release/src-rt-6.x/linux/linux-2.6/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 #ifdef CONFIG_SYSCTL
  18 #include <linux/sysctl.h>
  19 #endif
  20
  21 #include <net/netfilter/nf_conntrack.h>
  22 #include <net/netfilter/nf_conntrack_core.h>
  23 #include <net/netfilter/nf_conntrack_l3proto.h>
  24 #include <net/netfilter/nf_conntrack_l4proto.h>
  25 #include <net/netfilter/nf_conntrack_expect.h>
  26 #include <net/netfilter/nf_conntrack_helper.h>
  27
  28 #if 0
  29 #define DEBUGP printk
  30 #else
  31 #define DEBUGP(format, args...)
  32 #endif
  33
  34 MODULE_LICENSE("GPL");
  35
  36 #ifdef CONFIG_PROC_FS
  37 int
  38 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  39             struct nf_conntrack_l3proto *l3proto,
  40             struct nf_conntrack_l4proto *l4proto)
  41 {
  42         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
  43 }
  44 EXPORT_SYMBOL_GPL(print_tuple);
  45
  46 #ifdef CONFIG_NF_CT_ACCT
  47 static unsigned int
  48 seq_print_counters(struct seq_file *s,
  49                    const struct ip_conntrack_counter *counter)
  50 {
  51         return seq_printf(s, "packets=%llu bytes=%llu ",
  52                           (unsigned long long)counter->packets,
  53                           (unsigned long long)counter->bytes);
  54 }
  55 #else
  56 #define seq_print_counters(x, y)        0
  57 #endif
  58
  59 struct ct_iter_state {
  60         unsigned int bucket;
  61 };
  62
  63 static struct list_head *ct_get_first(struct seq_file *seq)
  64 {
  65         struct ct_iter_state *st = seq->private;
  66
  67         for (st->bucket = 0;
  68              st->bucket < nf_conntrack_htable_size;
  69              st->bucket++) {
  70                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
  71                         return nf_conntrack_hash[st->bucket].next;
  72         }
  73         return NULL;
  74 }
  75
  76 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  77 {
  78         struct ct_iter_state *st = seq->private;
  79
  80         head = head->next;
  81         while (head == &nf_conntrack_hash[st->bucket]) {
  82                 if (++st->bucket >= nf_conntrack_htable_size)
  83                         return NULL;
  84                 head = nf_conntrack_hash[st->bucket].next;
  85         }
  86         return head;
  87 }
  88
  89 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
  90 {
  91         struct list_head *head = ct_get_first(seq);
  92
  93         if (head)
  94                 while (pos && (head = ct_get_next(seq, head)))
  95                         pos--;
  96         return pos ? NULL : head;
  97 }
  98
  99 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 100 {
 101         read_lock_bh(&nf_conntrack_lock);
 102         return ct_get_idx(seq, *pos);
 103 }
 104
 105 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 106 {
 107         (*pos)++;
 108         return ct_get_next(s, v);
 109 }
 110
 111 static void ct_seq_stop(struct seq_file *s, void *v)
 112 {
 113         read_unlock_bh(&nf_conntrack_lock);
 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 *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 121         struct nf_conntrack_l3proto *l3proto;
 122         struct nf_conntrack_l4proto *l4proto;
 123
 124         NF_CT_ASSERT(conntrack);
 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(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 131                                        .tuple.src.l3num);
 132
 133         NF_CT_ASSERT(l3proto);
 134         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 135                                    .tuple.src.l3num,
 136                                    conntrack->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                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 143                        l4proto->name,
 144                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 145                        timer_pending(&conntrack->timeout)
 146                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 147                 return -ENOSPC;
 148
 149         if (l4proto->print_conntrack && l4proto->print_conntrack(s, conntrack))
 150                 return -ENOSPC;
 151
 152         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 153                         l3proto, l4proto))
 154                 return -ENOSPC;
 155
 156         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 157                 return -ENOSPC;
 158
 159         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 160                 if (seq_printf(s, "[UNREPLIED] "))
 161                         return -ENOSPC;
 162
 163         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 164                         l3proto, l4proto))
 165                 return -ENOSPC;
 166
 167         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 168                 return -ENOSPC;
 169
 170         if (test_bit(IPS_ASSURED_BIT, &conntrack->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 ", conntrack->mark))
 176                 return -ENOSPC;
 177 #endif
 178
 179 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 180         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 181                 return -ENOSPC;
 182 #endif
 183
 184 #if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
 185         if(conntrack->layer7.app_proto)
 186                 if(seq_printf(s, "l7proto=%s ", conntrack->layer7.app_proto))
 187                         return -ENOSPC;
 188 #endif
 189
 190 #if defined(CONFIG_IP_NF_TARGET_MACSAVE) || defined(CONFIG_IP_NF_TARGET_MACSAVE_MODULE)
 191         if ((*((u32 *)conntrack->macsave) != 0) || (*((u16*)(conntrack->macsave + 4)) != 0)) {
 192                 if (seq_printf(s, "macsave=%02X:%02X:%02X:%02X:%02X:%02X ",
 193                         conntrack->macsave[0], conntrack->macsave[1], conntrack->macsave[2],
 194                         conntrack->macsave[3], conntrack->macsave[4], conntrack->macsave[5]))
 195                         return -ENOSPC;
 196         }
 197 #endif
 198 #if defined(CONFIG_IP_NF_TARGET_BCOUNT) || defined(CONFIG_IP_NF_TARGET_BCOUNT_MODULE)
 199 #if 0
 200         if (conntrack->bcount != 0) {
 201                 if (seq_printf(s, "bcount=%ldK ", conntrack->bcount / 1024))
 202                         return -ENOSPC;
 203         }
 204 #endif
 205 #endif
 206
 207         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 208                 return -ENOSPC;
 209
 210         return 0;
 211 }
 212
 213 static struct seq_operations ct_seq_ops = {
 214         .start = ct_seq_start,
 215         .next  = ct_seq_next,
 216         .stop  = ct_seq_stop,
 217         .show  = ct_seq_show
 218 };
 219
 220 static int ct_open(struct inode *inode, struct file *file)
 221 {
 222         return seq_open_private(file, &ct_seq_ops,
 223                         sizeof(struct ct_iter_state));
 224 }
 225
 226 static const struct file_operations ct_file_ops = {
 227         .owner   = THIS_MODULE,
 228         .open    = ct_open,
 229         .read    = seq_read,
 230         .llseek  = seq_lseek,
 231         .release = seq_release_private,
 232 };
 233
 234 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 235 {
 236         int cpu;
 237
 238         if (*pos == 0)
 239                 return SEQ_START_TOKEN;
 240
 241         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 242                 if (!cpu_possible(cpu))
 243                         continue;
 244                 *pos = cpu + 1;
 245                 return &per_cpu(nf_conntrack_stat, cpu);
 246         }
 247
 248         return NULL;
 249 }
 250
 251 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 252 {
 253         int cpu;
 254
 255         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 256                 if (!cpu_possible(cpu))
 257                         continue;
 258                 *pos = cpu + 1;
 259                 return &per_cpu(nf_conntrack_stat, cpu);
 260         }
 261
 262         return NULL;
 263 }
 264
 265 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 266 {
 267 }
 268
 269 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 270 {
 271         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 272         struct ip_conntrack_stat *st = v;
 273
 274         if (v == SEQ_START_TOKEN) {
 275                 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");
 276                 return 0;
 277         }
 278
 279         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 280                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 281                    nr_conntracks,
 282                    st->searched,
 283                    st->found,
 284                    st->new,
 285                    st->invalid,
 286                    st->ignore,
 287                    st->delete,
 288                    st->delete_list,
 289                    st->insert,
 290                    st->insert_failed,
 291                    st->drop,
 292                    st->early_drop,
 293                    st->error,
 294
 295                    st->expect_new,
 296                    st->expect_create,
 297                    st->expect_delete
 298                 );
 299         return 0;
 300 }
 301
 302 static struct seq_operations ct_cpu_seq_ops = {
 303         .start  = ct_cpu_seq_start,
 304         .next   = ct_cpu_seq_next,
 305         .stop   = ct_cpu_seq_stop,
 306         .show   = ct_cpu_seq_show,
 307 };
 308
 309 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 310 {
 311         return seq_open(file, &ct_cpu_seq_ops);
 312 }
 313
 314 static const struct file_operations ct_cpu_seq_fops = {
 315         .owner   = THIS_MODULE,
 316         .open    = ct_cpu_seq_open,
 317         .read    = seq_read,
 318         .llseek  = seq_lseek,
 319         .release = seq_release_private,
 320 };
 321 #endif /* CONFIG_PROC_FS */
 322
 323 /* Sysctl support */
 324
 325 int nf_conntrack_checksum __read_mostly = 1;
 326 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 327
 328 #ifdef CONFIG_SYSCTL
 329 /* Log invalid packets of a given protocol */
 330 static int log_invalid_proto_min = 0;
 331 static int log_invalid_proto_max = 255;
 332
 333 static struct ctl_table_header *nf_ct_sysctl_header;
 334
 335 static ctl_table nf_ct_sysctl_table[] = {
 336         {
 337                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 338                 .procname       = "nf_conntrack_max",
 339                 .data           = &nf_conntrack_max,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec,
 343         },
 344         {
 345                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 346                 .procname       = "nf_conntrack_count",
 347                 .data           = &nf_conntrack_count,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0444,
 350                 .proc_handler   = &proc_dointvec,
 351         },
 352         {
 353                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 354                 .procname       = "nf_conntrack_buckets",
 355                 .data           = &nf_conntrack_htable_size,
 356                 .maxlen         = sizeof(unsigned int),
 357                 .mode           = 0444,
 358                 .proc_handler   = &proc_dointvec,
 359         },
 360         {
 361                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 362                 .procname       = "nf_conntrack_checksum",
 363                 .data           = &nf_conntrack_checksum,
 364                 .maxlen         = sizeof(unsigned int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368         {
 369                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 370                 .procname       = "nf_conntrack_log_invalid",
 371                 .data           = &nf_ct_log_invalid,
 372                 .maxlen         = sizeof(unsigned int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec_minmax,
 375                 .strategy       = &sysctl_intvec,
 376                 .extra1         = &log_invalid_proto_min,
 377                 .extra2         = &log_invalid_proto_max,
 378         },
 379
 380         { .ctl_name = 0 }
 381 };
 382
 383 #define NET_NF_CONNTRACK_MAX 2089
 384
 385 static ctl_table nf_ct_netfilter_table[] = {
 386         {
 387                 .ctl_name       = NET_NETFILTER,
 388                 .procname       = "netfilter",
 389                 .mode           = 0555,
 390                 .child          = nf_ct_sysctl_table,
 391         },
 392         {
 393                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 394                 .procname       = "nf_conntrack_max",
 395                 .data           = &nf_conntrack_max,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec,
 399         },
 400         { .ctl_name = 0 }
 401 };
 402
 403 static ctl_table nf_ct_net_table[] = {
 404         {
 405                 .ctl_name       = CTL_NET,
 406                 .procname       = "net",
 407                 .mode           = 0555,
 408                 .child          = nf_ct_netfilter_table,
 409         },
 410         { .ctl_name = 0 }
 411 };
 412 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 413 #endif /* CONFIG_SYSCTL */
 414
 415 static int __init nf_conntrack_standalone_init(void)
 416 {
 417 #ifdef CONFIG_PROC_FS
 418         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 419 #endif
 420         int ret = 0;
 421
 422         ret = nf_conntrack_init();
 423         if (ret < 0)
 424                 return ret;
 425
 426 #ifdef CONFIG_PROC_FS
 427         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 428         if (!proc) goto cleanup_init;
 429
 430         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 431                                         &exp_file_ops);
 432         if (!proc_exp) goto cleanup_proc;
 433
 434         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 435         if (!proc_stat)
 436                 goto cleanup_proc_exp;
 437
 438         proc_stat->proc_fops = &ct_cpu_seq_fops;
 439         proc_stat->owner = THIS_MODULE;
 440 #endif
 441 #ifdef CONFIG_SYSCTL
 442         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table);
 443         if (nf_ct_sysctl_header == NULL) {
 444                 printk("nf_conntrack: can't register to sysctl.\n");
 445                 ret = -ENOMEM;
 446                 goto cleanup_proc_stat;
 447         }
 448 #endif
 449         return ret;
 450
 451 #ifdef CONFIG_SYSCTL
 452  cleanup_proc_stat:
 453 #endif
 454 #ifdef CONFIG_PROC_FS
 455         remove_proc_entry("nf_conntrack", proc_net_stat);
 456  cleanup_proc_exp:
 457         proc_net_remove("nf_conntrack_expect");
 458  cleanup_proc:
 459         proc_net_remove("nf_conntrack");
 460  cleanup_init:
 461 #endif /* CNFIG_PROC_FS */
 462         nf_conntrack_cleanup();
 463         return ret;
 464 }
 465
 466 static void __exit nf_conntrack_standalone_fini(void)
 467 {
 468 #ifdef CONFIG_SYSCTL
 469         unregister_sysctl_table(nf_ct_sysctl_header);
 470 #endif
 471 #ifdef CONFIG_PROC_FS
 472         remove_proc_entry("nf_conntrack", proc_net_stat);
 473         proc_net_remove("nf_conntrack_expect");
 474         proc_net_remove("nf_conntrack");
 475 #endif /* CNFIG_PROC_FS */
 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);