OPTION_MPTCP_MPJ_ACK
mp_opt->suboptions |= OPTION_MPTCP_MPJ_ACK;
opts->suboptions = OPTION_MPTCP_MPJ_ACK;
(opts->suboptions & (OPTION_MPTCP_MPJ_ACK | OPTION_MPTCP_MPC_ACK)) ||
OPTION_MPTCP_MPJ_ACK)
opt_mp_join = !!(mp_opt.suboptions & OPTION_MPTCP_MPJ_ACK);
if (!(mp_opt.suboptions & OPTION_MPTCP_MPJ_ACK))