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                         continue;
 673
 674                 switch (family) {
 675                 case AF_INET:
 676                         if (x->id.daddr.a4 != daddr->a4)
 677                                 continue;
 678                         break;
 679                 case AF_INET6:
 680                         if (!ipv6_addr_equal((struct in6_addr *)daddr,
 681                                              (struct in6_addr *)
 682                                              x->id.daddr.a6))
 683                                 continue;
 684                         break;
 685                 }
 686
 687                 xfrm_state_hold(x);
 688                 return x;
 689         }
 690
 691         return NULL;
 692 }
 693
 694 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
 695 {
 696         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 697         struct xfrm_state *x;
 698         struct hlist_node *entry;
 699
 700         hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
 701                 if (x->props.family != family ||
 702                     x->id.proto     != proto)
 703                         continue;
 704
 705                 switch (family) {
 706                 case AF_INET:
 707                         if (x->id.daddr.a4 != daddr->a4 ||
 708                             x->props.saddr.a4 != saddr->a4)
 709                                 continue;
 710                         break;
 711                 case AF_INET6:
 712                         if (!ipv6_addr_equal((struct in6_addr *)daddr,
 713                                              (struct in6_addr *)
 714                                              x->id.daddr.a6) ||
 715                             !ipv6_addr_equal((struct in6_addr *)saddr,
 716                                              (struct in6_addr *)
 717                                              x->props.saddr.a6))
 718                                 continue;
 719                         break;
 720                 }
 721
 722                 xfrm_state_hold(x);
 723                 return x;
 724         }
 725
 726         return NULL;
 727 }
 728
 729 static inline struct xfrm_state *
 730 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 731 {
 732         struct net *net = xs_net(x);
 733
 734         if (use_spi)
 735                 return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi,
 736                                            x->id.proto, family);
 737         else
 738                 return __xfrm_state_lookup_byaddr(net, &x->id.daddr,
 739                                                   &x->props.saddr,
 740                                                   x->id.proto, family);
 741 }
 742
 743 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 744 {
 745         if (have_hash_collision &&
 746             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 747             net->xfrm.state_num > net->xfrm.state_hmask)
 748                 schedule_work(&net->xfrm.state_hash_work);
 749 }
 750
 751 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 752                                struct flowi *fl, unsigned short family,
 753                                xfrm_address_t *daddr, xfrm_address_t *saddr,
 754                                struct xfrm_state **best, int *acq_in_progress,
 755                                int *error)
 756 {
 757         /* Resolution logic:
 758          * 1. There is a valid state with matching selector. Done.
 759          * 2. Valid state with inappropriate selector. Skip.
 760          *
 761          * Entering area of "sysdeps".
 762          *
 763          * 3. If state is not valid, selector is temporary, it selects
 764          *    only session which triggered previous resolution. Key
 765          *    manager will do something to install a state with proper
 766          *    selector.
 767          */
 768         if (x->km.state == XFRM_STATE_VALID) {
 769                 if ((x->sel.family &&
 770                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 771                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 772                         return;
 773
 774                 if (!*best ||
 775                     (*best)->km.dying > x->km.dying ||
 776                     ((*best)->km.dying == x->km.dying &&
 777                      (*best)->curlft.add_time < x->curlft.add_time))
 778                         *best = x;
 779         } else if (x->km.state == XFRM_STATE_ACQ) {
 780                 *acq_in_progress = 1;
 781         } else if (x->km.state == XFRM_STATE_ERROR ||
 782                    x->km.state == XFRM_STATE_EXPIRED) {
 783                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 784                     security_xfrm_state_pol_flow_match(x, pol, fl))
 785                         *error = -ESRCH;
 786         }
 787 }
 788
 789 struct xfrm_state *
 790 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 791                 struct flowi *fl, struct xfrm_tmpl *tmpl,
 792                 struct xfrm_policy *pol, int *err,
 793                 unsigned short family)
 794 {
 795         static xfrm_address_t saddr_wildcard = { };
 796         struct net *net = xp_net(pol);
 797         unsigned int h;
 798         struct hlist_node *entry;
 799         struct xfrm_state *x, *x0, *to_put;
 800         int acquire_in_progress = 0;
 801         int error = 0;
 802         struct xfrm_state *best = NULL;
 803
 804         to_put = NULL;
 805
 806         spin_lock_bh(&xfrm_state_lock);
 807         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
 808         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 809                 if (x->props.family == family &&
 810                     x->props.reqid == tmpl->reqid &&
 811                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 812                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 813                     tmpl->mode == x->props.mode &&
 814                     tmpl->id.proto == x->id.proto &&
 815                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 816                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 817                                            &best, &acquire_in_progress, &error);
 818         }
 819         if (best)
 820                 goto found;
 821
 822         h = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
 823         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 824                 if (x->props.family == family &&
 825                     x->props.reqid == tmpl->reqid &&
 826                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 827                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 828                     tmpl->mode == x->props.mode &&
 829                     tmpl->id.proto == x->id.proto &&
 830                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 831                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 832                                            &best, &acquire_in_progress, &error);
 833         }
 834
 835 found:
 836         x = best;
 837         if (!x && !error && !acquire_in_progress) {
 838                 if (tmpl->id.spi &&
 839                     (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi,
 840                                               tmpl->id.proto, family)) != NULL) {
 841                         to_put = x0;
 842                         error = -EEXIST;
 843                         goto out;
 844                 }
 845                 x = xfrm_state_alloc(net);
 846                 if (x == NULL) {
 847                         error = -ENOMEM;
 848                         goto out;
 849                 }
 850                 /* Initialize temporary selector matching only
 851                  * to current session. */
 852                 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
 853
 854                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
 855                 if (error) {
 856                         x->km.state = XFRM_STATE_DEAD;
 857                         to_put = x;
 858                         x = NULL;
 859                         goto out;
 860                 }
 861
 862                 if (km_query(x, tmpl, pol) == 0) {
 863                         x->km.state = XFRM_STATE_ACQ;
 864                         list_add(&x->km.all, &net->xfrm.state_all);
 865                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 866                         h = xfrm_src_hash(net, daddr, saddr, family);
 867                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 868                         if (x->id.spi) {
 869                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
 870                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 871                         }
 872                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 873                         x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
 874                         add_timer(&x->timer);
 875                         net->xfrm.state_num++;
 876                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 877                 } else {
 878                         x->km.state = XFRM_STATE_DEAD;
 879                         to_put = x;
 880                         x = NULL;
 881                         error = -ESRCH;
 882                 }
 883         }
 884 out:
 885         if (x)
 886                 xfrm_state_hold(x);
 887         else
 888                 *err = acquire_in_progress ? -EAGAIN : error;
 889         spin_unlock_bh(&xfrm_state_lock);
 890         if (to_put)
 891                 xfrm_state_put(to_put);
 892         return x;
 893 }
 894
 895 struct xfrm_state *
 896 xfrm_stateonly_find(struct net *net,
 897                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 898                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 899 {
 900         unsigned int h;
 901         struct xfrm_state *rx = NULL, *x = NULL;
 902         struct hlist_node *entry;
 903
 904         spin_lock(&xfrm_state_lock);
 905         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 906         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 907                 if (x->props.family == family &&
 908                     x->props.reqid == reqid &&
 909                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 910                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 911                     mode == x->props.mode &&
 912                     proto == x->id.proto &&
 913                     x->km.state == XFRM_STATE_VALID) {
 914                         rx = x;
 915                         break;
 916                 }
 917         }
 918
 919         if (rx)
 920                 xfrm_state_hold(rx);
 921         spin_unlock(&xfrm_state_lock);
 922
 923
 924         return rx;
 925 }
 926 EXPORT_SYMBOL(xfrm_stateonly_find);
 927
 928 static void __xfrm_state_insert(struct xfrm_state *x)
 929 {
 930         struct net *net = xs_net(x);
 931         unsigned int h;
 932
 933         x->genid = ++xfrm_state_genid;
 934
 935         list_add(&x->km.all, &net->xfrm.state_all);
 936
 937         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 938                           x->props.reqid, x->props.family);
 939         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 940
 941         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 942         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 943
 944         if (x->id.spi) {
 945                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 946                                   x->props.family);
 947
 948                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 949         }
 950
 951         mod_timer(&x->timer, jiffies + HZ);
 952         if (x->replay_maxage)
 953                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 954
 955         wake_up(&net->xfrm.km_waitq);
 956
 957         net->xfrm.state_num++;
 958
 959         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 960 }
 961
 962 /* xfrm_state_lock is held */
 963 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 964 {
 965         struct net *net = xs_net(xnew);
 966         unsigned short family = xnew->props.family;
 967         u32 reqid = xnew->props.reqid;
 968         struct xfrm_state *x;
 969         struct hlist_node *entry;
 970         unsigned int h;
 971
 972         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 973         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 974                 if (x->props.family     == family &&
 975                     x->props.reqid      == reqid &&
 976                     !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
 977                     !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
 978                         x->genid = xfrm_state_genid;
 979         }
 980 }
 981
 982 void xfrm_state_insert(struct xfrm_state *x)
 983 {
 984         spin_lock_bh(&xfrm_state_lock);
 985         __xfrm_state_bump_genids(x);
 986         __xfrm_state_insert(x);
 987         spin_unlock_bh(&xfrm_state_lock);
 988 }
 989 EXPORT_SYMBOL(xfrm_state_insert);
 990
 991 /* xfrm_state_lock is held */
 992 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)
 993 {
 994         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 995         struct hlist_node *entry;
 996         struct xfrm_state *x;
 997
 998         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 999                 if (x->props.reqid  != reqid ||
1000                     x->props.mode   != mode ||
1001                     x->props.family != family ||
1002                     x->km.state     != XFRM_STATE_ACQ ||
1003                     x->id.spi       != 0 ||
1004                     x->id.proto     != proto)
1005                         continue;
1006
1007                 switch (family) {
1008                 case AF_INET:
1009                         if (x->id.daddr.a4    != daddr->a4 ||
1010                             x->props.saddr.a4 != saddr->a4)
1011                                 continue;
1012                         break;
1013                 case AF_INET6:
1014                         if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6,
1015                                              (struct in6_addr *)daddr) ||
1016                             !ipv6_addr_equal((struct in6_addr *)
1017                                              x->props.saddr.a6,
1018                                              (struct in6_addr *)saddr))
1019                                 continue;
1020                         break;
1021                 }
1022
1023                 xfrm_state_hold(x);
1024                 return x;
1025         }
1026
1027         if (!create)
1028                 return NULL;
1029
1030         x = xfrm_state_alloc(net);
1031         if (likely(x)) {
1032                 switch (family) {
1033                 case AF_INET:
1034                         x->sel.daddr.a4 = daddr->a4;
1035                         x->sel.saddr.a4 = saddr->a4;
1036                         x->sel.prefixlen_d = 32;
1037                         x->sel.prefixlen_s = 32;
1038                         x->props.saddr.a4 = saddr->a4;
1039                         x->id.daddr.a4 = daddr->a4;
1040                         break;
1041
1042                 case AF_INET6:
1043                         ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1044                                        (struct in6_addr *)daddr);
1045                         ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1046                                        (struct in6_addr *)saddr);
1047                         x->sel.prefixlen_d = 128;
1048                         x->sel.prefixlen_s = 128;
1049                         ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1050                                        (struct in6_addr *)saddr);
1051                         ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1052                                        (struct in6_addr *)daddr);
1053                         break;
1054                 }
1055
1056                 x->km.state = XFRM_STATE_ACQ;
1057                 x->id.proto = proto;
1058                 x->props.family = family;
1059                 x->props.mode = mode;
1060                 x->props.reqid = reqid;
1061                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1062                 xfrm_state_hold(x);
1063                 x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
1064                 add_timer(&x->timer);
1065                 list_add(&x->km.all, &net->xfrm.state_all);
1066                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1067                 h = xfrm_src_hash(net, daddr, saddr, family);
1068                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1069
1070                 net->xfrm.state_num++;
1071
1072                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1073         }
1074
1075         return x;
1076 }
1077
1078 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq);
1079
1080 int xfrm_state_add(struct xfrm_state *x)
1081 {
1082         struct net *net = xs_net(x);
1083         struct xfrm_state *x1, *to_put;
1084         int family;
1085         int err;
1086         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1087
1088         family = x->props.family;
1089
1090         to_put = NULL;
1091
1092         spin_lock_bh(&xfrm_state_lock);
1093
1094         x1 = __xfrm_state_locate(x, use_spi, family);
1095         if (x1) {
1096                 to_put = x1;
1097                 x1 = NULL;
1098                 err = -EEXIST;
1099                 goto out;
1100         }
1101
1102         if (use_spi && x->km.seq) {
1103                 x1 = __xfrm_find_acq_byseq(net, x->km.seq);
1104                 if (x1 && ((x1->id.proto != x->id.proto) ||
1105                     xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1106                         to_put = x1;
1107                         x1 = NULL;
1108                 }
1109         }
1110
1111         if (use_spi && !x1)
1112                 x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid,
1113                                      x->id.proto,
1114                                      &x->id.daddr, &x->props.saddr, 0);
1115
1116         __xfrm_state_bump_genids(x);
1117         __xfrm_state_insert(x);
1118         err = 0;
1119
1120 out:
1121         spin_unlock_bh(&xfrm_state_lock);
1122
1123         if (x1) {
1124                 xfrm_state_delete(x1);
1125                 xfrm_state_put(x1);
1126         }
1127
1128         if (to_put)
1129                 xfrm_state_put(to_put);
1130
1131         return err;
1132 }
1133 EXPORT_SYMBOL(xfrm_state_add);
1134
1135 #ifdef CONFIG_XFRM_MIGRATE
1136 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1137 {
1138         struct net *net = xs_net(orig);
1139         int err = -ENOMEM;
1140         struct xfrm_state *x = xfrm_state_alloc(net);
1141         if (!x)
1142                 goto error;
1143
1144         memcpy(&x->id, &orig->id, sizeof(x->id));
1145         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1146         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1147         x->props.mode = orig->props.mode;
1148         x->props.replay_window = orig->props.replay_window;
1149         x->props.reqid = orig->props.reqid;
1150         x->props.family = orig->props.family;
1151         x->props.saddr = orig->props.saddr;
1152
1153         if (orig->aalg) {
1154                 x->aalg = xfrm_algo_clone(orig->aalg);
1155                 if (!x->aalg)
1156                         goto error;
1157         }
1158         x->props.aalgo = orig->props.aalgo;
1159
1160         if (orig->ealg) {
1161                 x->ealg = xfrm_algo_clone(orig->ealg);
1162                 if (!x->ealg)
1163                         goto error;
1164         }
1165         x->props.ealgo = orig->props.ealgo;
1166
1167         if (orig->calg) {
1168                 x->calg = xfrm_algo_clone(orig->calg);
1169                 if (!x->calg)
1170                         goto error;
1171         }
1172         x->props.calgo = orig->props.calgo;
1173
1174         if (orig->encap) {
1175                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1176                 if (!x->encap)
1177                         goto error;
1178         }
1179
1180         if (orig->coaddr) {
1181                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1182                                     GFP_KERNEL);
1183                 if (!x->coaddr)
1184                         goto error;
1185         }
1186
1187         err = xfrm_init_state(x);
1188         if (err)
1189                 goto error;
1190
1191         x->props.flags = orig->props.flags;
1192
1193         x->curlft.add_time = orig->curlft.add_time;
1194         x->km.state = orig->km.state;
1195         x->km.seq = orig->km.seq;
1196
1197         return x;
1198
1199  error:
1200         if (errp)
1201                 *errp = err;
1202         if (x) {
1203                 kfree(x->aalg);
1204                 kfree(x->ealg);
1205                 kfree(x->calg);
1206                 kfree(x->encap);
1207                 kfree(x->coaddr);
1208         }
1209         kfree(x);
1210         return NULL;
1211 }
1212
1213 /* xfrm_state_lock is held */
1214 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1215 {
1216         unsigned int h;
1217         struct xfrm_state *x;
1218         struct hlist_node *entry;
1219
1220         if (m->reqid) {
1221                 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1222                                   m->reqid, m->old_family);
1223                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1224                         if (x->props.mode != m->mode ||
1225                             x->id.proto != m->proto)
1226                                 continue;
1227                         if (m->reqid && x->props.reqid != m->reqid)
1228                                 continue;
1229                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1230                                           m->old_family) ||
1231                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1232                                           m->old_family))
1233                                 continue;
1234                         xfrm_state_hold(x);
1235                         return x;
1236                 }
1237         } else {
1238                 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1239                                   m->old_family);
1240                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1241                         if (x->props.mode != m->mode ||
1242                             x->id.proto != m->proto)
1243                                 continue;
1244                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1245                                           m->old_family) ||
1246                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1247                                           m->old_family))
1248                                 continue;
1249                         xfrm_state_hold(x);
1250                         return x;
1251                 }
1252         }
1253
1254         return NULL;
1255 }
1256 EXPORT_SYMBOL(xfrm_migrate_state_find);
1257
1258 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1259                                        struct xfrm_migrate *m)
1260 {
1261         struct xfrm_state *xc;
1262         int err;
1263
1264         xc = xfrm_state_clone(x, &err);
1265         if (!xc)
1266                 return NULL;
1267
1268         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1269         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1270
1271         /* add state */
1272         if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1273                 /* a care is needed when the destination address of the
1274                    state is to be updated as it is a part of triplet */
1275                 xfrm_state_insert(xc);
1276         } else {
1277                 if ((err = xfrm_state_add(xc)) < 0)
1278                         goto error;
1279         }
1280
1281         return xc;
1282 error:
1283         kfree(xc);
1284         return NULL;
1285 }
1286 EXPORT_SYMBOL(xfrm_state_migrate);
1287 #endif
1288
1289 int xfrm_state_update(struct xfrm_state *x)
1290 {
1291         struct xfrm_state *x1, *to_put;
1292         int err;
1293         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1294
1295         to_put = NULL;
1296
1297         spin_lock_bh(&xfrm_state_lock);
1298         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1299
1300         err = -ESRCH;
1301         if (!x1)
1302                 goto out;
1303
1304         if (xfrm_state_kern(x1)) {
1305                 to_put = x1;
1306                 err = -EEXIST;
1307                 goto out;
1308         }
1309
1310         if (x1->km.state == XFRM_STATE_ACQ) {
1311                 __xfrm_state_insert(x);
1312                 x = NULL;
1313         }
1314         err = 0;
1315
1316 out:
1317         spin_unlock_bh(&xfrm_state_lock);
1318
1319         if (to_put)
1320                 xfrm_state_put(to_put);
1321
1322         if (err)
1323                 return err;
1324
1325         if (!x) {
1326                 xfrm_state_delete(x1);
1327                 xfrm_state_put(x1);
1328                 return 0;
1329         }
1330
1331         err = -EINVAL;
1332         spin_lock_bh(&x1->lock);
1333         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1334                 if (x->encap && x1->encap)
1335                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1336                 if (x->coaddr && x1->coaddr) {
1337                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1338                 }
1339                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1340                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1341                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1342                 x1->km.dying = 0;
1343
1344                 mod_timer(&x1->timer, jiffies + HZ);
1345                 if (x1->curlft.use_time)
1346                         xfrm_state_check_expire(x1);
1347
1348                 err = 0;
1349         }
1350         spin_unlock_bh(&x1->lock);
1351
1352         xfrm_state_put(x1);
1353
1354         return err;
1355 }
1356 EXPORT_SYMBOL(xfrm_state_update);
1357
1358 int xfrm_state_check_expire(struct xfrm_state *x)
1359 {
1360         if (!x->curlft.use_time)
1361                 x->curlft.use_time = get_seconds();
1362
1363         if (x->km.state != XFRM_STATE_VALID)
1364                 return -EINVAL;
1365
1366         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1367             x->curlft.packets >= x->lft.hard_packet_limit) {
1368                 x->km.state = XFRM_STATE_EXPIRED;
1369                 mod_timer(&x->timer, jiffies);
1370                 return -EINVAL;
1371         }
1372
1373         if (!x->km.dying &&
1374             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1375              x->curlft.packets >= x->lft.soft_packet_limit)) {
1376                 x->km.dying = 1;
1377                 km_state_expired(x, 0, 0);
1378         }
1379         return 0;
1380 }
1381 EXPORT_SYMBOL(xfrm_state_check_expire);
1382
1383 struct xfrm_state *
1384 xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto,
1385                   unsigned short family)
1386 {
1387         struct xfrm_state *x;
1388
1389         spin_lock_bh(&xfrm_state_lock);
1390         x = __xfrm_state_lookup(net, daddr, spi, proto, family);
1391         spin_unlock_bh(&xfrm_state_lock);
1392         return x;
1393 }
1394 EXPORT_SYMBOL(xfrm_state_lookup);
1395
1396 struct xfrm_state *
1397 xfrm_state_lookup_byaddr(struct net *net,
1398                          xfrm_address_t *daddr, xfrm_address_t *saddr,
1399                          u8 proto, unsigned short family)
1400 {
1401         struct xfrm_state *x;
1402
1403         spin_lock_bh(&xfrm_state_lock);
1404         x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family);
1405         spin_unlock_bh(&xfrm_state_lock);
1406         return x;
1407 }
1408 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1409
1410 struct xfrm_state *
1411 xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1412               xfrm_address_t *daddr, xfrm_address_t *saddr,
1413               int create, unsigned short family)
1414 {
1415         struct xfrm_state *x;
1416
1417         spin_lock_bh(&xfrm_state_lock);
1418         x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create);
1419         spin_unlock_bh(&xfrm_state_lock);
1420
1421         return x;
1422 }
1423 EXPORT_SYMBOL(xfrm_find_acq);
1424
1425 #ifdef CONFIG_XFRM_SUB_POLICY
1426 int
1427 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1428                unsigned short family)
1429 {
1430         int err = 0;
1431         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1432         if (!afinfo)
1433                 return -EAFNOSUPPORT;
1434
1435         spin_lock_bh(&xfrm_state_lock);
1436         if (afinfo->tmpl_sort)
1437                 err = afinfo->tmpl_sort(dst, src, n);
1438         spin_unlock_bh(&xfrm_state_lock);
1439         xfrm_state_put_afinfo(afinfo);
1440         return err;
1441 }
1442 EXPORT_SYMBOL(xfrm_tmpl_sort);
1443
1444 int
1445 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1446                 unsigned short family)
1447 {
1448         int err = 0;
1449         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1450         if (!afinfo)
1451                 return -EAFNOSUPPORT;
1452
1453         spin_lock_bh(&xfrm_state_lock);
1454         if (afinfo->state_sort)
1455                 err = afinfo->state_sort(dst, src, n);
1456         spin_unlock_bh(&xfrm_state_lock);
1457         xfrm_state_put_afinfo(afinfo);
1458         return err;
1459 }
1460 EXPORT_SYMBOL(xfrm_state_sort);
1461 #endif
1462
1463 /* Silly enough, but I'm lazy to build resolution list */
1464
1465 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq)
1466 {
1467         int i;
1468
1469         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1470                 struct hlist_node *entry;
1471                 struct xfrm_state *x;
1472
1473                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1474                         if (x->km.seq == seq &&
1475                             x->km.state == XFRM_STATE_ACQ) {
1476                                 xfrm_state_hold(x);
1477                                 return x;
1478                         }
1479                 }
1480         }
1481         return NULL;
1482 }
1483
1484 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq)
1485 {
1486         struct xfrm_state *x;
1487
1488         spin_lock_bh(&xfrm_state_lock);
1489         x = __xfrm_find_acq_byseq(net, seq);
1490         spin_unlock_bh(&xfrm_state_lock);
1491         return x;
1492 }
1493 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1494
1495 u32 xfrm_get_acqseq(void)
1496 {
1497         u32 res;
1498         static u32 acqseq;
1499         static DEFINE_SPINLOCK(acqseq_lock);
1500
1501         spin_lock_bh(&acqseq_lock);
1502         res = (++acqseq ? : ++acqseq);
1503         spin_unlock_bh(&acqseq_lock);
1504         return res;
1505 }
1506 EXPORT_SYMBOL(xfrm_get_acqseq);
1507
1508 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1509 {
1510         struct net *net = xs_net(x);
1511         unsigned int h;
1512         struct xfrm_state *x0;
1513         int err = -ENOENT;
1514         __be32 minspi = htonl(low);
1515         __be32 maxspi = htonl(high);
1516
1517         spin_lock_bh(&x->lock);
1518         if (x->km.state == XFRM_STATE_DEAD)
1519                 goto unlock;
1520
1521         err = 0;
1522         if (x->id.spi)
1523                 goto unlock;
1524
1525         err = -ENOENT;
1526
1527         if (minspi == maxspi) {
1528                 x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family);
1529                 if (x0) {
1530                         xfrm_state_put(x0);
1531                         goto unlock;
1532                 }
1533                 x->id.spi = minspi;
1534         } else {
1535                 u32 spi = 0;
1536                 for (h=0; h<high-low+1; h++) {
1537                         spi = low + net_random()%(high-low+1);
1538                         x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1539                         if (x0 == NULL) {
1540                                 x->id.spi = htonl(spi);
1541                                 break;
1542                         }
1543                         xfrm_state_put(x0);
1544                 }
1545         }
1546         if (x->id.spi) {
1547                 spin_lock_bh(&xfrm_state_lock);
1548                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1549                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1550                 spin_unlock_bh(&xfrm_state_lock);
1551
1552                 err = 0;
1553         }
1554
1555 unlock:
1556         spin_unlock_bh(&x->lock);
1557
1558         return err;
1559 }
1560 EXPORT_SYMBOL(xfrm_alloc_spi);
1561
1562 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1563                     int (*func)(struct xfrm_state *, int, void*),
1564                     void *data)
1565 {
1566         struct xfrm_state *state;
1567         struct xfrm_state_walk *x;
1568         int err = 0;
1569
1570         if (walk->seq != 0 && list_empty(&walk->all))
1571                 return 0;
1572
1573         spin_lock_bh(&xfrm_state_lock);
1574         if (list_empty(&walk->all))
1575                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1576         else
1577                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1578         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1579                 if (x->state == XFRM_STATE_DEAD)
1580                         continue;
1581                 state = container_of(x, struct xfrm_state, km);
1582                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1583                         continue;
1584                 err = func(state, walk->seq, data);
1585                 if (err) {
1586                         list_move_tail(&walk->all, &x->all);
1587                         goto out;
1588                 }
1589                 walk->seq++;
1590         }
1591         if (walk->seq == 0) {
1592                 err = -ENOENT;
1593                 goto out;
1594         }
1595         list_del_init(&walk->all);
1596 out:
1597         spin_unlock_bh(&xfrm_state_lock);
1598         return err;
1599 }
1600 EXPORT_SYMBOL(xfrm_state_walk);
1601
1602 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1603 {
1604         INIT_LIST_HEAD(&walk->all);
1605         walk->proto = proto;
1606         walk->state = XFRM_STATE_DEAD;
1607         walk->seq = 0;
1608 }
1609 EXPORT_SYMBOL(xfrm_state_walk_init);
1610
1611 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1612 {
1613         if (list_empty(&walk->all))
1614                 return;
1615
1616         spin_lock_bh(&xfrm_state_lock);
1617         list_del(&walk->all);
1618         spin_lock_bh(&xfrm_state_lock);
1619 }
1620 EXPORT_SYMBOL(xfrm_state_walk_done);
1621
1622
1623 void xfrm_replay_notify(struct xfrm_state *x, int event)
1624 {
1625         struct km_event c;
1626         /* we send notify messages in case
1627          *  1. we updated on of the sequence numbers, and the seqno difference
1628          *     is at least x->replay_maxdiff, in this case we also update the
1629          *     timeout of our timer function
1630          *  2. if x->replay_maxage has elapsed since last update,
1631          *     and there were changes
1632          *
1633          *  The state structure must be locked!
1634          */
1635
1636         switch (event) {
1637         case XFRM_REPLAY_UPDATE:
1638                 if (x->replay_maxdiff &&
1639                     (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1640                     (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1641                         if (x->xflags & XFRM_TIME_DEFER)
1642                                 event = XFRM_REPLAY_TIMEOUT;
1643                         else
1644                                 return;
1645                 }
1646
1647                 break;
1648
1649         case XFRM_REPLAY_TIMEOUT:
1650                 if ((x->replay.seq == x->preplay.seq) &&
1651                     (x->replay.bitmap == x->preplay.bitmap) &&
1652                     (x->replay.oseq == x->preplay.oseq)) {
1653                         x->xflags |= XFRM_TIME_DEFER;
1654                         return;
1655                 }
1656
1657                 break;
1658         }
1659
1660         memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1661         c.event = XFRM_MSG_NEWAE;
1662         c.data.aevent = event;
1663         km_state_notify(x, &c);
1664
1665         if (x->replay_maxage &&
1666             !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1667                 x->xflags &= ~XFRM_TIME_DEFER;
1668 }
1669
1670 static void xfrm_replay_timer_handler(unsigned long data)
1671 {
1672         struct xfrm_state *x = (struct xfrm_state*)data;
1673
1674         spin_lock(&x->lock);
1675
1676         if (x->km.state == XFRM_STATE_VALID) {
1677                 if (xfrm_aevent_is_on(xs_net(x)))
1678                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1679                 else
1680                         x->xflags |= XFRM_TIME_DEFER;
1681         }
1682
1683         spin_unlock(&x->lock);
1684 }
1685
1686 int xfrm_replay_check(struct xfrm_state *x,
1687                       struct sk_buff *skb, __be32 net_seq)
1688 {
1689         u32 diff;
1690         u32 seq = ntohl(net_seq);
1691
1692         if (unlikely(seq == 0))
1693                 goto err;
1694
1695         if (likely(seq > x->replay.seq))
1696                 return 0;
1697
1698         diff = x->replay.seq - seq;
1699         if (diff >= min_t(unsigned int, x->props.replay_window,
1700                           sizeof(x->replay.bitmap) * 8)) {
1701                 x->stats.replay_window++;
1702                 goto err;
1703         }
1704
1705         if (x->replay.bitmap & (1U << diff)) {
1706                 x->stats.replay++;
1707                 goto err;
1708         }
1709         return 0;
1710
1711 err:
1712         xfrm_audit_state_replay(x, skb, net_seq);
1713         return -EINVAL;
1714 }
1715
1716 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1717 {
1718         u32 diff;
1719         u32 seq = ntohl(net_seq);
1720
1721         if (seq > x->replay.seq) {
1722                 diff = seq - x->replay.seq;
1723                 if (diff < x->props.replay_window)
1724                         x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1725                 else
1726                         x->replay.bitmap = 1;
1727                 x->replay.seq = seq;
1728         } else {
1729                 diff = x->replay.seq - seq;
1730                 x->replay.bitmap |= (1U << diff);
1731         }
1732
1733         if (xfrm_aevent_is_on(xs_net(x)))
1734                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1735 }
1736
1737 static LIST_HEAD(xfrm_km_list);
1738 static DEFINE_RWLOCK(xfrm_km_lock);
1739
1740 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1741 {
1742         struct xfrm_mgr *km;
1743
1744         read_lock(&xfrm_km_lock);
1745         list_for_each_entry(km, &xfrm_km_list, list)
1746                 if (km->notify_policy)
1747                         km->notify_policy(xp, dir, c);
1748         read_unlock(&xfrm_km_lock);
1749 }
1750
1751 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1752 {
1753         struct xfrm_mgr *km;
1754         read_lock(&xfrm_km_lock);
1755         list_for_each_entry(km, &xfrm_km_list, list)
1756                 if (km->notify)
1757                         km->notify(x, c);
1758         read_unlock(&xfrm_km_lock);
1759 }
1760
1761 EXPORT_SYMBOL(km_policy_notify);
1762 EXPORT_SYMBOL(km_state_notify);
1763
1764 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1765 {
1766         struct net *net = xs_net(x);
1767         struct km_event c;
1768
1769         c.data.hard = hard;
1770         c.pid = pid;
1771         c.event = XFRM_MSG_EXPIRE;
1772         km_state_notify(x, &c);
1773
1774         if (hard)
1775                 wake_up(&net->xfrm.km_waitq);
1776 }
1777
1778 EXPORT_SYMBOL(km_state_expired);
1779 /*
1780  * We send to all registered managers regardless of failure
1781  * We are happy with one success
1782 */
1783 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1784 {
1785         int err = -EINVAL, acqret;
1786         struct xfrm_mgr *km;
1787
1788         read_lock(&xfrm_km_lock);
1789         list_for_each_entry(km, &xfrm_km_list, list) {
1790                 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1791                 if (!acqret)
1792                         err = acqret;
1793         }
1794         read_unlock(&xfrm_km_lock);
1795         return err;
1796 }
1797 EXPORT_SYMBOL(km_query);
1798
1799 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1800 {
1801         int err = -EINVAL;
1802         struct xfrm_mgr *km;
1803
1804         read_lock(&xfrm_km_lock);
1805         list_for_each_entry(km, &xfrm_km_list, list) {
1806                 if (km->new_mapping)
1807                         err = km->new_mapping(x, ipaddr, sport);
1808                 if (!err)
1809                         break;
1810         }
1811         read_unlock(&xfrm_km_lock);
1812         return err;
1813 }
1814 EXPORT_SYMBOL(km_new_mapping);
1815
1816 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1817 {
1818         struct net *net = xp_net(pol);
1819         struct km_event c;
1820
1821         c.data.hard = hard;
1822         c.pid = pid;
1823         c.event = XFRM_MSG_POLEXPIRE;
1824         km_policy_notify(pol, dir, &c);
1825
1826         if (hard)
1827                 wake_up(&net->xfrm.km_waitq);
1828 }
1829 EXPORT_SYMBOL(km_policy_expired);
1830
1831 #ifdef CONFIG_XFRM_MIGRATE
1832 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1833                struct xfrm_migrate *m, int num_migrate,
1834                struct xfrm_kmaddress *k)
1835 {
1836         int err = -EINVAL;
1837         int ret;
1838         struct xfrm_mgr *km;
1839
1840         read_lock(&xfrm_km_lock);
1841         list_for_each_entry(km, &xfrm_km_list, list) {
1842                 if (km->migrate) {
1843                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1844                         if (!ret)
1845                                 err = ret;
1846                 }
1847         }
1848         read_unlock(&xfrm_km_lock);
1849         return err;
1850 }
1851 EXPORT_SYMBOL(km_migrate);
1852 #endif
1853
1854 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1855 {
1856         int err = -EINVAL;
1857         int ret;
1858         struct xfrm_mgr *km;
1859
1860         read_lock(&xfrm_km_lock);
1861         list_for_each_entry(km, &xfrm_km_list, list) {
1862                 if (km->report) {
1863                         ret = km->report(net, proto, sel, addr);
1864                         if (!ret)
1865                                 err = ret;
1866                 }
1867         }
1868         read_unlock(&xfrm_km_lock);
1869         return err;
1870 }
1871 EXPORT_SYMBOL(km_report);
1872
1873 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1874 {
1875         int err;
1876         u8 *data;
1877         struct xfrm_mgr *km;
1878         struct xfrm_policy *pol = NULL;
1879
1880         if (optlen <= 0 || optlen > PAGE_SIZE)
1881                 return -EMSGSIZE;
1882
1883         data = kmalloc(optlen, GFP_KERNEL);
1884         if (!data)
1885                 return -ENOMEM;
1886
1887         err = -EFAULT;
1888         if (copy_from_user(data, optval, optlen))
1889                 goto out;
1890
1891         err = -EINVAL;
1892         read_lock(&xfrm_km_lock);
1893         list_for_each_entry(km, &xfrm_km_list, list) {
1894                 pol = km->compile_policy(sk, optname, data,
1895                                          optlen, &err);
1896                 if (err >= 0)
1897                         break;
1898         }
1899         read_unlock(&xfrm_km_lock);
1900
1901         if (err >= 0) {
1902                 xfrm_sk_policy_insert(sk, err, pol);
1903                 xfrm_pol_put(pol);
1904                 err = 0;
1905         }
1906
1907 out:
1908         kfree(data);
1909         return err;
1910 }
1911 EXPORT_SYMBOL(xfrm_user_policy);
1912
1913 int xfrm_register_km(struct xfrm_mgr *km)
1914 {
1915         write_lock_bh(&xfrm_km_lock);
1916         list_add_tail(&km->list, &xfrm_km_list);
1917         write_unlock_bh(&xfrm_km_lock);
1918         return 0;
1919 }
1920 EXPORT_SYMBOL(xfrm_register_km);
1921
1922 int xfrm_unregister_km(struct xfrm_mgr *km)
1923 {
1924         write_lock_bh(&xfrm_km_lock);
1925         list_del(&km->list);
1926         write_unlock_bh(&xfrm_km_lock);
1927         return 0;
1928 }
1929 EXPORT_SYMBOL(xfrm_unregister_km);
1930
1931 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1932 {
1933         int err = 0;
1934         if (unlikely(afinfo == NULL))
1935                 return -EINVAL;
1936         if (unlikely(afinfo->family >= NPROTO))
1937                 return -EAFNOSUPPORT;
1938         write_lock_bh(&xfrm_state_afinfo_lock);
1939         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1940                 err = -ENOBUFS;
1941         else
1942                 xfrm_state_afinfo[afinfo->family] = afinfo;
1943         write_unlock_bh(&xfrm_state_afinfo_lock);
1944         return err;
1945 }
1946 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1947
1948 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1949 {
1950         int err = 0;
1951         if (unlikely(afinfo == NULL))
1952                 return -EINVAL;
1953         if (unlikely(afinfo->family >= NPROTO))
1954                 return -EAFNOSUPPORT;
1955         write_lock_bh(&xfrm_state_afinfo_lock);
1956         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1957                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1958                         err = -EINVAL;
1959                 else
1960                         xfrm_state_afinfo[afinfo->family] = NULL;
1961         }
1962         write_unlock_bh(&xfrm_state_afinfo_lock);
1963         return err;
1964 }
1965 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1966
1967 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1968 {
1969         struct xfrm_state_afinfo *afinfo;
1970         if (unlikely(family >= NPROTO))
1971                 return NULL;
1972         read_lock(&xfrm_state_afinfo_lock);
1973         afinfo = xfrm_state_afinfo[family];
1974         if (unlikely(!afinfo))
1975                 read_unlock(&xfrm_state_afinfo_lock);
1976         return afinfo;
1977 }
1978
1979 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1980         __releases(xfrm_state_afinfo_lock)
1981 {
1982         read_unlock(&xfrm_state_afinfo_lock);
1983 }
1984
1985 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1986 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1987 {
1988         if (x->tunnel) {
1989                 struct xfrm_state *t = x->tunnel;
1990
1991                 if (atomic_read(&t->tunnel_users) == 2)
1992                         xfrm_state_delete(t);
1993                 atomic_dec(&t->tunnel_users);
1994                 xfrm_state_put(t);
1995                 x->tunnel = NULL;
1996         }
1997 }
1998 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1999
2000 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2001 {
2002         int res;
2003
2004         spin_lock_bh(&x->lock);
2005         if (x->km.state == XFRM_STATE_VALID &&
2006             x->type && x->type->get_mtu)
2007                 res = x->type->get_mtu(x, mtu);
2008         else
2009                 res = mtu - x->props.header_len;
2010         spin_unlock_bh(&x->lock);
2011         return res;
2012 }
2013
2014 int xfrm_init_state(struct xfrm_state *x)
2015 {
2016         struct xfrm_state_afinfo *afinfo;
2017         struct xfrm_mode *inner_mode;
2018         int family = x->props.family;
2019         int err;
2020
2021         err = -EAFNOSUPPORT;
2022         afinfo = xfrm_state_get_afinfo(family);
2023         if (!afinfo)
2024                 goto error;
2025
2026         err = 0;
2027         if (afinfo->init_flags)
2028                 err = afinfo->init_flags(x);
2029
2030         xfrm_state_put_afinfo(afinfo);
2031
2032         if (err)
2033                 goto error;
2034
2035         err = -EPROTONOSUPPORT;
2036
2037         if (x->sel.family != AF_UNSPEC) {
2038                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2039                 if (inner_mode == NULL)
2040                         goto error;
2041
2042                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2043                     family != x->sel.family) {
2044                         xfrm_put_mode(inner_mode);
2045                         goto error;
2046                 }
2047
2048                 x->inner_mode = inner_mode;
2049         } else {
2050                 struct xfrm_mode *inner_mode_iaf;
2051                 int iafamily = AF_INET;
2052
2053                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2054                 if (inner_mode == NULL)
2055                         goto error;
2056
2057                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2058                         xfrm_put_mode(inner_mode);
2059                         goto error;
2060                 }
2061                 x->inner_mode = inner_mode;
2062
2063                 if (x->props.family == AF_INET)
2064                         iafamily = AF_INET6;
2065
2066                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2067                 if (inner_mode_iaf) {
2068                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2069                                 x->inner_mode_iaf = inner_mode_iaf;
2070                         else
2071                                 xfrm_put_mode(inner_mode_iaf);
2072                 }
2073         }
2074
2075         x->type = xfrm_get_type(x->id.proto, family);
2076         if (x->type == NULL)
2077                 goto error;
2078
2079         err = x->type->init_state(x);
2080         if (err)
2081                 goto error;
2082
2083         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2084         if (x->outer_mode == NULL)
2085                 goto error;
2086
2087         x->km.state = XFRM_STATE_VALID;
2088
2089 error:
2090         return err;
2091 }
2092
2093 EXPORT_SYMBOL(xfrm_init_state);
2094
2095 int __net_init xfrm_state_init(struct net *net)
2096 {
2097         unsigned int sz;
2098
2099         INIT_LIST_HEAD(&net->xfrm.state_all);
2100
2101         sz = sizeof(struct hlist_head) * 8;
2102
2103         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2104         if (!net->xfrm.state_bydst)
2105                 goto out_bydst;
2106         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2107         if (!net->xfrm.state_bysrc)
2108                 goto out_bysrc;
2109         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2110         if (!net->xfrm.state_byspi)
2111                 goto out_byspi;
2112         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2113
2114         net->xfrm.state_num = 0;
2115         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2116         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2117         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2118         init_waitqueue_head(&net->xfrm.km_waitq);
2119         return 0;
2120
2121 out_byspi:
2122         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2123 out_bysrc:
2124         xfrm_hash_free(net->xfrm.state_bydst, sz);
2125 out_bydst:
2126         return -ENOMEM;
2127 }
2128
2129 void xfrm_state_fini(struct net *net)
2130 {
2131         struct xfrm_audit audit_info;
2132         unsigned int sz;
2133
2134         flush_work(&net->xfrm.state_hash_work);
2135         audit_info.loginuid = -1;
2136         audit_info.sessionid = -1;
2137         audit_info.secid = 0;
2138         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2139         flush_work(&net->xfrm.state_gc_work);
2140
2141         WARN_ON(!list_empty(&net->xfrm.state_all));
2142
2143         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2144         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2145         xfrm_hash_free(net->xfrm.state_byspi, sz);
2146         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2147         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2148         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2149         xfrm_hash_free(net->xfrm.state_bydst, sz);
2150 }
2151
2152 #ifdef CONFIG_AUDITSYSCALL
2153 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2154                                      struct audit_buffer *audit_buf)
2155 {
2156         struct xfrm_sec_ctx *ctx = x->security;
2157         u32 spi = ntohl(x->id.spi);
2158
2159         if (ctx)
2160                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2161                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2162
2163         switch(x->props.family) {
2164         case AF_INET:
2165                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2166                                  &x->props.saddr.a4, &x->id.daddr.a4);
2167                 break;
2168         case AF_INET6:
2169                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2170                                  x->props.saddr.a6, x->id.daddr.a6);
2171                 break;
2172         }
2173
2174         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2175 }
2176
2177 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2178                                       struct audit_buffer *audit_buf)
2179 {
2180         struct iphdr *iph4;
2181         struct ipv6hdr *iph6;
2182
2183         switch (family) {
2184         case AF_INET:
2185                 iph4 = ip_hdr(skb);
2186                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2187                                  &iph4->saddr, &iph4->daddr);
2188                 break;
2189         case AF_INET6:
2190                 iph6 = ipv6_hdr(skb);
2191                 audit_log_format(audit_buf,
2192                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2193                                  &iph6->saddr,&iph6->daddr,
2194                                  iph6->flow_lbl[0] & 0x0f,
2195                                  iph6->flow_lbl[1],
2196                                  iph6->flow_lbl[2]);
2197                 break;
2198         }
2199 }
2200
2201 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2202                           uid_t auid, u32 sessionid, u32 secid)
2203 {
2204         struct audit_buffer *audit_buf;
2205
2206         audit_buf = xfrm_audit_start("SAD-add");
2207         if (audit_buf == NULL)
2208                 return;
2209         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2210         xfrm_audit_helper_sainfo(x, audit_buf);
2211         audit_log_format(audit_buf, " res=%u", result);
2212         audit_log_end(audit_buf);
2213 }
2214 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2215
2216 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2217                              uid_t auid, u32 sessionid, u32 secid)
2218 {
2219         struct audit_buffer *audit_buf;
2220
2221         audit_buf = xfrm_audit_start("SAD-delete");
2222         if (audit_buf == NULL)
2223                 return;
2224         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2225         xfrm_audit_helper_sainfo(x, audit_buf);
2226         audit_log_format(audit_buf, " res=%u", result);
2227         audit_log_end(audit_buf);
2228 }
2229 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2230
2231 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2232                                       struct sk_buff *skb)
2233 {
2234         struct audit_buffer *audit_buf;
2235         u32 spi;
2236
2237         audit_buf = xfrm_audit_start("SA-replay-overflow");
2238         if (audit_buf == NULL)
2239                 return;
2240         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2241         /* don't record the sequence number because it's inherent in this kind
2242          * of audit message */
2243         spi = ntohl(x->id.spi);
2244         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2245         audit_log_end(audit_buf);
2246 }
2247 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2248
2249 static void xfrm_audit_state_replay(struct xfrm_state *x,
2250                              struct sk_buff *skb, __be32 net_seq)
2251 {
2252         struct audit_buffer *audit_buf;
2253         u32 spi;
2254
2255         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2256         if (audit_buf == NULL)
2257                 return;
2258         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2259         spi = ntohl(x->id.spi);
2260         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2261                          spi, spi, ntohl(net_seq));
2262         audit_log_end(audit_buf);
2263 }
2264
2265 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2266 {
2267         struct audit_buffer *audit_buf;
2268
2269         audit_buf = xfrm_audit_start("SA-notfound");
2270         if (audit_buf == NULL)
2271                 return;
2272         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2273         audit_log_end(audit_buf);
2274 }
2275 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2276
2277 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2278                                __be32 net_spi, __be32 net_seq)
2279 {
2280         struct audit_buffer *audit_buf;
2281         u32 spi;
2282
2283         audit_buf = xfrm_audit_start("SA-notfound");
2284         if (audit_buf == NULL)
2285                 return;
2286         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2287         spi = ntohl(net_spi);
2288         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2289                          spi, spi, ntohl(net_seq));
2290         audit_log_end(audit_buf);
2291 }
2292 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2293
2294 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2295                               struct sk_buff *skb, u8 proto)
2296 {
2297         struct audit_buffer *audit_buf;
2298         __be32 net_spi;
2299         __be32 net_seq;
2300
2301         audit_buf = xfrm_audit_start("SA-icv-failure");
2302         if (audit_buf == NULL)
2303                 return;
2304         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2305         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2306                 u32 spi = ntohl(net_spi);
2307                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2308                                  spi, spi, ntohl(net_seq));
2309         }
2310         audit_log_end(audit_buf);
2311 }
2312 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2313 #endif /* CONFIG_AUDITSYSCALL */