release/src-rt/linux/linux-2.6/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
  15 #include <linux/netfilter.h>
  16 #include <net/netfilter/nf_conntrack_core.h>
  17 #include <net/netfilter/nf_conntrack_l3proto.h>
  18 #include <net/netfilter/nf_conntrack_l4proto.h>
  19 #include <net/netfilter/nf_conntrack_expect.h>
  20
  21 #if 0
  22 #define DEBUGP printk
  23 #else
  24 #define DEBUGP(format, args...)
  25 #endif
  26
  27 #ifdef CONFIG_NF_CT_ACCT
  28 static unsigned int
  29 seq_print_counters(struct seq_file *s,
  30                    const struct ip_conntrack_counter *counter)
  31 {
  32         return seq_printf(s, "packets=%llu bytes=%llu ",
  33                           (unsigned long long)counter->packets,
  34                           (unsigned long long)counter->bytes);
  35 }
  36 #else
  37 #define seq_print_counters(x, y)        0
  38 #endif
  39
  40 struct ct_iter_state {
  41         unsigned int bucket;
  42 };
  43
  44 static struct list_head *ct_get_first(struct seq_file *seq)
  45 {
  46         struct ct_iter_state *st = seq->private;
  47
  48         for (st->bucket = 0;
  49              st->bucket < nf_conntrack_htable_size;
  50              st->bucket++) {
  51                 if (!list_empty(&nf_conntrack_hash[st->bucket]))
  52                         return nf_conntrack_hash[st->bucket].next;
  53         }
  54         return NULL;
  55 }
  56
  57 static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
  58 {
  59         struct ct_iter_state *st = seq->private;
  60
  61         head = head->next;
  62         while (head == &nf_conntrack_hash[st->bucket]) {
  63                 if (++st->bucket >= nf_conntrack_htable_size)
  64                         return NULL;
  65                 head = nf_conntrack_hash[st->bucket].next;
  66         }
  67         return head;
  68 }
  69
  70 static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
  71 {
  72         struct list_head *head = ct_get_first(seq);
  73
  74         if (head)
  75                 while (pos && (head = ct_get_next(seq, head)))
  76                         pos--;
  77         return pos ? NULL : head;
  78 }
  79
  80 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  81 {
  82         read_lock_bh(&nf_conntrack_lock);
  83         return ct_get_idx(seq, *pos);
  84 }
  85
  86 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  87 {
  88         (*pos)++;
  89         return ct_get_next(s, v);
  90 }
  91
  92 static void ct_seq_stop(struct seq_file *s, void *v)
  93 {
  94         read_unlock_bh(&nf_conntrack_lock);
  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         struct nf_conntrack_l3proto *l3proto;
 102         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 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 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 192 {
 193         struct list_head *e = &nf_conntrack_expect_list;
 194         loff_t i;
 195
 196         /* strange seq_file api calls stop even if we fail,
 197          * thus we need to grab lock since stop unlocks */
 198         read_lock_bh(&nf_conntrack_lock);
 199
 200         if (list_empty(e))
 201                 return NULL;
 202
 203         for (i = 0; i <= *pos; i++) {
 204                 e = e->next;
 205                 if (e == &nf_conntrack_expect_list)
 206                         return NULL;
 207         }
 208         return e;
 209 }
 210
 211 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 212 {
 213         struct list_head *e = v;
 214
 215         ++*pos;
 216         e = e->next;
 217
 218         if (e == &nf_conntrack_expect_list)
 219                 return NULL;
 220
 221         return e;
 222 }
 223
 224 static void exp_seq_stop(struct seq_file *s, void *v)
 225 {
 226         read_unlock_bh(&nf_conntrack_lock);
 227 }
 228
 229 static int exp_seq_show(struct seq_file *s, void *v)
 230 {
 231         struct nf_conntrack_expect *exp = v;
 232
 233         if (exp->tuple.src.l3num != AF_INET)
 234                 return 0;
 235
 236         if (exp->timeout.function)
 237                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 238                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 239         else
 240                 seq_printf(s, "- ");
 241
 242         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 243
 244         print_tuple(s, &exp->tuple,
 245                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 246                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 247                                          exp->tuple.dst.protonum));
 248         return seq_putc(s, '\n');
 249 }
 250
 251 static struct seq_operations exp_seq_ops = {
 252         .start = exp_seq_start,
 253         .next = exp_seq_next,
 254         .stop = exp_seq_stop,
 255         .show = exp_seq_show
 256 };
 257
 258 static int exp_open(struct inode *inode, struct file *file)
 259 {
 260         return seq_open(file, &exp_seq_ops);
 261 }
 262
 263 static const struct file_operations ip_exp_file_ops = {
 264         .owner   = THIS_MODULE,
 265         .open    = exp_open,
 266         .read    = seq_read,
 267         .llseek  = seq_lseek,
 268         .release = seq_release
 269 };
 270
 271 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 272 {
 273         int cpu;
 274
 275         if (*pos == 0)
 276                 return SEQ_START_TOKEN;
 277
 278         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 279                 if (!cpu_possible(cpu))
 280                         continue;
 281                 *pos = cpu+1;
 282                 return &per_cpu(nf_conntrack_stat, cpu);
 283         }
 284
 285         return NULL;
 286 }
 287
 288 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 289 {
 290         int cpu;
 291
 292         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 293                 if (!cpu_possible(cpu))
 294                         continue;
 295                 *pos = cpu+1;
 296                 return &per_cpu(nf_conntrack_stat, cpu);
 297         }
 298
 299         return NULL;
 300 }
 301
 302 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 303 {
 304 }
 305
 306 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 307 {
 308         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 309         struct ip_conntrack_stat *st = v;
 310
 311         if (v == SEQ_START_TOKEN) {
 312                 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");
 313                 return 0;
 314         }
 315
 316         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 317                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 318                    nr_conntracks,
 319                    st->searched,
 320                    st->found,
 321                    st->new,
 322                    st->invalid,
 323                    st->ignore,
 324                    st->delete,
 325                    st->delete_list,
 326                    st->insert,
 327                    st->insert_failed,
 328                    st->drop,
 329                    st->early_drop,
 330                    st->error,
 331
 332                    st->expect_new,
 333                    st->expect_create,
 334                    st->expect_delete
 335                 );
 336         return 0;
 337 }
 338
 339 static struct seq_operations ct_cpu_seq_ops = {
 340         .start  = ct_cpu_seq_start,
 341         .next   = ct_cpu_seq_next,
 342         .stop   = ct_cpu_seq_stop,
 343         .show   = ct_cpu_seq_show,
 344 };
 345
 346 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 347 {
 348         return seq_open(file, &ct_cpu_seq_ops);
 349 }
 350
 351 static const struct file_operations ct_cpu_seq_fops = {
 352         .owner   = THIS_MODULE,
 353         .open    = ct_cpu_seq_open,
 354         .read    = seq_read,
 355         .llseek  = seq_lseek,
 356         .release = seq_release_private,
 357 };
 358
 359 int __init nf_conntrack_ipv4_compat_init(void)
 360 {
 361         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 362
 363         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 364         if (!proc)
 365                 goto err1;
 366
 367         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 368                                         &ip_exp_file_ops);
 369         if (!proc_exp)
 370                 goto err2;
 371
 372         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 373         if (!proc_stat)
 374                 goto err3;
 375
 376         proc_stat->proc_fops = &ct_cpu_seq_fops;
 377         proc_stat->owner = THIS_MODULE;
 378
 379         return 0;
 380
 381 err3:
 382         proc_net_remove("ip_conntrack_expect");
 383 err2:
 384         proc_net_remove("ip_conntrack");
 385 err1:
 386         return -ENOMEM;
 387 }
 388
 389 void __exit nf_conntrack_ipv4_compat_fini(void)
 390 {
 391         remove_proc_entry("ip_conntrack", proc_net_stat);
 392         proc_net_remove("ip_conntrack_expect");
 393         proc_net_remove("ip_conntrack");
 394 }