[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)
{
	u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
	return ntohl((__force __be32)sum);
}

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	{
0eae88f3 ED	19	u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
0eae88f3 ED	20	return ntohl((__force __be32)sum);
44e36b42 DM	21	}
	22
	23	static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t daddr, xfrm_address_t saddr)
	24	{
	25	return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
	26	saddr->a6[2] ^ saddr->a6[3]);
	27	}
	28
	29	static inline unsigned int __xfrm_dst_hash(xfrm_address_t daddr, xfrm_address_t saddr,
	30	u32 reqid, unsigned short family,
	31	unsigned int hmask)
	32	{
	33	unsigned int h = family ^ reqid;
	34	switch (family) {
	35	case AF_INET:
	36	h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
	37	break;
	38	case AF_INET6:
	39	h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
	40	break;
	41	}
	42	return (h ^ (h >> 16)) & hmask;
	43	}
	44
667bbcb6 MN	45	static inline unsigned __xfrm_src_hash(xfrm_address_t *daddr,
667bbcb6 MN	46	xfrm_address_t *saddr,
44e36b42 DM	47	unsigned short family,
	48	unsigned int hmask)
	49	{
	50	unsigned int h = family;
	51	switch (family) {
	52	case AF_INET:
667bbcb6	53	h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
44e36b42 DM	54	break;
44e36b42 DM	55	case AF_INET6:
667bbcb6	56	h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
44e36b42	57	break;
ccbd6a5a	58	}
44e36b42 DM	59	return (h ^ (h >> 16)) & hmask;
	60	}
	61
	62	static inline unsigned int
8122adf0	63	__xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family,
44e36b42 DM	64	unsigned int hmask)
44e36b42 DM	65	{
8122adf0	66	unsigned int h = (__force u32)spi ^ proto;
44e36b42 DM	67	switch (family) {
	68	case AF_INET:
	69	h ^= __xfrm4_addr_hash(daddr);
	70	break;
	71	case AF_INET6:
	72	h ^= __xfrm6_addr_hash(daddr);
	73	break;
	74	}
	75	return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
	76	}
	77
	78	static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
	79	{
	80	return (index ^ (index >> 8)) & hmask;
	81	}
	82
	83	static inline unsigned int __sel_hash(struct xfrm_selector *sel, unsigned short family, unsigned int hmask)
	84	{
	85	xfrm_address_t *daddr = &sel->daddr;
	86	xfrm_address_t *saddr = &sel->saddr;
	87	unsigned int h = 0;
	88
	89	switch (family) {
	90	case AF_INET:
	91	if (sel->prefixlen_d != 32 \|\|
	92	sel->prefixlen_s != 32)
	93	return hmask + 1;
	94
	95	h = __xfrm4_daddr_saddr_hash(daddr, saddr);
	96	break;
	97
	98	case AF_INET6:
	99	if (sel->prefixlen_d != 128 \|\|
	100	sel->prefixlen_s != 128)
	101	return hmask + 1;
	102
	103	h = __xfrm6_daddr_saddr_hash(daddr, saddr);
	104	break;
ccbd6a5a	105	}
44e36b42 DM	106	h ^= (h >> 16);
	107	return h & hmask;
	108	}
	109
	110	static inline unsigned int __addr_hash(xfrm_address_t daddr, xfrm_address_t saddr, unsigned short family, unsigned int hmask)
	111	{
	112	unsigned int h = 0;
	113
	114	switch (family) {
	115	case AF_INET:
	116	h = __xfrm4_daddr_saddr_hash(daddr, saddr);
	117	break;
	118
	119	case AF_INET6:
	120	h = __xfrm6_daddr_saddr_hash(daddr, saddr);
	121	break;
ccbd6a5a	122	}
44e36b42 DM	123	h ^= (h >> 16);
	124	return h & hmask;
	125	}
	126
	127	extern struct hlist_head *xfrm_hash_alloc(unsigned int sz);
	128	extern void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
	129
	130	#endif /* _XFRM_HASH_H */