netdev - Re: SCTP checksum patch for 2.6.26.5

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Date:	Mon, 22 Sep 2008 13:12:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nickolay@...tei.ru
Cc:	linux-kernel@...r.kernel.org, linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: SCTP checksum patch for 2.6.26.5

From: Nickolay Vinogradov <nickolay@...tei.ru>
Date: Mon, 22 Sep 2008 19:58:26 +0400

CC:'ing correct mailing lists...

> SCTP checksum calculation fix for BigEndian.
> ntohl() doesn't do anything on BigEndian.
> 
> diff --git a/Makefile b/Makefile
> diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
> index ba75c67..2f0ed64 100644
> --- a/include/net/sctp/checksum.h
> +++ b/include/net/sctp/checksum.h
> @@ -74,5 +74,19 @@ static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
> 
>   static inline __u32 sctp_end_cksum(__u32 crc32)
>   {
> -       return ntohl(~crc32);
> +       __u32 result;
> +       __u8 byte0, byte1, byte2, byte3;
> +
> +       result = ~crc32;
> +
> +       byte0 = result & 0xff;
> +       byte1 = (result>>8) & 0xff;
> +       byte2 = (result>>16) & 0xff;
> +       byte3 = (result>>24) & 0xff;
> +
> +       crc32 = ((byte0 << 24) |
> +                (byte1 << 16) |
> +                (byte2 << 8)  |
> +                byte3);
> +       return crc32;
>   }
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> 
> 
> -- Nickolay Vinogradov
> Protei Research and Development Center
> St.Petersburg, 194044, Russia
> Tel.: +7 812 449 47 27
> --
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