diff options
| author | Ghanan Gowripalan <ghanan@google.com> | 2020-01-31 13:24:48 -0800 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-01-31 13:25:48 -0800 |
| commit | 528dd1ec72fee1dd63c734fe92d1b972b5735b8f (patch) | |
| tree | 157798c5fdae1e73cb5ec4e32e692161666a5cfa /pkg/tcpip/network/arp | |
| parent | bc3a24d62788bd6b881afeda230f1a5550a5709a (diff) | |
Extract multicast IP to Ethernet address mapping
Test: header.TestEthernetAddressFromMulticastIPAddress
PiperOrigin-RevId: 292604649
Diffstat (limited to 'pkg/tcpip/network/arp')
| -rw-r--r-- | pkg/tcpip/network/arp/arp.go | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go index 1ceaebfbd..4da13c5df 100644 --- a/pkg/tcpip/network/arp/arp.go +++ b/pkg/tcpip/network/arp/arp.go @@ -178,24 +178,9 @@ func (*protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bo return broadcastMAC, true } if header.IsV4MulticastAddress(addr) { - // RFC 1112 Host Extensions for IP Multicasting - // - // 6.4. Extensions to an Ethernet Local Network Module: - // - // An IP host group address is mapped to an Ethernet multicast - // address by placing the low-order 23-bits of the IP address - // into the low-order 23 bits of the Ethernet multicast address - // 01-00-5E-00-00-00 (hex). - return tcpip.LinkAddress([]byte{ - 0x01, - 0x00, - 0x5e, - addr[header.IPv4AddressSize-3] & 0x7f, - addr[header.IPv4AddressSize-2], - addr[header.IPv4AddressSize-1], - }), true + return header.EthernetAddressFromMulticastIPv4Address(addr), true } - return "", false + return tcpip.LinkAddress([]byte(nil)), false } // SetOption implements NetworkProtocol. |