1 /* 2 * xfrm_state.c 3 * 4 * Changes: 5 * Mitsuru KANDA @USAGI 6 * Kazunori MIYAZAWA @USAGI 7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 8 * IPv6 support 9 * YOSHIFUJI Hideaki @USAGI 10 * Split up af-specific functions 11 * Derek Atkins <derek@ihtfp.com> 12 * Add UDP Encapsulation 13 * 14 */ 15 16 #include <linux/workqueue.h> 17 #include <net/xfrm.h> 18 #include <linux/pfkeyv2.h> 19 #include <linux/ipsec.h> 20 #include <linux/module.h> 21 #include <linux/cache.h> 22 #include <linux/audit.h> 23 #include <asm/uaccess.h> 24 #include <linux/ktime.h> 25 #include <linux/slab.h> 26 #include <linux/interrupt.h> 27 #include <linux/kernel.h> 28 29 #include "xfrm_hash.h" 30 31 /* Each xfrm_state may be linked to two tables: 32 33 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) 34 2. Hash table by (daddr,family,reqid) to find what SAs exist for given 35 destination/tunnel endpoint. (output) 36 */ 37 38 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; 39 40 static inline unsigned int xfrm_dst_hash(struct net *net, 41 const xfrm_address_t *daddr, 42 const xfrm_address_t *saddr, 43 u32 reqid, 44 unsigned short family) 45 { 46 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); 47 } 48 49 static inline unsigned int xfrm_src_hash(struct net *net, 50 const xfrm_address_t *daddr, 51 const xfrm_address_t *saddr, 52 unsigned short family) 53 { 54 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); 55 } 56 57 static inline unsigned int 58 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, 59 __be32 spi, u8 proto, unsigned short family) 60 { 61 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); 62 } 63 64 static void xfrm_hash_transfer(struct hlist_head *list, 65 struct hlist_head *ndsttable, 66 struct hlist_head *nsrctable, 67 struct hlist_head *nspitable, 68 unsigned int nhashmask) 69 { 70 struct hlist_node *tmp; 71 struct xfrm_state *x; 72 73 hlist_for_each_entry_safe(x, tmp, list, bydst) { 74 unsigned int h; 75 76 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, 77 x->props.reqid, x->props.family, 78 nhashmask); 79 hlist_add_head(&x->bydst, ndsttable+h); 80 81 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, 82 x->props.family, 83 nhashmask); 84 hlist_add_head(&x->bysrc, nsrctable+h); 85 86 if (x->id.spi) { 87 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, 88 x->id.proto, x->props.family, 89 nhashmask); 90 hlist_add_head(&x->byspi, nspitable+h); 91 } 92 } 93 } 94 95 static unsigned long xfrm_hash_new_size(unsigned int state_hmask) 96 { 97 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); 98 } 99 100 static DEFINE_MUTEX(hash_resize_mutex); 101 102 static void xfrm_hash_resize(struct work_struct *work) 103 { 104 struct net *net = container_of(work, struct net, xfrm.state_hash_work); 105 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; 106 unsigned long nsize, osize; 107 unsigned int nhashmask, ohashmask; 108 int i; 109 110 mutex_lock(&hash_resize_mutex); 111 112 nsize = xfrm_hash_new_size(net->xfrm.state_hmask); 113 ndst = xfrm_hash_alloc(nsize); 114 if (!ndst) 115 goto out_unlock; 116 nsrc = xfrm_hash_alloc(nsize); 117 if (!nsrc) { 118 xfrm_hash_free(ndst, nsize); 119 goto out_unlock; 120 } 121 nspi = xfrm_hash_alloc(nsize); 122 if (!nspi) { 123 xfrm_hash_free(ndst, nsize); 124 xfrm_hash_free(nsrc, nsize); 125 goto out_unlock; 126 } 127 128 spin_lock_bh(&net->xfrm.xfrm_state_lock); 129 130 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; 131 for (i = net->xfrm.state_hmask; i >= 0; i--) 132 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, 133 nhashmask); 134 135 odst = net->xfrm.state_bydst; 136 osrc = net->xfrm.state_bysrc; 137 ospi = net->xfrm.state_byspi; 138 ohashmask = net->xfrm.state_hmask; 139 140 net->xfrm.state_bydst = ndst; 141 net->xfrm.state_bysrc = nsrc; 142 net->xfrm.state_byspi = nspi; 143 net->xfrm.state_hmask = nhashmask; 144 145 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 146 147 osize = (ohashmask + 1) * sizeof(struct hlist_head); 148 xfrm_hash_free(odst, osize); 149 xfrm_hash_free(osrc, osize); 150 xfrm_hash_free(ospi, osize); 151 152 out_unlock: 153 mutex_unlock(&hash_resize_mutex); 154 } 155 156 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); 157 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; 158 159 static DEFINE_SPINLOCK(xfrm_state_gc_lock); 160 161 int __xfrm_state_delete(struct xfrm_state *x); 162 163 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 164 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 165 166 static DEFINE_SPINLOCK(xfrm_type_lock); 167 int xfrm_register_type(const struct xfrm_type *type, unsigned short family) 168 { 169 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 170 const struct xfrm_type **typemap; 171 int err = 0; 172 173 if (unlikely(afinfo == NULL)) 174 return -EAFNOSUPPORT; 175 typemap = afinfo->type_map; 176 spin_lock_bh(&xfrm_type_lock); 177 178 if (likely(typemap[type->proto] == NULL)) 179 typemap[type->proto] = type; 180 else 181 err = -EEXIST; 182 spin_unlock_bh(&xfrm_type_lock); 183 xfrm_state_put_afinfo(afinfo); 184 return err; 185 } 186 EXPORT_SYMBOL(xfrm_register_type); 187 188 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) 189 { 190 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 191 const struct xfrm_type **typemap; 192 int err = 0; 193 194 if (unlikely(afinfo == NULL)) 195 return -EAFNOSUPPORT; 196 typemap = afinfo->type_map; 197 spin_lock_bh(&xfrm_type_lock); 198 199 if (unlikely(typemap[type->proto] != type)) 200 err = -ENOENT; 201 else 202 typemap[type->proto] = NULL; 203 spin_unlock_bh(&xfrm_type_lock); 204 xfrm_state_put_afinfo(afinfo); 205 return err; 206 } 207 EXPORT_SYMBOL(xfrm_unregister_type); 208 209 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 210 { 211 struct xfrm_state_afinfo *afinfo; 212 const struct xfrm_type **typemap; 213 const struct xfrm_type *type; 214 int modload_attempted = 0; 215 216 retry: 217 afinfo = xfrm_state_get_afinfo(family); 218 if (unlikely(afinfo == NULL)) 219 return NULL; 220 typemap = afinfo->type_map; 221 222 type = typemap[proto]; 223 if (unlikely(type && !try_module_get(type->owner))) 224 type = NULL; 225 if (!type && !modload_attempted) { 226 xfrm_state_put_afinfo(afinfo); 227 request_module("xfrm-type-%d-%d", family, proto); 228 modload_attempted = 1; 229 goto retry; 230 } 231 232 xfrm_state_put_afinfo(afinfo); 233 return type; 234 } 235 236 static void xfrm_put_type(const struct xfrm_type *type) 237 { 238 module_put(type->owner); 239 } 240 241 static DEFINE_SPINLOCK(xfrm_mode_lock); 242 int xfrm_register_mode(struct xfrm_mode *mode, int family) 243 { 244 struct xfrm_state_afinfo *afinfo; 245 struct xfrm_mode **modemap; 246 int err; 247 248 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 249 return -EINVAL; 250 251 afinfo = xfrm_state_get_afinfo(family); 252 if (unlikely(afinfo == NULL)) 253 return -EAFNOSUPPORT; 254 255 err = -EEXIST; 256 modemap = afinfo->mode_map; 257 spin_lock_bh(&xfrm_mode_lock); 258 if (modemap[mode->encap]) 259 goto out; 260 261 err = -ENOENT; 262 if (!try_module_get(afinfo->owner)) 263 goto out; 264 265 mode->afinfo = afinfo; 266 modemap[mode->encap] = mode; 267 err = 0; 268 269 out: 270 spin_unlock_bh(&xfrm_mode_lock); 271 xfrm_state_put_afinfo(afinfo); 272 return err; 273 } 274 EXPORT_SYMBOL(xfrm_register_mode); 275 276 int xfrm_unregister_mode(struct xfrm_mode *mode, int family) 277 { 278 struct xfrm_state_afinfo *afinfo; 279 struct xfrm_mode **modemap; 280 int err; 281 282 if (unlikely(mode->encap >= XFRM_MODE_MAX)) 283 return -EINVAL; 284 285 afinfo = xfrm_state_get_afinfo(family); 286 if (unlikely(afinfo == NULL)) 287 return -EAFNOSUPPORT; 288 289 err = -ENOENT; 290 modemap = afinfo->mode_map; 291 spin_lock_bh(&xfrm_mode_lock); 292 if (likely(modemap[mode->encap] == mode)) { 293 modemap[mode->encap] = NULL; 294 module_put(mode->afinfo->owner); 295 err = 0; 296 } 297 298 spin_unlock_bh(&xfrm_mode_lock); 299 xfrm_state_put_afinfo(afinfo); 300 return err; 301 } 302 EXPORT_SYMBOL(xfrm_unregister_mode); 303 304 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 305 { 306 struct xfrm_state_afinfo *afinfo; 307 struct xfrm_mode *mode; 308 int modload_attempted = 0; 309 310 if (unlikely(encap >= XFRM_MODE_MAX)) 311 return NULL; 312 313 retry: 314 afinfo = xfrm_state_get_afinfo(family); 315 if (unlikely(afinfo == NULL)) 316 return NULL; 317 318 mode = afinfo->mode_map[encap]; 319 if (unlikely(mode && !try_module_get(mode->owner))) 320 mode = NULL; 321 if (!mode && !modload_attempted) { 322 xfrm_state_put_afinfo(afinfo); 323 request_module("xfrm-mode-%d-%d", family, encap); 324 modload_attempted = 1; 325 goto retry; 326 } 327 328 xfrm_state_put_afinfo(afinfo); 329 return mode; 330 } 331 332 static void xfrm_put_mode(struct xfrm_mode *mode) 333 { 334 module_put(mode->owner); 335 } 336 337 static void xfrm_state_gc_destroy(struct xfrm_state *x) 338 { 339 tasklet_hrtimer_cancel(&x->mtimer); 340 del_timer_sync(&x->rtimer); 341 kfree(x->aalg); 342 kfree(x->ealg); 343 kfree(x->calg); 344 kfree(x->encap); 345 kfree(x->coaddr); 346 kfree(x->replay_esn); 347 kfree(x->preplay_esn); 348 if (x->inner_mode) 349 xfrm_put_mode(x->inner_mode); 350 if (x->inner_mode_iaf) 351 xfrm_put_mode(x->inner_mode_iaf); 352 if (x->outer_mode) 353 xfrm_put_mode(x->outer_mode); 354 if (x->type) { 355 x->type->destructor(x); 356 xfrm_put_type(x->type); 357 } 358 security_xfrm_state_free(x); 359 kfree(x); 360 } 361 362 static void xfrm_state_gc_task(struct work_struct *work) 363 { 364 struct net *net = container_of(work, struct net, xfrm.state_gc_work); 365 struct xfrm_state *x; 366 struct hlist_node *tmp; 367 struct hlist_head gc_list; 368 369 spin_lock_bh(&xfrm_state_gc_lock); 370 hlist_move_list(&net->xfrm.state_gc_list, &gc_list); 371 spin_unlock_bh(&xfrm_state_gc_lock); 372 373 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) 374 xfrm_state_gc_destroy(x); 375 } 376 377 static inline unsigned long make_jiffies(long secs) 378 { 379 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) 380 return MAX_SCHEDULE_TIMEOUT-1; 381 else 382 return secs*HZ; 383 } 384 385 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) 386 { 387 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); 388 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); 389 unsigned long now = get_seconds(); 390 long next = LONG_MAX; 391 int warn = 0; 392 int err = 0; 393 394 spin_lock(&x->lock); 395 if (x->km.state == XFRM_STATE_DEAD) 396 goto out; 397 if (x->km.state == XFRM_STATE_EXPIRED) 398 goto expired; 399 if (x->lft.hard_add_expires_seconds) { 400 long tmo = x->lft.hard_add_expires_seconds + 401 x->curlft.add_time - now; 402 if (tmo <= 0) { 403 if (x->xflags & XFRM_SOFT_EXPIRE) { 404 /* enter hard expire without soft expire first?! 405 * setting a new date could trigger this. 406 * workarbound: fix x->curflt.add_time by below: 407 */ 408 x->curlft.add_time = now - x->saved_tmo - 1; 409 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; 410 } else 411 goto expired; 412 } 413 if (tmo < next) 414 next = tmo; 415 } 416 if (x->lft.hard_use_expires_seconds) { 417 long tmo = x->lft.hard_use_expires_seconds + 418 (x->curlft.use_time ? : now) - now; 419 if (tmo <= 0) 420 goto expired; 421 if (tmo < next) 422 next = tmo; 423 } 424 if (x->km.dying) 425 goto resched; 426 if (x->lft.soft_add_expires_seconds) { 427 long tmo = x->lft.soft_add_expires_seconds + 428 x->curlft.add_time - now; 429 if (tmo <= 0) { 430 warn = 1; 431 x->xflags &= ~XFRM_SOFT_EXPIRE; 432 } else if (tmo < next) { 433 next = tmo; 434 x->xflags |= XFRM_SOFT_EXPIRE; 435 x->saved_tmo = tmo; 436 } 437 } 438 if (x->lft.soft_use_expires_seconds) { 439 long tmo = x->lft.soft_use_expires_seconds + 440 (x->curlft.use_time ? : now) - now; 441 if (tmo <= 0) 442 warn = 1; 443 else if (tmo < next) 444 next = tmo; 445 } 446 447 x->km.dying = warn; 448 if (warn) 449 km_state_expired(x, 0, 0); 450 resched: 451 if (next != LONG_MAX) { 452 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); 453 } 454 455 goto out; 456 457 expired: 458 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) 459 x->km.state = XFRM_STATE_EXPIRED; 460 461 err = __xfrm_state_delete(x); 462 if (!err) 463 km_state_expired(x, 1, 0); 464 465 xfrm_audit_state_delete(x, err ? 0 : 1, 466 audit_get_loginuid(current), 467 audit_get_sessionid(current), 0); 468 469 out: 470 spin_unlock(&x->lock); 471 return HRTIMER_NORESTART; 472 } 473 474 static void xfrm_replay_timer_handler(unsigned long data); 475 476 struct xfrm_state *xfrm_state_alloc(struct net *net) 477 { 478 struct xfrm_state *x; 479 480 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); 481 482 if (x) { 483 write_pnet(&x->xs_net, net); 484 atomic_set(&x->refcnt, 1); 485 atomic_set(&x->tunnel_users, 0); 486 INIT_LIST_HEAD(&x->km.all); 487 INIT_HLIST_NODE(&x->bydst); 488 INIT_HLIST_NODE(&x->bysrc); 489 INIT_HLIST_NODE(&x->byspi); 490 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, 491 CLOCK_BOOTTIME, HRTIMER_MODE_ABS); 492 setup_timer(&x->rtimer, xfrm_replay_timer_handler, 493 (unsigned long)x); 494 x->curlft.add_time = get_seconds(); 495 x->lft.soft_byte_limit = XFRM_INF; 496 x->lft.soft_packet_limit = XFRM_INF; 497 x->lft.hard_byte_limit = XFRM_INF; 498 x->lft.hard_packet_limit = XFRM_INF; 499 x->replay_maxage = 0; 500 x->replay_maxdiff = 0; 501 x->inner_mode = NULL; 502 x->inner_mode_iaf = NULL; 503 spin_lock_init(&x->lock); 504 } 505 return x; 506 } 507 EXPORT_SYMBOL(xfrm_state_alloc); 508 509 void __xfrm_state_destroy(struct xfrm_state *x) 510 { 511 struct net *net = xs_net(x); 512 513 WARN_ON(x->km.state != XFRM_STATE_DEAD); 514 515 spin_lock_bh(&xfrm_state_gc_lock); 516 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); 517 spin_unlock_bh(&xfrm_state_gc_lock); 518 schedule_work(&net->xfrm.state_gc_work); 519 } 520 EXPORT_SYMBOL(__xfrm_state_destroy); 521 522 int __xfrm_state_delete(struct xfrm_state *x) 523 { 524 struct net *net = xs_net(x); 525 int err = -ESRCH; 526 527 if (x->km.state != XFRM_STATE_DEAD) { 528 x->km.state = XFRM_STATE_DEAD; 529 spin_lock(&net->xfrm.xfrm_state_lock); 530 list_del(&x->km.all); 531 hlist_del(&x->bydst); 532 hlist_del(&x->bysrc); 533 if (x->id.spi) 534 hlist_del(&x->byspi); 535 net->xfrm.state_num--; 536 spin_unlock(&net->xfrm.xfrm_state_lock); 537 538 /* All xfrm_state objects are created by xfrm_state_alloc. 539 * The xfrm_state_alloc call gives a reference, and that 540 * is what we are dropping here. 541 */ 542 xfrm_state_put(x); 543 err = 0; 544 } 545 546 return err; 547 } 548 EXPORT_SYMBOL(__xfrm_state_delete); 549 550 int xfrm_state_delete(struct xfrm_state *x) 551 { 552 int err; 553 554 spin_lock_bh(&x->lock); 555 err = __xfrm_state_delete(x); 556 spin_unlock_bh(&x->lock); 557 558 return err; 559 } 560 EXPORT_SYMBOL(xfrm_state_delete); 561 562 #ifdef CONFIG_SECURITY_NETWORK_XFRM 563 static inline int 564 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 565 { 566 int i, err = 0; 567 568 for (i = 0; i <= net->xfrm.state_hmask; i++) { 569 struct xfrm_state *x; 570 571 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 572 if (xfrm_id_proto_match(x->id.proto, proto) && 573 (err = security_xfrm_state_delete(x)) != 0) { 574 xfrm_audit_state_delete(x, 0, 575 audit_info->loginuid, 576 audit_info->sessionid, 577 audit_info->secid); 578 return err; 579 } 580 } 581 } 582 583 return err; 584 } 585 #else 586 static inline int 587 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) 588 { 589 return 0; 590 } 591 #endif 592 593 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) 594 { 595 int i, err = 0, cnt = 0; 596 597 spin_lock_bh(&net->xfrm.xfrm_state_lock); 598 err = xfrm_state_flush_secctx_check(net, proto, audit_info); 599 if (err) 600 goto out; 601 602 err = -ESRCH; 603 for (i = 0; i <= net->xfrm.state_hmask; i++) { 604 struct xfrm_state *x; 605 restart: 606 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 607 if (!xfrm_state_kern(x) && 608 xfrm_id_proto_match(x->id.proto, proto)) { 609 xfrm_state_hold(x); 610 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 611 612 err = xfrm_state_delete(x); 613 xfrm_audit_state_delete(x, err ? 0 : 1, 614 audit_info->loginuid, 615 audit_info->sessionid, 616 audit_info->secid); 617 xfrm_state_put(x); 618 if (!err) 619 cnt++; 620 621 spin_lock_bh(&net->xfrm.xfrm_state_lock); 622 goto restart; 623 } 624 } 625 } 626 if (cnt) 627 err = 0; 628 629 out: 630 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 631 return err; 632 } 633 EXPORT_SYMBOL(xfrm_state_flush); 634 635 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) 636 { 637 spin_lock_bh(&net->xfrm.xfrm_state_lock); 638 si->sadcnt = net->xfrm.state_num; 639 si->sadhcnt = net->xfrm.state_hmask; 640 si->sadhmcnt = xfrm_state_hashmax; 641 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 642 } 643 EXPORT_SYMBOL(xfrm_sad_getinfo); 644 645 static int 646 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, 647 const struct xfrm_tmpl *tmpl, 648 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 649 unsigned short family) 650 { 651 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 652 if (!afinfo) 653 return -1; 654 afinfo->init_tempsel(&x->sel, fl); 655 656 if (family != tmpl->encap_family) { 657 xfrm_state_put_afinfo(afinfo); 658 afinfo = xfrm_state_get_afinfo(tmpl->encap_family); 659 if (!afinfo) 660 return -1; 661 } 662 afinfo->init_temprop(x, tmpl, daddr, saddr); 663 xfrm_state_put_afinfo(afinfo); 664 return 0; 665 } 666 667 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 668 const xfrm_address_t *daddr, 669 __be32 spi, u8 proto, 670 unsigned short family) 671 { 672 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); 673 struct xfrm_state *x; 674 675 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) { 676 if (x->props.family != family || 677 x->id.spi != spi || 678 x->id.proto != proto || 679 !xfrm_addr_equal(&x->id.daddr, daddr, family)) 680 continue; 681 682 if ((mark & x->mark.m) != x->mark.v) 683 continue; 684 xfrm_state_hold(x); 685 return x; 686 } 687 688 return NULL; 689 } 690 691 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, 692 const xfrm_address_t *daddr, 693 const xfrm_address_t *saddr, 694 u8 proto, unsigned short family) 695 { 696 unsigned int h = xfrm_src_hash(net, daddr, saddr, family); 697 struct xfrm_state *x; 698 699 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 700 if (x->props.family != family || 701 x->id.proto != proto || 702 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 703 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 704 continue; 705 706 if ((mark & x->mark.m) != x->mark.v) 707 continue; 708 xfrm_state_hold(x); 709 return x; 710 } 711 712 return NULL; 713 } 714 715 static inline struct xfrm_state * 716 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) 717 { 718 struct net *net = xs_net(x); 719 u32 mark = x->mark.v & x->mark.m; 720 721 if (use_spi) 722 return __xfrm_state_lookup(net, mark, &x->id.daddr, 723 x->id.spi, x->id.proto, family); 724 else 725 return __xfrm_state_lookup_byaddr(net, mark, 726 &x->id.daddr, 727 &x->props.saddr, 728 x->id.proto, family); 729 } 730 731 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) 732 { 733 if (have_hash_collision && 734 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && 735 net->xfrm.state_num > net->xfrm.state_hmask) 736 schedule_work(&net->xfrm.state_hash_work); 737 } 738 739 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, 740 const struct flowi *fl, unsigned short family, 741 struct xfrm_state **best, int *acq_in_progress, 742 int *error) 743 { 744 /* Resolution logic: 745 * 1. There is a valid state with matching selector. Done. 746 * 2. Valid state with inappropriate selector. Skip. 747 * 748 * Entering area of "sysdeps". 749 * 750 * 3. If state is not valid, selector is temporary, it selects 751 * only session which triggered previous resolution. Key 752 * manager will do something to install a state with proper 753 * selector. 754 */ 755 if (x->km.state == XFRM_STATE_VALID) { 756 if ((x->sel.family && 757 !xfrm_selector_match(&x->sel, fl, x->sel.family)) || 758 !security_xfrm_state_pol_flow_match(x, pol, fl)) 759 return; 760 761 if (!*best || 762 (*best)->km.dying > x->km.dying || 763 ((*best)->km.dying == x->km.dying && 764 (*best)->curlft.add_time < x->curlft.add_time)) 765 *best = x; 766 } else if (x->km.state == XFRM_STATE_ACQ) { 767 *acq_in_progress = 1; 768 } else if (x->km.state == XFRM_STATE_ERROR || 769 x->km.state == XFRM_STATE_EXPIRED) { 770 if (xfrm_selector_match(&x->sel, fl, x->sel.family) && 771 security_xfrm_state_pol_flow_match(x, pol, fl)) 772 *error = -ESRCH; 773 } 774 } 775 776 struct xfrm_state * 777 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, 778 const struct flowi *fl, struct xfrm_tmpl *tmpl, 779 struct xfrm_policy *pol, int *err, 780 unsigned short family) 781 { 782 static xfrm_address_t saddr_wildcard = { }; 783 struct net *net = xp_net(pol); 784 unsigned int h, h_wildcard; 785 struct xfrm_state *x, *x0, *to_put; 786 int acquire_in_progress = 0; 787 int error = 0; 788 struct xfrm_state *best = NULL; 789 u32 mark = pol->mark.v & pol->mark.m; 790 unsigned short encap_family = tmpl->encap_family; 791 792 to_put = NULL; 793 794 spin_lock_bh(&net->xfrm.xfrm_state_lock); 795 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); 796 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 797 if (x->props.family == encap_family && 798 x->props.reqid == tmpl->reqid && 799 (mark & x->mark.m) == x->mark.v && 800 !(x->props.flags & XFRM_STATE_WILDRECV) && 801 xfrm_state_addr_check(x, daddr, saddr, encap_family) && 802 tmpl->mode == x->props.mode && 803 tmpl->id.proto == x->id.proto && 804 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 805 xfrm_state_look_at(pol, x, fl, encap_family, 806 &best, &acquire_in_progress, &error); 807 } 808 if (best || acquire_in_progress) 809 goto found; 810 811 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); 812 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) { 813 if (x->props.family == encap_family && 814 x->props.reqid == tmpl->reqid && 815 (mark & x->mark.m) == x->mark.v && 816 !(x->props.flags & XFRM_STATE_WILDRECV) && 817 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && 818 tmpl->mode == x->props.mode && 819 tmpl->id.proto == x->id.proto && 820 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) 821 xfrm_state_look_at(pol, x, fl, encap_family, 822 &best, &acquire_in_progress, &error); 823 } 824 825 found: 826 x = best; 827 if (!x && !error && !acquire_in_progress) { 828 if (tmpl->id.spi && 829 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, 830 tmpl->id.proto, encap_family)) != NULL) { 831 to_put = x0; 832 error = -EEXIST; 833 goto out; 834 } 835 x = xfrm_state_alloc(net); 836 if (x == NULL) { 837 error = -ENOMEM; 838 goto out; 839 } 840 /* Initialize temporary state matching only 841 * to current session. */ 842 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); 843 memcpy(&x->mark, &pol->mark, sizeof(x->mark)); 844 845 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); 846 if (error) { 847 x->km.state = XFRM_STATE_DEAD; 848 to_put = x; 849 x = NULL; 850 goto out; 851 } 852 853 if (km_query(x, tmpl, pol) == 0) { 854 x->km.state = XFRM_STATE_ACQ; 855 list_add(&x->km.all, &net->xfrm.state_all); 856 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 857 h = xfrm_src_hash(net, daddr, saddr, encap_family); 858 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 859 if (x->id.spi) { 860 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); 861 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 862 } 863 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 864 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 865 net->xfrm.state_num++; 866 xfrm_hash_grow_check(net, x->bydst.next != NULL); 867 } else { 868 x->km.state = XFRM_STATE_DEAD; 869 to_put = x; 870 x = NULL; 871 error = -ESRCH; 872 } 873 } 874 out: 875 if (x) 876 xfrm_state_hold(x); 877 else 878 *err = acquire_in_progress ? -EAGAIN : error; 879 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 880 if (to_put) 881 xfrm_state_put(to_put); 882 return x; 883 } 884 885 struct xfrm_state * 886 xfrm_stateonly_find(struct net *net, u32 mark, 887 xfrm_address_t *daddr, xfrm_address_t *saddr, 888 unsigned short family, u8 mode, u8 proto, u32 reqid) 889 { 890 unsigned int h; 891 struct xfrm_state *rx = NULL, *x = NULL; 892 893 spin_lock_bh(&net->xfrm.xfrm_state_lock); 894 h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 895 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 896 if (x->props.family == family && 897 x->props.reqid == reqid && 898 (mark & x->mark.m) == x->mark.v && 899 !(x->props.flags & XFRM_STATE_WILDRECV) && 900 xfrm_state_addr_check(x, daddr, saddr, family) && 901 mode == x->props.mode && 902 proto == x->id.proto && 903 x->km.state == XFRM_STATE_VALID) { 904 rx = x; 905 break; 906 } 907 } 908 909 if (rx) 910 xfrm_state_hold(rx); 911 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 912 913 914 return rx; 915 } 916 EXPORT_SYMBOL(xfrm_stateonly_find); 917 918 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 919 unsigned short family) 920 { 921 struct xfrm_state *x; 922 struct xfrm_state_walk *w; 923 924 spin_lock_bh(&net->xfrm.xfrm_state_lock); 925 list_for_each_entry(w, &net->xfrm.state_all, all) { 926 x = container_of(w, struct xfrm_state, km); 927 if (x->props.family != family || 928 x->id.spi != spi) 929 continue; 930 931 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 932 xfrm_state_hold(x); 933 return x; 934 } 935 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 936 return NULL; 937 } 938 EXPORT_SYMBOL(xfrm_state_lookup_byspi); 939 940 static void __xfrm_state_insert(struct xfrm_state *x) 941 { 942 struct net *net = xs_net(x); 943 unsigned int h; 944 945 list_add(&x->km.all, &net->xfrm.state_all); 946 947 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, 948 x->props.reqid, x->props.family); 949 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 950 951 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); 952 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 953 954 if (x->id.spi) { 955 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, 956 x->props.family); 957 958 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 959 } 960 961 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 962 if (x->replay_maxage) 963 mod_timer(&x->rtimer, jiffies + x->replay_maxage); 964 965 net->xfrm.state_num++; 966 967 xfrm_hash_grow_check(net, x->bydst.next != NULL); 968 } 969 970 /* net->xfrm.xfrm_state_lock is held */ 971 static void __xfrm_state_bump_genids(struct xfrm_state *xnew) 972 { 973 struct net *net = xs_net(xnew); 974 unsigned short family = xnew->props.family; 975 u32 reqid = xnew->props.reqid; 976 struct xfrm_state *x; 977 unsigned int h; 978 u32 mark = xnew->mark.v & xnew->mark.m; 979 980 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); 981 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 982 if (x->props.family == family && 983 x->props.reqid == reqid && 984 (mark & x->mark.m) == x->mark.v && 985 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && 986 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) 987 x->genid++; 988 } 989 } 990 991 void xfrm_state_insert(struct xfrm_state *x) 992 { 993 struct net *net = xs_net(x); 994 995 spin_lock_bh(&net->xfrm.xfrm_state_lock); 996 __xfrm_state_bump_genids(x); 997 __xfrm_state_insert(x); 998 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 999 } 1000 EXPORT_SYMBOL(xfrm_state_insert); 1001 1002 /* net->xfrm.xfrm_state_lock is held */ 1003 static struct xfrm_state *__find_acq_core(struct net *net, 1004 const struct xfrm_mark *m, 1005 unsigned short family, u8 mode, 1006 u32 reqid, u8 proto, 1007 const xfrm_address_t *daddr, 1008 const xfrm_address_t *saddr, 1009 int create) 1010 { 1011 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); 1012 struct xfrm_state *x; 1013 u32 mark = m->v & m->m; 1014 1015 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1016 if (x->props.reqid != reqid || 1017 x->props.mode != mode || 1018 x->props.family != family || 1019 x->km.state != XFRM_STATE_ACQ || 1020 x->id.spi != 0 || 1021 x->id.proto != proto || 1022 (mark & x->mark.m) != x->mark.v || 1023 !xfrm_addr_equal(&x->id.daddr, daddr, family) || 1024 !xfrm_addr_equal(&x->props.saddr, saddr, family)) 1025 continue; 1026 1027 xfrm_state_hold(x); 1028 return x; 1029 } 1030 1031 if (!create) 1032 return NULL; 1033 1034 x = xfrm_state_alloc(net); 1035 if (likely(x)) { 1036 switch (family) { 1037 case AF_INET: 1038 x->sel.daddr.a4 = daddr->a4; 1039 x->sel.saddr.a4 = saddr->a4; 1040 x->sel.prefixlen_d = 32; 1041 x->sel.prefixlen_s = 32; 1042 x->props.saddr.a4 = saddr->a4; 1043 x->id.daddr.a4 = daddr->a4; 1044 break; 1045 1046 case AF_INET6: 1047 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr; 1048 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr; 1049 x->sel.prefixlen_d = 128; 1050 x->sel.prefixlen_s = 128; 1051 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr; 1052 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr; 1053 break; 1054 } 1055 1056 x->km.state = XFRM_STATE_ACQ; 1057 x->id.proto = proto; 1058 x->props.family = family; 1059 x->props.mode = mode; 1060 x->props.reqid = reqid; 1061 x->mark.v = m->v; 1062 x->mark.m = m->m; 1063 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; 1064 xfrm_state_hold(x); 1065 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); 1066 list_add(&x->km.all, &net->xfrm.state_all); 1067 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); 1068 h = xfrm_src_hash(net, daddr, saddr, family); 1069 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); 1070 1071 net->xfrm.state_num++; 1072 1073 xfrm_hash_grow_check(net, x->bydst.next != NULL); 1074 } 1075 1076 return x; 1077 } 1078 1079 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1080 1081 int xfrm_state_add(struct xfrm_state *x) 1082 { 1083 struct net *net = xs_net(x); 1084 struct xfrm_state *x1, *to_put; 1085 int family; 1086 int err; 1087 u32 mark = x->mark.v & x->mark.m; 1088 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1089 1090 family = x->props.family; 1091 1092 to_put = NULL; 1093 1094 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1095 1096 x1 = __xfrm_state_locate(x, use_spi, family); 1097 if (x1) { 1098 to_put = x1; 1099 x1 = NULL; 1100 err = -EEXIST; 1101 goto out; 1102 } 1103 1104 if (use_spi && x->km.seq) { 1105 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); 1106 if (x1 && ((x1->id.proto != x->id.proto) || 1107 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { 1108 to_put = x1; 1109 x1 = NULL; 1110 } 1111 } 1112 1113 if (use_spi && !x1) 1114 x1 = __find_acq_core(net, &x->mark, family, x->props.mode, 1115 x->props.reqid, x->id.proto, 1116 &x->id.daddr, &x->props.saddr, 0); 1117 1118 __xfrm_state_bump_genids(x); 1119 __xfrm_state_insert(x); 1120 err = 0; 1121 1122 out: 1123 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1124 1125 if (x1) { 1126 xfrm_state_delete(x1); 1127 xfrm_state_put(x1); 1128 } 1129 1130 if (to_put) 1131 xfrm_state_put(to_put); 1132 1133 return err; 1134 } 1135 EXPORT_SYMBOL(xfrm_state_add); 1136 1137 #ifdef CONFIG_XFRM_MIGRATE 1138 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) 1139 { 1140 struct net *net = xs_net(orig); 1141 int err = -ENOMEM; 1142 struct xfrm_state *x = xfrm_state_alloc(net); 1143 if (!x) 1144 goto out; 1145 1146 memcpy(&x->id, &orig->id, sizeof(x->id)); 1147 memcpy(&x->sel, &orig->sel, sizeof(x->sel)); 1148 memcpy(&x->lft, &orig->lft, sizeof(x->lft)); 1149 x->props.mode = orig->props.mode; 1150 x->props.replay_window = orig->props.replay_window; 1151 x->props.reqid = orig->props.reqid; 1152 x->props.family = orig->props.family; 1153 x->props.saddr = orig->props.saddr; 1154 1155 if (orig->aalg) { 1156 x->aalg = xfrm_algo_auth_clone(orig->aalg); 1157 if (!x->aalg) 1158 goto error; 1159 } 1160 x->props.aalgo = orig->props.aalgo; 1161 1162 if (orig->aead) { 1163 x->aead = xfrm_algo_aead_clone(orig->aead); 1164 if (!x->aead) 1165 goto error; 1166 } 1167 if (orig->ealg) { 1168 x->ealg = xfrm_algo_clone(orig->ealg); 1169 if (!x->ealg) 1170 goto error; 1171 } 1172 x->props.ealgo = orig->props.ealgo; 1173 1174 if (orig->calg) { 1175 x->calg = xfrm_algo_clone(orig->calg); 1176 if (!x->calg) 1177 goto error; 1178 } 1179 x->props.calgo = orig->props.calgo; 1180 1181 if (orig->encap) { 1182 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); 1183 if (!x->encap) 1184 goto error; 1185 } 1186 1187 if (orig->coaddr) { 1188 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), 1189 GFP_KERNEL); 1190 if (!x->coaddr) 1191 goto error; 1192 } 1193 1194 if (orig->replay_esn) { 1195 err = xfrm_replay_clone(x, orig); 1196 if (err) 1197 goto error; 1198 } 1199 1200 memcpy(&x->mark, &orig->mark, sizeof(x->mark)); 1201 1202 err = xfrm_init_state(x); 1203 if (err) 1204 goto error; 1205 1206 x->props.flags = orig->props.flags; 1207 x->props.extra_flags = orig->props.extra_flags; 1208 1209 x->tfcpad = orig->tfcpad; 1210 x->replay_maxdiff = orig->replay_maxdiff; 1211 x->replay_maxage = orig->replay_maxage; 1212 x->curlft.add_time = orig->curlft.add_time; 1213 x->km.state = orig->km.state; 1214 x->km.seq = orig->km.seq; 1215 1216 return x; 1217 1218 error: 1219 xfrm_state_put(x); 1220 out: 1221 if (errp) 1222 *errp = err; 1223 return NULL; 1224 } 1225 1226 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) 1227 { 1228 unsigned int h; 1229 struct xfrm_state *x = NULL; 1230 1231 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1232 1233 if (m->reqid) { 1234 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, 1235 m->reqid, m->old_family); 1236 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { 1237 if (x->props.mode != m->mode || 1238 x->id.proto != m->proto) 1239 continue; 1240 if (m->reqid && x->props.reqid != m->reqid) 1241 continue; 1242 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1243 m->old_family) || 1244 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1245 m->old_family)) 1246 continue; 1247 xfrm_state_hold(x); 1248 break; 1249 } 1250 } else { 1251 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, 1252 m->old_family); 1253 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { 1254 if (x->props.mode != m->mode || 1255 x->id.proto != m->proto) 1256 continue; 1257 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, 1258 m->old_family) || 1259 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, 1260 m->old_family)) 1261 continue; 1262 xfrm_state_hold(x); 1263 break; 1264 } 1265 } 1266 1267 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1268 1269 return x; 1270 } 1271 EXPORT_SYMBOL(xfrm_migrate_state_find); 1272 1273 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1274 struct xfrm_migrate *m) 1275 { 1276 struct xfrm_state *xc; 1277 int err; 1278 1279 xc = xfrm_state_clone(x, &err); 1280 if (!xc) 1281 return NULL; 1282 1283 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); 1284 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); 1285 1286 /* add state */ 1287 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { 1288 /* a care is needed when the destination address of the 1289 state is to be updated as it is a part of triplet */ 1290 xfrm_state_insert(xc); 1291 } else { 1292 if ((err = xfrm_state_add(xc)) < 0) 1293 goto error; 1294 } 1295 1296 return xc; 1297 error: 1298 xfrm_state_put(xc); 1299 return NULL; 1300 } 1301 EXPORT_SYMBOL(xfrm_state_migrate); 1302 #endif 1303 1304 int xfrm_state_update(struct xfrm_state *x) 1305 { 1306 struct xfrm_state *x1, *to_put; 1307 int err; 1308 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); 1309 struct net *net = xs_net(x); 1310 1311 to_put = NULL; 1312 1313 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1314 x1 = __xfrm_state_locate(x, use_spi, x->props.family); 1315 1316 err = -ESRCH; 1317 if (!x1) 1318 goto out; 1319 1320 if (xfrm_state_kern(x1)) { 1321 to_put = x1; 1322 err = -EEXIST; 1323 goto out; 1324 } 1325 1326 if (x1->km.state == XFRM_STATE_ACQ) { 1327 __xfrm_state_insert(x); 1328 x = NULL; 1329 } 1330 err = 0; 1331 1332 out: 1333 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1334 1335 if (to_put) 1336 xfrm_state_put(to_put); 1337 1338 if (err) 1339 return err; 1340 1341 if (!x) { 1342 xfrm_state_delete(x1); 1343 xfrm_state_put(x1); 1344 return 0; 1345 } 1346 1347 err = -EINVAL; 1348 spin_lock_bh(&x1->lock); 1349 if (likely(x1->km.state == XFRM_STATE_VALID)) { 1350 if (x->encap && x1->encap) 1351 memcpy(x1->encap, x->encap, sizeof(*x1->encap)); 1352 if (x->coaddr && x1->coaddr) { 1353 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); 1354 } 1355 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) 1356 memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); 1357 memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); 1358 x1->km.dying = 0; 1359 1360 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); 1361 if (x1->curlft.use_time) 1362 xfrm_state_check_expire(x1); 1363 1364 err = 0; 1365 x->km.state = XFRM_STATE_DEAD; 1366 __xfrm_state_put(x); 1367 } 1368 spin_unlock_bh(&x1->lock); 1369 1370 xfrm_state_put(x1); 1371 1372 return err; 1373 } 1374 EXPORT_SYMBOL(xfrm_state_update); 1375 1376 int xfrm_state_check_expire(struct xfrm_state *x) 1377 { 1378 if (!x->curlft.use_time) 1379 x->curlft.use_time = get_seconds(); 1380 1381 if (x->curlft.bytes >= x->lft.hard_byte_limit || 1382 x->curlft.packets >= x->lft.hard_packet_limit) { 1383 x->km.state = XFRM_STATE_EXPIRED; 1384 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL); 1385 return -EINVAL; 1386 } 1387 1388 if (!x->km.dying && 1389 (x->curlft.bytes >= x->lft.soft_byte_limit || 1390 x->curlft.packets >= x->lft.soft_packet_limit)) { 1391 x->km.dying = 1; 1392 km_state_expired(x, 0, 0); 1393 } 1394 return 0; 1395 } 1396 EXPORT_SYMBOL(xfrm_state_check_expire); 1397 1398 struct xfrm_state * 1399 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, 1400 u8 proto, unsigned short family) 1401 { 1402 struct xfrm_state *x; 1403 1404 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1405 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); 1406 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1407 return x; 1408 } 1409 EXPORT_SYMBOL(xfrm_state_lookup); 1410 1411 struct xfrm_state * 1412 xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1413 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1414 u8 proto, unsigned short family) 1415 { 1416 struct xfrm_state *x; 1417 1418 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1419 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); 1420 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1421 return x; 1422 } 1423 EXPORT_SYMBOL(xfrm_state_lookup_byaddr); 1424 1425 struct xfrm_state * 1426 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, 1427 u8 proto, const xfrm_address_t *daddr, 1428 const xfrm_address_t *saddr, int create, unsigned short family) 1429 { 1430 struct xfrm_state *x; 1431 1432 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1433 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); 1434 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1435 1436 return x; 1437 } 1438 EXPORT_SYMBOL(xfrm_find_acq); 1439 1440 #ifdef CONFIG_XFRM_SUB_POLICY 1441 int 1442 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1443 unsigned short family, struct net *net) 1444 { 1445 int err = 0; 1446 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1447 if (!afinfo) 1448 return -EAFNOSUPPORT; 1449 1450 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ 1451 if (afinfo->tmpl_sort) 1452 err = afinfo->tmpl_sort(dst, src, n); 1453 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1454 xfrm_state_put_afinfo(afinfo); 1455 return err; 1456 } 1457 EXPORT_SYMBOL(xfrm_tmpl_sort); 1458 1459 int 1460 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1461 unsigned short family) 1462 { 1463 int err = 0; 1464 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); 1465 struct net *net = xs_net(*src); 1466 1467 if (!afinfo) 1468 return -EAFNOSUPPORT; 1469 1470 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1471 if (afinfo->state_sort) 1472 err = afinfo->state_sort(dst, src, n); 1473 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1474 xfrm_state_put_afinfo(afinfo); 1475 return err; 1476 } 1477 EXPORT_SYMBOL(xfrm_state_sort); 1478 #endif 1479 1480 /* Silly enough, but I'm lazy to build resolution list */ 1481 1482 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1483 { 1484 int i; 1485 1486 for (i = 0; i <= net->xfrm.state_hmask; i++) { 1487 struct xfrm_state *x; 1488 1489 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { 1490 if (x->km.seq == seq && 1491 (mark & x->mark.m) == x->mark.v && 1492 x->km.state == XFRM_STATE_ACQ) { 1493 xfrm_state_hold(x); 1494 return x; 1495 } 1496 } 1497 } 1498 return NULL; 1499 } 1500 1501 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) 1502 { 1503 struct xfrm_state *x; 1504 1505 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1506 x = __xfrm_find_acq_byseq(net, mark, seq); 1507 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1508 return x; 1509 } 1510 EXPORT_SYMBOL(xfrm_find_acq_byseq); 1511 1512 u32 xfrm_get_acqseq(void) 1513 { 1514 u32 res; 1515 static atomic_t acqseq; 1516 1517 do { 1518 res = atomic_inc_return(&acqseq); 1519 } while (!res); 1520 1521 return res; 1522 } 1523 EXPORT_SYMBOL(xfrm_get_acqseq); 1524 1525 int verify_spi_info(u8 proto, u32 min, u32 max) 1526 { 1527 switch (proto) { 1528 case IPPROTO_AH: 1529 case IPPROTO_ESP: 1530 break; 1531 1532 case IPPROTO_COMP: 1533 /* IPCOMP spi is 16-bits. */ 1534 if (max >= 0x10000) 1535 return -EINVAL; 1536 break; 1537 1538 default: 1539 return -EINVAL; 1540 } 1541 1542 if (min > max) 1543 return -EINVAL; 1544 1545 return 0; 1546 } 1547 EXPORT_SYMBOL(verify_spi_info); 1548 1549 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) 1550 { 1551 struct net *net = xs_net(x); 1552 unsigned int h; 1553 struct xfrm_state *x0; 1554 int err = -ENOENT; 1555 __be32 minspi = htonl(low); 1556 __be32 maxspi = htonl(high); 1557 u32 mark = x->mark.v & x->mark.m; 1558 1559 spin_lock_bh(&x->lock); 1560 if (x->km.state == XFRM_STATE_DEAD) 1561 goto unlock; 1562 1563 err = 0; 1564 if (x->id.spi) 1565 goto unlock; 1566 1567 err = -ENOENT; 1568 1569 if (minspi == maxspi) { 1570 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); 1571 if (x0) { 1572 xfrm_state_put(x0); 1573 goto unlock; 1574 } 1575 x->id.spi = minspi; 1576 } else { 1577 u32 spi = 0; 1578 for (h = 0; h < high-low+1; h++) { 1579 spi = low + prandom_u32()%(high-low+1); 1580 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); 1581 if (x0 == NULL) { 1582 x->id.spi = htonl(spi); 1583 break; 1584 } 1585 xfrm_state_put(x0); 1586 } 1587 } 1588 if (x->id.spi) { 1589 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1590 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); 1591 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); 1592 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1593 1594 err = 0; 1595 } 1596 1597 unlock: 1598 spin_unlock_bh(&x->lock); 1599 1600 return err; 1601 } 1602 EXPORT_SYMBOL(xfrm_alloc_spi); 1603 1604 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1605 int (*func)(struct xfrm_state *, int, void*), 1606 void *data) 1607 { 1608 struct xfrm_state *state; 1609 struct xfrm_state_walk *x; 1610 int err = 0; 1611 1612 if (walk->seq != 0 && list_empty(&walk->all)) 1613 return 0; 1614 1615 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1616 if (list_empty(&walk->all)) 1617 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); 1618 else 1619 x = list_entry(&walk->all, struct xfrm_state_walk, all); 1620 list_for_each_entry_from(x, &net->xfrm.state_all, all) { 1621 if (x->state == XFRM_STATE_DEAD) 1622 continue; 1623 state = container_of(x, struct xfrm_state, km); 1624 if (!xfrm_id_proto_match(state->id.proto, walk->proto)) 1625 continue; 1626 err = func(state, walk->seq, data); 1627 if (err) { 1628 list_move_tail(&walk->all, &x->all); 1629 goto out; 1630 } 1631 walk->seq++; 1632 } 1633 if (walk->seq == 0) { 1634 err = -ENOENT; 1635 goto out; 1636 } 1637 list_del_init(&walk->all); 1638 out: 1639 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1640 return err; 1641 } 1642 EXPORT_SYMBOL(xfrm_state_walk); 1643 1644 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1645 { 1646 INIT_LIST_HEAD(&walk->all); 1647 walk->proto = proto; 1648 walk->state = XFRM_STATE_DEAD; 1649 walk->seq = 0; 1650 } 1651 EXPORT_SYMBOL(xfrm_state_walk_init); 1652 1653 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) 1654 { 1655 if (list_empty(&walk->all)) 1656 return; 1657 1658 spin_lock_bh(&net->xfrm.xfrm_state_lock); 1659 list_del(&walk->all); 1660 spin_unlock_bh(&net->xfrm.xfrm_state_lock); 1661 } 1662 EXPORT_SYMBOL(xfrm_state_walk_done); 1663 1664 static void xfrm_replay_timer_handler(unsigned long data) 1665 { 1666 struct xfrm_state *x = (struct xfrm_state *)data; 1667 1668 spin_lock(&x->lock); 1669 1670 if (x->km.state == XFRM_STATE_VALID) { 1671 if (xfrm_aevent_is_on(xs_net(x))) 1672 x->repl->notify(x, XFRM_REPLAY_TIMEOUT); 1673 else 1674 x->xflags |= XFRM_TIME_DEFER; 1675 } 1676 1677 spin_unlock(&x->lock); 1678 } 1679 1680 static LIST_HEAD(xfrm_km_list); 1681 1682 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 1683 { 1684 struct xfrm_mgr *km; 1685 1686 rcu_read_lock(); 1687 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1688 if (km->notify_policy) 1689 km->notify_policy(xp, dir, c); 1690 rcu_read_unlock(); 1691 } 1692 1693 void km_state_notify(struct xfrm_state *x, const struct km_event *c) 1694 { 1695 struct xfrm_mgr *km; 1696 rcu_read_lock(); 1697 list_for_each_entry_rcu(km, &xfrm_km_list, list) 1698 if (km->notify) 1699 km->notify(x, c); 1700 rcu_read_unlock(); 1701 } 1702 1703 EXPORT_SYMBOL(km_policy_notify); 1704 EXPORT_SYMBOL(km_state_notify); 1705 1706 void km_state_expired(struct xfrm_state *x, int hard, u32 portid) 1707 { 1708 struct km_event c; 1709 1710 c.data.hard = hard; 1711 c.portid = portid; 1712 c.event = XFRM_MSG_EXPIRE; 1713 km_state_notify(x, &c); 1714 } 1715 1716 EXPORT_SYMBOL(km_state_expired); 1717 /* 1718 * We send to all registered managers regardless of failure 1719 * We are happy with one success 1720 */ 1721 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) 1722 { 1723 int err = -EINVAL, acqret; 1724 struct xfrm_mgr *km; 1725 1726 rcu_read_lock(); 1727 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1728 acqret = km->acquire(x, t, pol); 1729 if (!acqret) 1730 err = acqret; 1731 } 1732 rcu_read_unlock(); 1733 return err; 1734 } 1735 EXPORT_SYMBOL(km_query); 1736 1737 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 1738 { 1739 int err = -EINVAL; 1740 struct xfrm_mgr *km; 1741 1742 rcu_read_lock(); 1743 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1744 if (km->new_mapping) 1745 err = km->new_mapping(x, ipaddr, sport); 1746 if (!err) 1747 break; 1748 } 1749 rcu_read_unlock(); 1750 return err; 1751 } 1752 EXPORT_SYMBOL(km_new_mapping); 1753 1754 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) 1755 { 1756 struct km_event c; 1757 1758 c.data.hard = hard; 1759 c.portid = portid; 1760 c.event = XFRM_MSG_POLEXPIRE; 1761 km_policy_notify(pol, dir, &c); 1762 } 1763 EXPORT_SYMBOL(km_policy_expired); 1764 1765 #ifdef CONFIG_XFRM_MIGRATE 1766 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1767 const struct xfrm_migrate *m, int num_migrate, 1768 const struct xfrm_kmaddress *k) 1769 { 1770 int err = -EINVAL; 1771 int ret; 1772 struct xfrm_mgr *km; 1773 1774 rcu_read_lock(); 1775 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1776 if (km->migrate) { 1777 ret = km->migrate(sel, dir, type, m, num_migrate, k); 1778 if (!ret) 1779 err = ret; 1780 } 1781 } 1782 rcu_read_unlock(); 1783 return err; 1784 } 1785 EXPORT_SYMBOL(km_migrate); 1786 #endif 1787 1788 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) 1789 { 1790 int err = -EINVAL; 1791 int ret; 1792 struct xfrm_mgr *km; 1793 1794 rcu_read_lock(); 1795 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1796 if (km->report) { 1797 ret = km->report(net, proto, sel, addr); 1798 if (!ret) 1799 err = ret; 1800 } 1801 } 1802 rcu_read_unlock(); 1803 return err; 1804 } 1805 EXPORT_SYMBOL(km_report); 1806 1807 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1808 { 1809 int err; 1810 u8 *data; 1811 struct xfrm_mgr *km; 1812 struct xfrm_policy *pol = NULL; 1813 1814 if (optlen <= 0 || optlen > PAGE_SIZE) 1815 return -EMSGSIZE; 1816 1817 data = kmalloc(optlen, GFP_KERNEL); 1818 if (!data) 1819 return -ENOMEM; 1820 1821 err = -EFAULT; 1822 if (copy_from_user(data, optval, optlen)) 1823 goto out; 1824 1825 err = -EINVAL; 1826 rcu_read_lock(); 1827 list_for_each_entry_rcu(km, &xfrm_km_list, list) { 1828 pol = km->compile_policy(sk, optname, data, 1829 optlen, &err); 1830 if (err >= 0) 1831 break; 1832 } 1833 rcu_read_unlock(); 1834 1835 if (err >= 0) { 1836 xfrm_sk_policy_insert(sk, err, pol); 1837 xfrm_pol_put(pol); 1838 err = 0; 1839 } 1840 1841 out: 1842 kfree(data); 1843 return err; 1844 } 1845 EXPORT_SYMBOL(xfrm_user_policy); 1846 1847 static DEFINE_SPINLOCK(xfrm_km_lock); 1848 1849 int xfrm_register_km(struct xfrm_mgr *km) 1850 { 1851 spin_lock_bh(&xfrm_km_lock); 1852 list_add_tail_rcu(&km->list, &xfrm_km_list); 1853 spin_unlock_bh(&xfrm_km_lock); 1854 return 0; 1855 } 1856 EXPORT_SYMBOL(xfrm_register_km); 1857 1858 int xfrm_unregister_km(struct xfrm_mgr *km) 1859 { 1860 spin_lock_bh(&xfrm_km_lock); 1861 list_del_rcu(&km->list); 1862 spin_unlock_bh(&xfrm_km_lock); 1863 synchronize_rcu(); 1864 return 0; 1865 } 1866 EXPORT_SYMBOL(xfrm_unregister_km); 1867 1868 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) 1869 { 1870 int err = 0; 1871 if (unlikely(afinfo == NULL)) 1872 return -EINVAL; 1873 if (unlikely(afinfo->family >= NPROTO)) 1874 return -EAFNOSUPPORT; 1875 spin_lock_bh(&xfrm_state_afinfo_lock); 1876 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) 1877 err = -ENOBUFS; 1878 else 1879 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); 1880 spin_unlock_bh(&xfrm_state_afinfo_lock); 1881 return err; 1882 } 1883 EXPORT_SYMBOL(xfrm_state_register_afinfo); 1884 1885 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) 1886 { 1887 int err = 0; 1888 if (unlikely(afinfo == NULL)) 1889 return -EINVAL; 1890 if (unlikely(afinfo->family >= NPROTO)) 1891 return -EAFNOSUPPORT; 1892 spin_lock_bh(&xfrm_state_afinfo_lock); 1893 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { 1894 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) 1895 err = -EINVAL; 1896 else 1897 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); 1898 } 1899 spin_unlock_bh(&xfrm_state_afinfo_lock); 1900 synchronize_rcu(); 1901 return err; 1902 } 1903 EXPORT_SYMBOL(xfrm_state_unregister_afinfo); 1904 1905 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) 1906 { 1907 struct xfrm_state_afinfo *afinfo; 1908 if (unlikely(family >= NPROTO)) 1909 return NULL; 1910 rcu_read_lock(); 1911 afinfo = rcu_dereference(xfrm_state_afinfo[family]); 1912 if (unlikely(!afinfo)) 1913 rcu_read_unlock(); 1914 return afinfo; 1915 } 1916 1917 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) 1918 { 1919 rcu_read_unlock(); 1920 } 1921 1922 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ 1923 void xfrm_state_delete_tunnel(struct xfrm_state *x) 1924 { 1925 if (x->tunnel) { 1926 struct xfrm_state *t = x->tunnel; 1927 1928 if (atomic_read(&t->tunnel_users) == 2) 1929 xfrm_state_delete(t); 1930 atomic_dec(&t->tunnel_users); 1931 xfrm_state_put(t); 1932 x->tunnel = NULL; 1933 } 1934 } 1935 EXPORT_SYMBOL(xfrm_state_delete_tunnel); 1936 1937 int xfrm_state_mtu(struct xfrm_state *x, int mtu) 1938 { 1939 int res; 1940 1941 spin_lock_bh(&x->lock); 1942 if (x->km.state == XFRM_STATE_VALID && 1943 x->type && x->type->get_mtu) 1944 res = x->type->get_mtu(x, mtu); 1945 else 1946 res = mtu - x->props.header_len; 1947 spin_unlock_bh(&x->lock); 1948 return res; 1949 } 1950 1951 int __xfrm_init_state(struct xfrm_state *x, bool init_replay) 1952 { 1953 struct xfrm_state_afinfo *afinfo; 1954 struct xfrm_mode *inner_mode; 1955 int family = x->props.family; 1956 int err; 1957 1958 err = -EAFNOSUPPORT; 1959 afinfo = xfrm_state_get_afinfo(family); 1960 if (!afinfo) 1961 goto error; 1962 1963 err = 0; 1964 if (afinfo->init_flags) 1965 err = afinfo->init_flags(x); 1966 1967 xfrm_state_put_afinfo(afinfo); 1968 1969 if (err) 1970 goto error; 1971 1972 err = -EPROTONOSUPPORT; 1973 1974 if (x->sel.family != AF_UNSPEC) { 1975 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); 1976 if (inner_mode == NULL) 1977 goto error; 1978 1979 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && 1980 family != x->sel.family) { 1981 xfrm_put_mode(inner_mode); 1982 goto error; 1983 } 1984 1985 x->inner_mode = inner_mode; 1986 } else { 1987 struct xfrm_mode *inner_mode_iaf; 1988 int iafamily = AF_INET; 1989 1990 inner_mode = xfrm_get_mode(x->props.mode, x->props.family); 1991 if (inner_mode == NULL) 1992 goto error; 1993 1994 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { 1995 xfrm_put_mode(inner_mode); 1996 goto error; 1997 } 1998 x->inner_mode = inner_mode; 1999 2000 if (x->props.family == AF_INET) 2001 iafamily = AF_INET6; 2002 2003 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); 2004 if (inner_mode_iaf) { 2005 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) 2006 x->inner_mode_iaf = inner_mode_iaf; 2007 else 2008 xfrm_put_mode(inner_mode_iaf); 2009 } 2010 } 2011 2012 x->type = xfrm_get_type(x->id.proto, family); 2013 if (x->type == NULL) 2014 goto error; 2015 2016 err = x->type->init_state(x); 2017 if (err) 2018 goto error; 2019 2020 x->outer_mode = xfrm_get_mode(x->props.mode, family); 2021 if (x->outer_mode == NULL) { 2022 err = -EPROTONOSUPPORT; 2023 goto error; 2024 } 2025 2026 if (init_replay) { 2027 err = xfrm_init_replay(x); 2028 if (err) 2029 goto error; 2030 } 2031 2032 x->km.state = XFRM_STATE_VALID; 2033 2034 error: 2035 return err; 2036 } 2037 2038 EXPORT_SYMBOL(__xfrm_init_state); 2039 2040 int xfrm_init_state(struct xfrm_state *x) 2041 { 2042 return __xfrm_init_state(x, true); 2043 } 2044 2045 EXPORT_SYMBOL(xfrm_init_state); 2046 2047 int __net_init xfrm_state_init(struct net *net) 2048 { 2049 unsigned int sz; 2050 2051 INIT_LIST_HEAD(&net->xfrm.state_all); 2052 2053 sz = sizeof(struct hlist_head) * 8; 2054 2055 net->xfrm.state_bydst = xfrm_hash_alloc(sz); 2056 if (!net->xfrm.state_bydst) 2057 goto out_bydst; 2058 net->xfrm.state_bysrc = xfrm_hash_alloc(sz); 2059 if (!net->xfrm.state_bysrc) 2060 goto out_bysrc; 2061 net->xfrm.state_byspi = xfrm_hash_alloc(sz); 2062 if (!net->xfrm.state_byspi) 2063 goto out_byspi; 2064 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); 2065 2066 net->xfrm.state_num = 0; 2067 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); 2068 INIT_HLIST_HEAD(&net->xfrm.state_gc_list); 2069 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); 2070 spin_lock_init(&net->xfrm.xfrm_state_lock); 2071 return 0; 2072 2073 out_byspi: 2074 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2075 out_bysrc: 2076 xfrm_hash_free(net->xfrm.state_bydst, sz); 2077 out_bydst: 2078 return -ENOMEM; 2079 } 2080 2081 void xfrm_state_fini(struct net *net) 2082 { 2083 struct xfrm_audit audit_info; 2084 unsigned int sz; 2085 2086 flush_work(&net->xfrm.state_hash_work); 2087 audit_info.loginuid = INVALID_UID; 2088 audit_info.sessionid = (unsigned int)-1; 2089 audit_info.secid = 0; 2090 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); 2091 flush_work(&net->xfrm.state_gc_work); 2092 2093 WARN_ON(!list_empty(&net->xfrm.state_all)); 2094 2095 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); 2096 WARN_ON(!hlist_empty(net->xfrm.state_byspi)); 2097 xfrm_hash_free(net->xfrm.state_byspi, sz); 2098 WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); 2099 xfrm_hash_free(net->xfrm.state_bysrc, sz); 2100 WARN_ON(!hlist_empty(net->xfrm.state_bydst)); 2101 xfrm_hash_free(net->xfrm.state_bydst, sz); 2102 } 2103 2104 #ifdef CONFIG_AUDITSYSCALL 2105 static void xfrm_audit_helper_sainfo(struct xfrm_state *x, 2106 struct audit_buffer *audit_buf) 2107 { 2108 struct xfrm_sec_ctx *ctx = x->security; 2109 u32 spi = ntohl(x->id.spi); 2110 2111 if (ctx) 2112 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", 2113 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); 2114 2115 switch (x->props.family) { 2116 case AF_INET: 2117 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2118 &x->props.saddr.a4, &x->id.daddr.a4); 2119 break; 2120 case AF_INET6: 2121 audit_log_format(audit_buf, " src=%pI6 dst=%pI6", 2122 x->props.saddr.a6, x->id.daddr.a6); 2123 break; 2124 } 2125 2126 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2127 } 2128 2129 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, 2130 struct audit_buffer *audit_buf) 2131 { 2132 const struct iphdr *iph4; 2133 const struct ipv6hdr *iph6; 2134 2135 switch (family) { 2136 case AF_INET: 2137 iph4 = ip_hdr(skb); 2138 audit_log_format(audit_buf, " src=%pI4 dst=%pI4", 2139 &iph4->saddr, &iph4->daddr); 2140 break; 2141 case AF_INET6: 2142 iph6 = ipv6_hdr(skb); 2143 audit_log_format(audit_buf, 2144 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", 2145 &iph6->saddr, &iph6->daddr, 2146 iph6->flow_lbl[0] & 0x0f, 2147 iph6->flow_lbl[1], 2148 iph6->flow_lbl[2]); 2149 break; 2150 } 2151 } 2152 2153 void xfrm_audit_state_add(struct xfrm_state *x, int result, 2154 kuid_t auid, unsigned int sessionid, u32 secid) 2155 { 2156 struct audit_buffer *audit_buf; 2157 2158 audit_buf = xfrm_audit_start("SAD-add"); 2159 if (audit_buf == NULL) 2160 return; 2161 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2162 xfrm_audit_helper_sainfo(x, audit_buf); 2163 audit_log_format(audit_buf, " res=%u", result); 2164 audit_log_end(audit_buf); 2165 } 2166 EXPORT_SYMBOL_GPL(xfrm_audit_state_add); 2167 2168 void xfrm_audit_state_delete(struct xfrm_state *x, int result, 2169 kuid_t auid, unsigned int sessionid, u32 secid) 2170 { 2171 struct audit_buffer *audit_buf; 2172 2173 audit_buf = xfrm_audit_start("SAD-delete"); 2174 if (audit_buf == NULL) 2175 return; 2176 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); 2177 xfrm_audit_helper_sainfo(x, audit_buf); 2178 audit_log_format(audit_buf, " res=%u", result); 2179 audit_log_end(audit_buf); 2180 } 2181 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); 2182 2183 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 2184 struct sk_buff *skb) 2185 { 2186 struct audit_buffer *audit_buf; 2187 u32 spi; 2188 2189 audit_buf = xfrm_audit_start("SA-replay-overflow"); 2190 if (audit_buf == NULL) 2191 return; 2192 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2193 /* don't record the sequence number because it's inherent in this kind 2194 * of audit message */ 2195 spi = ntohl(x->id.spi); 2196 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); 2197 audit_log_end(audit_buf); 2198 } 2199 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); 2200 2201 void xfrm_audit_state_replay(struct xfrm_state *x, 2202 struct sk_buff *skb, __be32 net_seq) 2203 { 2204 struct audit_buffer *audit_buf; 2205 u32 spi; 2206 2207 audit_buf = xfrm_audit_start("SA-replayed-pkt"); 2208 if (audit_buf == NULL) 2209 return; 2210 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2211 spi = ntohl(x->id.spi); 2212 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2213 spi, spi, ntohl(net_seq)); 2214 audit_log_end(audit_buf); 2215 } 2216 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); 2217 2218 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) 2219 { 2220 struct audit_buffer *audit_buf; 2221 2222 audit_buf = xfrm_audit_start("SA-notfound"); 2223 if (audit_buf == NULL) 2224 return; 2225 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2226 audit_log_end(audit_buf); 2227 } 2228 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); 2229 2230 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 2231 __be32 net_spi, __be32 net_seq) 2232 { 2233 struct audit_buffer *audit_buf; 2234 u32 spi; 2235 2236 audit_buf = xfrm_audit_start("SA-notfound"); 2237 if (audit_buf == NULL) 2238 return; 2239 xfrm_audit_helper_pktinfo(skb, family, audit_buf); 2240 spi = ntohl(net_spi); 2241 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2242 spi, spi, ntohl(net_seq)); 2243 audit_log_end(audit_buf); 2244 } 2245 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); 2246 2247 void xfrm_audit_state_icvfail(struct xfrm_state *x, 2248 struct sk_buff *skb, u8 proto) 2249 { 2250 struct audit_buffer *audit_buf; 2251 __be32 net_spi; 2252 __be32 net_seq; 2253 2254 audit_buf = xfrm_audit_start("SA-icv-failure"); 2255 if (audit_buf == NULL) 2256 return; 2257 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); 2258 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { 2259 u32 spi = ntohl(net_spi); 2260 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", 2261 spi, spi, ntohl(net_seq)); 2262 } 2263 audit_log_end(audit_buf); 2264 } 2265 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); 2266 #endif /* CONFIG_AUDITSYSCALL */ 2267