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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