Andrew Boyson / net

A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.

Dependents:   oldheating gps motorhome heating

ip6/icmp/ndp/rs.cpp@46:40d33e9037e4, 2017-10-24 (annotated)

Committer:
andrewboyson
Date:
Tue Oct 24 07:01:35 2017 +0000
Revision:
46:40d33e9037e4
Child:
47:73af5c0b0dc2
Tidied up the RA module

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 46:40d33e9037e4 1 #include "mbed.h"
andrewboyson 46:40d33e9037e4 2 #include "log.h"
andrewboyson 46:40d33e9037e4 3 #include "net.h"
andrewboyson 46:40d33e9037e4 4 #include "ndp.h"
andrewboyson 46:40d33e9037e4 5 #include "ip6.h"
andrewboyson 46:40d33e9037e4 6 #include "slaac.h"
andrewboyson 46:40d33e9037e4 7 #include "clock.h"
andrewboyson 46:40d33e9037e4 8 #include "action.h"
andrewboyson 46:40d33e9037e4 9 #include "mac.h"
andrewboyson 46:40d33e9037e4 10
andrewboyson 46:40d33e9037e4 11 bool RsTrace = false;
andrewboyson 46:40d33e9037e4 12
andrewboyson 46:40d33e9037e4 13 bool go = false;
andrewboyson 46:40d33e9037e4 14
andrewboyson 46:40d33e9037e4 15 #define REPEAT_DELAY_TIME 60
andrewboyson 46:40d33e9037e4 16 static uint32_t delayTime = 10000000; //Reset whenever a message is sent and blocks another send until count exceeds REPEAT_DELAY_TIME
andrewboyson 46:40d33e9037e4 17
andrewboyson 46:40d33e9037e4 18 int RsGetWaitingSolicitation(void* pPacket, int* pSize, uint8_t* pType, uint8_t* pCode)
andrewboyson 46:40d33e9037e4 19 {
andrewboyson 46:40d33e9037e4 20 if (!go) return DO_NOTHING;
andrewboyson 46:40d33e9037e4 21 go = false;
andrewboyson 46:40d33e9037e4 22
andrewboyson 46:40d33e9037e4 23 __packed struct header
andrewboyson 46:40d33e9037e4 24 {
andrewboyson 46:40d33e9037e4 25 uint32_t reserved;
andrewboyson 46:40d33e9037e4 26 };
andrewboyson 46:40d33e9037e4 27 struct header* pHeader = (header*)pPacket;
andrewboyson 46:40d33e9037e4 28 pHeader->reserved = 0;
andrewboyson 46:40d33e9037e4 29 *pSize = sizeof(struct header);
andrewboyson 46:40d33e9037e4 30 *pType = 133; //Router solicitation
andrewboyson 46:40d33e9037e4 31 *pCode = 0;
andrewboyson 46:40d33e9037e4 32
andrewboyson 46:40d33e9037e4 33 char* pData = (char*)pHeader + sizeof(struct header);
andrewboyson 46:40d33e9037e4 34 char* p = pData;
andrewboyson 46:40d33e9037e4 35
andrewboyson 46:40d33e9037e4 36 p += NdpAddOptionSourceMac(p, MacLocal);
andrewboyson 46:40d33e9037e4 37
andrewboyson 46:40d33e9037e4 38 *pSize = sizeof(struct header) + p - pData;
andrewboyson 46:40d33e9037e4 39
andrewboyson 46:40d33e9037e4 40 if (RsTrace)
andrewboyson 46:40d33e9037e4 41 {
andrewboyson 46:40d33e9037e4 42 if (NetTraceNewLine) Log("\r\n");
andrewboyson 46:40d33e9037e4 43 LogTime("NDP send router solicit\r\n");
andrewboyson 46:40d33e9037e4 44 if (NetTraceVerbose)
andrewboyson 46:40d33e9037e4 45 {
andrewboyson 46:40d33e9037e4 46 Log("RS header\r\n");
andrewboyson 46:40d33e9037e4 47 NdpLogOptions(pData, *pSize);
andrewboyson 46:40d33e9037e4 48 }
andrewboyson 46:40d33e9037e4 49 else
andrewboyson 46:40d33e9037e4 50 {
andrewboyson 46:40d33e9037e4 51 Log("RS header\r\n");
andrewboyson 46:40d33e9037e4 52 }
andrewboyson 46:40d33e9037e4 53 }
andrewboyson 46:40d33e9037e4 54
andrewboyson 46:40d33e9037e4 55 return ActionMakeFromDestAndTrace(MULTICAST_ROUTER, RsTrace && NetTraceStack);
andrewboyson 46:40d33e9037e4 56
andrewboyson 46:40d33e9037e4 57 }
andrewboyson 46:40d33e9037e4 58
andrewboyson 46:40d33e9037e4 59 static void checkIfGo()
andrewboyson 46:40d33e9037e4 60 {
andrewboyson 46:40d33e9037e4 61 if (delayTime < REPEAT_DELAY_TIME) return; //Don't retry within the delay time
andrewboyson 46:40d33e9037e4 62
andrewboyson 46:40d33e9037e4 63 if (NdpLifetime && NdpElapsedTime < (NdpLifetime >> 1)) return; //Do nothing if within half the life
andrewboyson 46:40d33e9037e4 64
andrewboyson 46:40d33e9037e4 65 if (!NdpLifetime || NdpElapsedTime >= NdpLifetime)
andrewboyson 46:40d33e9037e4 66 {
andrewboyson 46:40d33e9037e4 67 if (RsTrace)
andrewboyson 46:40d33e9037e4 68 {
andrewboyson 46:40d33e9037e4 69 if (NetTraceNewLine) Log("\r\n");
andrewboyson 46:40d33e9037e4 70 LogTime("NDP lifetime has expired: clear global prefix\r\n");
andrewboyson 46:40d33e9037e4 71 }
andrewboyson 46:40d33e9037e4 72 NdpLifetime = 0;
andrewboyson 46:40d33e9037e4 73 Ip6Clear(NdpPrefix);
andrewboyson 46:40d33e9037e4 74 SlaacMakeGlobal(NdpPrefix);
andrewboyson 46:40d33e9037e4 75 Ip6Clear(NdpDnsServer);
andrewboyson 46:40d33e9037e4 76 }
andrewboyson 46:40d33e9037e4 77
andrewboyson 46:40d33e9037e4 78 delayTime = 0;
andrewboyson 46:40d33e9037e4 79 go = true;
andrewboyson 46:40d33e9037e4 80 }
andrewboyson 46:40d33e9037e4 81
andrewboyson 46:40d33e9037e4 82 void RsMain()
andrewboyson 46:40d33e9037e4 83 {
andrewboyson 46:40d33e9037e4 84 if (ClockTicked)
andrewboyson 46:40d33e9037e4 85 {
andrewboyson 46:40d33e9037e4 86 NdpElapsedTime++;
andrewboyson 46:40d33e9037e4 87 delayTime++;
andrewboyson 46:40d33e9037e4 88 }
andrewboyson 46:40d33e9037e4 89 checkIfGo();
andrewboyson 46:40d33e9037e4 90 }