net/netfilter/nf_conntrack_timestamp.c

   1 /*
   2  * (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org>
   3  *
   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).
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/netfilter.h>
  12 #include <linux/slab.h>
  13 #include <linux/kernel.h>
  14 #include <linux/moduleparam.h>
  15
  16 #include <net/netfilter/nf_conntrack.h>
  17 #include <net/netfilter/nf_conntrack_extend.h>
  18 #include <net/netfilter/nf_conntrack_timestamp.h>
  19
  20 static bool nf_ct_tstamp __read_mostly;
  21
  22 module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
  23 MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
  24
  25 static const struct nf_ct_ext_type tstamp_extend = {
  26         .len    = sizeof(struct nf_conn_tstamp),
  27         .align  = __alignof__(struct nf_conn_tstamp),
  28         .id     = NF_CT_EXT_TSTAMP,
  29 };
  30
  31 void nf_conntrack_tstamp_pernet_init(struct net *net)
  32 {
  33         net->ct.sysctl_tstamp = nf_ct_tstamp;
  34 }
  35
  36 int nf_conntrack_tstamp_init(void)
  37 {
  38         int ret;
  39         ret = nf_ct_extend_register(&tstamp_extend);
  40         if (ret < 0)
  41                 pr_err("Unable to register extension\n");
  42         return ret;
  43 }
  44
  45 void nf_conntrack_tstamp_fini(void)
  46 {
  47         nf_ct_extend_unregister(&tstamp_extend);
  48 }