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 <asm/uaccess.h>
  24
  25 #include "xfrm_hash.h"
  26
  27 /* Each xfrm_state may be linked to two tables:
  28
  29    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  30    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  31       destination/tunnel endpoint. (output)
  32  */
  33
  34 static DEFINE_SPINLOCK(xfrm_state_lock);
  35
  36 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  37 static unsigned int xfrm_state_genid;
  38
  39 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
  40 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
  41
  42 #ifdef CONFIG_AUDITSYSCALL
  43 static void xfrm_audit_state_replay(struct xfrm_state *x,
  44                                     struct sk_buff *skb, __be32 net_seq);
  45 #else
  46 #define xfrm_audit_state_replay(x, s, sq)       do { ; } while (0)
  47 #endif /* CONFIG_AUDITSYSCALL */
  48
  49 static inline unsigned int xfrm_dst_hash(struct net *net,
  50                                          xfrm_address_t *daddr,
  51                                          xfrm_address_t *saddr,
  52                                          u32 reqid,
  53                                          unsigned short family)
  54 {
  55         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  56 }
  57
  58 static inline unsigned int xfrm_src_hash(struct net *net,
  59                                          xfrm_address_t *daddr,
  60                                          xfrm_address_t *saddr,
  61                                          unsigned short family)
  62 {
  63         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  64 }
  65
  66 static inline unsigned int
  67 xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
  68 {
  69         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  70 }
  71
  72 static void xfrm_hash_transfer(struct hlist_head *list,
  73                                struct hlist_head *ndsttable,
  74                                struct hlist_head *nsrctable,
  75                                struct hlist_head *nspitable,
  76                                unsigned int nhashmask)
  77 {
  78         struct hlist_node *entry, *tmp;
  79         struct xfrm_state *x;
  80
  81         hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
  82                 unsigned int h;
  83
  84                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  85                                     x->props.reqid, x->props.family,
  86                                     nhashmask);
  87                 hlist_add_head(&x->bydst, ndsttable+h);
  88
  89                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  90                                     x->props.family,
  91                                     nhashmask);
  92                 hlist_add_head(&x->bysrc, nsrctable+h);
  93
  94                 if (x->id.spi) {
  95                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
  96                                             x->id.proto, x->props.family,
  97                                             nhashmask);
  98                         hlist_add_head(&x->byspi, nspitable+h);
  99                 }
 100         }
 101 }
 102
 103 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 104 {
 105         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 106 }
 107
 108 static DEFINE_MUTEX(hash_resize_mutex);
 109
 110 static void xfrm_hash_resize(struct work_struct *work)
 111 {
 112         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 113         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 114         unsigned long nsize, osize;
 115         unsigned int nhashmask, ohashmask;
 116         int i;
 117
 118         mutex_lock(&hash_resize_mutex);
 119
 120         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 121         ndst = xfrm_hash_alloc(nsize);
 122         if (!ndst)
 123                 goto out_unlock;
 124         nsrc = xfrm_hash_alloc(nsize);
 125         if (!nsrc) {
 126                 xfrm_hash_free(ndst, nsize);
 127                 goto out_unlock;
 128         }
 129         nspi = xfrm_hash_alloc(nsize);
 130         if (!nspi) {
 131                 xfrm_hash_free(ndst, nsize);
 132                 xfrm_hash_free(nsrc, nsize);
 133                 goto out_unlock;
 134         }
 135
 136         spin_lock_bh(&xfrm_state_lock);
 137
 138         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 139         for (i = net->xfrm.state_hmask; i >= 0; i--)
 140                 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
 141                                    nhashmask);
 142
 143         odst = net->xfrm.state_bydst;
 144         osrc = net->xfrm.state_bysrc;
 145         ospi = net->xfrm.state_byspi;
 146         ohashmask = net->xfrm.state_hmask;
 147
 148         net->xfrm.state_bydst = ndst;
 149         net->xfrm.state_bysrc = nsrc;
 150         net->xfrm.state_byspi = nspi;
 151         net->xfrm.state_hmask = nhashmask;
 152
 153         spin_unlock_bh(&xfrm_state_lock);
 154
 155         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 156         xfrm_hash_free(odst, osize);
 157         xfrm_hash_free(osrc, osize);
 158         xfrm_hash_free(ospi, osize);
 159
 160 out_unlock:
 161         mutex_unlock(&hash_resize_mutex);
 162 }
 163
 164 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
 165 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
 166
 167 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 168
 169 int __xfrm_state_delete(struct xfrm_state *x);
 170
 171 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 172 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 173
 174 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
 175 {
 176         struct xfrm_state_afinfo *afinfo;
 177         if (unlikely(family >= NPROTO))
 178                 return NULL;
 179         write_lock_bh(&xfrm_state_afinfo_lock);
 180         afinfo = xfrm_state_afinfo[family];
 181         if (unlikely(!afinfo))
 182                 write_unlock_bh(&xfrm_state_afinfo_lock);
 183         return afinfo;
 184 }
 185
 186 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
 187         __releases(xfrm_state_afinfo_lock)
 188 {
 189         write_unlock_bh(&xfrm_state_afinfo_lock);
 190 }
 191
 192 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 193 {
 194         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 195         const struct xfrm_type **typemap;
 196         int err = 0;
 197
 198         if (unlikely(afinfo == NULL))
 199                 return -EAFNOSUPPORT;
 200         typemap = afinfo->type_map;
 201
 202         if (likely(typemap[type->proto] == NULL))
 203                 typemap[type->proto] = type;
 204         else
 205                 err = -EEXIST;
 206         xfrm_state_unlock_afinfo(afinfo);
 207         return err;
 208 }
 209 EXPORT_SYMBOL(xfrm_register_type);
 210
 211 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 212 {
 213         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 214         const struct xfrm_type **typemap;
 215         int err = 0;
 216
 217         if (unlikely(afinfo == NULL))
 218                 return -EAFNOSUPPORT;
 219         typemap = afinfo->type_map;
 220
 221         if (unlikely(typemap[type->proto] != type))
 222                 err = -ENOENT;
 223         else
 224                 typemap[type->proto] = NULL;
 225         xfrm_state_unlock_afinfo(afinfo);
 226         return err;
 227 }
 228 EXPORT_SYMBOL(xfrm_unregister_type);
 229
 230 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 231 {
 232         struct xfrm_state_afinfo *afinfo;
 233         const struct xfrm_type **typemap;
 234         const struct xfrm_type *type;
 235         int modload_attempted = 0;
 236
 237 retry:
 238         afinfo = xfrm_state_get_afinfo(family);
 239         if (unlikely(afinfo == NULL))
 240                 return NULL;
 241         typemap = afinfo->type_map;
 242
 243         type = typemap[proto];
 244         if (unlikely(type && !try_module_get(type->owner)))
 245                 type = NULL;
 246         if (!type && !modload_attempted) {
 247                 xfrm_state_put_afinfo(afinfo);
 248                 request_module("xfrm-type-%d-%d", family, proto);
 249                 modload_attempted = 1;
 250                 goto retry;
 251         }
 252
 253         xfrm_state_put_afinfo(afinfo);
 254         return type;
 255 }
 256
 257 static void xfrm_put_type(const struct xfrm_type *type)
 258 {
 259         module_put(type->owner);
 260 }
 261
 262 int xfrm_register_mode(struct xfrm_mode *mode, int family)
 263 {
 264         struct xfrm_state_afinfo *afinfo;
 265         struct xfrm_mode **modemap;
 266         int err;
 267
 268         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 269                 return -EINVAL;
 270
 271         afinfo = xfrm_state_lock_afinfo(family);
 272         if (unlikely(afinfo == NULL))
 273                 return -EAFNOSUPPORT;
 274
 275         err = -EEXIST;
 276         modemap = afinfo->mode_map;
 277         if (modemap[mode->encap])
 278                 goto out;
 279
 280         err = -ENOENT;
 281         if (!try_module_get(afinfo->owner))
 282                 goto out;
 283
 284         mode->afinfo = afinfo;
 285         modemap[mode->encap] = mode;
 286         err = 0;
 287
 288 out:
 289         xfrm_state_unlock_afinfo(afinfo);
 290         return err;
 291 }
 292 EXPORT_SYMBOL(xfrm_register_mode);
 293
 294 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 295 {
 296         struct xfrm_state_afinfo *afinfo;
 297         struct xfrm_mode **modemap;
 298         int err;
 299
 300         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 301                 return -EINVAL;
 302
 303         afinfo = xfrm_state_lock_afinfo(family);
 304         if (unlikely(afinfo == NULL))
 305                 return -EAFNOSUPPORT;
 306
 307         err = -ENOENT;
 308         modemap = afinfo->mode_map;
 309         if (likely(modemap[mode->encap] == mode)) {
 310                 modemap[mode->encap] = NULL;
 311                 module_put(mode->afinfo->owner);
 312                 err = 0;
 313         }
 314
 315         xfrm_state_unlock_afinfo(afinfo);
 316         return err;
 317 }
 318 EXPORT_SYMBOL(xfrm_unregister_mode);
 319
 320 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 321 {
 322         struct xfrm_state_afinfo *afinfo;
 323         struct xfrm_mode *mode;
 324         int modload_attempted = 0;
 325
 326         if (unlikely(encap >= XFRM_MODE_MAX))
 327                 return NULL;
 328
 329 retry:
 330         afinfo = xfrm_state_get_afinfo(family);
 331         if (unlikely(afinfo == NULL))
 332                 return NULL;
 333
 334         mode = afinfo->mode_map[encap];
 335         if (unlikely(mode && !try_module_get(mode->owner)))
 336                 mode = NULL;
 337         if (!mode && !modload_attempted) {
 338                 xfrm_state_put_afinfo(afinfo);
 339                 request_module("xfrm-mode-%d-%d", family, encap);
 340                 modload_attempted = 1;
 341                 goto retry;
 342         }
 343
 344         xfrm_state_put_afinfo(afinfo);
 345         return mode;
 346 }
 347
 348 static void xfrm_put_mode(struct xfrm_mode *mode)
 349 {
 350         module_put(mode->owner);
 351 }
 352
 353 static void xfrm_state_gc_destroy(struct xfrm_state *x)
 354 {
 355         del_timer_sync(&x->timer);
 356         del_timer_sync(&x->rtimer);
 357         kfree(x->aalg);
 358         kfree(x->ealg);
 359         kfree(x->calg);
 360         kfree(x->encap);
 361         kfree(x->coaddr);
 362         if (x->inner_mode)
 363                 xfrm_put_mode(x->inner_mode);
 364         if (x->inner_mode_iaf)
 365                 xfrm_put_mode(x->inner_mode_iaf);
 366         if (x->outer_mode)
 367                 xfrm_put_mode(x->outer_mode);
 368         if (x->type) {
 369                 x->type->destructor(x);
 370                 xfrm_put_type(x->type);
 371         }
 372         security_xfrm_state_free(x);
 373         kfree(x);
 374 }
 375
 376 static void xfrm_state_gc_task(struct work_struct *work)
 377 {
 378         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
 379         struct xfrm_state *x;
 380         struct hlist_node *entry, *tmp;
 381         struct hlist_head gc_list;
 382
 383         spin_lock_bh(&xfrm_state_gc_lock);
 384         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
 385         spin_unlock_bh(&xfrm_state_gc_lock);
 386
 387         hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
 388                 xfrm_state_gc_destroy(x);
 389
 390         wake_up(&net->xfrm.km_waitq);
 391 }
 392
 393 static inline unsigned long make_jiffies(long secs)
 394 {
 395         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 396                 return MAX_SCHEDULE_TIMEOUT-1;
 397         else
 398                 return secs*HZ;
 399 }
 400
 401 static void xfrm_timer_handler(unsigned long data)
 402 {
 403         struct xfrm_state *x = (struct xfrm_state*)data;
 404         struct net *net = xs_net(x);
 405         unsigned long now = get_seconds();
 406         long next = LONG_MAX;
 407         int warn = 0;
 408         int err = 0;
 409
 410         spin_lock(&x->lock);
 411         if (x->km.state == XFRM_STATE_DEAD)
 412                 goto out;
 413         if (x->km.state == XFRM_STATE_EXPIRED)
 414                 goto expired;
 415         if (x->lft.hard_add_expires_seconds) {
 416                 long tmo = x->lft.hard_add_expires_seconds +
 417                         x->curlft.add_time - now;
 418                 if (tmo <= 0)
 419                         goto expired;
 420                 if (tmo < next)
 421                         next = tmo;
 422         }
 423         if (x->lft.hard_use_expires_seconds) {
 424                 long tmo = x->lft.hard_use_expires_seconds +
 425                         (x->curlft.use_time ? : now) - now;
 426                 if (tmo <= 0)
 427                         goto expired;
 428                 if (tmo < next)
 429                         next = tmo;
 430         }
 431         if (x->km.dying)
 432                 goto resched;
 433         if (x->lft.soft_add_expires_seconds) {
 434                 long tmo = x->lft.soft_add_expires_seconds +
 435                         x->curlft.add_time - now;
 436                 if (tmo <= 0)
 437                         warn = 1;
 438                 else if (tmo < next)
 439                         next = tmo;
 440         }
 441         if (x->lft.soft_use_expires_seconds) {
 442                 long tmo = x->lft.soft_use_expires_seconds +
 443                         (x->curlft.use_time ? : now) - now;
 444                 if (tmo <= 0)
 445                         warn = 1;
 446                 else if (tmo < next)
 447                         next = tmo;
 448         }
 449
 450         x->km.dying = warn;
 451         if (warn)
 452                 km_state_expired(x, 0, 0);
 453 resched:
 454         if (next != LONG_MAX)
 455                 mod_timer(&x->timer, jiffies + make_jiffies(next));
 456
 457         goto out;
 458
 459 expired:
 460         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
 461                 x->km.state = XFRM_STATE_EXPIRED;
 462                 wake_up(&net->xfrm.km_waitq);
 463                 next = 2;
 464                 goto resched;
 465         }
 466
 467         err = __xfrm_state_delete(x);
 468         if (!err && x->id.spi)
 469                 km_state_expired(x, 1, 0);
 470
 471         xfrm_audit_state_delete(x, err ? 0 : 1,
 472                                 audit_get_loginuid(current),
 473                                 audit_get_sessionid(current), 0);
 474
 475 out:
 476         spin_unlock(&x->lock);
 477 }
 478
 479 static void xfrm_replay_timer_handler(unsigned long data);
 480
 481 struct xfrm_state *xfrm_state_alloc(struct net *net)
 482 {
 483         struct xfrm_state *x;
 484
 485         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 486
 487         if (x) {
 488                 write_pnet(&x->xs_net, net);
 489                 atomic_set(&x->refcnt, 1);
 490                 atomic_set(&x->tunnel_users, 0);
 491                 INIT_LIST_HEAD(&x->km.all);
 492                 INIT_HLIST_NODE(&x->bydst);
 493                 INIT_HLIST_NODE(&x->bysrc);
 494                 INIT_HLIST_NODE(&x->byspi);
 495                 setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x);
 496                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 497                                 (unsigned long)x);
 498                 x->curlft.add_time = get_seconds();
 499                 x->lft.soft_byte_limit = XFRM_INF;
 500                 x->lft.soft_packet_limit = XFRM_INF;
 501                 x->lft.hard_byte_limit = XFRM_INF;
 502                 x->lft.hard_packet_limit = XFRM_INF;
 503                 x->replay_maxage = 0;
 504                 x->replay_maxdiff = 0;
 505                 x->inner_mode = NULL;
 506                 x->inner_mode_iaf = NULL;
 507                 spin_lock_init(&x->lock);
 508         }
 509         return x;
 510 }
 511 EXPORT_SYMBOL(xfrm_state_alloc);
 512
 513 void __xfrm_state_destroy(struct xfrm_state *x)
 514 {
 515         struct net *net = xs_net(x);
 516
 517         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 518
 519         spin_lock_bh(&xfrm_state_gc_lock);
 520         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
 521         spin_unlock_bh(&xfrm_state_gc_lock);
 522         schedule_work(&net->xfrm.state_gc_work);
 523 }
 524 EXPORT_SYMBOL(__xfrm_state_destroy);
 525
 526 int __xfrm_state_delete(struct xfrm_state *x)
 527 {
 528         struct net *net = xs_net(x);
 529         int err = -ESRCH;
 530
 531         if (x->km.state != XFRM_STATE_DEAD) {
 532                 x->km.state = XFRM_STATE_DEAD;
 533                 spin_lock(&xfrm_state_lock);
 534                 list_del(&x->km.all);
 535                 hlist_del(&x->bydst);
 536                 hlist_del(&x->bysrc);
 537                 if (x->id.spi)
 538                         hlist_del(&x->byspi);
 539                 net->xfrm.state_num--;
 540                 spin_unlock(&xfrm_state_lock);
 541
 542                 /* All xfrm_state objects are created by xfrm_state_alloc.
 543                  * The xfrm_state_alloc call gives a reference, and that
 544                  * is what we are dropping here.
 545                  */
 546                 xfrm_state_put(x);
 547                 err = 0;
 548         }
 549
 550         return err;
 551 }
 552 EXPORT_SYMBOL(__xfrm_state_delete);
 553
 554 int xfrm_state_delete(struct xfrm_state *x)
 555 {
 556         int err;
 557
 558         spin_lock_bh(&x->lock);
 559         err = __xfrm_state_delete(x);
 560         spin_unlock_bh(&x->lock);
 561
 562         return err;
 563 }
 564 EXPORT_SYMBOL(xfrm_state_delete);
 565
 566 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 567 static inline int
 568 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 569 {
 570         int i, err = 0;
 571
 572         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 573                 struct hlist_node *entry;
 574                 struct xfrm_state *x;
 575
 576                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 577                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 578                            (err = security_xfrm_state_delete(x)) != 0) {
 579                                 xfrm_audit_state_delete(x, 0,
 580                                                         audit_info->loginuid,
 581                                                         audit_info->sessionid,
 582                                                         audit_info->secid);
 583                                 return err;
 584                         }
 585                 }
 586         }
 587
 588         return err;
 589 }
 590 #else
 591 static inline int
 592 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 593 {
 594         return 0;
 595 }
 596 #endif
 597
 598 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 599 {
 600         int i, err = 0;
 601
 602         spin_lock_bh(&xfrm_state_lock);
 603         err = xfrm_state_flush_secctx_check(net, proto, audit_info);
 604         if (err)
 605                 goto out;
 606
 607         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 608                 struct hlist_node *entry;
 609                 struct xfrm_state *x;
 610 restart:
 611                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 612                         if (!xfrm_state_kern(x) &&
 613                             xfrm_id_proto_match(x->id.proto, proto)) {
 614                                 xfrm_state_hold(x);
 615                                 spin_unlock_bh(&xfrm_state_lock);
 616
 617                                 err = xfrm_state_delete(x);
 618                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 619                                                         audit_info->loginuid,
 620                                                         audit_info->sessionid,
 621                                                         audit_info->secid);
 622                                 xfrm_state_put(x);
 623
 624                                 spin_lock_bh(&xfrm_state_lock);
 625                                 goto restart;
 626                         }
 627                 }
 628         }
 629         err = 0;
 630
 631 out:
 632         spin_unlock_bh(&xfrm_state_lock);
 633         wake_up(&net->xfrm.km_waitq);
 634         return err;
 635 }
 636 EXPORT_SYMBOL(xfrm_state_flush);
 637
 638 void xfrm_sad_getinfo(struct xfrmk_sadinfo *si)
 639 {
 640         spin_lock_bh(&xfrm_state_lock);
 641         si->sadcnt = init_net.xfrm.state_num;
 642         si->sadhcnt = init_net.xfrm.state_hmask;
 643         si->sadhmcnt = xfrm_state_hashmax;
 644         spin_unlock_bh(&xfrm_state_lock);
 645 }
 646 EXPORT_SYMBOL(xfrm_sad_getinfo);
 647
 648 static int
 649 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
 650                   struct xfrm_tmpl *tmpl,
 651                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 652                   unsigned short family)
 653 {
 654         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 655         if (!afinfo)
 656                 return -1;
 657         afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
 658         xfrm_state_put_afinfo(afinfo);
 659         return 0;
 660 }
 661
 662 static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
 663 {
 664         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 665         struct xfrm_state *x;
 666         struct hlist_node *entry;
 667
 668         hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
 669                 if (x->props.family != family ||
 670                     x->id.spi       != spi ||
 671                     x->id.proto     != proto ||
 672                     xfrm_addr_cmp(&x->id.daddr, daddr, family))
 673                         continue;
 674
 675                 xfrm_state_hold(x);
 676                 return x;
 677         }
 678
 679         return NULL;
 680 }
 681
 682 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
 683 {
 684         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 685         struct xfrm_state *x;
 686         struct hlist_node *entry;
 687
 688         hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
 689                 if (x->props.family != family ||
 690                     x->id.proto     != proto ||
 691                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 692                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 693                         continue;
 694
 695                 xfrm_state_hold(x);
 696                 return x;
 697         }
 698
 699         return NULL;
 700 }
 701
 702 static inline struct xfrm_state *
 703 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 704 {
 705         struct net *net = xs_net(x);
 706
 707         if (use_spi)
 708                 return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi,
 709                                            x->id.proto, family);
 710         else
 711                 return __xfrm_state_lookup_byaddr(net, &x->id.daddr,
 712                                                   &x->props.saddr,
 713                                                   x->id.proto, family);
 714 }
 715
 716 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 717 {
 718         if (have_hash_collision &&
 719             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 720             net->xfrm.state_num > net->xfrm.state_hmask)
 721                 schedule_work(&net->xfrm.state_hash_work);
 722 }
 723
 724 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 725                                struct flowi *fl, unsigned short family,
 726                                xfrm_address_t *daddr, xfrm_address_t *saddr,
 727                                struct xfrm_state **best, int *acq_in_progress,
 728                                int *error)
 729 {
 730         /* Resolution logic:
 731          * 1. There is a valid state with matching selector. Done.
 732          * 2. Valid state with inappropriate selector. Skip.
 733          *
 734          * Entering area of "sysdeps".
 735          *
 736          * 3. If state is not valid, selector is temporary, it selects
 737          *    only session which triggered previous resolution. Key
 738          *    manager will do something to install a state with proper
 739          *    selector.
 740          */
 741         if (x->km.state == XFRM_STATE_VALID) {
 742                 if ((x->sel.family &&
 743                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 744                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 745                         return;
 746
 747                 if (!*best ||
 748                     (*best)->km.dying > x->km.dying ||
 749                     ((*best)->km.dying == x->km.dying &&
 750                      (*best)->curlft.add_time < x->curlft.add_time))
 751                         *best = x;
 752         } else if (x->km.state == XFRM_STATE_ACQ) {
 753                 *acq_in_progress = 1;
 754         } else if (x->km.state == XFRM_STATE_ERROR ||
 755                    x->km.state == XFRM_STATE_EXPIRED) {
 756                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 757                     security_xfrm_state_pol_flow_match(x, pol, fl))
 758                         *error = -ESRCH;
 759         }
 760 }
 761
 762 struct xfrm_state *
 763 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 764                 struct flowi *fl, struct xfrm_tmpl *tmpl,
 765                 struct xfrm_policy *pol, int *err,
 766                 unsigned short family)
 767 {
 768         static xfrm_address_t saddr_wildcard = { };
 769         struct net *net = xp_net(pol);
 770         unsigned int h, h_wildcard;
 771         struct hlist_node *entry;
 772         struct xfrm_state *x, *x0, *to_put;
 773         int acquire_in_progress = 0;
 774         int error = 0;
 775         struct xfrm_state *best = NULL;
 776
 777         to_put = NULL;
 778
 779         spin_lock_bh(&xfrm_state_lock);
 780         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
 781         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 782                 if (x->props.family == family &&
 783                     x->props.reqid == tmpl->reqid &&
 784                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 785                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 786                     tmpl->mode == x->props.mode &&
 787                     tmpl->id.proto == x->id.proto &&
 788                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 789                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 790                                            &best, &acquire_in_progress, &error);
 791         }
 792         if (best)
 793                 goto found;
 794
 795         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
 796         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
 797                 if (x->props.family == family &&
 798                     x->props.reqid == tmpl->reqid &&
 799                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 800                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 801                     tmpl->mode == x->props.mode &&
 802                     tmpl->id.proto == x->id.proto &&
 803                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 804                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 805                                            &best, &acquire_in_progress, &error);
 806         }
 807
 808 found:
 809         x = best;
 810         if (!x && !error && !acquire_in_progress) {
 811                 if (tmpl->id.spi &&
 812                     (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi,
 813                                               tmpl->id.proto, family)) != NULL) {
 814                         to_put = x0;
 815                         error = -EEXIST;
 816                         goto out;
 817                 }
 818                 x = xfrm_state_alloc(net);
 819                 if (x == NULL) {
 820                         error = -ENOMEM;
 821                         goto out;
 822                 }
 823                 /* Initialize temporary selector matching only
 824                  * to current session. */
 825                 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
 826
 827                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
 828                 if (error) {
 829                         x->km.state = XFRM_STATE_DEAD;
 830                         to_put = x;
 831                         x = NULL;
 832                         goto out;
 833                 }
 834
 835                 if (km_query(x, tmpl, pol) == 0) {
 836                         x->km.state = XFRM_STATE_ACQ;
 837                         list_add(&x->km.all, &net->xfrm.state_all);
 838                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 839                         h = xfrm_src_hash(net, daddr, saddr, family);
 840                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 841                         if (x->id.spi) {
 842                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
 843                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 844                         }
 845                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 846                         x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
 847                         add_timer(&x->timer);
 848                         net->xfrm.state_num++;
 849                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 850                 } else {
 851                         x->km.state = XFRM_STATE_DEAD;
 852                         to_put = x;
 853                         x = NULL;
 854                         error = -ESRCH;
 855                 }
 856         }
 857 out:
 858         if (x)
 859                 xfrm_state_hold(x);
 860         else
 861                 *err = acquire_in_progress ? -EAGAIN : error;
 862         spin_unlock_bh(&xfrm_state_lock);
 863         if (to_put)
 864                 xfrm_state_put(to_put);
 865         return x;
 866 }
 867
 868 struct xfrm_state *
 869 xfrm_stateonly_find(struct net *net,
 870                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 871                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 872 {
 873         unsigned int h;
 874         struct xfrm_state *rx = NULL, *x = NULL;
 875         struct hlist_node *entry;
 876
 877         spin_lock(&xfrm_state_lock);
 878         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 879         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 880                 if (x->props.family == family &&
 881                     x->props.reqid == reqid &&
 882                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 883                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 884                     mode == x->props.mode &&
 885                     proto == x->id.proto &&
 886                     x->km.state == XFRM_STATE_VALID) {
 887                         rx = x;
 888                         break;
 889                 }
 890         }
 891
 892         if (rx)
 893                 xfrm_state_hold(rx);
 894         spin_unlock(&xfrm_state_lock);
 895
 896
 897         return rx;
 898 }
 899 EXPORT_SYMBOL(xfrm_stateonly_find);
 900
 901 static void __xfrm_state_insert(struct xfrm_state *x)
 902 {
 903         struct net *net = xs_net(x);
 904         unsigned int h;
 905
 906         x->genid = ++xfrm_state_genid;
 907
 908         list_add(&x->km.all, &net->xfrm.state_all);
 909
 910         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 911                           x->props.reqid, x->props.family);
 912         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 913
 914         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 915         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 916
 917         if (x->id.spi) {
 918                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 919                                   x->props.family);
 920
 921                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 922         }
 923
 924         mod_timer(&x->timer, jiffies + HZ);
 925         if (x->replay_maxage)
 926                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 927
 928         wake_up(&net->xfrm.km_waitq);
 929
 930         net->xfrm.state_num++;
 931
 932         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 933 }
 934
 935 /* xfrm_state_lock is held */
 936 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 937 {
 938         struct net *net = xs_net(xnew);
 939         unsigned short family = xnew->props.family;
 940         u32 reqid = xnew->props.reqid;
 941         struct xfrm_state *x;
 942         struct hlist_node *entry;
 943         unsigned int h;
 944
 945         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 946         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 947                 if (x->props.family     == family &&
 948                     x->props.reqid      == reqid &&
 949                     !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
 950                     !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
 951                         x->genid = xfrm_state_genid;
 952         }
 953 }
 954
 955 void xfrm_state_insert(struct xfrm_state *x)
 956 {
 957         spin_lock_bh(&xfrm_state_lock);
 958         __xfrm_state_bump_genids(x);
 959         __xfrm_state_insert(x);
 960         spin_unlock_bh(&xfrm_state_lock);
 961 }
 962 EXPORT_SYMBOL(xfrm_state_insert);
 963
 964 /* xfrm_state_lock is held */
 965 static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
 966 {
 967         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 968         struct hlist_node *entry;
 969         struct xfrm_state *x;
 970
 971         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 972                 if (x->props.reqid  != reqid ||
 973                     x->props.mode   != mode ||
 974                     x->props.family != family ||
 975                     x->km.state     != XFRM_STATE_ACQ ||
 976                     x->id.spi       != 0 ||
 977                     x->id.proto     != proto ||
 978                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 979                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 980                         continue;
 981
 982                 xfrm_state_hold(x);
 983                 return x;
 984         }
 985
 986         if (!create)
 987                 return NULL;
 988
 989         x = xfrm_state_alloc(net);
 990         if (likely(x)) {
 991                 switch (family) {
 992                 case AF_INET:
 993                         x->sel.daddr.a4 = daddr->a4;
 994                         x->sel.saddr.a4 = saddr->a4;
 995                         x->sel.prefixlen_d = 32;
 996                         x->sel.prefixlen_s = 32;
 997                         x->props.saddr.a4 = saddr->a4;
 998                         x->id.daddr.a4 = daddr->a4;
 999                         break;
1000
1001                 case AF_INET6:
1002                         ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1003                                        (struct in6_addr *)daddr);
1004                         ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1005                                        (struct in6_addr *)saddr);
1006                         x->sel.prefixlen_d = 128;
1007                         x->sel.prefixlen_s = 128;
1008                         ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1009                                        (struct in6_addr *)saddr);
1010                         ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1011                                        (struct in6_addr *)daddr);
1012                         break;
1013                 }
1014
1015                 x->km.state = XFRM_STATE_ACQ;
1016                 x->id.proto = proto;
1017                 x->props.family = family;
1018                 x->props.mode = mode;
1019                 x->props.reqid = reqid;
1020                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1021                 xfrm_state_hold(x);
1022                 x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
1023                 add_timer(&x->timer);
1024                 list_add(&x->km.all, &net->xfrm.state_all);
1025                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1026                 h = xfrm_src_hash(net, daddr, saddr, family);
1027                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1028
1029                 net->xfrm.state_num++;
1030
1031                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1032         }
1033
1034         return x;
1035 }
1036
1037 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq);
1038
1039 int xfrm_state_add(struct xfrm_state *x)
1040 {
1041         struct net *net = xs_net(x);
1042         struct xfrm_state *x1, *to_put;
1043         int family;
1044         int err;
1045         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1046
1047         family = x->props.family;
1048
1049         to_put = NULL;
1050
1051         spin_lock_bh(&xfrm_state_lock);
1052
1053         x1 = __xfrm_state_locate(x, use_spi, family);
1054         if (x1) {
1055                 to_put = x1;
1056                 x1 = NULL;
1057                 err = -EEXIST;
1058                 goto out;
1059         }
1060
1061         if (use_spi && x->km.seq) {
1062                 x1 = __xfrm_find_acq_byseq(net, x->km.seq);
1063                 if (x1 && ((x1->id.proto != x->id.proto) ||
1064                     xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1065                         to_put = x1;
1066                         x1 = NULL;
1067                 }
1068         }
1069
1070         if (use_spi && !x1)
1071                 x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid,
1072                                      x->id.proto,
1073                                      &x->id.daddr, &x->props.saddr, 0);
1074
1075         __xfrm_state_bump_genids(x);
1076         __xfrm_state_insert(x);
1077         err = 0;
1078
1079 out:
1080         spin_unlock_bh(&xfrm_state_lock);
1081
1082         if (x1) {
1083                 xfrm_state_delete(x1);
1084                 xfrm_state_put(x1);
1085         }
1086
1087         if (to_put)
1088                 xfrm_state_put(to_put);
1089
1090         return err;
1091 }
1092 EXPORT_SYMBOL(xfrm_state_add);
1093
1094 #ifdef CONFIG_XFRM_MIGRATE
1095 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1096 {
1097         struct net *net = xs_net(orig);
1098         int err = -ENOMEM;
1099         struct xfrm_state *x = xfrm_state_alloc(net);
1100         if (!x)
1101                 goto error;
1102
1103         memcpy(&x->id, &orig->id, sizeof(x->id));
1104         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1105         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1106         x->props.mode = orig->props.mode;
1107         x->props.replay_window = orig->props.replay_window;
1108         x->props.reqid = orig->props.reqid;
1109         x->props.family = orig->props.family;
1110         x->props.saddr = orig->props.saddr;
1111
1112         if (orig->aalg) {
1113                 x->aalg = xfrm_algo_clone(orig->aalg);
1114                 if (!x->aalg)
1115                         goto error;
1116         }
1117         x->props.aalgo = orig->props.aalgo;
1118
1119         if (orig->ealg) {
1120                 x->ealg = xfrm_algo_clone(orig->ealg);
1121                 if (!x->ealg)
1122                         goto error;
1123         }
1124         x->props.ealgo = orig->props.ealgo;
1125
1126         if (orig->calg) {
1127                 x->calg = xfrm_algo_clone(orig->calg);
1128                 if (!x->calg)
1129                         goto error;
1130         }
1131         x->props.calgo = orig->props.calgo;
1132
1133         if (orig->encap) {
1134                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1135                 if (!x->encap)
1136                         goto error;
1137         }
1138
1139         if (orig->coaddr) {
1140                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1141                                     GFP_KERNEL);
1142                 if (!x->coaddr)
1143                         goto error;
1144         }
1145
1146         err = xfrm_init_state(x);
1147         if (err)
1148                 goto error;
1149
1150         x->props.flags = orig->props.flags;
1151
1152         x->curlft.add_time = orig->curlft.add_time;
1153         x->km.state = orig->km.state;
1154         x->km.seq = orig->km.seq;
1155
1156         return x;
1157
1158  error:
1159         if (errp)
1160                 *errp = err;
1161         if (x) {
1162                 kfree(x->aalg);
1163                 kfree(x->ealg);
1164                 kfree(x->calg);
1165                 kfree(x->encap);
1166                 kfree(x->coaddr);
1167         }
1168         kfree(x);
1169         return NULL;
1170 }
1171
1172 /* xfrm_state_lock is held */
1173 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1174 {
1175         unsigned int h;
1176         struct xfrm_state *x;
1177         struct hlist_node *entry;
1178
1179         if (m->reqid) {
1180                 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1181                                   m->reqid, m->old_family);
1182                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1183                         if (x->props.mode != m->mode ||
1184                             x->id.proto != m->proto)
1185                                 continue;
1186                         if (m->reqid && x->props.reqid != m->reqid)
1187                                 continue;
1188                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1189                                           m->old_family) ||
1190                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1191                                           m->old_family))
1192                                 continue;
1193                         xfrm_state_hold(x);
1194                         return x;
1195                 }
1196         } else {
1197                 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1198                                   m->old_family);
1199                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1200                         if (x->props.mode != m->mode ||
1201                             x->id.proto != m->proto)
1202                                 continue;
1203                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1204                                           m->old_family) ||
1205                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1206                                           m->old_family))
1207                                 continue;
1208                         xfrm_state_hold(x);
1209                         return x;
1210                 }
1211         }
1212
1213         return NULL;
1214 }
1215 EXPORT_SYMBOL(xfrm_migrate_state_find);
1216
1217 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1218                                        struct xfrm_migrate *m)
1219 {
1220         struct xfrm_state *xc;
1221         int err;
1222
1223         xc = xfrm_state_clone(x, &err);
1224         if (!xc)
1225                 return NULL;
1226
1227         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1228         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1229
1230         /* add state */
1231         if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1232                 /* a care is needed when the destination address of the
1233                    state is to be updated as it is a part of triplet */
1234                 xfrm_state_insert(xc);
1235         } else {
1236                 if ((err = xfrm_state_add(xc)) < 0)
1237                         goto error;
1238         }
1239
1240         return xc;
1241 error:
1242         kfree(xc);
1243         return NULL;
1244 }
1245 EXPORT_SYMBOL(xfrm_state_migrate);
1246 #endif
1247
1248 int xfrm_state_update(struct xfrm_state *x)
1249 {
1250         struct xfrm_state *x1, *to_put;
1251         int err;
1252         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1253
1254         to_put = NULL;
1255
1256         spin_lock_bh(&xfrm_state_lock);
1257         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1258
1259         err = -ESRCH;
1260         if (!x1)
1261                 goto out;
1262
1263         if (xfrm_state_kern(x1)) {
1264                 to_put = x1;
1265                 err = -EEXIST;
1266                 goto out;
1267         }
1268
1269         if (x1->km.state == XFRM_STATE_ACQ) {
1270                 __xfrm_state_insert(x);
1271                 x = NULL;
1272         }
1273         err = 0;
1274
1275 out:
1276         spin_unlock_bh(&xfrm_state_lock);
1277
1278         if (to_put)
1279                 xfrm_state_put(to_put);
1280
1281         if (err)
1282                 return err;
1283
1284         if (!x) {
1285                 xfrm_state_delete(x1);
1286                 xfrm_state_put(x1);
1287                 return 0;
1288         }
1289
1290         err = -EINVAL;
1291         spin_lock_bh(&x1->lock);
1292         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1293                 if (x->encap && x1->encap)
1294                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1295                 if (x->coaddr && x1->coaddr) {
1296                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1297                 }
1298                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1299                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1300                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1301                 x1->km.dying = 0;
1302
1303                 mod_timer(&x1->timer, jiffies + HZ);
1304                 if (x1->curlft.use_time)
1305                         xfrm_state_check_expire(x1);
1306
1307                 err = 0;
1308         }
1309         spin_unlock_bh(&x1->lock);
1310
1311         xfrm_state_put(x1);
1312
1313         return err;
1314 }
1315 EXPORT_SYMBOL(xfrm_state_update);
1316
1317 int xfrm_state_check_expire(struct xfrm_state *x)
1318 {
1319         if (!x->curlft.use_time)
1320                 x->curlft.use_time = get_seconds();
1321
1322         if (x->km.state != XFRM_STATE_VALID)
1323                 return -EINVAL;
1324
1325         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1326             x->curlft.packets >= x->lft.hard_packet_limit) {
1327                 x->km.state = XFRM_STATE_EXPIRED;
1328                 mod_timer(&x->timer, jiffies);
1329                 return -EINVAL;
1330         }
1331
1332         if (!x->km.dying &&
1333             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1334              x->curlft.packets >= x->lft.soft_packet_limit)) {
1335                 x->km.dying = 1;
1336                 km_state_expired(x, 0, 0);
1337         }
1338         return 0;
1339 }
1340 EXPORT_SYMBOL(xfrm_state_check_expire);
1341
1342 struct xfrm_state *
1343 xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto,
1344                   unsigned short family)
1345 {
1346         struct xfrm_state *x;
1347
1348         spin_lock_bh(&xfrm_state_lock);
1349         x = __xfrm_state_lookup(net, daddr, spi, proto, family);
1350         spin_unlock_bh(&xfrm_state_lock);
1351         return x;
1352 }
1353 EXPORT_SYMBOL(xfrm_state_lookup);
1354
1355 struct xfrm_state *
1356 xfrm_state_lookup_byaddr(struct net *net,
1357                          xfrm_address_t *daddr, xfrm_address_t *saddr,
1358                          u8 proto, unsigned short family)
1359 {
1360         struct xfrm_state *x;
1361
1362         spin_lock_bh(&xfrm_state_lock);
1363         x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family);
1364         spin_unlock_bh(&xfrm_state_lock);
1365         return x;
1366 }
1367 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1368
1369 struct xfrm_state *
1370 xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1371               xfrm_address_t *daddr, xfrm_address_t *saddr,
1372               int create, unsigned short family)
1373 {
1374         struct xfrm_state *x;
1375
1376         spin_lock_bh(&xfrm_state_lock);
1377         x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create);
1378         spin_unlock_bh(&xfrm_state_lock);
1379
1380         return x;
1381 }
1382 EXPORT_SYMBOL(xfrm_find_acq);
1383
1384 #ifdef CONFIG_XFRM_SUB_POLICY
1385 int
1386 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1387                unsigned short family)
1388 {
1389         int err = 0;
1390         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1391         if (!afinfo)
1392                 return -EAFNOSUPPORT;
1393
1394         spin_lock_bh(&xfrm_state_lock);
1395         if (afinfo->tmpl_sort)
1396                 err = afinfo->tmpl_sort(dst, src, n);
1397         spin_unlock_bh(&xfrm_state_lock);
1398         xfrm_state_put_afinfo(afinfo);
1399         return err;
1400 }
1401 EXPORT_SYMBOL(xfrm_tmpl_sort);
1402
1403 int
1404 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1405                 unsigned short family)
1406 {
1407         int err = 0;
1408         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1409         if (!afinfo)
1410                 return -EAFNOSUPPORT;
1411
1412         spin_lock_bh(&xfrm_state_lock);
1413         if (afinfo->state_sort)
1414                 err = afinfo->state_sort(dst, src, n);
1415         spin_unlock_bh(&xfrm_state_lock);
1416         xfrm_state_put_afinfo(afinfo);
1417         return err;
1418 }
1419 EXPORT_SYMBOL(xfrm_state_sort);
1420 #endif
1421
1422 /* Silly enough, but I'm lazy to build resolution list */
1423
1424 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq)
1425 {
1426         int i;
1427
1428         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1429                 struct hlist_node *entry;
1430                 struct xfrm_state *x;
1431
1432                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1433                         if (x->km.seq == seq &&
1434                             x->km.state == XFRM_STATE_ACQ) {
1435                                 xfrm_state_hold(x);
1436                                 return x;
1437                         }
1438                 }
1439         }
1440         return NULL;
1441 }
1442
1443 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq)
1444 {
1445         struct xfrm_state *x;
1446
1447         spin_lock_bh(&xfrm_state_lock);
1448         x = __xfrm_find_acq_byseq(net, seq);
1449         spin_unlock_bh(&xfrm_state_lock);
1450         return x;
1451 }
1452 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1453
1454 u32 xfrm_get_acqseq(void)
1455 {
1456         u32 res;
1457         static u32 acqseq;
1458         static DEFINE_SPINLOCK(acqseq_lock);
1459
1460         spin_lock_bh(&acqseq_lock);
1461         res = (++acqseq ? : ++acqseq);
1462         spin_unlock_bh(&acqseq_lock);
1463         return res;
1464 }
1465 EXPORT_SYMBOL(xfrm_get_acqseq);
1466
1467 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1468 {
1469         struct net *net = xs_net(x);
1470         unsigned int h;
1471         struct xfrm_state *x0;
1472         int err = -ENOENT;
1473         __be32 minspi = htonl(low);
1474         __be32 maxspi = htonl(high);
1475
1476         spin_lock_bh(&x->lock);
1477         if (x->km.state == XFRM_STATE_DEAD)
1478                 goto unlock;
1479
1480         err = 0;
1481         if (x->id.spi)
1482                 goto unlock;
1483
1484         err = -ENOENT;
1485
1486         if (minspi == maxspi) {
1487                 x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family);
1488                 if (x0) {
1489                         xfrm_state_put(x0);
1490                         goto unlock;
1491                 }
1492                 x->id.spi = minspi;
1493         } else {
1494                 u32 spi = 0;
1495                 for (h=0; h<high-low+1; h++) {
1496                         spi = low + net_random()%(high-low+1);
1497                         x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1498                         if (x0 == NULL) {
1499                                 x->id.spi = htonl(spi);
1500                                 break;
1501                         }
1502                         xfrm_state_put(x0);
1503                 }
1504         }
1505         if (x->id.spi) {
1506                 spin_lock_bh(&xfrm_state_lock);
1507                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1508                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1509                 spin_unlock_bh(&xfrm_state_lock);
1510
1511                 err = 0;
1512         }
1513
1514 unlock:
1515         spin_unlock_bh(&x->lock);
1516
1517         return err;
1518 }
1519 EXPORT_SYMBOL(xfrm_alloc_spi);
1520
1521 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1522                     int (*func)(struct xfrm_state *, int, void*),
1523                     void *data)
1524 {
1525         struct xfrm_state *state;
1526         struct xfrm_state_walk *x;
1527         int err = 0;
1528
1529         if (walk->seq != 0 && list_empty(&walk->all))
1530                 return 0;
1531
1532         spin_lock_bh(&xfrm_state_lock);
1533         if (list_empty(&walk->all))
1534                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1535         else
1536                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1537         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1538                 if (x->state == XFRM_STATE_DEAD)
1539                         continue;
1540                 state = container_of(x, struct xfrm_state, km);
1541                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1542                         continue;
1543                 err = func(state, walk->seq, data);
1544                 if (err) {
1545                         list_move_tail(&walk->all, &x->all);
1546                         goto out;
1547                 }
1548                 walk->seq++;
1549         }
1550         if (walk->seq == 0) {
1551                 err = -ENOENT;
1552                 goto out;
1553         }
1554         list_del_init(&walk->all);
1555 out:
1556         spin_unlock_bh(&xfrm_state_lock);
1557         return err;
1558 }
1559 EXPORT_SYMBOL(xfrm_state_walk);
1560
1561 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1562 {
1563         INIT_LIST_HEAD(&walk->all);
1564         walk->proto = proto;
1565         walk->state = XFRM_STATE_DEAD;
1566         walk->seq = 0;
1567 }
1568 EXPORT_SYMBOL(xfrm_state_walk_init);
1569
1570 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1571 {
1572         if (list_empty(&walk->all))
1573                 return;
1574
1575         spin_lock_bh(&xfrm_state_lock);
1576         list_del(&walk->all);
1577         spin_unlock_bh(&xfrm_state_lock);
1578 }
1579 EXPORT_SYMBOL(xfrm_state_walk_done);
1580
1581
1582 void xfrm_replay_notify(struct xfrm_state *x, int event)
1583 {
1584         struct km_event c;
1585         /* we send notify messages in case
1586          *  1. we updated on of the sequence numbers, and the seqno difference
1587          *     is at least x->replay_maxdiff, in this case we also update the
1588          *     timeout of our timer function
1589          *  2. if x->replay_maxage has elapsed since last update,
1590          *     and there were changes
1591          *
1592          *  The state structure must be locked!
1593          */
1594
1595         switch (event) {
1596         case XFRM_REPLAY_UPDATE:
1597                 if (x->replay_maxdiff &&
1598                     (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1599                     (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1600                         if (x->xflags & XFRM_TIME_DEFER)
1601                                 event = XFRM_REPLAY_TIMEOUT;
1602                         else
1603                                 return;
1604                 }
1605
1606                 break;
1607
1608         case XFRM_REPLAY_TIMEOUT:
1609                 if ((x->replay.seq == x->preplay.seq) &&
1610                     (x->replay.bitmap == x->preplay.bitmap) &&
1611                     (x->replay.oseq == x->preplay.oseq)) {
1612                         x->xflags |= XFRM_TIME_DEFER;
1613                         return;
1614                 }
1615
1616                 break;
1617         }
1618
1619         memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1620         c.event = XFRM_MSG_NEWAE;
1621         c.data.aevent = event;
1622         km_state_notify(x, &c);
1623
1624         if (x->replay_maxage &&
1625             !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1626                 x->xflags &= ~XFRM_TIME_DEFER;
1627 }
1628
1629 static void xfrm_replay_timer_handler(unsigned long data)
1630 {
1631         struct xfrm_state *x = (struct xfrm_state*)data;
1632
1633         spin_lock(&x->lock);
1634
1635         if (x->km.state == XFRM_STATE_VALID) {
1636                 if (xfrm_aevent_is_on(xs_net(x)))
1637                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1638                 else
1639                         x->xflags |= XFRM_TIME_DEFER;
1640         }
1641
1642         spin_unlock(&x->lock);
1643 }
1644
1645 int xfrm_replay_check(struct xfrm_state *x,
1646                       struct sk_buff *skb, __be32 net_seq)
1647 {
1648         u32 diff;
1649         u32 seq = ntohl(net_seq);
1650
1651         if (unlikely(seq == 0))
1652                 goto err;
1653
1654         if (likely(seq > x->replay.seq))
1655                 return 0;
1656
1657         diff = x->replay.seq - seq;
1658         if (diff >= min_t(unsigned int, x->props.replay_window,
1659                           sizeof(x->replay.bitmap) * 8)) {
1660                 x->stats.replay_window++;
1661                 goto err;
1662         }
1663
1664         if (x->replay.bitmap & (1U << diff)) {
1665                 x->stats.replay++;
1666                 goto err;
1667         }
1668         return 0;
1669
1670 err:
1671         xfrm_audit_state_replay(x, skb, net_seq);
1672         return -EINVAL;
1673 }
1674
1675 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1676 {
1677         u32 diff;
1678         u32 seq = ntohl(net_seq);
1679
1680         if (seq > x->replay.seq) {
1681                 diff = seq - x->replay.seq;
1682                 if (diff < x->props.replay_window)
1683                         x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1684                 else
1685                         x->replay.bitmap = 1;
1686                 x->replay.seq = seq;
1687         } else {
1688                 diff = x->replay.seq - seq;
1689                 x->replay.bitmap |= (1U << diff);
1690         }
1691
1692         if (xfrm_aevent_is_on(xs_net(x)))
1693                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1694 }
1695
1696 static LIST_HEAD(xfrm_km_list);
1697 static DEFINE_RWLOCK(xfrm_km_lock);
1698
1699 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1700 {
1701         struct xfrm_mgr *km;
1702
1703         read_lock(&xfrm_km_lock);
1704         list_for_each_entry(km, &xfrm_km_list, list)
1705                 if (km->notify_policy)
1706                         km->notify_policy(xp, dir, c);
1707         read_unlock(&xfrm_km_lock);
1708 }
1709
1710 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1711 {
1712         struct xfrm_mgr *km;
1713         read_lock(&xfrm_km_lock);
1714         list_for_each_entry(km, &xfrm_km_list, list)
1715                 if (km->notify)
1716                         km->notify(x, c);
1717         read_unlock(&xfrm_km_lock);
1718 }
1719
1720 EXPORT_SYMBOL(km_policy_notify);
1721 EXPORT_SYMBOL(km_state_notify);
1722
1723 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1724 {
1725         struct net *net = xs_net(x);
1726         struct km_event c;
1727
1728         c.data.hard = hard;
1729         c.pid = pid;
1730         c.event = XFRM_MSG_EXPIRE;
1731         km_state_notify(x, &c);
1732
1733         if (hard)
1734                 wake_up(&net->xfrm.km_waitq);
1735 }
1736
1737 EXPORT_SYMBOL(km_state_expired);
1738 /*
1739  * We send to all registered managers regardless of failure
1740  * We are happy with one success
1741 */
1742 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1743 {
1744         int err = -EINVAL, acqret;
1745         struct xfrm_mgr *km;
1746
1747         read_lock(&xfrm_km_lock);
1748         list_for_each_entry(km, &xfrm_km_list, list) {
1749                 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1750                 if (!acqret)
1751                         err = acqret;
1752         }
1753         read_unlock(&xfrm_km_lock);
1754         return err;
1755 }
1756 EXPORT_SYMBOL(km_query);
1757
1758 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1759 {
1760         int err = -EINVAL;
1761         struct xfrm_mgr *km;
1762
1763         read_lock(&xfrm_km_lock);
1764         list_for_each_entry(km, &xfrm_km_list, list) {
1765                 if (km->new_mapping)
1766                         err = km->new_mapping(x, ipaddr, sport);
1767                 if (!err)
1768                         break;
1769         }
1770         read_unlock(&xfrm_km_lock);
1771         return err;
1772 }
1773 EXPORT_SYMBOL(km_new_mapping);
1774
1775 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1776 {
1777         struct net *net = xp_net(pol);
1778         struct km_event c;
1779
1780         c.data.hard = hard;
1781         c.pid = pid;
1782         c.event = XFRM_MSG_POLEXPIRE;
1783         km_policy_notify(pol, dir, &c);
1784
1785         if (hard)
1786                 wake_up(&net->xfrm.km_waitq);
1787 }
1788 EXPORT_SYMBOL(km_policy_expired);
1789
1790 #ifdef CONFIG_XFRM_MIGRATE
1791 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1792                struct xfrm_migrate *m, int num_migrate,
1793                struct xfrm_kmaddress *k)
1794 {
1795         int err = -EINVAL;
1796         int ret;
1797         struct xfrm_mgr *km;
1798
1799         read_lock(&xfrm_km_lock);
1800         list_for_each_entry(km, &xfrm_km_list, list) {
1801                 if (km->migrate) {
1802                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1803                         if (!ret)
1804                                 err = ret;
1805                 }
1806         }
1807         read_unlock(&xfrm_km_lock);
1808         return err;
1809 }
1810 EXPORT_SYMBOL(km_migrate);
1811 #endif
1812
1813 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1814 {
1815         int err = -EINVAL;
1816         int ret;
1817         struct xfrm_mgr *km;
1818
1819         read_lock(&xfrm_km_lock);
1820         list_for_each_entry(km, &xfrm_km_list, list) {
1821                 if (km->report) {
1822                         ret = km->report(net, proto, sel, addr);
1823                         if (!ret)
1824                                 err = ret;
1825                 }
1826         }
1827         read_unlock(&xfrm_km_lock);
1828         return err;
1829 }
1830 EXPORT_SYMBOL(km_report);
1831
1832 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1833 {
1834         int err;
1835         u8 *data;
1836         struct xfrm_mgr *km;
1837         struct xfrm_policy *pol = NULL;
1838
1839         if (optlen <= 0 || optlen > PAGE_SIZE)
1840                 return -EMSGSIZE;
1841
1842         data = kmalloc(optlen, GFP_KERNEL);
1843         if (!data)
1844                 return -ENOMEM;
1845
1846         err = -EFAULT;
1847         if (copy_from_user(data, optval, optlen))
1848                 goto out;
1849
1850         err = -EINVAL;
1851         read_lock(&xfrm_km_lock);
1852         list_for_each_entry(km, &xfrm_km_list, list) {
1853                 pol = km->compile_policy(sk, optname, data,
1854                                          optlen, &err);
1855                 if (err >= 0)
1856                         break;
1857         }
1858         read_unlock(&xfrm_km_lock);
1859
1860         if (err >= 0) {
1861                 xfrm_sk_policy_insert(sk, err, pol);
1862                 xfrm_pol_put(pol);
1863                 err = 0;
1864         }
1865
1866 out:
1867         kfree(data);
1868         return err;
1869 }
1870 EXPORT_SYMBOL(xfrm_user_policy);
1871
1872 int xfrm_register_km(struct xfrm_mgr *km)
1873 {
1874         write_lock_bh(&xfrm_km_lock);
1875         list_add_tail(&km->list, &xfrm_km_list);
1876         write_unlock_bh(&xfrm_km_lock);
1877         return 0;
1878 }
1879 EXPORT_SYMBOL(xfrm_register_km);
1880
1881 int xfrm_unregister_km(struct xfrm_mgr *km)
1882 {
1883         write_lock_bh(&xfrm_km_lock);
1884         list_del(&km->list);
1885         write_unlock_bh(&xfrm_km_lock);
1886         return 0;
1887 }
1888 EXPORT_SYMBOL(xfrm_unregister_km);
1889
1890 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1891 {
1892         int err = 0;
1893         if (unlikely(afinfo == NULL))
1894                 return -EINVAL;
1895         if (unlikely(afinfo->family >= NPROTO))
1896                 return -EAFNOSUPPORT;
1897         write_lock_bh(&xfrm_state_afinfo_lock);
1898         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1899                 err = -ENOBUFS;
1900         else
1901                 xfrm_state_afinfo[afinfo->family] = afinfo;
1902         write_unlock_bh(&xfrm_state_afinfo_lock);
1903         return err;
1904 }
1905 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1906
1907 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1908 {
1909         int err = 0;
1910         if (unlikely(afinfo == NULL))
1911                 return -EINVAL;
1912         if (unlikely(afinfo->family >= NPROTO))
1913                 return -EAFNOSUPPORT;
1914         write_lock_bh(&xfrm_state_afinfo_lock);
1915         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1916                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1917                         err = -EINVAL;
1918                 else
1919                         xfrm_state_afinfo[afinfo->family] = NULL;
1920         }
1921         write_unlock_bh(&xfrm_state_afinfo_lock);
1922         return err;
1923 }
1924 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1925
1926 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1927 {
1928         struct xfrm_state_afinfo *afinfo;
1929         if (unlikely(family >= NPROTO))
1930                 return NULL;
1931         read_lock(&xfrm_state_afinfo_lock);
1932         afinfo = xfrm_state_afinfo[family];
1933         if (unlikely(!afinfo))
1934                 read_unlock(&xfrm_state_afinfo_lock);
1935         return afinfo;
1936 }
1937
1938 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1939         __releases(xfrm_state_afinfo_lock)
1940 {
1941         read_unlock(&xfrm_state_afinfo_lock);
1942 }
1943
1944 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1945 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1946 {
1947         if (x->tunnel) {
1948                 struct xfrm_state *t = x->tunnel;
1949
1950                 if (atomic_read(&t->tunnel_users) == 2)
1951                         xfrm_state_delete(t);
1952                 atomic_dec(&t->tunnel_users);
1953                 xfrm_state_put(t);
1954                 x->tunnel = NULL;
1955         }
1956 }
1957 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1958
1959 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1960 {
1961         int res;
1962
1963         spin_lock_bh(&x->lock);
1964         if (x->km.state == XFRM_STATE_VALID &&
1965             x->type && x->type->get_mtu)
1966                 res = x->type->get_mtu(x, mtu);
1967         else
1968                 res = mtu - x->props.header_len;
1969         spin_unlock_bh(&x->lock);
1970         return res;
1971 }
1972
1973 int xfrm_init_state(struct xfrm_state *x)
1974 {
1975         struct xfrm_state_afinfo *afinfo;
1976         struct xfrm_mode *inner_mode;
1977         int family = x->props.family;
1978         int err;
1979
1980         err = -EAFNOSUPPORT;
1981         afinfo = xfrm_state_get_afinfo(family);
1982         if (!afinfo)
1983                 goto error;
1984
1985         err = 0;
1986         if (afinfo->init_flags)
1987                 err = afinfo->init_flags(x);
1988
1989         xfrm_state_put_afinfo(afinfo);
1990
1991         if (err)
1992                 goto error;
1993
1994         err = -EPROTONOSUPPORT;
1995
1996         if (x->sel.family != AF_UNSPEC) {
1997                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1998                 if (inner_mode == NULL)
1999                         goto error;
2000
2001                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2002                     family != x->sel.family) {
2003                         xfrm_put_mode(inner_mode);
2004                         goto error;
2005                 }
2006
2007                 x->inner_mode = inner_mode;
2008         } else {
2009                 struct xfrm_mode *inner_mode_iaf;
2010                 int iafamily = AF_INET;
2011
2012                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2013                 if (inner_mode == NULL)
2014                         goto error;
2015
2016                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2017                         xfrm_put_mode(inner_mode);
2018                         goto error;
2019                 }
2020                 x->inner_mode = inner_mode;
2021
2022                 if (x->props.family == AF_INET)
2023                         iafamily = AF_INET6;
2024
2025                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2026                 if (inner_mode_iaf) {
2027                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2028                                 x->inner_mode_iaf = inner_mode_iaf;
2029                         else
2030                                 xfrm_put_mode(inner_mode_iaf);
2031                 }
2032         }
2033
2034         x->type = xfrm_get_type(x->id.proto, family);
2035         if (x->type == NULL)
2036                 goto error;
2037
2038         err = x->type->init_state(x);
2039         if (err)
2040                 goto error;
2041
2042         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2043         if (x->outer_mode == NULL)
2044                 goto error;
2045
2046         x->km.state = XFRM_STATE_VALID;
2047
2048 error:
2049         return err;
2050 }
2051
2052 EXPORT_SYMBOL(xfrm_init_state);
2053
2054 int __net_init xfrm_state_init(struct net *net)
2055 {
2056         unsigned int sz;
2057
2058         INIT_LIST_HEAD(&net->xfrm.state_all);
2059
2060         sz = sizeof(struct hlist_head) * 8;
2061
2062         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2063         if (!net->xfrm.state_bydst)
2064                 goto out_bydst;
2065         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2066         if (!net->xfrm.state_bysrc)
2067                 goto out_bysrc;
2068         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2069         if (!net->xfrm.state_byspi)
2070                 goto out_byspi;
2071         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2072
2073         net->xfrm.state_num = 0;
2074         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2075         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2076         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2077         init_waitqueue_head(&net->xfrm.km_waitq);
2078         return 0;
2079
2080 out_byspi:
2081         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2082 out_bysrc:
2083         xfrm_hash_free(net->xfrm.state_bydst, sz);
2084 out_bydst:
2085         return -ENOMEM;
2086 }
2087
2088 void xfrm_state_fini(struct net *net)
2089 {
2090         struct xfrm_audit audit_info;
2091         unsigned int sz;
2092
2093         flush_work(&net->xfrm.state_hash_work);
2094         audit_info.loginuid = -1;
2095         audit_info.sessionid = -1;
2096         audit_info.secid = 0;
2097         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2098         flush_work(&net->xfrm.state_gc_work);
2099
2100         WARN_ON(!list_empty(&net->xfrm.state_all));
2101
2102         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2103         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2104         xfrm_hash_free(net->xfrm.state_byspi, sz);
2105         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2106         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2107         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2108         xfrm_hash_free(net->xfrm.state_bydst, sz);
2109 }
2110
2111 #ifdef CONFIG_AUDITSYSCALL
2112 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2113                                      struct audit_buffer *audit_buf)
2114 {
2115         struct xfrm_sec_ctx *ctx = x->security;
2116         u32 spi = ntohl(x->id.spi);
2117
2118         if (ctx)
2119                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2120                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2121
2122         switch(x->props.family) {
2123         case AF_INET:
2124                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2125                                  &x->props.saddr.a4, &x->id.daddr.a4);
2126                 break;
2127         case AF_INET6:
2128                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2129                                  x->props.saddr.a6, x->id.daddr.a6);
2130                 break;
2131         }
2132
2133         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2134 }
2135
2136 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2137                                       struct audit_buffer *audit_buf)
2138 {
2139         struct iphdr *iph4;
2140         struct ipv6hdr *iph6;
2141
2142         switch (family) {
2143         case AF_INET:
2144                 iph4 = ip_hdr(skb);
2145                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2146                                  &iph4->saddr, &iph4->daddr);
2147                 break;
2148         case AF_INET6:
2149                 iph6 = ipv6_hdr(skb);
2150                 audit_log_format(audit_buf,
2151                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2152                                  &iph6->saddr,&iph6->daddr,
2153                                  iph6->flow_lbl[0] & 0x0f,
2154                                  iph6->flow_lbl[1],
2155                                  iph6->flow_lbl[2]);
2156                 break;
2157         }
2158 }
2159
2160 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2161                           uid_t auid, u32 sessionid, u32 secid)
2162 {
2163         struct audit_buffer *audit_buf;
2164
2165         audit_buf = xfrm_audit_start("SAD-add");
2166         if (audit_buf == NULL)
2167                 return;
2168         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2169         xfrm_audit_helper_sainfo(x, audit_buf);
2170         audit_log_format(audit_buf, " res=%u", result);
2171         audit_log_end(audit_buf);
2172 }
2173 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2174
2175 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2176                              uid_t auid, u32 sessionid, u32 secid)
2177 {
2178         struct audit_buffer *audit_buf;
2179
2180         audit_buf = xfrm_audit_start("SAD-delete");
2181         if (audit_buf == NULL)
2182                 return;
2183         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2184         xfrm_audit_helper_sainfo(x, audit_buf);
2185         audit_log_format(audit_buf, " res=%u", result);
2186         audit_log_end(audit_buf);
2187 }
2188 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2189
2190 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2191                                       struct sk_buff *skb)
2192 {
2193         struct audit_buffer *audit_buf;
2194         u32 spi;
2195
2196         audit_buf = xfrm_audit_start("SA-replay-overflow");
2197         if (audit_buf == NULL)
2198                 return;
2199         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2200         /* don't record the sequence number because it's inherent in this kind
2201          * of audit message */
2202         spi = ntohl(x->id.spi);
2203         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2204         audit_log_end(audit_buf);
2205 }
2206 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2207
2208 static void xfrm_audit_state_replay(struct xfrm_state *x,
2209                              struct sk_buff *skb, __be32 net_seq)
2210 {
2211         struct audit_buffer *audit_buf;
2212         u32 spi;
2213
2214         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2215         if (audit_buf == NULL)
2216                 return;
2217         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2218         spi = ntohl(x->id.spi);
2219         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2220                          spi, spi, ntohl(net_seq));
2221         audit_log_end(audit_buf);
2222 }
2223
2224 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2225 {
2226         struct audit_buffer *audit_buf;
2227
2228         audit_buf = xfrm_audit_start("SA-notfound");
2229         if (audit_buf == NULL)
2230                 return;
2231         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2232         audit_log_end(audit_buf);
2233 }
2234 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2235
2236 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2237                                __be32 net_spi, __be32 net_seq)
2238 {
2239         struct audit_buffer *audit_buf;
2240         u32 spi;
2241
2242         audit_buf = xfrm_audit_start("SA-notfound");
2243         if (audit_buf == NULL)
2244                 return;
2245         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2246         spi = ntohl(net_spi);
2247         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2248                          spi, spi, ntohl(net_seq));
2249         audit_log_end(audit_buf);
2250 }
2251 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2252
2253 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2254                               struct sk_buff *skb, u8 proto)
2255 {
2256         struct audit_buffer *audit_buf;
2257         __be32 net_spi;
2258         __be32 net_seq;
2259
2260         audit_buf = xfrm_audit_start("SA-icv-failure");
2261         if (audit_buf == NULL)
2262                 return;
2263         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2264         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2265                 u32 spi = ntohl(net_spi);
2266                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2267                                  spi, spi, ntohl(net_seq));
2268         }
2269         audit_log_end(audit_buf);
2270 }
2271 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2272 #endif /* CONFIG_AUDITSYSCALL */