get_if_addr6 breaks when using conf.layers.filter

[wardz]

Brief description

After applying a new filter with conf.layers.filter(), all subsequent calls to get_if_addr6 fail with an exception. (ipv4 get_if_addr continues to work.) This issue occurs for me on Linux and macOS but not on Windows.

Not sure if ipv6 requires some extra undocumented layers to always be enabled or if this is a bug?

Scapy version

2.6.1

Python version

3.10 and 3.11

Operating system

Ubuntu 22.04.5 LTS

Additional environment information

No response

How to reproduce

from scapy.all import conf, IP, IPv6, get_if_addr6

print(get_if_addr6("eth0")) # Works fine

conf.layers.filter([IP, IPv6]) # Filter itself here can be anything, doesn't matter

print(get_if_addr6("eth0")) # Throws exception

Actual result

None
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 480, in __getattr__
    fld, v = self.getfield_and_val(attr)
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 475, in getfield_and_val
    raise ValueError
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 480, in __getattr__
    fld, v = self.getfield_and_val(attr)
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 475, in getfield_and_val
    raise ValueError
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/mnt/c/Users/wardz/test.py", line 32, in <module>
    print(get_if_addr6("eth0")) # Throws exception
  File "/usr/local/lib/python3.10/dist-packages/scapy/arch/__init__.py", line 105, in get_if_addr6
    return next((x[0] for x in in6_getifaddr()
  File "/usr/local/lib/python3.10/dist-packages/scapy/arch/linux/rtnetlink.py", line 846, in in6_getifaddr
    ips = _get_ips(af_family=socket.AF_INET6)
  File "/usr/local/lib/python3.10/dist-packages/scapy/arch/linux/rtnetlink.py", line 774, in _get_ips
    ifindex = msg.ifa_index
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 482, in __getattr__
    return self.payload.__getattr__(attr)
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 482, in __getattr__
    return self.payload.__getattr__(attr)
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 480, in __getattr__
    fld, v = self.getfield_and_val(attr)
  File "/usr/local/lib/python3.10/dist-packages/scapy/packet.py", line 1886, in getfield_and_val
    raise AttributeError(attr)
AttributeError: ifa_index

Expected result

None
None

Related resources

No response

[gpotter2]

Thanks for the report & sorry again for the delay. This is fixed in #4755