/*      $NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $        */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008 Iain Hibbert
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include <sys/cdefs.h>
__RCSID("$NetBSD: packet.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");

#define L2CAP_SOCKET_CHECKED
#include "btpand.h"

packet_t *
packet_alloc(channel_t *chan)
{
        packet_t *pkt;

        pkt = malloc(sizeof(packet_t) + chan->mru);
        if (pkt == NULL) {
                log_err("%s() failed: %m", __func__);
                return NULL;
        }

        memset(pkt, 0, sizeof(packet_t));
        STAILQ_INIT(&pkt->extlist);
        pkt->ptr = pkt->buf;

        pkt->chan = chan;
        chan->refcnt++;

        return pkt;
}

void
packet_free(packet_t *pkt)
{
        exthdr_t *eh;

        if (pkt->refcnt-- > 0)
                return;

        while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
                STAILQ_REMOVE_HEAD(&pkt->extlist, next);
                free(eh);
        }

        pkt->chan->refcnt--;
        if (pkt->chan->refcnt == 0)
                channel_free(pkt->chan);

        free(pkt);
}

void
packet_adj(packet_t *pkt, size_t size)
{

        assert(pkt->refcnt == 0);
        assert(pkt->len >= size);

        pkt->ptr += size;
        pkt->len -= size;
}

pkthdr_t *
pkthdr_alloc(packet_t *pkt)
{
        pkthdr_t *ph;

        ph = malloc(sizeof(pkthdr_t));
        if (ph == NULL) {
                log_err("%s() failed: %m", __func__);
                return NULL;
        }

        ph->data = pkt;
        pkt->refcnt++;

        return ph;
}

void
pkthdr_free(pkthdr_t *ph)
{

        packet_free(ph->data);
        free(ph);
}