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