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@94:e2973a2c488e, 2018-12-05 (annotated)

Committer:
andrewboyson
Date:
Wed Dec 05 18:30:37 2018 +0000
Revision:
94:e2973a2c488e
Parent:
93:580fc113d9e9 
Fixed bug - incorrect MSS being sent from a polled sync: expected 1440 but had -60. Traced to buffer datalength in EthPollForPacketToSend being set to zero instead of being calculated from the buffer length - headersize.

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 60:1d8c7a1e7483 4 #include "net.h"
andrewboyson 60:1d8c7a1e7483 5 #include "mac.h"
andrewboyson 60:1d8c7a1e7483 6 #include "ip4addr.h"
andrewboyson 60:1d8c7a1e7483 7 #include "arp.h"
andrewboyson 60:1d8c7a1e7483 8 #include "http.h"
andrewboyson 93:580fc113d9e9 9 #include "mstimer.h"
andrewboyson 60:1d8c7a1e7483 10
andrewboyson 60:1d8c7a1e7483 11 bool Ar4Trace = false;
andrewboyson 60:1d8c7a1e7483 12
andrewboyson 93:580fc113d9e9 13 #define CACHE_TIMEOUT_MS 3600 * 1000
andrewboyson 93:580fc113d9e9 14 #define FREEZE_TIMEOUT_MS 1800 * 1000
andrewboyson 93:580fc113d9e9 15 #define REPLY_TIMEOUT_MS 2 * 1000
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 struct record
andrewboyson 60:1d8c7a1e7483 25 {
andrewboyson 60:1d8c7a1e7483 26 uint32_t elapsed;
andrewboyson 60:1d8c7a1e7483 27 uint32_t ip;
andrewboyson 60:1d8c7a1e7483 28 uint8_t state;
andrewboyson 60:1d8c7a1e7483 29 uint8_t tries;
andrewboyson 60:1d8c7a1e7483 30 char mac[6];
andrewboyson 60:1d8c7a1e7483 31 };
andrewboyson 60:1d8c7a1e7483 32 static struct record records[RECORDS_COUNT];
andrewboyson 60:1d8c7a1e7483 33 static int getExistingIp(uint32_t ip)
andrewboyson 60:1d8c7a1e7483 34 {
andrewboyson 60:1d8c7a1e7483 35 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 36 {
andrewboyson 60:1d8c7a1e7483 37 if (records[i].state && records[i].ip == ip) return i;
andrewboyson 60:1d8c7a1e7483 38 }
andrewboyson 60:1d8c7a1e7483 39 return -1;
andrewboyson 60:1d8c7a1e7483 40 }
andrewboyson 60:1d8c7a1e7483 41 static int getOldest()
andrewboyson 60:1d8c7a1e7483 42 {
andrewboyson 93:580fc113d9e9 43 int iOldest = 0;
andrewboyson 93:580fc113d9e9 44 uint32_t ageOldest = 0;
andrewboyson 60:1d8c7a1e7483 45 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 46 {
andrewboyson 60:1d8c7a1e7483 47 if (!records[i].state) return i; //Found an empty slot so just return it
andrewboyson 93:580fc113d9e9 48 uint32_t age = MsTimerCount - records[i].elapsed;
andrewboyson 93:580fc113d9e9 49 if (age >= ageOldest)
andrewboyson 60:1d8c7a1e7483 50 {
andrewboyson 93:580fc113d9e9 51 ageOldest = age;
andrewboyson 93:580fc113d9e9 52 iOldest = i;
andrewboyson 60:1d8c7a1e7483 53 }
andrewboyson 60:1d8c7a1e7483 54 }
andrewboyson 93:580fc113d9e9 55 return iOldest; //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 93:580fc113d9e9 67 if (!MsTimerHasElapsed(records[i].elapsed, FREEZE_TIMEOUT_MS)) 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 93:580fc113d9e9 76 records[i].elapsed = MsTimerCount;
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 93:580fc113d9e9 91 records[i].elapsed = MsTimerCount;
andrewboyson 60:1d8c7a1e7483 92 MacClear(records[i].mac);
andrewboyson 60:1d8c7a1e7483 93 }
andrewboyson 74:c3756bfa960e 94 int 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 74:c3756bfa960e 104 return -1;
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 74:c3756bfa960e 113 return -1;
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 93:580fc113d9e9 121 records[i].elapsed = MsTimerCount;
andrewboyson 93:580fc113d9e9 122 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 123 MacCopy(records[i].mac, mac);
andrewboyson 74:c3756bfa960e 124 return i;
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 93:580fc113d9e9 130 records[i].elapsed = MsTimerCount;
andrewboyson 60:1d8c7a1e7483 131 records[i].state = STATE_VALID;
andrewboyson 60:1d8c7a1e7483 132 MacCopy(records[i].mac, mac);
andrewboyson 74:c3756bfa960e 133 return i;
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 74:c3756bfa960e 147 uint32_t Ar4IndexToIp(int i)
andrewboyson 74:c3756bfa960e 148 {
andrewboyson 74:c3756bfa960e 149 return records[i].ip;
andrewboyson 74:c3756bfa960e 150 }
andrewboyson 60:1d8c7a1e7483 151 void Ar4SendHttp()
andrewboyson 60:1d8c7a1e7483 152 {
andrewboyson 60:1d8c7a1e7483 153 for (int i = 0; i < RECORDS_COUNT; i++)
andrewboyson 60:1d8c7a1e7483 154 {
andrewboyson 60:1d8c7a1e7483 155 if (records[i].state)
andrewboyson 60:1d8c7a1e7483 156 {
andrewboyson 93:580fc113d9e9 157 HttpAddF("%4u ", (MsTimerCount - records[i].elapsed) / 1000 / 60);
andrewboyson 60:1d8c7a1e7483 158
andrewboyson 60:1d8c7a1e7483 159 int ipLen = Ip4AddressHttp(records[i].ip);
andrewboyson 60:1d8c7a1e7483 160 HttpFillChar(' ', 40 - ipLen);
andrewboyson 60:1d8c7a1e7483 161
andrewboyson 60:1d8c7a1e7483 162 MacHttp(records[i].mac);
andrewboyson 60:1d8c7a1e7483 163
andrewboyson 60:1d8c7a1e7483 164 HttpAddChar('\r');
andrewboyson 60:1d8c7a1e7483 165 HttpAddChar('\n');
andrewboyson 60:1d8c7a1e7483 166 }
andrewboyson 60:1d8c7a1e7483 167 }
andrewboyson 60:1d8c7a1e7483 168 }
andrewboyson 60:1d8c7a1e7483 169 static void clear(struct record* pr)
andrewboyson 60:1d8c7a1e7483 170 {
andrewboyson 60:1d8c7a1e7483 171 pr->state = STATE_EMPTY;
andrewboyson 60:1d8c7a1e7483 172 }
andrewboyson 60:1d8c7a1e7483 173 static void clearCache(struct record* pr)
andrewboyson 60:1d8c7a1e7483 174 {
andrewboyson 93:580fc113d9e9 175 if (MsTimerHasElapsed(pr->elapsed, CACHE_TIMEOUT_MS)) clear(pr);
andrewboyson 60:1d8c7a1e7483 176 }
andrewboyson 60:1d8c7a1e7483 177 static void retry(struct record* pr)
andrewboyson 60:1d8c7a1e7483 178 {
andrewboyson 93:580fc113d9e9 179 if (pr->state == STATE_SENT && MsTimerHasElapsed(pr->elapsed, REPLY_TIMEOUT_MS))
andrewboyson 60:1d8c7a1e7483 180 {
andrewboyson 60:1d8c7a1e7483 181 if (pr->tries < SEND_ATTEMPTS)
andrewboyson 60:1d8c7a1e7483 182 {
andrewboyson 60:1d8c7a1e7483 183 pr->state = STATE_WANT;
andrewboyson 93:580fc113d9e9 184 pr->elapsed = MsTimerCount;
andrewboyson 60:1d8c7a1e7483 185 pr->tries++;
andrewboyson 60:1d8c7a1e7483 186 }
andrewboyson 60:1d8c7a1e7483 187 else
andrewboyson 60:1d8c7a1e7483 188 {
andrewboyson 60:1d8c7a1e7483 189 clear(pr);
andrewboyson 60:1d8c7a1e7483 190 }
andrewboyson 60:1d8c7a1e7483 191 }
andrewboyson 60:1d8c7a1e7483 192 }
andrewboyson 60:1d8c7a1e7483 193 static void sendRequest(struct record* pr)
andrewboyson 60:1d8c7a1e7483 194 {
andrewboyson 60:1d8c7a1e7483 195 if (!ArpResolveRequestFlag)
andrewboyson 60:1d8c7a1e7483 196 {
andrewboyson 60:1d8c7a1e7483 197 if (pr->state == STATE_WANT)
andrewboyson 60:1d8c7a1e7483 198 {
andrewboyson 60:1d8c7a1e7483 199 if (Ar4Trace)
andrewboyson 60:1d8c7a1e7483 200 {
andrewboyson 60:1d8c7a1e7483 201 LogTimeF("AR4 Send request for MAC from IP4 ");
andrewboyson 60:1d8c7a1e7483 202 Ip4AddressLog(pr->ip);
andrewboyson 60:1d8c7a1e7483 203 Log("\r\n");
andrewboyson 60:1d8c7a1e7483 204 }
andrewboyson 60:1d8c7a1e7483 205 ArpAddressToResolve = pr->ip;
andrewboyson 60:1d8c7a1e7483 206 ArpResolveRequestFlag = true;
andrewboyson 60:1d8c7a1e7483 207 pr->state = STATE_SENT;
andrewboyson 93:580fc113d9e9 208 pr->elapsed = MsTimerCount;
andrewboyson 60:1d8c7a1e7483 209 return;
andrewboyson 60:1d8c7a1e7483 210 }
andrewboyson 60:1d8c7a1e7483 211 }
andrewboyson 60:1d8c7a1e7483 212 }
andrewboyson 60:1d8c7a1e7483 213 void Ar4Main()
andrewboyson 60:1d8c7a1e7483 214 {
andrewboyson 60:1d8c7a1e7483 215 static int i = -1;
andrewboyson 60:1d8c7a1e7483 216 i++;
andrewboyson 60:1d8c7a1e7483 217 if (i >= RECORDS_COUNT) i = 0;
andrewboyson 60:1d8c7a1e7483 218
andrewboyson 60:1d8c7a1e7483 219 struct record* pr = &records[i];
andrewboyson 60:1d8c7a1e7483 220
andrewboyson 60:1d8c7a1e7483 221 clearCache (pr);
andrewboyson 60:1d8c7a1e7483 222 retry (pr);
andrewboyson 60:1d8c7a1e7483 223 sendRequest(pr);
andrewboyson 60:1d8c7a1e7483 224 }
andrewboyson 60:1d8c7a1e7483 225 void Ar4Init()
andrewboyson 60:1d8c7a1e7483 226 {
andrewboyson 60:1d8c7a1e7483 227 for (int i = 0; i < RECORDS_COUNT; i++)
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 }