4.14-stable review patch. If anyone has any objections, please let me know.
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From: Florian Westphal fw@strlen.de
commit 47b7e7f82802dced3ac73658bf4b77584a63063f upstream.
"fib" starts to behave strangely when an ipv6 default route is added - the FIB lookup returns a route using 'oif' in this case.
This behaviour was inherited from ip6tables rpfilter so change this as well.
Bugzilla: https://bugzilla.netfilter.org/show_bug.cgi?id=1221 Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ipv6/netfilter/ip6t_rpfilter.c | 4 ---- net/ipv6/netfilter/nft_fib_ipv6.c | 12 ++---------- 2 files changed, 2 insertions(+), 14 deletions(-)
--- a/net/ipv6/netfilter/ip6t_rpfilter.c +++ b/net/ipv6/netfilter/ip6t_rpfilter.c @@ -48,10 +48,6 @@ static bool rpfilter_lookup_reverse6(str }
fl6.flowi6_mark = flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0; - if ((flags & XT_RPFILTER_LOOSE) == 0) { - fl6.flowi6_oif = dev->ifindex; - lookup_flags |= RT6_LOOKUP_F_IFACE; - }
rt = (void *) ip6_route_lookup(net, &fl6, lookup_flags); if (rt->dst.error) --- a/net/ipv6/netfilter/nft_fib_ipv6.c +++ b/net/ipv6/netfilter/nft_fib_ipv6.c @@ -182,7 +182,6 @@ void nft_fib6_eval(const struct nft_expr }
*dest = 0; - again: rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, lookup_flags); if (rt->dst.error) goto put_rt_err; @@ -191,15 +190,8 @@ void nft_fib6_eval(const struct nft_expr if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL)) goto put_rt_err;
- if (oif && oif != rt->rt6i_idev->dev) { - /* multipath route? Try again with F_IFACE */ - if ((lookup_flags & RT6_LOOKUP_F_IFACE) == 0) { - lookup_flags |= RT6_LOOKUP_F_IFACE; - fl6.flowi6_oif = oif->ifindex; - ip6_rt_put(rt); - goto again; - } - } + if (oif && oif != rt->rt6i_idev->dev) + goto put_rt_err;
switch (priv->result) { case NFT_FIB_RESULT_OIF: