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477143e3fe
With the restructuring of the lksctp.org site, we only allow bug reports through the SCTP mailing list linux-sctp@vger.kernel.org, not via SF, as SF is only used for web hosting and nothing more. While at it, also remove the obvious statement that bugs will be fixed and incooperated into the kernel. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* SCTP kernel reference Implementation
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001-2003 International Business Machines, Corp.
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*
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* This file is part of the SCTP kernel reference Implementation
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*
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* SCTP Checksum functions
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*
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* The SCTP reference implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* The SCTP reference implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Dinakaran Joseph
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* Jon Grimm <jgrimm@us.ibm.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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*
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* Rewritten to use libcrc32c by:
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* Vlad Yasevich <vladislav.yasevich@hp.com>
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*/
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#ifndef __sctp_checksum_h__
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#define __sctp_checksum_h__
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#include <linux/types.h>
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#include <net/sctp/sctp.h>
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#include <linux/crc32c.h>
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static inline __u32 sctp_crc32c(__u32 crc, u8 *buffer, u16 length)
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{
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return crc32c(crc, buffer, length);
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}
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static inline __u32 sctp_start_cksum(__u8 *buffer, __u16 length)
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{
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__u32 crc = ~(__u32)0;
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__u8 zero[sizeof(__u32)] = {0};
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/* Optimize this routine to be SCTP specific, knowing how
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* to skip the checksum field of the SCTP header.
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*/
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/* Calculate CRC up to the checksum. */
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crc = sctp_crc32c(crc, buffer, sizeof(struct sctphdr) - sizeof(__u32));
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/* Skip checksum field of the header. */
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crc = sctp_crc32c(crc, zero, sizeof(__u32));
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/* Calculate the rest of the CRC. */
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crc = sctp_crc32c(crc, &buffer[sizeof(struct sctphdr)],
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length - sizeof(struct sctphdr));
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return crc;
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}
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static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
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{
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return sctp_crc32c(crc32, buffer, length);
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}
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static inline __le32 sctp_end_cksum(__u32 crc32)
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{
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return cpu_to_le32(~crc32);
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}
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/* Calculate the CRC32C checksum of an SCTP packet. */
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static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
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unsigned int offset)
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{
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const struct sk_buff *iter;
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__u32 crc32 = sctp_start_cksum(skb->data + offset,
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skb_headlen(skb) - offset);
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skb_walk_frags(skb, iter)
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crc32 = sctp_update_cksum((__u8 *) iter->data,
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skb_headlen(iter), crc32);
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return sctp_end_cksum(crc32);
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}
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#endif /* __sctp_checksum_h__ */
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