BE16_TO_U16
mss = BE16_TO_U16(up+2);
new_swnd = BE16_TO_U16(((tcph_t *)tcph)->th_win);
new_swnd = BE16_TO_U16(tcph->th_win) <<
#define ABE16_TO_U16(p) BE16_TO_U16(p)
op = BE16_TO_U16(arh->arh_operation);
mss = BE16_TO_U16(up+2);
tcp_sum = BE16_TO_U16(ntcph->th_sum);