def recvSCCRQ(self, pkt):
"""Receive SCCRQ."""
if L2tpv3GlobalSettings.L2tpv3GlobalSettings.MustAvpsCheck is True:
ret = self.checkMustAvps(
L2tpv3ControlPacket.L2tpv3ControlPacket.SCCRQMandatoryAVPs,
pkt.avps)
if ret is not True:
self.fsm.recvBadSCCRQ()
return L2tpv3ControlPacket.L2tpv3StopCCN(
self, 2, 4, "Avp cannot handled correctly")
sccrpAvp = L2tpv3RFC3931AVPs.ControlMessageAVP(
L2tpv3RFC3931AVPs.ControlMessageAVP.SCCRP)
recvWinSize = ReceiveWinSize(
L2tpv3GlobalSettings.L2tpv3GlobalSettings.ReceiveWindowSize)
sccrp = L2tpv3ControlPacket.L2tpv3ControlPacket(
self.remoteConnID, 0, 0, (sccrpAvp, recvWinSize))
if len(pkt.avps) > 1:
for i in xrange(1, len(pkt.avps)):
avp = pkt.avps[i]
# We got a bad SCCRQ, we should send a CDN
if not avp.handleAvp(pkt, sccrp):
self.fsm.recvBadSCCRQ()
return L2tpv3ControlPacket.L2tpv3StopCCN(
self, 2, 4, "Avp cannot handled correctly")
self.fsm.recvGoodSCCRQ()
return sccrp
def CloseConnection(self):
"""Clean up the resource, including the following parts:
* sessions
* transport
* fsm
:return: none
"""
if self.connection_status == L2tpConnection.CREATED:
keys = self.sessions.keys()
for sessionId in keys:
session = self.sessions[sessionId]
if hasattr(session.fsm.fsm, 'transition'):
delattr(session.fsm.fsm, 'transition')
self.logger.debug("The session %d fsm is undergoing!!",
sessionId)
session.CloseSession()
self.removeSession(session)
# Send a StopCCN
self.transport.SendPacket(
L2tpv3ControlPacket.L2tpv3StopCCN(self, 1, 0,
"Close the connection"),
None)
# process the transport
self.transport.CloseTransport()
# remove it from the global connection DB
self.ConnectionDb.pop(
(self.remoteAddr, self.localAddr, self.localConnID))
self.connection_status = L2tpConnection.CLOSED
def recvSCCRP(self, pkt):
"""On openRPD, we will behave as an recipient, so we will not receive
SCCRP in normal case.
:param pkt:
:return:
"""
self.logger.debug("Receive a SCCRP packet")
if L2tpv3GlobalSettings.L2tpv3GlobalSettings.MustAvpsCheck is True:
ret = self.checkMustAvps(
L2tpv3ControlPacket.L2tpv3ControlPacket.SCCRPMandatoryAVPs,
pkt.avps)
if ret is not True:
self.fsm.recvBadSCCRP()
return L2tpv3ControlPacket.L2tpv3StopCCN(
self, 2, 4, "Avp cannot handled correctly")
# Get the localAssignedID from the SCCRP
remoteConnID = 0
for avp in pkt.avps:
if isinstance(avp, L2tpv3RFC3931AVPs.AssignedControlConnectionID):
remoteConnID = avp.connectionID
self.remoteConnID = remoteConnID
scccnAvp = L2tpv3RFC3931AVPs.ControlMessageAVP(
L2tpv3RFC3931AVPs.ControlMessageAVP.SCCCN)
scccn = L2tpv3ControlPacket.L2tpv3ControlPacket(
self.remoteConnID, 0, 0, (scccnAvp, ))
if len(pkt.avps) > 1:
for i in xrange(1, len(pkt.avps)):
avp = pkt.avps[i]
# We got a bad ICRQ, we should send a CDN
if not avp.handleAvp(pkt, scccn):
self.fsm.recvBadSCCRP()
return L2tpv3ControlPacket.L2tpv3StopCCN(
self, 2, 4, "Avp cannot handled correctly")
self.fsm.recvGoodSCCRP()
return scccn