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