xfrm_state.c revision a947b0a93efa9a25c012aa88848f4cf8d9b41280
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 *tmp; 76 struct xfrm_state *x; 77 78 hlist_for_each_entry_safe(x, 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_SPINLOCK(xfrm_state_afinfo_lock); 162static struct xfrm_state_afinfo __rcu *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 portid); 170 171static DEFINE_SPINLOCK(xfrm_type_lock); 172int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 173{ 174 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 175 const struct xfrm_type **typemap; 176 int err = 0; 177 178 if (unlikely(afinfo == NULL)) 179 return -EAFNOSUPPORT; 180 typemap = afinfo->type_map; 181 spin_lock_bh(&xfrm_type_lock); 182 183 if (likely(typemap[type->proto] == NULL)) 184 typemap[type->proto] = type; 185 else 186 err = -EEXIST; 187 spin_unlock_bh(&xfrm_type_lock); 188 xfrm_state_put_afinfo(afinfo); 189 return err; 190} 191EXPORT_SYMBOL(xfrm_register_type); 192 193int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 194{ 195 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 196 const struct xfrm_type **typemap; 197 int err = 0; 198 199 if (unlikely(afinfo == NULL)) 200 return -EAFNOSUPPORT; 201 typemap = afinfo->type_map; 202 spin_lock_bh(&xfrm_type_lock); 203 204 if (unlikely(typemap[type->proto] != type)) 205 err = -ENOENT; 206 else 207 typemap[type->proto] = NULL; 208 spin_unlock_bh(&xfrm_type_lock); 209 xfrm_state_put_afinfo(afinfo); 210 return err; 211} 212EXPORT_SYMBOL(xfrm_unregister_type); 213 214static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 215{ 216 struct xfrm_state_afinfo *afinfo; 217 const struct xfrm_type **typemap; 218 const struct xfrm_type *type; 219 int modload_attempted = 0; 220 221retry: 222 afinfo = xfrm_state_get_afinfo(family); 223 if (unlikely(afinfo == NULL)) 224 return NULL; 225 typemap = afinfo->type_map; 226 227 type = typemap[proto]; 228 if (unlikely(type && !try_module_get(type->owner))) 229 type = NULL; 230 if (!type && !modload_attempted) { 231 xfrm_state_put_afinfo(afinfo); 232 request_module("xfrm-type-%d-%d", family, proto); 233 modload_attempted = 1; 234 goto retry; 235 } 236 237 xfrm_state_put_afinfo(afinfo); 238 return type; 239} 240 241static void xfrm_put_type(const struct xfrm_type *type) 242{ 243 module_put(type->owner); 244} 245 246static DEFINE_SPINLOCK(xfrm_mode_lock); 247int xfrm_register_mode(struct xfrm_mode *mode, int family) 248{ 249 struct xfrm_state_afinfo *afinfo; 250 struct xfrm_mode **modemap; 251 int err; 252 253 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 254 return -EINVAL; 255 256 afinfo = xfrm_state_get_afinfo(family); 257 if (unlikely(afinfo == NULL)) 258 return -EAFNOSUPPORT; 259 260 err = -EEXIST; 261 modemap = afinfo->mode_map; 262 spin_lock_bh(&xfrm_mode_lock); 263 if (modemap[mode->encap]) 264 goto out; 265 266 err = -ENOENT; 267 if (!try_module_get(afinfo->owner)) 268 goto out; 269 270 mode->afinfo = afinfo; 271 modemap[mode->encap] = mode; 272 err = 0; 273 274out: 275 spin_unlock_bh(&xfrm_mode_lock); 276 xfrm_state_put_afinfo(afinfo); 277 return err; 278} 279EXPORT_SYMBOL(xfrm_register_mode); 280 281int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 282{ 283 struct xfrm_state_afinfo *afinfo; 284 struct xfrm_mode **modemap; 285 int err; 286 287 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 288 return -EINVAL; 289 290 afinfo = xfrm_state_get_afinfo(family); 291 if (unlikely(afinfo == NULL)) 292 return -EAFNOSUPPORT; 293 294 err = -ENOENT; 295 modemap = afinfo->mode_map; 296 spin_lock_bh(&xfrm_mode_lock); 297 if (likely(modemap[mode->encap] == mode)) { 298 modemap[mode->encap] = NULL; 299 module_put(mode->afinfo->owner); 300 err = 0; 301 } 302 303 spin_unlock_bh(&xfrm_mode_lock); 304 xfrm_state_put_afinfo(afinfo); 305 return err; 306} 307EXPORT_SYMBOL(xfrm_unregister_mode); 308 309static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 310{ 311 struct xfrm_state_afinfo *afinfo; 312 struct xfrm_mode *mode; 313 int modload_attempted = 0; 314 315 if (unlikely(encap >= XFRM_MODE_MAX)) 316 return NULL; 317 318retry: 319 afinfo = xfrm_state_get_afinfo(family); 320 if (unlikely(afinfo == NULL)) 321 return NULL; 322 323 mode = afinfo->mode_map[encap]; 324 if (unlikely(mode && !try_module_get(mode->owner))) 325 mode = NULL; 326 if (!mode && !modload_attempted) { 327 xfrm_state_put_afinfo(afinfo); 328 request_module("xfrm-mode-%d-%d", family, encap); 329 modload_attempted = 1; 330 goto retry; 331 } 332 333 xfrm_state_put_afinfo(afinfo); 334 return mode; 335} 336 337static void xfrm_put_mode(struct xfrm_mode *mode) 338{ 339 module_put(mode->owner); 340} 341 342static void xfrm_state_gc_destroy(struct xfrm_state *x) 343{ 344 tasklet_hrtimer_cancel(&x->mtimer); 345 del_timer_sync(&x->rtimer); 346 kfree(x->aalg); 347 kfree(x->ealg); 348 kfree(x->calg); 349 kfree(x->encap); 350 kfree(x->coaddr); 351 kfree(x->replay_esn); 352 kfree(x->preplay_esn); 353 if (x->inner_mode) 354 xfrm_put_mode(x->inner_mode); 355 if (x->inner_mode_iaf) 356 xfrm_put_mode(x->inner_mode_iaf); 357 if (x->outer_mode) 358 xfrm_put_mode(x->outer_mode); 359 if (x->type) { 360 x->type->destructor(x); 361 xfrm_put_type(x->type); 362 } 363 security_xfrm_state_free(x); 364 kfree(x); 365} 366 367static void xfrm_state_gc_task(struct work_struct *work) 368{ 369 struct net *net = container_of(work, struct net, xfrm.state_gc_work); 370 struct xfrm_state *x; 371 struct hlist_node *tmp; 372 struct hlist_head gc_list; 373 374 spin_lock_bh(&xfrm_state_gc_lock); 375 hlist_move_list(&net->xfrm.state_gc_list, &gc_list); 376 spin_unlock_bh(&xfrm_state_gc_lock); 377 378 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 379 xfrm_state_gc_destroy(x); 380 381 wake_up(&net->xfrm.km_waitq); 382} 383 384static inline unsigned long make_jiffies(long secs) 385{ 386 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) 387 return MAX_SCHEDULE_TIMEOUT-1; 388 else 389 return secs*HZ; 390} 391 392static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) 393{ 394 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 395 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 396 struct net *net = xs_net(x); 397 unsigned long now = get_seconds(); 398 long next = LONG_MAX; 399 int warn = 0; 400 int err = 0; 401 402 spin_lock(&x->lock); 403 if (x->km.state == XFRM_STATE_DEAD) 404 goto out; 405 if (x->km.state == XFRM_STATE_EXPIRED) 406 goto expired; 407 if (x->lft.hard_add_expires_seconds) { 408 long tmo = x->lft.hard_add_expires_seconds + 409 x->curlft.add_time - now; 410 if (tmo <= 0) { 411 if (x->xflags & XFRM_SOFT_EXPIRE) { 412 /* enter hard expire without soft expire first?! 413 * setting a new date could trigger this. 414 * workarbound: fix x->curflt.add_time by below: 415 */ 416 x->curlft.add_time = now - x->saved_tmo - 1; 417 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 418 } else 419 goto expired; 420 } 421 if (tmo < next) 422 next = tmo; 423 } 424 if (x->lft.hard_use_expires_seconds) { 425 long tmo = x->lft.hard_use_expires_seconds + 426 (x->curlft.use_time ? : now) - now; 427 if (tmo <= 0) 428 goto expired; 429 if (tmo < next) 430 next = tmo; 431 } 432 if (x->km.dying) 433 goto resched; 434 if (x->lft.soft_add_expires_seconds) { 435 long tmo = x->lft.soft_add_expires_seconds + 436 x->curlft.add_time - now; 437 if (tmo <= 0) { 438 warn = 1; 439 x->xflags &= ~XFRM_SOFT_EXPIRE; 440 } else if (tmo < next) { 441 next = tmo; 442 x->xflags |= XFRM_SOFT_EXPIRE; 443 x->saved_tmo = tmo; 444 } 445 } 446 if (x->lft.soft_use_expires_seconds) { 447 long tmo = x->lft.soft_use_expires_seconds + 448 (x->curlft.use_time ? : now) - now; 449 if (tmo <= 0) 450 warn = 1; 451 else if (tmo < next) 452 next = tmo; 453 } 454 455 x->km.dying = warn; 456 if (warn) 457 km_state_expired(x, 0, 0); 458resched: 459 if (next != LONG_MAX){ 460 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 461 } 462 463 goto out; 464 465expired: 466 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { 467 x->km.state = XFRM_STATE_EXPIRED; 468 wake_up(&net->xfrm.km_waitq); 469 next = 2; 470 goto resched; 471 } 472 473 err = __xfrm_state_delete(x); 474 if (!err && x->id.spi) 475 km_state_expired(x, 1, 0); 476 477 xfrm_audit_state_delete(x, err ? 0 : 1, 478 audit_get_loginuid(current), 479 audit_get_sessionid(current), 0); 480 481out: 482 spin_unlock(&x->lock); 483 return HRTIMER_NORESTART; 484} 485 486static void xfrm_replay_timer_handler(unsigned long data); 487 488struct xfrm_state *xfrm_state_alloc(struct net *net) 489{ 490 struct xfrm_state *x; 491 492 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 493 494 if (x) { 495 write_pnet(&x->xs_net, net); 496 atomic_set(&x->refcnt, 1); 497 atomic_set(&x->tunnel_users, 0); 498 INIT_LIST_HEAD(&x->km.all); 499 INIT_HLIST_NODE(&x->bydst); 500 INIT_HLIST_NODE(&x->bysrc); 501 INIT_HLIST_NODE(&x->byspi); 502 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); 503 setup_timer(&x->rtimer, xfrm_replay_timer_handler, 504 (unsigned long)x); 505 x->curlft.add_time = get_seconds(); 506 x->lft.soft_byte_limit = XFRM_INF; 507 x->lft.soft_packet_limit = XFRM_INF; 508 x->lft.hard_byte_limit = XFRM_INF; 509 x->lft.hard_packet_limit = XFRM_INF; 510 x->replay_maxage = 0; 511 x->replay_maxdiff = 0; 512 x->inner_mode = NULL; 513 x->inner_mode_iaf = NULL; 514 spin_lock_init(&x->lock); 515 } 516 return x; 517} 518EXPORT_SYMBOL(xfrm_state_alloc); 519 520void __xfrm_state_destroy(struct xfrm_state *x) 521{ 522 struct net *net = xs_net(x); 523 524 WARN_ON(x->km.state != XFRM_STATE_DEAD); 525 526 spin_lock_bh(&xfrm_state_gc_lock); 527 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); 528 spin_unlock_bh(&xfrm_state_gc_lock); 529 schedule_work(&net->xfrm.state_gc_work); 530} 531EXPORT_SYMBOL(__xfrm_state_destroy); 532 533int __xfrm_state_delete(struct xfrm_state *x) 534{ 535 struct net *net = xs_net(x); 536 int err = -ESRCH; 537 538 if (x->km.state != XFRM_STATE_DEAD) { 539 x->km.state = XFRM_STATE_DEAD; 540 spin_lock(&xfrm_state_lock); 541 list_del(&x->km.all); 542 hlist_del(&x->bydst); 543 hlist_del(&x->bysrc); 544 if (x->id.spi) 545 hlist_del(&x->byspi); 546 net->xfrm.state_num--; 547 spin_unlock(&xfrm_state_lock); 548 549 /* All xfrm_state objects are created by xfrm_state_alloc. 550 * The xfrm_state_alloc call gives a reference, and that 551 * is what we are dropping here. 552 */ 553 xfrm_state_put(x); 554 err = 0; 555 } 556 557 return err; 558} 559EXPORT_SYMBOL(__xfrm_state_delete); 560 561int xfrm_state_delete(struct xfrm_state *x) 562{ 563 int err; 564 565 spin_lock_bh(&x->lock); 566 err = __xfrm_state_delete(x); 567 spin_unlock_bh(&x->lock); 568 569 return err; 570} 571EXPORT_SYMBOL(xfrm_state_delete); 572 573#ifdef CONFIG_SECURITY_NETWORK_XFRM 574static inline int 575xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 576{ 577 int i, err = 0; 578 579 for (i = 0; i <= net->xfrm.state_hmask; i++) { 580 struct xfrm_state *x; 581 582 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 583 if (xfrm_id_proto_match(x->id.proto, proto) && 584 (err = security_xfrm_state_delete(x)) != 0) { 585 xfrm_audit_state_delete(x, 0, 586 audit_info->loginuid, 587 audit_info->sessionid, 588 audit_info->secid); 589 return err; 590 } 591 } 592 } 593 594 return err; 595} 596#else 597static inline int 598xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 599{ 600 return 0; 601} 602#endif 603 604int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) 605{ 606 int i, err = 0, cnt = 0; 607 608 spin_lock_bh(&xfrm_state_lock); 609 err = xfrm_state_flush_secctx_check(net, proto, audit_info); 610 if (err) 611 goto out; 612 613 err = -ESRCH; 614 for (i = 0; i <= net->xfrm.state_hmask; i++) { 615 struct xfrm_state *x; 616restart: 617 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 618 if (!xfrm_state_kern(x) && 619 xfrm_id_proto_match(x->id.proto, proto)) { 620 xfrm_state_hold(x); 621 spin_unlock_bh(&xfrm_state_lock); 622 623 err = xfrm_state_delete(x); 624 xfrm_audit_state_delete(x, err ? 0 : 1, 625 audit_info->loginuid, 626 audit_info->sessionid, 627 audit_info->secid); 628 xfrm_state_put(x); 629 if (!err) 630 cnt++; 631 632 spin_lock_bh(&xfrm_state_lock); 633 goto restart; 634 } 635 } 636 } 637 if (cnt) 638 err = 0; 639 640out: 641 spin_unlock_bh(&xfrm_state_lock); 642 wake_up(&net->xfrm.km_waitq); 643 return err; 644} 645EXPORT_SYMBOL(xfrm_state_flush); 646 647void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 648{ 649 spin_lock_bh(&xfrm_state_lock); 650 si->sadcnt = net->xfrm.state_num; 651 si->sadhcnt = net->xfrm.state_hmask; 652 si->sadhmcnt = xfrm_state_hashmax; 653 spin_unlock_bh(&xfrm_state_lock); 654} 655EXPORT_SYMBOL(xfrm_sad_getinfo); 656 657static int 658xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 659 const struct xfrm_tmpl *tmpl, 660 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 661 unsigned short family) 662{ 663 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 664 if (!afinfo) 665 return -1; 666 afinfo->init_tempsel(&x->sel, fl); 667 668 if (family != tmpl->encap_family) { 669 xfrm_state_put_afinfo(afinfo); 670 afinfo = xfrm_state_get_afinfo(tmpl->encap_family); 671 if (!afinfo) 672 return -1; 673 } 674 afinfo->init_temprop(x, tmpl, daddr, saddr); 675 xfrm_state_put_afinfo(afinfo); 676 return 0; 677} 678 679static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 680 const xfrm_address_t *daddr, 681 __be32 spi, u8 proto, 682 unsigned short family) 683{ 684 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 685 struct xfrm_state *x; 686 687 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) { 688 if (x->props.family != family || 689 x->id.spi != spi || 690 x->id.proto != proto || 691 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 692 continue; 693 694 if ((mark & x->mark.m) != x->mark.v) 695 continue; 696 xfrm_state_hold(x); 697 return x; 698 } 699 700 return NULL; 701} 702 703static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 704 const xfrm_address_t *daddr, 705 const xfrm_address_t *saddr, 706 u8 proto, unsigned short family) 707{ 708 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 709 struct xfrm_state *x; 710 711 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 712 if (x->props.family != family || 713 x->id.proto != proto || 714 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 715 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 716 continue; 717 718 if ((mark & x->mark.m) != x->mark.v) 719 continue; 720 xfrm_state_hold(x); 721 return x; 722 } 723 724 return NULL; 725} 726 727static inline struct xfrm_state * 728__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 729{ 730 struct net *net = xs_net(x); 731 u32 mark = x->mark.v & x->mark.m; 732 733 if (use_spi) 734 return __xfrm_state_lookup(net, mark, &x->id.daddr, 735 x->id.spi, x->id.proto, family); 736 else 737 return __xfrm_state_lookup_byaddr(net, mark, 738 &x->id.daddr, 739 &x->props.saddr, 740 x->id.proto, family); 741} 742 743static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 744{ 745 if (have_hash_collision && 746 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 747 net->xfrm.state_num > net->xfrm.state_hmask) 748 schedule_work(&net->xfrm.state_hash_work); 749} 750 751static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 752 const struct flowi *fl, unsigned short family, 753 struct xfrm_state **best, int *acq_in_progress, 754 int *error) 755{ 756 /* Resolution logic: 757 * 1. There is a valid state with matching selector. Done. 758 * 2. Valid state with inappropriate selector. Skip. 759 * 760 * Entering area of "sysdeps". 761 * 762 * 3. If state is not valid, selector is temporary, it selects 763 * only session which triggered previous resolution. Key 764 * manager will do something to install a state with proper 765 * selector. 766 */ 767 if (x->km.state == XFRM_STATE_VALID) { 768 if ((x->sel.family && 769 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 770 !security_xfrm_state_pol_flow_match(x, pol, fl)) 771 return; 772 773 if (!*best || 774 (*best)->km.dying > x->km.dying || 775 ((*best)->km.dying == x->km.dying && 776 (*best)->curlft.add_time < x->curlft.add_time)) 777 *best = x; 778 } else if (x->km.state == XFRM_STATE_ACQ) { 779 *acq_in_progress = 1; 780 } else if (x->km.state == XFRM_STATE_ERROR || 781 x->km.state == XFRM_STATE_EXPIRED) { 782 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 783 security_xfrm_state_pol_flow_match(x, pol, fl)) 784 *error = -ESRCH; 785 } 786} 787 788struct xfrm_state * 789xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 790 const struct flowi *fl, struct xfrm_tmpl *tmpl, 791 struct xfrm_policy *pol, int *err, 792 unsigned short family) 793{ 794 static xfrm_address_t saddr_wildcard = { }; 795 struct net *net = xp_net(pol); 796 unsigned int h, h_wildcard; 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, 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, 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; 904 905 spin_lock(&xfrm_state_lock); 906 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 907 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 908 if (x->props.family == family && 909 x->props.reqid == reqid && 910 (mark & x->mark.m) == x->mark.v && 911 !(x->props.flags & XFRM_STATE_WILDRECV) && 912 xfrm_state_addr_check(x, daddr, saddr, family) && 913 mode == x->props.mode && 914 proto == x->id.proto && 915 x->km.state == XFRM_STATE_VALID) { 916 rx = x; 917 break; 918 } 919 } 920 921 if (rx) 922 xfrm_state_hold(rx); 923 spin_unlock(&xfrm_state_lock); 924 925 926 return rx; 927} 928EXPORT_SYMBOL(xfrm_stateonly_find); 929 930static void __xfrm_state_insert(struct xfrm_state *x) 931{ 932 struct net *net = xs_net(x); 933 unsigned int h; 934 935 list_add(&x->km.all, &net->xfrm.state_all); 936 937 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 938 x->props.reqid, x->props.family); 939 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 940 941 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 942 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 943 944 if (x->id.spi) { 945 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 946 x->props.family); 947 948 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 949 } 950 951 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 952 if (x->replay_maxage) 953 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 954 955 wake_up(&net->xfrm.km_waitq); 956 957 net->xfrm.state_num++; 958 959 xfrm_hash_grow_check(net, x->bydst.next != NULL); 960} 961 962/* xfrm_state_lock is held */ 963static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 964{ 965 struct net *net = xs_net(xnew); 966 unsigned short family = xnew->props.family; 967 u32 reqid = xnew->props.reqid; 968 struct xfrm_state *x; 969 unsigned int h; 970 u32 mark = xnew->mark.v & xnew->mark.m; 971 972 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 973 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 974 if (x->props.family == family && 975 x->props.reqid == reqid && 976 (mark & x->mark.m) == x->mark.v && 977 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 978 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 979 x->genid++; 980 } 981} 982 983void xfrm_state_insert(struct xfrm_state *x) 984{ 985 spin_lock_bh(&xfrm_state_lock); 986 __xfrm_state_bump_genids(x); 987 __xfrm_state_insert(x); 988 spin_unlock_bh(&xfrm_state_lock); 989} 990EXPORT_SYMBOL(xfrm_state_insert); 991 992/* xfrm_state_lock is held */ 993static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, 994 unsigned short family, u8 mode, 995 u32 reqid, u8 proto, 996 const xfrm_address_t *daddr, 997 const xfrm_address_t *saddr, int create) 998{ 999 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1000 struct xfrm_state *x; 1001 u32 mark = m->v & m->m; 1002 1003 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1004 if (x->props.reqid != reqid || 1005 x->props.mode != mode || 1006 x->props.family != family || 1007 x->km.state != XFRM_STATE_ACQ || 1008 x->id.spi != 0 || 1009 x->id.proto != proto || 1010 (mark & x->mark.m) != x->mark.v || 1011 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1012 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1013 continue; 1014 1015 xfrm_state_hold(x); 1016 return x; 1017 } 1018 1019 if (!create) 1020 return NULL; 1021 1022 x = xfrm_state_alloc(net); 1023 if (likely(x)) { 1024 switch (family) { 1025 case AF_INET: 1026 x->sel.daddr.a4 = daddr->a4; 1027 x->sel.saddr.a4 = saddr->a4; 1028 x->sel.prefixlen_d = 32; 1029 x->sel.prefixlen_s = 32; 1030 x->props.saddr.a4 = saddr->a4; 1031 x->id.daddr.a4 = daddr->a4; 1032 break; 1033 1034 case AF_INET6: 1035 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr; 1036 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr; 1037 x->sel.prefixlen_d = 128; 1038 x->sel.prefixlen_s = 128; 1039 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr; 1040 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr; 1041 break; 1042 } 1043 1044 x->km.state = XFRM_STATE_ACQ; 1045 x->id.proto = proto; 1046 x->props.family = family; 1047 x->props.mode = mode; 1048 x->props.reqid = reqid; 1049 x->mark.v = m->v; 1050 x->mark.m = m->m; 1051 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1052 xfrm_state_hold(x); 1053 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1054 list_add(&x->km.all, &net->xfrm.state_all); 1055 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 1056 h = xfrm_src_hash(net, daddr, saddr, family); 1057 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 1058 1059 net->xfrm.state_num++; 1060 1061 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1062 } 1063 1064 return x; 1065} 1066 1067static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1068 1069int xfrm_state_add(struct xfrm_state *x) 1070{ 1071 struct net *net = xs_net(x); 1072 struct xfrm_state *x1, *to_put; 1073 int family; 1074 int err; 1075 u32 mark = x->mark.v & x->mark.m; 1076 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1077 1078 family = x->props.family; 1079 1080 to_put = NULL; 1081 1082 spin_lock_bh(&xfrm_state_lock); 1083 1084 x1 = __xfrm_state_locate(x, use_spi, family); 1085 if (x1) { 1086 to_put = x1; 1087 x1 = NULL; 1088 err = -EEXIST; 1089 goto out; 1090 } 1091 1092 if (use_spi && x->km.seq) { 1093 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1094 if (x1 && ((x1->id.proto != x->id.proto) || 1095 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1096 to_put = x1; 1097 x1 = NULL; 1098 } 1099 } 1100 1101 if (use_spi && !x1) 1102 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1103 x->props.reqid, x->id.proto, 1104 &x->id.daddr, &x->props.saddr, 0); 1105 1106 __xfrm_state_bump_genids(x); 1107 __xfrm_state_insert(x); 1108 err = 0; 1109 1110out: 1111 spin_unlock_bh(&xfrm_state_lock); 1112 1113 if (x1) { 1114 xfrm_state_delete(x1); 1115 xfrm_state_put(x1); 1116 } 1117 1118 if (to_put) 1119 xfrm_state_put(to_put); 1120 1121 return err; 1122} 1123EXPORT_SYMBOL(xfrm_state_add); 1124 1125#ifdef CONFIG_XFRM_MIGRATE 1126static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) 1127{ 1128 struct net *net = xs_net(orig); 1129 int err = -ENOMEM; 1130 struct xfrm_state *x = xfrm_state_alloc(net); 1131 if (!x) 1132 goto out; 1133 1134 memcpy(&x->id, &orig->id, sizeof(x->id)); 1135 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1136 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1137 x->props.mode = orig->props.mode; 1138 x->props.replay_window = orig->props.replay_window; 1139 x->props.reqid = orig->props.reqid; 1140 x->props.family = orig->props.family; 1141 x->props.saddr = orig->props.saddr; 1142 1143 if (orig->aalg) { 1144 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1145 if (!x->aalg) 1146 goto error; 1147 } 1148 x->props.aalgo = orig->props.aalgo; 1149 1150 if (orig->ealg) { 1151 x->ealg = xfrm_algo_clone(orig->ealg); 1152 if (!x->ealg) 1153 goto error; 1154 } 1155 x->props.ealgo = orig->props.ealgo; 1156 1157 if (orig->calg) { 1158 x->calg = xfrm_algo_clone(orig->calg); 1159 if (!x->calg) 1160 goto error; 1161 } 1162 x->props.calgo = orig->props.calgo; 1163 1164 if (orig->encap) { 1165 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); 1166 if (!x->encap) 1167 goto error; 1168 } 1169 1170 if (orig->coaddr) { 1171 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1172 GFP_KERNEL); 1173 if (!x->coaddr) 1174 goto error; 1175 } 1176 1177 if (orig->replay_esn) { 1178 err = xfrm_replay_clone(x, orig); 1179 if (err) 1180 goto error; 1181 } 1182 1183 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1184 1185 err = xfrm_init_state(x); 1186 if (err) 1187 goto error; 1188 1189 x->props.flags = orig->props.flags; 1190 x->props.extra_flags = orig->props.extra_flags; 1191 1192 x->curlft.add_time = orig->curlft.add_time; 1193 x->km.state = orig->km.state; 1194 x->km.seq = orig->km.seq; 1195 1196 return x; 1197 1198 error: 1199 xfrm_state_put(x); 1200out: 1201 if (errp) 1202 *errp = err; 1203 return NULL; 1204} 1205 1206/* xfrm_state_lock is held */ 1207struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) 1208{ 1209 unsigned int h; 1210 struct xfrm_state *x; 1211 1212 if (m->reqid) { 1213 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, 1214 m->reqid, m->old_family); 1215 hlist_for_each_entry(x, init_net.xfrm.state_bydst+h, bydst) { 1216 if (x->props.mode != m->mode || 1217 x->id.proto != m->proto) 1218 continue; 1219 if (m->reqid && x->props.reqid != m->reqid) 1220 continue; 1221 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1222 m->old_family) || 1223 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1224 m->old_family)) 1225 continue; 1226 xfrm_state_hold(x); 1227 return x; 1228 } 1229 } else { 1230 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, 1231 m->old_family); 1232 hlist_for_each_entry(x, init_net.xfrm.state_bysrc+h, bysrc) { 1233 if (x->props.mode != m->mode || 1234 x->id.proto != m->proto) 1235 continue; 1236 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1237 m->old_family) || 1238 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1239 m->old_family)) 1240 continue; 1241 xfrm_state_hold(x); 1242 return x; 1243 } 1244 } 1245 1246 return NULL; 1247} 1248EXPORT_SYMBOL(xfrm_migrate_state_find); 1249 1250struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1251 struct xfrm_migrate *m) 1252{ 1253 struct xfrm_state *xc; 1254 int err; 1255 1256 xc = xfrm_state_clone(x, &err); 1257 if (!xc) 1258 return NULL; 1259 1260 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1261 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1262 1263 /* add state */ 1264 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1265 /* a care is needed when the destination address of the 1266 state is to be updated as it is a part of triplet */ 1267 xfrm_state_insert(xc); 1268 } else { 1269 if ((err = xfrm_state_add(xc)) < 0) 1270 goto error; 1271 } 1272 1273 return xc; 1274error: 1275 xfrm_state_put(xc); 1276 return NULL; 1277} 1278EXPORT_SYMBOL(xfrm_state_migrate); 1279#endif 1280 1281int xfrm_state_update(struct xfrm_state *x) 1282{ 1283 struct xfrm_state *x1, *to_put; 1284 int err; 1285 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1286 1287 to_put = NULL; 1288 1289 spin_lock_bh(&xfrm_state_lock); 1290 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1291 1292 err = -ESRCH; 1293 if (!x1) 1294 goto out; 1295 1296 if (xfrm_state_kern(x1)) { 1297 to_put = x1; 1298 err = -EEXIST; 1299 goto out; 1300 } 1301 1302 if (x1->km.state == XFRM_STATE_ACQ) { 1303 __xfrm_state_insert(x); 1304 x = NULL; 1305 } 1306 err = 0; 1307 1308out: 1309 spin_unlock_bh(&xfrm_state_lock); 1310 1311 if (to_put) 1312 xfrm_state_put(to_put); 1313 1314 if (err) 1315 return err; 1316 1317 if (!x) { 1318 xfrm_state_delete(x1); 1319 xfrm_state_put(x1); 1320 return 0; 1321 } 1322 1323 err = -EINVAL; 1324 spin_lock_bh(&x1->lock); 1325 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1326 if (x->encap && x1->encap) 1327 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1328 if (x->coaddr && x1->coaddr) { 1329 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1330 } 1331 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1332 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1333 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1334 x1->km.dying = 0; 1335 1336 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1337 if (x1->curlft.use_time) 1338 xfrm_state_check_expire(x1); 1339 1340 err = 0; 1341 x->km.state = XFRM_STATE_DEAD; 1342 __xfrm_state_put(x); 1343 } 1344 spin_unlock_bh(&x1->lock); 1345 1346 xfrm_state_put(x1); 1347 1348 return err; 1349} 1350EXPORT_SYMBOL(xfrm_state_update); 1351 1352int xfrm_state_check_expire(struct xfrm_state *x) 1353{ 1354 if (!x->curlft.use_time) 1355 x->curlft.use_time = get_seconds(); 1356 1357 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1358 x->curlft.packets >= x->lft.hard_packet_limit) { 1359 x->km.state = XFRM_STATE_EXPIRED; 1360 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); 1361 return -EINVAL; 1362 } 1363 1364 if (!x->km.dying && 1365 (x->curlft.bytes >= x->lft.soft_byte_limit || 1366 x->curlft.packets >= x->lft.soft_packet_limit)) { 1367 x->km.dying = 1; 1368 km_state_expired(x, 0, 0); 1369 } 1370 return 0; 1371} 1372EXPORT_SYMBOL(xfrm_state_check_expire); 1373 1374struct xfrm_state * 1375xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1376 u8 proto, unsigned short family) 1377{ 1378 struct xfrm_state *x; 1379 1380 spin_lock_bh(&xfrm_state_lock); 1381 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1382 spin_unlock_bh(&xfrm_state_lock); 1383 return x; 1384} 1385EXPORT_SYMBOL(xfrm_state_lookup); 1386 1387struct xfrm_state * 1388xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1389 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1390 u8 proto, unsigned short family) 1391{ 1392 struct xfrm_state *x; 1393 1394 spin_lock_bh(&xfrm_state_lock); 1395 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1396 spin_unlock_bh(&xfrm_state_lock); 1397 return x; 1398} 1399EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1400 1401struct xfrm_state * 1402xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, 1403 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1404 int create, unsigned short family) 1405{ 1406 struct xfrm_state *x; 1407 1408 spin_lock_bh(&xfrm_state_lock); 1409 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1410 spin_unlock_bh(&xfrm_state_lock); 1411 1412 return x; 1413} 1414EXPORT_SYMBOL(xfrm_find_acq); 1415 1416#ifdef CONFIG_XFRM_SUB_POLICY 1417int 1418xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1419 unsigned short family) 1420{ 1421 int err = 0; 1422 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1423 if (!afinfo) 1424 return -EAFNOSUPPORT; 1425 1426 spin_lock_bh(&xfrm_state_lock); 1427 if (afinfo->tmpl_sort) 1428 err = afinfo->tmpl_sort(dst, src, n); 1429 spin_unlock_bh(&xfrm_state_lock); 1430 xfrm_state_put_afinfo(afinfo); 1431 return err; 1432} 1433EXPORT_SYMBOL(xfrm_tmpl_sort); 1434 1435int 1436xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1437 unsigned short family) 1438{ 1439 int err = 0; 1440 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1441 if (!afinfo) 1442 return -EAFNOSUPPORT; 1443 1444 spin_lock_bh(&xfrm_state_lock); 1445 if (afinfo->state_sort) 1446 err = afinfo->state_sort(dst, src, n); 1447 spin_unlock_bh(&xfrm_state_lock); 1448 xfrm_state_put_afinfo(afinfo); 1449 return err; 1450} 1451EXPORT_SYMBOL(xfrm_state_sort); 1452#endif 1453 1454/* Silly enough, but I'm lazy to build resolution list */ 1455 1456static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1457{ 1458 int i; 1459 1460 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1461 struct xfrm_state *x; 1462 1463 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1464 if (x->km.seq == seq && 1465 (mark & x->mark.m) == x->mark.v && 1466 x->km.state == XFRM_STATE_ACQ) { 1467 xfrm_state_hold(x); 1468 return x; 1469 } 1470 } 1471 } 1472 return NULL; 1473} 1474 1475struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1476{ 1477 struct xfrm_state *x; 1478 1479 spin_lock_bh(&xfrm_state_lock); 1480 x = __xfrm_find_acq_byseq(net, mark, seq); 1481 spin_unlock_bh(&xfrm_state_lock); 1482 return x; 1483} 1484EXPORT_SYMBOL(xfrm_find_acq_byseq); 1485 1486u32 xfrm_get_acqseq(void) 1487{ 1488 u32 res; 1489 static atomic_t acqseq; 1490 1491 do { 1492 res = atomic_inc_return(&acqseq); 1493 } while (!res); 1494 1495 return res; 1496} 1497EXPORT_SYMBOL(xfrm_get_acqseq); 1498 1499int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1500{ 1501 struct net *net = xs_net(x); 1502 unsigned int h; 1503 struct xfrm_state *x0; 1504 int err = -ENOENT; 1505 __be32 minspi = htonl(low); 1506 __be32 maxspi = htonl(high); 1507 u32 mark = x->mark.v & x->mark.m; 1508 1509 spin_lock_bh(&x->lock); 1510 if (x->km.state == XFRM_STATE_DEAD) 1511 goto unlock; 1512 1513 err = 0; 1514 if (x->id.spi) 1515 goto unlock; 1516 1517 err = -ENOENT; 1518 1519 if (minspi == maxspi) { 1520 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1521 if (x0) { 1522 xfrm_state_put(x0); 1523 goto unlock; 1524 } 1525 x->id.spi = minspi; 1526 } else { 1527 u32 spi = 0; 1528 for (h=0; h<high-low+1; h++) { 1529 spi = low + net_random()%(high-low+1); 1530 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1531 if (x0 == NULL) { 1532 x->id.spi = htonl(spi); 1533 break; 1534 } 1535 xfrm_state_put(x0); 1536 } 1537 } 1538 if (x->id.spi) { 1539 spin_lock_bh(&xfrm_state_lock); 1540 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1541 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 1542 spin_unlock_bh(&xfrm_state_lock); 1543 1544 err = 0; 1545 } 1546 1547unlock: 1548 spin_unlock_bh(&x->lock); 1549 1550 return err; 1551} 1552EXPORT_SYMBOL(xfrm_alloc_spi); 1553 1554int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1555 int (*func)(struct xfrm_state *, int, void*), 1556 void *data) 1557{ 1558 struct xfrm_state *state; 1559 struct xfrm_state_walk *x; 1560 int err = 0; 1561 1562 if (walk->seq != 0 && list_empty(&walk->all)) 1563 return 0; 1564 1565 spin_lock_bh(&xfrm_state_lock); 1566 if (list_empty(&walk->all)) 1567 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1568 else 1569 x = list_entry(&walk->all, struct xfrm_state_walk, all); 1570 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1571 if (x->state == XFRM_STATE_DEAD) 1572 continue; 1573 state = container_of(x, struct xfrm_state, km); 1574 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1575 continue; 1576 err = func(state, walk->seq, data); 1577 if (err) { 1578 list_move_tail(&walk->all, &x->all); 1579 goto out; 1580 } 1581 walk->seq++; 1582 } 1583 if (walk->seq == 0) { 1584 err = -ENOENT; 1585 goto out; 1586 } 1587 list_del_init(&walk->all); 1588out: 1589 spin_unlock_bh(&xfrm_state_lock); 1590 return err; 1591} 1592EXPORT_SYMBOL(xfrm_state_walk); 1593 1594void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1595{ 1596 INIT_LIST_HEAD(&walk->all); 1597 walk->proto = proto; 1598 walk->state = XFRM_STATE_DEAD; 1599 walk->seq = 0; 1600} 1601EXPORT_SYMBOL(xfrm_state_walk_init); 1602 1603void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1604{ 1605 if (list_empty(&walk->all)) 1606 return; 1607 1608 spin_lock_bh(&xfrm_state_lock); 1609 list_del(&walk->all); 1610 spin_unlock_bh(&xfrm_state_lock); 1611} 1612EXPORT_SYMBOL(xfrm_state_walk_done); 1613 1614static void xfrm_replay_timer_handler(unsigned long data) 1615{ 1616 struct xfrm_state *x = (struct xfrm_state*)data; 1617 1618 spin_lock(&x->lock); 1619 1620 if (x->km.state == XFRM_STATE_VALID) { 1621 if (xfrm_aevent_is_on(xs_net(x))) 1622 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1623 else 1624 x->xflags |= XFRM_TIME_DEFER; 1625 } 1626 1627 spin_unlock(&x->lock); 1628} 1629 1630static LIST_HEAD(xfrm_km_list); 1631 1632void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1633{ 1634 struct xfrm_mgr *km; 1635 1636 rcu_read_lock(); 1637 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1638 if (km->notify_policy) 1639 km->notify_policy(xp, dir, c); 1640 rcu_read_unlock(); 1641} 1642 1643void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1644{ 1645 struct xfrm_mgr *km; 1646 rcu_read_lock(); 1647 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1648 if (km->notify) 1649 km->notify(x, c); 1650 rcu_read_unlock(); 1651} 1652 1653EXPORT_SYMBOL(km_policy_notify); 1654EXPORT_SYMBOL(km_state_notify); 1655 1656void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1657{ 1658 struct net *net = xs_net(x); 1659 struct km_event c; 1660 1661 c.data.hard = hard; 1662 c.portid = portid; 1663 c.event = XFRM_MSG_EXPIRE; 1664 km_state_notify(x, &c); 1665 1666 if (hard) 1667 wake_up(&net->xfrm.km_waitq); 1668} 1669 1670EXPORT_SYMBOL(km_state_expired); 1671/* 1672 * We send to all registered managers regardless of failure 1673 * We are happy with one success 1674*/ 1675int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1676{ 1677 int err = -EINVAL, acqret; 1678 struct xfrm_mgr *km; 1679 1680 rcu_read_lock(); 1681 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1682 acqret = km->acquire(x, t, pol); 1683 if (!acqret) 1684 err = acqret; 1685 } 1686 rcu_read_unlock(); 1687 return err; 1688} 1689EXPORT_SYMBOL(km_query); 1690 1691int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1692{ 1693 int err = -EINVAL; 1694 struct xfrm_mgr *km; 1695 1696 rcu_read_lock(); 1697 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1698 if (km->new_mapping) 1699 err = km->new_mapping(x, ipaddr, sport); 1700 if (!err) 1701 break; 1702 } 1703 rcu_read_unlock(); 1704 return err; 1705} 1706EXPORT_SYMBOL(km_new_mapping); 1707 1708void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1709{ 1710 struct net *net = xp_net(pol); 1711 struct km_event c; 1712 1713 c.data.hard = hard; 1714 c.portid = portid; 1715 c.event = XFRM_MSG_POLEXPIRE; 1716 km_policy_notify(pol, dir, &c); 1717 1718 if (hard) 1719 wake_up(&net->xfrm.km_waitq); 1720} 1721EXPORT_SYMBOL(km_policy_expired); 1722 1723#ifdef CONFIG_XFRM_MIGRATE 1724int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1725 const struct xfrm_migrate *m, int num_migrate, 1726 const struct xfrm_kmaddress *k) 1727{ 1728 int err = -EINVAL; 1729 int ret; 1730 struct xfrm_mgr *km; 1731 1732 rcu_read_lock(); 1733 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1734 if (km->migrate) { 1735 ret = km->migrate(sel, dir, type, m, num_migrate, k); 1736 if (!ret) 1737 err = ret; 1738 } 1739 } 1740 rcu_read_unlock(); 1741 return err; 1742} 1743EXPORT_SYMBOL(km_migrate); 1744#endif 1745 1746int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 1747{ 1748 int err = -EINVAL; 1749 int ret; 1750 struct xfrm_mgr *km; 1751 1752 rcu_read_lock(); 1753 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1754 if (km->report) { 1755 ret = km->report(net, proto, sel, addr); 1756 if (!ret) 1757 err = ret; 1758 } 1759 } 1760 rcu_read_unlock(); 1761 return err; 1762} 1763EXPORT_SYMBOL(km_report); 1764 1765int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1766{ 1767 int err; 1768 u8 *data; 1769 struct xfrm_mgr *km; 1770 struct xfrm_policy *pol = NULL; 1771 1772 if (optlen <= 0 || optlen > PAGE_SIZE) 1773 return -EMSGSIZE; 1774 1775 data = kmalloc(optlen, GFP_KERNEL); 1776 if (!data) 1777 return -ENOMEM; 1778 1779 err = -EFAULT; 1780 if (copy_from_user(data, optval, optlen)) 1781 goto out; 1782 1783 err = -EINVAL; 1784 rcu_read_lock(); 1785 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1786 pol = km->compile_policy(sk, optname, data, 1787 optlen, &err); 1788 if (err >= 0) 1789 break; 1790 } 1791 rcu_read_unlock(); 1792 1793 if (err >= 0) { 1794 xfrm_sk_policy_insert(sk, err, pol); 1795 xfrm_pol_put(pol); 1796 err = 0; 1797 } 1798 1799out: 1800 kfree(data); 1801 return err; 1802} 1803EXPORT_SYMBOL(xfrm_user_policy); 1804 1805static DEFINE_SPINLOCK(xfrm_km_lock); 1806 1807int xfrm_register_km(struct xfrm_mgr *km) 1808{ 1809 spin_lock_bh(&xfrm_km_lock); 1810 list_add_tail_rcu(&km->list, &xfrm_km_list); 1811 spin_unlock_bh(&xfrm_km_lock); 1812 return 0; 1813} 1814EXPORT_SYMBOL(xfrm_register_km); 1815 1816int xfrm_unregister_km(struct xfrm_mgr *km) 1817{ 1818 spin_lock_bh(&xfrm_km_lock); 1819 list_del_rcu(&km->list); 1820 spin_unlock_bh(&xfrm_km_lock); 1821 synchronize_rcu(); 1822 return 0; 1823} 1824EXPORT_SYMBOL(xfrm_unregister_km); 1825 1826int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 1827{ 1828 int err = 0; 1829 if (unlikely(afinfo == NULL)) 1830 return -EINVAL; 1831 if (unlikely(afinfo->family >= NPROTO)) 1832 return -EAFNOSUPPORT; 1833 spin_lock_bh(&xfrm_state_afinfo_lock); 1834 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 1835 err = -ENOBUFS; 1836 else 1837 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 1838 spin_unlock_bh(&xfrm_state_afinfo_lock); 1839 return err; 1840} 1841EXPORT_SYMBOL(xfrm_state_register_afinfo); 1842 1843int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 1844{ 1845 int err = 0; 1846 if (unlikely(afinfo == NULL)) 1847 return -EINVAL; 1848 if (unlikely(afinfo->family >= NPROTO)) 1849 return -EAFNOSUPPORT; 1850 spin_lock_bh(&xfrm_state_afinfo_lock); 1851 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 1852 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) 1853 err = -EINVAL; 1854 else 1855 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 1856 } 1857 spin_unlock_bh(&xfrm_state_afinfo_lock); 1858 synchronize_rcu(); 1859 return err; 1860} 1861EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 1862 1863static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 1864{ 1865 struct xfrm_state_afinfo *afinfo; 1866 if (unlikely(family >= NPROTO)) 1867 return NULL; 1868 rcu_read_lock(); 1869 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 1870 if (unlikely(!afinfo)) 1871 rcu_read_unlock(); 1872 return afinfo; 1873} 1874 1875static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) 1876{ 1877 rcu_read_unlock(); 1878} 1879 1880/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 1881void xfrm_state_delete_tunnel(struct xfrm_state *x) 1882{ 1883 if (x->tunnel) { 1884 struct xfrm_state *t = x->tunnel; 1885 1886 if (atomic_read(&t->tunnel_users) == 2) 1887 xfrm_state_delete(t); 1888 atomic_dec(&t->tunnel_users); 1889 xfrm_state_put(t); 1890 x->tunnel = NULL; 1891 } 1892} 1893EXPORT_SYMBOL(xfrm_state_delete_tunnel); 1894 1895int xfrm_state_mtu(struct xfrm_state *x, int mtu) 1896{ 1897 int res; 1898 1899 spin_lock_bh(&x->lock); 1900 if (x->km.state == XFRM_STATE_VALID && 1901 x->type && x->type->get_mtu) 1902 res = x->type->get_mtu(x, mtu); 1903 else 1904 res = mtu - x->props.header_len; 1905 spin_unlock_bh(&x->lock); 1906 return res; 1907} 1908 1909int __xfrm_init_state(struct xfrm_state *x, bool init_replay) 1910{ 1911 struct xfrm_state_afinfo *afinfo; 1912 struct xfrm_mode *inner_mode; 1913 int family = x->props.family; 1914 int err; 1915 1916 err = -EAFNOSUPPORT; 1917 afinfo = xfrm_state_get_afinfo(family); 1918 if (!afinfo) 1919 goto error; 1920 1921 err = 0; 1922 if (afinfo->init_flags) 1923 err = afinfo->init_flags(x); 1924 1925 xfrm_state_put_afinfo(afinfo); 1926 1927 if (err) 1928 goto error; 1929 1930 err = -EPROTONOSUPPORT; 1931 1932 if (x->sel.family != AF_UNSPEC) { 1933 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 1934 if (inner_mode == NULL) 1935 goto error; 1936 1937 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 1938 family != x->sel.family) { 1939 xfrm_put_mode(inner_mode); 1940 goto error; 1941 } 1942 1943 x->inner_mode = inner_mode; 1944 } else { 1945 struct xfrm_mode *inner_mode_iaf; 1946 int iafamily = AF_INET; 1947 1948 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 1949 if (inner_mode == NULL) 1950 goto error; 1951 1952 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 1953 xfrm_put_mode(inner_mode); 1954 goto error; 1955 } 1956 x->inner_mode = inner_mode; 1957 1958 if (x->props.family == AF_INET) 1959 iafamily = AF_INET6; 1960 1961 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 1962 if (inner_mode_iaf) { 1963 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 1964 x->inner_mode_iaf = inner_mode_iaf; 1965 else 1966 xfrm_put_mode(inner_mode_iaf); 1967 } 1968 } 1969 1970 x->type = xfrm_get_type(x->id.proto, family); 1971 if (x->type == NULL) 1972 goto error; 1973 1974 err = x->type->init_state(x); 1975 if (err) 1976 goto error; 1977 1978 x->outer_mode = xfrm_get_mode(x->props.mode, family); 1979 if (x->outer_mode == NULL) { 1980 err = -EPROTONOSUPPORT; 1981 goto error; 1982 } 1983 1984 if (init_replay) { 1985 err = xfrm_init_replay(x); 1986 if (err) 1987 goto error; 1988 } 1989 1990 x->km.state = XFRM_STATE_VALID; 1991 1992error: 1993 return err; 1994} 1995 1996EXPORT_SYMBOL(__xfrm_init_state); 1997 1998int xfrm_init_state(struct xfrm_state *x) 1999{ 2000 return __xfrm_init_state(x, true); 2001} 2002 2003EXPORT_SYMBOL(xfrm_init_state); 2004 2005int __net_init xfrm_state_init(struct net *net) 2006{ 2007 unsigned int sz; 2008 2009 INIT_LIST_HEAD(&net->xfrm.state_all); 2010 2011 sz = sizeof(struct hlist_head) * 8; 2012 2013 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2014 if (!net->xfrm.state_bydst) 2015 goto out_bydst; 2016 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2017 if (!net->xfrm.state_bysrc) 2018 goto out_bysrc; 2019 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2020 if (!net->xfrm.state_byspi) 2021 goto out_byspi; 2022 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2023 2024 net->xfrm.state_num = 0; 2025 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2026 INIT_HLIST_HEAD(&net->xfrm.state_gc_list); 2027 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); 2028 init_waitqueue_head(&net->xfrm.km_waitq); 2029 return 0; 2030 2031out_byspi: 2032 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2033out_bysrc: 2034 xfrm_hash_free(net->xfrm.state_bydst, sz); 2035out_bydst: 2036 return -ENOMEM; 2037} 2038 2039void xfrm_state_fini(struct net *net) 2040{ 2041 struct xfrm_audit audit_info; 2042 unsigned int sz; 2043 2044 flush_work(&net->xfrm.state_hash_work); 2045 audit_info.loginuid = INVALID_UID; 2046 audit_info.sessionid = -1; 2047 audit_info.secid = 0; 2048 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); 2049 flush_work(&net->xfrm.state_gc_work); 2050 2051 WARN_ON(!list_empty(&net->xfrm.state_all)); 2052 2053 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2054 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2055 xfrm_hash_free(net->xfrm.state_byspi, sz); 2056 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2057 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2058 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2059 xfrm_hash_free(net->xfrm.state_bydst, sz); 2060} 2061 2062#ifdef CONFIG_AUDITSYSCALL 2063static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2064 struct audit_buffer *audit_buf) 2065{ 2066 struct xfrm_sec_ctx *ctx = x->security; 2067 u32 spi = ntohl(x->id.spi); 2068 2069 if (ctx) 2070 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2071 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2072 2073 switch(x->props.family) { 2074 case AF_INET: 2075 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2076 &x->props.saddr.a4, &x->id.daddr.a4); 2077 break; 2078 case AF_INET6: 2079 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2080 x->props.saddr.a6, x->id.daddr.a6); 2081 break; 2082 } 2083 2084 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2085} 2086 2087static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2088 struct audit_buffer *audit_buf) 2089{ 2090 const struct iphdr *iph4; 2091 const struct ipv6hdr *iph6; 2092 2093 switch (family) { 2094 case AF_INET: 2095 iph4 = ip_hdr(skb); 2096 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2097 &iph4->saddr, &iph4->daddr); 2098 break; 2099 case AF_INET6: 2100 iph6 = ipv6_hdr(skb); 2101 audit_log_format(audit_buf, 2102 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2103 &iph6->saddr,&iph6->daddr, 2104 iph6->flow_lbl[0] & 0x0f, 2105 iph6->flow_lbl[1], 2106 iph6->flow_lbl[2]); 2107 break; 2108 } 2109} 2110 2111void xfrm_audit_state_add(struct xfrm_state *x, int result, 2112 kuid_t auid, u32 sessionid, u32 secid) 2113{ 2114 struct audit_buffer *audit_buf; 2115 2116 audit_buf = xfrm_audit_start("SAD-add"); 2117 if (audit_buf == NULL) 2118 return; 2119 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2120 xfrm_audit_helper_sainfo(x, audit_buf); 2121 audit_log_format(audit_buf, " res=%u", result); 2122 audit_log_end(audit_buf); 2123} 2124EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2125 2126void xfrm_audit_state_delete(struct xfrm_state *x, int result, 2127 kuid_t auid, u32 sessionid, u32 secid) 2128{ 2129 struct audit_buffer *audit_buf; 2130 2131 audit_buf = xfrm_audit_start("SAD-delete"); 2132 if (audit_buf == NULL) 2133 return; 2134 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2135 xfrm_audit_helper_sainfo(x, audit_buf); 2136 audit_log_format(audit_buf, " res=%u", result); 2137 audit_log_end(audit_buf); 2138} 2139EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2140 2141void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2142 struct sk_buff *skb) 2143{ 2144 struct audit_buffer *audit_buf; 2145 u32 spi; 2146 2147 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2148 if (audit_buf == NULL) 2149 return; 2150 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2151 /* don't record the sequence number because it's inherent in this kind 2152 * of audit message */ 2153 spi = ntohl(x->id.spi); 2154 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2155 audit_log_end(audit_buf); 2156} 2157EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2158 2159void xfrm_audit_state_replay(struct xfrm_state *x, 2160 struct sk_buff *skb, __be32 net_seq) 2161{ 2162 struct audit_buffer *audit_buf; 2163 u32 spi; 2164 2165 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2166 if (audit_buf == NULL) 2167 return; 2168 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2169 spi = ntohl(x->id.spi); 2170 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2171 spi, spi, ntohl(net_seq)); 2172 audit_log_end(audit_buf); 2173} 2174EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2175 2176void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2177{ 2178 struct audit_buffer *audit_buf; 2179 2180 audit_buf = xfrm_audit_start("SA-notfound"); 2181 if (audit_buf == NULL) 2182 return; 2183 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2184 audit_log_end(audit_buf); 2185} 2186EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2187 2188void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2189 __be32 net_spi, __be32 net_seq) 2190{ 2191 struct audit_buffer *audit_buf; 2192 u32 spi; 2193 2194 audit_buf = xfrm_audit_start("SA-notfound"); 2195 if (audit_buf == NULL) 2196 return; 2197 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2198 spi = ntohl(net_spi); 2199 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2200 spi, spi, ntohl(net_seq)); 2201 audit_log_end(audit_buf); 2202} 2203EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2204 2205void xfrm_audit_state_icvfail(struct xfrm_state *x, 2206 struct sk_buff *skb, u8 proto) 2207{ 2208 struct audit_buffer *audit_buf; 2209 __be32 net_spi; 2210 __be32 net_seq; 2211 2212 audit_buf = xfrm_audit_start("SA-icv-failure"); 2213 if (audit_buf == NULL) 2214 return; 2215 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2216 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2217 u32 spi = ntohl(net_spi); 2218 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2219 spi, spi, ntohl(net_seq)); 2220 } 2221 audit_log_end(audit_buf); 2222} 2223EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2224#endif /* CONFIG_AUDITSYSCALL */ 2225