netdev - [PATCH 15/17] batman-adv: Disallow mcast src address for data frames

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Message-Id: <20161109222606.29039-16-sw@simonwunderlich.de>
Date:   Wed,  9 Nov 2016 23:26:04 +0100
From:   Simon Wunderlich <sw@...onwunderlich.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        Sven Eckelmann <sven@...fation.org>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 15/17] batman-adv: Disallow mcast src address for data frames

From: Sven Eckelmann <sven@...fation.org>

The routing checks are validating the source mac address of the outer
ethernet header. They reject every source mac address which is a broadcast
address. But they also have to reject any multicast mac addresses.

Signed-off-by: Sven Eckelmann <sven@...fation.org>
[sw@...onwunderlich.de: fix commit message typo]
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
---
 net/batman-adv/routing.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 105d4fc..c02897b 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -368,8 +368,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	if (is_broadcast_ether_addr(ethhdr->h_dest))
 		goto free_skb;
 
-	/* packet with broadcast sender address */
-	if (is_broadcast_ether_addr(ethhdr->h_source))
+	/* packet with broadcast/multicast sender address */
+	if (is_multicast_ether_addr(ethhdr->h_source))
 		goto free_skb;
 
 	/* not for me */
@@ -466,8 +466,8 @@ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
 	if (is_broadcast_ether_addr(ethhdr->h_dest))
 		return -EBADR;
 
-	/* packet with broadcast sender address */
-	if (is_broadcast_ether_addr(ethhdr->h_source))
+	/* packet with broadcast/multicast sender address */
+	if (is_multicast_ether_addr(ethhdr->h_source))
 		return -EBADR;
 
 	/* not for me */
@@ -1159,8 +1159,8 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
 	if (!is_broadcast_ether_addr(ethhdr->h_dest))
 		goto free_skb;
 
-	/* packet with broadcast sender address */
-	if (is_broadcast_ether_addr(ethhdr->h_source))
+	/* packet with broadcast/multicast sender address */
+	if (is_multicast_ether_addr(ethhdr->h_source))
 		goto free_skb;
 
 	/* ignore broadcasts sent by myself */
-- 
2.10.1