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