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 packets_for_test(request, ptfadapter, duthost, config_facts, tbinfo,
ip_and_intf_info):
ip_version = request.param
src_addr_v4, src_addr_v6, ptf_intf = ip_and_intf_info
ptf_intf_index = int(ptf_intf.replace('eth', ''))
ptf_intf_mac = ptfadapter.dataplane.get_mac(0, ptf_intf_index)
vlans = config_facts['VLAN']
topology = tbinfo['topo']['name']
dut_mac = ''
for vlan_details in vlans.values():
if 'dualtor' in topology:
dut_mac = vlan_details['mac'].lower()
else:
dut_mac = duthost.shell(
'sonic-cfggen -d -v \'DEVICE_METADATA.localhost.mac\''
)["stdout_lines"][0].decode("utf-8")
break
if ip_version == 'v4':
tgt_addr = increment_ipv4_addr(src_addr_v4)
out_pkt = testutils.simple_arp_packet(eth_dst='ff:ff:ff:ff:ff:ff',
eth_src=ptf_intf_mac,
ip_snd=src_addr_v4,
ip_tgt=tgt_addr,
arp_op=1,
hw_snd=ptf_intf_mac)
exp_pkt = testutils.simple_arp_packet(eth_dst=ptf_intf_mac,
eth_src=dut_mac,
ip_snd=tgt_addr,
ip_tgt=src_addr_v4,
arp_op=2,
hw_snd=dut_mac,
hw_tgt=ptf_intf_mac)
elif ip_version == 'v6':
tgt_addr = increment_ipv6_addr(src_addr_v6)
ll_src_addr = generate_link_local_addr(ptf_intf_mac)
multicast_tgt_addr = in6_getnsma(inet_pton(socket.AF_INET6, tgt_addr))
multicast_tgt_mac = in6_getnsmac(multicast_tgt_addr)
out_pkt = Ether(src=ptf_intf_mac, dst=multicast_tgt_mac)
out_pkt /= IPv6(dst=inet_ntop(socket.AF_INET6, multicast_tgt_addr),
src=ll_src_addr)
out_pkt /= ICMPv6ND_NS(tgt=tgt_addr)
out_pkt /= ICMPv6NDOptSrcLLAddr(lladdr=ptf_intf_mac)
exp_pkt = Ether(src=dut_mac, dst=ptf_intf_mac)
exp_pkt /= IPv6(dst=ll_src_addr, src=generate_link_local_addr(dut_mac))
exp_pkt /= ICMPv6ND_NA(tgt=tgt_addr, S=1, R=1, O=0)
exp_pkt /= ICMPv6NDOptSrcLLAddr(type=2, lladdr=dut_mac)
exp_pkt = mask.Mask(exp_pkt)
exp_pkt.set_do_not_care_scapy(packet.IPv6, 'fl')
return ip_version, out_pkt, exp_pkt
def build_arp_ns_pkt(family, smac, src_ip, dst_ip):
if family == 'IPv4':
eth = Ether(src=smac, dst='ff:ff:ff:ff:ff:ff')
pkt = eth/ARP(op='who-has', pdst=dst_ip)
elif family == 'IPv6':
nsma = in6_getnsma(inet_pton(AF_INET6, dst_ip))
mcast_dst_ip = inet_ntop(AF_INET6, nsma)
dmac = in6_getnsmac(nsma)
eth = Ether(src=smac,dst=dmac)
ipv6 = IPv6(src=src_ip, dst=mcast_dst_ip)
ns = ICMPv6ND_NS(tgt=dst_ip)
ns_opt = ICMPv6NDOptSrcLLAddr(lladdr=smac)
pkt = eth/ipv6/ns/ns_opt
return pkt
def build_arp_ns_pkt(family, smac, src_ip, dst_ip):
if family == 'IPv4':
eth = Ether(src=smac, dst='ff:ff:ff:ff:ff:ff')
pkt = eth/ARP(op=ARP.who_has, pdst=dst_ip)
elif family == 'IPv6':
nsma = in6_getnsma(inet_pton(AF_INET6, dst_ip))
mcast_dst_ip = inet_ntop(AF_INET6, nsma)
dmac = in6_getnsmac(nsma)
eth = Ether(src=smac,dst=dmac)
ipv6 = IPv6(src=src_ip, dst=mcast_dst_ip)
ns = ICMPv6ND_NS(tgt=dst_ip)
ns_opt = ICMPv6NDOptSrcLLAddr(lladdr=smac)
pkt = eth/ipv6/ns/ns_opt
return pkt
def ipv6_packets_for_test(ip_and_intf_info, fake_src_mac, fake_src_addr):
_, _, src_addr_v6, _, _ = ip_and_intf_info
fake_src_mac = fake_src_mac
tgt_addr = increment_ipv6_addr(src_addr_v6)
multicast_tgt_addr = in6_getnsma(inet_pton(socket.AF_INET6, tgt_addr))
multicast_tgt_mac = in6_getnsmac(multicast_tgt_addr)
ns_pkt = Ether(src=fake_src_mac, dst=multicast_tgt_mac)
ns_pkt /= IPv6(dst=inet_ntop(socket.AF_INET6, multicast_tgt_addr),
src=fake_src_addr)
ns_pkt /= ICMPv6ND_NS(tgt=tgt_addr)
ns_pkt /= ICMPv6NDOptSrcLLAddr(lladdr=fake_src_mac)
logging.info(repr(ns_pkt))
return ns_pkt
