def _build_meta(self,
ia=None,
host=None,
path=None,
port=0,
reuse=False,
one_hop=False):
if ia is None:
ia = self.addr.isd_as
if path is None:
path = SCIONPath()
if not one_hop:
return self._DefaultMeta.from_values(ia,
host,
path,
port=port,
reuse=reuse)
# One hop path extension in handled in a different way in TCP and UDP
if self._DefaultMeta == TCPMetadata:
return TCPMetadata.from_values(ia,
host,
path,
port=port,
reuse=reuse,
flags=TCPFlags.ONEHOPPATH)
return UDPMetadata.from_values(ia,
host,
path,
port=port,
reuse=reuse,
ext_hdrs=[OneHopPathExt()])
def _mk_prop_pcb_meta(self, pcb, dst_ia, egress_if):
ts = pcb.get_timestamp()
asm = self._create_asm(pcb.p.ifID, egress_if, ts, pcb.last_hof())
if not asm:
return None, None
pcb.add_asm(asm)
pcb.sign(self.signing_key)
one_hop_path = self._create_one_hop_path(egress_if)
if self.DefaultMeta == TCPMetadata:
return pcb, self.DefaultMeta.from_values(ia=dst_ia,
host=SVCType.BS_A,
path=one_hop_path,
flags=TCPFlags.ONEHOPPATH)
return pcb, UDPMetadata.from_values(ia=dst_ia,
host=SVCType.BS_A,
path=one_hop_path,
ext_hdrs=[OneHopPathExt()])
def _create_extensions(self):
return [OneHopPathExt.from_values()]
def _create_extensions(self):
exts = []
exts.append(OneHopPathExt.from_values())
exts.append(SCMPExt.from_values(error=False))
return exts
def _create_extensions(self):
exts = []
for i in range(MAX_HOPBYHOP_EXT + 1):
exts.append(OneHopPathExt.from_values())
return exts