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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / 44e36b42a8378be1dcf7e6f8a1cb2710a8903387 / . / net / xfrm / xfrm_hash.h
blob: d3abb0b7dc62190259c941fb28cdfc068d32c1df [file] [log] [blame]
David S. Miller44e36b42006-08-24 04:50:50 -0700[diff] [blame^]1#ifndef _XFRM_HASH_H
2#define _XFRM_HASH_H
3
4#include <linux/xfrm.h>
5#include <linux/socket.h>
6
7static inline unsigned int __xfrm4_addr_hash(xfrm_address_t *addr)
8{
9 return ntohl(addr->a4);
10}
11
12static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
13{
14 return ntohl(addr->a6[2] ^ addr->a6[3]);
15}
16
17static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
18{
19 return ntohl(daddr->a4 ^ saddr->a4);
20}
21
22static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
23{
24 return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
25 saddr->a6[2] ^ saddr->a6[3]);
26}
27
28static inline unsigned int __xfrm_dst_hash(xfrm_address_t *daddr, xfrm_address_t *saddr,
29 u32 reqid, unsigned short family,
30 unsigned int hmask)
31{
32 unsigned int h = family ^ reqid;
33 switch (family) {
34 case AF_INET:
35 h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
36 break;
37 case AF_INET6:
38 h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
39 break;
40 }
41 return (h ^ (h >> 16)) & hmask;
42}
43
44static inline unsigned __xfrm_src_hash(xfrm_address_t *saddr,
45 unsigned short family,
46 unsigned int hmask)
47{
48 unsigned int h = family;
49 switch (family) {
50 case AF_INET:
51 h ^= __xfrm4_addr_hash(saddr);
52 break;
53 case AF_INET6:
54 h ^= __xfrm6_addr_hash(saddr);
55 break;
56 };
57 return (h ^ (h >> 16)) & hmask;
58}
59
60static inline unsigned int
61__xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family,
62 unsigned int hmask)
63{
64 unsigned int h = spi ^ proto;
65 switch (family) {
66 case AF_INET:
67 h ^= __xfrm4_addr_hash(daddr);
68 break;
69 case AF_INET6:
70 h ^= __xfrm6_addr_hash(daddr);
71 break;
72 }
73 return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
74}
75
76static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
77{
78 return (index ^ (index >> 8)) & hmask;
79}
80
81static inline unsigned int __sel_hash(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
82{
83 xfrm_address_t *daddr = &sel->daddr;
84 xfrm_address_t *saddr = &sel->saddr;
85 unsigned int h = 0;
86
87 switch (family) {
88 case AF_INET:
89 if (sel->prefixlen_d != 32 ||
90 sel->prefixlen_s != 32)
91 return hmask + 1;
92
93 h = __xfrm4_daddr_saddr_hash(daddr, saddr);
94 break;
95
96 case AF_INET6:
97 if (sel->prefixlen_d != 128 ||
98 sel->prefixlen_s != 128)
99 return hmask + 1;
100
101 h = __xfrm6_daddr_saddr_hash(daddr, saddr);
102 break;
103 };
104 h ^= (h >> 16);
105 return h & hmask;
106}
107
108static inline unsigned int __addr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, unsigned int hmask)
109{
110 unsigned int h = 0;
111
112 switch (family) {
113 case AF_INET:
114 h = __xfrm4_daddr_saddr_hash(daddr, saddr);
115 break;
116
117 case AF_INET6:
118 h = __xfrm6_daddr_saddr_hash(daddr, saddr);
119 break;
120 };
121 h ^= (h >> 16);
122 return h & hmask;
123}
124
125extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
126extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
127
128#endif /* _XFRM_HASH_H */