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

eth/ar6.c@66:18a10c0b6d93, 2018-01-19 (annotated)

Committer:
andrewboyson
Date:
Fri Jan 19 19:47:37 2018 +0000
Revision:
66:18a10c0b6d93
Parent:
65:37acccf2752f
Child:
71:736a5747ade1
Updated following clock.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 61:aad055f1b0d1 1 #include <stdint.h>
andrewboyson 61:aad055f1b0d1 2 #include <stdbool.h>
andrewboyson 61:aad055f1b0d1 3
andrewboyson 60:1d8c7a1e7483 4 #include "log.h"
andrewboyson 66:18a10c0b6d93 5 #include "clock.h"
andrewboyson 60:1d8c7a1e7483 6 #include "net.h"
andrewboyson 60:1d8c7a1e7483 7 #include "mac.h"
andrewboyson 60:1d8c7a1e7483 8 #include "ip6addr.h"
andrewboyson 60:1d8c7a1e7483 9 #include "ns.h"
andrewboyson 60:1d8c7a1e7483 10 #include "http.h"
andrewboyson 60:1d8c7a1e7483 11
andrewboyson 60:1d8c7a1e7483 12 bool Ar6Trace = false;
andrewboyson 60:1d8c7a1e7483 13
andrewboyson 60:1d8c7a1e7483 14 #define CACHE_TIMEOUT 3600
andrewboyson 60:1d8c7a1e7483 15 #define FREEZE_TIMEOUT 1800
andrewboyson 60:1d8c7a1e7483 16 #define REPLY_TIMEOUT 2
andrewboyson 60:1d8c7a1e7483 17 #define SEND_ATTEMPTS 3
andrewboyson 60:1d8c7a1e7483 18 #define RECORDS_COUNT 20
andrewboyson 60:1d8c7a1e7483 19
andrewboyson 60:1d8c7a1e7483 20 #define STATE_EMPTY 0
andrewboyson 60:1d8c7a1e7483 21 #define STATE_WANT 1
andrewboyson 60:1d8c7a1e7483 22 #define STATE_SENT 2
andrewboyson 60:1d8c7a1e7483 23 #define STATE_VALID 3
andrewboyson 60:1d8c7a1e7483 24
andrewboyson 60:1d8c7a1e7483 25 static uint32_t elapsed = 0;
andrewboyson 60:1d8c7a1e7483 26 struct record
andrewboyson 60:1d8c7a1e7483 27 {
andrewboyson 60:1d8c7a1e7483 28 uint32_t elapsed;
andrewboyson 60:1d8c7a1e7483 29 char ip[16];
andrewboyson 60:1d8c7a1e7483 30 uint8_t state;
andrewboyson 60:1d8c7a1e7483 31 uint8_t tries;
andrewboyson 60:1d8c7a1e7483 32 char mac[6];
andrewboyson 60:1d8c7a1e7483 33 };
andrewboyson 60:1d8c7a1e7483 34 static struct record records[RECORDS_COUNT];
andrewboyson 60:1d8c7a1e7483 35 static int getExistingIp(char* ip)
andrewboyson 60:1d8c7a1e7483 36 {
andrewboyson 60:1d8c7a1e7483 37 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 38 {
andrewboyson 60:1d8c7a1e7483 39 if (records[i].state && Ip6AddressIsSame(records[i].ip, ip)) return i;
andrewboyson 60:1d8c7a1e7483 40 }
andrewboyson 60:1d8c7a1e7483 41 return -1;
andrewboyson 60:1d8c7a1e7483 42 }
andrewboyson 60:1d8c7a1e7483 43 static int getOldest()
andrewboyson 60:1d8c7a1e7483 44 {
andrewboyson 60:1d8c7a1e7483 45 int iN = 0;
andrewboyson 60:1d8c7a1e7483 46 uint32_t tN = 0xFFFFFFFF;
andrewboyson 60:1d8c7a1e7483 47 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 48 {
andrewboyson 60:1d8c7a1e7483 49 if (!records[i].state) return i; //Found an empty slot so just return it
andrewboyson 60:1d8c7a1e7483 50 if (records[i].elapsed < tN)
andrewboyson 60:1d8c7a1e7483 51 {
andrewboyson 60:1d8c7a1e7483 52 tN = records[i].elapsed;
andrewboyson 60:1d8c7a1e7483 53 iN = i;
andrewboyson 60:1d8c7a1e7483 54 }
andrewboyson 60:1d8c7a1e7483 55 }
andrewboyson 60:1d8c7a1e7483 56 return iN; //Otherwise return the oldest
andrewboyson 60:1d8c7a1e7483 57 }
andrewboyson 60:1d8c7a1e7483 58 void Ar6MakeRequestForMacFromIp(char* ip)
andrewboyson 60:1d8c7a1e7483 59 {
andrewboyson 60:1d8c7a1e7483 60 //Don't treat non ips
andrewboyson 60:1d8c7a1e7483 61 if (!ip[0]) return;
andrewboyson 60:1d8c7a1e7483 62 int i;
andrewboyson 60:1d8c7a1e7483 63
andrewboyson 60:1d8c7a1e7483 64 //If a record already exists then request an update
andrewboyson 60:1d8c7a1e7483 65 i = getExistingIp(ip);
andrewboyson 60:1d8c7a1e7483 66 if (i > -1)
andrewboyson 60:1d8c7a1e7483 67 {
andrewboyson 60:1d8c7a1e7483 68 if (elapsed < records[i].elapsed + FREEZE_TIMEOUT) return;
andrewboyson 60:1d8c7a1e7483 69 if (Ar6Trace)
andrewboyson 60:1d8c7a1e7483 70 {
andrewboyson 60:1d8c7a1e7483 71 LogTime("AR6 Updated request for MAC of ");
andrewboyson 60:1d8c7a1e7483 72 Ip6AddressLog(ip);
andrewboyson 60:1d8c7a1e7483 73 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 74 }
andrewboyson 60:1d8c7a1e7483 75 records[i].state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 76 records[i].tries = 0;
andrewboyson 60:1d8c7a1e7483 77 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 78 return;
andrewboyson 60:1d8c7a1e7483 79 }
andrewboyson 60:1d8c7a1e7483 80
andrewboyson 60:1d8c7a1e7483 81 //If a record does not exist then find the first empty slot and add the IP and date
andrewboyson 60:1d8c7a1e7483 82 if (Ar6Trace)
andrewboyson 60:1d8c7a1e7483 83 {
andrewboyson 60:1d8c7a1e7483 84 LogTime("AR6 Made request for MAC of ");
andrewboyson 60:1d8c7a1e7483 85 Ip6AddressLog(ip);
andrewboyson 60:1d8c7a1e7483 86 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 87 }
andrewboyson 60:1d8c7a1e7483 88 i = getOldest();
andrewboyson 60:1d8c7a1e7483 89 Ip6AddressCopy(records[i].ip, ip);
andrewboyson 60:1d8c7a1e7483 90 records[i].state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 91 records[i].tries = 0;
andrewboyson 60:1d8c7a1e7483 92 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 93 MacClear(records[i].mac);
andrewboyson 60:1d8c7a1e7483 94 }
andrewboyson 60:1d8c7a1e7483 95 void Ar6AddIpRecord(void (*traceback)(void), char* mac, char* ip)
andrewboyson 60:1d8c7a1e7483 96 {
andrewboyson 60:1d8c7a1e7483 97 //Don't treat non ips
andrewboyson 60:1d8c7a1e7483 98 if (!ip[0])
andrewboyson 60:1d8c7a1e7483 99 {
andrewboyson 60:1d8c7a1e7483 100 if (Ar6Trace)
andrewboyson 60:1d8c7a1e7483 101 {
andrewboyson 60:1d8c7a1e7483 102 LogTime("Ar6AddIpRecord had blank ip\r\n");
andrewboyson 60:1d8c7a1e7483 103 if (NetTraceStack) traceback();
andrewboyson 60:1d8c7a1e7483 104 }
andrewboyson 60:1d8c7a1e7483 105 return;
andrewboyson 60:1d8c7a1e7483 106 }
andrewboyson 60:1d8c7a1e7483 107 if (MacIsEmpty(mac))
andrewboyson 60:1d8c7a1e7483 108 {
andrewboyson 60:1d8c7a1e7483 109 if (Ar6Trace)
andrewboyson 60:1d8c7a1e7483 110 {
andrewboyson 60:1d8c7a1e7483 111 LogTime("Ar6AddIpRecord had blank mac\r\n");
andrewboyson 60:1d8c7a1e7483 112 if (NetTraceStack) traceback();
andrewboyson 60:1d8c7a1e7483 113 }
andrewboyson 60:1d8c7a1e7483 114 return;
andrewboyson 60:1d8c7a1e7483 115 }
andrewboyson 60:1d8c7a1e7483 116 int i;
andrewboyson 60:1d8c7a1e7483 117
andrewboyson 60:1d8c7a1e7483 118 //See if any record corresponds to the IP and, if so, update the MAC and time
andrewboyson 60:1d8c7a1e7483 119 i = getExistingIp(ip);
andrewboyson 60:1d8c7a1e7483 120 if (i > -1)
andrewboyson 60:1d8c7a1e7483 121 {
andrewboyson 60:1d8c7a1e7483 122 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 123 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 124 MacCopy(records[i].mac, mac);
andrewboyson 60:1d8c7a1e7483 125 return;
andrewboyson 60:1d8c7a1e7483 126 }
andrewboyson 60:1d8c7a1e7483 127
andrewboyson 60:1d8c7a1e7483 128 //Otherwise find the first empty slot and add the MAC, IP and date
andrewboyson 60:1d8c7a1e7483 129 i = getOldest();
andrewboyson 60:1d8c7a1e7483 130 MacCopy(records[i].mac, mac);
andrewboyson 60:1d8c7a1e7483 131 Ip6AddressCopy(records[i].ip, ip);
andrewboyson 60:1d8c7a1e7483 132 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 133 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 134 return;
andrewboyson 60:1d8c7a1e7483 135 }
andrewboyson 60:1d8c7a1e7483 136 void Ar6IpToMac(char* ip, char* mac)
andrewboyson 60:1d8c7a1e7483 137 {
andrewboyson 60:1d8c7a1e7483 138 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 139 {
andrewboyson 60:1d8c7a1e7483 140 if (records[i].state == STATE_VALID && Ip6AddressIsSame(records[i].ip, ip))
andrewboyson 60:1d8c7a1e7483 141 {
andrewboyson 60:1d8c7a1e7483 142 MacCopy(mac, records[i].mac);
andrewboyson 60:1d8c7a1e7483 143 return;
andrewboyson 60:1d8c7a1e7483 144 }
andrewboyson 60:1d8c7a1e7483 145 }
andrewboyson 60:1d8c7a1e7483 146 MacClear(mac);
andrewboyson 60:1d8c7a1e7483 147 }
andrewboyson 60:1d8c7a1e7483 148 void Ar6SendHttp()
andrewboyson 60:1d8c7a1e7483 149 {
andrewboyson 60:1d8c7a1e7483 150 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 151 {
andrewboyson 60:1d8c7a1e7483 152 if (records[i].state)
andrewboyson 60:1d8c7a1e7483 153 {
andrewboyson 60:1d8c7a1e7483 154 HttpAddF("%4u ", (elapsed - records[i].elapsed) / 60);
andrewboyson 60:1d8c7a1e7483 155
andrewboyson 60:1d8c7a1e7483 156 int ipLen = Ip6AddressHttp(records[i].ip);
andrewboyson 60:1d8c7a1e7483 157 HttpFillChar(' ', 40 - ipLen);
andrewboyson 60:1d8c7a1e7483 158
andrewboyson 60:1d8c7a1e7483 159 MacHttp(records[i].mac);
andrewboyson 60:1d8c7a1e7483 160
andrewboyson 60:1d8c7a1e7483 161 HttpAddChar('\r');
andrewboyson 60:1d8c7a1e7483 162 HttpAddChar('\n');
andrewboyson 60:1d8c7a1e7483 163 }
andrewboyson 60:1d8c7a1e7483 164 }
andrewboyson 60:1d8c7a1e7483 165 }
andrewboyson 60:1d8c7a1e7483 166 static void clear(struct record* pr)
andrewboyson 60:1d8c7a1e7483 167 {
andrewboyson 60:1d8c7a1e7483 168 pr->state = STATE_EMPTY;
andrewboyson 60:1d8c7a1e7483 169 }
andrewboyson 60:1d8c7a1e7483 170 static void clearCache(struct record* pr)
andrewboyson 60:1d8c7a1e7483 171 {
andrewboyson 60:1d8c7a1e7483 172 if (elapsed > pr->elapsed + CACHE_TIMEOUT) clear(pr);
andrewboyson 60:1d8c7a1e7483 173 }
andrewboyson 60:1d8c7a1e7483 174 static void retry(struct record* pr)
andrewboyson 60:1d8c7a1e7483 175 {
andrewboyson 60:1d8c7a1e7483 176 if (pr->state == STATE_SENT && elapsed > pr->elapsed + REPLY_TIMEOUT)
andrewboyson 60:1d8c7a1e7483 177 {
andrewboyson 60:1d8c7a1e7483 178 if (pr->tries < SEND_ATTEMPTS)
andrewboyson 60:1d8c7a1e7483 179 {
andrewboyson 60:1d8c7a1e7483 180 pr->state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 181 pr->elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 182 pr->tries++;
andrewboyson 60:1d8c7a1e7483 183 }
andrewboyson 60:1d8c7a1e7483 184 else
andrewboyson 60:1d8c7a1e7483 185 {
andrewboyson 60:1d8c7a1e7483 186 clear(pr);
andrewboyson 60:1d8c7a1e7483 187 }
andrewboyson 60:1d8c7a1e7483 188 }
andrewboyson 60:1d8c7a1e7483 189 }
andrewboyson 60:1d8c7a1e7483 190 static void sendRequest(struct record* pr)
andrewboyson 60:1d8c7a1e7483 191 {
andrewboyson 60:1d8c7a1e7483 192 if (!NsResolveRequestFlag)
andrewboyson 60:1d8c7a1e7483 193 {
andrewboyson 60:1d8c7a1e7483 194 if (pr->state == STATE_WANT)
andrewboyson 60:1d8c7a1e7483 195 {
andrewboyson 60:1d8c7a1e7483 196 if (Ar6Trace)
andrewboyson 60:1d8c7a1e7483 197 {
andrewboyson 60:1d8c7a1e7483 198 LogTime("AR6 Send request for MAC from IP6 ");
andrewboyson 60:1d8c7a1e7483 199 Ip6AddressLog(pr->ip);
andrewboyson 60:1d8c7a1e7483 200 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 201 }
andrewboyson 60:1d8c7a1e7483 202 Ip6AddressCopy(NsAddressToResolve, pr->ip);
andrewboyson 60:1d8c7a1e7483 203 NsResolveRequestFlag = true;
andrewboyson 60:1d8c7a1e7483 204 pr->state = STATE_SENT;
andrewboyson 60:1d8c7a1e7483 205 pr->elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 206 return;
andrewboyson 60:1d8c7a1e7483 207 }
andrewboyson 60:1d8c7a1e7483 208 }
andrewboyson 60:1d8c7a1e7483 209 }
andrewboyson 60:1d8c7a1e7483 210 void Ar6Main()
andrewboyson 60:1d8c7a1e7483 211 {
andrewboyson 60:1d8c7a1e7483 212 static int i = -1;
andrewboyson 60:1d8c7a1e7483 213 i++;
andrewboyson 60:1d8c7a1e7483 214 if (i >= RECORDS_COUNT) i = 0;
andrewboyson 60:1d8c7a1e7483 215
andrewboyson 60:1d8c7a1e7483 216 struct record* pr = &records[i];
andrewboyson 60:1d8c7a1e7483 217
andrewboyson 60:1d8c7a1e7483 218 clearCache (pr);
andrewboyson 60:1d8c7a1e7483 219 retry (pr);
andrewboyson 60:1d8c7a1e7483 220 sendRequest(pr);
andrewboyson 60:1d8c7a1e7483 221
andrewboyson 66:18a10c0b6d93 222 if (ClockTicked) elapsed++;
andrewboyson 60:1d8c7a1e7483 223 }
andrewboyson 60:1d8c7a1e7483 224 void Ar6Init()
andrewboyson 60:1d8c7a1e7483 225 {
andrewboyson 60:1d8c7a1e7483 226 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 227 {
andrewboyson 60:1d8c7a1e7483 228
andrewboyson 60:1d8c7a1e7483 229 struct record* pr = &records[i];
andrewboyson 60:1d8c7a1e7483 230 clear(pr);
andrewboyson 60:1d8c7a1e7483 231 }
andrewboyson 60:1d8c7a1e7483 232 }