batman-adv: Distributed ARP Table - add runtime switch

This patch adds a runtime switch that enables the user to turn the DAT feature
on or off at runtime

Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index f43bf8e4a2b7..c1a74a126f58 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -621,6 +621,9 @@ out:
  */
 static void batadv_dat_hash_free(struct batadv_priv *bat_priv)
 {
+        if (!bat_priv->dat.hash)
+                return;
+
         __batadv_dat_purge(bat_priv, NULL);
 
         batadv_hash_destroy(bat_priv->dat.hash);
@@ -790,6 +793,9 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
         struct sk_buff *skb_new;
         struct batadv_hard_iface *primary_if = NULL;
 
+        if (!atomic_read(&bat_priv->distributed_arp_table))
+                goto out;
+
         type = batadv_arp_get_type(bat_priv, skb, 0);
         /* If the node gets an ARP_REQUEST it has to send a DHT_GET unicast
          * message to the selected DHT candidates
@@ -861,6 +867,9 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
         bool ret = false;
         int err;
 
+        if (!atomic_read(&bat_priv->distributed_arp_table))
+                goto out;
+
         type = batadv_arp_get_type(bat_priv, skb, hdr_size);
         if (type != ARPOP_REQUEST)
                 goto out;
@@ -924,6 +933,9 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
         __be32 ip_src, ip_dst;
         uint8_t *hw_src, *hw_dst;
 
+        if (!atomic_read(&bat_priv->distributed_arp_table))
+                return;
+
         type = batadv_arp_get_type(bat_priv, skb, 0);
         if (type != ARPOP_REPLY)
                 return;
@@ -959,6 +971,9 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
         uint8_t *hw_src, *hw_dst;
         bool ret = false;
 
+        if (!atomic_read(&bat_priv->distributed_arp_table))
+                goto out;
+
         type = batadv_arp_get_type(bat_priv, skb, hdr_size);
         if (type != ARPOP_REPLY)
                 goto out;
@@ -1003,6 +1018,9 @@ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
         bool ret = false;
         const size_t bcast_len = sizeof(struct batadv_bcast_packet);
 
+        if (!atomic_read(&bat_priv->distributed_arp_table))
+                goto out;
+
         /* If this packet is an ARP_REQUEST and the node already has the
          * information that it is going to ask, then the packet can be dropped
          */