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

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

[Ye Yin]

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@gmail.com>
Signed-off-by: Wei Zhou <chouryzhou@gmail.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

Re: [PATCH] netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed

[Julian Anastasov]

	Hello,

On Thu, 26 Oct 2017, Ye Yin wrote:

> 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@gmail.com>
> Signed-off-by: Wei Zhou <chouryzhou@gmail.com>

	Patch looks good to me. ipvs_property was added long ago
but skb_scrub_packet() is more recent (3.11), so:

Fixes: 621e84d6f373 ("dev: introduce skb_scrub_packet()")
Signed-off-by: Julian Anastasov <ja@ssi.bg>

	I guess, DaveM can apply it directly as a bugfix
to the net tree.

> ---
>  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

Regards

--
Julian Anastasov <ja@ssi.bg>

Re: [PATCH] netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed

[Simon Horman]

On Sat, Oct 28, 2017 at 01:33:09PM +0300, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Thu, 26 Oct 2017, Ye Yin wrote:
> 
> > 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@gmail.com>
> > Signed-off-by: Wei Zhou <chouryzhou@gmail.com>
> 
> 	Patch looks good to me. ipvs_property was added long ago
> but skb_scrub_packet() is more recent (3.11), so:
> 
> Fixes: 621e84d6f373 ("dev: introduce skb_scrub_packet()")
> Signed-off-by: Julian Anastasov <ja@ssi.bg>
> 
> 	I guess, DaveM can apply it directly as a bugfix
> to the net tree.

Sounds like a good plan to me, Dave?

Signed-off-by: Simon Horman <horms@verge.net.au>

Re: [PATCH] netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed

[David Miller]

From: Simon Horman <horms@verge.net.au>
Date: Thu, 2 Nov 2017 15:46:50 +0100

> On Sat, Oct 28, 2017 at 01:33:09PM +0300, Julian Anastasov wrote:
>> 
>> 	Hello,
>> 
>> On Thu, 26 Oct 2017, Ye Yin wrote:
>> 
>> > 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@gmail.com>
>> > Signed-off-by: Wei Zhou <chouryzhou@gmail.com>
>> 
>> 	Patch looks good to me. ipvs_property was added long ago
>> but skb_scrub_packet() is more recent (3.11), so:
>> 
>> Fixes: 621e84d6f373 ("dev: introduce skb_scrub_packet()")
>> Signed-off-by: Julian Anastasov <ja@ssi.bg>
>> 
>> 	I guess, DaveM can apply it directly as a bugfix
>> to the net tree.
> 
> Sounds like a good plan to me, Dave?
> 
> Signed-off-by: Simon Horman <horms@verge.net.au>

Sure, applied and queued up for -stable, thanks!