[IPV6] MIP6: Transformation support mobility header.

Transformation support mobility header.
Based on MIPL2 kernel patch.
Signed-off-by: NMasahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -546,6 +546,11 @@ u16 xfrm_flowi_sport(struct flowi *fl)
 	case IPPROTO_ICMPV6:
 		port = htons(fl->fl_icmp_type);
 		break;
+#ifdef CONFIG_IPV6_MIP6
+	case IPPROTO_MH:
+		port = htons(fl->fl_mh_type);
+		break;
+#endif
 	default:
 		port = 0;	/*XXX*/
 	}

net/ipv6/xfrm6_policy.c

@@ -18,6 +18,9 @@
 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/ip6_route.h>
+#ifdef CONFIG_IPV6_MIP6
+#include <net/mip6.h>
+#endif
 
 static struct dst_ops xfrm6_dst_ops;
 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
@@ -270,6 +273,18 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 			fl->proto = nexthdr;
 			return;
 
+#ifdef CONFIG_IPV6_MIP6
+		case IPPROTO_MH:
+			if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) {
+				struct ip6_mh *mh;
+				mh = (struct ip6_mh *)exthdr;
+
+				fl->fl_mh_type = mh->ip6mh_type;
+			}
+			fl->proto = nexthdr;
+			return;
+#endif
+
 		/* XXX Why are there these headers? */
 		case IPPROTO_AH:
 		case IPPROTO_ESP: