1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file implement the Wireless Extensions proc API. 4 * 5 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> 6 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. 7 */ 8 9 /* 10 * The /proc/net/wireless file is a human readable user-space interface 11 * exporting various wireless specific statistics from the wireless devices. 12 * This is the most popular part of the Wireless Extensions ;-) 13 * 14 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). 15 * The content of the file is basically the content of "struct iw_statistics". 16 */ 17 18 #include <linux/module.h> 19 #include <linux/proc_fs.h> 20 #include <linux/seq_file.h> 21 #include <linux/wireless.h> 22 #include <linux/netdevice.h> 23 #include <linux/rtnetlink.h> 24 #include <net/iw_handler.h> 25 #include <net/wext.h> 26 27 28 static void wireless_seq_printf_stats(struct seq_file *seq, 29 struct net_device *dev) 30 { 31 /* Get stats from the driver */ 32 struct iw_statistics *stats = get_wireless_stats(dev); 33 static struct iw_statistics nullstats = {}; 34 35 /* show device if it's wireless regardless of current stats */ 36 if (!stats) { 37 #ifdef CONFIG_WIRELESS_EXT 38 if (dev->wireless_handlers) 39 stats = &nullstats; 40 #endif 41 #ifdef CONFIG_CFG80211 42 if (dev->ieee80211_ptr) 43 stats = &nullstats; 44 #endif 45 } 46 47 if (stats) { 48 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d " 49 "%6d %6d %6d\n", 50 dev->name, stats->status, stats->qual.qual, 51 stats->qual.updated & IW_QUAL_QUAL_UPDATED 52 ? '.' : ' ', 53 ((__s32) stats->qual.level) - 54 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), 55 stats->qual.updated & IW_QUAL_LEVEL_UPDATED 56 ? '.' : ' ', 57 ((__s32) stats->qual.noise) - 58 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), 59 stats->qual.updated & IW_QUAL_NOISE_UPDATED 60 ? '.' : ' ', 61 stats->discard.nwid, stats->discard.code, 62 stats->discard.fragment, stats->discard.retries, 63 stats->discard.misc, stats->miss.beacon); 64 65 if (stats != &nullstats) 66 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; 67 } 68 } 69 70 /* ---------------------------------------------------------------- */ 71 /* 72 * Print info for /proc/net/wireless (print all entries) 73 */ 74 static int wireless_dev_seq_show(struct seq_file *seq, void *v) 75 { 76 might_sleep(); 77 78 if (v == SEQ_START_TOKEN) 79 seq_printf(seq, "Inter-| sta-| Quality | Discarded " 80 "packets | Missed | WE\n" 81 " face | tus | link level noise | nwid " 82 "crypt frag retry misc | beacon | %d\n", 83 WIRELESS_EXT); 84 else 85 wireless_seq_printf_stats(seq, v); 86 return 0; 87 } 88 89 static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos) 90 { 91 struct net *net = seq_file_net(seq); 92 loff_t off; 93 struct net_device *dev; 94 95 rtnl_lock(); 96 if (!*pos) 97 return SEQ_START_TOKEN; 98 99 off = 1; 100 for_each_netdev(net, dev) 101 if (off++ == *pos) 102 return dev; 103 return NULL; 104 } 105 106 static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) 107 { 108 struct net *net = seq_file_net(seq); 109 110 ++*pos; 111 112 return v == SEQ_START_TOKEN ? 113 first_net_device(net) : next_net_device(v); 114 } 115 116 static void wireless_dev_seq_stop(struct seq_file *seq, void *v) 117 { 118 rtnl_unlock(); 119 } 120 121 static const struct seq_operations wireless_seq_ops = { 122 .start = wireless_dev_seq_start, 123 .next = wireless_dev_seq_next, 124 .stop = wireless_dev_seq_stop, 125 .show = wireless_dev_seq_show, 126 }; 127 128 int __net_init wext_proc_init(struct net *net) 129 { 130 /* Create /proc/net/wireless entry */ 131 if (!proc_create_net("wireless", 0444, net->proc_net, 132 &wireless_seq_ops, sizeof(struct seq_net_private))) 133 return -ENOMEM; 134 135 return 0; 136 } 137 138 void __net_exit wext_proc_exit(struct net *net) 139 { 140 remove_proc_entry("wireless", net->proc_net); 141 } 142