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 static const
  37 struct 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  */
  52 static
  53 int 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);
  74 error_no_wimax_dev:
  75         d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
  76         return result;
  77 }
  78
  79
  80 struct 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 };