[NETFILTER]: nf_conntrack: add DCCP protocol support

Add DCCP conntrack helper. Thanks to Gerrit Renker <gerrit@erg.abdn.ac.uk>
for review and testing.

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

4 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/netfilter/nf_conntrack_dccp.h b/include/linux/netfilter/nf_conntrack_dccp.h
new file mode 100644
index 00000000000..40dcc82058d
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_dccp.h
@@ -0,0 +1,40 @@
+#ifndef _NF_CONNTRACK_DCCP_H
+#define _NF_CONNTRACK_DCCP_H
+
+/* Exposed to userspace over nfnetlink */
+enum ct_dccp_states {
+        CT_DCCP_NONE,
+        CT_DCCP_REQUEST,
+        CT_DCCP_RESPOND,
+        CT_DCCP_PARTOPEN,
+        CT_DCCP_OPEN,
+        CT_DCCP_CLOSEREQ,
+        CT_DCCP_CLOSING,
+        CT_DCCP_TIMEWAIT,
+        CT_DCCP_IGNORE,
+        CT_DCCP_INVALID,
+        __CT_DCCP_MAX
+};
+#define CT_DCCP_MAX             (__CT_DCCP_MAX - 1)
+
+enum ct_dccp_roles {
+        CT_DCCP_ROLE_CLIENT,
+        CT_DCCP_ROLE_SERVER,
+        __CT_DCCP_ROLE_MAX
+};
+#define CT_DCCP_ROLE_MAX        (__CT_DCCP_ROLE_MAX - 1)
+
+#ifdef __KERNEL__
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+struct nf_ct_dccp {
+        u_int8_t        role[IP_CT_DIR_MAX];
+        u_int8_t        state;
+        u_int8_t        last_pkt;
+        u_int8_t        last_dir;
+        u_int64_t       handshake_seq;
+};
+
+#endif /* __KERNEL__ */
+
+#endif /* _NF_CONNTRACK_DCCP_H */
diff --git a/include/linux/netfilter/nfnetlink_conntrack.h b/include/linux/netfilter/nfnetlink_conntrack.h
index e3e1533aba2..0a383ac083c 100644
--- a/include/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/linux/netfilter/nfnetlink_conntrack.h
@@ -80,6 +80,7 @@ enum ctattr_l4proto {
 enum ctattr_protoinfo {
         CTA_PROTOINFO_UNSPEC,
         CTA_PROTOINFO_TCP,
+        CTA_PROTOINFO_DCCP,
         __CTA_PROTOINFO_MAX
 };
 #define CTA_PROTOINFO_MAX (__CTA_PROTOINFO_MAX - 1)
@@ -95,6 +96,13 @@ enum ctattr_protoinfo_tcp {
 };
 #define CTA_PROTOINFO_TCP_MAX (__CTA_PROTOINFO_TCP_MAX - 1)
 
+enum ctattr_protoinfo_dccp {
+        CTA_PROTOINFO_DCCP_UNSPEC,
+        CTA_PROTOINFO_DCCP_STATE,
+        __CTA_PROTOINFO_DCCP_MAX,
+};
+#define CTA_PROTOINFO_DCCP_MAX (__CTA_PROTOINFO_DCCP_MAX - 1)
+
 enum ctattr_counters {
         CTA_COUNTERS_UNSPEC,
         CTA_COUNTERS_PACKETS,           /* old 64bit counters */
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index a3567a7a6d6..bb9fc852e97 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -20,6 +20,7 @@
 #include <asm/atomic.h>
 
 #include <linux/netfilter/nf_conntrack_tcp.h>
+#include <linux/netfilter/nf_conntrack_dccp.h>
 #include <linux/netfilter/nf_conntrack_sctp.h>
 #include <linux/netfilter/nf_conntrack_proto_gre.h>
 #include <net/netfilter/ipv4/nf_conntrack_icmp.h>
@@ -30,6 +31,7 @@
 /* per conntrack: protocol private data */
 union nf_conntrack_proto {
         /* insert conntrack proto private data here */
+        struct nf_ct_dccp dccp;
         struct ip_ct_sctp sctp;
         struct ip_ct_tcp tcp;
         struct ip_ct_icmp icmp;
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h
index 168c91754d8..bdeec346138 100644
--- a/include/net/netfilter/nf_conntrack_tuple.h
+++ b/include/net/netfilter/nf_conntrack_tuple.h
@@ -41,6 +41,9 @@ union nf_conntrack_man_proto
         } icmp;
         struct {
                 __be16 port;
+        } dccp;
+        struct {
+                __be16 port;
         } sctp;
         struct {
                 __be16 key;     /* GRE key is 32bit, PPtP only uses 16bit */
@@ -79,6 +82,9 @@ struct nf_conntrack_tuple
                         } icmp;
                         struct {
                                 __be16 port;
+                        } dccp;
+                        struct {
+                                __be16 port;
                         } sctp;
                         struct {
                                 __be16 key;