batman-adv: Add wrapper to look up neighbor and send skb

By adding batadv_send_skb_to_orig() in send.c, we can remove duplicate
code that looks up the next hop and then calls batadv_send_skb_packet().

Furthermore, this prepares the upcoming new implementation of
fragmentation, which requires the next hop to route packets.

Please note that this doesn't entirely remove the next-hop lookup in
routing.c and unicast.c, since it is used by the current fragmentation
code.

Also note that the next-hop info is removed from debug messages in
translation-table.c, since it is looked up elsewhere.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 8 insertions, 29 deletions

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 78d657264cbf..8d64348e3cc0 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -285,7 +285,6 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 {
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_orig_node *orig_node = NULL;
-	struct batadv_neigh_node *router = NULL;
 	struct batadv_icmp_packet_rr *icmp_packet;
 	int ret = NET_RX_DROP;
 
@@ -307,10 +306,6 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 	if (!orig_node)
 		goto out;
 
-	router = batadv_orig_node_get_router(orig_node);
-	if (!router)
-		goto out;
-
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, ETH_HLEN) < 0)
 		goto out;
@@ -322,14 +317,12 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 	icmp_packet->msg_type = BATADV_ECHO_REPLY;
 	icmp_packet->header.ttl = BATADV_TTL;
 
-	batadv_send_skb_packet(skb, router->if_incoming, router->addr);
-	ret = NET_RX_SUCCESS;
+	if (batadv_send_skb_to_orig(skb, orig_node, NULL))
+		ret = NET_RX_SUCCESS;
 
 out:
 	if (primary_if)
 		batadv_hardif_free_ref(primary_if);
-	if (router)
-		batadv_neigh_node_free_ref(router);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	return ret;
@@ -340,7 +333,6 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 {
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_orig_node *orig_node = NULL;
-	struct batadv_neigh_node *router = NULL;
 	struct batadv_icmp_packet *icmp_packet;
 	int ret = NET_RX_DROP;
 
@@ -362,10 +354,6 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	if (!orig_node)
 		goto out;
 
-	router = batadv_orig_node_get_router(orig_node);
-	if (!router)
-		goto out;
-
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, ETH_HLEN) < 0)
 		goto out;
@@ -377,14 +365,12 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
 	icmp_packet->header.ttl = BATADV_TTL;
 
-	batadv_send_skb_packet(skb, router->if_incoming, router->addr);
-	ret = NET_RX_SUCCESS;
+	if (batadv_send_skb_to_orig(skb, orig_node, NULL))
+		ret = NET_RX_SUCCESS;
 
 out:
 	if (primary_if)
 		batadv_hardif_free_ref(primary_if);
-	if (router)
-		batadv_neigh_node_free_ref(router);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	return ret;
@@ -398,7 +384,6 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	struct batadv_icmp_packet_rr *icmp_packet;
 	struct ethhdr *ethhdr;
 	struct batadv_orig_node *orig_node = NULL;
-	struct batadv_neigh_node *router = NULL;
 	int hdr_size = sizeof(struct batadv_icmp_packet);
 	int ret = NET_RX_DROP;
 
@@ -447,10 +432,6 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	if (!orig_node)
 		goto out;
 
-	router = batadv_orig_node_get_router(orig_node);
-	if (!router)
-		goto out;
-
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, ETH_HLEN) < 0)
 		goto out;
@@ -461,12 +442,10 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet->header.ttl--;
 
 	/* route it */
-	batadv_send_skb_packet(skb, router->if_incoming, router->addr);
-	ret = NET_RX_SUCCESS;
+	if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
+		ret = NET_RX_SUCCESS;
 
 out:
-	if (router)
-		batadv_neigh_node_free_ref(router);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	return ret;
@@ -882,8 +861,8 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 			   skb->len + ETH_HLEN);
 
 	/* route it */
-	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
-	ret = NET_RX_SUCCESS;
+	if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
+		ret = NET_RX_SUCCESS;
 
 out:
 	if (neigh_node)