/*      $NetBSD: bio.c,v 1.17 2020/12/19 01:12:21 thorpej Exp $ */
/*      $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $   */

/*
* Copyright (c) 2002 Niklas Hallqvist.  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.
*/

/* A device controller ioctl tunnelling device.  */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.17 2020/12/19 01:12:21 thorpej Exp $");

#include "opt_compat_netbsd.h"

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/event.h>
#include <sys/ioctl.h>
#include <sys/kmem.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/compat_stub.h>

#include <dev/biovar.h>
#include <dev/sysmon/sysmonvar.h>

#include "ioconf.h"

struct bio_mapping {
       LIST_ENTRY(bio_mapping) bm_link;
       device_t bm_dev;
       int (*bm_ioctl)(device_t, u_long, void *);
};

static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
static kmutex_t bio_lock;
static bool bio_lock_initialized = false;

static void     bio_initialize(void);
static int      bioclose(dev_t, int, int, struct lwp *);
static int      bioioctl(dev_t, u_long, void *, int, struct lwp *);
static int      bioopen(dev_t, int, int, struct lwp *);

static int      bio_delegate_ioctl(void *, u_long, void *);
static struct   bio_mapping *bio_lookup(char *);
static int      bio_validate(void *);

const struct cdevsw bio_cdevsw = {
       .d_open = bioopen,
       .d_close = bioclose,
       .d_read = noread,
       .d_write = nowrite,
       .d_ioctl = bioioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = D_OTHER | D_MPSAFE
};


static void
bio_initialize(void)
{
       if (bio_lock_initialized)
               return;

       mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM);
       bio_lock_initialized = true;
}

void
bioattach(int nunits)
{
       if (!bio_lock_initialized)
               bio_initialize();
}

static int
bioopen(dev_t dev, int flags, int mode, struct lwp *l)
{
       return 0;
}

static int
bioclose(dev_t dev, int flags, int mode, struct lwp *l)
{
       return 0;
}

static int
bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct  lwp *l)
{
       struct bio_locate *locate;
       struct bio_common *common;
       char name[16];
       int error;

       switch(cmd) {
       case BIOCLOCATE:
       case BIOCINQ:
       case BIOCDISK:
       case BIOCDISK_NOVOL:
       case BIOCVOL:
       case OBIOCDISK:
       case OBIOCVOL:
               error = kauth_authorize_device_passthru(l->l_cred, dev,
                   KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr);
               if (error)
                       return error;
               break;
       case BIOCBLINK:
       case BIOCSETSTATE:
       case BIOCVOLOPS:
               error = kauth_authorize_device_passthru(l->l_cred, dev,
                   KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr);
               if (error)
                       return error;
               break;
       case BIOCALARM: {
               struct bioc_alarm *alarm = (struct bioc_alarm *)addr;
               switch (alarm->ba_opcode) {
               case BIOC_SADISABLE:
               case BIOC_SAENABLE:
               case BIOC_SASILENCE:
               case BIOC_SATEST:
                       error = kauth_authorize_device_passthru(l->l_cred, dev,
                           KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr);
                       if (error)
                               return error;
                       break;
               case BIOC_GASTATUS:
                       error = kauth_authorize_device_passthru(l->l_cred, dev,
                           KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr);
                       if (error)
                               return error;
                       break;
               default:
                       return EINVAL;
               }
               break;
       }
       default:
               return ENOTTY;
       }

       switch (cmd) {
       case BIOCLOCATE:
               locate = addr;
               error = copyinstr(locate->bl_name, name, sizeof(name), NULL);
               if (error != 0)
                       return error;
               locate->bl_cookie = bio_lookup(name);
               if (locate->bl_cookie == NULL)
                       return ENOENT;
               break;

       default:
               common = addr;
               mutex_enter(&bio_lock);
               if (!bio_validate(common->bc_cookie)) {
                       mutex_exit(&bio_lock);
                       return ENOENT;
               }
               mutex_exit(&bio_lock);
               MODULE_HOOK_CALL(compat_bio_30_hook,
                   (common->bc_cookie, cmd, addr, bio_delegate_ioctl),
                   enosys(), error);
               if (error == ENOSYS)
                       error = bio_delegate_ioctl(common->bc_cookie, cmd,
                           addr);
               return error;
       }
       return 0;
}

int
bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *))
{
       struct bio_mapping *bm;

       if (!bio_lock_initialized)
               bio_initialize();

       bm = kmem_zalloc(sizeof(*bm), KM_SLEEP);
       bm->bm_dev = dev;
       bm->bm_ioctl = ioctl;
       mutex_enter(&bio_lock);
       LIST_INSERT_HEAD(&bios, bm, bm_link);
       mutex_exit(&bio_lock);
       return 0;
}

void
bio_unregister(device_t dev)
{
       struct bio_mapping *bm, *next;

       mutex_enter(&bio_lock);
       for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
               next = LIST_NEXT(bm, bm_link);

               if (dev == bm->bm_dev) {
                       LIST_REMOVE(bm, bm_link);
                       kmem_free(bm, sizeof(*bm));
               }
       }
       mutex_exit(&bio_lock);
}

static struct bio_mapping *
bio_lookup(char *name)
{
       struct bio_mapping *bm;

       mutex_enter(&bio_lock);
       LIST_FOREACH(bm, &bios, bm_link) {
               if (strcmp(name, device_xname(bm->bm_dev)) == 0) {
                       mutex_exit(&bio_lock);
                       return bm;
               }
       }
       mutex_exit(&bio_lock);
       return NULL;
}

static int
bio_validate(void *cookie)
{
       struct bio_mapping *bm;

       LIST_FOREACH(bm, &bios, bm_link)
               if (bm == cookie)
                       return 1;

       return 0;
}

static int
bio_delegate_ioctl(void *cookie, u_long cmd, void *addr)
{
       struct bio_mapping *bm = cookie;

       return bm->bm_ioctl(bm->bm_dev, cmd, addr);
}

void
bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd)
{
       switch (bd->bd_status) {
       case BIOC_SDONLINE:
               edata->value_cur = ENVSYS_DRIVE_ONLINE;
               edata->state = ENVSYS_SVALID;
               break;
       case BIOC_SDOFFLINE:
               edata->value_cur = ENVSYS_DRIVE_OFFLINE;
               edata->state = ENVSYS_SCRITICAL;
               break;
       default:
               edata->value_cur = ENVSYS_DRIVE_FAIL;
               edata->state = ENVSYS_SCRITICAL;
               break;
       }
}

void
bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv)
{
       switch (bv->bv_status) {
       case BIOC_SVOFFLINE:
               edata->value_cur = ENVSYS_DRIVE_OFFLINE;
               edata->state = ENVSYS_SCRITICAL;
               break;
       case BIOC_SVDEGRADED:
               edata->value_cur = ENVSYS_DRIVE_PFAIL;
               edata->state = ENVSYS_SCRITICAL;
               break;
       case BIOC_SVBUILDING:
               edata->value_cur = ENVSYS_DRIVE_BUILD;
               edata->state = ENVSYS_SVALID;
               break;
       case BIOC_SVMIGRATING:
               edata->value_cur = ENVSYS_DRIVE_MIGRATING;
               edata->state = ENVSYS_SVALID;
               break;
       case BIOC_SVCHECKING:
               edata->value_cur = ENVSYS_DRIVE_CHECK;
               edata->state = ENVSYS_SVALID;
               break;
       case BIOC_SVREBUILD:
               edata->value_cur = ENVSYS_DRIVE_REBUILD;
               edata->state = ENVSYS_SCRITICAL;
               break;
       case BIOC_SVSCRUB:
       case BIOC_SVONLINE:
               edata->value_cur = ENVSYS_DRIVE_ONLINE;
               edata->state = ENVSYS_SVALID;
               break;
       case BIOC_SVINVALID:
               /* FALLTHROUGH */
       default:
               edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */
               edata->state = ENVSYS_SINVALID;
               break;
       }
}

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