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freebsd-dev/sys/i4b/layer2/i4b_tei.c

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/*-
* Copyright (c) 1997, 2002 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
* -----------------------------------
* last edit-date: [Sat Mar 9 17:53:27 2002]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <machine/i4b_debug.h>
#include <i4b/include/i4b_global.h>
#include <i4b/include/i4b_l1l2.h>
#include <i4b/include/i4b_l2l3.h>
#include <i4b/include/i4b_mbuf.h>
#include <i4b/layer2/i4b_l2.h>
#include <i4b/layer2/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* handle a received TEI management frame
*---------------------------------------------------------------------------*/
void
i4b_tei_rxframe(int unit, struct mbuf *m)
{
l2_softc_t *l2sc = &l2_softc[unit];
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);
MDL_Status_Ind(l2sc->unit, STI_TEIASG, l2sc->tei);
log(LOG_INFO, "i4b: unit %d, assigned TEI = %d = 0x%02x\n", l2sc->unit, 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: unit %d, denied TEI, no TEI values available from exchange!\n", l2sc->unit);
NDBGL2(L2_TEI_ERR, "TEI ID Denied, No TEI values available from exchange!");
}
else
{
log(LOG_WARNING, "i4b: unit %d, denied TEI = %d = 0x%02x\n", l2sc->unit, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_ERR, "TEI ID Denied - TEI = %d", l2sc->tei);
}
MDL_Status_Ind(l2sc->unit, 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: unit %d, removed TEI = %d = 0x%02x\n", l2sc->unit, l2sc->tei, l2sc->tei);
NDBGL2(L2_TEI_MSG, "TEI ID Remove - TEI = %d", l2sc->tei);
MDL_Status_Ind(l2sc->unit, 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);
PH_Data_Req(l2sc->unit, 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);
PH_Data_Req(l2sc->unit, 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");
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* generate some 16 bit "random" number used for TEI mgmt Ri field
*---------------------------------------------------------------------------*/
void
i4b_make_rand_ri(l2_softc_t *l2sc)
{
u_short val;
#ifdef RANDOMDEV
read_random((char *)&val, sizeof(val));
#else
val = (u_short)random();
#endif /* RANDOMDEV */
l2sc->last_rih = (val >> 8) & 0x00ff;
l2sc->last_ril = val & 0x00ff;
}
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