1 | /**
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2 | * @file
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3 | * Implementation of raw protocol PCBs for low-level handling of
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4 | * different types of protocols besides (or overriding) those
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5 | * already available in lwIP.\n
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6 | * See also @ref raw_raw
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7 | *
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8 | * @defgroup raw_raw RAW
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9 | * @ingroup callbackstyle_api
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10 | * Implementation of raw protocol PCBs for low-level handling of
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11 | * different types of protocols besides (or overriding) those
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12 | * already available in lwIP.\n
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13 | * @see @ref api
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14 | */
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15 |
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16 | /*
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17 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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18 | * All rights reserved.
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19 | *
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20 | * Redistribution and use in source and binary forms, with or without modification,
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21 | * are permitted provided that the following conditions are met:
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22 | *
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23 | * 1. Redistributions of source code must retain the above copyright notice,
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24 | * this list of conditions and the following disclaimer.
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25 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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26 | * this list of conditions and the following disclaimer in the documentation
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27 | * and/or other materials provided with the distribution.
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28 | * 3. The name of the author may not be used to endorse or promote products
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29 | * derived from this software without specific prior written permission.
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30 | *
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31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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32 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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33 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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34 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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35 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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36 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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39 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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40 | * OF SUCH DAMAGE.
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41 | *
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42 | * This file is part of the lwIP TCP/IP stack.
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43 | *
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44 | * Author: Adam Dunkels <adam@sics.se>
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45 | *
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46 | */
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47 |
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48 | #include "lwip/opt.h"
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49 |
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50 | #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
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51 |
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52 | #include "lwip/def.h"
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53 | #include "lwip/memp.h"
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54 | #include "lwip/ip_addr.h"
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55 | #include "lwip/netif.h"
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56 | #include "lwip/raw.h"
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57 | #include "lwip/priv/raw_priv.h"
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58 | #include "lwip/stats.h"
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59 | #include "lwip/ip6.h"
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60 | #include "lwip/ip6_addr.h"
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61 | #include "lwip/inet_chksum.h"
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62 |
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63 | #include <string.h>
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64 |
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65 | /** The list of RAW PCBs */
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66 | static struct raw_pcb *raw_pcbs;
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67 |
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68 | static u8_t
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69 | raw_input_local_match(struct raw_pcb *pcb, u8_t broadcast)
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70 | {
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71 | LWIP_UNUSED_ARG(broadcast); /* in IPv6 only case */
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72 |
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73 | /* check if PCB is bound to specific netif */
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74 | if ((pcb->netif_idx != NETIF_NO_INDEX) &&
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75 | (pcb->netif_idx != netif_get_index(ip_data.current_input_netif))) {
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76 | return 0;
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77 | }
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78 |
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79 | #if LWIP_IPV4 && LWIP_IPV6
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80 | /* Dual-stack: PCBs listening to any IP type also listen to any IP address */
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81 | if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
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82 | #if IP_SOF_BROADCAST_RECV
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83 | if ((broadcast != 0) && !ip_get_option(pcb, SOF_BROADCAST)) {
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84 | return 0;
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85 | }
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86 | #endif /* IP_SOF_BROADCAST_RECV */
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87 | return 1;
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88 | }
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89 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
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90 |
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91 | /* Only need to check PCB if incoming IP version matches PCB IP version */
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92 | if (IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ip_current_dest_addr())) {
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93 | #if LWIP_IPV4
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94 | /* Special case: IPv4 broadcast: receive all broadcasts
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95 | * Note: broadcast variable can only be 1 if it is an IPv4 broadcast */
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96 | if (broadcast != 0) {
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97 | #if IP_SOF_BROADCAST_RECV
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98 | if (ip_get_option(pcb, SOF_BROADCAST))
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99 | #endif /* IP_SOF_BROADCAST_RECV */
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100 | {
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101 | if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) {
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102 | return 1;
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103 | }
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104 | }
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105 | } else
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106 | #endif /* LWIP_IPV4 */
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107 | /* Handle IPv4 and IPv6: catch all or exact match */
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108 | if (ip_addr_isany(&pcb->local_ip) ||
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109 | ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) {
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110 | return 1;
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111 | }
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112 | }
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113 |
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114 | return 0;
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115 | }
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116 |
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117 | /**
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118 | * Determine if in incoming IP packet is covered by a RAW PCB
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119 | * and if so, pass it to a user-provided receive callback function.
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120 | *
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121 | * Given an incoming IP datagram (as a chain of pbufs) this function
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122 | * finds a corresponding RAW PCB and calls the corresponding receive
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123 | * callback function.
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124 | *
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125 | * @param p pbuf to be demultiplexed to a RAW PCB.
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126 | * @param inp network interface on which the datagram was received.
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127 | * @return - 1 if the packet has been eaten by a RAW PCB receive
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128 | * callback function. The caller MAY NOT not reference the
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129 | * packet any longer, and MAY NOT call pbuf_free().
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130 | * @return - 0 if packet is not eaten (pbuf is still referenced by the
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131 | * caller).
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132 | *
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133 | */
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134 | raw_input_state_t
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135 | raw_input(struct pbuf *p, struct netif *inp)
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136 | {
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137 | struct raw_pcb *pcb, *prev;
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138 | s16_t proto;
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139 | raw_input_state_t ret = RAW_INPUT_NONE;
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140 | u8_t broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), ip_current_netif());
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141 |
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142 | LWIP_UNUSED_ARG(inp);
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143 |
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144 | #if LWIP_IPV6
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145 | #if LWIP_IPV4
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146 | if (IP_HDR_GET_VERSION(p->payload) == 6)
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147 | #endif /* LWIP_IPV4 */
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148 | {
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149 | struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
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150 | proto = IP6H_NEXTH(ip6hdr);
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151 | }
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152 | #if LWIP_IPV4
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153 | else
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154 | #endif /* LWIP_IPV4 */
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155 | #endif /* LWIP_IPV6 */
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156 | #if LWIP_IPV4
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157 | {
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158 | proto = IPH_PROTO((struct ip_hdr *)p->payload);
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159 | }
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160 | #endif /* LWIP_IPV4 */
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161 |
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162 | prev = NULL;
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163 | pcb = raw_pcbs;
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164 | /* loop through all raw pcbs until the packet is eaten by one */
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165 | /* this allows multiple pcbs to match against the packet by design */
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166 | while (pcb != NULL) {
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167 | if ((pcb->protocol == proto) && raw_input_local_match(pcb, broadcast) &&
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168 | (((pcb->flags & RAW_FLAGS_CONNECTED) == 0) ||
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169 | ip_addr_cmp(&pcb->remote_ip, ip_current_src_addr()))) {
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170 | /* receive callback function available? */
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171 | if (pcb->recv != NULL) {
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172 | u8_t eaten;
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173 | #ifndef LWIP_NOASSERT
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174 | void *old_payload = p->payload;
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175 | #endif
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176 | ret = RAW_INPUT_DELIVERED;
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177 | /* the receive callback function did not eat the packet? */
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178 | eaten = pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr());
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179 | if (eaten != 0) {
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180 | /* receive function ate the packet */
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181 | p = NULL;
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182 | if (prev != NULL) {
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183 | /* move the pcb to the front of raw_pcbs so that is
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184 | found faster next time */
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185 | prev->next = pcb->next;
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186 | pcb->next = raw_pcbs;
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187 | raw_pcbs = pcb;
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188 | }
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189 | return RAW_INPUT_EATEN;
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190 | } else {
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191 | /* sanity-check that the receive callback did not alter the pbuf */
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192 | LWIP_ASSERT("raw pcb recv callback altered pbuf payload pointer without eating packet",
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193 | p->payload == old_payload);
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194 | }
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195 | }
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196 | /* no receive callback function was set for this raw PCB */
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197 | }
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198 | /* drop the packet */
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199 | prev = pcb;
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200 | pcb = pcb->next;
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201 | }
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202 | return ret;
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203 | }
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204 |
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205 | /**
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206 | * @ingroup raw_raw
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207 | * Bind a RAW PCB.
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208 | *
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209 | * @param pcb RAW PCB to be bound with a local address ipaddr.
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210 | * @param ipaddr local IP address to bind with. Use IP4_ADDR_ANY to
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211 | * bind to all local interfaces.
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212 | *
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213 | * @return lwIP error code.
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214 | * - ERR_OK. Successful. No error occurred.
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215 | * - ERR_USE. The specified IP address is already bound to by
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216 | * another RAW PCB.
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217 | *
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218 | * @see raw_disconnect()
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219 | */
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220 | err_t
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221 | raw_bind(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
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222 | {
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223 | LWIP_ASSERT_CORE_LOCKED();
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224 | if ((pcb == NULL) || (ipaddr == NULL)) {
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225 | return ERR_VAL;
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226 | }
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227 | ip_addr_set_ipaddr(&pcb->local_ip, ipaddr);
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228 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
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229 | /* If the given IP address should have a zone but doesn't, assign one now.
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230 | * This is legacy support: scope-aware callers should always provide properly
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231 | * zoned source addresses. */
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232 | if (IP_IS_V6(&pcb->local_ip) &&
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233 | ip6_addr_lacks_zone(ip_2_ip6(&pcb->local_ip), IP6_UNKNOWN)) {
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234 | ip6_addr_select_zone(ip_2_ip6(&pcb->local_ip), ip_2_ip6(&pcb->local_ip));
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235 | }
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236 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
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237 | return ERR_OK;
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238 | }
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239 |
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240 | /**
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241 | * @ingroup raw_raw
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242 | * Bind an RAW PCB to a specific netif.
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243 | * After calling this function, all packets received via this PCB
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244 | * are guaranteed to have come in via the specified netif, and all
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245 | * outgoing packets will go out via the specified netif.
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246 | *
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247 | * @param pcb RAW PCB to be bound with netif.
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248 | * @param netif netif to bind to. Can be NULL.
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249 | *
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250 | * @see raw_disconnect()
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251 | */
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252 | void
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253 | raw_bind_netif(struct raw_pcb *pcb, const struct netif *netif)
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254 | {
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255 | LWIP_ASSERT_CORE_LOCKED();
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256 | if (netif != NULL) {
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257 | pcb->netif_idx = netif_get_index(netif);
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258 | } else {
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259 | pcb->netif_idx = NETIF_NO_INDEX;
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260 | }
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261 | }
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262 |
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263 | /**
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264 | * @ingroup raw_raw
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265 | * Connect an RAW PCB. This function is required by upper layers
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266 | * of lwip. Using the raw api you could use raw_sendto() instead
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267 | *
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268 | * This will associate the RAW PCB with the remote address.
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269 | *
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270 | * @param pcb RAW PCB to be connected with remote address ipaddr and port.
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271 | * @param ipaddr remote IP address to connect with.
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272 | *
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273 | * @return lwIP error code
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274 | *
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275 | * @see raw_disconnect() and raw_sendto()
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276 | */
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277 | err_t
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278 | raw_connect(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
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279 | {
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280 | LWIP_ASSERT_CORE_LOCKED();
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281 | if ((pcb == NULL) || (ipaddr == NULL)) {
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282 | return ERR_VAL;
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283 | }
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284 | ip_addr_set_ipaddr(&pcb->remote_ip, ipaddr);
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285 | #if LWIP_IPV6 && LWIP_IPV6_SCOPES
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286 | /* If the given IP address should have a zone but doesn't, assign one now,
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287 | * using the bound address to make a more informed decision when possible. */
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288 | if (IP_IS_V6(&pcb->remote_ip) &&
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289 | ip6_addr_lacks_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNKNOWN)) {
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290 | ip6_addr_select_zone(ip_2_ip6(&pcb->remote_ip), ip_2_ip6(&pcb->local_ip));
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291 | }
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292 | #endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
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293 | raw_set_flags(pcb, RAW_FLAGS_CONNECTED);
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294 | return ERR_OK;
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295 | }
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296 |
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297 | /**
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298 | * @ingroup raw_raw
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299 | * Disconnect a RAW PCB.
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300 | *
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301 | * @param pcb the raw pcb to disconnect.
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302 | */
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303 | void
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304 | raw_disconnect(struct raw_pcb *pcb)
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305 | {
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306 | LWIP_ASSERT_CORE_LOCKED();
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307 | /* reset remote address association */
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308 | #if LWIP_IPV4 && LWIP_IPV6
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309 | if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
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310 | ip_addr_copy(pcb->remote_ip, *IP_ANY_TYPE);
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311 | } else {
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312 | #endif
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313 | ip_addr_set_any(IP_IS_V6_VAL(pcb->remote_ip), &pcb->remote_ip);
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314 | #if LWIP_IPV4 && LWIP_IPV6
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315 | }
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316 | #endif
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317 | pcb->netif_idx = NETIF_NO_INDEX;
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318 | /* mark PCB as unconnected */
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319 | raw_clear_flags(pcb, RAW_FLAGS_CONNECTED);
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320 | }
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321 |
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322 | /**
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323 | * @ingroup raw_raw
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324 | * Set the callback function for received packets that match the
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325 | * raw PCB's protocol and binding.
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326 | *
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327 | * The callback function MUST either
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328 | * - eat the packet by calling pbuf_free() and returning non-zero. The
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329 | * packet will not be passed to other raw PCBs or other protocol layers.
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330 | * - not free the packet, and return zero. The packet will be matched
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331 | * against further PCBs and/or forwarded to another protocol layers.
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332 | */
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333 | void
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334 | raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
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335 | {
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336 | LWIP_ASSERT_CORE_LOCKED();
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337 | /* remember recv() callback and user data */
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338 | pcb->recv = recv;
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339 | pcb->recv_arg = recv_arg;
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340 | }
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341 |
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342 | /**
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343 | * @ingroup raw_raw
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344 | * Send the raw IP packet to the given address. An IP header will be prepended
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345 | * to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that
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346 | * case, the packet must include an IP header, which will then be sent as is.
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347 | *
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348 | * @param pcb the raw pcb which to send
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349 | * @param p the IP payload to send
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350 | * @param ipaddr the destination address of the IP packet
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351 | *
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352 | */
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353 | err_t
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354 | raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr)
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355 | {
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356 | struct netif *netif;
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357 | const ip_addr_t *src_ip;
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358 |
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359 | if ((pcb == NULL) || (ipaddr == NULL) || !IP_ADDR_PCB_VERSION_MATCH(pcb, ipaddr)) {
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360 | return ERR_VAL;
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361 | }
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362 |
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363 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
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364 |
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365 | if (pcb->netif_idx != NETIF_NO_INDEX) {
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366 | netif = netif_get_by_index(pcb->netif_idx);
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367 | } else {
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368 | #if LWIP_MULTICAST_TX_OPTIONS
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369 | netif = NULL;
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370 | if (ip_addr_ismulticast(ipaddr)) {
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371 | /* For multicast-destined packets, use the user-provided interface index to
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372 | * determine the outgoing interface, if an interface index is set and a
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373 | * matching netif can be found. Otherwise, fall back to regular routing. */
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374 | netif = netif_get_by_index(pcb->mcast_ifindex);
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375 | }
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376 |
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377 | if (netif == NULL)
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378 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
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379 | {
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380 | netif = ip_route(&pcb->local_ip, ipaddr);
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381 | }
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382 | }
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383 |
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384 | if (netif == NULL) {
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385 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to "));
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386 | ip_addr_debug_print(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ipaddr);
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387 | return ERR_RTE;
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388 | }
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389 |
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390 | if (ip_addr_isany(&pcb->local_ip) || ip_addr_ismulticast(&pcb->local_ip)) {
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391 | /* use outgoing network interface IP address as source address */
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392 | src_ip = ip_netif_get_local_ip(netif, ipaddr);
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393 | #if LWIP_IPV6
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394 | if (src_ip == NULL) {
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395 | return ERR_RTE;
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396 | }
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397 | #endif /* LWIP_IPV6 */
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398 | } else {
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399 | /* use RAW PCB local IP address as source address */
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400 | src_ip = &pcb->local_ip;
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401 | }
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402 |
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403 | return raw_sendto_if_src(pcb, p, ipaddr, netif, src_ip);
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404 | }
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405 |
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406 | /**
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407 | * @ingroup raw_raw
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408 | * Send the raw IP packet to the given address, using a particular outgoing
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409 | * netif and source IP address. An IP header will be prepended to the packet,
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410 | * unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the
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411 | * packet must include an IP header, which will then be sent as is.
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412 | *
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413 | * @param pcb RAW PCB used to send the data
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414 | * @param p chain of pbufs to be sent
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415 | * @param dst_ip destination IP address
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416 | * @param netif the netif used for sending
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417 | * @param src_ip source IP address
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418 | */
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419 | err_t
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420 | raw_sendto_if_src(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip,
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421 | struct netif *netif, const ip_addr_t *src_ip)
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422 | {
|
---|
423 | err_t err;
|
---|
424 | struct pbuf *q; /* q will be sent down the stack */
|
---|
425 | u16_t header_size;
|
---|
426 | u8_t ttl;
|
---|
427 |
|
---|
428 | LWIP_ASSERT_CORE_LOCKED();
|
---|
429 |
|
---|
430 | if ((pcb == NULL) || (dst_ip == NULL) || (netif == NULL) || (src_ip == NULL) ||
|
---|
431 | !IP_ADDR_PCB_VERSION_MATCH(pcb, src_ip) || !IP_ADDR_PCB_VERSION_MATCH(pcb, dst_ip)) {
|
---|
432 | return ERR_VAL;
|
---|
433 | }
|
---|
434 |
|
---|
435 | header_size = (
|
---|
436 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
437 | IP_IS_V6(dst_ip) ? IP6_HLEN : IP_HLEN);
|
---|
438 | #elif LWIP_IPV4
|
---|
439 | IP_HLEN);
|
---|
440 | #else
|
---|
441 | IP6_HLEN);
|
---|
442 | #endif
|
---|
443 |
|
---|
444 | /* Handle the HDRINCL option as an exception: none of the code below applies
|
---|
445 | * to this case, and sending the packet needs to be done differently too. */
|
---|
446 | if (pcb->flags & RAW_FLAGS_HDRINCL) {
|
---|
447 | /* A full header *must* be present in the first pbuf of the chain, as the
|
---|
448 | * output routines may access its fields directly. */
|
---|
449 | if (p->len < header_size) {
|
---|
450 | return ERR_VAL;
|
---|
451 | }
|
---|
452 | /* @todo multicast loop support, if at all desired for this scenario.. */
|
---|
453 | NETIF_SET_HINTS(netif, &pcb->netif_hints);
|
---|
454 | err = ip_output_if_hdrincl(p, src_ip, dst_ip, netif);
|
---|
455 | NETIF_RESET_HINTS(netif);
|
---|
456 | return err;
|
---|
457 | }
|
---|
458 |
|
---|
459 | /* packet too large to add an IP header without causing an overflow? */
|
---|
460 | if ((u16_t)(p->tot_len + header_size) < p->tot_len) {
|
---|
461 | return ERR_MEM;
|
---|
462 | }
|
---|
463 | /* not enough space to add an IP header to first pbuf in given p chain? */
|
---|
464 | if (pbuf_add_header(p, header_size)) {
|
---|
465 | /* allocate header in new pbuf */
|
---|
466 | q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
|
---|
467 | /* new header pbuf could not be allocated? */
|
---|
468 | if (q == NULL) {
|
---|
469 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
|
---|
470 | return ERR_MEM;
|
---|
471 | }
|
---|
472 | if (p->tot_len != 0) {
|
---|
473 | /* chain header q in front of given pbuf p */
|
---|
474 | pbuf_chain(q, p);
|
---|
475 | }
|
---|
476 | /* { first pbuf q points to header pbuf } */
|
---|
477 | LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
|
---|
478 | } else {
|
---|
479 | /* first pbuf q equals given pbuf */
|
---|
480 | q = p;
|
---|
481 | if (pbuf_remove_header(q, header_size)) {
|
---|
482 | LWIP_ASSERT("Can't restore header we just removed!", 0);
|
---|
483 | return ERR_MEM;
|
---|
484 | }
|
---|
485 | }
|
---|
486 |
|
---|
487 | #if IP_SOF_BROADCAST
|
---|
488 | if (IP_IS_V4(dst_ip)) {
|
---|
489 | /* broadcast filter? */
|
---|
490 | if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
|
---|
491 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
|
---|
492 | /* free any temporary header pbuf allocated by pbuf_header() */
|
---|
493 | if (q != p) {
|
---|
494 | pbuf_free(q);
|
---|
495 | }
|
---|
496 | return ERR_VAL;
|
---|
497 | }
|
---|
498 | }
|
---|
499 | #endif /* IP_SOF_BROADCAST */
|
---|
500 |
|
---|
501 | /* Multicast Loop? */
|
---|
502 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
503 | if (((pcb->flags & RAW_FLAGS_MULTICAST_LOOP) != 0) && ip_addr_ismulticast(dst_ip)) {
|
---|
504 | q->flags |= PBUF_FLAG_MCASTLOOP;
|
---|
505 | }
|
---|
506 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
507 |
|
---|
508 | #if LWIP_IPV6
|
---|
509 | /* If requested, based on the IPV6_CHECKSUM socket option per RFC3542,
|
---|
510 | compute the checksum and update the checksum in the payload. */
|
---|
511 | if (IP_IS_V6(dst_ip) && pcb->chksum_reqd) {
|
---|
512 | u16_t chksum = ip6_chksum_pseudo(p, pcb->protocol, p->tot_len, ip_2_ip6(src_ip), ip_2_ip6(dst_ip));
|
---|
513 | LWIP_ASSERT("Checksum must fit into first pbuf", p->len >= (pcb->chksum_offset + 2));
|
---|
514 | SMEMCPY(((u8_t *)p->payload) + pcb->chksum_offset, &chksum, sizeof(u16_t));
|
---|
515 | }
|
---|
516 | #endif
|
---|
517 |
|
---|
518 | /* Determine TTL to use */
|
---|
519 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
520 | ttl = (ip_addr_ismulticast(dst_ip) ? raw_get_multicast_ttl(pcb) : pcb->ttl);
|
---|
521 | #else /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
522 | ttl = pcb->ttl;
|
---|
523 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
524 |
|
---|
525 | NETIF_SET_HINTS(netif, &pcb->netif_hints);
|
---|
526 | err = ip_output_if(q, src_ip, dst_ip, ttl, pcb->tos, pcb->protocol, netif);
|
---|
527 | NETIF_RESET_HINTS(netif);
|
---|
528 |
|
---|
529 | /* did we chain a header earlier? */
|
---|
530 | if (q != p) {
|
---|
531 | /* free the header */
|
---|
532 | pbuf_free(q);
|
---|
533 | }
|
---|
534 | return err;
|
---|
535 | }
|
---|
536 |
|
---|
537 | /**
|
---|
538 | * @ingroup raw_raw
|
---|
539 | * Send the raw IP packet to the address given by raw_connect()
|
---|
540 | *
|
---|
541 | * @param pcb the raw pcb which to send
|
---|
542 | * @param p the IP payload to send
|
---|
543 | *
|
---|
544 | */
|
---|
545 | err_t
|
---|
546 | raw_send(struct raw_pcb *pcb, struct pbuf *p)
|
---|
547 | {
|
---|
548 | return raw_sendto(pcb, p, &pcb->remote_ip);
|
---|
549 | }
|
---|
550 |
|
---|
551 | /**
|
---|
552 | * @ingroup raw_raw
|
---|
553 | * Remove an RAW PCB.
|
---|
554 | *
|
---|
555 | * @param pcb RAW PCB to be removed. The PCB is removed from the list of
|
---|
556 | * RAW PCB's and the data structure is freed from memory.
|
---|
557 | *
|
---|
558 | * @see raw_new()
|
---|
559 | */
|
---|
560 | void
|
---|
561 | raw_remove(struct raw_pcb *pcb)
|
---|
562 | {
|
---|
563 | struct raw_pcb *pcb2;
|
---|
564 | LWIP_ASSERT_CORE_LOCKED();
|
---|
565 | /* pcb to be removed is first in list? */
|
---|
566 | if (raw_pcbs == pcb) {
|
---|
567 | /* make list start at 2nd pcb */
|
---|
568 | raw_pcbs = raw_pcbs->next;
|
---|
569 | /* pcb not 1st in list */
|
---|
570 | } else {
|
---|
571 | for (pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
|
---|
572 | /* find pcb in raw_pcbs list */
|
---|
573 | if (pcb2->next != NULL && pcb2->next == pcb) {
|
---|
574 | /* remove pcb from list */
|
---|
575 | pcb2->next = pcb->next;
|
---|
576 | break;
|
---|
577 | }
|
---|
578 | }
|
---|
579 | }
|
---|
580 | memp_free(MEMP_RAW_PCB, pcb);
|
---|
581 | }
|
---|
582 |
|
---|
583 | /**
|
---|
584 | * @ingroup raw_raw
|
---|
585 | * Create a RAW PCB.
|
---|
586 | *
|
---|
587 | * @return The RAW PCB which was created. NULL if the PCB data structure
|
---|
588 | * could not be allocated.
|
---|
589 | *
|
---|
590 | * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
|
---|
591 | *
|
---|
592 | * @see raw_remove()
|
---|
593 | */
|
---|
594 | struct raw_pcb *
|
---|
595 | raw_new(u8_t proto)
|
---|
596 | {
|
---|
597 | struct raw_pcb *pcb;
|
---|
598 |
|
---|
599 | LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
|
---|
600 | LWIP_ASSERT_CORE_LOCKED();
|
---|
601 |
|
---|
602 | pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
|
---|
603 | /* could allocate RAW PCB? */
|
---|
604 | if (pcb != NULL) {
|
---|
605 | /* initialize PCB to all zeroes */
|
---|
606 | memset(pcb, 0, sizeof(struct raw_pcb));
|
---|
607 | pcb->protocol = proto;
|
---|
608 | pcb->ttl = RAW_TTL;
|
---|
609 | #if LWIP_MULTICAST_TX_OPTIONS
|
---|
610 | raw_set_multicast_ttl(pcb, RAW_TTL);
|
---|
611 | #endif /* LWIP_MULTICAST_TX_OPTIONS */
|
---|
612 | pcb->next = raw_pcbs;
|
---|
613 | raw_pcbs = pcb;
|
---|
614 | }
|
---|
615 | return pcb;
|
---|
616 | }
|
---|
617 |
|
---|
618 | /**
|
---|
619 | * @ingroup raw_raw
|
---|
620 | * Create a RAW PCB for specific IP type.
|
---|
621 | *
|
---|
622 | * @return The RAW PCB which was created. NULL if the PCB data structure
|
---|
623 | * could not be allocated.
|
---|
624 | *
|
---|
625 | * @param type IP address type, see @ref lwip_ip_addr_type definitions.
|
---|
626 | * If you want to listen to IPv4 and IPv6 (dual-stack) packets,
|
---|
627 | * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE.
|
---|
628 | * @param proto the protocol number (next header) of the IPv6 packet payload
|
---|
629 | * (e.g. IP6_NEXTH_ICMP6)
|
---|
630 | *
|
---|
631 | * @see raw_remove()
|
---|
632 | */
|
---|
633 | struct raw_pcb *
|
---|
634 | raw_new_ip_type(u8_t type, u8_t proto)
|
---|
635 | {
|
---|
636 | struct raw_pcb *pcb;
|
---|
637 | LWIP_ASSERT_CORE_LOCKED();
|
---|
638 | pcb = raw_new(proto);
|
---|
639 | #if LWIP_IPV4 && LWIP_IPV6
|
---|
640 | if (pcb != NULL) {
|
---|
641 | IP_SET_TYPE_VAL(pcb->local_ip, type);
|
---|
642 | IP_SET_TYPE_VAL(pcb->remote_ip, type);
|
---|
643 | }
|
---|
644 | #else /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
645 | LWIP_UNUSED_ARG(type);
|
---|
646 | #endif /* LWIP_IPV4 && LWIP_IPV6 */
|
---|
647 | return pcb;
|
---|
648 | }
|
---|
649 |
|
---|
650 | /** This function is called from netif.c when address is changed
|
---|
651 | *
|
---|
652 | * @param old_addr IP address of the netif before change
|
---|
653 | * @param new_addr IP address of the netif after change
|
---|
654 | */
|
---|
655 | void raw_netif_ip_addr_changed(const ip_addr_t *old_addr, const ip_addr_t *new_addr)
|
---|
656 | {
|
---|
657 | struct raw_pcb *rpcb;
|
---|
658 |
|
---|
659 | if (!ip_addr_isany(old_addr) && !ip_addr_isany(new_addr)) {
|
---|
660 | for (rpcb = raw_pcbs; rpcb != NULL; rpcb = rpcb->next) {
|
---|
661 | /* PCB bound to current local interface address? */
|
---|
662 | if (ip_addr_cmp(&rpcb->local_ip, old_addr)) {
|
---|
663 | /* The PCB is bound to the old ipaddr and
|
---|
664 | * is set to bound to the new one instead */
|
---|
665 | ip_addr_copy(rpcb->local_ip, *new_addr);
|
---|
666 | }
|
---|
667 | }
|
---|
668 | }
|
---|
669 | }
|
---|
670 |
|
---|
671 | #endif /* LWIP_RAW */
|
---|