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[pxe] Skip PXE boot server discovery if directed to do so 

Option 43.6 can direct us to skip PXE boot server discovery and just
perform a standard DHCP filename boot.
This commit is contained in:
Michael Brown 2009-02-03 02:46:06 +00:00
parent 4b276b8df9
commit ff2b308506
2 changed files with 30 additions and 6 deletions
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15
src/include/gpxe/dhcp.h
View File

@ -82,6 +82,21 @@ struct dhcp_packet;
/** Vendor encapsulated options */
#define DHCP_VENDOR_ENCAP 43
/** PXE boot server discovery control */
#define DHCP_PXE_DISCOVERY_CONTROL DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 6 )
/** PXE boot server discovery control bits */
enum dhcp_pxe_discovery_control {
/** Inhibit broadcast discovery */
PXEBS_NO_BROADCAST = 1,
/** Inhibit multicast discovery */
PXEBS_NO_MULTICAST = 2,
/** Accept only servers in DHCP_PXE_BOOT_SERVERS list */
PXEBS_NO_UNKNOWN_SERVERS = 4,
/** Skip discovery if filename present */
PXEBS_SKIP = 8,
};
/** PXE boot server multicast address */
#define DHCP_PXE_BOOT_SERVER_MCAST DHCP_ENCAP_OPT ( DHCP_VENDOR_ENCAP, 7 )

21
src/usr/autoboot.c
View File

@ -167,9 +167,15 @@ int boot_root_path ( const char *root_path ) {
* @ret rc Return status code
*/
static int netboot ( struct net_device *netdev ) {
struct setting tmp_setting = { .name = NULL };
struct setting vendor_class_id_setting
= { .tag = DHCP_VENDOR_CLASS_ID };
struct setting pxe_discovery_control_setting
= { .tag = DHCP_PXE_DISCOVERY_CONTROL };
struct setting pxe_boot_menu_setting
= { .tag = DHCP_PXE_BOOT_MENU };
char buf[256];
struct in_addr next_server;
unsigned int pxe_discovery_control;
int rc;
/* Open device and display device status */
@ -195,12 +201,15 @@ static int netboot ( struct net_device *netdev ) {
if ( rc != ENOENT )
return rc;
/* Try PXE menu boot, if we have PXE menu options */
tmp_setting.tag = DHCP_VENDOR_CLASS_ID;
fetch_string_setting ( NULL, &tmp_setting, buf, sizeof ( buf ) );
tmp_setting.tag = DHCP_PXE_BOOT_MENU;
/* Try PXE menu boot, if applicable */
fetch_string_setting ( NULL, &vendor_class_id_setting,
buf, sizeof ( buf ) );
pxe_discovery_control =
fetch_uintz_setting ( NULL, &pxe_discovery_control_setting );
if ( ( strcmp ( buf, "PXEClient" ) == 0 ) &&
setting_exists ( NULL, &tmp_setting ) ) {
setting_exists ( NULL, &pxe_boot_menu_setting ) &&
( ! ( ( pxe_discovery_control & PXEBS_SKIP ) &&
setting_exists ( NULL, &filename_setting ) ) ) ) {
printf ( "Booting from PXE menu\n" );
return pxe_menu_boot ( netdev );
}