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-rw-r--r--sys/netinet/in.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netinet/in.h b/sys/netinet/in.h
index d5e4290..52844f0 100644
--- a/sys/netinet/in.h
+++ b/sys/netinet/in.h
@@ -392,6 +392,8 @@ __END_DECLS
#define IN_LOOPBACKNET 127 /* official! */
+#define IN_RFC3021_MASK (u_int32_t)0xfffffffe
+
/*
* Options for use with [gs]etsockopt at the IP level.
* First word of comment is data type; bool is stored in int.
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