| /* 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> |
| * Vlad Yasevich <vladislav.yasevich@hp.com> |
| */ |
| |
| #ifndef __sctp_checksum_h__ |
| #define __sctp_checksum_h__ |
| |
| #include <linux/types.h> |
| #include <linux/sctp.h> |
| |
| 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; |
| u32 new; |
| |
| sh->checksum = 0; |
| new = ~skb_crc32c(skb, offset, skb->len - offset, ~0); |
| sh->checksum = old; |
| return cpu_to_le32(new); |
| } |
| |
| #endif /* __sctp_checksum_h__ */ |
