142c2a33ba
by Slava Semushin <slava.semushin@gmail.com>. To verify that no nasty side effects of duplicate includes (or their removal) have an effect here, I've compiled an i386/ALL kernel with and without the patch, and the only difference in the resulting .o files was in shifted line numbers in some assert() calls. The comparison of the .o files was based on the output of "objdump -D". Thanks to martin@ for the input on testing.
404 lines
10 KiB
C
404 lines
10 KiB
C
/* $NetBSD: i4b_l2.c,v 1.21 2007/01/24 13:08:15 hubertf Exp $ */
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/*
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* Copyright (c) 1997, 2000 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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* $Id: i4b_l2.c,v 1.21 2007/01/24 13:08:15 hubertf Exp $
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*
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* $FreeBSD$
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*
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* last edit-date: [Fri Jan 5 11:33:47 2001]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: i4b_l2.c,v 1.21 2007/01/24 13:08:15 hubertf Exp $");
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#ifdef __FreeBSD__
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#include "i4bq921.h"
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#else
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#define NI4BQ921 1
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#endif
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#if NI4BQ921 > 0
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#include <sys/param.h>
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#include <sys/kernel.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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#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
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#include <sys/callout.h>
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#endif
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#ifdef __FreeBSD__
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#include <machine/i4b_debug.h>
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#include <machine/i4b_ioctl.h>
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#else
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#include <netisdn/i4b_debug.h>
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#include <netisdn/i4b_ioctl.h>
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#endif
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#include <netisdn/i4b_l3l4.h>
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#include <netisdn/i4b_l2.h>
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#include <netisdn/i4b_l1l2.h>
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#include <netisdn/i4b_isdnq931.h>
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#include <netisdn/i4b_mbuf.h>
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#include <netisdn/i4b_global.h>
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#include <netisdn/i4b_l2fsm.h>
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/* this layers debug level */
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unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT;
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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(l2_softc_t *l2sc, struct isdn_l3_driver *drv)
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{
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NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif);
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i4b_l1_activate(l2sc);
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i4b_next_l2state(l2sc, drv, 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(l2_softc_t *l2sc, struct isdn_l3_driver *drv)
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{
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NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif);
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i4b_next_l2state(l2sc, drv, 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(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
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{
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#ifdef NOTDEF
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NDBGL2(L2_PRIM, "isdnif %d", l2sc->isdnif);
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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(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
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{
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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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int s;
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s = splnet();
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IF_ENQUEUE(&l2sc->i_queue, m);
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splx(s);
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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, "isdnif %d ERROR in state [%s], freeing mbuf", l2sc->drv->isdnif, 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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* isdn_layer2_activate_ind - link activation/deactivation indication from layer 1
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*---------------------------------------------------------------------------*/
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int
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isdn_layer2_activate_ind(struct l2_softc *l2sc, struct isdn_l3_driver *drv, int event_activate)
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{
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if (event_activate) {
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l2sc->ph_active = PH_ACTIVE;
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} else {
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l2sc->ph_active = PH_INACTIVE;
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}
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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(l2_softc_t *l2sc)
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{
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int s;
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s = splnet();
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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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splx(s);
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}
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/*---------------------------------------------------------------------------*
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* isdn_layer2_status_ind - status indication upward
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*---------------------------------------------------------------------------*/
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int
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isdn_layer2_status_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, int status, int parm)
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{
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int s;
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int sendup = 1;
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s = splnet();
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NDBGL2(L2_PRIM, "isdnif %d, status=%d, parm=%d", l2sc->drv->isdnif, status, parm);
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switch(status)
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{
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case STI_ATTACH:
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if (parm == 0) {
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/* detach */
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callout_stop(&l2sc->T200_callout);
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callout_stop(&l2sc->T202_callout);
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callout_stop(&l2sc->T203_callout);
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callout_stop(&l2sc->IFQU_callout);
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break;
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}
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l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
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l2sc->ua_frame = NULL;
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memset(&l2sc->stat, 0, sizeof(lapdstat_t));
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i4b_l2_unit_init(l2sc);
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/* initialize the callout handles for timeout routines */
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callout_init(&l2sc->T200_callout);
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callout_init(&l2sc->T202_callout);
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callout_init(&l2sc->T203_callout);
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callout_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, "isdnif %d, persistent deactivation!", l2sc->drv->isdnif);
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i4b_l2_unit_init(l2sc);
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parm = -1; /* this is passed as the new
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* TEI to upper layers */
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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(l2sc);
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NDBGL2(L2_ERROR, "isdnif %d, cannot access S0 bus!", l2sc->drv->isdnif);
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break;
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default:
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NDBGL2(L2_ERROR, "ERROR, isdnif %d, unknown status message!", l2sc->drv->isdnif);
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break;
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}
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if(sendup)
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i4b_mdl_status_ind(l2sc->drv, status, parm); /* send up to layer 3 */
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splx(s);
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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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int i4b_mdl_command_req(struct isdn_l3_driver *drv, int command, void * parm)
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{
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struct l2_softc *sc = (l2_softc_t*)drv->l1_token;
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NDBGL2(L2_PRIM, "isdnif %d, command=%d, parm=%p", drv->isdnif, command, 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(sc);
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/* XXX - enable interrupts */
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break;
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case CMR_DCLOSE:
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/* XXX - disable interrupts */
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break;
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}
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/* pass down to layer 1 driver */
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if (sc->driver)
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sc->driver->mph_command_req(sc->l1_token, command, parm);
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return(0);
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}
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/*---------------------------------------------------------------------------*
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* isdn_layer2_data_ind - process a rx'd frame got from layer 1
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*---------------------------------------------------------------------------*/
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int
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isdn_layer2_data_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
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{
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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(l2sc, drv, 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(l2sc, drv, 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(l2sc, drv, 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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int i4b_l2_channel_get_state(struct isdn_l3_driver *drv, int b_chanid)
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{
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l2_softc_t *sc = drv->l1_token;
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return sc->bchan_state[b_chanid];
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}
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void i4b_l2_channel_set_state(struct isdn_l3_driver *drv, int b_chanid, int state)
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{
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l2_softc_t *sc = drv->l1_token;
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sc->bchan_state[b_chanid] = state;
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}
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/*---------------------------------------------------------------------------*
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* telephony silence detection
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*---------------------------------------------------------------------------*/
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#define TEL_IDLE_MIN (BCH_MAX_DATALEN/2)
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int
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isdn_bchan_silence(unsigned char *data, int len)
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{
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register int i = 0;
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register int j = 0;
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/* count idle bytes */
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for(;i < len; i++)
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{
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if((*data >= 0xaa) && (*data <= 0xac))
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j++;
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data++;
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}
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#ifdef NOTDEF
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printf("isic_hscx_silence: got %d silence bytes in frame\n", j);
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#endif
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if(j < (TEL_IDLE_MIN))
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return(0);
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else
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return(1);
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}
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#endif /* NI4BQ921 > 0 */
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