netdev - [PATCH] net: shy netns

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Message-ID: <20081112001509.GA2749@x200.localdomain>
Date:	Wed, 12 Nov 2008 03:15:09 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, den@...nvz.org
Subject: [PATCH] net: shy netns_ok check

Sigh...

Failure to pass netns_ok check is SILENT, except some MIB counted is
incremented somewhere.

And adding "netns_ok = 1" (after long head-scratching session) is usually
the last step in making some protocol netns-ready...

Please, apply.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 net/ipv4/ip_input.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -209,9 +209,17 @@ static int ip_local_deliver_finish(struct sk_buff *skb)
 
 		hash = protocol & (MAX_INET_PROTOS - 1);
 		ipprot = rcu_dereference(inet_protos[hash]);
-		if (ipprot != NULL && (net == &init_net || ipprot->netns_ok)) {
+		if (ipprot != NULL) {
 			int ret;
 
+			if (!net_eq(net, &init_net) && !ipprot->netns_ok) {
+				if (net_ratelimit())
+					printk("%s: proto %d isn't netns-ready\n",
+						__func__, protocol);
+				kfree_skb(skb);
+				goto out;
+			}
+
 			if (!ipprot->no_policy) {
 				if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
 					kfree_skb(skb);
--
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