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s390/qeth: robustify qeth_get_ip_version()

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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 <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2017-12-20 20:11:03 +01:00 committed by David S. Miller
parent 00c163f142
commit 19e36da61a
1 changed files with 8 additions and 6 deletions
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14
drivers/s390/net/qeth_core.h
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@ -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;