def perform_ipv6_nd_dad(self, ipv6_unicast_candidate):
""" Perform IPv6 ND Duplicate Address Detection, return True if passed """
self.logger.debug(f"ICMPv6 ND DAD - Starting process for {ipv6_unicast_candidate}")
self.assign_ipv6_multicast(ipv6_solicited_node_multicast(ipv6_unicast_candidate))
self.ipv6_unicast_candidate = ipv6_unicast_candidate
self.send_icmpv6_nd_dad_message(ipv6_unicast_candidate)
if event := self.event_icmpv6_nd_dad.acquire(timeout=1):
self.logger.warning(f"ICMPv6 ND DAD - Duplicate IPv6 address detected, {ipv6_unicast_candidate} advertised by {self.icmpv6_nd_dad_tlla}")
def __send_icmpv6_neighbor_solicitation(icmpv6_ns_target_address):
""" Enqueue ICMPv6 Neighbor Solicitation packet with TX ring """
stack.packet_handler.phtx_icmpv6(
ipv6_src=IPv6Address(
stack.packet_handler.stack_ipv6_unicast[0] if stack.
packet_handler.stack_ipv6_unicast else "::"),
ipv6_dst=ipv6_solicited_node_multicast(icmpv6_ns_target_address),
ipv6_hop=255,
icmpv6_type=ps_icmpv6.ICMP6_NEIGHBOR_SOLICITATION,
icmpv6_ns_target_address=icmpv6_ns_target_address,
)
def send_icmpv6_nd_dad_message(self, ipv6_unicast_candidate):
""" Send out ICMPv6 ND Duplicate Address Detection message """
self.phtx_icmpv6(
ipv6_src=IPv6Address("::"),
ipv6_dst=ipv6_solicited_node_multicast(ipv6_unicast_candidate),
ipv6_hop=255,
icmpv6_type=ps_icmpv6.ICMP6_NEIGHBOR_SOLICITATION,
icmpv6_ns_target_address=ipv6_unicast_candidate,
)
self.logger.debug(f"Sent out ICMPv6 ND DAD message for {ipv6_unicast_candidate}")
def remove_ipv6_unicast(self, ipv6_unicast):
""" Remove IPv6 unicast address from the list stack listens on """
self.stack_ipv6_unicast.remove(ipv6_unicast)
self.logger.debug(f"Removed IPv6 unicast {ipv6_unicast}")
self.remove_ipv6_multicast(ipv6_solicited_node_multicast(ipv6_unicast))
def assign_ipv6_unicast(self, ipv6_unicast):
""" Assign IPv6 unicast address to the list stack listens on """
self.stack_ipv6_unicast.append(ipv6_unicast)
self.logger.debug(f"Assigned IPv6 unicast {ipv6_unicast}")
self.assign_ipv6_multicast(ipv6_solicited_node_multicast(ipv6_unicast))
while True:
self.phrx_ether(stack.rx_ring.dequeue())
def perform_ipv6_nd_dad(self, ipv6_unicast_candidate):
""" Perform IPv6 ND Duplicate Address Detection, return True if passed """
self.logger.debug(f"ICMPv6 ND DAD - Starting process for {ipv6_unicast_candidate}")
self.assign_ipv6_multicast(ipv6_solicited_node_multicast(ipv6_unicast_candidate))
self.ipv6_unicast_candidate = ipv6_unicast_candidate
self.send_icmpv6_nd_dad_message(ipv6_unicast_candidate)
if event := self.event_icmpv6_nd_dad.acquire(timeout=1):
self.logger.warning(f"ICMPv6 ND DAD - Duplicate IPv6 address detected, {ipv6_unicast_candidate} advertised by {self.icmpv6_nd_dad_tlla}")
else:
self.logger.debug(f"ICMPv6 ND DAD - No duplicate address detected for {ipv6_unicast_candidate}")
self.ipv6_unicast_candidate = None
self.remove_ipv6_multicast(ipv6_solicited_node_multicast(ipv6_unicast_candidate))
return not event
def create_stack_ipv6_addressing(self):
""" Create lists of IPv6 unicast and multicast addresses stack should listen on """
# Check if there are any statically assigned link local addresses
for ipv6_address_candidate in list(self.stack_ipv6_address_candidate):
if (
ipv6_address_candidate.ip.is_link_local
and ipv6_address_candidate not in self.stack_ipv6_address
and self.perform_ipv6_nd_dad(ipv6_address_candidate.ip)
):
self.stack_ipv6_address_candidate.remove(ipv6_address_candidate)
self.stack_ipv6_address.append(ipv6_address_candidate)
self.assign_ipv6_unicast(ipv6_address_candidate.ip)