RE: [PATCH bpf-next v7 04/11] bpf, sockmap: Allow inserting listening TCP sockets into sockmap

Jakub Sitnicki wrote:

In order for sockmap/sockhash types to become generic collections for
storing TCP sockets we need to loosen the checks during map update, while
tightening the checks in redirect helpers.

Currently sock{map,hash} require the TCP socket to be in established state,
which prevents inserting listening sockets.

Change the update pre-checks so the socket can also be in listening state.

Since it doesn't make sense to redirect with sock{map,hash} to listening
sockets, add appropriate socket state checks to BPF redirect helpers too.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
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Acked-by: John Fastabend <john.fastabend@gmail.com>