git.oblomov.eu Git - linux-2.6/blob - net/xfrm/xfrm_policy.c

   1 /*
   2  * xfrm_policy.c
   3  *
   4  * Changes:
   5  *      Mitsuru KANDA @USAGI
   6  *      Kazunori MIYAZAWA @USAGI
   7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   8  *              IPv6 support
   9  *      Kazunori MIYAZAWA @USAGI
  10  *      YOSHIFUJI Hideaki
  11  *              Split up af-specific portion
  12  *      Derek Atkins <derek@ihtfp.com>          Add the post_input processor
  13  *
  14  */
  15
  16 #include <asm/bug.h>
  17 #include <linux/config.h>
  18 #include <linux/slab.h>
  19 #include <linux/kmod.h>
  20 #include <linux/list.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/notifier.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/netfilter.h>
  26 #include <linux/module.h>
  27 #include <net/xfrm.h>
  28 #include <net/ip.h>
  29
  30 DECLARE_MUTEX(xfrm_cfg_sem);
  31 EXPORT_SYMBOL(xfrm_cfg_sem);
  32
  33 static DEFINE_RWLOCK(xfrm_policy_lock);
  34
  35 struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
  36 EXPORT_SYMBOL(xfrm_policy_list);
  37
  38 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
  39 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
  40
  41 static kmem_cache_t *xfrm_dst_cache __read_mostly;
  42
  43 static struct work_struct xfrm_policy_gc_work;
  44 static struct list_head xfrm_policy_gc_list =
  45         LIST_HEAD_INIT(xfrm_policy_gc_list);
  46 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
  47
  48 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
  49 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
  50
  51 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
  52 {
  53         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
  54         struct xfrm_type_map *typemap;
  55         int err = 0;
  56
  57         if (unlikely(afinfo == NULL))
  58                 return -EAFNOSUPPORT;
  59         typemap = afinfo->type_map;
  60
  61         write_lock(&typemap->lock);
  62         if (likely(typemap->map[type->proto] == NULL))
  63                 typemap->map[type->proto] = type;
  64         else
  65                 err = -EEXIST;
  66         write_unlock(&typemap->lock);
  67         xfrm_policy_put_afinfo(afinfo);
  68         return err;
  69 }
  70 EXPORT_SYMBOL(xfrm_register_type);
  71
  72 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
  73 {
  74         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
  75         struct xfrm_type_map *typemap;
  76         int err = 0;
  77
  78         if (unlikely(afinfo == NULL))
  79                 return -EAFNOSUPPORT;
  80         typemap = afinfo->type_map;
  81
  82         write_lock(&typemap->lock);
  83         if (unlikely(typemap->map[type->proto] != type))
  84                 err = -ENOENT;
  85         else
  86                 typemap->map[type->proto] = NULL;
  87         write_unlock(&typemap->lock);
  88         xfrm_policy_put_afinfo(afinfo);
  89         return err;
  90 }
  91 EXPORT_SYMBOL(xfrm_unregister_type);
  92
  93 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
  94 {
  95         struct xfrm_policy_afinfo *afinfo;
  96         struct xfrm_type_map *typemap;
  97         struct xfrm_type *type;
  98         int modload_attempted = 0;
  99
 100 retry:
 101         afinfo = xfrm_policy_get_afinfo(family);
 102         if (unlikely(afinfo == NULL))
 103                 return NULL;
 104         typemap = afinfo->type_map;
 105
 106         read_lock(&typemap->lock);
 107         type = typemap->map[proto];
 108         if (unlikely(type && !try_module_get(type->owner)))
 109                 type = NULL;
 110         read_unlock(&typemap->lock);
 111         if (!type && !modload_attempted) {
 112                 xfrm_policy_put_afinfo(afinfo);
 113                 request_module("xfrm-type-%d-%d",
 114                                (int) family, (int) proto);
 115                 modload_attempted = 1;
 116                 goto retry;
 117         }
 118
 119         xfrm_policy_put_afinfo(afinfo);
 120         return type;
 121 }
 122
 123 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
 124                     unsigned short family)
 125 {
 126         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 127         int err = 0;
 128
 129         if (unlikely(afinfo == NULL))
 130                 return -EAFNOSUPPORT;
 131
 132         if (likely(afinfo->dst_lookup != NULL))
 133                 err = afinfo->dst_lookup(dst, fl);
 134         else
 135                 err = -EINVAL;
 136         xfrm_policy_put_afinfo(afinfo);
 137         return err;
 138 }
 139 EXPORT_SYMBOL(xfrm_dst_lookup);
 140
 141 void xfrm_put_type(struct xfrm_type *type)
 142 {
 143         module_put(type->owner);
 144 }
 145
 146 static inline unsigned long make_jiffies(long secs)
 147 {
 148         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 149                 return MAX_SCHEDULE_TIMEOUT-1;
 150         else
 151                 return secs*HZ;
 152 }
 153
 154 static void xfrm_policy_timer(unsigned long data)
 155 {
 156         struct xfrm_policy *xp = (struct xfrm_policy*)data;
 157         unsigned long now = (unsigned long)xtime.tv_sec;
 158         long next = LONG_MAX;
 159         int warn = 0;
 160         int dir;
 161
 162         read_lock(&xp->lock);
 163
 164         if (xp->dead)
 165                 goto out;
 166
 167         dir = xfrm_policy_id2dir(xp->index);
 168
 169         if (xp->lft.hard_add_expires_seconds) {
 170                 long tmo = xp->lft.hard_add_expires_seconds +
 171                         xp->curlft.add_time - now;
 172                 if (tmo <= 0)
 173                         goto expired;
 174                 if (tmo < next)
 175                         next = tmo;
 176         }
 177         if (xp->lft.hard_use_expires_seconds) {
 178                 long tmo = xp->lft.hard_use_expires_seconds +
 179                         (xp->curlft.use_time ? : xp->curlft.add_time) - now;
 180                 if (tmo <= 0)
 181                         goto expired;
 182                 if (tmo < next)
 183                         next = tmo;
 184         }
 185         if (xp->lft.soft_add_expires_seconds) {
 186                 long tmo = xp->lft.soft_add_expires_seconds +
 187                         xp->curlft.add_time - now;
 188                 if (tmo <= 0) {
 189                         warn = 1;
 190                         tmo = XFRM_KM_TIMEOUT;
 191                 }
 192                 if (tmo < next)
 193                         next = tmo;
 194         }
 195         if (xp->lft.soft_use_expires_seconds) {
 196                 long tmo = xp->lft.soft_use_expires_seconds +
 197                         (xp->curlft.use_time ? : xp->curlft.add_time) - now;
 198                 if (tmo <= 0) {
 199                         warn = 1;
 200                         tmo = XFRM_KM_TIMEOUT;
 201                 }
 202                 if (tmo < next)
 203                         next = tmo;
 204         }
 205
 206         if (warn)
 207                 km_policy_expired(xp, dir, 0);
 208         if (next != LONG_MAX &&
 209             !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
 210                 xfrm_pol_hold(xp);
 211
 212 out:
 213         read_unlock(&xp->lock);
 214         xfrm_pol_put(xp);
 215         return;
 216
 217 expired:
 218         read_unlock(&xp->lock);
 219         if (!xfrm_policy_delete(xp, dir))
 220                 km_policy_expired(xp, dir, 1);
 221         xfrm_pol_put(xp);
 222 }
 223
 224
 225 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
 226  * SPD calls.
 227  */
 228
 229 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
 230 {
 231         struct xfrm_policy *policy;
 232
 233         policy = kmalloc(sizeof(struct xfrm_policy), gfp);
 234
 235         if (policy) {
 236                 memset(policy, 0, sizeof(struct xfrm_policy));
 237                 atomic_set(&policy->refcnt, 1);
 238                 rwlock_init(&policy->lock);
 239                 init_timer(&policy->timer);
 240                 policy->timer.data = (unsigned long)policy;
 241                 policy->timer.function = xfrm_policy_timer;
 242         }
 243         return policy;
 244 }
 245 EXPORT_SYMBOL(xfrm_policy_alloc);
 246
 247 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
 248
 249 void __xfrm_policy_destroy(struct xfrm_policy *policy)
 250 {
 251         BUG_ON(!policy->dead);
 252
 253         BUG_ON(policy->bundles);
 254
 255         if (del_timer(&policy->timer))
 256                 BUG();
 257
 258         security_xfrm_policy_free(policy);
 259         kfree(policy);
 260 }
 261 EXPORT_SYMBOL(__xfrm_policy_destroy);
 262
 263 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
 264 {
 265         struct dst_entry *dst;
 266
 267         while ((dst = policy->bundles) != NULL) {
 268                 policy->bundles = dst->next;
 269                 dst_free(dst);
 270         }
 271
 272         if (del_timer(&policy->timer))
 273                 atomic_dec(&policy->refcnt);
 274
 275         if (atomic_read(&policy->refcnt) > 1)
 276                 flow_cache_flush();
 277
 278         xfrm_pol_put(policy);
 279 }
 280
 281 static void xfrm_policy_gc_task(void *data)
 282 {
 283         struct xfrm_policy *policy;
 284         struct list_head *entry, *tmp;
 285         struct list_head gc_list = LIST_HEAD_INIT(gc_list);
 286
 287         spin_lock_bh(&xfrm_policy_gc_lock);
 288         list_splice_init(&xfrm_policy_gc_list, &gc_list);
 289         spin_unlock_bh(&xfrm_policy_gc_lock);
 290
 291         list_for_each_safe(entry, tmp, &gc_list) {
 292                 policy = list_entry(entry, struct xfrm_policy, list);
 293                 xfrm_policy_gc_kill(policy);
 294         }
 295 }
 296
 297 /* Rule must be locked. Release descentant resources, announce
 298  * entry dead. The rule must be unlinked from lists to the moment.
 299  */
 300
 301 static void xfrm_policy_kill(struct xfrm_policy *policy)
 302 {
 303         int dead;
 304
 305         write_lock_bh(&policy->lock);
 306         dead = policy->dead;
 307         policy->dead = 1;
 308         write_unlock_bh(&policy->lock);
 309
 310         if (unlikely(dead)) {
 311                 WARN_ON(1);
 312                 return;
 313         }
 314
 315         spin_lock(&xfrm_policy_gc_lock);
 316         list_add(&policy->list, &xfrm_policy_gc_list);
 317         spin_unlock(&xfrm_policy_gc_lock);
 318
 319         schedule_work(&xfrm_policy_gc_work);
 320 }
 321
 322 /* Generate new index... KAME seems to generate them ordered by cost
 323  * of an absolute inpredictability of ordering of rules. This will not pass. */
 324 static u32 xfrm_gen_index(int dir)
 325 {
 326         u32 idx;
 327         struct xfrm_policy *p;
 328         static u32 idx_generator;
 329
 330         for (;;) {
 331                 idx = (idx_generator | dir);
 332                 idx_generator += 8;
 333                 if (idx == 0)
 334                         idx = 8;
 335                 for (p = xfrm_policy_list[dir]; p; p = p->next) {
 336                         if (p->index == idx)
 337                                 break;
 338                 }
 339                 if (!p)
 340                         return idx;
 341         }
 342 }
 343
 344 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
 345 {
 346         struct xfrm_policy *pol, **p;
 347         struct xfrm_policy *delpol = NULL;
 348         struct xfrm_policy **newpos = NULL;
 349         struct dst_entry *gc_list;
 350
 351         write_lock_bh(&xfrm_policy_lock);
 352         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) {
 353                 if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 &&
 354                     xfrm_sec_ctx_match(pol->security, policy->security)) {
 355                         if (excl) {
 356                                 write_unlock_bh(&xfrm_policy_lock);
 357                                 return -EEXIST;
 358                         }
 359                         *p = pol->next;
 360                         delpol = pol;
 361                         if (policy->priority > pol->priority)
 362                                 continue;
 363                 } else if (policy->priority >= pol->priority) {
 364                         p = &pol->next;
 365                         continue;
 366                 }
 367                 if (!newpos)
 368                         newpos = p;
 369                 if (delpol)
 370                         break;
 371                 p = &pol->next;
 372         }
 373         if (newpos)
 374                 p = newpos;
 375         xfrm_pol_hold(policy);
 376         policy->next = *p;
 377         *p = policy;
 378         atomic_inc(&flow_cache_genid);
 379         policy->index = delpol ? delpol->index : xfrm_gen_index(dir);
 380         policy->curlft.add_time = (unsigned long)xtime.tv_sec;
 381         policy->curlft.use_time = 0;
 382         if (!mod_timer(&policy->timer, jiffies + HZ))
 383                 xfrm_pol_hold(policy);
 384         write_unlock_bh(&xfrm_policy_lock);
 385
 386         if (delpol)
 387                 xfrm_policy_kill(delpol);
 388
 389         read_lock_bh(&xfrm_policy_lock);
 390         gc_list = NULL;
 391         for (policy = policy->next; policy; policy = policy->next) {
 392                 struct dst_entry *dst;
 393
 394                 write_lock(&policy->lock);
 395                 dst = policy->bundles;
 396                 if (dst) {
 397                         struct dst_entry *tail = dst;
 398                         while (tail->next)
 399                                 tail = tail->next;
 400                         tail->next = gc_list;
 401                         gc_list = dst;
 402
 403                         policy->bundles = NULL;
 404                 }
 405                 write_unlock(&policy->lock);
 406         }
 407         read_unlock_bh(&xfrm_policy_lock);
 408
 409         while (gc_list) {
 410                 struct dst_entry *dst = gc_list;
 411
 412                 gc_list = dst->next;
 413                 dst_free(dst);
 414         }
 415
 416         return 0;
 417 }
 418 EXPORT_SYMBOL(xfrm_policy_insert);
 419
 420 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
 421                                           struct xfrm_sec_ctx *ctx, int delete)
 422 {
 423         struct xfrm_policy *pol, **p;
 424
 425         write_lock_bh(&xfrm_policy_lock);
 426         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
 427                 if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) &&
 428                     (xfrm_sec_ctx_match(ctx, pol->security))) {
 429                         xfrm_pol_hold(pol);
 430                         if (delete)
 431                                 *p = pol->next;
 432                         break;
 433                 }
 434         }
 435         write_unlock_bh(&xfrm_policy_lock);
 436
 437         if (pol && delete) {
 438                 atomic_inc(&flow_cache_genid);
 439                 xfrm_policy_kill(pol);
 440         }
 441         return pol;
 442 }
 443 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
 444
 445 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete)
 446 {
 447         struct xfrm_policy *pol, **p;
 448
 449         write_lock_bh(&xfrm_policy_lock);
 450         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
 451                 if (pol->index == id) {
 452                         xfrm_pol_hold(pol);
 453                         if (delete)
 454                                 *p = pol->next;
 455                         break;
 456                 }
 457         }
 458         write_unlock_bh(&xfrm_policy_lock);
 459
 460         if (pol && delete) {
 461                 atomic_inc(&flow_cache_genid);
 462                 xfrm_policy_kill(pol);
 463         }
 464         return pol;
 465 }
 466 EXPORT_SYMBOL(xfrm_policy_byid);
 467
 468 void xfrm_policy_flush(void)
 469 {
 470         struct xfrm_policy *xp;
 471         int dir;
 472
 473         write_lock_bh(&xfrm_policy_lock);
 474         for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
 475                 while ((xp = xfrm_policy_list[dir]) != NULL) {
 476                         xfrm_policy_list[dir] = xp->next;
 477                         write_unlock_bh(&xfrm_policy_lock);
 478
 479                         xfrm_policy_kill(xp);
 480
 481                         write_lock_bh(&xfrm_policy_lock);
 482                 }
 483         }
 484         atomic_inc(&flow_cache_genid);
 485         write_unlock_bh(&xfrm_policy_lock);
 486 }
 487 EXPORT_SYMBOL(xfrm_policy_flush);
 488
 489 int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*),
 490                      void *data)
 491 {
 492         struct xfrm_policy *xp;
 493         int dir;
 494         int count = 0;
 495         int error = 0;
 496
 497         read_lock_bh(&xfrm_policy_lock);
 498         for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
 499                 for (xp = xfrm_policy_list[dir]; xp; xp = xp->next)
 500                         count++;
 501         }
 502
 503         if (count == 0) {
 504                 error = -ENOENT;
 505                 goto out;
 506         }
 507
 508         for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
 509                 for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) {
 510                         error = func(xp, dir%XFRM_POLICY_MAX, --count, data);
 511                         if (error)
 512                                 goto out;
 513                 }
 514         }
 515
 516 out:
 517         read_unlock_bh(&xfrm_policy_lock);
 518         return error;
 519 }
 520 EXPORT_SYMBOL(xfrm_policy_walk);
 521
 522 /* Find policy to apply to this flow. */
 523
 524 static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir,
 525                                void **objp, atomic_t **obj_refp)
 526 {
 527         struct xfrm_policy *pol;
 528
 529         read_lock_bh(&xfrm_policy_lock);
 530         for (pol = xfrm_policy_list[dir]; pol; pol = pol->next) {
 531                 struct xfrm_selector *sel = &pol->selector;
 532                 int match;
 533
 534                 if (pol->family != family)
 535                         continue;
 536
 537                 match = xfrm_selector_match(sel, fl, family);
 538
 539                 if (match) {
 540                         if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) {
 541                                 xfrm_pol_hold(pol);
 542                                 break;
 543                         }
 544                 }
 545         }
 546         read_unlock_bh(&xfrm_policy_lock);
 547         if ((*objp = (void *) pol) != NULL)
 548                 *obj_refp = &pol->refcnt;
 549 }
 550
 551 static inline int policy_to_flow_dir(int dir)
 552 {
 553         if (XFRM_POLICY_IN == FLOW_DIR_IN &&
 554             XFRM_POLICY_OUT == FLOW_DIR_OUT &&
 555             XFRM_POLICY_FWD == FLOW_DIR_FWD)
 556                 return dir;
 557         switch (dir) {
 558         default:
 559         case XFRM_POLICY_IN:
 560                 return FLOW_DIR_IN;
 561         case XFRM_POLICY_OUT:
 562                 return FLOW_DIR_OUT;
 563         case XFRM_POLICY_FWD:
 564                 return FLOW_DIR_FWD;
 565         };
 566 }
 567
 568 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid)
 569 {
 570         struct xfrm_policy *pol;
 571
 572         read_lock_bh(&xfrm_policy_lock);
 573         if ((pol = sk->sk_policy[dir]) != NULL) {
 574                 int match = xfrm_selector_match(&pol->selector, fl,
 575                                                 sk->sk_family);
 576                 int err = 0;
 577
 578                 if (match)
 579                   err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir));
 580
 581                 if (match && !err)
 582                         xfrm_pol_hold(pol);
 583                 else
 584                         pol = NULL;
 585         }
 586         read_unlock_bh(&xfrm_policy_lock);
 587         return pol;
 588 }
 589
 590 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
 591 {
 592         pol->next = xfrm_policy_list[dir];
 593         xfrm_policy_list[dir] = pol;
 594         xfrm_pol_hold(pol);
 595 }
 596
 597 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
 598                                                 int dir)
 599 {
 600         struct xfrm_policy **polp;
 601
 602         for (polp = &xfrm_policy_list[dir];
 603              *polp != NULL; polp = &(*polp)->next) {
 604                 if (*polp == pol) {
 605                         *polp = pol->next;
 606                         return pol;
 607                 }
 608         }
 609         return NULL;
 610 }
 611
 612 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
 613 {
 614         write_lock_bh(&xfrm_policy_lock);
 615         pol = __xfrm_policy_unlink(pol, dir);
 616         write_unlock_bh(&xfrm_policy_lock);
 617         if (pol) {
 618                 if (dir < XFRM_POLICY_MAX)
 619                         atomic_inc(&flow_cache_genid);
 620                 xfrm_policy_kill(pol);
 621                 return 0;
 622         }
 623         return -ENOENT;
 624 }
 625
 626 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
 627 {
 628         struct xfrm_policy *old_pol;
 629
 630         write_lock_bh(&xfrm_policy_lock);
 631         old_pol = sk->sk_policy[dir];
 632         sk->sk_policy[dir] = pol;
 633         if (pol) {
 634                 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
 635                 pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir);
 636                 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
 637         }
 638         if (old_pol)
 639                 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
 640         write_unlock_bh(&xfrm_policy_lock);
 641
 642         if (old_pol) {
 643                 xfrm_policy_kill(old_pol);
 644         }
 645         return 0;
 646 }
 647
 648 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
 649 {
 650         struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
 651
 652         if (newp) {
 653                 newp->selector = old->selector;
 654                 if (security_xfrm_policy_clone(old, newp)) {
 655                         kfree(newp);
 656                         return NULL;  /* ENOMEM */
 657                 }
 658                 newp->lft = old->lft;
 659                 newp->curlft = old->curlft;
 660                 newp->action = old->action;
 661                 newp->flags = old->flags;
 662                 newp->xfrm_nr = old->xfrm_nr;
 663                 newp->index = old->index;
 664                 memcpy(newp->xfrm_vec, old->xfrm_vec,
 665                        newp->xfrm_nr*sizeof(struct xfrm_tmpl));
 666                 write_lock_bh(&xfrm_policy_lock);
 667                 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
 668                 write_unlock_bh(&xfrm_policy_lock);
 669                 xfrm_pol_put(newp);
 670         }
 671         return newp;
 672 }
 673
 674 int __xfrm_sk_clone_policy(struct sock *sk)
 675 {
 676         struct xfrm_policy *p0 = sk->sk_policy[0],
 677                            *p1 = sk->sk_policy[1];
 678
 679         sk->sk_policy[0] = sk->sk_policy[1] = NULL;
 680         if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
 681                 return -ENOMEM;
 682         if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
 683                 return -ENOMEM;
 684         return 0;
 685 }
 686
 687 /* Resolve list of templates for the flow, given policy. */
 688
 689 static int
 690 xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl,
 691                   struct xfrm_state **xfrm,
 692                   unsigned short family)
 693 {
 694         int nx;
 695         int i, error;
 696         xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
 697         xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
 698
 699         for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
 700                 struct xfrm_state *x;
 701                 xfrm_address_t *remote = daddr;
 702                 xfrm_address_t *local  = saddr;
 703                 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
 704
 705                 if (tmpl->mode) {
 706                         remote = &tmpl->id.daddr;
 707                         local = &tmpl->saddr;
 708                 }
 709
 710                 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
 711
 712                 if (x && x->km.state == XFRM_STATE_VALID) {
 713                         xfrm[nx++] = x;
 714                         daddr = remote;
 715                         saddr = local;
 716                         continue;
 717                 }
 718                 if (x) {
 719                         error = (x->km.state == XFRM_STATE_ERROR ?
 720                                  -EINVAL : -EAGAIN);
 721                         xfrm_state_put(x);
 722                 }
 723
 724                 if (!tmpl->optional)
 725                         goto fail;
 726         }
 727         return nx;
 728
 729 fail:
 730         for (nx--; nx>=0; nx--)
 731                 xfrm_state_put(xfrm[nx]);
 732         return error;
 733 }
 734
 735 /* Check that the bundle accepts the flow and its components are
 736  * still valid.
 737  */
 738
 739 static struct dst_entry *
 740 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
 741 {
 742         struct dst_entry *x;
 743         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 744         if (unlikely(afinfo == NULL))
 745                 return ERR_PTR(-EINVAL);
 746         x = afinfo->find_bundle(fl, policy);
 747         xfrm_policy_put_afinfo(afinfo);
 748         return x;
 749 }
 750
 751 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
 752  * all the metrics... Shortly, bundle a bundle.
 753  */
 754
 755 static int
 756 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
 757                    struct flowi *fl, struct dst_entry **dst_p,
 758                    unsigned short family)
 759 {
 760         int err;
 761         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 762         if (unlikely(afinfo == NULL))
 763                 return -EINVAL;
 764         err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
 765         xfrm_policy_put_afinfo(afinfo);
 766         return err;
 767 }
 768
 769
 770 static int stale_bundle(struct dst_entry *dst);
 771
 772 /* Main function: finds/creates a bundle for given flow.
 773  *
 774  * At the moment we eat a raw IP route. Mostly to speed up lookups
 775  * on interfaces with disabled IPsec.
 776  */
 777 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
 778                 struct sock *sk, int flags)
 779 {
 780         struct xfrm_policy *policy;
 781         struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
 782         struct dst_entry *dst, *dst_orig = *dst_p;
 783         int nx = 0;
 784         int err;
 785         u32 genid;
 786         u16 family = dst_orig->ops->family;
 787         u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
 788         u32 sk_sid = security_sk_sid(sk, fl, dir);
 789 restart:
 790         genid = atomic_read(&flow_cache_genid);
 791         policy = NULL;
 792         if (sk && sk->sk_policy[1])
 793                 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid);
 794
 795         if (!policy) {
 796                 /* To accelerate a bit...  */
 797                 if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT])
 798                         return 0;
 799
 800                 policy = flow_cache_lookup(fl, sk_sid, family, dir,
 801                                            xfrm_policy_lookup);
 802         }
 803
 804         if (!policy)
 805                 return 0;
 806
 807         policy->curlft.use_time = (unsigned long)xtime.tv_sec;
 808
 809         switch (policy->action) {
 810         case XFRM_POLICY_BLOCK:
 811                 /* Prohibit the flow */
 812                 err = -EPERM;
 813                 goto error;
 814
 815         case XFRM_POLICY_ALLOW:
 816                 if (policy->xfrm_nr == 0) {
 817                         /* Flow passes not transformed. */
 818                         xfrm_pol_put(policy);
 819                         return 0;
 820                 }
 821
 822                 /* Try to find matching bundle.
 823                  *
 824                  * LATER: help from flow cache. It is optional, this
 825                  * is required only for output policy.
 826                  */
 827                 dst = xfrm_find_bundle(fl, policy, family);
 828                 if (IS_ERR(dst)) {
 829                         err = PTR_ERR(dst);
 830                         goto error;
 831                 }
 832
 833                 if (dst)
 834                         break;
 835
 836                 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
 837
 838                 if (unlikely(nx<0)) {
 839                         err = nx;
 840                         if (err == -EAGAIN && flags) {
 841                                 DECLARE_WAITQUEUE(wait, current);
 842
 843                                 add_wait_queue(&km_waitq, &wait);
 844                                 set_current_state(TASK_INTERRUPTIBLE);
 845                                 schedule();
 846                                 set_current_state(TASK_RUNNING);
 847                                 remove_wait_queue(&km_waitq, &wait);
 848
 849                                 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
 850
 851                                 if (nx == -EAGAIN && signal_pending(current)) {
 852                                         err = -ERESTART;
 853                                         goto error;
 854                                 }
 855                                 if (nx == -EAGAIN ||
 856                                     genid != atomic_read(&flow_cache_genid)) {
 857                                         xfrm_pol_put(policy);
 858                                         goto restart;
 859                                 }
 860                                 err = nx;
 861                         }
 862                         if (err < 0)
 863                                 goto error;
 864                 }
 865                 if (nx == 0) {
 866                         /* Flow passes not transformed. */
 867                         xfrm_pol_put(policy);
 868                         return 0;
 869                 }
 870
 871                 dst = dst_orig;
 872                 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
 873
 874                 if (unlikely(err)) {
 875                         int i;
 876                         for (i=0; i<nx; i++)
 877                                 xfrm_state_put(xfrm[i]);
 878                         goto error;
 879                 }
 880
 881                 write_lock_bh(&policy->lock);
 882                 if (unlikely(policy->dead || stale_bundle(dst))) {
 883                         /* Wow! While we worked on resolving, this
 884                          * policy has gone. Retry. It is not paranoia,
 885                          * we just cannot enlist new bundle to dead object.
 886                          * We can't enlist stable bundles either.
 887                          */
 888                         write_unlock_bh(&policy->lock);
 889
 890                         xfrm_pol_put(policy);
 891                         if (dst)
 892                                 dst_free(dst);
 893                         goto restart;
 894                 }
 895                 dst->next = policy->bundles;
 896                 policy->bundles = dst;
 897                 dst_hold(dst);
 898                 write_unlock_bh(&policy->lock);
 899         }
 900         *dst_p = dst;
 901         dst_release(dst_orig);
 902         xfrm_pol_put(policy);
 903         return 0;
 904
 905 error:
 906         dst_release(dst_orig);
 907         xfrm_pol_put(policy);
 908         *dst_p = NULL;
 909         return err;
 910 }
 911 EXPORT_SYMBOL(xfrm_lookup);
 912
 913 /* When skb is transformed back to its "native" form, we have to
 914  * check policy restrictions. At the moment we make this in maximally
 915  * stupid way. Shame on me. :-) Of course, connected sockets must
 916  * have policy cached at them.
 917  */
 918
 919 static inline int
 920 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
 921               unsigned short family)
 922 {
 923         if (xfrm_state_kern(x))
 924                 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
 925         return  x->id.proto == tmpl->id.proto &&
 926                 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
 927                 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
 928                 x->props.mode == tmpl->mode &&
 929                 (tmpl->aalgos & (1<<x->props.aalgo)) &&
 930                 !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family));
 931 }
 932
 933 static inline int
 934 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
 935                unsigned short family)
 936 {
 937         int idx = start;
 938
 939         if (tmpl->optional) {
 940                 if (!tmpl->mode)
 941                         return start;
 942         } else
 943                 start = -1;
 944         for (; idx < sp->len; idx++) {
 945                 if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family))
 946                         return ++idx;
 947                 if (sp->x[idx].xvec->props.mode)
 948                         break;
 949         }
 950         return start;
 951 }
 952
 953 int
 954 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
 955 {
 956         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 957
 958         if (unlikely(afinfo == NULL))
 959                 return -EAFNOSUPPORT;
 960
 961         afinfo->decode_session(skb, fl);
 962         xfrm_policy_put_afinfo(afinfo);
 963         return 0;
 964 }
 965 EXPORT_SYMBOL(xfrm_decode_session);
 966
 967 static inline int secpath_has_tunnel(struct sec_path *sp, int k)
 968 {
 969         for (; k < sp->len; k++) {
 970                 if (sp->x[k].xvec->props.mode)
 971                         return 1;
 972         }
 973
 974         return 0;
 975 }
 976
 977 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 978                         unsigned short family)
 979 {
 980         struct xfrm_policy *pol;
 981         struct flowi fl;
 982         u8 fl_dir = policy_to_flow_dir(dir);
 983         u32 sk_sid;
 984
 985         if (xfrm_decode_session(skb, &fl, family) < 0)
 986                 return 0;
 987         nf_nat_decode_session(skb, &fl, family);
 988
 989         sk_sid = security_sk_sid(sk, &fl, fl_dir);
 990
 991         /* First, check used SA against their selectors. */
 992         if (skb->sp) {
 993                 int i;
 994
 995                 for (i=skb->sp->len-1; i>=0; i--) {
 996                         struct sec_decap_state *xvec = &(skb->sp->x[i]);
 997                         if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family))
 998                                 return 0;
 999
1000                         /* If there is a post_input processor, try running it */
1001                         if (xvec->xvec->type->post_input &&
1002                             (xvec->xvec->type->post_input)(xvec->xvec,
1003                                                            &(xvec->decap),
1004                                                            skb) != 0)
1005                                 return 0;
1006                 }
1007         }
1008
1009         pol = NULL;
1010         if (sk && sk->sk_policy[dir])
1011                 pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid);
1012
1013         if (!pol)
1014                 pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir,
1015                                         xfrm_policy_lookup);
1016
1017         if (!pol)
1018                 return !skb->sp || !secpath_has_tunnel(skb->sp, 0);
1019
1020         pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1021
1022         if (pol->action == XFRM_POLICY_ALLOW) {
1023                 struct sec_path *sp;
1024                 static struct sec_path dummy;
1025                 int i, k;
1026
1027                 if ((sp = skb->sp) == NULL)
1028                         sp = &dummy;
1029
1030                 /* For each tunnel xfrm, find the first matching tmpl.
1031                  * For each tmpl before that, find corresponding xfrm.
1032                  * Order is _important_. Later we will implement
1033                  * some barriers, but at the moment barriers
1034                  * are implied between each two transformations.
1035                  */
1036                 for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) {
1037                         k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family);
1038                         if (k < 0)
1039                                 goto reject;
1040                 }
1041
1042                 if (secpath_has_tunnel(sp, k))
1043                         goto reject;
1044
1045                 xfrm_pol_put(pol);
1046                 return 1;
1047         }
1048
1049 reject:
1050         xfrm_pol_put(pol);
1051         return 0;
1052 }
1053 EXPORT_SYMBOL(__xfrm_policy_check);
1054
1055 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1056 {
1057         struct flowi fl;
1058
1059         if (xfrm_decode_session(skb, &fl, family) < 0)
1060                 return 0;
1061
1062         return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1063 }
1064 EXPORT_SYMBOL(__xfrm_route_forward);
1065
1066 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1067 {
1068         /* If it is marked obsolete, which is how we even get here,
1069          * then we have purged it from the policy bundle list and we
1070          * did that for a good reason.
1071          */
1072         return NULL;
1073 }
1074
1075 static int stale_bundle(struct dst_entry *dst)
1076 {
1077         return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC);
1078 }
1079
1080 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1081 {
1082         while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1083                 dst->dev = &loopback_dev;
1084                 dev_hold(&loopback_dev);
1085                 dev_put(dev);
1086         }
1087 }
1088 EXPORT_SYMBOL(xfrm_dst_ifdown);
1089
1090 static void xfrm_link_failure(struct sk_buff *skb)
1091 {
1092         /* Impossible. Such dst must be popped before reaches point of failure. */
1093         return;
1094 }
1095
1096 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1097 {
1098         if (dst) {
1099                 if (dst->obsolete) {
1100                         dst_release(dst);
1101                         dst = NULL;
1102                 }
1103         }
1104         return dst;
1105 }
1106
1107 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1108 {
1109         int i;
1110         struct xfrm_policy *pol;
1111         struct dst_entry *dst, **dstp, *gc_list = NULL;
1112
1113         read_lock_bh(&xfrm_policy_lock);
1114         for (i=0; i<2*XFRM_POLICY_MAX; i++) {
1115                 for (pol = xfrm_policy_list[i]; pol; pol = pol->next) {
1116                         write_lock(&pol->lock);
1117                         dstp = &pol->bundles;
1118                         while ((dst=*dstp) != NULL) {
1119                                 if (func(dst)) {
1120                                         *dstp = dst->next;
1121                                         dst->next = gc_list;
1122                                         gc_list = dst;
1123                                 } else {
1124                                         dstp = &dst->next;
1125                                 }
1126                         }
1127                         write_unlock(&pol->lock);
1128                 }
1129         }
1130         read_unlock_bh(&xfrm_policy_lock);
1131
1132         while (gc_list) {
1133                 dst = gc_list;
1134                 gc_list = dst->next;
1135                 dst_free(dst);
1136         }
1137 }
1138
1139 static int unused_bundle(struct dst_entry *dst)
1140 {
1141         return !atomic_read(&dst->__refcnt);
1142 }
1143
1144 static void __xfrm_garbage_collect(void)
1145 {
1146         xfrm_prune_bundles(unused_bundle);
1147 }
1148
1149 int xfrm_flush_bundles(void)
1150 {
1151         xfrm_prune_bundles(stale_bundle);
1152         return 0;
1153 }
1154
1155 static int always_true(struct dst_entry *dst)
1156 {
1157         return 1;
1158 }
1159
1160 void xfrm_flush_all_bundles(void)
1161 {
1162         xfrm_prune_bundles(always_true);
1163 }
1164
1165 void xfrm_init_pmtu(struct dst_entry *dst)
1166 {
1167         do {
1168                 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1169                 u32 pmtu, route_mtu_cached;
1170
1171                 pmtu = dst_mtu(dst->child);
1172                 xdst->child_mtu_cached = pmtu;
1173
1174                 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1175
1176                 route_mtu_cached = dst_mtu(xdst->route);
1177                 xdst->route_mtu_cached = route_mtu_cached;
1178
1179                 if (pmtu > route_mtu_cached)
1180                         pmtu = route_mtu_cached;
1181
1182                 dst->metrics[RTAX_MTU-1] = pmtu;
1183         } while ((dst = dst->next));
1184 }
1185
1186 EXPORT_SYMBOL(xfrm_init_pmtu);
1187
1188 /* Check that the bundle accepts the flow and its components are
1189  * still valid.
1190  */
1191
1192 int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family)
1193 {
1194         struct dst_entry *dst = &first->u.dst;
1195         struct xfrm_dst *last;
1196         u32 mtu;
1197
1198         if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1199             (dst->dev && !netif_running(dst->dev)))
1200                 return 0;
1201
1202         last = NULL;
1203
1204         do {
1205                 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1206
1207                 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1208                         return 0;
1209                 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1210                         return 0;
1211
1212                 mtu = dst_mtu(dst->child);
1213                 if (xdst->child_mtu_cached != mtu) {
1214                         last = xdst;
1215                         xdst->child_mtu_cached = mtu;
1216                 }
1217
1218                 if (!dst_check(xdst->route, xdst->route_cookie))
1219                         return 0;
1220                 mtu = dst_mtu(xdst->route);
1221                 if (xdst->route_mtu_cached != mtu) {
1222                         last = xdst;
1223                         xdst->route_mtu_cached = mtu;
1224                 }
1225
1226                 dst = dst->child;
1227         } while (dst->xfrm);
1228
1229         if (likely(!last))
1230                 return 1;
1231
1232         mtu = last->child_mtu_cached;
1233         for (;;) {
1234                 dst = &last->u.dst;
1235
1236                 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1237                 if (mtu > last->route_mtu_cached)
1238                         mtu = last->route_mtu_cached;
1239                 dst->metrics[RTAX_MTU-1] = mtu;
1240
1241                 if (last == first)
1242                         break;
1243
1244                 last = last->u.next;
1245                 last->child_mtu_cached = mtu;
1246         }
1247
1248         return 1;
1249 }
1250
1251 EXPORT_SYMBOL(xfrm_bundle_ok);
1252
1253 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1254 {
1255         int err = 0;
1256         if (unlikely(afinfo == NULL))
1257                 return -EINVAL;
1258         if (unlikely(afinfo->family >= NPROTO))
1259                 return -EAFNOSUPPORT;
1260         write_lock(&xfrm_policy_afinfo_lock);
1261         if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1262                 err = -ENOBUFS;
1263         else {
1264                 struct dst_ops *dst_ops = afinfo->dst_ops;
1265                 if (likely(dst_ops->kmem_cachep == NULL))
1266                         dst_ops->kmem_cachep = xfrm_dst_cache;
1267                 if (likely(dst_ops->check == NULL))
1268                         dst_ops->check = xfrm_dst_check;
1269                 if (likely(dst_ops->negative_advice == NULL))
1270                         dst_ops->negative_advice = xfrm_negative_advice;
1271                 if (likely(dst_ops->link_failure == NULL))
1272                         dst_ops->link_failure = xfrm_link_failure;
1273                 if (likely(afinfo->garbage_collect == NULL))
1274                         afinfo->garbage_collect = __xfrm_garbage_collect;
1275                 xfrm_policy_afinfo[afinfo->family] = afinfo;
1276         }
1277         write_unlock(&xfrm_policy_afinfo_lock);
1278         return err;
1279 }
1280 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
1281
1282 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
1283 {
1284         int err = 0;
1285         if (unlikely(afinfo == NULL))
1286                 return -EINVAL;
1287         if (unlikely(afinfo->family >= NPROTO))
1288                 return -EAFNOSUPPORT;
1289         write_lock(&xfrm_policy_afinfo_lock);
1290         if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
1291                 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
1292                         err = -EINVAL;
1293                 else {
1294                         struct dst_ops *dst_ops = afinfo->dst_ops;
1295                         xfrm_policy_afinfo[afinfo->family] = NULL;
1296                         dst_ops->kmem_cachep = NULL;
1297                         dst_ops->check = NULL;
1298                         dst_ops->negative_advice = NULL;
1299                         dst_ops->link_failure = NULL;
1300                         afinfo->garbage_collect = NULL;
1301                 }
1302         }
1303         write_unlock(&xfrm_policy_afinfo_lock);
1304         return err;
1305 }
1306 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
1307
1308 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
1309 {
1310         struct xfrm_policy_afinfo *afinfo;
1311         if (unlikely(family >= NPROTO))
1312                 return NULL;
1313         read_lock(&xfrm_policy_afinfo_lock);
1314         afinfo = xfrm_policy_afinfo[family];
1315         if (likely(afinfo != NULL))
1316                 read_lock(&afinfo->lock);
1317         read_unlock(&xfrm_policy_afinfo_lock);
1318         return afinfo;
1319 }
1320
1321 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
1322 {
1323         if (unlikely(afinfo == NULL))
1324                 return;
1325         read_unlock(&afinfo->lock);
1326 }
1327
1328 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
1329 {
1330         switch (event) {
1331         case NETDEV_DOWN:
1332                 xfrm_flush_bundles();
1333         }
1334         return NOTIFY_DONE;
1335 }
1336
1337 static struct notifier_block xfrm_dev_notifier = {
1338         xfrm_dev_event,
1339         NULL,
1340         0
1341 };
1342
1343 static void __init xfrm_policy_init(void)
1344 {
1345         xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1346                                            sizeof(struct xfrm_dst),
1347                                            0, SLAB_HWCACHE_ALIGN,
1348                                            NULL, NULL);
1349         if (!xfrm_dst_cache)
1350                 panic("XFRM: failed to allocate xfrm_dst_cache\n");
1351
1352         INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL);
1353         register_netdevice_notifier(&xfrm_dev_notifier);
1354 }
1355
1356 void __init xfrm_init(void)
1357 {
1358         xfrm_state_init();
1359         xfrm_policy_init();
1360         xfrm_input_init();
1361 }
1362