TCA_GACT_PROB
if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
if (tb[TCA_GACT_PROB] != NULL)
if (tb[TCA_GACT_PROB]) {
p_parm = nla_data(tb[TCA_GACT_PROB]);