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

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Date:   Thu, 26 Oct 2017 16:57:05 +0800
From:   Ye Yin <hustcat@...il.com>
To:     davem@...emloft.net
Cc:     willemb@...gle.com, edumazet@...gle.com, johannes.berg@...el.com,
        dcaratti@...hat.com, pabeni@...hat.com, f.fainelli@...il.com,
        fw@...len.de, soheil@...gle.com, dwindsor@...il.com,
        elena.reshetova@...el.com, tom@...ntonium.net, Jason@...c4.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Ye Yin <hustcat@...il.com>, Wei Zhou <chouryzhou@...il.com>
Subject: [PATCH] netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed

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.

Signed-off-by: Ye Yin <hustcat@...il.com>
Signed-off-by: Wei Zhou <chouryzhou@...il.com>
---
 include/linux/skbuff.h | 7 +++++++
 net/core/skbuff.c      | 1 +
 2 files changed, 8 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 72299ef..d448a48 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3770,6 +3770,13 @@ static inline void nf_reset_trace(struct sk_buff *skb)
 #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,
 			     bool copy)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 2465607..e140ba4 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4864,6 +4864,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
 	if (!xnet)
 		return;
 
+	ipvs_reset(skb);
 	skb_orphan(skb);
 	skb->mark = 0;
 }
-- 
1.7.12.4