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authorJiri Benc <jbenc@redhat.com>2016-04-27 14:08:01 +0200
committerDavid S. Miller <davem@davemloft.net>2016-04-28 17:09:37 -0400
commit946b636f1730c64e05ff7fe8cf7136422fa8ea70 (patch)
treeb5bc9f08c93362d866703b251b811143d88f1957 /net
parent47ff58050a7449260d990ab95fafeb84be682e79 (diff)
downloadlinux-946b636f1730c64e05ff7fe8cf7136422fa8ea70.tar.bz2
gre: reject GUE and FOU in collect metadata mode
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_gre.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index f973e0a58993..f502d34bcb40 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -948,6 +948,11 @@ static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
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;
}