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Linux/net/wireless/wext-proc.c

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  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 = {
136         .owner   = THIS_MODULE,
137         .open    = seq_open_wireless,
138         .read    = seq_read,
139         .llseek  = seq_lseek,
140         .release = seq_release_net,
141 };
142 
143 int __net_init wext_proc_init(struct net *net)
144 {
145         /* Create /proc/net/wireless entry */
146         if (!proc_create("wireless", S_IRUGO, net->proc_net,
147                          &wireless_seq_fops))
148                 return -ENOMEM;
149 
150         return 0;
151 }
152 
153 void __net_exit wext_proc_exit(struct net *net)
154 {
155         remove_proc_entry("wireless", net->proc_net);
156 }
157 

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