subnet routing

[unix-history] / usr / src / sys / netinet / in.h

diff --git a/usr/src/sys/netinet/in.h b/usr/src/sys/netinet/in.h
index 825a9d3..3e36206 100644 (file)
--- a/usr/src/sys/netinet/in.h
+++ b/usr/src/sys/netinet/in.h
@@ -1,4 +1,4 @@
-/*     in.h    6.1     83/07/29        */
+/*     in.h    6.2     84/04/12        */

 
 /*
  * Constants and structures defined by the internet system,
 
 /*
  * Constants and structures defined by the internet system,


@@ -95,11 +95,13 @@ struct in_addr {
 #define        IN_CLASSA_NET           0xff000000
 #define        IN_CLASSA_NSHIFT        24
 #define        IN_CLASSA_HOST          0x00ffffff
 #define        IN_CLASSA_NET           0xff000000
 #define        IN_CLASSA_NSHIFT        24
 #define        IN_CLASSA_HOST          0x00ffffff

+#define        IN_CLASSA_MAX           128

 
 #define        IN_CLASSB(i)            ((((long)(i))&0xc0000000)==0x80000000)
 #define        IN_CLASSB_NET           0xffff0000
 #define        IN_CLASSB_NSHIFT        16
 #define        IN_CLASSB_HOST          0x0000ffff
 
 #define        IN_CLASSB(i)            ((((long)(i))&0xc0000000)==0x80000000)
 #define        IN_CLASSB_NET           0xffff0000
 #define        IN_CLASSB_NSHIFT        16
 #define        IN_CLASSB_HOST          0x0000ffff

+#define        IN_CLASSB_MAX           65536

 
 #define        IN_CLASSC(i)            ((((long)(i))&0xc0000000)==0xc0000000)
 #define        IN_CLASSC_NET           0xffffff00
 
 #define        IN_CLASSC(i)            ((((long)(i))&0xc0000000)==0xc0000000)
 #define        IN_CLASSC_NET           0xffffff00


@@ -108,6 +110,29 @@ struct in_addr {
 
 #define        INADDR_ANY      0x00000000
 
 
 #define        INADDR_ANY      0x00000000
 

+/*
+ * Macros for subnetworks.  A subnet is distinguished by
+ *     (1) the network number is a `local' network number, and
+ *     (2) the most significant bit of the host part is set.
+ * Such addresses include one additional byte in the network number,
+ * and use one less byte in the host part (i.e., a subnet of a Class A
+ * network uses the rules for Class B net/host number extraction,
+ * a Class B subnet is dealt with as if it were a Class C net).
+ * Subnets of Class C nets are not supported.
+ */
+#define        SUBNETSHIFT             8  /* used to get main net number from subnet */
+
+#define        IN_SUBNETA(i)           ((((long)(i))&0x80800000)==0x00800000)
+#define        IN_CLASSA_SUBNET        0xffff0000
+#define        IN_CLASSA_SUBNSHIFT     (IN_CLASSA_NSHIFT - SUBNETSHIFT)
+#define        IN_CLASSA_SUBHOST       0x0000ffff
+
+#define        IN_SUBNETB(i)           ((((long)(i))&0xc0008000)==0x80008000)
+#define        IN_CLASSB_SUBNET        0xffffff00
+#define        IN_CLASSB_SUBNSHIFT     (IN_CLASSB_NSHIFT - SUBNETSHIFT)
+#define        IN_CLASSA_SUBHOST       0x0000ffff
+#define        IN_CLASSB_SUBHOST       0x000000ff
+

 /*
  * Socket address, internet style.
  */
 /*
  * Socket address, internet style.
  */