[PATCH net-next 01/10] batman-adv: dat: drop non-4addr backwards compatibility

[Simon Wunderlich <sw@simonwunderlich.de>]

From: Sven Eckelmann <sven@narfation.org>

The 4addr unicast packet support is mandatory in compat version 15. No
older compat version is supported and the kernel doesn't need to keep code
to talk to nodes which cannot be in the same mesh.

Acked-by: Antonio Quartulli <antonio@mandelbit.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/distributed-arp-table.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index a6fe4820f65b9..c5fca53f3074c 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -1277,17 +1277,9 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	if (!skb_new)
 		goto out;
 
-	/* To preserve backwards compatibility, the node has choose the outgoing
-	 * format based on the incoming request packet type. The assumption is
-	 * that a node not using the 4addr packet format doesn't support it.
-	 */
-	if (hdr_size == sizeof(struct batadv_unicast_4addr_packet))
-		err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new,
-						   BATADV_P_DAT_CACHE_REPLY,
-						   NULL, vid);
-	else
-		err = batadv_send_skb_via_tt(bat_priv, skb_new, NULL, vid);
-
+	err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new,
+					   BATADV_P_DAT_CACHE_REPLY,
+					   NULL, vid);
 	if (err != NET_XMIT_DROP) {
 		batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX);
 		ret = true;
-- 
2.47.3