def session_create(self, tunnel_id, session_id, peer_session_id, name):
"""
Creates a new ethernet session over the tunnel.
:param tunnel_id: Local tunnel identifier
:param session_id: Local session identifier
:param peer_session_id: Remote peer session identifier
:param name: Interface name
"""
msg = self._create_message(
L2TP_CMD_SESSION_CREATE,
[
netlink.U32Attr(L2TP_ATTR_CONN_ID, tunnel_id),
netlink.U32Attr(L2TP_ATTR_SESSION_ID, session_id),
netlink.U32Attr(L2TP_ATTR_PEER_SESSION_ID, peer_session_id),
netlink.U16Attr(L2TP_ATTR_PW_TYPE, L2TP_PWTYPE_ETH),
# TODO: Cookies.
netlink.NulStrAttr(L2TP_ATTR_IFNAME, name),
])
msg.send(self.connection)
try:
self.connection.recv()
except OSError, e:
if e.errno == errno.EEXIST:
raise L2TPSessionExists(session_id)
raise NetlinkError
def tunnel_create(self, tunnel_id, peer_tunnel_id, socket):
"""
Creates a new L2TP tunnel.
:param tunnel_id: Local tunnel identifier
:param peer_tunnel_id: Remote peer tunnel identifier
:param socket: UDP socket file descriptor
"""
msg = self._create_message(L2TP_CMD_TUNNEL_CREATE, [
netlink.U32Attr(L2TP_ATTR_CONN_ID, tunnel_id),
netlink.U32Attr(L2TP_ATTR_PEER_CONN_ID, peer_tunnel_id),
netlink.U8Attr(L2TP_ATTR_PROTO_VERSION, 3),
netlink.U16Attr(L2TP_ATTR_ENCAP_TYPE, L2TP_ENCAPTYPE_UDP),
netlink.U32Attr(L2TP_ATTR_FD, socket),
])
msg.send(self.connection)
try:
self.connection.recv()
except OSError, e:
if e.errno == errno.EEXIST:
# This tunnel identifier is already in use; make sure to remove it from
# our pool of assignable tunnel identifiers.
raise L2TPTunnelExists(tunnel_id)
raise NetlinkError
def session_modify(self, tunnel_id, session_id, mtu):
"""
Modifies an existing session.
:param tunnel_id: Local tunnel identifier
:param session_id: Local session identifier
"""
msg = self._create_message(L2TP_CMD_SESSION_MODIFY, [
netlink.U32Attr(L2TP_ATTR_CONN_ID, tunnel_id),
netlink.U32Attr(L2TP_ATTR_SESSION_ID, session_id),
netlink.U16Attr(L2TP_ATTR_MTU, mtu),
])
msg.send(self.connection)
try:
reply = self.connection.recv()
except OSError:
logger.debug(traceback.format_exc())
logger.warning("Unable to modify tunnel %d session %d!" % (tunnel_id, session_id))
