def __enter__(self):
self.conntrack_handler = nfct.nfct_open(
nl_constants.NFNL_SUBSYS_CTNETLINK, nl_constants.CONNTRACK)
if not self.conntrack_handler:
LOG.critical("Failed to open new conntrack handler")
raise exceptions.CTZoneExhaustedError()
return self
def delete_entries(self, entries):
conntrack = nfct.nfct_new()
try:
for entry in entries:
self._set_attributes(conntrack, entry)
self._query(nl_constants.NFCT_Q_DESTROY, conntrack)
except Exception as e:
LOG.critical("Failed to delete conntrack entries %s", e)
raise exceptions.CTZoneExhaustedError()
finally:
nfct.nfct_destroy(conntrack)
def _find_open_zone(self):
# call set to dedup because old ports may be mapped to the same zone.
zones_in_use = sorted(set(self._device_zone_map.values()))
if not zones_in_use:
return ZONE_START
# attempt to increment onto the highest used zone first. if we hit the
# end, go back and look for any gaps left by removed devices.
last = zones_in_use[-1]
if last < MAX_CONNTRACK_ZONES:
return max(last + 1, ZONE_START)
for index, used in enumerate(zones_in_use):
if used - index != ZONE_START:
# gap found, let's use it!
return index + ZONE_START
# conntrack zones exhausted :( :(
raise exceptions.CTZoneExhaustedError()