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   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 EXPORT_SYMBOL_GPL(print_tuple);
  56
  57 #ifdef CONFIG_NF_CT_ACCT
  58 static unsigned int
  59 seq_print_counters(struct seq_file *s,
  60                    const struct ip_conntrack_counter *counter)
  61 {
  62         return seq_printf(s, "packets=%llu bytes=%llu ",
  63                           (unsigned long long)counter->packets,
  64                           (unsigned long long)counter->bytes);
  65 }
  66 #else
  67 #define seq_print_counters(x, y)        0
  68 #endif
  69
  70 struct ct_iter_state {
  71         unsigned int bucket;
  72 };
  73
  74 static struct list_head *ct_get_first(struct seq_file *seq)
  75 {
  76         struct ct_iter_state *st = seq->private;
  77
  78         for (st->bucket = 0;
  79              st->bucket < nf_conntrack_htable_size;
  80              st->bucket++) {
  81                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
  82                         return nf_conntrack_hash[st->bucket].next;
  83         }
  84         return NULL;
  85 }
  86
  87 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  88 {
  89         struct ct_iter_state *st = seq->private;
  90
  91         head = head->next;
  92         while (head == &nf_conntrack_hash[st->bucket]) {
  93                 if (++st->bucket >= nf_conntrack_htable_size)
  94                         return NULL;
  95                 head = nf_conntrack_hash[st->bucket].next;
  96         }
  97         return head;
  98 }
  99
 100 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
 101 {
 102         struct list_head *head = ct_get_first(seq);
 103
 104         if (head)
 105                 while (pos && (head = ct_get_next(seq, head)))
 106                         pos--;
 107         return pos ? NULL : head;
 108 }
 109
 110 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
 111 {
 112         read_lock_bh(&nf_conntrack_lock);
 113         return ct_get_idx(seq, *pos);
 114 }
 115
 116 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 117 {
 118         (*pos)++;
 119         return ct_get_next(s, v);
 120 }
 121
 122 static void ct_seq_stop(struct seq_file *s, void *v)
 123 {
 124         read_unlock_bh(&nf_conntrack_lock);
 125 }
 126
 127 /* return 0 on success, 1 in case of error */
 128 static int ct_seq_show(struct seq_file *s, void *v)
 129 {
 130         const struct nf_conntrack_tuple_hash *hash = v;
 131         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 132         struct nf_conntrack_l3proto *l3proto;
 133         struct nf_conntrack_l4proto *l4proto;
 134
 135         NF_CT_ASSERT(conntrack);
 136
 137         /* we only want to print DIR_ORIGINAL */
 138         if (NF_CT_DIRECTION(hash))
 139                 return 0;
 140
 141         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 142                                        .tuple.src.l3num);
 143
 144         NF_CT_ASSERT(l3proto);
 145         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 146                                    .tuple.src.l3num,
 147                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 148                                    .tuple.dst.protonum);
 149         NF_CT_ASSERT(l4proto);
 150
 151         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 152                        l3proto->name,
 153                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 154                        l4proto->name,
 155                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 156                        timer_pending(&conntrack->timeout)
 157                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 158                 return -ENOSPC;
 159
 160         if (l3proto->print_conntrack(s, conntrack))
 161                 return -ENOSPC;
 162
 163         if (l4proto->print_conntrack(s, conntrack))
 164                 return -ENOSPC;
 165
 166         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 167                         l3proto, l4proto))
 168                 return -ENOSPC;
 169
 170         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 171                 return -ENOSPC;
 172
 173         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 174                 if (seq_printf(s, "[UNREPLIED] "))
 175                         return -ENOSPC;
 176
 177         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 178                         l3proto, l4proto))
 179                 return -ENOSPC;
 180
 181         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 182                 return -ENOSPC;
 183
 184         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 185                 if (seq_printf(s, "[ASSURED] "))
 186                         return -ENOSPC;
 187
 188 #if defined(CONFIG_NF_CONNTRACK_MARK)
 189         if (seq_printf(s, "mark=%u ", conntrack->mark))
 190                 return -ENOSPC;
 191 #endif
 192
 193 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 194         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 195                 return -ENOSPC;
 196 #endif
 197
 198         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 199                 return -ENOSPC;
 200
 201         return 0;
 202 }
 203
 204 static struct seq_operations ct_seq_ops = {
 205         .start = ct_seq_start,
 206         .next  = ct_seq_next,
 207         .stop  = ct_seq_stop,
 208         .show  = ct_seq_show
 209 };
 210
 211 static int ct_open(struct inode *inode, struct file *file)
 212 {
 213         struct seq_file *seq;
 214         struct ct_iter_state *st;
 215         int ret;
 216
 217         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 218         if (st == NULL)
 219                 return -ENOMEM;
 220         ret = seq_open(file, &ct_seq_ops);
 221         if (ret)
 222                 goto out_free;
 223         seq          = file->private_data;
 224         seq->private = st;
 225         memset(st, 0, sizeof(struct ct_iter_state));
 226         return ret;
 227 out_free:
 228         kfree(st);
 229         return ret;
 230 }
 231
 232 static const struct file_operations ct_file_ops = {
 233         .owner   = THIS_MODULE,
 234         .open    = ct_open,
 235         .read    = seq_read,
 236         .llseek  = seq_lseek,
 237         .release = seq_release_private,
 238 };
 239
 240 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 241 {
 242         int cpu;
 243
 244         if (*pos == 0)
 245                 return SEQ_START_TOKEN;
 246
 247         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 248                 if (!cpu_possible(cpu))
 249                         continue;
 250                 *pos = cpu + 1;
 251                 return &per_cpu(nf_conntrack_stat, cpu);
 252         }
 253
 254         return NULL;
 255 }
 256
 257 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 258 {
 259         int cpu;
 260
 261         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 262                 if (!cpu_possible(cpu))
 263                         continue;
 264                 *pos = cpu + 1;
 265                 return &per_cpu(nf_conntrack_stat, cpu);
 266         }
 267
 268         return NULL;
 269 }
 270
 271 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 272 {
 273 }
 274
 275 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 276 {
 277         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 278         struct ip_conntrack_stat *st = v;
 279
 280         if (v == SEQ_START_TOKEN) {
 281                 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");
 282                 return 0;
 283         }
 284
 285         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 286                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 287                    nr_conntracks,
 288                    st->searched,
 289                    st->found,
 290                    st->new,
 291                    st->invalid,
 292                    st->ignore,
 293                    st->delete,
 294                    st->delete_list,
 295                    st->insert,
 296                    st->insert_failed,
 297                    st->drop,
 298                    st->early_drop,
 299                    st->error,
 300
 301                    st->expect_new,
 302                    st->expect_create,
 303                    st->expect_delete
 304                 );
 305         return 0;
 306 }
 307
 308 static struct seq_operations ct_cpu_seq_ops = {
 309         .start  = ct_cpu_seq_start,
 310         .next   = ct_cpu_seq_next,
 311         .stop   = ct_cpu_seq_stop,
 312         .show   = ct_cpu_seq_show,
 313 };
 314
 315 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 316 {
 317         return seq_open(file, &ct_cpu_seq_ops);
 318 }
 319
 320 static const struct file_operations ct_cpu_seq_fops = {
 321         .owner   = THIS_MODULE,
 322         .open    = ct_cpu_seq_open,
 323         .read    = seq_read,
 324         .llseek  = seq_lseek,
 325         .release = seq_release_private,
 326 };
 327 #endif /* CONFIG_PROC_FS */
 328
 329 /* Sysctl support */
 330
 331 int nf_conntrack_checksum __read_mostly = 1;
 332 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 333
 334 #ifdef CONFIG_SYSCTL
 335 /* Log invalid packets of a given protocol */
 336 static int log_invalid_proto_min = 0;
 337 static int log_invalid_proto_max = 255;
 338
 339 static struct ctl_table_header *nf_ct_sysctl_header;
 340
 341 static ctl_table nf_ct_sysctl_table[] = {
 342         {
 343                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 344                 .procname       = "nf_conntrack_max",
 345                 .data           = &nf_conntrack_max,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec,
 349         },
 350         {
 351                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 352                 .procname       = "nf_conntrack_count",
 353                 .data           = &nf_conntrack_count,
 354                 .maxlen         = sizeof(int),
 355                 .mode           = 0444,
 356                 .proc_handler   = &proc_dointvec,
 357         },
 358         {
 359                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 360                 .procname       = "nf_conntrack_buckets",
 361                 .data           = &nf_conntrack_htable_size,
 362                 .maxlen         = sizeof(unsigned int),
 363                 .mode           = 0444,
 364                 .proc_handler   = &proc_dointvec,
 365         },
 366         {
 367                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 368                 .procname       = "nf_conntrack_checksum",
 369                 .data           = &nf_conntrack_checksum,
 370                 .maxlen         = sizeof(unsigned int),
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dointvec,
 373         },
 374         {
 375                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 376                 .procname       = "nf_conntrack_log_invalid",
 377                 .data           = &nf_ct_log_invalid,
 378                 .maxlen         = sizeof(unsigned int),
 379                 .mode           = 0644,
 380                 .proc_handler   = &proc_dointvec_minmax,
 381                 .strategy       = &sysctl_intvec,
 382                 .extra1         = &log_invalid_proto_min,
 383                 .extra2         = &log_invalid_proto_max,
 384         },
 385
 386         { .ctl_name = 0 }
 387 };
 388
 389 #define NET_NF_CONNTRACK_MAX 2089
 390
 391 static ctl_table nf_ct_netfilter_table[] = {
 392         {
 393                 .ctl_name       = NET_NETFILTER,
 394                 .procname       = "netfilter",
 395                 .mode           = 0555,
 396                 .child          = nf_ct_sysctl_table,
 397         },
 398         {
 399                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 400                 .procname       = "nf_conntrack_max",
 401                 .data           = &nf_conntrack_max,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dointvec,
 405         },
 406         { .ctl_name = 0 }
 407 };
 408
 409 static ctl_table nf_ct_net_table[] = {
 410         {
 411                 .ctl_name       = CTL_NET,
 412                 .procname       = "net",
 413                 .mode           = 0555,
 414                 .child          = nf_ct_netfilter_table,
 415         },
 416         { .ctl_name = 0 }
 417 };
 418 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 419 #endif /* CONFIG_SYSCTL */
 420
 421 static int __init nf_conntrack_standalone_init(void)
 422 {
 423 #ifdef CONFIG_PROC_FS
 424         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 425 #endif
 426         int ret = 0;
 427
 428         ret = nf_conntrack_init();
 429         if (ret < 0)
 430                 return ret;
 431
 432 #ifdef CONFIG_PROC_FS
 433         proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
 434         if (!proc) goto cleanup_init;
 435
 436         proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
 437                                         &exp_file_ops);
 438         if (!proc_exp) goto cleanup_proc;
 439
 440         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
 441         if (!proc_stat)
 442                 goto cleanup_proc_exp;
 443
 444         proc_stat->proc_fops = &ct_cpu_seq_fops;
 445         proc_stat->owner = THIS_MODULE;
 446 #endif
 447 #ifdef CONFIG_SYSCTL
 448         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
 449         if (nf_ct_sysctl_header == NULL) {
 450                 printk("nf_conntrack: can't register to sysctl.\n");
 451                 ret = -ENOMEM;
 452                 goto cleanup_proc_stat;
 453         }
 454 #endif
 455         return ret;
 456
 457 #ifdef CONFIG_SYSCTL
 458  cleanup_proc_stat:
 459 #endif
 460 #ifdef CONFIG_PROC_FS
 461         remove_proc_entry("nf_conntrack", proc_net_stat);
 462  cleanup_proc_exp:
 463         proc_net_remove("nf_conntrack_expect");
 464  cleanup_proc:
 465         proc_net_remove("nf_conntrack");
 466  cleanup_init:
 467 #endif /* CNFIG_PROC_FS */
 468         nf_conntrack_cleanup();
 469         return ret;
 470 }
 471
 472 static void __exit nf_conntrack_standalone_fini(void)
 473 {
 474 #ifdef CONFIG_SYSCTL
 475         unregister_sysctl_table(nf_ct_sysctl_header);
 476 #endif
 477 #ifdef CONFIG_PROC_FS
 478         remove_proc_entry("nf_conntrack", proc_net_stat);
 479         proc_net_remove("nf_conntrack_expect");
 480         proc_net_remove("nf_conntrack");
 481 #endif /* CNFIG_PROC_FS */
 482         nf_conntrack_cleanup();
 483 }
 484
 485 module_init(nf_conntrack_standalone_init);
 486 module_exit(nf_conntrack_standalone_fini);
 487
 488 /* Some modules need us, but don't depend directly on any symbol.
 489    They should call this. */
 490 void need_conntrack(void)
 491 {
 492 }
 493 EXPORT_SYMBOL_GPL(need_conntrack);