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linux/include/rdma/uverbs_ioctl.h
Gustavo A. R. Silva 155f04366e RDMA/uverbs: Avoid -Wflex-array-member-not-at-end warnings 
-Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
ready to enable it globally.

There are currently a couple of objects (`alloc_head` and `bundle`) in
`struct bundle_priv` that contain a couple of flexible structures:

struct bundle_priv {
        /* Must be first */
        struct bundle_alloc_head alloc_head;

	...

        /*
         * Must be last. bundle ends in a flex array which overlaps
         * internal_buffer.
         */
        struct uverbs_attr_bundle bundle;
        u64 internal_buffer[32];
};

So, in order to avoid ending up with a couple of flexible-array members
in the middle of a struct, we use the `struct_group_tagged()` helper to
separate the flexible array from the rest of the members in the flexible
structures:

struct uverbs_attr_bundle {
        struct_group_tagged(uverbs_attr_bundle_hdr, hdr,
		... the rest of the members
        );
        struct uverbs_attr attrs[];
};

With the change described above, we now declare objects of the type of
the tagged struct without embedding flexible arrays in the middle of
another struct:

struct bundle_priv {
        /* Must be first */
        struct bundle_alloc_head_hdr alloc_head;

        ...

        struct uverbs_attr_bundle_hdr bundle;
        u64 internal_buffer[32];
};

We also use `container_of()` whenever we need to retrieve a pointer
to the flexible structures.

Notice that the `bundle_size` computed in `uapi_compute_bundle_size()`
remains the same.

So, with these changes, fix the following warnings:

drivers/infiniband/core/uverbs_ioctl.c:45:34: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
   45 |         struct bundle_alloc_head alloc_head;
      |                                  ^~~~~~~~~~
drivers/infiniband/core/uverbs_ioctl.c:67:35: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
   67 |         struct uverbs_attr_bundle bundle;
      |                                   ^~~~~~

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/ZeIgeZ5Sb0IZTOyt@neat
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
2024-03-03 15:38:44 +02:00

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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
*/
#ifndef _UVERBS_IOCTL_
#define _UVERBS_IOCTL_
#include <rdma/uverbs_types.h>
#include <linux/uaccess.h>
#include <rdma/rdma_user_ioctl.h>
#include <rdma/ib_user_ioctl_verbs.h>
#include <rdma/ib_user_ioctl_cmds.h>
/*
* =======================================
* Verbs action specifications
* =======================================
*/
enum uverbs_attr_type {
UVERBS_ATTR_TYPE_NA,
UVERBS_ATTR_TYPE_PTR_IN,
UVERBS_ATTR_TYPE_PTR_OUT,
UVERBS_ATTR_TYPE_IDR,
UVERBS_ATTR_TYPE_FD,
UVERBS_ATTR_TYPE_RAW_FD,
UVERBS_ATTR_TYPE_ENUM_IN,
UVERBS_ATTR_TYPE_IDRS_ARRAY,
};
enum uverbs_obj_access {
UVERBS_ACCESS_READ,
UVERBS_ACCESS_WRITE,
UVERBS_ACCESS_NEW,
UVERBS_ACCESS_DESTROY
};
/* Specification of a single attribute inside the ioctl message */
/* good size 16 */
struct uverbs_attr_spec {
u8 type;
/*
* Support extending attributes by length. Allow the user to provide
* more bytes than ptr.len, but check that everything after is zero'd
* by the user.
*/
u8 zero_trailing:1;
/*
* Valid only for PTR_IN. Allocate and copy the data inside
* the parser
*/
u8 alloc_and_copy:1;
u8 mandatory:1;
/* True if this is from UVERBS_ATTR_UHW */
u8 is_udata:1;
union {
struct {
/* Current known size to kernel */
u16 len;
/* User isn't allowed to provide something < min_len */
u16 min_len;
} ptr;
struct {
/*
* higher bits mean the namespace and lower bits mean
* the type id within the namespace.
*/
u16 obj_type;
u8 access;
} obj;
struct {
u8 num_elems;
} enum_def;
} u;
/* This weird split lets us remove some padding */
union {
struct {
/*
* The enum attribute can select one of the attributes
* contained in the ids array. Currently only PTR_IN
* attributes are supported in the ids array.
*/
const struct uverbs_attr_spec *ids;
} enum_def;
struct {
/*
* higher bits mean the namespace and lower bits mean
* the type id within the namespace.
*/
u16 obj_type;
u16 min_len;
u16 max_len;
u8 access;
} objs_arr;
} u2;
};
/*
* Information about the API is loaded into a radix tree. For IOCTL we start
* with a tuple of:
* object_id, attr_id, method_id
*
* Which is a 48 bit value, with most of the bits guaranteed to be zero. Based
* on the current kernel support this is compressed into 16 bit key for the
* radix tree. Since this compression is entirely internal to the kernel the
* below limits can be revised if the kernel gains additional data.
*
* With 64 leafs per node this is a 3 level radix tree.
*
* The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
* the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
*
* This also encodes the tables for the write() and write() extended commands
* using the coding
* OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command #
* OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex #
* ie the WRITE path is treated as a special method type in the ioctl
* framework.
*/
enum uapi_radix_data {
UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
UVERBS_API_ATTR_KEY_BITS = 6,
UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS,
UVERBS_API_METHOD_KEY_BITS = 5,
UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
UVERBS_API_METHOD_KEY_NUM_CORE = 22,
UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT,
UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT,
UVERBS_API_METHOD_KEY_NUM_DRIVER =
(UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) -
UVERBS_API_METHOD_KEY_NUM_CORE,
UVERBS_API_METHOD_KEY_MASK = GENMASK(
UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
UVERBS_API_METHOD_KEY_SHIFT),
UVERBS_API_OBJ_KEY_BITS = 5,
UVERBS_API_OBJ_KEY_SHIFT =
UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
UVERBS_API_OBJ_KEY_NUM_CORE = 20,
UVERBS_API_OBJ_KEY_NUM_DRIVER =
(1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
/* This id guaranteed to not exist in the radix tree */
UVERBS_API_KEY_ERR = 0xFFFFFFFF,
};
static inline __attribute_const__ u32 uapi_key_obj(u32 id)
{
if (id & UVERBS_API_NS_FLAG) {
id &= ~UVERBS_API_NS_FLAG;
if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER)
return UVERBS_API_KEY_ERR;
id = id + UVERBS_API_OBJ_KEY_NUM_CORE;
} else {
if (id >= UVERBS_API_OBJ_KEY_NUM_CORE)
return UVERBS_API_KEY_ERR;
}
return id << UVERBS_API_OBJ_KEY_SHIFT;
}
static inline __attribute_const__ bool uapi_key_is_object(u32 key)
{
return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
}
static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id)
{
if (id & UVERBS_API_NS_FLAG) {
id &= ~UVERBS_API_NS_FLAG;
if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER)
return UVERBS_API_KEY_ERR;
id = id + UVERBS_API_METHOD_KEY_NUM_CORE;
} else {
id++;
if (id >= UVERBS_API_METHOD_KEY_NUM_CORE)
return UVERBS_API_KEY_ERR;
}
return id << UVERBS_API_METHOD_KEY_SHIFT;
}
static inline __attribute_const__ u32 uapi_key_write_method(u32 id)
{
if (id >= UVERBS_API_WRITE_KEY_NUM)
return UVERBS_API_KEY_ERR;
return UVERBS_API_METHOD_IS_WRITE | id;
}
static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id)
{
if (id >= UVERBS_API_WRITE_KEY_NUM)
return UVERBS_API_KEY_ERR;
return UVERBS_API_METHOD_IS_WRITE_EX | id;
}
static inline __attribute_const__ u32
uapi_key_attr_to_ioctl_method(u32 attr_key)
{
return attr_key &
(UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
}
static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
{
unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
(key & UVERBS_API_ATTR_KEY_MASK) == 0;
}
static inline __attribute_const__ bool uapi_key_is_write_method(u32 key)
{
return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE;
}
static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key)
{
return (key & UVERBS_API_METHOD_KEY_MASK) ==
UVERBS_API_METHOD_IS_WRITE_EX;
}
static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
{
/* 0 is the method slot itself */
return ioctl_method_key + 1;
}
static inline __attribute_const__ u32 uapi_key_attr(u32 id)
{
/*
* The attr is designed to fit in the typical single radix tree node
* of 64 entries. Since allmost all methods have driver attributes we
* organize things so that the driver and core attributes interleave to
* reduce the length of the attributes array in typical cases.
*/
if (id & UVERBS_API_NS_FLAG) {
id &= ~UVERBS_API_NS_FLAG;
id++;
if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
return UVERBS_API_KEY_ERR;
id = (id << 1) | 0;
} else {
if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
return UVERBS_API_KEY_ERR;
id = (id << 1) | 1;
}
return id;
}
/* Only true for ioctl methods */
static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
{
unsigned int method = key & UVERBS_API_METHOD_KEY_MASK;
return method != 0 && method < UVERBS_API_METHOD_IS_WRITE &&
(key & UVERBS_API_ATTR_KEY_MASK) != 0;
}
/*
* This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN),
* basically it undoes the reservation of 0 in the ID numbering. attr_key
* must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of
* uapi_key_attr().
*/
static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
{
return attr_key - 1;
}
static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey)
{
return attr_bkey + 1;
}
/*
* =======================================
* Verbs definitions
* =======================================
*/
struct uverbs_attr_def {
u16 id;
struct uverbs_attr_spec attr;
};
struct uverbs_method_def {
u16 id;
/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
u32 flags;
size_t num_attrs;
const struct uverbs_attr_def * const (*attrs)[];
int (*handler)(struct uverbs_attr_bundle *attrs);
};
struct uverbs_object_def {
u16 id;
const struct uverbs_obj_type *type_attrs;
size_t num_methods;
const struct uverbs_method_def * const (*methods)[];
};
enum uapi_definition_kind {
UAPI_DEF_END = 0,
UAPI_DEF_OBJECT_START,
UAPI_DEF_WRITE,
UAPI_DEF_CHAIN_OBJ_TREE,
UAPI_DEF_CHAIN,
UAPI_DEF_IS_SUPPORTED_FUNC,
UAPI_DEF_IS_SUPPORTED_DEV_FN,
};
enum uapi_definition_scope {
UAPI_SCOPE_OBJECT = 1,
UAPI_SCOPE_METHOD = 2,
};
struct uapi_definition {
u8 kind;
u8 scope;
union {
struct {
u16 object_id;
} object_start;
struct {
u16 command_num;
u8 is_ex:1;
u8 has_udata:1;
u8 has_resp:1;
u8 req_size;
u8 resp_size;
} write;
};
union {
bool (*func_is_supported)(struct ib_device *device);
int (*func_write)(struct uverbs_attr_bundle *attrs);
const struct uapi_definition *chain;
const struct uverbs_object_def *chain_obj_tree;
size_t needs_fn_offset;
};
};
/* Define things connected to object_id */
#define DECLARE_UVERBS_OBJECT(_object_id, ...) \
{ \
.kind = UAPI_DEF_OBJECT_START, \
.object_start = { .object_id = _object_id }, \
}, \
##__VA_ARGS__
/* Use in a var_args of DECLARE_UVERBS_OBJECT */
#define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \
{ \
.kind = UAPI_DEF_WRITE, \
.scope = UAPI_SCOPE_OBJECT, \
.write = { .is_ex = 0, .command_num = _command_num }, \
.func_write = _func, \
_cmd_desc, \
}, \
##__VA_ARGS__
/* Use in a var_args of DECLARE_UVERBS_OBJECT */
#define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \
{ \
.kind = UAPI_DEF_WRITE, \
.scope = UAPI_SCOPE_OBJECT, \
.write = { .is_ex = 1, .command_num = _command_num }, \
.func_write = _func, \
_cmd_desc, \
}, \
##__VA_ARGS__
/*
* Object is only supported if the function pointer named ibdev_fn in struct
* ib_device is not NULL.
*/
#define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \
{ \
.kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
.scope = UAPI_SCOPE_OBJECT, \
.needs_fn_offset = \
offsetof(struct ib_device_ops, ibdev_fn) + \
BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \
ibdev_fn) != \
sizeof(void *)), \
}
/*
* Method is only supported if the function pointer named ibdev_fn in struct
* ib_device is not NULL.
*/
#define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \
{ \
.kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
.scope = UAPI_SCOPE_METHOD, \
.needs_fn_offset = \
offsetof(struct ib_device_ops, ibdev_fn) + \
BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \
ibdev_fn) != \
sizeof(void *)), \
}
/* Call a function to determine if the entire object is supported or not */
#define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \
{ \
.kind = UAPI_DEF_IS_SUPPORTED_FUNC, \
.scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \
}
/* Include another struct uapi_definition in this one */
#define UAPI_DEF_CHAIN(_def_var) \
{ \
.kind = UAPI_DEF_CHAIN, .chain = _def_var, \
}
/* Temporary until the tree base description is replaced */
#define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \
{ \
.kind = UAPI_DEF_CHAIN_OBJ_TREE, \
.object_start = { .object_id = _object_enum }, \
.chain_obj_tree = _object_ptr, \
}, \
##__VA_ARGS__
#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \
UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, \
PTR_IF(IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS), \
&UVERBS_OBJECT(_object_enum)), \
##__VA_ARGS__)
/*
* =======================================
* Attribute Specifications
* =======================================
*/
#define UVERBS_ATTR_SIZE(_min_len, _len) \
.u.ptr.min_len = _min_len, .u.ptr.len = _len
#define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
/*
* Specifies a uapi structure that cannot be extended. The user must always
* supply the whole structure and nothing more. The structure must be declared
* in a header under include/uapi/rdma.
*/
#define UVERBS_ATTR_TYPE(_type) \
.u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
/*
* Specifies a uapi structure where the user must provide at least up to
* member 'last'. Anything after last and up until the end of the structure
* can be non-zero, anything longer than the end of the structure must be
* zero. The structure must be declared in a header under include/uapi/rdma.
*/
#define UVERBS_ATTR_STRUCT(_type, _last) \
.zero_trailing = 1, \
UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type))
/*
* Specifies at least min_len bytes must be passed in, but the amount can be
* larger, up to the protocol maximum size. No check for zeroing is done.
*/
#define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
/* Must be used in the '...' of any UVERBS_ATTR */
#define UA_ALLOC_AND_COPY .alloc_and_copy = 1
#define UA_MANDATORY .mandatory = 1
#define UA_OPTIONAL .mandatory = 0
/*
* min_len must be bigger than 0 and _max_len must be smaller than 4095. Only
* READ\WRITE accesses are supported.
*/
#define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \
...) \
(&(const struct uverbs_attr_def){ \
.id = (_attr_id) + \
BUILD_BUG_ON_ZERO((_min_len) == 0 || \
(_max_len) > \
PAGE_SIZE / sizeof(void *) || \
(_min_len) > (_max_len) || \
(_access) == UVERBS_ACCESS_NEW || \
(_access) == UVERBS_ACCESS_DESTROY), \
.attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \
.u2.objs_arr.obj_type = _idr_type, \
.u2.objs_arr.access = _access, \
.u2.objs_arr.min_len = _min_len, \
.u2.objs_arr.max_len = _max_len, \
__VA_ARGS__ } })
/*
* Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted,
* the user must validate the type of the uobject instead.
*/
#define UVERBS_IDR_ANY_OBJECT 0xFFFF
#define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
(&(const struct uverbs_attr_def){ \
.id = _attr_id, \
.attr = { .type = UVERBS_ATTR_TYPE_IDR, \
.u.obj.obj_type = _idr_type, \
.u.obj.access = _access, \
__VA_ARGS__ } })
#define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
(&(const struct uverbs_attr_def){ \
.id = (_attr_id) + \
BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \
(_access) != UVERBS_ACCESS_READ), \
.attr = { .type = UVERBS_ATTR_TYPE_FD, \
.u.obj.obj_type = _fd_type, \
.u.obj.access = _access, \
__VA_ARGS__ } })
#define UVERBS_ATTR_RAW_FD(_attr_id, ...) \
(&(const struct uverbs_attr_def){ \
.id = (_attr_id), \
.attr = { .type = UVERBS_ATTR_TYPE_RAW_FD, __VA_ARGS__ } })
#define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
(&(const struct uverbs_attr_def){ \
.id = _attr_id, \
.attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
_type, \
__VA_ARGS__ } })
#define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
(&(const struct uverbs_attr_def){ \
.id = _attr_id, \
.attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
_type, \
__VA_ARGS__ } })
/* _enum_arry should be a 'static const union uverbs_attr_spec[]' */
#define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \
(&(const struct uverbs_attr_def){ \
.id = _attr_id, \
.attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \
.u2.enum_def.ids = _enum_arr, \
.u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \
__VA_ARGS__ }, \
})
/* An input value that is a member in the enum _enum_type. */
#define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \
UVERBS_ATTR_PTR_IN( \
_attr_id, \
UVERBS_ATTR_SIZE( \
sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \
sizeof(u64)), \
__VA_ARGS__)
/*
* An input value that is a bitwise combination of values of _enum_type.
* This permits the flag value to be passed as either a u32 or u64, it must
* be retrieved via uverbs_get_flag().
*/
#define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \
UVERBS_ATTR_PTR_IN( \
_attr_id, \
UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \
!sizeof(_enum_type *)), \
sizeof(u64)), \
__VA_ARGS__)
/*
* This spec is used in order to pass information to the hardware driver in a
* legacy way. Every verb that could get driver specific data should get this
* spec.
*/
#define UVERBS_ATTR_UHW() \
UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
UVERBS_ATTR_MIN_SIZE(0), \
UA_OPTIONAL, \
.is_udata = 1), \
UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
UVERBS_ATTR_MIN_SIZE(0), \
UA_OPTIONAL, \
.is_udata = 1)
/* =================================================
* Parsing infrastructure
* =================================================
*/
struct uverbs_ptr_attr {
/*
* If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
* used.
*/
union {
void *ptr;
u64 data;
};
u16 len;
u16 uattr_idx;
u8 enum_id;
};
struct uverbs_obj_attr {
struct ib_uobject *uobject;
const struct uverbs_api_attr *attr_elm;
};
struct uverbs_objs_arr_attr {
struct ib_uobject **uobjects;
u16 len;
};
struct uverbs_attr {
union {
struct uverbs_ptr_attr ptr_attr;
struct uverbs_obj_attr obj_attr;
struct uverbs_objs_arr_attr objs_arr_attr;
};
};
struct uverbs_attr_bundle {
struct_group_tagged(uverbs_attr_bundle_hdr, hdr,
struct ib_udata driver_udata;
struct ib_udata ucore;
struct ib_uverbs_file *ufile;
struct ib_ucontext *context;
struct ib_uobject *uobject;
DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
);
struct uverbs_attr attrs[];
};
static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
unsigned int idx)
{
return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
attrs_bundle->attr_present);
}
/**
* rdma_udata_to_drv_context - Helper macro to get the driver's context out of
* ib_udata which is embedded in uverbs_attr_bundle.
*
* If udata is not NULL this cannot fail. Otherwise a NULL udata will result
* in a NULL ucontext pointer, as a safety precaution. Callers should be using
* 'udata' to determine if the driver call is in user or kernel mode, not
* 'ucontext'.
*
*/
static inline struct uverbs_attr_bundle *
rdma_udata_to_uverbs_attr_bundle(struct ib_udata *udata)
{
return container_of(udata, struct uverbs_attr_bundle, driver_udata);
}
#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
(udata ? container_of(rdma_udata_to_uverbs_attr_bundle(udata)->context, \
drv_dev_struct, member) : (drv_dev_struct *)NULL)
#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx)
{
if (!uverbs_attr_is_valid(attrs_bundle, idx))
return ERR_PTR(-ENOENT);
return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))];
}
static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return PTR_ERR(attr);
return attr->ptr_attr.enum_id;
}
static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx)
{
const struct uverbs_attr *attr;
attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return ERR_CAST(attr);
return attr->obj_attr.uobject->object;
}
static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return ERR_CAST(attr);
return attr->obj_attr.uobject;
}
static inline int
uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return PTR_ERR(attr);
return attr->ptr_attr.len;
}
void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle,
u16 idx);
/*
* uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr
* attribute.
* @attrs: The attribute bundle
* @idx: The ID of the attribute
* @elem_size: The size of the element in the array
*/
static inline int
uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx,
size_t elem_size)
{
int size = uverbs_attr_get_len(attrs, idx);
if (size < 0)
return size;
if (size % elem_size)
return -EINVAL;
return size / elem_size;
}
/**
* uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for
* UVERBS_ATTR_TYPE_IDRS_ARRAY.
* @arr: Returned pointer to array of pointers for uobjects or NULL if
* the attribute isn't provided.
*
* Return: The array length or 0 if no attribute was provided.
*/
static inline int uverbs_attr_get_uobjs_arr(
const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx,
struct ib_uobject ***arr)
{
const struct uverbs_attr *attr =
uverbs_attr_get(attrs_bundle, attr_idx);
if (IS_ERR(attr)) {
*arr = NULL;
return 0;
}
*arr = attr->objs_arr_attr.uobjects;
return attr->objs_arr_attr.len;
}
static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
{
return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
}
static inline void *uverbs_attr_get_alloced_ptr(
const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return (void *)attr;
return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data :
attr->ptr_attr.ptr;
}
static inline int _uverbs_copy_from(void *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx,
size_t size)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return PTR_ERR(attr);
/*
* Validation ensures attr->ptr_attr.len >= size. If the caller is
* using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call
* uverbs_copy_from_or_zero.
*/
if (unlikely(size < attr->ptr_attr.len))
return -EINVAL;
if (uverbs_attr_ptr_is_inline(attr))
memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
attr->ptr_attr.len))
return -EFAULT;
return 0;
}
static inline int _uverbs_copy_from_or_zero(void *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx,
size_t size)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
size_t min_size;
if (IS_ERR(attr))
return PTR_ERR(attr);
min_size = min_t(size_t, size, attr->ptr_attr.len);
if (uverbs_attr_ptr_is_inline(attr))
memcpy(to, &attr->ptr_attr.data, min_size);
else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data),
min_size))
return -EFAULT;
if (size > min_size)
memset(to + min_size, 0, size - min_size);
return 0;
}
#define uverbs_copy_from(to, attrs_bundle, idx) \
_uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to))
#define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \
_uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to))
static inline struct ib_ucontext *
ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs)
{
return ib_uverbs_get_ucontext_file(attrs->ufile);
}
#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx,
const void *from, size_t size);
__malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
gfp_t flags);
static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
size_t size)
{
return _uverbs_alloc(bundle, size, GFP_KERNEL);
}
static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
size_t size)
{
return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO);
}
static inline __malloc void *uverbs_kcalloc(struct uverbs_attr_bundle *bundle,
size_t n, size_t size)
{
size_t bytes;
if (unlikely(check_mul_overflow(n, size, &bytes)))
return ERR_PTR(-EOVERFLOW);
return uverbs_zalloc(bundle, bytes);
}
int _uverbs_get_const_signed(s64 *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, s64 lower_bound, u64 upper_bound,
s64 *def_val);
int _uverbs_get_const_unsigned(u64 *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 upper_bound, u64 *def_val);
int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
size_t idx, const void *from, size_t size);
#else
static inline int
uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits)
{
return -EINVAL;
}
static inline int
uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits)
{
return -EINVAL;
}
static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from, size_t size)
{
return -EINVAL;
}
static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
size_t size)
{
return ERR_PTR(-EINVAL);
}
static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle,
size_t size)
{
return ERR_PTR(-EINVAL);
}
static inline int
_uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, s64 lower_bound, u64 upper_bound,
s64 *def_val)
{
return -EINVAL;
}
static inline int
uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
size_t idx, const void *from, size_t size)
{
return -EINVAL;
}
static inline int
_uverbs_get_const_signed(s64 *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, s64 lower_bound, u64 upper_bound,
s64 *def_val)
{
return -EINVAL;
}
static inline int
_uverbs_get_const_unsigned(u64 *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 upper_bound, u64 *def_val)
{
return -EINVAL;
}
#endif
#define uverbs_get_const_signed(_to, _attrs_bundle, _idx) \
({ \
s64 _val; \
int _ret = \
_uverbs_get_const_signed(&_val, _attrs_bundle, _idx, \
type_min(typeof(*(_to))), \
type_max(typeof(*(_to))), NULL); \
(*(_to)) = _val; \
_ret; \
})
#define uverbs_get_const_unsigned(_to, _attrs_bundle, _idx) \
({ \
u64 _val; \
int _ret = \
_uverbs_get_const_unsigned(&_val, _attrs_bundle, _idx, \
type_max(typeof(*(_to))), NULL); \
(*(_to)) = _val; \
_ret; \
})
#define uverbs_get_const_default_signed(_to, _attrs_bundle, _idx, _default) \
({ \
s64 _val; \
s64 _def_val = _default; \
int _ret = \
_uverbs_get_const_signed(&_val, _attrs_bundle, _idx, \
type_min(typeof(*(_to))), \
type_max(typeof(*(_to))), &_def_val); \
(*(_to)) = _val; \
_ret; \
})
#define uverbs_get_const_default_unsigned(_to, _attrs_bundle, _idx, _default) \
({ \
u64 _val; \
u64 _def_val = _default; \
int _ret = \
_uverbs_get_const_unsigned(&_val, _attrs_bundle, _idx, \
type_max(typeof(*(_to))), &_def_val); \
(*(_to)) = _val; \
_ret; \
})
#define uverbs_get_const(_to, _attrs_bundle, _idx) \
(is_signed_type(typeof(*(_to))) ? \
uverbs_get_const_signed(_to, _attrs_bundle, _idx) : \
uverbs_get_const_unsigned(_to, _attrs_bundle, _idx)) \
#define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \
(is_signed_type(typeof(*(_to))) ? \
uverbs_get_const_default_signed(_to, _attrs_bundle, _idx, \
_default) : \
uverbs_get_const_default_unsigned(_to, _attrs_bundle, _idx, \
_default))
static inline int
uverbs_get_raw_fd(int *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx)
{
return uverbs_get_const_signed(to, attrs_bundle, idx);
}
#endif
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