Re: [Qemu-devel] [PATCH 05/12] netfilter: hook packets before receive

[Jason Wang <jasowang@redhat.com>]

On 07/29/2015 06:51 PM, Yang Hongyang wrote:
> Capture packets that will be sent.
>
> Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
> ---
>  include/net/filter.h | 16 +++++++++++++
>  net/net.c            | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 80 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/filter.h b/include/net/filter.h
> index 1dd86cf..5292563 100644
> --- a/include/net/filter.h
> +++ b/include/net/filter.h
> @@ -12,11 +12,27 @@
>  #include "qemu/typedefs.h"
>  
>  typedef void (FilterCleanup) (NetFilterState *);
> +/*
> + * Return:
> + *   0: finished handling the packet, we should continue
> + *   size: filter stolen this packet, we stop pass this packet further
> + */
> +typedef ssize_t (FilterReceive)(NetFilterState *, NetClientState *sender,
> +                                unsigned flags, const uint8_t *, size_t);

Looks like there's no need for this. Just add a wrapper and pretend a
single iov should be ok?