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         case IPPROTO_ICMPV6: return "icmpv6";
 266         }
 267
 268         return "unknown";
 269 }
 270
 271 /* return 0 on success, 1 in case of error */
 272 static int ct_seq_show(struct seq_file *s, void *v)
 273 {
 274         struct nf_conntrack_tuple_hash *hash = v;
 275         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 276         const struct nf_conntrack_l4proto *l4proto;
 277         struct net *net = seq_file_net(s);
 278         int ret = 0;
 279
 280         WARN_ON(!ct);
 281         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 282                 return 0;
 283
 284         if (nf_ct_should_gc(ct)) {
 285                 nf_ct_kill(ct);
 286                 goto release;
 287         }
 288
 289         /* we only want to print DIR_ORIGINAL */
 290         if (NF_CT_DIRECTION(hash))
 291                 goto release;
 292
 293         if (!net_eq(nf_ct_net(ct), net))
 294                 goto release;
 295
 296         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 297         WARN_ON(!l4proto);
 298
 299         ret = -ENOSPC;
 300         seq_printf(s, "%-8s %u %-8s %u ",
 301                    l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
 302                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
 303
 304         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
 305                 seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
 306
 307         if (l4proto->print_conntrack)
 308                 l4proto->print_conntrack(s, ct);
 309
 310         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 311                     l4proto);
 312
 313         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 314
 315         if (seq_has_overflowed(s))
 316                 goto release;
 317
 318         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 319                 goto release;
 320
 321         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 322                 seq_puts(s, "[UNREPLIED] ");
 323
 324         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, l4proto);
 325
 326         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 327
 328         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 329                 goto release;
 330
 331         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
 332                 seq_puts(s, "[OFFLOAD] ");
 333         else if (test_bit(IPS_ASSURED_BIT, &ct->status))
 334                 seq_puts(s, "[ASSURED] ");
 335
 336         if (seq_has_overflowed(s))
 337                 goto release;
 338
 339 #if defined(CONFIG_NF_CONNTRACK_MARK)
 340         seq_printf(s, "mark=%u ", ct->mark);
 341 #endif
 342
 343         ct_show_secctx(s, ct);
 344         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 345         ct_show_delta_time(s, ct);
 346
 347         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 348
 349         if (seq_has_overflowed(s))
 350                 goto release;
 351
 352         ret = 0;
 353 release:
 354         nf_ct_put(ct);
 355         return ret;
 356 }
 357
 358 static const struct seq_operations ct_seq_ops = {
 359         .start = ct_seq_start,
 360         .next  = ct_seq_next,
 361         .stop  = ct_seq_stop,
 362         .show  = ct_seq_show
 363 };
 364
 365 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 366 {
 367         struct net *net = seq_file_net(seq);
 368         int cpu;
 369
 370         if (*pos == 0)
 371                 return SEQ_START_TOKEN;
 372
 373         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 374                 if (!cpu_possible(cpu))
 375                         continue;
 376                 *pos = cpu + 1;
 377                 return per_cpu_ptr(net->ct.stat, cpu);
 378         }
 379
 380         return NULL;
 381 }
 382
 383 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 384 {
 385         struct net *net = seq_file_net(seq);
 386         int cpu;
 387
 388         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 389                 if (!cpu_possible(cpu))
 390                         continue;
 391                 *pos = cpu + 1;
 392                 return per_cpu_ptr(net->ct.stat, cpu);
 393         }
 394         (*pos)++;
 395         return NULL;
 396 }
 397
 398 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 399 {
 400 }
 401
 402 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 403 {
 404         struct net *net = seq_file_net(seq);
 405         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 406         const struct ip_conntrack_stat *st = v;
 407
 408         if (v == SEQ_START_TOKEN) {
 409                 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");
 410                 return 0;
 411         }
 412
 413         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 414                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 415                    nr_conntracks,
 416                    0,
 417                    st->found,
 418                    0,
 419                    st->invalid,
 420                    st->ignore,
 421                    0,
 422                    0,
 423                    st->insert,
 424                    st->insert_failed,
 425                    st->drop,
 426                    st->early_drop,
 427                    st->error,
 428
 429                    st->expect_new,
 430                    st->expect_create,
 431                    st->expect_delete,
 432                    st->search_restart
 433                 );
 434         return 0;
 435 }
 436
 437 static const struct seq_operations ct_cpu_seq_ops = {
 438         .start  = ct_cpu_seq_start,
 439         .next   = ct_cpu_seq_next,
 440         .stop   = ct_cpu_seq_stop,
 441         .show   = ct_cpu_seq_show,
 442 };
 443
 444 static int nf_conntrack_standalone_init_proc(struct net *net)
 445 {
 446         struct proc_dir_entry *pde;
 447         kuid_t root_uid;
 448         kgid_t root_gid;
 449
 450         pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
 451                         sizeof(struct ct_iter_state));
 452         if (!pde)
 453                 goto out_nf_conntrack;
 454
 455         root_uid = make_kuid(net->user_ns, 0);
 456         root_gid = make_kgid(net->user_ns, 0);
 457         if (uid_valid(root_uid) && gid_valid(root_gid))
 458                 proc_set_user(pde, root_uid, root_gid);
 459
 460         pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
 461                         &ct_cpu_seq_ops, sizeof(struct seq_net_private));
 462         if (!pde)
 463                 goto out_stat_nf_conntrack;
 464         return 0;
 465
 466 out_stat_nf_conntrack:
 467         remove_proc_entry("nf_conntrack", net->proc_net);
 468 out_nf_conntrack:
 469         return -ENOMEM;
 470 }
 471
 472 static void nf_conntrack_standalone_fini_proc(struct net *net)
 473 {
 474         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 475         remove_proc_entry("nf_conntrack", net->proc_net);
 476 }
 477 #else
 478 static int nf_conntrack_standalone_init_proc(struct net *net)
 479 {
 480         return 0;
 481 }
 482
 483 static void nf_conntrack_standalone_fini_proc(struct net *net)
 484 {
 485 }
 486 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 487
 488 /* Sysctl support */
 489
 490 #ifdef CONFIG_SYSCTL
 491 /* Log invalid packets of a given protocol */
 492 static int log_invalid_proto_min __read_mostly;
 493 static int log_invalid_proto_max __read_mostly = 255;
 494
 495 /* size the user *wants to set */
 496 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 497
 498 static int
 499 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 500                          void __user *buffer, size_t *lenp, loff_t *ppos)
 501 {
 502         int ret;
 503
 504         /* module_param hashsize could have changed value */
 505         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 506
 507         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 508         if (ret < 0 || !write)
 509                 return ret;
 510
 511         /* update ret, we might not be able to satisfy request */
 512         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 513
 514         /* update it to the actual value used by conntrack */
 515         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 516         return ret;
 517 }
 518
 519 static struct ctl_table_header *nf_ct_netfilter_header;
 520
 521 static struct ctl_table nf_ct_sysctl_table[] = {
 522         {
 523                 .procname       = "nf_conntrack_max",
 524                 .data           = &nf_conntrack_max,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec,
 528         },
 529         {
 530                 .procname       = "nf_conntrack_count",
 531                 .data           = &init_net.ct.count,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0444,
 534                 .proc_handler   = proc_dointvec,
 535         },
 536         {
 537                 .procname       = "nf_conntrack_buckets",
 538                 .data           = &nf_conntrack_htable_size_user,
 539                 .maxlen         = sizeof(unsigned int),
 540                 .mode           = 0644,
 541                 .proc_handler   = nf_conntrack_hash_sysctl,
 542         },
 543         {
 544                 .procname       = "nf_conntrack_checksum",
 545                 .data           = &init_net.ct.sysctl_checksum,
 546                 .maxlen         = sizeof(unsigned int),
 547                 .mode           = 0644,
 548                 .proc_handler   = proc_dointvec,
 549         },
 550         {
 551                 .procname       = "nf_conntrack_log_invalid",
 552                 .data           = &init_net.ct.sysctl_log_invalid,
 553                 .maxlen         = sizeof(unsigned int),
 554                 .mode           = 0644,
 555                 .proc_handler   = proc_dointvec_minmax,
 556                 .extra1         = &log_invalid_proto_min,
 557                 .extra2         = &log_invalid_proto_max,
 558         },
 559         {
 560                 .procname       = "nf_conntrack_expect_max",
 561                 .data           = &nf_ct_expect_max,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566         { }
 567 };
 568
 569 static struct ctl_table nf_ct_netfilter_table[] = {
 570         {
 571                 .procname       = "nf_conntrack_max",
 572                 .data           = &nf_conntrack_max,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_dointvec,
 576         },
 577         { }
 578 };
 579
 580 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 581 {
 582         struct ctl_table *table;
 583
 584         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 585                         GFP_KERNEL);
 586         if (!table)
 587                 goto out_kmemdup;
 588
 589         table[1].data = &net->ct.count;
 590         table[3].data = &net->ct.sysctl_checksum;
 591         table[4].data = &net->ct.sysctl_log_invalid;
 592
 593         /* Don't export sysctls to unprivileged users */
 594         if (net->user_ns != &init_user_ns)
 595                 table[0].procname = NULL;
 596
 597         if (!net_eq(&init_net, net)) {
 598                 table[0].mode = 0444;
 599                 table[2].mode = 0444;
 600                 table[5].mode = 0444;
 601         }
 602
 603         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 604         if (!net->ct.sysctl_header)
 605                 goto out_unregister_netfilter;
 606
 607         return 0;
 608
 609 out_unregister_netfilter:
 610         kfree(table);
 611 out_kmemdup:
 612         return -ENOMEM;
 613 }
 614
 615 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 616 {
 617         struct ctl_table *table;
 618
 619         table = net->ct.sysctl_header->ctl_table_arg;
 620         unregister_net_sysctl_table(net->ct.sysctl_header);
 621         kfree(table);
 622 }
 623 #else
 624 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 625 {
 626         return 0;
 627 }
 628
 629 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 630 {
 631 }
 632 #endif /* CONFIG_SYSCTL */
 633
 634 static int nf_conntrack_pernet_init(struct net *net)
 635 {
 636         int ret;
 637
 638         ret = nf_conntrack_init_net(net);
 639         if (ret < 0)
 640                 goto out_init;
 641
 642         ret = nf_conntrack_standalone_init_proc(net);
 643         if (ret < 0)
 644                 goto out_proc;
 645
 646         net->ct.sysctl_checksum = 1;
 647         net->ct.sysctl_log_invalid = 0;
 648         ret = nf_conntrack_standalone_init_sysctl(net);
 649         if (ret < 0)
 650                 goto out_sysctl;
 651
 652         return 0;
 653
 654 out_sysctl:
 655         nf_conntrack_standalone_fini_proc(net);
 656 out_proc:
 657         nf_conntrack_cleanup_net(net);
 658 out_init:
 659         return ret;
 660 }
 661
 662 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 663 {
 664         struct net *net;
 665
 666         list_for_each_entry(net, net_exit_list, exit_list) {
 667                 nf_conntrack_standalone_fini_sysctl(net);
 668                 nf_conntrack_standalone_fini_proc(net);
 669         }
 670         nf_conntrack_cleanup_net_list(net_exit_list);
 671 }
 672
 673 static struct pernet_operations nf_conntrack_net_ops = {
 674         .init           = nf_conntrack_pernet_init,
 675         .exit_batch     = nf_conntrack_pernet_exit,
 676         .id             = &nf_conntrack_net_id,
 677         .size = sizeof(struct nf_conntrack_net),
 678 };
 679
 680 static int __init nf_conntrack_standalone_init(void)
 681 {
 682         int ret = nf_conntrack_init_start();
 683         if (ret < 0)
 684                 goto out_start;
 685
 686         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 687         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 688
 689 #ifdef CONFIG_SYSCTL
 690         nf_ct_netfilter_header =
 691                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 692         if (!nf_ct_netfilter_header) {
 693                 pr_err("nf_conntrack: can't register to sysctl.\n");
 694                 ret = -ENOMEM;
 695                 goto out_sysctl;
 696         }
 697
 698         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 699 #endif
 700
 701         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 702         if (ret < 0)
 703                 goto out_pernet;
 704
 705         nf_conntrack_init_end();
 706         return 0;
 707
 708 out_pernet:
 709 #ifdef CONFIG_SYSCTL
 710         unregister_net_sysctl_table(nf_ct_netfilter_header);
 711 out_sysctl:
 712 #endif
 713         nf_conntrack_cleanup_end();
 714 out_start:
 715         return ret;
 716 }
 717
 718 static void __exit nf_conntrack_standalone_fini(void)
 719 {
 720         nf_conntrack_cleanup_start();
 721         unregister_pernet_subsys(&nf_conntrack_net_ops);
 722 #ifdef CONFIG_SYSCTL
 723         unregister_net_sysctl_table(nf_ct_netfilter_header);
 724 #endif
 725         nf_conntrack_cleanup_end();
 726 }
 727
 728 module_init(nf_conntrack_standalone_init);
 729 module_exit(nf_conntrack_standalone_fini);
 730
 731 /* Some modules need us, but don't depend directly on any symbol.
 732    They should call this. */
 733 void need_conntrack(void)
 734 {
 735 }
 736 EXPORT_SYMBOL_GPL(need_conntrack);