icmpv6_echo/README.md

# Build IPv6 ICMP ECHO packet with Ethernet headers

Simple C code that builds a valid (ish) ethernet icmpv6 echo packet. 

* https://en.wikipedia.org/wiki/Ethernet_frame
* https://en.wikipedia.org/wiki/IPv6_packet
* https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol_for_IPv6
* https://www.pdbuchan.com/rawsock/icmp6_cooked.c
* https://stackoverflow.com/a/14937171
* https://github.com/secdev/scapy/blob/a1f999fb1721a64415af75d575cabde19625a6f5/scapy/utils.py#L493-L501
* https://github.com/secdev/scapy/blob/a1f999fb1721a64415af75d575cabde19625a6f5/scapy/layers/inet6.py#L608-L624

## Scapy code samples
Writen in `scapy` shell

```python
# import hex as packet
e = Ether(bytes.fromhex('fc de ad be ef 05 fc de ad be ef 56 86 dd 60 00 00 00 00 08 3a 02 fe 80 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fe 80 00 00 00 00 00 00 50 5d 18 fb 5e 52 ec c0 81 00 4e cd 00 00 00 00 ef be ad de'))
e.show()

# Write packet as pcap to open in Wireshark
wrpcap("test.pcap", e)

# Calculate icmpv6 checksum
i = e[IPv6][ICMPv6EchoReply]
i.cksum = 0
r = raw(i)
print(hex(in6_chksum(socket.IPPROTO_ICMPV6, e[IPv6], r)))
```