diff options
Diffstat (limited to 'pkg/tcpip/network/arp')
| -rw-r--r-- | pkg/tcpip/network/arp/arp.go | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go index 2e0024925..ed39640c1 100644 --- a/pkg/tcpip/network/arp/arp.go +++ b/pkg/tcpip/network/arp/arp.go @@ -160,9 +160,27 @@ func (*protocol) LinkAddressRequest(addr, localAddr tcpip.Address, linkEP stack. // ResolveStaticAddress implements stack.LinkAddressResolver. func (*protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) { - if addr == "\xff\xff\xff\xff" { + if addr == header.IPv4Broadcast { 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 "", false } |