// SPDX-License-Identifier: GPL-2.0/* * This file implement the Wireless Extensions proc API. * * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com> * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. */ /* * The /proc/net/wireless file is a human readable user-space interface * exporting various wireless specific statistics from the wireless devices. * This is the most popular part of the Wireless Extensions ;-) * * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). * The content of the file is basically the content of "struct iw_statistics". */ #include <linux/module.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/wireless.h>#include <linux/netdevice.h>#include <linux/rtnetlink.h>#include <net/iw_handler.h>#include <net/wext.h>  static void wireless_seq_printf_stats(struct seq_file *seq,				      struct net_device *dev){	/* Get stats from the driver */	struct iw_statistics *stats = get_wireless_stats(dev);	static struct iw_statistics nullstats = {}; 	/* show device if it's wireless regardless of current stats */	if (!stats) {#ifdef CONFIG_WIRELESS_EXT		if (dev->wireless_handlers)			stats = &nullstats;#endif#ifdef CONFIG_CFG80211		if (dev->ieee80211_ptr)			stats = &nullstats;#endif	} 	if (stats) {		seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "				"%6d %6d   %6d\n",			   dev->name, stats->status, stats->qual.qual,			   stats->qual.updated & IW_QUAL_QUAL_UPDATED			   ? '.' : ' ',			   ((__s32) stats->qual.level) -			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),			   stats->qual.updated & IW_QUAL_LEVEL_UPDATED			   ? '.' : ' ',			   ((__s32) stats->qual.noise) -			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),			   stats->qual.updated & IW_QUAL_NOISE_UPDATED			   ? '.' : ' ',			   stats->discard.nwid, stats->discard.code,			   stats->discard.fragment, stats->discard.retries,			   stats->discard.misc, stats->miss.beacon); 		if (stats != &nullstats)			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;	}} /* ---------------------------------------------------------------- *//* * Print info for /proc/net/wireless (print all entries) */static int wireless_dev_seq_show(struct seq_file *seq, void *v){	might_sleep(); 	if (v == SEQ_START_TOKEN)		seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "				"packets               | Missed | WE\n"				" face | tus | link level noise |  nwid  "				"crypt   frag  retry   misc | beacon | %d\n",			   WIRELESS_EXT);	else		wireless_seq_printf_stats(seq, v);	return 0;} static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos){	struct net *net = seq_file_net(seq);	loff_t off;	struct net_device *dev; 	rtnl_lock();	if (!*pos)		return SEQ_START_TOKEN; 	off = 1;	for_each_netdev(net, dev)		if (off++ == *pos)			return dev;	return NULL;} static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos){	struct net *net = seq_file_net(seq); 	++*pos; 	return v == SEQ_START_TOKEN ?		first_net_device(net) : next_net_device(v);} static void wireless_dev_seq_stop(struct seq_file *seq, void *v){	rtnl_unlock();} static const struct seq_operations wireless_seq_ops = {	.start = wireless_dev_seq_start,	.next  = wireless_dev_seq_next,	.stop  = wireless_dev_seq_stop,	.show  = wireless_dev_seq_show,}; int __net_init wext_proc_init(struct net *net){	/* Create /proc/net/wireless entry */	if (!proc_create_net("wireless", 0444, net->proc_net,			&wireless_seq_ops, sizeof(struct seq_net_private)))		return -ENOMEM; 	return 0;} void __net_exit wext_proc_exit(struct net *net){	remove_proc_entry("wireless", net->proc_net);}