BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file |
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3 | * DHCPv6 - RFC 3315 |
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4 | */ |
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5 | |||
6 | /* |
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7 | * Copyright (c) 2017 Simon Goldschmidt |
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8 | * All rights reserved. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without modification, |
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11 | * are permitted provided that the following conditions are met: |
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12 | * |
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13 | * 1. Redistributions of source code must retain the above copyright notice, |
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14 | * this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
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16 | * this list of conditions and the following disclaimer in the documentation |
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17 | * and/or other materials provided with the distribution. |
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18 | * 3. The name of the author may not be used to endorse or promote products |
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19 | * derived from this software without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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30 | * OF SUCH DAMAGE. |
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31 | * |
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32 | * This file is part of the lwIP TCP/IP stack. |
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33 | * |
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34 | * Author: Simon Goldschmidt <goldsimon@gmx.de> |
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35 | */ |
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36 | |||
37 | #include "lwip/opt.h" |
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38 | |||
39 | #if LWIP_IPV6 && LWIP_IPV6_DHCP6 /* don't build if not configured for use in lwipopts.h */ |
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40 | |||
41 | #include "lwip/dhcp6.h" |
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42 | #include "lwip/prot/dhcp6.h" |
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43 | #include "lwip/def.h" |
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44 | #include "lwip/udp.h" |
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45 | |||
46 | #include <string.h> |
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47 | |||
48 | #ifdef LWIP_HOOK_FILENAME |
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49 | #include LWIP_HOOK_FILENAME |
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50 | #endif |
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51 | #ifndef LWIP_HOOK_DHCP6_APPEND_OPTIONS |
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52 | #define LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, state, msg, msg_type) |
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53 | #endif |
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54 | #ifndef LWIP_HOOK_DHCP6_PARSE_OPTION |
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55 | #define LWIP_HOOK_DHCP6_PARSE_OPTION(netif, dhcp6, state, msg, msg_type, option, len, pbuf, offset) |
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56 | #endif |
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57 | |||
58 | const ip_addr_t dhcp6_All_DHCP_Relay_Agents_and_Servers = IPADDR6_INIT_HOST(0xFF020000, 0, 0, 0x00010002); |
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59 | const ip_addr_t dhcp6_All_DHCP_Servers = IPADDR6_INIT_HOST(0xFF020000, 0, 0, 0x00010003); |
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60 | |||
61 | static struct udp_pcb *dhcp6_pcb; |
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62 | static u8_t dhcp6_pcb_refcount; |
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63 | |||
64 | |||
65 | /* receive, unfold, parse and free incoming messages */ |
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66 | 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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67 | |||
68 | /** Ensure DHCP PCB is allocated and bound */ |
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69 | static err_t |
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70 | dhcp6_inc_pcb_refcount(void) |
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71 | { |
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72 | if (dhcp6_pcb_refcount == 0) { |
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73 | LWIP_ASSERT("dhcp6_inc_pcb_refcount(): memory leak", dhcp6_pcb == NULL); |
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74 | |||
75 | /* allocate UDP PCB */ |
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76 | dhcp6_pcb = udp_new(); |
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77 | |||
78 | if (dhcp6_pcb == NULL) { |
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79 | return ERR_MEM; |
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80 | } |
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81 | |||
82 | ip_set_option(dhcp6_pcb, SOF_BROADCAST); |
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83 | |||
84 | /* set up local and remote port for the pcb -> listen on all interfaces on all src/dest IPs */ |
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85 | udp_bind(dhcp6_pcb, IP6_ADDR_ANY, DHCP6_CLIENT_PORT); |
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86 | udp_recv(dhcp6_pcb, dhcp6_recv, NULL); |
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87 | } |
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88 | |||
89 | dhcp6_pcb_refcount++; |
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90 | |||
91 | return ERR_OK; |
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92 | } |
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93 | |||
94 | /** Free DHCP PCB if the last netif stops using it */ |
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95 | static void |
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96 | dhcp6_dec_pcb_refcount(void) |
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97 | { |
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98 | LWIP_ASSERT("dhcp6_pcb_refcount(): refcount error", (dhcp6_pcb_refcount > 0)); |
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99 | dhcp6_pcb_refcount--; |
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100 | |||
101 | if (dhcp6_pcb_refcount == 0) { |
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102 | udp_remove(dhcp6_pcb); |
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103 | dhcp6_pcb = NULL; |
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104 | } |
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105 | } |
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106 | |||
107 | /** |
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108 | * @ingroup dhcp6 |
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109 | * Set a statically allocated struct dhcp6 to work with. |
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110 | * Using this prevents dhcp6_start to allocate it using mem_malloc. |
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111 | * |
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112 | * @param netif the netif for which to set the struct dhcp |
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113 | * @param dhcp6 (uninitialised) dhcp6 struct allocated by the application |
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114 | */ |
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115 | void |
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116 | dhcp6_set_struct(struct netif *netif, struct dhcp6 *dhcp6) |
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117 | { |
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118 | LWIP_ASSERT("netif != NULL", netif != NULL); |
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119 | LWIP_ASSERT("dhcp6 != NULL", dhcp6 != NULL); |
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120 | LWIP_ASSERT("netif already has a struct dhcp6 set", netif_dhcp6_data(netif) == NULL); |
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121 | |||
122 | /* clear data structure */ |
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123 | memset(dhcp6, 0, sizeof(struct dhcp6)); |
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124 | /* dhcp_set_state(&dhcp, DHCP_STATE_OFF); */ |
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125 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, dhcp6); |
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126 | } |
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127 | |||
128 | /** |
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129 | * @ingroup dhcp6 |
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130 | * Removes a struct dhcp6 from a netif. |
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131 | * |
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132 | * ATTENTION: Only use this when not using dhcp6_set_struct() to allocate the |
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133 | * struct dhcp6 since the memory is passed back to the heap. |
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134 | * |
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135 | * @param netif the netif from which to remove the struct dhcp |
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136 | */ |
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137 | void dhcp6_cleanup(struct netif *netif) |
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138 | { |
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139 | LWIP_ASSERT("netif != NULL", netif != NULL); |
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140 | |||
141 | if (netif_dhcp6_data(netif) != NULL) { |
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142 | mem_free(netif_dhcp6_data(netif)); |
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143 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, NULL); |
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144 | } |
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145 | } |
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146 | |||
147 | static struct dhcp6* |
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148 | dhcp6_get_struct(struct netif *netif, const char *dbg_requester) |
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149 | { |
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150 | struct dhcp6 *dhcp6 = netif_dhcp6_data(netif); |
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151 | if (dhcp6 == NULL) { |
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152 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: mallocing new DHCPv6 client\n", dbg_requester)); |
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153 | dhcp6 = (struct dhcp6 *)mem_malloc(sizeof(struct dhcp6)); |
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154 | if (dhcp6 == NULL) { |
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155 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: could not allocate dhcp6\n", dbg_requester)); |
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156 | return NULL; |
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157 | } |
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158 | |||
159 | /* clear data structure, this implies DHCP6_STATE_OFF */ |
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160 | memset(dhcp6, 0, sizeof(struct dhcp6)); |
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161 | /* store this dhcp6 client in the netif */ |
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162 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, dhcp6); |
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163 | } else { |
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164 | /* already has DHCP6 client attached */ |
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165 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("%s: using existing DHCPv6 client\n", dbg_requester)); |
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166 | } |
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167 | |||
168 | if (!dhcp6->pcb_allocated) { |
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169 | if (dhcp6_inc_pcb_refcount() != ERR_OK) { /* ensure DHCP6 PCB is allocated */ |
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170 | mem_free(dhcp6); |
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171 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP6, NULL); |
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172 | return NULL; |
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173 | } |
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174 | LWIP_DEBUGF(DHCP6_DEBUG | LWIP_DBG_TRACE, ("%s: allocated dhcp6", dbg_requester)); |
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175 | dhcp6->pcb_allocated = 1; |
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176 | } |
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177 | return dhcp6; |
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178 | } |
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179 | |||
180 | static u32_t |
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181 | dhcp6_create_next_xid(struct netif *netif, struct dhcp6 dhcp6) |
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182 | { |
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183 | LWIP_UNUSED_ARG(netif); |
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184 | LWIP_UNUSED_ARG(dhcp6); |
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185 | } |
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186 | |||
187 | #if LWIP_IPV6_DHCP6_STATELESS |
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188 | static err_t |
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189 | dhcp_information_request(struct netif *netif, struct dhcp6 *dhcp6) |
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190 | { |
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191 | struct dhcp *dhcp = netif_dhcp_data(netif); |
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192 | err_t result = ERR_OK; |
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193 | u16_t msecs; |
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194 | u8_t i; |
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195 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n")); |
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196 | ip4_addr_set_any(&dhcp->offered_ip_addr); |
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197 | dhcp_set_state(dhcp, DHCP_STATE_SELECTING); |
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198 | /* create and initialize the DHCP message header */ |
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199 | result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER); |
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200 | if (result == ERR_OK) { |
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201 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n")); |
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202 | |||
203 | dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN); |
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204 | dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif)); |
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205 | |||
206 | dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, LWIP_ARRAYSIZE(dhcp_discover_request_options)); |
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207 | for (i = 0; i < LWIP_ARRAYSIZE(dhcp_discover_request_options); i++) { |
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208 | dhcp_option_byte(dhcp, dhcp_discover_request_options[i]); |
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209 | } |
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210 | LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, DHCP_STATE_SELECTING, dhcp->msg_out, DHCP_DISCOVER); |
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211 | dhcp_option_trailer(dhcp); |
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212 | |||
213 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n")); |
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214 | udp_sendto_if_src(dhcp_pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif, IP4_ADDR_ANY); |
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215 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n")); |
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216 | dhcp_delete_msg(dhcp); |
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217 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n")); |
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218 | } else { |
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219 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n")); |
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220 | } |
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221 | if (dhcp->tries < 255) { |
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222 | dhcp->tries++; |
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223 | } |
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224 | #if LWIP_DHCP_AUTOIP_COOP |
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225 | if (dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) { |
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226 | dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON; |
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227 | autoip_start(netif); |
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228 | } |
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229 | #endif /* LWIP_DHCP_AUTOIP_COOP */ |
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230 | msecs = (u16_t)((dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000); |
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231 | dhcp->request_timeout = (u16_t)((msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS); |
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232 | LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs)); |
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233 | return result; |
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234 | } |
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235 | |||
236 | static err_t |
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237 | dhcp6_request_config(struct netif *netif) |
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238 | { |
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239 | struct dhcp6 *dhcp6; |
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240 | |||
241 | LWIP_ASSERT("netif != NULL", netif != NULL); |
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242 | |||
243 | dhcp6 = dhcp6_get_struct(netif, "dhcp6_request_config()"); |
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244 | if (dhcp6 == NULL) { |
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245 | return ERR_MEM; |
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246 | } |
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247 | |||
248 | /* if state is not idle, set a flag to send an information-request later? */ |
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249 | if (dhcp6->state != DHCP6_STATE_OFF) { |
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250 | dhcp6->request_config_pending = 1; |
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251 | return ERR_OK; |
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252 | } |
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253 | |||
254 | /* send Information-request and wait for answer; setup receive timeout */ |
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255 | dhcp_information_request(netif, dhcp6); |
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256 | |||
257 | return ERR_OK; |
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258 | } |
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259 | #endif /* LWIP_IPV6_DHCP6_STATELESS */ |
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260 | |||
261 | void |
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262 | dhcp6_nd6_ra_trigger(struct netif *netif, u8_t managed_addr_config, u8_t other_config) |
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263 | { |
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264 | LWIP_UNUSED_ARG(managed_addr_config); |
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265 | LWIP_UNUSED_ARG(other_config); |
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266 | |||
267 | #if LWIP_IPV6_DHCP6_STATELESS |
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268 | if (other_config) { |
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269 | dhcp6_request_config(netif); |
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270 | } |
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271 | #endif /* LWIP_IPV6_DHCP6_STATELESS */ |
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272 | } |
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273 | |||
274 | static void |
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275 | dhcp6_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) |
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276 | { |
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277 | LWIP_UNUSED_ARG(arg); |
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278 | LWIP_UNUSED_ARG(pcb); |
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279 | LWIP_UNUSED_ARG(p); |
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280 | LWIP_UNUSED_ARG(addr); |
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281 | LWIP_UNUSED_ARG(port); |
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282 | |||
283 | } |
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284 | |||
285 | #endif /* LWIP_IPV6 && LWIP_IPV6_DHCP6 */ |