[PATCH 8/8] {nl,cfg,mac}80211: let userspace make meshif mesh gate

[Thomas Pedersen <thomas@cozybit.com>]

From: Javier Cardona <javier@cozybit.com>

Allow userspace to set NL80211_MESHCONF_GATE_ANNOUNCEMENTS attribute,
which will advertise this mesh node as being a mesh gate.
dot11MeshHWMPRootMode must be set as root announcements are used to
indicate we're a mesh gate. Set this if user forgot for now.

Signed-off-by: Javier Cardona <javier@cozybit.com>

---

v2: - make mesh gate a root node

 include/linux/nl80211.h       |    5 +++++
 include/net/cfg80211.h        |    5 +++++
 net/mac80211/cfg.c            |   12 ++++++++++++
 net/mac80211/debugfs_netdev.c |    3 +++
 net/mac80211/mesh_hwmp.c      |    5 ++++-
 net/wireless/mesh.c           |    1 +
 net/wireless/nl80211.c        |    7 +++++++
 7 files changed, 37 insertions(+), 1 deletions(-)

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 20353bb..3769303 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -1864,6 +1864,10 @@ enum nl80211_mntr_flags {
  * @NL80211_MESHCONF_HWMP_RANN_INTERVAL:  The interval of time (in TUs) between
  * root announcements are transmitted.
  *
+ * @NL80211_MESHCONF_GATE_ANNOUNCEMENTS: Advertise that this mesh station has
+ * access to a broader network beyond the MBSS.  This is done via Root
+ * Announcement frames.
+ *
  * @NL80211_MESHCONF_ATTR_MAX: highest possible mesh configuration attribute
  *
  * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
@@ -1886,6 +1890,7 @@ enum nl80211_meshconf_params {
 	NL80211_MESHCONF_HWMP_ROOTMODE,
 	NL80211_MESHCONF_ELEMENT_TTL,
 	NL80211_MESHCONF_HWMP_RANN_INTERVAL,
+	NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
 
 	/* keep last */
 	__NL80211_MESHCONF_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 2d88f06..a37f264 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -756,6 +756,11 @@ struct mesh_config {
 	u16 dot11MeshHWMPnetDiameterTraversalTime;
 	u8  dot11MeshHWMPRootMode;
 	u16 dot11MeshHWMPRannInterval;
+	/* This is missnamed in draft 12.0: dot11MeshGateAnnouncementProtocol
+	 * set to true only means that the station will announce others it's a
+	 * mesh gate, but not necessarily using the gate announcement protocol.
+	 * Still keeping the same nomenclature to be in sync with the spec. */
+	bool  dot11MeshGateAnnouncementProtocol;
 };
 
 /**
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 9995c83..6ab67ab 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1137,6 +1137,18 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy,
 		conf->dot11MeshHWMPRootMode = nconf->dot11MeshHWMPRootMode;
 		ieee80211_mesh_root_setup(ifmsh);
 	}
+	if (_chg_mesh_attr(NL80211_MESHCONF_GATE_ANNOUNCEMENTS, mask)) {
+		/* our current gate announcement implementation rides on root
+		 * announcements, so require this ifmsh to also be a root node
+		 * */
+		if (nconf->dot11MeshGateAnnouncementProtocol &&
+		    !conf->dot11MeshHWMPRootMode) {
+			conf->dot11MeshHWMPRootMode = 1;
+			ieee80211_mesh_root_setup(ifmsh);
+		}
+		conf->dot11MeshGateAnnouncementProtocol =
+			nconf->dot11MeshGateAnnouncementProtocol;
+	}
 	if (_chg_mesh_attr(NL80211_MESHCONF_HWMP_RANN_INTERVAL, mask)) {
 		conf->dot11MeshHWMPRannInterval =
 			nconf->dot11MeshHWMPRannInterval;
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index bac9443..6e8eab7 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -372,6 +372,8 @@ IEEE80211_IF_FILE(min_discovery_timeout,
 		u.mesh.mshcfg.min_discovery_timeout, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPRootMode,
 		u.mesh.mshcfg.dot11MeshHWMPRootMode, DEC);
+IEEE80211_IF_FILE(dot11MeshGateAnnouncementProtocol,
+		u.mesh.mshcfg.dot11MeshGateAnnouncementProtocol, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPRannInterval,
 		u.mesh.mshcfg.dot11MeshHWMPRannInterval, DEC);
 #endif
@@ -489,6 +491,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
 	MESHPARAMS_ADD(min_discovery_timeout);
 	MESHPARAMS_ADD(dot11MeshHWMPRootMode);
 	MESHPARAMS_ADD(dot11MeshHWMPRannInterval);
+	MESHPARAMS_ADD(dot11MeshGateAnnouncementProtocol);
 #undef MESHPARAMS_ADD
 }
 #endif
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index ae3de75..fd4f76a 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -1045,8 +1045,11 @@ mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
+	u8 flags;
 
-	mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->vif.addr,
+	flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
+			? RANN_FLAG_IS_GATE : 0;
+	mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
 			       cpu_to_le32(++ifmsh->sn),
 			       0, NULL, 0, broadcast_addr,
 			       0, sdata->u.mesh.mshcfg.element_ttl,
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index b5a39d4..4423e64 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -51,6 +51,7 @@ const struct mesh_config default_mesh_config = {
 	.path_refresh_time = MESH_PATH_REFRESH_TIME,
 	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
 	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
+	.dot11MeshGateAnnouncementProtocol = false,
 };
 
 const struct mesh_setup default_mesh_setup = {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bbf3d73..57ecfa4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3037,6 +3037,8 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
 			cur_params.dot11MeshHWMPRootMode);
 	NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_RANN_INTERVAL,
 			cur_params.dot11MeshHWMPRannInterval);
+	NLA_PUT_U8(msg, NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
+			cur_params.dot11MeshGateAnnouncementProtocol);
 	nla_nest_end(msg, pinfoattr);
 	genlmsg_end(msg, hdr);
 	return genlmsg_reply(msg, info);
@@ -3066,6 +3068,7 @@ static const struct nla_policy nl80211_meshconf_params_policy[NL80211_MESHCONF_A
 	[NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME] = { .type = NLA_U16 },
 	[NL80211_MESHCONF_HWMP_ROOTMODE] = { .type = NLA_U8 },
 	[NL80211_MESHCONF_HWMP_RANN_INTERVAL] = { .type = NLA_U16 },
+	[NL80211_MESHCONF_GATE_ANNOUNCEMENTS] = { .type = NLA_U8 },
 };
 
 static const struct nla_policy
@@ -3148,6 +3151,10 @@ do {\
 			dot11MeshHWMPRannInterval, mask,
 			NL80211_MESHCONF_HWMP_RANN_INTERVAL,
 			nla_get_u16);
+	FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
+			dot11MeshGateAnnouncementProtocol, mask,
+			NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
+			nla_get_u8);
 	if (mask_out)
 		*mask_out = mask;
 
-- 
1.7.4.1