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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file implement the Wireless Extensions proc API.
4 *
5 * Authors : Jean Tourrilhes - HPL - <[email protected]>
6 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
7 */
8
9/*
10 * The /proc/net/wireless file is a human readable user-space interface
11 * exporting various wireless specific statistics from the wireless devices.
12 * This is the most popular part of the Wireless Extensions ;-)
13 *
14 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
15 * The content of the file is basically the content of "struct iw_statistics".
16 */
17
18#include <linux/module.h>
19#include <linux/proc_fs.h>
20#include <linux/seq_file.h>
21#include <linux/wireless.h>
22#include <linux/netdevice.h>
23#include <linux/rtnetlink.h>
24#include <net/iw_handler.h>
25#include <net/wext.h>
26
27
28static void wireless_seq_printf_stats(struct seq_file *seq,
29 struct net_device *dev)
30{
31 /* Get stats from the driver */
32 struct iw_statistics *stats = get_wireless_stats(dev);
33 static struct iw_statistics nullstats = {};
34
35 /* show device if it's wireless regardless of current stats */
36 if (!stats) {
37#ifdef CONFIG_WIRELESS_EXT
38 if (dev->wireless_handlers)
39 stats = &nullstats;
40#endif
41#ifdef CONFIG_CFG80211
42 if (dev->ieee80211_ptr)
43 stats = &nullstats;
44#endif
45 }
46
47 if (stats) {
48 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
49 "%6d %6d %6d\n",
50 dev->name, stats->status, stats->qual.qual,
51 stats->qual.updated & IW_QUAL_QUAL_UPDATED
52 ? '.' : ' ',
53 ((__s32) stats->qual.level) -
54 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
55 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
56 ? '.' : ' ',
57 ((__s32) stats->qual.noise) -
58 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
59 stats->qual.updated & IW_QUAL_NOISE_UPDATED
60 ? '.' : ' ',
61 stats->discard.nwid, stats->discard.code,
62 stats->discard.fragment, stats->discard.retries,
63 stats->discard.misc, stats->miss.beacon);
64
65 if (stats != &nullstats)
66 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
67 }
68}
69
70/* ---------------------------------------------------------------- */
71/*
72 * Print info for /proc/net/wireless (print all entries)
73 */
74static int wireless_dev_seq_show(struct seq_file *seq, void *v)
75{
76 might_sleep();
77
78 if (v == SEQ_START_TOKEN)
79 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
80 "packets | Missed | WE\n"
81 " face | tus | link level noise | nwid "
82 "crypt frag retry misc | beacon | %d\n",
83 WIRELESS_EXT);
84 else
85 wireless_seq_printf_stats(seq, v);
86 return 0;
87}
88
89static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos)
90{
91 struct net *net = seq_file_net(seq);
92 loff_t off;
93 struct net_device *dev;
94
95 rtnl_lock();
96 if (!*pos)
97 return SEQ_START_TOKEN;
98
99 off = 1;
100 for_each_netdev(net, dev)
101 if (off++ == *pos)
102 return dev;
103 return NULL;
104}
105
106static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
107{
108 struct net *net = seq_file_net(seq);
109
110 ++*pos;
111
112 return v == SEQ_START_TOKEN ?
113 first_net_device(net) : next_net_device(v);
114}
115
116static void wireless_dev_seq_stop(struct seq_file *seq, void *v)
117{
118 rtnl_unlock();
119}
120
121static const struct seq_operations wireless_seq_ops = {
122 .start = wireless_dev_seq_start,
123 .next = wireless_dev_seq_next,
124 .stop = wireless_dev_seq_stop,
125 .show = wireless_dev_seq_show,
126};
127
128int __net_init wext_proc_init(struct net *net)
129{
130 /* Create /proc/net/wireless entry */
131 if (!proc_create_net("wireless", 0444, net->proc_net,
132 &wireless_seq_ops, sizeof(struct seq_net_private)))
133 return -ENOMEM;
134
135 return 0;
136}
137
138void __net_exit wext_proc_exit(struct net *net)
139{
140 remove_proc_entry("wireless", net->proc_net);
141}