【转】iphdr结构详解

include/linux/ip.h

struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8    ihl:4,
version:4;
#elif defined (__BIG_ENDIAN_BITFIELD)
__u8    version:4,
ihl:4;
#else
#error "Please fix <asm/byteorder.h>"