xfrm_state.c revision b71d1d426d263b0b6cb5760322efebbfc89d4463
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 38static DEFINE_SPINLOCK(xfrm_state_lock); 39 40static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 41 42static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 43static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 44 45static 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 54static 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 62static inline unsigned int 63xfrm_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 69static 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 100static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 101{ 102 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 103} 104 105static DEFINE_MUTEX(hash_resize_mutex); 106 107static 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 157out_unlock: 158 mutex_unlock(&hash_resize_mutex); 159} 160 161static DEFINE_RWLOCK(xfrm_state_afinfo_lock); 162static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; 163 164static DEFINE_SPINLOCK(xfrm_state_gc_lock); 165 166int __xfrm_state_delete(struct xfrm_state *x); 167 168int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 169void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 170 171static 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 183static 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 189int 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} 206EXPORT_SYMBOL(xfrm_register_type); 207 208int 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} 225EXPORT_SYMBOL(xfrm_unregister_type); 226 227static 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 234retry: 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 254static void xfrm_put_type(const struct xfrm_type *type) 255{ 256 module_put(type->owner); 257} 258 259int 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 285out: 286 xfrm_state_unlock_afinfo(afinfo); 287 return err; 288} 289EXPORT_SYMBOL(xfrm_register_mode); 290 291int 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} 315EXPORT_SYMBOL(xfrm_unregister_mode); 316 317static 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 326retry: 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 345static void xfrm_put_mode(struct xfrm_mode *mode) 346{ 347 module_put(mode->owner); 348} 349 350static 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 375static 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 392static 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 400static 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); 453resched: 454 if (next != LONG_MAX){ 455 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 456 } 457 458 goto out; 459 460expired: 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 476out: 477 spin_unlock(&x->lock); 478 return HRTIMER_NORESTART; 479} 480 481static void xfrm_replay_timer_handler(unsigned long data); 482 483struct 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} 513EXPORT_SYMBOL(xfrm_state_alloc); 514 515void __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} 526EXPORT_SYMBOL(__xfrm_state_destroy); 527 528int __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} 554EXPORT_SYMBOL(__xfrm_state_delete); 555 556int 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} 566EXPORT_SYMBOL(xfrm_state_delete); 567 568#ifdef CONFIG_SECURITY_NETWORK_XFRM 569static inline int 570xfrm_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 593static inline int 594xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 595{ 596 return 0; 597} 598#endif 599 600int 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; 613restart: 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 637out: 638 spin_unlock_bh(&xfrm_state_lock); 639 wake_up(&net->xfrm.km_waitq); 640 return err; 641} 642EXPORT_SYMBOL(xfrm_state_flush); 643 644void 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} 652EXPORT_SYMBOL(xfrm_sad_getinfo); 653 654static int 655xfrm_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 676static 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 701static 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 726static 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 742static 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 750static 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 787struct xfrm_state * 788xfrm_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 837found: 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 } 886out: 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 897struct xfrm_state * 898xfrm_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} 929EXPORT_SYMBOL(xfrm_stateonly_find); 930 931static 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 */ 964static 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 985void 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} 992EXPORT_SYMBOL(xfrm_state_insert); 993 994/* xfrm_state_lock is held */ 995static 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 1074static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1075 1076int 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 1117out: 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} 1130EXPORT_SYMBOL(xfrm_state_add); 1131 1132#ifdef CONFIG_XFRM_MIGRATE 1133static 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); 1206out: 1207 if (errp) 1208 *errp = err; 1209 return NULL; 1210} 1211 1212/* xfrm_state_lock is held */ 1213struct 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} 1255EXPORT_SYMBOL(xfrm_migrate_state_find); 1256 1257struct 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; 1281error: 1282 xfrm_state_put(xc); 1283 return NULL; 1284} 1285EXPORT_SYMBOL(xfrm_state_migrate); 1286#endif 1287 1288int 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 1315out: 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 } 1349 spin_unlock_bh(&x1->lock); 1350 1351 xfrm_state_put(x1); 1352 1353 return err; 1354} 1355EXPORT_SYMBOL(xfrm_state_update); 1356 1357int xfrm_state_check_expire(struct xfrm_state *x) 1358{ 1359 if (!x->curlft.use_time) 1360 x->curlft.use_time = get_seconds(); 1361 1362 if (x->km.state != XFRM_STATE_VALID) 1363 return -EINVAL; 1364 1365 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1366 x->curlft.packets >= x->lft.hard_packet_limit) { 1367 x->km.state = XFRM_STATE_EXPIRED; 1368 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); 1369 return -EINVAL; 1370 } 1371 1372 if (!x->km.dying && 1373 (x->curlft.bytes >= x->lft.soft_byte_limit || 1374 x->curlft.packets >= x->lft.soft_packet_limit)) { 1375 x->km.dying = 1; 1376 km_state_expired(x, 0, 0); 1377 } 1378 return 0; 1379} 1380EXPORT_SYMBOL(xfrm_state_check_expire); 1381 1382struct xfrm_state * 1383xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1384 u8 proto, unsigned short family) 1385{ 1386 struct xfrm_state *x; 1387 1388 spin_lock_bh(&xfrm_state_lock); 1389 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1390 spin_unlock_bh(&xfrm_state_lock); 1391 return x; 1392} 1393EXPORT_SYMBOL(xfrm_state_lookup); 1394 1395struct xfrm_state * 1396xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1397 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1398 u8 proto, unsigned short family) 1399{ 1400 struct xfrm_state *x; 1401 1402 spin_lock_bh(&xfrm_state_lock); 1403 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1404 spin_unlock_bh(&xfrm_state_lock); 1405 return x; 1406} 1407EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1408 1409struct xfrm_state * 1410xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, 1411 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1412 int create, unsigned short family) 1413{ 1414 struct xfrm_state *x; 1415 1416 spin_lock_bh(&xfrm_state_lock); 1417 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1418 spin_unlock_bh(&xfrm_state_lock); 1419 1420 return x; 1421} 1422EXPORT_SYMBOL(xfrm_find_acq); 1423 1424#ifdef CONFIG_XFRM_SUB_POLICY 1425int 1426xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1427 unsigned short family) 1428{ 1429 int err = 0; 1430 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1431 if (!afinfo) 1432 return -EAFNOSUPPORT; 1433 1434 spin_lock_bh(&xfrm_state_lock); 1435 if (afinfo->tmpl_sort) 1436 err = afinfo->tmpl_sort(dst, src, n); 1437 spin_unlock_bh(&xfrm_state_lock); 1438 xfrm_state_put_afinfo(afinfo); 1439 return err; 1440} 1441EXPORT_SYMBOL(xfrm_tmpl_sort); 1442 1443int 1444xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1445 unsigned short family) 1446{ 1447 int err = 0; 1448 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1449 if (!afinfo) 1450 return -EAFNOSUPPORT; 1451 1452 spin_lock_bh(&xfrm_state_lock); 1453 if (afinfo->state_sort) 1454 err = afinfo->state_sort(dst, src, n); 1455 spin_unlock_bh(&xfrm_state_lock); 1456 xfrm_state_put_afinfo(afinfo); 1457 return err; 1458} 1459EXPORT_SYMBOL(xfrm_state_sort); 1460#endif 1461 1462/* Silly enough, but I'm lazy to build resolution list */ 1463 1464static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1465{ 1466 int i; 1467 1468 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1469 struct hlist_node *entry; 1470 struct xfrm_state *x; 1471 1472 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { 1473 if (x->km.seq == seq && 1474 (mark & x->mark.m) == x->mark.v && 1475 x->km.state == XFRM_STATE_ACQ) { 1476 xfrm_state_hold(x); 1477 return x; 1478 } 1479 } 1480 } 1481 return NULL; 1482} 1483 1484struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1485{ 1486 struct xfrm_state *x; 1487 1488 spin_lock_bh(&xfrm_state_lock); 1489 x = __xfrm_find_acq_byseq(net, mark, seq); 1490 spin_unlock_bh(&xfrm_state_lock); 1491 return x; 1492} 1493EXPORT_SYMBOL(xfrm_find_acq_byseq); 1494 1495u32 xfrm_get_acqseq(void) 1496{ 1497 u32 res; 1498 static atomic_t acqseq; 1499 1500 do { 1501 res = atomic_inc_return(&acqseq); 1502 } while (!res); 1503 1504 return res; 1505} 1506EXPORT_SYMBOL(xfrm_get_acqseq); 1507 1508int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1509{ 1510 struct net *net = xs_net(x); 1511 unsigned int h; 1512 struct xfrm_state *x0; 1513 int err = -ENOENT; 1514 __be32 minspi = htonl(low); 1515 __be32 maxspi = htonl(high); 1516 u32 mark = x->mark.v & x->mark.m; 1517 1518 spin_lock_bh(&x->lock); 1519 if (x->km.state == XFRM_STATE_DEAD) 1520 goto unlock; 1521 1522 err = 0; 1523 if (x->id.spi) 1524 goto unlock; 1525 1526 err = -ENOENT; 1527 1528 if (minspi == maxspi) { 1529 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1530 if (x0) { 1531 xfrm_state_put(x0); 1532 goto unlock; 1533 } 1534 x->id.spi = minspi; 1535 } else { 1536 u32 spi = 0; 1537 for (h=0; h<high-low+1; h++) { 1538 spi = low + net_random()%(high-low+1); 1539 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1540 if (x0 == NULL) { 1541 x->id.spi = htonl(spi); 1542 break; 1543 } 1544 xfrm_state_put(x0); 1545 } 1546 } 1547 if (x->id.spi) { 1548 spin_lock_bh(&xfrm_state_lock); 1549 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1550 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 1551 spin_unlock_bh(&xfrm_state_lock); 1552 1553 err = 0; 1554 } 1555 1556unlock: 1557 spin_unlock_bh(&x->lock); 1558 1559 return err; 1560} 1561EXPORT_SYMBOL(xfrm_alloc_spi); 1562 1563int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1564 int (*func)(struct xfrm_state *, int, void*), 1565 void *data) 1566{ 1567 struct xfrm_state *state; 1568 struct xfrm_state_walk *x; 1569 int err = 0; 1570 1571 if (walk->seq != 0 && list_empty(&walk->all)) 1572 return 0; 1573 1574 spin_lock_bh(&xfrm_state_lock); 1575 if (list_empty(&walk->all)) 1576 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1577 else 1578 x = list_entry(&walk->all, struct xfrm_state_walk, all); 1579 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1580 if (x->state == XFRM_STATE_DEAD) 1581 continue; 1582 state = container_of(x, struct xfrm_state, km); 1583 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1584 continue; 1585 err = func(state, walk->seq, data); 1586 if (err) { 1587 list_move_tail(&walk->all, &x->all); 1588 goto out; 1589 } 1590 walk->seq++; 1591 } 1592 if (walk->seq == 0) { 1593 err = -ENOENT; 1594 goto out; 1595 } 1596 list_del_init(&walk->all); 1597out: 1598 spin_unlock_bh(&xfrm_state_lock); 1599 return err; 1600} 1601EXPORT_SYMBOL(xfrm_state_walk); 1602 1603void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1604{ 1605 INIT_LIST_HEAD(&walk->all); 1606 walk->proto = proto; 1607 walk->state = XFRM_STATE_DEAD; 1608 walk->seq = 0; 1609} 1610EXPORT_SYMBOL(xfrm_state_walk_init); 1611 1612void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1613{ 1614 if (list_empty(&walk->all)) 1615 return; 1616 1617 spin_lock_bh(&xfrm_state_lock); 1618 list_del(&walk->all); 1619 spin_unlock_bh(&xfrm_state_lock); 1620} 1621EXPORT_SYMBOL(xfrm_state_walk_done); 1622 1623static void xfrm_replay_timer_handler(unsigned long data) 1624{ 1625 struct xfrm_state *x = (struct xfrm_state*)data; 1626 1627 spin_lock(&x->lock); 1628 1629 if (x->km.state == XFRM_STATE_VALID) { 1630 if (xfrm_aevent_is_on(xs_net(x))) 1631 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1632 else 1633 x->xflags |= XFRM_TIME_DEFER; 1634 } 1635 1636 spin_unlock(&x->lock); 1637} 1638 1639static LIST_HEAD(xfrm_km_list); 1640static DEFINE_RWLOCK(xfrm_km_lock); 1641 1642void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1643{ 1644 struct xfrm_mgr *km; 1645 1646 read_lock(&xfrm_km_lock); 1647 list_for_each_entry(km, &xfrm_km_list, list) 1648 if (km->notify_policy) 1649 km->notify_policy(xp, dir, c); 1650 read_unlock(&xfrm_km_lock); 1651} 1652 1653void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1654{ 1655 struct xfrm_mgr *km; 1656 read_lock(&xfrm_km_lock); 1657 list_for_each_entry(km, &xfrm_km_list, list) 1658 if (km->notify) 1659 km->notify(x, c); 1660 read_unlock(&xfrm_km_lock); 1661} 1662 1663EXPORT_SYMBOL(km_policy_notify); 1664EXPORT_SYMBOL(km_state_notify); 1665 1666void km_state_expired(struct xfrm_state *x, int hard, u32 pid) 1667{ 1668 struct net *net = xs_net(x); 1669 struct km_event c; 1670 1671 c.data.hard = hard; 1672 c.pid = pid; 1673 c.event = XFRM_MSG_EXPIRE; 1674 km_state_notify(x, &c); 1675 1676 if (hard) 1677 wake_up(&net->xfrm.km_waitq); 1678} 1679 1680EXPORT_SYMBOL(km_state_expired); 1681/* 1682 * We send to all registered managers regardless of failure 1683 * We are happy with one success 1684*/ 1685int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1686{ 1687 int err = -EINVAL, acqret; 1688 struct xfrm_mgr *km; 1689 1690 read_lock(&xfrm_km_lock); 1691 list_for_each_entry(km, &xfrm_km_list, list) { 1692 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); 1693 if (!acqret) 1694 err = acqret; 1695 } 1696 read_unlock(&xfrm_km_lock); 1697 return err; 1698} 1699EXPORT_SYMBOL(km_query); 1700 1701int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1702{ 1703 int err = -EINVAL; 1704 struct xfrm_mgr *km; 1705 1706 read_lock(&xfrm_km_lock); 1707 list_for_each_entry(km, &xfrm_km_list, list) { 1708 if (km->new_mapping) 1709 err = km->new_mapping(x, ipaddr, sport); 1710 if (!err) 1711 break; 1712 } 1713 read_unlock(&xfrm_km_lock); 1714 return err; 1715} 1716EXPORT_SYMBOL(km_new_mapping); 1717 1718void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) 1719{ 1720 struct net *net = xp_net(pol); 1721 struct km_event c; 1722 1723 c.data.hard = hard; 1724 c.pid = pid; 1725 c.event = XFRM_MSG_POLEXPIRE; 1726 km_policy_notify(pol, dir, &c); 1727 1728 if (hard) 1729 wake_up(&net->xfrm.km_waitq); 1730} 1731EXPORT_SYMBOL(km_policy_expired); 1732 1733#ifdef CONFIG_XFRM_MIGRATE 1734int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1735 const struct xfrm_migrate *m, int num_migrate, 1736 const struct xfrm_kmaddress *k) 1737{ 1738 int err = -EINVAL; 1739 int ret; 1740 struct xfrm_mgr *km; 1741 1742 read_lock(&xfrm_km_lock); 1743 list_for_each_entry(km, &xfrm_km_list, list) { 1744 if (km->migrate) { 1745 ret = km->migrate(sel, dir, type, m, num_migrate, k); 1746 if (!ret) 1747 err = ret; 1748 } 1749 } 1750 read_unlock(&xfrm_km_lock); 1751 return err; 1752} 1753EXPORT_SYMBOL(km_migrate); 1754#endif 1755 1756int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 1757{ 1758 int err = -EINVAL; 1759 int ret; 1760 struct xfrm_mgr *km; 1761 1762 read_lock(&xfrm_km_lock); 1763 list_for_each_entry(km, &xfrm_km_list, list) { 1764 if (km->report) { 1765 ret = km->report(net, proto, sel, addr); 1766 if (!ret) 1767 err = ret; 1768 } 1769 } 1770 read_unlock(&xfrm_km_lock); 1771 return err; 1772} 1773EXPORT_SYMBOL(km_report); 1774 1775int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1776{ 1777 int err; 1778 u8 *data; 1779 struct xfrm_mgr *km; 1780 struct xfrm_policy *pol = NULL; 1781 1782 if (optlen <= 0 || optlen > PAGE_SIZE) 1783 return -EMSGSIZE; 1784 1785 data = kmalloc(optlen, GFP_KERNEL); 1786 if (!data) 1787 return -ENOMEM; 1788 1789 err = -EFAULT; 1790 if (copy_from_user(data, optval, optlen)) 1791 goto out; 1792 1793 err = -EINVAL; 1794 read_lock(&xfrm_km_lock); 1795 list_for_each_entry(km, &xfrm_km_list, list) { 1796 pol = km->compile_policy(sk, optname, data, 1797 optlen, &err); 1798 if (err >= 0) 1799 break; 1800 } 1801 read_unlock(&xfrm_km_lock); 1802 1803 if (err >= 0) { 1804 xfrm_sk_policy_insert(sk, err, pol); 1805 xfrm_pol_put(pol); 1806 err = 0; 1807 } 1808 1809out: 1810 kfree(data); 1811 return err; 1812} 1813EXPORT_SYMBOL(xfrm_user_policy); 1814 1815int xfrm_register_km(struct xfrm_mgr *km) 1816{ 1817 write_lock_bh(&xfrm_km_lock); 1818 list_add_tail(&km->list, &xfrm_km_list); 1819 write_unlock_bh(&xfrm_km_lock); 1820 return 0; 1821} 1822EXPORT_SYMBOL(xfrm_register_km); 1823 1824int xfrm_unregister_km(struct xfrm_mgr *km) 1825{ 1826 write_lock_bh(&xfrm_km_lock); 1827 list_del(&km->list); 1828 write_unlock_bh(&xfrm_km_lock); 1829 return 0; 1830} 1831EXPORT_SYMBOL(xfrm_unregister_km); 1832 1833int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 1834{ 1835 int err = 0; 1836 if (unlikely(afinfo == NULL)) 1837 return -EINVAL; 1838 if (unlikely(afinfo->family >= NPROTO)) 1839 return -EAFNOSUPPORT; 1840 write_lock_bh(&xfrm_state_afinfo_lock); 1841 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 1842 err = -ENOBUFS; 1843 else 1844 xfrm_state_afinfo[afinfo->family] = afinfo; 1845 write_unlock_bh(&xfrm_state_afinfo_lock); 1846 return err; 1847} 1848EXPORT_SYMBOL(xfrm_state_register_afinfo); 1849 1850int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 1851{ 1852 int err = 0; 1853 if (unlikely(afinfo == NULL)) 1854 return -EINVAL; 1855 if (unlikely(afinfo->family >= NPROTO)) 1856 return -EAFNOSUPPORT; 1857 write_lock_bh(&xfrm_state_afinfo_lock); 1858 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 1859 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) 1860 err = -EINVAL; 1861 else 1862 xfrm_state_afinfo[afinfo->family] = NULL; 1863 } 1864 write_unlock_bh(&xfrm_state_afinfo_lock); 1865 return err; 1866} 1867EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 1868 1869static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 1870{ 1871 struct xfrm_state_afinfo *afinfo; 1872 if (unlikely(family >= NPROTO)) 1873 return NULL; 1874 read_lock(&xfrm_state_afinfo_lock); 1875 afinfo = xfrm_state_afinfo[family]; 1876 if (unlikely(!afinfo)) 1877 read_unlock(&xfrm_state_afinfo_lock); 1878 return afinfo; 1879} 1880 1881static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) 1882 __releases(xfrm_state_afinfo_lock) 1883{ 1884 read_unlock(&xfrm_state_afinfo_lock); 1885} 1886 1887/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 1888void xfrm_state_delete_tunnel(struct xfrm_state *x) 1889{ 1890 if (x->tunnel) { 1891 struct xfrm_state *t = x->tunnel; 1892 1893 if (atomic_read(&t->tunnel_users) == 2) 1894 xfrm_state_delete(t); 1895 atomic_dec(&t->tunnel_users); 1896 xfrm_state_put(t); 1897 x->tunnel = NULL; 1898 } 1899} 1900EXPORT_SYMBOL(xfrm_state_delete_tunnel); 1901 1902int xfrm_state_mtu(struct xfrm_state *x, int mtu) 1903{ 1904 int res; 1905 1906 spin_lock_bh(&x->lock); 1907 if (x->km.state == XFRM_STATE_VALID && 1908 x->type && x->type->get_mtu) 1909 res = x->type->get_mtu(x, mtu); 1910 else 1911 res = mtu - x->props.header_len; 1912 spin_unlock_bh(&x->lock); 1913 return res; 1914} 1915 1916int __xfrm_init_state(struct xfrm_state *x, bool init_replay) 1917{ 1918 struct xfrm_state_afinfo *afinfo; 1919 struct xfrm_mode *inner_mode; 1920 int family = x->props.family; 1921 int err; 1922 1923 err = -EAFNOSUPPORT; 1924 afinfo = xfrm_state_get_afinfo(family); 1925 if (!afinfo) 1926 goto error; 1927 1928 err = 0; 1929 if (afinfo->init_flags) 1930 err = afinfo->init_flags(x); 1931 1932 xfrm_state_put_afinfo(afinfo); 1933 1934 if (err) 1935 goto error; 1936 1937 err = -EPROTONOSUPPORT; 1938 1939 if (x->sel.family != AF_UNSPEC) { 1940 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 1941 if (inner_mode == NULL) 1942 goto error; 1943 1944 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 1945 family != x->sel.family) { 1946 xfrm_put_mode(inner_mode); 1947 goto error; 1948 } 1949 1950 x->inner_mode = inner_mode; 1951 } else { 1952 struct xfrm_mode *inner_mode_iaf; 1953 int iafamily = AF_INET; 1954 1955 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 1956 if (inner_mode == NULL) 1957 goto error; 1958 1959 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 1960 xfrm_put_mode(inner_mode); 1961 goto error; 1962 } 1963 x->inner_mode = inner_mode; 1964 1965 if (x->props.family == AF_INET) 1966 iafamily = AF_INET6; 1967 1968 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 1969 if (inner_mode_iaf) { 1970 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 1971 x->inner_mode_iaf = inner_mode_iaf; 1972 else 1973 xfrm_put_mode(inner_mode_iaf); 1974 } 1975 } 1976 1977 x->type = xfrm_get_type(x->id.proto, family); 1978 if (x->type == NULL) 1979 goto error; 1980 1981 err = x->type->init_state(x); 1982 if (err) 1983 goto error; 1984 1985 x->outer_mode = xfrm_get_mode(x->props.mode, family); 1986 if (x->outer_mode == NULL) 1987 goto error; 1988 1989 if (init_replay) { 1990 err = xfrm_init_replay(x); 1991 if (err) 1992 goto error; 1993 } 1994 1995 x->km.state = XFRM_STATE_VALID; 1996 1997error: 1998 return err; 1999} 2000 2001EXPORT_SYMBOL(__xfrm_init_state); 2002 2003int xfrm_init_state(struct xfrm_state *x) 2004{ 2005 return __xfrm_init_state(x, true); 2006} 2007 2008EXPORT_SYMBOL(xfrm_init_state); 2009 2010int __net_init xfrm_state_init(struct net *net) 2011{ 2012 unsigned int sz; 2013 2014 INIT_LIST_HEAD(&net->xfrm.state_all); 2015 2016 sz = sizeof(struct hlist_head) * 8; 2017 2018 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2019 if (!net->xfrm.state_bydst) 2020 goto out_bydst; 2021 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2022 if (!net->xfrm.state_bysrc) 2023 goto out_bysrc; 2024 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2025 if (!net->xfrm.state_byspi) 2026 goto out_byspi; 2027 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2028 2029 net->xfrm.state_num = 0; 2030 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2031 INIT_HLIST_HEAD(&net->xfrm.state_gc_list); 2032 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); 2033 init_waitqueue_head(&net->xfrm.km_waitq); 2034 return 0; 2035 2036out_byspi: 2037 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2038out_bysrc: 2039 xfrm_hash_free(net->xfrm.state_bydst, sz); 2040out_bydst: 2041 return -ENOMEM; 2042} 2043 2044void xfrm_state_fini(struct net *net) 2045{ 2046 struct xfrm_audit audit_info; 2047 unsigned int sz; 2048 2049 flush_work(&net->xfrm.state_hash_work); 2050 audit_info.loginuid = -1; 2051 audit_info.sessionid = -1; 2052 audit_info.secid = 0; 2053 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); 2054 flush_work(&net->xfrm.state_gc_work); 2055 2056 WARN_ON(!list_empty(&net->xfrm.state_all)); 2057 2058 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2059 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2060 xfrm_hash_free(net->xfrm.state_byspi, sz); 2061 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2062 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2063 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2064 xfrm_hash_free(net->xfrm.state_bydst, sz); 2065} 2066 2067#ifdef CONFIG_AUDITSYSCALL 2068static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2069 struct audit_buffer *audit_buf) 2070{ 2071 struct xfrm_sec_ctx *ctx = x->security; 2072 u32 spi = ntohl(x->id.spi); 2073 2074 if (ctx) 2075 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2076 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2077 2078 switch(x->props.family) { 2079 case AF_INET: 2080 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2081 &x->props.saddr.a4, &x->id.daddr.a4); 2082 break; 2083 case AF_INET6: 2084 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2085 x->props.saddr.a6, x->id.daddr.a6); 2086 break; 2087 } 2088 2089 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2090} 2091 2092static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2093 struct audit_buffer *audit_buf) 2094{ 2095 const struct iphdr *iph4; 2096 const struct ipv6hdr *iph6; 2097 2098 switch (family) { 2099 case AF_INET: 2100 iph4 = ip_hdr(skb); 2101 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2102 &iph4->saddr, &iph4->daddr); 2103 break; 2104 case AF_INET6: 2105 iph6 = ipv6_hdr(skb); 2106 audit_log_format(audit_buf, 2107 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2108 &iph6->saddr,&iph6->daddr, 2109 iph6->flow_lbl[0] & 0x0f, 2110 iph6->flow_lbl[1], 2111 iph6->flow_lbl[2]); 2112 break; 2113 } 2114} 2115 2116void xfrm_audit_state_add(struct xfrm_state *x, int result, 2117 uid_t auid, u32 sessionid, u32 secid) 2118{ 2119 struct audit_buffer *audit_buf; 2120 2121 audit_buf = xfrm_audit_start("SAD-add"); 2122 if (audit_buf == NULL) 2123 return; 2124 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2125 xfrm_audit_helper_sainfo(x, audit_buf); 2126 audit_log_format(audit_buf, " res=%u", result); 2127 audit_log_end(audit_buf); 2128} 2129EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2130 2131void xfrm_audit_state_delete(struct xfrm_state *x, int result, 2132 uid_t auid, u32 sessionid, u32 secid) 2133{ 2134 struct audit_buffer *audit_buf; 2135 2136 audit_buf = xfrm_audit_start("SAD-delete"); 2137 if (audit_buf == NULL) 2138 return; 2139 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2140 xfrm_audit_helper_sainfo(x, audit_buf); 2141 audit_log_format(audit_buf, " res=%u", result); 2142 audit_log_end(audit_buf); 2143} 2144EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2145 2146void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2147 struct sk_buff *skb) 2148{ 2149 struct audit_buffer *audit_buf; 2150 u32 spi; 2151 2152 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2153 if (audit_buf == NULL) 2154 return; 2155 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2156 /* don't record the sequence number because it's inherent in this kind 2157 * of audit message */ 2158 spi = ntohl(x->id.spi); 2159 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2160 audit_log_end(audit_buf); 2161} 2162EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2163 2164void xfrm_audit_state_replay(struct xfrm_state *x, 2165 struct sk_buff *skb, __be32 net_seq) 2166{ 2167 struct audit_buffer *audit_buf; 2168 u32 spi; 2169 2170 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2171 if (audit_buf == NULL) 2172 return; 2173 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2174 spi = ntohl(x->id.spi); 2175 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2176 spi, spi, ntohl(net_seq)); 2177 audit_log_end(audit_buf); 2178} 2179EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2180 2181void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2182{ 2183 struct audit_buffer *audit_buf; 2184 2185 audit_buf = xfrm_audit_start("SA-notfound"); 2186 if (audit_buf == NULL) 2187 return; 2188 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2189 audit_log_end(audit_buf); 2190} 2191EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2192 2193void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2194 __be32 net_spi, __be32 net_seq) 2195{ 2196 struct audit_buffer *audit_buf; 2197 u32 spi; 2198 2199 audit_buf = xfrm_audit_start("SA-notfound"); 2200 if (audit_buf == NULL) 2201 return; 2202 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2203 spi = ntohl(net_spi); 2204 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2205 spi, spi, ntohl(net_seq)); 2206 audit_log_end(audit_buf); 2207} 2208EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2209 2210void xfrm_audit_state_icvfail(struct xfrm_state *x, 2211 struct sk_buff *skb, u8 proto) 2212{ 2213 struct audit_buffer *audit_buf; 2214 __be32 net_spi; 2215 __be32 net_seq; 2216 2217 audit_buf = xfrm_audit_start("SA-icv-failure"); 2218 if (audit_buf == NULL) 2219 return; 2220 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2221 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2222 u32 spi = ntohl(net_spi); 2223 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2224 spi, spi, ntohl(net_seq)); 2225 } 2226 audit_log_end(audit_buf); 2227} 2228EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2229#endif /* CONFIG_AUDITSYSCALL */ 2230