385 lines
9.9 KiB
C
385 lines
9.9 KiB
C
/*
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* Copyright (c) 1997, 2002 Hellmuth Michaelis. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*---------------------------------------------------------------------------
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*
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* i4b_l2.c - ISDN layer 2 (Q.921)
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* -------------------------------
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*
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* $FreeBSD$
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*
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* last edit-date: [Sat Mar 9 16:11:14 2002]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <machine/i4b_debug.h>
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#include <i4b/include/i4b_l1l2.h>
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#include <i4b/include/i4b_l2l3.h>
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#include <i4b/include/i4b_mbuf.h>
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#include <i4b/include/i4b_global.h>
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#include <i4b/layer2/i4b_l2.h>
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#include <i4b/layer2/i4b_l2fsm.h>
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int i4b_dl_establish_ind(int);
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int i4b_dl_establish_cnf(int);
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int i4b_dl_release_ind(int);
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int i4b_dl_release_cnf(int);
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int i4b_dl_data_ind(int, struct mbuf *);
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int i4b_dl_unit_data_ind(int, struct mbuf *);
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static int i4b_mdl_command_req(int, int, void *);
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/* from layer 2 */
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extern int i4b_mdl_status_ind(int, int, int);
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/* this layers debug level */
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unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT;
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struct i4b_l2l3_func i4b_l2l3_func = {
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/* Layer 2 --> Layer 3 */
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(int (*)(int)) i4b_dl_establish_ind,
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(int (*)(int)) i4b_dl_establish_cnf,
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(int (*)(int)) i4b_dl_release_ind,
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(int (*)(int)) i4b_dl_release_cnf,
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(int (*)(int, struct mbuf *)) i4b_dl_data_ind,
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(int (*)(int, struct mbuf *)) i4b_dl_unit_data_ind,
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/* Layer 3 --> Layer 2 */
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(int (*)(int)) i4b_dl_establish_req,
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(int (*)(int)) i4b_dl_release_req,
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(int (*)(int, struct mbuf *)) i4b_dl_data_req,
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(int (*)(int, struct mbuf *)) i4b_dl_unit_data_req,
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/* Layer 2 --> Layer 3 management */
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(int (*)(int, int, int)) i4b_mdl_status_ind,
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/* Layer 3 --> Layer 2 management */
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(int (*)(int, int, void *)) i4b_mdl_command_req
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};
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/*---------------------------------------------------------------------------*
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* DL_ESTABLISH_REQ from layer 3
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*---------------------------------------------------------------------------*/
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int i4b_dl_establish_req(int unit)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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NDBGL2(L2_PRIM, "unit %d",unit);
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i4b_l1_activate(l2sc);
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i4b_next_l2state(l2sc, EV_DLESTRQ);
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* DL_RELEASE_REQ from layer 3
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*---------------------------------------------------------------------------*/
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int i4b_dl_release_req(int unit)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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NDBGL2(L2_PRIM, "unit %d",unit);
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i4b_next_l2state(l2sc, EV_DLRELRQ);
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* DL UNIT DATA REQUEST from Layer 3
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*---------------------------------------------------------------------------*/
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int i4b_dl_unit_data_req(int unit, struct mbuf *m)
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{
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#ifdef NOTDEF
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NDBGL2(L2_PRIM, "unit %d",unit);
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#endif
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* DL DATA REQUEST from Layer 3
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*---------------------------------------------------------------------------*/
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int i4b_dl_data_req(int unit, struct mbuf *m)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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#ifdef NOTDEF
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NDBGL2(L2_PRIM, "unit %d",unit);
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#endif
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switch(l2sc->Q921_state)
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{
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case ST_AW_EST:
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case ST_MULTIFR:
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case ST_TIMREC:
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if(_IF_QFULL(&l2sc->i_queue))
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{
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NDBGL2(L2_ERROR, "i_queue full!!");
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i4b_Dfreembuf(m);
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}
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else
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{
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CRIT_VAR;
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CRIT_BEG;
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IF_ENQUEUE(&l2sc->i_queue, m);
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CRIT_END;
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i4b_i_frame_queued_up(l2sc);
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}
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break;
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default:
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NDBGL2(L2_ERROR, "unit %d ERROR in state [%s], freeing mbuf", unit, i4b_print_l2state(l2sc));
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i4b_Dfreembuf(m);
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break;
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}
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* i4b_ph_activate_ind - link activation indication from layer 1
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*---------------------------------------------------------------------------*/
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int
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i4b_ph_activate_ind(int unit)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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NDBGL1(L1_PRIM, "unit %d",unit);
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l2sc->ph_active = PH_ACTIVE;
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* i4b_ph_deactivate_ind - link deactivation indication from layer 1
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*---------------------------------------------------------------------------*/
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int
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i4b_ph_deactivate_ind(int unit)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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NDBGL1(L1_PRIM, "unit %d",unit);
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l2sc->ph_active = PH_INACTIVE;
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* i4b_l2_unit_init - place layer 2 unit into known state
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*---------------------------------------------------------------------------*/
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static void
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i4b_l2_unit_init(int unit)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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CRIT_VAR;
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CRIT_BEG;
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l2sc->Q921_state = ST_TEI_UNAS;
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l2sc->tei_valid = TEI_INVALID;
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l2sc->vr = 0;
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l2sc->vs = 0;
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l2sc->va = 0;
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l2sc->ack_pend = 0;
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l2sc->rej_excpt = 0;
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l2sc->peer_busy = 0;
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l2sc->own_busy = 0;
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l2sc->l3initiated = 0;
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l2sc->rxd_CR = 0;
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l2sc->rxd_PF = 0;
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l2sc->rxd_NR = 0;
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l2sc->RC = 0;
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l2sc->iframe_sent = 0;
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l2sc->postfsmfunc = NULL;
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if(l2sc->ua_num != UA_EMPTY)
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{
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i4b_Dfreembuf(l2sc->ua_frame);
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l2sc->ua_num = UA_EMPTY;
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l2sc->ua_frame = NULL;
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}
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i4b_T200_stop(l2sc);
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i4b_T202_stop(l2sc);
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i4b_T203_stop(l2sc);
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CRIT_END;
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}
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/*---------------------------------------------------------------------------*
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* i4b_mph_status_ind - status indication upward
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*---------------------------------------------------------------------------*/
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int
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i4b_mph_status_ind(int unit, int status, int parm)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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CRIT_VAR;
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int sendup = 1;
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CRIT_BEG;
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NDBGL1(L1_PRIM, "unit %d, status=%d, parm=%d", unit, status, parm);
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switch(status)
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{
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case STI_ATTACH:
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l2sc->unit = unit;
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l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
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if(!mtx_initialized(&l2sc->i_queue.ifq_mtx))
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mtx_init(&l2sc->i_queue.ifq_mtx, "i4b_l2sc", NULL, MTX_DEF);
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l2sc->ua_frame = NULL;
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bzero(&l2sc->stat, sizeof(lapdstat_t));
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i4b_l2_unit_init(unit);
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/* initialize the callout handles for timeout routines */
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callout_handle_init(&l2sc->T200_callout);
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callout_handle_init(&l2sc->T202_callout);
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callout_handle_init(&l2sc->T203_callout);
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callout_handle_init(&l2sc->IFQU_callout);
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break;
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case STI_L1STAT: /* state of layer 1 */
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break;
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case STI_PDEACT: /* Timer 4 expired */
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/*XXX*/ if((l2sc->Q921_state >= ST_AW_EST) &&
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(l2sc->Q921_state <= ST_TIMREC))
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{
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NDBGL2(L2_ERROR, "unit %d, persistent deactivation!", unit);
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i4b_l2_unit_init(unit);
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}
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else
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{
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sendup = 0;
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}
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break;
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case STI_NOL1ACC:
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i4b_l2_unit_init(unit);
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NDBGL2(L2_ERROR, "unit %d, cannot access S0 bus!", unit);
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break;
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default:
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NDBGL2(L2_ERROR, "ERROR, unit %d, unknown status message!", unit);
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break;
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}
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if(sendup)
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MDL_Status_Ind(unit, status, parm); /* send up to layer 3 */
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CRIT_END;
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* MDL_COMMAND_REQ from layer 3
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*---------------------------------------------------------------------------*/
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static int
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i4b_mdl_command_req(int unit, int command, void * parm)
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{
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NDBGL2(L2_PRIM, "unit %d, command=%d, parm=%d", unit, command, (unsigned int)parm);
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switch(command)
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{
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case CMR_DOPEN:
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i4b_l2_unit_init(unit);
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break;
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}
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MPH_Command_Req(unit, command, parm);
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* i4b_ph_data_ind - process a rx'd frame got from layer 1
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*---------------------------------------------------------------------------*/
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int
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i4b_ph_data_ind(int unit, struct mbuf *m)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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#ifdef NOTDEF
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NDBGL1(L1_PRIM, "unit %d", unit);
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#endif
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u_char *ptr = m->m_data;
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if ( (*(ptr + OFF_CNTL) & 0x01) == 0 )
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{
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if(m->m_len < 4) /* 6 oct - 2 chksum oct */
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{
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l2sc->stat.err_rx_len++;
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NDBGL2(L2_ERROR, "ERROR, I-frame < 6 octetts!");
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i4b_Dfreembuf(m);
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return(0);
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}
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i4b_rxd_i_frame(unit, m);
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}
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else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 )
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{
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if(m->m_len < 4) /* 6 oct - 2 chksum oct */
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{
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l2sc->stat.err_rx_len++;
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NDBGL2(L2_ERROR, "ERROR, S-frame < 6 octetts!");
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i4b_Dfreembuf(m);
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return(0);
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}
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i4b_rxd_s_frame(unit, m);
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}
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else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 )
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{
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if(m->m_len < 3) /* 5 oct - 2 chksum oct */
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{
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l2sc->stat.err_rx_len++;
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NDBGL2(L2_ERROR, "ERROR, U-frame < 5 octetts!");
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i4b_Dfreembuf(m);
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return(0);
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}
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i4b_rxd_u_frame(unit, m);
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}
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else
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{
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l2sc->stat.err_rx_badf++;
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NDBGL2(L2_ERROR, "ERROR, bad frame rx'd - ");
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i4b_print_frame(m->m_len, m->m_data);
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i4b_Dfreembuf(m);
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}
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return(0);
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}
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