snl_get_msg_offset
int off = snl_get_msg_offset(nw);
nla->nla_len = NETLINK_ALIGN(snl_get_msg_offset(nw) - off);
rtnh->rtnh_len = snl_get_msg_offset(&nw) - off2;
off2 = snl_get_msg_offset(&nw);
rtnh->rtnh_len = snl_get_msg_offset(&nw) - off2;
off2 = snl_get_msg_offset(&nw);
rtnh->rtnh_len = snl_get_msg_offset(&nw) - off2;
off2 = snl_get_msg_offset(&nw);
rtnh->rtnh_len = snl_get_msg_offset(&nw) - off2;
off2 = snl_get_msg_offset(&nw);
rtnh->rtnh_len = snl_get_msg_offset(&nw) - off2;
off2 = snl_get_msg_offset(&nw);