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Commit 4fd6931e authored by Johannes Berg's avatar Johannes Berg Committed by David S. Miller
Browse files

mac80211: implement cfg80211 station handling 



This implements station handling from userspace via cfg80211
in mac80211.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 5dfdaf58

net/mac80211/cfg.c

+192 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <net/cfg80211.h>

#include "ieee80211_i.h"

#include "cfg.h"

#include "ieee80211_rate.h"



static enum ieee80211_if_types

nl80211_type_to_mac80211_type(enum nl80211_iftype type)
@@ -447,6 +448,194 @@ static int ieee80211_del_beacon(struct wiphy *wiphy, struct net_device *dev) 
	return ieee80211_if_config_beacon(dev);

}



/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */

struct iapp_layer2_update {

	u8 da[ETH_ALEN];	/* broadcast */

	u8 sa[ETH_ALEN];	/* STA addr */

	__be16 len;		/* 6 */

	u8 dsap;		/* 0 */

	u8 ssap;		/* 0 */

	u8 control;

	u8 xid_info[3];

} __attribute__ ((packed));



static void ieee80211_send_layer2_update(struct sta_info *sta)

{

	struct iapp_layer2_update *msg;

	struct sk_buff *skb;



	/* Send Level 2 Update Frame to update forwarding tables in layer 2

	 * bridge devices */



	skb = dev_alloc_skb(sizeof(*msg));

	if (!skb)

		return;

	msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));



	/* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)

	 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */



	memset(msg->da, 0xff, ETH_ALEN);

	memcpy(msg->sa, sta->addr, ETH_ALEN);

	msg->len = htons(6);

	msg->dsap = 0;

	msg->ssap = 0x01;	/* NULL LSAP, CR Bit: Response */

	msg->control = 0xaf;	/* XID response lsb.1111F101.

				 * F=0 (no poll command; unsolicited frame) */

	msg->xid_info[0] = 0x81;	/* XID format identifier */

	msg->xid_info[1] = 1;	/* LLC types/classes: Type 1 LLC */

	msg->xid_info[2] = 0;	/* XID sender's receive window size (RW) */



	skb->dev = sta->dev;

	skb->protocol = eth_type_trans(skb, sta->dev);

	memset(skb->cb, 0, sizeof(skb->cb));

	netif_rx(skb);

}



static void sta_apply_parameters(struct ieee80211_local *local,

				 struct sta_info *sta,

				 struct station_parameters *params)

{

	u32 rates;

	int i, j;

	struct ieee80211_hw_mode *mode;



	if (params->station_flags & STATION_FLAG_CHANGED) {

		sta->flags &= ~WLAN_STA_AUTHORIZED;

		if (params->station_flags & STATION_FLAG_AUTHORIZED)

			sta->flags |= WLAN_STA_AUTHORIZED;



		sta->flags &= ~WLAN_STA_SHORT_PREAMBLE;

		if (params->station_flags & STATION_FLAG_SHORT_PREAMBLE)

			sta->flags |= WLAN_STA_SHORT_PREAMBLE;



		sta->flags &= ~WLAN_STA_WME;

		if (params->station_flags & STATION_FLAG_WME)

			sta->flags |= WLAN_STA_WME;

	}



	if (params->aid) {

		sta->aid = params->aid;

		if (sta->aid > IEEE80211_MAX_AID)

			sta->aid = 0; /* XXX: should this be an error? */

	}



	if (params->listen_interval >= 0)

		sta->listen_interval = params->listen_interval;



	if (params->supported_rates) {

		rates = 0;

		mode = local->oper_hw_mode;

		for (i = 0; i < params->supported_rates_len; i++) {

			int rate = (params->supported_rates[i] & 0x7f) * 5;

			for (j = 0; j < mode->num_rates; j++) {

				if (mode->rates[j].rate == rate)

					rates |= BIT(j);

			}

		}

		sta->supp_rates = rates;

	}

}



static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,

				 u8 *mac, struct station_parameters *params)

{

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct sta_info *sta;

	struct ieee80211_sub_if_data *sdata;



	/* Prevent a race with changing the rate control algorithm */

	if (!netif_running(dev))

		return -ENETDOWN;



	/* XXX: get sta belonging to dev */

	sta = sta_info_get(local, mac);

	if (sta) {

		sta_info_put(sta);

		return -EEXIST;

	}



	if (params->vlan) {

		sdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);



		if (sdata->vif.type != IEEE80211_IF_TYPE_VLAN ||

		    sdata->vif.type != IEEE80211_IF_TYPE_AP)

			return -EINVAL;

	} else

		sdata = IEEE80211_DEV_TO_SUB_IF(dev);



	sta = sta_info_add(local, dev, mac, GFP_KERNEL);

	if (!sta)

		return -ENOMEM;



	sta->dev = sdata->dev;

	if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN ||

	    sdata->vif.type == IEEE80211_IF_TYPE_AP)

		ieee80211_send_layer2_update(sta);



	sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;



	sta_apply_parameters(local, sta, params);



	rate_control_rate_init(sta, local);



	sta_info_put(sta);



	return 0;

}



static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,

				 u8 *mac)

{

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct sta_info *sta;



	if (mac) {

		/* XXX: get sta belonging to dev */

		sta = sta_info_get(local, mac);

		if (!sta)

			return -ENOENT;



		sta_info_free(sta);

		sta_info_put(sta);

	} else

		sta_info_flush(local, dev);



	return 0;

}



static int ieee80211_change_station(struct wiphy *wiphy,

				    struct net_device *dev,

				    u8 *mac,

				    struct station_parameters *params)

{

	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	struct sta_info *sta;

	struct ieee80211_sub_if_data *vlansdata;



	/* XXX: get sta belonging to dev */

	sta = sta_info_get(local, mac);

	if (!sta)

		return -ENOENT;



	if (params->vlan && params->vlan != sta->dev) {

		vlansdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);



		if (vlansdata->vif.type != IEEE80211_IF_TYPE_VLAN ||

		    vlansdata->vif.type != IEEE80211_IF_TYPE_AP)

			return -EINVAL;



		sta->dev = params->vlan;

		ieee80211_send_layer2_update(sta);

	}



	sta_apply_parameters(local, sta, params);



	sta_info_put(sta);



	return 0;

}



struct cfg80211_ops mac80211_config_ops = {

	.add_virtual_intf = ieee80211_add_iface,

	.del_virtual_intf = ieee80211_del_iface,
@@ -458,5 +647,8 @@ struct cfg80211_ops mac80211_config_ops = { 
	.add_beacon = ieee80211_add_beacon,

	.set_beacon = ieee80211_set_beacon,

	.del_beacon = ieee80211_del_beacon,

	.add_station = ieee80211_add_station,

	.del_station = ieee80211_del_station,

	.change_station = ieee80211_change_station,

	.get_station = ieee80211_get_station,

};