From: Rick Jones <[EMAIL PROTECTED]>
Date: Mon, 10 Sep 2007 11:42:18 -0700
> I've been digging around to see about inducing /proc/net/tcp to show
> some "interesting" things for listen sockets (eg backlog depth, its max,
> and dropped connection requests). While there I've noticed that both
> tcp_v[46]_syn_recv_sock and tcp_v[46]conn_request both check that the
> listen queue is full, but only tcp_v[46]_syn_recv_sock increments some
> mib stats for dropped connection requests.
They are checking two different things.
tcp_v{4,6}_conn_request is checking whether we are hitting the limit
for allowing the initial SYN and creating a new embryonic mini-socket.
Exceeding that is not a listen overflow.
tcp_v{4,6}_syn_recv_sock() is processing the end of the 3-way
handshake and wants to create a full established state socket to queue
into the listening parent. This is checking the listening socket
queue limits, and indeed is a listen queue overflow if exceeded.
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