On Sat, Jul 08, 2000 at 07:12:34PM +0400, A.N.Kuznetsov wrote:
> If new SYN is inside window, but its sequence number is
> different (it would not be not new otherwise 8)),
> connection is aborted and reset is sent.
Ok, here is a patch.
--- linux/net/ipv4/tcp_input.c Sun Jul 2 13:14:12 2000
+++ linux-work/net/ipv4/tcp_input.c Sat Jul 8 17:56:50 2000
@@ -1990,14 +1990,16 @@
flg &= __constant_htonl(0x00170000);
/* Only SYN set? */
if (flg == __constant_htonl(0x00020000)) {
- if (TCP_SKB_CB(skb)->seq == req->rcv_isn) {
- /* retransmited syn.
- */
+ __u32 seq = TCP_SKB_CB(skb)->seq;
+ /* Retransmission or out of window -> ACK */
+ if (seq == req->rcv_isn ||
+ before(seq, req->rcv_isn) ||
+ after(seq, req->rcv_isn + req->rcv_wnd)) {
req->class->rtx_syn_ack(sk, req);
- return NULL;
} else {
- return sk; /* Pass new SYN to the listen socket. */
+ req->class->send_reset(skb);
}
+ return NULL;
}
/* We know it's an ACK here */
-Andi
-
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