IPv6 comes with a new version of ICMP: ICMPv6 (yes!).
ICMPv6 has the same header than ICMP, but type and code have different meanings. And ICMPv6 has not the same protocol number than ICMP.
In fact, ICMPv6 supports much more features than ICMP, but at packet level, there is no such differences.
pg> pkt = PacketGen.gen('IPv6', src: '::1', dst: '::1')
pg> pkt.add('ICMPv6', type: 128, code: 0, body: 'ping')
pg> pkt.calc
pg> pkt
=> -- PacketGen::Packet -------------------------------------------------
---- PacketGen::Header::IPv6 -----------------------------------------
Int32 u32: 1610612736 (0x60000000)
version: 6
tclass: 0 (0x00)
flow_label: 0 (0x00000)
Int16 length: 8 (0x0008)
Int8 next: 58 (0x3a)
Int8 hop: 64 (0x40)
Addr src: ::1
Addr dst: ::1
---- PacketGen::Header::ICMPv6 ---------------------------------------
Int8 type: 128 (0x80)
Int8 code: 0 (0x00)
Int16 checksum: 41194 (0xa0ea)
---- Body ------------------------------------------------------------
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
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70 69 6e 67 ping
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