batman-adv: Return reason for failure in batadv_check_unicast_packet()

batadv_check_unicast_packet() is changed to return a value based on the
reason to drop the packet, which will be useful information for
future users of batadv_check_unicast_packet().

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

1 files changed, 14 insertions, 4 deletions

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 5ee21cebbbb0..322c97ac10c7 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -548,27 +548,37 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig,
         return router;
 }
 
+/**
+ * batadv_check_unicast_packet - Check for malformed unicast packets
+ * @skb: packet to check
+ * @hdr_size: size of header to pull
+ *
+ * Check for short header and bad addresses in given packet. Returns negative
+ * value when check fails and 0 otherwise. The negative value depends on the
+ * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
+ * and -EREMOTE for non-local (other host) destination.
+ */
 static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size)
 {
         struct ethhdr *ethhdr;
 
         /* drop packet if it has not necessary minimum size */
         if (unlikely(!pskb_may_pull(skb, hdr_size)))
-                return -1;
+                return -ENODATA;
 
         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 
         /* packet with unicast indication but broadcast recipient */
         if (is_broadcast_ether_addr(ethhdr->h_dest))
-                return -1;
+                return -EBADR;
 
         /* packet with broadcast sender address */
         if (is_broadcast_ether_addr(ethhdr->h_source))
-                return -1;
+                return -EBADR;
 
         /* not for me */
         if (!batadv_is_my_mac(ethhdr->h_dest))
-                return -1;
+                return -EREMOTE;
 
         return 0;
 }