route: filter routes by family if it's specified
Currently when we specify AF_INET6 when it is disabled, we will get
all routes.
For example, we can boot kernel with ipv6.disable=1 and try to get ipv6
routes:
$ ip -6 route show
default via 192.168.122.1 dev eth0 proto static metric 100
192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.141 metric 100
Here are ipv4 routes and this is unexpected behaviour.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
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