Merge branch 'Enable bpf_setsockopt() on ktls enabled sockets.'

Kui-Feng Lee says:

====================

This patchset implements a change to bpf_setsockopt() which allows
ktls enabled sockets to be used with the SOL_TCP level. This is
necessary as when ktls is enabled, it changes the function pointer of
setsockopt of the socket, which bpf_setsockopt() checks in order to
make sure that the socket is a TCP socket. Checking sk_protocol
instead of the function pointer will ensure that bpf_setsockopt() with
the SOL_TCP level still works on sockets with ktls enabled.

The major differences form v2 are:
 - Add a read() call to make sure that the FIN has arrived.
 - Remove the dependency on other test's header.

The major differences from v1 are:
 - Test with a IPv6 connect as well.
 - Use ASSERT_OK()

v2: https://lore.kernel.org/bpf/20230124181220.2871611-1-kuifeng@meta.com/
v1: https://lore.kernel.org/bpf/20230121025716.3039933-1-kuifeng@meta.com/
====================

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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