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 * $FreeBSD$ 32 */ 33 34 #ifndef _MLXFW_MFA2_TLV_H 35 #define _MLXFW_MFA2_TLV_H 36 37 #include <linux/kernel.h> 38 #include "mlxfw_mfa2_file.h" 39 40 struct mlxfw_mfa2_tlv { 41 u8 version; 42 u8 type; 43 __be16 len; 44 u8 data[0]; 45 } __packed; 46 47 static inline const struct mlxfw_mfa2_tlv * 48 mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const u8 *ptr) 49 { 50 if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) || 51 !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv))) 52 return NULL; 53 return (const struct mlxfw_mfa2_tlv *) ptr; 54 } 55 56 static inline const void * 57 mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file, 58 const struct mlxfw_mfa2_tlv *tlv, u8 payload_type, 59 size_t payload_size, bool varsize) 60 { 61 const u8 *tlv_top; 62 63 tlv_top = (const u8 *) tlv + be16_to_cpu(tlv->len) - 1; 64 if (!mlxfw_mfa2_valid_ptr(mfa2_file, (const u8 *) tlv) || 65 !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top)) 66 return NULL; 67 if (tlv->type != payload_type) 68 return NULL; 69 if (varsize && (be16_to_cpu(tlv->len) < payload_size)) 70 return NULL; 71 if (!varsize && (be16_to_cpu(tlv->len) != payload_size)) 72 return NULL; 73 74 return tlv->data; 75 } 76 77 #define MLXFW_MFA2_TLV(name, payload_type, tlv_type) \ 78 static inline const payload_type * \ 79 mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file, \ 80 const struct mlxfw_mfa2_tlv *tlv) \ 81 { \ 82 return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv, \ 83 tlv_type, sizeof(payload_type), \ 84 false); \ 85 } 86 87 #define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type) \ 88 static inline const payload_type * \ 89 mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file, \ 90 const struct mlxfw_mfa2_tlv *tlv) \ 91 { \ 92 return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv, \ 93 tlv_type, sizeof(payload_type), \ 94 true); \ 95 } 96 97 #endif 98