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