c1b1203d65
There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
#ifndef _XFRM_HASH_H
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#define _XFRM_HASH_H
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#include <linux/xfrm.h>
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#include <linux/socket.h>
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static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
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{
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return ntohl(addr->a4);
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}
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static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr)
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{
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return ntohl(addr->a6[2] ^ addr->a6[3]);
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}
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static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr)
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{
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u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
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return ntohl((__force __be32)sum);
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}
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static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr)
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{
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return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
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saddr->a6[2] ^ saddr->a6[3]);
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}
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static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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u32 reqid, unsigned short family,
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unsigned int hmask)
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{
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unsigned int h = family ^ reqid;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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return (h ^ (h >> 16)) & hmask;
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}
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static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family,
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unsigned int hmask)
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{
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unsigned int h = family;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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return (h ^ (h >> 16)) & hmask;
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}
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static inline unsigned int
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__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto,
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unsigned short family, unsigned int hmask)
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{
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unsigned int h = (__force u32)spi ^ proto;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_addr_hash(daddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_addr_hash(daddr);
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break;
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}
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return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
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}
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static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
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{
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return (index ^ (index >> 8)) & hmask;
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}
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static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
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unsigned short family, unsigned int hmask)
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{
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const xfrm_address_t *daddr = &sel->daddr;
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const xfrm_address_t *saddr = &sel->saddr;
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unsigned int h = 0;
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switch (family) {
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case AF_INET:
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if (sel->prefixlen_d != 32 ||
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sel->prefixlen_s != 32)
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return hmask + 1;
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h = __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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if (sel->prefixlen_d != 128 ||
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sel->prefixlen_s != 128)
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return hmask + 1;
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h = __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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h ^= (h >> 16);
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return h & hmask;
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}
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static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family, unsigned int hmask)
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{
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unsigned int h = 0;
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switch (family) {
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case AF_INET:
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h = __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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h = __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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h ^= (h >> 16);
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return h & hmask;
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}
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struct hlist_head *xfrm_hash_alloc(unsigned int sz);
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void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
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#endif /* _XFRM_HASH_H */
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