[U-Boot] [PATCH v2 2/3] net: bootp: add PXE/RFC 4578 DHCP options support

[Jason Hobbs]

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 at calxeda.com>
---
Changes for v2:
- Use common.h to get uuid_str_to_bin prototype
---
 net/bootp.c |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/net/bootp.c b/net/bootp.c
index 4db63cb..06ff598 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;
-- 
1.7.0.4