Jakub Sitnicki wrote:

SOCKMAP now supports storing references to listening sockets. Nothing keeps
us from using it as an array of sockets to select from in SK_REUSEPORT
programs.

Whitelist the map type with the BPF helper for selecting socket.

The restriction that the socket has to be a member of a reuseport group
still applies. Socket from a SOCKMAP that does not have sk_reuseport_cb set
is not a valid target and we signal it with -EINVAL.

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