470 lines
15 KiB
C
470 lines
15 KiB
C
/****************************************************************************
|
|
* net/arp/arp.h
|
|
*
|
|
* 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_ARP_ARP_H
|
|
#define __NET_ARP_ARP_H
|
|
|
|
/* The Address Resolution Protocol ARP is used for mapping between IP
|
|
* addresses and link level addresses such as the Ethernet MAC
|
|
* addresses. ARP uses broadcast queries to ask for the link level
|
|
* address of a known IP address and the host which is configured with
|
|
* the IP address for which the query was meant, will respond with its
|
|
* link level address.
|
|
*
|
|
* Note: This ARP implementation only supports Ethernet.
|
|
*/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <queue.h>
|
|
#include <errno.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
#include <nuttx/semaphore.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifndef CONFIG_DEBUG_FEATURES
|
|
# undef CONFIG_NET_ARP_DUMP
|
|
#endif
|
|
|
|
#ifndef CONFIG_ARP_SEND_MAXTRIES
|
|
# define CONFIG_ARP_SEND_MAXTRIES 5
|
|
#endif
|
|
|
|
#ifndef CONFIG_ARP_SEND_DELAYMSEC
|
|
# define CONFIG_ARP_SEND_DELAYMSEC 20
|
|
#endif
|
|
|
|
/* ARP Definitions **********************************************************/
|
|
|
|
#define ARP_REQUEST 1
|
|
#define ARP_REPLY 2
|
|
|
|
#define ARP_HWTYPE_ETH 1
|
|
|
|
#define RASIZE 4 /* Size of ROUTER ALERT */
|
|
|
|
/* Allocate a new ARP data callback */
|
|
|
|
#define arp_callback_alloc(dev) devif_callback_alloc(dev, &(dev)->d_conncb)
|
|
#define arp_callback_free(dev,cb) devif_dev_callback_free(dev, cb)
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* ARP header -- Size 28 bytes */
|
|
|
|
struct arp_hdr_s
|
|
{
|
|
uint16_t ah_hwtype; /* 16-bit Hardware type (Ethernet=0x001) */
|
|
uint16_t ah_protocol; /* 16-bit Protocol type (IP=0x0800) */
|
|
uint8_t ah_hwlen; /* 8-bit Hardware address size (6) */
|
|
uint8_t ah_protolen; /* 8-bit Procotol address size (4) */
|
|
uint16_t ah_opcode; /* 16-bit Operation */
|
|
uint8_t ah_shwaddr[6]; /* 48-bit Sender hardware address */
|
|
uint16_t ah_sipaddr[2]; /* 32-bit Sender IP address */
|
|
uint8_t ah_dhwaddr[6]; /* 48-bit Target hardware address */
|
|
uint16_t ah_dipaddr[2]; /* 32-bit Target IP address */
|
|
};
|
|
|
|
/* IP header -- Size 20 or 24 bytes */
|
|
|
|
struct arp_iphdr_s
|
|
{
|
|
uint8_t eh_vhl; /* 8-bit Version (4) and header length (5 or 6) */
|
|
uint8_t eh_tos; /* 8-bit Type of service (e.g., 6=TCP) */
|
|
uint8_t eh_len[2]; /* 16-bit Total length */
|
|
uint8_t eh_ipid[2]; /* 16-bit Identification */
|
|
uint8_t eh_ipoffset[2]; /* 16-bit IP flags + fragment offset */
|
|
uint8_t eh_ttl; /* 8-bit Time to Live */
|
|
uint8_t eh_proto; /* 8-bit Protocol */
|
|
uint16_t eh_ipchksum; /* 16-bit Header checksum */
|
|
uint16_t eh_srcipaddr[2]; /* 32-bit Source IP address */
|
|
uint16_t eh_destipaddr[2]; /* 32-bit Destination IP address */
|
|
uint16_t eh_ipoption[2]; /* (optional) */
|
|
};
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
/* This structure holds the state of the send operation until it can be
|
|
* operated upon from the network driver poll.
|
|
*/
|
|
|
|
struct arp_send_s
|
|
{
|
|
FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
|
|
sem_t snd_sem; /* Used to wake up the waiting thread */
|
|
uint8_t snd_retries; /* Retry count */
|
|
volatile bool snd_sent; /* True: if request sent */
|
|
uint8_t snd_ifname[IFNAMSIZ]; /* Interface name */
|
|
int16_t snd_result; /* The result of the send operation */
|
|
in_addr_t snd_ipaddr; /* The IP address to be queried */
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
/* Used to notify a thread waiting for a particular ARP response */
|
|
|
|
struct arp_notify_s
|
|
{
|
|
FAR struct arp_notify_s *nt_flink; /* Supports singly linked list */
|
|
in_addr_t nt_ipaddr; /* Waited for IP address in the mapping */
|
|
sem_t nt_sem; /* Will wake up the waiter */
|
|
int nt_result; /* The result of the wait */
|
|
};
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP
|
|
/****************************************************************************
|
|
* Name: arp_format
|
|
*
|
|
* Description:
|
|
* Format an ARP packet.
|
|
*
|
|
* Input Parameters:
|
|
* dev - Device structure
|
|
* ipaddr - Target IP address (32-bit)
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
struct net_driver_s; /* Forward reference */
|
|
void arp_format(FAR struct net_driver_s *dev, in_addr_t ipaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_send
|
|
*
|
|
* Description:
|
|
* The arp_send() call may be to send an ARP request to resolve an IPv4
|
|
* address. This function first checks if the IPv4 address is already in
|
|
* the ARP table. If so, then it returns success immediately.
|
|
*
|
|
* If the requested IPv4 address in not in the ARP table, then this
|
|
* function will send an ARP request, delay, then check if the IP address
|
|
* is now in the ARP table. It will repeat this sequence until either (1)
|
|
* the IP address mapping is now in the ARP table, or (2) a configurable
|
|
* number of timeouts occur without receiving the ARP replay.
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr The IP address to be queried.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success and the IP address mapping can now be
|
|
* found in the ARP table. On error a negated errno value is returned:
|
|
*
|
|
* -ETIMEDOUT: The number or retry counts has been exceed.
|
|
* -EHOSTUNREACH: Could not find a route to the host
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the normal tasking context.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
int arp_send(in_addr_t ipaddr);
|
|
#else
|
|
# define arp_send(i) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_poll
|
|
*
|
|
* Description:
|
|
* Poll all pending transfer for ARP requests to send.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver indirectly through
|
|
* devif_poll() and devif_timer(). The network must be locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
int arp_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback);
|
|
#else
|
|
# define arp_poll(d,c) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_wait_setup
|
|
*
|
|
* Description:
|
|
* Called BEFORE an ARP request is sent. This function sets up the ARP
|
|
* response timeout before the ARP request is sent so that there is
|
|
* no race condition when arp_wait() is called.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from ARP send and executes in the normal
|
|
* tasking environment.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
void arp_wait_setup(in_addr_t ipaddr, FAR struct arp_notify_s *notify);
|
|
#else
|
|
# define arp_wait_setup(i,n)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_wait_cancel
|
|
*
|
|
* Description:
|
|
* Cancel any wait set after arp_wait_setup is called but before arm_wait()
|
|
* is called (arp_wait() will automatically cancel the wait).
|
|
*
|
|
* Assumptions:
|
|
* This function may execute in the interrupt context when called from
|
|
* arp_wait().
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
int arp_wait_cancel(FAR struct arp_notify_s *notify);
|
|
#else
|
|
# define arp_wait_cancel(n) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_wait
|
|
*
|
|
* Description:
|
|
* Called each time that a ARP request is sent. This function will sleep
|
|
* until either: (1) the matching ARP response is received, or (2) a
|
|
* timeout occurs.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from ARP send and must execute with the network
|
|
* un-locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
int arp_wait(FAR struct arp_notify_s *notify, unsigned int timeout);
|
|
#else
|
|
# define arp_wait(n,t) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_notify
|
|
*
|
|
* Description:
|
|
* Called each time that a ARP response is received in order to wake-up
|
|
* any threads that may be waiting for this particular ARP response.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver indirectly through
|
|
* arp_arpin() and will execute with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
void arp_notify(in_addr_t ipaddr);
|
|
#else
|
|
# define arp_notify(i)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_lookup
|
|
*
|
|
* Description:
|
|
* Find the ARP entry corresponding to this IP address in the ARP table.
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr - Refers to an IP address in network order
|
|
*
|
|
* Assumptions:
|
|
* The network is locked to assure exclusive access to the ARP table.
|
|
* The return value will become unstable when the network is unlocked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct arp_entry_s *arp_lookup(in_addr_t ipaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_find
|
|
*
|
|
* Description:
|
|
* Find the ARP entry corresponding to this IP address which may or may
|
|
* not be in the ARP table (it may, instead, be a local network device).
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr - Refers to an IP address in network order
|
|
* ethaddr - Location to return the corresponding Ethernet MAN address.
|
|
* This address may be NULL. In that case, this function may be
|
|
* used simply to determine if the Ethernet MAC address is
|
|
* available.
|
|
*
|
|
* Assumptions
|
|
* The network is locked to assure exclusive access to the ARP table.
|
|
*
|
|
****************************************************************************/
|
|
|
|
struct ether_addr; /* Forward reference */
|
|
int arp_find(in_addr_t ipaddr, FAR struct ether_addr *ethaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_delete
|
|
*
|
|
* Description:
|
|
* Remove an IP association from the ARP table
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr - Refers to an IP address in network order
|
|
*
|
|
* Assumptions
|
|
* The network is locked to assure exclusive access to the ARP table.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void arp_delete(in_addr_t ipaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_update
|
|
*
|
|
* Description:
|
|
* Add the IP/HW address mapping to the ARP table -OR- change the IP
|
|
* address of an existing association.
|
|
*
|
|
* Input Parameters:
|
|
* ipaddr - The IP address as an inaddr_t
|
|
* ethaddr - Refers to a HW address uint8_t[IFHWADDRLEN]
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) if the ARP table entry was successfully modified. A negated
|
|
* errno value is returned on any error.
|
|
*
|
|
* Assumptions
|
|
* The network is locked to assure exclusive access to the ARP table
|
|
*
|
|
****************************************************************************/
|
|
|
|
int arp_update(in_addr_t ipaddr, FAR uint8_t *ethaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_hdr_update
|
|
*
|
|
* Description:
|
|
* Add the IP/HW address mapping to the ARP table -OR- change the IP
|
|
* address of an existing association.
|
|
*
|
|
* Input Parameters:
|
|
* pipaddr - Refers to an IP address uint16_t[2] in network order
|
|
* ethaddr - Refers to a HW address uint8_t[IFHWADDRLEN]
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) if the ARP table entry was successfully modified. A negated
|
|
* errno value is returned on any error.
|
|
*
|
|
* Assumptions
|
|
* The network is locked to assure exclusive access to the ARP table
|
|
*
|
|
****************************************************************************/
|
|
|
|
void arp_hdr_update(FAR uint16_t *pipaddr, FAR uint8_t *ethaddr);
|
|
|
|
/****************************************************************************
|
|
* Name: arp_snapshot
|
|
*
|
|
* Description:
|
|
* Take a snapshot of the current state of the ARP table.
|
|
*
|
|
* Input Parameters:
|
|
* snapshot - Location to return the ARP table copy
|
|
* nentries - The size of the user provided 'dest' in entries, each of
|
|
* size sizeof(struct arp_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 arp_snapshot(FAR struct arp_entry_s *snapshot,
|
|
unsigned int nentries);
|
|
#else
|
|
# define arp_snapshot(s,n) (0)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: arp_dump
|
|
*
|
|
* Description:
|
|
* Dump the contents of an ARP packet to the SYSLOG device
|
|
*
|
|
* Input Parameters:
|
|
* arp - A reference to the ARP header to be dumped.
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_ARP_DUMP
|
|
void arp_dump(FAR struct arp_hdr_s *arp);
|
|
#else
|
|
# define arp_dump(arp)
|
|
#endif
|
|
|
|
#else /* CONFIG_NET_ARP */
|
|
|
|
/* If ARP is disabled, stub out all ARP interfaces */
|
|
|
|
# define arp_format(d,i);
|
|
# define arp_send(i) (0)
|
|
# define arp_poll(d,c) (0)
|
|
# define arp_wait_setup(i,n)
|
|
# define arp_wait_cancel(n) (0)
|
|
# define arp_wait(n,t) (0)
|
|
# define arp_notify(i)
|
|
# define arp_find(i,e) (-ENOSYS)
|
|
# define arp_delete(i)
|
|
# define arp_update(i,m);
|
|
# define arp_hdr_update(i,m);
|
|
# define arp_snapshot(s,n) (0)
|
|
# define arp_dump(arp)
|
|
|
|
#endif /* CONFIG_NET_ARP */
|
|
#endif /* __NET_ARP_ARP_H */
|