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