1 /* $NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
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
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
33
34 #define L2CAP_SOCKET_CHECKED
35 #include "btpand.h"
36
37 packet_t *
packet_alloc(channel_t * chan)38 packet_alloc(channel_t *chan)
39 {
40 packet_t *pkt;
41
42 pkt = malloc(sizeof(packet_t) + chan->mru);
43 if (pkt == NULL) {
44 log_err("%s() failed: %m", __func__);
45 return NULL;
46 }
47
48 memset(pkt, 0, sizeof(packet_t));
49 STAILQ_INIT(&pkt->extlist);
50 pkt->ptr = pkt->buf;
51
52 pkt->chan = chan;
53 chan->refcnt++;
54
55 return pkt;
56 }
57
58 void
packet_free(packet_t * pkt)59 packet_free(packet_t *pkt)
60 {
61 exthdr_t *eh;
62
63 if (pkt->refcnt-- > 0)
64 return;
65
66 while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
67 STAILQ_REMOVE_HEAD(&pkt->extlist, next);
68 free(eh);
69 }
70
71 pkt->chan->refcnt--;
72 if (pkt->chan->refcnt == 0)
73 channel_free(pkt->chan);
74
75 free(pkt);
76 }
77
78 void
packet_adj(packet_t * pkt,size_t size)79 packet_adj(packet_t *pkt, size_t size)
80 {
81
82 assert(pkt->refcnt == 0);
83 assert(pkt->len >= size);
84
85 pkt->ptr += size;
86 pkt->len -= size;
87 }
88
89 pkthdr_t *
pkthdr_alloc(packet_t * pkt)90 pkthdr_alloc(packet_t *pkt)
91 {
92 pkthdr_t *ph;
93
94 ph = malloc(sizeof(pkthdr_t));
95 if (ph == NULL) {
96 log_err("%s() failed: %m", __func__);
97 return NULL;
98 }
99
100 ph->data = pkt;
101 pkt->refcnt++;
102
103 return ph;
104 }
105
106 void
pkthdr_free(pkthdr_t * ph)107 pkthdr_free(pkthdr_t *ph)
108 {
109
110 packet_free(ph->data);
111 free(ph);
112 }
113