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-rw-r--r--include/uapi/linux/in.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index f9e8e496ae5d..393c5de09d42 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -115,6 +115,11 @@ struct in_addr {
#define IP_PMTUDISC_WANT 1 /* Use per route hints */
#define IP_PMTUDISC_DO 2 /* Always DF */
#define IP_PMTUDISC_PROBE 3 /* Ignore dst pmtu */
+/* Always use interface mtu (ignores dst pmtu) but don't set DF flag.
+ * Also incoming ICMP frag_needed notifications will be ignored on
+ * this socket to prevent accepting spoofed ones.
+ */
+#define IP_PMTUDISC_INTERFACE 4
#define IP_MULTICAST_IF 32
#define IP_MULTICAST_TTL 33

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