277 lines
7.8 KiB
C
277 lines
7.8 KiB
C
/*
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* Copyright (c) 1997, 2002 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_uframe.c - routines for handling U-frames
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* -----------------------------------------------
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* last edit-date: [Sat Mar 9 17:54:08 2002]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.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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#include <machine/i4b_debug.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_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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* process a received U-frame
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*---------------------------------------------------------------------------*/
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void
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i4b_rxd_u_frame(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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int sapi = GETSAPI(*(ptr + OFF_SAPI));
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int tei = GETTEI(*(ptr + OFF_TEI));
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int pfbit = GETUPF(*(ptr + OFF_CNTL));
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switch(*(ptr + OFF_CNTL) & ~UPFBIT)
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{
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/* commands */
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case SABME:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_sabme++;
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NDBGL2(L2_U_MSG, "SABME, sapi = %d, tei = %d", sapi, tei);
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l2sc->rxd_PF = pfbit;
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i4b_next_l2state(l2sc, EV_RXSABME);
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}
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i4b_Dfreembuf(m);
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break;
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case UI:
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if(sapi == SAPI_L2M &&
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tei == GROUP_TEI &&
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*(ptr + OFF_MEI) == MEI)
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{
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/* layer 2 management (SAPI = 63) */
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l2sc->stat.rx_tei++;
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i4b_tei_rxframe(unit, m);
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}
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else if(sapi == SAPI_CCP && tei == GROUP_TEI)
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{
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/* call control (SAPI = 0) */
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l2sc->stat.rx_ui++;
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/* strip ui header */
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m_adj(m, UI_HDR_LEN);
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/* to upper layer */
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DL_Unit_Data_Ind(unit, m);
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}
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else
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{
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l2sc->stat.err_rx_badui++;
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NDBGL2(L2_U_ERR, "unknown UI frame!");
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i4b_Dfreembuf(m);
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}
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break;
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case DISC:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_disc++;
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NDBGL2(L2_U_MSG, "DISC, sapi = %d, tei = %d", sapi, tei);
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l2sc->rxd_PF = pfbit;
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i4b_next_l2state(l2sc, EV_RXDISC);
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}
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i4b_Dfreembuf(m);
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break;
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case XID:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_xid++;
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NDBGL2(L2_U_MSG, "XID, sapi = %d, tei = %d", sapi, tei);
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}
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i4b_Dfreembuf(m);
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break;
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/* responses */
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case DM:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_dm++;
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NDBGL2(L2_U_MSG, "DM, sapi = %d, tei = %d", sapi, tei);
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i4b_print_frame(m->m_len, m->m_data);
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l2sc->rxd_PF = pfbit;
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i4b_next_l2state(l2sc, EV_RXDM);
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}
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i4b_Dfreembuf(m);
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break;
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case UA:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_ua++;
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NDBGL2(L2_U_MSG, "UA, sapi = %d, tei = %d", sapi, tei);
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l2sc->rxd_PF = pfbit;
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i4b_next_l2state(l2sc, EV_RXUA);
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}
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i4b_Dfreembuf(m);
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break;
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case FRMR:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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l2sc->stat.rx_frmr++;
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NDBGL2(L2_U_MSG, "FRMR, sapi = %d, tei = %d", sapi, tei);
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l2sc->rxd_PF = pfbit;
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i4b_next_l2state(l2sc, EV_RXFRMR);
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}
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i4b_Dfreembuf(m);
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break;
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default:
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if((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI))))
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{
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NDBGL2(L2_U_ERR, "UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei);
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i4b_print_frame(m->m_len, m->m_data);
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}
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else
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{
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NDBGL2(L2_U_ERR, "not mine - UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei);
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i4b_print_frame(m->m_len, m->m_data);
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}
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l2sc->stat.err_rx_badui++;
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i4b_Dfreembuf(m);
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break;
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}
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}
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/*---------------------------------------------------------------------------*
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* build U-frame for sending
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*---------------------------------------------------------------------------*/
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struct mbuf *
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i4b_build_u_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
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{
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struct mbuf *m;
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if((m = i4b_Dgetmbuf(U_FRAME_LEN)) == NULL)
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return(NULL);
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PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
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PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
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if(pbit)
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m->m_data[OFF_CNTL] = type | UPBITSET;
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else
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m->m_data[OFF_CNTL] = type & ~UPBITSET;
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return(m);
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}
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/*---------------------------------------------------------------------------*
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* transmit SABME command
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_sabme(l2_softc_t *l2sc, pbit_t pbit)
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{
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struct mbuf *m;
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l2sc->stat.tx_sabme++;
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NDBGL2(L2_U_MSG, "tx SABME, tei = %d", l2sc->tei);
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m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, SABME);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* transmit DM response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_dm(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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l2sc->stat.tx_dm++;
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NDBGL2(L2_U_MSG, "tx DM, tei = %d", l2sc->tei);
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m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, DM);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* transmit DISC command
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_disc(l2_softc_t *l2sc, pbit_t pbit)
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{
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struct mbuf *m;
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l2sc->stat.tx_disc++;
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NDBGL2(L2_U_MSG, "tx DISC, tei = %d", l2sc->tei);
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m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, DISC);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* transmit UA response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_ua(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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l2sc->stat.tx_ua++;
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NDBGL2(L2_U_MSG, "tx UA, tei = %d", l2sc->tei);
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m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, UA);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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/*---------------------------------------------------------------------------*
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* transmit FRMR response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_frmr(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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l2sc->stat.tx_frmr++;
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NDBGL2(L2_U_MSG, "tx FRMR, tei = %d", l2sc->tei);
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m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, FRMR);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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}
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