1 | /**
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2 | * @file
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3 | *
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4 | * IPv6 fragmentation and reassembly.
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5 | */
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6 |
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7 | /*
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8 | * Copyright (c) 2010 Inico Technologies Ltd.
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9 | * All rights reserved.
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10 | *
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11 | * Redistribution and use in source and binary forms, with or without modification,
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12 | * are permitted provided that the following conditions are met:
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13 | *
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14 | * 1. Redistributions of source code must retain the above copyright notice,
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15 | * this list of conditions and the following disclaimer.
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16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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17 | * this list of conditions and the following disclaimer in the documentation
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18 | * and/or other materials provided with the distribution.
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19 | * 3. The name of the author may not be used to endorse or promote products
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20 | * derived from this software without specific prior written permission.
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21 | *
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22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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31 | * OF SUCH DAMAGE.
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32 | *
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33 | * This file is part of the lwIP TCP/IP stack.
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34 | *
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35 | * Author: Ivan Delamer <delamer@inicotech.com>
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36 | *
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37 | *
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38 | * Please coordinate changes and requests with Ivan Delamer
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39 | * <delamer@inicotech.com>
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40 | */
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41 | #ifndef LWIP_HDR_IP6_FRAG_H
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42 | #define LWIP_HDR_IP6_FRAG_H
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43 |
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44 | #include "lwip/opt.h"
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45 | #include "lwip/pbuf.h"
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46 | #include "lwip/ip6_addr.h"
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47 | #include "lwip/ip6.h"
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48 | #include "lwip/netif.h"
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49 |
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50 | #ifdef __cplusplus
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51 | extern "C" {
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52 | #endif
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53 |
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54 |
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55 | #if LWIP_IPV6 && LWIP_IPV6_REASS /* don't build if not configured for use in lwipopts.h */
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56 |
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57 | /** The IPv6 reassembly timer interval in milliseconds. */
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58 | #define IP6_REASS_TMR_INTERVAL 1000
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59 |
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60 | /** IP6_FRAG_COPYHEADER==1: for platforms where sizeof(void*) > 4, "struct
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61 | * ip6_reass_helper" is too large to be stored in the IPv6 fragment header, and
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62 | * will bleed into the header before it, which may be the IPv6 header or an
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63 | * extension header. This means that for each first fragment packet, we need to
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64 | * 1) make a copy of some IPv6 header fields (src+dest) that we need later on,
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65 | * just in case we do overwrite part of the IPv6 header, and 2) make a copy of
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66 | * the header data that we overwrote, so that we can restore it before either
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67 | * completing reassembly or sending an ICMPv6 reply. The last part is true even
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68 | * if this setting is disabled, but if it is enabled, we need to save a bit
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69 | * more data (up to the size of a pointer) because we overwrite more. */
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70 | #ifndef IPV6_FRAG_COPYHEADER
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71 | #define IPV6_FRAG_COPYHEADER 0
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72 | #endif
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73 |
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74 | /* With IPV6_FRAG_COPYHEADER==1, a helper structure may (or, depending on the
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75 | * presence of extensions, may not) overwrite part of the IP header. Therefore,
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76 | * we copy the fields that we need from the IP header for as long as the helper
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77 | * structure may still be in place. This is easier than temporarily restoring
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78 | * those fields in the IP header each time we need to perform checks on them. */
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79 | #if IPV6_FRAG_COPYHEADER
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80 | #define IPV6_FRAG_SRC(ipr) ((ipr)->src)
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81 | #define IPV6_FRAG_DEST(ipr) ((ipr)->dest)
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82 | #else /* IPV6_FRAG_COPYHEADER */
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83 | #define IPV6_FRAG_SRC(ipr) ((ipr)->iphdr->src)
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84 | #define IPV6_FRAG_DEST(ipr) ((ipr)->iphdr->dest)
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85 | #endif /* IPV6_FRAG_COPYHEADER */
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86 |
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87 | /** IPv6 reassembly helper struct.
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88 | * This is exported because memp needs to know the size.
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89 | */
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90 | struct ip6_reassdata {
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91 | struct ip6_reassdata *next;
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92 | struct pbuf *p;
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93 | struct ip6_hdr *iphdr; /* pointer to the first (original) IPv6 header */
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94 | #if IPV6_FRAG_COPYHEADER
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95 | ip6_addr_p_t src; /* copy of the source address in the IP header */
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96 | ip6_addr_p_t dest; /* copy of the destination address in the IP header */
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97 | /* This buffer (for the part of the original header that we overwrite) will
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98 | * be slightly oversized, but we cannot compute the exact size from here. */
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99 | u8_t orig_hdr[sizeof(struct ip6_frag_hdr) + sizeof(void*)];
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100 | #else /* IPV6_FRAG_COPYHEADER */
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101 | /* In this case we still need the buffer, for sending ICMPv6 replies. */
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102 | u8_t orig_hdr[sizeof(struct ip6_frag_hdr)];
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103 | #endif /* IPV6_FRAG_COPYHEADER */
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104 | u32_t identification;
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105 | u16_t datagram_len;
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106 | u8_t nexth;
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107 | u8_t timer;
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108 | #if LWIP_IPV6_SCOPES
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109 | u8_t src_zone; /* zone of original packet's source address */
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110 | u8_t dest_zone; /* zone of original packet's destination address */
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111 | #endif /* LWIP_IPV6_SCOPES */
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112 | };
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113 |
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114 | #define ip6_reass_init() /* Compatibility define */
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115 | void ip6_reass_tmr(void);
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116 | struct pbuf *ip6_reass(struct pbuf *p);
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117 |
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118 | #endif /* LWIP_IPV6 && LWIP_IPV6_REASS */
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119 |
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120 | #if LWIP_IPV6 && LWIP_IPV6_FRAG /* don't build if not configured for use in lwipopts.h */
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121 |
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122 | #ifndef LWIP_PBUF_CUSTOM_REF_DEFINED
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123 | #define LWIP_PBUF_CUSTOM_REF_DEFINED
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124 | /** A custom pbuf that holds a reference to another pbuf, which is freed
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125 | * when this custom pbuf is freed. This is used to create a custom PBUF_REF
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126 | * that points into the original pbuf. */
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127 | struct pbuf_custom_ref {
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128 | /** 'base class' */
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129 | struct pbuf_custom pc;
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130 | /** pointer to the original pbuf that is referenced */
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131 | struct pbuf *original;
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132 | };
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133 | #endif /* LWIP_PBUF_CUSTOM_REF_DEFINED */
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134 |
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135 | err_t ip6_frag(struct pbuf *p, struct netif *netif, const ip6_addr_t *dest);
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136 |
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137 | #endif /* LWIP_IPV6 && LWIP_IPV6_FRAG */
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138 |
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139 |
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140 | #ifdef __cplusplus
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141 | }
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142 | #endif
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143 |
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144 | #endif /* LWIP_HDR_IP6_FRAG_H */
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