/* * Copyright (c) 1997, 1998 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 1.6 1998/12/05 18:05:24 hm Exp $ * * last edit-date: [Sat Dec 5 18:30:33 1998] * *---------------------------------------------------------------------------*/ #ifdef __FreeBSD__ #include "i4bq921.h" #else #define NI4BQ921 1 #endif #if NI4BQ921 > 0 #include #if defined(__FreeBSD__) && __FreeBSD__ >= 3 #include #else #include #endif #include #include #include #include #include #ifdef __FreeBSD__ #include #include #else #include #include #endif #include #include #include #include #include #include /*---------------------------------------------------------------------------* * 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 */