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 static int nf_ct_acct __read_mostly = NF_CT_ACCT_DEFAULT;
  26
  27 module_param_named(acct, nf_ct_acct, bool, 0644);
  28 MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
  29
  30 #ifdef CONFIG_SYSCTL
  31 static struct ctl_table acct_sysctl_table[] = {
  32         {
  33                 .ctl_name       = CTL_UNNUMBERED,
  34                 .procname       = "nf_conntrack_acct",
  35                 .data           = &init_net.ct.sysctl_acct,
  36                 .maxlen         = sizeof(unsigned int),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_dointvec,
  39         },
  40         {}
  41 };
  42 #endif /* CONFIG_SYSCTL */
  43
  44 unsigned int
  45 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
  46 {
  47         struct nf_conn_counter *acct;
  48
  49         acct = nf_conn_acct_find(ct);
  50         if (!acct)
  51                 return 0;
  52
  53         return seq_printf(s, "packets=%llu bytes=%llu ",
  54                           (unsigned long long)acct[dir].packets,
  55                           (unsigned long long)acct[dir].bytes);
  56 };
  57 EXPORT_SYMBOL_GPL(seq_print_acct);
  58
  59 static struct nf_ct_ext_type acct_extend __read_mostly = {
  60         .len    = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
  61         .align  = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
  62         .id     = NF_CT_EXT_ACCT,
  63 };
  64
  65 #ifdef CONFIG_SYSCTL
  66 static int nf_conntrack_acct_init_sysctl(struct net *net)
  67 {
  68         struct ctl_table *table;
  69
  70         table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
  71                         GFP_KERNEL);
  72         if (!table)
  73                 goto out;
  74
  75         table[0].data = &net->ct.sysctl_acct;
  76
  77         net->ct.acct_sysctl_header = register_net_sysctl_table(net,
  78                         nf_net_netfilter_sysctl_path, table);
  79         if (!net->ct.acct_sysctl_header) {
  80                 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
  81                 goto out_register;
  82         }
  83         return 0;
  84
  85 out_register:
  86         kfree(table);
  87 out:
  88         return -ENOMEM;
  89 }
  90
  91 static void nf_conntrack_acct_fini_sysctl(struct net *net)
  92 {
  93         struct ctl_table *table;
  94
  95         table = net->ct.acct_sysctl_header->ctl_table_arg;
  96         unregister_net_sysctl_table(net->ct.acct_sysctl_header);
  97         kfree(table);
  98 }
  99 #else
 100 static int nf_conntrack_acct_init_sysctl(struct net *net)
 101 {
 102         return 0;
 103 }
 104
 105 static void nf_conntrack_acct_fini_sysctl(struct net *net)
 106 {
 107 }
 108 #endif
 109
 110 int nf_conntrack_acct_init(struct net *net)
 111 {
 112         int ret;
 113
 114         net->ct.sysctl_acct = nf_ct_acct;
 115
 116         if (net_eq(net, &init_net)) {
 117 #ifdef CONFIG_NF_CT_ACCT
 118         printk(KERN_WARNING "CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use\n");
 119                 printk(KERN_WARNING "nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or\n");
 120                 printk(KERN_WARNING "sysctl net.netfilter.nf_conntrack_acct=1 to enable it.\n");
 121 #endif
 122
 123                 ret = nf_ct_extend_register(&acct_extend);
 124                 if (ret < 0) {
 125                         printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n");
 126                         goto out_extend_register;
 127                 }
 128         }
 129
 130         ret = nf_conntrack_acct_init_sysctl(net);
 131         if (ret < 0)
 132                 goto out_sysctl;
 133
 134         return 0;
 135
 136 out_sysctl:
 137         if (net_eq(net, &init_net))
 138                 nf_ct_extend_unregister(&acct_extend);
 139 out_extend_register:
 140         return ret;
 141 }
 142
 143 void nf_conntrack_acct_fini(struct net *net)
 144 {
 145         nf_conntrack_acct_fini_sysctl(net);
 146         if (net_eq(net, &init_net))
 147                 nf_ct_extend_unregister(&acct_extend);
 148 }