l2cap_getopt
int l2cap_getopt(struct l2cap_channel *, int, void *);
m->m_len = l2cap_getopt(pcb, sopt->sopt_name, mtod(m, void *));
(void)l2cap_getopt(so->so_pcb, SO_L2CAP_LM, &mode);
(void)l2cap_getopt(rs->rs_l2cap, SO_L2CAP_OMTU, &rs->rs_mtu);
l2cap_getopt(rs->rs_l2cap, SO_L2CAP_OMTU, &rs->rs_mtu);