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1 office 1 /**
2 * @file
3 * IP fragmentation/reassembly
4 */
5  
6 /*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Jani Monoses <jani@iv.ro>
35 *
36 */
37  
38 #ifndef LWIP_HDR_IP4_FRAG_H
39 #define LWIP_HDR_IP4_FRAG_H
40  
41 #include "lwip/opt.h"
42 #include "lwip/err.h"
43 #include "lwip/pbuf.h"
44 #include "lwip/netif.h"
45 #include "lwip/ip_addr.h"
46 #include "lwip/ip.h"
47  
48 #if LWIP_IPV4
49  
50 #ifdef __cplusplus
51 extern "C" {
52 #endif
53  
54 #if IP_REASSEMBLY
55 /* The IP reassembly timer interval in milliseconds. */
56 #define IP_TMR_INTERVAL 1000
57  
58 /** IP reassembly helper struct.
59 * This is exported because memp needs to know the size.
60 */
61 struct ip_reassdata {
62 struct ip_reassdata *next;
63 struct pbuf *p;
64 struct ip_hdr iphdr;
65 u16_t datagram_len;
66 u8_t flags;
67 u8_t timer;
68 };
69  
70 void ip_reass_init(void);
71 void ip_reass_tmr(void);
72 struct pbuf * ip4_reass(struct pbuf *p);
73 #endif /* IP_REASSEMBLY */
74  
75 #if IP_FRAG
76 #if !LWIP_NETIF_TX_SINGLE_PBUF
77 #ifndef LWIP_PBUF_CUSTOM_REF_DEFINED
78 #define LWIP_PBUF_CUSTOM_REF_DEFINED
79 /** A custom pbuf that holds a reference to another pbuf, which is freed
80 * when this custom pbuf is freed. This is used to create a custom PBUF_REF
81 * that points into the original pbuf. */
82 struct pbuf_custom_ref {
83 /** 'base class' */
84 struct pbuf_custom pc;
85 /** pointer to the original pbuf that is referenced */
86 struct pbuf *original;
87 };
88 #endif /* LWIP_PBUF_CUSTOM_REF_DEFINED */
89 #endif /* !LWIP_NETIF_TX_SINGLE_PBUF */
90  
91 err_t ip4_frag(struct pbuf *p, struct netif *netif, const ip4_addr_t *dest);
92 #endif /* IP_FRAG */
93  
94 #ifdef __cplusplus
95 }
96 #endif
97  
98 #endif /* LWIP_IPV4 */
99  
100 #endif /* LWIP_HDR_IP4_FRAG_H */