net/bluetooth/l2cap_core.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4    Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
   5    Copyright (C) 2010 Google Inc.
   6    Copyright (C) 2011 ProFUSION Embedded Systems
   7
   8    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License version 2 as
  12    published by the Free Software Foundation;
  13
  14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  17    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  18    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  19    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  20    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  21    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22
  23    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  24    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  25    SOFTWARE IS DISCLAIMED.
  26 */
  27
  28 /* Bluetooth L2CAP core. */
  29
  30 #include <linux/module.h>
  31
  32 #include <linux/types.h>
  33 #include <linux/capability.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  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/device.h>
  46 #include <linux/debugfs.h>
  47 #include <linux/seq_file.h>
  48 #include <linux/uaccess.h>
  49 #include <linux/crc16.h>
  50 #include <net/sock.h>
  51
  52 #include <asm/system.h>
  53 #include <asm/unaligned.h>
  54
  55 #include <net/bluetooth/bluetooth.h>
  56 #include <net/bluetooth/hci_core.h>
  57 #include <net/bluetooth/l2cap.h>
  58 #include <net/bluetooth/smp.h>
  59
  60 bool disable_ertm;
  61
  62 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
  63 static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
  64
  65 static LIST_HEAD(chan_list);
  66 static DEFINE_RWLOCK(chan_list_lock);
  67
  68 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
  69                                 u8 code, u8 ident, u16 dlen, void *data);
  70 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
  71                                                                 void *data);
  72 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
  73 static void l2cap_send_disconn_req(struct l2cap_conn *conn,
  74                                 struct l2cap_chan *chan, int err);
  75
  76 /* ---- L2CAP channels ---- */
  77
  78 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
  79 {
  80         struct l2cap_chan *c, *r = NULL;
  81
  82         rcu_read_lock();
  83
  84         list_for_each_entry_rcu(c, &conn->chan_l, list) {
  85                 if (c->dcid == cid) {
  86                         r = c;
  87                         break;
  88                 }
  89         }
  90
  91         rcu_read_unlock();
  92         return r;
  93 }
  94
  95 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
  96 {
  97         struct l2cap_chan *c, *r = NULL;
  98
  99         rcu_read_lock();
 100
 101         list_for_each_entry_rcu(c, &conn->chan_l, list) {
 102                 if (c->scid == cid) {
 103                         r = c;
 104                         break;
 105                 }
 106         }
 107
 108         rcu_read_unlock();
 109         return r;
 110 }
 111
 112 /* Find channel with given SCID.
 113  * Returns locked socket */
 114 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
 115 {
 116         struct l2cap_chan *c;
 117
 118         c = __l2cap_get_chan_by_scid(conn, cid);
 119         if (c)
 120                 lock_sock(c->sk);
 121         return c;
 122 }
 123
 124 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
 125 {
 126         struct l2cap_chan *c, *r = NULL;
 127
 128         rcu_read_lock();
 129
 130         list_for_each_entry_rcu(c, &conn->chan_l, list) {
 131                 if (c->ident == ident) {
 132                         r = c;
 133                         break;
 134                 }
 135         }
 136
 137         rcu_read_unlock();
 138         return r;
 139 }
 140
 141 static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
 142 {
 143         struct l2cap_chan *c;
 144
 145         c = __l2cap_get_chan_by_ident(conn, ident);
 146         if (c)
 147                 lock_sock(c->sk);
 148         return c;
 149 }
 150
 151 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
 152 {
 153         struct l2cap_chan *c;
 154
 155         list_for_each_entry(c, &chan_list, global_l) {
 156                 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
 157                         return c;
 158         }
 159         return NULL;
 160 }
 161
 162 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
 163 {
 164         int err;
 165
 166         write_lock(&chan_list_lock);
 167
 168         if (psm && __l2cap_global_chan_by_addr(psm, src)) {
 169                 err = -EADDRINUSE;
 170                 goto done;
 171         }
 172
 173         if (psm) {
 174                 chan->psm = psm;
 175                 chan->sport = psm;
 176                 err = 0;
 177         } else {
 178                 u16 p;
 179
 180                 err = -EINVAL;
 181                 for (p = 0x1001; p < 0x1100; p += 2)
 182                         if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
 183                                 chan->psm   = cpu_to_le16(p);
 184                                 chan->sport = cpu_to_le16(p);
 185                                 err = 0;
 186                                 break;
 187                         }
 188         }
 189
 190 done:
 191         write_unlock(&chan_list_lock);
 192         return err;
 193 }
 194
 195 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid)
 196 {
 197         write_lock(&chan_list_lock);
 198
 199         chan->scid = scid;
 200
 201         write_unlock(&chan_list_lock);
 202
 203         return 0;
 204 }
 205
 206 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
 207 {
 208         u16 cid = L2CAP_CID_DYN_START;
 209
 210         for (; cid < L2CAP_CID_DYN_END; cid++) {
 211                 if (!__l2cap_get_chan_by_scid(conn, cid))
 212                         return cid;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static char *state_to_string(int state)
 219 {
 220         switch(state) {
 221         case BT_CONNECTED:
 222                 return "BT_CONNECTED";
 223         case BT_OPEN:
 224                 return "BT_OPEN";
 225         case BT_BOUND:
 226                 return "BT_BOUND";
 227         case BT_LISTEN:
 228                 return "BT_LISTEN";
 229         case BT_CONNECT:
 230                 return "BT_CONNECT";
 231         case BT_CONNECT2:
 232                 return "BT_CONNECT2";
 233         case BT_CONFIG:
 234                 return "BT_CONFIG";
 235         case BT_DISCONN:
 236                 return "BT_DISCONN";
 237         case BT_CLOSED:
 238                 return "BT_CLOSED";
 239         }
 240
 241         return "invalid state";
 242 }
 243
 244 static void l2cap_state_change(struct l2cap_chan *chan, int state)
 245 {
 246         BT_DBG("%p %s -> %s", chan, state_to_string(chan->state),
 247                                                 state_to_string(state));
 248
 249         chan->state = state;
 250         chan->ops->state_change(chan->data, state);
 251 }
 252
 253 static void l2cap_chan_timeout(struct work_struct *work)
 254 {
 255         struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
 256                                                         chan_timer.work);
 257         struct sock *sk = chan->sk;
 258         int reason;
 259
 260         BT_DBG("chan %p state %d", chan, chan->state);
 261
 262         lock_sock(sk);
 263
 264         if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
 265                 reason = ECONNREFUSED;
 266         else if (chan->state == BT_CONNECT &&
 267                                         chan->sec_level != BT_SECURITY_SDP)
 268                 reason = ECONNREFUSED;
 269         else
 270                 reason = ETIMEDOUT;
 271
 272         l2cap_chan_close(chan, reason);
 273
 274         release_sock(sk);
 275
 276         chan->ops->close(chan->data);
 277         l2cap_chan_put(chan);
 278 }
 279
 280 struct l2cap_chan *l2cap_chan_create(struct sock *sk)
 281 {
 282         struct l2cap_chan *chan;
 283
 284         chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
 285         if (!chan)
 286                 return NULL;
 287
 288         chan->sk = sk;
 289
 290         write_lock(&chan_list_lock);
 291         list_add(&chan->global_l, &chan_list);
 292         write_unlock(&chan_list_lock);
 293
 294         INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
 295
 296         chan->state = BT_OPEN;
 297
 298         atomic_set(&chan->refcnt, 1);
 299
 300         BT_DBG("sk %p chan %p", sk, chan);
 301
 302         return chan;
 303 }
 304
 305 void l2cap_chan_destroy(struct l2cap_chan *chan)
 306 {
 307         write_lock(&chan_list_lock);
 308         list_del(&chan->global_l);
 309         write_unlock(&chan_list_lock);
 310
 311         l2cap_chan_put(chan);
 312 }
 313
 314 static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
 315 {
 316         BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
 317                         chan->psm, chan->dcid);
 318
 319         conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
 320
 321         chan->conn = conn;
 322
 323         switch (chan->chan_type) {
 324         case L2CAP_CHAN_CONN_ORIENTED:
 325                 if (conn->hcon->type == LE_LINK) {
 326                         /* LE connection */
 327                         chan->omtu = L2CAP_LE_DEFAULT_MTU;
 328                         chan->scid = L2CAP_CID_LE_DATA;
 329                         chan->dcid = L2CAP_CID_LE_DATA;
 330                 } else {
 331                         /* Alloc CID for connection-oriented socket */
 332                         chan->scid = l2cap_alloc_cid(conn);
 333                         chan->omtu = L2CAP_DEFAULT_MTU;
 334                 }
 335                 break;
 336
 337         case L2CAP_CHAN_CONN_LESS:
 338                 /* Connectionless socket */
 339                 chan->scid = L2CAP_CID_CONN_LESS;
 340                 chan->dcid = L2CAP_CID_CONN_LESS;
 341                 chan->omtu = L2CAP_DEFAULT_MTU;
 342                 break;
 343
 344         default:
 345                 /* Raw socket can send/recv signalling messages only */
 346                 chan->scid = L2CAP_CID_SIGNALING;
 347                 chan->dcid = L2CAP_CID_SIGNALING;
 348                 chan->omtu = L2CAP_DEFAULT_MTU;
 349         }
 350
 351         chan->local_id          = L2CAP_BESTEFFORT_ID;
 352         chan->local_stype       = L2CAP_SERV_BESTEFFORT;
 353         chan->local_msdu        = L2CAP_DEFAULT_MAX_SDU_SIZE;
 354         chan->local_sdu_itime   = L2CAP_DEFAULT_SDU_ITIME;
 355         chan->local_acc_lat     = L2CAP_DEFAULT_ACC_LAT;
 356         chan->local_flush_to    = L2CAP_DEFAULT_FLUSH_TO;
 357
 358         l2cap_chan_hold(chan);
 359
 360         list_add_rcu(&chan->list, &conn->chan_l);
 361 }
 362
 363 /* Delete channel.
 364  * Must be called on the locked socket. */
 365 static void l2cap_chan_del(struct l2cap_chan *chan, int err)
 366 {
 367         struct sock *sk = chan->sk;
 368         struct l2cap_conn *conn = chan->conn;
 369         struct sock *parent = bt_sk(sk)->parent;
 370
 371         __clear_chan_timer(chan);
 372
 373         BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
 374
 375         if (conn) {
 376                 /* Delete from channel list */
 377                 list_del_rcu(&chan->list);
 378                 synchronize_rcu();
 379
 380                 l2cap_chan_put(chan);
 381
 382                 chan->conn = NULL;
 383                 hci_conn_put(conn->hcon);
 384         }
 385
 386         l2cap_state_change(chan, BT_CLOSED);
 387         sock_set_flag(sk, SOCK_ZAPPED);
 388
 389         if (err)
 390                 sk->sk_err = err;
 391
 392         if (parent) {
 393                 bt_accept_unlink(sk);
 394                 parent->sk_data_ready(parent, 0);
 395         } else
 396                 sk->sk_state_change(sk);
 397
 398         if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
 399                         test_bit(CONF_INPUT_DONE, &chan->conf_state)))
 400                 return;
 401
 402         skb_queue_purge(&chan->tx_q);
 403
 404         if (chan->mode == L2CAP_MODE_ERTM) {
 405                 struct srej_list *l, *tmp;
 406
 407                 __clear_retrans_timer(chan);
 408                 __clear_monitor_timer(chan);
 409                 __clear_ack_timer(chan);
 410
 411                 skb_queue_purge(&chan->srej_q);
 412
 413                 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
 414                         list_del(&l->list);
 415                         kfree(l);
 416                 }
 417         }
 418 }
 419
 420 static void l2cap_chan_cleanup_listen(struct sock *parent)
 421 {
 422         struct sock *sk;
 423
 424         BT_DBG("parent %p", parent);
 425
 426         /* Close not yet accepted channels */
 427         while ((sk = bt_accept_dequeue(parent, NULL))) {
 428                 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
 429                 __clear_chan_timer(chan);
 430                 lock_sock(sk);
 431                 l2cap_chan_close(chan, ECONNRESET);
 432                 release_sock(sk);
 433                 chan->ops->close(chan->data);
 434         }
 435 }
 436
 437 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
 438 {
 439         struct l2cap_conn *conn = chan->conn;
 440         struct sock *sk = chan->sk;
 441
 442         BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket);
 443
 444         switch (chan->state) {
 445         case BT_LISTEN:
 446                 l2cap_chan_cleanup_listen(sk);
 447
 448                 l2cap_state_change(chan, BT_CLOSED);
 449                 sock_set_flag(sk, SOCK_ZAPPED);
 450                 break;
 451
 452         case BT_CONNECTED:
 453         case BT_CONFIG:
 454                 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
 455                                         conn->hcon->type == ACL_LINK) {
 456                         __clear_chan_timer(chan);
 457                         __set_chan_timer(chan, sk->sk_sndtimeo);
 458                         l2cap_send_disconn_req(conn, chan, reason);
 459                 } else
 460                         l2cap_chan_del(chan, reason);
 461                 break;
 462
 463         case BT_CONNECT2:
 464                 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
 465                                         conn->hcon->type == ACL_LINK) {
 466                         struct l2cap_conn_rsp rsp;
 467                         __u16 result;
 468
 469                         if (bt_sk(sk)->defer_setup)
 470                                 result = L2CAP_CR_SEC_BLOCK;
 471                         else
 472                                 result = L2CAP_CR_BAD_PSM;
 473                         l2cap_state_change(chan, BT_DISCONN);
 474
 475                         rsp.scid   = cpu_to_le16(chan->dcid);
 476                         rsp.dcid   = cpu_to_le16(chan->scid);
 477                         rsp.result = cpu_to_le16(result);
 478                         rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
 479                         l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
 480                                                         sizeof(rsp), &rsp);
 481                 }
 482
 483                 l2cap_chan_del(chan, reason);
 484                 break;
 485
 486         case BT_CONNECT:
 487         case BT_DISCONN:
 488                 l2cap_chan_del(chan, reason);
 489                 break;
 490
 491         default:
 492                 sock_set_flag(sk, SOCK_ZAPPED);
 493                 break;
 494         }
 495 }
 496
 497 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
 498 {
 499         if (chan->chan_type == L2CAP_CHAN_RAW) {
 500                 switch (chan->sec_level) {
 501                 case BT_SECURITY_HIGH:
 502                         return HCI_AT_DEDICATED_BONDING_MITM;
 503                 case BT_SECURITY_MEDIUM:
 504                         return HCI_AT_DEDICATED_BONDING;
 505                 default:
 506                         return HCI_AT_NO_BONDING;
 507                 }
 508         } else if (chan->psm == cpu_to_le16(0x0001)) {
 509                 if (chan->sec_level == BT_SECURITY_LOW)
 510                         chan->sec_level = BT_SECURITY_SDP;
 511
 512                 if (chan->sec_level == BT_SECURITY_HIGH)
 513                         return HCI_AT_NO_BONDING_MITM;
 514                 else
 515                         return HCI_AT_NO_BONDING;
 516         } else {
 517                 switch (chan->sec_level) {
 518                 case BT_SECURITY_HIGH:
 519                         return HCI_AT_GENERAL_BONDING_MITM;
 520                 case BT_SECURITY_MEDIUM:
 521                         return HCI_AT_GENERAL_BONDING;
 522                 default:
 523                         return HCI_AT_NO_BONDING;
 524                 }
 525         }
 526 }
 527
 528 /* Service level security */
 529 int l2cap_chan_check_security(struct l2cap_chan *chan)
 530 {
 531         struct l2cap_conn *conn = chan->conn;
 532         __u8 auth_type;
 533
 534         auth_type = l2cap_get_auth_type(chan);
 535
 536         return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
 537 }
 538
 539 static u8 l2cap_get_ident(struct l2cap_conn *conn)
 540 {
 541         u8 id;
 542
 543         /* Get next available identificator.
 544          *    1 - 128 are used by kernel.
 545          *  129 - 199 are reserved.
 546          *  200 - 254 are used by utilities like l2ping, etc.
 547          */
 548
 549         spin_lock(&conn->lock);
 550
 551         if (++conn->tx_ident > 128)
 552                 conn->tx_ident = 1;
 553
 554         id = conn->tx_ident;
 555
 556         spin_unlock(&conn->lock);
 557
 558         return id;
 559 }
 560
 561 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
 562 {
 563         struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
 564         u8 flags;
 565
 566         BT_DBG("code 0x%2.2x", code);
 567
 568         if (!skb)
 569                 return;
 570
 571         if (lmp_no_flush_capable(conn->hcon->hdev))
 572                 flags = ACL_START_NO_FLUSH;
 573         else
 574                 flags = ACL_START;
 575
 576         bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
 577         skb->priority = HCI_PRIO_MAX;
 578
 579         hci_send_acl(conn->hchan, skb, flags);
 580 }
 581
 582 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
 583 {
 584         struct hci_conn *hcon = chan->conn->hcon;
 585         u16 flags;
 586
 587         BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
 588                                                         skb->priority);
 589
 590         if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
 591                                         lmp_no_flush_capable(hcon->hdev))
 592                 flags = ACL_START_NO_FLUSH;
 593         else
 594                 flags = ACL_START;
 595
 596         bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
 597         hci_send_acl(chan->conn->hchan, skb, flags);
 598 }
 599
 600 static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control)
 601 {
 602         struct sk_buff *skb;
 603         struct l2cap_hdr *lh;
 604         struct l2cap_conn *conn = chan->conn;
 605         int count, hlen;
 606
 607         if (chan->state != BT_CONNECTED)
 608                 return;
 609
 610         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
 611                 hlen = L2CAP_EXT_HDR_SIZE;
 612         else
 613                 hlen = L2CAP_ENH_HDR_SIZE;
 614
 615         if (chan->fcs == L2CAP_FCS_CRC16)
 616                 hlen += L2CAP_FCS_SIZE;
 617
 618         BT_DBG("chan %p, control 0x%8.8x", chan, control);
 619
 620         count = min_t(unsigned int, conn->mtu, hlen);
 621
 622         control |= __set_sframe(chan);
 623
 624         if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
 625                 control |= __set_ctrl_final(chan);
 626
 627         if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
 628                 control |= __set_ctrl_poll(chan);
 629
 630         skb = bt_skb_alloc(count, GFP_ATOMIC);
 631         if (!skb)
 632                 return;
 633
 634         lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
 635         lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
 636         lh->cid = cpu_to_le16(chan->dcid);
 637
 638         __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
 639
 640         if (chan->fcs == L2CAP_FCS_CRC16) {
 641                 u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE);
 642                 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
 643         }
 644
 645         skb->priority = HCI_PRIO_MAX;
 646         l2cap_do_send(chan, skb);
 647 }
 648
 649 static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control)
 650 {
 651         if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
 652                 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
 653                 set_bit(CONN_RNR_SENT, &chan->conn_state);
 654         } else
 655                 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
 656
 657         control |= __set_reqseq(chan, chan->buffer_seq);
 658
 659         l2cap_send_sframe(chan, control);
 660 }
 661
 662 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
 663 {
 664         return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
 665 }
 666
 667 static void l2cap_do_start(struct l2cap_chan *chan)
 668 {
 669         struct l2cap_conn *conn = chan->conn;
 670
 671         if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
 672                 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
 673                         return;
 674
 675                 if (l2cap_chan_check_security(chan) &&
 676                                 __l2cap_no_conn_pending(chan)) {
 677                         struct l2cap_conn_req req;
 678                         req.scid = cpu_to_le16(chan->scid);
 679                         req.psm  = chan->psm;
 680
 681                         chan->ident = l2cap_get_ident(conn);
 682                         set_bit(CONF_CONNECT_PEND, &chan->conf_state);
 683
 684                         l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
 685                                                         sizeof(req), &req);
 686                 }
 687         } else {
 688                 struct l2cap_info_req req;
 689                 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
 690
 691                 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
 692                 conn->info_ident = l2cap_get_ident(conn);
 693
 694                 schedule_delayed_work(&conn->info_timer,
 695                                         msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
 696
 697                 l2cap_send_cmd(conn, conn->info_ident,
 698                                         L2CAP_INFO_REQ, sizeof(req), &req);
 699         }
 700 }
 701
 702 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
 703 {
 704         u32 local_feat_mask = l2cap_feat_mask;
 705         if (!disable_ertm)
 706                 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
 707
 708         switch (mode) {
 709         case L2CAP_MODE_ERTM:
 710                 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
 711         case L2CAP_MODE_STREAMING:
 712                 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
 713         default:
 714                 return 0x00;
 715         }
 716 }
 717
 718 static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
 719 {
 720         struct sock *sk;
 721         struct l2cap_disconn_req req;
 722
 723         if (!conn)
 724                 return;
 725
 726         sk = chan->sk;
 727
 728         if (chan->mode == L2CAP_MODE_ERTM) {
 729                 __clear_retrans_timer(chan);
 730                 __clear_monitor_timer(chan);
 731                 __clear_ack_timer(chan);
 732         }
 733
 734         req.dcid = cpu_to_le16(chan->dcid);
 735         req.scid = cpu_to_le16(chan->scid);
 736         l2cap_send_cmd(conn, l2cap_get_ident(conn),
 737                         L2CAP_DISCONN_REQ, sizeof(req), &req);
 738
 739         l2cap_state_change(chan, BT_DISCONN);
 740         sk->sk_err = err;
 741 }
 742
 743 /* ---- L2CAP connections ---- */
 744 static void l2cap_conn_start(struct l2cap_conn *conn)
 745 {
 746         struct l2cap_chan *chan;
 747
 748         BT_DBG("conn %p", conn);
 749
 750         rcu_read_lock();
 751
 752         list_for_each_entry_rcu(chan, &conn->chan_l, list) {
 753                 struct sock *sk = chan->sk;
 754
 755                 bh_lock_sock(sk);
 756
 757                 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
 758                         bh_unlock_sock(sk);
 759                         continue;
 760                 }
 761
 762                 if (chan->state == BT_CONNECT) {
 763                         struct l2cap_conn_req req;
 764
 765                         if (!l2cap_chan_check_security(chan) ||
 766                                         !__l2cap_no_conn_pending(chan)) {
 767                                 bh_unlock_sock(sk);
 768                                 continue;
 769                         }
 770
 771                         if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
 772                                         && test_bit(CONF_STATE2_DEVICE,
 773                                         &chan->conf_state)) {
 774                                 /* l2cap_chan_close() calls list_del(chan)
 775                                  * so release the lock */
 776                                 l2cap_chan_close(chan, ECONNRESET);
 777                                 bh_unlock_sock(sk);
 778                                 continue;
 779                         }
 780
 781                         req.scid = cpu_to_le16(chan->scid);
 782                         req.psm  = chan->psm;
 783
 784                         chan->ident = l2cap_get_ident(conn);
 785                         set_bit(CONF_CONNECT_PEND, &chan->conf_state);
 786
 787                         l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
 788                                                         sizeof(req), &req);
 789
 790                 } else if (chan->state == BT_CONNECT2) {
 791                         struct l2cap_conn_rsp rsp;
 792                         char buf[128];
 793                         rsp.scid = cpu_to_le16(chan->dcid);
 794                         rsp.dcid = cpu_to_le16(chan->scid);
 795
 796                         if (l2cap_chan_check_security(chan)) {
 797                                 if (bt_sk(sk)->defer_setup) {
 798                                         struct sock *parent = bt_sk(sk)->parent;
 799                                         rsp.result = cpu_to_le16(L2CAP_CR_PEND);
 800                                         rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
 801                                         if (parent)
 802                                                 parent->sk_data_ready(parent, 0);
 803
 804                                 } else {
 805                                         l2cap_state_change(chan, BT_CONFIG);
 806                                         rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
 807                                         rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
 808                                 }
 809                         } else {
 810                                 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
 811                                 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
 812                         }
 813
 814                         l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
 815                                                         sizeof(rsp), &rsp);
 816
 817                         if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
 818                                         rsp.result != L2CAP_CR_SUCCESS) {
 819                                 bh_unlock_sock(sk);
 820                                 continue;
 821                         }
 822
 823                         set_bit(CONF_REQ_SENT, &chan->conf_state);
 824                         l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
 825                                                 l2cap_build_conf_req(chan, buf), buf);
 826                         chan->num_conf_req++;
 827                 }
 828
 829                 bh_unlock_sock(sk);
 830         }
 831
 832         rcu_read_unlock();
 833 }
 834
 835 /* Find socket with cid and source bdaddr.
 836  * Returns closest match, locked.
 837  */
 838 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
 839 {
 840         struct l2cap_chan *c, *c1 = NULL;
 841
 842         read_lock(&chan_list_lock);
 843
 844         list_for_each_entry(c, &chan_list, global_l) {
 845                 struct sock *sk = c->sk;
 846
 847                 if (state && c->state != state)
 848                         continue;
 849
 850                 if (c->scid == cid) {
 851                         /* Exact match. */
 852                         if (!bacmp(&bt_sk(sk)->src, src)) {
 853                                 read_unlock(&chan_list_lock);
 854                                 return c;
 855                         }
 856
 857                         /* Closest match */
 858                         if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 859                                 c1 = c;
 860                 }
 861         }
 862
 863         read_unlock(&chan_list_lock);
 864
 865         return c1;
 866 }
 867
 868 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
 869 {
 870         struct sock *parent, *sk;
 871         struct l2cap_chan *chan, *pchan;
 872
 873         BT_DBG("");
 874
 875         /* Check if we have socket listening on cid */
 876         pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
 877                                                         conn->src);
 878         if (!pchan)
 879                 return;
 880
 881         parent = pchan->sk;
 882
 883         lock_sock(parent);
 884
 885         /* Check for backlog size */
 886         if (sk_acceptq_is_full(parent)) {
 887                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
 888                 goto clean;
 889         }
 890
 891         chan = pchan->ops->new_connection(pchan->data);
 892         if (!chan)
 893                 goto clean;
 894
 895         sk = chan->sk;
 896
 897         hci_conn_hold(conn->hcon);
 898
 899         bacpy(&bt_sk(sk)->src, conn->src);
 900         bacpy(&bt_sk(sk)->dst, conn->dst);
 901
 902         bt_accept_enqueue(parent, sk);
 903
 904         l2cap_chan_add(conn, chan);
 905
 906         __set_chan_timer(chan, sk->sk_sndtimeo);
 907
 908         l2cap_state_change(chan, BT_CONNECTED);
 909         parent->sk_data_ready(parent, 0);
 910
 911 clean:
 912         release_sock(parent);
 913 }
 914
 915 static void l2cap_chan_ready(struct l2cap_chan *chan)
 916 {
 917         struct sock *sk = chan->sk;
 918         struct sock *parent = bt_sk(sk)->parent;
 919
 920         BT_DBG("sk %p, parent %p", sk, parent);
 921
 922         chan->conf_state = 0;
 923         __clear_chan_timer(chan);
 924
 925         l2cap_state_change(chan, BT_CONNECTED);
 926         sk->sk_state_change(sk);
 927
 928         if (parent)
 929                 parent->sk_data_ready(parent, 0);
 930 }
 931
 932 static void l2cap_conn_ready(struct l2cap_conn *conn)
 933 {
 934         struct l2cap_chan *chan;
 935
 936         BT_DBG("conn %p", conn);
 937
 938         if (!conn->hcon->out && conn->hcon->type == LE_LINK)
 939                 l2cap_le_conn_ready(conn);
 940
 941         if (conn->hcon->out && conn->hcon->type == LE_LINK)
 942                 smp_conn_security(conn, conn->hcon->pending_sec_level);
 943
 944         rcu_read_lock();
 945
 946         list_for_each_entry_rcu(chan, &conn->chan_l, list) {
 947                 struct sock *sk = chan->sk;
 948
 949                 bh_lock_sock(sk);
 950
 951                 if (conn->hcon->type == LE_LINK) {
 952                         if (smp_conn_security(conn, chan->sec_level))
 953                                 l2cap_chan_ready(chan);
 954
 955                 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
 956                         __clear_chan_timer(chan);
 957                         l2cap_state_change(chan, BT_CONNECTED);
 958                         sk->sk_state_change(sk);
 959
 960                 } else if (chan->state == BT_CONNECT)
 961                         l2cap_do_start(chan);
 962
 963                 bh_unlock_sock(sk);
 964         }
 965
 966         rcu_read_unlock();
 967 }
 968
 969 /* Notify sockets that we cannot guaranty reliability anymore */
 970 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
 971 {
 972         struct l2cap_chan *chan;
 973
 974         BT_DBG("conn %p", conn);
 975
 976         rcu_read_lock();
 977
 978         list_for_each_entry_rcu(chan, &conn->chan_l, list) {
 979                 struct sock *sk = chan->sk;
 980
 981                 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
 982                         sk->sk_err = err;
 983         }
 984
 985         rcu_read_unlock();
 986 }
 987
 988 static void l2cap_info_timeout(struct work_struct *work)
 989 {
 990         struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
 991                                                         info_timer.work);
 992
 993         conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
 994         conn->info_ident = 0;
 995
 996         l2cap_conn_start(conn);
 997 }
 998
 999 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1000 {
1001         struct l2cap_conn *conn = hcon->l2cap_data;
1002         struct l2cap_chan *chan, *l;
1003         struct sock *sk;
1004
1005         if (!conn)
1006                 return;
1007
1008         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1009
1010         kfree_skb(conn->rx_skb);
1011
1012         /* Kill channels */
1013         list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1014                 sk = chan->sk;
1015                 lock_sock(sk);
1016                 l2cap_chan_del(chan, err);
1017                 release_sock(sk);
1018                 chan->ops->close(chan->data);
1019         }
1020
1021         hci_chan_del(conn->hchan);
1022
1023         if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1024                 cancel_delayed_work_sync(&conn->info_timer);
1025
1026         if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
1027                 cancel_delayed_work_sync(&conn->security_timer);
1028                 smp_chan_destroy(conn);
1029         }
1030
1031         hcon->l2cap_data = NULL;
1032         kfree(conn);
1033 }
1034
1035 static void security_timeout(struct work_struct *work)
1036 {
1037         struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1038                                                 security_timer.work);
1039
1040         l2cap_conn_del(conn->hcon, ETIMEDOUT);
1041 }
1042
1043 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1044 {
1045         struct l2cap_conn *conn = hcon->l2cap_data;
1046         struct hci_chan *hchan;
1047
1048         if (conn || status)
1049                 return conn;
1050
1051         hchan = hci_chan_create(hcon);
1052         if (!hchan)
1053                 return NULL;
1054
1055         conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
1056         if (!conn) {
1057                 hci_chan_del(hchan);
1058                 return NULL;
1059         }
1060
1061         hcon->l2cap_data = conn;
1062         conn->hcon = hcon;
1063         conn->hchan = hchan;
1064
1065         BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
1066
1067         if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1068                 conn->mtu = hcon->hdev->le_mtu;
1069         else
1070                 conn->mtu = hcon->hdev->acl_mtu;
1071
1072         conn->src = &hcon->hdev->bdaddr;
1073         conn->dst = &hcon->dst;
1074
1075         conn->feat_mask = 0;
1076
1077         spin_lock_init(&conn->lock);
1078
1079         INIT_LIST_HEAD(&conn->chan_l);
1080
1081         if (hcon->type == LE_LINK)
1082                 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
1083         else
1084                 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
1085
1086         conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
1087
1088         return conn;
1089 }
1090
1091 /* ---- Socket interface ---- */
1092
1093 /* Find socket with psm and source bdaddr.
1094  * Returns closest match.
1095  */
1096 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
1097 {
1098         struct l2cap_chan *c, *c1 = NULL;
1099
1100         read_lock(&chan_list_lock);
1101
1102         list_for_each_entry(c, &chan_list, global_l) {
1103                 struct sock *sk = c->sk;
1104
1105                 if (state && c->state != state)
1106                         continue;
1107
1108                 if (c->psm == psm) {
1109                         /* Exact match. */
1110                         if (!bacmp(&bt_sk(sk)->src, src)) {
1111                                 read_unlock(&chan_list_lock);
1112                                 return c;
1113                         }
1114
1115                         /* Closest match */
1116                         if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
1117                                 c1 = c;
1118                 }
1119         }
1120
1121         read_unlock(&chan_list_lock);
1122
1123         return c1;
1124 }
1125
1126 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst)
1127 {
1128         struct sock *sk = chan->sk;
1129         bdaddr_t *src = &bt_sk(sk)->src;
1130         struct l2cap_conn *conn;
1131         struct hci_conn *hcon;
1132         struct hci_dev *hdev;
1133         __u8 auth_type;
1134         int err;
1135
1136         BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
1137                                                         chan->psm);
1138
1139         hdev = hci_get_route(dst, src);
1140         if (!hdev)
1141                 return -EHOSTUNREACH;
1142
1143         hci_dev_lock(hdev);
1144
1145         lock_sock(sk);
1146
1147         /* PSM must be odd and lsb of upper byte must be 0 */
1148         if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1149                                         chan->chan_type != L2CAP_CHAN_RAW) {
1150                 err = -EINVAL;
1151                 goto done;
1152         }
1153
1154         if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1155                 err = -EINVAL;
1156                 goto done;
1157         }
1158
1159         switch (chan->mode) {
1160         case L2CAP_MODE_BASIC:
1161                 break;
1162         case L2CAP_MODE_ERTM:
1163         case L2CAP_MODE_STREAMING:
1164                 if (!disable_ertm)
1165                         break;
1166                 /* fall through */
1167         default:
1168                 err = -ENOTSUPP;
1169                 goto done;
1170         }
1171
1172         switch (sk->sk_state) {
1173         case BT_CONNECT:
1174         case BT_CONNECT2:
1175         case BT_CONFIG:
1176                 /* Already connecting */
1177                 err = 0;
1178                 goto done;
1179
1180         case BT_CONNECTED:
1181                 /* Already connected */
1182                 err = -EISCONN;
1183                 goto done;
1184
1185         case BT_OPEN:
1186         case BT_BOUND:
1187                 /* Can connect */
1188                 break;
1189
1190         default:
1191                 err = -EBADFD;
1192                 goto done;
1193         }
1194
1195         /* Set destination address and psm */
1196         bacpy(&bt_sk(sk)->dst, dst);
1197         chan->psm = psm;
1198         chan->dcid = cid;
1199
1200         auth_type = l2cap_get_auth_type(chan);
1201
1202         if (chan->dcid == L2CAP_CID_LE_DATA)
1203                 hcon = hci_connect(hdev, LE_LINK, dst,
1204                                         chan->sec_level, auth_type);
1205         else
1206                 hcon = hci_connect(hdev, ACL_LINK, dst,
1207                                         chan->sec_level, auth_type);
1208
1209         if (IS_ERR(hcon)) {
1210                 err = PTR_ERR(hcon);
1211                 goto done;
1212         }
1213
1214         conn = l2cap_conn_add(hcon, 0);
1215         if (!conn) {
1216                 hci_conn_put(hcon);
1217                 err = -ENOMEM;
1218                 goto done;
1219         }
1220
1221         /* Update source addr of the socket */
1222         bacpy(src, conn->src);
1223
1224         l2cap_chan_add(conn, chan);
1225
1226         l2cap_state_change(chan, BT_CONNECT);
1227         __set_chan_timer(chan, sk->sk_sndtimeo);
1228
1229         if (hcon->state == BT_CONNECTED) {
1230                 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1231                         __clear_chan_timer(chan);
1232                         if (l2cap_chan_check_security(chan))
1233                                 l2cap_state_change(chan, BT_CONNECTED);
1234                 } else
1235                         l2cap_do_start(chan);
1236         }
1237
1238         err = 0;
1239
1240 done:
1241         hci_dev_unlock(hdev);
1242         hci_dev_put(hdev);
1243         return err;
1244 }
1245
1246 int __l2cap_wait_ack(struct sock *sk)
1247 {
1248         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1249         DECLARE_WAITQUEUE(wait, current);
1250         int err = 0;
1251         int timeo = HZ/5;
1252
1253         add_wait_queue(sk_sleep(sk), &wait);
1254         set_current_state(TASK_INTERRUPTIBLE);
1255         while (chan->unacked_frames > 0 && chan->conn) {
1256                 if (!timeo)
1257                         timeo = HZ/5;
1258
1259                 if (signal_pending(current)) {
1260                         err = sock_intr_errno(timeo);
1261                         break;
1262                 }
1263
1264                 release_sock(sk);
1265                 timeo = schedule_timeout(timeo);
1266                 lock_sock(sk);
1267                 set_current_state(TASK_INTERRUPTIBLE);
1268
1269                 err = sock_error(sk);
1270                 if (err)
1271                         break;
1272         }
1273         set_current_state(TASK_RUNNING);
1274         remove_wait_queue(sk_sleep(sk), &wait);
1275         return err;
1276 }
1277
1278 static void l2cap_monitor_timeout(struct work_struct *work)
1279 {
1280         struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1281                                                         monitor_timer.work);
1282         struct sock *sk = chan->sk;
1283
1284         BT_DBG("chan %p", chan);
1285
1286         lock_sock(sk);
1287         if (chan->retry_count >= chan->remote_max_tx) {
1288                 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1289                 release_sock(sk);
1290                 return;
1291         }
1292
1293         chan->retry_count++;
1294         __set_monitor_timer(chan);
1295
1296         l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1297         release_sock(sk);
1298 }
1299
1300 static void l2cap_retrans_timeout(struct work_struct *work)
1301 {
1302         struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1303                                                         retrans_timer.work);
1304         struct sock *sk = chan->sk;
1305
1306         BT_DBG("chan %p", chan);
1307
1308         lock_sock(sk);
1309         chan->retry_count = 1;
1310         __set_monitor_timer(chan);
1311
1312         set_bit(CONN_WAIT_F, &chan->conn_state);
1313
1314         l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1315         release_sock(sk);
1316 }
1317
1318 static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1319 {
1320         struct sk_buff *skb;
1321
1322         while ((skb = skb_peek(&chan->tx_q)) &&
1323                         chan->unacked_frames) {
1324                 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1325                         break;
1326
1327                 skb = skb_dequeue(&chan->tx_q);
1328                 kfree_skb(skb);
1329
1330                 chan->unacked_frames--;
1331         }
1332
1333         if (!chan->unacked_frames)
1334                 __clear_retrans_timer(chan);
1335 }
1336
1337 static void l2cap_streaming_send(struct l2cap_chan *chan)
1338 {
1339         struct sk_buff *skb;
1340         u32 control;
1341         u16 fcs;
1342
1343         while ((skb = skb_dequeue(&chan->tx_q))) {
1344                 control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
1345                 control |= __set_txseq(chan, chan->next_tx_seq);
1346                 __put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
1347
1348                 if (chan->fcs == L2CAP_FCS_CRC16) {
1349                         fcs = crc16(0, (u8 *)skb->data,
1350                                                 skb->len - L2CAP_FCS_SIZE);
1351                         put_unaligned_le16(fcs,
1352                                         skb->data + skb->len - L2CAP_FCS_SIZE);
1353                 }
1354
1355                 l2cap_do_send(chan, skb);
1356
1357                 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1358         }
1359 }
1360
1361 static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
1362 {
1363         struct sk_buff *skb, *tx_skb;
1364         u16 fcs;
1365         u32 control;
1366
1367         skb = skb_peek(&chan->tx_q);
1368         if (!skb)
1369                 return;
1370
1371         while (bt_cb(skb)->tx_seq != tx_seq) {
1372                 if (skb_queue_is_last(&chan->tx_q, skb))
1373                         return;
1374
1375                 skb = skb_queue_next(&chan->tx_q, skb);
1376         }
1377
1378         if (chan->remote_max_tx &&
1379                         bt_cb(skb)->retries == chan->remote_max_tx) {
1380                 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1381                 return;
1382         }
1383
1384         tx_skb = skb_clone(skb, GFP_ATOMIC);
1385         bt_cb(skb)->retries++;
1386
1387         control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
1388         control &= __get_sar_mask(chan);
1389
1390         if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1391                 control |= __set_ctrl_final(chan);
1392
1393         control |= __set_reqseq(chan, chan->buffer_seq);
1394         control |= __set_txseq(chan, tx_seq);
1395
1396         __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
1397
1398         if (chan->fcs == L2CAP_FCS_CRC16) {
1399                 fcs = crc16(0, (u8 *)tx_skb->data,
1400                                                 tx_skb->len - L2CAP_FCS_SIZE);
1401                 put_unaligned_le16(fcs,
1402                                 tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE);
1403         }
1404
1405         l2cap_do_send(chan, tx_skb);
1406 }
1407
1408 static int l2cap_ertm_send(struct l2cap_chan *chan)
1409 {
1410         struct sk_buff *skb, *tx_skb;
1411         u16 fcs;
1412         u32 control;
1413         int nsent = 0;
1414
1415         if (chan->state != BT_CONNECTED)
1416                 return -ENOTCONN;
1417
1418         while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1419
1420                 if (chan->remote_max_tx &&
1421                                 bt_cb(skb)->retries == chan->remote_max_tx) {
1422                         l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1423                         break;
1424                 }
1425
1426                 tx_skb = skb_clone(skb, GFP_ATOMIC);
1427
1428                 bt_cb(skb)->retries++;
1429
1430                 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
1431                 control &= __get_sar_mask(chan);
1432
1433                 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1434                         control |= __set_ctrl_final(chan);
1435
1436                 control |= __set_reqseq(chan, chan->buffer_seq);
1437                 control |= __set_txseq(chan, chan->next_tx_seq);
1438
1439                 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
1440
1441                 if (chan->fcs == L2CAP_FCS_CRC16) {
1442                         fcs = crc16(0, (u8 *)skb->data,
1443                                                 tx_skb->len - L2CAP_FCS_SIZE);
1444                         put_unaligned_le16(fcs, skb->data +
1445                                                 tx_skb->len - L2CAP_FCS_SIZE);
1446                 }
1447
1448                 l2cap_do_send(chan, tx_skb);
1449
1450                 __set_retrans_timer(chan);
1451
1452                 bt_cb(skb)->tx_seq = chan->next_tx_seq;
1453
1454                 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1455
1456                 if (bt_cb(skb)->retries == 1) {
1457                         chan->unacked_frames++;
1458                         nsent++;
1459                 }
1460
1461                 chan->frames_sent++;
1462
1463                 if (skb_queue_is_last(&chan->tx_q, skb))
1464                         chan->tx_send_head = NULL;
1465                 else
1466                         chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1467         }
1468
1469         return nsent;
1470 }
1471
1472 static int l2cap_retransmit_frames(struct l2cap_chan *chan)
1473 {
1474         int ret;
1475
1476         if (!skb_queue_empty(&chan->tx_q))
1477                 chan->tx_send_head = chan->tx_q.next;
1478
1479         chan->next_tx_seq = chan->expected_ack_seq;
1480         ret = l2cap_ertm_send(chan);
1481         return ret;
1482 }
1483
1484 static void __l2cap_send_ack(struct l2cap_chan *chan)
1485 {
1486         u32 control = 0;
1487
1488         control |= __set_reqseq(chan, chan->buffer_seq);
1489
1490         if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
1491                 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
1492                 set_bit(CONN_RNR_SENT, &chan->conn_state);
1493                 l2cap_send_sframe(chan, control);
1494                 return;
1495         }
1496
1497         if (l2cap_ertm_send(chan) > 0)
1498                 return;
1499
1500         control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
1501         l2cap_send_sframe(chan, control);
1502 }
1503
1504 static void l2cap_send_ack(struct l2cap_chan *chan)
1505 {
1506         __clear_ack_timer(chan);
1507         __l2cap_send_ack(chan);
1508 }
1509
1510 static void l2cap_send_srejtail(struct l2cap_chan *chan)
1511 {
1512         struct srej_list *tail;
1513         u32 control;
1514
1515         control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
1516         control |= __set_ctrl_final(chan);
1517
1518         tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
1519         control |= __set_reqseq(chan, tail->tx_seq);
1520
1521         l2cap_send_sframe(chan, control);
1522 }
1523
1524 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1525 {
1526         struct l2cap_conn *conn = chan->conn;
1527         struct sk_buff **frag;
1528         int err, sent = 0;
1529
1530         if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1531                 return -EFAULT;
1532
1533         sent += count;
1534         len  -= count;
1535
1536         /* Continuation fragments (no L2CAP header) */
1537         frag = &skb_shinfo(skb)->frag_list;
1538         while (len) {
1539                 count = min_t(unsigned int, conn->mtu, len);
1540
1541                 *frag = chan->ops->alloc_skb(chan, count,
1542                                         msg->msg_flags & MSG_DONTWAIT, &err);
1543
1544                 if (!*frag)
1545                         return err;
1546                 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1547                         return -EFAULT;
1548
1549                 (*frag)->priority = skb->priority;
1550
1551                 sent += count;
1552                 len  -= count;
1553
1554                 frag = &(*frag)->next;
1555         }
1556
1557         return sent;
1558 }
1559
1560 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
1561                                                 struct msghdr *msg, size_t len,
1562                                                 u32 priority)
1563 {
1564         struct l2cap_conn *conn = chan->conn;
1565         struct sk_buff *skb;
1566         int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1567         struct l2cap_hdr *lh;
1568
1569         BT_DBG("chan %p len %d priority %u", chan, (int)len, priority);
1570
1571         count = min_t(unsigned int, (conn->mtu - hlen), len);
1572
1573         skb = chan->ops->alloc_skb(chan, count + hlen,
1574                                         msg->msg_flags & MSG_DONTWAIT, &err);
1575
1576         if (!skb)
1577                 return ERR_PTR(err);
1578
1579         skb->priority = priority;
1580
1581         /* Create L2CAP header */
1582         lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1583         lh->cid = cpu_to_le16(chan->dcid);
1584         lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1585         put_unaligned_le16(chan->psm, skb_put(skb, 2));
1586
1587         err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1588         if (unlikely(err < 0)) {
1589                 kfree_skb(skb);
1590                 return ERR_PTR(err);
1591         }
1592         return skb;
1593 }
1594
1595 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
1596                                                 struct msghdr *msg, size_t len,
1597                                                 u32 priority)
1598 {
1599         struct l2cap_conn *conn = chan->conn;
1600         struct sk_buff *skb;
1601         int err, count, hlen = L2CAP_HDR_SIZE;
1602         struct l2cap_hdr *lh;
1603
1604         BT_DBG("chan %p len %d", chan, (int)len);
1605
1606         count = min_t(unsigned int, (conn->mtu - hlen), len);
1607
1608         skb = chan->ops->alloc_skb(chan, count + hlen,
1609                                         msg->msg_flags & MSG_DONTWAIT, &err);
1610
1611         if (!skb)
1612                 return ERR_PTR(err);
1613
1614         skb->priority = priority;
1615
1616         /* Create L2CAP header */
1617         lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1618         lh->cid = cpu_to_le16(chan->dcid);
1619         lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1620
1621         err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1622         if (unlikely(err < 0)) {
1623                 kfree_skb(skb);
1624                 return ERR_PTR(err);
1625         }
1626         return skb;
1627 }
1628
1629 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
1630                                                 struct msghdr *msg, size_t len,
1631                                                 u32 control, u16 sdulen)
1632 {
1633         struct l2cap_conn *conn = chan->conn;
1634         struct sk_buff *skb;
1635         int err, count, hlen;
1636         struct l2cap_hdr *lh;
1637
1638         BT_DBG("chan %p len %d", chan, (int)len);
1639
1640         if (!conn)
1641                 return ERR_PTR(-ENOTCONN);
1642
1643         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1644                 hlen = L2CAP_EXT_HDR_SIZE;
1645         else
1646                 hlen = L2CAP_ENH_HDR_SIZE;
1647
1648         if (sdulen)
1649                 hlen += L2CAP_SDULEN_SIZE;
1650
1651         if (chan->fcs == L2CAP_FCS_CRC16)
1652                 hlen += L2CAP_FCS_SIZE;
1653
1654         count = min_t(unsigned int, (conn->mtu - hlen), len);
1655
1656         skb = chan->ops->alloc_skb(chan, count + hlen,
1657                                         msg->msg_flags & MSG_DONTWAIT, &err);
1658
1659         if (!skb)
1660                 return ERR_PTR(err);
1661
1662         /* Create L2CAP header */
1663         lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1664         lh->cid = cpu_to_le16(chan->dcid);
1665         lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1666
1667         __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
1668
1669         if (sdulen)
1670                 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1671
1672         err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1673         if (unlikely(err < 0)) {
1674                 kfree_skb(skb);
1675                 return ERR_PTR(err);
1676         }
1677
1678         if (chan->fcs == L2CAP_FCS_CRC16)
1679                 put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE));
1680
1681         bt_cb(skb)->retries = 0;
1682         return skb;
1683 }
1684
1685 static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1686 {
1687         struct sk_buff *skb;
1688         struct sk_buff_head sar_queue;
1689         u32 control;
1690         size_t size = 0;
1691
1692         skb_queue_head_init(&sar_queue);
1693         control = __set_ctrl_sar(chan, L2CAP_SAR_START);
1694         skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
1695         if (IS_ERR(skb))
1696                 return PTR_ERR(skb);
1697
1698         __skb_queue_tail(&sar_queue, skb);
1699         len -= chan->remote_mps;
1700         size += chan->remote_mps;
1701
1702         while (len > 0) {
1703                 size_t buflen;
1704
1705                 if (len > chan->remote_mps) {
1706                         control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE);
1707                         buflen = chan->remote_mps;
1708                 } else {
1709                         control = __set_ctrl_sar(chan, L2CAP_SAR_END);
1710                         buflen = len;
1711                 }
1712
1713                 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
1714                 if (IS_ERR(skb)) {
1715                         skb_queue_purge(&sar_queue);
1716                         return PTR_ERR(skb);
1717                 }
1718
1719                 __skb_queue_tail(&sar_queue, skb);
1720                 len -= buflen;
1721                 size += buflen;
1722         }
1723         skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1724         if (chan->tx_send_head == NULL)
1725                 chan->tx_send_head = sar_queue.next;
1726
1727         return size;
1728 }
1729
1730 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
1731                                                                 u32 priority)
1732 {
1733         struct sk_buff *skb;
1734         u32 control;
1735         int err;
1736
1737         /* Connectionless channel */
1738         if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
1739                 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
1740                 if (IS_ERR(skb))
1741                         return PTR_ERR(skb);
1742
1743                 l2cap_do_send(chan, skb);
1744                 return len;
1745         }
1746
1747         switch (chan->mode) {
1748         case L2CAP_MODE_BASIC:
1749                 /* Check outgoing MTU */
1750                 if (len > chan->omtu)
1751                         return -EMSGSIZE;
1752
1753                 /* Create a basic PDU */
1754                 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
1755                 if (IS_ERR(skb))
1756                         return PTR_ERR(skb);
1757
1758                 l2cap_do_send(chan, skb);
1759                 err = len;
1760                 break;
1761
1762         case L2CAP_MODE_ERTM:
1763         case L2CAP_MODE_STREAMING:
1764                 /* Entire SDU fits into one PDU */
1765                 if (len <= chan->remote_mps) {
1766                         control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED);
1767                         skb = l2cap_create_iframe_pdu(chan, msg, len, control,
1768                                                                         0);
1769                         if (IS_ERR(skb))
1770                                 return PTR_ERR(skb);
1771
1772                         __skb_queue_tail(&chan->tx_q, skb);
1773
1774                         if (chan->tx_send_head == NULL)
1775                                 chan->tx_send_head = skb;
1776
1777                 } else {
1778                         /* Segment SDU into multiples PDUs */
1779                         err = l2cap_sar_segment_sdu(chan, msg, len);
1780                         if (err < 0)
1781                                 return err;
1782                 }
1783
1784                 if (chan->mode == L2CAP_MODE_STREAMING) {
1785                         l2cap_streaming_send(chan);
1786                         err = len;
1787                         break;
1788                 }
1789
1790                 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
1791                                 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1792                         err = len;
1793                         break;
1794                 }
1795
1796                 err = l2cap_ertm_send(chan);
1797                 if (err >= 0)
1798                         err = len;
1799
1800                 break;
1801
1802         default:
1803                 BT_DBG("bad state %1.1x", chan->mode);
1804                 err = -EBADFD;
1805         }
1806
1807         return err;
1808 }
1809
1810 /* Copy frame to all raw sockets on that connection */
1811 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1812 {
1813         struct sk_buff *nskb;
1814         struct l2cap_chan *chan;
1815
1816         BT_DBG("conn %p", conn);
1817
1818         rcu_read_lock();
1819
1820         list_for_each_entry_rcu(chan, &conn->chan_l, list) {
1821                 struct sock *sk = chan->sk;
1822                 if (chan->chan_type != L2CAP_CHAN_RAW)
1823                         continue;
1824
1825                 /* Don't send frame to the socket it came from */
1826                 if (skb->sk == sk)
1827                         continue;
1828                 nskb = skb_clone(skb, GFP_ATOMIC);
1829                 if (!nskb)
1830                         continue;
1831
1832                 if (chan->ops->recv(chan->data, nskb))
1833                         kfree_skb(nskb);
1834         }
1835
1836         rcu_read_unlock();
1837 }
1838
1839 /* ---- L2CAP signalling commands ---- */
1840 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1841                                 u8 code, u8 ident, u16 dlen, void *data)
1842 {
1843         struct sk_buff *skb, **frag;
1844         struct l2cap_cmd_hdr *cmd;
1845         struct l2cap_hdr *lh;
1846         int len, count;
1847
1848         BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1849                         conn, code, ident, dlen);
1850
1851         len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1852         count = min_t(unsigned int, conn->mtu, len);
1853
1854         skb = bt_skb_alloc(count, GFP_ATOMIC);
1855         if (!skb)
1856                 return NULL;
1857
1858         lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1859         lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
1860
1861         if (conn->hcon->type == LE_LINK)
1862                 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1863         else
1864                 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1865
1866         cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1867         cmd->code  = code;
1868         cmd->ident = ident;
1869         cmd->len   = cpu_to_le16(dlen);
1870
1871         if (dlen) {
1872                 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1873                 memcpy(skb_put(skb, count), data, count);
1874                 data += count;
1875         }
1876
1877         len -= skb->len;
1878
1879         /* Continuation fragments (no L2CAP header) */
1880         frag = &skb_shinfo(skb)->frag_list;
1881         while (len) {
1882                 count = min_t(unsigned int, conn->mtu, len);
1883
1884                 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1885                 if (!*frag)
1886                         goto fail;
1887
1888                 memcpy(skb_put(*frag, count), data, count);
1889
1890                 len  -= count;
1891                 data += count;
1892
1893                 frag = &(*frag)->next;
1894         }
1895
1896         return skb;
1897
1898 fail:
1899         kfree_skb(skb);
1900         return NULL;
1901 }
1902
1903 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1904 {
1905         struct l2cap_conf_opt *opt = *ptr;
1906         int len;
1907
1908         len = L2CAP_CONF_OPT_SIZE + opt->len;
1909         *ptr += len;
1910
1911         *type = opt->type;
1912         *olen = opt->len;
1913
1914         switch (opt->len) {
1915         case 1:
1916                 *val = *((u8 *) opt->val);
1917                 break;
1918
1919         case 2:
1920                 *val = get_unaligned_le16(opt->val);
1921                 break;
1922
1923         case 4:
1924                 *val = get_unaligned_le32(opt->val);
1925                 break;
1926
1927         default:
1928                 *val = (unsigned long) opt->val;
1929                 break;
1930         }
1931
1932         BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1933         return len;
1934 }
1935
1936 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1937 {
1938         struct l2cap_conf_opt *opt = *ptr;
1939
1940         BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1941
1942         opt->type = type;
1943         opt->len  = len;
1944
1945         switch (len) {
1946         case 1:
1947                 *((u8 *) opt->val)  = val;
1948                 break;
1949
1950         case 2:
1951                 put_unaligned_le16(val, opt->val);
1952                 break;
1953
1954         case 4:
1955                 put_unaligned_le32(val, opt->val);
1956                 break;
1957
1958         default:
1959                 memcpy(opt->val, (void *) val, len);
1960                 break;
1961         }
1962
1963         *ptr += L2CAP_CONF_OPT_SIZE + len;
1964 }
1965
1966 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
1967 {
1968         struct l2cap_conf_efs efs;
1969
1970         switch (chan->mode) {
1971         case L2CAP_MODE_ERTM:
1972                 efs.id          = chan->local_id;
1973                 efs.stype       = chan->local_stype;
1974                 efs.msdu        = cpu_to_le16(chan->local_msdu);
1975                 efs.sdu_itime   = cpu_to_le32(chan->local_sdu_itime);
1976                 efs.acc_lat     = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
1977                 efs.flush_to    = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
1978                 break;
1979
1980         case L2CAP_MODE_STREAMING:
1981                 efs.id          = 1;
1982                 efs.stype       = L2CAP_SERV_BESTEFFORT;
1983                 efs.msdu        = cpu_to_le16(chan->local_msdu);
1984                 efs.sdu_itime   = cpu_to_le32(chan->local_sdu_itime);
1985                 efs.acc_lat     = 0;
1986                 efs.flush_to    = 0;
1987                 break;
1988
1989         default:
1990                 return;
1991         }
1992
1993         l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
1994                                                         (unsigned long) &efs);
1995 }
1996
1997 static void l2cap_ack_timeout(struct work_struct *work)
1998 {
1999         struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2000                                                         ack_timer.work);
2001
2002         BT_DBG("chan %p", chan);
2003
2004         lock_sock(chan->sk);
2005         __l2cap_send_ack(chan);
2006         release_sock(chan->sk);
2007
2008         l2cap_chan_put(chan);
2009 }
2010
2011 static inline void l2cap_ertm_init(struct l2cap_chan *chan)
2012 {
2013         chan->expected_ack_seq = 0;
2014         chan->unacked_frames = 0;
2015         chan->buffer_seq = 0;
2016         chan->num_acked = 0;
2017         chan->frames_sent = 0;
2018
2019         INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2020         INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2021         INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
2022
2023         skb_queue_head_init(&chan->srej_q);
2024
2025         INIT_LIST_HEAD(&chan->srej_l);
2026 }
2027
2028 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2029 {
2030         switch (mode) {
2031         case L2CAP_MODE_STREAMING:
2032         case L2CAP_MODE_ERTM:
2033                 if (l2cap_mode_supported(mode, remote_feat_mask))
2034                         return mode;
2035                 /* fall through */
2036         default:
2037                 return L2CAP_MODE_BASIC;
2038         }
2039 }
2040
2041 static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2042 {
2043         return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2044 }
2045
2046 static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2047 {
2048         return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2049 }
2050
2051 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2052 {
2053         if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
2054                                                 __l2cap_ews_supported(chan)) {
2055                 /* use extended control field */
2056                 set_bit(FLAG_EXT_CTRL, &chan->flags);
2057                 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2058         } else {
2059                 chan->tx_win = min_t(u16, chan->tx_win,
2060                                                 L2CAP_DEFAULT_TX_WINDOW);
2061                 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2062         }
2063 }
2064
2065 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
2066 {
2067         struct l2cap_conf_req *req = data;
2068         struct l2cap_conf_rfc rfc = { .mode = chan->mode };
2069         void *ptr = req->data;
2070         u16 size;
2071
2072         BT_DBG("chan %p", chan);
2073
2074         if (chan->num_conf_req || chan->num_conf_rsp)
2075                 goto done;
2076
2077         switch (chan->mode) {
2078         case L2CAP_MODE_STREAMING:
2079         case L2CAP_MODE_ERTM:
2080                 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
2081                         break;
2082
2083                 if (__l2cap_efs_supported(chan))
2084                         set_bit(FLAG_EFS_ENABLE, &chan->flags);
2085
2086                 /* fall through */
2087         default:
2088                 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
2089                 break;
2090         }
2091
2092 done:
2093         if (chan->imtu != L2CAP_DEFAULT_MTU)
2094                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
2095
2096         switch (chan->mode) {
2097         case L2CAP_MODE_BASIC:
2098                 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2099                                 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
2100                         break;
2101
2102                 rfc.mode            = L2CAP_MODE_BASIC;
2103                 rfc.txwin_size      = 0;
2104                 rfc.max_transmit    = 0;
2105                 rfc.retrans_timeout = 0;
2106                 rfc.monitor_timeout = 0;
2107                 rfc.max_pdu_size    = 0;
2108
2109                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2110                                                         (unsigned long) &rfc);
2111                 break;
2112
2113         case L2CAP_MODE_ERTM:
2114                 rfc.mode            = L2CAP_MODE_ERTM;
2115                 rfc.max_transmit    = chan->max_tx;
2116                 rfc.retrans_timeout = 0;
2117                 rfc.monitor_timeout = 0;
2118
2119                 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2120                                                 L2CAP_EXT_HDR_SIZE -
2121                                                 L2CAP_SDULEN_SIZE -
2122                                                 L2CAP_FCS_SIZE);
2123                 rfc.max_pdu_size = cpu_to_le16(size);
2124
2125                 l2cap_txwin_setup(chan);
2126
2127                 rfc.txwin_size = min_t(u16, chan->tx_win,
2128                                                 L2CAP_DEFAULT_TX_WINDOW);
2129
2130                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2131                                                         (unsigned long) &rfc);
2132
2133                 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2134                         l2cap_add_opt_efs(&ptr, chan);
2135
2136                 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
2137                         break;
2138
2139                 if (chan->fcs == L2CAP_FCS_NONE ||
2140                                 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
2141                         chan->fcs = L2CAP_FCS_NONE;
2142                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
2143                 }
2144
2145                 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2146                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2147                                                                 chan->tx_win);
2148                 break;
2149
2150         case L2CAP_MODE_STREAMING:
2151                 rfc.mode            = L2CAP_MODE_STREAMING;
2152                 rfc.txwin_size      = 0;
2153                 rfc.max_transmit    = 0;
2154                 rfc.retrans_timeout = 0;
2155                 rfc.monitor_timeout = 0;
2156
2157                 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2158                                                 L2CAP_EXT_HDR_SIZE -
2159                                                 L2CAP_SDULEN_SIZE -
2160                                                 L2CAP_FCS_SIZE);
2161                 rfc.max_pdu_size = cpu_to_le16(size);
2162
2163                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2164                                                         (unsigned long) &rfc);
2165
2166                 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2167                         l2cap_add_opt_efs(&ptr, chan);
2168
2169                 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
2170                         break;
2171
2172                 if (chan->fcs == L2CAP_FCS_NONE ||
2173                                 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
2174                         chan->fcs = L2CAP_FCS_NONE;
2175                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
2176                 }
2177                 break;
2178         }
2179
2180         req->dcid  = cpu_to_le16(chan->dcid);
2181         req->flags = cpu_to_le16(0);
2182
2183         return ptr - data;
2184 }
2185
2186 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
2187 {
2188         struct l2cap_conf_rsp *rsp = data;
2189         void *ptr = rsp->data;
2190         void *req = chan->conf_req;
2191         int len = chan->conf_len;
2192         int type, hint, olen;
2193         unsigned long val;
2194         struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
2195         struct l2cap_conf_efs efs;
2196         u8 remote_efs = 0;
2197         u16 mtu = L2CAP_DEFAULT_MTU;
2198         u16 result = L2CAP_CONF_SUCCESS;
2199         u16 size;
2200
2201         BT_DBG("chan %p", chan);
2202
2203         while (len >= L2CAP_CONF_OPT_SIZE) {
2204                 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
2205
2206                 hint  = type & L2CAP_CONF_HINT;
2207                 type &= L2CAP_CONF_MASK;
2208
2209                 switch (type) {
2210                 case L2CAP_CONF_MTU:
2211                         mtu = val;
2212                         break;
2213
2214                 case L2CAP_CONF_FLUSH_TO:
2215                         chan->flush_to = val;
2216                         break;
2217
2218                 case L2CAP_CONF_QOS:
2219                         break;
2220
2221                 case L2CAP_CONF_RFC:
2222                         if (olen == sizeof(rfc))
2223                                 memcpy(&rfc, (void *) val, olen);
2224                         break;
2225
2226                 case L2CAP_CONF_FCS:
2227                         if (val == L2CAP_FCS_NONE)
2228                                 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
2229                         break;
2230
2231                 case L2CAP_CONF_EFS:
2232                         remote_efs = 1;
2233                         if (olen == sizeof(efs))
2234                                 memcpy(&efs, (void *) val, olen);
2235                         break;
2236
2237                 case L2CAP_CONF_EWS:
2238                         if (!enable_hs)
2239                                 return -ECONNREFUSED;
2240
2241                         set_bit(FLAG_EXT_CTRL, &chan->flags);
2242                         set_bit(CONF_EWS_RECV, &chan->conf_state);
2243                         chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2244                         chan->remote_tx_win = val;
2245                         break;
2246
2247                 default:
2248                         if (hint)
2249                                 break;
2250
2251                         result = L2CAP_CONF_UNKNOWN;
2252                         *((u8 *) ptr++) = type;
2253                         break;
2254                 }
2255         }
2256
2257         if (chan->num_conf_rsp || chan->num_conf_req > 1)
2258                 goto done;
2259
2260         switch (chan->mode) {
2261         case L2CAP_MODE_STREAMING:
2262         case L2CAP_MODE_ERTM:
2263                 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
2264                         chan->mode = l2cap_select_mode(rfc.mode,
2265                                         chan->conn->feat_mask);
2266                         break;
2267                 }
2268
2269                 if (remote_efs) {
2270                         if (__l2cap_efs_supported(chan))
2271                                 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2272                         else
2273                                 return -ECONNREFUSED;
2274                 }
2275
2276                 if (chan->mode != rfc.mode)
2277                         return -ECONNREFUSED;
2278
2279                 break;
2280         }
2281
2282 done:
2283         if (chan->mode != rfc.mode) {
2284                 result = L2CAP_CONF_UNACCEPT;
2285                 rfc.mode = chan->mode;
2286
2287                 if (chan->num_conf_rsp == 1)
2288                         return -ECONNREFUSED;
2289
2290                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2291                                         sizeof(rfc), (unsigned long) &rfc);
2292         }
2293
2294         if (result == L2CAP_CONF_SUCCESS) {
2295                 /* Configure output options and let the other side know
2296                  * which ones we don't like. */
2297
2298                 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2299                         result = L2CAP_CONF_UNACCEPT;
2300                 else {
2301                         chan->omtu = mtu;
2302                         set_bit(CONF_MTU_DONE, &chan->conf_state);
2303                 }
2304                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
2305
2306                 if (remote_efs) {
2307                         if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2308                                         efs.stype != L2CAP_SERV_NOTRAFIC &&
2309                                         efs.stype != chan->local_stype) {
2310
2311                                 result = L2CAP_CONF_UNACCEPT;
2312
2313                                 if (chan->num_conf_req >= 1)
2314                                         return -ECONNREFUSED;
2315
2316                                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2317                                                         sizeof(efs),
2318                                                         (unsigned long) &efs);
2319                         } else {
2320                                 /* Send PENDING Conf Rsp */
2321                                 result = L2CAP_CONF_PENDING;
2322                                 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2323                         }
2324                 }
2325
2326                 switch (rfc.mode) {
2327                 case L2CAP_MODE_BASIC:
2328                         chan->fcs = L2CAP_FCS_NONE;
2329                         set_bit(CONF_MODE_DONE, &chan->conf_state);
2330                         break;
2331
2332                 case L2CAP_MODE_ERTM:
2333                         if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
2334                                 chan->remote_tx_win = rfc.txwin_size;
2335                         else
2336                                 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
2337
2338                         chan->remote_max_tx = rfc.max_transmit;
2339
2340                         size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2341                                                 chan->conn->mtu -
2342                                                 L2CAP_EXT_HDR_SIZE -
2343                                                 L2CAP_SDULEN_SIZE -
2344                                                 L2CAP_FCS_SIZE);
2345                         rfc.max_pdu_size = cpu_to_le16(size);
2346                         chan->remote_mps = size;
2347
2348                         rfc.retrans_timeout =
2349                                 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2350                         rfc.monitor_timeout =
2351                                 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
2352
2353                         set_bit(CONF_MODE_DONE, &chan->conf_state);
2354
2355                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2356                                         sizeof(rfc), (unsigned long) &rfc);
2357
2358                         if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2359                                 chan->remote_id = efs.id;
2360                                 chan->remote_stype = efs.stype;
2361                                 chan->remote_msdu = le16_to_cpu(efs.msdu);
2362                                 chan->remote_flush_to =
2363                                                 le32_to_cpu(efs.flush_to);
2364                                 chan->remote_acc_lat =
2365                                                 le32_to_cpu(efs.acc_lat);
2366                                 chan->remote_sdu_itime =
2367                                         le32_to_cpu(efs.sdu_itime);
2368                                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2369                                         sizeof(efs), (unsigned long) &efs);
2370                         }
2371                         break;
2372
2373                 case L2CAP_MODE_STREAMING:
2374                         size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2375                                                 chan->conn->mtu -
2376                                                 L2CAP_EXT_HDR_SIZE -
2377                                                 L2CAP_SDULEN_SIZE -
2378                                                 L2CAP_FCS_SIZE);
2379                         rfc.max_pdu_size = cpu_to_le16(size);
2380                         chan->remote_mps = size;
2381
2382                         set_bit(CONF_MODE_DONE, &chan->conf_state);
2383
2384                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2385                                         sizeof(rfc), (unsigned long) &rfc);
2386
2387                         break;
2388
2389                 default:
2390                         result = L2CAP_CONF_UNACCEPT;
2391
2392                         memset(&rfc, 0, sizeof(rfc));
2393                         rfc.mode = chan->mode;
2394                 }
2395
2396                 if (result == L2CAP_CONF_SUCCESS)
2397                         set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2398         }
2399         rsp->scid   = cpu_to_le16(chan->dcid);
2400         rsp->result = cpu_to_le16(result);
2401         rsp->flags  = cpu_to_le16(0x0000);
2402
2403         return ptr - data;
2404 }
2405
2406 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
2407 {
2408         struct l2cap_conf_req *req = data;
2409         void *ptr = req->data;
2410         int type, olen;
2411         unsigned long val;
2412         struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
2413         struct l2cap_conf_efs efs;
2414
2415         BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
2416
2417         while (len >= L2CAP_CONF_OPT_SIZE) {
2418                 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2419
2420                 switch (type) {
2421                 case L2CAP_CONF_MTU:
2422                         if (val < L2CAP_DEFAULT_MIN_MTU) {
2423                                 *result = L2CAP_CONF_UNACCEPT;
2424                                 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
2425                         } else
2426                                 chan->imtu = val;
2427                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
2428                         break;
2429
2430                 case L2CAP_CONF_FLUSH_TO:
2431                         chan->flush_to = val;
2432                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2433                                                         2, chan->flush_to);
2434                         break;
2435
2436                 case L2CAP_CONF_RFC:
2437                         if (olen == sizeof(rfc))
2438                                 memcpy(&rfc, (void *)val, olen);
2439
2440                         if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2441                                                         rfc.mode != chan->mode)
2442                                 return -ECONNREFUSED;
2443
2444                         chan->fcs = 0;
2445
2446                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2447                                         sizeof(rfc), (unsigned long) &rfc);
2448                         break;
2449
2450                 case L2CAP_CONF_EWS:
2451                         chan->tx_win = min_t(u16, val,
2452                                                 L2CAP_DEFAULT_EXT_WINDOW);
2453                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2454                                                         chan->tx_win);
2455                         break;
2456
2457                 case L2CAP_CONF_EFS:
2458                         if (olen == sizeof(efs))
2459                                 memcpy(&efs, (void *)val, olen);
2460
2461                         if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2462                                         efs.stype != L2CAP_SERV_NOTRAFIC &&
2463                                         efs.stype != chan->local_stype)
2464                                 return -ECONNREFUSED;
2465
2466                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2467                                         sizeof(efs), (unsigned long) &efs);
2468                         break;
2469                 }
2470         }
2471
2472         if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
2473                 return -ECONNREFUSED;
2474
2475         chan->mode = rfc.mode;
2476
2477         if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
2478                 switch (rfc.mode) {
2479                 case L2CAP_MODE_ERTM:
2480                         chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2481                         chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2482                         chan->mps    = le16_to_cpu(rfc.max_pdu_size);
2483
2484                         if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2485                                 chan->local_msdu = le16_to_cpu(efs.msdu);
2486                                 chan->local_sdu_itime =
2487                                                 le32_to_cpu(efs.sdu_itime);
2488                                 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
2489                                 chan->local_flush_to =
2490                                                 le32_to_cpu(efs.flush_to);
2491                         }
2492                         break;
2493
2494                 case L2CAP_MODE_STREAMING:
2495                         chan->mps    = le16_to_cpu(rfc.max_pdu_size);
2496                 }
2497         }
2498
2499         req->dcid   = cpu_to_le16(chan->dcid);
2500         req->flags  = cpu_to_le16(0x0000);
2501
2502         return ptr - data;
2503 }
2504
2505 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
2506 {
2507         struct l2cap_conf_rsp *rsp = data;
2508         void *ptr = rsp->data;
2509
2510         BT_DBG("chan %p", chan);
2511
2512         rsp->scid   = cpu_to_le16(chan->dcid);
2513         rsp->result = cpu_to_le16(result);
2514         rsp->flags  = cpu_to_le16(flags);
2515
2516         return ptr - data;
2517 }
2518
2519 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
2520 {
2521         struct l2cap_conn_rsp rsp;
2522         struct l2cap_conn *conn = chan->conn;
2523         u8 buf[128];
2524
2525         rsp.scid   = cpu_to_le16(chan->dcid);
2526         rsp.dcid   = cpu_to_le16(chan->scid);
2527         rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2528         rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2529         l2cap_send_cmd(conn, chan->ident,
2530                                 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2531
2532         if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
2533                 return;
2534
2535         l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2536                         l2cap_build_conf_req(chan, buf), buf);
2537         chan->num_conf_req++;
2538 }
2539
2540 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
2541 {
2542         int type, olen;
2543         unsigned long val;
2544         struct l2cap_conf_rfc rfc;
2545
2546         BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
2547
2548         if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
2549                 return;
2550
2551         while (len >= L2CAP_CONF_OPT_SIZE) {
2552                 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2553
2554                 switch (type) {
2555                 case L2CAP_CONF_RFC:
2556                         if (olen == sizeof(rfc))
2557                                 memcpy(&rfc, (void *)val, olen);
2558                         goto done;
2559                 }
2560         }
2561
2562         /* Use sane default values in case a misbehaving remote device
2563          * did not send an RFC option.
2564          */
2565         rfc.mode = chan->mode;
2566         rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
2567         rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
2568         rfc.max_pdu_size = cpu_to_le16(chan->imtu);
2569
2570         BT_ERR("Expected RFC option was not found, using defaults");
2571
2572 done:
2573         switch (rfc.mode) {
2574         case L2CAP_MODE_ERTM:
2575                 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2576                 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2577                 chan->mps    = le16_to_cpu(rfc.max_pdu_size);
2578                 break;
2579         case L2CAP_MODE_STREAMING:
2580                 chan->mps    = le16_to_cpu(rfc.max_pdu_size);
2581         }
2582 }
2583
2584 static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2585 {
2586         struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
2587
2588         if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
2589                 return 0;
2590
2591         if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2592                                         cmd->ident == conn->info_ident) {
2593                 cancel_delayed_work(&conn->info_timer);
2594
2595                 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2596                 conn->info_ident = 0;
2597
2598                 l2cap_conn_start(conn);
2599         }
2600
2601         return 0;
2602 }
2603
2604 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2605 {
2606         struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2607         struct l2cap_conn_rsp rsp;
2608         struct l2cap_chan *chan = NULL, *pchan;
2609         struct sock *parent, *sk = NULL;
2610         int result, status = L2CAP_CS_NO_INFO;
2611
2612         u16 dcid = 0, scid = __le16_to_cpu(req->scid);
2613         __le16 psm = req->psm;
2614
2615         BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2616
2617         /* Check if we have socket listening on psm */
2618         pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2619         if (!pchan) {
2620                 result = L2CAP_CR_BAD_PSM;
2621                 goto sendresp;
2622         }
2623
2624         parent = pchan->sk;
2625
2626         lock_sock(parent);
2627
2628         /* Check if the ACL is secure enough (if not SDP) */
2629         if (psm != cpu_to_le16(0x0001) &&
2630                                 !hci_conn_check_link_mode(conn->hcon)) {
2631                 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
2632                 result = L2CAP_CR_SEC_BLOCK;
2633                 goto response;
2634         }
2635
2636         result = L2CAP_CR_NO_MEM;
2637
2638         /* Check for backlog size */
2639         if (sk_acceptq_is_full(parent)) {
2640                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
2641                 goto response;
2642         }
2643
2644         chan = pchan->ops->new_connection(pchan->data);
2645         if (!chan)
2646                 goto response;
2647
2648         sk = chan->sk;
2649
2650         /* Check if we already have channel with that dcid */
2651         if (__l2cap_get_chan_by_dcid(conn, scid)) {
2652                 sock_set_flag(sk, SOCK_ZAPPED);
2653                 chan->ops->close(chan->data);
2654                 goto response;
2655         }
2656
2657         hci_conn_hold(conn->hcon);
2658
2659         bacpy(&bt_sk(sk)->src, conn->src);
2660         bacpy(&bt_sk(sk)->dst, conn->dst);
2661         chan->psm  = psm;
2662         chan->dcid = scid;
2663
2664         bt_accept_enqueue(parent, sk);
2665
2666         l2cap_chan_add(conn, chan);
2667
2668         dcid = chan->scid;
2669
2670         __set_chan_timer(chan, sk->sk_sndtimeo);
2671
2672         chan->ident = cmd->ident;
2673
2674         if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2675                 if (l2cap_chan_check_security(chan)) {
2676                         if (bt_sk(sk)->defer_setup) {
2677                                 l2cap_state_change(chan, BT_CONNECT2);
2678                                 result = L2CAP_CR_PEND;
2679                                 status = L2CAP_CS_AUTHOR_PEND;
2680                                 parent->sk_data_ready(parent, 0);
2681                         } else {
2682                                 l2cap_state_change(chan, BT_CONFIG);
2683                                 result = L2CAP_CR_SUCCESS;
2684                                 status = L2CAP_CS_NO_INFO;
2685                         }
2686                 } else {
2687                         l2cap_state_change(chan, BT_CONNECT2);
2688                         result = L2CAP_CR_PEND;
2689                         status = L2CAP_CS_AUTHEN_PEND;
2690                 }
2691         } else {
2692                 l2cap_state_change(chan, BT_CONNECT2);
2693                 result = L2CAP_CR_PEND;
2694                 status = L2CAP_CS_NO_INFO;
2695         }
2696
2697 response:
2698         release_sock(parent);
2699
2700 sendresp:
2701         rsp.scid   = cpu_to_le16(scid);
2702         rsp.dcid   = cpu_to_le16(dcid);
2703         rsp.result = cpu_to_le16(result);
2704         rsp.status = cpu_to_le16(status);
2705         l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2706
2707         if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2708                 struct l2cap_info_req info;
2709                 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2710
2711                 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2712                 conn->info_ident = l2cap_get_ident(conn);
2713
2714                 schedule_delayed_work(&conn->info_timer,
2715                                         msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2716
2717                 l2cap_send_cmd(conn, conn->info_ident,
2718                                         L2CAP_INFO_REQ, sizeof(info), &info);
2719         }
2720
2721         if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2722                                 result == L2CAP_CR_SUCCESS) {
2723                 u8 buf[128];
2724                 set_bit(CONF_REQ_SENT, &chan->conf_state);
2725                 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2726                                         l2cap_build_conf_req(chan, buf), buf);
2727                 chan->num_conf_req++;
2728         }
2729
2730         return 0;
2731 }
2732
2733 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2734 {
2735         struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2736         u16 scid, dcid, result, status;
2737         struct l2cap_chan *chan;
2738         struct sock *sk;
2739         u8 req[128];
2740
2741         scid   = __le16_to_cpu(rsp->scid);
2742         dcid   = __le16_to_cpu(rsp->dcid);
2743         result = __le16_to_cpu(rsp->result);
2744         status = __le16_to_cpu(rsp->status);
2745
2746         BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2747
2748         if (scid) {
2749                 chan = l2cap_get_chan_by_scid(conn, scid);
2750                 if (!chan)
2751                         return -EFAULT;
2752         } else {
2753                 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
2754                 if (!chan)
2755                         return -EFAULT;
2756         }
2757
2758         sk = chan->sk;
2759
2760         switch (result) {
2761         case L2CAP_CR_SUCCESS:
2762                 l2cap_state_change(chan, BT_CONFIG);
2763                 chan->ident = 0;
2764                 chan->dcid = dcid;
2765                 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
2766
2767                 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
2768                         break;
2769
2770                 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2771                                         l2cap_build_conf_req(chan, req), req);
2772                 chan->num_conf_req++;
2773                 break;
2774
2775         case L2CAP_CR_PEND:
2776                 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
2777                 break;
2778
2779         default:
2780                 l2cap_chan_del(chan, ECONNREFUSED);
2781                 break;
2782         }
2783
2784         release_sock(sk);
2785         return 0;
2786 }
2787
2788 static inline void set_default_fcs(struct l2cap_chan *chan)
2789 {
2790         /* FCS is enabled only in ERTM or streaming mode, if one or both
2791          * sides request it.
2792          */
2793         if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
2794                 chan->fcs = L2CAP_FCS_NONE;
2795         else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
2796                 chan->fcs = L2CAP_FCS_CRC16;
2797 }
2798
2799 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2800 {
2801         struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2802         u16 dcid, flags;
2803         u8 rsp[64];
2804         struct l2cap_chan *chan;
2805         struct sock *sk;
2806         int len;
2807
2808         dcid  = __le16_to_cpu(req->dcid);
2809         flags = __le16_to_cpu(req->flags);
2810
2811         BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2812
2813         chan = l2cap_get_chan_by_scid(conn, dcid);
2814         if (!chan)
2815                 return -ENOENT;
2816
2817         sk = chan->sk;
2818
2819         if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
2820                 struct l2cap_cmd_rej_cid rej;
2821
2822                 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
2823                 rej.scid = cpu_to_le16(chan->scid);
2824                 rej.dcid = cpu_to_le16(chan->dcid);
2825
2826                 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2827                                 sizeof(rej), &rej);
2828                 goto unlock;
2829         }
2830
2831         /* Reject if config buffer is too small. */
2832         len = cmd_len - sizeof(*req);
2833         if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
2834                 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2835                                 l2cap_build_conf_rsp(chan, rsp,
2836                                         L2CAP_CONF_REJECT, flags), rsp);
2837                 goto unlock;
2838         }
2839
2840         /* Store config. */
2841         memcpy(chan->conf_req + chan->conf_len, req->data, len);
2842         chan->conf_len += len;
2843
2844         if (flags & 0x0001) {
2845                 /* Incomplete config. Send empty response. */
2846                 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2847                                 l2cap_build_conf_rsp(chan, rsp,
2848                                         L2CAP_CONF_SUCCESS, 0x0001), rsp);
2849                 goto unlock;
2850         }
2851
2852         /* Complete config. */
2853         len = l2cap_parse_conf_req(chan, rsp);
2854         if (len < 0) {
2855                 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2856                 goto unlock;
2857         }
2858
2859         l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
2860         chan->num_conf_rsp++;
2861
2862         /* Reset config buffer. */
2863         chan->conf_len = 0;
2864
2865         if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
2866                 goto unlock;
2867
2868         if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
2869                 set_default_fcs(chan);
2870
2871                 l2cap_state_change(chan, BT_CONNECTED);
2872
2873                 chan->next_tx_seq = 0;
2874                 chan->expected_tx_seq = 0;
2875                 skb_queue_head_init(&chan->tx_q);
2876                 if (chan->mode == L2CAP_MODE_ERTM)
2877                         l2cap_ertm_init(chan);
2878
2879                 l2cap_chan_ready(chan);
2880                 goto unlock;
2881         }
2882
2883         if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
2884                 u8 buf[64];
2885                 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2886                                         l2cap_build_conf_req(chan, buf), buf);
2887                 chan->num_conf_req++;
2888         }
2889
2890         /* Got Conf Rsp PENDING from remote side and asume we sent
2891            Conf Rsp PENDING in the code above */
2892         if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
2893                         test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2894
2895                 /* check compatibility */
2896
2897                 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2898                 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2899
2900                 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2901                                         l2cap_build_conf_rsp(chan, rsp,
2902                                         L2CAP_CONF_SUCCESS, 0x0000), rsp);
2903         }
2904
2905 unlock:
2906         release_sock(sk);
2907         return 0;
2908 }
2909
2910 static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2911 {
2912         struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2913         u16 scid, flags, result;
2914         struct l2cap_chan *chan;
2915         struct sock *sk;
2916         int len = cmd->len - sizeof(*rsp);
2917
2918         scid   = __le16_to_cpu(rsp->scid);
2919         flags  = __le16_to_cpu(rsp->flags);
2920         result = __le16_to_cpu(rsp->result);
2921
2922         BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2923                         scid, flags, result);
2924
2925         chan = l2cap_get_chan_by_scid(conn, scid);
2926         if (!chan)
2927                 return 0;
2928
2929         sk = chan->sk;
2930
2931         switch (result) {
2932         case L2CAP_CONF_SUCCESS:
2933                 l2cap_conf_rfc_get(chan, rsp->data, len);
2934                 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
2935                 break;
2936
2937         case L2CAP_CONF_PENDING:
2938                 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
2939
2940                 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2941                         char buf[64];
2942
2943                         len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2944                                                                 buf, &result);
2945                         if (len < 0) {
2946                                 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2947                                 goto done;
2948                         }
2949
2950                         /* check compatibility */
2951
2952                         clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2953                         set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2954
2955                         l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2956                                                 l2cap_build_conf_rsp(chan, buf,
2957                                                 L2CAP_CONF_SUCCESS, 0x0000), buf);
2958                 }
2959                 goto done;
2960
2961         case L2CAP_CONF_UNACCEPT:
2962                 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
2963                         char req[64];
2964
2965                         if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2966                                 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2967                                 goto done;
2968                         }
2969
2970                         /* throw out any old stored conf requests */
2971                         result = L2CAP_CONF_SUCCESS;
2972                         len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2973                                                                 req, &result);
2974                         if (len < 0) {
2975                                 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2976                                 goto done;
2977                         }
2978
2979                         l2cap_send_cmd(conn, l2cap_get_ident(conn),
2980                                                 L2CAP_CONF_REQ, len, req);
2981                         chan->num_conf_req++;
2982                         if (result != L2CAP_CONF_SUCCESS)
2983                                 goto done;
2984                         break;
2985                 }
2986
2987         default:
2988                 sk->sk_err = ECONNRESET;
2989                 __set_chan_timer(chan,
2990                                 msecs_to_jiffies(L2CAP_DISC_REJ_TIMEOUT));
2991                 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2992                 goto done;
2993         }
2994
2995         if (flags & 0x01)
2996                 goto done;
2997
2998         set_bit(CONF_INPUT_DONE, &chan->conf_state);
2999
3000         if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
3001                 set_default_fcs(chan);
3002
3003                 l2cap_state_change(chan, BT_CONNECTED);
3004                 chan->next_tx_seq = 0;
3005                 chan->expected_tx_seq = 0;
3006                 skb_queue_head_init(&chan->tx_q);
3007                 if (chan->mode ==  L2CAP_MODE_ERTM)
3008                         l2cap_ertm_init(chan);
3009
3010                 l2cap_chan_ready(chan);
3011         }
3012
3013 done:
3014         release_sock(sk);
3015         return 0;
3016 }
3017
3018 static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3019 {
3020         struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3021         struct l2cap_disconn_rsp rsp;
3022         u16 dcid, scid;
3023         struct l2cap_chan *chan;
3024         struct sock *sk;
3025
3026         scid = __le16_to_cpu(req->scid);
3027         dcid = __le16_to_cpu(req->dcid);
3028
3029         BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3030
3031         chan = l2cap_get_chan_by_scid(conn, dcid);
3032         if (!chan)
3033                 return 0;
3034
3035         sk = chan->sk;
3036
3037         rsp.dcid = cpu_to_le16(chan->scid);
3038         rsp.scid = cpu_to_le16(chan->dcid);
3039         l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3040
3041         sk->sk_shutdown = SHUTDOWN_MASK;
3042
3043         l2cap_chan_del(chan, ECONNRESET);
3044         release_sock(sk);
3045
3046         chan->ops->close(chan->data);
3047         return 0;
3048 }
3049
3050 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3051 {
3052         struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3053         u16 dcid, scid;
3054         struct l2cap_chan *chan;
3055         struct sock *sk;
3056
3057         scid = __le16_to_cpu(rsp->scid);
3058         dcid = __le16_to_cpu(rsp->dcid);
3059
3060         BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3061
3062         chan = l2cap_get_chan_by_scid(conn, scid);
3063         if (!chan)
3064                 return 0;
3065
3066         sk = chan->sk;
3067
3068         l2cap_chan_del(chan, 0);
3069         release_sock(sk);
3070
3071         chan->ops->close(chan->data);
3072         return 0;
3073 }
3074
3075 static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3076 {
3077         struct l2cap_info_req *req = (struct l2cap_info_req *) data;
3078         u16 type;
3079
3080         type = __le16_to_cpu(req->type);
3081
3082         BT_DBG("type 0x%4.4x", type);
3083
3084         if (type == L2CAP_IT_FEAT_MASK) {
3085                 u8 buf[8];
3086                 u32 feat_mask = l2cap_feat_mask;
3087                 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3088                 rsp->type   = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3089                 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3090                 if (!disable_ertm)
3091                         feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3092                                                          | L2CAP_FEAT_FCS;
3093                 if (enable_hs)
3094                         feat_mask |= L2CAP_FEAT_EXT_FLOW
3095                                                 | L2CAP_FEAT_EXT_WINDOW;
3096
3097                 put_unaligned_le32(feat_mask, rsp->data);
3098                 l2cap_send_cmd(conn, cmd->ident,
3099                                         L2CAP_INFO_RSP, sizeof(buf), buf);
3100         } else if (type == L2CAP_IT_FIXED_CHAN) {
3101                 u8 buf[12];
3102                 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3103
3104                 if (enable_hs)
3105                         l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3106                 else
3107                         l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3108
3109                 rsp->type   = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3110                 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3111                 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
3112                 l2cap_send_cmd(conn, cmd->ident,
3113                                         L2CAP_INFO_RSP, sizeof(buf), buf);
3114         } else {
3115                 struct l2cap_info_rsp rsp;
3116                 rsp.type   = cpu_to_le16(type);
3117                 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3118                 l2cap_send_cmd(conn, cmd->ident,
3119                                         L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3120         }
3121
3122         return 0;
3123 }
3124
3125 static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3126 {
3127         struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3128         u16 type, result;
3129
3130         type   = __le16_to_cpu(rsp->type);
3131         result = __le16_to_cpu(rsp->result);
3132
3133         BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3134
3135         /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3136         if (cmd->ident != conn->info_ident ||
3137                         conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3138                 return 0;
3139
3140         cancel_delayed_work(&conn->info_timer);
3141
3142         if (result != L2CAP_IR_SUCCESS) {
3143                 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3144                 conn->info_ident = 0;
3145
3146                 l2cap_conn_start(conn);
3147
3148                 return 0;
3149         }
3150
3151         if (type == L2CAP_IT_FEAT_MASK) {
3152                 conn->feat_mask = get_unaligned_le32(rsp->data);
3153
3154                 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
3155                         struct l2cap_info_req req;
3156                         req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3157
3158                         conn->info_ident = l2cap_get_ident(conn);
3159
3160                         l2cap_send_cmd(conn, conn->info_ident,
3161                                         L2CAP_INFO_REQ, sizeof(req), &req);
3162                 } else {
3163                         conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3164                         conn->info_ident = 0;
3165
3166                         l2cap_conn_start(conn);
3167                 }
3168         } else if (type == L2CAP_IT_FIXED_CHAN) {
3169                 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3170                 conn->info_ident = 0;
3171
3172                 l2cap_conn_start(conn);
3173         }
3174
3175         return 0;
3176 }
3177
3178 static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3179                                         struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3180                                         void *data)
3181 {
3182         struct l2cap_create_chan_req *req = data;
3183         struct l2cap_create_chan_rsp rsp;
3184         u16 psm, scid;
3185
3186         if (cmd_len != sizeof(*req))
3187                 return -EPROTO;
3188
3189         if (!enable_hs)
3190                 return -EINVAL;
3191
3192         psm = le16_to_cpu(req->psm);
3193         scid = le16_to_cpu(req->scid);
3194
3195         BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
3196
3197         /* Placeholder: Always reject */
3198         rsp.dcid = 0;
3199         rsp.scid = cpu_to_le16(scid);
3200         rsp.result = L2CAP_CR_NO_MEM;
3201         rsp.status = L2CAP_CS_NO_INFO;
3202
3203         l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
3204                        sizeof(rsp), &rsp);
3205
3206         return 0;
3207 }
3208
3209 static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
3210                                         struct l2cap_cmd_hdr *cmd, void *data)
3211 {
3212         BT_DBG("conn %p", conn);
3213
3214         return l2cap_connect_rsp(conn, cmd, data);
3215 }
3216
3217 static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
3218                                                         u16 icid, u16 result)
3219 {
3220         struct l2cap_move_chan_rsp rsp;
3221
3222         BT_DBG("icid %d, result %d", icid, result);
3223
3224         rsp.icid = cpu_to_le16(icid);
3225         rsp.result = cpu_to_le16(result);
3226
3227         l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
3228 }
3229
3230 static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
3231                                 struct l2cap_chan *chan, u16 icid, u16 result)
3232 {
3233         struct l2cap_move_chan_cfm cfm;
3234         u8 ident;
3235
3236         BT_DBG("icid %d, result %d", icid, result);
3237
3238         ident = l2cap_get_ident(conn);
3239         if (chan)
3240                 chan->ident = ident;
3241
3242         cfm.icid = cpu_to_le16(icid);
3243         cfm.result = cpu_to_le16(result);
3244
3245         l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
3246 }
3247
3248 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
3249                                                                 u16 icid)
3250 {
3251         struct l2cap_move_chan_cfm_rsp rsp;
3252
3253         BT_DBG("icid %d", icid);
3254
3255         rsp.icid = cpu_to_le16(icid);
3256         l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
3257 }
3258
3259 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
3260                         struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3261 {
3262         struct l2cap_move_chan_req *req = data;
3263         u16 icid = 0;
3264         u16 result = L2CAP_MR_NOT_ALLOWED;
3265
3266         if (cmd_len != sizeof(*req))
3267                 return -EPROTO;
3268
3269         icid = le16_to_cpu(req->icid);
3270
3271         BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
3272
3273         if (!enable_hs)
3274                 return -EINVAL;
3275
3276         /* Placeholder: Always refuse */
3277         l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
3278
3279         return 0;
3280 }
3281
3282 static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
3283                         struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3284 {
3285         struct l2cap_move_chan_rsp *rsp = data;
3286         u16 icid, result;
3287
3288         if (cmd_len != sizeof(*rsp))
3289                 return -EPROTO;
3290
3291         icid = le16_to_cpu(rsp->icid);
3292         result = le16_to_cpu(rsp->result);
3293
3294         BT_DBG("icid %d, result %d", icid, result);
3295
3296         /* Placeholder: Always unconfirmed */
3297         l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
3298
3299         return 0;
3300 }
3301
3302 static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
3303                         struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3304 {
3305         struct l2cap_move_chan_cfm *cfm = data;
3306         u16 icid, result;
3307
3308         if (cmd_len != sizeof(*cfm))
3309                 return -EPROTO;
3310
3311         icid = le16_to_cpu(cfm->icid);
3312         result = le16_to_cpu(cfm->result);
3313
3314         BT_DBG("icid %d, result %d", icid, result);
3315
3316         l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
3317
3318         return 0;
3319 }
3320
3321 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
3322                         struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3323 {
3324         struct l2cap_move_chan_cfm_rsp *rsp = data;
3325         u16 icid;
3326
3327         if (cmd_len != sizeof(*rsp))
3328                 return -EPROTO;
3329
3330         icid = le16_to_cpu(rsp->icid);
3331
3332         BT_DBG("icid %d", icid);
3333
3334         return 0;
3335 }
3336
3337 static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
3338                                                         u16 to_multiplier)
3339 {
3340         u16 max_latency;
3341
3342         if (min > max || min < 6 || max > 3200)
3343                 return -EINVAL;
3344
3345         if (to_multiplier < 10 || to_multiplier > 3200)
3346                 return -EINVAL;
3347
3348         if (max >= to_multiplier * 8)
3349                 return -EINVAL;
3350
3351         max_latency = (to_multiplier * 8 / max) - 1;
3352         if (latency > 499 || latency > max_latency)
3353                 return -EINVAL;
3354
3355         return 0;
3356 }
3357
3358 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
3359                                         struct l2cap_cmd_hdr *cmd, u8 *data)
3360 {
3361         struct hci_conn *hcon = conn->hcon;
3362         struct l2cap_conn_param_update_req *req;
3363         struct l2cap_conn_param_update_rsp rsp;
3364         u16 min, max, latency, to_multiplier, cmd_len;
3365         int err;
3366
3367         if (!(hcon->link_mode & HCI_LM_MASTER))
3368                 return -EINVAL;
3369
3370         cmd_len = __le16_to_cpu(cmd->len);
3371         if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
3372                 return -EPROTO;
3373
3374         req = (struct l2cap_conn_param_update_req *) data;
3375         min             = __le16_to_cpu(req->min);
3376         max             = __le16_to_cpu(req->max);
3377         latency         = __le16_to_cpu(req->latency);
3378         to_multiplier   = __le16_to_cpu(req->to_multiplier);
3379
3380         BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
3381                                                 min, max, latency, to_multiplier);
3382
3383         memset(&rsp, 0, sizeof(rsp));
3384
3385         err = l2cap_check_conn_param(min, max, latency, to_multiplier);
3386         if (err)
3387                 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
3388         else
3389                 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
3390
3391         l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
3392                                                         sizeof(rsp), &rsp);
3393
3394         if (!err)
3395                 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
3396
3397         return 0;
3398 }
3399
3400 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
3401                         struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3402 {
3403         int err = 0;
3404
3405         switch (cmd->code) {
3406         case L2CAP_COMMAND_REJ:
3407                 l2cap_command_rej(conn, cmd, data);
3408                 break;
3409
3410         case L2CAP_CONN_REQ:
3411                 err = l2cap_connect_req(conn, cmd, data);
3412                 break;
3413
3414         case L2CAP_CONN_RSP:
3415                 err = l2cap_connect_rsp(conn, cmd, data);
3416                 break;
3417
3418         case L2CAP_CONF_REQ:
3419                 err = l2cap_config_req(conn, cmd, cmd_len, data);
3420                 break;
3421
3422         case L2CAP_CONF_RSP:
3423                 err = l2cap_config_rsp(conn, cmd, data);
3424                 break;
3425
3426         case L2CAP_DISCONN_REQ:
3427                 err = l2cap_disconnect_req(conn, cmd, data);
3428                 break;
3429
3430         case L2CAP_DISCONN_RSP:
3431                 err = l2cap_disconnect_rsp(conn, cmd, data);
3432                 break;
3433
3434         case L2CAP_ECHO_REQ:
3435                 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
3436                 break;
3437
3438         case L2CAP_ECHO_RSP:
3439                 break;
3440
3441         case L2CAP_INFO_REQ:
3442                 err = l2cap_information_req(conn, cmd, data);
3443                 break;
3444
3445         case L2CAP_INFO_RSP:
3446                 err = l2cap_information_rsp(conn, cmd, data);
3447                 break;
3448
3449         case L2CAP_CREATE_CHAN_REQ:
3450                 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
3451                 break;
3452
3453         case L2CAP_CREATE_CHAN_RSP:
3454                 err = l2cap_create_channel_rsp(conn, cmd, data);
3455                 break;
3456
3457         case L2CAP_MOVE_CHAN_REQ:
3458                 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
3459                 break;
3460
3461         case L2CAP_MOVE_CHAN_RSP:
3462                 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
3463                 break;
3464
3465         case L2CAP_MOVE_CHAN_CFM:
3466                 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
3467                 break;
3468
3469         case L2CAP_MOVE_CHAN_CFM_RSP:
3470                 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
3471                 break;
3472
3473         default:
3474                 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
3475                 err = -EINVAL;
3476                 break;
3477         }
3478
3479         return err;
3480 }
3481
3482 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
3483                                         struct l2cap_cmd_hdr *cmd, u8 *data)
3484 {
3485         switch (cmd->code) {
3486         case L2CAP_COMMAND_REJ:
3487                 return 0;
3488
3489         case L2CAP_CONN_PARAM_UPDATE_REQ:
3490                 return l2cap_conn_param_update_req(conn, cmd, data);
3491
3492         case L2CAP_CONN_PARAM_UPDATE_RSP:
3493                 return 0;
3494
3495         default:
3496                 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
3497                 return -EINVAL;
3498         }
3499 }
3500
3501 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
3502                                                         struct sk_buff *skb)
3503 {
3504         u8 *data = skb->data;
3505         int len = skb->len;
3506         struct l2cap_cmd_hdr cmd;
3507         int err;
3508
3509         l2cap_raw_recv(conn, skb);
3510
3511         while (len >= L2CAP_CMD_HDR_SIZE) {
3512                 u16 cmd_len;
3513                 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3514                 data += L2CAP_CMD_HDR_SIZE;
3515                 len  -= L2CAP_CMD_HDR_SIZE;
3516
3517                 cmd_len = le16_to_cpu(cmd.len);
3518
3519                 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
3520
3521                 if (cmd_len > len || !cmd.ident) {
3522                         BT_DBG("corrupted command");
3523                         break;
3524                 }
3525
3526                 if (conn->hcon->type == LE_LINK)
3527                         err = l2cap_le_sig_cmd(conn, &cmd, data);
3528                 else
3529                         err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
3530
3531                 if (err) {
3532                         struct l2cap_cmd_rej_unk rej;
3533
3534                         BT_ERR("Wrong link type (%d)", err);
3535
3536                         /* FIXME: Map err to a valid reason */
3537                         rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
3538                         l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3539                 }
3540
3541                 data += cmd_len;
3542                 len  -= cmd_len;
3543         }
3544
3545         kfree_skb(skb);
3546 }
3547
3548 static int l2cap_check_fcs(struct l2cap_chan *chan,  struct sk_buff *skb)
3549 {
3550         u16 our_fcs, rcv_fcs;
3551         int hdr_size;
3552
3553         if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3554                 hdr_size = L2CAP_EXT_HDR_SIZE;
3555         else
3556                 hdr_size = L2CAP_ENH_HDR_SIZE;
3557
3558         if (chan->fcs == L2CAP_FCS_CRC16) {
3559                 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
3560                 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3561                 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3562
3563                 if (our_fcs != rcv_fcs)
3564                         return -EBADMSG;
3565         }
3566         return 0;
3567 }
3568
3569 static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
3570 {
3571         u32 control = 0;
3572
3573         chan->frames_sent = 0;
3574
3575         control |= __set_reqseq(chan, chan->buffer_seq);
3576
3577         if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3578                 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
3579                 l2cap_send_sframe(chan, control);
3580                 set_bit(CONN_RNR_SENT, &chan->conn_state);
3581         }
3582
3583         if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
3584                 l2cap_retransmit_frames(chan);
3585
3586         l2cap_ertm_send(chan);
3587
3588         if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
3589                         chan->frames_sent == 0) {
3590                 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
3591                 l2cap_send_sframe(chan, control);
3592         }
3593 }
3594
3595 static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
3596 {
3597         struct sk_buff *next_skb;
3598         int tx_seq_offset, next_tx_seq_offset;
3599
3600         bt_cb(skb)->tx_seq = tx_seq;
3601         bt_cb(skb)->sar = sar;
3602
3603         next_skb = skb_peek(&chan->srej_q);
3604
3605         tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
3606
3607         while (next_skb) {
3608                 if (bt_cb(next_skb)->tx_seq == tx_seq)
3609                         return -EINVAL;
3610
3611                 next_tx_seq_offset = __seq_offset(chan,
3612                                 bt_cb(next_skb)->tx_seq, chan->buffer_seq);
3613
3614                 if (next_tx_seq_offset > tx_seq_offset) {
3615                         __skb_queue_before(&chan->srej_q, next_skb, skb);
3616                         return 0;
3617                 }
3618
3619                 if (skb_queue_is_last(&chan->srej_q, next_skb))
3620                         next_skb = NULL;
3621                 else
3622                         next_skb = skb_queue_next(&chan->srej_q, next_skb);
3623         }
3624
3625         __skb_queue_tail(&chan->srej_q, skb);
3626
3627         return 0;
3628 }
3629
3630 static void append_skb_frag(struct sk_buff *skb,
3631                         struct sk_buff *new_frag, struct sk_buff **last_frag)
3632 {
3633         /* skb->len reflects data in skb as well as all fragments
3634          * skb->data_len reflects only data in fragments
3635          */
3636         if (!skb_has_frag_list(skb))
3637                 skb_shinfo(skb)->frag_list = new_frag;
3638
3639         new_frag->next = NULL;
3640
3641         (*last_frag)->next = new_frag;
3642         *last_frag = new_frag;
3643
3644         skb->len += new_frag->len;
3645         skb->data_len += new_frag->len;
3646         skb->truesize += new_frag->truesize;
3647 }
3648
3649 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
3650 {
3651         int err = -EINVAL;
3652
3653         switch (__get_ctrl_sar(chan, control)) {
3654         case L2CAP_SAR_UNSEGMENTED:
3655                 if (chan->sdu)
3656                         break;
3657
3658                 err = chan->ops->recv(chan->data, skb);
3659                 break;
3660
3661         case L2CAP_SAR_START:
3662                 if (chan->sdu)
3663                         break;
3664
3665                 chan->sdu_len = get_unaligned_le16(skb->data);
3666                 skb_pull(skb, L2CAP_SDULEN_SIZE);
3667
3668                 if (chan->sdu_len > chan->imtu) {
3669                         err = -EMSGSIZE;
3670                         break;
3671                 }
3672
3673                 if (skb->len >= chan->sdu_len)
3674                         break;
3675
3676                 chan->sdu = skb;
3677                 chan->sdu_last_frag = skb;
3678
3679                 skb = NULL;
3680                 err = 0;
3681                 break;
3682
3683         case L2CAP_SAR_CONTINUE:
3684                 if (!chan->sdu)
3685                         break;
3686
3687                 append_skb_frag(chan->sdu, skb,
3688                                 &chan->sdu_last_frag);
3689                 skb = NULL;
3690
3691                 if (chan->sdu->len >= chan->sdu_len)
3692                         break;
3693
3694                 err = 0;
3695                 break;
3696
3697         case L2CAP_SAR_END:
3698                 if (!chan->sdu)
3699                         break;
3700
3701                 append_skb_frag(chan->sdu, skb,
3702                                 &chan->sdu_last_frag);
3703                 skb = NULL;
3704
3705                 if (chan->sdu->len != chan->sdu_len)
3706                         break;
3707
3708                 err = chan->ops->recv(chan->data, chan->sdu);
3709
3710                 if (!err) {
3711                         /* Reassembly complete */
3712                         chan->sdu = NULL;
3713                         chan->sdu_last_frag = NULL;
3714                         chan->sdu_len = 0;
3715                 }
3716                 break;
3717         }
3718
3719         if (err) {
3720                 kfree_skb(skb);
3721                 kfree_skb(chan->sdu);
3722                 chan->sdu = NULL;
3723                 chan->sdu_last_frag = NULL;
3724                 chan->sdu_len = 0;
3725         }
3726
3727         return err;
3728 }
3729
3730 static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
3731 {
3732         BT_DBG("chan %p, Enter local busy", chan);
3733
3734         set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3735
3736         __set_ack_timer(chan);
3737 }
3738
3739 static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
3740 {
3741         u32 control;
3742
3743         if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
3744                 goto done;
3745
3746         control = __set_reqseq(chan, chan->buffer_seq);
3747         control |= __set_ctrl_poll(chan);
3748         control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
3749         l2cap_send_sframe(chan, control);
3750         chan->retry_count = 1;
3751
3752         __clear_retrans_timer(chan);
3753         __set_monitor_timer(chan);
3754
3755         set_bit(CONN_WAIT_F, &chan->conn_state);
3756
3757 done:
3758         clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3759         clear_bit(CONN_RNR_SENT, &chan->conn_state);
3760
3761         BT_DBG("chan %p, Exit local busy", chan);
3762 }
3763
3764 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
3765 {
3766         if (chan->mode == L2CAP_MODE_ERTM) {
3767                 if (busy)
3768                         l2cap_ertm_enter_local_busy(chan);
3769                 else
3770                         l2cap_ertm_exit_local_busy(chan);
3771         }
3772 }
3773
3774 static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
3775 {
3776         struct sk_buff *skb;
3777         u32 control;
3778
3779         while ((skb = skb_peek(&chan->srej_q)) &&
3780                         !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3781                 int err;
3782
3783                 if (bt_cb(skb)->tx_seq != tx_seq)
3784                         break;
3785
3786                 skb = skb_dequeue(&chan->srej_q);
3787                 control = __set_ctrl_sar(chan, bt_cb(skb)->sar);
3788                 err = l2cap_reassemble_sdu(chan, skb, control);
3789
3790                 if (err < 0) {
3791                         l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3792                         break;
3793                 }
3794
3795                 chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
3796                 tx_seq = __next_seq(chan, tx_seq);
3797         }
3798 }
3799
3800 static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
3801 {
3802         struct srej_list *l, *tmp;
3803         u32 control;
3804
3805         list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
3806                 if (l->tx_seq == tx_seq) {
3807                         list_del(&l->list);
3808                         kfree(l);
3809                         return;
3810                 }
3811                 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
3812                 control |= __set_reqseq(chan, l->tx_seq);
3813                 l2cap_send_sframe(chan, control);
3814                 list_del(&l->list);
3815                 list_add_tail(&l->list, &chan->srej_l);
3816         }
3817 }
3818
3819 static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
3820 {
3821         struct srej_list *new;
3822         u32 control;
3823
3824         while (tx_seq != chan->expected_tx_seq) {
3825                 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
3826                 control |= __set_reqseq(chan, chan->expected_tx_seq);
3827                 l2cap_send_sframe(chan, control);
3828
3829                 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3830                 if (!new)
3831                         return -ENOMEM;
3832
3833                 new->tx_seq = chan->expected_tx_seq;
3834
3835                 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3836
3837                 list_add_tail(&new->list, &chan->srej_l);
3838         }
3839
3840         chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3841
3842         return 0;
3843 }
3844
3845 static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
3846 {
3847         u16 tx_seq = __get_txseq(chan, rx_control);
3848         u16 req_seq = __get_reqseq(chan, rx_control);
3849         u8 sar = __get_ctrl_sar(chan, rx_control);
3850         int tx_seq_offset, expected_tx_seq_offset;
3851         int num_to_ack = (chan->tx_win/6) + 1;
3852         int err = 0;
3853
3854         BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
3855                                                         tx_seq, rx_control);
3856
3857         if (__is_ctrl_final(chan, rx_control) &&
3858                         test_bit(CONN_WAIT_F, &chan->conn_state)) {
3859                 __clear_monitor_timer(chan);
3860                 if (chan->unacked_frames > 0)
3861                         __set_retrans_timer(chan);
3862                 clear_bit(CONN_WAIT_F, &chan->conn_state);
3863         }
3864
3865         chan->expected_ack_seq = req_seq;
3866         l2cap_drop_acked_frames(chan);
3867
3868         tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
3869
3870         /* invalid tx_seq */
3871         if (tx_seq_offset >= chan->tx_win) {
3872                 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3873                 goto drop;
3874         }
3875
3876         if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3877                 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
3878                         l2cap_send_ack(chan);
3879                 goto drop;
3880         }
3881
3882         if (tx_seq == chan->expected_tx_seq)
3883                 goto expected;
3884
3885         if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3886                 struct srej_list *first;
3887
3888                 first = list_first_entry(&chan->srej_l,
3889                                 struct srej_list, list);
3890                 if (tx_seq == first->tx_seq) {
3891                         l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
3892                         l2cap_check_srej_gap(chan, tx_seq);
3893
3894                         list_del(&first->list);
3895                         kfree(first);
3896
3897                         if (list_empty(&chan->srej_l)) {
3898                                 chan->buffer_seq = chan->buffer_seq_srej;
3899                                 clear_bit(CONN_SREJ_SENT, &chan->conn_state);
3900                                 l2cap_send_ack(chan);
3901                                 BT_DBG("chan %p, Exit SREJ_SENT", chan);
3902                         }
3903                 } else {
3904                         struct srej_list *l;
3905
3906                         /* duplicated tx_seq */
3907                         if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
3908                                 goto drop;
3909
3910                         list_for_each_entry(l, &chan->srej_l, list) {
3911                                 if (l->tx_seq == tx_seq) {
3912                                         l2cap_resend_srejframe(chan, tx_seq);
3913                                         return 0;
3914                                 }
3915                         }
3916
3917                         err = l2cap_send_srejframe(chan, tx_seq);
3918                         if (err < 0) {
3919                                 l2cap_send_disconn_req(chan->conn, chan, -err);
3920                                 return err;
3921                         }
3922                 }
3923         } else {
3924                 expected_tx_seq_offset = __seq_offset(chan,
3925                                 chan->expected_tx_seq, chan->buffer_seq);
3926
3927                 /* duplicated tx_seq */
3928                 if (tx_seq_offset < expected_tx_seq_offset)
3929                         goto drop;
3930
3931                 set_bit(CONN_SREJ_SENT, &chan->conn_state);
3932
3933                 BT_DBG("chan %p, Enter SREJ", chan);
3934
3935                 INIT_LIST_HEAD(&chan->srej_l);
3936                 chan->buffer_seq_srej = chan->buffer_seq;
3937
3938                 __skb_queue_head_init(&chan->srej_q);
3939                 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
3940
3941                 /* Set P-bit only if there are some I-frames to ack. */
3942                 if (__clear_ack_timer(chan))
3943                         set_bit(CONN_SEND_PBIT, &chan->conn_state);
3944
3945                 err = l2cap_send_srejframe(chan, tx_seq);
3946                 if (err < 0) {
3947                         l2cap_send_disconn_req(chan->conn, chan, -err);
3948                         return err;
3949                 }
3950         }
3951         return 0;
3952
3953 expected:
3954         chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3955
3956         if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3957                 bt_cb(skb)->tx_seq = tx_seq;
3958                 bt_cb(skb)->sar = sar;
3959                 __skb_queue_tail(&chan->srej_q, skb);
3960                 return 0;
3961         }
3962
3963         err = l2cap_reassemble_sdu(chan, skb, rx_control);
3964         chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
3965
3966         if (err < 0) {
3967                 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3968                 return err;
3969         }
3970
3971         if (__is_ctrl_final(chan, rx_control)) {
3972                 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
3973                         l2cap_retransmit_frames(chan);
3974         }
3975
3976
3977         chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3978         if (chan->num_acked == num_to_ack - 1)
3979                 l2cap_send_ack(chan);
3980         else
3981                 __set_ack_timer(chan);
3982
3983         return 0;
3984
3985 drop:
3986         kfree_skb(skb);
3987         return 0;
3988 }
3989
3990 static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
3991 {
3992         BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
3993                                 __get_reqseq(chan, rx_control), rx_control);
3994
3995         chan->expected_ack_seq = __get_reqseq(chan, rx_control);
3996         l2cap_drop_acked_frames(chan);
3997
3998         if (__is_ctrl_poll(chan, rx_control)) {
3999                 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4000                 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
4001                         if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
4002                                         (chan->unacked_frames > 0))
4003                                 __set_retrans_timer(chan);
4004
4005                         clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4006                         l2cap_send_srejtail(chan);
4007                 } else {
4008                         l2cap_send_i_or_rr_or_rnr(chan);
4009                 }
4010
4011         } else if (__is_ctrl_final(chan, rx_control)) {
4012                 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4013
4014                 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
4015                         l2cap_retransmit_frames(chan);
4016
4017         } else {
4018                 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
4019                                 (chan->unacked_frames > 0))
4020                         __set_retrans_timer(chan);
4021
4022                 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4023                 if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
4024                         l2cap_send_ack(chan);
4025                 else
4026                         l2cap_ertm_send(chan);
4027         }
4028 }
4029
4030 static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
4031 {
4032         u16 tx_seq = __get_reqseq(chan, rx_control);
4033
4034         BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
4035
4036         clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4037
4038         chan->expected_ack_seq = tx_seq;
4039         l2cap_drop_acked_frames(chan);
4040
4041         if (__is_ctrl_final(chan, rx_control)) {
4042                 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
4043                         l2cap_retransmit_frames(chan);
4044         } else {
4045                 l2cap_retransmit_frames(chan);
4046
4047                 if (test_bit(CONN_WAIT_F, &chan->conn_state))
4048                         set_bit(CONN_REJ_ACT, &chan->conn_state);
4049         }
4050 }
4051 static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
4052 {
4053         u16 tx_seq = __get_reqseq(chan, rx_control);
4054
4055         BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
4056
4057         clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4058
4059         if (__is_ctrl_poll(chan, rx_control)) {
4060                 chan->expected_ack_seq = tx_seq;
4061                 l2cap_drop_acked_frames(chan);
4062
4063                 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4064                 l2cap_retransmit_one_frame(chan, tx_seq);
4065
4066                 l2cap_ertm_send(chan);
4067
4068                 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
4069                         chan->srej_save_reqseq = tx_seq;
4070                         set_bit(CONN_SREJ_ACT, &chan->conn_state);
4071                 }
4072         } else if (__is_ctrl_final(chan, rx_control)) {
4073                 if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
4074                                 chan->srej_save_reqseq == tx_seq)
4075                         clear_bit(CONN_SREJ_ACT, &chan->conn_state);
4076                 else
4077                         l2cap_retransmit_one_frame(chan, tx_seq);
4078         } else {
4079                 l2cap_retransmit_one_frame(chan, tx_seq);
4080                 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
4081                         chan->srej_save_reqseq = tx_seq;
4082                         set_bit(CONN_SREJ_ACT, &chan->conn_state);
4083                 }
4084         }
4085 }
4086
4087 static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
4088 {
4089         u16 tx_seq = __get_reqseq(chan, rx_control);
4090
4091         BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
4092
4093         set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4094         chan->expected_ack_seq = tx_seq;
4095         l2cap_drop_acked_frames(chan);
4096
4097         if (__is_ctrl_poll(chan, rx_control))
4098                 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4099
4100         if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
4101                 __clear_retrans_timer(chan);
4102                 if (__is_ctrl_poll(chan, rx_control))
4103                         l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
4104                 return;
4105         }
4106
4107         if (__is_ctrl_poll(chan, rx_control)) {
4108                 l2cap_send_srejtail(chan);
4109         } else {
4110                 rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
4111                 l2cap_send_sframe(chan, rx_control);
4112         }
4113 }
4114
4115 static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
4116 {
4117         BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
4118
4119         if (__is_ctrl_final(chan, rx_control) &&
4120                         test_bit(CONN_WAIT_F, &chan->conn_state)) {
4121                 __clear_monitor_timer(chan);
4122                 if (chan->unacked_frames > 0)
4123                         __set_retrans_timer(chan);
4124                 clear_bit(CONN_WAIT_F, &chan->conn_state);
4125         }
4126
4127         switch (__get_ctrl_super(chan, rx_control)) {
4128         case L2CAP_SUPER_RR:
4129                 l2cap_data_channel_rrframe(chan, rx_control);
4130                 break;
4131
4132         case L2CAP_SUPER_REJ:
4133                 l2cap_data_channel_rejframe(chan, rx_control);
4134                 break;
4135
4136         case L2CAP_SUPER_SREJ:
4137                 l2cap_data_channel_srejframe(chan, rx_control);
4138                 break;
4139
4140         case L2CAP_SUPER_RNR:
4141                 l2cap_data_channel_rnrframe(chan, rx_control);
4142                 break;
4143         }
4144
4145         kfree_skb(skb);
4146         return 0;
4147 }
4148
4149 static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
4150 {
4151         u32 control;
4152         u16 req_seq;
4153         int len, next_tx_seq_offset, req_seq_offset;
4154
4155         control = __get_control(chan, skb->data);
4156         skb_pull(skb, __ctrl_size(chan));
4157         len = skb->len;
4158
4159         /*
4160          * We can just drop the corrupted I-frame here.
4161          * Receiver will miss it and start proper recovery
4162          * procedures and ask retransmission.
4163          */
4164         if (l2cap_check_fcs(chan, skb))
4165                 goto drop;
4166
4167         if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
4168                 len -= L2CAP_SDULEN_SIZE;
4169
4170         if (chan->fcs == L2CAP_FCS_CRC16)
4171                 len -= L2CAP_FCS_SIZE;
4172
4173         if (len > chan->mps) {
4174                 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4175                 goto drop;
4176         }
4177
4178         req_seq = __get_reqseq(chan, control);
4179
4180         req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
4181
4182         next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
4183                                                 chan->expected_ack_seq);
4184
4185         /* check for invalid req-seq */
4186         if (req_seq_offset > next_tx_seq_offset) {
4187                 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4188                 goto drop;
4189         }
4190
4191         if (!__is_sframe(chan, control)) {
4192                 if (len < 0) {
4193                         l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4194                         goto drop;
4195                 }
4196
4197                 l2cap_data_channel_iframe(chan, control, skb);
4198         } else {
4199                 if (len != 0) {
4200                         BT_ERR("%d", len);
4201                         l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4202                         goto drop;
4203                 }
4204
4205                 l2cap_data_channel_sframe(chan, control, skb);
4206         }
4207
4208         return 0;
4209
4210 drop:
4211         kfree_skb(skb);
4212         return 0;
4213 }
4214
4215 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4216 {
4217         struct l2cap_chan *chan;
4218         struct sock *sk = NULL;
4219         u32 control;
4220         u16 tx_seq;
4221         int len;
4222
4223         chan = l2cap_get_chan_by_scid(conn, cid);
4224         if (!chan) {
4225                 BT_DBG("unknown cid 0x%4.4x", cid);
4226                 goto drop;
4227         }
4228
4229         sk = chan->sk;
4230
4231         BT_DBG("chan %p, len %d", chan, skb->len);
4232
4233         if (chan->state != BT_CONNECTED)
4234                 goto drop;
4235
4236         switch (chan->mode) {
4237         case L2CAP_MODE_BASIC:
4238                 /* If socket recv buffers overflows we drop data here
4239                  * which is *bad* because L2CAP has to be reliable.
4240                  * But we don't have any other choice. L2CAP doesn't
4241                  * provide flow control mechanism. */
4242
4243                 if (chan->imtu < skb->len)
4244                         goto drop;
4245
4246                 if (!chan->ops->recv(chan->data, skb))
4247                         goto done;
4248                 break;
4249
4250         case L2CAP_MODE_ERTM:
4251                 l2cap_ertm_data_rcv(chan, skb);
4252
4253                 goto done;
4254
4255         case L2CAP_MODE_STREAMING:
4256                 control = __get_control(chan, skb->data);
4257                 skb_pull(skb, __ctrl_size(chan));
4258                 len = skb->len;
4259
4260                 if (l2cap_check_fcs(chan, skb))
4261                         goto drop;
4262
4263                 if (__is_sar_start(chan, control))
4264                         len -= L2CAP_SDULEN_SIZE;
4265
4266                 if (chan->fcs == L2CAP_FCS_CRC16)
4267                         len -= L2CAP_FCS_SIZE;
4268
4269                 if (len > chan->mps || len < 0 || __is_sframe(chan, control))
4270                         goto drop;
4271
4272                 tx_seq = __get_txseq(chan, control);
4273
4274                 if (chan->expected_tx_seq != tx_seq) {
4275                         /* Frame(s) missing - must discard partial SDU */
4276                         kfree_skb(chan->sdu);
4277                         chan->sdu = NULL;
4278                         chan->sdu_last_frag = NULL;
4279                         chan->sdu_len = 0;
4280
4281                         /* TODO: Notify userland of missing data */
4282                 }
4283
4284                 chan->expected_tx_seq = __next_seq(chan, tx_seq);
4285
4286                 if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
4287                         l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4288
4289                 goto done;
4290
4291         default:
4292                 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
4293                 break;
4294         }
4295
4296 drop:
4297         kfree_skb(skb);
4298
4299 done:
4300         if (sk)
4301                 release_sock(sk);
4302
4303         return 0;
4304 }
4305
4306 static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
4307 {
4308         struct sock *sk = NULL;
4309         struct l2cap_chan *chan;
4310
4311         chan = l2cap_global_chan_by_psm(0, psm, conn->src);
4312         if (!chan)
4313                 goto drop;
4314
4315         sk = chan->sk;
4316
4317         lock_sock(sk);
4318
4319         BT_DBG("sk %p, len %d", sk, skb->len);
4320
4321         if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
4322                 goto drop;
4323
4324         if (chan->imtu < skb->len)
4325                 goto drop;
4326
4327         if (!chan->ops->recv(chan->data, skb))
4328                 goto done;
4329
4330 drop:
4331         kfree_skb(skb);
4332
4333 done:
4334         if (sk)
4335                 release_sock(sk);
4336         return 0;
4337 }
4338
4339 static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
4340 {
4341         struct sock *sk = NULL;
4342         struct l2cap_chan *chan;
4343
4344         chan = l2cap_global_chan_by_scid(0, cid, conn->src);
4345         if (!chan)
4346                 goto drop;
4347
4348         sk = chan->sk;
4349
4350         lock_sock(sk);
4351
4352         BT_DBG("sk %p, len %d", sk, skb->len);
4353
4354         if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
4355                 goto drop;
4356
4357         if (chan->imtu < skb->len)
4358                 goto drop;
4359
4360         if (!chan->ops->recv(chan->data, skb))
4361                 goto done;
4362
4363 drop:
4364         kfree_skb(skb);
4365
4366 done:
4367         if (sk)
4368                 release_sock(sk);
4369         return 0;
4370 }
4371
4372 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4373 {
4374         struct l2cap_hdr *lh = (void *) skb->data;
4375         u16 cid, len;
4376         __le16 psm;
4377
4378         skb_pull(skb, L2CAP_HDR_SIZE);
4379         cid = __le16_to_cpu(lh->cid);
4380         len = __le16_to_cpu(lh->len);
4381
4382         if (len != skb->len) {
4383                 kfree_skb(skb);
4384                 return;
4385         }
4386
4387         BT_DBG("len %d, cid 0x%4.4x", len, cid);
4388
4389         switch (cid) {
4390         case L2CAP_CID_LE_SIGNALING:
4391         case L2CAP_CID_SIGNALING:
4392                 l2cap_sig_channel(conn, skb);
4393                 break;
4394
4395         case L2CAP_CID_CONN_LESS:
4396                 psm = get_unaligned_le16(skb->data);
4397                 skb_pull(skb, 2);
4398                 l2cap_conless_channel(conn, psm, skb);
4399                 break;
4400
4401         case L2CAP_CID_LE_DATA:
4402                 l2cap_att_channel(conn, cid, skb);
4403                 break;
4404
4405         case L2CAP_CID_SMP:
4406                 if (smp_sig_channel(conn, skb))
4407                         l2cap_conn_del(conn->hcon, EACCES);
4408                 break;
4409
4410         default:
4411                 l2cap_data_channel(conn, cid, skb);
4412                 break;
4413         }
4414 }
4415
4416 /* ---- L2CAP interface with lower layer (HCI) ---- */
4417
4418 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
4419 {
4420         int exact = 0, lm1 = 0, lm2 = 0;
4421         struct l2cap_chan *c;
4422
4423         BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4424
4425         /* Find listening sockets and check their link_mode */
4426         read_lock(&chan_list_lock);
4427         list_for_each_entry(c, &chan_list, global_l) {
4428                 struct sock *sk = c->sk;
4429
4430                 if (c->state != BT_LISTEN)
4431                         continue;
4432
4433                 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
4434                         lm1 |= HCI_LM_ACCEPT;
4435                         if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
4436                                 lm1 |= HCI_LM_MASTER;
4437                         exact++;
4438                 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4439                         lm2 |= HCI_LM_ACCEPT;
4440                         if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
4441                                 lm2 |= HCI_LM_MASTER;
4442                 }
4443         }
4444         read_unlock(&chan_list_lock);
4445
4446         return exact ? lm1 : lm2;
4447 }
4448
4449 int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4450 {
4451         struct l2cap_conn *conn;
4452
4453         BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4454
4455         if (!status) {
4456                 conn = l2cap_conn_add(hcon, status);
4457                 if (conn)
4458                         l2cap_conn_ready(conn);
4459         } else
4460                 l2cap_conn_del(hcon, bt_to_errno(status));
4461
4462         return 0;
4463 }
4464
4465 int l2cap_disconn_ind(struct hci_conn *hcon)
4466 {
4467         struct l2cap_conn *conn = hcon->l2cap_data;
4468
4469         BT_DBG("hcon %p", hcon);
4470
4471         if (!conn)
4472                 return HCI_ERROR_REMOTE_USER_TERM;
4473         return conn->disc_reason;
4474 }
4475
4476 int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
4477 {
4478         BT_DBG("hcon %p reason %d", hcon, reason);
4479
4480         l2cap_conn_del(hcon, bt_to_errno(reason));
4481         return 0;
4482 }
4483
4484 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
4485 {
4486         if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
4487                 return;
4488
4489         if (encrypt == 0x00) {
4490                 if (chan->sec_level == BT_SECURITY_MEDIUM) {
4491                         __clear_chan_timer(chan);
4492                         __set_chan_timer(chan,
4493                                         msecs_to_jiffies(L2CAP_ENC_TIMEOUT));
4494                 } else if (chan->sec_level == BT_SECURITY_HIGH)
4495                         l2cap_chan_close(chan, ECONNREFUSED);
4496         } else {
4497                 if (chan->sec_level == BT_SECURITY_MEDIUM)
4498                         __clear_chan_timer(chan);
4499         }
4500 }
4501
4502 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
4503 {
4504         struct l2cap_conn *conn = hcon->l2cap_data;
4505         struct l2cap_chan *chan;
4506
4507         if (!conn)
4508                 return 0;
4509
4510         BT_DBG("conn %p", conn);
4511
4512         if (hcon->type == LE_LINK) {
4513                 smp_distribute_keys(conn, 0);
4514                 cancel_delayed_work(&conn->security_timer);
4515         }
4516
4517         rcu_read_lock();
4518
4519         list_for_each_entry_rcu(chan, &conn->chan_l, list) {
4520                 struct sock *sk = chan->sk;
4521
4522                 bh_lock_sock(sk);
4523
4524                 BT_DBG("chan->scid %d", chan->scid);
4525
4526                 if (chan->scid == L2CAP_CID_LE_DATA) {
4527                         if (!status && encrypt) {
4528                                 chan->sec_level = hcon->sec_level;
4529                                 l2cap_chan_ready(chan);
4530                         }
4531
4532                         bh_unlock_sock(sk);
4533                         continue;
4534                 }
4535
4536                 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
4537                         bh_unlock_sock(sk);
4538                         continue;
4539                 }
4540
4541                 if (!status && (chan->state == BT_CONNECTED ||
4542                                                 chan->state == BT_CONFIG)) {
4543                         l2cap_check_encryption(chan, encrypt);
4544                         bh_unlock_sock(sk);
4545                         continue;
4546                 }
4547
4548                 if (chan->state == BT_CONNECT) {
4549                         if (!status) {
4550                                 struct l2cap_conn_req req;
4551                                 req.scid = cpu_to_le16(chan->scid);
4552                                 req.psm  = chan->psm;
4553
4554                                 chan->ident = l2cap_get_ident(conn);
4555                                 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
4556
4557                                 l2cap_send_cmd(conn, chan->ident,
4558                                         L2CAP_CONN_REQ, sizeof(req), &req);
4559                         } else {
4560                                 __clear_chan_timer(chan);
4561                                 __set_chan_timer(chan,
4562                                         msecs_to_jiffies(L2CAP_DISC_TIMEOUT));
4563                         }
4564                 } else if (chan->state == BT_CONNECT2) {
4565                         struct l2cap_conn_rsp rsp;
4566                         __u16 res, stat;
4567
4568                         if (!status) {
4569                                 if (bt_sk(sk)->defer_setup) {
4570                                         struct sock *parent = bt_sk(sk)->parent;
4571                                         res = L2CAP_CR_PEND;
4572                                         stat = L2CAP_CS_AUTHOR_PEND;
4573                                         if (parent)
4574                                                 parent->sk_data_ready(parent, 0);
4575                                 } else {
4576                                         l2cap_state_change(chan, BT_CONFIG);
4577                                         res = L2CAP_CR_SUCCESS;
4578                                         stat = L2CAP_CS_NO_INFO;
4579                                 }
4580                         } else {
4581                                 l2cap_state_change(chan, BT_DISCONN);
4582                                 __set_chan_timer(chan,
4583                                         msecs_to_jiffies(L2CAP_DISC_TIMEOUT));
4584                                 res = L2CAP_CR_SEC_BLOCK;
4585                                 stat = L2CAP_CS_NO_INFO;
4586                         }
4587
4588                         rsp.scid   = cpu_to_le16(chan->dcid);
4589                         rsp.dcid   = cpu_to_le16(chan->scid);
4590                         rsp.result = cpu_to_le16(res);
4591                         rsp.status = cpu_to_le16(stat);
4592                         l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4593                                                         sizeof(rsp), &rsp);
4594                 }
4595
4596                 bh_unlock_sock(sk);
4597         }
4598
4599         rcu_read_unlock();
4600
4601         return 0;
4602 }
4603
4604 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4605 {
4606         struct l2cap_conn *conn = hcon->l2cap_data;
4607
4608         if (!conn)
4609                 conn = l2cap_conn_add(hcon, 0);
4610
4611         if (!conn)
4612                 goto drop;
4613
4614         BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4615
4616         if (!(flags & ACL_CONT)) {
4617                 struct l2cap_hdr *hdr;
4618                 struct l2cap_chan *chan;
4619                 u16 cid;
4620                 int len;
4621
4622                 if (conn->rx_len) {
4623                         BT_ERR("Unexpected start frame (len %d)", skb->len);
4624                         kfree_skb(conn->rx_skb);
4625                         conn->rx_skb = NULL;
4626                         conn->rx_len = 0;
4627                         l2cap_conn_unreliable(conn, ECOMM);
4628                 }
4629
4630                 /* Start fragment always begin with Basic L2CAP header */
4631                 if (skb->len < L2CAP_HDR_SIZE) {
4632                         BT_ERR("Frame is too short (len %d)", skb->len);
4633                         l2cap_conn_unreliable(conn, ECOMM);
4634                         goto drop;
4635                 }
4636
4637                 hdr = (struct l2cap_hdr *) skb->data;
4638                 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4639                 cid = __le16_to_cpu(hdr->cid);
4640
4641                 if (len == skb->len) {
4642                         /* Complete frame received */
4643                         l2cap_recv_frame(conn, skb);
4644                         return 0;
4645                 }
4646
4647                 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4648
4649                 if (skb->len > len) {
4650                         BT_ERR("Frame is too long (len %d, expected len %d)",
4651                                 skb->len, len);
4652                         l2cap_conn_unreliable(conn, ECOMM);
4653                         goto drop;
4654                 }
4655
4656                 chan = l2cap_get_chan_by_scid(conn, cid);
4657
4658                 if (chan && chan->sk) {
4659                         struct sock *sk = chan->sk;
4660
4661                         if (chan->imtu < len - L2CAP_HDR_SIZE) {
4662                                 BT_ERR("Frame exceeding recv MTU (len %d, "
4663                                                         "MTU %d)", len,
4664                                                         chan->imtu);
4665                                 release_sock(sk);
4666                                 l2cap_conn_unreliable(conn, ECOMM);
4667                                 goto drop;
4668                         }
4669                         release_sock(sk);
4670                 }
4671
4672                 /* Allocate skb for the complete frame (with header) */
4673                 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4674                 if (!conn->rx_skb)
4675                         goto drop;
4676
4677                 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4678                                                                 skb->len);
4679                 conn->rx_len = len - skb->len;
4680         } else {
4681                 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4682
4683                 if (!conn->rx_len) {
4684                         BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4685                         l2cap_conn_unreliable(conn, ECOMM);
4686                         goto drop;
4687                 }
4688
4689                 if (skb->len > conn->rx_len) {
4690                         BT_ERR("Fragment is too long (len %d, expected %d)",
4691                                         skb->len, conn->rx_len);
4692                         kfree_skb(conn->rx_skb);
4693                         conn->rx_skb = NULL;
4694                         conn->rx_len = 0;
4695                         l2cap_conn_unreliable(conn, ECOMM);
4696                         goto drop;
4697                 }
4698
4699                 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4700                                                                 skb->len);
4701                 conn->rx_len -= skb->len;
4702
4703                 if (!conn->rx_len) {
4704                         /* Complete frame received */
4705                         l2cap_recv_frame(conn, conn->rx_skb);
4706                         conn->rx_skb = NULL;
4707                 }
4708         }
4709
4710 drop:
4711         kfree_skb(skb);
4712         return 0;
4713 }
4714
4715 static int l2cap_debugfs_show(struct seq_file *f, void *p)
4716 {
4717         struct l2cap_chan *c;
4718
4719         read_lock(&chan_list_lock);
4720
4721         list_for_each_entry(c, &chan_list, global_l) {
4722                 struct sock *sk = c->sk;
4723
4724                 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
4725                                         batostr(&bt_sk(sk)->src),
4726                                         batostr(&bt_sk(sk)->dst),
4727                                         c->state, __le16_to_cpu(c->psm),
4728                                         c->scid, c->dcid, c->imtu, c->omtu,
4729                                         c->sec_level, c->mode);
4730         }
4731
4732         read_unlock(&chan_list_lock);
4733
4734         return 0;
4735 }
4736
4737 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4738 {
4739         return single_open(file, l2cap_debugfs_show, inode->i_private);
4740 }
4741
4742 static const struct file_operations l2cap_debugfs_fops = {
4743         .open           = l2cap_debugfs_open,
4744         .read           = seq_read,
4745         .llseek         = seq_lseek,
4746         .release        = single_release,
4747 };
4748
4749 static struct dentry *l2cap_debugfs;
4750
4751 int __init l2cap_init(void)
4752 {
4753         int err;
4754
4755         err = l2cap_init_sockets();
4756         if (err < 0)
4757                 return err;
4758
4759         if (bt_debugfs) {
4760                 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4761                                         bt_debugfs, NULL, &l2cap_debugfs_fops);
4762                 if (!l2cap_debugfs)
4763                         BT_ERR("Failed to create L2CAP debug file");
4764         }
4765
4766         return 0;
4767 }
4768
4769 void l2cap_exit(void)
4770 {
4771         debugfs_remove(l2cap_debugfs);
4772         l2cap_cleanup_sockets();
4773 }
4774
4775 module_param(disable_ertm, bool, 0644);
4776 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");