1 /* $NetBSD: rfcomm_dlc.c,v 1.9 2018/09/03 16:29:36 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Itronix Inc. 5 * All rights reserved. 6 * 7 * Written by Iain Hibbert for Itronix Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of Itronix Inc. may not be used to endorse 18 * or promote products derived from this software without specific 19 * prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 28 * ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: rfcomm_dlc.c,v 1.9 2018/09/03 16:29:36 riastradh Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/mbuf.h> 40 #include <sys/proc.h> 41 #include <sys/socketvar.h> 42 #include <sys/systm.h> 43 44 #include <netbt/bluetooth.h> 45 #include <netbt/hci.h> 46 #include <netbt/l2cap.h> 47 #include <netbt/rfcomm.h> 48 49 /* 50 * rfcomm_dlc_lookup(rfcomm_session, dlci) 51 * 52 * Find DLC on session with matching dlci 53 */ 54 struct rfcomm_dlc * 55 rfcomm_dlc_lookup(struct rfcomm_session *rs, int dlci) 56 { 57 struct rfcomm_dlc *dlc; 58 59 LIST_FOREACH(dlc, &rs->rs_dlcs, rd_next) { 60 if (dlc->rd_dlci == dlci) 61 break; 62 } 63 64 return dlc; 65 } 66 67 /* 68 * rfcomm_dlc_newconn(rfcomm_session, dlci) 69 * 70 * handle a new dlc request (since its called from a couple of places) 71 */ 72 struct rfcomm_dlc * 73 rfcomm_dlc_newconn(struct rfcomm_session *rs, int dlci) 74 { 75 struct rfcomm_session *ls; 76 struct rfcomm_dlc *new, *dlc, *any, *best; 77 struct sockaddr_bt laddr, raddr, addr; 78 int chan; 79 80 /* 81 * Search amongst the listening DLC community for the best match for 82 * address & channel. We keep listening DLC's hanging on listening 83 * sessions in a last first order, so scan the entire bunch and keep 84 * a note of the best address and BDADDR_ANY matches in order to find 85 * the oldest and most specific match. 86 */ 87 l2cap_sockaddr_pcb(rs->rs_l2cap, &laddr); 88 l2cap_peeraddr_pcb(rs->rs_l2cap, &raddr); 89 chan = RFCOMM_CHANNEL(dlci); 90 new = NULL; 91 92 any = best = NULL; 93 LIST_FOREACH(ls, &rfcomm_session_listen, rs_next) { 94 l2cap_sockaddr_pcb(ls->rs_l2cap, &addr); 95 96 if (addr.bt_psm != laddr.bt_psm) 97 continue; 98 99 if (bdaddr_same(&laddr.bt_bdaddr, &addr.bt_bdaddr)) { 100 LIST_FOREACH(dlc, &ls->rs_dlcs, rd_next) { 101 if (dlc->rd_laddr.bt_channel == chan) 102 best = dlc; 103 } 104 } 105 106 if (bdaddr_any(&addr.bt_bdaddr)) { 107 LIST_FOREACH(dlc, &ls->rs_dlcs, rd_next) { 108 if (dlc->rd_laddr.bt_channel == chan) 109 any = dlc; 110 } 111 } 112 } 113 114 dlc = best ? best : any; 115 116 /* XXX 117 * Note that if this fails, we could have missed a chance to open 118 * a connection - really need to rewrite the strategy for storing 119 * listening DLC's so all can be checked in turn.. 120 */ 121 if (dlc != NULL) 122 new = (*dlc->rd_proto->newconn)(dlc->rd_upper, &laddr, &raddr); 123 124 if (new == NULL) { 125 rfcomm_session_send_frame(rs, RFCOMM_FRAME_DM, dlci); 126 return NULL; 127 } 128 129 new->rd_dlci = dlci; 130 new->rd_mtu = rfcomm_mtu_default; 131 new->rd_mode = dlc->rd_mode; 132 133 memcpy(&new->rd_laddr, &laddr, sizeof(struct sockaddr_bt)); 134 new->rd_laddr.bt_channel = chan; 135 136 memcpy(&new->rd_raddr, &raddr, sizeof(struct sockaddr_bt)); 137 new->rd_raddr.bt_channel = chan; 138 139 new->rd_session = rs; 140 new->rd_state = RFCOMM_DLC_WAIT_CONNECT; 141 LIST_INSERT_HEAD(&rs->rs_dlcs, new, rd_next); 142 143 return new; 144 } 145 146 /* 147 * rfcomm_dlc_close(dlc, error) 148 * 149 * detach DLC from session and clean up 150 */ 151 void 152 rfcomm_dlc_close(struct rfcomm_dlc *dlc, int err) 153 { 154 struct rfcomm_session *rs; 155 struct rfcomm_credit *credit; 156 157 KASSERT(dlc->rd_state != RFCOMM_DLC_CLOSED); 158 159 /* Clear credit history */ 160 rs = dlc->rd_session; 161 SIMPLEQ_FOREACH(credit, &rs->rs_credits, rc_next) 162 if (credit->rc_dlc == dlc) 163 credit->rc_dlc = NULL; 164 165 callout_stop(&dlc->rd_timeout); 166 167 LIST_REMOVE(dlc, rd_next); 168 dlc->rd_session = NULL; 169 dlc->rd_state = RFCOMM_DLC_CLOSED; 170 171 (*dlc->rd_proto->disconnected)(dlc->rd_upper, err); 172 173 /* 174 * It is the responsibility of the party who sends the last 175 * DISC(dlci) to disconnect the session, but we will schedule 176 * an expiry just in case that doesnt happen.. 177 */ 178 if (LIST_EMPTY(&rs->rs_dlcs)) { 179 if (rs->rs_state == RFCOMM_SESSION_LISTEN) 180 rfcomm_session_free(rs); 181 else 182 callout_schedule(&rs->rs_timeout, 183 rfcomm_ack_timeout * hz); 184 } 185 } 186 187 /* 188 * rfcomm_dlc_timeout(dlc) 189 * 190 * DLC timeout function is scheduled when we sent any of SABM, 191 * DISC, MCC_MSC, or MCC_PN and should be cancelled when we get 192 * the relevant response. There is nothing to do but shut this 193 * DLC down. 194 */ 195 void 196 rfcomm_dlc_timeout(void *arg) 197 { 198 struct rfcomm_dlc *dlc = arg; 199 200 mutex_enter(bt_lock); 201 callout_ack(&dlc->rd_timeout); 202 203 if (dlc->rd_state != RFCOMM_DLC_CLOSED) 204 rfcomm_dlc_close(dlc, ETIMEDOUT); 205 else if (dlc->rd_flags & RFCOMM_DLC_DETACH) { 206 callout_destroy(&dlc->rd_timeout); 207 free(dlc, M_BLUETOOTH); 208 } 209 210 mutex_exit(bt_lock); 211 } 212 213 /* 214 * rfcomm_dlc_setmode(rfcomm_dlc) 215 * 216 * Set link mode for DLC. This is only called when the session is 217 * already open, so we don't need to worry about any previous mode 218 * settings. 219 */ 220 int 221 rfcomm_dlc_setmode(struct rfcomm_dlc *dlc) 222 { 223 struct sockopt sopt; 224 int mode = 0, err; 225 226 KASSERT(dlc->rd_session != NULL); 227 KASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 228 229 DPRINTF("dlci %d, auth %s, encrypt %s, secure %s\n", dlc->rd_dlci, 230 (dlc->rd_mode & RFCOMM_LM_AUTH ? "yes" : "no"), 231 (dlc->rd_mode & RFCOMM_LM_ENCRYPT ? "yes" : "no"), 232 (dlc->rd_mode & RFCOMM_LM_SECURE ? "yes" : "no")); 233 234 if (dlc->rd_mode & RFCOMM_LM_AUTH) 235 mode |= L2CAP_LM_AUTH; 236 237 if (dlc->rd_mode & RFCOMM_LM_ENCRYPT) 238 mode |= L2CAP_LM_ENCRYPT; 239 240 if (dlc->rd_mode & RFCOMM_LM_SECURE) 241 mode |= L2CAP_LM_SECURE; 242 243 sockopt_init(&sopt, BTPROTO_L2CAP, SO_L2CAP_LM, 0); 244 sockopt_setint(&sopt, mode); 245 err = l2cap_setopt(dlc->rd_session->rs_l2cap, &sopt); 246 sockopt_destroy(&sopt); 247 248 return err; 249 } 250 251 /* 252 * rfcomm_dlc_connect(rfcomm_dlc) 253 * 254 * initiate DLC connection (session is already connected) 255 */ 256 int 257 rfcomm_dlc_connect(struct rfcomm_dlc *dlc) 258 { 259 struct rfcomm_mcc_pn pn; 260 int err = 0; 261 262 KASSERT(dlc->rd_session != NULL); 263 KASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 264 KASSERT(dlc->rd_state == RFCOMM_DLC_WAIT_SESSION); 265 266 /* 267 * If we have not already sent a PN on the session, we must send 268 * a PN to negotiate Credit Flow Control, and this setting will 269 * apply to all future connections for this session. We ask for 270 * this every time, in order to establish initial credits. 271 */ 272 memset(&pn, 0, sizeof(pn)); 273 pn.dlci = dlc->rd_dlci; 274 pn.priority = dlc->rd_dlci | 0x07; 275 pn.mtu = htole16(dlc->rd_mtu); 276 277 pn.flow_control = 0xf0; 278 dlc->rd_rxcred = (dlc->rd_rxsize / dlc->rd_mtu); 279 dlc->rd_rxcred = uimin(dlc->rd_rxcred, RFCOMM_CREDITS_DEFAULT); 280 pn.credits = dlc->rd_rxcred; 281 282 err = rfcomm_session_send_mcc(dlc->rd_session, 1, 283 RFCOMM_MCC_PN, &pn, sizeof(pn)); 284 if (err) 285 return err; 286 287 dlc->rd_state = RFCOMM_DLC_WAIT_CONNECT; 288 callout_schedule(&dlc->rd_timeout, rfcomm_mcc_timeout * hz); 289 290 return 0; 291 } 292 293 /* 294 * rfcomm_dlc_open(rfcomm_dlc) 295 * 296 * send "Modem Status Command" and mark DLC as open. 297 */ 298 int 299 rfcomm_dlc_open(struct rfcomm_dlc *dlc) 300 { 301 struct rfcomm_mcc_msc msc; 302 int err; 303 304 KASSERT(dlc->rd_session != NULL); 305 KASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 306 307 memset(&msc, 0, sizeof(msc)); 308 msc.address = RFCOMM_MKADDRESS(1, dlc->rd_dlci); 309 msc.modem = dlc->rd_lmodem & 0xfe; /* EA = 0 */ 310 msc.brk = 0x00 | 0x01; /* EA = 1 */ 311 312 err = rfcomm_session_send_mcc(dlc->rd_session, 1, 313 RFCOMM_MCC_MSC, &msc, sizeof(msc)); 314 if (err) 315 return err; 316 317 callout_schedule(&dlc->rd_timeout, rfcomm_mcc_timeout * hz); 318 319 dlc->rd_state = RFCOMM_DLC_OPEN; 320 (*dlc->rd_proto->connected)(dlc->rd_upper); 321 322 return 0; 323 } 324 325 /* 326 * rfcomm_dlc_start(rfcomm_dlc) 327 * 328 * Start sending data (and/or credits) for DLC. Our strategy is to 329 * send anything we can down to the l2cap layer. When credits run 330 * out, data will naturally bunch up. When not using credit flow 331 * control, we limit the number of packets we have pending to reduce 332 * flow control lag. 333 * We should deal with channel priority somehow. 334 */ 335 void 336 rfcomm_dlc_start(struct rfcomm_dlc *dlc) 337 { 338 struct rfcomm_session *rs = dlc->rd_session; 339 struct mbuf *m; 340 int len, credits; 341 342 KASSERT(rs != NULL); 343 KASSERT(rs->rs_state == RFCOMM_SESSION_OPEN); 344 KASSERT(dlc->rd_state == RFCOMM_DLC_OPEN); 345 346 for (;;) { 347 credits = 0; 348 len = dlc->rd_mtu; 349 if (rs->rs_flags & RFCOMM_SESSION_CFC) { 350 credits = (dlc->rd_rxsize / dlc->rd_mtu); 351 credits -= dlc->rd_rxcred; 352 credits = uimin(credits, RFCOMM_CREDITS_MAX); 353 354 if (credits > 0) 355 len--; 356 357 if (dlc->rd_txcred == 0) 358 len = 0; 359 } else { 360 if (rs->rs_flags & RFCOMM_SESSION_RFC) 361 break; 362 363 if (dlc->rd_rmodem & RFCOMM_MSC_FC) 364 break; 365 366 if (dlc->rd_pending > RFCOMM_CREDITS_DEFAULT) 367 break; 368 } 369 370 if (dlc->rd_txbuf == NULL) 371 len = 0; 372 373 if (len == 0) { 374 if (credits == 0) 375 break; 376 377 /* 378 * No need to send small numbers of credits on their 379 * own unless the other end hasn't many left. 380 */ 381 if (credits < RFCOMM_CREDITS_DEFAULT 382 && dlc->rd_rxcred > RFCOMM_CREDITS_DEFAULT) 383 break; 384 385 m = NULL; 386 } else { 387 /* 388 * take what data we can from (front of) txbuf 389 */ 390 m = dlc->rd_txbuf; 391 if (len < m->m_pkthdr.len) { 392 dlc->rd_txbuf = m_split(m, len, M_DONTWAIT); 393 if (dlc->rd_txbuf == NULL) { 394 dlc->rd_txbuf = m; 395 break; 396 } 397 } else { 398 dlc->rd_txbuf = NULL; 399 len = m->m_pkthdr.len; 400 } 401 } 402 403 DPRINTFN(10, "dlci %d send %d bytes, %d credits, rxcred = %d\n", 404 dlc->rd_dlci, len, credits, dlc->rd_rxcred); 405 406 if (rfcomm_session_send_uih(rs, dlc, credits, m)) { 407 printf("%s: lost %d bytes on DLCI %d\n", 408 __func__, len, dlc->rd_dlci); 409 410 break; 411 } 412 413 dlc->rd_pending++; 414 415 if (rs->rs_flags & RFCOMM_SESSION_CFC) { 416 if (len > 0) 417 dlc->rd_txcred--; 418 419 if (credits > 0) 420 dlc->rd_rxcred += credits; 421 } 422 } 423 } 424
Indexes created Fri Sep 26 20:09:58 GMT 2025