Diff: libs/Network/uip/uip/uip_arp.c

Revision:

3:f151d08d335c

Parent:

2:1df0b61d3b5a

--- a/libs/Network/uip/uip/uip_arp.c	Fri Feb 28 18:52:52 2014 -0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,428 +0,0 @@
-#pragma GCC diagnostic ignored "-Wredundant-decls"
-#pragma GCC diagnostic ignored "-Wstrict-aliasing"
-#pragma GCC diagnostic ignored "-Wcast-align"
-#pragma GCC diagnostic ignored "-Wcast-qual"
-
-/**
- * \addtogroup uip
- * @{
- */
-
-/**
- * \defgroup uiparp uIP Address Resolution Protocol
- * @{
- *
- * 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.
- */
-
-/**
- * \file
- * Implementation of the ARP Address Resolution Protocol.
- * \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.
- *
- * This file is part of the uIP TCP/IP stack.
- *
- * $Id: uip_arp.c,v 1.8 2006/06/02 23:36:21 adam Exp $
- *
- */
-
-
-#include "uip_arp.h"
-
-#include <string.h>
-
-struct arp_hdr {
-  struct uip_eth_hdr ethhdr;
-  u16_t hwtype;
-  u16_t protocol;
-  u8_t hwlen;
-  u8_t protolen;
-  u16_t opcode;
-  struct uip_eth_addr shwaddr;
-  u16_t sipaddr[2];
-  struct uip_eth_addr dhwaddr;
-  u16_t dipaddr[2];
-};
-
-struct ethip_hdr {
-  struct uip_eth_hdr ethhdr;
-  /* IP header. */
-  u8_t vhl,
-    tos,
-    len[2],
-    ipid[2],
-    ipoffset[2],
-    ttl,
-    proto;
-  u16_t ipchksum;
-  u16_t srcipaddr[2],
-    destipaddr[2];
-};
-
-#define ARP_REQUEST 1
-#define ARP_REPLY   2
-
-#define ARP_HWTYPE_ETH 1
-
-struct arp_entry {
-  u16_t ipaddr[2];
-  struct uip_eth_addr ethaddr;
-  u8_t time;
-};
-
-static const struct uip_eth_addr broadcast_ethaddr =
-  {{0xff,0xff,0xff,0xff,0xff,0xff}};
-static const u16_t broadcast_ipaddr[2] = {0xffff,0xffff};
-
-static struct arp_entry arp_table[UIP_ARPTAB_SIZE]  __attribute__ ((section ("AHBSRAM1")));
-static u16_t ipaddr[2];
-static u8_t i, c;
-
-static u8_t arptime;
-static u8_t tmpage;
-
-#define BUF   ((struct arp_hdr *)&uip_buf[0])
-#define IPBUF ((struct ethip_hdr *)&uip_buf[0])
-/*-----------------------------------------------------------------------------------*/
-/**
- * Initialize the ARP module.
- *
- */
-/*-----------------------------------------------------------------------------------*/
-void
-uip_arp_init(void)
-{
-  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
-    memset(arp_table[i].ipaddr, 0, 4);
-  }
-}
-/*-----------------------------------------------------------------------------------*/
-/**
- * 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;
-
-  ++arptime;
-  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
-    tabptr = &arp_table[i];
-    if((tabptr->ipaddr[0] | tabptr->ipaddr[1]) != 0 &&
-       arptime - tabptr->time >= UIP_ARP_MAXAGE) {
-      memset(tabptr->ipaddr, 0, 4);
-    }
-  }
-
-}
-/*-----------------------------------------------------------------------------------*/
-static void
-uip_arp_update(u16_t *ipaddr, struct uip_eth_addr *ethaddr)
-{
-  register struct arp_entry *tabptr;
-  /* 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 < UIP_ARPTAB_SIZE; ++i) {
-
-    tabptr = &arp_table[i];
-    /* Only check those entries that are actually in use. */
-    if(tabptr->ipaddr[0] != 0 &&
-       tabptr->ipaddr[1] != 0) {
-
-      /* Check if the source IP address of the incoming packet matches
-         the IP address in this ARP table entry. */
-      if(ipaddr[0] == tabptr->ipaddr[0] &&
-	 ipaddr[1] == tabptr->ipaddr[1]) {
-
-	/* An old entry found, update this and return. */
-	memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
-	tabptr->time = 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 < UIP_ARPTAB_SIZE; ++i) {
-    tabptr = &arp_table[i];
-    if(tabptr->ipaddr[0] == 0 &&
-       tabptr->ipaddr[1] == 0) {
-      break;
-    }
-  }
-
-  /* If no unused entry is found, we try to find the oldest entry and
-     throw it away. */
-  if(i == UIP_ARPTAB_SIZE) {
-    tmpage = 0;
-    c = 0;
-    for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
-      tabptr = &arp_table[i];
-      if(arptime - tabptr->time > tmpage) {
-	tmpage = arptime - tabptr->time;
-	c = i;
-      }
-    }
-    i = c;
-    tabptr = &arp_table[i];
-  }
-
-  /* Now, i is the ARP table entry which we will fill with the new
-     information. */
-  memcpy(tabptr->ipaddr, ipaddr, 4);
-  memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
-  tabptr->time = arptime;
-}
-/*-----------------------------------------------------------------------------------*/
-/**
- * ARP processing for incoming IP packets
- *
- * This function should be called by the device driver when an IP
- * packet has been received. The function will check if the address is
- * in the ARP cache, and if so the ARP cache entry will be
- * refreshed. If no ARP cache entry was found, a new one is created.
- *
- * This function expects an IP packet with a prepended Ethernet header
- * in the uip_buf[] buffer, and the length of the packet in the global
- * variable uip_len.
- */
-/*-----------------------------------------------------------------------------------*/
-#if 0
-void
-uip_arp_ipin(void)
-{
-  uip_len -= sizeof(struct uip_eth_hdr);
-
-  /* Only insert/update an entry if the source IP address of the
-     incoming IP packet comes from a host on the local network. */
-  if((IPBUF->srcipaddr[0] & uip_netmask[0]) !=
-     (uip_hostaddr[0] & uip_netmask[0])) {
-    return;
-  }
-  if((IPBUF->srcipaddr[1] & uip_netmask[1]) !=
-     (uip_hostaddr[1] & uip_netmask[1])) {
-    return;
-  }
-  uip_arp_update(IPBUF->srcipaddr, &(IPBUF->ethhdr.src));
-
-  return;
-}
-#endif /* 0 */
-/*-----------------------------------------------------------------------------------*/
-/**
- * ARP processing for incoming ARP packets.
- *
- * This function should be called by the device driver when an ARP
- * packet has been received. The function will act differently
- * depending on the ARP packet type: if it is a reply for a request
- * that we previously sent out, the ARP cache will be filled in with
- * the values from the ARP reply. If the incoming ARP packet is an ARP
- * request for our IP address, an ARP reply packet is created and put
- * into the uip_buf[] buffer.
- *
- * When the function returns, the value of the global variable uip_len
- * indicates whether the device driver should send out a packet or
- * not. If uip_len is zero, no packet should be sent. If uip_len is
- * non-zero, it contains the length of the outbound packet that is
- * present in the uip_buf[] buffer.
- *
- * This function expects an ARP packet with a prepended Ethernet
- * header in the uip_buf[] buffer, and the length of the packet in the
- * global variable uip_len.
- */
-/*-----------------------------------------------------------------------------------*/
-void
-uip_arp_arpin(void)
-{
-
-  if(uip_len < sizeof(struct arp_hdr)) {
-    uip_len = 0;
-    return;
-  }
-  uip_len = 0;
-
-  switch(BUF->opcode) {
-  case HTONS(ARP_REQUEST):
-    /* ARP request. If it asked for our address, we send out a
-       reply. */
-    if(uip_ipaddr_cmp(BUF->dipaddr, uip_hostaddr)) {
-      /* First, we register the one who made the request in our ARP
-	 table, since it is likely that we will do more communication
-	 with this host in the future. */
-      uip_arp_update(BUF->sipaddr, &BUF->shwaddr);
-
-      /* The reply opcode is 2. */
-      BUF->opcode = HTONS(2);
-
-      memcpy(BUF->dhwaddr.addr, BUF->shwaddr.addr, 6);
-      memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
-      memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
-      memcpy(BUF->ethhdr.dest.addr, BUF->dhwaddr.addr, 6);
-
-      BUF->dipaddr[0] = BUF->sipaddr[0];
-      BUF->dipaddr[1] = BUF->sipaddr[1];
-      BUF->sipaddr[0] = uip_hostaddr[0];
-      BUF->sipaddr[1] = uip_hostaddr[1];
-
-      BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
-      uip_len = sizeof(struct arp_hdr);
-    }
-    break;
-  case HTONS(ARP_REPLY):
-    /* ARP reply. We insert or update the ARP table if it was meant
-       for us. */
-    if(uip_ipaddr_cmp(BUF->dipaddr, uip_hostaddr)) {
-      uip_arp_update(BUF->sipaddr, &BUF->shwaddr);
-    }
-    break;
-  }
-
-  return;
-}
-/*-----------------------------------------------------------------------------------*/
-/**
- * Prepend Ethernet header to an outbound IP packet and see if we need
- * to send out an ARP request.
- *
- * This function should be called before sending out an IP packet. The
- * function checks the destination IP address of the IP packet to see
- * what Ethernet MAC address that should be used as a destination MAC
- * address on the Ethernet.
- *
- * If the destination IP address is in the local network (determined
- * by logical ANDing of netmask and our IP address), the function
- * checks the ARP cache to see if an entry for the destination IP
- * address is found. If so, an Ethernet header is prepended and the
- * function returns. If no ARP cache entry is found for the
- * destination IP address, the packet in the uip_buf[] is replaced by
- * an ARP request packet for the IP address. The IP packet is dropped
- * and it is assumed that they higher level protocols (e.g., TCP)
- * eventually will retransmit the dropped packet.
- *
- * If the destination IP address is not on the local network, the IP
- * address of the default router is used instead.
- *
- * When the function returns, a packet is present in the uip_buf[]
- * buffer, and the length of the packet is in the global variable
- * uip_len.
- */
-/*-----------------------------------------------------------------------------------*/
-void
-uip_arp_out(void)
-{
-  struct arp_entry *tabptr;
-
-  /* Find the destination IP address in the ARP table and construct
-     the Ethernet header. If the destination IP addres isn't on the
-     local network, we use the default router's IP address instead.
-
-     If not ARP table entry is found, we overwrite the original IP
-     packet with an ARP request for the IP address. */
-
-  /* First check if destination is a local broadcast. */
-  if(uip_ipaddr_cmp(IPBUF->destipaddr, broadcast_ipaddr)) {
-    memcpy(IPBUF->ethhdr.dest.addr, broadcast_ethaddr.addr, 6);
-  } else {
-    /* Check if the destination address is on the local network. */
-    if(!uip_ipaddr_maskcmp(IPBUF->destipaddr, uip_hostaddr, uip_netmask)) {
-      /* Destination address was not on the local network, so we need to
-	 use the default router's IP address instead of the destination
-	 address when determining the MAC address. */
-      uip_ipaddr_copy(ipaddr, uip_draddr);
-    } else {
-      /* Else, we use the destination IP address. */
-      uip_ipaddr_copy(ipaddr, IPBUF->destipaddr);
-    }
-
-    for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
-      tabptr = &arp_table[i];
-      if(uip_ipaddr_cmp(ipaddr, tabptr->ipaddr)) {
-	break;
-      }
-    }
-
-    if(i == UIP_ARPTAB_SIZE) {
-      /* The destination address was not in our ARP table, so we
-	 overwrite the IP packet with an ARP request. */
-
-      memset(BUF->ethhdr.dest.addr, 0xff, 6);
-      memset(BUF->dhwaddr.addr, 0x00, 6);
-      memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
-      memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
-
-      uip_ipaddr_copy(BUF->dipaddr, ipaddr);
-      uip_ipaddr_copy(BUF->sipaddr, uip_hostaddr);
-      BUF->opcode = HTONS(ARP_REQUEST); /* ARP request. */
-      BUF->hwtype = HTONS(ARP_HWTYPE_ETH);
-      BUF->protocol = HTONS(UIP_ETHTYPE_IP);
-      BUF->hwlen = 6;
-      BUF->protolen = 4;
-      BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
-
-      uip_appdata = &uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN];
-
-      uip_len = sizeof(struct arp_hdr);
-      return;
-    }
-
-    /* Build an ethernet header. */
-    memcpy(IPBUF->ethhdr.dest.addr, tabptr->ethaddr.addr, 6);
-  }
-  memcpy(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
-
-  IPBUF->ethhdr.type = HTONS(UIP_ETHTYPE_IP);
-
-  uip_len += sizeof(struct uip_eth_hdr);
-}
-/*-----------------------------------------------------------------------------------*/
-
-/** @} */
-/** @} */