net/netfilter/nf_conntrack_proto_generic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* (C) 1999-2001 Paul `Rusty' Russell
   3  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   4  */
   5
   6 #include <linux/types.h>
   7 #include <linux/jiffies.h>
   8 #include <linux/timer.h>
   9 #include <linux/netfilter.h>
  10 #include <net/netfilter/nf_conntrack_l4proto.h>
  11 #include <net/netfilter/nf_conntrack_timeout.h>
  12
  13 static const unsigned int nf_ct_generic_timeout = 600*HZ;
  14
  15 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  16
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nfnetlink_cttimeout.h>
  19
  20 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
  21                                          struct net *net, void *data)
  22 {
  23         struct nf_generic_net *gn = nf_generic_pernet(net);
  24         unsigned int *timeout = data;
  25
  26         if (!timeout)
  27                 timeout = &gn->timeout;
  28
  29         if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
  30                 *timeout =
  31                     ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
  32         else {
  33                 /* Set default generic timeout. */
  34                 *timeout = gn->timeout;
  35         }
  36
  37         return 0;
  38 }
  39
  40 static int
  41 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
  42 {
  43         const unsigned int *timeout = data;
  44
  45         if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
  46                 goto nla_put_failure;
  47
  48         return 0;
  49
  50 nla_put_failure:
  51         return -ENOSPC;
  52 }
  53
  54 static const struct nla_policy
  55 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
  56         [CTA_TIMEOUT_GENERIC_TIMEOUT]   = { .type = NLA_U32 },
  57 };
  58 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  59
  60 void nf_conntrack_generic_init_net(struct net *net)
  61 {
  62         struct nf_generic_net *gn = nf_generic_pernet(net);
  63
  64         gn->timeout = nf_ct_generic_timeout;
  65 }
  66
  67 const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
  68 {
  69         .l4proto                = 255,
  70 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  71         .ctnl_timeout           = {
  72                 .nlattr_to_obj  = generic_timeout_nlattr_to_obj,
  73                 .obj_to_nlattr  = generic_timeout_obj_to_nlattr,
  74                 .nlattr_max     = CTA_TIMEOUT_GENERIC_MAX,
  75                 .obj_size       = sizeof(unsigned int),
  76                 .nla_policy     = generic_timeout_nla_policy,
  77         },
  78 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  79 };