net/netfilter/nf_conntrack_standalone.c

   1 /* This file contains all the functions required for the standalone
   2    nf_conntrack module.
   3
   4    These are not required by the compatibility layer.
   5 */
   6
   7 /* (C) 1999-2001 Paul `Rusty' Russell
   8  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
  15  *      - generalize L3 protocol dependent part.
  16  *
  17  * Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
  18  */
  19
  20 #include <linux/types.h>
  21 #include <linux/netfilter.h>
  22 #include <linux/module.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/percpu.h>
  27 #include <linux/netdevice.h>
  28 #ifdef CONFIG_SYSCTL
  29 #include <linux/sysctl.h>
  30 #endif
  31
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_core.h>
  34 #include <net/netfilter/nf_conntrack_l3proto.h>
  35 #include <net/netfilter/nf_conntrack_l4proto.h>
  36 #include <net/netfilter/nf_conntrack_expect.h>
  37 #include <net/netfilter/nf_conntrack_helper.h>
  38
  39 #if 0
  40 #define DEBUGP printk
  41 #else
  42 #define DEBUGP(format, args...)
  43 #endif
  44
  45 MODULE_LICENSE("GPL");
  46
  47 #ifdef CONFIG_PROC_FS
  48 int
  49 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
  50             struct nf_conntrack_l3proto *l3proto,
  51             struct nf_conntrack_l4proto *l4proto)
  52 {
  53         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
  54 }
  55
  56 #ifdef CONFIG_NF_CT_ACCT
  57 static unsigned int
  58 seq_print_counters(struct seq_file *s,
  59                    const struct ip_conntrack_counter *counter)
  60 {
  61         return seq_printf(s, "packets=%llu bytes=%llu ",
  62                           (unsigned long long)counter->packets,
  63                           (unsigned long long)counter->bytes);
  64 }
  65 #else
  66 #define seq_print_counters(x, y)        0
  67 #endif
  68
  69 struct ct_iter_state {
  70         unsigned int bucket;
  71 };
  72
  73 static struct list_head *ct_get_first(struct seq_file *seq)
  74 {
  75         struct ct_iter_state *st = seq->private;
  76
  77         for (st->bucket = 0;
  78              st->bucket < nf_conntrack_htable_size;
  79              st->bucket++) {
  80                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
  81                         return nf_conntrack_hash[st->bucket].next;
  82         }
  83         return NULL;
  84 }
  85
  86 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  87 {
  88         struct ct_iter_state *st = seq->private;
  89
  90         head = head->next;
  91         while (head == &nf_conntrack_hash[st->bucket]) {
  92                 if (++st->bucket >= nf_conntrack_htable_size)
  93                         return NULL;
  94                 head = nf_conntrack_hash[st->bucket].next;
  95         }
  96         return head;
  97 }
  98
  99 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 100 {
 101         struct list_head *head = ct_get_first(seq);
 102
 103         if (head)
 104                 while (pos && (head = ct_get_next(seq, head)))
 105                         pos--;
 106         return pos ? NULL : head;
 107 }
 108
 109 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 110 {
 111         read_lock_bh(&nf_conntrack_lock);
 112         return ct_get_idx(seq, *pos);
 113 }
 114
 115 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 116 {
 117         (*pos)++;
 118         return ct_get_next(s, v);
 119 }
 120
 121 static void ct_seq_stop(struct seq_file *s, void *v)
 122 {
 123         read_unlock_bh(&nf_conntrack_lock);
 124 }
 125
 126 /* return 0 on success, 1 in case of error */
 127 static int ct_seq_show(struct seq_file *s, void *v)
 128 {
 129         const struct nf_conntrack_tuple_hash *hash = v;
 130         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 131         struct nf_conntrack_l3proto *l3proto;
 132         struct nf_conntrack_l4proto *l4proto;
 133
 134         NF_CT_ASSERT(conntrack);
 135
 136         /* we only want to print DIR_ORIGINAL */
 137         if (NF_CT_DIRECTION(hash))
 138                 return 0;
 139
 140         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 141                                        .tuple.src.l3num);
 142
 143         NF_CT_ASSERT(l3proto);
 144         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 145                                    .tuple.src.l3num,
 146                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 147                                    .tuple.dst.protonum);
 148         NF_CT_ASSERT(l4proto);
 149
 150         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 151                        l3proto->name,
 152                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 153                        l4proto->name,
 154                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 155                        timer_pending(&conntrack->timeout)
 156                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 157                 return -ENOSPC;
 158
 159         if (l3proto->print_conntrack(s, conntrack))
 160                 return -ENOSPC;
 161
 162         if (l4proto->print_conntrack(s, conntrack))
 163                 return -ENOSPC;
 164
 165         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 166                         l3proto, l4proto))
 167                 return -ENOSPC;
 168
 169         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 170                 return -ENOSPC;
 171
 172         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 173                 if (seq_printf(s, "[UNREPLIED] "))
 174                         return -ENOSPC;
 175
 176         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 177                         l3proto, l4proto))
 178                 return -ENOSPC;
 179
 180         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 181                 return -ENOSPC;
 182
 183         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 184                 if (seq_printf(s, "[ASSURED] "))
 185                         return -ENOSPC;
 186
 187 #if defined(CONFIG_NF_CONNTRACK_MARK)
 188         if (seq_printf(s, "mark=%u ", conntrack->mark))
 189                 return -ENOSPC;
 190 #endif
 191
 192 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 193         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 194                 return -ENOSPC;
 195 #endif
 196
 197         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 198                 return -ENOSPC;
 199
 200         return 0;
 201 }
 202
 203 static struct seq_operations ct_seq_ops = {
 204         .start = ct_seq_start,
 205         .next  = ct_seq_next,
 206         .stop  = ct_seq_stop,
 207         .show  = ct_seq_show
 208 };
 209
 210 static int ct_open(struct inode *inode, struct file *file)
 211 {
 212         struct seq_file *seq;
 213         struct ct_iter_state *st;
 214         int ret;
 215
 216         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 217         if (st == NULL)
 218                 return -ENOMEM;
 219         ret = seq_open(file, &ct_seq_ops);
 220         if (ret)
 221                 goto out_free;
 222         seq          = file->private_data;
 223         seq->private = st;
 224         memset(st, 0, sizeof(struct ct_iter_state));
 225         return ret;
 226 out_free:
 227         kfree(st);
 228         return ret;
 229 }
 230
 231 static struct file_operations ct_file_ops = {
 232         .owner   = THIS_MODULE,
 233         .open    = ct_open,
 234         .read    = seq_read,
 235         .llseek  = seq_lseek,
 236         .release = seq_release_private,
 237 };
 238
 239 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 240 {
 241         int cpu;
 242
 243         if (*pos == 0)
 244                 return SEQ_START_TOKEN;
 245
 246         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 247                 if (!cpu_possible(cpu))
 248                         continue;
 249                 *pos = cpu + 1;
 250                 return &per_cpu(nf_conntrack_stat, cpu);
 251         }
 252
 253         return NULL;
 254 }
 255
 256 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 257 {
 258         int cpu;
 259
 260         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 261                 if (!cpu_possible(cpu))
 262                         continue;
 263                 *pos = cpu + 1;
 264                 return &per_cpu(nf_conntrack_stat, cpu);
 265         }
 266
 267         return NULL;
 268 }
 269
 270 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 271 {
 272 }
 273
 274 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 275 {
 276         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 277         struct ip_conntrack_stat *st = v;
 278
 279         if (v == SEQ_START_TOKEN) {
 280                 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");
 281                 return 0;
 282         }
 283
 284         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 285                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 286                    nr_conntracks,
 287                    st->searched,
 288                    st->found,
 289                    st->new,
 290                    st->invalid,
 291                    st->ignore,
 292                    st->delete,
 293                    st->delete_list,
 294                    st->insert,
 295                    st->insert_failed,
 296                    st->drop,
 297                    st->early_drop,
 298                    st->error,
 299
 300                    st->expect_new,
 301                    st->expect_create,
 302                    st->expect_delete
 303                 );
 304         return 0;
 305 }
 306
 307 static struct seq_operations ct_cpu_seq_ops = {
 308         .start  = ct_cpu_seq_start,
 309         .next   = ct_cpu_seq_next,
 310         .stop   = ct_cpu_seq_stop,
 311         .show   = ct_cpu_seq_show,
 312 };
 313
 314 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 315 {
 316         return seq_open(file, &ct_cpu_seq_ops);
 317 }
 318
 319 static struct file_operations ct_cpu_seq_fops = {
 320         .owner   = THIS_MODULE,
 321         .open    = ct_cpu_seq_open,
 322         .read    = seq_read,
 323         .llseek  = seq_lseek,
 324         .release = seq_release_private,
 325 };
 326 #endif /* CONFIG_PROC_FS */
 327
 328 /* Sysctl support */
 329
 330 int nf_conntrack_checksum __read_mostly = 1;
 331
 332 #ifdef CONFIG_SYSCTL
 333 /* Log invalid packets of a given protocol */
 334 static int log_invalid_proto_min = 0;
 335 static int log_invalid_proto_max = 255;
 336
 337 static struct ctl_table_header *nf_ct_sysctl_header;
 338
 339 static ctl_table nf_ct_sysctl_table[] = {
 340         {
 341                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 342                 .procname       = "nf_conntrack_max",
 343                 .data           = &nf_conntrack_max,
 344                 .maxlen         = sizeof(int),
 345                 .mode           = 0644,
 346                 .proc_handler   = &proc_dointvec,
 347         },
 348         {
 349                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 350                 .procname       = "nf_conntrack_count",
 351                 .data           = &nf_conntrack_count,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0444,
 354                 .proc_handler   = &proc_dointvec,
 355         },
 356         {
 357                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 358                 .procname       = "nf_conntrack_buckets",
 359                 .data           = &nf_conntrack_htable_size,
 360                 .maxlen         = sizeof(unsigned int),
 361                 .mode           = 0444,
 362                 .proc_handler   = &proc_dointvec,
 363         },
 364         {
 365                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 366                 .procname       = "nf_conntrack_checksum",
 367                 .data           = &nf_conntrack_checksum,
 368                 .maxlen         = sizeof(unsigned int),
 369                 .mode           = 0644,
 370                 .proc_handler   = &proc_dointvec,
 371         },
 372         {
 373                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 374                 .procname       = "nf_conntrack_log_invalid",
 375                 .data           = &nf_ct_log_invalid,
 376                 .maxlen         = sizeof(unsigned int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec_minmax,
 379                 .strategy       = &sysctl_intvec,
 380                 .extra1         = &log_invalid_proto_min,
 381                 .extra2         = &log_invalid_proto_max,
 382         },
 383
 384         { .ctl_name = 0 }
 385 };
 386
 387 #define NET_NF_CONNTRACK_MAX 2089
 388
 389 static ctl_table nf_ct_netfilter_table[] = {
 390         {
 391                 .ctl_name       = NET_NETFILTER,
 392                 .procname       = "netfilter",
 393                 .mode           = 0555,
 394                 .child          = nf_ct_sysctl_table,
 395         },
 396         {
 397                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 398                 .procname       = "nf_conntrack_max",
 399                 .data           = &nf_conntrack_max,
 400                 .maxlen         = sizeof(int),
 401                 .mode           = 0644,
 402                 .proc_handler   = &proc_dointvec,
 403         },
 404         { .ctl_name = 0 }
 405 };
 406
 407 static ctl_table nf_ct_net_table[] = {
 408         {
 409                 .ctl_name       = CTL_NET,
 410                 .procname       = "net",
 411                 .mode           = 0555,
 412                 .child          = nf_ct_netfilter_table,
 413         },
 414         { .ctl_name = 0 }
 415 };
 416 EXPORT_SYMBOL(nf_ct_log_invalid);
 417 #endif /* CONFIG_SYSCTL */
 418
 419 static int __init nf_conntrack_standalone_init(void)
 420 {
 421 #ifdef CONFIG_PROC_FS
 422         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 423 #endif
 424         int ret = 0;
 425
 426         ret = nf_conntrack_init();
 427         if (ret < 0)
 428                 return ret;
 429
 430 #ifdef CONFIG_PROC_FS
 431         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 432         if (!proc) goto cleanup_init;
 433
 434         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 435                                         &exp_file_ops);
 436         if (!proc_exp) goto cleanup_proc;
 437
 438         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 439         if (!proc_stat)
 440                 goto cleanup_proc_exp;
 441
 442         proc_stat->proc_fops = &ct_cpu_seq_fops;
 443         proc_stat->owner = THIS_MODULE;
 444 #endif
 445 #ifdef CONFIG_SYSCTL
 446         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 447         if (nf_ct_sysctl_header == NULL) {
 448                 printk("nf_conntrack: can't register to sysctl.\n");
 449                 ret = -ENOMEM;
 450                 goto cleanup_proc_stat;
 451         }
 452 #endif
 453         return ret;
 454
 455 #ifdef CONFIG_SYSCTL
 456  cleanup_proc_stat:
 457 #endif
 458 #ifdef CONFIG_PROC_FS
 459         remove_proc_entry("nf_conntrack", proc_net_stat);
 460  cleanup_proc_exp:
 461         proc_net_remove("nf_conntrack_expect");
 462  cleanup_proc:
 463         proc_net_remove("nf_conntrack");
 464  cleanup_init:
 465 #endif /* CNFIG_PROC_FS */
 466         nf_conntrack_cleanup();
 467         return ret;
 468 }
 469
 470 static void __exit nf_conntrack_standalone_fini(void)
 471 {
 472 #ifdef CONFIG_SYSCTL
 473         unregister_sysctl_table(nf_ct_sysctl_header);
 474 #endif
 475 #ifdef CONFIG_PROC_FS
 476         remove_proc_entry("nf_conntrack", proc_net_stat);
 477         proc_net_remove("nf_conntrack_expect");
 478         proc_net_remove("nf_conntrack");
 479 #endif /* CNFIG_PROC_FS */
 480         nf_conntrack_cleanup();
 481 }
 482
 483 module_init(nf_conntrack_standalone_init);
 484 module_exit(nf_conntrack_standalone_fini);
 485
 486 /* Some modules need us, but don't depend directly on any symbol.
 487    They should call this. */
 488 void need_conntrack(void)
 489 {
 490 }
 491
 492 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 493 EXPORT_SYMBOL_GPL(nf_conntrack_chain);
 494 EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
 495 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 496 EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
 497 EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
 498 EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
 499 EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
 500 #endif
 501 EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
 502 EXPORT_SYMBOL(nf_ct_l3proto_module_put);
 503 EXPORT_SYMBOL(nf_conntrack_l3proto_register);
 504 EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
 505 EXPORT_SYMBOL(nf_conntrack_l4proto_register);
 506 EXPORT_SYMBOL(nf_conntrack_l4proto_unregister);
 507 EXPORT_SYMBOL(nf_ct_invert_tuplepr);
 508 EXPORT_SYMBOL(nf_conntrack_destroyed);
 509 EXPORT_SYMBOL(need_conntrack);
 510 EXPORT_SYMBOL(nf_conntrack_helper_register);
 511 EXPORT_SYMBOL(nf_conntrack_helper_unregister);
 512 EXPORT_SYMBOL(nf_ct_iterate_cleanup);
 513 EXPORT_SYMBOL(__nf_ct_refresh_acct);
 514 EXPORT_SYMBOL(nf_ct_protos);
 515 EXPORT_SYMBOL(__nf_ct_l4proto_find);
 516 EXPORT_SYMBOL(nf_ct_l4proto_find_get);
 517 EXPORT_SYMBOL(nf_ct_l4proto_put);
 518 EXPORT_SYMBOL(nf_ct_l3proto_find_get);
 519 EXPORT_SYMBOL(nf_ct_l3proto_put);
 520 EXPORT_SYMBOL(nf_ct_l3protos);
 521 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 522 EXPORT_SYMBOL(nf_conntrack_expect_alloc);
 523 EXPORT_SYMBOL(nf_conntrack_expect_put);
 524 EXPORT_SYMBOL(nf_conntrack_expect_related);
 525 EXPORT_SYMBOL(nf_conntrack_unexpect_related);
 526 EXPORT_SYMBOL(nf_conntrack_tuple_taken);
 527 EXPORT_SYMBOL(nf_conntrack_htable_size);
 528 EXPORT_SYMBOL(nf_conntrack_lock);
 529 EXPORT_SYMBOL(nf_conntrack_hash);
 530 EXPORT_SYMBOL(nf_conntrack_untracked);
 531 EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
 532 #ifdef CONFIG_IP_NF_NAT_NEEDED
 533 EXPORT_SYMBOL(nf_conntrack_tcp_update);
 534 #endif
 535 EXPORT_SYMBOL(__nf_conntrack_confirm);
 536 EXPORT_SYMBOL(nf_ct_get_tuple);
 537 EXPORT_SYMBOL(nf_ct_invert_tuple);
 538 EXPORT_SYMBOL(nf_conntrack_in);
 539 EXPORT_SYMBOL(__nf_conntrack_attach);
 540 EXPORT_SYMBOL(nf_conntrack_alloc);
 541 EXPORT_SYMBOL(nf_conntrack_free);
 542 EXPORT_SYMBOL(nf_conntrack_flush);
 543 EXPORT_SYMBOL(nf_ct_remove_expectations);
 544 EXPORT_SYMBOL(nf_ct_helper_find_get);
 545 EXPORT_SYMBOL(nf_ct_helper_put);
 546 EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
 547 EXPORT_SYMBOL(__nf_conntrack_find);
 548 EXPORT_SYMBOL(nf_ct_unlink_expect);
 549 EXPORT_SYMBOL(nf_conntrack_hash_insert);
 550 EXPORT_SYMBOL(__nf_conntrack_expect_find);
 551 EXPORT_SYMBOL(nf_conntrack_expect_find);
 552 EXPORT_SYMBOL(nf_conntrack_expect_list);
 553 #if defined(CONFIG_NF_CT_NETLINK) || \
 554     defined(CONFIG_NF_CT_NETLINK_MODULE)
 555 EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
 556 EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
 557 #endif