pskb_may_pull() can change skb->data, so we need to load ipv6h/ershdr at
the right place.
Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Cc: William Tu <u9012063@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
struct ip6_tnl *tunnel;
u8 ver;
- ipv6h = ipv6_hdr(skb);
- ershdr = (struct erspan_base_hdr *)skb->data;
-
if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
return PACKET_REJECT;
+ ipv6h = ipv6_hdr(skb);
+ ershdr = (struct erspan_base_hdr *)skb->data;
ver = (ntohs(ershdr->ver_vlan) & VER_MASK) >> VER_OFFSET;
tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);