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 = kzalloc(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         return ret;
 189 out_free:
 190         kfree(st);
 191         return ret;
 192 }
 193
 194 static const struct file_operations ct_file_ops = {
 195         .owner   = THIS_MODULE,
 196         .open    = ct_open,
 197         .read    = seq_read,
 198         .llseek  = seq_lseek,
 199         .release = seq_release_private,
 200 };
 201
 202 /* expects */
 203 struct ct_expect_iter_state {
 204         unsigned int bucket;
 205 };
 206
 207 static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 208 {
 209         struct ct_expect_iter_state *st = seq->private;
 210
 211         for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
 212                 if (!hlist_empty(&nf_ct_expect_hash[st->bucket]))
 213                         return nf_ct_expect_hash[st->bucket].first;
 214         }
 215         return NULL;
 216 }
 217
 218 static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
 219                                              struct hlist_node *head)
 220 {
 221         struct ct_expect_iter_state *st = seq->private;
 222
 223         head = head->next;
 224         while (head == NULL) {
 225                 if (++st->bucket >= nf_ct_expect_hsize)
 226                         return NULL;
 227                 head = nf_ct_expect_hash[st->bucket].first;
 228         }
 229         return head;
 230 }
 231
 232 static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 233 {
 234         struct hlist_node *head = ct_expect_get_first(seq);
 235
 236         if (head)
 237                 while (pos && (head = ct_expect_get_next(seq, head)))
 238                         pos--;
 239         return pos ? NULL : head;
 240 }
 241
 242 static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
 243 {
 244         read_lock_bh(&nf_conntrack_lock);
 245         return ct_expect_get_idx(seq, *pos);
 246 }
 247
 248 static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 249 {
 250         (*pos)++;
 251         return ct_expect_get_next(seq, v);
 252 }
 253
 254 static void exp_seq_stop(struct seq_file *seq, void *v)
 255 {
 256         read_unlock_bh(&nf_conntrack_lock);
 257 }
 258
 259 static int exp_seq_show(struct seq_file *s, void *v)
 260 {
 261         struct nf_conntrack_expect *exp;
 262         struct hlist_node *n = v;
 263
 264         exp = hlist_entry(n, struct nf_conntrack_expect, hnode);
 265
 266         if (exp->tuple.src.l3num != AF_INET)
 267                 return 0;
 268
 269         if (exp->timeout.function)
 270                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 271                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 272         else
 273                 seq_printf(s, "- ");
 274
 275         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 276
 277         print_tuple(s, &exp->tuple,
 278                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 279                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 280                                          exp->tuple.dst.protonum));
 281         return seq_putc(s, '\n');
 282 }
 283
 284 static const struct seq_operations exp_seq_ops = {
 285         .start = exp_seq_start,
 286         .next = exp_seq_next,
 287         .stop = exp_seq_stop,
 288         .show = exp_seq_show
 289 };
 290
 291 static int exp_open(struct inode *inode, struct file *file)
 292 {
 293         struct seq_file *seq;
 294         struct ct_expect_iter_state *st;
 295         int ret;
 296
 297         st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
 298         if (st == NULL)
 299                 return -ENOMEM;
 300         ret = seq_open(file, &exp_seq_ops);
 301         if (ret)
 302                 goto out_free;
 303         seq          = file->private_data;
 304         seq->private = st;
 305         memset(st, 0, sizeof(struct ct_expect_iter_state));
 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("ip_conntrack", 0440, &ct_file_ops);
 413         if (!proc)
 414                 goto err1;
 415
 416         proc_exp = proc_net_fops_create("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, 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("ip_conntrack_expect");
 432 err2:
 433         proc_net_remove("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", proc_net_stat);
 441         proc_net_remove("ip_conntrack_expect");
 442         proc_net_remove("ip_conntrack");
 443 }