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

udp/udp.c@95:b9a99049016a, 2018-12-14 (annotated)

Committer:
andrewboyson
Date:
Fri Dec 14 11:36:45 2018 +0000
Revision:
95:b9a99049016a
Parent:
83:08c983006a6e
Child:
112:f8694d0b8858
Dropped 57621 Spotify P2P messages

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 37:793b39683406 4 #include "log.h"
andrewboyson 37:793b39683406 5 #include "net.h"
andrewboyson 37:793b39683406 6 #include "action.h"
andrewboyson 37:793b39683406 7 #include "udp.h"
andrewboyson 37:793b39683406 8 #include "ntp.h"
andrewboyson 57:e0fb648acf48 9 #include "tftp.h"
andrewboyson 37:793b39683406 10 #include "dhcp.h"
andrewboyson 37:793b39683406 11 #include "dns.h"
andrewboyson 37:793b39683406 12 #include "eth.h"
andrewboyson 37:793b39683406 13 #include "ip4.h"
andrewboyson 37:793b39683406 14 #include "ip6.h"
andrewboyson 37:793b39683406 15 #include "slaac.h"
andrewboyson 37:793b39683406 16 #include "ns.h"
andrewboyson 10:f0854784e960 17
andrewboyson 52:fbc5a46b5e16 18 bool UdpTrace = true;
andrewboyson 10:f0854784e960 19
andrewboyson 10:f0854784e960 20 __packed struct header
andrewboyson 10:f0854784e960 21 {
andrewboyson 10:f0854784e960 22 uint16_t srcPort;
andrewboyson 10:f0854784e960 23 uint16_t dstPort;
andrewboyson 10:f0854784e960 24 uint16_t totalLength;
andrewboyson 10:f0854784e960 25 uint16_t checksum;
andrewboyson 10:f0854784e960 26 };
andrewboyson 37:793b39683406 27 static uint16_t srcPort;
andrewboyson 37:793b39683406 28 static uint16_t dstPort;
andrewboyson 10:f0854784e960 29 static uint16_t checksum;
andrewboyson 10:f0854784e960 30 static uint16_t totalLength;
andrewboyson 10:f0854784e960 31
andrewboyson 59:e0e556c8bd46 32 static void readHeader(void* pPacket, uint16_t size)
andrewboyson 59:e0e556c8bd46 33 {
andrewboyson 61:aad055f1b0d1 34 struct header* pHeader = (struct header*)pPacket;
andrewboyson 59:e0e556c8bd46 35
andrewboyson 59:e0e556c8bd46 36 srcPort = NetToHost16(pHeader->srcPort);
andrewboyson 59:e0e556c8bd46 37 dstPort = NetToHost16(pHeader->dstPort);
andrewboyson 59:e0e556c8bd46 38 totalLength = NetToHost16(pHeader->totalLength);
andrewboyson 59:e0e556c8bd46 39 checksum = NetToHost16(pHeader->checksum);
andrewboyson 59:e0e556c8bd46 40 }
andrewboyson 59:e0e556c8bd46 41 static int handlePort(void (*traceback)(void), int dataLengthRx, void* pDataRx, int* pPataLengthTx, void* pDataTx)
andrewboyson 10:f0854784e960 42 {
andrewboyson 37:793b39683406 43 switch (dstPort)
andrewboyson 10:f0854784e960 44 {
andrewboyson 10:f0854784e960 45 //Handle these
andrewboyson 59:e0e556c8bd46 46 case DHCP_CLIENT_PORT: return DhcpHandleResponse (traceback, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); // 68
andrewboyson 59:e0e556c8bd46 47 case NTP_PORT: return NtpHandlePacketReceived(traceback, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); // 123
andrewboyson 59:e0e556c8bd46 48 case DNS_UNICAST_CLIENT_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_UDNS, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); //53053
andrewboyson 59:e0e556c8bd46 49 case DNS_MDNS_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_MDNS, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); // 5353
andrewboyson 59:e0e556c8bd46 50 case DNS_LLMNR_CLIENT_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_LLMNR, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); //53055
andrewboyson 59:e0e556c8bd46 51 case DNS_LLMNR_SERVER_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_LLMNR, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); // 5355
andrewboyson 59:e0e556c8bd46 52 case TFTP_CLIENT_PORT: return TftpHandlePacketReceived(traceback, dataLengthRx, pDataRx, pPataLengthTx, pDataTx); //60690
andrewboyson 10:f0854784e960 53
andrewboyson 10:f0854784e960 54 //Quietly drop these
andrewboyson 42:222a4f45f916 55 case DHCP_SERVER_PORT: //67
andrewboyson 57:e0fb648acf48 56 case TFTP_SERVER_PORT: //69
andrewboyson 42:222a4f45f916 57 case 137: //NETBIOS name service
andrewboyson 42:222a4f45f916 58 case 138: //NETBIOS datagram service
andrewboyson 42:222a4f45f916 59 case 139: //NETBIOS session service
andrewboyson 42:222a4f45f916 60 case 500: //Key exchange - Xbox live
andrewboyson 42:222a4f45f916 61 case 1900: //SSDP Simple Service Discovery Protocol (uPnP)
andrewboyson 42:222a4f45f916 62 case 3074: //Xbox live
andrewboyson 42:222a4f45f916 63 case 3076: //Call of Duty - Xbox
andrewboyson 52:fbc5a46b5e16 64 case 5050: //Don't know but have been sent by Kate and my android phones.
andrewboyson 42:222a4f45f916 65 case 5224: //Don't know but a burst was broadcast by Kate's phone containing '_logitech-reverse-bonjour._tcp.local.5446 192.168.1.36 string'
andrewboyson 52:fbc5a46b5e16 66 case 9956: //Alljoyn part of Allseen IoT services
andrewboyson 42:222a4f45f916 67 case 9997: //VLC
andrewboyson 42:222a4f45f916 68 case 9998: //VLC
andrewboyson 42:222a4f45f916 69 case 9999: //VLC
andrewboyson 42:222a4f45f916 70 case 17500: //Dropbox LAN sync
andrewboyson 95:b9a99049016a 71 case 57621: //Spotify P2P
andrewboyson 10:f0854784e960 72 return DO_NOTHING;
andrewboyson 10:f0854784e960 73
andrewboyson 10:f0854784e960 74 //Report anything else
andrewboyson 10:f0854784e960 75 default:
andrewboyson 52:fbc5a46b5e16 76 if (UdpTrace)
andrewboyson 52:fbc5a46b5e16 77 {
andrewboyson 52:fbc5a46b5e16 78 LogTimeF("UDP unknown port %d\r\n", dstPort);
andrewboyson 52:fbc5a46b5e16 79 traceback(); //This will already include the UDP header
andrewboyson 52:fbc5a46b5e16 80 }
andrewboyson 10:f0854784e960 81 return DO_NOTHING;
andrewboyson 10:f0854784e960 82 }
andrewboyson 10:f0854784e960 83 }
andrewboyson 59:e0e556c8bd46 84 int UdpHandleReceivedPacket(void (*traceback)(void), int sizeRx, void* pPacketRx, int* pSizeTx, void* pPacketTx)
andrewboyson 10:f0854784e960 85 {
andrewboyson 59:e0e556c8bd46 86 readHeader(pPacketRx, sizeRx);
andrewboyson 59:e0e556c8bd46 87
andrewboyson 61:aad055f1b0d1 88 void* pDataRx = (char*)pPacketRx + sizeof(struct header);
andrewboyson 61:aad055f1b0d1 89 void* pDataTx = (char*)pPacketTx + sizeof(struct header);
andrewboyson 61:aad055f1b0d1 90 int dataLengthRx = sizeRx - sizeof(struct header);
andrewboyson 61:aad055f1b0d1 91 int dataLengthTx = *pSizeTx - sizeof(struct header);
andrewboyson 10:f0854784e960 92
andrewboyson 59:e0e556c8bd46 93 int action = handlePort(traceback, dataLengthRx, pDataRx, &dataLengthTx, pDataTx);
andrewboyson 10:f0854784e960 94
andrewboyson 61:aad055f1b0d1 95 *pSizeTx = dataLengthTx + sizeof(struct header);
andrewboyson 10:f0854784e960 96
andrewboyson 37:793b39683406 97 uint16_t tmpPort = dstPort;
andrewboyson 37:793b39683406 98 dstPort = srcPort;
andrewboyson 37:793b39683406 99 srcPort = tmpPort;
andrewboyson 10:f0854784e960 100
andrewboyson 10:f0854784e960 101 return action;
andrewboyson 10:f0854784e960 102 }
andrewboyson 10:f0854784e960 103 static int pollForPacketToSend(int type, int* pDataLength, void* pData)
andrewboyson 10:f0854784e960 104 {
andrewboyson 37:793b39683406 105 int action = DO_NOTHING;
andrewboyson 10:f0854784e960 106
andrewboyson 10:f0854784e960 107 if (!action && type == IPV4) //DHCP only works under IPv4
andrewboyson 10:f0854784e960 108 {
andrewboyson 10:f0854784e960 109 action = DhcpPollForRequestToSend(pData, pDataLength);
andrewboyson 10:f0854784e960 110 if (action)
andrewboyson 10:f0854784e960 111 {
andrewboyson 37:793b39683406 112 srcPort = DHCP_CLIENT_PORT;
andrewboyson 37:793b39683406 113 dstPort = DHCP_SERVER_PORT;
andrewboyson 10:f0854784e960 114 }
andrewboyson 10:f0854784e960 115 }
andrewboyson 10:f0854784e960 116
andrewboyson 83:08c983006a6e 117 if (!action && type == (DnsSendRequestsViaIp4 ? IPV4 : IPV6)) //DNS is agnostic
andrewboyson 10:f0854784e960 118 {
andrewboyson 13:9cd54f7db57a 119 action = DnsPollForPacketToSend(pData, pDataLength);
andrewboyson 37:793b39683406 120 int dest = ActionGetDestPart(action);
andrewboyson 37:793b39683406 121 if (dest)
andrewboyson 10:f0854784e960 122 {
andrewboyson 37:793b39683406 123 switch (dest)
andrewboyson 10:f0854784e960 124 {
andrewboyson 37:793b39683406 125 case UNICAST_DNS: srcPort = DNS_UNICAST_CLIENT_PORT; dstPort = DNS_UNICAST_SERVER_PORT; break; //53053, 53
andrewboyson 37:793b39683406 126 case MULTICAST_MDNS: srcPort = DNS_MDNS_PORT; dstPort = DNS_MDNS_PORT; break; // 5353, 5353
andrewboyson 37:793b39683406 127 case MULTICAST_LLMNR: srcPort = DNS_LLMNR_CLIENT_PORT; dstPort = DNS_LLMNR_SERVER_PORT; break; //53055, 5355
andrewboyson 10:f0854784e960 128
andrewboyson 10:f0854784e960 129 //Report anything else
andrewboyson 10:f0854784e960 130 default:
andrewboyson 37:793b39683406 131 LogTimeF("DNS unknown dest %d\r\n", dest);
andrewboyson 10:f0854784e960 132 return DO_NOTHING;
andrewboyson 10:f0854784e960 133 }
andrewboyson 10:f0854784e960 134 }
andrewboyson 10:f0854784e960 135 }
andrewboyson 83:08c983006a6e 136 if (!action && type == (NtpSendRequestsViaIp4 ? IPV4 : IPV6)) //NTP is agnostic
andrewboyson 22:914b970356f0 137 {
andrewboyson 22:914b970356f0 138 action = NtpPollForPacketToSend(type, pData, pDataLength);
andrewboyson 22:914b970356f0 139 if (action)
andrewboyson 22:914b970356f0 140 {
andrewboyson 37:793b39683406 141 srcPort = NTP_PORT;
andrewboyson 37:793b39683406 142 dstPort = NTP_PORT;
andrewboyson 22:914b970356f0 143 }
andrewboyson 22:914b970356f0 144 }
andrewboyson 83:08c983006a6e 145 if (!action && type == (TftpSendRequestsViaIp4 ? IPV4 : IPV6)) //TFTP is agnostic
andrewboyson 57:e0fb648acf48 146 {
andrewboyson 57:e0fb648acf48 147 action = TftpPollForPacketToSend(type, pData, pDataLength);
andrewboyson 57:e0fb648acf48 148 if (action)
andrewboyson 57:e0fb648acf48 149 {
andrewboyson 57:e0fb648acf48 150 srcPort = TFTP_CLIENT_PORT;
andrewboyson 57:e0fb648acf48 151 dstPort = TFTP_SERVER_PORT;
andrewboyson 57:e0fb648acf48 152 }
andrewboyson 57:e0fb648acf48 153 }
andrewboyson 37:793b39683406 154
andrewboyson 10:f0854784e960 155 return action;
andrewboyson 10:f0854784e960 156 }
andrewboyson 10:f0854784e960 157 int UdpPollForPacketToSend(int type, int* pSize, void* pPacket)
andrewboyson 10:f0854784e960 158 {
andrewboyson 61:aad055f1b0d1 159 void* pData = (char*)pPacket + sizeof(struct header);
andrewboyson 61:aad055f1b0d1 160 int dataLength = *pSize - sizeof(struct header);
andrewboyson 10:f0854784e960 161
andrewboyson 10:f0854784e960 162 int action = pollForPacketToSend(type, &dataLength, pData);
andrewboyson 10:f0854784e960 163
andrewboyson 61:aad055f1b0d1 164 *pSize = dataLength + sizeof(struct header);
andrewboyson 10:f0854784e960 165 return action;
andrewboyson 10:f0854784e960 166 }
andrewboyson 10:f0854784e960 167
andrewboyson 37:793b39683406 168 void UdpLogHeader(uint16_t calculatedChecksum)
andrewboyson 43:bc028d5a6424 169 {
andrewboyson 43:bc028d5a6424 170 if (NetTraceVerbose)
andrewboyson 43:bc028d5a6424 171 {
andrewboyson 43:bc028d5a6424 172 Log ("UDP header\r\n");
andrewboyson 43:bc028d5a6424 173 LogF(" Source port %hu\r\n", srcPort);
andrewboyson 43:bc028d5a6424 174 LogF(" Destination port %hu\r\n", dstPort);
andrewboyson 43:bc028d5a6424 175 LogF(" Total length %hu\r\n", totalLength);
andrewboyson 43:bc028d5a6424 176 LogF(" Checksum (hex) %04hX\r\n", checksum);
andrewboyson 43:bc028d5a6424 177 LogF(" Calculated %04hX\r\n", calculatedChecksum);
andrewboyson 43:bc028d5a6424 178 }
andrewboyson 43:bc028d5a6424 179 else
andrewboyson 43:bc028d5a6424 180 {
andrewboyson 44:83ce5ace337b 181 LogF("UDP header %hu >>> %hu\r\n", srcPort, dstPort);
andrewboyson 43:bc028d5a6424 182 }
andrewboyson 10:f0854784e960 183 }
andrewboyson 10:f0854784e960 184
andrewboyson 10:f0854784e960 185 void UdpMakeHeader(int size, void* pPacket)
andrewboyson 10:f0854784e960 186 {
andrewboyson 61:aad055f1b0d1 187 struct header* pHeader = (struct header*)pPacket;
andrewboyson 10:f0854784e960 188
andrewboyson 37:793b39683406 189 pHeader->dstPort = NetToHost16(dstPort);
andrewboyson 37:793b39683406 190 pHeader->srcPort = NetToHost16(srcPort);
andrewboyson 10:f0854784e960 191 pHeader->totalLength = NetToHost16(size);
andrewboyson 10:f0854784e960 192 pHeader->checksum = 0;
andrewboyson 10:f0854784e960 193
andrewboyson 10:f0854784e960 194 }
andrewboyson 10:f0854784e960 195 void UdpAddChecksum(void* pPacket, uint16_t checksum)
andrewboyson 10:f0854784e960 196 {
andrewboyson 61:aad055f1b0d1 197 struct header* pHeader = (struct header*)pPacket;
andrewboyson 10:f0854784e960 198 pHeader->checksum = checksum;
andrewboyson 10:f0854784e960 199 }