/* $NetBSD: i4b_l2.c,v 1.24 2008/07/20 01:05:27 martin Exp $ */ /* * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *--------------------------------------------------------------------------- * * i4b_l2.c - ISDN layer 2 (Q.921) * ------------------------------- * * $Id: i4b_l2.c,v 1.24 2008/07/20 01:05:27 martin Exp $ * * $FreeBSD$ * * last edit-date: [Fri Jan 5 11:33:47 2001] * *---------------------------------------------------------------------------*/ #include __KERNEL_RCSID(0, "$NetBSD: i4b_l2.c,v 1.24 2008/07/20 01:05:27 martin Exp $"); #ifdef __FreeBSD__ #include "i4bq921.h" #else #define NI4BQ921 1 #endif #if NI4BQ921 > 0 #include #include #include #include #include #include #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000 #include #endif #ifdef __FreeBSD__ #include #include #else #include #include #endif #include #include #include #include #include #include #include /* this layers debug level */ unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT; /*---------------------------------------------------------------------------* * DL_ESTABLISH_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_establish_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv) { NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif); i4b_l1_activate(l2sc); i4b_next_l2state(l2sc, drv, EV_DLESTRQ); return(0); } /*---------------------------------------------------------------------------* * DL_RELEASE_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_release_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv) { NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif); i4b_next_l2state(l2sc, drv, EV_DLRELRQ); return(0); } /*---------------------------------------------------------------------------* * DL UNIT DATA REQUEST from Layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_unit_data_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m) { #ifdef NOTDEF NDBGL2(L2_PRIM, "isdnif %d", l2sc->isdnif); #endif return(0); } /*---------------------------------------------------------------------------* * DL DATA REQUEST from Layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_data_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m) { switch(l2sc->Q921_state) { case ST_AW_EST: case ST_MULTIFR: case ST_TIMREC: if(IF_QFULL(&l2sc->i_queue)) { NDBGL2(L2_ERROR, "i_queue full!!"); i4b_Dfreembuf(m); } else { int s; s = splnet(); IF_ENQUEUE(&l2sc->i_queue, m); splx(s); i4b_i_frame_queued_up(l2sc); } break; default: NDBGL2(L2_ERROR, "isdnif %d ERROR in state [%s], freeing mbuf", l2sc->drv->isdnif, i4b_print_l2state(l2sc)); i4b_Dfreembuf(m); break; } return(0); } /*---------------------------------------------------------------------------* * isdn_layer2_activate_ind - link activation/deactivation indication from layer 1 *---------------------------------------------------------------------------*/ int isdn_layer2_activate_ind(struct l2_softc *l2sc, struct isdn_l3_driver *drv, int event_activate) { if (event_activate) { l2sc->ph_active = PH_ACTIVE; } else { l2sc->ph_active = PH_INACTIVE; } return(0); } /*---------------------------------------------------------------------------* * i4b_l2_unit_init - place layer 2 unit into known state *---------------------------------------------------------------------------*/ static void i4b_l2_unit_init(l2_softc_t *l2sc) { int s; s = splnet(); l2sc->Q921_state = ST_TEI_UNAS; l2sc->tei_valid = TEI_INVALID; l2sc->vr = 0; l2sc->vs = 0; l2sc->va = 0; l2sc->ack_pend = 0; l2sc->rej_excpt = 0; l2sc->peer_busy = 0; l2sc->own_busy = 0; l2sc->l3initiated = 0; l2sc->rxd_CR = 0; l2sc->rxd_PF = 0; l2sc->rxd_NR = 0; l2sc->RC = 0; l2sc->iframe_sent = 0; l2sc->postfsmfunc = NULL; if(l2sc->ua_num != UA_EMPTY) { i4b_Dfreembuf(l2sc->ua_frame); l2sc->ua_num = UA_EMPTY; l2sc->ua_frame = NULL; } i4b_T200_stop(l2sc); i4b_T202_stop(l2sc); i4b_T203_stop(l2sc); splx(s); } /*---------------------------------------------------------------------------* * isdn_layer2_status_ind - status indication upward *---------------------------------------------------------------------------*/ int isdn_layer2_status_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, int status, int parm) { int s; int sendup = 1; s = splnet(); NDBGL2(L2_PRIM, "isdnif %d, status=%d, parm=%d", l2sc->drv->isdnif, status, parm); switch(status) { case STI_ATTACH: if (parm == 0) { /* detach */ callout_stop(&l2sc->T200_callout); callout_stop(&l2sc->T202_callout); callout_stop(&l2sc->T203_callout); callout_stop(&l2sc->IFQU_callout); break; } l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN; l2sc->ua_frame = NULL; memset(&l2sc->stat, 0, sizeof(lapdstat_t)); /* initialize the callout handles for timeout routines */ callout_init(&l2sc->T200_callout, 0); callout_init(&l2sc->T202_callout, 0); callout_init(&l2sc->T203_callout, 0); callout_init(&l2sc->IFQU_callout, 0); i4b_l2_unit_init(l2sc); break; case STI_L1STAT: /* state of layer 1 */ break; case STI_PDEACT: /* Timer 4 expired */ /*XXX*/ if((l2sc->Q921_state >= ST_AW_EST) && (l2sc->Q921_state <= ST_TIMREC)) { NDBGL2(L2_ERROR, "isdnif %d, persistent deactivation!", l2sc->drv->isdnif); i4b_l2_unit_init(l2sc); parm = -1; /* this is passed as the new * TEI to upper layers */ } else { sendup = 0; } break; case STI_NOL1ACC: i4b_l2_unit_init(l2sc); NDBGL2(L2_ERROR, "isdnif %d, cannot access S0 bus!", l2sc->drv->isdnif); break; default: NDBGL2(L2_ERROR, "ERROR, isdnif %d, unknown status message!", l2sc->drv->isdnif); break; } if(sendup) i4b_mdl_status_ind(l2sc->drv, status, parm); /* send up to layer 3 */ splx(s); return(0); } /*---------------------------------------------------------------------------* * MDL_COMMAND_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_mdl_command_req(struct isdn_l3_driver *drv, int command, void *parm) { struct l2_softc *sc = (l2_softc_t*)drv->l1_token; NDBGL2(L2_PRIM, "isdnif %d, command=%d, parm=%p", drv->isdnif, command, parm); switch(command) { case CMR_DOPEN: i4b_l2_unit_init(sc); /* XXX - enable interrupts */ break; case CMR_DCLOSE: /* XXX - disable interrupts */ break; } /* pass down to layer 1 driver */ if (sc->driver) sc->driver->mph_command_req(sc->l1_token, command, parm); return(0); } /*---------------------------------------------------------------------------* * isdn_layer2_data_ind - process a rx'd frame got from layer 1 *---------------------------------------------------------------------------*/ int isdn_layer2_data_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m) { u_char *ptr = m->m_data; if ( (*(ptr + OFF_CNTL) & 0x01) == 0 ) { if(m->m_len < 4) /* 6 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; NDBGL2(L2_ERROR, "ERROR, I-frame < 6 octetts!"); i4b_Dfreembuf(m); return(0); } i4b_rxd_i_frame(l2sc, drv, m); } else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 ) { if(m->m_len < 4) /* 6 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; NDBGL2(L2_ERROR, "ERROR, S-frame < 6 octetts!"); i4b_Dfreembuf(m); return(0); } i4b_rxd_s_frame(l2sc, drv, m); } else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 ) { if(m->m_len < 3) /* 5 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; NDBGL2(L2_ERROR, "ERROR, U-frame < 5 octetts!"); i4b_Dfreembuf(m); return(0); } i4b_rxd_u_frame(l2sc, drv, m); } else { l2sc->stat.err_rx_badf++; NDBGL2(L2_ERROR, "ERROR, bad frame rx'd - "); i4b_print_frame(m->m_len, m->m_data); i4b_Dfreembuf(m); } return(0); } int i4b_l2_channel_get_state(struct isdn_l3_driver *drv, int b_chanid) { l2_softc_t *sc = drv->l1_token; return sc->bchan_state[b_chanid]; } void i4b_l2_channel_set_state(struct isdn_l3_driver *drv, int b_chanid, int state) { l2_softc_t *sc = drv->l1_token; sc->bchan_state[b_chanid] = state; } /*---------------------------------------------------------------------------* * telephony silence detection *---------------------------------------------------------------------------*/ #define TEL_IDLE_MIN (BCH_MAX_DATALEN/2) int isdn_bchan_silence(unsigned char *data, int len) { register int i = 0; register int j = 0; /* count idle bytes */ for(;i < len; i++) { if((*data >= 0xaa) && (*data <= 0xac)) j++; data++; } #ifdef NOTDEF printf("isic_hscx_silence: got %d silence bytes in frame\n", j); #endif if(j < (TEL_IDLE_MIN)) return(0); else return(1); } #endif /* NI4BQ921 > 0 */