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