/*      $NetBSD: btpand.h,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/types.h>
#include <sys/queue.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/ethernet.h>

#include <assert.h>
#include <bluetooth.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>

#include "event.h"

#ifndef __arraycount
#define __arraycount(__x)       (int)(sizeof((__x)) / sizeof((__x)[0]))
#endif

#ifndef L2CAP_PSM_INVALID
#define L2CAP_PSM_INVALID(psm)  (((psm) & 0x0101) != 0x0001)
#endif

#ifndef L2CAP_PSM_BNEP
#define L2CAP_PSM_BNEP  15
#endif

typedef struct channel  channel_t;
typedef struct pfilter  pfilter_t;
typedef struct mfilter  mfilter_t;
typedef struct packet   packet_t;
typedef struct pkthdr   pkthdr_t;
typedef struct pktlist  pktlist_t;
typedef struct exthdr   exthdr_t;
typedef struct extlist  extlist_t;

LIST_HEAD(chlist, channel);
STAILQ_HEAD(extlist, exthdr);
STAILQ_HEAD(pktlist, pkthdr);

enum channel_state {
        CHANNEL_CLOSED,
        CHANNEL_WAIT_CONNECT_REQ,
        CHANNEL_WAIT_CONNECT_RSP,
        CHANNEL_OPEN,
};

#define CHANNEL_MAXQLEN         128

/* BNEP or tap channel */
struct channel {
        enum channel_state      state;
        bool                    oactive;

        uint8_t                 laddr[ETHER_ADDR_LEN];
        uint8_t                 raddr[ETHER_ADDR_LEN];
        size_t                  mru;
        size_t                  mtu;

        int                     npfilter;
        pfilter_t *             pfilter;

        int                     nmfilter;
        mfilter_t *             mfilter;

        pktlist_t               pktlist;
        int                     qlen;

        int                     fd;
        struct event            rd_ev;
        struct event            wr_ev;
        uint8_t *               sendbuf;

        bool                    (*send)(channel_t *, packet_t *);
        bool                    (*recv)(packet_t *);

        int                     tick;

        struct pidfh            *pfh;

        int                     refcnt;
        LIST_ENTRY(channel)     next;
};

/* network protocol type filter */
struct pfilter {
        uint16_t        start;
        uint16_t        end;
};

/* multicast address filter */
struct mfilter {
        uint8_t         start[ETHER_ADDR_LEN];
        uint8_t         end[ETHER_ADDR_LEN];
};

/* packet data buffer */
struct packet {
        channel_t *             chan;   /* source channel */
        uint8_t *               dst;    /* dest address */
        uint8_t *               src;    /* source address */
        uint8_t *               type;   /* protocol type */
        uint8_t *               ptr;    /* data pointer */
        size_t                  len;    /* data length */
        int                     refcnt; /* reference count */
        extlist_t               extlist;/* extension headers */
        uint8_t                 buf[0]; /* data starts here */
};

/* extension header */
struct exthdr {
        STAILQ_ENTRY(exthdr)    next;
        uint8_t *               ptr;
        uint8_t                 len;
};

/* packet header */
struct pkthdr {
        STAILQ_ENTRY(pkthdr)    next;
        packet_t *              data;
};

/* global variables */
extern const char *     control_path;
extern const char *     service_name;
extern const char *     interface_name;
extern bdaddr_t         local_bdaddr;
extern bdaddr_t         remote_bdaddr;
extern uint16_t         l2cap_psm;
extern int              l2cap_mode;
extern uint16_t         service_class;
extern int              server_limit;

/*
 * Bluetooth addresses are stored the other way around than
 * Ethernet addresses even though they are of the same family
 */
static inline void
b2eaddr(void *dst, bdaddr_t *src)
{
        uint8_t *d = dst;
        int i;

        for (i = 0; i < ETHER_ADDR_LEN; i++)
                d[i] = src->b[ETHER_ADDR_LEN - i - 1];
}

#define log_err(fmt, args...)           syslog(LOG_ERR, fmt , ##args)
#define log_info(fmt, args...)          syslog(LOG_INFO, fmt , ##args)
#define log_notice(fmt, args...)        syslog(LOG_NOTICE, fmt , ##args)
#define log_debug(fmt, args...)         syslog(LOG_DEBUG, "%s: " fmt, __func__ , ##args)

/* bnep.c */
bool            bnep_send(channel_t *, packet_t *);
bool            bnep_recv(packet_t *);
void            bnep_send_control(channel_t *, unsigned, ...);

/* channel.c */
void            channel_init(void);
channel_t *     channel_alloc(void);
bool            channel_open(channel_t *, int);
void            channel_close(channel_t *);
void            channel_free(channel_t *);
void            channel_timeout(channel_t *, int);
void            channel_put(channel_t *, packet_t *);

/* client.c */
void            client_init(void);

/* packet.c */
packet_t *      packet_alloc(channel_t *);
void            packet_free(packet_t *);
void            packet_adj(packet_t *, size_t);
pkthdr_t *      pkthdr_alloc(packet_t *);
void            pkthdr_free(pkthdr_t *);

/* server.c */
void            server_init(void);
void            server_update(int);

/* tap.c */
void            tap_init(void);