TCPOLEN_SACK_BASE
int num_sacks = min(TCP_NUM_SACKS, (ptr[1] - TCPOLEN_SACK_BASE) >> 3);
if ((opsize >= (TCPOLEN_SACK_BASE + TCPOLEN_SACK_PERBLOCK)) &&
!((opsize - TCPOLEN_SACK_BASE) % TCPOLEN_SACK_PERBLOCK) &&
(TCPOLEN_SACK_BASE + (opts->num_sack_blocks *
&& opsize >= (TCPOLEN_SACK_BASE
&& !((opsize - TCPOLEN_SACK_BASE)
i < (opsize - TCPOLEN_SACK_BASE);
oplen_a -= TCPOLEN_SACK_BASE;
oplen_b -= TCPOLEN_SACK_BASE;