{nl,cfg}80211: make peer link expiration time configurable

If a STA has a peer that it hasn't seen any tx activity
from for a certain length of time, the peer link is
expired. This means the inactive STA is removed from the
list of peers and that STA is not considered a peer again
unless it re-peers.  Previously, this inactivity time was
always 30 minutes.  Now, add it to the mesh configuration
and allow it to be configured.  Retain 30 minutes as a
default value.

Signed-off-by: Colleen Twitty <colleen@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 18 insertions, 1 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 855c76ccff38..31ca11672ca8 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1124,6 +1124,9 @@ struct bss_parameters {
  *      setting for new peer links.
  * @dot11MeshAwakeWindowDuration: The duration in TUs the STA will remain awake
  *      after transmitting its beacon.
+ * @plink_timeout: If no tx activity is seen from a STA we've established
+ *      peering with for longer than this time (in seconds), then remove it
+ *      from the STA's list of peers.  Default is 30 minutes.
  */
 struct mesh_config {
         u16 dot11MeshRetryTimeout;
@@ -1153,6 +1156,7 @@ struct mesh_config {
         u16 dot11MeshHWMPconfirmationInterval;
         enum nl80211_mesh_power_mode power_mode;
         u16 dot11MeshAwakeWindowDuration;
+        u32 plink_timeout;
 };
 
 /**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 1f0019d4cce6..ca6facf4df0c 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2577,6 +2577,10 @@ enum nl80211_mesh_power_mode {
  *
  * @NL80211_MESHCONF_AWAKE_WINDOW: awake window duration (in TUs)
  *
+ * @NL80211_MESHCONF_PLINK_TIMEOUT: If no tx activity is seen from a STA we've
+ *      established peering with for longer than this time (in seconds), then
+ *      remove it from the STA's list of peers.  Default is 30 minutes.
+ *
  * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
  */
 enum nl80211_meshconf_params {
@@ -2608,6 +2612,7 @@ enum nl80211_meshconf_params {
         NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
         NL80211_MESHCONF_POWER_MODE,
         NL80211_MESHCONF_AWAKE_WINDOW,
+        NL80211_MESHCONF_PLINK_TIMEOUT,
 
         /* keep last */
         __NL80211_MESHCONF_ATTR_AFTER_LAST,
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 5dfb289ab761..0daaf72e1b81 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -18,6 +18,7 @@
 #define MESH_PATH_TO_ROOT_TIMEOUT      6000
 #define MESH_ROOT_INTERVAL     5000
 #define MESH_ROOT_CONFIRMATION_INTERVAL 2000
+#define MESH_DEFAULT_PLINK_TIMEOUT      1800 /* timeout in seconds */
 
 /*
  * Minimum interval between two consecutive PREQs originated by the same
@@ -75,6 +76,7 @@ const struct mesh_config default_mesh_config = {
         .dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
         .power_mode = NL80211_MESH_POWER_ACTIVE,
         .dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
+        .plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
 };
 
 const struct mesh_setup default_mesh_setup = {
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 88e820b73674..8aa83c04d4eb 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4575,7 +4575,9 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
             nla_put_u32(msg, NL80211_MESHCONF_POWER_MODE,
                         cur_params.power_mode) ||
             nla_put_u16(msg, NL80211_MESHCONF_AWAKE_WINDOW,
-                        cur_params.dot11MeshAwakeWindowDuration))
+                        cur_params.dot11MeshAwakeWindowDuration) ||
+            nla_put_u32(msg, NL80211_MESHCONF_PLINK_TIMEOUT,
+                        cur_params.plink_timeout))
                 goto nla_put_failure;
         nla_nest_end(msg, pinfoattr);
         genlmsg_end(msg, hdr);
@@ -4616,6 +4618,7 @@ static const struct nla_policy nl80211_meshconf_params_policy[NL80211_MESHCONF_A
         [NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL] = { .type = NLA_U16 },
         [NL80211_MESHCONF_POWER_MODE] = { .type = NLA_U32 },
         [NL80211_MESHCONF_AWAKE_WINDOW] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_PLINK_TIMEOUT] = { .type = NLA_U32 },
 };
 
 static const struct nla_policy
@@ -4753,6 +4756,9 @@ do {									    \
         FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshAwakeWindowDuration,
                                   0, 65535, mask,
                                   NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, 1, 0xffffffff,
+                                  mask, NL80211_MESHCONF_PLINK_TIMEOUT,
+                                  nla_get_u32);
         if (mask_out)
                 *mask_out = mask;