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 #include "nx_icmpv6.h" 29 30 31 #ifdef FEATURE_NX_IPV6 32 33 #ifndef NX_DISABLE_ICMPV6_ROUTER_SOLICITATION 34 /**************************************************************************/ 35 /* */ 36 /* FUNCTION RELEASE */ 37 /* */ 38 /* _nxd_ipv6_router_solicitation_check PORTABLE C */ 39 /* 6.1 */ 40 /* AUTHOR */ 41 /* */ 42 /* Yuxin Zhou, Microsoft Corporation */ 43 /* */ 44 /* DESCRIPTION */ 45 /* */ 46 /* At every time tick, this function decrement the router solicitation */ 47 /* counter. When the counter reaches zero, the stack sends out */ 48 /* router solicitation. */ 49 /* */ 50 /* INPUT */ 51 /* */ 52 /* ip_ptr IP instance pointer */ 53 /* router_address The specific gateway address */ 54 /* to search for. */ 55 /* */ 56 /* OUTPUT */ 57 /* */ 58 /* None */ 59 /* */ 60 /* CALLS */ 61 /* */ 62 /* _nx_icmpv6_send_rs Send router solicitation packet*/ 63 /* */ 64 /* CALLED BY */ 65 /* */ 66 /* nx_ip_thread_entry Handle IP thread task events */ 67 /* */ 68 /* NOTE */ 69 /* */ 70 /* Caller must obtain nx_ip_protection mutex before calling this */ 71 /* function. */ 72 /* */ 73 /* This function cannot be called from ISR. */ 74 /* */ 75 /* RELEASE HISTORY */ 76 /* */ 77 /* DATE NAME DESCRIPTION */ 78 /* */ 79 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 80 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 81 /* resulting in version 6.1 */ 82 /* */ 83 /**************************************************************************/ _nxd_ipv6_router_solicitation_check(NX_IP * ip_ptr)84void _nxd_ipv6_router_solicitation_check(NX_IP *ip_ptr) 85 { 86 UINT i; 87 88 for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++) 89 { 90 if (ip_ptr -> nx_ip_interface[i].nx_interface_valid == NX_TRUE) 91 { 92 93 /* Check if max number of router solicitation messages have been sent. */ 94 if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count != 0) 95 { 96 97 /* Check on count down timer for sending out next router solicitation message. */ 98 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer--; 99 if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer == 0) 100 { 101 if (_nx_icmpv6_send_rs(ip_ptr, i) && 102 (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count == 103 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_max)) 104 { 105 106 /* Initial RS is not sent successfully. */ 107 /* Try it next round. */ 108 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = 1; 109 } 110 else 111 { 112 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count--; 113 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_interval; 114 } 115 } 116 } 117 } 118 } 119 } 120 #endif /* NX_DISABLE_ICMPV6_ROUTER_SOLICITATION */ 121 #endif /* FEATURE_NX_IPV6 */ 122 123
