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