#include <stdint.h>
#include <stdio.h>
#include <string.h>

#define __sso_be __attribute__((scalar_storage_order("big-endian")))

struct __sso_be ipv6hdr {
uint32_t
	version:4,
	tos:8,
	flow_lbl:20;
};

int main()
{
	struct ipv6hdr hdr;

	memcpy(&hdr, "\x60\x01\x23\x45", 4);

	printf("size: 	%ld\n\n", sizeof(hdr));

	printf("version:	%x\n", hdr.version);
	printf("tos:		%x\n", hdr.tos);
	printf("flow_lbl:	%x\n\n", hdr.flow_lbl);

	return 0;
}