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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: 2e15ea390e ("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>
This commit is contained in:
Jiri Benc 2016-04-27 14:08:01 +02:00 committed by David S. Miller
parent 47ff58050a
commit 946b636f17
1 changed files with 5 additions and 0 deletions
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5
net/ipv4/ip_gre.c
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@ -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;
}