packet.c revision 302408 
1/*	$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $	*/
2
3/*-
4 * Copyright (c) 2008 Iain Hibbert
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/* $FreeBSD: stable/11/usr.sbin/bluetooth/btpand/packet.c 281210 2015-04-07 16:48:23Z takawata $ */
29
30#include <sys/cdefs.h>
31__RCSID("$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
32
33#define L2CAP_SOCKET_CHECKED
34#include "btpand.h"
35
36packet_t *
37packet_alloc(channel_t *chan)
38{
39	packet_t *pkt;
40
41	pkt = malloc(sizeof(packet_t) + chan->mru);
42	if (pkt == NULL) {
43		log_err("%s() failed: %m", __func__);
44		return NULL;
45	}
46
47	memset(pkt, 0, sizeof(packet_t));
48	STAILQ_INIT(&pkt->extlist);
49	pkt->ptr = pkt->buf;
50
51	pkt->chan = chan;
52	chan->refcnt++;
53
54	return pkt;
55}
56
57void
58packet_free(packet_t *pkt)
59{
60	exthdr_t *eh;
61
62	if (pkt->refcnt-- > 0)
63		return;
64
65	while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
66		STAILQ_REMOVE_HEAD(&pkt->extlist, next);
67		free(eh);
68	}
69
70	pkt->chan->refcnt--;
71	if (pkt->chan->refcnt == 0)
72		channel_free(pkt->chan);
73
74	free(pkt);
75}
76
77void
78packet_adj(packet_t *pkt, size_t size)
79{
80
81	assert(pkt->refcnt == 0);
82	assert(pkt->len >= size);
83
84	pkt->ptr += size;
85	pkt->len -= size;
86}
87
88pkthdr_t *
89pkthdr_alloc(packet_t *pkt)
90{
91	pkthdr_t *ph;
92
93	ph = malloc(sizeof(pkthdr_t));
94	if (ph == NULL) {
95		log_err("%s() failed: %m", __func__);
96		return NULL;
97	}
98
99	ph->data = pkt;
100	pkt->refcnt++;
101
102	return ph;
103}
104
105void
106pkthdr_free(pkthdr_t *ph)
107{
108
109	packet_free(ph->data);
110	free(ph);
111}
112