[TCP]: sysctl to allow TCP window > 32767 sans wscale

Back in the dark ages, we had to be conservative and only allow 15-bit
window fields if the window scale option was not negotiated.  Some
ancient stacks used a signed 16-bit quantity for the window field of
the TCP header and would get confused.

Those days are long gone, so we can use the full 16-bits by default
now.

There is a sysctl added so that we can still interact with such old
stacks

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 6 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 518e568b53f3..9d79546d384e 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -45,6 +45,11 @@
 /* People can turn this off for buggy TCP's found in printers etc. */
 int sysctl_tcp_retrans_collapse = 1;
 
+/* People can turn this on to  work with those rare, broken TCPs that
+ * interpret the window field as a signed quantity.
+ */
+int sysctl_tcp_workaround_signed_windows = 0;
+
 /* This limits the percentage of the congestion window which we
  * will allow a single TSO frame to consume.  Building TSO frames
  * which are too large can cause TCP streams to be bursty.
@@ -177,12 +182,18 @@ void tcp_select_initial_window(int __space, __u32 mss,
                 space = (space / mss) * mss;
 
         /* NOTE: offering an initial window larger than 32767
-         * will break some buggy TCP stacks. We try to be nice.
-         * If we are not window scaling, then this truncates
-         * our initial window offering to 32k. There should also
-         * be a sysctl option to stop being nice.
+         * will break some buggy TCP stacks. If the admin tells us
+         * it is likely we could be speaking with such a buggy stack
+         * we will truncate our initial window offering to 32K-1
+         * unless the remote has sent us a window scaling option,
+         * which we interpret as a sign the remote TCP is not
+         * misinterpreting the window field as a signed quantity.
          */
-        (*rcv_wnd) = min(space, MAX_TCP_WINDOW);
+        if (sysctl_tcp_workaround_signed_windows)
+                (*rcv_wnd) = min(space, MAX_TCP_WINDOW);
+        else
+                (*rcv_wnd) = space;
+
         (*rcv_wscale) = 0;
         if (wscale_ok) {
                 /* Set window scaling on max possible window
@@ -241,7 +252,7 @@ static u16 tcp_select_window(struct sock *sk)
         /* Make sure we do not exceed the maximum possible
          * scaled window.
          */
-        if (!tp->rx_opt.rcv_wscale)
+        if (!tp->rx_opt.rcv_wscale && sysctl_tcp_workaround_signed_windows)
                 new_win = min(new_win, MAX_TCP_WINDOW);
         else
                 new_win = min(new_win, (65535U << tp->rx_opt.rcv_wscale));