1 #ifndef _XFRM_HASH_H 2 #define _XFRM_HASH_H 3 4 #include <linux/xfrm.h> 5 #include <linux/socket.h> 6 7 static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr) 8 { 9 return ntohl(addr->a4); 10 } 11 12 static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr) 13 { 14 return ntohl(addr->a6[2] ^ addr->a6[3]); 15 } 16 17 static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr, 18 const xfrm_address_t *saddr) 19 { 20 u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4; 21 return ntohl((__force __be32)sum); 22 } 23 24 static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr, 25 const xfrm_address_t *saddr) 26 { 27 return ntohl(daddr->a6[2] ^ daddr->a6[3] ^ 28 saddr->a6[2] ^ saddr->a6[3]); 29 } 30 31 static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr, 32 const xfrm_address_t *saddr, 33 u32 reqid, unsigned short family, 34 unsigned int hmask) 35 { 36 unsigned int h = family ^ reqid; 37 switch (family) { 38 case AF_INET: 39 h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); 40 break; 41 case AF_INET6: 42 h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); 43 break; 44 } 45 return (h ^ (h >> 16)) & hmask; 46 } 47 48 static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr, 49 const xfrm_address_t *saddr, 50 unsigned short family, 51 unsigned int hmask) 52 { 53 unsigned int h = family; 54 switch (family) { 55 case AF_INET: 56 h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); 57 break; 58 case AF_INET6: 59 h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); 60 break; 61 } 62 return (h ^ (h >> 16)) & hmask; 63 } 64 65 static inline unsigned int 66 __xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto, 67 unsigned short family, unsigned int hmask) 68 { 69 unsigned int h = (__force u32)spi ^ proto; 70 switch (family) { 71 case AF_INET: 72 h ^= __xfrm4_addr_hash(daddr); 73 break; 74 case AF_INET6: 75 h ^= __xfrm6_addr_hash(daddr); 76 break; 77 } 78 return (h ^ (h >> 10) ^ (h >> 20)) & hmask; 79 } 80 81 static inline unsigned int __idx_hash(u32 index, unsigned int hmask) 82 { 83 return (index ^ (index >> 8)) & hmask; 84 } 85 86 static inline unsigned int __sel_hash(const struct xfrm_selector *sel, 87 unsigned short family, unsigned int hmask) 88 { 89 const xfrm_address_t *daddr = &sel->daddr; 90 const xfrm_address_t *saddr = &sel->saddr; 91 unsigned int h = 0; 92 93 switch (family) { 94 case AF_INET: 95 if (sel->prefixlen_d != 32 || 96 sel->prefixlen_s != 32) 97 return hmask + 1; 98 99 h = __xfrm4_daddr_saddr_hash(daddr, saddr); 100 break; 101 102 case AF_INET6: 103 if (sel->prefixlen_d != 128 || 104 sel->prefixlen_s != 128) 105 return hmask + 1; 106 107 h = __xfrm6_daddr_saddr_hash(daddr, saddr); 108 break; 109 } 110 h ^= (h >> 16); 111 return h & hmask; 112 } 113 114 static inline unsigned int __addr_hash(const xfrm_address_t *daddr, 115 const xfrm_address_t *saddr, 116 unsigned short family, unsigned int hmask) 117 { 118 unsigned int h = 0; 119 120 switch (family) { 121 case AF_INET: 122 h = __xfrm4_daddr_saddr_hash(daddr, saddr); 123 break; 124 125 case AF_INET6: 126 h = __xfrm6_daddr_saddr_hash(daddr, saddr); 127 break; 128 } 129 h ^= (h >> 16); 130 return h & hmask; 131 } 132 133 extern struct hlist_head *xfrm_hash_alloc(unsigned int sz); 134 extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz); 135 136 #endif /* _XFRM_HASH_H */ 137