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 * 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 * 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