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 }