static void mark_pkt_end(struct bpf_verifier_state *vstate, int regn, bool range_open)
{
	struct bpf_func_state *state = vstate->frame[vstate->curframe];
	struct bpf_reg_state *reg = &state->regs[regn];

	if (reg->type != PTR_TO_PACKET)
		/* PTR_TO_PACKET_META is not supported yet */
		return;

	/* The 'reg' is pkt > pkt_end or pkt >= pkt_end.
	 * How far beyond pkt_end it goes is unknown.
	 * if (!range_open) it's the case of pkt >= pkt_end
	 * if (range_open) it's the case of pkt > pkt_end
	 * hence this pointer is at least 1 byte bigger than pkt_end
	 */
	if (range_open)
		reg->range = BEYOND_PKT_END;
	else
		reg->range = AT_PKT_END;
}
static void mark_pkt_end(struct bpf_verifier_state *vstate, int regn, bool range_open)
{
	struct bpf_func_state *state = vstate->frame[vstate->curframe];
	struct bpf_reg_state *reg = &state->regs[regn];

	if (reg->type != PTR_TO_PACKET)
		 
		return;

	 
	if (range_open)
		reg->range = BEYOND_PKT_END;
	else
		reg->range = AT_PKT_END;
}