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/slab.h>
  13 #include <linux/kernel.h>
  14 #include <linux/moduleparam.h>
  15
  16 #include <net/netfilter/nf_conntrack.h>
  17 #include <net/netfilter/nf_conntrack_extend.h>
  18 #include <net/netfilter/nf_conntrack_acct.h>
  19
  20 static int nf_ct_acct __read_mostly;
  21
  22 module_param_named(acct, nf_ct_acct, bool, 0644);
  23 MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
  24
  25 #ifdef CONFIG_SYSCTL
  26 static struct ctl_table acct_sysctl_table[] = {
  27         {
  28                 .procname       = "nf_conntrack_acct",
  29                 .data           = &init_net.ct.sysctl_acct,
  30                 .maxlen         = sizeof(unsigned int),
  31                 .mode           = 0644,
  32                 .proc_handler   = proc_dointvec,
  33         },
  34         {}
  35 };
  36 #endif /* CONFIG_SYSCTL */
  37
  38 unsigned int
  39 seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
  40 {
  41         struct nf_conn_counter *acct;
  42
  43         acct = nf_conn_acct_find(ct);
  44         if (!acct)
  45                 return 0;
  46
  47         return seq_printf(s, "packets=%llu bytes=%llu ",
  48                           (unsigned long long)acct[dir].packets,
  49                           (unsigned long long)acct[dir].bytes);
  50 };
  51 EXPORT_SYMBOL_GPL(seq_print_acct);
  52
  53 static struct nf_ct_ext_type acct_extend __read_mostly = {
  54         .len    = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
  55         .align  = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
  56         .id     = NF_CT_EXT_ACCT,
  57 };
  58
  59 #ifdef CONFIG_SYSCTL
  60 static int nf_conntrack_acct_init_sysctl(struct net *net)
  61 {
  62         struct ctl_table *table;
  63
  64         table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
  65                         GFP_KERNEL);
  66         if (!table)
  67                 goto out;
  68
  69         table[0].data = &net->ct.sysctl_acct;
  70
  71         net->ct.acct_sysctl_header = register_net_sysctl_table(net,
  72                         nf_net_netfilter_sysctl_path, table);
  73         if (!net->ct.acct_sysctl_header) {
  74                 printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
  75                 goto out_register;
  76         }
  77         return 0;
  78
  79 out_register:
  80         kfree(table);
  81 out:
  82         return -ENOMEM;
  83 }
  84
  85 static void nf_conntrack_acct_fini_sysctl(struct net *net)
  86 {
  87         struct ctl_table *table;
  88
  89         table = net->ct.acct_sysctl_header->ctl_table_arg;
  90         unregister_net_sysctl_table(net->ct.acct_sysctl_header);
  91         kfree(table);
  92 }
  93 #else
  94 static int nf_conntrack_acct_init_sysctl(struct net *net)
  95 {
  96         return 0;
  97 }
  98
  99 static void nf_conntrack_acct_fini_sysctl(struct net *net)
 100 {
 101 }
 102 #endif
 103
 104 int nf_conntrack_acct_init(struct net *net)
 105 {
 106         int ret;
 107
 108         net->ct.sysctl_acct = nf_ct_acct;
 109
 110         if (net_eq(net, &init_net)) {
 111                 ret = nf_ct_extend_register(&acct_extend);
 112                 if (ret < 0) {
 113                         printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n");
 114                         goto out_extend_register;
 115                 }
 116         }
 117
 118         ret = nf_conntrack_acct_init_sysctl(net);
 119         if (ret < 0)
 120                 goto out_sysctl;
 121
 122         return 0;
 123
 124 out_sysctl:
 125         if (net_eq(net, &init_net))
 126                 nf_ct_extend_unregister(&acct_extend);
 127 out_extend_register:
 128         return ret;
 129 }
 130
 131 void nf_conntrack_acct_fini(struct net *net)
 132 {
 133         nf_conntrack_acct_fini_sysctl(net);
 134         if (net_eq(net, &init_net))
 135                 nf_ct_extend_unregister(&acct_extend);
 136 }