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| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
|---|---|
| 2 | /* SCTP kernel reference Implementation |
| 3 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 4 | * Copyright (c) 2001-2003 International Business Machines, Corp. |
| 5 | * |
| 6 | * This file is part of the SCTP kernel reference Implementation |
| 7 | * |
| 8 | * SCTP Checksum functions |
| 9 | * |
| 10 | * Please send any bug reports or fixes you make to the |
| 11 | * email address(es): |
| 12 | * lksctp developers <linux-sctp@vger.kernel.org> |
| 13 | * |
| 14 | * Written or modified by: |
| 15 | * Dinakaran Joseph |
| 16 | * Jon Grimm <jgrimm@us.ibm.com> |
| 17 | * Sridhar Samudrala <sri@us.ibm.com> |
| 18 | * |
| 19 | * Rewritten to use libcrc32c by: |
| 20 | * Vlad Yasevich <vladislav.yasevich@hp.com> |
| 21 | */ |
| 22 | |
| 23 | #ifndef __sctp_checksum_h__ |
| 24 | #define __sctp_checksum_h__ |
| 25 | |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/sctp.h> |
| 28 | #include <linux/crc32c.h> |
| 29 | #include <linux/crc32.h> |
| 30 | |
| 31 | static inline __wsum sctp_csum_update(const void *buff, int len, __wsum sum) |
| 32 | { |
| 33 | /* This uses the crypto implementation of crc32c, which is either |
| 34 | * implemented w/ hardware support or resolves to __crc32c_le(). |
| 35 | */ |
| 36 | return (__force __wsum)crc32c((__force __u32)sum, buff, len); |
| 37 | } |
| 38 | |
| 39 | static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2, |
| 40 | int offset, int len) |
| 41 | { |
| 42 | return (__force __wsum)__crc32c_le_combine((__force __u32)csum, |
| 43 | (__force __u32)csum2, len); |
| 44 | } |
| 45 | |
| 46 | static const struct skb_checksum_ops sctp_csum_ops = { |
| 47 | .update = sctp_csum_update, |
| 48 | .combine = sctp_csum_combine, |
| 49 | }; |
| 50 | |
| 51 | static inline __le32 sctp_compute_cksum(const struct sk_buff *skb, |
| 52 | unsigned int offset) |
| 53 | { |
| 54 | struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); |
| 55 | __le32 old = sh->checksum; |
| 56 | __wsum new; |
| 57 | |
| 58 | sh->checksum = 0; |
| 59 | new = ~__skb_checksum(skb, offset, skb->len - offset, ~(__wsum)0, |
| 60 | &sctp_csum_ops); |
| 61 | sh->checksum = old; |
| 62 | |
| 63 | return cpu_to_le32((__force __u32)new); |
| 64 | } |
| 65 | |
| 66 | #endif /* __sctp_checksum_h__ */ |
| 67 |
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