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44e36b42 DM |
1 | #ifndef _XFRM_HASH_H |
2 | #define _XFRM_HASH_H | |
3 | ||
4 | #include <linux/xfrm.h> | |
5 | #include <linux/socket.h> | |
b58555f1 | 6 | #include <linux/jhash.h> |
44e36b42 | 7 | |
5f803b58 | 8 | static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr) |
44e36b42 DM |
9 | { |
10 | return ntohl(addr->a4); | |
11 | } | |
12 | ||
5f803b58 | 13 | static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr) |
44e36b42 DM |
14 | { |
15 | return ntohl(addr->a6[2] ^ addr->a6[3]); | |
16 | } | |
17 | ||
5f803b58 DM |
18 | static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr, |
19 | const xfrm_address_t *saddr) | |
44e36b42 | 20 | { |
0eae88f3 ED |
21 | u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4; |
22 | return ntohl((__force __be32)sum); | |
44e36b42 DM |
23 | } |
24 | ||
5f803b58 DM |
25 | static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr, |
26 | const xfrm_address_t *saddr) | |
44e36b42 DM |
27 | { |
28 | return ntohl(daddr->a6[2] ^ daddr->a6[3] ^ | |
29 | saddr->a6[2] ^ saddr->a6[3]); | |
30 | } | |
31 | ||
b58555f1 CG |
32 | static inline u32 __bits2mask32(__u8 bits) |
33 | { | |
34 | u32 mask32 = 0xffffffff; | |
35 | ||
36 | if (bits == 0) | |
37 | mask32 = 0; | |
38 | else if (bits < 32) | |
39 | mask32 <<= (32 - bits); | |
40 | ||
41 | return mask32; | |
42 | } | |
43 | ||
44 | static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr, | |
45 | const xfrm_address_t *saddr, | |
46 | __u8 dbits, | |
47 | __u8 sbits) | |
48 | { | |
49 | return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits), | |
50 | ntohl(saddr->a4) & __bits2mask32(sbits), | |
51 | 0); | |
52 | } | |
53 | ||
54 | static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr, | |
55 | __u8 prefixlen) | |
56 | { | |
57 | int pdw; | |
58 | int pbi; | |
59 | u32 initval = 0; | |
60 | ||
61 | pdw = prefixlen >> 5; /* num of whole u32 in prefix */ | |
62 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
63 | ||
64 | if (pbi) { | |
65 | __be32 mask; | |
66 | ||
67 | mask = htonl((0xffffffff) << (32 - pbi)); | |
68 | ||
69 | initval = (__force u32)(addr->a6[pdw] & mask); | |
70 | } | |
71 | ||
72 | return jhash2((__force u32 *)addr->a6, pdw, initval); | |
73 | } | |
74 | ||
75 | static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr, | |
76 | const xfrm_address_t *saddr, | |
77 | __u8 dbits, | |
78 | __u8 sbits) | |
79 | { | |
80 | return __xfrm6_pref_hash(daddr, dbits) ^ | |
81 | __xfrm6_pref_hash(saddr, sbits); | |
82 | } | |
83 | ||
5f803b58 DM |
84 | static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr, |
85 | const xfrm_address_t *saddr, | |
44e36b42 DM |
86 | u32 reqid, unsigned short family, |
87 | unsigned int hmask) | |
88 | { | |
89 | unsigned int h = family ^ reqid; | |
90 | switch (family) { | |
91 | case AF_INET: | |
92 | h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); | |
93 | break; | |
94 | case AF_INET6: | |
95 | h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); | |
96 | break; | |
97 | } | |
98 | return (h ^ (h >> 16)) & hmask; | |
99 | } | |
100 | ||
95c96174 ED |
101 | static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr, |
102 | const xfrm_address_t *saddr, | |
103 | unsigned short family, | |
104 | unsigned int hmask) | |
44e36b42 DM |
105 | { |
106 | unsigned int h = family; | |
107 | switch (family) { | |
108 | case AF_INET: | |
667bbcb6 | 109 | h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); |
44e36b42 DM |
110 | break; |
111 | case AF_INET6: | |
667bbcb6 | 112 | h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); |
44e36b42 | 113 | break; |
ccbd6a5a | 114 | } |
44e36b42 DM |
115 | return (h ^ (h >> 16)) & hmask; |
116 | } | |
117 | ||
118 | static inline unsigned int | |
5f803b58 DM |
119 | __xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto, |
120 | unsigned short family, unsigned int hmask) | |
44e36b42 | 121 | { |
8122adf0 | 122 | unsigned int h = (__force u32)spi ^ proto; |
44e36b42 DM |
123 | switch (family) { |
124 | case AF_INET: | |
125 | h ^= __xfrm4_addr_hash(daddr); | |
126 | break; | |
127 | case AF_INET6: | |
128 | h ^= __xfrm6_addr_hash(daddr); | |
129 | break; | |
130 | } | |
131 | return (h ^ (h >> 10) ^ (h >> 20)) & hmask; | |
132 | } | |
133 | ||
134 | static inline unsigned int __idx_hash(u32 index, unsigned int hmask) | |
135 | { | |
136 | return (index ^ (index >> 8)) & hmask; | |
137 | } | |
138 | ||
5f803b58 | 139 | static inline unsigned int __sel_hash(const struct xfrm_selector *sel, |
b58555f1 CG |
140 | unsigned short family, unsigned int hmask, |
141 | u8 dbits, u8 sbits) | |
44e36b42 | 142 | { |
5f803b58 DM |
143 | const xfrm_address_t *daddr = &sel->daddr; |
144 | const xfrm_address_t *saddr = &sel->saddr; | |
44e36b42 DM |
145 | unsigned int h = 0; |
146 | ||
147 | switch (family) { | |
148 | case AF_INET: | |
b58555f1 CG |
149 | if (sel->prefixlen_d < dbits || |
150 | sel->prefixlen_s < sbits) | |
44e36b42 DM |
151 | return hmask + 1; |
152 | ||
b58555f1 | 153 | h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); |
44e36b42 DM |
154 | break; |
155 | ||
156 | case AF_INET6: | |
b58555f1 CG |
157 | if (sel->prefixlen_d < dbits || |
158 | sel->prefixlen_s < sbits) | |
44e36b42 DM |
159 | return hmask + 1; |
160 | ||
b58555f1 | 161 | h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); |
44e36b42 | 162 | break; |
ccbd6a5a | 163 | } |
44e36b42 DM |
164 | h ^= (h >> 16); |
165 | return h & hmask; | |
166 | } | |
167 | ||
5f803b58 DM |
168 | static inline unsigned int __addr_hash(const xfrm_address_t *daddr, |
169 | const xfrm_address_t *saddr, | |
b58555f1 CG |
170 | unsigned short family, |
171 | unsigned int hmask, | |
172 | u8 dbits, u8 sbits) | |
44e36b42 DM |
173 | { |
174 | unsigned int h = 0; | |
175 | ||
176 | switch (family) { | |
177 | case AF_INET: | |
b58555f1 | 178 | h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); |
44e36b42 DM |
179 | break; |
180 | ||
181 | case AF_INET6: | |
b58555f1 | 182 | h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); |
44e36b42 | 183 | break; |
ccbd6a5a | 184 | } |
44e36b42 DM |
185 | h ^= (h >> 16); |
186 | return h & hmask; | |
187 | } | |
188 | ||
c1b1203d JP |
189 | struct hlist_head *xfrm_hash_alloc(unsigned int sz); |
190 | void xfrm_hash_free(struct hlist_head *n, unsigned int sz); | |
44e36b42 DM |
191 | |
192 | #endif /* _XFRM_HASH_H */ |