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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/netfilter.h>
   4 #include <linux/slab.h>
   5 #include <linux/module.h>
   6 #include <linux/skbuff.h>
   7 #include <linux/proc_fs.h>
   8 #include <linux/seq_file.h>
   9 #include <linux/percpu.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/security.h>
  12 #include <net/net_namespace.h>
  13 #ifdef CONFIG_SYSCTL
  14 #include <linux/sysctl.h>
  15 #endif
  16
  17 #include <net/netfilter/nf_conntrack.h>
  18 #include <net/netfilter/nf_conntrack_core.h>
  19 #include <net/netfilter/nf_conntrack_l4proto.h>
  20 #include <net/netfilter/nf_conntrack_expect.h>
  21 #include <net/netfilter/nf_conntrack_helper.h>
  22 #include <net/netfilter/nf_conntrack_acct.h>
  23 #include <net/netfilter/nf_conntrack_zones.h>
  24 #include <net/netfilter/nf_conntrack_timestamp.h>
  25 #include <linux/rculist_nulls.h>
  26
  27 unsigned int nf_conntrack_net_id __read_mostly;
  28
  29 #ifdef CONFIG_NF_CONNTRACK_PROCFS
  30 void
  31 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  32             const struct nf_conntrack_l4proto *l4proto)
  33 {
  34         switch (tuple->src.l3num) {
  35         case NFPROTO_IPV4:
  36                 seq_printf(s, "src=%pI4 dst=%pI4 ",
  37                            &tuple->src.u3.ip, &tuple->dst.u3.ip);
  38                 break;
  39         case NFPROTO_IPV6:
  40                 seq_printf(s, "src=%pI6 dst=%pI6 ",
  41                            tuple->src.u3.ip6, tuple->dst.u3.ip6);
  42                 break;
  43         default:
  44                 break;
  45         }
  46
  47         switch (l4proto->l4proto) {
  48         case IPPROTO_ICMP:
  49                 seq_printf(s, "type=%u code=%u id=%u ",
  50                            tuple->dst.u.icmp.type,
  51                            tuple->dst.u.icmp.code,
  52                            ntohs(tuple->src.u.icmp.id));
  53                 break;
  54         case IPPROTO_TCP:
  55                 seq_printf(s, "sport=%hu dport=%hu ",
  56                            ntohs(tuple->src.u.tcp.port),
  57                            ntohs(tuple->dst.u.tcp.port));
  58                 break;
  59         case IPPROTO_UDPLITE: /* fallthrough */
  60         case IPPROTO_UDP:
  61                 seq_printf(s, "sport=%hu dport=%hu ",
  62                            ntohs(tuple->src.u.udp.port),
  63                            ntohs(tuple->dst.u.udp.port));
  64
  65                 break;
  66         case IPPROTO_DCCP:
  67                 seq_printf(s, "sport=%hu dport=%hu ",
  68                            ntohs(tuple->src.u.dccp.port),
  69                            ntohs(tuple->dst.u.dccp.port));
  70                 break;
  71         case IPPROTO_SCTP:
  72                 seq_printf(s, "sport=%hu dport=%hu ",
  73                            ntohs(tuple->src.u.sctp.port),
  74                            ntohs(tuple->dst.u.sctp.port));
  75                 break;
  76         case IPPROTO_ICMPV6:
  77                 seq_printf(s, "type=%u code=%u id=%u ",
  78                            tuple->dst.u.icmp.type,
  79                            tuple->dst.u.icmp.code,
  80                            ntohs(tuple->src.u.icmp.id));
  81                 break;
  82         case IPPROTO_GRE:
  83                 seq_printf(s, "srckey=0x%x dstkey=0x%x ",
  84                            ntohs(tuple->src.u.gre.key),
  85                            ntohs(tuple->dst.u.gre.key));
  86                 break;
  87         default:
  88                 break;
  89         }
  90 }
  91 EXPORT_SYMBOL_GPL(print_tuple);
  92
  93 struct ct_iter_state {
  94         struct seq_net_private p;
  95         struct hlist_nulls_head *hash;
  96         unsigned int htable_size;
  97         unsigned int bucket;
  98         u_int64_t time_now;
  99 };
 100
 101 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 102 {
 103         struct ct_iter_state *st = seq->private;
 104         struct hlist_nulls_node *n;
 105
 106         for (st->bucket = 0;
 107              st->bucket < st->htable_size;
 108              st->bucket++) {
 109                 n = rcu_dereference(
 110                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 111                 if (!is_a_nulls(n))
 112                         return n;
 113         }
 114         return NULL;
 115 }
 116
 117 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 118                                       struct hlist_nulls_node *head)
 119 {
 120         struct ct_iter_state *st = seq->private;
 121
 122         head = rcu_dereference(hlist_nulls_next_rcu(head));
 123         while (is_a_nulls(head)) {
 124                 if (likely(get_nulls_value(head) == st->bucket)) {
 125                         if (++st->bucket >= st->htable_size)
 126                                 return NULL;
 127                 }
 128                 head = rcu_dereference(
 129                         hlist_nulls_first_rcu(&st->hash[st->bucket]));
 130         }
 131         return head;
 132 }
 133
 134 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 135 {
 136         struct hlist_nulls_node *head = ct_get_first(seq);
 137
 138         if (head)
 139                 while (pos && (head = ct_get_next(seq, head)))
 140                         pos--;
 141         return pos ? NULL : head;
 142 }
 143
 144 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 145         __acquires(RCU)
 146 {
 147         struct ct_iter_state *st = seq->private;
 148
 149         st->time_now = ktime_get_real_ns();
 150         rcu_read_lock();
 151
 152         nf_conntrack_get_ht(&st->hash, &st->htable_size);
 153         return ct_get_idx(seq, *pos);
 154 }
 155
 156 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 157 {
 158         (*pos)++;
 159         return ct_get_next(s, v);
 160 }
 161
 162 static void ct_seq_stop(struct seq_file *s, void *v)
 163         __releases(RCU)
 164 {
 165         rcu_read_unlock();
 166 }
 167
 168 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 169 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 170 {
 171         int ret;
 172         u32 len;
 173         char *secctx;
 174
 175         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 176         if (ret)
 177                 return;
 178
 179         seq_printf(s, "secctx=%s ", secctx);
 180
 181         security_release_secctx(secctx, len);
 182 }
 183 #else
 184 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 185 {
 186 }
 187 #endif
 188
 189 #ifdef CONFIG_NF_CONNTRACK_ZONES
 190 static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 191                          int dir)
 192 {
 193         const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
 194
 195         if (zone->dir != dir)
 196                 return;
 197         switch (zone->dir) {
 198         case NF_CT_DEFAULT_ZONE_DIR:
 199                 seq_printf(s, "zone=%u ", zone->id);
 200                 break;
 201         case NF_CT_ZONE_DIR_ORIG:
 202                 seq_printf(s, "zone-orig=%u ", zone->id);
 203                 break;
 204         case NF_CT_ZONE_DIR_REPL:
 205                 seq_printf(s, "zone-reply=%u ", zone->id);
 206                 break;
 207         default:
 208                 break;
 209         }
 210 }
 211 #else
 212 static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
 213                                 int dir)
 214 {
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 219 static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 220 {
 221         struct ct_iter_state *st = s->private;
 222         struct nf_conn_tstamp *tstamp;
 223         s64 delta_time;
 224
 225         tstamp = nf_conn_tstamp_find(ct);
 226         if (tstamp) {
 227                 delta_time = st->time_now - tstamp->start;
 228                 if (delta_time > 0)
 229                         delta_time = div_s64(delta_time, NSEC_PER_SEC);
 230                 else
 231                         delta_time = 0;
 232
 233                 seq_printf(s, "delta-time=%llu ",
 234                            (unsigned long long)delta_time);
 235         }
 236         return;
 237 }
 238 #else
 239 static inline void
 240 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
 241 {
 242 }
 243 #endif
 244
 245 static const char* l3proto_name(u16 proto)
 246 {
 247         switch (proto) {
 248         case AF_INET: return "ipv4";
 249         case AF_INET6: return "ipv6";
 250         }
 251
 252         return "unknown";
 253 }
 254
 255 static const char* l4proto_name(u16 proto)
 256 {
 257         switch (proto) {
 258         case IPPROTO_ICMP: return "icmp";
 259         case IPPROTO_TCP: return "tcp";
 260         case IPPROTO_UDP: return "udp";
 261         case IPPROTO_DCCP: return "dccp";
 262         case IPPROTO_GRE: return "gre";
 263         case IPPROTO_SCTP: return "sctp";
 264         case IPPROTO_UDPLITE: return "udplite";
 265         }
 266
 267         return "unknown";
 268 }
 269
 270 static unsigned int
 271 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
 272 {
 273         struct nf_conn_acct *acct;
 274         struct nf_conn_counter *counter;
 275
 276         acct = nf_conn_acct_find(ct);
 277         if (!acct)
 278                 return 0;
 279
 280         counter = acct->counter;
 281         seq_printf(s, "packets=%llu bytes=%llu ",
 282                    (unsigned long long)atomic64_read(&counter[dir].packets),
 283                    (unsigned long long)atomic64_read(&counter[dir].bytes));
 284
 285         return 0;
 286 }
 287
 288 /* return 0 on success, 1 in case of error */
 289 static int ct_seq_show(struct seq_file *s, void *v)
 290 {
 291         struct nf_conntrack_tuple_hash *hash = v;
 292         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 293         const struct nf_conntrack_l4proto *l4proto;
 294         struct net *net = seq_file_net(s);
 295         int ret = 0;
 296
 297         WARN_ON(!ct);
 298         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 299                 return 0;
 300
 301         if (nf_ct_should_gc(ct)) {
 302                 nf_ct_kill(ct);
 303                 goto release;
 304         }
 305
 306         /* we only want to print DIR_ORIGINAL */
 307         if (NF_CT_DIRECTION(hash))
 308                 goto release;
 309
 310         if (!net_eq(nf_ct_net(ct), net))
 311                 goto release;
 312
 313         l4proto = __nf_ct_l4proto_find(nf_ct_protonum(ct));
 314         WARN_ON(!l4proto);
 315
 316         ret = -ENOSPC;
 317         seq_printf(s, "%-8s %u %-8s %u ",
 318                    l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
 319                    l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
 320
 321         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
 322                 seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);
 323
 324         if (l4proto->print_conntrack)
 325                 l4proto->print_conntrack(s, ct);
 326
 327         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 328                     l4proto);
 329
 330         ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
 331
 332         if (seq_has_overflowed(s))
 333                 goto release;
 334
 335         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 336                 goto release;
 337
 338         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 339                 seq_puts(s, "[UNREPLIED] ");
 340
 341         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, l4proto);
 342
 343         ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
 344
 345         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 346                 goto release;
 347
 348         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
 349                 seq_puts(s, "[OFFLOAD] ");
 350         else if (test_bit(IPS_ASSURED_BIT, &ct->status))
 351                 seq_puts(s, "[ASSURED] ");
 352
 353         if (seq_has_overflowed(s))
 354                 goto release;
 355
 356 #if defined(CONFIG_NF_CONNTRACK_MARK)
 357         seq_printf(s, "mark=%u ", ct->mark);
 358 #endif
 359
 360         ct_show_secctx(s, ct);
 361         ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
 362         ct_show_delta_time(s, ct);
 363
 364         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 365
 366         if (seq_has_overflowed(s))
 367                 goto release;
 368
 369         ret = 0;
 370 release:
 371         nf_ct_put(ct);
 372         return ret;
 373 }
 374
 375 static const struct seq_operations ct_seq_ops = {
 376         .start = ct_seq_start,
 377         .next  = ct_seq_next,
 378         .stop  = ct_seq_stop,
 379         .show  = ct_seq_show
 380 };
 381
 382 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 383 {
 384         struct net *net = seq_file_net(seq);
 385         int cpu;
 386
 387         if (*pos == 0)
 388                 return SEQ_START_TOKEN;
 389
 390         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 391                 if (!cpu_possible(cpu))
 392                         continue;
 393                 *pos = cpu + 1;
 394                 return per_cpu_ptr(net->ct.stat, cpu);
 395         }
 396
 397         return NULL;
 398 }
 399
 400 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 401 {
 402         struct net *net = seq_file_net(seq);
 403         int cpu;
 404
 405         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 406                 if (!cpu_possible(cpu))
 407                         continue;
 408                 *pos = cpu + 1;
 409                 return per_cpu_ptr(net->ct.stat, cpu);
 410         }
 411
 412         return NULL;
 413 }
 414
 415 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 416 {
 417 }
 418
 419 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 420 {
 421         struct net *net = seq_file_net(seq);
 422         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 423         const struct ip_conntrack_stat *st = v;
 424
 425         if (v == SEQ_START_TOKEN) {
 426                 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");
 427                 return 0;
 428         }
 429
 430         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 431                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 432                    nr_conntracks,
 433                    0,
 434                    st->found,
 435                    0,
 436                    st->invalid,
 437                    st->ignore,
 438                    0,
 439                    0,
 440                    st->insert,
 441                    st->insert_failed,
 442                    st->drop,
 443                    st->early_drop,
 444                    st->error,
 445
 446                    st->expect_new,
 447                    st->expect_create,
 448                    st->expect_delete,
 449                    st->search_restart
 450                 );
 451         return 0;
 452 }
 453
 454 static const struct seq_operations ct_cpu_seq_ops = {
 455         .start  = ct_cpu_seq_start,
 456         .next   = ct_cpu_seq_next,
 457         .stop   = ct_cpu_seq_stop,
 458         .show   = ct_cpu_seq_show,
 459 };
 460
 461 static int nf_conntrack_standalone_init_proc(struct net *net)
 462 {
 463         struct proc_dir_entry *pde;
 464         kuid_t root_uid;
 465         kgid_t root_gid;
 466
 467         pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
 468                         sizeof(struct ct_iter_state));
 469         if (!pde)
 470                 goto out_nf_conntrack;
 471
 472         root_uid = make_kuid(net->user_ns, 0);
 473         root_gid = make_kgid(net->user_ns, 0);
 474         if (uid_valid(root_uid) && gid_valid(root_gid))
 475                 proc_set_user(pde, root_uid, root_gid);
 476
 477         pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
 478                         &ct_cpu_seq_ops, sizeof(struct seq_net_private));
 479         if (!pde)
 480                 goto out_stat_nf_conntrack;
 481         return 0;
 482
 483 out_stat_nf_conntrack:
 484         remove_proc_entry("nf_conntrack", net->proc_net);
 485 out_nf_conntrack:
 486         return -ENOMEM;
 487 }
 488
 489 static void nf_conntrack_standalone_fini_proc(struct net *net)
 490 {
 491         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 492         remove_proc_entry("nf_conntrack", net->proc_net);
 493 }
 494 #else
 495 static int nf_conntrack_standalone_init_proc(struct net *net)
 496 {
 497         return 0;
 498 }
 499
 500 static void nf_conntrack_standalone_fini_proc(struct net *net)
 501 {
 502 }
 503 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
 504
 505 /* Sysctl support */
 506
 507 #ifdef CONFIG_SYSCTL
 508 /* Log invalid packets of a given protocol */
 509 static int log_invalid_proto_min __read_mostly;
 510 static int log_invalid_proto_max __read_mostly = 255;
 511
 512 /* size the user *wants to set */
 513 static unsigned int nf_conntrack_htable_size_user __read_mostly;
 514
 515 static int
 516 nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
 517                          void __user *buffer, size_t *lenp, loff_t *ppos)
 518 {
 519         int ret;
 520
 521         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 522         if (ret < 0 || !write)
 523                 return ret;
 524
 525         /* update ret, we might not be able to satisfy request */
 526         ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
 527
 528         /* update it to the actual value used by conntrack */
 529         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 530         return ret;
 531 }
 532
 533 static struct ctl_table_header *nf_ct_netfilter_header;
 534
 535 enum nf_ct_sysctl_index {
 536         NF_SYSCTL_CT_MAX,
 537         NF_SYSCTL_CT_COUNT,
 538         NF_SYSCTL_CT_BUCKETS,
 539         NF_SYSCTL_CT_CHECKSUM,
 540         NF_SYSCTL_CT_LOG_INVALID,
 541         NF_SYSCTL_CT_EXPECT_MAX,
 542         NF_SYSCTL_CT_ACCT,
 543         NF_SYSCTL_CT_HELPER,
 544 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 545         NF_SYSCTL_CT_EVENTS,
 546 #endif
 547 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 548         NF_SYSCTL_CT_TIMESTAMP,
 549 #endif
 550 };
 551
 552 static struct ctl_table nf_ct_sysctl_table[] = {
 553         [NF_SYSCTL_CT_MAX] = {
 554                 .procname       = "nf_conntrack_max",
 555                 .data           = &nf_conntrack_max,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec,
 559         },
 560         [NF_SYSCTL_CT_COUNT] = {
 561                 .procname       = "nf_conntrack_count",
 562                 .data           = &init_net.ct.count,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0444,
 565                 .proc_handler   = proc_dointvec,
 566         },
 567         [NF_SYSCTL_CT_BUCKETS] = {
 568                 .procname       = "nf_conntrack_buckets",
 569                 .data           = &nf_conntrack_htable_size_user,
 570                 .maxlen         = sizeof(unsigned int),
 571                 .mode           = 0644,
 572                 .proc_handler   = nf_conntrack_hash_sysctl,
 573         },
 574         [NF_SYSCTL_CT_CHECKSUM] = {
 575                 .procname       = "nf_conntrack_checksum",
 576                 .data           = &init_net.ct.sysctl_checksum,
 577                 .maxlen         = sizeof(unsigned int),
 578                 .mode           = 0644,
 579                 .proc_handler   = proc_dointvec,
 580         },
 581         [NF_SYSCTL_CT_LOG_INVALID] = {
 582                 .procname       = "nf_conntrack_log_invalid",
 583                 .data           = &init_net.ct.sysctl_log_invalid,
 584                 .maxlen         = sizeof(unsigned int),
 585                 .mode           = 0644,
 586                 .proc_handler   = proc_dointvec_minmax,
 587                 .extra1         = &log_invalid_proto_min,
 588                 .extra2         = &log_invalid_proto_max,
 589         },
 590         [NF_SYSCTL_CT_EXPECT_MAX] = {
 591                 .procname       = "nf_conntrack_expect_max",
 592                 .data           = &nf_ct_expect_max,
 593                 .maxlen         = sizeof(int),
 594                 .mode           = 0644,
 595                 .proc_handler   = proc_dointvec,
 596         },
 597         [NF_SYSCTL_CT_ACCT] = {
 598                 .procname       = "nf_conntrack_acct",
 599                 .data           = &init_net.ct.sysctl_acct,
 600                 .maxlen         = sizeof(unsigned int),
 601                 .mode           = 0644,
 602                 .proc_handler   = proc_dointvec,
 603         },
 604         [NF_SYSCTL_CT_HELPER] = {
 605                 .procname       = "nf_conntrack_helper",
 606                 .data           = &init_net.ct.sysctl_auto_assign_helper,
 607                 .maxlen         = sizeof(unsigned int),
 608                 .mode           = 0644,
 609                 .proc_handler   = proc_dointvec,
 610         },
 611 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 612         [NF_SYSCTL_CT_EVENTS] = {
 613                 .procname       = "nf_conntrack_events",
 614                 .data           = &init_net.ct.sysctl_events,
 615                 .maxlen         = sizeof(unsigned int),
 616                 .mode           = 0644,
 617                 .proc_handler   = proc_dointvec,
 618         },
 619 #endif
 620 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 621         [NF_SYSCTL_CT_TIMESTAMP] = {
 622                 .procname       = "nf_conntrack_timestamp",
 623                 .data           = &init_net.ct.sysctl_tstamp,
 624                 .maxlen         = sizeof(unsigned int),
 625                 .mode           = 0644,
 626                 .proc_handler   = proc_dointvec,
 627         },
 628 #endif
 629         { }
 630 };
 631
 632 static struct ctl_table nf_ct_netfilter_table[] = {
 633         {
 634                 .procname       = "nf_conntrack_max",
 635                 .data           = &nf_conntrack_max,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec,
 639         },
 640         { }
 641 };
 642
 643 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 644 {
 645         struct ctl_table *table;
 646
 647         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 648                         GFP_KERNEL);
 649         if (!table)
 650                 goto out_kmemdup;
 651
 652         table[NF_SYSCTL_CT_COUNT].data = &net->ct.count;
 653         table[NF_SYSCTL_CT_CHECKSUM].data = &net->ct.sysctl_checksum;
 654         table[NF_SYSCTL_CT_LOG_INVALID].data = &net->ct.sysctl_log_invalid;
 655 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 656         table[NF_SYSCTL_CT_EVENTS].data = &net->ct.sysctl_events;
 657 #endif
 658
 659         /* Don't export sysctls to unprivileged users */
 660         if (net->user_ns != &init_user_ns) {
 661                 table[NF_SYSCTL_CT_MAX].procname = NULL;
 662                 table[NF_SYSCTL_CT_ACCT].procname = NULL;
 663                 table[NF_SYSCTL_CT_HELPER].procname = NULL;
 664 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 665                 table[NF_SYSCTL_CT_TIMESTAMP].procname = NULL;
 666 #endif
 667 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 668                 table[NF_SYSCTL_CT_EVENTS].procname = NULL;
 669 #endif
 670         }
 671
 672         if (!net_eq(&init_net, net))
 673                 table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
 674
 675         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
 676         if (!net->ct.sysctl_header)
 677                 goto out_unregister_netfilter;
 678
 679         return 0;
 680
 681 out_unregister_netfilter:
 682         kfree(table);
 683 out_kmemdup:
 684         return -ENOMEM;
 685 }
 686
 687 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 688 {
 689         struct ctl_table *table;
 690
 691         table = net->ct.sysctl_header->ctl_table_arg;
 692         unregister_net_sysctl_table(net->ct.sysctl_header);
 693         kfree(table);
 694 }
 695 #else
 696 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 697 {
 698         return 0;
 699 }
 700
 701 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 702 {
 703 }
 704 #endif /* CONFIG_SYSCTL */
 705
 706 static int nf_conntrack_pernet_init(struct net *net)
 707 {
 708         int ret;
 709
 710         ret = nf_conntrack_init_net(net);
 711         if (ret < 0)
 712                 goto out_init;
 713
 714         ret = nf_conntrack_standalone_init_proc(net);
 715         if (ret < 0)
 716                 goto out_proc;
 717
 718         net->ct.sysctl_checksum = 1;
 719         net->ct.sysctl_log_invalid = 0;
 720         ret = nf_conntrack_standalone_init_sysctl(net);
 721         if (ret < 0)
 722                 goto out_sysctl;
 723
 724         return 0;
 725
 726 out_sysctl:
 727         nf_conntrack_standalone_fini_proc(net);
 728 out_proc:
 729         nf_conntrack_cleanup_net(net);
 730 out_init:
 731         return ret;
 732 }
 733
 734 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
 735 {
 736         struct net *net;
 737
 738         list_for_each_entry(net, net_exit_list, exit_list) {
 739                 nf_conntrack_standalone_fini_sysctl(net);
 740                 nf_conntrack_standalone_fini_proc(net);
 741         }
 742         nf_conntrack_cleanup_net_list(net_exit_list);
 743 }
 744
 745 static struct pernet_operations nf_conntrack_net_ops = {
 746         .init           = nf_conntrack_pernet_init,
 747         .exit_batch     = nf_conntrack_pernet_exit,
 748         .id             = &nf_conntrack_net_id,
 749         .size = sizeof(struct nf_conntrack_net),
 750 };
 751
 752 static int __init nf_conntrack_standalone_init(void)
 753 {
 754         int ret = nf_conntrack_init_start();
 755         if (ret < 0)
 756                 goto out_start;
 757
 758         BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
 759         BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
 760
 761 #ifdef CONFIG_SYSCTL
 762         nf_ct_netfilter_header =
 763                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
 764         if (!nf_ct_netfilter_header) {
 765                 pr_err("nf_conntrack: can't register to sysctl.\n");
 766                 ret = -ENOMEM;
 767                 goto out_sysctl;
 768         }
 769
 770         nf_conntrack_htable_size_user = nf_conntrack_htable_size;
 771 #endif
 772
 773         ret = register_pernet_subsys(&nf_conntrack_net_ops);
 774         if (ret < 0)
 775                 goto out_pernet;
 776
 777         nf_conntrack_init_end();
 778         return 0;
 779
 780 out_pernet:
 781 #ifdef CONFIG_SYSCTL
 782         unregister_net_sysctl_table(nf_ct_netfilter_header);
 783 out_sysctl:
 784 #endif
 785         nf_conntrack_cleanup_end();
 786 out_start:
 787         return ret;
 788 }
 789
 790 static void __exit nf_conntrack_standalone_fini(void)
 791 {
 792         nf_conntrack_cleanup_start();
 793         unregister_pernet_subsys(&nf_conntrack_net_ops);
 794 #ifdef CONFIG_SYSCTL
 795         unregister_net_sysctl_table(nf_ct_netfilter_header);
 796 #endif
 797         nf_conntrack_cleanup_end();
 798 }
 799
 800 module_init(nf_conntrack_standalone_init);
 801 module_exit(nf_conntrack_standalone_fini);