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
  29 MODULE_LICENSE("GPL");
  30
  31 #ifdef CONFIG_PROC_FS
  32 int
  33 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  34             const struct nf_conntrack_l3proto *l3proto,
  35             const struct nf_conntrack_l4proto *l4proto)
  36 {
  37         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
  38 }
  39 EXPORT_SYMBOL_GPL(print_tuple);
  40
  41 #ifdef CONFIG_NF_CT_ACCT
  42 static unsigned int
  43 seq_print_counters(struct seq_file *s,
  44                    const struct ip_conntrack_counter *counter)
  45 {
  46         return seq_printf(s, "packets=%llu bytes=%llu ",
  47                           (unsigned long long)counter->packets,
  48                           (unsigned long long)counter->bytes);
  49 }
  50 #else
  51 #define seq_print_counters(x, y)        0
  52 #endif
  53
  54 struct ct_iter_state {
  55         unsigned int bucket;
  56 };
  57
  58 static struct hlist_node *ct_get_first(struct seq_file *seq)
  59 {
  60         struct ct_iter_state *st = seq->private;
  61         struct hlist_node *n;
  62
  63         for (st->bucket = 0;
  64              st->bucket < nf_conntrack_htable_size;
  65              st->bucket++) {
  66                 n = rcu_dereference(nf_conntrack_hash[st->bucket].first);
  67                 if (n)
  68                         return n;
  69         }
  70         return NULL;
  71 }
  72
  73 static struct hlist_node *ct_get_next(struct seq_file *seq,
  74                                       struct hlist_node *head)
  75 {
  76         struct ct_iter_state *st = seq->private;
  77
  78         head = rcu_dereference(head->next);
  79         while (head == NULL) {
  80                 if (++st->bucket >= nf_conntrack_htable_size)
  81                         return NULL;
  82                 head = rcu_dereference(nf_conntrack_hash[st->bucket].first);
  83         }
  84         return head;
  85 }
  86
  87 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  88 {
  89         struct hlist_node *head = ct_get_first(seq);
  90
  91         if (head)
  92                 while (pos && (head = ct_get_next(seq, head)))
  93                         pos--;
  94         return pos ? NULL : head;
  95 }
  96
  97 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  98         __acquires(RCU)
  99 {
 100         rcu_read_lock();
 101         return ct_get_idx(seq, *pos);
 102 }
 103
 104 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 105 {
 106         (*pos)++;
 107         return ct_get_next(s, v);
 108 }
 109
 110 static void ct_seq_stop(struct seq_file *s, void *v)
 111         __releases(RCU)
 112 {
 113         rcu_read_unlock();
 114 }
 115
 116 /* return 0 on success, 1 in case of error */
 117 static int ct_seq_show(struct seq_file *s, void *v)
 118 {
 119         const struct nf_conntrack_tuple_hash *hash = v;
 120         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 121         const struct nf_conntrack_l3proto *l3proto;
 122         const struct nf_conntrack_l4proto *l4proto;
 123
 124         NF_CT_ASSERT(ct);
 125
 126         /* we only want to print DIR_ORIGINAL */
 127         if (NF_CT_DIRECTION(hash))
 128                 return 0;
 129
 130         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 131         NF_CT_ASSERT(l3proto);
 132         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 133         NF_CT_ASSERT(l4proto);
 134
 135         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 136                        l3proto->name, nf_ct_l3num(ct),
 137                        l4proto->name, nf_ct_protonum(ct),
 138                        timer_pending(&ct->timeout)
 139                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 140                 return -ENOSPC;
 141
 142         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 143                 return -ENOSPC;
 144
 145         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 146                         l3proto, l4proto))
 147                 return -ENOSPC;
 148
 149         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 150                 return -ENOSPC;
 151
 152         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 153                 if (seq_printf(s, "[UNREPLIED] "))
 154                         return -ENOSPC;
 155
 156         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 157                         l3proto, l4proto))
 158                 return -ENOSPC;
 159
 160         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 161                 return -ENOSPC;
 162
 163         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 164                 if (seq_printf(s, "[ASSURED] "))
 165                         return -ENOSPC;
 166
 167 #if defined(CONFIG_NF_CONNTRACK_MARK)
 168         if (seq_printf(s, "mark=%u ", ct->mark))
 169                 return -ENOSPC;
 170 #endif
 171
 172 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 173         if (seq_printf(s, "secmark=%u ", ct->secmark))
 174                 return -ENOSPC;
 175 #endif
 176
 177         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 178                 return -ENOSPC;
 179
 180         return 0;
 181 }
 182
 183 static const struct seq_operations ct_seq_ops = {
 184         .start = ct_seq_start,
 185         .next  = ct_seq_next,
 186         .stop  = ct_seq_stop,
 187         .show  = ct_seq_show
 188 };
 189
 190 static int ct_open(struct inode *inode, struct file *file)
 191 {
 192         return seq_open_private(file, &ct_seq_ops,
 193                         sizeof(struct ct_iter_state));
 194 }
 195
 196 static const struct file_operations ct_file_ops = {
 197         .owner   = THIS_MODULE,
 198         .open    = ct_open,
 199         .read    = seq_read,
 200         .llseek  = seq_lseek,
 201         .release = seq_release_private,
 202 };
 203
 204 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 205 {
 206         int cpu;
 207
 208         if (*pos == 0)
 209                 return SEQ_START_TOKEN;
 210
 211         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 212                 if (!cpu_possible(cpu))
 213                         continue;
 214                 *pos = cpu + 1;
 215                 return &per_cpu(nf_conntrack_stat, cpu);
 216         }
 217
 218         return NULL;
 219 }
 220
 221 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 222 {
 223         int cpu;
 224
 225         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 226                 if (!cpu_possible(cpu))
 227                         continue;
 228                 *pos = cpu + 1;
 229                 return &per_cpu(nf_conntrack_stat, cpu);
 230         }
 231
 232         return NULL;
 233 }
 234
 235 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 236 {
 237 }
 238
 239 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 240 {
 241         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 242         const struct ip_conntrack_stat *st = v;
 243
 244         if (v == SEQ_START_TOKEN) {
 245                 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");
 246                 return 0;
 247         }
 248
 249         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 250                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 251                    nr_conntracks,
 252                    st->searched,
 253                    st->found,
 254                    st->new,
 255                    st->invalid,
 256                    st->ignore,
 257                    st->delete,
 258                    st->delete_list,
 259                    st->insert,
 260                    st->insert_failed,
 261                    st->drop,
 262                    st->early_drop,
 263                    st->error,
 264
 265                    st->expect_new,
 266                    st->expect_create,
 267                    st->expect_delete
 268                 );
 269         return 0;
 270 }
 271
 272 static const struct seq_operations ct_cpu_seq_ops = {
 273         .start  = ct_cpu_seq_start,
 274         .next   = ct_cpu_seq_next,
 275         .stop   = ct_cpu_seq_stop,
 276         .show   = ct_cpu_seq_show,
 277 };
 278
 279 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 280 {
 281         return seq_open(file, &ct_cpu_seq_ops);
 282 }
 283
 284 static const struct file_operations ct_cpu_seq_fops = {
 285         .owner   = THIS_MODULE,
 286         .open    = ct_cpu_seq_open,
 287         .read    = seq_read,
 288         .llseek  = seq_lseek,
 289         .release = seq_release,
 290 };
 291
 292 static int nf_conntrack_standalone_init_proc(void)
 293 {
 294         struct proc_dir_entry *pde;
 295
 296         pde = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
 297         if (!pde)
 298                 goto out_nf_conntrack;
 299         pde = create_proc_entry("nf_conntrack", S_IRUGO, init_net.proc_net_stat);
 300         if (!pde)
 301                 goto out_stat_nf_conntrack;
 302         pde->proc_fops = &ct_cpu_seq_fops;
 303         pde->owner = THIS_MODULE;
 304         return 0;
 305
 306 out_stat_nf_conntrack:
 307         proc_net_remove(&init_net, "nf_conntrack");
 308 out_nf_conntrack:
 309         return -ENOMEM;
 310 }
 311
 312 static void nf_conntrack_standalone_fini_proc(void)
 313 {
 314         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
 315         proc_net_remove(&init_net, "nf_conntrack");
 316 }
 317 #else
 318 static int nf_conntrack_standalone_init_proc(void)
 319 {
 320         return 0;
 321 }
 322
 323 static void nf_conntrack_standalone_fini_proc(void)
 324 {
 325 }
 326 #endif /* CONFIG_PROC_FS */
 327
 328 /* Sysctl support */
 329
 330 int nf_conntrack_checksum __read_mostly = 1;
 331 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 332
 333 #ifdef CONFIG_SYSCTL
 334 /* Log invalid packets of a given protocol */
 335 static int log_invalid_proto_min = 0;
 336 static int log_invalid_proto_max = 255;
 337
 338 static struct ctl_table_header *nf_ct_sysctl_header;
 339
 340 static ctl_table nf_ct_sysctl_table[] = {
 341         {
 342                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 343                 .procname       = "nf_conntrack_max",
 344                 .data           = &nf_conntrack_max,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec,
 348         },
 349         {
 350                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 351                 .procname       = "nf_conntrack_count",
 352                 .data           = &nf_conntrack_count,
 353                 .maxlen         = sizeof(int),
 354                 .mode           = 0444,
 355                 .proc_handler   = &proc_dointvec,
 356         },
 357         {
 358                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 359                 .procname       = "nf_conntrack_buckets",
 360                 .data           = &nf_conntrack_htable_size,
 361                 .maxlen         = sizeof(unsigned int),
 362                 .mode           = 0444,
 363                 .proc_handler   = &proc_dointvec,
 364         },
 365         {
 366                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 367                 .procname       = "nf_conntrack_checksum",
 368                 .data           = &nf_conntrack_checksum,
 369                 .maxlen         = sizeof(unsigned int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec,
 372         },
 373         {
 374                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 375                 .procname       = "nf_conntrack_log_invalid",
 376                 .data           = &nf_ct_log_invalid,
 377                 .maxlen         = sizeof(unsigned int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec_minmax,
 380                 .strategy       = &sysctl_intvec,
 381                 .extra1         = &log_invalid_proto_min,
 382                 .extra2         = &log_invalid_proto_max,
 383         },
 384         {
 385                 .ctl_name       = CTL_UNNUMBERED,
 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         { .ctl_name = 0 }
 393 };
 394
 395 #define NET_NF_CONNTRACK_MAX 2089
 396
 397 static ctl_table nf_ct_netfilter_table[] = {
 398         {
 399                 .ctl_name       = NET_NETFILTER,
 400                 .procname       = "netfilter",
 401                 .mode           = 0555,
 402                 .child          = nf_ct_sysctl_table,
 403         },
 404         {
 405                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 406                 .procname       = "nf_conntrack_max",
 407                 .data           = &nf_conntrack_max,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec,
 411         },
 412         { .ctl_name = 0 }
 413 };
 414
 415 static struct ctl_path nf_ct_path[] = {
 416         { .procname = "net", .ctl_name = CTL_NET, },
 417         { }
 418 };
 419
 420 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 421
 422 static int nf_conntrack_standalone_init_sysctl(void)
 423 {
 424         nf_ct_sysctl_header =
 425                 register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
 426         if (nf_ct_sysctl_header == NULL) {
 427                 printk("nf_conntrack: can't register to sysctl.\n");
 428                 return -ENOMEM;
 429         }
 430         return 0;
 431
 432 }
 433
 434 static void nf_conntrack_standalone_fini_sysctl(void)
 435 {
 436         unregister_sysctl_table(nf_ct_sysctl_header);
 437 }
 438 #else
 439 static int nf_conntrack_standalone_init_sysctl(void)
 440 {
 441         return 0;
 442 }
 443
 444 static void nf_conntrack_standalone_fini_sysctl(void)
 445 {
 446 }
 447 #endif /* CONFIG_SYSCTL */
 448
 449 static int __init nf_conntrack_standalone_init(void)
 450 {
 451         int ret;
 452
 453         ret = nf_conntrack_init();
 454         if (ret < 0)
 455                 goto out;
 456         ret = nf_conntrack_standalone_init_proc();
 457         if (ret < 0)
 458                 goto out_proc;
 459         ret = nf_conntrack_standalone_init_sysctl();
 460         if (ret < 0)
 461                 goto out_sysctl;
 462         return 0;
 463
 464 out_sysctl:
 465         nf_conntrack_standalone_fini_proc();
 466 out_proc:
 467         nf_conntrack_cleanup();
 468 out:
 469         return ret;
 470 }
 471
 472 static void __exit nf_conntrack_standalone_fini(void)
 473 {
 474         nf_conntrack_standalone_fini_sysctl();
 475         nf_conntrack_standalone_fini_proc();
 476         nf_conntrack_cleanup();
 477 }
 478
 479 module_init(nf_conntrack_standalone_init);
 480 module_exit(nf_conntrack_standalone_fini);
 481
 482 /* Some modules need us, but don't depend directly on any symbol.
 483    They should call this. */
 484 void need_conntrack(void)
 485 {
 486 }
 487 EXPORT_SYMBOL_GPL(need_conntrack);