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Y29waWVzLgo+Cg==
On Fri, 2010-12-31 at 01:29 +0200, Winkler, Tomas wrote:
>
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:[email protected]]
> > Sent: Friday, December 31, 2010 1:06 AM
> > To: Winkler, Tomas; Stephen Hemminger; Johannes Berg
> > Cc: [email protected]; [email protected] ; linux-
> > [email protected]
> > Subject: RE: [PATCH net-2.6] bridge: fix br_multicast_ipv6_rcv for paged
> > skbs
> >
> > Although copy is slower for large packets, this is a non performance path.
> > The code in question is for bridged multicast Ipv6 ICMP packets. This case
> > is so uncritical it could be done in BASIC and no one could possibly care!
> >
>
>
> Fair enough, although you got few of those when you connect to win7 client.
> Anyhow my fix would work if the second pull would be
> if (!pskb_may_pull(skb2, sizeof(struct mld_msg))) instead of (!pskb_may_pull(skb2, sizeof(*icmp6h)))
I don't think that works either since that may be longer than the entire
skb's length since the payload still is variable at this point.
johannes
> -----Original Message-----
> From: David Miller [mailto:[email protected]]
> Sent: Friday, December 31, 2010 10:46 PM
> To: [email protected]
> Cc: Winkler, Tomas; [email protected]; [email protected];
> [email protected]; [email protected]
> Subject: Re: [PATCH net-2.6] bridge: fix br_multicast_ipv6_rcv for paged
> skbs
>
> From: Stephen Hemminger <[email protected]>
> Date: Thu, 30 Dec 2010 15:06:16 -0800
>
> > Although copy is slower for large packets, this is a non performance
> > path. The code in question is for bridged multicast Ipv6 ICMP
> > packets. This case is so uncritical it could be done in BASIC and no
> > one could possibly care!
>
> I still think we should be judicious and keep using skb_clone() here.
>
> Simply combine the two pskb_may_pull() calls into one on "skb2" after
> the clone and before the blind __skb_pull() call. Then add a error
> path "out:" called "out_nopush:" for the error path to goto.
>
> Also, I think the "+ 1" in the ipv6 stack code comes from the fact that
> the parsing loop can "peek" into the next header's byte to see the type.
> And I really don't think it's relevant here.
>
> Also, all of these "x_header + ... + 1 - skb->data" factors are
> irrelevent and shouldn't be used. Just pass "offset + sizeof(*icmp6h)"
> to pskb_may_pull().
Sounds reasonable but maybe we shall pass offset + sizeof(struct mld_msg) as *icmp6h is casted to this struct mld_mca is accessed.
struct mld_msg {
struct icmp6hdr mld_hdr;
struct in6_addr mld_mca;
};
Thanks
Tomas
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From: Stephen Hemminger <[email protected]>
Date: Thu, 30 Dec 2010 15:06:16 -0800
> Although copy is slower for large packets, this is a non performance
> path. The code in question is for bridged multicast Ipv6 ICMP
> packets. This case is so uncritical it could be done in BASIC and no
> one could possibly care!
I still think we should be judicious and keep using skb_clone() here.
Simply combine the two pskb_may_pull() calls into one on "skb2" after
the clone and before the blind __skb_pull() call. Then add a error
path "out:" called "out_nopush:" for the error path to goto.
Also, I think the "+ 1" in the ipv6 stack code comes from the fact that
the parsing loop can "peek" into the next header's byte to see the type.
And I really don't think it's relevant here.
Also, all of these "x_header + ... + 1 - skb->data" factors are
irrelevent and shouldn't be used. Just pass "offset + sizeof(*icmp6h)"
to pskb_may_pull().
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