net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c

   1 /* ip_conntrack proc compat - based on ip_conntrack_standalone.c
   2  *
   3  * (C) 1999-2001 Paul `Rusty' Russell
   4  * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
   5  * (C) 2006-2010 Patrick McHardy <kaber@trash.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/types.h>
  12 #include <linux/proc_fs.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/percpu.h>
  15 #include <linux/security.h>
  16 #include <net/net_namespace.h>
  17
  18 #include <linux/netfilter.h>
  19 #include <net/netfilter/nf_conntrack_core.h>
  20 #include <net/netfilter/nf_conntrack_l3proto.h>
  21 #include <net/netfilter/nf_conntrack_l4proto.h>
  22 #include <net/netfilter/nf_conntrack_expect.h>
  23 #include <net/netfilter/nf_conntrack_acct.h>
  24 #include <linux/rculist_nulls.h>
  25 #include <linux/export.h>
  26
  27 struct ct_iter_state {
  28         struct seq_net_private p;
  29         unsigned int bucket;
  30 };
  31
  32 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
  33 {
  34         struct net *net = seq_file_net(seq);
  35         struct ct_iter_state *st = seq->private;
  36         struct hlist_nulls_node *n;
  37
  38         for (st->bucket = 0;
  39              st->bucket < net->ct.htable_size;
  40              st->bucket++) {
  41                 n = rcu_dereference(
  42                         hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
  43                 if (!is_a_nulls(n))
  44                         return n;
  45         }
  46         return NULL;
  47 }
  48
  49 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
  50                                       struct hlist_nulls_node *head)
  51 {
  52         struct net *net = seq_file_net(seq);
  53         struct ct_iter_state *st = seq->private;
  54
  55         head = rcu_dereference(hlist_nulls_next_rcu(head));
  56         while (is_a_nulls(head)) {
  57                 if (likely(get_nulls_value(head) == st->bucket)) {
  58                         if (++st->bucket >= net->ct.htable_size)
  59                                 return NULL;
  60                 }
  61                 head = rcu_dereference(
  62                         hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
  63         }
  64         return head;
  65 }
  66
  67 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  68 {
  69         struct hlist_nulls_node *head = ct_get_first(seq);
  70
  71         if (head)
  72                 while (pos && (head = ct_get_next(seq, head)))
  73                         pos--;
  74         return pos ? NULL : head;
  75 }
  76
  77 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  78         __acquires(RCU)
  79 {
  80         rcu_read_lock();
  81         return ct_get_idx(seq, *pos);
  82 }
  83
  84 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  85 {
  86         (*pos)++;
  87         return ct_get_next(s, v);
  88 }
  89
  90 static void ct_seq_stop(struct seq_file *s, void *v)
  91         __releases(RCU)
  92 {
  93         rcu_read_unlock();
  94 }
  95
  96 #ifdef CONFIG_NF_CONNTRACK_SECMARK
  97 static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
  98 {
  99         int ret;
 100         u32 len;
 101         char *secctx;
 102
 103         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 104         if (ret)
 105                 return;
 106
 107         seq_printf(s, "secctx=%s ", secctx);
 108
 109         security_release_secctx(secctx, len);
 110 }
 111 #else
 112 static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 113 {
 114 }
 115 #endif
 116
 117 static int ct_seq_show(struct seq_file *s, void *v)
 118 {
 119         struct nf_conntrack_tuple_hash *hash = v;
 120         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 121         const struct nf_conntrack_l3proto *l3proto;
 122         const struct nf_conntrack_l4proto *l4proto;
 123         int ret = 0;
 124
 125         NF_CT_ASSERT(ct);
 126         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 127                 return 0;
 128
 129
 130         /* we only want to print DIR_ORIGINAL */
 131         if (NF_CT_DIRECTION(hash))
 132                 goto release;
 133         if (nf_ct_l3num(ct) != AF_INET)
 134                 goto release;
 135
 136         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 137         NF_CT_ASSERT(l3proto);
 138         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 139         NF_CT_ASSERT(l4proto);
 140
 141         ret = -ENOSPC;
 142         seq_printf(s, "%-8s %u %ld ",
 143                    l4proto->name, nf_ct_protonum(ct),
 144                    timer_pending(&ct->timeout)
 145                    ? (long)(ct->timeout.expires - jiffies)/HZ : 0);
 146
 147         if (l4proto->print_conntrack)
 148                 l4proto->print_conntrack(s, ct);
 149
 150         if (seq_has_overflowed(s))
 151                 goto release;
 152
 153         print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 154                     l3proto, l4proto);
 155
 156         if (seq_has_overflowed(s))
 157                 goto release;
 158
 159         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 160                 goto release;
 161
 162         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 163                 seq_printf(s, "[UNREPLIED] ");
 164
 165         print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 166                     l3proto, l4proto);
 167
 168         if (seq_has_overflowed(s))
 169                 goto release;
 170
 171         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 172                 goto release;
 173
 174         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 175                 seq_printf(s, "[ASSURED] ");
 176
 177 #ifdef CONFIG_NF_CONNTRACK_MARK
 178         seq_printf(s, "mark=%u ", ct->mark);
 179 #endif
 180
 181         ct_show_secctx(s, ct);
 182
 183         seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
 184
 185         if (seq_has_overflowed(s))
 186                 goto release;
 187
 188         ret = 0;
 189 release:
 190         nf_ct_put(ct);
 191         return ret;
 192 }
 193
 194 static const 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         return seq_open_net(inode, file, &ct_seq_ops,
 204                             sizeof(struct ct_iter_state));
 205 }
 206
 207 static const struct file_operations ct_file_ops = {
 208         .owner   = THIS_MODULE,
 209         .open    = ct_open,
 210         .read    = seq_read,
 211         .llseek  = seq_lseek,
 212         .release = seq_release_net,
 213 };
 214
 215 /* expects */
 216 struct ct_expect_iter_state {
 217         struct seq_net_private p;
 218         unsigned int bucket;
 219 };
 220
 221 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 222 {
 223         struct net *net = seq_file_net(seq);
 224         struct ct_expect_iter_state *st = seq->private;
 225         struct hlist_node *n;
 226
 227         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 228                 n = rcu_dereference(
 229                         hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
 230                 if (n)
 231                         return n;
 232         }
 233         return NULL;
 234 }
 235
 236 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 237                                              struct hlist_node *head)
 238 {
 239         struct net *net = seq_file_net(seq);
 240         struct ct_expect_iter_state *st = seq->private;
 241
 242         head = rcu_dereference(hlist_next_rcu(head));
 243         while (head == NULL) {
 244                 if (++st->bucket >= nf_ct_expect_hsize)
 245                         return NULL;
 246                 head = rcu_dereference(
 247                         hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
 248         }
 249         return head;
 250 }
 251
 252 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 253 {
 254         struct hlist_node *head = ct_expect_get_first(seq);
 255
 256         if (head)
 257                 while (pos && (head = ct_expect_get_next(seq, head)))
 258                         pos--;
 259         return pos ? NULL : head;
 260 }
 261
 262 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 263         __acquires(RCU)
 264 {
 265         rcu_read_lock();
 266         return ct_expect_get_idx(seq, *pos);
 267 }
 268
 269 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 270 {
 271         (*pos)++;
 272         return ct_expect_get_next(seq, v);
 273 }
 274
 275 static void exp_seq_stop(struct seq_file *seq, void *v)
 276         __releases(RCU)
 277 {
 278         rcu_read_unlock();
 279 }
 280
 281 static int exp_seq_show(struct seq_file *s, void *v)
 282 {
 283         struct nf_conntrack_expect *exp;
 284         const struct hlist_node *n = v;
 285
 286         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 287
 288         if (exp->tuple.src.l3num != AF_INET)
 289                 return 0;
 290
 291         if (exp->timeout.function)
 292                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 293                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 294         else
 295                 seq_printf(s, "- ");
 296
 297         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 298
 299         print_tuple(s, &exp->tuple,
 300                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 301                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 302                                          exp->tuple.dst.protonum));
 303         return seq_putc(s, '\n');
 304 }
 305
 306 static const struct seq_operations exp_seq_ops = {
 307         .start = exp_seq_start,
 308         .next = exp_seq_next,
 309         .stop = exp_seq_stop,
 310         .show = exp_seq_show
 311 };
 312
 313 static int exp_open(struct inode *inode, struct file *file)
 314 {
 315         return seq_open_net(inode, file, &exp_seq_ops,
 316                             sizeof(struct ct_expect_iter_state));
 317 }
 318
 319 static const struct file_operations ip_exp_file_ops = {
 320         .owner   = THIS_MODULE,
 321         .open    = exp_open,
 322         .read    = seq_read,
 323         .llseek  = seq_lseek,
 324         .release = seq_release_net,
 325 };
 326
 327 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 328 {
 329         struct net *net = seq_file_net(seq);
 330         int cpu;
 331
 332         if (*pos == 0)
 333                 return SEQ_START_TOKEN;
 334
 335         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 336                 if (!cpu_possible(cpu))
 337                         continue;
 338                 *pos = cpu+1;
 339                 return per_cpu_ptr(net->ct.stat, cpu);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 346 {
 347         struct net *net = seq_file_net(seq);
 348         int cpu;
 349
 350         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 351                 if (!cpu_possible(cpu))
 352                         continue;
 353                 *pos = cpu+1;
 354                 return per_cpu_ptr(net->ct.stat, cpu);
 355         }
 356
 357         return NULL;
 358 }
 359
 360 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 361 {
 362 }
 363
 364 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 365 {
 366         struct net *net = seq_file_net(seq);
 367         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 368         const struct ip_conntrack_stat *st = v;
 369
 370         if (v == SEQ_START_TOKEN) {
 371                 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");
 372                 return 0;
 373         }
 374
 375         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 376                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 377                    nr_conntracks,
 378                    st->searched,
 379                    st->found,
 380                    st->new,
 381                    st->invalid,
 382                    st->ignore,
 383                    st->delete,
 384                    st->delete_list,
 385                    st->insert,
 386                    st->insert_failed,
 387                    st->drop,
 388                    st->early_drop,
 389                    st->error,
 390
 391                    st->expect_new,
 392                    st->expect_create,
 393                    st->expect_delete,
 394                    st->search_restart
 395                 );
 396         return 0;
 397 }
 398
 399 static const struct seq_operations ct_cpu_seq_ops = {
 400         .start  = ct_cpu_seq_start,
 401         .next   = ct_cpu_seq_next,
 402         .stop   = ct_cpu_seq_stop,
 403         .show   = ct_cpu_seq_show,
 404 };
 405
 406 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 407 {
 408         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 409                             sizeof(struct seq_net_private));
 410 }
 411
 412 static const struct file_operations ct_cpu_seq_fops = {
 413         .owner   = THIS_MODULE,
 414         .open    = ct_cpu_seq_open,
 415         .read    = seq_read,
 416         .llseek  = seq_lseek,
 417         .release = seq_release_net,
 418 };
 419
 420 static int __net_init ip_conntrack_net_init(struct net *net)
 421 {
 422         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 423
 424         proc = proc_create("ip_conntrack", 0440, net->proc_net, &ct_file_ops);
 425         if (!proc)
 426                 goto err1;
 427
 428         proc_exp = proc_create("ip_conntrack_expect", 0440, net->proc_net,
 429                                &ip_exp_file_ops);
 430         if (!proc_exp)
 431                 goto err2;
 432
 433         proc_stat = proc_create("ip_conntrack", S_IRUGO,
 434                                 net->proc_net_stat, &ct_cpu_seq_fops);
 435         if (!proc_stat)
 436                 goto err3;
 437         return 0;
 438
 439 err3:
 440         remove_proc_entry("ip_conntrack_expect", net->proc_net);
 441 err2:
 442         remove_proc_entry("ip_conntrack", net->proc_net);
 443 err1:
 444         return -ENOMEM;
 445 }
 446
 447 static void __net_exit ip_conntrack_net_exit(struct net *net)
 448 {
 449         remove_proc_entry("ip_conntrack", net->proc_net_stat);
 450         remove_proc_entry("ip_conntrack_expect", net->proc_net);
 451         remove_proc_entry("ip_conntrack", net->proc_net);
 452 }
 453
 454 static struct pernet_operations ip_conntrack_net_ops = {
 455         .init = ip_conntrack_net_init,
 456         .exit = ip_conntrack_net_exit,
 457 };
 458
 459 int __init nf_conntrack_ipv4_compat_init(void)
 460 {
 461         return register_pernet_subsys(&ip_conntrack_net_ops);
 462 }
 463
 464 void __exit nf_conntrack_ipv4_compat_fini(void)
 465 {
 466         unregister_pernet_subsys(&ip_conntrack_net_ops);
 467 }