protocol

type ARP struct {
	HWType      uint16
	ProtoType   uint16
	HWLength    uint8
	ProtoLength uint8
	Operation   uint16
	SHA         net.HardwareAddr // Sender Hardware Address
	SPA         net.IP           // Sender Protocol Address
	THA         net.HardwareAddr // Target Hardware Address
	TPA         net.IP           // Target Protocol Address
}

type DHCP struct {
	Op      DHCPOpcode // Message op code / message type.
	Hops    uint8
	XID     uint32        // Transaction ID.
	Elapsed time.Duration // Elapsed since client began address acquisition or renewal process.
	Flags   uint16
	CIAddr  net.IP           // Client IP address.
	YIAddr  net.IP           // Your (client) IP address.
	SIAddr  net.IP           // IP address of next server to use in bootstrap.
	GIAddr  net.IP           // Relay agent IP address, used in booting via a relay agent.
	CHAddr  net.HardwareAddr // Client hardware address.
	SName   string           // Optional server host name.
	File    string           // Boot file name.
	Options []DHCPOption     // Optional parameters field.
	// contains filtered or unexported fields
}

type DHCPOpcode uint8

type DHCPOption struct {
	Code  uint8
	Value []byte
}

type Ethernet struct {
	SrcMAC, DstMAC net.HardwareAddr
	Type           uint16
	Payload        []byte
}

type ICMP struct {
	Type     uint8
	Code     uint8
	Checksum uint16
}

type ICMPEcho struct {
	ICMP
	ID       uint16
	Sequence uint16
	Payload  []byte
}

type IPv4 struct {
	Version  uint8
	IHL      uint8
	DSCP     uint8
	ECN      uint8
	Length   uint16
	ID       uint16
	Flags    uint8
	Offset   uint16
	TTL      uint8
	Protocol uint8
	Checksum uint16
	SrcIP    net.IP
	DstIP    net.IP
	Payload  []byte
}

type LLDP struct {
	ChassisID LLDPChassisID
	PortID    LLDPPortID
	TTL       uint16
}

type LLDPChassisID struct {
	SubType uint8
	Data    []byte
}

type LLDPPortID struct {
	SubType uint8
	Data    []byte
}

type TCP struct {
	SrcPort        uint16
	DstPort        uint16
	Sequence       uint32
	Acknowledgment uint32
	// From LSB, FIN, SYN, RST, PSH, ACK, URG, ECE, CWR, and NS.
	Flags      uint16
	WindowSize uint16
	Checksum   uint16
	Urgent     uint16
	Payload    []byte
	// contains filtered or unexported fields
}

type UDP struct {
	SrcPort  uint16
	DstPort  uint16
	Length   uint16
	Checksum uint16
	Payload  []byte
	// contains filtered or unexported fields
}