net/netfilter/nf_conntrack_acct.c

   1 /* Accouting handling for netfilter. */
   2
   3 /*
   4  * (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl>
   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
  11 #include <linux/netfilter.h>
  12 #include <linux/kernel.h>
  13 #include <linux/moduleparam.h>
  14
  15 #include <net/netfilter/nf_conntrack.h>
  16 #include <net/netfilter/nf_conntrack_extend.h>
  17 #include <net/netfilter/nf_conntrack_acct.h>
  18
  19 #ifdef CONFIG_NF_CT_ACCT
  20 #define NF_CT_ACCT_DEFAULT 1
  21 #else
  22 #define NF_CT_ACCT_DEFAULT 0
  23 #endif
  24
  25 int nf_ct_acct __read_mostly = NF_CT_ACCT_DEFAULT;
  26 EXPORT_SYMBOL_GPL(nf_ct_acct);
  27
  28 module_param_named(acct, nf_ct_acct, bool, 0644);
  29 MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
  30
  31 #ifdef CONFIG_SYSCTL
  32 static struct ctl_table_header *acct_sysctl_header;
  33 static struct ctl_table acct_sysctl_table[] = {
  34         {
  35                 .ctl_name       = CTL_UNNUMBERED,
  36                 .procname       = "nf_conntrack_acct",
  37                 .data           = &nf_ct_acct,
  38                 .maxlen         = sizeof(unsigned int),
  39                 .mode           = 0644,
  40                 .proc_handler   = &proc_dointvec,
  41         },
  42         {}
  43 };
  44 #endif /* CONFIG_SYSCTL */
  45
  46 unsigned int
  47 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
  48 {
  49         struct nf_conn_counter *acct;
  50
  51         acct = nf_conn_acct_find(ct);
  52         if (!acct)
  53                 return 0;
  54
  55         return seq_printf(s, "packets=%llu bytes=%llu ",
  56                           (unsigned long long)acct[dir].packets,
  57                           (unsigned long long)acct[dir].bytes);
  58 };
  59 EXPORT_SYMBOL_GPL(seq_print_acct);
  60
  61 static struct nf_ct_ext_type acct_extend __read_mostly = {
  62         .len    = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
  63         .align  = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
  64         .id     = NF_CT_EXT_ACCT,
  65 };
  66
  67 int nf_conntrack_acct_init(void)
  68 {
  69         int ret;
  70
  71 #ifdef CONFIG_NF_CT_ACCT
  72         printk(KERN_WARNING "CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Plase use\n");
  73         printk(KERN_WARNING "nf_conntrack.acct=1 kernel paramater, acct=1 nf_conntrack module option or\n");
  74         printk(KERN_WARNING "sysctl net.netfilter.nf_conntrack_acct=1 to enable it.\n");
  75 #endif
  76
  77         ret = nf_ct_extend_register(&acct_extend);
  78         if (ret < 0) {
  79                 printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n");
  80                 return ret;
  81         }
  82
  83 #ifdef CONFIG_SYSCTL
  84         acct_sysctl_header = register_sysctl_paths(nf_net_netfilter_sysctl_path,
  85                                 acct_sysctl_table);
  86
  87         if (!acct_sysctl_header) {
  88                 nf_ct_extend_unregister(&acct_extend);
  89
  90                 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
  91                 return -ENOMEM;
  92         }
  93 #endif
  94
  95         return 0;
  96 }
  97
  98 void nf_conntrack_acct_fini(void)
  99 {
 100 #ifdef CONFIG_SYSCTL
 101         unregister_sysctl_table(acct_sysctl_header);
 102 #endif
 103         nf_ct_extend_unregister(&acct_extend);
 104 }