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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             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(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 131                                        .tuple.src.l3num);
 132
 133         NF_CT_ASSERT(l3proto);
 134         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 135                                    .tuple.src.l3num,
 136                                    ct->tuplehash[IP_CT_DIR_ORIGINAL]
 137                                    .tuple.dst.protonum);
 138         NF_CT_ASSERT(l4proto);
 139
 140         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 141                        l3proto->name,
 142                        ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 143                        l4proto->name,
 144                        ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 145                        timer_pending(&ct->timeout)
 146                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 147                 return -ENOSPC;
 148
 149         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 150                 return -ENOSPC;
 151
 152         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 153                         l3proto, l4proto))
 154                 return -ENOSPC;
 155
 156         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 157                 return -ENOSPC;
 158
 159         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 160                 if (seq_printf(s, "[UNREPLIED] "))
 161                         return -ENOSPC;
 162
 163         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 164                         l3proto, l4proto))
 165                 return -ENOSPC;
 166
 167         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 168                 return -ENOSPC;
 169
 170         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 171                 if (seq_printf(s, "[ASSURED] "))
 172                         return -ENOSPC;
 173
 174 #if defined(CONFIG_NF_CONNTRACK_MARK)
 175         if (seq_printf(s, "mark=%u ", ct->mark))
 176                 return -ENOSPC;
 177 #endif
 178
 179 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 180         if (seq_printf(s, "secmark=%u ", ct->secmark))
 181                 return -ENOSPC;
 182 #endif
 183
 184         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 185                 return -ENOSPC;
 186
 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_private(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_private,
 209 };
 210
 211 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 212 {
 213         int cpu;
 214
 215         if (*pos == 0)
 216                 return SEQ_START_TOKEN;
 217
 218         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 219                 if (!cpu_possible(cpu))
 220                         continue;
 221                 *pos = cpu + 1;
 222                 return &per_cpu(nf_conntrack_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         int cpu;
 231
 232         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 233                 if (!cpu_possible(cpu))
 234                         continue;
 235                 *pos = cpu + 1;
 236                 return &per_cpu(nf_conntrack_stat, cpu);
 237         }
 238
 239         return NULL;
 240 }
 241
 242 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 243 {
 244 }
 245
 246 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 247 {
 248         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 249         const struct ip_conntrack_stat *st = v;
 250
 251         if (v == SEQ_START_TOKEN) {
 252                 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");
 253                 return 0;
 254         }
 255
 256         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 257                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 258                    nr_conntracks,
 259                    st->searched,
 260                    st->found,
 261                    st->new,
 262                    st->invalid,
 263                    st->ignore,
 264                    st->delete,
 265                    st->delete_list,
 266                    st->insert,
 267                    st->insert_failed,
 268                    st->drop,
 269                    st->early_drop,
 270                    st->error,
 271
 272                    st->expect_new,
 273                    st->expect_create,
 274                    st->expect_delete
 275                 );
 276         return 0;
 277 }
 278
 279 static const struct seq_operations ct_cpu_seq_ops = {
 280         .start  = ct_cpu_seq_start,
 281         .next   = ct_cpu_seq_next,
 282         .stop   = ct_cpu_seq_stop,
 283         .show   = ct_cpu_seq_show,
 284 };
 285
 286 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 287 {
 288         return seq_open(file, &ct_cpu_seq_ops);
 289 }
 290
 291 static const struct file_operations ct_cpu_seq_fops = {
 292         .owner   = THIS_MODULE,
 293         .open    = ct_cpu_seq_open,
 294         .read    = seq_read,
 295         .llseek  = seq_lseek,
 296         .release = seq_release_private,
 297 };
 298 #endif /* CONFIG_PROC_FS */
 299
 300 /* Sysctl support */
 301
 302 int nf_conntrack_checksum __read_mostly = 1;
 303 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 304
 305 #ifdef CONFIG_SYSCTL
 306 /* Log invalid packets of a given protocol */
 307 static int log_invalid_proto_min = 0;
 308 static int log_invalid_proto_max = 255;
 309
 310 static struct ctl_table_header *nf_ct_sysctl_header;
 311
 312 static ctl_table nf_ct_sysctl_table[] = {
 313         {
 314                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 315                 .procname       = "nf_conntrack_max",
 316                 .data           = &nf_conntrack_max,
 317                 .maxlen         = sizeof(int),
 318                 .mode           = 0644,
 319                 .proc_handler   = &proc_dointvec,
 320         },
 321         {
 322                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 323                 .procname       = "nf_conntrack_count",
 324                 .data           = &nf_conntrack_count,
 325                 .maxlen         = sizeof(int),
 326                 .mode           = 0444,
 327                 .proc_handler   = &proc_dointvec,
 328         },
 329         {
 330                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 331                 .procname       = "nf_conntrack_buckets",
 332                 .data           = &nf_conntrack_htable_size,
 333                 .maxlen         = sizeof(unsigned int),
 334                 .mode           = 0444,
 335                 .proc_handler   = &proc_dointvec,
 336         },
 337         {
 338                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 339                 .procname       = "nf_conntrack_checksum",
 340                 .data           = &nf_conntrack_checksum,
 341                 .maxlen         = sizeof(unsigned int),
 342                 .mode           = 0644,
 343                 .proc_handler   = &proc_dointvec,
 344         },
 345         {
 346                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 347                 .procname       = "nf_conntrack_log_invalid",
 348                 .data           = &nf_ct_log_invalid,
 349                 .maxlen         = sizeof(unsigned int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec_minmax,
 352                 .strategy       = &sysctl_intvec,
 353                 .extra1         = &log_invalid_proto_min,
 354                 .extra2         = &log_invalid_proto_max,
 355         },
 356         {
 357                 .ctl_name       = CTL_UNNUMBERED,
 358                 .procname       = "nf_conntrack_expect_max",
 359                 .data           = &nf_ct_expect_max,
 360                 .maxlen         = sizeof(int),
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dointvec,
 363         },
 364         { .ctl_name = 0 }
 365 };
 366
 367 #define NET_NF_CONNTRACK_MAX 2089
 368
 369 static ctl_table nf_ct_netfilter_table[] = {
 370         {
 371                 .ctl_name       = NET_NETFILTER,
 372                 .procname       = "netfilter",
 373                 .mode           = 0555,
 374                 .child          = nf_ct_sysctl_table,
 375         },
 376         {
 377                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 378                 .procname       = "nf_conntrack_max",
 379                 .data           = &nf_conntrack_max,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dointvec,
 383         },
 384         { .ctl_name = 0 }
 385 };
 386
 387 static struct ctl_path nf_ct_path[] = {
 388         { .procname = "net", .ctl_name = CTL_NET, },
 389         { }
 390 };
 391
 392 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 393 #endif /* CONFIG_SYSCTL */
 394
 395 static int __init nf_conntrack_standalone_init(void)
 396 {
 397 #ifdef CONFIG_PROC_FS
 398         struct proc_dir_entry *proc;
 399 #endif
 400         int ret = 0;
 401
 402         ret = nf_conntrack_init();
 403         if (ret < 0)
 404                 return ret;
 405
 406 #ifdef CONFIG_PROC_FS
 407         proc = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
 408         if (!proc) goto cleanup_init;
 409
 410         if (!proc_create("nf_conntrack", S_IRUGO,
 411                          init_net.proc_net_stat, &ct_cpu_seq_fops))
 412                 goto cleanup_proc;
 413 #endif
 414 #ifdef CONFIG_SYSCTL
 415         nf_ct_sysctl_header = register_sysctl_paths(nf_ct_path,
 416                         nf_ct_netfilter_table);
 417         if (nf_ct_sysctl_header == NULL) {
 418                 printk("nf_conntrack: can't register to sysctl.\n");
 419                 ret = -ENOMEM;
 420                 goto cleanup_proc_stat;
 421         }
 422 #endif
 423         return ret;
 424
 425 #ifdef CONFIG_SYSCTL
 426  cleanup_proc_stat:
 427 #endif
 428 #ifdef CONFIG_PROC_FS
 429         remove_proc_entry("nf_conntrack", init_net. proc_net_stat);
 430  cleanup_proc:
 431         proc_net_remove(&init_net, "nf_conntrack");
 432  cleanup_init:
 433 #endif /* CNFIG_PROC_FS */
 434         nf_conntrack_cleanup();
 435         return ret;
 436 }
 437
 438 static void __exit nf_conntrack_standalone_fini(void)
 439 {
 440 #ifdef CONFIG_SYSCTL
 441         unregister_sysctl_table(nf_ct_sysctl_header);
 442 #endif
 443 #ifdef CONFIG_PROC_FS
 444         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
 445         proc_net_remove(&init_net, "nf_conntrack");
 446 #endif /* CNFIG_PROC_FS */
 447         nf_conntrack_cleanup();
 448 }
 449
 450 module_init(nf_conntrack_standalone_init);
 451 module_exit(nf_conntrack_standalone_fini);
 452
 453 /* Some modules need us, but don't depend directly on any symbol.
 454    They should call this. */
 455 void need_conntrack(void)
 456 {
 457 }
 458 EXPORT_SYMBOL_GPL(need_conntrack);