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NetBSD/sys/netisdn/i4b_tei.c
martin 5171d409a5 First step to cleanup the hardware driver <-> upper layers interface. 
This now provides slightly more functionality than the FreeBSD layer1-newbus
interface. It was meant to be a simple change to one header and a few
c files, but the change rippled all through various stuff.

To prevent a change to the kernel<->userland interface right now the kernel
is now lying about card types to userland (but who cares). This will be fixed
when the userland interface changes, after layer 3 <-> layer 4 has been
fixed.

Functional changes:

Provide a clean interface for hardware drivers to attach to the upper
layers. This will need another small change in the B-channel handling
when a similar change to the layer 3 <-> layer 4 interface happens.

Avoid passing indices into global arrays of pointers around, instead pass
the pointers itself. Don't code hardware driver types by predefined magic
numbers (think LKM). Prepare for detachable drivers (think pcmcia).

While there remove some sets of function pointers always pointing to the
same function (meant to be the configurable set of D channel protocol
handlers). It is unlikely another supported D-channel protocol will fit into
that (maximal layer interface) abstraction. When we get support for another
protocol, we will need to come up with a workable interface. Besides, the
old implementation was, uhm, strange.
2001-03-24 12:40:29 +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 1.2 2001/03/24 12:40:32 martin Exp $
*
* $FreeBSD$
*
* last edit-date: [Fri Jan 5 11:33:47 2001]
*
*---------------------------------------------------------------------------*/
#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_l1l2.h>
#include <netisdn/i4b_isdnq931.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_l2.h>
#include <netisdn/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* handle a received TEI management frame
*---------------------------------------------------------------------------*/
void
i4b_tei_rxframe(l2_softc_t *l2sc, 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(l2sc->bri, STI_TEIASG, l2sc->tei);
log(LOG_INFO, "i4b: bri %d, assigned TEI = %d = 0x%02x\n", l2sc->bri, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_MSG, "TEI ID Assign - TEI = %d", l2sc->tei);
i4b_next_l2state(l2sc, 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: bri %d, denied TEI, no TEI values available from exchange!\n", l2sc->bri);
NDBGL2(L2_TEI_ERR, "TEI ID Denied, No TEI values available from exchange!");
}
else
{
log(LOG_WARNING, "i4b: bri %d, denied TEI = %d = 0x%02x\n", l2sc->bri, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_ERR, "TEI ID Denied - TEI = %d", l2sc->tei);
}
i4b_mdl_status_ind(l2sc->bri, STI_TEIASG, -1);
i4b_next_l2state(l2sc, 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: bri %d, removed TEI = %d = 0x%02x\n", l2sc->bri, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_MSG, "TEI ID Remove - TEI = %d", l2sc->tei);
i4b_mdl_status_ind(l2sc->bri, STI_TEIASG, -1);
i4b_next_l2state(l2sc, 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;
val = (l2sc->last_rih << 8) | l2sc->last_ril;
val += ++called;
for(i=0; i < 50 ; i++, val++)
{
val |= l2sc->bri+i;
val <<= i;
val ^= (time.tv_sec >> 16) ^ time.tv_usec;
val <<= i;
val ^= time.tv_sec ^ (time.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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