common/io/bl.c

	bl.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Blacklist special file
 */

#include <sys/types.h>
#include <sys/conf.h>
#include <sys/stat.h>
#include <sys/modctl.h>
#include <sys/kmem.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/open.h>
#include <sys/policy.h>
#include <sys/fm/protocol.h>
#include <sys/bl.h>

static dev_info_t *bl_dip;  /* private copy of devinfo pointer */

static int
bl_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_ATTACH:
        break;
    case DDI_RESUME:
        return (DDI_SUCCESS);
    default:
        return (DDI_FAILURE);
    }

    if (ddi_create_minor_node(dip, ddi_get_name(dip), S_IFCHR,
        ddi_get_instance(dip), DDI_PSEUDO, 0) != DDI_SUCCESS)
        return (DDI_FAILURE);

    bl_dip = dip;
    return (DDI_SUCCESS);
}

/*ARGSUSED*/
static int
bl_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_DETACH:
        break;
    case DDI_SUSPEND:
        return (DDI_SUCCESS);
    default:
        return (DDI_FAILURE);
    }

    ddi_remove_minor_node(bl_dip, NULL);
    return (DDI_SUCCESS);
}

/*ARGSUSED*/
static int
bl_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
    int rc = DDI_SUCCESS;

    switch (infocmd) {
    case DDI_INFO_DEVT2DEVINFO:
        *result = bl_dip;
        break;

    case DDI_INFO_DEVT2INSTANCE:
        *result = (void *)(uintptr_t)getminor((dev_t)arg);
        break;

    default:
        *result = NULL;
        rc = DDI_FAILURE;
    }

    return (rc);
}

/*ARGSUSED*/
static int
bl_open(dev_t *devp, int flag, int otyp, struct cred *credp)
{
    if (otyp != OTYP_CHR)
        return (EINVAL);

    if (secpolicy_blacklist(credp) != 0)
        return (EPERM);

    return (0);
}

/*ARGSUSED*/
static int
bl_ioctl(dev_t dev, int cmd, intptr_t data, int flag, cred_t *cred, int *rvalp)
{
    bl_req_t blr;
    nvlist_t *fmri;
    const char *scheme;
    char class[128];
    char *buf;
    int err;

#ifdef _SYSCALL32
    if (get_udatamodel() != DATAMODEL_NATIVE) {
        bl_req32_t blr32;

        if (copyin((void *)data, &blr32, sizeof (bl_req32_t)) != 0)
            return (EFAULT);

        blr.bl_fmri = (caddr_t)(uintptr_t)blr32.bl_fmri;
        blr.bl_fmrisz = blr32.bl_fmrisz;

        blr.bl_class = (caddr_t)(uintptr_t)blr32.bl_class;
    } else
#endif
    {
        if (copyin((void *)data, &blr, sizeof (bl_req_t)) != 0)
            return (EFAULT);
    }

    if (blr.bl_fmri == NULL || blr.bl_fmrisz > BL_FMRI_MAX_BUFSIZE ||
        blr.bl_class == NULL)
        return (EINVAL);

    if (copyinstr(blr.bl_class, class, sizeof (class), NULL) != 0)
        return (EFAULT);

    buf = kmem_zalloc(blr.bl_fmrisz, KM_SLEEP);
    if (copyin(blr.bl_fmri, buf, blr.bl_fmrisz) != 0) {
        kmem_free(buf, blr.bl_fmrisz);
        return (EFAULT);
    }

    err = nvlist_unpack(buf, blr.bl_fmrisz, &fmri, KM_SLEEP);
    kmem_free(buf, blr.bl_fmrisz);
    if (err != 0)
        return (err);

    if (nvlist_lookup_string(fmri, FM_FMRI_SCHEME, (char **)&scheme) != 0) {
        nvlist_free(fmri);
        return (EINVAL);
    }

    switch (cmd) {
    case BLIOC_INSERT:
    case BLIOC_DELETE:
        err = blacklist(cmd, scheme, fmri, class);
        break;
    default:
        err = ENOTSUP;
    }

    nvlist_free(fmri);
    return (err);

}

static struct cb_ops bl_cb_ops = {
    bl_open,        /* open */
    nulldev,        /* close */
    nodev,          /* strategy */
    nodev,          /* print */
    nodev,          /* dump */
    nodev,          /* read */
    nodev,          /* write */
    bl_ioctl,       /* ioctl */
    nodev,          /* devmap */
    nodev,          /* mmap */
    nodev,          /* segmap */
    nochpoll,       /* poll */
    ddi_prop_op,        /* cb_prop_op */
    0,          /* streamtab  */
    D_NEW | D_MP | D_64BIT  /* Driver compatibility flag */
};

static struct dev_ops bl_ops = {
    DEVO_REV,       /* devo_rev */
    0,          /* devo_refcnt  */
    bl_getinfo,     /* devo_getinfo */
    nulldev,        /* devo_identify */
    nulldev,        /* devo_probe */
    bl_attach,      /* devo_attach */
    bl_detach,      /* devo_detach */
    nodev,          /* devo_reset */
    &bl_cb_ops,     /* devo_cb_ops */
    (struct bus_ops *)0,    /* devo_bus_ops */
    NULL            /* devo_power */
};

static struct modldrv modldrv = {
    &mod_driverops, "blacklist driver %I%", &bl_ops,
};

static struct modlinkage modlinkage = {
    MODREV_1, &modldrv, NULL
};

int
_init(void)
{
    return (mod_install(&modlinkage));
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}

int
_fini(void)
{
    return (mod_remove(&modlinkage));
}