net/wireless/wext-proc.c

   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_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
 147                 return -ENOMEM;
 148
 149         return 0;
 150 }
 151
 152 void __net_exit wext_proc_exit(struct net *net)
 153 {
 154         proc_net_remove(net, "wireless");
 155 }