err.no Git - linux-2.6/blob - 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 hlist_node *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 (!hlist_empty(&nf_conntrack_hash[st->bucket]))
  52                         return nf_conntrack_hash[st->bucket].first;
  53         }
  54         return NULL;
  55 }
  56
  57 static struct hlist_node *ct_get_next(struct seq_file *seq,
  58                                       struct hlist_node *head)
  59 {
  60         struct ct_iter_state *st = seq->private;
  61
  62         head = head->next;
  63         while (head == NULL) {
  64                 if (++st->bucket >= nf_conntrack_htable_size)
  65                         return NULL;
  66                 head = nf_conntrack_hash[st->bucket].first;
  67         }
  68         return head;
  69 }
  70
  71 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  72 {
  73         struct hlist_node *head = ct_get_first(seq);
  74
  75         if (head)
  76                 while (pos && (head = ct_get_next(seq, head)))
  77                         pos--;
  78         return pos ? NULL : head;
  79 }
  80
  81 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  82 {
  83         read_lock_bh(&nf_conntrack_lock);
  84         return ct_get_idx(seq, *pos);
  85 }
  86
  87 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  88 {
  89         (*pos)++;
  90         return ct_get_next(s, v);
  91 }
  92
  93 static void ct_seq_stop(struct seq_file *s, void *v)
  94 {
  95         read_unlock_bh(&nf_conntrack_lock);
  96 }
  97
  98 static int ct_seq_show(struct seq_file *s, void *v)
  99 {
 100         const struct nf_conntrack_tuple_hash *hash = v;
 101         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
 102         struct nf_conntrack_l3proto *l3proto;
 103         struct nf_conntrack_l4proto *l4proto;
 104
 105         NF_CT_ASSERT(ct);
 106
 107         /* we only want to print DIR_ORIGINAL */
 108         if (NF_CT_DIRECTION(hash))
 109                 return 0;
 110         if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num != AF_INET)
 111                 return 0;
 112
 113         l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 114                                        .tuple.src.l3num);
 115         NF_CT_ASSERT(l3proto);
 116         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 117                                        .tuple.src.l3num,
 118                                        ct->tuplehash[IP_CT_DIR_ORIGINAL]
 119                                        .tuple.dst.protonum);
 120         NF_CT_ASSERT(l4proto);
 121
 122         if (seq_printf(s, "%-8s %u %ld ",
 123                       l4proto->name,
 124                       ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 125                       timer_pending(&ct->timeout)
 126                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 127                 return -ENOSPC;
 128
 129         if (l3proto->print_conntrack(s, ct))
 130                 return -ENOSPC;
 131
 132         if (l4proto->print_conntrack(s, ct))
 133                 return -ENOSPC;
 134
 135         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 136                         l3proto, l4proto))
 137                 return -ENOSPC;
 138
 139         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 140                 return -ENOSPC;
 141
 142         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 143                 if (seq_printf(s, "[UNREPLIED] "))
 144                         return -ENOSPC;
 145
 146         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 147                         l3proto, l4proto))
 148                 return -ENOSPC;
 149
 150         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 151                 return -ENOSPC;
 152
 153         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 154                 if (seq_printf(s, "[ASSURED] "))
 155                         return -ENOSPC;
 156
 157 #ifdef CONFIG_NF_CONNTRACK_MARK
 158         if (seq_printf(s, "mark=%u ", ct->mark))
 159                 return -ENOSPC;
 160 #endif
 161
 162 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 163         if (seq_printf(s, "secmark=%u ", ct->secmark))
 164                 return -ENOSPC;
 165 #endif
 166
 167         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 168                 return -ENOSPC;
 169
 170         return 0;
 171 }
 172
 173 static struct seq_operations ct_seq_ops = {
 174         .start = ct_seq_start,
 175         .next  = ct_seq_next,
 176         .stop  = ct_seq_stop,
 177         .show  = ct_seq_show
 178 };
 179
 180 static int ct_open(struct inode *inode, struct file *file)
 181 {
 182         struct seq_file *seq;
 183         struct ct_iter_state *st;
 184         int ret;
 185
 186         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 187         if (st == NULL)
 188                 return -ENOMEM;
 189         ret = seq_open(file, &ct_seq_ops);
 190         if (ret)
 191                 goto out_free;
 192         seq          = file->private_data;
 193         seq->private = st;
 194         memset(st, 0, sizeof(struct ct_iter_state));
 195         return ret;
 196 out_free:
 197         kfree(st);
 198         return ret;
 199 }
 200
 201 static const struct file_operations ct_file_ops = {
 202         .owner   = THIS_MODULE,
 203         .open    = ct_open,
 204         .read    = seq_read,
 205         .llseek  = seq_lseek,
 206         .release = seq_release_private,
 207 };
 208
 209 /* expects */
 210 struct ct_expect_iter_state {
 211         unsigned int bucket;
 212 };
 213
 214 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 215 {
 216         struct ct_expect_iter_state *st = seq->private;
 217
 218         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 219                 if (!hlist_empty(&nf_ct_expect_hash[st->bucket]))
 220                         return nf_ct_expect_hash[st->bucket].first;
 221         }
 222         return NULL;
 223 }
 224
 225 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 226                                              struct hlist_node *head)
 227 {
 228         struct ct_expect_iter_state *st = seq->private;
 229
 230         head = head->next;
 231         while (head == NULL) {
 232                 if (++st->bucket >= nf_ct_expect_hsize)
 233                         return NULL;
 234                 head = nf_ct_expect_hash[st->bucket].first;
 235         }
 236         return head;
 237 }
 238
 239 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 240 {
 241         struct hlist_node *head = ct_expect_get_first(seq);
 242
 243         if (head)
 244                 while (pos && (head = ct_expect_get_next(seq, head)))
 245                         pos--;
 246         return pos ? NULL : head;
 247 }
 248
 249 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 250 {
 251         read_lock_bh(&nf_conntrack_lock);
 252         return ct_expect_get_idx(seq, *pos);
 253 }
 254
 255 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 256 {
 257         (*pos)++;
 258         return ct_expect_get_next(seq, v);
 259 }
 260
 261 static void exp_seq_stop(struct seq_file *seq, void *v)
 262 {
 263         read_unlock_bh(&nf_conntrack_lock);
 264 }
 265
 266 static int exp_seq_show(struct seq_file *s, void *v)
 267 {
 268         struct nf_conntrack_expect *exp;
 269         struct hlist_node *n = v;
 270
 271         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 272
 273         if (exp->tuple.src.l3num != AF_INET)
 274                 return 0;
 275
 276         if (exp->timeout.function)
 277                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 278                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 279         else
 280                 seq_printf(s, "- ");
 281
 282         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 283
 284         print_tuple(s, &exp->tuple,
 285                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 286                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 287                                          exp->tuple.dst.protonum));
 288         return seq_putc(s, '\n');
 289 }
 290
 291 static struct seq_operations exp_seq_ops = {
 292         .start = exp_seq_start,
 293         .next = exp_seq_next,
 294         .stop = exp_seq_stop,
 295         .show = exp_seq_show
 296 };
 297
 298 static int exp_open(struct inode *inode, struct file *file)
 299 {
 300         struct seq_file *seq;
 301         struct ct_expect_iter_state *st;
 302         int ret;
 303
 304         st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
 305         if (st == NULL)
 306                 return -ENOMEM;
 307         ret = seq_open(file, &exp_seq_ops);
 308         if (ret)
 309                 goto out_free;
 310         seq          = file->private_data;
 311         seq->private = st;
 312         memset(st, 0, sizeof(struct ct_expect_iter_state));
 313         return ret;
 314 out_free:
 315         kfree(st);
 316         return ret;
 317 }
 318
 319 static const struct file_operations ip_exp_file_ops = {
 320         .owner   = THIS_MODULE,
 321         .open    = exp_open,
 322         .read    = seq_read,
 323         .llseek  = seq_lseek,
 324         .release = seq_release_private,
 325 };
 326
 327 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 328 {
 329         int cpu;
 330
 331         if (*pos == 0)
 332                 return SEQ_START_TOKEN;
 333
 334         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 335                 if (!cpu_possible(cpu))
 336                         continue;
 337                 *pos = cpu+1;
 338                 return &per_cpu(nf_conntrack_stat, cpu);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 345 {
 346         int cpu;
 347
 348         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 349                 if (!cpu_possible(cpu))
 350                         continue;
 351                 *pos = cpu+1;
 352                 return &per_cpu(nf_conntrack_stat, cpu);
 353         }
 354
 355         return NULL;
 356 }
 357
 358 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 359 {
 360 }
 361
 362 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 363 {
 364         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 365         struct ip_conntrack_stat *st = v;
 366
 367         if (v == SEQ_START_TOKEN) {
 368                 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");
 369                 return 0;
 370         }
 371
 372         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 373                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 374                    nr_conntracks,
 375                    st->searched,
 376                    st->found,
 377                    st->new,
 378                    st->invalid,
 379                    st->ignore,
 380                    st->delete,
 381                    st->delete_list,
 382                    st->insert,
 383                    st->insert_failed,
 384                    st->drop,
 385                    st->early_drop,
 386                    st->error,
 387
 388                    st->expect_new,
 389                    st->expect_create,
 390                    st->expect_delete
 391                 );
 392         return 0;
 393 }
 394
 395 static struct seq_operations ct_cpu_seq_ops = {
 396         .start  = ct_cpu_seq_start,
 397         .next   = ct_cpu_seq_next,
 398         .stop   = ct_cpu_seq_stop,
 399         .show   = ct_cpu_seq_show,
 400 };
 401
 402 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 403 {
 404         return seq_open(file, &ct_cpu_seq_ops);
 405 }
 406
 407 static const struct file_operations ct_cpu_seq_fops = {
 408         .owner   = THIS_MODULE,
 409         .open    = ct_cpu_seq_open,
 410         .read    = seq_read,
 411         .llseek  = seq_lseek,
 412         .release = seq_release_private,
 413 };
 414
 415 int __init nf_conntrack_ipv4_compat_init(void)
 416 {
 417         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 418
 419         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 420         if (!proc)
 421                 goto err1;
 422
 423         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 424                                         &ip_exp_file_ops);
 425         if (!proc_exp)
 426                 goto err2;
 427
 428         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 429         if (!proc_stat)
 430                 goto err3;
 431
 432         proc_stat->proc_fops = &ct_cpu_seq_fops;
 433         proc_stat->owner = THIS_MODULE;
 434
 435         return 0;
 436
 437 err3:
 438         proc_net_remove("ip_conntrack_expect");
 439 err2:
 440         proc_net_remove("ip_conntrack");
 441 err1:
 442         return -ENOMEM;
 443 }
 444
 445 void __exit nf_conntrack_ipv4_compat_fini(void)
 446 {
 447         remove_proc_entry("ip_conntrack", proc_net_stat);
 448         proc_net_remove("ip_conntrack_expect");
 449         proc_net_remove("ip_conntrack");
 450 }