batman-adv: fix removing neigh_ifinfo

When an interface is removed separately, all neighbors need to be
checked if they have a neigh_ifinfo structure for that particular
interface. If that is the case, remove that ifinfo so any references to
a hard interface can be freed.

This is a regression introduced by
89652331c00f43574515059ecbf262d26d885717
("batman-adv: split tq information in neigh_node struct")

Reported-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 8104c3cf7741..1785da37b82c 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -707,6 +707,47 @@ 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
@@ -805,6 +846,11 @@ 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);
                 }
         }