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