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Based on 1 normalized pattern(s): the sctp reference implementation is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 or at your option any later version the sctp reference implementation is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with gnu cc see the file copying if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091649.408473526@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* 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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* 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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#include <linux/crc32.h>
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static inline __wsum sctp_csum_update(const void *buff, int len, __wsum sum)
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{
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/* This uses the crypto implementation of crc32c, which is either
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* implemented w/ hardware support or resolves to __crc32c_le().
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*/
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return (__force __wsum)crc32c((__force __u32)sum, buff, len);
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}
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static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2,
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int offset, int len)
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{
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return (__force __wsum)__crc32c_le_combine((__force __u32)csum,
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(__force __u32)csum2, len);
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}
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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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struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
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const struct skb_checksum_ops ops = {
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.update = sctp_csum_update,
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.combine = sctp_csum_combine,
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};
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__le32 old = sh->checksum;
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__wsum new;
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sh->checksum = 0;
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new = ~__skb_checksum(skb, offset, skb->len - offset, ~(__wsum)0, &ops);
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sh->checksum = old;
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return cpu_to_le32((__force __u32)new);
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}
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#endif /* __sctp_checksum_h__ */
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