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