net/netfilter/nf_conntrack_timeout.c

   1 /*
   2  * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
   3  * (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation (or any later at your option).
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/netfilter.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/stddef.h>
  15 #include <linux/err.h>
  16 #include <linux/percpu.h>
  17 #include <linux/kernel.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/slab.h>
  20 #include <linux/export.h>
  21
  22 #include <net/netfilter/nf_conntrack.h>
  23 #include <net/netfilter/nf_conntrack_core.h>
  24 #include <net/netfilter/nf_conntrack_extend.h>
  25 #include <net/netfilter/nf_conntrack_timeout.h>
  26
  27 struct ctnl_timeout *
  28 (*nf_ct_timeout_find_get_hook)(const char *name) __read_mostly;
  29 EXPORT_SYMBOL_GPL(nf_ct_timeout_find_get_hook);
  30
  31 void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout) __read_mostly;
  32 EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
  33
  34 static struct nf_ct_ext_type timeout_extend __read_mostly = {
  35         .len    = sizeof(struct nf_conn_timeout),
  36         .align  = __alignof__(struct nf_conn_timeout),
  37         .id     = NF_CT_EXT_TIMEOUT,
  38 };
  39
  40 int nf_conntrack_timeout_init(struct net *net)
  41 {
  42         int ret = 0;
  43
  44         if (net_eq(net, &init_net)) {
  45                 ret = nf_ct_extend_register(&timeout_extend);
  46                 if (ret < 0) {
  47                         printk(KERN_ERR "nf_ct_timeout: Unable to register "
  48                                         "timeout extension.\n");
  49                         return ret;
  50                 }
  51         }
  52
  53         return 0;
  54 }
  55
  56 void nf_conntrack_timeout_fini(struct net *net)
  57 {
  58         if (net_eq(net, &init_net))
  59                 nf_ct_extend_unregister(&timeout_extend);
  60 }