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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-01-24 21:18:27 +0400
committerAntonio Quartulli <ordex@autistici.org>2013-01-27 17:02:39 +0400
commitb618ad1103c9ea0c4a69b44f42fc3c7b4e231e22 (patch)
tree58c80e65cc784f33ca4e627b867031fddb674430 /net/batman-adv
parent757dd82ea7008ddaccfecff3397bec3e3203a89e (diff)
downloadlinux-b618ad1103c9ea0c4a69b44f42fc3c7b4e231e22.tar.xz
batman-adv: filter ARP packets with invalid MAC addresses in DAT
We never want multicast MAC addresses in the Distributed ARP Table, so it's best to completely ignore ARP packets containing them where we expect unicast addresses. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.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>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/distributed-arp-table.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index ccb3c6c96ba7..183f97a86bb2 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -738,6 +738,7 @@ static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
struct arphdr *arphdr;
struct ethhdr *ethhdr;
__be32 ip_src, ip_dst;
+ uint8_t *hw_src, *hw_dst;
uint16_t type = 0;
/* pull the ethernet header */
@@ -782,6 +783,18 @@ static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst))
goto out;
+ hw_src = batadv_arp_hw_src(skb, hdr_size);
+ if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src))
+ goto out;
+
+ /* we don't care about the destination MAC address in ARP requests */
+ if (arphdr->ar_op != htons(ARPOP_REQUEST)) {
+ hw_dst = batadv_arp_hw_dst(skb, hdr_size);
+ if (is_zero_ether_addr(hw_dst) ||
+ is_multicast_ether_addr(hw_dst))
+ goto out;
+ }
+
type = ntohs(arphdr->ar_op);
out:
return type;