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