From: Michael Brown <mcb30@etherboot.org>
Date: Wed, 27 Dec 2006 23:44:05 +0000 (+0000)
Subject: Don't send a second FIN if we receive a FIN while in FIN_WAIT_2
X-Git-Tag: v0.9.3~822
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=be31970e36cb7fee49d81e8b0455cd3deac84390;p=thirdparty%2Fipxe.git

Don't send a second FIN if we receive a FIN while in FIN_WAIT_2
---

diff --git a/src/net/tcp.c b/src/net/tcp.c
index 9cb2cf7eb..1b5f76c07 100644
--- a/src/net/tcp.c
+++ b/src/net/tcp.c
@@ -573,13 +573,14 @@ static int tcp_rx_fin ( struct tcp_connection *conn, uint32_t seq ) {
 	if ( ( conn->rcv_ack - seq ) > 0 )
 		return 0;
 
-	/* Mark FIN as received and send our own FIN */
-	conn->tcp_state |= ( TCP_STATE_RCVD ( TCP_FIN ) |
-			     TCP_STATE_SENDING ( TCP_FIN ) );
-
-	/* Acknowledge FIN */
+	/* Mark FIN as received and acknowledge it */
+	conn->tcp_state |= TCP_STATE_RCVD ( TCP_FIN );
 	conn->rcv_ack++;
 
+	/* If we haven't already sent our FIN, send a FIN */
+	if ( ! ( conn->tcp_state & TCP_STATE_ACKED ( TCP_FIN ) ) )
+		conn->tcp_state |= TCP_STATE_SENDING ( TCP_FIN );
+
 	/* Break association with application */
 	tcp_disassociate ( conn );