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         case IPPROTO_ICMPV6: return "icmpv6";
 276         }
 277
 278         return "unknown";
 279 }
 280
 281 /* return 0 on success, 1 in case of error */
 282 static int ct_seq_show(struct seq_file *s, void *v)
 283 {
 284         struct nf_conntrack_tuple_hash *hash = v;
 285         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 286         const struct nf_conntrack_l3proto *l3proto;
 287         const struct nf_conntrack_l4proto *l4proto;
 288         struct net *net = seq_file_net(s);
 289         int ret = 0;
 290
 291         WARN_ON(!ct);
 292         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 293                 return 0;
 294
 295         if (nf_ct_should_gc(ct)) {
 296                 nf_ct_kill(ct);
 297                 goto release;
 298         }
 299
 300         /* we only want to print DIR_ORIGINAL */
 301         if (NF_CT_DIRECTION(hash))
 302                 goto release;
 303
 304         if (!net_eq(nf_ct_net(ct), net))
 305                 goto release;
 306
 307         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 308         WARN_ON(!l3proto);
 309         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 310         WARN_ON(!l4proto);
 311
 312         ret = -ENOSPC;
 313         seq_printf(s, "%-8s %u %-8s %u %ld ",
 314                    l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
 315                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct),
 316                    nf_ct_expires(ct)  / HZ);
 317
 318         if (l4proto->print_conntrack)
 319                 l4proto->print_conntrack(s, ct);
 320
 321         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 322                     l3proto, l4proto);
 323
 324         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 325
 326         if (seq_has_overflowed(s))
 327                 goto release;
 328
 329         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 330                 goto release;
 331
 332         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 333                 seq_puts(s, "[UNREPLIED] ");
 334
 335         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 336                     l3proto, l4proto);
 337
 338         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 339
 340         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 341                 goto release;
 342
 343         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 344                 seq_puts(s, "[ASSURED] ");
 345
 346         if (seq_has_overflowed(s))
 347                 goto release;
 348
 349 #if defined(CONFIG_NF_CONNTRACK_MARK)
 350         seq_printf(s, "mark=%u ", ct->mark);
 351 #endif
 352
 353         ct_show_secctx(s, ct);
 354         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 355         ct_show_delta_time(s, ct);
 356
 357         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 358
 359         if (seq_has_overflowed(s))
 360                 goto release;
 361
 362         ret = 0;
 363 release:
 364         nf_ct_put(ct);
 365         return ret;
 366 }
 367
 368 static const struct seq_operations ct_seq_ops = {
 369         .start = ct_seq_start,
 370         .next  = ct_seq_next,
 371         .stop  = ct_seq_stop,
 372         .show  = ct_seq_show
 373 };
 374
 375 static int ct_open(struct inode *inode, struct file *file)
 376 {
 377         return seq_open_net(inode, file, &ct_seq_ops,
 378                         sizeof(struct ct_iter_state));
 379 }
 380
 381 static const struct file_operations ct_file_ops = {
 382         .owner   = THIS_MODULE,
 383         .open    = ct_open,
 384         .read    = seq_read,
 385         .llseek  = seq_lseek,
 386         .release = seq_release_net,
 387 };
 388
 389 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 390 {
 391         struct net *net = seq_file_net(seq);
 392         int cpu;
 393
 394         if (*pos == 0)
 395                 return SEQ_START_TOKEN;
 396
 397         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 398                 if (!cpu_possible(cpu))
 399                         continue;
 400                 *pos = cpu + 1;
 401                 return per_cpu_ptr(net->ct.stat, cpu);
 402         }
 403
 404         return NULL;
 405 }
 406
 407 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 408 {
 409         struct net *net = seq_file_net(seq);
 410         int cpu;
 411
 412         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 413                 if (!cpu_possible(cpu))
 414                         continue;
 415                 *pos = cpu + 1;
 416                 return per_cpu_ptr(net->ct.stat, cpu);
 417         }
 418
 419         return NULL;
 420 }
 421
 422 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 423 {
 424 }
 425
 426 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 427 {
 428         struct net *net = seq_file_net(seq);
 429         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 430         const struct ip_conntrack_stat *st = v;
 431
 432         if (v == SEQ_START_TOKEN) {
 433                 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");
 434                 return 0;
 435         }
 436
 437         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 438                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 439                    nr_conntracks,
 440                    0,
 441                    st->found,
 442                    0,
 443                    st->invalid,
 444                    st->ignore,
 445                    0,
 446                    0,
 447                    st->insert,
 448                    st->insert_failed,
 449                    st->drop,
 450                    st->early_drop,
 451                    st->error,
 452
 453                    st->expect_new,
 454                    st->expect_create,
 455                    st->expect_delete,
 456                    st->search_restart
 457                 );
 458         return 0;
 459 }
 460
 461 static const struct seq_operations ct_cpu_seq_ops = {
 462         .start  = ct_cpu_seq_start,
 463         .next   = ct_cpu_seq_next,
 464         .stop   = ct_cpu_seq_stop,
 465         .show   = ct_cpu_seq_show,
 466 };
 467
 468 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 469 {
 470         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 471                             sizeof(struct seq_net_private));
 472 }
 473
 474 static const struct file_operations ct_cpu_seq_fops = {
 475         .owner   = THIS_MODULE,
 476         .open    = ct_cpu_seq_open,
 477         .read    = seq_read,
 478         .llseek  = seq_lseek,
 479         .release = seq_release_net,
 480 };
 481
 482 static int nf_conntrack_standalone_init_proc(struct net *net)
 483 {
 484         struct proc_dir_entry *pde;
 485         kuid_t root_uid;
 486         kgid_t root_gid;
 487
 488         pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
 489         if (!pde)
 490                 goto out_nf_conntrack;
 491
 492         root_uid = make_kuid(net->user_ns, 0);
 493         root_gid = make_kgid(net->user_ns, 0);
 494         if (uid_valid(root_uid) && gid_valid(root_gid))
 495                 proc_set_user(pde, root_uid, root_gid);
 496
 497         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
 498                           &ct_cpu_seq_fops);
 499         if (!pde)
 500                 goto out_stat_nf_conntrack;
 501         return 0;
 502
 503 out_stat_nf_conntrack:
 504         remove_proc_entry("nf_conntrack", net->proc_net);
 505 out_nf_conntrack:
 506         return -ENOMEM;
 507 }
 508
 509 static void nf_conntrack_standalone_fini_proc(struct net *net)
 510 {
 511         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 512         remove_proc_entry("nf_conntrack", net->proc_net);
 513 }
 514 #else
 515 static int nf_conntrack_standalone_init_proc(struct net *net)
 516 {
 517         return 0;
 518 }
 519
 520 static void nf_conntrack_standalone_fini_proc(struct net *net)
 521 {
 522 }
 523 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 524
 525 /* Sysctl support */
 526
 527 #ifdef CONFIG_SYSCTL
 528 /* Log invalid packets of a given protocol */
 529 static int log_invalid_proto_min __read_mostly;
 530 static int log_invalid_proto_max __read_mostly = 255;
 531
 532 /* size the user *wants to set */
 533 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 534
 535 static int
 536 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 537                          void __user *buffer, size_t *lenp, loff_t *ppos)
 538 {
 539         int ret;
 540
 541         /* module_param hashsize could have changed value */
 542         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 543
 544         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 545         if (ret < 0 || !write)
 546                 return ret;
 547
 548         /* update ret, we might not be able to satisfy request */
 549         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 550
 551         /* update it to the actual value used by conntrack */
 552         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 553         return ret;
 554 }
 555
 556 static struct ctl_table_header *nf_ct_netfilter_header;
 557
 558 static struct ctl_table nf_ct_sysctl_table[] = {
 559         {
 560                 .procname       = "nf_conntrack_max",
 561                 .data           = &nf_conntrack_max,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566         {
 567                 .procname       = "nf_conntrack_count",
 568                 .data           = &init_net.ct.count,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0444,
 571                 .proc_handler   = proc_dointvec,
 572         },
 573         {
 574                 .procname       = "nf_conntrack_buckets",
 575                 .data           = &nf_conntrack_htable_size_user,
 576                 .maxlen         = sizeof(unsigned int),
 577                 .mode           = 0644,
 578                 .proc_handler   = nf_conntrack_hash_sysctl,
 579         },
 580         {
 581                 .procname       = "nf_conntrack_checksum",
 582                 .data           = &init_net.ct.sysctl_checksum,
 583                 .maxlen         = sizeof(unsigned int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec,
 586         },
 587         {
 588                 .procname       = "nf_conntrack_log_invalid",
 589                 .data           = &init_net.ct.sysctl_log_invalid,
 590                 .maxlen         = sizeof(unsigned int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec_minmax,
 593                 .extra1         = &log_invalid_proto_min,
 594                 .extra2         = &log_invalid_proto_max,
 595         },
 596         {
 597                 .procname       = "nf_conntrack_expect_max",
 598                 .data           = &nf_ct_expect_max,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = proc_dointvec,
 602         },
 603         { }
 604 };
 605
 606 static struct ctl_table nf_ct_netfilter_table[] = {
 607         {
 608                 .procname       = "nf_conntrack_max",
 609                 .data           = &nf_conntrack_max,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dointvec,
 613         },
 614         { }
 615 };
 616
 617 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 618 {
 619         struct ctl_table *table;
 620
 621         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 622                         GFP_KERNEL);
 623         if (!table)
 624                 goto out_kmemdup;
 625
 626         table[1].data = &net->ct.count;
 627         table[3].data = &net->ct.sysctl_checksum;
 628         table[4].data = &net->ct.sysctl_log_invalid;
 629
 630         /* Don't export sysctls to unprivileged users */
 631         if (net->user_ns != &init_user_ns)
 632                 table[0].procname = NULL;
 633
 634         if (!net_eq(&init_net, net)) {
 635                 table[0].mode = 0444;
 636                 table[2].mode = 0444;
 637                 table[5].mode = 0444;
 638         }
 639
 640         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 641         if (!net->ct.sysctl_header)
 642                 goto out_unregister_netfilter;
 643
 644         return 0;
 645
 646 out_unregister_netfilter:
 647         kfree(table);
 648 out_kmemdup:
 649         return -ENOMEM;
 650 }
 651
 652 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 653 {
 654         struct ctl_table *table;
 655
 656         table = net->ct.sysctl_header->ctl_table_arg;
 657         unregister_net_sysctl_table(net->ct.sysctl_header);
 658         kfree(table);
 659 }
 660 #else
 661 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 662 {
 663         return 0;
 664 }
 665
 666 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 667 {
 668 }
 669 #endif /* CONFIG_SYSCTL */
 670
 671 static int nf_conntrack_pernet_init(struct net *net)
 672 {
 673         int ret;
 674
 675         ret = nf_conntrack_init_net(net);
 676         if (ret < 0)
 677                 goto out_init;
 678
 679         ret = nf_conntrack_standalone_init_proc(net);
 680         if (ret < 0)
 681                 goto out_proc;
 682
 683         net->ct.sysctl_checksum = 1;
 684         net->ct.sysctl_log_invalid = 0;
 685         ret = nf_conntrack_standalone_init_sysctl(net);
 686         if (ret < 0)
 687                 goto out_sysctl;
 688
 689         return 0;
 690
 691 out_sysctl:
 692         nf_conntrack_standalone_fini_proc(net);
 693 out_proc:
 694         nf_conntrack_cleanup_net(net);
 695 out_init:
 696         return ret;
 697 }
 698
 699 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 700 {
 701         struct net *net;
 702
 703         list_for_each_entry(net, net_exit_list, exit_list) {
 704                 nf_conntrack_standalone_fini_sysctl(net);
 705                 nf_conntrack_standalone_fini_proc(net);
 706         }
 707         nf_conntrack_cleanup_net_list(net_exit_list);
 708 }
 709
 710 static struct pernet_operations nf_conntrack_net_ops = {
 711         .init           = nf_conntrack_pernet_init,
 712         .exit_batch     = nf_conntrack_pernet_exit,
 713 };
 714
 715 static int __init nf_conntrack_standalone_init(void)
 716 {
 717         int ret = nf_conntrack_init_start();
 718         if (ret < 0)
 719                 goto out_start;
 720
 721         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 722         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 723
 724 #ifdef CONFIG_SYSCTL
 725         nf_ct_netfilter_header =
 726                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 727         if (!nf_ct_netfilter_header) {
 728                 pr_err("nf_conntrack: can't register to sysctl.\n");
 729                 ret = -ENOMEM;
 730                 goto out_sysctl;
 731         }
 732
 733         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 734 #endif
 735
 736         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 737         if (ret < 0)
 738                 goto out_pernet;
 739
 740         nf_conntrack_init_end();
 741         return 0;
 742
 743 out_pernet:
 744 #ifdef CONFIG_SYSCTL
 745         unregister_net_sysctl_table(nf_ct_netfilter_header);
 746 out_sysctl:
 747 #endif
 748         nf_conntrack_cleanup_end();
 749 out_start:
 750         return ret;
 751 }
 752
 753 static void __exit nf_conntrack_standalone_fini(void)
 754 {
 755         nf_conntrack_cleanup_start();
 756         unregister_pernet_subsys(&nf_conntrack_net_ops);
 757 #ifdef CONFIG_SYSCTL
 758         unregister_net_sysctl_table(nf_ct_netfilter_header);
 759 #endif
 760         nf_conntrack_cleanup_end();
 761 }
 762
 763 module_init(nf_conntrack_standalone_init);
 764 module_exit(nf_conntrack_standalone_fini);
 765
 766 /* Some modules need us, but don't depend directly on any symbol.
 767    They should call this. */
 768 void need_conntrack(void)
 769 {
 770 }
 771 EXPORT_SYMBOL_GPL(need_conntrack);