[dhcp] Ensure message type is first DHCP option

Apparently, the DHCP relay logic on a Nortel 470-48T layer 2 switch
cares about the order of DHCP options.  Specifically, it requires
that the DHCP message type option be the first option present in the
DHCP packet.  We achieve this by having this option appear first in
our dhcp_request_options_data array, which pre-populates DHCP
requests.

Signed-off-by: Marty Connor <mdc@etherboot.org>

diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index 17e543acbdd9dbbd6925a27c77daa840f1c65dda..b0dd9529212be80d0f4c79e7e451747dadffe8e8 100644 (file)
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -71,6 +71,7 @@ static const uint8_t dhcp_op[] = {
 
 /** Raw option data for options common to all DHCP requests */
 static uint8_t dhcp_request_options_data[] = {
+       DHCP_MESSAGE_TYPE, DHCP_BYTE ( 0 ),
        DHCP_MAX_MESSAGE_SIZE,
        DHCP_WORD ( ETH_MAX_MTU - 20 /* IP header */ - 8 /* UDP header */ ),
        DHCP_CLIENT_ARCHITECTURE, DHCP_WORD ( 0 ),