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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 | /* CMTP implementation for Linux Bluetooth stack (BlueZ). Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS SOFTWARE IS DISCLAIMED. */ #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/fcntl.h> #include <linux/freezer.h> #include <linux/skbuff.h> #include <linux/socket.h> #include <linux/ioctl.h> #include <linux/file.h> #include <linux/init.h> #include <linux/kthread.h> #include <net/sock.h> #include <linux/isdn/capilli.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/l2cap.h> #include "cmtp.h" #define VERSION "1.0" static DECLARE_RWSEM(cmtp_session_sem); static LIST_HEAD(cmtp_session_list); static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) { struct cmtp_session *session; BT_DBG(""); list_for_each_entry(session, &cmtp_session_list, list) if (!bacmp(bdaddr, &session->bdaddr)) return session; return NULL; } static void __cmtp_link_session(struct cmtp_session *session) { list_add(&session->list, &cmtp_session_list); } static void __cmtp_unlink_session(struct cmtp_session *session) { list_del(&session->list); } static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) { u32 valid_flags = BIT(CMTP_LOOPBACK); memset(ci, 0, sizeof(*ci)); bacpy(&ci->bdaddr, &session->bdaddr); ci->flags = session->flags & valid_flags; ci->state = session->state; ci->num = session->num; } static inline int cmtp_alloc_block_id(struct cmtp_session *session) { int i, id = -1; for (i = 0; i < 16; i++) if (!test_and_set_bit(i, &session->blockids)) { id = i; break; } return id; } static inline void cmtp_free_block_id(struct cmtp_session *session, int id) { clear_bit(id, &session->blockids); } static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) { struct sk_buff *skb = session->reassembly[id], *nskb; int size; BT_DBG("session %p buf %p count %d", session, buf, count); size = (skb) ? skb->len + count : count; nskb = alloc_skb(size, GFP_ATOMIC); if (!nskb) { BT_ERR("Can't allocate memory for CAPI message"); return; } if (skb && (skb->len > 0)) skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len); skb_put_data(nskb, buf, count); session->reassembly[id] = nskb; kfree_skb(skb); } static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) { __u8 hdr, hdrlen, id; __u16 len; BT_DBG("session %p skb %p len %d", session, skb, skb->len); while (skb->len > 0) { hdr = skb->data[0]; switch (hdr & 0xc0) { case 0x40: hdrlen = 2; len = skb->data[1]; break; case 0x80: hdrlen = 3; len = skb->data[1] | (skb->data[2] << 8); break; default: hdrlen = 1; len = 0; break; } id = (hdr & 0x3c) >> 2; BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); if (hdrlen + len > skb->len) { BT_ERR("Wrong size or header information in CMTP frame"); break; } if (len == 0) { skb_pull(skb, hdrlen); continue; } switch (hdr & 0x03) { case 0x00: cmtp_add_msgpart(session, id, skb->data + hdrlen, len); cmtp_recv_capimsg(session, session->reassembly[id]); session->reassembly[id] = NULL; break; case 0x01: cmtp_add_msgpart(session, id, skb->data + hdrlen, len); break; default: kfree_skb(session->reassembly[id]); session->reassembly[id] = NULL; break; } skb_pull(skb, hdrlen + len); } kfree_skb(skb); return 0; } static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) { struct socket *sock = session->sock; struct kvec iv = { data, len }; struct msghdr msg; BT_DBG("session %p data %p len %d", session, data, len); if (!len) return 0; memset(&msg, 0, sizeof(msg)); return kernel_sendmsg(sock, &msg, &iv, 1, len); } static void cmtp_process_transmit(struct cmtp_session *session) { struct sk_buff *skb, *nskb; unsigned char *hdr; unsigned int size, tail; BT_DBG("session %p", session); nskb = alloc_skb(session->mtu, GFP_ATOMIC); if (!nskb) { BT_ERR("Can't allocate memory for new frame"); return; } while ((skb = skb_dequeue(&session->transmit))) { struct cmtp_scb *scb = (void *) skb->cb; tail = session->mtu - nskb->len; if (tail < 5) { cmtp_send_frame(session, nskb->data, nskb->len); skb_trim(nskb, 0); tail = session->mtu; } size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); if (scb->id < 0) { scb->id = cmtp_alloc_block_id(session); if (scb->id < 0) { skb_queue_head(&session->transmit, skb); break; } } if (size < 256) { hdr = skb_put(nskb, 2); hdr[0] = 0x40 | ((scb->id << 2) & 0x3c) | ((skb->len == size) ? 0x00 : 0x01); hdr[1] = size; } else { hdr = skb_put(nskb, 3); hdr[0] = 0x80 | ((scb->id << 2) & 0x3c) | ((skb->len == size) ? 0x00 : 0x01); hdr[1] = size & 0xff; hdr[2] = size >> 8; } skb_copy_from_linear_data(skb, skb_put(nskb, size), size); skb_pull(skb, size); if (skb->len > 0) { skb_queue_head(&session->transmit, skb); } else { cmtp_free_block_id(session, scb->id); if (scb->data) { cmtp_send_frame(session, nskb->data, nskb->len); skb_trim(nskb, 0); } kfree_skb(skb); } } cmtp_send_frame(session, nskb->data, nskb->len); kfree_skb(nskb); } static int cmtp_session(void *arg) { struct cmtp_session *session = arg; struct sock *sk = session->sock->sk; struct sk_buff *skb; DEFINE_WAIT_FUNC(wait, woken_wake_function); BT_DBG("session %p", session); set_user_nice(current, -15); add_wait_queue(sk_sleep(sk), &wait); while (1) { if (atomic_read(&session->terminate)) break; if (sk->sk_state != BT_CONNECTED) break; while ((skb = skb_dequeue(&sk->sk_receive_queue))) { skb_orphan(skb); if (!skb_linearize(skb)) cmtp_recv_frame(session, skb); else kfree_skb(skb); } cmtp_process_transmit(session); /* * wait_woken() performs the necessary memory barriers * for us; see the header comment for this primitive. */ wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); } remove_wait_queue(sk_sleep(sk), &wait); down_write(&cmtp_session_sem); if (!(session->flags & BIT(CMTP_LOOPBACK))) cmtp_detach_device(session); fput(session->sock->file); __cmtp_unlink_session(session); up_write(&cmtp_session_sem); kfree(session); module_put_and_kthread_exit(0); return 0; } int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) { u32 valid_flags = BIT(CMTP_LOOPBACK); struct cmtp_session *session, *s; int i, err; BT_DBG(""); if (!l2cap_is_socket(sock)) return -EBADFD; if (req->flags & ~valid_flags) return -EINVAL; session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); if (!session) return -ENOMEM; down_write(&cmtp_session_sem); s = __cmtp_get_session(&l2cap_pi(sock->sk)->chan->dst); if (s && s->state == BT_CONNECTED) { err = -EEXIST; goto failed; } bacpy(&session->bdaddr, &l2cap_pi(sock->sk)->chan->dst); session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu, l2cap_pi(sock->sk)->chan->imtu); BT_DBG("mtu %d", session->mtu); sprintf(session->name, "%pMR", &session->bdaddr); session->sock = sock; session->state = BT_CONFIG; init_waitqueue_head(&session->wait); session->msgnum = CMTP_INITIAL_MSGNUM; INIT_LIST_HEAD(&session->applications); skb_queue_head_init(&session->transmit); for (i = 0; i < 16; i++) session->reassembly[i] = NULL; session->flags = req->flags; __cmtp_link_session(session); __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num); if (IS_ERR(session->task)) { module_put(THIS_MODULE); err = PTR_ERR(session->task); goto unlink; } if (!(session->flags & BIT(CMTP_LOOPBACK))) { err = cmtp_attach_device(session); if (err < 0) { /* Caller will call fput in case of failure, and so * will cmtp_session kthread. */ get_file(session->sock->file); atomic_inc(&session->terminate); wake_up_interruptible(sk_sleep(session->sock->sk)); up_write(&cmtp_session_sem); return err; } } up_write(&cmtp_session_sem); return 0; unlink: __cmtp_unlink_session(session); failed: up_write(&cmtp_session_sem); kfree(session); return err; } int cmtp_del_connection(struct cmtp_conndel_req *req) { u32 valid_flags = 0; struct cmtp_session *session; int err = 0; BT_DBG(""); if (req->flags & ~valid_flags) return -EINVAL; down_read(&cmtp_session_sem); session = __cmtp_get_session(&req->bdaddr); if (session) { /* Flush the transmit queue */ skb_queue_purge(&session->transmit); /* Stop session thread */ atomic_inc(&session->terminate); /* * See the comment preceding the call to wait_woken() * in cmtp_session(). */ wake_up_interruptible(sk_sleep(session->sock->sk)); } else err = -ENOENT; up_read(&cmtp_session_sem); return err; } int cmtp_get_connlist(struct cmtp_connlist_req *req) { struct cmtp_session *session; int err = 0, n = 0; BT_DBG(""); down_read(&cmtp_session_sem); list_for_each_entry(session, &cmtp_session_list, list) { struct cmtp_conninfo ci; __cmtp_copy_session(session, &ci); if (copy_to_user(req->ci, &ci, sizeof(ci))) { err = -EFAULT; break; } if (++n >= req->cnum) break; req->ci++; } req->cnum = n; up_read(&cmtp_session_sem); return err; } int cmtp_get_conninfo(struct cmtp_conninfo *ci) { struct cmtp_session *session; int err = 0; down_read(&cmtp_session_sem); session = __cmtp_get_session(&ci->bdaddr); if (session) __cmtp_copy_session(session, ci); else err = -ENOENT; up_read(&cmtp_session_sem); return err; } static int __init cmtp_init(void) { BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); return cmtp_init_sockets(); } static void __exit cmtp_exit(void) { cmtp_cleanup_sockets(); } module_init(cmtp_init); module_exit(cmtp_exit); MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL"); MODULE_ALIAS("bt-proto-5"); |