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                 err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP, BNEP_CONN_NOT_ALLOWED);
 235                 break;
 236
 237         default: {
 238                         u8 pkt[3];
 239                         pkt[0] = BNEP_CONTROL;
 240                         pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
 241                         pkt[2] = cmd;
 242                         bnep_send(s, pkt, sizeof(pkt));
 243                 }
 244                 break;
 245         }
 246
 247         return err;
 248 }
 249
 250 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
 251 {
 252         struct bnep_ext_hdr *h;
 253         int err = 0;
 254
 255         do {
 256                 h = (void *) skb->data;
 257                 if (!skb_pull(skb, sizeof(*h))) {
 258                         err = -EILSEQ;
 259                         break;
 260                 }
 261
 262                 BT_DBG("type 0x%x len %d", h->type, h->len);
 263
 264                 switch (h->type & BNEP_TYPE_MASK) {
 265                 case BNEP_EXT_CONTROL:
 266                         bnep_rx_control(s, skb->data, skb->len);
 267                         break;
 268
 269                 default:
 270                         /* Unknown extension, skip it. */
 271                         break;
 272                 }
 273
 274                 if (!skb_pull(skb, h->len)) {
 275                         err = -EILSEQ;
 276                         break;
 277                 }
 278         } while (!err && (h->type & BNEP_EXT_HEADER));
 279
 280         return err;
 281 }
 282
 283 static u8 __bnep_rx_hlen[] = {
 284         ETH_HLEN,     /* BNEP_GENERAL */
 285         0,            /* BNEP_CONTROL */
 286         2,            /* BNEP_COMPRESSED */
 287         ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
 288         ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
 289 };
 290
 291 static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
 292 {
 293         struct net_device *dev = s->dev;
 294         struct sk_buff *nskb;
 295         u8 type;
 296
 297         dev->stats.rx_bytes += skb->len;
 298
 299         type = *(u8 *) skb->data;
 300         skb_pull(skb, 1);
 301
 302         if ((type & BNEP_TYPE_MASK) >= sizeof(__bnep_rx_hlen))
 303                 goto badframe;
 304
 305         if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
 306                 bnep_rx_control(s, skb->data, skb->len);
 307                 kfree_skb(skb);
 308                 return 0;
 309         }
 310
 311         skb_reset_mac_header(skb);
 312
 313         /* Verify and pull out header */
 314         if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
 315                 goto badframe;
 316
 317         s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 318
 319         if (type & BNEP_EXT_HEADER) {
 320                 if (bnep_rx_extension(s, skb) < 0)
 321                         goto badframe;
 322         }
 323
 324         /* Strip 802.1p header */
 325         if (ntohs(s->eh.h_proto) == ETH_P_8021Q) {
 326                 if (!skb_pull(skb, 4))
 327                         goto badframe;
 328                 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 329         }
 330
 331         /* We have to alloc new skb and copy data here :(. Because original skb
 332          * may not be modified and because of the alignment requirements. */
 333         nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
 334         if (!nskb) {
 335                 dev->stats.rx_dropped++;
 336                 kfree_skb(skb);
 337                 return -ENOMEM;
 338         }
 339         skb_reserve(nskb, 2);
 340
 341         /* Decompress header and construct ether frame */
 342         switch (type & BNEP_TYPE_MASK) {
 343         case BNEP_COMPRESSED:
 344                 memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
 345                 break;
 346
 347         case BNEP_COMPRESSED_SRC_ONLY:
 348                 memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
 349                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
 350                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 351                 break;
 352
 353         case BNEP_COMPRESSED_DST_ONLY:
 354                 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
 355                                                                 ETH_ALEN);
 356                 memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
 357                                                                 ETH_ALEN + 2);
 358                 break;
 359
 360         case BNEP_GENERAL:
 361                 memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
 362                                                                 ETH_ALEN * 2);
 363                 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
 364                 break;
 365         }
 366
 367         skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
 368         kfree_skb(skb);
 369
 370         dev->stats.rx_packets++;
 371         nskb->ip_summed = CHECKSUM_NONE;
 372         nskb->protocol  = eth_type_trans(nskb, dev);
 373         netif_rx_ni(nskb);
 374         return 0;
 375
 376 badframe:
 377         dev->stats.rx_errors++;
 378         kfree_skb(skb);
 379         return 0;
 380 }
 381
 382 static u8 __bnep_tx_types[] = {
 383         BNEP_GENERAL,
 384         BNEP_COMPRESSED_SRC_ONLY,
 385         BNEP_COMPRESSED_DST_ONLY,
 386         BNEP_COMPRESSED
 387 };
 388
 389 static int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
 390 {
 391         struct ethhdr *eh = (void *) skb->data;
 392         struct socket *sock = s->sock;
 393         struct kvec iv[3];
 394         int len = 0, il = 0;
 395         u8 type = 0;
 396
 397         BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
 398
 399         if (!skb->dev) {
 400                 /* Control frame sent by us */
 401                 goto send;
 402         }
 403
 404         iv[il++] = (struct kvec) { &type, 1 };
 405         len++;
 406
 407         if (compress_src && ether_addr_equal(eh->h_dest, s->eh.h_source))
 408                 type |= 0x01;
 409
 410         if (compress_dst && ether_addr_equal(eh->h_source, s->eh.h_dest))
 411                 type |= 0x02;
 412
 413         if (type)
 414                 skb_pull(skb, ETH_ALEN * 2);
 415
 416         type = __bnep_tx_types[type];
 417         switch (type) {
 418         case BNEP_COMPRESSED_SRC_ONLY:
 419                 iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
 420                 len += ETH_ALEN;
 421                 break;
 422
 423         case BNEP_COMPRESSED_DST_ONLY:
 424                 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
 425                 len += ETH_ALEN;
 426                 break;
 427         }
 428
 429 send:
 430         iv[il++] = (struct kvec) { skb->data, skb->len };
 431         len += skb->len;
 432
 433         /* FIXME: linearize skb */
 434         {
 435                 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
 436         }
 437         kfree_skb(skb);
 438
 439         if (len > 0) {
 440                 s->dev->stats.tx_bytes += len;
 441                 s->dev->stats.tx_packets++;
 442                 return 0;
 443         }
 444
 445         return len;
 446 }
 447
 448 static int bnep_session(void *arg)
 449 {
 450         struct bnep_session *s = arg;
 451         struct net_device *dev = s->dev;
 452         struct sock *sk = s->sock->sk;
 453         struct sk_buff *skb;
 454         wait_queue_t wait;
 455
 456         BT_DBG("");
 457
 458         set_user_nice(current, -15);
 459
 460         init_waitqueue_entry(&wait, current);
 461         add_wait_queue(sk_sleep(sk), &wait);
 462         while (1) {
 463                 set_current_state(TASK_INTERRUPTIBLE);
 464
 465                 if (atomic_read(&s->terminate))
 466                         break;
 467                 /* RX */
 468                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
 469                         skb_orphan(skb);
 470                         if (!skb_linearize(skb))
 471                                 bnep_rx_frame(s, skb);
 472                         else
 473                                 kfree_skb(skb);
 474                 }
 475
 476                 if (sk->sk_state != BT_CONNECTED)
 477                         break;
 478
 479                 /* TX */
 480                 while ((skb = skb_dequeue(&sk->sk_write_queue)))
 481                         if (bnep_tx_frame(s, skb))
 482                                 break;
 483                 netif_wake_queue(dev);
 484
 485                 schedule();
 486         }
 487         __set_current_state(TASK_RUNNING);
 488         remove_wait_queue(sk_sleep(sk), &wait);
 489
 490         /* Cleanup session */
 491         down_write(&bnep_session_sem);
 492
 493         /* Delete network device */
 494         unregister_netdev(dev);
 495
 496         /* Wakeup user-space polling for socket errors */
 497         s->sock->sk->sk_err = EUNATCH;
 498
 499         wake_up_interruptible(sk_sleep(s->sock->sk));
 500
 501         /* Release the socket */
 502         fput(s->sock->file);
 503
 504         __bnep_unlink_session(s);
 505
 506         up_write(&bnep_session_sem);
 507         free_netdev(dev);
 508         module_put_and_exit(0);
 509         return 0;
 510 }
 511
 512 static struct device *bnep_get_device(struct bnep_session *session)
 513 {
 514         struct l2cap_conn *conn = l2cap_pi(session->sock->sk)->chan->conn;
 515
 516         if (!conn || !conn->hcon)
 517                 return NULL;
 518
 519         return &conn->hcon->dev;
 520 }
 521
 522 static struct device_type bnep_type = {
 523         .name   = "bluetooth",
 524 };
 525
 526 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 527 {
 528         struct net_device *dev;
 529         struct bnep_session *s, *ss;
 530         u8 dst[ETH_ALEN], src[ETH_ALEN];
 531         int err;
 532
 533         BT_DBG("");
 534
 535         if (!l2cap_is_socket(sock))
 536                 return -EBADFD;
 537
 538         baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
 539         baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);
 540
 541         /* session struct allocated as private part of net_device */
 542         dev = alloc_netdev(sizeof(struct bnep_session),
 543                            (*req->device) ? req->device : "bnep%d",
 544                            NET_NAME_UNKNOWN,
 545                            bnep_net_setup);
 546         if (!dev)
 547                 return -ENOMEM;
 548
 549         down_write(&bnep_session_sem);
 550
 551         ss = __bnep_get_session(dst);
 552         if (ss && ss->state == BT_CONNECTED) {
 553                 err = -EEXIST;
 554                 goto failed;
 555         }
 556
 557         s = netdev_priv(dev);
 558
 559         /* This is rx header therefore addresses are swapped.
 560          * ie. eh.h_dest is our local address. */
 561         memcpy(s->eh.h_dest,   &src, ETH_ALEN);
 562         memcpy(s->eh.h_source, &dst, ETH_ALEN);
 563         memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
 564
 565         s->dev   = dev;
 566         s->sock  = sock;
 567         s->role  = req->role;
 568         s->state = BT_CONNECTED;
 569
 570         s->msg.msg_flags = MSG_NOSIGNAL;
 571
 572 #ifdef CONFIG_BT_BNEP_MC_FILTER
 573         /* Set default mc filter */
 574         set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
 575 #endif
 576
 577 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 578         /* Set default protocol filter */
 579         bnep_set_default_proto_filter(s);
 580 #endif
 581
 582         SET_NETDEV_DEV(dev, bnep_get_device(s));
 583         SET_NETDEV_DEVTYPE(dev, &bnep_type);
 584
 585         err = register_netdev(dev);
 586         if (err)
 587                 goto failed;
 588
 589         __bnep_link_session(s);
 590
 591         __module_get(THIS_MODULE);
 592         s->task = kthread_run(bnep_session, s, "kbnepd %s", dev->name);
 593         if (IS_ERR(s->task)) {
 594                 /* Session thread start failed, gotta cleanup. */
 595                 module_put(THIS_MODULE);
 596                 unregister_netdev(dev);
 597                 __bnep_unlink_session(s);
 598                 err = PTR_ERR(s->task);
 599                 goto failed;
 600         }
 601
 602         up_write(&bnep_session_sem);
 603         strcpy(req->device, dev->name);
 604         return 0;
 605
 606 failed:
 607         up_write(&bnep_session_sem);
 608         free_netdev(dev);
 609         return err;
 610 }
 611
 612 int bnep_del_connection(struct bnep_conndel_req *req)
 613 {
 614         struct bnep_session *s;
 615         int  err = 0;
 616
 617         BT_DBG("");
 618
 619         down_read(&bnep_session_sem);
 620
 621         s = __bnep_get_session(req->dst);
 622         if (s) {
 623                 atomic_inc(&s->terminate);
 624                 wake_up_process(s->task);
 625         } else
 626                 err = -ENOENT;
 627
 628         up_read(&bnep_session_sem);
 629         return err;
 630 }
 631
 632 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
 633 {
 634         memset(ci, 0, sizeof(*ci));
 635         memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
 636         strcpy(ci->device, s->dev->name);
 637         ci->flags = s->flags;
 638         ci->state = s->state;
 639         ci->role  = s->role;
 640 }
 641
 642 int bnep_get_connlist(struct bnep_connlist_req *req)
 643 {
 644         struct bnep_session *s;
 645         int err = 0, n = 0;
 646
 647         down_read(&bnep_session_sem);
 648
 649         list_for_each_entry(s, &bnep_session_list, list) {
 650                 struct bnep_conninfo ci;
 651
 652                 __bnep_copy_ci(&ci, s);
 653
 654                 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
 655                         err = -EFAULT;
 656                         break;
 657                 }
 658
 659                 if (++n >= req->cnum)
 660                         break;
 661
 662                 req->ci++;
 663         }
 664         req->cnum = n;
 665
 666         up_read(&bnep_session_sem);
 667         return err;
 668 }
 669
 670 int bnep_get_conninfo(struct bnep_conninfo *ci)
 671 {
 672         struct bnep_session *s;
 673         int err = 0;
 674
 675         down_read(&bnep_session_sem);
 676
 677         s = __bnep_get_session(ci->dst);
 678         if (s)
 679                 __bnep_copy_ci(ci, s);
 680         else
 681                 err = -ENOENT;
 682
 683         up_read(&bnep_session_sem);
 684         return err;
 685 }
 686
 687 static int __init bnep_init(void)
 688 {
 689         char flt[50] = "";
 690
 691 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 692         strcat(flt, "protocol ");
 693 #endif
 694
 695 #ifdef CONFIG_BT_BNEP_MC_FILTER
 696         strcat(flt, "multicast");
 697 #endif
 698
 699         BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
 700         if (flt[0])
 701                 BT_INFO("BNEP filters: %s", flt);
 702
 703         bnep_sock_init();
 704         return 0;
 705 }
 706
 707 static void __exit bnep_exit(void)
 708 {
 709         bnep_sock_cleanup();
 710 }
 711
 712 module_init(bnep_init);
 713 module_exit(bnep_exit);
 714
 715 module_param(compress_src, bool, 0644);
 716 MODULE_PARM_DESC(compress_src, "Compress sources headers");
 717
 718 module_param(compress_dst, bool, 0644);
 719 MODULE_PARM_DESC(compress_dst, "Compress destination headers");
 720
 721 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 722 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
 723 MODULE_VERSION(VERSION);
 724 MODULE_LICENSE("GPL");
 725 MODULE_ALIAS("bt-proto-4");