projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ad0977f VY |
1 | /* SCTP kernel reference Implementation |
| 2 | * Copyright (c) 1999-2001 Motorola, Inc. | |
| 3 | * Copyright (c) 2001-2003 International Business Machines, Corp. | |
| 4 | * | |
| 5 | * This file is part of the SCTP kernel reference Implementation | |
| 6 | * | |
| 7 | * SCTP Checksum functions | |
| 8 | * | |
| 9 | * The SCTP reference implementation is free software; | |
| 10 | * you can redistribute it and/or modify it under the terms of | |
| 11 | * the GNU General Public License as published by | |
| 12 | * the Free Software Foundation; either version 2, or (at your option) | |
| 13 | * any later version. | |
| 14 | * | |
| 15 | * The SCTP reference implementation is distributed in the hope that it | |
| 16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
| 17 | * ************************ | |
| 18 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 19 | * See the GNU General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU General Public License | |
| a6227e26 JK |
22 | * along with GNU CC; see the file COPYING. If not, see |
| 23 | * <http://www.gnu.org/licenses/>. | |
| 9ad0977f VY |
24 | * |
| 25 | * Please send any bug reports or fixes you make to the | |
| 26 | * email address(es): | |
| 91705c61 | 27 | * lksctp developers <linux-sctp@vger.kernel.org> |
| 9ad0977f | 28 | * |
| 9ad0977f VY |
29 | * Written or modified by: |
| 30 | * Dinakaran Joseph | |
| 31 | * Jon Grimm <jgrimm@us.ibm.com> | |
| 32 | * Sridhar Samudrala <sri@us.ibm.com> | |
| 33 | * | |
| 34 | * Rewritten to use libcrc32c by: | |
| 35 | * Vlad Yasevich <vladislav.yasevich@hp.com> | |
| 9ad0977f VY |
36 | */ |
| 37 | ||
| a05b1019 DB |
38 | #ifndef __sctp_checksum_h__ |
| 39 | #define __sctp_checksum_h__ | |
| 40 | ||
| 9ad0977f VY |
41 | #include <linux/types.h> |
| 42 | #include <net/sctp/sctp.h> | |
| 43 | #include <linux/crc32c.h> | |
| e6d8b64b | 44 | #include <linux/crc32.h> |
| 9ad0977f | 45 | |
| e6d8b64b | 46 | static inline __wsum sctp_csum_update(const void *buff, int len, __wsum sum) |
| 9ad0977f | 47 | { |
| e6d8b64b DB |
48 | /* This uses the crypto implementation of crc32c, which is either |
| 49 | * implemented w/ hardware support or resolves to __crc32c_le(). | |
| 9ad0977f | 50 | */ |
| af2697a0 | 51 | return (__force __wsum)crc32c((__force __u32)sum, buff, len); |
| 9ad0977f VY |
52 | } |
| 53 | ||
| e6d8b64b DB |
54 | static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2, |
| 55 | int offset, int len) | |
| 9ad0977f | 56 | { |
| af2697a0 XL |
57 | return (__force __wsum)__crc32c_le_combine((__force __u32)csum, |
| 58 | (__force __u32)csum2, len); | |
| 9ad0977f | 59 | } |
| a05b1019 | 60 | |
| 024ec3de JS |
61 | static inline __le32 sctp_compute_cksum(const struct sk_buff *skb, |
| 62 | unsigned int offset) | |
| 63 | { | |
| e6d8b64b | 64 | struct sctphdr *sh = sctp_hdr(skb); |
| e6d8b64b DB |
65 | const struct skb_checksum_ops ops = { |
| 66 | .update = sctp_csum_update, | |
| 67 | .combine = sctp_csum_combine, | |
| 68 | }; | |
| af2697a0 XL |
69 | __le32 old = sh->checksum; |
| 70 | __wsum new; | |
| 024ec3de | 71 | |
| e6d8b64b | 72 | sh->checksum = 0; |
| af2697a0 | 73 | new = ~__skb_checksum(skb, offset, skb->len - offset, ~(__wsum)0, &ops); |
| e6d8b64b | 74 | sh->checksum = old; |
| 024ec3de | 75 | |
| af2697a0 | 76 | return cpu_to_le32((__force __u32)new); |
| 024ec3de JS |
77 | } |
| 78 | ||
| a05b1019 | 79 | #endif /* __sctp_checksum_h__ */ |