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netfilter: don't set F_IFACE on ipv6 fib lookups 

"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>
This commit is contained in:
Florian Westphal 2018-02-15 00:23:05 +01:00 committed by Pablo Neira Ayuso
parent 2412d897c2
commit 47b7e7f828
2 changed files with 2 additions and 14 deletions
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4
net/ipv6/netfilter/ip6t_rpfilter.c
View File

@ -48,10 +48,6 @@ static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
}
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)

12
net/ipv6/netfilter/nft_fib_ipv6.c
View File

@ -180,7 +180,6 @@ void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
}
*dest = 0;
again:
rt = (void *)ip6_route_lookup(nft_net(pkt), &fl6, lookup_flags);
if (rt->dst.error)
goto put_rt_err;
@ -189,15 +188,8 @@ void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
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: