[linux.git] / net / xfrm / xfrm_hash.h

#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 */
Commit	Line	Data
44e36b42 DM	1	#ifndef _XFRM_HASH_H
	2	#define _XFRM_HASH_H
	3
	4	#include <linux/xfrm.h>
	5	#include <linux/socket.h>
	6
	7	static inline unsigned int __xfrm4_addr_hash(xfrm_address_t *addr)
	8	{
	9	return ntohl(addr->a4);
	10	}
	11
	12	static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
	13	{
	14	return ntohl(addr->a6[2] ^ addr->a6[3]);
	15	}
	16
	17	static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t daddr, xfrm_address_t saddr)
	18	{
	19	return ntohl(daddr->a4 ^ saddr->a4);
	20	}
	21
	22	static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t daddr, xfrm_address_t saddr)
	23	{
	24	return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
	25	saddr->a6[2] ^ saddr->a6[3]);
	26	}
	27
	28	static inline unsigned int __xfrm_dst_hash(xfrm_address_t daddr, xfrm_address_t saddr,
	29	u32 reqid, unsigned short family,
	30	unsigned int hmask)
	31	{
	32	unsigned int h = family ^ reqid;
	33	switch (family) {
	34	case AF_INET:
	35	h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
	36	break;
	37	case AF_INET6:
	38	h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
	39	break;
	40	}
	41	return (h ^ (h >> 16)) & hmask;
	42	}
	43
667bbcb6 MN	44	static inline unsigned __xfrm_src_hash(xfrm_address_t *daddr,
667bbcb6 MN	45	xfrm_address_t *saddr,
44e36b42 DM	46	unsigned short family,
	47	unsigned int hmask)
	48	{
	49	unsigned int h = family;
	50	switch (family) {
	51	case AF_INET:
667bbcb6	52	h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
44e36b42 DM	53	break;
44e36b42 DM	54	case AF_INET6:
667bbcb6	55	h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
44e36b42 DM	56	break;
	57	};
	58	return (h ^ (h >> 16)) & hmask;
	59	}
	60
	61	static inline unsigned int
8122adf0	62	__xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family,
44e36b42 DM	63	unsigned int hmask)
44e36b42 DM	64	{
8122adf0	65	unsigned int h = (__force u32)spi ^ proto;
44e36b42 DM	66	switch (family) {
	67	case AF_INET:
	68	h ^= __xfrm4_addr_hash(daddr);
	69	break;
	70	case AF_INET6:
	71	h ^= __xfrm6_addr_hash(daddr);
	72	break;
	73	}
	74	return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
	75	}
	76
	77	static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
	78	{
	79	return (index ^ (index >> 8)) & hmask;
	80	}
	81
	82	static inline unsigned int __sel_hash(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
	83	{
	84	xfrm_address_t *daddr = &sel->daddr;
	85	xfrm_address_t *saddr = &sel->saddr;
	86	unsigned int h = 0;
	87
	88	switch (family) {
	89	case AF_INET:
	90	if (sel->prefixlen_d != 32 \|\|
	91	sel->prefixlen_s != 32)
	92	return hmask + 1;
	93
	94	h = __xfrm4_daddr_saddr_hash(daddr, saddr);
	95	break;
	96
	97	case AF_INET6:
	98	if (sel->prefixlen_d != 128 \|\|
	99	sel->prefixlen_s != 128)
	100	return hmask + 1;
	101
	102	h = __xfrm6_daddr_saddr_hash(daddr, saddr);
	103	break;
	104	};
	105	h ^= (h >> 16);
	106	return h & hmask;
	107	}
	108
	109	static inline unsigned int __addr_hash(xfrm_address_t daddr, xfrm_address_t saddr, unsigned short family, unsigned int hmask)
	110	{
	111	unsigned int h = 0;
	112
	113	switch (family) {
	114	case AF_INET:
	115	h = __xfrm4_daddr_saddr_hash(daddr, saddr);
	116	break;
	117
	118	case AF_INET6:
	119	h = __xfrm6_daddr_saddr_hash(daddr, saddr);
	120	break;
	121	};
	122	h ^= (h >> 16);
	123	return h & hmask;
	124	}
	125
	126	extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
	127	extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
	128
	129	#endif /* _XFRM_HASH_H */