def ICMPPortUnreachable(version, srcaddr, dstaddr, packet):
if version == 4:
# Linux hardcodes the ToS on ICMP errors to 0xc0 or greater because of
# RFC 1812 4.3.2.5 (!).
return ("ICMPv4 port unreachable",
scapy.IP(src=srcaddr, dst=dstaddr, proto=1, tos=0xc0) /
scapy.ICMPerror(type=3, code=3) / packet)
else:
return ("ICMPv6 port unreachable",
scapy.IPv6(src=srcaddr, dst=dstaddr) /
scapy.ICMPv6DestUnreach(code=4) / packet)
def get_icmp_unreachable_pkt(pkt):
p = None
icmp = None
if pkt.ipv4:
p = sp.IP(dst=pkt.src_addr, src=pkt.dst_addr)
icmp = sp.ICMP()
# ICMP type=3 code=3 port Unreachable
icmp.type = 3
icmp.code = 3
else:
p = sp.IPv6(dst=pkt.src_addr, src=pkt.dst_addr)
icmp = sp.ICMPv6DestUnreach()
# ICMP type=1 code=4 port Unreachable
icmp.type = 1
icmp.code = 4
if pkt.ip.packet_len >= 64:
return p / icmp / (bytes(pkt.raw)[0:64])
else:
return p / icmp / (bytes(pkt.raw))
def GetIPv6Unreachable(port):
return (scapy.IPv6(src="::1", dst="::1") /
scapy.ICMPv6DestUnreach() /
scapy.IPv6(src="::1", dst="::1") /
scapy.ICMPv6EchoRequest(id=port, seq=1, data="foobarbaz"))