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
  36static const
  37struct nla_policy wimax_gnl_state_get_policy[WIMAX_GNL_ATTR_MAX + 1] = {
  38        [WIMAX_GNL_STGET_IFIDX] = {
  39                .type = NLA_U32,
  40        },
  41};
  42
  43
  44/*
  45 * Exporting to user space over generic netlink
  46 *
  47 * Parse the state get command from user space, return a combination
  48 * value that describe the current state.
  49 *
  50 * No attributes.
  51 */
  52static
  53int wimax_gnl_doit_state_get(struct sk_buff *skb, struct genl_info *info)
  54{
  55        int result, ifindex;
  56        struct wimax_dev *wimax_dev;
  57        struct device *dev;
  58
  59        d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
  60        result = -ENODEV;
  61        if (info->attrs[WIMAX_GNL_STGET_IFIDX] == NULL) {
  62                printk(KERN_ERR "WIMAX_GNL_OP_STATE_GET: can't find IFIDX "
  63                        "attribute\n");
  64                goto error_no_wimax_dev;
  65        }
  66        ifindex = nla_get_u32(info->attrs[WIMAX_GNL_STGET_IFIDX]);
  67        wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
  68        if (wimax_dev == NULL)
  69                goto error_no_wimax_dev;
  70        dev = wimax_dev_to_dev(wimax_dev);
  71        /* Execute the operation and send the result back to user space */
  72        result = wimax_state_get(wimax_dev);
  73        dev_put(wimax_dev->net_dev);
  74error_no_wimax_dev:
  75        d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
  76        return result;
  77}
  78
  79
  80struct genl_ops wimax_gnl_state_get = {
  81        .cmd = WIMAX_GNL_OP_STATE_GET,
  82        .flags = GENL_ADMIN_PERM,
  83        .policy = wimax_gnl_state_get_policy,
  84        .doit = wimax_gnl_doit_state_get,
  85        .dumpit = NULL,
  86};
  87