1 /* $NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 2008 Iain Hibbert
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 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /* $FreeBSD$ */
31
32 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
34
35 #define L2CAP_SOCKET_CHECKED
36 #include "btpand.h"
37
38 packet_t *
packet_alloc(channel_t * chan)39 packet_alloc(channel_t *chan)
40 {
41 packet_t *pkt;
42
43 pkt = malloc(sizeof(packet_t) + chan->mru);
44 if (pkt == NULL) {
45 log_err("%s() failed: %m", __func__);
46 return NULL;
47 }
48
49 memset(pkt, 0, sizeof(packet_t));
50 STAILQ_INIT(&pkt->extlist);
51 pkt->ptr = pkt->buf;
52
53 pkt->chan = chan;
54 chan->refcnt++;
55
56 return pkt;
57 }
58
59 void
packet_free(packet_t * pkt)60 packet_free(packet_t *pkt)
61 {
62 exthdr_t *eh;
63
64 if (pkt->refcnt-- > 0)
65 return;
66
67 while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
68 STAILQ_REMOVE_HEAD(&pkt->extlist, next);
69 free(eh);
70 }
71
72 pkt->chan->refcnt--;
73 if (pkt->chan->refcnt == 0)
74 channel_free(pkt->chan);
75
76 free(pkt);
77 }
78
79 void
packet_adj(packet_t * pkt,size_t size)80 packet_adj(packet_t *pkt, size_t size)
81 {
82
83 assert(pkt->refcnt == 0);
84 assert(pkt->len >= size);
85
86 pkt->ptr += size;
87 pkt->len -= size;
88 }
89
90 pkthdr_t *
pkthdr_alloc(packet_t * pkt)91 pkthdr_alloc(packet_t *pkt)
92 {
93 pkthdr_t *ph;
94
95 ph = malloc(sizeof(pkthdr_t));
96 if (ph == NULL) {
97 log_err("%s() failed: %m", __func__);
98 return NULL;
99 }
100
101 ph->data = pkt;
102 pkt->refcnt++;
103
104 return ph;
105 }
106
107 void
pkthdr_free(pkthdr_t * ph)108 pkthdr_free(pkthdr_t *ph)
109 {
110
111 packet_free(ph->data);
112 free(ph);
113 }
114