LXR linux/net/wimax/op-state-get.c

   1/*
   2 * Linux WiMAX
   3 * Implement and export a method for getting a WiMAX device current state
   4 *
   5 * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
   6 *
   7 * Based on previous WiMAX core work by:
   8 *  Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
   9 *  Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License version
  13 * 2 as published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23 * 02110-1301, USA.
  24 */
  25
  26#include <net/wimax.h>
  27#include <net/genetlink.h>
  28#include <linux/wimax.h>
  29#include <linux/security.h>
  30#include "wimax-internal.h"
  31
  32#define D_SUBMODULE op_state_get
  33#include "debug-levels.h"
  34
  35
  36/*
  37 * Exporting to user space over generic netlink
  38 *
  39 * Parse the state get command from user space, return a combination
  40 * value that describe the current state.
  41 *
  42 * No attributes.
  43 */
  44int wimax_gnl_doit_state_get(struct sk_buff *skb, struct genl_info *info)
  45{
  46        int result, ifindex;
  47        struct wimax_dev *wimax_dev;
  48
  49        d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
  50        result = -ENODEV;
  51        if (info->attrs[WIMAX_GNL_STGET_IFIDX] == NULL) {
  52                pr_err("WIMAX_GNL_OP_STATE_GET: can't find IFIDX attribute\n");
  53                goto error_no_wimax_dev;
  54        }
  55        ifindex = nla_get_u32(info->attrs[WIMAX_GNL_STGET_IFIDX]);
  56        wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
  57        if (wimax_dev == NULL)
  58                goto error_no_wimax_dev;
  59        /* Execute the operation and send the result back to user space */
  60        result = wimax_state_get(wimax_dev);
  61        dev_put(wimax_dev->net_dev);
  62error_no_wimax_dev:
  63        d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
  64        return result;
  65}
  66