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/*
 *  This file contains the Flask hook function implementations for Xen.
 *
 *  Author:  George Coker, <gscoker@alpha.ncsc.mil>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License version 2,
 *      as published by the Free Software Foundation.
 */

#include <xen/init.h>
#include <xen/lib.h>
#include <xen/sched.h>
#include <xen/paging.h>
#include <xen/xmalloc.h>
#include <xsm/xsm.h>
#include <xen/spinlock.h>
#include <xen/cpumask.h>
#include <xen/errno.h>
#include <xen/guest_access.h>
#include <xen/xenoprof.h>
#include <asm/msi.h>
#include <public/xen.h>
#include <public/physdev.h>
#include <public/platform.h>

#include <public/xsm/flask_op.h>

#include <avc.h>
#include <avc_ss.h>
#include <objsec.h>
#include <conditional.h>

struct xsm_operations *original_ops = NULL;

static int domain_has_perm(struct domain *dom1, struct domain *dom2, 
                           u16 class, u32 perms)
{
    struct domain_security_struct *dsec1, *dsec2;
    struct avc_audit_data ad;
    AVC_AUDIT_DATA_INIT(&ad, NONE);
    ad.sdom = dom1;
    ad.tdom = dom2;

    dsec1 = dom1->ssid;
    dsec2 = dom2->ssid;

    return avc_has_perm(dsec1->sid, dsec2->sid, class, perms, &ad);
}

static int domain_has_evtchn(struct domain *d, struct evtchn *chn, u32 perms)
{
    struct domain_security_struct *dsec;
    struct evtchn_security_struct *esec;

    dsec = d->ssid;
    esec = chn->ssid;

    return avc_has_perm(dsec->sid, esec->sid, SECCLASS_EVENT, perms, NULL);
}

static int domain_has_xen(struct domain *d, u32 perms)
{
    struct domain_security_struct *dsec;
    dsec = d->ssid;

    return avc_has_perm(dsec->sid, SECINITSID_XEN, SECCLASS_XEN, perms, NULL);
}

static int get_irq_sid(int irq, u32 *sid, struct avc_audit_data *ad)
{
    struct irq_desc *desc = irq_to_desc(irq);
    if ( irq >= nr_irqs || irq < 0 )
        return -EINVAL;
    if ( irq < nr_irqs_gsi ) {
        if (ad) {
            AVC_AUDIT_DATA_INIT(ad, IRQ);
            ad->irq = irq;
        }
        return security_irq_sid(irq, sid);
    }
    if ( desc->msi_desc ) {
        struct pci_dev *dev = desc->msi_desc->dev;
        u32 sbdf = (dev->seg << 16) | (dev->bus << 8) | dev->devfn;
        if (ad) {
            AVC_AUDIT_DATA_INIT(ad, DEV);
            ad->device = sbdf;
        }
        return security_device_sid(sbdf, sid);
    }
    if (ad) {
        AVC_AUDIT_DATA_INIT(ad, IRQ);
        ad->irq = irq;
    }
    /* HPET or IOMMU IRQ, should not be seen by domains */
    *sid = SECINITSID_UNLABELED;
    return 0;
}

static int flask_domain_alloc_security(struct domain *d)
{
    struct domain_security_struct *dsec;

    dsec = xmalloc(struct domain_security_struct);

    if ( !dsec )
        return -ENOMEM;

    memset(dsec, 0, sizeof(struct domain_security_struct));

    dsec->create_sid = SECSID_NULL;
    switch ( d->domain_id )
    {
    case DOMID_IDLE:
        dsec->sid = SECINITSID_XEN;
        dsec->create_sid = SECINITSID_DOM0;
        break;
    case DOMID_XEN:
        dsec->sid = SECINITSID_DOMXEN;
        break;
    case DOMID_IO:
        dsec->sid = SECINITSID_DOMIO;
        break;
    default:
        dsec->sid = SECINITSID_UNLABELED;
    }

    d->ssid = dsec;

    return 0;
}

static void flask_domain_free_security(struct domain *d)
{
    struct domain_security_struct *dsec = d->ssid;

    if ( !dsec )
        return;

    d->ssid = NULL;
    xfree(dsec);
}

static int flask_evtchn_unbound(struct domain *d1, struct evtchn *chn, 
                                domid_t id2)
{
    u32 newsid;
    int rc;
    domid_t id;
    struct domain *d2;
    struct domain_security_struct *dsec, *dsec1, *dsec2;
    struct evtchn_security_struct *esec;

    dsec = current->domain->ssid;
    dsec1 = d1->ssid;
    esec = chn->ssid;

    if ( id2 == DOMID_SELF )
        id = current->domain->domain_id;
    else
        id = id2;

    d2 = get_domain_by_id(id);
    if ( d2 == NULL )
        return -EPERM;

    dsec2 = d2->ssid;
    rc = security_transition_sid(dsec1->sid, dsec2->sid, SECCLASS_EVENT, 
                                 &newsid);
    if ( rc )
        goto out;

    rc = avc_has_perm(dsec->sid, newsid, SECCLASS_EVENT, EVENT__CREATE, NULL);
    if ( rc )
        goto out;

    rc = avc_has_perm(newsid, dsec2->sid, SECCLASS_EVENT, EVENT__BIND, NULL);
    if ( rc )
        goto out;
    else
        esec->sid = newsid;

 out:
    put_domain(d2);
    return rc;
}

static int flask_evtchn_interdomain(struct domain *d1, struct evtchn *chn1, 
                                    struct domain *d2, struct evtchn *chn2)
{
    u32 newsid;
    int rc;
    struct domain_security_struct *dsec, *dsec1, *dsec2;
    struct evtchn_security_struct *esec1, *esec2;
    struct avc_audit_data ad;
    AVC_AUDIT_DATA_INIT(&ad, NONE);
    ad.sdom = d1;
    ad.tdom = d2;

    dsec = current->domain->ssid;
    dsec1 = d1->ssid;
    dsec2 = d2->ssid;

    esec1 = chn1->ssid;
    esec2 = chn2->ssid;

    rc = security_transition_sid(dsec1->sid, dsec2->sid, 
                                 SECCLASS_EVENT, &newsid);
    if ( rc )
    {
        printk("%s: security_transition_sid failed, rc=%d (domain=%d)\n",
               __FUNCTION__, -rc, d2->domain_id);
        return rc;
    }

    rc = avc_has_perm(dsec->sid, newsid, SECCLASS_EVENT, EVENT__CREATE, &ad);
    if ( rc )
        return rc;

    rc = avc_has_perm(newsid, dsec2->sid, SECCLASS_EVENT, EVENT__BIND, &ad);
    if ( rc )
        return rc;

    rc = avc_has_perm(esec2->sid, dsec1->sid, SECCLASS_EVENT, EVENT__BIND, &ad);
    if ( rc )
        return rc;

    esec1->sid = newsid;

    return rc;
}

static void flask_evtchn_close_post(struct evtchn *chn)
{
    struct evtchn_security_struct *esec;
    esec = chn->ssid;

    esec->sid = SECINITSID_UNLABELED;
}

static int flask_evtchn_send(struct domain *d, struct evtchn *chn)
{
    int rc;

    switch ( chn->state )
    {
    case ECS_INTERDOMAIN:
        rc = domain_has_evtchn(d, chn, EVENT__SEND);
        break;
    case ECS_IPI:
    case ECS_UNBOUND:
        rc = 0;
        break;
    default:
        rc = -EPERM;
    }

    return rc;
}

static int flask_evtchn_status(struct domain *d, struct evtchn *chn)
{
    return domain_has_evtchn(d, chn, EVENT__STATUS);
}

static int flask_evtchn_reset(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_EVENT, EVENT__RESET);
}

static int flask_alloc_security_evtchn(struct evtchn *chn)
{
    struct evtchn_security_struct *esec;

    esec = xmalloc(struct evtchn_security_struct);

    if ( !esec )
        return -ENOMEM;

    memset(esec, 0, sizeof(struct evtchn_security_struct));

    esec->sid = SECINITSID_UNLABELED;

    chn->ssid = esec;

    return 0;    
}

static void flask_free_security_evtchn(struct evtchn *chn)
{
    struct evtchn_security_struct *esec;

    if ( !chn )
        return;

    esec = chn->ssid;

    if ( !esec )
        return;

    chn->ssid = NULL;
    xfree(esec);
}

static char *flask_show_security_evtchn(struct domain *d, const struct evtchn *chn)
{
    struct evtchn_security_struct *esec;
    int irq;
    u32 sid = 0;
    char *ctx;
    u32 ctx_len;

    switch ( chn->state )
    {
    case ECS_UNBOUND:
    case ECS_INTERDOMAIN:
        esec = chn->ssid;
        if ( esec )
            sid = esec->sid;
        break;
    case ECS_PIRQ:
        irq = domain_pirq_to_irq(d, chn->u.pirq.irq);
        if (irq && get_irq_sid(irq, &sid, NULL))
            return NULL;
        break;
    }
    if ( !sid )
        return NULL;
    if (security_sid_to_context(sid, &ctx, &ctx_len))
        return NULL;
    return ctx;
}

static int flask_grant_mapref(struct domain *d1, struct domain *d2, 
                              uint32_t flags)
{
    u32 perms = GRANT__MAP_READ;

    if ( !(flags & GNTMAP_readonly) )
        perms |= GRANT__MAP_WRITE;

    return domain_has_perm(d1, d2, SECCLASS_GRANT, perms);
}

static int flask_grant_unmapref(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_GRANT, GRANT__UNMAP);
}

static int flask_grant_setup(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_GRANT, GRANT__SETUP);
}

static int flask_grant_transfer(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_GRANT, GRANT__TRANSFER);
}

static int flask_grant_copy(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_GRANT, GRANT__COPY);
}

static int flask_grant_query_size(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_GRANT, GRANT__QUERY);
}

static int flask_get_pod_target(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__GETPODTARGET);
}

static int flask_set_pod_target(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__SETPODTARGET);
}

static int flask_memory_adjust_reservation(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_MMU, MMU__ADJUST);
}

static int flask_memory_stat_reservation(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_MMU, MMU__STAT);
}

static int flask_memory_pin_page(struct domain *d1, struct domain *d2,
                                 struct page_info *page)
{
    return domain_has_perm(d1, d2, SECCLASS_MMU, MMU__PINPAGE);
}

static int flask_console_io(struct domain *d, int cmd)
{
    u32 perm;

    switch ( cmd )
    {
    case CONSOLEIO_read:
        perm = XEN__READCONSOLE;
        break;
    case CONSOLEIO_write:
        perm = XEN__WRITECONSOLE;
        break;
    default:
        return -EPERM;
    }

    return domain_has_xen(d, perm);
}

static int flask_profile(struct domain *d, int op)
{
    u32 perm;

    switch ( op )
    {
    case XENOPROF_init:
    case XENOPROF_enable_virq:
    case XENOPROF_disable_virq:
    case XENOPROF_get_buffer:
        perm = XEN__NONPRIVPROFILE;
        break;
    case XENOPROF_reset_active_list:
    case XENOPROF_reset_passive_list:
    case XENOPROF_set_active:
    case XENOPROF_set_passive:
    case XENOPROF_reserve_counters:
    case XENOPROF_counter:
    case XENOPROF_setup_events:
    case XENOPROF_start:
    case XENOPROF_stop:
    case XENOPROF_release_counters:
    case XENOPROF_shutdown:
        perm = XEN__PRIVPROFILE;
        break;
    default:
        return -EPERM;
    }

    return domain_has_xen(d, perm);
}

static int flask_kexec(void)
{
    return domain_has_xen(current->domain, XEN__KEXEC);
}

static int flask_schedop_shutdown(struct domain *d1, struct domain *d2)
{
    return domain_has_perm(d1, d2, SECCLASS_DOMAIN, DOMAIN__SHUTDOWN);
}

static void flask_security_domaininfo(struct domain *d, 
                                      struct xen_domctl_getdomaininfo *info)
{
    struct domain_security_struct *dsec;

    dsec = d->ssid;
    info->ssidref = dsec->sid;
}

static int flask_setvcpucontext(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, 
                           DOMAIN__SETVCPUCONTEXT);
}

static int flask_pausedomain(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__PAUSE);
}

static int flask_unpausedomain(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__UNPAUSE);
}

static int flask_resumedomain(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__RESUME);
}

static int flask_domain_create(struct domain *d, u32 ssidref)
{
    int rc;
    struct domain_security_struct *dsec1;
    struct domain_security_struct *dsec2;

    dsec1 = current->domain->ssid;

    if ( dsec1->create_sid == SECSID_NULL ) 
        dsec1->create_sid = ssidref;

    rc = avc_has_perm(dsec1->sid, dsec1->create_sid, SECCLASS_DOMAIN, 
                      DOMAIN__CREATE, NULL);
    if ( rc )
    {
        dsec1->create_sid = SECSID_NULL;
        return rc;
    }

    dsec2 = d->ssid;
    dsec2->sid = dsec1->create_sid;

    dsec1->create_sid = SECSID_NULL;
    dsec2->create_sid = SECSID_NULL;

    return rc;
}

static int flask_max_vcpus(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, 
                           DOMAIN__MAX_VCPUS);
}

static int flask_destroydomain(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, 
                           DOMAIN__DESTROY);
}

static int flask_vcpuaffinity(int cmd, struct domain *d)
{
    u32 perm;

    switch ( cmd )
    {
    case XEN_DOMCTL_setvcpuaffinity:
        perm = DOMAIN__SETVCPUAFFINITY;
        break;
    case XEN_DOMCTL_getvcpuaffinity:
        perm = DOMAIN__GETVCPUAFFINITY;
        break;
    default:
        return -EPERM;
    }

    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, perm );
}

static int flask_scheduler(struct domain *d)
{
    int rc = 0;

    rc = domain_has_xen(current->domain, XEN__SCHEDULER);
    if ( rc )
        return rc;

    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, 
                           DOMAIN__SCHEDULER);
}

static int flask_getdomaininfo(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN,
                           DOMAIN__GETDOMAININFO);
}

static int flask_getvcpucontext(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, 
                           DOMAIN__GETVCPUCONTEXT);
}

static int flask_getvcpuinfo(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN,
                           DOMAIN__GETVCPUINFO);
}

static int flask_domain_settime(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__SETTIME);
}

static int flask_set_target(struct domain *d, struct domain *e)
{
    return domain_has_perm(d, e, SECCLASS_DOMAIN, DOMAIN__SET_TARGET);
}

static int flask_domctl(struct domain *d, int cmd)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__SET_MISC_INFO);
}

static int flask_set_virq_handler(struct domain *d, uint32_t virq)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN, DOMAIN__SET_VIRQ_HANDLER);
}

static int flask_tbufcontrol(void)
{
    return domain_has_xen(current->domain, XEN__TBUFCONTROL);
}

static int flask_readconsole(uint32_t clear)
{
    u32 perms = XEN__READCONSOLE;

    if ( clear )
        perms |= XEN__CLEARCONSOLE;

    return domain_has_xen(current->domain, perms);
}

static int flask_sched_id(void)
{
    return domain_has_xen(current->domain, XEN__SCHEDULER);
}

static int flask_setdomainmaxmem(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN,
                           DOMAIN__SETDOMAINMAXMEM);
}

static int flask_setdomainhandle(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN,
                           DOMAIN__SETDOMAINHANDLE);
}

static int flask_setdebugging(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_DOMAIN,
                           DOMAIN__SETDEBUGGING);
}

static int flask_debug_keys(void)
{
    return domain_has_xen(current->domain, XEN__DEBUG);
}

static int flask_getcpuinfo(void)
{
    return domain_has_xen(current->domain, XEN__GETCPUINFO);
}

static int flask_availheap(void)
{
    return domain_has_xen(current->domain, XEN__HEAP);
}

static int flask_get_pmstat(void)
{
    return domain_has_xen(current->domain, XEN__PM_OP);
}

static int flask_setpminfo(void)
{
    return domain_has_xen(current->domain, XEN__PM_OP);
}

static int flask_pm_op(void)
{
    return domain_has_xen(current->domain, XEN__PM_OP);
}

static int flask_do_mca(void)
{
    return domain_has_xen(current->domain, XEN__MCA_OP);
}

static inline u32 resource_to_perm(uint8_t access)
{
    if ( access )
        return RESOURCE__ADD;
    else
        return RESOURCE__REMOVE;
}

static char *flask_show_irq_sid (int irq)
{
    u32 sid, ctx_len;
    char *ctx;
    int rc = get_irq_sid(irq, &sid, NULL);
    if ( rc )
        return NULL;

    if (security_sid_to_context(sid, &ctx, &ctx_len))
        return NULL;

    return ctx;
}

static int flask_map_domain_pirq (struct domain *d, int irq, void *data)
{
    u32 sid;
    int rc = -EPERM;
    struct msi_info *msi = data;

    struct domain_security_struct *ssec, *tsec;
    struct avc_audit_data ad;

    rc = domain_has_perm(current->domain, d, SECCLASS_RESOURCE, RESOURCE__ADD);

    if ( rc )
        return rc;

    if ( irq >= nr_irqs_gsi && msi ) {
        u32 machine_bdf = (msi->seg << 16) | (msi->bus << 8) | msi->devfn;
        AVC_AUDIT_DATA_INIT(&ad, DEV);
        ad.device = machine_bdf;
        rc = security_device_sid(machine_bdf, &sid);
    } else {
        rc = get_irq_sid(irq, &sid, &ad);
    }
    if ( rc )
        return rc;

    ssec = current->domain->ssid;
    tsec = d->ssid;

    rc = avc_has_perm(ssec->sid, sid, SECCLASS_RESOURCE, RESOURCE__ADD_IRQ, &ad);
    if ( rc )
        return rc;

    rc = avc_has_perm(tsec->sid, sid, SECCLASS_RESOURCE, RESOURCE__USE, &ad);
    return rc;
}

static int flask_irq_permission (struct domain *d, int irq, uint8_t access)
{
    u32 perm;
    u32 rsid;
    int rc = -EPERM;

    struct domain_security_struct *ssec, *tsec;
    struct avc_audit_data ad;

    rc = domain_has_perm(current->domain, d, SECCLASS_RESOURCE,
                         resource_to_perm(access));

    if ( rc )
        return rc;

    if ( access )
        perm = RESOURCE__ADD_IRQ;
    else
        perm = RESOURCE__REMOVE_IRQ;

    ssec = current->domain->ssid;
    tsec = d->ssid;

    rc = get_irq_sid(irq, &rsid, &ad);
    if ( rc )
        return rc;

    rc = avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, perm, &ad);
    if ( rc )
        return rc;

    if ( access )
        rc = avc_has_perm(tsec->sid, rsid, SECCLASS_RESOURCE, 
                            RESOURCE__USE, &ad);
    return rc;
}

struct iomem_has_perm_data {
    struct domain_security_struct *ssec, *tsec;
    u32 perm;
};

static int _iomem_has_perm(void *v, u32 sid, unsigned long start, unsigned long end)
{
    struct iomem_has_perm_data *data = v;
    struct avc_audit_data ad;
    int rc = -EPERM;

    AVC_AUDIT_DATA_INIT(&ad, RANGE);
    ad.range.start = start;
    ad.range.end = end;

    rc = avc_has_perm(data->ssec->sid, sid, SECCLASS_RESOURCE, data->perm, &ad);

    if ( rc )
        return rc;

    return avc_has_perm(data->tsec->sid, sid, SECCLASS_RESOURCE, RESOURCE__USE, &ad);
}

static int flask_iomem_permission(struct domain *d, uint64_t start, uint64_t end, uint8_t access)
{
    struct iomem_has_perm_data data;
    int rc;

    rc = domain_has_perm(current->domain, d, SECCLASS_RESOURCE,
                         resource_to_perm(access));
    if ( rc )
        return rc;

    if ( access )
        data.perm = RESOURCE__ADD_IOMEM;
    else
        data.perm = RESOURCE__REMOVE_IOMEM;

    data.ssec = current->domain->ssid;
    data.tsec = d->ssid;

    return security_iterate_iomem_sids(start, end, _iomem_has_perm, &data);
}

static int flask_pci_config_permission(struct domain *d, uint32_t machine_bdf, uint16_t start, uint16_t end, uint8_t access)
{
    u32 rsid;
    int rc = -EPERM;
    struct avc_audit_data ad;
    struct domain_security_struct *ssec;
    u32 perm = RESOURCE__USE;

    rc = security_device_sid(machine_bdf, &rsid);
    if ( rc )
        return rc;

    /* Writes to the BARs count as setup */
    if ( access && (end >= 0x10 && start < 0x28) )
        perm = RESOURCE__SETUP;

    AVC_AUDIT_DATA_INIT(&ad, DEV);
    ad.device = (unsigned long) machine_bdf;
    ssec = d->ssid;
    return avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, perm, &ad);

}

static int flask_resource_plug_core(void)
{
    struct domain_security_struct *ssec;

    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, SECINITSID_DOMXEN, SECCLASS_RESOURCE, RESOURCE__PLUG, NULL);
}

static int flask_resource_unplug_core(void)
{
    struct domain_security_struct *ssec;

    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, SECINITSID_DOMXEN, SECCLASS_RESOURCE, RESOURCE__UNPLUG, NULL);
}

static int flask_resource_use_core(void)
{
    struct domain_security_struct *ssec;

    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, SECINITSID_DOMXEN, SECCLASS_RESOURCE, RESOURCE__USE, NULL);
}

static int flask_resource_plug_pci(uint32_t machine_bdf)
{
    u32 rsid;
    int rc = -EPERM;
    struct avc_audit_data ad;
    struct domain_security_struct *ssec;

    rc = security_device_sid(machine_bdf, &rsid);
    if ( rc )
        return rc;

    AVC_AUDIT_DATA_INIT(&ad, DEV);
    ad.device = (unsigned long) machine_bdf;
    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, RESOURCE__PLUG, &ad);
}

static int flask_resource_unplug_pci(uint32_t machine_bdf)
{
    u32 rsid;
    int rc = -EPERM;
    struct avc_audit_data ad;
    struct domain_security_struct *ssec;

    rc = security_device_sid(machine_bdf, &rsid);
    if ( rc )
        return rc;

    AVC_AUDIT_DATA_INIT(&ad, DEV);
    ad.device = (unsigned long) machine_bdf;
    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, RESOURCE__UNPLUG, &ad);
}

static int flask_resource_setup_pci(uint32_t machine_bdf)
{
    u32 rsid;
    int rc = -EPERM;
    struct avc_audit_data ad;
    struct domain_security_struct *ssec;

    rc = security_device_sid(machine_bdf, &rsid);
    if ( rc )
        return rc;

    AVC_AUDIT_DATA_INIT(&ad, DEV);
    ad.device = (unsigned long) machine_bdf;
    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, RESOURCE__SETUP, &ad);
}

static int flask_resource_setup_gsi(int gsi)
{
    u32 rsid;
    int rc = -EPERM;
    struct avc_audit_data ad;
    struct domain_security_struct *ssec;

    rc = get_irq_sid(gsi, &rsid, &ad);
    if ( rc )
        return rc;

    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, rsid, SECCLASS_RESOURCE, RESOURCE__SETUP, &ad);
}

static int flask_resource_setup_misc(void)
{
    struct domain_security_struct *ssec;

    ssec = current->domain->ssid;
    return avc_has_perm(ssec->sid, SECINITSID_XEN, SECCLASS_RESOURCE, RESOURCE__SETUP, NULL);
}

static inline int flask_page_offline(uint32_t cmd)
{
    switch (cmd) {
    case sysctl_page_offline:
        return flask_resource_unplug_core();
    case sysctl_page_online:
        return flask_resource_plug_core();
    case sysctl_query_page_offline:
        return flask_resource_use_core();
    default:
        return -EPERM;
    }
}

static inline int flask_lockprof(void)
{
    return domain_has_xen(current->domain, XEN__LOCKPROF);
}

static inline int flask_cpupool_op(void)
{
    return domain_has_xen(current->domain, XEN__CPUPOOL_OP);
}

static inline int flask_sched_op(void)
{
    return domain_has_xen(current->domain, XEN__SCHED_OP);
}

static int flask_perfcontrol(void)
{
    return domain_has_xen(current->domain, XEN__PERFCONTROL);
}

#ifdef CONFIG_X86
static int flask_shadow_control(struct domain *d, uint32_t op)
{
    u32 perm;

    switch ( op )
    {
    case XEN_DOMCTL_SHADOW_OP_OFF:
        perm = SHADOW__DISABLE;
        break;
    case XEN_DOMCTL_SHADOW_OP_ENABLE:
    case XEN_DOMCTL_SHADOW_OP_ENABLE_TEST:
    case XEN_DOMCTL_SHADOW_OP_ENABLE_TRANSLATE:
    case XEN_DOMCTL_SHADOW_OP_GET_ALLOCATION:
    case XEN_DOMCTL_SHADOW_OP_SET_ALLOCATION:
        perm = SHADOW__ENABLE;
        break;
    case XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY:
    case XEN_DOMCTL_SHADOW_OP_PEEK:
    case XEN_DOMCTL_SHADOW_OP_CLEAN:
        perm = SHADOW__LOGDIRTY;
        break;
    default:
        return -EPERM;
    }

    return domain_has_perm(current->domain, d, SECCLASS_SHADOW, perm);
}

struct ioport_has_perm_data {
    struct domain_security_struct *ssec, *tsec;
    u32 perm;
};

static int _ioport_has_perm(void *v, u32 sid, unsigned long start, unsigned long end)
{
    struct ioport_has_perm_data *data = v;
    struct avc_audit_data ad;
    int rc;

    AVC_AUDIT_DATA_INIT(&ad, RANGE);
    ad.range.start = start;
    ad.range.end = end;

    rc = avc_has_perm(data->ssec->sid, sid, SECCLASS_RESOURCE, data->perm, &ad);

    if ( rc )
        return rc;

    return avc_has_perm(data->tsec->sid, sid, SECCLASS_RESOURCE, RESOURCE__USE, &ad);
}


static int flask_ioport_permission(struct domain *d, uint32_t start, uint32_t end, uint8_t access)
{
    int rc;
    struct ioport_has_perm_data data;

    rc = domain_has_perm(current->domain, d, SECCLASS_RESOURCE,
                         resource_to_perm(access));

    if ( rc )
        return rc;

    if ( access )
        data.perm = RESOURCE__ADD_IOPORT;
    else
        data.perm = RESOURCE__REMOVE_IOPORT;

    data.ssec = current->domain->ssid;
    data.tsec = d->ssid;

    return security_iterate_ioport_sids(start, end, _ioport_has_perm, &data);
}

static int flask_getpageframeinfo(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_MMU, MMU__PAGEINFO);
}

static int flask_getmemlist(struct domain *d)
{
    return domain_has_perm(current->domain, d, SECCLASS_MMU, MMU__PAGELIST);


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