def SendRA(cls, netid, retranstimer=None, reachabletime=0):
validity = 300 # seconds
macaddr = cls.RouterMacAddress(netid)
lladdr = cls._RouterAddress(netid, 6)
if retranstimer is None:
# If no retrans timer was specified, pick one that's as long as the
# router lifetime. This ensures that no spurious ND retransmits
# will interfere with test expectations.
retranstimer = validity
# We don't want any routes in the main table. If the kernel doesn't support
# putting RA routes into per-interface tables, configure routing manually.
routerlifetime = validity if HAVE_AUTOCONF_TABLE else 0
ra = (scapy.Ether(src=macaddr, dst="33:33:00:00:00:01") /
scapy.IPv6(src=lladdr, hlim=255) /
scapy.ICMPv6ND_RA(reachabletime=reachabletime,
retranstimer=retranstimer,
routerlifetime=routerlifetime) /
scapy.ICMPv6NDOptSrcLLAddr(lladdr=macaddr) /
scapy.ICMPv6NDOptPrefixInfo(prefix=cls.IPv6Prefix(netid),
prefixlen=64,
L=1,
A=1,
validlifetime=validity,
preferredlifetime=validity))
posix.write(cls.tuns[netid].fileno(), str(ra))
def create_ra(dst=None):
ether_head = scapy.Ether(src=router_mac, dst=dst)
ipv6_head = scapy.IPv6()
ipv6_head.dest = 'ff02::1'
ipv6_head.src = mac2ipv6(router_mac)
ipv6_ra = scapy.ICMPv6ND_RA()
ipv6_nd_pref = scapy.ICMPv6NDOptPrefixInfo()
ipv6_nd_pref.prefix = ipv6_nd_prefix
ipv6_nd_pref.prefixlen = 64
# Valid-Lifetime 2h
ipv6_nd_pref.validlifetime = 7200
# Preferred-Lifetime 30min
ipv6_nd_pref.preferredlifetime = 1800
# ICMPv6-Option: Route Information
o_route = scapy.ICMPv6NDOptRouteInfo()
# Default Route
o_route.prefix = '::'
# Prefix length in bit
o_route.plen = 0
# Same value as the Preferred-Lifetime of the Router
o_route.rtlifetime = 1800
# ICMPv6-Option: Recursive DNS Server
o_rdns = scapy.ICMPv6NDOptRDNSS()
# List of DNS Server Addresses
o_rdns.dns = router_dns
# Same value as the Preferred-Lifetime of the Router
o_rdns.lifetime = 1800
# ICMPv6-Option: Source Link Layer Address
o_mac = scapy.ICMPv6NDOptSrcLLAddr()
# MAC address
o_mac.lladdr = router_mac
ra = (ether_head / ipv6_head / ipv6_ra / ipv6_nd_pref / o_route / o_rdns /
o_mac)
return ra
def generate(self,
lifetime,
enableDNS=False,
dns_lifetime=0,
ip_dst=None,
eth_dst=None):
"""Generates a Router Advertisement (RA) packet (ICMP over IPv6).
Args:
lifetime: RA lifetime
enableDNS: Add RDNSS option to RA (Optional)
dns_lifetime: Set DNS server lifetime (Optional)
ip_dst: IPv6 destination address (Optional)
eth_dst: Ethernet (layer 2) destination address (Optional)
"""
# Overwrite standard fields if desired
ip6_dst = (ip_dst if ip_dst is not None else RA_IP)
hw_dst = (eth_dst if eth_dst is not None else RA_MAC)
# Create IPv6 layer
base = scapy.IPv6(dst=ip6_dst, src=self.src_ipv6)
router_solicitation = scapy.ICMPv6ND_RA(routerlifetime=lifetime)
src_ll_addr = scapy.ICMPv6NDOptSrcLLAddr(lladdr=self.src_mac)
prefix = scapy.ICMPv6NDOptPrefixInfo(prefixlen=RA_PREFIX_LEN,
prefix=RA_PREFIX)
if enableDNS:
rndss = scapy.ICMPv6NDOptRDNSS(lifetime=dns_lifetime,
dns=[self.src_ipv6],
len=DNS_LEN)
ip6 = base / router_solicitation / src_ll_addr / prefix / rndss
else:
ip6 = base / router_solicitation / src_ll_addr / prefix
# Create Ethernet layer
ethernet = scapy.Ether(src=self.src_mac, dst=hw_dst)
self.packet = ethernet / ip6
return self.packet