Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | RFCOMM implementation for Linux Bluetooth stack (BlueZ). |
| 3 | Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> |
| 4 | Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License version 2 as |
| 8 | published by the Free Software Foundation; |
| 9 | |
| 10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
| 13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
| 14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
| 15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | |
| 19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
| 20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
| 21 | SOFTWARE IS DISCLAIMED. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * RFCOMM sockets. |
| 26 | * |
| 27 | * $Id: sock.c,v 1.24 2002/10/03 01:00:34 maxk Exp $ |
| 28 | */ |
| 29 | |
| 30 | #include <linux/config.h> |
| 31 | #include <linux/module.h> |
| 32 | |
| 33 | #include <linux/types.h> |
| 34 | #include <linux/errno.h> |
| 35 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/sched.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/poll.h> |
| 39 | #include <linux/fcntl.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/interrupt.h> |
| 42 | #include <linux/socket.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | #include <linux/list.h> |
| 45 | #include <linux/proc_fs.h> |
| 46 | #include <linux/seq_file.h> |
| 47 | #include <net/sock.h> |
| 48 | |
| 49 | #include <asm/system.h> |
| 50 | #include <asm/uaccess.h> |
| 51 | |
| 52 | #include <net/bluetooth/bluetooth.h> |
| 53 | #include <net/bluetooth/hci_core.h> |
| 54 | #include <net/bluetooth/l2cap.h> |
| 55 | #include <net/bluetooth/rfcomm.h> |
| 56 | |
| 57 | #ifndef CONFIG_BT_RFCOMM_DEBUG |
| 58 | #undef BT_DBG |
| 59 | #define BT_DBG(D...) |
| 60 | #endif |
| 61 | |
| 62 | static struct proto_ops rfcomm_sock_ops; |
| 63 | |
| 64 | static struct bt_sock_list rfcomm_sk_list = { |
| 65 | .lock = RW_LOCK_UNLOCKED |
| 66 | }; |
| 67 | |
| 68 | static void rfcomm_sock_close(struct sock *sk); |
| 69 | static void rfcomm_sock_kill(struct sock *sk); |
| 70 | |
| 71 | /* ---- DLC callbacks ---- |
| 72 | * |
| 73 | * called under rfcomm_dlc_lock() |
| 74 | */ |
| 75 | static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb) |
| 76 | { |
| 77 | struct sock *sk = d->owner; |
| 78 | if (!sk) |
| 79 | return; |
| 80 | |
| 81 | atomic_add(skb->len, &sk->sk_rmem_alloc); |
| 82 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 83 | sk->sk_data_ready(sk, skb->len); |
| 84 | |
| 85 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
| 86 | rfcomm_dlc_throttle(d); |
| 87 | } |
| 88 | |
| 89 | static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) |
| 90 | { |
| 91 | struct sock *sk = d->owner, *parent; |
| 92 | if (!sk) |
| 93 | return; |
| 94 | |
| 95 | BT_DBG("dlc %p state %ld err %d", d, d->state, err); |
| 96 | |
| 97 | bh_lock_sock(sk); |
| 98 | |
| 99 | if (err) |
| 100 | sk->sk_err = err; |
| 101 | |
| 102 | sk->sk_state = d->state; |
| 103 | |
| 104 | parent = bt_sk(sk)->parent; |
| 105 | if (parent) { |
| 106 | if (d->state == BT_CLOSED) { |
| 107 | sock_set_flag(sk, SOCK_ZAPPED); |
| 108 | bt_accept_unlink(sk); |
| 109 | } |
| 110 | parent->sk_data_ready(parent, 0); |
| 111 | } else { |
| 112 | if (d->state == BT_CONNECTED) |
| 113 | rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL); |
| 114 | sk->sk_state_change(sk); |
| 115 | } |
| 116 | |
| 117 | bh_unlock_sock(sk); |
| 118 | |
| 119 | if (parent && sock_flag(sk, SOCK_ZAPPED)) { |
| 120 | /* We have to drop DLC lock here, otherwise |
| 121 | * rfcomm_sock_destruct() will dead lock. */ |
| 122 | rfcomm_dlc_unlock(d); |
| 123 | rfcomm_sock_kill(sk); |
| 124 | rfcomm_dlc_lock(d); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* ---- Socket functions ---- */ |
| 129 | static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src) |
| 130 | { |
| 131 | struct sock *sk = NULL; |
| 132 | struct hlist_node *node; |
| 133 | |
| 134 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
| 135 | if (rfcomm_pi(sk)->channel == channel && |
| 136 | !bacmp(&bt_sk(sk)->src, src)) |
| 137 | break; |
| 138 | } |
| 139 | |
| 140 | return node ? sk : NULL; |
| 141 | } |
| 142 | |
| 143 | /* Find socket with channel and source bdaddr. |
| 144 | * Returns closest match. |
| 145 | */ |
| 146 | static struct sock *__rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) |
| 147 | { |
| 148 | struct sock *sk = NULL, *sk1 = NULL; |
| 149 | struct hlist_node *node; |
| 150 | |
| 151 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
| 152 | if (state && sk->sk_state != state) |
| 153 | continue; |
| 154 | |
| 155 | if (rfcomm_pi(sk)->channel == channel) { |
| 156 | /* Exact match. */ |
| 157 | if (!bacmp(&bt_sk(sk)->src, src)) |
| 158 | break; |
| 159 | |
| 160 | /* Closest match */ |
| 161 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) |
| 162 | sk1 = sk; |
| 163 | } |
| 164 | } |
| 165 | return node ? sk : sk1; |
| 166 | } |
| 167 | |
| 168 | /* Find socket with given address (channel, src). |
| 169 | * Returns locked socket */ |
| 170 | static inline struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) |
| 171 | { |
| 172 | struct sock *s; |
| 173 | read_lock(&rfcomm_sk_list.lock); |
| 174 | s = __rfcomm_get_sock_by_channel(state, channel, src); |
| 175 | if (s) bh_lock_sock(s); |
| 176 | read_unlock(&rfcomm_sk_list.lock); |
| 177 | return s; |
| 178 | } |
| 179 | |
| 180 | static void rfcomm_sock_destruct(struct sock *sk) |
| 181 | { |
| 182 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
| 183 | |
| 184 | BT_DBG("sk %p dlc %p", sk, d); |
| 185 | |
| 186 | skb_queue_purge(&sk->sk_receive_queue); |
| 187 | skb_queue_purge(&sk->sk_write_queue); |
| 188 | |
| 189 | rfcomm_dlc_lock(d); |
| 190 | rfcomm_pi(sk)->dlc = NULL; |
| 191 | |
| 192 | /* Detach DLC if it's owned by this socket */ |
| 193 | if (d->owner == sk) |
| 194 | d->owner = NULL; |
| 195 | rfcomm_dlc_unlock(d); |
| 196 | |
| 197 | rfcomm_dlc_put(d); |
| 198 | } |
| 199 | |
| 200 | static void rfcomm_sock_cleanup_listen(struct sock *parent) |
| 201 | { |
| 202 | struct sock *sk; |
| 203 | |
| 204 | BT_DBG("parent %p", parent); |
| 205 | |
| 206 | /* Close not yet accepted dlcs */ |
| 207 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
| 208 | rfcomm_sock_close(sk); |
| 209 | rfcomm_sock_kill(sk); |
| 210 | } |
| 211 | |
| 212 | parent->sk_state = BT_CLOSED; |
| 213 | sock_set_flag(parent, SOCK_ZAPPED); |
| 214 | } |
| 215 | |
| 216 | /* Kill socket (only if zapped and orphan) |
| 217 | * Must be called on unlocked socket. |
| 218 | */ |
| 219 | static void rfcomm_sock_kill(struct sock *sk) |
| 220 | { |
| 221 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) |
| 222 | return; |
| 223 | |
| 224 | BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); |
| 225 | |
| 226 | /* Kill poor orphan */ |
| 227 | bt_sock_unlink(&rfcomm_sk_list, sk); |
| 228 | sock_set_flag(sk, SOCK_DEAD); |
| 229 | sock_put(sk); |
| 230 | } |
| 231 | |
| 232 | static void __rfcomm_sock_close(struct sock *sk) |
| 233 | { |
| 234 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
| 235 | |
| 236 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); |
| 237 | |
| 238 | switch (sk->sk_state) { |
| 239 | case BT_LISTEN: |
| 240 | rfcomm_sock_cleanup_listen(sk); |
| 241 | break; |
| 242 | |
| 243 | case BT_CONNECT: |
| 244 | case BT_CONNECT2: |
| 245 | case BT_CONFIG: |
| 246 | case BT_CONNECTED: |
| 247 | rfcomm_dlc_close(d, 0); |
| 248 | |
| 249 | default: |
| 250 | sock_set_flag(sk, SOCK_ZAPPED); |
| 251 | break; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | /* Close socket. |
| 256 | * Must be called on unlocked socket. |
| 257 | */ |
| 258 | static void rfcomm_sock_close(struct sock *sk) |
| 259 | { |
| 260 | lock_sock(sk); |
| 261 | __rfcomm_sock_close(sk); |
| 262 | release_sock(sk); |
| 263 | } |
| 264 | |
| 265 | static void rfcomm_sock_init(struct sock *sk, struct sock *parent) |
| 266 | { |
| 267 | struct rfcomm_pinfo *pi = rfcomm_pi(sk); |
| 268 | |
| 269 | BT_DBG("sk %p", sk); |
| 270 | |
| 271 | if (parent) { |
| 272 | sk->sk_type = parent->sk_type; |
| 273 | pi->link_mode = rfcomm_pi(parent)->link_mode; |
| 274 | } else { |
| 275 | pi->link_mode = 0; |
| 276 | } |
| 277 | |
| 278 | pi->dlc->link_mode = pi->link_mode; |
| 279 | } |
| 280 | |
| 281 | static struct proto rfcomm_proto = { |
| 282 | .name = "RFCOMM", |
| 283 | .owner = THIS_MODULE, |
| 284 | .obj_size = sizeof(struct rfcomm_pinfo) |
| 285 | }; |
| 286 | |
Victor Fusco | 2eb25a6 | 2005-08-09 20:29:11 -0700 | [diff] [blame] | 287 | static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, unsigned int __nocast prio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | struct rfcomm_dlc *d; |
| 290 | struct sock *sk; |
| 291 | |
| 292 | sk = sk_alloc(PF_BLUETOOTH, prio, &rfcomm_proto, 1); |
| 293 | if (!sk) |
| 294 | return NULL; |
| 295 | |
| 296 | sock_init_data(sock, sk); |
| 297 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); |
| 298 | |
| 299 | d = rfcomm_dlc_alloc(prio); |
| 300 | if (!d) { |
| 301 | sk_free(sk); |
| 302 | return NULL; |
| 303 | } |
| 304 | |
| 305 | d->data_ready = rfcomm_sk_data_ready; |
| 306 | d->state_change = rfcomm_sk_state_change; |
| 307 | |
| 308 | rfcomm_pi(sk)->dlc = d; |
| 309 | d->owner = sk; |
| 310 | |
| 311 | sk->sk_destruct = rfcomm_sock_destruct; |
| 312 | sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT; |
| 313 | |
| 314 | sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; |
| 315 | sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; |
| 316 | |
| 317 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 318 | |
| 319 | sk->sk_protocol = proto; |
| 320 | sk->sk_state = BT_OPEN; |
| 321 | |
| 322 | bt_sock_link(&rfcomm_sk_list, sk); |
| 323 | |
| 324 | BT_DBG("sk %p", sk); |
| 325 | return sk; |
| 326 | } |
| 327 | |
| 328 | static int rfcomm_sock_create(struct socket *sock, int protocol) |
| 329 | { |
| 330 | struct sock *sk; |
| 331 | |
| 332 | BT_DBG("sock %p", sock); |
| 333 | |
| 334 | sock->state = SS_UNCONNECTED; |
| 335 | |
| 336 | if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW) |
| 337 | return -ESOCKTNOSUPPORT; |
| 338 | |
| 339 | sock->ops = &rfcomm_sock_ops; |
| 340 | |
| 341 | if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL))) |
| 342 | return -ENOMEM; |
| 343 | |
| 344 | rfcomm_sock_init(sk, NULL); |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
| 349 | { |
| 350 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; |
| 351 | struct sock *sk = sock->sk; |
| 352 | int err = 0; |
| 353 | |
| 354 | BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr)); |
| 355 | |
| 356 | if (!addr || addr->sa_family != AF_BLUETOOTH) |
| 357 | return -EINVAL; |
| 358 | |
| 359 | lock_sock(sk); |
| 360 | |
| 361 | if (sk->sk_state != BT_OPEN) { |
| 362 | err = -EBADFD; |
| 363 | goto done; |
| 364 | } |
| 365 | |
Marcel Holtmann | 354d28d | 2005-09-13 01:32:31 +0200 | [diff] [blame^] | 366 | if (sk->sk_type != SOCK_STREAM) { |
| 367 | err = -EINVAL; |
| 368 | goto done; |
| 369 | } |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | write_lock_bh(&rfcomm_sk_list.lock); |
| 372 | |
| 373 | if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) { |
| 374 | err = -EADDRINUSE; |
| 375 | } else { |
| 376 | /* Save source address */ |
| 377 | bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr); |
| 378 | rfcomm_pi(sk)->channel = sa->rc_channel; |
| 379 | sk->sk_state = BT_BOUND; |
| 380 | } |
| 381 | |
| 382 | write_unlock_bh(&rfcomm_sk_list.lock); |
| 383 | |
| 384 | done: |
| 385 | release_sock(sk); |
| 386 | return err; |
| 387 | } |
| 388 | |
| 389 | static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) |
| 390 | { |
| 391 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; |
| 392 | struct sock *sk = sock->sk; |
| 393 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
| 394 | int err = 0; |
| 395 | |
| 396 | BT_DBG("sk %p", sk); |
| 397 | |
| 398 | if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc)) |
| 399 | return -EINVAL; |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | lock_sock(sk); |
| 402 | |
Marcel Holtmann | 354d28d | 2005-09-13 01:32:31 +0200 | [diff] [blame^] | 403 | if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { |
| 404 | err = -EBADFD; |
| 405 | goto done; |
| 406 | } |
| 407 | |
| 408 | if (sk->sk_type != SOCK_STREAM) { |
| 409 | err = -EINVAL; |
| 410 | goto done; |
| 411 | } |
| 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | sk->sk_state = BT_CONNECT; |
| 414 | bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr); |
| 415 | rfcomm_pi(sk)->channel = sa->rc_channel; |
| 416 | |
| 417 | err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel); |
| 418 | if (!err) |
| 419 | err = bt_sock_wait_state(sk, BT_CONNECTED, |
| 420 | sock_sndtimeo(sk, flags & O_NONBLOCK)); |
| 421 | |
Marcel Holtmann | 354d28d | 2005-09-13 01:32:31 +0200 | [diff] [blame^] | 422 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | release_sock(sk); |
| 424 | return err; |
| 425 | } |
| 426 | |
| 427 | static int rfcomm_sock_listen(struct socket *sock, int backlog) |
| 428 | { |
| 429 | struct sock *sk = sock->sk; |
| 430 | int err = 0; |
| 431 | |
| 432 | BT_DBG("sk %p backlog %d", sk, backlog); |
| 433 | |
| 434 | lock_sock(sk); |
| 435 | |
| 436 | if (sk->sk_state != BT_BOUND) { |
| 437 | err = -EBADFD; |
| 438 | goto done; |
| 439 | } |
| 440 | |
Marcel Holtmann | 354d28d | 2005-09-13 01:32:31 +0200 | [diff] [blame^] | 441 | if (sk->sk_type != SOCK_STREAM) { |
| 442 | err = -EINVAL; |
| 443 | goto done; |
| 444 | } |
| 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | if (!rfcomm_pi(sk)->channel) { |
| 447 | bdaddr_t *src = &bt_sk(sk)->src; |
| 448 | u8 channel; |
| 449 | |
| 450 | err = -EINVAL; |
| 451 | |
| 452 | write_lock_bh(&rfcomm_sk_list.lock); |
| 453 | |
| 454 | for (channel = 1; channel < 31; channel++) |
| 455 | if (!__rfcomm_get_sock_by_addr(channel, src)) { |
| 456 | rfcomm_pi(sk)->channel = channel; |
| 457 | err = 0; |
| 458 | break; |
| 459 | } |
| 460 | |
| 461 | write_unlock_bh(&rfcomm_sk_list.lock); |
| 462 | |
| 463 | if (err < 0) |
| 464 | goto done; |
| 465 | } |
| 466 | |
| 467 | sk->sk_max_ack_backlog = backlog; |
| 468 | sk->sk_ack_backlog = 0; |
| 469 | sk->sk_state = BT_LISTEN; |
| 470 | |
| 471 | done: |
| 472 | release_sock(sk); |
| 473 | return err; |
| 474 | } |
| 475 | |
| 476 | static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) |
| 477 | { |
| 478 | DECLARE_WAITQUEUE(wait, current); |
| 479 | struct sock *sk = sock->sk, *nsk; |
| 480 | long timeo; |
| 481 | int err = 0; |
| 482 | |
| 483 | lock_sock(sk); |
| 484 | |
| 485 | if (sk->sk_state != BT_LISTEN) { |
| 486 | err = -EBADFD; |
| 487 | goto done; |
| 488 | } |
| 489 | |
Marcel Holtmann | 354d28d | 2005-09-13 01:32:31 +0200 | [diff] [blame^] | 490 | if (sk->sk_type != SOCK_STREAM) { |
| 491 | err = -EINVAL; |
| 492 | goto done; |
| 493 | } |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
| 496 | |
| 497 | BT_DBG("sk %p timeo %ld", sk, timeo); |
| 498 | |
| 499 | /* Wait for an incoming connection. (wake-one). */ |
| 500 | add_wait_queue_exclusive(sk->sk_sleep, &wait); |
| 501 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
| 502 | set_current_state(TASK_INTERRUPTIBLE); |
| 503 | if (!timeo) { |
| 504 | err = -EAGAIN; |
| 505 | break; |
| 506 | } |
| 507 | |
| 508 | release_sock(sk); |
| 509 | timeo = schedule_timeout(timeo); |
| 510 | lock_sock(sk); |
| 511 | |
| 512 | if (sk->sk_state != BT_LISTEN) { |
| 513 | err = -EBADFD; |
| 514 | break; |
| 515 | } |
| 516 | |
| 517 | if (signal_pending(current)) { |
| 518 | err = sock_intr_errno(timeo); |
| 519 | break; |
| 520 | } |
| 521 | } |
| 522 | set_current_state(TASK_RUNNING); |
| 523 | remove_wait_queue(sk->sk_sleep, &wait); |
| 524 | |
| 525 | if (err) |
| 526 | goto done; |
| 527 | |
| 528 | newsock->state = SS_CONNECTED; |
| 529 | |
| 530 | BT_DBG("new socket %p", nsk); |
| 531 | |
| 532 | done: |
| 533 | release_sock(sk); |
| 534 | return err; |
| 535 | } |
| 536 | |
| 537 | static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) |
| 538 | { |
| 539 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; |
| 540 | struct sock *sk = sock->sk; |
| 541 | |
| 542 | BT_DBG("sock %p, sk %p", sock, sk); |
| 543 | |
| 544 | sa->rc_family = AF_BLUETOOTH; |
| 545 | sa->rc_channel = rfcomm_pi(sk)->channel; |
| 546 | if (peer) |
| 547 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst); |
| 548 | else |
| 549 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src); |
| 550 | |
| 551 | *len = sizeof(struct sockaddr_rc); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 556 | struct msghdr *msg, size_t len) |
| 557 | { |
| 558 | struct sock *sk = sock->sk; |
| 559 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; |
| 560 | struct sk_buff *skb; |
| 561 | int err; |
| 562 | int sent = 0; |
| 563 | |
| 564 | if (msg->msg_flags & MSG_OOB) |
| 565 | return -EOPNOTSUPP; |
| 566 | |
| 567 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 568 | return -EPIPE; |
| 569 | |
| 570 | BT_DBG("sock %p, sk %p", sock, sk); |
| 571 | |
| 572 | lock_sock(sk); |
| 573 | |
| 574 | while (len) { |
| 575 | size_t size = min_t(size_t, len, d->mtu); |
| 576 | |
| 577 | skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, |
| 578 | msg->msg_flags & MSG_DONTWAIT, &err); |
| 579 | if (!skb) |
| 580 | break; |
| 581 | skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); |
| 582 | |
| 583 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
| 584 | if (err) { |
| 585 | kfree_skb(skb); |
| 586 | sent = err; |
| 587 | break; |
| 588 | } |
| 589 | |
| 590 | err = rfcomm_dlc_send(d, skb); |
| 591 | if (err < 0) { |
| 592 | kfree_skb(skb); |
| 593 | break; |
| 594 | } |
| 595 | |
| 596 | sent += size; |
| 597 | len -= size; |
| 598 | } |
| 599 | |
| 600 | release_sock(sk); |
| 601 | |
| 602 | return sent ? sent : err; |
| 603 | } |
| 604 | |
| 605 | static long rfcomm_sock_data_wait(struct sock *sk, long timeo) |
| 606 | { |
| 607 | DECLARE_WAITQUEUE(wait, current); |
| 608 | |
| 609 | add_wait_queue(sk->sk_sleep, &wait); |
| 610 | for (;;) { |
| 611 | set_current_state(TASK_INTERRUPTIBLE); |
| 612 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 613 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
| 614 | sk->sk_err || |
| 615 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 616 | signal_pending(current) || |
| 617 | !timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | break; |
| 619 | |
| 620 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 621 | release_sock(sk); |
| 622 | timeo = schedule_timeout(timeo); |
| 623 | lock_sock(sk); |
| 624 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 625 | } |
| 626 | |
| 627 | __set_current_state(TASK_RUNNING); |
| 628 | remove_wait_queue(sk->sk_sleep, &wait); |
| 629 | return timeo; |
| 630 | } |
| 631 | |
| 632 | static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 633 | struct msghdr *msg, size_t size, int flags) |
| 634 | { |
| 635 | struct sock *sk = sock->sk; |
| 636 | int err = 0; |
| 637 | size_t target, copied = 0; |
| 638 | long timeo; |
| 639 | |
| 640 | if (flags & MSG_OOB) |
| 641 | return -EOPNOTSUPP; |
| 642 | |
| 643 | msg->msg_namelen = 0; |
| 644 | |
| 645 | BT_DBG("sk %p size %d", sk, size); |
| 646 | |
| 647 | lock_sock(sk); |
| 648 | |
| 649 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, size); |
| 650 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
| 651 | |
| 652 | do { |
| 653 | struct sk_buff *skb; |
| 654 | int chunk; |
| 655 | |
| 656 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 657 | if (!skb) { |
| 658 | if (copied >= target) |
| 659 | break; |
| 660 | |
| 661 | if ((err = sock_error(sk)) != 0) |
| 662 | break; |
| 663 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 664 | break; |
| 665 | |
| 666 | err = -EAGAIN; |
| 667 | if (!timeo) |
| 668 | break; |
| 669 | |
| 670 | timeo = rfcomm_sock_data_wait(sk, timeo); |
| 671 | |
| 672 | if (signal_pending(current)) { |
| 673 | err = sock_intr_errno(timeo); |
| 674 | goto out; |
| 675 | } |
| 676 | continue; |
| 677 | } |
| 678 | |
| 679 | chunk = min_t(unsigned int, skb->len, size); |
| 680 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { |
| 681 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 682 | if (!copied) |
| 683 | copied = -EFAULT; |
| 684 | break; |
| 685 | } |
| 686 | copied += chunk; |
| 687 | size -= chunk; |
| 688 | |
| 689 | if (!(flags & MSG_PEEK)) { |
| 690 | atomic_sub(chunk, &sk->sk_rmem_alloc); |
| 691 | |
| 692 | skb_pull(skb, chunk); |
| 693 | if (skb->len) { |
| 694 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 695 | break; |
| 696 | } |
| 697 | kfree_skb(skb); |
| 698 | |
| 699 | } else { |
| 700 | /* put message back and return */ |
| 701 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 702 | break; |
| 703 | } |
| 704 | } while (size); |
| 705 | |
| 706 | out: |
| 707 | if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2)) |
| 708 | rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc); |
| 709 | |
| 710 | release_sock(sk); |
| 711 | return copied ? : err; |
| 712 | } |
| 713 | |
| 714 | static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) |
| 715 | { |
| 716 | struct sock *sk = sock->sk; |
| 717 | int err = 0; |
| 718 | u32 opt; |
| 719 | |
| 720 | BT_DBG("sk %p", sk); |
| 721 | |
| 722 | lock_sock(sk); |
| 723 | |
| 724 | switch (optname) { |
| 725 | case RFCOMM_LM: |
| 726 | if (get_user(opt, (u32 __user *) optval)) { |
| 727 | err = -EFAULT; |
| 728 | break; |
| 729 | } |
| 730 | |
| 731 | rfcomm_pi(sk)->link_mode = opt; |
| 732 | break; |
| 733 | |
| 734 | default: |
| 735 | err = -ENOPROTOOPT; |
| 736 | break; |
| 737 | } |
| 738 | |
| 739 | release_sock(sk); |
| 740 | return err; |
| 741 | } |
| 742 | |
| 743 | static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
| 744 | { |
| 745 | struct sock *sk = sock->sk; |
| 746 | struct sock *l2cap_sk; |
| 747 | struct rfcomm_conninfo cinfo; |
| 748 | int len, err = 0; |
| 749 | |
| 750 | BT_DBG("sk %p", sk); |
| 751 | |
| 752 | if (get_user(len, optlen)) |
| 753 | return -EFAULT; |
| 754 | |
| 755 | lock_sock(sk); |
| 756 | |
| 757 | switch (optname) { |
| 758 | case RFCOMM_LM: |
| 759 | if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval)) |
| 760 | err = -EFAULT; |
| 761 | break; |
| 762 | |
| 763 | case RFCOMM_CONNINFO: |
| 764 | if (sk->sk_state != BT_CONNECTED) { |
| 765 | err = -ENOTCONN; |
| 766 | break; |
| 767 | } |
| 768 | |
| 769 | l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk; |
| 770 | |
| 771 | cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle; |
| 772 | memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3); |
| 773 | |
| 774 | len = min_t(unsigned int, len, sizeof(cinfo)); |
| 775 | if (copy_to_user(optval, (char *) &cinfo, len)) |
| 776 | err = -EFAULT; |
| 777 | |
| 778 | break; |
| 779 | |
| 780 | default: |
| 781 | err = -ENOPROTOOPT; |
| 782 | break; |
| 783 | } |
| 784 | |
| 785 | release_sock(sk); |
| 786 | return err; |
| 787 | } |
| 788 | |
| 789 | static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 790 | { |
| 791 | struct sock *sk = sock->sk; |
| 792 | int err; |
| 793 | |
| 794 | lock_sock(sk); |
| 795 | |
| 796 | #ifdef CONFIG_BT_RFCOMM_TTY |
| 797 | err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg); |
| 798 | #else |
| 799 | err = -EOPNOTSUPP; |
| 800 | #endif |
| 801 | |
| 802 | release_sock(sk); |
| 803 | return err; |
| 804 | } |
| 805 | |
| 806 | static int rfcomm_sock_shutdown(struct socket *sock, int how) |
| 807 | { |
| 808 | struct sock *sk = sock->sk; |
| 809 | int err = 0; |
| 810 | |
| 811 | BT_DBG("sock %p, sk %p", sock, sk); |
| 812 | |
| 813 | if (!sk) return 0; |
| 814 | |
| 815 | lock_sock(sk); |
| 816 | if (!sk->sk_shutdown) { |
| 817 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 818 | __rfcomm_sock_close(sk); |
| 819 | |
| 820 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
| 821 | err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); |
| 822 | } |
| 823 | release_sock(sk); |
| 824 | return err; |
| 825 | } |
| 826 | |
| 827 | static int rfcomm_sock_release(struct socket *sock) |
| 828 | { |
| 829 | struct sock *sk = sock->sk; |
| 830 | int err; |
| 831 | |
| 832 | BT_DBG("sock %p, sk %p", sock, sk); |
| 833 | |
| 834 | if (!sk) |
| 835 | return 0; |
| 836 | |
| 837 | err = rfcomm_sock_shutdown(sock, 2); |
| 838 | |
| 839 | sock_orphan(sk); |
| 840 | rfcomm_sock_kill(sk); |
| 841 | return err; |
| 842 | } |
| 843 | |
| 844 | /* ---- RFCOMM core layer callbacks ---- |
| 845 | * |
| 846 | * called under rfcomm_lock() |
| 847 | */ |
| 848 | int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) |
| 849 | { |
| 850 | struct sock *sk, *parent; |
| 851 | bdaddr_t src, dst; |
| 852 | int result = 0; |
| 853 | |
| 854 | BT_DBG("session %p channel %d", s, channel); |
| 855 | |
| 856 | rfcomm_session_getaddr(s, &src, &dst); |
| 857 | |
| 858 | /* Check if we have socket listening on channel */ |
| 859 | parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); |
| 860 | if (!parent) |
| 861 | return 0; |
| 862 | |
| 863 | /* Check for backlog size */ |
| 864 | if (sk_acceptq_is_full(parent)) { |
| 865 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
| 866 | goto done; |
| 867 | } |
| 868 | |
| 869 | sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC); |
| 870 | if (!sk) |
| 871 | goto done; |
| 872 | |
| 873 | rfcomm_sock_init(sk, parent); |
| 874 | bacpy(&bt_sk(sk)->src, &src); |
| 875 | bacpy(&bt_sk(sk)->dst, &dst); |
| 876 | rfcomm_pi(sk)->channel = channel; |
| 877 | |
| 878 | sk->sk_state = BT_CONFIG; |
| 879 | bt_accept_enqueue(parent, sk); |
| 880 | |
| 881 | /* Accept connection and return socket DLC */ |
| 882 | *d = rfcomm_pi(sk)->dlc; |
| 883 | result = 1; |
| 884 | |
| 885 | done: |
| 886 | bh_unlock_sock(parent); |
| 887 | return result; |
| 888 | } |
| 889 | |
| 890 | /* ---- Proc fs support ---- */ |
| 891 | #ifdef CONFIG_PROC_FS |
| 892 | static void *rfcomm_seq_start(struct seq_file *seq, loff_t *pos) |
| 893 | { |
| 894 | struct sock *sk; |
| 895 | struct hlist_node *node; |
| 896 | loff_t l = *pos; |
| 897 | |
| 898 | read_lock_bh(&rfcomm_sk_list.lock); |
| 899 | |
| 900 | sk_for_each(sk, node, &rfcomm_sk_list.head) |
| 901 | if (!l--) |
| 902 | return sk; |
| 903 | return NULL; |
| 904 | } |
| 905 | |
| 906 | static void *rfcomm_seq_next(struct seq_file *seq, void *e, loff_t *pos) |
| 907 | { |
| 908 | struct sock *sk = e; |
| 909 | (*pos)++; |
| 910 | return sk_next(sk); |
| 911 | } |
| 912 | |
| 913 | static void rfcomm_seq_stop(struct seq_file *seq, void *e) |
| 914 | { |
| 915 | read_unlock_bh(&rfcomm_sk_list.lock); |
| 916 | } |
| 917 | |
| 918 | static int rfcomm_seq_show(struct seq_file *seq, void *e) |
| 919 | { |
| 920 | struct sock *sk = e; |
| 921 | seq_printf(seq, "%s %s %d %d\n", |
| 922 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), |
| 923 | sk->sk_state, rfcomm_pi(sk)->channel); |
| 924 | return 0; |
| 925 | } |
| 926 | |
| 927 | static struct seq_operations rfcomm_seq_ops = { |
| 928 | .start = rfcomm_seq_start, |
| 929 | .next = rfcomm_seq_next, |
| 930 | .stop = rfcomm_seq_stop, |
| 931 | .show = rfcomm_seq_show |
| 932 | }; |
| 933 | |
| 934 | static int rfcomm_seq_open(struct inode *inode, struct file *file) |
| 935 | { |
| 936 | return seq_open(file, &rfcomm_seq_ops); |
| 937 | } |
| 938 | |
| 939 | static struct file_operations rfcomm_seq_fops = { |
| 940 | .owner = THIS_MODULE, |
| 941 | .open = rfcomm_seq_open, |
| 942 | .read = seq_read, |
| 943 | .llseek = seq_lseek, |
| 944 | .release = seq_release, |
| 945 | }; |
| 946 | |
| 947 | static int __init rfcomm_sock_proc_init(void) |
| 948 | { |
| 949 | struct proc_dir_entry *p = create_proc_entry("sock", S_IRUGO, proc_bt_rfcomm); |
| 950 | if (!p) |
| 951 | return -ENOMEM; |
| 952 | p->proc_fops = &rfcomm_seq_fops; |
| 953 | return 0; |
| 954 | } |
| 955 | |
| 956 | static void __exit rfcomm_sock_proc_cleanup(void) |
| 957 | { |
| 958 | remove_proc_entry("sock", proc_bt_rfcomm); |
| 959 | } |
| 960 | |
| 961 | #else /* CONFIG_PROC_FS */ |
| 962 | |
| 963 | static int __init rfcomm_sock_proc_init(void) |
| 964 | { |
| 965 | return 0; |
| 966 | } |
| 967 | |
| 968 | static void __exit rfcomm_sock_proc_cleanup(void) |
| 969 | { |
| 970 | return; |
| 971 | } |
| 972 | #endif /* CONFIG_PROC_FS */ |
| 973 | |
| 974 | static struct proto_ops rfcomm_sock_ops = { |
| 975 | .family = PF_BLUETOOTH, |
| 976 | .owner = THIS_MODULE, |
| 977 | .release = rfcomm_sock_release, |
| 978 | .bind = rfcomm_sock_bind, |
| 979 | .connect = rfcomm_sock_connect, |
| 980 | .listen = rfcomm_sock_listen, |
| 981 | .accept = rfcomm_sock_accept, |
| 982 | .getname = rfcomm_sock_getname, |
| 983 | .sendmsg = rfcomm_sock_sendmsg, |
| 984 | .recvmsg = rfcomm_sock_recvmsg, |
| 985 | .shutdown = rfcomm_sock_shutdown, |
| 986 | .setsockopt = rfcomm_sock_setsockopt, |
| 987 | .getsockopt = rfcomm_sock_getsockopt, |
| 988 | .ioctl = rfcomm_sock_ioctl, |
| 989 | .poll = bt_sock_poll, |
| 990 | .socketpair = sock_no_socketpair, |
| 991 | .mmap = sock_no_mmap |
| 992 | }; |
| 993 | |
| 994 | static struct net_proto_family rfcomm_sock_family_ops = { |
| 995 | .family = PF_BLUETOOTH, |
| 996 | .owner = THIS_MODULE, |
| 997 | .create = rfcomm_sock_create |
| 998 | }; |
| 999 | |
| 1000 | int __init rfcomm_init_sockets(void) |
| 1001 | { |
| 1002 | int err; |
| 1003 | |
| 1004 | err = proto_register(&rfcomm_proto, 0); |
| 1005 | if (err < 0) |
| 1006 | return err; |
| 1007 | |
| 1008 | err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); |
| 1009 | if (err < 0) |
| 1010 | goto error; |
| 1011 | |
| 1012 | rfcomm_sock_proc_init(); |
| 1013 | |
| 1014 | BT_INFO("RFCOMM socket layer initialized"); |
| 1015 | |
| 1016 | return 0; |
| 1017 | |
| 1018 | error: |
| 1019 | BT_ERR("RFCOMM socket layer registration failed"); |
| 1020 | proto_unregister(&rfcomm_proto); |
| 1021 | return err; |
| 1022 | } |
| 1023 | |
| 1024 | void __exit rfcomm_cleanup_sockets(void) |
| 1025 | { |
| 1026 | rfcomm_sock_proc_cleanup(); |
| 1027 | |
| 1028 | if (bt_sock_unregister(BTPROTO_RFCOMM) < 0) |
| 1029 | BT_ERR("RFCOMM socket layer unregistration failed"); |
| 1030 | |
| 1031 | proto_unregister(&rfcomm_proto); |
| 1032 | } |