236 lines
8.1 KiB
C
236 lines
8.1 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.
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <nuttx/net/netdev.h>
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#include <nuttx/net/sixlowpan.h>
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#include <nuttx/net/neighbor.h>
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#ifdef CONFIG_NET_IPv6
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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_s g_neighbors[CONFIG_NET_IPv6_NCONF_ENTRIES];
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct net_driver_s; /* Forward reference */
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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_s *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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* dev - Driver instance associated with the MAC
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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 struct net_driver_s *dev, FAR net_ipv6addr_t ipaddr,
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FAR uint8_t *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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* laddr - Location to return the corresponding link layer address.
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* This address may be NULL. In that case, this function may be
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* used simply to determine if the link layer address is
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* available.
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*
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* Returned Value:
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* Zero (OK) if the link layer address is returned. A negated errno value
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* is returned on any error.
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*
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****************************************************************************/
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int neighbor_lookup(FAR const net_ipv6addr_t ipaddr,
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FAR struct neighbor_addr_s *laddr);
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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_ethernet_out
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*
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* Description:
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* This function should be called before sending out an IPv6 packet. The
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* function checks the destination IPv6 address of the IPv6 packet to see
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* what Ethernet MAC address that should be used as a destination MAC
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* address on the Ethernet.
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*
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* If the destination IPv6 address is in the local network (determined
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* by logical ANDing of netmask and our IPv6 address), the function
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* checks the Neighbor Table to see if an entry for the destination IPv6
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* address is found. If so, an Ethernet header is pre-pended at the
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* beginning of the packet and the function returns.
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*
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* If no Neighbor Table entry is found for the destination IPv6 address,
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* the packet in the d_buf is replaced by an ICMPv6 Neighbor Solicit
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* request packet for the IPv6 address. The IPv6 packet is dropped and
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* it is assumed that the higher level protocols (e.g., TCP) eventually
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* will retransmit the dropped packet.
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*
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* Upon return in either the case, a packet to be sent is present in the
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* d_buf buffer and the d_len field holds the length of the Ethernet
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* frame that should be transmitted.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ETHERNET
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void neighbor_ethernet_out(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: neighbor_snapshot
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*
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* Description:
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* Take a snapshot of the current state of the Neighbor table.
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*
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* Input Parameters:
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* snapshot - Location to return the Neighbor table copy
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* nentries - The size of the user provided 'dest' in entries, each of
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* size sizeof(struct neighbor_entry_s)
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*
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* Returned Value:
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* On success, the number of entries actually copied is returned. Unused
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* entries are not returned.
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*
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* Assumptions
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* The network is locked to assure exclusive access to the ARP table
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*
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****************************************************************************/
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#ifdef CONFIG_NETLINK_ROUTE
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unsigned int neighbor_snapshot(FAR struct neighbor_entry_s *snapshot,
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unsigned int nentries);
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#endif
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/****************************************************************************
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* Name: neighbor_dumpentry
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*
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* Description:
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* Dump the contents of an entry Neighbor Table.
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*
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* Input Parameters:
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* msg - Message to print with the entry
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* neighbor - The table entry to dump
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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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#ifdef CONFIG_DEBUG_NET_INFO
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void neighbor_dumpentry(FAR const char *msg,
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FAR struct neighbor_entry_s *neighbor);
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#else
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# define neighbor_dumpentry(msg,neighbor)
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#endif
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/****************************************************************************
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* Name: neighbor_dumpipaddr
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*
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* Description:
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* Dump an IP address.
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*
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* Input Parameters:
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* msg - Message to print with the entry
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* ipaddr - The IP address to dump
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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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#ifdef CONFIG_DEBUG_NET_INFO
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void neighbor_dumpipaddr(FAR const char *msg,
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const net_ipv6addr_t ipaddr);
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#else
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# define neighbor_dumpipaddr(msg,ipaddr)
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#endif
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#endif /* CONFIG_NET_IPv6 */
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#endif /* __NET_NEIGHBOR_NEIGHBOR_H */
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