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Annotation of qemu/roms/ipxe/src/net/cachedhcp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2009 Joshua Oreman <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <stdio.h>
        !            22: #include <stdlib.h>
        !            23: #include <string.h>
        !            24: #include <ipxe/dhcp.h>
        !            25: #include <ipxe/dhcppkt.h>
        !            26: #include <ipxe/netdevice.h>
        !            27: #include <ipxe/iobuf.h>
        !            28: #include <ipxe/uaccess.h>
        !            29: 
        !            30: /** @file
        !            31:  *
        !            32:  * Cached DHCP packet handling
        !            33:  *
        !            34:  */
        !            35: 
        !            36: /**
        !            37:  * Store cached DHCPACK packet
        !            38:  *
        !            39:  * @v data             User pointer to cached DHCP packet data
        !            40:  * @v len              Length of cached DHCP packet data
        !            41:  * @ret rc             Return status code
        !            42:  *
        !            43:  * This function should be called by the architecture-specific
        !            44:  * get_cached_dhcpack() handler.
        !            45:  */
        !            46: void store_cached_dhcpack ( userptr_t data, size_t len ) {
        !            47:        struct dhcp_packet *dhcppkt;
        !            48:        struct dhcphdr *dhcphdr;
        !            49:        struct settings *parent;
        !            50:        int rc;
        !            51: 
        !            52:        /* Create DHCP packet */
        !            53:        dhcppkt = zalloc ( sizeof ( *dhcppkt ) + len );
        !            54:        if ( ! dhcppkt )
        !            55:                return;
        !            56: 
        !            57:        /* Fill in data for DHCP packet */
        !            58:        dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( * dhcppkt ) );
        !            59:        copy_from_user ( dhcphdr, data, 0, len );
        !            60:        dhcppkt_init ( dhcppkt, dhcphdr, len );
        !            61:        DBG_HD ( dhcppkt->options.data, dhcppkt->options.used_len );
        !            62: 
        !            63:        /* Register settings on the last opened network device.
        !            64:         * This will have the effect of registering cached settings
        !            65:         * with a network device when "dhcp netX" is performed for that
        !            66:         * device, which is usually what we want.
        !            67:         */
        !            68:        parent = netdev_settings ( last_opened_netdev() );
        !            69:        if ( ( rc = register_settings ( &dhcppkt->settings, parent,
        !            70:                                        DHCP_SETTINGS_NAME ) ) != 0 )
        !            71:                DBG ( "DHCP could not register cached settings: %s\n",
        !            72:                      strerror ( rc ) );
        !            73: 
        !            74:        dhcppkt_put ( dhcppkt );
        !            75: 
        !            76:        DBG ( "DHCP registered cached settings\n" );
        !            77: }

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