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A DHCP session holds a persistent reference to a network device

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This commit is contained in:
Michael Brown 2007-01-04 03:42:28 +00:00
parent ac53da1790
commit 7fafa89258
2 changed files with 27 additions and 0 deletions
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3
src/include/gpxe/dhcp.h
View File

@ -13,6 +13,7 @@
#include <gpxe/udp.h>
#include <gpxe/async.h>
#include <gpxe/retry.h>
#include <gpxe/hotplug.h>
/** BOOTP/DHCP server port */
#define BOOTPS_PORT 67
@ -452,6 +453,8 @@ struct dhcp_session {
/** Network device being configured */
struct net_device *netdev;
/** Persistent reference to network device */
struct reference netdev_ref;
/** Options obtained from server */
struct dhcp_option_block *options;

24
src/net/udp/dhcp.c
View File

@ -498,6 +498,7 @@ udp_to_dhcp ( struct udp_connection *conn ) {
* @v rc Return status code
*/
static void dhcp_done ( struct dhcp_session *dhcp, int rc ) {
/* Free up options if we failed */
if ( rc != 0 ) {
if ( dhcp->options ) {
@ -506,9 +507,15 @@ static void dhcp_done ( struct dhcp_session *dhcp, int rc ) {
}
}
/* Stop retry timer */
stop_timer ( &dhcp->timer );
/* Close UDP connection */
udp_close ( &dhcp->udp );
/* Release reference on net device */
ref_del ( &dhcp->netdev_ref );
/* Mark async operation as complete */
async_done ( &dhcp->aop, rc );
}
@ -689,6 +696,19 @@ static struct udp_operations dhcp_udp_operations = {
.newdata = dhcp_newdata,
};
/**
* Forget reference to net_device
*
* @v ref Persistent reference
*/
static void dhcp_forget_netdev ( struct reference *ref ) {
struct dhcp_session *dhcp
= container_of ( ref, struct dhcp_session, netdev_ref );
/* Kill DHCP session immediately */
dhcp_done ( dhcp, -ENETUNREACH );
}
/**
* Initiate DHCP on a network interface
*
@ -714,6 +734,10 @@ struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
goto out;
}
/* Add persistent reference to net device */
dhcp->netdev_ref.forget = dhcp_forget_netdev;
ref_add ( &dhcp->netdev_ref, &dhcp->netdev->references );
/* Proof of concept: just send a single DHCPDISCOVER */
dhcp_send_request ( dhcp );