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 static void *exp_seq_start(struct seq_file *s, loff_t *pos)
 211 {
 212         struct list_head *e = &nf_ct_expect_list;
 213         loff_t i;
 214
 215         /* strange seq_file api calls stop even if we fail,
 216          * thus we need to grab lock since stop unlocks */
 217         read_lock_bh(&nf_conntrack_lock);
 218
 219         if (list_empty(e))
 220                 return NULL;
 221
 222         for (i = 0; i <= *pos; i++) {
 223                 e = e->next;
 224                 if (e == &nf_ct_expect_list)
 225                         return NULL;
 226         }
 227         return e;
 228 }
 229
 230 static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
 231 {
 232         struct list_head *e = v;
 233
 234         ++*pos;
 235         e = e->next;
 236
 237         if (e == &nf_ct_expect_list)
 238                 return NULL;
 239
 240         return e;
 241 }
 242
 243 static void exp_seq_stop(struct seq_file *s, void *v)
 244 {
 245         read_unlock_bh(&nf_conntrack_lock);
 246 }
 247
 248 static int exp_seq_show(struct seq_file *s, void *v)
 249 {
 250         struct nf_conntrack_expect *exp = v;
 251
 252         if (exp->tuple.src.l3num != AF_INET)
 253                 return 0;
 254
 255         if (exp->timeout.function)
 256                 seq_printf(s, "%ld ", timer_pending(&exp->timeout)
 257                            ? (long)(exp->timeout.expires - jiffies)/HZ : 0);
 258         else
 259                 seq_printf(s, "- ");
 260
 261         seq_printf(s, "proto=%u ", exp->tuple.dst.protonum);
 262
 263         print_tuple(s, &exp->tuple,
 264                     __nf_ct_l3proto_find(exp->tuple.src.l3num),
 265                     __nf_ct_l4proto_find(exp->tuple.src.l3num,
 266                                          exp->tuple.dst.protonum));
 267         return seq_putc(s, '\n');
 268 }
 269
 270 static struct seq_operations exp_seq_ops = {
 271         .start = exp_seq_start,
 272         .next = exp_seq_next,
 273         .stop = exp_seq_stop,
 274         .show = exp_seq_show
 275 };
 276
 277 static int exp_open(struct inode *inode, struct file *file)
 278 {
 279         return seq_open(file, &exp_seq_ops);
 280 }
 281
 282 static const struct file_operations ip_exp_file_ops = {
 283         .owner   = THIS_MODULE,
 284         .open    = exp_open,
 285         .read    = seq_read,
 286         .llseek  = seq_lseek,
 287         .release = seq_release
 288 };
 289
 290 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
 291 {
 292         int cpu;
 293
 294         if (*pos == 0)
 295                 return SEQ_START_TOKEN;
 296
 297         for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
 298                 if (!cpu_possible(cpu))
 299                         continue;
 300                 *pos = cpu+1;
 301                 return &per_cpu(nf_conntrack_stat, cpu);
 302         }
 303
 304         return NULL;
 305 }
 306
 307 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 308 {
 309         int cpu;
 310
 311         for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
 312                 if (!cpu_possible(cpu))
 313                         continue;
 314                 *pos = cpu+1;
 315                 return &per_cpu(nf_conntrack_stat, cpu);
 316         }
 317
 318         return NULL;
 319 }
 320
 321 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
 322 {
 323 }
 324
 325 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
 326 {
 327         unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
 328         struct ip_conntrack_stat *st = v;
 329
 330         if (v == SEQ_START_TOKEN) {
 331                 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");
 332                 return 0;
 333         }
 334
 335         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
 336                         "%08x %08x %08x %08x %08x  %08x %08x %08x \n",
 337                    nr_conntracks,
 338                    st->searched,
 339                    st->found,
 340                    st->new,
 341                    st->invalid,
 342                    st->ignore,
 343                    st->delete,
 344                    st->delete_list,
 345                    st->insert,
 346                    st->insert_failed,
 347                    st->drop,
 348                    st->early_drop,
 349                    st->error,
 350
 351                    st->expect_new,
 352                    st->expect_create,
 353                    st->expect_delete
 354                 );
 355         return 0;
 356 }
 357
 358 static struct seq_operations ct_cpu_seq_ops = {
 359         .start  = ct_cpu_seq_start,
 360         .next   = ct_cpu_seq_next,
 361         .stop   = ct_cpu_seq_stop,
 362         .show   = ct_cpu_seq_show,
 363 };
 364
 365 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
 366 {
 367         return seq_open(file, &ct_cpu_seq_ops);
 368 }
 369
 370 static const struct file_operations ct_cpu_seq_fops = {
 371         .owner   = THIS_MODULE,
 372         .open    = ct_cpu_seq_open,
 373         .read    = seq_read,
 374         .llseek  = seq_lseek,
 375         .release = seq_release_private,
 376 };
 377
 378 int __init nf_conntrack_ipv4_compat_init(void)
 379 {
 380         struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 381
 382         proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
 383         if (!proc)
 384                 goto err1;
 385
 386         proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
 387                                         &ip_exp_file_ops);
 388         if (!proc_exp)
 389                 goto err2;
 390
 391         proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
 392         if (!proc_stat)
 393                 goto err3;
 394
 395         proc_stat->proc_fops = &ct_cpu_seq_fops;
 396         proc_stat->owner = THIS_MODULE;
 397
 398         return 0;
 399
 400 err3:
 401         proc_net_remove("ip_conntrack_expect");
 402 err2:
 403         proc_net_remove("ip_conntrack");
 404 err1:
 405         return -ENOMEM;
 406 }
 407
 408 void __exit nf_conntrack_ipv4_compat_fini(void)
 409 {
 410         remove_proc_entry("ip_conntrack", proc_net_stat);
 411         proc_net_remove("ip_conntrack_expect");
 412         proc_net_remove("ip_conntrack");
 413 }