root/net/xfrm/xfrm_hash.h

INCLUDED FROM

DEFINITIONS

1. __xfrm4_addr_hash
2. __xfrm6_addr_hash
3. __xfrm4_daddr_saddr_hash
4. __xfrm6_daddr_saddr_hash
5. __xfrm_dst_hash
6. __xfrm_src_hash
7. __xfrm_spi_hash
8. __idx_hash
9. __sel_hash
10. __addr_hash

#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 */