netdev - Re: [PATCH net-next 2/2] flow_dissector: add support for dst, hop-by-hop and routing ext hdrs

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Date:	Fri, 12 Jun 2015 18:50:04 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, Tom Herbert <tom@...bertland.com>,
	edumazet@...gle.com, netdev@...r.kernel.org,
	dan.carpenter@...cle.com
Subject: Re: [PATCH net-next 2/2] flow_dissector: add support for dst,
 hop-by-hop and routing ext hdrs

On Fri, Jun 12, 2015 at 06:37:34PM -0700, Eric Dumazet wrote:
> On Fri, 2015-06-12 at 18:27 -0700, Alexei Starovoitov wrote:
> > On Fri, Jun 12, 2015 at 09:01:06AM -0700, Tom Herbert wrote:
> > > If dst, hop-by-hop or routing extension headers are present determine
> > > length of the options and skip over them in flow dissection.
> > > 
> > > Signed-off-by: Tom Herbert <tom@...bertland.com>
> > > ---
> > >  net/core/flow_dissector.c | 17 +++++++++++++++++
> > >  1 file changed, 17 insertions(+)
> > > 
> > > diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> > > index 1818cdc..22e4dff 100644
> > > --- a/net/core/flow_dissector.c
> > > +++ b/net/core/flow_dissector.c
> > > @@ -327,6 +327,7 @@ mpls:
> > >  		return false;
> > >  	}
> > >  
> > > +ip_proto_again:
> > >  	switch (ip_proto) {
> > >  	case IPPROTO_GRE: {
> > >  		struct gre_hdr {
> > > @@ -383,6 +384,22 @@ mpls:
> > >  		}
> > >  		goto again;
> > >  	}
> > > +	case NEXTHDR_HOP:
> > > +	case NEXTHDR_ROUTING:
> > > +	case NEXTHDR_DEST: {
> > > +		u8 _opthdr[2], *opthdr;
> > > +
> > > +		if (proto != htons(ETH_P_IPV6))
> > > +			break;
> > > +
> > > +		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
> > > +					      data, hlen, &_opthdr);
> > > +
> > > +		ip_proto = _opthdr[0];
> > > +		nhoff += (_opthdr[1] + 1) << 3;
> > > +
> > > +		goto ip_proto_again;
> > > +	}
> > 
> > Dave,
> > 
> > please revert it. My server locks up during boot with:
> 
> Seems easy to fix instead ?
> 
> diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> index 22e4dffa0c8b3b9a20a7324eae1627313e14ce30..476e5dda59e19822dba98a931369ff2666c59c0d 100644
> --- a/net/core/flow_dissector.c
> +++ b/net/core/flow_dissector.c
> @@ -394,9 +394,11 @@ ip_proto_again:
>  
>  		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
>  					      data, hlen, &_opthdr);
> +		if (!opthdr)
> +			return false;
>  
> -		ip_proto = _opthdr[0];
> -		nhoff += (_opthdr[1] + 1) << 3;
> +		ip_proto = opthdr[0];
> +		nhoff += (opthdr[1] + 1) << 3;
>  
>  		goto ip_proto_again;
>  	}
> 

sure, that's better.
If you're going to submit it officialy, please add my Tested-by.
My server is happy now :)

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