Parsing of TCA_EMATCH_TREE_LIST is broken

[ffourcot]

DEBUG get(): message {'attrs': [('TCA_KIND', 'basic'), ('UNKNOWN', {'header': {'length': 8, 'type': 11}}), ('TCA_OPTIONS', {'attrs': [('TCA_BASIC_CLASSID', 65536), ('UNKNOWN', {'header': {'length': 20, 'type': 5}}), ('TCA_BASIC_ACT', {'attrs': [('TCA_ACT_PRIO_1', {'attrs': [('TCA_ACT_KIND', 'skbedit'), ('TCA_ACT_STATS', {'attrs': [('TCA_STATS_BASIC', {'bytes': 0, 'packets': 0}), ('UNKNOWN', {'header': {'length': 20, 'type': 7}}), ('TCA_STATS_QUEUE', {'qlen': 0, 'backlog': 0, 'drops': 0, 'requeues': 0, 'overlimits': 0})]}), ('TCA_ACT_OPTIONS', {'attrs': [('TCA_SKBEDIT_PARMS', {'index': 1, 'capab': 0, 'action': 3, 'refcnt': 1, 'bindcnt': 1}), ('TCA_SKBEDIT_PRIORITY', 65539), ('TCA_SKBEDIT_TM', {'install': 14, 'lastuse': 14, 'expires': 0, 'firstuse': 0})]})]})]}), ('TCA_BASIC_EMATCHES', {'attrs': [('TCA_EMATCH_TREE_HDR', {'nmatches': 1, 'progid': 0}), ('TCA_EMATCH_TREE_LIST', b'\x14\x00\x02\x00\x10\x00\x01\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x01\x02')]})]})], 'header': {'length': 280, 'type': 44, 'flags': 2, 'sequence_number': 256, 'pid': 2849249314, 'error': None}, 'family': 0, 'pad1': 0, 'pad2': 0, 'index': 10, 'handle': 1, 'parent': 65536, 'info': 66304, 'event': 'RTM_NEWTFILTER'}
2025-01-14 15:41:08,384 /root/.local/lib/python3.11/site-packages/pytest/__main__.py:1797[wibox/10/]: WARNING try_to_decode(): decoding TCA_EMATCH_TREE_LIST
2025-01-14 15:41:08,385 /root/.local/lib/python3.11/site-packages/pytest/__main__.py:1798[wibox/10/]: WARNING try_to_decode(): Traceback (most recent call last):
  File "pyroute2/netlink/__init__.py", line 1794, in try_to_decode
    cell.decode()
  File "pyroute2/netlink/rtnl/tcmsg/cls_basic.py", line 216, in decode
    nla.decode(self)
  File "pyroute2/netlink/__init__.py", line 2374, in decode
    nla_base.decode(self)
  File "pyroute2/netlink/__init__.py", line 1172, in decode
    cell.decode()
  File "pyroute2/netlink/rtnl/tcmsg/cls_basic.py", line 227, in decode
    self['opt'] = self.parse_ematch_options(self, data)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "pyroute2/netlink/rtnl/tcmsg/common_ematch.py", line 53, in parse_ematch_options
    ret.decode()
  File "pyroute2/netlink/__init__.py", line 1176, in decode
    self.ft_decode(offset)
    ^^^^^^^^^^^^^^
AttributeError: 'data' object has no attribute 'ft_decode'

I do not have a simple "how to reproduce" for now, tell me if you need more details

[svinota]

Expect the fix latest on Friday.

Sorry for being late with that.

[svinota]

Nope, it takes too much time to reproduce, rebuilding the message from the struct above. May I ask you to send me the binary packet data from the first line?

Either put there logging to dump msg.data or like that.