2 * (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation (or any later at your option).
9 #include <linux/netfilter.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/moduleparam.h>
14 #include <net/netfilter/nf_conntrack.h>
15 #include <net/netfilter/nf_conntrack_extend.h>
16 #include <net/netfilter/nf_conntrack_timestamp.h>
18 static int nf_ct_tstamp __read_mostly;
20 module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
21 MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
24 static struct ctl_table tstamp_sysctl_table[] = {
26 .procname = "nf_conntrack_timestamp",
27 .data = &init_net.ct.sysctl_tstamp,
28 .maxlen = sizeof(unsigned int),
30 .proc_handler = proc_dointvec,
34 #endif /* CONFIG_SYSCTL */
36 static struct nf_ct_ext_type tstamp_extend __read_mostly = {
37 .len = sizeof(struct nf_conn_tstamp),
38 .align = __alignof__(struct nf_conn_tstamp),
39 .id = NF_CT_EXT_TSTAMP,
43 static int nf_conntrack_tstamp_init_sysctl(struct net *net)
45 struct ctl_table *table;
47 table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table),
52 table[0].data = &net->ct.sysctl_tstamp;
54 net->ct.tstamp_sysctl_header = register_net_sysctl_table(net,
55 nf_net_netfilter_sysctl_path, table);
56 if (!net->ct.tstamp_sysctl_header) {
57 printk(KERN_ERR "nf_ct_tstamp: can't register to sysctl.\n");
68 static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
70 struct ctl_table *table;
72 table = net->ct.tstamp_sysctl_header->ctl_table_arg;
73 unregister_net_sysctl_table(net->ct.tstamp_sysctl_header);
77 static int nf_conntrack_tstamp_init_sysctl(struct net *net)
82 static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
87 int nf_conntrack_tstamp_init(struct net *net)
91 net->ct.sysctl_tstamp = nf_ct_tstamp;
93 if (net_eq(net, &init_net)) {
94 ret = nf_ct_extend_register(&tstamp_extend);
96 printk(KERN_ERR "nf_ct_tstamp: Unable to register "
98 goto out_extend_register;
102 ret = nf_conntrack_tstamp_init_sysctl(net);
109 if (net_eq(net, &init_net))
110 nf_ct_extend_unregister(&tstamp_extend);
115 void nf_conntrack_tstamp_fini(struct net *net)
117 nf_conntrack_tstamp_fini_sysctl(net);
118 if (net_eq(net, &init_net))
119 nf_ct_extend_unregister(&tstamp_extend);