On Mon, Apr 17, 2000 at 03:06:32PM +0200, Hirokazu Takahashi wrote:
> Hello,
>
> I have another problem I'd like to solve.
>
> I've seen a ESTABLIED socket which have no peer.
> When a client attempt to connect to the server on linux,
> linux may release a SYN_RECV connection silently and
> does not notiy to the client.
>
>
> RFC916 says
> - A CLOSE request is made by the user. Create a packet with
> FIN set. Send it and go to the FIN-WAIT state.
>
> I think sendig FIN is required when closing SYN_RECV connections
> even if they are on a backlog-queue(sk->tp_pinfo.af_tcp.syn_wait_queue),
> but Linux releases SYN_RECV connections without anything.
> Or it would not be bad idea to send reset (RST) to the peer
> than doing nothing.
RST is not good when the SYN-RECV ACK has not been received yet -- you
risk killing innocent connections because only after the three way handshake
you're fully synchronized. FIN is not good neither. For Established sockets
we already do the right thing.
-Andi
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