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fou: reject IPv6 config

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fou does not really support IPv6 encapsulation. After an UDP socket is
created in fou_create, the encap_rcv callback is set either to fou_udp_recv
or to gue_udp_recv. Both of those unconditionally assume that the received
packet has an IPv4 header and access the data at network_header as it was an
IPv4 header. This leads to IPv6 flow label being interpreted as IP packet
length, etc.

Disallow fou tunnel to be configured as IPv6 until real IPv6 support is
added to fou.

CC: Tom Herbert <tom@herbertland.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2015-08-28 20:48:21 +02:00 committed by David S. Miller
parent 7f9562a1f4
commit b9b6695cf0
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/fou.c
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@ -566,7 +566,7 @@ static int parse_nl_config(struct genl_info *info,
if (info->attrs[FOU_ATTR_AF]) {
u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]);
if (family != AF_INET && family != AF_INET6)
if (family != AF_INET)
return -EINVAL;
cfg->udp_config.family = family;