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