[B.A.T.M.A.N.] [PATCH v3 2/3] batman-adv: Disallow zero and mcast src address for mgmt frames

[Sven Eckelmann <sven@narfation.org>]

The routing check for management frames is validating the source mac
address in the outer ethernet header. It rejects every source mac address
which is a broadcast address. But it also has to reject the zero-mac
address and multicast mac addresses.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
v3:
 - Fix patch subject
v2:
 - clarify in commit message that only the outer ethernet header is
   affected
   (thanks Linus)
 - split in patch 1/2
---
 net/batman-adv/routing.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 913ab51..e2b91e6 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -196,8 +196,8 @@ bool batadv_check_management_packet(struct sk_buff *skb,
 	if (!is_broadcast_ether_addr(ethhdr->h_dest))
 		return false;
 
-	/* packet with broadcast sender address */
-	if (is_broadcast_ether_addr(ethhdr->h_source))
+	/* packet with invalid sender address */
+	if (!is_valid_ether_addr(ethhdr->h_source))
 		return false;
 
 	/* create a copy of the skb, if needed, to modify it. */
-- 
2.8.1