[PATCH v2 1/5] cfg80211: Parsing of Multiple BSSID information in scanning

[PATCH v2 1/5] cfg80211: Parsing of Multiple BSSID information in scanning

[Jouni Malinen]

From: Peng Xu <pxu@codeaurora.org>

This extends cfg80211 BSS table processing to be able to parse Multiple
BSSID element from Beacon and Probe Response frames and to update the
BSS profiles in internal database for non-transmitted BSSs.

Signed-off-by: Peng Xu <pxu@codeaurora.org>
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 net/wireless/core.h |   1 +
 net/wireless/scan.c | 508 ++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 470 insertions(+), 39 deletions(-)

v2:
- add missing rcu_read_unlock() calls to address kbuild report

diff --git a/net/wireless/core.h b/net/wireless/core.h
index c5d6f34..d58c56a 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -152,6 +152,7 @@ extern int cfg80211_rdev_list_generation;
 struct cfg80211_internal_bss {
 	struct list_head list;
 	struct list_head hidden_list;
+	struct list_head nontrans_list;
 	struct rb_node rbn;
 	u64 ts_boottime;
 	unsigned long ts;
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 5123667..b192388 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -4,7 +4,7 @@
  *
  * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
- * Copyright 2016	Intel Deutschland GmbH
+ * Copyright 2016-2017	Intel Deutschland GmbH
  */
 #include <linux/kernel.h>
 #include <linux/slab.h>
@@ -150,6 +150,7 @@ static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 	}
 
 	list_del_init(&bss->list);
+	list_del_init(&bss->nontrans_list);
 	rb_erase(&bss->rbn, &rdev->bss_tree);
 	rdev->bss_entries--;
 	WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
@@ -159,6 +160,172 @@ static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 	return true;
 }
 
+static void cfg80211_gen_new_bssid(const u8 *bssid, u8 max_bssid,
+				   u8 mbssid_index, u8 *new_bssid_addr)
+{
+	u64 bssid_tmp, new_bssid = 0;
+	u64 lsb_n;
+
+	bssid_tmp = ether_addr_to_u64(bssid);
+
+	lsb_n = bssid_tmp & ((1 << max_bssid) - 1);
+	new_bssid = bssid_tmp;
+	new_bssid &= ~((1 << max_bssid) - 1);
+	new_bssid |= (lsb_n + mbssid_index) % (1 << max_bssid);
+
+	u64_to_ether_addr(new_bssid, new_bssid_addr);
+}
+
+static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
+				  const u8 *subelement, size_t subie_len,
+				  u8 *new_ie, gfp_t gfp)
+{
+	u8 *pos, *tmp;
+	const u8 *tmp_old, *tmp_new;
+	u8 *sub_copy;
+
+	/* copy subelement as we need to change its content to
+	 * mark an ie after it is processed.
+	 */
+	sub_copy = kmalloc(subie_len, gfp);
+	if (!sub_copy)
+		return 0;
+	memcpy(sub_copy, subelement, subie_len);
+
+	pos = &new_ie[0];
+
+	/* set new ssid */
+	tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
+	if (tmp_new) {
+		memcpy(pos, tmp_new, tmp_new[1] + 2);
+		pos += (tmp_new[1] + 2);
+	}
+
+	/* go through IEs in ie (skip SSID) and subelement,
+	 * merge them into new_ie
+	 */
+	tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
+	tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
+
+	while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
+		if (tmp_old[0] == 0) {
+			tmp_old++;
+			continue;
+		}
+
+		tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, subie_len);
+		if (!tmp) {
+			/* ie in old ie but not in subelement */
+			if (tmp_old[0] != WLAN_EID_MULTIPLE_BSSID) {
+				memcpy(pos, tmp_old, tmp_old[1] + 2);
+				pos += tmp_old[1] + 2;
+			}
+		} else {
+			/* ie in transmitting ie also in subelement,
+			 * copy from subelement and flag the ie in subelement
+			 * as copied (by setting eid field to 0xff). For
+			 * vendor ie, compare OUI + type + subType to
+			 * determine if they are the same ie.
+			 */
+			if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
+				if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
+					/* same vendor ie, copy from
+					 * subelement
+					 */
+					memcpy(pos, tmp, tmp[1] + 2);
+					pos += tmp[1] + 2;
+					tmp[0] = 0xff;
+				} else {
+					memcpy(pos, tmp_old, tmp_old[1] + 2);
+					pos += tmp_old[1] + 2;
+				}
+			} else {
+				/* copy ie from subelement into new ie */
+				memcpy(pos, tmp, tmp[1] + 2);
+				pos += tmp[1] + 2;
+				tmp[0] = 0xff;
+			}
+		}
+
+		if (tmp_old + tmp_old[1] + 2 - ie == ielen)
+			break;
+
+		tmp_old += tmp_old[1] + 2;
+	}
+
+	/* go through subelement again to check if there is any ie not
+	 * copied to new ie, skip ssid, capability, bssid-index ie
+	 */
+	tmp_new = sub_copy;
+	while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
+		if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
+		      tmp_new[0] == WLAN_EID_SSID ||
+		      tmp_new[0] == WLAN_EID_MULTI_BSSID_IDX ||
+		      tmp_new[0] == 0xff)) {
+			memcpy(pos, tmp_new, tmp_new[1] + 2);
+			pos += tmp_new[1] + 2;
+		}
+		if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
+			break;
+		tmp_new += tmp_new[1] + 2;
+	}
+
+	kfree(sub_copy);
+	return pos - new_ie;
+}
+
+static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
+		   const u8 *ssid, size_t ssid_len)
+{
+	const struct cfg80211_bss_ies *ies;
+	const u8 *ssidie;
+
+	if (bssid && !ether_addr_equal(a->bssid, bssid))
+		return false;
+
+	if (!ssid)
+		return true;
+
+	ies = rcu_access_pointer(a->ies);
+	if (!ies)
+		return false;
+	ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+	if (!ssidie)
+		return false;
+	if (ssidie[1] != ssid_len)
+		return false;
+	return memcmp(ssidie + 2, ssid, ssid_len) == 0;
+}
+
+static int
+cfg80211_add_nontrans_list(struct cfg80211_internal_bss *trans_bss,
+			   struct cfg80211_internal_bss *nontrans_bss)
+{
+	const u8 *ssid;
+	size_t ssid_len;
+	struct cfg80211_internal_bss *bss = NULL;
+
+	rcu_read_lock();
+	ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID);
+	if (!ssid) {
+		rcu_read_unlock();
+		return -EINVAL;
+	}
+	ssid_len = ssid[1];
+	ssid = ssid + 2;
+	rcu_read_unlock();
+
+	/* check if nontrans_bss is in the list */
+	list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
+		if (is_bss(&bss->pub, nontrans_bss->pub.bssid, ssid, ssid_len))
+			return 0;
+	}
+
+	/* add to the list */
+	list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
+	return 0;
+}
+
 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
 				  unsigned long expire_time)
 {
@@ -525,29 +692,6 @@ const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
 }
 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
 
-static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
-		   const u8 *ssid, size_t ssid_len)
-{
-	const struct cfg80211_bss_ies *ies;
-	const u8 *ssidie;
-
-	if (bssid && !ether_addr_equal(a->bssid, bssid))
-		return false;
-
-	if (!ssid)
-		return true;
-
-	ies = rcu_access_pointer(a->ies);
-	if (!ies)
-		return false;
-	ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
-	if (!ssidie)
-		return false;
-	if (ssidie[1] != ssid_len)
-		return false;
-	return memcmp(ssidie + 2, ssid, ssid_len) == 0;
-}
-
 /**
  * enum bss_compare_mode - BSS compare mode
  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
@@ -1130,17 +1274,19 @@ cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
 }
 
 /* Returned bss is reference counted and must be cleaned up appropriately. */
-struct cfg80211_bss *
-cfg80211_inform_bss_data(struct wiphy *wiphy,
-			 struct cfg80211_inform_bss *data,
-			 enum cfg80211_bss_frame_type ftype,
-			 const u8 *bssid, u64 tsf, u16 capability,
-			 u16 beacon_interval, const u8 *ie, size_t ielen,
-			 gfp_t gfp)
+static struct cfg80211_bss *
+cfg80211_inform_single_bss_data(struct wiphy *wiphy,
+				struct cfg80211_inform_bss *data,
+				enum cfg80211_bss_frame_type ftype,
+				const u8 *bssid, u64 tsf, u16 capability,
+				u16 beacon_interval, const u8 *ie, size_t ielen,
+				struct cfg80211_bss *trans_bss,
+				gfp_t gfp)
 {
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 	struct cfg80211_bss_ies *ies;
 	struct ieee80211_channel *channel;
-	struct cfg80211_internal_bss tmp = {}, *res;
+	struct cfg80211_internal_bss tmp = {}, *res, *trans_internal;
 	int bss_type;
 	bool signal_valid;
 
@@ -1209,19 +1355,252 @@ cfg80211_inform_bss_data(struct wiphy *wiphy,
 			regulatory_hint_found_beacon(wiphy, channel, gfp);
 	}
 
+	if (trans_bss) {
+		/* this is a nontransmitting bss, we need to add it to
+		 * transmitting bss' list if it is not there
+		 */
+		trans_internal = container_of(trans_bss,
+					      struct cfg80211_internal_bss,
+					      pub);
+		if (cfg80211_add_nontrans_list(trans_internal, res)) {
+			if (__cfg80211_unlink_bss(rdev, res))
+				rdev->bss_generation++;
+		}
+	}
+
 	trace_cfg80211_return_bss(&res->pub);
 	/* cfg80211_bss_update gives us a referenced result */
 	return &res->pub;
 }
-EXPORT_SYMBOL(cfg80211_inform_bss_data);
 
-/* cfg80211_inform_bss_width_frame helper */
+static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
+				       struct cfg80211_inform_bss *data,
+				       enum cfg80211_bss_frame_type ftype,
+				       const u8 *bssid, u64 tsf,
+				       u16 beacon_interval, const u8 *ie,
+				       size_t ielen,
+				       struct cfg80211_bss *trans_bss,
+				       gfp_t gfp)
+{
+	const u8 *pos, *subelement, *mbssid_end_pos;
+	const u8 *tmp, *mbssid_index_ie;
+	size_t subie_len, new_ie_len;
+	u8 new_bssid[ETH_ALEN];
+	u8 *new_ie;
+	u16 capability;
+	struct cfg80211_bss *bss;
+
+	if (!trans_bss)
+		return;
+	if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
+		return;
+
+	pos = ie;
+
+	new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
+	if (!new_ie)
+		return;
+
+	while (pos < ie + ielen + 2) {
+		tmp = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, pos,
+				       ielen - (pos - ie));
+		if (!tmp)
+			break;
+
+		mbssid_end_pos = tmp + tmp[1] + 2;
+		/* Skip Element ID, Len, MaxBSSID Indicator */
+		if (tmp[1] < 4)
+			break;
+		for (subelement = tmp + 3; subelement < mbssid_end_pos - 1;
+		     subelement += 2 + subelement[1]) {
+			subie_len = subelement[1];
+			if (mbssid_end_pos - subelement < 2 + subie_len)
+				break;
+			if (subelement[0] != 0 || subelement[1] < 4) {
+				/* not a valid BSS profile */
+				continue;
+			}
+
+			if (subelement[2] != WLAN_EID_NON_TX_BSSID_CAP ||
+			    subelement[3] != 2) {
+				/* The first element within the Nontransmitted
+				 * BSSID Profile is not the Nontransmitted
+				 * BSSID Capability element.
+				 */
+				continue;
+			}
+
+			/* found a Nontransmitted BSSID Profile */
+			mbssid_index_ie = cfg80211_find_ie
+				(WLAN_EID_MULTI_BSSID_IDX,
+				 subelement + 2, subie_len);
+			if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
+			    mbssid_index_ie[2] == 0) {
+				/* No valid Multiple BSSID-Index element */
+				continue;
+			}
+
+			cfg80211_gen_new_bssid(bssid, tmp[2],
+					       mbssid_index_ie[2],
+					       new_bssid);
+			memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
+			new_ie_len = cfg80211_gen_new_ie(ie, ielen,
+							 subelement + 2,
+							 subie_len, new_ie,
+							 gfp);
+			if (!new_ie_len)
+				continue;
+
+			capability = le16_to_cpup((const __le16 *)
+						  &subelement[4]);
+			bss = cfg80211_inform_single_bss_data(wiphy, data,
+							      ftype,
+							      new_bssid, tsf,
+							      capability,
+							      beacon_interval,
+							      new_ie,
+							      new_ie_len,
+							      trans_bss, gfp);
+			if (!bss)
+				break;
+			cfg80211_put_bss(wiphy, bss);
+		}
+
+		pos = mbssid_end_pos;
+	}
+
+	kfree(new_ie);
+}
+
 struct cfg80211_bss *
-cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
-			       struct cfg80211_inform_bss *data,
-			       struct ieee80211_mgmt *mgmt, size_t len,
-			       gfp_t gfp)
+cfg80211_inform_bss_data(struct wiphy *wiphy,
+			 struct cfg80211_inform_bss *data,
+			 enum cfg80211_bss_frame_type ftype,
+			 const u8 *bssid, u64 tsf, u16 capability,
+			 u16 beacon_interval, const u8 *ie, size_t ielen,
+			 gfp_t gfp)
+{
+	struct cfg80211_bss *res;
+
+	res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
+					      capability, beacon_interval, ie,
+					      ielen, NULL, gfp);
+	cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
+				   beacon_interval, ie, ielen, res, gfp);
+	return res;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_data);
 
+static void
+cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
+				 struct cfg80211_inform_bss *data,
+				 struct ieee80211_mgmt *mgmt, size_t len,
+				 struct cfg80211_bss *trans_bss,
+				 gfp_t gfp)
+{
+	enum cfg80211_bss_frame_type ftype;
+	const u8 *ie = mgmt->u.probe_resp.variable;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+
+	ftype = ieee80211_is_beacon(mgmt->frame_control) ?
+		CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
+
+	cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
+				   le64_to_cpu(mgmt->u.probe_resp.timestamp),
+				   le16_to_cpu(mgmt->u.probe_resp.beacon_int),
+				   ie, ielen, trans_bss, gfp);
+}
+
+static void
+cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
+				   struct cfg80211_internal_bss *nontrans_bss,
+				   struct ieee80211_mgmt *mgmt, size_t len,
+				   gfp_t gfp)
+{
+	u8 *ie, *new_ie, *pos;
+	const u8 *nontrans_ssid, *trans_ssid, *mbssid;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+	size_t new_ie_len;
+	struct cfg80211_bss_ies *new_ies;
+	const struct cfg80211_bss_ies *old;
+	u8 cpy_len;
+
+	ie = mgmt->u.probe_resp.variable;
+
+	new_ie_len = ielen;
+	trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
+	if (!trans_ssid)
+		return;
+	new_ie_len -= trans_ssid[1];
+	mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
+	if (!mbssid)
+		return;
+	new_ie_len -= mbssid[1];
+	rcu_read_lock();
+	nontrans_ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID);
+	if (!nontrans_ssid) {
+		rcu_read_unlock();
+		return;
+	}
+	new_ie_len += nontrans_ssid[1];
+	rcu_read_unlock();
+
+	/* generate new ie for nontrans BSS
+	 * 1. replace SSID with nontrans BSS' SSID
+	 * 2. skip MBSSID IE
+	 */
+	new_ie = kzalloc(new_ie_len, gfp);
+	if (!new_ie)
+		return;
+	new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
+	if (!new_ies) {
+		kfree(new_ie);
+		return;
+	}
+
+	pos = new_ie;
+
+	/* copy the nontransmitted SSID */
+	cpy_len = nontrans_ssid[1] + 2;
+	memcpy(pos, nontrans_ssid, cpy_len);
+	pos += cpy_len;
+	/* copy the IEs between SSID and MBSSID */
+	cpy_len = trans_ssid[1] + 2;
+	memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
+	pos += (mbssid - (trans_ssid + cpy_len));
+	/* copy the IEs after MBSSID */
+	cpy_len = mbssid[1] + 2;
+	memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
+
+	/* update ie */
+	new_ies->len = new_ie_len;
+	new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+	new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
+	memcpy(new_ies->data, new_ie, new_ie_len);
+	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
+		old = rcu_access_pointer(nontrans_bss->pub.proberesp_ies);
+		rcu_assign_pointer(nontrans_bss->pub.proberesp_ies, new_ies);
+		rcu_assign_pointer(nontrans_bss->pub.ies, new_ies);
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	} else {
+		old = rcu_access_pointer(nontrans_bss->pub.beacon_ies);
+		rcu_assign_pointer(nontrans_bss->pub.beacon_ies, new_ies);
+		rcu_assign_pointer(nontrans_bss->pub.ies, new_ies);
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	}
+}
+
+/* cfg80211_inform_bss_width_frame helper */
+static struct cfg80211_bss *
+cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
+				      struct cfg80211_inform_bss *data,
+				      struct ieee80211_mgmt *mgmt, size_t len,
+				      struct cfg80211_bss *trans_bss,
+				      gfp_t gfp)
 {
 	struct cfg80211_internal_bss tmp = {}, *res;
 	struct cfg80211_bss_ies *ies;
@@ -1300,6 +1679,50 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
 	/* cfg80211_bss_update gives us a referenced result */
 	return &res->pub;
 }
+
+struct cfg80211_bss *
+cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
+			       struct cfg80211_inform_bss *data,
+			       struct ieee80211_mgmt *mgmt, size_t len,
+			       gfp_t gfp)
+{
+	struct cfg80211_bss *res;
+	struct cfg80211_internal_bss *trans_bss, *tmp_bss;
+	const u8 *ie = mgmt->u.probe_resp.variable;
+	const struct cfg80211_bss_ies *ies1, *ies2;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+
+	res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
+						    len, NULL, gfp);
+	if (!res || !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
+		return res;
+
+	/* process each non-transmitting bss */
+	cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, res, gfp);
+
+	/* check if the res has other nontransmitting bss which is not
+	 * in MBSSID IE
+	 */
+	ies1 = rcu_access_pointer(res->ies);
+	trans_bss = container_of(res, struct cfg80211_internal_bss, pub);
+	if (!trans_bss)
+		return res;
+
+	/* go through nontrans_list, if the timestamp of the BSS is
+	 * earlier than the timestamp of the transmitting BSS then
+	 * update it
+	 */
+	list_for_each_entry(tmp_bss, &trans_bss->nontrans_list,
+			    nontrans_list) {
+		ies2 = rcu_access_pointer(tmp_bss->pub.ies);
+		if (ies2->tsf < ies1->tsf)
+			cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
+							   mgmt, len, gfp);
+	}
+
+	return res;
+}
 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
 
 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
@@ -1337,7 +1760,7 @@ EXPORT_SYMBOL(cfg80211_put_bss);
 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
-	struct cfg80211_internal_bss *bss;
+	struct cfg80211_internal_bss *bss, *nontrans_bss, *tmp;
 
 	if (WARN_ON(!pub))
 		return;
@@ -1346,6 +1769,13 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 
 	spin_lock_bh(&rdev->bss_lock);
 	if (!list_empty(&bss->list)) {
+		list_for_each_entry_safe(nontrans_bss, tmp,
+					 &bss->nontrans_list,
+					 nontrans_list) {
+			if (__cfg80211_unlink_bss(rdev, nontrans_bss))
+				rdev->bss_generation++;
+		}
+
 		if (__cfg80211_unlink_bss(rdev, bss))
 			rdev->bss_generation++;
 	}
-- 
2.7.4

[PATCH v2 2/5] cfg80211: Properly track transmitting and non-transmitting BSS

[Jouni Malinen]

From: Sara Sharon <sara.sharon@intel.com>

When holding data of the non-transmitting BSS, we need to keep the
transmitting BSS data on. Otherwise it will be released, and release
the non-transmitting BSS with it.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 net/wireless/core.h | 12 ++++++++++++
 net/wireless/scan.c | 36 ++++++++++++++++++++++++++++++++++--
 2 files changed, 46 insertions(+), 2 deletions(-)

v2:
- avoid recursive calls within inline functions to address kbuild
  warnings

diff --git a/net/wireless/core.h b/net/wireless/core.h
index d58c56a..eb8e90b 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -153,6 +153,7 @@ struct cfg80211_internal_bss {
 	struct list_head list;
 	struct list_head hidden_list;
 	struct list_head nontrans_list;
+	struct cfg80211_bss *transmitted_bss;
 	struct rb_node rbn;
 	u64 ts_boottime;
 	unsigned long ts;
@@ -183,12 +184,23 @@ static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pu
 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 {
 	atomic_inc(&bss->hold);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		atomic_inc(&bss->hold);
+	}
 }
 
 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 {
 	int r = atomic_dec_return(&bss->hold);
 	WARN_ON(r < 0);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		r = atomic_dec_return(&bss->hold);
+		WARN_ON(r < 0);
+	}
 }
 
 
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index b192388..aa102c8 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -109,6 +109,12 @@ static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 				   pub);
 		bss->refcount++;
 	}
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss,
+				   pub);
+		bss->refcount++;
+	}
 }
 
 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
@@ -125,6 +131,18 @@ static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 		if (hbss->refcount == 0)
 			bss_free(hbss);
 	}
+
+	if (bss->transmitted_bss) {
+		struct cfg80211_internal_bss *tbss;
+
+		tbss = container_of(bss->transmitted_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+		tbss->refcount--;
+		if (tbss->refcount == 0)
+			bss_free(tbss);
+	}
+
 	bss->refcount--;
 	if (bss->refcount == 0)
 		bss_free(bss);
@@ -1030,6 +1048,7 @@ static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
 static struct cfg80211_internal_bss *
 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 		    struct cfg80211_internal_bss *tmp,
+		    struct cfg80211_bss *trans_bss,
 		    bool signal_valid)
 {
 	struct cfg80211_internal_bss *found = NULL;
@@ -1186,6 +1205,17 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 			goto drop;
 		}
 
+		/* This must be before the call to bss_ref_get */
+		if (trans_bss) {
+			struct cfg80211_internal_bss *pbss =
+				container_of(trans_bss,
+					     struct cfg80211_internal_bss,
+					     pub);
+
+			new->transmitted_bss = trans_bss;
+			bss_ref_get(rdev, pbss);
+		}
+
 		list_add_tail(&new->list, &rdev->bss_list);
 		rdev->bss_entries++;
 		rb_insert_bss(rdev, new);
@@ -1341,7 +1371,8 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;
 
@@ -1661,7 +1692,8 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;
 
-- 
2.7.4

[PATCH v2 3/5] cfg80211: Move Multiple BSS info to struct cfg80211_bss to be visible

[Jouni Malinen]

From: Sara Sharon <sara.sharon@intel.com>

Previously the transmitted BSS and the non-trasmitted BSS list were
defined in struct cfg80211_internal_bss. Move them to struct cfg80211_bss
since mac80211 needs this info.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 include/net/cfg80211.h |  2 ++
 net/wireless/core.h    | 10 +++----
 net/wireless/scan.c    | 79 +++++++++++++++++++++++++-------------------------
 3 files changed, 45 insertions(+), 46 deletions(-)

v2:
- rebased on top of changes in previous patches

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index e0c41eb..17cfc33 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2021,6 +2021,8 @@ struct cfg80211_bss {
 	const struct cfg80211_bss_ies __rcu *proberesp_ies;
 
 	struct cfg80211_bss *hidden_beacon_bss;
+	struct cfg80211_bss *transmitted_bss;
+	struct list_head nontrans_list;
 
 	s32 signal;
 
diff --git a/net/wireless/core.h b/net/wireless/core.h
index eb8e90b..236b676 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -152,8 +152,6 @@ extern int cfg80211_rdev_list_generation;
 struct cfg80211_internal_bss {
 	struct list_head list;
 	struct list_head hidden_list;
-	struct list_head nontrans_list;
-	struct cfg80211_bss *transmitted_bss;
 	struct rb_node rbn;
 	u64 ts_boottime;
 	unsigned long ts;
@@ -184,8 +182,8 @@ static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pu
 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 {
 	atomic_inc(&bss->hold);
-	if (bss->transmitted_bss) {
-		bss = container_of(bss->transmitted_bss,
+	if (bss->pub.transmitted_bss) {
+		bss = container_of(bss->pub.transmitted_bss,
 				   struct cfg80211_internal_bss, pub);
 		atomic_inc(&bss->hold);
 	}
@@ -195,8 +193,8 @@ static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 {
 	int r = atomic_dec_return(&bss->hold);
 	WARN_ON(r < 0);
-	if (bss->transmitted_bss) {
-		bss = container_of(bss->transmitted_bss,
+	if (bss->pub.transmitted_bss) {
+		bss = container_of(bss->pub.transmitted_bss,
 				   struct cfg80211_internal_bss, pub);
 		r = atomic_dec_return(&bss->hold);
 		WARN_ON(r < 0);
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index aa102c8..4c8b12c 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -109,8 +109,8 @@ static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 				   pub);
 		bss->refcount++;
 	}
-	if (bss->transmitted_bss) {
-		bss = container_of(bss->transmitted_bss,
+	if (bss->pub.transmitted_bss) {
+		bss = container_of(bss->pub.transmitted_bss,
 				   struct cfg80211_internal_bss,
 				   pub);
 		bss->refcount++;
@@ -132,10 +132,10 @@ static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 			bss_free(hbss);
 	}
 
-	if (bss->transmitted_bss) {
+	if (bss->pub.transmitted_bss) {
 		struct cfg80211_internal_bss *tbss;
 
-		tbss = container_of(bss->transmitted_bss,
+		tbss = container_of(bss->pub.transmitted_bss,
 				    struct cfg80211_internal_bss,
 				    pub);
 		tbss->refcount--;
@@ -168,7 +168,7 @@ static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 	}
 
 	list_del_init(&bss->list);
-	list_del_init(&bss->nontrans_list);
+	list_del_init(&bss->pub.nontrans_list);
 	rb_erase(&bss->rbn, &rdev->bss_tree);
 	rdev->bss_entries--;
 	WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
@@ -316,15 +316,15 @@ static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
 }
 
 static int
-cfg80211_add_nontrans_list(struct cfg80211_internal_bss *trans_bss,
-			   struct cfg80211_internal_bss *nontrans_bss)
+cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
+			   struct cfg80211_bss *nontrans_bss)
 {
 	const u8 *ssid;
 	size_t ssid_len;
-	struct cfg80211_internal_bss *bss = NULL;
+	struct cfg80211_bss *bss = NULL;
 
 	rcu_read_lock();
-	ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID);
+	ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
 	if (!ssid) {
 		rcu_read_unlock();
 		return -EINVAL;
@@ -335,7 +335,7 @@ cfg80211_add_nontrans_list(struct cfg80211_internal_bss *trans_bss,
 
 	/* check if nontrans_bss is in the list */
 	list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
-		if (is_bss(&bss->pub, nontrans_bss->pub.bssid, ssid, ssid_len))
+		if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
 			return 0;
 	}
 
@@ -1172,6 +1172,7 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 		memcpy(new, tmp, sizeof(*new));
 		new->refcount = 1;
 		INIT_LIST_HEAD(&new->hidden_list);
+		INIT_LIST_HEAD(&new->pub.nontrans_list);
 
 		if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
 			hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
@@ -1212,7 +1213,7 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 					     struct cfg80211_internal_bss,
 					     pub);
 
-			new->transmitted_bss = trans_bss;
+			new->pub.transmitted_bss = trans_bss;
 			bss_ref_get(rdev, pbss);
 		}
 
@@ -1316,7 +1317,7 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 	struct cfg80211_bss_ies *ies;
 	struct ieee80211_channel *channel;
-	struct cfg80211_internal_bss tmp = {}, *res, *trans_internal;
+	struct cfg80211_internal_bss tmp = {}, *res;
 	int bss_type;
 	bool signal_valid;
 
@@ -1390,10 +1391,7 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 		/* this is a nontransmitting bss, we need to add it to
 		 * transmitting bss' list if it is not there
 		 */
-		trans_internal = container_of(trans_bss,
-					      struct cfg80211_internal_bss,
-					      pub);
-		if (cfg80211_add_nontrans_list(trans_internal, res)) {
+		if (cfg80211_add_nontrans_list(trans_bss, &res->pub)) {
 			if (__cfg80211_unlink_bss(rdev, res))
 				rdev->bss_generation++;
 		}
@@ -1545,7 +1543,7 @@ cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
 
 static void
 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
-				   struct cfg80211_internal_bss *nontrans_bss,
+				   struct cfg80211_bss *nontrans_bss,
 				   struct ieee80211_mgmt *mgmt, size_t len,
 				   gfp_t gfp)
 {
@@ -1570,7 +1568,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 		return;
 	new_ie_len -= mbssid[1];
 	rcu_read_lock();
-	nontrans_ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID);
+	nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
 	if (!nontrans_ssid) {
 		rcu_read_unlock();
 		return;
@@ -1611,15 +1609,15 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
 	memcpy(new_ies->data, new_ie, new_ie_len);
 	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
-		old = rcu_access_pointer(nontrans_bss->pub.proberesp_ies);
-		rcu_assign_pointer(nontrans_bss->pub.proberesp_ies, new_ies);
-		rcu_assign_pointer(nontrans_bss->pub.ies, new_ies);
+		old = rcu_access_pointer(nontrans_bss->proberesp_ies);
+		rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
+		rcu_assign_pointer(nontrans_bss->ies, new_ies);
 		if (old)
 			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
 	} else {
-		old = rcu_access_pointer(nontrans_bss->pub.beacon_ies);
-		rcu_assign_pointer(nontrans_bss->pub.beacon_ies, new_ies);
-		rcu_assign_pointer(nontrans_bss->pub.ies, new_ies);
+		old = rcu_access_pointer(nontrans_bss->beacon_ies);
+		rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
+		rcu_assign_pointer(nontrans_bss->ies, new_ies);
 		if (old)
 			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
 	}
@@ -1718,8 +1716,7 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
 			       struct ieee80211_mgmt *mgmt, size_t len,
 			       gfp_t gfp)
 {
-	struct cfg80211_bss *res;
-	struct cfg80211_internal_bss *trans_bss, *tmp_bss;
+	struct cfg80211_bss *res, *tmp_bss;
 	const u8 *ie = mgmt->u.probe_resp.variable;
 	const struct cfg80211_bss_ies *ies1, *ies2;
 	size_t ielen = len - offsetof(struct ieee80211_mgmt,
@@ -1737,17 +1734,14 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
 	 * in MBSSID IE
 	 */
 	ies1 = rcu_access_pointer(res->ies);
-	trans_bss = container_of(res, struct cfg80211_internal_bss, pub);
-	if (!trans_bss)
-		return res;
 
 	/* go through nontrans_list, if the timestamp of the BSS is
 	 * earlier than the timestamp of the transmitting BSS then
 	 * update it
 	 */
-	list_for_each_entry(tmp_bss, &trans_bss->nontrans_list,
+	list_for_each_entry(tmp_bss, &res->nontrans_list,
 			    nontrans_list) {
-		ies2 = rcu_access_pointer(tmp_bss->pub.ies);
+		ies2 = rcu_access_pointer(tmp_bss->ies);
 		if (ies2->tsf < ies1->tsf)
 			cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
 							   mgmt, len, gfp);
@@ -1792,7 +1786,8 @@ EXPORT_SYMBOL(cfg80211_put_bss);
 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
-	struct cfg80211_internal_bss *bss, *nontrans_bss, *tmp;
+	struct cfg80211_internal_bss *bss, *tmp1;
+	struct cfg80211_bss *nontrans_bss, *tmp;
 
 	if (WARN_ON(!pub))
 		return;
@@ -1800,17 +1795,21 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 	bss = container_of(pub, struct cfg80211_internal_bss, pub);
 
 	spin_lock_bh(&rdev->bss_lock);
-	if (!list_empty(&bss->list)) {
-		list_for_each_entry_safe(nontrans_bss, tmp,
-					 &bss->nontrans_list,
-					 nontrans_list) {
-			if (__cfg80211_unlink_bss(rdev, nontrans_bss))
-				rdev->bss_generation++;
-		}
+	if (list_empty(&bss->list))
+		goto out;
 
-		if (__cfg80211_unlink_bss(rdev, bss))
+	list_for_each_entry_safe(nontrans_bss, tmp,
+				 &pub->nontrans_list,
+				 nontrans_list) {
+		tmp1 = container_of(nontrans_bss,
+				    struct cfg80211_internal_bss, pub);
+		if (__cfg80211_unlink_bss(rdev, tmp1))
 			rdev->bss_generation++;
 	}
+
+	if (__cfg80211_unlink_bss(rdev, bss))
+		rdev->bss_generation++;
+out:
 	spin_unlock_bh(&rdev->bss_lock);
 }
 EXPORT_SYMBOL(cfg80211_unlink_bss);
-- 
2.7.4

[PATCH v2 4/5] mac80211: Declare support for Multi-BSSID if driver supports it

[Jouni Malinen]

From: Sara Sharon <sara.sharon@intel.com>

Define bits and flags for indicating support of Multi-BSSID feature and
indicate support for this if the driver supports it.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 include/linux/ieee80211.h | 5 +++++
 include/net/mac80211.h    | 3 +++
 net/mac80211/debugfs.c    | 1 +
 net/mac80211/main.c       | 4 ++++
 4 files changed, 13 insertions(+)

v2:
- remove an extra empty line to silence checkpatch.pl --strict

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 407d6fd..bd23436 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2656,6 +2656,11 @@ enum ieee80211_tdls_actioncode {
  */
 #define WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING	BIT(2)
 
+/* Multiple BSSID capability is set in the 6th bit of the 3rd byte of the
+ * @WLAN_EID_EXT_CAPABILITY information element
+ */
+#define WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT	BIT(6)
+
 /* TDLS capabilities in the the 4th byte of @WLAN_EID_EXT_CAPABILITY */
 #define WLAN_EXT_CAPA4_TDLS_BUFFER_STA		BIT(4)
 #define WLAN_EXT_CAPA4_TDLS_PEER_PSM		BIT(5)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index aecbdf3..659c94f 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2181,6 +2181,8 @@ struct ieee80211_txq {
  *	MMPDUs on station interfaces. This of course requires the driver to use
  *	TXQs to start with.
  *
+ * @IEEE80211_HW_SUPPORTS_MULTI_BSSID: Hardware supports multi BSSID
+ *
  * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
  */
 enum ieee80211_hw_flags {
@@ -2229,6 +2231,7 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_BUFF_MMPDU_TXQ,
 	IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW,
 	IEEE80211_HW_STA_MMPDU_TXQ,
+	IEEE80211_HW_SUPPORTS_MULTI_BSSID,
 
 	/* keep last, obviously */
 	NUM_IEEE80211_HW_FLAGS
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 3fe541e..28a7e60 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -218,6 +218,7 @@ static const char *hw_flag_names[] = {
 	FLAG(BUFF_MMPDU_TXQ),
 	FLAG(SUPPORTS_VHT_EXT_NSS_BW),
 	FLAG(STA_MMPDU_TXQ),
+	FLAG(SUPPORTS_MULTI_BSSID),
 #undef FLAG
 };
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index ada8e16..2e3136b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1104,6 +1104,10 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 	if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))
 		local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;
 
+	/* mac80211 supports multi BSSID, if the driver supports it */
+	if (ieee80211_hw_check(&local->hw, SUPPORTS_MULTI_BSSID))
+		local->ext_capa[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
+
 	local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;
 
 	result = wiphy_register(local->hw.wiphy);
-- 
2.7.4

[PATCH v2 5/5] mac80211_hwsim: Declare support for Multi-BSSID

[Jouni Malinen]

This can be used to test cfg80211 support for Multi-BSSID scan result
parsing.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 drivers/net/wireless/mac80211_hwsim.c | 1 +
 1 file changed, 1 insertion(+)

v2:
- no changes

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index e4db8e2..74096d4 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2794,6 +2794,7 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 	ieee80211_hw_set(hw, TDLS_WIDER_BW);
 	if (rctbl)
 		ieee80211_hw_set(hw, SUPPORTS_RC_TABLE);
+	ieee80211_hw_set(hw, SUPPORTS_MULTI_BSSID);
 
 	hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
 			    WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL |
-- 
2.7.4

Re: [PATCH v2 1/5] cfg80211: Parsing of Multiple BSSID information in scanning

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 1572 bytes --]

Hi Peng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mac80211-next/master]
[also build test ERROR on v4.20-rc7 next-20181220]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jouni-Malinen/cfg80211-Parsing-of-Multiple-BSSID-information-in-scanning/20181221-123747
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git master
config: i386-randconfig-x0-12211724 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/wireless/scan.o: In function `cfg80211_gen_new_bssid':
>> net/wireless/scan.c:174: undefined reference to `__umoddi3'

vim +174 net/wireless/scan.c

   162	
   163	static void cfg80211_gen_new_bssid(const u8 *bssid, u8 max_bssid,
   164					   u8 mbssid_index, u8 *new_bssid_addr)
   165	{
   166		u64 bssid_tmp, new_bssid = 0;
   167		u64 lsb_n;
   168	
   169		bssid_tmp = ether_addr_to_u64(bssid);
   170	
   171		lsb_n = bssid_tmp & ((1 << max_bssid) - 1);
   172		new_bssid = bssid_tmp;
   173		new_bssid &= ~((1 << max_bssid) - 1);
 > 174		new_bssid |= (lsb_n + mbssid_index) % (1 << max_bssid);
   175	
   176		u64_to_ether_addr(new_bssid, new_bssid_addr);
   177	}
   178	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 36326 bytes --]

Re: [PATCH v2 1/5] cfg80211: Parsing of Multiple BSSID information in scanning

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 937 bytes --]

Hi Peng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mac80211-next/master]
[also build test ERROR on v4.20-rc7 next-20181221]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jouni-Malinen/cfg80211-Parsing-of-Multiple-BSSID-information-in-scanning/20181221-123747
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git master
config: i386-randconfig-a0-12230948 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "__umoddi3" [net/wireless/cfg80211.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 33143 bytes --]