255 lines
9.1 KiB
C
255 lines
9.1 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 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, 2017 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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#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 arp_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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