CCP_HDRLEN
if (len < CCP_HDRLEN)
if (clen < CCP_HDRLEN + CCP_OPT_MINLEN
|| clen < CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN))
dp += CCP_HDRLEN;
clen -= CCP_HDRLEN;
if (len < PPP_HDRLEN + CCP_HDRLEN) {
clen >= CCP_HDRLEN + CCP_OPT_MINLEN &&
clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
dp + CCP_HDRLEN, clen - CCP_HDRLEN,
cp_rstate, dp + CCP_HDRLEN,
clen - CCP_HDRLEN, cp->cp_unit, 0,