cachedhcp.c File Reference

Cached DHCP packet handling. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gpxe/dhcp.h>
#include <gpxe/dhcppkt.h>
#include <gpxe/netdevice.h>
#include <gpxe/iobuf.h>
#include <gpxe/uaccess.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	store_cached_dhcpack (userptr_t data, size_t len)
	Store cached DHCPACK packet.

---

Detailed Description

Cached DHCP packet handling.

Definition in file cachedhcp.c.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void store_cached_dhcpack	(	userptr_t	data,
		size_t	len
	)

Store cached DHCPACK packet.

Parameters:

	data	User pointer to cached DHCP packet data
	len	Length of cached DHCP packet data

Return values:

rc

Return status code

This function should be called by the architecture-specific get_cached_dhcpack() handler.

Definition at line 46 of file cachedhcp.c.

References copy_from_user(), dhcp_options::data, DBG, DBG_HD, dhcppkt_init(), dhcppkt_put(), last_opened_netdev(), dhcp_options::len, netdev_settings(), dhcp_packet::options, settings::parent, register_settings(), dhcp_packet::settings, strerror(), and zalloc().

Referenced by get_cached_dhcpack().

                                                         {
        struct dhcp_packet *dhcppkt;
        struct dhcphdr *dhcphdr;
        struct settings *parent;
        int rc;

        /* Create DHCP packet */
        dhcppkt = zalloc ( sizeof ( *dhcppkt ) + len );
        if ( ! dhcppkt )
                return;

        /* Fill in data for DHCP packet */
        dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( * dhcppkt ) );
        copy_from_user ( dhcphdr, data, 0, len );
        dhcppkt_init ( dhcppkt, dhcphdr, len );
        DBG_HD ( dhcppkt->options.data, dhcppkt->options.len );

        /* Register settings on the last opened network device.
         * This will have the effect of registering cached settings
         * with a network device when "dhcp netX" is performed for that
         * device, which is usually what we want.
         */
        parent = netdev_settings ( last_opened_netdev() );
        if ( ( rc = register_settings ( &dhcppkt->settings, parent ) ) != 0 )
                DBG ( "DHCP could not register cached settings: %s\n",
                      strerror ( rc ) );

        dhcppkt_put ( dhcppkt );

        DBG ( "DHCP registered cached settings\n" );
}