324 lines
9.1 KiB
C
324 lines
9.1 KiB
C
/*
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* Copyright (c) 1997, 1999 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_tei.c - tei handling procedures
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* -----------------------------------
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*
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* $Id: i4b_tei.c,v 1.15 1999/05/28 15:03:32 hm Exp $
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*
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* last edit-date: [Fri May 28 16:14:14 1999]
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*
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*---------------------------------------------------------------------------*/
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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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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <sys/ioccom.h>
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#else
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#include <sys/ioctl.h>
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#endif
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/syslog.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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#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 <i4b/i4b_debug.h>
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#include <i4b/i4b_ioctl.h>
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#endif
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <machine/random.h>
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#endif
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#include <i4b/include/i4b_global.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_isdnq931.h>
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#include <i4b/include/i4b_mbuf.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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/*---------------------------------------------------------------------------*
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* handle a received TEI management frame
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*---------------------------------------------------------------------------*/
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void
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i4b_tei_rxframe(int unit, struct mbuf *m)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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u_char *ptr = m->m_data;
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switch(*(ptr + OFF_MT))
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{
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case MT_ID_ASSIGN:
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if( (*(ptr + OFF_RIL) == l2sc->last_ril) &&
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(*(ptr + OFF_RIH) == l2sc->last_rih))
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{
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l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
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l2sc->tei_valid = TEI_VALID;
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if(l2sc->T202 == TIMER_ACTIVE)
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i4b_T202_stop(l2sc);
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MDL_Status_Ind(l2sc->unit, STI_TEIASG, l2sc->tei);
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log(LOG_INFO, "i4b: unit %d, assigned TEI = %d = 0x%02x\n", l2sc->unit, l2sc->tei, l2sc->tei);
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DBGL2(L2_TEI_MSG, "i4b_tei_rx_frame", ("TEI ID Assign - TEI = %d\n", l2sc->tei));
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i4b_next_l2state(l2sc, EV_MDASGRQ);
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}
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break;
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case MT_ID_DENY:
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if( (*(ptr + OFF_RIL) == l2sc->last_ril) &&
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(*(ptr + OFF_RIH) == l2sc->last_rih))
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{
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l2sc->tei_valid = TEI_INVALID;
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l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
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if(l2sc->tei == GROUP_TEI)
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{
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log(LOG_WARNING, "i4b: unit %d, denied TEI, no TEI values available from exchange!\n", l2sc->unit);
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DBGL2(L2_TEI_ERR, "i4b_tei_rx_frame", ("TEI ID Denied, No TEI values available from exchange!\n"));
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}
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else
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{
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log(LOG_WARNING, "i4b: unit %d, denied TEI = %d = 0x%02x\n", l2sc->unit, l2sc->tei, l2sc->tei);
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DBGL2(L2_TEI_ERR, "i4b_tei_rx_frame", ("TEI ID Denied - TEI = %d\n", l2sc->tei));
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}
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MDL_Status_Ind(l2sc->unit, STI_TEIASG, -1);
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i4b_next_l2state(l2sc, EV_MDERRRS);
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}
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break;
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case MT_ID_CHK_REQ:
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if( (l2sc->tei_valid == TEI_VALID) &&
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( (l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI))) ||
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(GROUP_TEI == GET_TEIFROMAI(*(ptr+OFF_AI))) ))
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{
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static int lasttei = -1;
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if(l2sc->tei != lasttei)
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{
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DBGL2(L2_TEI_MSG, "i4b_tei_rx_frame", ("TEI ID Check Req - TEI = %d\n", l2sc->tei));
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lasttei = l2sc->tei;
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}
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if(l2sc->T202 == TIMER_ACTIVE)
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i4b_T202_stop(l2sc);
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i4b_tei_chkresp(l2sc);
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}
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break;
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case MT_ID_REMOVE:
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if( (l2sc->tei_valid == TEI_VALID) &&
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( (l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI))) ||
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(l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI)))))
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{
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l2sc->tei_valid = TEI_INVALID;
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l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
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log(LOG_INFO, "i4b: unit %d, removed TEI = %d = 0x%02x\n", l2sc->unit, l2sc->tei, l2sc->tei);
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DBGL2(L2_TEI_MSG, "i4b_tei_rx_frame", ("TEI ID Remove - TEI = %d\n", l2sc->tei));
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MDL_Status_Ind(l2sc->unit, STI_TEIASG, -1);
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i4b_next_l2state(l2sc, EV_MDREMRQ);
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}
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break;
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default:
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DBGL2(L2_TEI_ERR, "i4b_tei_rx_frame", ("UNKNOWN TEI MGMT Frame, type = 0x%x\n", *(ptr + OFF_MT)));
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i4b_print_frame(m->m_len, m->m_data);
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break;
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}
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i4b_Dfreembuf(m);
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}
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/*---------------------------------------------------------------------------*
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* allocate and fill up a TEI management frame for sending
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*---------------------------------------------------------------------------*/
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static struct mbuf *
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build_tei_mgmt_frame(l2_softc_t *l2sc, unsigned char type)
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{
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struct mbuf *m;
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if((m = i4b_Dgetmbuf(TEI_MGMT_FRM_LEN)) == NULL)
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return(NULL);
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m->m_data[TEIM_SAPIO] = 0xfc; /* SAPI = 63, CR = 0, EA = 0 */
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m->m_data[TEIM_TEIO] = 0xff; /* TEI = 127, EA = 1 */
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m->m_data[TEIM_UIO] = UI; /* UI */
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m->m_data[TEIM_MEIO] = MEI; /* MEI */
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m->m_data[TEIM_MTO] = type; /* message type */
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switch(type)
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{
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case MT_ID_REQEST:
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i4b_make_rand_ri(l2sc);
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m->m_data[TEIM_RILO] = l2sc->last_ril;
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m->m_data[TEIM_RIHO] = l2sc->last_rih;
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m->m_data[TEIM_AIO] = (GROUP_TEI << 1) | 0x01;
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break;
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case MT_ID_CHK_RSP:
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i4b_make_rand_ri(l2sc);
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m->m_data[TEIM_RILO] = l2sc->last_ril;
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m->m_data[TEIM_RIHO] = l2sc->last_rih;
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m->m_data[TEIM_AIO] = (l2sc->tei << 1) | 0x01;
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break;
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case MT_ID_VERIFY:
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m->m_data[TEIM_RILO] = 0;
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m->m_data[TEIM_RIHO] = 0;
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m->m_data[TEIM_AIO] = (l2sc->tei << 1) | 0x01;
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break;
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default:
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i4b_Dfreembuf(m);
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panic("build_tei_mgmt_frame: invalid type");
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break;
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}
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l2sc->stat.tx_tei++;
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return(m);
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}
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/*---------------------------------------------------------------------------*
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* i4b_tei_assign - TEI assignment procedure (Q.921, 5.3.2, pp 24)
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* T202func and N202 _MUST_ be set prior to calling this function !
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*---------------------------------------------------------------------------*/
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void
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i4b_tei_assign(l2_softc_t *l2sc)
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{
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struct mbuf *m;
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DBGL2(L2_TEI_MSG, "i4b_tei_assign", ("tx TEI ID_Request\n"));
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m = build_tei_mgmt_frame(l2sc, MT_ID_REQEST);
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if(m == NULL)
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panic("i4b_tei_assign: no mbuf");
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i4b_T202_start(l2sc);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* i4b_tei_assign - TEI verify procedure (Q.921, 5.3.5, pp 29)
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* T202func and N202 _MUST_ be set prior to calling this function !
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*---------------------------------------------------------------------------*/
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void
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i4b_tei_verify(l2_softc_t *l2sc)
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{
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struct mbuf *m;
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DBGL2(L2_TEI_MSG, "i4b_tei_verify", ("tx TEI ID_Verify\n"));
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m = build_tei_mgmt_frame(l2sc, MT_ID_VERIFY);
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if(m == NULL)
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panic("i4b_tei_verify: no mbuf");
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i4b_T202_start(l2sc);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* i4b_tei_chkresp - TEI check response procedure (Q.921, 5.3.5, pp 29)
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*---------------------------------------------------------------------------*/
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void
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i4b_tei_chkresp(l2_softc_t *l2sc)
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{
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struct mbuf *m;
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static int lasttei = 0;
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if(l2sc->tei != lasttei)
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{
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lasttei = l2sc->tei;
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DBGL2(L2_TEI_MSG, "i4b_tei_chkresp", ("tx TEI ID_Check_Response\n"));
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}
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m = build_tei_mgmt_frame(l2sc, MT_ID_CHK_RSP);
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if(m == NULL)
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panic("i4b_tei_chkresp: no mbuf");
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* generate some 16 bit "random" number used for TEI mgmt Ri field
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*---------------------------------------------------------------------------*/
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void
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i4b_make_rand_ri(l2_softc_t *l2sc)
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{
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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u_short val;
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read_random((char *)&val, sizeof(val));
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#else
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register u_short val;
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register int i;
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static int called = 42;
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val = (l2sc->last_rih << 8) | l2sc->last_ril;
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val += ++called;
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for(i=0; i < 50 ; i++, val++)
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{
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val |= l2sc->unit+i;
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val <<= i;
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val ^= (time.tv_sec >> 16) ^ time.tv_usec;
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val <<= i;
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val ^= time.tv_sec ^ (time.tv_usec >> 16);
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if(val != 0 && val != 0xffff)
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break;
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}
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#endif
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l2sc->last_rih = (val >> 8) & 0x00ff;
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l2sc->last_ril = val & 0x00ff;
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}
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#endif /* NI4BQ921 > 0 */
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