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 /** NetX Component */ 15 /** */ 16 /** Internet Protocol version 6 Default Router Table (IPv6 router) */ 17 /** */ 18 /**************************************************************************/ 19 /**************************************************************************/ 20 #define NX_SOURCE_CODE 21 22 23 /* Include necessary system files. */ 24 25 #include "nx_api.h" 26 #include "nx_ipv6.h" 27 #include "nx_nd_cache.h" 28 29 30 #ifdef FEATURE_NX_IPV6 31 /**************************************************************************/ 32 /* */ 33 /* FUNCTION RELEASE */ 34 /* */ 35 /* _nxd_ipv6_search_onlink PORTABLE C */ 36 /* 6.1 */ 37 /* AUTHOR */ 38 /* */ 39 /* Yuxin Zhou, Microsoft Corporation */ 40 /* */ 41 /* DESCRIPTION */ 42 /* */ 43 /* This function checks whether a given IP address is on link. */ 44 /* */ 45 /* INPUT */ 46 /* */ 47 /* ip_ptr IP instance */ 48 /* dest_addr The destination address to */ 49 /* be checked. */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* status 0: Address is not onlink */ 54 /* 1: Address is onlink */ 55 /* */ 56 /* CALLS */ 57 /* */ 58 /* NONE */ 59 /* */ 60 /* CALLED BY */ 61 /* */ 62 /* nx_ipv6_packet_send Sends IPv6 packets from upper */ 63 /* layer to remote host */ 64 /* */ 65 /* RELEASE HISTORY */ 66 /* */ 67 /* DATE NAME DESCRIPTION */ 68 /* */ 69 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 70 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 71 /* resulting in version 6.1 */ 72 /* */ 73 /**************************************************************************/ _nxd_ipv6_search_onlink(NX_IP * ip_ptr,ULONG * dest_addr)74INT _nxd_ipv6_search_onlink(NX_IP *ip_ptr, ULONG *dest_addr) 75 { 76 77 UINT addr_index; 78 NX_IPV6_PREFIX_ENTRY *prefix_entry; 79 NXD_IPV6_ADDRESS *ipv6_address; 80 81 82 /* First special case is the link local address. All these 83 addresses are onlink. */ 84 if (IPv6_Address_Type(dest_addr) & IPV6_ADDRESS_LINKLOCAL) 85 { 86 return(1); 87 } 88 89 /* Set a local pointer for convenience. */ 90 prefix_entry = ip_ptr -> nx_ipv6_prefix_list_ptr; 91 92 /* Loop through the prefix table. Prefixes are the IPv6 equivalent of 93 network domains in IPv4. */ 94 while (prefix_entry) 95 { 96 97 /* Check whether or not the destination address is matched. */ 98 if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr, 99 prefix_entry -> nx_ipv6_prefix_entry_network_address, 100 prefix_entry -> nx_ipv6_prefix_entry_prefix_length)) 101 { 102 return(1); 103 } 104 105 /* No match. Try the next prefix. */ 106 prefix_entry = prefix_entry -> nx_ipv6_prefix_entry_next; 107 } 108 109 /* If no matches found in the prefix list, search the manually configured IPv6 interface addresses. */ 110 for (addr_index = 0; addr_index < NX_MAX_IPV6_ADDRESSES; addr_index++) 111 { 112 113 ipv6_address = &ip_ptr -> nx_ipv6_address[addr_index]; 114 /* Skip invalid entries. */ 115 if (!(ipv6_address -> nxd_ipv6_address_valid)) 116 { 117 continue; 118 } 119 120 /* Skip non-manually configured entires. */ 121 if (ipv6_address -> nxd_ipv6_address_ConfigurationMethod != NX_IPV6_ADDRESS_MANUAL_CONFIG) 122 { 123 continue; 124 } 125 126 /* Check whether or not the destination address is matched. */ 127 if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr, 128 ipv6_address -> nxd_ipv6_address, 129 ipv6_address -> nxd_ipv6_address_prefix_length)) 130 { 131 return(1); 132 } 133 } 134 135 136 /* No matches found. Not an onlink address. */ 137 return(0); 138 } 139 140 #endif /* FEATURE_NX_IPV6 */ 141 142
