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Add support for individual multicast address RX without promiscuous mode #2

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6 changes: 6 additions & 0 deletions packet.go
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,12 @@ func (c *Conn) SetPromiscuous(enable bool) error {
return c.setPromiscuous(enable)
}

// SetPromiscuous enables or disables promiscuous mode on the Conn, allowing it
// to receive traffic that is not addressed to the Conn's network interface.
func (c *Conn) SetMembership(enable bool, Type uint16, addr net.HardwareAddr) error {
return c.setMembership(enable, Type, addr)
}

// Stats contains statistics about a Conn reported by the Linux kernel.
type Stats struct {
// The total number of packets received.
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13 changes: 12 additions & 1 deletion packet_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,20 @@ func (c *Conn) writeTo(b []byte, addr net.Addr) (int, error) {

// setPromiscuous wraps setsockopt(2) for the unix.PACKET_MR_PROMISC option.
func (c *Conn) setPromiscuous(enable bool) error {
return c.setMembership(enable, unix.PACKET_MR_PROMISC, nil)
}

const ETH_ALEN uint16 = 6

// setMembership wraps setsockopt(2) for PACKET_MR_*
func (c *Conn) setMembership(enable bool, Type uint16, addr net.HardwareAddr) error {
mreq := unix.PacketMreq{
Ifindex: int32(c.ifIndex),
Type: unix.PACKET_MR_PROMISC,
Type: Type,
Alen: ETH_ALEN,
}
if Type == unix.PACKET_MR_MULTICAST {
copy(mreq.Address[:], addr)
}

membership := unix.PACKET_DROP_MEMBERSHIP
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