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 rcu_read_unlock(); 317 318 if (!type && try_load) { 319 request_module("xfrm-offload-%d-%d", family, proto); 320 try_load = false; 321 goto retry; 322 } 323 324 return type; 325 } 326 327 static void xfrm_put_type_offload(const struct xfrm_type_offload *type) 328 { 329 module_put(type->owner); 330 } 331 332 static DEFINE_SPINLOCK(xfrm_mode_lock); 333 int xfrm_register_mode(struct xfrm_mode *mode, int family) 334 { 335 struct xfrm_state_afinfo *afinfo; 336 struct xfrm_mode **modemap; 337 int err; 338 339 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 340 return -EINVAL; 341 342 afinfo = xfrm_state_get_afinfo(family); 343 if (unlikely(afinfo == NULL)) 344 return -EAFNOSUPPORT; 345 346 err = -EEXIST; 347 modemap = afinfo->mode_map; 348 spin_lock_bh(&xfrm_mode_lock); 349 if (modemap[mode->encap]) 350 goto out; 351 352 err = -ENOENT; 353 if (!try_module_get(afinfo->owner)) 354 goto out; 355 356 mode->afinfo = afinfo; 357 modemap[mode->encap] = mode; 358 err = 0; 359 360 out: 361 spin_unlock_bh(&xfrm_mode_lock); 362 rcu_read_unlock(); 363 return err; 364 } 365 EXPORT_SYMBOL(xfrm_register_mode); 366 367 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 368 { 369 struct xfrm_state_afinfo *afinfo; 370 struct xfrm_mode **modemap; 371 int err; 372 373 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 374 return -EINVAL; 375 376 afinfo = xfrm_state_get_afinfo(family); 377 if (unlikely(afinfo == NULL)) 378 return -EAFNOSUPPORT; 379 380 err = -ENOENT; 381 modemap = afinfo->mode_map; 382 spin_lock_bh(&xfrm_mode_lock); 383 if (likely(modemap[mode->encap] == mode)) { 384 modemap[mode->encap] = NULL; 385 module_put(mode->afinfo->owner); 386 err = 0; 387 } 388 389 spin_unlock_bh(&xfrm_mode_lock); 390 rcu_read_unlock(); 391 return err; 392 } 393 EXPORT_SYMBOL(xfrm_unregister_mode); 394 395 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 396 { 397 struct xfrm_state_afinfo *afinfo; 398 struct xfrm_mode *mode; 399 int modload_attempted = 0; 400 401 if (unlikely(encap >= XFRM_MODE_MAX)) 402 return NULL; 403 404 retry: 405 afinfo = xfrm_state_get_afinfo(family); 406 if (unlikely(afinfo == NULL)) 407 return NULL; 408 409 mode = READ_ONCE(afinfo->mode_map[encap]); 410 if (unlikely(mode && !try_module_get(mode->owner))) 411 mode = NULL; 412 413 rcu_read_unlock(); 414 if (!mode && !modload_attempted) { 415 request_module("xfrm-mode-%d-%d", family, encap); 416 modload_attempted = 1; 417 goto retry; 418 } 419 420 return mode; 421 } 422 423 static void xfrm_put_mode(struct xfrm_mode *mode) 424 { 425 module_put(mode->owner); 426 } 427 428 static void xfrm_state_gc_destroy(struct xfrm_state *x) 429 { 430 tasklet_hrtimer_cancel(&x->mtimer); 431 del_timer_sync(&x->rtimer); 432 kfree(x->aead); 433 kfree(x->aalg); 434 kfree(x->ealg); 435 kfree(x->calg); 436 kfree(x->encap); 437 kfree(x->coaddr); 438 kfree(x->replay_esn); 439 kfree(x->preplay_esn); 440 if (x->inner_mode) 441 xfrm_put_mode(x->inner_mode); 442 if (x->inner_mode_iaf) 443 xfrm_put_mode(x->inner_mode_iaf); 444 if (x->outer_mode) 445 xfrm_put_mode(x->outer_mode); 446 if (x->type_offload) 447 xfrm_put_type_offload(x->type_offload); 448 if (x->type) { 449 x->type->destructor(x); 450 xfrm_put_type(x->type); 451 } 452 xfrm_dev_state_free(x); 453 security_xfrm_state_free(x); 454 kfree(x); 455 } 456 457 static void xfrm_state_gc_task(struct work_struct *work) 458 { 459 struct xfrm_state *x; 460 struct hlist_node *tmp; 461 struct hlist_head gc_list; 462 463 spin_lock_bh(&xfrm_state_gc_lock); 464 hlist_move_list(&xfrm_state_gc_list, &gc_list); 465 spin_unlock_bh(&xfrm_state_gc_lock); 466 467 synchronize_rcu(); 468 469 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 470 xfrm_state_gc_destroy(x); 471 } 472 473 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 474 { 475 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 476 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 477 unsigned long now = get_seconds(); 478 long next = LONG_MAX; 479 int warn = 0; 480 int err = 0; 481 482 spin_lock(&x->lock); 483 if (x->km.state == XFRM_STATE_DEAD) 484 goto out; 485 if (x->km.state == XFRM_STATE_EXPIRED) 486 goto expired; 487 if (x->lft.hard_add_expires_seconds) { 488 long tmo = x->lft.hard_add_expires_seconds + 489 x->curlft.add_time - now; 490 if (tmo <= 0) { 491 if (x->xflags & XFRM_SOFT_EXPIRE) { 492 /* enter hard expire without soft expire first?! 493 * setting a new date could trigger this. 494 * workaround: fix x->curflt.add_time by below: 495 */ 496 x->curlft.add_time = now - x->saved_tmo - 1; 497 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 498 } else 499 goto expired; 500 } 501 if (tmo < next) 502 next = tmo; 503 } 504 if (x->lft.hard_use_expires_seconds) { 505 long tmo = x->lft.hard_use_expires_seconds + 506 (x->curlft.use_time ? : now) - now; 507 if (tmo <= 0) 508 goto expired; 509 if (tmo < next) 510 next = tmo; 511 } 512 if (x->km.dying) 513 goto resched; 514 if (x->lft.soft_add_expires_seconds) { 515 long tmo = x->lft.soft_add_expires_seconds + 516 x->curlft.add_time - now; 517 if (tmo <= 0) { 518 warn = 1; 519 x->xflags &= ~XFRM_SOFT_EXPIRE; 520 } else if (tmo < next) { 521 next = tmo; 522 x->xflags |= XFRM_SOFT_EXPIRE; 523 x->saved_tmo = tmo; 524 } 525 } 526 if (x->lft.soft_use_expires_seconds) { 527 long tmo = x->lft.soft_use_expires_seconds + 528 (x->curlft.use_time ? : now) - now; 529 if (tmo <= 0) 530 warn = 1; 531 else if (tmo < next) 532 next = tmo; 533 } 534 535 x->km.dying = warn; 536 if (warn) 537 km_state_expired(x, 0, 0); 538 resched: 539 if (next != LONG_MAX) { 540 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 541 } 542 543 goto out; 544 545 expired: 546 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 547 x->km.state = XFRM_STATE_EXPIRED; 548 549 err = __xfrm_state_delete(x); 550 if (!err) 551 km_state_expired(x, 1, 0); 552 553 xfrm_audit_state_delete(x, err ? 0 : 1, true); 554 555 out: 556 spin_unlock(&x->lock); 557 return HRTIMER_NORESTART; 558 } 559 560 static void xfrm_replay_timer_handler(struct timer_list *t); 561 562 struct xfrm_state *xfrm_state_alloc(struct net *net) 563 { 564 struct xfrm_state *x; 565 566 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 567 568 if (x) { 569 write_pnet(&x->xs_net, net); 570 refcount_set(&x->refcnt, 1); 571 atomic_set(&x->tunnel_users, 0); 572 INIT_LIST_HEAD(&x->km.all); 573 INIT_HLIST_NODE(&x->bydst); 574 INIT_HLIST_NODE(&x->bysrc); 575 INIT_HLIST_NODE(&x->byspi); 576 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, 577 CLOCK_BOOTTIME, HRTIMER_MODE_ABS); 578 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 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 out: 736 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 737 if (cnt) { 738 err = 0; 739 xfrm_policy_cache_flush(); 740 } 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 x->geniv = orig->geniv; 1348 if (!x->aead) 1349 goto error; 1350 } 1351 if (orig->ealg) { 1352 x->ealg = xfrm_algo_clone(orig->ealg); 1353 if (!x->ealg) 1354 goto error; 1355 } 1356 x->props.ealgo = orig->props.ealgo; 1357 1358 if (orig->calg) { 1359 x->calg = xfrm_algo_clone(orig->calg); 1360 if (!x->calg) 1361 goto error; 1362 } 1363 x->props.calgo = orig->props.calgo; 1364 1365 if (encap || orig->encap) { 1366 if (encap) 1367 x->encap = kmemdup(encap, sizeof(*x->encap), 1368 GFP_KERNEL); 1369 else 1370 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1371 GFP_KERNEL); 1372 1373 if (!x->encap) 1374 goto error; 1375 } 1376 1377 if (orig->coaddr) { 1378 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1379 GFP_KERNEL); 1380 if (!x->coaddr) 1381 goto error; 1382 } 1383 1384 if (orig->replay_esn) { 1385 if (xfrm_replay_clone(x, orig)) 1386 goto error; 1387 } 1388 1389 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1390 1391 if (xfrm_init_state(x) < 0) 1392 goto error; 1393 1394 x->props.flags = orig->props.flags; 1395 x->props.extra_flags = orig->props.extra_flags; 1396 1397 x->tfcpad = orig->tfcpad; 1398 x->replay_maxdiff = orig->replay_maxdiff; 1399 x->replay_maxage = orig->replay_maxage; 1400 x->curlft.add_time = orig->curlft.add_time; 1401 x->km.state = orig->km.state; 1402 x->km.seq = orig->km.seq; 1403 x->replay = orig->replay; 1404 x->preplay = orig->preplay; 1405 1406 return x; 1407 1408 error: 1409 xfrm_state_put(x); 1410 out: 1411 return NULL; 1412 } 1413 1414 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1415 { 1416 unsigned int h; 1417 struct xfrm_state *x = NULL; 1418 1419 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1420 1421 if (m->reqid) { 1422 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1423 m->reqid, m->old_family); 1424 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1425 if (x->props.mode != m->mode || 1426 x->id.proto != m->proto) 1427 continue; 1428 if (m->reqid && x->props.reqid != m->reqid) 1429 continue; 1430 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1431 m->old_family) || 1432 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1433 m->old_family)) 1434 continue; 1435 xfrm_state_hold(x); 1436 break; 1437 } 1438 } else { 1439 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1440 m->old_family); 1441 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1442 if (x->props.mode != m->mode || 1443 x->id.proto != m->proto) 1444 continue; 1445 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1446 m->old_family) || 1447 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1448 m->old_family)) 1449 continue; 1450 xfrm_state_hold(x); 1451 break; 1452 } 1453 } 1454 1455 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1456 1457 return x; 1458 } 1459 EXPORT_SYMBOL(xfrm_migrate_state_find); 1460 1461 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1462 struct xfrm_migrate *m, 1463 struct xfrm_encap_tmpl *encap) 1464 { 1465 struct xfrm_state *xc; 1466 1467 xc = xfrm_state_clone(x, encap); 1468 if (!xc) 1469 return NULL; 1470 1471 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1472 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1473 1474 /* add state */ 1475 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1476 /* a care is needed when the destination address of the 1477 state is to be updated as it is a part of triplet */ 1478 xfrm_state_insert(xc); 1479 } else { 1480 if (xfrm_state_add(xc) < 0) 1481 goto error; 1482 } 1483 1484 return xc; 1485 error: 1486 xfrm_state_put(xc); 1487 return NULL; 1488 } 1489 EXPORT_SYMBOL(xfrm_state_migrate); 1490 #endif 1491 1492 int xfrm_state_update(struct xfrm_state *x) 1493 { 1494 struct xfrm_state *x1, *to_put; 1495 int err; 1496 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1497 struct net *net = xs_net(x); 1498 1499 to_put = NULL; 1500 1501 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1502 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1503 1504 err = -ESRCH; 1505 if (!x1) 1506 goto out; 1507 1508 if (xfrm_state_kern(x1)) { 1509 to_put = x1; 1510 err = -EEXIST; 1511 goto out; 1512 } 1513 1514 if (x1->km.state == XFRM_STATE_ACQ) { 1515 __xfrm_state_insert(x); 1516 x = NULL; 1517 } 1518 err = 0; 1519 1520 out: 1521 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1522 1523 if (to_put) 1524 xfrm_state_put(to_put); 1525 1526 if (err) 1527 return err; 1528 1529 if (!x) { 1530 xfrm_state_delete(x1); 1531 xfrm_state_put(x1); 1532 return 0; 1533 } 1534 1535 err = -EINVAL; 1536 spin_lock_bh(&x1->lock); 1537 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1538 if (x->encap && x1->encap && 1539 x->encap->encap_type == x1->encap->encap_type) 1540 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1541 else if (x->encap || x1->encap) 1542 goto fail; 1543 1544 if (x->coaddr && x1->coaddr) { 1545 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1546 } 1547 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1548 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1549 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1550 x1->km.dying = 0; 1551 1552 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1553 if (x1->curlft.use_time) 1554 xfrm_state_check_expire(x1); 1555 1556 err = 0; 1557 x->km.state = XFRM_STATE_DEAD; 1558 __xfrm_state_put(x); 1559 } 1560 1561 fail: 1562 spin_unlock_bh(&x1->lock); 1563 1564 xfrm_state_put(x1); 1565 1566 return err; 1567 } 1568 EXPORT_SYMBOL(xfrm_state_update); 1569 1570 int xfrm_state_check_expire(struct xfrm_state *x) 1571 { 1572 if (!x->curlft.use_time) 1573 x->curlft.use_time = get_seconds(); 1574 1575 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1576 x->curlft.packets >= x->lft.hard_packet_limit) { 1577 x->km.state = XFRM_STATE_EXPIRED; 1578 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL); 1579 return -EINVAL; 1580 } 1581 1582 if (!x->km.dying && 1583 (x->curlft.bytes >= x->lft.soft_byte_limit || 1584 x->curlft.packets >= x->lft.soft_packet_limit)) { 1585 x->km.dying = 1; 1586 km_state_expired(x, 0, 0); 1587 } 1588 return 0; 1589 } 1590 EXPORT_SYMBOL(xfrm_state_check_expire); 1591 1592 struct xfrm_state * 1593 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1594 u8 proto, unsigned short family) 1595 { 1596 struct xfrm_state *x; 1597 1598 rcu_read_lock(); 1599 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1600 rcu_read_unlock(); 1601 return x; 1602 } 1603 EXPORT_SYMBOL(xfrm_state_lookup); 1604 1605 struct xfrm_state * 1606 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1607 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1608 u8 proto, unsigned short family) 1609 { 1610 struct xfrm_state *x; 1611 1612 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1613 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1614 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1615 return x; 1616 } 1617 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1618 1619 struct xfrm_state * 1620 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1621 u8 proto, const xfrm_address_t *daddr, 1622 const xfrm_address_t *saddr, int create, unsigned short family) 1623 { 1624 struct xfrm_state *x; 1625 1626 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1627 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1628 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1629 1630 return x; 1631 } 1632 EXPORT_SYMBOL(xfrm_find_acq); 1633 1634 #ifdef CONFIG_XFRM_SUB_POLICY 1635 int 1636 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1637 unsigned short family, struct net *net) 1638 { 1639 int i; 1640 int err = 0; 1641 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1642 if (!afinfo) 1643 return -EAFNOSUPPORT; 1644 1645 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ 1646 if (afinfo->tmpl_sort) 1647 err = afinfo->tmpl_sort(dst, src, n); 1648 else 1649 for (i = 0; i < n; i++) 1650 dst[i] = src[i]; 1651 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1652 rcu_read_unlock(); 1653 return err; 1654 } 1655 EXPORT_SYMBOL(xfrm_tmpl_sort); 1656 1657 int 1658 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1659 unsigned short family) 1660 { 1661 int i; 1662 int err = 0; 1663 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1664 struct net *net = xs_net(*src); 1665 1666 if (!afinfo) 1667 return -EAFNOSUPPORT; 1668 1669 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1670 if (afinfo->state_sort) 1671 err = afinfo->state_sort(dst, src, n); 1672 else 1673 for (i = 0; i < n; i++) 1674 dst[i] = src[i]; 1675 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1676 rcu_read_unlock(); 1677 return err; 1678 } 1679 EXPORT_SYMBOL(xfrm_state_sort); 1680 #endif 1681 1682 /* Silly enough, but I'm lazy to build resolution list */ 1683 1684 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1685 { 1686 int i; 1687 1688 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1689 struct xfrm_state *x; 1690 1691 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1692 if (x->km.seq == seq && 1693 (mark & x->mark.m) == x->mark.v && 1694 x->km.state == XFRM_STATE_ACQ) { 1695 xfrm_state_hold(x); 1696 return x; 1697 } 1698 } 1699 } 1700 return NULL; 1701 } 1702 1703 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1704 { 1705 struct xfrm_state *x; 1706 1707 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1708 x = __xfrm_find_acq_byseq(net, mark, seq); 1709 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1710 return x; 1711 } 1712 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1713 1714 u32 xfrm_get_acqseq(void) 1715 { 1716 u32 res; 1717 static atomic_t acqseq; 1718 1719 do { 1720 res = atomic_inc_return(&acqseq); 1721 } while (!res); 1722 1723 return res; 1724 } 1725 EXPORT_SYMBOL(xfrm_get_acqseq); 1726 1727 int verify_spi_info(u8 proto, u32 min, u32 max) 1728 { 1729 switch (proto) { 1730 case IPPROTO_AH: 1731 case IPPROTO_ESP: 1732 break; 1733 1734 case IPPROTO_COMP: 1735 /* IPCOMP spi is 16-bits. */ 1736 if (max >= 0x10000) 1737 return -EINVAL; 1738 break; 1739 1740 default: 1741 return -EINVAL; 1742 } 1743 1744 if (min > max) 1745 return -EINVAL; 1746 1747 return 0; 1748 } 1749 EXPORT_SYMBOL(verify_spi_info); 1750 1751 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1752 { 1753 struct net *net = xs_net(x); 1754 unsigned int h; 1755 struct xfrm_state *x0; 1756 int err = -ENOENT; 1757 __be32 minspi = htonl(low); 1758 __be32 maxspi = htonl(high); 1759 u32 mark = x->mark.v & x->mark.m; 1760 1761 spin_lock_bh(&x->lock); 1762 if (x->km.state == XFRM_STATE_DEAD) 1763 goto unlock; 1764 1765 err = 0; 1766 if (x->id.spi) 1767 goto unlock; 1768 1769 err = -ENOENT; 1770 1771 if (minspi == maxspi) { 1772 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1773 if (x0) { 1774 xfrm_state_put(x0); 1775 goto unlock; 1776 } 1777 x->id.spi = minspi; 1778 } else { 1779 u32 spi = 0; 1780 for (h = 0; h < high-low+1; h++) { 1781 spi = low + prandom_u32()%(high-low+1); 1782 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1783 if (x0 == NULL) { 1784 x->id.spi = htonl(spi); 1785 break; 1786 } 1787 xfrm_state_put(x0); 1788 } 1789 } 1790 if (x->id.spi) { 1791 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1792 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1793 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1794 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1795 1796 err = 0; 1797 } 1798 1799 unlock: 1800 spin_unlock_bh(&x->lock); 1801 1802 return err; 1803 } 1804 EXPORT_SYMBOL(xfrm_alloc_spi); 1805 1806 static bool __xfrm_state_filter_match(struct xfrm_state *x, 1807 struct xfrm_address_filter *filter) 1808 { 1809 if (filter) { 1810 if ((filter->family == AF_INET || 1811 filter->family == AF_INET6) && 1812 x->props.family != filter->family) 1813 return false; 1814 1815 return addr_match(&x->props.saddr, &filter->saddr, 1816 filter->splen) && 1817 addr_match(&x->id.daddr, &filter->daddr, 1818 filter->dplen); 1819 } 1820 return true; 1821 } 1822 1823 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1824 int (*func)(struct xfrm_state *, int, void*), 1825 void *data) 1826 { 1827 struct xfrm_state *state; 1828 struct xfrm_state_walk *x; 1829 int err = 0; 1830 1831 if (walk->seq != 0 && list_empty(&walk->all)) 1832 return 0; 1833 1834 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1835 if (list_empty(&walk->all)) 1836 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1837 else 1838 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 1839 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1840 if (x->state == XFRM_STATE_DEAD) 1841 continue; 1842 state = container_of(x, struct xfrm_state, km); 1843 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1844 continue; 1845 if (!__xfrm_state_filter_match(state, walk->filter)) 1846 continue; 1847 err = func(state, walk->seq, data); 1848 if (err) { 1849 list_move_tail(&walk->all, &x->all); 1850 goto out; 1851 } 1852 walk->seq++; 1853 } 1854 if (walk->seq == 0) { 1855 err = -ENOENT; 1856 goto out; 1857 } 1858 list_del_init(&walk->all); 1859 out: 1860 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1861 return err; 1862 } 1863 EXPORT_SYMBOL(xfrm_state_walk); 1864 1865 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1866 struct xfrm_address_filter *filter) 1867 { 1868 INIT_LIST_HEAD(&walk->all); 1869 walk->proto = proto; 1870 walk->state = XFRM_STATE_DEAD; 1871 walk->seq = 0; 1872 walk->filter = filter; 1873 } 1874 EXPORT_SYMBOL(xfrm_state_walk_init); 1875 1876 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 1877 { 1878 kfree(walk->filter); 1879 1880 if (list_empty(&walk->all)) 1881 return; 1882 1883 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1884 list_del(&walk->all); 1885 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1886 } 1887 EXPORT_SYMBOL(xfrm_state_walk_done); 1888 1889 static void xfrm_replay_timer_handler(struct timer_list *t) 1890 { 1891 struct xfrm_state *x = from_timer(x, t, rtimer); 1892 1893 spin_lock(&x->lock); 1894 1895 if (x->km.state == XFRM_STATE_VALID) { 1896 if (xfrm_aevent_is_on(xs_net(x))) 1897 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1898 else 1899 x->xflags |= XFRM_TIME_DEFER; 1900 } 1901 1902 spin_unlock(&x->lock); 1903 } 1904 1905 static LIST_HEAD(xfrm_km_list); 1906 1907 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1908 { 1909 struct xfrm_mgr *km; 1910 1911 rcu_read_lock(); 1912 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1913 if (km->notify_policy) 1914 km->notify_policy(xp, dir, c); 1915 rcu_read_unlock(); 1916 } 1917 1918 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1919 { 1920 struct xfrm_mgr *km; 1921 rcu_read_lock(); 1922 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1923 if (km->notify) 1924 km->notify(x, c); 1925 rcu_read_unlock(); 1926 } 1927 1928 EXPORT_SYMBOL(km_policy_notify); 1929 EXPORT_SYMBOL(km_state_notify); 1930 1931 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1932 { 1933 struct km_event c; 1934 1935 c.data.hard = hard; 1936 c.portid = portid; 1937 c.event = XFRM_MSG_EXPIRE; 1938 km_state_notify(x, &c); 1939 } 1940 1941 EXPORT_SYMBOL(km_state_expired); 1942 /* 1943 * We send to all registered managers regardless of failure 1944 * We are happy with one success 1945 */ 1946 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1947 { 1948 int err = -EINVAL, acqret; 1949 struct xfrm_mgr *km; 1950 1951 rcu_read_lock(); 1952 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1953 acqret = km->acquire(x, t, pol); 1954 if (!acqret) 1955 err = acqret; 1956 } 1957 rcu_read_unlock(); 1958 return err; 1959 } 1960 EXPORT_SYMBOL(km_query); 1961 1962 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1963 { 1964 int err = -EINVAL; 1965 struct xfrm_mgr *km; 1966 1967 rcu_read_lock(); 1968 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1969 if (km->new_mapping) 1970 err = km->new_mapping(x, ipaddr, sport); 1971 if (!err) 1972 break; 1973 } 1974 rcu_read_unlock(); 1975 return err; 1976 } 1977 EXPORT_SYMBOL(km_new_mapping); 1978 1979 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1980 { 1981 struct km_event c; 1982 1983 c.data.hard = hard; 1984 c.portid = portid; 1985 c.event = XFRM_MSG_POLEXPIRE; 1986 km_policy_notify(pol, dir, &c); 1987 } 1988 EXPORT_SYMBOL(km_policy_expired); 1989 1990 #ifdef CONFIG_XFRM_MIGRATE 1991 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1992 const struct xfrm_migrate *m, int num_migrate, 1993 const struct xfrm_kmaddress *k, 1994 const struct xfrm_encap_tmpl *encap) 1995 { 1996 int err = -EINVAL; 1997 int ret; 1998 struct xfrm_mgr *km; 1999 2000 rcu_read_lock(); 2001 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2002 if (km->migrate) { 2003 ret = km->migrate(sel, dir, type, m, num_migrate, k, 2004 encap); 2005 if (!ret) 2006 err = ret; 2007 } 2008 } 2009 rcu_read_unlock(); 2010 return err; 2011 } 2012 EXPORT_SYMBOL(km_migrate); 2013 #endif 2014 2015 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2016 { 2017 int err = -EINVAL; 2018 int ret; 2019 struct xfrm_mgr *km; 2020 2021 rcu_read_lock(); 2022 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2023 if (km->report) { 2024 ret = km->report(net, proto, sel, addr); 2025 if (!ret) 2026 err = ret; 2027 } 2028 } 2029 rcu_read_unlock(); 2030 return err; 2031 } 2032 EXPORT_SYMBOL(km_report); 2033 2034 bool km_is_alive(const struct km_event *c) 2035 { 2036 struct xfrm_mgr *km; 2037 bool is_alive = false; 2038 2039 rcu_read_lock(); 2040 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2041 if (km->is_alive && km->is_alive(c)) { 2042 is_alive = true; 2043 break; 2044 } 2045 } 2046 rcu_read_unlock(); 2047 2048 return is_alive; 2049 } 2050 EXPORT_SYMBOL(km_is_alive); 2051 2052 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 2053 { 2054 int err; 2055 u8 *data; 2056 struct xfrm_mgr *km; 2057 struct xfrm_policy *pol = NULL; 2058 2059 #ifdef CONFIG_COMPAT 2060 if (in_compat_syscall()) 2061 return -EOPNOTSUPP; 2062 #endif 2063 2064 if (!optval && !optlen) { 2065 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); 2066 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); 2067 __sk_dst_reset(sk); 2068 return 0; 2069 } 2070 2071 if (optlen <= 0 || optlen > PAGE_SIZE) 2072 return -EMSGSIZE; 2073 2074 data = memdup_user(optval, optlen); 2075 if (IS_ERR(data)) 2076 return PTR_ERR(data); 2077 2078 err = -EINVAL; 2079 rcu_read_lock(); 2080 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2081 pol = km->compile_policy(sk, optname, data, 2082 optlen, &err); 2083 if (err >= 0) 2084 break; 2085 } 2086 rcu_read_unlock(); 2087 2088 if (err >= 0) { 2089 xfrm_sk_policy_insert(sk, err, pol); 2090 xfrm_pol_put(pol); 2091 __sk_dst_reset(sk); 2092 err = 0; 2093 } 2094 2095 kfree(data); 2096 return err; 2097 } 2098 EXPORT_SYMBOL(xfrm_user_policy); 2099 2100 static DEFINE_SPINLOCK(xfrm_km_lock); 2101 2102 int xfrm_register_km(struct xfrm_mgr *km) 2103 { 2104 spin_lock_bh(&xfrm_km_lock); 2105 list_add_tail_rcu(&km->list, &xfrm_km_list); 2106 spin_unlock_bh(&xfrm_km_lock); 2107 return 0; 2108 } 2109 EXPORT_SYMBOL(xfrm_register_km); 2110 2111 int xfrm_unregister_km(struct xfrm_mgr *km) 2112 { 2113 spin_lock_bh(&xfrm_km_lock); 2114 list_del_rcu(&km->list); 2115 spin_unlock_bh(&xfrm_km_lock); 2116 synchronize_rcu(); 2117 return 0; 2118 } 2119 EXPORT_SYMBOL(xfrm_unregister_km); 2120 2121 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 2122 { 2123 int err = 0; 2124 2125 if (WARN_ON(afinfo->family >= NPROTO)) 2126 return -EAFNOSUPPORT; 2127 2128 spin_lock_bh(&xfrm_state_afinfo_lock); 2129 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 2130 err = -EEXIST; 2131 else 2132 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 2133 spin_unlock_bh(&xfrm_state_afinfo_lock); 2134 return err; 2135 } 2136 EXPORT_SYMBOL(xfrm_state_register_afinfo); 2137 2138 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 2139 { 2140 int err = 0, family = afinfo->family; 2141 2142 if (WARN_ON(family >= NPROTO)) 2143 return -EAFNOSUPPORT; 2144 2145 spin_lock_bh(&xfrm_state_afinfo_lock); 2146 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 2147 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) 2148 err = -EINVAL; 2149 else 2150 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 2151 } 2152 spin_unlock_bh(&xfrm_state_afinfo_lock); 2153 synchronize_rcu(); 2154 return err; 2155 } 2156 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 2157 2158 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) 2159 { 2160 if (unlikely(family >= NPROTO)) 2161 return NULL; 2162 2163 return rcu_dereference(xfrm_state_afinfo[family]); 2164 } 2165 2166 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 2167 { 2168 struct xfrm_state_afinfo *afinfo; 2169 if (unlikely(family >= NPROTO)) 2170 return NULL; 2171 rcu_read_lock(); 2172 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 2173 if (unlikely(!afinfo)) 2174 rcu_read_unlock(); 2175 return afinfo; 2176 } 2177 2178 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 2179 void xfrm_state_delete_tunnel(struct xfrm_state *x) 2180 { 2181 if (x->tunnel) { 2182 struct xfrm_state *t = x->tunnel; 2183 2184 if (atomic_read(&t->tunnel_users) == 2) 2185 xfrm_state_delete(t); 2186 atomic_dec(&t->tunnel_users); 2187 xfrm_state_put(t); 2188 x->tunnel = NULL; 2189 } 2190 } 2191 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 2192 2193 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 2194 { 2195 const struct xfrm_type *type = READ_ONCE(x->type); 2196 2197 if (x->km.state == XFRM_STATE_VALID && 2198 type && type->get_mtu) 2199 return type->get_mtu(x, mtu); 2200 2201 return mtu - x->props.header_len; 2202 } 2203 2204 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) 2205 { 2206 struct xfrm_state_afinfo *afinfo; 2207 struct xfrm_mode *inner_mode; 2208 int family = x->props.family; 2209 int err; 2210 2211 err = -EAFNOSUPPORT; 2212 afinfo = xfrm_state_get_afinfo(family); 2213 if (!afinfo) 2214 goto error; 2215 2216 err = 0; 2217 if (afinfo->init_flags) 2218 err = afinfo->init_flags(x); 2219 2220 rcu_read_unlock(); 2221 2222 if (err) 2223 goto error; 2224 2225 err = -EPROTONOSUPPORT; 2226 2227 if (x->sel.family != AF_UNSPEC) { 2228 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 2229 if (inner_mode == NULL) 2230 goto error; 2231 2232 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 2233 family != x->sel.family) { 2234 xfrm_put_mode(inner_mode); 2235 goto error; 2236 } 2237 2238 x->inner_mode = inner_mode; 2239 } else { 2240 struct xfrm_mode *inner_mode_iaf; 2241 int iafamily = AF_INET; 2242 2243 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 2244 if (inner_mode == NULL) 2245 goto error; 2246 2247 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 2248 xfrm_put_mode(inner_mode); 2249 goto error; 2250 } 2251 x->inner_mode = inner_mode; 2252 2253 if (x->props.family == AF_INET) 2254 iafamily = AF_INET6; 2255 2256 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2257 if (inner_mode_iaf) { 2258 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2259 x->inner_mode_iaf = inner_mode_iaf; 2260 else 2261 xfrm_put_mode(inner_mode_iaf); 2262 } 2263 } 2264 2265 x->type = xfrm_get_type(x->id.proto, family); 2266 if (x->type == NULL) 2267 goto error; 2268 2269 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); 2270 2271 err = x->type->init_state(x); 2272 if (err) 2273 goto error; 2274 2275 x->outer_mode = xfrm_get_mode(x->props.mode, family); 2276 if (x->outer_mode == NULL) { 2277 err = -EPROTONOSUPPORT; 2278 goto error; 2279 } 2280 2281 if (init_replay) { 2282 err = xfrm_init_replay(x); 2283 if (err) 2284 goto error; 2285 } 2286 2287 error: 2288 return err; 2289 } 2290 2291 EXPORT_SYMBOL(__xfrm_init_state); 2292 2293 int xfrm_init_state(struct xfrm_state *x) 2294 { 2295 int err; 2296 2297 err = __xfrm_init_state(x, true, false); 2298 if (!err) 2299 x->km.state = XFRM_STATE_VALID; 2300 2301 return err; 2302 } 2303 2304 EXPORT_SYMBOL(xfrm_init_state); 2305 2306 int __net_init xfrm_state_init(struct net *net) 2307 { 2308 unsigned int sz; 2309 2310 INIT_LIST_HEAD(&net->xfrm.state_all); 2311 2312 sz = sizeof(struct hlist_head) * 8; 2313 2314 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2315 if (!net->xfrm.state_bydst) 2316 goto out_bydst; 2317 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2318 if (!net->xfrm.state_bysrc) 2319 goto out_bysrc; 2320 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2321 if (!net->xfrm.state_byspi) 2322 goto out_byspi; 2323 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2324 2325 net->xfrm.state_num = 0; 2326 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2327 spin_lock_init(&net->xfrm.xfrm_state_lock); 2328 return 0; 2329 2330 out_byspi: 2331 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2332 out_bysrc: 2333 xfrm_hash_free(net->xfrm.state_bydst, sz); 2334 out_bydst: 2335 return -ENOMEM; 2336 } 2337 2338 void xfrm_state_fini(struct net *net) 2339 { 2340 unsigned int sz; 2341 2342 flush_work(&net->xfrm.state_hash_work); 2343 xfrm_state_flush(net, IPSEC_PROTO_ANY, false); 2344 flush_work(&xfrm_state_gc_work); 2345 2346 WARN_ON(!list_empty(&net->xfrm.state_all)); 2347 2348 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2349 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2350 xfrm_hash_free(net->xfrm.state_byspi, sz); 2351 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2352 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2353 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2354 xfrm_hash_free(net->xfrm.state_bydst, sz); 2355 } 2356 2357 #ifdef CONFIG_AUDITSYSCALL 2358 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2359 struct audit_buffer *audit_buf) 2360 { 2361 struct xfrm_sec_ctx *ctx = x->security; 2362 u32 spi = ntohl(x->id.spi); 2363 2364 if (ctx) 2365 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2366 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2367 2368 switch (x->props.family) { 2369 case AF_INET: 2370 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2371 &x->props.saddr.a4, &x->id.daddr.a4); 2372 break; 2373 case AF_INET6: 2374 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2375 x->props.saddr.a6, x->id.daddr.a6); 2376 break; 2377 } 2378 2379 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2380 } 2381 2382 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2383 struct audit_buffer *audit_buf) 2384 { 2385 const struct iphdr *iph4; 2386 const struct ipv6hdr *iph6; 2387 2388 switch (family) { 2389 case AF_INET: 2390 iph4 = ip_hdr(skb); 2391 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2392 &iph4->saddr, &iph4->daddr); 2393 break; 2394 case AF_INET6: 2395 iph6 = ipv6_hdr(skb); 2396 audit_log_format(audit_buf, 2397 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2398 &iph6->saddr, &iph6->daddr, 2399 iph6->flow_lbl[0] & 0x0f, 2400 iph6->flow_lbl[1], 2401 iph6->flow_lbl[2]); 2402 break; 2403 } 2404 } 2405 2406 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) 2407 { 2408 struct audit_buffer *audit_buf; 2409 2410 audit_buf = xfrm_audit_start("SAD-add"); 2411 if (audit_buf == NULL) 2412 return; 2413 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2414 xfrm_audit_helper_sainfo(x, audit_buf); 2415 audit_log_format(audit_buf, " res=%u", result); 2416 audit_log_end(audit_buf); 2417 } 2418 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2419 2420 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) 2421 { 2422 struct audit_buffer *audit_buf; 2423 2424 audit_buf = xfrm_audit_start("SAD-delete"); 2425 if (audit_buf == NULL) 2426 return; 2427 xfrm_audit_helper_usrinfo(task_valid, audit_buf); 2428 xfrm_audit_helper_sainfo(x, audit_buf); 2429 audit_log_format(audit_buf, " res=%u", result); 2430 audit_log_end(audit_buf); 2431 } 2432 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2433 2434 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2435 struct sk_buff *skb) 2436 { 2437 struct audit_buffer *audit_buf; 2438 u32 spi; 2439 2440 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2441 if (audit_buf == NULL) 2442 return; 2443 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2444 /* don't record the sequence number because it's inherent in this kind 2445 * of audit message */ 2446 spi = ntohl(x->id.spi); 2447 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2448 audit_log_end(audit_buf); 2449 } 2450 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2451 2452 void xfrm_audit_state_replay(struct xfrm_state *x, 2453 struct sk_buff *skb, __be32 net_seq) 2454 { 2455 struct audit_buffer *audit_buf; 2456 u32 spi; 2457 2458 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2459 if (audit_buf == NULL) 2460 return; 2461 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2462 spi = ntohl(x->id.spi); 2463 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2464 spi, spi, ntohl(net_seq)); 2465 audit_log_end(audit_buf); 2466 } 2467 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2468 2469 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2470 { 2471 struct audit_buffer *audit_buf; 2472 2473 audit_buf = xfrm_audit_start("SA-notfound"); 2474 if (audit_buf == NULL) 2475 return; 2476 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2477 audit_log_end(audit_buf); 2478 } 2479 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2480 2481 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2482 __be32 net_spi, __be32 net_seq) 2483 { 2484 struct audit_buffer *audit_buf; 2485 u32 spi; 2486 2487 audit_buf = xfrm_audit_start("SA-notfound"); 2488 if (audit_buf == NULL) 2489 return; 2490 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2491 spi = ntohl(net_spi); 2492 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2493 spi, spi, ntohl(net_seq)); 2494 audit_log_end(audit_buf); 2495 } 2496 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2497 2498 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2499 struct sk_buff *skb, u8 proto) 2500 { 2501 struct audit_buffer *audit_buf; 2502 __be32 net_spi; 2503 __be32 net_seq; 2504 2505 audit_buf = xfrm_audit_start("SA-icv-failure"); 2506 if (audit_buf == NULL) 2507 return; 2508 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2509 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2510 u32 spi = ntohl(net_spi); 2511 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2512 spi, spi, ntohl(net_seq)); 2513 } 2514 audit_log_end(audit_buf); 2515 } 2516 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2517 #endif /* CONFIG_AUDITSYSCALL */ 2518