batman-adv: implement AP-isolation on the receiver side

When a node receives a unicast packet it checks if the source and the
destination client can communicate or not due to the AP isolation

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

1 files changed, 42 insertions, 0 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index d6305645e08d..d0ed931ad2e7 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -781,6 +781,18 @@ static void tt_global_table_free(struct bat_priv *bat_priv)
         bat_priv->tt_global_hash = NULL;
 }
 
+static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
+                            struct tt_global_entry *tt_global_entry)
+{
+        bool ret = false;
+
+        if (tt_local_entry->flags & TT_CLIENT_WIFI &&
+            tt_global_entry->flags & TT_CLIENT_WIFI)
+                ret = true;
+
+        return ret;
+}
+
 struct orig_node *transtable_search(struct bat_priv *bat_priv,
                                     const uint8_t *addr)
 {
@@ -1729,3 +1741,33 @@ void tt_commit_changes(struct bat_priv *bat_priv)
         atomic_inc(&bat_priv->ttvn);
         bat_priv->tt_poss_change = false;
 }
+
+bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
+{
+        struct tt_local_entry *tt_local_entry = NULL;
+        struct tt_global_entry *tt_global_entry = NULL;
+        bool ret = true;
+
+        if (!atomic_read(&bat_priv->ap_isolation))
+                return false;
+
+        tt_local_entry = tt_local_hash_find(bat_priv, dst);
+        if (!tt_local_entry)
+                goto out;
+
+        tt_global_entry = tt_global_hash_find(bat_priv, src);
+        if (!tt_global_entry)
+                goto out;
+
+        if (_is_ap_isolated(tt_local_entry, tt_global_entry))
+                goto out;
+
+        ret = false;
+
+out:
+        if (tt_global_entry)
+                tt_global_entry_free_ref(tt_global_entry);
+        if (tt_local_entry)
+                tt_local_entry_free_ref(tt_local_entry);
+        return ret;
+}