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  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/types.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/percpu.h>
  14 #include <net/net_namespace.h>
  15
  16 #include <linux/netfilter.h>
  17 #include <net/netfilter/nf_conntrack_core.h>
  18 #include <net/netfilter/nf_conntrack_l3proto.h>
  19 #include <net/netfilter/nf_conntrack_l4proto.h>
  20 #include <net/netfilter/nf_conntrack_expect.h>
  21 #include <net/netfilter/nf_conntrack_acct.h>
  22
  23 struct ct_iter_state {
  24         struct seq_net_private p;
  25         unsigned int bucket;
  26 };
  27
  28 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
  29 {
  30         struct net *net = seq_file_net(seq);
  31         struct ct_iter_state *st = seq->private;
  32         struct hlist_nulls_node *n;
  33
  34         for (st->bucket = 0;
  35              st->bucket < nf_conntrack_htable_size;
  36              st->bucket++) {
  37                 n = rcu_dereference(net->ct.hash[st->bucket].first);
  38                 if (!is_a_nulls(n))
  39                         return n;
  40         }
  41         return NULL;
  42 }
  43
  44 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
  45                                       struct hlist_nulls_node *head)
  46 {
  47         struct net *net = seq_file_net(seq);
  48         struct ct_iter_state *st = seq->private;
  49
  50         head = rcu_dereference(head->next);
  51         while (is_a_nulls(head)) {
  52                 if (likely(get_nulls_value(head) == st->bucket)) {
  53                         if (++st->bucket >= nf_conntrack_htable_size)
  54                                 return NULL;
  55                 }
  56                 head = rcu_dereference(net->ct.hash[st->bucket].first);
  57         }
  58         return head;
  59 }
  60
  61 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  62 {
  63         struct hlist_nulls_node *head = ct_get_first(seq);
  64
  65         if (head)
  66                 while (pos && (head = ct_get_next(seq, head)))
  67                         pos--;
  68         return pos ? NULL : head;
  69 }
  70
  71 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  72         __acquires(RCU)
  73 {
  74         rcu_read_lock();
  75         return ct_get_idx(seq, *pos);
  76 }
  77
  78 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  79 {
  80         (*pos)++;
  81         return ct_get_next(s, v);
  82 }
  83
  84 static void ct_seq_stop(struct seq_file *s, void *v)
  85         __releases(RCU)
  86 {
  87         rcu_read_unlock();
  88 }
  89
  90 static int ct_seq_show(struct seq_file *s, void *v)
  91 {
  92         struct nf_conntrack_tuple_hash *hash = v;
  93         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
  94         const struct nf_conntrack_l3proto *l3proto;
  95         const struct nf_conntrack_l4proto *l4proto;
  96         int ret = 0;
  97
  98         NF_CT_ASSERT(ct);
  99         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
 100                 return 0;
 101
 102
 103         /* we only want to print DIR_ORIGINAL */
 104         if (NF_CT_DIRECTION(hash))
 105                 goto release;
 106         if (nf_ct_l3num(ct) != AF_INET)
 107                 goto release;
 108
 109         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 110         NF_CT_ASSERT(l3proto);
 111         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 112         NF_CT_ASSERT(l4proto);
 113
 114         ret = -ENOSPC;
 115         if (seq_printf(s, "%-8s %u %ld ",
 116                       l4proto->name, nf_ct_protonum(ct),
 117                       timer_pending(&ct->timeout)
 118                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 119                 goto release;
 120
 121         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 122                 goto release;
 123
 124         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 125                         l3proto, l4proto))
 126                 goto release;
 127
 128         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
 129                 goto release;
 130
 131         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 132                 if (seq_printf(s, "[UNREPLIED] "))
 133                         goto release;
 134
 135         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 136                         l3proto, l4proto))
 137                 goto release;
 138
 139         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
 140                 goto release;
 141
 142         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 143                 if (seq_printf(s, "[ASSURED] "))
 144                         goto release;
 145
 146 #ifdef CONFIG_NF_CONNTRACK_MARK
 147         if (seq_printf(s, "mark=%u ", ct->mark))
 148                 goto release;
 149 #endif
 150
 151 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 152         if (seq_printf(s, "secmark=%u ", ct->secmark))
 153                 goto release;
 154 #endif
 155
 156         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 157                 goto release;
 158         ret = 0;
 159 release:
 160         nf_ct_put(ct);
 161         return ret;
 162 }
 163
 164 static const struct seq_operations ct_seq_ops = {
 165         .start = ct_seq_start,
 166         .next  = ct_seq_next,
 167         .stop  = ct_seq_stop,
 168         .show  = ct_seq_show
 169 };
 170
 171 static int ct_open(struct inode *inode, struct file *file)
 172 {
 173         return seq_open_net(inode, file, &ct_seq_ops,
 174                             sizeof(struct ct_iter_state));
 175 }
 176
 177 static const struct file_operations ct_file_ops = {
 178         .owner   = THIS_MODULE,
 179         .open    = ct_open,
 180         .read    = seq_read,
 181         .llseek  = seq_lseek,
 182         .release = seq_release_net,
 183 };
 184
 185 /* expects */
 186 struct ct_expect_iter_state {
 187         struct seq_net_private p;
 188         unsigned int bucket;
 189 };
 190
 191 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 192 {
 193         struct net *net = seq_file_net(seq);
 194         struct ct_expect_iter_state *st = seq->private;
 195         struct hlist_node *n;
 196
 197         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 198                 n = rcu_dereference(net->ct.expect_hash[st->bucket].first);
 199                 if (n)
 200                         return n;
 201         }
 202         return NULL;
 203 }
 204
 205 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 206                                              struct hlist_node *head)
 207 {
 208         struct net *net = seq_file_net(seq);
 209         struct ct_expect_iter_state *st = seq->private;
 210
 211         head = rcu_dereference(head->next);
 212         while (head == NULL) {
 213                 if (++st->bucket >= nf_ct_expect_hsize)
 214                         return NULL;
 215                 head = rcu_dereference(net->ct.expect_hash[st->bucket].first);
 216         }
 217         return head;
 218 }
 219
 220 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 221 {
 222         struct hlist_node *head = ct_expect_get_first(seq);
 223
 224         if (head)
 225                 while (pos && (head = ct_expect_get_next(seq, head)))
 226                         pos--;
 227         return pos ? NULL : head;
 228 }
 229
 230 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 231         __acquires(RCU)
 232 {
 233         rcu_read_lock();
 234         return ct_expect_get_idx(seq, *pos);
 235 }
 236
 237 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 238 {
 239         (*pos)++;
 240         return ct_expect_get_next(seq, v);
 241 }
 242
 243 static void exp_seq_stop(struct seq_file *seq, void *v)
 244         __releases(RCU)
 245 {
 246         rcu_read_unlock();
 247 }
 248
 249 static int exp_seq_show(struct seq_file *s, void *v)
 250 {
 251         struct nf_conntrack_expect *exp;
 252         const struct hlist_node *n = v;
 253
 254         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 255
 256         if (exp->tuple.src.l3num != AF_INET)
 257                 return 0;
 258
 259         if (exp->timeout.function)
 260                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 261                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 262         else
 263                 seq_printf(s, "- ");
 264
 265         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 266
 267         print_tuple(s, &exp->tuple,
 268                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 269                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 270                                          exp->tuple.dst.protonum));
 271         return seq_putc(s, '\n');
 272 }
 273
 274 static const struct seq_operations exp_seq_ops = {
 275         .start = exp_seq_start,
 276         .next = exp_seq_next,
 277         .stop = exp_seq_stop,
 278         .show = exp_seq_show
 279 };
 280
 281 static int exp_open(struct inode *inode, struct file *file)
 282 {
 283         return seq_open_net(inode, file, &exp_seq_ops,
 284                             sizeof(struct ct_expect_iter_state));
 285 }
 286
 287 static const struct file_operations ip_exp_file_ops = {
 288         .owner   = THIS_MODULE,
 289         .open    = exp_open,
 290         .read    = seq_read,
 291         .llseek  = seq_lseek,
 292         .release = seq_release_net,
 293 };
 294
 295 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 296 {
 297         struct net *net = seq_file_net(seq);
 298         int cpu;
 299
 300         if (*pos == 0)
 301                 return SEQ_START_TOKEN;
 302
 303         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
 304                 if (!cpu_possible(cpu))
 305                         continue;
 306                 *pos = cpu+1;
 307                 return per_cpu_ptr(net->ct.stat, cpu);
 308         }
 309
 310         return NULL;
 311 }
 312
 313 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 314 {
 315         struct net *net = seq_file_net(seq);
 316         int cpu;
 317
 318         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
 319                 if (!cpu_possible(cpu))
 320                         continue;
 321                 *pos = cpu+1;
 322                 return per_cpu_ptr(net->ct.stat, cpu);
 323         }
 324
 325         return NULL;
 326 }
 327
 328 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 329 {
 330 }
 331
 332 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 333 {
 334         struct net *net = seq_file_net(seq);
 335         unsigned int nr_conntracks = atomic_read(&net->ct.count);
 336         const struct ip_conntrack_stat *st = v;
 337
 338         if (v == SEQ_START_TOKEN) {
 339                 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");
 340                 return 0;
 341         }
 342
 343         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 344                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 345                    nr_conntracks,
 346                    st->searched,
 347                    st->found,
 348                    st->new,
 349                    st->invalid,
 350                    st->ignore,
 351                    st->delete,
 352                    st->delete_list,
 353                    st->insert,
 354                    st->insert_failed,
 355                    st->drop,
 356                    st->early_drop,
 357                    st->error,
 358
 359                    st->expect_new,
 360                    st->expect_create,
 361                    st->expect_delete
 362                 );
 363         return 0;
 364 }
 365
 366 static const struct seq_operations ct_cpu_seq_ops = {
 367         .start  = ct_cpu_seq_start,
 368         .next   = ct_cpu_seq_next,
 369         .stop   = ct_cpu_seq_stop,
 370         .show   = ct_cpu_seq_show,
 371 };
 372
 373 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 374 {
 375         return seq_open_net(inode, file, &ct_cpu_seq_ops,
 376                             sizeof(struct seq_net_private));
 377 }
 378
 379 static const struct file_operations ct_cpu_seq_fops = {
 380         .owner   = THIS_MODULE,
 381         .open    = ct_cpu_seq_open,
 382         .read    = seq_read,
 383         .llseek  = seq_lseek,
 384         .release = seq_release_net,
 385 };
 386
 387 static int __net_init ip_conntrack_net_init(struct net *net)
 388 {
 389         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 390
 391         proc = proc_net_fops_create(net, "ip_conntrack", 0440, &ct_file_ops);
 392         if (!proc)
 393                 goto err1;
 394
 395         proc_exp = proc_net_fops_create(net, "ip_conntrack_expect", 0440,
 396                                         &ip_exp_file_ops);
 397         if (!proc_exp)
 398                 goto err2;
 399
 400         proc_stat = proc_create("ip_conntrack", S_IRUGO,
 401                                 net->proc_net_stat, &ct_cpu_seq_fops);
 402         if (!proc_stat)
 403                 goto err3;
 404         return 0;
 405
 406 err3:
 407         proc_net_remove(net, "ip_conntrack_expect");
 408 err2:
 409         proc_net_remove(net, "ip_conntrack");
 410 err1:
 411         return -ENOMEM;
 412 }
 413
 414 static void __net_exit ip_conntrack_net_exit(struct net *net)
 415 {
 416         remove_proc_entry("ip_conntrack", net->proc_net_stat);
 417         proc_net_remove(net, "ip_conntrack_expect");
 418         proc_net_remove(net, "ip_conntrack");
 419 }
 420
 421 static struct pernet_operations ip_conntrack_net_ops = {
 422         .init = ip_conntrack_net_init,
 423         .exit = ip_conntrack_net_exit,
 424 };
 425
 426 int __init nf_conntrack_ipv4_compat_init(void)
 427 {
 428         return register_pernet_subsys(&ip_conntrack_net_ops);
 429 }
 430
 431 void __exit nf_conntrack_ipv4_compat_fini(void)
 432 {
 433         unregister_pernet_subsys(&ip_conntrack_net_ops);
 434 }