def SendRA(cls, netid, retranstimer=None, reachabletime=0, options=()):
validity = cls.RA_VALIDITY # 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 * 1000 # Lifetime is in s, retrans timer in ms.
# 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.OnlinkPrefix(6, netid),
prefixlen=cls.OnlinkPrefixLen(6),
L=1,
A=1,
validlifetime=validity,
preferredlifetime=validity))
for option in options:
ra /= option
posix.write(cls.tuns[netid].fileno(), str(ra))
def send(dstmac, interval, count, lifetime, iface):
"""Generate IPv6 Router Advertisement and send to destination.
@param dstmac: string HWAddr of the destination ipv6 node.
@param interval: int Time to sleep between consecutive packets.
@param count: int Number of packets to be sent.
@param lifetime: Router lifetime value for the original RA.
@param iface: string Router's WiFi interface to send packets over.
"""
while count:
ra = (scapy.Ether(dst=dstmac) / scapy.IPv6() /
scapy.ICMPv6ND_RA(routerlifetime=lifetime))
scapy.sendp(ra, iface=iface)
count = count - 1
time.sleep(interval)
lifetime = lifetime - interval
def send(dstmac, interval, count, lifetime, iface, rtt):
"""Generate IPv6 Router Advertisement and send to destination.
Args:
1. dstmac: string HWAddr of the destination ipv6 node.
2. interval: int Time to sleep between consecutive packets.
3. count: int Number of packets to be sent.
4. lifetime: Router lifetime value for the original RA.
5. iface: string Router's WiFi interface to send packets over.
6. rtt: retrans timer in the RA packet
"""
while count:
ra = (scapy.Ether(dst=dstmac) / scapy.IPv6() /
scapy.ICMPv6ND_RA(routerlifetime=lifetime, retranstimer=rtt))
scapy.sendp(ra, iface=iface)
count = count - 1
time.sleep(interval)
lifetime = lifetime - interval
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
