1 /*************************************************************************** 2 * Copyright (c) 2024 Microsoft Corporation 3 * 4 * This program and the accompanying materials are made available under the 5 * terms of the MIT License which is available at 6 * https://opensource.org/licenses/MIT. 7 * 8 * SPDX-License-Identifier: MIT 9 **************************************************************************/ 10 /**************************************************************************/ 11 /**************************************************************************/ 12 /** */ 13 /** NetX Component */ 14 /** */ 15 /** Internet Protocol version 6 Default Router Table (IPv6 router) */ 16 /** */ 17 /**************************************************************************/ 18 /**************************************************************************/ 19 #define NX_SOURCE_CODE 20 21 22 /* Include necessary system files. */ 23 24 #include "nx_api.h" 25 #include "nx_ipv6.h" 26 #include "nx_nd_cache.h" 27 28 29 #ifdef FEATURE_NX_IPV6 30 /**************************************************************************/ 31 /* */ 32 /* FUNCTION RELEASE */ 33 /* */ 34 /* _nxd_ipv6_search_onlink PORTABLE C */ 35 /* 6.1 */ 36 /* AUTHOR */ 37 /* */ 38 /* Yuxin Zhou, Microsoft Corporation */ 39 /* */ 40 /* DESCRIPTION */ 41 /* */ 42 /* This function checks whether a given IP address is on link. */ 43 /* */ 44 /* INPUT */ 45 /* */ 46 /* ip_ptr IP instance */ 47 /* dest_addr The destination address to */ 48 /* be checked. */ 49 /* */ 50 /* OUTPUT */ 51 /* */ 52 /* status 0: Address is not onlink */ 53 /* 1: Address is onlink */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* NONE */ 58 /* */ 59 /* CALLED BY */ 60 /* */ 61 /* nx_ipv6_packet_send Sends IPv6 packets from upper */ 62 /* layer to remote host */ 63 /* */ 64 /* RELEASE HISTORY */ 65 /* */ 66 /* DATE NAME DESCRIPTION */ 67 /* */ 68 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 69 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 70 /* resulting in version 6.1 */ 71 /* */ 72 /**************************************************************************/ _nxd_ipv6_search_onlink(NX_IP * ip_ptr,ULONG * dest_addr)73INT _nxd_ipv6_search_onlink(NX_IP *ip_ptr, ULONG *dest_addr) 74 { 75 76 UINT addr_index; 77 NX_IPV6_PREFIX_ENTRY *prefix_entry; 78 NXD_IPV6_ADDRESS *ipv6_address; 79 80 81 /* First special case is the link local address. All these 82 addresses are onlink. */ 83 if (IPv6_Address_Type(dest_addr) & IPV6_ADDRESS_LINKLOCAL) 84 { 85 return(1); 86 } 87 88 /* Set a local pointer for convenience. */ 89 prefix_entry = ip_ptr -> nx_ipv6_prefix_list_ptr; 90 91 /* Loop through the prefix table. Prefixes are the IPv6 equivalent of 92 network domains in IPv4. */ 93 while (prefix_entry) 94 { 95 96 /* Check whether or not the destination address is matched. */ 97 if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr, 98 prefix_entry -> nx_ipv6_prefix_entry_network_address, 99 prefix_entry -> nx_ipv6_prefix_entry_prefix_length)) 100 { 101 return(1); 102 } 103 104 /* No match. Try the next prefix. */ 105 prefix_entry = prefix_entry -> nx_ipv6_prefix_entry_next; 106 } 107 108 /* If no matches found in the prefix list, search the manually configured IPv6 interface addresses. */ 109 for (addr_index = 0; addr_index < NX_MAX_IPV6_ADDRESSES; addr_index++) 110 { 111 112 ipv6_address = &ip_ptr -> nx_ipv6_address[addr_index]; 113 /* Skip invalid entries. */ 114 if (!(ipv6_address -> nxd_ipv6_address_valid)) 115 { 116 continue; 117 } 118 119 /* Skip non-manually configured entires. */ 120 if (ipv6_address -> nxd_ipv6_address_ConfigurationMethod != NX_IPV6_ADDRESS_MANUAL_CONFIG) 121 { 122 continue; 123 } 124 125 /* Check whether or not the destination address is matched. */ 126 if (CHECK_IP_ADDRESSES_BY_PREFIX(dest_addr, 127 ipv6_address -> nxd_ipv6_address, 128 ipv6_address -> nxd_ipv6_address_prefix_length)) 129 { 130 return(1); 131 } 132 } 133 134 135 /* No matches found. Not an onlink address. */ 136 return(0); 137 } 138 139 #endif /* FEATURE_NX_IPV6 */ 140 141
