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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
#ifndef _XFRM_HASH_H
#define _XFRM_HASH_H
#include <linux/xfrm.h>
#include <linux/socket.h>
static inline unsigned int __xfrm4_addr_hash(xfrm_address_t *addr)
{
return ntohl(addr->a4);
}
static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
{
return ntohl(addr->a6[2] ^ addr->a6[3]);
}
static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
{
return ntohl(daddr->a4 ^ saddr->a4);
}
static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
{
return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
saddr->a6[2] ^ saddr->a6[3]);
}
static inline unsigned int __xfrm_dst_hash(xfrm_address_t *daddr, xfrm_address_t *saddr,
u32 reqid, unsigned short family,
unsigned int hmask)
{
unsigned int h = family ^ reqid;
switch (family) {
case AF_INET:
h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
break;
case AF_INET6:
h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
break;
}
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned __xfrm_src_hash(xfrm_address_t *saddr,
unsigned short family,
unsigned int hmask)
{
unsigned int h = family;
switch (family) {
case AF_INET:
h ^= __xfrm4_addr_hash(saddr);
break;
case AF_INET6:
h ^= __xfrm6_addr_hash(saddr);
break;
};
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned int
__xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family,
unsigned int hmask)
{
unsigned int h = spi ^ proto;
switch (family) {
case AF_INET:
h ^= __xfrm4_addr_hash(daddr);
break;
case AF_INET6:
h ^= __xfrm6_addr_hash(daddr);
break;
}
return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
}
static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
{
return (index ^ (index >> 8)) & hmask;
}
static inline unsigned int __sel_hash(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
{
xfrm_address_t *daddr = &sel->daddr;
xfrm_address_t *saddr = &sel->saddr;
unsigned int h = 0;
switch (family) {
case AF_INET:
if (sel->prefixlen_d != 32 ||
sel->prefixlen_s != 32)
return hmask + 1;
h = __xfrm4_daddr_saddr_hash(daddr, saddr);
break;
case AF_INET6:
if (sel->prefixlen_d != 128 ||
sel->prefixlen_s != 128)
return hmask + 1;
h = __xfrm6_daddr_saddr_hash(daddr, saddr);
break;
};
h ^= (h >> 16);
return h & hmask;
}
static inline unsigned int __addr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, unsigned int hmask)
{
unsigned int h = 0;
switch (family) {
case AF_INET:
h = __xfrm4_daddr_saddr_hash(daddr, saddr);
break;
case AF_INET6:
h = __xfrm6_daddr_saddr_hash(daddr, saddr);
break;
};
h ^= (h >> 16);
return h & hmask;
}
extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
#endif /* _XFRM_HASH_H */
|
