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ip4_frag.h
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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 */
IP API.
lwIP Options Configuration
netif API (to be used from TCPIP thread)
Main packet buffer struct.
lwIP Error codes
Generic data structure used for all lwIP network interfaces.
pbuf API
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:190
IP address API (common IPv4 and IPv6)
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