Pileus Git - ~andy/linux/blob - 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/slab.h>
  12 #include <linux/module.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/percpu.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/security.h>
  19 #include <net/net_namespace.h>
  20 #ifdef CONFIG_SYSCTL
  21 #include <linux/sysctl.h>
  22 #endif
  23
  24 #include <net/netfilter/nf_conntrack.h>
  25 #include <net/netfilter/nf_conntrack_core.h>
  26 #include <net/netfilter/nf_conntrack_l3proto.h>
  27 #include <net/netfilter/nf_conntrack_l4proto.h>
  28 #include <net/netfilter/nf_conntrack_expect.h>
  29 #include <net/netfilter/nf_conntrack_helper.h>
  30 #include <net/netfilter/nf_conntrack_acct.h>
  31 #include <net/netfilter/nf_conntrack_zones.h>
  32 #include <linux/rculist_nulls.h>
  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             const struct nf_conntrack_l3proto *l3proto,
  40             const 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 struct ct_iter_state {
  47         struct seq_net_private p;
  48         unsigned int bucket;
  49 };
  50
  51 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
  52 {
  53         struct net *net = seq_file_net(seq);
  54         struct ct_iter_state *st = seq->private;
  55         struct hlist_nulls_node *n;
  56
  57         for (st->bucket = 0;
  58              st->bucket < net->ct.htable_size;
  59              st->bucket++) {
  60                 n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
  61                 if (!is_a_nulls(n))
  62                         return n;
  63         }
  64         return NULL;
  65 }
  66
  67 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
  68                                       struct hlist_nulls_node *head)
  69 {
  70         struct net *net = seq_file_net(seq);
  71         struct ct_iter_state *st = seq->private;
  72
  73         head = rcu_dereference(hlist_nulls_next_rcu(head));
  74         while (is_a_nulls(head)) {
  75                 if (likely(get_nulls_value(head) == st->bucket)) {
  76                         if (++st->bucket >= net->ct.htable_size)
  77                                 return NULL;
  78                 }
  79                 head = rcu_dereference(
  80                                 hlist_nulls_first_rcu(
  81                                         &net->ct.hash[st->bucket]));
  82         }
  83         return head;
  84 }
  85
  86 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  87 {
  88         struct hlist_nulls_node *head = ct_get_first(seq);
  89
  90         if (head)
  91                 while (pos && (head = ct_get_next(seq, head)))
  92                         pos--;
  93         return pos ? NULL : head;
  94 }
  95
  96 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  97         __acquires(RCU)
  98 {
  99         rcu_read_lock();
 100         return ct_get_idx(seq, *pos);
 101 }
 102
 103 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
 104 {
 105         (*pos)++;
 106         return ct_get_next(s, v);
 107 }
 108
 109 static void ct_seq_stop(struct seq_file *s, void *v)
 110         __releases(RCU)
 111 {
 112         rcu_read_unlock();
 113 }
 114
 115 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 116 static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 117 {
 118         int ret;
 119         u32 len;
 120         char *secctx;
 121
 122         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 123         if (ret)
 124                 return ret;
 125
 126         ret = seq_printf(s, "secctx=%s ", secctx);
 127
 128         security_release_secctx(secctx, len);
 129         return ret;
 130 }
 131 #else
 132 static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 133 {
 134         return 0;
 135 }
 136 #endif
 137
 138 /* return 0 on success, 1 in case of error */
 139 static int ct_seq_show(struct seq_file *s, void *v)
 140 {
 141         struct nf_conntrack_tuple_hash *hash = v;
 142         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 143         const struct nf_conntrack_l3proto *l3proto;
 144         const struct nf_conntrack_l4proto *l4proto;
 145         int ret = 0;
 146
 147         NF_CT_ASSERT(ct);
 148         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 149                 return 0;
 150
 151         /* we only want to print DIR_ORIGINAL */
 152         if (NF_CT_DIRECTION(hash))
 153                 goto release;
 154
 155         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 156         NF_CT_ASSERT(l3proto);
 157         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 158         NF_CT_ASSERT(l4proto);
 159
 160         ret = -ENOSPC;
 161         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
 162                        l3proto->name, nf_ct_l3num(ct),
 163                        l4proto->name, nf_ct_protonum(ct),
 164                        timer_pending(&ct->timeout)
 165                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 166                 goto release;
 167
 168         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 169                 goto release;
 170
 171         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 172                         l3proto, l4proto))
 173                 goto release;
 174
 175         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 176                 goto release;
 177
 178         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 179                 if (seq_printf(s, "[UNREPLIED] "))
 180                         goto release;
 181
 182         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 183                         l3proto, l4proto))
 184                 goto release;
 185
 186         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 187                 goto release;
 188
 189         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 190                 if (seq_printf(s, "[ASSURED] "))
 191                         goto release;
 192
 193 #if defined(CONFIG_NF_CONNTRACK_MARK)
 194         if (seq_printf(s, "mark=%u ", ct->mark))
 195                 goto release;
 196 #endif
 197
 198         if (ct_show_secctx(s, ct))
 199                 goto release;
 200
 201 #ifdef CONFIG_NF_CONNTRACK_ZONES
 202         if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
 203                 goto release;
 204 #endif
 205
 206         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 207                 goto release;
 208
 209         ret = 0;
 210 release:
 211         nf_ct_put(ct);
 212         return 0;
 213 }
 214
 215 static const struct seq_operations ct_seq_ops = {
 216         .start = ct_seq_start,
 217         .next  = ct_seq_next,
 218         .stop  = ct_seq_stop,
 219         .show  = ct_seq_show
 220 };
 221
 222 static int ct_open(struct inode *inode, struct file *file)
 223 {
 224         return seq_open_net(inode, file, &ct_seq_ops,
 225                         sizeof(struct ct_iter_state));
 226 }
 227
 228 static const struct file_operations ct_file_ops = {
 229         .owner   = THIS_MODULE,
 230         .open    = ct_open,
 231         .read    = seq_read,
 232         .llseek  = seq_lseek,
 233         .release = seq_release_net,
 234 };
 235
 236 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 237 {
 238         struct net *net = seq_file_net(seq);
 239         int cpu;
 240
 241         if (*pos == 0)
 242                 return SEQ_START_TOKEN;
 243
 244         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 245                 if (!cpu_possible(cpu))
 246                         continue;
 247                 *pos = cpu + 1;
 248                 return per_cpu_ptr(net->ct.stat, cpu);
 249         }
 250
 251         return NULL;
 252 }
 253
 254 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 255 {
 256         struct net *net = seq_file_net(seq);
 257         int cpu;
 258
 259         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 260                 if (!cpu_possible(cpu))
 261                         continue;
 262                 *pos = cpu + 1;
 263                 return per_cpu_ptr(net->ct.stat, cpu);
 264         }
 265
 266         return NULL;
 267 }
 268
 269 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 270 {
 271 }
 272
 273 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 274 {
 275         struct net *net = seq_file_net(seq);
 276         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 277         const struct ip_conntrack_stat *st = v;
 278
 279         if (v == SEQ_START_TOKEN) {
 280                 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 search_restart\n");
 281                 return 0;
 282         }
 283
 284         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 285                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 286                    nr_conntracks,
 287                    st->searched,
 288                    st->found,
 289                    st->new,
 290                    st->invalid,
 291                    st->ignore,
 292                    st->delete,
 293                    st->delete_list,
 294                    st->insert,
 295                    st->insert_failed,
 296                    st->drop,
 297                    st->early_drop,
 298                    st->error,
 299
 300                    st->expect_new,
 301                    st->expect_create,
 302                    st->expect_delete,
 303                    st->search_restart
 304                 );
 305         return 0;
 306 }
 307
 308 static const 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_net(inode, file, &ct_cpu_seq_ops,
 318                             sizeof(struct seq_net_private));
 319 }
 320
 321 static const struct file_operations ct_cpu_seq_fops = {
 322         .owner   = THIS_MODULE,
 323         .open    = ct_cpu_seq_open,
 324         .read    = seq_read,
 325         .llseek  = seq_lseek,
 326         .release = seq_release_net,
 327 };
 328
 329 static int nf_conntrack_standalone_init_proc(struct net *net)
 330 {
 331         struct proc_dir_entry *pde;
 332
 333         pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
 334         if (!pde)
 335                 goto out_nf_conntrack;
 336
 337         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
 338                           &ct_cpu_seq_fops);
 339         if (!pde)
 340                 goto out_stat_nf_conntrack;
 341         return 0;
 342
 343 out_stat_nf_conntrack:
 344         proc_net_remove(net, "nf_conntrack");
 345 out_nf_conntrack:
 346         return -ENOMEM;
 347 }
 348
 349 static void nf_conntrack_standalone_fini_proc(struct net *net)
 350 {
 351         remove_proc_entry("nf_conntrack", net->proc_net_stat);
 352         proc_net_remove(net, "nf_conntrack");
 353 }
 354 #else
 355 static int nf_conntrack_standalone_init_proc(struct net *net)
 356 {
 357         return 0;
 358 }
 359
 360 static void nf_conntrack_standalone_fini_proc(struct net *net)
 361 {
 362 }
 363 #endif /* CONFIG_PROC_FS */
 364
 365 /* Sysctl support */
 366
 367 #ifdef CONFIG_SYSCTL
 368 /* Log invalid packets of a given protocol */
 369 static int log_invalid_proto_min = 0;
 370 static int log_invalid_proto_max = 255;
 371
 372 static struct ctl_table_header *nf_ct_netfilter_header;
 373
 374 static ctl_table nf_ct_sysctl_table[] = {
 375         {
 376                 .procname       = "nf_conntrack_max",
 377                 .data           = &nf_conntrack_max,
 378                 .maxlen         = sizeof(int),
 379                 .mode           = 0644,
 380                 .proc_handler   = proc_dointvec,
 381         },
 382         {
 383                 .procname       = "nf_conntrack_count",
 384                 .data           = &init_net.ct.count,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0444,
 387                 .proc_handler   = proc_dointvec,
 388         },
 389         {
 390                 .procname       = "nf_conntrack_buckets",
 391                 .data           = &init_net.ct.htable_size,
 392                 .maxlen         = sizeof(unsigned int),
 393                 .mode           = 0444,
 394                 .proc_handler   = proc_dointvec,
 395         },
 396         {
 397                 .procname       = "nf_conntrack_checksum",
 398                 .data           = &init_net.ct.sysctl_checksum,
 399                 .maxlen         = sizeof(unsigned int),
 400                 .mode           = 0644,
 401                 .proc_handler   = proc_dointvec,
 402         },
 403         {
 404                 .procname       = "nf_conntrack_log_invalid",
 405                 .data           = &init_net.ct.sysctl_log_invalid,
 406                 .maxlen         = sizeof(unsigned int),
 407                 .mode           = 0644,
 408                 .proc_handler   = proc_dointvec_minmax,
 409                 .extra1         = &log_invalid_proto_min,
 410                 .extra2         = &log_invalid_proto_max,
 411         },
 412         {
 413                 .procname       = "nf_conntrack_expect_max",
 414                 .data           = &nf_ct_expect_max,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = proc_dointvec,
 418         },
 419         { }
 420 };
 421
 422 #define NET_NF_CONNTRACK_MAX 2089
 423
 424 static ctl_table nf_ct_netfilter_table[] = {
 425         {
 426                 .procname       = "nf_conntrack_max",
 427                 .data           = &nf_conntrack_max,
 428                 .maxlen         = sizeof(int),
 429                 .mode           = 0644,
 430                 .proc_handler   = proc_dointvec,
 431         },
 432         { }
 433 };
 434
 435 static struct ctl_path nf_ct_path[] = {
 436         { .procname = "net", },
 437         { }
 438 };
 439
 440 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 441 {
 442         struct ctl_table *table;
 443
 444         if (net_eq(net, &init_net)) {
 445                 nf_ct_netfilter_header =
 446                        register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
 447                 if (!nf_ct_netfilter_header)
 448                         goto out;
 449         }
 450
 451         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
 452                         GFP_KERNEL);
 453         if (!table)
 454                 goto out_kmemdup;
 455
 456         table[1].data = &net->ct.count;
 457         table[2].data = &net->ct.htable_size;
 458         table[3].data = &net->ct.sysctl_checksum;
 459         table[4].data = &net->ct.sysctl_log_invalid;
 460
 461         net->ct.sysctl_header = register_net_sysctl_table(net,
 462                                         nf_net_netfilter_sysctl_path, table);
 463         if (!net->ct.sysctl_header)
 464                 goto out_unregister_netfilter;
 465
 466         return 0;
 467
 468 out_unregister_netfilter:
 469         kfree(table);
 470 out_kmemdup:
 471         if (net_eq(net, &init_net))
 472                 unregister_sysctl_table(nf_ct_netfilter_header);
 473 out:
 474         printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n");
 475         return -ENOMEM;
 476 }
 477
 478 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 479 {
 480         struct ctl_table *table;
 481
 482         if (net_eq(net, &init_net))
 483                 unregister_sysctl_table(nf_ct_netfilter_header);
 484         table = net->ct.sysctl_header->ctl_table_arg;
 485         unregister_net_sysctl_table(net->ct.sysctl_header);
 486         kfree(table);
 487 }
 488 #else
 489 static int nf_conntrack_standalone_init_sysctl(struct net *net)
 490 {
 491         return 0;
 492 }
 493
 494 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
 495 {
 496 }
 497 #endif /* CONFIG_SYSCTL */
 498
 499 static int nf_conntrack_net_init(struct net *net)
 500 {
 501         int ret;
 502
 503         ret = nf_conntrack_init(net);
 504         if (ret < 0)
 505                 goto out_init;
 506         ret = nf_conntrack_standalone_init_proc(net);
 507         if (ret < 0)
 508                 goto out_proc;
 509         net->ct.sysctl_checksum = 1;
 510         net->ct.sysctl_log_invalid = 0;
 511         ret = nf_conntrack_standalone_init_sysctl(net);
 512         if (ret < 0)
 513                 goto out_sysctl;
 514         return 0;
 515
 516 out_sysctl:
 517         nf_conntrack_standalone_fini_proc(net);
 518 out_proc:
 519         nf_conntrack_cleanup(net);
 520 out_init:
 521         return ret;
 522 }
 523
 524 static void nf_conntrack_net_exit(struct net *net)
 525 {
 526         nf_conntrack_standalone_fini_sysctl(net);
 527         nf_conntrack_standalone_fini_proc(net);
 528         nf_conntrack_cleanup(net);
 529 }
 530
 531 static struct pernet_operations nf_conntrack_net_ops = {
 532         .init = nf_conntrack_net_init,
 533         .exit = nf_conntrack_net_exit,
 534 };
 535
 536 static int __init nf_conntrack_standalone_init(void)
 537 {
 538         return register_pernet_subsys(&nf_conntrack_net_ops);
 539 }
 540
 541 static void __exit nf_conntrack_standalone_fini(void)
 542 {
 543         unregister_pernet_subsys(&nf_conntrack_net_ops);
 544 }
 545
 546 module_init(nf_conntrack_standalone_init);
 547 module_exit(nf_conntrack_standalone_fini);
 548
 549 /* Some modules need us, but don't depend directly on any symbol.
 550    They should call this. */
 551 void need_conntrack(void)
 552 {
 553 }
 554 EXPORT_SYMBOL_GPL(need_conntrack);