1 /* $OpenBSD: src/sys/netbt/rfcomm_dlc.c,v 1.2 2008/02/24 21:34:48 uwe Exp $ */ 2 /* $NetBSD: rfcomm_dlc.c,v 1.4 2007/11/03 17:20:17 plunky Exp $ */ 3 4 /*- 5 * Copyright (c) 2006 Itronix Inc. 6 * All rights reserved. 7 * 8 * Written by Iain Hibbert for Itronix Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of Itronix Inc. may not be used to endorse 19 * or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 26 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/proc.h> 40 #include <sys/systm.h> 41 #include <sys/endian.h> 42 43 #include <netbt/bluetooth.h> 44 #include <netbt/hci.h> 45 #include <netbt/l2cap.h> 46 #include <netbt/rfcomm.h> 47 48 /* 49 * rfcomm_dlc_lookup(rfcomm_session, dlci) 50 * 51 * Find DLC on session with matching dlci 52 */ 53 struct rfcomm_dlc * 54 rfcomm_dlc_lookup(struct rfcomm_session *rs, int dlci) 55 { 56 struct rfcomm_dlc *dlc; 57 58 LIST_FOREACH(dlc, &rs->rs_dlcs, rd_next) { 59 if (dlc->rd_dlci == dlci) 60 break; 61 } 62 63 return dlc; 64 } 65 66 /* 67 * rfcomm_dlc_newconn(rfcomm_session, dlci) 68 * 69 * handle a new dlc request (since its called from a couple of places) 70 */ 71 struct rfcomm_dlc * 72 rfcomm_dlc_newconn(struct rfcomm_session *rs, int dlci) 73 { 74 struct rfcomm_session *ls; 75 struct rfcomm_dlc *new, *dlc, *any, *best; 76 struct sockaddr_bt laddr, raddr, addr; 77 int chan; 78 79 /* 80 * Search amongst the listening DLC community for the best match for 81 * address & channel. We keep listening DLC's hanging on listening 82 * sessions in a last first order, so scan the entire bunch and keep 83 * a note of the best address and BDADDR_ANY matches in order to find 84 * the oldest and most specific match. 85 */ 86 l2cap_sockaddr(rs->rs_l2cap, &laddr); 87 l2cap_peeraddr(rs->rs_l2cap, &raddr); 88 chan = RFCOMM_CHANNEL(dlci); 89 new = NULL; 90 91 any = best = NULL; 92 LIST_FOREACH(ls, &rfcomm_session_listen, rs_next) { 93 l2cap_sockaddr(ls->rs_l2cap, &addr); 94 95 if (addr.bt_psm != laddr.bt_psm) 96 continue; 97 98 if (bdaddr_same(&laddr.bt_bdaddr, &addr.bt_bdaddr)) { 99 LIST_FOREACH(dlc, &ls->rs_dlcs, rd_next) { 100 if (dlc->rd_laddr.bt_channel == chan) 101 best = dlc; 102 } 103 } 104 105 if (bdaddr_any(&addr.bt_bdaddr)) { 106 LIST_FOREACH(dlc, &ls->rs_dlcs, rd_next) { 107 if (dlc->rd_laddr.bt_channel == chan) 108 any = dlc; 109 } 110 } 111 } 112 113 dlc = best ? best : any; 114 115 /* XXX 116 * Note that if this fails, we could have missed a chance to open 117 * a connection - really need to rewrite the strategy for storing 118 * listening DLC's so all can be checked in turn.. 119 */ 120 if (dlc != NULL) 121 new = (*dlc->rd_proto->newconn)(dlc->rd_upper, &laddr, &raddr); 122 123 if (new == NULL) { 124 rfcomm_session_send_frame(rs, RFCOMM_FRAME_DM, dlci); 125 return NULL; 126 } 127 128 new->rd_dlci = dlci; 129 new->rd_mtu = rfcomm_mtu_default; 130 new->rd_mode = dlc->rd_mode; 131 132 memcpy(&new->rd_laddr, &laddr, sizeof(struct sockaddr_bt)); 133 new->rd_laddr.bt_channel = chan; 134 135 memcpy(&new->rd_raddr, &raddr, sizeof(struct sockaddr_bt)); 136 new->rd_raddr.bt_channel = chan; 137 138 new->rd_session = rs; 139 new->rd_state = RFCOMM_DLC_WAIT_CONNECT; 140 LIST_INSERT_HEAD(&rs->rs_dlcs, new, rd_next); 141 142 return new; 143 } 144 145 /* 146 * rfcomm_dlc_close(dlc, error) 147 * 148 * detach DLC from session and clean up 149 */ 150 void 151 rfcomm_dlc_close(struct rfcomm_dlc *dlc, int err) 152 { 153 struct rfcomm_session *rs; 154 struct rfcomm_credit *credit; 155 156 KKASSERT(dlc->rd_state != RFCOMM_DLC_CLOSED); 157 158 /* Clear credit history */ 159 rs = dlc->rd_session; 160 STAILQ_FOREACH(credit, &rs->rs_credits, rc_next) 161 if (credit->rc_dlc == dlc) 162 credit->rc_dlc = NULL; 163 164 callout_stop(&dlc->rd_timeout); 165 166 LIST_REMOVE(dlc, rd_next); 167 dlc->rd_session = NULL; 168 dlc->rd_state = RFCOMM_DLC_CLOSED; 169 170 (*dlc->rd_proto->disconnected)(dlc->rd_upper, err); 171 172 /* 173 * It is the responsibility of the party who sends the last 174 * DISC(dlci) to disconnect the session, but we will schedule 175 * an expiry just in case that doesnt happen.. 176 */ 177 if (LIST_EMPTY(&rs->rs_dlcs)) { 178 if (rs->rs_state == RFCOMM_SESSION_LISTEN) 179 rfcomm_session_free(rs); 180 else 181 callout_reset(&rs->rs_timeout, rfcomm_ack_timeout * hz, 182 rfcomm_session_timeout, rs); 183 } 184 } 185 186 /* 187 * rfcomm_dlc_timeout(dlc) 188 * 189 * DLC timeout function is schedUled when we sent any of SABM, 190 * DISC, MCC_MSC, or MCC_PN and should be cancelled when we get 191 * the relevant response. There is nothing to do but shut this 192 * DLC down. 193 */ 194 void 195 rfcomm_dlc_timeout(void *arg) 196 { 197 struct rfcomm_dlc *dlc = arg; 198 199 crit_enter(); 200 201 if (dlc->rd_state != RFCOMM_DLC_CLOSED) 202 rfcomm_dlc_close(dlc, ETIMEDOUT); 203 else if (dlc->rd_flags & RFCOMM_DLC_DETACH) 204 kfree(dlc, M_BLUETOOTH); 205 206 crit_exit(); 207 } 208 209 /* 210 * rfcomm_dlc_setmode(rfcomm_dlc) 211 * 212 * Set link mode for DLC. This is only called when the session is 213 * already open, so we don't need to worry about any previous mode 214 * settings. 215 */ 216 int 217 rfcomm_dlc_setmode(struct rfcomm_dlc *dlc) 218 { 219 int mode = 0; 220 221 KKASSERT(dlc->rd_session != NULL); 222 KKASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 223 224 DPRINTF("dlci %d, auth %s, encrypt %s, secure %s\n", dlc->rd_dlci, 225 (dlc->rd_mode & RFCOMM_LM_AUTH ? "yes" : "no"), 226 (dlc->rd_mode & RFCOMM_LM_ENCRYPT ? "yes" : "no"), 227 (dlc->rd_mode & RFCOMM_LM_SECURE ? "yes" : "no")); 228 229 if (dlc->rd_mode & RFCOMM_LM_AUTH) 230 mode |= L2CAP_LM_AUTH; 231 232 if (dlc->rd_mode & RFCOMM_LM_ENCRYPT) 233 mode |= L2CAP_LM_ENCRYPT; 234 235 if (dlc->rd_mode & RFCOMM_LM_SECURE) 236 mode |= L2CAP_LM_SECURE; 237 238 return l2cap_setopt(dlc->rd_session->rs_l2cap, SO_L2CAP_LM, &mode); 239 } 240 241 /* 242 * rfcomm_dlc_connect(rfcomm_dlc) 243 * 244 * initiate DLC connection (session is already connected) 245 */ 246 int 247 rfcomm_dlc_connect(struct rfcomm_dlc *dlc) 248 { 249 struct rfcomm_mcc_pn pn; 250 int err = 0; 251 252 KKASSERT(dlc->rd_session != NULL); 253 KKASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 254 KKASSERT(dlc->rd_state == RFCOMM_DLC_WAIT_SESSION); 255 256 /* 257 * If we have not already sent a PN on the session, we must send 258 * a PN to negotiate Credit Flow Control, and this setting will 259 * apply to all future connections for this session. We ask for 260 * this every time, in order to establish initial credits. 261 */ 262 memset(&pn, 0, sizeof(pn)); 263 pn.dlci = dlc->rd_dlci; 264 pn.priority = dlc->rd_dlci | 0x07; 265 pn.mtu = htole16(dlc->rd_mtu); 266 267 pn.flow_control = 0xf0; 268 dlc->rd_rxcred = (dlc->rd_rxsize / dlc->rd_mtu); 269 dlc->rd_rxcred = min(dlc->rd_rxcred, RFCOMM_CREDITS_DEFAULT); 270 pn.credits = dlc->rd_rxcred; 271 272 err = rfcomm_session_send_mcc(dlc->rd_session, 1, 273 RFCOMM_MCC_PN, &pn, sizeof(pn)); 274 if (err) 275 return err; 276 277 dlc->rd_state = RFCOMM_DLC_WAIT_CONNECT; 278 callout_reset(&dlc->rd_timeout, rfcomm_mcc_timeout * hz, 279 rfcomm_dlc_timeout, dlc); 280 return 0; 281 } 282 283 /* 284 * rfcomm_dlc_open(rfcomm_dlc) 285 * 286 * send "Modem Status Command" and mark DLC as open. 287 */ 288 int 289 rfcomm_dlc_open(struct rfcomm_dlc *dlc) 290 { 291 struct rfcomm_mcc_msc msc; 292 int err; 293 294 KKASSERT(dlc->rd_session != NULL); 295 KKASSERT(dlc->rd_session->rs_state == RFCOMM_SESSION_OPEN); 296 297 memset(&msc, 0, sizeof(msc)); 298 msc.address = RFCOMM_MKADDRESS(1, dlc->rd_dlci); 299 msc.modem = dlc->rd_lmodem & 0xfe; /* EA = 0 */ 300 msc.brk = 0x00 | 0x01; /* EA = 1 */ 301 302 err = rfcomm_session_send_mcc(dlc->rd_session, 1, 303 RFCOMM_MCC_MSC, &msc, sizeof(msc)); 304 if (err) 305 return err; 306 307 callout_reset(&dlc->rd_timeout, rfcomm_mcc_timeout * hz, 308 rfcomm_dlc_timeout, dlc); 309 310 dlc->rd_state = RFCOMM_DLC_OPEN; 311 (*dlc->rd_proto->connected)(dlc->rd_upper); 312 313 return 0; 314 } 315 316 /* 317 * rfcomm_dlc_start(rfcomm_dlc) 318 * 319 * Start sending data (and/or credits) for DLC. Our strategy is to 320 * send anything we can down to the l2cap layer. When credits run 321 * out, data will naturally bunch up. When not using credit flow 322 * control, we limit the number of packets we have pending to reduce 323 * flow control lag. 324 * We should deal with channel priority somehow. 325 */ 326 void 327 rfcomm_dlc_start(struct rfcomm_dlc *dlc) 328 { 329 struct rfcomm_session *rs = dlc->rd_session; 330 struct mbuf *m; 331 int len, credits; 332 333 KKASSERT(rs != NULL); 334 KKASSERT(rs->rs_state == RFCOMM_SESSION_OPEN); 335 KKASSERT(dlc->rd_state == RFCOMM_DLC_OPEN); 336 337 for (;;) { 338 credits = 0; 339 len = dlc->rd_mtu; 340 if (rs->rs_flags & RFCOMM_SESSION_CFC) { 341 credits = (dlc->rd_rxsize / dlc->rd_mtu); 342 credits -= dlc->rd_rxcred; 343 credits = min(credits, RFCOMM_CREDITS_MAX); 344 345 if (credits > 0) 346 len--; 347 348 if (dlc->rd_txcred == 0) 349 len = 0; 350 } else { 351 if (rs->rs_flags & RFCOMM_SESSION_RFC) 352 break; 353 354 if (dlc->rd_rmodem & RFCOMM_MSC_FC) 355 break; 356 357 if (dlc->rd_pending > RFCOMM_CREDITS_DEFAULT) 358 break; 359 } 360 361 if (dlc->rd_txbuf == NULL) 362 len = 0; 363 364 if (len == 0) { 365 if (credits == 0) 366 break; 367 368 /* 369 * No need to send small numbers of credits on their 370 * own unless the other end hasn't many left. 371 */ 372 if (credits < RFCOMM_CREDITS_DEFAULT 373 && dlc->rd_rxcred > RFCOMM_CREDITS_DEFAULT) 374 break; 375 376 m = NULL; 377 } else { 378 /* 379 * take what data we can from (front of) txbuf 380 */ 381 m = dlc->rd_txbuf; 382 if (len < m->m_pkthdr.len) { 383 dlc->rd_txbuf = m_split(m, len, M_NOWAIT); 384 if (dlc->rd_txbuf == NULL) { 385 dlc->rd_txbuf = m; 386 break; 387 } 388 } else { 389 dlc->rd_txbuf = NULL; 390 len = m->m_pkthdr.len; 391 } 392 } 393 394 DPRINTFN(10, "dlci %d send %d bytes, %d credits, rxcred = %d\n", 395 dlc->rd_dlci, len, credits, dlc->rd_rxcred); 396 397 if (rfcomm_session_send_uih(rs, dlc, credits, m)) { 398 kprintf("%s: lost %d bytes on DLCI %d\n", 399 __func__, len, dlc->rd_dlci); 400 401 break; 402 } 403 404 dlc->rd_pending++; 405 406 if (rs->rs_flags & RFCOMM_SESSION_CFC) { 407 if (len > 0) 408 dlc->rd_txcred--; 409 410 if (credits > 0) 411 dlc->rd_rxcred += credits; 412 } 413 } 414 } 415