blob: 5a5bf7cb6508f4a9563efc8472d61e0573eb8aab [file] [log] [blame]
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_timeout.h>
static const unsigned int nf_ct_generic_timeout = 600*HZ;
static bool nf_generic_should_process(u8 proto)
{
switch (proto) {
#ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
case IPPROTO_GRE:
return false;
#endif
default:
return true;
}
}
/* Returns verdict for packet, or -1 for invalid. */
static int generic_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state)
{
const unsigned int *timeout = nf_ct_timeout_lookup(ct);
if (!nf_generic_should_process(nf_ct_protonum(ct))) {
pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n",
nf_ct_protonum(ct));
return -NF_ACCEPT;
}
if (!timeout)
timeout = &nf_generic_pernet(nf_ct_net(ct))->timeout;
nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
return NF_ACCEPT;
}
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_cttimeout.h>
static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
struct net *net, void *data)
{
struct nf_generic_net *gn = nf_generic_pernet(net);
unsigned int *timeout = data;
if (!timeout)
timeout = &gn->timeout;
if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
*timeout =
ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
else {
/* Set default generic timeout. */
*timeout = gn->timeout;
}
return 0;
}
static int
generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
{
const unsigned int *timeout = data;
if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
static const struct nla_policy
generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
[CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
};
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
#ifdef CONFIG_SYSCTL
static struct ctl_table generic_sysctl_table[] = {
{
.procname = "nf_conntrack_generic_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{ }
};
#endif /* CONFIG_SYSCTL */
static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
struct nf_generic_net *gn)
{
#ifdef CONFIG_SYSCTL
pn->ctl_table = kmemdup(generic_sysctl_table,
sizeof(generic_sysctl_table),
GFP_KERNEL);
if (!pn->ctl_table)
return -ENOMEM;
pn->ctl_table[0].data = &gn->timeout;
#endif
return 0;
}
static int generic_init_net(struct net *net)
{
struct nf_generic_net *gn = nf_generic_pernet(net);
struct nf_proto_net *pn = &gn->pn;
gn->timeout = nf_ct_generic_timeout;
return generic_kmemdup_sysctl_table(pn, gn);
}
static struct nf_proto_net *generic_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.generic.pn;
}
const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
{
.l4proto = 255,
.packet = generic_packet,
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
.ctnl_timeout = {
.nlattr_to_obj = generic_timeout_nlattr_to_obj,
.obj_to_nlattr = generic_timeout_obj_to_nlattr,
.nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
.obj_size = sizeof(unsigned int),
.nla_policy = generic_timeout_nla_policy,
},
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
.init_net = generic_init_net,
.get_net_proto = generic_get_net_proto,
};