Q: how to access IPv6 ext headers?

[hujun-open]

Hi,
since gopacket doesn't provide any IP fragmentation support, I want to write one, however after reading the layers.IPv6 doc, I can't figure out how gopacket handle the IPv6 ext headers, there is only a HopByHop field in the struct, how does user access other v6 ext header like routing header after using gopacket.NewPacket() ?

type IPv6 struct {
	// http://www.networksorcery.com/enp/protocol/ipv6.htm
	BaseLayer
	Version      uint8
	TrafficClass uint8
	FlowLabel    uint32
	Length       uint16
	NextHeader   IPProtocol
	HopLimit     uint8
	SrcIP        net.IP
	DstIP        net.IP
	HopByHop     *IPv6HopByHop
	// contains filtered or unexported fields
}