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--- linux-2.0.37/net/ipv4/tcp_input.c.orig Fri Jul 23 17:25:14 1999
+++ linux/net/ipv4/tcp_input.c Fri Jul 23 17:29:43 1999
@@ -2764,7 +2764,18 @@
kfree_skb(skb, FREE_READ);
return 0;
}
-
+
+ if (sk->state==TCP_SYN_RECV && th->ack && skb->ack_seq!=sk->sent_seq)
+ {
+ /*
+ * Quick fix to detect too small ack_seq
+ * in 3rd packet of 3ws and force a RST segment.
+ */
+ tcp_send_reset(daddr, saddr, th,sk->prot, opt, dev,0,255);
+ kfree_skb(skb, FREE_READ);
+ return 0;
+ }
+
rfc_step6:
/*
* If the accepted buffer put us over our queue size we
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