/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
 *    redistribution must be conditioned upon including a substantially
 *    similar Disclaimer requirement for further binary redistribution.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#include <sys/param.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/jail.h>

#include <sys/socket.h>

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

#include <netinet/in.h>

#include "if_wtapvar.h"
#include "if_wtapioctl.h"
#include "if_medium.h"
#include "wtap_hal/hal.h"

/* WTAP PLUGINS */
#include "plugins/visibility.h"

MALLOC_DEFINE(M_WTAP, "wtap", "wtap wireless simulator");
MALLOC_DEFINE(M_WTAP_PACKET, "wtap packet", "wtap wireless simulator packet");
MALLOC_DEFINE(M_WTAP_RXBUF, "wtap rxbuf",
    "wtap wireless simulator receive buffer");
MALLOC_DEFINE(M_WTAP_PLUGIN, "wtap plugin", "wtap wireless simulator plugin");

static struct wtap_hal          *hal;

/* Function prototypes */
static d_ioctl_t        wtap_ioctl;

static struct cdev *sdev;
static struct cdevsw wtap_cdevsw = {
        .d_version =    D_VERSION,
        .d_flags =      0,
        .d_ioctl =      wtap_ioctl,
        .d_name =       "wtapctl",
};

int
wtap_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
    int fflag, struct thread *td)
{
        int error = 0;

        CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));

        switch(cmd) {
        case WTAPIOCTLCRT:
                if(new_wtap(hal, *(int *)data))
                        error = EINVAL;
                break;
        case WTAPIOCTLDEL:
                if(free_wtap(hal, *(int *)data))
                        error = EINVAL;
                break;
        default:
                DWTAP_PRINTF("Unknown WTAP IOCTL\n");
                error = EINVAL;
        }

        CURVNET_RESTORE();
        return error;
}

/* The function called at load/unload. */
static int
event_handler(module_t module, int event, void *arg) 
{
        struct visibility_plugin *plugin;
        int e = 0; /* Error, 0 for normal return status */

        switch (event) {
        case MOD_LOAD:
                sdev = make_dev(&wtap_cdevsw,0,UID_ROOT,
                    GID_WHEEL,0600,(const char *)"wtapctl");
                hal = (struct wtap_hal *)malloc(sizeof(struct wtap_hal),
                    M_WTAP, M_NOWAIT | M_ZERO);

                init_hal(hal);

                /* Setting up a simple plugin */
                plugin = (struct visibility_plugin *)malloc
                    (sizeof(struct visibility_plugin), M_WTAP_PLUGIN,
                    M_NOWAIT | M_ZERO);
                plugin->base.wp_hal  = hal;
                plugin->base.init = visibility_init;
                plugin->base.deinit = visibility_deinit;
                plugin->base.work = visibility_work;
                register_plugin(hal, (struct wtap_plugin *)plugin);

                printf("Loaded wtap wireless simulator\n");
                break;
        case MOD_UNLOAD:
                destroy_dev(sdev);
                deregister_plugin(hal);
                deinit_hal(hal);
                free(hal, M_WTAP);
                printf("Unloading wtap wireless simulator\n");
                break;
        default:
                e = EOPNOTSUPP; /* Error, Operation Not Supported */
                break;
        }

        return(e);
}

/* The second argument of DECLARE_MODULE. */
static moduledata_t wtap_conf = {
        "wtap",         /* module name */
        event_handler,  /* event handler */
        NULL            /* extra data */
};

DECLARE_MODULE(wtap, wtap_conf, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(wtap, wlan, 1, 1, 1);     /* 802.11 media layer */