1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
3 * (C) 2008 Patrick McHardy <kaber@trash.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/types.h>
11 #include <linux/udp.h>
13 #include <linux/netfilter.h>
14 #include <net/netfilter/nf_nat.h>
15 #include <net/netfilter/nf_nat_l3proto.h>
16 #include <net/netfilter/nf_nat_l4proto.h>
18 static u16 udplite_port_rover
;
21 udplite_unique_tuple(const struct nf_nat_l3proto
*l3proto
,
22 struct nf_conntrack_tuple
*tuple
,
23 const struct nf_nat_range
*range
,
24 enum nf_nat_manip_type maniptype
,
25 const struct nf_conn
*ct
)
27 nf_nat_l4proto_unique_tuple(l3proto
, tuple
, range
, maniptype
, ct
,
32 udplite_manip_pkt(struct sk_buff
*skb
,
33 const struct nf_nat_l3proto
*l3proto
,
34 unsigned int iphdroff
, unsigned int hdroff
,
35 const struct nf_conntrack_tuple
*tuple
,
36 enum nf_nat_manip_type maniptype
)
39 __be16
*portptr
, newport
;
41 if (!skb_make_writable(skb
, hdroff
+ sizeof(*hdr
)))
44 hdr
= (struct udphdr
*)(skb
->data
+ hdroff
);
46 if (maniptype
== NF_NAT_MANIP_SRC
) {
47 /* Get rid of source port */
48 newport
= tuple
->src
.u
.udp
.port
;
49 portptr
= &hdr
->source
;
51 /* Get rid of dst port */
52 newport
= tuple
->dst
.u
.udp
.port
;
56 l3proto
->csum_update(skb
, iphdroff
, &hdr
->check
, tuple
, maniptype
);
57 inet_proto_csum_replace2(&hdr
->check
, skb
, *portptr
, newport
, false);
59 hdr
->check
= CSUM_MANGLED_0
;
65 const struct nf_nat_l4proto nf_nat_l4proto_udplite
= {
66 .l4proto
= IPPROTO_UDPLITE
,
67 .manip_pkt
= udplite_manip_pkt
,
68 .in_range
= nf_nat_l4proto_in_range
,
69 .unique_tuple
= udplite_unique_tuple
,
70 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
71 .nlattr_to_range
= nf_nat_l4proto_nlattr_to_range
,