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 DEFINE_SPINLOCK(xfrm_state_lock); 39 40 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 41 42 static inline unsigned int xfrm_dst_hash(struct net *net, 43 const xfrm_address_t *daddr, 44 const xfrm_address_t *saddr, 45 u32 reqid, 46 unsigned short family) 47 { 48 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 49 } 50 51 static inline unsigned int xfrm_src_hash(struct net *net, 52 const xfrm_address_t *daddr, 53 const xfrm_address_t *saddr, 54 unsigned short family) 55 { 56 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 57 } 58 59 static inline unsigned int 60 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 61 __be32 spi, u8 proto, unsigned short family) 62 { 63 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 64 } 65 66 static void xfrm_hash_transfer(struct hlist_head *list, 67 struct hlist_head *ndsttable, 68 struct hlist_head *nsrctable, 69 struct hlist_head *nspitable, 70 unsigned int nhashmask) 71 { 72 struct hlist_node *tmp; 73 struct xfrm_state *x; 74 75 hlist_for_each_entry_safe(x, tmp, list, bydst) { 76 unsigned int h; 77 78 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 79 x->props.reqid, x->props.family, 80 nhashmask); 81 hlist_add_head(&x->bydst, ndsttable+h); 82 83 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 84 x->props.family, 85 nhashmask); 86 hlist_add_head(&x->bysrc, nsrctable+h); 87 88 if (x->id.spi) { 89 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 90 x->id.proto, x->props.family, 91 nhashmask); 92 hlist_add_head(&x->byspi, nspitable+h); 93 } 94 } 95 } 96 97 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 98 { 99 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 100 } 101 102 static DEFINE_MUTEX(hash_resize_mutex); 103 104 static void xfrm_hash_resize(struct work_struct *work) 105 { 106 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 107 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 108 unsigned long nsize, osize; 109 unsigned int nhashmask, ohashmask; 110 int i; 111 112 mutex_lock(&hash_resize_mutex); 113 114 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 115 ndst = xfrm_hash_alloc(nsize); 116 if (!ndst) 117 goto out_unlock; 118 nsrc = xfrm_hash_alloc(nsize); 119 if (!nsrc) { 120 xfrm_hash_free(ndst, nsize); 121 goto out_unlock; 122 } 123 nspi = xfrm_hash_alloc(nsize); 124 if (!nspi) { 125 xfrm_hash_free(ndst, nsize); 126 xfrm_hash_free(nsrc, nsize); 127 goto out_unlock; 128 } 129 130 spin_lock_bh(&xfrm_state_lock); 131 132 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 133 for (i = net->xfrm.state_hmask; i >= 0; i--) 134 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, 135 nhashmask); 136 137 odst = net->xfrm.state_bydst; 138 osrc = net->xfrm.state_bysrc; 139 ospi = net->xfrm.state_byspi; 140 ohashmask = net->xfrm.state_hmask; 141 142 net->xfrm.state_bydst = ndst; 143 net->xfrm.state_bysrc = nsrc; 144 net->xfrm.state_byspi = nspi; 145 net->xfrm.state_hmask = nhashmask; 146 147 spin_unlock_bh(&xfrm_state_lock); 148 149 osize = (ohashmask + 1) * sizeof(struct hlist_head); 150 xfrm_hash_free(odst, osize); 151 xfrm_hash_free(osrc, osize); 152 xfrm_hash_free(ospi, osize); 153 154 out_unlock: 155 mutex_unlock(&hash_resize_mutex); 156 } 157 158 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 159 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 160 161 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 162 163 int __xfrm_state_delete(struct xfrm_state *x); 164 165 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 166 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 167 168 static DEFINE_SPINLOCK(xfrm_type_lock); 169 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 170 { 171 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 172 const struct xfrm_type **typemap; 173 int err = 0; 174 175 if (unlikely(afinfo == NULL)) 176 return -EAFNOSUPPORT; 177 typemap = afinfo->type_map; 178 spin_lock_bh(&xfrm_type_lock); 179 180 if (likely(typemap[type->proto] == NULL)) 181 typemap[type->proto] = type; 182 else 183 err = -EEXIST; 184 spin_unlock_bh(&xfrm_type_lock); 185 xfrm_state_put_afinfo(afinfo); 186 return err; 187 } 188 EXPORT_SYMBOL(xfrm_register_type); 189 190 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 191 { 192 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 193 const struct xfrm_type **typemap; 194 int err = 0; 195 196 if (unlikely(afinfo == NULL)) 197 return -EAFNOSUPPORT; 198 typemap = afinfo->type_map; 199 spin_lock_bh(&xfrm_type_lock); 200 201 if (unlikely(typemap[type->proto] != type)) 202 err = -ENOENT; 203 else 204 typemap[type->proto] = NULL; 205 spin_unlock_bh(&xfrm_type_lock); 206 xfrm_state_put_afinfo(afinfo); 207 return err; 208 } 209 EXPORT_SYMBOL(xfrm_unregister_type); 210 211 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 212 { 213 struct xfrm_state_afinfo *afinfo; 214 const struct xfrm_type **typemap; 215 const struct xfrm_type *type; 216 int modload_attempted = 0; 217 218 retry: 219 afinfo = xfrm_state_get_afinfo(family); 220 if (unlikely(afinfo == NULL)) 221 return NULL; 222 typemap = afinfo->type_map; 223 224 type = typemap[proto]; 225 if (unlikely(type && !try_module_get(type->owner))) 226 type = NULL; 227 if (!type && !modload_attempted) { 228 xfrm_state_put_afinfo(afinfo); 229 request_module("xfrm-type-%d-%d", family, proto); 230 modload_attempted = 1; 231 goto retry; 232 } 233 234 xfrm_state_put_afinfo(afinfo); 235 return type; 236 } 237 238 static void xfrm_put_type(const struct xfrm_type *type) 239 { 240 module_put(type->owner); 241 } 242 243 static DEFINE_SPINLOCK(xfrm_mode_lock); 244 int xfrm_register_mode(struct xfrm_mode *mode, int family) 245 { 246 struct xfrm_state_afinfo *afinfo; 247 struct xfrm_mode **modemap; 248 int err; 249 250 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 251 return -EINVAL; 252 253 afinfo = xfrm_state_get_afinfo(family); 254 if (unlikely(afinfo == NULL)) 255 return -EAFNOSUPPORT; 256 257 err = -EEXIST; 258 modemap = afinfo->mode_map; 259 spin_lock_bh(&xfrm_mode_lock); 260 if (modemap[mode->encap]) 261 goto out; 262 263 err = -ENOENT; 264 if (!try_module_get(afinfo->owner)) 265 goto out; 266 267 mode->afinfo = afinfo; 268 modemap[mode->encap] = mode; 269 err = 0; 270 271 out: 272 spin_unlock_bh(&xfrm_mode_lock); 273 xfrm_state_put_afinfo(afinfo); 274 return err; 275 } 276 EXPORT_SYMBOL(xfrm_register_mode); 277 278 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 279 { 280 struct xfrm_state_afinfo *afinfo; 281 struct xfrm_mode **modemap; 282 int err; 283 284 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 285 return -EINVAL; 286 287 afinfo = xfrm_state_get_afinfo(family); 288 if (unlikely(afinfo == NULL)) 289 return -EAFNOSUPPORT; 290 291 err = -ENOENT; 292 modemap = afinfo->mode_map; 293 spin_lock_bh(&xfrm_mode_lock); 294 if (likely(modemap[mode->encap] == mode)) { 295 modemap[mode->encap] = NULL; 296 module_put(mode->afinfo->owner); 297 err = 0; 298 } 299 300 spin_unlock_bh(&xfrm_mode_lock); 301 xfrm_state_put_afinfo(afinfo); 302 return err; 303 } 304 EXPORT_SYMBOL(xfrm_unregister_mode); 305 306 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 307 { 308 struct xfrm_state_afinfo *afinfo; 309 struct xfrm_mode *mode; 310 int modload_attempted = 0; 311 312 if (unlikely(encap >= XFRM_MODE_MAX)) 313 return NULL; 314 315 retry: 316 afinfo = xfrm_state_get_afinfo(family); 317 if (unlikely(afinfo == NULL)) 318 return NULL; 319 320 mode = afinfo->mode_map[encap]; 321 if (unlikely(mode && !try_module_get(mode->owner))) 322 mode = NULL; 323 if (!mode && !modload_attempted) { 324 xfrm_state_put_afinfo(afinfo); 325 request_module("xfrm-mode-%d-%d", family, encap); 326 modload_attempted = 1; 327 goto retry; 328 } 329 330 xfrm_state_put_afinfo(afinfo); 331 return mode; 332 } 333 334 static void xfrm_put_mode(struct xfrm_mode *mode) 335 { 336 module_put(mode->owner); 337 } 338 339 static void xfrm_state_gc_destroy(struct xfrm_state *x) 340 { 341 tasklet_hrtimer_cancel(&x->mtimer); 342 del_timer_sync(&x->rtimer); 343 kfree(x->aalg); 344 kfree(x->ealg); 345 kfree(x->calg); 346 kfree(x->encap); 347 kfree(x->coaddr); 348 kfree(x->replay_esn); 349 kfree(x->preplay_esn); 350 if (x->inner_mode) 351 xfrm_put_mode(x->inner_mode); 352 if (x->inner_mode_iaf) 353 xfrm_put_mode(x->inner_mode_iaf); 354 if (x->outer_mode) 355 xfrm_put_mode(x->outer_mode); 356 if (x->type) { 357 x->type->destructor(x); 358 xfrm_put_type(x->type); 359 } 360 security_xfrm_state_free(x); 361 kfree(x); 362 } 363 364 static void xfrm_state_gc_task(struct work_struct *work) 365 { 366 struct net *net = container_of(work, struct net, xfrm.state_gc_work); 367 struct xfrm_state *x; 368 struct hlist_node *tmp; 369 struct hlist_head gc_list; 370 371 spin_lock_bh(&xfrm_state_gc_lock); 372 hlist_move_list(&net->xfrm.state_gc_list, &gc_list); 373 spin_unlock_bh(&xfrm_state_gc_lock); 374 375 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 376 xfrm_state_gc_destroy(x); 377 378 wake_up(&net->xfrm.km_waitq); 379 } 380 381 static inline unsigned long make_jiffies(long secs) 382 { 383 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) 384 return MAX_SCHEDULE_TIMEOUT-1; 385 else 386 return secs*HZ; 387 } 388 389 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) 390 { 391 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 392 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 393 struct net *net = xs_net(x); 394 unsigned long now = get_seconds(); 395 long next = LONG_MAX; 396 int warn = 0; 397 int err = 0; 398 399 spin_lock(&x->lock); 400 if (x->km.state == XFRM_STATE_DEAD) 401 goto out; 402 if (x->km.state == XFRM_STATE_EXPIRED) 403 goto expired; 404 if (x->lft.hard_add_expires_seconds) { 405 long tmo = x->lft.hard_add_expires_seconds + 406 x->curlft.add_time - now; 407 if (tmo <= 0) { 408 if (x->xflags & XFRM_SOFT_EXPIRE) { 409 /* enter hard expire without soft expire first?! 410 * setting a new date could trigger this. 411 * workarbound: fix x->curflt.add_time by below: 412 */ 413 x->curlft.add_time = now - x->saved_tmo - 1; 414 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 415 } else 416 goto expired; 417 } 418 if (tmo < next) 419 next = tmo; 420 } 421 if (x->lft.hard_use_expires_seconds) { 422 long tmo = x->lft.hard_use_expires_seconds + 423 (x->curlft.use_time ? : now) - now; 424 if (tmo <= 0) 425 goto expired; 426 if (tmo < next) 427 next = tmo; 428 } 429 if (x->km.dying) 430 goto resched; 431 if (x->lft.soft_add_expires_seconds) { 432 long tmo = x->lft.soft_add_expires_seconds + 433 x->curlft.add_time - now; 434 if (tmo <= 0) { 435 warn = 1; 436 x->xflags &= ~XFRM_SOFT_EXPIRE; 437 } else if (tmo < next) { 438 next = tmo; 439 x->xflags |= XFRM_SOFT_EXPIRE; 440 x->saved_tmo = tmo; 441 } 442 } 443 if (x->lft.soft_use_expires_seconds) { 444 long tmo = x->lft.soft_use_expires_seconds + 445 (x->curlft.use_time ? : now) - now; 446 if (tmo <= 0) 447 warn = 1; 448 else if (tmo < next) 449 next = tmo; 450 } 451 452 x->km.dying = warn; 453 if (warn) 454 km_state_expired(x, 0, 0); 455 resched: 456 if (next != LONG_MAX){ 457 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 458 } 459 460 goto out; 461 462 expired: 463 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { 464 x->km.state = XFRM_STATE_EXPIRED; 465 wake_up(&net->xfrm.km_waitq); 466 next = 2; 467 goto resched; 468 } 469 470 err = __xfrm_state_delete(x); 471 if (!err) 472 km_state_expired(x, 1, 0); 473 474 xfrm_audit_state_delete(x, err ? 0 : 1, 475 audit_get_loginuid(current), 476 audit_get_sessionid(current), 0); 477 478 out: 479 spin_unlock(&x->lock); 480 return HRTIMER_NORESTART; 481 } 482 483 static void xfrm_replay_timer_handler(unsigned long data); 484 485 struct xfrm_state *xfrm_state_alloc(struct net *net) 486 { 487 struct xfrm_state *x; 488 489 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 490 491 if (x) { 492 write_pnet(&x->xs_net, net); 493 atomic_set(&x->refcnt, 1); 494 atomic_set(&x->tunnel_users, 0); 495 INIT_LIST_HEAD(&x->km.all); 496 INIT_HLIST_NODE(&x->bydst); 497 INIT_HLIST_NODE(&x->bysrc); 498 INIT_HLIST_NODE(&x->byspi); 499 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, 500 CLOCK_BOOTTIME, HRTIMER_MODE_ABS); 501 setup_timer(&x->rtimer, xfrm_replay_timer_handler, 502 (unsigned long)x); 503 x->curlft.add_time = get_seconds(); 504 x->lft.soft_byte_limit = XFRM_INF; 505 x->lft.soft_packet_limit = XFRM_INF; 506 x->lft.hard_byte_limit = XFRM_INF; 507 x->lft.hard_packet_limit = XFRM_INF; 508 x->replay_maxage = 0; 509 x->replay_maxdiff = 0; 510 x->inner_mode = NULL; 511 x->inner_mode_iaf = NULL; 512 spin_lock_init(&x->lock); 513 } 514 return x; 515 } 516 EXPORT_SYMBOL(xfrm_state_alloc); 517 518 void __xfrm_state_destroy(struct xfrm_state *x) 519 { 520 struct net *net = xs_net(x); 521 522 WARN_ON(x->km.state != XFRM_STATE_DEAD); 523 524 spin_lock_bh(&xfrm_state_gc_lock); 525 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); 526 spin_unlock_bh(&xfrm_state_gc_lock); 527 schedule_work(&net->xfrm.state_gc_work); 528 } 529 EXPORT_SYMBOL(__xfrm_state_destroy); 530 531 int __xfrm_state_delete(struct xfrm_state *x) 532 { 533 struct net *net = xs_net(x); 534 int err = -ESRCH; 535 536 if (x->km.state != XFRM_STATE_DEAD) { 537 x->km.state = XFRM_STATE_DEAD; 538 spin_lock(&xfrm_state_lock); 539 list_del(&x->km.all); 540 hlist_del(&x->bydst); 541 hlist_del(&x->bysrc); 542 if (x->id.spi) 543 hlist_del(&x->byspi); 544 net->xfrm.state_num--; 545 spin_unlock(&xfrm_state_lock); 546 547 /* All xfrm_state objects are created by xfrm_state_alloc. 548 * The xfrm_state_alloc call gives a reference, and that 549 * is what we are dropping here. 550 */ 551 xfrm_state_put(x); 552 err = 0; 553 } 554 555 return err; 556 } 557 EXPORT_SYMBOL(__xfrm_state_delete); 558 559 int xfrm_state_delete(struct xfrm_state *x) 560 { 561 int err; 562 563 spin_lock_bh(&x->lock); 564 err = __xfrm_state_delete(x); 565 spin_unlock_bh(&x->lock); 566 567 return err; 568 } 569 EXPORT_SYMBOL(xfrm_state_delete); 570 571 #ifdef CONFIG_SECURITY_NETWORK_XFRM 572 static inline int 573 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 574 { 575 int i, err = 0; 576 577 for (i = 0; i <= net->xfrm.state_hmask; i++) { 578 struct xfrm_state *x; 579 580 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 581 if (xfrm_id_proto_match(x->id.proto, proto) && 582 (err = security_xfrm_state_delete(x)) != 0) { 583 xfrm_audit_state_delete(x, 0, 584 audit_info->loginuid, 585 audit_info->sessionid, 586 audit_info->secid); 587 return err; 588 } 589 } 590 } 591 592 return err; 593 } 594 #else 595 static inline int 596 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 597 { 598 return 0; 599 } 600 #endif 601 602 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) 603 { 604 int i, err = 0, cnt = 0; 605 606 spin_lock_bh(&xfrm_state_lock); 607 err = xfrm_state_flush_secctx_check(net, proto, audit_info); 608 if (err) 609 goto out; 610 611 err = -ESRCH; 612 for (i = 0; i <= net->xfrm.state_hmask; i++) { 613 struct xfrm_state *x; 614 restart: 615 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 616 if (!xfrm_state_kern(x) && 617 xfrm_id_proto_match(x->id.proto, proto)) { 618 xfrm_state_hold(x); 619 spin_unlock_bh(&xfrm_state_lock); 620 621 err = xfrm_state_delete(x); 622 xfrm_audit_state_delete(x, err ? 0 : 1, 623 audit_info->loginuid, 624 audit_info->sessionid, 625 audit_info->secid); 626 xfrm_state_put(x); 627 if (!err) 628 cnt++; 629 630 spin_lock_bh(&xfrm_state_lock); 631 goto restart; 632 } 633 } 634 } 635 if (cnt) 636 err = 0; 637 638 out: 639 spin_unlock_bh(&xfrm_state_lock); 640 wake_up(&net->xfrm.km_waitq); 641 return err; 642 } 643 EXPORT_SYMBOL(xfrm_state_flush); 644 645 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 646 { 647 spin_lock_bh(&xfrm_state_lock); 648 si->sadcnt = net->xfrm.state_num; 649 si->sadhcnt = net->xfrm.state_hmask; 650 si->sadhmcnt = xfrm_state_hashmax; 651 spin_unlock_bh(&xfrm_state_lock); 652 } 653 EXPORT_SYMBOL(xfrm_sad_getinfo); 654 655 static int 656 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 657 const struct xfrm_tmpl *tmpl, 658 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 659 unsigned short family) 660 { 661 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 662 if (!afinfo) 663 return -1; 664 afinfo->init_tempsel(&x->sel, fl); 665 666 if (family != tmpl->encap_family) { 667 xfrm_state_put_afinfo(afinfo); 668 afinfo = xfrm_state_get_afinfo(tmpl->encap_family); 669 if (!afinfo) 670 return -1; 671 } 672 afinfo->init_temprop(x, tmpl, daddr, saddr); 673 xfrm_state_put_afinfo(afinfo); 674 return 0; 675 } 676 677 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 678 const xfrm_address_t *daddr, 679 __be32 spi, u8 proto, 680 unsigned short family) 681 { 682 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 683 struct xfrm_state *x; 684 685 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) { 686 if (x->props.family != family || 687 x->id.spi != spi || 688 x->id.proto != proto || 689 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 690 continue; 691 692 if ((mark & x->mark.m) != x->mark.v) 693 continue; 694 xfrm_state_hold(x); 695 return x; 696 } 697 698 return NULL; 699 } 700 701 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 702 const xfrm_address_t *daddr, 703 const xfrm_address_t *saddr, 704 u8 proto, unsigned short family) 705 { 706 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 707 struct xfrm_state *x; 708 709 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 710 if (x->props.family != family || 711 x->id.proto != proto || 712 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 713 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 714 continue; 715 716 if ((mark & x->mark.m) != x->mark.v) 717 continue; 718 xfrm_state_hold(x); 719 return x; 720 } 721 722 return NULL; 723 } 724 725 static inline struct xfrm_state * 726 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 727 { 728 struct net *net = xs_net(x); 729 u32 mark = x->mark.v & x->mark.m; 730 731 if (use_spi) 732 return __xfrm_state_lookup(net, mark, &x->id.daddr, 733 x->id.spi, x->id.proto, family); 734 else 735 return __xfrm_state_lookup_byaddr(net, mark, 736 &x->id.daddr, 737 &x->props.saddr, 738 x->id.proto, family); 739 } 740 741 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 742 { 743 if (have_hash_collision && 744 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 745 net->xfrm.state_num > net->xfrm.state_hmask) 746 schedule_work(&net->xfrm.state_hash_work); 747 } 748 749 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 750 const struct flowi *fl, unsigned short family, 751 struct xfrm_state **best, int *acq_in_progress, 752 int *error) 753 { 754 /* Resolution logic: 755 * 1. There is a valid state with matching selector. Done. 756 * 2. Valid state with inappropriate selector. Skip. 757 * 758 * Entering area of "sysdeps". 759 * 760 * 3. If state is not valid, selector is temporary, it selects 761 * only session which triggered previous resolution. Key 762 * manager will do something to install a state with proper 763 * selector. 764 */ 765 if (x->km.state == XFRM_STATE_VALID) { 766 if ((x->sel.family && 767 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 768 !security_xfrm_state_pol_flow_match(x, pol, fl)) 769 return; 770 771 if (!*best || 772 (*best)->km.dying > x->km.dying || 773 ((*best)->km.dying == x->km.dying && 774 (*best)->curlft.add_time < x->curlft.add_time)) 775 *best = x; 776 } else if (x->km.state == XFRM_STATE_ACQ) { 777 *acq_in_progress = 1; 778 } else if (x->km.state == XFRM_STATE_ERROR || 779 x->km.state == XFRM_STATE_EXPIRED) { 780 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 781 security_xfrm_state_pol_flow_match(x, pol, fl)) 782 *error = -ESRCH; 783 } 784 } 785 786 struct xfrm_state * 787 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 788 const struct flowi *fl, struct xfrm_tmpl *tmpl, 789 struct xfrm_policy *pol, int *err, 790 unsigned short family) 791 { 792 static xfrm_address_t saddr_wildcard = { }; 793 struct net *net = xp_net(pol); 794 unsigned int h, h_wildcard; 795 struct xfrm_state *x, *x0, *to_put; 796 int acquire_in_progress = 0; 797 int error = 0; 798 struct xfrm_state *best = NULL; 799 u32 mark = pol->mark.v & pol->mark.m; 800 unsigned short encap_family = tmpl->encap_family; 801 802 to_put = NULL; 803 804 spin_lock_bh(&xfrm_state_lock); 805 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 806 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 807 if (x->props.family == encap_family && 808 x->props.reqid == tmpl->reqid && 809 (mark & x->mark.m) == x->mark.v && 810 !(x->props.flags & XFRM_STATE_WILDRECV) && 811 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 812 tmpl->mode == x->props.mode && 813 tmpl->id.proto == x->id.proto && 814 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 815 xfrm_state_look_at(pol, x, fl, encap_family, 816 &best, &acquire_in_progress, &error); 817 } 818 if (best || acquire_in_progress) 819 goto found; 820 821 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 822 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) { 823 if (x->props.family == encap_family && 824 x->props.reqid == tmpl->reqid && 825 (mark & x->mark.m) == x->mark.v && 826 !(x->props.flags & XFRM_STATE_WILDRECV) && 827 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 828 tmpl->mode == x->props.mode && 829 tmpl->id.proto == x->id.proto && 830 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 831 xfrm_state_look_at(pol, x, fl, encap_family, 832 &best, &acquire_in_progress, &error); 833 } 834 835 found: 836 x = best; 837 if (!x && !error && !acquire_in_progress) { 838 if (tmpl->id.spi && 839 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 840 tmpl->id.proto, encap_family)) != NULL) { 841 to_put = x0; 842 error = -EEXIST; 843 goto out; 844 } 845 x = xfrm_state_alloc(net); 846 if (x == NULL) { 847 error = -ENOMEM; 848 goto out; 849 } 850 /* Initialize temporary state matching only 851 * to current session. */ 852 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 853 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 854 855 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 856 if (error) { 857 x->km.state = XFRM_STATE_DEAD; 858 to_put = x; 859 x = NULL; 860 goto out; 861 } 862 863 if (km_query(x, tmpl, pol) == 0) { 864 x->km.state = XFRM_STATE_ACQ; 865 list_add(&x->km.all, &net->xfrm.state_all); 866 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 867 h = xfrm_src_hash(net, daddr, saddr, encap_family); 868 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 869 if (x->id.spi) { 870 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 871 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 872 } 873 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 874 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 875 net->xfrm.state_num++; 876 xfrm_hash_grow_check(net, x->bydst.next != NULL); 877 } else { 878 x->km.state = XFRM_STATE_DEAD; 879 to_put = x; 880 x = NULL; 881 error = -ESRCH; 882 } 883 } 884 out: 885 if (x) 886 xfrm_state_hold(x); 887 else 888 *err = acquire_in_progress ? -EAGAIN : error; 889 spin_unlock_bh(&xfrm_state_lock); 890 if (to_put) 891 xfrm_state_put(to_put); 892 return x; 893 } 894 895 struct xfrm_state * 896 xfrm_stateonly_find(struct net *net, u32 mark, 897 xfrm_address_t *daddr, xfrm_address_t *saddr, 898 unsigned short family, u8 mode, u8 proto, u32 reqid) 899 { 900 unsigned int h; 901 struct xfrm_state *rx = NULL, *x = NULL; 902 903 spin_lock(&xfrm_state_lock); 904 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 905 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 906 if (x->props.family == family && 907 x->props.reqid == reqid && 908 (mark & x->mark.m) == x->mark.v && 909 !(x->props.flags & XFRM_STATE_WILDRECV) && 910 xfrm_state_addr_check(x, daddr, saddr, family) && 911 mode == x->props.mode && 912 proto == x->id.proto && 913 x->km.state == XFRM_STATE_VALID) { 914 rx = x; 915 break; 916 } 917 } 918 919 if (rx) 920 xfrm_state_hold(rx); 921 spin_unlock(&xfrm_state_lock); 922 923 924 return rx; 925 } 926 EXPORT_SYMBOL(xfrm_stateonly_find); 927 928 static void __xfrm_state_insert(struct xfrm_state *x) 929 { 930 struct net *net = xs_net(x); 931 unsigned int h; 932 933 list_add(&x->km.all, &net->xfrm.state_all); 934 935 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 936 x->props.reqid, x->props.family); 937 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 938 939 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 940 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 941 942 if (x->id.spi) { 943 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 944 x->props.family); 945 946 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 947 } 948 949 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 950 if (x->replay_maxage) 951 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 952 953 wake_up(&net->xfrm.km_waitq); 954 955 net->xfrm.state_num++; 956 957 xfrm_hash_grow_check(net, x->bydst.next != NULL); 958 } 959 960 /* xfrm_state_lock is held */ 961 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 962 { 963 struct net *net = xs_net(xnew); 964 unsigned short family = xnew->props.family; 965 u32 reqid = xnew->props.reqid; 966 struct xfrm_state *x; 967 unsigned int h; 968 u32 mark = xnew->mark.v & xnew->mark.m; 969 970 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 971 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 972 if (x->props.family == family && 973 x->props.reqid == reqid && 974 (mark & x->mark.m) == x->mark.v && 975 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 976 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 977 x->genid++; 978 } 979 } 980 981 void xfrm_state_insert(struct xfrm_state *x) 982 { 983 spin_lock_bh(&xfrm_state_lock); 984 __xfrm_state_bump_genids(x); 985 __xfrm_state_insert(x); 986 spin_unlock_bh(&xfrm_state_lock); 987 } 988 EXPORT_SYMBOL(xfrm_state_insert); 989 990 /* xfrm_state_lock is held */ 991 static struct xfrm_state *__find_acq_core(struct net *net, 992 const struct xfrm_mark *m, 993 unsigned short family, u8 mode, 994 u32 reqid, u8 proto, 995 const xfrm_address_t *daddr, 996 const xfrm_address_t *saddr, 997 int create) 998 { 999 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1000 struct xfrm_state *x; 1001 u32 mark = m->v & m->m; 1002 1003 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1004 if (x->props.reqid != reqid || 1005 x->props.mode != mode || 1006 x->props.family != family || 1007 x->km.state != XFRM_STATE_ACQ || 1008 x->id.spi != 0 || 1009 x->id.proto != proto || 1010 (mark & x->mark.m) != x->mark.v || 1011 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1012 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1013 continue; 1014 1015 xfrm_state_hold(x); 1016 return x; 1017 } 1018 1019 if (!create) 1020 return NULL; 1021 1022 x = xfrm_state_alloc(net); 1023 if (likely(x)) { 1024 switch (family) { 1025 case AF_INET: 1026 x->sel.daddr.a4 = daddr->a4; 1027 x->sel.saddr.a4 = saddr->a4; 1028 x->sel.prefixlen_d = 32; 1029 x->sel.prefixlen_s = 32; 1030 x->props.saddr.a4 = saddr->a4; 1031 x->id.daddr.a4 = daddr->a4; 1032 break; 1033 1034 case AF_INET6: 1035 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr; 1036 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr; 1037 x->sel.prefixlen_d = 128; 1038 x->sel.prefixlen_s = 128; 1039 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr; 1040 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr; 1041 break; 1042 } 1043 1044 x->km.state = XFRM_STATE_ACQ; 1045 x->id.proto = proto; 1046 x->props.family = family; 1047 x->props.mode = mode; 1048 x->props.reqid = reqid; 1049 x->mark.v = m->v; 1050 x->mark.m = m->m; 1051 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1052 xfrm_state_hold(x); 1053 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1054 list_add(&x->km.all, &net->xfrm.state_all); 1055 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 1056 h = xfrm_src_hash(net, daddr, saddr, family); 1057 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 1058 1059 net->xfrm.state_num++; 1060 1061 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1062 } 1063 1064 return x; 1065 } 1066 1067 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1068 1069 int xfrm_state_add(struct xfrm_state *x) 1070 { 1071 struct net *net = xs_net(x); 1072 struct xfrm_state *x1, *to_put; 1073 int family; 1074 int err; 1075 u32 mark = x->mark.v & x->mark.m; 1076 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1077 1078 family = x->props.family; 1079 1080 to_put = NULL; 1081 1082 spin_lock_bh(&xfrm_state_lock); 1083 1084 x1 = __xfrm_state_locate(x, use_spi, family); 1085 if (x1) { 1086 to_put = x1; 1087 x1 = NULL; 1088 err = -EEXIST; 1089 goto out; 1090 } 1091 1092 if (use_spi && x->km.seq) { 1093 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1094 if (x1 && ((x1->id.proto != x->id.proto) || 1095 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1096 to_put = x1; 1097 x1 = NULL; 1098 } 1099 } 1100 1101 if (use_spi && !x1) 1102 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1103 x->props.reqid, x->id.proto, 1104 &x->id.daddr, &x->props.saddr, 0); 1105 1106 __xfrm_state_bump_genids(x); 1107 __xfrm_state_insert(x); 1108 err = 0; 1109 1110 out: 1111 spin_unlock_bh(&xfrm_state_lock); 1112 1113 if (x1) { 1114 xfrm_state_delete(x1); 1115 xfrm_state_put(x1); 1116 } 1117 1118 if (to_put) 1119 xfrm_state_put(to_put); 1120 1121 return err; 1122 } 1123 EXPORT_SYMBOL(xfrm_state_add); 1124 1125 #ifdef CONFIG_XFRM_MIGRATE 1126 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) 1127 { 1128 struct net *net = xs_net(orig); 1129 int err = -ENOMEM; 1130 struct xfrm_state *x = xfrm_state_alloc(net); 1131 if (!x) 1132 goto out; 1133 1134 memcpy(&x->id, &orig->id, sizeof(x->id)); 1135 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1136 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1137 x->props.mode = orig->props.mode; 1138 x->props.replay_window = orig->props.replay_window; 1139 x->props.reqid = orig->props.reqid; 1140 x->props.family = orig->props.family; 1141 x->props.saddr = orig->props.saddr; 1142 1143 if (orig->aalg) { 1144 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1145 if (!x->aalg) 1146 goto error; 1147 } 1148 x->props.aalgo = orig->props.aalgo; 1149 1150 if (orig->ealg) { 1151 x->ealg = xfrm_algo_clone(orig->ealg); 1152 if (!x->ealg) 1153 goto error; 1154 } 1155 x->props.ealgo = orig->props.ealgo; 1156 1157 if (orig->calg) { 1158 x->calg = xfrm_algo_clone(orig->calg); 1159 if (!x->calg) 1160 goto error; 1161 } 1162 x->props.calgo = orig->props.calgo; 1163 1164 if (orig->encap) { 1165 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); 1166 if (!x->encap) 1167 goto error; 1168 } 1169 1170 if (orig->coaddr) { 1171 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1172 GFP_KERNEL); 1173 if (!x->coaddr) 1174 goto error; 1175 } 1176 1177 if (orig->replay_esn) { 1178 err = xfrm_replay_clone(x, orig); 1179 if (err) 1180 goto error; 1181 } 1182 1183 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1184 1185 err = xfrm_init_state(x); 1186 if (err) 1187 goto error; 1188 1189 x->props.flags = orig->props.flags; 1190 x->props.extra_flags = orig->props.extra_flags; 1191 1192 x->curlft.add_time = orig->curlft.add_time; 1193 x->km.state = orig->km.state; 1194 x->km.seq = orig->km.seq; 1195 1196 return x; 1197 1198 error: 1199 xfrm_state_put(x); 1200 out: 1201 if (errp) 1202 *errp = err; 1203 return NULL; 1204 } 1205 1206 /* xfrm_state_lock is held */ 1207 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) 1208 { 1209 unsigned int h; 1210 struct xfrm_state *x; 1211 1212 if (m->reqid) { 1213 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, 1214 m->reqid, m->old_family); 1215 hlist_for_each_entry(x, init_net.xfrm.state_bydst+h, bydst) { 1216 if (x->props.mode != m->mode || 1217 x->id.proto != m->proto) 1218 continue; 1219 if (m->reqid && x->props.reqid != m->reqid) 1220 continue; 1221 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1222 m->old_family) || 1223 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1224 m->old_family)) 1225 continue; 1226 xfrm_state_hold(x); 1227 return x; 1228 } 1229 } else { 1230 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, 1231 m->old_family); 1232 hlist_for_each_entry(x, init_net.xfrm.state_bysrc+h, bysrc) { 1233 if (x->props.mode != m->mode || 1234 x->id.proto != m->proto) 1235 continue; 1236 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1237 m->old_family) || 1238 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1239 m->old_family)) 1240 continue; 1241 xfrm_state_hold(x); 1242 return x; 1243 } 1244 } 1245 1246 return NULL; 1247 } 1248 EXPORT_SYMBOL(xfrm_migrate_state_find); 1249 1250 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1251 struct xfrm_migrate *m) 1252 { 1253 struct xfrm_state *xc; 1254 int err; 1255 1256 xc = xfrm_state_clone(x, &err); 1257 if (!xc) 1258 return NULL; 1259 1260 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1261 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1262 1263 /* add state */ 1264 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1265 /* a care is needed when the destination address of the 1266 state is to be updated as it is a part of triplet */ 1267 xfrm_state_insert(xc); 1268 } else { 1269 if ((err = xfrm_state_add(xc)) < 0) 1270 goto error; 1271 } 1272 1273 return xc; 1274 error: 1275 xfrm_state_put(xc); 1276 return NULL; 1277 } 1278 EXPORT_SYMBOL(xfrm_state_migrate); 1279 #endif 1280 1281 int xfrm_state_update(struct xfrm_state *x) 1282 { 1283 struct xfrm_state *x1, *to_put; 1284 int err; 1285 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1286 1287 to_put = NULL; 1288 1289 spin_lock_bh(&xfrm_state_lock); 1290 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1291 1292 err = -ESRCH; 1293 if (!x1) 1294 goto out; 1295 1296 if (xfrm_state_kern(x1)) { 1297 to_put = x1; 1298 err = -EEXIST; 1299 goto out; 1300 } 1301 1302 if (x1->km.state == XFRM_STATE_ACQ) { 1303 __xfrm_state_insert(x); 1304 x = NULL; 1305 } 1306 err = 0; 1307 1308 out: 1309 spin_unlock_bh(&xfrm_state_lock); 1310 1311 if (to_put) 1312 xfrm_state_put(to_put); 1313 1314 if (err) 1315 return err; 1316 1317 if (!x) { 1318 xfrm_state_delete(x1); 1319 xfrm_state_put(x1); 1320 return 0; 1321 } 1322 1323 err = -EINVAL; 1324 spin_lock_bh(&x1->lock); 1325 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1326 if (x->encap && x1->encap) 1327 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1328 if (x->coaddr && x1->coaddr) { 1329 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1330 } 1331 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1332 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1333 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1334 x1->km.dying = 0; 1335 1336 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1337 if (x1->curlft.use_time) 1338 xfrm_state_check_expire(x1); 1339 1340 err = 0; 1341 x->km.state = XFRM_STATE_DEAD; 1342 __xfrm_state_put(x); 1343 } 1344 spin_unlock_bh(&x1->lock); 1345 1346 xfrm_state_put(x1); 1347 1348 return err; 1349 } 1350 EXPORT_SYMBOL(xfrm_state_update); 1351 1352 int xfrm_state_check_expire(struct xfrm_state *x) 1353 { 1354 if (!x->curlft.use_time) 1355 x->curlft.use_time = get_seconds(); 1356 1357 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1358 x->curlft.packets >= x->lft.hard_packet_limit) { 1359 x->km.state = XFRM_STATE_EXPIRED; 1360 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); 1361 return -EINVAL; 1362 } 1363 1364 if (!x->km.dying && 1365 (x->curlft.bytes >= x->lft.soft_byte_limit || 1366 x->curlft.packets >= x->lft.soft_packet_limit)) { 1367 x->km.dying = 1; 1368 km_state_expired(x, 0, 0); 1369 } 1370 return 0; 1371 } 1372 EXPORT_SYMBOL(xfrm_state_check_expire); 1373 1374 struct xfrm_state * 1375 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1376 u8 proto, unsigned short family) 1377 { 1378 struct xfrm_state *x; 1379 1380 spin_lock_bh(&xfrm_state_lock); 1381 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1382 spin_unlock_bh(&xfrm_state_lock); 1383 return x; 1384 } 1385 EXPORT_SYMBOL(xfrm_state_lookup); 1386 1387 struct xfrm_state * 1388 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1389 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1390 u8 proto, unsigned short family) 1391 { 1392 struct xfrm_state *x; 1393 1394 spin_lock_bh(&xfrm_state_lock); 1395 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1396 spin_unlock_bh(&xfrm_state_lock); 1397 return x; 1398 } 1399 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1400 1401 struct xfrm_state * 1402 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1403 u8 proto, const xfrm_address_t *daddr, 1404 const xfrm_address_t *saddr, int create, unsigned short family) 1405 { 1406 struct xfrm_state *x; 1407 1408 spin_lock_bh(&xfrm_state_lock); 1409 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1410 spin_unlock_bh(&xfrm_state_lock); 1411 1412 return x; 1413 } 1414 EXPORT_SYMBOL(xfrm_find_acq); 1415 1416 #ifdef CONFIG_XFRM_SUB_POLICY 1417 int 1418 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1419 unsigned short family) 1420 { 1421 int err = 0; 1422 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1423 if (!afinfo) 1424 return -EAFNOSUPPORT; 1425 1426 spin_lock_bh(&xfrm_state_lock); 1427 if (afinfo->tmpl_sort) 1428 err = afinfo->tmpl_sort(dst, src, n); 1429 spin_unlock_bh(&xfrm_state_lock); 1430 xfrm_state_put_afinfo(afinfo); 1431 return err; 1432 } 1433 EXPORT_SYMBOL(xfrm_tmpl_sort); 1434 1435 int 1436 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1437 unsigned short family) 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(&xfrm_state_lock); 1445 if (afinfo->state_sort) 1446 err = afinfo->state_sort(dst, src, n); 1447 spin_unlock_bh(&xfrm_state_lock); 1448 xfrm_state_put_afinfo(afinfo); 1449 return err; 1450 } 1451 EXPORT_SYMBOL(xfrm_state_sort); 1452 #endif 1453 1454 /* Silly enough, but I'm lazy to build resolution list */ 1455 1456 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1457 { 1458 int i; 1459 1460 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1461 struct xfrm_state *x; 1462 1463 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1464 if (x->km.seq == seq && 1465 (mark & x->mark.m) == x->mark.v && 1466 x->km.state == XFRM_STATE_ACQ) { 1467 xfrm_state_hold(x); 1468 return x; 1469 } 1470 } 1471 } 1472 return NULL; 1473 } 1474 1475 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1476 { 1477 struct xfrm_state *x; 1478 1479 spin_lock_bh(&xfrm_state_lock); 1480 x = __xfrm_find_acq_byseq(net, mark, seq); 1481 spin_unlock_bh(&xfrm_state_lock); 1482 return x; 1483 } 1484 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1485 1486 u32 xfrm_get_acqseq(void) 1487 { 1488 u32 res; 1489 static atomic_t acqseq; 1490 1491 do { 1492 res = atomic_inc_return(&acqseq); 1493 } while (!res); 1494 1495 return res; 1496 } 1497 EXPORT_SYMBOL(xfrm_get_acqseq); 1498 1499 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1500 { 1501 struct net *net = xs_net(x); 1502 unsigned int h; 1503 struct xfrm_state *x0; 1504 int err = -ENOENT; 1505 __be32 minspi = htonl(low); 1506 __be32 maxspi = htonl(high); 1507 u32 mark = x->mark.v & x->mark.m; 1508 1509 spin_lock_bh(&x->lock); 1510 if (x->km.state == XFRM_STATE_DEAD) 1511 goto unlock; 1512 1513 err = 0; 1514 if (x->id.spi) 1515 goto unlock; 1516 1517 err = -ENOENT; 1518 1519 if (minspi == maxspi) { 1520 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1521 if (x0) { 1522 xfrm_state_put(x0); 1523 goto unlock; 1524 } 1525 x->id.spi = minspi; 1526 } else { 1527 u32 spi = 0; 1528 for (h=0; h<high-low+1; h++) { 1529 spi = low + net_random()%(high-low+1); 1530 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1531 if (x0 == NULL) { 1532 x->id.spi = htonl(spi); 1533 break; 1534 } 1535 xfrm_state_put(x0); 1536 } 1537 } 1538 if (x->id.spi) { 1539 spin_lock_bh(&xfrm_state_lock); 1540 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1541 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 1542 spin_unlock_bh(&xfrm_state_lock); 1543 1544 err = 0; 1545 } 1546 1547 unlock: 1548 spin_unlock_bh(&x->lock); 1549 1550 return err; 1551 } 1552 EXPORT_SYMBOL(xfrm_alloc_spi); 1553 1554 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1555 int (*func)(struct xfrm_state *, int, void*), 1556 void *data) 1557 { 1558 struct xfrm_state *state; 1559 struct xfrm_state_walk *x; 1560 int err = 0; 1561 1562 if (walk->seq != 0 && list_empty(&walk->all)) 1563 return 0; 1564 1565 spin_lock_bh(&xfrm_state_lock); 1566 if (list_empty(&walk->all)) 1567 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1568 else 1569 x = list_entry(&walk->all, struct xfrm_state_walk, all); 1570 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1571 if (x->state == XFRM_STATE_DEAD) 1572 continue; 1573 state = container_of(x, struct xfrm_state, km); 1574 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1575 continue; 1576 err = func(state, walk->seq, data); 1577 if (err) { 1578 list_move_tail(&walk->all, &x->all); 1579 goto out; 1580 } 1581 walk->seq++; 1582 } 1583 if (walk->seq == 0) { 1584 err = -ENOENT; 1585 goto out; 1586 } 1587 list_del_init(&walk->all); 1588 out: 1589 spin_unlock_bh(&xfrm_state_lock); 1590 return err; 1591 } 1592 EXPORT_SYMBOL(xfrm_state_walk); 1593 1594 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1595 { 1596 INIT_LIST_HEAD(&walk->all); 1597 walk->proto = proto; 1598 walk->state = XFRM_STATE_DEAD; 1599 walk->seq = 0; 1600 } 1601 EXPORT_SYMBOL(xfrm_state_walk_init); 1602 1603 void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1604 { 1605 if (list_empty(&walk->all)) 1606 return; 1607 1608 spin_lock_bh(&xfrm_state_lock); 1609 list_del(&walk->all); 1610 spin_unlock_bh(&xfrm_state_lock); 1611 } 1612 EXPORT_SYMBOL(xfrm_state_walk_done); 1613 1614 static void xfrm_replay_timer_handler(unsigned long data) 1615 { 1616 struct xfrm_state *x = (struct xfrm_state*)data; 1617 1618 spin_lock(&x->lock); 1619 1620 if (x->km.state == XFRM_STATE_VALID) { 1621 if (xfrm_aevent_is_on(xs_net(x))) 1622 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1623 else 1624 x->xflags |= XFRM_TIME_DEFER; 1625 } 1626 1627 spin_unlock(&x->lock); 1628 } 1629 1630 static LIST_HEAD(xfrm_km_list); 1631 1632 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1633 { 1634 struct xfrm_mgr *km; 1635 1636 rcu_read_lock(); 1637 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1638 if (km->notify_policy) 1639 km->notify_policy(xp, dir, c); 1640 rcu_read_unlock(); 1641 } 1642 1643 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1644 { 1645 struct xfrm_mgr *km; 1646 rcu_read_lock(); 1647 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1648 if (km->notify) 1649 km->notify(x, c); 1650 rcu_read_unlock(); 1651 } 1652 1653 EXPORT_SYMBOL(km_policy_notify); 1654 EXPORT_SYMBOL(km_state_notify); 1655 1656 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1657 { 1658 struct net *net = xs_net(x); 1659 struct km_event c; 1660 1661 c.data.hard = hard; 1662 c.portid = portid; 1663 c.event = XFRM_MSG_EXPIRE; 1664 km_state_notify(x, &c); 1665 1666 if (hard) 1667 wake_up(&net->xfrm.km_waitq); 1668 } 1669 1670 EXPORT_SYMBOL(km_state_expired); 1671 /* 1672 * We send to all registered managers regardless of failure 1673 * We are happy with one success 1674 */ 1675 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1676 { 1677 int err = -EINVAL, acqret; 1678 struct xfrm_mgr *km; 1679 1680 rcu_read_lock(); 1681 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1682 acqret = km->acquire(x, t, pol); 1683 if (!acqret) 1684 err = acqret; 1685 } 1686 rcu_read_unlock(); 1687 return err; 1688 } 1689 EXPORT_SYMBOL(km_query); 1690 1691 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1692 { 1693 int err = -EINVAL; 1694 struct xfrm_mgr *km; 1695 1696 rcu_read_lock(); 1697 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1698 if (km->new_mapping) 1699 err = km->new_mapping(x, ipaddr, sport); 1700 if (!err) 1701 break; 1702 } 1703 rcu_read_unlock(); 1704 return err; 1705 } 1706 EXPORT_SYMBOL(km_new_mapping); 1707 1708 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1709 { 1710 struct net *net = xp_net(pol); 1711 struct km_event c; 1712 1713 c.data.hard = hard; 1714 c.portid = portid; 1715 c.event = XFRM_MSG_POLEXPIRE; 1716 km_policy_notify(pol, dir, &c); 1717 1718 if (hard) 1719 wake_up(&net->xfrm.km_waitq); 1720 } 1721 EXPORT_SYMBOL(km_policy_expired); 1722 1723 #ifdef CONFIG_XFRM_MIGRATE 1724 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1725 const struct xfrm_migrate *m, int num_migrate, 1726 const struct xfrm_kmaddress *k) 1727 { 1728 int err = -EINVAL; 1729 int ret; 1730 struct xfrm_mgr *km; 1731 1732 rcu_read_lock(); 1733 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1734 if (km->migrate) { 1735 ret = km->migrate(sel, dir, type, m, num_migrate, k); 1736 if (!ret) 1737 err = ret; 1738 } 1739 } 1740 rcu_read_unlock(); 1741 return err; 1742 } 1743 EXPORT_SYMBOL(km_migrate); 1744 #endif 1745 1746 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 1747 { 1748 int err = -EINVAL; 1749 int ret; 1750 struct xfrm_mgr *km; 1751 1752 rcu_read_lock(); 1753 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1754 if (km->report) { 1755 ret = km->report(net, proto, sel, addr); 1756 if (!ret) 1757 err = ret; 1758 } 1759 } 1760 rcu_read_unlock(); 1761 return err; 1762 } 1763 EXPORT_SYMBOL(km_report); 1764 1765 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1766 { 1767 int err; 1768 u8 *data; 1769 struct xfrm_mgr *km; 1770 struct xfrm_policy *pol = NULL; 1771 1772 if (optlen <= 0 || optlen > PAGE_SIZE) 1773 return -EMSGSIZE; 1774 1775 data = kmalloc(optlen, GFP_KERNEL); 1776 if (!data) 1777 return -ENOMEM; 1778 1779 err = -EFAULT; 1780 if (copy_from_user(data, optval, optlen)) 1781 goto out; 1782 1783 err = -EINVAL; 1784 rcu_read_lock(); 1785 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1786 pol = km->compile_policy(sk, optname, data, 1787 optlen, &err); 1788 if (err >= 0) 1789 break; 1790 } 1791 rcu_read_unlock(); 1792 1793 if (err >= 0) { 1794 xfrm_sk_policy_insert(sk, err, pol); 1795 xfrm_pol_put(pol); 1796 err = 0; 1797 } 1798 1799 out: 1800 kfree(data); 1801 return err; 1802 } 1803 EXPORT_SYMBOL(xfrm_user_policy); 1804 1805 static DEFINE_SPINLOCK(xfrm_km_lock); 1806 1807 int xfrm_register_km(struct xfrm_mgr *km) 1808 { 1809 spin_lock_bh(&xfrm_km_lock); 1810 list_add_tail_rcu(&km->list, &xfrm_km_list); 1811 spin_unlock_bh(&xfrm_km_lock); 1812 return 0; 1813 } 1814 EXPORT_SYMBOL(xfrm_register_km); 1815 1816 int xfrm_unregister_km(struct xfrm_mgr *km) 1817 { 1818 spin_lock_bh(&xfrm_km_lock); 1819 list_del_rcu(&km->list); 1820 spin_unlock_bh(&xfrm_km_lock); 1821 synchronize_rcu(); 1822 return 0; 1823 } 1824 EXPORT_SYMBOL(xfrm_unregister_km); 1825 1826 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 1827 { 1828 int err = 0; 1829 if (unlikely(afinfo == NULL)) 1830 return -EINVAL; 1831 if (unlikely(afinfo->family >= NPROTO)) 1832 return -EAFNOSUPPORT; 1833 spin_lock_bh(&xfrm_state_afinfo_lock); 1834 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 1835 err = -ENOBUFS; 1836 else 1837 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 1838 spin_unlock_bh(&xfrm_state_afinfo_lock); 1839 return err; 1840 } 1841 EXPORT_SYMBOL(xfrm_state_register_afinfo); 1842 1843 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 1844 { 1845 int err = 0; 1846 if (unlikely(afinfo == NULL)) 1847 return -EINVAL; 1848 if (unlikely(afinfo->family >= NPROTO)) 1849 return -EAFNOSUPPORT; 1850 spin_lock_bh(&xfrm_state_afinfo_lock); 1851 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 1852 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) 1853 err = -EINVAL; 1854 else 1855 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 1856 } 1857 spin_unlock_bh(&xfrm_state_afinfo_lock); 1858 synchronize_rcu(); 1859 return err; 1860 } 1861 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 1862 1863 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 1864 { 1865 struct xfrm_state_afinfo *afinfo; 1866 if (unlikely(family >= NPROTO)) 1867 return NULL; 1868 rcu_read_lock(); 1869 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 1870 if (unlikely(!afinfo)) 1871 rcu_read_unlock(); 1872 return afinfo; 1873 } 1874 1875 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) 1876 { 1877 rcu_read_unlock(); 1878 } 1879 1880 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 1881 void xfrm_state_delete_tunnel(struct xfrm_state *x) 1882 { 1883 if (x->tunnel) { 1884 struct xfrm_state *t = x->tunnel; 1885 1886 if (atomic_read(&t->tunnel_users) == 2) 1887 xfrm_state_delete(t); 1888 atomic_dec(&t->tunnel_users); 1889 xfrm_state_put(t); 1890 x->tunnel = NULL; 1891 } 1892 } 1893 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 1894 1895 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 1896 { 1897 int res; 1898 1899 spin_lock_bh(&x->lock); 1900 if (x->km.state == XFRM_STATE_VALID && 1901 x->type && x->type->get_mtu) 1902 res = x->type->get_mtu(x, mtu); 1903 else 1904 res = mtu - x->props.header_len; 1905 spin_unlock_bh(&x->lock); 1906 return res; 1907 } 1908 1909 int __xfrm_init_state(struct xfrm_state *x, bool init_replay) 1910 { 1911 struct xfrm_state_afinfo *afinfo; 1912 struct xfrm_mode *inner_mode; 1913 int family = x->props.family; 1914 int err; 1915 1916 err = -EAFNOSUPPORT; 1917 afinfo = xfrm_state_get_afinfo(family); 1918 if (!afinfo) 1919 goto error; 1920 1921 err = 0; 1922 if (afinfo->init_flags) 1923 err = afinfo->init_flags(x); 1924 1925 xfrm_state_put_afinfo(afinfo); 1926 1927 if (err) 1928 goto error; 1929 1930 err = -EPROTONOSUPPORT; 1931 1932 if (x->sel.family != AF_UNSPEC) { 1933 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 1934 if (inner_mode == NULL) 1935 goto error; 1936 1937 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 1938 family != x->sel.family) { 1939 xfrm_put_mode(inner_mode); 1940 goto error; 1941 } 1942 1943 x->inner_mode = inner_mode; 1944 } else { 1945 struct xfrm_mode *inner_mode_iaf; 1946 int iafamily = AF_INET; 1947 1948 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 1949 if (inner_mode == NULL) 1950 goto error; 1951 1952 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 1953 xfrm_put_mode(inner_mode); 1954 goto error; 1955 } 1956 x->inner_mode = inner_mode; 1957 1958 if (x->props.family == AF_INET) 1959 iafamily = AF_INET6; 1960 1961 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 1962 if (inner_mode_iaf) { 1963 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 1964 x->inner_mode_iaf = inner_mode_iaf; 1965 else 1966 xfrm_put_mode(inner_mode_iaf); 1967 } 1968 } 1969 1970 x->type = xfrm_get_type(x->id.proto, family); 1971 if (x->type == NULL) 1972 goto error; 1973 1974 err = x->type->init_state(x); 1975 if (err) 1976 goto error; 1977 1978 x->outer_mode = xfrm_get_mode(x->props.mode, family); 1979 if (x->outer_mode == NULL) { 1980 err = -EPROTONOSUPPORT; 1981 goto error; 1982 } 1983 1984 if (init_replay) { 1985 err = xfrm_init_replay(x); 1986 if (err) 1987 goto error; 1988 } 1989 1990 x->km.state = XFRM_STATE_VALID; 1991 1992 error: 1993 return err; 1994 } 1995 1996 EXPORT_SYMBOL(__xfrm_init_state); 1997 1998 int xfrm_init_state(struct xfrm_state *x) 1999 { 2000 return __xfrm_init_state(x, true); 2001 } 2002 2003 EXPORT_SYMBOL(xfrm_init_state); 2004 2005 int __net_init xfrm_state_init(struct net *net) 2006 { 2007 unsigned int sz; 2008 2009 INIT_LIST_HEAD(&net->xfrm.state_all); 2010 2011 sz = sizeof(struct hlist_head) * 8; 2012 2013 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2014 if (!net->xfrm.state_bydst) 2015 goto out_bydst; 2016 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2017 if (!net->xfrm.state_bysrc) 2018 goto out_bysrc; 2019 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2020 if (!net->xfrm.state_byspi) 2021 goto out_byspi; 2022 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2023 2024 net->xfrm.state_num = 0; 2025 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2026 INIT_HLIST_HEAD(&net->xfrm.state_gc_list); 2027 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); 2028 init_waitqueue_head(&net->xfrm.km_waitq); 2029 return 0; 2030 2031 out_byspi: 2032 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2033 out_bysrc: 2034 xfrm_hash_free(net->xfrm.state_bydst, sz); 2035 out_bydst: 2036 return -ENOMEM; 2037 } 2038 2039 void xfrm_state_fini(struct net *net) 2040 { 2041 struct xfrm_audit audit_info; 2042 unsigned int sz; 2043 2044 flush_work(&net->xfrm.state_hash_work); 2045 audit_info.loginuid = INVALID_UID; 2046 audit_info.sessionid = -1; 2047 audit_info.secid = 0; 2048 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); 2049 flush_work(&net->xfrm.state_gc_work); 2050 2051 WARN_ON(!list_empty(&net->xfrm.state_all)); 2052 2053 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2054 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2055 xfrm_hash_free(net->xfrm.state_byspi, sz); 2056 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2057 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2058 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2059 xfrm_hash_free(net->xfrm.state_bydst, sz); 2060 } 2061 2062 #ifdef CONFIG_AUDITSYSCALL 2063 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2064 struct audit_buffer *audit_buf) 2065 { 2066 struct xfrm_sec_ctx *ctx = x->security; 2067 u32 spi = ntohl(x->id.spi); 2068 2069 if (ctx) 2070 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2071 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2072 2073 switch(x->props.family) { 2074 case AF_INET: 2075 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2076 &x->props.saddr.a4, &x->id.daddr.a4); 2077 break; 2078 case AF_INET6: 2079 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2080 x->props.saddr.a6, x->id.daddr.a6); 2081 break; 2082 } 2083 2084 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2085 } 2086 2087 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2088 struct audit_buffer *audit_buf) 2089 { 2090 const struct iphdr *iph4; 2091 const struct ipv6hdr *iph6; 2092 2093 switch (family) { 2094 case AF_INET: 2095 iph4 = ip_hdr(skb); 2096 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2097 &iph4->saddr, &iph4->daddr); 2098 break; 2099 case AF_INET6: 2100 iph6 = ipv6_hdr(skb); 2101 audit_log_format(audit_buf, 2102 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2103 &iph6->saddr,&iph6->daddr, 2104 iph6->flow_lbl[0] & 0x0f, 2105 iph6->flow_lbl[1], 2106 iph6->flow_lbl[2]); 2107 break; 2108 } 2109 } 2110 2111 void xfrm_audit_state_add(struct xfrm_state *x, int result, 2112 kuid_t auid, u32 sessionid, u32 secid) 2113 { 2114 struct audit_buffer *audit_buf; 2115 2116 audit_buf = xfrm_audit_start("SAD-add"); 2117 if (audit_buf == NULL) 2118 return; 2119 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2120 xfrm_audit_helper_sainfo(x, audit_buf); 2121 audit_log_format(audit_buf, " res=%u", result); 2122 audit_log_end(audit_buf); 2123 } 2124 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2125 2126 void xfrm_audit_state_delete(struct xfrm_state *x, int result, 2127 kuid_t auid, u32 sessionid, u32 secid) 2128 { 2129 struct audit_buffer *audit_buf; 2130 2131 audit_buf = xfrm_audit_start("SAD-delete"); 2132 if (audit_buf == NULL) 2133 return; 2134 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2135 xfrm_audit_helper_sainfo(x, audit_buf); 2136 audit_log_format(audit_buf, " res=%u", result); 2137 audit_log_end(audit_buf); 2138 } 2139 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2140 2141 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2142 struct sk_buff *skb) 2143 { 2144 struct audit_buffer *audit_buf; 2145 u32 spi; 2146 2147 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2148 if (audit_buf == NULL) 2149 return; 2150 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2151 /* don't record the sequence number because it's inherent in this kind 2152 * of audit message */ 2153 spi = ntohl(x->id.spi); 2154 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2155 audit_log_end(audit_buf); 2156 } 2157 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2158 2159 void xfrm_audit_state_replay(struct xfrm_state *x, 2160 struct sk_buff *skb, __be32 net_seq) 2161 { 2162 struct audit_buffer *audit_buf; 2163 u32 spi; 2164 2165 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2166 if (audit_buf == NULL) 2167 return; 2168 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2169 spi = ntohl(x->id.spi); 2170 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2171 spi, spi, ntohl(net_seq)); 2172 audit_log_end(audit_buf); 2173 } 2174 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2175 2176 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2177 { 2178 struct audit_buffer *audit_buf; 2179 2180 audit_buf = xfrm_audit_start("SA-notfound"); 2181 if (audit_buf == NULL) 2182 return; 2183 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2184 audit_log_end(audit_buf); 2185 } 2186 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2187 2188 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2189 __be32 net_spi, __be32 net_seq) 2190 { 2191 struct audit_buffer *audit_buf; 2192 u32 spi; 2193 2194 audit_buf = xfrm_audit_start("SA-notfound"); 2195 if (audit_buf == NULL) 2196 return; 2197 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2198 spi = ntohl(net_spi); 2199 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2200 spi, spi, ntohl(net_seq)); 2201 audit_log_end(audit_buf); 2202 } 2203 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2204 2205 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2206 struct sk_buff *skb, u8 proto) 2207 { 2208 struct audit_buffer *audit_buf; 2209 __be32 net_spi; 2210 __be32 net_seq; 2211 2212 audit_buf = xfrm_audit_start("SA-icv-failure"); 2213 if (audit_buf == NULL) 2214 return; 2215 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2216 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2217 u32 spi = ntohl(net_spi); 2218 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2219 spi, spi, ntohl(net_seq)); 2220 } 2221 audit_log_end(audit_buf); 2222 } 2223 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2224 #endif /* CONFIG_AUDITSYSCALL */ 2225