Commit 5336fa88 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Johannes Berg
Browse files

nl80211/cfg80211: enable DFS for IBSS mode 



To use DFS in IBSS mode, userspace is required to react to radar events.
It can inform nl80211 that it is capable of doing so by adding a
NL80211_ATTR_HANDLE_DFS attribute when joining the IBSS.

This attribute is supplied to let the kernelspace know that the
userspace application can and will handle radar events, e.g. by
intiating channel switches to a valid channel. DFS channels may
only be used if this attribute is supplied and the driver supports
it. Driver support will be checked even if a channel without DFS
will be initially joined, as a DFS channel may be chosen later.

Signed-off-by: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarMathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
[fix attribute name in commit message]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 687da132

include/net/cfg80211.h

+6 −0
Original line number Diff line number Diff line
@@ -1664,6 +1664,9 @@ struct cfg80211_disassoc_request { 
 *	sets/clears %NL80211_STA_FLAG_AUTHORIZED. If true, the driver is

 *	required to assume that the port is unauthorized until authorized by

 *	user space. Otherwise, port is marked authorized by default.

 * @userspace_handles_dfs: whether user space controls DFS operation, i.e.

 *	changes the channel when a radar is detected. This is required

 *	to operate on DFS channels.

 * @basic_rates: bitmap of basic rates to use when creating the IBSS

 * @mcast_rate: per-band multicast rate index + 1 (0: disabled)

 * @ht_capa:  HT Capabilities over-rides.  Values set in ht_capa_mask
@@ -1681,6 +1684,7 @@ struct cfg80211_ibss_params { 
	bool channel_fixed;

	bool privacy;

	bool control_port;

	bool userspace_handles_dfs;

	int mcast_rate[IEEE80211_NUM_BANDS];

	struct ieee80211_ht_cap ht_capa;

	struct ieee80211_ht_cap ht_capa_mask;
@@ -3061,6 +3065,7 @@ struct cfg80211_cached_keys; 
 * @conn: (private) cfg80211 software SME connection state machine data

 * @connect_keys: (private) keys to set after connection is established

 * @ibss_fixed: (private) IBSS is using fixed BSSID

 * @ibss_dfs_possible: (private) IBSS may change to a DFS channel

 * @event_list: (private) list for internal event processing

 * @event_lock: (private) lock for event list

 */
@@ -3099,6 +3104,7 @@ struct wireless_dev { 
	struct ieee80211_channel *channel;



	bool ibss_fixed;

	bool ibss_dfs_possible;



	bool ps;

	int ps_timeout;

include/uapi/linux/nl80211.h

+9 −0
Original line number Diff line number Diff line
@@ -1501,6 +1501,13 @@ enum nl80211_commands { 
 * @NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES: array of supported

 *      supported operating classes.

 *

 * @NL80211_ATTR_HANDLE_DFS: A flag indicating whether user space

 *	controls DFS operation in IBSS mode. If the flag is included in

 *	%NL80211_CMD_JOIN_IBSS request, the driver will allow use of DFS

 *	channels and reports radar events to userspace. Userspace is required

 *	to react to radar events, e.g. initiate a channel switch or leave the

 *	IBSS network.

 *

 * @NL80211_ATTR_MAX: highest attribute number currently defined

 * @__NL80211_ATTR_AFTER_LAST: internal use

 */
@@ -1815,6 +1822,8 @@ enum nl80211_attrs { 


	NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES,



	NL80211_ATTR_HANDLE_DFS,



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



	__NL80211_ATTR_AFTER_LAST,

net/wireless/chan.c

+2 −1
Original line number Diff line number Diff line
@@ -504,7 +504,8 @@ cfg80211_get_chan_state(struct wireless_dev *wdev, 
	case NL80211_IFTYPE_ADHOC:

		if (wdev->current_bss) {

			*chan = wdev->current_bss->pub.channel;

			*chanmode = wdev->ibss_fixed

			*chanmode = (wdev->ibss_fixed &&

				     !wdev->ibss_dfs_possible)

				  ? CHAN_MODE_SHARED

				  : CHAN_MODE_EXCLUSIVE;

			return;

net/wireless/ibss.c

+20 −4
Original line number Diff line number Diff line
@@ -83,6 +83,8 @@ int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev, 
			 struct cfg80211_cached_keys *connkeys)

{

	struct wireless_dev *wdev = dev->ieee80211_ptr;

	struct ieee80211_channel *check_chan;

	u8 radar_detect_width = 0;

	int err;



	ASSERT_WDEV_LOCK(wdev);
@@ -114,14 +116,28 @@ int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev, 
	wdev->connect_keys = connkeys;



	wdev->ibss_fixed = params->channel_fixed;

	wdev->ibss_dfs_possible = params->userspace_handles_dfs;

#ifdef CONFIG_CFG80211_WEXT

	wdev->wext.ibss.chandef = params->chandef;

#endif

	check_chan = params->chandef.chan;

	if (params->userspace_handles_dfs) {

		/* use channel NULL to check for radar even if the current

		 * channel is not a radar channel - it might decide to change

		 * to DFS channel later.

		 */

		radar_detect_width = BIT(params->chandef.width);

		check_chan = NULL;

	}



	err = cfg80211_can_use_chan(rdev, wdev, params->chandef.chan,

				    params->channel_fixed

	err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,

					   check_chan,

					   (params->channel_fixed &&

					    !radar_detect_width)

					   ? CHAN_MODE_SHARED

				    : CHAN_MODE_EXCLUSIVE);

					   : CHAN_MODE_EXCLUSIVE,

					   radar_detect_width);



	if (err) {

		wdev->connect_keys = NULL;

		return err;

net/wireless/nl80211.c

+6 −2
Original line number Diff line number Diff line
@@ -356,6 +356,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = { 
	[NL80211_ATTR_CSA_C_OFF_PRESP] = { .type = NLA_U16 },

	[NL80211_ATTR_STA_SUPPORTED_CHANNELS] = { .type = NLA_BINARY },

	[NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES] = { .type = NLA_BINARY },

	[NL80211_ATTR_HANDLE_DFS] = { .type = NLA_FLAG },

};



/* policy for the key attributes */
@@ -5768,9 +5769,9 @@ skip_beacons: 
	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef))

		return -EINVAL;



	/* DFS channels are only supported for AP/P2P GO ... for now. */

	if (dev->ieee80211_ptr->iftype == NL80211_IFTYPE_AP ||

	    dev->ieee80211_ptr->iftype == NL80211_IFTYPE_P2P_GO) {

	    dev->ieee80211_ptr->iftype == NL80211_IFTYPE_P2P_GO ||

	    dev->ieee80211_ptr->iftype == NL80211_IFTYPE_ADHOC) {

		err = cfg80211_chandef_dfs_required(wdev->wiphy,

						    &params.chandef);

		if (err < 0) {
@@ -6602,6 +6603,9 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info) 
	ibss.control_port =

		nla_get_flag(info->attrs[NL80211_ATTR_CONTROL_PORT]);



	ibss.userspace_handles_dfs =

		nla_get_flag(info->attrs[NL80211_ATTR_HANDLE_DFS]);



	err = cfg80211_join_ibss(rdev, dev, &ibss, connkeys);

	if (err)

		kfree(connkeys);

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