def process_and_accept(packet):
packet.accept()
data = packet.get_payload()
address = int(binascii.hexlify(data[16:20]), 16)
lookup = socket.inet_ntoa(struct.pack(">I", address))
try:
if classify_map[lookup]['sff'] != '':
packet = build_packet(vxlan_values, base_values, ctx_values) + data
logger.info(binascii.hexlify(data))
logger.info(binascii.hexlify(packet))
UDP_IP = classify_map[lookup]['sff']
UDP_PORT = int(classify_map[lookup]['port'])
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
sock.sendto(packet, (UDP_IP, UDP_PORT))
if __debug__ is False:
logger.debug('Sending NSH encapsulated packet to SFF: %s',
UDP_IP)
except socket.error as exc:
logger.exception('Socket Error: %s', exc)
finally:
sock.close()
except KeyError as exc:
logger.exception('Classification failed: %s', exc)
def process_and_accept(packet):
packet.accept()
data = packet.get_payload()
address = int(binascii.hexlify(data[16:20]), 16)
lookup = socket.inet_ntoa(struct.pack(">I", address))
try:
if classify_map[lookup]['sff'] != '':
packet = build_packet(vxlan_values, base_values, ctx_values) + data
logger.info(binascii.hexlify(data))
logger.info(binascii.hexlify(packet))
UDP_IP = classify_map[lookup]['sff']
UDP_PORT = int(classify_map[lookup]['port'])
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
sock.sendto(packet, (UDP_IP, UDP_PORT))
if __debug__ is False:
logger.debug('Sending NSH encapsulated packet to SFF: %s',
UDP_IP)
except socket.error as exc:
logger.exception('Socket Error: %s', exc)
finally:
sock.close()
except KeyError as exc:
logger.exception('Classification failed: %s', exc)
def process_packet(self, orig_packet):
# check
if not self._fw_params_set:
logger.error(
'process_packet: Forwarding params not set for '
'path_id=%d', self.path_id)
return
if not self._tun_params_set:
logger.error(
'process_packet: Tunnel params not set for '
'path_id=%d', self.path_id)
return
logger.debug('process_packet: Forwarding packet to %s:%d',
self.sff_ip_addr, self.sff_port)
orig_payload = orig_packet.get_payload()
vxlan_packet = build_packet(self.vxlan_values, self.base_values,
self.ctx_values) + orig_payload
self.socket.sendto(vxlan_packet, (self.sff_ip_addr, self.sff_port))
# ! drop original packet
orig_packet.drop()
return
def forward_packet(self, packet, rsp_id, ipv):
"""
Encapsulate given packet with NSH and forward it to SFF related with
currently matched RSP
:param packet: packet to process
:type packet: `:class:netfilterqueue.Packet`
:param rsp_id: RSP identifier
:type rsp_id: int
:param ipv: IP version
:type ipv: int
"""
fwd_to = self.rsp_2_sff[rsp_id]['sff']
next_protocol = ipv_2_next_protocol[ipv]
# NOTES:
# so far metadata are not supported -> just sending an empty ctx_header
# tunnel_id (0x0500) is hard-coded, will it be always the same?
ctx_header = CONTEXTHEADER(network_shared=0,
service_shared=0,
network_platform=0,
service_platform=0)
vxlan_header = VXLANGPE(vni=0x0500,
reserved=0,
reserved2=64,
protocol_type=0x894F,
flags=int('00000100', 2))
base_header = BASEHEADER(length=0x6,
version=0x1,
md_type=0x1,
service_path=rsp_id,
flags=int('00000000', 2),
next_protocol=next_protocol,
service_index=fwd_to['starting-index'])
nsh_encapsulation = build_packet(vxlan_header, base_header, ctx_header)
nsh_packet = nsh_encapsulation + packet.get_payload()
self.fwd_socket.sendto(nsh_packet, (fwd_to['ip'], fwd_to['port']))
def process_packet(self, orig_packet):
# check
if not self._fw_params_set:
logger.error('process_packet: Forwarding params not set for '
'path_id=%d', self.path_id)
return
if not self._tun_params_set:
logger.error('process_packet: Tunnel params not set for '
'path_id=%d', self.path_id)
return
logger.debug('process_packet: Forwarding packet to %s:%d',
self.sff_ip_addr, self.sff_port)
orig_payload = orig_packet.get_payload()
vxlan_packet = build_packet(self.vxlan_values,
self.base_values,
self.ctx_values) + orig_payload
self.socket.sendto(vxlan_packet, (self.sff_ip_addr, self.sff_port))
# ! drop original packet
orig_packet.drop()
return
