netdev - Re: [PATCH] sctp: Correct type and usage of sctp_end

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Date:	Fri, 26 Apr 2013 09:28:45 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Vlad Yasevich <vyasevich@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] sctp: Correct type and usage of sctp_end_cksum()

On Thu, Apr 25, 2013 at 04:35:39PM +0200, Pablo Neira Ayuso wrote:
> On Thu, Apr 25, 2013 at 10:12:14PM +0900, Simon Horman wrote:
> > On Fri, Apr 19, 2013 at 09:10:43AM -0400, Neil Horman wrote:
> > > On Fri, Apr 19, 2013 at 10:54:58AM +0900, Simon Horman wrote:
> > > > Change the type of the crc32 parameter of sctp_end_cksum()
> > > > from __be32 to __u32 to reflect that fact that it is passed
> > > > to cpu_to_le32().
> > > > 
> > > > There are five in-tree users of sctp_end_cksum().
> > > > The following four had warnings flagged by sparse which are
> > > > no longer present with this change.
> > > > 
> > > > net/netfilter/ipvs/ip_vs_proto_sctp.c:sctp_nat_csum()
> > > > net/netfilter/ipvs/ip_vs_proto_sctp.c:sctp_csum_check()
> > > > net/sctp/input.c:sctp_rcv_checksum()
> > > > net/sctp/output.c:sctp_packet_transmit()
> > > > 
> > > > The fifth user is net/netfilter/nf_nat_proto_sctp.c:sctp_manip_pkt().
> > > > It has been updated to pass a __u32 instead of a __be32,
> > > > the value in question was already calculated in cpu byte-order.
> > > > 
> > > > net/netfilter/nf_nat_proto_sctp.c:sctp_manip_pkt() has also
> > > > been updated to assign the return value of sctp_end_cksum()
> > > > directly to a variable of type __le32, matching the
> > > > type of the return value. Previously the return value
> > > > was assigned to a variable of type __be32 and then that variable
> > > > was finally assigned to another variable of type __le32.
> > > > 
> > > > Problems flagged by sparse.
> > > > Compile and sparse tested only.
> > > > 
> > > > Signed-off-by: Simon Horman <horms@...ge.net.au>
> > > > ---
> > > >  include/net/sctp/checksum.h       |    2 +-
> > > >  net/netfilter/nf_nat_proto_sctp.c |    5 ++---
> > > >  2 files changed, 3 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
> > > > index befc8d2..5a2110d 100644
> > > > --- a/include/net/sctp/checksum.h
> > > > +++ b/include/net/sctp/checksum.h
> > > > @@ -77,7 +77,7 @@ static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
> > > >  	return sctp_crc32c(crc32, buffer, length);
> > > >  }
> > > >  
> > > > -static inline __le32 sctp_end_cksum(__be32 crc32)
> > > > +static inline __le32 sctp_end_cksum(__u32 crc32)
> > > >  {
> > > >  	return cpu_to_le32(~crc32);
> > > >  }
> > > > diff --git a/net/netfilter/nf_nat_proto_sctp.c b/net/netfilter/nf_nat_proto_sctp.c
> > > > index e64faa5..396e55d 100644
> > > > --- a/net/netfilter/nf_nat_proto_sctp.c
> > > > +++ b/net/netfilter/nf_nat_proto_sctp.c
> > > > @@ -36,7 +36,7 @@ sctp_manip_pkt(struct sk_buff *skb,
> > > >  {
> > > >  	struct sk_buff *frag;
> > > >  	sctp_sctphdr_t *hdr;
> > > > -	__be32 crc32;
> > > > +	__u32 crc32;
> > > >  
> > > >  	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
> > > >  		return false;
> > > > @@ -55,8 +55,7 @@ sctp_manip_pkt(struct sk_buff *skb,
> > > >  	skb_walk_frags(skb, frag)
> > > >  		crc32 = sctp_update_cksum((u8 *)frag->data, skb_headlen(frag),
> > > >  					  crc32);
> > > > -	crc32 = sctp_end_cksum(crc32);
> > > > -	hdr->checksum = crc32;
> > > > +	hdr->checksum = sctp_end_cksum(crc32);
> > > >  
> > > >  	return true;
> > > >  }
> > > > -- 
> > > > 1.7.10.4
> > > > 
> > > > 
> > > Acked-by: Neil Horman <nhorman@...driver.com>
> > 
> > Pablo, are you interested in taking this through nf-next?
> 
> I'll take it. Let's see if we still reach the merge window open yet.

Thanks.
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