Commit 13ae75b1 authored by Jouni Malinen's avatar Jouni Malinen Committed by John W. Linville
Browse files

nl80211: New command for setting TX rate mask for rate control 



Add a new NL80211_CMD_SET_TX_BITRATE_MASK command and related
attributes to provide support for setting TX rate mask for rate
control. This uses the existing cfg80211 set_bitrate_mask operation
that was previously used only with WEXT compat code (SIOCSIWRATE). The
nl80211 command allows more generic configuration of allowed rates as
a mask instead of fixed/max rate.

Signed-off-by: default avatarJouni Malinen <jouni.malinen@atheros.com>
Acked-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 37eb0b16

include/linux/nl80211.h

+44 −0
Original line number Diff line number Diff line
@@ -295,6 +295,10 @@ 
 *	This command is also used as an event to notify when a requested

 *	remain-on-channel duration has expired.

 *

 * @NL80211_CMD_SET_TX_BITRATE_MASK: Set the mask of rates to be used in TX

 *	rate selection. %NL80211_ATTR_IFINDEX is used to specify the interface

 *	and @NL80211_ATTR_TX_RATES the set of allowed rates.

 *

 * @NL80211_CMD_MAX: highest used command number

 * @__NL80211_CMD_AFTER_LAST: internal use

 */
@@ -381,6 +385,8 @@ enum nl80211_commands { 
	NL80211_CMD_REMAIN_ON_CHANNEL,

	NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL,



	NL80211_CMD_SET_TX_BITRATE_MASK,



	/* add new commands above here */



	/* used to define NL80211_CMD_MAX below */
@@ -640,6 +646,13 @@ enum nl80211_commands { 
 *

 * @NL80211_ATTR_COOKIE: Generic 64-bit cookie to identify objects.

 *

 * @NL80211_ATTR_TX_RATES: Nested set of attributes

 *	(enum nl80211_tx_rate_attributes) describing TX rates per band. The

 *	enum nl80211_band value is used as the index (nla_type() of the nested

 *	data. If a band is not included, it will be configured to allow all

 *	rates based on negotiated supported rates information. This attribute

 *	is used with %NL80211_CMD_SET_TX_BITRATE_MASK.

 *

 * @NL80211_ATTR_MAX: highest attribute number currently defined

 * @__NL80211_ATTR_AFTER_LAST: internal use

 */
@@ -783,6 +796,8 @@ enum nl80211_attrs { 


	NL80211_ATTR_WIPHY_COVERAGE_CLASS,



	NL80211_ATTR_TX_RATES,



	/* add attributes here, update the policy in nl80211.c */



	__NL80211_ATTR_AFTER_LAST,
@@ -1482,4 +1497,33 @@ enum nl80211_key_attributes { 
	NL80211_KEY_MAX = __NL80211_KEY_AFTER_LAST - 1

};



/**

 * enum nl80211_tx_rate_attributes - TX rate set attributes

 * @__NL80211_TXRATE_INVALID: invalid

 * @NL80211_TXRATE_LEGACY: Legacy (non-MCS) rates allowed for TX rate selection

 *	in an array of rates as defined in IEEE 802.11 7.3.2.2 (u8 values with

 *	1 = 500 kbps) but without the IE length restriction (at most

 *	%NL80211_MAX_SUPP_RATES in a single array).

 * @__NL80211_TXRATE_AFTER_LAST: internal

 * @NL80211_TXRATE_MAX: highest TX rate attribute

 */

enum nl80211_tx_rate_attributes {

	__NL80211_TXRATE_INVALID,

	NL80211_TXRATE_LEGACY,



	/* keep last */

	__NL80211_TXRATE_AFTER_LAST,

	NL80211_TXRATE_MAX = __NL80211_TXRATE_AFTER_LAST - 1

};



/**

 * enum nl80211_band - Frequency band

 * @NL80211_BAND_2GHZ - 2.4 GHz ISM band

 * @NL80211_BAND_5GHZ - around 5 GHz band (4.9 - 5.7 GHz)

 */

enum nl80211_band {

	NL80211_BAND_2GHZ,

	NL80211_BAND_5GHZ,

};



#endif /* __LINUX_NL80211_H */

include/net/cfg80211.h

+2 −2
Original line number Diff line number Diff line
@@ -39,8 +39,8 @@ 
 * @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)

 */

enum ieee80211_band {

	IEEE80211_BAND_2GHZ,

	IEEE80211_BAND_5GHZ,

	IEEE80211_BAND_2GHZ = NL80211_BAND_2GHZ,

	IEEE80211_BAND_5GHZ = NL80211_BAND_5GHZ,



	/* keep last */

	IEEE80211_NUM_BANDS

net/wireless/nl80211.c

+111 −0
Original line number Diff line number Diff line
@@ -144,6 +144,7 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = { 
				 .len = WLAN_PMKID_LEN },

	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },

	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },

	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },

};



/* policy for the attributes */
@@ -575,6 +576,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags, 
	CMD(del_pmksa, DEL_PMKSA);

	CMD(flush_pmksa, FLUSH_PMKSA);

	CMD(remain_on_channel, REMAIN_ON_CHANNEL);

	CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);

	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {

		i++;

		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
@@ -4438,6 +4440,109 @@ static int nl80211_cancel_remain_on_channel(struct sk_buff *skb, 
	return err;

}



static u32 rateset_to_mask(struct ieee80211_supported_band *sband,

			   u8 *rates, u8 rates_len)

{

	u8 i;

	u32 mask = 0;



	for (i = 0; i < rates_len; i++) {

		int rate = (rates[i] & 0x7f) * 5;

		int ridx;

		for (ridx = 0; ridx < sband->n_bitrates; ridx++) {

			struct ieee80211_rate *srate =

				&sband->bitrates[ridx];

			if (rate == srate->bitrate) {

				mask |= 1 << ridx;

				break;

			}

		}

		if (ridx == sband->n_bitrates)

			return 0; /* rate not found */

	}



	return mask;

}



static struct nla_policy

nl80211_txattr_policy[NL80211_TXRATE_MAX + 1] __read_mostly = {

	[NL80211_TXRATE_LEGACY] = { .type = NLA_BINARY,

				    .len = NL80211_MAX_SUPP_RATES },

};



static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,

				       struct genl_info *info)

{

	struct nlattr *tb[NL80211_TXRATE_MAX + 1];

	struct cfg80211_registered_device *rdev;

	struct cfg80211_bitrate_mask mask;

	int err, rem, i;

	struct net_device *dev;

	struct nlattr *tx_rates;

	struct ieee80211_supported_band *sband;



	if (info->attrs[NL80211_ATTR_TX_RATES] == NULL)

		return -EINVAL;



	rtnl_lock();



	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);

	if (err)

		goto unlock_rtnl;



	if (!rdev->ops->set_bitrate_mask) {

		err = -EOPNOTSUPP;

		goto unlock;

	}



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

	/* Default to all rates enabled */

	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {

		sband = rdev->wiphy.bands[i];

		mask.control[i].legacy =

			sband ? (1 << sband->n_bitrates) - 1 : 0;

	}



	/*

	 * The nested attribute uses enum nl80211_band as the index. This maps

	 * directly to the enum ieee80211_band values used in cfg80211.

	 */

	nla_for_each_nested(tx_rates, info->attrs[NL80211_ATTR_TX_RATES], rem)

	{

		enum ieee80211_band band = nla_type(tx_rates);

		if (band < 0 || band >= IEEE80211_NUM_BANDS) {

			err = -EINVAL;

			goto unlock;

		}

		sband = rdev->wiphy.bands[band];

		if (sband == NULL) {

			err = -EINVAL;

			goto unlock;

		}

		nla_parse(tb, NL80211_TXRATE_MAX, nla_data(tx_rates),

			  nla_len(tx_rates), nl80211_txattr_policy);

		if (tb[NL80211_TXRATE_LEGACY]) {

			mask.control[band].legacy = rateset_to_mask(

				sband,

				nla_data(tb[NL80211_TXRATE_LEGACY]),

				nla_len(tb[NL80211_TXRATE_LEGACY]));

			if (mask.control[band].legacy == 0) {

				err = -EINVAL;

				goto unlock;

			}

		}

	}



	err = rdev->ops->set_bitrate_mask(&rdev->wiphy, dev, NULL, &mask);



 unlock:

	dev_put(dev);

	cfg80211_unlock_rdev(rdev);

 unlock_rtnl:

	rtnl_unlock();

	return err;

}



static struct genl_ops nl80211_ops[] = {

	{

		.cmd = NL80211_CMD_GET_WIPHY,
@@ -4712,6 +4817,12 @@ static struct genl_ops nl80211_ops[] = { 
		.policy = nl80211_policy,

		.flags = GENL_ADMIN_PERM,

	},

	{

		.cmd = NL80211_CMD_SET_TX_BITRATE_MASK,

		.doit = nl80211_set_tx_bitrate_mask,

		.policy = nl80211_policy,

		.flags = GENL_ADMIN_PERM,

	},

};



static struct genl_multicast_group nl80211_mlme_mcgrp = {

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