TCP_CHECKSUM_OFFSET
((uint16_t *)(((uchar_t *)(ipha)) + ((hlen) + TCP_CHECKSUM_OFFSET)))
hck_stuff += TCP_CHECKSUM_OFFSET;
cksum_off = TCP_CHECKSUM_OFFSET;
stuff = start + TCP_CHECKSUM_OFFSET;
stuff = (uint16_t *)(ptr + TCP_CHECKSUM_OFFSET);