/*
 * Copyright (c) 2000-2001 Boris Popov
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 * $FreeBSD: src/sys/netsmb/smb_dev.c,v 1.2.2.1 2001/05/22 08:32:33 bp Exp $
 */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/file.h>           /* Must come after sys/malloc.h */
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/thread2.h>
#include <sys/devfs.h>
#include <net/if.h>

#include "smb.h"
#include "smb_conn.h"
#include "smb_subr.h"
#include "smb_dev.h"

#define SMB_GETDEV(dev)         ((struct smb_dev*)(dev)->si_drv1)
#define SMB_CHECKMINOR(dev)     do { \
                                    sdp = SMB_GETDEV(dev); \
                                    if (sdp == NULL) return ENXIO; \
                                } while(0)

static d_open_t  nsmb_dev_open;
static d_close_t nsmb_dev_close;
static d_read_t  nsmb_dev_read;
static d_write_t nsmb_dev_write;
static d_ioctl_t nsmb_dev_ioctl;
static d_clone_t nsmbclone;
DEVFS_DEFINE_CLONE_BITMAP(nsmb);

MODULE_VERSION(netsmb, NSMB_VERSION);

#define SI_NAMED        0

static int smb_version = NSMB_VERSION;


SYSCTL_DECL(_net_smb);
SYSCTL_INT(_net_smb, OID_AUTO, version, CTLFLAG_RD, &smb_version, 0, "");

static MALLOC_DEFINE(M_NSMBDEV, "NETSMBDEV", "NET/SMB device");


/*
int smb_dev_queue(struct smb_dev *ndp, struct smb_rq *rqp, int prio);
*/

static struct dev_ops nsmb_ops = {
        { NSMB_NAME, 0, 0 },
        .d_open =       nsmb_dev_open,
        .d_close =      nsmb_dev_close,
        .d_read =       nsmb_dev_read,
        .d_write =      nsmb_dev_write,
        .d_ioctl =      nsmb_dev_ioctl,
};


static int
nsmb_dev_open(struct dev_open_args *ap)
{
        cdev_t dev = ap->a_head.a_dev;
        struct smb_dev *sdp;

        sdp = SMB_GETDEV(dev);
        if (sdp && (sdp->sd_flags & NSMBFL_OPEN))
                return EBUSY;
        if (sdp == NULL) {
                sdp = kmalloc(sizeof(*sdp), M_NSMBDEV, M_WAITOK);
                dev->si_drv1 = (void*)sdp;
        }
        /*
         * XXX: this is just crazy - make a device for an already passed
         * device...  someone should take care of it.
         */
#if 0
        if ((dev->si_flags & SI_NAMED) == 0) {
                make_dev(&nsmb_ops, minor(dev),
                        ap->a_cred->cr_uid, ap->a_cred->cr_gid,
                        0700, NSMB_NAME"%d", lminor(dev));
        }
#endif
        bzero(sdp, sizeof(*sdp));
/*
        STAILQ_INIT(&sdp->sd_rqlist);
        STAILQ_INIT(&sdp->sd_rplist);
        bzero(&sdp->sd_pollinfo, sizeof(struct kqinfo));
*/
        crit_enter();
        sdp->sd_level = -1;
        sdp->sd_flags |= NSMBFL_OPEN;
        crit_exit();
        return 0;
}

static int
nsmb_dev_close(struct dev_close_args *ap)
{
        cdev_t dev = ap->a_head.a_dev;
        struct smb_dev *sdp;
        struct smb_vc *vcp;
        struct smb_share *ssp;
        struct smb_cred scred;

        SMB_CHECKMINOR(dev);
        crit_enter();
        if ((sdp->sd_flags & NSMBFL_OPEN) == 0) {
                crit_exit();
                return EBADF;
        }
        smb_makescred(&scred, curthread, NULL);
        ssp = sdp->sd_share;
        if (ssp != NULL)
                smb_share_rele(ssp, &scred);
        vcp = sdp->sd_vc;
        if (vcp != NULL)
                smb_vc_rele(vcp, &scred);
/*
        smb_flushq(&sdp->sd_rqlist);
        smb_flushq(&sdp->sd_rplist);
*/
        dev->si_drv1 = NULL;
        kfree(sdp, M_NSMBDEV);
        crit_exit();
        devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(nsmb), dev->si_uminor);
        destroy_dev(dev);
        return 0;
}


static int
nsmb_dev_ioctl(struct dev_ioctl_args *ap)
{
        cdev_t dev = ap->a_head.a_dev;
        caddr_t data = ap->a_data;
        struct smb_dev *sdp;
        struct smb_vc *vcp;
        struct smb_share *ssp;
        struct smb_cred scred;
        int error = 0;

        SMB_CHECKMINOR(dev);
        if ((sdp->sd_flags & NSMBFL_OPEN) == 0)
                return EBADF;

        smb_makescred(&scred, NULL, ap->a_cred);
        switch (ap->a_cmd) {
            case SMBIOC_OPENSESSION:
                if (sdp->sd_vc)
                        return EISCONN;
                error = smb_usr_opensession((struct smbioc_ossn*)data,
                    &scred, &vcp);
                if (error)
                        break;
                sdp->sd_vc = vcp;
                smb_vc_unlock(vcp, 0);
                sdp->sd_level = SMBL_VC;
                break;
            case SMBIOC_OPENSHARE:
                if (sdp->sd_share)
                        return EISCONN;
                if (sdp->sd_vc == NULL)
                        return ENOTCONN;
                error = smb_usr_openshare(sdp->sd_vc,
                    (struct smbioc_oshare*)data, &scred, &ssp);
                if (error)
                        break;
                sdp->sd_share = ssp;
                smb_share_unlock(ssp, 0);
                sdp->sd_level = SMBL_SHARE;
                break;
            case SMBIOC_REQUEST:
                if (sdp->sd_share == NULL)
                        return ENOTCONN;
                error = smb_usr_simplerequest(sdp->sd_share,
                    (struct smbioc_rq*)data, &scred);
                break;
            case SMBIOC_T2RQ:
                if (sdp->sd_share == NULL)
                        return ENOTCONN;
                error = smb_usr_t2request(sdp->sd_share,
                    (struct smbioc_t2rq*)data, &scred);
                break;
            case SMBIOC_SETFLAGS: {
                struct smbioc_flags *fl = (struct smbioc_flags*)data;
                int on;
        
                if (fl->ioc_level == SMBL_VC) {
                        if (fl->ioc_mask & SMBV_PERMANENT) {
                                on = fl->ioc_flags & SMBV_PERMANENT;
                                if ((vcp = sdp->sd_vc) == NULL)
                                        return ENOTCONN;
                                error = smb_vc_get(vcp, LK_EXCLUSIVE, &scred);
                                if (error)
                                        break;
                                if (on && (vcp->obj.co_flags & SMBV_PERMANENT) == 0) {
                                        vcp->obj.co_flags |= SMBV_PERMANENT;
                                        smb_vc_ref(vcp);
                                } else if (!on && (vcp->obj.co_flags & SMBV_PERMANENT)) {
                                        vcp->obj.co_flags &= ~SMBV_PERMANENT;
                                        smb_vc_rele(vcp, &scred);
                                }
                                smb_vc_put(vcp, &scred);
                        } else
                                error = EINVAL;
                } else if (fl->ioc_level == SMBL_SHARE) {
                        if (fl->ioc_mask & SMBS_PERMANENT) {
                                on = fl->ioc_flags & SMBS_PERMANENT;
                                if ((ssp = sdp->sd_share) == NULL)
                                        return ENOTCONN;
                                error = smb_share_get(ssp, LK_EXCLUSIVE, &scred);
                                if (error)
                                        break;
                                if (on && (ssp->obj.co_flags & SMBS_PERMANENT) == 0) {
                                        ssp->obj.co_flags |= SMBS_PERMANENT;
                                        smb_share_ref(ssp);
                                } else if (!on && (ssp->obj.co_flags & SMBS_PERMANENT)) {
                                        ssp->obj.co_flags &= ~SMBS_PERMANENT;
                                        smb_share_rele(ssp, &scred);
                                }
                                smb_share_put(ssp, &scred);
                        } else
                                error = EINVAL;
                        break;
                } else
                        error = EINVAL;
                break;
            }
            case SMBIOC_LOOKUP:
                if (sdp->sd_vc || sdp->sd_share)
                        return EISCONN;
                vcp = NULL;
                ssp = NULL;
                error = smb_usr_lookup((struct smbioc_lookup*)data, &scred, &vcp, &ssp);
                if (error)
                        break;
                if (vcp) {
                        sdp->sd_vc = vcp;
                        smb_vc_unlock(vcp, 0);
                        sdp->sd_level = SMBL_VC;
                }
                if (ssp) {
                        sdp->sd_share = ssp;
                        smb_share_unlock(ssp, 0);
                        sdp->sd_level = SMBL_SHARE;
                }
                break;
            case SMBIOC_READ: case SMBIOC_WRITE: {
                struct smbioc_rw *rwrq = (struct smbioc_rw*)data;
                struct uio auio;
                struct iovec iov;
        
                if ((ssp = sdp->sd_share) == NULL)
                        return ENOTCONN;
                iov.iov_base = rwrq->ioc_base;
                iov.iov_len = rwrq->ioc_cnt;
                auio.uio_iov = &iov;
                auio.uio_iovcnt = 1;
                auio.uio_offset = rwrq->ioc_offset;
                auio.uio_resid = rwrq->ioc_cnt;
                auio.uio_segflg = UIO_USERSPACE;
                auio.uio_rw = (ap->a_cmd == SMBIOC_READ) ? UIO_READ : UIO_WRITE;
                auio.uio_td = curthread;
                if (ap->a_cmd == SMBIOC_READ)
                        error = smb_read(ssp, rwrq->ioc_fh, &auio, &scred);
                else
                        error = smb_write(ssp, rwrq->ioc_fh, &auio, &scred);
                rwrq->ioc_cnt -= auio.uio_resid;
                break;
            }
            default:
                error = ENODEV;
        }
        return error;
}

static int
nsmb_dev_read(struct dev_read_args *ap)
{
        return EACCES;
}

static int
nsmb_dev_write(struct dev_write_args *ap)
{
        return EACCES;
}

static int
nsmbclone(struct dev_clone_args *ap)
{
        int unit;

        unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(nsmb), 0);
        ap->a_dev = make_only_dev(&nsmb_ops, unit, 0, 0, 0600,
                                  NSMB_NAME"%d", unit);

        return 0;
}

static int
nsmb_dev_load(module_t mod, int cmd, void *arg)
{
        int error = 0;

        switch (cmd) {
            case MOD_LOAD:
                error = smb_sm_init();
                if (error)
                        break;
                error = smb_iod_init();
                if (error) {
                        smb_sm_done();
                        break;
                }
                make_autoclone_dev(&nsmb_ops, &DEVFS_CLONE_BITMAP(nsmb),
                        nsmbclone, 0, 0, 0700, NSMB_NAME);

                kprintf("netsmb_dev: loaded\n");
                break;
            case MOD_UNLOAD:
                smb_iod_done();
                error = smb_sm_done();
                error = 0;
                devfs_clone_handler_del(NSMB_NAME);
                dev_ops_remove_all(&nsmb_ops);
                devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(nsmb));
                kprintf("netsmb_dev: unloaded\n");
                break;
            default:
                error = EINVAL;
                break;
        }
        return error;
}

DEV_MODULE (dev_netsmb, nsmb_dev_load, 0);

int
smb_dev2share(int fd, int mode, struct smb_cred *scred,
        struct smb_share **sspp)
{
        struct file *fp;
        struct vnode *vp;
        struct smb_dev *sdp;
        struct smb_share *ssp;
        cdev_t dev;
        int error;

        KKASSERT(scred->scr_td->td_proc);

        fp = holdfp_fdp(scred->scr_td->td_proc->p_fd, fd, FREAD|FWRITE);
        if (fp == NULL)
                return EBADF;

        vp = (struct vnode*)fp->f_data;
        if (vp == NULL) {
                error = EBADF;
                goto done;
        }
        dev = vn_todev(vp);
        if (dev == NULL) {
                error = EBADF;
                goto done;
        }
        SMB_CHECKMINOR(dev);
        ssp = sdp->sd_share;
        if (ssp == NULL) {
                error = ENOTCONN;
                goto done;
        }
        error = smb_share_get(ssp, LK_EXCLUSIVE, scred);
        if (error == 0)
                *sspp = ssp;
done:
        fdrop(fp);
        return (error);
}