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   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 (l3proto->print_conntrack(s, ct))
 125                 return -ENOSPC;
 126
 127         if (l4proto->print_conntrack(s, ct))
 128                 return -ENOSPC;
 129
 130         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
 131                         l3proto, l4proto))
 132                 return -ENOSPC;
 133
 134         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_ORIGINAL]))
 135                 return -ENOSPC;
 136
 137         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
 138                 if (seq_printf(s, "[UNREPLIED] "))
 139                         return -ENOSPC;
 140
 141         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
 142                         l3proto, l4proto))
 143                 return -ENOSPC;
 144
 145         if (seq_print_counters(s, &ct->counters[IP_CT_DIR_REPLY]))
 146                 return -ENOSPC;
 147
 148         if (test_bit(IPS_ASSURED_BIT, &ct->status))
 149                 if (seq_printf(s, "[ASSURED] "))
 150                         return -ENOSPC;
 151
 152 #ifdef CONFIG_NF_CONNTRACK_MARK
 153         if (seq_printf(s, "mark=%u ", ct->mark))
 154                 return -ENOSPC;
 155 #endif
 156
 157 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 158         if (seq_printf(s, "secmark=%u ", ct->secmark))
 159                 return -ENOSPC;
 160 #endif
 161
 162         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
 163                 return -ENOSPC;
 164
 165         return 0;
 166 }
 167
 168 static const struct seq_operations ct_seq_ops = {
 169         .start = ct_seq_start,
 170         .next  = ct_seq_next,
 171         .stop  = ct_seq_stop,
 172         .show  = ct_seq_show
 173 };
 174
 175 static int ct_open(struct inode *inode, struct file *file)
 176 {
 177         struct seq_file *seq;
 178         struct ct_iter_state *st;
 179         int ret;
 180
 181         st = kzalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
 182         if (st == NULL)
 183                 return -ENOMEM;
 184         ret = seq_open(file, &ct_seq_ops);
 185         if (ret)
 186                 goto out_free;
 187         seq          = file->private_data;
 188         seq->private = st;
 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 = kzalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
 299         if (!st)
 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         return ret;
 307 out_free:
 308         kfree(st);
 309         return ret;
 310 }
 311
 312 static const struct file_operations ip_exp_file_ops = {
 313         .owner   = THIS_MODULE,
 314         .open    = exp_open,
 315         .read    = seq_read,
 316         .llseek  = seq_lseek,
 317         .release = seq_release_private,
 318 };
 319
 320 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 321 {
 322         int cpu;
 323
 324         if (*pos == 0)
 325                 return SEQ_START_TOKEN;
 326
 327         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 328                 if (!cpu_possible(cpu))
 329                         continue;
 330                 *pos = cpu+1;
 331                 return &per_cpu(nf_conntrack_stat, cpu);
 332         }
 333
 334         return NULL;
 335 }
 336
 337 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 338 {
 339         int cpu;
 340
 341         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 342                 if (!cpu_possible(cpu))
 343                         continue;
 344                 *pos = cpu+1;
 345                 return &per_cpu(nf_conntrack_stat, cpu);
 346         }
 347
 348         return NULL;
 349 }
 350
 351 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 352 {
 353 }
 354
 355 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 356 {
 357         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 358         struct ip_conntrack_stat *st = v;
 359
 360         if (v == SEQ_START_TOKEN) {
 361                 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");
 362                 return 0;
 363         }
 364
 365         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 366                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 367                    nr_conntracks,
 368                    st->searched,
 369                    st->found,
 370                    st->new,
 371                    st->invalid,
 372                    st->ignore,
 373                    st->delete,
 374                    st->delete_list,
 375                    st->insert,
 376                    st->insert_failed,
 377                    st->drop,
 378                    st->early_drop,
 379                    st->error,
 380
 381                    st->expect_new,
 382                    st->expect_create,
 383                    st->expect_delete
 384                 );
 385         return 0;
 386 }
 387
 388 static const struct seq_operations ct_cpu_seq_ops = {
 389         .start  = ct_cpu_seq_start,
 390         .next   = ct_cpu_seq_next,
 391         .stop   = ct_cpu_seq_stop,
 392         .show   = ct_cpu_seq_show,
 393 };
 394
 395 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 396 {
 397         return seq_open(file, &ct_cpu_seq_ops);
 398 }
 399
 400 static const struct file_operations ct_cpu_seq_fops = {
 401         .owner   = THIS_MODULE,
 402         .open    = ct_cpu_seq_open,
 403         .read    = seq_read,
 404         .llseek  = seq_lseek,
 405         .release = seq_release_private,
 406 };
 407
 408 int __init nf_conntrack_ipv4_compat_init(void)
 409 {
 410         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 411
 412         proc = proc_net_fops_create(&init_net, "ip_conntrack", 0440, &ct_file_ops);
 413         if (!proc)
 414                 goto err1;
 415
 416         proc_exp = proc_net_fops_create(&init_net, "ip_conntrack_expect", 0440,
 417                                         &ip_exp_file_ops);
 418         if (!proc_exp)
 419                 goto err2;
 420
 421         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, init_net.proc_net_stat);
 422         if (!proc_stat)
 423                 goto err3;
 424
 425         proc_stat->proc_fops = &ct_cpu_seq_fops;
 426         proc_stat->owner = THIS_MODULE;
 427
 428         return 0;
 429
 430 err3:
 431         proc_net_remove(&init_net, "ip_conntrack_expect");
 432 err2:
 433         proc_net_remove(&init_net, "ip_conntrack");
 434 err1:
 435         return -ENOMEM;
 436 }
 437
 438 void __exit nf_conntrack_ipv4_compat_fini(void)
 439 {
 440         remove_proc_entry("ip_conntrack", init_net.proc_net_stat);
 441         proc_net_remove(&init_net, "ip_conntrack_expect");
 442         proc_net_remove(&init_net, "ip_conntrack");
 443 }