netdev - Re: [net-next fragmenation icmp 1/2] ipv4_fragment: Add a bit in IPCB to control ICMP generation

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Date:	Wed, 06 May 2015 05:23:54 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andy Zhou <azhou@...ira.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [net-next fragmenation icmp 1/2] ipv4_fragment: Add a bit in
 IPCB to control ICMP generation

On Tue, 2015-05-05 at 18:59 -0700, Andy Zhou wrote:
> Currently, on fragmentation or defragmentation error, ICMP error message
> can be generated. This is fine when they are used in a routing context,
> but does not make sense when they are used in a bridging context, i.e.
> netfilter for bridging.
> 
> This patch adds a bit in IPCB to control whether ICMP error message
> should be generated.
> 
> IPV6 fragmentation and defragmentation functions are not reused by
> bridge netfilter. Thus, this change is only required for IPV4.
> 
> Signed-off-by: Andy Zhou <azhou@...ira.com>
> ---
>  include/net/inet_frag.h |  2 ++
>  include/net/ip.h        |  1 +
>  net/ipv4/ip_fragment.c  | 11 ++++++++++-
>  net/ipv4/ip_output.c    |  5 +++--
>  4 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
> index 8d17655..1d57045 100644
> --- a/include/net/inet_frag.h
> +++ b/include/net/inet_frag.h
> @@ -44,6 +44,7 @@ enum {
>   * @meat: length of received fragments so far
>   * @flags: fragment queue flags
>   * @max_size: (ipv4 only) maximum received fragment size with IP_DF set
> + * @no_icmp:  Do not generate any fragmentation related icmp packet
>   * @net: namespace that this frag belongs to
>   */
>  struct inet_frag_queue {
> @@ -58,6 +59,7 @@ struct inet_frag_queue {
>  	int			meat;
>  	__u8			flags;
>  	u16			max_size;
> +	bool			no_icmp;
>  	struct netns_frags	*net;
>  };
>  


What about filling the 8bit hole ?

 	int			meat;
  	__u8			flags;
+	bool			no_icmp;
  	u16			max_size;
  	struct netns_frags	*net;



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