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