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NetBSD/sys/netisdn/i4b_l2.c

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/* $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 <sys/cdefs.h>
__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 <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
#include <sys/callout.h>
#endif
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#endif
#include <netisdn/i4b_l3l4.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_l2fsm.h>
/* 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 */
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