[dhcp] Add generic facility for using cached network settings

[people/cooldavid/gpxe.git] / src / include / gpxe / dhcp.h

diff --git a/src/include/gpxe/dhcp.h b/src/include/gpxe/dhcp.h
index 2d9f885..ebfe8ed 100644 (file)
--- a/src/include/gpxe/dhcp.h
+++ b/src/include/gpxe/dhcp.h
@@ -16,6 +16,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <gpxe/tables.h>
 #include <gpxe/uuid.h>
 #include <gpxe/netdevice.h>
 #include <gpxe/tables.h>
 #include <gpxe/uuid.h>
 #include <gpxe/netdevice.h>

+#include <gpxe/uaccess.h>

 
 struct job_interface;
 struct dhcp_options;
 
 struct job_interface;
 struct dhcp_options;


@@ -332,6 +333,16 @@ struct dhcp_netdev_desc {
        uint16_t device;
 } __attribute__ (( packed ));
 
        uint16_t device;
 } __attribute__ (( packed ));
 

+/** Use cached network settings
+ *
+ * Cached network settings may be available from a prior DHCP request
+ * (if running as a PXE NBP), non-volatile storage on the NIC, or
+ * settings set via the command line or an embedded image. If this
+ * flag is not set, it will be assumed that those sources are
+ * insufficient and that DHCP should still be run when autobooting.
+ */
+#define DHCP_EB_USE_CACHED DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0xb2 )
+

 /** BIOS drive number
  *
  * This is the drive number for a drive emulated via INT 13.  0x80 is
 /** BIOS drive number
  *
  * This is the drive number for a drive emulated via INT 13.  0x80 is


@@ -615,4 +626,12 @@ extern int start_dhcp ( struct job_interface *job, struct net_device *netdev );
 extern int start_pxebs ( struct job_interface *job, struct net_device *netdev,
                         unsigned int pxe_type );
 
 extern int start_pxebs ( struct job_interface *job, struct net_device *netdev,
                         unsigned int pxe_type );
 

+/* In environments that can provide cached DHCP packets, this function
+ * should look for such a packet and call store_cached_dhcpack() with
+ * it if it exists.
+ */
+__weak_decl ( void, get_cached_dhcpack, ( void ), (), );
+
+extern void store_cached_dhcpack ( userptr_t data, size_t len );
+

 #endif /* _GPXE_DHCP_H */
 #endif /* _GPXE_DHCP_H */