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 int 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 0;
 106
 107         ret = seq_printf(s, "secctx=%s ", secctx);
 108
 109         security_release_secctx(secctx, len);
 110         return ret;
 111 }
 112 #else
 113 static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 114 {
 115         return 0;
 116 }
 117 #endif
 118
 119 static int ct_seq_show(struct seq_file *s, void *v)
 120 {
 121         struct nf_conntrack_tuple_hash *hash = v;
 122         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 123         const struct nf_conntrack_l3proto *l3proto;
 124         const struct nf_conntrack_l4proto *l4proto;
 125         int ret = 0;
 126
 127         NF_CT_ASSERT(ct);
 128         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 129                 return 0;
 130
 131
 132         /* we only want to print DIR_ORIGINAL */
 133         if (NF_CT_DIRECTION(hash))
 134                 goto release;
 135         if (nf_ct_l3num(ct) != AF_INET)
 136                 goto release;
 137
 138         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 139         NF_CT_ASSERT(l3proto);
 140         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 141         NF_CT_ASSERT(l4proto);
 142
 143         ret = -ENOSPC;
 144         if (seq_printf(s, "%-8s %u %ld ",
 145                       l4proto->name, nf_ct_protonum(ct),
 146                       timer_pending(&ct->timeout)
 147                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 148                 goto release;
 149
 150         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 151                 goto release;
 152
 153         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 154                         l3proto, l4proto))
 155                 goto release;
 156
 157         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 158                 goto release;
 159
 160         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 161                 if (seq_printf(s, "[UNREPLIED] "))
 162                         goto release;
 163
 164         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 165                         l3proto, l4proto))
 166                 goto release;
 167
 168         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 169                 goto release;
 170
 171         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 172                 if (seq_printf(s, "[ASSURED] "))
 173                         goto release;
 174
 175 #ifdef CONFIG_NF_CONNTRACK_MARK
 176         if (seq_printf(s, "mark=%u ", ct->mark))
 177                 goto release;
 178 #endif
 179
 180         if (ct_show_secctx(s, ct))
 181                 goto release;
 182
 183         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 184                 goto release;
 185         ret = 0;
 186 release:
 187         nf_ct_put(ct);
 188         return ret;
 189 }
 190
 191 static const struct seq_operations ct_seq_ops = {
 192         .start = ct_seq_start,
 193         .next  = ct_seq_next,
 194         .stop  = ct_seq_stop,
 195         .show  = ct_seq_show
 196 };
 197
 198 static int ct_open(struct inode *inode, struct file *file)
 199 {
 200         return seq_open_net(inode, file, &ct_seq_ops,
 201                             sizeof(struct ct_iter_state));
 202 }
 203
 204 static const struct file_operations ct_file_ops = {
 205         .owner   = THIS_MODULE,
 206         .open    = ct_open,
 207         .read    = seq_read,
 208         .llseek  = seq_lseek,
 209         .release = seq_release_net,
 210 };
 211
 212 /* expects */
 213 struct ct_expect_iter_state {
 214         struct seq_net_private p;
 215         unsigned int bucket;
 216 };
 217
 218 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 219 {
 220         struct net *net = seq_file_net(seq);
 221         struct ct_expect_iter_state *st = seq->private;
 222         struct hlist_node *n;
 223
 224         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 225                 n = rcu_dereference(
 226                         hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
 227                 if (n)
 228                         return n;
 229         }
 230         return NULL;
 231 }
 232
 233 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 234                                              struct hlist_node *head)
 235 {
 236         struct net *net = seq_file_net(seq);
 237         struct ct_expect_iter_state *st = seq->private;
 238
 239         head = rcu_dereference(hlist_next_rcu(head));
 240         while (head == NULL) {
 241                 if (++st->bucket >= nf_ct_expect_hsize)
 242                         return NULL;
 243                 head = rcu_dereference(
 244                         hlist_first_rcu(&net->ct.expect_hash[st->bucket]));
 245         }
 246         return head;
 247 }
 248
 249 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 250 {
 251         struct hlist_node *head = ct_expect_get_first(seq);
 252
 253         if (head)
 254                 while (pos && (head = ct_expect_get_next(seq, head)))
 255                         pos--;
 256         return pos ? NULL : head;
 257 }
 258
 259 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 260         __acquires(RCU)
 261 {
 262         rcu_read_lock();
 263         return ct_expect_get_idx(seq, *pos);
 264 }
 265
 266 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 267 {
 268         (*pos)++;
 269         return ct_expect_get_next(seq, v);
 270 }
 271
 272 static void exp_seq_stop(struct seq_file *seq, void *v)
 273         __releases(RCU)
 274 {
 275         rcu_read_unlock();
 276 }
 277
 278 static int exp_seq_show(struct seq_file *s, void *v)
 279 {
 280         struct nf_conntrack_expect *exp;
 281         const struct hlist_node *n = v;
 282
 283         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 284
 285         if (exp->tuple.src.l3num != AF_INET)
 286                 return 0;
 287
 288         if (exp->timeout.function)
 289                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 290                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 291         else
 292                 seq_printf(s, "- ");
 293
 294         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 295
 296         print_tuple(s, &exp->tuple,
 297                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 298                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 299                                          exp->tuple.dst.protonum));
 300         return seq_putc(s, '\n');
 301 }
 302
 303 static const struct seq_operations exp_seq_ops = {
 304         .start = exp_seq_start,
 305         .next = exp_seq_next,
 306         .stop = exp_seq_stop,
 307         .show = exp_seq_show
 308 };
 309
 310 static int exp_open(struct inode *inode, struct file *file)
 311 {
 312         return seq_open_net(inode, file, &exp_seq_ops,
 313                             sizeof(struct ct_expect_iter_state));
 314 }
 315
 316 static const struct file_operations ip_exp_file_ops = {
 317         .owner   = THIS_MODULE,
 318         .open    = exp_open,
 319         .read    = seq_read,
 320         .llseek  = seq_lseek,
 321         .release = seq_release_net,
 322 };
 323
 324 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 325 {
 326         struct net *net = seq_file_net(seq);
 327         int cpu;
 328
 329         if (*pos == 0)
 330                 return SEQ_START_TOKEN;
 331
 332         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 333                 if (!cpu_possible(cpu))
 334                         continue;
 335                 *pos = cpu+1;
 336                 return per_cpu_ptr(net->ct.stat, cpu);
 337         }
 338
 339         return NULL;
 340 }
 341
 342 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 343 {
 344         struct net *net = seq_file_net(seq);
 345         int cpu;
 346
 347         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 348                 if (!cpu_possible(cpu))
 349                         continue;
 350                 *pos = cpu+1;
 351                 return per_cpu_ptr(net->ct.stat, cpu);
 352         }
 353
 354         return NULL;
 355 }
 356
 357 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 358 {
 359 }
 360
 361 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 362 {
 363         struct net *net = seq_file_net(seq);
 364         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 365         const struct ip_conntrack_stat *st = v;
 366
 367         if (v == SEQ_START_TOKEN) {
 368                 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");
 369                 return 0;
 370         }
 371
 372         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 373                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
 374                    nr_conntracks,
 375                    st->searched,
 376                    st->found,
 377                    st->new,
 378                    st->invalid,
 379                    st->ignore,
 380                    st->delete,
 381                    st->delete_list,
 382                    st->insert,
 383                    st->insert_failed,
 384                    st->drop,
 385                    st->early_drop,
 386                    st->error,
 387
 388                    st->expect_new,
 389                    st->expect_create,
 390                    st->expect_delete,
 391                    st->search_restart
 392                 );
 393         return 0;
 394 }
 395
 396 static const struct seq_operations ct_cpu_seq_ops = {
 397         .start  = ct_cpu_seq_start,
 398         .next   = ct_cpu_seq_next,
 399         .stop   = ct_cpu_seq_stop,
 400         .show   = ct_cpu_seq_show,
 401 };
 402
 403 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 404 {
 405         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 406                             sizeof(struct seq_net_private));
 407 }
 408
 409 static const struct file_operations ct_cpu_seq_fops = {
 410         .owner   = THIS_MODULE,
 411         .open    = ct_cpu_seq_open,
 412         .read    = seq_read,
 413         .llseek  = seq_lseek,
 414         .release = seq_release_net,
 415 };
 416
 417 static int __net_init ip_conntrack_net_init(struct net *net)
 418 {
 419         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 420
 421         proc = proc_create("ip_conntrack", 0440, net->proc_net, &ct_file_ops);
 422         if (!proc)
 423                 goto err1;
 424
 425         proc_exp = proc_create("ip_conntrack_expect", 0440, net->proc_net,
 426                                &ip_exp_file_ops);
 427         if (!proc_exp)
 428                 goto err2;
 429
 430         proc_stat = proc_create("ip_conntrack", S_IRUGO,
 431                                 net->proc_net_stat, &ct_cpu_seq_fops);
 432         if (!proc_stat)
 433                 goto err3;
 434         return 0;
 435
 436 err3:
 437         remove_proc_entry("ip_conntrack_expect", net->proc_net);
 438 err2:
 439         remove_proc_entry("ip_conntrack", net->proc_net);
 440 err1:
 441         return -ENOMEM;
 442 }
 443
 444 static void __net_exit ip_conntrack_net_exit(struct net *net)
 445 {
 446         remove_proc_entry("ip_conntrack", net->proc_net_stat);
 447         remove_proc_entry("ip_conntrack_expect", net->proc_net);
 448         remove_proc_entry("ip_conntrack", net->proc_net);
 449 }
 450
 451 static struct pernet_operations ip_conntrack_net_ops = {
 452         .init = ip_conntrack_net_init,
 453         .exit = ip_conntrack_net_exit,
 454 };
 455
 456 int __init nf_conntrack_ipv4_compat_init(void)
 457 {
 458         return register_pernet_subsys(&ip_conntrack_net_ops);
 459 }
 460
 461 void __exit nf_conntrack_ipv4_compat_fini(void)
 462 {
 463         unregister_pernet_subsys(&ip_conntrack_net_ops);
 464 }