tree 206cb09c12678bc8afeda31b02927bc1edb30124
parent 7f9562a1f405306eacb97f95d78cb996e33f27f5
author Jiri Benc <jbenc@redhat.com> 1440787701 +0200
committer David S. Miller <davem@davemloft.net> 1440878874 -0700

fou: reject IPv6 config

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>