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Annotation of sys/netbt/hci_misc.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: hci_misc.c,v 1.1 2007/05/30 03:42:53 uwe Exp $        */
                      2: /*     $NetBSD: hci_misc.c,v 1.1 2006/06/19 15:44:45 gdamore Exp $     */
                      3:
                      4: /*-
                      5:  * Copyright (c) 2005 Iain Hibbert.
                      6:  * Copyright (c) 2006 Itronix Inc.
                      7:  * All rights reserved.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. The name of Itronix Inc. may not be used to endorse
                     18:  *    or promote products derived from this software without specific
                     19:  *    prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     23:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     24:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
                     25:  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     26:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
                     27:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
                     28:  * ON ANY THEORY OF LIABILITY, WHETHER IN
                     29:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     30:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     31:  * POSSIBILITY OF SUCH DAMAGE.
                     32:  */
                     33:
                     34: #include <sys/cdefs.h>
                     35:
                     36: #include <sys/param.h>
                     37: #include <sys/kernel.h>
                     38: #include <sys/malloc.h>
                     39: #include <sys/mbuf.h>
                     40: #include <sys/proc.h>
                     41: #include <sys/queue.h>
                     42: #include <sys/systm.h>
                     43:
                     44: #include <netbt/bluetooth.h>
                     45: #include <netbt/hci.h>
                     46:
                     47: /*
                     48:  * cache Inquiry Responses for this number of seconds for routing
                     49:  * purposes [sysctl]
                     50:  */
                     51: int hci_memo_expiry = 600;
                     52:
                     53: /*
                     54:  * set 'src' address for routing to 'dest'
                     55:  */
                     56: int
                     57: hci_route_lookup(bdaddr_t *src, bdaddr_t *dest)
                     58: {
                     59:        struct hci_unit *unit;
                     60:        struct hci_link *link;
                     61:        struct hci_memo *memo;
                     62:
                     63:        /*
                     64:         * Walk the ACL connections, if we have a connection
                     65:         * to 'dest' already then thats best..
                     66:         */
                     67:        TAILQ_FOREACH(unit, &hci_unit_list, hci_next) {
                     68:                if ((unit->hci_flags & BTF_UP) == 0)
                     69:                        continue;
                     70:
                     71:                TAILQ_FOREACH(link, &unit->hci_links, hl_next) {
                     72:                        if (link->hl_type != HCI_LINK_ACL)
                     73:                                continue;
                     74:
                     75:                        if (bdaddr_same(&link->hl_bdaddr, dest))
                     76:                                goto found;
                     77:                }
                     78:        }
                     79:
                     80:        /*
                     81:         * Now check all the memos to see if there has been an
                     82:         * inquiry repsonse..
                     83:         */
                     84:        TAILQ_FOREACH(unit, &hci_unit_list, hci_next) {
                     85:                if ((unit->hci_flags & BTF_UP) == 0)
                     86:                        continue;
                     87:
                     88:                memo = hci_memo_find(unit, dest);
                     89:                if (memo)
                     90:                        goto found;
                     91:        }
                     92:
                     93:        /*
                     94:         * Last ditch effort, lets use the first unit we find
                     95:         * thats up and running. (XXX settable default route?)
                     96:         */
                     97:        TAILQ_FOREACH(unit, &hci_unit_list, hci_next) {
                     98:                if ((unit->hci_flags & BTF_UP) == 0)
                     99:                        continue;
                    100:
                    101:                goto found;
                    102:        }
                    103:
                    104:        return EHOSTUNREACH;
                    105:
                    106: found:
                    107:        bdaddr_copy(src, &unit->hci_bdaddr);
                    108:        return 0;
                    109: }
                    110:
                    111: /*
                    112:  * find unit memo from bdaddr
                    113:  */
                    114: struct hci_memo *
                    115: hci_memo_find(struct hci_unit *unit, bdaddr_t *bdaddr)
                    116: {
                    117:        struct hci_memo *memo, *m0;
                    118:        struct timeval now;
                    119:
                    120:        microtime(&now);
                    121:
                    122:        m0 = LIST_FIRST(&unit->hci_memos);
                    123:        while ((memo = m0) != NULL) {
                    124:                m0 = LIST_NEXT(memo, next);
                    125:
                    126:                if (now.tv_sec > memo->time.tv_sec + hci_memo_expiry) {
                    127:                        DPRINTF("memo %p too old (expiring)\n", memo);
                    128:                        hci_memo_free(memo);
                    129:                        continue;
                    130:                }
                    131:
                    132:                if (bdaddr_same(bdaddr, &memo->response.bdaddr)) {
                    133:                        DPRINTF("memo %p found\n", memo);
                    134:                        return memo;
                    135:                }
                    136:        }
                    137:
                    138:        DPRINTF("no memo found\n");
                    139:        return NULL;
                    140: }
                    141:
                    142: void
                    143: hci_memo_free(struct hci_memo *memo)
                    144: {
                    145:
                    146:        LIST_REMOVE(memo, next);
                    147:        free(memo, M_BLUETOOTH);
                    148: }