commit d82db8550a2fc7ec573b28073317532ec7ca873e
author Szabolcs Nagy <nsz@port70.net> Tue Feb 25 00:28:31 2014 +0100
committer Szabolcs Nagy <nsz@port70.net> Tue Feb 25 00:28:31 2014 +0100
tree 6bd873d706fd55a005962b0df232af7f3f444c71
parent fb5a2ef8dfd9d5b7686865ec6bafe33398ec452f

in.h: new IP_MTU_DISCOVER mode IP_PMTUDISC_INTERFACE

introduced in linux v3.13, 482fc6094afad572a4ea1fd722e7b11ca72022a0
to mitigate dns cache poisoning via fragmentation

include/netinet/in.h

diff --git a/include/netinet/in.h b/include/netinet/in.h
index 2e25afe..ee6e19f 100644
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@@ -217,6 +217,7 @@
 #define IP_PMTUDISC_WANT   1
 #define IP_PMTUDISC_DO     2
 #define IP_PMTUDISC_PROBE  3
+#define IP_PMTUDISC_INTERFACE 4
 
 #define IP_DEFAULT_MULTICAST_TTL        1
 #define IP_DEFAULT_MULTICAST_LOOP       1