FreeBSD-5.3/sys/i4b/layer2/i4b_l2.c
/*
* Copyright (c) 1997, 2002 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)
* -------------------------------
* last edit-date: [Sat Mar 9 16:11:14 2002]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/i4b/layer2/i4b_l2.c,v 1.19 2003/06/10 23:55:01 obrien Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <machine/i4b_debug.h>
#include <i4b/include/i4b_l1l2.h>
#include <i4b/include/i4b_l2l3.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, void *);
/* from layer 2 */
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, void *)) i4b_mdl_command_req
};
/*---------------------------------------------------------------------------*
* DL_ESTABLISH_REQ from layer 3
*---------------------------------------------------------------------------*/
int i4b_dl_establish_req(int unit)
{
l2_softc_t *l2sc = &l2_softc[unit];
NDBGL2(L2_PRIM, "unit %d",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];
NDBGL2(L2_PRIM, "unit %d",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
NDBGL2(L2_PRIM, "unit %d",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];
#ifdef NOTDEF
NDBGL2(L2_PRIM, "unit %d",unit);
#endif
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
{
CRIT_VAR;
CRIT_BEG;
IF_ENQUEUE(&l2sc->i_queue, m);
CRIT_END;
i4b_i_frame_queued_up(l2sc);
}
break;
default:
NDBGL2(L2_ERROR, "unit %d ERROR in state [%s], freeing mbuf", 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];
NDBGL1(L1_PRIM, "unit %d",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];
NDBGL1(L1_PRIM, "unit %d",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];
CRIT_VAR;
CRIT_BEG;
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);
CRIT_END;
}
/*---------------------------------------------------------------------------*
* 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];
CRIT_VAR;
int sendup = 1;
CRIT_BEG;
NDBGL1(L1_PRIM, "unit %d, status=%d, parm=%d", unit, status, parm);
switch(status)
{
case STI_ATTACH:
l2sc->unit = unit;
l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
if(!mtx_initialized(&l2sc->i_queue.ifq_mtx))
mtx_init(&l2sc->i_queue.ifq_mtx, "i4b_l2sc", NULL, MTX_DEF);
l2sc->ua_frame = NULL;
bzero(&l2sc->stat, sizeof(lapdstat_t));
i4b_l2_unit_init(unit);
/* 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);
callout_handle_init(&l2sc->IFQU_callout);
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, "unit %d, persistent deactivation!", unit);
i4b_l2_unit_init(unit);
}
else
{
sendup = 0;
}
break;
case STI_NOL1ACC:
i4b_l2_unit_init(unit);
NDBGL2(L2_ERROR, "unit %d, cannot access S0 bus!", unit);
break;
default:
NDBGL2(L2_ERROR, "ERROR, unit %d, unknown status message!", unit);
break;
}
if(sendup)
MDL_Status_Ind(unit, status, parm); /* send up to layer 3 */
CRIT_END;
return(0);
}
/*---------------------------------------------------------------------------*
* MDL_COMMAND_REQ from layer 3
*---------------------------------------------------------------------------*/
static int
i4b_mdl_command_req(int unit, int command, void * parm)
{
NDBGL2(L2_PRIM, "unit %d, command=%d, parm=%d", unit, command, (unsigned int)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)
{
l2_softc_t *l2sc = &l2_softc[unit];
#ifdef NOTDEF
NDBGL1(L1_PRIM, "unit %d", unit);
#endif
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(unit, 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(unit, 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(unit, 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);
}