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/net/wireless/wext-proc.c

http://github.com/mirrors/linux
C | 142 lines | 99 code | 20 blank | 23 comment | 13 complexity | b9d64bb6d7757f1e5be034de30af89b7 MD5 | raw file
  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}