net/bluetooth/bnep/core.c

   1 /*
   2    BNEP implementation for Linux Bluetooth stack (BlueZ).
   3    Copyright (C) 2001-2002 Inventel Systemes
   4    Written 2001-2002 by
   5         Clément Moreau <clement.moreau@inventel.fr>
   6         David Libault  <david.libault@inventel.fr>
   7
   8    Copyright (C) 2002 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 #include <linux/module.h>
  29 #include <linux/kthread.h>
  30 #include <linux/file.h>
  31 #include <linux/etherdevice.h>
  32 #include <asm/unaligned.h>
  33
  34 #include <net/bluetooth/bluetooth.h>
  35 #include <net/bluetooth/l2cap.h>
  36 #include <net/bluetooth/hci_core.h>
  37
  38 #include "bnep.h"
  39
  40 #define VERSION "1.3"
  41
  42 static bool compress_src = true;
  43 static bool compress_dst = true;
  44
  45 static LIST_HEAD(bnep_session_list);
  46 static DECLARE_RWSEM(bnep_session_sem);
  47
  48 static struct bnep_session *__bnep_get_session(u8 *dst)
  49 {
  50         struct bnep_session *s;
  51
  52         BT_DBG("");
  53
  54         list_for_each_entry(s, &bnep_session_list, list)
  55                 if (ether_addr_equal(dst, s->eh.h_source))
  56                         return s;
  57
  58         return NULL;
  59 }
  60
  61 static void __bnep_link_session(struct bnep_session *s)
  62 {
  63         list_add(&s->list, &bnep_session_list);
  64 }
  65
  66 static void __bnep_unlink_session(struct bnep_session *s)
  67 {
  68         list_del(&s->list);
  69 }
  70
  71 static int bnep_send(struct bnep_session *s, void *data, size_t len)
  72 {
  73         struct socket *sock = s->sock;
  74         struct kvec iv = { data, len };
  75
  76         return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
  77 }
  78
  79 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
  80 {
  81         struct bnep_control_rsp rsp;
  82         rsp.type = BNEP_CONTROL;
  83         rsp.ctrl = ctrl;
  84         rsp.resp = htons(resp);
  85         return bnep_send(s, &rsp, sizeof(rsp));
  86 }
  87
  88 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
  89 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
  90 {
  91         /* (IPv4, ARP)  */
  92         s->proto_filter[0].start = ETH_P_IP;
  93         s->proto_filter[0].end   = ETH_P_ARP;
  94         /* (RARP, AppleTalk) */
  95         s->proto_filter[1].start = ETH_P_RARP;
  96         s->proto_filter[1].end   = ETH_P_AARP;
  97         /* (IPX, IPv6) */
  98         s->proto_filter[2].start = ETH_P_IPX;
  99         s->proto_filter[2].end   = ETH_P_IPV6;
 100 }
 101 #endif
 102
 103 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
 104 {
 105         int n;
 106
 107         if (len < 2)
 108                 return -EILSEQ;
 109
 110         n = get_unaligned_be16(data);
 111         data++;
 112         len -= 2;
 113
 114         if (len < n)
 115                 return -EILSEQ;
 116
 117         BT_DBG("filter len %d", n);
 118
 119 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 120         n /= 4;
 121         if (n <= BNEP_MAX_PROTO_FILTERS) {
 122                 struct bnep_proto_filter *f = s->proto_filter;
 123                 int i;
 124
 125                 for (i = 0; i < n; i++) {
 126                         f[i].start = get_unaligned_be16(data++);
 127                         f[i].end   = get_unaligned_be16(data++);
 128
 129                         BT_DBG("proto filter start %d end %d",
 130                                 f[i].start, f[i].end);
 131                 }
 132
 133                 if (i < BNEP_MAX_PROTO_FILTERS)
 134                         memset(f + i, 0, sizeof(*f));
 135
 136                 if (n == 0)
 137                         bnep_set_default_proto_filter(s);
 138
 139                 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
 140         } else {
 141                 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
 142         }
 143 #else
 144         bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
 145 #endif
 146         return 0;
 147 }
 148
 149 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
 150 {
 151         int n;
 152
 153         if (len < 2)
 154                 return -EILSEQ;
 155
 156         n = get_unaligned_be16(data);
 157         data += 2;
 158         len -= 2;
 159
 160         if (len < n)
 161                 return -EILSEQ;
 162
 163         BT_DBG("filter len %d", n);
 164
 165 #ifdef CONFIG_BT_BNEP_MC_FILTER
 166         n /= (ETH_ALEN * 2);
 167
 168         if (n > 0) {
 169                 int i;
 170
 171                 s->mc_filter = 0;
 172
 173                 /* Always send broadcast */
 174                 set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
 175
 176                 /* Add address ranges to the multicast hash */
 177                 for (; n > 0; n--) {
 178                         u8 a1[6], *a2;
 179
 180                         memcpy(a1, data, ETH_ALEN);
 181                         data += ETH_ALEN;
 182                         a2 = data;
 183                         data += ETH_ALEN;
 184
 185                         BT_DBG("mc filter %pMR -> %pMR", a1, a2);
 186
 187                         /* Iterate from a1 to a2 */
 188                         set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
 189                         while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
 190                                 /* Increment a1 */
 191                                 i = 5;
 192                                 while (i >= 0 && ++a1[i--] == 0)
 193                                         ;
 194
 195                                 set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
 196                         }
 197                 }
 198         }
 199
 200         BT_DBG("mc filter hash 0x%llx", s->mc_filter);
 201
 202         bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
 203 #else
 204         bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
 205 #endif
 206         return 0;
 207 }
 208
 209 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
 210 {
 211         u8  cmd = *(u8 *)data;
 212         int err = 0;
 213
 214         data++;
 215         len--;
 216
 217         switch (cmd) {
 218         case BNEP_CMD_NOT_UNDERSTOOD:
 219         case BNEP_SETUP_CONN_RSP:
 220         case BNEP_FILTER_NET_TYPE_RSP:
 221         case BNEP_FILTER_MULTI_ADDR_RSP:
 222                 /* Ignore these for now */
 223                 break;
 224
 225         case BNEP_FILTER_NET_TYPE_SET:
 226                 err = bnep_ctrl_set_netfilter(s, data, len);
 227                 break;
 228
 229         case BNEP_FILTER_MULTI_ADDR_SET:
 230                 err = bnep_ctrl_set_mcfilter(s, data, len);
 231                 break;
 232
 233         case BNEP_SETUP_CONN_REQ:
 234                 /* Successful response should be sent only once */
 235                 if (test_bit(BNEP_SETUP_RESPONSE, &s->flags) &&
 236                     !test_and_set_bit(BNEP_SETUP_RSP_SENT, &s->flags))
 237                         err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP,
 238                                             BNEP_SUCCESS);
 239                 else
 240                         err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP,
 241                                             BNEP_CONN_NOT_ALLOWED);
 242                 break;
 243
 244         default: {
 245                         u8 pkt[3];
 246                         pkt[0] = BNEP_CONTROL;
 247                         pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
 248                         pkt[2] = cmd;
 249                         err = bnep_send(s, pkt, sizeof(pkt));
 250                 }
 251                 break;
 252         }
 253
 254         return err;
 255 }
 256
 257 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
 258 {
 259         struct bnep_ext_hdr *h;
 260         int err = 0;
 261
 262         do {
 263                 h = (void *) skb->data;
 264                 if (!skb_pull(skb, sizeof(*h))) {
 265                         err = -EILSEQ;
 266                         break;
 267                 }
 268
 269                 BT_DBG("type 0x%x len %d", h->type, h->len);
 270
 271                 switch (h->type & BNEP_TYPE_MASK) {
 272                 case BNEP_EXT_CONTROL:
 273                         bnep_rx_control(s, skb->data, skb->len);
 274                         break;
 275
 276                 default:
 277                         /* Unknown extension, skip it. */
 278                         break;
 279                 }
 280
 281                 if (!skb_pull(skb, h->len)) {
 282                         err = -EILSEQ;
 283                         break;
 284                 }
 285         } while (!err && (h->type & BNEP_EXT_HEADER));
 286
 287         return err;
 288 }
 289
 290 static u8 __bnep_rx_hlen[] = {
 291         ETH_HLEN,     /* BNEP_GENERAL */
 292         0,            /* BNEP_CONTROL */
 293         2,            /* BNEP_COMPRESSED */
 294         ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
 295         ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
 296 };
 297
 298 static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
 299 {
 300         struct net_device *dev = s->dev;
 301         struct sk_buff *nskb;
 302         u8 type, ctrl_type;
 303
 304         dev->stats.rx_bytes += skb->len;
 305
 306         type = *(u8 *) skb->data;
 307         skb_pull(skb, 1);
 308         ctrl_type = *(u8 *)skb->data;
 309
 310         if ((type & BNEP_TYPE_MASK) >= sizeof(__bnep_rx_hlen))
 311                 goto badframe;
 312
 313         if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
 314                 if (bnep_rx_control(s, skb->data, skb->len) < 0) {
 315                         dev->stats.tx_errors++;
 316                         kfree_skb(skb);
 317                         return 0;
 318                 }
 319
 320                 if (!(type & BNEP_EXT_HEADER)) {
 321                         kfree_skb(skb);
 322                         return 0;
 323                 }
 324
 325                 /* Verify and pull ctrl message since it's already processed */
 326                 switch (ctrl_type) {
 327                 case BNEP_SETUP_CONN_REQ:
 328                         /* Pull: ctrl type (1 b), len (1 b), data (len bytes) */
 329                         if (!skb_pull(skb, 2 + *(u8 *)(skb->data + 1) * 2))
 330                                 goto badframe;
 331                         break;
 332                 case BNEP_FILTER_MULTI_ADDR_SET:
 333                 case BNEP_FILTER_NET_TYPE_SET:
 334                         /* Pull: ctrl type (1 b), len (2 b), data (len bytes) */
 335                         if (!skb_pull(skb, 3 + *(u16 *)(skb->data + 1) * 2))
 336                                 goto badframe;
 337                         break;
 338                 default:
 339                         kfree_skb(skb);
 340                         return 0;
 341                 }
 342         } else {
 343                 skb_reset_mac_header(skb);
 344
 345                 /* Verify and pull out header */
 346                 if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
 347                         goto badframe;
 348
 349                 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 350         }
 351
 352         if (type & BNEP_EXT_HEADER) {
 353                 if (bnep_rx_extension(s, skb) < 0)
 354                         goto badframe;
 355         }
 356
 357         /* Strip 802.1p header */
 358         if (ntohs(s->eh.h_proto) == ETH_P_8021Q) {
 359                 if (!skb_pull(skb, 4))
 360                         goto badframe;
 361                 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 362         }
 363
 364         /* We have to alloc new skb and copy data here :(. Because original skb
 365          * may not be modified and because of the alignment requirements. */
 366         nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
 367         if (!nskb) {
 368                 dev->stats.rx_dropped++;
 369                 kfree_skb(skb);
 370                 return -ENOMEM;
 371         }
 372         skb_reserve(nskb, 2);
 373
 374         /* Decompress header and construct ether frame */
 375         switch (type & BNEP_TYPE_MASK) {
 376         case BNEP_COMPRESSED:
 377                 memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
 378                 break;
 379
 380         case BNEP_COMPRESSED_SRC_ONLY:
 381                 memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
 382                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
 383                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 384                 break;
 385
 386         case BNEP_COMPRESSED_DST_ONLY:
 387                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
 388                                                                 ETH_ALEN);
 389                 memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
 390                                                                 ETH_ALEN + 2);
 391                 break;
 392
 393         case BNEP_GENERAL:
 394                 memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
 395                                                                 ETH_ALEN * 2);
 396                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 397                 break;
 398         }
 399
 400         skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
 401         kfree_skb(skb);
 402
 403         dev->stats.rx_packets++;
 404         nskb->ip_summed = CHECKSUM_NONE;
 405         nskb->protocol  = eth_type_trans(nskb, dev);
 406         netif_rx_ni(nskb);
 407         return 0;
 408
 409 badframe:
 410         dev->stats.rx_errors++;
 411         kfree_skb(skb);
 412         return 0;
 413 }
 414
 415 static u8 __bnep_tx_types[] = {
 416         BNEP_GENERAL,
 417         BNEP_COMPRESSED_SRC_ONLY,
 418         BNEP_COMPRESSED_DST_ONLY,
 419         BNEP_COMPRESSED
 420 };
 421
 422 static int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
 423 {
 424         struct ethhdr *eh = (void *) skb->data;
 425         struct socket *sock = s->sock;
 426         struct kvec iv[3];
 427         int len = 0, il = 0;
 428         u8 type = 0;
 429
 430         BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
 431
 432         if (!skb->dev) {
 433                 /* Control frame sent by us */
 434                 goto send;
 435         }
 436
 437         iv[il++] = (struct kvec) { &type, 1 };
 438         len++;
 439
 440         if (compress_src && ether_addr_equal(eh->h_dest, s->eh.h_source))
 441                 type |= 0x01;
 442
 443         if (compress_dst && ether_addr_equal(eh->h_source, s->eh.h_dest))
 444                 type |= 0x02;
 445
 446         if (type)
 447                 skb_pull(skb, ETH_ALEN * 2);
 448
 449         type = __bnep_tx_types[type];
 450         switch (type) {
 451         case BNEP_COMPRESSED_SRC_ONLY:
 452                 iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
 453                 len += ETH_ALEN;
 454                 break;
 455
 456         case BNEP_COMPRESSED_DST_ONLY:
 457                 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
 458                 len += ETH_ALEN;
 459                 break;
 460         }
 461
 462 send:
 463         iv[il++] = (struct kvec) { skb->data, skb->len };
 464         len += skb->len;
 465
 466         /* FIXME: linearize skb */
 467         {
 468                 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
 469         }
 470         kfree_skb(skb);
 471
 472         if (len > 0) {
 473                 s->dev->stats.tx_bytes += len;
 474                 s->dev->stats.tx_packets++;
 475                 return 0;
 476         }
 477
 478         return len;
 479 }
 480
 481 static int bnep_session(void *arg)
 482 {
 483         struct bnep_session *s = arg;
 484         struct net_device *dev = s->dev;
 485         struct sock *sk = s->sock->sk;
 486         struct sk_buff *skb;
 487         wait_queue_entry_t wait;
 488
 489         BT_DBG("");
 490
 491         set_user_nice(current, -15);
 492
 493         init_waitqueue_entry(&wait, current);
 494         add_wait_queue(sk_sleep(sk), &wait);
 495         while (1) {
 496                 set_current_state(TASK_INTERRUPTIBLE);
 497
 498                 if (atomic_read(&s->terminate))
 499                         break;
 500                 /* RX */
 501                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
 502                         skb_orphan(skb);
 503                         if (!skb_linearize(skb))
 504                                 bnep_rx_frame(s, skb);
 505                         else
 506                                 kfree_skb(skb);
 507                 }
 508
 509                 if (sk->sk_state != BT_CONNECTED)
 510                         break;
 511
 512                 /* TX */
 513                 while ((skb = skb_dequeue(&sk->sk_write_queue)))
 514                         if (bnep_tx_frame(s, skb))
 515                                 break;
 516                 netif_wake_queue(dev);
 517
 518                 schedule();
 519         }
 520         __set_current_state(TASK_RUNNING);
 521         remove_wait_queue(sk_sleep(sk), &wait);
 522
 523         /* Cleanup session */
 524         down_write(&bnep_session_sem);
 525
 526         /* Delete network device */
 527         unregister_netdev(dev);
 528
 529         /* Wakeup user-space polling for socket errors */
 530         s->sock->sk->sk_err = EUNATCH;
 531
 532         wake_up_interruptible(sk_sleep(s->sock->sk));
 533
 534         /* Release the socket */
 535         fput(s->sock->file);
 536
 537         __bnep_unlink_session(s);
 538
 539         up_write(&bnep_session_sem);
 540         free_netdev(dev);
 541         module_put_and_exit(0);
 542         return 0;
 543 }
 544
 545 static struct device *bnep_get_device(struct bnep_session *session)
 546 {
 547         struct l2cap_conn *conn = l2cap_pi(session->sock->sk)->chan->conn;
 548
 549         if (!conn || !conn->hcon)
 550                 return NULL;
 551
 552         return &conn->hcon->dev;
 553 }
 554
 555 static struct device_type bnep_type = {
 556         .name   = "bluetooth",
 557 };
 558
 559 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 560 {
 561         u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
 562         struct net_device *dev;
 563         struct bnep_session *s, *ss;
 564         u8 dst[ETH_ALEN], src[ETH_ALEN];
 565         int err;
 566
 567         BT_DBG("");
 568
 569         if (!l2cap_is_socket(sock))
 570                 return -EBADFD;
 571
 572         if (req->flags & ~valid_flags)
 573                 return -EINVAL;
 574
 575         baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
 576         baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);
 577
 578         /* session struct allocated as private part of net_device */
 579         dev = alloc_netdev(sizeof(struct bnep_session),
 580                            (*req->device) ? req->device : "bnep%d",
 581                            NET_NAME_UNKNOWN,
 582                            bnep_net_setup);
 583         if (!dev)
 584                 return -ENOMEM;
 585
 586         down_write(&bnep_session_sem);
 587
 588         ss = __bnep_get_session(dst);
 589         if (ss && ss->state == BT_CONNECTED) {
 590                 err = -EEXIST;
 591                 goto failed;
 592         }
 593
 594         s = netdev_priv(dev);
 595
 596         /* This is rx header therefore addresses are swapped.
 597          * ie. eh.h_dest is our local address. */
 598         memcpy(s->eh.h_dest,   &src, ETH_ALEN);
 599         memcpy(s->eh.h_source, &dst, ETH_ALEN);
 600         memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
 601
 602         s->dev   = dev;
 603         s->sock  = sock;
 604         s->role  = req->role;
 605         s->state = BT_CONNECTED;
 606         s->flags = req->flags;
 607
 608         s->msg.msg_flags = MSG_NOSIGNAL;
 609
 610 #ifdef CONFIG_BT_BNEP_MC_FILTER
 611         /* Set default mc filter to not filter out any mc addresses
 612          * as defined in the BNEP specification (revision 0.95a)
 613          * http://grouper.ieee.org/groups/802/15/Bluetooth/BNEP.pdf
 614          */
 615         s->mc_filter = ~0LL;
 616 #endif
 617
 618 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 619         /* Set default protocol filter */
 620         bnep_set_default_proto_filter(s);
 621 #endif
 622
 623         SET_NETDEV_DEV(dev, bnep_get_device(s));
 624         SET_NETDEV_DEVTYPE(dev, &bnep_type);
 625
 626         err = register_netdev(dev);
 627         if (err)
 628                 goto failed;
 629
 630         __bnep_link_session(s);
 631
 632         __module_get(THIS_MODULE);
 633         s->task = kthread_run(bnep_session, s, "kbnepd %s", dev->name);
 634         if (IS_ERR(s->task)) {
 635                 /* Session thread start failed, gotta cleanup. */
 636                 module_put(THIS_MODULE);
 637                 unregister_netdev(dev);
 638                 __bnep_unlink_session(s);
 639                 err = PTR_ERR(s->task);
 640                 goto failed;
 641         }
 642
 643         up_write(&bnep_session_sem);
 644         strcpy(req->device, dev->name);
 645         return 0;
 646
 647 failed:
 648         up_write(&bnep_session_sem);
 649         free_netdev(dev);
 650         return err;
 651 }
 652
 653 int bnep_del_connection(struct bnep_conndel_req *req)
 654 {
 655         u32 valid_flags = 0;
 656         struct bnep_session *s;
 657         int  err = 0;
 658
 659         BT_DBG("");
 660
 661         if (req->flags & ~valid_flags)
 662                 return -EINVAL;
 663
 664         down_read(&bnep_session_sem);
 665
 666         s = __bnep_get_session(req->dst);
 667         if (s) {
 668                 atomic_inc(&s->terminate);
 669                 wake_up_process(s->task);
 670         } else
 671                 err = -ENOENT;
 672
 673         up_read(&bnep_session_sem);
 674         return err;
 675 }
 676
 677 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
 678 {
 679         u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
 680
 681         memset(ci, 0, sizeof(*ci));
 682         memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
 683         strcpy(ci->device, s->dev->name);
 684         ci->flags = s->flags & valid_flags;
 685         ci->state = s->state;
 686         ci->role  = s->role;
 687 }
 688
 689 int bnep_get_connlist(struct bnep_connlist_req *req)
 690 {
 691         struct bnep_session *s;
 692         int err = 0, n = 0;
 693
 694         down_read(&bnep_session_sem);
 695
 696         list_for_each_entry(s, &bnep_session_list, list) {
 697                 struct bnep_conninfo ci;
 698
 699                 __bnep_copy_ci(&ci, s);
 700
 701                 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
 702                         err = -EFAULT;
 703                         break;
 704                 }
 705
 706                 if (++n >= req->cnum)
 707                         break;
 708
 709                 req->ci++;
 710         }
 711         req->cnum = n;
 712
 713         up_read(&bnep_session_sem);
 714         return err;
 715 }
 716
 717 int bnep_get_conninfo(struct bnep_conninfo *ci)
 718 {
 719         struct bnep_session *s;
 720         int err = 0;
 721
 722         down_read(&bnep_session_sem);
 723
 724         s = __bnep_get_session(ci->dst);
 725         if (s)
 726                 __bnep_copy_ci(ci, s);
 727         else
 728                 err = -ENOENT;
 729
 730         up_read(&bnep_session_sem);
 731         return err;
 732 }
 733
 734 static int __init bnep_init(void)
 735 {
 736         char flt[50] = "";
 737
 738 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 739         strcat(flt, "protocol ");
 740 #endif
 741
 742 #ifdef CONFIG_BT_BNEP_MC_FILTER
 743         strcat(flt, "multicast");
 744 #endif
 745
 746         BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
 747         if (flt[0])
 748                 BT_INFO("BNEP filters: %s", flt);
 749
 750         bnep_sock_init();
 751         return 0;
 752 }
 753
 754 static void __exit bnep_exit(void)
 755 {
 756         bnep_sock_cleanup();
 757 }
 758
 759 module_init(bnep_init);
 760 module_exit(bnep_exit);
 761
 762 module_param(compress_src, bool, 0644);
 763 MODULE_PARM_DESC(compress_src, "Compress sources headers");
 764
 765 module_param(compress_dst, bool, 0644);
 766 MODULE_PARM_DESC(compress_dst, "Compress destination headers");
 767
 768 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 769 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
 770 MODULE_VERSION(VERSION);
 771 MODULE_LICENSE("GPL");
 772 MODULE_ALIAS("bt-proto-4");