SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/netfilter/nf_conntrack_core.c

   1 /* Connection state tracking for netfilter.  This is separated from,
   2    but required by, the NAT layer; it can also be used by an iptables
   3    extension. */
   4
   5 /* (C) 1999-2001 Paul `Rusty' Russell
   6  * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
   7  * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/netfilter.h>
  16 #include <linux/module.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/stddef.h>
  21 #include <linux/slab.h>
  22 #include <linux/random.h>
  23 #include <linux/jhash.h>
  24 #include <linux/err.h>
  25 #include <linux/percpu.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/notifier.h>
  28 #include <linux/kernel.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/socket.h>
  31 #include <linux/mm.h>
  32
  33 #include <net/netfilter/nf_conntrack.h>
  34 #include <net/netfilter/nf_conntrack_l3proto.h>
  35 #include <net/netfilter/nf_conntrack_l4proto.h>
  36 #include <net/netfilter/nf_conntrack_expect.h>
  37 #include <net/netfilter/nf_conntrack_helper.h>
  38 #include <net/netfilter/nf_conntrack_core.h>
  39 #include <net/netfilter/nf_conntrack_extend.h>
  40
  41 #define NF_CONNTRACK_VERSION    "0.5.0"
  42
  43 DEFINE_RWLOCK(nf_conntrack_lock);
  44 EXPORT_SYMBOL_GPL(nf_conntrack_lock);
  45
  46 /* nf_conntrack_standalone needs this */
  47 atomic_t nf_conntrack_count = ATOMIC_INIT(0);
  48 EXPORT_SYMBOL_GPL(nf_conntrack_count);
  49
  50 unsigned int nf_conntrack_htable_size __read_mostly;
  51 EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
  52
  53 int nf_conntrack_max __read_mostly;
  54 EXPORT_SYMBOL_GPL(nf_conntrack_max);
  55
  56 struct hlist_head *nf_conntrack_hash __read_mostly;
  57 EXPORT_SYMBOL_GPL(nf_conntrack_hash);
  58
  59 struct nf_conn nf_conntrack_untracked __read_mostly;
  60 EXPORT_SYMBOL_GPL(nf_conntrack_untracked);
  61
  62 unsigned int nf_ct_log_invalid __read_mostly;
  63 HLIST_HEAD(unconfirmed);
  64 static int nf_conntrack_vmalloc __read_mostly;
  65 static struct kmem_cache *nf_conntrack_cachep __read_mostly;
  66
  67 DEFINE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
  68 EXPORT_PER_CPU_SYMBOL(nf_conntrack_stat);
  69
  70 static int nf_conntrack_hash_rnd_initted;
  71 static unsigned int nf_conntrack_hash_rnd;
  72
  73 static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple,
  74                                   unsigned int size, unsigned int rnd)
  75 {
  76         unsigned int a, b;
  77
  78         a = jhash2(tuple->src.u3.all, ARRAY_SIZE(tuple->src.u3.all),
  79                    (tuple->src.l3num << 16) | tuple->dst.protonum);
  80         b = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
  81                    ((__force __u16)tuple->src.u.all << 16) |
  82                     (__force __u16)tuple->dst.u.all);
  83
  84         return ((u64)jhash_2words(a, b, rnd) * size) >> 32;
  85 }
  86
  87 static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple)
  88 {
  89         return __hash_conntrack(tuple, nf_conntrack_htable_size,
  90                                 nf_conntrack_hash_rnd);
  91 }
  92
  93 int
  94 nf_ct_get_tuple(const struct sk_buff *skb,
  95                 unsigned int nhoff,
  96                 unsigned int dataoff,
  97                 u_int16_t l3num,
  98                 u_int8_t protonum,
  99                 struct nf_conntrack_tuple *tuple,
 100                 const struct nf_conntrack_l3proto *l3proto,
 101                 const struct nf_conntrack_l4proto *l4proto)
 102 {
 103         NF_CT_TUPLE_U_BLANK(tuple);
 104
 105         tuple->src.l3num = l3num;
 106         if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0)
 107                 return 0;
 108
 109         tuple->dst.protonum = protonum;
 110         tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 111
 112         return l4proto->pkt_to_tuple(skb, dataoff, tuple);
 113 }
 114 EXPORT_SYMBOL_GPL(nf_ct_get_tuple);
 115
 116 int nf_ct_get_tuplepr(const struct sk_buff *skb,
 117                       unsigned int nhoff,
 118                       u_int16_t l3num,
 119                       struct nf_conntrack_tuple *tuple)
 120 {
 121         struct nf_conntrack_l3proto *l3proto;
 122         struct nf_conntrack_l4proto *l4proto;
 123         unsigned int protoff;
 124         u_int8_t protonum;
 125         int ret;
 126
 127         rcu_read_lock();
 128
 129         l3proto = __nf_ct_l3proto_find(l3num);
 130         ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum);
 131         if (ret != NF_ACCEPT) {
 132                 rcu_read_unlock();
 133                 return 0;
 134         }
 135
 136         l4proto = __nf_ct_l4proto_find(l3num, protonum);
 137
 138         ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple,
 139                               l3proto, l4proto);
 140
 141         rcu_read_unlock();
 142         return ret;
 143 }
 144 EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr);
 145
 146 int
 147 nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
 148                    const struct nf_conntrack_tuple *orig,
 149                    const struct nf_conntrack_l3proto *l3proto,
 150                    const struct nf_conntrack_l4proto *l4proto)
 151 {
 152         NF_CT_TUPLE_U_BLANK(inverse);
 153
 154         inverse->src.l3num = orig->src.l3num;
 155         if (l3proto->invert_tuple(inverse, orig) == 0)
 156                 return 0;
 157
 158         inverse->dst.dir = !orig->dst.dir;
 159
 160         inverse->dst.protonum = orig->dst.protonum;
 161         return l4proto->invert_tuple(inverse, orig);
 162 }
 163 EXPORT_SYMBOL_GPL(nf_ct_invert_tuple);
 164
 165 static void
 166 clean_from_lists(struct nf_conn *ct)
 167 {
 168         pr_debug("clean_from_lists(%p)\n", ct);
 169         hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
 170         hlist_del(&ct->tuplehash[IP_CT_DIR_REPLY].hnode);
 171
 172         /* Destroy all pending expectations */
 173         nf_ct_remove_expectations(ct);
 174 }
 175
 176 static void
 177 destroy_conntrack(struct nf_conntrack *nfct)
 178 {
 179         struct nf_conn *ct = (struct nf_conn *)nfct;
 180         struct nf_conntrack_l4proto *l4proto;
 181
 182         pr_debug("destroy_conntrack(%p)\n", ct);
 183         NF_CT_ASSERT(atomic_read(&nfct->use) == 0);
 184         NF_CT_ASSERT(!timer_pending(&ct->timeout));
 185
 186         nf_conntrack_event(IPCT_DESTROY, ct);
 187         set_bit(IPS_DYING_BIT, &ct->status);
 188
 189         /* To make sure we don't get any weird locking issues here:
 190          * destroy_conntrack() MUST NOT be called with a write lock
 191          * to nf_conntrack_lock!!! -HW */
 192         rcu_read_lock();
 193         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num,
 194                                        ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
 195         if (l4proto && l4proto->destroy)
 196                 l4proto->destroy(ct);
 197
 198         nf_ct_ext_destroy(ct);
 199
 200         rcu_read_unlock();
 201
 202         write_lock_bh(&nf_conntrack_lock);
 203         /* Expectations will have been removed in clean_from_lists,
 204          * except TFTP can create an expectation on the first packet,
 205          * before connection is in the list, so we need to clean here,
 206          * too. */
 207         nf_ct_remove_expectations(ct);
 208
 209         /* We overload first tuple to link into unconfirmed list. */
 210         if (!nf_ct_is_confirmed(ct)) {
 211                 BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode));
 212                 hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
 213         }
 214
 215         NF_CT_STAT_INC(delete);
 216         write_unlock_bh(&nf_conntrack_lock);
 217
 218         if (ct->master)
 219                 nf_ct_put(ct->master);
 220
 221         pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct);
 222         nf_conntrack_free(ct);
 223 }
 224
 225 static void death_by_timeout(unsigned long ul_conntrack)
 226 {
 227         struct nf_conn *ct = (void *)ul_conntrack;
 228         struct nf_conn_help *help = nfct_help(ct);
 229         struct nf_conntrack_helper *helper;
 230
 231         if (help) {
 232                 rcu_read_lock();
 233                 helper = rcu_dereference(help->helper);
 234                 if (helper && helper->destroy)
 235                         helper->destroy(ct);
 236                 rcu_read_unlock();
 237         }
 238
 239         write_lock_bh(&nf_conntrack_lock);
 240         /* Inside lock so preempt is disabled on module removal path.
 241          * Otherwise we can get spurious warnings. */
 242         NF_CT_STAT_INC(delete_list);
 243         clean_from_lists(ct);
 244         write_unlock_bh(&nf_conntrack_lock);
 245         nf_ct_put(ct);
 246 }
 247
 248 struct nf_conntrack_tuple_hash *
 249 __nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
 250                     const struct nf_conn *ignored_conntrack)
 251 {
 252         struct nf_conntrack_tuple_hash *h;
 253         struct hlist_node *n;
 254         unsigned int hash = hash_conntrack(tuple);
 255
 256         hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) {
 257                 if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack &&
 258                     nf_ct_tuple_equal(tuple, &h->tuple)) {
 259                         NF_CT_STAT_INC(found);
 260                         return h;
 261                 }
 262                 NF_CT_STAT_INC(searched);
 263         }
 264
 265         return NULL;
 266 }
 267 EXPORT_SYMBOL_GPL(__nf_conntrack_find);
 268
 269 /* Find a connection corresponding to a tuple. */
 270 struct nf_conntrack_tuple_hash *
 271 nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple)
 272 {
 273         struct nf_conntrack_tuple_hash *h;
 274
 275         read_lock_bh(&nf_conntrack_lock);
 276         h = __nf_conntrack_find(tuple, NULL);
 277         if (h)
 278                 atomic_inc(&nf_ct_tuplehash_to_ctrack(h)->ct_general.use);
 279         read_unlock_bh(&nf_conntrack_lock);
 280
 281         return h;
 282 }
 283 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 284
 285 static void __nf_conntrack_hash_insert(struct nf_conn *ct,
 286                                        unsigned int hash,
 287                                        unsigned int repl_hash)
 288 {
 289         hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
 290                        &nf_conntrack_hash[hash]);
 291         hlist_add_head(&ct->tuplehash[IP_CT_DIR_REPLY].hnode,
 292                        &nf_conntrack_hash[repl_hash]);
 293 }
 294
 295 void nf_conntrack_hash_insert(struct nf_conn *ct)
 296 {
 297         unsigned int hash, repl_hash;
 298
 299         hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 300         repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 301
 302         write_lock_bh(&nf_conntrack_lock);
 303         __nf_conntrack_hash_insert(ct, hash, repl_hash);
 304         write_unlock_bh(&nf_conntrack_lock);
 305 }
 306 EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
 307
 308 /* Confirm a connection given skb; places it in hash table */
 309 int
 310 __nf_conntrack_confirm(struct sk_buff *skb)
 311 {
 312         unsigned int hash, repl_hash;
 313         struct nf_conntrack_tuple_hash *h;
 314         struct nf_conn *ct;
 315         struct nf_conn_help *help;
 316         struct hlist_node *n;
 317         enum ip_conntrack_info ctinfo;
 318
 319         ct = nf_ct_get(skb, &ctinfo);
 320
 321         /* ipt_REJECT uses nf_conntrack_attach to attach related
 322            ICMP/TCP RST packets in other direction.  Actual packet
 323            which created connection will be IP_CT_NEW or for an
 324            expected connection, IP_CT_RELATED. */
 325         if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
 326                 return NF_ACCEPT;
 327
 328         hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
 329         repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 330
 331         /* We're not in hash table, and we refuse to set up related
 332            connections for unconfirmed conns.  But packet copies and
 333            REJECT will give spurious warnings here. */
 334         /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
 335
 336         /* No external references means noone else could have
 337            confirmed us. */
 338         NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
 339         pr_debug("Confirming conntrack %p\n", ct);
 340
 341         write_lock_bh(&nf_conntrack_lock);
 342
 343         /* See if there's one in the list already, including reverse:
 344            NAT could have grabbed it without realizing, since we're
 345            not in the hash.  If there is, we lost race. */
 346         hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode)
 347                 if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 348                                       &h->tuple))
 349                         goto out;
 350         hlist_for_each_entry(h, n, &nf_conntrack_hash[repl_hash], hnode)
 351                 if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 352                                       &h->tuple))
 353                         goto out;
 354
 355         /* Remove from unconfirmed list */
 356         hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode);
 357
 358         __nf_conntrack_hash_insert(ct, hash, repl_hash);
 359         /* Timer relative to confirmation time, not original
 360            setting time, otherwise we'd get timer wrap in
 361            weird delay cases. */
 362         ct->timeout.expires += jiffies;
 363         add_timer(&ct->timeout);
 364         atomic_inc(&ct->ct_general.use);
 365         set_bit(IPS_CONFIRMED_BIT, &ct->status);
 366         NF_CT_STAT_INC(insert);
 367         write_unlock_bh(&nf_conntrack_lock);
 368         help = nfct_help(ct);
 369         if (help && help->helper)
 370                 nf_conntrack_event_cache(IPCT_HELPER, skb);
 371 #ifdef CONFIG_NF_NAT_NEEDED
 372         if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) ||
 373             test_bit(IPS_DST_NAT_DONE_BIT, &ct->status))
 374                 nf_conntrack_event_cache(IPCT_NATINFO, skb);
 375 #endif
 376         nf_conntrack_event_cache(master_ct(ct) ?
 377                                  IPCT_RELATED : IPCT_NEW, skb);
 378         return NF_ACCEPT;
 379
 380 out:
 381         NF_CT_STAT_INC(insert_failed);
 382         write_unlock_bh(&nf_conntrack_lock);
 383         return NF_DROP;
 384 }
 385 EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
 386
 387 /* Returns true if a connection correspondings to the tuple (required
 388    for NAT). */
 389 int
 390 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
 391                          const struct nf_conn *ignored_conntrack)
 392 {
 393         struct nf_conntrack_tuple_hash *h;
 394
 395         read_lock_bh(&nf_conntrack_lock);
 396         h = __nf_conntrack_find(tuple, ignored_conntrack);
 397         read_unlock_bh(&nf_conntrack_lock);
 398
 399         return h != NULL;
 400 }
 401 EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
 402
 403 #define NF_CT_EVICTION_RANGE    8
 404
 405 /* There's a small race here where we may free a just-assured
 406    connection.  Too bad: we're in trouble anyway. */
 407 static int early_drop(unsigned int hash)
 408 {
 409         /* Use oldest entry, which is roughly LRU */
 410         struct nf_conntrack_tuple_hash *h;
 411         struct nf_conn *ct = NULL, *tmp;
 412         struct hlist_node *n;
 413         unsigned int i, cnt = 0;
 414         int dropped = 0;
 415
 416         read_lock_bh(&nf_conntrack_lock);
 417         for (i = 0; i < nf_conntrack_htable_size; i++) {
 418                 hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) {
 419                         tmp = nf_ct_tuplehash_to_ctrack(h);
 420                         if (!test_bit(IPS_ASSURED_BIT, &tmp->status))
 421                                 ct = tmp;
 422                         cnt++;
 423                 }
 424                 if (ct || cnt >= NF_CT_EVICTION_RANGE)
 425                         break;
 426                 hash = (hash + 1) % nf_conntrack_htable_size;
 427         }
 428         if (ct)
 429                 atomic_inc(&ct->ct_general.use);
 430         read_unlock_bh(&nf_conntrack_lock);
 431
 432         if (!ct)
 433                 return dropped;
 434
 435         if (del_timer(&ct->timeout)) {
 436                 death_by_timeout((unsigned long)ct);
 437                 dropped = 1;
 438                 NF_CT_STAT_INC_ATOMIC(early_drop);
 439         }
 440         nf_ct_put(ct);
 441         return dropped;
 442 }
 443
 444 struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
 445                                    const struct nf_conntrack_tuple *repl)
 446 {
 447         struct nf_conn *conntrack = NULL;
 448
 449         if (unlikely(!nf_conntrack_hash_rnd_initted)) {
 450                 get_random_bytes(&nf_conntrack_hash_rnd, 4);
 451                 nf_conntrack_hash_rnd_initted = 1;
 452         }
 453
 454         /* We don't want any race condition at early drop stage */
 455         atomic_inc(&nf_conntrack_count);
 456
 457         if (nf_conntrack_max
 458             && atomic_read(&nf_conntrack_count) > nf_conntrack_max) {
 459                 unsigned int hash = hash_conntrack(orig);
 460                 if (!early_drop(hash)) {
 461                         atomic_dec(&nf_conntrack_count);
 462                         if (net_ratelimit())
 463                                 printk(KERN_WARNING
 464                                        "nf_conntrack: table full, dropping"
 465                                        " packet.\n");
 466                         return ERR_PTR(-ENOMEM);
 467                 }
 468         }
 469
 470         conntrack = kmem_cache_zalloc(nf_conntrack_cachep, GFP_ATOMIC);
 471         if (conntrack == NULL) {
 472                 pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n");
 473                 atomic_dec(&nf_conntrack_count);
 474                 return ERR_PTR(-ENOMEM);
 475         }
 476
 477         atomic_set(&conntrack->ct_general.use, 1);
 478         conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
 479         conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
 480         /* Don't set timer yet: wait for confirmation */
 481         setup_timer(&conntrack->timeout, death_by_timeout,
 482                     (unsigned long)conntrack);
 483
 484         return conntrack;
 485 }
 486 EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
 487
 488 void nf_conntrack_free(struct nf_conn *conntrack)
 489 {
 490         nf_ct_ext_free(conntrack);
 491         kmem_cache_free(nf_conntrack_cachep, conntrack);
 492         atomic_dec(&nf_conntrack_count);
 493 }
 494 EXPORT_SYMBOL_GPL(nf_conntrack_free);
 495
 496 /* Allocate a new conntrack: we return -ENOMEM if classification
 497    failed due to stress.  Otherwise it really is unclassifiable. */
 498 static struct nf_conntrack_tuple_hash *
 499 init_conntrack(const struct nf_conntrack_tuple *tuple,
 500                struct nf_conntrack_l3proto *l3proto,
 501                struct nf_conntrack_l4proto *l4proto,
 502                struct sk_buff *skb,
 503                unsigned int dataoff)
 504 {
 505         struct nf_conn *conntrack;
 506         struct nf_conn_help *help;
 507         struct nf_conntrack_tuple repl_tuple;
 508         struct nf_conntrack_expect *exp;
 509
 510         if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) {
 511                 pr_debug("Can't invert tuple.\n");
 512                 return NULL;
 513         }
 514
 515         conntrack = nf_conntrack_alloc(tuple, &repl_tuple);
 516         if (conntrack == NULL || IS_ERR(conntrack)) {
 517                 pr_debug("Can't allocate conntrack.\n");
 518                 return (struct nf_conntrack_tuple_hash *)conntrack;
 519         }
 520
 521         if (!l4proto->new(conntrack, skb, dataoff)) {
 522                 nf_conntrack_free(conntrack);
 523                 pr_debug("init conntrack: can't track with proto module\n");
 524                 return NULL;
 525         }
 526
 527         write_lock_bh(&nf_conntrack_lock);
 528         exp = nf_ct_find_expectation(tuple);
 529         if (exp) {
 530                 pr_debug("conntrack: expectation arrives ct=%p exp=%p\n",
 531                          conntrack, exp);
 532                 /* Welcome, Mr. Bond.  We've been expecting you... */
 533                 __set_bit(IPS_EXPECTED_BIT, &conntrack->status);
 534                 conntrack->master = exp->master;
 535                 if (exp->helper) {
 536                         help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);
 537                         if (help)
 538                                 rcu_assign_pointer(help->helper, exp->helper);
 539                 }
 540
 541 #ifdef CONFIG_NF_CONNTRACK_MARK
 542                 conntrack->mark = exp->master->mark;
 543 #endif
 544 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 545                 conntrack->secmark = exp->master->secmark;
 546 #endif
 547                 nf_conntrack_get(&conntrack->master->ct_general);
 548                 NF_CT_STAT_INC(expect_new);
 549         } else {
 550                 struct nf_conntrack_helper *helper;
 551
 552                 helper = __nf_ct_helper_find(&repl_tuple);
 553                 if (helper) {
 554                         help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC);
 555                         if (help)
 556                                 rcu_assign_pointer(help->helper, helper);
 557                 }
 558                 NF_CT_STAT_INC(new);
 559         }
 560
 561         /* Overload tuple linked list to put us in unconfirmed list. */
 562         hlist_add_head(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
 563                        &unconfirmed);
 564
 565         write_unlock_bh(&nf_conntrack_lock);
 566
 567         if (exp) {
 568                 if (exp->expectfn)
 569                         exp->expectfn(conntrack, exp);
 570                 nf_ct_expect_put(exp);
 571         }
 572
 573         return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
 574 }
 575
 576 /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
 577 static inline struct nf_conn *
 578 resolve_normal_ct(struct sk_buff *skb,
 579                   unsigned int dataoff,
 580                   u_int16_t l3num,
 581                   u_int8_t protonum,
 582                   struct nf_conntrack_l3proto *l3proto,
 583                   struct nf_conntrack_l4proto *l4proto,
 584                   int *set_reply,
 585                   enum ip_conntrack_info *ctinfo)
 586 {
 587         struct nf_conntrack_tuple tuple;
 588         struct nf_conntrack_tuple_hash *h;
 589         struct nf_conn *ct;
 590
 591         if (!nf_ct_get_tuple(skb, skb_network_offset(skb),
 592                              dataoff, l3num, protonum, &tuple, l3proto,
 593                              l4proto)) {
 594                 pr_debug("resolve_normal_ct: Can't get tuple\n");
 595                 return NULL;
 596         }
 597
 598         /* look for tuple match */
 599         h = nf_conntrack_find_get(&tuple);
 600         if (!h) {
 601                 h = init_conntrack(&tuple, l3proto, l4proto, skb, dataoff);
 602                 if (!h)
 603                         return NULL;
 604                 if (IS_ERR(h))
 605                         return (void *)h;
 606         }
 607         ct = nf_ct_tuplehash_to_ctrack(h);
 608
 609         /* It exists; we have (non-exclusive) reference. */
 610         if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) {
 611                 *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY;
 612                 /* Please set reply bit if this packet OK */
 613                 *set_reply = 1;
 614         } else {
 615                 /* Once we've had two way comms, always ESTABLISHED. */
 616                 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
 617                         pr_debug("nf_conntrack_in: normal packet for %p\n", ct);
 618                         *ctinfo = IP_CT_ESTABLISHED;
 619                 } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
 620                         pr_debug("nf_conntrack_in: related packet for %p\n",
 621                                  ct);
 622                         *ctinfo = IP_CT_RELATED;
 623                 } else {
 624                         pr_debug("nf_conntrack_in: new packet for %p\n", ct);
 625                         *ctinfo = IP_CT_NEW;
 626                 }
 627                 *set_reply = 0;
 628         }
 629         skb->nfct = &ct->ct_general;
 630         skb->nfctinfo = *ctinfo;
 631         return ct;
 632 }
 633
 634 unsigned int
 635 nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff *skb)
 636 {
 637         struct nf_conn *ct;
 638         enum ip_conntrack_info ctinfo;
 639         struct nf_conntrack_l3proto *l3proto;
 640         struct nf_conntrack_l4proto *l4proto;
 641         unsigned int dataoff;
 642         u_int8_t protonum;
 643         int set_reply = 0;
 644         int ret;
 645
 646         /* Previously seen (loopback or untracked)?  Ignore. */
 647         if (skb->nfct) {
 648                 NF_CT_STAT_INC_ATOMIC(ignore);
 649                 return NF_ACCEPT;
 650         }
 651
 652         /* rcu_read_lock()ed by nf_hook_slow */
 653         l3proto = __nf_ct_l3proto_find((u_int16_t)pf);
 654         ret = l3proto->get_l4proto(skb, skb_network_offset(skb),
 655                                    &dataoff, &protonum);
 656         if (ret <= 0) {
 657                 pr_debug("not prepared to track yet or error occured\n");
 658                 NF_CT_STAT_INC_ATOMIC(error);
 659                 NF_CT_STAT_INC_ATOMIC(invalid);
 660                 return -ret;
 661         }
 662
 663         l4proto = __nf_ct_l4proto_find((u_int16_t)pf, protonum);
 664
 665         /* It may be an special packet, error, unclean...
 666          * inverse of the return code tells to the netfilter
 667          * core what to do with the packet. */
 668         if (l4proto->error != NULL &&
 669             (ret = l4proto->error(skb, dataoff, &ctinfo, pf, hooknum)) <= 0) {
 670                 NF_CT_STAT_INC_ATOMIC(error);
 671                 NF_CT_STAT_INC_ATOMIC(invalid);
 672                 return -ret;
 673         }
 674
 675         ct = resolve_normal_ct(skb, dataoff, pf, protonum, l3proto, l4proto,
 676                                &set_reply, &ctinfo);
 677         if (!ct) {
 678                 /* Not valid part of a connection */
 679                 NF_CT_STAT_INC_ATOMIC(invalid);
 680                 return NF_ACCEPT;
 681         }
 682
 683         if (IS_ERR(ct)) {
 684                 /* Too stressed to deal. */
 685                 NF_CT_STAT_INC_ATOMIC(drop);
 686                 return NF_DROP;
 687         }
 688
 689         NF_CT_ASSERT(skb->nfct);
 690
 691         ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum);
 692         if (ret < 0) {
 693                 /* Invalid: inverse of the return code tells
 694                  * the netfilter core what to do */
 695                 pr_debug("nf_conntrack_in: Can't track with proto module\n");
 696                 nf_conntrack_put(skb->nfct);
 697                 skb->nfct = NULL;
 698                 NF_CT_STAT_INC_ATOMIC(invalid);
 699                 return -ret;
 700         }
 701
 702         if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
 703                 nf_conntrack_event_cache(IPCT_STATUS, skb);
 704
 705         return ret;
 706 }
 707 EXPORT_SYMBOL_GPL(nf_conntrack_in);
 708
 709 int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
 710                          const struct nf_conntrack_tuple *orig)
 711 {
 712         int ret;
 713
 714         rcu_read_lock();
 715         ret = nf_ct_invert_tuple(inverse, orig,
 716                                  __nf_ct_l3proto_find(orig->src.l3num),
 717                                  __nf_ct_l4proto_find(orig->src.l3num,
 718                                                       orig->dst.protonum));
 719         rcu_read_unlock();
 720         return ret;
 721 }
 722 EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr);
 723
 724 /* Alter reply tuple (maybe alter helper).  This is for NAT, and is
 725    implicitly racy: see __nf_conntrack_confirm */
 726 void nf_conntrack_alter_reply(struct nf_conn *ct,
 727                               const struct nf_conntrack_tuple *newreply)
 728 {
 729         struct nf_conn_help *help = nfct_help(ct);
 730         struct nf_conntrack_helper *helper;
 731
 732         write_lock_bh(&nf_conntrack_lock);
 733         /* Should be unconfirmed, so not in hash table yet */
 734         NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
 735
 736         pr_debug("Altering reply tuple of %p to ", ct);
 737         NF_CT_DUMP_TUPLE(newreply);
 738
 739         ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
 740         if (ct->master || (help && help->expecting != 0))
 741                 goto out;
 742
 743         helper = __nf_ct_helper_find(newreply);
 744         if (helper == NULL) {
 745                 if (help)
 746                         rcu_assign_pointer(help->helper, NULL);
 747                 goto out;
 748         }
 749
 750         if (help == NULL) {
 751                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
 752                 if (help == NULL)
 753                         goto out;
 754         } else {
 755                 memset(&help->help, 0, sizeof(help->help));
 756         }
 757
 758         rcu_assign_pointer(help->helper, helper);
 759 out:
 760         write_unlock_bh(&nf_conntrack_lock);
 761 }
 762 EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
 763
 764 /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
 765 void __nf_ct_refresh_acct(struct nf_conn *ct,
 766                           enum ip_conntrack_info ctinfo,
 767                           const struct sk_buff *skb,
 768                           unsigned long extra_jiffies,
 769                           int do_acct)
 770 {
 771         int event = 0;
 772
 773         NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
 774         NF_CT_ASSERT(skb);
 775
 776         write_lock_bh(&nf_conntrack_lock);
 777
 778         /* Only update if this is not a fixed timeout */
 779         if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) {
 780                 write_unlock_bh(&nf_conntrack_lock);
 781                 return;
 782         }
 783
 784         /* If not in hash table, timer will not be active yet */
 785         if (!nf_ct_is_confirmed(ct)) {
 786                 ct->timeout.expires = extra_jiffies;
 787                 event = IPCT_REFRESH;
 788         } else {
 789                 unsigned long newtime = jiffies + extra_jiffies;
 790
 791                 /* Only update the timeout if the new timeout is at least
 792                    HZ jiffies from the old timeout. Need del_timer for race
 793                    avoidance (may already be dying). */
 794                 if (newtime - ct->timeout.expires >= HZ
 795                     && del_timer(&ct->timeout)) {
 796                         ct->timeout.expires = newtime;
 797                         add_timer(&ct->timeout);
 798                         event = IPCT_REFRESH;
 799                 }
 800         }
 801
 802 #ifdef CONFIG_NF_CT_ACCT
 803         if (do_acct) {
 804                 ct->counters[CTINFO2DIR(ctinfo)].packets++;
 805                 ct->counters[CTINFO2DIR(ctinfo)].bytes +=
 806                         skb->len - skb_network_offset(skb);
 807
 808                 if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000)
 809                     || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000))
 810                         event |= IPCT_COUNTER_FILLING;
 811         }
 812 #endif
 813
 814         write_unlock_bh(&nf_conntrack_lock);
 815
 816         /* must be unlocked when calling event cache */
 817         if (event)
 818                 nf_conntrack_event_cache(event, skb);
 819 }
 820 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
 821
 822 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 823
 824 #include <linux/netfilter/nfnetlink.h>
 825 #include <linux/netfilter/nfnetlink_conntrack.h>
 826 #include <linux/mutex.h>
 827
 828 /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
 829  * in ip_conntrack_core, since we don't want the protocols to autoload
 830  * or depend on ctnetlink */
 831 int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
 832                                const struct nf_conntrack_tuple *tuple)
 833 {
 834         NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port);
 835         NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port);
 836         return 0;
 837
 838 nla_put_failure:
 839         return -1;
 840 }
 841 EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr);
 842
 843 const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = {
 844         [CTA_PROTO_SRC_PORT]  = { .type = NLA_U16 },
 845         [CTA_PROTO_DST_PORT]  = { .type = NLA_U16 },
 846 };
 847 EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy);
 848
 849 int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
 850                                struct nf_conntrack_tuple *t)
 851 {
 852         if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT])
 853                 return -EINVAL;
 854
 855         t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]);
 856         t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]);
 857
 858         return 0;
 859 }
 860 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple);
 861 #endif
 862
 863 /* Used by ipt_REJECT and ip6t_REJECT. */
 864 static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
 865 {
 866         struct nf_conn *ct;
 867         enum ip_conntrack_info ctinfo;
 868
 869         /* This ICMP is in reverse direction to the packet which caused it */
 870         ct = nf_ct_get(skb, &ctinfo);
 871         if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
 872                 ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY;
 873         else
 874                 ctinfo = IP_CT_RELATED;
 875
 876         /* Attach to new skbuff, and increment count */
 877         nskb->nfct = &ct->ct_general;
 878         nskb->nfctinfo = ctinfo;
 879         nf_conntrack_get(nskb->nfct);
 880 }
 881
 882 static inline int
 883 do_iter(const struct nf_conntrack_tuple_hash *i,
 884         int (*iter)(struct nf_conn *i, void *data),
 885         void *data)
 886 {
 887         return iter(nf_ct_tuplehash_to_ctrack(i), data);
 888 }
 889
 890 /* Bring out ya dead! */
 891 static struct nf_conn *
 892 get_next_corpse(int (*iter)(struct nf_conn *i, void *data),
 893                 void *data, unsigned int *bucket)
 894 {
 895         struct nf_conntrack_tuple_hash *h;
 896         struct nf_conn *ct;
 897         struct hlist_node *n;
 898
 899         write_lock_bh(&nf_conntrack_lock);
 900         for (; *bucket < nf_conntrack_htable_size; (*bucket)++) {
 901                 hlist_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnode) {
 902                         ct = nf_ct_tuplehash_to_ctrack(h);
 903                         if (iter(ct, data))
 904                                 goto found;
 905                 }
 906         }
 907         hlist_for_each_entry(h, n, &unconfirmed, hnode) {
 908                 ct = nf_ct_tuplehash_to_ctrack(h);
 909                 if (iter(ct, data))
 910                         set_bit(IPS_DYING_BIT, &ct->status);
 911         }
 912         write_unlock_bh(&nf_conntrack_lock);
 913         return NULL;
 914 found:
 915         atomic_inc(&ct->ct_general.use);
 916         write_unlock_bh(&nf_conntrack_lock);
 917         return ct;
 918 }
 919
 920 void
 921 nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data)
 922 {
 923         struct nf_conn *ct;
 924         unsigned int bucket = 0;
 925
 926         while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) {
 927                 /* Time to push up daises... */
 928                 if (del_timer(&ct->timeout))
 929                         death_by_timeout((unsigned long)ct);
 930                 /* ... else the timer will get him soon. */
 931
 932                 nf_ct_put(ct);
 933         }
 934 }
 935 EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup);
 936
 937 static int kill_all(struct nf_conn *i, void *data)
 938 {
 939         return 1;
 940 }
 941
 942 void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, unsigned int size)
 943 {
 944         if (vmalloced)
 945                 vfree(hash);
 946         else
 947                 free_pages((unsigned long)hash,
 948                            get_order(sizeof(struct hlist_head) * size));
 949 }
 950 EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
 951
 952 void nf_conntrack_flush(void)
 953 {
 954         nf_ct_iterate_cleanup(kill_all, NULL);
 955 }
 956 EXPORT_SYMBOL_GPL(nf_conntrack_flush);
 957
 958 /* Mishearing the voices in his head, our hero wonders how he's
 959    supposed to kill the mall. */
 960 void nf_conntrack_cleanup(void)
 961 {
 962         rcu_assign_pointer(ip_ct_attach, NULL);
 963
 964         /* This makes sure all current packets have passed through
 965            netfilter framework.  Roll on, two-stage module
 966            delete... */
 967         synchronize_net();
 968
 969         nf_ct_event_cache_flush();
 970  i_see_dead_people:
 971         nf_conntrack_flush();
 972         if (atomic_read(&nf_conntrack_count) != 0) {
 973                 schedule();
 974                 goto i_see_dead_people;
 975         }
 976         /* wait until all references to nf_conntrack_untracked are dropped */
 977         while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1)
 978                 schedule();
 979
 980         rcu_assign_pointer(nf_ct_destroy, NULL);
 981
 982         kmem_cache_destroy(nf_conntrack_cachep);
 983         nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc,
 984                              nf_conntrack_htable_size);
 985
 986         nf_conntrack_proto_fini();
 987         nf_conntrack_helper_fini();
 988         nf_conntrack_expect_fini();
 989 }
 990
 991 struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced)
 992 {
 993         struct hlist_head *hash;
 994         unsigned int size, i;
 995
 996         *vmalloced = 0;
 997
 998         size = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_head));
 999         hash = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN,
1000                                        get_order(sizeof(struct hlist_head)
1001                                                  * size));
1002         if (!hash) {
1003                 *vmalloced = 1;
1004                 printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n");
1005                 hash = vmalloc(sizeof(struct hlist_head) * size);
1006         }
1007
1008         if (hash)
1009                 for (i = 0; i < size; i++)
1010                         INIT_HLIST_HEAD(&hash[i]);
1011
1012         return hash;
1013 }
1014 EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable);
1015
1016 int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
1017 {
1018         int i, bucket, vmalloced, old_vmalloced;
1019         unsigned int hashsize, old_size;
1020         int rnd;
1021         struct hlist_head *hash, *old_hash;
1022         struct nf_conntrack_tuple_hash *h;
1023
1024         /* On boot, we can set this without any fancy locking. */
1025         if (!nf_conntrack_htable_size)
1026                 return param_set_uint(val, kp);
1027
1028         hashsize = simple_strtoul(val, NULL, 0);
1029         if (!hashsize)
1030                 return -EINVAL;
1031
1032         hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced);
1033         if (!hash)
1034                 return -ENOMEM;
1035
1036         /* We have to rehahs for the new table anyway, so we also can
1037          * use a newrandom seed */
1038         get_random_bytes(&rnd, 4);
1039
1040         write_lock_bh(&nf_conntrack_lock);
1041         for (i = 0; i < nf_conntrack_htable_size; i++) {
1042                 while (!hlist_empty(&nf_conntrack_hash[i])) {
1043                         h = hlist_entry(nf_conntrack_hash[i].first,
1044                                         struct nf_conntrack_tuple_hash, hnode);
1045                         hlist_del(&h->hnode);
1046                         bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
1047                         hlist_add_head(&h->hnode, &hash[bucket]);
1048                 }
1049         }
1050         old_size = nf_conntrack_htable_size;
1051         old_vmalloced = nf_conntrack_vmalloc;
1052         old_hash = nf_conntrack_hash;
1053
1054         nf_conntrack_htable_size = hashsize;
1055         nf_conntrack_vmalloc = vmalloced;
1056         nf_conntrack_hash = hash;
1057         nf_conntrack_hash_rnd = rnd;
1058         write_unlock_bh(&nf_conntrack_lock);
1059
1060         nf_ct_free_hashtable(old_hash, old_vmalloced, old_size);
1061         return 0;
1062 }
1063 EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize);
1064
1065 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
1066                   &nf_conntrack_htable_size, 0600);
1067
1068 int __init nf_conntrack_init(void)
1069 {
1070         int max_factor = 8;
1071         int ret;
1072
1073         /* Idea from tcp.c: use 1/16384 of memory.  On i386: 32MB
1074          * machine has 512 buckets. >= 1GB machines have 16384 buckets. */
1075         if (!nf_conntrack_htable_size) {
1076                 nf_conntrack_htable_size
1077                         = (((num_physpages << PAGE_SHIFT) / 16384)
1078                            / sizeof(struct hlist_head));
1079                 if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
1080                         nf_conntrack_htable_size = 16384;
1081                 if (nf_conntrack_htable_size < 32)
1082                         nf_conntrack_htable_size = 32;
1083
1084                 /* Use a max. factor of four by default to get the same max as
1085                  * with the old struct list_heads. When a table size is given
1086                  * we use the old value of 8 to avoid reducing the max.
1087                  * entries. */
1088                 max_factor = 4;
1089         }
1090         nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size,
1091                                                   &nf_conntrack_vmalloc);
1092         if (!nf_conntrack_hash) {
1093                 printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
1094                 goto err_out;
1095         }
1096
1097         nf_conntrack_max = max_factor * nf_conntrack_htable_size;
1098
1099         printk("nf_conntrack version %s (%u buckets, %d max)\n",
1100                NF_CONNTRACK_VERSION, nf_conntrack_htable_size,
1101                nf_conntrack_max);
1102
1103         nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
1104                                                 sizeof(struct nf_conn),
1105                                                 0, 0, NULL);
1106         if (!nf_conntrack_cachep) {
1107                 printk(KERN_ERR "Unable to create nf_conn slab cache\n");
1108                 goto err_free_hash;
1109         }
1110
1111         ret = nf_conntrack_proto_init();
1112         if (ret < 0)
1113                 goto err_free_conntrack_slab;
1114
1115         ret = nf_conntrack_expect_init();
1116         if (ret < 0)
1117                 goto out_fini_proto;
1118
1119         ret = nf_conntrack_helper_init();
1120         if (ret < 0)
1121                 goto out_fini_expect;
1122
1123         /* For use by REJECT target */
1124         rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach);
1125         rcu_assign_pointer(nf_ct_destroy, destroy_conntrack);
1126
1127         /* Set up fake conntrack:
1128             - to never be deleted, not in any hashes */
1129         atomic_set(&nf_conntrack_untracked.ct_general.use, 1);
1130         /*  - and look it like as a confirmed connection */
1131         set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status);
1132
1133         return ret;
1134
1135 out_fini_expect:
1136         nf_conntrack_expect_fini();
1137 out_fini_proto:
1138         nf_conntrack_proto_fini();
1139 err_free_conntrack_slab:
1140         kmem_cache_destroy(nf_conntrack_cachep);
1141 err_free_hash:
1142         nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc,
1143                              nf_conntrack_htable_size);
1144 err_out:
1145         return -ENOMEM;
1146 }