1 /* $NetBSD: packet.c,v 1.2 2009/05/02 20:07:51 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 #include <sys/cdefs.h>
29 __RCSID("$NetBSD: packet.c,v 1.2 2009/05/02 20:07:51 plunky Exp $");
30
31 #include "btpand.h"
32
33 packet_t *
packet_alloc(channel_t * chan)34 packet_alloc(channel_t *chan)
35 {
36 packet_t *pkt;
37
38 pkt = malloc(sizeof(packet_t) + chan->mru);
39 if (pkt == NULL) {
40 log_err("%s() failed: %m", __func__);
41 return NULL;
42 }
43
44 memset(pkt, 0, sizeof(packet_t));
45 STAILQ_INIT(&pkt->extlist);
46 pkt->ptr = pkt->buf;
47
48 pkt->chan = chan;
49 chan->refcnt++;
50
51 return pkt;
52 }
53
54 void
packet_free(packet_t * pkt)55 packet_free(packet_t *pkt)
56 {
57 exthdr_t *eh;
58
59 if (pkt->refcnt-- > 0)
60 return;
61
62 while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
63 STAILQ_REMOVE_HEAD(&pkt->extlist, next);
64 free(eh);
65 }
66
67 pkt->chan->refcnt--;
68 if (pkt->chan->refcnt == 0)
69 channel_free(pkt->chan);
70
71 free(pkt);
72 }
73
74 void
packet_adj(packet_t * pkt,size_t size)75 packet_adj(packet_t *pkt, size_t size)
76 {
77
78 assert(pkt->refcnt == 0);
79 assert(pkt->len >= size);
80
81 pkt->ptr += size;
82 pkt->len -= size;
83 }
84
85 pkthdr_t *
pkthdr_alloc(packet_t * pkt)86 pkthdr_alloc(packet_t *pkt)
87 {
88 pkthdr_t *ph;
89
90 ph = malloc(sizeof(pkthdr_t));
91 if (ph == NULL) {
92 log_err("%s() failed: %m", __func__);
93 return NULL;
94 }
95
96 ph->data = pkt;
97 pkt->refcnt++;
98
99 return ph;
100 }
101
102 void
pkthdr_free(pkthdr_t * ph)103 pkthdr_free(pkthdr_t *ph)
104 {
105
106 packet_free(ph->data);
107 free(ph);
108 }
109