Diff: PPP-Blinky/ppp-blinky.h

Revision:

159:4d1bf96a59cd

Parent:

156:163c23249731

Child:

160:bd701ad564cb

--- a/PPP-Blinky/ppp-blinky.h	Sat Sep 02 01:55:19 2017 +0000
+++ b/PPP-Blinky/ppp-blinky.h	Sat Sep 02 07:48:53 2017 +0000
@@ -10,14 +10,14 @@
 void waitForPppFrame();
 void determinePacketType();
 
-/// structure of a PPP header
+/// PPP header
 typedef struct { // [ff 03 00 21]
     unsigned int pppAddress : 8;  // always 0xff
     unsigned int pppControl : 8;  // always 03
     unsigned int pppProtocol : 16; // 2100 for IP (byte reversed, should be 0021)
 } pppHeaderType;
 
-/// structure of an IP header for little-endian devices
+/// IP header
 typedef struct {
     unsigned int headerLength   :  4;  // ip headerlength / 4
     unsigned int version        :  4;  // ip version number
@@ -37,10 +37,22 @@
     unsigned int dstAdrR; // destination IP address
 } ipHeaderType;
 
-/// structure of TCP header
+/// IP pseudoheader
 typedef struct {
-    unsigned int    srcAdrR : 16; // byte reversed
-    unsigned int    dstAdrR : 16; // byte reversed
+    union {
+    unsigned char start [0];        
+    unsigned int srcAdrR; // source IP address
+    };
+    unsigned int dstAdrR; // destination IP address
+    unsigned int zero     :  8;
+    unsigned int protocol :  8;
+    unsigned int lengthR  : 16; // byte reversed
+} pseudoIpHeaderType;
+
+/// TCP header
+typedef struct {
+    unsigned int    srcPortR : 16; // byte reversed
+    unsigned int    dstPortR : 16; // byte reversed
     unsigned int    seqTcpR;      // byte reversed
     unsigned int    ackTcpR;      // byte reversed
     unsigned int resvd1  : 4;  // reserved
@@ -63,3 +75,4 @@
     unsigned int    urgentPointerR : 16; // byte reversed;
     unsigned int    tcpOptions[10]; // up to 10 words of options possible
 } tcpHeaderType;
+