nes-proj/os/net/ipv6/uip-ds6-nbr.h
2018-10-24 07:01:57 -07:00

263 lines
9.1 KiB
C

/*
* Copyright (c) 2013, Swedish Institute of Computer Science.
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
*
*
*/
/**
* \addtogroup uip
* @{
*/
/**
* \file
* IPv6 Neighbor cache (link-layer/IPv6 address mapping)
* \author Mathilde Durvy <mdurvy@cisco.com>
* \author Julien Abeille <jabeille@cisco.com>
* \author Simon Duquennoy <simonduq@sics.se>
*
*/
#ifndef UIP_DS6_NEIGHBOR_H_
#define UIP_DS6_NEIGHBOR_H_
#include "contiki.h"
#include "net/ipv6/uip.h"
#include "net/ipv6/uip-nd6.h"
#include "net/nbr-table.h"
#include "sys/stimer.h"
#if UIP_CONF_IPV6_QUEUE_PKT
#include "net/ipv6/uip-packetqueue.h"
#endif /*UIP_CONF_QUEUE_PKT */
#if UIP_DS6_NBR_CONF_MULTI_IPV6_ADDRS
#include "lib/assert.h"
#include "lib/list.h"
#endif
/*--------------------------------------------------*/
/** \brief Possible states for the nbr cache entries */
#define NBR_INCOMPLETE 0
#define NBR_REACHABLE 1
#define NBR_STALE 2
#define NBR_DELAY 3
#define NBR_PROBE 4
/** \brief Set non-zero (1) to enable multiple IPv6 addresses to be
* associated with a link-layer address */
#ifdef UIP_DS6_NBR_CONF_MULTI_IPV6_ADDRS
#define UIP_DS6_NBR_MULTI_IPV6_ADDRS UIP_DS6_NBR_CONF_MULTI_IPV6_ADDRS
#else
#define UIP_DS6_NBR_MULTI_IPV6_ADDRS 0
#endif /* UIP_DS6_NBR_CONF_MULTI_IPV6_ADDRS */
/** \brief Set the maximum number of IPv6 addresses per link-layer
* address */
#ifdef UIP_DS6_NBR_CONF_MAX_6ADDRS_PER_NBR
#define UIP_DS6_NBR_MAX_6ADDRS_PER_NBR UIP_DS6_NBR_CONF_MAX_6ADDRS_PER_NBR
#else
#define UIP_DS6_NBR_MAX_6ADDRS_PER_NBR 2
#endif /* UIP_DS6_NBR_CONF_MAX_6ADDRS_PER_NBR */
/** \brief Set the maximum number of neighbor cache entries */
#ifdef UIP_DS6_NBR_CONF_MAX_NEIGHBOR_CACHES
#define UIP_DS6_NBR_MAX_NEIGHBOR_CACHES UIP_DS6_NBR_CONF_MAX_NEIGHBOR_CACHES
#else
#define UIP_DS6_NBR_MAX_NEIGHBOR_CACHES \
(NBR_TABLE_MAX_NEIGHBORS * UIP_DS6_NBR_MAX_6ADDRS_PER_NBR)
#endif /* UIP_DS6_NBR_CONF_MAX_NEIGHBOR_CACHES */
#if UIP_DS6_NBR_MULTI_IPV6_ADDRS
/** \brief nbr_table entry when UIP_DS6_NBR_MULTI_IPV6_ADDRS is
* enabled. uip_ds6_nbrs is a list of uip_ds6_nbr_t objects */
typedef struct {
LIST_STRUCT(uip_ds6_nbrs);
} uip_ds6_nbr_entry_t;
#endif /* UIP_DS6_NBR_MULTI_IPV6_ADDRS */
/** \brief The default nbr_table entry (when
* UIP_DS6_NBR_MULTI_IPV6_ADDRS is disabled), that implements nbr
* cache */
typedef struct uip_ds6_nbr {
#if UIP_DS6_NBR_MULTI_IPV6_ADDRS
struct uip_ds6_nbr *next;
uip_ds6_nbr_entry_t *nbr_entry;
#endif /* UIP_DS6_NBR_MULTI_IPV6_ADDRS */
uip_ipaddr_t ipaddr;
uint8_t isrouter;
uint8_t state;
#if UIP_ND6_SEND_NS || UIP_ND6_SEND_RA
struct stimer reachable;
struct stimer sendns;
uint8_t nscount;
#endif /* UIP_ND6_SEND_NS || UIP_ND6_SEND_RA */
#if UIP_CONF_IPV6_QUEUE_PKT
struct uip_packetqueue_handle packethandle;
#define UIP_DS6_NBR_PACKET_LIFETIME CLOCK_SECOND * 4
#endif /*UIP_CONF_QUEUE_PKT */
} uip_ds6_nbr_t;
void uip_ds6_neighbors_init(void);
/**
* Add a neighbor cache for a specified IPv6 address, which is
* associated with a specified link-layer address
* \param ipaddr IPv6 address of a neighbor to add
* \param lladdr Link-layer address to associate with ipaddr
* \param isrouter Set 1 if the neighbor is a router
* \param state Set the initial neighbor cache state (e.g.,
* NBR_INCOMPLETE)
* \param reason Set a reason of the addition (e.g.,
* NBR_TABLE_REASON_RPL_DIO)
* \param data Set data associated with the nbr cache
* \return the address of a newly added nbr cache on success, NULL on
* failure
*/
uip_ds6_nbr_t *uip_ds6_nbr_add(const uip_ipaddr_t *ipaddr,
const uip_lladdr_t *lladdr,
uint8_t isrouter, uint8_t state,
nbr_table_reason_t reason, void *data);
/**
* Remove a neighbor cache
* \param nbr the address of a neighbor cache to remove
* \return 1 on success, 0 on failure (nothing was removed)
*/
int uip_ds6_nbr_rm(uip_ds6_nbr_t *nbr);
/**
* Get the link-layer address associated with a specified nbr cache
* \param nbr the address of a neighbor cache
* \return pointer to the link-layer address on success, NULL on failure
*/
const uip_lladdr_t *uip_ds6_nbr_get_ll(const uip_ds6_nbr_t *nbr);
/**
* Get the link-layer address associated with a specified IPv6 address
* \param ipaddr an IPv6 address used as a search key
* \return the pointer to the link-layer address on success, NULL on failure
*/
const uip_lladdr_t *uip_ds6_nbr_lladdr_from_ipaddr(const uip_ipaddr_t *ipaddr);
/**
* Update the link-layer address associated with an IPv6 address
* \param nbr the double pointer to a neighbor cache which has the
* target IPv6 address
* \param new_ll_addr the new link-layer address of the IPv6 address
* return 0 on success, -1 on failure
*/
int uip_ds6_nbr_update_ll(uip_ds6_nbr_t **nbr, const uip_lladdr_t *new_ll_addr);
/**
* Get an IPv6 address of a neighbor cache
* \param nbr the pointer to a neighbor cache
* \return the pointer to an IPv6 address associated with the neighbor cache
* \note This returns the first IPv6 address found in the neighbor
* cache when UIP_DS6_NBR_MULTI_IPV6_ADDRS is enabled
*/
const uip_ipaddr_t *uip_ds6_nbr_get_ipaddr(const uip_ds6_nbr_t *nbr);
/**
* Get an IPv6 address associated with a specified link-layer address
* \param lladdr a link-layer address used as a search key
* \return the pointer to an IPv6 address associated with the neighbor cache
* \note This returns the first IPv6 address found in the neighbor
* cache when UIP_DS6_NBR_MULTI_IPV6_ADDRS is enabled
*/
uip_ipaddr_t *uip_ds6_nbr_ipaddr_from_lladdr(const uip_lladdr_t *lladdr);
/**
* Get the neighbor cache associated with a specified IPv6 address
* \param ipaddr an IPv6 address used as a search key
* \return the pointer to a neighbor cache on success, NULL on failure
*/
uip_ds6_nbr_t *uip_ds6_nbr_lookup(const uip_ipaddr_t *ipaddr);
/**
* Get the neighbor cache associated with a specified link-layer address
* \param lladdr a link-layer address used as a search key
* \return the pointer to a neighbor cache on success, NULL on failure
*/
uip_ds6_nbr_t *uip_ds6_nbr_ll_lookup(const uip_lladdr_t *lladdr);
/**
* Return the number of neighbor caches
* \return the number of neighbor caches in use
*/
int uip_ds6_nbr_num(void);
/**
* Get the first neighbor cache in nbr_table
* \return the pointer to the first neighbor cache entry
*/
uip_ds6_nbr_t *uip_ds6_nbr_head(void);
/**
* Get the next neighbor cache of a specified one
* \param nbr the pointer to a neighbor cache
* \return the pointer to the next one on success, NULL on failure
*/
uip_ds6_nbr_t *uip_ds6_nbr_next(uip_ds6_nbr_t *nbr);
/**
* The callback function to update link-layer stats in a neighbor
* cache
* \param status MAC return value defined in mac.h
* \param numtx the number of transmissions happened for a packet
*/
void uip_ds6_link_callback(int status, int numtx);
/**
* The housekeeping function called periodically
*/
void uip_ds6_neighbor_periodic(void);
#if UIP_ND6_SEND_NS
/**
* \brief Refresh the reachable state of a neighbor. This function
* may be called when a node receives an IPv6 message that confirms the
* reachability of a neighbor.
* \param ipaddr pointer to the IPv6 address whose neighbor reachability state
* should be refreshed.
*/
void uip_ds6_nbr_refresh_reachable_state(const uip_ipaddr_t *ipaddr);
#endif /* UIP_ND6_SEND_NS */
/**
* \brief
* This searches inside the neighbor table for the neighbor that is about to
* expire the next.
*
* \return
* A reference to the neighbor about to expire the next or NULL if
* table is empty.
*/
uip_ds6_nbr_t *uip_ds6_get_least_lifetime_neighbor(void);
#endif /* UIP_DS6_NEIGHBOR_H_ */
/** @} */