pxeparent_dhcp.c File Reference

#include <string.h>
#include <gpxe/dhcp.h>
#include <gpxe/netdevice.h>
#include <undipreload.h>
#include <pxeparent.h>
#include <realmode.h>
#include <pxe_api.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
void __weak_impl()	get_cached_dhcpack (void)
	Present cached DHCP packet if it exists.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void __weak_impl() get_cached_dhcpack

(

void

)

Present cached DHCP packet if it exists.

Definition at line 32 of file pxeparent_dhcp.c.

References s_PXENV_GET_CACHED_INFO::Buffer, s_PXENV_GET_CACHED_INFO::BufferSize, DBG, undi_device::entry, undi_device::flags, memset(), s_SEGOFF16::offset, s_PXENV_GET_CACHED_INFO::PacketType, preloaded_undi, PXENV_GET_CACHED_INFO, PXENV_PACKET_TYPE_DHCP_ACK, pxeparent_call(), real_to_user(), s_SEGOFF16::segment, store_cached_dhcpack(), strerror(), and UNDI_FL_KEEP_ALL.

Referenced by start_dhcp().

                                                 {
        struct undi_device *undi;
        struct s_PXENV_GET_CACHED_INFO get_cached_info;
        int rc;

        /* Use preloaded UNDI device to get at PXE entry point */
        undi = &preloaded_undi;
        if ( ! undi->entry.segment ) {
                DBG ( "PXEDHCP no preloaded UNDI device found\n" );
                return;
        }

        /* Check that stack is available to get cached info */
        if ( ! ( undi->flags & UNDI_FL_KEEP_ALL ) ) {
                DBG ( "PXEDHCP stack was unloaded, no cache available\n" );
                return;
        }

        /* Obtain cached DHCP packet */
        memset ( &get_cached_info, 0, sizeof ( get_cached_info ) );
        get_cached_info.PacketType = PXENV_PACKET_TYPE_DHCP_ACK;

        if ( ( rc = pxeparent_call ( undi->entry, PXENV_GET_CACHED_INFO,
                                     &get_cached_info,
                                     sizeof ( get_cached_info ) ) ) != 0 ) {
                DBG ( "PXEDHCP GET_CACHED_INFO failed: %s\n", strerror ( rc ) );
                return;
        }

        DBG ( "PXEDHCP got cached info at %04x:%04x length %d\n",
              get_cached_info.Buffer.segment, get_cached_info.Buffer.offset,
              get_cached_info.BufferSize );

        /* Present cached DHCP packet */
        store_cached_dhcpack ( real_to_user ( get_cached_info.Buffer.segment,
                                              get_cached_info.Buffer.offset ),
                               get_cached_info.BufferSize );
}