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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.h
IP API.
opt.h
lwIP Options Configuration
netif.h
netif API (to be used from TCPIP thread)
pbuf
Main packet buffer struct.
Definition: ppp_service_if.h:136
err.h
lwIP Error codes
netif
Generic data structure used for all lwIP network interfaces.
Definition: ppp_service_if.h:157
pbuf.h
pbuf API
ip_hdr
Definition: prot/ip4.h:73
nsapi_addr
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:237
ip_addr.h
IP address API (common IPv4 and IPv6)
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