net/netfilter/nf_conntrack_proto_generic.c

   1 /* (C) 1999-2001 Paul `Rusty' Russell
   2  * (C) 2002-2004 Netfilter Core Team <coreteam@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.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/timer.h>
  12 #include <linux/netfilter.h>
  13 #include <net/netfilter/nf_conntrack_l4proto.h>
  14 #include <net/netfilter/nf_conntrack_timeout.h>
  15
  16 static const unsigned int nf_ct_generic_timeout = 600*HZ;
  17
  18 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  19
  20 #include <linux/netfilter/nfnetlink.h>
  21 #include <linux/netfilter/nfnetlink_cttimeout.h>
  22
  23 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
  24                                          struct net *net, void *data)
  25 {
  26         struct nf_generic_net *gn = nf_generic_pernet(net);
  27         unsigned int *timeout = data;
  28
  29         if (!timeout)
  30                 timeout = &gn->timeout;
  31
  32         if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
  33                 *timeout =
  34                     ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
  35         else {
  36                 /* Set default generic timeout. */
  37                 *timeout = gn->timeout;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int
  44 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
  45 {
  46         const unsigned int *timeout = data;
  47
  48         if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
  49                 goto nla_put_failure;
  50
  51         return 0;
  52
  53 nla_put_failure:
  54         return -ENOSPC;
  55 }
  56
  57 static const struct nla_policy
  58 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
  59         [CTA_TIMEOUT_GENERIC_TIMEOUT]   = { .type = NLA_U32 },
  60 };
  61 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  62
  63 void nf_conntrack_generic_init_net(struct net *net)
  64 {
  65         struct nf_generic_net *gn = nf_generic_pernet(net);
  66
  67         gn->timeout = nf_ct_generic_timeout;
  68 }
  69
  70 const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
  71 {
  72         .l4proto                = 255,
  73 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  74         .ctnl_timeout           = {
  75                 .nlattr_to_obj  = generic_timeout_nlattr_to_obj,
  76                 .obj_to_nlattr  = generic_timeout_obj_to_nlattr,
  77                 .nlattr_max     = CTA_TIMEOUT_GENERIC_MAX,
  78                 .obj_size       = sizeof(unsigned int),
  79                 .nla_policy     = generic_timeout_nla_policy,
  80         },
  81 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  82 };