~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/xfrm/xfrm_hash.h

Version: ~ [ linux-5.12 ] ~ [ linux-5.11.16 ] ~ [ linux-5.10.32 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.114 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.188 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.231 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.267 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.267 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #ifndef _XFRM_HASH_H
  2 #define _XFRM_HASH_H
  3 
  4 #include <linux/xfrm.h>
  5 #include <linux/socket.h>
  6 #include <linux/jhash.h>
  7 
  8 static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
  9 {
 10         return ntohl(addr->a4);
 11 }
 12 
 13 static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr)
 14 {
 15         return ntohl(addr->a6[2] ^ addr->a6[3]);
 16 }
 17 
 18 static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr,
 19                                                     const xfrm_address_t *saddr)
 20 {
 21         u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
 22         return ntohl((__force __be32)sum);
 23 }
 24 
 25 static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
 26                                                     const xfrm_address_t *saddr)
 27 {
 28         return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
 29                      saddr->a6[2] ^ saddr->a6[3]);
 30 }
 31 
 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         unsigned int pdw;
 58         unsigned 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 
 84 static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr,
 85                                            const xfrm_address_t *saddr,
 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 
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)
105 {
106         unsigned int h = family;
107         switch (family) {
108         case AF_INET:
109                 h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
110                 break;
111         case AF_INET6:
112                 h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
113                 break;
114         }
115         return (h ^ (h >> 16)) & hmask;
116 }
117 
118 static inline unsigned int
119 __xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto,
120                 unsigned short family, unsigned int hmask)
121 {
122         unsigned int h = (__force u32)spi ^ proto;
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 
139 static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
140                                       unsigned short family, unsigned int hmask,
141                                       u8 dbits, u8 sbits)
142 {
143         const xfrm_address_t *daddr = &sel->daddr;
144         const xfrm_address_t *saddr = &sel->saddr;
145         unsigned int h = 0;
146 
147         switch (family) {
148         case AF_INET:
149                 if (sel->prefixlen_d < dbits ||
150                     sel->prefixlen_s < sbits)
151                         return hmask + 1;
152 
153                 h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
154                 break;
155 
156         case AF_INET6:
157                 if (sel->prefixlen_d < dbits ||
158                     sel->prefixlen_s < sbits)
159                         return hmask + 1;
160 
161                 h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
162                 break;
163         }
164         h ^= (h >> 16);
165         return h & hmask;
166 }
167 
168 static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
169                                        const xfrm_address_t *saddr,
170                                        unsigned short family,
171                                        unsigned int hmask,
172                                        u8 dbits, u8 sbits)
173 {
174         unsigned int h = 0;
175 
176         switch (family) {
177         case AF_INET:
178                 h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
179                 break;
180 
181         case AF_INET6:
182                 h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
183                 break;
184         }
185         h ^= (h >> 16);
186         return h & hmask;
187 }
188 
189 struct hlist_head *xfrm_hash_alloc(unsigned int sz);
190 void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
191 
192 #endif /* _XFRM_HASH_H */
193 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp