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 (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num != AF_INET)
 110                 return 0;
 111
 112         l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 113                                        .tuple.src.l3num);
 114         NF_CT_ASSERT(l3proto);
 115         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 116                                        .tuple.src.l3num,
 117                                        ct->tuplehash[IP_CT_DIR_ORIGINAL]
 118                                        .tuple.dst.protonum);
 119         NF_CT_ASSERT(l4proto);
 120
 121         if (seq_printf(s, "%-8s %u %ld ",
 122                       l4proto->name,
 123                       ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 124                       timer_pending(&ct->timeout)
 125                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 126                 return -ENOSPC;
 127
 128         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 129                 return -ENOSPC;
 130
 131         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 132                         l3proto, l4proto))
 133                 return -ENOSPC;
 134
 135         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 136                 return -ENOSPC;
 137
 138         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 139                 if (seq_printf(s, "[UNREPLIED] "))
 140                         return -ENOSPC;
 141
 142         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 143                         l3proto, l4proto))
 144                 return -ENOSPC;
 145
 146         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 147                 return -ENOSPC;
 148
 149         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 150                 if (seq_printf(s, "[ASSURED] "))
 151                         return -ENOSPC;
 152
 153 #ifdef CONFIG_NF_CONNTRACK_MARK
 154         if (seq_printf(s, "mark=%u ", ct->mark))
 155                 return -ENOSPC;
 156 #endif
 157
 158 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 159         if (seq_printf(s, "secmark=%u ", ct->secmark))
 160                 return -ENOSPC;
 161 #endif
 162
 163         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 164                 return -ENOSPC;
 165
 166         return 0;
 167 }
 168
 169 static const struct seq_operations ct_seq_ops = {
 170         .start = ct_seq_start,
 171         .next  = ct_seq_next,
 172         .stop  = ct_seq_stop,
 173         .show  = ct_seq_show
 174 };
 175
 176 static int ct_open(struct inode *inode, struct file *file)
 177 {
 178         return seq_open_private(file, &ct_seq_ops,
 179                         sizeof(struct ct_iter_state));
 180 }
 181
 182 static const struct file_operations ct_file_ops = {
 183         .owner   = THIS_MODULE,
 184         .open    = ct_open,
 185         .read    = seq_read,
 186         .llseek  = seq_lseek,
 187         .release = seq_release_private,
 188 };
 189
 190 /* expects */
 191 struct ct_expect_iter_state {
 192         unsigned int bucket;
 193 };
 194
 195 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 196 {
 197         struct ct_expect_iter_state *st = seq->private;
 198         struct hlist_node *n;
 199
 200         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 201                 n = rcu_dereference(nf_ct_expect_hash[st->bucket].first);
 202                 if (n)
 203                         return n;
 204         }
 205         return NULL;
 206 }
 207
 208 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 209                                              struct hlist_node *head)
 210 {
 211         struct ct_expect_iter_state *st = seq->private;
 212
 213         head = rcu_dereference(head->next);
 214         while (head == NULL) {
 215                 if (++st->bucket >= nf_ct_expect_hsize)
 216                         return NULL;
 217                 head = rcu_dereference(nf_ct_expect_hash[st->bucket].first);
 218         }
 219         return head;
 220 }
 221
 222 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 223 {
 224         struct hlist_node *head = ct_expect_get_first(seq);
 225
 226         if (head)
 227                 while (pos && (head = ct_expect_get_next(seq, head)))
 228                         pos--;
 229         return pos ? NULL : head;
 230 }
 231
 232 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 233         __acquires(RCU)
 234 {
 235         rcu_read_lock();
 236         return ct_expect_get_idx(seq, *pos);
 237 }
 238
 239 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 240 {
 241         (*pos)++;
 242         return ct_expect_get_next(seq, v);
 243 }
 244
 245 static void exp_seq_stop(struct seq_file *seq, void *v)
 246         __releases(RCU)
 247 {
 248         rcu_read_unlock();
 249 }
 250
 251 static int exp_seq_show(struct seq_file *s, void *v)
 252 {
 253         struct nf_conntrack_expect *exp;
 254         const struct hlist_node *n = v;
 255
 256         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 257
 258         if (exp->tuple.src.l3num != AF_INET)
 259                 return 0;
 260
 261         if (exp->timeout.function)
 262                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 263                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 264         else
 265                 seq_printf(s, "- ");
 266
 267         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 268
 269         print_tuple(s, &exp->tuple,
 270                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 271                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 272                                          exp->tuple.dst.protonum));
 273         return seq_putc(s, '\n');
 274 }
 275
 276 static const struct seq_operations exp_seq_ops = {
 277         .start = exp_seq_start,
 278         .next = exp_seq_next,
 279         .stop = exp_seq_stop,
 280         .show = exp_seq_show
 281 };
 282
 283 static int exp_open(struct inode *inode, struct file *file)
 284 {
 285         return seq_open_private(file, &exp_seq_ops,
 286                         sizeof(struct ct_expect_iter_state));
 287 }
 288
 289 static const struct file_operations ip_exp_file_ops = {
 290         .owner   = THIS_MODULE,
 291         .open    = exp_open,
 292         .read    = seq_read,
 293         .llseek  = seq_lseek,
 294         .release = seq_release_private,
 295 };
 296
 297 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 298 {
 299         int cpu;
 300
 301         if (*pos == 0)
 302                 return SEQ_START_TOKEN;
 303
 304         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 305                 if (!cpu_possible(cpu))
 306                         continue;
 307                 *pos = cpu+1;
 308                 return &per_cpu(nf_conntrack_stat, cpu);
 309         }
 310
 311         return NULL;
 312 }
 313
 314 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 315 {
 316         int cpu;
 317
 318         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 319                 if (!cpu_possible(cpu))
 320                         continue;
 321                 *pos = cpu+1;
 322                 return &per_cpu(nf_conntrack_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         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 335         const struct ip_conntrack_stat *st = v;
 336
 337         if (v == SEQ_START_TOKEN) {
 338                 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");
 339                 return 0;
 340         }
 341
 342         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 343                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 344                    nr_conntracks,
 345                    st->searched,
 346                    st->found,
 347                    st->new,
 348                    st->invalid,
 349                    st->ignore,
 350                    st->delete,
 351                    st->delete_list,
 352                    st->insert,
 353                    st->insert_failed,
 354                    st->drop,
 355                    st->early_drop,
 356                    st->error,
 357
 358                    st->expect_new,
 359                    st->expect_create,
 360                    st->expect_delete
 361                 );
 362         return 0;
 363 }
 364
 365 static const struct seq_operations ct_cpu_seq_ops = {
 366         .start  = ct_cpu_seq_start,
 367         .next   = ct_cpu_seq_next,
 368         .stop   = ct_cpu_seq_stop,
 369         .show   = ct_cpu_seq_show,
 370 };
 371
 372 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 373 {
 374         return seq_open(file, &ct_cpu_seq_ops);
 375 }
 376
 377 static const struct file_operations ct_cpu_seq_fops = {
 378         .owner   = THIS_MODULE,
 379         .open    = ct_cpu_seq_open,
 380         .read    = seq_read,
 381         .llseek  = seq_lseek,
 382         .release = seq_release,
 383 };
 384
 385 int __init nf_conntrack_ipv4_compat_init(void)
 386 {
 387         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 388
 389         proc = proc_net_fops_create(&init_net, "ip_conntrack", 0440, &ct_file_ops);
 390         if (!proc)
 391                 goto err1;
 392
 393         proc_exp = proc_net_fops_create(&init_net, "ip_conntrack_expect", 0440,
 394                                         &ip_exp_file_ops);
 395         if (!proc_exp)
 396                 goto err2;
 397
 398         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, init_net.proc_net_stat);
 399         if (!proc_stat)
 400                 goto err3;
 401
 402         proc_stat->proc_fops = &ct_cpu_seq_fops;
 403         proc_stat->owner = THIS_MODULE;
 404
 405         return 0;
 406
 407 err3:
 408         proc_net_remove(&init_net, "ip_conntrack_expect");
 409 err2:
 410         proc_net_remove(&init_net, "ip_conntrack");
 411 err1:
 412         return -ENOMEM;
 413 }
 414
 415 void __exit nf_conntrack_ipv4_compat_fini(void)
 416 {
 417         remove_proc_entry("ip_conntrack", init_net.proc_net_stat);
 418         proc_net_remove(&init_net, "ip_conntrack_expect");
 419         proc_net_remove(&init_net, "ip_conntrack");
 420 }