From 6941793416474f68f3dcbbf55258ac35de65026a Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Wed, 21 Jan 2009 03:43:26 +0000
Subject: [dhcp] Add preliminary support for PXE Boot Servers

Some PXE configurations require us to perform a third DHCP transaction
(in addition to the real DHCP transaction and the ProxyDHCP
transaction) in order to retrieve information from a "Boot Server".

This is an experimental implementation, since the actual behaviour is
not well specified in the PXE spec.
---
 src/include/gpxe/dhcp.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/include')

diff --git a/src/include/gpxe/dhcp.h b/src/include/gpxe/dhcp.h
index cd3964c55..a0a09412a 100644
--- a/src/include/gpxe/dhcp.h
+++ b/src/include/gpxe/dhcp.h
@@ -81,6 +81,9 @@ struct dhcp_packet;
 /** Vendor encapsulated options */
 #define DHCP_VENDOR_ENCAP 43
 
+/** PXE boot server multicast address */
+#define DHCP_PXE_BOOT_SERVER_MCAST DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 7 )
+
 /** Requested IP address */
 #define DHCP_REQUESTED_ADDRESS 50
 
@@ -480,6 +483,9 @@ struct dhcphdr {
 /** Settings block name used for ProxyDHCP responses */
 #define PROXYDHCP_SETTINGS_NAME "proxydhcp"
 
+/** Setting block name used for BootServerDHCP responses */
+#define BSDHCP_SETTINGS_NAME "bs"
+
 extern int dhcp_create_packet ( struct dhcp_packet *dhcppkt,
 				struct net_device *netdev, uint8_t msgtype,
 				struct dhcp_options *options, 
-- 
cgit v1.2.3-55-g7522