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

mbilker · mbilker · commit d383d1f13224 · 2024-10-08T19:02:19.000Z
This is required to make `gretap` fragment packets according to https://bugzilla.kernel.org/show_bug.cgi?id=14837 Signed-off-by: Matthew Bilker <me@mbilker.us>
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);
 	}

Original file line number	Diff line number	Diff line change
`@@ -4010,6 +4010,7 @@ static int system_add_gre_tunnel(const char name, const char kind,`
`4010`	`4010`	`ttl = 64;`
`4011`	`4011`
`4012`	`4012`	`nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);`
	`4013`	`+ nla_put_u8(nlm, IFLA_GRE_IGNORE_DF, set_df ? 0 : 1);`
`4013`	`4014`
`4014`	`4015`	`nla_put_u8(nlm, IFLA_GRE_TOS, tos);`
`4015`	`4016`	`}`