From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Thu, 13 Nov 2008 07:23:51 +0000 (-0800)
Subject: net: shy netns_ok check
X-Git-Tag: firefly_0821_release~16788^2~21
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9c0188acf6dd6990bac9cd906cd554a1476c6d12;p=firefly-linux-kernel-4.4.55.git

net: shy netns_ok check

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

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

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 861978a4f1a8..cfb38ac9d698 100644
--- 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);