| /* |
| * (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org> |
| * |
| * 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 (or any later at your option). |
| */ |
| |
| #include <linux/netfilter.h> |
| #include <linux/slab.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_timestamp.h> |
| |
| static bool nf_ct_tstamp __read_mostly; |
| |
| module_param_named(tstamp, nf_ct_tstamp, bool, 0644); |
| MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping."); |
| |
| #ifdef CONFIG_SYSCTL |
| static struct ctl_table tstamp_sysctl_table[] = { |
| { |
| .procname = "nf_conntrack_timestamp", |
| .data = &init_net.ct.sysctl_tstamp, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| {} |
| }; |
| #endif /* CONFIG_SYSCTL */ |
| |
| static const struct nf_ct_ext_type tstamp_extend = { |
| .len = sizeof(struct nf_conn_tstamp), |
| .align = __alignof__(struct nf_conn_tstamp), |
| .id = NF_CT_EXT_TSTAMP, |
| }; |
| |
| #ifdef CONFIG_SYSCTL |
| static int nf_conntrack_tstamp_init_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table), |
| GFP_KERNEL); |
| if (!table) |
| goto out; |
| |
| table[0].data = &net->ct.sysctl_tstamp; |
| |
| /* Don't export sysctls to unprivileged users */ |
| if (net->user_ns != &init_user_ns) |
| table[0].procname = NULL; |
| |
| net->ct.tstamp_sysctl_header = register_net_sysctl(net, "net/netfilter", |
| table); |
| if (!net->ct.tstamp_sysctl_header) { |
| printk(KERN_ERR "nf_ct_tstamp: can't register to sysctl.\n"); |
| goto out_register; |
| } |
| return 0; |
| |
| out_register: |
| kfree(table); |
| out: |
| return -ENOMEM; |
| } |
| |
| static void nf_conntrack_tstamp_fini_sysctl(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| table = net->ct.tstamp_sysctl_header->ctl_table_arg; |
| unregister_net_sysctl_table(net->ct.tstamp_sysctl_header); |
| kfree(table); |
| } |
| #else |
| static int nf_conntrack_tstamp_init_sysctl(struct net *net) |
| { |
| return 0; |
| } |
| |
| static void nf_conntrack_tstamp_fini_sysctl(struct net *net) |
| { |
| } |
| #endif |
| |
| int nf_conntrack_tstamp_pernet_init(struct net *net) |
| { |
| net->ct.sysctl_tstamp = nf_ct_tstamp; |
| return nf_conntrack_tstamp_init_sysctl(net); |
| } |
| |
| void nf_conntrack_tstamp_pernet_fini(struct net *net) |
| { |
| nf_conntrack_tstamp_fini_sysctl(net); |
| } |
| |
| int nf_conntrack_tstamp_init(void) |
| { |
| int ret; |
| ret = nf_ct_extend_register(&tstamp_extend); |
| if (ret < 0) |
| pr_err("nf_ct_tstamp: Unable to register extension\n"); |
| return ret; |
| } |
| |
| void nf_conntrack_tstamp_fini(void) |
| { |
| nf_ct_extend_unregister(&tstamp_extend); |
| } |