root/net/netfilter/nf_conntrack_acct.c

DEFINITIONS

1. seq_print_acct
2. nf_conntrack_acct_init_sysctl
3. nf_conntrack_acct_fini_sysctl
4. nf_conntrack_acct_init_sysctl
5. nf_conntrack_acct_fini_sysctl
6. nf_conntrack_acct_init
7. nf_conntrack_acct_fini

/* Accouting handling for netfilter. */

/*
 * (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netfilter.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_acct.h>

#ifdef CONFIG_NF_CT_ACCT
#define NF_CT_ACCT_DEFAULT 1
#else
#define NF_CT_ACCT_DEFAULT 0
#endif

static int nf_ct_acct __read_mostly = NF_CT_ACCT_DEFAULT;

module_param_named(acct, nf_ct_acct, bool, 0644);
MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");

#ifdef CONFIG_SYSCTL
static struct ctl_table acct_sysctl_table[] = {
        {
                .ctl_name       = CTL_UNNUMBERED,
                .procname       = "nf_conntrack_acct",
                .data           = &init_net.ct.sysctl_acct,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec,
        },
        {}
};
#endif /* CONFIG_SYSCTL */

unsigned int
seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
{
        struct nf_conn_counter *acct;

        acct = nf_conn_acct_find(ct);
        if (!acct)
                return 0;

        return seq_printf(s, "packets=%llu bytes=%llu ",
                          (unsigned long long)acct[dir].packets,
                          (unsigned long long)acct[dir].bytes);
};
EXPORT_SYMBOL_GPL(seq_print_acct);

static struct nf_ct_ext_type acct_extend __read_mostly = {
        .len    = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
        .align  = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
        .id     = NF_CT_EXT_ACCT,
};

#ifdef CONFIG_SYSCTL
static int nf_conntrack_acct_init_sysctl(struct net *net)
{
        struct ctl_table *table;

        table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
                        GFP_KERNEL);
        if (!table)
                goto out;

        table[0].data = &net->ct.sysctl_acct;

        net->ct.acct_sysctl_header = register_net_sysctl_table(net,
                        nf_net_netfilter_sysctl_path, table);
        if (!net->ct.acct_sysctl_header) {
                printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
                goto out_register;
        }
        return 0;

out_register:
        kfree(table);
out:
        return -ENOMEM;
}

static void nf_conntrack_acct_fini_sysctl(struct net *net)
{
        struct ctl_table *table;

        table = net->ct.acct_sysctl_header->ctl_table_arg;
        unregister_net_sysctl_table(net->ct.acct_sysctl_header);
        kfree(table);
}
#else
static int nf_conntrack_acct_init_sysctl(struct net *net)
{
        return 0;
}

static void nf_conntrack_acct_fini_sysctl(struct net *net)
{
}
#endif

int nf_conntrack_acct_init(struct net *net)
{
        int ret;

        net->ct.sysctl_acct = nf_ct_acct;

        if (net_eq(net, &init_net)) {
#ifdef CONFIG_NF_CT_ACCT
                printk(KERN_WARNING "CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Plase use\n");
                printk(KERN_WARNING "nf_conntrack.acct=1 kernel paramater, acct=1 nf_conntrack module option or\n");
                printk(KERN_WARNING "sysctl net.netfilter.nf_conntrack_acct=1 to enable it.\n");
#endif

                ret = nf_ct_extend_register(&acct_extend);
                if (ret < 0) {
                        printk(KERN_ERR "nf_conntrack_acct: Unable to register extension\n");
                        goto out_extend_register;
                }
        }

        ret = nf_conntrack_acct_init_sysctl(net);
        if (ret < 0)
                goto out_sysctl;

        return 0;

out_sysctl:
        if (net_eq(net, &init_net))
                nf_ct_extend_unregister(&acct_extend);
out_extend_register:
        return ret;
}

void nf_conntrack_acct_fini(struct net *net)
{
        nf_conntrack_acct_fini_sysctl(net);
        if (net_eq(net, &init_net))
                nf_ct_extend_unregister(&acct_extend);
}