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/slab.h>
  13#include <linux/kernel.h>
  14#include <linux/moduleparam.h>
  15#include <linux/export.h>
  16
  17#include <net/netfilter/nf_conntrack.h>
  18#include <net/netfilter/nf_conntrack_extend.h>
  19#include <net/netfilter/nf_conntrack_acct.h>
  20
  21static bool nf_ct_acct __read_mostly;
  22
  23module_param_named(acct, nf_ct_acct, bool, 0644);
  24MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
  25
  26#ifdef CONFIG_SYSCTL
  27static struct ctl_table acct_sysctl_table[] = {
  28        {
  29                .procname       = "nf_conntrack_acct",
  30                .data           = &init_net.ct.sysctl_acct,
  31                .maxlen         = sizeof(unsigned int),
  32                .mode           = 0644,
  33                .proc_handler   = proc_dointvec,
  34        },
  35        {}
  36};
  37#endif /* CONFIG_SYSCTL */
  38
  39unsigned int
  40seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
  41{
  42        struct nf_conn_acct *acct;
  43        struct nf_conn_counter *counter;
  44
  45        acct = nf_conn_acct_find(ct);
  46        if (!acct)
  47                return 0;
  48
  49        counter = acct->counter;
  50        seq_printf(s, "packets=%llu bytes=%llu ",
  51                   (unsigned long long)atomic64_read(&counter[dir].packets),
  52                   (unsigned long long)atomic64_read(&counter[dir].bytes));
  53
  54        return 0;
  55};
  56EXPORT_SYMBOL_GPL(seq_print_acct);
  57
  58static struct nf_ct_ext_type acct_extend __read_mostly = {
  59        .len    = sizeof(struct nf_conn_acct),
  60        .align  = __alignof__(struct nf_conn_acct),
  61        .id     = NF_CT_EXT_ACCT,
  62};
  63
  64#ifdef CONFIG_SYSCTL
  65static 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        /* Don't export sysctls to unprivileged users */
  77        if (net->user_ns != &init_user_ns)
  78                table[0].procname = NULL;
  79
  80        net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter",
  81                                                         table);
  82        if (!net->ct.acct_sysctl_header) {
  83                printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
  84                goto out_register;
  85        }
  86        return 0;
  87
  88out_register:
  89        kfree(table);
  90out:
  91        return -ENOMEM;
  92}
  93
  94static void nf_conntrack_acct_fini_sysctl(struct net *net)
  95{
  96        struct ctl_table *table;
  97
  98        table = net->ct.acct_sysctl_header->ctl_table_arg;
  99        unregister_net_sysctl_table(net->ct.acct_sysctl_header);
 100        kfree(table);
 101}
 102#else
 103static int nf_conntrack_acct_init_sysctl(struct net *net)
 104{
 105        return 0;
 106}
 107
 108static void nf_conntrack_acct_fini_sysctl(struct net *net)
 109{
 110}
 111#endif
 112
 113int nf_conntrack_acct_pernet_init(struct net *net)
 114{
 115        net->ct.sysctl_acct = nf_ct_acct;
 116        return nf_conntrack_acct_init_sysctl(net);
 117}
 118
 119void nf_conntrack_acct_pernet_fini(struct net *net)
 120{
 121        nf_conntrack_acct_fini_sysctl(net);
 122}
 123
 124int nf_conntrack_acct_init(void)
 125{
 126        int ret = nf_ct_extend_register(&acct_extend);
 127        if (ret < 0)
 128                pr_err("nf_conntrack_acct: Unable to register extension\n");
 129        return ret;
 130}
 131
 132void nf_conntrack_acct_fini(void)
 133{
 134        nf_ct_extend_unregister(&acct_extend);
 135}
 136