TSOL_CIPSO_MIN_LENGTH
if (optlen < TSOL_CIPSO_MIN_LENGTH || optlen > TSOL_CIPSO_MAX_LENGTH)
if (opt[1] == TSOL_CIPSO_MIN_LENGTH) { /* no tags */
optlen -= TSOL_CIPSO_MIN_LENGTH;
opt += TSOL_CIPSO_MIN_LENGTH;