[457] | 1 | /**
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| 2 | * @file
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| 3 | * IP fragmentation/reassembly
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 8 | * All rights reserved.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without modification,
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| 11 | * are permitted provided that the following conditions are met:
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| 12 | *
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| 13 | * 1. Redistributions of source code must retain the above copyright notice,
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| 14 | * this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 16 | * this list of conditions and the following disclaimer in the documentation
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| 17 | * and/or other materials provided with the distribution.
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| 18 | * 3. The name of the author may not be used to endorse or promote products
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| 19 | * derived from this software without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 30 | * OF SUCH DAMAGE.
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| 31 | *
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| 32 | * This file is part of the lwIP TCP/IP stack.
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| 33 | *
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| 34 | * Author: Jani Monoses <jani@iv.ro>
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| 35 | *
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| 36 | */
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| 37 |
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| 38 | #ifndef LWIP_HDR_IP4_FRAG_H
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| 39 | #define LWIP_HDR_IP4_FRAG_H
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| 40 |
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| 41 | #include "lwip/opt.h"
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| 42 | #include "lwip/err.h"
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| 43 | #include "lwip/pbuf.h"
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| 44 | #include "lwip/netif.h"
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| 45 | #include "lwip/ip_addr.h"
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| 46 | #include "lwip/ip.h"
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| 47 |
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| 48 | #if LWIP_IPV4
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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 | #if IP_REASSEMBLY
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| 55 | /* The IP reassembly timer interval in milliseconds. */
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| 56 | #define IP_TMR_INTERVAL 1000
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| 57 |
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| 58 | /** IP reassembly helper struct.
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| 59 | * This is exported because memp needs to know the size.
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| 60 | */
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| 61 | struct ip_reassdata {
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| 62 | struct ip_reassdata *next;
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| 63 | struct pbuf *p;
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| 64 | struct ip_hdr iphdr;
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| 65 | u16_t datagram_len;
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| 66 | u8_t flags;
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| 67 | u8_t timer;
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| 68 | };
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| 69 |
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| 70 | void ip_reass_init(void);
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| 71 | void ip_reass_tmr(void);
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| 72 | struct pbuf * ip4_reass(struct pbuf *p);
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| 73 | #endif /* IP_REASSEMBLY */
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| 74 |
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| 75 | #if IP_FRAG
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| 76 | #if !LWIP_NETIF_TX_SINGLE_PBUF
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| 77 | #ifndef LWIP_PBUF_CUSTOM_REF_DEFINED
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| 78 | #define LWIP_PBUF_CUSTOM_REF_DEFINED
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| 79 | /** A custom pbuf that holds a reference to another pbuf, which is freed
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| 80 | * when this custom pbuf is freed. This is used to create a custom PBUF_REF
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| 81 | * that points into the original pbuf. */
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| 82 | struct pbuf_custom_ref {
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| 83 | /** 'base class' */
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| 84 | struct pbuf_custom pc;
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| 85 | /** pointer to the original pbuf that is referenced */
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| 86 | struct pbuf *original;
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| 87 | };
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| 88 | #endif /* LWIP_PBUF_CUSTOM_REF_DEFINED */
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| 89 | #endif /* !LWIP_NETIF_TX_SINGLE_PBUF */
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| 90 |
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| 91 | err_t ip4_frag(struct pbuf *p, struct netif *netif, const ip4_addr_t *dest);
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| 92 | #endif /* IP_FRAG */
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| 93 |
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| 94 | #ifdef __cplusplus
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| 95 | }
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| 96 | #endif
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| 97 |
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| 98 | #endif /* LWIP_IPV4 */
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| 99 |
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| 100 | #endif /* LWIP_HDR_IP4_FRAG_H */
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