Diff: PPP-Blinky/ppp-blinky.h

Revision:

152:025c73b6c0a9

Parent:

150:3366bf3d294e

Child:

153:7993def8663f

--- a/PPP-Blinky/ppp-blinky.h	Wed Aug 30 16:34:51 2017 +0000
+++ b/PPP-Blinky/ppp-blinky.h	Fri Sep 01 15:25:04 2017 +0000
@@ -8,4 +8,77 @@
 int connectedPpp();
 void scanForConnectString();
 void waitForPppFrame();
-void determinePacketType();
\ No newline at end of file
+void determinePacketType();
+
+typedef struct { // ff 03 00 21 
+    unsigned int pppAddress : 8,  // always 0xff
+             pppControl : 8,  // always 03
+             pppProtocol : 16; // 2100 for IP (byte reversed, should be 0021)
+} pppHeaderType;
+
+/// structure of an IP header for small-endian devices
+typedef struct {
+    pppHeaderType pppHeader; // first four bytes is the PPP header [ff 03 00 21]
+    unsigned int headerLength : 4,  // ip headerlength / 4
+             version : 4,  // ip version number
+             ect : 1,  // ecn capable transport
+             ce  : 1,  // ecn-ce
+             dscp : 6,  // differentiated services
+             length : 16; // ip packet length (byte-reversed)
+
+    unsigned int fragmentOffset : 13,
+             reserved : 1,
+             dontFragment : 1,
+             lastFragment : 1,
+             ident : 16;
+
+    unsigned int checksum : 16,
+             protocol : 8,  // next protocol
+             ttl : 8;
+
+    unsigned int    srcAdr; // source IP address
+
+    unsigned int    dstAdr; // destination IP address
+} ipHeaderType;
+
+typedef struct {
+    ipHeaderType ip; // first part of TCP header is IP header
+    unsigned int srcAdr : 16, // byte reversed
+             dstAdr : 16; // byte reversed
+    unsigned int seqTcp;
+    unsigned int ackTcp;
+    unsigned int res1 : 4,
+             offset : 4; // tcp header length [5..15]
+    union {
+        unsigned int flags : 8;
+        struct {
+            unsigned int f:1, s:1, r:1, p:1, a:1, u:1;
+        };
+    };
+    unsigned int window : 16; // byte reversed
+    unsigned int checksum : 16, // byte reversed
+             urgentPointer : 16; // byte reversed;
+    unsigned int tcpOptions[10]; // 10 words of options possible
+} tcpHeaderType1;
+
+typedef struct {
+    ipHeaderType ip;
+    unsigned int options; 
+    unsigned int srcAdr : 16, // byte reversed
+             dstAdr : 16; // byte reversed
+    unsigned int seqTcp;
+    unsigned int ackTcp;
+    unsigned int res1 : 4,
+             offset : 4; // tcp header length [5..15]
+    union {
+        unsigned int flags : 8;
+        struct {
+            unsigned int f:1, s:1, r:1, p:1, a:1, u:1;
+        };
+    };
+    unsigned int window : 16; // byte reversed
+    unsigned int checksum : 16, // byte reversed
+             urgentPointer : 16; // byte reversed;
+    unsigned int tcpOptions[10]; // 10 words of options possible
+} tcpHeaderType2;
+