CMSG_VALID
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);
CMSG_VALID(cmsg, control, (uintptr_t)control + controllen);