn) { 1541 if (xfrm_replay_clone(x, orig)) 1542 goto error; 1543 } 1544 1545 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1546 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark)); 1547 1548 if (xfrm_init_state(x) < 0) 1549 goto error; 1550 1551 x->props.flags = orig->props.flags; 1552 x->props.extra_flags = orig->props.extra_flags; 1553 1554 x->if_id = orig->if_id; 1555 x->tfcpad = orig->tfcpad; 1556 x->replay_maxdiff = orig->replay_maxdiff; 1557 x->replay_maxage = orig->replay_maxage; 1558 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft)); 1559 x->km.state = orig->km.state; 1560 x->km.seq = orig->km.seq; 1561 x->replay = orig->replay; 1562 x->preplay = orig->preplay; 1563 1564 return x; 1565 1566 error: 1567 xfrm_state_put(x); 1568 out: 1569 return NULL; 1570 } 1571 1572 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1573 { 1574 unsigned int h; 1575 struct xfrm_state *x = NULL; 1576 1577 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1578 1579 if (m->reqid) { 1580 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1581 m->reqid, m->old_family); 1582 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1583 if (x->props.mode != m->mode || 1584 x->id.proto != m->proto) 1585 continue; 1586 if (m->reqid && x->props.reqid != m->reqid) 1587 continue; 1588 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1589 m->old_family) || 1590 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1591 m->old_family)) 1592 continue; 1593 xfrm_state_hold(x); 1594 break; 1595 } 1596 } else { 1597 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1598 m->old_family); 1599 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1600 if (x->props.mode != m->mode || 1601 x->id.proto != m->proto) 1602 continue; 1603 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1604 m->old_family) || 1605 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1606 m->old_family)) 1607 continue; 1608 xfrm_state_hold(x); 1609 break; 1610 } 1611 } 1612 1613 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1614 1615 return x; 1616 } 1617 EXPORT_SYMBOL(xfrm_migrate_state_find); 1618 1619 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1620 struct xfrm_migrate *m, 1621 struct xfrm_encap_tmpl *encap) 1622 { 1623 struct xfrm_state *xc; 1624 1625 xc = xfrm_state_clone(x, encap); 1626 if (!xc) 1627 return NULL; 1628 1629 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1630 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1631 1632 /* add state */ 1633 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1634 /* a care is needed when the destination address of the 1635 state is to be updated as it is a part of triplet */ 1636 xfrm_state_insert(xc); 1637 } else { 1638 if (xfrm_state_add(xc) < 0) 1639 goto error; 1640 } 1641 1642 return xc; 1643 error: 1644 xfrm_state_put(xc); 1645 return NULL; 1646 } 1647 EXPORT_SYMBOL(xfrm_state_migrate); 1648 #endif 1649 1650 int xfrm_state_update(struct xfrm_state *x) 1651 { 1652 struct xfrm_state *x1, *to_put; 1653 int err; 1654 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1655 struct net *net = xs_net(x); 1656 1657 to_put = NULL; 1658 1659 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1660 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1661 1662 err = -ESRCH; 1663 if (!x1) 1664 goto out; 1665 1666 if (xfrm_state_kern(x1)) { 1667 to_put = x1; 1668 err = -EEXIST; 1669 goto out; 1670 } 1671 1672 if (x1->km.state == XFRM_STATE_ACQ) { 1673 __xfrm_state_insert(x); 1674 x = NULL; 1675 } 1676 err = 0; 1677 1678 out: 1679 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1680 1681 if (to_put) 1682 xfrm_state_put(to_put); 1683 1684 if (err) 1685 return err; 1686 1687 if (!x) { 1688 xfrm_state_delete(x1); 1689 xfrm_state_put(x1); 1690 return 0; 1691 } 1692 1693 err = -EINVAL; 1694 spin_lock_bh(&x1->lock); 1695 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1696 if (x->encap && x1->encap && 1697 x->encap->encap_type == x1->encap->encap_type) 1698 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1699 else if (x->encap || x1->encap) 1700 goto fail; 1701 1702 if (x->coaddr && x1->coaddr) { 1703 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1704 } 1705 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1706 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1707 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1708 x1->km.dying = 0; 1709 1710 hrtimer_start(&x1->mtimer, ktime_set(1, 0), 1711 HRTIMER_MODE_REL_SOFT); 1712 if (x1->curlft.use_time) 1713 xfrm_state_check_expire(x1); 1714 1715 if (x->props.smark.m || x->props.smark.v || x->if_id) { 1716 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1717 1718 if (x->props.smark.m || x->props.smark.v) 1719 x1->props.smark = x->props.smark; 1720 1721 if (x->if_id) 1722 x1->if_id = x->if_id; 1723 1724 __xfrm_state_bump_genids(x1); 1725 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1726 } 1727 1728 err = 0; 1729 x->km.state = XFRM_STATE_DEAD; 1730 __xfrm_state_put(x); 1731 } 1732 1733 fail: 1734 spin_unlock_bh(&x1->lock); 1735 1736 xfrm_state_put(x1); 1737 1738 return err; 1739 } 1740 EXPORT_SYMBOL(xfrm_state_update); 1741 1742 int xfrm_state_check_expire(struct xfrm_state *x) 1743 { 1744 if (!x->curlft.use_time) 1745 x->curlft.use_time = ktime_get_real_seconds(); 1746 1747 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1748 x->curlft.packets >= x->lft.hard_packet_limit) { 1749 x->km.state = XFRM_STATE_EXPIRED; 1750 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); 1751 return -EINVAL; 1752 } 1753 1754 if (!x->km.dying && 1755 (x->curlft.bytes >= x->lft.soft_byte_limit || 1756 x->curlft.packets >= x->lft.soft_packet_limit)) { 1757 x->km.dying = 1; 1758 km_state_expired(x, 0, 0); 1759 } 1760 return 0; 1761 } 1762 EXPORT_SYMBOL(xfrm_state_check_expire); 1763 1764 struct xfrm_state * 1765 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1766 u8 proto, unsigned short family) 1767 { 1768 struct xfrm_state *x; 1769 1770 rcu_read_lock(); 1771 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1772 rcu_read_unlock(); 1773 return x; 1774 } 1775 EXPORT_SYMBOL(xfrm_state_lookup); 1776 1777 struct xfrm_state * 1778 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1779 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1780 u8 proto, unsigned short family) 1781 { 1782 struct xfrm_state *x; 1783 1784 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1785 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1786 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1787 return x; 1788 } 1789 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1790 1791 struct xfrm_state * 1792 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1793 u32 if_id, u8 proto, const xfrm_address_t *daddr, 1794 const xfrm_address_t *saddr, int create, unsigned short family) 1795 { 1796 struct xfrm_state *x; 1797 1798 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1799 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create); 1800 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1801 1802 return x; 1803 } 1804 EXPORT_SYMBOL(xfrm_find_acq); 1805 1806 #ifdef CONFIG_XFRM_SUB_POLICY 1807 #if IS_ENABLED(CONFIG_IPV6) 1808 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 1809 static void 1810 __xfrm6_sort(void **dst, void **src, int n, 1811 int (*cmp)(const void *p), int maxclass) 1812 { 1813 int count[XFRM_MAX_DEPTH] = { }; 1814 int class[XFRM_MAX_DEPTH]; 1815 int i; 1816 1817 for (i = 0; i < n; i++) { 1818 int c = cmp(src[i]); 1819 1820 class[i] = c; 1821 count[c]++; 1822 } 1823 1824 for (i = 2; i < maxclass; i++) 1825 count[i] += count[i - 1]; 1826 1827 for (i = 0; i < n; i++) { 1828 dst[count[class[i] - 1]++] = src[i]; 1829 src[i] = NULL; 1830 } 1831 } 1832 1833 /* Rule for xfrm_state: 1834 * 1835 * rule 1: select IPsec transport except AH 1836 * rule 2: select MIPv6 RO or inbound trigger 1837 * rule 3: select IPsec transport AH 1838 * rule 4: select IPsec tunnel 1839 * rule 5: others 1840 */ 1841 static int __xfrm6_state_sort_cmp(const void *p) 1842 { 1843 const struct xfrm_state *v = p; 1844 1845 switch (v->props.mode) { 1846 case XFRM_MODE_TRANSPORT: 1847 if (v->id.proto != IPPROTO_AH) 1848 return 1; 1849 else 1850 return 3; 1851 #if IS_ENABLED(CONFIG_IPV6_MIP6) 1852 case XFRM_MODE_ROUTEOPTIMIZATION: 1853 case XFRM_MODE_IN_TRIGGER: 1854 return 2; 1855 #endif 1856 case XFRM_MODE_TUNNEL: 1857 case XFRM_MODE_BEET: 1858 return 4; 1859 } 1860 return 5; 1861 } 1862 1863 /* Rule for xfrm_tmpl: 1864 * 1865 * rule 1: select IPsec transport 1866 * rule 2: select MIPv6 RO or inbound trigger 1867 * rule 3: select IPsec tunnel 1868 * rule 4: others 1869 */ 1870 static int __xfrm6_tmpl_sort_cmp(const void *p) 1871 { 1872 const struct xfrm_tmpl *v = p; 1873 1874 switch (v->mode) { 1875 case XFRM_MODE_TRANSPORT: 1876 return 1; 1877 #if IS_ENABLED(CONFIG_IPV6_MIP6) 1878 case XFRM_MODE_ROUTEOPTIMIZATION: 1879 case XFRM_MODE_IN_TRIGGER: 1880 return 2; 1881 #endif 1882 case XFRM_MODE_TUNNEL: 1883 case XFRM_MODE_BEET: 1884 return 3; 1885 } 1886 return 4; 1887 } 1888 #else 1889 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } 1890 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } 1891 1892 static inline void 1893 __xfrm6_sort(void **dst, void **src, int n, 1894 int (*cmp)(const void *p), int maxclass) 1895 { 1896 int i; 1897 1898 for (i = 0; i < n; i++) 1899 dst[i] = src[i]; 1900 } 1901 #endif /* CONFIG_IPV6 */ 1902 1903 void 1904 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1905 unsigned short family) 1906 { 1907 int i; 1908 1909 if (family == AF_INET6) 1910 __xfrm6_sort((void **)dst, (void **)src, n, 1911 __xfrm6_tmpl_sort_cmp, 5); 1912 else 1913 for (i = 0; i < n; i++) 1914 dst[i] = src[i]; 1915 } 1916 1917 void 1918 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1919 unsigned short family) 1920 { 1921 int i; 1922 1923 if (family == AF_INET6) 1924 __xfrm6_sort((void **)dst, (void **)src, n, 1925 __xfrm6_state_sort_cmp, 6); 1926 else 1927 for (i = 0; i < n; i++) 1928 dst[i] = src[i]; 1929 } 1930 #endif 1931 1932 /* Silly enough, but I'm lazy to build resolution list */ 1933 1934 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1935 { 1936 int i; 1937 1938 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1939 struct xfrm_state *x; 1940 1941 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1942 if (x->km.seq == seq && 1943 (mark & x->mark.m) == x->mark.v && 1944 x->km.state == XFRM_STATE_ACQ) { 1945 xfrm_state_hold(x); 1946 return x; 1947 } 1948 } 1949 } 1950 return NULL; 1951 } 1952 1953 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1954 { 1955 struct xfrm_state *x; 1956 1957 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1958 x = __xfrm_find_acq_byseq(net, mark, seq); 1959 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1960 return x; 1961 } 1962 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1963 1964 u32 xfrm_get_acqseq(void) 1965 { 1966 u32 res; 1967 static atomic_t acqseq; 1968 1969 do { 1970 res = atomic_inc_return(&acqseq); 1971 } while (!res); 1972 1973 return res; 1974 } 1975 EXPORT_SYMBOL(xfrm_get_acqseq); 1976 1977 int verify_spi_info(u8 proto, u32 min, u32 max) 1978 { 1979 switch (proto) { 1980 case IPPROTO_AH: 1981 case IPPROTO_ESP: 1982 break; 1983 1984 case IPPROTO_COMP: 1985 /* IPCOMP spi is 16-bits. */ 1986 if (max >= 0x10000) 1987 return -EINVAL; 1988 break; 1989 1990 default: 1991 return -EINVAL; 1992 } 1993 1994 if (min > max) 1995 return -EINVAL; 1996 1997 return 0; 1998 } 1999 EXPORT_SYMBOL(verify_spi_info); 2000 2001 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 2002 { 2003 struct net *net = xs_net(x); 2004 unsigned int h; 2005 struct xfrm_state *x0; 2006 int err = -ENOENT; 2007 __be32 minspi = htonl(low); 2008 __be32 maxspi = htonl(high); 2009 __be32 newspi = 0; 2010 u32 mark = x->mark.v & x->mark.m; 2011 2012 spin_lock_bh(&x->lock); 2013 if (x->km.state == XFRM_STATE_DEAD) 2014 goto unlock; 2015 2016 err = 0; 2017 if (x->id.spi) 2018 goto unlock; 2019 2020 err = -ENOENT; 2021 2022 if (minspi == maxspi) { 2023 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 2024 if (x0) { 2025 xfrm_state_put(x0); 2026 goto unlock; 2027 } 2028 newspi = minspi; 2029 } else { 2030 u32 spi = 0; 2031 for (h = 0; h < high-low+1; h++) { 2032 spi = low + prandom_u32()%(high-low+1); 2033 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 2034 if (x0 == NULL) { 2035 newspi = htonl(spi); 2036 break; 2037 } 2038 xfrm_state_put(x0); 2039 } 2040 } 2041 if (newspi) { 2042 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2043 x->id.spi = newspi; 2044 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 2045 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 2046 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2047 2048 err = 0; 2049 } 2050 2051 unlock: 2052 spin_unlock_bh(&x->lock); 2053 2054 return err; 2055 } 2056 EXPORT_SYMBOL(xfrm_alloc_spi); 2057 2058 static bool __xfrm_state_filter_match(struct xfrm_state *x, 2059 struct xfrm_address_filter *filter) 2060 { 2061 if (filter) { 2062 if ((filter->family == AF_INET || 2063 filter->family == AF_INET6) && 2064 x->props.family != filter->family) 2065 return false; 2066 2067 return addr_match(&x->props.saddr, &filter->saddr, 2068 filter->splen) && 2069 addr_match(&x->id.daddr, &filter->daddr, 2070 filter->dplen); 2071 } 2072 return true; 2073 } 2074 2075 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 2076 int (*func)(struct xfrm_state *, int, void*), 2077 void *data) 2078 { 2079 struct xfrm_state *state; 2080 struct xfrm_state_walk *x; 2081 int err = 0; 2082 2083 if (walk->seq != 0 && list_empty(&walk->all)) 2084 return 0; 2085 2086 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2087 if (list_empty(&walk->all)) 2088 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 2089 else 2090 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 2091 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 2092 if (x->state == XFRM_STATE_DEAD) 2093 continue; 2094 state = container_of(x, struct xfrm_state, km); 2095 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 2096 continue; 2097 if (!__xfrm_state_filter_match(state, walk->filter)) 2098 continue; 2099 err = func(state, walk->seq, data); 2100 if (err) { 2101 list_move_tail(&walk->all, &x->all); 2102 goto out; 2103 } 2104 walk->seq++; 2105 } 2106 if (walk->seq == 0) { 2107 err = -ENOENT; 2108 goto out; 2109 } 2110 list_del_init(&walk->all); 2111 out: 2112 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2113 return err; 2114 } 2115 EXPORT_SYMBOL(xfrm_state_walk); 2116 2117 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 2118 struct xfrm_address_filter *filter) 2119 { 2120 INIT_LIST_HEAD(&walk->all); 2121 walk->proto = proto; 2122 walk->state = XFRM_STATE_DEAD; 2123 walk->seq = 0; 2124 walk->filter = filter; 2125 } 2126 EXPORT_SYMBOL(xfrm_state_walk_init); 2127 2128 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 2129 { 2130 kfree(walk->filter); 2131 2132 if (list_empty(&walk->all)) 2133 return; 2134 2135 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2136 list_del(&walk->all); 2137 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2138 } 2139 EXPORT_SYMBOL(xfrm_state_walk_done); 2140 2141 static void xfrm_replay_timer_handler(struct timer_list *t) 2142 { 2143 struct xfrm_state *x = from_timer(x, t, rtimer); 2144 2145 spin_lock(&x->lock); 2146 2147 if (x->km.state == XFRM_STATE_VALID) { 2148 if (xfrm_aevent_is_on(xs_net(x))) 2149 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 2150 else 2151 x->xflags |= XFRM_TIME_DEFER; 2152 } 2153 2154 spin_unlock(&x->lock); 2155 } 2156 2157 static LIST_HEAD(xfrm_km_list); 2158 2159 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2160 { 2161 struct xfrm_mgr *km; 2162 2163 rcu_read_lock(); 2164 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2165 if (km->notify_policy) 2166 km->notify_policy(xp, dir, c); 2167 rcu_read_unlock(); 2168 } 2169 2170 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 2171 { 2172 struct xfrm_mgr *km; 2173 rcu_read_lock(); 2174 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2175 if (km->notify) 2176 km->notify(x, c); 2177 rcu_read_unlock(); 2178 } 2179 2180 EXPORT_SYMBOL(km_policy_notify); 2181 EXPORT_SYMBOL(km_state_notify); 2182 2183 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 2184 { 2185 struct km_event c; 2186 2187 c.data.hard = hard; 2188 c.portid = portid; 2189 c.event = XFRM_MSG_EXPIRE; 2190 km_state_notify(x, &c); 2191 } 2192 2193 EXPORT_SYMBOL(km_state_expired); 2194 /* 2195 * We send to all registered managers regardless of failure 2196 * We are happy with one success 2197 */ 2198 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 2199 { 2200 int err = -EINVAL, acqret; 2201 struct xfrm_mgr *km; 2202 2203 rcu_read_lock(); 2204 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2205 acqret = km->acquire(x, t, pol); 2206 if (!acqret) 2207 err = acqret; 2208 } 2209 rcu_read_unlock(); 2210 return err; 2211 } 2212 EXPORT_SYMBOL(km_query); 2213 2214 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2215 { 2216 int err = -EINVAL; 2217 struct xfrm_mgr *km; 2218 2219 rcu_read_lock(); 2220 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2221 if (km->new_mapping) 2222 err = km->new_mapping(x, ipaddr, sport); 2223 if (!err) 2224 break; 2225 } 2226 rcu_read_unlock(); 2227 return err; 2228 } 2229 EXPORT_SYMBOL(km_new_mapping); 2230 2231 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2232 { 2233 struct km_event c; 2234 2235 c.data.hard = hard; 2236 c.portid = portid; 2237 c.event = XFRM_MSG_POLEXPIRE; 2238 km_policy_notify(pol, dir, &c); 2239 } 2240 EXPORT_SYMBOL(km_policy_expired); 2241 2242 #ifdef CONFIG_XFRM_MIGRATE 2243 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2244 const struct xfrm_migrate *m, int num_migrate, 2245 const struct xfrm_kmaddress *k, 2246 const struct xfrm_encap_tmpl *encap) 2247 { 2248 int err = -EINVAL; 2249 int ret; 2250 struct xfrm_mgr *km; 2251 2252 rcu_read_lock(); 2253 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2254 if (km->migrate) { 2255 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2256 encap); 2257 if (!ret) 2258 err = ret; 2259 } 2260 } 2261 rcu_read_unlock(); 2262 return err; 2263 } 2264 EXPORT_SYMBOL(km_migrate); 2265 #endif 2266 2267 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2268 { 2269 int err = -EINVAL; 2270 int ret; 2271 struct xfrm_mgr *km; 2272 2273 rcu_read_lock(); 2274 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2275 if (km->report) { 2276 ret = km->report(net, proto, sel, addr); 2277 if (!ret) 2278 err = ret; 2279 } 2280 } 2281 rcu_read_unlock(); 2282 return err; 2283 } 2284 EXPORT_SYMBOL(km_report); 2285 2286 static bool km_is_alive(const struct km_event *c) 2287 { 2288 struct xfrm_mgr *km; 2289 bool is_alive = false; 2290 2291 rcu_read_lock(); 2292 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2293 if (km->is_alive && km->is_alive(c)) { 2294 is_alive = true; 2295 break; 2296 } 2297 } 2298 rcu_read_unlock(); 2299 2300 return is_alive; 2301 } 2302 2303 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2304 static DEFINE_SPINLOCK(xfrm_translator_lock); 2305 static struct xfrm_translator __rcu *xfrm_translator; 2306 2307 struct xfrm_translator *xfrm_get_translator(void) 2308 { 2309 struct xfrm_translator *xtr; 2310 2311 rcu_read_lock(); 2312 xtr = rcu_dereference(xfrm_translator); 2313 if (unlikely(!xtr)) 2314 goto out; 2315 if (!try_module_get(xtr->owner)) 2316 xtr = NULL; 2317 out: 2318 rcu_read_unlock(); 2319 return xtr; 2320 } 2321 EXPORT_SYMBOL_GPL(xfrm_get_translator); 2322 2323 void xfrm_put_translator(struct xfrm_translator *xtr) 2324 { 2325 module_put(xtr->owner); 2326 } 2327 EXPORT_SYMBOL_GPL(xfrm_put_translator); 2328 2329 int xfrm_register_translator(struct xfrm_translator *xtr) 2330 { 2331 int err = 0; 2332 2333 spin_lock_bh(&xfrm_translator_lock); 2334 if (unlikely(xfrm_translator != NULL)) 2335 err = -EEXIST; 2336 else 2337 rcu_assign_pointer(xfrm_translator, xtr); 2338 spin_unlock_bh(&xfrm_translator_lock); 2339 2340 return err; 2341 } 2342 EXPORT_SYMBOL_GPL(xfrm_register_translator); 2343 2344 int xfrm_unregister_translator(struct xfrm_translator *xtr) 2345 { 2346 int err = 0; 2347 2348 spin_lock_bh(&xfrm_translator_lock); 2349 if (likely(xfrm_translator != NULL)) { 2350 if (rcu_access_pointer(xfrm_translator) != xtr) 2351 err = -EINVAL; 2352 else 2353 RCU_INIT_POINTER(xfrm_translator, NULL); 2354 } 2355 spin_unlock_bh(&xfrm_translator_lock); 2356 synchronize_rcu(); 2357 2358 return err; 2359 } 2360 EXPORT_SYMBOL_GPL(xfrm_unregister_translator); 2361 #endif 2362 2363 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen) 2364 { 2365 int err; 2366 u8 *data; 2367 struct xfrm_mgr *km; 2368 struct xfrm_policy *pol = NULL; 2369 2370 if (sockptr_is_null(optval) && !optlen) { 2371 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2372 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2373 __sk_dst_reset(sk); 2374 return 0; 2375 } 2376 2377 if (optlen <= 0 || optlen > PAGE_SIZE) 2378 return -EMSGSIZE; 2379 2380 data = memdup_sockptr(optval, optlen); 2381 if (IS_ERR(data)) 2382 return PTR_ERR(data); 2383 2384 if (in_compat_syscall()) { 2385 struct xfrm_translator *xtr = xfrm_get_translator(); 2386 2387 if (!xtr) { 2388 kfree(data); 2389 return -EOPNOTSUPP; 2390 } 2391 2392 err = xtr->xlate_user_policy_sockptr(&data, optlen); 2393 xfrm_put_translator(xtr); 2394 if (err) { 2395 kfree(data); 2396 return err; 2397 } 2398 } 2399 2400 err = -EINVAL; 2401 rcu_read_lock(); 2402 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2403 pol = km->compile_policy(sk, optname, data, 2404 optlen, &err); 2405 if (err >= 0) 2406 break; 2407 } 2408 rcu_read_unlock(); 2409 2410 if (err >= 0) { 2411 xfrm_sk_policy_insert(sk, err, pol); 2412 xfrm_pol_put(pol); 2413 __sk_dst_reset(sk); 2414 err = 0; 2415 } 2416 2417 kfree(data); 2418 return err; 2419 } 2420 EXPORT_SYMBOL(xfrm_user_policy); 2421 2422 static DEFINE_SPINLOCK(xfrm_km_lock); 2423 2424 int xfrm_register_km(struct xfrm_mgr *km) 2425 { 2426 spin_lock_bh(&xfrm_km_lock); 2427 list_add_tail_rcu(&km->list, &xfrm_km_list); 2428 spin_unlock_bh(&xfrm_km_lock); 2429 return 0; 2430 } 2431 EXPORT_SYMBOL(xfrm_register_km); 2432 2433 int xfrm_unregister_km(struct xfrm_mgr *km) 2434 { 2435 spin_lock_bh(&xfrm_km_lock); 2436 list_del_rcu(&km->list); 2437 spin_unlock_bh(&xfrm_km_lock); 2438 synchronize_rcu(); 2439 return 0; 2440 } 2441 EXPORT_SYMBOL(xfrm_unregister_km); 2442 2443 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 2444 { 2445 int err = 0; 2446 2447 if (WARN_ON(afinfo->family >= NPROTO)) 2448 return -EAFNOSUPPORT; 2449 2450 spin_lock_bh(&xfrm_state_afinfo_lock); 2451 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 2452 err = -EEXIST; 2453 else 2454 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 2455 spin_unlock_bh(&xfrm_state_afinfo_lock); 2456 return err; 2457 } 2458 EXPORT_SYMBOL(xfrm_state_register_afinfo); 2459 2460 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 2461 { 2462 int err = 0, family = afinfo->family; 2463 2464 if (WARN_ON(family >= NPROTO)) 2465 return -EAFNOSUPPORT; 2466 2467 spin_lock_bh(&xfrm_state_afinfo_lock); 2468 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 2469 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 2470 err = -EINVAL; 2471 else 2472 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 2473 } 2474 spin_unlock_bh(&xfrm_state_afinfo_lock); 2475 synchronize_rcu(); 2476 return err; 2477 } 2478 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 2479 2480 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 2481 { 2482 if (unlikely(family >= NPROTO)) 2483 return NULL; 2484 2485 return rcu_dereference(xfrm_state_afinfo[family]); 2486 } 2487 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); 2488 2489 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 2490 { 2491 struct xfrm_state_afinfo *afinfo; 2492 if (unlikely(family >= NPROTO)) 2493 return NULL; 2494 rcu_read_lock(); 2495 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 2496 if (unlikely(!afinfo)) 2497 rcu_read_unlock(); 2498 return afinfo; 2499 } 2500 2501 void xfrm_flush_gc(void) 2502 { 2503 flush_work(&xfrm_state_gc_work); 2504 } 2505 EXPORT_SYMBOL(xfrm_flush_gc); 2506 2507 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 2508 void xfrm_state_delete_tunnel(struct xfrm_state *x) 2509 { 2510 if (x->tunnel) { 2511 struct xfrm_state *t = x->tunnel; 2512 2513 if (atomic_read(&t->tunnel_users) == 2) 2514 xfrm_state_delete(t); 2515 atomic_dec(&t->tunnel_users); 2516 xfrm_state_put_sync(t); 2517 x->tunnel = NULL; 2518 } 2519 } 2520 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 2521 2522 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) 2523 { 2524 const struct xfrm_type *type = READ_ONCE(x->type); 2525 struct crypto_aead *aead; 2526 u32 blksize, net_adj = 0; 2527 2528 if (x->km.state != XFRM_STATE_VALID || 2529 !type || type->proto != IPPROTO_ESP) 2530 return mtu - x->props.header_len; 2531 2532 aead = x->data; 2533 blksize = ALIGN(crypto_aead_blocksize(aead), 4); 2534 2535 switch (x->props.mode) { 2536 case XFRM_MODE_TRANSPORT: 2537 case XFRM_MODE_BEET: 2538 if (x->props.family == AF_INET) 2539 net_adj = sizeof(struct iphdr); 2540 else if (x->props.family == AF_INET6) 2541 net_adj = sizeof(struct ipv6hdr); 2542 break; 2543 case XFRM_MODE_TUNNEL: 2544 break; 2545 default: 2546 WARN_ON_ONCE(1); 2547 break; 2548 } 2549 2550 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - 2551 net_adj) & ~(blksize - 1)) + net_adj - 2; 2552 } 2553 EXPORT_SYMBOL_GPL(xfrm_state_mtu); 2554 2555 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) 2556 { 2557 const struct xfrm_mode *inner_mode; 2558 const struct xfrm_mode *outer_mode; 2559 int family = x->props.family; 2560 int err; 2561 2562 if (family == AF_INET && 2563 xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc) 2564 x->props.flags |= XFRM_STATE_NOPMTUDISC; 2565 2566 err = -EPROTONOSUPPORT; 2567 2568 if (x->sel.family != AF_UNSPEC) { 2569 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 2570 if (inner_mode == NULL) 2571 goto error; 2572 2573 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 2574 family != x->sel.family) 2575 goto error; 2576 2577 x->inner_mode = *inner_mode; 2578 } else { 2579 const struct xfrm_mode *inner_mode_iaf; 2580 int iafamily = AF_INET; 2581 2582 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 2583 if (inner_mode == NULL) 2584 goto error; 2585 2586 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 2587 goto error; 2588 2589 x->inner_mode = *inner_mode; 2590 2591 if (x->props.family == AF_INET) 2592 iafamily = AF_INET6; 2593 2594 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2595 if (inner_mode_iaf) { 2596 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2597 x->inner_mode_iaf = *inner_mode_iaf; 2598 } 2599 } 2600 2601 x->type = xfrm_get_type(x->id.proto, family); 2602 if (x->type == NULL) 2603 goto error; 2604 2605 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); 2606 2607 err = x->type->init_state(x); 2608 if (err) 2609 goto error; 2610 2611 outer_mode = xfrm_get_mode(x->props.mode, family); 2612 if (!outer_mode) { 2613 err = -EPROTONOSUPPORT; 2614 goto error; 2615 } 2616 2617 x->outer_mode = *outer_mode; 2618 if (init_replay) { 2619 err = xfrm_init_replay(x); 2620 if (err) 2621 goto error; 2622 } 2623 2624 error: 2625 return err; 2626 } 2627 2628 EXPORT_SYMBOL(__xfrm_init_state); 2629 2630 int xfrm_init_state(struct xfrm_state *x) 2631 { 2632 int err; 2633 2634 err = __xfrm_init_state(x, true, false); 2635 if (!err) 2636 x->km.state = XFRM_STATE_VALID; 2637 2638 return err; 2639 } 2640 2641 EXPORT_SYMBOL(xfrm_init_state); 2642 2643 int __net_init xfrm_state_init(struct net *net) 2644 { 2645 unsigned int sz; 2646 2647 if (net_eq(net, &init_net)) 2648 xfrm_state_cache = KMEM_CACHE(xfrm_state, 2649 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 2650 2651 INIT_LIST_HEAD(&net->xfrm.state_all); 2652 2653 sz = sizeof(struct hlist_head) * 8; 2654 2655 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2656 if (!net->xfrm.state_bydst) 2657 goto out_bydst; 2658 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2659 if (!net->xfrm.state_bysrc) 2660 goto out_bysrc; 2661 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2662 if (!net->xfrm.state_byspi) 2663 goto out_byspi; 2664 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2665 2666 net->xfrm.state_num = 0; 2667 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2668 spin_lock_init(&net->xfrm.xfrm_state_lock); 2669 return 0; 2670 2671 out_byspi: 2672 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2673 out_bysrc: 2674 xfrm_hash_free(net->xfrm.state_bydst, sz); 2675 out_bydst: 2676 return -ENOMEM; 2677 } 2678 2679 void xfrm_state_fini(struct net *net) 2680 { 2681 unsigned int sz; 2682 2683 flush_work(&net->xfrm.state_hash_work); 2684 flush_work(&xfrm_state_gc_work); 2685 xfrm_state_flush(net, 0, false, true); 2686 2687 WARN_ON(!list_empty(&net->xfrm.state_all)); 2688 2689 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2690 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2691 xfrm_hash_free(net->xfrm.state_byspi, sz); 2692 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2693 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2694 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2695 xfrm_hash_free(net->xfrm.state_bydst, sz); 2696 } 2697 2698 #ifdef CONFIG_AUDITSYSCALL 2699 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2700 struct audit_buffer *audit_buf) 2701 { 2702 struct xfrm_sec_ctx *ctx = x->security; 2703 u32 spi = ntohl(x->id.spi); 2704 2705 if (ctx) 2706 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2707 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2708 2709 switch (x->props.family) { 2710 case AF_INET: 2711 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2712 &x->props.saddr.a4, &x->id.daddr.a4); 2713 break; 2714 case AF_INET6: 2715 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2716 x->props.saddr.a6, x->id.daddr.a6); 2717 break; 2718 } 2719 2720 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2721 } 2722 2723 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2724 struct audit_buffer *audit_buf) 2725 { 2726 const struct iphdr *iph4; 2727 const struct ipv6hdr *iph6; 2728 2729 switch (family) { 2730 case AF_INET: 2731 iph4 = ip_hdr(skb); 2732 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2733 &iph4->saddr, &iph4->daddr); 2734 break; 2735 case AF_INET6: 2736 iph6 = ipv6_hdr(skb); 2737 audit_log_format(audit_buf, 2738 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2739 &iph6->saddr, &iph6->daddr, 2740 iph6->flow_lbl[0] & 0x0f, 2741 iph6->flow_lbl[1], 2742 iph6->flow_lbl[2]); 2743 break; 2744 } 2745 } 2746 2747 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 2748 { 2749 struct audit_buffer *audit_buf; 2750 2751 audit_buf = xfrm_audit_start("SAD-add"); 2752 if (audit_buf == NULL) 2753 return; 2754 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2755 xfrm_audit_helper_sainfo(x, audit_buf); 2756 audit_log_format(audit_buf, " res=%u", result); 2757 audit_log_end(audit_buf); 2758 } 2759 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2760 2761 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 2762 { 2763 struct audit_buffer *audit_buf; 2764 2765 audit_buf = xfrm_audit_start("SAD-delete"); 2766 if (audit_buf == NULL) 2767 return; 2768 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2769 xfrm_audit_helper_sainfo(x, audit_buf); 2770 audit_log_format(audit_buf, " res=%u", result); 2771 audit_log_end(audit_buf); 2772 } 2773 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2774 2775 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2776 struct sk_buff *skb) 2777 { 2778 struct audit_buffer *audit_buf; 2779 u32 spi; 2780 2781 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2782 if (audit_buf == NULL) 2783 return; 2784 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2785 /* don't record the sequence number because it's inherent in this kind 2786 * of audit message */ 2787 spi = ntohl(x->id.spi); 2788 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2789 audit_log_end(audit_buf); 2790 } 2791 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2792 2793 void xfrm_audit_state_replay(struct xfrm_state *x, 2794 struct sk_buff *skb, __be32 net_seq) 2795 { 2796 struct audit_buffer *audit_buf; 2797 u32 spi; 2798 2799 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2800 if (audit_buf == NULL) 2801 return; 2802 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2803 spi = ntohl(x->id.spi); 2804 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2805 spi, spi, ntohl(net_seq)); 2806 audit_log_end(audit_buf); 2807 } 2808 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2809 2810 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2811 { 2812 struct audit_buffer *audit_buf; 2813 2814 audit_buf = xfrm_audit_start("SA-notfound"); 2815 if (audit_buf == NULL) 2816 return; 2817 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2818 audit_log_end(audit_buf); 2819 } 2820 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2821 2822 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2823 __be32 net_spi, __be32 net_seq) 2824 { 2825 struct audit_buffer *audit_buf; 2826 u32 spi; 2827 2828 audit_buf = xfrm_audit_start("SA-notfound"); 2829 if (audit_buf == NULL) 2830 return; 2831 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2832 spi = ntohl(net_spi); 2833 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2834 spi, spi, ntohl(net_seq)); 2835 audit_log_end(audit_buf); 2836 } 2837 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2838 2839 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2840 struct sk_buff *skb, u8 proto) 2841 { 2842 struct audit_buffer *audit_buf; 2843 __be32 net_spi; 2844 __be32 net_seq; 2845 2846 audit_buf = xfrm_audit_start("SA-icv-failure"); 2847 if (audit_buf == NULL) 2848 return; 2849 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2850 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2851 u32 spi = ntohl(net_spi); 2852 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2853 spi, spi, ntohl(net_seq)); 2854 } 2855 audit_log_end(audit_buf); 2856 } 2857 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2858 #endif /* CONFIG_AUDITSYSCALL */ 2859