689 lines
24 KiB
C
689 lines
24 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/**
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* \file
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* Neighbor discovery (RFC 4861)
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* \author Julien Abeille <jabeille@cisco.com>
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* \author Mathilde Durvy <mdurvy@cisco.com>
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*/
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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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
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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#ifndef __UIP_ND6_H__
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#define __UIP_ND6_H__
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#include "net/uip.h"
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#include "sys/stimer.h"
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/**
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* \name General
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* @{
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*/
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/** \brief HOP LIMIT to be used when sending ND messages (255) */
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#define UIP_ND6_HOP_LIMIT 255
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/** \brief INFINITE lifetime */
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#define UIP_ND6_INFINITE_LIFETIME 0xFFFFFFFF
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/** @} */
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/** \name Configuration options */
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/** @{ */
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#ifndef UIP_CONF_ND6_MAX_NEIGHBORS
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/** \brief max number of entries in the neighbor cache */
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#define UIP_CONF_ND6_MAX_NEIGHBORS 4
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#endif /*UIP_CONF_ND6_MAX_NEIGHBORS*/
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#ifndef UIP_CONF_ND6_MAX_DEFROUTERS
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/** \brief max number of entries in the default router cache */
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#define UIP_CONF_ND6_MAX_DEFROUTERS 2
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#endif /*UIP_CONF_ND6_MAX_DEFROUTERS*/
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#ifndef UIP_CONF_ND6_MAX_PREFIXES
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/** \brief max number of entries in the prefix list */
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#define UIP_CONF_ND6_MAX_PREFIXES 2
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#endif /*UIP_CONF_ND6_MAX_PREFIXES*/
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/** @} */
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/** \name RFC 4861 Host constant */
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/** @{ */
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#define UIP_ND6_MAX_RTR_SOLICITATION_DELAY 1
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#define UIP_ND6_RTR_SOLICITATION_INTERVAL 4
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#define UIP_ND6_MAX_RTR_SOLICITATIONS 3
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/** @} */
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/** \name RFC 4861 Node constant */
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#define UIP_ND6_MAX_MULTICAST_SOLICIT 3
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#define UIP_ND6_MAX_UNICAST_SOLICIT 3
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#define UIP_ND6_REACHABLE_TIME 30000
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#define UIP_ND6_RETRANS_TIMER 1000
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#define UIP_ND6_DELAY_FIRST_PROBE_TIME 5
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#define UIP_ND6_MIN_RANDOM_FACTOR 0.5
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#define UIP_ND6_MAX_RANDOM_FACTOR 1.5
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/** @} */
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/** \name ND6 option types */
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/** @{ */
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#define UIP_ND6_OPT_SLLAO 1
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#define UIP_ND6_OPT_TLLAO 2
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#define UIP_ND6_OPT_PREFIX_INFO 3
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#define UIP_ND6_OPT_REDIRECTED_HDR 4
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#define UIP_ND6_OPT_MTU 5
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/** @} */
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/** \name ND6 message length (excluding options) */
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/** @{ */
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#define UIP_ND6_NA_LEN 20
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#define UIP_ND6_NS_LEN 20
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#define UIP_ND6_RA_LEN 12
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#define UIP_ND6_RS_LEN 4
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/** @} */
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/** \name ND6 option length in bytes */
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/** @{ */
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#define UIP_ND6_OPT_HDR_LEN 2
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#define UIP_ND6_OPT_PREFIX_INFO_LEN 32
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#define UIP_ND6_OPT_MTU_LEN 8
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/* Length of TLLAO and SLLAO options, it is L2 dependant */
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#if UIP_CONF_LL_802154
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/* If the interface is 802.15.4. For now we use only long addresses */
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#define UIP_ND6_OPT_SHORT_LLAO_LEN 8
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#define UIP_ND6_OPT_LONG_LLAO_LEN 16
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/** \brief length of a ND6 LLAO option for 802.15.4 */
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#define UIP_ND6_OPT_LLAO_LEN UIP_ND6_OPT_LONG_LLAO_LEN
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#else /*UIP_CONF_LL_802154*/
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#if UIP_CONF_LL_80211
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/* If the interface is 802.11 */
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/** \brief length of a ND6 LLAO option for 802.11 */
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#define UIP_ND6_OPT_LLAO_LEN 8
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#else /*UIP_CONF_LL_80211*/
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/** \brief length of a ND6 LLAO option for default L2 type (e.g. Ethernet) */
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#define UIP_ND6_OPT_LLAO_LEN 8
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#endif /*UIP_CONF_LL_80211*/
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#endif /*UIP_CONF_LL_802154*/
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/** @} */
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/** \name Neighbor Advertisement flags masks */
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/** @{ */
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#define UIP_ND6_NA_FLAG_ROUTER 0x80
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#define UIP_ND6_NA_FLAG_SOLICITED 0x40
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#define UIP_ND6_NA_FLAG_OVERRIDE 0x20
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/** @} */
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/**
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* \brief Possible states for the neighbor cache entries
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*
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* NO_STATE is for implementation purposes: a router entry contains a pointer
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* to a neighbor entry, which holds its ip address. If we do not know the LL
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* address of the router, we do not have to create a neighbor entry as per
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* RFC 4861. However, we still need to have the IP of the router stored in a
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* neighbor entry, hence we create an entry in the NO_STATE state
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*/
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typedef enum {
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INCOMPLETE = 0,
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REACHABLE = 1,
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STALE = 2,
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DELAY = 3,
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PROBE = 4,
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NO_STATE = 5
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} uip_neighbor_state;
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/**
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* \name ND structures
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* @{
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*/
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/** \brief An entry in the neighbor cache */
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struct uip_nd6_neighbor{
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uip_ipaddr_t ipaddr;
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uip_lladdr_t lladdr;
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u8_t isrouter;
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uip_neighbor_state state;
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struct stimer reachable;
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struct stimer last_send; /**< last time a ND message was sent */
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u8_t count_send; /**< how many ND message were already sent */
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u8_t used; /**< brief is this neighbor currently used */
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#if UIP_CONF_IPV6_QUEUE_PKT
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u8_t queue_buf[UIP_BUFSIZE - UIP_LLH_LEN];
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/**< buffer to hold one packet during address resolution */
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u8_t queue_buf_len;
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/**< length of the pkt in buffer, used as "boolean" as well*/
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#endif /*UIP_CONF_QUEUE_PKT*/
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};
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/** \brief An entry in the default router list */
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struct uip_nd6_defrouter {
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struct uip_nd6_neighbor *nb;
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struct stimer lifetime;
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/**< the lifetime contained in RA corresponds to the interval field
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* of the timer
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*/
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u8_t used; /**< Is this default router entry currently used */
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};
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/** \brief A prefix list entry */
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struct uip_nd6_prefix {
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uip_ipaddr_t ipaddr;
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u8_t length;
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/**< we do not use preferred lifetime, which is always smaller than
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* valid lifetime (for addr, preferred->deprecated)
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*/
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struct stimer vlifetime;
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u8_t is_infinite; /**< Is the prefix lifetime INFINITE */
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u8_t used; /**< Is this prefix entry currently used */
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};
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/** @} */
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extern struct etimer uip_nd6_timer_periodic;
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/**
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* \note
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* We do not use a destination cache, do next-hop determination each time
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* a packet needs to be sent. (info such as rtt, path mtu could be stored
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* in uip_conn)
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*
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*/
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/**
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* \name ND message structures
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* @{
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*/
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/**
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* \brief A neighbor solicitation constant part
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*
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* Possible option is: SLLAO
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*/
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struct uip_nd6_ns {
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u32_t reserved;
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uip_ipaddr_t tgtipaddr;
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};
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/**
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* \brief A neighbor advertisement constant part.
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*
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* Possible option is: TLLAO
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*/
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struct uip_nd6_na {
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u8_t flagsreserved;
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u8_t reserved[3];
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uip_ipaddr_t tgtipaddr;
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};
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/**
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* \brief A router solicitation constant part
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*
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* Possible option is: SLLAO
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*/
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struct uip_nd6_rs {
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u32_t reserved;
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};
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/**
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* \brief A router advertisement constant part
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*
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* Possible options are: SLLAO, MTU, Prefix Information
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*/
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struct uip_nd6_ra {
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u8_t cur_ttl;
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u8_t flags_reserved;
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u16_t router_lifetime;
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u32_t reachable_time;
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u32_t retrans_timer;
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};
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/**
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* \brief A redirect message constant part
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*
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* Possible options are: TLLAO, redirected header
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*/
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struct uip_nd6_redirect {
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u32_t reserved;
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uip_ipaddr_t tgtipaddress;
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uip_ipaddr_t destipaddress;
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};
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/** @} */
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/**
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* \name ND Option structures
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* @{
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*/
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/** \brief ND option header */
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struct uip_nd6_opt_hdr {
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u8_t type;
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u8_t len;
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};
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/** \brief ND option prefix information */
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struct uip_nd6_opt_prefix_info {
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u8_t type;
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u8_t len;
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u8_t preflen;
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u8_t flagsreserved1;
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u32_t validlt;
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u32_t preferredlt;
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u32_t reserved2;
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uip_ipaddr_t prefix;
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};
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/** \brief ND option MTU */
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struct uip_nd6_opt_mtu {
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u8_t type;
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u8_t len;
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u16_t reserved;
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u32_t mtu;
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};
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/** \brief ND option: both TLLAO and SLLAO */
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struct uip_nd6_opt_llao {
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u8_t type;
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u8_t len;
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uip_lladdr_t addr;
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};
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/** \struct Redirected header option */
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struct uip_nd6_opt_redirected_hdr {
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u8_t type;
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u8_t len;
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u8_t reserved[6];
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};
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/** @} */
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/**
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* \name ND Neighbor Cache, Router List and Prefix List handling functions
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* @{
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*/
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/**
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* \brief Initialize Neighbor Discovery structures
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*/
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void uip_nd6_init(void);
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/**
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* \brief Periodic processing of Neighbor Discovery Structures
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*/
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void uip_nd6_periodic(void);
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/**
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* \brief Look for a neighbor cache entry corresponding to a specific IP
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* address
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* \param ipaddr the specific IP address
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* \return the corresponding neighbor cache entry
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*/
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struct uip_nd6_neighbor *uip_nd6_nbrcache_lookup(uip_ipaddr_t *ipaddr);
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/**
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* \brief Add a neighbor cache entry
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* \param ipaddr the IP address of the entry
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* \param lladdr the layer 2 address of the entry
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* \param isrouter true is the entry is a router
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* \param state the state of the entry
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* \return the new neighbor or updated cache entry
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*/
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struct uip_nd6_neighbor * uip_nd6_nbrcache_add(uip_ipaddr_t *ipaddr,
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uip_lladdr_t *lladdr,
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u8_t isrouter,
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uip_neighbor_state state);
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/**
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* \brief Returns a default router
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*/
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struct uip_nd6_defrouter * uip_nd6_choose_defrouter(void);
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/**
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* \brief Find a default router corresponding to a given neighbor cache entry
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* \param neighbor the neighbor cache entry
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* \return the corresponding router if any
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*/
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struct uip_nd6_defrouter *
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uip_nd6_defrouter_lookup(struct uip_nd6_neighbor *neighbor);
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/**
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* \brief Remove a default router
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* \param router to be removed
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*/
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void uip_nd6_defrouter_rm(struct uip_nd6_defrouter *router);
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/**
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* \brief Add a default router
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* \param neighbor the corresponding neighbor cache entry
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* \param interval the lifetime of the router
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* \return the new or updated defrouter entry
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*/
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struct uip_nd6_defrouter *
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uip_nd6_defrouter_add(struct uip_nd6_neighbor *neighbor, unsigned long interval);
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/**
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* \brief Check if an IP address in on-link by looking at prefix list
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* \param ipaddr an IP address
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* \return true if on-link
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*/
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u8_t uip_nd6_is_addr_onlink(uip_ipaddr_t *ipaddr);
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/**
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* \brief Find a given prefix
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* \param ipaddr an IP address
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* \return the corresponding prefix if any
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*/
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struct uip_nd6_prefix *
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uip_nd6_prefix_lookup(uip_ipaddr_t *ipaddr);
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/**
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* \brief Add a prefix
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* \param ipaddr the IP address of the prefix
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* \param length the length of the prefix
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* \param interval the lifetime of the prefix
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* \return the new or updated prefix entry
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*/
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struct uip_nd6_prefix *
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uip_nd6_prefix_add(uip_ipaddr_t *ipaddr, u8_t length, unsigned long interval);
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/**
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* \brief Remove a prefix from th eprefix list
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* \param prefix pointer to the prefix to be removed
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*/
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void
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uip_nd6_prefix_rm(struct uip_nd6_prefix *prefix);
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/** @} */
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/**
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* \name ND Messages Processing and Generation
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* @{
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*/
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/**
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* \brief Process a neighbor solicitation
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*
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* The NS can be received in 3 cases (procedures):
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* - sender is performing DAD (ip src = unspecified, no SLLAO option)
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* - sender is performing NUD (ip dst = unicast)
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* - sender is performing address resolution (ip dest = solicited node mcast
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* address)
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*
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* We do:
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* - if the tgt belongs to me, reply, otherwise ignore
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* - if i was performing DAD for the same address, two cases:
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* -- I already sent a NS, hence I win
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* -- I did not send a NS yet, hence I lose
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*
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* If we need to send a NA in response (i.e. the NS was done for NUD, or
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* address resolution, or DAD and there is a conflict), we do it in this
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* function: set src, dst, tgt address in the three cases, then for all cases
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* set the rest, including SLLAO
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*
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*/
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void
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uip_nd6_io_ns_input(void);
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/**
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* \brief Send a neighbor solicitation, send a Neighbor Advertisement
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* \param src pointer to the src of the NS if known
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* \param dest pointer to ip address to send the NS, for DAD or ADDR Resol,
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* MUST be NULL, for NUD, must be correct unicast dest
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* \param tgt pointer to ip address to fill the target address field, must
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* not be NULL
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*
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* - RFC 4861, 7.2.2 :
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* "If the source address of the packet prompting the solicitation is the
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* same as one of the addresses assigned to the outgoing interface, that
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* address SHOULD be placed in the IP Source Address of the outgoing
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* solicitation. Otherwise, any one of the addresses assigned to the
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* interface should be used."
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* This is why we have a src ip address as argument. If NULL, we will do
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* src address selection, otherwise we use the argument.
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*
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* - we check if it is a NS for Address resolution or NUD, if yes we include
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* a SLLAO option, otherwise no.
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*/
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void
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uip_nd6_io_ns_output(uip_ipaddr_t *src, uip_ipaddr_t *dest, uip_ipaddr_t *tgt);
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/**
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* \brief Process a Neighbor Advertisement
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*
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* we might have to send a pkt that had been buffered while address
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* resolution was performed (if we support buffering, see UIP_CONF_QUEUE_PKT)
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*
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* As per RFC 4861, on link layer that have addresses, TLLAO options MUST be
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* included when responding to multicast solicitations, SHOULD be included in
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* response to unicast (here we assume it is for now)
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*
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* NA can be received after sending NS for DAD, Address resolution or NUD. Can
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* be unsolicited as well.
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* It can trigger update of the state of the neighbor in the neighbor cache,
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* router in the router list.
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* If the NS was for DAD, it means DAD failed
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*
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*/
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void
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uip_nd6_io_na_input(void);
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/**
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* \brief Send a Router Solicitation
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*
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* src is chosen through the uip_netif_select_src function. If src is
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* unspecified (i.e. we do not have a preferred address yet), then we do not
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* put a SLLAO option (MUST NOT in RFC 4861). Otherwise we do.
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*
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* RS message format,
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* possible option is SLLAO, MUST NOT be included if source = unspecified
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* SHOULD be included otherwise
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*/
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void uip_nd6_io_rs_output(void);
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/**
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*
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* \brief process a Router Advertisement
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*
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* - Possible actions when receiving a RA: add router to router list,
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* recalculate reachable time, update link hop limit, update retrans timer.
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* - If MTU option: update MTU.
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* - If SLLAO option: update entry in neighbor cache
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* - If prefix option: start autoconf, add prefix to prefix list
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*/
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void
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uip_nd6_io_ra_input(void);
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/** @} */
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void
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uip_appserver_addr_get(uip_ipaddr_t *ipaddr);
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/*--------------------------------------*/
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/******* ANNEX - message formats ********/
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/*--------------------------------------*/
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/*
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* RS format. possible option is SLLAO
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Options ...
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* +-+-+-+-+-+-+-+-+-+-+-+-
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*
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*
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* RA format. possible options: prefix information, MTU, SLLAO
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Cur Hop Limit |M|O| Reserved | Router Lifetime |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reachable Time |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Retrans Timer |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Options ...
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* +-+-+-+-+-+-+-+-+-+-+-+-
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*
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*
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* NS format: options should be SLLAO
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | |
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* + Target Address +
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* | |
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* + +
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Options ...
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* +-+-+-+-+-+-+-+-+-+-+-+-
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*
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*
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* NA message format. possible options is TLLAO
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|S|O| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | |
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* + Target Address +
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* | |
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* + +
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Options ...
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* +-+-+-+-+-+-+-+-+-+-+-+-
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*
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*
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* Redirect message format. Possible options are TLLAO and Redirected header
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
|
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* + +
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* | |
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* + Target Address +
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* | |
|
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* + +
|
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | |
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* + Destination Address +
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* | |
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* + +
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Options ...
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* +-+-+-+-+-+-+-+-+-+-+-+-
|
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*
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*
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|
* SLLAO/TLLAO option:
|
|
* 0 1 2 3
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|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|
* | Type | Length | Link-Layer Address ...
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|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
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*
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*
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|
* Prefix information option
|
|
* 0 1 2 3
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|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Length | Prefix Length |L|A| Reserved1 |
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|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Valid Lifetime |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Preferred Lifetime |
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|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|
* | Reserved2 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* + +
|
|
* | |
|
|
* + Prefix +
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|
* | |
|
|
* + +
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
*
|
|
* MTU option
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Type | Length | Reserved |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | MTU |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
*
|
|
* Redirected header option
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Type | Length | Reserved |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Reserved |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | |
|
|
* ~ IP header + data ~
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
*/
|
|
#endif /* __UIP_ND6_H__ */
|
|
|
|
/** @} */
|