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