Revert: "Staging: batman-adv: Adding netfilter-bridge hooks"

This reverts commit 96d592ed599434d2d5f339a1d282871bc6377d2c.

The netfilter hook seems to be misused and may leak skbs in situations
when NF_HOOK returns NF_STOLEN. It may not filter everything as
expected. Also the ethernet bridge tables are not yet capable to
understand batman-adv packet correctly.

It was only added for testing purposes and can be removed again.

Reported-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/hard-interface.c

@@ -30,7 +30,6 @@
 #include "hash.h"
 
 #include <linux/if_arp.h>
-#include <linux/netfilter_bridge.h>
 
 #define MIN(x, y) ((x) < (y) ? (x) : (y))
 
@@ -431,11 +430,6 @@ out:
 	return NOTIFY_DONE;
 }
 
-static int batman_skb_recv_finish(struct sk_buff *skb)
-{
-	return NF_ACCEPT;
-}
-
 /* receive a packet with the batman ethertype coming on a hard
  * interface */
 int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
@@ -456,13 +450,6 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 	if (atomic_read(&module_state) != MODULE_ACTIVE)
 		goto err_free;
 
-	/* if netfilter/ebtables wants to block incoming batman
-	 * packets then give them a chance to do so here */
-	ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL,
-		      batman_skb_recv_finish);
-	if (ret != 1)
-		goto err_out;
-
 	/* packet should hold at least type and version */
 	if (unlikely(skb_headlen(skb) < 2))
 		goto err_free;

drivers/staging/batman-adv/send.c

@@ -29,7 +29,6 @@
 #include "vis.h"
 #include "aggregation.h"
 
-#include <linux/netfilter_bridge.h>
 
 static void send_outstanding_bcast_packet(struct work_struct *work);
 
@@ -92,12 +91,9 @@ int send_skb_packet(struct sk_buff *skb,
 
 	/* dev_queue_xmit() returns a negative result on error.	 However on
 	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
-	 * (which is > 0). This will not be treated as an error.
-	 * Also, if netfilter/ebtables wants to block outgoing batman
-	 * packets then giving them a chance to do so here */
+	 * (which is > 0). This will not be treated as an error. */
 
-	return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
-		       dev_queue_xmit);
+	return dev_queue_xmit(skb);
 send_skb_err:
 	kfree_skb(skb);
 	return NET_XMIT_DROP;