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Annotation of sys/netbt/hci_misc.c, Revision 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: }