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 /*
  29  * $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
  30  */
  31
  32 #include <linux/module.h>
  33
  34 #include <linux/kernel.h>
  35 #include <linux/sched.h>
  36 #include <linux/signal.h>
  37 #include <linux/init.h>
  38 #include <linux/wait.h>
  39 #include <linux/freezer.h>
  40 #include <linux/errno.h>
  41 #include <linux/net.h>
  42 #include <net/sock.h>
  43
  44 #include <linux/socket.h>
  45 #include <linux/file.h>
  46
  47 #include <linux/netdevice.h>
  48 #include <linux/etherdevice.h>
  49 #include <linux/skbuff.h>
  50
  51 #include <asm/unaligned.h>
  52
  53 #include <net/bluetooth/bluetooth.h>
  54 #include <net/bluetooth/hci_core.h>
  55 #include <net/bluetooth/l2cap.h>
  56
  57 #include "bnep.h"
  58
  59 #ifndef CONFIG_BT_BNEP_DEBUG
  60 #undef  BT_DBG
  61 #define BT_DBG(D...)
  62 #endif
  63
  64 #define VERSION "1.2"
  65
  66 static LIST_HEAD(bnep_session_list);
  67 static DECLARE_RWSEM(bnep_session_sem);
  68
  69 static struct bnep_session *__bnep_get_session(u8 *dst)
  70 {
  71         struct bnep_session *s;
  72         struct list_head *p;
  73
  74         BT_DBG("");
  75
  76         list_for_each(p, &bnep_session_list) {
  77                 s = list_entry(p, struct bnep_session, list);
  78                 if (!compare_ether_addr(dst, s->eh.h_source))
  79                         return s;
  80         }
  81         return NULL;
  82 }
  83
  84 static void __bnep_link_session(struct bnep_session *s)
  85 {
  86         /* It's safe to call __module_get() here because sessions are added
  87            by the socket layer which has to hold the refference to this module.
  88          */
  89         __module_get(THIS_MODULE);
  90         list_add(&s->list, &bnep_session_list);
  91 }
  92
  93 static void __bnep_unlink_session(struct bnep_session *s)
  94 {
  95         list_del(&s->list);
  96         module_put(THIS_MODULE);
  97 }
  98
  99 static int bnep_send(struct bnep_session *s, void *data, size_t len)
 100 {
 101         struct socket *sock = s->sock;
 102         struct kvec iv = { data, len };
 103
 104         return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
 105 }
 106
 107 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
 108 {
 109         struct bnep_control_rsp rsp;
 110         rsp.type = BNEP_CONTROL;
 111         rsp.ctrl = ctrl;
 112         rsp.resp = htons(resp);
 113         return bnep_send(s, &rsp, sizeof(rsp));
 114 }
 115
 116 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 117 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
 118 {
 119         /* (IPv4, ARP)  */
 120         s->proto_filter[0].start = ETH_P_IP;
 121         s->proto_filter[0].end   = ETH_P_ARP;
 122         /* (RARP, AppleTalk) */
 123         s->proto_filter[1].start = ETH_P_RARP;
 124         s->proto_filter[1].end   = ETH_P_AARP;
 125         /* (IPX, IPv6) */
 126         s->proto_filter[2].start = ETH_P_IPX;
 127         s->proto_filter[2].end   = ETH_P_IPV6;
 128 }
 129 #endif
 130
 131 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
 132 {
 133         int n;
 134
 135         if (len < 2)
 136                 return -EILSEQ;
 137
 138         n = ntohs(get_unaligned(data));
 139         data++; len -= 2;
 140
 141         if (len < n)
 142                 return -EILSEQ;
 143
 144         BT_DBG("filter len %d", n);
 145
 146 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 147         n /= 4;
 148         if (n <= BNEP_MAX_PROTO_FILTERS) {
 149                 struct bnep_proto_filter *f = s->proto_filter;
 150                 int i;
 151
 152                 for (i = 0; i < n; i++) {
 153                         f[i].start = ntohs(get_unaligned(data++));
 154                         f[i].end   = ntohs(get_unaligned(data++));
 155
 156                         BT_DBG("proto filter start %d end %d",
 157                                 f[i].start, f[i].end);
 158                 }
 159
 160                 if (i < BNEP_MAX_PROTO_FILTERS)
 161                         memset(f + i, 0, sizeof(*f));
 162
 163                 if (n == 0)
 164                         bnep_set_default_proto_filter(s);
 165
 166                 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
 167         } else {
 168                 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
 169         }
 170 #else
 171         bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
 172 #endif
 173         return 0;
 174 }
 175
 176 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
 177 {
 178         int n;
 179
 180         if (len < 2)
 181                 return -EILSEQ;
 182
 183         n = ntohs(get_unaligned((__be16 *) data));
 184         data += 2; len -= 2;
 185
 186         if (len < n)
 187                 return -EILSEQ;
 188
 189         BT_DBG("filter len %d", n);
 190
 191 #ifdef CONFIG_BT_BNEP_MC_FILTER
 192         n /= (ETH_ALEN * 2);
 193
 194         if (n > 0) {
 195                 s->mc_filter = 0;
 196
 197                 /* Always send broadcast */
 198                 set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
 199
 200                 /* Add address ranges to the multicast hash */
 201                 for (; n > 0; n--) {
 202                         u8 a1[6], *a2;
 203
 204                         memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
 205                         a2 = data; data += ETH_ALEN;
 206
 207                         BT_DBG("mc filter %s -> %s",
 208                                 batostr((void *) a1), batostr((void *) a2));
 209
 210                         #define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
 211
 212                         /* Iterate from a1 to a2 */
 213                         set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
 214                         while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
 215                                 INCA(a1);
 216                                 set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
 217                         }
 218                 }
 219         }
 220
 221         BT_DBG("mc filter hash 0x%llx", s->mc_filter);
 222
 223         bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
 224 #else
 225         bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
 226 #endif
 227         return 0;
 228 }
 229
 230 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
 231 {
 232         u8  cmd = *(u8 *)data;
 233         int err = 0;
 234
 235         data++; len--;
 236
 237         switch (cmd) {
 238         case BNEP_CMD_NOT_UNDERSTOOD:
 239         case BNEP_SETUP_CONN_REQ:
 240         case BNEP_SETUP_CONN_RSP:
 241         case BNEP_FILTER_NET_TYPE_RSP:
 242         case BNEP_FILTER_MULTI_ADDR_RSP:
 243                 /* Ignore these for now */
 244                 break;
 245
 246         case BNEP_FILTER_NET_TYPE_SET:
 247                 err = bnep_ctrl_set_netfilter(s, data, len);
 248                 break;
 249
 250         case BNEP_FILTER_MULTI_ADDR_SET:
 251                 err = bnep_ctrl_set_mcfilter(s, data, len);
 252                 break;
 253
 254         default: {
 255                         u8 pkt[3];
 256                         pkt[0] = BNEP_CONTROL;
 257                         pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
 258                         pkt[2] = cmd;
 259                         bnep_send(s, pkt, sizeof(pkt));
 260                 }
 261                 break;
 262         }
 263
 264         return err;
 265 }
 266
 267 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
 268 {
 269         struct bnep_ext_hdr *h;
 270         int err = 0;
 271
 272         do {
 273                 h = (void *) skb->data;
 274                 if (!skb_pull(skb, sizeof(*h))) {
 275                         err = -EILSEQ;
 276                         break;
 277                 }
 278
 279                 BT_DBG("type 0x%x len %d", h->type, h->len);
 280
 281                 switch (h->type & BNEP_TYPE_MASK) {
 282                 case BNEP_EXT_CONTROL:
 283                         bnep_rx_control(s, skb->data, skb->len);
 284                         break;
 285
 286                 default:
 287                         /* Unknown extension, skip it. */
 288                         break;
 289                 }
 290
 291                 if (!skb_pull(skb, h->len)) {
 292                         err = -EILSEQ;
 293                         break;
 294                 }
 295         } while (!err && (h->type & BNEP_EXT_HEADER));
 296
 297         return err;
 298 }
 299
 300 static u8 __bnep_rx_hlen[] = {
 301         ETH_HLEN,     /* BNEP_GENERAL */
 302         0,            /* BNEP_CONTROL */
 303         2,            /* BNEP_COMPRESSED */
 304         ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
 305         ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
 306 };
 307 #define BNEP_RX_TYPES   (sizeof(__bnep_rx_hlen) - 1)
 308
 309 static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
 310 {
 311         struct net_device *dev = s->dev;
 312         struct sk_buff *nskb;
 313         u8 type;
 314
 315         dev->last_rx = jiffies;
 316         s->stats.rx_bytes += skb->len;
 317
 318         type = *(u8 *) skb->data; skb_pull(skb, 1);
 319
 320         if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
 321                 goto badframe;
 322
 323         if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
 324                 bnep_rx_control(s, skb->data, skb->len);
 325                 kfree_skb(skb);
 326                 return 0;
 327         }
 328
 329         skb_reset_mac_header(skb);
 330
 331         /* Verify and pull out header */
 332         if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
 333                 goto badframe;
 334
 335         s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 336
 337         if (type & BNEP_EXT_HEADER) {
 338                 if (bnep_rx_extension(s, skb) < 0)
 339                         goto badframe;
 340         }
 341
 342         /* Strip 802.1p header */
 343         if (ntohs(s->eh.h_proto) == 0x8100) {
 344                 if (!skb_pull(skb, 4))
 345                         goto badframe;
 346                 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 347         }
 348
 349         /* We have to alloc new skb and copy data here :(. Because original skb
 350          * may not be modified and because of the alignment requirements. */
 351         nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
 352         if (!nskb) {
 353                 s->stats.rx_dropped++;
 354                 kfree_skb(skb);
 355                 return -ENOMEM;
 356         }
 357         skb_reserve(nskb, 2);
 358
 359         /* Decompress header and construct ether frame */
 360         switch (type & BNEP_TYPE_MASK) {
 361         case BNEP_COMPRESSED:
 362                 memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
 363                 break;
 364
 365         case BNEP_COMPRESSED_SRC_ONLY:
 366                 memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
 367                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
 368                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 369                 break;
 370
 371         case BNEP_COMPRESSED_DST_ONLY:
 372                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
 373                        ETH_ALEN);
 374                 memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
 375                        ETH_ALEN + 2);
 376                 break;
 377
 378         case BNEP_GENERAL:
 379                 memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
 380                        ETH_ALEN * 2);
 381                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 382                 break;
 383         }
 384
 385         skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
 386         kfree_skb(skb);
 387
 388         s->stats.rx_packets++;
 389         nskb->ip_summed = CHECKSUM_NONE;
 390         nskb->protocol  = eth_type_trans(nskb, dev);
 391         netif_rx_ni(nskb);
 392         return 0;
 393
 394 badframe:
 395         s->stats.rx_errors++;
 396         kfree_skb(skb);
 397         return 0;
 398 }
 399
 400 static u8 __bnep_tx_types[] = {
 401         BNEP_GENERAL,
 402         BNEP_COMPRESSED_SRC_ONLY,
 403         BNEP_COMPRESSED_DST_ONLY,
 404         BNEP_COMPRESSED
 405 };
 406
 407 static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
 408 {
 409         struct ethhdr *eh = (void *) skb->data;
 410         struct socket *sock = s->sock;
 411         struct kvec iv[3];
 412         int len = 0, il = 0;
 413         u8 type = 0;
 414
 415         BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
 416
 417         if (!skb->dev) {
 418                 /* Control frame sent by us */
 419                 goto send;
 420         }
 421
 422         iv[il++] = (struct kvec) { &type, 1 };
 423         len++;
 424
 425         if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
 426                 type |= 0x01;
 427
 428         if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
 429                 type |= 0x02;
 430
 431         if (type)
 432                 skb_pull(skb, ETH_ALEN * 2);
 433
 434         type = __bnep_tx_types[type];
 435         switch (type) {
 436         case BNEP_COMPRESSED_SRC_ONLY:
 437                 iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
 438                 len += ETH_ALEN;
 439                 break;
 440
 441         case BNEP_COMPRESSED_DST_ONLY:
 442                 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
 443                 len += ETH_ALEN;
 444                 break;
 445         }
 446
 447 send:
 448         iv[il++] = (struct kvec) { skb->data, skb->len };
 449         len += skb->len;
 450
 451         /* FIXME: linearize skb */
 452         {
 453                 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
 454         }
 455         kfree_skb(skb);
 456
 457         if (len > 0) {
 458                 s->stats.tx_bytes += len;
 459                 s->stats.tx_packets++;
 460                 return 0;
 461         }
 462
 463         return len;
 464 }
 465
 466 static int bnep_session(void *arg)
 467 {
 468         struct bnep_session *s = arg;
 469         struct net_device *dev = s->dev;
 470         struct sock *sk = s->sock->sk;
 471         struct sk_buff *skb;
 472         wait_queue_t wait;
 473
 474         BT_DBG("");
 475
 476         daemonize("kbnepd %s", dev->name);
 477         set_user_nice(current, -15);
 478
 479         init_waitqueue_entry(&wait, current);
 480         add_wait_queue(sk->sk_sleep, &wait);
 481         while (!atomic_read(&s->killed)) {
 482                 set_current_state(TASK_INTERRUPTIBLE);
 483
 484                 // RX
 485                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
 486                         skb_orphan(skb);
 487                         bnep_rx_frame(s, skb);
 488                 }
 489
 490                 if (sk->sk_state != BT_CONNECTED)
 491                         break;
 492
 493                 // TX
 494                 while ((skb = skb_dequeue(&sk->sk_write_queue)))
 495                         if (bnep_tx_frame(s, skb))
 496                                 break;
 497                 netif_wake_queue(dev);
 498
 499                 schedule();
 500         }
 501         set_current_state(TASK_RUNNING);
 502         remove_wait_queue(sk->sk_sleep, &wait);
 503
 504         /* Cleanup session */
 505         down_write(&bnep_session_sem);
 506
 507         /* Delete network device */
 508         unregister_netdev(dev);
 509
 510         /* Release the socket */
 511         fput(s->sock->file);
 512
 513         __bnep_unlink_session(s);
 514
 515         up_write(&bnep_session_sem);
 516         free_netdev(dev);
 517         return 0;
 518 }
 519
 520 static struct device *bnep_get_device(struct bnep_session *session)
 521 {
 522         bdaddr_t *src = &bt_sk(session->sock->sk)->src;
 523         bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
 524         struct hci_dev *hdev;
 525         struct hci_conn *conn;
 526
 527         hdev = hci_get_route(dst, src);
 528         if (!hdev)
 529                 return NULL;
 530
 531         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 532
 533         hci_dev_put(hdev);
 534
 535         return conn ? &conn->dev : NULL;
 536 }
 537
 538 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 539 {
 540         struct net_device *dev;
 541         struct bnep_session *s, *ss;
 542         u8 dst[ETH_ALEN], src[ETH_ALEN];
 543         int err;
 544
 545         BT_DBG("");
 546
 547         baswap((void *) dst, &bt_sk(sock->sk)->dst);
 548         baswap((void *) src, &bt_sk(sock->sk)->src);
 549
 550         /* session struct allocated as private part of net_device */
 551         dev = alloc_netdev(sizeof(struct bnep_session),
 552                            (*req->device) ? req->device : "bnep%d",
 553                            bnep_net_setup);
 554         if (!dev)
 555                 return -ENOMEM;
 556
 557         down_write(&bnep_session_sem);
 558
 559         ss = __bnep_get_session(dst);
 560         if (ss && ss->state == BT_CONNECTED) {
 561                 err = -EEXIST;
 562                 goto failed;
 563         }
 564
 565         s = dev->priv;
 566
 567         /* This is rx header therefore addresses are swapped.
 568          * ie eh.h_dest is our local address. */
 569         memcpy(s->eh.h_dest,   &src, ETH_ALEN);
 570         memcpy(s->eh.h_source, &dst, ETH_ALEN);
 571         memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
 572
 573         s->dev   = dev;
 574         s->sock  = sock;
 575         s->role  = req->role;
 576         s->state = BT_CONNECTED;
 577
 578         s->msg.msg_flags = MSG_NOSIGNAL;
 579
 580 #ifdef CONFIG_BT_BNEP_MC_FILTER
 581         /* Set default mc filter */
 582         set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
 583 #endif
 584
 585 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 586         /* Set default protocol filter */
 587         bnep_set_default_proto_filter(s);
 588 #endif
 589
 590         SET_NETDEV_DEV(dev, bnep_get_device(s));
 591
 592         err = register_netdev(dev);
 593         if (err) {
 594                 goto failed;
 595         }
 596
 597         __bnep_link_session(s);
 598
 599         err = kernel_thread(bnep_session, s, CLONE_KERNEL);
 600         if (err < 0) {
 601                 /* Session thread start failed, gotta cleanup. */
 602                 unregister_netdev(dev);
 603                 __bnep_unlink_session(s);
 604                 goto failed;
 605         }
 606
 607         up_write(&bnep_session_sem);
 608         strcpy(req->device, dev->name);
 609         return 0;
 610
 611 failed:
 612         up_write(&bnep_session_sem);
 613         free_netdev(dev);
 614         return err;
 615 }
 616
 617 int bnep_del_connection(struct bnep_conndel_req *req)
 618 {
 619         struct bnep_session *s;
 620         int  err = 0;
 621
 622         BT_DBG("");
 623
 624         down_read(&bnep_session_sem);
 625
 626         s = __bnep_get_session(req->dst);
 627         if (s) {
 628                 /* Wakeup user-space which is polling for socket errors.
 629                  * This is temporary hack untill we have shutdown in L2CAP */
 630                 s->sock->sk->sk_err = EUNATCH;
 631
 632                 /* Kill session thread */
 633                 atomic_inc(&s->killed);
 634                 wake_up_interruptible(s->sock->sk->sk_sleep);
 635         } else
 636                 err = -ENOENT;
 637
 638         up_read(&bnep_session_sem);
 639         return err;
 640 }
 641
 642 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
 643 {
 644         memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
 645         strcpy(ci->device, s->dev->name);
 646         ci->flags = s->flags;
 647         ci->state = s->state;
 648         ci->role  = s->role;
 649 }
 650
 651 int bnep_get_connlist(struct bnep_connlist_req *req)
 652 {
 653         struct list_head *p;
 654         int err = 0, n = 0;
 655
 656         down_read(&bnep_session_sem);
 657
 658         list_for_each(p, &bnep_session_list) {
 659                 struct bnep_session *s;
 660                 struct bnep_conninfo ci;
 661
 662                 s = list_entry(p, struct bnep_session, list);
 663
 664                 __bnep_copy_ci(&ci, s);
 665
 666                 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
 667                         err = -EFAULT;
 668                         break;
 669                 }
 670
 671                 if (++n >= req->cnum)
 672                         break;
 673
 674                 req->ci++;
 675         }
 676         req->cnum = n;
 677
 678         up_read(&bnep_session_sem);
 679         return err;
 680 }
 681
 682 int bnep_get_conninfo(struct bnep_conninfo *ci)
 683 {
 684         struct bnep_session *s;
 685         int err = 0;
 686
 687         down_read(&bnep_session_sem);
 688
 689         s = __bnep_get_session(ci->dst);
 690         if (s)
 691                 __bnep_copy_ci(ci, s);
 692         else
 693                 err = -ENOENT;
 694
 695         up_read(&bnep_session_sem);
 696         return err;
 697 }
 698
 699 static int __init bnep_init(void)
 700 {
 701         char flt[50] = "";
 702
 703         l2cap_load();
 704
 705 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 706         strcat(flt, "protocol ");
 707 #endif
 708
 709 #ifdef CONFIG_BT_BNEP_MC_FILTER
 710         strcat(flt, "multicast");
 711 #endif
 712
 713         BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
 714         if (flt[0])
 715                 BT_INFO("BNEP filters: %s", flt);
 716
 717         bnep_sock_init();
 718         return 0;
 719 }
 720
 721 static void __exit bnep_exit(void)
 722 {
 723         bnep_sock_cleanup();
 724 }
 725
 726 module_init(bnep_init);
 727 module_exit(bnep_exit);
 728
 729 MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
 730 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
 731 MODULE_VERSION(VERSION);
 732 MODULE_LICENSE("GPL");
 733 MODULE_ALIAS("bt-proto-4");