usr.sbin/btpand/packet.c

   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 #include <sys/cdefs.h>
  29 __RCSID("$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
  30
  31 #include "btpand.h"
  32
  33 packet_t *
  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
  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
  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 *
  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
 103 pkthdr_free(pkthdr_t *ph)
 104 {
 105
 106         packet_free(ph->data);
 107         free(ph);
 108 }