217 lines
7.2 KiB
C
217 lines
7.2 KiB
C
/****************************************************************************
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* net/neighbor/neighbor.h
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* Header file for database of link-local neighbors, used by IPv6 code and
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* to be used by future ARP code.
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*
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* Copyright (C) 2007-2009, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* A leverage of logic from uIP which also has a BSD style license
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*
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* Author: Adam Dunkels <adam@sics.se>
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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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****************************************************************************/
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#ifndef __NET_NEIGHBOR_NEIGHBOR_H
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#define __NET_NEIGHBOR_NEIGHBOR_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <net/ethernet.h>
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#include <nuttx/net/ip.h>
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#ifdef CONFIG_NET_IPv6
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_NET_IPv6_NCONF_ENTRIES
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# define CONFIG_NET_IPv6_NCONF_ENTRIES 8
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#endif
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#define NEIGHBOR_MAXTIME 128
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Describes the link layer address */
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struct neighbor_addr_s
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{
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#if CONFIG_NET_IPv6_NEIGHBOR_ADDRTYPE
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CONFIG_NET_IPv6_NEIGHBOR_ADDRTYPE na_addr;
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#else
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struct ether_addr na_addr;
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#endif
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};
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/* This structure describes on entry in the neighbor table. This is intended
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* for internal use within the Neighbor implementation.
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*/
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struct neighbor_entry
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{
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net_ipv6addr_t ne_ipaddr; /* IPv6 address of the Neighbor */
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struct neighbor_addr_s ne_addr; /* Link layer address of the Neighbor */
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uint8_t ne_time; /* For aging, units of half seconds */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* This is the Neighbor table. The network should be locked when accessing
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* this table.
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*/
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extern struct neighbor_entry g_neighbors[CONFIG_NET_IPv6_NCONF_ENTRIES];
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/* This is the time, in clock ticks, of the last poll */
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extern uint32_t g_neighbor_polltime;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: neighbor_initialize
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*
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* Description:
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* Initialize Neighbor table support
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void neighbor_initialize(void);
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/****************************************************************************
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* Name: neighbor_findentry
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*
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* Description:
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* Find an entry in the Neighbor Table. This interface is internal to
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* the neighbor implementation; Consider using neighbor_lookup() instead;
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*
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* Input Parameters:
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* ipaddr - The IPv6 address to use in the lookup;
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*
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* Returned Value:
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* The Neighbor Table entry corresponding to the IPv6 address; NULL is
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* returned if there is no matching entry in the Neighbor Table.
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*
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****************************************************************************/
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FAR struct neighbor_entry *neighbor_findentry(const net_ipv6addr_t ipaddr);
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/****************************************************************************
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* Name: neighbor_add
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*
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* Description:
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* Add the new address association to the Neighbor Table (if it is not
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* already there).
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*
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* Input Parameters:
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* ipaddr - The IPv6 address of the mapping.
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* addr - The link layer address of the mapping
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void neighbor_add(FAR net_ipv6addr_t ipaddr, FAR struct neighbor_addr_s *addr);
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/****************************************************************************
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* Name: neighbor_lookup
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*
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* Description:
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* Find an entry in the Neighbor Table and return its link layer address.
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*
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* Input Parameters:
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* ipaddr - The IPv6 address to use in the lookup;
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*
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* Returned Value:
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* A read-only reference to the link layer address in the Neighbor Table is
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* returned on success. NULL is returned if there is no matching entry in
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* the Neighbor Table.
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*
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****************************************************************************/
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FAR const struct neighbor_addr_s *neighbor_lookup(const net_ipv6addr_t ipaddr);
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/****************************************************************************
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* Name: neighbor_update
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*
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* Description:
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* Reset time on the Neighbor Table entry associated with the IPv6 address.
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* This makes the associated entry the most recently used and not a
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* candidate for removal.
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*
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* Input Parameters:
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* ipaddr - The IPv6 address of the entry to be updated
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void neighbor_update(const net_ipv6addr_t ipaddr);
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/****************************************************************************
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* Name: neighbor_periodic
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*
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* Description:
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* Called from the timer poll logic in order to perform agin operations on
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* entries in the Neighbor Table
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void neighbor_periodic(void);
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#endif /* CONFIG_NET_IPv6 */
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#endif /* __NET_NEIGHBOR_NEIGHBOR_H */
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