[IPV6] MIP6: Add Mobility header definition.

Add Mobility header definition for Mobile IPv6.
Based on MIPL2 kernel patch.

This patch was also written by: Antti Tuominen <anttit@tcs.hut.fi>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/in6.h

@@ -134,6 +134,7 @@ struct in6_flowlabel_req
 #define IPPROTO_ICMPV6		58	/* ICMPv6			*/
 #define IPPROTO_NONE		59	/* IPv6 no next header		*/
 #define IPPROTO_DSTOPTS		60	/* IPv6 destination options	*/
+#define IPPROTO_MH		135	/* IPv6 mobility header		*/
 
 /*
  *	IPv6 TLV options.

include/net/flow.h

@@ -72,12 +72,21 @@ struct flowi {
 		} dnports;
 
 		__u32		spi;
+
+#ifdef CONFIG_IPV6_MIP6
+		struct {
+			__u8	type;
+		} mht;
+#endif
 	} uli_u;
 #define fl_ip_sport	uli_u.ports.sport
 #define fl_ip_dport	uli_u.ports.dport
 #define fl_icmp_type	uli_u.icmpt.type
 #define fl_icmp_code	uli_u.icmpt.code
 #define fl_ipsec_spi	uli_u.spi
+#ifdef CONFIG_IPV6_MIP6
+#define fl_mh_type	uli_u.mht.type
+#endif
 	__u32           secid;	/* used by xfrm; see secid.txt */
 } __attribute__((__aligned__(BITS_PER_LONG/8)));
 

include/net/ipv6.h

@@ -40,6 +40,7 @@
 #define NEXTHDR_ICMP		58	/* ICMP for IPv6. */
 #define NEXTHDR_NONE		59	/* No next header */
 #define NEXTHDR_DEST		60	/* Destination options header. */
+#define NEXTHDR_MOBILITY	135	/* Mobility header. */
 
 #define NEXTHDR_MAX		255
 

include/net/mip6.h

@@ -28,6 +28,29 @@
 #define MIP6_OPT_PAD_1	0
 #define MIP6_OPT_PAD_N	1
 
+/*
+ * Mobility Header
+ */
+struct ip6_mh {
+	__u8	ip6mh_proto;
+	__u8	ip6mh_hdrlen;
+	__u8	ip6mh_type;
+	__u8	ip6mh_reserved;
+	__u16	ip6mh_cksum;
+	/* Followed by type specific messages */
+	__u8	data[0];
+} __attribute__ ((__packed__));
+
+#define IP6_MH_TYPE_BRR		0   /* Binding Refresh Request */
+#define IP6_MH_TYPE_HOTI	1   /* HOTI Message   */
+#define IP6_MH_TYPE_COTI	2   /* COTI Message  */
+#define IP6_MH_TYPE_HOT		3   /* HOT Message   */
+#define IP6_MH_TYPE_COT		4   /* COT Message  */
+#define IP6_MH_TYPE_BU		5   /* Binding Update */
+#define IP6_MH_TYPE_BACK	6   /* Binding ACK */
+#define IP6_MH_TYPE_BERROR	7   /* Binding Error */
+#define IP6_MH_TYPE_MAX		IP6_MH_TYPE_BERROR
+
 extern int mip6_init(void);
 extern void mip6_fini(void);