netdev - [Patch net] ipv4: fib: check forwarding before checking send

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Date:	Tue,  8 Apr 2014 12:31:22 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Eric Biederman <ebiederm@...ssion.com>,
	Julian Anastasov <ja@....bg>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Cong Wang <cwang@...pensource.com>
Subject: [Patch net] ipv4: fib: check forwarding before checking send_redirects

From: Cong Wang <cwang@...pensource.com>

We have seen in a weird case we had to disable send_redirects in order
to pass rp filter check even though we don't set forwarding at all.
This looks wrong, at least according to ip-sysctl.txt send_redirects should
only make sense when we enable forwarding.

Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Julian Anastasov <ja@....bg>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Cong Wang <cwang@...pensource.com>

---
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 1a629f8..3f9e324 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -321,7 +321,8 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
 	int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
 
 	if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
-	    (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
+	    (dev->ifindex != oif || !IN_DEV_FORWARD(idev) ||
+	     !IN_DEV_TX_REDIRECTS(idev))) {
 		*itag = 0;
 		return 0;
 	}
--
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