1 | /**
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2 | * @file
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3 | * User Datagram Protocol module
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4 | *
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5 | */
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6 |
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7 | /*
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8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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9 | * All rights reserved.
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10 | *
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11 | * Redistribution and use in source and binary forms, with or without modification,
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12 | * are permitted provided that the following conditions are met:
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13 | *
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14 | * 1. Redistributions of source code must retain the above copyright notice,
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15 | * this list of conditions and the following disclaimer.
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16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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17 | * this list of conditions and the following disclaimer in the documentation
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18 | * and/or other materials provided with the distribution.
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19 | * 3. The name of the author may not be used to endorse or promote products
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20 | * derived from this software without specific prior written permission.
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21 | *
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22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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31 | * OF SUCH DAMAGE.
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32 | *
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33 | * This file is part of the lwIP TCP/IP stack.
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34 | *
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35 | * Author: Adam Dunkels <adam@sics.se>
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36 | *
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37 | */
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38 |
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39 |
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40 | /* udp.c
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41 | *
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42 | * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
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43 | *
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44 | */
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45 |
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46 | /* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
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47 | */
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48 |
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49 | #include "lwip/opt.h"
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50 |
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51 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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52 |
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53 | #include "lwip/udp.h"
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54 | #include "lwip/def.h"
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55 | #include "lwip/memp.h"
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56 | #include "lwip/inet_chksum.h"
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57 | #include "lwip/ip_addr.h"
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58 | #include "lwip/netif.h"
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59 | #include "lwip/icmp.h"
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60 | #include "lwip/stats.h"
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61 | #include "lwip/snmp.h"
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62 | #include "arch/perf.h"
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63 | #include "lwip/dhcp.h"
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64 |
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65 | #include <string.h>
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66 |
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67 | #ifndef UDP_LOCAL_PORT_RANGE_START
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68 | /* From http://www.iana.org/assignments/port-numbers:
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69 | "The Dynamic and/or Private Ports are those from 49152 through 65535" */
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70 | #define UDP_LOCAL_PORT_RANGE_START 0xc000
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71 | #define UDP_LOCAL_PORT_RANGE_END 0xffff
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72 | #define UDP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~UDP_LOCAL_PORT_RANGE_START) + UDP_LOCAL_PORT_RANGE_START)
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73 | #endif
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74 |
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75 | /* last local UDP port */
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76 | static u16_t udp_port = UDP_LOCAL_PORT_RANGE_START;
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77 |
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78 | /* The list of UDP PCBs */
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79 | /* exported in udp.h (was static) */
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80 | struct udp_pcb *udp_pcbs;
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81 |
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82 | /**
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83 | * Initialize this module.
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84 | */
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85 | void
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86 | udp_init(void)
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87 | {
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88 | #if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
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89 | udp_port = UDP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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90 | #endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
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91 | }
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92 |
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93 | /**
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94 | * Allocate a new local UDP port.
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95 | *
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96 | * @return a new (free) local UDP port number
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97 | */
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98 | static u16_t
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99 | udp_new_port(void)
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100 | {
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101 | u16_t n = 0;
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102 | struct udp_pcb *pcb;
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103 |
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104 | again:
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105 | if (udp_port++ == UDP_LOCAL_PORT_RANGE_END) {
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106 | udp_port = UDP_LOCAL_PORT_RANGE_START;
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107 | }
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108 | /* Check all PCBs. */
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109 | for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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110 | if (pcb->local_port == udp_port) {
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111 | if (++n > (UDP_LOCAL_PORT_RANGE_END - UDP_LOCAL_PORT_RANGE_START)) {
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112 | return 0;
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113 | }
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114 | goto again;
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115 | }
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116 | }
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117 | return udp_port;
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118 | #if 0
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119 | struct udp_pcb *ipcb = udp_pcbs;
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120 | while ((ipcb != NULL) && (udp_port != UDP_LOCAL_PORT_RANGE_END)) {
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121 | if (ipcb->local_port == udp_port) {
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122 | /* port is already used by another udp_pcb */
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123 | udp_port++;
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124 | /* restart scanning all udp pcbs */
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125 | ipcb = udp_pcbs;
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126 | } else {
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127 | /* go on with next udp pcb */
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128 | ipcb = ipcb->next;
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129 | }
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130 | }
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131 | if (ipcb != NULL) {
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132 | return 0;
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133 | }
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134 | return udp_port;
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135 | #endif
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136 | }
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137 |
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138 | /**
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139 | * Process an incoming UDP datagram.
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140 | *
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141 | * Given an incoming UDP datagram (as a chain of pbufs) this function
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142 | * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
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143 | * recv function. If no pcb is found or the datagram is incorrect, the
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144 | * pbuf is freed.
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145 | *
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146 | * @param p pbuf to be demultiplexed to a UDP PCB.
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147 | * @param inp network interface on which the datagram was received.
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148 | *
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149 | */
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150 | void
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151 | udp_input(struct pbuf *p, struct netif *inp)
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152 | {
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153 | struct udp_hdr *udphdr;
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154 | struct udp_pcb *pcb, *prev;
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155 | struct udp_pcb *uncon_pcb;
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156 | struct ip_hdr *iphdr;
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157 | u16_t src, dest;
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158 | u8_t local_match;
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159 | u8_t broadcast;
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160 |
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161 | PERF_START;
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162 |
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163 | UDP_STATS_INC(udp.recv);
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164 |
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165 | iphdr = (struct ip_hdr *)p->payload;
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166 |
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167 | /* Check minimum length (IP header + UDP header)
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168 | * and move payload pointer to UDP header */
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169 | if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
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170 | /* drop short packets */
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171 | LWIP_DEBUGF(UDP_DEBUG,
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172 | ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
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173 | UDP_STATS_INC(udp.lenerr);
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174 | UDP_STATS_INC(udp.drop);
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175 | snmp_inc_udpinerrors();
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176 | pbuf_free(p);
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177 | goto end;
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178 | }
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179 |
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180 | udphdr = (struct udp_hdr *)p->payload;
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181 |
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182 | /* is broadcast packet ? */
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183 | broadcast = ip_addr_isbroadcast(¤t_iphdr_dest, inp);
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184 |
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185 | LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
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186 |
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187 | /* convert src and dest ports to host byte order */
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188 | src = ntohs(udphdr->src);
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189 | dest = ntohs(udphdr->dest);
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190 |
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191 | udp_debug_print(udphdr);
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192 |
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193 | /* print the UDP source and destination */
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194 | LWIP_DEBUGF(UDP_DEBUG,
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195 | ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
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196 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
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197 | ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
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198 | ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
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199 | ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
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200 | ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
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201 |
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202 | #if LWIP_DHCP
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203 | pcb = NULL;
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204 | /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
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205 | the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
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206 | if (dest == DHCP_CLIENT_PORT) {
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207 | /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
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208 | if (src == DHCP_SERVER_PORT) {
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209 | if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
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210 | /* accept the packe if
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211 | (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
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212 | - inp->dhcp->pcb->remote == ANY or iphdr->src */
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213 | if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
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214 | ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), ¤t_iphdr_src))) {
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215 | pcb = inp->dhcp->pcb;
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216 | }
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217 | }
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218 | }
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219 | } else
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220 | #endif /* LWIP_DHCP */
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221 | {
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222 | prev = NULL;
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223 | local_match = 0;
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224 | uncon_pcb = NULL;
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225 | /* Iterate through the UDP pcb list for a matching pcb.
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226 | * 'Perfect match' pcbs (connected to the remote port & ip address) are
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227 | * preferred. If no perfect match is found, the first unconnected pcb that
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228 | * matches the local port and ip address gets the datagram. */
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229 | for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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230 | local_match = 0;
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231 | /* print the PCB local and remote address */
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232 | LWIP_DEBUGF(UDP_DEBUG,
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233 | ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
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234 | "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
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235 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
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236 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
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237 | ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
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238 | ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
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239 |
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240 | /* compare PCB local addr+port to UDP destination addr+port */
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241 | if (pcb->local_port == dest) {
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242 | if (
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243 | (!broadcast && ip_addr_isany(&pcb->local_ip)) ||
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244 | ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest) ||
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245 | #if LWIP_IGMP
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246 | ip_addr_ismulticast(¤t_iphdr_dest) ||
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247 | #endif /* LWIP_IGMP */
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248 | #if IP_SOF_BROADCAST_RECV
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249 | (broadcast && ip_get_option(pcb, SOF_BROADCAST) &&
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250 | (ip_addr_isany(&pcb->local_ip) ||
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251 | ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
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252 | #else /* IP_SOF_BROADCAST_RECV */
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253 | (broadcast &&
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254 | (ip_addr_isany(&pcb->local_ip) ||
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255 | ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
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256 | #endif /* IP_SOF_BROADCAST_RECV */
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257 | local_match = 1;
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258 | if ((uncon_pcb == NULL) &&
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259 | ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
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260 | /* the first unconnected matching PCB */
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261 | uncon_pcb = pcb;
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262 | }
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263 | }
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264 | }
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265 | /* compare PCB remote addr+port to UDP source addr+port */
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266 | if ((local_match != 0) &&
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267 | (pcb->remote_port == src) &&
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268 | (ip_addr_isany(&pcb->remote_ip) ||
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269 | ip_addr_cmp(&(pcb->remote_ip), ¤t_iphdr_src))) {
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270 | /* the first fully matching PCB */
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271 | if (prev != NULL) {
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272 | /* move the pcb to the front of udp_pcbs so that is
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273 | found faster next time */
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274 | prev->next = pcb->next;
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275 | pcb->next = udp_pcbs;
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276 | udp_pcbs = pcb;
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277 | } else {
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278 | UDP_STATS_INC(udp.cachehit);
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279 | }
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280 | break;
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281 | }
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282 | prev = pcb;
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283 | }
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284 | /* no fully matching pcb found? then look for an unconnected pcb */
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285 | if (pcb == NULL) {
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286 | pcb = uncon_pcb;
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287 | }
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288 | }
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289 |
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290 | /* Check checksum if this is a match or if it was directed at us. */
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291 | if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, ¤t_iphdr_dest)) {
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292 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
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293 | #if LWIP_UDPLITE
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294 | if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
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295 | /* Do the UDP Lite checksum */
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296 | #if CHECKSUM_CHECK_UDP
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297 | u16_t chklen = ntohs(udphdr->len);
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298 | if (chklen < sizeof(struct udp_hdr)) {
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299 | if (chklen == 0) {
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300 | /* For UDP-Lite, checksum length of 0 means checksum
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301 | over the complete packet (See RFC 3828 chap. 3.1) */
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302 | chklen = p->tot_len;
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303 | } else {
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304 | /* At least the UDP-Lite header must be covered by the
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305 | checksum! (Again, see RFC 3828 chap. 3.1) */
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306 | UDP_STATS_INC(udp.chkerr);
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307 | UDP_STATS_INC(udp.drop);
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308 | snmp_inc_udpinerrors();
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309 | pbuf_free(p);
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310 | goto end;
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311 | }
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312 | }
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313 | if (inet_chksum_pseudo_partial(p, ¤t_iphdr_src, ¤t_iphdr_dest,
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314 | IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
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315 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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316 | ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
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317 | UDP_STATS_INC(udp.chkerr);
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318 | UDP_STATS_INC(udp.drop);
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319 | snmp_inc_udpinerrors();
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320 | pbuf_free(p);
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321 | goto end;
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322 | }
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323 | #endif /* CHECKSUM_CHECK_UDP */
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324 | } else
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325 | #endif /* LWIP_UDPLITE */
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326 | {
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327 | #if CHECKSUM_CHECK_UDP
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328 | if (udphdr->chksum != 0) {
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329 | if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
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330 | IP_PROTO_UDP, p->tot_len) != 0) {
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331 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
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332 | ("udp_input: UDP datagram discarded due to failing checksum\n"));
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333 | UDP_STATS_INC(udp.chkerr);
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334 | UDP_STATS_INC(udp.drop);
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335 | snmp_inc_udpinerrors();
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336 | pbuf_free(p);
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337 | goto end;
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338 | }
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339 | }
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340 | #endif /* CHECKSUM_CHECK_UDP */
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341 | }
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342 | if(pbuf_header(p, -UDP_HLEN)) {
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343 | /* Can we cope with this failing? Just assert for now */
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344 | LWIP_ASSERT("pbuf_header failed\n", 0);
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345 | UDP_STATS_INC(udp.drop);
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346 | snmp_inc_udpinerrors();
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347 | pbuf_free(p);
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348 | goto end;
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349 | }
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350 | if (pcb != NULL) {
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351 | snmp_inc_udpindatagrams();
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352 | #if SO_REUSE && SO_REUSE_RXTOALL
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353 | if ((broadcast || ip_addr_ismulticast(¤t_iphdr_dest)) &&
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354 | ip_get_option(pcb, SOF_REUSEADDR)) {
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355 | /* pass broadcast- or multicast packets to all multicast pcbs
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356 | if SOF_REUSEADDR is set on the first match */
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357 | struct udp_pcb *mpcb;
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358 | u8_t p_header_changed = 0;
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359 | for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
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360 | if (mpcb != pcb) {
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361 | /* compare PCB local addr+port to UDP destination addr+port */
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362 | if ((mpcb->local_port == dest) &&
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363 | ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
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364 | ip_addr_cmp(&(mpcb->local_ip), ¤t_iphdr_dest) ||
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365 | #if LWIP_IGMP
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366 | ip_addr_ismulticast(¤t_iphdr_dest) ||
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367 | #endif /* LWIP_IGMP */
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368 | #if IP_SOF_BROADCAST_RECV
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369 | (broadcast && ip_get_option(mpcb, SOF_BROADCAST)))) {
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370 | #else /* IP_SOF_BROADCAST_RECV */
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371 | (broadcast))) {
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372 | #endif /* IP_SOF_BROADCAST_RECV */
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373 | /* pass a copy of the packet to all local matches */
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374 | if (mpcb->recv != NULL) {
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375 | struct pbuf *q;
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376 | /* for that, move payload to IP header again */
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377 | if (p_header_changed == 0) {
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378 | pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
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379 | p_header_changed = 1;
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380 | }
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381 | q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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382 | if (q != NULL) {
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383 | err_t err = pbuf_copy(q, p);
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384 | if (err == ERR_OK) {
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385 | /* move payload to UDP data */
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386 | pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
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387 | mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
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388 | }
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389 | }
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390 | }
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---|
391 | }
|
---|
392 | }
|
---|
393 | }
|
---|
394 | if (p_header_changed) {
|
---|
395 | /* and move payload to UDP data again */
|
---|
396 | pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
|
---|
397 | }
|
---|
398 | }
|
---|
399 | #endif /* SO_REUSE && SO_REUSE_RXTOALL */
|
---|
400 | /* callback */
|
---|
401 | if (pcb->recv != NULL) {
|
---|
402 | /* now the recv function is responsible for freeing p */
|
---|
403 | pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
|
---|
404 | } else {
|
---|
405 | /* no recv function registered? then we have to free the pbuf! */
|
---|
406 | pbuf_free(p);
|
---|
407 | goto end;
|
---|
408 | }
|
---|
409 | } else {
|
---|
410 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
|
---|
411 |
|
---|
412 | #if LWIP_ICMP
|
---|
413 | /* No match was found, send ICMP destination port unreachable unless
|
---|
414 | destination address was broadcast/multicast. */
|
---|
415 | if (!broadcast &&
|
---|
416 | !ip_addr_ismulticast(¤t_iphdr_dest)) {
|
---|
417 | /* move payload pointer back to ip header */
|
---|
418 | pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
|
---|
419 | LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
|
---|
420 | icmp_dest_unreach(p, ICMP_DUR_PORT);
|
---|
421 | }
|
---|
422 | #endif /* LWIP_ICMP */
|
---|
423 | UDP_STATS_INC(udp.proterr);
|
---|
424 | UDP_STATS_INC(udp.drop);
|
---|
425 | snmp_inc_udpnoports();
|
---|
426 | pbuf_free(p);
|
---|
427 | }
|
---|
428 | } else {
|
---|
429 | pbuf_free(p);
|
---|
430 | }
|
---|
431 | end:
|
---|
432 | PERF_STOP("udp_input");
|
---|
433 | }
|
---|
434 |
|
---|
435 | /**
|
---|
436 | * Send data using UDP.
|
---|
437 | *
|
---|
438 | * @param pcb UDP PCB used to send the data.
|
---|
439 | * @param p chain of pbuf's to be sent.
|
---|
440 | *
|
---|
441 | * The datagram will be sent to the current remote_ip & remote_port
|
---|
442 | * stored in pcb. If the pcb is not bound to a port, it will
|
---|
443 | * automatically be bound to a random port.
|
---|
444 | *
|
---|
445 | * @return lwIP error code.
|
---|
446 | * - ERR_OK. Successful. No error occured.
|
---|
447 | * - ERR_MEM. Out of memory.
|
---|
448 | * - ERR_RTE. Could not find route to destination address.
|
---|
449 | * - More errors could be returned by lower protocol layers.
|
---|
450 | *
|
---|
451 | * @see udp_disconnect() udp_sendto()
|
---|
452 | */
|
---|
453 | err_t
|
---|
454 | udp_send(struct udp_pcb *pcb, struct pbuf *p)
|
---|
455 | {
|
---|
456 | /* send to the packet using remote ip and port stored in the pcb */
|
---|
457 | return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
|
---|
458 | }
|
---|
459 |
|
---|
460 | #if LWIP_CHECKSUM_ON_COPY
|
---|
461 | /** Same as udp_send() but with checksum
|
---|
462 | */
|
---|
463 | err_t
|
---|
464 | udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
|
---|
465 | u8_t have_chksum, u16_t chksum)
|
---|
466 | {
|
---|
467 | /* send to the packet using remote ip and port stored in the pcb */
|
---|
468 | return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
|
---|
469 | have_chksum, chksum);
|
---|
470 | }
|
---|
471 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
472 |
|
---|
473 | /**
|
---|
474 | * Send data to a specified address using UDP.
|
---|
475 | *
|
---|
476 | * @param pcb UDP PCB used to send the data.
|
---|
477 | * @param p chain of pbuf's to be sent.
|
---|
478 | * @param dst_ip Destination IP address.
|
---|
479 | * @param dst_port Destination UDP port.
|
---|
480 | *
|
---|
481 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
---|
482 | *
|
---|
483 | * If the PCB already has a remote address association, it will
|
---|
484 | * be restored after the data is sent.
|
---|
485 | *
|
---|
486 | * @return lwIP error code (@see udp_send for possible error codes)
|
---|
487 | *
|
---|
488 | * @see udp_disconnect() udp_send()
|
---|
489 | */
|
---|
490 | err_t
|
---|
491 | udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
|
---|
492 | ip_addr_t *dst_ip, u16_t dst_port)
|
---|
493 | {
|
---|
494 | #if LWIP_CHECKSUM_ON_COPY
|
---|
495 | return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
|
---|
496 | }
|
---|
497 |
|
---|
498 | /** Same as udp_sendto(), but with checksum */
|
---|
499 | err_t
|
---|
500 | udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
---|
501 | u16_t dst_port, u8_t have_chksum, u16_t chksum)
|
---|
502 | {
|
---|
503 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
504 | struct netif *netif;
|
---|
505 |
|
---|
506 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
|
---|
507 |
|
---|
508 | /* find the outgoing network interface for this packet */
|
---|
509 | #if LWIP_IGMP
|
---|
510 | netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
|
---|
511 | #else
|
---|
512 | netif = ip_route(dst_ip);
|
---|
513 | #endif /* LWIP_IGMP */
|
---|
514 |
|
---|
515 | /* no outgoing network interface could be found? */
|
---|
516 | if (netif == NULL) {
|
---|
517 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
518 | ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
|
---|
519 | UDP_STATS_INC(udp.rterr);
|
---|
520 | return ERR_RTE;
|
---|
521 | }
|
---|
522 | #if LWIP_CHECKSUM_ON_COPY
|
---|
523 | return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
|
---|
524 | #else /* LWIP_CHECKSUM_ON_COPY */
|
---|
525 | return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
|
---|
526 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
527 | }
|
---|
528 |
|
---|
529 | /**
|
---|
530 | * Send data to a specified address using UDP.
|
---|
531 | * The netif used for sending can be specified.
|
---|
532 | *
|
---|
533 | * This function exists mainly for DHCP, to be able to send UDP packets
|
---|
534 | * on a netif that is still down.
|
---|
535 | *
|
---|
536 | * @param pcb UDP PCB used to send the data.
|
---|
537 | * @param p chain of pbuf's to be sent.
|
---|
538 | * @param dst_ip Destination IP address.
|
---|
539 | * @param dst_port Destination UDP port.
|
---|
540 | * @param netif the netif used for sending.
|
---|
541 | *
|
---|
542 | * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
|
---|
543 | *
|
---|
544 | * @return lwIP error code (@see udp_send for possible error codes)
|
---|
545 | *
|
---|
546 | * @see udp_disconnect() udp_send()
|
---|
547 | */
|
---|
548 | err_t
|
---|
549 | udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
|
---|
550 | ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
|
---|
551 | {
|
---|
552 | #if LWIP_CHECKSUM_ON_COPY
|
---|
553 | return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
|
---|
554 | }
|
---|
555 |
|
---|
556 | /** Same as udp_sendto_if(), but with checksum */
|
---|
557 | err_t
|
---|
558 | udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
|
---|
559 | u16_t dst_port, struct netif *netif, u8_t have_chksum,
|
---|
560 | u16_t chksum)
|
---|
561 | {
|
---|
562 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
563 | struct udp_hdr *udphdr;
|
---|
564 | ip_addr_t *src_ip;
|
---|
565 | err_t err;
|
---|
566 | struct pbuf *q; /* q will be sent down the stack */
|
---|
567 |
|
---|
568 | #if IP_SOF_BROADCAST
|
---|
569 | /* broadcast filter? */
|
---|
570 | if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
|
---|
571 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
|
---|
572 | ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
|
---|
573 | return ERR_VAL;
|
---|
574 | }
|
---|
575 | #endif /* IP_SOF_BROADCAST */
|
---|
576 |
|
---|
577 | /* if the PCB is not yet bound to a port, bind it here */
|
---|
578 | if (pcb->local_port == 0) {
|
---|
579 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
|
---|
580 | err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
|
---|
581 | if (err != ERR_OK) {
|
---|
582 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
|
---|
583 | return err;
|
---|
584 | }
|
---|
585 | }
|
---|
586 |
|
---|
587 | /* not enough space to add an UDP header to first pbuf in given p chain? */
|
---|
588 | if (pbuf_header(p, UDP_HLEN)) {
|
---|
589 | /* allocate header in a separate new pbuf */
|
---|
590 | q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
|
---|
591 | /* new header pbuf could not be allocated? */
|
---|
592 | if (q == NULL) {
|
---|
593 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
|
---|
594 | return ERR_MEM;
|
---|
595 | }
|
---|
596 | if (p->tot_len != 0) {
|
---|
597 | /* chain header q in front of given pbuf p (only if p contains data) */
|
---|
598 | pbuf_chain(q, p);
|
---|
599 | }
|
---|
600 | /* first pbuf q points to header pbuf */
|
---|
601 | LWIP_DEBUGF(UDP_DEBUG,
|
---|
602 | ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
|
---|
603 | } else {
|
---|
604 | /* adding space for header within p succeeded */
|
---|
605 | /* first pbuf q equals given pbuf */
|
---|
606 | q = p;
|
---|
607 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
|
---|
608 | }
|
---|
609 | LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
|
---|
610 | (q->len >= sizeof(struct udp_hdr)));
|
---|
611 | /* q now represents the packet to be sent */
|
---|
612 | udphdr = (struct udp_hdr *)q->payload;
|
---|
613 | udphdr->src = htons(pcb->local_port);
|
---|
614 | udphdr->dest = htons(dst_port);
|
---|
615 | /* in UDP, 0 checksum means 'no checksum' */
|
---|
616 | udphdr->chksum = 0x0000;
|
---|
617 |
|
---|
618 | /* Multicast Loop? */
|
---|
619 | #if LWIP_IGMP
|
---|
620 | if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
|
---|
621 | q->flags |= PBUF_FLAG_MCASTLOOP;
|
---|
622 | }
|
---|
623 | #endif /* LWIP_IGMP */
|
---|
624 |
|
---|
625 |
|
---|
626 | /* PCB local address is IP_ANY_ADDR? */
|
---|
627 | if (ip_addr_isany(&pcb->local_ip)) {
|
---|
628 | /* use outgoing network interface IP address as source address */
|
---|
629 | src_ip = &(netif->ip_addr);
|
---|
630 | } else {
|
---|
631 | /* check if UDP PCB local IP address is correct
|
---|
632 | * this could be an old address if netif->ip_addr has changed */
|
---|
633 | if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
|
---|
634 | /* local_ip doesn't match, drop the packet */
|
---|
635 | if (q != p) {
|
---|
636 | /* free the header pbuf */
|
---|
637 | pbuf_free(q);
|
---|
638 | q = NULL;
|
---|
639 | /* p is still referenced by the caller, and will live on */
|
---|
640 | }
|
---|
641 | return ERR_VAL;
|
---|
642 | }
|
---|
643 | /* use UDP PCB local IP address as source address */
|
---|
644 | src_ip = &(pcb->local_ip);
|
---|
645 | }
|
---|
646 |
|
---|
647 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
|
---|
648 |
|
---|
649 | #if LWIP_UDPLITE
|
---|
650 | /* UDP Lite protocol? */
|
---|
651 | if (pcb->flags & UDP_FLAGS_UDPLITE) {
|
---|
652 | u16_t chklen, chklen_hdr;
|
---|
653 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
|
---|
654 | /* set UDP message length in UDP header */
|
---|
655 | chklen_hdr = chklen = pcb->chksum_len_tx;
|
---|
656 | if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
|
---|
657 | if (chklen != 0) {
|
---|
658 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
|
---|
659 | }
|
---|
660 | /* For UDP-Lite, checksum length of 0 means checksum
|
---|
661 | over the complete packet. (See RFC 3828 chap. 3.1)
|
---|
662 | At least the UDP-Lite header must be covered by the
|
---|
663 | checksum, therefore, if chksum_len has an illegal
|
---|
664 | value, we generate the checksum over the complete
|
---|
665 | packet to be safe. */
|
---|
666 | chklen_hdr = 0;
|
---|
667 | chklen = q->tot_len;
|
---|
668 | }
|
---|
669 | udphdr->len = htons(chklen_hdr);
|
---|
670 | /* calculate checksum */
|
---|
671 | #if CHECKSUM_GEN_UDP
|
---|
672 | udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
|
---|
673 | IP_PROTO_UDPLITE, q->tot_len,
|
---|
674 | #if !LWIP_CHECKSUM_ON_COPY
|
---|
675 | chklen);
|
---|
676 | #else /* !LWIP_CHECKSUM_ON_COPY */
|
---|
677 | (have_chksum ? UDP_HLEN : chklen));
|
---|
678 | if (have_chksum) {
|
---|
679 | u32_t acc;
|
---|
680 | acc = udphdr->chksum + (u16_t)~(chksum);
|
---|
681 | udphdr->chksum = FOLD_U32T(acc);
|
---|
682 | }
|
---|
683 | #endif /* !LWIP_CHECKSUM_ON_COPY */
|
---|
684 |
|
---|
685 | /* chksum zero must become 0xffff, as zero means 'no checksum' */
|
---|
686 | if (udphdr->chksum == 0x0000) {
|
---|
687 | udphdr->chksum = 0xffff;
|
---|
688 | }
|
---|
689 | #endif /* CHECKSUM_GEN_UDP */
|
---|
690 | /* output to IP */
|
---|
691 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
|
---|
692 | NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
|
---|
693 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
|
---|
694 | NETIF_SET_HWADDRHINT(netif, NULL);
|
---|
695 | } else
|
---|
696 | #endif /* LWIP_UDPLITE */
|
---|
697 | { /* UDP */
|
---|
698 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
|
---|
699 | udphdr->len = htons(q->tot_len);
|
---|
700 | /* calculate checksum */
|
---|
701 | #if CHECKSUM_GEN_UDP
|
---|
702 | if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
|
---|
703 | u16_t udpchksum;
|
---|
704 | #if LWIP_CHECKSUM_ON_COPY
|
---|
705 | if (have_chksum) {
|
---|
706 | u32_t acc;
|
---|
707 | udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
|
---|
708 | q->tot_len, UDP_HLEN);
|
---|
709 | acc = udpchksum + (u16_t)~(chksum);
|
---|
710 | udpchksum = FOLD_U32T(acc);
|
---|
711 | } else
|
---|
712 | #endif /* LWIP_CHECKSUM_ON_COPY */
|
---|
713 | {
|
---|
714 | udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
|
---|
715 | }
|
---|
716 |
|
---|
717 | /* chksum zero must become 0xffff, as zero means 'no checksum' */
|
---|
718 | if (udpchksum == 0x0000) {
|
---|
719 | udpchksum = 0xffff;
|
---|
720 | }
|
---|
721 | udphdr->chksum = udpchksum;
|
---|
722 | }
|
---|
723 | #endif /* CHECKSUM_GEN_UDP */
|
---|
724 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
|
---|
725 | LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
|
---|
726 | /* output to IP */
|
---|
727 | NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
|
---|
728 | err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
|
---|
729 | NETIF_SET_HWADDRHINT(netif, NULL);
|
---|
730 | }
|
---|
731 | /* TODO: must this be increased even if error occured? */
|
---|
732 | snmp_inc_udpoutdatagrams();
|
---|
733 |
|
---|
734 | /* did we chain a separate header pbuf earlier? */
|
---|
735 | if (q != p) {
|
---|
736 | /* free the header pbuf */
|
---|
737 | pbuf_free(q);
|
---|
738 | q = NULL;
|
---|
739 | /* p is still referenced by the caller, and will live on */
|
---|
740 | }
|
---|
741 |
|
---|
742 | UDP_STATS_INC(udp.xmit);
|
---|
743 | return err;
|
---|
744 | }
|
---|
745 |
|
---|
746 | /**
|
---|
747 | * Bind an UDP PCB.
|
---|
748 | *
|
---|
749 | * @param pcb UDP PCB to be bound with a local address ipaddr and port.
|
---|
750 | * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
|
---|
751 | * bind to all local interfaces.
|
---|
752 | * @param port local UDP port to bind with. Use 0 to automatically bind
|
---|
753 | * to a random port between UDP_LOCAL_PORT_RANGE_START and
|
---|
754 | * UDP_LOCAL_PORT_RANGE_END.
|
---|
755 | *
|
---|
756 | * ipaddr & port are expected to be in the same byte order as in the pcb.
|
---|
757 | *
|
---|
758 | * @return lwIP error code.
|
---|
759 | * - ERR_OK. Successful. No error occured.
|
---|
760 | * - ERR_USE. The specified ipaddr and port are already bound to by
|
---|
761 | * another UDP PCB.
|
---|
762 | *
|
---|
763 | * @see udp_disconnect()
|
---|
764 | */
|
---|
765 | err_t
|
---|
766 | udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
767 | {
|
---|
768 | struct udp_pcb *ipcb;
|
---|
769 | u8_t rebind;
|
---|
770 |
|
---|
771 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
|
---|
772 | ip_addr_debug_print(UDP_DEBUG, ipaddr);
|
---|
773 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
|
---|
774 |
|
---|
775 | rebind = 0;
|
---|
776 | /* Check for double bind and rebind of the same pcb */
|
---|
777 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
|
---|
778 | /* is this UDP PCB already on active list? */
|
---|
779 | if (pcb == ipcb) {
|
---|
780 | /* pcb may occur at most once in active list */
|
---|
781 | LWIP_ASSERT("rebind == 0", rebind == 0);
|
---|
782 | /* pcb already in list, just rebind */
|
---|
783 | rebind = 1;
|
---|
784 | }
|
---|
785 |
|
---|
786 | /* By default, we don't allow to bind to a port that any other udp
|
---|
787 | PCB is alread bound to, unless *all* PCBs with that port have tha
|
---|
788 | REUSEADDR flag set. */
|
---|
789 | #if SO_REUSE
|
---|
790 | else if (!ip_get_option(pcb, SOF_REUSEADDR) &&
|
---|
791 | !ip_get_option(ipcb, SOF_REUSEADDR)) {
|
---|
792 | #else /* SO_REUSE */
|
---|
793 | /* port matches that of PCB in list and REUSEADDR not set -> reject */
|
---|
794 | else {
|
---|
795 | #endif /* SO_REUSE */
|
---|
796 | if ((ipcb->local_port == port) &&
|
---|
797 | /* IP address matches, or one is IP_ADDR_ANY? */
|
---|
798 | (ip_addr_isany(&(ipcb->local_ip)) ||
|
---|
799 | ip_addr_isany(ipaddr) ||
|
---|
800 | ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
|
---|
801 | /* other PCB already binds to this local IP and port */
|
---|
802 | LWIP_DEBUGF(UDP_DEBUG,
|
---|
803 | ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
|
---|
804 | return ERR_USE;
|
---|
805 | }
|
---|
806 | }
|
---|
807 | }
|
---|
808 |
|
---|
809 | ip_addr_set(&pcb->local_ip, ipaddr);
|
---|
810 |
|
---|
811 | /* no port specified? */
|
---|
812 | if (port == 0) {
|
---|
813 | port = udp_new_port();
|
---|
814 | if (port == 0) {
|
---|
815 | /* no more ports available in local range */
|
---|
816 | LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
|
---|
817 | return ERR_USE;
|
---|
818 | }
|
---|
819 | }
|
---|
820 | pcb->local_port = port;
|
---|
821 | snmp_insert_udpidx_tree(pcb);
|
---|
822 | /* pcb not active yet? */
|
---|
823 | if (rebind == 0) {
|
---|
824 | /* place the PCB on the active list if not already there */
|
---|
825 | pcb->next = udp_pcbs;
|
---|
826 | udp_pcbs = pcb;
|
---|
827 | }
|
---|
828 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
829 | ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
|
---|
830 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
|
---|
831 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
|
---|
832 | pcb->local_port));
|
---|
833 | return ERR_OK;
|
---|
834 | }
|
---|
835 | /**
|
---|
836 | * Connect an UDP PCB.
|
---|
837 | *
|
---|
838 | * This will associate the UDP PCB with the remote address.
|
---|
839 | *
|
---|
840 | * @param pcb UDP PCB to be connected with remote address ipaddr and port.
|
---|
841 | * @param ipaddr remote IP address to connect with.
|
---|
842 | * @param port remote UDP port to connect with.
|
---|
843 | *
|
---|
844 | * @return lwIP error code
|
---|
845 | *
|
---|
846 | * ipaddr & port are expected to be in the same byte order as in the pcb.
|
---|
847 | *
|
---|
848 | * The udp pcb is bound to a random local port if not already bound.
|
---|
849 | *
|
---|
850 | * @see udp_disconnect()
|
---|
851 | */
|
---|
852 | err_t
|
---|
853 | udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
854 | {
|
---|
855 | struct udp_pcb *ipcb;
|
---|
856 |
|
---|
857 | if (pcb->local_port == 0) {
|
---|
858 | err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
|
---|
859 | if (err != ERR_OK) {
|
---|
860 | return err;
|
---|
861 | }
|
---|
862 | }
|
---|
863 |
|
---|
864 | ip_addr_set(&pcb->remote_ip, ipaddr);
|
---|
865 | pcb->remote_port = port;
|
---|
866 | pcb->flags |= UDP_FLAGS_CONNECTED;
|
---|
867 | /** TODO: this functionality belongs in upper layers */
|
---|
868 | #ifdef LWIP_UDP_TODO
|
---|
869 | /* Nail down local IP for netconn_addr()/getsockname() */
|
---|
870 | if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
|
---|
871 | struct netif *netif;
|
---|
872 |
|
---|
873 | if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
|
---|
874 | LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
|
---|
875 | UDP_STATS_INC(udp.rterr);
|
---|
876 | return ERR_RTE;
|
---|
877 | }
|
---|
878 | /** TODO: this will bind the udp pcb locally, to the interface which
|
---|
879 | is used to route output packets to the remote address. However, we
|
---|
880 | might want to accept incoming packets on any interface! */
|
---|
881 | pcb->local_ip = netif->ip_addr;
|
---|
882 | } else if (ip_addr_isany(&pcb->remote_ip)) {
|
---|
883 | pcb->local_ip.addr = 0;
|
---|
884 | }
|
---|
885 | #endif
|
---|
886 | LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
887 | ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
|
---|
888 | ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
|
---|
889 | ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
|
---|
890 | pcb->local_port));
|
---|
891 |
|
---|
892 | /* Insert UDP PCB into the list of active UDP PCBs. */
|
---|
893 | for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
|
---|
894 | if (pcb == ipcb) {
|
---|
895 | /* already on the list, just return */
|
---|
896 | return ERR_OK;
|
---|
897 | }
|
---|
898 | }
|
---|
899 | /* PCB not yet on the list, add PCB now */
|
---|
900 | pcb->next = udp_pcbs;
|
---|
901 | udp_pcbs = pcb;
|
---|
902 | return ERR_OK;
|
---|
903 | }
|
---|
904 |
|
---|
905 | /**
|
---|
906 | * Disconnect a UDP PCB
|
---|
907 | *
|
---|
908 | * @param pcb the udp pcb to disconnect.
|
---|
909 | */
|
---|
910 | void
|
---|
911 | udp_disconnect(struct udp_pcb *pcb)
|
---|
912 | {
|
---|
913 | /* reset remote address association */
|
---|
914 | ip_addr_set_any(&pcb->remote_ip);
|
---|
915 | pcb->remote_port = 0;
|
---|
916 | /* mark PCB as unconnected */
|
---|
917 | pcb->flags &= ~UDP_FLAGS_CONNECTED;
|
---|
918 | }
|
---|
919 |
|
---|
920 | /**
|
---|
921 | * Set a receive callback for a UDP PCB
|
---|
922 | *
|
---|
923 | * This callback will be called when receiving a datagram for the pcb.
|
---|
924 | *
|
---|
925 | * @param pcb the pcb for wich to set the recv callback
|
---|
926 | * @param recv function pointer of the callback function
|
---|
927 | * @param recv_arg additional argument to pass to the callback function
|
---|
928 | */
|
---|
929 | void
|
---|
930 | udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
|
---|
931 | {
|
---|
932 | /* remember recv() callback and user data */
|
---|
933 | pcb->recv = recv;
|
---|
934 | pcb->recv_arg = recv_arg;
|
---|
935 | }
|
---|
936 |
|
---|
937 | /**
|
---|
938 | * Remove an UDP PCB.
|
---|
939 | *
|
---|
940 | * @param pcb UDP PCB to be removed. The PCB is removed from the list of
|
---|
941 | * UDP PCB's and the data structure is freed from memory.
|
---|
942 | *
|
---|
943 | * @see udp_new()
|
---|
944 | */
|
---|
945 | void
|
---|
946 | udp_remove(struct udp_pcb *pcb)
|
---|
947 | {
|
---|
948 | struct udp_pcb *pcb2;
|
---|
949 |
|
---|
950 | snmp_delete_udpidx_tree(pcb);
|
---|
951 | /* pcb to be removed is first in list? */
|
---|
952 | if (udp_pcbs == pcb) {
|
---|
953 | /* make list start at 2nd pcb */
|
---|
954 | udp_pcbs = udp_pcbs->next;
|
---|
955 | /* pcb not 1st in list */
|
---|
956 | } else {
|
---|
957 | for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
|
---|
958 | /* find pcb in udp_pcbs list */
|
---|
959 | if (pcb2->next != NULL && pcb2->next == pcb) {
|
---|
960 | /* remove pcb from list */
|
---|
961 | pcb2->next = pcb->next;
|
---|
962 | }
|
---|
963 | }
|
---|
964 | }
|
---|
965 | memp_free(MEMP_UDP_PCB, pcb);
|
---|
966 | }
|
---|
967 |
|
---|
968 | /**
|
---|
969 | * Create a UDP PCB.
|
---|
970 | *
|
---|
971 | * @return The UDP PCB which was created. NULL if the PCB data structure
|
---|
972 | * could not be allocated.
|
---|
973 | *
|
---|
974 | * @see udp_remove()
|
---|
975 | */
|
---|
976 | struct udp_pcb *
|
---|
977 | udp_new(void)
|
---|
978 | {
|
---|
979 | struct udp_pcb *pcb;
|
---|
980 | pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
|
---|
981 | /* could allocate UDP PCB? */
|
---|
982 | if (pcb != NULL) {
|
---|
983 | /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
|
---|
984 | * which means checksum is generated over the whole datagram per default
|
---|
985 | * (recommended as default by RFC 3828). */
|
---|
986 | /* initialize PCB to all zeroes */
|
---|
987 | memset(pcb, 0, sizeof(struct udp_pcb));
|
---|
988 | pcb->ttl = UDP_TTL;
|
---|
989 | }
|
---|
990 | return pcb;
|
---|
991 | }
|
---|
992 |
|
---|
993 | #if UDP_DEBUG
|
---|
994 | /**
|
---|
995 | * Print UDP header information for debug purposes.
|
---|
996 | *
|
---|
997 | * @param udphdr pointer to the udp header in memory.
|
---|
998 | */
|
---|
999 | void
|
---|
1000 | udp_debug_print(struct udp_hdr *udphdr)
|
---|
1001 | {
|
---|
1002 | LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
|
---|
1003 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
1004 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
---|
1005 | ntohs(udphdr->src), ntohs(udphdr->dest)));
|
---|
1006 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
1007 | LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
|
---|
1008 | ntohs(udphdr->len), ntohs(udphdr->chksum)));
|
---|
1009 | LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
|
---|
1010 | }
|
---|
1011 | #endif /* UDP_DEBUG */
|
---|
1012 |
|
---|
1013 | #endif /* LWIP_UDP */
|
---|