[NETFILTER]: nf_nat: add UDP-Lite support
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
commit 3eee75c01a5589393289a81daf19215a45f802b9
tree f48fae969c0ad8606df2ac17312e94b03fe2e457
parent 0caae257342d590b5dbe846fdb4519286f94bd78
author Patrick McHardy <kaber@xxxxxxxxx> Thu, 20 Mar 2008 15:15:51 +0100
committer Patrick McHardy <kaber@xxxxxxxxx> Mon, 14 Apr 2008 12:10:51 +0200
net/ipv4/netfilter/Kconfig | 5 +
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_proto_udplite.c | 99 +++++++++++++++++++++++++++++
net/ipv4/netfilter/nf_nat_standalone.c | 6 +-
4 files changed, 109 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 9a077cb..c5bd284 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -245,6 +245,11 @@ config NF_NAT_PROTO_GRE
tristate
depends on NF_NAT && NF_CT_PROTO_GRE
+config NF_NAT_PROTO_UDPLITE
+ tristate
+ depends on NF_NAT && NF_CT_PROTO_UDPLITE
+ default NF_NAT && NF_CT_PROTO_UDPLITE
+
config NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index e73d0eb..332f46f 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
+obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_nat_proto_udplite.c b/net/ipv4/netfilter/nf_nat_proto_udplite.c
new file mode 100644
index 0000000..b29346d
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_udplite.c
@@ -0,0 +1,99 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@xxxxxxxxxxxxx>
+ * (C) 2008 Patrick McHardy <kaber@xxxxxxxxx>
+ *
+ * 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/init.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_protocol.h>
+
+static u_int16_t udplite_port_rover;
+
+static int
+udplite_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,
+ &udplite_port_rover);
+}
+
+static int
+udplite_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 = (struct iphdr *)(skb->data + iphdroff);
+ struct udphdr *hdr;
+ unsigned int hdroff = iphdroff + iph->ihl*4;
+ __be32 oldip, newip;
+ __be16 *portptr, newport;
+
+ if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
+ return 0;
+
+ iph = (struct iphdr *)(skb->data + iphdroff);
+ hdr = (struct udphdr *)(skb->data + hdroff);
+
+ if (maniptype == IP_NAT_MANIP_SRC) {
+ /* Get rid of src ip and src pt */
+ oldip = iph->saddr;
+ newip = tuple->src.u3.ip;
+ newport = tuple->src.u.udp.port;
+ portptr = &hdr->source;
+ } else {
+ /* Get rid of dst ip and dst pt */
+ oldip = iph->daddr;
+ newip = tuple->dst.u3.ip;
+ newport = tuple->dst.u.udp.port;
+ portptr = &hdr->dest;
+ }
+
+ inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
+ inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, 0);
+ if (!hdr->check)
+ hdr->check = CSUM_MANGLED_0;
+
+ *portptr = newport;
+ return 1;
+}
+
+static const struct nf_nat_protocol nf_nat_protocol_udplite = {
+ .protonum = IPPROTO_UDPLITE,
+ .me = THIS_MODULE,
+ .manip_pkt = udplite_manip_pkt,
+ .in_range = nf_nat_proto_in_range,
+ .unique_tuple = udplite_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_udplite_init(void)
+{
+ return nf_nat_protocol_register(&nf_nat_protocol_udplite);
+}
+
+static void __exit nf_nat_proto_udplite_fini(void)
+{
+ nf_nat_protocol_unregister(&nf_nat_protocol_udplite);
+}
+
+module_init(nf_nat_proto_udplite_init);
+module_exit(nf_nat_proto_udplite_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("UDP-Lite NAT protocol helper");
+MODULE_AUTHOR("Patrick McHardy <kaber@xxxxxxxxx>");
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index 9fba42d..dc316b9 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -50,7 +50,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
if (ct->status & statusbit) {
fl->fl4_dst = t->dst.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE)
fl->fl_ip_dport = t->dst.u.tcp.port;
}
@@ -59,7 +60,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
if (ct->status & statusbit) {
fl->fl4_src = t->src.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE)
fl->fl_ip_sport = t->src.u.tcp.port;
}
}
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