batman-adv: Explicitly mark the common header structure

All batman-adv packets have a common 3 byte header. It can be used to share
some code between different code paths, but it was never explicit stated that
this header has to be always the same for all packets. Therefore, new code
changes always have the problem that they may accidently introduce regressions
by moving some elements around.

A new structure is introduced that contains the common header and makes it
easier visible that these 3 bytes have to be the same for all on-wire packets.

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

1 files changed, 9 insertions, 9 deletions

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 773e606f9702..4363d197aebc 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -320,7 +320,7 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
 	icmp_packet->msg_type = ECHO_REPLY;
-	icmp_packet->ttl = TTL;
+	icmp_packet->header.ttl = TTL;
 
 	send_skb_packet(skb, router->if_incoming, router->addr);
 	ret = NET_RX_SUCCESS;
@@ -376,7 +376,7 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
 	icmp_packet->msg_type = TTL_EXCEEDED;
-	icmp_packet->ttl = TTL;
+	icmp_packet->header.ttl = TTL;
 
 	send_skb_packet(skb, router->if_incoming, router->addr);
 	ret = NET_RX_SUCCESS;
@@ -441,7 +441,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 		return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 
 	/* TTL exceeded */
-	if (icmp_packet->ttl < 2)
+	if (icmp_packet->header.ttl < 2)
 		return recv_icmp_ttl_exceeded(bat_priv, skb);
 
 	/* get routing information */
@@ -460,7 +460,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	icmp_packet = (struct icmp_packet_rr *)skb->data;
 
 	/* decrement ttl */
-	icmp_packet->ttl--;
+	icmp_packet->header.ttl--;
 
 	/* route it */
 	send_skb_packet(skb, router->if_incoming, router->addr);
@@ -815,7 +815,7 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	unicast_packet = (struct unicast_packet *)skb->data;
 
 	/* TTL exceeded */
-	if (unicast_packet->ttl < 2) {
+	if (unicast_packet->header.ttl < 2) {
 		pr_debug("Warning - can't forward unicast packet from %pM to "
 			 "%pM: ttl exceeded\n", ethhdr->h_source,
 			 unicast_packet->dest);
@@ -840,7 +840,7 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 
 	unicast_packet = (struct unicast_packet *)skb->data;
 
-	if (unicast_packet->packet_type == BAT_UNICAST &&
+	if (unicast_packet->header.packet_type == BAT_UNICAST &&
 	    atomic_read(&bat_priv->fragmentation) &&
 	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
 		ret = frag_send_skb(skb, bat_priv,
@@ -848,7 +848,7 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 		goto out;
 	}
 
-	if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
+	if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG &&
 	    frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
 
 		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
@@ -867,7 +867,7 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	}
 
 	/* decrement ttl */
-	unicast_packet->ttl--;
+	unicast_packet->header.ttl--;
 
 	/* route it */
 	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
@@ -1041,7 +1041,7 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	if (is_my_mac(bcast_packet->orig))
 		goto out;
 
-	if (bcast_packet->ttl < 2)
+	if (bcast_packet->header.ttl < 2)
 		goto out;
 
 	orig_node = orig_hash_find(bat_priv, bcast_packet->orig);