From b4700b8767c0b62526794c0b7beff6d02284fa55 Mon Sep 17 00:00:00 2001
From: Jason Hobbs <jason.hobbs@calxeda.com>
Date: Wed, 29 Jun 2011 11:58:29 -0500
Subject: net: bootp: add PXE/RFC 4578 DHCP options support

These options are required to be present in RFC 4578 compliant DHCP
requests. They give more information to DHCP servers to allow serving
different DHCP responses to different systems based on client
architecture, client capabilities, UUID, or vendor.

Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>
---
 net/bootp.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/net/bootp.c b/net/bootp.c
index 4db63cbbe..06ff5982d 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -360,6 +360,11 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R
 {
 	u8 *start = e;
 	u8 *cnt;
+#if defined(CONFIG_BOOTP_PXE)
+	char *uuid;
+	size_t vci_strlen;
+	u16 clientarch;
+#endif
 
 #if defined(CONFIG_BOOTP_VENDOREX)
 	u8 *x;
@@ -414,6 +419,37 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R
 	}
 #endif
 
+#if defined(CONFIG_BOOTP_PXE)
+	clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
+	*e++ = 93;	/* Client System Architecture */
+	*e++ = 2;
+	*e++ = (clientarch >> 8) & 0xff;
+	*e++ = clientarch & 0xff;
+
+	*e++ = 94;	/* Client Network Interface Identifier */
+	*e++ = 3;
+	*e++ = 1;	/* type field for UNDI */
+	*e++ = 0;	/* major revision */
+	*e++ = 0;	/* minor revision */
+
+	uuid = getenv("pxeuuid");
+
+	if (uuid) {
+		*e++ = 97;	/* Client Machine Identifier */
+		*e++ = 17;
+		*e++ = 0;	/* type 0 - UUID */
+
+		uuid_str_to_bin(uuid, e);
+		e += 16;
+	}
+
+	*e++ = 60;	/* Vendor Class Identifier */
+	vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING);
+	*e++ = vci_strlen;
+	memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen);
+	e += vci_strlen;
+#endif
+
 #if defined(CONFIG_BOOTP_VENDOREX)
 	if ((x = dhcp_vendorex_prep (e)))
 		return x - start;
-- 
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