[NETFILTER]: nf_nat: add DCCP protocol support

Signed-off-by: Patrick McHardy <kaber@trash.net>

4 files changed, 118 insertions, 2 deletions

diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index c5bd2840663b..fde3eacd196d 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 332f46fbc756..74d8dbdc1120 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 000000000000..12b51b38442e
--- /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@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");
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index dc316b9f9b1d..b759ffa1098d 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;
         }
 }