ref: 197ff3ac2f4fe9be7eefc9c8409cee04e267b04a
parent: d7aa56c073abea325fb52821b49fa453bacd3922
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Wed May 22 18:20:31 EDT 2019
devip: if the server does not support TCP ws option, disable window scaling (thanks joe9) if the server responds without a window scale option in its syn-ack, disable window scaling alltogether as both sides need to understand the option.
--- a/sys/src/9/ip/tcp.c
+++ b/sys/src/9/ip/tcp.c
@@ -3031,6 +3031,12 @@
tpriv->stats[Mss] = tcb->mss;
}
+ /* if the server does not support ws option, disable window scaling */
+ if(seg->ws == 0){+ tcb->scale = 0;
+ tcb->snd.scale = 0;
+ }
+
tcb->snd.wnd = seg->wnd;
initialwindow(tcb);
}