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Diffstat (limited to 'include/net/sctp/checksum.h')
| -rw-r--r-- | include/net/sctp/checksum.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h new file mode 100644 index 000000000..5a9bb09f3 --- /dev/null +++ b/include/net/sctp/checksum.h @@ -0,0 +1,66 @@ +/* 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 <net/sctp/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__ */ |