From 0bf43b758f650334652030cc8d73cc6dc10590ff Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Wed, 14 Feb 2018 11:39:55 +0000
Subject: [PATCH] Split create_icmpv6 into create_icmpv6_tun and
 create_icmpv6_tap

---
 src/yggdrasil/icmpv6.go | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/yggdrasil/icmpv6.go b/src/yggdrasil/icmpv6.go
index 5d014bdb..56d33437 100644
--- a/src/yggdrasil/icmpv6.go
+++ b/src/yggdrasil/icmpv6.go
@@ -129,7 +129,7 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
 			response, err := i.handle_ndp(datain[ipv6.HeaderLen:])
 			if err == nil {
 				// Create our ICMPv6 response
-				responsePacket, err := i.create_icmpv6(ipv6Header.Src, ipv6.ICMPTypeNeighborAdvertisement, 0, response)
+				responsePacket, err := i.create_icmpv6_tun(ipv6Header.Src, ipv6.ICMPTypeNeighborAdvertisement, 0, response)
 				if err != nil {
 					return nil, err
 				}
@@ -148,7 +148,27 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
 	return nil, nil
 }
 
-func (i *icmpv6) create_icmpv6(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
+func (i *icmpv6) create_icmpv6_tap(dstmac macAddress, dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
+	// Pass through to create_icmpv6_tun
+	ipv6packet, err := i.create_icmpv6_tun(dst, mtype, mcode, mbody)
+	if err != nil {
+		return nil, err
+	}
+
+        // Create the response buffer
+        dataout := make([]byte, ETHER+ipv6.HeaderLen+len(mbody))
+
+        // Populate the response ethernet headers
+        copy(dataout[:6], dstmac[:6])
+        copy(dataout[6:12], i.mymac[:])
+        binary.BigEndian.PutUint16(dataout[12:14], uint16(0x86DD))
+
+        // Copy the returned packet to our response ethernet frame
+        copy(dataout[ETHER:], ipv6packet)
+        return dataout, nil
+}
+
+func (i *icmpv6) create_icmpv6_tun(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
 	// Create the IPv6 header
 	ipv6Header := ipv6.Header{
 		Version:    ipv6.Version,
@@ -187,6 +207,8 @@ func (i *icmpv6) create_icmpv6(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody
 	return responsePacket, nil
 }
 
+
+
 func (i *icmpv6) handle_ndp(in []byte) ([]byte, error) {
 	// Ignore NDP requests for anything outside of fd00::/8
 	if in[8] != 0xFD {