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 */ 101