diff mbox series

[4.4,256/312] gre: reject GUE and FOU in collect metadata mode

Message ID 20200508123142.402612829@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 8, 2020, 12:34 p.m. UTC 
From: Jiri Benc <jbenc@redhat.com>

commit 946b636f1730c64e05ff7fe8cf7136422fa8ea70 upstream.

The collect metadata mode does not support GUE nor FOU. This might be
implemented later; until then, we should reject such config.

I think this is okay to be changed. It's unlikely anyone has such
configuration (as it doesn't work anyway) and we may need a way to
distinguish whether it's supported or not by the kernel later.

For backwards compatibility with iproute2, it's not possible to just check
the attribute presence (iproute2 always includes the attribute), the actual
value has to be checked, too.

Fixes: 2e15ea390e6f4 ("ip_gre: Add support to collect tunnel metadata.")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/ipv4/ip_gre.c |    5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -937,6 +937,11 @@  static int ipgre_tunnel_validate(struct
 	if (flags & (GRE_VERSION|GRE_ROUTING))
 		return -EINVAL;
 
+	if (data[IFLA_GRE_COLLECT_METADATA] &&
+	    data[IFLA_GRE_ENCAP_TYPE] &&
+	    nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE)
+		return -EINVAL;
+
 	return 0;
 }