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vxlan_tool.py2
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#
# Copyright (c) 2015 Intel, Inc., Cisco Systems, Inc. and others. All rights
# reserved.
#
# This program and the accompanying materials are made available under the
# terms of the Eclipse Public License v1.0 which accompanies this distribution,
# and is available at http://www.eclipse.org/legal/epl-v10.html
__author__ = "Yi Yang, Reinaldo Penno"
__copyright__ = "Copyright(c) 2015, Intel, Inc. and Cisco Systems, Inc."
__version__ = "0.2"
__email__ = "[email protected], [email protected]"
__status__ = "beta"
import socket, sys
import pdb
import argparse
from struct import *
from ctypes import Structure, c_ubyte, c_ushort, c_uint
NSH_TYPE1_LEN = 0x6
NSH_MD_TYPE1 = 0x1
NSH_VERSION1 = int('00', 2)
NSH_NEXT_PROTO_IPV4 = int('00000001', 2)
NSH_NEXT_PROTO_OAM = int('00000100', 2)
NSH_NEXT_PROTO_ETH = int('00000011', 2)
NSH_FLAG_ZERO = int('00000000', 2)
IP_HEADER_LEN = 5
IPV4_HEADER_LEN_BYTES = 20
IPV4_VERSION = 4
IPV4_PACKET_ID = 54321
IPV4_TTL = 255
IPV4_TOS = 0
IPV4_IHL_VER = (IPV4_VERSION << 4) + IP_HEADER_LEN
UDP_HEADER_LEN_BYTES = 8
class bcolors:
HEADER = '\033[95m'
OKBLUE = '\033[94m'
OKGREEN = '\033[92m'
WARNING = '\033[93m'
FAIL = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
class VXLAN(Structure):
_fields_ = [('flags', c_ubyte),
('reserved', c_uint, 16),
('next_protocol', c_uint, 8),
('vni', c_uint, 24),
('reserved2', c_uint, 8)]
def __init__(self, flags=int('00001000', 2), reserved=0, next_protocol=0,
vni=int('111111111111111111111111', 2), reserved2=0, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.flags = flags
self.reserved = reserved
self.next_protocol = next_protocol
self.vni = vni
self.reserved2 = reserved2
header_size = 8
def build(self):
return pack('!B H B I',
self.flags,
self.reserved,
self.next_protocol,
(self.vni << 8) + self.reserved2)
class ETHHEADER(Structure):
_fields_ = [('dmac0', c_ubyte),
('dmac1', c_ubyte),
('dmac2', c_ubyte),
('dmac3', c_ubyte),
('dmac4', c_ubyte),
('dmac5', c_ubyte),
('smac0', c_ubyte),
('smac1', c_ubyte),
('smac2', c_ubyte),
('smac3', c_ubyte),
('smac4', c_ubyte),
('smac5', c_ubyte),
('ethertype0', c_ubyte),
('ethertype1', c_ubyte)]
header_size = 14
def build(self):
return pack('!B B B B B B B B B B B B B B',
self.dmac0,
self.dmac1,
self.dmac2,
self.dmac3,
self.dmac4,
self.dmac5,
self.smac0,
self.smac1,
self.smac2,
self.smac3,
self.smac4,
self.smac5,
self.ethertype0,
self.ethertype1)
class BASEHEADER(Structure):
"""
Represent a NSH base header
"""
_fields_ = [('version', c_ushort, 2),
('flags', c_ushort, 8),
('length', c_ushort, 6),
('md_type', c_ubyte),
('next_protocol', c_ubyte),
('service_path', c_uint, 24),
('service_index', c_uint, 8)]
def __init__(self, service_path=1, service_index=255, version=NSH_VERSION1, flags=NSH_FLAG_ZERO,
length=NSH_TYPE1_LEN, md_type=NSH_MD_TYPE1, proto=NSH_NEXT_PROTO_ETH, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.version = version
self.flags = flags
self.length = length
self.md_type = md_type
self.next_protocol = proto
self.service_path = service_path
self.service_index = service_index
header_size = 8
def build(self):
return pack('!H B B I',
(self.version << 14) + (self.flags << 6) + self.length,
self.md_type,
self.next_protocol,
(self.service_path << 8) + self.service_index)
class CONTEXTHEADER(Structure):
_fields_ = [('network_platform', c_uint),
('network_shared', c_uint),
('service_platform', c_uint),
('service_shared', c_uint)]
header_size = 16
def __init__(self, network_platform=0x00, network_shared=0x00, service_platform=0x00, service_shared=0x00, *args,
**kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.network_platform = network_platform
self.network_shared = network_shared
self.service_platform = service_platform
self.service_shared = service_shared
def build(self):
return pack('!I I I I',
self.network_platform,
self.network_shared,
self.service_platform,
self.service_shared)
class IP4HEADER(Structure):
_fields_ = [
('ip_ihl', c_ubyte),
('ip_ver', c_ubyte),
('ip_tos', c_ubyte),
('ip_tot_len', c_ushort),
('ip_id', c_ushort),
('ip_frag_offset', c_ushort),
('ip_ttl', c_ubyte),
('ip_proto', c_ubyte),
('ip_chksum', c_ushort),
('ip_saddr', c_uint),
('ip_daddr', c_uint)]
header_size = 20
def build(self):
ip_header_pack = pack('!B B H H H B B H I I', IPV4_IHL_VER, self.ip_tos, self.ip_tot_len, self.ip_id,
self.ip_frag_offset, self.ip_ttl, self.ip_proto, self.ip_chksum, self.ip_saddr,
self.ip_daddr)
return ip_header_pack
def set_ip_checksum(self, checksum):
self.ip_chksum = checksum
class UDPHEADER(Structure):
"""
Represents a UDP header
"""
_fields_ = [
('udp_sport', c_ushort),
('udp_dport', c_ushort),
('udp_len', c_ushort),
('udp_sum', c_ushort)]
header_size = 8
def build(self):
udp_header_pack = pack('!H H H H', self.udp_sport, self.udp_dport, self.udp_len,
self.udp_sum)
return udp_header_pack
class PSEUDO_UDPHEADER(Structure):
""" Pseudoheader used in the UDP checksum."""
def __init__(self):
self.src_ip = 0
self.dest_ip = 0
self.zeroes = 0
self.protocol = 17
self.length = 0
def build(self):
""" Create a string from a pseudoheader """
p_udp_header_pack = pack('!I I B B H', self.src_ip, self.dest_ip,
self.zeroes, self.protocol, self.length)
return p_udp_header_pack
class TCPHEADER(Structure):
"""
Represents a TCP header
"""
_fields_ = [
('tcp_sport', c_ushort),
('tcp_dport', c_ushort),
('tcp_len', c_ushort),
('tcp_sum', c_ushort)]
header_size = 8
def decode_eth(payload, eth_header_values):
eth_header = payload[0:14]
_header_values = unpack('!B B B B B B B B B B B B B B', eth_header)
eth_header_values.dmac0 = _header_values[0]
eth_header_values.dmac1 = _header_values[1]
eth_header_values.dmac2 = _header_values[2]
eth_header_values.dmac3 = _header_values[3]
eth_header_values.dmac4 = _header_values[4]
eth_header_values.dmac5 = _header_values[5]
eth_header_values.smac0 = _header_values[6]
eth_header_values.smac1 = _header_values[7]
eth_header_values.smac2 = _header_values[8]
eth_header_values.smac3 = _header_values[9]
eth_header_values.smac4 = _header_values[10]
eth_header_values.smac5 = _header_values[11]
eth_header_values.ethertype0 = _header_values[12]
eth_header_values.ethertype1 = _header_values[13]
def decode_ip(payload, ip_header_values):
ip_header = payload[14:34]
_header_values = unpack('!B B H H H B B H I I', ip_header)
ip_header_values.ip_ihl = _header_values[0] & 0x0F
ip_header_values.ip_ver = _header_values[0] >> 4
ip_header_values.ip_tos = _header_values[1]
ip_header_values.ip_tot_len = _header_values[2]
ip_header_values.ip_id = _header_values[3]
ip_header_values.ip_frag_offset = _header_values[4]
ip_header_values.ip_ttl = _header_values[5]
ip_header_values.ip_proto = _header_values[6]
ip_header_values.ip_chksum = _header_values[7]
ip_header_values.ip_saddr = _header_values[8]
ip_header_values.ip_daddr = _header_values[9]
def decode_udp(payload, udp_header_values):
udp_header = payload[34:42]
_header_values = unpack('!H H H H', udp_header)
udp_header_values.udp_sport = _header_values[0]
udp_header_values.udp_dport = _header_values[1]
udp_header_values.udp_len = _header_values[2]
udp_header_values.udp_sum = _header_values[3]
def decode_tcp(payload, tcp_header_values):
tcp_header = payload[108:116]
_header_values = unpack('!H H H H', tcp_header)
tcp_header_values.tcp_sport = _header_values[0]
tcp_header_values.tcp_dport = _header_values[1]
tcp_header_values.tcp_len = _header_values[2]
tcp_header_values.tcp_sum = _header_values[3]
def decode_vxlan(payload, vxlan_header_values):
"""Decode the VXLAN header for a received packets"""
vxlan_header = payload[42:50]
_header_values = unpack('!B H B I', vxlan_header)
vxlan_header_values.flags = _header_values[0]
vxlan_header_values.reserved = _header_values[1]
vxlan_header_values.next_protocol = _header_values[2]
vni_rsvd2 = _header_values[3]
vxlan_header_values.vni = vni_rsvd2 >> 8
vxlan_header_values.reserved2 = vni_rsvd2 & 0x000000FF
def decode_nsh_baseheader(payload, offset, nsh_base_header_values):
"""Decode the NSH base headers for a received packets"""
base_header = payload[offset:(offset+8)]
_header_values = unpack('!H B B I', base_header)
start_idx = _header_values[0]
nsh_base_header_values.md_type = _header_values[1]
nsh_base_header_values.next_protocol = _header_values[2]
path_idx = _header_values[3]
nsh_base_header_values.version = start_idx >> 14
nsh_base_header_values.flags = start_idx >> 6
nsh_base_header_values.length = start_idx >> 0
nsh_base_header_values.service_path = path_idx >> 8
nsh_base_header_values.service_index = path_idx & 0x000000FF
def decode_nsh_contextheader(payload, offset, nsh_context_header_values):
"""Decode the NSH context headers for a received packet"""
context_header = payload[offset:(offset+16)]
_header_values = unpack('!I I I I', context_header)
nsh_context_header_values.network_platform = _header_values[0]
nsh_context_header_values.network_shared = _header_values[1]
nsh_context_header_values.service_platform = _header_values[2]
nsh_context_header_values.service_shared = _header_values[3]
def compute_internet_checksum(data):
"""
Function for Internet checksum calculation. Works
for both IP and UDP.
"""
checksum = 0
n = len(data) % 2
# data padding
pad = bytearray('', encoding='UTF-8')
if n == 1:
pad = bytearray(b'\x00')
# for i in range(0, len(data + pad) - n, 2):
for i in range(0, len(data)-1, 2):
checksum += (ord(data[i]) << 8) + (ord(data[i + 1]))
if n == 1:
checksum += (ord(data[len(data)-1]) << 8) + (pad[0])
while checksum >> 16:
checksum = (checksum & 0xFFFF) + (checksum >> 16)
checksum = ~checksum & 0xffff
return checksum
# Implements int.from_bytes(s, byteorder='big')
def int_from_bytes(s):
return sum(ord(c) << (i * 8) for i, c in enumerate(s[::-1]))
def build_ethernet_header_swap(myethheader):
""" Build Ethernet header """
newethheader=ETHHEADER()
newethheader.smac0 = myethheader.dmac0
newethheader.smac1 = myethheader.dmac1
newethheader.smac2 = myethheader.dmac2
newethheader.smac3 = myethheader.dmac3
newethheader.smac4 = myethheader.dmac4
newethheader.smac5 = myethheader.dmac5
newethheader.dmac0 = myethheader.smac0
newethheader.dmac1 = myethheader.smac1
newethheader.dmac2 = myethheader.smac2
newethheader.dmac3 = myethheader.smac3
newethheader.dmac4 = myethheader.smac4
newethheader.dmac5 = myethheader.smac5
newethheader.ethertype0 = myethheader.ethertype0
newethheader.ethertype1 = myethheader.ethertype1
return newethheader
def build_ipv4_header(ip_tot_len, proto, src_ip, dest_ip, swap_ip):
"""
Builds a complete IP header including checksum
"""
if src_ip:
ip_saddr = socket.inet_aton(src_ip)
else:
ip_saddr = socket.inet_aton(socket.gethostbyname(socket.gethostname()))
if (swap_ip == True):
new_ip_daddr = int_from_bytes(ip_saddr)
new_ip_saddr = socket.inet_aton(dest_ip)
new_ip_saddr = int_from_bytes(new_ip_saddr)
else:
new_ip_saddr = int_from_bytes(ip_saddr)
new_ip_daddr = int_from_bytes(socket.inet_aton(dest_ip))
ip_header = IP4HEADER(IP_HEADER_LEN, IPV4_VERSION, IPV4_TOS, ip_tot_len, IPV4_PACKET_ID, 0, IPV4_TTL, proto, 0, new_ip_saddr, new_ip_daddr)
checksum = compute_internet_checksum(ip_header.build())
ip_header.set_ip_checksum(checksum)
ip_header_pack = ip_header.build()
return ip_header, ip_header_pack
def build_udp_header(src_port, dest_port, ip_header, data):
"""
Building an UDP header requires fields from
IP header in order to perform checksum calculation
"""
# build UDP header with sum = 0
udp_header = UDPHEADER(src_port, dest_port, UDP_HEADER_LEN_BYTES + len(data), 0)
udp_header_pack = udp_header.build()
# build Pseudo Header
p_header = PSEUDO_UDPHEADER()
p_header.dest_ip = ip_header.ip_daddr
p_header.src_ip = ip_header.ip_saddr
p_header.length = udp_header.udp_len
p_header_pack = p_header.build()
udp_checksum = compute_internet_checksum(p_header_pack + udp_header_pack + data)
udp_header.udp_sum = udp_checksum
# pack UDP header again but this time with checksum
udp_header_pack = udp_header.build()
return udp_header, udp_header_pack
def build_udp_packet(src_ip, dest_ip, src_port, dest_port, data, swap_ip):
"""
Data needs to encoded as Python bytes. In the case of strings
this means a bytearray of an UTF-8 encoding
"""
total_len = len(data) + IPV4_HEADER_LEN_BYTES + UDP_HEADER_LEN_BYTES
# First we build the IP header
ip_header, ip_header_pack = build_ipv4_header(total_len, socket.IPPROTO_UDP, src_ip, dest_ip, swap_ip)
# Build UDP header
udp_header, udp_header_pack = build_udp_header(src_port, dest_port, ip_header, data)
udp_packet = ip_header_pack + udp_header_pack + data
return udp_packet
def getmac(interface):
try:
mac = open('/sys/class/net/'+interface+'/address').readline()
except:
mac = None
return mac
def print_ethheader(ethheader):
print("Eth Dst MAC: %.2x:%.2x:%.2x:%.2x:%.2x:%.2x, Src MAC: %.2x:%.2x:%.2x:%.2x:%.2x:%.2x, Ethertype: 0x%.4x" % (ethheader.dmac0, ethheader.dmac1, ethheader.dmac2, ethheader.dmac3, ethheader.dmac4, ethheader.dmac5, ethheader.smac0, ethheader.smac1, ethheader.smac2, ethheader.smac3, ethheader.smac4, ethheader.smac5, (ethheader.ethertype0<<8) | ethheader.ethertype1))
def print_ipheader(ipheader):
print("IP Version: %s IP Header Length: %s, TTL: %s, Protocol: %s, Src IP: %s, Dst IP: %s" % (ipheader.ip_ver, ipheader.ip_ihl, ipheader.ip_ttl, ipheader.ip_proto, str(socket.inet_ntoa(pack('!I', ipheader.ip_saddr))), str(socket.inet_ntoa(pack('!I', ipheader.ip_daddr)))))
def print_udpheader(udpheader):
print ("UDP Src Port: %s, Dst Port: %s, Length: %s, Checksum: %s" % (udpheader.udp_sport, udpheader.udp_dport, udpheader.udp_len, udpheader.udp_sum))
def print_vxlanheader(vxlanheader):
print("VxLAN/VxLAN-gpe VNI: %s, flags: %.2x, Next: %s" % (vxlanheader.vni, vxlanheader.flags, vxlanheader.next_protocol))
def print_nsh_baseheader(nshbaseheader):
print("NSH base nsp: %s, nsi: %s" % (nshbaseheader.service_path, nshbaseheader.service_index))
def print_nsh_contextheader(nshcontextheader):
print("NSH context c1: 0x%.8x, c2: 0x%.8x, c3: 0x%.8x, c4: 0x%.8x" % (nshcontextheader.network_platform, nshcontextheader.network_shared, nshcontextheader.service_platform, nshcontextheader.service_shared))
def main():
parser = argparse.ArgumentParser(description='This is a VxLAN/VxLAN-gpe + NSH dump and forward tool, you can use it to dump and forward VxLAN/VxLAN-gpe + NSH packets, it can also act as an NSH-aware SF for SFC test when you use --forward option, in that case, it will automatically decrease nsi by one.', prog='vxlan_tool.py')
parser.add_argument('-i', '--interface',
help='Specify the interface to listen')
parser.add_argument('-d', '--do', choices=['dump', 'forward', 'send'],
help='dump/foward/send VxLAN/VxLAN-gpe + NSH or Eth + NSH packet')
parser.add_argument('-t', '--type', choices=['eth_nsh', 'vxlan_gpe_nsh'], default='vxlan_gpe_nsh',
help='Specify packet type for send: eth_nsh or vxlan_gpe_nsh')
parser.add_argument('--outer-source-mac',
help='Specify outer source MAC for packet send')
parser.add_argument('--outer-destination-mac',
help='Specify outer destination MAC for packet send')
parser.add_argument('--outer-source-ip',
help='Specify outer source IP address for packet send')
parser.add_argument('--outer-destination-ip',
help='Specify outer destination IP address for packet send')
parser.add_argument('--outer-source-udp-port', type=int,
help='Specify outer source UDP port for packet send')
parser.add_argument('--inner-source-mac',
help='Specify inner source MAC for packet send')
parser.add_argument('--inner-destination-mac',
help='Specify inner destination MAC for packet send')
parser.add_argument('--inner-source-ip',
help='Specify inner source IP address for packet send')
parser.add_argument('--inner-destination-ip',
help='Specify inner destination IP address for packet send')
parser.add_argument('--inner-source-udp-port', type=int,
help='Specify inner source UDP port for packet send')
parser.add_argument('--inner-destination-udp-port', type=int,
help='Specify inner destination UDP port for packet send')
parser.add_argument('-n', '--number', type=int,
help='Specify number of packet to send')
parser.add_argument('--no-swap-ip', dest='swap_ip', default=True, action='store_false',
help="won't swap ip if provided")
parser.add_argument('-v', '--verbose', choices=['on', 'off'],
help='dump packets when in forward mode')
parser.add_argument('--forward-inner', '-f', dest='forward_inner',
default=False, action='store_true',
help='Strip the outer encapsulation and forward the inner packet')
parser.add_argument('--block', '-b', type=int, default=0,
help='Acts as a firewall dropping packets that match this TCP dst port')
args = parser.parse_args()
macaddr = None
try:
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(0x0003))
if args.interface is not None:
s.bind((args.interface, 0))
if ((args.do == "forward") or (args.do == "send")):
if args.interface is None:
print("Error: you must specify the interface by -i or --interface for forward and send")
sys.exit(-1)
send_s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
send_s.bind((args.interface, 0))
if args.interface is not None:
macstring = getmac(args.interface)
if (macstring is not None):
macaddr = macstring.split(':')
if (args.do == "send"):
if (args.inner_source_mac is None):
args.inner_source_mac = macstring
if (args.inner_destination_mac is None):
print("Error: you must specify inner destination MAC for packet send")
sys.exit(-1)
if (args.inner_source_ip is None) or (args.inner_destination_ip is None):
print("Error: you must specify inner source IP and inner destination IP for packet send")
sys.exit(-1)
if (args.outer_source_mac is None):
args.outer_source_mac = args.inner_source_mac
if (args.outer_destination_mac is None):
args.outer_destination_mac = args.inner_destination_mac
if (args.outer_source_ip is None):
args.outer_source_ip = args.inner_source_ip
if (args.outer_destination_ip is None):
args.outer_destination_ip = args.inner_destination_ip
if (args.outer_source_udp_port is None):
args.outer_source_udp_port = 55651
if (args.inner_source_udp_port is None):
args.inner_source_udp_port = args.outer_source_udp_port
if (args.inner_destination_udp_port is None):
args.inner_destination_udp_port = 25
if (args.number is None):
args.number = 10
except OSError as e:
print("{}".format(e) + " '%s'" % args.interface)
sys.exit(-1)
do_print = ((args.do != "forward") or (args.verbose == "on"))
vxlan_gpe_udp_ports = [4790, 6633]
vxlan_udp_ports = [4789] + vxlan_gpe_udp_ports
#header len
eth_length = 14
ip_length = 20
udp_length = 8
vxlan_length = 8
nshbase_length = 8
nshcontext_length = 16
# receive a packet
pktnum=0
while True:
packet = s.recvfrom(65565)
#packet string from tuple
packet = packet[0]
myethheader = ETHHEADER()
""" Decode ethernet header """
decode_eth(packet, myethheader)
pdb.set_trace()
if ((myethheader.ethertype0 != 0x08) or (myethheader.ethertype1 != 0x00)):
if ((myethheader.ethertype0 != 0x89) or (myethheader.ethertype1 != 0x4f)):
continue
if (macaddr is not None):
if ((myethheader.dmac4 != int(macaddr[4], 16)) or (myethheader.dmac5 != int(macaddr[5], 16))):
continue
""" Check if the received packet was ETH + NSH """
if ((myethheader.ethertype0 == 0x89) or (myethheader.ethertype1 == 0x4f)):
pktnum = pktnum + 1
print("\n\nPacket #%d" % pktnum)
""" Eth + NSH """
mynshbaseheader = BASEHEADER()
mynshcontextheader = CONTEXTHEADER()
offset = eth_length
decode_nsh_baseheader(packet, offset, mynshbaseheader)
decode_nsh_contextheader(packet, offset + nshbase_length, mynshcontextheader)
""" Print ethernet header """
print_ethheader(myethheader)
""" Print NSH base header """
print_nsh_baseheader(mynshbaseheader)
""" Print NSH context header """
print_nsh_contextheader(mynshcontextheader)
if ((args.do == "forward") and (args.interface is not None)):
""" nsi minus one for send """
mynshbaseheader.service_index = mynshbaseheader.service_index - 1
""" Build Ethernet header """
newethheader = build_ethernet_header_swap(myethheader)
""" Build Ethernet packet """
pkt = newethheader.build() + mynshbaseheader.build() + mynshcontextheader.build() + packet[eth_length+nshbase_length+nshcontext_length:]
""" Send it and make sure all the data is sent out """
while pkt:
sent = send_s.send(pkt)
pkt = pkt[sent:]
continue
pktnum = pktnum + 1
#if (do_print):
# print("\n\nPacket #%d" % pktnum)
""" Print ethernet header """
#if (do_print):
# print_ethheader(myethheader)
myipheader = IP4HEADER()
""" Decode IP header """
decode_ip(packet, myipheader)
""" Print IP header """
#if (do_print):
# print_ipheader(myipheader)
if (myipheader.ip_proto == 1):
if (myipheader.ip_proto != 17):
continue
myudpheader = UDPHEADER()
""" Decode UDP header """
decode_udp(packet, myudpheader)
""" Print UDP header """
if (do_print):
print("\n\nPacket #%d" % pktnum)
print_udpheader(myudpheader)
if (myudpheader.udp_dport not in vxlan_udp_ports):
continue
myvxlanheader = VXLAN()
""" Decode VxLAN/VxLAN-gpe header """
decode_vxlan(packet, myvxlanheader)
""" Print VxLAN/VxLAN-gpe header """
if (do_print):
print_vxlanheader(myvxlanheader)
mynshbaseheader = BASEHEADER()
mynshcontextheader = CONTEXTHEADER()
""" Print NSH header """
if (myudpheader.udp_dport in vxlan_gpe_udp_ports):
if (myvxlanheader.next_protocol == 0x04):
offset = eth_length + ip_length + udp_length + vxlan_length
decode_nsh_baseheader(packet, offset, mynshbaseheader)
decode_nsh_contextheader(packet, offset + nshbase_length, mynshcontextheader)
""" Print NSH base header """
if (do_print):
print_nsh_baseheader(mynshbaseheader)
""" Print NSH context header """
if (do_print):
print_nsh_contextheader(mynshcontextheader)
#myvxlanheader.next_protocol
""" Check if Firewall checking is enabled, and block/drop if its the same TCP port """
if (args.block != 0):
mytcpheader = TCPHEADER()
decode_tcp(packet,mytcpheader)
if (mytcpheader.tcp_dport == args.block):
print bcolors.WARNING + "TCP packet dropped on port: " + str(args.block) + bcolors.ENDC
continue
if ((args.do == "forward") and (args.interface is not None) and (mynshbaseheader.service_index > 1)):
""" Build Ethernet header """
newethheader = build_ethernet_header_swap(myethheader)
""" Build the packet, either encapsulated, or the original inner packet """
pkt = None
if args.forward_inner:
""" Just build the original, inner packet """
inner_offset = eth_length + ip_length + udp_length + vxlan_length + nshbase_length + nshcontext_length
inner_ethheader = ETHHEADER()
# Get the inner ethernet header
decode_eth(packet[inner_offset:], inner_ethheader)
# The new SourceMac should be the outer dest, and the new DestMac should be the inner dest
# This call sets the new SourceMac to be the outer dest
newethheader = build_ethernet_header_swap(myethheader)
# Now set the DestMac to be the inner dest
newethheader.dmac0 = inner_ethheader.dmac0
newethheader.dmac1 = inner_ethheader.dmac1
newethheader.dmac2 = inner_ethheader.dmac2
newethheader.dmac3 = inner_ethheader.dmac3
newethheader.dmac4 = inner_ethheader.dmac4
newethheader.dmac5 = inner_ethheader.dmac5
pkt = newethheader.build() + packet[inner_offset + eth_length:]
else:
""" Build IP packet"""
if (myudpheader.udp_dport in vxlan_gpe_udp_ports):
""" nsi minus one """
mynshbaseheader.service_index = mynshbaseheader.service_index - 1
ippack = build_udp_packet(str(socket.inet_ntoa(pack('!I', myipheader.ip_saddr))), str(socket.inet_ntoa(pack('!I', myipheader.ip_daddr))), myudpheader.udp_sport, myudpheader.udp_dport, myvxlanheader.build() + mynshbaseheader.build() + mynshcontextheader.build() + packet[eth_length+ip_length+udp_length+vxlan_length+nshbase_length+nshcontext_length:], args.swap_ip)
else:
ippack = build_udp_packet(str(socket.inet_ntoa(pack('!I', myipheader.ip_saddr))), str(socket.inet_ntoa(pack('!I', myipheader.ip_daddr))), myudpheader.udp_sport, myudpheader.udp_dport, packet[eth_length+ip_length+udp_length:], args.swap_ip)
""" Build Ethernet packet """
pkt = newethheader.build() + ippack
""" Send it and make sure all the data is sent out """
while pkt:
sent = send_s.send(pkt)
pkt = pkt[sent:]
else:
offset = eth_length + ip_length + udp_length + vxlan_length + eth_length
decode_nsh_baseheader(packet, offset, mynshbaseheader)
decode_nsh_contextheader(packet, offset + nshbase_length, mynshcontextheader)
""" Print NSH base header """
if (do_print):
print_nsh_baseheader(mynshbaseheader)
""" Print NSH context header """
if (do_print):
print_nsh_contextheader(mynshcontextheader)
""" Check if Firewall checking is enabled, and block/drop if its the same TCP port """
if (args.block != 0):
mytcpheader = TCPHEADER()
decode_tcp(packet,mytcpheader)
if (mytcpheader.tcp_dport == args.block):
print bcolors.WARNING + "TCP packet dropped on port: " + str(args.block) + bcolors.ENDC
continue
if ((args.do == "forward") and (args.interface is not None) and (mynshbaseheader.service_index > 1)):
""" Build Ethernet header """
newethheader = build_ethernet_header_swap(myethheader)
""" Build the packet, either encapsulated, or the original inner packet """
pkt = None
if args.forward_inner:
""" Just build the original, inner packet """
inner_offset = eth_length + ip_length + udp_length + vxlan_length + eth_length + nshbase_length + nshcontext_length
inner_ethheader = ETHHEADER()
# Get the inner ethernet header
decode_eth(packet[inner_offset:], inner_ethheader)
# The new SourceMac should be the outer dest, and the new DestMac should be the inner dest
# This call sets the new SourceMac to be the outer dest
newethheader = build_ethernet_header_swap(myethheader)
# Now set the DestMac to be the inner dest
newethheader.dmac0 = inner_ethheader.dmac0
newethheader.dmac1 = inner_ethheader.dmac1
newethheader.dmac2 = inner_ethheader.dmac2
newethheader.dmac3 = inner_ethheader.dmac3
newethheader.dmac4 = inner_ethheader.dmac4
newethheader.dmac5 = inner_ethheader.dmac5
pkt = newethheader.build() + packet[inner_offset + eth_length:]
else:
""" Build IP packet"""
if (myudpheader.udp_dport in vxlan_gpe_udp_ports):
""" nsi minus one """
mynshbaseheader.service_index = mynshbaseheader.service_index - 1
ippack = build_udp_packet(str(socket.inet_ntoa(pack('!I', myipheader.ip_saddr))), str(socket.inet_ntoa(pack('!I', myipheader.ip_daddr))), myudpheader.udp_sport, myudpheader.udp_dport, myvxlanheader.build() + newethheader.build() + mynshbaseheader.build() + mynshcontextheader.build() + packet[eth_length+ip_length+udp_length+vxlan_length+eth_length+nshbase_length+nshcontext_length:], args.swap_ip)
else:
ippack = build_udp_packet(str(socket.inet_ntoa(pack('!I', myipheader.ip_saddr))), str(socket.inet_ntoa(pack('!I', myipheader.ip_daddr))), myudpheader.udp_sport, myudpheader.udp_dport, packet[eth_length+ip_length+udp_length:], args.swap_ip)
""" Build Ethernet packet """
pkt = newethheader.build() + ippack
""" Send it and make sure all the data is sent out """
while pkt:
sent = send_s.send(pkt)
pkt = pkt[sent:]
if __name__ == "__main__":
main()