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/compat.h> 18 #include <linux/workqueue.h> 19 #include <net/xfrm.h> 20 #include <linux/pfkeyv2.h> 21 #include <linux/ipsec.h> 22 #include <linux/module.h> 23 #include <linux/cache.h> 24 #include <linux/audit.h> 25 #include <linux/uaccess.h> 26 #include <linux/ktime.h> 27 #include <linux/slab.h> 28 #include <linux/interrupt.h> 29 #include <linux/kernel.h> 30 31 #include <crypto/aead.h> 32 33 #include "xfrm_hash.h" 34 35 #define xfrm_state_deref_prot(table, net) \ 36 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) 37 #define xfrm_state_deref_check(table, net) \ 38 rcu_dereference_check((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) 39 40 static void xfrm_state_gc_task(struct work_struct *work); 41 42 /* Each xfrm_state may be linked to two tables: 43 44 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) 45 2. Hash table by (daddr,family,reqid) to find what SAs exist for given 46 destination/tunnel endpoint. (output) 47 */ 48 49 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 50 static struct kmem_cache *xfrm_state_cache __ro_after_init; 51 52 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); 53 static HLIST_HEAD(xfrm_state_gc_list); 54 static HLIST_HEAD(xfrm_state_dev_gc_list); 55 56 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) 57 { 58 return refcount_inc_not_zero(&x->refcnt); 59 } 60 61 static inline unsigned int xfrm_dst_hash(struct net *net, 62 const xfrm_address_t *daddr, 63 const xfrm_address_t *saddr, 64 u32 reqid, 65 unsigned short family) 66 { 67 lockdep_assert_held(&net->xfrm.xfrm_state_lock); 68 69 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 70 } 71 72 static inline unsigned int xfrm_src_hash(struct net *net, 73 const xfrm_address_t *daddr, 74 const xfrm_address_t *saddr, 75 unsigned short family) 76 { 77 lockdep_assert_held(&net->xfrm.xfrm_state_lock); 78 79 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 80 } 81 82 static inline unsigned int 83 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 84 __be32 spi, u8 proto, unsigned short family) 85 { 86 lockdep_assert_held(&net->xfrm.xfrm_state_lock); 87 88 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 89 } 90 91 static unsigned int xfrm_seq_hash(struct net *net, u32 seq) 92 { 93 lockdep_assert_held(&net->xfrm.xfrm_state_lock); 94 95 return __xfrm_seq_hash(seq, net->xfrm.state_hmask); 96 } 97 98 #define XFRM_STATE_INSERT(by, _n, _h, _type) \ 99 { \ 100 struct xfrm_state *_x = NULL; \ 101 \ 102 if (_type != XFRM_DEV_OFFLOAD_PACKET) { \ 103 hlist_for_each_entry_rcu(_x, _h, by) { \ 104 if (_x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \ 105 continue; \ 106 break; \ 107 } \ 108 } \ 109 \ 110 if (!_x || _x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \ 111 /* SAD is empty or consist from HW SAs only */ \ 112 hlist_add_head_rcu(_n, _h); \ 113 else \ 114 hlist_add_before_rcu(_n, &_x->by); \ 115 } 116 117 static void xfrm_hash_transfer(struct hlist_head *list, 118 struct hlist_head *ndsttable, 119 struct hlist_head *nsrctable, 120 struct hlist_head *nspitable, 121 struct hlist_head *nseqtable, 122 unsigned int nhashmask) 123 { 124 struct hlist_node *tmp; 125 struct xfrm_state *x; 126 127 hlist_for_each_entry_safe(x, tmp, list, bydst) { 128 unsigned int h; 129 130 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 131 x->props.reqid, x->props.family, 132 nhashmask); 133 XFRM_STATE_INSERT(bydst, &x->bydst, ndsttable + h, x->xso.type); 134 135 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 136 x->props.family, 137 nhashmask); 138 XFRM_STATE_INSERT(bysrc, &x->bysrc, nsrctable + h, x->xso.type); 139 140 if (x->id.spi) { 141 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 142 x->id.proto, x->props.family, 143 nhashmask); 144 XFRM_STATE_INSERT(byspi, &x->byspi, nspitable + h, 145 x->xso.type); 146 } 147 148 if (x->km.seq) { 149 h = __xfrm_seq_hash(x->km.seq, nhashmask); 150 XFRM_STATE_INSERT(byseq, &x->byseq, nseqtable + h, 151 x->xso.type); 152 } 153 } 154 } 155 156 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 157 { 158 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 159 } 160 161 static void xfrm_hash_resize(struct work_struct *work) 162 { 163 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 164 struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq; 165 unsigned long nsize, osize; 166 unsigned int nhashmask, ohashmask; 167 int i; 168 169 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 170 ndst = xfrm_hash_alloc(nsize); 171 if (!ndst) 172 return; 173 nsrc = xfrm_hash_alloc(nsize); 174 if (!nsrc) { 175 xfrm_hash_free(ndst, nsize); 176 return; 177 } 178 nspi = xfrm_hash_alloc(nsize); 179 if (!nspi) { 180 xfrm_hash_free(ndst, nsize); 181 xfrm_hash_free(nsrc, nsize); 182 return; 183 } 184 nseq = xfrm_hash_alloc(nsize); 185 if (!nseq) { 186 xfrm_hash_free(ndst, nsize); 187 xfrm_hash_free(nsrc, nsize); 188 xfrm_hash_free(nspi, nsize); 189 return; 190 } 191 192 spin_lock_bh(&net->xfrm.xfrm_state_lock); 193 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 194 195 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 196 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); 197 for (i = net->xfrm.state_hmask; i >= 0; i--) 198 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask); 199 200 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); 201 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); 202 oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net); 203 ohashmask = net->xfrm.state_hmask; 204 205 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 206 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 207 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 208 rcu_assign_pointer(net->xfrm.state_byseq, nseq); 209 net->xfrm.state_hmask = nhashmask; 210 211 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation); 212 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 213 214 osize = (ohashmask + 1) * sizeof(struct hlist_head); 215 216 synchronize_rcu(); 217 218 xfrm_hash_free(odst, osize); 219 xfrm_hash_free(osrc, osize); 220 xfrm_hash_free(ospi, osize); 221 xfrm_hash_free(oseq, osize); 222 } 223 224 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 225 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 226 227 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 228 static DEFINE_SPINLOCK(xfrm_state_dev_gc_lock); 229 230 int __xfrm_state_delete(struct xfrm_state *x); 231 232 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 233 static bool km_is_alive(const struct km_event *c); 234 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 235 236 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 237 { 238 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 239 int err = 0; 240 241 if (!afinfo) 242 return -EAFNOSUPPORT; 243 244 #define X(afi, T, name) do { \ 245 WARN_ON((afi)->type_ ## name); \ 246 (afi)->type_ ## name = (T); \ 247 } while (0) 248 249 switch (type->proto) { 250 case IPPROTO_COMP: 251 X(afinfo, type, comp); 252 break; 253 case IPPROTO_AH: 254 X(afinfo, type, ah); 255 break; 256 case IPPROTO_ESP: 257 X(afinfo, type, esp); 258 break; 259 case IPPROTO_IPIP: 260 X(afinfo, type, ipip); 261 break; 262 case IPPROTO_DSTOPTS: 263 X(afinfo, type, dstopts); 264 break; 265 case IPPROTO_ROUTING: 266 X(afinfo, type, routing); 267 break; 268 case IPPROTO_IPV6: 269 X(afinfo, type, ipip6); 270 break; 271 default: 272 WARN_ON(1); 273 err = -EPROTONOSUPPORT; 274 break; 275 } 276 #undef X 277 rcu_read_unlock(); 278 return err; 279 } 280 EXPORT_SYMBOL(xfrm_register_type); 281 282 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 283 { 284 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 285 286 if (unlikely(afinfo == NULL)) 287 return; 288 289 #define X(afi, T, name) do { \ 290 WARN_ON((afi)->type_ ## name != (T)); \ 291 (afi)->type_ ## name = NULL; \ 292 } while (0) 293 294 switch (type->proto) { 295 case IPPROTO_COMP: 296 X(afinfo, type, comp); 297 break; 298 case IPPROTO_AH: 299 X(afinfo, type, ah); 300 break; 301 case IPPROTO_ESP: 302 X(afinfo, type, esp); 303 break; 304 case IPPROTO_IPIP: 305 X(afinfo, type, ipip); 306 break; 307 case IPPROTO_DSTOPTS: 308 X(afinfo, type, dstopts); 309 break; 310 case IPPROTO_ROUTING: 311 X(afinfo, type, routing); 312 break; 313 case IPPROTO_IPV6: 314 X(afinfo, type, ipip6); 315 break; 316 default: 317 WARN_ON(1); 318 break; 319 } 320 #undef X 321 rcu_read_unlock(); 322 } 323 EXPORT_SYMBOL(xfrm_unregister_type); 324 325 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 326 { 327 const struct xfrm_type *type = NULL; 328 struct xfrm_state_afinfo *afinfo; 329 int modload_attempted = 0; 330 331 retry: 332 afinfo = xfrm_state_get_afinfo(family); 333 if (unlikely(afinfo == NULL)) 334 return NULL; 335 336 switch (proto) { 337 case IPPROTO_COMP: 338 type = afinfo->type_comp; 339 break; 340 case IPPROTO_AH: 341 type = afinfo->type_ah; 342 break; 343 case IPPROTO_ESP: 344 type = afinfo->type_esp; 345 break; 346 case IPPROTO_IPIP: 347 type = afinfo->type_ipip; 348 break; 349 case IPPROTO_DSTOPTS: 350 type = afinfo->type_dstopts; 351 break; 352 case IPPROTO_ROUTING: 353 type = afinfo->type_routing; 354 break; 355 case IPPROTO_IPV6: 356 type = afinfo->type_ipip6; 357 break; 358 default: 359 break; 360 } 361 362 if (unlikely(type && !try_module_get(type->owner))) 363 type = NULL; 364 365 rcu_read_unlock(); 366 367 if (!type && !modload_attempted) { 368 request_module("xfrm-type-%d-%d", family, proto); 369 modload_attempted = 1; 370 goto retry; 371 } 372 373 return type; 374 } 375 376 static void xfrm_put_type(const struct xfrm_type *type) 377 { 378 module_put(type->owner); 379 } 380 381 int xfrm_register_type_offload(const struct xfrm_type_offload *type, 382 unsigned short family) 383 { 384 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 385 int err = 0; 386 387 if (unlikely(afinfo == NULL)) 388 return -EAFNOSUPPORT; 389 390 switch (type->proto) { 391 case IPPROTO_ESP: 392 WARN_ON(afinfo->type_offload_esp); 393 afinfo->type_offload_esp = type; 394 break; 395 default: 396 WARN_ON(1); 397 err = -EPROTONOSUPPORT; 398 break; 399 } 400 401 rcu_read_unlock(); 402 return err; 403 } 404 EXPORT_SYMBOL(xfrm_register_type_offload); 405 406 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, 407 unsigned short family) 408 { 409 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 410 411 if (unlikely(afinfo == NULL)) 412 return; 413 414 switch (type->proto) { 415 case IPPROTO_ESP: 416 WARN_ON(afinfo->type_offload_esp != type); 417 afinfo->type_offload_esp = NULL; 418 break; 419 default: 420 WARN_ON(1); 421 break; 422 } 423 rcu_read_unlock(); 424 } 425 EXPORT_SYMBOL(xfrm_unregister_type_offload); 426 427 void xfrm_set_type_offload(struct xfrm_state *x) 428 { 429 const struct xfrm_type_offload *type = NULL; 430 struct xfrm_state_afinfo *afinfo; 431 bool try_load = true; 432 433 retry: 434 afinfo = xfrm_state_get_afinfo(x->props.family); 435 if (unlikely(afinfo == NULL)) 436 goto out; 437 438 switch (x->id.proto) { 439 case IPPROTO_ESP: 440 type = afinfo->type_offload_esp; 441 break; 442 default: 443 break; 444 } 445 446 if ((type && !try_module_get(type->owner))) 447 type = NULL; 448 449 rcu_read_unlock(); 450 451 if (!type && try_load) { 452 request_module("xfrm-offload-%d-%d", x->props.family, 453 x->id.proto); 454 try_load = false; 455 goto retry; 456 } 457 458 out: 459 x->type_offload = type; 460 } 461 EXPORT_SYMBOL(xfrm_set_type_offload); 462 463 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = { 464 [XFRM_MODE_BEET] = { 465 .encap = XFRM_MODE_BEET, 466 .flags = XFRM_MODE_FLAG_TUNNEL, 467 .family = AF_INET, 468 }, 469 [XFRM_MODE_TRANSPORT] = { 470 .encap = XFRM_MODE_TRANSPORT, 471 .family = AF_INET, 472 }, 473 [XFRM_MODE_TUNNEL] = { 474 .encap = XFRM_MODE_TUNNEL, 475 .flags = XFRM_MODE_FLAG_TUNNEL, 476 .family = AF_INET, 477 }, 478 [XFRM_MODE_IPTFS] = { 479 .encap = XFRM_MODE_IPTFS, 480 .flags = XFRM_MODE_FLAG_TUNNEL, 481 .family = AF_INET, 482 }, 483 }; 484 485 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = { 486 [XFRM_MODE_BEET] = { 487 .encap = XFRM_MODE_BEET, 488 .flags = XFRM_MODE_FLAG_TUNNEL, 489 .family = AF_INET6, 490 }, 491 [XFRM_MODE_ROUTEOPTIMIZATION] = { 492 .encap = XFRM_MODE_ROUTEOPTIMIZATION, 493 .family = AF_INET6, 494 }, 495 [XFRM_MODE_TRANSPORT] = { 496 .encap = XFRM_MODE_TRANSPORT, 497 .family = AF_INET6, 498 }, 499 [XFRM_MODE_TUNNEL] = { 500 .encap = XFRM_MODE_TUNNEL, 501 .flags = XFRM_MODE_FLAG_TUNNEL, 502 .family = AF_INET6, 503 }, 504 [XFRM_MODE_IPTFS] = { 505 .encap = XFRM_MODE_IPTFS, 506 .flags = XFRM_MODE_FLAG_TUNNEL, 507 .family = AF_INET6, 508 }, 509 }; 510 511 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 512 { 513 const struct xfrm_mode *mode; 514 515 if (unlikely(encap >= XFRM_MODE_MAX)) 516 return NULL; 517 518 switch (family) { 519 case AF_INET: 520 mode = &xfrm4_mode_map[encap]; 521 if (mode->family == family) 522 return mode; 523 break; 524 case AF_INET6: 525 mode = &xfrm6_mode_map[encap]; 526 if (mode->family == family) 527 return mode; 528 break; 529 default: 530 break; 531 } 532 533 return NULL; 534 } 535 536 static const struct xfrm_mode_cbs __rcu *xfrm_mode_cbs_map[XFRM_MODE_MAX]; 537 static DEFINE_SPINLOCK(xfrm_mode_cbs_map_lock); 538 539 int xfrm_register_mode_cbs(u8 mode, const struct xfrm_mode_cbs *mode_cbs) 540 { 541 if (mode >= XFRM_MODE_MAX) 542 return -EINVAL; 543 544 spin_lock_bh(&xfrm_mode_cbs_map_lock); 545 rcu_assign_pointer(xfrm_mode_cbs_map[mode], mode_cbs); 546 spin_unlock_bh(&xfrm_mode_cbs_map_lock); 547 548 return 0; 549 } 550 EXPORT_SYMBOL(xfrm_register_mode_cbs); 551 552 void xfrm_unregister_mode_cbs(u8 mode) 553 { 554 if (mode >= XFRM_MODE_MAX) 555 return; 556 557 spin_lock_bh(&xfrm_mode_cbs_map_lock); 558 RCU_INIT_POINTER(xfrm_mode_cbs_map[mode], NULL); 559 spin_unlock_bh(&xfrm_mode_cbs_map_lock); 560 synchronize_rcu(); 561 } 562 EXPORT_SYMBOL(xfrm_unregister_mode_cbs); 563 564 static const struct xfrm_mode_cbs *xfrm_get_mode_cbs(u8 mode) 565 { 566 const struct xfrm_mode_cbs *cbs; 567 bool try_load = true; 568 569 if (mode >= XFRM_MODE_MAX) 570 return NULL; 571 572 retry: 573 rcu_read_lock(); 574 575 cbs = rcu_dereference(xfrm_mode_cbs_map[mode]); 576 if (cbs && !try_module_get(cbs->owner)) 577 cbs = NULL; 578 579 rcu_read_unlock(); 580 581 if (mode == XFRM_MODE_IPTFS && !cbs && try_load) { 582 request_module("xfrm-iptfs"); 583 try_load = false; 584 goto retry; 585 } 586 587 return cbs; 588 } 589 590 void xfrm_state_free(struct xfrm_state *x) 591 { 592 kmem_cache_free(xfrm_state_cache, x); 593 } 594 EXPORT_SYMBOL(xfrm_state_free); 595 596 static void ___xfrm_state_destroy(struct xfrm_state *x) 597 { 598 if (x->mode_cbs && x->mode_cbs->destroy_state) 599 x->mode_cbs->destroy_state(x); 600 hrtimer_cancel(&x->mtimer); 601 del_timer_sync(&x->rtimer); 602 kfree(x->aead); 603 kfree(x->aalg); 604 kfree(x->ealg); 605 kfree(x->calg); 606 kfree(x->encap); 607 kfree(x->coaddr); 608 kfree(x->replay_esn); 609 kfree(x->preplay_esn); 610 if (x->type) { 611 x->type->destructor(x); 612 xfrm_put_type(x->type); 613 } 614 if (x->xfrag.page) 615 put_page(x->xfrag.page); 616 xfrm_dev_state_free(x); 617 security_xfrm_state_free(x); 618 xfrm_state_free(x); 619 } 620 621 static void xfrm_state_gc_task(struct work_struct *work) 622 { 623 struct xfrm_state *x; 624 struct hlist_node *tmp; 625 struct hlist_head gc_list; 626 627 spin_lock_bh(&xfrm_state_gc_lock); 628 hlist_move_list(&xfrm_state_gc_list, &gc_list); 629 spin_unlock_bh(&xfrm_state_gc_lock); 630 631 synchronize_rcu(); 632 633 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 634 ___xfrm_state_destroy(x); 635 } 636 637 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 638 { 639 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer); 640 enum hrtimer_restart ret = HRTIMER_NORESTART; 641 time64_t now = ktime_get_real_seconds(); 642 time64_t next = TIME64_MAX; 643 int warn = 0; 644 int err = 0; 645 646 spin_lock(&x->lock); 647 xfrm_dev_state_update_stats(x); 648 649 if (x->km.state == XFRM_STATE_DEAD) 650 goto out; 651 if (x->km.state == XFRM_STATE_EXPIRED) 652 goto expired; 653 if (x->lft.hard_add_expires_seconds) { 654 time64_t tmo = x->lft.hard_add_expires_seconds + 655 x->curlft.add_time - now; 656 if (tmo <= 0) { 657 if (x->xflags & XFRM_SOFT_EXPIRE) { 658 /* enter hard expire without soft expire first?! 659 * setting a new date could trigger this. 660 * workaround: fix x->curflt.add_time by below: 661 */ 662 x->curlft.add_time = now - x->saved_tmo - 1; 663 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 664 } else 665 goto expired; 666 } 667 if (tmo < next) 668 next = tmo; 669 } 670 if (x->lft.hard_use_expires_seconds) { 671 time64_t tmo = x->lft.hard_use_expires_seconds + 672 (READ_ONCE(x->curlft.use_time) ? : now) - now; 673 if (tmo <= 0) 674 goto expired; 675 if (tmo < next) 676 next = tmo; 677 } 678 if (x->km.dying) 679 goto resched; 680 if (x->lft.soft_add_expires_seconds) { 681 time64_t tmo = x->lft.soft_add_expires_seconds + 682 x->curlft.add_time - now; 683 if (tmo <= 0) { 684 warn = 1; 685 x->xflags &= ~XFRM_SOFT_EXPIRE; 686 } else if (tmo < next) { 687 next = tmo; 688 x->xflags |= XFRM_SOFT_EXPIRE; 689 x->saved_tmo = tmo; 690 } 691 } 692 if (x->lft.soft_use_expires_seconds) { 693 time64_t tmo = x->lft.soft_use_expires_seconds + 694 (READ_ONCE(x->curlft.use_time) ? : now) - now; 695 if (tmo <= 0) 696 warn = 1; 697 else if (tmo < next) 698 next = tmo; 699 } 700 701 x->km.dying = warn; 702 if (warn) 703 km_state_expired(x, 0, 0); 704 resched: 705 if (next != TIME64_MAX) { 706 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0)); 707 ret = HRTIMER_RESTART; 708 } 709 710 goto out; 711 712 expired: 713 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 714 x->km.state = XFRM_STATE_EXPIRED; 715 716 err = __xfrm_state_delete(x); 717 if (!err) 718 km_state_expired(x, 1, 0); 719 720 xfrm_audit_state_delete(x, err ? 0 : 1, true); 721 722 out: 723 spin_unlock(&x->lock); 724 return ret; 725 } 726 727 static void xfrm_replay_timer_handler(struct timer_list *t); 728 729 struct xfrm_state *xfrm_state_alloc(struct net *net) 730 { 731 struct xfrm_state *x; 732 733 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC); 734 735 if (x) { 736 write_pnet(&x->xs_net, net); 737 refcount_set(&x->refcnt, 1); 738 atomic_set(&x->tunnel_users, 0); 739 INIT_LIST_HEAD(&x->km.all); 740 INIT_HLIST_NODE(&x->state_cache); 741 INIT_HLIST_NODE(&x->bydst); 742 INIT_HLIST_NODE(&x->bysrc); 743 INIT_HLIST_NODE(&x->byspi); 744 INIT_HLIST_NODE(&x->byseq); 745 hrtimer_setup(&x->mtimer, xfrm_timer_handler, CLOCK_BOOTTIME, 746 HRTIMER_MODE_ABS_SOFT); 747 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 748 x->curlft.add_time = ktime_get_real_seconds(); 749 x->lft.soft_byte_limit = XFRM_INF; 750 x->lft.soft_packet_limit = XFRM_INF; 751 x->lft.hard_byte_limit = XFRM_INF; 752 x->lft.hard_packet_limit = XFRM_INF; 753 x->replay_maxage = 0; 754 x->replay_maxdiff = 0; 755 x->pcpu_num = UINT_MAX; 756 spin_lock_init(&x->lock); 757 x->mode_data = NULL; 758 } 759 return x; 760 } 761 EXPORT_SYMBOL(xfrm_state_alloc); 762 763 #ifdef CONFIG_XFRM_OFFLOAD 764 void xfrm_dev_state_delete(struct xfrm_state *x) 765 { 766 struct xfrm_dev_offload *xso = &x->xso; 767 struct net_device *dev = READ_ONCE(xso->dev); 768 769 if (dev) { 770 dev->xfrmdev_ops->xdo_dev_state_delete(x); 771 spin_lock_bh(&xfrm_state_dev_gc_lock); 772 hlist_add_head(&x->dev_gclist, &xfrm_state_dev_gc_list); 773 spin_unlock_bh(&xfrm_state_dev_gc_lock); 774 } 775 } 776 EXPORT_SYMBOL_GPL(xfrm_dev_state_delete); 777 778 void xfrm_dev_state_free(struct xfrm_state *x) 779 { 780 struct xfrm_dev_offload *xso = &x->xso; 781 struct net_device *dev = READ_ONCE(xso->dev); 782 783 xfrm_unset_type_offload(x); 784 785 if (dev && dev->xfrmdev_ops) { 786 spin_lock_bh(&xfrm_state_dev_gc_lock); 787 if (!hlist_unhashed(&x->dev_gclist)) 788 hlist_del(&x->dev_gclist); 789 spin_unlock_bh(&xfrm_state_dev_gc_lock); 790 791 if (dev->xfrmdev_ops->xdo_dev_state_free) 792 dev->xfrmdev_ops->xdo_dev_state_free(x); 793 WRITE_ONCE(xso->dev, NULL); 794 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 795 netdev_put(dev, &xso->dev_tracker); 796 } 797 } 798 #endif 799 800 void __xfrm_state_destroy(struct xfrm_state *x, bool sync) 801 { 802 WARN_ON(x->km.state != XFRM_STATE_DEAD); 803 804 if (sync) { 805 synchronize_rcu(); 806 ___xfrm_state_destroy(x); 807 } else { 808 spin_lock_bh(&xfrm_state_gc_lock); 809 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 810 spin_unlock_bh(&xfrm_state_gc_lock); 811 schedule_work(&xfrm_state_gc_work); 812 } 813 } 814 EXPORT_SYMBOL(__xfrm_state_destroy); 815 816 int __xfrm_state_delete(struct xfrm_state *x) 817 { 818 struct net *net = xs_net(x); 819 int err = -ESRCH; 820 821 if (x->km.state != XFRM_STATE_DEAD) { 822 x->km.state = XFRM_STATE_DEAD; 823 824 spin_lock(&net->xfrm.xfrm_state_lock); 825 list_del(&x->km.all); 826 hlist_del_rcu(&x->bydst); 827 hlist_del_rcu(&x->bysrc); 828 if (x->km.seq) 829 hlist_del_rcu(&x->byseq); 830 if (!hlist_unhashed(&x->state_cache)) 831 hlist_del_rcu(&x->state_cache); 832 if (!hlist_unhashed(&x->state_cache_input)) 833 hlist_del_rcu(&x->state_cache_input); 834 835 if (x->id.spi) 836 hlist_del_rcu(&x->byspi); 837 net->xfrm.state_num--; 838 xfrm_nat_keepalive_state_updated(x); 839 spin_unlock(&net->xfrm.xfrm_state_lock); 840 841 if (x->encap_sk) 842 sock_put(rcu_dereference_raw(x->encap_sk)); 843 844 xfrm_dev_state_delete(x); 845 846 /* All xfrm_state objects are created by xfrm_state_alloc. 847 * The xfrm_state_alloc call gives a reference, and that 848 * is what we are dropping here. 849 */ 850 xfrm_state_put(x); 851 err = 0; 852 } 853 854 return err; 855 } 856 EXPORT_SYMBOL(__xfrm_state_delete); 857 858 int xfrm_state_delete(struct xfrm_state *x) 859 { 860 int err; 861 862 spin_lock_bh(&x->lock); 863 err = __xfrm_state_delete(x); 864 spin_unlock_bh(&x->lock); 865 866 return err; 867 } 868 EXPORT_SYMBOL(xfrm_state_delete); 869 870 #ifdef CONFIG_SECURITY_NETWORK_XFRM 871 static inline int 872 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 873 { 874 int i, err = 0; 875 876 for (i = 0; i <= net->xfrm.state_hmask; i++) { 877 struct xfrm_state *x; 878 879 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 880 if (xfrm_id_proto_match(x->id.proto, proto) && 881 (err = security_xfrm_state_delete(x)) != 0) { 882 xfrm_audit_state_delete(x, 0, task_valid); 883 return err; 884 } 885 } 886 } 887 888 return err; 889 } 890 891 static inline int 892 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 893 { 894 int i, err = 0; 895 896 for (i = 0; i <= net->xfrm.state_hmask; i++) { 897 struct xfrm_state *x; 898 struct xfrm_dev_offload *xso; 899 900 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 901 xso = &x->xso; 902 903 if (xso->dev == dev && 904 (err = security_xfrm_state_delete(x)) != 0) { 905 xfrm_audit_state_delete(x, 0, task_valid); 906 return err; 907 } 908 } 909 } 910 911 return err; 912 } 913 #else 914 static inline int 915 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 916 { 917 return 0; 918 } 919 920 static inline int 921 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 922 { 923 return 0; 924 } 925 #endif 926 927 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync) 928 { 929 int i, err = 0, cnt = 0; 930 931 spin_lock_bh(&net->xfrm.xfrm_state_lock); 932 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 933 if (err) 934 goto out; 935 936 err = -ESRCH; 937 for (i = 0; i <= net->xfrm.state_hmask; i++) { 938 struct xfrm_state *x; 939 restart: 940 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 941 if (!xfrm_state_kern(x) && 942 xfrm_id_proto_match(x->id.proto, proto)) { 943 xfrm_state_hold(x); 944 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 945 946 err = xfrm_state_delete(x); 947 xfrm_audit_state_delete(x, err ? 0 : 1, 948 task_valid); 949 if (sync) 950 xfrm_state_put_sync(x); 951 else 952 xfrm_state_put(x); 953 if (!err) 954 cnt++; 955 956 spin_lock_bh(&net->xfrm.xfrm_state_lock); 957 goto restart; 958 } 959 } 960 } 961 out: 962 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 963 if (cnt) 964 err = 0; 965 966 return err; 967 } 968 EXPORT_SYMBOL(xfrm_state_flush); 969 970 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 971 { 972 struct xfrm_state *x; 973 struct hlist_node *tmp; 974 struct xfrm_dev_offload *xso; 975 int i, err = 0, cnt = 0; 976 977 spin_lock_bh(&net->xfrm.xfrm_state_lock); 978 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 979 if (err) 980 goto out; 981 982 err = -ESRCH; 983 for (i = 0; i <= net->xfrm.state_hmask; i++) { 984 restart: 985 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 986 xso = &x->xso; 987 988 if (!xfrm_state_kern(x) && xso->dev == dev) { 989 xfrm_state_hold(x); 990 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 991 992 err = xfrm_state_delete(x); 993 xfrm_dev_state_free(x); 994 995 xfrm_audit_state_delete(x, err ? 0 : 1, 996 task_valid); 997 xfrm_state_put(x); 998 if (!err) 999 cnt++; 1000 1001 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1002 goto restart; 1003 } 1004 } 1005 } 1006 if (cnt) 1007 err = 0; 1008 1009 out: 1010 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1011 1012 spin_lock_bh(&xfrm_state_dev_gc_lock); 1013 restart_gc: 1014 hlist_for_each_entry_safe(x, tmp, &xfrm_state_dev_gc_list, dev_gclist) { 1015 xso = &x->xso; 1016 1017 if (xso->dev == dev) { 1018 spin_unlock_bh(&xfrm_state_dev_gc_lock); 1019 xfrm_dev_state_free(x); 1020 spin_lock_bh(&xfrm_state_dev_gc_lock); 1021 goto restart_gc; 1022 } 1023 1024 } 1025 spin_unlock_bh(&xfrm_state_dev_gc_lock); 1026 1027 xfrm_flush_gc(); 1028 1029 return err; 1030 } 1031 EXPORT_SYMBOL(xfrm_dev_state_flush); 1032 1033 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 1034 { 1035 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1036 si->sadcnt = net->xfrm.state_num; 1037 si->sadhcnt = net->xfrm.state_hmask + 1; 1038 si->sadhmcnt = xfrm_state_hashmax; 1039 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1040 } 1041 EXPORT_SYMBOL(xfrm_sad_getinfo); 1042 1043 static void 1044 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 1045 { 1046 const struct flowi4 *fl4 = &fl->u.ip4; 1047 1048 sel->daddr.a4 = fl4->daddr; 1049 sel->saddr.a4 = fl4->saddr; 1050 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 1051 sel->dport_mask = htons(0xffff); 1052 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 1053 sel->sport_mask = htons(0xffff); 1054 sel->family = AF_INET; 1055 sel->prefixlen_d = 32; 1056 sel->prefixlen_s = 32; 1057 sel->proto = fl4->flowi4_proto; 1058 sel->ifindex = fl4->flowi4_oif; 1059 } 1060 1061 static void 1062 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 1063 { 1064 const struct flowi6 *fl6 = &fl->u.ip6; 1065 1066 /* Initialize temporary selector matching only to current session. */ 1067 *(struct in6_addr *)&sel->daddr = fl6->daddr; 1068 *(struct in6_addr *)&sel->saddr = fl6->saddr; 1069 sel->dport = xfrm_flowi_dport(fl, &fl6->uli); 1070 sel->dport_mask = htons(0xffff); 1071 sel->sport = xfrm_flowi_sport(fl, &fl6->uli); 1072 sel->sport_mask = htons(0xffff); 1073 sel->family = AF_INET6; 1074 sel->prefixlen_d = 128; 1075 sel->prefixlen_s = 128; 1076 sel->proto = fl6->flowi6_proto; 1077 sel->ifindex = fl6->flowi6_oif; 1078 } 1079 1080 static void 1081 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 1082 const struct xfrm_tmpl *tmpl, 1083 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1084 unsigned short family) 1085 { 1086 switch (family) { 1087 case AF_INET: 1088 __xfrm4_init_tempsel(&x->sel, fl); 1089 break; 1090 case AF_INET6: 1091 __xfrm6_init_tempsel(&x->sel, fl); 1092 break; 1093 } 1094 1095 x->id = tmpl->id; 1096 1097 switch (tmpl->encap_family) { 1098 case AF_INET: 1099 if (x->id.daddr.a4 == 0) 1100 x->id.daddr.a4 = daddr->a4; 1101 x->props.saddr = tmpl->saddr; 1102 if (x->props.saddr.a4 == 0) 1103 x->props.saddr.a4 = saddr->a4; 1104 break; 1105 case AF_INET6: 1106 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) 1107 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 1108 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 1109 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) 1110 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 1111 break; 1112 } 1113 1114 x->props.mode = tmpl->mode; 1115 x->props.reqid = tmpl->reqid; 1116 x->props.family = tmpl->encap_family; 1117 } 1118 1119 struct xfrm_hash_state_ptrs { 1120 const struct hlist_head *bydst; 1121 const struct hlist_head *bysrc; 1122 const struct hlist_head *byspi; 1123 unsigned int hmask; 1124 }; 1125 1126 static void xfrm_hash_ptrs_get(const struct net *net, struct xfrm_hash_state_ptrs *ptrs) 1127 { 1128 unsigned int sequence; 1129 1130 do { 1131 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 1132 1133 ptrs->bydst = xfrm_state_deref_check(net->xfrm.state_bydst, net); 1134 ptrs->bysrc = xfrm_state_deref_check(net->xfrm.state_bysrc, net); 1135 ptrs->byspi = xfrm_state_deref_check(net->xfrm.state_byspi, net); 1136 ptrs->hmask = net->xfrm.state_hmask; 1137 } while (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)); 1138 } 1139 1140 static struct xfrm_state *__xfrm_state_lookup_all(const struct xfrm_hash_state_ptrs *state_ptrs, 1141 u32 mark, 1142 const xfrm_address_t *daddr, 1143 __be32 spi, u8 proto, 1144 unsigned short family, 1145 struct xfrm_dev_offload *xdo) 1146 { 1147 unsigned int h = __xfrm_spi_hash(daddr, spi, proto, family, state_ptrs->hmask); 1148 struct xfrm_state *x; 1149 1150 hlist_for_each_entry_rcu(x, state_ptrs->byspi + h, byspi) { 1151 #ifdef CONFIG_XFRM_OFFLOAD 1152 if (xdo->type == XFRM_DEV_OFFLOAD_PACKET) { 1153 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1154 /* HW states are in the head of list, there is 1155 * no need to iterate further. 1156 */ 1157 break; 1158 1159 /* Packet offload: both policy and SA should 1160 * have same device. 1161 */ 1162 if (xdo->dev != x->xso.dev) 1163 continue; 1164 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1165 /* Skip HW policy for SW lookups */ 1166 continue; 1167 #endif 1168 if (x->props.family != family || 1169 x->id.spi != spi || 1170 x->id.proto != proto || 1171 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1172 continue; 1173 1174 if ((mark & x->mark.m) != x->mark.v) 1175 continue; 1176 if (!xfrm_state_hold_rcu(x)) 1177 continue; 1178 return x; 1179 } 1180 1181 return NULL; 1182 } 1183 1184 static struct xfrm_state *__xfrm_state_lookup(const struct xfrm_hash_state_ptrs *state_ptrs, 1185 u32 mark, 1186 const xfrm_address_t *daddr, 1187 __be32 spi, u8 proto, 1188 unsigned short family) 1189 { 1190 unsigned int h = __xfrm_spi_hash(daddr, spi, proto, family, state_ptrs->hmask); 1191 struct xfrm_state *x; 1192 1193 hlist_for_each_entry_rcu(x, state_ptrs->byspi + h, byspi) { 1194 if (x->props.family != family || 1195 x->id.spi != spi || 1196 x->id.proto != proto || 1197 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1198 continue; 1199 1200 if ((mark & x->mark.m) != x->mark.v) 1201 continue; 1202 if (!xfrm_state_hold_rcu(x)) 1203 continue; 1204 return x; 1205 } 1206 1207 return NULL; 1208 } 1209 1210 struct xfrm_state *xfrm_input_state_lookup(struct net *net, u32 mark, 1211 const xfrm_address_t *daddr, 1212 __be32 spi, u8 proto, 1213 unsigned short family) 1214 { 1215 struct xfrm_hash_state_ptrs state_ptrs; 1216 struct hlist_head *state_cache_input; 1217 struct xfrm_state *x = NULL; 1218 1219 state_cache_input = raw_cpu_ptr(net->xfrm.state_cache_input); 1220 1221 rcu_read_lock(); 1222 hlist_for_each_entry_rcu(x, state_cache_input, state_cache_input) { 1223 if (x->props.family != family || 1224 x->id.spi != spi || 1225 x->id.proto != proto || 1226 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1227 continue; 1228 1229 if ((mark & x->mark.m) != x->mark.v) 1230 continue; 1231 if (!xfrm_state_hold_rcu(x)) 1232 continue; 1233 goto out; 1234 } 1235 1236 xfrm_hash_ptrs_get(net, &state_ptrs); 1237 1238 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 1239 1240 if (x && x->km.state == XFRM_STATE_VALID) { 1241 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1242 if (hlist_unhashed(&x->state_cache_input)) { 1243 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1244 } else { 1245 hlist_del_rcu(&x->state_cache_input); 1246 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1247 } 1248 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1249 } 1250 1251 out: 1252 rcu_read_unlock(); 1253 return x; 1254 } 1255 EXPORT_SYMBOL(xfrm_input_state_lookup); 1256 1257 static struct xfrm_state *__xfrm_state_lookup_byaddr(const struct xfrm_hash_state_ptrs *state_ptrs, 1258 u32 mark, 1259 const xfrm_address_t *daddr, 1260 const xfrm_address_t *saddr, 1261 u8 proto, unsigned short family) 1262 { 1263 unsigned int h = __xfrm_src_hash(daddr, saddr, family, state_ptrs->hmask); 1264 struct xfrm_state *x; 1265 1266 hlist_for_each_entry_rcu(x, state_ptrs->bysrc + h, bysrc) { 1267 if (x->props.family != family || 1268 x->id.proto != proto || 1269 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1270 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1271 continue; 1272 1273 if ((mark & x->mark.m) != x->mark.v) 1274 continue; 1275 if (!xfrm_state_hold_rcu(x)) 1276 continue; 1277 return x; 1278 } 1279 1280 return NULL; 1281 } 1282 1283 static inline struct xfrm_state * 1284 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 1285 { 1286 struct xfrm_hash_state_ptrs state_ptrs; 1287 struct net *net = xs_net(x); 1288 u32 mark = x->mark.v & x->mark.m; 1289 1290 xfrm_hash_ptrs_get(net, &state_ptrs); 1291 1292 if (use_spi) 1293 return __xfrm_state_lookup(&state_ptrs, mark, &x->id.daddr, 1294 x->id.spi, x->id.proto, family); 1295 else 1296 return __xfrm_state_lookup_byaddr(&state_ptrs, mark, 1297 &x->id.daddr, 1298 &x->props.saddr, 1299 x->id.proto, family); 1300 } 1301 1302 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 1303 { 1304 if (have_hash_collision && 1305 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 1306 net->xfrm.state_num > net->xfrm.state_hmask) 1307 schedule_work(&net->xfrm.state_hash_work); 1308 } 1309 1310 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 1311 const struct flowi *fl, unsigned short family, 1312 struct xfrm_state **best, int *acq_in_progress, 1313 int *error) 1314 { 1315 /* We need the cpu id just as a lookup key, 1316 * we don't require it to be stable. 1317 */ 1318 unsigned int pcpu_id = get_cpu(); 1319 put_cpu(); 1320 1321 /* Resolution logic: 1322 * 1. There is a valid state with matching selector. Done. 1323 * 2. Valid state with inappropriate selector. Skip. 1324 * 1325 * Entering area of "sysdeps". 1326 * 1327 * 3. If state is not valid, selector is temporary, it selects 1328 * only session which triggered previous resolution. Key 1329 * manager will do something to install a state with proper 1330 * selector. 1331 */ 1332 if (x->km.state == XFRM_STATE_VALID) { 1333 if ((x->sel.family && 1334 (x->sel.family != family || 1335 !xfrm_selector_match(&x->sel, fl, family))) || 1336 !security_xfrm_state_pol_flow_match(x, pol, 1337 &fl->u.__fl_common)) 1338 return; 1339 1340 if (x->pcpu_num != UINT_MAX && x->pcpu_num != pcpu_id) 1341 return; 1342 1343 if (!*best || 1344 ((*best)->pcpu_num == UINT_MAX && x->pcpu_num == pcpu_id) || 1345 (*best)->km.dying > x->km.dying || 1346 ((*best)->km.dying == x->km.dying && 1347 (*best)->curlft.add_time < x->curlft.add_time)) 1348 *best = x; 1349 } else if (x->km.state == XFRM_STATE_ACQ) { 1350 if (!*best || x->pcpu_num == pcpu_id) 1351 *acq_in_progress = 1; 1352 } else if (x->km.state == XFRM_STATE_ERROR || 1353 x->km.state == XFRM_STATE_EXPIRED) { 1354 if ((!x->sel.family || 1355 (x->sel.family == family && 1356 xfrm_selector_match(&x->sel, fl, family))) && 1357 security_xfrm_state_pol_flow_match(x, pol, 1358 &fl->u.__fl_common)) 1359 *error = -ESRCH; 1360 } 1361 } 1362 1363 struct xfrm_state * 1364 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1365 const struct flowi *fl, struct xfrm_tmpl *tmpl, 1366 struct xfrm_policy *pol, int *err, 1367 unsigned short family, u32 if_id) 1368 { 1369 static xfrm_address_t saddr_wildcard = { }; 1370 struct xfrm_hash_state_ptrs state_ptrs; 1371 struct net *net = xp_net(pol); 1372 unsigned int h, h_wildcard; 1373 struct xfrm_state *x, *x0, *to_put; 1374 int acquire_in_progress = 0; 1375 int error = 0; 1376 struct xfrm_state *best = NULL; 1377 u32 mark = pol->mark.v & pol->mark.m; 1378 unsigned short encap_family = tmpl->encap_family; 1379 unsigned int sequence; 1380 struct km_event c; 1381 unsigned int pcpu_id; 1382 bool cached = false; 1383 1384 /* We need the cpu id just as a lookup key, 1385 * we don't require it to be stable. 1386 */ 1387 pcpu_id = get_cpu(); 1388 put_cpu(); 1389 1390 to_put = NULL; 1391 1392 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 1393 1394 rcu_read_lock(); 1395 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1396 if (x->props.family == encap_family && 1397 x->props.reqid == tmpl->reqid && 1398 (mark & x->mark.m) == x->mark.v && 1399 x->if_id == if_id && 1400 !(x->props.flags & XFRM_STATE_WILDRECV) && 1401 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1402 tmpl->mode == x->props.mode && 1403 tmpl->id.proto == x->id.proto && 1404 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1405 xfrm_state_look_at(pol, x, fl, encap_family, 1406 &best, &acquire_in_progress, &error); 1407 } 1408 1409 if (best) 1410 goto cached; 1411 1412 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1413 if (x->props.family == encap_family && 1414 x->props.reqid == tmpl->reqid && 1415 (mark & x->mark.m) == x->mark.v && 1416 x->if_id == if_id && 1417 !(x->props.flags & XFRM_STATE_WILDRECV) && 1418 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1419 tmpl->mode == x->props.mode && 1420 tmpl->id.proto == x->id.proto && 1421 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1422 xfrm_state_look_at(pol, x, fl, family, 1423 &best, &acquire_in_progress, &error); 1424 } 1425 1426 cached: 1427 cached = true; 1428 if (best) 1429 goto found; 1430 else if (error) 1431 best = NULL; 1432 else if (acquire_in_progress) /* XXX: acquire_in_progress should not happen */ 1433 WARN_ON(1); 1434 1435 xfrm_hash_ptrs_get(net, &state_ptrs); 1436 1437 h = __xfrm_dst_hash(daddr, saddr, tmpl->reqid, encap_family, state_ptrs.hmask); 1438 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h, bydst) { 1439 #ifdef CONFIG_XFRM_OFFLOAD 1440 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1441 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1442 /* HW states are in the head of list, there is 1443 * no need to iterate further. 1444 */ 1445 break; 1446 1447 /* Packet offload: both policy and SA should 1448 * have same device. 1449 */ 1450 if (pol->xdo.dev != x->xso.dev) 1451 continue; 1452 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1453 /* Skip HW policy for SW lookups */ 1454 continue; 1455 #endif 1456 if (x->props.family == encap_family && 1457 x->props.reqid == tmpl->reqid && 1458 (mark & x->mark.m) == x->mark.v && 1459 x->if_id == if_id && 1460 !(x->props.flags & XFRM_STATE_WILDRECV) && 1461 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1462 tmpl->mode == x->props.mode && 1463 tmpl->id.proto == x->id.proto && 1464 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1465 xfrm_state_look_at(pol, x, fl, family, 1466 &best, &acquire_in_progress, &error); 1467 } 1468 if (best || acquire_in_progress) 1469 goto found; 1470 1471 h_wildcard = __xfrm_dst_hash(daddr, &saddr_wildcard, tmpl->reqid, 1472 encap_family, state_ptrs.hmask); 1473 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h_wildcard, bydst) { 1474 #ifdef CONFIG_XFRM_OFFLOAD 1475 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1476 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1477 /* HW states are in the head of list, there is 1478 * no need to iterate further. 1479 */ 1480 break; 1481 1482 /* Packet offload: both policy and SA should 1483 * have same device. 1484 */ 1485 if (pol->xdo.dev != x->xso.dev) 1486 continue; 1487 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1488 /* Skip HW policy for SW lookups */ 1489 continue; 1490 #endif 1491 if (x->props.family == encap_family && 1492 x->props.reqid == tmpl->reqid && 1493 (mark & x->mark.m) == x->mark.v && 1494 x->if_id == if_id && 1495 !(x->props.flags & XFRM_STATE_WILDRECV) && 1496 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1497 tmpl->mode == x->props.mode && 1498 tmpl->id.proto == x->id.proto && 1499 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1500 xfrm_state_look_at(pol, x, fl, family, 1501 &best, &acquire_in_progress, &error); 1502 } 1503 1504 found: 1505 if (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || 1506 (best && (best->pcpu_num == pcpu_id))) 1507 x = best; 1508 1509 if (!x && !error && !acquire_in_progress) { 1510 if (tmpl->id.spi && 1511 (x0 = __xfrm_state_lookup_all(&state_ptrs, mark, daddr, 1512 tmpl->id.spi, tmpl->id.proto, 1513 encap_family, 1514 &pol->xdo)) != NULL) { 1515 to_put = x0; 1516 error = -EEXIST; 1517 goto out; 1518 } 1519 1520 c.net = net; 1521 /* If the KMs have no listeners (yet...), avoid allocating an SA 1522 * for each and every packet - garbage collection might not 1523 * handle the flood. 1524 */ 1525 if (!km_is_alive(&c)) { 1526 error = -ESRCH; 1527 goto out; 1528 } 1529 1530 x = xfrm_state_alloc(net); 1531 if (x == NULL) { 1532 error = -ENOMEM; 1533 goto out; 1534 } 1535 /* Initialize temporary state matching only 1536 * to current session. */ 1537 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1538 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1539 x->if_id = if_id; 1540 if ((pol->flags & XFRM_POLICY_CPU_ACQUIRE) && best) 1541 x->pcpu_num = pcpu_id; 1542 1543 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1544 if (error) { 1545 x->km.state = XFRM_STATE_DEAD; 1546 to_put = x; 1547 x = NULL; 1548 goto out; 1549 } 1550 #ifdef CONFIG_XFRM_OFFLOAD 1551 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1552 struct xfrm_dev_offload *xdo = &pol->xdo; 1553 struct xfrm_dev_offload *xso = &x->xso; 1554 1555 xso->type = XFRM_DEV_OFFLOAD_PACKET; 1556 xso->dir = xdo->dir; 1557 xso->dev = xdo->dev; 1558 xso->real_dev = xdo->real_dev; 1559 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ; 1560 netdev_hold(xso->dev, &xso->dev_tracker, GFP_ATOMIC); 1561 error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL); 1562 if (error) { 1563 xso->dir = 0; 1564 netdev_put(xso->dev, &xso->dev_tracker); 1565 xso->dev = NULL; 1566 xso->real_dev = NULL; 1567 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 1568 x->km.state = XFRM_STATE_DEAD; 1569 to_put = x; 1570 x = NULL; 1571 goto out; 1572 } 1573 } 1574 #endif 1575 if (km_query(x, tmpl, pol) == 0) { 1576 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1577 x->km.state = XFRM_STATE_ACQ; 1578 x->dir = XFRM_SA_DIR_OUT; 1579 list_add(&x->km.all, &net->xfrm.state_all); 1580 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 1581 XFRM_STATE_INSERT(bydst, &x->bydst, 1582 net->xfrm.state_bydst + h, 1583 x->xso.type); 1584 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1585 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1586 net->xfrm.state_bysrc + h, 1587 x->xso.type); 1588 INIT_HLIST_NODE(&x->state_cache); 1589 if (x->id.spi) { 1590 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1591 XFRM_STATE_INSERT(byspi, &x->byspi, 1592 net->xfrm.state_byspi + h, 1593 x->xso.type); 1594 } 1595 if (x->km.seq) { 1596 h = xfrm_seq_hash(net, x->km.seq); 1597 XFRM_STATE_INSERT(byseq, &x->byseq, 1598 net->xfrm.state_byseq + h, 1599 x->xso.type); 1600 } 1601 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1602 hrtimer_start(&x->mtimer, 1603 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1604 HRTIMER_MODE_REL_SOFT); 1605 net->xfrm.state_num++; 1606 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1607 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1608 } else { 1609 #ifdef CONFIG_XFRM_OFFLOAD 1610 struct xfrm_dev_offload *xso = &x->xso; 1611 1612 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) { 1613 xfrm_dev_state_delete(x); 1614 xfrm_dev_state_free(x); 1615 } 1616 #endif 1617 x->km.state = XFRM_STATE_DEAD; 1618 to_put = x; 1619 x = NULL; 1620 error = -ESRCH; 1621 } 1622 1623 /* Use the already installed 'fallback' while the CPU-specific 1624 * SA acquire is handled*/ 1625 if (best) 1626 x = best; 1627 } 1628 out: 1629 if (x) { 1630 if (!xfrm_state_hold_rcu(x)) { 1631 *err = -EAGAIN; 1632 x = NULL; 1633 } 1634 } else { 1635 *err = acquire_in_progress ? -EAGAIN : error; 1636 } 1637 1638 if (x && x->km.state == XFRM_STATE_VALID && !cached && 1639 (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || x->pcpu_num == pcpu_id)) { 1640 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1641 if (hlist_unhashed(&x->state_cache)) 1642 hlist_add_head_rcu(&x->state_cache, &pol->state_cache_list); 1643 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1644 } 1645 1646 rcu_read_unlock(); 1647 if (to_put) 1648 xfrm_state_put(to_put); 1649 1650 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) { 1651 *err = -EAGAIN; 1652 if (x) { 1653 xfrm_state_put(x); 1654 x = NULL; 1655 } 1656 } 1657 1658 return x; 1659 } 1660 1661 struct xfrm_state * 1662 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1663 xfrm_address_t *daddr, xfrm_address_t *saddr, 1664 unsigned short family, u8 mode, u8 proto, u32 reqid) 1665 { 1666 unsigned int h; 1667 struct xfrm_state *rx = NULL, *x = NULL; 1668 1669 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1670 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1671 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1672 if (x->props.family == family && 1673 x->props.reqid == reqid && 1674 (mark & x->mark.m) == x->mark.v && 1675 x->if_id == if_id && 1676 !(x->props.flags & XFRM_STATE_WILDRECV) && 1677 xfrm_state_addr_check(x, daddr, saddr, family) && 1678 mode == x->props.mode && 1679 proto == x->id.proto && 1680 x->km.state == XFRM_STATE_VALID) { 1681 rx = x; 1682 break; 1683 } 1684 } 1685 1686 if (rx) 1687 xfrm_state_hold(rx); 1688 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1689 1690 1691 return rx; 1692 } 1693 EXPORT_SYMBOL(xfrm_stateonly_find); 1694 1695 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1696 unsigned short family) 1697 { 1698 struct xfrm_state *x; 1699 struct xfrm_state_walk *w; 1700 1701 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1702 list_for_each_entry(w, &net->xfrm.state_all, all) { 1703 x = container_of(w, struct xfrm_state, km); 1704 if (x->props.family != family || 1705 x->id.spi != spi) 1706 continue; 1707 1708 xfrm_state_hold(x); 1709 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1710 return x; 1711 } 1712 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1713 return NULL; 1714 } 1715 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1716 1717 static void __xfrm_state_insert(struct xfrm_state *x) 1718 { 1719 struct net *net = xs_net(x); 1720 unsigned int h; 1721 1722 list_add(&x->km.all, &net->xfrm.state_all); 1723 1724 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1725 x->props.reqid, x->props.family); 1726 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h, 1727 x->xso.type); 1728 1729 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1730 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h, 1731 x->xso.type); 1732 1733 if (x->id.spi) { 1734 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1735 x->props.family); 1736 1737 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h, 1738 x->xso.type); 1739 } 1740 1741 if (x->km.seq) { 1742 h = xfrm_seq_hash(net, x->km.seq); 1743 1744 XFRM_STATE_INSERT(byseq, &x->byseq, net->xfrm.state_byseq + h, 1745 x->xso.type); 1746 } 1747 1748 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); 1749 if (x->replay_maxage) 1750 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1751 1752 net->xfrm.state_num++; 1753 1754 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1755 xfrm_nat_keepalive_state_updated(x); 1756 } 1757 1758 /* net->xfrm.xfrm_state_lock is held */ 1759 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1760 { 1761 struct net *net = xs_net(xnew); 1762 unsigned short family = xnew->props.family; 1763 u32 reqid = xnew->props.reqid; 1764 struct xfrm_state *x; 1765 unsigned int h; 1766 u32 mark = xnew->mark.v & xnew->mark.m; 1767 u32 if_id = xnew->if_id; 1768 u32 cpu_id = xnew->pcpu_num; 1769 1770 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1771 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1772 if (x->props.family == family && 1773 x->props.reqid == reqid && 1774 x->if_id == if_id && 1775 x->pcpu_num == cpu_id && 1776 (mark & x->mark.m) == x->mark.v && 1777 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1778 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1779 x->genid++; 1780 } 1781 } 1782 1783 void xfrm_state_insert(struct xfrm_state *x) 1784 { 1785 struct net *net = xs_net(x); 1786 1787 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1788 __xfrm_state_bump_genids(x); 1789 __xfrm_state_insert(x); 1790 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1791 } 1792 EXPORT_SYMBOL(xfrm_state_insert); 1793 1794 /* net->xfrm.xfrm_state_lock is held */ 1795 static struct xfrm_state *__find_acq_core(struct net *net, 1796 const struct xfrm_mark *m, 1797 unsigned short family, u8 mode, 1798 u32 reqid, u32 if_id, u32 pcpu_num, u8 proto, 1799 const xfrm_address_t *daddr, 1800 const xfrm_address_t *saddr, 1801 int create) 1802 { 1803 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1804 struct xfrm_state *x; 1805 u32 mark = m->v & m->m; 1806 1807 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1808 if (x->props.reqid != reqid || 1809 x->props.mode != mode || 1810 x->props.family != family || 1811 x->km.state != XFRM_STATE_ACQ || 1812 x->id.spi != 0 || 1813 x->id.proto != proto || 1814 (mark & x->mark.m) != x->mark.v || 1815 x->pcpu_num != pcpu_num || 1816 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1817 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1818 continue; 1819 1820 xfrm_state_hold(x); 1821 return x; 1822 } 1823 1824 if (!create) 1825 return NULL; 1826 1827 x = xfrm_state_alloc(net); 1828 if (likely(x)) { 1829 switch (family) { 1830 case AF_INET: 1831 x->sel.daddr.a4 = daddr->a4; 1832 x->sel.saddr.a4 = saddr->a4; 1833 x->sel.prefixlen_d = 32; 1834 x->sel.prefixlen_s = 32; 1835 x->props.saddr.a4 = saddr->a4; 1836 x->id.daddr.a4 = daddr->a4; 1837 break; 1838 1839 case AF_INET6: 1840 x->sel.daddr.in6 = daddr->in6; 1841 x->sel.saddr.in6 = saddr->in6; 1842 x->sel.prefixlen_d = 128; 1843 x->sel.prefixlen_s = 128; 1844 x->props.saddr.in6 = saddr->in6; 1845 x->id.daddr.in6 = daddr->in6; 1846 break; 1847 } 1848 1849 x->pcpu_num = pcpu_num; 1850 x->km.state = XFRM_STATE_ACQ; 1851 x->id.proto = proto; 1852 x->props.family = family; 1853 x->props.mode = mode; 1854 x->props.reqid = reqid; 1855 x->if_id = if_id; 1856 x->mark.v = m->v; 1857 x->mark.m = m->m; 1858 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1859 xfrm_state_hold(x); 1860 hrtimer_start(&x->mtimer, 1861 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1862 HRTIMER_MODE_REL_SOFT); 1863 list_add(&x->km.all, &net->xfrm.state_all); 1864 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h, 1865 x->xso.type); 1866 h = xfrm_src_hash(net, daddr, saddr, family); 1867 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h, 1868 x->xso.type); 1869 1870 net->xfrm.state_num++; 1871 1872 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1873 } 1874 1875 return x; 1876 } 1877 1878 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num); 1879 1880 int xfrm_state_add(struct xfrm_state *x) 1881 { 1882 struct net *net = xs_net(x); 1883 struct xfrm_state *x1, *to_put; 1884 int family; 1885 int err; 1886 u32 mark = x->mark.v & x->mark.m; 1887 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1888 1889 family = x->props.family; 1890 1891 to_put = NULL; 1892 1893 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1894 1895 x1 = __xfrm_state_locate(x, use_spi, family); 1896 if (x1) { 1897 to_put = x1; 1898 x1 = NULL; 1899 err = -EEXIST; 1900 goto out; 1901 } 1902 1903 if (use_spi && x->km.seq) { 1904 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq, x->pcpu_num); 1905 if (x1 && ((x1->id.proto != x->id.proto) || 1906 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1907 to_put = x1; 1908 x1 = NULL; 1909 } 1910 } 1911 1912 if (use_spi && !x1) 1913 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1914 x->props.reqid, x->if_id, x->pcpu_num, x->id.proto, 1915 &x->id.daddr, &x->props.saddr, 0); 1916 1917 __xfrm_state_bump_genids(x); 1918 __xfrm_state_insert(x); 1919 err = 0; 1920 1921 out: 1922 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1923 1924 if (x1) { 1925 xfrm_state_delete(x1); 1926 xfrm_state_put(x1); 1927 } 1928 1929 if (to_put) 1930 xfrm_state_put(to_put); 1931 1932 return err; 1933 } 1934 EXPORT_SYMBOL(xfrm_state_add); 1935 1936 #ifdef CONFIG_XFRM_MIGRATE 1937 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security) 1938 { 1939 struct xfrm_user_sec_ctx *uctx; 1940 int size = sizeof(*uctx) + security->ctx_len; 1941 int err; 1942 1943 uctx = kmalloc(size, GFP_KERNEL); 1944 if (!uctx) 1945 return -ENOMEM; 1946 1947 uctx->exttype = XFRMA_SEC_CTX; 1948 uctx->len = size; 1949 uctx->ctx_doi = security->ctx_doi; 1950 uctx->ctx_alg = security->ctx_alg; 1951 uctx->ctx_len = security->ctx_len; 1952 memcpy(uctx + 1, security->ctx_str, security->ctx_len); 1953 err = security_xfrm_state_alloc(x, uctx); 1954 kfree(uctx); 1955 if (err) 1956 return err; 1957 1958 return 0; 1959 } 1960 1961 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1962 struct xfrm_encap_tmpl *encap) 1963 { 1964 struct net *net = xs_net(orig); 1965 struct xfrm_state *x = xfrm_state_alloc(net); 1966 if (!x) 1967 goto out; 1968 1969 memcpy(&x->id, &orig->id, sizeof(x->id)); 1970 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1971 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1972 x->props.mode = orig->props.mode; 1973 x->props.replay_window = orig->props.replay_window; 1974 x->props.reqid = orig->props.reqid; 1975 x->props.family = orig->props.family; 1976 x->props.saddr = orig->props.saddr; 1977 1978 if (orig->aalg) { 1979 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1980 if (!x->aalg) 1981 goto error; 1982 } 1983 x->props.aalgo = orig->props.aalgo; 1984 1985 if (orig->aead) { 1986 x->aead = xfrm_algo_aead_clone(orig->aead); 1987 x->geniv = orig->geniv; 1988 if (!x->aead) 1989 goto error; 1990 } 1991 if (orig->ealg) { 1992 x->ealg = xfrm_algo_clone(orig->ealg); 1993 if (!x->ealg) 1994 goto error; 1995 } 1996 x->props.ealgo = orig->props.ealgo; 1997 1998 if (orig->calg) { 1999 x->calg = xfrm_algo_clone(orig->calg); 2000 if (!x->calg) 2001 goto error; 2002 } 2003 x->props.calgo = orig->props.calgo; 2004 2005 if (encap || orig->encap) { 2006 if (encap) 2007 x->encap = kmemdup(encap, sizeof(*x->encap), 2008 GFP_KERNEL); 2009 else 2010 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 2011 GFP_KERNEL); 2012 2013 if (!x->encap) 2014 goto error; 2015 } 2016 2017 if (orig->security) 2018 if (clone_security(x, orig->security)) 2019 goto error; 2020 2021 if (orig->coaddr) { 2022 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 2023 GFP_KERNEL); 2024 if (!x->coaddr) 2025 goto error; 2026 } 2027 2028 if (orig->replay_esn) { 2029 if (xfrm_replay_clone(x, orig)) 2030 goto error; 2031 } 2032 2033 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 2034 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark)); 2035 2036 x->props.flags = orig->props.flags; 2037 x->props.extra_flags = orig->props.extra_flags; 2038 2039 x->pcpu_num = orig->pcpu_num; 2040 x->if_id = orig->if_id; 2041 x->tfcpad = orig->tfcpad; 2042 x->replay_maxdiff = orig->replay_maxdiff; 2043 x->replay_maxage = orig->replay_maxage; 2044 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft)); 2045 x->km.state = orig->km.state; 2046 x->km.seq = orig->km.seq; 2047 x->replay = orig->replay; 2048 x->preplay = orig->preplay; 2049 x->mapping_maxage = orig->mapping_maxage; 2050 x->lastused = orig->lastused; 2051 x->new_mapping = 0; 2052 x->new_mapping_sport = 0; 2053 x->dir = orig->dir; 2054 2055 x->mode_cbs = orig->mode_cbs; 2056 if (x->mode_cbs && x->mode_cbs->clone_state) { 2057 if (x->mode_cbs->clone_state(x, orig)) 2058 goto error; 2059 } 2060 2061 return x; 2062 2063 error: 2064 xfrm_state_put(x); 2065 out: 2066 return NULL; 2067 } 2068 2069 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 2070 u32 if_id) 2071 { 2072 unsigned int h; 2073 struct xfrm_state *x = NULL; 2074 2075 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2076 2077 if (m->reqid) { 2078 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 2079 m->reqid, m->old_family); 2080 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 2081 if (x->props.mode != m->mode || 2082 x->id.proto != m->proto) 2083 continue; 2084 if (m->reqid && x->props.reqid != m->reqid) 2085 continue; 2086 if (if_id != 0 && x->if_id != if_id) 2087 continue; 2088 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2089 m->old_family) || 2090 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2091 m->old_family)) 2092 continue; 2093 xfrm_state_hold(x); 2094 break; 2095 } 2096 } else { 2097 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 2098 m->old_family); 2099 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 2100 if (x->props.mode != m->mode || 2101 x->id.proto != m->proto) 2102 continue; 2103 if (if_id != 0 && x->if_id != if_id) 2104 continue; 2105 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2106 m->old_family) || 2107 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2108 m->old_family)) 2109 continue; 2110 xfrm_state_hold(x); 2111 break; 2112 } 2113 } 2114 2115 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2116 2117 return x; 2118 } 2119 EXPORT_SYMBOL(xfrm_migrate_state_find); 2120 2121 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 2122 struct xfrm_migrate *m, 2123 struct xfrm_encap_tmpl *encap) 2124 { 2125 struct xfrm_state *xc; 2126 2127 xc = xfrm_state_clone(x, encap); 2128 if (!xc) 2129 return NULL; 2130 2131 xc->props.family = m->new_family; 2132 2133 if (xfrm_init_state(xc) < 0) 2134 goto error; 2135 2136 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 2137 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 2138 2139 /* add state */ 2140 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 2141 /* a care is needed when the destination address of the 2142 state is to be updated as it is a part of triplet */ 2143 xfrm_state_insert(xc); 2144 } else { 2145 if (xfrm_state_add(xc) < 0) 2146 goto error; 2147 } 2148 2149 return xc; 2150 error: 2151 xfrm_state_put(xc); 2152 return NULL; 2153 } 2154 EXPORT_SYMBOL(xfrm_state_migrate); 2155 #endif 2156 2157 int xfrm_state_update(struct xfrm_state *x) 2158 { 2159 struct xfrm_state *x1, *to_put; 2160 int err; 2161 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 2162 struct net *net = xs_net(x); 2163 2164 to_put = NULL; 2165 2166 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2167 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 2168 2169 err = -ESRCH; 2170 if (!x1) 2171 goto out; 2172 2173 if (xfrm_state_kern(x1)) { 2174 to_put = x1; 2175 err = -EEXIST; 2176 goto out; 2177 } 2178 2179 if (x1->km.state == XFRM_STATE_ACQ) { 2180 if (x->dir && x1->dir != x->dir) 2181 goto out; 2182 2183 __xfrm_state_insert(x); 2184 x = NULL; 2185 } else { 2186 if (x1->dir != x->dir) 2187 goto out; 2188 } 2189 err = 0; 2190 2191 out: 2192 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2193 2194 if (to_put) 2195 xfrm_state_put(to_put); 2196 2197 if (err) 2198 return err; 2199 2200 if (!x) { 2201 xfrm_state_delete(x1); 2202 xfrm_state_put(x1); 2203 return 0; 2204 } 2205 2206 err = -EINVAL; 2207 spin_lock_bh(&x1->lock); 2208 if (likely(x1->km.state == XFRM_STATE_VALID)) { 2209 if (x->encap && x1->encap && 2210 x->encap->encap_type == x1->encap->encap_type) 2211 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 2212 else if (x->encap || x1->encap) 2213 goto fail; 2214 2215 if (x->coaddr && x1->coaddr) { 2216 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 2217 } 2218 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 2219 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 2220 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 2221 x1->km.dying = 0; 2222 2223 hrtimer_start(&x1->mtimer, ktime_set(1, 0), 2224 HRTIMER_MODE_REL_SOFT); 2225 if (READ_ONCE(x1->curlft.use_time)) 2226 xfrm_state_check_expire(x1); 2227 2228 if (x->props.smark.m || x->props.smark.v || x->if_id) { 2229 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2230 2231 if (x->props.smark.m || x->props.smark.v) 2232 x1->props.smark = x->props.smark; 2233 2234 if (x->if_id) 2235 x1->if_id = x->if_id; 2236 2237 __xfrm_state_bump_genids(x1); 2238 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2239 } 2240 2241 err = 0; 2242 x->km.state = XFRM_STATE_DEAD; 2243 __xfrm_state_put(x); 2244 } 2245 2246 fail: 2247 spin_unlock_bh(&x1->lock); 2248 2249 xfrm_state_put(x1); 2250 2251 return err; 2252 } 2253 EXPORT_SYMBOL(xfrm_state_update); 2254 2255 int xfrm_state_check_expire(struct xfrm_state *x) 2256 { 2257 xfrm_dev_state_update_stats(x); 2258 2259 if (!READ_ONCE(x->curlft.use_time)) 2260 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds()); 2261 2262 if (x->curlft.bytes >= x->lft.hard_byte_limit || 2263 x->curlft.packets >= x->lft.hard_packet_limit) { 2264 x->km.state = XFRM_STATE_EXPIRED; 2265 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); 2266 return -EINVAL; 2267 } 2268 2269 if (!x->km.dying && 2270 (x->curlft.bytes >= x->lft.soft_byte_limit || 2271 x->curlft.packets >= x->lft.soft_packet_limit)) { 2272 x->km.dying = 1; 2273 km_state_expired(x, 0, 0); 2274 } 2275 return 0; 2276 } 2277 EXPORT_SYMBOL(xfrm_state_check_expire); 2278 2279 void xfrm_state_update_stats(struct net *net) 2280 { 2281 struct xfrm_state *x; 2282 int i; 2283 2284 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2285 for (i = 0; i <= net->xfrm.state_hmask; i++) { 2286 hlist_for_each_entry(x, net->xfrm.state_bydst + i, bydst) 2287 xfrm_dev_state_update_stats(x); 2288 } 2289 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2290 } 2291 2292 struct xfrm_state * 2293 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 2294 u8 proto, unsigned short family) 2295 { 2296 struct xfrm_hash_state_ptrs state_ptrs; 2297 struct xfrm_state *x; 2298 2299 rcu_read_lock(); 2300 xfrm_hash_ptrs_get(net, &state_ptrs); 2301 2302 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 2303 rcu_read_unlock(); 2304 return x; 2305 } 2306 EXPORT_SYMBOL(xfrm_state_lookup); 2307 2308 struct xfrm_state * 2309 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 2310 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 2311 u8 proto, unsigned short family) 2312 { 2313 struct xfrm_hash_state_ptrs state_ptrs; 2314 struct xfrm_state *x; 2315 2316 rcu_read_lock(); 2317 2318 xfrm_hash_ptrs_get(net, &state_ptrs); 2319 2320 x = __xfrm_state_lookup_byaddr(&state_ptrs, mark, daddr, saddr, proto, family); 2321 rcu_read_unlock(); 2322 return x; 2323 } 2324 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 2325 2326 struct xfrm_state * 2327 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 2328 u32 if_id, u32 pcpu_num, u8 proto, const xfrm_address_t *daddr, 2329 const xfrm_address_t *saddr, int create, unsigned short family) 2330 { 2331 struct xfrm_state *x; 2332 2333 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2334 x = __find_acq_core(net, mark, family, mode, reqid, if_id, pcpu_num, 2335 proto, daddr, saddr, create); 2336 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2337 2338 return x; 2339 } 2340 EXPORT_SYMBOL(xfrm_find_acq); 2341 2342 #ifdef CONFIG_XFRM_SUB_POLICY 2343 #if IS_ENABLED(CONFIG_IPV6) 2344 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 2345 static void 2346 __xfrm6_sort(void **dst, void **src, int n, 2347 int (*cmp)(const void *p), int maxclass) 2348 { 2349 int count[XFRM_MAX_DEPTH] = { }; 2350 int class[XFRM_MAX_DEPTH]; 2351 int i; 2352 2353 for (i = 0; i < n; i++) { 2354 int c = cmp(src[i]); 2355 2356 class[i] = c; 2357 count[c]++; 2358 } 2359 2360 for (i = 2; i < maxclass; i++) 2361 count[i] += count[i - 1]; 2362 2363 for (i = 0; i < n; i++) { 2364 dst[count[class[i] - 1]++] = src[i]; 2365 src[i] = NULL; 2366 } 2367 } 2368 2369 /* Rule for xfrm_state: 2370 * 2371 * rule 1: select IPsec transport except AH 2372 * rule 2: select MIPv6 RO or inbound trigger 2373 * rule 3: select IPsec transport AH 2374 * rule 4: select IPsec tunnel 2375 * rule 5: others 2376 */ 2377 static int __xfrm6_state_sort_cmp(const void *p) 2378 { 2379 const struct xfrm_state *v = p; 2380 2381 switch (v->props.mode) { 2382 case XFRM_MODE_TRANSPORT: 2383 if (v->id.proto != IPPROTO_AH) 2384 return 1; 2385 else 2386 return 3; 2387 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2388 case XFRM_MODE_ROUTEOPTIMIZATION: 2389 case XFRM_MODE_IN_TRIGGER: 2390 return 2; 2391 #endif 2392 case XFRM_MODE_TUNNEL: 2393 case XFRM_MODE_BEET: 2394 case XFRM_MODE_IPTFS: 2395 return 4; 2396 } 2397 return 5; 2398 } 2399 2400 /* Rule for xfrm_tmpl: 2401 * 2402 * rule 1: select IPsec transport 2403 * rule 2: select MIPv6 RO or inbound trigger 2404 * rule 3: select IPsec tunnel 2405 * rule 4: others 2406 */ 2407 static int __xfrm6_tmpl_sort_cmp(const void *p) 2408 { 2409 const struct xfrm_tmpl *v = p; 2410 2411 switch (v->mode) { 2412 case XFRM_MODE_TRANSPORT: 2413 return 1; 2414 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2415 case XFRM_MODE_ROUTEOPTIMIZATION: 2416 case XFRM_MODE_IN_TRIGGER: 2417 return 2; 2418 #endif 2419 case XFRM_MODE_TUNNEL: 2420 case XFRM_MODE_BEET: 2421 case XFRM_MODE_IPTFS: 2422 return 3; 2423 } 2424 return 4; 2425 } 2426 #else 2427 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } 2428 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } 2429 2430 static inline void 2431 __xfrm6_sort(void **dst, void **src, int n, 2432 int (*cmp)(const void *p), int maxclass) 2433 { 2434 int i; 2435 2436 for (i = 0; i < n; i++) 2437 dst[i] = src[i]; 2438 } 2439 #endif /* CONFIG_IPV6 */ 2440 2441 void 2442 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 2443 unsigned short family) 2444 { 2445 int i; 2446 2447 if (family == AF_INET6) 2448 __xfrm6_sort((void **)dst, (void **)src, n, 2449 __xfrm6_tmpl_sort_cmp, 5); 2450 else 2451 for (i = 0; i < n; i++) 2452 dst[i] = src[i]; 2453 } 2454 2455 void 2456 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 2457 unsigned short family) 2458 { 2459 int i; 2460 2461 if (family == AF_INET6) 2462 __xfrm6_sort((void **)dst, (void **)src, n, 2463 __xfrm6_state_sort_cmp, 6); 2464 else 2465 for (i = 0; i < n; i++) 2466 dst[i] = src[i]; 2467 } 2468 #endif 2469 2470 /* Silly enough, but I'm lazy to build resolution list */ 2471 2472 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2473 { 2474 unsigned int h = xfrm_seq_hash(net, seq); 2475 struct xfrm_state *x; 2476 2477 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) { 2478 if (x->km.seq == seq && 2479 (mark & x->mark.m) == x->mark.v && 2480 x->pcpu_num == pcpu_num && 2481 x->km.state == XFRM_STATE_ACQ) { 2482 xfrm_state_hold(x); 2483 return x; 2484 } 2485 } 2486 2487 return NULL; 2488 } 2489 2490 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2491 { 2492 struct xfrm_state *x; 2493 2494 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2495 x = __xfrm_find_acq_byseq(net, mark, seq, pcpu_num); 2496 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2497 return x; 2498 } 2499 EXPORT_SYMBOL(xfrm_find_acq_byseq); 2500 2501 u32 xfrm_get_acqseq(void) 2502 { 2503 u32 res; 2504 static atomic_t acqseq; 2505 2506 do { 2507 res = atomic_inc_return(&acqseq); 2508 } while (!res); 2509 2510 return res; 2511 } 2512 EXPORT_SYMBOL(xfrm_get_acqseq); 2513 2514 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack) 2515 { 2516 switch (proto) { 2517 case IPPROTO_AH: 2518 case IPPROTO_ESP: 2519 break; 2520 2521 case IPPROTO_COMP: 2522 /* IPCOMP spi is 16-bits. */ 2523 if (max >= 0x10000) { 2524 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535"); 2525 return -EINVAL; 2526 } 2527 break; 2528 2529 default: 2530 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP"); 2531 return -EINVAL; 2532 } 2533 2534 if (min > max) { 2535 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max"); 2536 return -EINVAL; 2537 } 2538 2539 return 0; 2540 } 2541 EXPORT_SYMBOL(verify_spi_info); 2542 2543 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high, 2544 struct netlink_ext_ack *extack) 2545 { 2546 struct net *net = xs_net(x); 2547 unsigned int h; 2548 struct xfrm_state *x0; 2549 int err = -ENOENT; 2550 __be32 minspi = htonl(low); 2551 __be32 maxspi = htonl(high); 2552 __be32 newspi = 0; 2553 u32 mark = x->mark.v & x->mark.m; 2554 2555 spin_lock_bh(&x->lock); 2556 if (x->km.state == XFRM_STATE_DEAD) { 2557 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state"); 2558 goto unlock; 2559 } 2560 2561 err = 0; 2562 if (x->id.spi) 2563 goto unlock; 2564 2565 err = -ENOENT; 2566 2567 if (minspi == maxspi) { 2568 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 2569 if (x0) { 2570 NL_SET_ERR_MSG(extack, "Requested SPI is already in use"); 2571 xfrm_state_put(x0); 2572 goto unlock; 2573 } 2574 newspi = minspi; 2575 } else { 2576 u32 spi = 0; 2577 for (h = 0; h < high-low+1; h++) { 2578 spi = get_random_u32_inclusive(low, high); 2579 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 2580 if (x0 == NULL) { 2581 newspi = htonl(spi); 2582 break; 2583 } 2584 xfrm_state_put(x0); 2585 } 2586 } 2587 if (newspi) { 2588 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2589 x->id.spi = newspi; 2590 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 2591 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h, 2592 x->xso.type); 2593 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2594 2595 err = 0; 2596 } else { 2597 NL_SET_ERR_MSG(extack, "No SPI available in the requested range"); 2598 } 2599 2600 unlock: 2601 spin_unlock_bh(&x->lock); 2602 2603 return err; 2604 } 2605 EXPORT_SYMBOL(xfrm_alloc_spi); 2606 2607 static bool __xfrm_state_filter_match(struct xfrm_state *x, 2608 struct xfrm_address_filter *filter) 2609 { 2610 if (filter) { 2611 if ((filter->family == AF_INET || 2612 filter->family == AF_INET6) && 2613 x->props.family != filter->family) 2614 return false; 2615 2616 return addr_match(&x->props.saddr, &filter->saddr, 2617 filter->splen) && 2618 addr_match(&x->id.daddr, &filter->daddr, 2619 filter->dplen); 2620 } 2621 return true; 2622 } 2623 2624 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 2625 int (*func)(struct xfrm_state *, int, void*), 2626 void *data) 2627 { 2628 struct xfrm_state *state; 2629 struct xfrm_state_walk *x; 2630 int err = 0; 2631 2632 if (walk->seq != 0 && list_empty(&walk->all)) 2633 return 0; 2634 2635 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2636 if (list_empty(&walk->all)) 2637 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 2638 else 2639 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 2640 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 2641 if (x->state == XFRM_STATE_DEAD) 2642 continue; 2643 state = container_of(x, struct xfrm_state, km); 2644 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 2645 continue; 2646 if (!__xfrm_state_filter_match(state, walk->filter)) 2647 continue; 2648 err = func(state, walk->seq, data); 2649 if (err) { 2650 list_move_tail(&walk->all, &x->all); 2651 goto out; 2652 } 2653 walk->seq++; 2654 } 2655 if (walk->seq == 0) { 2656 err = -ENOENT; 2657 goto out; 2658 } 2659 list_del_init(&walk->all); 2660 out: 2661 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2662 return err; 2663 } 2664 EXPORT_SYMBOL(xfrm_state_walk); 2665 2666 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 2667 struct xfrm_address_filter *filter) 2668 { 2669 INIT_LIST_HEAD(&walk->all); 2670 walk->proto = proto; 2671 walk->state = XFRM_STATE_DEAD; 2672 walk->seq = 0; 2673 walk->filter = filter; 2674 } 2675 EXPORT_SYMBOL(xfrm_state_walk_init); 2676 2677 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 2678 { 2679 kfree(walk->filter); 2680 2681 if (list_empty(&walk->all)) 2682 return; 2683 2684 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2685 list_del(&walk->all); 2686 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2687 } 2688 EXPORT_SYMBOL(xfrm_state_walk_done); 2689 2690 static void xfrm_replay_timer_handler(struct timer_list *t) 2691 { 2692 struct xfrm_state *x = from_timer(x, t, rtimer); 2693 2694 spin_lock(&x->lock); 2695 2696 if (x->km.state == XFRM_STATE_VALID) { 2697 if (xfrm_aevent_is_on(xs_net(x))) 2698 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); 2699 else 2700 x->xflags |= XFRM_TIME_DEFER; 2701 } 2702 2703 spin_unlock(&x->lock); 2704 } 2705 2706 static LIST_HEAD(xfrm_km_list); 2707 2708 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2709 { 2710 struct xfrm_mgr *km; 2711 2712 rcu_read_lock(); 2713 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2714 if (km->notify_policy) 2715 km->notify_policy(xp, dir, c); 2716 rcu_read_unlock(); 2717 } 2718 2719 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 2720 { 2721 struct xfrm_mgr *km; 2722 rcu_read_lock(); 2723 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2724 if (km->notify) 2725 km->notify(x, c); 2726 rcu_read_unlock(); 2727 } 2728 2729 EXPORT_SYMBOL(km_policy_notify); 2730 EXPORT_SYMBOL(km_state_notify); 2731 2732 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 2733 { 2734 struct km_event c; 2735 2736 c.data.hard = hard; 2737 c.portid = portid; 2738 c.event = XFRM_MSG_EXPIRE; 2739 km_state_notify(x, &c); 2740 } 2741 2742 EXPORT_SYMBOL(km_state_expired); 2743 /* 2744 * We send to all registered managers regardless of failure 2745 * We are happy with one success 2746 */ 2747 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 2748 { 2749 int err = -EINVAL, acqret; 2750 struct xfrm_mgr *km; 2751 2752 rcu_read_lock(); 2753 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2754 acqret = km->acquire(x, t, pol); 2755 if (!acqret) 2756 err = acqret; 2757 } 2758 rcu_read_unlock(); 2759 return err; 2760 } 2761 EXPORT_SYMBOL(km_query); 2762 2763 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2764 { 2765 int err = -EINVAL; 2766 struct xfrm_mgr *km; 2767 2768 rcu_read_lock(); 2769 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2770 if (km->new_mapping) 2771 err = km->new_mapping(x, ipaddr, sport); 2772 if (!err) 2773 break; 2774 } 2775 rcu_read_unlock(); 2776 return err; 2777 } 2778 2779 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2780 { 2781 int ret = 0; 2782 2783 if (x->mapping_maxage) { 2784 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage || 2785 x->new_mapping_sport != sport) { 2786 x->new_mapping_sport = sport; 2787 x->new_mapping = jiffies / HZ; 2788 ret = __km_new_mapping(x, ipaddr, sport); 2789 } 2790 } else { 2791 ret = __km_new_mapping(x, ipaddr, sport); 2792 } 2793 2794 return ret; 2795 } 2796 EXPORT_SYMBOL(km_new_mapping); 2797 2798 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2799 { 2800 struct km_event c; 2801 2802 c.data.hard = hard; 2803 c.portid = portid; 2804 c.event = XFRM_MSG_POLEXPIRE; 2805 km_policy_notify(pol, dir, &c); 2806 } 2807 EXPORT_SYMBOL(km_policy_expired); 2808 2809 #ifdef CONFIG_XFRM_MIGRATE 2810 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2811 const struct xfrm_migrate *m, int num_migrate, 2812 const struct xfrm_kmaddress *k, 2813 const struct xfrm_encap_tmpl *encap) 2814 { 2815 int err = -EINVAL; 2816 int ret; 2817 struct xfrm_mgr *km; 2818 2819 rcu_read_lock(); 2820 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2821 if (km->migrate) { 2822 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2823 encap); 2824 if (!ret) 2825 err = ret; 2826 } 2827 } 2828 rcu_read_unlock(); 2829 return err; 2830 } 2831 EXPORT_SYMBOL(km_migrate); 2832 #endif 2833 2834 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2835 { 2836 int err = -EINVAL; 2837 int ret; 2838 struct xfrm_mgr *km; 2839 2840 rcu_read_lock(); 2841 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2842 if (km->report) { 2843 ret = km->report(net, proto, sel, addr); 2844 if (!ret) 2845 err = ret; 2846 } 2847 } 2848 rcu_read_unlock(); 2849 return err; 2850 } 2851 EXPORT_SYMBOL(km_report); 2852 2853 static bool km_is_alive(const struct km_event *c) 2854 { 2855 struct xfrm_mgr *km; 2856 bool is_alive = false; 2857 2858 rcu_read_lock(); 2859 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2860 if (km->is_alive && km->is_alive(c)) { 2861 is_alive = true; 2862 break; 2863 } 2864 } 2865 rcu_read_unlock(); 2866 2867 return is_alive; 2868 } 2869 2870 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2871 static DEFINE_SPINLOCK(xfrm_translator_lock); 2872 static struct xfrm_translator __rcu *xfrm_translator; 2873 2874 struct xfrm_translator *xfrm_get_translator(void) 2875 { 2876 struct xfrm_translator *xtr; 2877 2878 rcu_read_lock(); 2879 xtr = rcu_dereference(xfrm_translator); 2880 if (unlikely(!xtr)) 2881 goto out; 2882 if (!try_module_get(xtr->owner)) 2883 xtr = NULL; 2884 out: 2885 rcu_read_unlock(); 2886 return xtr; 2887 } 2888 EXPORT_SYMBOL_GPL(xfrm_get_translator); 2889 2890 void xfrm_put_translator(struct xfrm_translator *xtr) 2891 { 2892 module_put(xtr->owner); 2893 } 2894 EXPORT_SYMBOL_GPL(xfrm_put_translator); 2895 2896 int xfrm_register_translator(struct xfrm_translator *xtr) 2897 { 2898 int err = 0; 2899 2900 spin_lock_bh(&xfrm_translator_lock); 2901 if (unlikely(xfrm_translator != NULL)) 2902 err = -EEXIST; 2903 else 2904 rcu_assign_pointer(xfrm_translator, xtr); 2905 spin_unlock_bh(&xfrm_translator_lock); 2906 2907 return err; 2908 } 2909 EXPORT_SYMBOL_GPL(xfrm_register_translator); 2910 2911 int xfrm_unregister_translator(struct xfrm_translator *xtr) 2912 { 2913 int err = 0; 2914 2915 spin_lock_bh(&xfrm_translator_lock); 2916 if (likely(xfrm_translator != NULL)) { 2917 if (rcu_access_pointer(xfrm_translator) != xtr) 2918 err = -EINVAL; 2919 else 2920 RCU_INIT_POINTER(xfrm_translator, NULL); 2921 } 2922 spin_unlock_bh(&xfrm_translator_lock); 2923 synchronize_rcu(); 2924 2925 return err; 2926 } 2927 EXPORT_SYMBOL_GPL(xfrm_unregister_translator); 2928 #endif 2929 2930 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen) 2931 { 2932 int err; 2933 u8 *data; 2934 struct xfrm_mgr *km; 2935 struct xfrm_policy *pol = NULL; 2936 2937 if (sockptr_is_null(optval) && !optlen) { 2938 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2939 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2940 __sk_dst_reset(sk); 2941 return 0; 2942 } 2943 2944 if (optlen <= 0 || optlen > PAGE_SIZE) 2945 return -EMSGSIZE; 2946 2947 data = memdup_sockptr(optval, optlen); 2948 if (IS_ERR(data)) 2949 return PTR_ERR(data); 2950 2951 if (in_compat_syscall()) { 2952 struct xfrm_translator *xtr = xfrm_get_translator(); 2953 2954 if (!xtr) { 2955 kfree(data); 2956 return -EOPNOTSUPP; 2957 } 2958 2959 err = xtr->xlate_user_policy_sockptr(&data, optlen); 2960 xfrm_put_translator(xtr); 2961 if (err) { 2962 kfree(data); 2963 return err; 2964 } 2965 } 2966 2967 err = -EINVAL; 2968 rcu_read_lock(); 2969 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2970 pol = km->compile_policy(sk, optname, data, 2971 optlen, &err); 2972 if (err >= 0) 2973 break; 2974 } 2975 rcu_read_unlock(); 2976 2977 if (err >= 0) { 2978 xfrm_sk_policy_insert(sk, err, pol); 2979 xfrm_pol_put(pol); 2980 __sk_dst_reset(sk); 2981 err = 0; 2982 } 2983 2984 kfree(data); 2985 return err; 2986 } 2987 EXPORT_SYMBOL(xfrm_user_policy); 2988 2989 static DEFINE_SPINLOCK(xfrm_km_lock); 2990 2991 void xfrm_register_km(struct xfrm_mgr *km) 2992 { 2993 spin_lock_bh(&xfrm_km_lock); 2994 list_add_tail_rcu(&km->list, &xfrm_km_list); 2995 spin_unlock_bh(&xfrm_km_lock); 2996 } 2997 EXPORT_SYMBOL(xfrm_register_km); 2998 2999 void xfrm_unregister_km(struct xfrm_mgr *km) 3000 { 3001 spin_lock_bh(&xfrm_km_lock); 3002 list_del_rcu(&km->list); 3003 spin_unlock_bh(&xfrm_km_lock); 3004 synchronize_rcu(); 3005 } 3006 EXPORT_SYMBOL(xfrm_unregister_km); 3007 3008 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 3009 { 3010 int err = 0; 3011 3012 if (WARN_ON(afinfo->family >= NPROTO)) 3013 return -EAFNOSUPPORT; 3014 3015 spin_lock_bh(&xfrm_state_afinfo_lock); 3016 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 3017 err = -EEXIST; 3018 else 3019 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 3020 spin_unlock_bh(&xfrm_state_afinfo_lock); 3021 return err; 3022 } 3023 EXPORT_SYMBOL(xfrm_state_register_afinfo); 3024 3025 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 3026 { 3027 int err = 0, family = afinfo->family; 3028 3029 if (WARN_ON(family >= NPROTO)) 3030 return -EAFNOSUPPORT; 3031 3032 spin_lock_bh(&xfrm_state_afinfo_lock); 3033 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 3034 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 3035 err = -EINVAL; 3036 else 3037 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 3038 } 3039 spin_unlock_bh(&xfrm_state_afinfo_lock); 3040 synchronize_rcu(); 3041 return err; 3042 } 3043 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 3044 3045 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 3046 { 3047 if (unlikely(family >= NPROTO)) 3048 return NULL; 3049 3050 return rcu_dereference(xfrm_state_afinfo[family]); 3051 } 3052 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); 3053 3054 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 3055 { 3056 struct xfrm_state_afinfo *afinfo; 3057 if (unlikely(family >= NPROTO)) 3058 return NULL; 3059 rcu_read_lock(); 3060 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 3061 if (unlikely(!afinfo)) 3062 rcu_read_unlock(); 3063 return afinfo; 3064 } 3065 3066 void xfrm_flush_gc(void) 3067 { 3068 flush_work(&xfrm_state_gc_work); 3069 } 3070 EXPORT_SYMBOL(xfrm_flush_gc); 3071 3072 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 3073 void xfrm_state_delete_tunnel(struct xfrm_state *x) 3074 { 3075 if (x->tunnel) { 3076 struct xfrm_state *t = x->tunnel; 3077 3078 if (atomic_read(&t->tunnel_users) == 2) 3079 xfrm_state_delete(t); 3080 atomic_dec(&t->tunnel_users); 3081 xfrm_state_put_sync(t); 3082 x->tunnel = NULL; 3083 } 3084 } 3085 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 3086 3087 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) 3088 { 3089 const struct xfrm_type *type = READ_ONCE(x->type); 3090 struct crypto_aead *aead; 3091 u32 blksize, net_adj = 0; 3092 3093 if (x->km.state != XFRM_STATE_VALID || 3094 !type || type->proto != IPPROTO_ESP) 3095 return mtu - x->props.header_len; 3096 3097 aead = x->data; 3098 blksize = ALIGN(crypto_aead_blocksize(aead), 4); 3099 3100 switch (x->props.mode) { 3101 case XFRM_MODE_TRANSPORT: 3102 case XFRM_MODE_BEET: 3103 if (x->props.family == AF_INET) 3104 net_adj = sizeof(struct iphdr); 3105 else if (x->props.family == AF_INET6) 3106 net_adj = sizeof(struct ipv6hdr); 3107 break; 3108 case XFRM_MODE_TUNNEL: 3109 break; 3110 default: 3111 if (x->mode_cbs && x->mode_cbs->get_inner_mtu) 3112 return x->mode_cbs->get_inner_mtu(x, mtu); 3113 3114 WARN_ON_ONCE(1); 3115 break; 3116 } 3117 3118 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - 3119 net_adj) & ~(blksize - 1)) + net_adj - 2; 3120 } 3121 EXPORT_SYMBOL_GPL(xfrm_state_mtu); 3122 3123 int __xfrm_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) 3124 { 3125 const struct xfrm_mode *inner_mode; 3126 const struct xfrm_mode *outer_mode; 3127 int family = x->props.family; 3128 int err; 3129 3130 if (family == AF_INET && 3131 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)) 3132 x->props.flags |= XFRM_STATE_NOPMTUDISC; 3133 3134 err = -EPROTONOSUPPORT; 3135 3136 if (x->sel.family != AF_UNSPEC) { 3137 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 3138 if (inner_mode == NULL) { 3139 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3140 goto error; 3141 } 3142 3143 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 3144 family != x->sel.family) { 3145 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family"); 3146 goto error; 3147 } 3148 3149 x->inner_mode = *inner_mode; 3150 } else { 3151 const struct xfrm_mode *inner_mode_iaf; 3152 int iafamily = AF_INET; 3153 3154 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 3155 if (inner_mode == NULL) { 3156 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3157 goto error; 3158 } 3159 3160 x->inner_mode = *inner_mode; 3161 3162 if (x->props.family == AF_INET) 3163 iafamily = AF_INET6; 3164 3165 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 3166 if (inner_mode_iaf) { 3167 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 3168 x->inner_mode_iaf = *inner_mode_iaf; 3169 } 3170 } 3171 3172 x->type = xfrm_get_type(x->id.proto, family); 3173 if (x->type == NULL) { 3174 NL_SET_ERR_MSG(extack, "Requested type not found"); 3175 goto error; 3176 } 3177 3178 err = x->type->init_state(x, extack); 3179 if (err) 3180 goto error; 3181 3182 outer_mode = xfrm_get_mode(x->props.mode, family); 3183 if (!outer_mode) { 3184 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3185 err = -EPROTONOSUPPORT; 3186 goto error; 3187 } 3188 3189 x->outer_mode = *outer_mode; 3190 if (x->nat_keepalive_interval) { 3191 if (x->dir != XFRM_SA_DIR_OUT) { 3192 NL_SET_ERR_MSG(extack, "NAT keepalive is only supported for outbound SAs"); 3193 err = -EINVAL; 3194 goto error; 3195 } 3196 3197 if (!x->encap || x->encap->encap_type != UDP_ENCAP_ESPINUDP) { 3198 NL_SET_ERR_MSG(extack, 3199 "NAT keepalive is only supported for UDP encapsulation"); 3200 err = -EINVAL; 3201 goto error; 3202 } 3203 } 3204 3205 x->mode_cbs = xfrm_get_mode_cbs(x->props.mode); 3206 if (x->mode_cbs) { 3207 if (x->mode_cbs->init_state) 3208 err = x->mode_cbs->init_state(x); 3209 module_put(x->mode_cbs->owner); 3210 } 3211 error: 3212 return err; 3213 } 3214 3215 EXPORT_SYMBOL(__xfrm_init_state); 3216 3217 int xfrm_init_state(struct xfrm_state *x) 3218 { 3219 int err; 3220 3221 err = __xfrm_init_state(x, NULL); 3222 if (err) 3223 return err; 3224 3225 err = xfrm_init_replay(x, NULL); 3226 if (err) 3227 return err; 3228 3229 x->km.state = XFRM_STATE_VALID; 3230 return 0; 3231 } 3232 3233 EXPORT_SYMBOL(xfrm_init_state); 3234 3235 int __net_init xfrm_state_init(struct net *net) 3236 { 3237 unsigned int sz; 3238 3239 if (net_eq(net, &init_net)) 3240 xfrm_state_cache = KMEM_CACHE(xfrm_state, 3241 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 3242 3243 INIT_LIST_HEAD(&net->xfrm.state_all); 3244 3245 sz = sizeof(struct hlist_head) * 8; 3246 3247 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 3248 if (!net->xfrm.state_bydst) 3249 goto out_bydst; 3250 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 3251 if (!net->xfrm.state_bysrc) 3252 goto out_bysrc; 3253 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 3254 if (!net->xfrm.state_byspi) 3255 goto out_byspi; 3256 net->xfrm.state_byseq = xfrm_hash_alloc(sz); 3257 if (!net->xfrm.state_byseq) 3258 goto out_byseq; 3259 3260 net->xfrm.state_cache_input = alloc_percpu(struct hlist_head); 3261 if (!net->xfrm.state_cache_input) 3262 goto out_state_cache_input; 3263 3264 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 3265 3266 net->xfrm.state_num = 0; 3267 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 3268 spin_lock_init(&net->xfrm.xfrm_state_lock); 3269 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation, 3270 &net->xfrm.xfrm_state_lock); 3271 return 0; 3272 3273 out_state_cache_input: 3274 xfrm_hash_free(net->xfrm.state_byseq, sz); 3275 out_byseq: 3276 xfrm_hash_free(net->xfrm.state_byspi, sz); 3277 out_byspi: 3278 xfrm_hash_free(net->xfrm.state_bysrc, sz); 3279 out_bysrc: 3280 xfrm_hash_free(net->xfrm.state_bydst, sz); 3281 out_bydst: 3282 return -ENOMEM; 3283 } 3284 3285 void xfrm_state_fini(struct net *net) 3286 { 3287 unsigned int sz; 3288 3289 flush_work(&net->xfrm.state_hash_work); 3290 flush_work(&xfrm_state_gc_work); 3291 xfrm_state_flush(net, 0, false, true); 3292 3293 WARN_ON(!list_empty(&net->xfrm.state_all)); 3294 3295 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 3296 WARN_ON(!hlist_empty(net->xfrm.state_byseq)); 3297 xfrm_hash_free(net->xfrm.state_byseq, sz); 3298 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 3299 xfrm_hash_free(net->xfrm.state_byspi, sz); 3300 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 3301 xfrm_hash_free(net->xfrm.state_bysrc, sz); 3302 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 3303 xfrm_hash_free(net->xfrm.state_bydst, sz); 3304 free_percpu(net->xfrm.state_cache_input); 3305 } 3306 3307 #ifdef CONFIG_AUDITSYSCALL 3308 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 3309 struct audit_buffer *audit_buf) 3310 { 3311 struct xfrm_sec_ctx *ctx = x->security; 3312 u32 spi = ntohl(x->id.spi); 3313 3314 if (ctx) 3315 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 3316 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 3317 3318 switch (x->props.family) { 3319 case AF_INET: 3320 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3321 &x->props.saddr.a4, &x->id.daddr.a4); 3322 break; 3323 case AF_INET6: 3324 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 3325 x->props.saddr.a6, x->id.daddr.a6); 3326 break; 3327 } 3328 3329 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3330 } 3331 3332 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 3333 struct audit_buffer *audit_buf) 3334 { 3335 const struct iphdr *iph4; 3336 const struct ipv6hdr *iph6; 3337 3338 switch (family) { 3339 case AF_INET: 3340 iph4 = ip_hdr(skb); 3341 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3342 &iph4->saddr, &iph4->daddr); 3343 break; 3344 case AF_INET6: 3345 iph6 = ipv6_hdr(skb); 3346 audit_log_format(audit_buf, 3347 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 3348 &iph6->saddr, &iph6->daddr, 3349 iph6->flow_lbl[0] & 0x0f, 3350 iph6->flow_lbl[1], 3351 iph6->flow_lbl[2]); 3352 break; 3353 } 3354 } 3355 3356 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 3357 { 3358 struct audit_buffer *audit_buf; 3359 3360 audit_buf = xfrm_audit_start("SAD-add"); 3361 if (audit_buf == NULL) 3362 return; 3363 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3364 xfrm_audit_helper_sainfo(x, audit_buf); 3365 audit_log_format(audit_buf, " res=%u", result); 3366 audit_log_end(audit_buf); 3367 } 3368 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 3369 3370 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 3371 { 3372 struct audit_buffer *audit_buf; 3373 3374 audit_buf = xfrm_audit_start("SAD-delete"); 3375 if (audit_buf == NULL) 3376 return; 3377 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3378 xfrm_audit_helper_sainfo(x, audit_buf); 3379 audit_log_format(audit_buf, " res=%u", result); 3380 audit_log_end(audit_buf); 3381 } 3382 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 3383 3384 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 3385 struct sk_buff *skb) 3386 { 3387 struct audit_buffer *audit_buf; 3388 u32 spi; 3389 3390 audit_buf = xfrm_audit_start("SA-replay-overflow"); 3391 if (audit_buf == NULL) 3392 return; 3393 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3394 /* don't record the sequence number because it's inherent in this kind 3395 * of audit message */ 3396 spi = ntohl(x->id.spi); 3397 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3398 audit_log_end(audit_buf); 3399 } 3400 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 3401 3402 void xfrm_audit_state_replay(struct xfrm_state *x, 3403 struct sk_buff *skb, __be32 net_seq) 3404 { 3405 struct audit_buffer *audit_buf; 3406 u32 spi; 3407 3408 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 3409 if (audit_buf == NULL) 3410 return; 3411 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3412 spi = ntohl(x->id.spi); 3413 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3414 spi, spi, ntohl(net_seq)); 3415 audit_log_end(audit_buf); 3416 } 3417 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 3418 3419 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 3420 { 3421 struct audit_buffer *audit_buf; 3422 3423 audit_buf = xfrm_audit_start("SA-notfound"); 3424 if (audit_buf == NULL) 3425 return; 3426 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3427 audit_log_end(audit_buf); 3428 } 3429 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 3430 3431 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 3432 __be32 net_spi, __be32 net_seq) 3433 { 3434 struct audit_buffer *audit_buf; 3435 u32 spi; 3436 3437 audit_buf = xfrm_audit_start("SA-notfound"); 3438 if (audit_buf == NULL) 3439 return; 3440 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3441 spi = ntohl(net_spi); 3442 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3443 spi, spi, ntohl(net_seq)); 3444 audit_log_end(audit_buf); 3445 } 3446 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 3447 3448 void xfrm_audit_state_icvfail(struct xfrm_state *x, 3449 struct sk_buff *skb, u8 proto) 3450 { 3451 struct audit_buffer *audit_buf; 3452 __be32 net_spi; 3453 __be32 net_seq; 3454 3455 audit_buf = xfrm_audit_start("SA-icv-failure"); 3456 if (audit_buf == NULL) 3457 return; 3458 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3459 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 3460 u32 spi = ntohl(net_spi); 3461 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3462 spi, spi, ntohl(net_seq)); 3463 } 3464 audit_log_end(audit_buf); 3465 } 3466 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 3467 #endif /* CONFIG_AUDITSYSCALL */ 3468