mac80211: Let userspace enable and configure vendor specific path selection.

Userspace will now be allowed to toggle between the default path
selection algorithm (HWMP, implemented in the kernel), and a vendor
specific alternative.  Also in the same patch, allow userspace to add
information elements to mesh beacons.  This is accordance with the
Extensible Path Selection Framework specified in version 7.0 of the
802.11s draft.

Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 48 insertions, 8 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 1c94a2a..ae2c712 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1000,6 +1000,36 @@ static inline bool _chg_mesh_attr(enum nl80211_meshconf_params parm, u32 mask)
 	return (mask >> (parm-1)) & 0x1;
 }
 
+static int copy_mesh_setup(struct ieee80211_if_mesh *ifmsh,
+		const struct mesh_setup *setup)
+{
+	u8 *new_ie;
+	const u8 *old_ie;
+
+	/* first allocate the new vendor information element */
+	new_ie = NULL;
+	old_ie = ifmsh->vendor_ie;
+
+	ifmsh->vendor_ie_len = setup->vendor_ie_len;
+	if (setup->vendor_ie_len) {
+		new_ie = kmemdup(setup->vendor_ie, setup->vendor_ie_len,
+				GFP_KERNEL);
+		if (!new_ie)
+			return -ENOMEM;
+	}
+
+	/* now copy the rest of the setup parameters */
+	ifmsh->mesh_id_len = setup->mesh_id_len;
+	memcpy(ifmsh->mesh_id, setup->mesh_id, ifmsh->mesh_id_len);
+	ifmsh->mesh_pp_id = setup->path_sel_proto;
+	ifmsh->mesh_pm_id = setup->path_metric;
+	ifmsh->vendor_ie = new_ie;
+
+	kfree(old_ie);
+
+	return 0;
+}
+
 static int ieee80211_update_mesh_config(struct wiphy *wiphy,
 					struct net_device *dev, u32 mask,
 					const struct mesh_config *nconf)
@@ -1059,11 +1089,12 @@ static int ieee80211_join_mesh(struct wiphy *wiphy, struct net_device *dev,
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	int err;
 
-	memcpy(&sdata->u.mesh.mshcfg, conf, sizeof(struct mesh_config));
-	ifmsh->mesh_id_len = setup->mesh_id_len;
-	memcpy(ifmsh->mesh_id, setup->mesh_id, ifmsh->mesh_id_len);
-
+	memcpy(&ifmsh->mshcfg, conf, sizeof(struct mesh_config));
+	err = copy_mesh_setup(ifmsh, setup);
+	if (err)
+		return err;
 	ieee80211_start_mesh(sdata);
 
 	return 0;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index ce58b2a..eadaa24 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -484,6 +484,8 @@ struct ieee80211_if_mesh {
 	struct mesh_config mshcfg;
 	u32 mesh_seqnum;
 	bool accepting_plinks;
+	const u8 *vendor_ie;
+	u8 vendor_ie_len;
 };
 
 #ifdef CONFIG_MAC80211_MESH
@@ -585,9 +587,7 @@ struct ieee80211_sub_if_data {
 		struct ieee80211_if_vlan vlan;
 		struct ieee80211_if_managed mgd;
 		struct ieee80211_if_ibss ibss;
-#ifdef CONFIG_MAC80211_MESH
 		struct ieee80211_if_mesh mesh;
-#endif
 		u32 mntr_flags;
 	} u;
 
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 63e1188..c326e00 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -287,6 +287,13 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 	*pos++ |= sdata->u.mesh.accepting_plinks ?
 	    MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 	*pos++ = 0x00;
+
+	if (sdata->u.mesh.vendor_ie) {
+		int len = sdata->u.mesh.vendor_ie_len;
+		const u8 *data = sdata->u.mesh.vendor_ie;
+		if (skb_tailroom(skb) > len)
+			memcpy(skb_put(skb, len), data, len);
+	}
 }
 
 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 1c91f0f..44b5393 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -160,7 +160,8 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 		enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 		__le16 reason) {
 	struct ieee80211_local *local = sdata->local;
-	struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
+	struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
+			sdata->u.mesh.vendor_ie_len);
 	struct ieee80211_mgmt *mgmt;
 	bool include_plid = false;
 	static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 157bde9..f4b1b62 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2290,7 +2290,8 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
 		u8 *pos;
 
 		/* headroom, head length, tail length and maximum TIM length */
-		skb = dev_alloc_skb(local->tx_headroom + 400);
+		skb = dev_alloc_skb(local->tx_headroom + 400 +
+				sdata->u.mesh.vendor_ie_len);
 		if (!skb)
 			goto out;