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NetBSD/sys/netisdn/i4b_tei.c
hubertf 142c2a33ba Remove duplicate #includes, patch contributed in private mail 
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.
2007-01-24 13:08:11 +00:00

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/*
* Copyright (c) 1997, 2000 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_tei.c - tei handling procedures
* -----------------------------------
*
* $Id: i4b_tei.c,v 1.10 2007/01/24 13:08:15 hubertf Exp $
*
* $FreeBSD$
*
* last edit-date: [Fri Jan 5 11:33:47 2001]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i4b_tei.c,v 1.10 2007/01/24 13:08:15 hubertf Exp $");
#ifdef __FreeBSD__
#include "i4bq921.h"
#else
#define NI4BQ921 1
#endif
#if NI4BQ921 > 0
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
#include <sys/callout.h>
#endif
#if defined(__FreeBSD__)
#if defined (__FreeBSD_version) && __FreeBSD_version <= 400000
#include <machine/random.h>
#else
#include <sys/random.h>
#endif
#endif
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#endif
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_l2fsm.h>
#include <netisdn/i4b_l3l4.h>
/*---------------------------------------------------------------------------*
* handle a received TEI management frame
*---------------------------------------------------------------------------*/
void
i4b_tei_rxframe(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
{
u_char *ptr = m->m_data;
switch(*(ptr + OFF_MT))
{
case MT_ID_ASSIGN:
if( (*(ptr + OFF_RIL) == l2sc->last_ril) &&
(*(ptr + OFF_RIH) == l2sc->last_rih))
{
l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
l2sc->tei_valid = TEI_VALID;
if(l2sc->T202 == TIMER_ACTIVE)
i4b_T202_stop(l2sc);
i4b_mdl_status_ind(drv, STI_TEIASG, l2sc->tei);
log(LOG_INFO, "i4b: isdnif %d, assigned TEI = %d = 0x%02x\n", l2sc->drv->isdnif, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_MSG, "TEI ID Assign - TEI = %d", l2sc->tei);
i4b_next_l2state(l2sc, drv, EV_MDASGRQ);
}
break;
case MT_ID_DENY:
if( (*(ptr + OFF_RIL) == l2sc->last_ril) &&
(*(ptr + OFF_RIH) == l2sc->last_rih))
{
l2sc->tei_valid = TEI_INVALID;
l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
if(l2sc->tei == GROUP_TEI)
{
log(LOG_WARNING, "i4b: isdnif %d, denied TEI, no TEI values available from exchange!\n", l2sc->drv->isdnif);
NDBGL2(L2_TEI_ERR, "TEI ID Denied, No TEI values available from exchange!");
}
else
{
log(LOG_WARNING, "i4b: isdnif %d, denied TEI = %d = 0x%02x\n", l2sc->drv->isdnif, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_ERR, "TEI ID Denied - TEI = %d", l2sc->tei);
}
i4b_mdl_status_ind(drv, STI_TEIASG, -1);
i4b_next_l2state(l2sc, drv, EV_MDERRRS);
}
break;
case MT_ID_CHK_REQ:
if( (l2sc->tei_valid == TEI_VALID) &&
( (l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI))) ||
(GROUP_TEI == GET_TEIFROMAI(*(ptr+OFF_AI))) ))
{
static int lasttei = -1;
if(l2sc->tei != lasttei)
{
NDBGL2(L2_TEI_MSG, "TEI ID Check Req - TEI = %d", l2sc->tei);
lasttei = l2sc->tei;
}
if(l2sc->T202 == TIMER_ACTIVE)
i4b_T202_stop(l2sc);
i4b_tei_chkresp(l2sc);
}
break;
case MT_ID_REMOVE:
if( (l2sc->tei_valid == TEI_VALID) &&
( (l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI))) ||
(l2sc->tei == GET_TEIFROMAI(*(ptr+OFF_AI)))))
{
l2sc->tei_valid = TEI_INVALID;
l2sc->tei = GET_TEIFROMAI(*(ptr+OFF_AI));
log(LOG_INFO, "i4b: isdnif %d, removed TEI = %d = 0x%02x\n", drv->isdnif, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_MSG, "TEI ID Remove - TEI = %d", l2sc->tei);
i4b_mdl_status_ind(drv, STI_TEIASG, -1);
i4b_next_l2state(l2sc, drv, EV_MDREMRQ);
}
break;
default:
NDBGL2(L2_TEI_ERR, "UNKNOWN TEI MGMT Frame, type = 0x%x", *(ptr + OFF_MT));
i4b_print_frame(m->m_len, m->m_data);
break;
}
i4b_Dfreembuf(m);
}
/*---------------------------------------------------------------------------*
* allocate and fill up a TEI management frame for sending
*---------------------------------------------------------------------------*/
static struct mbuf *
build_tei_mgmt_frame(l2_softc_t *l2sc, unsigned char type)
{
struct mbuf *m;
if((m = i4b_Dgetmbuf(TEI_MGMT_FRM_LEN)) == NULL)
return(NULL);
m->m_data[TEIM_SAPIO] = 0xfc; /* SAPI = 63, CR = 0, EA = 0 */
m->m_data[TEIM_TEIO] = 0xff; /* TEI = 127, EA = 1 */
m->m_data[TEIM_UIO] = UI; /* UI */
m->m_data[TEIM_MEIO] = MEI; /* MEI */
m->m_data[TEIM_MTO] = type; /* message type */
switch(type)
{
case MT_ID_REQEST:
i4b_make_rand_ri(l2sc);
m->m_data[TEIM_RILO] = l2sc->last_ril;
m->m_data[TEIM_RIHO] = l2sc->last_rih;
m->m_data[TEIM_AIO] = (GROUP_TEI << 1) | 0x01;
break;
case MT_ID_CHK_RSP:
i4b_make_rand_ri(l2sc);
m->m_data[TEIM_RILO] = l2sc->last_ril;
m->m_data[TEIM_RIHO] = l2sc->last_rih;
m->m_data[TEIM_AIO] = (l2sc->tei << 1) | 0x01;
break;
case MT_ID_VERIFY:
m->m_data[TEIM_RILO] = 0;
m->m_data[TEIM_RIHO] = 0;
m->m_data[TEIM_AIO] = (l2sc->tei << 1) | 0x01;
break;
default:
i4b_Dfreembuf(m);
panic("build_tei_mgmt_frame: invalid type");
break;
}
l2sc->stat.tx_tei++;
return(m);
}
/*---------------------------------------------------------------------------*
* i4b_tei_assign - TEI assignment procedure (Q.921, 5.3.2, pp 24)
* T202func and N202 _MUST_ be set prior to calling this function !
*---------------------------------------------------------------------------*/
void
i4b_tei_assign(l2_softc_t *l2sc)
{
struct mbuf *m;
NDBGL2(L2_TEI_MSG, "tx TEI ID_Request");
m = build_tei_mgmt_frame(l2sc, MT_ID_REQEST);
if(m == NULL)
panic("i4b_tei_assign: no mbuf");
i4b_T202_start(l2sc);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* i4b_tei_assign - TEI verify procedure (Q.921, 5.3.5, pp 29)
* T202func and N202 _MUST_ be set prior to calling this function !
*---------------------------------------------------------------------------*/
void
i4b_tei_verify(l2_softc_t *l2sc)
{
struct mbuf *m;
NDBGL2(L2_TEI_MSG, "tx TEI ID_Verify");
m = build_tei_mgmt_frame(l2sc, MT_ID_VERIFY);
if(m == NULL)
panic("i4b_tei_verify: no mbuf");
i4b_T202_start(l2sc);
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* i4b_tei_chkresp - TEI check response procedure (Q.921, 5.3.5, pp 29)
*---------------------------------------------------------------------------*/
void
i4b_tei_chkresp(l2_softc_t *l2sc)
{
struct mbuf *m;
static int lasttei = 0;
if(l2sc->tei != lasttei)
{
lasttei = l2sc->tei;
NDBGL2(L2_TEI_MSG, "tx TEI ID_Check_Response");
}
m = build_tei_mgmt_frame(l2sc, MT_ID_CHK_RSP);
if(m == NULL)
panic("i4b_tei_chkresp: no mbuf");
l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* generate some 16 bit "random" number used for TEI mgmt Ri field
*---------------------------------------------------------------------------*/
void
i4b_make_rand_ri(l2_softc_t *l2sc)
{
#if defined(__FreeBSD__)
u_short val;
#ifdef RANDOMDEV
read_random((char *)&val, sizeof(val));
#else
val = (u_short)random();
#endif /* RANDOMDEV */
#else
register u_short val;
register int i;
static int called = 42;
struct timeval t;
val = (l2sc->last_rih << 8) | l2sc->last_ril;
val += ++called;
for(i=0; i < 50 ; i++, val++)
{
getmicrotime(&t);
val |= l2sc->drv->isdnif+i;
val <<= i;
val ^= (t.tv_sec >> 16) ^ t.tv_usec;
val <<= i;
val ^= t.tv_sec ^ (t.tv_usec >> 16);
if(val != 0 && val != 0xffff)
break;
}
#endif
l2sc->last_rih = (val >> 8) & 0x00ff;
l2sc->last_ril = val & 0x00ff;
}
#endif /* NI4BQ921 > 0 */
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