TCPOLEN_MPTCP_DSS_CHECKSUM
len += TCPOLEN_MPTCP_DSS_CHECKSUM;
len += TCPOLEN_MPTCP_DSS_CHECKSUM;
opsize != expected_opsize + TCPOLEN_MPTCP_DSS_CHECKSUM)
if (opsize == expected_opsize + TCPOLEN_MPTCP_DSS_CHECKSUM) {
len += TCPOLEN_MPTCP_DSS_CHECKSUM;
map_size += TCPOLEN_MPTCP_DSS_CHECKSUM;
#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)