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