Commit 9aed3cc1 authored by Jouni Malinen's avatar Jouni Malinen Committed by John W. Linville
Browse files

nl80211: New command for adding extra IE(s) into management frames 



A new nl80211 command, NL80211_CMD_SET_MGMT_EXTRA_IE, can be used to
add arbitrary IE data into the end of management frames. The interface
allows extra IEs to be configured for each management frame subtype, but
only some of them (ProbeReq, ProbeResp, Auth, (Re)AssocReq, Deauth,
Disassoc) are currently accepted in mac80211 implementation.

This makes it easier to implement IEEE 802.11 extensions like WPS and
FT that add IE(s) into some management frames. In addition, this can
be useful for testing and experimentation purposes.

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 0c1aa495

include/linux/nl80211.h

+22 −0
Original line number Diff line number Diff line
@@ -133,6 +133,14 @@ 
 * @NL80211_CMD_SET_MESH_PARAMS: Set mesh networking properties for the

 *      interface identified by %NL80211_ATTR_IFINDEX

 *

 * @NL80211_CMD_SET_MGMT_EXTRA_IE: Set extra IEs for management frames. The

 *	interface is identified with %NL80211_ATTR_IFINDEX and the management

 *	frame subtype with %NL80211_ATTR_MGMT_SUBTYPE. The extra IE data to be

 *	added to the end of the specified management frame is specified with

 *	%NL80211_ATTR_IE. If the command succeeds, the requested data will be

 *	added to all specified management frames generated by

 *	kernel/firmware/driver.

 *

 * @NL80211_CMD_MAX: highest used command number

 * @__NL80211_CMD_AFTER_LAST: internal use

 */
@@ -178,6 +186,8 @@ enum nl80211_commands { 
	NL80211_CMD_GET_MESH_PARAMS,

	NL80211_CMD_SET_MESH_PARAMS,



	NL80211_CMD_SET_MGMT_EXTRA_IE,



	/* add new commands above here */



	/* used to define NL80211_CMD_MAX below */
@@ -190,6 +200,7 @@ enum nl80211_commands { 
 * here

 */

#define NL80211_CMD_SET_BSS NL80211_CMD_SET_BSS

#define NL80211_CMD_SET_MGMT_EXTRA_IE NL80211_CMD_SET_MGMT_EXTRA_IE



/**

 * enum nl80211_attrs - nl80211 netlink attributes
@@ -284,6 +295,12 @@ enum nl80211_commands { 
 *	supported interface types, each a flag attribute with the number

 *	of the interface mode.

 *

 * @NL80211_ATTR_MGMT_SUBTYPE: Management frame subtype for

 *	%NL80211_CMD_SET_MGMT_EXTRA_IE.

 *

 * @NL80211_ATTR_IE: Information element(s) data (used, e.g., with

 *	%NL80211_CMD_SET_MGMT_EXTRA_IE).

 *

 * @NL80211_ATTR_MAX: highest attribute number currently defined

 * @__NL80211_ATTR_AFTER_LAST: internal use

 */
@@ -348,6 +365,9 @@ enum nl80211_attrs { 


	NL80211_ATTR_KEY_DEFAULT_MGMT,



	NL80211_ATTR_MGMT_SUBTYPE,

	NL80211_ATTR_IE,



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



	__NL80211_ATTR_AFTER_LAST,
@@ -363,6 +383,8 @@ enum nl80211_attrs { 
#define NL80211_ATTR_WIPHY_TXQ_PARAMS NL80211_ATTR_WIPHY_TXQ_PARAMS

#define NL80211_ATTR_WIPHY_FREQ NL80211_ATTR_WIPHY_FREQ

#define NL80211_ATTR_WIPHY_CHANNEL_TYPE NL80211_ATTR_WIPHY_CHANNEL_TYPE

#define NL80211_ATTR_MGMT_SUBTYPE NL80211_ATTR_MGMT_SUBTYPE

#define NL80211_ATTR_IE NL80211_ATTR_IE



#define NL80211_MAX_SUPP_RATES			32

#define NL80211_MAX_SUPP_REG_RULES		32

include/net/cfg80211.h

+26 −0
Original line number Diff line number Diff line
@@ -433,6 +433,26 @@ struct ieee80211_txq_params { 
	u8 aifs;

};



/**

 * struct mgmt_extra_ie_params - Extra management frame IE parameters

 *

 * Used to add extra IE(s) into management frames. If the driver cannot add the

 * requested data into all management frames of the specified subtype that are

 * generated in kernel or firmware/hardware, it must reject the configuration

 * call. The IE data buffer is added to the end of the specified management

 * frame body after all other IEs. This addition is not applied to frames that

 * are injected through a monitor interface.

 *

 * @subtype: Management frame subtype

 * @ies: IE data buffer or %NULL to remove previous data

 * @ies_len: Length of @ies in octets

 */

struct mgmt_extra_ie_params {

	u8 subtype;

	u8 *ies;

	int ies_len;

};



/* from net/wireless.h */

struct wiphy;
@@ -501,6 +521,8 @@ struct ieee80211_channel; 
 * @set_txq_params: Set TX queue parameters

 *

 * @set_channel: Set channel

 *

 * @set_mgmt_extra_ie: Set extra IE data for management frames

 */

struct cfg80211_ops {

	int	(*add_virtual_intf)(struct wiphy *wiphy, char *name,
@@ -571,6 +593,10 @@ struct cfg80211_ops { 
	int	(*set_channel)(struct wiphy *wiphy,

			       struct ieee80211_channel *chan,

			       enum nl80211_channel_type channel_type);



	int	(*set_mgmt_extra_ie)(struct wiphy *wiphy,

				     struct net_device *dev,

				     struct mgmt_extra_ie_params *params);

};



/* temporary wext handlers */

net/mac80211/cfg.c

+82 −0
Original line number Diff line number Diff line
@@ -1175,6 +1175,87 @@ static int ieee80211_set_channel(struct wiphy *wiphy, 
	return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);

}



static int set_mgmt_extra_ie_sta(struct ieee80211_if_sta *ifsta, u8 subtype,

				 u8 *ies, size_t ies_len)

{

	switch (subtype) {

	case IEEE80211_STYPE_PROBE_REQ >> 4:

		kfree(ifsta->ie_probereq);

		ifsta->ie_probereq = ies;

		ifsta->ie_probereq_len = ies_len;

		return 0;

	case IEEE80211_STYPE_PROBE_RESP >> 4:

		kfree(ifsta->ie_proberesp);

		ifsta->ie_proberesp = ies;

		ifsta->ie_proberesp_len = ies_len;

		return 0;

	case IEEE80211_STYPE_AUTH >> 4:

		kfree(ifsta->ie_auth);

		ifsta->ie_auth = ies;

		ifsta->ie_auth_len = ies_len;

		return 0;

	case IEEE80211_STYPE_ASSOC_REQ >> 4:

		kfree(ifsta->ie_assocreq);

		ifsta->ie_assocreq = ies;

		ifsta->ie_assocreq_len = ies_len;

		return 0;

	case IEEE80211_STYPE_REASSOC_REQ >> 4:

		kfree(ifsta->ie_reassocreq);

		ifsta->ie_reassocreq = ies;

		ifsta->ie_reassocreq_len = ies_len;

		return 0;

	case IEEE80211_STYPE_DEAUTH >> 4:

		kfree(ifsta->ie_deauth);

		ifsta->ie_deauth = ies;

		ifsta->ie_deauth_len = ies_len;

		return 0;

	case IEEE80211_STYPE_DISASSOC >> 4:

		kfree(ifsta->ie_disassoc);

		ifsta->ie_disassoc = ies;

		ifsta->ie_disassoc_len = ies_len;

		return 0;

	}



	return -EOPNOTSUPP;

}



static int ieee80211_set_mgmt_extra_ie(struct wiphy *wiphy,

				       struct net_device *dev,

				       struct mgmt_extra_ie_params *params)

{

	struct ieee80211_sub_if_data *sdata;

	u8 *ies;

	size_t ies_len;

	int ret = -EOPNOTSUPP;



	if (params->ies) {

		ies = kmemdup(params->ies, params->ies_len, GFP_KERNEL);

		if (ies == NULL)

			return -ENOMEM;

		ies_len = params->ies_len;

	} else {

		ies = NULL;

		ies_len = 0;

	}



	sdata = IEEE80211_DEV_TO_SUB_IF(dev);



	switch (sdata->vif.type) {

	case NL80211_IFTYPE_STATION:

	case NL80211_IFTYPE_ADHOC:

		ret = set_mgmt_extra_ie_sta(&sdata->u.sta, params->subtype,

					    ies, ies_len);

		break;

	default:

		ret = -EOPNOTSUPP;

		break;

	}



	if (ret)

		kfree(ies);

	return ret;

}



struct cfg80211_ops mac80211_config_ops = {

	.add_virtual_intf = ieee80211_add_iface,

	.del_virtual_intf = ieee80211_del_iface,
@@ -1204,4 +1285,5 @@ struct cfg80211_ops mac80211_config_ops = { 
	.change_bss = ieee80211_change_bss,

	.set_txq_params = ieee80211_set_txq_params,

	.set_channel = ieee80211_set_channel,

	.set_mgmt_extra_ie = ieee80211_set_mgmt_extra_ie,

};

net/mac80211/ieee80211_i.h

+16 −0
Original line number Diff line number Diff line
@@ -331,6 +331,22 @@ struct ieee80211_if_sta { 
	u32 supp_rates_bits[IEEE80211_NUM_BANDS];



	int wmm_last_param_set;



	/* Extra IE data for management frames */

	u8 *ie_probereq;

	size_t ie_probereq_len;

	u8 *ie_proberesp;

	size_t ie_proberesp_len;

	u8 *ie_auth;

	size_t ie_auth_len;

	u8 *ie_assocreq;

	size_t ie_assocreq_len;

	u8 *ie_reassocreq;

	size_t ie_reassocreq_len;

	u8 *ie_deauth;

	size_t ie_deauth_len;

	u8 *ie_disassoc;

	size_t ie_disassoc_len;

};



struct ieee80211_if_mesh {

net/mac80211/iface.c

+7 −0
Original line number Diff line number Diff line
@@ -632,6 +632,13 @@ static void ieee80211_teardown_sdata(struct net_device *dev) 
		kfree(sdata->u.sta.assocreq_ies);

		kfree(sdata->u.sta.assocresp_ies);

		kfree_skb(sdata->u.sta.probe_resp);

		kfree(sdata->u.sta.ie_probereq);

		kfree(sdata->u.sta.ie_proberesp);

		kfree(sdata->u.sta.ie_auth);

		kfree(sdata->u.sta.ie_assocreq);

		kfree(sdata->u.sta.ie_reassocreq);

		kfree(sdata->u.sta.ie_deauth);

		kfree(sdata->u.sta.ie_disassoc);

		break;

	case NL80211_IFTYPE_WDS:

	case NL80211_IFTYPE_AP_VLAN:

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