From 528dd1ec72fee1dd63c734fe92d1b972b5735b8f Mon Sep 17 00:00:00 2001
From: Ghanan Gowripalan <ghanan@google.com>
Date: Fri, 31 Jan 2020 13:24:48 -0800
Subject: Extract multicast IP to Ethernet address mapping

Test: header.TestEthernetAddressFromMulticastIPAddress
PiperOrigin-RevId: 292604649
---
 pkg/tcpip/network/ipv6/icmp.go | 20 ++------------------
 1 file changed, 2 insertions(+), 18 deletions(-)

(limited to 'pkg/tcpip/network/ipv6')

diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index dc20c0fd7..7491cfc41 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -441,23 +441,7 @@ func (*protocol) LinkAddressRequest(addr, localAddr tcpip.Address, linkEP stack.
 // ResolveStaticAddress implements stack.LinkAddressResolver.
 func (*protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) {
 	if header.IsV6MulticastAddress(addr) {
-		// RFC 2464 Transmission of IPv6 Packets over Ethernet Networks
-		//
-		// 7. Address Mapping -- Multicast
-		//
-		// An IPv6 packet with a multicast destination address DST,
-		// consisting of the sixteen octets DST[1] through DST[16], is
-		// transmitted to the Ethernet multicast address whose first
-		// two octets are the value 3333 hexadecimal and whose last
-		// four octets are the last four octets of DST.
-		return tcpip.LinkAddress([]byte{
-			0x33,
-			0x33,
-			addr[header.IPv6AddressSize-4],
-			addr[header.IPv6AddressSize-3],
-			addr[header.IPv6AddressSize-2],
-			addr[header.IPv6AddressSize-1],
-		}), true
+		return header.EthernetAddressFromMulticastIPv6Address(addr), true
 	}
-	return "", false
+	return tcpip.LinkAddress([]byte(nil)), false
 }
-- 
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