diff options
Diffstat (limited to 'pkg/tcpip/stack/nic.go')
| -rw-r--r-- | pkg/tcpip/stack/nic.go | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go index ae4d241de..eaaf756cd 100644 --- a/pkg/tcpip/stack/nic.go +++ b/pkg/tcpip/stack/nic.go @@ -217,6 +217,11 @@ func (n *NIC) disableLocked() *tcpip.Error { } if _, ok := n.stack.networkProtocols[header.IPv4ProtocolNumber]; ok { + // The NIC may have already left the multicast group. + if err := n.leaveGroupLocked(header.IPv4AllSystems, false /* force */); err != nil && err != tcpip.ErrBadLocalAddress { + return err + } + // The address may have already been removed. if err := n.removePermanentAddressLocked(ipv4BroadcastAddr.AddressWithPrefix.Address); err != nil && err != tcpip.ErrBadLocalAddress { return err @@ -255,6 +260,13 @@ func (n *NIC) enable() *tcpip.Error { if _, err := n.addAddressLocked(ipv4BroadcastAddr, NeverPrimaryEndpoint, permanent, static, false /* deprecated */); err != nil { return err } + + // As per RFC 1122 section 3.3.7, all hosts should join the all-hosts + // multicast group. Note, the IANA calls the all-hosts multicast group the + // all-systems multicast group. + if err := n.joinGroupLocked(header.IPv4ProtocolNumber, header.IPv4AllSystems); err != nil { + return err + } } // Join the IPv6 All-Nodes Multicast group if the stack is configured to |