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px4-firmware/nuttx/include/net/uip/uip-arp.h

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/****************************************************************************
* include/net/uip/uip-arch.h
* Macros and definitions for the ARP module.
*
* Copyright (C) 2007, 2009-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Derived from uIP with has a similar BSD-styple license:
*
* Author: Adam Dunkels <adam@dunkels.com>
* Copyright (c) 2001-2003, Adam Dunkels.
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __UIP_ARP_H__
#define __UIP_ARP_H__
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdint.h>
#include <net/ethernet.h>
#include <net/uip/uipopt.h>
#include <net/uip/uip.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Recognized values of the type bytes in the Ethernet header */
#define UIP_ETHTYPE_ARP 0x0806
#define UIP_ETHTYPE_IP 0x0800
#define UIP_ETHTYPE_IP6 0x86dd
/****************************************************************************
* Public Types
****************************************************************************/
/* The Ethernet header -- 14 bytes. The first two fields are type 'struct
* ether_addr but are represented as a simple byte array here because
* some compilers refuse to pack 6 byte structures.
*/
struct uip_eth_hdr
{
uint8_t dest[6]; /* Ethernet destination address (6 bytes) */
uint8_t src[6]; /* Ethernet source address (6 bytes) */
uint16_t type; /* Type code (2 bytes) */
};
/* One entry in the ARP table (volatile!) */
struct arp_entry
{
in_addr_t at_ipaddr; /* IP address */
struct ether_addr at_ethaddr; /* Hardware address */
uint8_t at_time;
};
/****************************************************************************
* Public Data
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef CONFIG_NET_ARP
/****************************************************************************
* Name: uip_arp_init
*
* Description:
* Initialize the ARP module. This function must be called before any of
* the other ARP functions.
*
****************************************************************************/
EXTERN void uip_arp_init(void);
/****************************************************************************
* Name: uip_arp_ipin
*
* Description:
* The uip_arp_ipin() function should be called whenever an IP packet
* arrives from the Ethernet. This function refreshes the ARP table or
* inserts a new mapping if none exists. The function assumes that an
* IP packet with an Ethernet header is present in the d_buf buffer
* and that the length of the packet is in the d_len field.
*
****************************************************************************/
#ifdef CONFIG_NET_ARP_IPIN
EXTERN void uip_arp_ipin(struct uip_driver_s *dev);
#else
# define uip_arp_ipin(dev)
#endif
/****************************************************************************
* Name: uip_arp_arpin
*
* Description:
* The uip_arp_arpin() should be called when an ARP packet is received
* by the Ethernet driver. This function also assumes that the
* Ethernet frame is present in the d_buf buffer. When the
* uip_arp_arpin() function returns, the contents of the d_buf
* buffer should be sent out on the Ethernet if the d_len field
* is > 0.
*
****************************************************************************/
EXTERN void uip_arp_arpin(struct uip_driver_s *dev);
/****************************************************************************
* Name: uip_arp_arpin
*
* Description:
* The uip_arp_out() function should be called when an IP packet
* should be sent out on the Ethernet. This function creates an
* Ethernet header before the IP header in the d_buf buffer. The
* Ethernet header will have the correct Ethernet MAC destination
* address filled in if an ARP table entry for the destination IP
* address (or the IP address of the default router) is present. If no
* such table entry is found, the IP packet is overwritten with an ARP
* request and we rely on TCP to retransmit the packet that was
* overwritten. In any case, the d_len field holds the length of
* the Ethernet frame that should be transmitted.
*
****************************************************************************/
EXTERN void uip_arp_out(struct uip_driver_s *dev);
/****************************************************************************
* Name: uip_arp_timer
*
* Description:
* This function performs periodic timer processing in the ARP module
* and should be called at regular intervals. The recommended interval
* is 10 seconds between the calls. It is responsible for flushing old
* entries in the ARP table.
*
****************************************************************************/
EXTERN void uip_arp_timer(void);
/****************************************************************************
* Name: uip_arp_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]
*
* Assumptions
* Interrupts are disabled
*
****************************************************************************/
EXTERN void uip_arp_update(uint16_t *pipaddr, uint8_t *ethaddr);
/****************************************************************************
* Name: uip_arp_find
*
* Description:
* Find the ARP entry corresponding to this IP address.
*
* Input parameters:
* ipaddr - Refers to an IP address in network order
*
* Assumptions
* Interrupts are disabled; Returned value will become unstable when
* interrupts are re-enabled or if any other uIP APIs are called.
*
****************************************************************************/
EXTERN struct arp_entry *uip_arp_find(in_addr_t ipaddr);
/****************************************************************************
* Name: uip_arp_delete
*
* Description:
* Remove an IP association from the ARP table
*
* Input parameters:
* ipaddr - Refers to an IP address in network order
*
* Assumptions
* Interrupts are disabled
*
****************************************************************************/
#define uip_arp_delete(ipaddr) \
{ \
struct arp_entry *tabptr = uip_arp_find(ipaddr); \
if (tabptr) \
{ \
tabptr->at_ipaddr = 0; \
} \
}
#else /* CONFIG_NET_ARP */
/* If ARP is disabled, stub out all ARP interfaces */
# define uip_arp_init()
# define uip_arp_ipin(dev)
# define uip_arp_arpin(dev)
# define uip_arp_out(dev)
# define uip_arp_timer()
# define uip_arp_update(pipaddr,ethaddr)
# define uip_arp_find(ipaddr) NULL
# define uip_arp_delete(ipaddr)
#endif /* CONFIG_NET_ARP */
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __UIP_ARP_H__ */
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