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 #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             struct nf_conntrack_l3proto *l3proto,
  35             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
  62         for (st->bucket = 0;
  63              st->bucket < nf_conntrack_htable_size;
  64              st->bucket++) {
  65                 if (!hlist_empty(&nf_conntrack_hash[st->bucket]))
  66                         return nf_conntrack_hash[st->bucket].first;
  67         }
  68         return NULL;
  69 }
  70
  71 static struct hlist_node *ct_get_next(struct seq_file *seq,
  72                                       struct hlist_node *head)
  73 {
  74         struct ct_iter_state *st = seq->private;
  75
  76         head = head->next;
  77         while (head == NULL) {
  78                 if (++st->bucket >= nf_conntrack_htable_size)
  79                         return NULL;
  80                 head = nf_conntrack_hash[st->bucket].first;
  81         }
  82         return head;
  83 }
  84
  85 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  86 {
  87         struct hlist_node *head = ct_get_first(seq);
  88
  89         if (head)
  90                 while (pos && (head = ct_get_next(seq, head)))
  91                         pos--;
  92         return pos ? NULL : head;
  93 }
  94
  95 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  96 {
  97         read_lock_bh(&nf_conntrack_lock);
  98         return ct_get_idx(seq, *pos);
  99 }
 100
 101 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 102 {
 103         (*pos)++;
 104         return ct_get_next(s, v);
 105 }
 106
 107 static void ct_seq_stop(struct seq_file *s, void *v)
 108 {
 109         read_unlock_bh(&nf_conntrack_lock);
 110 }
 111
 112 /* return 0 on success, 1 in case of error */
 113 static int ct_seq_show(struct seq_file *s, void *v)
 114 {
 115         const struct nf_conntrack_tuple_hash *hash = v;
 116         const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
 117         struct nf_conntrack_l3proto *l3proto;
 118         struct nf_conntrack_l4proto *l4proto;
 119
 120         NF_CT_ASSERT(conntrack);
 121
 122         /* we only want to print DIR_ORIGINAL */
 123         if (NF_CT_DIRECTION(hash))
 124                 return 0;
 125
 126         l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 127                                        .tuple.src.l3num);
 128
 129         NF_CT_ASSERT(l3proto);
 130         l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 131                                    .tuple.src.l3num,
 132                                    conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
 133                                    .tuple.dst.protonum);
 134         NF_CT_ASSERT(l4proto);
 135
 136         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 137                        l3proto->name,
 138                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
 139                        l4proto->name,
 140                        conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 141                        timer_pending(&conntrack->timeout)
 142                        ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 143                 return -ENOSPC;
 144
 145         if (l3proto->print_conntrack(s, conntrack))
 146                 return -ENOSPC;
 147
 148         if (l4proto->print_conntrack(s, conntrack))
 149                 return -ENOSPC;
 150
 151         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 152                         l3proto, l4proto))
 153                 return -ENOSPC;
 154
 155         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
 156                 return -ENOSPC;
 157
 158         if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
 159                 if (seq_printf(s, "[UNREPLIED] "))
 160                         return -ENOSPC;
 161
 162         if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
 163                         l3proto, l4proto))
 164                 return -ENOSPC;
 165
 166         if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
 167                 return -ENOSPC;
 168
 169         if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
 170                 if (seq_printf(s, "[ASSURED] "))
 171                         return -ENOSPC;
 172
 173 #if defined(CONFIG_NF_CONNTRACK_MARK)
 174         if (seq_printf(s, "mark=%u ", conntrack->mark))
 175                 return -ENOSPC;
 176 #endif
 177
 178 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 179         if (seq_printf(s, "secmark=%u ", conntrack->secmark))
 180                 return -ENOSPC;
 181 #endif
 182
 183         if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
 184                 return -ENOSPC;
 185
 186         return 0;
 187 }
 188
 189 static const struct seq_operations ct_seq_ops = {
 190         .start = ct_seq_start,
 191         .next  = ct_seq_next,
 192         .stop  = ct_seq_stop,
 193         .show  = ct_seq_show
 194 };
 195
 196 static int ct_open(struct inode *inode, struct file *file)
 197 {
 198         struct seq_file *seq;
 199         struct ct_iter_state *st;
 200         int ret;
 201
 202         st = kzalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 203         if (st == NULL)
 204                 return -ENOMEM;
 205         ret = seq_open(file, &ct_seq_ops);
 206         if (ret)
 207                 goto out_free;
 208         seq          = file->private_data;
 209         seq->private = st;
 210         return ret;
 211 out_free:
 212         kfree(st);
 213         return ret;
 214 }
 215
 216 static const struct file_operations ct_file_ops = {
 217         .owner   = THIS_MODULE,
 218         .open    = ct_open,
 219         .read    = seq_read,
 220         .llseek  = seq_lseek,
 221         .release = seq_release_private,
 222 };
 223
 224 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 225 {
 226         int cpu;
 227
 228         if (*pos == 0)
 229                 return SEQ_START_TOKEN;
 230
 231         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 232                 if (!cpu_possible(cpu))
 233                         continue;
 234                 *pos = cpu + 1;
 235                 return &per_cpu(nf_conntrack_stat, cpu);
 236         }
 237
 238         return NULL;
 239 }
 240
 241 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 242 {
 243         int cpu;
 244
 245         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 246                 if (!cpu_possible(cpu))
 247                         continue;
 248                 *pos = cpu + 1;
 249                 return &per_cpu(nf_conntrack_stat, cpu);
 250         }
 251
 252         return NULL;
 253 }
 254
 255 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 256 {
 257 }
 258
 259 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 260 {
 261         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 262         struct ip_conntrack_stat *st = v;
 263
 264         if (v == SEQ_START_TOKEN) {
 265                 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");
 266                 return 0;
 267         }
 268
 269         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 270                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 271                    nr_conntracks,
 272                    st->searched,
 273                    st->found,
 274                    st->new,
 275                    st->invalid,
 276                    st->ignore,
 277                    st->delete,
 278                    st->delete_list,
 279                    st->insert,
 280                    st->insert_failed,
 281                    st->drop,
 282                    st->early_drop,
 283                    st->error,
 284
 285                    st->expect_new,
 286                    st->expect_create,
 287                    st->expect_delete
 288                 );
 289         return 0;
 290 }
 291
 292 static const struct seq_operations ct_cpu_seq_ops = {
 293         .start  = ct_cpu_seq_start,
 294         .next   = ct_cpu_seq_next,
 295         .stop   = ct_cpu_seq_stop,
 296         .show   = ct_cpu_seq_show,
 297 };
 298
 299 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 300 {
 301         return seq_open(file, &ct_cpu_seq_ops);
 302 }
 303
 304 static const struct file_operations ct_cpu_seq_fops = {
 305         .owner   = THIS_MODULE,
 306         .open    = ct_cpu_seq_open,
 307         .read    = seq_read,
 308         .llseek  = seq_lseek,
 309         .release = seq_release_private,
 310 };
 311 #endif /* CONFIG_PROC_FS */
 312
 313 /* Sysctl support */
 314
 315 int nf_conntrack_checksum __read_mostly = 1;
 316 EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
 317
 318 #ifdef CONFIG_SYSCTL
 319 /* Log invalid packets of a given protocol */
 320 static int log_invalid_proto_min = 0;
 321 static int log_invalid_proto_max = 255;
 322
 323 static struct ctl_table_header *nf_ct_sysctl_header;
 324
 325 static ctl_table nf_ct_sysctl_table[] = {
 326         {
 327                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 328                 .procname       = "nf_conntrack_max",
 329                 .data           = &nf_conntrack_max,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec,
 333         },
 334         {
 335                 .ctl_name       = NET_NF_CONNTRACK_COUNT,
 336                 .procname       = "nf_conntrack_count",
 337                 .data           = &nf_conntrack_count,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0444,
 340                 .proc_handler   = &proc_dointvec,
 341         },
 342         {
 343                 .ctl_name       = NET_NF_CONNTRACK_BUCKETS,
 344                 .procname       = "nf_conntrack_buckets",
 345                 .data           = &nf_conntrack_htable_size,
 346                 .maxlen         = sizeof(unsigned int),
 347                 .mode           = 0444,
 348                 .proc_handler   = &proc_dointvec,
 349         },
 350         {
 351                 .ctl_name       = NET_NF_CONNTRACK_CHECKSUM,
 352                 .procname       = "nf_conntrack_checksum",
 353                 .data           = &nf_conntrack_checksum,
 354                 .maxlen         = sizeof(unsigned int),
 355                 .mode           = 0644,
 356                 .proc_handler   = &proc_dointvec,
 357         },
 358         {
 359                 .ctl_name       = NET_NF_CONNTRACK_LOG_INVALID,
 360                 .procname       = "nf_conntrack_log_invalid",
 361                 .data           = &nf_ct_log_invalid,
 362                 .maxlen         = sizeof(unsigned int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec_minmax,
 365                 .strategy       = &sysctl_intvec,
 366                 .extra1         = &log_invalid_proto_min,
 367                 .extra2         = &log_invalid_proto_max,
 368         },
 369         {
 370                 .ctl_name       = CTL_UNNUMBERED,
 371                 .procname       = "nf_conntrack_expect_max",
 372                 .data           = &nf_ct_expect_max,
 373                 .maxlen         = sizeof(int),
 374                 .mode           = 0644,
 375                 .proc_handler   = &proc_dointvec,
 376         },
 377         { .ctl_name = 0 }
 378 };
 379
 380 #define NET_NF_CONNTRACK_MAX 2089
 381
 382 static ctl_table nf_ct_netfilter_table[] = {
 383         {
 384                 .ctl_name       = NET_NETFILTER,
 385                 .procname       = "netfilter",
 386                 .mode           = 0555,
 387                 .child          = nf_ct_sysctl_table,
 388         },
 389         {
 390                 .ctl_name       = NET_NF_CONNTRACK_MAX,
 391                 .procname       = "nf_conntrack_max",
 392                 .data           = &nf_conntrack_max,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec,
 396         },
 397         { .ctl_name = 0 }
 398 };
 399
 400 static ctl_table nf_ct_net_table[] = {
 401         {
 402                 .ctl_name       = CTL_NET,
 403                 .procname       = "net",
 404                 .mode           = 0555,
 405                 .child          = nf_ct_netfilter_table,
 406         },
 407         { .ctl_name = 0 }
 408 };
 409 EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
 410 #endif /* CONFIG_SYSCTL */
 411
 412 static int __init nf_conntrack_standalone_init(void)
 413 {
 414 #ifdef CONFIG_PROC_FS
 415         struct proc_dir_entry *proc, *proc_stat;
 416 #endif
 417         int ret = 0;
 418
 419         ret = nf_conntrack_init();
 420         if (ret < 0)
 421                 return ret;
 422
 423 #ifdef CONFIG_PROC_FS
 424         proc = proc_net_fops_create(&init_net, "nf_conntrack", 0440, &ct_file_ops);
 425         if (!proc) goto cleanup_init;
 426
 427         proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, init_net.proc_net_stat);
 428         if (!proc_stat)
 429                 goto cleanup_proc;
 430
 431         proc_stat->proc_fops = &ct_cpu_seq_fops;
 432         proc_stat->owner = THIS_MODULE;
 433 #endif
 434 #ifdef CONFIG_SYSCTL
 435         nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table);
 436         if (nf_ct_sysctl_header == NULL) {
 437                 printk("nf_conntrack: can't register to sysctl.\n");
 438                 ret = -ENOMEM;
 439                 goto cleanup_proc_stat;
 440         }
 441 #endif
 442         return ret;
 443
 444 #ifdef CONFIG_SYSCTL
 445  cleanup_proc_stat:
 446 #endif
 447 #ifdef CONFIG_PROC_FS
 448         remove_proc_entry("nf_conntrack", init_net. proc_net_stat);
 449  cleanup_proc:
 450         proc_net_remove(&init_net, "nf_conntrack");
 451  cleanup_init:
 452 #endif /* CNFIG_PROC_FS */
 453         nf_conntrack_cleanup();
 454         return ret;
 455 }
 456
 457 static void __exit nf_conntrack_standalone_fini(void)
 458 {
 459 #ifdef CONFIG_SYSCTL
 460         unregister_sysctl_table(nf_ct_sysctl_header);
 461 #endif
 462 #ifdef CONFIG_PROC_FS
 463         remove_proc_entry("nf_conntrack", init_net.proc_net_stat);
 464         proc_net_remove(&init_net, "nf_conntrack");
 465 #endif /* CNFIG_PROC_FS */
 466         nf_conntrack_cleanup();
 467 }
 468
 469 module_init(nf_conntrack_standalone_init);
 470 module_exit(nf_conntrack_standalone_fini);
 471
 472 /* Some modules need us, but don't depend directly on any symbol.
 473    They should call this. */
 474 void need_conntrack(void)
 475 {
 476 }
 477 EXPORT_SYMBOL_GPL(need_conntrack);