mac80211: implement wds sta support (wds ap support work in progress, needs hostapd changes)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18356 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 329 insertions, 0 deletions

diff --git a/package/mac80211/patches/500-nl80211_4addr.patch b/package/mac80211/patches/500-nl80211_4addr.patch
new file mode 100644
index 0000000000..de3b78fdbb
--- /dev/null
+++ b/package/mac80211/patches/500-nl80211_4addr.patch
@@ -0,0 +1,69 @@
+--- a/include/linux/nl80211.h
++++ b/include/linux/nl80211.h
+@@ -584,6 +584,8 @@ enum nl80211_commands {
+  *	changed then the list changed and the dump should be repeated
+  *	completely from scratch.
+  *
++ * @NL80211_ATTR_4ADDR: Use 4-address frames on a virtual interface
++ *
+  * @NL80211_ATTR_MAX: highest attribute number currently defined
+  * @__NL80211_ATTR_AFTER_LAST: internal use
+  */
+@@ -714,6 +716,8 @@ enum nl80211_attrs {
+ 
+ 	NL80211_ATTR_PID,
+ 
++	NL80211_ATTR_4ADDR,
++
+ 	/* add attributes here, update the policy in nl80211.c */
+ 
+ 	__NL80211_ATTR_AFTER_LAST,
+--- a/include/net/cfg80211.h
++++ b/include/net/cfg80211.h
+@@ -207,10 +207,12 @@ struct ieee80211_supported_band {
+  * struct vif_params - describes virtual interface parameters
+  * @mesh_id: mesh ID to use
+  * @mesh_id_len: length of the mesh ID
++ * @use_4addr: use 4-address frames
+  */
+ struct vif_params {
+        u8 *mesh_id;
+        int mesh_id_len;
++       int use_4addr;
+ };
+ 
+ /**
+--- a/net/wireless/nl80211.c
++++ b/net/wireless/nl80211.c
+@@ -140,6 +140,7 @@ static struct nla_policy nl80211_policy[
+ 	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
+ 	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
+ 	[NL80211_ATTR_PID] = { .type = NLA_U32 },
++	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
+ };
+ 
+ /* policy for the attributes */
+@@ -989,6 +990,13 @@ static int nl80211_set_interface(struct 
+ 		change = true;
+ 	}
+ 
++	if (info->attrs[NL80211_ATTR_4ADDR]) {
++		params.use_4addr = !!nla_get_u8(info->attrs[NL80211_ATTR_4ADDR]);
++		change = true;
++	} else {
++		params.use_4addr = -1;
++	}
++
+ 	if (info->attrs[NL80211_ATTR_MNTR_FLAGS]) {
+ 		if (ntype != NL80211_IFTYPE_MONITOR) {
+ 			err = -EINVAL;
+@@ -1055,6 +1063,9 @@ static int nl80211_new_interface(struct 
+ 		params.mesh_id_len = nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
+ 	}
+ 
++	if (info->attrs[NL80211_ATTR_4ADDR])
++		params.use_4addr = !!nla_get_u8(info->attrs[NL80211_ATTR_4ADDR]);
++
+ 	err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
+ 				  info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
+ 				  &flags);
diff --git a/package/mac80211/patches/510-mac80211_4addr_vlan.patch b/package/mac80211/patches/510-mac80211_4addr_vlan.patch
new file mode 100644
index 0000000000..ac92fe54b1
--- /dev/null
+++ b/package/mac80211/patches/510-mac80211_4addr_vlan.patch
@@ -0,0 +1,260 @@
+--- a/net/mac80211/ieee80211_i.h
++++ b/net/mac80211/ieee80211_i.h
+@@ -208,6 +208,9 @@ struct ieee80211_if_wds {
+ 
+ struct ieee80211_if_vlan {
+ 	struct list_head list;
++
++	/* used for all tx if the VLAN is configured to 4-addr mode */
++	struct sta_info *sta;
+ };
+ 
+ struct mesh_stats {
+@@ -457,6 +460,8 @@ struct ieee80211_sub_if_data {
+ 	int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
+ 	int max_ratectrl_rateidx; /* max TX rateidx for rate control */
+ 
++	bool use_4addr; /* use 4-address frames */
++
+ 	union {
+ 		struct ieee80211_if_ap ap;
+ 		struct ieee80211_if_wds wds;
+--- a/net/mac80211/cfg.c
++++ b/net/mac80211/cfg.c
+@@ -36,6 +36,24 @@ static bool nl80211_type_check(enum nl80
+ 	}
+ }
+ 
++static bool nl80211_params_check(enum nl80211_iftype type,
++				 struct vif_params *params)
++{
++	if (!nl80211_type_check(type))
++		return false;
++
++	if (params->use_4addr > 0) {
++		switch(type) {
++		case NL80211_IFTYPE_AP_VLAN:
++		case NL80211_IFTYPE_STATION:
++			break;
++		default:
++			return false;
++		}
++	}
++	return true;
++}
++
+ static int ieee80211_add_iface(struct wiphy *wiphy, char *name,
+ 			       enum nl80211_iftype type, u32 *flags,
+ 			       struct vif_params *params)
+@@ -45,7 +63,7 @@ static int ieee80211_add_iface(struct wi
+ 	struct ieee80211_sub_if_data *sdata;
+ 	int err;
+ 
+-	if (!nl80211_type_check(type))
++	if (!nl80211_params_check(type, params))
+ 		return -EINVAL;
+ 
+ 	err = ieee80211_if_add(local, name, &dev, type, params);
+@@ -75,7 +93,7 @@ static int ieee80211_change_iface(struct
+ 	if (netif_running(dev))
+ 		return -EBUSY;
+ 
+-	if (!nl80211_type_check(type))
++	if (!nl80211_params_check(type, params))
+ 		return -EINVAL;
+ 
+ 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+@@ -89,6 +107,9 @@ static int ieee80211_change_iface(struct
+ 					    params->mesh_id_len,
+ 					    params->mesh_id);
+ 
++	if (params->use_4addr >= 0)
++		sdata->use_4addr = !!params->use_4addr;
++
+ 	if (sdata->vif.type != NL80211_IFTYPE_MONITOR || !flags)
+ 		return 0;
+ 
+@@ -806,6 +827,13 @@ static int ieee80211_change_station(stru
+ 			return -EINVAL;
+ 		}
+ 
++		if (vlansdata->use_4addr) {
++			if (vlansdata->u.vlan.sta)
++				return -EBUSY;
++
++			rcu_assign_pointer(vlansdata->u.vlan.sta, sta);
++		}
++
+ 		sta->sdata = vlansdata;
+ 		ieee80211_send_layer2_update(sta);
+ 	}
+--- a/net/mac80211/sta_info.c
++++ b/net/mac80211/sta_info.c
+@@ -489,6 +489,9 @@ static void __sta_info_unlink(struct sta
+ 	local->num_sta--;
+ 	local->sta_generation++;
+ 
++	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
++		rcu_assign_pointer(sdata->u.vlan.sta, NULL);
++
+ 	if (local->ops->sta_notify) {
+ 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ 			sdata = container_of(sdata->bss,
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -1046,7 +1046,10 @@ ieee80211_tx_prepare(struct ieee80211_su
+ 
+ 	hdr = (struct ieee80211_hdr *) skb->data;
+ 
+-	tx->sta = sta_info_get(local, hdr->addr1);
++	if ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && sdata->use_4addr)
++		tx->sta = rcu_dereference(sdata->u.vlan.sta);
++	if (!tx->sta)
++		tx->sta = sta_info_get(local, hdr->addr1);
+ 
+ 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
+ 	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
+@@ -1608,7 +1611,7 @@ netdev_tx_t ieee80211_subif_start_xmit(s
+ 	const u8 *encaps_data;
+ 	int encaps_len, skip_header_bytes;
+ 	int nh_pos, h_pos;
+-	struct sta_info *sta;
++	struct sta_info *sta = NULL;
+ 	u32 sta_flags = 0;
+ 
+ 	if (unlikely(skb->len < ETH_HLEN)) {
+@@ -1625,8 +1628,25 @@ netdev_tx_t ieee80211_subif_start_xmit(s
+ 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
+ 
+ 	switch (sdata->vif.type) {
+-	case NL80211_IFTYPE_AP:
+ 	case NL80211_IFTYPE_AP_VLAN:
++		rcu_read_lock();
++		if (sdata->use_4addr)
++			sta = rcu_dereference(sdata->u.vlan.sta);
++		if (sta) {
++			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
++			/* RA TA DA SA */
++			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
++			memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
++			memcpy(hdr.addr3, skb->data, ETH_ALEN);
++			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
++			hdrlen = 30;
++			sta_flags = get_sta_flags(sta);
++		}
++		rcu_read_unlock();
++		if (sta)
++			break;
++		/* fall through */
++	case NL80211_IFTYPE_AP:
+ 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
+ 		/* DA BSSID SA */
+ 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
+@@ -1700,12 +1720,21 @@ netdev_tx_t ieee80211_subif_start_xmit(s
+ 		break;
+ #endif
+ 	case NL80211_IFTYPE_STATION:
+-		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
+-		/* BSSID SA DA */
+ 		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
+-		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
+-		memcpy(hdr.addr3, skb->data, ETH_ALEN);
+-		hdrlen = 24;
++		if (sdata->use_4addr && ethertype != ETH_P_PAE) {
++			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
++			/* RA TA DA SA */
++			memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
++			memcpy(hdr.addr3, skb->data, ETH_ALEN);
++			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
++			hdrlen = 30;
++		} else {
++			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
++			/* BSSID SA DA */
++			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
++			memcpy(hdr.addr3, skb->data, ETH_ALEN);
++			hdrlen = 24;
++		}
+ 		break;
+ 	case NL80211_IFTYPE_ADHOC:
+ 		/* DA SA BSSID */
+--- a/net/mac80211/iface.c
++++ b/net/mac80211/iface.c
+@@ -772,6 +772,7 @@ int ieee80211_if_change_type(struct ieee
+ 		ieee80211_mandatory_rates(sdata->local,
+ 			sdata->local->hw.conf.channel->band);
+ 	sdata->drop_unencrypted = 0;
++	sdata->use_4addr = 0;
+ 
+ 	return 0;
+ }
+@@ -853,6 +854,9 @@ int ieee80211_if_add(struct ieee80211_lo
+ 					    params->mesh_id_len,
+ 					    params->mesh_id);
+ 
++	if (params && params->use_4addr >= 0)
++		sdata->use_4addr = !!params->use_4addr;
++
+ 	mutex_lock(&local->iflist_mtx);
+ 	list_add_tail_rcu(&sdata->list, &local->interfaces);
+ 	mutex_unlock(&local->iflist_mtx);
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -1237,6 +1237,13 @@ __ieee80211_data_to_8023(struct ieee8021
+ {
+ 	struct net_device *dev = rx->dev;
+ 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
++	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
++
++	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->use_4addr &&
++	    ieee80211_has_a4(hdr->frame_control))
++		return -1;
++	if (sdata->use_4addr && is_multicast_ether_addr(hdr->addr1))
++		return -1;
+ 
+ 	return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
+ }
+@@ -1590,6 +1597,7 @@ ieee80211_rx_h_data(struct ieee80211_rx_
+ {
+ 	struct net_device *dev = rx->dev;
+ 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
++	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ 	__le16 fc = hdr->frame_control;
+ 	int err;
+ 
+@@ -1599,6 +1607,14 @@ ieee80211_rx_h_data(struct ieee80211_rx_
+ 	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+ 		return RX_DROP_MONITOR;
+ 
++	/*
++	 * Allow the cooked monitor interface of an AP to see 4-addr frames so
++	 * that a 4-addr station can be detected and moved into a separate VLAN
++	 */
++	if (ieee80211_has_a4(hdr->frame_control) &&
++	    sdata->vif.type == NL80211_IFTYPE_AP)
++		return RX_DROP_MONITOR;
++
+ 	err = __ieee80211_data_to_8023(rx);
+ 	if (unlikely(err))
+ 		return RX_DROP_UNUSABLE;
+@@ -2039,7 +2055,7 @@ static int prepare_for_handlers(struct i
+ 
+ 	switch (sdata->vif.type) {
+ 	case NL80211_IFTYPE_STATION:
+-		if (!bssid)
++		if (!bssid && !sdata->use_4addr)
+ 			return 0;
+ 		if (!multicast &&
+ 		    compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
+--- a/net/wireless/util.c
++++ b/net/wireless/util.c
+@@ -320,7 +320,9 @@ int ieee80211_data_to_8023(struct sk_buf
+ 		break;
+ 	case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
+ 		if (unlikely(iftype != NL80211_IFTYPE_WDS &&
+-			     iftype != NL80211_IFTYPE_MESH_POINT))
++			     iftype != NL80211_IFTYPE_MESH_POINT &&
++			     iftype != NL80211_IFTYPE_AP_VLAN &&
++			     iftype != NL80211_IFTYPE_STATION))
+ 			return -1;
+ 		if (iftype == NL80211_IFTYPE_MESH_POINT) {
+ 			struct ieee80211s_hdr *meshdr =