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 *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, bool try_load) 428 { 429 const struct xfrm_type_offload *type = NULL; 430 struct xfrm_state_afinfo *afinfo; 431 432 retry: 433 afinfo = xfrm_state_get_afinfo(x->props.family); 434 if (unlikely(afinfo == NULL)) 435 goto out; 436 437 switch (x->id.proto) { 438 case IPPROTO_ESP: 439 type = afinfo->type_offload_esp; 440 break; 441 default: 442 break; 443 } 444 445 if ((type && !try_module_get(type->owner))) 446 type = NULL; 447 448 rcu_read_unlock(); 449 450 if (!type && try_load) { 451 request_module("xfrm-offload-%d-%d", x->props.family, 452 x->id.proto); 453 try_load = false; 454 goto retry; 455 } 456 457 out: 458 x->type_offload = type; 459 } 460 EXPORT_SYMBOL(xfrm_set_type_offload); 461 462 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = { 463 [XFRM_MODE_BEET] = { 464 .encap = XFRM_MODE_BEET, 465 .flags = XFRM_MODE_FLAG_TUNNEL, 466 .family = AF_INET, 467 }, 468 [XFRM_MODE_TRANSPORT] = { 469 .encap = XFRM_MODE_TRANSPORT, 470 .family = AF_INET, 471 }, 472 [XFRM_MODE_TUNNEL] = { 473 .encap = XFRM_MODE_TUNNEL, 474 .flags = XFRM_MODE_FLAG_TUNNEL, 475 .family = AF_INET, 476 }, 477 [XFRM_MODE_IPTFS] = { 478 .encap = XFRM_MODE_IPTFS, 479 .flags = XFRM_MODE_FLAG_TUNNEL, 480 .family = AF_INET, 481 }, 482 }; 483 484 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = { 485 [XFRM_MODE_BEET] = { 486 .encap = XFRM_MODE_BEET, 487 .flags = XFRM_MODE_FLAG_TUNNEL, 488 .family = AF_INET6, 489 }, 490 [XFRM_MODE_ROUTEOPTIMIZATION] = { 491 .encap = XFRM_MODE_ROUTEOPTIMIZATION, 492 .family = AF_INET6, 493 }, 494 [XFRM_MODE_TRANSPORT] = { 495 .encap = XFRM_MODE_TRANSPORT, 496 .family = AF_INET6, 497 }, 498 [XFRM_MODE_TUNNEL] = { 499 .encap = XFRM_MODE_TUNNEL, 500 .flags = XFRM_MODE_FLAG_TUNNEL, 501 .family = AF_INET6, 502 }, 503 [XFRM_MODE_IPTFS] = { 504 .encap = XFRM_MODE_IPTFS, 505 .flags = XFRM_MODE_FLAG_TUNNEL, 506 .family = AF_INET6, 507 }, 508 }; 509 510 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 511 { 512 const struct xfrm_mode *mode; 513 514 if (unlikely(encap >= XFRM_MODE_MAX)) 515 return NULL; 516 517 switch (family) { 518 case AF_INET: 519 mode = &xfrm4_mode_map[encap]; 520 if (mode->family == family) 521 return mode; 522 break; 523 case AF_INET6: 524 mode = &xfrm6_mode_map[encap]; 525 if (mode->family == family) 526 return mode; 527 break; 528 default: 529 break; 530 } 531 532 return NULL; 533 } 534 535 static const struct xfrm_mode_cbs __rcu *xfrm_mode_cbs_map[XFRM_MODE_MAX]; 536 static DEFINE_SPINLOCK(xfrm_mode_cbs_map_lock); 537 538 int xfrm_register_mode_cbs(u8 mode, const struct xfrm_mode_cbs *mode_cbs) 539 { 540 if (mode >= XFRM_MODE_MAX) 541 return -EINVAL; 542 543 spin_lock_bh(&xfrm_mode_cbs_map_lock); 544 rcu_assign_pointer(xfrm_mode_cbs_map[mode], mode_cbs); 545 spin_unlock_bh(&xfrm_mode_cbs_map_lock); 546 547 return 0; 548 } 549 EXPORT_SYMBOL(xfrm_register_mode_cbs); 550 551 void xfrm_unregister_mode_cbs(u8 mode) 552 { 553 if (mode >= XFRM_MODE_MAX) 554 return; 555 556 spin_lock_bh(&xfrm_mode_cbs_map_lock); 557 RCU_INIT_POINTER(xfrm_mode_cbs_map[mode], NULL); 558 spin_unlock_bh(&xfrm_mode_cbs_map_lock); 559 synchronize_rcu(); 560 } 561 EXPORT_SYMBOL(xfrm_unregister_mode_cbs); 562 563 static const struct xfrm_mode_cbs *xfrm_get_mode_cbs(u8 mode) 564 { 565 const struct xfrm_mode_cbs *cbs; 566 bool try_load = true; 567 568 if (mode >= XFRM_MODE_MAX) 569 return NULL; 570 571 retry: 572 rcu_read_lock(); 573 574 cbs = rcu_dereference(xfrm_mode_cbs_map[mode]); 575 if (cbs && !try_module_get(cbs->owner)) 576 cbs = NULL; 577 578 rcu_read_unlock(); 579 580 if (mode == XFRM_MODE_IPTFS && !cbs && try_load) { 581 request_module("xfrm-iptfs"); 582 try_load = false; 583 goto retry; 584 } 585 586 return cbs; 587 } 588 589 void xfrm_state_free(struct xfrm_state *x) 590 { 591 kmem_cache_free(xfrm_state_cache, x); 592 } 593 EXPORT_SYMBOL(xfrm_state_free); 594 595 static void xfrm_state_delete_tunnel(struct xfrm_state *x); 596 static void xfrm_state_gc_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 timer_delete_sync(&x->rtimer); 602 kfree_sensitive(x->aead); 603 kfree_sensitive(x->aalg); 604 kfree_sensitive(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 xfrm_unset_type_offload(x); 611 xfrm_state_delete_tunnel(x); 612 if (x->type) { 613 x->type->destructor(x); 614 xfrm_put_type(x->type); 615 } 616 if (x->xfrag.page) 617 put_page(x->xfrag.page); 618 xfrm_dev_state_free(x); 619 security_xfrm_state_free(x); 620 xfrm_state_free(x); 621 } 622 623 static void xfrm_state_gc_task(struct work_struct *work) 624 { 625 struct xfrm_state *x; 626 struct hlist_node *tmp; 627 struct hlist_head gc_list; 628 629 spin_lock_bh(&xfrm_state_gc_lock); 630 hlist_move_list(&xfrm_state_gc_list, &gc_list); 631 spin_unlock_bh(&xfrm_state_gc_lock); 632 633 synchronize_rcu(); 634 635 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 636 xfrm_state_gc_destroy(x); 637 } 638 639 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 640 { 641 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer); 642 enum hrtimer_restart ret = HRTIMER_NORESTART; 643 time64_t now = ktime_get_real_seconds(); 644 time64_t next = TIME64_MAX; 645 int warn = 0; 646 int err = 0; 647 648 spin_lock(&x->lock); 649 xfrm_dev_state_update_stats(x); 650 651 if (x->km.state == XFRM_STATE_DEAD) 652 goto out; 653 if (x->km.state == XFRM_STATE_EXPIRED) 654 goto expired; 655 if (x->lft.hard_add_expires_seconds) { 656 time64_t tmo = x->lft.hard_add_expires_seconds + 657 x->curlft.add_time - now; 658 if (tmo <= 0) { 659 if (x->xflags & XFRM_SOFT_EXPIRE) { 660 /* enter hard expire without soft expire first?! 661 * setting a new date could trigger this. 662 * workaround: fix x->curflt.add_time by below: 663 */ 664 x->curlft.add_time = now - x->saved_tmo - 1; 665 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 666 } else 667 goto expired; 668 } 669 if (tmo < next) 670 next = tmo; 671 } 672 if (x->lft.hard_use_expires_seconds) { 673 time64_t tmo = x->lft.hard_use_expires_seconds + 674 (READ_ONCE(x->curlft.use_time) ? : now) - now; 675 if (tmo <= 0) 676 goto expired; 677 if (tmo < next) 678 next = tmo; 679 } 680 if (x->km.dying) 681 goto resched; 682 if (x->lft.soft_add_expires_seconds) { 683 time64_t tmo = x->lft.soft_add_expires_seconds + 684 x->curlft.add_time - now; 685 if (tmo <= 0) { 686 warn = 1; 687 x->xflags &= ~XFRM_SOFT_EXPIRE; 688 } else if (tmo < next) { 689 next = tmo; 690 x->xflags |= XFRM_SOFT_EXPIRE; 691 x->saved_tmo = tmo; 692 } 693 } 694 if (x->lft.soft_use_expires_seconds) { 695 time64_t tmo = x->lft.soft_use_expires_seconds + 696 (READ_ONCE(x->curlft.use_time) ? : now) - now; 697 if (tmo <= 0) 698 warn = 1; 699 else if (tmo < next) 700 next = tmo; 701 } 702 703 x->km.dying = warn; 704 if (warn) 705 km_state_expired(x, 0, 0); 706 resched: 707 if (next != TIME64_MAX) { 708 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0)); 709 ret = HRTIMER_RESTART; 710 } 711 712 goto out; 713 714 expired: 715 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 716 x->km.state = XFRM_STATE_EXPIRED; 717 718 err = __xfrm_state_delete(x); 719 if (!err) 720 km_state_expired(x, 1, 0); 721 722 xfrm_audit_state_delete(x, err ? 0 : 1, true); 723 724 out: 725 spin_unlock(&x->lock); 726 return ret; 727 } 728 729 static void xfrm_replay_timer_handler(struct timer_list *t); 730 731 struct xfrm_state *xfrm_state_alloc(struct net *net) 732 { 733 struct xfrm_state *x; 734 735 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC); 736 737 if (x) { 738 write_pnet(&x->xs_net, net); 739 refcount_set(&x->refcnt, 1); 740 atomic_set(&x->tunnel_users, 0); 741 INIT_LIST_HEAD(&x->km.all); 742 INIT_HLIST_NODE(&x->state_cache); 743 INIT_HLIST_NODE(&x->bydst); 744 INIT_HLIST_NODE(&x->bysrc); 745 INIT_HLIST_NODE(&x->byspi); 746 INIT_HLIST_NODE(&x->byseq); 747 hrtimer_setup(&x->mtimer, xfrm_timer_handler, CLOCK_BOOTTIME, 748 HRTIMER_MODE_ABS_SOFT); 749 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 750 x->curlft.add_time = ktime_get_real_seconds(); 751 x->lft.soft_byte_limit = XFRM_INF; 752 x->lft.soft_packet_limit = XFRM_INF; 753 x->lft.hard_byte_limit = XFRM_INF; 754 x->lft.hard_packet_limit = XFRM_INF; 755 x->replay_maxage = 0; 756 x->replay_maxdiff = 0; 757 x->pcpu_num = UINT_MAX; 758 spin_lock_init(&x->lock); 759 x->mode_data = NULL; 760 } 761 return x; 762 } 763 EXPORT_SYMBOL(xfrm_state_alloc); 764 765 #ifdef CONFIG_XFRM_OFFLOAD 766 void xfrm_dev_state_delete(struct xfrm_state *x) 767 { 768 struct xfrm_dev_offload *xso = &x->xso; 769 struct net_device *dev = READ_ONCE(xso->dev); 770 771 if (dev) { 772 dev->xfrmdev_ops->xdo_dev_state_delete(dev, x); 773 spin_lock_bh(&xfrm_state_dev_gc_lock); 774 hlist_add_head(&x->dev_gclist, &xfrm_state_dev_gc_list); 775 spin_unlock_bh(&xfrm_state_dev_gc_lock); 776 } 777 } 778 EXPORT_SYMBOL_GPL(xfrm_dev_state_delete); 779 780 void xfrm_dev_state_free(struct xfrm_state *x) 781 { 782 struct xfrm_dev_offload *xso = &x->xso; 783 struct net_device *dev = READ_ONCE(xso->dev); 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(dev, 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) 801 { 802 WARN_ON(x->km.state != XFRM_STATE_DEAD); 803 804 spin_lock_bh(&xfrm_state_gc_lock); 805 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 806 spin_unlock_bh(&xfrm_state_gc_lock); 807 schedule_work(&xfrm_state_gc_work); 808 } 809 EXPORT_SYMBOL(__xfrm_state_destroy); 810 811 int __xfrm_state_delete(struct xfrm_state *x) 812 { 813 struct net *net = xs_net(x); 814 int err = -ESRCH; 815 816 if (x->km.state != XFRM_STATE_DEAD) { 817 x->km.state = XFRM_STATE_DEAD; 818 819 spin_lock(&net->xfrm.xfrm_state_lock); 820 list_del(&x->km.all); 821 hlist_del_rcu(&x->bydst); 822 hlist_del_rcu(&x->bysrc); 823 if (x->km.seq) 824 hlist_del_rcu(&x->byseq); 825 if (!hlist_unhashed(&x->state_cache)) 826 hlist_del_rcu(&x->state_cache); 827 if (!hlist_unhashed(&x->state_cache_input)) 828 hlist_del_rcu(&x->state_cache_input); 829 830 if (x->id.spi) 831 hlist_del_rcu(&x->byspi); 832 net->xfrm.state_num--; 833 xfrm_nat_keepalive_state_updated(x); 834 spin_unlock(&net->xfrm.xfrm_state_lock); 835 836 xfrm_dev_state_delete(x); 837 838 xfrm_state_delete_tunnel(x); 839 840 /* All xfrm_state objects are created by xfrm_state_alloc. 841 * The xfrm_state_alloc call gives a reference, and that 842 * is what we are dropping here. 843 */ 844 xfrm_state_put(x); 845 err = 0; 846 } 847 848 return err; 849 } 850 EXPORT_SYMBOL(__xfrm_state_delete); 851 852 int xfrm_state_delete(struct xfrm_state *x) 853 { 854 int err; 855 856 spin_lock_bh(&x->lock); 857 err = __xfrm_state_delete(x); 858 spin_unlock_bh(&x->lock); 859 860 return err; 861 } 862 EXPORT_SYMBOL(xfrm_state_delete); 863 864 #ifdef CONFIG_SECURITY_NETWORK_XFRM 865 static inline int 866 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 867 { 868 int i, err = 0; 869 870 for (i = 0; i <= net->xfrm.state_hmask; i++) { 871 struct xfrm_state *x; 872 873 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) { 874 if (xfrm_id_proto_match(x->id.proto, proto) && 875 (err = security_xfrm_state_delete(x)) != 0) { 876 xfrm_audit_state_delete(x, 0, task_valid); 877 return err; 878 } 879 } 880 } 881 882 return err; 883 } 884 885 static inline int 886 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 887 { 888 int i, err = 0; 889 890 for (i = 0; i <= net->xfrm.state_hmask; i++) { 891 struct xfrm_state *x; 892 struct xfrm_dev_offload *xso; 893 894 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) { 895 xso = &x->xso; 896 897 if (xso->dev == dev && 898 (err = security_xfrm_state_delete(x)) != 0) { 899 xfrm_audit_state_delete(x, 0, task_valid); 900 return err; 901 } 902 } 903 } 904 905 return err; 906 } 907 #else 908 static inline int 909 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 910 { 911 return 0; 912 } 913 914 static inline int 915 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 916 { 917 return 0; 918 } 919 #endif 920 921 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) 922 { 923 int i, err = 0, cnt = 0; 924 925 spin_lock_bh(&net->xfrm.xfrm_state_lock); 926 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 927 if (err) 928 goto out; 929 930 err = -ESRCH; 931 for (i = 0; i <= net->xfrm.state_hmask; i++) { 932 struct xfrm_state *x; 933 restart: 934 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) { 935 if (!xfrm_state_kern(x) && 936 xfrm_id_proto_match(x->id.proto, proto)) { 937 xfrm_state_hold(x); 938 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 939 940 err = xfrm_state_delete(x); 941 xfrm_audit_state_delete(x, err ? 0 : 1, 942 task_valid); 943 xfrm_state_put(x); 944 if (!err) 945 cnt++; 946 947 spin_lock_bh(&net->xfrm.xfrm_state_lock); 948 goto restart; 949 } 950 } 951 } 952 out: 953 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 954 if (cnt) 955 err = 0; 956 957 return err; 958 } 959 EXPORT_SYMBOL(xfrm_state_flush); 960 961 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 962 { 963 struct xfrm_state *x; 964 struct hlist_node *tmp; 965 struct xfrm_dev_offload *xso; 966 int i, err = 0, cnt = 0; 967 968 spin_lock_bh(&net->xfrm.xfrm_state_lock); 969 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 970 if (err) 971 goto out; 972 973 err = -ESRCH; 974 for (i = 0; i <= net->xfrm.state_hmask; i++) { 975 restart: 976 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) { 977 xso = &x->xso; 978 979 if (!xfrm_state_kern(x) && xso->dev == dev) { 980 xfrm_state_hold(x); 981 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 982 983 err = xfrm_state_delete(x); 984 xfrm_dev_state_free(x); 985 986 xfrm_audit_state_delete(x, err ? 0 : 1, 987 task_valid); 988 xfrm_state_put(x); 989 if (!err) 990 cnt++; 991 992 spin_lock_bh(&net->xfrm.xfrm_state_lock); 993 goto restart; 994 } 995 } 996 } 997 if (cnt) 998 err = 0; 999 1000 out: 1001 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1002 1003 spin_lock_bh(&xfrm_state_dev_gc_lock); 1004 restart_gc: 1005 hlist_for_each_entry_safe(x, tmp, &xfrm_state_dev_gc_list, dev_gclist) { 1006 xso = &x->xso; 1007 1008 if (xso->dev == dev) { 1009 spin_unlock_bh(&xfrm_state_dev_gc_lock); 1010 xfrm_dev_state_free(x); 1011 spin_lock_bh(&xfrm_state_dev_gc_lock); 1012 goto restart_gc; 1013 } 1014 1015 } 1016 spin_unlock_bh(&xfrm_state_dev_gc_lock); 1017 1018 xfrm_flush_gc(); 1019 1020 return err; 1021 } 1022 EXPORT_SYMBOL(xfrm_dev_state_flush); 1023 1024 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 1025 { 1026 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1027 si->sadcnt = net->xfrm.state_num; 1028 si->sadhcnt = net->xfrm.state_hmask + 1; 1029 si->sadhmcnt = xfrm_state_hashmax; 1030 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1031 } 1032 EXPORT_SYMBOL(xfrm_sad_getinfo); 1033 1034 static void 1035 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 1036 { 1037 const struct flowi4 *fl4 = &fl->u.ip4; 1038 1039 sel->daddr.a4 = fl4->daddr; 1040 sel->saddr.a4 = fl4->saddr; 1041 sel->dport = xfrm_flowi_dport(fl, &fl4->uli); 1042 sel->dport_mask = htons(0xffff); 1043 sel->sport = xfrm_flowi_sport(fl, &fl4->uli); 1044 sel->sport_mask = htons(0xffff); 1045 sel->family = AF_INET; 1046 sel->prefixlen_d = 32; 1047 sel->prefixlen_s = 32; 1048 sel->proto = fl4->flowi4_proto; 1049 sel->ifindex = fl4->flowi4_oif; 1050 } 1051 1052 static void 1053 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) 1054 { 1055 const struct flowi6 *fl6 = &fl->u.ip6; 1056 1057 /* Initialize temporary selector matching only to current session. */ 1058 *(struct in6_addr *)&sel->daddr = fl6->daddr; 1059 *(struct in6_addr *)&sel->saddr = fl6->saddr; 1060 sel->dport = xfrm_flowi_dport(fl, &fl6->uli); 1061 sel->dport_mask = htons(0xffff); 1062 sel->sport = xfrm_flowi_sport(fl, &fl6->uli); 1063 sel->sport_mask = htons(0xffff); 1064 sel->family = AF_INET6; 1065 sel->prefixlen_d = 128; 1066 sel->prefixlen_s = 128; 1067 sel->proto = fl6->flowi6_proto; 1068 sel->ifindex = fl6->flowi6_oif; 1069 } 1070 1071 static void 1072 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 1073 const struct xfrm_tmpl *tmpl, 1074 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1075 unsigned short family) 1076 { 1077 switch (family) { 1078 case AF_INET: 1079 __xfrm4_init_tempsel(&x->sel, fl); 1080 break; 1081 case AF_INET6: 1082 __xfrm6_init_tempsel(&x->sel, fl); 1083 break; 1084 } 1085 1086 x->id = tmpl->id; 1087 1088 switch (tmpl->encap_family) { 1089 case AF_INET: 1090 if (x->id.daddr.a4 == 0) 1091 x->id.daddr.a4 = daddr->a4; 1092 x->props.saddr = tmpl->saddr; 1093 if (x->props.saddr.a4 == 0) 1094 x->props.saddr.a4 = saddr->a4; 1095 break; 1096 case AF_INET6: 1097 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) 1098 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); 1099 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); 1100 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) 1101 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); 1102 break; 1103 } 1104 1105 x->props.mode = tmpl->mode; 1106 x->props.reqid = tmpl->reqid; 1107 x->props.family = tmpl->encap_family; 1108 } 1109 1110 struct xfrm_hash_state_ptrs { 1111 const struct hlist_head *bydst; 1112 const struct hlist_head *bysrc; 1113 const struct hlist_head *byspi; 1114 unsigned int hmask; 1115 }; 1116 1117 static void xfrm_hash_ptrs_get(const struct net *net, struct xfrm_hash_state_ptrs *ptrs) 1118 { 1119 unsigned int sequence; 1120 1121 do { 1122 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 1123 1124 ptrs->bydst = xfrm_state_deref_check(net->xfrm.state_bydst, net); 1125 ptrs->bysrc = xfrm_state_deref_check(net->xfrm.state_bysrc, net); 1126 ptrs->byspi = xfrm_state_deref_check(net->xfrm.state_byspi, net); 1127 ptrs->hmask = net->xfrm.state_hmask; 1128 } while (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)); 1129 } 1130 1131 static struct xfrm_state *__xfrm_state_lookup_all(const struct xfrm_hash_state_ptrs *state_ptrs, 1132 u32 mark, 1133 const xfrm_address_t *daddr, 1134 __be32 spi, u8 proto, 1135 unsigned short family, 1136 struct xfrm_dev_offload *xdo) 1137 { 1138 unsigned int h = __xfrm_spi_hash(daddr, spi, proto, family, state_ptrs->hmask); 1139 struct xfrm_state *x; 1140 1141 hlist_for_each_entry_rcu(x, state_ptrs->byspi + h, byspi) { 1142 #ifdef CONFIG_XFRM_OFFLOAD 1143 if (xdo->type == XFRM_DEV_OFFLOAD_PACKET) { 1144 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1145 /* HW states are in the head of list, there is 1146 * no need to iterate further. 1147 */ 1148 break; 1149 1150 /* Packet offload: both policy and SA should 1151 * have same device. 1152 */ 1153 if (xdo->dev != x->xso.dev) 1154 continue; 1155 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1156 /* Skip HW policy for SW lookups */ 1157 continue; 1158 #endif 1159 if (x->props.family != family || 1160 x->id.spi != spi || 1161 x->id.proto != proto || 1162 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1163 continue; 1164 1165 if ((mark & x->mark.m) != x->mark.v) 1166 continue; 1167 if (!xfrm_state_hold_rcu(x)) 1168 continue; 1169 return x; 1170 } 1171 1172 return NULL; 1173 } 1174 1175 static struct xfrm_state *__xfrm_state_lookup(const struct xfrm_hash_state_ptrs *state_ptrs, 1176 u32 mark, 1177 const xfrm_address_t *daddr, 1178 __be32 spi, u8 proto, 1179 unsigned short family) 1180 { 1181 unsigned int h = __xfrm_spi_hash(daddr, spi, proto, family, state_ptrs->hmask); 1182 struct xfrm_state *x; 1183 1184 hlist_for_each_entry_rcu(x, state_ptrs->byspi + h, byspi) { 1185 if (x->props.family != family || 1186 x->id.spi != spi || 1187 x->id.proto != proto || 1188 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1189 continue; 1190 1191 if ((mark & x->mark.m) != x->mark.v) 1192 continue; 1193 if (!xfrm_state_hold_rcu(x)) 1194 continue; 1195 return x; 1196 } 1197 1198 return NULL; 1199 } 1200 1201 struct xfrm_state *xfrm_input_state_lookup(struct net *net, u32 mark, 1202 const xfrm_address_t *daddr, 1203 __be32 spi, u8 proto, 1204 unsigned short family) 1205 { 1206 struct xfrm_hash_state_ptrs state_ptrs; 1207 struct hlist_head *state_cache_input; 1208 struct xfrm_state *x = NULL; 1209 1210 state_cache_input = raw_cpu_ptr(net->xfrm.state_cache_input); 1211 1212 rcu_read_lock(); 1213 hlist_for_each_entry_rcu(x, state_cache_input, state_cache_input) { 1214 if (x->props.family != family || 1215 x->id.spi != spi || 1216 x->id.proto != proto || 1217 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1218 continue; 1219 1220 if ((mark & x->mark.m) != x->mark.v) 1221 continue; 1222 if (!xfrm_state_hold_rcu(x)) 1223 continue; 1224 goto out; 1225 } 1226 1227 xfrm_hash_ptrs_get(net, &state_ptrs); 1228 1229 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 1230 1231 if (x && x->km.state == XFRM_STATE_VALID) { 1232 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1233 if (hlist_unhashed(&x->state_cache_input)) { 1234 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1235 } else { 1236 hlist_del_rcu(&x->state_cache_input); 1237 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1238 } 1239 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1240 } 1241 1242 out: 1243 rcu_read_unlock(); 1244 return x; 1245 } 1246 EXPORT_SYMBOL(xfrm_input_state_lookup); 1247 1248 static struct xfrm_state *__xfrm_state_lookup_byaddr(const struct xfrm_hash_state_ptrs *state_ptrs, 1249 u32 mark, 1250 const xfrm_address_t *daddr, 1251 const xfrm_address_t *saddr, 1252 u8 proto, unsigned short family) 1253 { 1254 unsigned int h = __xfrm_src_hash(daddr, saddr, family, state_ptrs->hmask); 1255 struct xfrm_state *x; 1256 1257 hlist_for_each_entry_rcu(x, state_ptrs->bysrc + h, bysrc) { 1258 if (x->props.family != family || 1259 x->id.proto != proto || 1260 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1261 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1262 continue; 1263 1264 if ((mark & x->mark.m) != x->mark.v) 1265 continue; 1266 if (!xfrm_state_hold_rcu(x)) 1267 continue; 1268 return x; 1269 } 1270 1271 return NULL; 1272 } 1273 1274 static inline struct xfrm_state * 1275 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 1276 { 1277 struct xfrm_hash_state_ptrs state_ptrs; 1278 struct net *net = xs_net(x); 1279 u32 mark = x->mark.v & x->mark.m; 1280 1281 xfrm_hash_ptrs_get(net, &state_ptrs); 1282 1283 if (use_spi) 1284 return __xfrm_state_lookup(&state_ptrs, mark, &x->id.daddr, 1285 x->id.spi, x->id.proto, family); 1286 else 1287 return __xfrm_state_lookup_byaddr(&state_ptrs, mark, 1288 &x->id.daddr, 1289 &x->props.saddr, 1290 x->id.proto, family); 1291 } 1292 1293 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 1294 { 1295 if (have_hash_collision && 1296 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 1297 net->xfrm.state_num > net->xfrm.state_hmask) 1298 schedule_work(&net->xfrm.state_hash_work); 1299 } 1300 1301 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 1302 const struct flowi *fl, unsigned short family, 1303 struct xfrm_state **best, int *acq_in_progress, 1304 int *error, unsigned int pcpu_id) 1305 { 1306 /* Resolution logic: 1307 * 1. There is a valid state with matching selector. Done. 1308 * 2. Valid state with inappropriate selector. Skip. 1309 * 1310 * Entering area of "sysdeps". 1311 * 1312 * 3. If state is not valid, selector is temporary, it selects 1313 * only session which triggered previous resolution. Key 1314 * manager will do something to install a state with proper 1315 * selector. 1316 */ 1317 if (x->km.state == XFRM_STATE_VALID) { 1318 if ((x->sel.family && 1319 (x->sel.family != family || 1320 !xfrm_selector_match(&x->sel, fl, family))) || 1321 !security_xfrm_state_pol_flow_match(x, pol, 1322 &fl->u.__fl_common)) 1323 return; 1324 1325 if (x->pcpu_num != UINT_MAX && x->pcpu_num != pcpu_id) 1326 return; 1327 1328 if (!*best || 1329 ((*best)->pcpu_num == UINT_MAX && x->pcpu_num == pcpu_id) || 1330 (*best)->km.dying > x->km.dying || 1331 ((*best)->km.dying == x->km.dying && 1332 (*best)->curlft.add_time < x->curlft.add_time)) 1333 *best = x; 1334 } else if (x->km.state == XFRM_STATE_ACQ) { 1335 if (!*best || x->pcpu_num == pcpu_id) 1336 *acq_in_progress = 1; 1337 } else if (x->km.state == XFRM_STATE_ERROR || 1338 x->km.state == XFRM_STATE_EXPIRED) { 1339 if ((!x->sel.family || 1340 (x->sel.family == family && 1341 xfrm_selector_match(&x->sel, fl, family))) && 1342 security_xfrm_state_pol_flow_match(x, pol, 1343 &fl->u.__fl_common)) 1344 *error = -ESRCH; 1345 } 1346 } 1347 1348 struct xfrm_state * 1349 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1350 const struct flowi *fl, struct xfrm_tmpl *tmpl, 1351 struct xfrm_policy *pol, int *err, 1352 unsigned short family, u32 if_id) 1353 { 1354 static xfrm_address_t saddr_wildcard = { }; 1355 struct xfrm_hash_state_ptrs state_ptrs; 1356 struct net *net = xp_net(pol); 1357 unsigned int h, h_wildcard; 1358 struct xfrm_state *x, *x0, *to_put; 1359 int acquire_in_progress = 0; 1360 int error = 0; 1361 struct xfrm_state *best = NULL; 1362 u32 mark = pol->mark.v & pol->mark.m; 1363 unsigned short encap_family = tmpl->encap_family; 1364 unsigned int sequence; 1365 struct km_event c; 1366 unsigned int pcpu_id; 1367 bool cached = false; 1368 1369 /* We need the cpu id just as a lookup key, 1370 * we don't require it to be stable. 1371 */ 1372 pcpu_id = raw_smp_processor_id(); 1373 1374 to_put = NULL; 1375 1376 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 1377 1378 rcu_read_lock(); 1379 xfrm_hash_ptrs_get(net, &state_ptrs); 1380 1381 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1382 if (x->props.family == encap_family && 1383 x->props.reqid == tmpl->reqid && 1384 (mark & x->mark.m) == x->mark.v && 1385 x->if_id == if_id && 1386 !(x->props.flags & XFRM_STATE_WILDRECV) && 1387 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1388 tmpl->mode == x->props.mode && 1389 tmpl->id.proto == x->id.proto && 1390 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1391 xfrm_state_look_at(pol, x, fl, encap_family, 1392 &best, &acquire_in_progress, &error, pcpu_id); 1393 } 1394 1395 if (best) 1396 goto cached; 1397 1398 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1399 if (x->props.family == encap_family && 1400 x->props.reqid == tmpl->reqid && 1401 (mark & x->mark.m) == x->mark.v && 1402 x->if_id == if_id && 1403 !(x->props.flags & XFRM_STATE_WILDRECV) && 1404 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1405 tmpl->mode == x->props.mode && 1406 tmpl->id.proto == x->id.proto && 1407 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1408 xfrm_state_look_at(pol, x, fl, family, 1409 &best, &acquire_in_progress, &error, pcpu_id); 1410 } 1411 1412 cached: 1413 cached = true; 1414 if (best) 1415 goto found; 1416 else if (error) 1417 best = NULL; 1418 else if (acquire_in_progress) /* XXX: acquire_in_progress should not happen */ 1419 WARN_ON(1); 1420 1421 h = __xfrm_dst_hash(daddr, saddr, tmpl->reqid, encap_family, state_ptrs.hmask); 1422 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h, bydst) { 1423 #ifdef CONFIG_XFRM_OFFLOAD 1424 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1425 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1426 /* HW states are in the head of list, there is 1427 * no need to iterate further. 1428 */ 1429 break; 1430 1431 /* Packet offload: both policy and SA should 1432 * have same device. 1433 */ 1434 if (pol->xdo.dev != x->xso.dev) 1435 continue; 1436 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1437 /* Skip HW policy for SW lookups */ 1438 continue; 1439 #endif 1440 if (x->props.family == encap_family && 1441 x->props.reqid == tmpl->reqid && 1442 (mark & x->mark.m) == x->mark.v && 1443 x->if_id == if_id && 1444 !(x->props.flags & XFRM_STATE_WILDRECV) && 1445 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1446 tmpl->mode == x->props.mode && 1447 tmpl->id.proto == x->id.proto && 1448 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1449 xfrm_state_look_at(pol, x, fl, family, 1450 &best, &acquire_in_progress, &error, pcpu_id); 1451 } 1452 if (best || acquire_in_progress) 1453 goto found; 1454 1455 h_wildcard = __xfrm_dst_hash(daddr, &saddr_wildcard, tmpl->reqid, 1456 encap_family, state_ptrs.hmask); 1457 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h_wildcard, bydst) { 1458 #ifdef CONFIG_XFRM_OFFLOAD 1459 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1460 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1461 /* HW states are in the head of list, there is 1462 * no need to iterate further. 1463 */ 1464 break; 1465 1466 /* Packet offload: both policy and SA should 1467 * have same device. 1468 */ 1469 if (pol->xdo.dev != x->xso.dev) 1470 continue; 1471 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1472 /* Skip HW policy for SW lookups */ 1473 continue; 1474 #endif 1475 if (x->props.family == encap_family && 1476 x->props.reqid == tmpl->reqid && 1477 (mark & x->mark.m) == x->mark.v && 1478 x->if_id == if_id && 1479 !(x->props.flags & XFRM_STATE_WILDRECV) && 1480 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1481 tmpl->mode == x->props.mode && 1482 tmpl->id.proto == x->id.proto && 1483 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1484 xfrm_state_look_at(pol, x, fl, family, 1485 &best, &acquire_in_progress, &error, pcpu_id); 1486 } 1487 1488 found: 1489 if (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || 1490 (best && (best->pcpu_num == pcpu_id))) 1491 x = best; 1492 1493 if (!x && !error && !acquire_in_progress) { 1494 if (tmpl->id.spi && 1495 (x0 = __xfrm_state_lookup_all(&state_ptrs, mark, daddr, 1496 tmpl->id.spi, tmpl->id.proto, 1497 encap_family, 1498 &pol->xdo)) != NULL) { 1499 to_put = x0; 1500 error = -EEXIST; 1501 goto out; 1502 } 1503 1504 c.net = net; 1505 /* If the KMs have no listeners (yet...), avoid allocating an SA 1506 * for each and every packet - garbage collection might not 1507 * handle the flood. 1508 */ 1509 if (!km_is_alive(&c)) { 1510 error = -ESRCH; 1511 goto out; 1512 } 1513 1514 x = xfrm_state_alloc(net); 1515 if (x == NULL) { 1516 error = -ENOMEM; 1517 goto out; 1518 } 1519 /* Initialize temporary state matching only 1520 * to current session. */ 1521 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1522 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1523 x->if_id = if_id; 1524 if ((pol->flags & XFRM_POLICY_CPU_ACQUIRE) && best) 1525 x->pcpu_num = pcpu_id; 1526 1527 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1528 if (error) { 1529 x->km.state = XFRM_STATE_DEAD; 1530 to_put = x; 1531 x = NULL; 1532 goto out; 1533 } 1534 #ifdef CONFIG_XFRM_OFFLOAD 1535 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1536 struct xfrm_dev_offload *xdo = &pol->xdo; 1537 struct xfrm_dev_offload *xso = &x->xso; 1538 struct net_device *dev = xdo->dev; 1539 1540 xso->type = XFRM_DEV_OFFLOAD_PACKET; 1541 xso->dir = xdo->dir; 1542 xso->dev = dev; 1543 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ; 1544 netdev_hold(dev, &xso->dev_tracker, GFP_ATOMIC); 1545 error = dev->xfrmdev_ops->xdo_dev_state_add(dev, x, 1546 NULL); 1547 if (error) { 1548 xso->dir = 0; 1549 netdev_put(dev, &xso->dev_tracker); 1550 xso->dev = NULL; 1551 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 1552 x->km.state = XFRM_STATE_DEAD; 1553 to_put = x; 1554 x = NULL; 1555 goto out; 1556 } 1557 } 1558 #endif 1559 if (km_query(x, tmpl, pol) == 0) { 1560 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1561 x->km.state = XFRM_STATE_ACQ; 1562 x->dir = XFRM_SA_DIR_OUT; 1563 list_add(&x->km.all, &net->xfrm.state_all); 1564 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 1565 XFRM_STATE_INSERT(bydst, &x->bydst, 1566 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1567 x->xso.type); 1568 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1569 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1570 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1571 x->xso.type); 1572 INIT_HLIST_NODE(&x->state_cache); 1573 if (x->id.spi) { 1574 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1575 XFRM_STATE_INSERT(byspi, &x->byspi, 1576 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 1577 x->xso.type); 1578 } 1579 if (x->km.seq) { 1580 h = xfrm_seq_hash(net, x->km.seq); 1581 XFRM_STATE_INSERT(byseq, &x->byseq, 1582 xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, 1583 x->xso.type); 1584 } 1585 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1586 hrtimer_start(&x->mtimer, 1587 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1588 HRTIMER_MODE_REL_SOFT); 1589 net->xfrm.state_num++; 1590 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1591 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1592 } else { 1593 #ifdef CONFIG_XFRM_OFFLOAD 1594 struct xfrm_dev_offload *xso = &x->xso; 1595 1596 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) { 1597 xfrm_dev_state_delete(x); 1598 xfrm_dev_state_free(x); 1599 } 1600 #endif 1601 x->km.state = XFRM_STATE_DEAD; 1602 to_put = x; 1603 x = NULL; 1604 error = -ESRCH; 1605 } 1606 1607 /* Use the already installed 'fallback' while the CPU-specific 1608 * SA acquire is handled*/ 1609 if (best) 1610 x = best; 1611 } 1612 out: 1613 if (x) { 1614 if (!xfrm_state_hold_rcu(x)) { 1615 *err = -EAGAIN; 1616 x = NULL; 1617 } 1618 } else { 1619 *err = acquire_in_progress ? -EAGAIN : error; 1620 } 1621 1622 if (x && x->km.state == XFRM_STATE_VALID && !cached && 1623 (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || x->pcpu_num == pcpu_id)) { 1624 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1625 if (hlist_unhashed(&x->state_cache)) 1626 hlist_add_head_rcu(&x->state_cache, &pol->state_cache_list); 1627 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1628 } 1629 1630 rcu_read_unlock(); 1631 if (to_put) 1632 xfrm_state_put(to_put); 1633 1634 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) { 1635 *err = -EAGAIN; 1636 if (x) { 1637 xfrm_state_put(x); 1638 x = NULL; 1639 } 1640 } 1641 1642 return x; 1643 } 1644 1645 struct xfrm_state * 1646 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1647 xfrm_address_t *daddr, xfrm_address_t *saddr, 1648 unsigned short family, u8 mode, u8 proto, u32 reqid) 1649 { 1650 unsigned int h; 1651 struct xfrm_state *rx = NULL, *x = NULL; 1652 1653 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1654 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1655 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1656 if (x->props.family == family && 1657 x->props.reqid == reqid && 1658 (mark & x->mark.m) == x->mark.v && 1659 x->if_id == if_id && 1660 !(x->props.flags & XFRM_STATE_WILDRECV) && 1661 xfrm_state_addr_check(x, daddr, saddr, family) && 1662 mode == x->props.mode && 1663 proto == x->id.proto && 1664 x->km.state == XFRM_STATE_VALID) { 1665 rx = x; 1666 break; 1667 } 1668 } 1669 1670 if (rx) 1671 xfrm_state_hold(rx); 1672 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1673 1674 1675 return rx; 1676 } 1677 EXPORT_SYMBOL(xfrm_stateonly_find); 1678 1679 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1680 unsigned short family) 1681 { 1682 struct xfrm_state *x; 1683 struct xfrm_state_walk *w; 1684 1685 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1686 list_for_each_entry(w, &net->xfrm.state_all, all) { 1687 x = container_of(w, struct xfrm_state, km); 1688 if (x->props.family != family || 1689 x->id.spi != spi) 1690 continue; 1691 1692 xfrm_state_hold(x); 1693 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1694 return x; 1695 } 1696 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1697 return NULL; 1698 } 1699 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1700 1701 static struct xfrm_state *xfrm_state_lookup_spi_proto(struct net *net, __be32 spi, u8 proto) 1702 { 1703 struct xfrm_state *x; 1704 unsigned int i; 1705 1706 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1707 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_byspi, net) + i, byspi) { 1708 if (x->id.spi == spi && x->id.proto == proto) 1709 return x; 1710 } 1711 } 1712 return NULL; 1713 } 1714 1715 static void __xfrm_state_insert(struct xfrm_state *x) 1716 { 1717 struct net *net = xs_net(x); 1718 unsigned int h; 1719 1720 list_add(&x->km.all, &net->xfrm.state_all); 1721 1722 /* Sanitize mark before store */ 1723 x->mark.v &= x->mark.m; 1724 1725 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1726 x->props.reqid, x->props.family); 1727 XFRM_STATE_INSERT(bydst, &x->bydst, 1728 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1729 x->xso.type); 1730 1731 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1732 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1733 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1734 x->xso.type); 1735 1736 if (x->id.spi) { 1737 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1738 x->props.family); 1739 1740 XFRM_STATE_INSERT(byspi, &x->byspi, 1741 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 1742 x->xso.type); 1743 } 1744 1745 if (x->km.seq) { 1746 h = xfrm_seq_hash(net, x->km.seq); 1747 1748 XFRM_STATE_INSERT(byseq, &x->byseq, 1749 xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, 1750 x->xso.type); 1751 } 1752 1753 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); 1754 if (x->replay_maxage) 1755 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1756 1757 net->xfrm.state_num++; 1758 1759 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1760 xfrm_nat_keepalive_state_updated(x); 1761 } 1762 1763 /* net->xfrm.xfrm_state_lock is held */ 1764 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1765 { 1766 struct net *net = xs_net(xnew); 1767 unsigned short family = xnew->props.family; 1768 u32 reqid = xnew->props.reqid; 1769 struct xfrm_state *x; 1770 unsigned int h; 1771 u32 mark = xnew->mark.v & xnew->mark.m; 1772 u32 if_id = xnew->if_id; 1773 u32 cpu_id = xnew->pcpu_num; 1774 1775 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1776 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1777 if (x->props.family == family && 1778 x->props.reqid == reqid && 1779 x->if_id == if_id && 1780 x->pcpu_num == cpu_id && 1781 (mark & x->mark.m) == x->mark.v && 1782 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1783 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1784 x->genid++; 1785 } 1786 } 1787 1788 void xfrm_state_insert(struct xfrm_state *x) 1789 { 1790 struct net *net = xs_net(x); 1791 1792 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1793 __xfrm_state_bump_genids(x); 1794 __xfrm_state_insert(x); 1795 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1796 } 1797 EXPORT_SYMBOL(xfrm_state_insert); 1798 1799 /* net->xfrm.xfrm_state_lock is held */ 1800 static struct xfrm_state *__find_acq_core(struct net *net, 1801 const struct xfrm_mark *m, 1802 unsigned short family, u8 mode, 1803 u32 reqid, u32 if_id, u32 pcpu_num, u8 proto, 1804 const xfrm_address_t *daddr, 1805 const xfrm_address_t *saddr, 1806 int create) 1807 { 1808 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1809 struct xfrm_state *x; 1810 u32 mark = m->v & m->m; 1811 1812 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1813 if (x->props.reqid != reqid || 1814 x->props.mode != mode || 1815 x->props.family != family || 1816 x->km.state != XFRM_STATE_ACQ || 1817 x->id.spi != 0 || 1818 x->id.proto != proto || 1819 (mark & x->mark.m) != x->mark.v || 1820 x->pcpu_num != pcpu_num || 1821 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1822 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1823 continue; 1824 1825 xfrm_state_hold(x); 1826 return x; 1827 } 1828 1829 if (!create) 1830 return NULL; 1831 1832 x = xfrm_state_alloc(net); 1833 if (likely(x)) { 1834 switch (family) { 1835 case AF_INET: 1836 x->sel.daddr.a4 = daddr->a4; 1837 x->sel.saddr.a4 = saddr->a4; 1838 x->sel.prefixlen_d = 32; 1839 x->sel.prefixlen_s = 32; 1840 x->props.saddr.a4 = saddr->a4; 1841 x->id.daddr.a4 = daddr->a4; 1842 break; 1843 1844 case AF_INET6: 1845 x->sel.daddr.in6 = daddr->in6; 1846 x->sel.saddr.in6 = saddr->in6; 1847 x->sel.prefixlen_d = 128; 1848 x->sel.prefixlen_s = 128; 1849 x->props.saddr.in6 = saddr->in6; 1850 x->id.daddr.in6 = daddr->in6; 1851 break; 1852 } 1853 1854 x->pcpu_num = pcpu_num; 1855 x->km.state = XFRM_STATE_ACQ; 1856 x->id.proto = proto; 1857 x->props.family = family; 1858 x->props.mode = mode; 1859 x->props.reqid = reqid; 1860 x->if_id = if_id; 1861 x->mark.v = m->v; 1862 x->mark.m = m->m; 1863 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1864 xfrm_state_hold(x); 1865 hrtimer_start(&x->mtimer, 1866 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1867 HRTIMER_MODE_REL_SOFT); 1868 list_add(&x->km.all, &net->xfrm.state_all); 1869 XFRM_STATE_INSERT(bydst, &x->bydst, 1870 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1871 x->xso.type); 1872 h = xfrm_src_hash(net, daddr, saddr, family); 1873 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1874 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1875 x->xso.type); 1876 1877 net->xfrm.state_num++; 1878 1879 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1880 } 1881 1882 return x; 1883 } 1884 1885 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num); 1886 1887 int xfrm_state_add(struct xfrm_state *x) 1888 { 1889 struct net *net = xs_net(x); 1890 struct xfrm_state *x1, *to_put; 1891 int family; 1892 int err; 1893 u32 mark = x->mark.v & x->mark.m; 1894 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1895 1896 family = x->props.family; 1897 1898 to_put = NULL; 1899 1900 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1901 1902 x1 = __xfrm_state_locate(x, use_spi, family); 1903 if (x1) { 1904 to_put = x1; 1905 x1 = NULL; 1906 err = -EEXIST; 1907 goto out; 1908 } 1909 1910 if (use_spi && x->km.seq) { 1911 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq, x->pcpu_num); 1912 if (x1 && ((x1->id.proto != x->id.proto) || 1913 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1914 to_put = x1; 1915 x1 = NULL; 1916 } 1917 } 1918 1919 if (use_spi && !x1) 1920 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1921 x->props.reqid, x->if_id, x->pcpu_num, x->id.proto, 1922 &x->id.daddr, &x->props.saddr, 0); 1923 1924 __xfrm_state_bump_genids(x); 1925 __xfrm_state_insert(x); 1926 err = 0; 1927 1928 out: 1929 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1930 1931 if (x1) { 1932 xfrm_state_delete(x1); 1933 xfrm_state_put(x1); 1934 } 1935 1936 if (to_put) 1937 xfrm_state_put(to_put); 1938 1939 return err; 1940 } 1941 EXPORT_SYMBOL(xfrm_state_add); 1942 1943 #ifdef CONFIG_XFRM_MIGRATE 1944 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security) 1945 { 1946 struct xfrm_user_sec_ctx *uctx; 1947 int size = sizeof(*uctx) + security->ctx_len; 1948 int err; 1949 1950 uctx = kmalloc(size, GFP_KERNEL); 1951 if (!uctx) 1952 return -ENOMEM; 1953 1954 uctx->exttype = XFRMA_SEC_CTX; 1955 uctx->len = size; 1956 uctx->ctx_doi = security->ctx_doi; 1957 uctx->ctx_alg = security->ctx_alg; 1958 uctx->ctx_len = security->ctx_len; 1959 memcpy(uctx + 1, security->ctx_str, security->ctx_len); 1960 err = security_xfrm_state_alloc(x, uctx); 1961 kfree(uctx); 1962 if (err) 1963 return err; 1964 1965 return 0; 1966 } 1967 1968 static struct xfrm_state *xfrm_state_clone_and_setup(struct xfrm_state *orig, 1969 struct xfrm_encap_tmpl *encap, 1970 struct xfrm_migrate *m) 1971 { 1972 struct net *net = xs_net(orig); 1973 struct xfrm_state *x = xfrm_state_alloc(net); 1974 if (!x) 1975 goto out; 1976 1977 memcpy(&x->id, &orig->id, sizeof(x->id)); 1978 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1979 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1980 x->props.mode = orig->props.mode; 1981 x->props.replay_window = orig->props.replay_window; 1982 x->props.reqid = orig->props.reqid; 1983 x->props.family = orig->props.family; 1984 x->props.saddr = orig->props.saddr; 1985 1986 if (orig->aalg) { 1987 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1988 if (!x->aalg) 1989 goto error; 1990 } 1991 x->props.aalgo = orig->props.aalgo; 1992 1993 if (orig->aead) { 1994 x->aead = xfrm_algo_aead_clone(orig->aead); 1995 x->geniv = orig->geniv; 1996 if (!x->aead) 1997 goto error; 1998 } 1999 if (orig->ealg) { 2000 x->ealg = xfrm_algo_clone(orig->ealg); 2001 if (!x->ealg) 2002 goto error; 2003 } 2004 x->props.ealgo = orig->props.ealgo; 2005 2006 if (orig->calg) { 2007 x->calg = xfrm_algo_clone(orig->calg); 2008 if (!x->calg) 2009 goto error; 2010 } 2011 x->props.calgo = orig->props.calgo; 2012 2013 if (encap || orig->encap) { 2014 if (encap) 2015 x->encap = kmemdup(encap, sizeof(*x->encap), 2016 GFP_KERNEL); 2017 else 2018 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 2019 GFP_KERNEL); 2020 2021 if (!x->encap) 2022 goto error; 2023 } 2024 2025 if (orig->security) 2026 if (clone_security(x, orig->security)) 2027 goto error; 2028 2029 if (orig->coaddr) { 2030 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 2031 GFP_KERNEL); 2032 if (!x->coaddr) 2033 goto error; 2034 } 2035 2036 if (orig->replay_esn) { 2037 if (xfrm_replay_clone(x, orig)) 2038 goto error; 2039 } 2040 2041 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 2042 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark)); 2043 2044 x->props.flags = orig->props.flags; 2045 x->props.extra_flags = orig->props.extra_flags; 2046 2047 x->pcpu_num = orig->pcpu_num; 2048 x->if_id = orig->if_id; 2049 x->tfcpad = orig->tfcpad; 2050 x->replay_maxdiff = orig->replay_maxdiff; 2051 x->replay_maxage = orig->replay_maxage; 2052 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft)); 2053 x->km.state = orig->km.state; 2054 x->km.seq = orig->km.seq; 2055 x->replay = orig->replay; 2056 x->preplay = orig->preplay; 2057 x->mapping_maxage = orig->mapping_maxage; 2058 x->lastused = orig->lastused; 2059 x->new_mapping = 0; 2060 x->new_mapping_sport = 0; 2061 x->dir = orig->dir; 2062 2063 x->mode_cbs = orig->mode_cbs; 2064 if (x->mode_cbs && x->mode_cbs->clone_state) { 2065 if (x->mode_cbs->clone_state(x, orig)) 2066 goto error; 2067 } 2068 2069 2070 x->props.family = m->new_family; 2071 memcpy(&x->id.daddr, &m->new_daddr, sizeof(x->id.daddr)); 2072 memcpy(&x->props.saddr, &m->new_saddr, sizeof(x->props.saddr)); 2073 2074 return x; 2075 2076 error: 2077 x->km.state = XFRM_STATE_DEAD; 2078 xfrm_state_put(x); 2079 out: 2080 return NULL; 2081 } 2082 2083 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 2084 u32 if_id) 2085 { 2086 unsigned int h; 2087 struct xfrm_state *x = NULL; 2088 2089 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2090 2091 if (m->reqid) { 2092 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 2093 m->reqid, m->old_family); 2094 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 2095 if (x->props.mode != m->mode || 2096 x->id.proto != m->proto) 2097 continue; 2098 if (m->reqid && x->props.reqid != m->reqid) 2099 continue; 2100 if (if_id != 0 && x->if_id != if_id) 2101 continue; 2102 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2103 m->old_family) || 2104 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2105 m->old_family)) 2106 continue; 2107 xfrm_state_hold(x); 2108 break; 2109 } 2110 } else { 2111 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 2112 m->old_family); 2113 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, bysrc) { 2114 if (x->props.mode != m->mode || 2115 x->id.proto != m->proto) 2116 continue; 2117 if (if_id != 0 && x->if_id != if_id) 2118 continue; 2119 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2120 m->old_family) || 2121 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2122 m->old_family)) 2123 continue; 2124 xfrm_state_hold(x); 2125 break; 2126 } 2127 } 2128 2129 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2130 2131 return x; 2132 } 2133 EXPORT_SYMBOL(xfrm_migrate_state_find); 2134 2135 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 2136 struct xfrm_migrate *m, 2137 struct xfrm_encap_tmpl *encap, 2138 struct net *net, 2139 struct xfrm_user_offload *xuo, 2140 struct netlink_ext_ack *extack) 2141 { 2142 struct xfrm_state *xc; 2143 2144 xc = xfrm_state_clone_and_setup(x, encap, m); 2145 if (!xc) 2146 return NULL; 2147 2148 if (xfrm_init_state(xc) < 0) 2149 goto error; 2150 2151 /* configure the hardware if offload is requested */ 2152 if (xuo && xfrm_dev_state_add(net, xc, xuo, extack)) 2153 goto error; 2154 2155 /* add state */ 2156 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 2157 /* a care is needed when the destination address of the 2158 state is to be updated as it is a part of triplet */ 2159 xfrm_state_insert(xc); 2160 } else { 2161 if (xfrm_state_add(xc) < 0) 2162 goto error_add; 2163 } 2164 2165 return xc; 2166 error_add: 2167 if (xuo) 2168 xfrm_dev_state_delete(xc); 2169 error: 2170 xc->km.state = XFRM_STATE_DEAD; 2171 xfrm_state_put(xc); 2172 return NULL; 2173 } 2174 EXPORT_SYMBOL(xfrm_state_migrate); 2175 #endif 2176 2177 int xfrm_state_update(struct xfrm_state *x) 2178 { 2179 struct xfrm_state *x1, *to_put; 2180 int err; 2181 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 2182 struct net *net = xs_net(x); 2183 2184 to_put = NULL; 2185 2186 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2187 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 2188 2189 err = -ESRCH; 2190 if (!x1) 2191 goto out; 2192 2193 if (xfrm_state_kern(x1)) { 2194 to_put = x1; 2195 err = -EEXIST; 2196 goto out; 2197 } 2198 2199 if (x1->km.state == XFRM_STATE_ACQ) { 2200 if (x->dir && x1->dir != x->dir) { 2201 to_put = x1; 2202 goto out; 2203 } 2204 2205 __xfrm_state_insert(x); 2206 x = NULL; 2207 } else { 2208 if (x1->dir != x->dir) { 2209 to_put = x1; 2210 goto out; 2211 } 2212 } 2213 err = 0; 2214 2215 out: 2216 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2217 2218 if (to_put) 2219 xfrm_state_put(to_put); 2220 2221 if (err) 2222 return err; 2223 2224 if (!x) { 2225 xfrm_state_delete(x1); 2226 xfrm_state_put(x1); 2227 return 0; 2228 } 2229 2230 err = -EINVAL; 2231 spin_lock_bh(&x1->lock); 2232 if (likely(x1->km.state == XFRM_STATE_VALID)) { 2233 if (x->encap && x1->encap && 2234 x->encap->encap_type == x1->encap->encap_type) 2235 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 2236 else if (x->encap || x1->encap) 2237 goto fail; 2238 2239 if (x->coaddr && x1->coaddr) { 2240 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 2241 } 2242 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 2243 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 2244 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 2245 x1->km.dying = 0; 2246 2247 hrtimer_start(&x1->mtimer, ktime_set(1, 0), 2248 HRTIMER_MODE_REL_SOFT); 2249 if (READ_ONCE(x1->curlft.use_time)) 2250 xfrm_state_check_expire(x1); 2251 2252 if (x->props.smark.m || x->props.smark.v || x->if_id) { 2253 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2254 2255 if (x->props.smark.m || x->props.smark.v) 2256 x1->props.smark = x->props.smark; 2257 2258 if (x->if_id) 2259 x1->if_id = x->if_id; 2260 2261 __xfrm_state_bump_genids(x1); 2262 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2263 } 2264 2265 err = 0; 2266 x->km.state = XFRM_STATE_DEAD; 2267 xfrm_dev_state_delete(x); 2268 __xfrm_state_put(x); 2269 } 2270 2271 fail: 2272 spin_unlock_bh(&x1->lock); 2273 2274 xfrm_state_put(x1); 2275 2276 return err; 2277 } 2278 EXPORT_SYMBOL(xfrm_state_update); 2279 2280 int xfrm_state_check_expire(struct xfrm_state *x) 2281 { 2282 /* All counters which are needed to decide if state is expired 2283 * are handled by SW for non-packet offload modes. Simply skip 2284 * the following update and save extra boilerplate in drivers. 2285 */ 2286 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 2287 xfrm_dev_state_update_stats(x); 2288 2289 if (!READ_ONCE(x->curlft.use_time)) 2290 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds()); 2291 2292 if (x->curlft.bytes >= x->lft.hard_byte_limit || 2293 x->curlft.packets >= x->lft.hard_packet_limit) { 2294 x->km.state = XFRM_STATE_EXPIRED; 2295 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); 2296 return -EINVAL; 2297 } 2298 2299 if (!x->km.dying && 2300 (x->curlft.bytes >= x->lft.soft_byte_limit || 2301 x->curlft.packets >= x->lft.soft_packet_limit)) { 2302 x->km.dying = 1; 2303 km_state_expired(x, 0, 0); 2304 } 2305 return 0; 2306 } 2307 EXPORT_SYMBOL(xfrm_state_check_expire); 2308 2309 void xfrm_state_update_stats(struct net *net) 2310 { 2311 struct xfrm_state *x; 2312 int i; 2313 2314 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2315 for (i = 0; i <= net->xfrm.state_hmask; i++) { 2316 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) 2317 xfrm_dev_state_update_stats(x); 2318 } 2319 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2320 } 2321 2322 struct xfrm_state * 2323 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 2324 u8 proto, unsigned short family) 2325 { 2326 struct xfrm_hash_state_ptrs state_ptrs; 2327 struct xfrm_state *x; 2328 2329 rcu_read_lock(); 2330 xfrm_hash_ptrs_get(net, &state_ptrs); 2331 2332 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 2333 rcu_read_unlock(); 2334 return x; 2335 } 2336 EXPORT_SYMBOL(xfrm_state_lookup); 2337 2338 struct xfrm_state * 2339 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 2340 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 2341 u8 proto, unsigned short family) 2342 { 2343 struct xfrm_hash_state_ptrs state_ptrs; 2344 struct xfrm_state *x; 2345 2346 rcu_read_lock(); 2347 2348 xfrm_hash_ptrs_get(net, &state_ptrs); 2349 2350 x = __xfrm_state_lookup_byaddr(&state_ptrs, mark, daddr, saddr, proto, family); 2351 rcu_read_unlock(); 2352 return x; 2353 } 2354 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 2355 2356 struct xfrm_state * 2357 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 2358 u32 if_id, u32 pcpu_num, u8 proto, const xfrm_address_t *daddr, 2359 const xfrm_address_t *saddr, int create, unsigned short family) 2360 { 2361 struct xfrm_state *x; 2362 2363 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2364 x = __find_acq_core(net, mark, family, mode, reqid, if_id, pcpu_num, 2365 proto, daddr, saddr, create); 2366 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2367 2368 return x; 2369 } 2370 EXPORT_SYMBOL(xfrm_find_acq); 2371 2372 #ifdef CONFIG_XFRM_SUB_POLICY 2373 #if IS_ENABLED(CONFIG_IPV6) 2374 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 2375 static void 2376 __xfrm6_sort(void **dst, void **src, int n, 2377 int (*cmp)(const void *p), int maxclass) 2378 { 2379 int count[XFRM_MAX_DEPTH] = { }; 2380 int class[XFRM_MAX_DEPTH]; 2381 int i; 2382 2383 for (i = 0; i < n; i++) { 2384 int c = cmp(src[i]); 2385 2386 class[i] = c; 2387 count[c]++; 2388 } 2389 2390 for (i = 2; i < maxclass; i++) 2391 count[i] += count[i - 1]; 2392 2393 for (i = 0; i < n; i++) { 2394 dst[count[class[i] - 1]++] = src[i]; 2395 src[i] = NULL; 2396 } 2397 } 2398 2399 /* Rule for xfrm_state: 2400 * 2401 * rule 1: select IPsec transport except AH 2402 * rule 2: select MIPv6 RO or inbound trigger 2403 * rule 3: select IPsec transport AH 2404 * rule 4: select IPsec tunnel 2405 * rule 5: others 2406 */ 2407 static int __xfrm6_state_sort_cmp(const void *p) 2408 { 2409 const struct xfrm_state *v = p; 2410 2411 switch (v->props.mode) { 2412 case XFRM_MODE_TRANSPORT: 2413 if (v->id.proto != IPPROTO_AH) 2414 return 1; 2415 else 2416 return 3; 2417 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2418 case XFRM_MODE_ROUTEOPTIMIZATION: 2419 case XFRM_MODE_IN_TRIGGER: 2420 return 2; 2421 #endif 2422 case XFRM_MODE_TUNNEL: 2423 case XFRM_MODE_BEET: 2424 case XFRM_MODE_IPTFS: 2425 return 4; 2426 } 2427 return 5; 2428 } 2429 2430 /* Rule for xfrm_tmpl: 2431 * 2432 * rule 1: select IPsec transport 2433 * rule 2: select MIPv6 RO or inbound trigger 2434 * rule 3: select IPsec tunnel 2435 * rule 4: others 2436 */ 2437 static int __xfrm6_tmpl_sort_cmp(const void *p) 2438 { 2439 const struct xfrm_tmpl *v = p; 2440 2441 switch (v->mode) { 2442 case XFRM_MODE_TRANSPORT: 2443 return 1; 2444 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2445 case XFRM_MODE_ROUTEOPTIMIZATION: 2446 case XFRM_MODE_IN_TRIGGER: 2447 return 2; 2448 #endif 2449 case XFRM_MODE_TUNNEL: 2450 case XFRM_MODE_BEET: 2451 case XFRM_MODE_IPTFS: 2452 return 3; 2453 } 2454 return 4; 2455 } 2456 #else 2457 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } 2458 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } 2459 2460 static inline void 2461 __xfrm6_sort(void **dst, void **src, int n, 2462 int (*cmp)(const void *p), int maxclass) 2463 { 2464 int i; 2465 2466 for (i = 0; i < n; i++) 2467 dst[i] = src[i]; 2468 } 2469 #endif /* CONFIG_IPV6 */ 2470 2471 void 2472 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 2473 unsigned short family) 2474 { 2475 int i; 2476 2477 if (family == AF_INET6) 2478 __xfrm6_sort((void **)dst, (void **)src, n, 2479 __xfrm6_tmpl_sort_cmp, 5); 2480 else 2481 for (i = 0; i < n; i++) 2482 dst[i] = src[i]; 2483 } 2484 2485 void 2486 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 2487 unsigned short family) 2488 { 2489 int i; 2490 2491 if (family == AF_INET6) 2492 __xfrm6_sort((void **)dst, (void **)src, n, 2493 __xfrm6_state_sort_cmp, 6); 2494 else 2495 for (i = 0; i < n; i++) 2496 dst[i] = src[i]; 2497 } 2498 #endif 2499 2500 /* Silly enough, but I'm lazy to build resolution list */ 2501 2502 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2503 { 2504 unsigned int h = xfrm_seq_hash(net, seq); 2505 struct xfrm_state *x; 2506 2507 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, byseq) { 2508 if (x->km.seq == seq && 2509 (mark & x->mark.m) == x->mark.v && 2510 x->pcpu_num == pcpu_num && 2511 x->km.state == XFRM_STATE_ACQ) { 2512 xfrm_state_hold(x); 2513 return x; 2514 } 2515 } 2516 2517 return NULL; 2518 } 2519 2520 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2521 { 2522 struct xfrm_state *x; 2523 2524 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2525 x = __xfrm_find_acq_byseq(net, mark, seq, pcpu_num); 2526 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2527 return x; 2528 } 2529 EXPORT_SYMBOL(xfrm_find_acq_byseq); 2530 2531 u32 xfrm_get_acqseq(void) 2532 { 2533 u32 res; 2534 static atomic_t acqseq; 2535 2536 do { 2537 res = atomic_inc_return(&acqseq); 2538 } while (!res); 2539 2540 return res; 2541 } 2542 EXPORT_SYMBOL(xfrm_get_acqseq); 2543 2544 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack) 2545 { 2546 switch (proto) { 2547 case IPPROTO_AH: 2548 case IPPROTO_ESP: 2549 break; 2550 2551 case IPPROTO_COMP: 2552 /* IPCOMP spi is 16-bits. */ 2553 if (max >= 0x10000) { 2554 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535"); 2555 return -EINVAL; 2556 } 2557 break; 2558 2559 default: 2560 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP"); 2561 return -EINVAL; 2562 } 2563 2564 if (min > max) { 2565 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max"); 2566 return -EINVAL; 2567 } 2568 2569 return 0; 2570 } 2571 EXPORT_SYMBOL(verify_spi_info); 2572 2573 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high, 2574 struct netlink_ext_ack *extack) 2575 { 2576 struct net *net = xs_net(x); 2577 unsigned int h; 2578 struct xfrm_state *x0; 2579 int err = -ENOENT; 2580 u32 range = high - low + 1; 2581 __be32 newspi = 0; 2582 2583 spin_lock_bh(&x->lock); 2584 if (x->km.state == XFRM_STATE_DEAD) { 2585 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state"); 2586 goto unlock; 2587 } 2588 2589 err = 0; 2590 if (x->id.spi) 2591 goto unlock; 2592 2593 err = -ENOENT; 2594 2595 for (h = 0; h < range; h++) { 2596 u32 spi = (low == high) ? low : get_random_u32_inclusive(low, high); 2597 if (spi == 0) 2598 goto next; 2599 newspi = htonl(spi); 2600 2601 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2602 x0 = xfrm_state_lookup_spi_proto(net, newspi, x->id.proto); 2603 if (!x0) { 2604 x->id.spi = newspi; 2605 h = xfrm_spi_hash(net, &x->id.daddr, newspi, x->id.proto, x->props.family); 2606 XFRM_STATE_INSERT(byspi, &x->byspi, 2607 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 2608 x->xso.type); 2609 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2610 err = 0; 2611 goto unlock; 2612 } 2613 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2614 2615 next: 2616 if (signal_pending(current)) { 2617 err = -ERESTARTSYS; 2618 goto unlock; 2619 } 2620 2621 if (low == high) 2622 break; 2623 } 2624 2625 if (err) 2626 NL_SET_ERR_MSG(extack, "No SPI available in the requested range"); 2627 2628 unlock: 2629 spin_unlock_bh(&x->lock); 2630 2631 return err; 2632 } 2633 EXPORT_SYMBOL(xfrm_alloc_spi); 2634 2635 static bool __xfrm_state_filter_match(struct xfrm_state *x, 2636 struct xfrm_address_filter *filter) 2637 { 2638 if (filter) { 2639 if ((filter->family == AF_INET || 2640 filter->family == AF_INET6) && 2641 x->props.family != filter->family) 2642 return false; 2643 2644 return addr_match(&x->props.saddr, &filter->saddr, 2645 filter->splen) && 2646 addr_match(&x->id.daddr, &filter->daddr, 2647 filter->dplen); 2648 } 2649 return true; 2650 } 2651 2652 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 2653 int (*func)(struct xfrm_state *, int, void*), 2654 void *data) 2655 { 2656 struct xfrm_state *state; 2657 struct xfrm_state_walk *x; 2658 int err = 0; 2659 2660 if (walk->seq != 0 && list_empty(&walk->all)) 2661 return 0; 2662 2663 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2664 if (list_empty(&walk->all)) 2665 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 2666 else 2667 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 2668 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 2669 if (x->state == XFRM_STATE_DEAD) 2670 continue; 2671 state = container_of(x, struct xfrm_state, km); 2672 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 2673 continue; 2674 if (!__xfrm_state_filter_match(state, walk->filter)) 2675 continue; 2676 err = func(state, walk->seq, data); 2677 if (err) { 2678 list_move_tail(&walk->all, &x->all); 2679 goto out; 2680 } 2681 walk->seq++; 2682 } 2683 if (walk->seq == 0) { 2684 err = -ENOENT; 2685 goto out; 2686 } 2687 list_del_init(&walk->all); 2688 out: 2689 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2690 return err; 2691 } 2692 EXPORT_SYMBOL(xfrm_state_walk); 2693 2694 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 2695 struct xfrm_address_filter *filter) 2696 { 2697 INIT_LIST_HEAD(&walk->all); 2698 walk->proto = proto; 2699 walk->state = XFRM_STATE_DEAD; 2700 walk->seq = 0; 2701 walk->filter = filter; 2702 } 2703 EXPORT_SYMBOL(xfrm_state_walk_init); 2704 2705 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 2706 { 2707 kfree(walk->filter); 2708 2709 if (list_empty(&walk->all)) 2710 return; 2711 2712 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2713 list_del(&walk->all); 2714 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2715 } 2716 EXPORT_SYMBOL(xfrm_state_walk_done); 2717 2718 static void xfrm_replay_timer_handler(struct timer_list *t) 2719 { 2720 struct xfrm_state *x = timer_container_of(x, t, rtimer); 2721 2722 spin_lock(&x->lock); 2723 2724 if (x->km.state == XFRM_STATE_VALID) { 2725 if (xfrm_aevent_is_on(xs_net(x))) 2726 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); 2727 else 2728 x->xflags |= XFRM_TIME_DEFER; 2729 } 2730 2731 spin_unlock(&x->lock); 2732 } 2733 2734 static LIST_HEAD(xfrm_km_list); 2735 2736 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2737 { 2738 struct xfrm_mgr *km; 2739 2740 rcu_read_lock(); 2741 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2742 if (km->notify_policy) 2743 km->notify_policy(xp, dir, c); 2744 rcu_read_unlock(); 2745 } 2746 2747 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 2748 { 2749 struct xfrm_mgr *km; 2750 rcu_read_lock(); 2751 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2752 if (km->notify) 2753 km->notify(x, c); 2754 rcu_read_unlock(); 2755 } 2756 2757 EXPORT_SYMBOL(km_policy_notify); 2758 EXPORT_SYMBOL(km_state_notify); 2759 2760 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 2761 { 2762 struct km_event c; 2763 2764 c.data.hard = hard; 2765 c.portid = portid; 2766 c.event = XFRM_MSG_EXPIRE; 2767 km_state_notify(x, &c); 2768 } 2769 2770 EXPORT_SYMBOL(km_state_expired); 2771 /* 2772 * We send to all registered managers regardless of failure 2773 * We are happy with one success 2774 */ 2775 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 2776 { 2777 int err = -EINVAL, acqret; 2778 struct xfrm_mgr *km; 2779 2780 rcu_read_lock(); 2781 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2782 acqret = km->acquire(x, t, pol); 2783 if (!acqret) 2784 err = acqret; 2785 } 2786 rcu_read_unlock(); 2787 return err; 2788 } 2789 EXPORT_SYMBOL(km_query); 2790 2791 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2792 { 2793 int err = -EINVAL; 2794 struct xfrm_mgr *km; 2795 2796 rcu_read_lock(); 2797 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2798 if (km->new_mapping) 2799 err = km->new_mapping(x, ipaddr, sport); 2800 if (!err) 2801 break; 2802 } 2803 rcu_read_unlock(); 2804 return err; 2805 } 2806 2807 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2808 { 2809 int ret = 0; 2810 2811 if (x->mapping_maxage) { 2812 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage || 2813 x->new_mapping_sport != sport) { 2814 x->new_mapping_sport = sport; 2815 x->new_mapping = jiffies / HZ; 2816 ret = __km_new_mapping(x, ipaddr, sport); 2817 } 2818 } else { 2819 ret = __km_new_mapping(x, ipaddr, sport); 2820 } 2821 2822 return ret; 2823 } 2824 EXPORT_SYMBOL(km_new_mapping); 2825 2826 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2827 { 2828 struct km_event c; 2829 2830 c.data.hard = hard; 2831 c.portid = portid; 2832 c.event = XFRM_MSG_POLEXPIRE; 2833 km_policy_notify(pol, dir, &c); 2834 } 2835 EXPORT_SYMBOL(km_policy_expired); 2836 2837 #ifdef CONFIG_XFRM_MIGRATE 2838 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2839 const struct xfrm_migrate *m, int num_migrate, 2840 const struct xfrm_kmaddress *k, 2841 const struct xfrm_encap_tmpl *encap) 2842 { 2843 int err = -EINVAL; 2844 int ret; 2845 struct xfrm_mgr *km; 2846 2847 rcu_read_lock(); 2848 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2849 if (km->migrate) { 2850 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2851 encap); 2852 if (!ret) 2853 err = ret; 2854 } 2855 } 2856 rcu_read_unlock(); 2857 return err; 2858 } 2859 EXPORT_SYMBOL(km_migrate); 2860 #endif 2861 2862 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2863 { 2864 int err = -EINVAL; 2865 int ret; 2866 struct xfrm_mgr *km; 2867 2868 rcu_read_lock(); 2869 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2870 if (km->report) { 2871 ret = km->report(net, proto, sel, addr); 2872 if (!ret) 2873 err = ret; 2874 } 2875 } 2876 rcu_read_unlock(); 2877 return err; 2878 } 2879 EXPORT_SYMBOL(km_report); 2880 2881 static bool km_is_alive(const struct km_event *c) 2882 { 2883 struct xfrm_mgr *km; 2884 bool is_alive = false; 2885 2886 rcu_read_lock(); 2887 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2888 if (km->is_alive && km->is_alive(c)) { 2889 is_alive = true; 2890 break; 2891 } 2892 } 2893 rcu_read_unlock(); 2894 2895 return is_alive; 2896 } 2897 2898 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2899 static DEFINE_SPINLOCK(xfrm_translator_lock); 2900 static struct xfrm_translator __rcu *xfrm_translator; 2901 2902 struct xfrm_translator *xfrm_get_translator(void) 2903 { 2904 struct xfrm_translator *xtr; 2905 2906 rcu_read_lock(); 2907 xtr = rcu_dereference(xfrm_translator); 2908 if (unlikely(!xtr)) 2909 goto out; 2910 if (!try_module_get(xtr->owner)) 2911 xtr = NULL; 2912 out: 2913 rcu_read_unlock(); 2914 return xtr; 2915 } 2916 EXPORT_SYMBOL_GPL(xfrm_get_translator); 2917 2918 void xfrm_put_translator(struct xfrm_translator *xtr) 2919 { 2920 module_put(xtr->owner); 2921 } 2922 EXPORT_SYMBOL_GPL(xfrm_put_translator); 2923 2924 int xfrm_register_translator(struct xfrm_translator *xtr) 2925 { 2926 int err = 0; 2927 2928 spin_lock_bh(&xfrm_translator_lock); 2929 if (unlikely(xfrm_translator != NULL)) 2930 err = -EEXIST; 2931 else 2932 rcu_assign_pointer(xfrm_translator, xtr); 2933 spin_unlock_bh(&xfrm_translator_lock); 2934 2935 return err; 2936 } 2937 EXPORT_SYMBOL_GPL(xfrm_register_translator); 2938 2939 int xfrm_unregister_translator(struct xfrm_translator *xtr) 2940 { 2941 int err = 0; 2942 2943 spin_lock_bh(&xfrm_translator_lock); 2944 if (likely(xfrm_translator != NULL)) { 2945 if (rcu_access_pointer(xfrm_translator) != xtr) 2946 err = -EINVAL; 2947 else 2948 RCU_INIT_POINTER(xfrm_translator, NULL); 2949 } 2950 spin_unlock_bh(&xfrm_translator_lock); 2951 synchronize_rcu(); 2952 2953 return err; 2954 } 2955 EXPORT_SYMBOL_GPL(xfrm_unregister_translator); 2956 #endif 2957 2958 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen) 2959 { 2960 int err; 2961 u8 *data; 2962 struct xfrm_mgr *km; 2963 struct xfrm_policy *pol = NULL; 2964 2965 if (sockptr_is_null(optval) && !optlen) { 2966 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2967 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2968 __sk_dst_reset(sk); 2969 return 0; 2970 } 2971 2972 if (optlen <= 0 || optlen > PAGE_SIZE) 2973 return -EMSGSIZE; 2974 2975 data = memdup_sockptr(optval, optlen); 2976 if (IS_ERR(data)) 2977 return PTR_ERR(data); 2978 2979 if (in_compat_syscall()) { 2980 struct xfrm_translator *xtr = xfrm_get_translator(); 2981 2982 if (!xtr) { 2983 kfree(data); 2984 return -EOPNOTSUPP; 2985 } 2986 2987 err = xtr->xlate_user_policy_sockptr(&data, optlen); 2988 xfrm_put_translator(xtr); 2989 if (err) { 2990 kfree(data); 2991 return err; 2992 } 2993 } 2994 2995 err = -EINVAL; 2996 rcu_read_lock(); 2997 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2998 pol = km->compile_policy(sk, optname, data, 2999 optlen, &err); 3000 if (err >= 0) 3001 break; 3002 } 3003 rcu_read_unlock(); 3004 3005 if (err >= 0) { 3006 xfrm_sk_policy_insert(sk, err, pol); 3007 xfrm_pol_put(pol); 3008 __sk_dst_reset(sk); 3009 err = 0; 3010 } 3011 3012 kfree(data); 3013 return err; 3014 } 3015 EXPORT_SYMBOL(xfrm_user_policy); 3016 3017 static DEFINE_SPINLOCK(xfrm_km_lock); 3018 3019 void xfrm_register_km(struct xfrm_mgr *km) 3020 { 3021 spin_lock_bh(&xfrm_km_lock); 3022 list_add_tail_rcu(&km->list, &xfrm_km_list); 3023 spin_unlock_bh(&xfrm_km_lock); 3024 } 3025 EXPORT_SYMBOL(xfrm_register_km); 3026 3027 void xfrm_unregister_km(struct xfrm_mgr *km) 3028 { 3029 spin_lock_bh(&xfrm_km_lock); 3030 list_del_rcu(&km->list); 3031 spin_unlock_bh(&xfrm_km_lock); 3032 synchronize_rcu(); 3033 } 3034 EXPORT_SYMBOL(xfrm_unregister_km); 3035 3036 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 3037 { 3038 int err = 0; 3039 3040 if (WARN_ON(afinfo->family >= NPROTO)) 3041 return -EAFNOSUPPORT; 3042 3043 spin_lock_bh(&xfrm_state_afinfo_lock); 3044 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 3045 err = -EEXIST; 3046 else 3047 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 3048 spin_unlock_bh(&xfrm_state_afinfo_lock); 3049 return err; 3050 } 3051 EXPORT_SYMBOL(xfrm_state_register_afinfo); 3052 3053 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 3054 { 3055 int err = 0, family = afinfo->family; 3056 3057 if (WARN_ON(family >= NPROTO)) 3058 return -EAFNOSUPPORT; 3059 3060 spin_lock_bh(&xfrm_state_afinfo_lock); 3061 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 3062 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 3063 err = -EINVAL; 3064 else 3065 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 3066 } 3067 spin_unlock_bh(&xfrm_state_afinfo_lock); 3068 synchronize_rcu(); 3069 return err; 3070 } 3071 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 3072 3073 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 3074 { 3075 if (unlikely(family >= NPROTO)) 3076 return NULL; 3077 3078 return rcu_dereference(xfrm_state_afinfo[family]); 3079 } 3080 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); 3081 3082 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 3083 { 3084 struct xfrm_state_afinfo *afinfo; 3085 if (unlikely(family >= NPROTO)) 3086 return NULL; 3087 rcu_read_lock(); 3088 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 3089 if (unlikely(!afinfo)) 3090 rcu_read_unlock(); 3091 return afinfo; 3092 } 3093 3094 void xfrm_flush_gc(void) 3095 { 3096 flush_work(&xfrm_state_gc_work); 3097 } 3098 EXPORT_SYMBOL(xfrm_flush_gc); 3099 3100 static void xfrm_state_delete_tunnel(struct xfrm_state *x) 3101 { 3102 if (x->tunnel) { 3103 struct xfrm_state *t = x->tunnel; 3104 3105 if (atomic_dec_return(&t->tunnel_users) == 1) 3106 xfrm_state_delete(t); 3107 xfrm_state_put(t); 3108 x->tunnel = NULL; 3109 } 3110 } 3111 3112 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) 3113 { 3114 const struct xfrm_type *type = READ_ONCE(x->type); 3115 struct crypto_aead *aead; 3116 u32 blksize, net_adj = 0; 3117 3118 if (x->km.state != XFRM_STATE_VALID || 3119 !type || type->proto != IPPROTO_ESP) 3120 return mtu - x->props.header_len; 3121 3122 aead = x->data; 3123 blksize = ALIGN(crypto_aead_blocksize(aead), 4); 3124 3125 switch (x->props.mode) { 3126 case XFRM_MODE_TRANSPORT: 3127 case XFRM_MODE_BEET: 3128 if (x->props.family == AF_INET) 3129 net_adj = sizeof(struct iphdr); 3130 else if (x->props.family == AF_INET6) 3131 net_adj = sizeof(struct ipv6hdr); 3132 break; 3133 case XFRM_MODE_TUNNEL: 3134 break; 3135 default: 3136 if (x->mode_cbs && x->mode_cbs->get_inner_mtu) 3137 return x->mode_cbs->get_inner_mtu(x, mtu); 3138 3139 WARN_ON_ONCE(1); 3140 break; 3141 } 3142 3143 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - 3144 net_adj) & ~(blksize - 1)) + net_adj - 2; 3145 } 3146 EXPORT_SYMBOL_GPL(xfrm_state_mtu); 3147 3148 int __xfrm_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) 3149 { 3150 const struct xfrm_mode *inner_mode; 3151 const struct xfrm_mode *outer_mode; 3152 int family = x->props.family; 3153 int err; 3154 3155 if (family == AF_INET && 3156 (!x->dir || x->dir == XFRM_SA_DIR_OUT) && 3157 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)) 3158 x->props.flags |= XFRM_STATE_NOPMTUDISC; 3159 3160 err = -EPROTONOSUPPORT; 3161 3162 if (x->sel.family != AF_UNSPEC) { 3163 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 3164 if (inner_mode == NULL) { 3165 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3166 goto error; 3167 } 3168 3169 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 3170 family != x->sel.family) { 3171 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family"); 3172 goto error; 3173 } 3174 3175 x->inner_mode = *inner_mode; 3176 } else { 3177 const struct xfrm_mode *inner_mode_iaf; 3178 int iafamily = AF_INET; 3179 3180 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 3181 if (inner_mode == NULL) { 3182 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3183 goto error; 3184 } 3185 3186 x->inner_mode = *inner_mode; 3187 3188 if (x->props.family == AF_INET) 3189 iafamily = AF_INET6; 3190 3191 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 3192 if (inner_mode_iaf) { 3193 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 3194 x->inner_mode_iaf = *inner_mode_iaf; 3195 } 3196 } 3197 3198 x->type = xfrm_get_type(x->id.proto, family); 3199 if (x->type == NULL) { 3200 NL_SET_ERR_MSG(extack, "Requested type not found"); 3201 goto error; 3202 } 3203 3204 err = x->type->init_state(x, extack); 3205 if (err) 3206 goto error; 3207 3208 outer_mode = xfrm_get_mode(x->props.mode, family); 3209 if (!outer_mode) { 3210 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3211 err = -EPROTONOSUPPORT; 3212 goto error; 3213 } 3214 3215 x->outer_mode = *outer_mode; 3216 if (x->nat_keepalive_interval) { 3217 if (x->dir != XFRM_SA_DIR_OUT) { 3218 NL_SET_ERR_MSG(extack, "NAT keepalive is only supported for outbound SAs"); 3219 err = -EINVAL; 3220 goto error; 3221 } 3222 3223 if (!x->encap || x->encap->encap_type != UDP_ENCAP_ESPINUDP) { 3224 NL_SET_ERR_MSG(extack, 3225 "NAT keepalive is only supported for UDP encapsulation"); 3226 err = -EINVAL; 3227 goto error; 3228 } 3229 } 3230 3231 x->mode_cbs = xfrm_get_mode_cbs(x->props.mode); 3232 if (x->mode_cbs) { 3233 if (x->mode_cbs->init_state) 3234 err = x->mode_cbs->init_state(x); 3235 module_put(x->mode_cbs->owner); 3236 } 3237 error: 3238 return err; 3239 } 3240 3241 EXPORT_SYMBOL(__xfrm_init_state); 3242 3243 int xfrm_init_state(struct xfrm_state *x) 3244 { 3245 int err; 3246 3247 err = __xfrm_init_state(x, NULL); 3248 if (err) 3249 return err; 3250 3251 err = xfrm_init_replay(x, NULL); 3252 if (err) 3253 return err; 3254 3255 x->km.state = XFRM_STATE_VALID; 3256 return 0; 3257 } 3258 3259 EXPORT_SYMBOL(xfrm_init_state); 3260 3261 int __net_init xfrm_state_init(struct net *net) 3262 { 3263 struct hlist_head *ndst, *nsrc, *nspi, *nseq; 3264 unsigned int sz; 3265 3266 if (net_eq(net, &init_net)) 3267 xfrm_state_cache = KMEM_CACHE(xfrm_state, 3268 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 3269 3270 INIT_LIST_HEAD(&net->xfrm.state_all); 3271 3272 sz = sizeof(struct hlist_head) * 8; 3273 3274 ndst = xfrm_hash_alloc(sz); 3275 if (!ndst) 3276 goto out_bydst; 3277 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 3278 3279 nsrc = xfrm_hash_alloc(sz); 3280 if (!nsrc) 3281 goto out_bysrc; 3282 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 3283 3284 nspi = xfrm_hash_alloc(sz); 3285 if (!nspi) 3286 goto out_byspi; 3287 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 3288 3289 nseq = xfrm_hash_alloc(sz); 3290 if (!nseq) 3291 goto out_byseq; 3292 rcu_assign_pointer(net->xfrm.state_byseq, nseq); 3293 3294 net->xfrm.state_cache_input = alloc_percpu(struct hlist_head); 3295 if (!net->xfrm.state_cache_input) 3296 goto out_state_cache_input; 3297 3298 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 3299 3300 net->xfrm.state_num = 0; 3301 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 3302 spin_lock_init(&net->xfrm.xfrm_state_lock); 3303 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation, 3304 &net->xfrm.xfrm_state_lock); 3305 return 0; 3306 3307 out_state_cache_input: 3308 xfrm_hash_free(nseq, sz); 3309 out_byseq: 3310 xfrm_hash_free(nspi, sz); 3311 out_byspi: 3312 xfrm_hash_free(nsrc, sz); 3313 out_bysrc: 3314 xfrm_hash_free(ndst, sz); 3315 out_bydst: 3316 return -ENOMEM; 3317 } 3318 3319 #define xfrm_state_deref_netexit(table) \ 3320 rcu_dereference_protected((table), true /* netns is going away */) 3321 void xfrm_state_fini(struct net *net) 3322 { 3323 unsigned int sz; 3324 int i; 3325 3326 flush_work(&net->xfrm.state_hash_work); 3327 xfrm_state_flush(net, 0, false); 3328 flush_work(&xfrm_state_gc_work); 3329 3330 WARN_ON(!list_empty(&net->xfrm.state_all)); 3331 3332 for (i = 0; i <= net->xfrm.state_hmask; i++) { 3333 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_byseq) + i)); 3334 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_byspi) + i)); 3335 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_bysrc) + i)); 3336 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_bydst) + i)); 3337 } 3338 3339 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 3340 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_byseq), sz); 3341 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_byspi), sz); 3342 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_bysrc), sz); 3343 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_bydst), sz); 3344 free_percpu(net->xfrm.state_cache_input); 3345 } 3346 3347 #ifdef CONFIG_AUDITSYSCALL 3348 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 3349 struct audit_buffer *audit_buf) 3350 { 3351 struct xfrm_sec_ctx *ctx = x->security; 3352 u32 spi = ntohl(x->id.spi); 3353 3354 if (ctx) 3355 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 3356 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 3357 3358 switch (x->props.family) { 3359 case AF_INET: 3360 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3361 &x->props.saddr.a4, &x->id.daddr.a4); 3362 break; 3363 case AF_INET6: 3364 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 3365 x->props.saddr.a6, x->id.daddr.a6); 3366 break; 3367 } 3368 3369 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3370 } 3371 3372 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 3373 struct audit_buffer *audit_buf) 3374 { 3375 const struct iphdr *iph4; 3376 const struct ipv6hdr *iph6; 3377 3378 switch (family) { 3379 case AF_INET: 3380 iph4 = ip_hdr(skb); 3381 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3382 &iph4->saddr, &iph4->daddr); 3383 break; 3384 case AF_INET6: 3385 iph6 = ipv6_hdr(skb); 3386 audit_log_format(audit_buf, 3387 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 3388 &iph6->saddr, &iph6->daddr, 3389 iph6->flow_lbl[0] & 0x0f, 3390 iph6->flow_lbl[1], 3391 iph6->flow_lbl[2]); 3392 break; 3393 } 3394 } 3395 3396 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 3397 { 3398 struct audit_buffer *audit_buf; 3399 3400 audit_buf = xfrm_audit_start("SAD-add"); 3401 if (audit_buf == NULL) 3402 return; 3403 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3404 xfrm_audit_helper_sainfo(x, audit_buf); 3405 audit_log_format(audit_buf, " res=%u", result); 3406 audit_log_end(audit_buf); 3407 } 3408 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 3409 3410 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 3411 { 3412 struct audit_buffer *audit_buf; 3413 3414 audit_buf = xfrm_audit_start("SAD-delete"); 3415 if (audit_buf == NULL) 3416 return; 3417 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3418 xfrm_audit_helper_sainfo(x, audit_buf); 3419 audit_log_format(audit_buf, " res=%u", result); 3420 audit_log_end(audit_buf); 3421 } 3422 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 3423 3424 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 3425 struct sk_buff *skb) 3426 { 3427 struct audit_buffer *audit_buf; 3428 u32 spi; 3429 3430 audit_buf = xfrm_audit_start("SA-replay-overflow"); 3431 if (audit_buf == NULL) 3432 return; 3433 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3434 /* don't record the sequence number because it's inherent in this kind 3435 * of audit message */ 3436 spi = ntohl(x->id.spi); 3437 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3438 audit_log_end(audit_buf); 3439 } 3440 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 3441 3442 void xfrm_audit_state_replay(struct xfrm_state *x, 3443 struct sk_buff *skb, __be32 net_seq) 3444 { 3445 struct audit_buffer *audit_buf; 3446 u32 spi; 3447 3448 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 3449 if (audit_buf == NULL) 3450 return; 3451 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3452 spi = ntohl(x->id.spi); 3453 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3454 spi, spi, ntohl(net_seq)); 3455 audit_log_end(audit_buf); 3456 } 3457 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 3458 3459 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 3460 { 3461 struct audit_buffer *audit_buf; 3462 3463 audit_buf = xfrm_audit_start("SA-notfound"); 3464 if (audit_buf == NULL) 3465 return; 3466 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3467 audit_log_end(audit_buf); 3468 } 3469 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 3470 3471 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 3472 __be32 net_spi, __be32 net_seq) 3473 { 3474 struct audit_buffer *audit_buf; 3475 u32 spi; 3476 3477 audit_buf = xfrm_audit_start("SA-notfound"); 3478 if (audit_buf == NULL) 3479 return; 3480 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3481 spi = ntohl(net_spi); 3482 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3483 spi, spi, ntohl(net_seq)); 3484 audit_log_end(audit_buf); 3485 } 3486 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 3487 3488 void xfrm_audit_state_icvfail(struct xfrm_state *x, 3489 struct sk_buff *skb, u8 proto) 3490 { 3491 struct audit_buffer *audit_buf; 3492 __be32 net_spi; 3493 __be32 net_seq; 3494 3495 audit_buf = xfrm_audit_start("SA-icv-failure"); 3496 if (audit_buf == NULL) 3497 return; 3498 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3499 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 3500 u32 spi = ntohl(net_spi); 3501 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3502 spi, spi, ntohl(net_seq)); 3503 } 3504 audit_log_end(audit_buf); 3505 } 3506 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 3507 #endif /* CONFIG_AUDITSYSCALL */ 3508