path: root/net/wireless/wext-compat.c

// SPDX-License-Identifier: GPL-2.0
/*
 * cfg80211 - wext compat code
 *
 * This is temporary code until all wireless functionality is migrated
 * into cfg80211, when that happens all the exports here go away and
 * we directly assign the wireless handlers of wireless interfaces.
 *
 * Copyright 2008-2009	Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2019-2023 Intel Corporation
 */

#include <linux/export.h>
#include <linux/wireless.h>
#include <linux/nl80211.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include <net/cfg80211-wext.h>
#include "wext-compat.h"
#include "core.h"
#include "rdev-ops.h"

int cfg80211_wext_giwname(struct net_device *dev,
			  struct iw_request_info *info,
			  union iwreq_data *wrqu, char *extra)
{
	strcpy(wrqu->name, "IEEE 802.11");
	return 0;
}

int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
			  union iwreq_data *wrqu, char *extra)
{
	__u32 *mode = &wrqu->mode;
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev;
	struct vif_params vifparams;
	enum nl80211_iftype type;

	rdev = wiphy_to_rdev(wdev->wiphy);

	switch (*mode) {
	case IW_MODE_INFRA:
		type = NL80211_IFTYPE_STATION;
		break;
	case IW_MODE_ADHOC:
		type = NL80211_IFTYPE_ADHOC;
		break;
	case IW_MODE_MONITOR:
		type = NL80211_IFTYPE_MONITOR;
		break;
	default:
		return -EINVAL;
	}

	if (type == wdev->iftype)
		return 0;

	memset(&vifparams, 0, sizeof(vifparams));

	guard(wiphy)(wdev->wiphy);

	return cfg80211_change_iface(rdev, dev, type, &vifparams);
}

int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
			  union iwreq_data *wrqu, char *extra)
{
	__u32 *mode = &wrqu->mode;
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	if (!wdev)
		return -EOPNOTSUPP;

	switch (wdev->iftype) {
	case NL80211_IFTYPE_AP:
		*mode = IW_MODE_MASTER;
		break;
	case NL80211_IFTYPE_STATION:
		*mode = IW_MODE_INFRA;
		break;
	case NL80211_IFTYPE_ADHOC:
		*mode = IW_MODE_ADHOC;
		break;
	case NL80211_IFTYPE_MONITOR:
		*mode = IW_MODE_MONITOR;
		break;
	case NL80211_IFTYPE_WDS:
		*mode = IW_MODE_REPEAT;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		*mode = IW_MODE_SECOND;		/* FIXME */
		break;
	default:
		*mode = IW_MODE_AUTO;
		break;
	}
	return 0;
}


int cfg80211_wext_giwrange(struct net_device *dev,
			   struct iw_request_info *info,
			   union iwreq_data *wrqu, char *extra)
{
	struct iw_point *data = &wrqu->data;
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct iw_range *range = (struct iw_range *) extra;
	enum nl80211_band band;
	int i, c = 0;

	if (!wdev)
		return -EOPNOTSUPP;

	data->length = sizeof(struct iw_range);
	memset(range, 0, sizeof(struct iw_range));

	range->we_version_compiled = WIRELESS_EXT;
	range->we_version_source = 21;
	range->retry_capa = IW_RETRY_LIMIT;
	range->retry_flags = IW_RETRY_LIMIT;
	range->min_retry = 0;
	range->max_retry = 255;
	range->min_rts = 0;
	range->max_rts = 2347;
	range->min_frag = 256;
	range->max_frag = 2346;

	range->max_encoding_tokens = 4;

	range->max_qual.updated = IW_QUAL_NOISE_INVALID;

	switch (wdev->wiphy->signal_type) {
	case CFG80211_SIGNAL_TYPE_NONE:
		break;
	case CFG80211_SIGNAL_TYPE_MBM:
		range->max_qual.level = (u8)-110;
		range->max_qual.qual = 70;
		range->avg_qual.qual = 35;
		range->max_qual.updated |= IW_QUAL_DBM;
		range->max_qual.updated |= IW_QUAL_QUAL_UPDATED;
		range->max_qual.updated |= IW_QUAL_LEVEL_UPDATED;
		break;
	case CFG80211_SIGNAL_TYPE_UNSPEC:
		range->max_qual.level = 100;
		range->max_qual.qual = 100;
		range->avg_qual.qual = 50;
		range->max_qual.updated |= IW_QUAL_QUAL_UPDATED;
		range->max_qual.updated |= IW_QUAL_LEVEL_UPDATED;
		break;
	}

	range->avg_qual.level = range->max_qual.level / 2;
	range->avg_qual.noise = range->max_qual.noise / 2;
	range->avg_qual.updated = range->max_qual.updated;

	for (i = 0; i < wdev->wiphy->n_cipher_suites; i++) {
		switch (wdev->wiphy->cipher_suites[i]) {
		case WLAN_CIPHER_SUITE_TKIP:
			range->enc_capa |= (IW_ENC_CAPA_CIPHER_TKIP |
					    IW_ENC_CAPA_WPA);
			break;

		case WLAN_CIPHER_SUITE_CCMP:
			range->enc_capa |= (IW_ENC_CAPA_CIPHER_CCMP |
					    IW_ENC_CAPA_WPA2);
			break;

		case WLAN_CIPHER_SUITE_WEP40:
			range->encoding_size[range->num_encoding_sizes++] =
				WLAN_KEY_LEN_WEP40;
			break;

		case WLAN_CIPHER_SUITE_WEP104:
			range->encoding_size[range->num_encoding_sizes++] =
				WLAN_KEY_LEN_WEP104;
			break;
		}
	}

	for (band = 0; band < NUM_NL80211_BANDS; band ++) {
		struct ieee80211_supported_band *sband;

		sband = wdev->wiphy->bands[band];

		if (!sband)
			continue;

		for (i = 0; i < sband->n_channels && c < IW_MAX_FREQUENCIES; i++) {
			struct ieee80211_channel *chan = &sband->channels[i];

			if (!(chan->flags & IEEE80211_CHAN_DISABLED)) {
				range->freq[c].i =
					ieee80211_frequency_to_channel(
						chan->center_freq);
				range->freq[c].m = chan->center_freq;
				range->freq[c].e = 6;
				c++;
			}
		}
	}
	range->num_channels = c;
	range->num_frequency = c;

	IW_EVENT_CAPA_SET_KERNEL(range->event_capa);
	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);

	if (wdev->wiphy->max_scan_ssids > 0)
		range->scan_capa |= IW_SCAN_CAPA_ESSID;

	return 0;
}


/**
 * cfg80211_wext_freq - get wext frequency for non-"auto"
 * @freq: the wext freq encoding
 *
 * Returns: a frequency, or a negative error code, or 0 for auto.
 */
int cfg80211_wext_freq(struct iw_freq *freq)
{
	/*
	 * Parse frequency - return 0 for auto and
	 * -EINVAL for impossible things.
	 */
	if (freq->e == 0) {
		enum nl80211_band band = NL80211_BAND_2GHZ;
		if (freq->m < 0)
			return 0;
		if (freq->m > 14)
			band = NL80211_BAND_5GHZ;
		return ieee80211_channel_to_frequency(freq->m, band);
	} else {
		int i, div = 1000000;
		for (i = 0; i < freq->e; i++)
			div /= 10;
		if (div <= 0)
			return -EINVAL;
		return freq->m / div;
	}
}

int cfg80211_wext_siwrts(struct net_device *dev,
			 struct iw_request_info *info,
			 union iwreq_data *wrqu, char *extra)
{
	struct iw_param *rts = &wrqu->rts;
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	u32 orts = wdev->wiphy->rts_threshold;
	int err;

	guard(wiphy)(&rdev->wiphy);
	if (rts->disabled || !rts->fixed)
		wdev->wiphy->rts_threshold = (u32) -1;
	else if (rts->value < 0)
		return -EINVAL;
	else
		wdev->wiphy->rts_threshold = rts->value;

	err = rdev_set_wiphy_params(rdev, -1, WIPHY_PARAM_RTS_THRESHOLD);
	if (err)
		wdev->wiphy->rts_threshold = orts;
	return err;
}

int cfg80211_wext_giwrts(struct net_device *dev,
			 struct iw_request_info *info,
			 union iwreq_data *wrqu, char *extra)
{
	struct iw_param *rts = &wrqu->rts;
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	rts->value = wdev->wiphy->rts_threshold;
	rts->disabled = rts->value == (u32) -1;
	rts->fixed = 1;

	return 0;
}

int cfg80211_wext_siwfrag(struct net_device *dev,
			  struct iw_request_info *info,
			  union iwreq_data *wrqu, char *extra)
{
	struct iw_param *frag = &wrqu->frag;
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	u32 ofrag = wdev->wiphy->frag_threshold;
	int err;

	guard(wiphy)(&rdev->wiphy);

	if (frag->disabled || !frag->fixed) {
		wdev->wiphy->frag_threshold = (u32) -1;
	} else if (frag->value < 256) {
		return -EINVAL;
	} else {
		/* Fragment length must be even, so strip LSB. */
		wdev->wiphy->frag_threshold = frag->value & ~0x1;
	}

	err = rdev_set_wiphy_params(rdev, -1, WIPHY_PARAM_FRAG_THRESHOLD);
	if (err)
		wdev->wiphy->frag_threshold = ofrag;
	return err;
}

int cfg80211_wext_giwfrag(struct net_device *dev,
			  struct iw_request_info *info,
			  u