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 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _nxd_ipv6_default_router_table_init PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Yuxin Zhou, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function initializes IPv6 routing table. Note it is up to the */ 45 /* caller to obtain mutex protection before writing to the table. */ 46 /* */ 47 /* INPUT */ 48 /* */ 49 /* ip_ptr Pointer to IP control block */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* None */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* None */ 58 /* */ 59 /* CALLED BY */ 60 /* */ 61 /* nx_ipv6_enable */ 62 /* */ 63 /* NOTE */ 64 /* */ 65 /* This function cannot be called from ISR. */ 66 /* */ 67 /* RELEASE HISTORY */ 68 /* */ 69 /* DATE NAME DESCRIPTION */ 70 /* */ 71 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 72 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 73 /* resulting in version 6.1 */ 74 /* */ 75 /**************************************************************************/ _nxd_ipv6_default_router_table_init(NX_IP * ip_ptr)76VOID _nxd_ipv6_default_router_table_init(NX_IP *ip_ptr) 77 { 78 79 ULONG i; 80 81 /* Initialize each entry in the default router table to null. */ 82 for (i = 0; i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE; i++) 83 { 84 85 ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_flag = 0; 86 ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_life_time = 0; 87 ip_ptr -> nx_ipv6_default_router_table[i].nx_ipv6_default_router_entry_neighbor_cache_ptr = NX_NULL; 88 } 89 90 /* Set the initial size to zero. */ 91 ip_ptr -> nx_ipv6_default_router_table_size = 0; 92 93 /* Initialize the index for recruiting less "reachable" routers 94 when the current router cannot be reached. */ 95 ip_ptr -> nx_ipv6_default_router_table_round_robin_index = 0; 96 97 /* Initialize the start of the prefix table (linked list) to NULL. */ 98 ip_ptr -> nx_ipv6_prefix_list_table[0].nx_ipv6_prefix_entry_prev = NX_NULL; 99 ip_ptr -> nx_ipv6_prefix_list_table[0].nx_ipv6_prefix_entry_next = &ip_ptr -> nx_ipv6_prefix_list_table[1]; 100 101 /* Link up the entries in the prefix table. */ 102 for (i = 1; i < NX_IPV6_PREFIX_LIST_TABLE_SIZE - 1; i++) 103 { 104 105 ip_ptr -> nx_ipv6_prefix_list_table[i].nx_ipv6_prefix_entry_prev = &ip_ptr -> nx_ipv6_prefix_list_table[i - 1]; 106 ip_ptr -> nx_ipv6_prefix_list_table[i].nx_ipv6_prefix_entry_next = &ip_ptr -> nx_ipv6_prefix_list_table[i + 1]; 107 } 108 109 /* Null terminate the end of the prefix table (linked list). */ 110 ip_ptr -> nx_ipv6_prefix_list_table[i].nx_ipv6_prefix_entry_prev = &ip_ptr -> nx_ipv6_prefix_list_table[i - 1]; 111 ip_ptr -> nx_ipv6_prefix_list_table[i].nx_ipv6_prefix_entry_next = NX_NULL; 112 113 /* Set the free list pointer to the 1st entry. */ 114 ip_ptr -> nx_ipv6_prefix_entry_free_list = &ip_ptr -> nx_ipv6_prefix_list_table[0]; 115 ip_ptr -> nx_ipv6_prefix_list_ptr = NX_NULL; 116 117 /* All done, return. */ 118 } 119 120 121 #endif /* FEATURE_NX_IPV6 */ 122 123
