xref: /openbmc/linux/net/wireless/wext-proc.c (revision c3506372)
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 
wireless_seq_printf_stats(struct seq_file * seq,struct net_device * dev)29 static 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  */
wireless_dev_seq_show(struct seq_file * seq,void * v)75 static 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 
wireless_dev_seq_start(struct seq_file * seq,loff_t * pos)90 static 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 
wireless_dev_seq_next(struct seq_file * seq,void * v,loff_t * pos)107 static 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 
wireless_dev_seq_stop(struct seq_file * seq,void * v)117 static void wireless_dev_seq_stop(struct seq_file *seq, void *v)
118 {
119 	rtnl_unlock();
120 }
121 
122 static 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 
wext_proc_init(struct net * net)129 int __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 
wext_proc_exit(struct net * net)139 void __net_exit wext_proc_exit(struct net *net)
140 {
141 	remove_proc_entry("wireless", net->proc_net);
142 }
143