{nl,cfg,mac}80211: Add support of setting non-forwarding entity in Mesh

A mesh node that joins the mesh network is by default a forwarding entity. This patch allows
the mesh node to set as non-forwarding entity. Whenever dot11MeshForwarding is set to 0, the
mesh node can prevent itself from forwarding the traffic which is not destined to him.

Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

7 files changed, 15 insertions, 1 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 0f5ff3739820..4f98fae13307 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -2104,6 +2104,9 @@ enum nl80211_mntr_flags {
  * TUs) during which a mesh STA can send only one Action frame containing a
  * PERR element.
  *
+ * @NL80211_MESHCONF_FORWARDING: set Mesh STA as forwarding or non-forwarding
+ * or forwarding entity (default is TRUE - forwarding entity)
+ *
  * @NL80211_MESHCONF_ATTR_MAX: highest possible mesh configuration attribute
  *
  * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
@@ -2128,6 +2131,7 @@ enum nl80211_meshconf_params {
         NL80211_MESHCONF_HWMP_RANN_INTERVAL,
         NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
         NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
+        NL80211_MESHCONF_FORWARDING,
 
         /* keep last */
         __NL80211_MESHCONF_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 208a7b5f8d49..281899167d2d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -798,6 +798,7 @@ struct mesh_config {
          * mesh gate, but not necessarily using the gate announcement protocol.
          * Still keeping the same nomenclature to be in sync with the spec. */
         bool  dot11MeshGateAnnouncementProtocol;
+        bool dot11MeshForwarding;
 };
 
 /**
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 74c9301681e5..98460783c2d3 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1346,6 +1346,8 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy,
                 conf->dot11MeshHWMPRannInterval =
                         nconf->dot11MeshHWMPRannInterval;
         }
+        if (_chg_mesh_attr(NL80211_MESHCONF_FORWARDING, mask))
+                conf->dot11MeshForwarding = nconf->dot11MeshForwarding;
         return 0;
 }
 
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 176c08ffb13c..81d12e65a23c 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -422,6 +422,7 @@ IEEE80211_IF_FILE(dot11MeshGateAnnouncementProtocol,
                 u.mesh.mshcfg.dot11MeshGateAnnouncementProtocol, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPRannInterval,
                 u.mesh.mshcfg.dot11MeshHWMPRannInterval, DEC);
+IEEE80211_IF_FILE(dot11MeshForwarding, u.mesh.mshcfg.dot11MeshForwarding, DEC);
 #endif
 
 
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 73abb7524b2c..cae407136ae0 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -575,7 +575,7 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
                         ifmsh->mshstats.dropped_frames_ttl++;
         }
 
-        if (forward) {
+        if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
                 u32 preq_id;
                 u8 hopcount, flags;
 
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 8c550df13037..9d3e3b6bfcf4 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -55,6 +55,7 @@ const struct mesh_config default_mesh_config = {
         .min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
         .dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
         .dot11MeshGateAnnouncementProtocol = false,
+        .dot11MeshForwarding = true,
 };
 
 const struct mesh_setup default_mesh_setup = {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5cefd74ab47d..c42173f947ef 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3258,6 +3258,8 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
                         cur_params.dot11MeshHWMPRannInterval);
         NLA_PUT_U8(msg, NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
                         cur_params.dot11MeshGateAnnouncementProtocol);
+        NLA_PUT_U8(msg, NL80211_MESHCONF_FORWARDING,
+                        cur_params.dot11MeshForwarding);
         nla_nest_end(msg, pinfoattr);
         genlmsg_end(msg, hdr);
         return genlmsg_reply(msg, info);
@@ -3289,6 +3291,7 @@ static const struct nla_policy nl80211_meshconf_params_policy[NL80211_MESHCONF_A
         [NL80211_MESHCONF_HWMP_ROOTMODE] = { .type = NLA_U8 },
         [NL80211_MESHCONF_HWMP_RANN_INTERVAL] = { .type = NLA_U16 },
         [NL80211_MESHCONF_GATE_ANNOUNCEMENTS] = { .type = NLA_U8 },
+        [NL80211_MESHCONF_FORWARDING] = { .type = NLA_U8 },
 };
 
 static const struct nla_policy
@@ -3378,6 +3381,8 @@ do {\
                         dot11MeshGateAnnouncementProtocol, mask,
                         NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
                         nla_get_u8);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshForwarding,
+                        mask, NL80211_MESHCONF_FORWARDING, nla_get_u8);
         if (mask_out)
                 *mask_out = mask;