net/netfilter/nf_conntrack_standalone.c

   1 /* (C) 1999-2001 Paul `Rusty' Russell
   2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   3  * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/netfilter.h>
  12 #include <linux/slab.h>
  13 #include <linux/module.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/percpu.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/security.h>
  20 #include <net/net_namespace.h>
  21 #ifdef CONFIG_SYSCTL
  22 #include <linux/sysctl.h>
  23 #endif
  24
  25 #include <net/netfilter/nf_conntrack.h>
  26 #include <net/netfilter/nf_conntrack_core.h>
  27 #include <net/netfilter/nf_conntrack_l3proto.h>
  28 #include <net/netfilter/nf_conntrack_l4proto.h>
  29 #include <net/netfilter/nf_conntrack_expect.h>
  30 #include <net/netfilter/nf_conntrack_helper.h>
  31 #include <net/netfilter/nf_conntrack_acct.h>
  32 #include <net/netfilter/nf_conntrack_zones.h>
  33 #include <net/netfilter/nf_conntrack_timestamp.h>
  34 #include <linux/rculist_nulls.h>
  35
  36 MODULE_LICENSE("GPL");
  37
  38 #ifdef CONFIG_NF_CONNTRACK_PROCFS
  39 void
  40 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  41             const struct nf_conntrack_l3proto *l3proto,
  42             const struct nf_conntrack_l4proto *l4proto)
  43 {
  44         switch (l3proto->l3proto) {
  45         case NFPROTO_IPV4:
  46                 seq_printf(s, "src=%pI4 dst=%pI4 ",
  47                            &tuple->src.u3.ip, &tuple->dst.u3.ip);
  48                 break;
  49         case NFPROTO_IPV6:
  50                 seq_printf(s, "src=%pI6 dst=%pI6 ",
  51                            tuple->src.u3.ip6, tuple->dst.u3.ip6);
  52                 break;
  53         default:
  54                 break;
  55         }
  56
  57         switch (l4proto->l4proto) {
  58         case IPPROTO_ICMP:
  59                 seq_printf(s, "type=%u code=%u id=%u ",
  60                            tuple->dst.u.icmp.type,
  61                            tuple->dst.u.icmp.code,
  62                            ntohs(tuple->src.u.icmp.id));
  63                 break;
  64         case IPPROTO_TCP:
  65                 seq_printf(s, "sport=%hu dport=%hu ",
  66                            ntohs(tuple->src.u.tcp.port),
  67                            ntohs(tuple->dst.u.tcp.port));
  68                 break;
  69         case IPPROTO_UDPLITE: /* fallthrough */
  70         case IPPROTO_UDP:
  71                 seq_printf(s, "sport=%hu dport=%hu ",
  72                            ntohs(tuple->src.u.udp.port),
  73                            ntohs(tuple->dst.u.udp.port));
  74
  75                 break;
  76         case IPPROTO_DCCP:
  77                 seq_printf(s, "sport=%hu dport=%hu ",
  78                            ntohs(tuple->src.u.dccp.port),
  79                            ntohs(tuple->dst.u.dccp.port));
  80                 break;
  81         case IPPROTO_SCTP:
  82                 seq_printf(s, "sport=%hu dport=%hu ",
  83                            ntohs(tuple->src.u.sctp.port),
  84                            ntohs(tuple->dst.u.sctp.port));
  85                 break;
  86         case IPPROTO_ICMPV6:
  87                 seq_printf(s, "type=%u code=%u id=%u ",
  88                            tuple->dst.u.icmp.type,
  89                            tuple->dst.u.icmp.code,
  90                            ntohs(tuple->src.u.icmp.id));
  91                 break;
  92         case IPPROTO_GRE:
  93                 seq_printf(s, "srckey=0x%x dstkey=0x%x ",
  94                            ntohs(tuple->src.u.gre.key),
  95                            ntohs(tuple->dst.u.gre.key));
  96                 break;
  97         default:
  98                 break;
  99         }
 100 }
 101 EXPORT_SYMBOL_GPL(print_tuple);
 102
 103 struct ct_iter_state {
 104         struct seq_net_private p;
 105         struct hlist_nulls_head *hash;
 106         unsigned int htable_size;
 107         unsigned int bucket;
 108         u_int64_t time_now;
 109 };
 110
 111 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 112 {
 113         struct ct_iter_state *st = seq->private;
 114         struct hlist_nulls_node *n;
 115
 116         for (st->bucket = 0;
 117              st->bucket < st->htable_size;
 118              st->bucket++) {
 119                 n = rcu_dereference(
 120                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 121                 if (!is_a_nulls(n))
 122                         return n;
 123         }
 124         return NULL;
 125 }
 126
 127 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 128                                       struct hlist_nulls_node *head)
 129 {
 130         struct ct_iter_state *st = seq->private;
 131
 132         head = rcu_dereference(hlist_nulls_next_rcu(head));
 133         while (is_a_nulls(head)) {
 134                 if (likely(get_nulls_value(head) == st->bucket)) {
 135                         if (++st->bucket >= st->htable_size)
 136                                 return NULL;
 137                 }
 138                 head = rcu_dereference(
 139                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 140         }
 141         return head;
 142 }
 143
 144 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 145 {
 146         struct hlist_nulls_node *head = ct_get_first(seq);
 147
 148         if (head)
 149                 while (pos && (head = ct_get_next(seq, head)))
 150                         pos--;
 151         return pos ? NULL : head;
 152 }
 153
 154 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 155         __acquires(RCU)
 156 {
 157         struct ct_iter_state *st = seq->private;
 158
 159         st->time_now = ktime_get_real_ns();
 160         rcu_read_lock();
 161
 162         nf_conntrack_get_ht(&st->hash, &st->htable_size);
 163         return ct_get_idx(seq, *pos);
 164 }
 165
 166 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 167 {
 168         (*pos)++;
 169         return ct_get_next(s, v);
 170 }
 171
 172 static void ct_seq_stop(struct seq_file *s, void *v)
 173         __releases(RCU)
 174 {
 175         rcu_read_unlock();
 176 }
 177
 178 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 179 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 180 {
 181         int ret;
 182         u32 len;
 183         char *secctx;
 184
 185         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 186         if (ret)
 187                 return;
 188
 189         seq_printf(s, "secctx=%s ", secctx);
 190
 191         security_release_secctx(secctx, len);
 192 }
 193 #else
 194 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 195 {
 196 }
 197 #endif
 198
 199 #ifdef CONFIG_NF_CONNTRACK_ZONES
 200 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 201                          int dir)
 202 {
 203         const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
 204
 205         if (zone->dir != dir)
 206                 return;
 207         switch (zone->dir) {
 208         case NF_CT_DEFAULT_ZONE_DIR:
 209                 seq_printf(s, "zone=%u ", zone->id);
 210                 break;
 211         case NF_CT_ZONE_DIR_ORIG:
 212                 seq_printf(s, "zone-orig=%u ", zone->id);
 213                 break;
 214         case NF_CT_ZONE_DIR_REPL:
 215                 seq_printf(s, "zone-reply=%u ", zone->id);
 216                 break;
 217         default:
 218                 break;
 219         }
 220 }
 221 #else
 222 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 223                                 int dir)
 224 {
 225 }
 226 #endif
 227
 228 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 229 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 230 {
 231         struct ct_iter_state *st = s->private;
 232         struct nf_conn_tstamp *tstamp;
 233         s64 delta_time;
 234
 235         tstamp = nf_conn_tstamp_find(ct);
 236         if (tstamp) {
 237                 delta_time = st->time_now - tstamp->start;
 238                 if (delta_time > 0)
 239                         delta_time = div_s64(delta_time, NSEC_PER_SEC);
 240                 else
 241                         delta_time = 0;
 242
 243                 seq_printf(s, "delta-time=%llu ",
 244                            (unsigned long long)delta_time);
 245         }
 246         return;
 247 }
 248 #else
 249 static inline void
 250 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 251 {
 252 }
 253 #endif
 254
 255 static const char* l3proto_name(u16 proto)
 256 {
 257         switch (proto) {
 258         case AF_INET: return "ipv4";
 259         case AF_INET6: return "ipv6";
 260         }
 261
 262         return "unknown";
 263 }
 264
 265 static const char* l4proto_name(u16 proto)
 266 {
 267         switch (proto) {
 268         case IPPROTO_ICMP: return "icmp";
 269         case IPPROTO_TCP: return "tcp";
 270         case IPPROTO_UDP: return "udp";
 271         case IPPROTO_DCCP: return "dccp";
 272         case IPPROTO_GRE: return "gre";
 273         case IPPROTO_SCTP: return "sctp";
 274         case IPPROTO_UDPLITE: return "udplite";
 275         }
 276
 277         return "unknown";
 278 }
 279
 280 /* return 0 on success, 1 in case of error */
 281 static int ct_seq_show(struct seq_file *s, void *v)
 282 {
 283         struct nf_conntrack_tuple_hash *hash = v;
 284         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 285         const struct nf_conntrack_l3proto *l3proto;
 286         const struct nf_conntrack_l4proto *l4proto;
 287         struct net *net = seq_file_net(s);
 288         int ret = 0;
 289
 290         WARN_ON(!ct);
 291         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 292                 return 0;
 293
 294         if (nf_ct_should_gc(ct)) {
 295                 nf_ct_kill(ct);
 296                 goto release;
 297         }
 298
 299         /* we only want to print DIR_ORIGINAL */
 300         if (NF_CT_DIRECTION(hash))
 301                 goto release;
 302
 303         if (!net_eq(nf_ct_net(ct), net))
 304                 goto release;
 305
 306         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 307         WARN_ON(!l3proto);
 308         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 309         WARN_ON(!l4proto);
 310
 311         ret = -ENOSPC;
 312         seq_printf(s, "%-8s %u %-8s %u ",
 313                    l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
 314                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
 315
 316         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
 317                 seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
 318
 319         if (l4proto->print_conntrack)
 320                 l4proto->print_conntrack(s, ct);
 321
 322         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 323                     l3proto, l4proto);
 324
 325         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 326
 327         if (seq_has_overflowed(s))
 328                 goto release;
 329
 330         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 331                 goto release;
 332
 333         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 334                 seq_puts(s, "[UNREPLIED] ");
 335
 336         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 337                     l3proto, l4proto);
 338
 339         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 340
 341         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 342                 goto release;
 343
 344         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
 345                 seq_puts(s, "[OFFLOAD] ");
 346         else if (test_bit(IPS_ASSURED_BIT, &ct->status))
 347                 seq_puts(s, "[ASSURED] ");
 348
 349         if (seq_has_overflowed(s))
 350                 goto release;
 351
 352 #if defined(CONFIG_NF_CONNTRACK_MARK)
 353         seq_printf(s, "mark=%u ", ct->mark);
 354 #endif
 355
 356         ct_show_secctx(s, ct);
 357         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 358         ct_show_delta_time(s, ct);
 359
 360         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 361
 362         if (seq_has_overflowed(s))
 363                 goto release;
 364
 365         ret = 0;
 366 release:
 367         nf_ct_put(ct);
 368         return ret;
 369 }
 370
 371 static const struct seq_operations ct_seq_ops = {
 372         .start = ct_seq_start,
 373         .next  = ct_seq_next,
 374         .stop  = ct_seq_stop,
 375         .show  = ct_seq_show
 376 };
 377
 378 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 379 {
 380         struct net *net = seq_file_net(seq);
 381         int cpu;
 382
 383         if (*pos == 0)
 384                 return SEQ_START_TOKEN;
 385
 386         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 387                 if (!cpu_possible(cpu))
 388                         continue;
 389                 *pos = cpu + 1;
 390                 return per_cpu_ptr(net->ct.stat, cpu);
 391         }
 392
 393         return NULL;
 394 }
 395
 396 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 397 {
 398         struct net *net = seq_file_net(seq);
 399         int cpu;
 400
 401         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 402                 if (!cpu_possible(cpu))
 403                         continue;
 404                 *pos = cpu + 1;
 405                 return per_cpu_ptr(net->ct.stat, cpu);
 406         }
 407
 408         return NULL;
 409 }
 410
 411 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 412 {
 413 }
 414
 415 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 416 {
 417         struct net *net = seq_file_net(seq);
 418         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 419         const struct ip_conntrack_stat *st = v;
 420
 421         if (v == SEQ_START_TOKEN) {
 422                 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");
 423                 return 0;
 424         }
 425
 426         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 427                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 428                    nr_conntracks,
 429                    0,
 430                    st->found,
 431                    0,
 432                    st->invalid,
 433                    st->ignore,
 434                    0,
 435                    0,
 436                    st->insert,
 437                    st->insert_failed,
 438                    st->drop,
 439                    st->early_drop,
 440                    st->error,
 441
 442                    st->expect_new,
 443                    st->expect_create,
 444                    st->expect_delete,
 445                    st->search_restart
 446                 );
 447         return 0;
 448 }
 449
 450 static const struct seq_operations ct_cpu_seq_ops = {
 451         .start  = ct_cpu_seq_start,
 452         .next   = ct_cpu_seq_next,
 453         .stop   = ct_cpu_seq_stop,
 454         .show   = ct_cpu_seq_show,
 455 };
 456
 457 static int nf_conntrack_standalone_init_proc(struct net *net)
 458 {
 459         struct proc_dir_entry *pde;
 460         kuid_t root_uid;
 461         kgid_t root_gid;
 462
 463         pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
 464                         sizeof(struct ct_iter_state));
 465         if (!pde)
 466                 goto out_nf_conntrack;
 467
 468         root_uid = make_kuid(net->user_ns, 0);
 469         root_gid = make_kgid(net->user_ns, 0);
 470         if (uid_valid(root_uid) && gid_valid(root_gid))
 471                 proc_set_user(pde, root_uid, root_gid);
 472
 473         pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
 474                         &ct_cpu_seq_ops, sizeof(struct seq_net_private));
 475         if (!pde)
 476                 goto out_stat_nf_conntrack;
 477         return 0;
 478
 479 out_stat_nf_conntrack:
 480         remove_proc_entry("nf_conntrack", net->proc_net);
 481 out_nf_conntrack:
 482         return -ENOMEM;
 483 }
 484
 485 static void nf_conntrack_standalone_fini_proc(struct net *net)
 486 {
 487         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 488         remove_proc_entry("nf_conntrack", net->proc_net);
 489 }
 490 #else
 491 static int nf_conntrack_standalone_init_proc(struct net *net)
 492 {
 493         return 0;
 494 }
 495
 496 static void nf_conntrack_standalone_fini_proc(struct net *net)
 497 {
 498 }
 499 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 500
 501 /* Sysctl support */
 502
 503 #ifdef CONFIG_SYSCTL
 504 /* Log invalid packets of a given protocol */
 505 static int log_invalid_proto_min __read_mostly;
 506 static int log_invalid_proto_max __read_mostly = 255;
 507
 508 /* size the user *wants to set */
 509 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 510
 511 static int
 512 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 513                          void __user *buffer, size_t *lenp, loff_t *ppos)
 514 {
 515         int ret;
 516
 517         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 518         if (ret < 0 || !write)
 519                 return ret;
 520
 521         /* update ret, we might not be able to satisfy request */
 522         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 523
 524         /* update it to the actual value used by conntrack */
 525         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 526         return ret;
 527 }
 528
 529 static struct ctl_table_header *nf_ct_netfilter_header;
 530
 531 static struct ctl_table nf_ct_sysctl_table[] = {
 532         {
 533                 .procname       = "nf_conntrack_max",
 534                 .data           = &nf_conntrack_max,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec,
 538         },
 539         {
 540                 .procname       = "nf_conntrack_count",
 541                 .data           = &init_net.ct.count,
 542                 .maxlen         = sizeof(int),
 543                 .mode           = 0444,
 544                 .proc_handler   = proc_dointvec,
 545         },
 546         {
 547                 .procname       = "nf_conntrack_buckets",
 548                 .data           = &nf_conntrack_htable_size_user,
 549                 .maxlen         = sizeof(unsigned int),
 550                 .mode           = 0644,
 551                 .proc_handler   = nf_conntrack_hash_sysctl,
 552         },
 553         {
 554                 .procname       = "nf_conntrack_checksum",
 555                 .data           = &init_net.ct.sysctl_checksum,
 556                 .maxlen         = sizeof(unsigned int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec,
 559         },
 560         {
 561                 .procname       = "nf_conntrack_log_invalid",
 562                 .data           = &init_net.ct.sysctl_log_invalid,
 563                 .maxlen         = sizeof(unsigned int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec_minmax,
 566                 .extra1         = &log_invalid_proto_min,
 567                 .extra2         = &log_invalid_proto_max,
 568         },
 569         {
 570                 .procname       = "nf_conntrack_expect_max",
 571                 .data           = &nf_ct_expect_max,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_dointvec,
 575         },
 576         { }
 577 };
 578
 579 static struct ctl_table nf_ct_netfilter_table[] = {
 580         {
 581                 .procname       = "nf_conntrack_max",
 582                 .data           = &nf_conntrack_max,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec,
 586         },
 587         { }
 588 };
 589
 590 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 591 {
 592         struct ctl_table *table;
 593
 594         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 595                         GFP_KERNEL);
 596         if (!table)
 597                 goto out_kmemdup;
 598
 599         table[1].data = &net->ct.count;
 600         table[3].data = &net->ct.sysctl_checksum;
 601         table[4].data = &net->ct.sysctl_log_invalid;
 602
 603         /* Don't export sysctls to unprivileged users */
 604         if (net->user_ns != &init_user_ns)
 605                 table[0].procname = NULL;
 606
 607         if (!net_eq(&init_net, net))
 608                 table[2].mode = 0444;
 609
 610         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 611         if (!net->ct.sysctl_header)
 612                 goto out_unregister_netfilter;
 613
 614         return 0;
 615
 616 out_unregister_netfilter:
 617         kfree(table);
 618 out_kmemdup:
 619         return -ENOMEM;
 620 }
 621
 622 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 623 {
 624         struct ctl_table *table;
 625
 626         table = net->ct.sysctl_header->ctl_table_arg;
 627         unregister_net_sysctl_table(net->ct.sysctl_header);
 628         kfree(table);
 629 }
 630 #else
 631 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 632 {
 633         return 0;
 634 }
 635
 636 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 637 {
 638 }
 639 #endif /* CONFIG_SYSCTL */
 640
 641 static int nf_conntrack_pernet_init(struct net *net)
 642 {
 643         int ret;
 644
 645         ret = nf_conntrack_init_net(net);
 646         if (ret < 0)
 647                 goto out_init;
 648
 649         ret = nf_conntrack_standalone_init_proc(net);
 650         if (ret < 0)
 651                 goto out_proc;
 652
 653         net->ct.sysctl_checksum = 1;
 654         net->ct.sysctl_log_invalid = 0;
 655         ret = nf_conntrack_standalone_init_sysctl(net);
 656         if (ret < 0)
 657                 goto out_sysctl;
 658
 659         return 0;
 660
 661 out_sysctl:
 662         nf_conntrack_standalone_fini_proc(net);
 663 out_proc:
 664         nf_conntrack_cleanup_net(net);
 665 out_init:
 666         return ret;
 667 }
 668
 669 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 670 {
 671         struct net *net;
 672
 673         list_for_each_entry(net, net_exit_list, exit_list) {
 674                 nf_conntrack_standalone_fini_sysctl(net);
 675                 nf_conntrack_standalone_fini_proc(net);
 676         }
 677         nf_conntrack_cleanup_net_list(net_exit_list);
 678 }
 679
 680 static struct pernet_operations nf_conntrack_net_ops = {
 681         .init           = nf_conntrack_pernet_init,
 682         .exit_batch     = nf_conntrack_pernet_exit,
 683 };
 684
 685 static int __init nf_conntrack_standalone_init(void)
 686 {
 687         int ret = nf_conntrack_init_start();
 688         if (ret < 0)
 689                 goto out_start;
 690
 691         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 692         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 693
 694 #ifdef CONFIG_SYSCTL
 695         nf_ct_netfilter_header =
 696                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 697         if (!nf_ct_netfilter_header) {
 698                 pr_err("nf_conntrack: can't register to sysctl.\n");
 699                 ret = -ENOMEM;
 700                 goto out_sysctl;
 701         }
 702
 703         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 704 #endif
 705
 706         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 707         if (ret < 0)
 708                 goto out_pernet;
 709
 710         nf_conntrack_init_end();
 711         return 0;
 712
 713 out_pernet:
 714 #ifdef CONFIG_SYSCTL
 715         unregister_net_sysctl_table(nf_ct_netfilter_header);
 716 out_sysctl:
 717 #endif
 718         nf_conntrack_cleanup_end();
 719 out_start:
 720         return ret;
 721 }
 722
 723 static void __exit nf_conntrack_standalone_fini(void)
 724 {
 725         nf_conntrack_cleanup_start();
 726         unregister_pernet_subsys(&nf_conntrack_net_ops);
 727 #ifdef CONFIG_SYSCTL
 728         unregister_net_sysctl_table(nf_ct_netfilter_header);
 729 #endif
 730         nf_conntrack_cleanup_end();
 731 }
 732
 733 module_init(nf_conntrack_standalone_init);
 734 module_exit(nf_conntrack_standalone_fini);
 735
 736 /* Some modules need us, but don't depend directly on any symbol.
 737    They should call this. */
 738 void need_conntrack(void)
 739 {
 740 }
 741 EXPORT_SYMBOL_GPL(need_conntrack);