{nl,cfg,mac}80211: implement dot11MeshHWMPconfirmationInterval

As defined in section 13.10.9.3 Case D (802.11-2012), this
control variable is used to limit the mesh STA to send only
one PREQ to a root mesh STA within this interval of time
(in TUs). The default value for this variable is set to
2000 TUs. However, for current implementation, the maximum
configurable of dot11MeshHWMPconfirmationInterval is
restricted by dot11MeshHWMPactivePathTimeout.

Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
[line-break commit log]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 35e3acbe2262..bea52479e3aa 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -98,6 +98,8 @@ static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae)
 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
 #define disc_timeout_jiff(s) \
         msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
+#define root_path_confirmation_jiffies(s) \
+        msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
 
 enum mpath_frame_type {
         MPATH_PREQ = 0,
@@ -811,11 +813,14 @@ static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
         }
 
         if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
-             time_after(jiffies, mpath->exp_time - 1*HZ)) &&
+             (time_after(jiffies, mpath->last_preq_to_root +
+                                  root_path_confirmation_jiffies(sdata)) ||
+             time_before(jiffies, mpath->last_preq_to_root))) &&
              !(mpath->flags & MESH_PATH_FIXED)) {
                 mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name,
                                                                orig_addr);
                 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
+                mpath->last_preq_to_root = jiffies;
         }
 
         if ((SN_LT(mpath->sn, orig_sn) || (mpath->sn == orig_sn &&