system-linux: Set ignore-df flag on GRE tunnels

This is required to make `gretap` fragment packets according to https://bugzilla.kernel.org/show_bug.cgi?id=14837 Signed-off-by: Matthew Bilker <[email protected]>
openwrt · Oct 8, 2024 · d383d1f · d383d1f
1 parent 3c6265f
commit d383d1f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/system-linux.c b/system-linux.c
@@ -4010,6 +4010,7 @@ static int system_add_gre_tunnel(const char *name, const char *kind,
 			ttl = 64;
 
 		nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
+		nla_put_u8(nlm, IFLA_GRE_IGNORE_DF, set_df ? 0 : 1);
 
 		nla_put_u8(nlm, IFLA_GRE_TOS, tos);
 	}