LXR linux/net/netfilter/nf_conntrack_proto

   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
  13static 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
  20static 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
  40static int
  41generic_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
  50nla_put_failure:
  51        return -ENOSPC;
  52}
  53
  54static const struct nla_policy
  55generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
  56        [CTA_TIMEOUT_GENERIC_TIMEOUT]   = { .type = NLA_U32 },
  57};
  58#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  59
  60void 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
  67const 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};
  80