[PATCH batadv] batman-adv: dat: drop non-4addr backwards compatibility

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.

Signed-off-by: Sven Eckelmann <[email protected]>
---
 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 25004ce3..a5c9b6d0 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -1372,17 +1372,9 @@ 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;

---
base-commit: 22b12d005035f37f898e5bf80480719fe1ef4fba
change-id: 20260702-dat-drop-non-4addr-fa818e01e487

Best regards,
--  
Sven Eckelmann <[email protected]>