[26/29] Staging: batman-adv: best gw DHCP filter 802.1Q support
Commit Message
From: Marek Lindner <lindner_marek@yahoo.de>
The DHCP filter inspects packets to determine whether or not to send
them via ethernet unicast. This patch adds 802.1Q (vlan) support for
this check.
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
[sven.eckelmann@gmx.de: Rework on top of current version]
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
---
drivers/staging/batman-adv/gateway_client.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
@@ -415,6 +415,14 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
ethhdr = (struct ethhdr *)skb->data;
header_len += ETH_HLEN;
+ /* check for initial vlan header */
+ if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+ if (!pskb_may_pull(skb, header_len + VLAN_HLEN))
+ return 0;
+ ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
+ header_len += VLAN_HLEN;
+ }
+
/* check for ip header */
if (ntohs(ethhdr->h_proto) != ETH_P_IP)
return 0;