diff options
Diffstat (limited to 'pkg/tcpip/header/ipv4.go')
| -rw-r--r-- | pkg/tcpip/header/ipv4.go | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/pkg/tcpip/header/ipv4.go b/pkg/tcpip/header/ipv4.go index 950c54f74..29570cc34 100644 --- a/pkg/tcpip/header/ipv4.go +++ b/pkg/tcpip/header/ipv4.go @@ -93,6 +93,12 @@ const ( // IPv4Version is the version of the ipv4 protocol. IPv4Version = 4 + + // IPv4Broadcast is the broadcast address of the IPv4 procotol. + IPv4Broadcast tcpip.Address = "\xff\xff\xff\xff" + + // IPv4Any is the non-routable IPv4 "any" meta address. + IPv4Any tcpip.Address = "\x00\x00\x00\x00" ) // Flags that may be set in an IPv4 packet. @@ -259,3 +265,13 @@ func (b IPv4) IsValid(pktSize int) bool { return true } + +// IsV4MulticastAddress determines if the provided address is an IPv4 multicast +// address (range 224.0.0.0 to 239.255.255.255). The four most significant bits +// will be 1110 = 0xe0. +func IsV4MulticastAddress(addr tcpip.Address) bool { + if len(addr) != IPv4AddressSize { + return false + } + return (addr[0] & 0xf0) == 0xe0 +} |