Commit 4910a087 authored by Patrick McHardy's avatar Patrick McHardy

[NETFILTER]: nf_nat: add DCCP protocol support

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 2bc78049
......@@ -241,6 +241,11 @@ config NF_NAT_SNMP_BASIC
# <expr> '&&' <expr> (6)
#
# (6) Returns the result of min(/expr/, /expr/).
config NF_NAT_PROTO_DCCP
tristate
depends on NF_NAT && NF_CT_PROTO_DCCP
default NF_NAT && NF_CT_PROTO_DCCP
config NF_NAT_PROTO_GRE
tristate
depends on NF_NAT && NF_CT_PROTO_GRE
......
......@@ -29,6 +29,7 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
......
/*
* 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 int
dccp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
return nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&dccp_port_rover);
}
static int
dccp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
struct iphdr *iph = (struct iphdr *)(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 0;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct dccp_hdr *)(skb->data + hdroff);
if (maniptype == IP_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 1;
inet_proto_csum_replace4(&hdr->dccph_checksum, skb, oldip, newip, 1);
inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport,
0);
return 1;
}
static const struct nf_nat_protocol nf_nat_protocol_dccp = {
.protonum = IPPROTO_DCCP,
.me = THIS_MODULE,
.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)
.range_to_nlattr = nf_nat_proto_range_to_nlattr,
.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");
......@@ -51,7 +51,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
fl->fl4_dst = t->dst.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE)
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP)
fl->fl_ip_dport = t->dst.u.tcp.port;
}
......@@ -61,7 +62,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
fl->fl4_src = t->src.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE)
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP)
fl->fl_ip_sport = t->src.u.tcp.port;
}
}
......
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