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/ar4.c@71:736a5747ade1, 2018-10-20 (annotated)

Committer:
andrewboyson
Date:
Sat Oct 20 18:56:13 2018 +0000
Revision:
71:736a5747ade1
Parent:
66:18a10c0b6d93
Child:
74:c3756bfa960e
Started process of making TCP pollable

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 60:1d8c7a1e7483 3 #include "log.h"
andrewboyson 66:18a10c0b6d93 4 #include "clock.h"
andrewboyson 60:1d8c7a1e7483 5 #include "net.h"
andrewboyson 60:1d8c7a1e7483 6 #include "mac.h"
andrewboyson 60:1d8c7a1e7483 7 #include "ip4addr.h"
andrewboyson 60:1d8c7a1e7483 8 #include "arp.h"
andrewboyson 60:1d8c7a1e7483 9 #include "http.h"
andrewboyson 60:1d8c7a1e7483 10
andrewboyson 60:1d8c7a1e7483 11 bool Ar4Trace = false;
andrewboyson 60:1d8c7a1e7483 12
andrewboyson 60:1d8c7a1e7483 13 #define CACHE_TIMEOUT 3600
andrewboyson 60:1d8c7a1e7483 14 #define FREEZE_TIMEOUT 1800
andrewboyson 60:1d8c7a1e7483 15 #define REPLY_TIMEOUT 2
andrewboyson 60:1d8c7a1e7483 16 #define SEND_ATTEMPTS 3
andrewboyson 60:1d8c7a1e7483 17 #define RECORDS_COUNT 20
andrewboyson 60:1d8c7a1e7483 18
andrewboyson 60:1d8c7a1e7483 19 #define STATE_EMPTY 0
andrewboyson 60:1d8c7a1e7483 20 #define STATE_WANT 1
andrewboyson 60:1d8c7a1e7483 21 #define STATE_SENT 2
andrewboyson 60:1d8c7a1e7483 22 #define STATE_VALID 3
andrewboyson 60:1d8c7a1e7483 23
andrewboyson 60:1d8c7a1e7483 24 static uint32_t elapsed = 0;
andrewboyson 60:1d8c7a1e7483 25 struct record
andrewboyson 60:1d8c7a1e7483 26 {
andrewboyson 60:1d8c7a1e7483 27 uint32_t elapsed;
andrewboyson 60:1d8c7a1e7483 28 uint32_t ip;
andrewboyson 60:1d8c7a1e7483 29 uint8_t state;
andrewboyson 60:1d8c7a1e7483 30 uint8_t tries;
andrewboyson 60:1d8c7a1e7483 31 char mac[6];
andrewboyson 60:1d8c7a1e7483 32 };
andrewboyson 60:1d8c7a1e7483 33 static struct record records[RECORDS_COUNT];
andrewboyson 60:1d8c7a1e7483 34 static int getExistingIp(uint32_t ip)
andrewboyson 60:1d8c7a1e7483 35 {
andrewboyson 60:1d8c7a1e7483 36 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 37 {
andrewboyson 60:1d8c7a1e7483 38 if (records[i].state && records[i].ip == ip) return i;
andrewboyson 60:1d8c7a1e7483 39 }
andrewboyson 60:1d8c7a1e7483 40 return -1;
andrewboyson 60:1d8c7a1e7483 41 }
andrewboyson 60:1d8c7a1e7483 42 static int getOldest()
andrewboyson 60:1d8c7a1e7483 43 {
andrewboyson 60:1d8c7a1e7483 44 int iN = 0;
andrewboyson 60:1d8c7a1e7483 45 uint32_t tN = 0xFFFFFFFF;
andrewboyson 60:1d8c7a1e7483 46 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 47 {
andrewboyson 60:1d8c7a1e7483 48 if (!records[i].state) return i; //Found an empty slot so just return it
andrewboyson 60:1d8c7a1e7483 49 if (records[i].elapsed < tN)
andrewboyson 60:1d8c7a1e7483 50 {
andrewboyson 60:1d8c7a1e7483 51 tN = records[i].elapsed;
andrewboyson 60:1d8c7a1e7483 52 iN = i;
andrewboyson 60:1d8c7a1e7483 53 }
andrewboyson 60:1d8c7a1e7483 54 }
andrewboyson 60:1d8c7a1e7483 55 return iN; //Otherwise return the oldest
andrewboyson 60:1d8c7a1e7483 56 }
andrewboyson 60:1d8c7a1e7483 57 void Ar4MakeRequestForMacFromIp(uint32_t ip)
andrewboyson 60:1d8c7a1e7483 58 {
andrewboyson 60:1d8c7a1e7483 59 //Don't treat non ips
andrewboyson 60:1d8c7a1e7483 60 if (!ip) return;
andrewboyson 60:1d8c7a1e7483 61 int i;
andrewboyson 60:1d8c7a1e7483 62
andrewboyson 60:1d8c7a1e7483 63 //If a record already exists then request an update
andrewboyson 60:1d8c7a1e7483 64 i = getExistingIp(ip);
andrewboyson 60:1d8c7a1e7483 65 if (i > -1)
andrewboyson 60:1d8c7a1e7483 66 {
andrewboyson 60:1d8c7a1e7483 67 if (elapsed < records[i].elapsed + FREEZE_TIMEOUT) return;
andrewboyson 60:1d8c7a1e7483 68 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 69 {
andrewboyson 60:1d8c7a1e7483 70 LogTimeF("AR4 Updated request for MAC of ");
andrewboyson 60:1d8c7a1e7483 71 Ip4AddressLog(ip);
andrewboyson 60:1d8c7a1e7483 72 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 73 }
andrewboyson 60:1d8c7a1e7483 74 records[i].state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 75 records[i].tries = 0;
andrewboyson 60:1d8c7a1e7483 76 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 77 return;
andrewboyson 60:1d8c7a1e7483 78 }
andrewboyson 60:1d8c7a1e7483 79
andrewboyson 60:1d8c7a1e7483 80 //If a record does not exist then find the first empty slot and add the IP and date
andrewboyson 60:1d8c7a1e7483 81 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 82 {
andrewboyson 60:1d8c7a1e7483 83 LogTimeF("AR4 Made request for MAC of ");
andrewboyson 60:1d8c7a1e7483 84 Ip4AddressLog(ip);
andrewboyson 60:1d8c7a1e7483 85 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 86 }
andrewboyson 60:1d8c7a1e7483 87 i = getOldest();
andrewboyson 60:1d8c7a1e7483 88 records[i].ip = ip;
andrewboyson 60:1d8c7a1e7483 89 records[i].state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 90 records[i].tries = 0;
andrewboyson 60:1d8c7a1e7483 91 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 92 MacClear(records[i].mac);
andrewboyson 60:1d8c7a1e7483 93 }
andrewboyson 71:736a5747ade1 94 uint32_t* Ar4AddIpRecord(void (*traceback)(void), char* mac, uint32_t ip)
andrewboyson 60:1d8c7a1e7483 95 {
andrewboyson 60:1d8c7a1e7483 96 //Don't treat non ips
andrewboyson 60:1d8c7a1e7483 97 if (!ip)
andrewboyson 60:1d8c7a1e7483 98 {
andrewboyson 60:1d8c7a1e7483 99 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 100 {
andrewboyson 60:1d8c7a1e7483 101 LogTime("Ar4AddIpRecord had blank ip\r\n");
andrewboyson 60:1d8c7a1e7483 102 if (NetTraceStack) traceback();
andrewboyson 60:1d8c7a1e7483 103 }
andrewboyson 71:736a5747ade1 104 return NULL;
andrewboyson 60:1d8c7a1e7483 105 }
andrewboyson 60:1d8c7a1e7483 106 if (MacIsEmpty(mac))
andrewboyson 60:1d8c7a1e7483 107 {
andrewboyson 60:1d8c7a1e7483 108 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 109 {
andrewboyson 60:1d8c7a1e7483 110 LogTime("Ar4AddIpRecord had blank mac\r\n");
andrewboyson 60:1d8c7a1e7483 111 if (NetTraceStack) traceback();
andrewboyson 60:1d8c7a1e7483 112 }
andrewboyson 71:736a5747ade1 113 return NULL;
andrewboyson 60:1d8c7a1e7483 114 }
andrewboyson 60:1d8c7a1e7483 115 int i;
andrewboyson 60:1d8c7a1e7483 116
andrewboyson 60:1d8c7a1e7483 117 //See if any record corresponds to the IP and, if so, update the MAC and time
andrewboyson 60:1d8c7a1e7483 118 i = getExistingIp(ip);
andrewboyson 60:1d8c7a1e7483 119 if (i > -1)
andrewboyson 60:1d8c7a1e7483 120 {
andrewboyson 60:1d8c7a1e7483 121 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 122 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 123 MacCopy(records[i].mac, mac);
andrewboyson 71:736a5747ade1 124 return &records[i].ip;
andrewboyson 60:1d8c7a1e7483 125 }
andrewboyson 60:1d8c7a1e7483 126
andrewboyson 60:1d8c7a1e7483 127 //Otherwise find the first empty slot and add the IP, MAC, and date
andrewboyson 60:1d8c7a1e7483 128 i = getOldest();
andrewboyson 60:1d8c7a1e7483 129 records[i].ip = ip;
andrewboyson 60:1d8c7a1e7483 130 records[i].elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 131 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 132 MacCopy(records[i].mac, mac);
andrewboyson 71:736a5747ade1 133 return &records[i].ip;
andrewboyson 60:1d8c7a1e7483 134 }
andrewboyson 60:1d8c7a1e7483 135 void Ar4IpToMac(uint32_t ip, char* mac)
andrewboyson 60:1d8c7a1e7483 136 {
andrewboyson 60:1d8c7a1e7483 137 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 138 {
andrewboyson 60:1d8c7a1e7483 139 if (records[i].state == STATE_VALID && records[i].ip == ip)
andrewboyson 60:1d8c7a1e7483 140 {
andrewboyson 60:1d8c7a1e7483 141 MacCopy(mac, records[i].mac);
andrewboyson 60:1d8c7a1e7483 142 return;
andrewboyson 60:1d8c7a1e7483 143 }
andrewboyson 60:1d8c7a1e7483 144 }
andrewboyson 60:1d8c7a1e7483 145 MacClear(mac);
andrewboyson 60:1d8c7a1e7483 146 }
andrewboyson 60:1d8c7a1e7483 147 void Ar4SendHttp()
andrewboyson 60:1d8c7a1e7483 148 {
andrewboyson 60:1d8c7a1e7483 149 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 150 {
andrewboyson 60:1d8c7a1e7483 151 if (records[i].state)
andrewboyson 60:1d8c7a1e7483 152 {
andrewboyson 60:1d8c7a1e7483 153 HttpAddF("%4u ", (elapsed - records[i].elapsed) / 60);
andrewboyson 60:1d8c7a1e7483 154
andrewboyson 60:1d8c7a1e7483 155 int ipLen = Ip4AddressHttp(records[i].ip);
andrewboyson 60:1d8c7a1e7483 156 HttpFillChar(' ', 40 - ipLen);
andrewboyson 60:1d8c7a1e7483 157
andrewboyson 60:1d8c7a1e7483 158 MacHttp(records[i].mac);
andrewboyson 60:1d8c7a1e7483 159
andrewboyson 60:1d8c7a1e7483 160 HttpAddChar('\r');
andrewboyson 60:1d8c7a1e7483 161 HttpAddChar('\n');
andrewboyson 60:1d8c7a1e7483 162 }
andrewboyson 60:1d8c7a1e7483 163 }
andrewboyson 60:1d8c7a1e7483 164 }
andrewboyson 60:1d8c7a1e7483 165 static void clear(struct record* pr)
andrewboyson 60:1d8c7a1e7483 166 {
andrewboyson 60:1d8c7a1e7483 167 pr->state = STATE_EMPTY;
andrewboyson 60:1d8c7a1e7483 168 }
andrewboyson 60:1d8c7a1e7483 169 static void clearCache(struct record* pr)
andrewboyson 60:1d8c7a1e7483 170 {
andrewboyson 60:1d8c7a1e7483 171 if (elapsed > pr->elapsed + CACHE_TIMEOUT) clear(pr);
andrewboyson 60:1d8c7a1e7483 172 }
andrewboyson 60:1d8c7a1e7483 173 static void retry(struct record* pr)
andrewboyson 60:1d8c7a1e7483 174 {
andrewboyson 60:1d8c7a1e7483 175 if (pr->state == STATE_SENT && elapsed > pr->elapsed + REPLY_TIMEOUT)
andrewboyson 60:1d8c7a1e7483 176 {
andrewboyson 60:1d8c7a1e7483 177 if (pr->tries < SEND_ATTEMPTS)
andrewboyson 60:1d8c7a1e7483 178 {
andrewboyson 60:1d8c7a1e7483 179 pr->state = STATE_WANT;
andrewboyson 60:1d8c7a1e7483 180 pr->elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 181 pr->tries++;
andrewboyson 60:1d8c7a1e7483 182 }
andrewboyson 60:1d8c7a1e7483 183 else
andrewboyson 60:1d8c7a1e7483 184 {
andrewboyson 60:1d8c7a1e7483 185 clear(pr);
andrewboyson 60:1d8c7a1e7483 186 }
andrewboyson 60:1d8c7a1e7483 187 }
andrewboyson 60:1d8c7a1e7483 188 }
andrewboyson 60:1d8c7a1e7483 189 static void sendRequest(struct record* pr)
andrewboyson 60:1d8c7a1e7483 190 {
andrewboyson 60:1d8c7a1e7483 191 if (!ArpResolveRequestFlag)
andrewboyson 60:1d8c7a1e7483 192 {
andrewboyson 60:1d8c7a1e7483 193 if (pr->state == STATE_WANT)
andrewboyson 60:1d8c7a1e7483 194 {
andrewboyson 60:1d8c7a1e7483 195 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 196 {
andrewboyson 60:1d8c7a1e7483 197 LogTimeF("AR4 Send request for MAC from IP4 ");
andrewboyson 60:1d8c7a1e7483 198 Ip4AddressLog(pr->ip);
andrewboyson 60:1d8c7a1e7483 199 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 200 }
andrewboyson 60:1d8c7a1e7483 201 ArpAddressToResolve = pr->ip;
andrewboyson 60:1d8c7a1e7483 202 ArpResolveRequestFlag = true;
andrewboyson 60:1d8c7a1e7483 203 pr->state = STATE_SENT;
andrewboyson 60:1d8c7a1e7483 204 pr->elapsed = elapsed;
andrewboyson 60:1d8c7a1e7483 205 return;
andrewboyson 60:1d8c7a1e7483 206 }
andrewboyson 60:1d8c7a1e7483 207 }
andrewboyson 60:1d8c7a1e7483 208 }
andrewboyson 60:1d8c7a1e7483 209 void Ar4Main()
andrewboyson 60:1d8c7a1e7483 210 {
andrewboyson 60:1d8c7a1e7483 211 static int i = -1;
andrewboyson 60:1d8c7a1e7483 212 i++;
andrewboyson 60:1d8c7a1e7483 213 if (i >= RECORDS_COUNT) i = 0;
andrewboyson 60:1d8c7a1e7483 214
andrewboyson 60:1d8c7a1e7483 215 struct record* pr = &records[i];
andrewboyson 60:1d8c7a1e7483 216
andrewboyson 60:1d8c7a1e7483 217 clearCache (pr);
andrewboyson 60:1d8c7a1e7483 218 retry (pr);
andrewboyson 60:1d8c7a1e7483 219 sendRequest(pr);
andrewboyson 60:1d8c7a1e7483 220
andrewboyson 66:18a10c0b6d93 221 if (ClockTicked) elapsed++;
andrewboyson 60:1d8c7a1e7483 222 }
andrewboyson 60:1d8c7a1e7483 223 void Ar4Init()
andrewboyson 60:1d8c7a1e7483 224 {
andrewboyson 60:1d8c7a1e7483 225 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 226 {
andrewboyson 60:1d8c7a1e7483 227 struct record* pr = &records[i];
andrewboyson 60:1d8c7a1e7483 228 clear(pr);
andrewboyson 60:1d8c7a1e7483 229 }
andrewboyson 60:1d8c7a1e7483 230 }