netdev - Re: [PATCH ipsec] xfrm: interface: fix the priorities for ipip and ipv6 tunnels

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Message-ID: <20201013092856.GU20687@gauss3.secunet.de>
Date:   Tue, 13 Oct 2020 11:28:56 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Xin Long <lucien.xin@...il.com>
CC:     <netdev@...r.kernel.org>, Herbert Xu <herbert@...dor.apana.org.au>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH ipsec] xfrm: interface: fix the priorities for ipip and
 ipv6 tunnels

On Thu, Oct 08, 2020 at 04:13:24PM +0800, Xin Long wrote:
> As Nicolas noticed in his case, when xfrm_interface module is installed
> the standard IP tunnels will break in receiving packets.
> 
> This is caused by the IP tunnel handlers with a higher priority in xfrm
> interface processing incoming packets by xfrm_input(), which would drop
> the packets and return 0 instead when anything wrong happens.
> 
> Rather than changing xfrm_input(), this patch is to adjust the priority
> for the IP tunnel handlers in xfrm interface, so that the packets would
> go to xfrmi's later than the others', as the others' would not drop the
> packets when the handlers couldn't process them.
> 
> Note that IPCOMP also defines its own IPIP tunnel handler and it calls
> xfrm_input() as well, so we must make its priority lower than xfrmi's,
> which means having xfrmi loaded would still break IPCOMP. We may seek
> another way to fix it in xfrm_input() in the future.
> 
> Reported-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Tested-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Fixes: da9bbf0598c9 ("xfrm: interface: support IPIP and IPIP6 tunnels processing with .cb_handler")
> FIxes: d7b360c2869f ("xfrm: interface: support IP6IP6 and IP6IP tunnels processing with .cb_handler")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied, thanks a lot Xin!