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         if (!policy->dead)
 252                 BUG();
 253
 254         if (policy->bundles)
 255                 BUG();
 256
 257         if (del_timer(&policy->timer))
 258                 BUG();
 259
 260         security_xfrm_policy_free(policy);
 261         kfree(policy);
 262 }
 263 EXPORT_SYMBOL(__xfrm_policy_destroy);
 264
 265 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
 266 {
 267         struct dst_entry *dst;
 268
 269         while ((dst = policy->bundles) != NULL) {
 270                 policy->bundles = dst->next;
 271                 dst_free(dst);
 272         }
 273
 274         if (del_timer(&policy->timer))
 275                 atomic_dec(&policy->refcnt);
 276
 277         if (atomic_read(&policy->refcnt) > 1)
 278                 flow_cache_flush();
 279
 280         xfrm_pol_put(policy);
 281 }
 282
 283 static void xfrm_policy_gc_task(void *data)
 284 {
 285         struct xfrm_policy *policy;
 286         struct list_head *entry, *tmp;
 287         struct list_head gc_list = LIST_HEAD_INIT(gc_list);
 288
 289         spin_lock_bh(&xfrm_policy_gc_lock);
 290         list_splice_init(&xfrm_policy_gc_list, &gc_list);
 291         spin_unlock_bh(&xfrm_policy_gc_lock);
 292
 293         list_for_each_safe(entry, tmp, &gc_list) {
 294                 policy = list_entry(entry, struct xfrm_policy, list);
 295                 xfrm_policy_gc_kill(policy);
 296         }
 297 }
 298
 299 /* Rule must be locked. Release descentant resources, announce
 300  * entry dead. The rule must be unlinked from lists to the moment.
 301  */
 302
 303 static void xfrm_policy_kill(struct xfrm_policy *policy)
 304 {
 305         int dead;
 306
 307         write_lock_bh(&policy->lock);
 308         dead = policy->dead;
 309         policy->dead = 1;
 310         write_unlock_bh(&policy->lock);
 311
 312         if (unlikely(dead)) {
 313                 WARN_ON(1);
 314                 return;
 315         }
 316
 317         spin_lock(&xfrm_policy_gc_lock);
 318         list_add(&policy->list, &xfrm_policy_gc_list);
 319         spin_unlock(&xfrm_policy_gc_lock);
 320
 321         schedule_work(&xfrm_policy_gc_work);
 322 }
 323
 324 /* Generate new index... KAME seems to generate them ordered by cost
 325  * of an absolute inpredictability of ordering of rules. This will not pass. */
 326 static u32 xfrm_gen_index(int dir)
 327 {
 328         u32 idx;
 329         struct xfrm_policy *p;
 330         static u32 idx_generator;
 331
 332         for (;;) {
 333                 idx = (idx_generator | dir);
 334                 idx_generator += 8;
 335                 if (idx == 0)
 336                         idx = 8;
 337                 for (p = xfrm_policy_list[dir]; p; p = p->next) {
 338                         if (p->index == idx)
 339                                 break;
 340                 }
 341                 if (!p)
 342                         return idx;
 343         }
 344 }
 345
 346 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
 347 {
 348         struct xfrm_policy *pol, **p;
 349         struct xfrm_policy *delpol = NULL;
 350         struct xfrm_policy **newpos = NULL;
 351         struct dst_entry *gc_list;
 352
 353         write_lock_bh(&xfrm_policy_lock);
 354         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) {
 355                 if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 &&
 356                     xfrm_sec_ctx_match(pol->security, policy->security)) {
 357                         if (excl) {
 358                                 write_unlock_bh(&xfrm_policy_lock);
 359                                 return -EEXIST;
 360                         }
 361                         *p = pol->next;
 362                         delpol = pol;
 363                         if (policy->priority > pol->priority)
 364                                 continue;
 365                 } else if (policy->priority >= pol->priority) {
 366                         p = &pol->next;
 367                         continue;
 368                 }
 369                 if (!newpos)
 370                         newpos = p;
 371                 if (delpol)
 372                         break;
 373                 p = &pol->next;
 374         }
 375         if (newpos)
 376                 p = newpos;
 377         xfrm_pol_hold(policy);
 378         policy->next = *p;
 379         *p = policy;
 380         atomic_inc(&flow_cache_genid);
 381         policy->index = delpol ? delpol->index : xfrm_gen_index(dir);
 382         policy->curlft.add_time = (unsigned long)xtime.tv_sec;
 383         policy->curlft.use_time = 0;
 384         if (!mod_timer(&policy->timer, jiffies + HZ))
 385                 xfrm_pol_hold(policy);
 386         write_unlock_bh(&xfrm_policy_lock);
 387
 388         if (delpol)
 389                 xfrm_policy_kill(delpol);
 390
 391         read_lock_bh(&xfrm_policy_lock);
 392         gc_list = NULL;
 393         for (policy = policy->next; policy; policy = policy->next) {
 394                 struct dst_entry *dst;
 395
 396                 write_lock(&policy->lock);
 397                 dst = policy->bundles;
 398                 if (dst) {
 399                         struct dst_entry *tail = dst;
 400                         while (tail->next)
 401                                 tail = tail->next;
 402                         tail->next = gc_list;
 403                         gc_list = dst;
 404
 405                         policy->bundles = NULL;
 406                 }
 407                 write_unlock(&policy->lock);
 408         }
 409         read_unlock_bh(&xfrm_policy_lock);
 410
 411         while (gc_list) {
 412                 struct dst_entry *dst = gc_list;
 413
 414                 gc_list = dst->next;
 415                 dst_free(dst);
 416         }
 417
 418         return 0;
 419 }
 420 EXPORT_SYMBOL(xfrm_policy_insert);
 421
 422 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
 423                                           struct xfrm_sec_ctx *ctx, int delete)
 424 {
 425         struct xfrm_policy *pol, **p;
 426
 427         write_lock_bh(&xfrm_policy_lock);
 428         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
 429                 if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) &&
 430                     (xfrm_sec_ctx_match(ctx, pol->security))) {
 431                         xfrm_pol_hold(pol);
 432                         if (delete)
 433                                 *p = pol->next;
 434                         break;
 435                 }
 436         }
 437         write_unlock_bh(&xfrm_policy_lock);
 438
 439         if (pol && delete) {
 440                 atomic_inc(&flow_cache_genid);
 441                 xfrm_policy_kill(pol);
 442         }
 443         return pol;
 444 }
 445 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
 446
 447 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete)
 448 {
 449         struct xfrm_policy *pol, **p;
 450
 451         write_lock_bh(&xfrm_policy_lock);
 452         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
 453                 if (pol->index == id) {
 454                         xfrm_pol_hold(pol);
 455                         if (delete)
 456                                 *p = pol->next;
 457                         break;
 458                 }
 459         }
 460         write_unlock_bh(&xfrm_policy_lock);
 461
 462         if (pol && delete) {
 463                 atomic_inc(&flow_cache_genid);
 464                 xfrm_policy_kill(pol);
 465         }
 466         return pol;
 467 }
 468 EXPORT_SYMBOL(xfrm_policy_byid);
 469
 470 void xfrm_policy_flush(void)
 471 {
 472         struct xfrm_policy *xp;
 473         int dir;
 474
 475         write_lock_bh(&xfrm_policy_lock);
 476         for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
 477                 while ((xp = xfrm_policy_list[dir]) != NULL) {
 478                         xfrm_policy_list[dir] = xp->next;
 479                         write_unlock_bh(&xfrm_policy_lock);
 480
 481                         xfrm_policy_kill(xp);
 482
 483                         write_lock_bh(&xfrm_policy_lock);
 484                 }
 485         }
 486         atomic_inc(&flow_cache_genid);
 487         write_unlock_bh(&xfrm_policy_lock);
 488 }
 489 EXPORT_SYMBOL(xfrm_policy_flush);
 490
 491 int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*),
 492                      void *data)
 493 {
 494         struct xfrm_policy *xp;
 495         int dir;
 496         int count = 0;
 497         int error = 0;
 498
 499         read_lock_bh(&xfrm_policy_lock);
 500         for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
 501                 for (xp = xfrm_policy_list[dir]; xp; xp = xp->next)
 502                         count++;
 503         }
 504
 505         if (count == 0) {
 506                 error = -ENOENT;
 507                 goto out;
 508         }
 509
 510         for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
 511                 for (xp = xfrm_policy_list[dir]; xp; xp = xp->next) {
 512                         error = func(xp, dir%XFRM_POLICY_MAX, --count, data);
 513                         if (error)
 514                                 goto out;
 515                 }
 516         }
 517
 518 out:
 519         read_unlock_bh(&xfrm_policy_lock);
 520         return error;
 521 }
 522 EXPORT_SYMBOL(xfrm_policy_walk);
 523
 524 /* Find policy to apply to this flow. */
 525
 526 static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir,
 527                                void **objp, atomic_t **obj_refp)
 528 {
 529         struct xfrm_policy *pol;
 530
 531         read_lock_bh(&xfrm_policy_lock);
 532         for (pol = xfrm_policy_list[dir]; pol; pol = pol->next) {
 533                 struct xfrm_selector *sel = &pol->selector;
 534                 int match;
 535
 536                 if (pol->family != family)
 537                         continue;
 538
 539                 match = xfrm_selector_match(sel, fl, family);
 540
 541                 if (match) {
 542                         if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) {
 543                                 xfrm_pol_hold(pol);
 544                                 break;
 545                         }
 546                 }
 547         }
 548         read_unlock_bh(&xfrm_policy_lock);
 549         if ((*objp = (void *) pol) != NULL)
 550                 *obj_refp = &pol->refcnt;
 551 }
 552
 553 static inline int policy_to_flow_dir(int dir)
 554 {
 555         if (XFRM_POLICY_IN == FLOW_DIR_IN &&
 556             XFRM_POLICY_OUT == FLOW_DIR_OUT &&
 557             XFRM_POLICY_FWD == FLOW_DIR_FWD)
 558                 return dir;
 559         switch (dir) {
 560         default:
 561         case XFRM_POLICY_IN:
 562                 return FLOW_DIR_IN;
 563         case XFRM_POLICY_OUT:
 564                 return FLOW_DIR_OUT;
 565         case XFRM_POLICY_FWD:
 566                 return FLOW_DIR_FWD;
 567         };
 568 }
 569
 570 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid)
 571 {
 572         struct xfrm_policy *pol;
 573
 574         read_lock_bh(&xfrm_policy_lock);
 575         if ((pol = sk->sk_policy[dir]) != NULL) {
 576                 int match = xfrm_selector_match(&pol->selector, fl,
 577                                                 sk->sk_family);
 578                 int err = 0;
 579
 580                 if (match)
 581                   err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir));
 582
 583                 if (match && !err)
 584                         xfrm_pol_hold(pol);
 585                 else
 586                         pol = NULL;
 587         }
 588         read_unlock_bh(&xfrm_policy_lock);
 589         return pol;
 590 }
 591
 592 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
 593 {
 594         pol->next = xfrm_policy_list[dir];
 595         xfrm_policy_list[dir] = pol;
 596         xfrm_pol_hold(pol);
 597 }
 598
 599 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
 600                                                 int dir)
 601 {
 602         struct xfrm_policy **polp;
 603
 604         for (polp = &xfrm_policy_list[dir];
 605              *polp != NULL; polp = &(*polp)->next) {
 606                 if (*polp == pol) {
 607                         *polp = pol->next;
 608                         return pol;
 609                 }
 610         }
 611         return NULL;
 612 }
 613
 614 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
 615 {
 616         write_lock_bh(&xfrm_policy_lock);
 617         pol = __xfrm_policy_unlink(pol, dir);
 618         write_unlock_bh(&xfrm_policy_lock);
 619         if (pol) {
 620                 if (dir < XFRM_POLICY_MAX)
 621                         atomic_inc(&flow_cache_genid);
 622                 xfrm_policy_kill(pol);
 623                 return 0;
 624         }
 625         return -ENOENT;
 626 }
 627
 628 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
 629 {
 630         struct xfrm_policy *old_pol;
 631
 632         write_lock_bh(&xfrm_policy_lock);
 633         old_pol = sk->sk_policy[dir];
 634         sk->sk_policy[dir] = pol;
 635         if (pol) {
 636                 pol->curlft.add_time = (unsigned long)xtime.tv_sec;
 637                 pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir);
 638                 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
 639         }
 640         if (old_pol)
 641                 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
 642         write_unlock_bh(&xfrm_policy_lock);
 643
 644         if (old_pol) {
 645                 xfrm_policy_kill(old_pol);
 646         }
 647         return 0;
 648 }
 649
 650 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
 651 {
 652         struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
 653
 654         if (newp) {
 655                 newp->selector = old->selector;
 656                 if (security_xfrm_policy_clone(old, newp)) {
 657                         kfree(newp);
 658                         return NULL;  /* ENOMEM */
 659                 }
 660                 newp->lft = old->lft;
 661                 newp->curlft = old->curlft;
 662                 newp->action = old->action;
 663                 newp->flags = old->flags;
 664                 newp->xfrm_nr = old->xfrm_nr;
 665                 newp->index = old->index;
 666                 memcpy(newp->xfrm_vec, old->xfrm_vec,
 667                        newp->xfrm_nr*sizeof(struct xfrm_tmpl));
 668                 write_lock_bh(&xfrm_policy_lock);
 669                 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
 670                 write_unlock_bh(&xfrm_policy_lock);
 671                 xfrm_pol_put(newp);
 672         }
 673         return newp;
 674 }
 675
 676 int __xfrm_sk_clone_policy(struct sock *sk)
 677 {
 678         struct xfrm_policy *p0 = sk->sk_policy[0],
 679                            *p1 = sk->sk_policy[1];
 680
 681         sk->sk_policy[0] = sk->sk_policy[1] = NULL;
 682         if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
 683                 return -ENOMEM;
 684         if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
 685                 return -ENOMEM;
 686         return 0;
 687 }
 688
 689 /* Resolve list of templates for the flow, given policy. */
 690
 691 static int
 692 xfrm_tmpl_resolve(struct xfrm_policy *policy, struct flowi *fl,
 693                   struct xfrm_state **xfrm,
 694                   unsigned short family)
 695 {
 696         int nx;
 697         int i, error;
 698         xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
 699         xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
 700
 701         for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
 702                 struct xfrm_state *x;
 703                 xfrm_address_t *remote = daddr;
 704                 xfrm_address_t *local  = saddr;
 705                 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
 706
 707                 if (tmpl->mode) {
 708                         remote = &tmpl->id.daddr;
 709                         local = &tmpl->saddr;
 710                 }
 711
 712                 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
 713
 714                 if (x && x->km.state == XFRM_STATE_VALID) {
 715                         xfrm[nx++] = x;
 716                         daddr = remote;
 717                         saddr = local;
 718                         continue;
 719                 }
 720                 if (x) {
 721                         error = (x->km.state == XFRM_STATE_ERROR ?
 722                                  -EINVAL : -EAGAIN);
 723                         xfrm_state_put(x);
 724                 }
 725
 726                 if (!tmpl->optional)
 727                         goto fail;
 728         }
 729         return nx;
 730
 731 fail:
 732         for (nx--; nx>=0; nx--)
 733                 xfrm_state_put(xfrm[nx]);
 734         return error;
 735 }
 736
 737 /* Check that the bundle accepts the flow and its components are
 738  * still valid.
 739  */
 740
 741 static struct dst_entry *
 742 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
 743 {
 744         struct dst_entry *x;
 745         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 746         if (unlikely(afinfo == NULL))
 747                 return ERR_PTR(-EINVAL);
 748         x = afinfo->find_bundle(fl, policy);
 749         xfrm_policy_put_afinfo(afinfo);
 750         return x;
 751 }
 752
 753 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
 754  * all the metrics... Shortly, bundle a bundle.
 755  */
 756
 757 static int
 758 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
 759                    struct flowi *fl, struct dst_entry **dst_p,
 760                    unsigned short family)
 761 {
 762         int err;
 763         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 764         if (unlikely(afinfo == NULL))
 765                 return -EINVAL;
 766         err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
 767         xfrm_policy_put_afinfo(afinfo);
 768         return err;
 769 }
 770
 771
 772 static int stale_bundle(struct dst_entry *dst);
 773
 774 /* Main function: finds/creates a bundle for given flow.
 775  *
 776  * At the moment we eat a raw IP route. Mostly to speed up lookups
 777  * on interfaces with disabled IPsec.
 778  */
 779 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
 780                 struct sock *sk, int flags)
 781 {
 782         struct xfrm_policy *policy;
 783         struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
 784         struct dst_entry *dst, *dst_orig = *dst_p;
 785         int nx = 0;
 786         int err;
 787         u32 genid;
 788         u16 family = dst_orig->ops->family;
 789         u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
 790         u32 sk_sid = security_sk_sid(sk, fl, dir);
 791 restart:
 792         genid = atomic_read(&flow_cache_genid);
 793         policy = NULL;
 794         if (sk && sk->sk_policy[1])
 795                 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid);
 796
 797         if (!policy) {
 798                 /* To accelerate a bit...  */
 799                 if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT])
 800                         return 0;
 801
 802                 policy = flow_cache_lookup(fl, sk_sid, family, dir,
 803                                            xfrm_policy_lookup);
 804         }
 805
 806         if (!policy)
 807                 return 0;
 808
 809         policy->curlft.use_time = (unsigned long)xtime.tv_sec;
 810
 811         switch (policy->action) {
 812         case XFRM_POLICY_BLOCK:
 813                 /* Prohibit the flow */
 814                 err = -EPERM;
 815                 goto error;
 816
 817         case XFRM_POLICY_ALLOW:
 818                 if (policy->xfrm_nr == 0) {
 819                         /* Flow passes not transformed. */
 820                         xfrm_pol_put(policy);
 821                         return 0;
 822                 }
 823
 824                 /* Try to find matching bundle.
 825                  *
 826                  * LATER: help from flow cache. It is optional, this
 827                  * is required only for output policy.
 828                  */
 829                 dst = xfrm_find_bundle(fl, policy, family);
 830                 if (IS_ERR(dst)) {
 831                         err = PTR_ERR(dst);
 832                         goto error;
 833                 }
 834
 835                 if (dst)
 836                         break;
 837
 838                 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
 839
 840                 if (unlikely(nx<0)) {
 841                         err = nx;
 842                         if (err == -EAGAIN && flags) {
 843                                 DECLARE_WAITQUEUE(wait, current);
 844
 845                                 add_wait_queue(&km_waitq, &wait);
 846                                 set_current_state(TASK_INTERRUPTIBLE);
 847                                 schedule();
 848                                 set_current_state(TASK_RUNNING);
 849                                 remove_wait_queue(&km_waitq, &wait);
 850
 851                                 nx = xfrm_tmpl_resolve(policy, fl, xfrm, family);
 852
 853                                 if (nx == -EAGAIN && signal_pending(current)) {
 854                                         err = -ERESTART;
 855                                         goto error;
 856                                 }
 857                                 if (nx == -EAGAIN ||
 858                                     genid != atomic_read(&flow_cache_genid)) {
 859                                         xfrm_pol_put(policy);
 860                                         goto restart;
 861                                 }
 862                                 err = nx;
 863                         }
 864                         if (err < 0)
 865                                 goto error;
 866                 }
 867                 if (nx == 0) {
 868                         /* Flow passes not transformed. */
 869                         xfrm_pol_put(policy);
 870                         return 0;
 871                 }
 872
 873                 dst = dst_orig;
 874                 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
 875
 876                 if (unlikely(err)) {
 877                         int i;
 878                         for (i=0; i<nx; i++)
 879                                 xfrm_state_put(xfrm[i]);
 880                         goto error;
 881                 }
 882
 883                 write_lock_bh(&policy->lock);
 884                 if (unlikely(policy->dead || stale_bundle(dst))) {
 885                         /* Wow! While we worked on resolving, this
 886                          * policy has gone. Retry. It is not paranoia,
 887                          * we just cannot enlist new bundle to dead object.
 888                          * We can't enlist stable bundles either.
 889                          */
 890                         write_unlock_bh(&policy->lock);
 891
 892                         xfrm_pol_put(policy);
 893                         if (dst)
 894                                 dst_free(dst);
 895                         goto restart;
 896                 }
 897                 dst->next = policy->bundles;
 898                 policy->bundles = dst;
 899                 dst_hold(dst);
 900                 write_unlock_bh(&policy->lock);
 901         }
 902         *dst_p = dst;
 903         dst_release(dst_orig);
 904         xfrm_pol_put(policy);
 905         return 0;
 906
 907 error:
 908         dst_release(dst_orig);
 909         xfrm_pol_put(policy);
 910         *dst_p = NULL;
 911         return err;
 912 }
 913 EXPORT_SYMBOL(xfrm_lookup);
 914
 915 /* When skb is transformed back to its "native" form, we have to
 916  * check policy restrictions. At the moment we make this in maximally
 917  * stupid way. Shame on me. :-) Of course, connected sockets must
 918  * have policy cached at them.
 919  */
 920
 921 static inline int
 922 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
 923               unsigned short family)
 924 {
 925         if (xfrm_state_kern(x))
 926                 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
 927         return  x->id.proto == tmpl->id.proto &&
 928                 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
 929                 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
 930                 x->props.mode == tmpl->mode &&
 931                 (tmpl->aalgos & (1<<x->props.aalgo)) &&
 932                 !(x->props.mode && xfrm_state_addr_cmp(tmpl, x, family));
 933 }
 934
 935 static inline int
 936 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
 937                unsigned short family)
 938 {
 939         int idx = start;
 940
 941         if (tmpl->optional) {
 942                 if (!tmpl->mode)
 943                         return start;
 944         } else
 945                 start = -1;
 946         for (; idx < sp->len; idx++) {
 947                 if (xfrm_state_ok(tmpl, sp->x[idx].xvec, family))
 948                         return ++idx;
 949                 if (sp->x[idx].xvec->props.mode)
 950                         break;
 951         }
 952         return start;
 953 }
 954
 955 int
 956 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
 957 {
 958         struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
 959
 960         if (unlikely(afinfo == NULL))
 961                 return -EAFNOSUPPORT;
 962
 963         afinfo->decode_session(skb, fl);
 964         xfrm_policy_put_afinfo(afinfo);
 965         return 0;
 966 }
 967 EXPORT_SYMBOL(xfrm_decode_session);
 968
 969 static inline int secpath_has_tunnel(struct sec_path *sp, int k)
 970 {
 971         for (; k < sp->len; k++) {
 972                 if (sp->x[k].xvec->props.mode)
 973                         return 1;
 974         }
 975
 976         return 0;
 977 }
 978
 979 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 980                         unsigned short family)
 981 {
 982         struct xfrm_policy *pol;
 983         struct flowi fl;
 984         u8 fl_dir = policy_to_flow_dir(dir);
 985         u32 sk_sid;
 986
 987         if (xfrm_decode_session(skb, &fl, family) < 0)
 988                 return 0;
 989         nf_nat_decode_session(skb, &fl, family);
 990
 991         sk_sid = security_sk_sid(sk, &fl, fl_dir);
 992
 993         /* First, check used SA against their selectors. */
 994         if (skb->sp) {
 995                 int i;
 996
 997                 for (i=skb->sp->len-1; i>=0; i--) {
 998                         struct sec_decap_state *xvec = &(skb->sp->x[i]);
 999                         if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family))
1000                                 return 0;
1001
1002                         /* If there is a post_input processor, try running it */
1003                         if (xvec->xvec->type->post_input &&
1004                             (xvec->xvec->type->post_input)(xvec->xvec,
1005                                                            &(xvec->decap),
1006                                                            skb) != 0)
1007                                 return 0;
1008                 }
1009         }
1010
1011         pol = NULL;
1012         if (sk && sk->sk_policy[dir])
1013                 pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid);
1014
1015         if (!pol)
1016                 pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir,
1017                                         xfrm_policy_lookup);
1018
1019         if (!pol)
1020                 return !skb->sp || !secpath_has_tunnel(skb->sp, 0);
1021
1022         pol->curlft.use_time = (unsigned long)xtime.tv_sec;
1023
1024         if (pol->action == XFRM_POLICY_ALLOW) {
1025                 struct sec_path *sp;
1026                 static struct sec_path dummy;
1027                 int i, k;
1028
1029                 if ((sp = skb->sp) == NULL)
1030                         sp = &dummy;
1031
1032                 /* For each tunnel xfrm, find the first matching tmpl.
1033                  * For each tmpl before that, find corresponding xfrm.
1034                  * Order is _important_. Later we will implement
1035                  * some barriers, but at the moment barriers
1036                  * are implied between each two transformations.
1037                  */
1038                 for (i = pol->xfrm_nr-1, k = 0; i >= 0; i--) {
1039                         k = xfrm_policy_ok(pol->xfrm_vec+i, sp, k, family);
1040                         if (k < 0)
1041                                 goto reject;
1042                 }
1043
1044                 if (secpath_has_tunnel(sp, k))
1045                         goto reject;
1046
1047                 xfrm_pol_put(pol);
1048                 return 1;
1049         }
1050
1051 reject:
1052         xfrm_pol_put(pol);
1053         return 0;
1054 }
1055 EXPORT_SYMBOL(__xfrm_policy_check);
1056
1057 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1058 {
1059         struct flowi fl;
1060
1061         if (xfrm_decode_session(skb, &fl, family) < 0)
1062                 return 0;
1063
1064         return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1065 }
1066 EXPORT_SYMBOL(__xfrm_route_forward);
1067
1068 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1069 {
1070         /* If it is marked obsolete, which is how we even get here,
1071          * then we have purged it from the policy bundle list and we
1072          * did that for a good reason.
1073          */
1074         return NULL;
1075 }
1076
1077 static int stale_bundle(struct dst_entry *dst)
1078 {
1079         return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC);
1080 }
1081
1082 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1083 {
1084         while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1085                 dst->dev = &loopback_dev;
1086                 dev_hold(&loopback_dev);
1087                 dev_put(dev);
1088         }
1089 }
1090 EXPORT_SYMBOL(xfrm_dst_ifdown);
1091
1092 static void xfrm_link_failure(struct sk_buff *skb)
1093 {
1094         /* Impossible. Such dst must be popped before reaches point of failure. */
1095         return;
1096 }
1097
1098 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1099 {
1100         if (dst) {
1101                 if (dst->obsolete) {
1102                         dst_release(dst);
1103                         dst = NULL;
1104                 }
1105         }
1106         return dst;
1107 }
1108
1109 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1110 {
1111         int i;
1112         struct xfrm_policy *pol;
1113         struct dst_entry *dst, **dstp, *gc_list = NULL;
1114
1115         read_lock_bh(&xfrm_policy_lock);
1116         for (i=0; i<2*XFRM_POLICY_MAX; i++) {
1117                 for (pol = xfrm_policy_list[i]; pol; pol = pol->next) {
1118                         write_lock(&pol->lock);
1119                         dstp = &pol->bundles;
1120                         while ((dst=*dstp) != NULL) {
1121                                 if (func(dst)) {
1122                                         *dstp = dst->next;
1123                                         dst->next = gc_list;
1124                                         gc_list = dst;
1125                                 } else {
1126                                         dstp = &dst->next;
1127                                 }
1128                         }
1129                         write_unlock(&pol->lock);
1130                 }
1131         }
1132         read_unlock_bh(&xfrm_policy_lock);
1133
1134         while (gc_list) {
1135                 dst = gc_list;
1136                 gc_list = dst->next;
1137                 dst_free(dst);
1138         }
1139 }
1140
1141 static int unused_bundle(struct dst_entry *dst)
1142 {
1143         return !atomic_read(&dst->__refcnt);
1144 }
1145
1146 static void __xfrm_garbage_collect(void)
1147 {
1148         xfrm_prune_bundles(unused_bundle);
1149 }
1150
1151 int xfrm_flush_bundles(void)
1152 {
1153         xfrm_prune_bundles(stale_bundle);
1154         return 0;
1155 }
1156
1157 static int always_true(struct dst_entry *dst)
1158 {
1159         return 1;
1160 }
1161
1162 void xfrm_flush_all_bundles(void)
1163 {
1164         xfrm_prune_bundles(always_true);
1165 }
1166
1167 void xfrm_init_pmtu(struct dst_entry *dst)
1168 {
1169         do {
1170                 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1171                 u32 pmtu, route_mtu_cached;
1172
1173                 pmtu = dst_mtu(dst->child);
1174                 xdst->child_mtu_cached = pmtu;
1175
1176                 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1177
1178                 route_mtu_cached = dst_mtu(xdst->route);
1179                 xdst->route_mtu_cached = route_mtu_cached;
1180
1181                 if (pmtu > route_mtu_cached)
1182                         pmtu = route_mtu_cached;
1183
1184                 dst->metrics[RTAX_MTU-1] = pmtu;
1185         } while ((dst = dst->next));
1186 }
1187
1188 EXPORT_SYMBOL(xfrm_init_pmtu);
1189
1190 /* Check that the bundle accepts the flow and its components are
1191  * still valid.
1192  */
1193
1194 int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family)
1195 {
1196         struct dst_entry *dst = &first->u.dst;
1197         struct xfrm_dst *last;
1198         u32 mtu;
1199
1200         if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1201             (dst->dev && !netif_running(dst->dev)))
1202                 return 0;
1203
1204         last = NULL;
1205
1206         do {
1207                 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1208
1209                 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1210                         return 0;
1211                 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1212                         return 0;
1213
1214                 mtu = dst_mtu(dst->child);
1215                 if (xdst->child_mtu_cached != mtu) {
1216                         last = xdst;
1217                         xdst->child_mtu_cached = mtu;
1218                 }
1219
1220                 if (!dst_check(xdst->route, xdst->route_cookie))
1221                         return 0;
1222                 mtu = dst_mtu(xdst->route);
1223                 if (xdst->route_mtu_cached != mtu) {
1224                         last = xdst;
1225                         xdst->route_mtu_cached = mtu;
1226                 }
1227
1228                 dst = dst->child;
1229         } while (dst->xfrm);
1230
1231         if (likely(!last))
1232                 return 1;
1233
1234         mtu = last->child_mtu_cached;
1235         for (;;) {
1236                 dst = &last->u.dst;
1237
1238                 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1239                 if (mtu > last->route_mtu_cached)
1240                         mtu = last->route_mtu_cached;
1241                 dst->metrics[RTAX_MTU-1] = mtu;
1242
1243                 if (last == first)
1244                         break;
1245
1246                 last = last->u.next;
1247                 last->child_mtu_cached = mtu;
1248         }
1249
1250         return 1;
1251 }
1252
1253 EXPORT_SYMBOL(xfrm_bundle_ok);
1254
1255 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1256 {
1257         int err = 0;
1258         if (unlikely(afinfo == NULL))
1259                 return -EINVAL;
1260         if (unlikely(afinfo->family >= NPROTO))
1261                 return -EAFNOSUPPORT;
1262         write_lock(&xfrm_policy_afinfo_lock);
1263         if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1264                 err = -ENOBUFS;
1265         else {
1266                 struct dst_ops *dst_ops = afinfo->dst_ops;
1267                 if (likely(dst_ops->kmem_cachep == NULL))
1268                         dst_ops->kmem_cachep = xfrm_dst_cache;
1269                 if (likely(dst_ops->check == NULL))
1270                         dst_ops->check = xfrm_dst_check;
1271                 if (likely(dst_ops->negative_advice == NULL))
1272                         dst_ops->negative_advice = xfrm_negative_advice;
1273                 if (likely(dst_ops->link_failure == NULL))
1274                         dst_ops->link_failure = xfrm_link_failure;
1275                 if (likely(afinfo->garbage_collect == NULL))
1276                         afinfo->garbage_collect = __xfrm_garbage_collect;
1277                 xfrm_policy_afinfo[afinfo->family] = afinfo;
1278         }
1279         write_unlock(&xfrm_policy_afinfo_lock);
1280         return err;
1281 }
1282 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
1283
1284 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
1285 {
1286         int err = 0;
1287         if (unlikely(afinfo == NULL))
1288                 return -EINVAL;
1289         if (unlikely(afinfo->family >= NPROTO))
1290                 return -EAFNOSUPPORT;
1291         write_lock(&xfrm_policy_afinfo_lock);
1292         if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
1293                 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
1294                         err = -EINVAL;
1295                 else {
1296                         struct dst_ops *dst_ops = afinfo->dst_ops;
1297                         xfrm_policy_afinfo[afinfo->family] = NULL;
1298                         dst_ops->kmem_cachep = NULL;
1299                         dst_ops->check = NULL;
1300                         dst_ops->negative_advice = NULL;
1301                         dst_ops->link_failure = NULL;
1302                         afinfo->garbage_collect = NULL;
1303                 }
1304         }
1305         write_unlock(&xfrm_policy_afinfo_lock);
1306         return err;
1307 }
1308 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
1309
1310 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
1311 {
1312         struct xfrm_policy_afinfo *afinfo;
1313         if (unlikely(family >= NPROTO))
1314                 return NULL;
1315         read_lock(&xfrm_policy_afinfo_lock);
1316         afinfo = xfrm_policy_afinfo[family];
1317         if (likely(afinfo != NULL))
1318                 read_lock(&afinfo->lock);
1319         read_unlock(&xfrm_policy_afinfo_lock);
1320         return afinfo;
1321 }
1322
1323 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
1324 {
1325         if (unlikely(afinfo == NULL))
1326                 return;
1327         read_unlock(&afinfo->lock);
1328 }
1329
1330 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
1331 {
1332         switch (event) {
1333         case NETDEV_DOWN:
1334                 xfrm_flush_bundles();
1335         }
1336         return NOTIFY_DONE;
1337 }
1338
1339 static struct notifier_block xfrm_dev_notifier = {
1340         xfrm_dev_event,
1341         NULL,
1342         0
1343 };
1344
1345 static void __init xfrm_policy_init(void)
1346 {
1347         xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1348                                            sizeof(struct xfrm_dst),
1349                                            0, SLAB_HWCACHE_ALIGN,
1350                                            NULL, NULL);
1351         if (!xfrm_dst_cache)
1352                 panic("XFRM: failed to allocate xfrm_dst_cache\n");
1353
1354         INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL);
1355         register_netdevice_notifier(&xfrm_dev_notifier);
1356 }
1357
1358 void __init xfrm_init(void)
1359 {
1360         xfrm_state_init();
1361         xfrm_policy_init();
1362         xfrm_input_init();
1363 }
1364