Linux Kernel  3.7.1
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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 <[email protected]>
6  *
7  * Based on previous WiMAX core work by:
8  * Copyright (C) 2008 Intel Corporation <[email protected]>
9  * Inaky Perez-Gonzalez <[email protected]>
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 struct nla_policy wimax_gnl_state_get_policy[WIMAX_GNL_ATTR_MAX + 1] = {
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  */
51 static
52 int 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);
71 error_no_wimax_dev:
72  d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
73  return result;
74 }
75 
76 
79  .flags = GENL_ADMIN_PERM,
80  .policy = wimax_gnl_state_get_policy,
81  .doit = wimax_gnl_doit_state_get,
82  .dumpit = NULL,
83 };