def send_icmp6_nd_dad_message(self, ip6_unicast_candidate):
""" Send out ICMPv6 ND Duplicate Address Detection message """
self.phtx_icmp6(
ip6_src=IPv6Address("::"),
ip6_dst=ip6_solicited_node_multicast(ip6_unicast_candidate),
ip6_hop=255,
icmp6_type=ps_icmp6.ICMP6_NEIGHBOR_SOLICITATION,
icmp6_ns_target_address=ip6_unicast_candidate,
)
self.logger.debug(
f"Sent out ICMPv6 ND DAD message for {ip6_unicast_candidate}")
def perform_ip6_nd_dad(self, ip6_unicast_candidate):
""" Perform IPv6 ND Duplicate Address Detection, return True if passed """
self.logger.debug(
f"ICMPv6 ND DAD - Starting process for {ip6_unicast_candidate}")
self.assign_ip6_multicast(
ip6_solicited_node_multicast(ip6_unicast_candidate))
self.ip6_unicast_candidate = ip6_unicast_candidate
self.send_icmp6_nd_dad_message(ip6_unicast_candidate)
if event := self.event_icmp6_nd_dad.acquire(timeout=1):
self.logger.warning(
f"ICMPv6 ND DAD - Duplicate IPv6 address detected, {ip6_unicast_candidate} advertised by {self.icmp6_nd_dad_tlla}"
)
def __send_icmp6_neighbor_solicitation(icmp6_ns_target_address):
""" Enqueue ICMPv6 Neighbor Solicitation packet with TX ring """
# Pick apropriate source address
ip6_src = IPv6Address("::")
for stack_ip6_address in stack.packet_handler.stack_ip6_address:
if icmp6_ns_target_address in stack_ip6_address.network:
ip6_src = stack_ip6_address.ip
# Send out ND Solicitation message
stack.packet_handler.phtx_icmp6(
ip6_src=ip6_src,
ip6_dst=ip6_solicited_node_multicast(icmp6_ns_target_address),
ip6_hop=255,
icmp6_type=ps_icmp6.ICMP6_NEIGHBOR_SOLICITATION,
icmp6_ns_target_address=icmp6_ns_target_address,
icmp6_nd_options=[
ps_icmp6.Icmp6NdOptSLLA(
opt_slla=stack.packet_handler.stack_mac_unicast[0])
],
)
def remove_ip6_unicast(self, ip6_unicast):
""" Remove IPv6 unicast address from the list stack listens on """
self.stack_ip6_unicast.remove(ip6_unicast)
self.logger.debug(f"Removed IPv6 unicast {ip6_unicast}")
self.remove_ip6_multicast(ip6_solicited_node_multicast(ip6_unicast))
def assign_ip6_unicast(self, ip6_unicast):
""" Assign IPv6 unicast address to the list stack listens on """
self.stack_ip6_unicast.append(ip6_unicast)
self.logger.debug(f"Assigned IPv6 unicast {ip6_unicast}")
self.assign_ip6_multicast(ip6_solicited_node_multicast(ip6_unicast))
f"ICMPv6 ND DAD - Starting process for {ip6_unicast_candidate}")
self.assign_ip6_multicast(
ip6_solicited_node_multicast(ip6_unicast_candidate))
self.ip6_unicast_candidate = ip6_unicast_candidate
self.send_icmp6_nd_dad_message(ip6_unicast_candidate)
if event := self.event_icmp6_nd_dad.acquire(timeout=1):
self.logger.warning(
f"ICMPv6 ND DAD - Duplicate IPv6 address detected, {ip6_unicast_candidate} advertised by {self.icmp6_nd_dad_tlla}"
)
else:
self.logger.debug(
f"ICMPv6 ND DAD - No duplicate address detected for {ip6_unicast_candidate}"
)
self.ip6_unicast_candidate = None
self.remove_ip6_multicast(
ip6_solicited_node_multicast(ip6_unicast_candidate))
return not event
def parse_stack_ip6_address_candidate(self):
""" Parse IPv6 candidate addresses configured in stack.py module """
address_candidate = []
for address, gateway in stack.ip6_address_candidate:
self.logger.debug(f"Parsing ('{address}', '{gateway}') entry")
try:
address = IPv6Interface(address)
except AddressValueError:
self.logger.warning(
f"Invalid host address '{address}' format, skiping...")
return None