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

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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 <[email protected]>
Cc: Julian Anastasov <[email protected]>
Cc: David S. Miller <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Cong Wang 2014-04-15 16:25:35 -07:00 • committed by David S. Miller
commit 0d5edc6873
1 changed files with 1 additions and 2 deletions
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3
net/ipv4/route.c
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@ -1700,8 +1700,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
if (res.type == RTN_LOCAL) {
err = fib_validate_source(skb, saddr, daddr, tos,
LOOPBACK_IFINDEX,
dev, in_dev, &itag);
0, dev, in_dev, &itag);
if (err < 0)
goto martian_source_keep_err;
goto local_input;