Define IPTOS_CLASS_* macros according to RFC 2474

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

diff --git a/include/netinet/ip.h b/include/netinet/ip.h
index 19e1249..3fe58b9 100644 (file)
--- a/include/netinet/ip.h
+++ b/include/netinet/ip.h
@@ -188,7 +188,25 @@ struct ip_timestamp
 #define        IPTOS_DSCP_EF           0xb8
 
 /*
- * Definitions for IP type of service (ip_tos)
+ * In RFC 2474, Section 4.2.2.1, the Class Selector Codepoints subsume
+ * the old ToS Precedence values.
+ */
+#define        IPTOS_CLASS_MASK                0xe0
+#define        IPTOS_CLASS(class)              ((class) & IPTOS_CLASS_MASK)
+#define        IPTOS_CLASS_CS0                 0x00
+#define        IPTOS_CLASS_CS1                 0x20
+#define        IPTOS_CLASS_CS2                 0x40
+#define        IPTOS_CLASS_CS3                 0x60
+#define        IPTOS_CLASS_CS4                 0x80
+#define        IPTOS_CLASS_CS5                 0xa0
+#define        IPTOS_CLASS_CS6                 0xc0
+#define        IPTOS_CLASS_CS7                 0xe0
+
+#define        IPTOS_CLASS_DEFAULT             IPTOS_CLASS_CS0
+
+/*
+ * Definitions for IP type of service (ip_tos) [deprecated; use DSCP
+ * and CS definitions above instead.]
  */
 #define        IPTOS_TOS_MASK          0x1E
 #define        IPTOS_TOS(tos)          ((tos) & IPTOS_TOS_MASK)
@@ -199,18 +217,18 @@ struct ip_timestamp
 #define        IPTOS_MINCOST           IPTOS_LOWCOST
 
 /*
- * Definitions for IP precedence (also in ip_tos) (hopefully unused)
+ * Definitions for IP precedence (also in ip_tos) [also deprecated.]
  */
-#define        IPTOS_PREC_MASK                 0xe0
-#define        IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
-#define        IPTOS_PREC_NETCONTROL           0xe0
-#define        IPTOS_PREC_INTERNETCONTROL      0xc0
-#define        IPTOS_PREC_CRITIC_ECP           0xa0
-#define        IPTOS_PREC_FLASHOVERRIDE        0x80
-#define        IPTOS_PREC_FLASH                0x60
-#define        IPTOS_PREC_IMMEDIATE            0x40
-#define        IPTOS_PREC_PRIORITY             0x20
-#define        IPTOS_PREC_ROUTINE              0x00
+#define        IPTOS_PREC_MASK                 IPTOS_CLASS_MASK
+#define        IPTOS_PREC(tos)                 IPTOS_CLASS(tos)
+#define        IPTOS_PREC_NETCONTROL           IPTOS_CLASS_CS7
+#define        IPTOS_PREC_INTERNETCONTROL      IPTOS_CLASS_CS6
+#define        IPTOS_PREC_CRITIC_ECP           IPTOS_CLASS_CS5
+#define        IPTOS_PREC_FLASHOVERRIDE        IPTOS_CLASS_CS4
+#define        IPTOS_PREC_FLASH                IPTOS_CLASS_CS3
+#define        IPTOS_PREC_IMMEDIATE            IPTOS_CLASS_CS2
+#define        IPTOS_PREC_PRIORITY             IPTOS_CLASS_CS1
+#define        IPTOS_PREC_ROUTINE              IPTOS_CLASS_CS0
 
 /*
  * Definitions for options.