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-rw-r--r--include/uapi/linux/in6.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h
index 440d5c47914..f94f1d013bf 100644
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -188,6 +188,10 @@ enum {
#define IPV6_PMTUDISC_WANT 1
#define IPV6_PMTUDISC_DO 2
#define IPV6_PMTUDISC_PROBE 3
+/* same as IPV6_PMTUDISC_PROBE, provided for symetry with IPv4
+ * also see comments on IP_PMTUDISC_INTERFACE
+ */
+#define IPV6_PMTUDISC_INTERFACE 4
/* Flowlabel */
#define IPV6_FLOWLABEL_MGR 32