git.rot13.org Git - linux/blob - net/netfilter/nf_conntrack_standalone.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/netfilter.h>
   4 #include <linux/slab.h>
   5 #include <linux/module.h>
   6 #include <linux/skbuff.h>
   7 #include <linux/proc_fs.h>
   8 #include <linux/seq_file.h>
   9 #include <linux/percpu.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/security.h>
  12 #include <net/net_namespace.h>
  13 #ifdef CONFIG_SYSCTL
  14 #include <linux/sysctl.h>
  15 #endif
  16
  17 #include <net/netfilter/nf_conntrack.h>
  18 #include <net/netfilter/nf_conntrack_core.h>
  19 #include <net/netfilter/nf_conntrack_l4proto.h>
  20 #include <net/netfilter/nf_conntrack_expect.h>
  21 #include <net/netfilter/nf_conntrack_helper.h>
  22 #include <net/netfilter/nf_conntrack_acct.h>
  23 #include <net/netfilter/nf_conntrack_zones.h>
  24 #include <net/netfilter/nf_conntrack_timestamp.h>
  25 #include <linux/rculist_nulls.h>
  26
  27 unsigned int nf_conntrack_net_id __read_mostly;
  28
  29 #ifdef CONFIG_NF_CONNTRACK_PROCFS
  30 void
  31 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  32             const struct nf_conntrack_l4proto *l4proto)
  33 {
  34         switch (tuple->src.l3num) {
  35         case NFPROTO_IPV4:
  36                 seq_printf(s, "src=%pI4 dst=%pI4 ",
  37                            &tuple->src.u3.ip, &tuple->dst.u3.ip);
  38                 break;
  39         case NFPROTO_IPV6:
  40                 seq_printf(s, "src=%pI6 dst=%pI6 ",
  41                            tuple->src.u3.ip6, tuple->dst.u3.ip6);
  42                 break;
  43         default:
  44                 break;
  45         }
  46
  47         switch (l4proto->l4proto) {
  48         case IPPROTO_ICMP:
  49                 seq_printf(s, "type=%u code=%u id=%u ",
  50                            tuple->dst.u.icmp.type,
  51                            tuple->dst.u.icmp.code,
  52                            ntohs(tuple->src.u.icmp.id));
  53                 break;
  54         case IPPROTO_TCP:
  55                 seq_printf(s, "sport=%hu dport=%hu ",
  56                            ntohs(tuple->src.u.tcp.port),
  57                            ntohs(tuple->dst.u.tcp.port));
  58                 break;
  59         case IPPROTO_UDPLITE: /* fallthrough */
  60         case IPPROTO_UDP:
  61                 seq_printf(s, "sport=%hu dport=%hu ",
  62                            ntohs(tuple->src.u.udp.port),
  63                            ntohs(tuple->dst.u.udp.port));
  64
  65                 break;
  66         case IPPROTO_DCCP:
  67                 seq_printf(s, "sport=%hu dport=%hu ",
  68                            ntohs(tuple->src.u.dccp.port),
  69                            ntohs(tuple->dst.u.dccp.port));
  70                 break;
  71         case IPPROTO_SCTP:
  72                 seq_printf(s, "sport=%hu dport=%hu ",
  73                            ntohs(tuple->src.u.sctp.port),
  74                            ntohs(tuple->dst.u.sctp.port));
  75                 break;
  76         case IPPROTO_ICMPV6:
  77                 seq_printf(s, "type=%u code=%u id=%u ",
  78                            tuple->dst.u.icmp.type,
  79                            tuple->dst.u.icmp.code,
  80                            ntohs(tuple->src.u.icmp.id));
  81                 break;
  82         case IPPROTO_GRE:
  83                 seq_printf(s, "srckey=0x%x dstkey=0x%x ",
  84                            ntohs(tuple->src.u.gre.key),
  85                            ntohs(tuple->dst.u.gre.key));
  86                 break;
  87         default:
  88                 break;
  89         }
  90 }
  91 EXPORT_SYMBOL_GPL(print_tuple);
  92
  93 struct ct_iter_state {
  94         struct seq_net_private p;
  95         struct hlist_nulls_head *hash;
  96         unsigned int htable_size;
  97         unsigned int bucket;
  98         u_int64_t time_now;
  99 };
 100
 101 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 102 {
 103         struct ct_iter_state *st = seq->private;
 104         struct hlist_nulls_node *n;
 105
 106         for (st->bucket = 0;
 107              st->bucket < st->htable_size;
 108              st->bucket++) {
 109                 n = rcu_dereference(
 110                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 111                 if (!is_a_nulls(n))
 112                         return n;
 113         }
 114         return NULL;
 115 }
 116
 117 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 118                                       struct hlist_nulls_node *head)
 119 {
 120         struct ct_iter_state *st = seq->private;
 121
 122         head = rcu_dereference(hlist_nulls_next_rcu(head));
 123         while (is_a_nulls(head)) {
 124                 if (likely(get_nulls_value(head) == st->bucket)) {
 125                         if (++st->bucket >= st->htable_size)
 126                                 return NULL;
 127                 }
 128                 head = rcu_dereference(
 129                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 130         }
 131         return head;
 132 }
 133
 134 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 135 {
 136         struct hlist_nulls_node *head = ct_get_first(seq);
 137
 138         if (head)
 139                 while (pos && (head = ct_get_next(seq, head)))
 140                         pos--;
 141         return pos ? NULL : head;
 142 }
 143
 144 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 145         __acquires(RCU)
 146 {
 147         struct ct_iter_state *st = seq->private;
 148
 149         st->time_now = ktime_get_real_ns();
 150         rcu_read_lock();
 151
 152         nf_conntrack_get_ht(&st->hash, &st->htable_size);
 153         return ct_get_idx(seq, *pos);
 154 }
 155
 156 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 157 {
 158         (*pos)++;
 159         return ct_get_next(s, v);
 160 }
 161
 162 static void ct_seq_stop(struct seq_file *s, void *v)
 163         __releases(RCU)
 164 {
 165         rcu_read_unlock();
 166 }
 167
 168 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 169 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 170 {
 171         int ret;
 172         u32 len;
 173         char *secctx;
 174
 175         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 176         if (ret)
 177                 return;
 178
 179         seq_printf(s, "secctx=%s ", secctx);
 180
 181         security_release_secctx(secctx, len);
 182 }
 183 #else
 184 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 185 {
 186 }
 187 #endif
 188
 189 #ifdef CONFIG_NF_CONNTRACK_ZONES
 190 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 191                          int dir)
 192 {
 193         const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
 194
 195         if (zone->dir != dir)
 196                 return;
 197         switch (zone->dir) {
 198         case NF_CT_DEFAULT_ZONE_DIR:
 199                 seq_printf(s, "zone=%u ", zone->id);
 200                 break;
 201         case NF_CT_ZONE_DIR_ORIG:
 202                 seq_printf(s, "zone-orig=%u ", zone->id);
 203                 break;
 204         case NF_CT_ZONE_DIR_REPL:
 205                 seq_printf(s, "zone-reply=%u ", zone->id);
 206                 break;
 207         default:
 208                 break;
 209         }
 210 }
 211 #else
 212 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 213                                 int dir)
 214 {
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 219 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 220 {
 221         struct ct_iter_state *st = s->private;
 222         struct nf_conn_tstamp *tstamp;
 223         s64 delta_time;
 224
 225         tstamp = nf_conn_tstamp_find(ct);
 226         if (tstamp) {
 227                 delta_time = st->time_now - tstamp->start;
 228                 if (delta_time > 0)
 229                         delta_time = div_s64(delta_time, NSEC_PER_SEC);
 230                 else
 231                         delta_time = 0;
 232
 233                 seq_printf(s, "delta-time=%llu ",
 234                            (unsigned long long)delta_time);
 235         }
 236         return;
 237 }
 238 #else
 239 static inline void
 240 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 241 {
 242 }
 243 #endif
 244
 245 static const char* l3proto_name(u16 proto)
 246 {
 247         switch (proto) {
 248         case AF_INET: return "ipv4";
 249         case AF_INET6: return "ipv6";
 250         }
 251
 252         return "unknown";
 253 }
 254
 255 static const char* l4proto_name(u16 proto)
 256 {
 257         switch (proto) {
 258         case IPPROTO_ICMP: return "icmp";
 259         case IPPROTO_TCP: return "tcp";
 260         case IPPROTO_UDP: return "udp";
 261         case IPPROTO_DCCP: return "dccp";
 262         case IPPROTO_GRE: return "gre";
 263         case IPPROTO_SCTP: return "sctp";
 264         case IPPROTO_UDPLITE: return "udplite";
 265         }
 266
 267         return "unknown";
 268 }
 269
 270 /* return 0 on success, 1 in case of error */
 271 static int ct_seq_show(struct seq_file *s, void *v)
 272 {
 273         struct nf_conntrack_tuple_hash *hash = v;
 274         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 275         const struct nf_conntrack_l4proto *l4proto;
 276         struct net *net = seq_file_net(s);
 277         int ret = 0;
 278
 279         WARN_ON(!ct);
 280         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 281                 return 0;
 282
 283         if (nf_ct_should_gc(ct)) {
 284                 nf_ct_kill(ct);
 285                 goto release;
 286         }
 287
 288         /* we only want to print DIR_ORIGINAL */
 289         if (NF_CT_DIRECTION(hash))
 290                 goto release;
 291
 292         if (!net_eq(nf_ct_net(ct), net))
 293                 goto release;
 294
 295         l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct));
 296         WARN_ON(!l4proto);
 297
 298         ret = -ENOSPC;
 299         seq_printf(s, "%-8s %u %-8s %u ",
 300                    l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
 301                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
 302
 303         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
 304                 seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
 305
 306         if (l4proto->print_conntrack)
 307                 l4proto->print_conntrack(s, ct);
 308
 309         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 310                     l4proto);
 311
 312         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 313
 314         if (seq_has_overflowed(s))
 315                 goto release;
 316
 317         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 318                 goto release;
 319
 320         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 321                 seq_puts(s, "[UNREPLIED] ");
 322
 323         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, l4proto);
 324
 325         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 326
 327         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 328                 goto release;
 329
 330         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
 331                 seq_puts(s, "[OFFLOAD] ");
 332         else if (test_bit(IPS_ASSURED_BIT, &ct->status))
 333                 seq_puts(s, "[ASSURED] ");
 334
 335         if (seq_has_overflowed(s))
 336                 goto release;
 337
 338 #if defined(CONFIG_NF_CONNTRACK_MARK)
 339         seq_printf(s, "mark=%u ", ct->mark);
 340 #endif
 341
 342         ct_show_secctx(s, ct);
 343         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 344         ct_show_delta_time(s, ct);
 345
 346         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 347
 348         if (seq_has_overflowed(s))
 349                 goto release;
 350
 351         ret = 0;
 352 release:
 353         nf_ct_put(ct);
 354         return ret;
 355 }
 356
 357 static const struct seq_operations ct_seq_ops = {
 358         .start = ct_seq_start,
 359         .next  = ct_seq_next,
 360         .stop  = ct_seq_stop,
 361         .show  = ct_seq_show
 362 };
 363
 364 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 365 {
 366         struct net *net = seq_file_net(seq);
 367         int cpu;
 368
 369         if (*pos == 0)
 370                 return SEQ_START_TOKEN;
 371
 372         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 373                 if (!cpu_possible(cpu))
 374                         continue;
 375                 *pos = cpu + 1;
 376                 return per_cpu_ptr(net->ct.stat, cpu);
 377         }
 378
 379         return NULL;
 380 }
 381
 382 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 383 {
 384         struct net *net = seq_file_net(seq);
 385         int cpu;
 386
 387         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 388                 if (!cpu_possible(cpu))
 389                         continue;
 390                 *pos = cpu + 1;
 391                 return per_cpu_ptr(net->ct.stat, cpu);
 392         }
 393
 394         return NULL;
 395 }
 396
 397 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 398 {
 399 }
 400
 401 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 402 {
 403         struct net *net = seq_file_net(seq);
 404         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 405         const struct ip_conntrack_stat *st = v;
 406
 407         if (v == SEQ_START_TOKEN) {
 408                 seq_puts(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
 409                 return 0;
 410         }
 411
 412         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 413                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 414                    nr_conntracks,
 415                    0,
 416                    st->found,
 417                    0,
 418                    st->invalid,
 419                    st->ignore,
 420                    0,
 421                    0,
 422                    st->insert,
 423                    st->insert_failed,
 424                    st->drop,
 425                    st->early_drop,
 426                    st->error,
 427
 428                    st->expect_new,
 429                    st->expect_create,
 430                    st->expect_delete,
 431                    st->search_restart
 432                 );
 433         return 0;
 434 }
 435
 436 static const struct seq_operations ct_cpu_seq_ops = {
 437         .start  = ct_cpu_seq_start,
 438         .next   = ct_cpu_seq_next,
 439         .stop   = ct_cpu_seq_stop,
 440         .show   = ct_cpu_seq_show,
 441 };
 442
 443 static int nf_conntrack_standalone_init_proc(struct net *net)
 444 {
 445         struct proc_dir_entry *pde;
 446         kuid_t root_uid;
 447         kgid_t root_gid;
 448
 449         pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
 450                         sizeof(struct ct_iter_state));
 451         if (!pde)
 452                 goto out_nf_conntrack;
 453
 454         root_uid = make_kuid(net->user_ns, 0);
 455         root_gid = make_kgid(net->user_ns, 0);
 456         if (uid_valid(root_uid) && gid_valid(root_gid))
 457                 proc_set_user(pde, root_uid, root_gid);
 458
 459         pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
 460                         &ct_cpu_seq_ops, sizeof(struct seq_net_private));
 461         if (!pde)
 462                 goto out_stat_nf_conntrack;
 463         return 0;
 464
 465 out_stat_nf_conntrack:
 466         remove_proc_entry("nf_conntrack", net->proc_net);
 467 out_nf_conntrack:
 468         return -ENOMEM;
 469 }
 470
 471 static void nf_conntrack_standalone_fini_proc(struct net *net)
 472 {
 473         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 474         remove_proc_entry("nf_conntrack", net->proc_net);
 475 }
 476 #else
 477 static int nf_conntrack_standalone_init_proc(struct net *net)
 478 {
 479         return 0;
 480 }
 481
 482 static void nf_conntrack_standalone_fini_proc(struct net *net)
 483 {
 484 }
 485 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 486
 487 /* Sysctl support */
 488
 489 #ifdef CONFIG_SYSCTL
 490 /* Log invalid packets of a given protocol */
 491 static int log_invalid_proto_min __read_mostly;
 492 static int log_invalid_proto_max __read_mostly = 255;
 493
 494 /* size the user *wants to set */
 495 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 496
 497 static int
 498 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 499                          void __user *buffer, size_t *lenp, loff_t *ppos)
 500 {
 501         int ret;
 502
 503         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 504         if (ret < 0 || !write)
 505                 return ret;
 506
 507         /* update ret, we might not be able to satisfy request */
 508         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 509
 510         /* update it to the actual value used by conntrack */
 511         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 512         return ret;
 513 }
 514
 515 static struct ctl_table_header *nf_ct_netfilter_header;
 516
 517 static struct ctl_table nf_ct_sysctl_table[] = {
 518         {
 519                 .procname       = "nf_conntrack_max",
 520                 .data           = &nf_conntrack_max,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec,
 524         },
 525         {
 526                 .procname       = "nf_conntrack_count",
 527                 .data           = &init_net.ct.count,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0444,
 530                 .proc_handler   = proc_dointvec,
 531         },
 532         {
 533                 .procname       = "nf_conntrack_buckets",
 534                 .data           = &nf_conntrack_htable_size_user,
 535                 .maxlen         = sizeof(unsigned int),
 536                 .mode           = 0644,
 537                 .proc_handler   = nf_conntrack_hash_sysctl,
 538         },
 539         {
 540                 .procname       = "nf_conntrack_checksum",
 541                 .data           = &init_net.ct.sysctl_checksum,
 542                 .maxlen         = sizeof(unsigned int),
 543                 .mode           = 0644,
 544                 .proc_handler   = proc_dointvec,
 545         },
 546         {
 547                 .procname       = "nf_conntrack_log_invalid",
 548                 .data           = &init_net.ct.sysctl_log_invalid,
 549                 .maxlen         = sizeof(unsigned int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec_minmax,
 552                 .extra1         = &log_invalid_proto_min,
 553                 .extra2         = &log_invalid_proto_max,
 554         },
 555         {
 556                 .procname       = "nf_conntrack_expect_max",
 557                 .data           = &nf_ct_expect_max,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_dointvec,
 561         },
 562         { }
 563 };
 564
 565 static struct ctl_table nf_ct_netfilter_table[] = {
 566         {
 567                 .procname       = "nf_conntrack_max",
 568                 .data           = &nf_conntrack_max,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec,
 572         },
 573         { }
 574 };
 575
 576 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 577 {
 578         struct ctl_table *table;
 579
 580         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 581                         GFP_KERNEL);
 582         if (!table)
 583                 goto out_kmemdup;
 584
 585         table[1].data = &net->ct.count;
 586         table[3].data = &net->ct.sysctl_checksum;
 587         table[4].data = &net->ct.sysctl_log_invalid;
 588
 589         /* Don't export sysctls to unprivileged users */
 590         if (net->user_ns != &init_user_ns)
 591                 table[0].procname = NULL;
 592
 593         if (!net_eq(&init_net, net))
 594                 table[2].mode = 0444;
 595
 596         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 597         if (!net->ct.sysctl_header)
 598                 goto out_unregister_netfilter;
 599
 600         return 0;
 601
 602 out_unregister_netfilter:
 603         kfree(table);
 604 out_kmemdup:
 605         return -ENOMEM;
 606 }
 607
 608 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 609 {
 610         struct ctl_table *table;
 611
 612         table = net->ct.sysctl_header->ctl_table_arg;
 613         unregister_net_sysctl_table(net->ct.sysctl_header);
 614         kfree(table);
 615 }
 616 #else
 617 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 618 {
 619         return 0;
 620 }
 621
 622 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 623 {
 624 }
 625 #endif /* CONFIG_SYSCTL */
 626
 627 static int nf_conntrack_pernet_init(struct net *net)
 628 {
 629         int ret;
 630
 631         ret = nf_conntrack_init_net(net);
 632         if (ret < 0)
 633                 goto out_init;
 634
 635         ret = nf_conntrack_standalone_init_proc(net);
 636         if (ret < 0)
 637                 goto out_proc;
 638
 639         net->ct.sysctl_checksum = 1;
 640         net->ct.sysctl_log_invalid = 0;
 641         ret = nf_conntrack_standalone_init_sysctl(net);
 642         if (ret < 0)
 643                 goto out_sysctl;
 644
 645         return 0;
 646
 647 out_sysctl:
 648         nf_conntrack_standalone_fini_proc(net);
 649 out_proc:
 650         nf_conntrack_cleanup_net(net);
 651 out_init:
 652         return ret;
 653 }
 654
 655 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 656 {
 657         struct net *net;
 658
 659         list_for_each_entry(net, net_exit_list, exit_list) {
 660                 nf_conntrack_standalone_fini_sysctl(net);
 661                 nf_conntrack_standalone_fini_proc(net);
 662         }
 663         nf_conntrack_cleanup_net_list(net_exit_list);
 664 }
 665
 666 static struct pernet_operations nf_conntrack_net_ops = {
 667         .init           = nf_conntrack_pernet_init,
 668         .exit_batch     = nf_conntrack_pernet_exit,
 669         .id             = &nf_conntrack_net_id,
 670         .size = sizeof(struct nf_conntrack_net),
 671 };
 672
 673 static int __init nf_conntrack_standalone_init(void)
 674 {
 675         int ret = nf_conntrack_init_start();
 676         if (ret < 0)
 677                 goto out_start;
 678
 679         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 680         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 681
 682 #ifdef CONFIG_SYSCTL
 683         nf_ct_netfilter_header =
 684                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 685         if (!nf_ct_netfilter_header) {
 686                 pr_err("nf_conntrack: can't register to sysctl.\n");
 687                 ret = -ENOMEM;
 688                 goto out_sysctl;
 689         }
 690
 691         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 692 #endif
 693
 694         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 695         if (ret < 0)
 696                 goto out_pernet;
 697
 698         nf_conntrack_init_end();
 699         return 0;
 700
 701 out_pernet:
 702 #ifdef CONFIG_SYSCTL
 703         unregister_net_sysctl_table(nf_ct_netfilter_header);
 704 out_sysctl:
 705 #endif
 706         nf_conntrack_cleanup_end();
 707 out_start:
 708         return ret;
 709 }
 710
 711 static void __exit nf_conntrack_standalone_fini(void)
 712 {
 713         nf_conntrack_cleanup_start();
 714         unregister_pernet_subsys(&nf_conntrack_net_ops);
 715 #ifdef CONFIG_SYSCTL
 716         unregister_net_sysctl_table(nf_ct_netfilter_header);
 717 #endif
 718         nf_conntrack_cleanup_end();
 719 }
 720
 721 module_init(nf_conntrack_standalone_init);
 722 module_exit(nf_conntrack_standalone_fini);