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Expose more ARP APIs

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1633 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-03-21 16:00:20 +00:00
parent 473c6ec4bb
commit 249eefc1d9
9 changed files with 572 additions and 194 deletions
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221
include/net/uip/uip-arp.h
View File

@ -1,13 +1,20 @@
/* uip-arp.h
/****************************************************************************
* include/net/uip/uip-arch.h
* Macros and definitions for the ARP module.
* Author: Adam Dunkels <adam@dunkels.com>
*
* Copyright (c) 2001-2003, Adam Dunkels.
* All rights reserved.
* Copyright (C) 2007, 2009 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
@ -29,16 +36,35 @@
* 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 <sys/types.h>
#include <nuttx/compiler.h>
#include <net/ethernet.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.
@ -51,55 +77,164 @@ struct uip_eth_hdr
uint16 type; /* Type code (2 bytes) */
};
/* Recognized values of the type bytes in the Ethernet header */
/* One entry in the ARP table (volatile!) */
#define UIP_ETHTYPE_ARP 0x0806
#define UIP_ETHTYPE_IP 0x0800
#define UIP_ETHTYPE_IP6 0x86dd
struct arp_entry
{
in_addr_t at_ipaddr; /* IP address */
struct ether_addr at_ethaddr; /* Hardware address */
uint8 at_time;
};
/* The uip_arp_init() function must be called before any of the other
* ARP functions.
*/
/****************************************************************************
* Public Data
****************************************************************************/
void uip_arp_init(void);
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/* 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.
*/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* 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_init
*
* 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.
*
****************************************************************************/
#define uip_arp_ipin()
/* 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.
*/
/****************************************************************************
* 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.
*
****************************************************************************/
void uip_arp_arpin(struct uip_driver_s *dev);
EXTERN void uip_arp_arpin(struct uip_driver_s *dev);
/* 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.
*/
/****************************************************************************
* 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.
*
****************************************************************************/
void uip_arp_out(struct uip_driver_s *dev);
EXTERN void uip_arp_out(struct uip_driver_s *dev);
/* The uip_arp_timer() function should be called every ten seconds. It
* is responsible for flushing old entries in the ARP table.
*/
/****************************************************************************
* 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.
*
****************************************************************************/
void uip_arp_timer(void);
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[2] in network order
* ethaddr - Refers to a HW address uint8[IFHWADDRLEN]
*
* Assumptions
* Interrupts are disabled
*
****************************************************************************/
EXTERN void uip_arp_update(uint16 *pipaddr, uint8 *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; \
} \
}
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __UIP_ARP_H__ */

110
include/netinet/arp.h Normal file
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@ -0,0 +1,110 @@
/****************************************************************************
* netinet/arp.h
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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 __NETINET_ARP_H
#define __NETINET_ARP_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <nuttx/ioctl.h>
/****************************************************************************
* Public Definitions
****************************************************************************/
/* Three ioctls are available on all PF_INET sockets, but only if the NuttX
* configuration CONFIG_NET_ARPIOCTLS is defined. Each ioctl takes a pointer
* to a 'struct arpreq' as its parameter.
*/
#define SIOCSARP _ARPIOC(1) /* Set a ARP mapping */
#define SIOCDARP _ARPIOC(2) /* Delete an ARP mapping */
#define SIOCGARP _ARPIOC(3) /* Get an ARP mapping */
/* Values for the FLAGS field in struct arpreq */
#define ATF_COM 0x01 /* Lookup complete */
#define ATF_PERM 0x02 /* Permanent entry */
#define ATF_PUBL 0x04 /* Publish entry */
#define ATF_USETRAILERS 0x10 /* Trailers requested */
#define ATF_NETMASK 0x20 /* Use a netmask */
#define ATF_DONTPUB 0x40 /* Don't answer */
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/* All ARP ioctls take a pointer to a struct arpreq as their parameter: */
struct arpreq
{
struct sockaddr arp_pa; /* Protocol address */
struct sockaddr arp_ha; /* Hardware address */
struct sockaddr arp_netmask; /* Netmask of protocol address */
ubyte arp_flags; /* Flags */
ubyte arp_dev[IFNAMSIZ+1]; /* Device name (zero terminated)*/
};
/****************************************************************************
* Public Data
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/* If CONFIG_NET_ARPIOCTLS is defined then the semi-standard ioctl commands
* described above are supported. If not, you can call the uIP ARP interfaces
* directly in a very non-standard way. See include/net/uip/uip-arp.h for
* prototypes.
*/
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __NETINET_ARP_H */

8
include/netinet/ether.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* netinet/ether.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -14,7 +14,7 @@
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
@ -33,8 +33,8 @@
*
****************************************************************************/
#ifndef __NETINET_ETHER_H
#define __NETINET_ETHER_H
#ifndef __NETINET_ETHER_H
#define __NETINET_ETHER_H
/****************************************************************************
* Included Files

4
include/netinet/ip6.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* netinet/ip6.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -14,7 +14,7 @@
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*

8
include/nuttx/ioctl.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/ioctl.h
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Copyright (C) 2008, 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -56,6 +56,7 @@
#define _DIOCBASE (0x8800) /* Character driver ioctl commands */
#define _BIOCBASE (0x8900) /* Block driver ioctl commands */
#define _SIOCBASE (0x8a00) /* Socket ioctl commandss */
#define _ARPBASE (0x8b00) /* ARP ioctl commandss */
/* Macros used to manage ioctl commands */
@ -100,6 +101,11 @@
* return (void*) base address
* of device memory */
/* NuttX ARP driver ioctl definitions (see netinet/arp.h) */
#define _ARPIOCVALID(c) (_IOC_TYPE(c)==_ARPBASE)
#define _ARPIOC(nr) _IOC(_ARPBASE,nr)
/****************************************************************************
* Public Type Definitions
****************************************************************************/

7
net/netdev_ioctl.c
View File

@ -253,6 +253,13 @@ int netdev_ioctl(int sockfd, int cmd, struct ifreq *req)
err = ENOSYS;
goto errout;
#ifdef CONFIG_NET_ARPIOCTLS
case SIOCSARP: /* Set a ARP mapping */
case SIOCDARP: /* Delete an ARP mapping */
case SIOCGARP: /* Get an ARP mapping */
# error "IOCTL Commands not implemented"
#endif
default:
err = EINVAL;
goto errout;

6
net/uip/Make.defs
View File

@ -1,7 +1,7 @@
############################################################################
# Make.defs
#
# Copyright (C) 2007 Gregory Nutt. All rights reserved.
# Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <spudmonkey@racsa.co.cr>
#
# Redistribution and use in source and binary forms, with or without
@ -40,8 +40,8 @@ ifeq ($(CONFIG_NET),y)
# Common IP source files
UIP_CSRCS += uip_initialize.c uip_setipid.c uip_arp.c uip_input.c uip_send.c \
uip_poll.c uip_chksum.c uip_callback.c
UIP_CSRCS += uip_initialize.c uip_setipid.c uip_arp.c uip_arptab.c uip_input.c \
uip_send.c uip_poll.c uip_chksum.c uip_callback.c
ifeq ($(CONFIG_NET_IPv6),y)
UIP_CSRCS += uip_neighbor.c

149
net/uip/uip_arp.c
View File

@ -115,13 +115,6 @@ struct ethip_hdr
uint16 eh_ipoption[2]; /* (optional) */
};
struct arp_entry
{
in_addr_t at_ipaddr;
struct ether_addr at_ethaddr;
uint8 at_time;
};
/****************************************************************************
* Private Data
****************************************************************************/
@ -152,11 +145,6 @@ static const uint16 g_broadcast_ipaddr[2] = {0xffff, 0xffff};
static const ubyte g_multicast_ethaddr[3] = {0x01, 0x00, 0x5e};
#endif
/* The table of known address mappings */
static struct arp_entry g_arptable[CONFIG_NET_ARPTAB_SIZE];
static uint8 g_arptime;
/****************************************************************************
* Private Functions
****************************************************************************/
@ -183,122 +171,10 @@ static void uip_arp_dump(struct arp_hdr *arp)
# define uip_arp_dump(arp)
#endif
static void uip_arp_update(uint16 *pipaddr, uint8 *ethaddr)
{
struct arp_entry *tabptr = NULL;
in_addr_t ipaddr = uip_ip4addr_conv(pipaddr);
int i;
/* Walk through the ARP mapping table and try to find an entry to
* update. If none is found, the IP -> MAC address mapping is
* inserted in the ARP table.
*/
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
/* Only check those entries that are actually in use. */
if (tabptr->at_ipaddr != 0)
{
/* Check if the source IP address of the incoming packet matches
* the IP address in this ARP table entry.
*/
if (uip_ipaddr_cmp(ipaddr, tabptr->at_ipaddr))
{
/* An old entry found, update this and return. */
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
return;
}
}
}
/* If we get here, no existing ARP table entry was found, so we
create one. */
/* First, we try to find an unused entry in the ARP table. */
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (tabptr->at_ipaddr == 0)
{
break;
}
}
/* If no unused entry is found, we try to find the oldest entry and
* throw it away.
*/
if (i == CONFIG_NET_ARPTAB_SIZE)
{
uint8 tmpage = 0;
int j = 0;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (g_arptime - tabptr->at_time > tmpage)
{
tmpage = g_arptime - tabptr->at_time;
j = i;
}
}
i = j;
tabptr = &g_arptable[i];
}
/* Now, i is the ARP table entry which we will fill with the new
* information.
*/
tabptr->at_ipaddr = ipaddr;
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/* Initialize the ARP module. */
void uip_arp_init(void)
{
int i;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
memset(&g_arptable[i].at_ipaddr, 0, sizeof(in_addr_t));
}
}
/* Periodic ARP processing function.
*
* 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.
*/
void uip_arp_timer(void)
{
struct arp_entry *tabptr;
int i;
++g_arptime;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (tabptr->at_ipaddr != 0 && g_arptime - tabptr->at_time >= UIP_ARP_MAXAGE)
{
tabptr->at_ipaddr = 0;
}
}
}
/* ARP processing for incoming ARP packets.
*
* This function should be called by the device driver when an ARP
@ -410,13 +286,12 @@ void uip_arp_arpin(struct uip_driver_s *dev)
void uip_arp_out(struct uip_driver_s *dev)
{
struct arp_entry *tabptr = NULL;
struct arp_hdr *parp = ARPBUF;
struct uip_eth_hdr *peth = ETHBUF;
struct ethip_hdr *pip = IPBUF;
in_addr_t ipaddr;
in_addr_t destipaddr;
int i;
const struct arp_entry *tabptr = NULL;
struct arp_hdr *parp = ARPBUF;
struct uip_eth_hdr *peth = ETHBUF;
struct ethip_hdr *pip = IPBUF;
in_addr_t ipaddr;
in_addr_t destipaddr;
/* Find the destination IP address in the ARP table and construct
* the Ethernet header. If the destination IP addres isn't on the
@ -478,16 +353,8 @@ void uip_arp_out(struct uip_driver_s *dev)
/* Check if we already have this destination address in the ARP table */
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (uip_ipaddr_cmp(ipaddr, tabptr->at_ipaddr))
{
break;
}
}
if (i == CONFIG_NET_ARPTAB_SIZE)
tabptr = uip_arp_find(ipaddr);
if (!tabptr)
{
nvdbg("ARP request for IP %04lx\n", (long)ipaddr);

253
net/uip/uip_arptab.c Normal file
View File

@ -0,0 +1,253 @@
/****************************************************************************
* net/uip/uip_arptab.c
* Implementation of the ARP Address Resolution Protocol.
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Based originally on uIP which also has a BSD style 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/ioctl.h>
#include <string.h>
#include <debug.h>
#include <netinet/in.h>
#include <net/ethernet.h>
#include <net/uip/uip-arch.h>
#include <net/uip/uip-arp.h>
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* The table of known address mappings */
static struct arp_entry g_arptable[CONFIG_NET_ARPTAB_SIZE];
static uint8 g_arptime;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_arp_init
*
* Description:
* Initialize the ARP module. This function must be called before any of
* the other ARP functions.
*
****************************************************************************/
void uip_arp_init(void)
{
int i;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
memset(&g_arptable[i].at_ipaddr, 0, sizeof(in_addr_t));
}
}
/****************************************************************************
* 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.
*
****************************************************************************/
void uip_arp_timer(void)
{
struct arp_entry *tabptr;
int i;
++g_arptime;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (tabptr->at_ipaddr != 0 && g_arptime - tabptr->at_time >= UIP_ARP_MAXAGE)
{
tabptr->at_ipaddr = 0;
}
}
}
/****************************************************************************
* 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[2]
* ethaddr - Refers to a HW address uint8[IFHWADDRLEN]
*
* Assumptions
* Interrupts are disabled
*
****************************************************************************/
void uip_arp_update(uint16 *pipaddr, uint8 *ethaddr)
{
struct arp_entry *tabptr = NULL;
in_addr_t ipaddr = uip_ip4addr_conv(pipaddr);
int i;
/* Walk through the ARP mapping table and try to find an entry to
* update. If none is found, the IP -> MAC address mapping is
* inserted in the ARP table.
*/
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
/* Only check those entries that are actually in use. */
if (tabptr->at_ipaddr != 0)
{
/* Check if the source IP address of the incoming packet matches
* the IP address in this ARP table entry.
*/
if (uip_ipaddr_cmp(ipaddr, tabptr->at_ipaddr))
{
/* An old entry found, update this and return. */
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
return;
}
}
}
/* If we get here, no existing ARP table entry was found, so we create one. */
/* First, we try to find an unused entry in the ARP table. */
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (tabptr->at_ipaddr == 0)
{
break;
}
}
/* If no unused entry is found, we try to find the oldest entry and
* throw it away.
*/
if (i == CONFIG_NET_ARPTAB_SIZE)
{
uint8 tmpage = 0;
int j = 0;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (g_arptime - tabptr->at_time > tmpage)
{
tmpage = g_arptime - tabptr->at_time;
j = i;
}
}
i = j;
tabptr = &g_arptable[i];
}
/* Now, i is the ARP table entry which we will fill with the new
* information.
*/
tabptr->at_ipaddr = ipaddr;
memcpy(tabptr->at_ethaddr.ether_addr_octet, ethaddr, ETHER_ADDR_LEN);
tabptr->at_time = g_arptime;
}
/****************************************************************************
* Name: uip_arp_find
*
* Description:
* Find the ARP entry corresponding to this IP address.
*
* Input parameters:
* ipaddr - Refers to an IP addressin network order
*
* Assumptions
* Interrupts are disabled; Returned value will become unstable when
* interrupts are re-enabled or if any other uIP APIs are called.
*
****************************************************************************/
struct arp_entry *uip_arp_find(in_addr_t ipaddr)
{
struct arp_entry *tabptr;
int i;
for (i = 0; i < CONFIG_NET_ARPTAB_SIZE; ++i)
{
tabptr = &g_arptable[i];
if (uip_ipaddr_cmp(ipaddr, tabptr->at_ipaddr))
{
return tabptr;
}
}
return NULL;
}
#endif /* CONFIG_NET */