mac80211: split IBSS/managed code

This patch splits out the ibss code and data from managed (station) mode.
The reason to do this is to better separate the state machines, and have
the code be contained better so it gets easier to determine what exactly
a given change will affect, that in turn makes it easier to understand.

This is quite some churn, especially because I split sdata->u.sta into
sdata->u.mgd and sdata->u.ibss, but I think it's easier to maintain that
way. I've also shuffled around some code -- null function sending is only
applicable to managed interfaces so put that into that file, some other
functions are needed from various places so put them into util, and also
rearranged the prototypes in ieee80211_i.h accordingly.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 22 insertions, 15 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 1327d424bf31..66f7ecf51b92 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -838,7 +838,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
 	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
 						NL80211_IFTYPE_ADHOC);
-		if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
+		if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
 			sta->last_rx = jiffies;
 	} else
 	if (!is_multicast_ether_addr(hdr->addr1) ||
@@ -1702,13 +1702,13 @@ static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
 		return;
 	}
 
-	if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 ||
-	    compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) {
+	if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
+	    compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
 		/* Not from the current AP. */
 		return;
 	}
 
-	if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) {
+	if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
 		/* Association in progress; ignore SA Query */
 		return;
 	}
@@ -1727,7 +1727,7 @@ static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
 	memset(resp, 0, 24);
 	memcpy(resp->da, mgmt->sa, ETH_ALEN);
 	memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
-	memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN);
+	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 					  IEEE80211_STYPE_ACTION);
 	skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
@@ -1745,7 +1745,6 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 {
 	struct ieee80211_local *local = rx->local;
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
-	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
 	struct ieee80211_bss *bss;
 	int len = rx->skb->len;
@@ -1803,6 +1802,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 	case WLAN_CATEGORY_SPECTRUM_MGMT:
 		if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
 			return RX_DROP_MONITOR;
+
+		if (sdata->vif.type != NL80211_IFTYPE_STATION)
+			return RX_DROP_MONITOR;
+
 		switch (mgmt->u.action.u.measurement.action_code) {
 		case WLAN_ACTION_SPCT_MSR_REQ:
 			if (len < (IEEE80211_MIN_ACTION_SIZE +
@@ -1815,12 +1818,13 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 				   sizeof(mgmt->u.action.u.chan_switch)))
 				return RX_DROP_MONITOR;
 
-			if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0)
+			if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
 				return RX_DROP_MONITOR;
 
-			bss = ieee80211_rx_bss_get(local, ifsta->bssid,
+			bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
 					   local->hw.conf.channel->center_freq,
-					   ifsta->ssid, ifsta->ssid_len);
+					   sdata->u.mgd.ssid,
+					   sdata->u.mgd.ssid_len);
 			if (!bss)
 				return RX_DROP_MONITOR;
 
@@ -1876,11 +1880,14 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
 	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
 		return RX_DROP_MONITOR;
 
-	if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
-		return RX_DROP_MONITOR;
 
-	ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
-	return RX_QUEUED;
+	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+		if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
+			return RX_DROP_MONITOR;
+		return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
+	}
+
+	return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status);
 }
 
 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
@@ -2083,7 +2090,7 @@ static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
 	case NL80211_IFTYPE_STATION:
 		if (!bssid)
 			return 0;
-		if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
+		if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
 			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
 				return 0;
 			rx->flags &= ~IEEE80211_RX_RA_MATCH;
@@ -2101,7 +2108,7 @@ static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
 		if (ieee80211_is_beacon(hdr->frame_control)) {
 			return 1;
 		}
-		else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
+		else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
 			if (!(rx->flags & IEEE80211_RX_IN_SCAN))
 				return 0;
 			rx->flags &= ~IEEE80211_RX_RA_MATCH;