IFLA_CAIF_IPV6_CONNID
nla_put_u32(skb, IFLA_CAIF_IPV6_CONNID,
if (data[IFLA_CAIF_IPV6_CONNID])
nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
[IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 },