1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2017-2019 Mellanox Technologies.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Mellanox nor the names of contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef _MLXFW_MFA2_TLV_H
33#define _MLXFW_MFA2_TLV_H
34
35#include <linux/kernel.h>
36#include "mlxfw_mfa2_file.h"
37
38struct mlxfw_mfa2_tlv {
39	u8 version;
40	u8 type;
41	__be16 len;
42	u8 data[0];
43} __packed;
44
45static inline const struct mlxfw_mfa2_tlv *
46mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const u8 *ptr)
47{
48	if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) ||
49	    !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv)))
50		return NULL;
51	return (const struct mlxfw_mfa2_tlv *) ptr;
52}
53
54static inline const void *
55mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file,
56			   const struct mlxfw_mfa2_tlv *tlv, u8 payload_type,
57			   size_t payload_size, bool varsize)
58{
59	const u8 *tlv_top;
60
61	tlv_top = (const u8 *) tlv + be16_to_cpu(tlv->len) - 1;
62	if (!mlxfw_mfa2_valid_ptr(mfa2_file, (const u8 *) tlv) ||
63	    !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top))
64		return NULL;
65	if (tlv->type != payload_type)
66		return NULL;
67	if (varsize && (be16_to_cpu(tlv->len) < payload_size))
68		return NULL;
69	if (!varsize && (be16_to_cpu(tlv->len) != payload_size))
70		return NULL;
71
72	return tlv->data;
73}
74
75#define MLXFW_MFA2_TLV(name, payload_type, tlv_type)			       \
76static inline const payload_type *					       \
77mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
78				const struct mlxfw_mfa2_tlv *tlv)	       \
79{									       \
80	return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,		       \
81					  tlv_type, sizeof(payload_type),      \
82					  false);			       \
83}
84
85#define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type)		       \
86static inline const payload_type *					       \
87mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
88				const struct mlxfw_mfa2_tlv *tlv)	       \
89{									       \
90	return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,		       \
91					  tlv_type, sizeof(payload_type),      \
92					  true);			       \
93}
94
95#endif
96