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 /** NetX Component */ 16 /** */ 17 /** Internet Control Message Protocol (ICMP) */ 18 /** */ 19 /**************************************************************************/ 20 /**************************************************************************/ 21 22 #define NX_SOURCE_CODE 23 24 25 /* Include necessary system files. */ 26 #include "nx_api.h" 27 #include "nx_ipv6.h" 28 #include "nx_icmpv6.h" 29 30 #ifdef FEATURE_NX_IPV6 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _nxd_ipv6_destination_table_find_next_hop PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Yuxin Zhou, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This is an internal function. It searches the destination table */ 45 /* (equivalent to IPv4 static routing table) for a possible match. */ 46 /* */ 47 /* INPUT */ 48 /* */ 49 /* ip_ptr Pointer to IP. */ 50 /* destination_ip IP address to search for. */ 51 /* next_hop Storage space for next hop */ 52 /* address. */ 53 /* */ 54 /* OUTPUT */ 55 /* */ 56 /* NX_SUCCESS Valid next hop returned */ 57 /* NX_NOT_SUCCESSFUL Invalid pointer input or no */ 58 /* match found; next hop not */ 59 /* returned */ 60 /* CALLS */ 61 /* */ 62 /* */ 63 /* CALLED BY */ 64 /* */ 65 /* _nx_icmpv6_process_redirect Process incoming redirect */ 66 /* message. */ 67 /* */ 68 /* RELEASE HISTORY */ 69 /* */ 70 /* DATE NAME DESCRIPTION */ 71 /* */ 72 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 73 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 74 /* resulting in version 6.1 */ 75 /* */ 76 /**************************************************************************/ _nxd_ipv6_destination_table_find_next_hop(NX_IP * ip_ptr,ULONG * destination_ip,ULONG * next_hop)77UINT _nxd_ipv6_destination_table_find_next_hop(NX_IP *ip_ptr, ULONG *destination_ip, ULONG *next_hop) 78 { 79 80 UINT i, table_size; 81 UINT status; 82 83 84 status = NX_NOT_SUCCESSFUL; 85 86 /* Next hop storage must not be valid. */ 87 NX_ASSERT(next_hop != NX_NULL); 88 89 /* Set a local variable for convenience. */ 90 table_size = ip_ptr -> nx_ipv6_destination_table_size; 91 92 /* Check the num of destination. */ 93 if (table_size == 0) 94 { 95 return(NX_NOT_SUCCESSFUL); 96 } 97 98 /* Loop through all entries. */ 99 for (i = 0; table_size && (i < NX_IPV6_DESTINATION_TABLE_SIZE); i++) 100 { 101 102 /* Skip invalid entries. */ 103 if (!ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid) 104 { 105 continue; 106 } 107 108 /* Keep track of valid entries we have checked. */ 109 table_size--; 110 111 /* Check whether or not the address is the same. */ 112 if (CHECK_IPV6_ADDRESSES_SAME(ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_destination_address, destination_ip)) 113 { 114 115 /* Copy next hop address to user-supplied storage. */ 116 COPY_IPV6_ADDRESS(ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_next_hop, next_hop); 117 118 status = NX_SUCCESS; 119 120 /* break out of the for loop */ 121 break; 122 } 123 } 124 125 126 return(status); 127 } 128 129 130 #endif /* FEATURE_NX_IPV6 */ 131 132
