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/******************************************************************************
*policy_ops.c
*
* Copyright (C) 2005 IBM Corporation
*
* Author:
* Reiner Sailer <sailer@watson.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
* Process policy command requests from guest OS.
*
*/
#include <xen/config.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <public/policy_ops.h>
#include <xen/sched.h>
#include <xen/event.h>
#include <xen/trace.h>
#include <xen/console.h>
#include <asm/shadow.h>
#include <public/sched_ctl.h>
#include <acm/acm_hooks.h>
/* function prototypes defined in acm/acm_policy.c */
int acm_set_policy(void *buf, u16 buf_size, u16 policy);
int acm_get_policy(void *buf, u16 buf_size);
int acm_dump_statistics(void *buf, u16 buf_size);
typedef enum policyoperation {
POLICY, /* access to policy interface (early drop) */
GETPOLICY, /* dump policy cache */
SETPOLICY, /* set policy cache (controls security) */
DUMPSTATS /* dump policy statistics */
} policyoperation_t;
int
acm_authorize_policyops(struct domain *d, policyoperation_t pops)
{
/* currently, all policy management functions are restricted to privileged domains,
* soon we will introduce finer-grained privileges for policy operations
*/
if (!IS_PRIV(d)) {
printk("%s: Policy management authorization denied ERROR!\n", __func__);
return ACM_ACCESS_DENIED;
}
return ACM_ACCESS_PERMITTED;
}
long do_policy_op(policy_op_t *u_policy_op)
{
long ret = 0;
policy_op_t curop, *op = &curop;
/* check here policy decision for policy commands */
/* for now allow DOM0 only, later indepedently */
if (acm_authorize_policyops(current->domain, POLICY))
return -EACCES;
if ( copy_from_user(op, u_policy_op, sizeof(*op)) )
return -EFAULT;
if ( op->interface_version != POLICY_INTERFACE_VERSION )
return -EACCES;
switch ( op->cmd )
{
case POLICY_SETPOLICY:
{
if (acm_authorize_policyops(current->domain, SETPOLICY))
return -EACCES;
printkd("%s: setting policy.\n", __func__);
ret = acm_set_policy(op->u.setpolicy.pushcache, op->u.setpolicy.pushcache_size, op->u.setpolicy.policy_type);
if (ret == ACM_OK)
ret = 0;
else
ret = -ESRCH;
}
break;
case POLICY_GETPOLICY:
{
if (acm_authorize_policyops(current->domain, GETPOLICY))
return -EACCES;
printkd("%s: getting policy.\n", __func__);
ret = acm_get_policy(op->u.getpolicy.pullcache, op->u.getpolicy.pullcache_size);
if (ret == ACM_OK)
ret = 0;
else
ret = -ESRCH;
}
break;
case POLICY_DUMPSTATS:
{
if (acm_authorize_policyops(current->domain, DUMPSTATS))
return -EACCES;
printkd("%s: dumping statistics.\n", __func__);
ret = acm_dump_statistics(op->u.dumpstats.pullcache, op->u.dumpstats.pullcache_size);
if (ret == ACM_OK)
ret = 0;
else
ret = -ESRCH;
}
break;
default:
ret = -ESRCH;
}
return ret;
}
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