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[dhcp] Use PXE byte ordering for UUID in DHCP option 97

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The PXE spec does not specify a byte ordering for UUIDs, but RFC4578
suggests that it follows the EFI spec, in which the first three fields
are little-endian.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2013-03-20 00:54:42 +00:00
parent 9e896d0eea
commit a9b63ecda5
1 changed files with 8 additions and 1 deletions
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9
src/net/udp/dhcp.c
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@ -1041,10 +1041,17 @@ int dhcp_create_request ( struct dhcp_packet *dhcppkt,
return rc;
}
/* Add client UUID, if we have one. Required for PXE. */
/* Add client UUID, if we have one. Required for PXE. The
* PXE spec does not specify a byte ordering for UUIDs, but
* RFC4578 suggests that it follows the EFI spec, in which the
* first three fields are little-endian.
*/
client_uuid.type = DHCP_CLIENT_UUID_TYPE;
if ( ( len = fetch_uuid_setting ( NULL, &uuid_setting,
&client_uuid.uuid ) ) >= 0 ) {
__bswap_32s ( &client_uuid.uuid.canonical.a );
__bswap_16s ( &client_uuid.uuid.canonical.b );
__bswap_16s ( &client_uuid.uuid.canonical.c );
if ( ( rc = dhcppkt_store ( dhcppkt, DHCP_CLIENT_UUID,
&client_uuid,
sizeof ( client_uuid ) ) ) != 0 ) {