def generate(self, ip_dst=None, eth_dst=None):
"""Generates a Neighbor Solicitation (NS) packet (ICMP over IPv6).
Args:
ip_dst: NS ipv6 destination (Optional)
eth_dst: Ethernet (layer 2) destination address (Optional)
"""
# Compute IP addresses
target_ip6 = ip_dst if ip_dst is not None else self.dst_ipv6
ndst_ip = socket.inet_pton(socket.AF_INET6, target_ip6)
nnode_mcast = scapy.in6_getnsma(ndst_ip)
node_mcast = socket.inet_ntop(socket.AF_INET6, nnode_mcast)
# Compute MAC addresses
hw_dst = (eth_dst
if eth_dst is not None else scapy.in6_getnsmac(nnode_mcast))
# Create IPv6 layer
base = scapy.IPv6(dst=node_mcast, src=self.src_ipv6)
neighbor_solicitation = scapy.ICMPv6ND_NS(tgt=target_ip6)
src_ll_addr = scapy.ICMPv6NDOptSrcLLAddr(lladdr=self.src_mac)
ip6 = base / neighbor_solicitation / src_ll_addr
# Create Ethernet layer
ethernet = scapy.Ether(src=self.src_mac, dst=hw_dst)
self.packet = ethernet / ip6
return self.packet
def NS(srcaddr, tgtaddr, srcmac):
solicited = inet_pton(AF_INET6, tgtaddr)
last3bytes = tuple([ord(b) for b in solicited[-3:]])
solicited = "ff02::1:ff%02x:%02x%02x" % last3bytes
packet = (scapy.IPv6(src=srcaddr, dst=solicited) /
scapy.ICMPv6ND_NS(tgt=tgtaddr) /
scapy.ICMPv6NDOptSrcLLAddr(lladdr=srcmac))
return ("ICMPv6 NS", packet)
def ExpectUnicastProbe(self, addr):
version = 6 if ":" in addr else 4
if version == 6:
expected = (
scapy.IPv6(src=self.MyLinkLocalAddress(self.netid), dst=addr) /
scapy.ICMPv6ND_NS(tgt=addr) / scapy.ICMPv6NDOptSrcLLAddr(
lladdr=self.MyMacAddress(self.netid)))
self.ExpectPacketOn(self.netid, "Unicast probe", expected)
else:
raise NotImplementedError
def create_ns(dst_ip, dst_mac, src_ip=None, src_mac=None, tgt_ip=None):
# Solicitation
if src_ip is None:
src_ip = mac2ipv6(router_mac)
if src_mac is None:
src_mac = router_mac
if tgt_ip is None:
tgt_ip = dst_ip
ether_head = scapy.Ether(dst=dst_mac, src=src_mac)
# With solicited node multicast
ipv6_head = scapy.IPv6(src=src_ip, dst=make_sn_mc(dst_ip))
icmpv6_ns = scapy.ICMPv6ND_NS(tgt=tgt_ip)
icmpv6_opt_pref = scapy.ICMPv6NDOptSrcLLAddr(lladdr=src_mac)
sol = (ether_head / ipv6_head / icmpv6_ns / icmpv6_opt_pref)
return sol
def ExpectProbe(self, is_unicast, addr):
version = 6 if ":" in addr else 4
if version == 6:
llsrc = self.MyMacAddress(self.netid)
if is_unicast:
src = self.MyLinkLocalAddress(self.netid)
dst = addr
else:
solicited = inet_pton(AF_INET6, addr)
last3bytes = tuple([ord(b) for b in solicited[-3:]])
dst = "ff02::1:ff%02x:%02x%02x" % last3bytes
src = self.MyAddress(6, self.netid)
expected = (scapy.IPv6(src=src, dst=dst) /
scapy.ICMPv6ND_NS(tgt=addr) /
scapy.ICMPv6NDOptSrcLLAddr(lladdr=llsrc))
msg = "%s probe" % ("Unicast" if is_unicast else "Multicast")
self.ExpectPacketOn(self.netid, msg, expected)
else:
raise NotImplementedError