/*
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* (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation (or any later at your option).
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/netfilter.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_extend.h>
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#include <net/netfilter/nf_conntrack_timestamp.h>
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static bool nf_ct_tstamp __read_mostly;
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module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
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MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
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#ifdef CONFIG_SYSCTL
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static struct ctl_table tstamp_sysctl_table[] = {
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{
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.procname = "nf_conntrack_timestamp",
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.data = &init_net.ct.sysctl_tstamp,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{}
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};
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#endif /* CONFIG_SYSCTL */
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static const struct nf_ct_ext_type tstamp_extend = {
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.len = sizeof(struct nf_conn_tstamp),
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.align = __alignof__(struct nf_conn_tstamp),
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.id = NF_CT_EXT_TSTAMP,
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};
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#ifdef CONFIG_SYSCTL
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static int nf_conntrack_tstamp_init_sysctl(struct net *net)
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{
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struct ctl_table *table;
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table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table),
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GFP_KERNEL);
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if (!table)
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goto out;
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table[0].data = &net->ct.sysctl_tstamp;
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/* Don't export sysctls to unprivileged users */
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if (net->user_ns != &init_user_ns)
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table[0].procname = NULL;
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net->ct.tstamp_sysctl_header = register_net_sysctl(net, "net/netfilter",
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table);
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if (!net->ct.tstamp_sysctl_header) {
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pr_err("can't register to sysctl\n");
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goto out_register;
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}
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return 0;
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out_register:
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kfree(table);
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out:
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return -ENOMEM;
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}
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static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
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{
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struct ctl_table *table;
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table = net->ct.tstamp_sysctl_header->ctl_table_arg;
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unregister_net_sysctl_table(net->ct.tstamp_sysctl_header);
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kfree(table);
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}
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#else
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static int nf_conntrack_tstamp_init_sysctl(struct net *net)
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{
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return 0;
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}
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static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
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{
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}
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#endif
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int nf_conntrack_tstamp_pernet_init(struct net *net)
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{
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net->ct.sysctl_tstamp = nf_ct_tstamp;
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return nf_conntrack_tstamp_init_sysctl(net);
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}
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void nf_conntrack_tstamp_pernet_fini(struct net *net)
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{
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nf_conntrack_tstamp_fini_sysctl(net);
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}
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int nf_conntrack_tstamp_init(void)
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{
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int ret;
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ret = nf_ct_extend_register(&tstamp_extend);
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if (ret < 0)
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pr_err("Unable to register extension\n");
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return ret;
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}
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void nf_conntrack_tstamp_fini(void)
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{
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nf_ct_extend_unregister(&tstamp_extend);
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}
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