Re: Linux 2.2.5/2.2.6-pre2 does not ack some retransmitted packetst

[Taral]

On Thu, 15 Apr 1999, Taral wrote:

> Ahh... I'll take it out then. It's probably the source of the problem.
> I'll put back in my patch, which was specific to the FIN problem.
> 
> (I'll post it here too.)

Here is a patch which (maybe) corrects my FIN packet problem without
upsetting any other packets.

Taral

--- tcp_input.c.nodebug Mon Mar 29 17:37:43 1999
+++ tcp_input.c Thu Apr 15 18:39:19 1999
@@ -55,6 +55,7 @@
  *                                     work without delayed acks. 
  *             Andi Kleen:             Process packets with PSH set in the
  *                                     fast path.
+ *             Taral:                  Don't drop retransmitted FIN packets before 
+looking at ACK field.
  */
 
 #include <linux/config.h>
@@ -2190,7 +2191,7 @@
        }
 
        /* step 1: check sequence number */
-       if (!tcp_sequence(tp, TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq)) {
+       if (!tcp_sequence(tp, TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq) && 
+!(th->fin && TCP_SKB_CB(skb)->end_seq == tp->rcv_nxt)) {
                if (!th->rst) {
                        tcp_send_ack(sk);
                        goto discard;