{nl,cfg,mac}80211: implement dot11MeshHWMPperrMinInterval

As per 802.11mb 13.9.11.3

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

9 files changed, 30 insertions, 1 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 1fc04853ec95..f51e3bf93a96 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -2094,6 +2094,10 @@ enum nl80211_mntr_flags {
  * access to a broader network beyond the MBSS.  This is done via Root
  * Announcement frames.
  *
+ * @NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL: The minimum interval of time (in
+ * TUs) during which a mesh STA can send only one Action frame containing a
+ * PERR element.
+ *
  * @NL80211_MESHCONF_ATTR_MAX: highest possible mesh configuration attribute
  *
  * @__NL80211_MESHCONF_ATTR_AFTER_LAST: internal use
@@ -2117,6 +2121,7 @@ enum nl80211_meshconf_params {
         NL80211_MESHCONF_ELEMENT_TTL,
         NL80211_MESHCONF_HWMP_RANN_INTERVAL,
         NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
+        NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
 
         /* keep last */
         __NL80211_MESHCONF_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 232d1a5c5672..ce6236b5473d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -782,6 +782,7 @@ struct mesh_config {
         u16 min_discovery_timeout;
         u32 dot11MeshHWMPactivePathTimeout;
         u16 dot11MeshHWMPpreqMinInterval;
+        u16 dot11MeshHWMPperrMinInterval;
         u16 dot11MeshHWMPnetDiameterTraversalTime;
         u8  dot11MeshHWMPRootMode;
         u16 dot11MeshHWMPRannInterval;
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 7ccba83dc8c8..393b2a4445b8 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1272,6 +1272,9 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy,
         if (_chg_mesh_attr(NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL, mask))
                 conf->dot11MeshHWMPpreqMinInterval =
                         nconf->dot11MeshHWMPpreqMinInterval;
+        if (_chg_mesh_attr(NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL, mask))
+                conf->dot11MeshHWMPperrMinInterval =
+                        nconf->dot11MeshHWMPperrMinInterval;
         if (_chg_mesh_attr(NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
                            mask))
                 conf->dot11MeshHWMPnetDiameterTraversalTime =
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 9352819a986b..8df28910b8ee 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -405,6 +405,8 @@ IEEE80211_IF_FILE(dot11MeshHWMPactivePathTimeout,
                 u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPpreqMinInterval,
                 u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval, DEC);
+IEEE80211_IF_FILE(dot11MeshHWMPperrMinInterval,
+                u.mesh.mshcfg.dot11MeshHWMPperrMinInterval, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPnetDiameterTraversalTime,
                 u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime, DEC);
 IEEE80211_IF_FILE(dot11MeshHWMPmaxPREQretries,
@@ -534,6 +536,7 @@ static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
         MESHPARAMS_ADD(dot11MeshMaxPeerLinks);
         MESHPARAMS_ADD(dot11MeshHWMPactivePathTimeout);
         MESHPARAMS_ADD(dot11MeshHWMPpreqMinInterval);
+        MESHPARAMS_ADD(dot11MeshHWMPperrMinInterval);
         MESHPARAMS_ADD(dot11MeshHWMPnetDiameterTraversalTime);
         MESHPARAMS_ADD(dot11MeshHWMPmaxPREQretries);
         MESHPARAMS_ADD(path_refresh_time);
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 7a757a97ba37..a785d61defe1 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -514,7 +514,9 @@ struct ieee80211_if_mesh {
         atomic_t mpaths;
         /* Timestamp of last SN update */
         unsigned long last_sn_update;
-        /* Timestamp of last SN sent */
+        /* Time when it's ok to send next PERR */
+        unsigned long next_perr;
+        /* Timestamp of last PREQ sent */
         unsigned long last_preq;
         struct mesh_rmc *rmc;
         spinlock_t mesh_preq_queue_lock;
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index ee82d2f7f114..c707c8bf6d2c 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -749,6 +749,7 @@ void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
         atomic_set(&ifmsh->mpaths, 0);
         mesh_rmc_init(sdata);
         ifmsh->last_preq = jiffies;
+        ifmsh->next_perr = jiffies;
         /* Allocate all mesh structures when creating the first mesh interface. */
         if (!mesh_allocated)
                 ieee80211s_init();
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 208ba35661f9..fe93386d6aa9 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -241,11 +241,15 @@ int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
 {
         struct ieee80211_local *local = sdata->local;
         struct sk_buff *skb;
+        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
         struct ieee80211_mgmt *mgmt;
         u8 *pos, ie_len;
         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
                       sizeof(mgmt->u.action.u.mesh_action);
 
+        if (time_before(jiffies, ifmsh->next_perr))
+                return -EAGAIN;
+
         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                             hdr_len +
                             2 + 15 /* PERR IE */);
@@ -290,6 +294,8 @@ int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
 
         /* see note in function header */
         prepare_frame_for_deferred_tx(sdata, skb);
+        ifmsh->next_perr = TU_TO_EXP_TIME(
+                                   ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
         ieee80211_add_pending_skb(local, skb);
         return 0;
 }
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index b7b7868f4128..8c550df13037 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -20,6 +20,7 @@
  * interface
  */
 #define MESH_PREQ_MIN_INT       10
+#define MESH_PERR_MIN_INT       100
 #define MESH_DIAM_TRAVERSAL_TIME 50
 
 /*
@@ -47,6 +48,7 @@ const struct mesh_config default_mesh_config = {
         .dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
         .dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
         .dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
+        .dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
         .dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
         .dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
         .path_refresh_time = MESH_PATH_REFRESH_TIME,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5699c3b1aba4..0ee512b85a1f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3195,6 +3195,8 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
                         cur_params.dot11MeshHWMPactivePathTimeout);
         NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
                         cur_params.dot11MeshHWMPpreqMinInterval);
+        NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
+                        cur_params.dot11MeshHWMPperrMinInterval);
         NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
                         cur_params.dot11MeshHWMPnetDiameterTraversalTime);
         NLA_PUT_U8(msg, NL80211_MESHCONF_HWMP_ROOTMODE,
@@ -3229,6 +3231,7 @@ static const struct nla_policy nl80211_meshconf_params_policy[NL80211_MESHCONF_A
         [NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT] = { .type = NLA_U16 },
         [NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT] = { .type = NLA_U32 },
         [NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL] = { .type = NLA_U16 },
+        [NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL] = { .type = NLA_U16 },
         [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 },
@@ -3303,6 +3306,9 @@ do {\
         FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPpreqMinInterval,
                         mask, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
                         nla_get_u16);
+        FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPperrMinInterval,
+                        mask, NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
+                        nla_get_u16);
         FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
                         dot11MeshHWMPnetDiameterTraversalTime,
                         mask, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,