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Fix IP classification for LAN multicast

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This commit is contained in:
Daniel
2020-04-30 14:16:06 +02:00
parent 0cf10b6d9d
commit b91b8fcdc9
1 changed files with 11 additions and 4 deletions
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15
network/netutils/ip.go
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@@ -14,7 +14,7 @@ const (
) )
// ClassifyIP returns the classification for the given IP address. // ClassifyIP returns the classification for the given IP address.
func ClassifyIP(ip net.IP) int8 { func ClassifyIP(ip net.IP) int8 { //nolint:gocognit
if ip4 := ip.To4(); ip4 != nil { if ip4 := ip.To4(); ip4 != nil {
// IPv4 // IPv4
switch { switch {
@@ -36,11 +36,18 @@ func ClassifyIP(ip net.IP) int8 {
case ip4[0] == 224: case ip4[0] == 224:
// 224.0.0.0/8 // 224.0.0.0/8
return LocalMulticast return LocalMulticast
case ip4[0] >= 225 && ip4[0] <= 239: case ip4[0] >= 225 && ip4[0] <= 238:
// 225.0.0.0/8 - 239.0.0.0/8 // 225.0.0.0/8 - 238.0.0.0/8
return GlobalMulticast return GlobalMulticast
case ip4[0] == 239:
// 239.0.0.0/8
// RFC2365 - https://tools.ietf.org/html/rfc2365
return LocalMulticast
case ip4[0] == 255 && ip4[1] == 255 && ip4[2] == 255 && ip4[3] == 255:
// 255.255.255.255/32
return LocalMulticast
case ip4[0] >= 240: case ip4[0] >= 240:
// 240.0.0.0/8 - 255.0.0.0/8 // 240.0.0.0/8 - 255.0.0.0/8 (minus 255.255.255.255/32)
return Invalid return Invalid
default: default:
return Global return Global