/**************************************************************************** * net/neighbor/neighbor.h * * SPDX-License-Identifier: Apache-2.0 * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __NET_NEIGHBOR_NEIGHBOR_H #define __NET_NEIGHBOR_NEIGHBOR_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #ifdef CONFIG_NET_IPv6 /**************************************************************************** * Public Data ****************************************************************************/ /* This is the Neighbor table. The network should be locked when accessing * this table. */ extern struct neighbor_entry_s g_neighbors[CONFIG_NET_IPv6_NCONF_ENTRIES]; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ struct net_driver_s; /* Forward reference */ /**************************************************************************** * 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_s *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: * dev - Driver instance associated with the MAC * ipaddr - The IPv6 address of the mapping. * addr - The link layer address of the mapping * * Returned Value: * None * ****************************************************************************/ void neighbor_add(FAR struct net_driver_s *dev, FAR net_ipv6addr_t ipaddr, FAR uint8_t *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; * laddr - Location to return the corresponding link layer address. * This address may be NULL. In that case, this function may be * used simply to determine if the link layer address is * available. * * Returned Value: * Zero (OK) if the link layer address is returned. A negated errno value * is returned on any error. * ****************************************************************************/ int neighbor_lookup(FAR const net_ipv6addr_t ipaddr, FAR struct neighbor_addr_s *laddr); /**************************************************************************** * 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_ethernet_out * * Description: * This function should be called before sending out an IPv6 packet. The * function checks the destination IPv6 address of the IPv6 packet to see * what Ethernet MAC address that should be used as a destination MAC * address on the Ethernet. * * If the destination IPv6 address is in the local network (determined * by logical ANDing of netmask and our IPv6 address), the function * checks the Neighbor Table to see if an entry for the destination IPv6 * address is found. If so, an Ethernet header is pre-pended at the * beginning of the packet and the function returns. * * If no Neighbor Table entry is found for the destination IPv6 address, * the packet in the d_buf is replaced by an ICMPv6 Neighbor Solicit * request packet for the IPv6 address. The IPv6 packet is dropped and * it is assumed that the higher level protocols (e.g., TCP) eventually * will retransmit the dropped packet. * * Upon return in either the case, a packet to be sent is present in the * d_buf buffer and the d_len field holds the length of the Ethernet * frame that should be transmitted. * ****************************************************************************/ #ifdef CONFIG_NET_ETHERNET void neighbor_ethernet_out(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: neighbor_snapshot * * Description: * Take a snapshot of the current state of the Neighbor table. * * Input Parameters: * snapshot - Location to return the Neighbor table copy * nentries - The size of the user provided 'dest' in entries, each of * size sizeof(struct neighbor_entry_s) * * Returned Value: * On success, the number of entries actually copied is returned. Unused * entries are not returned. * * Assumptions * The network is locked to assure exclusive access to the ARP table * ****************************************************************************/ #ifdef CONFIG_NETLINK_ROUTE unsigned int neighbor_snapshot(FAR struct neighbor_entry_s *snapshot, unsigned int nentries); #endif /**************************************************************************** * Name: neighbor_dumpentry * * Description: * Dump the contents of an entry Neighbor Table. * * Input Parameters: * msg - Message to print with the entry * neighbor - The table entry to dump * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_DEBUG_NET_INFO void neighbor_dumpentry(FAR const char *msg, FAR struct neighbor_entry_s *neighbor); #else # define neighbor_dumpentry(msg,neighbor) #endif /**************************************************************************** * Name: neighbor_dumpipaddr * * Description: * Dump an IP address. * * Input Parameters: * msg - Message to print with the entry * ipaddr - The IP address to dump * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_DEBUG_NET_INFO void neighbor_dumpipaddr(FAR const char *msg, const net_ipv6addr_t ipaddr); #else # define neighbor_dumpipaddr(msg,ipaddr) #endif #endif /* CONFIG_NET_IPv6 */ #endif /* __NET_NEIGHBOR_NEIGHBOR_H */