net/xfrm/xfrm_state.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * xfrm_state.c
   4  *
   5  * Changes:
   6  *      Mitsuru KANDA @USAGI
   7  *      Kazunori MIYAZAWA @USAGI
   8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              IPv6 support
  10  *      YOSHIFUJI Hideaki @USAGI
  11  *              Split up af-specific functions
  12  *      Derek Atkins <derek@ihtfp.com>
  13  *              Add UDP Encapsulation
  14  *
  15  */
  16
  17 #include <linux/workqueue.h>
  18 #include <net/xfrm.h>
  19 #include <linux/pfkeyv2.h>
  20 #include <linux/ipsec.h>
  21 #include <linux/module.h>
  22 #include <linux/cache.h>
  23 #include <linux/audit.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/ktime.h>
  26 #include <linux/slab.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/kernel.h>
  29
  30 #include <crypto/aead.h>
  31
  32 #include "xfrm_hash.h"
  33
  34 #define xfrm_state_deref_prot(table, net) \
  35         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  36
  37 static void xfrm_state_gc_task(struct work_struct *work);
  38
  39 /* Each xfrm_state may be linked to two tables:
  40
  41    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  42    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  43       destination/tunnel endpoint. (output)
  44  */
  45
  46 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  47 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
  48 static struct kmem_cache *xfrm_state_cache __ro_after_init;
  49
  50 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  51 static HLIST_HEAD(xfrm_state_gc_list);
  52
  53 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  54 {
  55         return refcount_inc_not_zero(&x->refcnt);
  56 }
  57
  58 static inline unsigned int xfrm_dst_hash(struct net *net,
  59                                          const xfrm_address_t *daddr,
  60                                          const xfrm_address_t *saddr,
  61                                          u32 reqid,
  62                                          unsigned short family)
  63 {
  64         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  65 }
  66
  67 static inline unsigned int xfrm_src_hash(struct net *net,
  68                                          const xfrm_address_t *daddr,
  69                                          const xfrm_address_t *saddr,
  70                                          unsigned short family)
  71 {
  72         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  73 }
  74
  75 static inline unsigned int
  76 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  77               __be32 spi, u8 proto, unsigned short family)
  78 {
  79         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  80 }
  81
  82 static void xfrm_hash_transfer(struct hlist_head *list,
  83                                struct hlist_head *ndsttable,
  84                                struct hlist_head *nsrctable,
  85                                struct hlist_head *nspitable,
  86                                unsigned int nhashmask)
  87 {
  88         struct hlist_node *tmp;
  89         struct xfrm_state *x;
  90
  91         hlist_for_each_entry_safe(x, tmp, list, bydst) {
  92                 unsigned int h;
  93
  94                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  95                                     x->props.reqid, x->props.family,
  96                                     nhashmask);
  97                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
  98
  99                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 100                                     x->props.family,
 101                                     nhashmask);
 102                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 103
 104                 if (x->id.spi) {
 105                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 106                                             x->id.proto, x->props.family,
 107                                             nhashmask);
 108                         hlist_add_head_rcu(&x->byspi, nspitable + h);
 109                 }
 110         }
 111 }
 112
 113 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 114 {
 115         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 116 }
 117
 118 static void xfrm_hash_resize(struct work_struct *work)
 119 {
 120         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 121         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 122         unsigned long nsize, osize;
 123         unsigned int nhashmask, ohashmask;
 124         int i;
 125
 126         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 127         ndst = xfrm_hash_alloc(nsize);
 128         if (!ndst)
 129                 return;
 130         nsrc = xfrm_hash_alloc(nsize);
 131         if (!nsrc) {
 132                 xfrm_hash_free(ndst, nsize);
 133                 return;
 134         }
 135         nspi = xfrm_hash_alloc(nsize);
 136         if (!nspi) {
 137                 xfrm_hash_free(ndst, nsize);
 138                 xfrm_hash_free(nsrc, nsize);
 139                 return;
 140         }
 141
 142         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 143         write_seqcount_begin(&xfrm_state_hash_generation);
 144
 145         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 146         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
 147         for (i = net->xfrm.state_hmask; i >= 0; i--)
 148                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
 149
 150         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
 151         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
 152         ohashmask = net->xfrm.state_hmask;
 153
 154         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
 155         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
 156         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
 157         net->xfrm.state_hmask = nhashmask;
 158
 159         write_seqcount_end(&xfrm_state_hash_generation);
 160         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 161
 162         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 163
 164         synchronize_rcu();
 165
 166         xfrm_hash_free(odst, osize);
 167         xfrm_hash_free(osrc, osize);
 168         xfrm_hash_free(ospi, osize);
 169 }
 170
 171 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 172 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 173
 174 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 175
 176 int __xfrm_state_delete(struct xfrm_state *x);
 177
 178 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 179 static bool km_is_alive(const struct km_event *c);
 180 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 181
 182 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 183 {
 184         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 185         int err = 0;
 186
 187         if (!afinfo)
 188                 return -EAFNOSUPPORT;
 189
 190 #define X(afi, T, name) do {                    \
 191                 WARN_ON((afi)->type_ ## name);  \
 192                 (afi)->type_ ## name = (T);     \
 193         } while (0)
 194
 195         switch (type->proto) {
 196         case IPPROTO_COMP:
 197                 X(afinfo, type, comp);
 198                 break;
 199         case IPPROTO_AH:
 200                 X(afinfo, type, ah);
 201                 break;
 202         case IPPROTO_ESP:
 203                 X(afinfo, type, esp);
 204                 break;
 205         case IPPROTO_IPIP:
 206                 X(afinfo, type, ipip);
 207                 break;
 208         case IPPROTO_DSTOPTS:
 209                 X(afinfo, type, dstopts);
 210                 break;
 211         case IPPROTO_ROUTING:
 212                 X(afinfo, type, routing);
 213                 break;
 214         case IPPROTO_IPV6:
 215                 X(afinfo, type, ipip6);
 216                 break;
 217         default:
 218                 WARN_ON(1);
 219                 err = -EPROTONOSUPPORT;
 220                 break;
 221         }
 222 #undef X
 223         rcu_read_unlock();
 224         return err;
 225 }
 226 EXPORT_SYMBOL(xfrm_register_type);
 227
 228 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 229 {
 230         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 231
 232         if (unlikely(afinfo == NULL))
 233                 return;
 234
 235 #define X(afi, T, name) do {                            \
 236                 WARN_ON((afi)->type_ ## name != (T));   \
 237                 (afi)->type_ ## name = NULL;            \
 238         } while (0)
 239
 240         switch (type->proto) {
 241         case IPPROTO_COMP:
 242                 X(afinfo, type, comp);
 243                 break;
 244         case IPPROTO_AH:
 245                 X(afinfo, type, ah);
 246                 break;
 247         case IPPROTO_ESP:
 248                 X(afinfo, type, esp);
 249                 break;
 250         case IPPROTO_IPIP:
 251                 X(afinfo, type, ipip);
 252                 break;
 253         case IPPROTO_DSTOPTS:
 254                 X(afinfo, type, dstopts);
 255                 break;
 256         case IPPROTO_ROUTING:
 257                 X(afinfo, type, routing);
 258                 break;
 259         case IPPROTO_IPV6:
 260                 X(afinfo, type, ipip6);
 261                 break;
 262         default:
 263                 WARN_ON(1);
 264                 break;
 265         }
 266 #undef X
 267         rcu_read_unlock();
 268 }
 269 EXPORT_SYMBOL(xfrm_unregister_type);
 270
 271 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 272 {
 273         const struct xfrm_type *type = NULL;
 274         struct xfrm_state_afinfo *afinfo;
 275         int modload_attempted = 0;
 276
 277 retry:
 278         afinfo = xfrm_state_get_afinfo(family);
 279         if (unlikely(afinfo == NULL))
 280                 return NULL;
 281
 282         switch (proto) {
 283         case IPPROTO_COMP:
 284                 type = afinfo->type_comp;
 285                 break;
 286         case IPPROTO_AH:
 287                 type = afinfo->type_ah;
 288                 break;
 289         case IPPROTO_ESP:
 290                 type = afinfo->type_esp;
 291                 break;
 292         case IPPROTO_IPIP:
 293                 type = afinfo->type_ipip;
 294                 break;
 295         case IPPROTO_DSTOPTS:
 296                 type = afinfo->type_dstopts;
 297                 break;
 298         case IPPROTO_ROUTING:
 299                 type = afinfo->type_routing;
 300                 break;
 301         case IPPROTO_IPV6:
 302                 type = afinfo->type_ipip6;
 303                 break;
 304         default:
 305                 break;
 306         }
 307
 308         if (unlikely(type && !try_module_get(type->owner)))
 309                 type = NULL;
 310
 311         rcu_read_unlock();
 312
 313         if (!type && !modload_attempted) {
 314                 request_module("xfrm-type-%d-%d", family, proto);
 315                 modload_attempted = 1;
 316                 goto retry;
 317         }
 318
 319         return type;
 320 }
 321
 322 static void xfrm_put_type(const struct xfrm_type *type)
 323 {
 324         module_put(type->owner);
 325 }
 326
 327 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
 328                                unsigned short family)
 329 {
 330         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 331         int err = 0;
 332
 333         if (unlikely(afinfo == NULL))
 334                 return -EAFNOSUPPORT;
 335
 336         switch (type->proto) {
 337         case IPPROTO_ESP:
 338                 WARN_ON(afinfo->type_offload_esp);
 339                 afinfo->type_offload_esp = type;
 340                 break;
 341         default:
 342                 WARN_ON(1);
 343                 err = -EPROTONOSUPPORT;
 344                 break;
 345         }
 346
 347         rcu_read_unlock();
 348         return err;
 349 }
 350 EXPORT_SYMBOL(xfrm_register_type_offload);
 351
 352 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
 353                                   unsigned short family)
 354 {
 355         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 356
 357         if (unlikely(afinfo == NULL))
 358                 return;
 359
 360         switch (type->proto) {
 361         case IPPROTO_ESP:
 362                 WARN_ON(afinfo->type_offload_esp != type);
 363                 afinfo->type_offload_esp = NULL;
 364                 break;
 365         default:
 366                 WARN_ON(1);
 367                 break;
 368         }
 369         rcu_read_unlock();
 370 }
 371 EXPORT_SYMBOL(xfrm_unregister_type_offload);
 372
 373 static const struct xfrm_type_offload *
 374 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
 375 {
 376         const struct xfrm_type_offload *type = NULL;
 377         struct xfrm_state_afinfo *afinfo;
 378
 379 retry:
 380         afinfo = xfrm_state_get_afinfo(family);
 381         if (unlikely(afinfo == NULL))
 382                 return NULL;
 383
 384         switch (proto) {
 385         case IPPROTO_ESP:
 386                 type = afinfo->type_offload_esp;
 387                 break;
 388         default:
 389                 break;
 390         }
 391
 392         if ((type && !try_module_get(type->owner)))
 393                 type = NULL;
 394
 395         rcu_read_unlock();
 396
 397         if (!type && try_load) {
 398                 request_module("xfrm-offload-%d-%d", family, proto);
 399                 try_load = false;
 400                 goto retry;
 401         }
 402
 403         return type;
 404 }
 405
 406 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
 407 {
 408         module_put(type->owner);
 409 }
 410
 411 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
 412         [XFRM_MODE_BEET] = {
 413                 .encap = XFRM_MODE_BEET,
 414                 .flags = XFRM_MODE_FLAG_TUNNEL,
 415                 .family = AF_INET,
 416         },
 417         [XFRM_MODE_TRANSPORT] = {
 418                 .encap = XFRM_MODE_TRANSPORT,
 419                 .family = AF_INET,
 420         },
 421         [XFRM_MODE_TUNNEL] = {
 422                 .encap = XFRM_MODE_TUNNEL,
 423                 .flags = XFRM_MODE_FLAG_TUNNEL,
 424                 .family = AF_INET,
 425         },
 426 };
 427
 428 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
 429         [XFRM_MODE_BEET] = {
 430                 .encap = XFRM_MODE_BEET,
 431                 .flags = XFRM_MODE_FLAG_TUNNEL,
 432                 .family = AF_INET6,
 433         },
 434         [XFRM_MODE_ROUTEOPTIMIZATION] = {
 435                 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 436                 .family = AF_INET6,
 437         },
 438         [XFRM_MODE_TRANSPORT] = {
 439                 .encap = XFRM_MODE_TRANSPORT,
 440                 .family = AF_INET6,
 441         },
 442         [XFRM_MODE_TUNNEL] = {
 443                 .encap = XFRM_MODE_TUNNEL,
 444                 .flags = XFRM_MODE_FLAG_TUNNEL,
 445                 .family = AF_INET6,
 446         },
 447 };
 448
 449 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 450 {
 451         const struct xfrm_mode *mode;
 452
 453         if (unlikely(encap >= XFRM_MODE_MAX))
 454                 return NULL;
 455
 456         switch (family) {
 457         case AF_INET:
 458                 mode = &xfrm4_mode_map[encap];
 459                 if (mode->family == family)
 460                         return mode;
 461                 break;
 462         case AF_INET6:
 463                 mode = &xfrm6_mode_map[encap];
 464                 if (mode->family == family)
 465                         return mode;
 466                 break;
 467         default:
 468                 break;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 void xfrm_state_free(struct xfrm_state *x)
 475 {
 476         kmem_cache_free(xfrm_state_cache, x);
 477 }
 478 EXPORT_SYMBOL(xfrm_state_free);
 479
 480 static void ___xfrm_state_destroy(struct xfrm_state *x)
 481 {
 482         hrtimer_cancel(&x->mtimer);
 483         del_timer_sync(&x->rtimer);
 484         kfree(x->aead);
 485         kfree(x->aalg);
 486         kfree(x->ealg);
 487         kfree(x->calg);
 488         kfree(x->encap);
 489         kfree(x->coaddr);
 490         kfree(x->replay_esn);
 491         kfree(x->preplay_esn);
 492         if (x->type_offload)
 493                 xfrm_put_type_offload(x->type_offload);
 494         if (x->type) {
 495                 x->type->destructor(x);
 496                 xfrm_put_type(x->type);
 497         }
 498         if (x->xfrag.page)
 499                 put_page(x->xfrag.page);
 500         xfrm_dev_state_free(x);
 501         security_xfrm_state_free(x);
 502         xfrm_state_free(x);
 503 }
 504
 505 static void xfrm_state_gc_task(struct work_struct *work)
 506 {
 507         struct xfrm_state *x;
 508         struct hlist_node *tmp;
 509         struct hlist_head gc_list;
 510
 511         spin_lock_bh(&xfrm_state_gc_lock);
 512         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 513         spin_unlock_bh(&xfrm_state_gc_lock);
 514
 515         synchronize_rcu();
 516
 517         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 518                 ___xfrm_state_destroy(x);
 519 }
 520
 521 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 522 {
 523         struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
 524         enum hrtimer_restart ret = HRTIMER_NORESTART;
 525         time64_t now = ktime_get_real_seconds();
 526         time64_t next = TIME64_MAX;
 527         int warn = 0;
 528         int err = 0;
 529
 530         spin_lock(&x->lock);
 531         if (x->km.state == XFRM_STATE_DEAD)
 532                 goto out;
 533         if (x->km.state == XFRM_STATE_EXPIRED)
 534                 goto expired;
 535         if (x->lft.hard_add_expires_seconds) {
 536                 long tmo = x->lft.hard_add_expires_seconds +
 537                         x->curlft.add_time - now;
 538                 if (tmo <= 0) {
 539                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 540                                 /* enter hard expire without soft expire first?!
 541                                  * setting a new date could trigger this.
 542                                  * workaround: fix x->curflt.add_time by below:
 543                                  */
 544                                 x->curlft.add_time = now - x->saved_tmo - 1;
 545                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 546                         } else
 547                                 goto expired;
 548                 }
 549                 if (tmo < next)
 550                         next = tmo;
 551         }
 552         if (x->lft.hard_use_expires_seconds) {
 553                 long tmo = x->lft.hard_use_expires_seconds +
 554                         (x->curlft.use_time ? : now) - now;
 555                 if (tmo <= 0)
 556                         goto expired;
 557                 if (tmo < next)
 558                         next = tmo;
 559         }
 560         if (x->km.dying)
 561                 goto resched;
 562         if (x->lft.soft_add_expires_seconds) {
 563                 long tmo = x->lft.soft_add_expires_seconds +
 564                         x->curlft.add_time - now;
 565                 if (tmo <= 0) {
 566                         warn = 1;
 567                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 568                 } else if (tmo < next) {
 569                         next = tmo;
 570                         x->xflags |= XFRM_SOFT_EXPIRE;
 571                         x->saved_tmo = tmo;
 572                 }
 573         }
 574         if (x->lft.soft_use_expires_seconds) {
 575                 long tmo = x->lft.soft_use_expires_seconds +
 576                         (x->curlft.use_time ? : now) - now;
 577                 if (tmo <= 0)
 578                         warn = 1;
 579                 else if (tmo < next)
 580                         next = tmo;
 581         }
 582
 583         x->km.dying = warn;
 584         if (warn)
 585                 km_state_expired(x, 0, 0);
 586 resched:
 587         if (next != TIME64_MAX) {
 588                 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
 589                 ret = HRTIMER_RESTART;
 590         }
 591
 592         goto out;
 593
 594 expired:
 595         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 596                 x->km.state = XFRM_STATE_EXPIRED;
 597
 598         err = __xfrm_state_delete(x);
 599         if (!err)
 600                 km_state_expired(x, 1, 0);
 601
 602         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 603
 604 out:
 605         spin_unlock(&x->lock);
 606         return ret;
 607 }
 608
 609 static void xfrm_replay_timer_handler(struct timer_list *t);
 610
 611 struct xfrm_state *xfrm_state_alloc(struct net *net)
 612 {
 613         struct xfrm_state *x;
 614
 615         x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
 616
 617         if (x) {
 618                 write_pnet(&x->xs_net, net);
 619                 refcount_set(&x->refcnt, 1);
 620                 atomic_set(&x->tunnel_users, 0);
 621                 INIT_LIST_HEAD(&x->km.all);
 622                 INIT_HLIST_NODE(&x->bydst);
 623                 INIT_HLIST_NODE(&x->bysrc);
 624                 INIT_HLIST_NODE(&x->byspi);
 625                 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
 626                 x->mtimer.function = xfrm_timer_handler;
 627                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
 628                 x->curlft.add_time = ktime_get_real_seconds();
 629                 x->lft.soft_byte_limit = XFRM_INF;
 630                 x->lft.soft_packet_limit = XFRM_INF;
 631                 x->lft.hard_byte_limit = XFRM_INF;
 632                 x->lft.hard_packet_limit = XFRM_INF;
 633                 x->replay_maxage = 0;
 634                 x->replay_maxdiff = 0;
 635                 spin_lock_init(&x->lock);
 636         }
 637         return x;
 638 }
 639 EXPORT_SYMBOL(xfrm_state_alloc);
 640
 641 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
 642 {
 643         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 644
 645         if (sync) {
 646                 synchronize_rcu();
 647                 ___xfrm_state_destroy(x);
 648         } else {
 649                 spin_lock_bh(&xfrm_state_gc_lock);
 650                 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
 651                 spin_unlock_bh(&xfrm_state_gc_lock);
 652                 schedule_work(&xfrm_state_gc_work);
 653         }
 654 }
 655 EXPORT_SYMBOL(__xfrm_state_destroy);
 656
 657 int __xfrm_state_delete(struct xfrm_state *x)
 658 {
 659         struct net *net = xs_net(x);
 660         int err = -ESRCH;
 661
 662         if (x->km.state != XFRM_STATE_DEAD) {
 663                 x->km.state = XFRM_STATE_DEAD;
 664                 spin_lock(&net->xfrm.xfrm_state_lock);
 665                 list_del(&x->km.all);
 666                 hlist_del_rcu(&x->bydst);
 667                 hlist_del_rcu(&x->bysrc);
 668                 if (x->id.spi)
 669                         hlist_del_rcu(&x->byspi);
 670                 net->xfrm.state_num--;
 671                 spin_unlock(&net->xfrm.xfrm_state_lock);
 672
 673                 if (x->encap_sk)
 674                         sock_put(rcu_dereference_raw(x->encap_sk));
 675
 676                 xfrm_dev_state_delete(x);
 677
 678                 /* All xfrm_state objects are created by xfrm_state_alloc.
 679                  * The xfrm_state_alloc call gives a reference, and that
 680                  * is what we are dropping here.
 681                  */
 682                 xfrm_state_put(x);
 683                 err = 0;
 684         }
 685
 686         return err;
 687 }
 688 EXPORT_SYMBOL(__xfrm_state_delete);
 689
 690 int xfrm_state_delete(struct xfrm_state *x)
 691 {
 692         int err;
 693
 694         spin_lock_bh(&x->lock);
 695         err = __xfrm_state_delete(x);
 696         spin_unlock_bh(&x->lock);
 697
 698         return err;
 699 }
 700 EXPORT_SYMBOL(xfrm_state_delete);
 701
 702 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 703 static inline int
 704 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 705 {
 706         int i, err = 0;
 707
 708         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 709                 struct xfrm_state *x;
 710
 711                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 712                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 713                            (err = security_xfrm_state_delete(x)) != 0) {
 714                                 xfrm_audit_state_delete(x, 0, task_valid);
 715                                 return err;
 716                         }
 717                 }
 718         }
 719
 720         return err;
 721 }
 722
 723 static inline int
 724 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 725 {
 726         int i, err = 0;
 727
 728         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 729                 struct xfrm_state *x;
 730                 struct xfrm_state_offload *xso;
 731
 732                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 733                         xso = &x->xso;
 734
 735                         if (xso->dev == dev &&
 736                            (err = security_xfrm_state_delete(x)) != 0) {
 737                                 xfrm_audit_state_delete(x, 0, task_valid);
 738                                 return err;
 739                         }
 740                 }
 741         }
 742
 743         return err;
 744 }
 745 #else
 746 static inline int
 747 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 748 {
 749         return 0;
 750 }
 751
 752 static inline int
 753 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 754 {
 755         return 0;
 756 }
 757 #endif
 758
 759 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
 760 {
 761         int i, err = 0, cnt = 0;
 762
 763         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 764         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 765         if (err)
 766                 goto out;
 767
 768         err = -ESRCH;
 769         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 770                 struct xfrm_state *x;
 771 restart:
 772                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 773                         if (!xfrm_state_kern(x) &&
 774                             xfrm_id_proto_match(x->id.proto, proto)) {
 775                                 xfrm_state_hold(x);
 776                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 777
 778                                 err = xfrm_state_delete(x);
 779                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 780                                                         task_valid);
 781                                 if (sync)
 782                                         xfrm_state_put_sync(x);
 783                                 else
 784                                         xfrm_state_put(x);
 785                                 if (!err)
 786                                         cnt++;
 787
 788                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 789                                 goto restart;
 790                         }
 791                 }
 792         }
 793 out:
 794         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 795         if (cnt)
 796                 err = 0;
 797
 798         return err;
 799 }
 800 EXPORT_SYMBOL(xfrm_state_flush);
 801
 802 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
 803 {
 804         int i, err = 0, cnt = 0;
 805
 806         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 807         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
 808         if (err)
 809                 goto out;
 810
 811         err = -ESRCH;
 812         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 813                 struct xfrm_state *x;
 814                 struct xfrm_state_offload *xso;
 815 restart:
 816                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 817                         xso = &x->xso;
 818
 819                         if (!xfrm_state_kern(x) && xso->dev == dev) {
 820                                 xfrm_state_hold(x);
 821                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 822
 823                                 err = xfrm_state_delete(x);
 824                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 825                                                         task_valid);
 826                                 xfrm_state_put(x);
 827                                 if (!err)
 828                                         cnt++;
 829
 830                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 831                                 goto restart;
 832                         }
 833                 }
 834         }
 835         if (cnt)
 836                 err = 0;
 837
 838 out:
 839         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 840         return err;
 841 }
 842 EXPORT_SYMBOL(xfrm_dev_state_flush);
 843
 844 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 845 {
 846         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 847         si->sadcnt = net->xfrm.state_num;
 848         si->sadhcnt = net->xfrm.state_hmask + 1;
 849         si->sadhmcnt = xfrm_state_hashmax;
 850         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 851 }
 852 EXPORT_SYMBOL(xfrm_sad_getinfo);
 853
 854 static void
 855 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 856 {
 857         const struct flowi4 *fl4 = &fl->u.ip4;
 858
 859         sel->daddr.a4 = fl4->daddr;
 860         sel->saddr.a4 = fl4->saddr;
 861         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 862         sel->dport_mask = htons(0xffff);
 863         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 864         sel->sport_mask = htons(0xffff);
 865         sel->family = AF_INET;
 866         sel->prefixlen_d = 32;
 867         sel->prefixlen_s = 32;
 868         sel->proto = fl4->flowi4_proto;
 869         sel->ifindex = fl4->flowi4_oif;
 870 }
 871
 872 static void
 873 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 874 {
 875         const struct flowi6 *fl6 = &fl->u.ip6;
 876
 877         /* Initialize temporary selector matching only to current session. */
 878         *(struct in6_addr *)&sel->daddr = fl6->daddr;
 879         *(struct in6_addr *)&sel->saddr = fl6->saddr;
 880         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
 881         sel->dport_mask = htons(0xffff);
 882         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
 883         sel->sport_mask = htons(0xffff);
 884         sel->family = AF_INET6;
 885         sel->prefixlen_d = 128;
 886         sel->prefixlen_s = 128;
 887         sel->proto = fl6->flowi6_proto;
 888         sel->ifindex = fl6->flowi6_oif;
 889 }
 890
 891 static void
 892 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 893                     const struct xfrm_tmpl *tmpl,
 894                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 895                     unsigned short family)
 896 {
 897         switch (family) {
 898         case AF_INET:
 899                 __xfrm4_init_tempsel(&x->sel, fl);
 900                 break;
 901         case AF_INET6:
 902                 __xfrm6_init_tempsel(&x->sel, fl);
 903                 break;
 904         }
 905
 906         x->id = tmpl->id;
 907
 908         switch (tmpl->encap_family) {
 909         case AF_INET:
 910                 if (x->id.daddr.a4 == 0)
 911                         x->id.daddr.a4 = daddr->a4;
 912                 x->props.saddr = tmpl->saddr;
 913                 if (x->props.saddr.a4 == 0)
 914                         x->props.saddr.a4 = saddr->a4;
 915                 break;
 916         case AF_INET6:
 917                 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
 918                         memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
 919                 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 920                 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
 921                         memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
 922                 break;
 923         }
 924
 925         x->props.mode = tmpl->mode;
 926         x->props.reqid = tmpl->reqid;
 927         x->props.family = tmpl->encap_family;
 928 }
 929
 930 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 931                                               const xfrm_address_t *daddr,
 932                                               __be32 spi, u8 proto,
 933                                               unsigned short family)
 934 {
 935         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 936         struct xfrm_state *x;
 937
 938         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 939                 if (x->props.family != family ||
 940                     x->id.spi       != spi ||
 941                     x->id.proto     != proto ||
 942                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 943                         continue;
 944
 945                 if ((mark & x->mark.m) != x->mark.v)
 946                         continue;
 947                 if (!xfrm_state_hold_rcu(x))
 948                         continue;
 949                 return x;
 950         }
 951
 952         return NULL;
 953 }
 954
 955 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 956                                                      const xfrm_address_t *daddr,
 957                                                      const xfrm_address_t *saddr,
 958                                                      u8 proto, unsigned short family)
 959 {
 960         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 961         struct xfrm_state *x;
 962
 963         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 964                 if (x->props.family != family ||
 965                     x->id.proto     != proto ||
 966                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 967                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 968                         continue;
 969
 970                 if ((mark & x->mark.m) != x->mark.v)
 971                         continue;
 972                 if (!xfrm_state_hold_rcu(x))
 973                         continue;
 974                 return x;
 975         }
 976
 977         return NULL;
 978 }
 979
 980 static inline struct xfrm_state *
 981 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 982 {
 983         struct net *net = xs_net(x);
 984         u32 mark = x->mark.v & x->mark.m;
 985
 986         if (use_spi)
 987                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
 988                                            x->id.spi, x->id.proto, family);
 989         else
 990                 return __xfrm_state_lookup_byaddr(net, mark,
 991                                                   &x->id.daddr,
 992                                                   &x->props.saddr,
 993                                                   x->id.proto, family);
 994 }
 995
 996 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 997 {
 998         if (have_hash_collision &&
 999             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1000             net->xfrm.state_num > net->xfrm.state_hmask)
1001                 schedule_work(&net->xfrm.state_hash_work);
1002 }
1003
1004 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1005                                const struct flowi *fl, unsigned short family,
1006                                struct xfrm_state **best, int *acq_in_progress,
1007                                int *error)
1008 {
1009         /* Resolution logic:
1010          * 1. There is a valid state with matching selector. Done.
1011          * 2. Valid state with inappropriate selector. Skip.
1012          *
1013          * Entering area of "sysdeps".
1014          *
1015          * 3. If state is not valid, selector is temporary, it selects
1016          *    only session which triggered previous resolution. Key
1017          *    manager will do something to install a state with proper
1018          *    selector.
1019          */
1020         if (x->km.state == XFRM_STATE_VALID) {
1021                 if ((x->sel.family &&
1022                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
1023                     !security_xfrm_state_pol_flow_match(x, pol, fl))
1024                         return;
1025
1026                 if (!*best ||
1027                     (*best)->km.dying > x->km.dying ||
1028                     ((*best)->km.dying == x->km.dying &&
1029                      (*best)->curlft.add_time < x->curlft.add_time))
1030                         *best = x;
1031         } else if (x->km.state == XFRM_STATE_ACQ) {
1032                 *acq_in_progress = 1;
1033         } else if (x->km.state == XFRM_STATE_ERROR ||
1034                    x->km.state == XFRM_STATE_EXPIRED) {
1035                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
1036                     security_xfrm_state_pol_flow_match(x, pol, fl))
1037                         *error = -ESRCH;
1038         }
1039 }
1040
1041 struct xfrm_state *
1042 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1043                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1044                 struct xfrm_policy *pol, int *err,
1045                 unsigned short family, u32 if_id)
1046 {
1047         static xfrm_address_t saddr_wildcard = { };
1048         struct net *net = xp_net(pol);
1049         unsigned int h, h_wildcard;
1050         struct xfrm_state *x, *x0, *to_put;
1051         int acquire_in_progress = 0;
1052         int error = 0;
1053         struct xfrm_state *best = NULL;
1054         u32 mark = pol->mark.v & pol->mark.m;
1055         unsigned short encap_family = tmpl->encap_family;
1056         unsigned int sequence;
1057         struct km_event c;
1058
1059         to_put = NULL;
1060
1061         sequence = read_seqcount_begin(&xfrm_state_hash_generation);
1062
1063         rcu_read_lock();
1064         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1065         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1066                 if (x->props.family == encap_family &&
1067                     x->props.reqid == tmpl->reqid &&
1068                     (mark & x->mark.m) == x->mark.v &&
1069                     x->if_id == if_id &&
1070                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1071                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1072                     tmpl->mode == x->props.mode &&
1073                     tmpl->id.proto == x->id.proto &&
1074                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1075                         xfrm_state_look_at(pol, x, fl, encap_family,
1076                                            &best, &acquire_in_progress, &error);
1077         }
1078         if (best || acquire_in_progress)
1079                 goto found;
1080
1081         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1082         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1083                 if (x->props.family == encap_family &&
1084                     x->props.reqid == tmpl->reqid &&
1085                     (mark & x->mark.m) == x->mark.v &&
1086                     x->if_id == if_id &&
1087                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1088                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1089                     tmpl->mode == x->props.mode &&
1090                     tmpl->id.proto == x->id.proto &&
1091                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1092                         xfrm_state_look_at(pol, x, fl, encap_family,
1093                                            &best, &acquire_in_progress, &error);
1094         }
1095
1096 found:
1097         x = best;
1098         if (!x && !error && !acquire_in_progress) {
1099                 if (tmpl->id.spi &&
1100                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1101                                               tmpl->id.proto, encap_family)) != NULL) {
1102                         to_put = x0;
1103                         error = -EEXIST;
1104                         goto out;
1105                 }
1106
1107                 c.net = net;
1108                 /* If the KMs have no listeners (yet...), avoid allocating an SA
1109                  * for each and every packet - garbage collection might not
1110                  * handle the flood.
1111                  */
1112                 if (!km_is_alive(&c)) {
1113                         error = -ESRCH;
1114                         goto out;
1115                 }
1116
1117                 x = xfrm_state_alloc(net);
1118                 if (x == NULL) {
1119                         error = -ENOMEM;
1120                         goto out;
1121                 }
1122                 /* Initialize temporary state matching only
1123                  * to current session. */
1124                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1125                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1126                 x->if_id = if_id;
1127
1128                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1129                 if (error) {
1130                         x->km.state = XFRM_STATE_DEAD;
1131                         to_put = x;
1132                         x = NULL;
1133                         goto out;
1134                 }
1135
1136                 if (km_query(x, tmpl, pol) == 0) {
1137                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1138                         x->km.state = XFRM_STATE_ACQ;
1139                         list_add(&x->km.all, &net->xfrm.state_all);
1140                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1141                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1142                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1143                         if (x->id.spi) {
1144                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1145                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1146                         }
1147                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1148                         hrtimer_start(&x->mtimer,
1149                                       ktime_set(net->xfrm.sysctl_acq_expires, 0),
1150                                       HRTIMER_MODE_REL_SOFT);
1151                         net->xfrm.state_num++;
1152                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1153                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1154                 } else {
1155                         x->km.state = XFRM_STATE_DEAD;
1156                         to_put = x;
1157                         x = NULL;
1158                         error = -ESRCH;
1159                 }
1160         }
1161 out:
1162         if (x) {
1163                 if (!xfrm_state_hold_rcu(x)) {
1164                         *err = -EAGAIN;
1165                         x = NULL;
1166                 }
1167         } else {
1168                 *err = acquire_in_progress ? -EAGAIN : error;
1169         }
1170         rcu_read_unlock();
1171         if (to_put)
1172                 xfrm_state_put(to_put);
1173
1174         if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1175                 *err = -EAGAIN;
1176                 if (x) {
1177                         xfrm_state_put(x);
1178                         x = NULL;
1179                 }
1180         }
1181
1182         return x;
1183 }
1184
1185 struct xfrm_state *
1186 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1187                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1188                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1189 {
1190         unsigned int h;
1191         struct xfrm_state *rx = NULL, *x = NULL;
1192
1193         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1194         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1195         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1196                 if (x->props.family == family &&
1197                     x->props.reqid == reqid &&
1198                     (mark & x->mark.m) == x->mark.v &&
1199                     x->if_id == if_id &&
1200                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1201                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1202                     mode == x->props.mode &&
1203                     proto == x->id.proto &&
1204                     x->km.state == XFRM_STATE_VALID) {
1205                         rx = x;
1206                         break;
1207                 }
1208         }
1209
1210         if (rx)
1211                 xfrm_state_hold(rx);
1212         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1213
1214
1215         return rx;
1216 }
1217 EXPORT_SYMBOL(xfrm_stateonly_find);
1218
1219 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1220                                               unsigned short family)
1221 {
1222         struct xfrm_state *x;
1223         struct xfrm_state_walk *w;
1224
1225         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1226         list_for_each_entry(w, &net->xfrm.state_all, all) {
1227                 x = container_of(w, struct xfrm_state, km);
1228                 if (x->props.family != family ||
1229                         x->id.spi != spi)
1230                         continue;
1231
1232                 xfrm_state_hold(x);
1233                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1234                 return x;
1235         }
1236         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1237         return NULL;
1238 }
1239 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1240
1241 static void __xfrm_state_insert(struct xfrm_state *x)
1242 {
1243         struct net *net = xs_net(x);
1244         unsigned int h;
1245
1246         list_add(&x->km.all, &net->xfrm.state_all);
1247
1248         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1249                           x->props.reqid, x->props.family);
1250         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1251
1252         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1253         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1254
1255         if (x->id.spi) {
1256                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1257                                   x->props.family);
1258
1259                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1260         }
1261
1262         hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1263         if (x->replay_maxage)
1264                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1265
1266         net->xfrm.state_num++;
1267
1268         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1269 }
1270
1271 /* net->xfrm.xfrm_state_lock is held */
1272 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1273 {
1274         struct net *net = xs_net(xnew);
1275         unsigned short family = xnew->props.family;
1276         u32 reqid = xnew->props.reqid;
1277         struct xfrm_state *x;
1278         unsigned int h;
1279         u32 mark = xnew->mark.v & xnew->mark.m;
1280         u32 if_id = xnew->if_id;
1281
1282         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1283         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1284                 if (x->props.family     == family &&
1285                     x->props.reqid      == reqid &&
1286                     x->if_id            == if_id &&
1287                     (mark & x->mark.m) == x->mark.v &&
1288                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1289                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1290                         x->genid++;
1291         }
1292 }
1293
1294 void xfrm_state_insert(struct xfrm_state *x)
1295 {
1296         struct net *net = xs_net(x);
1297
1298         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1299         __xfrm_state_bump_genids(x);
1300         __xfrm_state_insert(x);
1301         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1302 }
1303 EXPORT_SYMBOL(xfrm_state_insert);
1304
1305 /* net->xfrm.xfrm_state_lock is held */
1306 static struct xfrm_state *__find_acq_core(struct net *net,
1307                                           const struct xfrm_mark *m,
1308                                           unsigned short family, u8 mode,
1309                                           u32 reqid, u32 if_id, u8 proto,
1310                                           const xfrm_address_t *daddr,
1311                                           const xfrm_address_t *saddr,
1312                                           int create)
1313 {
1314         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1315         struct xfrm_state *x;
1316         u32 mark = m->v & m->m;
1317
1318         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1319                 if (x->props.reqid  != reqid ||
1320                     x->props.mode   != mode ||
1321                     x->props.family != family ||
1322                     x->km.state     != XFRM_STATE_ACQ ||
1323                     x->id.spi       != 0 ||
1324                     x->id.proto     != proto ||
1325                     (mark & x->mark.m) != x->mark.v ||
1326                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1327                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1328                         continue;
1329
1330                 xfrm_state_hold(x);
1331                 return x;
1332         }
1333
1334         if (!create)
1335                 return NULL;
1336
1337         x = xfrm_state_alloc(net);
1338         if (likely(x)) {
1339                 switch (family) {
1340                 case AF_INET:
1341                         x->sel.daddr.a4 = daddr->a4;
1342                         x->sel.saddr.a4 = saddr->a4;
1343                         x->sel.prefixlen_d = 32;
1344                         x->sel.prefixlen_s = 32;
1345                         x->props.saddr.a4 = saddr->a4;
1346                         x->id.daddr.a4 = daddr->a4;
1347                         break;
1348
1349                 case AF_INET6:
1350                         x->sel.daddr.in6 = daddr->in6;
1351                         x->sel.saddr.in6 = saddr->in6;
1352                         x->sel.prefixlen_d = 128;
1353                         x->sel.prefixlen_s = 128;
1354                         x->props.saddr.in6 = saddr->in6;
1355                         x->id.daddr.in6 = daddr->in6;
1356                         break;
1357                 }
1358
1359                 x->km.state = XFRM_STATE_ACQ;
1360                 x->id.proto = proto;
1361                 x->props.family = family;
1362                 x->props.mode = mode;
1363                 x->props.reqid = reqid;
1364                 x->if_id = if_id;
1365                 x->mark.v = m->v;
1366                 x->mark.m = m->m;
1367                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1368                 xfrm_state_hold(x);
1369                 hrtimer_start(&x->mtimer,
1370                               ktime_set(net->xfrm.sysctl_acq_expires, 0),
1371                               HRTIMER_MODE_REL_SOFT);
1372                 list_add(&x->km.all, &net->xfrm.state_all);
1373                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1374                 h = xfrm_src_hash(net, daddr, saddr, family);
1375                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1376
1377                 net->xfrm.state_num++;
1378
1379                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1380         }
1381
1382         return x;
1383 }
1384
1385 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1386
1387 int xfrm_state_add(struct xfrm_state *x)
1388 {
1389         struct net *net = xs_net(x);
1390         struct xfrm_state *x1, *to_put;
1391         int family;
1392         int err;
1393         u32 mark = x->mark.v & x->mark.m;
1394         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1395
1396         family = x->props.family;
1397
1398         to_put = NULL;
1399
1400         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1401
1402         x1 = __xfrm_state_locate(x, use_spi, family);
1403         if (x1) {
1404                 to_put = x1;
1405                 x1 = NULL;
1406                 err = -EEXIST;
1407                 goto out;
1408         }
1409
1410         if (use_spi && x->km.seq) {
1411                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1412                 if (x1 && ((x1->id.proto != x->id.proto) ||
1413                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1414                         to_put = x1;
1415                         x1 = NULL;
1416                 }
1417         }
1418
1419         if (use_spi && !x1)
1420                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1421                                      x->props.reqid, x->if_id, x->id.proto,
1422                                      &x->id.daddr, &x->props.saddr, 0);
1423
1424         __xfrm_state_bump_genids(x);
1425         __xfrm_state_insert(x);
1426         err = 0;
1427
1428 out:
1429         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1430
1431         if (x1) {
1432                 xfrm_state_delete(x1);
1433                 xfrm_state_put(x1);
1434         }
1435
1436         if (to_put)
1437                 xfrm_state_put(to_put);
1438
1439         return err;
1440 }
1441 EXPORT_SYMBOL(xfrm_state_add);
1442
1443 #ifdef CONFIG_XFRM_MIGRATE
1444 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1445                                            struct xfrm_encap_tmpl *encap)
1446 {
1447         struct net *net = xs_net(orig);
1448         struct xfrm_state *x = xfrm_state_alloc(net);
1449         if (!x)
1450                 goto out;
1451
1452         memcpy(&x->id, &orig->id, sizeof(x->id));
1453         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1454         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1455         x->props.mode = orig->props.mode;
1456         x->props.replay_window = orig->props.replay_window;
1457         x->props.reqid = orig->props.reqid;
1458         x->props.family = orig->props.family;
1459         x->props.saddr = orig->props.saddr;
1460
1461         if (orig->aalg) {
1462                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1463                 if (!x->aalg)
1464                         goto error;
1465         }
1466         x->props.aalgo = orig->props.aalgo;
1467
1468         if (orig->aead) {
1469                 x->aead = xfrm_algo_aead_clone(orig->aead);
1470                 x->geniv = orig->geniv;
1471                 if (!x->aead)
1472                         goto error;
1473         }
1474         if (orig->ealg) {
1475                 x->ealg = xfrm_algo_clone(orig->ealg);
1476                 if (!x->ealg)
1477                         goto error;
1478         }
1479         x->props.ealgo = orig->props.ealgo;
1480
1481         if (orig->calg) {
1482                 x->calg = xfrm_algo_clone(orig->calg);
1483                 if (!x->calg)
1484                         goto error;
1485         }
1486         x->props.calgo = orig->props.calgo;
1487
1488         if (encap || orig->encap) {
1489                 if (encap)
1490                         x->encap = kmemdup(encap, sizeof(*x->encap),
1491                                         GFP_KERNEL);
1492                 else
1493                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1494                                         GFP_KERNEL);
1495
1496                 if (!x->encap)
1497                         goto error;
1498         }
1499
1500         if (orig->coaddr) {
1501                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1502                                     GFP_KERNEL);
1503                 if (!x->coaddr)
1504                         goto error;
1505         }
1506
1507         if (orig->replay_esn) {
1508                 if (xfrm_replay_clone(x, orig))
1509                         goto error;
1510         }
1511
1512         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1513
1514         if (xfrm_init_state(x) < 0)
1515                 goto error;
1516
1517         x->props.flags = orig->props.flags;
1518         x->props.extra_flags = orig->props.extra_flags;
1519
1520         x->if_id = orig->if_id;
1521         x->tfcpad = orig->tfcpad;
1522         x->replay_maxdiff = orig->replay_maxdiff;
1523         x->replay_maxage = orig->replay_maxage;
1524         x->curlft.add_time = orig->curlft.add_time;
1525         x->km.state = orig->km.state;
1526         x->km.seq = orig->km.seq;
1527         x->replay = orig->replay;
1528         x->preplay = orig->preplay;
1529
1530         return x;
1531
1532  error:
1533         xfrm_state_put(x);
1534 out:
1535         return NULL;
1536 }
1537
1538 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1539 {
1540         unsigned int h;
1541         struct xfrm_state *x = NULL;
1542
1543         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1544
1545         if (m->reqid) {
1546                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1547                                   m->reqid, m->old_family);
1548                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1549                         if (x->props.mode != m->mode ||
1550                             x->id.proto != m->proto)
1551                                 continue;
1552                         if (m->reqid && x->props.reqid != m->reqid)
1553                                 continue;
1554                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1555                                              m->old_family) ||
1556                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1557                                              m->old_family))
1558                                 continue;
1559                         xfrm_state_hold(x);
1560                         break;
1561                 }
1562         } else {
1563                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1564                                   m->old_family);
1565                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1566                         if (x->props.mode != m->mode ||
1567                             x->id.proto != m->proto)
1568                                 continue;
1569                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1570                                              m->old_family) ||
1571                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1572                                              m->old_family))
1573                                 continue;
1574                         xfrm_state_hold(x);
1575                         break;
1576                 }
1577         }
1578
1579         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1580
1581         return x;
1582 }
1583 EXPORT_SYMBOL(xfrm_migrate_state_find);
1584
1585 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1586                                       struct xfrm_migrate *m,
1587                                       struct xfrm_encap_tmpl *encap)
1588 {
1589         struct xfrm_state *xc;
1590
1591         xc = xfrm_state_clone(x, encap);
1592         if (!xc)
1593                 return NULL;
1594
1595         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1596         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1597
1598         /* add state */
1599         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1600                 /* a care is needed when the destination address of the
1601                    state is to be updated as it is a part of triplet */
1602                 xfrm_state_insert(xc);
1603         } else {
1604                 if (xfrm_state_add(xc) < 0)
1605                         goto error;
1606         }
1607
1608         return xc;
1609 error:
1610         xfrm_state_put(xc);
1611         return NULL;
1612 }
1613 EXPORT_SYMBOL(xfrm_state_migrate);
1614 #endif
1615
1616 int xfrm_state_update(struct xfrm_state *x)
1617 {
1618         struct xfrm_state *x1, *to_put;
1619         int err;
1620         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1621         struct net *net = xs_net(x);
1622
1623         to_put = NULL;
1624
1625         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1626         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1627
1628         err = -ESRCH;
1629         if (!x1)
1630                 goto out;
1631
1632         if (xfrm_state_kern(x1)) {
1633                 to_put = x1;
1634                 err = -EEXIST;
1635                 goto out;
1636         }
1637
1638         if (x1->km.state == XFRM_STATE_ACQ) {
1639                 __xfrm_state_insert(x);
1640                 x = NULL;
1641         }
1642         err = 0;
1643
1644 out:
1645         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1646
1647         if (to_put)
1648                 xfrm_state_put(to_put);
1649
1650         if (err)
1651                 return err;
1652
1653         if (!x) {
1654                 xfrm_state_delete(x1);
1655                 xfrm_state_put(x1);
1656                 return 0;
1657         }
1658
1659         err = -EINVAL;
1660         spin_lock_bh(&x1->lock);
1661         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1662                 if (x->encap && x1->encap &&
1663                     x->encap->encap_type == x1->encap->encap_type)
1664                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1665                 else if (x->encap || x1->encap)
1666                         goto fail;
1667
1668                 if (x->coaddr && x1->coaddr) {
1669                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1670                 }
1671                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1672                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1673                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1674                 x1->km.dying = 0;
1675
1676                 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1677                               HRTIMER_MODE_REL_SOFT);
1678                 if (x1->curlft.use_time)
1679                         xfrm_state_check_expire(x1);
1680
1681                 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1682                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1683
1684                         if (x->props.smark.m || x->props.smark.v)
1685                                 x1->props.smark = x->props.smark;
1686
1687                         if (x->if_id)
1688                                 x1->if_id = x->if_id;
1689
1690                         __xfrm_state_bump_genids(x1);
1691                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1692                 }
1693
1694                 err = 0;
1695                 x->km.state = XFRM_STATE_DEAD;
1696                 __xfrm_state_put(x);
1697         }
1698
1699 fail:
1700         spin_unlock_bh(&x1->lock);
1701
1702         xfrm_state_put(x1);
1703
1704         return err;
1705 }
1706 EXPORT_SYMBOL(xfrm_state_update);
1707
1708 int xfrm_state_check_expire(struct xfrm_state *x)
1709 {
1710         if (!x->curlft.use_time)
1711                 x->curlft.use_time = ktime_get_real_seconds();
1712
1713         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1714             x->curlft.packets >= x->lft.hard_packet_limit) {
1715                 x->km.state = XFRM_STATE_EXPIRED;
1716                 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1717                 return -EINVAL;
1718         }
1719
1720         if (!x->km.dying &&
1721             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1722              x->curlft.packets >= x->lft.soft_packet_limit)) {
1723                 x->km.dying = 1;
1724                 km_state_expired(x, 0, 0);
1725         }
1726         return 0;
1727 }
1728 EXPORT_SYMBOL(xfrm_state_check_expire);
1729
1730 struct xfrm_state *
1731 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1732                   u8 proto, unsigned short family)
1733 {
1734         struct xfrm_state *x;
1735
1736         rcu_read_lock();
1737         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1738         rcu_read_unlock();
1739         return x;
1740 }
1741 EXPORT_SYMBOL(xfrm_state_lookup);
1742
1743 struct xfrm_state *
1744 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1745                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1746                          u8 proto, unsigned short family)
1747 {
1748         struct xfrm_state *x;
1749
1750         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1751         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1752         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1753         return x;
1754 }
1755 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1756
1757 struct xfrm_state *
1758 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1759               u32 if_id, u8 proto, const xfrm_address_t *daddr,
1760               const xfrm_address_t *saddr, int create, unsigned short family)
1761 {
1762         struct xfrm_state *x;
1763
1764         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1765         x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1766         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1767
1768         return x;
1769 }
1770 EXPORT_SYMBOL(xfrm_find_acq);
1771
1772 #ifdef CONFIG_XFRM_SUB_POLICY
1773 #if IS_ENABLED(CONFIG_IPV6)
1774 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1775 static void
1776 __xfrm6_sort(void **dst, void **src, int n,
1777              int (*cmp)(const void *p), int maxclass)
1778 {
1779         int count[XFRM_MAX_DEPTH] = { };
1780         int class[XFRM_MAX_DEPTH];
1781         int i;
1782
1783         for (i = 0; i < n; i++) {
1784                 int c = cmp(src[i]);
1785
1786                 class[i] = c;
1787                 count[c]++;
1788         }
1789
1790         for (i = 2; i < maxclass; i++)
1791                 count[i] += count[i - 1];
1792
1793         for (i = 0; i < n; i++) {
1794                 dst[count[class[i] - 1]++] = src[i];
1795                 src[i] = NULL;
1796         }
1797 }
1798
1799 /* Rule for xfrm_state:
1800  *
1801  * rule 1: select IPsec transport except AH
1802  * rule 2: select MIPv6 RO or inbound trigger
1803  * rule 3: select IPsec transport AH
1804  * rule 4: select IPsec tunnel
1805  * rule 5: others
1806  */
1807 static int __xfrm6_state_sort_cmp(const void *p)
1808 {
1809         const struct xfrm_state *v = p;
1810
1811         switch (v->props.mode) {
1812         case XFRM_MODE_TRANSPORT:
1813                 if (v->id.proto != IPPROTO_AH)
1814                         return 1;
1815                 else
1816                         return 3;
1817 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1818         case XFRM_MODE_ROUTEOPTIMIZATION:
1819         case XFRM_MODE_IN_TRIGGER:
1820                 return 2;
1821 #endif
1822         case XFRM_MODE_TUNNEL:
1823         case XFRM_MODE_BEET:
1824                 return 4;
1825         }
1826         return 5;
1827 }
1828
1829 /* Rule for xfrm_tmpl:
1830  *
1831  * rule 1: select IPsec transport
1832  * rule 2: select MIPv6 RO or inbound trigger
1833  * rule 3: select IPsec tunnel
1834  * rule 4: others
1835  */
1836 static int __xfrm6_tmpl_sort_cmp(const void *p)
1837 {
1838         const struct xfrm_tmpl *v = p;
1839
1840         switch (v->mode) {
1841         case XFRM_MODE_TRANSPORT:
1842                 return 1;
1843 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1844         case XFRM_MODE_ROUTEOPTIMIZATION:
1845         case XFRM_MODE_IN_TRIGGER:
1846                 return 2;
1847 #endif
1848         case XFRM_MODE_TUNNEL:
1849         case XFRM_MODE_BEET:
1850                 return 3;
1851         }
1852         return 4;
1853 }
1854 #else
1855 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1856 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1857
1858 static inline void
1859 __xfrm6_sort(void **dst, void **src, int n,
1860              int (*cmp)(const void *p), int maxclass)
1861 {
1862         int i;
1863
1864         for (i = 0; i < n; i++)
1865                 dst[i] = src[i];
1866 }
1867 #endif /* CONFIG_IPV6 */
1868
1869 void
1870 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1871                unsigned short family)
1872 {
1873         int i;
1874
1875         if (family == AF_INET6)
1876                 __xfrm6_sort((void **)dst, (void **)src, n,
1877                              __xfrm6_tmpl_sort_cmp, 5);
1878         else
1879                 for (i = 0; i < n; i++)
1880                         dst[i] = src[i];
1881 }
1882
1883 void
1884 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1885                 unsigned short family)
1886 {
1887         int i;
1888
1889         if (family == AF_INET6)
1890                 __xfrm6_sort((void **)dst, (void **)src, n,
1891                              __xfrm6_state_sort_cmp, 6);
1892         else
1893                 for (i = 0; i < n; i++)
1894                         dst[i] = src[i];
1895 }
1896 #endif
1897
1898 /* Silly enough, but I'm lazy to build resolution list */
1899
1900 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1901 {
1902         int i;
1903
1904         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1905                 struct xfrm_state *x;
1906
1907                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1908                         if (x->km.seq == seq &&
1909                             (mark & x->mark.m) == x->mark.v &&
1910                             x->km.state == XFRM_STATE_ACQ) {
1911                                 xfrm_state_hold(x);
1912                                 return x;
1913                         }
1914                 }
1915         }
1916         return NULL;
1917 }
1918
1919 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1920 {
1921         struct xfrm_state *x;
1922
1923         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1924         x = __xfrm_find_acq_byseq(net, mark, seq);
1925         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1926         return x;
1927 }
1928 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1929
1930 u32 xfrm_get_acqseq(void)
1931 {
1932         u32 res;
1933         static atomic_t acqseq;
1934
1935         do {
1936                 res = atomic_inc_return(&acqseq);
1937         } while (!res);
1938
1939         return res;
1940 }
1941 EXPORT_SYMBOL(xfrm_get_acqseq);
1942
1943 int verify_spi_info(u8 proto, u32 min, u32 max)
1944 {
1945         switch (proto) {
1946         case IPPROTO_AH:
1947         case IPPROTO_ESP:
1948                 break;
1949
1950         case IPPROTO_COMP:
1951                 /* IPCOMP spi is 16-bits. */
1952                 if (max >= 0x10000)
1953                         return -EINVAL;
1954                 break;
1955
1956         default:
1957                 return -EINVAL;
1958         }
1959
1960         if (min > max)
1961                 return -EINVAL;
1962
1963         return 0;
1964 }
1965 EXPORT_SYMBOL(verify_spi_info);
1966
1967 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1968 {
1969         struct net *net = xs_net(x);
1970         unsigned int h;
1971         struct xfrm_state *x0;
1972         int err = -ENOENT;
1973         __be32 minspi = htonl(low);
1974         __be32 maxspi = htonl(high);
1975         u32 mark = x->mark.v & x->mark.m;
1976
1977         spin_lock_bh(&x->lock);
1978         if (x->km.state == XFRM_STATE_DEAD)
1979                 goto unlock;
1980
1981         err = 0;
1982         if (x->id.spi)
1983                 goto unlock;
1984
1985         err = -ENOENT;
1986
1987         if (minspi == maxspi) {
1988                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1989                 if (x0) {
1990                         xfrm_state_put(x0);
1991                         goto unlock;
1992                 }
1993                 x->id.spi = minspi;
1994         } else {
1995                 u32 spi = 0;
1996                 for (h = 0; h < high-low+1; h++) {
1997                         spi = low + prandom_u32()%(high-low+1);
1998                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1999                         if (x0 == NULL) {
2000                                 x->id.spi = htonl(spi);
2001                                 break;
2002                         }
2003                         xfrm_state_put(x0);
2004                 }
2005         }
2006         if (x->id.spi) {
2007                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2008                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2009                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2010                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2011
2012                 err = 0;
2013         }
2014
2015 unlock:
2016         spin_unlock_bh(&x->lock);
2017
2018         return err;
2019 }
2020 EXPORT_SYMBOL(xfrm_alloc_spi);
2021
2022 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2023                                       struct xfrm_address_filter *filter)
2024 {
2025         if (filter) {
2026                 if ((filter->family == AF_INET ||
2027                      filter->family == AF_INET6) &&
2028                     x->props.family != filter->family)
2029                         return false;
2030
2031                 return addr_match(&x->props.saddr, &filter->saddr,
2032                                   filter->splen) &&
2033                        addr_match(&x->id.daddr, &filter->daddr,
2034                                   filter->dplen);
2035         }
2036         return true;
2037 }
2038
2039 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2040                     int (*func)(struct xfrm_state *, int, void*),
2041                     void *data)
2042 {
2043         struct xfrm_state *state;
2044         struct xfrm_state_walk *x;
2045         int err = 0;
2046
2047         if (walk->seq != 0 && list_empty(&walk->all))
2048                 return 0;
2049
2050         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2051         if (list_empty(&walk->all))
2052                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2053         else
2054                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2055         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2056                 if (x->state == XFRM_STATE_DEAD)
2057                         continue;
2058                 state = container_of(x, struct xfrm_state, km);
2059                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2060                         continue;
2061                 if (!__xfrm_state_filter_match(state, walk->filter))
2062                         continue;
2063                 err = func(state, walk->seq, data);
2064                 if (err) {
2065                         list_move_tail(&walk->all, &x->all);
2066                         goto out;
2067                 }
2068                 walk->seq++;
2069         }
2070         if (walk->seq == 0) {
2071                 err = -ENOENT;
2072                 goto out;
2073         }
2074         list_del_init(&walk->all);
2075 out:
2076         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2077         return err;
2078 }
2079 EXPORT_SYMBOL(xfrm_state_walk);
2080
2081 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2082                           struct xfrm_address_filter *filter)
2083 {
2084         INIT_LIST_HEAD(&walk->all);
2085         walk->proto = proto;
2086         walk->state = XFRM_STATE_DEAD;
2087         walk->seq = 0;
2088         walk->filter = filter;
2089 }
2090 EXPORT_SYMBOL(xfrm_state_walk_init);
2091
2092 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2093 {
2094         kfree(walk->filter);
2095
2096         if (list_empty(&walk->all))
2097                 return;
2098
2099         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2100         list_del(&walk->all);
2101         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2102 }
2103 EXPORT_SYMBOL(xfrm_state_walk_done);
2104
2105 static void xfrm_replay_timer_handler(struct timer_list *t)
2106 {
2107         struct xfrm_state *x = from_timer(x, t, rtimer);
2108
2109         spin_lock(&x->lock);
2110
2111         if (x->km.state == XFRM_STATE_VALID) {
2112                 if (xfrm_aevent_is_on(xs_net(x)))
2113                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2114                 else
2115                         x->xflags |= XFRM_TIME_DEFER;
2116         }
2117
2118         spin_unlock(&x->lock);
2119 }
2120
2121 static LIST_HEAD(xfrm_km_list);
2122
2123 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2124 {
2125         struct xfrm_mgr *km;
2126
2127         rcu_read_lock();
2128         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2129                 if (km->notify_policy)
2130                         km->notify_policy(xp, dir, c);
2131         rcu_read_unlock();
2132 }
2133
2134 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2135 {
2136         struct xfrm_mgr *km;
2137         rcu_read_lock();
2138         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2139                 if (km->notify)
2140                         km->notify(x, c);
2141         rcu_read_unlock();
2142 }
2143
2144 EXPORT_SYMBOL(km_policy_notify);
2145 EXPORT_SYMBOL(km_state_notify);
2146
2147 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2148 {
2149         struct km_event c;
2150
2151         c.data.hard = hard;
2152         c.portid = portid;
2153         c.event = XFRM_MSG_EXPIRE;
2154         km_state_notify(x, &c);
2155 }
2156
2157 EXPORT_SYMBOL(km_state_expired);
2158 /*
2159  * We send to all registered managers regardless of failure
2160  * We are happy with one success
2161 */
2162 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2163 {
2164         int err = -EINVAL, acqret;
2165         struct xfrm_mgr *km;
2166
2167         rcu_read_lock();
2168         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2169                 acqret = km->acquire(x, t, pol);
2170                 if (!acqret)
2171                         err = acqret;
2172         }
2173         rcu_read_unlock();
2174         return err;
2175 }
2176 EXPORT_SYMBOL(km_query);
2177
2178 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2179 {
2180         int err = -EINVAL;
2181         struct xfrm_mgr *km;
2182
2183         rcu_read_lock();
2184         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2185                 if (km->new_mapping)
2186                         err = km->new_mapping(x, ipaddr, sport);
2187                 if (!err)
2188                         break;
2189         }
2190         rcu_read_unlock();
2191         return err;
2192 }
2193 EXPORT_SYMBOL(km_new_mapping);
2194
2195 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2196 {
2197         struct km_event c;
2198
2199         c.data.hard = hard;
2200         c.portid = portid;
2201         c.event = XFRM_MSG_POLEXPIRE;
2202         km_policy_notify(pol, dir, &c);
2203 }
2204 EXPORT_SYMBOL(km_policy_expired);
2205
2206 #ifdef CONFIG_XFRM_MIGRATE
2207 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2208                const struct xfrm_migrate *m, int num_migrate,
2209                const struct xfrm_kmaddress *k,
2210                const struct xfrm_encap_tmpl *encap)
2211 {
2212         int err = -EINVAL;
2213         int ret;
2214         struct xfrm_mgr *km;
2215
2216         rcu_read_lock();
2217         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2218                 if (km->migrate) {
2219                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2220                                           encap);
2221                         if (!ret)
2222                                 err = ret;
2223                 }
2224         }
2225         rcu_read_unlock();
2226         return err;
2227 }
2228 EXPORT_SYMBOL(km_migrate);
2229 #endif
2230
2231 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2232 {
2233         int err = -EINVAL;
2234         int ret;
2235         struct xfrm_mgr *km;
2236
2237         rcu_read_lock();
2238         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2239                 if (km->report) {
2240                         ret = km->report(net, proto, sel, addr);
2241                         if (!ret)
2242                                 err = ret;
2243                 }
2244         }
2245         rcu_read_unlock();
2246         return err;
2247 }
2248 EXPORT_SYMBOL(km_report);
2249
2250 static bool km_is_alive(const struct km_event *c)
2251 {
2252         struct xfrm_mgr *km;
2253         bool is_alive = false;
2254
2255         rcu_read_lock();
2256         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2257                 if (km->is_alive && km->is_alive(c)) {
2258                         is_alive = true;
2259                         break;
2260                 }
2261         }
2262         rcu_read_unlock();
2263
2264         return is_alive;
2265 }
2266
2267 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2268 {
2269         int err;
2270         u8 *data;
2271         struct xfrm_mgr *km;
2272         struct xfrm_policy *pol = NULL;
2273
2274         if (in_compat_syscall())
2275                 return -EOPNOTSUPP;
2276
2277         if (!optval && !optlen) {
2278                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2279                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2280                 __sk_dst_reset(sk);
2281                 return 0;
2282         }
2283
2284         if (optlen <= 0 || optlen > PAGE_SIZE)
2285                 return -EMSGSIZE;
2286
2287         data = memdup_user(optval, optlen);
2288         if (IS_ERR(data))
2289                 return PTR_ERR(data);
2290
2291         err = -EINVAL;
2292         rcu_read_lock();
2293         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2294                 pol = km->compile_policy(sk, optname, data,
2295                                          optlen, &err);
2296                 if (err >= 0)
2297                         break;
2298         }
2299         rcu_read_unlock();
2300
2301         if (err >= 0) {
2302                 xfrm_sk_policy_insert(sk, err, pol);
2303                 xfrm_pol_put(pol);
2304                 __sk_dst_reset(sk);
2305                 err = 0;
2306         }
2307
2308         kfree(data);
2309         return err;
2310 }
2311 EXPORT_SYMBOL(xfrm_user_policy);
2312
2313 static DEFINE_SPINLOCK(xfrm_km_lock);
2314
2315 int xfrm_register_km(struct xfrm_mgr *km)
2316 {
2317         spin_lock_bh(&xfrm_km_lock);
2318         list_add_tail_rcu(&km->list, &xfrm_km_list);
2319         spin_unlock_bh(&xfrm_km_lock);
2320         return 0;
2321 }
2322 EXPORT_SYMBOL(xfrm_register_km);
2323
2324 int xfrm_unregister_km(struct xfrm_mgr *km)
2325 {
2326         spin_lock_bh(&xfrm_km_lock);
2327         list_del_rcu(&km->list);
2328         spin_unlock_bh(&xfrm_km_lock);
2329         synchronize_rcu();
2330         return 0;
2331 }
2332 EXPORT_SYMBOL(xfrm_unregister_km);
2333
2334 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2335 {
2336         int err = 0;
2337
2338         if (WARN_ON(afinfo->family >= NPROTO))
2339                 return -EAFNOSUPPORT;
2340
2341         spin_lock_bh(&xfrm_state_afinfo_lock);
2342         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2343                 err = -EEXIST;
2344         else
2345                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2346         spin_unlock_bh(&xfrm_state_afinfo_lock);
2347         return err;
2348 }
2349 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2350
2351 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2352 {
2353         int err = 0, family = afinfo->family;
2354
2355         if (WARN_ON(family >= NPROTO))
2356                 return -EAFNOSUPPORT;
2357
2358         spin_lock_bh(&xfrm_state_afinfo_lock);
2359         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2360                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2361                         err = -EINVAL;
2362                 else
2363                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2364         }
2365         spin_unlock_bh(&xfrm_state_afinfo_lock);
2366         synchronize_rcu();
2367         return err;
2368 }
2369 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2370
2371 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2372 {
2373         if (unlikely(family >= NPROTO))
2374                 return NULL;
2375
2376         return rcu_dereference(xfrm_state_afinfo[family]);
2377 }
2378 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2379
2380 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2381 {
2382         struct xfrm_state_afinfo *afinfo;
2383         if (unlikely(family >= NPROTO))
2384                 return NULL;
2385         rcu_read_lock();
2386         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2387         if (unlikely(!afinfo))
2388                 rcu_read_unlock();
2389         return afinfo;
2390 }
2391
2392 void xfrm_flush_gc(void)
2393 {
2394         flush_work(&xfrm_state_gc_work);
2395 }
2396 EXPORT_SYMBOL(xfrm_flush_gc);
2397
2398 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2399 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2400 {
2401         if (x->tunnel) {
2402                 struct xfrm_state *t = x->tunnel;
2403
2404                 if (atomic_read(&t->tunnel_users) == 2)
2405                         xfrm_state_delete(t);
2406                 atomic_dec(&t->tunnel_users);
2407                 xfrm_state_put_sync(t);
2408                 x->tunnel = NULL;
2409         }
2410 }
2411 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2412
2413 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2414 {
2415         const struct xfrm_type *type = READ_ONCE(x->type);
2416         struct crypto_aead *aead;
2417         u32 blksize, net_adj = 0;
2418
2419         if (x->km.state != XFRM_STATE_VALID ||
2420             !type || type->proto != IPPROTO_ESP)
2421                 return mtu - x->props.header_len;
2422
2423         aead = x->data;
2424         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2425
2426         switch (x->props.mode) {
2427         case XFRM_MODE_TRANSPORT:
2428         case XFRM_MODE_BEET:
2429                 if (x->props.family == AF_INET)
2430                         net_adj = sizeof(struct iphdr);
2431                 else if (x->props.family == AF_INET6)
2432                         net_adj = sizeof(struct ipv6hdr);
2433                 break;
2434         case XFRM_MODE_TUNNEL:
2435                 break;
2436         default:
2437                 WARN_ON_ONCE(1);
2438                 break;
2439         }
2440
2441         return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2442                  net_adj) & ~(blksize - 1)) + net_adj - 2;
2443 }
2444 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2445
2446 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2447 {
2448         const struct xfrm_mode *inner_mode;
2449         const struct xfrm_mode *outer_mode;
2450         int family = x->props.family;
2451         int err;
2452
2453         if (family == AF_INET &&
2454             xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
2455                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2456
2457         err = -EPROTONOSUPPORT;
2458
2459         if (x->sel.family != AF_UNSPEC) {
2460                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2461                 if (inner_mode == NULL)
2462                         goto error;
2463
2464                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2465                     family != x->sel.family)
2466                         goto error;
2467
2468                 x->inner_mode = *inner_mode;
2469         } else {
2470                 const struct xfrm_mode *inner_mode_iaf;
2471                 int iafamily = AF_INET;
2472
2473                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2474                 if (inner_mode == NULL)
2475                         goto error;
2476
2477                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2478                         goto error;
2479
2480                 x->inner_mode = *inner_mode;
2481
2482                 if (x->props.family == AF_INET)
2483                         iafamily = AF_INET6;
2484
2485                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2486                 if (inner_mode_iaf) {
2487                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2488                                 x->inner_mode_iaf = *inner_mode_iaf;
2489                 }
2490         }
2491
2492         x->type = xfrm_get_type(x->id.proto, family);
2493         if (x->type == NULL)
2494                 goto error;
2495
2496         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2497
2498         err = x->type->init_state(x);
2499         if (err)
2500                 goto error;
2501
2502         outer_mode = xfrm_get_mode(x->props.mode, family);
2503         if (!outer_mode) {
2504                 err = -EPROTONOSUPPORT;
2505                 goto error;
2506         }
2507
2508         x->outer_mode = *outer_mode;
2509         if (init_replay) {
2510                 err = xfrm_init_replay(x);
2511                 if (err)
2512                         goto error;
2513         }
2514
2515 error:
2516         return err;
2517 }
2518
2519 EXPORT_SYMBOL(__xfrm_init_state);
2520
2521 int xfrm_init_state(struct xfrm_state *x)
2522 {
2523         int err;
2524
2525         err = __xfrm_init_state(x, true, false);
2526         if (!err)
2527                 x->km.state = XFRM_STATE_VALID;
2528
2529         return err;
2530 }
2531
2532 EXPORT_SYMBOL(xfrm_init_state);
2533
2534 int __net_init xfrm_state_init(struct net *net)
2535 {
2536         unsigned int sz;
2537
2538         if (net_eq(net, &init_net))
2539                 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2540                                               SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2541
2542         INIT_LIST_HEAD(&net->xfrm.state_all);
2543
2544         sz = sizeof(struct hlist_head) * 8;
2545
2546         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2547         if (!net->xfrm.state_bydst)
2548                 goto out_bydst;
2549         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2550         if (!net->xfrm.state_bysrc)
2551                 goto out_bysrc;
2552         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2553         if (!net->xfrm.state_byspi)
2554                 goto out_byspi;
2555         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2556
2557         net->xfrm.state_num = 0;
2558         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2559         spin_lock_init(&net->xfrm.xfrm_state_lock);
2560         return 0;
2561
2562 out_byspi:
2563         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2564 out_bysrc:
2565         xfrm_hash_free(net->xfrm.state_bydst, sz);
2566 out_bydst:
2567         return -ENOMEM;
2568 }
2569
2570 void xfrm_state_fini(struct net *net)
2571 {
2572         unsigned int sz;
2573
2574         flush_work(&net->xfrm.state_hash_work);
2575         flush_work(&xfrm_state_gc_work);
2576         xfrm_state_flush(net, 0, false, true);
2577
2578         WARN_ON(!list_empty(&net->xfrm.state_all));
2579
2580         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2581         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2582         xfrm_hash_free(net->xfrm.state_byspi, sz);
2583         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2584         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2585         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2586         xfrm_hash_free(net->xfrm.state_bydst, sz);
2587 }
2588
2589 #ifdef CONFIG_AUDITSYSCALL
2590 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2591                                      struct audit_buffer *audit_buf)
2592 {
2593         struct xfrm_sec_ctx *ctx = x->security;
2594         u32 spi = ntohl(x->id.spi);
2595
2596         if (ctx)
2597                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2598                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2599
2600         switch (x->props.family) {
2601         case AF_INET:
2602                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2603                                  &x->props.saddr.a4, &x->id.daddr.a4);
2604                 break;
2605         case AF_INET6:
2606                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2607                                  x->props.saddr.a6, x->id.daddr.a6);
2608                 break;
2609         }
2610
2611         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2612 }
2613
2614 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2615                                       struct audit_buffer *audit_buf)
2616 {
2617         const struct iphdr *iph4;
2618         const struct ipv6hdr *iph6;
2619
2620         switch (family) {
2621         case AF_INET:
2622                 iph4 = ip_hdr(skb);
2623                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2624                                  &iph4->saddr, &iph4->daddr);
2625                 break;
2626         case AF_INET6:
2627                 iph6 = ipv6_hdr(skb);
2628                 audit_log_format(audit_buf,
2629                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2630                                  &iph6->saddr, &iph6->daddr,
2631                                  iph6->flow_lbl[0] & 0x0f,
2632                                  iph6->flow_lbl[1],
2633                                  iph6->flow_lbl[2]);
2634                 break;
2635         }
2636 }
2637
2638 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2639 {
2640         struct audit_buffer *audit_buf;
2641
2642         audit_buf = xfrm_audit_start("SAD-add");
2643         if (audit_buf == NULL)
2644                 return;
2645         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2646         xfrm_audit_helper_sainfo(x, audit_buf);
2647         audit_log_format(audit_buf, " res=%u", result);
2648         audit_log_end(audit_buf);
2649 }
2650 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2651
2652 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2653 {
2654         struct audit_buffer *audit_buf;
2655
2656         audit_buf = xfrm_audit_start("SAD-delete");
2657         if (audit_buf == NULL)
2658                 return;
2659         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2660         xfrm_audit_helper_sainfo(x, audit_buf);
2661         audit_log_format(audit_buf, " res=%u", result);
2662         audit_log_end(audit_buf);
2663 }
2664 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2665
2666 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2667                                       struct sk_buff *skb)
2668 {
2669         struct audit_buffer *audit_buf;
2670         u32 spi;
2671
2672         audit_buf = xfrm_audit_start("SA-replay-overflow");
2673         if (audit_buf == NULL)
2674                 return;
2675         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2676         /* don't record the sequence number because it's inherent in this kind
2677          * of audit message */
2678         spi = ntohl(x->id.spi);
2679         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2680         audit_log_end(audit_buf);
2681 }
2682 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2683
2684 void xfrm_audit_state_replay(struct xfrm_state *x,
2685                              struct sk_buff *skb, __be32 net_seq)
2686 {
2687         struct audit_buffer *audit_buf;
2688         u32 spi;
2689
2690         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2691         if (audit_buf == NULL)
2692                 return;
2693         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2694         spi = ntohl(x->id.spi);
2695         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2696                          spi, spi, ntohl(net_seq));
2697         audit_log_end(audit_buf);
2698 }
2699 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2700
2701 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2702 {
2703         struct audit_buffer *audit_buf;
2704
2705         audit_buf = xfrm_audit_start("SA-notfound");
2706         if (audit_buf == NULL)
2707                 return;
2708         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2709         audit_log_end(audit_buf);
2710 }
2711 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2712
2713 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2714                                __be32 net_spi, __be32 net_seq)
2715 {
2716         struct audit_buffer *audit_buf;
2717         u32 spi;
2718
2719         audit_buf = xfrm_audit_start("SA-notfound");
2720         if (audit_buf == NULL)
2721                 return;
2722         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2723         spi = ntohl(net_spi);
2724         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2725                          spi, spi, ntohl(net_seq));
2726         audit_log_end(audit_buf);
2727 }
2728 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2729
2730 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2731                               struct sk_buff *skb, u8 proto)
2732 {
2733         struct audit_buffer *audit_buf;
2734         __be32 net_spi;
2735         __be32 net_seq;
2736
2737         audit_buf = xfrm_audit_start("SA-icv-failure");
2738         if (audit_buf == NULL)
2739                 return;
2740         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2741         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2742                 u32 spi = ntohl(net_spi);
2743                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2744                                  spi, spi, ntohl(net_seq));
2745         }
2746         audit_log_end(audit_buf);
2747 }
2748 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2749 #endif /* CONFIG_AUDITSYSCALL */