soypat/lneto
1
0
Fork 0
mirror of https://github.com/soypat/lneto.git synced 2026-08-21 06:59:04 +00:00
Code Issues Packages Projects Releases 1 Wiki Activity

mdns+xnet: add test that replicates issue in cyw43439

Browse Source
This commit is contained in:
Patricio Whittingslow
2026-03-26 17:41:27 -03:00
parent c06a4fa99b
commit 33f492557a
4 changed files with 188 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ethernet/definitions.go
+22
View File
@@ -33,6 +33,28 @@ func BroadcastAddr() [6]byte {
return [6]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
}
// IPv4MulticastToMAC maps an IPv4 multicast address to the corresponding
// Ethernet multicast MAC address.
//
// If ip is not in the IPv4 multicast range (224.0.0.0/4), ok is false and
// mac is zero.
func MulticastAddrFrom4(ip [4]byte) (mac [6]byte, ok bool) {
if ip[0]&0xf0 != 0xe0 {
return mac, false
}
mac[0] = 0x01
mac[1] = 0x00
mac[2] = 0x5e
// Lower 23 bits of IP
mac[3] = ip[1] & 0x7f // drop top bit
mac[4] = ip[2]
mac[5] = ip[3]
return mac, true
}
//go:generate stringer -type=Type -linecomment -output stringers.go .
type Type uint16