def build_syn_pkt(local_addr, peer_addr):
pkt = testutils.simple_tcp_packet(pktlen=54,
ip_src=local_addr,
ip_dst=peer_addr,
tcp_dport=BGP_PORT,
tcp_flags="S")
exp_packet = Mask(pkt)
exp_packet.set_do_not_care_scapy(scapy.Ether, "dst")
exp_packet.set_do_not_care_scapy(scapy.Ether, "src")
exp_packet.set_do_not_care_scapy(scapy.IP, "version")
exp_packet.set_do_not_care_scapy(scapy.IP, "ihl")
exp_packet.set_do_not_care_scapy(scapy.IP, "tos")
exp_packet.set_do_not_care_scapy(scapy.IP, "len")
exp_packet.set_do_not_care_scapy(scapy.IP, "flags")
exp_packet.set_do_not_care_scapy(scapy.IP, "id")
exp_packet.set_do_not_care_scapy(scapy.IP, "frag")
exp_packet.set_do_not_care_scapy(scapy.IP, "ttl")
exp_packet.set_do_not_care_scapy(scapy.IP, "chksum")
exp_packet.set_do_not_care_scapy(scapy.IP, "options")
exp_packet.set_do_not_care_scapy(scapy.TCP, "sport")
exp_packet.set_do_not_care_scapy(scapy.TCP, "seq")
exp_packet.set_do_not_care_scapy(scapy.TCP, "ack")
exp_packet.set_do_not_care_scapy(scapy.TCP, "reserved")
exp_packet.set_do_not_care_scapy(scapy.TCP, "dataofs")
exp_packet.set_do_not_care_scapy(scapy.TCP, "window")
exp_packet.set_do_not_care_scapy(scapy.TCP, "chksum")
exp_packet.set_do_not_care_scapy(scapy.TCP, "urgptr")
exp_packet.set_ignore_extra_bytes()
return exp_packet
def generate_expected_packet(self, inner_pkt):
"""
Generate ip_in_ip packet for verifying.
"""
inner_pkt = inner_pkt.copy()
inner_pkt.ttl = inner_pkt.ttl - 1
pkt = scapy.Ether(dst=self.active_tor_mac, src=self.standby_tor_mac) / \
scapy.IP(src=self.standby_tor_ip, dst=self.active_tor_ip) / inner_pkt[IP]
exp_pkt = Mask(pkt)
exp_pkt.set_do_not_care_scapy(scapy.Ether, 'dst')
exp_pkt.set_do_not_care_scapy(scapy.IP, "ihl")
exp_pkt.set_do_not_care_scapy(scapy.IP, "tos")
exp_pkt.set_do_not_care_scapy(scapy.IP, "len")
exp_pkt.set_do_not_care_scapy(scapy.IP, "id")
exp_pkt.set_do_not_care_scapy(scapy.IP, "flags")
exp_pkt.set_do_not_care_scapy(scapy.IP, "frag")
exp_pkt.set_do_not_care_scapy(scapy.IP, "ttl")
exp_pkt.set_do_not_care_scapy(scapy.IP, "proto")
exp_pkt.set_do_not_care_scapy(scapy.IP, "chksum")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "sport")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "seq")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "ack")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "reserved")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "dataofs")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "window")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "chksum")
exp_pkt.set_do_not_care_scapy(scapy.TCP, "urgptr")
exp_pkt.set_ignore_extra_bytes()
return exp_pkt
def generatePkts(self, gw, port_ip, port_mac, vlan_id):
pkt = testutils.simple_arp_packet(ip_snd=port_ip,
ip_tgt=gw,
eth_src=port_mac,
hw_snd=port_mac,
vlan_vid=vlan_id)
exp_pkt = testutils.simple_arp_packet(ip_snd=gw,
ip_tgt=port_ip,
eth_src=self.dut_mac,
eth_dst=port_mac,
hw_snd=self.dut_mac,
hw_tgt=port_mac,
arp_op=2,
vlan_vid=vlan_id)
masked_exp_pkt = Mask(exp_pkt)
# Ignore the Ethernet padding zeros
masked_exp_pkt.set_ignore_extra_bytes()
return pkt, masked_exp_pkt
def generate_unexpected_packet(self, inner_pkt):
"""
Generate a packet that shouldn't be observed.
All packet should be forward via tunnel, so no packet should be observed on server port
"""
pkt = inner_pkt.copy()
pkt[Ether].src = self.vlan_mac
# TTL of packets from active tor to server is decreased by 1
pkt[IP].ttl -= 1
unexpected_packet = Mask(pkt)
# Ignore dst mac
unexpected_packet.set_do_not_care_scapy(scapy.Ether, 'dst')
# Ignore check sum
unexpected_packet.set_do_not_care_scapy(scapy.IP, "chksum")
#Ignore extra bytes
unexpected_packet.set_ignore_extra_bytes()
return unexpected_packet
