TCPOLEN_MD5SIG_ALIGNED
arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
remaining -= TCPOLEN_MD5SIG_ALIGNED;
size += TCPOLEN_MD5SIG_ALIGNED;
remaining -= TCPOLEN_MD5SIG_ALIGNED;
tot_len += TCPOLEN_MD5SIG_ALIGNED;