1 /*
2 * drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_tlv.h
3 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the names of the copyright holders nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #ifndef _MLXFW_MFA2_TLV_H
36 #define _MLXFW_MFA2_TLV_H
37
38 #include <linux/kernel.h>
39 #include "mlxfw_mfa2_file.h"
40
41 struct mlxfw_mfa2_tlv {
42 u8 version;
43 u8 type;
44 __be16 len;
45 u8 data[0];
46 } __packed;
47
48 static inline const struct mlxfw_mfa2_tlv *
mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file * mfa2_file,const void * ptr)49 mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const void *ptr)
50 {
51 if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) ||
52 !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv)))
53 return NULL;
54 return ptr;
55 }
56
57 static inline const void *
mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file * mfa2_file,const struct mlxfw_mfa2_tlv * tlv,u8 payload_type,size_t payload_size,bool varsize)58 mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file,
59 const struct mlxfw_mfa2_tlv *tlv, u8 payload_type,
60 size_t payload_size, bool varsize)
61 {
62 void *tlv_top;
63
64 tlv_top = (void *) tlv + be16_to_cpu(tlv->len) - 1;
65 if (!mlxfw_mfa2_valid_ptr(mfa2_file, tlv) ||
66 !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top))
67 return NULL;
68 if (tlv->type != payload_type)
69 return NULL;
70 if (varsize && (be16_to_cpu(tlv->len) < payload_size))
71 return NULL;
72 if (!varsize && (be16_to_cpu(tlv->len) != payload_size))
73 return NULL;
74
75 return tlv->data;
76 }
77
78 #define MLXFW_MFA2_TLV(name, payload_type, tlv_type) \
79 static inline const payload_type * \
80 mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file, \
81 const struct mlxfw_mfa2_tlv *tlv) \
82 { \
83 return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv, \
84 tlv_type, sizeof(payload_type), \
85 false); \
86 }
87
88 #define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type) \
89 static inline const payload_type * \
90 mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file, \
91 const struct mlxfw_mfa2_tlv *tlv) \
92 { \
93 return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv, \
94 tlv_type, sizeof(payload_type), \
95 true); \
96 }
97
98 #endif
99
