Staging: batman-adv: avoid having the same error message more than once

The routing code has 2 sections which warn about ttl exceeded. The
corresponding warnings were identical which makes it hard to debug. In
addition, batman-adv does not need to warn about ttl exceeded in case
we encountered an echo request as this is commonly used to generate
traceroute graphs.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/routing.c

@@ -655,14 +655,15 @@ static int recv_icmp_ttl_exceeded(struct sk_buff *skb)
 	unsigned long flags;
 	uint8_t dstaddr[ETH_ALEN];
 
-	icmp_packet = (struct icmp_packet *) skb->data;
-	ethhdr = (struct ethhdr *) skb_mac_header(skb);
-
-	printk(KERN_WARNING "batman-adv:Warning - can't send packet from %pM to %pM: ttl exceeded\n", icmp_packet->orig, icmp_packet->dst);
+	icmp_packet = (struct icmp_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
 
 	/* send TTL exceeded if packet is an echo request (traceroute) */
-	if (icmp_packet->msg_type != ECHO_REQUEST)
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		printk(KERN_WARNING "batman-adv:Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
+			icmp_packet->orig, icmp_packet->dst);
 		return NET_RX_DROP;
+	}
 
 	/* get routing information */
 	spin_lock_irqsave(&orig_hash_lock, flags);
@@ -825,7 +826,8 @@ int recv_unicast_packet(struct sk_buff *skb)
 
 	/* TTL exceeded */
 	if (unicast_packet->ttl < 2) {
-		printk(KERN_WARNING "batman-adv:Warning - can't send packet from %pM to %pM: ttl exceeded\n", ethhdr->h_source, unicast_packet->dest);
+		printk(KERN_WARNING "batman-adv:Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
+		       ethhdr->h_source, unicast_packet->dest);
 		return NET_RX_DROP;
 	}