netdev - Re: [PATCH 1/2] dst: take into account policy update on check()

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Date:	Fri, 07 Sep 2012 16:35:10 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	vyasevich@...il.com, davem@...emloft.net, sri@...ibm.com,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] dst: take into account policy update on check()

On Fri, 2012-09-07 at 17:57 +0200, Nicolas Dichtel wrote:
> When a xfrm policy is inserted or deleted, we must invalidate
> all dst and recalculate the route.
> 
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> ---
>  include/net/dst.h     | 7 +++++++
>  net/core/dst.c        | 1 +
>  net/core/sock.c       | 4 ++--
>  net/ipv6/ip6_tunnel.c | 3 +--
>  4 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 9a78810..478e55a 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -101,6 +101,9 @@ struct dst_entry {
>  	atomic_t		__refcnt;	/* client references	*/
>  	int			__use;
>  	unsigned long		lastuse;
> +#ifdef CONFIG_XFRM
> +	u32			flow_cache_genid;
> +#endif
>  	union {
>  		struct dst_entry	*next;
>  		struct rtable __rcu	*rt_next;
> @@ -457,6 +460,10 @@ static inline int dst_input(struct sk_buff *skb)
>  
>  static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
>  {
> +#ifdef CONFIG_XFRM
> +	if (dst->flow_cache_genid != atomic_read(&flow_cache_genid))
> +		return NULL;
> +#endif

Hmm... cant we reuse rt_genid ?

(When changing flow_cache_genid, change &net->ipv4.rt_genid)



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