LLDP: add IEEE 802.1Q and 802.1AX org-specific TLVs

[ali-keys]

Hi everyone,

This PR adds 15 new org-specific TLVs for IEEE 802.1Q:

• Port VLAN ID (PVID)
• Port and Protocol VLAN ID (PPVID)
• VLAN Name
• Protocol Identity
• VID Usage Digest
• Management VID
• Link Aggregation (this TLV is from 802.1AX)
• Congestion Notification
• ETS Configuration
• ETS Recommendation
• PFC Configuration
• Application Priority
• EVB
• CDCP
• Application VLAN

First, I wanted to implement only the ones that I needed (VLAN stuff), but then decided to implement all of them.
The code has been written mostly by AI. I've reviewed and corrected every line of it.

[polydroi]

Thanks for the PR.

Could you please check if it is possible to add interoperability tests with existing tools or libraries, such as lldpd, to the unit tests.

[ali-keys]

Thanks for the PR.

Could you please check if it is possible to add interoperability tests with existing tools or libraries, such as lldpd, to the unit tests.

Hi Nils,

by interoperability tests you mean: Making a real environment -> capturing everything -> writing tests based on the pcaps to make sure it gets parsed correctly? Like the last test (Wireshark sample: Summit300-48*)?

* https://github.com/secdev/scapy/pull/4970/changes#diff-cd75a14a55c0b70a338abe750de68641d9a5c2c43acee32f99291161bb66100eR1689-R1742

[polydroi]

No, those tests are also important, but if possible I have something like this in mind.

Start lldpd with a certain configuration in a subprocess,
Start your test code that interacts with lldpd. Evaluate the test.
Stop the subprocess.

In this way we can automatically verify the interaction with a real world application/libray.