Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netisdn/i4b_uframe.c
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1 /* 2 * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 *--------------------------------------------------------------------------- 26 * 27 * i4b_uframe.c - routines for handling U-frames 28 * ----------------------------------------------- 29 * 30 * $Id: i4b_uframe.c,v 1.5 2002/05/21 10:31:11 martin Exp $ 31 * 32 * $FreeBSD$ 33 * 34 * last edit-date: [Fri Jan 5 11:33:47 2001] 35 * 36 *---------------------------------------------------------------------------*/ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: i4b_uframe.c,v 1.5 2002/05/21 10:31:11 martin Exp $"); 40 41 #ifdef __FreeBSD__ 42 #include "i4bq921.h" 43 #else 44 #define NI4BQ921 1 45 #endif 46 #if NI4BQ921 > 0 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <net/if.h> 54 55 #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000 56 #include <sys/callout.h> 57 #endif 58 59 #ifdef __FreeBSD__ 60 #include <machine/i4b_debug.h> 61 #include <machine/i4b_ioctl.h> 62 #else 63 #include <netisdn/i4b_debug.h> 64 #include <netisdn/i4b_ioctl.h> 65 #endif 66 67 #include <netisdn/i4b_l2.h> 68 #include <netisdn/i4b_l1l2.h> 69 #include <netisdn/i4b_isdnq931.h> 70 #include <netisdn/i4b_mbuf.h> 71 72 #include <netisdn/i4b_l2.h> 73 #include <netisdn/i4b_l2fsm.h> 74 75 /*---------------------------------------------------------------------------* 76 * process a received U-frame 77 *---------------------------------------------------------------------------*/ 78 void 79 i4b_rxd_u_frame(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m) 80 { 81 u_char *ptr = m->m_data; 82 83 int sapi = GETSAPI(*(ptr + OFF_SAPI)); 84 int tei = GETTEI(*(ptr + OFF_TEI)); 85 int pfbit = GETUPF(*(ptr + OFF_CNTL)); 86 87 switch(*(ptr + OFF_CNTL) & ~UPFBIT) 88 { 89 /* commands */ 90 91 case SABME: 92 if((l2sc->tei_valid == TEI_VALID) && 93 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 94 { 95 l2sc->stat.rx_sabme++; 96 NDBGL2(L2_U_MSG, "SABME, sapi = %d, tei = %d", sapi, tei); 97 l2sc->rxd_PF = pfbit; 98 i4b_next_l2state(l2sc, drv, EV_RXSABME); 99 } 100 i4b_Dfreembuf(m); 101 break; 102 103 case UI: 104 if(sapi == SAPI_L2M && 105 tei == GROUP_TEI && 106 *(ptr + OFF_MEI) == MEI) 107 { 108 /* layer 2 management (SAPI = 63) */ 109 l2sc->stat.rx_tei++; 110 i4b_tei_rxframe(l2sc, drv, m); 111 } 112 else if(sapi == SAPI_CCP && tei == GROUP_TEI) 113 { 114 /* call control (SAPI = 0) */ 115 l2sc->stat.rx_ui++; 116 /* strip ui header */ 117 m_adj(m, UI_HDR_LEN); 118 /* to upper layer */ 119 i4b_dl_unit_data_ind(l2sc->drv, m); 120 } 121 else 122 { 123 l2sc->stat.err_rx_badui++; 124 NDBGL2(L2_U_ERR, "unknown UI frame!"); 125 i4b_Dfreembuf(m); 126 } 127 break; 128 129 case DISC: 130 if((l2sc->tei_valid == TEI_VALID) && 131 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 132 { 133 l2sc->stat.rx_disc++; 134 NDBGL2(L2_U_MSG, "DISC, sapi = %d, tei = %d", sapi, tei); 135 l2sc->rxd_PF = pfbit; 136 i4b_next_l2state(l2sc, drv, EV_RXDISC); 137 } 138 i4b_Dfreembuf(m); 139 break; 140 141 case XID: 142 if((l2sc->tei_valid == TEI_VALID) && 143 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 144 { 145 l2sc->stat.rx_xid++; 146 NDBGL2(L2_U_MSG, "XID, sapi = %d, tei = %d", sapi, tei); 147 } 148 i4b_Dfreembuf(m); 149 break; 150 151 /* responses */ 152 153 case DM: 154 if((l2sc->tei_valid == TEI_VALID) && 155 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 156 { 157 l2sc->stat.rx_dm++; 158 NDBGL2(L2_U_MSG, "DM, sapi = %d, tei = %d", sapi, tei); 159 i4b_print_frame(m->m_len, m->m_data); 160 l2sc->rxd_PF = pfbit; 161 i4b_next_l2state(l2sc, drv, EV_RXDM); 162 } 163 i4b_Dfreembuf(m); 164 break; 165 166 case UA: 167 if((l2sc->tei_valid == TEI_VALID) && 168 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 169 { 170 l2sc->stat.rx_ua++; 171 NDBGL2(L2_U_MSG, "UA, sapi = %d, tei = %d", sapi, tei); 172 l2sc->rxd_PF = pfbit; 173 i4b_next_l2state(l2sc, drv, EV_RXUA); 174 } 175 i4b_Dfreembuf(m); 176 break; 177 178 case FRMR: 179 if((l2sc->tei_valid == TEI_VALID) && 180 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 181 { 182 l2sc->stat.rx_frmr++; 183 NDBGL2(L2_U_MSG, "FRMR, sapi = %d, tei = %d", sapi, tei); 184 l2sc->rxd_PF = pfbit; 185 i4b_next_l2state(l2sc, drv, EV_RXFRMR); 186 } 187 i4b_Dfreembuf(m); 188 break; 189 190 default: 191 if((l2sc->tei_valid == TEI_VALID) && 192 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))) 193 { 194 NDBGL2(L2_U_ERR, "UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei); 195 i4b_print_frame(m->m_len, m->m_data); 196 } 197 else 198 { 199 NDBGL2(L2_U_ERR, "not mine - UNKNOWN TYPE ERROR, sapi = %d, tei = %d, frame = ", sapi, tei); 200 i4b_print_frame(m->m_len, m->m_data); 201 } 202 l2sc->stat.err_rx_badui++; 203 i4b_Dfreembuf(m); 204 break; 205 } 206 } 207 208 /*---------------------------------------------------------------------------* 209 * build U-frame for sending 210 *---------------------------------------------------------------------------*/ 211 struct mbuf * 212 i4b_build_u_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type) 213 { 214 struct mbuf *m; 215 216 if((m = i4b_Dgetmbuf(U_FRAME_LEN)) == NULL) 217 return(NULL); 218 219 PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]); 220 221 PUTTEI(l2sc->tei, m->m_data[OFF_TEI]); 222 223 if(pbit) 224 m->m_data[OFF_CNTL] = type | UPBITSET; 225 else 226 m->m_data[OFF_CNTL] = type & ~UPBITSET; 227 228 return(m); 229 } 230 231 /*---------------------------------------------------------------------------* 232 * transmit SABME command 233 *---------------------------------------------------------------------------*/ 234 void 235 i4b_tx_sabme(l2_softc_t *l2sc, pbit_t pbit) 236 { 237 struct mbuf *m; 238 239 l2sc->stat.tx_sabme++; 240 NDBGL2(L2_U_MSG, "tx SABME, tei = %d", l2sc->tei); 241 m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, SABME); 242 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE); 243 } 244 245 /*---------------------------------------------------------------------------* 246 * transmit DM response 247 *---------------------------------------------------------------------------*/ 248 void 249 i4b_tx_dm(l2_softc_t *l2sc, fbit_t fbit) 250 { 251 struct mbuf *m; 252 253 l2sc->stat.tx_dm++; 254 NDBGL2(L2_U_MSG, "tx DM, tei = %d", l2sc->tei); 255 m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, DM); 256 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE); 257 } 258 259 /*---------------------------------------------------------------------------* 260 * transmit DISC command 261 *---------------------------------------------------------------------------*/ 262 void 263 i4b_tx_disc(l2_softc_t *l2sc, pbit_t pbit) 264 { 265 struct mbuf *m; 266 267 l2sc->stat.tx_disc++; 268 NDBGL2(L2_U_MSG, "tx DISC, tei = %d", l2sc->tei); 269 m = i4b_build_u_frame(l2sc, CR_CMD_TO_NT, pbit, DISC); 270 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE); 271 } 272 273 /*---------------------------------------------------------------------------* 274 * transmit UA response 275 *---------------------------------------------------------------------------*/ 276 void 277 i4b_tx_ua(l2_softc_t *l2sc, fbit_t fbit) 278 { 279 struct mbuf *m; 280 281 l2sc->stat.tx_ua++; 282 NDBGL2(L2_U_MSG, "tx UA, tei = %d", l2sc->tei); 283 m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, UA); 284 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE); 285 } 286 287 /*---------------------------------------------------------------------------* 288 * transmit FRMR response 289 *---------------------------------------------------------------------------*/ 290 void 291 i4b_tx_frmr(l2_softc_t *l2sc, fbit_t fbit) 292 { 293 struct mbuf *m; 294 295 l2sc->stat.tx_frmr++; 296 NDBGL2(L2_U_MSG, "tx FRMR, tei = %d", l2sc->tei); 297 m = i4b_build_u_frame(l2sc, CR_RSP_TO_NT, fbit, FRMR); 298 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE); 299 } 300 301 #endif /* NI4BQ921 > 0 */
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