130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
#ifndef _XFRM_HASH_H
|
|
#define _XFRM_HASH_H
|
|
|
|
#include <linux/xfrm.h>
|
|
#include <linux/socket.h>
|
|
|
|
static inline unsigned int __xfrm4_addr_hash(xfrm_address_t *addr)
|
|
{
|
|
return ntohl(addr->a4);
|
|
}
|
|
|
|
static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
|
|
{
|
|
return ntohl(addr->a6[2] ^ addr->a6[3]);
|
|
}
|
|
|
|
static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
|
|
{
|
|
return ntohl(daddr->a4 + saddr->a4);
|
|
}
|
|
|
|
static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
|
|
{
|
|
return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
|
|
saddr->a6[2] ^ saddr->a6[3]);
|
|
}
|
|
|
|
static inline unsigned int __xfrm_dst_hash(xfrm_address_t *daddr, 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 __xfrm_src_hash(xfrm_address_t *daddr,
|
|
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(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(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
|
|
{
|
|
xfrm_address_t *daddr = &sel->daddr;
|
|
xfrm_address_t *saddr = &sel->saddr;
|
|
unsigned int h = 0;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
if (sel->prefixlen_d != 32 ||
|
|
sel->prefixlen_s != 32)
|
|
return hmask + 1;
|
|
|
|
h = __xfrm4_daddr_saddr_hash(daddr, saddr);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
if (sel->prefixlen_d != 128 ||
|
|
sel->prefixlen_s != 128)
|
|
return hmask + 1;
|
|
|
|
h = __xfrm6_daddr_saddr_hash(daddr, saddr);
|
|
break;
|
|
};
|
|
h ^= (h >> 16);
|
|
return h & hmask;
|
|
}
|
|
|
|
static inline unsigned int __addr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, unsigned int hmask)
|
|
{
|
|
unsigned int h = 0;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
h = __xfrm4_daddr_saddr_hash(daddr, saddr);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
h = __xfrm6_daddr_saddr_hash(daddr, saddr);
|
|
break;
|
|
};
|
|
h ^= (h >> 16);
|
|
return h & hmask;
|
|
}
|
|
|
|
extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
|
|
extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
|
|
|
|
#endif /* _XFRM_HASH_H */
|