drm/radeon/kms/pm: fix segfault in clock code
[linux-2.6.git] / net / mac80211 / mesh.c
index b631703..6a43314 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008 open80211s Ltd.
+ * Copyright (c) 2008, 2009 open80211s Ltd.
  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
  *            Javier Cardona <javier@cozybit.com>
  *
 #include "ieee80211_i.h"
 #include "mesh.h"
 
-#define PP_OFFSET      1               /* Path Selection Protocol */
-#define PM_OFFSET      5               /* Path Selection Metric   */
-#define CC_OFFSET      9               /* Congestion Control Mode */
-#define CAPAB_OFFSET 17
-#define ACCEPT_PLINKS 0x80
+#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
+#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
+#define IEEE80211_MESH_RANN_INTERVAL        (1 * HZ)
+
+#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
+#define MESHCONF_CAPAB_FORWARDING    0x08
+
+#define TMR_RUNNING_HK 0
+#define TMR_RUNNING_MP 1
+#define TMR_RUNNING_MPR        2
 
 int mesh_allocated;
 static struct kmem_cache *rm_cache;
@@ -35,6 +40,22 @@ void ieee80211s_stop(void)
        kmem_cache_destroy(rm_cache);
 }
 
+static void ieee80211_mesh_housekeeping_timer(unsigned long data)
+{
+       struct ieee80211_sub_if_data *sdata = (void *) data;
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+       set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
+
+       if (local->quiescing) {
+               set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
+               return;
+       }
+
+       ieee80211_queue_work(&local->hw, &ifmsh->work);
+}
+
 /**
  * mesh_matches_local - check if the config of a mesh point matches ours
  *
@@ -46,7 +67,7 @@ void ieee80211s_stop(void)
  */
 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
 {
-       struct ieee80211_if_sta *sta = &sdata->u.sta;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
        /*
         * As support for each feature is added, check for matching
@@ -58,11 +79,13 @@ bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_dat
         *   - MDA enabled
         * - Power management control on fc
         */
-       if (sta->mesh_id_len == ie->mesh_id_len &&
-               memcmp(sta->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
-               memcmp(sta->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
-               memcmp(sta->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
-               memcmp(sta->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
+       if (ifmsh->mesh_id_len == ie->mesh_id_len &&
+               memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
+               (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
+               (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
+               (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
+               (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
+               (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
                return true;
 
        return false;
@@ -75,7 +98,8 @@ bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_dat
  */
 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 {
-       return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
+       return (ie->mesh_config->meshconf_cap &
+           MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 }
 
 /**
@@ -95,39 +119,39 @@ void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
         */
        free_plinks = mesh_plink_availables(sdata);
 
-       if (free_plinks != sdata->u.sta.accepting_plinks)
-               ieee80211_sta_timer((unsigned long) sdata);
+       if (free_plinks != sdata->u.mesh.accepting_plinks)
+               ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 }
 
-void mesh_ids_set_default(struct ieee80211_if_sta *sta)
+void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 {
-       u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
-
-       memcpy(sta->mesh_pp_id, def_id, 4);
-       memcpy(sta->mesh_pm_id, def_id, 4);
-       memcpy(sta->mesh_cc_id, def_id, 4);
+       sta->mesh_pp_id = 0;    /* HWMP */
+       sta->mesh_pm_id = 0;    /* Airtime */
+       sta->mesh_cc_id = 0;    /* Disabled */
+       sta->mesh_sp_id = 0;    /* Neighbor Offset */
+       sta->mesh_auth_id = 0;  /* Disabled */
 }
 
 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 {
        int i;
 
-       sdata->u.sta.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
-       if (!sdata->u.sta.rmc)
+       sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
+       if (!sdata->u.mesh.rmc)
                return -ENOMEM;
-       sdata->u.sta.rmc->idx_mask = RMC_BUCKETS - 1;
+       sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
        for (i = 0; i < RMC_BUCKETS; i++)
-               INIT_LIST_HEAD(&sdata->u.sta.rmc->bucket[i].list);
+               INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
        return 0;
 }
 
 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 {
-       struct mesh_rmc *rmc = sdata->u.sta.rmc;
+       struct mesh_rmc *rmc = sdata->u.mesh.rmc;
        struct rmc_entry *p, *n;
        int i;
 
-       if (!sdata->u.sta.rmc)
+       if (!sdata->u.mesh.rmc)
                return;
 
        for (i = 0; i < RMC_BUCKETS; i++)
@@ -137,7 +161,7 @@ void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
                }
 
        kfree(rmc);
-       sdata->u.sta.rmc = NULL;
+       sdata->u.mesh.rmc = NULL;
 }
 
 /**
@@ -155,7 +179,7 @@ void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
                   struct ieee80211_sub_if_data *sdata)
 {
-       struct mesh_rmc *rmc = sdata->u.sta.rmc;
+       struct mesh_rmc *rmc = sdata->u.mesh.rmc;
        u32 seqnum = 0;
        int entries = 0;
        u8 idx;
@@ -171,8 +195,8 @@ int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
                        list_del(&p->list);
                        kmem_cache_free(rm_cache, p);
                        --entries;
-               } else if ((seqnum == p->seqnum)
-                               && (memcmp(sa, p->sa, ETH_ALEN) == 0))
+               } else if ((seqnum == p->seqnum) &&
+                          (memcmp(sa, p->sa, ETH_ALEN) == 0))
                        return -1;
        }
 
@@ -194,6 +218,7 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
        struct ieee80211_supported_band *sband;
        u8 *pos;
        int len, i, rate;
+       u8 neighbors;
 
        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
        len = sband->n_bitrates;
@@ -217,39 +242,49 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
                }
        }
 
-       pos = skb_put(skb, 2 + sdata->u.sta.mesh_id_len);
+       if (sband->band == IEEE80211_BAND_2GHZ) {
+               pos = skb_put(skb, 2 + 1);
+               *pos++ = WLAN_EID_DS_PARAMS;
+               *pos++ = 1;
+               *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
+       }
+
+       pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
        *pos++ = WLAN_EID_MESH_ID;
-       *pos++ = sdata->u.sta.mesh_id_len;
-       if (sdata->u.sta.mesh_id_len)
-               memcpy(pos, sdata->u.sta.mesh_id, sdata->u.sta.mesh_id_len);
+       *pos++ = sdata->u.mesh.mesh_id_len;
+       if (sdata->u.mesh.mesh_id_len)
+               memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 
-       pos = skb_put(skb, 21);
+       pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
        *pos++ = WLAN_EID_MESH_CONFIG;
-       *pos++ = MESH_CFG_LEN;
-       /* Version */
-       *pos++ = 1;
+       *pos++ = sizeof(struct ieee80211_meshconf_ie);
 
        /* Active path selection protocol ID */
-       memcpy(pos, sdata->u.sta.mesh_pp_id, 4);
-       pos += 4;
+       *pos++ = sdata->u.mesh.mesh_pp_id;
 
        /* Active path selection metric ID   */
-       memcpy(pos, sdata->u.sta.mesh_pm_id, 4);
-       pos += 4;
+       *pos++ = sdata->u.mesh.mesh_pm_id;
 
        /* Congestion control mode identifier */
-       memcpy(pos, sdata->u.sta.mesh_cc_id, 4);
-       pos += 4;
+       *pos++ = sdata->u.mesh.mesh_cc_id;
 
-       /* Channel precedence:
-        * Not running simple channel unification protocol
-        */
-       memset(pos, 0x00, 4);
-       pos += 4;
+       /* Synchronization protocol identifier */
+       *pos++ = sdata->u.mesh.mesh_sp_id;
+
+       /* Authentication Protocol identifier */
+       *pos++ = sdata->u.mesh.mesh_auth_id;
+
+       /* Mesh Formation Info - number of neighbors */
+       neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
+       /* Number of neighbor mesh STAs or 15 whichever is smaller */
+       neighbors = (neighbors > 15) ? 15 : neighbors;
+       *pos++ = neighbors << 1;
 
        /* Mesh capability */
-       sdata->u.sta.accepting_plinks = mesh_plink_availables(sdata);
-       *pos++ = sdata->u.sta.accepting_plinks ? ACCEPT_PLINKS : 0x00;
+       sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
+       *pos = MESHCONF_CAPAB_FORWARDING;
+       *pos++ |= sdata->u.mesh.accepting_plinks ?
+           MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
        *pos++ = 0x00;
 
        return;
@@ -262,16 +297,6 @@ u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_t
                & tbl->hash_mask;
 }
 
-u8 mesh_id_hash(u8 *mesh_id, int mesh_id_len)
-{
-       if (!mesh_id_len)
-               return 1;
-       else if (mesh_id_len == 1)
-               return (u8) mesh_id[0];
-       else
-               return (u8) (mesh_id[0] + 2 * mesh_id[1]);
-}
-
 struct mesh_table *mesh_table_alloc(int size_order)
 {
        int i;
@@ -308,134 +333,431 @@ struct mesh_table *mesh_table_alloc(int size_order)
        return newtbl;
 }
 
-static void __mesh_table_free(struct mesh_table *tbl)
-{
-       kfree(tbl->hash_buckets);
-       kfree(tbl->hashwlock);
-       kfree(tbl);
-}
-
-void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
-{
-       struct hlist_head *mesh_hash;
-       struct hlist_node *p, *q;
-       int i;
-
-       mesh_hash = tbl->hash_buckets;
-       for (i = 0; i <= tbl->hash_mask; i++) {
-               spin_lock(&tbl->hashwlock[i]);
-               hlist_for_each_safe(p, q, &mesh_hash[i]) {
-                       tbl->free_node(p, free_leafs);
-                       atomic_dec(&tbl->entries);
-               }
-               spin_unlock(&tbl->hashwlock[i]);
-       }
-       __mesh_table_free(tbl);
-}
 
 static void ieee80211_mesh_path_timer(unsigned long data)
 {
        struct ieee80211_sub_if_data *sdata =
                (struct ieee80211_sub_if_data *) data;
-       struct ieee80211_if_sta *ifsta = &sdata->u.sta;
-       struct ieee80211_local *local = wdev_priv(&sdata->wdev);
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+       struct ieee80211_local *local = sdata->local;
 
-       queue_work(local->hw.workqueue, &ifsta->work);
+       if (local->quiescing) {
+               set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
+               return;
+       }
+
+       ieee80211_queue_work(&local->hw, &ifmsh->work);
 }
 
-struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
+static void ieee80211_mesh_path_root_timer(unsigned long data)
 {
-       struct mesh_table *newtbl;
-       struct hlist_head *oldhash;
-       struct hlist_node *p, *q;
-       int i;
-
-       if (atomic_read(&tbl->entries)
-                       < tbl->mean_chain_len * (tbl->hash_mask + 1))
-               goto endgrow;
+       struct ieee80211_sub_if_data *sdata =
+               (struct ieee80211_sub_if_data *) data;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+       struct ieee80211_local *local = sdata->local;
 
-       newtbl = mesh_table_alloc(tbl->size_order + 1);
-       if (!newtbl)
-               goto endgrow;
+       set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 
-       newtbl->free_node = tbl->free_node;
-       newtbl->mean_chain_len = tbl->mean_chain_len;
-       newtbl->copy_node = tbl->copy_node;
-       atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
+       if (local->quiescing) {
+               set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
+               return;
+       }
 
-       oldhash = tbl->hash_buckets;
-       for (i = 0; i <= tbl->hash_mask; i++)
-               hlist_for_each(p, &oldhash[i])
-                       if (tbl->copy_node(p, newtbl) < 0)
-                               goto errcopy;
+       ieee80211_queue_work(&local->hw, &ifmsh->work);
+}
 
-       return newtbl;
+void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
+{
+       if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
+               set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
+       else {
+               clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
+               /* stop running timer */
+               del_timer_sync(&ifmsh->mesh_path_root_timer);
+       }
+}
 
-errcopy:
-       for (i = 0; i <= newtbl->hash_mask; i++) {
-               hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
-                       tbl->free_node(p, 0);
+/**
+ * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
+ * @hdr:       802.11 frame header
+ * @fc:                frame control field
+ * @meshda:    destination address in the mesh
+ * @meshsa:    source address address in the mesh.  Same as TA, as frame is
+ *              locally originated.
+ *
+ * Return the length of the 802.11 (does not include a mesh control header)
+ */
+int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
+                                 const u8 *meshda, const u8 *meshsa)
+{
+       if (is_multicast_ether_addr(meshda)) {
+               *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
+               /* DA TA SA */
+               memcpy(hdr->addr1, meshda, ETH_ALEN);
+               memcpy(hdr->addr2, meshsa, ETH_ALEN);
+               memcpy(hdr->addr3, meshsa, ETH_ALEN);
+               return 24;
+       } else {
+               *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
+                               IEEE80211_FCTL_TODS);
+               /* RA TA DA SA */
+               memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
+               memcpy(hdr->addr2, meshsa, ETH_ALEN);
+               memcpy(hdr->addr3, meshda, ETH_ALEN);
+               memcpy(hdr->addr4, meshsa, ETH_ALEN);
+               return 30;
        }
-       __mesh_table_free(tbl);
-endgrow:
-       return NULL;
 }
 
 /**
  * ieee80211_new_mesh_header - create a new mesh header
  * @meshhdr:    uninitialized mesh header
  * @sdata:     mesh interface to be used
+ * @addr4:     addr4 of the mesh frame (1st in ae header)
+ *              may be NULL
+ * @addr5:     addr5 of the mesh frame (1st or 2nd in ae header)
+ *              may be NULL unless addr6 is present
+ * @addr6:     addr6 of the mesh frame (2nd or 3rd in ae header)
+ *             may be NULL unless addr5 is present
  *
  * Return the header length.
  */
 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
-               struct ieee80211_sub_if_data *sdata)
+               struct ieee80211_sub_if_data *sdata, char *addr4,
+               char *addr5, char *addr6)
+{
+       int aelen = 0;
+       memset(meshhdr, 0, sizeof(*meshhdr));
+       meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
+       put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
+       sdata->u.mesh.mesh_seqnum++;
+       if (addr4) {
+               meshhdr->flags |= MESH_FLAGS_AE_A4;
+               aelen += ETH_ALEN;
+               memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
+       }
+       if (addr5 && addr6) {
+               meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
+               aelen += 2 * ETH_ALEN;
+               if (!addr4) {
+                       memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
+                       memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
+               } else {
+                       memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
+                       memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
+               }
+       }
+       return 6 + aelen;
+}
+
+static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
+                          struct ieee80211_if_mesh *ifmsh)
+{
+       bool free_plinks;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+       printk(KERN_DEBUG "%s: running mesh housekeeping\n",
+              sdata->dev->name);
+#endif
+
+       ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
+       mesh_path_expire(sdata);
+
+       free_plinks = mesh_plink_availables(sdata);
+       if (free_plinks != sdata->u.mesh.accepting_plinks)
+               ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
+
+       mod_timer(&ifmsh->housekeeping_timer,
+                 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
+}
+
+static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
+{
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+       mesh_path_tx_root_frame(sdata);
+       mod_timer(&ifmsh->mesh_path_root_timer,
+                 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
+}
+
+#ifdef CONFIG_PM
+void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 {
-       meshhdr->flags = 0;
-       meshhdr->ttl = sdata->u.sta.mshcfg.dot11MeshTTL;
-       put_unaligned(cpu_to_le32(sdata->u.sta.mesh_seqnum), &meshhdr->seqnum);
-       sdata->u.sta.mesh_seqnum++;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
-       return 6;
+       /* might restart the timer but that doesn't matter */
+       cancel_work_sync(&ifmsh->work);
+
+       /* use atomic bitops in case both timers fire at the same time */
+
+       if (del_timer_sync(&ifmsh->housekeeping_timer))
+               set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
+       if (del_timer_sync(&ifmsh->mesh_path_timer))
+               set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
+       if (del_timer_sync(&ifmsh->mesh_path_root_timer))
+               set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
+}
+
+void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
+{
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+       if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
+               add_timer(&ifmsh->housekeeping_timer);
+       if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
+               add_timer(&ifmsh->mesh_path_timer);
+       if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
+               add_timer(&ifmsh->mesh_path_root_timer);
+       ieee80211_mesh_root_setup(ifmsh);
+}
+#endif
+
+void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
+{
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+       struct ieee80211_local *local = sdata->local;
+
+       set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
+       ieee80211_mesh_root_setup(ifmsh);
+       ieee80211_queue_work(&local->hw, &ifmsh->work);
+       sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
+       ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
+                                               BSS_CHANGED_BEACON_ENABLED |
+                                               BSS_CHANGED_BEACON_INT);
+}
+
+void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
+{
+       del_timer_sync(&sdata->u.mesh.housekeeping_timer);
+       del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
+       /*
+        * If the timer fired while we waited for it, it will have
+        * requeued the work. Now the work will be running again
+        * but will not rearm the timer again because it checks
+        * whether the interface is running, which, at this point,
+        * it no longer is.
+        */
+       cancel_work_sync(&sdata->u.mesh.work);
+
+       /*
+        * When we get here, the interface is marked down.
+        * Call synchronize_rcu() to wait for the RX path
+        * should it be using the interface and enqueuing
+        * frames at this very time on another CPU.
+        */
+       rcu_barrier(); /* Wait for RX path and call_rcu()'s */
+       skb_queue_purge(&sdata->u.mesh.skb_queue);
+}
+
+static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
+                                       u16 stype,
+                                       struct ieee80211_mgmt *mgmt,
+                                       size_t len,
+                                       struct ieee80211_rx_status *rx_status)
+{
+       struct ieee80211_local *local = sdata->local;
+       struct ieee802_11_elems elems;
+       struct ieee80211_channel *channel;
+       u32 supp_rates = 0;
+       size_t baselen;
+       int freq;
+       enum ieee80211_band band = rx_status->band;
+
+       /* ignore ProbeResp to foreign address */
+       if (stype == IEEE80211_STYPE_PROBE_RESP &&
+           compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
+               return;
+
+       baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
+       if (baselen > len)
+               return;
+
+       ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
+                              &elems);
+
+       if (elems.ds_params && elems.ds_params_len == 1)
+               freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
+       else
+               freq = rx_status->freq;
+
+       channel = ieee80211_get_channel(local->hw.wiphy, freq);
+
+       if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
+               return;
+
+       if (elems.mesh_id && elems.mesh_config &&
+           mesh_matches_local(&elems, sdata)) {
+               supp_rates = ieee80211_sta_get_rates(local, &elems, band);
+
+               mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
+                                     mesh_peer_accepts_plinks(&elems));
+       }
+}
+
+static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
+                                         struct ieee80211_mgmt *mgmt,
+                                         size_t len,
+                                         struct ieee80211_rx_status *rx_status)
+{
+       switch (mgmt->u.action.category) {
+       case MESH_PLINK_CATEGORY:
+               mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
+               break;
+       case MESH_PATH_SEL_CATEGORY:
+               mesh_rx_path_sel_frame(sdata, mgmt, len);
+               break;
+       }
+}
+
+static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
+                                         struct sk_buff *skb)
+{
+       struct ieee80211_rx_status *rx_status;
+       struct ieee80211_if_mesh *ifmsh;
+       struct ieee80211_mgmt *mgmt;
+       u16 stype;
+
+       ifmsh = &sdata->u.mesh;
+
+       rx_status = IEEE80211_SKB_RXCB(skb);
+       mgmt = (struct ieee80211_mgmt *) skb->data;
+       stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
+
+       switch (stype) {
+       case IEEE80211_STYPE_PROBE_RESP:
+       case IEEE80211_STYPE_BEACON:
+               ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
+                                           rx_status);
+               break;
+       case IEEE80211_STYPE_ACTION:
+               ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
+               break;
+       }
+
+       kfree_skb(skb);
+}
+
+static void ieee80211_mesh_work(struct work_struct *work)
+{
+       struct ieee80211_sub_if_data *sdata =
+               container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+       struct sk_buff *skb;
+
+       if (!netif_running(sdata->dev))
+               return;
+
+       if (local->scanning)
+               return;
+
+       while ((skb = skb_dequeue(&ifmsh->skb_queue)))
+               ieee80211_mesh_rx_queued_mgmt(sdata, skb);
+
+       if (ifmsh->preq_queue_len &&
+           time_after(jiffies,
+                      ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
+               mesh_path_start_discovery(sdata);
+
+       if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
+               mesh_mpath_table_grow();
+
+       if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
+               mesh_mpp_table_grow();
+
+       if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
+               ieee80211_mesh_housekeeping(sdata, ifmsh);
+
+       if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
+               ieee80211_mesh_rootpath(sdata);
+}
+
+void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
+{
+       struct ieee80211_sub_if_data *sdata;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(sdata, &local->interfaces, list)
+               if (ieee80211_vif_is_mesh(&sdata->vif))
+                       ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
+       rcu_read_unlock();
 }
 
 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 {
-       struct ieee80211_if_sta *ifsta = &sdata->u.sta;
-
-       ifsta->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
-       ifsta->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
-       ifsta->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
-       ifsta->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
-       ifsta->mshcfg.dot11MeshTTL = MESH_TTL;
-       ifsta->mshcfg.auto_open_plinks = true;
-       ifsta->mshcfg.dot11MeshMaxPeerLinks =
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+
+       INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
+       setup_timer(&ifmsh->housekeeping_timer,
+                   ieee80211_mesh_housekeeping_timer,
+                   (unsigned long) sdata);
+       skb_queue_head_init(&sdata->u.mesh.skb_queue);
+
+       ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
+       ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
+       ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
+       ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
+       ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
+       ifmsh->mshcfg.auto_open_plinks = true;
+       ifmsh->mshcfg.dot11MeshMaxPeerLinks =
                MESH_MAX_ESTAB_PLINKS;
-       ifsta->mshcfg.dot11MeshHWMPactivePathTimeout =
+       ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
                MESH_PATH_TIMEOUT;
-       ifsta->mshcfg.dot11MeshHWMPpreqMinInterval =
+       ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
                MESH_PREQ_MIN_INT;
-       ifsta->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
+       ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
                MESH_DIAM_TRAVERSAL_TIME;
-       ifsta->mshcfg.dot11MeshHWMPmaxPREQretries =
+       ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
                MESH_MAX_PREQ_RETRIES;
-       ifsta->mshcfg.path_refresh_time =
+       ifmsh->mshcfg.path_refresh_time =
                MESH_PATH_REFRESH_TIME;
-       ifsta->mshcfg.min_discovery_timeout =
+       ifmsh->mshcfg.min_discovery_timeout =
                MESH_MIN_DISCOVERY_TIMEOUT;
-       ifsta->accepting_plinks = true;
-       ifsta->preq_id = 0;
-       ifsta->dsn = 0;
-       atomic_set(&ifsta->mpaths, 0);
+       ifmsh->accepting_plinks = true;
+       ifmsh->preq_id = 0;
+       ifmsh->sn = 0;
+       atomic_set(&ifmsh->mpaths, 0);
        mesh_rmc_init(sdata);
-       ifsta->last_preq = jiffies;
+       ifmsh->last_preq = jiffies;
        /* Allocate all mesh structures when creating the first mesh interface. */
        if (!mesh_allocated)
                ieee80211s_init();
-       mesh_ids_set_default(ifsta);
-       setup_timer(&ifsta->mesh_path_timer,
+       mesh_ids_set_default(ifmsh);
+       setup_timer(&ifmsh->mesh_path_timer,
                    ieee80211_mesh_path_timer,
                    (unsigned long) sdata);
-       INIT_LIST_HEAD(&ifsta->preq_queue.list);
-       spin_lock_init(&ifsta->mesh_preq_queue_lock);
+       setup_timer(&ifmsh->mesh_path_root_timer,
+                   ieee80211_mesh_path_root_timer,
+                   (unsigned long) sdata);
+       INIT_LIST_HEAD(&ifmsh->preq_queue.list);
+       spin_lock_init(&ifmsh->mesh_preq_queue_lock);
+}
+
+ieee80211_rx_result
+ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
+{
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+       struct ieee80211_mgmt *mgmt;
+       u16 fc;
+
+       if (skb->len < 24)
+               return RX_DROP_MONITOR;
+
+       mgmt = (struct ieee80211_mgmt *) skb->data;
+       fc = le16_to_cpu(mgmt->frame_control);
+
+       switch (fc & IEEE80211_FCTL_STYPE) {
+       case IEEE80211_STYPE_ACTION:
+               if (skb->len < IEEE80211_MIN_ACTION_SIZE)
+                       return RX_DROP_MONITOR;
+               /* fall through */
+       case IEEE80211_STYPE_PROBE_RESP:
+       case IEEE80211_STYPE_BEACON:
+               skb_queue_tail(&ifmsh->skb_queue, skb);
+               ieee80211_queue_work(&local->hw, &ifmsh->work);
+               return RX_QUEUED;
+       }
+
+       return RX_CONTINUE;
 }