From 79691961bae9a0eaf261615aeff472b5d186dfc0 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 31 Jul 2007 03:32:22 +0100
Subject: Add identifier for the network device into the DHCP request.

---
 src/net/udp/dhcp.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/net')

diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index b82db1a42..f8f59e2e4 100644
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -24,6 +24,7 @@
 #include <byteswap.h>
 #include <gpxe/if_ether.h>
 #include <gpxe/netdevice.h>
+#include <gpxe/device.h>
 #include <gpxe/xfer.h>
 #include <gpxe/open.h>
 #include <gpxe/job.h>
@@ -480,6 +481,16 @@ static struct dhcp_option_block * dhcp_parse ( const struct dhcphdr *dhcphdr,
  *
  */
 
+/** DHCP network device descriptor */
+struct dhcp_netdev_desc {
+	/** Bus type ID */
+	uint8_t type;
+	/** Vendor ID */
+	uint16_t vendor;
+	/** Device ID */
+	uint16_t device;
+} __attribute__ (( packed ));
+
 /**
  * Create DHCP request
  *
@@ -495,6 +506,8 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
 			  struct dhcp_option_block *options,
 			  void *data, size_t max_len,
 			  struct dhcp_packet *dhcppkt ) {
+	struct device_description *desc = &netdev->dev->desc;
+	struct dhcp_netdev_desc dhcp_desc;
 	int rc;
 
 	/* Create DHCP packet */
@@ -531,6 +544,18 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
 		}
 	}
 
+	/* Add options to identify the network device */
+	dhcp_desc.type = desc->bus_type;
+	dhcp_desc.vendor = htons ( desc->vendor );
+	dhcp_desc.device = htons ( desc->device );
+	if ( ( rc = set_dhcp_packet_option ( dhcppkt, DHCP_EB_BUS_ID,
+					     &dhcp_desc,
+					     sizeof ( dhcp_desc ) ) ) != 0 ) {
+		DBG ( "DHCP could not set bus ID option: %s\n",
+		      strerror ( rc ) );
+		return rc;
+	}
+
 	return 0;
 }
 
-- 
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