xnu-7195.101.1.tar.gz

[apple/xnu.git] / osfmk / mach / port.h

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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/*
 * @OSF_COPYRIGHT@
 */
/*
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 * NOTICE: This file was modified by McAfee Research in 2004 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */
/*
 */
/*
 *	File:	mach/port.h
 *
 *	Definition of a Mach port
 *
 *	Mach ports are the endpoints to Mach-implemented communications
 *	channels (usually uni-directional message queues, but other types
 *	also exist).
 *
 *	Unique collections of these endpoints are maintained for each
 *	Mach task.  Each Mach port in the task's collection is given a
 *	[task-local] name to identify it - and the the various "rights"
 *	held by the task for that specific endpoint.
 *
 *	This header defines the types used to identify these Mach ports
 *	and the various rights associated with them.  For more info see:
 *
 *	<mach/mach_port.h> - manipulation of port rights in a given space
 *	<mach/message.h> - message queue [and port right passing] mechanism
 *
 */

#ifndef _MACH_PORT_H_
#define _MACH_PORT_H_

#include <sys/cdefs.h>
#include <stdint.h>
#include <mach/boolean.h>
#include <mach/machine/vm_types.h>

/*
 *	mach_port_name_t - the local identity for a Mach port
 *
 *	The name is Mach port namespace specific.  It is used to
 *	identify the rights held for that port by the task whose
 *	namespace is implied [or specifically provided].
 *
 *	Use of this type usually implies just a name - no rights.
 *	See mach_port_t for a type that implies a "named right."
 *
 */

typedef natural_t mach_port_name_t;
typedef mach_port_name_t *mach_port_name_array_t;

#ifdef  KERNEL

/*
 *	mach_port_t - a named port right
 *
 *	In the kernel, "rights" are represented [named] by pointers to
 *	the ipc port object in question. There is no port namespace for the
 *	rights to be collected.
 *
 *	Actually, there is namespace for the kernel task.  But most kernel
 *	code - including, but not limited to, Mach IPC code - lives in the
 *	limbo between the current user-level task and the "next" task. Very
 *	little of the kernel code runs in full kernel task context.  So very
 *	little of it gets to use the kernel task's port name space.
 *
 *	Because of this implementation approach, all in-kernel rights for
 *	a given port coalesce [have the same name/pointer].  The actual
 *	references are counted in the port itself.  It is up to the kernel
 *	code in question to "just remember" how many [and what type of]
 *	rights it holds and handle them appropriately.
 *
 */

#ifndef MACH_KERNEL_PRIVATE
/*
 *	For kernel code that resides outside of Mach proper, we opaque the
 *	port structure definition.
 */
struct ipc_port;

#endif  /* MACH_KERNEL_PRIVATE */

typedef struct ipc_port         *ipc_port_t;

#define IPC_PORT_NULL           ((ipc_port_t) NULL)
#define IPC_PORT_DEAD           ((ipc_port_t)~0UL)
#define IPC_PORT_VALID(port)    ipc_port_valid(port)

static inline boolean_t
ipc_port_valid(ipc_port_t port)
{
	return port != IPC_PORT_DEAD && port;
}

typedef ipc_port_t              mach_port_t;

/*
 * Since the 32-bit and 64-bit representations of ~0 are different,
 * explicitly handle MACH_PORT_DEAD
 */

#define CAST_MACH_PORT_TO_NAME(x) ((mach_port_name_t)(uintptr_t)(x))
#define CAST_MACH_NAME_TO_PORT(x) ((x) == MACH_PORT_DEAD ? (mach_port_t)IPC_PORT_DEAD : (mach_port_t)(uintptr_t)(x))

#else   /* KERNEL */

/*
 *	mach_port_t - a named port right
 *
 *	In user-space, "rights" are represented by the name of the
 *	right in the Mach port namespace.  Even so, this type is
 *	presented as a unique one to more clearly denote the presence
 *	of a right coming along with the name.
 *
 *	Often, various rights for a port held in a single name space
 *	will coalesce and are, therefore, be identified by a single name
 *	[this is the case for send and receive rights].  But not
 *	always [send-once rights currently get a unique name for
 *	each right].
 *
 */

#include <sys/_types.h>
#include <sys/_types/_mach_port_t.h>

#endif  /* KERNEL */

typedef mach_port_t                     *mach_port_array_t;

/*
 *  MACH_PORT_NULL is a legal value that can be carried in messages.
 *  It indicates the absence of any port or port rights.  (A port
 *  argument keeps the message from being "simple", even if the
 *  value is MACH_PORT_NULL.)  The value MACH_PORT_DEAD is also a legal
 *  value that can be carried in messages.  It indicates
 *  that a port right was present, but it died.
 */

#if defined(XNU_KERNEL_PRIVATE) && defined(__cplusplus)
#define MACH_PORT_NULL          NULL
#else
#define MACH_PORT_NULL          0  /* intentional loose typing */
#endif
#define MACH_PORT_DEAD          ((mach_port_name_t) ~0)
#define MACH_PORT_VALID(name)                           \
	        (((name) != MACH_PORT_NULL) &&          \
	         ((name) != MACH_PORT_DEAD))


/*
 *	For kernel-selected [assigned] port names, the name is
 *	comprised of two parts: a generation number and an index.
 *	This approach keeps the exact same name from being generated
 *	and reused too quickly [to catch right/reference counting bugs].
 *	The dividing line between the constituent parts is exposed so
 *	that efficient "mach_port_name_t to data structure pointer"
 *	conversion implementation can be made.  But it is possible
 *	for user-level code to assign their own names to Mach ports.
 *	These are not required to participate in this algorithm.  So
 *	care should be taken before "assuming" this model.
 *
 */

#ifndef NO_PORT_GEN

#define MACH_PORT_INDEX(name)           ((name) >> 8)
#define MACH_PORT_GEN(name)             (((name) & 0xff) << 24)
#define MACH_PORT_MAKE(index, gen)      \
	        (((index) << 8) | (gen) >> 24)

#else   /* NO_PORT_GEN */

#define MACH_PORT_INDEX(name)           (name)
#define MACH_PORT_GEN(name)             (0)
#define MACH_PORT_MAKE(index, gen)      (index)

#endif  /* NO_PORT_GEN */


/*
 *  These are the different rights a task may have for a port.
 *  The MACH_PORT_RIGHT_* definitions are used as arguments
 *  to mach_port_allocate, mach_port_get_refs, etc, to specify
 *  a particular right to act upon.  The mach_port_names and
 *  mach_port_type calls return bitmasks using the MACH_PORT_TYPE_*
 *  definitions.  This is because a single name may denote
 *  multiple rights.
 */

typedef natural_t mach_port_right_t;

#define MACH_PORT_RIGHT_SEND            ((mach_port_right_t) 0)
#define MACH_PORT_RIGHT_RECEIVE         ((mach_port_right_t) 1)
#define MACH_PORT_RIGHT_SEND_ONCE       ((mach_port_right_t) 2)
#define MACH_PORT_RIGHT_PORT_SET        ((mach_port_right_t) 3)
#define MACH_PORT_RIGHT_DEAD_NAME       ((mach_port_right_t) 4)
#define MACH_PORT_RIGHT_LABELH          ((mach_port_right_t) 5) /* obsolete right */
#define MACH_PORT_RIGHT_NUMBER          ((mach_port_right_t) 6) /* right not implemented */

#ifdef MACH_KERNEL_PRIVATE
#define MACH_PORT_RIGHT_VALID_TRANSLATE(right) \
	((right) >= MACH_PORT_RIGHT_SEND && (right) <= MACH_PORT_RIGHT_DEAD_NAME)
#endif

typedef natural_t mach_port_type_t;
typedef mach_port_type_t *mach_port_type_array_t;

#define MACH_PORT_TYPE(right)                                           \
	        ((mach_port_type_t)(((mach_port_type_t) 1)              \
	        << ((right) + ((mach_port_right_t) 16))))
#define MACH_PORT_TYPE_NONE         ((mach_port_type_t) 0L)
#define MACH_PORT_TYPE_SEND         MACH_PORT_TYPE(MACH_PORT_RIGHT_SEND)
#define MACH_PORT_TYPE_RECEIVE      MACH_PORT_TYPE(MACH_PORT_RIGHT_RECEIVE)
#define MACH_PORT_TYPE_SEND_ONCE    MACH_PORT_TYPE(MACH_PORT_RIGHT_SEND_ONCE)
#define MACH_PORT_TYPE_PORT_SET     MACH_PORT_TYPE(MACH_PORT_RIGHT_PORT_SET)
#define MACH_PORT_TYPE_DEAD_NAME    MACH_PORT_TYPE(MACH_PORT_RIGHT_DEAD_NAME)
#define MACH_PORT_TYPE_LABELH       MACH_PORT_TYPE(MACH_PORT_RIGHT_LABELH) /* obsolete */

#ifdef MACH_KERNEL_PRIVATE
/* Holder used to have a receive right - remembered to filter exceptions */
#define MACH_PORT_TYPE_EX_RECEIVE   MACH_PORT_TYPE_LABELH
#endif

/* Convenient combinations. */

#define MACH_PORT_TYPE_SEND_RECEIVE                                     \
	        (MACH_PORT_TYPE_SEND|MACH_PORT_TYPE_RECEIVE)
#define MACH_PORT_TYPE_SEND_RIGHTS                                      \
	        (MACH_PORT_TYPE_SEND|MACH_PORT_TYPE_SEND_ONCE)
#define MACH_PORT_TYPE_PORT_RIGHTS                                      \
	        (MACH_PORT_TYPE_SEND_RIGHTS|MACH_PORT_TYPE_RECEIVE)
#define MACH_PORT_TYPE_PORT_OR_DEAD                                     \
	        (MACH_PORT_TYPE_PORT_RIGHTS|MACH_PORT_TYPE_DEAD_NAME)
#define MACH_PORT_TYPE_ALL_RIGHTS                                       \
	        (MACH_PORT_TYPE_PORT_OR_DEAD|MACH_PORT_TYPE_PORT_SET)

/* Dummy type bits that mach_port_type/mach_port_names can return. */

#define MACH_PORT_TYPE_DNREQUEST                0x80000000
#define MACH_PORT_TYPE_SPREQUEST                0x40000000
#define MACH_PORT_TYPE_SPREQUEST_DELAYED        0x20000000

/* User-references for capabilities. */

typedef natural_t mach_port_urefs_t;
typedef integer_t mach_port_delta_t;                    /* change in urefs */

/* Attributes of ports.  (See mach_port_get_receive_status.) */

typedef natural_t mach_port_seqno_t;            /* sequence number */
typedef natural_t mach_port_mscount_t;          /* make-send count */
typedef natural_t mach_port_msgcount_t;         /* number of msgs */
typedef natural_t mach_port_rights_t;           /* number of rights */

/*
 *	Are there outstanding send rights for a given port?
 */
#define MACH_PORT_SRIGHTS_NONE          0               /* no srights */
#define MACH_PORT_SRIGHTS_PRESENT       1               /* srights */
typedef unsigned int mach_port_srights_t;       /* status of send rights */

typedef struct mach_port_status {
	mach_port_rights_t      mps_pset;       /* count of containing port sets */
	mach_port_seqno_t       mps_seqno;      /* sequence number */
	mach_port_mscount_t     mps_mscount;    /* make-send count */
	mach_port_msgcount_t    mps_qlimit;     /* queue limit */
	mach_port_msgcount_t    mps_msgcount;   /* number in the queue */
	mach_port_rights_t      mps_sorights;   /* how many send-once rights */
	boolean_t               mps_srights;    /* do send rights exist? */
	boolean_t               mps_pdrequest;  /* port-deleted requested? */
	boolean_t               mps_nsrequest;  /* no-senders requested? */
	natural_t               mps_flags;              /* port flags */
} mach_port_status_t;

/* System-wide values for setting queue limits on a port */
#define MACH_PORT_QLIMIT_ZERO           (0)
#define MACH_PORT_QLIMIT_BASIC          (5)
#define MACH_PORT_QLIMIT_SMALL          (16)
#define MACH_PORT_QLIMIT_LARGE          (1024)
#define MACH_PORT_QLIMIT_KERNEL         (65534)
#define MACH_PORT_QLIMIT_MIN            MACH_PORT_QLIMIT_ZERO
#define MACH_PORT_QLIMIT_DEFAULT        MACH_PORT_QLIMIT_BASIC
#define MACH_PORT_QLIMIT_MAX            MACH_PORT_QLIMIT_LARGE

typedef struct mach_port_limits {
	mach_port_msgcount_t    mpl_qlimit;     /* number of msgs */
} mach_port_limits_t;

/* Possible values for mps_flags (part of mach_port_status_t) */
#define MACH_PORT_STATUS_FLAG_TEMPOWNER         0x01
#define MACH_PORT_STATUS_FLAG_GUARDED           0x02
#define MACH_PORT_STATUS_FLAG_STRICT_GUARD      0x04
#define MACH_PORT_STATUS_FLAG_IMP_DONATION      0x08
#define MACH_PORT_STATUS_FLAG_REVIVE            0x10
#define MACH_PORT_STATUS_FLAG_TASKPTR           0x20
#define MACH_PORT_STATUS_FLAG_GUARD_IMMOVABLE_RECEIVE 0x40
#define MACH_PORT_STATUS_FLAG_NO_GRANT          0x80

typedef struct mach_port_info_ext {
	mach_port_status_t      mpie_status;
	mach_port_msgcount_t    mpie_boost_cnt;
	uint32_t                reserved[6];
} mach_port_info_ext_t;

typedef integer_t *mach_port_info_t;            /* varying array of natural_t */

/* Flavors for mach_port_get/set_attributes() */
typedef int     mach_port_flavor_t;
#define MACH_PORT_LIMITS_INFO           1       /* uses mach_port_limits_t */
#define MACH_PORT_RECEIVE_STATUS        2       /* uses mach_port_status_t */
#define MACH_PORT_DNREQUESTS_SIZE       3       /* info is int */
#define MACH_PORT_TEMPOWNER             4       /* indicates receive right will be reassigned to another task */
#define MACH_PORT_IMPORTANCE_RECEIVER   5       /* indicates recieve right accepts priority donation */
#define MACH_PORT_DENAP_RECEIVER        6       /* indicates receive right accepts de-nap donation */
#define MACH_PORT_INFO_EXT              7       /* uses mach_port_info_ext_t */

#define MACH_PORT_LIMITS_INFO_COUNT     ((natural_t) \
	(sizeof(mach_port_limits_t)/sizeof(natural_t)))
#define MACH_PORT_RECEIVE_STATUS_COUNT  ((natural_t) \
	(sizeof(mach_port_status_t)/sizeof(natural_t)))
#define MACH_PORT_DNREQUESTS_SIZE_COUNT 1
#define MACH_PORT_INFO_EXT_COUNT        ((natural_t) \
	(sizeof(mach_port_info_ext_t)/sizeof(natural_t)))
/*
 * Structure used to pass information about port allocation requests.
 * Must be padded to 64-bits total length.
 */
typedef struct mach_port_qos {
	unsigned int            name:1;         /* name given */
	unsigned int            prealloc:1;     /* prealloced message */
	boolean_t               pad1:30;
	natural_t               len;
} mach_port_qos_t;

/* Mach Port Guarding definitions */

/*
 * Flags for mach_port_options (used for
 * invocation of mach_port_construct).
 * Indicates attributes to be set for the newly
 * allocated port.
 */
#define MPO_CONTEXT_AS_GUARD    0x01    /* Add guard to the port */
#define MPO_QLIMIT              0x02    /* Set qlimit for the port msg queue */
#define MPO_TEMPOWNER           0x04    /* Set the tempowner bit of the port */
#define MPO_IMPORTANCE_RECEIVER 0x08    /* Mark the port as importance receiver */
#define MPO_INSERT_SEND_RIGHT   0x10    /* Insert a send right for the port */
#define MPO_STRICT              0x20    /* Apply strict guarding for port */
#define MPO_DENAP_RECEIVER      0x40    /* Mark the port as App de-nap receiver */
#define MPO_IMMOVABLE_RECEIVE   0x80    /* Mark the port as immovable; protected by the guard context */
#define MPO_FILTER_MSG          0x100   /* Allow message filtering */
#define MPO_TG_BLOCK_TRACKING   0x200   /* Track blocking relationship for thread group during sync IPC */

/*
 * Structure to define optional attributes for a newly
 * constructed port.
 */
typedef struct mach_port_options {
	uint32_t                flags;          /* Flags defining attributes for port */
	mach_port_limits_t      mpl;            /* Message queue limit for port */
	union {
		uint64_t                reserved[2];           /* Reserved */
		mach_port_name_t        work_interval_port;    /* Work interval port */
	};
}mach_port_options_t;

typedef mach_port_options_t *mach_port_options_ptr_t;

/*
 * EXC_GUARD represents a guard violation for both
 * mach ports and file descriptors. GUARD_TYPE_ is used
 * to differentiate among them.
 */
#define GUARD_TYPE_MACH_PORT    0x1

/* Reasons for exception for a guarded mach port */
enum mach_port_guard_exception_codes {
	kGUARD_EXC_DESTROY                       = 1u << 0,
	kGUARD_EXC_MOD_REFS                      = 1u << 1,
	kGUARD_EXC_SET_CONTEXT               = 1u << 2,
	kGUARD_EXC_UNGUARDED                 = 1u << 3,
	kGUARD_EXC_INCORRECT_GUARD           = 1u << 4,
	kGUARD_EXC_IMMOVABLE                 = 1u << 5,
	kGUARD_EXC_STRICT_REPLY              = 1u << 6,
	kGUARD_EXC_MSG_FILTERED              = 1u << 7,
	/* start of [optionally] non-fatal guards */
	kGUARD_EXC_INVALID_RIGHT         = 1u << 8,
	kGUARD_EXC_INVALID_NAME          = 1u << 9,
	kGUARD_EXC_INVALID_VALUE         = 1u << 10,
	kGUARD_EXC_INVALID_ARGUMENT      = 1u << 11,
	kGUARD_EXC_RIGHT_EXISTS          = 1u << 12,
	kGUARD_EXC_KERN_NO_SPACE         = 1u << 13,
	kGUARD_EXC_KERN_FAILURE          = 1u << 14,
	kGUARD_EXC_KERN_RESOURCE         = 1u << 15,
	kGUARD_EXC_SEND_INVALID_REPLY    = 1u << 16,
	kGUARD_EXC_SEND_INVALID_VOUCHER  = 1u << 17,
	kGUARD_EXC_SEND_INVALID_RIGHT    = 1u << 18,
	kGUARD_EXC_RCV_INVALID_NAME      = 1u << 19,
	kGUARD_EXC_RCV_GUARDED_DESC      = 1u << 20, /* should never be fatal; for development only */
	kGUARD_EXC_MOD_REFS_NON_FATAL    = 1u << 21,
	kGUARD_EXC_IMMOVABLE_NON_FATAL   = 1u << 22,
};

#define MAX_FATAL_kGUARD_EXC_CODE (1u << 7)

/*
 * Mach port guard flags.
 */
#define MPG_FLAGS_NONE                             (0x00ull)

/*
 * These flags are used as bits in the subcode of kGUARD_EXC_STRICT_REPLY exceptions.
 */
#define MPG_FLAGS_STRICT_REPLY_INVALID_REPLY_DISP  (0x01ull << 56)
#define MPG_FLAGS_STRICT_REPLY_INVALID_REPLY_PORT  (0x02ull << 56)
#define MPG_FLAGS_STRICT_REPLY_INVALID_VOUCHER     (0x04ull << 56)
#define MPG_FLAGS_STRICT_REPLY_NO_BANK_ATTR        (0x08ull << 56)
#define MPG_FLAGS_STRICT_REPLY_MISMATCHED_PERSONA  (0x10ull << 56)
#define MPG_FLAGS_STRICT_REPLY_MASK                (0xffull << 56)

/*
 * These flags are used as bits in the subcode of kGUARD_EXC_MOD_REFS exceptions.
 */
#define MPG_FLAGS_MOD_REFS_PINNED_DEALLOC          (0x01ull << 56)

/*
 * These flags are used as bits in the subcode of kGUARD_EXC_IMMOVABLE exceptions.
 */
#define MPG_FLAGS_IMMOVABLE_PINNED                 (0x01ull << 56)

/*
 * Flags for mach_port_guard_with_flags. These flags extend
 * the attributes associated with a guarded port.
 */
#define MPG_STRICT              0x01    /* Apply strict guarding for a port */
#define MPG_IMMOVABLE_RECEIVE   0x02    /* Receive right cannot be moved out of the space */

#if     !__DARWIN_UNIX03 && !defined(_NO_PORT_T_FROM_MACH)
/*
 *  Mach 3.0 renamed everything to have mach_ in front of it.
 *  These types and macros are provided for backward compatibility
 *	but are deprecated.
 */
typedef mach_port_t             port_t;
typedef mach_port_name_t        port_name_t;
typedef mach_port_name_t        *port_name_array_t;

#define PORT_NULL               ((port_t) 0)
#define PORT_DEAD               ((port_t) ~0)
#define PORT_VALID(name) \
	        ((port_t)(name) != PORT_NULL && (port_t)(name) != PORT_DEAD)

#endif  /* !__DARWIN_UNIX03 && !_NO_PORT_T_FROM_MACH */

#endif  /* _MACH_PORT_H_ */