1 /* 2 * xfrm_state.c 3 * 4 * Changes: 5 * Mitsuru KANDA @USAGI 6 * Kazunori MIYAZAWA @USAGI 7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 8 * IPv6 support 9 * YOSHIFUJI Hideaki @USAGI 10 * Split up af-specific functions 11 * Derek Atkins <derek@ihtfp.com> 12 * Add UDP Encapsulation 13 * 14 */ 15 16 #include <linux/workqueue.h> 17 #include <net/xfrm.h> 18 #include <linux/pfkeyv2.h> 19 #include <linux/ipsec.h> 20 #include <linux/module.h> 21 #include <linux/cache.h> 22 #include <linux/audit.h> 23 #include <linux/uaccess.h> 24 #include <linux/ktime.h> 25 #include <linux/slab.h> 26 #include <linux/interrupt.h> 27 #include <linux/kernel.h> 28 29 #include "xfrm_hash.h" 30 31 #define xfrm_state_deref_prot(table, net) \ 32 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) 33 34 static void xfrm_state_gc_task(struct work_struct *work); 35 36 /* Each xfrm_state may be linked to two tables: 37 38 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) 39 2. Hash table by (daddr,family,reqid) to find what SAs exist for given 40 destination/tunnel endpoint. (output) 41 */ 42 43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation); 45 46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); 47 static HLIST_HEAD(xfrm_state_gc_list); 48 49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) 50 { 51 return refcount_inc_not_zero(&x->refcnt); 52 } 53 54 static inline unsigned int xfrm_dst_hash(struct net *net, 55 const xfrm_address_t *daddr, 56 const xfrm_address_t *saddr, 57 u32 reqid, 58 unsigned short family) 59 { 60 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 61 } 62 63 static inline unsigned int xfrm_src_hash(struct net *net, 64 const xfrm_address_t *daddr, 65 const xfrm_address_t *saddr, 66 unsigned short family) 67 { 68 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 69 } 70 71 static inline unsigned int 72 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 73 __be32 spi, u8 proto, unsigned short family) 74 { 75 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 76 } 77 78 static void xfrm_hash_transfer(struct hlist_head *list, 79 struct hlist_head *ndsttable, 80 struct hlist_head *nsrctable, 81 struct hlist_head *nspitable, 82 unsigned int nhashmask) 83 { 84 struct hlist_node *tmp; 85 struct xfrm_state *x; 86 87 hlist_for_each_entry_safe(x, tmp, list, bydst) { 88 unsigned int h; 89 90 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 91 x->props.reqid, x->props.family, 92 nhashmask); 93 hlist_add_head_rcu(&x->bydst, ndsttable + h); 94 95 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 96 x->props.family, 97 nhashmask); 98 hlist_add_head_rcu(&x->bysrc, nsrctable + h); 99 100 if (x->id.spi) { 101 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 102 x->id.proto, x->props.family, 103 nhashmask); 104 hlist_add_head_rcu(&x->byspi, nspitable + h); 105 } 106 } 107 } 108 109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 110 { 111 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 112 } 113 114 static void xfrm_hash_resize(struct work_struct *work) 115 { 116 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 117 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 118 unsigned long nsize, osize; 119 unsigned int nhashmask, ohashmask; 120 int i; 121 122 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 123 ndst = xfrm_hash_alloc(nsize); 124 if (!ndst) 125 return; 126 nsrc = xfrm_hash_alloc(nsize); 127 if (!nsrc) { 128 xfrm_hash_free(ndst, nsize); 129 return; 130 } 131 nspi = xfrm_hash_alloc(nsize); 132 if (!nspi) { 133 xfrm_hash_free(ndst, nsize); 134 xfrm_hash_free(nsrc, nsize); 135 return; 136 } 137 138 spin_lock_bh(&net->xfrm.xfrm_state_lock); 139 write_seqcount_begin(&xfrm_state_hash_generation); 140 141 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 142 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); 143 for (i = net->xfrm.state_hmask; i >= 0; i--) 144 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask); 145 146 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); 147 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); 148 ohashmask = net->xfrm.state_hmask; 149 150 rcu_assign_pointer(net->xfrm.state_bydst, ndst); 151 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); 152 rcu_assign_pointer(net->xfrm.state_byspi, nspi); 153 net->xfrm.state_hmask = nhashmask; 154 155 write_seqcount_end(&xfrm_state_hash_generation); 156 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 157 158 osize = (ohashmask + 1) * sizeof(struct hlist_head); 159 160 synchronize_rcu(); 161 162 xfrm_hash_free(odst, osize); 163 xfrm_hash_free(osrc, osize); 164 xfrm_hash_free(ospi, osize); 165 } 166 167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 168 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 169 170 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 171 172 int __xfrm_state_delete(struct xfrm_state *x); 173 174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 175 bool km_is_alive(const struct km_event *c); 176 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 177 178 static DEFINE_SPINLOCK(xfrm_type_lock); 179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 180 { 181 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 182 const struct xfrm_type **typemap; 183 int err = 0; 184 185 if (unlikely(afinfo == NULL)) 186 return -EAFNOSUPPORT; 187 typemap = afinfo->type_map; 188 spin_lock_bh(&xfrm_type_lock); 189 190 if (likely(typemap[type->proto] == NULL)) 191 typemap[type->proto] = type; 192 else 193 err = -EEXIST; 194 spin_unlock_bh(&xfrm_type_lock); 195 rcu_read_unlock(); 196 return err; 197 } 198 EXPORT_SYMBOL(xfrm_register_type); 199 200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 201 { 202 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 203 const struct xfrm_type **typemap; 204 int err = 0; 205 206 if (unlikely(afinfo == NULL)) 207 return -EAFNOSUPPORT; 208 typemap = afinfo->type_map; 209 spin_lock_bh(&xfrm_type_lock); 210 211 if (unlikely(typemap[type->proto] != type)) 212 err = -ENOENT; 213 else 214 typemap[type->proto] = NULL; 215 spin_unlock_bh(&xfrm_type_lock); 216 rcu_read_unlock(); 217 return err; 218 } 219 EXPORT_SYMBOL(xfrm_unregister_type); 220 221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 222 { 223 struct xfrm_state_afinfo *afinfo; 224 const struct xfrm_type **typemap; 225 const struct xfrm_type *type; 226 int modload_attempted = 0; 227 228 retry: 229 afinfo = xfrm_state_get_afinfo(family); 230 if (unlikely(afinfo == NULL)) 231 return NULL; 232 typemap = afinfo->type_map; 233 234 type = READ_ONCE(typemap[proto]); 235 if (unlikely(type && !try_module_get(type->owner))) 236 type = NULL; 237 238 rcu_read_unlock(); 239 240 if (!type && !modload_attempted) { 241 request_module("xfrm-type-%d-%d", family, proto); 242 modload_attempted = 1; 243 goto retry; 244 } 245 246 return type; 247 } 248 249 static void xfrm_put_type(const struct xfrm_type *type) 250 { 251 module_put(type->owner); 252 } 253 254 static DEFINE_SPINLOCK(xfrm_type_offload_lock); 255 int xfrm_register_type_offload(const struct xfrm_type_offload *type, 256 unsigned short family) 257 { 258 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 259 const struct xfrm_type_offload **typemap; 260 int err = 0; 261 262 if (unlikely(afinfo == NULL)) 263 return -EAFNOSUPPORT; 264 typemap = afinfo->type_offload_map; 265 spin_lock_bh(&xfrm_type_offload_lock); 266 267 if (likely(typemap[type->proto] == NULL)) 268 typemap[type->proto] = type; 269 else 270 err = -EEXIST; 271 spin_unlock_bh(&xfrm_type_offload_lock); 272 rcu_read_unlock(); 273 return err; 274 } 275 EXPORT_SYMBOL(xfrm_register_type_offload); 276 277 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, 278 unsigned short family) 279 { 280 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 281 const struct xfrm_type_offload **typemap; 282 int err = 0; 283 284 if (unlikely(afinfo == NULL)) 285 return -EAFNOSUPPORT; 286 typemap = afinfo->type_offload_map; 287 spin_lock_bh(&xfrm_type_offload_lock); 288 289 if (unlikely(typemap[type->proto] != type)) 290 err = -ENOENT; 291 else 292 typemap[type->proto] = NULL; 293 spin_unlock_bh(&xfrm_type_offload_lock); 294 rcu_read_unlock(); 295 return err; 296 } 297 EXPORT_SYMBOL(xfrm_unregister_type_offload); 298 299 static const struct xfrm_type_offload * 300 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load) 301 { 302 struct xfrm_state_afinfo *afinfo; 303 const struct xfrm_type_offload **typemap; 304 const struct xfrm_type_offload *type; 305 306 retry: 307 afinfo = xfrm_state_get_afinfo(family); 308 if (unlikely(afinfo == NULL)) 309 return NULL; 310 typemap = afinfo->type_offload_map; 311 312 type = typemap[proto]; 313 if ((type && !try_module_get(type->owner))) 314 type = NULL; 315 316 if (!type && try_load) { 317 request_module("xfrm-offload-%d-%d", family, proto); 318 try_load = 0; 319 goto retry; 320 } 321 322 rcu_read_unlock(); 323 return type; 324 } 325 326 static void xfrm_put_type_offload(const struct xfrm_type_offload *type) 327 { 328 module_put(type->owner); 329 } 330 331 static DEFINE_SPINLOCK(xfrm_mode_lock); 332 int xfrm_register_mode(struct xfrm_mode *mode, int family) 333 { 334 struct xfrm_state_afinfo *afinfo; 335 struct xfrm_mode **modemap; 336 int err; 337 338 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 339 return -EINVAL; 340 341 afinfo = xfrm_state_get_afinfo(family); 342 if (unlikely(afinfo == NULL)) 343 return -EAFNOSUPPORT; 344 345 err = -EEXIST; 346 modemap = afinfo->mode_map; 347 spin_lock_bh(&xfrm_mode_lock); 348 if (modemap[mode->encap]) 349 goto out; 350 351 err = -ENOENT; 352 if (!try_module_get(afinfo->owner)) 353 goto out; 354 355 mode->afinfo = afinfo; 356 modemap[mode->encap] = mode; 357 err = 0; 358 359 out: 360 spin_unlock_bh(&xfrm_mode_lock); 361 rcu_read_unlock(); 362 return err; 363 } 364 EXPORT_SYMBOL(xfrm_register_mode); 365 366 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 367 { 368 struct xfrm_state_afinfo *afinfo; 369 struct xfrm_mode **modemap; 370 int err; 371 372 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 373 return -EINVAL; 374 375 afinfo = xfrm_state_get_afinfo(family); 376 if (unlikely(afinfo == NULL)) 377 return -EAFNOSUPPORT; 378 379 err = -ENOENT; 380 modemap = afinfo->mode_map; 381 spin_lock_bh(&xfrm_mode_lock); 382 if (likely(modemap[mode->encap] == mode)) { 383 modemap[mode->encap] = NULL; 384 module_put(mode->afinfo->owner); 385 err = 0; 386 } 387 388 spin_unlock_bh(&xfrm_mode_lock); 389 rcu_read_unlock(); 390 return err; 391 } 392 EXPORT_SYMBOL(xfrm_unregister_mode); 393 394 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 395 { 396 struct xfrm_state_afinfo *afinfo; 397 struct xfrm_mode *mode; 398 int modload_attempted = 0; 399 400 if (unlikely(encap >= XFRM_MODE_MAX)) 401 return NULL; 402 403 retry: 404 afinfo = xfrm_state_get_afinfo(family); 405 if (unlikely(afinfo == NULL)) 406 return NULL; 407 408 mode = READ_ONCE(afinfo->mode_map[encap]); 409 if (unlikely(mode && !try_module_get(mode->owner))) 410 mode = NULL; 411 412 rcu_read_unlock(); 413 if (!mode && !modload_attempted) { 414 request_module("xfrm-mode-%d-%d", family, encap); 415 modload_attempted = 1; 416 goto retry; 417 } 418 419 return mode; 420 } 421 422 static void xfrm_put_mode(struct xfrm_mode *mode) 423 { 424 module_put(mode->owner); 425 } 426 427 static void xfrm_state_gc_destroy(struct xfrm_state *x) 428 { 429 tasklet_hrtimer_cancel(&x->mtimer); 430 del_timer_sync(&x->rtimer); 431 kfree(x->aead); 432 kfree(x->aalg); 433 kfree(x->ealg); 434 kfree(x->calg); 435 kfree(x->encap); 436 kfree(x->coaddr); 437 kfree(x->replay_esn); 438 kfree(x->preplay_esn); 439 if (x->inner_mode) 440 xfrm_put_mode(x->inner_mode); 441 if (x->inner_mode_iaf) 442 xfrm_put_mode(x->inner_mode_iaf); 443 if (x->outer_mode) 444 xfrm_put_mode(x->outer_mode); 445 if (x->type_offload) 446 xfrm_put_type_offload(x->type_offload); 447 if (x->type) { 448 x->type->destructor(x); 449 xfrm_put_type(x->type); 450 } 451 xfrm_dev_state_free(x); 452 security_xfrm_state_free(x); 453 kfree(x); 454 } 455 456 static void xfrm_state_gc_task(struct work_struct *work) 457 { 458 struct xfrm_state *x; 459 struct hlist_node *tmp; 460 struct hlist_head gc_list; 461 462 spin_lock_bh(&xfrm_state_gc_lock); 463 hlist_move_list(&xfrm_state_gc_list, &gc_list); 464 spin_unlock_bh(&xfrm_state_gc_lock); 465 466 synchronize_rcu(); 467 468 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 469 xfrm_state_gc_destroy(x); 470 } 471 472 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 473 { 474 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 475 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 476 unsigned long now = get_seconds(); 477 long next = LONG_MAX; 478 int warn = 0; 479 int err = 0; 480 481 spin_lock(&x->lock); 482 if (x->km.state == XFRM_STATE_DEAD) 483 goto out; 484 if (x->km.state == XFRM_STATE_EXPIRED) 485 goto expired; 486 if (x->lft.hard_add_expires_seconds) { 487 long tmo = x->lft.hard_add_expires_seconds + 488 x->curlft.add_time - now; 489 if (tmo <= 0) { 490 if (x->xflags & XFRM_SOFT_EXPIRE) { 491 /* enter hard expire without soft expire first?! 492 * setting a new date could trigger this. 493 * workaround: fix x->curflt.add_time by below: 494 */ 495 x->curlft.add_time = now - x->saved_tmo - 1; 496 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 497 } else 498 goto expired; 499 } 500 if (tmo < next) 501 next = tmo; 502 } 503 if (x->lft.hard_use_expires_seconds) { 504 long tmo = x->lft.hard_use_expires_seconds + 505 (x->curlft.use_time ? : now) - now; 506 if (tmo <= 0) 507 goto expired; 508 if (tmo < next) 509 next = tmo; 510 } 511 if (x->km.dying) 512 goto resched; 513 if (x->lft.soft_add_expires_seconds) { 514 long tmo = x->lft.soft_add_expires_seconds + 515 x->curlft.add_time - now; 516 if (tmo <= 0) { 517 warn = 1; 518 x->xflags &= ~XFRM_SOFT_EXPIRE; 519 } else if (tmo < next) { 520 next = tmo; 521 x->xflags |= XFRM_SOFT_EXPIRE; 522 x->saved_tmo = tmo; 523 } 524 } 525 if (x->lft.soft_use_expires_seconds) { 526 long tmo = x->lft.soft_use_expires_seconds + 527 (x->curlft.use_time ? : now) - now; 528 if (tmo <= 0) 529 warn = 1; 530 else if (tmo < next) 531 next = tmo; 532 } 533 534 x->km.dying = warn; 535 if (warn) 536 km_state_expired(x, 0, 0); 537 resched: 538 if (next != LONG_MAX) { 539 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 540 } 541 542 goto out; 543 544 expired: 545 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 546 x->km.state = XFRM_STATE_EXPIRED; 547 548 err = __xfrm_state_delete(x); 549 if (!err) 550 km_state_expired(x, 1, 0); 551 552 xfrm_audit_state_delete(x, err ? 0 : 1, true); 553 554 out: 555 spin_unlock(&x->lock); 556 return HRTIMER_NORESTART; 557 } 558 559 static void xfrm_replay_timer_handler(unsigned long data); 560 561 struct xfrm_state *xfrm_state_alloc(struct net *net) 562 { 563 struct xfrm_state *x; 564 565 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 566 567 if (x) { 568 write_pnet(&x->xs_net, net); 569 refcount_set(&x->refcnt, 1); 570 atomic_set(&x->tunnel_users, 0); 571 INIT_LIST_HEAD(&x->km.all); 572 INIT_HLIST_NODE(&x->bydst); 573 INIT_HLIST_NODE(&x->bysrc); 574 INIT_HLIST_NODE(&x->byspi); 575 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, 576 CLOCK_BOOTTIME, HRTIMER_MODE_ABS); 577 setup_timer(&x->rtimer, xfrm_replay_timer_handler, 578 (unsigned long)x); 579 x->curlft.add_time = get_seconds(); 580 x->lft.soft_byte_limit = XFRM_INF; 581 x->lft.soft_packet_limit = XFRM_INF; 582 x->lft.hard_byte_limit = XFRM_INF; 583 x->lft.hard_packet_limit = XFRM_INF; 584 x->replay_maxage = 0; 585 x->replay_maxdiff = 0; 586 x->inner_mode = NULL; 587 x->inner_mode_iaf = NULL; 588 spin_lock_init(&x->lock); 589 } 590 return x; 591 } 592 EXPORT_SYMBOL(xfrm_state_alloc); 593 594 void __xfrm_state_destroy(struct xfrm_state *x) 595 { 596 WARN_ON(x->km.state != XFRM_STATE_DEAD); 597 598 spin_lock_bh(&xfrm_state_gc_lock); 599 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 600 spin_unlock_bh(&xfrm_state_gc_lock); 601 schedule_work(&xfrm_state_gc_work); 602 } 603 EXPORT_SYMBOL(__xfrm_state_destroy); 604 605 int __xfrm_state_delete(struct xfrm_state *x) 606 { 607 struct net *net = xs_net(x); 608 int err = -ESRCH; 609 610 if (x->km.state != XFRM_STATE_DEAD) { 611 x->km.state = XFRM_STATE_DEAD; 612 spin_lock(&net->xfrm.xfrm_state_lock); 613 list_del(&x->km.all); 614 hlist_del_rcu(&x->bydst); 615 hlist_del_rcu(&x->bysrc); 616 if (x->id.spi) 617 hlist_del_rcu(&x->byspi); 618 net->xfrm.state_num--; 619 spin_unlock(&net->xfrm.xfrm_state_lock); 620 621 xfrm_dev_state_delete(x); 622 623 /* All xfrm_state objects are created by xfrm_state_alloc. 624 * The xfrm_state_alloc call gives a reference, and that 625 * is what we are dropping here. 626 */ 627 xfrm_state_put(x); 628 err = 0; 629 } 630 631 return err; 632 } 633 EXPORT_SYMBOL(__xfrm_state_delete); 634 635 int xfrm_state_delete(struct xfrm_state *x) 636 { 637 int err; 638 639 spin_lock_bh(&x->lock); 640 err = __xfrm_state_delete(x); 641 spin_unlock_bh(&x->lock); 642 643 return err; 644 } 645 EXPORT_SYMBOL(xfrm_state_delete); 646 647 #ifdef CONFIG_SECURITY_NETWORK_XFRM 648 static inline int 649 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 650 { 651 int i, err = 0; 652 653 for (i = 0; i <= net->xfrm.state_hmask; i++) { 654 struct xfrm_state *x; 655 656 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 657 if (xfrm_id_proto_match(x->id.proto, proto) && 658 (err = security_xfrm_state_delete(x)) != 0) { 659 xfrm_audit_state_delete(x, 0, task_valid); 660 return err; 661 } 662 } 663 } 664 665 return err; 666 } 667 668 static inline int 669 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 670 { 671 int i, err = 0; 672 673 for (i = 0; i <= net->xfrm.state_hmask; i++) { 674 struct xfrm_state *x; 675 struct xfrm_state_offload *xso; 676 677 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 678 xso = &x->xso; 679 680 if (xso->dev == dev && 681 (err = security_xfrm_state_delete(x)) != 0) { 682 xfrm_audit_state_delete(x, 0, task_valid); 683 return err; 684 } 685 } 686 } 687 688 return err; 689 } 690 #else 691 static inline int 692 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 693 { 694 return 0; 695 } 696 697 static inline int 698 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 699 { 700 return 0; 701 } 702 #endif 703 704 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) 705 { 706 int i, err = 0, cnt = 0; 707 708 spin_lock_bh(&net->xfrm.xfrm_state_lock); 709 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 710 if (err) 711 goto out; 712 713 err = -ESRCH; 714 for (i = 0; i <= net->xfrm.state_hmask; i++) { 715 struct xfrm_state *x; 716 restart: 717 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 718 if (!xfrm_state_kern(x) && 719 xfrm_id_proto_match(x->id.proto, proto)) { 720 xfrm_state_hold(x); 721 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 722 723 err = xfrm_state_delete(x); 724 xfrm_audit_state_delete(x, err ? 0 : 1, 725 task_valid); 726 xfrm_state_put(x); 727 if (!err) 728 cnt++; 729 730 spin_lock_bh(&net->xfrm.xfrm_state_lock); 731 goto restart; 732 } 733 } 734 } 735 if (cnt) { 736 err = 0; 737 xfrm_policy_cache_flush(); 738 } 739 out: 740 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 741 return err; 742 } 743 EXPORT_SYMBOL(xfrm_state_flush); 744 745 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 746 { 747 int i, err = 0, cnt = 0; 748 749 spin_lock_bh(&net->xfrm.xfrm_state_lock); 750 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 751 if (err) 752 goto out; 753 754 err = -ESRCH; 755 for (i = 0; i <= net->xfrm.state_hmask; i++) { 756 struct xfrm_state *x; 757 struct xfrm_state_offload *xso; 758 restart: 759 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 760 xso = &x->xso; 761 762 if (!xfrm_state_kern(x) && xso->dev == dev) { 763 xfrm_state_hold(x); 764 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 765 766 err = xfrm_state_delete(x); 767 xfrm_audit_state_delete(x, err ? 0 : 1, 768 task_valid); 769 xfrm_state_put(x); 770 if (!err) 771 cnt++; 772 773 spin_lock_bh(&net->xfrm.xfrm_state_lock); 774 goto restart; 775 } 776 } 777 } 778 if (cnt) 779 err = 0; 780 781 out: 782 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 783 return err; 784 } 785 EXPORT_SYMBOL(xfrm_dev_state_flush); 786 787 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 788 { 789 spin_lock_bh(&net->xfrm.xfrm_state_lock); 790 si->sadcnt = net->xfrm.state_num; 791 si->sadhcnt = net->xfrm.state_hmask; 792 si->sadhmcnt = xfrm_state_hashmax; 793 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 794 } 795 EXPORT_SYMBOL(xfrm_sad_getinfo); 796 797 static void 798 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 799 const struct xfrm_tmpl *tmpl, 800 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 801 unsigned short family) 802 { 803 struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family); 804 805 if (!afinfo) 806 return; 807 808 afinfo->init_tempsel(&x->sel, fl); 809 810 if (family != tmpl->encap_family) { 811 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family); 812 if (!afinfo) 813 return; 814 } 815 afinfo->init_temprop(x, tmpl, daddr, saddr); 816 } 817 818 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 819 const xfrm_address_t *daddr, 820 __be32 spi, u8 proto, 821 unsigned short family) 822 { 823 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 824 struct xfrm_state *x; 825 826 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { 827 if (x->props.family != family || 828 x->id.spi != spi || 829 x->id.proto != proto || 830 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 831 continue; 832 833 if ((mark & x->mark.m) != x->mark.v) 834 continue; 835 if (!xfrm_state_hold_rcu(x)) 836 continue; 837 return x; 838 } 839 840 return NULL; 841 } 842 843 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 844 const xfrm_address_t *daddr, 845 const xfrm_address_t *saddr, 846 u8 proto, unsigned short family) 847 { 848 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 849 struct xfrm_state *x; 850 851 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { 852 if (x->props.family != family || 853 x->id.proto != proto || 854 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 855 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 856 continue; 857 858 if ((mark & x->mark.m) != x->mark.v) 859 continue; 860 if (!xfrm_state_hold_rcu(x)) 861 continue; 862 return x; 863 } 864 865 return NULL; 866 } 867 868 static inline struct xfrm_state * 869 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 870 { 871 struct net *net = xs_net(x); 872 u32 mark = x->mark.v & x->mark.m; 873 874 if (use_spi) 875 return __xfrm_state_lookup(net, mark, &x->id.daddr, 876 x->id.spi, x->id.proto, family); 877 else 878 return __xfrm_state_lookup_byaddr(net, mark, 879 &x->id.daddr, 880 &x->props.saddr, 881 x->id.proto, family); 882 } 883 884 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 885 { 886 if (have_hash_collision && 887 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 888 net->xfrm.state_num > net->xfrm.state_hmask) 889 schedule_work(&net->xfrm.state_hash_work); 890 } 891 892 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 893 const struct flowi *fl, unsigned short family, 894 struct xfrm_state **best, int *acq_in_progress, 895 int *error) 896 { 897 /* Resolution logic: 898 * 1. There is a valid state with matching selector. Done. 899 * 2. Valid state with inappropriate selector. Skip. 900 * 901 * Entering area of "sysdeps". 902 * 903 * 3. If state is not valid, selector is temporary, it selects 904 * only session which triggered previous resolution. Key 905 * manager will do something to install a state with proper 906 * selector. 907 */ 908 if (x->km.state == XFRM_STATE_VALID) { 909 if ((x->sel.family && 910 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 911 !security_xfrm_state_pol_flow_match(x, pol, fl)) 912 return; 913 914 if (!*best || 915 (*best)->km.dying > x->km.dying || 916 ((*best)->km.dying == x->km.dying && 917 (*best)->curlft.add_time < x->curlft.add_time)) 918 *best = x; 919 } else if (x->km.state == XFRM_STATE_ACQ) { 920 *acq_in_progress = 1; 921 } else if (x->km.state == XFRM_STATE_ERROR || 922 x->km.state == XFRM_STATE_EXPIRED) { 923 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 924 security_xfrm_state_pol_flow_match(x, pol, fl)) 925 *error = -ESRCH; 926 } 927 } 928 929 struct xfrm_state * 930 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 931 const struct flowi *fl, struct xfrm_tmpl *tmpl, 932 struct xfrm_policy *pol, int *err, 933 unsigned short family) 934 { 935 static xfrm_address_t saddr_wildcard = { }; 936 struct net *net = xp_net(pol); 937 unsigned int h, h_wildcard; 938 struct xfrm_state *x, *x0, *to_put; 939 int acquire_in_progress = 0; 940 int error = 0; 941 struct xfrm_state *best = NULL; 942 u32 mark = pol->mark.v & pol->mark.m; 943 unsigned short encap_family = tmpl->encap_family; 944 unsigned int sequence; 945 struct km_event c; 946 947 to_put = NULL; 948 949 sequence = read_seqcount_begin(&xfrm_state_hash_generation); 950 951 rcu_read_lock(); 952 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 953 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { 954 if (x->props.family == encap_family && 955 x->props.reqid == tmpl->reqid && 956 (mark & x->mark.m) == x->mark.v && 957 !(x->props.flags & XFRM_STATE_WILDRECV) && 958 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 959 tmpl->mode == x->props.mode && 960 tmpl->id.proto == x->id.proto && 961 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 962 xfrm_state_look_at(pol, x, fl, encap_family, 963 &best, &acquire_in_progress, &error); 964 } 965 if (best || acquire_in_progress) 966 goto found; 967 968 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 969 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { 970 if (x->props.family == encap_family && 971 x->props.reqid == tmpl->reqid && 972 (mark & x->mark.m) == x->mark.v && 973 !(x->props.flags & XFRM_STATE_WILDRECV) && 974 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 975 tmpl->mode == x->props.mode && 976 tmpl->id.proto == x->id.proto && 977 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 978 xfrm_state_look_at(pol, x, fl, encap_family, 979 &best, &acquire_in_progress, &error); 980 } 981 982 found: 983 x = best; 984 if (!x && !error && !acquire_in_progress) { 985 if (tmpl->id.spi && 986 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 987 tmpl->id.proto, encap_family)) != NULL) { 988 to_put = x0; 989 error = -EEXIST; 990 goto out; 991 } 992 993 c.net = net; 994 /* If the KMs have no listeners (yet...), avoid allocating an SA 995 * for each and every packet - garbage collection might not 996 * handle the flood. 997 */ 998 if (!km_is_alive(&c)) { 999 error = -ESRCH; 1000 goto out; 1001 } 1002 1003 x = xfrm_state_alloc(net); 1004 if (x == NULL) { 1005 error = -ENOMEM; 1006 goto out; 1007 } 1008 /* Initialize temporary state matching only 1009 * to current session. */ 1010 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1011 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1012 1013 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1014 if (error) { 1015 x->km.state = XFRM_STATE_DEAD; 1016 to_put = x; 1017 x = NULL; 1018 goto out; 1019 } 1020 1021 if (km_query(x, tmpl, pol) == 0) { 1022 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1023 x->km.state = XFRM_STATE_ACQ; 1024 list_add(&x->km.all, &net->xfrm.state_all); 1025 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1026 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1027 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1028 if (x->id.spi) { 1029 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1030 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1031 } 1032 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1033 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1034 net->xfrm.state_num++; 1035 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1036 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1037 } else { 1038 x->km.state = XFRM_STATE_DEAD; 1039 to_put = x; 1040 x = NULL; 1041 error = -ESRCH; 1042 } 1043 } 1044 out: 1045 if (x) { 1046 if (!xfrm_state_hold_rcu(x)) { 1047 *err = -EAGAIN; 1048 x = NULL; 1049 } 1050 } else { 1051 *err = acquire_in_progress ? -EAGAIN : error; 1052 } 1053 rcu_read_unlock(); 1054 if (to_put) 1055 xfrm_state_put(to_put); 1056 1057 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { 1058 *err = -EAGAIN; 1059 if (x) { 1060 xfrm_state_put(x); 1061 x = NULL; 1062 } 1063 } 1064 1065 return x; 1066 } 1067 1068 struct xfrm_state * 1069 xfrm_stateonly_find(struct net *net, u32 mark, 1070 xfrm_address_t *daddr, xfrm_address_t *saddr, 1071 unsigned short family, u8 mode, u8 proto, u32 reqid) 1072 { 1073 unsigned int h; 1074 struct xfrm_state *rx = NULL, *x = NULL; 1075 1076 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1077 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1078 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1079 if (x->props.family == family && 1080 x->props.reqid == reqid && 1081 (mark & x->mark.m) == x->mark.v && 1082 !(x->props.flags & XFRM_STATE_WILDRECV) && 1083 xfrm_state_addr_check(x, daddr, saddr, family) && 1084 mode == x->props.mode && 1085 proto == x->id.proto && 1086 x->km.state == XFRM_STATE_VALID) { 1087 rx = x; 1088 break; 1089 } 1090 } 1091 1092 if (rx) 1093 xfrm_state_hold(rx); 1094 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1095 1096 1097 return rx; 1098 } 1099 EXPORT_SYMBOL(xfrm_stateonly_find); 1100 1101 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1102 unsigned short family) 1103 { 1104 struct xfrm_state *x; 1105 struct xfrm_state_walk *w; 1106 1107 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1108 list_for_each_entry(w, &net->xfrm.state_all, all) { 1109 x = container_of(w, struct xfrm_state, km); 1110 if (x->props.family != family || 1111 x->id.spi != spi) 1112 continue; 1113 1114 xfrm_state_hold(x); 1115 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1116 return x; 1117 } 1118 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1119 return NULL; 1120 } 1121 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1122 1123 static void __xfrm_state_insert(struct xfrm_state *x) 1124 { 1125 struct net *net = xs_net(x); 1126 unsigned int h; 1127 1128 list_add(&x->km.all, &net->xfrm.state_all); 1129 1130 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1131 x->props.reqid, x->props.family); 1132 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1133 1134 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1135 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1136 1137 if (x->id.spi) { 1138 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1139 x->props.family); 1140 1141 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1142 } 1143 1144 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1145 if (x->replay_maxage) 1146 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1147 1148 net->xfrm.state_num++; 1149 1150 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1151 } 1152 1153 /* net->xfrm.xfrm_state_lock is held */ 1154 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1155 { 1156 struct net *net = xs_net(xnew); 1157 unsigned short family = xnew->props.family; 1158 u32 reqid = xnew->props.reqid; 1159 struct xfrm_state *x; 1160 unsigned int h; 1161 u32 mark = xnew->mark.v & xnew->mark.m; 1162 1163 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1164 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1165 if (x->props.family == family && 1166 x->props.reqid == reqid && 1167 (mark & x->mark.m) == x->mark.v && 1168 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1169 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1170 x->genid++; 1171 } 1172 } 1173 1174 void xfrm_state_insert(struct xfrm_state *x) 1175 { 1176 struct net *net = xs_net(x); 1177 1178 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1179 __xfrm_state_bump_genids(x); 1180 __xfrm_state_insert(x); 1181 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1182 } 1183 EXPORT_SYMBOL(xfrm_state_insert); 1184 1185 /* net->xfrm.xfrm_state_lock is held */ 1186 static struct xfrm_state *__find_acq_core(struct net *net, 1187 const struct xfrm_mark *m, 1188 unsigned short family, u8 mode, 1189 u32 reqid, u8 proto, 1190 const xfrm_address_t *daddr, 1191 const xfrm_address_t *saddr, 1192 int create) 1193 { 1194 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1195 struct xfrm_state *x; 1196 u32 mark = m->v & m->m; 1197 1198 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1199 if (x->props.reqid != reqid || 1200 x->props.mode != mode || 1201 x->props.family != family || 1202 x->km.state != XFRM_STATE_ACQ || 1203 x->id.spi != 0 || 1204 x->id.proto != proto || 1205 (mark & x->mark.m) != x->mark.v || 1206 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1207 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1208 continue; 1209 1210 xfrm_state_hold(x); 1211 return x; 1212 } 1213 1214 if (!create) 1215 return NULL; 1216 1217 x = xfrm_state_alloc(net); 1218 if (likely(x)) { 1219 switch (family) { 1220 case AF_INET: 1221 x->sel.daddr.a4 = daddr->a4; 1222 x->sel.saddr.a4 = saddr->a4; 1223 x->sel.prefixlen_d = 32; 1224 x->sel.prefixlen_s = 32; 1225 x->props.saddr.a4 = saddr->a4; 1226 x->id.daddr.a4 = daddr->a4; 1227 break; 1228 1229 case AF_INET6: 1230 x->sel.daddr.in6 = daddr->in6; 1231 x->sel.saddr.in6 = saddr->in6; 1232 x->sel.prefixlen_d = 128; 1233 x->sel.prefixlen_s = 128; 1234 x->props.saddr.in6 = saddr->in6; 1235 x->id.daddr.in6 = daddr->in6; 1236 break; 1237 } 1238 1239 x->km.state = XFRM_STATE_ACQ; 1240 x->id.proto = proto; 1241 x->props.family = family; 1242 x->props.mode = mode; 1243 x->props.reqid = reqid; 1244 x->mark.v = m->v; 1245 x->mark.m = m->m; 1246 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1247 xfrm_state_hold(x); 1248 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1249 list_add(&x->km.all, &net->xfrm.state_all); 1250 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1251 h = xfrm_src_hash(net, daddr, saddr, family); 1252 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1253 1254 net->xfrm.state_num++; 1255 1256 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1257 } 1258 1259 return x; 1260 } 1261 1262 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1263 1264 int xfrm_state_add(struct xfrm_state *x) 1265 { 1266 struct net *net = xs_net(x); 1267 struct xfrm_state *x1, *to_put; 1268 int family; 1269 int err; 1270 u32 mark = x->mark.v & x->mark.m; 1271 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1272 1273 family = x->props.family; 1274 1275 to_put = NULL; 1276 1277 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1278 1279 x1 = __xfrm_state_locate(x, use_spi, family); 1280 if (x1) { 1281 to_put = x1; 1282 x1 = NULL; 1283 err = -EEXIST; 1284 goto out; 1285 } 1286 1287 if (use_spi && x->km.seq) { 1288 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1289 if (x1 && ((x1->id.proto != x->id.proto) || 1290 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1291 to_put = x1; 1292 x1 = NULL; 1293 } 1294 } 1295 1296 if (use_spi && !x1) 1297 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1298 x->props.reqid, x->id.proto, 1299 &x->id.daddr, &x->props.saddr, 0); 1300 1301 __xfrm_state_bump_genids(x); 1302 __xfrm_state_insert(x); 1303 err = 0; 1304 1305 out: 1306 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1307 1308 if (x1) { 1309 xfrm_state_delete(x1); 1310 xfrm_state_put(x1); 1311 } 1312 1313 if (to_put) 1314 xfrm_state_put(to_put); 1315 1316 return err; 1317 } 1318 EXPORT_SYMBOL(xfrm_state_add); 1319 1320 #ifdef CONFIG_XFRM_MIGRATE 1321 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1322 struct xfrm_encap_tmpl *encap) 1323 { 1324 struct net *net = xs_net(orig); 1325 struct xfrm_state *x = xfrm_state_alloc(net); 1326 if (!x) 1327 goto out; 1328 1329 memcpy(&x->id, &orig->id, sizeof(x->id)); 1330 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1331 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1332 x->props.mode = orig->props.mode; 1333 x->props.replay_window = orig->props.replay_window; 1334 x->props.reqid = orig->props.reqid; 1335 x->props.family = orig->props.family; 1336 x->props.saddr = orig->props.saddr; 1337 1338 if (orig->aalg) { 1339 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1340 if (!x->aalg) 1341 goto error; 1342 } 1343 x->props.aalgo = orig->props.aalgo; 1344 1345 if (orig->aead) { 1346 x->aead = xfrm_algo_aead_clone(orig->aead); 1347 if (!x->aead) 1348 goto error; 1349 } 1350 if (orig->ealg) { 1351 x->ealg = xfrm_algo_clone(orig->ealg); 1352 if (!x->ealg) 1353 goto error; 1354 } 1355 x->props.ealgo = orig->props.ealgo; 1356 1357 if (orig->calg) { 1358 x->calg = xfrm_algo_clone(orig->calg); 1359 if (!x->calg) 1360 goto error; 1361 } 1362 x->props.calgo = orig->props.calgo; 1363 1364 if (encap || orig->encap) { 1365 if (encap) 1366 x->encap = kmemdup(encap, sizeof(*x->encap), 1367 GFP_KERNEL); 1368 else 1369 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1370 GFP_KERNEL); 1371 1372 if (!x->encap) 1373 goto error; 1374 } 1375 1376 if (orig->coaddr) { 1377 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1378 GFP_KERNEL); 1379 if (!x->coaddr) 1380 goto error; 1381 } 1382 1383 if (orig->replay_esn) { 1384 if (xfrm_replay_clone(x, orig)) 1385 goto error; 1386 } 1387 1388 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1389 1390 if (xfrm_init_state(x) < 0) 1391 goto error; 1392 1393 x->props.flags = orig->props.flags; 1394 x->props.extra_flags = orig->props.extra_flags; 1395 1396 x->tfcpad = orig->tfcpad; 1397 x->replay_maxdiff = orig->replay_maxdiff; 1398 x->replay_maxage = orig->replay_maxage; 1399 x->curlft.add_time = orig->curlft.add_time; 1400 x->km.state = orig->km.state; 1401 x->km.seq = orig->km.seq; 1402 x->replay = orig->replay; 1403 x->preplay = orig->preplay; 1404 1405 return x; 1406 1407 error: 1408 xfrm_state_put(x); 1409 out: 1410 return NULL; 1411 } 1412 1413 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1414 { 1415 unsigned int h; 1416 struct xfrm_state *x = NULL; 1417 1418 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1419 1420 if (m->reqid) { 1421 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1422 m->reqid, m->old_family); 1423 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1424 if (x->props.mode != m->mode || 1425 x->id.proto != m->proto) 1426 continue; 1427 if (m->reqid && x->props.reqid != m->reqid) 1428 continue; 1429 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1430 m->old_family) || 1431 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1432 m->old_family)) 1433 continue; 1434 xfrm_state_hold(x); 1435 break; 1436 } 1437 } else { 1438 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1439 m->old_family); 1440 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1441 if (x->props.mode != m->mode || 1442 x->id.proto != m->proto) 1443 continue; 1444 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1445 m->old_family) || 1446 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1447 m->old_family)) 1448 continue; 1449 xfrm_state_hold(x); 1450 break; 1451 } 1452 } 1453 1454 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1455 1456 return x; 1457 } 1458 EXPORT_SYMBOL(xfrm_migrate_state_find); 1459 1460 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1461 struct xfrm_migrate *m, 1462 struct xfrm_encap_tmpl *encap) 1463 { 1464 struct xfrm_state *xc; 1465 1466 xc = xfrm_state_clone(x, encap); 1467 if (!xc) 1468 return NULL; 1469 1470 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1471 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1472 1473 /* add state */ 1474 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1475 /* a care is needed when the destination address of the 1476 state is to be updated as it is a part of triplet */ 1477 xfrm_state_insert(xc); 1478 } else { 1479 if (xfrm_state_add(xc) < 0) 1480 goto error; 1481 } 1482 1483 return xc; 1484 error: 1485 xfrm_state_put(xc); 1486 return NULL; 1487 } 1488 EXPORT_SYMBOL(xfrm_state_migrate); 1489 #endif 1490 1491 int xfrm_state_update(struct xfrm_state *x) 1492 { 1493 struct xfrm_state *x1, *to_put; 1494 int err; 1495 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1496 struct net *net = xs_net(x); 1497 1498 to_put = NULL; 1499 1500 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1501 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1502 1503 err = -ESRCH; 1504 if (!x1) 1505 goto out; 1506 1507 if (xfrm_state_kern(x1)) { 1508 to_put = x1; 1509 err = -EEXIST; 1510 goto out; 1511 } 1512 1513 if (x1->km.state == XFRM_STATE_ACQ) { 1514 __xfrm_state_insert(x); 1515 x = NULL; 1516 } 1517 err = 0; 1518 1519 out: 1520 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1521 1522 if (to_put) 1523 xfrm_state_put(to_put); 1524 1525 if (err) 1526 return err; 1527 1528 if (!x) { 1529 xfrm_state_delete(x1); 1530 xfrm_state_put(x1); 1531 return 0; 1532 } 1533 1534 err = -EINVAL; 1535 spin_lock_bh(&x1->lock); 1536 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1537 if (x->encap && x1->encap) 1538 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1539 if (x->coaddr && x1->coaddr) { 1540 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1541 } 1542 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1543 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1544 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1545 x1->km.dying = 0; 1546 1547 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1548 if (x1->curlft.use_time) 1549 xfrm_state_check_expire(x1); 1550 1551 err = 0; 1552 x->km.state = XFRM_STATE_DEAD; 1553 __xfrm_state_put(x); 1554 } 1555 spin_unlock_bh(&x1->lock); 1556 1557 xfrm_state_put(x1); 1558 1559 return err; 1560 } 1561 EXPORT_SYMBOL(xfrm_state_update); 1562 1563 int xfrm_state_check_expire(struct xfrm_state *x) 1564 { 1565 if (!x->curlft.use_time) 1566 x->curlft.use_time = get_seconds(); 1567 1568 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1569 x->curlft.packets >= x->lft.hard_packet_limit) { 1570 x->km.state = XFRM_STATE_EXPIRED; 1571 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL); 1572 return -EINVAL; 1573 } 1574 1575 if (!x->km.dying && 1576 (x->curlft.bytes >= x->lft.soft_byte_limit || 1577 x->curlft.packets >= x->lft.soft_packet_limit)) { 1578 x->km.dying = 1; 1579 km_state_expired(x, 0, 0); 1580 } 1581 return 0; 1582 } 1583 EXPORT_SYMBOL(xfrm_state_check_expire); 1584 1585 struct xfrm_state * 1586 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1587 u8 proto, unsigned short family) 1588 { 1589 struct xfrm_state *x; 1590 1591 rcu_read_lock(); 1592 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1593 rcu_read_unlock(); 1594 return x; 1595 } 1596 EXPORT_SYMBOL(xfrm_state_lookup); 1597 1598 struct xfrm_state * 1599 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1600 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1601 u8 proto, unsigned short family) 1602 { 1603 struct xfrm_state *x; 1604 1605 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1606 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1607 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1608 return x; 1609 } 1610 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1611 1612 struct xfrm_state * 1613 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1614 u8 proto, const xfrm_address_t *daddr, 1615 const xfrm_address_t *saddr, int create, unsigned short family) 1616 { 1617 struct xfrm_state *x; 1618 1619 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1620 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1621 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1622 1623 return x; 1624 } 1625 EXPORT_SYMBOL(xfrm_find_acq); 1626 1627 #ifdef CONFIG_XFRM_SUB_POLICY 1628 int 1629 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1630 unsigned short family, struct net *net) 1631 { 1632 int i; 1633 int err = 0; 1634 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1635 if (!afinfo) 1636 return -EAFNOSUPPORT; 1637 1638 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ 1639 if (afinfo->tmpl_sort) 1640 err = afinfo->tmpl_sort(dst, src, n); 1641 else 1642 for (i = 0; i < n; i++) 1643 dst[i] = src[i]; 1644 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1645 rcu_read_unlock(); 1646 return err; 1647 } 1648 EXPORT_SYMBOL(xfrm_tmpl_sort); 1649 1650 int 1651 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1652 unsigned short family) 1653 { 1654 int i; 1655 int err = 0; 1656 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1657 struct net *net = xs_net(*src); 1658 1659 if (!afinfo) 1660 return -EAFNOSUPPORT; 1661 1662 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1663 if (afinfo->state_sort) 1664 err = afinfo->state_sort(dst, src, n); 1665 else 1666 for (i = 0; i < n; i++) 1667 dst[i] = src[i]; 1668 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1669 rcu_read_unlock(); 1670 return err; 1671 } 1672 EXPORT_SYMBOL(xfrm_state_sort); 1673 #endif 1674 1675 /* Silly enough, but I'm lazy to build resolution list */ 1676 1677 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1678 { 1679 int i; 1680 1681 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1682 struct xfrm_state *x; 1683 1684 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1685 if (x->km.seq == seq && 1686 (mark & x->mark.m) == x->mark.v && 1687 x->km.state == XFRM_STATE_ACQ) { 1688 xfrm_state_hold(x); 1689 return x; 1690 } 1691 } 1692 } 1693 return NULL; 1694 } 1695 1696 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1697 { 1698 struct xfrm_state *x; 1699 1700 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1701 x = __xfrm_find_acq_byseq(net, mark, seq); 1702 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1703 return x; 1704 } 1705 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1706 1707 u32 xfrm_get_acqseq(void) 1708 { 1709 u32 res; 1710 static atomic_t acqseq; 1711 1712 do { 1713 res = atomic_inc_return(&acqseq); 1714 } while (!res); 1715 1716 return res; 1717 } 1718 EXPORT_SYMBOL(xfrm_get_acqseq); 1719 1720 int verify_spi_info(u8 proto, u32 min, u32 max) 1721 { 1722 switch (proto) { 1723 case IPPROTO_AH: 1724 case IPPROTO_ESP: 1725 break; 1726 1727 case IPPROTO_COMP: 1728 /* IPCOMP spi is 16-bits. */ 1729 if (max >= 0x10000) 1730 return -EINVAL; 1731 break; 1732 1733 default: 1734 return -EINVAL; 1735 } 1736 1737 if (min > max) 1738 return -EINVAL; 1739 1740 return 0; 1741 } 1742 EXPORT_SYMBOL(verify_spi_info); 1743 1744 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1745 { 1746 struct net *net = xs_net(x); 1747 unsigned int h; 1748 struct xfrm_state *x0; 1749 int err = -ENOENT; 1750 __be32 minspi = htonl(low); 1751 __be32 maxspi = htonl(high); 1752 u32 mark = x->mark.v & x->mark.m; 1753 1754 spin_lock_bh(&x->lock); 1755 if (x->km.state == XFRM_STATE_DEAD) 1756 goto unlock; 1757 1758 err = 0; 1759 if (x->id.spi) 1760 goto unlock; 1761 1762 err = -ENOENT; 1763 1764 if (minspi == maxspi) { 1765 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1766 if (x0) { 1767 xfrm_state_put(x0); 1768 goto unlock; 1769 } 1770 x->id.spi = minspi; 1771 } else { 1772 u32 spi = 0; 1773 for (h = 0; h < high-low+1; h++) { 1774 spi = low + prandom_u32()%(high-low+1); 1775 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1776 if (x0 == NULL) { 1777 x->id.spi = htonl(spi); 1778 break; 1779 } 1780 xfrm_state_put(x0); 1781 } 1782 } 1783 if (x->id.spi) { 1784 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1785 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1786 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1787 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1788 1789 err = 0; 1790 } 1791 1792 unlock: 1793 spin_unlock_bh(&x->lock); 1794 1795 return err; 1796 } 1797 EXPORT_SYMBOL(xfrm_alloc_spi); 1798 1799 static bool __xfrm_state_filter_match(struct xfrm_state *x, 1800 struct xfrm_address_filter *filter) 1801 { 1802 if (filter) { 1803 if ((filter->family == AF_INET || 1804 filter->family == AF_INET6) && 1805 x->props.family != filter->family) 1806 return false; 1807 1808 return addr_match(&x->props.saddr, &filter->saddr, 1809 filter->splen) && 1810 addr_match(&x->id.daddr, &filter->daddr, 1811 filter->dplen); 1812 } 1813 return true; 1814 } 1815 1816 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1817 int (*func)(struct xfrm_state *, int, void*), 1818 void *data) 1819 { 1820 struct xfrm_state *state; 1821 struct xfrm_state_walk *x; 1822 int err = 0; 1823 1824 if (walk->seq != 0 && list_empty(&walk->all)) 1825 return 0; 1826 1827 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1828 if (list_empty(&walk->all)) 1829 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1830 else 1831 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 1832 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1833 if (x->state == XFRM_STATE_DEAD) 1834 continue; 1835 state = container_of(x, struct xfrm_state, km); 1836 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1837 continue; 1838 if (!__xfrm_state_filter_match(state, walk->filter)) 1839 continue; 1840 err = func(state, walk->seq, data); 1841 if (err) { 1842 list_move_tail(&walk->all, &x->all); 1843 goto out; 1844 } 1845 walk->seq++; 1846 } 1847 if (walk->seq == 0) { 1848 err = -ENOENT; 1849 goto out; 1850 } 1851 list_del_init(&walk->all); 1852 out: 1853 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1854 return err; 1855 } 1856 EXPORT_SYMBOL(xfrm_state_walk); 1857 1858 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1859 struct xfrm_address_filter *filter) 1860 { 1861 INIT_LIST_HEAD(&walk->all); 1862 walk->proto = proto; 1863 walk->state = XFRM_STATE_DEAD; 1864 walk->seq = 0; 1865 walk->filter = filter; 1866 } 1867 EXPORT_SYMBOL(xfrm_state_walk_init); 1868 1869 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 1870 { 1871 kfree(walk->filter); 1872 1873 if (list_empty(&walk->all)) 1874 return; 1875 1876 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1877 list_del(&walk->all); 1878 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1879 } 1880 EXPORT_SYMBOL(xfrm_state_walk_done); 1881 1882 static void xfrm_replay_timer_handler(unsigned long data) 1883 { 1884 struct xfrm_state *x = (struct xfrm_state *)data; 1885 1886 spin_lock(&x->lock); 1887 1888 if (x->km.state == XFRM_STATE_VALID) { 1889 if (xfrm_aevent_is_on(xs_net(x))) 1890 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1891 else 1892 x->xflags |= XFRM_TIME_DEFER; 1893 } 1894 1895 spin_unlock(&x->lock); 1896 } 1897 1898 static LIST_HEAD(xfrm_km_list); 1899 1900 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1901 { 1902 struct xfrm_mgr *km; 1903 1904 rcu_read_lock(); 1905 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1906 if (km->notify_policy) 1907 km->notify_policy(xp, dir, c); 1908 rcu_read_unlock(); 1909 } 1910 1911 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1912 { 1913 struct xfrm_mgr *km; 1914 rcu_read_lock(); 1915 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1916 if (km->notify) 1917 km->notify(x, c); 1918 rcu_read_unlock(); 1919 } 1920 1921 EXPORT_SYMBOL(km_policy_notify); 1922 EXPORT_SYMBOL(km_state_notify); 1923 1924 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1925 { 1926 struct km_event c; 1927 1928 c.data.hard = hard; 1929 c.portid = portid; 1930 c.event = XFRM_MSG_EXPIRE; 1931 km_state_notify(x, &c); 1932 } 1933 1934 EXPORT_SYMBOL(km_state_expired); 1935 /* 1936 * We send to all registered managers regardless of failure 1937 * We are happy with one success 1938 */ 1939 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1940 { 1941 int err = -EINVAL, acqret; 1942 struct xfrm_mgr *km; 1943 1944 rcu_read_lock(); 1945 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1946 acqret = km->acquire(x, t, pol); 1947 if (!acqret) 1948 err = acqret; 1949 } 1950 rcu_read_unlock(); 1951 return err; 1952 } 1953 EXPORT_SYMBOL(km_query); 1954 1955 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1956 { 1957 int err = -EINVAL; 1958 struct xfrm_mgr *km; 1959 1960 rcu_read_lock(); 1961 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1962 if (km->new_mapping) 1963 err = km->new_mapping(x, ipaddr, sport); 1964 if (!err) 1965 break; 1966 } 1967 rcu_read_unlock(); 1968 return err; 1969 } 1970 EXPORT_SYMBOL(km_new_mapping); 1971 1972 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1973 { 1974 struct km_event c; 1975 1976 c.data.hard = hard; 1977 c.portid = portid; 1978 c.event = XFRM_MSG_POLEXPIRE; 1979 km_policy_notify(pol, dir, &c); 1980 } 1981 EXPORT_SYMBOL(km_policy_expired); 1982 1983 #ifdef CONFIG_XFRM_MIGRATE 1984 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1985 const struct xfrm_migrate *m, int num_migrate, 1986 const struct xfrm_kmaddress *k, 1987 const struct xfrm_encap_tmpl *encap) 1988 { 1989 int err = -EINVAL; 1990 int ret; 1991 struct xfrm_mgr *km; 1992 1993 rcu_read_lock(); 1994 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1995 if (km->migrate) { 1996 ret = km->migrate(sel, dir, type, m, num_migrate, k, 1997 encap); 1998 if (!ret) 1999 err = ret; 2000 } 2001 } 2002 rcu_read_unlock(); 2003 return err; 2004 } 2005 EXPORT_SYMBOL(km_migrate); 2006 #endif 2007 2008 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2009 { 2010 int err = -EINVAL; 2011 int ret; 2012 struct xfrm_mgr *km; 2013 2014 rcu_read_lock(); 2015 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2016 if (km->report) { 2017 ret = km->report(net, proto, sel, addr); 2018 if (!ret) 2019 err = ret; 2020 } 2021 } 2022 rcu_read_unlock(); 2023 return err; 2024 } 2025 EXPORT_SYMBOL(km_report); 2026 2027 bool km_is_alive(const struct km_event *c) 2028 { 2029 struct xfrm_mgr *km; 2030 bool is_alive = false; 2031 2032 rcu_read_lock(); 2033 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2034 if (km->is_alive && km->is_alive(c)) { 2035 is_alive = true; 2036 break; 2037 } 2038 } 2039 rcu_read_unlock(); 2040 2041 return is_alive; 2042 } 2043 EXPORT_SYMBOL(km_is_alive); 2044 2045 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 2046 { 2047 int err; 2048 u8 *data; 2049 struct xfrm_mgr *km; 2050 struct xfrm_policy *pol = NULL; 2051 2052 if (optlen <= 0 || optlen > PAGE_SIZE) 2053 return -EMSGSIZE; 2054 2055 data = memdup_user(optval, optlen); 2056 if (IS_ERR(data)) 2057 return PTR_ERR(data); 2058 2059 err = -EINVAL; 2060 rcu_read_lock(); 2061 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2062 pol = km->compile_policy(sk, optname, data, 2063 optlen, &err); 2064 if (err >= 0) 2065 break; 2066 } 2067 rcu_read_unlock(); 2068 2069 if (err >= 0) { 2070 xfrm_sk_policy_insert(sk, err, pol); 2071 xfrm_pol_put(pol); 2072 err = 0; 2073 } 2074 2075 kfree(data); 2076 return err; 2077 } 2078 EXPORT_SYMBOL(xfrm_user_policy); 2079 2080 static DEFINE_SPINLOCK(xfrm_km_lock); 2081 2082 int xfrm_register_km(struct xfrm_mgr *km) 2083 { 2084 spin_lock_bh(&xfrm_km_lock); 2085 list_add_tail_rcu(&km->list, &xfrm_km_list); 2086 spin_unlock_bh(&xfrm_km_lock); 2087 return 0; 2088 } 2089 EXPORT_SYMBOL(xfrm_register_km); 2090 2091 int xfrm_unregister_km(struct xfrm_mgr *km) 2092 { 2093 spin_lock_bh(&xfrm_km_lock); 2094 list_del_rcu(&km->list); 2095 spin_unlock_bh(&xfrm_km_lock); 2096 synchronize_rcu(); 2097 return 0; 2098 } 2099 EXPORT_SYMBOL(xfrm_unregister_km); 2100 2101 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 2102 { 2103 int err = 0; 2104 2105 if (WARN_ON(afinfo->family >= NPROTO)) 2106 return -EAFNOSUPPORT; 2107 2108 spin_lock_bh(&xfrm_state_afinfo_lock); 2109 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 2110 err = -EEXIST; 2111 else 2112 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 2113 spin_unlock_bh(&xfrm_state_afinfo_lock); 2114 return err; 2115 } 2116 EXPORT_SYMBOL(xfrm_state_register_afinfo); 2117 2118 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 2119 { 2120 int err = 0, family = afinfo->family; 2121 2122 if (WARN_ON(family >= NPROTO)) 2123 return -EAFNOSUPPORT; 2124 2125 spin_lock_bh(&xfrm_state_afinfo_lock); 2126 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 2127 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 2128 err = -EINVAL; 2129 else 2130 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 2131 } 2132 spin_unlock_bh(&xfrm_state_afinfo_lock); 2133 synchronize_rcu(); 2134 return err; 2135 } 2136 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 2137 2138 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 2139 { 2140 if (unlikely(family >= NPROTO)) 2141 return NULL; 2142 2143 return rcu_dereference(xfrm_state_afinfo[family]); 2144 } 2145 2146 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 2147 { 2148 struct xfrm_state_afinfo *afinfo; 2149 if (unlikely(family >= NPROTO)) 2150 return NULL; 2151 rcu_read_lock(); 2152 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 2153 if (unlikely(!afinfo)) 2154 rcu_read_unlock(); 2155 return afinfo; 2156 } 2157 2158 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 2159 void xfrm_state_delete_tunnel(struct xfrm_state *x) 2160 { 2161 if (x->tunnel) { 2162 struct xfrm_state *t = x->tunnel; 2163 2164 if (atomic_read(&t->tunnel_users) == 2) 2165 xfrm_state_delete(t); 2166 atomic_dec(&t->tunnel_users); 2167 xfrm_state_put(t); 2168 x->tunnel = NULL; 2169 } 2170 } 2171 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 2172 2173 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 2174 { 2175 const struct xfrm_type *type = READ_ONCE(x->type); 2176 2177 if (x->km.state == XFRM_STATE_VALID && 2178 type && type->get_mtu) 2179 return type->get_mtu(x, mtu); 2180 2181 return mtu - x->props.header_len; 2182 } 2183 2184 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) 2185 { 2186 struct xfrm_state_afinfo *afinfo; 2187 struct xfrm_mode *inner_mode; 2188 int family = x->props.family; 2189 int err; 2190 2191 err = -EAFNOSUPPORT; 2192 afinfo = xfrm_state_get_afinfo(family); 2193 if (!afinfo) 2194 goto error; 2195 2196 err = 0; 2197 if (afinfo->init_flags) 2198 err = afinfo->init_flags(x); 2199 2200 rcu_read_unlock(); 2201 2202 if (err) 2203 goto error; 2204 2205 err = -EPROTONOSUPPORT; 2206 2207 if (x->sel.family != AF_UNSPEC) { 2208 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 2209 if (inner_mode == NULL) 2210 goto error; 2211 2212 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 2213 family != x->sel.family) { 2214 xfrm_put_mode(inner_mode); 2215 goto error; 2216 } 2217 2218 x->inner_mode = inner_mode; 2219 } else { 2220 struct xfrm_mode *inner_mode_iaf; 2221 int iafamily = AF_INET; 2222 2223 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 2224 if (inner_mode == NULL) 2225 goto error; 2226 2227 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 2228 xfrm_put_mode(inner_mode); 2229 goto error; 2230 } 2231 x->inner_mode = inner_mode; 2232 2233 if (x->props.family == AF_INET) 2234 iafamily = AF_INET6; 2235 2236 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2237 if (inner_mode_iaf) { 2238 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2239 x->inner_mode_iaf = inner_mode_iaf; 2240 else 2241 xfrm_put_mode(inner_mode_iaf); 2242 } 2243 } 2244 2245 x->type = xfrm_get_type(x->id.proto, family); 2246 if (x->type == NULL) 2247 goto error; 2248 2249 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); 2250 2251 err = x->type->init_state(x); 2252 if (err) 2253 goto error; 2254 2255 x->outer_mode = xfrm_get_mode(x->props.mode, family); 2256 if (x->outer_mode == NULL) { 2257 err = -EPROTONOSUPPORT; 2258 goto error; 2259 } 2260 2261 if (init_replay) { 2262 err = xfrm_init_replay(x); 2263 if (err) 2264 goto error; 2265 } 2266 2267 x->km.state = XFRM_STATE_VALID; 2268 2269 error: 2270 return err; 2271 } 2272 2273 EXPORT_SYMBOL(__xfrm_init_state); 2274 2275 int xfrm_init_state(struct xfrm_state *x) 2276 { 2277 return __xfrm_init_state(x, true, false); 2278 } 2279 2280 EXPORT_SYMBOL(xfrm_init_state); 2281 2282 int __net_init xfrm_state_init(struct net *net) 2283 { 2284 unsigned int sz; 2285 2286 INIT_LIST_HEAD(&net->xfrm.state_all); 2287 2288 sz = sizeof(struct hlist_head) * 8; 2289 2290 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2291 if (!net->xfrm.state_bydst) 2292 goto out_bydst; 2293 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2294 if (!net->xfrm.state_bysrc) 2295 goto out_bysrc; 2296 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2297 if (!net->xfrm.state_byspi) 2298 goto out_byspi; 2299 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2300 2301 net->xfrm.state_num = 0; 2302 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2303 spin_lock_init(&net->xfrm.xfrm_state_lock); 2304 return 0; 2305 2306 out_byspi: 2307 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2308 out_bysrc: 2309 xfrm_hash_free(net->xfrm.state_bydst, sz); 2310 out_bydst: 2311 return -ENOMEM; 2312 } 2313 2314 void xfrm_state_fini(struct net *net) 2315 { 2316 unsigned int sz; 2317 2318 flush_work(&net->xfrm.state_hash_work); 2319 xfrm_state_flush(net, IPSEC_PROTO_ANY, false); 2320 flush_work(&xfrm_state_gc_work); 2321 2322 WARN_ON(!list_empty(&net->xfrm.state_all)); 2323 2324 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2325 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2326 xfrm_hash_free(net->xfrm.state_byspi, sz); 2327 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2328 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2329 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2330 xfrm_hash_free(net->xfrm.state_bydst, sz); 2331 } 2332 2333 #ifdef CONFIG_AUDITSYSCALL 2334 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2335 struct audit_buffer *audit_buf) 2336 { 2337 struct xfrm_sec_ctx *ctx = x->security; 2338 u32 spi = ntohl(x->id.spi); 2339 2340 if (ctx) 2341 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2342 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2343 2344 switch (x->props.family) { 2345 case AF_INET: 2346 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2347 &x->props.saddr.a4, &x->id.daddr.a4); 2348 break; 2349 case AF_INET6: 2350 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2351 x->props.saddr.a6, x->id.daddr.a6); 2352 break; 2353 } 2354 2355 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2356 } 2357 2358 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2359 struct audit_buffer *audit_buf) 2360 { 2361 const struct iphdr *iph4; 2362 const struct ipv6hdr *iph6; 2363 2364 switch (family) { 2365 case AF_INET: 2366 iph4 = ip_hdr(skb); 2367 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2368 &iph4->saddr, &iph4->daddr); 2369 break; 2370 case AF_INET6: 2371 iph6 = ipv6_hdr(skb); 2372 audit_log_format(audit_buf, 2373 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2374 &iph6->saddr, &iph6->daddr, 2375 iph6->flow_lbl[0] & 0x0f, 2376 iph6->flow_lbl[1], 2377 iph6->flow_lbl[2]); 2378 break; 2379 } 2380 } 2381 2382 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 2383 { 2384 struct audit_buffer *audit_buf; 2385 2386 audit_buf = xfrm_audit_start("SAD-add"); 2387 if (audit_buf == NULL) 2388 return; 2389 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2390 xfrm_audit_helper_sainfo(x, audit_buf); 2391 audit_log_format(audit_buf, " res=%u", result); 2392 audit_log_end(audit_buf); 2393 } 2394 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2395 2396 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 2397 { 2398 struct audit_buffer *audit_buf; 2399 2400 audit_buf = xfrm_audit_start("SAD-delete"); 2401 if (audit_buf == NULL) 2402 return; 2403 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2404 xfrm_audit_helper_sainfo(x, audit_buf); 2405 audit_log_format(audit_buf, " res=%u", result); 2406 audit_log_end(audit_buf); 2407 } 2408 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2409 2410 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2411 struct sk_buff *skb) 2412 { 2413 struct audit_buffer *audit_buf; 2414 u32 spi; 2415 2416 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2417 if (audit_buf == NULL) 2418 return; 2419 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2420 /* don't record the sequence number because it's inherent in this kind 2421 * of audit message */ 2422 spi = ntohl(x->id.spi); 2423 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2424 audit_log_end(audit_buf); 2425 } 2426 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2427 2428 void xfrm_audit_state_replay(struct xfrm_state *x, 2429 struct sk_buff *skb, __be32 net_seq) 2430 { 2431 struct audit_buffer *audit_buf; 2432 u32 spi; 2433 2434 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2435 if (audit_buf == NULL) 2436 return; 2437 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2438 spi = ntohl(x->id.spi); 2439 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2440 spi, spi, ntohl(net_seq)); 2441 audit_log_end(audit_buf); 2442 } 2443 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2444 2445 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2446 { 2447 struct audit_buffer *audit_buf; 2448 2449 audit_buf = xfrm_audit_start("SA-notfound"); 2450 if (audit_buf == NULL) 2451 return; 2452 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2453 audit_log_end(audit_buf); 2454 } 2455 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2456 2457 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2458 __be32 net_spi, __be32 net_seq) 2459 { 2460 struct audit_buffer *audit_buf; 2461 u32 spi; 2462 2463 audit_buf = xfrm_audit_start("SA-notfound"); 2464 if (audit_buf == NULL) 2465 return; 2466 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2467 spi = ntohl(net_spi); 2468 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2469 spi, spi, ntohl(net_seq)); 2470 audit_log_end(audit_buf); 2471 } 2472 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2473 2474 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2475 struct sk_buff *skb, u8 proto) 2476 { 2477 struct audit_buffer *audit_buf; 2478 __be32 net_spi; 2479 __be32 net_seq; 2480 2481 audit_buf = xfrm_audit_start("SA-icv-failure"); 2482 if (audit_buf == NULL) 2483 return; 2484 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2485 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2486 u32 spi = ntohl(net_spi); 2487 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2488 spi, spi, ntohl(net_seq)); 2489 } 2490 audit_log_end(audit_buf); 2491 } 2492 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2493 #endif /* CONFIG_AUDITSYSCALL */ 2494