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