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