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Diffstat (limited to 'net/xfrm/xfrm_hash.h')
-rw-r--r--net/xfrm/xfrm_hash.h76
1 files changed, 66 insertions, 10 deletions
diff --git a/net/xfrm/xfrm_hash.h b/net/xfrm/xfrm_hash.h
index 0622d319e1f2..666c5ffe929d 100644
--- a/net/xfrm/xfrm_hash.h
+++ b/net/xfrm/xfrm_hash.h
@@ -3,6 +3,7 @@
#include <linux/xfrm.h>
#include <linux/socket.h>
+#include <linux/jhash.h>
static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
{
@@ -28,6 +29,58 @@ static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
saddr->a6[2] ^ saddr->a6[3]);
}
+static inline u32 __bits2mask32(__u8 bits)
+{
+ u32 mask32 = 0xffffffff;
+
+ if (bits == 0)
+ mask32 = 0;
+ else if (bits < 32)
+ mask32 <<= (32 - bits);
+
+ return mask32;
+}
+
+static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr,
+ const xfrm_address_t *saddr,
+ __u8 dbits,
+ __u8 sbits)
+{
+ return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits),
+ ntohl(saddr->a4) & __bits2mask32(sbits),
+ 0);
+}
+
+static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr,
+ __u8 prefixlen)
+{
+ int pdw;
+ int pbi;
+ u32 initval = 0;
+
+ pdw = prefixlen >> 5; /* num of whole u32 in prefix */
+ pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
+
+ if (pbi) {
+ __be32 mask;
+
+ mask = htonl((0xffffffff) << (32 - pbi));
+
+ initval = (__force u32)(addr->a6[pdw] & mask);
+ }
+
+ return jhash2((__force u32 *)addr->a6, pdw, initval);
+}
+
+static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr,
+ const xfrm_address_t *saddr,
+ __u8 dbits,
+ __u8 sbits)
+{
+ return __xfrm6_pref_hash(daddr, dbits) ^
+ __xfrm6_pref_hash(saddr, sbits);
+}
+
static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
u32 reqid, unsigned short family,
@@ -84,7 +137,8 @@ static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
}
static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
- unsigned short family, unsigned int hmask)
+ unsigned short family, unsigned int hmask,
+ u8 dbits, u8 sbits)
{
const xfrm_address_t *daddr = &sel->daddr;
const xfrm_address_t *saddr = &sel->saddr;
@@ -92,19 +146,19 @@ static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
switch (family) {
case AF_INET:
- if (sel->prefixlen_d != 32 ||
- sel->prefixlen_s != 32)
+ if (sel->prefixlen_d < dbits ||
+ sel->prefixlen_s < sbits)
return hmask + 1;
- h = __xfrm4_daddr_saddr_hash(daddr, saddr);
+ h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
case AF_INET6:
- if (sel->prefixlen_d != 128 ||
- sel->prefixlen_s != 128)
+ if (sel->prefixlen_d < dbits ||
+ sel->prefixlen_s < sbits)
return hmask + 1;
- h = __xfrm6_daddr_saddr_hash(daddr, saddr);
+ h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
}
h ^= (h >> 16);
@@ -113,17 +167,19 @@ static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
- unsigned short family, unsigned int hmask)
+ unsigned short family,
+ unsigned int hmask,
+ u8 dbits, u8 sbits)
{
unsigned int h = 0;
switch (family) {
case AF_INET:
- h = __xfrm4_daddr_saddr_hash(daddr, saddr);
+ h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
case AF_INET6:
- h = __xfrm6_daddr_saddr_hash(daddr, saddr);
+ h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
}
h ^= (h >> 16);