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.cpp@52:fbc5a46b5e16, 2017-11-08 (annotated)

Committer:
andrewboyson
Date:
Wed Nov 08 20:46:36 2017 +0000
Revision:
52:fbc5a46b5e16
Parent:
44:83ce5ace337b
Child:
57:e0fb648acf48
Fixed bug in NDP options decoder which was crashing the system

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 37:793b39683406 1 #include "mbed.h"
andrewboyson 37:793b39683406 2 #include "log.h"
andrewboyson 37:793b39683406 3 #include "net.h"
andrewboyson 37:793b39683406 4 #include "action.h"
andrewboyson 37:793b39683406 5 #include "udp.h"
andrewboyson 37:793b39683406 6 #include "ntp.h"
andrewboyson 37:793b39683406 7 #include "dhcp.h"
andrewboyson 37:793b39683406 8 #include "dns.h"
andrewboyson 37:793b39683406 9 #include "eth.h"
andrewboyson 37:793b39683406 10 #include "ip4.h"
andrewboyson 37:793b39683406 11 #include "ip6.h"
andrewboyson 37:793b39683406 12 #include "slaac.h"
andrewboyson 37:793b39683406 13 #include "ns.h"
andrewboyson 37:793b39683406 14 #include "io.h"
andrewboyson 10:f0854784e960 15
andrewboyson 52:fbc5a46b5e16 16 bool UdpTrace = true;
andrewboyson 10:f0854784e960 17
andrewboyson 10:f0854784e960 18 #define HEADER_SIZE 8
andrewboyson 10:f0854784e960 19 __packed struct header
andrewboyson 10:f0854784e960 20 {
andrewboyson 10:f0854784e960 21 uint16_t srcPort;
andrewboyson 10:f0854784e960 22 uint16_t dstPort;
andrewboyson 10:f0854784e960 23 uint16_t totalLength;
andrewboyson 10:f0854784e960 24 uint16_t checksum;
andrewboyson 10:f0854784e960 25 };
andrewboyson 37:793b39683406 26 static uint16_t srcPort;
andrewboyson 37:793b39683406 27 static uint16_t dstPort;
andrewboyson 10:f0854784e960 28 static uint16_t checksum;
andrewboyson 10:f0854784e960 29 static uint16_t totalLength;
andrewboyson 10:f0854784e960 30
andrewboyson 37:793b39683406 31 static int handlePort(void (*traceback)(void), int* pDataLength, void* pData)
andrewboyson 10:f0854784e960 32 {
andrewboyson 37:793b39683406 33 switch (dstPort)
andrewboyson 10:f0854784e960 34 {
andrewboyson 10:f0854784e960 35 //Handle these
andrewboyson 37:793b39683406 36 case DHCP_CLIENT_PORT: return DhcpHandleResponse (traceback, pDataLength, pData); // 68
andrewboyson 37:793b39683406 37 case NTP_PORT: return NtpHandlePacketReceived(traceback, pDataLength, pData); // 123
andrewboyson 37:793b39683406 38 case DNS_UNICAST_CLIENT_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_UDNS, pDataLength, pData); //53053
andrewboyson 37:793b39683406 39 case DNS_MDNS_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_MDNS, pDataLength, pData); // 5353
andrewboyson 37:793b39683406 40 case DNS_LLMNR_CLIENT_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_LLMNR, pDataLength, pData); //53055
andrewboyson 37:793b39683406 41 case DNS_LLMNR_SERVER_PORT: return DnsHandlePacketReceived(traceback, DNS_PROTOCOL_LLMNR, pDataLength, pData); // 5355
andrewboyson 10:f0854784e960 42
andrewboyson 10:f0854784e960 43 //Quietly drop these
andrewboyson 42:222a4f45f916 44 case DHCP_SERVER_PORT: //67
andrewboyson 42:222a4f45f916 45 case 137: //NETBIOS name service
andrewboyson 42:222a4f45f916 46 case 138: //NETBIOS datagram service
andrewboyson 42:222a4f45f916 47 case 139: //NETBIOS session service
andrewboyson 42:222a4f45f916 48 case 500: //Key exchange - Xbox live
andrewboyson 42:222a4f45f916 49 case 1900: //SSDP Simple Service Discovery Protocol (uPnP)
andrewboyson 42:222a4f45f916 50 case 3074: //Xbox live
andrewboyson 42:222a4f45f916 51 case 3076: //Call of Duty - Xbox
andrewboyson 52:fbc5a46b5e16 52 case 5050: //Don't know but have been sent by Kate and my android phones.
andrewboyson 42:222a4f45f916 53 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 54 case 9956: //Alljoyn part of Allseen IoT services
andrewboyson 42:222a4f45f916 55 case 9997: //VLC
andrewboyson 42:222a4f45f916 56 case 9998: //VLC
andrewboyson 42:222a4f45f916 57 case 9999: //VLC
andrewboyson 42:222a4f45f916 58 case 17500: //Dropbox LAN sync
andrewboyson 10:f0854784e960 59 return DO_NOTHING;
andrewboyson 10:f0854784e960 60
andrewboyson 10:f0854784e960 61 //Report anything else
andrewboyson 10:f0854784e960 62 default:
andrewboyson 52:fbc5a46b5e16 63 if (UdpTrace)
andrewboyson 52:fbc5a46b5e16 64 {
andrewboyson 52:fbc5a46b5e16 65 LogTimeF("UDP unknown port %d\r\n", dstPort);
andrewboyson 52:fbc5a46b5e16 66 traceback(); //This will already include the UDP header
andrewboyson 52:fbc5a46b5e16 67 }
andrewboyson 10:f0854784e960 68 return DO_NOTHING;
andrewboyson 10:f0854784e960 69 }
andrewboyson 10:f0854784e960 70 }
andrewboyson 37:793b39683406 71 int UdpHandleReceivedPacket(void (*traceback)(void), int* pSize, void* pPacket)
andrewboyson 10:f0854784e960 72 {
andrewboyson 10:f0854784e960 73 void* pData = (char*)pPacket + HEADER_SIZE;
andrewboyson 10:f0854784e960 74 int dataLength = *pSize - HEADER_SIZE;
andrewboyson 10:f0854784e960 75
andrewboyson 37:793b39683406 76 int action = handlePort(traceback, &dataLength, pData);
andrewboyson 10:f0854784e960 77
andrewboyson 10:f0854784e960 78 *pSize = dataLength + HEADER_SIZE;
andrewboyson 10:f0854784e960 79
andrewboyson 37:793b39683406 80 uint16_t tmpPort = dstPort;
andrewboyson 37:793b39683406 81 dstPort = srcPort;
andrewboyson 37:793b39683406 82 srcPort = tmpPort;
andrewboyson 10:f0854784e960 83
andrewboyson 10:f0854784e960 84 return action;
andrewboyson 10:f0854784e960 85 }
andrewboyson 10:f0854784e960 86 static int pollForPacketToSend(int type, int* pDataLength, void* pData)
andrewboyson 10:f0854784e960 87 {
andrewboyson 37:793b39683406 88 int action = DO_NOTHING;
andrewboyson 42:222a4f45f916 89 uint16_t preferredPolledIpType = NetPreferIp4Polled ? IPV4 : IPV6;
andrewboyson 10:f0854784e960 90
andrewboyson 10:f0854784e960 91 if (!action && type == IPV4) //DHCP only works under IPv4
andrewboyson 10:f0854784e960 92 {
andrewboyson 10:f0854784e960 93 action = DhcpPollForRequestToSend(pData, pDataLength);
andrewboyson 10:f0854784e960 94 if (action)
andrewboyson 10:f0854784e960 95 {
andrewboyson 37:793b39683406 96 srcPort = DHCP_CLIENT_PORT;
andrewboyson 37:793b39683406 97 dstPort = DHCP_SERVER_PORT;
andrewboyson 10:f0854784e960 98 }
andrewboyson 10:f0854784e960 99 }
andrewboyson 10:f0854784e960 100
andrewboyson 42:222a4f45f916 101 if (!action && type == preferredPolledIpType) //DNS is agnostic
andrewboyson 10:f0854784e960 102 {
andrewboyson 13:9cd54f7db57a 103 action = DnsPollForPacketToSend(pData, pDataLength);
andrewboyson 37:793b39683406 104 int dest = ActionGetDestPart(action);
andrewboyson 37:793b39683406 105 if (dest)
andrewboyson 10:f0854784e960 106 {
andrewboyson 37:793b39683406 107 switch (dest)
andrewboyson 10:f0854784e960 108 {
andrewboyson 37:793b39683406 109 case UNICAST_DNS: srcPort = DNS_UNICAST_CLIENT_PORT; dstPort = DNS_UNICAST_SERVER_PORT; break; //53053, 53
andrewboyson 37:793b39683406 110 case MULTICAST_MDNS: srcPort = DNS_MDNS_PORT; dstPort = DNS_MDNS_PORT; break; // 5353, 5353
andrewboyson 37:793b39683406 111 case MULTICAST_LLMNR: srcPort = DNS_LLMNR_CLIENT_PORT; dstPort = DNS_LLMNR_SERVER_PORT; break; //53055, 5355
andrewboyson 10:f0854784e960 112
andrewboyson 10:f0854784e960 113 //Report anything else
andrewboyson 10:f0854784e960 114 default:
andrewboyson 37:793b39683406 115 LogTimeF("DNS unknown dest %d\r\n", dest);
andrewboyson 10:f0854784e960 116 return DO_NOTHING;
andrewboyson 10:f0854784e960 117 }
andrewboyson 10:f0854784e960 118 }
andrewboyson 10:f0854784e960 119 }
andrewboyson 42:222a4f45f916 120 if (!action && type == preferredPolledIpType) //NTP is agnostic
andrewboyson 22:914b970356f0 121 {
andrewboyson 22:914b970356f0 122 action = NtpPollForPacketToSend(type, pData, pDataLength);
andrewboyson 22:914b970356f0 123 if (action)
andrewboyson 22:914b970356f0 124 {
andrewboyson 37:793b39683406 125 srcPort = NTP_PORT;
andrewboyson 37:793b39683406 126 dstPort = NTP_PORT;
andrewboyson 22:914b970356f0 127 }
andrewboyson 22:914b970356f0 128 }
andrewboyson 37:793b39683406 129
andrewboyson 10:f0854784e960 130 return action;
andrewboyson 10:f0854784e960 131 }
andrewboyson 10:f0854784e960 132 int UdpPollForPacketToSend(int type, int* pSize, void* pPacket)
andrewboyson 10:f0854784e960 133 {
andrewboyson 10:f0854784e960 134 void* pData = (char*)pPacket + HEADER_SIZE;
andrewboyson 10:f0854784e960 135 int dataLength = *pSize - HEADER_SIZE;
andrewboyson 10:f0854784e960 136
andrewboyson 10:f0854784e960 137 int action = pollForPacketToSend(type, &dataLength, pData);
andrewboyson 10:f0854784e960 138
andrewboyson 10:f0854784e960 139 *pSize = dataLength + HEADER_SIZE;
andrewboyson 10:f0854784e960 140 return action;
andrewboyson 10:f0854784e960 141 }
andrewboyson 10:f0854784e960 142
andrewboyson 37:793b39683406 143 void UdpLogHeader(uint16_t calculatedChecksum)
andrewboyson 43:bc028d5a6424 144 {
andrewboyson 43:bc028d5a6424 145 if (NetTraceVerbose)
andrewboyson 43:bc028d5a6424 146 {
andrewboyson 43:bc028d5a6424 147 Log ("UDP header\r\n");
andrewboyson 43:bc028d5a6424 148 LogF(" Source port %hu\r\n", srcPort);
andrewboyson 43:bc028d5a6424 149 LogF(" Destination port %hu\r\n", dstPort);
andrewboyson 43:bc028d5a6424 150 LogF(" Total length %hu\r\n", totalLength);
andrewboyson 43:bc028d5a6424 151 LogF(" Checksum (hex) %04hX\r\n", checksum);
andrewboyson 43:bc028d5a6424 152 LogF(" Calculated %04hX\r\n", calculatedChecksum);
andrewboyson 43:bc028d5a6424 153 }
andrewboyson 43:bc028d5a6424 154 else
andrewboyson 43:bc028d5a6424 155 {
andrewboyson 44:83ce5ace337b 156 LogF("UDP header %hu >>> %hu\r\n", srcPort, dstPort);
andrewboyson 43:bc028d5a6424 157 }
andrewboyson 10:f0854784e960 158 }
andrewboyson 10:f0854784e960 159
andrewboyson 10:f0854784e960 160 void UdpMakeHeader(int size, void* pPacket)
andrewboyson 10:f0854784e960 161 {
andrewboyson 10:f0854784e960 162 struct header* pHeader = (header*)pPacket;
andrewboyson 10:f0854784e960 163
andrewboyson 37:793b39683406 164 pHeader->dstPort = NetToHost16(dstPort);
andrewboyson 37:793b39683406 165 pHeader->srcPort = NetToHost16(srcPort);
andrewboyson 10:f0854784e960 166 pHeader->totalLength = NetToHost16(size);
andrewboyson 10:f0854784e960 167 pHeader->checksum = 0;
andrewboyson 10:f0854784e960 168
andrewboyson 10:f0854784e960 169 }
andrewboyson 10:f0854784e960 170 void UdpAddChecksum(void* pPacket, uint16_t checksum)
andrewboyson 10:f0854784e960 171 {
andrewboyson 10:f0854784e960 172 struct header* pHeader = (header*)pPacket;
andrewboyson 10:f0854784e960 173 pHeader->checksum = checksum;
andrewboyson 10:f0854784e960 174 }
andrewboyson 10:f0854784e960 175 void UdpReadHeader(void* pPacket, uint16_t size)
andrewboyson 10:f0854784e960 176 {
andrewboyson 10:f0854784e960 177 struct header* pHeader = (header*)pPacket;
andrewboyson 10:f0854784e960 178
andrewboyson 37:793b39683406 179 srcPort = NetToHost16(pHeader->srcPort);
andrewboyson 37:793b39683406 180 dstPort = NetToHost16(pHeader->dstPort);
andrewboyson 10:f0854784e960 181 totalLength = NetToHost16(pHeader->totalLength);
andrewboyson 10:f0854784e960 182 checksum = NetToHost16(pHeader->checksum);
andrewboyson 10:f0854784e960 183 }