LXR linux/net/netfilter/nf_conntrack

   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
  25static int nf_ct_acct __read_mostly = NF_CT_ACCT_DEFAULT;
  26
  27module_param_named(acct, nf_ct_acct, bool, 0644);
  28MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
  29
  30#ifdef CONFIG_SYSCTL
  31static 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
  44unsigned int
  45seq_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};
  57EXPORT_SYMBOL_GPL(seq_print_acct);
  58
  59static 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
  66static 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
  85out_register:
  86        kfree(table);
  87out:
  88        return -ENOMEM;
  89}
  90
  91static 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
 100static int nf_conntrack_acct_init_sysctl(struct net *net)
 101{
 102        return 0;
 103}
 104
 105static void nf_conntrack_acct_fini_sysctl(struct net *net)
 106{
 107}
 108#endif
 109
 110int 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
 136out_sysctl:
 137        if (net_eq(net, &init_net))
 138                nf_ct_extend_unregister(&acct_extend);
 139out_extend_register:
 140        return ret;
 141}
 142
 143void 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}
 149