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TCP: An RST recevied suring the 3-way handshake requires a little more clean-up

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This commit is contained in:
Gregory Nutt
2017-05-15 08:10:43 -06:00
parent 34e68a569b
commit 914c5dad0c
2 changed files with 38 additions and 4 deletions
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40
net/tcp/tcp_input.c
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@@ -314,10 +314,44 @@ found:
if ((tcp->flags & TCP_RST) != 0)
{
conn->tcpstateflags = TCP_CLOSED;
nwarn("WARNING: RESET - TCP state: TCP_CLOSED\n");
FAR struct tcp_conn_s *listener = NULL;
/* An RST received during the 3-way connection handshake requires
* little more clean-up.
*/
if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_SYN_RCVD)
{
conn->tcpstateflags = TCP_CLOSED;
nwarn("WARNING: RESET in TCP_SYN_RCVD\n");
/* Notify the listerner for connection of the reset event */
listener = tcp_findlistener(conn->lport);
/* We must free this TCP connection structure, this connection
* will never be established.
*/
tcp_free(conn);
}
else
{
conn->tcpstateflags = TCP_CLOSED;
nwarn("WARNING: RESET TCP state: TCP_CLOSED\n");
/* Notify this connection of the reset event */
listener = conn;
}
/* Perform the TCP_ABORT callback and drop the packet */
if (listener != NULL)
{
(void)tcp_callback(dev, listener, TCP_ABORT);
}
(void)tcp_callback(dev, conn, TCP_ABORT);
goto drop;
}