xfrm6_tunnel_spi_lookup
__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);