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3d23e349 JB |
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 | ||
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 | */ | |
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 | ||
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 | ||
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 | ||
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 | ||
129 | static int seq_open_wireless(struct inode *inode, struct file *file) | |
130 | { | |
131 | return seq_open_net(inode, file, &wireless_seq_ops, | |
132 | sizeof(struct seq_net_private)); | |
133 | } | |
134 | ||
135 | static const struct file_operations wireless_seq_fops = { | |
3d23e349 JB |
136 | .open = seq_open_wireless, |
137 | .read = seq_read, | |
138 | .llseek = seq_lseek, | |
139 | .release = seq_release_net, | |
140 | }; | |
141 | ||
2c8c1e72 | 142 | int __net_init wext_proc_init(struct net *net) |
3d23e349 JB |
143 | { |
144 | /* Create /proc/net/wireless entry */ | |
d6444062 | 145 | if (!proc_create("wireless", 0444, net->proc_net, |
d4beaa66 | 146 | &wireless_seq_fops)) |
3d23e349 JB |
147 | return -ENOMEM; |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
2c8c1e72 | 152 | void __net_exit wext_proc_exit(struct net *net) |
3d23e349 | 153 | { |
ece31ffd | 154 | remove_proc_entry("wireless", net->proc_net); |
3d23e349 | 155 | } |