From 6e1450f3095c90cf7119a4dbc8e6710daf988444 Mon Sep 17 00:00:00 2001
From: lpleahy <lpleahy@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 29 Jun 2012 00:46:58 +0000
Subject: [PATCH] Choose a better subnet mask value for the IPv4 address.

Signed-off-by: lpleahy

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13479 6f19259b-4bc3-4df7-8a09-765794883524
---
 StdLib/EfiSocketLib/Ip4.c  | 6 +++---
 StdLib/EfiSocketLib/Tcp4.c | 6 +++---
 StdLib/EfiSocketLib/Udp4.c | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/StdLib/EfiSocketLib/Ip4.c b/StdLib/EfiSocketLib/Ip4.c
index 5a0f5284f5..80f328a8dd 100644
--- a/StdLib/EfiSocketLib/Ip4.c
+++ b/StdLib/EfiSocketLib/Ip4.c
@@ -143,9 +143,9 @@ EslIp4LocalAddressSet (
     }
     else {
       pConfig->SubnetMask.Addr[0] = 0xff;
-      pConfig->SubnetMask.Addr[1] = 0xff;
-      pConfig->SubnetMask.Addr[2] = 0xff;
-      pConfig->SubnetMask.Addr[3] = 0xff;
+      pConfig->SubnetMask.Addr[1] = ( 128 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
+      pConfig->SubnetMask.Addr[2] = ( 192 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
+      pConfig->SubnetMask.Addr[3] = ( 224 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
     }
   }
 
diff --git a/StdLib/EfiSocketLib/Tcp4.c b/StdLib/EfiSocketLib/Tcp4.c
index 145186bb36..34e60e2a7f 100644
--- a/StdLib/EfiSocketLib/Tcp4.c
+++ b/StdLib/EfiSocketLib/Tcp4.c
@@ -1157,9 +1157,9 @@ EslTcp4LocalAddressSet (
     }
     else {
       pAccessPoint->SubnetMask.Addr[0] = 0xff;
-      pAccessPoint->SubnetMask.Addr[1] = 0xff;
-      pAccessPoint->SubnetMask.Addr[2] = 0xff;
-      pAccessPoint->SubnetMask.Addr[3] = 0xff;
+      pAccessPoint->SubnetMask.Addr[1] = ( 128 <= pAccessPoint->StationAddress.Addr[0]) ? 0xff : 0;
+      pAccessPoint->SubnetMask.Addr[2] = ( 192 <= pAccessPoint->StationAddress.Addr[0]) ? 0xff : 0;
+      pAccessPoint->SubnetMask.Addr[3] = ( 224 <= pAccessPoint->StationAddress.Addr[0]) ? 0xff : 0;
     }
 
     //
diff --git a/StdLib/EfiSocketLib/Udp4.c b/StdLib/EfiSocketLib/Udp4.c
index ae67c4e8c5..026f850377 100644
--- a/StdLib/EfiSocketLib/Udp4.c
+++ b/StdLib/EfiSocketLib/Udp4.c
@@ -131,9 +131,9 @@ EslUdp4LocalAddressSet (
     }
     else {
       pConfig->SubnetMask.Addr[0] = 0xff;
-      pConfig->SubnetMask.Addr[1] = 0xff;
-      pConfig->SubnetMask.Addr[2] = 0xff;
-      pConfig->SubnetMask.Addr[3] = 0xff;
+      pConfig->SubnetMask.Addr[1] = ( 128 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
+      pConfig->SubnetMask.Addr[2] = ( 192 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
+      pConfig->SubnetMask.Addr[3] = ( 224 <= pConfig->StationAddress.Addr[0]) ? 0xff : 0;
     }
 
     //
-- 
2.39.2