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

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Date:	Fri, 19 Apr 2013 09:10:43 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Vlad Yasevich <vyasevich@...il.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] sctp: Correct type and usage of sctp_end_cksum()

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>
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