1/*
2 * This file implement the Wireless Extensions proc API.
3 *
4 * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 *
7 * (As all part of the Linux kernel, this file is GPL)
8 */
9
10/*
11 * The /proc/net/wireless file is a human readable user-space interface
12 * exporting various wireless specific statistics from the wireless devices.
13 * This is the most popular part of the Wireless Extensions ;-)
14 *
15 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
16 * The content of the file is basically the content of "struct iw_statistics".
17 */
18
19#include <linux/module.h>
20#include <linux/proc_fs.h>
21#include <linux/seq_file.h>
22#include <linux/wireless.h>
23#include <linux/netdevice.h>
24#include <linux/rtnetlink.h>
25#include <net/iw_handler.h>
26#include <net/wext.h>
27
28
29static void wireless_seq_printf_stats(struct seq_file *seq,
30				      struct net_device *dev)
31{
32	/* Get stats from the driver */
33	struct iw_statistics *stats = get_wireless_stats(dev);
34	static struct iw_statistics nullstats = {};
35
36	/* show device if it's wireless regardless of current stats */
37	if (!stats) {
38#ifdef CONFIG_WIRELESS_EXT
39		if (dev->wireless_handlers)
40			stats = &nullstats;
41#endif
42#ifdef CONFIG_CFG80211
43		if (dev->ieee80211_ptr)
44			stats = &nullstats;
45#endif
46	}
47
48	if (stats) {
49		seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "
50				"%6d %6d   %6d\n",
51			   dev->name, stats->status, stats->qual.qual,
52			   stats->qual.updated & IW_QUAL_QUAL_UPDATED
53			   ? '.' : ' ',
54			   ((__s32) stats->qual.level) -
55			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
56			   stats->qual.updated & IW_QUAL_LEVEL_UPDATED
57			   ? '.' : ' ',
58			   ((__s32) stats->qual.noise) -
59			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
60			   stats->qual.updated & IW_QUAL_NOISE_UPDATED
61			   ? '.' : ' ',
62			   stats->discard.nwid, stats->discard.code,
63			   stats->discard.fragment, stats->discard.retries,
64			   stats->discard.misc, stats->miss.beacon);
65
66		if (stats != &nullstats)
67			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
68	}
69}
70
71/* ---------------------------------------------------------------- */
72/*
73 * Print info for /proc/net/wireless (print all entries)
74 */
75static int wireless_dev_seq_show(struct seq_file *seq, void *v)
76{
77	might_sleep();
78
79	if (v == SEQ_START_TOKEN)
80		seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "
81				"packets               | Missed | WE\n"
82				" face | tus | link level noise |  nwid  "
83				"crypt   frag  retry   misc | beacon | %d\n",
84			   WIRELESS_EXT);
85	else
86		wireless_seq_printf_stats(seq, v);
87	return 0;
88}
89
90static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos)
91{
92	struct net *net = seq_file_net(seq);
93	loff_t off;
94	struct net_device *dev;
95
96	rtnl_lock();
97	if (!*pos)
98		return SEQ_START_TOKEN;
99
100	off = 1;
101	for_each_netdev(net, dev)
102		if (off++ == *pos)
103			return dev;
104	return NULL;
105}
106
107static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
108{
109	struct net *net = seq_file_net(seq);
110
111	++*pos;
112
113	return v == SEQ_START_TOKEN ?
114		first_net_device(net) : next_net_device(v);
115}
116
117static void wireless_dev_seq_stop(struct seq_file *seq, void *v)
118{
119	rtnl_unlock();
120}
121
122static const struct seq_operations wireless_seq_ops = {
123	.start = wireless_dev_seq_start,
124	.next  = wireless_dev_seq_next,
125	.stop  = wireless_dev_seq_stop,
126	.show  = wireless_dev_seq_show,
127};
128
129int __net_init wext_proc_init(struct net *net)
130{
131	/* Create /proc/net/wireless entry */
132	if (!proc_create_net("wireless", 0444, net->proc_net,
133			&wireless_seq_ops, sizeof(struct seq_net_private)))
134		return -ENOMEM;
135
136	return 0;
137}
138
139void __net_exit wext_proc_exit(struct net *net)
140{
141	remove_proc_entry("wireless", net->proc_net);
142}
143