func (p *Packet) Unpack(buf *packet.Buffer) error {
var versclass uint8
buf.ReadN(&versclass)
p.Version = versclass >> 4
p.Class =
uint8((binary.BigEndian.Uint16(buf.LayerBytes()[0:2]) >> 4) & 0x00FF)
p.Label =
binary.BigEndian.Uint32(buf.LayerBytes()[0:4]) & 0x000FFFFF
buf.Next(3)
buf.ReadN(&p.Length)
buf.ReadN(&p.NextHdr)
buf.ReadN(&p.HopLimit)
p.SrcAddr = net.IP(buf.Next(16))
p.DstAddr = net.IP(buf.Next(16))
/* TODO: Options */
return nil
}
func (p *Packet) Pack(buf *packet.Buffer) error {
buf.WriteN(byte(p.Type))
buf.WriteN(byte(p.Code))
buf.WriteN(uint16(0x00))
buf.WriteN(p.Body)
if p.csum_seed != 0 {
p.Checksum = ipv4.CalculateChecksum(buf.LayerBytes(), p.csum_seed)
buf.PutUint16N(2, p.Checksum)
}
return nil
}
func (p *Packet) Pack(buf *packet.Buffer) error {
buf.WriteN(p.SrcPort)
buf.WriteN(p.DstPort)
buf.WriteN(p.Length)
if p.csum_seed != 0 {
p.Checksum =
ipv4.CalculateChecksum(buf.LayerBytes(), p.csum_seed)
}
buf.WriteN(p.Checksum)
return nil
}
func (p *Packet) Pack(buf *packet.Buffer) error {
buf.WriteN((p.Version << 4) | p.IHL)
buf.WriteN(p.TOS)
buf.WriteN(p.Length)
buf.WriteN(p.Id)
buf.WriteN((uint16(p.Flags) << 13) | p.FragOff)
buf.WriteN(p.TTL)
buf.WriteN(p.Protocol)
buf.WriteN(uint16(0x00))
buf.Write(p.SrcAddr.To4())
buf.Write(p.DstAddr.To4())
p.checksum(buf.LayerBytes()[:20])
buf.PutUint16N(10, p.Checksum)
return nil
}
func (p *Packet) Pack(buf *packet.Buffer) error {
buf.WriteN(p.SrcPort)
buf.WriteN(p.DstPort)
buf.WriteN(p.Seq)
buf.WriteN(p.Ack)
flags := uint16(p.DataOff) << 12
if p.Flags&Fin != 0 {
flags |= 0x0001
}
if p.Flags&Syn != 0 {
flags |= 0x0002
}
if p.Flags&Rst != 0 {
flags |= 0x0004
}
if p.Flags&PSH != 0 {
flags |= 0x0008
}
if p.Flags&Ack != 0 {
flags |= 0x0010
}
if p.Flags&Urg != 0 {
flags |= 0x0020
}
if p.Flags&ECE != 0 {
flags |= 0x0040
}
if p.Flags&Cwr != 0 {
flags |= 0x0080
}
if p.Flags&NS != 0 {
flags |= 0x0100
}
buf.WriteN(flags)
buf.WriteN(p.WindowSize)
buf.WriteN(uint16(0x0000))
buf.WriteN(p.Urgent)
for _, opt := range p.Options {
buf.WriteN(opt.Type)
buf.WriteN(opt.Len)
buf.WriteN(opt.Data)
}
if p.csum_seed != 0 {
p.Checksum =
ipv4.CalculateChecksum(buf.LayerBytes(), p.csum_seed)
}
buf.PutUint16N(16, p.Checksum)
/* add padding */
for buf.LayerLen() < int(p.DataOff)*4 {
buf.WriteN(uint8(0x00))
}
return nil
}
func (p *Packet) Pack(buf *packet.Buffer) error {
buf.WriteN(byte(p.Type))
buf.WriteN(byte(p.Code))
buf.WriteN(uint16(0x0000))
buf.WriteN(p.Id)
buf.WriteN(p.Seq)
p.Checksum = ipv4.CalculateChecksum(buf.LayerBytes(), 0)
buf.PutUint16N(2, p.Checksum)
return nil
}