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-rw-r--r--net/mac80211/mesh.c405
1 files changed, 337 insertions, 68 deletions
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 649ad513547f..29ce2aa87e7b 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -17,19 +17,14 @@
 #define TMR_RUNNING_MP	1
 #define TMR_RUNNING_MPR	2
 
-int mesh_allocated;
+static int mesh_allocated;
 static struct kmem_cache *rm_cache;
 
-#ifdef CONFIG_MAC80211_MESH
 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
 {
 	return (mgmt->u.action.u.mesh_action.action_code ==
 			WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
 }
-#else
-bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
-{ return false; }
-#endif
 
 void ieee80211s_init(void)
 {
@@ -41,6 +36,8 @@ void ieee80211s_init(void)
 
 void ieee80211s_stop(void)
 {
+	if (!mesh_allocated)
+		return;
 	mesh_pathtbl_unregister();
 	kmem_cache_destroy(rm_cache);
 }
@@ -95,24 +92,22 @@ bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
 	     (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
 	     (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
 	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
-		goto mismatch;
+		return false;
 
 	ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
 				&basic_rates);
 
 	if (sdata->vif.bss_conf.basic_rates != basic_rates)
-		goto mismatch;
+		return false;
 
 	ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
 				     ie->ht_operation, &sta_chan_def);
 
 	if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 					 &sta_chan_def))
-		goto mismatch;
+		return false;
 
 	return true;
-mismatch:
-	return false;
 }
 
 /**
@@ -123,7 +118,7 @@ mismatch:
 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 {
 	return (ie->mesh_config->meshconf_cap &
-	    IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
+			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 }
 
 /**
@@ -154,6 +149,31 @@ u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 	return changed;
 }
 
+/*
+ * mesh_sta_cleanup - clean up any mesh sta state
+ *
+ * @sta: mesh sta to clean up.
+ */
+void mesh_sta_cleanup(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	u32 changed;
+
+	/*
+	 * maybe userspace handles peer allocation and peering, but in either
+	 * case the beacon is still generated by the kernel and we might need
+	 * an update.
+	 */
+	changed = mesh_accept_plinks_update(sdata);
+	if (sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
+		changed |= mesh_plink_deactivate(sta);
+		del_timer_sync(&sta->plink_timer);
+	}
+
+	if (changed)
+		ieee80211_mbss_info_change_notify(sdata, changed);
+}
+
 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 {
 	int i;
@@ -176,11 +196,12 @@ void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 	if (!sdata->u.mesh.rmc)
 		return;
 
-	for (i = 0; i < RMC_BUCKETS; i++)
+	for (i = 0; i < RMC_BUCKETS; i++) {
 		list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 			list_del(&p->list);
 			kmem_cache_free(rm_cache, p);
 		}
+	}
 
 	kfree(rmc);
 	sdata->u.mesh.rmc = NULL;
@@ -189,6 +210,7 @@ void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 /**
  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
  *
+ * @sdata:	interface
  * @sa:		source address
  * @mesh_hdr:	mesh_header
  *
@@ -198,8 +220,8 @@ void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
  * received this frame lately. If the frame is not in the cache, it is added to
  * it.
  */
-int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
-		   struct ieee80211_sub_if_data *sdata)
+int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
+		   const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 {
 	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 	u32 seqnum = 0;
@@ -213,12 +235,11 @@ int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 	list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 		++entries;
 		if (time_after(jiffies, p->exp_time) ||
-				(entries == RMC_QUEUE_MAX_LEN)) {
+		    entries == RMC_QUEUE_MAX_LEN) {
 			list_del(&p->list);
 			kmem_cache_free(rm_cache, p);
 			--entries;
-		} else if ((seqnum == p->seqnum) &&
-			   (ether_addr_equal(sa, p->sa)))
+		} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 			return -1;
 	}
 
@@ -233,8 +254,8 @@ int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 	return 0;
 }
 
-int
-mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
+int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
+			 struct sk_buff *skb)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u8 *pos, neighbors;
@@ -265,16 +286,18 @@ mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 	/* Mesh capability */
 	*pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 	*pos |= ifmsh->accepting_plinks ?
-	    IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
+			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
+	/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
+	*pos |= ifmsh->ps_peers_deep_sleep ?
+			IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 	*pos++ |= ifmsh->adjusting_tbtt ?
-	    IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
+			IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 	*pos++ = 0x00;
 
 	return 0;
 }
 
-int
-mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
+int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u8 *pos;
@@ -291,8 +314,31 @@ mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 	return 0;
 }
 
-int
-mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
+static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
+				    struct sk_buff *skb)
+{
+	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	u8 *pos;
+
+	/* see IEEE802.11-2012 13.14.6 */
+	if (ifmsh->ps_peers_light_sleep == 0 &&
+	    ifmsh->ps_peers_deep_sleep == 0 &&
+	    ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
+		return 0;
+
+	if (skb_tailroom(skb) < 4)
+		return -ENOMEM;
+
+	pos = skb_put(skb, 2 + 2);
+	*pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
+	*pos++ = 2;
+	put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
+
+	return 0;
+}
+
+int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
+			struct sk_buff *skb)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u8 offset, len;
@@ -315,8 +361,7 @@ mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 	return 0;
 }
 
-int
-mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
+int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u8 len = 0;
@@ -344,11 +389,9 @@ mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 	return 0;
 }
 
-int mesh_add_ds_params_ie(struct sk_buff *skb,
-			  struct ieee80211_sub_if_data *sdata)
+static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
+				 struct sk_buff *skb)
 {
-	struct ieee80211_local *local = sdata->local;
-	struct ieee80211_supported_band *sband;
 	struct ieee80211_chanctx_conf *chanctx_conf;
 	struct ieee80211_channel *chan;
 	u8 *pos;
@@ -365,19 +408,16 @@ int mesh_add_ds_params_ie(struct sk_buff *skb,
 	chan = chanctx_conf->def.chan;
 	rcu_read_unlock();
 
-	sband = local->hw.wiphy->bands[chan->band];
-	if (sband->band == IEEE80211_BAND_2GHZ) {
-		pos = skb_put(skb, 2 + 1);
-		*pos++ = WLAN_EID_DS_PARAMS;
-		*pos++ = 1;
-		*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
-	}
+	pos = skb_put(skb, 2 + 1);
+	*pos++ = WLAN_EID_DS_PARAMS;
+	*pos++ = 1;
+	*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 
 	return 0;
 }
 
-int mesh_add_ht_cap_ie(struct sk_buff *skb,
-		       struct ieee80211_sub_if_data *sdata)
+int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
+		       struct sk_buff *skb)
 {
 	struct ieee80211_local *local = sdata->local;
 	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
@@ -398,8 +438,8 @@ int mesh_add_ht_cap_ie(struct sk_buff *skb,
 	return 0;
 }
 
-int mesh_add_ht_oper_ie(struct sk_buff *skb,
-			struct ieee80211_sub_if_data *sdata)
+int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
+			struct sk_buff *skb)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_chanctx_conf *chanctx_conf;
@@ -434,6 +474,7 @@ int mesh_add_ht_oper_ie(struct sk_buff *skb,
 
 	return 0;
 }
+
 static void ieee80211_mesh_path_timer(unsigned long data)
 {
 	struct ieee80211_sub_if_data *sdata =
@@ -479,7 +520,7 @@ void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 
 /**
  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
- * @hdr:    	802.11 frame header
+ * @hdr:	802.11 frame header
  * @fc:		frame control field
  * @meshda:	destination address in the mesh
  * @meshsa:	source address address in the mesh.  Same as TA, as frame is
@@ -510,8 +551,8 @@ int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 
 /**
  * ieee80211_new_mesh_header - create a new mesh header
- * @meshhdr:    uninitialized mesh header
  * @sdata:	mesh interface to be used
+ * @meshhdr:    uninitialized mesh header
  * @addr4or5:   1st address in the ae header, which may correspond to address 4
  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
  *              be NULL.
@@ -520,42 +561,49 @@ int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
  *
  * Return the header length.
  */
-int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
-		struct ieee80211_sub_if_data *sdata, char *addr4or5,
-		char *addr6)
+int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
+			      struct ieee80211s_hdr *meshhdr,
+			      const char *addr4or5, const char *addr6)
 {
-	int aelen = 0;
-	BUG_ON(!addr4or5 && addr6);
+	if (WARN_ON(!addr4or5 && addr6))
+		return 0;
+
 	memset(meshhdr, 0, sizeof(*meshhdr));
+
 	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
+
+	/* FIXME: racy -- TX on multiple queues can be concurrent */
 	put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 	sdata->u.mesh.mesh_seqnum++;
+
 	if (addr4or5 && !addr6) {
 		meshhdr->flags |= MESH_FLAGS_AE_A4;
-		aelen += ETH_ALEN;
 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
+		return 2 * ETH_ALEN;
 	} else if (addr4or5 && addr6) {
 		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
-		aelen += 2 * ETH_ALEN;
 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
+		return 3 * ETH_ALEN;
 	}
-	return 6 + aelen;
+
+	return ETH_ALEN;
 }
 
-static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
-			   struct ieee80211_if_mesh *ifmsh)
+static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 {
+	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u32 changed;
 
 	ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 	mesh_path_expire(sdata);
 
 	changed = mesh_accept_plinks_update(sdata);
-	ieee80211_bss_info_change_notify(sdata, changed);
+	ieee80211_mbss_info_change_notify(sdata, changed);
 
 	mod_timer(&ifmsh->housekeeping_timer,
-		  round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
+		  round_jiffies(jiffies +
+				IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 }
 
 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
@@ -603,10 +651,149 @@ void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 }
 #endif
 
-void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
+static int
+ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
+{
+	struct beacon_data *bcn;
+	int head_len, tail_len;
+	struct sk_buff *skb;
+	struct ieee80211_mgmt *mgmt;
+	struct ieee80211_chanctx_conf *chanctx_conf;
+	enum ieee80211_band band;
+	u8 *pos;
+	struct ieee80211_sub_if_data *sdata;
+	int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
+		      sizeof(mgmt->u.beacon);
+
+	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
+	rcu_read_lock();
+	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+	band = chanctx_conf->def.chan->band;
+	rcu_read_unlock();
+
+	head_len = hdr_len +
+		   2 + /* NULL SSID */
+		   2 + 8 + /* supported rates */
+		   2 + 3; /* DS params */
+	tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
+		   2 + sizeof(struct ieee80211_ht_cap) +
+		   2 + sizeof(struct ieee80211_ht_operation) +
+		   2 + ifmsh->mesh_id_len +
+		   2 + sizeof(struct ieee80211_meshconf_ie) +
+		   2 + sizeof(__le16) + /* awake window */
+		   ifmsh->ie_len;
+
+	bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
+	/* need an skb for IE builders to operate on */
+	skb = dev_alloc_skb(max(head_len, tail_len));
+
+	if (!bcn || !skb)
+		goto out_free;
+
+	/*
+	 * pointers go into the block we allocated,
+	 * memory is | beacon_data | head | tail |
+	 */
+	bcn->head = ((u8 *) bcn) + sizeof(*bcn);
+
+	/* fill in the head */
+	mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
+	memset(mgmt, 0, hdr_len);
+	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+					  IEEE80211_STYPE_BEACON);
+	eth_broadcast_addr(mgmt->da);
+	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
+	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
+	ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
+	mgmt->u.beacon.beacon_int =
+		cpu_to_le16(sdata->vif.bss_conf.beacon_int);
+	mgmt->u.beacon.capab_info |= cpu_to_le16(
+		sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
+
+	pos = skb_put(skb, 2);
+	*pos++ = WLAN_EID_SSID;
+	*pos++ = 0x0;
+
+	if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
+	    mesh_add_ds_params_ie(sdata, skb))
+		goto out_free;
+
+	bcn->head_len = skb->len;
+	memcpy(bcn->head, skb->data, bcn->head_len);
+
+	/* now the tail */
+	skb_trim(skb, 0);
+	bcn->tail = bcn->head + bcn->head_len;
+
+	if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
+	    mesh_add_rsn_ie(sdata, skb) ||
+	    mesh_add_ht_cap_ie(sdata, skb) ||
+	    mesh_add_ht_oper_ie(sdata, skb) ||
+	    mesh_add_meshid_ie(sdata, skb) ||
+	    mesh_add_meshconf_ie(sdata, skb) ||
+	    mesh_add_awake_window_ie(sdata, skb) ||
+	    mesh_add_vendor_ies(sdata, skb))
+		goto out_free;
+
+	bcn->tail_len = skb->len;
+	memcpy(bcn->tail, skb->data, bcn->tail_len);
+
+	dev_kfree_skb(skb);
+	rcu_assign_pointer(ifmsh->beacon, bcn);
+	return 0;
+out_free:
+	kfree(bcn);
+	dev_kfree_skb(skb);
+	return -ENOMEM;
+}
+
+static int
+ieee80211_mesh_rebuild_beacon(struct ieee80211_if_mesh *ifmsh)
+{
+	struct ieee80211_sub_if_data *sdata;
+	struct beacon_data *old_bcn;
+	int ret;
+	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
+
+	mutex_lock(&ifmsh->mtx);
+
+	old_bcn = rcu_dereference_protected(ifmsh->beacon,
+					    lockdep_is_held(&ifmsh->mtx));
+	ret = ieee80211_mesh_build_beacon(ifmsh);
+	if (ret)
+		/* just reuse old beacon */
+		goto out;
+
+	if (old_bcn)
+		kfree_rcu(old_bcn, rcu_head);
+out:
+	mutex_unlock(&ifmsh->mtx);
+	return ret;
+}
+
+void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
+				       u32 changed)
+{
+	if (sdata->vif.bss_conf.enable_beacon &&
+	    (changed & (BSS_CHANGED_BEACON |
+			BSS_CHANGED_HT |
+			BSS_CHANGED_BASIC_RATES |
+			BSS_CHANGED_BEACON_INT)))
+		if (ieee80211_mesh_rebuild_beacon(&sdata->u.mesh))
+			return;
+	ieee80211_bss_info_change_notify(sdata, changed);
+}
+
+int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	struct ieee80211_local *local = sdata->local;
+	u32 changed = BSS_CHANGED_BEACON |
+		      BSS_CHANGED_BEACON_ENABLED |
+		      BSS_CHANGED_HT |
+		      BSS_CHANGED_BASIC_RATES |
+		      BSS_CHANGED_BEACON_INT;
+	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 
 	local->fif_other_bss++;
 	/* mesh ifaces must set allmulti to forward mcast traffic */
@@ -624,34 +811,51 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 	ieee80211_queue_work(&local->hw, &sdata->work);
 	sdata->vif.bss_conf.ht_operation_mode =
 				ifmsh->mshcfg.ht_opmode;
-	sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
+	sdata->vif.bss_conf.enable_beacon = true;
 	sdata->vif.bss_conf.basic_rates =
-		ieee80211_mandatory_rates(sdata->local,
-					  ieee80211_get_sdata_band(sdata));
-	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
-						BSS_CHANGED_BEACON_ENABLED |
-						BSS_CHANGED_HT |
-						BSS_CHANGED_BASIC_RATES |
-						BSS_CHANGED_BEACON_INT);
+		ieee80211_mandatory_rates(local, band);
+
+	changed |= ieee80211_mps_local_status_update(sdata);
+
+	if (ieee80211_mesh_build_beacon(ifmsh)) {
+		ieee80211_stop_mesh(sdata);
+		return -ENOMEM;
+	}
+
+	ieee80211_bss_info_change_notify(sdata, changed);
 
 	netif_carrier_on(sdata->dev);
+	return 0;
 }
 
 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	struct beacon_data *bcn;
 
 	netif_carrier_off(sdata->dev);
 
 	/* stop the beacon */
 	ifmsh->mesh_id_len = 0;
+	sdata->vif.bss_conf.enable_beacon = false;
+	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
+	mutex_lock(&ifmsh->mtx);
+	bcn = rcu_dereference_protected(ifmsh->beacon,
+					lockdep_is_held(&ifmsh->mtx));
+	rcu_assign_pointer(ifmsh->beacon, NULL);
+	kfree_rcu(bcn, rcu_head);
+	mutex_unlock(&ifmsh->mtx);
 
 	/* flush STAs and mpaths on this iface */
-	sta_info_flush(sdata->local, sdata);
+	sta_info_flush(sdata);
 	mesh_path_flush_by_iface(sdata);
 
+	/* free all potentially still buffered group-addressed frames */
+	local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
+	skb_queue_purge(&ifmsh->ps.bc_buf);
+
 	del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 	del_timer_sync(&sdata->u.mesh.mesh_path_timer);
@@ -671,6 +875,62 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 	sdata->u.mesh.timers_running = 0;
 }
 
+static void
+ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
+			    struct ieee80211_mgmt *mgmt, size_t len)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	struct sk_buff *presp;
+	struct beacon_data *bcn;
+	struct ieee80211_mgmt *hdr;
+	struct ieee802_11_elems elems;
+	size_t baselen;
+	u8 *pos, *end;
+
+	end = ((u8 *) mgmt) + len;
+	pos = mgmt->u.probe_req.variable;
+	baselen = (u8 *) pos - (u8 *) mgmt;
+	if (baselen > len)
+		return;
+
+	ieee802_11_parse_elems(pos, len - baselen, &elems);
+
+	/* 802.11-2012 10.1.4.3.2 */
+	if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
+	     !is_broadcast_ether_addr(mgmt->da)) ||
+	    elems.ssid_len != 0)
+		return;
+
+	if (elems.mesh_id_len != 0 &&
+	    (elems.mesh_id_len != ifmsh->mesh_id_len ||
+	     memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
+		return;
+
+	rcu_read_lock();
+	bcn = rcu_dereference(ifmsh->beacon);
+
+	if (!bcn)
+		goto out;
+
+	presp = dev_alloc_skb(local->tx_headroom +
+			      bcn->head_len + bcn->tail_len);
+	if (!presp)
+		goto out;
+
+	skb_reserve(presp, local->tx_headroom);
+	memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
+	memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
+	hdr = (struct ieee80211_mgmt *) presp->data;
+	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+					 IEEE80211_STYPE_PROBE_RESP);
+	memcpy(hdr->da, mgmt->sa, ETH_ALEN);
+	IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+	ieee80211_tx_skb(sdata, presp);
+out:
+	rcu_read_unlock();
+}
+
 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 					u16 stype,
 					struct ieee80211_mgmt *mgmt,
@@ -760,6 +1020,9 @@ void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 					    rx_status);
 		break;
+	case IEEE80211_STYPE_PROBE_REQ:
+		ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
+		break;
 	case IEEE80211_STYPE_ACTION:
 		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 		break;
@@ -782,7 +1045,7 @@ void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 		mesh_mpp_table_grow();
 
 	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
-		ieee80211_mesh_housekeeping(sdata, ifmsh);
+		ieee80211_mesh_housekeeping(sdata);
 
 	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 		ieee80211_mesh_rootpath(sdata);
@@ -805,6 +1068,7 @@ void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	static u8 zero_addr[ETH_ALEN] = {};
 
 	setup_timer(&ifmsh->housekeeping_timer,
 		    ieee80211_mesh_housekeeping_timer,
@@ -828,6 +1092,11 @@ void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 		    ieee80211_mesh_path_root_timer,
 		    (unsigned long) sdata);
 	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
+	skb_queue_head_init(&ifmsh->ps.bc_buf);
 	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 	spin_lock_init(&ifmsh->sync_offset_lock);
+	RCU_INIT_POINTER(ifmsh->beacon, NULL);
+	mutex_init(&ifmsh->mtx);
+
+	sdata->vif.bss_conf.bssid = zero_addr;
 }
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-10-09 21:16:02 +0000