from state import flow_emap
EXP_TIME = 10 * 1000
EXT_PORT = 1
if a_packet_received:
flow_emap.expire_all(now - EXP_TIME)
h3 = pop_header(tcpudp, on_mismatch=([],[]))
h2 = pop_header(ipv4, on_mismatch=([],[]))
h1 = pop_header(ether, on_mismatch=([],[]))
flow_indx = h3.dst_port - start_port
if received_on_port == EXT_PORT and flow_emap.has_idx(flow_indx):
internal_flow = flow_emap.get_key(flow_indx)
flow_emap.refresh_idx(flow_indx, now)
if (internal_flow.dip == h2.saddr and
internal_flow.dp == h3.src_port and
internal_flow.prot == h2.npid):
return ([internal_flow.idev],
[ether(h1, saddr=..., daddr=...),
ipv4(h2, cksum=..., saddr=internal_flow.dip, daddr=internal_flow.sip),
tcpudp(src_port=internal_flow.dp, dst_port=internal_flow.sp)])
else:
pass
else: # packet from the internal network
pass
from state import flow_emap, int_devices
EXP_TIME = 10 * 1000
EXT_DEVICE = 1
if a_packet_received:
flow_emap.expire_all(now - EXP_TIME)
h3 = pop_header(tcpudp, on_mismatch=([],[]))
h2 = pop_header(ipv4, on_mismatch=([],[]))
h1 = pop_header(ether, on_mismatch=([],[]))
if received_on_port == EXT_DEVICE:
internal_flow = FlowIdc(h3.dst_port, h3.src_port, h2.daddr, h2.saddr, h2.npid)
if flow_emap.has(internal_flow):
flow_emap.refresh_idx(flow_emap.get(internal_flow), now)
else:
pass
else:
internal_flow = FlowIdc(h3.src_port, h3.dst_port, h2.saddr, h2.daddr, h2.npid)
if flow_emap.has(internal_flow):
flow_emap.refresh_idx(flow_emap.get(internal_flow), now)
else:
pass
from state import flow_emap
EXP_TIME = 10 * 1000
EXT_IP_ADDR = ext_ip
EXT_PORT = 1
if a_packet_received:
flow_emap.expire_all(now - EXP_TIME)
h3 = pop_header(tcpudp, on_mismatch=([], []))
h2 = pop_header(ipv4, on_mismatch=([], []))
h1 = pop_header(ether, on_mismatch=([], []))
internal_flow_id = FlowIdc(h3.src_port, h3.dst_port, h2.saddr, h2.daddr,
received_on_port, h2.npid)
if received_on_port != EXT_PORT and flow_emap.has(internal_flow_id):
idx = flow_emap.get(internal_flow_id)
flow_emap.refresh_idx(idx, now)
return ([EXT_PORT], [
ether(h1, saddr=..., daddr=...),
ipv4(h2, cksum=..., saddr=EXT_IP_ADDR),
tcpudp(h3, src_port=idx + start_port)
])
else:
pass
from state import flow_emap, int_devices
EXP_TIME = 10 * 1000
EXT_DEVICE = 1
if a_packet_received:
flow_emap.expire_all(now - EXP_TIME)
h3 = pop_header(tcpudp, on_mismatch=([], []))
h2 = pop_header(ipv4, on_mismatch=([], []))
h1 = pop_header(ether, on_mismatch=([], []))
internal_flow = FlowIdc(h3.dst_port, h3.src_port, h2.daddr, h2.saddr, h2.npid)
if received_on_port == EXT_DEVICE and flow_emap.has(internal_flow):
fl_id = flow_emap.get(internal_flow)
flow_emap.refresh_idx(fl_id, now)
out_port = vector_get(int_devices, fl_id)
return ([out_port],
[ether(h1, saddr=..., daddr=...),
ipv4(h2, cksum=...),
tcpudp(h3)])
else:
pass
from state import flow_emap, flow_id_to_backend_id, backends, backend_ip_emap
EXP_TIME = 10 * 1000
BACKEND_EXP_TIME = 3600000000 * 1000
EXT_PORT = 2
if a_packet_received:
flow_emap.expire_all(now - EXP_TIME)
backend_ip_emap.expire_all(now - BACKEND_EXP_TIME)
h3 = pop_header(tcpudp, on_mismatch=([], []))
h2 = pop_header(ipv4, on_mismatch=([], []))
h1 = pop_header(ether, on_mismatch=([], []))
packet_flow = LoadBalancedFlowc(h2.saddr, h2.daddr, h3.src_port, h3.dst_port,
h2.npid)
if received_on_port == EXT_PORT and flow_emap.has(packet_flow):
flow_id = flow_emap.get(packet_flow)
backend_id = flow_id_to_backend_id.get(flow_id)
if backend_ip_emap.has_idx(backend_id):
flow_emap.refresh_idx(flow_emap.get(packet_flow), now)
backend = backends.get(backend_id)
return ([backend.nic], [
ether(h1, saddr=..., daddr=backend.mac),
ipv4(h2, cksum=..., daddr=backend.ip),
tcpudp(h3)
])
else:
pass
else:
pass