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_init_rcu(&x->bydst); 822 hlist_del_init_rcu(&x->bysrc); 823 if (!hlist_unhashed(&x->byseq)) 824 hlist_del_init_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 (!hlist_unhashed(&x->byspi)) 831 hlist_del_init_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 /* BH is always disabled on the input path. */ 1211 lockdep_assert_in_softirq(); 1212 1213 state_cache_input = raw_cpu_ptr(net->xfrm.state_cache_input); 1214 1215 hlist_for_each_entry_rcu(x, state_cache_input, state_cache_input) { 1216 if (x->props.family != family || 1217 x->id.spi != spi || 1218 x->id.proto != proto || 1219 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 1220 continue; 1221 1222 if ((mark & x->mark.m) != x->mark.v) 1223 continue; 1224 if (!xfrm_state_hold_rcu(x)) 1225 continue; 1226 goto out; 1227 } 1228 1229 xfrm_hash_ptrs_get(net, &state_ptrs); 1230 1231 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 1232 if (x) { 1233 spin_lock(&net->xfrm.xfrm_state_lock); 1234 if (x->km.state != XFRM_STATE_VALID) { 1235 /* 1236 * The state is about to be destroyed. 1237 * 1238 * Don't add it to the cache but still 1239 * return it to the caller. 1240 */ 1241 } else if (hlist_unhashed(&x->state_cache_input)) { 1242 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1243 } else { 1244 hlist_del_rcu(&x->state_cache_input); 1245 hlist_add_head_rcu(&x->state_cache_input, state_cache_input); 1246 } 1247 spin_unlock(&net->xfrm.xfrm_state_lock); 1248 } 1249 1250 out: 1251 return x; 1252 } 1253 EXPORT_SYMBOL(xfrm_input_state_lookup); 1254 1255 static struct xfrm_state *__xfrm_state_lookup_byaddr(const struct xfrm_hash_state_ptrs *state_ptrs, 1256 u32 mark, 1257 const xfrm_address_t *daddr, 1258 const xfrm_address_t *saddr, 1259 u8 proto, unsigned short family) 1260 { 1261 unsigned int h = __xfrm_src_hash(daddr, saddr, family, state_ptrs->hmask); 1262 struct xfrm_state *x; 1263 1264 hlist_for_each_entry_rcu(x, state_ptrs->bysrc + h, bysrc) { 1265 if (x->props.family != family || 1266 x->id.proto != proto || 1267 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1268 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1269 continue; 1270 1271 if ((mark & x->mark.m) != x->mark.v) 1272 continue; 1273 if (!xfrm_state_hold_rcu(x)) 1274 continue; 1275 return x; 1276 } 1277 1278 return NULL; 1279 } 1280 1281 static inline struct xfrm_state * 1282 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 1283 { 1284 struct xfrm_hash_state_ptrs state_ptrs; 1285 struct net *net = xs_net(x); 1286 u32 mark = x->mark.v & x->mark.m; 1287 1288 xfrm_hash_ptrs_get(net, &state_ptrs); 1289 1290 if (use_spi) 1291 return __xfrm_state_lookup(&state_ptrs, mark, &x->id.daddr, 1292 x->id.spi, x->id.proto, family); 1293 else 1294 return __xfrm_state_lookup_byaddr(&state_ptrs, mark, 1295 &x->id.daddr, 1296 &x->props.saddr, 1297 x->id.proto, family); 1298 } 1299 1300 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 1301 { 1302 if (have_hash_collision && 1303 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 1304 net->xfrm.state_num > net->xfrm.state_hmask) 1305 schedule_work(&net->xfrm.state_hash_work); 1306 } 1307 1308 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 1309 const struct flowi *fl, unsigned short family, 1310 struct xfrm_state **best, int *acq_in_progress, 1311 int *error, unsigned int pcpu_id) 1312 { 1313 /* Resolution logic: 1314 * 1. There is a valid state with matching selector. Done. 1315 * 2. Valid state with inappropriate selector. Skip. 1316 * 1317 * Entering area of "sysdeps". 1318 * 1319 * 3. If state is not valid, selector is temporary, it selects 1320 * only session which triggered previous resolution. Key 1321 * manager will do something to install a state with proper 1322 * selector. 1323 */ 1324 if (x->km.state == XFRM_STATE_VALID) { 1325 if ((x->sel.family && 1326 (x->sel.family != family || 1327 !xfrm_selector_match(&x->sel, fl, family))) || 1328 !security_xfrm_state_pol_flow_match(x, pol, 1329 &fl->u.__fl_common)) 1330 return; 1331 1332 if (x->pcpu_num != UINT_MAX && x->pcpu_num != pcpu_id) 1333 return; 1334 1335 if (!*best || 1336 ((*best)->pcpu_num == UINT_MAX && x->pcpu_num == pcpu_id) || 1337 (*best)->km.dying > x->km.dying || 1338 ((*best)->km.dying == x->km.dying && 1339 (*best)->curlft.add_time < x->curlft.add_time)) 1340 *best = x; 1341 } else if (x->km.state == XFRM_STATE_ACQ) { 1342 if (!*best || x->pcpu_num == pcpu_id) 1343 *acq_in_progress = 1; 1344 } else if (x->km.state == XFRM_STATE_ERROR || 1345 x->km.state == XFRM_STATE_EXPIRED) { 1346 if ((!x->sel.family || 1347 (x->sel.family == family && 1348 xfrm_selector_match(&x->sel, fl, family))) && 1349 security_xfrm_state_pol_flow_match(x, pol, 1350 &fl->u.__fl_common)) 1351 *error = -ESRCH; 1352 } 1353 } 1354 1355 struct xfrm_state * 1356 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1357 const struct flowi *fl, struct xfrm_tmpl *tmpl, 1358 struct xfrm_policy *pol, int *err, 1359 unsigned short family, u32 if_id) 1360 { 1361 static xfrm_address_t saddr_wildcard = { }; 1362 struct xfrm_hash_state_ptrs state_ptrs; 1363 struct net *net = xp_net(pol); 1364 unsigned int h, h_wildcard; 1365 struct xfrm_state *x, *x0, *to_put; 1366 int acquire_in_progress = 0; 1367 int error = 0; 1368 struct xfrm_state *best = NULL; 1369 u32 mark = pol->mark.v & pol->mark.m; 1370 unsigned short encap_family = tmpl->encap_family; 1371 unsigned int sequence; 1372 struct km_event c; 1373 unsigned int pcpu_id; 1374 bool cached = false; 1375 1376 /* We need the cpu id just as a lookup key, 1377 * we don't require it to be stable. 1378 */ 1379 pcpu_id = raw_smp_processor_id(); 1380 1381 to_put = NULL; 1382 1383 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); 1384 1385 rcu_read_lock(); 1386 xfrm_hash_ptrs_get(net, &state_ptrs); 1387 1388 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1389 if (x->props.family == encap_family && 1390 x->props.reqid == tmpl->reqid && 1391 (mark & x->mark.m) == x->mark.v && 1392 x->if_id == if_id && 1393 !(x->props.flags & XFRM_STATE_WILDRECV) && 1394 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1395 tmpl->mode == x->props.mode && 1396 tmpl->id.proto == x->id.proto && 1397 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1398 xfrm_state_look_at(pol, x, fl, encap_family, 1399 &best, &acquire_in_progress, &error, pcpu_id); 1400 } 1401 1402 if (best) 1403 goto cached; 1404 1405 hlist_for_each_entry_rcu(x, &pol->state_cache_list, state_cache) { 1406 if (x->props.family == encap_family && 1407 x->props.reqid == tmpl->reqid && 1408 (mark & x->mark.m) == x->mark.v && 1409 x->if_id == if_id && 1410 !(x->props.flags & XFRM_STATE_WILDRECV) && 1411 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1412 tmpl->mode == x->props.mode && 1413 tmpl->id.proto == x->id.proto && 1414 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1415 xfrm_state_look_at(pol, x, fl, family, 1416 &best, &acquire_in_progress, &error, pcpu_id); 1417 } 1418 1419 cached: 1420 cached = true; 1421 if (best) 1422 goto found; 1423 else if (error) 1424 best = NULL; 1425 else if (acquire_in_progress) /* XXX: acquire_in_progress should not happen */ 1426 WARN_ON(1); 1427 1428 h = __xfrm_dst_hash(daddr, saddr, tmpl->reqid, encap_family, state_ptrs.hmask); 1429 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h, bydst) { 1430 #ifdef CONFIG_XFRM_OFFLOAD 1431 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1432 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1433 /* HW states are in the head of list, there is 1434 * no need to iterate further. 1435 */ 1436 break; 1437 1438 /* Packet offload: both policy and SA should 1439 * have same device. 1440 */ 1441 if (pol->xdo.dev != x->xso.dev) 1442 continue; 1443 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1444 /* Skip HW policy for SW lookups */ 1445 continue; 1446 #endif 1447 if (x->props.family == encap_family && 1448 x->props.reqid == tmpl->reqid && 1449 (mark & x->mark.m) == x->mark.v && 1450 x->if_id == if_id && 1451 !(x->props.flags & XFRM_STATE_WILDRECV) && 1452 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 1453 tmpl->mode == x->props.mode && 1454 tmpl->id.proto == x->id.proto && 1455 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1456 xfrm_state_look_at(pol, x, fl, family, 1457 &best, &acquire_in_progress, &error, pcpu_id); 1458 } 1459 if (best || acquire_in_progress) 1460 goto found; 1461 1462 h_wildcard = __xfrm_dst_hash(daddr, &saddr_wildcard, tmpl->reqid, 1463 encap_family, state_ptrs.hmask); 1464 hlist_for_each_entry_rcu(x, state_ptrs.bydst + h_wildcard, bydst) { 1465 #ifdef CONFIG_XFRM_OFFLOAD 1466 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1467 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1468 /* HW states are in the head of list, there is 1469 * no need to iterate further. 1470 */ 1471 break; 1472 1473 /* Packet offload: both policy and SA should 1474 * have same device. 1475 */ 1476 if (pol->xdo.dev != x->xso.dev) 1477 continue; 1478 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1479 /* Skip HW policy for SW lookups */ 1480 continue; 1481 #endif 1482 if (x->props.family == encap_family && 1483 x->props.reqid == tmpl->reqid && 1484 (mark & x->mark.m) == x->mark.v && 1485 x->if_id == if_id && 1486 !(x->props.flags & XFRM_STATE_WILDRECV) && 1487 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 1488 tmpl->mode == x->props.mode && 1489 tmpl->id.proto == x->id.proto && 1490 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 1491 xfrm_state_look_at(pol, x, fl, family, 1492 &best, &acquire_in_progress, &error, pcpu_id); 1493 } 1494 1495 found: 1496 if (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || 1497 (best && (best->pcpu_num == pcpu_id))) 1498 x = best; 1499 1500 if (!x && !error && !acquire_in_progress) { 1501 if (tmpl->id.spi && 1502 (x0 = __xfrm_state_lookup_all(&state_ptrs, mark, daddr, 1503 tmpl->id.spi, tmpl->id.proto, 1504 encap_family, 1505 &pol->xdo)) != NULL) { 1506 to_put = x0; 1507 error = -EEXIST; 1508 goto out; 1509 } 1510 1511 c.net = net; 1512 /* If the KMs have no listeners (yet...), avoid allocating an SA 1513 * for each and every packet - garbage collection might not 1514 * handle the flood. 1515 */ 1516 if (!km_is_alive(&c)) { 1517 error = -ESRCH; 1518 goto out; 1519 } 1520 1521 x = xfrm_state_alloc(net); 1522 if (x == NULL) { 1523 error = -ENOMEM; 1524 goto out; 1525 } 1526 /* Initialize temporary state matching only 1527 * to current session. */ 1528 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1529 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1530 x->if_id = if_id; 1531 if ((pol->flags & XFRM_POLICY_CPU_ACQUIRE) && best) 1532 x->pcpu_num = pcpu_id; 1533 1534 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1535 if (error) { 1536 x->km.state = XFRM_STATE_DEAD; 1537 to_put = x; 1538 x = NULL; 1539 goto out; 1540 } 1541 #ifdef CONFIG_XFRM_OFFLOAD 1542 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) { 1543 struct xfrm_dev_offload *xdo = &pol->xdo; 1544 struct xfrm_dev_offload *xso = &x->xso; 1545 struct net_device *dev = xdo->dev; 1546 1547 xso->type = XFRM_DEV_OFFLOAD_PACKET; 1548 xso->dir = xdo->dir; 1549 xso->dev = dev; 1550 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ; 1551 netdev_hold(dev, &xso->dev_tracker, GFP_ATOMIC); 1552 error = dev->xfrmdev_ops->xdo_dev_state_add(dev, x, 1553 NULL); 1554 if (error) { 1555 xso->dir = 0; 1556 netdev_put(dev, &xso->dev_tracker); 1557 xso->dev = NULL; 1558 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 1559 x->km.state = XFRM_STATE_DEAD; 1560 to_put = x; 1561 x = NULL; 1562 goto out; 1563 } 1564 } 1565 #endif 1566 if (km_query(x, tmpl, pol) == 0) { 1567 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1568 x->km.state = XFRM_STATE_ACQ; 1569 x->dir = XFRM_SA_DIR_OUT; 1570 list_add(&x->km.all, &net->xfrm.state_all); 1571 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 1572 XFRM_STATE_INSERT(bydst, &x->bydst, 1573 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1574 x->xso.type); 1575 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1576 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1577 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1578 x->xso.type); 1579 INIT_HLIST_NODE(&x->state_cache); 1580 if (x->id.spi) { 1581 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1582 XFRM_STATE_INSERT(byspi, &x->byspi, 1583 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 1584 x->xso.type); 1585 } 1586 if (x->km.seq) { 1587 h = xfrm_seq_hash(net, x->km.seq); 1588 XFRM_STATE_INSERT(byseq, &x->byseq, 1589 xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, 1590 x->xso.type); 1591 } 1592 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1593 hrtimer_start(&x->mtimer, 1594 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1595 HRTIMER_MODE_REL_SOFT); 1596 net->xfrm.state_num++; 1597 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1598 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1599 } else { 1600 #ifdef CONFIG_XFRM_OFFLOAD 1601 struct xfrm_dev_offload *xso = &x->xso; 1602 1603 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) { 1604 xfrm_dev_state_delete(x); 1605 xfrm_dev_state_free(x); 1606 } 1607 #endif 1608 x->km.state = XFRM_STATE_DEAD; 1609 to_put = x; 1610 x = NULL; 1611 error = -ESRCH; 1612 } 1613 1614 /* Use the already installed 'fallback' while the CPU-specific 1615 * SA acquire is handled*/ 1616 if (best) 1617 x = best; 1618 } 1619 out: 1620 if (x) { 1621 if (!xfrm_state_hold_rcu(x)) { 1622 *err = -EAGAIN; 1623 x = NULL; 1624 } 1625 } else { 1626 *err = acquire_in_progress ? -EAGAIN : error; 1627 } 1628 1629 if (x && x->km.state == XFRM_STATE_VALID && !cached && 1630 (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || x->pcpu_num == pcpu_id)) { 1631 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1632 if (hlist_unhashed(&x->state_cache)) 1633 hlist_add_head_rcu(&x->state_cache, &pol->state_cache_list); 1634 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1635 } 1636 1637 rcu_read_unlock(); 1638 if (to_put) 1639 xfrm_state_put(to_put); 1640 1641 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) { 1642 *err = -EAGAIN; 1643 if (x) { 1644 xfrm_state_put(x); 1645 x = NULL; 1646 } 1647 } 1648 1649 return x; 1650 } 1651 1652 struct xfrm_state * 1653 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1654 xfrm_address_t *daddr, xfrm_address_t *saddr, 1655 unsigned short family, u8 mode, u8 proto, u32 reqid) 1656 { 1657 unsigned int h; 1658 struct xfrm_state *rx = NULL, *x = NULL; 1659 1660 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1661 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1662 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1663 if (x->props.family == family && 1664 x->props.reqid == reqid && 1665 (mark & x->mark.m) == x->mark.v && 1666 x->if_id == if_id && 1667 !(x->props.flags & XFRM_STATE_WILDRECV) && 1668 xfrm_state_addr_check(x, daddr, saddr, family) && 1669 mode == x->props.mode && 1670 proto == x->id.proto && 1671 x->km.state == XFRM_STATE_VALID) { 1672 rx = x; 1673 break; 1674 } 1675 } 1676 1677 if (rx) 1678 xfrm_state_hold(rx); 1679 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1680 1681 1682 return rx; 1683 } 1684 EXPORT_SYMBOL(xfrm_stateonly_find); 1685 1686 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1687 unsigned short family) 1688 { 1689 struct xfrm_state *x; 1690 struct xfrm_state_walk *w; 1691 1692 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1693 list_for_each_entry(w, &net->xfrm.state_all, all) { 1694 x = container_of(w, struct xfrm_state, km); 1695 if (x->props.family != family || 1696 x->id.spi != spi) 1697 continue; 1698 1699 xfrm_state_hold(x); 1700 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1701 return x; 1702 } 1703 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1704 return NULL; 1705 } 1706 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1707 1708 static struct xfrm_state *xfrm_state_lookup_spi_proto(struct net *net, __be32 spi, u8 proto) 1709 { 1710 struct xfrm_state *x; 1711 unsigned int i; 1712 1713 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1714 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_byspi, net) + i, byspi) { 1715 if (x->id.spi == spi && x->id.proto == proto) 1716 return x; 1717 } 1718 } 1719 return NULL; 1720 } 1721 1722 static void __xfrm_state_insert(struct xfrm_state *x) 1723 { 1724 struct net *net = xs_net(x); 1725 unsigned int h; 1726 1727 list_add(&x->km.all, &net->xfrm.state_all); 1728 1729 /* Sanitize mark before store */ 1730 x->mark.v &= x->mark.m; 1731 1732 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1733 x->props.reqid, x->props.family); 1734 XFRM_STATE_INSERT(bydst, &x->bydst, 1735 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1736 x->xso.type); 1737 1738 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1739 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1740 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1741 x->xso.type); 1742 1743 if (x->id.spi) { 1744 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1745 x->props.family); 1746 1747 XFRM_STATE_INSERT(byspi, &x->byspi, 1748 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 1749 x->xso.type); 1750 } 1751 1752 if (x->km.seq) { 1753 h = xfrm_seq_hash(net, x->km.seq); 1754 1755 XFRM_STATE_INSERT(byseq, &x->byseq, 1756 xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, 1757 x->xso.type); 1758 } 1759 1760 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); 1761 if (x->replay_maxage) 1762 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1763 1764 net->xfrm.state_num++; 1765 1766 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1767 xfrm_nat_keepalive_state_updated(x); 1768 } 1769 1770 /* net->xfrm.xfrm_state_lock is held */ 1771 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1772 { 1773 struct net *net = xs_net(xnew); 1774 unsigned short family = xnew->props.family; 1775 u32 reqid = xnew->props.reqid; 1776 struct xfrm_state *x; 1777 unsigned int h; 1778 u32 mark = xnew->mark.v & xnew->mark.m; 1779 u32 if_id = xnew->if_id; 1780 u32 cpu_id = xnew->pcpu_num; 1781 1782 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1783 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1784 if (x->props.family == family && 1785 x->props.reqid == reqid && 1786 x->if_id == if_id && 1787 x->pcpu_num == cpu_id && 1788 (mark & x->mark.m) == x->mark.v && 1789 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1790 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1791 x->genid++; 1792 } 1793 } 1794 1795 void xfrm_state_insert(struct xfrm_state *x) 1796 { 1797 struct net *net = xs_net(x); 1798 1799 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1800 __xfrm_state_bump_genids(x); 1801 __xfrm_state_insert(x); 1802 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1803 } 1804 EXPORT_SYMBOL(xfrm_state_insert); 1805 1806 /* net->xfrm.xfrm_state_lock is held */ 1807 static struct xfrm_state *__find_acq_core(struct net *net, 1808 const struct xfrm_mark *m, 1809 unsigned short family, u8 mode, 1810 u32 reqid, u32 if_id, u32 pcpu_num, u8 proto, 1811 const xfrm_address_t *daddr, 1812 const xfrm_address_t *saddr, 1813 int create) 1814 { 1815 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1816 struct xfrm_state *x; 1817 u32 mark = m->v & m->m; 1818 1819 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 1820 if (x->props.reqid != reqid || 1821 x->props.mode != mode || 1822 x->props.family != family || 1823 x->km.state != XFRM_STATE_ACQ || 1824 x->id.spi != 0 || 1825 x->id.proto != proto || 1826 (mark & x->mark.m) != x->mark.v || 1827 x->pcpu_num != pcpu_num || 1828 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1829 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1830 continue; 1831 1832 xfrm_state_hold(x); 1833 return x; 1834 } 1835 1836 if (!create) 1837 return NULL; 1838 1839 x = xfrm_state_alloc(net); 1840 if (likely(x)) { 1841 switch (family) { 1842 case AF_INET: 1843 x->sel.daddr.a4 = daddr->a4; 1844 x->sel.saddr.a4 = saddr->a4; 1845 x->sel.prefixlen_d = 32; 1846 x->sel.prefixlen_s = 32; 1847 x->props.saddr.a4 = saddr->a4; 1848 x->id.daddr.a4 = daddr->a4; 1849 break; 1850 1851 case AF_INET6: 1852 x->sel.daddr.in6 = daddr->in6; 1853 x->sel.saddr.in6 = saddr->in6; 1854 x->sel.prefixlen_d = 128; 1855 x->sel.prefixlen_s = 128; 1856 x->props.saddr.in6 = saddr->in6; 1857 x->id.daddr.in6 = daddr->in6; 1858 break; 1859 } 1860 1861 x->pcpu_num = pcpu_num; 1862 x->km.state = XFRM_STATE_ACQ; 1863 x->id.proto = proto; 1864 x->props.family = family; 1865 x->props.mode = mode; 1866 x->props.reqid = reqid; 1867 x->if_id = if_id; 1868 x->mark.v = m->v; 1869 x->mark.m = m->m; 1870 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1871 xfrm_state_hold(x); 1872 hrtimer_start(&x->mtimer, 1873 ktime_set(net->xfrm.sysctl_acq_expires, 0), 1874 HRTIMER_MODE_REL_SOFT); 1875 list_add(&x->km.all, &net->xfrm.state_all); 1876 XFRM_STATE_INSERT(bydst, &x->bydst, 1877 xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, 1878 x->xso.type); 1879 h = xfrm_src_hash(net, daddr, saddr, family); 1880 XFRM_STATE_INSERT(bysrc, &x->bysrc, 1881 xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, 1882 x->xso.type); 1883 1884 net->xfrm.state_num++; 1885 1886 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1887 } 1888 1889 return x; 1890 } 1891 1892 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num); 1893 1894 int xfrm_state_add(struct xfrm_state *x) 1895 { 1896 struct net *net = xs_net(x); 1897 struct xfrm_state *x1, *to_put; 1898 int family; 1899 int err; 1900 u32 mark = x->mark.v & x->mark.m; 1901 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1902 1903 family = x->props.family; 1904 1905 to_put = NULL; 1906 1907 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1908 1909 x1 = __xfrm_state_locate(x, use_spi, family); 1910 if (x1) { 1911 to_put = x1; 1912 x1 = NULL; 1913 err = -EEXIST; 1914 goto out; 1915 } 1916 1917 if (use_spi && x->km.seq) { 1918 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq, x->pcpu_num); 1919 if (x1 && ((x1->id.proto != x->id.proto) || 1920 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1921 to_put = x1; 1922 x1 = NULL; 1923 } 1924 } 1925 1926 if (use_spi && !x1) 1927 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1928 x->props.reqid, x->if_id, x->pcpu_num, x->id.proto, 1929 &x->id.daddr, &x->props.saddr, 0); 1930 1931 __xfrm_state_bump_genids(x); 1932 __xfrm_state_insert(x); 1933 err = 0; 1934 1935 out: 1936 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1937 1938 if (x1) { 1939 xfrm_state_delete(x1); 1940 xfrm_state_put(x1); 1941 } 1942 1943 if (to_put) 1944 xfrm_state_put(to_put); 1945 1946 return err; 1947 } 1948 EXPORT_SYMBOL(xfrm_state_add); 1949 1950 #ifdef CONFIG_XFRM_MIGRATE 1951 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security) 1952 { 1953 struct xfrm_user_sec_ctx *uctx; 1954 int size = sizeof(*uctx) + security->ctx_len; 1955 int err; 1956 1957 uctx = kmalloc(size, GFP_KERNEL); 1958 if (!uctx) 1959 return -ENOMEM; 1960 1961 uctx->exttype = XFRMA_SEC_CTX; 1962 uctx->len = size; 1963 uctx->ctx_doi = security->ctx_doi; 1964 uctx->ctx_alg = security->ctx_alg; 1965 uctx->ctx_len = security->ctx_len; 1966 memcpy(uctx + 1, security->ctx_str, security->ctx_len); 1967 err = security_xfrm_state_alloc(x, uctx); 1968 kfree(uctx); 1969 if (err) 1970 return err; 1971 1972 return 0; 1973 } 1974 1975 static struct xfrm_state *xfrm_state_clone_and_setup(struct xfrm_state *orig, 1976 const struct xfrm_migrate *m) 1977 { 1978 struct net *net = xs_net(orig); 1979 struct xfrm_state *x = xfrm_state_alloc(net); 1980 if (!x) 1981 goto out; 1982 1983 memcpy(&x->id, &orig->id, sizeof(x->id)); 1984 if (m->msg_type == XFRM_MSG_MIGRATE_STATE) { 1985 if (m->flags & XFRM_MIGRATE_STATE_UPDATE_H2H_SEL) { 1986 u8 prefixlen = (m->new_family == AF_INET6) ? 128 : 32; 1987 1988 x->sel = orig->sel; 1989 x->sel.family = m->new_family; 1990 x->sel.prefixlen_d = prefixlen; 1991 x->sel.prefixlen_s = prefixlen; 1992 x->sel.daddr = m->new_daddr; 1993 x->sel.saddr = m->new_saddr; 1994 } else { 1995 x->sel = *m->new_sel; 1996 } 1997 } else { 1998 x->sel = orig->sel; 1999 } 2000 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 2001 x->props.mode = orig->props.mode; 2002 x->props.replay_window = orig->props.replay_window; 2003 2004 if (orig->aalg) { 2005 x->aalg = xfrm_algo_auth_clone(orig->aalg); 2006 if (!x->aalg) 2007 goto error; 2008 } 2009 x->props.aalgo = orig->props.aalgo; 2010 2011 if (orig->aead) { 2012 x->aead = xfrm_algo_aead_clone(orig->aead); 2013 x->geniv = orig->geniv; 2014 if (!x->aead) 2015 goto error; 2016 } 2017 if (orig->ealg) { 2018 x->ealg = xfrm_algo_clone(orig->ealg); 2019 if (!x->ealg) 2020 goto error; 2021 } 2022 x->props.ealgo = orig->props.ealgo; 2023 2024 if (orig->calg) { 2025 x->calg = xfrm_algo_clone(orig->calg); 2026 if (!x->calg) 2027 goto error; 2028 } 2029 x->props.calgo = orig->props.calgo; 2030 2031 if (m->encap) { 2032 x->encap = kmemdup(m->encap, sizeof(*x->encap), GFP_KERNEL); 2033 if (!x->encap) 2034 goto error; 2035 x->mapping_maxage = m->mapping_maxage; 2036 x->nat_keepalive_interval = m->nat_keepalive_interval; 2037 } 2038 2039 if (orig->security) 2040 if (clone_security(x, orig->security)) 2041 goto error; 2042 2043 if (orig->coaddr) { 2044 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 2045 GFP_KERNEL); 2046 if (!x->coaddr) 2047 goto error; 2048 } 2049 2050 if (xfrm_replay_clone(x, orig)) 2051 goto error; 2052 2053 x->mark = m->new_mark ? *m->new_mark : m->old_mark; 2054 2055 x->props.smark = m->smark; 2056 2057 x->props.flags = orig->props.flags; 2058 x->props.extra_flags = orig->props.extra_flags; 2059 2060 x->pcpu_num = orig->pcpu_num; 2061 x->if_id = orig->if_id; 2062 x->tfcpad = orig->tfcpad; 2063 x->replay_maxdiff = orig->replay_maxdiff; 2064 x->replay_maxage = orig->replay_maxage; 2065 x->km.state = orig->km.state; 2066 x->km.seq = orig->km.seq; 2067 x->lastused = orig->lastused; 2068 x->new_mapping = 0; 2069 x->new_mapping_sport = 0; 2070 x->dir = orig->dir; 2071 2072 x->mode_cbs = orig->mode_cbs; 2073 if (x->mode_cbs && x->mode_cbs->clone_state) { 2074 if (x->mode_cbs->clone_state(x, orig)) 2075 goto error; 2076 } 2077 2078 x->props.reqid = m->new_reqid; 2079 x->props.family = m->new_family; 2080 memcpy(&x->id.daddr, &m->new_daddr, sizeof(x->id.daddr)); 2081 memcpy(&x->props.saddr, &m->new_saddr, sizeof(x->props.saddr)); 2082 2083 return x; 2084 2085 error: 2086 x->km.state = XFRM_STATE_DEAD; 2087 xfrm_state_put(x); 2088 out: 2089 return NULL; 2090 } 2091 2092 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 2093 u32 if_id) 2094 { 2095 unsigned int h; 2096 struct xfrm_state *x = NULL; 2097 2098 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2099 2100 if (m->old_reqid) { 2101 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 2102 m->old_reqid, m->old_family); 2103 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + h, bydst) { 2104 if (x->props.mode != m->mode || 2105 x->id.proto != m->proto) 2106 continue; 2107 if (m->old_reqid && x->props.reqid != m->old_reqid) 2108 continue; 2109 if (if_id != 0 && x->if_id != if_id) 2110 continue; 2111 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2112 m->old_family) || 2113 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2114 m->old_family)) 2115 continue; 2116 xfrm_state_hold(x); 2117 break; 2118 } 2119 } else { 2120 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 2121 m->old_family); 2122 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bysrc, net) + h, bysrc) { 2123 if (x->props.mode != m->mode || 2124 x->id.proto != m->proto) 2125 continue; 2126 if (if_id != 0 && x->if_id != if_id) 2127 continue; 2128 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 2129 m->old_family) || 2130 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 2131 m->old_family)) 2132 continue; 2133 xfrm_state_hold(x); 2134 break; 2135 } 2136 } 2137 2138 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2139 2140 return x; 2141 } 2142 EXPORT_SYMBOL(xfrm_migrate_state_find); 2143 2144 struct xfrm_state *xfrm_state_migrate_create(struct xfrm_state *x, 2145 const struct xfrm_migrate *m, 2146 struct net *net, 2147 struct netlink_ext_ack *extack) 2148 { 2149 struct xfrm_state *xc; 2150 2151 xc = xfrm_state_clone_and_setup(x, m); 2152 if (!xc) { 2153 NL_SET_ERR_MSG(extack, "Failed to clone and setup state"); 2154 return NULL; 2155 } 2156 2157 if (xfrm_init_state(xc, extack) < 0) { 2158 NL_SET_ERR_MSG_WEAK(extack, "Failed to initialize migrated state"); 2159 goto error; 2160 } 2161 2162 /* configure the hardware if offload is requested */ 2163 if (m->xuo && xfrm_dev_state_add(net, xc, m->xuo, extack)) 2164 goto error; 2165 2166 return xc; 2167 error: 2168 xc->km.state = XFRM_STATE_DEAD; 2169 xfrm_state_put(xc); 2170 return NULL; 2171 } 2172 EXPORT_SYMBOL(xfrm_state_migrate_create); 2173 2174 int xfrm_state_migrate_install(const struct xfrm_state *x, 2175 struct xfrm_state *xc, 2176 const struct xfrm_migrate *m, 2177 struct netlink_ext_ack *extack) 2178 { 2179 if (m->new_family == m->old_family && 2180 xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 2181 /* 2182 * Care is needed when the destination address of the state is 2183 * to be updated as it is a part of triplet. 2184 */ 2185 xfrm_state_insert(xc); 2186 } else { 2187 if (xfrm_state_add(xc) < 0) { 2188 NL_SET_ERR_MSG(extack, "Failed to add migrated state"); 2189 if (m->xuo) 2190 xfrm_dev_state_delete(xc); 2191 xc->km.state = XFRM_STATE_DEAD; 2192 xfrm_state_put(xc); 2193 return -EEXIST; 2194 } 2195 } 2196 2197 return 0; 2198 } 2199 EXPORT_SYMBOL(xfrm_state_migrate_install); 2200 2201 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 2202 struct xfrm_migrate *m, 2203 struct net *net, 2204 struct netlink_ext_ack *extack) 2205 { 2206 struct xfrm_state *xc; 2207 2208 xc = xfrm_state_migrate_create(x, m, net, extack); 2209 if (!xc) 2210 return NULL; 2211 2212 xfrm_migrate_sync(xc, x); 2213 2214 if (xfrm_state_migrate_install(x, xc, m, extack) < 0) 2215 return NULL; 2216 2217 return xc; 2218 } 2219 EXPORT_SYMBOL(xfrm_state_migrate); 2220 #endif 2221 2222 int xfrm_state_update(struct xfrm_state *x) 2223 { 2224 struct xfrm_state *x1, *to_put; 2225 int err; 2226 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 2227 struct net *net = xs_net(x); 2228 2229 to_put = NULL; 2230 2231 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2232 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 2233 2234 err = -ESRCH; 2235 if (!x1) 2236 goto out; 2237 2238 if (xfrm_state_kern(x1)) { 2239 to_put = x1; 2240 err = -EEXIST; 2241 goto out; 2242 } 2243 2244 if (x1->km.state == XFRM_STATE_ACQ) { 2245 if (x->dir && x1->dir != x->dir) { 2246 to_put = x1; 2247 goto out; 2248 } 2249 2250 __xfrm_state_insert(x); 2251 x = NULL; 2252 } else { 2253 if (x1->dir != x->dir) { 2254 to_put = x1; 2255 goto out; 2256 } 2257 } 2258 err = 0; 2259 2260 out: 2261 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2262 2263 if (to_put) 2264 xfrm_state_put(to_put); 2265 2266 if (err) 2267 return err; 2268 2269 if (!x) { 2270 xfrm_state_delete(x1); 2271 xfrm_state_put(x1); 2272 return 0; 2273 } 2274 2275 err = -EINVAL; 2276 spin_lock_bh(&x1->lock); 2277 if (likely(x1->km.state == XFRM_STATE_VALID)) { 2278 if (x->encap && x1->encap && 2279 x->encap->encap_type == x1->encap->encap_type) 2280 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 2281 else if (x->encap || x1->encap) 2282 goto fail; 2283 2284 if (x->coaddr && x1->coaddr) { 2285 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 2286 } 2287 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 2288 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 2289 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 2290 x1->km.dying = 0; 2291 2292 hrtimer_start(&x1->mtimer, ktime_set(1, 0), 2293 HRTIMER_MODE_REL_SOFT); 2294 if (READ_ONCE(x1->curlft.use_time)) 2295 xfrm_state_check_expire(x1); 2296 2297 if (x->props.smark.m || x->props.smark.v || x->if_id) { 2298 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2299 2300 if (x->props.smark.m || x->props.smark.v) 2301 x1->props.smark = x->props.smark; 2302 2303 if (x->if_id) 2304 x1->if_id = x->if_id; 2305 2306 __xfrm_state_bump_genids(x1); 2307 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2308 } 2309 2310 err = 0; 2311 x->km.state = XFRM_STATE_DEAD; 2312 xfrm_dev_state_delete(x); 2313 __xfrm_state_put(x); 2314 } 2315 2316 fail: 2317 spin_unlock_bh(&x1->lock); 2318 2319 xfrm_state_put(x1); 2320 2321 return err; 2322 } 2323 EXPORT_SYMBOL(xfrm_state_update); 2324 2325 int xfrm_state_check_expire(struct xfrm_state *x) 2326 { 2327 /* All counters which are needed to decide if state is expired 2328 * are handled by SW for non-packet offload modes. Simply skip 2329 * the following update and save extra boilerplate in drivers. 2330 */ 2331 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 2332 xfrm_dev_state_update_stats(x); 2333 2334 if (!READ_ONCE(x->curlft.use_time)) 2335 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds()); 2336 2337 if (x->curlft.bytes >= x->lft.hard_byte_limit || 2338 x->curlft.packets >= x->lft.hard_packet_limit) { 2339 x->km.state = XFRM_STATE_EXPIRED; 2340 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); 2341 return -EINVAL; 2342 } 2343 2344 if (!x->km.dying && 2345 (x->curlft.bytes >= x->lft.soft_byte_limit || 2346 x->curlft.packets >= x->lft.soft_packet_limit)) { 2347 x->km.dying = 1; 2348 km_state_expired(x, 0, 0); 2349 } 2350 return 0; 2351 } 2352 EXPORT_SYMBOL(xfrm_state_check_expire); 2353 2354 void xfrm_state_update_stats(struct net *net) 2355 { 2356 struct xfrm_state *x; 2357 int i; 2358 2359 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2360 for (i = 0; i <= net->xfrm.state_hmask; i++) { 2361 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_bydst, net) + i, bydst) 2362 xfrm_dev_state_update_stats(x); 2363 } 2364 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2365 } 2366 2367 struct xfrm_state * 2368 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 2369 u8 proto, unsigned short family) 2370 { 2371 struct xfrm_hash_state_ptrs state_ptrs; 2372 struct xfrm_state *x; 2373 2374 rcu_read_lock(); 2375 xfrm_hash_ptrs_get(net, &state_ptrs); 2376 2377 x = __xfrm_state_lookup(&state_ptrs, mark, daddr, spi, proto, family); 2378 rcu_read_unlock(); 2379 return x; 2380 } 2381 EXPORT_SYMBOL(xfrm_state_lookup); 2382 2383 struct xfrm_state * 2384 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 2385 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 2386 u8 proto, unsigned short family) 2387 { 2388 struct xfrm_hash_state_ptrs state_ptrs; 2389 struct xfrm_state *x; 2390 2391 rcu_read_lock(); 2392 2393 xfrm_hash_ptrs_get(net, &state_ptrs); 2394 2395 x = __xfrm_state_lookup_byaddr(&state_ptrs, mark, daddr, saddr, proto, family); 2396 rcu_read_unlock(); 2397 return x; 2398 } 2399 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 2400 2401 struct xfrm_state * 2402 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 2403 u32 if_id, u32 pcpu_num, u8 proto, const xfrm_address_t *daddr, 2404 const xfrm_address_t *saddr, int create, unsigned short family) 2405 { 2406 struct xfrm_state *x; 2407 2408 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2409 x = __find_acq_core(net, mark, family, mode, reqid, if_id, pcpu_num, 2410 proto, daddr, saddr, create); 2411 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2412 2413 return x; 2414 } 2415 EXPORT_SYMBOL(xfrm_find_acq); 2416 2417 #ifdef CONFIG_XFRM_SUB_POLICY 2418 #if IS_ENABLED(CONFIG_IPV6) 2419 /* distribution counting sort function for xfrm_state and xfrm_tmpl */ 2420 static void 2421 __xfrm6_sort(void **dst, void **src, int n, 2422 int (*cmp)(const void *p), int maxclass) 2423 { 2424 int count[XFRM_MAX_DEPTH] = { }; 2425 int class[XFRM_MAX_DEPTH]; 2426 int i; 2427 2428 for (i = 0; i < n; i++) { 2429 int c = cmp(src[i]); 2430 2431 class[i] = c; 2432 count[c]++; 2433 } 2434 2435 for (i = 2; i < maxclass; i++) 2436 count[i] += count[i - 1]; 2437 2438 for (i = 0; i < n; i++) { 2439 dst[count[class[i] - 1]++] = src[i]; 2440 src[i] = NULL; 2441 } 2442 } 2443 2444 /* Rule for xfrm_state: 2445 * 2446 * rule 1: select IPsec transport except AH 2447 * rule 2: select MIPv6 RO or inbound trigger 2448 * rule 3: select IPsec transport AH 2449 * rule 4: select IPsec tunnel 2450 * rule 5: others 2451 */ 2452 static int __xfrm6_state_sort_cmp(const void *p) 2453 { 2454 const struct xfrm_state *v = p; 2455 2456 switch (v->props.mode) { 2457 case XFRM_MODE_TRANSPORT: 2458 if (v->id.proto != IPPROTO_AH) 2459 return 1; 2460 else 2461 return 3; 2462 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2463 case XFRM_MODE_ROUTEOPTIMIZATION: 2464 case XFRM_MODE_IN_TRIGGER: 2465 return 2; 2466 #endif 2467 case XFRM_MODE_TUNNEL: 2468 case XFRM_MODE_BEET: 2469 case XFRM_MODE_IPTFS: 2470 return 4; 2471 } 2472 return 5; 2473 } 2474 2475 /* Rule for xfrm_tmpl: 2476 * 2477 * rule 1: select IPsec transport 2478 * rule 2: select MIPv6 RO or inbound trigger 2479 * rule 3: select IPsec tunnel 2480 * rule 4: others 2481 */ 2482 static int __xfrm6_tmpl_sort_cmp(const void *p) 2483 { 2484 const struct xfrm_tmpl *v = p; 2485 2486 switch (v->mode) { 2487 case XFRM_MODE_TRANSPORT: 2488 return 1; 2489 #if IS_ENABLED(CONFIG_IPV6_MIP6) 2490 case XFRM_MODE_ROUTEOPTIMIZATION: 2491 case XFRM_MODE_IN_TRIGGER: 2492 return 2; 2493 #endif 2494 case XFRM_MODE_TUNNEL: 2495 case XFRM_MODE_BEET: 2496 case XFRM_MODE_IPTFS: 2497 return 3; 2498 } 2499 return 4; 2500 } 2501 #else 2502 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } 2503 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } 2504 2505 static inline void 2506 __xfrm6_sort(void **dst, void **src, int n, 2507 int (*cmp)(const void *p), int maxclass) 2508 { 2509 int i; 2510 2511 for (i = 0; i < n; i++) 2512 dst[i] = src[i]; 2513 } 2514 #endif /* CONFIG_IPV6 */ 2515 2516 void 2517 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 2518 unsigned short family) 2519 { 2520 int i; 2521 2522 if (family == AF_INET6) 2523 __xfrm6_sort((void **)dst, (void **)src, n, 2524 __xfrm6_tmpl_sort_cmp, 5); 2525 else 2526 for (i = 0; i < n; i++) 2527 dst[i] = src[i]; 2528 } 2529 2530 void 2531 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 2532 unsigned short family) 2533 { 2534 int i; 2535 2536 if (family == AF_INET6) 2537 __xfrm6_sort((void **)dst, (void **)src, n, 2538 __xfrm6_state_sort_cmp, 6); 2539 else 2540 for (i = 0; i < n; i++) 2541 dst[i] = src[i]; 2542 } 2543 #endif 2544 2545 /* Silly enough, but I'm lazy to build resolution list */ 2546 2547 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2548 { 2549 unsigned int h = xfrm_seq_hash(net, seq); 2550 struct xfrm_state *x; 2551 2552 hlist_for_each_entry(x, xfrm_state_deref_prot(net->xfrm.state_byseq, net) + h, byseq) { 2553 if (x->km.seq == seq && 2554 (mark & x->mark.m) == x->mark.v && 2555 x->pcpu_num == pcpu_num && 2556 x->km.state == XFRM_STATE_ACQ) { 2557 xfrm_state_hold(x); 2558 return x; 2559 } 2560 } 2561 2562 return NULL; 2563 } 2564 2565 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num) 2566 { 2567 struct xfrm_state *x; 2568 2569 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2570 x = __xfrm_find_acq_byseq(net, mark, seq, pcpu_num); 2571 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2572 return x; 2573 } 2574 EXPORT_SYMBOL(xfrm_find_acq_byseq); 2575 2576 u32 xfrm_get_acqseq(void) 2577 { 2578 u32 res; 2579 static atomic_t acqseq; 2580 2581 do { 2582 res = atomic_inc_return(&acqseq); 2583 } while (!res); 2584 2585 return res; 2586 } 2587 EXPORT_SYMBOL(xfrm_get_acqseq); 2588 2589 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack) 2590 { 2591 switch (proto) { 2592 case IPPROTO_AH: 2593 case IPPROTO_ESP: 2594 break; 2595 2596 case IPPROTO_COMP: 2597 /* IPCOMP spi is 16-bits. */ 2598 if (max >= 0x10000) { 2599 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535"); 2600 return -EINVAL; 2601 } 2602 break; 2603 2604 default: 2605 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP"); 2606 return -EINVAL; 2607 } 2608 2609 if (min > max) { 2610 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max"); 2611 return -EINVAL; 2612 } 2613 2614 return 0; 2615 } 2616 EXPORT_SYMBOL(verify_spi_info); 2617 2618 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high, 2619 struct netlink_ext_ack *extack) 2620 { 2621 struct net *net = xs_net(x); 2622 unsigned int h; 2623 struct xfrm_state *x0; 2624 int err = -ENOENT; 2625 u32 range = high - low + 1; 2626 __be32 newspi = 0; 2627 2628 spin_lock_bh(&x->lock); 2629 if (x->km.state == XFRM_STATE_DEAD) { 2630 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state"); 2631 goto unlock; 2632 } 2633 2634 err = 0; 2635 if (x->id.spi) 2636 goto unlock; 2637 2638 err = -ENOENT; 2639 2640 for (h = 0; h < range; h++) { 2641 u32 spi = (low == high) ? low : get_random_u32_inclusive(low, high); 2642 if (spi == 0) 2643 goto next; 2644 newspi = htonl(spi); 2645 2646 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2647 x0 = xfrm_state_lookup_spi_proto(net, newspi, x->id.proto); 2648 if (!x0) { 2649 x->id.spi = newspi; 2650 h = xfrm_spi_hash(net, &x->id.daddr, newspi, x->id.proto, x->props.family); 2651 XFRM_STATE_INSERT(byspi, &x->byspi, 2652 xfrm_state_deref_prot(net->xfrm.state_byspi, net) + h, 2653 x->xso.type); 2654 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2655 err = 0; 2656 goto unlock; 2657 } 2658 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2659 2660 next: 2661 if (signal_pending(current)) { 2662 err = -ERESTARTSYS; 2663 goto unlock; 2664 } 2665 2666 if (low == high) 2667 break; 2668 } 2669 2670 if (err) 2671 NL_SET_ERR_MSG(extack, "No SPI available in the requested range"); 2672 2673 unlock: 2674 spin_unlock_bh(&x->lock); 2675 2676 return err; 2677 } 2678 EXPORT_SYMBOL(xfrm_alloc_spi); 2679 2680 static bool __xfrm_state_filter_match(struct xfrm_state *x, 2681 struct xfrm_address_filter *filter) 2682 { 2683 if (filter) { 2684 if ((filter->family == AF_INET || 2685 filter->family == AF_INET6) && 2686 x->props.family != filter->family) 2687 return false; 2688 2689 return addr_match(&x->props.saddr, &filter->saddr, 2690 filter->splen) && 2691 addr_match(&x->id.daddr, &filter->daddr, 2692 filter->dplen); 2693 } 2694 return true; 2695 } 2696 2697 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 2698 int (*func)(struct xfrm_state *, int, void*), 2699 void *data) 2700 { 2701 struct xfrm_state *state; 2702 struct xfrm_state_walk *x; 2703 int err = 0; 2704 2705 if (walk->seq != 0 && list_empty(&walk->all)) 2706 return 0; 2707 2708 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2709 if (list_empty(&walk->all)) 2710 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 2711 else 2712 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 2713 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 2714 if (x->state == XFRM_STATE_DEAD) 2715 continue; 2716 state = container_of(x, struct xfrm_state, km); 2717 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 2718 continue; 2719 if (!__xfrm_state_filter_match(state, walk->filter)) 2720 continue; 2721 err = func(state, walk->seq, data); 2722 if (err) { 2723 list_move_tail(&walk->all, &x->all); 2724 goto out; 2725 } 2726 walk->seq++; 2727 } 2728 if (walk->seq == 0) { 2729 err = -ENOENT; 2730 goto out; 2731 } 2732 list_del_init(&walk->all); 2733 out: 2734 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2735 return err; 2736 } 2737 EXPORT_SYMBOL(xfrm_state_walk); 2738 2739 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 2740 struct xfrm_address_filter *filter) 2741 { 2742 INIT_LIST_HEAD(&walk->all); 2743 walk->proto = proto; 2744 walk->state = XFRM_STATE_DEAD; 2745 walk->seq = 0; 2746 walk->filter = filter; 2747 } 2748 EXPORT_SYMBOL(xfrm_state_walk_init); 2749 2750 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 2751 { 2752 kfree(walk->filter); 2753 2754 if (list_empty(&walk->all)) 2755 return; 2756 2757 spin_lock_bh(&net->xfrm.xfrm_state_lock); 2758 list_del(&walk->all); 2759 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 2760 } 2761 EXPORT_SYMBOL(xfrm_state_walk_done); 2762 2763 static void xfrm_replay_timer_handler(struct timer_list *t) 2764 { 2765 struct xfrm_state *x = timer_container_of(x, t, rtimer); 2766 2767 spin_lock(&x->lock); 2768 2769 if (x->km.state == XFRM_STATE_VALID) { 2770 if (xfrm_aevent_is_on(xs_net(x))) 2771 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); 2772 else 2773 x->xflags |= XFRM_TIME_DEFER; 2774 } 2775 2776 spin_unlock(&x->lock); 2777 } 2778 2779 static LIST_HEAD(xfrm_km_list); 2780 2781 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2782 { 2783 struct xfrm_mgr *km; 2784 2785 rcu_read_lock(); 2786 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2787 if (km->notify_policy) 2788 km->notify_policy(xp, dir, c); 2789 rcu_read_unlock(); 2790 } 2791 2792 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 2793 { 2794 struct xfrm_mgr *km; 2795 rcu_read_lock(); 2796 list_for_each_entry_rcu(km, &xfrm_km_list, list) 2797 if (km->notify) 2798 km->notify(x, c); 2799 rcu_read_unlock(); 2800 } 2801 2802 EXPORT_SYMBOL(km_policy_notify); 2803 EXPORT_SYMBOL(km_state_notify); 2804 2805 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 2806 { 2807 struct km_event c; 2808 2809 c.data.hard = hard; 2810 c.portid = portid; 2811 c.event = XFRM_MSG_EXPIRE; 2812 km_state_notify(x, &c); 2813 } 2814 2815 EXPORT_SYMBOL(km_state_expired); 2816 /* 2817 * We send to all registered managers regardless of failure 2818 * We are happy with one success 2819 */ 2820 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 2821 { 2822 int err = -EINVAL, acqret; 2823 struct xfrm_mgr *km; 2824 2825 rcu_read_lock(); 2826 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2827 acqret = km->acquire(x, t, pol); 2828 if (!acqret) 2829 err = acqret; 2830 } 2831 rcu_read_unlock(); 2832 return err; 2833 } 2834 EXPORT_SYMBOL(km_query); 2835 2836 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2837 { 2838 int err = -EINVAL; 2839 struct xfrm_mgr *km; 2840 2841 rcu_read_lock(); 2842 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2843 if (km->new_mapping) 2844 err = km->new_mapping(x, ipaddr, sport); 2845 if (!err) 2846 break; 2847 } 2848 rcu_read_unlock(); 2849 return err; 2850 } 2851 2852 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2853 { 2854 int ret = 0; 2855 2856 if (x->mapping_maxage) { 2857 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage || 2858 x->new_mapping_sport != sport) { 2859 x->new_mapping_sport = sport; 2860 x->new_mapping = jiffies / HZ; 2861 ret = __km_new_mapping(x, ipaddr, sport); 2862 } 2863 } else { 2864 ret = __km_new_mapping(x, ipaddr, sport); 2865 } 2866 2867 return ret; 2868 } 2869 EXPORT_SYMBOL(km_new_mapping); 2870 2871 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 2872 { 2873 struct km_event c; 2874 2875 c.data.hard = hard; 2876 c.portid = portid; 2877 c.event = XFRM_MSG_POLEXPIRE; 2878 km_policy_notify(pol, dir, &c); 2879 } 2880 EXPORT_SYMBOL(km_policy_expired); 2881 2882 #ifdef CONFIG_XFRM_MIGRATE 2883 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2884 const struct xfrm_migrate *m, int num_migrate, 2885 const struct xfrm_kmaddress *k, struct net *net, 2886 const struct xfrm_encap_tmpl *encap) 2887 { 2888 int err = -EINVAL; 2889 int ret; 2890 struct xfrm_mgr *km; 2891 2892 rcu_read_lock(); 2893 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2894 if (km->migrate) { 2895 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2896 net, encap); 2897 if (!ret) 2898 err = ret; 2899 } 2900 } 2901 rcu_read_unlock(); 2902 return err; 2903 } 2904 EXPORT_SYMBOL(km_migrate); 2905 #endif 2906 2907 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2908 { 2909 int err = -EINVAL; 2910 int ret; 2911 struct xfrm_mgr *km; 2912 2913 rcu_read_lock(); 2914 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2915 if (km->report) { 2916 ret = km->report(net, proto, sel, addr); 2917 if (!ret) 2918 err = ret; 2919 } 2920 } 2921 rcu_read_unlock(); 2922 return err; 2923 } 2924 EXPORT_SYMBOL(km_report); 2925 2926 static bool km_is_alive(const struct km_event *c) 2927 { 2928 struct xfrm_mgr *km; 2929 bool is_alive = false; 2930 2931 rcu_read_lock(); 2932 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2933 if (km->is_alive && km->is_alive(c)) { 2934 is_alive = true; 2935 break; 2936 } 2937 } 2938 rcu_read_unlock(); 2939 2940 return is_alive; 2941 } 2942 2943 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2944 static DEFINE_SPINLOCK(xfrm_translator_lock); 2945 static struct xfrm_translator __rcu *xfrm_translator; 2946 2947 struct xfrm_translator *xfrm_get_translator(void) 2948 { 2949 struct xfrm_translator *xtr; 2950 2951 rcu_read_lock(); 2952 xtr = rcu_dereference(xfrm_translator); 2953 if (unlikely(!xtr)) 2954 goto out; 2955 if (!try_module_get(xtr->owner)) 2956 xtr = NULL; 2957 out: 2958 rcu_read_unlock(); 2959 return xtr; 2960 } 2961 EXPORT_SYMBOL_GPL(xfrm_get_translator); 2962 2963 void xfrm_put_translator(struct xfrm_translator *xtr) 2964 { 2965 module_put(xtr->owner); 2966 } 2967 EXPORT_SYMBOL_GPL(xfrm_put_translator); 2968 2969 int xfrm_register_translator(struct xfrm_translator *xtr) 2970 { 2971 int err = 0; 2972 2973 spin_lock_bh(&xfrm_translator_lock); 2974 if (unlikely(xfrm_translator != NULL)) 2975 err = -EEXIST; 2976 else 2977 rcu_assign_pointer(xfrm_translator, xtr); 2978 spin_unlock_bh(&xfrm_translator_lock); 2979 2980 return err; 2981 } 2982 EXPORT_SYMBOL_GPL(xfrm_register_translator); 2983 2984 int xfrm_unregister_translator(struct xfrm_translator *xtr) 2985 { 2986 int err = 0; 2987 2988 spin_lock_bh(&xfrm_translator_lock); 2989 if (likely(xfrm_translator != NULL)) { 2990 if (rcu_access_pointer(xfrm_translator) != xtr) 2991 err = -EINVAL; 2992 else 2993 RCU_INIT_POINTER(xfrm_translator, NULL); 2994 } 2995 spin_unlock_bh(&xfrm_translator_lock); 2996 synchronize_rcu(); 2997 2998 return err; 2999 } 3000 EXPORT_SYMBOL_GPL(xfrm_unregister_translator); 3001 #endif 3002 3003 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen) 3004 { 3005 int err; 3006 u8 *data; 3007 struct xfrm_mgr *km; 3008 struct xfrm_policy *pol = NULL; 3009 3010 if (sockptr_is_null(optval) && !optlen) { 3011 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 3012 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 3013 __sk_dst_reset(sk); 3014 return 0; 3015 } 3016 3017 if (optlen <= 0 || optlen > PAGE_SIZE) 3018 return -EMSGSIZE; 3019 3020 data = memdup_sockptr(optval, optlen); 3021 if (IS_ERR(data)) 3022 return PTR_ERR(data); 3023 3024 if (IS_ENABLED(CONFIG_COMPAT_FOR_U64_ALIGNMENT) && in_compat_syscall()) { 3025 struct xfrm_translator *xtr = xfrm_get_translator(); 3026 3027 if (!xtr) { 3028 kfree(data); 3029 return -EOPNOTSUPP; 3030 } 3031 3032 err = xtr->xlate_user_policy_sockptr(&data, optlen); 3033 xfrm_put_translator(xtr); 3034 if (err) { 3035 kfree(data); 3036 return err; 3037 } 3038 } 3039 3040 err = -EINVAL; 3041 rcu_read_lock(); 3042 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 3043 pol = km->compile_policy(sk, optname, data, 3044 optlen, &err); 3045 if (err >= 0) 3046 break; 3047 } 3048 rcu_read_unlock(); 3049 3050 if (err >= 0) { 3051 xfrm_sk_policy_insert(sk, err, pol); 3052 xfrm_pol_put(pol); 3053 __sk_dst_reset(sk); 3054 err = 0; 3055 } 3056 3057 kfree(data); 3058 return err; 3059 } 3060 EXPORT_SYMBOL(xfrm_user_policy); 3061 3062 static DEFINE_SPINLOCK(xfrm_km_lock); 3063 3064 void xfrm_register_km(struct xfrm_mgr *km) 3065 { 3066 spin_lock_bh(&xfrm_km_lock); 3067 list_add_tail_rcu(&km->list, &xfrm_km_list); 3068 spin_unlock_bh(&xfrm_km_lock); 3069 } 3070 EXPORT_SYMBOL(xfrm_register_km); 3071 3072 void xfrm_unregister_km(struct xfrm_mgr *km) 3073 { 3074 spin_lock_bh(&xfrm_km_lock); 3075 list_del_rcu(&km->list); 3076 spin_unlock_bh(&xfrm_km_lock); 3077 synchronize_rcu(); 3078 } 3079 EXPORT_SYMBOL(xfrm_unregister_km); 3080 3081 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 3082 { 3083 int err = 0; 3084 3085 if (WARN_ON(afinfo->family >= NPROTO)) 3086 return -EAFNOSUPPORT; 3087 3088 spin_lock_bh(&xfrm_state_afinfo_lock); 3089 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 3090 err = -EEXIST; 3091 else 3092 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 3093 spin_unlock_bh(&xfrm_state_afinfo_lock); 3094 return err; 3095 } 3096 EXPORT_SYMBOL(xfrm_state_register_afinfo); 3097 3098 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 3099 { 3100 int err = 0, family = afinfo->family; 3101 3102 if (WARN_ON(family >= NPROTO)) 3103 return -EAFNOSUPPORT; 3104 3105 spin_lock_bh(&xfrm_state_afinfo_lock); 3106 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 3107 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 3108 err = -EINVAL; 3109 else 3110 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 3111 } 3112 spin_unlock_bh(&xfrm_state_afinfo_lock); 3113 synchronize_rcu(); 3114 return err; 3115 } 3116 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 3117 3118 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 3119 { 3120 if (unlikely(family >= NPROTO)) 3121 return NULL; 3122 3123 return rcu_dereference(xfrm_state_afinfo[family]); 3124 } 3125 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); 3126 3127 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 3128 { 3129 struct xfrm_state_afinfo *afinfo; 3130 if (unlikely(family >= NPROTO)) 3131 return NULL; 3132 rcu_read_lock(); 3133 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 3134 if (unlikely(!afinfo)) 3135 rcu_read_unlock(); 3136 return afinfo; 3137 } 3138 3139 void xfrm_flush_gc(void) 3140 { 3141 flush_work(&xfrm_state_gc_work); 3142 } 3143 EXPORT_SYMBOL(xfrm_flush_gc); 3144 3145 static void xfrm_state_delete_tunnel(struct xfrm_state *x) 3146 { 3147 if (x->tunnel) { 3148 struct xfrm_state *t = x->tunnel; 3149 3150 if (atomic_dec_return(&t->tunnel_users) == 1) 3151 xfrm_state_delete(t); 3152 xfrm_state_put(t); 3153 x->tunnel = NULL; 3154 } 3155 } 3156 3157 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) 3158 { 3159 const struct xfrm_type *type = READ_ONCE(x->type); 3160 struct crypto_aead *aead; 3161 u32 blksize, net_adj = 0; 3162 u32 overhead, payload_mtu; 3163 3164 if (x->km.state != XFRM_STATE_VALID || 3165 !type || type->proto != IPPROTO_ESP) { 3166 if (mtu <= x->props.header_len) 3167 return 1; 3168 return mtu - x->props.header_len; 3169 } 3170 3171 aead = x->data; 3172 blksize = ALIGN(crypto_aead_blocksize(aead), 4); 3173 3174 switch (x->props.mode) { 3175 case XFRM_MODE_TRANSPORT: 3176 case XFRM_MODE_BEET: 3177 if (x->props.family == AF_INET) 3178 net_adj = sizeof(struct iphdr); 3179 else if (x->props.family == AF_INET6) 3180 net_adj = sizeof(struct ipv6hdr); 3181 break; 3182 case XFRM_MODE_TUNNEL: 3183 break; 3184 default: 3185 if (x->mode_cbs && x->mode_cbs->get_inner_mtu) 3186 return x->mode_cbs->get_inner_mtu(x, mtu); 3187 3188 WARN_ON_ONCE(1); 3189 break; 3190 } 3191 3192 overhead = x->props.header_len + crypto_aead_authsize(aead) + net_adj; 3193 if (mtu <= overhead) 3194 return 1; 3195 3196 payload_mtu = mtu - overhead; 3197 payload_mtu &= ~(blksize - 1); 3198 if (payload_mtu <= 2) 3199 return 1; 3200 3201 return payload_mtu + net_adj - 2; 3202 3203 } 3204 EXPORT_SYMBOL_GPL(xfrm_state_mtu); 3205 3206 int __xfrm_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) 3207 { 3208 const struct xfrm_mode *inner_mode; 3209 const struct xfrm_mode *outer_mode; 3210 int family = x->props.family; 3211 int err; 3212 3213 if (family == AF_INET && 3214 (!x->dir || x->dir == XFRM_SA_DIR_OUT) && 3215 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)) 3216 x->props.flags |= XFRM_STATE_NOPMTUDISC; 3217 3218 err = -EPROTONOSUPPORT; 3219 3220 if (x->sel.family != AF_UNSPEC) { 3221 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 3222 if (inner_mode == NULL) { 3223 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3224 goto error; 3225 } 3226 3227 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 3228 family != x->sel.family) { 3229 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family"); 3230 goto error; 3231 } 3232 3233 x->inner_mode = *inner_mode; 3234 } else { 3235 const struct xfrm_mode *inner_mode_iaf; 3236 int iafamily = AF_INET; 3237 3238 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 3239 if (inner_mode == NULL) { 3240 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3241 goto error; 3242 } 3243 3244 x->inner_mode = *inner_mode; 3245 3246 if (x->props.family == AF_INET) 3247 iafamily = AF_INET6; 3248 3249 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 3250 if (inner_mode_iaf) { 3251 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 3252 x->inner_mode_iaf = *inner_mode_iaf; 3253 } 3254 } 3255 3256 x->type = xfrm_get_type(x->id.proto, family); 3257 if (x->type == NULL) { 3258 NL_SET_ERR_MSG(extack, "Requested type not found"); 3259 goto error; 3260 } 3261 3262 err = x->type->init_state(x, extack); 3263 if (err) 3264 goto error; 3265 3266 outer_mode = xfrm_get_mode(x->props.mode, family); 3267 if (!outer_mode) { 3268 NL_SET_ERR_MSG(extack, "Requested mode not found"); 3269 err = -EPROTONOSUPPORT; 3270 goto error; 3271 } 3272 3273 x->outer_mode = *outer_mode; 3274 if (x->nat_keepalive_interval) { 3275 if (x->dir != XFRM_SA_DIR_OUT) { 3276 NL_SET_ERR_MSG(extack, "NAT keepalive is only supported for outbound SAs"); 3277 err = -EINVAL; 3278 goto error; 3279 } 3280 3281 if (!x->encap || x->encap->encap_type != UDP_ENCAP_ESPINUDP) { 3282 NL_SET_ERR_MSG(extack, 3283 "NAT keepalive is only supported for UDP encapsulation"); 3284 err = -EINVAL; 3285 goto error; 3286 } 3287 } 3288 3289 x->mode_cbs = xfrm_get_mode_cbs(x->props.mode); 3290 if (x->mode_cbs) { 3291 if (x->mode_cbs->init_state) 3292 err = x->mode_cbs->init_state(x); 3293 module_put(x->mode_cbs->owner); 3294 } 3295 error: 3296 return err; 3297 } 3298 3299 EXPORT_SYMBOL(__xfrm_init_state); 3300 3301 int xfrm_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) 3302 { 3303 int err; 3304 3305 err = __xfrm_init_state(x, extack); 3306 if (err) 3307 return err; 3308 3309 err = xfrm_init_replay(x, NULL); 3310 if (err) 3311 return err; 3312 3313 x->km.state = XFRM_STATE_VALID; 3314 return 0; 3315 } 3316 3317 EXPORT_SYMBOL(xfrm_init_state); 3318 3319 int __net_init xfrm_state_init(struct net *net) 3320 { 3321 struct hlist_head *ndst, *nsrc, *nspi, *nseq; 3322 unsigned int sz; 3323 3324 if (net_eq(net, &init_net)) 3325 xfrm_state_cache = KMEM_CACHE(xfrm_state, 3326 SLAB_HWCACHE_ALIGN | SLAB_PANIC); 3327 3328 INIT_LIST_HEAD(&net->xfrm.state_all); 3329 3330 sz = sizeof(struct hlist_head) * 8; 3331 3332 ndst = xfrm_hash_alloc(sz); 3333 if (!ndst) 3334 goto out_bydst; 3335 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 3336 3337 nsrc = xfrm_hash_alloc(sz); 3338 if (!nsrc) 3339 goto out_bysrc; 3340 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 3341 3342 nspi = xfrm_hash_alloc(sz); 3343 if (!nspi) 3344 goto out_byspi; 3345 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 3346 3347 nseq = xfrm_hash_alloc(sz); 3348 if (!nseq) 3349 goto out_byseq; 3350 rcu_assign_pointer(net->xfrm.state_byseq, nseq); 3351 3352 net->xfrm.state_cache_input = alloc_percpu(struct hlist_head); 3353 if (!net->xfrm.state_cache_input) 3354 goto out_state_cache_input; 3355 3356 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 3357 3358 net->xfrm.state_num = 0; 3359 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 3360 spin_lock_init(&net->xfrm.xfrm_state_lock); 3361 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation, 3362 &net->xfrm.xfrm_state_lock); 3363 return 0; 3364 3365 out_state_cache_input: 3366 xfrm_hash_free(nseq, sz); 3367 out_byseq: 3368 xfrm_hash_free(nspi, sz); 3369 out_byspi: 3370 xfrm_hash_free(nsrc, sz); 3371 out_bysrc: 3372 xfrm_hash_free(ndst, sz); 3373 out_bydst: 3374 return -ENOMEM; 3375 } 3376 3377 #define xfrm_state_deref_netexit(table) \ 3378 rcu_dereference_protected((table), true /* netns is going away */) 3379 void xfrm_state_fini(struct net *net) 3380 { 3381 unsigned int sz; 3382 int i; 3383 3384 flush_work(&net->xfrm.state_hash_work); 3385 xfrm_state_flush(net, 0, false); 3386 flush_work(&xfrm_state_gc_work); 3387 3388 WARN_ON(!list_empty(&net->xfrm.state_all)); 3389 3390 for (i = 0; i <= net->xfrm.state_hmask; i++) { 3391 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_byseq) + i)); 3392 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_byspi) + i)); 3393 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_bysrc) + i)); 3394 WARN_ON(!hlist_empty(xfrm_state_deref_netexit(net->xfrm.state_bydst) + i)); 3395 } 3396 3397 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 3398 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_byseq), sz); 3399 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_byspi), sz); 3400 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_bysrc), sz); 3401 xfrm_hash_free(xfrm_state_deref_netexit(net->xfrm.state_bydst), sz); 3402 free_percpu(net->xfrm.state_cache_input); 3403 } 3404 3405 #ifdef CONFIG_AUDITSYSCALL 3406 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 3407 struct audit_buffer *audit_buf) 3408 { 3409 struct xfrm_sec_ctx *ctx = x->security; 3410 u32 spi = ntohl(x->id.spi); 3411 3412 if (ctx) 3413 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 3414 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 3415 3416 switch (x->props.family) { 3417 case AF_INET: 3418 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3419 &x->props.saddr.a4, &x->id.daddr.a4); 3420 break; 3421 case AF_INET6: 3422 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 3423 x->props.saddr.a6, x->id.daddr.a6); 3424 break; 3425 } 3426 3427 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3428 } 3429 3430 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 3431 struct audit_buffer *audit_buf) 3432 { 3433 const struct iphdr *iph4; 3434 const struct ipv6hdr *iph6; 3435 3436 switch (family) { 3437 case AF_INET: 3438 iph4 = ip_hdr(skb); 3439 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 3440 &iph4->saddr, &iph4->daddr); 3441 break; 3442 case AF_INET6: 3443 iph6 = ipv6_hdr(skb); 3444 audit_log_format(audit_buf, 3445 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 3446 &iph6->saddr, &iph6->daddr, 3447 iph6->flow_lbl[0] & 0x0f, 3448 iph6->flow_lbl[1], 3449 iph6->flow_lbl[2]); 3450 break; 3451 } 3452 } 3453 3454 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 3455 { 3456 struct audit_buffer *audit_buf; 3457 3458 audit_buf = xfrm_audit_start("SAD-add"); 3459 if (audit_buf == NULL) 3460 return; 3461 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3462 xfrm_audit_helper_sainfo(x, audit_buf); 3463 audit_log_format(audit_buf, " res=%u", result); 3464 audit_log_end(audit_buf); 3465 } 3466 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 3467 3468 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 3469 { 3470 struct audit_buffer *audit_buf; 3471 3472 audit_buf = xfrm_audit_start("SAD-delete"); 3473 if (audit_buf == NULL) 3474 return; 3475 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 3476 xfrm_audit_helper_sainfo(x, audit_buf); 3477 audit_log_format(audit_buf, " res=%u", result); 3478 audit_log_end(audit_buf); 3479 } 3480 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 3481 3482 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 3483 struct sk_buff *skb) 3484 { 3485 struct audit_buffer *audit_buf; 3486 u32 spi; 3487 3488 audit_buf = xfrm_audit_start("SA-replay-overflow"); 3489 if (audit_buf == NULL) 3490 return; 3491 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3492 /* don't record the sequence number because it's inherent in this kind 3493 * of audit message */ 3494 spi = ntohl(x->id.spi); 3495 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 3496 audit_log_end(audit_buf); 3497 } 3498 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 3499 3500 void xfrm_audit_state_replay(struct xfrm_state *x, 3501 struct sk_buff *skb, __be32 net_seq) 3502 { 3503 struct audit_buffer *audit_buf; 3504 u32 spi; 3505 3506 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 3507 if (audit_buf == NULL) 3508 return; 3509 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3510 spi = ntohl(x->id.spi); 3511 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3512 spi, spi, ntohl(net_seq)); 3513 audit_log_end(audit_buf); 3514 } 3515 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 3516 3517 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 3518 { 3519 struct audit_buffer *audit_buf; 3520 3521 audit_buf = xfrm_audit_start("SA-notfound"); 3522 if (audit_buf == NULL) 3523 return; 3524 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3525 audit_log_end(audit_buf); 3526 } 3527 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 3528 3529 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 3530 __be32 net_spi, __be32 net_seq) 3531 { 3532 struct audit_buffer *audit_buf; 3533 u32 spi; 3534 3535 audit_buf = xfrm_audit_start("SA-notfound"); 3536 if (audit_buf == NULL) 3537 return; 3538 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 3539 spi = ntohl(net_spi); 3540 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3541 spi, spi, ntohl(net_seq)); 3542 audit_log_end(audit_buf); 3543 } 3544 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 3545 3546 void xfrm_audit_state_icvfail(struct xfrm_state *x, 3547 struct sk_buff *skb, u8 proto) 3548 { 3549 struct audit_buffer *audit_buf; 3550 __be32 net_spi; 3551 __be32 net_seq; 3552 3553 audit_buf = xfrm_audit_start("SA-icv-failure"); 3554 if (audit_buf == NULL) 3555 return; 3556 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 3557 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 3558 u32 spi = ntohl(net_spi); 3559 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 3560 spi, spi, ntohl(net_seq)); 3561 } 3562 audit_log_end(audit_buf); 3563 } 3564 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 3565 #endif /* CONFIG_AUDITSYSCALL */ 3566