diff options
Diffstat (limited to 'include/net/sctp/checksum.h')
| -rw-r--r-- | include/net/sctp/checksum.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h new file mode 100644 index 000000000..654d37ec0 --- /dev/null +++ b/include/net/sctp/checksum.h @@ -0,0 +1,40 @@ +/* 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__ */ |