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 /** Neighbor Discovery Cache */ 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_nd_cache.h" 31 #include "nx_packet.h" 32 #include "nx_icmpv6.h" 33 34 #ifdef FEATURE_NX_IPV6 35 36 37 /**************************************************************************/ 38 /* */ 39 /* FUNCTION RELEASE */ 40 /* */ 41 /* nx_nd_cache_delete_internal PORTABLE C */ 42 /* 6.1 */ 43 /* AUTHOR */ 44 /* */ 45 /* Yuxin Zhou, Microsoft Corporation */ 46 /* */ 47 /* DESCRIPTION */ 48 /* */ 49 /* This function deletes an IPv6 and MAC mapping from the ND cache */ 50 /* table. */ 51 /* */ 52 /* INPUT */ 53 /* */ 54 /* ip_ptr Pointer to IP. */ 55 /* dest_ip Pointer to the IP address. */ 56 /* */ 57 /* OUTPUT */ 58 /* */ 59 /* NX_SUCCESS Address is deleted */ 60 /* NX_ENTRY_NOT_FOUND Address not found in cache */ 61 /* */ 62 /* CALLS */ 63 /* */ 64 /* _nx_packet_transmit_releas Packet Release */ 65 /* memset */ 66 /* */ 67 /* CALLED BY */ 68 /* */ 69 /* nxd_ipv6_disable */ 70 /* nx_nd_cache_fast_periodic_update */ 71 /* nxd_nd_cache_entry_delete */ 72 /* */ 73 /* Note: */ 74 /* */ 75 /* This routine is an internal function. Therefore it assumes the */ 76 /* mutex is already locked. Caller is responsible for accquiring */ 77 /* and releasing the mutex before invoking this routine. */ 78 /* */ 79 /* */ 80 /* RELEASE HISTORY */ 81 /* */ 82 /* DATE NAME DESCRIPTION */ 83 /* */ 84 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 85 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 86 /* resulting in version 6.1 */ 87 /* */ 88 /**************************************************************************/ _nx_nd_cache_delete_internal(NX_IP * ip_ptr,ND_CACHE_ENTRY * entry)89UINT _nx_nd_cache_delete_internal(NX_IP *ip_ptr, ND_CACHE_ENTRY *entry) 90 { 91 92 UINT i = 0, table_size; 93 NX_PACKET *pkt, *next_pkt; 94 95 /* Free up the queued packets. */ 96 pkt = entry -> nx_nd_cache_packet_waiting_head; 97 98 /* Flush any packets enqueued waiting on neighbor reachability confirmation. */ 99 while (pkt) 100 { 101 102 next_pkt = pkt -> nx_packet_queue_next; 103 _nx_packet_transmit_release(pkt); 104 pkt = next_pkt; 105 } 106 entry -> nx_nd_cache_packet_waiting_queue_length = 0; 107 108 /* Clear the pointers to the original start and end of the packet queue. */ 109 entry -> nx_nd_cache_packet_waiting_head = NX_NULL; 110 entry -> nx_nd_cache_packet_waiting_tail = NX_NULL; 111 112 /* Initialize the rest of the fields. */ 113 memset(entry -> nx_nd_cache_mac_addr, 0, 6); 114 115 /* Clear the entry out. */ 116 entry -> nx_nd_cache_nd_status = ND_CACHE_STATE_INVALID; 117 entry -> nx_nd_cache_is_static = 0; 118 119 /* Is there a corresponding link in the default router list? */ 120 if (entry -> nx_nd_cache_is_router) 121 { 122 123 /* Set its pointer to this entry in the cache table to NULL. */ 124 entry -> nx_nd_cache_is_router -> nx_ipv6_default_router_entry_neighbor_cache_ptr = NX_NULL; 125 } 126 127 /* And indicate that this cache entry is no longer a router. */ 128 entry -> nx_nd_cache_is_router = NX_NULL; 129 130 /* Set a local variable for convenience. */ 131 table_size = ip_ptr -> nx_ipv6_destination_table_size; 132 133 while (table_size && i < NX_IPV6_DESTINATION_TABLE_SIZE) 134 { 135 136 /* Skip invalid entries. */ 137 if (!ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid) 138 { 139 i++; 140 continue; 141 } 142 143 /* Keep track of valid entries we have checked. */ 144 table_size--; 145 146 /* Find the destination unit. */ 147 if (ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry == entry) 148 { 149 150 /* Set the status. */ 151 ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid = 0; 152 153 /* Set its pointer to this entry in the destination table to NULL. */ 154 ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry = NX_NULL; 155 156 /* Update the destination_table size. */ 157 ip_ptr -> nx_ipv6_destination_table_size--; 158 } 159 160 i++; 161 } 162 163 return(NX_SUCCESS); 164 } 165 166 #endif /* FEATURE_NX_IPV6 */ 167 168
