FreeBSD/Linux Kernel Cross Reference
sys/netbt/hci_misc.c

     /*      $NetBSD: hci_misc.c,v 1.1 2006/06/19 15:44:45 gdamore Exp $     */
     
     /*-
      * Copyright (c) 2005 Iain Hibbert.
      * Copyright (c) 2006 Itronix Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of Itronix Inc. may not be used to endorse
     *    or promote products derived from this software without specific
     *    prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
     * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: hci_misc.c,v 1.1 2006/06/19 15:44:45 gdamore Exp $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/proc.h>
    #include <sys/queue.h>
    #include <sys/systm.h>
    
    #include <netbt/bluetooth.h>
    #include <netbt/hci.h>
    
    /*
     * cache Inquiry Responses for this number of seconds for routing
     * purposes [sysctl]
     */
    int hci_memo_expiry = 600;
    
    /*
     * set 'src' address for routing to 'dest'
     */
    int
    hci_route_lookup(bdaddr_t *src, bdaddr_t *dest)
    {
            struct hci_unit *unit;
            struct hci_link *link;
            struct hci_memo *memo;
    
            /*
             * Walk the ACL connections, if we have a connection
             * to 'dest' already then thats best..
             */
            SIMPLEQ_FOREACH(unit, &hci_unit_list, hci_next) {
                    if ((unit->hci_flags & BTF_UP) == 0)
                            continue;
    
                    TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
                            if (link->hl_type != HCI_LINK_ACL)
                                    continue;
    
                            if (bdaddr_same(&link->hl_bdaddr, dest))
                                    goto found;
                    }
            }
    
            /*
             * Now check all the memos to see if there has been an
             * inquiry repsonse..
             */
            SIMPLEQ_FOREACH(unit, &hci_unit_list, hci_next) {
                    if ((unit->hci_flags & BTF_UP) == 0)
                            continue;
    
                    memo = hci_memo_find(unit, dest);
                    if (memo)
                            goto found;
            }
    
            /*
             * Last ditch effort, lets use the first unit we find
             * thats up and running. (XXX settable default route?)
             */
            SIMPLEQ_FOREACH(unit, &hci_unit_list, hci_next) {
                    if ((unit->hci_flags & BTF_UP) == 0)
                            continue;
   
                   goto found;
           }
   
           return EHOSTUNREACH;
   
   found:
           bdaddr_copy(src, &unit->hci_bdaddr);
           return 0;
   }
   
   /*
    * find unit memo from bdaddr
    */
   struct hci_memo *
   hci_memo_find(struct hci_unit *unit, bdaddr_t *bdaddr)
   {
           struct hci_memo *memo, *m0;
           struct timeval now;
   
           microtime(&now);
   
           m0 = LIST_FIRST(&unit->hci_memos);
           while ((memo = m0) != NULL) {
                   m0 = LIST_NEXT(memo, next);
   
                   if (now.tv_sec > memo->time.tv_sec + hci_memo_expiry) {
                           DPRINTF("memo %p too old (expiring)\n", memo);
                           hci_memo_free(memo);
                           continue;
                   }
   
                   if (bdaddr_same(bdaddr, &memo->response.bdaddr)) {
                           DPRINTF("memo %p found\n", memo);
                           return memo;
                   }
           }
   
           DPRINTF("no memo found\n");
           return NULL;
   }
   
   void
   hci_memo_free(struct hci_memo *memo)
   {
   
           LIST_REMOVE(memo, next);
           free(memo, M_BLUETOOTH);
   }

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