netdev - Re: [patch net] team: loadbalance: push lacpdus to exact delivery

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Date:   Thu, 25 Aug 2016 09:37:35 -0700
From:   Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     linux-netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, idosch@...lanox.com,
        eladr@...lanox.com, yotamg@...lanox.com
Subject: Re: [patch net] team: loadbalance: push lacpdus to exact delivery

On Thu, Aug 25, 2016 at 9:23 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> When team is in bridge and LACP is utilized, LACPDU packets are pushed
> to userspace using raw socket and there they are processed. However,
> since 8626c56c8279b, LACPDU skbs are dropped by bridge rx_handler so
> they never reach packet handlers in rx path. Fix this by explicity treat
> LACPDUs to be pushed to exact delivery in team rx_handler.
>
> Reported-by: Ido Schimmel <idosch@...lanox.com>
> Fixes: 8626c56c8279b ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict")
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  drivers/net/team/team_mode_loadbalance.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
> index cdb19b3..e7c8210 100644
> --- a/drivers/net/team/team_mode_loadbalance.c
> +++ b/drivers/net/team/team_mode_loadbalance.c
> @@ -17,6 +17,19 @@
>  #include <linux/filter.h>
>  #include <linux/if_team.h>
>
> +static rx_handler_result_t lb_receive(struct team *team, struct team_port *port,
> +                                     struct sk_buff *skb)
> +{
> +       if (unlikely(skb->protocol == htons(ETH_P_SLOW))) {
> +               /* LACPDU packets should go to exact delivery */
> +               const unsigned char *dest = eth_hdr(skb)->h_dest;
> +
> +               if (is_link_local_ether_addr(dest) && dest[5] == 0x02)
> +                       return RX_HANDLER_EXACT;
I believe every link-local-frame should get this treatment whether
it's 802.3ad or otherwise (e.g. LLDP etc.), no?
BTW same should be true for bonding too (of course except LACP since
it handles/consumes it!)
> +       }
> +       return RX_HANDLER_ANOTHER;
> +}
> +
>  struct lb_priv;
>
>  typedef struct team_port *lb_select_tx_port_func_t(struct team *,
> @@ -652,6 +665,7 @@ static const struct team_mode_ops lb_mode_ops = {
>         .port_enter             = lb_port_enter,
>         .port_leave             = lb_port_leave,
>         .port_disabled          = lb_port_disabled,
> +       .receive                = lb_receive,
>         .transmit               = lb_transmit,
>  };
>
> --
> 2.5.5
>