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 %ld ",
 313                    l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
 314                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct),
 315                    nf_ct_expires(ct)  / HZ);
 316
 317         if (l4proto->print_conntrack)
 318                 l4proto->print_conntrack(s, ct);
 319
 320         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 321                     l3proto, l4proto);
 322
 323         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 324
 325         if (seq_has_overflowed(s))
 326                 goto release;
 327
 328         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 329                 goto release;
 330
 331         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 332                 seq_puts(s, "[UNREPLIED] ");
 333
 334         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 335                     l3proto, l4proto);
 336
 337         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 338
 339         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 340                 goto release;
 341
 342         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 343                 seq_puts(s, "[ASSURED] ");
 344
 345         if (seq_has_overflowed(s))
 346                 goto release;
 347
 348 #if defined(CONFIG_NF_CONNTRACK_MARK)
 349         seq_printf(s, "mark=%u ", ct->mark);
 350 #endif
 351
 352         ct_show_secctx(s, ct);
 353         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 354         ct_show_delta_time(s, ct);
 355
 356         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 357
 358         if (seq_has_overflowed(s))
 359                 goto release;
 360
 361         ret = 0;
 362 release:
 363         nf_ct_put(ct);
 364         return ret;
 365 }
 366
 367 static const struct seq_operations ct_seq_ops = {
 368         .start = ct_seq_start,
 369         .next  = ct_seq_next,
 370         .stop  = ct_seq_stop,
 371         .show  = ct_seq_show
 372 };
 373
 374 static int ct_open(struct inode *inode, struct file *file)
 375 {
 376         return seq_open_net(inode, file, &ct_seq_ops,
 377                         sizeof(struct ct_iter_state));
 378 }
 379
 380 static const struct file_operations ct_file_ops = {
 381         .owner   = THIS_MODULE,
 382         .open    = ct_open,
 383         .read    = seq_read,
 384         .llseek  = seq_lseek,
 385         .release = seq_release_net,
 386 };
 387
 388 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 389 {
 390         struct net *net = seq_file_net(seq);
 391         int cpu;
 392
 393         if (*pos == 0)
 394                 return SEQ_START_TOKEN;
 395
 396         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 397                 if (!cpu_possible(cpu))
 398                         continue;
 399                 *pos = cpu + 1;
 400                 return per_cpu_ptr(net->ct.stat, cpu);
 401         }
 402
 403         return NULL;
 404 }
 405
 406 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 407 {
 408         struct net *net = seq_file_net(seq);
 409         int cpu;
 410
 411         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 412                 if (!cpu_possible(cpu))
 413                         continue;
 414                 *pos = cpu + 1;
 415                 return per_cpu_ptr(net->ct.stat, cpu);
 416         }
 417
 418         return NULL;
 419 }
 420
 421 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 422 {
 423 }
 424
 425 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 426 {
 427         struct net *net = seq_file_net(seq);
 428         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 429         const struct ip_conntrack_stat *st = v;
 430
 431         if (v == SEQ_START_TOKEN) {
 432                 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");
 433                 return 0;
 434         }
 435
 436         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 437                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 438                    nr_conntracks,
 439                    0,
 440                    st->found,
 441                    0,
 442                    st->invalid,
 443                    st->ignore,
 444                    0,
 445                    0,
 446                    st->insert,
 447                    st->insert_failed,
 448                    st->drop,
 449                    st->early_drop,
 450                    st->error,
 451
 452                    st->expect_new,
 453                    st->expect_create,
 454                    st->expect_delete,
 455                    st->search_restart
 456                 );
 457         return 0;
 458 }
 459
 460 static const struct seq_operations ct_cpu_seq_ops = {
 461         .start  = ct_cpu_seq_start,
 462         .next   = ct_cpu_seq_next,
 463         .stop   = ct_cpu_seq_stop,
 464         .show   = ct_cpu_seq_show,
 465 };
 466
 467 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 468 {
 469         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 470                             sizeof(struct seq_net_private));
 471 }
 472
 473 static const struct file_operations ct_cpu_seq_fops = {
 474         .owner   = THIS_MODULE,
 475         .open    = ct_cpu_seq_open,
 476         .read    = seq_read,
 477         .llseek  = seq_lseek,
 478         .release = seq_release_net,
 479 };
 480
 481 static int nf_conntrack_standalone_init_proc(struct net *net)
 482 {
 483         struct proc_dir_entry *pde;
 484         kuid_t root_uid;
 485         kgid_t root_gid;
 486
 487         pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
 488         if (!pde)
 489                 goto out_nf_conntrack;
 490
 491         root_uid = make_kuid(net->user_ns, 0);
 492         root_gid = make_kgid(net->user_ns, 0);
 493         if (uid_valid(root_uid) && gid_valid(root_gid))
 494                 proc_set_user(pde, root_uid, root_gid);
 495
 496         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
 497                           &ct_cpu_seq_fops);
 498         if (!pde)
 499                 goto out_stat_nf_conntrack;
 500         return 0;
 501
 502 out_stat_nf_conntrack:
 503         remove_proc_entry("nf_conntrack", net->proc_net);
 504 out_nf_conntrack:
 505         return -ENOMEM;
 506 }
 507
 508 static void nf_conntrack_standalone_fini_proc(struct net *net)
 509 {
 510         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 511         remove_proc_entry("nf_conntrack", net->proc_net);
 512 }
 513 #else
 514 static int nf_conntrack_standalone_init_proc(struct net *net)
 515 {
 516         return 0;
 517 }
 518
 519 static void nf_conntrack_standalone_fini_proc(struct net *net)
 520 {
 521 }
 522 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 523
 524 /* Sysctl support */
 525
 526 #ifdef CONFIG_SYSCTL
 527 /* Log invalid packets of a given protocol */
 528 static int log_invalid_proto_min __read_mostly;
 529 static int log_invalid_proto_max __read_mostly = 255;
 530
 531 /* size the user *wants to set */
 532 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 533
 534 static int
 535 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 536                          void __user *buffer, size_t *lenp, loff_t *ppos)
 537 {
 538         int ret;
 539
 540         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 541         if (ret < 0 || !write)
 542                 return ret;
 543
 544         /* update ret, we might not be able to satisfy request */
 545         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 546
 547         /* update it to the actual value used by conntrack */
 548         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 549         return ret;
 550 }
 551
 552 static struct ctl_table_header *nf_ct_netfilter_header;
 553
 554 static struct ctl_table nf_ct_sysctl_table[] = {
 555         {
 556                 .procname       = "nf_conntrack_max",
 557                 .data           = &nf_conntrack_max,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_dointvec,
 561         },
 562         {
 563                 .procname       = "nf_conntrack_count",
 564                 .data           = &init_net.ct.count,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0444,
 567                 .proc_handler   = proc_dointvec,
 568         },
 569         {
 570                 .procname       = "nf_conntrack_buckets",
 571                 .data           = &nf_conntrack_htable_size_user,
 572                 .maxlen         = sizeof(unsigned int),
 573                 .mode           = 0644,
 574                 .proc_handler   = nf_conntrack_hash_sysctl,
 575         },
 576         {
 577                 .procname       = "nf_conntrack_checksum",
 578                 .data           = &init_net.ct.sysctl_checksum,
 579                 .maxlen         = sizeof(unsigned int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583         {
 584                 .procname       = "nf_conntrack_log_invalid",
 585                 .data           = &init_net.ct.sysctl_log_invalid,
 586                 .maxlen         = sizeof(unsigned int),
 587                 .mode           = 0644,
 588                 .proc_handler   = proc_dointvec_minmax,
 589                 .extra1         = &log_invalid_proto_min,
 590                 .extra2         = &log_invalid_proto_max,
 591         },
 592         {
 593                 .procname       = "nf_conntrack_expect_max",
 594                 .data           = &nf_ct_expect_max,
 595                 .maxlen         = sizeof(int),
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dointvec,
 598         },
 599         { }
 600 };
 601
 602 static struct ctl_table nf_ct_netfilter_table[] = {
 603         {
 604                 .procname       = "nf_conntrack_max",
 605                 .data           = &nf_conntrack_max,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = proc_dointvec,
 609         },
 610         { }
 611 };
 612
 613 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 614 {
 615         struct ctl_table *table;
 616
 617         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 618                         GFP_KERNEL);
 619         if (!table)
 620                 goto out_kmemdup;
 621
 622         table[1].data = &net->ct.count;
 623         table[3].data = &net->ct.sysctl_checksum;
 624         table[4].data = &net->ct.sysctl_log_invalid;
 625
 626         /* Don't export sysctls to unprivileged users */
 627         if (net->user_ns != &init_user_ns)
 628                 table[0].procname = NULL;
 629
 630         if (!net_eq(&init_net, net))
 631                 table[2].mode = 0444;
 632
 633         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 634         if (!net->ct.sysctl_header)
 635                 goto out_unregister_netfilter;
 636
 637         return 0;
 638
 639 out_unregister_netfilter:
 640         kfree(table);
 641 out_kmemdup:
 642         return -ENOMEM;
 643 }
 644
 645 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 646 {
 647         struct ctl_table *table;
 648
 649         table = net->ct.sysctl_header->ctl_table_arg;
 650         unregister_net_sysctl_table(net->ct.sysctl_header);
 651         kfree(table);
 652 }
 653 #else
 654 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 655 {
 656         return 0;
 657 }
 658
 659 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 660 {
 661 }
 662 #endif /* CONFIG_SYSCTL */
 663
 664 static int nf_conntrack_pernet_init(struct net *net)
 665 {
 666         int ret;
 667
 668         ret = nf_conntrack_init_net(net);
 669         if (ret < 0)
 670                 goto out_init;
 671
 672         ret = nf_conntrack_standalone_init_proc(net);
 673         if (ret < 0)
 674                 goto out_proc;
 675
 676         net->ct.sysctl_checksum = 1;
 677         net->ct.sysctl_log_invalid = 0;
 678         ret = nf_conntrack_standalone_init_sysctl(net);
 679         if (ret < 0)
 680                 goto out_sysctl;
 681
 682         return 0;
 683
 684 out_sysctl:
 685         nf_conntrack_standalone_fini_proc(net);
 686 out_proc:
 687         nf_conntrack_cleanup_net(net);
 688 out_init:
 689         return ret;
 690 }
 691
 692 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 693 {
 694         struct net *net;
 695
 696         list_for_each_entry(net, net_exit_list, exit_list) {
 697                 nf_conntrack_standalone_fini_sysctl(net);
 698                 nf_conntrack_standalone_fini_proc(net);
 699         }
 700         nf_conntrack_cleanup_net_list(net_exit_list);
 701 }
 702
 703 static struct pernet_operations nf_conntrack_net_ops = {
 704         .init           = nf_conntrack_pernet_init,
 705         .exit_batch     = nf_conntrack_pernet_exit,
 706 };
 707
 708 static int __init nf_conntrack_standalone_init(void)
 709 {
 710         int ret = nf_conntrack_init_start();
 711         if (ret < 0)
 712                 goto out_start;
 713
 714         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 715         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 716
 717 #ifdef CONFIG_SYSCTL
 718         nf_ct_netfilter_header =
 719                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 720         if (!nf_ct_netfilter_header) {
 721                 pr_err("nf_conntrack: can't register to sysctl.\n");
 722                 ret = -ENOMEM;
 723                 goto out_sysctl;
 724         }
 725
 726         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 727 #endif
 728
 729         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 730         if (ret < 0)
 731                 goto out_pernet;
 732
 733         nf_conntrack_init_end();
 734         return 0;
 735
 736 out_pernet:
 737 #ifdef CONFIG_SYSCTL
 738         unregister_net_sysctl_table(nf_ct_netfilter_header);
 739 out_sysctl:
 740 #endif
 741         nf_conntrack_cleanup_end();
 742 out_start:
 743         return ret;
 744 }
 745
 746 static void __exit nf_conntrack_standalone_fini(void)
 747 {
 748         nf_conntrack_cleanup_start();
 749         unregister_pernet_subsys(&nf_conntrack_net_ops);
 750 #ifdef CONFIG_SYSCTL
 751         unregister_net_sysctl_table(nf_ct_netfilter_header);
 752 #endif
 753         nf_conntrack_cleanup_end();
 754 }
 755
 756 module_init(nf_conntrack_standalone_init);
 757 module_exit(nf_conntrack_standalone_fini);
 758
 759 /* Some modules need us, but don't depend directly on any symbol.
 760    They should call this. */
 761 void need_conntrack(void)
 762 {
 763 }
 764 EXPORT_SYMBOL_GPL(need_conntrack);