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 38 struct mlxfw_mfa2_tlv { 39 u8 version; 40 u8 type; 41 __be16 len; 42 u8 data[0]; 43 } __packed; 44 45 static inline const struct mlxfw_mfa2_tlv * 46 mlxfw_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 54 static inline const void * 55 mlxfw_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) \ 76 static inline const payload_type * \ 77 mlxfw_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) \ 86 static inline const payload_type * \ 87 mlxfw_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