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freebsd-skq/sys/i4b/layer2/i4b_uframe.c

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/*
* Copyright (c) 1997, 1999 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_uframe.c - routines for handling U-frames
* -----------------------------------------------
*
* $Id: i4b_uframe.c,v 1.7 1999/02/14 09:45:00 hm Exp $
*
* last edit-date: [Sun Feb 14 10:32:17 1999]
*
*---------------------------------------------------------------------------*/
#ifdef __FreeBSD__
#include "i4bq921.h"
#else
#define NI4BQ921 1
#endif
#if NI4BQ921 > 0
#include <sys/param.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <sys/ioccom.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <i4b/i4b_debug.h>
#include <i4b/i4b_ioctl.h>
#endif
#include <i4b/include/i4b_l1l2.h>
#include <i4b/include/i4b_l2l3.h>
#include <i4b/include/i4b_isdnq931.h>
#include <i4b/include/i4b_mbuf.h>
#include <i4b/layer2/i4b_l2.h>
#include <i4b/layer2/i4b_l2fsm.h>
/*---------------------------------------------------------------------------*
* process a received U-frame
*---------------------------------------------------------------------------*/
void
i4b_rxd_u_frame(int unit, struct mbuf *m)
{
l2_softc_t *l2sc = &l2_softc[unit];
u_char *ptr = m->m_data;
int sapi = GETSAPI(*(ptr + OFF_SAPI));
int tei = GETTEI(*(ptr + OFF_TEI));
int pfbit = GETUPF(*(ptr + OFF_CNTL));
switch(*(ptr + OFF_CNTL) & ~UPFBIT)
{
/* commands */
case SABME:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("SABME, sapi = %d, tei = %d\n", sapi, tei));
l2sc->rxd_PF = pfbit;
i4b_next_l2state(l2sc, EV_RXSABME);
}
i4b_Dfreembuf(m);
break;
case UI:
if(sapi == SAPI_L2M &&
tei == GROUP_TEI &&
*(ptr + OFF_MEI) == MEI)
{
/* layer 2 management (SAPI = 63) */
i4b_tei_rxframe(unit, m);
}
else if(sapi == SAPI_CCP && tei == GROUP_TEI)
{
/* call control (SAPI = 0) */
/* strip ui header */
m_adj(m, UI_HDR_LEN);
/* to upper layer */
DL_Unit_Data_Ind(unit, m);
}
else
{
DBGL2(L2_U_ERR, "i4b_rxd_u_frame", ("unknown UI frame!\n"));
i4b_Dfreembuf(m);
}
break;
case DISC:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("DISC, sapi = %d, tei = %d\n", sapi, tei));
l2sc->rxd_PF = pfbit;
i4b_next_l2state(l2sc, EV_RXDISC);
}
i4b_Dfreembuf(m);
break;
case XID:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("XID, sapi = %d, tei = %d\n", sapi, tei));
}
i4b_Dfreembuf(m);
break;
/* responses */
case DM:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("DM, sapi = %d, tei = %d\n", sapi, tei));
i4b_print_frame(m->m_len, m->m_data);
l2sc->rxd_PF = pfbit;
i4b_next_l2state(l2sc, EV_RXDM);
}
i4b_Dfreembuf(m);
break;
case UA:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("UA, sapi = %d, tei = %d\n", sapi, tei));
l2sc->rxd_PF = pfbit;
i4b_next_l2state(l2sc, EV_RXUA);
}
i4b_Dfreembuf(m);
break;
case FRMR:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_MSG, "i4b_rxd_u_frame", ("FRMR, sapi = %d, tei = %d\n", sapi, tei));
l2sc->rxd_PF = pfbit;
i4b_next_l2state(l2sc, EV_RXFRMR);
}
i4b_Dfreembuf(m);
break;
default:
if((l2sc->tei_valid == TEI_VALID) &&
(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
{
DBGL2(L2_U_ERR, "i4b_rxd_u_frame", ("UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei));
i4b_print_frame(m->m_len, m->m_data);
}
else
{
DBGL2(L2_U_ERR, "i4b_rxd_u_frame", ("not mine - UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei));
i4b_print_frame(m->m_len, m->m_data);
}
i4b_Dfreembuf(m);
break;
}
}
/*---------------------------------------------------------------------------*
* build U-frame for sending
*---------------------------------------------------------------------------*/
struct mbuf *
i4b_build_u_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
{
struct mbuf *m;
if((m = i4b_Dgetmbuf(U_FRAME_LEN)) == NULL)
return(NULL);
PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
if(pbit)
m->m_data[OFF_CNTL] = type | UPBITSET;
else
m->m_data[OFF_CNTL] = type & ~UPBITSET;
return(m);
}
/*---------------------------------------------------------------------------*
* transmit SABME command
*---------------------------------------------------------------------------*/
void
i4b_tx_sabme(l2_softc_t *l2sc, pbit_t pbit)
{
struct mbuf *m;
DBGL2(L2_U_MSG, "i4b_tx_sabme", ("tx SABME, tei = %d\n", l2sc->tei));
m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, SABME);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* transmit DM response
*---------------------------------------------------------------------------*/
void
i4b_tx_dm(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
DBGL2(L2_U_MSG, "i4b_tx_dm", ("tx DM, tei = %d\n", l2sc->tei));
m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, DM);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* transmit DISC command
*---------------------------------------------------------------------------*/
void
i4b_tx_disc(l2_softc_t *l2sc, pbit_t pbit)
{
struct mbuf *m;
DBGL2(L2_U_MSG, "i4b_tx_disc", ("tx DISC, tei = %d\n", l2sc->tei));
m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, DISC);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* transmit UA response
*---------------------------------------------------------------------------*/
void
i4b_tx_ua(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
DBGL2(L2_U_MSG, "i4b_tx_ua", ("tx UA, tei = %d\n", l2sc->tei));
m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, UA);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
/*---------------------------------------------------------------------------*
* transmit FRMR response
*---------------------------------------------------------------------------*/
void
i4b_tx_frmr(l2_softc_t *l2sc, fbit_t fbit)
{
struct mbuf *m;
DBGL2(L2_U_MSG, "i4b_tx_frmr", ("tx FRMR, tei = %d\n", l2sc->tei));
m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, FRMR);
PH_Data_Req(l2sc->unit, m, MBUF_FREE);
}
#endif /* NI4BQ921 > 0 */
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