netdev - Re: [PATCH ipsec] xfrm: allow to accept packets with ipv6 NEXTHDR_HOP in xfrm

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Date:   Mon, 20 Apr 2020 12:36:06 +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>,
        "David S. Miller" <davem@...emloft.net>,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: Re: [PATCH ipsec] xfrm: allow to accept packets with ipv6
 NEXTHDR_HOP in xfrm_input

On Fri, Apr 10, 2020 at 05:06:01PM +0800, Xin Long wrote:
> For beet mode, when it's ipv6 inner address with nexthdrs set,
> the packet format might be:
> 
>     ----------------------------------------------------
>     | outer  |     | dest |     |      |  ESP    | ESP |
>     | IP hdr | ESP | opts.| TCP | Data | Trailer | ICV |
>     ----------------------------------------------------
> 
> The nexthdr from ESP could be NEXTHDR_HOP(0), so it should
> continue processing the packet when nexthdr returns 0 in
> xfrm_input(). Otherwise, when ipv6 nexthdr is set, the
> packet will be dropped.
> 
> I don't see any error cases that nexthdr may return 0. So
> fix it by removing the check for nexthdr == 0.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied, thanks!