Correct .gbs.conf settings

[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / batman-adv / originator.c

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 6df12a2..abf612d 100644 (file)
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -458,18 +458,59 @@ out:
 }
 
 /**
+ * batadv_neigh_node_get - retrieve a neighbour from the list
+ * @orig_node: originator which the neighbour belongs to
+ * @hard_iface: the interface where this neighbour is connected to
+ * @addr: the address of the neighbour
+ *
+ * Looks for and possibly returns a neighbour belonging to this originator list
+ * which is connected through the provided hard interface.
+ * Returns NULL if the neighbour is not found.
+ */
+struct batadv_neigh_node *
+batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
+                     const struct batadv_hard_iface *hard_iface,
+                     const uint8_t *addr)
+{
+       struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
+
+       rcu_read_lock();
+       hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
+               if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
+                       continue;
+
+               if (tmp_neigh_node->if_incoming != hard_iface)
+                       continue;
+
+               if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+                       continue;
+
+               res = tmp_neigh_node;
+               break;
+       }
+       rcu_read_unlock();
+
+       return res;
+}
+
+/**
  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
  * @rcu: rcu pointer of the orig_ifinfo object
  */
 static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
 {
        struct batadv_orig_ifinfo *orig_ifinfo;
+       struct batadv_neigh_node *router;
 
        orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
 
        if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
                batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
 
+       /* this is the last reference to this object */
+       router = rcu_dereference_protected(orig_ifinfo->router, true);
+       if (router)
+               batadv_neigh_node_free_ref_now(router);
        kfree(orig_ifinfo);
 }
 
@@ -661,6 +702,47 @@ free_orig_node:
 }
 
 /**
+ * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
+ * @bat_priv: the bat priv with all the soft interface information
+ * @neigh: orig node which is to be checked
+ */
+static void
+batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
+                         struct batadv_neigh_node *neigh)
+{
+       struct batadv_neigh_ifinfo *neigh_ifinfo;
+       struct batadv_hard_iface *if_outgoing;
+       struct hlist_node *node_tmp;
+
+       spin_lock_bh(&neigh->ifinfo_lock);
+
+       /* for all ifinfo objects for this neighinator */
+       hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
+                                 &neigh->ifinfo_list, list) {
+               if_outgoing = neigh_ifinfo->if_outgoing;
+
+               /* always keep the default interface */
+               if (if_outgoing == BATADV_IF_DEFAULT)
+                       continue;
+
+               /* don't purge if the interface is not (going) down */
+               if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
+                   (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
+                   (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
+                       continue;
+
+               batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+                          "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
+                          neigh->addr, if_outgoing->net_dev->name);
+
+               hlist_del_rcu(&neigh_ifinfo->list);
+               batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
+       }
+
+       spin_unlock_bh(&neigh->ifinfo_lock);
+}
+
+/**
  * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
  * @bat_priv: the bat priv with all the soft interface information
  * @orig_node: orig node which is to be checked
@@ -759,6 +841,11 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 
                        hlist_del_rcu(&neigh_node->list);
                        batadv_neigh_node_free_ref(neigh_node);
+               } else {
+                       /* only necessary if not the whole neighbor is to be
+                        * deleted, but some interface has been removed.
+                        */
+                       batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
                }
        }
 
@@ -816,7 +903,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 {
        struct batadv_neigh_node *best_neigh_node;
        struct batadv_hard_iface *hard_iface;
-       bool changed;
+       bool changed_ifinfo, changed_neigh;
 
        if (batadv_has_timed_out(orig_node->last_seen,
                                 2 * BATADV_PURGE_TIMEOUT)) {
@@ -826,10 +913,10 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
                           jiffies_to_msecs(orig_node->last_seen));
                return true;
        }
-       changed = batadv_purge_orig_ifinfo(bat_priv, orig_node);
-       changed = changed || batadv_purge_orig_neighbors(bat_priv, orig_node);
+       changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
+       changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
 
-       if (!changed)
+       if (!changed_ifinfo && !changed_neigh)
                return false;
 
        /* first for NULL ... */
@@ -987,7 +1074,8 @@ int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
        bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
 
 out:
-       batadv_hardif_free_ref(hard_iface);
+       if (hard_iface)
+               batadv_hardif_free_ref(hard_iface);
        return 0;
 }