batman-adv: improved gateway tq-based selection

If a client issues a DHCPREQUEST for renewal, the packet is dropped
if the old destination (the old gateway for the client) TQ is smaller
than the current best gateway TQ less GW_THRESHOLD

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

1 files changed, 8 insertions, 2 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 3371ece680a2..2dcdbb7a236c 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -30,6 +30,7 @@
 #include "gateway_common.h"
 #include "gateway_client.h"
 #include "bat_sysfs.h"
+#include "originator.h"
 #include <linux/slab.h>
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
@@ -561,6 +562,7 @@ static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
         struct bcast_packet *bcast_packet;
         struct vlan_ethhdr *vhdr;
         struct softif_neigh *curr_softif_neigh = NULL;
+        struct orig_node *orig_node = NULL;
         int data_len = skb->len, ret;
         short vid = -1;
         bool do_bcast = false;
@@ -595,8 +597,10 @@ static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
         /* Register the client MAC in the transtable */
         tt_local_add(soft_iface, ethhdr->h_source);
 
-        if (is_multicast_ether_addr(ethhdr->h_dest)) {
-                ret = gw_is_target(bat_priv, skb);
+        orig_node = transtable_search(bat_priv, ethhdr->h_dest);
+        if (is_multicast_ether_addr(ethhdr->h_dest) ||
+                                (orig_node && orig_node->gw_flags)) {
+                ret = gw_is_target(bat_priv, skb, orig_node);
 
                 if (ret < 0)
                         goto dropped;
@@ -656,6 +660,8 @@ end:
                 softif_neigh_free_ref(curr_softif_neigh);
         if (primary_if)
                 hardif_free_ref(primary_if);
+        if (orig_node)
+                orig_node_free_ref(orig_node);
         return NETDEV_TX_OK;
 }