Release 4.11 net/wireless/wext-compat.c

/*
 * 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>
 */

#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,
			  char *name, char *extra)
{
	strcpy(name, "IEEE 802.11");
	return 0;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwname);



int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
			  u32 *mode, char *extra)
{
	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_REPEAT:
		type = NL80211_IFTYPE_WDS;
		break;
	case IW_MODE_MONITOR:
		type = NL80211_IFTYPE_MONITOR;
		break;
	default:
		return -EINVAL;
	}

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

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

	return cfg80211_change_iface(rdev, dev, type, NULL, &vifparams);
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_siwmode);



int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
			  u32 *mode, char *extra)
{
	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;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwmode);




int cfg80211_wext_giwrange(struct net_device *dev,
			   struct iw_request_info *info,
			   struct iw_point *data, char *extra)
{
	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;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwrange);


/**
 * cfg80211_wext_freq - get wext frequency for non-"auto"
 * @dev: the net device
 * @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;
	}
}

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int cfg80211_wext_siwrts(struct net_device *dev,
			 struct iw_request_info *info,
			 struct iw_param *rts, char *extra)
{
	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;

	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, WIPHY_PARAM_RTS_THRESHOLD);
	if (err)
		wdev->wiphy->rts_threshold = orts;

	return err;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_siwrts);



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

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

	return 0;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwrts);



int cfg80211_wext_siwfrag(struct net_device *dev,
			  struct iw_request_info *info,
			  struct iw_param *frag, char *extra)
{
	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;

	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, WIPHY_PARAM_FRAG_THRESHOLD);
	if (err)
		wdev->wiphy->frag_threshold = ofrag;

	return err;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_siwfrag);



int cfg80211_wext_giwfrag(struct net_device *dev,
			  struct iw_request_info *info,
			  struct iw_param *frag, char *extra)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	frag->value = wdev->wiphy->frag_threshold;
	frag->disabled = frag->value == (u32) -1;
	frag->fixed = 1;

	return 0;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwfrag);



static int cfg80211_wext_siwretry(struct net_device *dev,
				  struct iw_request_info *info,
				  struct iw_param *retry, char *extra)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	u32 changed = 0;
	u8 olong = wdev->wiphy->retry_long;
	u8 oshort = wdev->wiphy->retry_short;
	int err;

	if (retry->disabled || retry->value < 1 || retry->value > 255 ||
	    (retry->flags & IW_RETRY_TYPE) != IW_RETRY_LIMIT)
		return -EINVAL;

	if (retry->flags & IW_RETRY_LONG) {
		wdev->wiphy->retry_long = retry->value;
		changed |= WIPHY_PARAM_RETRY_LONG;
	} else if (retry->flags & IW_RETRY_SHORT) {
		wdev->wiphy->retry_short = retry->value;
		changed |= WIPHY_PARAM_RETRY_SHORT;
	} else {
		wdev->wiphy->retry_short = retry->value;
		wdev->wiphy->retry_long = retry->value;
		changed |= WIPHY_PARAM_RETRY_LONG;
		changed |= WIPHY_PARAM_RETRY_SHORT;
	}

	if (!changed)
		return 0;

	err = rdev_set_wiphy_params(rdev, changed);
	if (err) {
		wdev->wiphy->retry_short = oshort;
		wdev->wiphy->retry_long = olong;
	}

	return err;
}

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int cfg80211_wext_giwretry(struct net_device *dev,
			   struct iw_request_info *info,
			   struct iw_param *retry, char *extra)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	retry->disabled = 0;

	if (retry->flags == 0 || (retry->flags & IW_RETRY_SHORT)) {
		/*
                 * First return short value, iwconfig will ask long value
                 * later if needed
                 */
		retry->flags |= IW_RETRY_LIMIT | IW_RETRY_SHORT;
		retry->value = wdev->wiphy->retry_short;
		if (wdev->wiphy->retry_long == wdev->wiphy->retry_short)
			retry->flags |= IW_RETRY_LONG;

		return 0;
	}

	if (retry->flags & IW_RETRY_LONG) {
		retry->flags = IW_RETRY_LIMIT | IW_RETRY_LONG;
		retry->value = wdev->wiphy->retry_long;
	}

	return 0;
}
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EXPORT_WEXT_HANDLER(cfg80211_wext_giwretry);



static int __cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
				     struct net_device *dev, bool pairwise,
				     const u8 *addr, bool remove, bool tx_key,
				     int idx, struct key_params *params)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err, i;
	bool rejoin = false;

	if (pairwise && !addr)
		return -EINVAL;

	/*
         * In many cases we won't actually need this, but it's better
         * to do it first in case the allocation fails. Don't use wext.
         */
	if (!wdev->wext.keys) {
		wdev->wext.keys = kzalloc(sizeof(*wdev->wext.keys),
					  GFP_KERNEL);
		if (!wdev->wext.keys)
			return -ENOMEM;
		for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
			wdev->wext.keys->params[i].key =
				wdev->wext.keys->data[i];
	}

	if (wdev->iftype != NL80211_IFTYPE_ADHOC &&
	    wdev->iftype != NL80211_IFTYPE_STATION)
		return -EOPNOTSUPP;

	if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
		if (!wdev->current_bss)
			return -ENOLINK;

		if (!rdev->ops->set_default_mgmt_key)
			return -EOPNOTSUPP;

		if (idx < 4 || idx > 5)
			return -EINVAL;
	} else if (idx < 0 || idx > 3)
		return -EINVAL;

	if (remove) {
		err = 0;
		if (wdev->current_bss) {
			/*
                         * If removing the current TX key, we will need to
                         * join a new IBSS without the privacy bit clear.
                         */
			if (idx == wdev->wext.default_key &&
			    wdev->iftype == NL80211_IFTYPE_ADHOC) {
				__cfg80211_leave_ibss(rdev, wdev->netdev, true);
				rejoin = true;
			}

			if (!pairwise && addr &&
			    !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
				err = -ENOENT;
			else
				err = rdev_del_key(rdev, dev, idx, pairwise,
						   addr);
		}
		wdev->wext.connect.privacy = false;
		/*
                 * Applications using wireless extensions expect to be
                 * able to delete keys that don't exist, so allow that.
                 */
		if (err == -ENOENT)
			err = 0;
		if (!err) {
			if (!addr && idx < 4) {
				memset(wdev->wext.keys->data[idx], 0,
				       sizeof(wdev->wext.keys->data[idx]));
				wdev->wext.keys->params[idx].key_len = 0;
				wdev->wext.keys->params[idx].cipher = 0;
			}
			if (idx == wdev->wext.default_key)
				wdev->wext.default_key = -1;
			else if (idx == wdev->wext.default_mgmt_key)
				wdev->wext.default_mgmt_key = -1;
		}

		if (!err && rejoin)
			err = cfg80211_ibss_wext_join(rdev, wdev);

		return err;
	}

	if (addr)
		tx_key = false;

	if (cfg80211_validate_key_settings(rdev, params, idx, pairwise, addr))
		return -EINVAL;

	err = 0;
	if (wdev->current_bss)
		err = rdev_add_key(rdev, dev, idx, pairwise, addr, params);
	else if (params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
		 params->cipher != WLAN_CIPHER_SUITE_WEP104)
		return -EINVAL;
	if (err)
		return err;

	/*
         * We only need to store WEP keys, since they're the only keys that
         * can be be set before a connection is established and persist after
         * disconnecting.
         */
	if (!addr && (params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
		      params->cipher == WLAN_CIPHER_SUITE_WEP104)) {
		wdev->wext.keys->params[idx] = *params;
		memcpy(wdev->wext.keys->data[idx],
			params->key, params->key_len);
		wdev->wext.keys->params[idx].key =
			wdev->wext.keys->data[idx];
	}

	if ((params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
	     params->cipher == WLAN_CIPHER_SUITE_WEP104) &&
	    (tx_key || (!addr && wdev->wext.default_key == -1))) {
		if (wdev->current_bss) {
			/*
                         * If we are getting a new TX key from not having
                         * had one before we need to join a new IBSS with
                         * the privacy bit set.
                         */
			if (wdev->iftype == NL80211_IFTYPE_ADHOC &&
			    wdev->wext.default_key == -1) {
				__cfg80211_leave_ibss(rdev, wdev->netdev, true);
				rejoin = true;
			}
			err = rdev_set_default_key(rdev, dev, idx, true, true);
		}
		if (!err) {
			wdev->wext.default_key = idx;
			if (rejoin)
				err = cfg80211_ibss_wext_join(rdev, wdev);
		}
		return err;
	}

	if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC &&
	    (tx_key || (!addr && wdev->wext.default_mgmt_key == -1))) {
		if (wdev->current_bss)
			err = rdev_set_default_mgmt_key(rdev, dev, idx);
		if (!err)
			wdev->wext.default_mgmt_key = idx;
		return err;
	}

	return 0;
}

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static int cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
				   struct net_device *dev, bool pairwise,
				   const u8 *addr, bool remove, bool tx_key,
				   int idx, struct key_params *params)
{
	int err;

	wdev_lock(dev->ieee80211_ptr);
	err = __cfg80211_set_encryption(rdev, dev, pairwise, addr,
					remove, tx_key, idx, params);
	wdev_unlock(dev->ieee80211_ptr);

	return err;
}

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static int cfg80211_wext_siwencode(struct net_device *dev,
				   struct iw_request_info *info,
				   struct iw_point *erq, char *keybuf)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	int idx, err;
	bool remove = false;
	struct key_params params;

	if (wdev->iftype != NL80211_IFTYPE_STATION &&
	    wdev->iftype != NL80211_IFTYPE_ADHOC)
		return -EOPNOTSUPP;

	/* no use -- only MFP (set_default_mgmt_key) is optional */
	if (!rdev->ops->del_key ||
	    !rdev->ops->add_key ||
	    !rdev->ops->set_default_key)
		return -EOPNOTSUPP;

	idx = erq->flags & IW_ENCODE_INDEX;
	if (idx == 0) {
		idx = wdev->wext.default_key;
		if (idx < 0)
			idx = 0;
	} else if (idx < 1 || idx > 4)
		return -EINVAL;
	else
		idx--;

	if (erq->flags & IW_ENCODE_DISABLED)
		remove = true;
	else if (erq->length == 0) {
		/* No key data - just set the default TX key index */
		err = 0;
		wdev_lock(wdev);
		if (wdev->current_bss)
			err = rdev_set_default_key(rdev, dev, idx, true,
						   true);
		if (!err)
			wdev->wext.default_key = idx;
		wdev_unlock(wdev);
		return err;
	}

	memset(&params, 0, sizeof(params));
	params.key = keybuf;
	params.key_len = erq->length;
	if (erq->length == 5)
		params.cipher = WLAN_CIPHER_SUITE_WEP40;
	else if (erq->length == 13)
		params.cipher = WLAN_CIPHER_SUITE_WEP104;
	else if (!remove)
		return -EINVAL;

	return cfg80211_set_encryption(rdev, dev, false, NULL, remove,
				       wdev->wext.default_key == -1,
				       idx