[NETFILTER]: nf_nat: add DCCP protocol support
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
commit 657f0294023ce9bfb5e2cca56ccaa64197414665
tree f29f26e9bf57d872316b733bca61ec3472185318
parent c079ea10a3255bda269c0d1696805979b207318e
author Patrick McHardy <kaber@xxxxxxxxx> Thu, 20 Mar 2008 15:15:57 +0100
committer Patrick McHardy <kaber@xxxxxxxxx> Mon, 14 Apr 2008 12:10:52 +0200
net/ipv4/netfilter/Kconfig | 5 +
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_proto_dccp.c | 108 ++++++++++++++++++++++++++++++++
net/ipv4/netfilter/nf_nat_standalone.c | 6 +-
4 files changed, 118 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index c5bd284..fde3eac 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -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
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 332f46f..74d8dbd 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -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
diff --git a/net/ipv4/netfilter/nf_nat_proto_dccp.c b/net/ipv4/netfilter/nf_nat_proto_dccp.c
new file mode 100644
index 0000000..12b51b3
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_dccp.c
@@ -0,0 +1,108 @@
+/*
+ * DCCP NAT protocol helper
+ *
+ * Copyright (c) 2005, 2006. 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/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@xxxxxxxxx>");
+MODULE_DESCRIPTION("DCCP NAT protocol helper");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index dc316b9..b759ffa 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -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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