RealTimeCompLab2
RealtimeCompLab2
Dependencies: mbed
Fork of
PPP-Blinky
by 
Nicolas Nackel
PPP-Blinky/ppp-blinky.h@155:9c6a1d249e26, 2017-09-01 (annotated)
- Committer:
- nixnax
- Date:
- Fri Sep 01 23:04:41 2017 +0000
- Revision:
- 155:9c6a1d249e26
- Parent:
- 154:18b2bd92f557
- Child:
- 156:163c23249731
Working TCP flags in tcpHeaderType.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| nixnax | 142:54d1543e23e5 | 1 | /// ppp-blinky.h |
| nixnax | 142:54d1543e23e5 | 2 | |
| nixnax | 142:54d1543e23e5 | 3 | #include "mbed.h" |
| nixnax | 142:54d1543e23e5 | 4 | #include "sha1.h" |
| nixnax | 142:54d1543e23e5 | 5 | #include "BufferedSerial.h" |
| nixnax | 142:54d1543e23e5 | 6 | |
| nixnax | 144:01d98cf7738e | 7 | void initializePpp(); |
| nixnax | 150:3366bf3d294e | 8 | int connectedPpp(); |
| nixnax | 153:7993def8663f | 9 | void waitForPcConnectString(); |
| nixnax | 142:54d1543e23e5 | 10 | void waitForPppFrame(); |
| nixnax | 152:025c73b6c0a9 | 11 | void determinePacketType(); |
| nixnax | 152:025c73b6c0a9 | 12 | |
| nixnax | 153:7993def8663f | 13 | /// structure of a PPP header |
| nixnax | 153:7993def8663f | 14 | typedef struct { // [ff 03 00 21] |
| nixnax | 154:18b2bd92f557 | 15 | unsigned int pppAddress : 8; // always 0xff |
| nixnax | 154:18b2bd92f557 | 16 | unsigned int pppControl : 8; // always 03 |
| nixnax | 154:18b2bd92f557 | 17 | unsigned int pppProtocol : 16; // 2100 for IP (byte reversed, should be 0021) |
| nixnax | 152:025c73b6c0a9 | 18 | } pppHeaderType; |
| nixnax | 152:025c73b6c0a9 | 19 | |
| nixnax | 154:18b2bd92f557 | 20 | /// structure of an IP header for little-endian devices |
| nixnax | 152:025c73b6c0a9 | 21 | typedef struct { |
| nixnax | 154:18b2bd92f557 | 22 | unsigned int headerLength : 4; // ip headerlength / 4 |
| nixnax | 154:18b2bd92f557 | 23 | unsigned int version : 4; // ip version number |
| nixnax | 154:18b2bd92f557 | 24 | unsigned int ect : 1; // ecn capable transport |
| nixnax | 154:18b2bd92f557 | 25 | unsigned int ce : 1; // ecn-ce |
| nixnax | 154:18b2bd92f557 | 26 | unsigned int dscp : 6; // differentiated services |
| nixnax | 154:18b2bd92f557 | 27 | unsigned int lengthR : 16; // ip packet length (byte-reversed) |
| nixnax | 154:18b2bd92f557 | 28 | unsigned int fragmentOffset : 13; |
| nixnax | 154:18b2bd92f557 | 29 | unsigned int reservedIP : 1; |
| nixnax | 154:18b2bd92f557 | 30 | unsigned int dontFragment : 1; |
| nixnax | 154:18b2bd92f557 | 31 | unsigned int lastFragment : 1; |
| nixnax | 154:18b2bd92f557 | 32 | unsigned int identR : 16; |
| nixnax | 154:18b2bd92f557 | 33 | unsigned int checksum : 16; |
| nixnax | 154:18b2bd92f557 | 34 | unsigned int protocol : 8; // next protocol |
| nixnax | 154:18b2bd92f557 | 35 | unsigned int ttl : 8; |
| nixnax | 154:18b2bd92f557 | 36 | unsigned int srcAdrR; // source IP address |
| nixnax | 154:18b2bd92f557 | 37 | unsigned int dstAdrR; // destination IP address |
| nixnax | 152:025c73b6c0a9 | 38 | } ipHeaderType; |
| nixnax | 152:025c73b6c0a9 | 39 | |
| nixnax | 154:18b2bd92f557 | 40 | /// structure of TCP header |
| nixnax | 152:025c73b6c0a9 | 41 | typedef struct { |
| nixnax | 155:9c6a1d249e26 | 42 | unsigned int srcAdrR : 16; // byte reversed |
| nixnax | 155:9c6a1d249e26 | 43 | unsigned int dstAdrR : 16; // byte reversed |
| nixnax | 155:9c6a1d249e26 | 44 | unsigned int seqTcpR; // byte reversed |
| nixnax | 155:9c6a1d249e26 | 45 | unsigned int ackTcpR; // byte reversed |
| nixnax | 155:9c6a1d249e26 | 46 | // a special union for the flag bits |
| nixnax | 152:025c73b6c0a9 | 47 | union { |
| nixnax | 152:025c73b6c0a9 | 48 | struct { |
| nixnax | 155:9c6a1d249e26 | 49 | unsigned int resvd1 : 4; // reserved |
| nixnax | 155:9c6a1d249e26 | 50 | unsigned int offset : 4; // tcp header length [5..15] |
| nixnax | 155:9c6a1d249e26 | 51 | unsigned int flagFin: 1, // fin |
| nixnax | 155:9c6a1d249e26 | 52 | flagSyn : 1, // syn |
| nixnax | 155:9c6a1d249e26 | 53 | flagRst : 1, // rst |
| nixnax | 155:9c6a1d249e26 | 54 | flagPsh : 1, // psh |
| nixnax | 155:9c6a1d249e26 | 55 | flagAck : 1, // ack |
| nixnax | 155:9c6a1d249e26 | 56 | flagUrg : 1, // urg |
| nixnax | 155:9c6a1d249e26 | 57 | flagEce : 1, // ece |
| nixnax | 155:9c6a1d249e26 | 58 | flagCwr : 1; // cwr |
| nixnax | 155:9c6a1d249e26 | 59 | unsigned int windowR : 16; // byte reversed |
| nixnax | 152:025c73b6c0a9 | 60 | }; |
| nixnax | 155:9c6a1d249e26 | 61 | struct { |
| nixnax | 155:9c6a1d249e26 | 62 | unsigned int : 8; // already dealt with first 8 bits |
| nixnax | 155:9c6a1d249e26 | 63 | unsigned int flagsTcp : 8; // second 8 bits are the tcp flags |
| nixnax | 155:9c6a1d249e26 | 64 | }; |
| nixnax | 155:9c6a1d249e26 | 65 | |
| nixnax | 152:025c73b6c0a9 | 66 | }; |
| nixnax | 155:9c6a1d249e26 | 67 | // end of a special union for the flag bits |
| nixnax | 154:18b2bd92f557 | 68 | unsigned int checksumR : 16; // byte reversed |
| nixnax | 154:18b2bd92f557 | 69 | unsigned int urgentPointerR : 16; // byte reversed; |
| nixnax | 154:18b2bd92f557 | 70 | unsigned int tcpOptions[10]; // up to 10 words of options possible |
| nixnax | 154:18b2bd92f557 | 71 | } tcpHeaderType; |
| nixnax | 152:025c73b6c0a9 | 72 |