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