Staging
v0.5.2
v0.5.2
nf_nat_proto_dccp.c
/*
* DCCP NAT protocol helper
*
* Copyright (c) 2005, 2006. 2008 Patrick McHardy <kaber@trash.net>
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/dccp.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
static u_int16_t dccp_port_rover;
static void
dccp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&dccp_port_rover);
}
static bool
dccp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (const void *)(skb->data + iphdroff);
struct dccp_hdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl * 4;
__be32 oldip, newip;
__be16 *portptr, oldport, newport;
int hdrsize = 8; /* DCCP connection tracking guarantees this much */
if (skb->len >= hdroff + sizeof(struct dccp_hdr))
hdrsize = sizeof(struct dccp_hdr);
if (!skb_make_writable(skb, hdroff + hdrsize))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct dccp_hdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
oldip = iph->saddr;
newip = tuple->src.u3.ip;
newport = tuple->src.u.dccp.port;
portptr = &hdr->dccph_sport;
} else {
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
newport = tuple->dst.u.dccp.port;
portptr = &hdr->dccph_dport;
}
oldport = *portptr;
*portptr = newport;
if (hdrsize < sizeof(*hdr))
return true;
inet_proto_csum_replace4(&hdr->dccph_checksum, skb, oldip, newip, 1);
inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport,
0);
return true;
}
static const struct nf_nat_protocol nf_nat_protocol_dccp = {
.protonum = IPPROTO_DCCP,
.manip_pkt = dccp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.unique_tuple = dccp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_dccp_init(void)
{
return nf_nat_protocol_register(&nf_nat_protocol_dccp);
}
static void __exit nf_nat_proto_dccp_fini(void)
{
nf_nat_protocol_unregister(&nf_nat_protocol_dccp);
}
module_init(nf_nat_proto_dccp_init);
module_exit(nf_nat_proto_dccp_fini);
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_DESCRIPTION("DCCP NAT protocol helper");
MODULE_LICENSE("GPL");