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(struct timer_list *t); 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 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); 578 x->curlft.add_time = get_seconds(); 579 x->lft.soft_byte_limit = XFRM_INF; 580 x->lft.soft_packet_limit = XFRM_INF; 581 x->lft.hard_byte_limit = XFRM_INF; 582 x->lft.hard_packet_limit = XFRM_INF; 583 x->replay_maxage = 0; 584 x->replay_maxdiff = 0; 585 x->inner_mode = NULL; 586 x->inner_mode_iaf = NULL; 587 spin_lock_init(&x->lock); 588 } 589 return x; 590 } 591 EXPORT_SYMBOL(xfrm_state_alloc); 592 593 void __xfrm_state_destroy(struct xfrm_state *x) 594 { 595 WARN_ON(x->km.state != XFRM_STATE_DEAD); 596 597 spin_lock_bh(&xfrm_state_gc_lock); 598 hlist_add_head(&x->gclist, &xfrm_state_gc_list); 599 spin_unlock_bh(&xfrm_state_gc_lock); 600 schedule_work(&xfrm_state_gc_work); 601 } 602 EXPORT_SYMBOL(__xfrm_state_destroy); 603 604 int __xfrm_state_delete(struct xfrm_state *x) 605 { 606 struct net *net = xs_net(x); 607 int err = -ESRCH; 608 609 if (x->km.state != XFRM_STATE_DEAD) { 610 x->km.state = XFRM_STATE_DEAD; 611 spin_lock(&net->xfrm.xfrm_state_lock); 612 list_del(&x->km.all); 613 hlist_del_rcu(&x->bydst); 614 hlist_del_rcu(&x->bysrc); 615 if (x->id.spi) 616 hlist_del_rcu(&x->byspi); 617 net->xfrm.state_num--; 618 spin_unlock(&net->xfrm.xfrm_state_lock); 619 620 xfrm_dev_state_delete(x); 621 622 /* All xfrm_state objects are created by xfrm_state_alloc. 623 * The xfrm_state_alloc call gives a reference, and that 624 * is what we are dropping here. 625 */ 626 xfrm_state_put(x); 627 err = 0; 628 } 629 630 return err; 631 } 632 EXPORT_SYMBOL(__xfrm_state_delete); 633 634 int xfrm_state_delete(struct xfrm_state *x) 635 { 636 int err; 637 638 spin_lock_bh(&x->lock); 639 err = __xfrm_state_delete(x); 640 spin_unlock_bh(&x->lock); 641 642 return err; 643 } 644 EXPORT_SYMBOL(xfrm_state_delete); 645 646 #ifdef CONFIG_SECURITY_NETWORK_XFRM 647 static inline int 648 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 649 { 650 int i, err = 0; 651 652 for (i = 0; i <= net->xfrm.state_hmask; i++) { 653 struct xfrm_state *x; 654 655 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 656 if (xfrm_id_proto_match(x->id.proto, proto) && 657 (err = security_xfrm_state_delete(x)) != 0) { 658 xfrm_audit_state_delete(x, 0, task_valid); 659 return err; 660 } 661 } 662 } 663 664 return err; 665 } 666 667 static inline int 668 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 669 { 670 int i, err = 0; 671 672 for (i = 0; i <= net->xfrm.state_hmask; i++) { 673 struct xfrm_state *x; 674 struct xfrm_state_offload *xso; 675 676 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 677 xso = &x->xso; 678 679 if (xso->dev == dev && 680 (err = security_xfrm_state_delete(x)) != 0) { 681 xfrm_audit_state_delete(x, 0, task_valid); 682 return err; 683 } 684 } 685 } 686 687 return err; 688 } 689 #else 690 static inline int 691 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) 692 { 693 return 0; 694 } 695 696 static inline int 697 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) 698 { 699 return 0; 700 } 701 #endif 702 703 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) 704 { 705 int i, err = 0, cnt = 0; 706 707 spin_lock_bh(&net->xfrm.xfrm_state_lock); 708 err = xfrm_state_flush_secctx_check(net, proto, task_valid); 709 if (err) 710 goto out; 711 712 err = -ESRCH; 713 for (i = 0; i <= net->xfrm.state_hmask; i++) { 714 struct xfrm_state *x; 715 restart: 716 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 717 if (!xfrm_state_kern(x) && 718 xfrm_id_proto_match(x->id.proto, proto)) { 719 xfrm_state_hold(x); 720 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 721 722 err = xfrm_state_delete(x); 723 xfrm_audit_state_delete(x, err ? 0 : 1, 724 task_valid); 725 xfrm_state_put(x); 726 if (!err) 727 cnt++; 728 729 spin_lock_bh(&net->xfrm.xfrm_state_lock); 730 goto restart; 731 } 732 } 733 } 734 out: 735 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 736 if (cnt) { 737 err = 0; 738 xfrm_policy_cache_flush(); 739 } 740 return err; 741 } 742 EXPORT_SYMBOL(xfrm_state_flush); 743 744 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) 745 { 746 int i, err = 0, cnt = 0; 747 748 spin_lock_bh(&net->xfrm.xfrm_state_lock); 749 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); 750 if (err) 751 goto out; 752 753 err = -ESRCH; 754 for (i = 0; i <= net->xfrm.state_hmask; i++) { 755 struct xfrm_state *x; 756 struct xfrm_state_offload *xso; 757 restart: 758 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 759 xso = &x->xso; 760 761 if (!xfrm_state_kern(x) && xso->dev == dev) { 762 xfrm_state_hold(x); 763 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 764 765 err = xfrm_state_delete(x); 766 xfrm_audit_state_delete(x, err ? 0 : 1, 767 task_valid); 768 xfrm_state_put(x); 769 if (!err) 770 cnt++; 771 772 spin_lock_bh(&net->xfrm.xfrm_state_lock); 773 goto restart; 774 } 775 } 776 } 777 if (cnt) 778 err = 0; 779 780 out: 781 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 782 return err; 783 } 784 EXPORT_SYMBOL(xfrm_dev_state_flush); 785 786 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 787 { 788 spin_lock_bh(&net->xfrm.xfrm_state_lock); 789 si->sadcnt = net->xfrm.state_num; 790 si->sadhcnt = net->xfrm.state_hmask; 791 si->sadhmcnt = xfrm_state_hashmax; 792 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 793 } 794 EXPORT_SYMBOL(xfrm_sad_getinfo); 795 796 static void 797 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 798 const struct xfrm_tmpl *tmpl, 799 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 800 unsigned short family) 801 { 802 struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family); 803 804 if (!afinfo) 805 return; 806 807 afinfo->init_tempsel(&x->sel, fl); 808 809 if (family != tmpl->encap_family) { 810 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family); 811 if (!afinfo) 812 return; 813 } 814 afinfo->init_temprop(x, tmpl, daddr, saddr); 815 } 816 817 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 818 const xfrm_address_t *daddr, 819 __be32 spi, u8 proto, 820 unsigned short family) 821 { 822 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 823 struct xfrm_state *x; 824 825 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { 826 if (x->props.family != family || 827 x->id.spi != spi || 828 x->id.proto != proto || 829 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 830 continue; 831 832 if ((mark & x->mark.m) != x->mark.v) 833 continue; 834 if (!xfrm_state_hold_rcu(x)) 835 continue; 836 return x; 837 } 838 839 return NULL; 840 } 841 842 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 843 const xfrm_address_t *daddr, 844 const xfrm_address_t *saddr, 845 u8 proto, unsigned short family) 846 { 847 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 848 struct xfrm_state *x; 849 850 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { 851 if (x->props.family != family || 852 x->id.proto != proto || 853 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 854 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 855 continue; 856 857 if ((mark & x->mark.m) != x->mark.v) 858 continue; 859 if (!xfrm_state_hold_rcu(x)) 860 continue; 861 return x; 862 } 863 864 return NULL; 865 } 866 867 static inline struct xfrm_state * 868 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 869 { 870 struct net *net = xs_net(x); 871 u32 mark = x->mark.v & x->mark.m; 872 873 if (use_spi) 874 return __xfrm_state_lookup(net, mark, &x->id.daddr, 875 x->id.spi, x->id.proto, family); 876 else 877 return __xfrm_state_lookup_byaddr(net, mark, 878 &x->id.daddr, 879 &x->props.saddr, 880 x->id.proto, family); 881 } 882 883 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 884 { 885 if (have_hash_collision && 886 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 887 net->xfrm.state_num > net->xfrm.state_hmask) 888 schedule_work(&net->xfrm.state_hash_work); 889 } 890 891 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 892 const struct flowi *fl, unsigned short family, 893 struct xfrm_state **best, int *acq_in_progress, 894 int *error) 895 { 896 /* Resolution logic: 897 * 1. There is a valid state with matching selector. Done. 898 * 2. Valid state with inappropriate selector. Skip. 899 * 900 * Entering area of "sysdeps". 901 * 902 * 3. If state is not valid, selector is temporary, it selects 903 * only session which triggered previous resolution. Key 904 * manager will do something to install a state with proper 905 * selector. 906 */ 907 if (x->km.state == XFRM_STATE_VALID) { 908 if ((x->sel.family && 909 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 910 !security_xfrm_state_pol_flow_match(x, pol, fl)) 911 return; 912 913 if (!*best || 914 (*best)->km.dying > x->km.dying || 915 ((*best)->km.dying == x->km.dying && 916 (*best)->curlft.add_time < x->curlft.add_time)) 917 *best = x; 918 } else if (x->km.state == XFRM_STATE_ACQ) { 919 *acq_in_progress = 1; 920 } else if (x->km.state == XFRM_STATE_ERROR || 921 x->km.state == XFRM_STATE_EXPIRED) { 922 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 923 security_xfrm_state_pol_flow_match(x, pol, fl)) 924 *error = -ESRCH; 925 } 926 } 927 928 struct xfrm_state * 929 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 930 const struct flowi *fl, struct xfrm_tmpl *tmpl, 931 struct xfrm_policy *pol, int *err, 932 unsigned short family) 933 { 934 static xfrm_address_t saddr_wildcard = { }; 935 struct net *net = xp_net(pol); 936 unsigned int h, h_wildcard; 937 struct xfrm_state *x, *x0, *to_put; 938 int acquire_in_progress = 0; 939 int error = 0; 940 struct xfrm_state *best = NULL; 941 u32 mark = pol->mark.v & pol->mark.m; 942 unsigned short encap_family = tmpl->encap_family; 943 unsigned int sequence; 944 struct km_event c; 945 946 to_put = NULL; 947 948 sequence = read_seqcount_begin(&xfrm_state_hash_generation); 949 950 rcu_read_lock(); 951 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 952 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { 953 if (x->props.family == encap_family && 954 x->props.reqid == tmpl->reqid && 955 (mark & x->mark.m) == x->mark.v && 956 !(x->props.flags & XFRM_STATE_WILDRECV) && 957 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 958 tmpl->mode == x->props.mode && 959 tmpl->id.proto == x->id.proto && 960 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 961 xfrm_state_look_at(pol, x, fl, encap_family, 962 &best, &acquire_in_progress, &error); 963 } 964 if (best || acquire_in_progress) 965 goto found; 966 967 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 968 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { 969 if (x->props.family == encap_family && 970 x->props.reqid == tmpl->reqid && 971 (mark & x->mark.m) == x->mark.v && 972 !(x->props.flags & XFRM_STATE_WILDRECV) && 973 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 974 tmpl->mode == x->props.mode && 975 tmpl->id.proto == x->id.proto && 976 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 977 xfrm_state_look_at(pol, x, fl, encap_family, 978 &best, &acquire_in_progress, &error); 979 } 980 981 found: 982 x = best; 983 if (!x && !error && !acquire_in_progress) { 984 if (tmpl->id.spi && 985 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 986 tmpl->id.proto, encap_family)) != NULL) { 987 to_put = x0; 988 error = -EEXIST; 989 goto out; 990 } 991 992 c.net = net; 993 /* If the KMs have no listeners (yet...), avoid allocating an SA 994 * for each and every packet - garbage collection might not 995 * handle the flood. 996 */ 997 if (!km_is_alive(&c)) { 998 error = -ESRCH; 999 goto out; 1000 } 1001 1002 x = xfrm_state_alloc(net); 1003 if (x == NULL) { 1004 error = -ENOMEM; 1005 goto out; 1006 } 1007 /* Initialize temporary state matching only 1008 * to current session. */ 1009 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 1010 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 1011 1012 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 1013 if (error) { 1014 x->km.state = XFRM_STATE_DEAD; 1015 to_put = x; 1016 x = NULL; 1017 goto out; 1018 } 1019 1020 if (km_query(x, tmpl, pol) == 0) { 1021 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1022 x->km.state = XFRM_STATE_ACQ; 1023 list_add(&x->km.all, &net->xfrm.state_all); 1024 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1025 h = xfrm_src_hash(net, daddr, saddr, encap_family); 1026 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1027 if (x->id.spi) { 1028 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 1029 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1030 } 1031 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1032 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1033 net->xfrm.state_num++; 1034 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1035 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1036 } else { 1037 x->km.state = XFRM_STATE_DEAD; 1038 to_put = x; 1039 x = NULL; 1040 error = -ESRCH; 1041 } 1042 } 1043 out: 1044 if (x) { 1045 if (!xfrm_state_hold_rcu(x)) { 1046 *err = -EAGAIN; 1047 x = NULL; 1048 } 1049 } else { 1050 *err = acquire_in_progress ? -EAGAIN : error; 1051 } 1052 rcu_read_unlock(); 1053 if (to_put) 1054 xfrm_state_put(to_put); 1055 1056 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { 1057 *err = -EAGAIN; 1058 if (x) { 1059 xfrm_state_put(x); 1060 x = NULL; 1061 } 1062 } 1063 1064 return x; 1065 } 1066 1067 struct xfrm_state * 1068 xfrm_stateonly_find(struct net *net, u32 mark, 1069 xfrm_address_t *daddr, xfrm_address_t *saddr, 1070 unsigned short family, u8 mode, u8 proto, u32 reqid) 1071 { 1072 unsigned int h; 1073 struct xfrm_state *rx = NULL, *x = NULL; 1074 1075 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1076 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1077 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1078 if (x->props.family == family && 1079 x->props.reqid == reqid && 1080 (mark & x->mark.m) == x->mark.v && 1081 !(x->props.flags & XFRM_STATE_WILDRECV) && 1082 xfrm_state_addr_check(x, daddr, saddr, family) && 1083 mode == x->props.mode && 1084 proto == x->id.proto && 1085 x->km.state == XFRM_STATE_VALID) { 1086 rx = x; 1087 break; 1088 } 1089 } 1090 1091 if (rx) 1092 xfrm_state_hold(rx); 1093 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1094 1095 1096 return rx; 1097 } 1098 EXPORT_SYMBOL(xfrm_stateonly_find); 1099 1100 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1101 unsigned short family) 1102 { 1103 struct xfrm_state *x; 1104 struct xfrm_state_walk *w; 1105 1106 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1107 list_for_each_entry(w, &net->xfrm.state_all, all) { 1108 x = container_of(w, struct xfrm_state, km); 1109 if (x->props.family != family || 1110 x->id.spi != spi) 1111 continue; 1112 1113 xfrm_state_hold(x); 1114 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1115 return x; 1116 } 1117 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1118 return NULL; 1119 } 1120 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 1121 1122 static void __xfrm_state_insert(struct xfrm_state *x) 1123 { 1124 struct net *net = xs_net(x); 1125 unsigned int h; 1126 1127 list_add(&x->km.all, &net->xfrm.state_all); 1128 1129 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 1130 x->props.reqid, x->props.family); 1131 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1132 1133 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 1134 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1135 1136 if (x->id.spi) { 1137 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 1138 x->props.family); 1139 1140 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1141 } 1142 1143 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1144 if (x->replay_maxage) 1145 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 1146 1147 net->xfrm.state_num++; 1148 1149 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1150 } 1151 1152 /* net->xfrm.xfrm_state_lock is held */ 1153 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 1154 { 1155 struct net *net = xs_net(xnew); 1156 unsigned short family = xnew->props.family; 1157 u32 reqid = xnew->props.reqid; 1158 struct xfrm_state *x; 1159 unsigned int h; 1160 u32 mark = xnew->mark.v & xnew->mark.m; 1161 1162 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 1163 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1164 if (x->props.family == family && 1165 x->props.reqid == reqid && 1166 (mark & x->mark.m) == x->mark.v && 1167 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 1168 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 1169 x->genid++; 1170 } 1171 } 1172 1173 void xfrm_state_insert(struct xfrm_state *x) 1174 { 1175 struct net *net = xs_net(x); 1176 1177 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1178 __xfrm_state_bump_genids(x); 1179 __xfrm_state_insert(x); 1180 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1181 } 1182 EXPORT_SYMBOL(xfrm_state_insert); 1183 1184 /* net->xfrm.xfrm_state_lock is held */ 1185 static struct xfrm_state *__find_acq_core(struct net *net, 1186 const struct xfrm_mark *m, 1187 unsigned short family, u8 mode, 1188 u32 reqid, u8 proto, 1189 const xfrm_address_t *daddr, 1190 const xfrm_address_t *saddr, 1191 int create) 1192 { 1193 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1194 struct xfrm_state *x; 1195 u32 mark = m->v & m->m; 1196 1197 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1198 if (x->props.reqid != reqid || 1199 x->props.mode != mode || 1200 x->props.family != family || 1201 x->km.state != XFRM_STATE_ACQ || 1202 x->id.spi != 0 || 1203 x->id.proto != proto || 1204 (mark & x->mark.m) != x->mark.v || 1205 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1206 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1207 continue; 1208 1209 xfrm_state_hold(x); 1210 return x; 1211 } 1212 1213 if (!create) 1214 return NULL; 1215 1216 x = xfrm_state_alloc(net); 1217 if (likely(x)) { 1218 switch (family) { 1219 case AF_INET: 1220 x->sel.daddr.a4 = daddr->a4; 1221 x->sel.saddr.a4 = saddr->a4; 1222 x->sel.prefixlen_d = 32; 1223 x->sel.prefixlen_s = 32; 1224 x->props.saddr.a4 = saddr->a4; 1225 x->id.daddr.a4 = daddr->a4; 1226 break; 1227 1228 case AF_INET6: 1229 x->sel.daddr.in6 = daddr->in6; 1230 x->sel.saddr.in6 = saddr->in6; 1231 x->sel.prefixlen_d = 128; 1232 x->sel.prefixlen_s = 128; 1233 x->props.saddr.in6 = saddr->in6; 1234 x->id.daddr.in6 = daddr->in6; 1235 break; 1236 } 1237 1238 x->km.state = XFRM_STATE_ACQ; 1239 x->id.proto = proto; 1240 x->props.family = family; 1241 x->props.mode = mode; 1242 x->props.reqid = reqid; 1243 x->mark.v = m->v; 1244 x->mark.m = m->m; 1245 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1246 xfrm_state_hold(x); 1247 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1248 list_add(&x->km.all, &net->xfrm.state_all); 1249 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); 1250 h = xfrm_src_hash(net, daddr, saddr, family); 1251 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); 1252 1253 net->xfrm.state_num++; 1254 1255 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1256 } 1257 1258 return x; 1259 } 1260 1261 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1262 1263 int xfrm_state_add(struct xfrm_state *x) 1264 { 1265 struct net *net = xs_net(x); 1266 struct xfrm_state *x1, *to_put; 1267 int family; 1268 int err; 1269 u32 mark = x->mark.v & x->mark.m; 1270 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1271 1272 family = x->props.family; 1273 1274 to_put = NULL; 1275 1276 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1277 1278 x1 = __xfrm_state_locate(x, use_spi, family); 1279 if (x1) { 1280 to_put = x1; 1281 x1 = NULL; 1282 err = -EEXIST; 1283 goto out; 1284 } 1285 1286 if (use_spi && x->km.seq) { 1287 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1288 if (x1 && ((x1->id.proto != x->id.proto) || 1289 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1290 to_put = x1; 1291 x1 = NULL; 1292 } 1293 } 1294 1295 if (use_spi && !x1) 1296 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1297 x->props.reqid, x->id.proto, 1298 &x->id.daddr, &x->props.saddr, 0); 1299 1300 __xfrm_state_bump_genids(x); 1301 __xfrm_state_insert(x); 1302 err = 0; 1303 1304 out: 1305 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1306 1307 if (x1) { 1308 xfrm_state_delete(x1); 1309 xfrm_state_put(x1); 1310 } 1311 1312 if (to_put) 1313 xfrm_state_put(to_put); 1314 1315 return err; 1316 } 1317 EXPORT_SYMBOL(xfrm_state_add); 1318 1319 #ifdef CONFIG_XFRM_MIGRATE 1320 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, 1321 struct xfrm_encap_tmpl *encap) 1322 { 1323 struct net *net = xs_net(orig); 1324 struct xfrm_state *x = xfrm_state_alloc(net); 1325 if (!x) 1326 goto out; 1327 1328 memcpy(&x->id, &orig->id, sizeof(x->id)); 1329 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1330 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1331 x->props.mode = orig->props.mode; 1332 x->props.replay_window = orig->props.replay_window; 1333 x->props.reqid = orig->props.reqid; 1334 x->props.family = orig->props.family; 1335 x->props.saddr = orig->props.saddr; 1336 1337 if (orig->aalg) { 1338 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1339 if (!x->aalg) 1340 goto error; 1341 } 1342 x->props.aalgo = orig->props.aalgo; 1343 1344 if (orig->aead) { 1345 x->aead = xfrm_algo_aead_clone(orig->aead); 1346 if (!x->aead) 1347 goto error; 1348 } 1349 if (orig->ealg) { 1350 x->ealg = xfrm_algo_clone(orig->ealg); 1351 if (!x->ealg) 1352 goto error; 1353 } 1354 x->props.ealgo = orig->props.ealgo; 1355 1356 if (orig->calg) { 1357 x->calg = xfrm_algo_clone(orig->calg); 1358 if (!x->calg) 1359 goto error; 1360 } 1361 x->props.calgo = orig->props.calgo; 1362 1363 if (encap || orig->encap) { 1364 if (encap) 1365 x->encap = kmemdup(encap, sizeof(*x->encap), 1366 GFP_KERNEL); 1367 else 1368 x->encap = kmemdup(orig->encap, sizeof(*x->encap), 1369 GFP_KERNEL); 1370 1371 if (!x->encap) 1372 goto error; 1373 } 1374 1375 if (orig->coaddr) { 1376 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1377 GFP_KERNEL); 1378 if (!x->coaddr) 1379 goto error; 1380 } 1381 1382 if (orig->replay_esn) { 1383 if (xfrm_replay_clone(x, orig)) 1384 goto error; 1385 } 1386 1387 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1388 1389 if (xfrm_init_state(x) < 0) 1390 goto error; 1391 1392 x->props.flags = orig->props.flags; 1393 x->props.extra_flags = orig->props.extra_flags; 1394 1395 x->tfcpad = orig->tfcpad; 1396 x->replay_maxdiff = orig->replay_maxdiff; 1397 x->replay_maxage = orig->replay_maxage; 1398 x->curlft.add_time = orig->curlft.add_time; 1399 x->km.state = orig->km.state; 1400 x->km.seq = orig->km.seq; 1401 x->replay = orig->replay; 1402 x->preplay = orig->preplay; 1403 1404 return x; 1405 1406 error: 1407 xfrm_state_put(x); 1408 out: 1409 return NULL; 1410 } 1411 1412 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1413 { 1414 unsigned int h; 1415 struct xfrm_state *x = NULL; 1416 1417 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1418 1419 if (m->reqid) { 1420 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1421 m->reqid, m->old_family); 1422 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1423 if (x->props.mode != m->mode || 1424 x->id.proto != m->proto) 1425 continue; 1426 if (m->reqid && x->props.reqid != m->reqid) 1427 continue; 1428 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1429 m->old_family) || 1430 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1431 m->old_family)) 1432 continue; 1433 xfrm_state_hold(x); 1434 break; 1435 } 1436 } else { 1437 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1438 m->old_family); 1439 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1440 if (x->props.mode != m->mode || 1441 x->id.proto != m->proto) 1442 continue; 1443 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1444 m->old_family) || 1445 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1446 m->old_family)) 1447 continue; 1448 xfrm_state_hold(x); 1449 break; 1450 } 1451 } 1452 1453 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1454 1455 return x; 1456 } 1457 EXPORT_SYMBOL(xfrm_migrate_state_find); 1458 1459 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1460 struct xfrm_migrate *m, 1461 struct xfrm_encap_tmpl *encap) 1462 { 1463 struct xfrm_state *xc; 1464 1465 xc = xfrm_state_clone(x, encap); 1466 if (!xc) 1467 return NULL; 1468 1469 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1470 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1471 1472 /* add state */ 1473 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1474 /* a care is needed when the destination address of the 1475 state is to be updated as it is a part of triplet */ 1476 xfrm_state_insert(xc); 1477 } else { 1478 if (xfrm_state_add(xc) < 0) 1479 goto error; 1480 } 1481 1482 return xc; 1483 error: 1484 xfrm_state_put(xc); 1485 return NULL; 1486 } 1487 EXPORT_SYMBOL(xfrm_state_migrate); 1488 #endif 1489 1490 int xfrm_state_update(struct xfrm_state *x) 1491 { 1492 struct xfrm_state *x1, *to_put; 1493 int err; 1494 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1495 struct net *net = xs_net(x); 1496 1497 to_put = NULL; 1498 1499 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1500 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1501 1502 err = -ESRCH; 1503 if (!x1) 1504 goto out; 1505 1506 if (xfrm_state_kern(x1)) { 1507 to_put = x1; 1508 err = -EEXIST; 1509 goto out; 1510 } 1511 1512 if (x1->km.state == XFRM_STATE_ACQ) { 1513 __xfrm_state_insert(x); 1514 x = NULL; 1515 } 1516 err = 0; 1517 1518 out: 1519 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1520 1521 if (to_put) 1522 xfrm_state_put(to_put); 1523 1524 if (err) 1525 return err; 1526 1527 if (!x) { 1528 xfrm_state_delete(x1); 1529 xfrm_state_put(x1); 1530 return 0; 1531 } 1532 1533 err = -EINVAL; 1534 spin_lock_bh(&x1->lock); 1535 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1536 if (x->encap && x1->encap) 1537 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1538 if (x->coaddr && x1->coaddr) { 1539 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1540 } 1541 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1542 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1543 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1544 x1->km.dying = 0; 1545 1546 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1547 if (x1->curlft.use_time) 1548 xfrm_state_check_expire(x1); 1549 1550 err = 0; 1551 x->km.state = XFRM_STATE_DEAD; 1552 __xfrm_state_put(x); 1553 } 1554 spin_unlock_bh(&x1->lock); 1555 1556 xfrm_state_put(x1); 1557 1558 return err; 1559 } 1560 EXPORT_SYMBOL(xfrm_state_update); 1561 1562 int xfrm_state_check_expire(struct xfrm_state *x) 1563 { 1564 if (!x->curlft.use_time) 1565 x->curlft.use_time = get_seconds(); 1566 1567 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1568 x->curlft.packets >= x->lft.hard_packet_limit) { 1569 x->km.state = XFRM_STATE_EXPIRED; 1570 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL); 1571 return -EINVAL; 1572 } 1573 1574 if (!x->km.dying && 1575 (x->curlft.bytes >= x->lft.soft_byte_limit || 1576 x->curlft.packets >= x->lft.soft_packet_limit)) { 1577 x->km.dying = 1; 1578 km_state_expired(x, 0, 0); 1579 } 1580 return 0; 1581 } 1582 EXPORT_SYMBOL(xfrm_state_check_expire); 1583 1584 struct xfrm_state * 1585 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1586 u8 proto, unsigned short family) 1587 { 1588 struct xfrm_state *x; 1589 1590 rcu_read_lock(); 1591 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1592 rcu_read_unlock(); 1593 return x; 1594 } 1595 EXPORT_SYMBOL(xfrm_state_lookup); 1596 1597 struct xfrm_state * 1598 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1599 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1600 u8 proto, unsigned short family) 1601 { 1602 struct xfrm_state *x; 1603 1604 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1605 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1606 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1607 return x; 1608 } 1609 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1610 1611 struct xfrm_state * 1612 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1613 u8 proto, const xfrm_address_t *daddr, 1614 const xfrm_address_t *saddr, int create, unsigned short family) 1615 { 1616 struct xfrm_state *x; 1617 1618 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1619 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1620 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1621 1622 return x; 1623 } 1624 EXPORT_SYMBOL(xfrm_find_acq); 1625 1626 #ifdef CONFIG_XFRM_SUB_POLICY 1627 int 1628 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1629 unsigned short family, struct net *net) 1630 { 1631 int i; 1632 int err = 0; 1633 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1634 if (!afinfo) 1635 return -EAFNOSUPPORT; 1636 1637 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ 1638 if (afinfo->tmpl_sort) 1639 err = afinfo->tmpl_sort(dst, src, n); 1640 else 1641 for (i = 0; i < n; i++) 1642 dst[i] = src[i]; 1643 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1644 rcu_read_unlock(); 1645 return err; 1646 } 1647 EXPORT_SYMBOL(xfrm_tmpl_sort); 1648 1649 int 1650 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1651 unsigned short family) 1652 { 1653 int i; 1654 int err = 0; 1655 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1656 struct net *net = xs_net(*src); 1657 1658 if (!afinfo) 1659 return -EAFNOSUPPORT; 1660 1661 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1662 if (afinfo->state_sort) 1663 err = afinfo->state_sort(dst, src, n); 1664 else 1665 for (i = 0; i < n; i++) 1666 dst[i] = src[i]; 1667 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1668 rcu_read_unlock(); 1669 return err; 1670 } 1671 EXPORT_SYMBOL(xfrm_state_sort); 1672 #endif 1673 1674 /* Silly enough, but I'm lazy to build resolution list */ 1675 1676 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1677 { 1678 int i; 1679 1680 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1681 struct xfrm_state *x; 1682 1683 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1684 if (x->km.seq == seq && 1685 (mark & x->mark.m) == x->mark.v && 1686 x->km.state == XFRM_STATE_ACQ) { 1687 xfrm_state_hold(x); 1688 return x; 1689 } 1690 } 1691 } 1692 return NULL; 1693 } 1694 1695 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1696 { 1697 struct xfrm_state *x; 1698 1699 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1700 x = __xfrm_find_acq_byseq(net, mark, seq); 1701 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1702 return x; 1703 } 1704 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1705 1706 u32 xfrm_get_acqseq(void) 1707 { 1708 u32 res; 1709 static atomic_t acqseq; 1710 1711 do { 1712 res = atomic_inc_return(&acqseq); 1713 } while (!res); 1714 1715 return res; 1716 } 1717 EXPORT_SYMBOL(xfrm_get_acqseq); 1718 1719 int verify_spi_info(u8 proto, u32 min, u32 max) 1720 { 1721 switch (proto) { 1722 case IPPROTO_AH: 1723 case IPPROTO_ESP: 1724 break; 1725 1726 case IPPROTO_COMP: 1727 /* IPCOMP spi is 16-bits. */ 1728 if (max >= 0x10000) 1729 return -EINVAL; 1730 break; 1731 1732 default: 1733 return -EINVAL; 1734 } 1735 1736 if (min > max) 1737 return -EINVAL; 1738 1739 return 0; 1740 } 1741 EXPORT_SYMBOL(verify_spi_info); 1742 1743 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1744 { 1745 struct net *net = xs_net(x); 1746 unsigned int h; 1747 struct xfrm_state *x0; 1748 int err = -ENOENT; 1749 __be32 minspi = htonl(low); 1750 __be32 maxspi = htonl(high); 1751 u32 mark = x->mark.v & x->mark.m; 1752 1753 spin_lock_bh(&x->lock); 1754 if (x->km.state == XFRM_STATE_DEAD) 1755 goto unlock; 1756 1757 err = 0; 1758 if (x->id.spi) 1759 goto unlock; 1760 1761 err = -ENOENT; 1762 1763 if (minspi == maxspi) { 1764 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1765 if (x0) { 1766 xfrm_state_put(x0); 1767 goto unlock; 1768 } 1769 x->id.spi = minspi; 1770 } else { 1771 u32 spi = 0; 1772 for (h = 0; h < high-low+1; h++) { 1773 spi = low + prandom_u32()%(high-low+1); 1774 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1775 if (x0 == NULL) { 1776 x->id.spi = htonl(spi); 1777 break; 1778 } 1779 xfrm_state_put(x0); 1780 } 1781 } 1782 if (x->id.spi) { 1783 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1784 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1785 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); 1786 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1787 1788 err = 0; 1789 } 1790 1791 unlock: 1792 spin_unlock_bh(&x->lock); 1793 1794 return err; 1795 } 1796 EXPORT_SYMBOL(xfrm_alloc_spi); 1797 1798 static bool __xfrm_state_filter_match(struct xfrm_state *x, 1799 struct xfrm_address_filter *filter) 1800 { 1801 if (filter) { 1802 if ((filter->family == AF_INET || 1803 filter->family == AF_INET6) && 1804 x->props.family != filter->family) 1805 return false; 1806 1807 return addr_match(&x->props.saddr, &filter->saddr, 1808 filter->splen) && 1809 addr_match(&x->id.daddr, &filter->daddr, 1810 filter->dplen); 1811 } 1812 return true; 1813 } 1814 1815 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1816 int (*func)(struct xfrm_state *, int, void*), 1817 void *data) 1818 { 1819 struct xfrm_state *state; 1820 struct xfrm_state_walk *x; 1821 int err = 0; 1822 1823 if (walk->seq != 0 && list_empty(&walk->all)) 1824 return 0; 1825 1826 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1827 if (list_empty(&walk->all)) 1828 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1829 else 1830 x = list_first_entry(&walk->all, struct xfrm_state_walk, all); 1831 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1832 if (x->state == XFRM_STATE_DEAD) 1833 continue; 1834 state = container_of(x, struct xfrm_state, km); 1835 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1836 continue; 1837 if (!__xfrm_state_filter_match(state, walk->filter)) 1838 continue; 1839 err = func(state, walk->seq, data); 1840 if (err) { 1841 list_move_tail(&walk->all, &x->all); 1842 goto out; 1843 } 1844 walk->seq++; 1845 } 1846 if (walk->seq == 0) { 1847 err = -ENOENT; 1848 goto out; 1849 } 1850 list_del_init(&walk->all); 1851 out: 1852 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1853 return err; 1854 } 1855 EXPORT_SYMBOL(xfrm_state_walk); 1856 1857 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1858 struct xfrm_address_filter *filter) 1859 { 1860 INIT_LIST_HEAD(&walk->all); 1861 walk->proto = proto; 1862 walk->state = XFRM_STATE_DEAD; 1863 walk->seq = 0; 1864 walk->filter = filter; 1865 } 1866 EXPORT_SYMBOL(xfrm_state_walk_init); 1867 1868 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 1869 { 1870 kfree(walk->filter); 1871 1872 if (list_empty(&walk->all)) 1873 return; 1874 1875 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1876 list_del(&walk->all); 1877 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1878 } 1879 EXPORT_SYMBOL(xfrm_state_walk_done); 1880 1881 static void xfrm_replay_timer_handler(struct timer_list *t) 1882 { 1883 struct xfrm_state *x = from_timer(x, t, rtimer); 1884 1885 spin_lock(&x->lock); 1886 1887 if (x->km.state == XFRM_STATE_VALID) { 1888 if (xfrm_aevent_is_on(xs_net(x))) 1889 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1890 else 1891 x->xflags |= XFRM_TIME_DEFER; 1892 } 1893 1894 spin_unlock(&x->lock); 1895 } 1896 1897 static LIST_HEAD(xfrm_km_list); 1898 1899 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1900 { 1901 struct xfrm_mgr *km; 1902 1903 rcu_read_lock(); 1904 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1905 if (km->notify_policy) 1906 km->notify_policy(xp, dir, c); 1907 rcu_read_unlock(); 1908 } 1909 1910 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1911 { 1912 struct xfrm_mgr *km; 1913 rcu_read_lock(); 1914 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1915 if (km->notify) 1916 km->notify(x, c); 1917 rcu_read_unlock(); 1918 } 1919 1920 EXPORT_SYMBOL(km_policy_notify); 1921 EXPORT_SYMBOL(km_state_notify); 1922 1923 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1924 { 1925 struct km_event c; 1926 1927 c.data.hard = hard; 1928 c.portid = portid; 1929 c.event = XFRM_MSG_EXPIRE; 1930 km_state_notify(x, &c); 1931 } 1932 1933 EXPORT_SYMBOL(km_state_expired); 1934 /* 1935 * We send to all registered managers regardless of failure 1936 * We are happy with one success 1937 */ 1938 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1939 { 1940 int err = -EINVAL, acqret; 1941 struct xfrm_mgr *km; 1942 1943 rcu_read_lock(); 1944 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1945 acqret = km->acquire(x, t, pol); 1946 if (!acqret) 1947 err = acqret; 1948 } 1949 rcu_read_unlock(); 1950 return err; 1951 } 1952 EXPORT_SYMBOL(km_query); 1953 1954 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1955 { 1956 int err = -EINVAL; 1957 struct xfrm_mgr *km; 1958 1959 rcu_read_lock(); 1960 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1961 if (km->new_mapping) 1962 err = km->new_mapping(x, ipaddr, sport); 1963 if (!err) 1964 break; 1965 } 1966 rcu_read_unlock(); 1967 return err; 1968 } 1969 EXPORT_SYMBOL(km_new_mapping); 1970 1971 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1972 { 1973 struct km_event c; 1974 1975 c.data.hard = hard; 1976 c.portid = portid; 1977 c.event = XFRM_MSG_POLEXPIRE; 1978 km_policy_notify(pol, dir, &c); 1979 } 1980 EXPORT_SYMBOL(km_policy_expired); 1981 1982 #ifdef CONFIG_XFRM_MIGRATE 1983 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1984 const struct xfrm_migrate *m, int num_migrate, 1985 const struct xfrm_kmaddress *k, 1986 const struct xfrm_encap_tmpl *encap) 1987 { 1988 int err = -EINVAL; 1989 int ret; 1990 struct xfrm_mgr *km; 1991 1992 rcu_read_lock(); 1993 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1994 if (km->migrate) { 1995 ret = km->migrate(sel, dir, type, m, num_migrate, k, 1996 encap); 1997 if (!ret) 1998 err = ret; 1999 } 2000 } 2001 rcu_read_unlock(); 2002 return err; 2003 } 2004 EXPORT_SYMBOL(km_migrate); 2005 #endif 2006 2007 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 2008 { 2009 int err = -EINVAL; 2010 int ret; 2011 struct xfrm_mgr *km; 2012 2013 rcu_read_lock(); 2014 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2015 if (km->report) { 2016 ret = km->report(net, proto, sel, addr); 2017 if (!ret) 2018 err = ret; 2019 } 2020 } 2021 rcu_read_unlock(); 2022 return err; 2023 } 2024 EXPORT_SYMBOL(km_report); 2025 2026 bool km_is_alive(const struct km_event *c) 2027 { 2028 struct xfrm_mgr *km; 2029 bool is_alive = false; 2030 2031 rcu_read_lock(); 2032 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2033 if (km->is_alive && km->is_alive(c)) { 2034 is_alive = true; 2035 break; 2036 } 2037 } 2038 rcu_read_unlock(); 2039 2040 return is_alive; 2041 } 2042 EXPORT_SYMBOL(km_is_alive); 2043 2044 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 2045 { 2046 int err; 2047 u8 *data; 2048 struct xfrm_mgr *km; 2049 struct xfrm_policy *pol = NULL; 2050 2051 if (optlen <= 0 || optlen > PAGE_SIZE) 2052 return -EMSGSIZE; 2053 2054 data = memdup_user(optval, optlen); 2055 if (IS_ERR(data)) 2056 return PTR_ERR(data); 2057 2058 err = -EINVAL; 2059 rcu_read_lock(); 2060 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 2061 pol = km->compile_policy(sk, optname, data, 2062 optlen, &err); 2063 if (err >= 0) 2064 break; 2065 } 2066 rcu_read_unlock(); 2067 2068 if (err >= 0) { 2069 xfrm_sk_policy_insert(sk, err, pol); 2070 xfrm_pol_put(pol); 2071 __sk_dst_reset(sk); 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