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