From cae5178056eae94c9273c32c894a4e2c896c95cf Mon Sep 17 00:00:00 2001
From: David Woodhouse <David.Woodhouse@intel.com>
Date: Mon, 4 Feb 2013 16:01:51 +0000
Subject: [PATCH] Impose minimum MTU of 1280 bytes.

Some people have seen extremely low pMTU values from the kernel. Not sure
why, but let's impose a lower limit for now.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
(cherry picked from commit b37161f6aa355b0e134de6b582a4c7838a4be07a)
---
 cstp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cstp.c b/cstp.c
index dacb2ae2..d57d7418 100644
--- a/cstp.c
+++ b/cstp.c
@@ -144,6 +144,8 @@ static void calculate_mtu(struct openconnect_info *vpninfo, int *base_mtu, int *
 		/* Default */
 		*mtu = 1406;
 	}
+	if (*mtu < 1280)
+		*mtu = 1280;
 }
 
 static int start_cstp_connection(struct openconnect_info *vpninfo)