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auth.h	3.74 MB	View DL Edit
checksum.h	1.78 MB	View DL Edit
command.h	8.57 MB	View DL Edit
constants.h	13.8 MB	View DL Edit
sctp.h	20.27 MB	View DL Edit
sm.h	15.97 MB	View DL Edit
stream_interleave.h	1.62 MB	View DL Edit
stream_sched.h	2.34 MB	View DL Edit
structs.h	67.2 MB	View DL Edit
tsnmap.h	4.73 MB	View DL Edit
ulpevent.h	5.47 MB	View DL Edit
ulpqueue.h	2.23 MB	View DL Edit

Edit file: /usr/src/kernels/5.14.0-611.27.1.el9_7.x86_64/include/net/sctp/checksum.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SCTP kernel reference Implementation
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2003 International Business Machines, Corp.
 *
 * This file is part of the SCTP kernel reference Implementation
 *
 * SCTP Checksum functions
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *    Dinakaran Joseph
 *    Jon Grimm <jgrimm@us.ibm.com>
 *    Sridhar Samudrala <sri@us.ibm.com>
 *
 * Rewritten to use libcrc32c by:
 *    Vlad Yasevich <vladislav.yasevich@hp.com>
 */

#ifndef __sctp_checksum_h__
#define __sctp_checksum_h__

#include <linux/types.h>
#include <linux/sctp.h>
#include <linux/crc32c.h>
#include <linux/crc32.h>

static inline __wsum sctp_csum_update(const void *buff, int len, __wsum sum)
{
	/* This uses the crypto implementation of crc32c, which is either
	 * implemented w/ hardware support or resolves to __crc32c_le().
	 */
	return (__force __wsum)crc32c((__force __u32)sum, buff, len);
}

static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2,
				       int offset, int len)
{
	return (__force __wsum)__crc32c_le_combine((__force __u32)csum,
						   (__force __u32)csum2, len);
}

static const struct skb_checksum_ops sctp_csum_ops = {
	.update  = sctp_csum_update,
	.combine = sctp_csum_combine,
};

static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
					unsigned int offset)
{
	struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
	__le32 old = sh->checksum;
	__wsum new;

sh->checksum = 0;
	new = ~__skb_checksum(skb, offset, skb->len - offset, ~(__wsum)0,
			      &sctp_csum_ops);
	sh->checksum = old;

return cpu_to_le32((__force __u32)new);
}

#endif /* __sctp_checksum_h__ */

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