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19c749625f
freebsd/sys/i4b/layer2/i4b_l2.c
Poul-Henning Kamp 19c749625f Initial entry of ISDN4BSD into the FreeBSD tree. 
ISDN4BSD is the work of our brand-new comitter: Hellmuth Michaelis,
who has done a tremendous amount of work to bring us this far.

There are still some outstanding issues and files to bring into
the tree, and for now it will be needed to pick up all the extra
docs from the isdn4bsd release.

It is probably also a very good idea to subscribe to the isdn@freebsd.org
mailing list before you try this out.

These files correspond to release "beta Version 0.70.00 / December
1998" from Hellmuth.
1998-12-27 21:47:14 +00:00

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/*
* Copyright (c) 1997, 1998 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 1.23 1998/12/05 18:05:08 hm Exp $
*
* last edit-date: [Sat Dec 5 18:27:00 1998]
*
*---------------------------------------------------------------------------*/
#ifdef __FreeBSD__
#include "i4bq921.h"
#else
#define NI4BQ921 1
#endif
#if NI4BQ921 > 0
#include <sys/param.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <sys/ioccom.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <i4b/i4b_debug.h>
#include <i4b/i4b_ioctl.h>
#endif
#include <i4b/include/i4b_l1l2.h>
#include <i4b/include/i4b_l2l3.h>
#include <i4b/include/i4b_isdnq931.h>
#include <i4b/include/i4b_mbuf.h>
#include <i4b/include/i4b_global.h>
#include <i4b/layer2/i4b_l2.h>
#include <i4b/layer2/i4b_l2fsm.h>
int i4b_dl_establish_ind(int);
int i4b_dl_establish_cnf(int);
int i4b_dl_release_ind(int);
int i4b_dl_release_cnf(int);
int i4b_dl_data_ind(int, struct mbuf *);
int i4b_dl_unit_data_ind(int, struct mbuf *);
static int i4b_mdl_command_req(int, int, int);
/* from layer 2 */
extern int i4b_mdl_attach_ind(int, int);
extern int i4b_mdl_status_ind(int, int, int);
/* this layers debug level */
unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT;
struct i4b_l2l3_func i4b_l2l3_func = {
/* Layer 2 --> Layer 3 */
(int (*)(int)) i4b_dl_establish_ind,
(int (*)(int)) i4b_dl_establish_cnf,
(int (*)(int)) i4b_dl_release_ind,
(int (*)(int)) i4b_dl_release_cnf,
(int (*)(int, struct mbuf *)) i4b_dl_data_ind,
(int (*)(int, struct mbuf *)) i4b_dl_unit_data_ind,
/* Layer 3 --> Layer 2 */
(int (*)(int)) i4b_dl_establish_req,
(int (*)(int)) i4b_dl_release_req,
(int (*)(int, struct mbuf *)) i4b_dl_data_req,
(int (*)(int, struct mbuf *)) i4b_dl_unit_data_req,
/* Layer 2 --> Layer 3 management */
(int (*)(int, int, int)) i4b_mdl_status_ind,
/* Layer 3 --> Layer 2 management */
(int (*)(int, int, int)) i4b_mdl_command_req
};
/*---------------------------------------------------------------------------*
* DL_ESTABLISH_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_establish_req(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
DBGL2(L2_PRIM, "DL-ESTABLISH-REQ", ("unit %d\n",unit));
i4b_l1_activate(l2sc);
i4b_next_l2state(l2sc, EV_DLESTRQ);
return(0);
}
/*---------------------------------------------------------------------------*
* DL_RELEASE_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_release_req(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
DBGL2(L2_PRIM, "DL-RELEASE-REQ", ("unit %d\n",unit));
i4b_next_l2state(l2sc, EV_DLRELRQ);
return(0);
}
/*---------------------------------------------------------------------------*
* DL UNIT DATA REQUEST from Layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_unit_data_req(int unit, struct mbuf *m)
{
#ifdef NOTDEF
DBGL2(L2_PRIM, "DL-UNIT-DATA-REQ", ("unit %d\n",unit));
#endif
return(0);
}
/*---------------------------------------------------------------------------*
* DL DATA REQUEST from Layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_data_req(int unit, struct mbuf *m)
{
l2_softc_t *l2sc = &l2_softc[unit];
int x;
#ifdef NOTDEF
DBGL2(L2_PRIM, "DL-DATA-REQ", ("unit %d\n",unit));
#endif
switch(l2sc->Q921_state)
{
case ST_AW_EST:
case ST_MULTIFR:
case ST_TIMREC:
if(IF_QFULL(&l2sc->i_queue))
{
DBGL2(L2_ERROR, "i4b_dl_data_req", ("i_queue full!!\n"));
i4b_Dfreembuf(m);
}
else
{
x = splimp();
IF_ENQUEUE(&l2sc->i_queue, m);
splx(x);
i4b_i_frame_queued_up(l2sc);
}
break;
default:
DBGL2(L2_ERROR, "i4b_dl_data_req", ("unit %d ERROR in state [%s], freeing mbuf\n", unit, i4b_print_l2state(l2sc)));
i4b_Dfreembuf(m);
break;
}
return(0);
}
/*---------------------------------------------------------------------------*
* i4b_ph_activate_ind - link activation indication from layer 1
*---------------------------------------------------------------------------*/
int
i4b_ph_activate_ind(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
DBGL1(L1_PRIM, "PH-ACTIVATE-IND", ("unit %d\n",unit));
l2sc->ph_active = PH_ACTIVE;
return(0);
}
/*---------------------------------------------------------------------------*
* i4b_ph_deactivate_ind - link deactivation indication from layer 1
*---------------------------------------------------------------------------*/
int
i4b_ph_deactivate_ind(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
DBGL1(L1_PRIM, "PH-DEACTIVATE-IND", ("unit %d\n",unit));
l2sc->ph_active = PH_INACTIVE;
return(0);
}
/*---------------------------------------------------------------------------*
* i4b_l2_unit_init - place layer 2 unit into known state
*---------------------------------------------------------------------------*/
static void
i4b_l2_unit_init(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
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);
}
/*---------------------------------------------------------------------------*
* i4b_mph_status_ind - status indication upward
*---------------------------------------------------------------------------*/
int
i4b_mph_status_ind(int unit, int status, int parm)
{
l2_softc_t *l2sc = &l2_softc[unit];
int sendup = 1;
int x = SPLI4B();
DBGL1(L1_PRIM, "MPH-STATUS-IND", ("unit %d, status=%d, parm=%d\n", unit, status, parm));
switch(status)
{
case STI_ATTACH:
l2sc->unit = unit;
l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
l2sc->ua_frame = NULL;
i4b_l2_unit_init(unit);
#if defined(__FreeBSD_version) && __FreeBSD_version >= 300001
/* initialize the callout handles for timeout routines */
callout_handle_init(&l2sc->T200_callout);
callout_handle_init(&l2sc->T202_callout);
callout_handle_init(&l2sc->T203_callout);
#endif
break;
case STI_L1STAT: /* state of layer 1 */
break;
case STI_PDEACT: /* Timer 4 expired */
if((l2sc->Q921_state >= ST_AW_EST) &&
(l2sc->Q921_state <= ST_TIMREC))
{
DBGL2(L2_ERROR, "i4b_mph_status_ind", ("unit %d, persistent deactivation!\n", unit));
i4b_l2_unit_init(unit);
}
else
{
sendup = 0;
}
break;
case STI_NOL1ACC:
i4b_l2_unit_init(unit);
DBGL2(L2_ERROR, "i4b_mph_status_ind", ("unit %d, cannot access S0 bus!\n", unit));
break;
default:
DBGL2(L2_ERROR, "i4b_mph_status_ind", ("ERROR, unit %d, unknown status message!\n", unit));
break;
}
if(sendup)
MDL_Status_Ind(unit, status, parm); /* send up to layer 3 */
splx(x);
return(0);
}
/*---------------------------------------------------------------------------*
* MDL_COMMAND_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_mdl_command_req(int unit, int command, int parm)
{
DBGL2(L2_PRIM, "MDL-COMMAND-REQ", ("unit %d, command=%d, parm=%d\n", unit, command, parm));
switch(command)
{
case CMR_DOPEN:
i4b_l2_unit_init(unit);
break;
}
MPH_Command_Req(unit, command, parm);
return(0);
}
/*---------------------------------------------------------------------------*
* i4b_ph_data_ind - process a rx'd frame got from layer 1
*---------------------------------------------------------------------------*/
int
i4b_ph_data_ind(int unit, struct mbuf *m)
{
#ifdef NOTDEF
DBGL1(L1_PRIM, "PH-DATA-IND", ("unit %d\n", unit));
#endif
u_char *ptr = m->m_data;
if ( (*(ptr + OFF_CNTL) & 0x01) == 0 )
{
if(m->m_len < 4) /* 6 oct - 2 chksum oct */
{
DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, I-frame < 6 octetts!\n"));
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_i_frame(unit, m);
}
else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 )
{
if(m->m_len < 4) /* 6 oct - 2 chksum oct */
{
DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, S-frame < 6 octetts!\n"));
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_s_frame(unit, m);
}
else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 )
{
if(m->m_len < 3) /* 5 oct - 2 chksum oct */
{
DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, U-frame < 5 octetts!\n"));
i4b_Dfreembuf(m);
return(0);
}
i4b_rxd_u_frame(unit, m);
}
else
{
DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, bad frame rx'd - "));
i4b_print_frame(m->m_len, m->m_data);
i4b_Dfreembuf(m);
}
return(0);
}
#endif /* NI4BQ921 > 0 */
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