forked from xuos/xiuos
145 lines
5.5 KiB
C
145 lines
5.5 KiB
C
/**
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* @file
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*
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* IPv6 fragmentation and reassembly.
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*/
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/*
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* Copyright (c) 2010 Inico Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Ivan Delamer <delamer@inicotech.com>
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*
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*
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* Please coordinate changes and requests with Ivan Delamer
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* <delamer@inicotech.com>
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*/
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#ifndef LWIP_HDR_IP6_FRAG_H
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#define LWIP_HDR_IP6_FRAG_H
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#include "lwip/opt.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip6_addr.h"
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#include "lwip/ip6.h"
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#include "lwip/netif.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if LWIP_IPV6 && LWIP_IPV6_REASS /* don't build if not configured for use in lwipopts.h */
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/** The IPv6 reassembly timer interval in milliseconds. */
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#define IP6_REASS_TMR_INTERVAL 1000
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/** IP6_FRAG_COPYHEADER==1: for platforms where sizeof(void*) > 4, "struct
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* ip6_reass_helper" is too large to be stored in the IPv6 fragment header, and
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* will bleed into the header before it, which may be the IPv6 header or an
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* extension header. This means that for each first fragment packet, we need to
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* 1) make a copy of some IPv6 header fields (src+dest) that we need later on,
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* just in case we do overwrite part of the IPv6 header, and 2) make a copy of
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* the header data that we overwrote, so that we can restore it before either
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* completing reassembly or sending an ICMPv6 reply. The last part is true even
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* if this setting is disabled, but if it is enabled, we need to save a bit
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* more data (up to the size of a pointer) because we overwrite more. */
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#ifndef IPV6_FRAG_COPYHEADER
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#define IPV6_FRAG_COPYHEADER 0
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#endif
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/* With IPV6_FRAG_COPYHEADER==1, a helper structure may (or, depending on the
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* presence of extensions, may not) overwrite part of the IP header. Therefore,
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* we copy the fields that we need from the IP header for as long as the helper
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* structure may still be in place. This is easier than temporarily restoring
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* those fields in the IP header each time we need to perform checks on them. */
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#if IPV6_FRAG_COPYHEADER
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#define IPV6_FRAG_SRC(ipr) ((ipr)->src)
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#define IPV6_FRAG_DEST(ipr) ((ipr)->dest)
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#else /* IPV6_FRAG_COPYHEADER */
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#define IPV6_FRAG_SRC(ipr) ((ipr)->iphdr->src)
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#define IPV6_FRAG_DEST(ipr) ((ipr)->iphdr->dest)
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#endif /* IPV6_FRAG_COPYHEADER */
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/** IPv6 reassembly helper struct.
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* This is exported because memp needs to know the size.
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*/
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struct ip6_reassdata {
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struct ip6_reassdata *next;
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struct pbuf *p;
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struct ip6_hdr *iphdr; /* pointer to the first (original) IPv6 header */
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#if IPV6_FRAG_COPYHEADER
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ip6_addr_p_t src; /* copy of the source address in the IP header */
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ip6_addr_p_t dest; /* copy of the destination address in the IP header */
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/* This buffer (for the part of the original header that we overwrite) will
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* be slightly oversized, but we cannot compute the exact size from here. */
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u8_t orig_hdr[sizeof(struct ip6_frag_hdr) + sizeof(void*)];
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#else /* IPV6_FRAG_COPYHEADER */
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/* In this case we still need the buffer, for sending ICMPv6 replies. */
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u8_t orig_hdr[sizeof(struct ip6_frag_hdr)];
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#endif /* IPV6_FRAG_COPYHEADER */
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u32_t identification;
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u16_t datagram_len;
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u8_t nexth;
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u8_t timer;
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#if LWIP_IPV6_SCOPES
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u8_t src_zone; /* zone of original packet's source address */
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u8_t dest_zone; /* zone of original packet's destination address */
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#endif /* LWIP_IPV6_SCOPES */
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};
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#define ip6_reass_init() /* Compatibility define */
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void ip6_reass_tmr(void);
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struct pbuf *ip6_reass(struct pbuf *p);
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#endif /* LWIP_IPV6 && LWIP_IPV6_REASS */
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#if LWIP_IPV6 && LWIP_IPV6_FRAG /* don't build if not configured for use in lwipopts.h */
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#ifndef LWIP_PBUF_CUSTOM_REF_DEFINED
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#define LWIP_PBUF_CUSTOM_REF_DEFINED
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/** A custom pbuf that holds a reference to another pbuf, which is freed
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* when this custom pbuf is freed. This is used to create a custom PBUF_REF
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* that points into the original pbuf. */
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struct pbuf_custom_ref {
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/** 'base class' */
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struct pbuf_custom pc;
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/** pointer to the original pbuf that is referenced */
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struct pbuf *original;
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};
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#endif /* LWIP_PBUF_CUSTOM_REF_DEFINED */
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err_t ip6_frag(struct pbuf *p, struct netif *netif, const ip6_addr_t *dest);
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#endif /* LWIP_IPV6 && LWIP_IPV6_FRAG */
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_IP6_FRAG_H */
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