Diff: ip6/icmp/ndp/rs.cpp

Revision:

46:40d33e9037e4

Child:

47:73af5c0b0dc2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ip6/icmp/ndp/rs.cpp	Tue Oct 24 07:01:35 2017 +0000
@@ -0,0 +1,90 @@
+#include "mbed.h"
+#include "log.h"
+#include "net.h"
+#include "ndp.h"
+#include "ip6.h"
+#include "slaac.h"
+#include "clock.h"
+#include "action.h"
+#include "mac.h"
+
+bool RsTrace = false;
+
+bool go = false;
+
+#define REPEAT_DELAY_TIME 60
+static uint32_t delayTime = 10000000; //Reset whenever a message is sent and blocks another send until count exceeds REPEAT_DELAY_TIME
+
+int RsGetWaitingSolicitation(void* pPacket, int* pSize, uint8_t* pType, uint8_t* pCode)
+{
+    if (!go) return DO_NOTHING;
+    go = false;
+    
+    __packed struct header
+    {
+        uint32_t  reserved;
+    };
+    struct header* pHeader = (header*)pPacket;
+    pHeader->reserved = 0;
+    *pSize = sizeof(struct header);
+    *pType = 133; //Router solicitation
+    *pCode = 0;
+
+    char* pData = (char*)pHeader + sizeof(struct header);
+    char* p = pData;
+    
+    p += NdpAddOptionSourceMac(p, MacLocal);
+    
+    *pSize = sizeof(struct header) + p - pData;
+    
+    if (RsTrace)
+    {
+        if (NetTraceNewLine) Log("\r\n");
+        LogTime("NDP send router solicit\r\n");
+        if (NetTraceVerbose)
+        {
+            Log("RS header\r\n");
+            NdpLogOptions(pData, *pSize);
+        }
+        else
+        {
+            Log("RS    header\r\n");
+        }
+    }
+    
+    return ActionMakeFromDestAndTrace(MULTICAST_ROUTER, RsTrace && NetTraceStack);
+    
+}
+
+static void checkIfGo()
+{
+    if (delayTime < REPEAT_DELAY_TIME) return; //Don't retry within the delay time
+    
+    if (NdpLifetime && NdpElapsedTime < (NdpLifetime >> 1)) return; //Do nothing if within half the life
+    
+    if (!NdpLifetime || NdpElapsedTime >= NdpLifetime)
+    {
+        if (RsTrace)
+        {
+            if (NetTraceNewLine) Log("\r\n");
+            LogTime("NDP lifetime has expired: clear global prefix\r\n");
+        }
+        NdpLifetime = 0;
+        Ip6Clear(NdpPrefix);
+        SlaacMakeGlobal(NdpPrefix);
+        Ip6Clear(NdpDnsServer);
+    }
+    
+    delayTime = 0;
+    go = true;
+}
+
+void RsMain()
+{
+    if (ClockTicked)
+    {
+        NdpElapsedTime++;
+        delayTime++;
+    }
+    checkIfGo();
+}