1 | /**
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2 | * @file
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3 | *
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4 | * @defgroup dhcp6 DHCPv6
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5 | * @ingroup ip6
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6 | * DHCPv6 client: IPv6 address autoconfiguration as per
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7 | * RFC 3315 (stateful DHCPv6) and
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8 | * RFC 3736 (stateless DHCPv6).
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9 | *
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10 | * For now, only stateless DHCPv6 is implemented!
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11 | *
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12 | * TODO:
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13 | * - enable/disable API to not always start when RA is received
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14 | * - stateful DHCPv6 (for now, only stateless DHCPv6 for DNS and NTP servers works)
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15 | * - create Client Identifier?
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16 | * - only start requests if a valid local address is available on the netif
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17 | * - only start information requests if required (not for every RA)
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18 | *
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19 | * dhcp6_enable_stateful() enables stateful DHCPv6 for a netif (stateless disabled)\n
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20 | * dhcp6_enable_stateless() enables stateless DHCPv6 for a netif (stateful disabled)\n
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21 | * dhcp6_disable() disable DHCPv6 for a netif
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22 | *
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23 | * When enabled, requests are only issued after receipt of RA with the
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24 | * corresponding bits set.
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25 | */
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26 |
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27 | /*
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28 | * Copyright (c) 2018 Simon Goldschmidt
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29 | * All rights reserved.
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30 | *
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31 | * Redistribution and use in source and binary forms, with or without modification,
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32 | * are permitted provided that the following conditions are met:
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33 | *
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34 | * 1. Redistributions of source code must retain the above copyright notice,
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35 | * this list of conditions and the following disclaimer.
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36 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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37 | * this list of conditions and the following disclaimer in the documentation
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38 | * and/or other materials provided with the distribution.
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39 | * 3. The name of the author may not be used to endorse or promote products
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40 | * derived from this software without specific prior written permission.
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41 | *
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42 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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43 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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44 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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45 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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46 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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47 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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48 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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49 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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50 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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51 | * OF SUCH DAMAGE.
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52 | *
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53 | * This file is part of the lwIP TCP/IP stack.
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54 | *
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55 | * Author: Simon Goldschmidt <goldsimon@gmx.de>
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56 | */
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57 |
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58 | #include "lwip/opt.h"
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59 |
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60 | #if LWIP_IPV6 && LWIP_IPV6_DHCP6 /* don't build if not configured for use in lwipopts.h */
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61 |
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62 | #include "lwip/dhcp6.h"
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63 | #include "lwip/prot/dhcp6.h"
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64 | #include "lwip/def.h"
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65 | #include "lwip/udp.h"
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66 | #include "lwip/dns.h"
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67 |
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68 | #include <string.h>
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69 |
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70 | #ifdef LWIP_HOOK_FILENAME
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71 | #include LWIP_HOOK_FILENAME
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72 | #endif
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73 | #ifndef LWIP_HOOK_DHCP6_APPEND_OPTIONS
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74 | #define LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, state, msg, msg_type, options_len_ptr, max_len)
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75 | #endif
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76 | #ifndef LWIP_HOOK_DHCP6_PARSE_OPTION
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77 | #define LWIP_HOOK_DHCP6_PARSE_OPTION(netif, dhcp6, state, msg, msg_type, option, len, pbuf, offset) do { LWIP_UNUSED_ARG(msg); } while(0)
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78 | #endif
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79 |
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80 | #if LWIP_DNS && LWIP_DHCP6_MAX_DNS_SERVERS
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81 | #if DNS_MAX_SERVERS > LWIP_DHCP6_MAX_DNS_SERVERS
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82 | #define LWIP_DHCP6_PROVIDE_DNS_SERVERS LWIP_DHCP6_MAX_DNS_SERVERS
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83 | #else
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84 | #define LWIP_DHCP6_PROVIDE_DNS_SERVERS DNS_MAX_SERVERS
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85 | #endif
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86 | #else
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87 | #define LWIP_DHCP6_PROVIDE_DNS_SERVERS 0
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88 | #endif
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89 |
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90 |
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91 | /** Option handling: options are parsed in dhcp6_parse_reply
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92 | * and saved in an array where other functions can load them from.
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93 | * This might be moved into the struct dhcp6 (not necessarily since
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94 | * lwIP is single-threaded and the array is only used while in recv
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95 | * callback). */
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96 | enum dhcp6_option_idx {
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97 | DHCP6_OPTION_IDX_CLI_ID = 0,
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98 | DHCP6_OPTION_IDX_SERVER_ID,
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99 | #if LWIP_DHCP6_PROVIDE_DNS_SERVERS
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100 | DHCP6_OPTION_IDX_DNS_SERVER,
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101 | DHCP6_OPTION_IDX_DOMAIN_LIST,
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102 | #endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS */
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103 | #if LWIP_DHCP6_GET_NTP_SRV
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104 | DHCP6_OPTION_IDX_NTP_SERVER,
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105 | #endif /* LWIP_DHCP_GET_NTP_SRV */
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106 | DHCP6_OPTION_IDX_MAX
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107 | };
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108 |
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109 | struct dhcp6_option_info {
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110 | u8_t option_given;
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111 | u16_t val_start;
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112 | u16_t val_length;
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113 | };
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114 |
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115 | /** Holds the decoded option info, only valid while in dhcp6_recv. */
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116 | struct dhcp6_option_info dhcp6_rx_options[DHCP6_OPTION_IDX_MAX];
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117 |
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118 | #define dhcp6_option_given(dhcp6, idx) (dhcp6_rx_options[idx].option_given != 0)
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119 | #define dhcp6_got_option(dhcp6, idx) (dhcp6_rx_options[idx].option_given = 1)
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120 | #define dhcp6_clear_option(dhcp6, idx) (dhcp6_rx_options[idx].option_given = 0)
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121 | #define dhcp6_clear_all_options(dhcp6) (memset(dhcp6_rx_options, 0, sizeof(dhcp6_rx_options)))
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122 | #define dhcp6_get_option_start(dhcp6, idx) (dhcp6_rx_options[idx].val_start)
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123 | #define dhcp6_get_option_length(dhcp6, idx) (dhcp6_rx_options[idx].val_length)
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124 | #define dhcp6_set_option(dhcp6, idx, start, len) do { dhcp6_rx_options[idx].val_start = (start); dhcp6_rx_options[idx].val_length = (len); }while(0)
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125 |
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126 |
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127 | const ip_addr_t dhcp6_All_DHCP6_Relay_Agents_and_Servers = IPADDR6_INIT_HOST(0xFF020000, 0, 0, 0x00010002);
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128 | const ip_addr_t dhcp6_All_DHCP6_Servers = IPADDR6_INIT_HOST(0xFF020000, 0, 0, 0x00010003);
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129 |
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130 | static struct udp_pcb *dhcp6_pcb;
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131 | static u8_t dhcp6_pcb_refcount;
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132 |
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133 |
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134 | /* receive, unfold, parse and free incoming messages */
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135 | static void dhcp6_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port);
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136 |
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137 | /** Ensure DHCP PCB is allocated and bound */
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138 | static err_t
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139 | dhcp6_inc_pcb_refcount(void)
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140 | {
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141 | if (dhcp6_pcb_refcount == 0) {
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142 | LWIP_ASSERT("dhcp6_inc_pcb_refcount(): memory leak", dhcp6_pcb == NULL);
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143 |
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144 | /* allocate UDP PCB */
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145 | dhcp6_pcb = udp_new_ip6();
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146 |
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147 | if (dhcp6_pcb == NULL) {
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148 | return ERR_MEM;
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149 | }
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150 |
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151 | ip_set_option(dhcp6_pcb, SOF_BROADCAST);
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152 |
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153 | /* set up local and remote port for the pcb -> listen on all interfaces on all src/dest IPs */
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154 | udp_bind(dhcp6_pcb, IP6_ADDR_ANY, DHCP6_CLIENT_PORT);
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155 | udp_recv(dhcp6_pcb, dhcp6_recv, NULL);
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156 | }
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157 |
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158 | dhcp6_pcb_refcount++;
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159 |
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160 | return ERR_OK;
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161 | }
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162 |
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163 | /** Free DHCP PCB if the last netif stops using it */
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164 | static void
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165 | dhcp6_dec_pcb_refcount(void)
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166 | {
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167 | LWIP_ASSERT("dhcp6_pcb_refcount(): refcount error", (dhcp6_pcb_refcount > 0));
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168 | dhcp6_pcb_refcount--;
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169 |
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170 | if (dhcp6_pcb_refcount == 0) {
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171 | udp_remove(dhcp6_pcb);
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172 | dhcp6_pcb = NULL;
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173 | }
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174 | }
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175 |
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176 | /**
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177 | * @ingroup dhcp6
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178 | * Set a statically allocated struct dhcp6 to work with.
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179 | * Using this prevents dhcp6_start to allocate it using mem_malloc.
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180 | *
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181 | * @param netif the netif for which to set the struct dhcp
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182 | * @param dhcp6 (uninitialised) dhcp6 struct allocated by the application
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183 | */
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184 | void
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185 | dhcp6_set_struct(struct netif *netif, struct dhcp6 *dhcp6)
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186 | {
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187 | LWIP_ASSERT("netif != NULL", netif != NULL);
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188 | LWIP_ASSERT("dhcp6 != NULL", dhcp6 != NULL);
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189 | LWIP_ASSERT("netif already has a struct dhcp6 set", netif_dhcp6_data(netif) == NULL);
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190 |
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191 | /* clear data structure */
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192 | memset(dhcp6, 0, sizeof(struct dhcp6));
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193 | /* dhcp6_set_state(&dhcp, DHCP6_STATE_OFF); */
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194 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, dhcp6);
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195 | }
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196 |
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197 | /**
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198 | * @ingroup dhcp6
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199 | * Removes a struct dhcp6 from a netif.
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200 | *
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201 | * ATTENTION: Only use this when not using dhcp6_set_struct() to allocate the
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202 | * struct dhcp6 since the memory is passed back to the heap.
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203 | *
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204 | * @param netif the netif from which to remove the struct dhcp
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205 | */
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206 | void dhcp6_cleanup(struct netif *netif)
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207 | {
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208 | LWIP_ASSERT("netif != NULL", netif != NULL);
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209 |
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210 | if (netif_dhcp6_data(netif) != NULL) {
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211 | mem_free(netif_dhcp6_data(netif));
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212 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, NULL);
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213 | }
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214 | }
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215 |
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216 | static struct dhcp6*
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217 | dhcp6_get_struct(struct netif *netif, const char *dbg_requester)
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218 | {
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219 | struct dhcp6 *dhcp6 = netif_dhcp6_data(netif);
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220 | if (dhcp6 == NULL) {
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221 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: mallocing new DHCPv6 client\n", dbg_requester));
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222 | dhcp6 = (struct dhcp6 *)mem_malloc(sizeof(struct dhcp6));
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223 | if (dhcp6 == NULL) {
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224 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: could not allocate dhcp6\n", dbg_requester));
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225 | return NULL;
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226 | }
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227 |
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228 | /* clear data structure, this implies DHCP6_STATE_OFF */
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229 | memset(dhcp6, 0, sizeof(struct dhcp6));
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230 | /* store this dhcp6 client in the netif */
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231 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, dhcp6);
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232 | } else {
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233 | /* already has DHCP6 client attached */
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234 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("%s: using existing DHCPv6 client\n", dbg_requester));
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235 | }
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236 |
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237 | if (!dhcp6->pcb_allocated) {
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238 | if (dhcp6_inc_pcb_refcount() != ERR_OK) { /* ensure DHCP6 PCB is allocated */
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239 | mem_free(dhcp6);
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240 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, NULL);
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241 | return NULL;
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242 | }
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243 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: allocated dhcp6", dbg_requester));
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244 | dhcp6->pcb_allocated = 1;
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245 | }
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246 | return dhcp6;
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247 | }
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248 |
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249 | /*
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250 | * Set the DHCPv6 state
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251 | * If the state changed, reset the number of tries.
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252 | */
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253 | static void
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254 | dhcp6_set_state(struct dhcp6 *dhcp6, u8_t new_state, const char *dbg_caller)
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255 | {
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256 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("DHCPv6 state: %d -> %d (%s)\n",
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257 | dhcp6->state, new_state, dbg_caller));
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258 | if (new_state != dhcp6->state) {
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259 | dhcp6->state = new_state;
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260 | dhcp6->tries = 0;
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261 | dhcp6->request_timeout = 0;
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262 | }
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263 | }
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264 |
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265 | static int
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266 | dhcp6_stateless_enabled(struct dhcp6 *dhcp6)
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267 | {
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268 | if ((dhcp6->state == DHCP6_STATE_STATELESS_IDLE) ||
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269 | (dhcp6->state == DHCP6_STATE_REQUESTING_CONFIG)) {
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270 | return 1;
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271 | }
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272 | return 0;
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273 | }
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274 |
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275 | /*static int
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276 | dhcp6_stateful_enabled(struct dhcp6 *dhcp6)
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277 | {
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278 | if (dhcp6->state == DHCP6_STATE_OFF) {
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279 | return 0;
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280 | }
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281 | if (dhcp6_stateless_enabled(dhcp6)) {
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282 | return 0;
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283 | }
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284 | return 1;
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285 | }*/
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286 |
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287 | /**
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288 | * @ingroup dhcp6
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289 | * Enable stateful DHCPv6 on this netif
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290 | * Requests are sent on receipt of an RA message with the
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291 | * ND6_RA_FLAG_MANAGED_ADDR_CONFIG flag set.
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292 | *
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293 | * A struct dhcp6 will be allocated for this netif if not
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294 | * set via @ref dhcp6_set_struct before.
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295 | *
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296 | * @todo: stateful DHCPv6 not supported, yet
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297 | */
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298 | err_t
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299 | dhcp6_enable_stateful(struct netif *netif)
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300 | {
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301 | LWIP_UNUSED_ARG(netif);
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302 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("stateful dhcp6 not implemented yet"));
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303 | return ERR_VAL;
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304 | }
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305 |
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306 | /**
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307 | * @ingroup dhcp6
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308 | * Enable stateless DHCPv6 on this netif
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309 | * Requests are sent on receipt of an RA message with the
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310 | * ND6_RA_FLAG_OTHER_CONFIG flag set.
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311 | *
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312 | * A struct dhcp6 will be allocated for this netif if not
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313 | * set via @ref dhcp6_set_struct before.
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314 | */
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315 | err_t
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316 | dhcp6_enable_stateless(struct netif *netif)
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317 | {
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318 | struct dhcp6 *dhcp6;
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319 |
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320 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp6_enable_stateless(netif=%p) %c%c%"U16_F"\n", (void *)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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321 |
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322 | dhcp6 = dhcp6_get_struct(netif, "dhcp6_enable_stateless()");
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323 | if (dhcp6 == NULL) {
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324 | return ERR_MEM;
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325 | }
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326 | if (dhcp6_stateless_enabled(dhcp6)) {
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327 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp6_enable_stateless(): stateless DHCPv6 already enabled"));
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328 | return ERR_OK;
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329 | } else if (dhcp6->state != DHCP6_STATE_OFF) {
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330 | /* stateful running */
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331 | /* @todo: stop stateful once it is implemented */
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332 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp6_enable_stateless(): switching from stateful to stateless DHCPv6"));
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333 | }
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334 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp6_enable_stateless(): stateless DHCPv6 enabled\n"));
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335 | dhcp6_set_state(dhcp6, DHCP6_STATE_STATELESS_IDLE, "dhcp6_enable_stateless");
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336 | return ERR_OK;
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337 | }
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338 |
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339 | /**
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340 | * @ingroup dhcp6
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341 | * Disable stateful or stateless DHCPv6 on this netif
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342 | * Requests are sent on receipt of an RA message with the
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343 | * ND6_RA_FLAG_OTHER_CONFIG flag set.
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344 | */
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345 | void
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346 | dhcp6_disable(struct netif *netif)
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347 | {
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348 | struct dhcp6 *dhcp6;
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349 |
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350 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp6_disable(netif=%p) %c%c%"U16_F"\n", (void *)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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351 |
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352 | dhcp6 = netif_dhcp6_data(netif);
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353 | if (dhcp6 != NULL) {
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354 | if (dhcp6->state != DHCP6_STATE_OFF) {
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355 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("dhcp6_disable(): DHCPv6 disabled (old state: %s)\n",
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356 | (dhcp6_stateless_enabled(dhcp6) ? "stateless" : "stateful")));
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357 | dhcp6_set_state(dhcp6, DHCP6_STATE_OFF, "dhcp6_disable");
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358 | if (dhcp6->pcb_allocated != 0) {
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359 | dhcp6_dec_pcb_refcount(); /* free DHCPv6 PCB if not needed any more */
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360 | dhcp6->pcb_allocated = 0;
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361 | }
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362 | }
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363 | }
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364 | }
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365 |
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366 | /**
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367 | * Create a DHCPv6 request, fill in common headers
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368 | *
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369 | * @param netif the netif under DHCPv6 control
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370 | * @param dhcp6 dhcp6 control struct
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371 | * @param message_type message type of the request
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372 | * @param opt_len_alloc option length to allocate
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373 | * @param options_out_len option length on exit
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374 | * @return a pbuf for the message
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375 | */
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376 | static struct pbuf *
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377 | dhcp6_create_msg(struct netif *netif, struct dhcp6 *dhcp6, u8_t message_type,
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378 | u16_t opt_len_alloc, u16_t *options_out_len)
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379 | {
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380 | struct pbuf *p_out;
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381 | struct dhcp6_msg *msg_out;
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382 |
|
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383 | LWIP_ERROR("dhcp6_create_msg: netif != NULL", (netif != NULL), return NULL;);
|
---|
384 | LWIP_ERROR("dhcp6_create_msg: dhcp6 != NULL", (dhcp6 != NULL), return NULL;);
|
---|
385 | p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp6_msg) + opt_len_alloc, PBUF_RAM);
|
---|
386 | if (p_out == NULL) {
|
---|
387 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
---|
388 | ("dhcp6_create_msg(): could not allocate pbuf\n"));
|
---|
389 | return NULL;
|
---|
390 | }
|
---|
391 | LWIP_ASSERT("dhcp6_create_msg: check that first pbuf can hold struct dhcp6_msg",
|
---|
392 | (p_out->len >= sizeof(struct dhcp6_msg) + opt_len_alloc));
|
---|
393 |
|
---|
394 | /* @todo: limit new xid for certain message types? */
|
---|
395 | /* reuse transaction identifier in retransmissions */
|
---|
396 | if (dhcp6->tries == 0) {
|
---|
397 | dhcp6->xid = LWIP_RAND() & 0xFFFFFF;
|
---|
398 | }
|
---|
399 |
|
---|
400 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE,
|
---|
401 | ("transaction id xid(%"X32_F")\n", dhcp6->xid));
|
---|
402 |
|
---|
403 | msg_out = (struct dhcp6_msg *)p_out->payload;
|
---|
404 | memset(msg_out, 0, sizeof(struct dhcp6_msg) + opt_len_alloc);
|
---|
405 |
|
---|
406 | msg_out->msgtype = message_type;
|
---|
407 | msg_out->transaction_id[0] = (u8_t)(dhcp6->xid >> 16);
|
---|
408 | msg_out->transaction_id[1] = (u8_t)(dhcp6->xid >> 8);
|
---|
409 | msg_out->transaction_id[2] = (u8_t)dhcp6->xid;
|
---|
410 | *options_out_len = 0;
|
---|
411 | return p_out;
|
---|
412 | }
|
---|
413 |
|
---|
414 | static u16_t
|
---|
415 | dhcp6_option_short(u16_t options_out_len, u8_t *options, u16_t value)
|
---|
416 | {
|
---|
417 | options[options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
|
---|
418 | options[options_out_len++] = (u8_t) (value & 0x00ffU);
|
---|
419 | return options_out_len;
|
---|
420 | }
|
---|
421 |
|
---|
422 | static u16_t
|
---|
423 | dhcp6_option_optionrequest(u16_t options_out_len, u8_t *options, const u16_t *req_options,
|
---|
424 | u16_t num_req_options, u16_t max_len)
|
---|
425 | {
|
---|
426 | size_t i;
|
---|
427 | u16_t ret;
|
---|
428 |
|
---|
429 | LWIP_ASSERT("dhcp6_option_optionrequest: options_out_len + sizeof(struct dhcp6_msg) + addlen <= max_len",
|
---|
430 | sizeof(struct dhcp6_msg) + options_out_len + 4U + (2U * num_req_options) <= max_len);
|
---|
431 | LWIP_UNUSED_ARG(max_len);
|
---|
432 |
|
---|
433 | ret = dhcp6_option_short(options_out_len, options, DHCP6_OPTION_ORO);
|
---|
434 | ret = dhcp6_option_short(ret, options, 2 * num_req_options);
|
---|
435 | for (i = 0; i < num_req_options; i++) {
|
---|
436 | ret = dhcp6_option_short(ret, options, req_options[i]);
|
---|
437 | }
|
---|
438 | return ret;
|
---|
439 | }
|
---|
440 |
|
---|
441 | /* All options are added, shrink the pbuf to the required size */
|
---|
442 | static void
|
---|
443 | dhcp6_msg_finalize(u16_t options_out_len, struct pbuf *p_out)
|
---|
444 | {
|
---|
445 | /* shrink the pbuf to the actual content length */
|
---|
446 | pbuf_realloc(p_out, (u16_t)(sizeof(struct dhcp6_msg) + options_out_len));
|
---|
447 | }
|
---|
448 |
|
---|
449 |
|
---|
450 | #if LWIP_IPV6_DHCP6_STATELESS
|
---|
451 | static void
|
---|
452 | dhcp6_information_request(struct netif *netif, struct dhcp6 *dhcp6)
|
---|
453 | {
|
---|
454 | const u16_t requested_options[] = {DHCP6_OPTION_DNS_SERVERS, DHCP6_OPTION_DOMAIN_LIST, DHCP6_OPTION_SNTP_SERVERS};
|
---|
455 | u16_t msecs;
|
---|
456 | struct pbuf *p_out;
|
---|
457 | u16_t options_out_len;
|
---|
458 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("dhcp6_information_request()\n"));
|
---|
459 | /* create and initialize the DHCP message header */
|
---|
460 | p_out = dhcp6_create_msg(netif, dhcp6, DHCP6_INFOREQUEST, 4 + sizeof(requested_options), &options_out_len);
|
---|
461 | if (p_out != NULL) {
|
---|
462 | err_t err;
|
---|
463 | struct dhcp6_msg *msg_out = (struct dhcp6_msg *)p_out->payload;
|
---|
464 | u8_t *options = (u8_t *)(msg_out + 1);
|
---|
465 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("dhcp6_information_request: making request\n"));
|
---|
466 |
|
---|
467 | options_out_len = dhcp6_option_optionrequest(options_out_len, options, requested_options,
|
---|
468 | LWIP_ARRAYSIZE(requested_options), p_out->len);
|
---|
469 | LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, DHCP6_STATE_REQUESTING_CONFIG, msg_out,
|
---|
470 | DHCP6_INFOREQUEST, options_out_len, p_out->len);
|
---|
471 | dhcp6_msg_finalize(options_out_len, p_out);
|
---|
472 |
|
---|
473 | err = udp_sendto_if(dhcp6_pcb, p_out, &dhcp6_All_DHCP6_Relay_Agents_and_Servers, DHCP6_SERVER_PORT, netif);
|
---|
474 | pbuf_free(p_out);
|
---|
475 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp6_information_request: INFOREQUESTING -> %d\n", (int)err));
|
---|
476 | LWIP_UNUSED_ARG(err);
|
---|
477 | } else {
|
---|
478 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp6_information_request: could not allocate DHCP6 request\n"));
|
---|
479 | }
|
---|
480 | dhcp6_set_state(dhcp6, DHCP6_STATE_REQUESTING_CONFIG, "dhcp6_information_request");
|
---|
481 | if (dhcp6->tries < 255) {
|
---|
482 | dhcp6->tries++;
|
---|
483 | }
|
---|
484 | msecs = (u16_t)((dhcp6->tries < 6 ? 1 << dhcp6->tries : 60) * 1000);
|
---|
485 | dhcp6->request_timeout = (u16_t)((msecs + DHCP6_TIMER_MSECS - 1) / DHCP6_TIMER_MSECS);
|
---|
486 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp6_information_request(): set request timeout %"U16_F" msecs\n", msecs));
|
---|
487 | }
|
---|
488 |
|
---|
489 | static err_t
|
---|
490 | dhcp6_request_config(struct netif *netif, struct dhcp6 *dhcp6)
|
---|
491 | {
|
---|
492 | /* stateless mode enabled and no request running? */
|
---|
493 | if (dhcp6->state == DHCP6_STATE_STATELESS_IDLE) {
|
---|
494 | /* send Information-request and wait for answer; setup receive timeout */
|
---|
495 | dhcp6_information_request(netif, dhcp6);
|
---|
496 | }
|
---|
497 |
|
---|
498 | return ERR_OK;
|
---|
499 | }
|
---|
500 |
|
---|
501 | static void
|
---|
502 | dhcp6_abort_config_request(struct dhcp6 *dhcp6)
|
---|
503 | {
|
---|
504 | if (dhcp6->state == DHCP6_STATE_REQUESTING_CONFIG) {
|
---|
505 | /* abort running request */
|
---|
506 | dhcp6_set_state(dhcp6, DHCP6_STATE_STATELESS_IDLE, "dhcp6_abort_config_request");
|
---|
507 | }
|
---|
508 | }
|
---|
509 |
|
---|
510 | /* Handle a REPLY to INFOREQUEST
|
---|
511 | * This parses DNS and NTP server addresses from the reply.
|
---|
512 | */
|
---|
513 | static void
|
---|
514 | dhcp6_handle_config_reply(struct netif *netif, struct pbuf *p_msg_in)
|
---|
515 | {
|
---|
516 | struct dhcp6 *dhcp6 = netif_dhcp6_data(netif);
|
---|
517 |
|
---|
518 | LWIP_UNUSED_ARG(dhcp6);
|
---|
519 | LWIP_UNUSED_ARG(p_msg_in);
|
---|
520 |
|
---|
521 | #if LWIP_DHCP6_PROVIDE_DNS_SERVERS
|
---|
522 | if (dhcp6_option_given(dhcp6, DHCP6_OPTION_IDX_DNS_SERVER)) {
|
---|
523 | ip_addr_t dns_addr;
|
---|
524 | ip6_addr_t *dns_addr6;
|
---|
525 | u16_t op_start = dhcp6_get_option_start(dhcp6, DHCP6_OPTION_IDX_DNS_SERVER);
|
---|
526 | u16_t op_len = dhcp6_get_option_length(dhcp6, DHCP6_OPTION_IDX_DNS_SERVER);
|
---|
527 | u16_t idx;
|
---|
528 | u8_t n;
|
---|
529 |
|
---|
530 | memset(&dns_addr, 0, sizeof(dns_addr));
|
---|
531 | dns_addr6 = ip_2_ip6(&dns_addr);
|
---|
532 | for (n = 0, idx = op_start; (idx < op_start + op_len) && (n < LWIP_DHCP6_PROVIDE_DNS_SERVERS);
|
---|
533 | n++, idx += sizeof(struct ip6_addr_packed)) {
|
---|
534 | u16_t copied = pbuf_copy_partial(p_msg_in, dns_addr6, sizeof(struct ip6_addr_packed), idx);
|
---|
535 | if (copied != sizeof(struct ip6_addr_packed)) {
|
---|
536 | /* pbuf length mismatch */
|
---|
537 | return;
|
---|
538 | }
|
---|
539 | ip6_addr_assign_zone(dns_addr6, IP6_UNKNOWN, netif);
|
---|
540 | /* @todo: do we need a different offset than DHCP(v4)? */
|
---|
541 | dns_setserver(n, &dns_addr);
|
---|
542 | }
|
---|
543 | }
|
---|
544 | /* @ todo: parse and set Domain Search List */
|
---|
545 | #endif /* LWIP_DHCP6_PROVIDE_DNS_SERVERS */
|
---|
546 |
|
---|
547 | #if LWIP_DHCP6_GET_NTP_SRV
|
---|
548 | if (dhcp6_option_given(dhcp6, DHCP6_OPTION_IDX_NTP_SERVER)) {
|
---|
549 | ip_addr_t ntp_server_addrs[LWIP_DHCP6_MAX_NTP_SERVERS];
|
---|
550 | u16_t op_start = dhcp6_get_option_start(dhcp6, DHCP6_OPTION_IDX_NTP_SERVER);
|
---|
551 | u16_t op_len = dhcp6_get_option_length(dhcp6, DHCP6_OPTION_IDX_NTP_SERVER);
|
---|
552 | u16_t idx;
|
---|
553 | u8_t n;
|
---|
554 |
|
---|
555 | for (n = 0, idx = op_start; (idx < op_start + op_len) && (n < LWIP_DHCP6_MAX_NTP_SERVERS);
|
---|
556 | n++, idx += sizeof(struct ip6_addr_packed)) {
|
---|
557 | u16_t copied;
|
---|
558 | ip6_addr_t *ntp_addr6 = ip_2_ip6(&ntp_server_addrs[n]);
|
---|
559 | ip_addr_set_zero_ip6(&ntp_server_addrs[n]);
|
---|
560 | copied = pbuf_copy_partial(p_msg_in, ntp_addr6, sizeof(struct ip6_addr_packed), idx);
|
---|
561 | if (copied != sizeof(struct ip6_addr_packed)) {
|
---|
562 | /* pbuf length mismatch */
|
---|
563 | return;
|
---|
564 | }
|
---|
565 | ip6_addr_assign_zone(ntp_addr6, IP6_UNKNOWN, netif);
|
---|
566 | }
|
---|
567 | dhcp6_set_ntp_servers(n, ntp_server_addrs);
|
---|
568 | }
|
---|
569 | #endif /* LWIP_DHCP6_GET_NTP_SRV */
|
---|
570 | }
|
---|
571 | #endif /* LWIP_IPV6_DHCP6_STATELESS */
|
---|
572 |
|
---|
573 | /** This function is called from nd6 module when an RA messsage is received
|
---|
574 | * It triggers DHCPv6 requests (if enabled).
|
---|
575 | */
|
---|
576 | void
|
---|
577 | dhcp6_nd6_ra_trigger(struct netif *netif, u8_t managed_addr_config, u8_t other_config)
|
---|
578 | {
|
---|
579 | struct dhcp6 *dhcp6;
|
---|
580 |
|
---|
581 | LWIP_ASSERT("netif != NULL", netif != NULL);
|
---|
582 | dhcp6 = netif_dhcp6_data(netif);
|
---|
583 |
|
---|
584 | LWIP_UNUSED_ARG(managed_addr_config);
|
---|
585 | LWIP_UNUSED_ARG(other_config);
|
---|
586 | LWIP_UNUSED_ARG(dhcp6);
|
---|
587 |
|
---|
588 | #if LWIP_IPV6_DHCP6_STATELESS
|
---|
589 | if (dhcp6 != NULL) {
|
---|
590 | if (dhcp6_stateless_enabled(dhcp6)) {
|
---|
591 | if (other_config) {
|
---|
592 | dhcp6_request_config(netif, dhcp6);
|
---|
593 | } else {
|
---|
594 | dhcp6_abort_config_request(dhcp6);
|
---|
595 | }
|
---|
596 | }
|
---|
597 | }
|
---|
598 | #endif /* LWIP_IPV6_DHCP6_STATELESS */
|
---|
599 | }
|
---|
600 |
|
---|
601 | /**
|
---|
602 | * Parse the DHCPv6 message and extract the DHCPv6 options.
|
---|
603 | *
|
---|
604 | * Extract the DHCPv6 options (offset + length) so that we can later easily
|
---|
605 | * check for them or extract the contents.
|
---|
606 | */
|
---|
607 | static err_t
|
---|
608 | dhcp6_parse_reply(struct pbuf *p, struct dhcp6 *dhcp6)
|
---|
609 | {
|
---|
610 | u16_t offset;
|
---|
611 | u16_t offset_max;
|
---|
612 | u16_t options_idx;
|
---|
613 | struct dhcp6_msg *msg_in;
|
---|
614 |
|
---|
615 | LWIP_UNUSED_ARG(dhcp6);
|
---|
616 |
|
---|
617 | /* clear received options */
|
---|
618 | dhcp6_clear_all_options(dhcp6);
|
---|
619 | msg_in = (struct dhcp6_msg *)p->payload;
|
---|
620 |
|
---|
621 | /* parse options */
|
---|
622 |
|
---|
623 | options_idx = sizeof(struct dhcp6_msg);
|
---|
624 | /* parse options to the end of the received packet */
|
---|
625 | offset_max = p->tot_len;
|
---|
626 |
|
---|
627 | offset = options_idx;
|
---|
628 | /* at least 4 byte to read? */
|
---|
629 | while ((offset + 4 <= offset_max)) {
|
---|
630 | u8_t op_len_buf[4];
|
---|
631 | u8_t *op_len;
|
---|
632 | u16_t op;
|
---|
633 | u16_t len;
|
---|
634 | u16_t val_offset = (u16_t)(offset + 4);
|
---|
635 | if (val_offset < offset) {
|
---|
636 | /* overflow */
|
---|
637 | return ERR_BUF;
|
---|
638 | }
|
---|
639 | /* copy option + length, might be split accross pbufs */
|
---|
640 | op_len = (u8_t *)pbuf_get_contiguous(p, op_len_buf, 4, 4, offset);
|
---|
641 | if (op_len == NULL) {
|
---|
642 | /* failed to get option and length */
|
---|
643 | return ERR_VAL;
|
---|
644 | }
|
---|
645 | op = (op_len[0] << 8) | op_len[1];
|
---|
646 | len = (op_len[2] << 8) | op_len[3];
|
---|
647 | offset = val_offset + len;
|
---|
648 | if (offset < val_offset) {
|
---|
649 | /* overflow */
|
---|
650 | return ERR_BUF;
|
---|
651 | }
|
---|
652 |
|
---|
653 | switch (op) {
|
---|
654 | case (DHCP6_OPTION_CLIENTID):
|
---|
655 | dhcp6_got_option(dhcp6, DHCP6_OPTION_IDX_CLI_ID);
|
---|
656 | dhcp6_set_option(dhcp6, DHCP6_OPTION_IDX_CLI_ID, val_offset, len);
|
---|
657 | break;
|
---|
658 | case (DHCP6_OPTION_SERVERID):
|
---|
659 | dhcp6_got_option(dhcp6, DHCP6_OPTION_IDX_SERVER_ID);
|
---|
660 | dhcp6_set_option(dhcp6, DHCP6_OPTION_IDX_SERVER_ID, val_offset, len);
|
---|
661 | break;
|
---|
662 | #if LWIP_DHCP6_PROVIDE_DNS_SERVERS
|
---|
663 | case (DHCP6_OPTION_DNS_SERVERS):
|
---|
664 | dhcp6_got_option(dhcp6, DHCP6_OPTION_IDX_DNS_SERVER);
|
---|
665 | dhcp6_set_option(dhcp6, DHCP6_OPTION_IDX_DNS_SERVER, val_offset, len);
|
---|
666 | break;
|
---|
667 | case (DHCP6_OPTION_DOMAIN_LIST):
|
---|
668 | dhcp6_got_option(dhcp6, DHCP6_OPTION_IDX_DOMAIN_LIST);
|
---|
669 | dhcp6_set_option(dhcp6, DHCP6_OPTION_IDX_DOMAIN_LIST, val_offset, len);
|
---|
670 | break;
|
---|
671 | #endif /* LWIP_DHCP6_PROVIDE_DNS_SERVERS */
|
---|
672 | #if LWIP_DHCP6_GET_NTP_SRV
|
---|
673 | case (DHCP6_OPTION_SNTP_SERVERS):
|
---|
674 | dhcp6_got_option(dhcp6, DHCP6_OPTION_IDX_NTP_SERVER);
|
---|
675 | dhcp6_set_option(dhcp6, DHCP6_OPTION_IDX_NTP_SERVER, val_offset, len);
|
---|
676 | break;
|
---|
677 | #endif /* LWIP_DHCP6_GET_NTP_SRV*/
|
---|
678 | default:
|
---|
679 | LWIP_DEBUGF(DHCP6_DEBUG, ("skipping option %"U16_F" in options\n", op));
|
---|
680 | LWIP_HOOK_DHCP6_PARSE_OPTION(ip_current_netif(), dhcp6, dhcp6->state, msg_in,
|
---|
681 | msg_in->msgtype, op, len, q, val_offset);
|
---|
682 | break;
|
---|
683 | }
|
---|
684 | }
|
---|
685 | return ERR_OK;
|
---|
686 | }
|
---|
687 |
|
---|
688 | static void
|
---|
689 | dhcp6_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
|
---|
690 | {
|
---|
691 | struct netif *netif = ip_current_input_netif();
|
---|
692 | struct dhcp6 *dhcp6 = netif_dhcp6_data(netif);
|
---|
693 | struct dhcp6_msg *reply_msg = (struct dhcp6_msg *)p->payload;
|
---|
694 | u8_t msg_type;
|
---|
695 | u32_t xid;
|
---|
696 |
|
---|
697 | LWIP_UNUSED_ARG(arg);
|
---|
698 |
|
---|
699 | /* Caught DHCPv6 message from netif that does not have DHCPv6 enabled? -> not interested */
|
---|
700 | if ((dhcp6 == NULL) || (dhcp6->pcb_allocated == 0)) {
|
---|
701 | goto free_pbuf_and_return;
|
---|
702 | }
|
---|
703 |
|
---|
704 | LWIP_ERROR("invalid server address type", IP_IS_V6(addr), goto free_pbuf_and_return;);
|
---|
705 |
|
---|
706 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("dhcp6_recv(pbuf = %p) from DHCPv6 server %s port %"U16_F"\n", (void *)p,
|
---|
707 | ipaddr_ntoa(addr), port));
|
---|
708 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
|
---|
709 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
|
---|
710 | /* prevent warnings about unused arguments */
|
---|
711 | LWIP_UNUSED_ARG(pcb);
|
---|
712 | LWIP_UNUSED_ARG(addr);
|
---|
713 | LWIP_UNUSED_ARG(port);
|
---|
714 |
|
---|
715 | if (p->len < sizeof(struct dhcp6_msg)) {
|
---|
716 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCPv6 reply message or pbuf too short\n"));
|
---|
717 | goto free_pbuf_and_return;
|
---|
718 | }
|
---|
719 |
|
---|
720 | /* match transaction ID against what we expected */
|
---|
721 | xid = reply_msg->transaction_id[0] << 16;
|
---|
722 | xid |= reply_msg->transaction_id[1] << 8;
|
---|
723 | xid |= reply_msg->transaction_id[2];
|
---|
724 | if (xid != dhcp6->xid) {
|
---|
725 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
|
---|
726 | ("transaction id mismatch reply_msg->xid(%"X32_F")!= dhcp6->xid(%"X32_F")\n", xid, dhcp6->xid));
|
---|
727 | goto free_pbuf_and_return;
|
---|
728 | }
|
---|
729 | /* option fields could be unfold? */
|
---|
730 | if (dhcp6_parse_reply(p, dhcp6) != ERR_OK) {
|
---|
731 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
---|
732 | ("problem unfolding DHCPv6 message - too short on memory?\n"));
|
---|
733 | goto free_pbuf_and_return;
|
---|
734 | }
|
---|
735 |
|
---|
736 | /* read DHCP message type */
|
---|
737 | msg_type = reply_msg->msgtype;
|
---|
738 | /* message type is DHCP6 REPLY? */
|
---|
739 | if (msg_type == DHCP6_REPLY) {
|
---|
740 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("DHCP6_REPLY received\n"));
|
---|
741 | #if LWIP_IPV6_DHCP6_STATELESS
|
---|
742 | /* in info-requesting state? */
|
---|
743 | if (dhcp6->state == DHCP6_STATE_REQUESTING_CONFIG) {
|
---|
744 | dhcp6_set_state(dhcp6, DHCP6_STATE_STATELESS_IDLE, "dhcp6_recv");
|
---|
745 | dhcp6_handle_config_reply(netif, p);
|
---|
746 | } else
|
---|
747 | #endif /* LWIP_IPV6_DHCP6_STATELESS */
|
---|
748 | {
|
---|
749 | /* @todo: handle reply in other states? */
|
---|
750 | }
|
---|
751 | } else {
|
---|
752 | /* @todo: handle other message types */
|
---|
753 | }
|
---|
754 |
|
---|
755 | free_pbuf_and_return:
|
---|
756 | pbuf_free(p);
|
---|
757 | }
|
---|
758 |
|
---|
759 | /**
|
---|
760 | * A DHCPv6 request has timed out.
|
---|
761 | *
|
---|
762 | * The timer that was started with the DHCPv6 request has
|
---|
763 | * timed out, indicating no response was received in time.
|
---|
764 | */
|
---|
765 | static void
|
---|
766 | dhcp6_timeout(struct netif *netif, struct dhcp6 *dhcp6)
|
---|
767 | {
|
---|
768 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp6_timeout()\n"));
|
---|
769 |
|
---|
770 | LWIP_UNUSED_ARG(netif);
|
---|
771 | LWIP_UNUSED_ARG(dhcp6);
|
---|
772 |
|
---|
773 | #if LWIP_IPV6_DHCP6_STATELESS
|
---|
774 | /* back-off period has passed, or server selection timed out */
|
---|
775 | if (dhcp6->state == DHCP6_STATE_REQUESTING_CONFIG) {
|
---|
776 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("dhcp6_timeout(): retrying information request\n"));
|
---|
777 | dhcp6_information_request(netif, dhcp6);
|
---|
778 | }
|
---|
779 | #endif /* LWIP_IPV6_DHCP6_STATELESS */
|
---|
780 | }
|
---|
781 |
|
---|
782 | /**
|
---|
783 | * DHCPv6 timeout handling (this function must be called every 500ms,
|
---|
784 | * see @ref DHCP6_TIMER_MSECS).
|
---|
785 | *
|
---|
786 | * A DHCPv6 server is expected to respond within a short period of time.
|
---|
787 | * This timer checks whether an outstanding DHCPv6 request is timed out.
|
---|
788 | */
|
---|
789 | void
|
---|
790 | dhcp6_tmr(void)
|
---|
791 | {
|
---|
792 | struct netif *netif;
|
---|
793 | /* loop through netif's */
|
---|
794 | NETIF_FOREACH(netif) {
|
---|
795 | struct dhcp6 *dhcp6 = netif_dhcp6_data(netif);
|
---|
796 | /* only act on DHCPv6 configured interfaces */
|
---|
797 | if (dhcp6 != NULL) {
|
---|
798 | /* timer is active (non zero), and is about to trigger now */
|
---|
799 | if (dhcp6->request_timeout > 1) {
|
---|
800 | dhcp6->request_timeout--;
|
---|
801 | } else if (dhcp6->request_timeout == 1) {
|
---|
802 | dhcp6->request_timeout--;
|
---|
803 | /* { dhcp6->request_timeout == 0 } */
|
---|
804 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp6_tmr(): request timeout\n"));
|
---|
805 | /* this client's request timeout triggered */
|
---|
806 | dhcp6_timeout(netif, dhcp6);
|
---|
807 | }
|
---|
808 | }
|
---|
809 | }
|
---|
810 | }
|
---|
811 |
|
---|
812 | #endif /* LWIP_IPV6 && LWIP_IPV6_DHCP6 */
|
---|