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
  22 #ifdef CONFIG_NF_CT_ACCT
  23 static unsigned int
  24 seq_print_counters(struct seq_file *s,
  25                    const struct ip_conntrack_counter *counter)
  26 {
  27         return seq_printf(s, "packets=%llu bytes=%llu ",
  28                           (unsigned long long)counter->packets,
  29                           (unsigned long long)counter->bytes);
  30 }
  31 #else
  32 #define seq_print_counters(x, y)        0
  33 #endif
  34
  35 struct ct_iter_state {
  36         unsigned int bucket;
  37 };
  38
  39 static struct hlist_node *ct_get_first(struct seq_file *seq)
  40 {
  41         struct ct_iter_state *st = seq->private;
  42         struct hlist_node *n;
  43
  44         for (st->bucket = 0;
  45              st->bucket < nf_conntrack_htable_size;
  46              st->bucket++) {
  47                 n = rcu_dereference(nf_conntrack_hash[st->bucket].first);
  48                 if (n)
  49                         return n;
  50         }
  51         return NULL;
  52 }
  53
  54 static struct hlist_node *ct_get_next(struct seq_file *seq,
  55                                       struct hlist_node *head)
  56 {
  57         struct ct_iter_state *st = seq->private;
  58
  59         head = rcu_dereference(head->next);
  60         while (head == NULL) {
  61                 if (++st->bucket >= nf_conntrack_htable_size)
  62                         return NULL;
  63                 head = rcu_dereference(nf_conntrack_hash[st->bucket].first);
  64         }
  65         return head;
  66 }
  67
  68 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  69 {
  70         struct hlist_node *head = ct_get_first(seq);
  71
  72         if (head)
  73                 while (pos && (head = ct_get_next(seq, head)))
  74                         pos--;
  75         return pos ? NULL : head;
  76 }
  77
  78 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  79         __acquires(RCU)
  80 {
  81         rcu_read_lock();
  82         return ct_get_idx(seq, *pos);
  83 }
  84
  85 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  86 {
  87         (*pos)++;
  88         return ct_get_next(s, v);
  89 }
  90
  91 static void ct_seq_stop(struct seq_file *s, void *v)
  92         __releases(RCU)
  93 {
  94         rcu_read_unlock();
  95 }
  96
  97 static int ct_seq_show(struct seq_file *s, void *v)
  98 {
  99         const struct nf_conntrack_tuple_hash *hash = v;
 100         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 101         const struct nf_conntrack_l3proto *l3proto;
 102         const struct nf_conntrack_l4proto *l4proto;
 103
 104         NF_CT_ASSERT(ct);
 105
 106         /* we only want to print DIR_ORIGINAL */
 107         if (NF_CT_DIRECTION(hash))
 108                 return 0;
 109         if (nf_ct_l3num(ct) != AF_INET)
 110                 return 0;
 111
 112         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 113         NF_CT_ASSERT(l3proto);
 114         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 115         NF_CT_ASSERT(l4proto);
 116
 117         if (seq_printf(s, "%-8s %u %ld ",
 118                       l4proto->name, nf_ct_protonum(ct),
 119                       timer_pending(&ct->timeout)
 120                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 121                 return -ENOSPC;
 122
 123         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 124                 return -ENOSPC;
 125
 126         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 127                         l3proto, l4proto))
 128                 return -ENOSPC;
 129
 130         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 131                 return -ENOSPC;
 132
 133         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 134                 if (seq_printf(s, "[UNREPLIED] "))
 135                         return -ENOSPC;
 136
 137         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 138                         l3proto, l4proto))
 139                 return -ENOSPC;
 140
 141         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 142                 return -ENOSPC;
 143
 144         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 145                 if (seq_printf(s, "[ASSURED] "))
 146                         return -ENOSPC;
 147
 148 #ifdef CONFIG_NF_CONNTRACK_MARK
 149         if (seq_printf(s, "mark=%u ", ct->mark))
 150                 return -ENOSPC;
 151 #endif
 152
 153 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 154         if (seq_printf(s, "secmark=%u ", ct->secmark))
 155                 return -ENOSPC;
 156 #endif
 157
 158         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 159                 return -ENOSPC;
 160
 161         return 0;
 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_private(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_private,
 183 };
 184
 185 /* expects */
 186 struct ct_expect_iter_state {
 187         unsigned int bucket;
 188 };
 189
 190 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 191 {
 192         struct ct_expect_iter_state *st = seq->private;
 193         struct hlist_node *n;
 194
 195         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 196                 n = rcu_dereference(nf_ct_expect_hash[st->bucket].first);
 197                 if (n)
 198                         return n;
 199         }
 200         return NULL;
 201 }
 202
 203 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 204                                              struct hlist_node *head)
 205 {
 206         struct ct_expect_iter_state *st = seq->private;
 207
 208         head = rcu_dereference(head->next);
 209         while (head == NULL) {
 210                 if (++st->bucket >= nf_ct_expect_hsize)
 211                         return NULL;
 212                 head = rcu_dereference(nf_ct_expect_hash[st->bucket].first);
 213         }
 214         return head;
 215 }
 216
 217 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 218 {
 219         struct hlist_node *head = ct_expect_get_first(seq);
 220
 221         if (head)
 222                 while (pos && (head = ct_expect_get_next(seq, head)))
 223                         pos--;
 224         return pos ? NULL : head;
 225 }
 226
 227 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 228         __acquires(RCU)
 229 {
 230         rcu_read_lock();
 231         return ct_expect_get_idx(seq, *pos);
 232 }
 233
 234 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 235 {
 236         (*pos)++;
 237         return ct_expect_get_next(seq, v);
 238 }
 239
 240 static void exp_seq_stop(struct seq_file *seq, void *v)
 241         __releases(RCU)
 242 {
 243         rcu_read_unlock();
 244 }
 245
 246 static int exp_seq_show(struct seq_file *s, void *v)
 247 {
 248         struct nf_conntrack_expect *exp;
 249         const struct hlist_node *n = v;
 250
 251         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 252
 253         if (exp->tuple.src.l3num != AF_INET)
 254                 return 0;
 255
 256         if (exp->timeout.function)
 257                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 258                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 259         else
 260                 seq_printf(s, "- ");
 261
 262         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 263
 264         print_tuple(s, &exp->tuple,
 265                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 266                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 267                                          exp->tuple.dst.protonum));
 268         return seq_putc(s, '\n');
 269 }
 270
 271 static const struct seq_operations exp_seq_ops = {
 272         .start = exp_seq_start,
 273         .next = exp_seq_next,
 274         .stop = exp_seq_stop,
 275         .show = exp_seq_show
 276 };
 277
 278 static int exp_open(struct inode *inode, struct file *file)
 279 {
 280         return seq_open_private(file, &exp_seq_ops,
 281                         sizeof(struct ct_expect_iter_state));
 282 }
 283
 284 static const struct file_operations ip_exp_file_ops = {
 285         .owner   = THIS_MODULE,
 286         .open    = exp_open,
 287         .read    = seq_read,
 288         .llseek  = seq_lseek,
 289         .release = seq_release_private,
 290 };
 291
 292 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 293 {
 294         int cpu;
 295
 296         if (*pos == 0)
 297                 return SEQ_START_TOKEN;
 298
 299         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 300                 if (!cpu_possible(cpu))
 301                         continue;
 302                 *pos = cpu+1;
 303                 return &per_cpu(nf_conntrack_stat, cpu);
 304         }
 305
 306         return NULL;
 307 }
 308
 309 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 310 {
 311         int cpu;
 312
 313         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 314                 if (!cpu_possible(cpu))
 315                         continue;
 316                 *pos = cpu+1;
 317                 return &per_cpu(nf_conntrack_stat, cpu);
 318         }
 319
 320         return NULL;
 321 }
 322
 323 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 324 {
 325 }
 326
 327 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 328 {
 329         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 330         const struct ip_conntrack_stat *st = v;
 331
 332         if (v == SEQ_START_TOKEN) {
 333                 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");
 334                 return 0;
 335         }
 336
 337         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 338                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 339                    nr_conntracks,
 340                    st->searched,
 341                    st->found,
 342                    st->new,
 343                    st->invalid,
 344                    st->ignore,
 345                    st->delete,
 346                    st->delete_list,
 347                    st->insert,
 348                    st->insert_failed,
 349                    st->drop,
 350                    st->early_drop,
 351                    st->error,
 352
 353                    st->expect_new,
 354                    st->expect_create,
 355                    st->expect_delete
 356                 );
 357         return 0;
 358 }
 359
 360 static const struct seq_operations ct_cpu_seq_ops = {
 361         .start  = ct_cpu_seq_start,
 362         .next   = ct_cpu_seq_next,
 363         .stop   = ct_cpu_seq_stop,
 364         .show   = ct_cpu_seq_show,
 365 };
 366
 367 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 368 {
 369         return seq_open(file, &ct_cpu_seq_ops);
 370 }
 371
 372 static const struct file_operations ct_cpu_seq_fops = {
 373         .owner   = THIS_MODULE,
 374         .open    = ct_cpu_seq_open,
 375         .read    = seq_read,
 376         .llseek  = seq_lseek,
 377         .release = seq_release,
 378 };
 379
 380 int __init nf_conntrack_ipv4_compat_init(void)
 381 {
 382         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 383
 384         proc = proc_net_fops_create(&init_net, "ip_conntrack", 0440, &ct_file_ops);
 385         if (!proc)
 386                 goto err1;
 387
 388         proc_exp = proc_net_fops_create(&init_net, "ip_conntrack_expect", 0440,
 389                                         &ip_exp_file_ops);
 390         if (!proc_exp)
 391                 goto err2;
 392
 393         proc_stat = proc_create("ip_conntrack", S_IRUGO,
 394                                 init_net.proc_net_stat, &ct_cpu_seq_fops);
 395         if (!proc_stat)
 396                 goto err3;
 397         return 0;
 398
 399 err3:
 400         proc_net_remove(&init_net, "ip_conntrack_expect");
 401 err2:
 402         proc_net_remove(&init_net, "ip_conntrack");
 403 err1:
 404         return -ENOMEM;
 405 }
 406
 407 void __exit nf_conntrack_ipv4_compat_fini(void)
 408 {
 409         remove_proc_entry("ip_conntrack", init_net.proc_net_stat);
 410         proc_net_remove(&init_net, "ip_conntrack_expect");
 411         proc_net_remove(&init_net, "ip_conntrack");
 412 }