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