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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _XFRM_HASH_H
#define _XFRM_HASH_H
#include <linux/xfrm.h>
#include <linux/socket.h>
#include <linux/jhash.h>
static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
{
return ntohl(addr->a4);
}
static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr)
{
return ntohl(addr->a6[2] ^ addr->a6[3]);
}
static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr)
{
u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
return ntohl((__force __be32)sum);
}
static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr)
{
return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
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)
{
unsigned int pdw;
unsigned 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,
unsigned int hmask)
{
unsigned int h = family ^ reqid;
switch (family) {
case AF_INET:
h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
break;
case AF_INET6:
h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
break;
}
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
unsigned short family,
unsigned int hmask)
{
unsigned int h = family;
switch (family) {
case AF_INET:
h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
break;
case AF_INET6:
h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
break;
}
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned int
__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto,
unsigned short family, unsigned int hmask)
{
unsigned int h = (__force u32)spi ^ proto;
switch (family) {
case AF_INET:
h ^= __xfrm4_addr_hash(daddr);
break;
case AF_INET6:
h ^= __xfrm6_addr_hash(daddr);
break;
}
return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
}
static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
{
return (index ^ (index >> 8)) & hmask;
}
static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
unsigned short family, unsigned int hmask,
u8 dbits, u8 sbits)
{
const xfrm_address_t *daddr = &sel->daddr;
const xfrm_address_t *saddr = &sel->saddr;
unsigned int h = 0;
switch (family) {
case AF_INET:
if (sel->prefixlen_d < dbits ||
sel->prefixlen_s < sbits)
return hmask + 1;
h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
case AF_INET6:
if (sel->prefixlen_d < dbits ||
sel->prefixlen_s < sbits)
return hmask + 1;
h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
}
h ^= (h >> 16);
return h & hmask;
}
static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
unsigned short family,
unsigned int hmask,
u8 dbits, u8 sbits)
{
unsigned int h = 0;
switch (family) {
case AF_INET:
h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
case AF_INET6:
h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
break;
}
h ^= (h >> 16);
return h & hmask;
}
struct hlist_head *xfrm_hash_alloc(unsigned int sz);
void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
#endif /* _XFRM_HASH_H */
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