1#!/usr/local/bin/python3
2
3print("send first ping6 fragment that ends behind ipv6 max packet size")
4
5# IPV6_MAXPACKET                                           |
6#                                                      |----|
7# |--------|
8#          |----|
9
10import os
11from addr import *
12from scapy.all import *
13
14pid=os.getpid()
15eid=pid & 0xffff
16payload=b"ABCDEFGHIJKLMNOP"
17packet=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/ \
18    ICMPv6EchoRequest(id=eid, data=payload)
19frag=[]
20fid=pid & 0xffffffff
21frag.append(IPv6ExtHdrFragment(nh=58, id=fid, offset=8191)/bytes(packet)[56:64])
22frag.append(IPv6ExtHdrFragment(nh=58, id=fid, m=1)/bytes(packet)[40:56])
23frag.append(IPv6ExtHdrFragment(nh=58, id=fid, offset=2)/bytes(packet)[56:64])
24eth=[]
25for f in frag:
26	pkt=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/f
27	eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/pkt)
28
29if os.fork() == 0:
30	time.sleep(1)
31	sendp(eth, iface=LOCAL_IF)
32	os._exit(0)
33
34ans=sniff(iface=LOCAL_IF, timeout=3, filter=
35    "ip6 and src "+REMOTE_ADDR6+" and dst "+LOCAL_ADDR6+" and icmp6")
36for a in ans:
37	if a and a.type == ETH_P_IPV6 and \
38	    ipv6nh[a.payload.nh] == 'ICMPv6' and \
39	    icmp6types[a.payload.payload.type] == 'Echo Reply':
40		id=a.payload.payload.id
41		print("id=%#x" % (id))
42		if id != eid:
43			print("WRONG ECHO REPLY ID")
44			exit(2)
45		data=a.payload.payload.data
46		print("payload=%s" % (data))
47		if data == payload:
48			exit(0)
49		print("PAYLOAD!=%s" % (payload))
50		exit(1)
51print("NO ECHO REPLY")
52exit(2)
53