[lwip-devel] [bug #28288] Data after FIN in oos queue

[Simon Goldschmidt]

Follow-up Comment #11, bug #28288 (project lwip):

Even case 1 is possibly solved best by keeping the seqno of a FIN (once
received, no matter if inseq or ooseq) in the pcb. We can then check any
incoming segment:
- if we already received a FIN and
- inseg has a FIN and
- these FINs have different seqnos
-> RST and abort the connection.

When trying to make up code for handling that, I stumbled accross the fact
that I didn't know / find other example code how to abort a connection in that
case. It seems we currently only have code that either closes or processes
received RSTs - I didn't find code where we abort/RST the connection ourself
due to illegal data?

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