blob: da26224a599323250303d0c07d42254b536b5d82 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#include <net/ip.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <asm/checksum.h>
#ifndef _HAVE_ARCH_IPV6_CSUM
__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, unsigned short proto,
__wsum csum)
{
int carry;
__u32 ulen;
__u32 uproto;
__u32 sum = (__force u32)csum;
sum += (__force u32)saddr->s6_addr32[0];
carry = (sum < (__force u32)saddr->s6_addr32[0]);
sum += carry;
sum += (__force u32)saddr->s6_addr32[1];
carry = (sum < (__force u32)saddr->s6_addr32[1]);
sum += carry;
sum += (__force u32)saddr->s6_addr32[2];
carry = (sum < (__force u32)saddr->s6_addr32[2]);
sum += carry;
sum += (__force u32)saddr->s6_addr32[3];
carry = (sum < (__force u32)saddr->s6_addr32[3]);
sum += carry;
sum += (__force u32)daddr->s6_addr32[0];
carry = (sum < (__force u32)daddr->s6_addr32[0]);
sum += carry;
sum += (__force u32)daddr->s6_addr32[1];
carry = (sum < (__force u32)daddr->s6_addr32[1]);
sum += carry;
sum += (__force u32)daddr->s6_addr32[2];
carry = (sum < (__force u32)daddr->s6_addr32[2]);
sum += carry;
sum += (__force u32)daddr->s6_addr32[3];
carry = (sum < (__force u32)daddr->s6_addr32[3]);
sum += carry;
ulen = (__force u32)htonl((__u32) len);
sum += ulen;
carry = (sum < ulen);
sum += carry;
uproto = (__force u32)htonl(proto);
sum += uproto;
carry = (sum < uproto);
sum += carry;
return csum_fold((__force __wsum)sum);
}
EXPORT_SYMBOL(csum_ipv6_magic);
#endif
int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
{
int err;
UDP_SKB_CB(skb)->partial_cov = 0;
UDP_SKB_CB(skb)->cscov = skb->len;
if (proto == IPPROTO_UDPLITE) {
err = udplite_checksum_init(skb, uh);
if (err)
return err;
}
/* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)
* we accept a checksum of zero here. When we find the socket
* for the UDP packet we'll check if that socket allows zero checksum
* for IPv6 (set by socket option).
*/
return skb_checksum_init_zero_check(skb, proto, uh->check,
ip6_compute_pseudo);
}
EXPORT_SYMBOL(udp6_csum_init);
|
