This source file includes following definitions.
- sctp_csum_update
- sctp_csum_combine
- sctp_compute_cksum
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23 #ifndef __sctp_checksum_h__
24 #define __sctp_checksum_h__
25
26 #include <linux/types.h>
27 #include <net/sctp/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
34
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