netdev - Re: [PATCH] macvlan: Skip loopback packets in RX handler

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Message-Id: <20200526.231859.398097568630300979.davem@davemloft.net>
Date:   Tue, 26 May 2020 23:18:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     alexander.sverdlin@...ia.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] macvlan: Skip loopback packets in RX handler

From: Alexander A Sverdlin <alexander.sverdlin@...ia.com>
Date: Tue, 26 May 2020 14:27:51 +0200

> From: Alexander Sverdlin <alexander.sverdlin@...ia.com>
> 
> Ignore loopback-originatig packets soon enough and don't try to process L2
> header where it doesn't exist. The very similar br_handle_frame() in bridge
> code performs exactly the same check.
> 
> This is an example of such ICMPv6 packet:
 ...
> Call Trace, how it happens exactly:
>  ...
>  macvlan_handle_frame+0x321/0x425 [macvlan]
>  ? macvlan_forward_source+0x110/0x110 [macvlan]
>  __netif_receive_skb_core+0x545/0xda0
 ...
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>

Applied to net-next, thanks.