Merge branch 'bpf-sockmap-estab-fixes'

John Fastabend says:

====================
Eric noted that using the close callback is not sufficient
to catch all transitions from ESTABLISHED state to a LISTEN
state. So this series does two things. First, only allow
adding socks in ESTABLISH state and second use unhash callback
to catch tcp_disconnect() transitions.

v2: added check for ESTABLISH state in hash update sockmap as well
v3: Do not release lock from unhash in error path, no lock was
    used in the first place. And drop not so useful code comments
v4: convert,
	if (unhash()) return unhash(); return
     to if (unhash()) unhash(); return;

Thanks for reviewing Yonghong I carried your ACKs forward.
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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