1 | /**
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2 | * @file
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3 | * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
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4 | *
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5 | * @see ip_frag.c
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6 | *
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7 | */
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8 |
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9 | /*
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10 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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11 | * All rights reserved.
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12 | *
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13 | * Redistribution and use in source and binary forms, with or without modification,
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14 | * are permitted provided that the following conditions are met:
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15 | *
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16 | * 1. Redistributions of source code must retain the above copyright notice,
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17 | * this list of conditions and the following disclaimer.
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18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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19 | * this list of conditions and the following disclaimer in the documentation
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20 | * and/or other materials provided with the distribution.
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21 | * 3. The name of the author may not be used to endorse or promote products
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22 | * derived from this software without specific prior written permission.
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23 | *
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24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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33 | * OF SUCH DAMAGE.
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34 | *
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35 | * This file is part of the lwIP TCP/IP stack.
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36 | *
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37 | * Author: Adam Dunkels <adam@sics.se>
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38 | *
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39 | */
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40 |
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41 | #include "lwip/opt.h"
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42 | #include "lwip/ip.h"
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43 | #include "lwip/def.h"
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44 | #include "lwip/mem.h"
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45 | #include "lwip/ip_frag.h"
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46 | #include "lwip/inet_chksum.h"
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47 | #include "lwip/netif.h"
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48 | #include "lwip/icmp.h"
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49 | #include "lwip/igmp.h"
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50 | #include "lwip/raw.h"
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51 | #include "lwip/udp.h"
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52 | #include "lwip/tcp_impl.h"
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53 | #include "lwip/snmp.h"
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54 | #include "lwip/dhcp.h"
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55 | #include "lwip/autoip.h"
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56 | #include "lwip/stats.h"
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57 | #include "arch/perf.h"
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58 |
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59 | #include <string.h>
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60 |
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61 | /** Set this to 0 in the rare case of wanting to call an extra function to
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62 | * generate the IP checksum (in contrast to calculating it on-the-fly). */
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63 | #ifndef LWIP_INLINE_IP_CHKSUM
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64 | #define LWIP_INLINE_IP_CHKSUM 1
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65 | #endif
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66 | #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
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67 | #define CHECKSUM_GEN_IP_INLINE 1
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68 | #else
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69 | #define CHECKSUM_GEN_IP_INLINE 0
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70 | #endif
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71 |
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72 | #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
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73 | #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
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74 |
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75 | /** Some defines for DHCP to let link-layer-addressed packets through while the
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76 | * netif is down.
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77 | * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
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78 | * to return 1 if the port is accepted and 0 if the port is not accepted.
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79 | */
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80 | #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
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81 | /* accept DHCP client port and custom port */
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82 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
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83 | || (LWIP_IP_ACCEPT_UDP_PORT(port)))
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84 | #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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85 | /* accept custom port only */
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86 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(port))
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87 | #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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88 | /* accept DHCP client port only */
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89 | #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
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90 | #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
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91 |
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92 | #else /* LWIP_DHCP */
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93 | #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
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94 | #endif /* LWIP_DHCP */
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95 |
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96 | /**
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97 | * The interface that provided the packet for the current callback
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98 | * invocation.
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99 | */
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100 | struct netif *current_netif;
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101 |
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102 | /**
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103 | * Header of the input packet currently being processed.
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104 | */
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105 | const struct ip_hdr *current_header;
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106 | /** Source IP address of current_header */
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107 | ip_addr_t current_iphdr_src;
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108 | /** Destination IP address of current_header */
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109 | ip_addr_t current_iphdr_dest;
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110 |
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111 | /** The IP header ID of the next outgoing IP packet */
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112 | static u16_t ip_id;
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113 |
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114 | /**
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115 | * Finds the appropriate network interface for a given IP address. It
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116 | * searches the list of network interfaces linearly. A match is found
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117 | * if the masked IP address of the network interface equals the masked
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118 | * IP address given to the function.
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119 | *
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120 | * @param dest the destination IP address for which to find the route
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121 | * @return the netif on which to send to reach dest
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122 | */
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123 | struct netif *
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124 | ip_route(ip_addr_t *dest)
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125 | {
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126 | struct netif *netif;
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127 |
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128 | #ifdef LWIP_HOOK_IP4_ROUTE
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129 | netif = LWIP_HOOK_IP4_ROUTE(dest);
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130 | if (netif != NULL) {
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131 | return netif;
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132 | }
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133 | #endif
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134 |
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135 | /* iterate through netifs */
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136 | for (netif = netif_list; netif != NULL; netif = netif->next) {
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137 | /* network mask matches? */
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138 | if (netif_is_up(netif)) {
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139 | if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
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140 | /* return netif on which to forward IP packet */
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141 | return netif;
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142 | }
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143 | }
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144 | }
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145 | if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
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146 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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147 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
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148 | IP_STATS_INC(ip.rterr);
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149 | snmp_inc_ipoutnoroutes();
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150 | return NULL;
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151 | }
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152 | /* no matching netif found, use default netif */
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153 | return netif_default;
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154 | }
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155 |
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156 | #if IP_FORWARD
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157 | /**
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158 | * Determine whether an IP address is in a reserved set of addresses
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159 | * that may not be forwarded, or whether datagrams to that destination
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160 | * may be forwarded.
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161 | * @param p the packet to forward
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162 | * @param dest the destination IP address
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163 | * @return 1: can forward 0: discard
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164 | */
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165 | static int
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166 | ip_canforward(struct pbuf *p)
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167 | {
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168 | u32_t addr = ip4_addr_get_u32(ip_current_dest_addr());
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169 |
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170 | if (p->flags & PBUF_FLAG_LLBCAST) {
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171 | /* don't route link-layer broadcasts */
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172 | return 0;
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173 | }
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174 | if ((p->flags & PBUF_FLAG_LLMCAST) && !IP_MULTICAST(addr)) {
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175 | /* don't route link-layer multicasts unless the destination address is an IP
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176 | multicast address */
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177 | return 0;
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178 | }
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179 | if (IP_EXPERIMENTAL(addr)) {
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180 | return 0;
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181 | }
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182 | if (IP_CLASSA(addr)) {
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183 | u32_t net = addr & IP_CLASSA_NET;
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184 | if ((net == 0) || (net == (IP_LOOPBACKNET << IP_CLASSA_NSHIFT))) {
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185 | /* don't route loopback packets */
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186 | return 0;
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187 | }
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188 | }
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189 | return 1;
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190 | }
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191 |
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192 | /**
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193 | * Forwards an IP packet. It finds an appropriate route for the
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194 | * packet, decrements the TTL value of the packet, adjusts the
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195 | * checksum and outputs the packet on the appropriate interface.
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196 | *
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197 | * @param p the packet to forward (p->payload points to IP header)
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198 | * @param iphdr the IP header of the input packet
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199 | * @param inp the netif on which this packet was received
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200 | */
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201 | static void
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202 | ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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203 | {
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204 | struct netif *netif;
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205 |
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206 | PERF_START;
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207 |
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208 | if (!ip_canforward(p)) {
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209 | goto return_noroute;
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210 | }
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211 |
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212 | /* RFC3927 2.7: do not forward link-local addresses */
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213 | if (ip_addr_islinklocal(¤t_iphdr_dest)) {
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214 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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215 | ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
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216 | ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
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217 | goto return_noroute;
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218 | }
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219 |
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220 | /* Find network interface where to forward this IP packet to. */
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221 | netif = ip_route(¤t_iphdr_dest);
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222 | if (netif == NULL) {
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223 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
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224 | ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
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225 | ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
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226 | /* @todo: send ICMP_DUR_NET? */
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227 | goto return_noroute;
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228 | }
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229 | #if !IP_FORWARD_ALLOW_TX_ON_RX_NETIF
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230 | /* Do not forward packets onto the same network interface on which
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231 | * they arrived. */
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232 | if (netif == inp) {
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233 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
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234 | goto return_noroute;
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235 | }
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236 | #endif /* IP_FORWARD_ALLOW_TX_ON_RX_NETIF */
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237 |
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238 | /* decrement TTL */
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239 | IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
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240 | /* send ICMP if TTL == 0 */
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241 | if (IPH_TTL(iphdr) == 0) {
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242 | snmp_inc_ipinhdrerrors();
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243 | #if LWIP_ICMP
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244 | /* Don't send ICMP messages in response to ICMP messages */
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245 | if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
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246 | icmp_time_exceeded(p, ICMP_TE_TTL);
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247 | }
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248 | #endif /* LWIP_ICMP */
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249 | return;
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250 | }
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251 |
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252 | /* Incrementally update the IP checksum. */
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253 | if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
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254 | IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
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255 | } else {
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256 | IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
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257 | }
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258 |
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259 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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260 | ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
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261 | ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
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262 |
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263 | IP_STATS_INC(ip.fw);
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264 | IP_STATS_INC(ip.xmit);
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265 | snmp_inc_ipforwdatagrams();
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266 |
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267 | PERF_STOP("ip_forward");
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268 | /* don't fragment if interface has mtu set to 0 [loopif] */
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269 | if (netif->mtu && (p->tot_len > netif->mtu)) {
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270 | if ((IPH_OFFSET(iphdr) & PP_NTOHS(IP_DF)) == 0) {
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271 | #if IP_FRAG
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272 | ip_frag(p, netif, ip_current_dest_addr());
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273 | #else /* IP_FRAG */
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274 | /* @todo: send ICMP Destination Unreacheable code 13 "Communication administratively prohibited"? */
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275 | #endif /* IP_FRAG */
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276 | } else {
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277 | /* send ICMP Destination Unreacheable code 4: "Fragmentation Needed and DF Set" */
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278 | icmp_dest_unreach(p, ICMP_DUR_FRAG);
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279 | }
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280 | return;
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281 | }
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282 | /* transmit pbuf on chosen interface */
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283 | netif->output(netif, p, ¤t_iphdr_dest);
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284 | return;
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285 | return_noroute:
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286 | snmp_inc_ipoutnoroutes();
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287 | }
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288 | #endif /* IP_FORWARD */
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289 |
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290 | /**
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291 | * This function is called by the network interface device driver when
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292 | * an IP packet is received. The function does the basic checks of the
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293 | * IP header such as packet size being at least larger than the header
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294 | * size etc. If the packet was not destined for us, the packet is
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295 | * forwarded (using ip_forward). The IP checksum is always checked.
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296 | *
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297 | * Finally, the packet is sent to the upper layer protocol input function.
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298 | *
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299 | * @param p the received IP packet (p->payload points to IP header)
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300 | * @param inp the netif on which this packet was received
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301 | * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
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302 | * processed, but currently always returns ERR_OK)
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303 | */
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304 | err_t
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305 | ip_input(struct pbuf *p, struct netif *inp)
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306 | {
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307 | struct ip_hdr *iphdr;
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308 | struct netif *netif;
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309 | u16_t iphdr_hlen;
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310 | u16_t iphdr_len;
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311 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING
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312 | int check_ip_src=1;
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313 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
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314 |
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315 | IP_STATS_INC(ip.recv);
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316 | snmp_inc_ipinreceives();
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317 |
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318 | /* identify the IP header */
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319 | iphdr = (struct ip_hdr *)p->payload;
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320 | if (IPH_V(iphdr) != 4) {
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321 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
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322 | ip_debug_print(p);
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323 | pbuf_free(p);
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324 | IP_STATS_INC(ip.err);
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325 | IP_STATS_INC(ip.drop);
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326 | snmp_inc_ipinhdrerrors();
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327 | return ERR_OK;
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328 | }
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329 |
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330 | #ifdef LWIP_HOOK_IP4_INPUT
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331 | if (LWIP_HOOK_IP4_INPUT(p, inp)) {
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332 | /* the packet has been eaten */
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333 | return ERR_OK;
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334 | }
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335 | #endif
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336 |
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337 | /* obtain IP header length in number of 32-bit words */
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338 | iphdr_hlen = IPH_HL(iphdr);
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339 | /* calculate IP header length in bytes */
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340 | iphdr_hlen *= 4;
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341 | /* obtain ip length in bytes */
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342 | iphdr_len = ntohs(IPH_LEN(iphdr));
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343 |
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344 | /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
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345 | if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
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346 | if (iphdr_hlen > p->len) {
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347 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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348 | ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
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349 | iphdr_hlen, p->len));
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350 | }
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351 | if (iphdr_len > p->tot_len) {
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352 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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353 | ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
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354 | iphdr_len, p->tot_len));
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355 | }
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356 | /* free (drop) packet pbufs */
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357 | pbuf_free(p);
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358 | IP_STATS_INC(ip.lenerr);
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359 | IP_STATS_INC(ip.drop);
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360 | snmp_inc_ipindiscards();
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361 | return ERR_OK;
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362 | }
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363 |
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364 | /* verify checksum */
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365 | #if CHECKSUM_CHECK_IP
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366 | if (inet_chksum(iphdr, iphdr_hlen) != 0) {
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367 |
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368 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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369 | ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
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370 | ip_debug_print(p);
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371 | pbuf_free(p);
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372 | IP_STATS_INC(ip.chkerr);
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373 | IP_STATS_INC(ip.drop);
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374 | snmp_inc_ipinhdrerrors();
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375 | return ERR_OK;
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376 | }
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377 | #endif
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378 |
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379 | /* Trim pbuf. This should have been done at the netif layer,
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380 | * but we'll do it anyway just to be sure that its done. */
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381 | pbuf_realloc(p, iphdr_len);
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382 |
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383 | /* copy IP addresses to aligned ip_addr_t */
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384 | ip_addr_copy(current_iphdr_dest, iphdr->dest);
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385 | ip_addr_copy(current_iphdr_src, iphdr->src);
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386 |
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387 | /* match packet against an interface, i.e. is this packet for us? */
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388 | #if LWIP_IGMP
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389 | if (ip_addr_ismulticast(¤t_iphdr_dest)) {
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390 | if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, ¤t_iphdr_dest))) {
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391 | netif = inp;
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392 | } else {
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393 | netif = NULL;
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394 | }
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395 | } else
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396 | #endif /* LWIP_IGMP */
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397 | {
|
---|
398 | /* start trying with inp. if that's not acceptable, start walking the
|
---|
399 | list of configured netifs.
|
---|
400 | 'first' is used as a boolean to mark whether we started walking the list */
|
---|
401 | int first = 1;
|
---|
402 | netif = inp;
|
---|
403 | do {
|
---|
404 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
|
---|
405 | ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
|
---|
406 | ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
|
---|
407 | ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
|
---|
408 | ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
|
---|
409 |
|
---|
410 | /* interface is up and configured? */
|
---|
411 | if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
|
---|
412 | /* unicast to this interface address? */
|
---|
413 | if (ip_addr_cmp(¤t_iphdr_dest, &(netif->ip_addr)) ||
|
---|
414 | /* or broadcast on this interface network address? */
|
---|
415 | ip_addr_isbroadcast(¤t_iphdr_dest, netif)) {
|
---|
416 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
|
---|
417 | netif->name[0], netif->name[1]));
|
---|
418 | /* break out of for loop */
|
---|
419 | break;
|
---|
420 | }
|
---|
421 | #if LWIP_AUTOIP
|
---|
422 | /* connections to link-local addresses must persist after changing
|
---|
423 | the netif's address (RFC3927 ch. 1.9) */
|
---|
424 | if ((netif->autoip != NULL) &&
|
---|
425 | ip_addr_cmp(¤t_iphdr_dest, &(netif->autoip->llipaddr))) {
|
---|
426 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
|
---|
427 | netif->name[0], netif->name[1]));
|
---|
428 | /* break out of for loop */
|
---|
429 | break;
|
---|
430 | }
|
---|
431 | #endif /* LWIP_AUTOIP */
|
---|
432 | }
|
---|
433 | if (first) {
|
---|
434 | first = 0;
|
---|
435 | netif = netif_list;
|
---|
436 | } else {
|
---|
437 | netif = netif->next;
|
---|
438 | }
|
---|
439 | if (netif == inp) {
|
---|
440 | netif = netif->next;
|
---|
441 | }
|
---|
442 | } while(netif != NULL);
|
---|
443 | }
|
---|
444 |
|
---|
445 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING
|
---|
446 | /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
|
---|
447 | * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
|
---|
448 | * According to RFC 1542 section 3.1.1, referred by RFC 2131).
|
---|
449 | *
|
---|
450 | * If you want to accept private broadcast communication while a netif is down,
|
---|
451 | * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
|
---|
452 | *
|
---|
453 | * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
|
---|
454 | */
|
---|
455 | if (netif == NULL) {
|
---|
456 | /* remote port is DHCP server? */
|
---|
457 | if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
|
---|
458 | struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
|
---|
459 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
|
---|
460 | ntohs(udphdr->dest)));
|
---|
461 | if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
|
---|
462 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
|
---|
463 | netif = inp;
|
---|
464 | check_ip_src = 0;
|
---|
465 | }
|
---|
466 | }
|
---|
467 | }
|
---|
468 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
469 |
|
---|
470 | /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
|
---|
471 | #if IP_ACCEPT_LINK_LAYER_ADDRESSING
|
---|
472 | /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
|
---|
473 | if (check_ip_src && !ip_addr_isany(¤t_iphdr_src))
|
---|
474 | #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
|
---|
475 | { if ((ip_addr_isbroadcast(¤t_iphdr_src, inp)) ||
|
---|
476 | (ip_addr_ismulticast(¤t_iphdr_src))) {
|
---|
477 | /* packet source is not valid */
|
---|
478 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
|
---|
479 | /* free (drop) packet pbufs */
|
---|
480 | pbuf_free(p);
|
---|
481 | IP_STATS_INC(ip.drop);
|
---|
482 | snmp_inc_ipinaddrerrors();
|
---|
483 | snmp_inc_ipindiscards();
|
---|
484 | return ERR_OK;
|
---|
485 | }
|
---|
486 | }
|
---|
487 |
|
---|
488 | /* packet not for us? */
|
---|
489 | if (netif == NULL) {
|
---|
490 | /* packet not for us, route or discard */
|
---|
491 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
|
---|
492 | #if IP_FORWARD
|
---|
493 | /* non-broadcast packet? */
|
---|
494 | if (!ip_addr_isbroadcast(¤t_iphdr_dest, inp)) {
|
---|
495 | /* try to forward IP packet on (other) interfaces */
|
---|
496 | ip_forward(p, iphdr, inp);
|
---|
497 | } else
|
---|
498 | #endif /* IP_FORWARD */
|
---|
499 | {
|
---|
500 | snmp_inc_ipinaddrerrors();
|
---|
501 | snmp_inc_ipindiscards();
|
---|
502 | }
|
---|
503 | pbuf_free(p);
|
---|
504 | return ERR_OK;
|
---|
505 | }
|
---|
506 | /* packet consists of multiple fragments? */
|
---|
507 | if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
|
---|
508 | #if IP_REASSEMBLY /* packet fragment reassembly code present? */
|
---|
509 | LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
|
---|
510 | ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
|
---|
511 | /* reassemble the packet*/
|
---|
512 | p = ip_reass(p);
|
---|
513 | /* packet not fully reassembled yet? */
|
---|
514 | if (p == NULL) {
|
---|
515 | return ERR_OK;
|
---|
516 | }
|
---|
517 | iphdr = (struct ip_hdr *)p->payload;
|
---|
518 | #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
|
---|
519 | pbuf_free(p);
|
---|
520 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
|
---|
521 | ntohs(IPH_OFFSET(iphdr))));
|
---|
522 | IP_STATS_INC(ip.opterr);
|
---|
523 | IP_STATS_INC(ip.drop);
|
---|
524 | /* unsupported protocol feature */
|
---|
525 | snmp_inc_ipinunknownprotos();
|
---|
526 | return ERR_OK;
|
---|
527 | #endif /* IP_REASSEMBLY */
|
---|
528 | }
|
---|
529 |
|
---|
530 | #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
|
---|
531 |
|
---|
532 | #if LWIP_IGMP
|
---|
533 | /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
|
---|
534 | if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
|
---|
535 | #else
|
---|
536 | if (iphdr_hlen > IP_HLEN) {
|
---|
537 | #endif /* LWIP_IGMP */
|
---|
538 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
|
---|
539 | pbuf_free(p);
|
---|
540 | IP_STATS_INC(ip.opterr);
|
---|
541 | IP_STATS_INC(ip.drop);
|
---|
542 | /* unsupported protocol feature */
|
---|
543 | snmp_inc_ipinunknownprotos();
|
---|
544 | return ERR_OK;
|
---|
545 | }
|
---|
546 | #endif /* IP_OPTIONS_ALLOWED == 0 */
|
---|
547 |
|
---|
548 | /* send to upper layers */
|
---|
549 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
|
---|
550 | ip_debug_print(p);
|
---|
551 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
|
---|
552 |
|
---|
553 | current_netif = inp;
|
---|
554 | current_header = iphdr;
|
---|
555 |
|
---|
556 | #if LWIP_RAW
|
---|
557 | /* raw input did not eat the packet? */
|
---|
558 | if (raw_input(p, inp) == 0)
|
---|
559 | #endif /* LWIP_RAW */
|
---|
560 | {
|
---|
561 | switch (IPH_PROTO(iphdr)) {
|
---|
562 | #if LWIP_UDP
|
---|
563 | case IP_PROTO_UDP:
|
---|
564 | #if LWIP_UDPLITE
|
---|
565 | case IP_PROTO_UDPLITE:
|
---|
566 | #endif /* LWIP_UDPLITE */
|
---|
567 | snmp_inc_ipindelivers();
|
---|
568 | udp_input(p, inp);
|
---|
569 | break;
|
---|
570 | #endif /* LWIP_UDP */
|
---|
571 | #if LWIP_TCP
|
---|
572 | case IP_PROTO_TCP:
|
---|
573 | snmp_inc_ipindelivers();
|
---|
574 | tcp_input(p, inp);
|
---|
575 | break;
|
---|
576 | #endif /* LWIP_TCP */
|
---|
577 | #if LWIP_ICMP
|
---|
578 | case IP_PROTO_ICMP:
|
---|
579 | snmp_inc_ipindelivers();
|
---|
580 | icmp_input(p, inp);
|
---|
581 | break;
|
---|
582 | #endif /* LWIP_ICMP */
|
---|
583 | #if LWIP_IGMP
|
---|
584 | case IP_PROTO_IGMP:
|
---|
585 | igmp_input(p, inp, ¤t_iphdr_dest);
|
---|
586 | break;
|
---|
587 | #endif /* LWIP_IGMP */
|
---|
588 | default:
|
---|
589 | #if LWIP_ICMP
|
---|
590 | /* send ICMP destination protocol unreachable unless is was a broadcast */
|
---|
591 | if (!ip_addr_isbroadcast(¤t_iphdr_dest, inp) &&
|
---|
592 | !ip_addr_ismulticast(¤t_iphdr_dest)) {
|
---|
593 | p->payload = iphdr;
|
---|
594 | icmp_dest_unreach(p, ICMP_DUR_PROTO);
|
---|
595 | }
|
---|
596 | #endif /* LWIP_ICMP */
|
---|
597 | pbuf_free(p);
|
---|
598 |
|
---|
599 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
|
---|
600 |
|
---|
601 | IP_STATS_INC(ip.proterr);
|
---|
602 | IP_STATS_INC(ip.drop);
|
---|
603 | snmp_inc_ipinunknownprotos();
|
---|
604 | }
|
---|
605 | }
|
---|
606 |
|
---|
607 | current_netif = NULL;
|
---|
608 | current_header = NULL;
|
---|
609 | ip_addr_set_any(¤t_iphdr_src);
|
---|
610 | ip_addr_set_any(¤t_iphdr_dest);
|
---|
611 |
|
---|
612 | return ERR_OK;
|
---|
613 | }
|
---|
614 |
|
---|
615 | /**
|
---|
616 | * Sends an IP packet on a network interface. This function constructs
|
---|
617 | * the IP header and calculates the IP header checksum. If the source
|
---|
618 | * IP address is NULL, the IP address of the outgoing network
|
---|
619 | * interface is filled in as source address.
|
---|
620 | * If the destination IP address is IP_HDRINCL, p is assumed to already
|
---|
621 | * include an IP header and p->payload points to it instead of the data.
|
---|
622 | *
|
---|
623 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
624 | protocol header; if dest == IP_HDRINCL, p already includes an IP
|
---|
625 | header and p->payload points to that IP header)
|
---|
626 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
|
---|
627 | * IP address of the netif used to send is used as source address)
|
---|
628 | * @param dest the destination IP address to send the packet to
|
---|
629 | * @param ttl the TTL value to be set in the IP header
|
---|
630 | * @param tos the TOS value to be set in the IP header
|
---|
631 | * @param proto the PROTOCOL to be set in the IP header
|
---|
632 | * @param netif the netif on which to send this packet
|
---|
633 | * @return ERR_OK if the packet was sent OK
|
---|
634 | * ERR_BUF if p doesn't have enough space for IP/LINK headers
|
---|
635 | * returns errors returned by netif->output
|
---|
636 | *
|
---|
637 | * @note ip_id: RFC791 "some host may be able to simply use
|
---|
638 | * unique identifiers independent of destination"
|
---|
639 | */
|
---|
640 | err_t
|
---|
641 | ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
|
---|
642 | u8_t ttl, u8_t tos,
|
---|
643 | u8_t proto, struct netif *netif)
|
---|
644 | {
|
---|
645 | #if IP_OPTIONS_SEND
|
---|
646 | return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
|
---|
647 | }
|
---|
648 |
|
---|
649 | /**
|
---|
650 | * Same as ip_output_if() but with the possibility to include IP options:
|
---|
651 | *
|
---|
652 | * @ param ip_options pointer to the IP options, copied into the IP header
|
---|
653 | * @ param optlen length of ip_options
|
---|
654 | */
|
---|
655 | err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
|
---|
656 | u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
|
---|
657 | u16_t optlen)
|
---|
658 | {
|
---|
659 | #endif /* IP_OPTIONS_SEND */
|
---|
660 | struct ip_hdr *iphdr;
|
---|
661 | ip_addr_t dest_addr;
|
---|
662 | #if CHECKSUM_GEN_IP_INLINE
|
---|
663 | u32_t chk_sum = 0;
|
---|
664 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
665 |
|
---|
666 | /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
|
---|
667 | gets altered as the packet is passed down the stack */
|
---|
668 | LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
---|
669 |
|
---|
670 | snmp_inc_ipoutrequests();
|
---|
671 |
|
---|
672 | /* Should the IP header be generated or is it already included in p? */
|
---|
673 | if (dest != IP_HDRINCL) {
|
---|
674 | u16_t ip_hlen = IP_HLEN;
|
---|
675 | #if IP_OPTIONS_SEND
|
---|
676 | u16_t optlen_aligned = 0;
|
---|
677 | if (optlen != 0) {
|
---|
678 | #if CHECKSUM_GEN_IP_INLINE
|
---|
679 | int i;
|
---|
680 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
681 | /* round up to a multiple of 4 */
|
---|
682 | optlen_aligned = ((optlen + 3) & ~3);
|
---|
683 | ip_hlen += optlen_aligned;
|
---|
684 | /* First write in the IP options */
|
---|
685 | if (pbuf_header(p, optlen_aligned)) {
|
---|
686 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
|
---|
687 | IP_STATS_INC(ip.err);
|
---|
688 | snmp_inc_ipoutdiscards();
|
---|
689 | return ERR_BUF;
|
---|
690 | }
|
---|
691 | MEMCPY(p->payload, ip_options, optlen);
|
---|
692 | if (optlen < optlen_aligned) {
|
---|
693 | /* zero the remaining bytes */
|
---|
694 | memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
|
---|
695 | }
|
---|
696 | #if CHECKSUM_GEN_IP_INLINE
|
---|
697 | for (i = 0; i < optlen_aligned/2; i++) {
|
---|
698 | chk_sum += ((u16_t*)p->payload)[i];
|
---|
699 | }
|
---|
700 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
701 | }
|
---|
702 | #endif /* IP_OPTIONS_SEND */
|
---|
703 | /* generate IP header */
|
---|
704 | if (pbuf_header(p, IP_HLEN)) {
|
---|
705 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
|
---|
706 |
|
---|
707 | IP_STATS_INC(ip.err);
|
---|
708 | snmp_inc_ipoutdiscards();
|
---|
709 | return ERR_BUF;
|
---|
710 | }
|
---|
711 |
|
---|
712 | iphdr = (struct ip_hdr *)p->payload;
|
---|
713 | LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
|
---|
714 | (p->len >= sizeof(struct ip_hdr)));
|
---|
715 |
|
---|
716 | IPH_TTL_SET(iphdr, ttl);
|
---|
717 | IPH_PROTO_SET(iphdr, proto);
|
---|
718 | #if CHECKSUM_GEN_IP_INLINE
|
---|
719 | chk_sum += LWIP_MAKE_U16(proto, ttl);
|
---|
720 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
721 |
|
---|
722 | /* dest cannot be NULL here */
|
---|
723 | ip_addr_copy(iphdr->dest, *dest);
|
---|
724 | #if CHECKSUM_GEN_IP_INLINE
|
---|
725 | chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
|
---|
726 | chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
|
---|
727 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
728 |
|
---|
729 | IPH_VHL_SET(iphdr, 4, ip_hlen / 4);
|
---|
730 | IPH_TOS_SET(iphdr, tos);
|
---|
731 | #if CHECKSUM_GEN_IP_INLINE
|
---|
732 | chk_sum += LWIP_MAKE_U16(tos, iphdr->_v_hl);
|
---|
733 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
734 | IPH_LEN_SET(iphdr, htons(p->tot_len));
|
---|
735 | #if CHECKSUM_GEN_IP_INLINE
|
---|
736 | chk_sum += iphdr->_len;
|
---|
737 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
738 | IPH_OFFSET_SET(iphdr, 0);
|
---|
739 | IPH_ID_SET(iphdr, htons(ip_id));
|
---|
740 | #if CHECKSUM_GEN_IP_INLINE
|
---|
741 | chk_sum += iphdr->_id;
|
---|
742 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
743 | ++ip_id;
|
---|
744 |
|
---|
745 | if (ip_addr_isany(src)) {
|
---|
746 | ip_addr_copy(iphdr->src, netif->ip_addr);
|
---|
747 | } else {
|
---|
748 | /* src cannot be NULL here */
|
---|
749 | ip_addr_copy(iphdr->src, *src);
|
---|
750 | }
|
---|
751 |
|
---|
752 | #if CHECKSUM_GEN_IP_INLINE
|
---|
753 | chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
|
---|
754 | chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
|
---|
755 | chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
|
---|
756 | chk_sum = (chk_sum >> 16) + chk_sum;
|
---|
757 | chk_sum = ~chk_sum;
|
---|
758 | iphdr->_chksum = chk_sum; /* network order */
|
---|
759 | #else /* CHECKSUM_GEN_IP_INLINE */
|
---|
760 | IPH_CHKSUM_SET(iphdr, 0);
|
---|
761 | #if CHECKSUM_GEN_IP
|
---|
762 | IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
|
---|
763 | #endif
|
---|
764 | #endif /* CHECKSUM_GEN_IP_INLINE */
|
---|
765 | } else {
|
---|
766 | /* IP header already included in p */
|
---|
767 | iphdr = (struct ip_hdr *)p->payload;
|
---|
768 | ip_addr_copy(dest_addr, iphdr->dest);
|
---|
769 | dest = &dest_addr;
|
---|
770 | }
|
---|
771 |
|
---|
772 | IP_STATS_INC(ip.xmit);
|
---|
773 |
|
---|
774 | LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
|
---|
775 | ip_debug_print(p);
|
---|
776 |
|
---|
777 | #if ENABLE_LOOPBACK
|
---|
778 | if (ip_addr_cmp(dest, &netif->ip_addr)) {
|
---|
779 | /* Packet to self, enqueue it for loopback */
|
---|
780 | LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
|
---|
781 | return netif_loop_output(netif, p, dest);
|
---|
782 | }
|
---|
783 | #if LWIP_IGMP
|
---|
784 | if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
|
---|
785 | netif_loop_output(netif, p, dest);
|
---|
786 | }
|
---|
787 | #endif /* LWIP_IGMP */
|
---|
788 | #endif /* ENABLE_LOOPBACK */
|
---|
789 | #if IP_FRAG
|
---|
790 | /* don't fragment if interface has mtu set to 0 [loopif] */
|
---|
791 | if (netif->mtu && (p->tot_len > netif->mtu)) {
|
---|
792 | return ip_frag(p, netif, dest);
|
---|
793 | }
|
---|
794 | #endif /* IP_FRAG */
|
---|
795 |
|
---|
796 | LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
|
---|
797 | return netif->output(netif, p, dest);
|
---|
798 | }
|
---|
799 |
|
---|
800 | /**
|
---|
801 | * Simple interface to ip_output_if. It finds the outgoing network
|
---|
802 | * interface and calls upon ip_output_if to do the actual work.
|
---|
803 | *
|
---|
804 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
805 | protocol header; if dest == IP_HDRINCL, p already includes an IP
|
---|
806 | header and p->payload points to that IP header)
|
---|
807 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
|
---|
808 | * IP address of the netif used to send is used as source address)
|
---|
809 | * @param dest the destination IP address to send the packet to
|
---|
810 | * @param ttl the TTL value to be set in the IP header
|
---|
811 | * @param tos the TOS value to be set in the IP header
|
---|
812 | * @param proto the PROTOCOL to be set in the IP header
|
---|
813 | *
|
---|
814 | * @return ERR_RTE if no route is found
|
---|
815 | * see ip_output_if() for more return values
|
---|
816 | */
|
---|
817 | err_t
|
---|
818 | ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
|
---|
819 | u8_t ttl, u8_t tos, u8_t proto)
|
---|
820 | {
|
---|
821 | struct netif *netif;
|
---|
822 |
|
---|
823 | /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
|
---|
824 | gets altered as the packet is passed down the stack */
|
---|
825 | LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
---|
826 |
|
---|
827 | if ((netif = ip_route(dest)) == NULL) {
|
---|
828 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
829 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
|
---|
830 | IP_STATS_INC(ip.rterr);
|
---|
831 | return ERR_RTE;
|
---|
832 | }
|
---|
833 |
|
---|
834 | return ip_output_if(p, src, dest, ttl, tos, proto, netif);
|
---|
835 | }
|
---|
836 |
|
---|
837 | #if LWIP_NETIF_HWADDRHINT
|
---|
838 | /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
|
---|
839 | * before calling ip_output_if.
|
---|
840 | *
|
---|
841 | * @param p the packet to send (p->payload points to the data, e.g. next
|
---|
842 | protocol header; if dest == IP_HDRINCL, p already includes an IP
|
---|
843 | header and p->payload points to that IP header)
|
---|
844 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
|
---|
845 | * IP address of the netif used to send is used as source address)
|
---|
846 | * @param dest the destination IP address to send the packet to
|
---|
847 | * @param ttl the TTL value to be set in the IP header
|
---|
848 | * @param tos the TOS value to be set in the IP header
|
---|
849 | * @param proto the PROTOCOL to be set in the IP header
|
---|
850 | * @param addr_hint address hint pointer set to netif->addr_hint before
|
---|
851 | * calling ip_output_if()
|
---|
852 | *
|
---|
853 | * @return ERR_RTE if no route is found
|
---|
854 | * see ip_output_if() for more return values
|
---|
855 | */
|
---|
856 | err_t
|
---|
857 | ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
|
---|
858 | u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
|
---|
859 | {
|
---|
860 | struct netif *netif;
|
---|
861 | err_t err;
|
---|
862 |
|
---|
863 | /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
|
---|
864 | gets altered as the packet is passed down the stack */
|
---|
865 | LWIP_ASSERT("p->ref == 1", p->ref == 1);
|
---|
866 |
|
---|
867 | if ((netif = ip_route(dest)) == NULL) {
|
---|
868 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
869 | ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
|
---|
870 | IP_STATS_INC(ip.rterr);
|
---|
871 | return ERR_RTE;
|
---|
872 | }
|
---|
873 |
|
---|
874 | NETIF_SET_HWADDRHINT(netif, addr_hint);
|
---|
875 | err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
|
---|
876 | NETIF_SET_HWADDRHINT(netif, NULL);
|
---|
877 |
|
---|
878 | return err;
|
---|
879 | }
|
---|
880 | #endif /* LWIP_NETIF_HWADDRHINT*/
|
---|
881 |
|
---|
882 | #if IP_DEBUG
|
---|
883 | /* Print an IP header by using LWIP_DEBUGF
|
---|
884 | * @param p an IP packet, p->payload pointing to the IP header
|
---|
885 | */
|
---|
886 | void
|
---|
887 | ip_debug_print(struct pbuf *p)
|
---|
888 | {
|
---|
889 | struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
|
---|
890 |
|
---|
891 | LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
|
---|
892 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
893 | LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
|
---|
894 | IPH_V(iphdr),
|
---|
895 | IPH_HL(iphdr),
|
---|
896 | IPH_TOS(iphdr),
|
---|
897 | ntohs(IPH_LEN(iphdr))));
|
---|
898 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
899 | LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
|
---|
900 | ntohs(IPH_ID(iphdr)),
|
---|
901 | ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
|
---|
902 | ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
|
---|
903 | ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
|
---|
904 | ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
|
---|
905 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
906 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
|
---|
907 | IPH_TTL(iphdr),
|
---|
908 | IPH_PROTO(iphdr),
|
---|
909 | ntohs(IPH_CHKSUM(iphdr))));
|
---|
910 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
911 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
|
---|
912 | ip4_addr1_16(&iphdr->src),
|
---|
913 | ip4_addr2_16(&iphdr->src),
|
---|
914 | ip4_addr3_16(&iphdr->src),
|
---|
915 | ip4_addr4_16(&iphdr->src)));
|
---|
916 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
917 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
|
---|
918 | ip4_addr1_16(&iphdr->dest),
|
---|
919 | ip4_addr2_16(&iphdr->dest),
|
---|
920 | ip4_addr3_16(&iphdr->dest),
|
---|
921 | ip4_addr4_16(&iphdr->dest)));
|
---|
922 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
|
---|
923 | }
|
---|
924 | #endif /* IP_DEBUG */
|
---|