minix/lib/liblwip/dist/src/include/lwip/ip4_frag.h

   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 */