1 | /*
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2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | * Author: Adam Dunkels <adam@sics.se>
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30 | *
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31 | */
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32 |
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33 |
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34 |
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35 | /* ip.c
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36 | *
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37 | * This is the code for the IP layer for IPv6.
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38 | *
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39 | */
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40 |
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41 |
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42 | #include "lwip/opt.h"
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43 |
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44 | #include "lwip/def.h"
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45 | #include "lwip/mem.h"
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46 | #include "lwip/ip.h"
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47 | #include "lwip/inet.h"
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48 | #include "lwip/netif.h"
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49 | #include "lwip/icmp.h"
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50 | #include "lwip/udp.h"
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51 | #include "lwip/tcp_impl.h"
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52 |
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53 | #include "lwip/stats.h"
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54 |
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55 | #include "arch/perf.h"
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56 |
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57 | /* ip_init:
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58 | *
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59 | * Initializes the IP layer.
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60 | */
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61 |
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62 | void
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63 | ip_init(void)
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64 | {
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65 | }
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66 |
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67 | /* ip_route:
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68 | *
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69 | * Finds the appropriate network interface for a given IP address. It searches the
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70 | * list of network interfaces linearly. A match is found if the masked IP address of
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71 | * the network interface equals the masked IP address given to the function.
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72 | */
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73 |
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74 | struct netif *
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75 | ip_route(struct ip_addr *dest)
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76 | {
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77 | struct netif *netif;
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78 |
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79 | for(netif = netif_list; netif != NULL; netif = netif->next) {
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80 | if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
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81 | return netif;
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82 | }
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83 | }
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84 |
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85 | return netif_default;
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86 | }
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87 |
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88 | /* ip_forward:
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89 | *
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90 | * Forwards an IP packet. It finds an appropriate route for the packet, decrements
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91 | * the TTL value of the packet, adjusts the checksum and outputs the packet on the
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92 | * appropriate interface.
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93 | */
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94 |
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95 | static void
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96 | ip_forward(struct pbuf *p, struct ip_hdr *iphdr)
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97 | {
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98 | struct netif *netif;
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99 |
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100 | PERF_START;
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101 |
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102 | if ((netif = ip_route((struct ip_addr *)&(iphdr->dest))) == NULL) {
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103 |
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104 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: no forwarding route found for "));
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105 | #if IP_DEBUG
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106 | ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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107 | #endif /* IP_DEBUG */
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108 | LWIP_DEBUGF(IP_DEBUG, ("\n"));
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109 | pbuf_free(p);
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110 | return;
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111 | }
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112 | /* Decrement TTL and send ICMP if ttl == 0. */
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113 | if (--iphdr->hoplim == 0) {
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114 | #if LWIP_ICMP
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115 | /* Don't send ICMP messages in response to ICMP messages */
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116 | if (iphdr->nexthdr != IP_PROTO_ICMP) {
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117 | icmp_time_exceeded(p, ICMP_TE_TTL);
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118 | }
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119 | #endif /* LWIP_ICMP */
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120 | pbuf_free(p);
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121 | return;
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122 | }
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123 |
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124 | /* Incremental update of the IP checksum. */
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125 | /* if (iphdr->chksum >= htons(0xffff - 0x100)) {
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126 | iphdr->chksum += htons(0x100) + 1;
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127 | } else {
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128 | iphdr->chksum += htons(0x100);
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129 | }*/
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130 |
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131 |
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132 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to "));
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133 | #if IP_DEBUG
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134 | ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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135 | #endif /* IP_DEBUG */
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136 | LWIP_DEBUGF(IP_DEBUG, ("\n"));
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137 |
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138 | IP_STATS_INC(ip.fw);
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139 | IP_STATS_INC(ip.xmit);
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140 |
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141 | PERF_STOP("ip_forward");
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142 |
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143 | netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
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144 | }
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145 |
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146 | /* ip_input:
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147 | *
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148 | * This function is called by the network interface device driver when an IP packet is
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149 | * received. The function does the basic checks of the IP header such as packet size
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150 | * being at least larger than the header size etc. If the packet was not destined for
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151 | * us, the packet is forwarded (using ip_forward). The IP checksum is always checked.
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152 | *
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153 | * Finally, the packet is sent to the upper layer protocol input function.
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154 | */
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155 |
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156 | void
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157 | ip_input(struct pbuf *p, struct netif *inp) {
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158 | struct ip_hdr *iphdr;
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159 | struct netif *netif;
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160 |
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161 |
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162 | PERF_START;
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163 |
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164 | #if IP_DEBUG
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165 | ip_debug_print(p);
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166 | #endif /* IP_DEBUG */
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167 |
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168 |
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169 | IP_STATS_INC(ip.recv);
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170 |
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171 | /* identify the IP header */
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172 | iphdr = p->payload;
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173 |
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174 |
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175 | if (iphdr->v != 6) {
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176 | LWIP_DEBUGF(IP_DEBUG, ("IP packet dropped due to bad version number\n"));
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177 | #if IP_DEBUG
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178 | ip_debug_print(p);
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179 | #endif /* IP_DEBUG */
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180 | pbuf_free(p);
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181 | IP_STATS_INC(ip.err);
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182 | IP_STATS_INC(ip.drop);
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183 | return;
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184 | }
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185 |
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186 | /* is this packet for us? */
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187 | for(netif = netif_list; netif != NULL; netif = netif->next) {
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188 | #if IP_DEBUG
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189 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest "));
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190 | ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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191 | LWIP_DEBUGF(IP_DEBUG, ("netif->ip_addr "));
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192 | ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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193 | LWIP_DEBUGF(IP_DEBUG, ("\n"));
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194 | #endif /* IP_DEBUG */
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195 | if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr))) {
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196 | break;
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197 | }
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198 | }
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199 |
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200 |
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201 | if (netif == NULL) {
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202 | /* packet not for us, route or discard */
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203 | #if IP_FORWARD
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204 | ip_forward(p, iphdr);
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205 | #endif
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206 | pbuf_free(p);
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207 | return;
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208 | }
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209 |
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210 | pbuf_realloc(p, IP_HLEN + ntohs(iphdr->len));
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211 |
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212 | /* send to upper layers */
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213 | #if IP_DEBUG
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214 | /* LWIP_DEBUGF("ip_input: \n");
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215 | ip_debug_print(p);
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216 | LWIP_DEBUGF("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
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217 | #endif /* IP_DEBUG */
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218 |
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219 | if(pbuf_header(p, -IP_HLEN)) {
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220 | LWIP_ASSERT("Can't move over header in packet", 0);
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221 | return;
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222 | }
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223 |
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224 | switch (iphdr->nexthdr) {
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225 | case IP_PROTO_UDP:
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226 | udp_input(p, inp);
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227 | break;
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228 | case IP_PROTO_TCP:
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229 | tcp_input(p, inp);
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230 | break;
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231 | #if LWIP_ICMP
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232 | case IP_PROTO_ICMP:
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233 | icmp_input(p, inp);
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234 | break;
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235 | #endif /* LWIP_ICMP */
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236 | default:
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237 | #if LWIP_ICMP
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238 | /* send ICMP destination protocol unreachable */
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239 | icmp_dest_unreach(p, ICMP_DUR_PROTO);
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240 | #endif /* LWIP_ICMP */
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241 | pbuf_free(p);
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242 | LWIP_DEBUGF(IP_DEBUG, ("Unsupported transport protocol %"U16_F"\n",
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243 | iphdr->nexthdr));
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244 |
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245 | IP_STATS_INC(ip.proterr);
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246 | IP_STATS_INC(ip.drop);
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247 | }
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248 | PERF_STOP("ip_input");
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249 | }
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250 |
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251 |
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252 | /* ip_output_if:
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253 | *
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254 | * Sends an IP packet on a network interface. This function constructs the IP header
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255 | * and calculates the IP header checksum. If the source IP address is NULL,
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256 | * the IP address of the outgoing network interface is filled in as source address.
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257 | */
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258 |
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259 | err_t
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260 | ip_output_if (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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261 | u8_t ttl,
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262 | u8_t proto, struct netif *netif)
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263 | {
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264 | struct ip_hdr *iphdr;
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265 |
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266 | PERF_START;
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267 |
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268 | LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
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269 | if (pbuf_header(p, IP_HLEN)) {
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270 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: not enough room for IP header in pbuf\n"));
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271 | IP_STATS_INC(ip.err);
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272 |
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273 | return ERR_BUF;
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274 | }
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275 | LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
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276 |
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277 | iphdr = p->payload;
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278 |
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279 |
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280 | if (dest != IP_HDRINCL) {
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281 | LWIP_DEBUGF(IP_DEBUG, ("!IP_HDRLINCL\n"));
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282 | iphdr->hoplim = ttl;
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283 | iphdr->nexthdr = proto;
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284 | iphdr->len = htons(p->tot_len - IP_HLEN);
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285 | ip_addr_set(&(iphdr->dest), dest);
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286 |
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287 | iphdr->v = 6;
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288 |
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289 | if (ip_addr_isany(src)) {
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290 | ip_addr_set(&(iphdr->src), &(netif->ip_addr));
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291 | } else {
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292 | ip_addr_set(&(iphdr->src), src);
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293 | }
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294 |
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295 | } else {
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296 | dest = &(iphdr->dest);
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297 | }
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298 |
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299 | IP_STATS_INC(ip.xmit);
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300 |
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301 | LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c (len %"U16_F")\n", netif->name[0], netif->name[1], p->tot_len));
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302 | #if IP_DEBUG
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303 | ip_debug_print(p);
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304 | #endif /* IP_DEBUG */
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305 |
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306 | PERF_STOP("ip_output_if");
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307 | return netif->output(netif, p, dest);
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308 | }
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309 |
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310 | /* ip_output:
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311 | *
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312 | * Simple interface to ip_output_if. It finds the outgoing network interface and
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313 | * calls upon ip_output_if to do the actual work.
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314 | */
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315 |
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316 | err_t
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317 | ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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318 | u8_t ttl, u8_t proto)
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319 | {
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320 | struct netif *netif;
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321 | if ((netif = ip_route(dest)) == NULL) {
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322 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
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323 | IP_STATS_INC(ip.rterr);
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324 | return ERR_RTE;
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325 | }
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326 |
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327 | return ip_output_if (p, src, dest, ttl, proto, netif);
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328 | }
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329 |
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330 | #if LWIP_NETIF_HWADDRHINT
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331 | err_t
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332 | ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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333 | u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
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334 | {
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335 | struct netif *netif;
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336 | err_t err;
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337 |
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338 | if ((netif = ip_route(dest)) == NULL) {
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339 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
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340 | IP_STATS_INC(ip.rterr);
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341 | return ERR_RTE;
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342 | }
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343 |
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344 | LWIP_NETIF_HWADDRHINT(netif, addr_hint);
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345 | err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
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346 | LWIP_NETIF_HWADDRHINT(netif, NULL);
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347 |
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348 | return err;
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349 | }
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350 | #endif /* LWIP_NETIF_HWADDRHINT*/
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351 |
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352 | #if IP_DEBUG
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353 | void
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354 | ip_debug_print(struct pbuf *p)
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355 | {
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356 | struct ip_hdr *iphdr = p->payload;
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357 |
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358 | LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
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359 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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360 | LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" | %"X16_F"%"X16_F" | %"X16_F"%"X16_F" | (v, traffic class, flow label)\n",
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361 | iphdr->v,
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362 | iphdr->tclass1, iphdr->tclass2,
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363 | iphdr->flow1, iphdr->flow2));
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364 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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365 | LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" | %2"U16_F" | %2"U16_F" | (len, nexthdr, hoplim)\n",
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366 | ntohs(iphdr->len),
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367 | iphdr->nexthdr,
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368 | iphdr->hoplim));
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369 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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370 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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371 | (ntohl(iphdr->src.addr[0]) >> 16) & 0xffff,
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372 | ntohl(iphdr->src.addr[0]) & 0xffff));
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373 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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374 | (ntohl(iphdr->src.addr[1]) >> 16) & 0xffff,
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375 | ntohl(iphdr->src.addr[1]) & 0xffff));
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376 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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377 | (ntohl(iphdr->src.addr[2]) >> 16) & 0xffff,
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378 | ntohl(iphdr->src.addr[2]) & 0xffff));
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379 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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380 | (ntohl(iphdr->src.addr[3]) >> 16) & 0xffff,
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381 | ntohl(iphdr->src.addr[3]) & 0xffff));
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382 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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383 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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384 | (ntohl(iphdr->dest.addr[0]) >> 16) & 0xffff,
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385 | ntohl(iphdr->dest.addr[0]) & 0xffff));
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386 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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387 | (ntohl(iphdr->dest.addr[1]) >> 16) & 0xffff,
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388 | ntohl(iphdr->dest.addr[1]) & 0xffff));
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389 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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390 | (ntohl(iphdr->dest.addr[2]) >> 16) & 0xffff,
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391 | ntohl(iphdr->dest.addr[2]) & 0xffff));
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392 | LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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393 | (ntohl(iphdr->dest.addr[3]) >> 16) & 0xffff,
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394 | ntohl(iphdr->dest.addr[3]) & 0xffff));
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395 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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396 | }
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397 | #endif /* IP_DEBUG */
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