283 lines
7.4 KiB
C
283 lines
7.4 KiB
C
/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* VMware GuestInfo settings
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <ipxe/init.h>
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#include <ipxe/settings.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/guestrpc.h>
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/** GuestInfo GuestRPC channel */
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static int guestinfo_channel;
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/**
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* Fetch value of typed GuestInfo setting
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*
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* @v settings Settings block
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* @v setting Setting to fetch
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* @v type Setting type to attempt (or NULL for default)
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* @v data Buffer to fill with setting data
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* @v len Length of buffer
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* @ret found Setting found in GuestInfo
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* @ret len Length of setting data, or negative error
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*/
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static int guestinfo_fetch_type ( struct settings *settings,
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struct setting *setting,
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struct setting_type *type,
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void *data, size_t len, int *found ) {
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const char *parent_name = settings->parent->name;
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char command[ 24 /* "info-get guestinfo.ipxe." */ +
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strlen ( parent_name ) + 1 /* "." */ +
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strlen ( setting->name ) + 1 /* "." */ +
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( type ? strlen ( type->name ) : 0 ) + 1 /* NUL */ ];
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struct setting *named_setting;
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char *info;
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int info_len;
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int check_len;
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int ret;
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/* Construct info-get command */
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snprintf ( command, sizeof ( command ),
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"info-get guestinfo.ipxe.%s%s%s%s%s",
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parent_name, ( parent_name[0] ? "." : "" ), setting->name,
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( type ? "." : "" ), ( type ? type->name : "" ) );
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/* Check for existence and obtain length of GuestInfo value */
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info_len = guestrpc_command ( guestinfo_channel, command, NULL, 0 );
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if ( info_len < 0 ) {
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ret = info_len;
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goto err_get_info_len;
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}
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/* Mark as found */
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*found = 1;
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/* Determine default type if necessary */
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if ( ! type ) {
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named_setting = find_setting ( setting->name );
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type = ( named_setting ?
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named_setting->type : &setting_type_string );
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}
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assert ( type != NULL );
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/* Allocate temporary block to hold GuestInfo value */
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info = zalloc ( info_len + 1 /* NUL */ );
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if ( ! info ) {
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DBGC ( settings, "GuestInfo %p could not allocate %zd bytes\n",
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settings, info_len );
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ret = -ENOMEM;
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goto err_alloc;
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}
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info[info_len] = '\0';
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/* Fetch GuestInfo value */
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check_len = guestrpc_command ( guestinfo_channel, command,
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info, info_len );
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if ( check_len < 0 ) {
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ret = check_len;
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goto err_get_info;
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}
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if ( check_len != info_len ) {
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DBGC ( settings, "GuestInfo %p length mismatch (expected %d, "
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"got %d)\n", settings, info_len, check_len );
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ret = -EIO;
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goto err_get_info;
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}
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DBGC2 ( settings, "GuestInfo %p found %s = \"%s\"\n",
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settings, &command[9] /* Skip "info-get " */, info );
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/* Parse GuestInfo value according to type */
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ret = type->parse ( info, data, len );
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if ( ret < 0 ) {
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DBGC ( settings, "GuestInfo %p could not parse \"%s\" as %s: "
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"%s\n", settings, info, type->name, strerror ( ret ) );
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goto err_parse;
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}
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err_parse:
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err_get_info:
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free ( info );
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err_alloc:
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err_get_info_len:
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return ret;
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}
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/**
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* Fetch value of GuestInfo setting
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*
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* @v settings Settings block
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* @v setting Setting to fetch
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* @v data Buffer to fill with setting data
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* @v len Length of buffer
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* @ret len Length of setting data, or negative error
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*/
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static int guestinfo_fetch ( struct settings *settings,
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struct setting *setting,
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void *data, size_t len ) {
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struct setting_type *type;
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int found = 0;
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int ret;
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/* Try default type first */
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ret = guestinfo_fetch_type ( settings, setting, NULL,
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data, len, &found );
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if ( found )
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return ret;
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/* Otherwise, try all possible types */
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for_each_table_entry ( type, SETTING_TYPES ) {
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ret = guestinfo_fetch_type ( settings, setting, type,
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data, len, &found );
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if ( found )
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return ret;
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}
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/* Not found */
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return -ENOENT;
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}
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/** GuestInfo settings operations */
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static struct settings_operations guestinfo_settings_operations = {
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.fetch = guestinfo_fetch,
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};
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/** GuestInfo settings */
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static struct settings guestinfo_settings = {
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.refcnt = NULL,
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.siblings = LIST_HEAD_INIT ( guestinfo_settings.siblings ),
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.children = LIST_HEAD_INIT ( guestinfo_settings.children ),
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.op = &guestinfo_settings_operations,
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};
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/** Initialise GuestInfo settings */
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static void guestinfo_init ( void ) {
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int rc;
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/* Open GuestRPC channel */
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guestinfo_channel = guestrpc_open();
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if ( guestinfo_channel < 0 ) {
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rc = guestinfo_channel;
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DBG ( "GuestInfo could not open channel: %s\n",
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strerror ( rc ) );
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return;
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}
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/* Register root GuestInfo settings */
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if ( ( rc = register_settings ( &guestinfo_settings, NULL,
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"vmware" ) ) != 0 ) {
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DBG ( "GuestInfo could not register settings: %s\n",
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strerror ( rc ) );
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return;
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}
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}
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/** GuestInfo settings initialiser */
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struct init_fn guestinfo_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = guestinfo_init,
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};
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/**
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* Create per-netdevice GuestInfo settings
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*
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* @v netdev Network device
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* @ret rc Return status code
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*/
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static int guestinfo_net_probe ( struct net_device *netdev ) {
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struct settings *settings;
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int rc;
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/* Do nothing unless we have a GuestInfo channel available */
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if ( guestinfo_channel < 0 )
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return 0;
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/* Allocate and initialise settings block */
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settings = zalloc ( sizeof ( *settings ) );
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if ( ! settings ) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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settings_init ( settings, &guestinfo_settings_operations, NULL, 0 );
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/* Register settings */
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if ( ( rc = register_settings ( settings, netdev_settings ( netdev ),
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"vmware" ) ) != 0 ) {
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DBGC ( settings, "GuestInfo %p could not register for %s: %s\n",
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settings, netdev->name, strerror ( rc ) );
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goto err_register;
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}
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DBGC ( settings, "GuestInfo %p registered for %s\n",
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settings, netdev->name );
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return 0;
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err_register:
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free ( settings );
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err_alloc:
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return rc;
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}
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/**
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* Handle network device or link state change
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*
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* @v netdev Network device
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*/
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static void guestinfo_net_notify ( struct net_device *netdev __unused ) {
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/* Nothing to do */
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}
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/**
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* Remove per-netdevice GuestInfo settings
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*
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* @v netdev Network device
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*/
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static void guestinfo_net_remove ( struct net_device *netdev ) {
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struct settings *parent = netdev_settings ( netdev );
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struct settings *settings;
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list_for_each_entry ( settings, &parent->children, siblings ) {
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if ( settings->op == &guestinfo_settings_operations ) {
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DBGC ( settings, "GuestInfo %p unregistered for %s\n",
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settings, netdev->name );
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unregister_settings ( settings );
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free ( settings );
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return;
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}
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}
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}
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/** GuestInfo per-netdevice driver */
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struct net_driver guestinfo_net_driver __net_driver = {
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.name = "GuestInfo",
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.probe = guestinfo_net_probe,
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.notify = guestinfo_net_notify,
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.remove = guestinfo_net_remove,
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};
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