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 #ifdef CONFIG_NF_CT_ACCT
  22 static unsigned int
  23 seq_print_counters(struct seq_file *s,
  24                    const struct ip_conntrack_counter *counter)
  25 {
  26         return seq_printf(s, "packets=%llu bytes=%llu ",
  27                           (unsigned long long)counter->packets,
  28                           (unsigned long long)counter->bytes);
  29 }
  30 #else
  31 #define seq_print_counters(x, y)        0
  32 #endif
  33
  34 struct ct_iter_state {
  35         unsigned int bucket;
  36 };
  37
  38 static struct hlist_node *ct_get_first(struct seq_file *seq)
  39 {
  40         struct ct_iter_state *st = seq->private;
  41
  42         for (st->bucket = 0;
  43              st->bucket < nf_conntrack_htable_size;
  44              st->bucket++) {
  45                 if (!hlist_empty(&nf_conntrack_hash[st->bucket]))
  46                         return nf_conntrack_hash[st->bucket].first;
  47         }
  48         return NULL;
  49 }
  50
  51 static struct hlist_node *ct_get_next(struct seq_file *seq,
  52                                       struct hlist_node *head)
  53 {
  54         struct ct_iter_state *st = seq->private;
  55
  56         head = head->next;
  57         while (head == NULL) {
  58                 if (++st->bucket >= nf_conntrack_htable_size)
  59                         return NULL;
  60                 head = nf_conntrack_hash[st->bucket].first;
  61         }
  62         return head;
  63 }
  64
  65 static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
  66 {
  67         struct hlist_node *head = ct_get_first(seq);
  68
  69         if (head)
  70                 while (pos && (head = ct_get_next(seq, head)))
  71                         pos--;
  72         return pos ? NULL : head;
  73 }
  74
  75 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
  76 {
  77         read_lock_bh(&nf_conntrack_lock);
  78         return ct_get_idx(seq, *pos);
  79 }
  80
  81 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
  82 {
  83         (*pos)++;
  84         return ct_get_next(s, v);
  85 }
  86
  87 static void ct_seq_stop(struct seq_file *s, void *v)
  88 {
  89         read_unlock_bh(&nf_conntrack_lock);
  90 }
  91
  92 static int ct_seq_show(struct seq_file *s, void *v)
  93 {
  94         const struct nf_conntrack_tuple_hash *hash = v;
  95         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
  96         struct nf_conntrack_l3proto *l3proto;
  97         struct nf_conntrack_l4proto *l4proto;
  98
  99         NF_CT_ASSERT(ct);
 100
 101         /* we only want to print DIR_ORIGINAL */
 102         if (NF_CT_DIRECTION(hash))
 103                 return 0;
 104         if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num != AF_INET)
 105                 return 0;
 106
 107         l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 108                                        .tuple.src.l3num);
 109         NF_CT_ASSERT(l3proto);
 110         l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_ORIGINAL]
 111                                        .tuple.src.l3num,
 112                                        ct->tuplehash[IP_CT_DIR_ORIGINAL]
 113                                        .tuple.dst.protonum);
 114         NF_CT_ASSERT(l4proto);
 115
 116         if (seq_printf(s, "%-8s %u %ld ",
 117                       l4proto->name,
 118                       ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
 119                       timer_pending(&ct->timeout)
 120                       ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 121                 return -ENOSPC;
 122
 123         if (l3proto->print_conntrack(s, ct))
 124                 return -ENOSPC;
 125
 126         if (l4proto->print_conntrack(s, ct))
 127                 return -ENOSPC;
 128
 129         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 130                         l3proto, l4proto))
 131                 return -ENOSPC;
 132
 133         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 134                 return -ENOSPC;
 135
 136         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 137                 if (seq_printf(s, "[UNREPLIED] "))
 138                         return -ENOSPC;
 139
 140         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 141                         l3proto, l4proto))
 142                 return -ENOSPC;
 143
 144         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 145                 return -ENOSPC;
 146
 147         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 148                 if (seq_printf(s, "[ASSURED] "))
 149                         return -ENOSPC;
 150
 151 #ifdef CONFIG_NF_CONNTRACK_MARK
 152         if (seq_printf(s, "mark=%u ", ct->mark))
 153                 return -ENOSPC;
 154 #endif
 155
 156 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 157         if (seq_printf(s, "secmark=%u ", ct->secmark))
 158                 return -ENOSPC;
 159 #endif
 160
 161         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 162                 return -ENOSPC;
 163
 164         return 0;
 165 }
 166
 167 static const struct seq_operations ct_seq_ops = {
 168         .start = ct_seq_start,
 169         .next  = ct_seq_next,
 170         .stop  = ct_seq_stop,
 171         .show  = ct_seq_show
 172 };
 173
 174 static int ct_open(struct inode *inode, struct file *file)
 175 {
 176         struct seq_file *seq;
 177         struct ct_iter_state *st;
 178         int ret;
 179
 180         st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 181         if (st == NULL)
 182                 return -ENOMEM;
 183         ret = seq_open(file, &ct_seq_ops);
 184         if (ret)
 185                 goto out_free;
 186         seq          = file->private_data;
 187         seq->private = st;
 188         memset(st, 0, sizeof(struct ct_iter_state));
 189         return ret;
 190 out_free:
 191         kfree(st);
 192         return ret;
 193 }
 194
 195 static const struct file_operations ct_file_ops = {
 196         .owner   = THIS_MODULE,
 197         .open    = ct_open,
 198         .read    = seq_read,
 199         .llseek  = seq_lseek,
 200         .release = seq_release_private,
 201 };
 202
 203 /* expects */
 204 struct ct_expect_iter_state {
 205         unsigned int bucket;
 206 };
 207
 208 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 209 {
 210         struct ct_expect_iter_state *st = seq->private;
 211
 212         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 213                 if (!hlist_empty(&nf_ct_expect_hash[st->bucket]))
 214                         return nf_ct_expect_hash[st->bucket].first;
 215         }
 216         return NULL;
 217 }
 218
 219 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 220                                              struct hlist_node *head)
 221 {
 222         struct ct_expect_iter_state *st = seq->private;
 223
 224         head = head->next;
 225         while (head == NULL) {
 226                 if (++st->bucket >= nf_ct_expect_hsize)
 227                         return NULL;
 228                 head = nf_ct_expect_hash[st->bucket].first;
 229         }
 230         return head;
 231 }
 232
 233 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 234 {
 235         struct hlist_node *head = ct_expect_get_first(seq);
 236
 237         if (head)
 238                 while (pos && (head = ct_expect_get_next(seq, head)))
 239                         pos--;
 240         return pos ? NULL : head;
 241 }
 242
 243 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 244 {
 245         read_lock_bh(&nf_conntrack_lock);
 246         return ct_expect_get_idx(seq, *pos);
 247 }
 248
 249 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 250 {
 251         (*pos)++;
 252         return ct_expect_get_next(seq, v);
 253 }
 254
 255 static void exp_seq_stop(struct seq_file *seq, void *v)
 256 {
 257         read_unlock_bh(&nf_conntrack_lock);
 258 }
 259
 260 static int exp_seq_show(struct seq_file *s, void *v)
 261 {
 262         struct nf_conntrack_expect *exp;
 263         struct hlist_node *n = v;
 264
 265         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 266
 267         if (exp->tuple.src.l3num != AF_INET)
 268                 return 0;
 269
 270         if (exp->timeout.function)
 271                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 272                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 273         else
 274                 seq_printf(s, "- ");
 275
 276         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 277
 278         print_tuple(s, &exp->tuple,
 279                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 280                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 281                                          exp->tuple.dst.protonum));
 282         return seq_putc(s, '\n');
 283 }
 284
 285 static const struct seq_operations exp_seq_ops = {
 286         .start = exp_seq_start,
 287         .next = exp_seq_next,
 288         .stop = exp_seq_stop,
 289         .show = exp_seq_show
 290 };
 291
 292 static int exp_open(struct inode *inode, struct file *file)
 293 {
 294         struct seq_file *seq;
 295         struct ct_expect_iter_state *st;
 296         int ret;
 297
 298         st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
 299         if (st == NULL)
 300                 return -ENOMEM;
 301         ret = seq_open(file, &exp_seq_ops);
 302         if (ret)
 303                 goto out_free;
 304         seq          = file->private_data;
 305         seq->private = st;
 306         memset(st, 0, sizeof(struct ct_expect_iter_state));
 307         return ret;
 308 out_free:
 309         kfree(st);
 310         return ret;
 311 }
 312
 313 static const struct file_operations ip_exp_file_ops = {
 314         .owner   = THIS_MODULE,
 315         .open    = exp_open,
 316         .read    = seq_read,
 317         .llseek  = seq_lseek,
 318         .release = seq_release_private,
 319 };
 320
 321 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 322 {
 323         int cpu;
 324
 325         if (*pos == 0)
 326                 return SEQ_START_TOKEN;
 327
 328         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 329                 if (!cpu_possible(cpu))
 330                         continue;
 331                 *pos = cpu+1;
 332                 return &per_cpu(nf_conntrack_stat, cpu);
 333         }
 334
 335         return NULL;
 336 }
 337
 338 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 339 {
 340         int cpu;
 341
 342         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 343                 if (!cpu_possible(cpu))
 344                         continue;
 345                 *pos = cpu+1;
 346                 return &per_cpu(nf_conntrack_stat, cpu);
 347         }
 348
 349         return NULL;
 350 }
 351
 352 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 353 {
 354 }
 355
 356 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 357 {
 358         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 359         struct ip_conntrack_stat *st = v;
 360
 361         if (v == SEQ_START_TOKEN) {
 362                 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");
 363                 return 0;
 364         }
 365
 366         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 367                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 368                    nr_conntracks,
 369                    st->searched,
 370                    st->found,
 371                    st->new,
 372                    st->invalid,
 373                    st->ignore,
 374                    st->delete,
 375                    st->delete_list,
 376                    st->insert,
 377                    st->insert_failed,
 378                    st->drop,
 379                    st->early_drop,
 380                    st->error,
 381
 382                    st->expect_new,
 383                    st->expect_create,
 384                    st->expect_delete
 385                 );
 386         return 0;
 387 }
 388
 389 static const struct seq_operations ct_cpu_seq_ops = {
 390         .start  = ct_cpu_seq_start,
 391         .next   = ct_cpu_seq_next,
 392         .stop   = ct_cpu_seq_stop,
 393         .show   = ct_cpu_seq_show,
 394 };
 395
 396 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 397 {
 398         return seq_open(file, &ct_cpu_seq_ops);
 399 }
 400
 401 static const struct file_operations ct_cpu_seq_fops = {
 402         .owner   = THIS_MODULE,
 403         .open    = ct_cpu_seq_open,
 404         .read    = seq_read,
 405         .llseek  = seq_lseek,
 406         .release = seq_release_private,
 407 };
 408
 409 int __init nf_conntrack_ipv4_compat_init(void)
 410 {
 411         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 412
 413         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 414         if (!proc)
 415                 goto err1;
 416
 417         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 418                                         &ip_exp_file_ops);
 419         if (!proc_exp)
 420                 goto err2;
 421
 422         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 423         if (!proc_stat)
 424                 goto err3;
 425
 426         proc_stat->proc_fops = &ct_cpu_seq_fops;
 427         proc_stat->owner = THIS_MODULE;
 428
 429         return 0;
 430
 431 err3:
 432         proc_net_remove("ip_conntrack_expect");
 433 err2:
 434         proc_net_remove("ip_conntrack");
 435 err1:
 436         return -ENOMEM;
 437 }
 438
 439 void __exit nf_conntrack_ipv4_compat_fini(void)
 440 {
 441         remove_proc_entry("ip_conntrack", proc_net_stat);
 442         proc_net_remove("ip_conntrack_expect");
 443         proc_net_remove("ip_conntrack");
 444 }