637 lines
19 KiB
C
637 lines
19 KiB
C
/*
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* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _UVERBS_IOCTL_
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#define _UVERBS_IOCTL_
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#include <rdma/uverbs_types.h>
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#include <linux/uaccess.h>
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#include <rdma/rdma_user_ioctl.h>
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#include <rdma/ib_user_ioctl_verbs.h>
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#include <rdma/ib_user_ioctl_cmds.h>
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/*
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* =======================================
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* Verbs action specifications
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* =======================================
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*/
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enum uverbs_attr_type {
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UVERBS_ATTR_TYPE_NA,
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UVERBS_ATTR_TYPE_PTR_IN,
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UVERBS_ATTR_TYPE_PTR_OUT,
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UVERBS_ATTR_TYPE_IDR,
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UVERBS_ATTR_TYPE_FD,
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UVERBS_ATTR_TYPE_ENUM_IN,
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};
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enum uverbs_obj_access {
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UVERBS_ACCESS_READ,
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UVERBS_ACCESS_WRITE,
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UVERBS_ACCESS_NEW,
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UVERBS_ACCESS_DESTROY
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};
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/* Specification of a single attribute inside the ioctl message */
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/* good size 16 */
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struct uverbs_attr_spec {
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u8 type;
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/*
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* Support extending attributes by length. Allow the user to provide
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* more bytes than ptr.len, but check that everything after is zero'd
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* by the user.
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*/
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u8 zero_trailing:1;
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/*
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* Valid only for PTR_IN. Allocate and copy the data inside
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* the parser
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*/
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u8 alloc_and_copy:1;
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u8 mandatory:1;
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union {
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struct {
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/* Current known size to kernel */
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u16 len;
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/* User isn't allowed to provide something < min_len */
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u16 min_len;
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} ptr;
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struct {
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/*
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* higher bits mean the namespace and lower bits mean
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* the type id within the namespace.
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*/
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u16 obj_type;
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u8 access;
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} obj;
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struct {
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u8 num_elems;
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} enum_def;
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} u;
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/* This weird split of the enum lets us remove some padding */
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union {
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struct {
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/*
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* The enum attribute can select one of the attributes
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* contained in the ids array. Currently only PTR_IN
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* attributes are supported in the ids array.
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*/
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const struct uverbs_attr_spec *ids;
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} enum_def;
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} u2;
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};
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/*
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* Information about the API is loaded into a radix tree. For IOCTL we start
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* with a tuple of:
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* object_id, attr_id, method_id
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*
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* Which is a 48 bit value, with most of the bits guaranteed to be zero. Based
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* on the current kernel support this is compressed into 16 bit key for the
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* radix tree. Since this compression is entirely internal to the kernel the
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* below limits can be revised if the kernel gains additional data.
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*
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* With 64 leafs per node this is a 3 level radix tree.
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*
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* The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns
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* the object slot, and OBJ_ID,METH_ID,0 and returns the method slot.
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*/
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enum uapi_radix_data {
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UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT,
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UVERBS_API_ATTR_KEY_BITS = 6,
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UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0),
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UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1,
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UVERBS_API_METHOD_KEY_BITS = 5,
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UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS,
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UVERBS_API_METHOD_KEY_NUM_CORE = 24,
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UVERBS_API_METHOD_KEY_NUM_DRIVER = (1 << UVERBS_API_METHOD_KEY_BITS) -
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UVERBS_API_METHOD_KEY_NUM_CORE,
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UVERBS_API_METHOD_KEY_MASK = GENMASK(
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UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1,
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UVERBS_API_METHOD_KEY_SHIFT),
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UVERBS_API_OBJ_KEY_BITS = 5,
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UVERBS_API_OBJ_KEY_SHIFT =
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UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT,
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UVERBS_API_OBJ_KEY_NUM_CORE = 24,
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UVERBS_API_OBJ_KEY_NUM_DRIVER =
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(1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE,
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UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT),
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/* This id guaranteed to not exist in the radix tree */
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UVERBS_API_KEY_ERR = 0xFFFFFFFF,
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};
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static inline __attribute_const__ u32 uapi_key_obj(u32 id)
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{
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if (id & UVERBS_API_NS_FLAG) {
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id &= ~UVERBS_API_NS_FLAG;
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if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER)
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return UVERBS_API_KEY_ERR;
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id = id + UVERBS_API_OBJ_KEY_NUM_CORE;
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} else {
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if (id >= UVERBS_API_OBJ_KEY_NUM_CORE)
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return UVERBS_API_KEY_ERR;
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}
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return id << UVERBS_API_OBJ_KEY_SHIFT;
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}
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static inline __attribute_const__ bool uapi_key_is_object(u32 key)
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{
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return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
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}
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static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id)
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{
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if (id & UVERBS_API_NS_FLAG) {
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id &= ~UVERBS_API_NS_FLAG;
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if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER)
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return UVERBS_API_KEY_ERR;
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id = id + UVERBS_API_METHOD_KEY_NUM_CORE;
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} else {
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id++;
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if (id >= UVERBS_API_METHOD_KEY_NUM_CORE)
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return UVERBS_API_KEY_ERR;
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}
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return id << UVERBS_API_METHOD_KEY_SHIFT;
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}
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static inline __attribute_const__ u32 uapi_key_attr_to_method(u32 attr_key)
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{
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return attr_key &
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(UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK);
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}
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static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key)
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{
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return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
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(key & UVERBS_API_ATTR_KEY_MASK) == 0;
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}
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static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key)
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{
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/* 0 is the method slot itself */
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return ioctl_method_key + 1;
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}
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static inline __attribute_const__ u32 uapi_key_attr(u32 id)
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{
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/*
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* The attr is designed to fit in the typical single radix tree node
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* of 64 entries. Since allmost all methods have driver attributes we
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* organize things so that the driver and core attributes interleave to
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* reduce the length of the attributes array in typical cases.
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*/
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if (id & UVERBS_API_NS_FLAG) {
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id &= ~UVERBS_API_NS_FLAG;
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id++;
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if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
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return UVERBS_API_KEY_ERR;
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id = (id << 1) | 0;
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} else {
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if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1))
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return UVERBS_API_KEY_ERR;
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id = (id << 1) | 1;
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}
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return id;
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}
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static inline __attribute_const__ bool uapi_key_is_attr(u32 key)
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{
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return (key & UVERBS_API_METHOD_KEY_MASK) != 0 &&
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(key & UVERBS_API_ATTR_KEY_MASK) != 0;
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}
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/*
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* This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN),
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* basically it undoes the reservation of 0 in the ID numbering. attr_key
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* must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of
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* uapi_key_attr().
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*/
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static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
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{
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return attr_key - 1;
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}
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/*
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* =======================================
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* Verbs definitions
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* =======================================
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*/
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struct uverbs_attr_def {
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u16 id;
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struct uverbs_attr_spec attr;
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};
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struct uverbs_method_def {
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u16 id;
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/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
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u32 flags;
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size_t num_attrs;
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const struct uverbs_attr_def * const (*attrs)[];
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int (*handler)(struct ib_uverbs_file *ufile,
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struct uverbs_attr_bundle *ctx);
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};
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struct uverbs_object_def {
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u16 id;
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const struct uverbs_obj_type *type_attrs;
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size_t num_methods;
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const struct uverbs_method_def * const (*methods)[];
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};
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struct uverbs_object_tree_def {
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size_t num_objects;
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const struct uverbs_object_def * const (*objects)[];
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};
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/*
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* =======================================
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* Attribute Specifications
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* =======================================
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*/
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#define UVERBS_ATTR_SIZE(_min_len, _len) \
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.u.ptr.min_len = _min_len, .u.ptr.len = _len
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#define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
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/*
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* Specifies a uapi structure that cannot be extended. The user must always
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* supply the whole structure and nothing more. The structure must be declared
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* in a header under include/uapi/rdma.
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*/
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#define UVERBS_ATTR_TYPE(_type) \
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.u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
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/*
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* Specifies a uapi structure where the user must provide at least up to
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* member 'last'. Anything after last and up until the end of the structure
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* can be non-zero, anything longer than the end of the structure must be
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* zero. The structure must be declared in a header under include/uapi/rdma.
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*/
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#define UVERBS_ATTR_STRUCT(_type, _last) \
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.zero_trailing = 1, \
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UVERBS_ATTR_SIZE(((uintptr_t)(&((_type *)0)->_last + 1)), \
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sizeof(_type))
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/*
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* Specifies at least min_len bytes must be passed in, but the amount can be
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* larger, up to the protocol maximum size. No check for zeroing is done.
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*/
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#define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
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/* Must be used in the '...' of any UVERBS_ATTR */
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#define UA_ALLOC_AND_COPY .alloc_and_copy = 1
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#define UA_MANDATORY .mandatory = 1
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#define UA_OPTIONAL .mandatory = 0
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#define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
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(&(const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_IDR, \
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.u.obj.obj_type = _idr_type, \
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.u.obj.access = _access, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
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(&(const struct uverbs_attr_def){ \
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.id = (_attr_id) + \
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BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \
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(_access) != UVERBS_ACCESS_READ), \
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.attr = { .type = UVERBS_ATTR_TYPE_FD, \
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.u.obj.obj_type = _fd_type, \
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.u.obj.access = _access, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
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(&(const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
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_type, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
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(&(const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
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_type, \
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__VA_ARGS__ } })
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/* _enum_arry should be a 'static const union uverbs_attr_spec[]' */
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#define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \
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(&(const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \
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.u2.enum_def.ids = _enum_arr, \
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.u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \
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__VA_ARGS__ }, \
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})
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/*
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* An input value that is a bitwise combination of values of _enum_type.
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* This permits the flag value to be passed as either a u32 or u64, it must
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* be retrieved via uverbs_get_flag().
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*/
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#define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \
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UVERBS_ATTR_PTR_IN( \
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_attr_id, \
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UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \
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!sizeof(_enum_type *)), \
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sizeof(u64)), \
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__VA_ARGS__)
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/*
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* This spec is used in order to pass information to the hardware driver in a
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* legacy way. Every verb that could get driver specific data should get this
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* spec.
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*/
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#define UVERBS_ATTR_UHW() \
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UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \
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UVERBS_ATTR_MIN_SIZE(0), \
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UA_OPTIONAL), \
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UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \
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UVERBS_ATTR_MIN_SIZE(0), \
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UA_OPTIONAL)
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/*
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* =======================================
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* Declaration helpers
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* =======================================
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*/
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#define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \
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static const struct uverbs_object_def *const _name##_ptr[] = { \
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__VA_ARGS__, \
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}; \
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static const struct uverbs_object_tree_def _name = { \
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.num_objects = ARRAY_SIZE(_name##_ptr), \
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.objects = &_name##_ptr, \
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}
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/* =================================================
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* Parsing infrastructure
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* =================================================
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*/
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struct uverbs_ptr_attr {
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/*
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* If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
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* used.
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*/
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union {
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void *ptr;
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u64 data;
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};
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u16 len;
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u16 uattr_idx;
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u8 enum_id;
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};
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struct uverbs_obj_attr {
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struct ib_uobject *uobject;
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const struct uverbs_api_attr *attr_elm;
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};
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struct uverbs_attr {
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union {
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struct uverbs_ptr_attr ptr_attr;
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struct uverbs_obj_attr obj_attr;
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};
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};
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struct uverbs_attr_bundle {
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struct ib_uverbs_file *ufile;
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DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
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struct uverbs_attr attrs[];
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};
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static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
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unsigned int idx)
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{
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return test_bit(uapi_bkey_attr(uapi_key_attr(idx)),
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attrs_bundle->attr_present);
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}
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#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
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static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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if (!uverbs_attr_is_valid(attrs_bundle, idx))
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return ERR_PTR(-ENOENT);
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return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))];
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}
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static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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return attr->ptr_attr.enum_id;
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}
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static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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const struct uverbs_attr *attr;
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attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return ERR_CAST(attr);
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return attr->obj_attr.uobject->object;
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}
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static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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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;
|
|
}
|
|
|
|
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))
|
|
|
|
#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);
|
|
}
|
|
#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);
|
|
}
|
|
#endif
|
|
|
|
#endif
|