v6hdr
const struct ipv6hdr *v6hdr;
v6hdr = (const struct ipv6hdr *)(hdr + 1);
hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
hash = jhash_1word(v6hdr->nexthdr, hash);
struct v6hdr h_outer;
struct v6hdr h_outer = {0};