[457] | 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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