/**************************************************************************** * net/neighbor/neighbor.h * Header file for database of link-local neighbors, used by IPv6 code and * to be used by future ARP code. * * Copyright (C) 2007-2009, 2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * A leverage of logic from uIP which also has a BSD style license * * Author: Adam Dunkels * Copyright (c) 2006, 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. * ****************************************************************************/ #ifndef __NET_NEIGHBOR_NEIGHBOR_H #define __NET_NEIGHBOR_NEIGHBOR_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #ifdef CONFIG_NET_IPv6 /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #ifndef CONFIG_NET_IPv6_NCONF_ENTRIES # define CONFIG_NET_IPv6_NCONF_ENTRIES 8 #endif #define NEIGHBOR_MAXTIME 128 /**************************************************************************** * Public Types ****************************************************************************/ /* Describes the link layer address */ struct neighbor_addr_s { #if CONFIG_NET_IPv6_NEIGHBOR_ADDRTYPE CONFIG_NET_IPv6_NEIGHBOR_ADDRTYPE na_addr; #else struct ether_addr na_addr; #endif }; /* This structure describes on entry in the neighbor table. This is intended * for internal use within the Neighbor implementation. */ struct neighbor_entry { net_ipv6addr_t ne_ipaddr; /* IPv6 address of the Neighbor */ struct neighbor_addr_s ne_addr; /* Link layer address of the Neighbor */ uint8_t ne_time; /* For aging, units of half seconds */ }; /**************************************************************************** * Public Data ****************************************************************************/ /* This is the Neighbor table. The network should be locked when accessing * this table. */ extern struct neighbor_entry g_neighbors[CONFIG_NET_IPv6_NCONF_ENTRIES]; /* This is the time, in clock ticks, of the last poll */ extern uint32_t g_neighbor_polltime; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: neighbor_initialize * * Description: * Initialize Neighbor table support * * Input Parameters: * None * * Returned Value: * None * ****************************************************************************/ void neighbor_initialize(void); /**************************************************************************** * Name: neighbor_findentry * * Description: * Find an entry in the Neighbor Table. This interface is internal to * the neighbor implementation; Consider using neighbor_lookup() instead; * * Input Parameters: * ipaddr - The IPv6 address to use in the lookup; * * Returned Value: * The Neighbor Table entry corresponding to the IPv6 address; NULL is * returned if there is no matching entry in the Neighbor Table. * ****************************************************************************/ FAR struct neighbor_entry *neighbor_findentry(const net_ipv6addr_t ipaddr); /**************************************************************************** * Name: neighbor_add * * Description: * Add the new address association to the Neighbor Table (if it is not * already there). * * Input Parameters: * ipaddr - The IPv6 address of the mapping. * addr - The link layer address of the mapping * * Returned Value: * None * ****************************************************************************/ void neighbor_add(FAR net_ipv6addr_t ipaddr, FAR struct neighbor_addr_s *addr); /**************************************************************************** * Name: neighbor_lookup * * Description: * Find an entry in the Neighbor Table and return its link layer address. * * Input Parameters: * ipaddr - The IPv6 address to use in the lookup; * * Returned Value: * A read-only reference to the link layer address in the Neighbor Table is * returned on success. NULL is returned if there is no matching entry in * the Neighbor Table. * ****************************************************************************/ FAR const struct neighbor_addr_s *neighbor_lookup(const net_ipv6addr_t ipaddr); /**************************************************************************** * Name: neighbor_update * * Description: * Reset time on the Neighbor Table entry associated with the IPv6 address. * This makes the associated entry the most recently used and not a * candidate for removal. * * Input Parameters: * ipaddr - The IPv6 address of the entry to be updated * * Returned Value: * None * ****************************************************************************/ void neighbor_update(const net_ipv6addr_t ipaddr); /**************************************************************************** * Name: neighbor_periodic * * Description: * Called from the timer poll logic in order to perform agin operations on * entries in the Neighbor Table * * Input Parameters: * None * * Returned Value: * None * ****************************************************************************/ void neighbor_periodic(void); #endif /* CONFIG_NET_IPv6 */ #endif /* __NET_NEIGHBOR_NEIGHBOR_H */