Daniele Lacamera / PicoTCP Featured

Free (GPLv2) TCP/IP stack developed by TASS Belgium

Dependents:   lpc1768-picotcp-demo ZeroMQ_PicoTCP_Publisher_demo TCPSocket_HelloWorld_PicoTCP Pico_TCP_UDP_Test ... more

PicoTCP. Copyright (c) 2013 TASS Belgium NV.

Released under the GNU General Public License, version 2.

Different licensing models may exist, at the sole discretion of the Copyright holders.

Official homepage: http://www.picotcp.com

Bug tracker: https://github.com/tass-belgium/picotcp/issues

Development steps:

  • initial integration with mbed RTOS
  • generic mbed Ethernet driver
  • high performance NXP LPC1768 specific Ethernet driver
  • Multi-threading support for mbed RTOS
  • Berkeley sockets and integration with the New Socket API
  • Fork of the apps running on top of the New Socket API
  • Scheduling optimizations
  • Debugging/benchmarking/testing

Demo application (measuring TCP sender performance):

Import programlpc1768-picotcp-demo

A PicoTCP demo app testing the ethernet throughput on the lpc1768 mbed board.

Last commit 17 May 2013 by TASS Belgium

Diff: stack/pico_arp.c

Revision:
123:dd26752a4538
Parent:
74:c146c4e346c4
Child:
128:ae39e6e81531
--- a/stack/pico_arp.c	Thu Nov 21 09:48:05 2013 +0000
+++ b/stack/pico_arp.c	Wed Nov 27 10:20:00 2013 +0000
@@ -58,6 +58,13 @@
   struct pico_ip4 dst;
 };
 
+struct arp_service_ipconflict{
+	struct pico_eth mac;
+	struct pico_ip4 ip;
+	void (*conflict)(void);
+};
+
+static struct arp_service_ipconflict conflict_ipv4;
 
 #define PICO_SIZE_ARPHDR ((sizeof(struct pico_arp_hdr)))
 
@@ -141,9 +148,9 @@
        dbg ("================= ARP REQUIRED: %d =============\n\n", f->failure_count);
        /* check if dst is local (gateway = 0), or if to use gateway */
        if (gateway.addr != 0)
-         pico_arp_query(f->dev, &gateway);  /* arp to gateway */
+    	 pico_arp_request(f->dev, &gateway, PICO_ARP_QUERY);  /* arp to gateway */
        else
-         pico_arp_query(f->dev, &hdr->dst); /* arp to dst */
+    	 pico_arp_request(f->dev, &hdr->dst, PICO_ARP_QUERY); /* arp to dst */
 
        pico_enqueue(&pending, f);
        if (!pending_timer_on) {
@@ -178,7 +185,7 @@
   IGNORE_PARAMETER(now);
   stale->arp_status = PICO_ARP_STATUS_STALE;
   arp_dbg("ARP: Setting arp_status to STALE\n");
-  pico_arp_query(stale->dev, &stale->ipv4);
+  pico_arp_request(stale->dev, &stale->ipv4, PICO_ARP_QUERY);
 
 }
 
@@ -218,6 +225,11 @@
   if (!hdr)
     goto end;
 
+  if (conflict_ipv4.conflict != NULL)
+  {
+    if ((conflict_ipv4.ip.addr == hdr->src.addr) && (memcmp(hdr->s_mac,conflict_ipv4.mac.addr,6) != 0))
+      conflict_ipv4.conflict();
+  }
 
   /* Populate a new arp entry */
   search.ipv4.addr = hdr->src.addr;
@@ -280,7 +292,7 @@
   return ret;
 }
 
-int32_t pico_arp_query(struct pico_device *dev, struct pico_ip4 *dst)
+int32_t pico_arp_request(struct pico_device *dev, struct pico_ip4 *dst, uint8_t type)
 {
   struct pico_frame *q = pico_frame_alloc(PICO_SIZE_ETHHDR + PICO_SIZE_ARPHDR);
   struct pico_eth_hdr *eh;
@@ -288,9 +300,12 @@
   struct pico_ip4 *src;
   int ret;
 
-  src = pico_ipv4_source_find(dst);
-  if (!src)
-    return -1;
+  if (type == PICO_ARP_QUERY)
+  {
+    src = pico_ipv4_source_find(dst);
+    if (!src)
+      return -1;
+  }
 
   arp_dbg("QUERY: %08x\n", dst->addr);
 
@@ -311,9 +326,22 @@
   ah->psize  = PICO_SIZE_IP4;
   ah->opcode = PICO_ARP_REQUEST;
   memcpy(ah->s_mac, dev->eth->mac.addr, PICO_SIZE_ETH);
-  ah->src.addr = src->addr;
-  ah->dst.addr = dst->addr;
-  arp_dbg("Sending arp query.\n");
+
+  switch (type){
+  case PICO_ARP_ANNOUNCE:
+	  ah->src.addr = dst->addr;
+	  ah->dst.addr = dst->addr;
+	  break;
+  case PICO_ARP_PROBE:
+	  ah->src.addr = 0;
+	  ah->dst.addr = dst->addr;
+	  break;
+  default:
+	  ah->src.addr = src->addr;
+	  ah->dst.addr = dst->addr;
+  }
+
+  arp_dbg("Sending arp request.\n");
   ret = dev->send(dev, q->start,(int) q->len);
   pico_frame_discard(q);
   return ret;
@@ -334,3 +362,11 @@
   }
   return i;
 }
+
+void pico_arp_register_ipconflict(struct pico_ip4 *ip, struct pico_eth *mac, void(*cb)(void))
+{
+  conflict_ipv4.conflict = cb;
+  conflict_ipv4.ip.addr = ip->addr;
+  if (mac != NULL)
+    memcpy(conflict_ipv4.mac.addr, mac, 6);
+}