net/xfrm/xfrm_state.c

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