linux-kernel - [PATCH 3.16 166/204] netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Ye Yin" <hustcat@...il.com>,
        "Wei Zhou" <chouryzhou@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Julian Anastasov" <ja@....bg>, "Simon Horman" <horms@...ge.net.au>
Subject: [PATCH 3.16 166/204] netfilter/ipvs: clear ipvs_property flag
 when SKB net namespace changed

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ye Yin <hustcat@...il.com>

commit 2b5ec1a5f9738ee7bf8f5ec0526e75e00362c48f upstream.

When run ipvs in two different network namespace at the same host, and one
ipvs transport network traffic to the other network namespace ipvs.
'ipvs_property' flag will make the second ipvs take no effect. So we should
clear 'ipvs_property' when SKB network namespace changed.

Fixes: 621e84d6f373 ("dev: introduce skb_scrub_packet()")
Signed-off-by: Ye Yin <hustcat@...il.com>
Signed-off-by: Wei Zhou <chouryzhou@...il.com>
Signed-off-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/skbuff.h | 7 +++++++
 net/core/skbuff.c      | 1 +
 2 files changed, 8 insertions(+)

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2965,6 +2965,13 @@ static inline void nf_reset_trace(struct
 #endif
 }
 
+static inline void ipvs_reset(struct sk_buff *skb)
+{
+#if IS_ENABLED(CONFIG_IP_VS)
+	skb->ipvs_property = 0;
+#endif
+}
+
 /* Note: This doesn't put any conntrack and bridge info in dst. */
 static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src)
 {
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3961,6 +3961,7 @@ void skb_scrub_packet(struct sk_buff *sk
 	if (!xnet)
 		return;
 
+	ipvs_reset(skb);
 	skb_orphan(skb);
 	skb->mark = 0;
 }