From 19e36da61a90fe95116634f66196cc9b2e61b368 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 20 Dec 2017 20:11:03 +0100 Subject: [PATCH] s390/qeth: robustify qeth_get_ip_version() Instead of assuming that skb->data points to the Ethernet header, use the right helper and struct to access the Ethertype field. Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core.h | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index f5ee62c..af9d1ef 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -847,14 +847,16 @@ static inline int qeth_get_micros(void) static inline int qeth_get_ip_version(struct sk_buff *skb) { - __be16 *p = &((struct ethhdr *)skb->data)->h_proto; + struct vlan_ethhdr *veth = vlan_eth_hdr(skb); + __be16 prot = veth->h_vlan_proto; - if (be16_to_cpu(*p) == ETH_P_8021Q) - p += 2; - switch (be16_to_cpu(*p)) { - case ETH_P_IPV6: + if (prot == htons(ETH_P_8021Q)) + prot = veth->h_vlan_encapsulated_proto; + + switch (prot) { + case htons(ETH_P_IPV6): return 6; - case ETH_P_IP: + case htons(ETH_P_IP): return 4; default: return 0; -- 2.7.4