net/netfilter/nf_conntrack_standalone.c

   1 /* (C) 1999-2001 Paul `Rusty' Russell
   2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/netfilter.h>
  11 #include <linux/module.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/percpu.h>
  16 #include <linux/netdevice.h>
  17 #include <net/net_namespace.h>
  18 #ifdef CONFIG_SYSCTL
  19 #include <linux/sysctl.h>
  20 #endif
  21
  22 #include <net/netfilter/nf_conntrack.h>
  23 #include <net/netfilter/nf_conntrack_core.h>
  24 #include <net/netfilter/nf_conntrack_l3proto.h>
  25 #include <net/netfilter/nf_conntrack_l4proto.h>
  26 #include <net/netfilter/nf_conntrack_expect.h>
  27 #include <net/netfilter/nf_conntrack_helper.h>
  28 #include <net/netfilter/nf_conntrack_acct.h>
  29 #include <net/netfilter/nf_conntrack_zones.h>
  30
  31 MODULE_LICENSE("GPL");
  32
  33 #ifdef CONFIG_PROC_FS
  34 int
  35 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  36             const struct nf_conntrack_l3proto *l3proto,
  37             const struct nf_conntrack_l4proto *l4proto)
  38 {
  39         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
  40 }
  41 EXPORT_SYMBOL_GPL(print_tuple);
  42
  43 struct ct_iter_state {
  44         struct seq_net_private p;
  45         unsigned int bucket;
  46 };
  47
  48 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
  49 {
  50         struct net *net = seq_file_net(seq);
  51         struct ct_iter_state *st = seq->private;
  52         struct hlist_nulls_node *n;
  53
  54         for (st->bucket = 0;
  55              st->bucket < net->ct.htable_size;
  56              st->bucket++) {
  57                 n = rcu_dereference(net->ct.hash[st->bucket].first);
  58                 if (!is_a_nulls(n))
  59                         return n;
  60         }
  61         return NULL;
  62 }
  63
  64 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
  65                                       struct hlist_nulls_node *head)
  66 {
  67         struct net *net = seq_file_net(seq);
  68         struct ct_iter_state *st = seq->private;
  69
  70         head = rcu_dereference(head->next);
  71         while (is_a_nulls(head)) {
  72                 if (likely(get_nulls_value(head) == st->bucket)) {
  73                         if (++st->bucket >= net->ct.htable_size)
  74                                 return NULL;
  75                 }
  76                 head = rcu_dereference(net->ct.hash[st->bucket].first);
  77         }
  78         return head;
  79 }
  80
  81 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  82 {
  83         struct hlist_nulls_node *head = ct_get_first(seq);
  84
  85         if (head)
  86                 while (pos && (head = ct_get_next(seq, head)))
  87                         pos--;
  88         return pos ? NULL : head;
  89 }
  90
  91 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  92         __acquires(RCU)
  93 {
  94         rcu_read_lock();
  95         return ct_get_idx(seq, *pos);
  96 }
  97
  98 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  99 {
 100         (*pos)++;
 101         return ct_get_next(s, v);
 102 }
 103
 104 static void ct_seq_stop(struct seq_file *s, void *v)
 105         __releases(RCU)
 106 {
 107         rcu_read_unlock();
 108 }
 109
 110 /* return 0 on success, 1 in case of error */
 111 static int ct_seq_show(struct seq_file *s, void *v)
 112 {
 113         struct nf_conntrack_tuple_hash *hash = v;
 114         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 115         const struct nf_conntrack_l3proto *l3proto;
 116         const struct nf_conntrack_l4proto *l4proto;
 117         int ret = 0;
 118
 119         NF_CT_ASSERT(ct);
 120         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 121                 return 0;
 122
 123         /* we only want to print DIR_ORIGINAL */
 124         if (NF_CT_DIRECTION(hash))
 125                 goto release;
 126
 127         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 128         NF_CT_ASSERT(l3proto);
 129         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 130         NF_CT_ASSERT(l4proto);
 131
 132         ret = -ENOSPC;
 133         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 134                        l3proto->name, nf_ct_l3num(ct),
 135                        l4proto->name, nf_ct_protonum(ct),
 136                        timer_pending(&ct->timeout)
 137                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 138                 goto release;
 139
 140         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 141                 goto release;
 142
 143         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 144                         l3proto, l4proto))
 145                 goto release;
 146
 147         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 148                 goto release;
 149
 150         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 151                 if (seq_printf(s, "[UNREPLIED] "))
 152                         goto release;
 153
 154         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 155                         l3proto, l4proto))
 156                 goto release;
 157
 158         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 159                 goto release;
 160
 161         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 162                 if (seq_printf(s, "[ASSURED] "))
 163                         goto release;
 164
 165 #if defined(CONFIG_NF_CONNTRACK_MARK)
 166         if (seq_printf(s, "mark=%u ", ct->mark))
 167                 goto release;
 168 #endif
 169
 170 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 171         if (seq_printf(s, "secmark=%u ", ct->secmark))
 172                 goto release;
 173 #endif
 174
 175 #ifdef CONFIG_NF_CONNTRACK_ZONES
 176         if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
 177                 goto release;
 178 #endif
 179
 180         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 181                 goto release;
 182
 183         ret = 0;
 184 release:
 185         nf_ct_put(ct);
 186         return 0;
 187 }
 188
 189 static const struct seq_operations ct_seq_ops = {
 190         .start = ct_seq_start,
 191         .next  = ct_seq_next,
 192         .stop  = ct_seq_stop,
 193         .show  = ct_seq_show
 194 };
 195
 196 static int ct_open(struct inode *inode, struct file *file)
 197 {
 198         return seq_open_net(inode, file, &ct_seq_ops,
 199                         sizeof(struct ct_iter_state));
 200 }
 201
 202 static const struct file_operations ct_file_ops = {
 203         .owner   = THIS_MODULE,
 204         .open    = ct_open,
 205         .read    = seq_read,
 206         .llseek  = seq_lseek,
 207         .release = seq_release_net,
 208 };
 209
 210 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 211 {
 212         struct net *net = seq_file_net(seq);
 213         int cpu;
 214
 215         if (*pos == 0)
 216                 return SEQ_START_TOKEN;
 217
 218         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 219                 if (!cpu_possible(cpu))
 220                         continue;
 221                 *pos = cpu + 1;
 222                 return per_cpu_ptr(net->ct.stat, cpu);
 223         }
 224
 225         return NULL;
 226 }
 227
 228 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 229 {
 230         struct net *net = seq_file_net(seq);
 231         int cpu;
 232
 233         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 234                 if (!cpu_possible(cpu))
 235                         continue;
 236                 *pos = cpu + 1;
 237                 return per_cpu_ptr(net->ct.stat, cpu);
 238         }
 239
 240         return NULL;
 241 }
 242
 243 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 244 {
 245 }
 246
 247 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 248 {
 249         struct net *net = seq_file_net(seq);
 250         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 251         const struct ip_conntrack_stat *st = v;
 252
 253         if (v == SEQ_START_TOKEN) {
 254                 seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete\n");
 255                 return 0;
 256         }
 257
 258         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 259                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 260                    nr_conntracks,
 261                    st->searched,
 262                    st->found,
 263                    st->new,
 264                    st->invalid,
 265                    st->ignore,
 266                    st->delete,
 267                    st->delete_list,
 268                    st->insert,
 269                    st->insert_failed,
 270                    st->drop,
 271                    st->early_drop,
 272                    st->error,
 273
 274                    st->expect_new,
 275                    st->expect_create,
 276                    st->expect_delete
 277                 );
 278         return 0;
 279 }
 280
 281 static const struct seq_operations ct_cpu_seq_ops = {
 282         .start  = ct_cpu_seq_start,
 283         .next   = ct_cpu_seq_next,
 284         .stop   = ct_cpu_seq_stop,
 285         .show   = ct_cpu_seq_show,
 286 };
 287
 288 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 289 {
 290         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 291                             sizeof(struct seq_net_private));
 292 }
 293
 294 static const struct file_operations ct_cpu_seq_fops = {
 295         .owner   = THIS_MODULE,
 296         .open    = ct_cpu_seq_open,
 297         .read    = seq_read,
 298         .llseek  = seq_lseek,
 299         .release = seq_release_net,
 300 };
 301
 302 static int nf_conntrack_standalone_init_proc(struct net *net)
 303 {
 304         struct proc_dir_entry *pde;
 305
 306         pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
 307         if (!pde)
 308                 goto out_nf_conntrack;
 309
 310         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
 311                           &ct_cpu_seq_fops);
 312         if (!pde)
 313                 goto out_stat_nf_conntrack;
 314         return 0;
 315
 316 out_stat_nf_conntrack:
 317         proc_net_remove(net, "nf_conntrack");
 318 out_nf_conntrack:
 319         return -ENOMEM;
 320 }
 321
 322 static void nf_conntrack_standalone_fini_proc(struct net *net)
 323 {
 324         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 325         proc_net_remove(net, "nf_conntrack");
 326 }
 327 #else
 328 static int nf_conntrack_standalone_init_proc(struct net *net)
 329 {
 330         return 0;
 331 }
 332
 333 static void nf_conntrack_standalone_fini_proc(struct net *net)
 334 {
 335 }
 336 #endif /* CONFIG_PROC_FS */
 337
 338 /* Sysctl support */
 339
 340 #ifdef CONFIG_SYSCTL
 341 /* Log invalid packets of a given protocol */
 342 static int log_invalid_proto_min = 0;
 343 static int log_invalid_proto_max = 255;
 344
 345 static struct ctl_table_header *nf_ct_netfilter_header;
 346
 347 static ctl_table nf_ct_sysctl_table[] = {
 348         {
 349                 .procname       = "nf_conntrack_max",
 350                 .data           = &nf_conntrack_max,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = proc_dointvec,
 354         },
 355         {
 356                 .procname       = "nf_conntrack_count",
 357                 .data           = &init_net.ct.count,
 358                 .maxlen         = sizeof(int),
 359                 .mode           = 0444,
 360                 .proc_handler   = proc_dointvec,
 361         },
 362         {
 363                 .procname       = "nf_conntrack_buckets",
 364                 .data           = &init_net.ct.htable_size,
 365                 .maxlen         = sizeof(unsigned int),
 366                 .mode           = 0444,
 367                 .proc_handler   = proc_dointvec,
 368         },
 369         {
 370                 .procname       = "nf_conntrack_checksum",
 371                 .data           = &init_net.ct.sysctl_checksum,
 372                 .maxlen         = sizeof(unsigned int),
 373                 .mode           = 0644,
 374                 .proc_handler   = proc_dointvec,
 375         },
 376         {
 377                 .procname       = "nf_conntrack_log_invalid",
 378                 .data           = &init_net.ct.sysctl_log_invalid,
 379                 .maxlen         = sizeof(unsigned int),
 380                 .mode           = 0644,
 381                 .proc_handler   = proc_dointvec_minmax,
 382                 .extra1         = &log_invalid_proto_min,
 383                 .extra2         = &log_invalid_proto_max,
 384         },
 385         {
 386                 .procname       = "nf_conntrack_expect_max",
 387                 .data           = &nf_ct_expect_max,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = proc_dointvec,
 391         },
 392         { }
 393 };
 394
 395 #define NET_NF_CONNTRACK_MAX 2089
 396
 397 static ctl_table nf_ct_netfilter_table[] = {
 398         {
 399                 .procname       = "nf_conntrack_max",
 400                 .data           = &nf_conntrack_max,
 401                 .maxlen         = sizeof(int),
 402                 .mode           = 0644,
 403                 .proc_handler   = proc_dointvec,
 404         },
 405         { }
 406 };
 407
 408 static struct ctl_path nf_ct_path[] = {
 409         { .procname = "net", },
 410         { }
 411 };
 412
 413 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 414 {
 415         struct ctl_table *table;
 416
 417         if (net_eq(net, &init_net)) {
 418                 nf_ct_netfilter_header =
 419                        register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
 420                 if (!nf_ct_netfilter_header)
 421                         goto out;
 422         }
 423
 424         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 425                         GFP_KERNEL);
 426         if (!table)
 427                 goto out_kmemdup;
 428
 429         table[1].data = &net->ct.count;
 430         table[2].data = &net->ct.htable_size;
 431         table[3].data = &net->ct.sysctl_checksum;
 432         table[4].data = &net->ct.sysctl_log_invalid;
 433
 434         net->ct.sysctl_header = register_net_sysctl_table(net,
 435                                         nf_net_netfilter_sysctl_path, table);
 436         if (!net->ct.sysctl_header)
 437                 goto out_unregister_netfilter;
 438
 439         return 0;
 440
 441 out_unregister_netfilter:
 442         kfree(table);
 443 out_kmemdup:
 444         if (net_eq(net, &init_net))
 445                 unregister_sysctl_table(nf_ct_netfilter_header);
 446 out:
 447         printk("nf_conntrack: can't register to sysctl.\n");
 448         return -ENOMEM;
 449 }
 450
 451 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 452 {
 453         struct ctl_table *table;
 454
 455         if (net_eq(net, &init_net))
 456                 unregister_sysctl_table(nf_ct_netfilter_header);
 457         table = net->ct.sysctl_header->ctl_table_arg;
 458         unregister_net_sysctl_table(net->ct.sysctl_header);
 459         kfree(table);
 460 }
 461 #else
 462 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 463 {
 464         return 0;
 465 }
 466
 467 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 468 {
 469 }
 470 #endif /* CONFIG_SYSCTL */
 471
 472 static int nf_conntrack_net_init(struct net *net)
 473 {
 474         int ret;
 475
 476         ret = nf_conntrack_init(net);
 477         if (ret < 0)
 478                 goto out_init;
 479         ret = nf_conntrack_standalone_init_proc(net);
 480         if (ret < 0)
 481                 goto out_proc;
 482         net->ct.sysctl_checksum = 1;
 483         net->ct.sysctl_log_invalid = 0;
 484         ret = nf_conntrack_standalone_init_sysctl(net);
 485         if (ret < 0)
 486                 goto out_sysctl;
 487         return 0;
 488
 489 out_sysctl:
 490         nf_conntrack_standalone_fini_proc(net);
 491 out_proc:
 492         nf_conntrack_cleanup(net);
 493 out_init:
 494         return ret;
 495 }
 496
 497 static void nf_conntrack_net_exit(struct net *net)
 498 {
 499         nf_conntrack_standalone_fini_sysctl(net);
 500         nf_conntrack_standalone_fini_proc(net);
 501         nf_conntrack_cleanup(net);
 502 }
 503
 504 static struct pernet_operations nf_conntrack_net_ops = {
 505         .init = nf_conntrack_net_init,
 506         .exit = nf_conntrack_net_exit,
 507 };
 508
 509 static int __init nf_conntrack_standalone_init(void)
 510 {
 511         return register_pernet_subsys(&nf_conntrack_net_ops);
 512 }
 513
 514 static void __exit nf_conntrack_standalone_fini(void)
 515 {
 516         unregister_pernet_subsys(&nf_conntrack_net_ops);
 517 }
 518
 519 module_init(nf_conntrack_standalone_init);
 520 module_exit(nf_conntrack_standalone_fini);
 521
 522 /* Some modules need us, but don't depend directly on any symbol.
 523    They should call this. */
 524 void need_conntrack(void)
 525 {
 526 }
 527 EXPORT_SYMBOL_GPL(need_conntrack);