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 #include "nx_icmpv6.h" 28 29 30 #ifdef FEATURE_NX_IPV6 31 32 #ifndef NX_DISABLE_ICMPV6_ROUTER_SOLICITATION 33 /**************************************************************************/ 34 /* */ 35 /* FUNCTION RELEASE */ 36 /* */ 37 /* _nxd_ipv6_router_solicitation_check PORTABLE C */ 38 /* 6.1 */ 39 /* AUTHOR */ 40 /* */ 41 /* Yuxin Zhou, Microsoft Corporation */ 42 /* */ 43 /* DESCRIPTION */ 44 /* */ 45 /* At every time tick, this function decrement the router solicitation */ 46 /* counter. When the counter reaches zero, the stack sends out */ 47 /* router solicitation. */ 48 /* */ 49 /* INPUT */ 50 /* */ 51 /* ip_ptr IP instance pointer */ 52 /* router_address The specific gateway address */ 53 /* to search for. */ 54 /* */ 55 /* OUTPUT */ 56 /* */ 57 /* None */ 58 /* */ 59 /* CALLS */ 60 /* */ 61 /* _nx_icmpv6_send_rs Send router solicitation packet*/ 62 /* */ 63 /* CALLED BY */ 64 /* */ 65 /* nx_ip_thread_entry Handle IP thread task events */ 66 /* */ 67 /* NOTE */ 68 /* */ 69 /* Caller must obtain nx_ip_protection mutex before calling this */ 70 /* function. */ 71 /* */ 72 /* This function cannot be called from ISR. */ 73 /* */ 74 /* RELEASE HISTORY */ 75 /* */ 76 /* DATE NAME DESCRIPTION */ 77 /* */ 78 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 79 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 80 /* resulting in version 6.1 */ 81 /* */ 82 /**************************************************************************/ _nxd_ipv6_router_solicitation_check(NX_IP * ip_ptr)83void _nxd_ipv6_router_solicitation_check(NX_IP *ip_ptr) 84 { 85 UINT i; 86 87 for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++) 88 { 89 if (ip_ptr -> nx_ip_interface[i].nx_interface_valid == NX_TRUE) 90 { 91 92 /* Check if max number of router solicitation messages have been sent. */ 93 if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count != 0) 94 { 95 96 /* Check on count down timer for sending out next router solicitation message. */ 97 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer--; 98 if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer == 0) 99 { 100 if (_nx_icmpv6_send_rs(ip_ptr, i) && 101 (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count == 102 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_max)) 103 { 104 105 /* Initial RS is not sent successfully. */ 106 /* Try it next round. */ 107 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = 1; 108 } 109 else 110 { 111 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count--; 112 ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_interval; 113 } 114 } 115 } 116 } 117 } 118 } 119 #endif /* NX_DISABLE_ICMPV6_ROUTER_SOLICITATION */ 120 #endif /* FEATURE_NX_IPV6 */ 121 122
