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 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 43 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 44 45 static inline unsigned int xfrm_dst_hash(struct net *net, 46 const xfrm_address_t *daddr, 47 const xfrm_address_t *saddr, 48 u32 reqid, 49 unsigned short family) 50 { 51 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 52 } 53 54 static inline unsigned int xfrm_src_hash(struct net *net, 55 const xfrm_address_t *daddr, 56 const xfrm_address_t *saddr, 57 unsigned short family) 58 { 59 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 60 } 61 62 static inline unsigned int 63 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 64 __be32 spi, u8 proto, unsigned short family) 65 { 66 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 67 } 68 69 static void xfrm_hash_transfer(struct hlist_head *list, 70 struct hlist_head *ndsttable, 71 struct hlist_head *nsrctable, 72 struct hlist_head *nspitable, 73 unsigned int nhashmask) 74 { 75 struct hlist_node *entry, *tmp; 76 struct xfrm_state *x; 77 78 hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { 79 unsigned int h; 80 81 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 82 x->props.reqid, x->props.family, 83 nhashmask); 84 hlist_add_head(&x->bydst, ndsttable+h); 85 86 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 87 x->props.family, 88 nhashmask); 89 hlist_add_head(&x->bysrc, nsrctable+h); 90 91 if (x->id.spi) { 92 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 93 x->id.proto, x->props.family, 94 nhashmask); 95 hlist_add_head(&x->byspi, nspitable+h); 96 } 97 } 98 } 99 100 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 101 { 102 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 103 } 104 105 static DEFINE_MUTEX(hash_resize_mutex); 106 107 static void xfrm_hash_resize(struct work_struct *work) 108 { 109 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 110 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 111 unsigned long nsize, osize; 112 unsigned int nhashmask, ohashmask; 113 int i; 114 115 mutex_lock(&hash_resize_mutex); 116 117 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 118 ndst = xfrm_hash_alloc(nsize); 119 if (!ndst) 120 goto out_unlock; 121 nsrc = xfrm_hash_alloc(nsize); 122 if (!nsrc) { 123 xfrm_hash_free(ndst, nsize); 124 goto out_unlock; 125 } 126 nspi = xfrm_hash_alloc(nsize); 127 if (!nspi) { 128 xfrm_hash_free(ndst, nsize); 129 xfrm_hash_free(nsrc, nsize); 130 goto out_unlock; 131 } 132 133 spin_lock_bh(&xfrm_state_lock); 134 135 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 136 for (i = net->xfrm.state_hmask; i >= 0; i--) 137 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, 138 nhashmask); 139 140 odst = net->xfrm.state_bydst; 141 osrc = net->xfrm.state_bysrc; 142 ospi = net->xfrm.state_byspi; 143 ohashmask = net->xfrm.state_hmask; 144 145 net->xfrm.state_bydst = ndst; 146 net->xfrm.state_bysrc = nsrc; 147 net->xfrm.state_byspi = nspi; 148 net->xfrm.state_hmask = nhashmask; 149 150 spin_unlock_bh(&xfrm_state_lock); 151 152 osize = (ohashmask + 1) * sizeof(struct hlist_head); 153 xfrm_hash_free(odst, osize); 154 xfrm_hash_free(osrc, osize); 155 xfrm_hash_free(ospi, osize); 156 157 out_unlock: 158 mutex_unlock(&hash_resize_mutex); 159 } 160 161 static DEFINE_RWLOCK(xfrm_state_afinfo_lock); 162 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; 163 164 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 165 166 int __xfrm_state_delete(struct xfrm_state *x); 167 168 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 169 void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 170 171 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) 172 { 173 struct xfrm_state_afinfo *afinfo; 174 if (unlikely(family >= NPROTO)) 175 return NULL; 176 write_lock_bh(&xfrm_state_afinfo_lock); 177 afinfo = xfrm_state_afinfo[family]; 178 if (unlikely(!afinfo)) 179 write_unlock_bh(&xfrm_state_afinfo_lock); 180 return afinfo; 181 } 182 183 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) 184 __releases(xfrm_state_afinfo_lock) 185 { 186 write_unlock_bh(&xfrm_state_afinfo_lock); 187 } 188 189 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 190 { 191 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); 192 const struct xfrm_type **typemap; 193 int err = 0; 194 195 if (unlikely(afinfo == NULL)) 196 return -EAFNOSUPPORT; 197 typemap = afinfo->type_map; 198 199 if (likely(typemap[type->proto] == NULL)) 200 typemap[type->proto] = type; 201 else 202 err = -EEXIST; 203 xfrm_state_unlock_afinfo(afinfo); 204 return err; 205 } 206 EXPORT_SYMBOL(xfrm_register_type); 207 208 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 209 { 210 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); 211 const struct xfrm_type **typemap; 212 int err = 0; 213 214 if (unlikely(afinfo == NULL)) 215 return -EAFNOSUPPORT; 216 typemap = afinfo->type_map; 217 218 if (unlikely(typemap[type->proto] != type)) 219 err = -ENOENT; 220 else 221 typemap[type->proto] = NULL; 222 xfrm_state_unlock_afinfo(afinfo); 223 return err; 224 } 225 EXPORT_SYMBOL(xfrm_unregister_type); 226 227 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 228 { 229 struct xfrm_state_afinfo *afinfo; 230 const struct xfrm_type **typemap; 231 const struct xfrm_type *type; 232 int modload_attempted = 0; 233 234 retry: 235 afinfo = xfrm_state_get_afinfo(family); 236 if (unlikely(afinfo == NULL)) 237 return NULL; 238 typemap = afinfo->type_map; 239 240 type = typemap[proto]; 241 if (unlikely(type && !try_module_get(type->owner))) 242 type = NULL; 243 if (!type && !modload_attempted) { 244 xfrm_state_put_afinfo(afinfo); 245 request_module("xfrm-type-%d-%d", family, proto); 246 modload_attempted = 1; 247 goto retry; 248 } 249 250 xfrm_state_put_afinfo(afinfo); 251 return type; 252 } 253 254 static void xfrm_put_type(const struct xfrm_type *type) 255 { 256 module_put(type->owner); 257 } 258 259 int xfrm_register_mode(struct xfrm_mode *mode, int family) 260 { 261 struct xfrm_state_afinfo *afinfo; 262 struct xfrm_mode **modemap; 263 int err; 264 265 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 266 return -EINVAL; 267 268 afinfo = xfrm_state_lock_afinfo(family); 269 if (unlikely(afinfo == NULL)) 270 return -EAFNOSUPPORT; 271 272 err = -EEXIST; 273 modemap = afinfo->mode_map; 274 if (modemap[mode->encap]) 275 goto out; 276 277 err = -ENOENT; 278 if (!try_module_get(afinfo->owner)) 279 goto out; 280 281 mode->afinfo = afinfo; 282 modemap[mode->encap] = mode; 283 err = 0; 284 285 out: 286 xfrm_state_unlock_afinfo(afinfo); 287 return err; 288 } 289 EXPORT_SYMBOL(xfrm_register_mode); 290 291 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 292 { 293 struct xfrm_state_afinfo *afinfo; 294 struct xfrm_mode **modemap; 295 int err; 296 297 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 298 return -EINVAL; 299 300 afinfo = xfrm_state_lock_afinfo(family); 301 if (unlikely(afinfo == NULL)) 302 return -EAFNOSUPPORT; 303 304 err = -ENOENT; 305 modemap = afinfo->mode_map; 306 if (likely(modemap[mode->encap] == mode)) { 307 modemap[mode->encap] = NULL; 308 module_put(mode->afinfo->owner); 309 err = 0; 310 } 311 312 xfrm_state_unlock_afinfo(afinfo); 313 return err; 314 } 315 EXPORT_SYMBOL(xfrm_unregister_mode); 316 317 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 318 { 319 struct xfrm_state_afinfo *afinfo; 320 struct xfrm_mode *mode; 321 int modload_attempted = 0; 322 323 if (unlikely(encap >= XFRM_MODE_MAX)) 324 return NULL; 325 326 retry: 327 afinfo = xfrm_state_get_afinfo(family); 328 if (unlikely(afinfo == NULL)) 329 return NULL; 330 331 mode = afinfo->mode_map[encap]; 332 if (unlikely(mode && !try_module_get(mode->owner))) 333 mode = NULL; 334 if (!mode && !modload_attempted) { 335 xfrm_state_put_afinfo(afinfo); 336 request_module("xfrm-mode-%d-%d", family, encap); 337 modload_attempted = 1; 338 goto retry; 339 } 340 341 xfrm_state_put_afinfo(afinfo); 342 return mode; 343 } 344 345 static void xfrm_put_mode(struct xfrm_mode *mode) 346 { 347 module_put(mode->owner); 348 } 349 350 static void xfrm_state_gc_destroy(struct xfrm_state *x) 351 { 352 tasklet_hrtimer_cancel(&x->mtimer); 353 del_timer_sync(&x->rtimer); 354 kfree(x->aalg); 355 kfree(x->ealg); 356 kfree(x->calg); 357 kfree(x->encap); 358 kfree(x->coaddr); 359 kfree(x->replay_esn); 360 kfree(x->preplay_esn); 361 if (x->inner_mode) 362 xfrm_put_mode(x->inner_mode); 363 if (x->inner_mode_iaf) 364 xfrm_put_mode(x->inner_mode_iaf); 365 if (x->outer_mode) 366 xfrm_put_mode(x->outer_mode); 367 if (x->type) { 368 x->type->destructor(x); 369 xfrm_put_type(x->type); 370 } 371 security_xfrm_state_free(x); 372 kfree(x); 373 } 374 375 static void xfrm_state_gc_task(struct work_struct *work) 376 { 377 struct net *net = container_of(work, struct net, xfrm.state_gc_work); 378 struct xfrm_state *x; 379 struct hlist_node *entry, *tmp; 380 struct hlist_head gc_list; 381 382 spin_lock_bh(&xfrm_state_gc_lock); 383 hlist_move_list(&net->xfrm.state_gc_list, &gc_list); 384 spin_unlock_bh(&xfrm_state_gc_lock); 385 386 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) 387 xfrm_state_gc_destroy(x); 388 389 wake_up(&net->xfrm.km_waitq); 390 } 391 392 static inline unsigned long make_jiffies(long secs) 393 { 394 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) 395 return MAX_SCHEDULE_TIMEOUT-1; 396 else 397 return secs*HZ; 398 } 399 400 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) 401 { 402 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 403 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 404 struct net *net = xs_net(x); 405 unsigned long now = get_seconds(); 406 long next = LONG_MAX; 407 int warn = 0; 408 int err = 0; 409 410 spin_lock(&x->lock); 411 if (x->km.state == XFRM_STATE_DEAD) 412 goto out; 413 if (x->km.state == XFRM_STATE_EXPIRED) 414 goto expired; 415 if (x->lft.hard_add_expires_seconds) { 416 long tmo = x->lft.hard_add_expires_seconds + 417 x->curlft.add_time - now; 418 if (tmo <= 0) 419 goto expired; 420 if (tmo < next) 421 next = tmo; 422 } 423 if (x->lft.hard_use_expires_seconds) { 424 long tmo = x->lft.hard_use_expires_seconds + 425 (x->curlft.use_time ? : now) - now; 426 if (tmo <= 0) 427 goto expired; 428 if (tmo < next) 429 next = tmo; 430 } 431 if (x->km.dying) 432 goto resched; 433 if (x->lft.soft_add_expires_seconds) { 434 long tmo = x->lft.soft_add_expires_seconds + 435 x->curlft.add_time - now; 436 if (tmo <= 0) 437 warn = 1; 438 else if (tmo < next) 439 next = tmo; 440 } 441 if (x->lft.soft_use_expires_seconds) { 442 long tmo = x->lft.soft_use_expires_seconds + 443 (x->curlft.use_time ? : now) - now; 444 if (tmo <= 0) 445 warn = 1; 446 else if (tmo < next) 447 next = tmo; 448 } 449 450 x->km.dying = warn; 451 if (warn) 452 km_state_expired(x, 0, 0); 453 resched: 454 if (next != LONG_MAX){ 455 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 456 } 457 458 goto out; 459 460 expired: 461 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { 462 x->km.state = XFRM_STATE_EXPIRED; 463 wake_up(&net->xfrm.km_waitq); 464 next = 2; 465 goto resched; 466 } 467 468 err = __xfrm_state_delete(x); 469 if (!err && x->id.spi) 470 km_state_expired(x, 1, 0); 471 472 xfrm_audit_state_delete(x, err ? 0 : 1, 473 audit_get_loginuid(current), 474 audit_get_sessionid(current), 0); 475 476 out: 477 spin_unlock(&x->lock); 478 return HRTIMER_NORESTART; 479 } 480 481 static void xfrm_replay_timer_handler(unsigned long data); 482 483 struct xfrm_state *xfrm_state_alloc(struct net *net) 484 { 485 struct xfrm_state *x; 486 487 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 488 489 if (x) { 490 write_pnet(&x->xs_net, net); 491 atomic_set(&x->refcnt, 1); 492 atomic_set(&x->tunnel_users, 0); 493 INIT_LIST_HEAD(&x->km.all); 494 INIT_HLIST_NODE(&x->bydst); 495 INIT_HLIST_NODE(&x->bysrc); 496 INIT_HLIST_NODE(&x->byspi); 497 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); 498 setup_timer(&x->rtimer, xfrm_replay_timer_handler, 499 (unsigned long)x); 500 x->curlft.add_time = get_seconds(); 501 x->lft.soft_byte_limit = XFRM_INF; 502 x->lft.soft_packet_limit = XFRM_INF; 503 x->lft.hard_byte_limit = XFRM_INF; 504 x->lft.hard_packet_limit = XFRM_INF; 505 x->replay_maxage = 0; 506 x->replay_maxdiff = 0; 507 x->inner_mode = NULL; 508 x->inner_mode_iaf = NULL; 509 spin_lock_init(&x->lock); 510 } 511 return x; 512 } 513 EXPORT_SYMBOL(xfrm_state_alloc); 514 515 void __xfrm_state_destroy(struct xfrm_state *x) 516 { 517 struct net *net = xs_net(x); 518 519 WARN_ON(x->km.state != XFRM_STATE_DEAD); 520 521 spin_lock_bh(&xfrm_state_gc_lock); 522 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); 523 spin_unlock_bh(&xfrm_state_gc_lock); 524 schedule_work(&net->xfrm.state_gc_work); 525 } 526 EXPORT_SYMBOL(__xfrm_state_destroy); 527 528 int __xfrm_state_delete(struct xfrm_state *x) 529 { 530 struct net *net = xs_net(x); 531 int err = -ESRCH; 532 533 if (x->km.state != XFRM_STATE_DEAD) { 534 x->km.state = XFRM_STATE_DEAD; 535 spin_lock(&xfrm_state_lock); 536 list_del(&x->km.all); 537 hlist_del(&x->bydst); 538 hlist_del(&x->bysrc); 539 if (x->id.spi) 540 hlist_del(&x->byspi); 541 net->xfrm.state_num--; 542 spin_unlock(&xfrm_state_lock); 543 544 /* All xfrm_state objects are created by xfrm_state_alloc. 545 * The xfrm_state_alloc call gives a reference, and that 546 * is what we are dropping here. 547 */ 548 xfrm_state_put(x); 549 err = 0; 550 } 551 552 return err; 553 } 554 EXPORT_SYMBOL(__xfrm_state_delete); 555 556 int xfrm_state_delete(struct xfrm_state *x) 557 { 558 int err; 559 560 spin_lock_bh(&x->lock); 561 err = __xfrm_state_delete(x); 562 spin_unlock_bh(&x->lock); 563 564 return err; 565 } 566 EXPORT_SYMBOL(xfrm_state_delete); 567 568 #ifdef CONFIG_SECURITY_NETWORK_XFRM 569 static inline int 570 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 571 { 572 int i, err = 0; 573 574 for (i = 0; i <= net->xfrm.state_hmask; i++) { 575 struct hlist_node *entry; 576 struct xfrm_state *x; 577 578 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { 579 if (xfrm_id_proto_match(x->id.proto, proto) && 580 (err = security_xfrm_state_delete(x)) != 0) { 581 xfrm_audit_state_delete(x, 0, 582 audit_info->loginuid, 583 audit_info->sessionid, 584 audit_info->secid); 585 return err; 586 } 587 } 588 } 589 590 return err; 591 } 592 #else 593 static inline int 594 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 595 { 596 return 0; 597 } 598 #endif 599 600 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) 601 { 602 int i, err = 0, cnt = 0; 603 604 spin_lock_bh(&xfrm_state_lock); 605 err = xfrm_state_flush_secctx_check(net, proto, audit_info); 606 if (err) 607 goto out; 608 609 err = -ESRCH; 610 for (i = 0; i <= net->xfrm.state_hmask; i++) { 611 struct hlist_node *entry; 612 struct xfrm_state *x; 613 restart: 614 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { 615 if (!xfrm_state_kern(x) && 616 xfrm_id_proto_match(x->id.proto, proto)) { 617 xfrm_state_hold(x); 618 spin_unlock_bh(&xfrm_state_lock); 619 620 err = xfrm_state_delete(x); 621 xfrm_audit_state_delete(x, err ? 0 : 1, 622 audit_info->loginuid, 623 audit_info->sessionid, 624 audit_info->secid); 625 xfrm_state_put(x); 626 if (!err) 627 cnt++; 628 629 spin_lock_bh(&xfrm_state_lock); 630 goto restart; 631 } 632 } 633 } 634 if (cnt) 635 err = 0; 636 637 out: 638 spin_unlock_bh(&xfrm_state_lock); 639 wake_up(&net->xfrm.km_waitq); 640 return err; 641 } 642 EXPORT_SYMBOL(xfrm_state_flush); 643 644 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 645 { 646 spin_lock_bh(&xfrm_state_lock); 647 si->sadcnt = net->xfrm.state_num; 648 si->sadhcnt = net->xfrm.state_hmask; 649 si->sadhmcnt = xfrm_state_hashmax; 650 spin_unlock_bh(&xfrm_state_lock); 651 } 652 EXPORT_SYMBOL(xfrm_sad_getinfo); 653 654 static int 655 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 656 const struct xfrm_tmpl *tmpl, 657 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 658 unsigned short family) 659 { 660 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 661 if (!afinfo) 662 return -1; 663 afinfo->init_tempsel(&x->sel, fl); 664 665 if (family != tmpl->encap_family) { 666 xfrm_state_put_afinfo(afinfo); 667 afinfo = xfrm_state_get_afinfo(tmpl->encap_family); 668 if (!afinfo) 669 return -1; 670 } 671 afinfo->init_temprop(x, tmpl, daddr, saddr); 672 xfrm_state_put_afinfo(afinfo); 673 return 0; 674 } 675 676 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 677 const xfrm_address_t *daddr, 678 __be32 spi, u8 proto, 679 unsigned short family) 680 { 681 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 682 struct xfrm_state *x; 683 struct hlist_node *entry; 684 685 hlist_for_each_entry(x, entry, 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_cmp(&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 struct hlist_node *entry; 709 710 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { 711 if (x->props.family != family || 712 x->id.proto != proto || 713 xfrm_addr_cmp(&x->id.daddr, daddr, family) || 714 xfrm_addr_cmp(&x->props.saddr, saddr, family)) 715 continue; 716 717 if ((mark & x->mark.m) != x->mark.v) 718 continue; 719 xfrm_state_hold(x); 720 return x; 721 } 722 723 return NULL; 724 } 725 726 static inline struct xfrm_state * 727 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 728 { 729 struct net *net = xs_net(x); 730 u32 mark = x->mark.v & x->mark.m; 731 732 if (use_spi) 733 return __xfrm_state_lookup(net, mark, &x->id.daddr, 734 x->id.spi, x->id.proto, family); 735 else 736 return __xfrm_state_lookup_byaddr(net, mark, 737 &x->id.daddr, 738 &x->props.saddr, 739 x->id.proto, family); 740 } 741 742 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 743 { 744 if (have_hash_collision && 745 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 746 net->xfrm.state_num > net->xfrm.state_hmask) 747 schedule_work(&net->xfrm.state_hash_work); 748 } 749 750 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 751 const struct flowi *fl, unsigned short family, 752 struct xfrm_state **best, int *acq_in_progress, 753 int *error) 754 { 755 /* Resolution logic: 756 * 1. There is a valid state with matching selector. Done. 757 * 2. Valid state with inappropriate selector. Skip. 758 * 759 * Entering area of "sysdeps". 760 * 761 * 3. If state is not valid, selector is temporary, it selects 762 * only session which triggered previous resolution. Key 763 * manager will do something to install a state with proper 764 * selector. 765 */ 766 if (x->km.state == XFRM_STATE_VALID) { 767 if ((x->sel.family && 768 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 769 !security_xfrm_state_pol_flow_match(x, pol, fl)) 770 return; 771 772 if (!*best || 773 (*best)->km.dying > x->km.dying || 774 ((*best)->km.dying == x->km.dying && 775 (*best)->curlft.add_time < x->curlft.add_time)) 776 *best = x; 777 } else if (x->km.state == XFRM_STATE_ACQ) { 778 *acq_in_progress = 1; 779 } else if (x->km.state == XFRM_STATE_ERROR || 780 x->km.state == XFRM_STATE_EXPIRED) { 781 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 782 security_xfrm_state_pol_flow_match(x, pol, fl)) 783 *error = -ESRCH; 784 } 785 } 786 787 struct xfrm_state * 788 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 789 const struct flowi *fl, struct xfrm_tmpl *tmpl, 790 struct xfrm_policy *pol, int *err, 791 unsigned short family) 792 { 793 static xfrm_address_t saddr_wildcard = { }; 794 struct net *net = xp_net(pol); 795 unsigned int h, h_wildcard; 796 struct hlist_node *entry; 797 struct xfrm_state *x, *x0, *to_put; 798 int acquire_in_progress = 0; 799 int error = 0; 800 struct xfrm_state *best = NULL; 801 u32 mark = pol->mark.v & pol->mark.m; 802 unsigned short encap_family = tmpl->encap_family; 803 804 to_put = NULL; 805 806 spin_lock_bh(&xfrm_state_lock); 807 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 808 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { 809 if (x->props.family == encap_family && 810 x->props.reqid == tmpl->reqid && 811 (mark & x->mark.m) == x->mark.v && 812 !(x->props.flags & XFRM_STATE_WILDRECV) && 813 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 814 tmpl->mode == x->props.mode && 815 tmpl->id.proto == x->id.proto && 816 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 817 xfrm_state_look_at(pol, x, fl, encap_family, 818 &best, &acquire_in_progress, &error); 819 } 820 if (best) 821 goto found; 822 823 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 824 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { 825 if (x->props.family == encap_family && 826 x->props.reqid == tmpl->reqid && 827 (mark & x->mark.m) == x->mark.v && 828 !(x->props.flags & XFRM_STATE_WILDRECV) && 829 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 830 tmpl->mode == x->props.mode && 831 tmpl->id.proto == x->id.proto && 832 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 833 xfrm_state_look_at(pol, x, fl, encap_family, 834 &best, &acquire_in_progress, &error); 835 } 836 837 found: 838 x = best; 839 if (!x && !error && !acquire_in_progress) { 840 if (tmpl->id.spi && 841 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 842 tmpl->id.proto, encap_family)) != NULL) { 843 to_put = x0; 844 error = -EEXIST; 845 goto out; 846 } 847 x = xfrm_state_alloc(net); 848 if (x == NULL) { 849 error = -ENOMEM; 850 goto out; 851 } 852 /* Initialize temporary state matching only 853 * to current session. */ 854 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 855 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 856 857 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 858 if (error) { 859 x->km.state = XFRM_STATE_DEAD; 860 to_put = x; 861 x = NULL; 862 goto out; 863 } 864 865 if (km_query(x, tmpl, pol) == 0) { 866 x->km.state = XFRM_STATE_ACQ; 867 list_add(&x->km.all, &net->xfrm.state_all); 868 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 869 h = xfrm_src_hash(net, daddr, saddr, encap_family); 870 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 871 if (x->id.spi) { 872 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 873 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 874 } 875 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 876 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 877 net->xfrm.state_num++; 878 xfrm_hash_grow_check(net, x->bydst.next != NULL); 879 } else { 880 x->km.state = XFRM_STATE_DEAD; 881 to_put = x; 882 x = NULL; 883 error = -ESRCH; 884 } 885 } 886 out: 887 if (x) 888 xfrm_state_hold(x); 889 else 890 *err = acquire_in_progress ? -EAGAIN : error; 891 spin_unlock_bh(&xfrm_state_lock); 892 if (to_put) 893 xfrm_state_put(to_put); 894 return x; 895 } 896 897 struct xfrm_state * 898 xfrm_stateonly_find(struct net *net, u32 mark, 899 xfrm_address_t *daddr, xfrm_address_t *saddr, 900 unsigned short family, u8 mode, u8 proto, u32 reqid) 901 { 902 unsigned int h; 903 struct xfrm_state *rx = NULL, *x = NULL; 904 struct hlist_node *entry; 905 906 spin_lock(&xfrm_state_lock); 907 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 908 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { 909 if (x->props.family == family && 910 x->props.reqid == reqid && 911 (mark & x->mark.m) == x->mark.v && 912 !(x->props.flags & XFRM_STATE_WILDRECV) && 913 xfrm_state_addr_check(x, daddr, saddr, family) && 914 mode == x->props.mode && 915 proto == x->id.proto && 916 x->km.state == XFRM_STATE_VALID) { 917 rx = x; 918 break; 919 } 920 } 921 922 if (rx) 923 xfrm_state_hold(rx); 924 spin_unlock(&xfrm_state_lock); 925 926 927 return rx; 928 } 929 EXPORT_SYMBOL(xfrm_stateonly_find); 930 931 static void __xfrm_state_insert(struct xfrm_state *x) 932 { 933 struct net *net = xs_net(x); 934 unsigned int h; 935 936 list_add(&x->km.all, &net->xfrm.state_all); 937 938 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 939 x->props.reqid, x->props.family); 940 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 941 942 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 943 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 944 945 if (x->id.spi) { 946 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 947 x->props.family); 948 949 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 950 } 951 952 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 953 if (x->replay_maxage) 954 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 955 956 wake_up(&net->xfrm.km_waitq); 957 958 net->xfrm.state_num++; 959 960 xfrm_hash_grow_check(net, x->bydst.next != NULL); 961 } 962 963 /* xfrm_state_lock is held */ 964 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 965 { 966 struct net *net = xs_net(xnew); 967 unsigned short family = xnew->props.family; 968 u32 reqid = xnew->props.reqid; 969 struct xfrm_state *x; 970 struct hlist_node *entry; 971 unsigned int h; 972 u32 mark = xnew->mark.v & xnew->mark.m; 973 974 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 975 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { 976 if (x->props.family == family && 977 x->props.reqid == reqid && 978 (mark & x->mark.m) == x->mark.v && 979 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && 980 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) 981 x->genid++; 982 } 983 } 984 985 void xfrm_state_insert(struct xfrm_state *x) 986 { 987 spin_lock_bh(&xfrm_state_lock); 988 __xfrm_state_bump_genids(x); 989 __xfrm_state_insert(x); 990 spin_unlock_bh(&xfrm_state_lock); 991 } 992 EXPORT_SYMBOL(xfrm_state_insert); 993 994 /* xfrm_state_lock is held */ 995 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, 996 unsigned short family, u8 mode, 997 u32 reqid, u8 proto, 998 const xfrm_address_t *daddr, 999 const xfrm_address_t *saddr, int create) 1000 { 1001 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1002 struct hlist_node *entry; 1003 struct xfrm_state *x; 1004 u32 mark = m->v & m->m; 1005 1006 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { 1007 if (x->props.reqid != reqid || 1008 x->props.mode != mode || 1009 x->props.family != family || 1010 x->km.state != XFRM_STATE_ACQ || 1011 x->id.spi != 0 || 1012 x->id.proto != proto || 1013 (mark & x->mark.m) != x->mark.v || 1014 xfrm_addr_cmp(&x->id.daddr, daddr, family) || 1015 xfrm_addr_cmp(&x->props.saddr, saddr, family)) 1016 continue; 1017 1018 xfrm_state_hold(x); 1019 return x; 1020 } 1021 1022 if (!create) 1023 return NULL; 1024 1025 x = xfrm_state_alloc(net); 1026 if (likely(x)) { 1027 switch (family) { 1028 case AF_INET: 1029 x->sel.daddr.a4 = daddr->a4; 1030 x->sel.saddr.a4 = saddr->a4; 1031 x->sel.prefixlen_d = 32; 1032 x->sel.prefixlen_s = 32; 1033 x->props.saddr.a4 = saddr->a4; 1034 x->id.daddr.a4 = daddr->a4; 1035 break; 1036 1037 case AF_INET6: 1038 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, 1039 (const struct in6_addr *)daddr); 1040 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, 1041 (const struct in6_addr *)saddr); 1042 x->sel.prefixlen_d = 128; 1043 x->sel.prefixlen_s = 128; 1044 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, 1045 (const struct in6_addr *)saddr); 1046 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, 1047 (const struct in6_addr *)daddr); 1048 break; 1049 } 1050 1051 x->km.state = XFRM_STATE_ACQ; 1052 x->id.proto = proto; 1053 x->props.family = family; 1054 x->props.mode = mode; 1055 x->props.reqid = reqid; 1056 x->mark.v = m->v; 1057 x->mark.m = m->m; 1058 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1059 xfrm_state_hold(x); 1060 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1061 list_add(&x->km.all, &net->xfrm.state_all); 1062 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 1063 h = xfrm_src_hash(net, daddr, saddr, family); 1064 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 1065 1066 net->xfrm.state_num++; 1067 1068 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1069 } 1070 1071 return x; 1072 } 1073 1074 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1075 1076 int xfrm_state_add(struct xfrm_state *x) 1077 { 1078 struct net *net = xs_net(x); 1079 struct xfrm_state *x1, *to_put; 1080 int family; 1081 int err; 1082 u32 mark = x->mark.v & x->mark.m; 1083 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1084 1085 family = x->props.family; 1086 1087 to_put = NULL; 1088 1089 spin_lock_bh(&xfrm_state_lock); 1090 1091 x1 = __xfrm_state_locate(x, use_spi, family); 1092 if (x1) { 1093 to_put = x1; 1094 x1 = NULL; 1095 err = -EEXIST; 1096 goto out; 1097 } 1098 1099 if (use_spi && x->km.seq) { 1100 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1101 if (x1 && ((x1->id.proto != x->id.proto) || 1102 xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { 1103 to_put = x1; 1104 x1 = NULL; 1105 } 1106 } 1107 1108 if (use_spi && !x1) 1109 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1110 x->props.reqid, x->id.proto, 1111 &x->id.daddr, &x->props.saddr, 0); 1112 1113 __xfrm_state_bump_genids(x); 1114 __xfrm_state_insert(x); 1115 err = 0; 1116 1117 out: 1118 spin_unlock_bh(&xfrm_state_lock); 1119 1120 if (x1) { 1121 xfrm_state_delete(x1); 1122 xfrm_state_put(x1); 1123 } 1124 1125 if (to_put) 1126 xfrm_state_put(to_put); 1127 1128 return err; 1129 } 1130 EXPORT_SYMBOL(xfrm_state_add); 1131 1132 #ifdef CONFIG_XFRM_MIGRATE 1133 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) 1134 { 1135 struct net *net = xs_net(orig); 1136 int err = -ENOMEM; 1137 struct xfrm_state *x = xfrm_state_alloc(net); 1138 if (!x) 1139 goto out; 1140 1141 memcpy(&x->id, &orig->id, sizeof(x->id)); 1142 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1143 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1144 x->props.mode = orig->props.mode; 1145 x->props.replay_window = orig->props.replay_window; 1146 x->props.reqid = orig->props.reqid; 1147 x->props.family = orig->props.family; 1148 x->props.saddr = orig->props.saddr; 1149 1150 if (orig->aalg) { 1151 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1152 if (!x->aalg) 1153 goto error; 1154 } 1155 x->props.aalgo = orig->props.aalgo; 1156 1157 if (orig->ealg) { 1158 x->ealg = xfrm_algo_clone(orig->ealg); 1159 if (!x->ealg) 1160 goto error; 1161 } 1162 x->props.ealgo = orig->props.ealgo; 1163 1164 if (orig->calg) { 1165 x->calg = xfrm_algo_clone(orig->calg); 1166 if (!x->calg) 1167 goto error; 1168 } 1169 x->props.calgo = orig->props.calgo; 1170 1171 if (orig->encap) { 1172 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); 1173 if (!x->encap) 1174 goto error; 1175 } 1176 1177 if (orig->coaddr) { 1178 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1179 GFP_KERNEL); 1180 if (!x->coaddr) 1181 goto error; 1182 } 1183 1184 if (orig->replay_esn) { 1185 err = xfrm_replay_clone(x, orig); 1186 if (err) 1187 goto error; 1188 } 1189 1190 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1191 1192 err = xfrm_init_state(x); 1193 if (err) 1194 goto error; 1195 1196 x->props.flags = orig->props.flags; 1197 1198 x->curlft.add_time = orig->curlft.add_time; 1199 x->km.state = orig->km.state; 1200 x->km.seq = orig->km.seq; 1201 1202 return x; 1203 1204 error: 1205 xfrm_state_put(x); 1206 out: 1207 if (errp) 1208 *errp = err; 1209 return NULL; 1210 } 1211 1212 /* xfrm_state_lock is held */ 1213 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) 1214 { 1215 unsigned int h; 1216 struct xfrm_state *x; 1217 struct hlist_node *entry; 1218 1219 if (m->reqid) { 1220 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, 1221 m->reqid, m->old_family); 1222 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { 1223 if (x->props.mode != m->mode || 1224 x->id.proto != m->proto) 1225 continue; 1226 if (m->reqid && x->props.reqid != m->reqid) 1227 continue; 1228 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, 1229 m->old_family) || 1230 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, 1231 m->old_family)) 1232 continue; 1233 xfrm_state_hold(x); 1234 return x; 1235 } 1236 } else { 1237 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, 1238 m->old_family); 1239 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { 1240 if (x->props.mode != m->mode || 1241 x->id.proto != m->proto) 1242 continue; 1243 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, 1244 m->old_family) || 1245 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, 1246 m->old_family)) 1247 continue; 1248 xfrm_state_hold(x); 1249 return x; 1250 } 1251 } 1252 1253 return NULL; 1254 } 1255 EXPORT_SYMBOL(xfrm_migrate_state_find); 1256 1257 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1258 struct xfrm_migrate *m) 1259 { 1260 struct xfrm_state *xc; 1261 int err; 1262 1263 xc = xfrm_state_clone(x, &err); 1264 if (!xc) 1265 return NULL; 1266 1267 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1268 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1269 1270 /* add state */ 1271 if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { 1272 /* a care is needed when the destination address of the 1273 state is to be updated as it is a part of triplet */ 1274 xfrm_state_insert(xc); 1275 } else { 1276 if ((err = xfrm_state_add(xc)) < 0) 1277 goto error; 1278 } 1279 1280 return xc; 1281 error: 1282 xfrm_state_put(xc); 1283 return NULL; 1284 } 1285 EXPORT_SYMBOL(xfrm_state_migrate); 1286 #endif 1287 1288 int xfrm_state_update(struct xfrm_state *x) 1289 { 1290 struct xfrm_state *x1, *to_put; 1291 int err; 1292 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1293 1294 to_put = NULL; 1295 1296 spin_lock_bh(&xfrm_state_lock); 1297 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1298 1299 err = -ESRCH; 1300 if (!x1) 1301 goto out; 1302 1303 if (xfrm_state_kern(x1)) { 1304 to_put = x1; 1305 err = -EEXIST; 1306 goto out; 1307 } 1308 1309 if (x1->km.state == XFRM_STATE_ACQ) { 1310 __xfrm_state_insert(x); 1311 x = NULL; 1312 } 1313 err = 0; 1314 1315 out: 1316 spin_unlock_bh(&xfrm_state_lock); 1317 1318 if (to_put) 1319 xfrm_state_put(to_put); 1320 1321 if (err) 1322 return err; 1323 1324 if (!x) { 1325 xfrm_state_delete(x1); 1326 xfrm_state_put(x1); 1327 return 0; 1328 } 1329 1330 err = -EINVAL; 1331 spin_lock_bh(&x1->lock); 1332 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1333 if (x->encap && x1->encap) 1334 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1335 if (x->coaddr && x1->coaddr) { 1336 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1337 } 1338 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1339 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1340 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1341 x1->km.dying = 0; 1342 1343 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1344 if (x1->curlft.use_time) 1345 xfrm_state_check_expire(x1); 1346 1347 err = 0; 1348 x->km.state = XFRM_STATE_DEAD; 1349 __xfrm_state_put(x); 1350 } 1351 spin_unlock_bh(&x1->lock); 1352 1353 xfrm_state_put(x1); 1354 1355 return err; 1356 } 1357 EXPORT_SYMBOL(xfrm_state_update); 1358 1359 int xfrm_state_check_expire(struct xfrm_state *x) 1360 { 1361 if (!x->curlft.use_time) 1362 x->curlft.use_time = get_seconds(); 1363 1364 if (x->km.state != XFRM_STATE_VALID) 1365 return -EINVAL; 1366 1367 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1368 x->curlft.packets >= x->lft.hard_packet_limit) { 1369 x->km.state = XFRM_STATE_EXPIRED; 1370 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); 1371 return -EINVAL; 1372 } 1373 1374 if (!x->km.dying && 1375 (x->curlft.bytes >= x->lft.soft_byte_limit || 1376 x->curlft.packets >= x->lft.soft_packet_limit)) { 1377 x->km.dying = 1; 1378 km_state_expired(x, 0, 0); 1379 } 1380 return 0; 1381 } 1382 EXPORT_SYMBOL(xfrm_state_check_expire); 1383 1384 struct xfrm_state * 1385 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1386 u8 proto, unsigned short family) 1387 { 1388 struct xfrm_state *x; 1389 1390 spin_lock_bh(&xfrm_state_lock); 1391 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1392 spin_unlock_bh(&xfrm_state_lock); 1393 return x; 1394 } 1395 EXPORT_SYMBOL(xfrm_state_lookup); 1396 1397 struct xfrm_state * 1398 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1399 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1400 u8 proto, unsigned short family) 1401 { 1402 struct xfrm_state *x; 1403 1404 spin_lock_bh(&xfrm_state_lock); 1405 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1406 spin_unlock_bh(&xfrm_state_lock); 1407 return x; 1408 } 1409 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1410 1411 struct xfrm_state * 1412 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, 1413 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1414 int create, unsigned short family) 1415 { 1416 struct xfrm_state *x; 1417 1418 spin_lock_bh(&xfrm_state_lock); 1419 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1420 spin_unlock_bh(&xfrm_state_lock); 1421 1422 return x; 1423 } 1424 EXPORT_SYMBOL(xfrm_find_acq); 1425 1426 #ifdef CONFIG_XFRM_SUB_POLICY 1427 int 1428 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1429 unsigned short family) 1430 { 1431 int err = 0; 1432 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1433 if (!afinfo) 1434 return -EAFNOSUPPORT; 1435 1436 spin_lock_bh(&xfrm_state_lock); 1437 if (afinfo->tmpl_sort) 1438 err = afinfo->tmpl_sort(dst, src, n); 1439 spin_unlock_bh(&xfrm_state_lock); 1440 xfrm_state_put_afinfo(afinfo); 1441 return err; 1442 } 1443 EXPORT_SYMBOL(xfrm_tmpl_sort); 1444 1445 int 1446 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1447 unsigned short family) 1448 { 1449 int err = 0; 1450 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1451 if (!afinfo) 1452 return -EAFNOSUPPORT; 1453 1454 spin_lock_bh(&xfrm_state_lock); 1455 if (afinfo->state_sort) 1456 err = afinfo->state_sort(dst, src, n); 1457 spin_unlock_bh(&xfrm_state_lock); 1458 xfrm_state_put_afinfo(afinfo); 1459 return err; 1460 } 1461 EXPORT_SYMBOL(xfrm_state_sort); 1462 #endif 1463 1464 /* Silly enough, but I'm lazy to build resolution list */ 1465 1466 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1467 { 1468 int i; 1469 1470 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1471 struct hlist_node *entry; 1472 struct xfrm_state *x; 1473 1474 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { 1475 if (x->km.seq == seq && 1476 (mark & x->mark.m) == x->mark.v && 1477 x->km.state == XFRM_STATE_ACQ) { 1478 xfrm_state_hold(x); 1479 return x; 1480 } 1481 } 1482 } 1483 return NULL; 1484 } 1485 1486 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1487 { 1488 struct xfrm_state *x; 1489 1490 spin_lock_bh(&xfrm_state_lock); 1491 x = __xfrm_find_acq_byseq(net, mark, seq); 1492 spin_unlock_bh(&xfrm_state_lock); 1493 return x; 1494 } 1495 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1496 1497 u32 xfrm_get_acqseq(void) 1498 { 1499 u32 res; 1500 static atomic_t acqseq; 1501 1502 do { 1503 res = atomic_inc_return(&acqseq); 1504 } while (!res); 1505 1506 return res; 1507 } 1508 EXPORT_SYMBOL(xfrm_get_acqseq); 1509 1510 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1511 { 1512 struct net *net = xs_net(x); 1513 unsigned int h; 1514 struct xfrm_state *x0; 1515 int err = -ENOENT; 1516 __be32 minspi = htonl(low); 1517 __be32 maxspi = htonl(high); 1518 u32 mark = x->mark.v & x->mark.m; 1519 1520 spin_lock_bh(&x->lock); 1521 if (x->km.state == XFRM_STATE_DEAD) 1522 goto unlock; 1523 1524 err = 0; 1525 if (x->id.spi) 1526 goto unlock; 1527 1528 err = -ENOENT; 1529 1530 if (minspi == maxspi) { 1531 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1532 if (x0) { 1533 xfrm_state_put(x0); 1534 goto unlock; 1535 } 1536 x->id.spi = minspi; 1537 } else { 1538 u32 spi = 0; 1539 for (h=0; h<high-low+1; h++) { 1540 spi = low + net_random()%(high-low+1); 1541 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1542 if (x0 == NULL) { 1543 x->id.spi = htonl(spi); 1544 break; 1545 } 1546 xfrm_state_put(x0); 1547 } 1548 } 1549 if (x->id.spi) { 1550 spin_lock_bh(&xfrm_state_lock); 1551 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1552 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 1553 spin_unlock_bh(&xfrm_state_lock); 1554 1555 err = 0; 1556 } 1557 1558 unlock: 1559 spin_unlock_bh(&x->lock); 1560 1561 return err; 1562 } 1563 EXPORT_SYMBOL(xfrm_alloc_spi); 1564 1565 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1566 int (*func)(struct xfrm_state *, int, void*), 1567 void *data) 1568 { 1569 struct xfrm_state *state; 1570 struct xfrm_state_walk *x; 1571 int err = 0; 1572 1573 if (walk->seq != 0 && list_empty(&walk->all)) 1574 return 0; 1575 1576 spin_lock_bh(&xfrm_state_lock); 1577 if (list_empty(&walk->all)) 1578 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1579 else 1580 x = list_entry(&walk->all, struct xfrm_state_walk, all); 1581 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1582 if (x->state == XFRM_STATE_DEAD) 1583 continue; 1584 state = container_of(x, struct xfrm_state, km); 1585 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1586 continue; 1587 err = func(state, walk->seq, data); 1588 if (err) { 1589 list_move_tail(&walk->all, &x->all); 1590 goto out; 1591 } 1592 walk->seq++; 1593 } 1594 if (walk->seq == 0) { 1595 err = -ENOENT; 1596 goto out; 1597 } 1598 list_del_init(&walk->all); 1599 out: 1600 spin_unlock_bh(&xfrm_state_lock); 1601 return err; 1602 } 1603 EXPORT_SYMBOL(xfrm_state_walk); 1604 1605 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1606 { 1607 INIT_LIST_HEAD(&walk->all); 1608 walk->proto = proto; 1609 walk->state = XFRM_STATE_DEAD; 1610 walk->seq = 0; 1611 } 1612 EXPORT_SYMBOL(xfrm_state_walk_init); 1613 1614 void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1615 { 1616 if (list_empty(&walk->all)) 1617 return; 1618 1619 spin_lock_bh(&xfrm_state_lock); 1620 list_del(&walk->all); 1621 spin_unlock_bh(&xfrm_state_lock); 1622 } 1623 EXPORT_SYMBOL(xfrm_state_walk_done); 1624 1625 static void xfrm_replay_timer_handler(unsigned long data) 1626 { 1627 struct xfrm_state *x = (struct xfrm_state*)data; 1628 1629 spin_lock(&x->lock); 1630 1631 if (x->km.state == XFRM_STATE_VALID) { 1632 if (xfrm_aevent_is_on(xs_net(x))) 1633 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1634 else 1635 x->xflags |= XFRM_TIME_DEFER; 1636 } 1637 1638 spin_unlock(&x->lock); 1639 } 1640 1641 static LIST_HEAD(xfrm_km_list); 1642 static DEFINE_RWLOCK(xfrm_km_lock); 1643 1644 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1645 { 1646 struct xfrm_mgr *km; 1647 1648 read_lock(&xfrm_km_lock); 1649 list_for_each_entry(km, &xfrm_km_list, list) 1650 if (km->notify_policy) 1651 km->notify_policy(xp, dir, c); 1652 read_unlock(&xfrm_km_lock); 1653 } 1654 1655 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1656 { 1657 struct xfrm_mgr *km; 1658 read_lock(&xfrm_km_lock); 1659 list_for_each_entry(km, &xfrm_km_list, list) 1660 if (km->notify) 1661 km->notify(x, c); 1662 read_unlock(&xfrm_km_lock); 1663 } 1664 1665 EXPORT_SYMBOL(km_policy_notify); 1666 EXPORT_SYMBOL(km_state_notify); 1667 1668 void km_state_expired(struct xfrm_state *x, int hard, u32 pid) 1669 { 1670 struct net *net = xs_net(x); 1671 struct km_event c; 1672 1673 c.data.hard = hard; 1674 c.pid = pid; 1675 c.event = XFRM_MSG_EXPIRE; 1676 km_state_notify(x, &c); 1677 1678 if (hard) 1679 wake_up(&net->xfrm.km_waitq); 1680 } 1681 1682 EXPORT_SYMBOL(km_state_expired); 1683 /* 1684 * We send to all registered managers regardless of failure 1685 * We are happy with one success 1686 */ 1687 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1688 { 1689 int err = -EINVAL, acqret; 1690 struct xfrm_mgr *km; 1691 1692 read_lock(&xfrm_km_lock); 1693 list_for_each_entry(km, &xfrm_km_list, list) { 1694 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); 1695 if (!acqret) 1696 err = acqret; 1697 } 1698 read_unlock(&xfrm_km_lock); 1699 return err; 1700 } 1701 EXPORT_SYMBOL(km_query); 1702 1703 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1704 { 1705 int err = -EINVAL; 1706 struct xfrm_mgr *km; 1707 1708 read_lock(&xfrm_km_lock); 1709 list_for_each_entry(km, &xfrm_km_list, list) { 1710 if (km->new_mapping) 1711 err = km->new_mapping(x, ipaddr, sport); 1712 if (!err) 1713 break; 1714 } 1715 read_unlock(&xfrm_km_lock); 1716 return err; 1717 } 1718 EXPORT_SYMBOL(km_new_mapping); 1719 1720 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) 1721 { 1722 struct net *net = xp_net(pol); 1723 struct km_event c; 1724 1725 c.data.hard = hard; 1726 c.pid = pid; 1727 c.event = XFRM_MSG_POLEXPIRE; 1728 km_policy_notify(pol, dir, &c); 1729 1730 if (hard) 1731 wake_up(&net->xfrm.km_waitq); 1732 } 1733 EXPORT_SYMBOL(km_policy_expired); 1734 1735 #ifdef CONFIG_XFRM_MIGRATE 1736 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1737 const struct xfrm_migrate *m, int num_migrate, 1738 const struct xfrm_kmaddress *k) 1739 { 1740 int err = -EINVAL; 1741 int ret; 1742 struct xfrm_mgr *km; 1743 1744 read_lock(&xfrm_km_lock); 1745 list_for_each_entry(km, &xfrm_km_list, list) { 1746 if (km->migrate) { 1747 ret = km->migrate(sel, dir, type, m, num_migrate, k); 1748 if (!ret) 1749 err = ret; 1750 } 1751 } 1752 read_unlock(&xfrm_km_lock); 1753 return err; 1754 } 1755 EXPORT_SYMBOL(km_migrate); 1756 #endif 1757 1758 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 1759 { 1760 int err = -EINVAL; 1761 int ret; 1762 struct xfrm_mgr *km; 1763 1764 read_lock(&xfrm_km_lock); 1765 list_for_each_entry(km, &xfrm_km_list, list) { 1766 if (km->report) { 1767 ret = km->report(net, proto, sel, addr); 1768 if (!ret) 1769 err = ret; 1770 } 1771 } 1772 read_unlock(&xfrm_km_lock); 1773 return err; 1774 } 1775 EXPORT_SYMBOL(km_report); 1776 1777 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1778 { 1779 int err; 1780 u8 *data; 1781 struct xfrm_mgr *km; 1782 struct xfrm_policy *pol = NULL; 1783 1784 if (optlen <= 0 || optlen > PAGE_SIZE) 1785 return -EMSGSIZE; 1786 1787 data = kmalloc(optlen, GFP_KERNEL); 1788 if (!data) 1789 return -ENOMEM; 1790 1791 err = -EFAULT; 1792 if (copy_from_user(data, optval, optlen)) 1793 goto out; 1794 1795 err = -EINVAL; 1796 read_lock(&xfrm_km_lock); 1797 list_for_each_entry(km, &xfrm_km_list, list) { 1798 pol = km->compile_policy(sk, optname, data, 1799 optlen, &err); 1800 if (err >= 0) 1801 break; 1802 } 1803 read_unlock(&xfrm_km_lock); 1804 1805 if (err >= 0) { 1806 xfrm_sk_policy_insert(sk, err, pol); 1807 xfrm_pol_put(pol); 1808 err = 0; 1809 } 1810 1811 out: 1812 kfree(data); 1813 return err; 1814 } 1815 EXPORT_SYMBOL(xfrm_user_policy); 1816 1817 int xfrm_register_km(struct xfrm_mgr *km) 1818 { 1819 write_lock_bh(&xfrm_km_lock); 1820 list_add_tail(&km->list, &xfrm_km_list); 1821 write_unlock_bh(&xfrm_km_lock); 1822 return 0; 1823 } 1824 EXPORT_SYMBOL(xfrm_register_km); 1825 1826 int xfrm_unregister_km(struct xfrm_mgr *km) 1827 { 1828 write_lock_bh(&xfrm_km_lock); 1829 list_del(&km->list); 1830 write_unlock_bh(&xfrm_km_lock); 1831 return 0; 1832 } 1833 EXPORT_SYMBOL(xfrm_unregister_km); 1834 1835 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 1836 { 1837 int err = 0; 1838 if (unlikely(afinfo == NULL)) 1839 return -EINVAL; 1840 if (unlikely(afinfo->family >= NPROTO)) 1841 return -EAFNOSUPPORT; 1842 write_lock_bh(&xfrm_state_afinfo_lock); 1843 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 1844 err = -ENOBUFS; 1845 else 1846 xfrm_state_afinfo[afinfo->family] = afinfo; 1847 write_unlock_bh(&xfrm_state_afinfo_lock); 1848 return err; 1849 } 1850 EXPORT_SYMBOL(xfrm_state_register_afinfo); 1851 1852 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 1853 { 1854 int err = 0; 1855 if (unlikely(afinfo == NULL)) 1856 return -EINVAL; 1857 if (unlikely(afinfo->family >= NPROTO)) 1858 return -EAFNOSUPPORT; 1859 write_lock_bh(&xfrm_state_afinfo_lock); 1860 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 1861 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) 1862 err = -EINVAL; 1863 else 1864 xfrm_state_afinfo[afinfo->family] = NULL; 1865 } 1866 write_unlock_bh(&xfrm_state_afinfo_lock); 1867 return err; 1868 } 1869 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 1870 1871 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 1872 { 1873 struct xfrm_state_afinfo *afinfo; 1874 if (unlikely(family >= NPROTO)) 1875 return NULL; 1876 read_lock(&xfrm_state_afinfo_lock); 1877 afinfo = xfrm_state_afinfo[family]; 1878 if (unlikely(!afinfo)) 1879 read_unlock(&xfrm_state_afinfo_lock); 1880 return afinfo; 1881 } 1882 1883 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) 1884 __releases(xfrm_state_afinfo_lock) 1885 { 1886 read_unlock(&xfrm_state_afinfo_lock); 1887 } 1888 1889 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 1890 void xfrm_state_delete_tunnel(struct xfrm_state *x) 1891 { 1892 if (x->tunnel) { 1893 struct xfrm_state *t = x->tunnel; 1894 1895 if (atomic_read(&t->tunnel_users) == 2) 1896 xfrm_state_delete(t); 1897 atomic_dec(&t->tunnel_users); 1898 xfrm_state_put(t); 1899 x->tunnel = NULL; 1900 } 1901 } 1902 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 1903 1904 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 1905 { 1906 int res; 1907 1908 spin_lock_bh(&x->lock); 1909 if (x->km.state == XFRM_STATE_VALID && 1910 x->type && x->type->get_mtu) 1911 res = x->type->get_mtu(x, mtu); 1912 else 1913 res = mtu - x->props.header_len; 1914 spin_unlock_bh(&x->lock); 1915 return res; 1916 } 1917 1918 int __xfrm_init_state(struct xfrm_state *x, bool init_replay) 1919 { 1920 struct xfrm_state_afinfo *afinfo; 1921 struct xfrm_mode *inner_mode; 1922 int family = x->props.family; 1923 int err; 1924 1925 err = -EAFNOSUPPORT; 1926 afinfo = xfrm_state_get_afinfo(family); 1927 if (!afinfo) 1928 goto error; 1929 1930 err = 0; 1931 if (afinfo->init_flags) 1932 err = afinfo->init_flags(x); 1933 1934 xfrm_state_put_afinfo(afinfo); 1935 1936 if (err) 1937 goto error; 1938 1939 err = -EPROTONOSUPPORT; 1940 1941 if (x->sel.family != AF_UNSPEC) { 1942 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 1943 if (inner_mode == NULL) 1944 goto error; 1945 1946 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 1947 family != x->sel.family) { 1948 xfrm_put_mode(inner_mode); 1949 goto error; 1950 } 1951 1952 x->inner_mode = inner_mode; 1953 } else { 1954 struct xfrm_mode *inner_mode_iaf; 1955 int iafamily = AF_INET; 1956 1957 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 1958 if (inner_mode == NULL) 1959 goto error; 1960 1961 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 1962 xfrm_put_mode(inner_mode); 1963 goto error; 1964 } 1965 x->inner_mode = inner_mode; 1966 1967 if (x->props.family == AF_INET) 1968 iafamily = AF_INET6; 1969 1970 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 1971 if (inner_mode_iaf) { 1972 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 1973 x->inner_mode_iaf = inner_mode_iaf; 1974 else 1975 xfrm_put_mode(inner_mode_iaf); 1976 } 1977 } 1978 1979 x->type = xfrm_get_type(x->id.proto, family); 1980 if (x->type == NULL) 1981 goto error; 1982 1983 err = x->type->init_state(x); 1984 if (err) 1985 goto error; 1986 1987 x->outer_mode = xfrm_get_mode(x->props.mode, family); 1988 if (x->outer_mode == NULL) 1989 goto error; 1990 1991 if (init_replay) { 1992 err = xfrm_init_replay(x); 1993 if (err) 1994 goto error; 1995 } 1996 1997 x->km.state = XFRM_STATE_VALID; 1998 1999 error: 2000 return err; 2001 } 2002 2003 EXPORT_SYMBOL(__xfrm_init_state); 2004 2005 int xfrm_init_state(struct xfrm_state *x) 2006 { 2007 return __xfrm_init_state(x, true); 2008 } 2009 2010 EXPORT_SYMBOL(xfrm_init_state); 2011 2012 int __net_init xfrm_state_init(struct net *net) 2013 { 2014 unsigned int sz; 2015 2016 INIT_LIST_HEAD(&net->xfrm.state_all); 2017 2018 sz = sizeof(struct hlist_head) * 8; 2019 2020 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2021 if (!net->xfrm.state_bydst) 2022 goto out_bydst; 2023 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2024 if (!net->xfrm.state_bysrc) 2025 goto out_bysrc; 2026 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2027 if (!net->xfrm.state_byspi) 2028 goto out_byspi; 2029 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2030 2031 net->xfrm.state_num = 0; 2032 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2033 INIT_HLIST_HEAD(&net->xfrm.state_gc_list); 2034 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); 2035 init_waitqueue_head(&net->xfrm.km_waitq); 2036 return 0; 2037 2038 out_byspi: 2039 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2040 out_bysrc: 2041 xfrm_hash_free(net->xfrm.state_bydst, sz); 2042 out_bydst: 2043 return -ENOMEM; 2044 } 2045 2046 void xfrm_state_fini(struct net *net) 2047 { 2048 struct xfrm_audit audit_info; 2049 unsigned int sz; 2050 2051 flush_work(&net->xfrm.state_hash_work); 2052 audit_info.loginuid = -1; 2053 audit_info.sessionid = -1; 2054 audit_info.secid = 0; 2055 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); 2056 flush_work(&net->xfrm.state_gc_work); 2057 2058 WARN_ON(!list_empty(&net->xfrm.state_all)); 2059 2060 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2061 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2062 xfrm_hash_free(net->xfrm.state_byspi, sz); 2063 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2064 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2065 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2066 xfrm_hash_free(net->xfrm.state_bydst, sz); 2067 } 2068 2069 #ifdef CONFIG_AUDITSYSCALL 2070 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2071 struct audit_buffer *audit_buf) 2072 { 2073 struct xfrm_sec_ctx *ctx = x->security; 2074 u32 spi = ntohl(x->id.spi); 2075 2076 if (ctx) 2077 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2078 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2079 2080 switch(x->props.family) { 2081 case AF_INET: 2082 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2083 &x->props.saddr.a4, &x->id.daddr.a4); 2084 break; 2085 case AF_INET6: 2086 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2087 x->props.saddr.a6, x->id.daddr.a6); 2088 break; 2089 } 2090 2091 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2092 } 2093 2094 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2095 struct audit_buffer *audit_buf) 2096 { 2097 const struct iphdr *iph4; 2098 const struct ipv6hdr *iph6; 2099 2100 switch (family) { 2101 case AF_INET: 2102 iph4 = ip_hdr(skb); 2103 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2104 &iph4->saddr, &iph4->daddr); 2105 break; 2106 case AF_INET6: 2107 iph6 = ipv6_hdr(skb); 2108 audit_log_format(audit_buf, 2109 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2110 &iph6->saddr,&iph6->daddr, 2111 iph6->flow_lbl[0] & 0x0f, 2112 iph6->flow_lbl[1], 2113 iph6->flow_lbl[2]); 2114 break; 2115 } 2116 } 2117 2118 void xfrm_audit_state_add(struct xfrm_state *x, int result, 2119 uid_t auid, u32 sessionid, u32 secid) 2120 { 2121 struct audit_buffer *audit_buf; 2122 2123 audit_buf = xfrm_audit_start("SAD-add"); 2124 if (audit_buf == NULL) 2125 return; 2126 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2127 xfrm_audit_helper_sainfo(x, audit_buf); 2128 audit_log_format(audit_buf, " res=%u", result); 2129 audit_log_end(audit_buf); 2130 } 2131 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2132 2133 void xfrm_audit_state_delete(struct xfrm_state *x, int result, 2134 uid_t auid, u32 sessionid, u32 secid) 2135 { 2136 struct audit_buffer *audit_buf; 2137 2138 audit_buf = xfrm_audit_start("SAD-delete"); 2139 if (audit_buf == NULL) 2140 return; 2141 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2142 xfrm_audit_helper_sainfo(x, audit_buf); 2143 audit_log_format(audit_buf, " res=%u", result); 2144 audit_log_end(audit_buf); 2145 } 2146 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2147 2148 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2149 struct sk_buff *skb) 2150 { 2151 struct audit_buffer *audit_buf; 2152 u32 spi; 2153 2154 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2155 if (audit_buf == NULL) 2156 return; 2157 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2158 /* don't record the sequence number because it's inherent in this kind 2159 * of audit message */ 2160 spi = ntohl(x->id.spi); 2161 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2162 audit_log_end(audit_buf); 2163 } 2164 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2165 2166 void xfrm_audit_state_replay(struct xfrm_state *x, 2167 struct sk_buff *skb, __be32 net_seq) 2168 { 2169 struct audit_buffer *audit_buf; 2170 u32 spi; 2171 2172 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2173 if (audit_buf == NULL) 2174 return; 2175 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2176 spi = ntohl(x->id.spi); 2177 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2178 spi, spi, ntohl(net_seq)); 2179 audit_log_end(audit_buf); 2180 } 2181 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2182 2183 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2184 { 2185 struct audit_buffer *audit_buf; 2186 2187 audit_buf = xfrm_audit_start("SA-notfound"); 2188 if (audit_buf == NULL) 2189 return; 2190 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2191 audit_log_end(audit_buf); 2192 } 2193 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2194 2195 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2196 __be32 net_spi, __be32 net_seq) 2197 { 2198 struct audit_buffer *audit_buf; 2199 u32 spi; 2200 2201 audit_buf = xfrm_audit_start("SA-notfound"); 2202 if (audit_buf == NULL) 2203 return; 2204 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2205 spi = ntohl(net_spi); 2206 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2207 spi, spi, ntohl(net_seq)); 2208 audit_log_end(audit_buf); 2209 } 2210 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2211 2212 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2213 struct sk_buff *skb, u8 proto) 2214 { 2215 struct audit_buffer *audit_buf; 2216 __be32 net_spi; 2217 __be32 net_seq; 2218 2219 audit_buf = xfrm_audit_start("SA-icv-failure"); 2220 if (audit_buf == NULL) 2221 return; 2222 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2223 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2224 u32 spi = ntohl(net_spi); 2225 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2226 spi, spi, ntohl(net_seq)); 2227 } 2228 audit_log_end(audit_buf); 2229 } 2230 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2231 #endif /* CONFIG_AUDITSYSCALL */ 2232