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 (l3proto->print_conntrack(s, ct))
 129                 return -ENOSPC;
 130
 131         if (l4proto->print_conntrack(s, ct))
 132                 return -ENOSPC;
 133
 134         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 135                         l3proto, l4proto))
 136                 return -ENOSPC;
 137
 138         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 139                 return -ENOSPC;
 140
 141         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 142                 if (seq_printf(s, "[UNREPLIED] "))
 143                         return -ENOSPC;
 144
 145         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 146                         l3proto, l4proto))
 147                 return -ENOSPC;
 148
 149         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 150                 return -ENOSPC;
 151
 152         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 153                 if (seq_printf(s, "[ASSURED] "))
 154                         return -ENOSPC;
 155
 156 #ifdef CONFIG_NF_CONNTRACK_MARK
 157         if (seq_printf(s, "mark=%u ", ct->mark))
 158                 return -ENOSPC;
 159 #endif
 160
 161 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 162         if (seq_printf(s, "secmark=%u ", ct->secmark))
 163                 return -ENOSPC;
 164 #endif
 165
 166         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 167                 return -ENOSPC;
 168
 169         return 0;
 170 }
 171
 172 static struct seq_operations ct_seq_ops = {
 173         .start = ct_seq_start,
 174         .next  = ct_seq_next,
 175         .stop  = ct_seq_stop,
 176         .show  = ct_seq_show
 177 };
 178
 179 static int ct_open(struct inode *inode, struct file *file)
 180 {
 181         struct seq_file *seq;
 182         struct ct_iter_state *st;
 183         int ret;
 184
 185         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 186         if (st == NULL)
 187                 return -ENOMEM;
 188         ret = seq_open(file, &ct_seq_ops);
 189         if (ret)
 190                 goto out_free;
 191         seq          = file->private_data;
 192         seq->private = st;
 193         memset(st, 0, sizeof(struct ct_iter_state));
 194         return ret;
 195 out_free:
 196         kfree(st);
 197         return ret;
 198 }
 199
 200 static const struct file_operations ct_file_ops = {
 201         .owner   = THIS_MODULE,
 202         .open    = ct_open,
 203         .read    = seq_read,
 204         .llseek  = seq_lseek,
 205         .release = seq_release_private,
 206 };
 207
 208 /* expects */
 209 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 210 {
 211         struct list_head *e = &nf_conntrack_expect_list;
 212         loff_t i;
 213
 214         /* strange seq_file api calls stop even if we fail,
 215          * thus we need to grab lock since stop unlocks */
 216         read_lock_bh(&nf_conntrack_lock);
 217
 218         if (list_empty(e))
 219                 return NULL;
 220
 221         for (i = 0; i <= *pos; i++) {
 222                 e = e->next;
 223                 if (e == &nf_conntrack_expect_list)
 224                         return NULL;
 225         }
 226         return e;
 227 }
 228
 229 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 230 {
 231         struct list_head *e = v;
 232
 233         ++*pos;
 234         e = e->next;
 235
 236         if (e == &nf_conntrack_expect_list)
 237                 return NULL;
 238
 239         return e;
 240 }
 241
 242 static void exp_seq_stop(struct seq_file *s, void *v)
 243 {
 244         read_unlock_bh(&nf_conntrack_lock);
 245 }
 246
 247 static int exp_seq_show(struct seq_file *s, void *v)
 248 {
 249         struct nf_conntrack_expect *exp = v;
 250
 251         if (exp->tuple.src.l3num != AF_INET)
 252                 return 0;
 253
 254         if (exp->timeout.function)
 255                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 256                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 257         else
 258                 seq_printf(s, "- ");
 259
 260         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 261
 262         print_tuple(s, &exp->tuple,
 263                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 264                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 265                                          exp->tuple.dst.protonum));
 266         return seq_putc(s, '\n');
 267 }
 268
 269 static struct seq_operations exp_seq_ops = {
 270         .start = exp_seq_start,
 271         .next = exp_seq_next,
 272         .stop = exp_seq_stop,
 273         .show = exp_seq_show
 274 };
 275
 276 static int exp_open(struct inode *inode, struct file *file)
 277 {
 278         return seq_open(file, &exp_seq_ops);
 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
 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 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("ip_conntrack", 0440, &ct_file_ops);
 382         if (!proc)
 383                 goto err1;
 384
 385         proc_exp = proc_net_fops_create("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, 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("ip_conntrack_expect");
 401 err2:
 402         proc_net_remove("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", proc_net_stat);
 410         proc_net_remove("ip_conntrack_expect");
 411         proc_net_remove("ip_conntrack");
 412 }