Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | CMTP implementation for Linux Bluetooth stack (BlueZ). |
| 3 | Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org> |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License version 2 as |
| 7 | published by the Free Software Foundation; |
| 8 | |
| 9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
| 12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
| 13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
| 14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | |
| 18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
| 19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
| 20 | SOFTWARE IS DISCLAIMED. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/config.h> |
| 24 | #include <linux/module.h> |
| 25 | |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/sched.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/poll.h> |
| 32 | #include <linux/fcntl.h> |
| 33 | #include <linux/skbuff.h> |
| 34 | #include <linux/socket.h> |
| 35 | #include <linux/ioctl.h> |
| 36 | #include <linux/file.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <net/sock.h> |
| 39 | |
| 40 | #include <linux/isdn/capilli.h> |
| 41 | |
| 42 | #include <net/bluetooth/bluetooth.h> |
| 43 | #include <net/bluetooth/l2cap.h> |
| 44 | |
| 45 | #include "cmtp.h" |
| 46 | |
| 47 | #ifndef CONFIG_BT_CMTP_DEBUG |
| 48 | #undef BT_DBG |
| 49 | #define BT_DBG(D...) |
| 50 | #endif |
| 51 | |
| 52 | #define VERSION "1.0" |
| 53 | |
| 54 | static DECLARE_RWSEM(cmtp_session_sem); |
| 55 | static LIST_HEAD(cmtp_session_list); |
| 56 | |
| 57 | static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) |
| 58 | { |
| 59 | struct cmtp_session *session; |
| 60 | struct list_head *p; |
| 61 | |
| 62 | BT_DBG(""); |
| 63 | |
| 64 | list_for_each(p, &cmtp_session_list) { |
| 65 | session = list_entry(p, struct cmtp_session, list); |
| 66 | if (!bacmp(bdaddr, &session->bdaddr)) |
| 67 | return session; |
| 68 | } |
| 69 | return NULL; |
| 70 | } |
| 71 | |
| 72 | static void __cmtp_link_session(struct cmtp_session *session) |
| 73 | { |
| 74 | __module_get(THIS_MODULE); |
| 75 | list_add(&session->list, &cmtp_session_list); |
| 76 | } |
| 77 | |
| 78 | static void __cmtp_unlink_session(struct cmtp_session *session) |
| 79 | { |
| 80 | list_del(&session->list); |
| 81 | module_put(THIS_MODULE); |
| 82 | } |
| 83 | |
| 84 | static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) |
| 85 | { |
| 86 | bacpy(&ci->bdaddr, &session->bdaddr); |
| 87 | |
| 88 | ci->flags = session->flags; |
| 89 | ci->state = session->state; |
| 90 | |
| 91 | ci->num = session->num; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) |
| 96 | { |
| 97 | int i, id = -1; |
| 98 | |
| 99 | for (i = 0; i < 16; i++) |
| 100 | if (!test_and_set_bit(i, &session->blockids)) { |
| 101 | id = i; |
| 102 | break; |
| 103 | } |
| 104 | |
| 105 | return id; |
| 106 | } |
| 107 | |
| 108 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) |
| 109 | { |
| 110 | clear_bit(id, &session->blockids); |
| 111 | } |
| 112 | |
| 113 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) |
| 114 | { |
| 115 | struct sk_buff *skb = session->reassembly[id], *nskb; |
| 116 | int size; |
| 117 | |
| 118 | BT_DBG("session %p buf %p count %d", session, buf, count); |
| 119 | |
| 120 | size = (skb) ? skb->len + count : count; |
| 121 | |
| 122 | if (!(nskb = alloc_skb(size, GFP_ATOMIC))) { |
| 123 | BT_ERR("Can't allocate memory for CAPI message"); |
| 124 | return; |
| 125 | } |
| 126 | |
| 127 | if (skb && (skb->len > 0)) |
| 128 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); |
| 129 | |
| 130 | memcpy(skb_put(nskb, count), buf, count); |
| 131 | |
| 132 | session->reassembly[id] = nskb; |
| 133 | |
| 134 | if (skb) |
| 135 | kfree_skb(skb); |
| 136 | } |
| 137 | |
| 138 | static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) |
| 139 | { |
| 140 | __u8 hdr, hdrlen, id; |
| 141 | __u16 len; |
| 142 | |
| 143 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); |
| 144 | |
| 145 | while (skb->len > 0) { |
| 146 | hdr = skb->data[0]; |
| 147 | |
| 148 | switch (hdr & 0xc0) { |
| 149 | case 0x40: |
| 150 | hdrlen = 2; |
| 151 | len = skb->data[1]; |
| 152 | break; |
| 153 | case 0x80: |
| 154 | hdrlen = 3; |
| 155 | len = skb->data[1] | (skb->data[2] << 8); |
| 156 | break; |
| 157 | default: |
| 158 | hdrlen = 1; |
| 159 | len = 0; |
| 160 | break; |
| 161 | } |
| 162 | |
| 163 | id = (hdr & 0x3c) >> 2; |
| 164 | |
| 165 | BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); |
| 166 | |
| 167 | if (hdrlen + len > skb->len) { |
| 168 | BT_ERR("Wrong size or header information in CMTP frame"); |
| 169 | break; |
| 170 | } |
| 171 | |
| 172 | if (len == 0) { |
| 173 | skb_pull(skb, hdrlen); |
| 174 | continue; |
| 175 | } |
| 176 | |
| 177 | switch (hdr & 0x03) { |
| 178 | case 0x00: |
| 179 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); |
| 180 | cmtp_recv_capimsg(session, session->reassembly[id]); |
| 181 | session->reassembly[id] = NULL; |
| 182 | break; |
| 183 | case 0x01: |
| 184 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); |
| 185 | break; |
| 186 | default: |
| 187 | if (session->reassembly[id] != NULL) |
| 188 | kfree_skb(session->reassembly[id]); |
| 189 | session->reassembly[id] = NULL; |
| 190 | break; |
| 191 | } |
| 192 | |
| 193 | skb_pull(skb, hdrlen + len); |
| 194 | } |
| 195 | |
| 196 | kfree_skb(skb); |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) |
| 201 | { |
| 202 | struct socket *sock = session->sock; |
| 203 | struct kvec iv = { data, len }; |
| 204 | struct msghdr msg; |
| 205 | |
| 206 | BT_DBG("session %p data %p len %d", session, data, len); |
| 207 | |
| 208 | if (!len) |
| 209 | return 0; |
| 210 | |
| 211 | memset(&msg, 0, sizeof(msg)); |
| 212 | |
| 213 | return kernel_sendmsg(sock, &msg, &iv, 1, len); |
| 214 | } |
| 215 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame^] | 216 | static void cmtp_process_transmit(struct cmtp_session *session) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | { |
| 218 | struct sk_buff *skb, *nskb; |
| 219 | unsigned char *hdr; |
| 220 | unsigned int size, tail; |
| 221 | |
| 222 | BT_DBG("session %p", session); |
| 223 | |
| 224 | if (!(nskb = alloc_skb(session->mtu, GFP_ATOMIC))) { |
| 225 | BT_ERR("Can't allocate memory for new frame"); |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame^] | 226 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | while ((skb = skb_dequeue(&session->transmit))) { |
| 230 | struct cmtp_scb *scb = (void *) skb->cb; |
| 231 | |
| 232 | if ((tail = (session->mtu - nskb->len)) < 5) { |
| 233 | cmtp_send_frame(session, nskb->data, nskb->len); |
| 234 | skb_trim(nskb, 0); |
| 235 | tail = session->mtu; |
| 236 | } |
| 237 | |
| 238 | size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); |
| 239 | |
| 240 | if ((scb->id < 0) && ((scb->id = cmtp_alloc_block_id(session)) < 0)) { |
| 241 | skb_queue_head(&session->transmit, skb); |
| 242 | break; |
| 243 | } |
| 244 | |
| 245 | if (size < 256) { |
| 246 | hdr = skb_put(nskb, 2); |
| 247 | hdr[0] = 0x40 |
| 248 | | ((scb->id << 2) & 0x3c) |
| 249 | | ((skb->len == size) ? 0x00 : 0x01); |
| 250 | hdr[1] = size; |
| 251 | } else { |
| 252 | hdr = skb_put(nskb, 3); |
| 253 | hdr[0] = 0x80 |
| 254 | | ((scb->id << 2) & 0x3c) |
| 255 | | ((skb->len == size) ? 0x00 : 0x01); |
| 256 | hdr[1] = size & 0xff; |
| 257 | hdr[2] = size >> 8; |
| 258 | } |
| 259 | |
| 260 | memcpy(skb_put(nskb, size), skb->data, size); |
| 261 | skb_pull(skb, size); |
| 262 | |
| 263 | if (skb->len > 0) { |
| 264 | skb_queue_head(&session->transmit, skb); |
| 265 | } else { |
| 266 | cmtp_free_block_id(session, scb->id); |
| 267 | if (scb->data) { |
| 268 | cmtp_send_frame(session, nskb->data, nskb->len); |
| 269 | skb_trim(nskb, 0); |
| 270 | } |
| 271 | kfree_skb(skb); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | cmtp_send_frame(session, nskb->data, nskb->len); |
| 276 | |
| 277 | kfree_skb(nskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static int cmtp_session(void *arg) |
| 281 | { |
| 282 | struct cmtp_session *session = arg; |
| 283 | struct sock *sk = session->sock->sk; |
| 284 | struct sk_buff *skb; |
| 285 | wait_queue_t wait; |
| 286 | |
| 287 | BT_DBG("session %p", session); |
| 288 | |
| 289 | daemonize("kcmtpd_ctr_%d", session->num); |
| 290 | set_user_nice(current, -15); |
| 291 | current->flags |= PF_NOFREEZE; |
| 292 | |
| 293 | init_waitqueue_entry(&wait, current); |
| 294 | add_wait_queue(sk->sk_sleep, &wait); |
| 295 | while (!atomic_read(&session->terminate)) { |
| 296 | set_current_state(TASK_INTERRUPTIBLE); |
| 297 | |
| 298 | if (sk->sk_state != BT_CONNECTED) |
| 299 | break; |
| 300 | |
| 301 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { |
| 302 | skb_orphan(skb); |
| 303 | cmtp_recv_frame(session, skb); |
| 304 | } |
| 305 | |
| 306 | cmtp_process_transmit(session); |
| 307 | |
| 308 | schedule(); |
| 309 | } |
| 310 | set_current_state(TASK_RUNNING); |
| 311 | remove_wait_queue(sk->sk_sleep, &wait); |
| 312 | |
| 313 | down_write(&cmtp_session_sem); |
| 314 | |
| 315 | if (!(session->flags & (1 << CMTP_LOOPBACK))) |
| 316 | cmtp_detach_device(session); |
| 317 | |
| 318 | fput(session->sock->file); |
| 319 | |
| 320 | __cmtp_unlink_session(session); |
| 321 | |
| 322 | up_write(&cmtp_session_sem); |
| 323 | |
| 324 | kfree(session); |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) |
| 329 | { |
| 330 | struct cmtp_session *session, *s; |
| 331 | bdaddr_t src, dst; |
| 332 | int i, err; |
| 333 | |
| 334 | BT_DBG(""); |
| 335 | |
| 336 | baswap(&src, &bt_sk(sock->sk)->src); |
| 337 | baswap(&dst, &bt_sk(sock->sk)->dst); |
| 338 | |
| 339 | session = kmalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
| 340 | if (!session) |
| 341 | return -ENOMEM; |
| 342 | memset(session, 0, sizeof(struct cmtp_session)); |
| 343 | |
| 344 | down_write(&cmtp_session_sem); |
| 345 | |
| 346 | s = __cmtp_get_session(&bt_sk(sock->sk)->dst); |
| 347 | if (s && s->state == BT_CONNECTED) { |
| 348 | err = -EEXIST; |
| 349 | goto failed; |
| 350 | } |
| 351 | |
| 352 | bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst); |
| 353 | |
| 354 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->omtu, l2cap_pi(sock->sk)->imtu); |
| 355 | |
| 356 | BT_DBG("mtu %d", session->mtu); |
| 357 | |
| 358 | sprintf(session->name, "%s", batostr(&dst)); |
| 359 | |
| 360 | session->sock = sock; |
| 361 | session->state = BT_CONFIG; |
| 362 | |
| 363 | init_waitqueue_head(&session->wait); |
| 364 | |
| 365 | session->msgnum = CMTP_INITIAL_MSGNUM; |
| 366 | |
| 367 | INIT_LIST_HEAD(&session->applications); |
| 368 | |
| 369 | skb_queue_head_init(&session->transmit); |
| 370 | |
| 371 | for (i = 0; i < 16; i++) |
| 372 | session->reassembly[i] = NULL; |
| 373 | |
| 374 | session->flags = req->flags; |
| 375 | |
| 376 | __cmtp_link_session(session); |
| 377 | |
| 378 | err = kernel_thread(cmtp_session, session, CLONE_KERNEL); |
| 379 | if (err < 0) |
| 380 | goto unlink; |
| 381 | |
| 382 | if (!(session->flags & (1 << CMTP_LOOPBACK))) { |
| 383 | err = cmtp_attach_device(session); |
| 384 | if (err < 0) |
| 385 | goto detach; |
| 386 | } |
| 387 | |
| 388 | up_write(&cmtp_session_sem); |
| 389 | return 0; |
| 390 | |
| 391 | detach: |
| 392 | cmtp_detach_device(session); |
| 393 | |
| 394 | unlink: |
| 395 | __cmtp_unlink_session(session); |
| 396 | |
| 397 | failed: |
| 398 | up_write(&cmtp_session_sem); |
| 399 | kfree(session); |
| 400 | return err; |
| 401 | } |
| 402 | |
| 403 | int cmtp_del_connection(struct cmtp_conndel_req *req) |
| 404 | { |
| 405 | struct cmtp_session *session; |
| 406 | int err = 0; |
| 407 | |
| 408 | BT_DBG(""); |
| 409 | |
| 410 | down_read(&cmtp_session_sem); |
| 411 | |
| 412 | session = __cmtp_get_session(&req->bdaddr); |
| 413 | if (session) { |
| 414 | /* Flush the transmit queue */ |
| 415 | skb_queue_purge(&session->transmit); |
| 416 | |
| 417 | /* Kill session thread */ |
| 418 | atomic_inc(&session->terminate); |
| 419 | cmtp_schedule(session); |
| 420 | } else |
| 421 | err = -ENOENT; |
| 422 | |
| 423 | up_read(&cmtp_session_sem); |
| 424 | return err; |
| 425 | } |
| 426 | |
| 427 | int cmtp_get_connlist(struct cmtp_connlist_req *req) |
| 428 | { |
| 429 | struct list_head *p; |
| 430 | int err = 0, n = 0; |
| 431 | |
| 432 | BT_DBG(""); |
| 433 | |
| 434 | down_read(&cmtp_session_sem); |
| 435 | |
| 436 | list_for_each(p, &cmtp_session_list) { |
| 437 | struct cmtp_session *session; |
| 438 | struct cmtp_conninfo ci; |
| 439 | |
| 440 | session = list_entry(p, struct cmtp_session, list); |
| 441 | |
| 442 | __cmtp_copy_session(session, &ci); |
| 443 | |
| 444 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { |
| 445 | err = -EFAULT; |
| 446 | break; |
| 447 | } |
| 448 | |
| 449 | if (++n >= req->cnum) |
| 450 | break; |
| 451 | |
| 452 | req->ci++; |
| 453 | } |
| 454 | req->cnum = n; |
| 455 | |
| 456 | up_read(&cmtp_session_sem); |
| 457 | return err; |
| 458 | } |
| 459 | |
| 460 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) |
| 461 | { |
| 462 | struct cmtp_session *session; |
| 463 | int err = 0; |
| 464 | |
| 465 | down_read(&cmtp_session_sem); |
| 466 | |
| 467 | session = __cmtp_get_session(&ci->bdaddr); |
| 468 | if (session) |
| 469 | __cmtp_copy_session(session, ci); |
| 470 | else |
| 471 | err = -ENOENT; |
| 472 | |
| 473 | up_read(&cmtp_session_sem); |
| 474 | return err; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | static int __init cmtp_init(void) |
| 479 | { |
| 480 | l2cap_load(); |
| 481 | |
| 482 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); |
| 483 | |
| 484 | cmtp_init_sockets(); |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static void __exit cmtp_exit(void) |
| 490 | { |
| 491 | cmtp_cleanup_sockets(); |
| 492 | } |
| 493 | |
| 494 | module_init(cmtp_init); |
| 495 | module_exit(cmtp_exit); |
| 496 | |
| 497 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
| 498 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); |
| 499 | MODULE_VERSION(VERSION); |
| 500 | MODULE_LICENSE("GPL"); |
| 501 | MODULE_ALIAS("bt-proto-5"); |