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	u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
20	return ntohl((__force __be32)sum);
21}
22
23static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
24{
25	return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
26		     saddr->a6[2] ^ saddr->a6[3]);
27}
28
29static inline unsigned int __xfrm_dst_hash(xfrm_address_t *daddr, xfrm_address_t *saddr,
30					   u32 reqid, unsigned short family,
31					   unsigned int hmask)
32{
33	unsigned int h = family ^ reqid;
34	switch (family) {
35	case AF_INET:
36		h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
37		break;
38	case AF_INET6:
39		h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
40		break;
41	}
42	return (h ^ (h >> 16)) & hmask;
43}
44
45static inline unsigned __xfrm_src_hash(xfrm_address_t *daddr,
46				       xfrm_address_t *saddr,
47				       unsigned short family,
48				       unsigned int hmask)
49{
50	unsigned int h = family;
51	switch (family) {
52	case AF_INET:
53		h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
54		break;
55	case AF_INET6:
56		h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
57		break;
58	}
59	return (h ^ (h >> 16)) & hmask;
60}
61
62static inline unsigned int
63__xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family,
64		unsigned int hmask)
65{
66	unsigned int h = (__force u32)spi ^ proto;
67	switch (family) {
68	case AF_INET:
69		h ^= __xfrm4_addr_hash(daddr);
70		break;
71	case AF_INET6:
72		h ^= __xfrm6_addr_hash(daddr);
73		break;
74	}
75	return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
76}
77
78static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
79{
80	return (index ^ (index >> 8)) & hmask;
81}
82
83static inline unsigned int __sel_hash(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
84{
85	xfrm_address_t *daddr = &sel->daddr;
86	xfrm_address_t *saddr = &sel->saddr;
87	unsigned int h = 0;
88
89	switch (family) {
90	case AF_INET:
91		if (sel->prefixlen_d != 32 ||
92		    sel->prefixlen_s != 32)
93			return hmask + 1;
94
95		h = __xfrm4_daddr_saddr_hash(daddr, saddr);
96		break;
97
98	case AF_INET6:
99		if (sel->prefixlen_d != 128 ||
100		    sel->prefixlen_s != 128)
101			return hmask + 1;
102
103		h = __xfrm6_daddr_saddr_hash(daddr, saddr);
104		break;
105	}
106	h ^= (h >> 16);
107	return h & hmask;
108}
109
110static inline unsigned int __addr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, unsigned int hmask)
111{
112	unsigned int h = 0;
113
114	switch (family) {
115	case AF_INET:
116		h = __xfrm4_daddr_saddr_hash(daddr, saddr);
117		break;
118
119	case AF_INET6:
120		h = __xfrm6_daddr_saddr_hash(daddr, saddr);
121		break;
122	}
123	h ^= (h >> 16);
124	return h & hmask;
125}
126
127extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
128extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
129
130#endif /* _XFRM_HASH_H */
131