xnu-1228.15.4.tar.gz

[apple/xnu.git] / bsd / netinet / ip.h

diff --git a/bsd/netinet/ip.h b/bsd/netinet/ip.h
index cc5131a0ac68dd58d5a374aa95e4f95b2794dc1f..c21698f61e541225cdb54ebb732519700f9d9f9b 100644 (file)
--- a/bsd/netinet/ip.h
+++ b/bsd/netinet/ip.h
@@ -121,10 +121,21 @@ struct ip {
 #define        IPTOS_THROUGHPUT        0x08
 #define        IPTOS_RELIABILITY       0x04
 #define        IPTOS_MINCOST           0x02
-/* ECN bits proposed by Sally Floyd */
-#define        IPTOS_CE                0x01    /* congestion experienced */
-#define        IPTOS_ECT               0x02    /* ECN-capable transport */
+#if 1
+/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
+#define        IPTOS_CE                0x01
+#define        IPTOS_ECT               0x02
+#endif
 
+/*
+ * ECN (Explicit Congestion Notification) codepoints in RFC3168
+ * mapped to the lower 2 bits of the TOS field.
+ */
+#define        IPTOS_ECN_NOTECT        0x00    /* not-ECT */
+#define        IPTOS_ECN_ECT1          0x01    /* ECN-capable transport (1) */
+#define        IPTOS_ECN_ECT0          0x02    /* ECN-capable transport (0) */
+#define        IPTOS_ECN_CE            0x03    /* congestion experienced */
+#define        IPTOS_ECN_MASK          0x03    /* ECN field mask */
 
 /*
  * Definitions for IP precedence (also in ip_tos) (hopefully unused)