1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** NetX Component */ 17 /** */ 18 /** Internet Control Message Protocol (ICMP) */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define NX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "nx_api.h" 29 #include "nx_ipv6.h" 30 #include "nx_icmpv6.h" 31 32 #ifdef FEATURE_NX_IPV6 33 34 /**************************************************************************/ 35 /* */ 36 /* FUNCTION RELEASE */ 37 /* */ 38 /* _nx_icmpv6_validate_options PORTABLE C */ 39 /* 6.1 */ 40 /* AUTHOR */ 41 /* */ 42 /* Yuxin Zhou, Microsoft Corporation */ 43 /* */ 44 /* DESCRIPTION */ 45 /* */ 46 /* This function validates ICMPv6 additional options. */ 47 /* */ 48 /* INPUT */ 49 /* */ 50 /* option Pointer to ICMPv6 option */ 51 /* length Length of the Option field */ 52 /* additional_check Whether or not caller wishes to */ 53 /* perform additoinal verification */ 54 /* */ 55 /* OUTPUT */ 56 /* */ 57 /* NX_SUCCESS Options are valid */ 58 /* NX_NOT_SUCCESS Options are invalid */ 59 /* */ 60 /* CALLS */ 61 /* */ 62 /* None */ 63 /* */ 64 /* CALLED BY */ 65 /* */ 66 /* _nx_icmpv6_validate_neighbor_messages */ 67 /* _nx_icmpv6_validate_ra */ 68 /* */ 69 /* RELEASE HISTORY */ 70 /* */ 71 /* DATE NAME DESCRIPTION */ 72 /* */ 73 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 74 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 75 /* resulting in version 6.1 */ 76 /* */ 77 /**************************************************************************/ _nx_icmpv6_validate_options(NX_ICMPV6_OPTION * option,INT length,INT additional_check)78UINT _nx_icmpv6_validate_options(NX_ICMPV6_OPTION *option, INT length, INT additional_check) 79 { 80 81 UINT option_len; 82 83 /* Parse all option headers from the ICMPv6 header. */ 84 while (length > 0) 85 { 86 /* Verify that the option length is not zero. */ 87 if (option -> nx_icmpv6_option_length == 0) 88 { 89 return(NX_NOT_SUCCESSFUL); 90 } 91 92 /* Also check for NO SOURCE LINK LAYER ADDRESS. */ 93 if ((additional_check == NX_NO_SLLA) && 94 (option -> nx_icmpv6_option_type == 1)) 95 { 96 97 return(NX_NOT_SUCCESSFUL); 98 } 99 100 /* Get the next option. */ 101 option_len = ((UINT)option -> nx_icmpv6_option_length) << 3; 102 length -= (INT)option_len; 103 104 /*lint -e{923} suppress cast between pointer and ULONG, since it is necessary */ 105 option = (NX_ICMPV6_OPTION *)NX_UCHAR_POINTER_ADD(option, option_len); 106 } 107 108 if (length < 0) 109 { 110 111 /* Invalid packet length. */ 112 return(NX_NOT_SUCCESSFUL); 113 } 114 115 return(NX_SUCCESS); 116 } 117 118 #endif /* FEATURE_NX_IPV6 */ 119 120
