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   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             struct nf_conntrack_l3proto *l3proto,
  35             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
  62         for (st->bucket = 0;
  63              st->bucket < nf_conntrack_htable_size;
  64              st->bucket++) {
  65                 if (!hlist_empty(&nf_conntrack_hash[st->bucket]))
  66                         return nf_conntrack_hash[st->bucket].first;
  67         }
  68         return NULL;
  69 }
  70
  71 static struct hlist_node *ct_get_next(struct seq_file *seq,
  72                                       struct hlist_node *head)
  73 {
  74         struct ct_iter_state *st = seq->private;
  75
  76         head = head->next;
  77         while (head == NULL) {
  78                 if (++st->bucket >= nf_conntrack_htable_size)
  79                         return NULL;
  80                 head = nf_conntrack_hash[st->bucket].first;
  81         }
  82         return head;
  83 }
  84
  85 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  86 {
  87         struct hlist_node *head = ct_get_first(seq);
  88
  89         if (head)
  90                 while (pos && (head = ct_get_next(seq, head)))
  91                         pos--;
  92         return pos ? NULL : head;
  93 }
  94
  95 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  96 {
  97         read_lock_bh(&nf_conntrack_lock);
  98         return ct_get_idx(seq, *pos);
  99 }
 100
 101 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 102 {
 103         (*pos)++;
 104         return ct_get_next(s, v);
 105 }
 106
 107 static void ct_seq_stop(struct seq_file *s, void *v)
 108 {
 109         read_unlock_bh(&nf_conntrack_lock);
 110 }
 111
 112 /* return 0 on success, 1 in case of error */
 113 static int ct_seq_show(struct seq_file *s, void *v)
 114 {
 115         const struct nf_conntrack_tuple_hash *hash = v;
 116         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 117         struct nf_conntrack_l3proto *l3proto;
 118         struct nf_conntrack_l4proto *l4proto;
 119
 120         NF_CT_ASSERT(conntrack);
 121
 122         /* we only want to print DIR_ORIGINAL */
 123         if (NF_CT_DIRECTION(hash))
 124                 return 0;
 125
 126         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 127                                        .tuple.src.l3num);
 128
 129         NF_CT_ASSERT(l3proto);
 130         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 131                                    .tuple.src.l3num,
 132                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 133                                    .tuple.dst.protonum);
 134         NF_CT_ASSERT(l4proto);
 135
 136         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 137                        l3proto->name,
 138                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 139                        l4proto->name,
 140                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 141                        timer_pending(&conntrack->timeout)
 142                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 143                 return -ENOSPC;
 144
 145         if (l4proto->print_conntrack && l4proto->print_conntrack(s, conntrack))
 146                 return -ENOSPC;
 147
 148         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 149                         l3proto, l4proto))
 150                 return -ENOSPC;
 151
 152         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 153                 return -ENOSPC;
 154
 155         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 156                 if (seq_printf(s, "[UNREPLIED] "))
 157                         return -ENOSPC;
 158
 159         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 160                         l3proto, l4proto))
 161                 return -ENOSPC;
 162
 163         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 164                 return -ENOSPC;
 165
 166         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 167                 if (seq_printf(s, "[ASSURED] "))
 168                         return -ENOSPC;
 169
 170 #if defined(CONFIG_NF_CONNTRACK_MARK)
 171         if (seq_printf(s, "mark=%u ", conntrack->mark))
 172                 return -ENOSPC;
 173 #endif
 174
 175 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 176         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 177                 return -ENOSPC;
 178 #endif
 179
 180         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 181                 return -ENOSPC;
 182
 183         return 0;
 184 }
 185
 186 static const struct seq_operations ct_seq_ops = {
 187         .start = ct_seq_start,
 188         .next  = ct_seq_next,
 189         .stop  = ct_seq_stop,
 190         .show  = ct_seq_show
 191 };
 192
 193 static int ct_open(struct inode *inode, struct file *file)
 194 {
 195         return seq_open_private(file, &ct_seq_ops,
 196                         sizeof(struct ct_iter_state));
 197 }
 198
 199 static const struct file_operations ct_file_ops = {
 200         .owner   = THIS_MODULE,
 201         .open    = ct_open,
 202         .read    = seq_read,
 203         .llseek  = seq_lseek,
 204         .release = seq_release_private,
 205 };
 206
 207 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 208 {
 209         int cpu;
 210
 211         if (*pos == 0)
 212                 return SEQ_START_TOKEN;
 213
 214         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 215                 if (!cpu_possible(cpu))
 216                         continue;
 217                 *pos = cpu + 1;
 218                 return &per_cpu(nf_conntrack_stat, cpu);
 219         }
 220
 221         return NULL;
 222 }
 223
 224 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 225 {
 226         int cpu;
 227
 228         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 229                 if (!cpu_possible(cpu))
 230                         continue;
 231                 *pos = cpu + 1;
 232                 return &per_cpu(nf_conntrack_stat, cpu);
 233         }
 234
 235         return NULL;
 236 }
 237
 238 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 239 {
 240 }
 241
 242 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 243 {
 244         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 245         struct ip_conntrack_stat *st = v;
 246
 247         if (v == SEQ_START_TOKEN) {
 248                 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");
 249                 return 0;
 250         }
 251
 252         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 253                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 254                    nr_conntracks,
 255                    st->searched,
 256                    st->found,
 257                    st->new,
 258                    st->invalid,
 259                    st->ignore,
 260                    st->delete,
 261                    st->delete_list,
 262                    st->insert,
 263                    st->insert_failed,
 264                    st->drop,
 265                    st->early_drop,
 266                    st->error,
 267
 268                    st->expect_new,
 269                    st->expect_create,
 270                    st->expect_delete
 271                 );
 272         return 0;
 273 }
 274
 275 static const struct seq_operations ct_cpu_seq_ops = {
 276         .start  = ct_cpu_seq_start,
 277         .next   = ct_cpu_seq_next,
 278         .stop   = ct_cpu_seq_stop,
 279         .show   = ct_cpu_seq_show,
 280 };
 281
 282 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 283 {
 284         return seq_open(file, &ct_cpu_seq_ops);
 285 }
 286
 287 static const struct file_operations ct_cpu_seq_fops = {
 288         .owner   = THIS_MODULE,
 289         .open    = ct_cpu_seq_open,
 290         .read    = seq_read,
 291         .llseek  = seq_lseek,
 292         .release = seq_release_private,
 293 };
 294 #endif /* CONFIG_PROC_FS */
 295
 296 /* Sysctl support */
 297
 298 int nf_conntrack_checksum __read_mostly = 1;
 299 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 300
 301 #ifdef CONFIG_SYSCTL
 302 /* Log invalid packets of a given protocol */
 303 static int log_invalid_proto_min = 0;
 304 static int log_invalid_proto_max = 255;
 305
 306 static struct ctl_table_header *nf_ct_sysctl_header;
 307
 308 static ctl_table nf_ct_sysctl_table[] = {
 309         {
 310                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 311                 .procname       = "nf_conntrack_max",
 312                 .data           = &nf_conntrack_max,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec,
 316         },
 317         {
 318                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 319                 .procname       = "nf_conntrack_count",
 320                 .data           = &nf_conntrack_count,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0444,
 323                 .proc_handler   = &proc_dointvec,
 324         },
 325         {
 326                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 327                 .procname       = "nf_conntrack_buckets",
 328                 .data           = &nf_conntrack_htable_size,
 329                 .maxlen         = sizeof(unsigned int),
 330                 .mode           = 0444,
 331                 .proc_handler   = &proc_dointvec,
 332         },
 333         {
 334                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 335                 .procname       = "nf_conntrack_checksum",
 336                 .data           = &nf_conntrack_checksum,
 337                 .maxlen         = sizeof(unsigned int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec,
 340         },
 341         {
 342                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 343                 .procname       = "nf_conntrack_log_invalid",
 344                 .data           = &nf_ct_log_invalid,
 345                 .maxlen         = sizeof(unsigned int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec_minmax,
 348                 .strategy       = &sysctl_intvec,
 349                 .extra1         = &log_invalid_proto_min,
 350                 .extra2         = &log_invalid_proto_max,
 351         },
 352         {
 353                 .ctl_name       = CTL_UNNUMBERED,
 354                 .procname       = "nf_conntrack_expect_max",
 355                 .data           = &nf_ct_expect_max,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360         { .ctl_name = 0 }
 361 };
 362
 363 #define NET_NF_CONNTRACK_MAX 2089
 364
 365 static ctl_table nf_ct_netfilter_table[] = {
 366         {
 367                 .ctl_name       = NET_NETFILTER,
 368                 .procname       = "netfilter",
 369                 .mode           = 0555,
 370                 .child          = nf_ct_sysctl_table,
 371         },
 372         {
 373                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 374                 .procname       = "nf_conntrack_max",
 375                 .data           = &nf_conntrack_max,
 376                 .maxlen         = sizeof(int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec,
 379         },
 380         { .ctl_name = 0 }
 381 };
 382
 383 struct ctl_path nf_ct_path[] = {
 384         { .procname = "net", .ctl_name = CTL_NET, },
 385         { }
 386 };
 387
 388 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 389 #endif /* CONFIG_SYSCTL */
 390
 391 static int __init nf_conntrack_standalone_init(void)
 392 {
 393 #ifdef CONFIG_PROC_FS
 394         struct proc_dir_entry *proc, *proc_stat;
 395 #endif
 396         int ret = 0;
 397
 398         ret = nf_conntrack_init();
 399         if (ret < 0)
 400                 return ret;
 401
 402 #ifdef CONFIG_PROC_FS
 403         proc = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
 404         if (!proc) goto cleanup_init;
 405
 406         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, init_net.proc_net_stat);
 407         if (!proc_stat)
 408                 goto cleanup_proc;
 409
 410         proc_stat->proc_fops = &ct_cpu_seq_fops;
 411         proc_stat->owner = THIS_MODULE;
 412 #endif
 413 #ifdef CONFIG_SYSCTL
 414         nf_ct_sysctl_header = register_sysctl_paths(nf_ct_path,
 415                         nf_ct_netfilter_table);
 416         if (nf_ct_sysctl_header == NULL) {
 417                 printk("nf_conntrack: can't register to sysctl.\n");
 418                 ret = -ENOMEM;
 419                 goto cleanup_proc_stat;
 420         }
 421 #endif
 422         return ret;
 423
 424 #ifdef CONFIG_SYSCTL
 425  cleanup_proc_stat:
 426 #endif
 427 #ifdef CONFIG_PROC_FS
 428         remove_proc_entry("nf_conntrack", init_net. proc_net_stat);
 429  cleanup_proc:
 430         proc_net_remove(&init_net, "nf_conntrack");
 431  cleanup_init:
 432 #endif /* CNFIG_PROC_FS */
 433         nf_conntrack_cleanup();
 434         return ret;
 435 }
 436
 437 static void __exit nf_conntrack_standalone_fini(void)
 438 {
 439 #ifdef CONFIG_SYSCTL
 440         unregister_sysctl_table(nf_ct_sysctl_header);
 441 #endif
 442 #ifdef CONFIG_PROC_FS
 443         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
 444         proc_net_remove(&init_net, "nf_conntrack");
 445 #endif /* CNFIG_PROC_FS */
 446         nf_conntrack_cleanup();
 447 }
 448
 449 module_init(nf_conntrack_standalone_init);
 450 module_exit(nf_conntrack_standalone_fini);
 451
 452 /* Some modules need us, but don't depend directly on any symbol.
 453    They should call this. */
 454 void need_conntrack(void)
 455 {
 456 }
 457 EXPORT_SYMBOL_GPL(need_conntrack);