tree f0e29586ba3af5fe02b569016bef1e596015fa3f
parent 6a662719c9868b3d6c7d26b3a085f0cd3cc15e64
author Cong Wang <cwang@twopensource.com> 1397604335 -0700
committer David S. Miller <davem@davemloft.net> 1397675112 -0400

ipv4, route: pass 0 instead of LOOPBACK_IFINDEX to fib_validate_source()

In my special case, when a packet is redirected from veth0 to lo,
its skb->dev->ifindex would be LOOPBACK_IFINDEX. Meanwhile we
pass the hard-coded LOOPBACK_IFINDEX to fib_validate_source()
in ip_route_input_slow(). This would cause the following check
in fib_validate_source() fail:

            (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))

when rp_filter is disabeld on loopback. As suggested by Julian,
the caller should pass 0 here so that we will not end up by
calling __fib_validate_source().

Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>