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[XFRM]: Extract common hashing code into xfrm_hash.[ch] 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-08-24 04:50:50 -07:00
parent 2518c7c2b3
commit 44e36b42a8
5 changed files with 195 additions and 200 deletions
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3
net/xfrm/Makefile
View File

@ -2,6 +2,7 @@
# Makefile for the XFRM subsystem.
#
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_input.o xfrm_algo.o
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
xfrm_input.o xfrm_algo.o
obj-$(CONFIG_XFRM_USER) += xfrm_user.o

41
net/xfrm/xfrm_hash.c Normal file
View File

@ -0,0 +1,41 @@
/* xfrm_hash.c: Common hash table code.
*
* Copyright (C) 2006 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/xfrm.h>
#include "xfrm_hash.h"
struct hlist_head *xfrm_hash_alloc(unsigned int sz)
{
struct hlist_head *n;
if (sz <= PAGE_SIZE)
n = kmalloc(sz, GFP_KERNEL);
else if (hashdist)
n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
else
n = (struct hlist_head *)
__get_free_pages(GFP_KERNEL, get_order(sz));
if (n)
memset(n, 0, sz);
return n;
}
void xfrm_hash_free(struct hlist_head *n, unsigned int sz)
{
if (sz <= PAGE_SIZE)
kfree(n);
else if (hashdist)
vfree(n);
else
free_pages((unsigned long)n, get_order(sz));
}

128
net/xfrm/xfrm_hash.h Normal file
View File

@ -0,0 +1,128 @@
#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 *saddr,
unsigned short family,
unsigned int hmask)
{
unsigned int h = family;
switch (family) {
case AF_INET:
h ^= __xfrm4_addr_hash(saddr);
break;
case AF_INET6:
h ^= __xfrm6_addr_hash(saddr);
break;
};
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned int
__xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family,
unsigned int hmask)
{
unsigned int h = 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 */

95
net/xfrm/xfrm_policy.c
View File

@ -22,12 +22,12 @@
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/vmalloc.h>
#include <linux/cache.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include "xfrm_hash.h"
DEFINE_MUTEX(xfrm_cfg_mutex);
EXPORT_SYMBOL(xfrm_cfg_mutex);
@ -409,62 +409,11 @@ static struct hlist_head *xfrm_policy_byidx __read_mostly;
static unsigned int xfrm_idx_hmask __read_mostly;
static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
{
return (index ^ (index >> 8)) & hmask;
}
static inline unsigned int idx_hash(u32 index)
{
return __idx_hash(index, xfrm_idx_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 = ntohl(daddr->a4 ^ saddr->a4);
break;
case AF_INET6:
if (sel->prefixlen_d != 128 ||
sel->prefixlen_s != 128)
return hmask + 1;
h = ntohl(daddr->a6[2] ^ daddr->a6[3] ^
saddr->a6[2] ^ saddr->a6[3]);
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 = ntohl(daddr->a4 ^ saddr->a4);
break;
case AF_INET6:
h = ntohl(daddr->a6[2] ^ daddr->a6[3] ^
saddr->a6[2] ^ saddr->a6[3]);
break;
};
h ^= (h >> 16);
return h & hmask;
}
static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
{
unsigned int hmask = xfrm_policy_bydst[dir].hmask;
@ -483,34 +432,6 @@ static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address
return xfrm_policy_bydst[dir].table + hash;
}
static struct hlist_head *xfrm_policy_hash_alloc(unsigned int sz)
{
struct hlist_head *n;
if (sz <= PAGE_SIZE)
n = kmalloc(sz, GFP_KERNEL);
else if (hashdist)
n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
else
n = (struct hlist_head *)
__get_free_pages(GFP_KERNEL, get_order(sz));
if (n)
memset(n, 0, sz);
return n;
}
static void xfrm_policy_hash_free(struct hlist_head *n, unsigned int sz)
{
if (sz <= PAGE_SIZE)
kfree(n);
else if (hashdist)
vfree(n);
else
free_pages((unsigned long)n, get_order(sz));
}
static void xfrm_dst_hash_transfer(struct hlist_head *list,
struct hlist_head *ndsttable,
unsigned int nhashmask)
@ -553,7 +474,7 @@ static void xfrm_bydst_resize(int dir)
unsigned int nhashmask = xfrm_new_hash_mask(hmask);
unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
struct hlist_head *odst = xfrm_policy_bydst[dir].table;
struct hlist_head *ndst = xfrm_policy_hash_alloc(nsize);
struct hlist_head *ndst = xfrm_hash_alloc(nsize);
int i;
if (!ndst)
@ -569,7 +490,7 @@ static void xfrm_bydst_resize(int dir)
write_unlock_bh(&xfrm_policy_lock);
xfrm_policy_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
}
static void xfrm_byidx_resize(int total)
@ -578,7 +499,7 @@ static void xfrm_byidx_resize(int total)
unsigned int nhashmask = xfrm_new_hash_mask(hmask);
unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
struct hlist_head *oidx = xfrm_policy_byidx;
struct hlist_head *nidx = xfrm_policy_hash_alloc(nsize);
struct hlist_head *nidx = xfrm_hash_alloc(nsize);
int i;
if (!nidx)
@ -594,7 +515,7 @@ static void xfrm_byidx_resize(int total)
write_unlock_bh(&xfrm_policy_lock);
xfrm_policy_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
}
static inline int xfrm_bydst_should_resize(int dir, int *total)
@ -2071,7 +1992,7 @@ static void __init xfrm_policy_init(void)
hmask = 8 - 1;
sz = (hmask+1) * sizeof(struct hlist_head);
xfrm_policy_byidx = xfrm_policy_hash_alloc(sz);
xfrm_policy_byidx = xfrm_hash_alloc(sz);
xfrm_idx_hmask = hmask;
if (!xfrm_policy_byidx)
panic("XFRM: failed to allocate byidx hash\n");
@ -2082,7 +2003,7 @@ static void __init xfrm_policy_init(void)
INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
htab = &xfrm_policy_bydst[dir];
htab->table = xfrm_policy_hash_alloc(sz);
htab->table = xfrm_hash_alloc(sz);
htab->hmask = hmask;
if (!htab->table)
panic("XFRM: failed to allocate bydst hash\n");

128
net/xfrm/xfrm_state.c
View File

@ -18,11 +18,11 @@
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/vmalloc.h>
#include <linux/cache.h>
#include <asm/uaccess.h>
#include "xfrm_hash.h"
struct sock *xfrm_nl;
EXPORT_SYMBOL(xfrm_nl);
@ -55,44 +55,6 @@ static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;
static unsigned int xfrm_state_genid;
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 int xfrm_dst_hash(xfrm_address_t *daddr,
xfrm_address_t *saddr,
u32 reqid,
@ -101,76 +63,18 @@ static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask);
}
static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family,
unsigned int hmask)
{
unsigned int h = family;
switch (family) {
case AF_INET:
h ^= __xfrm4_addr_hash(addr);
break;
case AF_INET6:
h ^= __xfrm6_addr_hash(addr);
break;
};
return (h ^ (h >> 16)) & hmask;
}
static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
static inline unsigned int xfrm_src_hash(xfrm_address_t *addr,
unsigned short family)
{
return __xfrm_src_hash(addr, family, xfrm_state_hmask);
}
static inline unsigned int
__xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto,
unsigned short family, unsigned int hmask)
{
unsigned int h = 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
xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family)
{
return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask);
}
static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz)
{
struct hlist_head *n;
if (sz <= PAGE_SIZE)
n = kmalloc(sz, GFP_KERNEL);
else if (hashdist)
n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
else
n = (struct hlist_head *)
__get_free_pages(GFP_KERNEL, get_order(sz));
if (n)
memset(n, 0, sz);
return n;
}
static void xfrm_state_hash_free(struct hlist_head *n, unsigned int sz)
{
if (sz <= PAGE_SIZE)
kfree(n);
else if (hashdist)
vfree(n);
else
free_pages((unsigned long)n, get_order(sz));
}
static void xfrm_hash_transfer(struct hlist_head *list,
struct hlist_head *ndsttable,
struct hlist_head *nsrctable,
@ -216,18 +120,18 @@ static void xfrm_hash_resize(void *__unused)
mutex_lock(&hash_resize_mutex);
nsize = xfrm_hash_new_size();
ndst = xfrm_state_hash_alloc(nsize);
ndst = xfrm_hash_alloc(nsize);
if (!ndst)
goto out_unlock;
nsrc = xfrm_state_hash_alloc(nsize);
nsrc = xfrm_hash_alloc(nsize);
if (!nsrc) {
xfrm_state_hash_free(ndst, nsize);
xfrm_hash_free(ndst, nsize);
goto out_unlock;
}
nspi = xfrm_state_hash_alloc(nsize);
nspi = xfrm_hash_alloc(nsize);
if (!nspi) {
xfrm_state_hash_free(ndst, nsize);
xfrm_state_hash_free(nsrc, nsize);
xfrm_hash_free(ndst, nsize);
xfrm_hash_free(nsrc, nsize);
goto out_unlock;
}
@ -251,9 +155,9 @@ static void xfrm_hash_resize(void *__unused)
spin_unlock_bh(&xfrm_state_lock);
osize = (ohashmask + 1) * sizeof(struct hlist_head);
xfrm_state_hash_free(odst, osize);
xfrm_state_hash_free(osrc, osize);
xfrm_state_hash_free(ospi, osize);
xfrm_hash_free(odst, osize);
xfrm_hash_free(osrc, osize);
xfrm_hash_free(ospi, osize);
out_unlock:
mutex_unlock(&hash_resize_mutex);
@ -1643,9 +1547,9 @@ void __init xfrm_state_init(void)
sz = sizeof(struct hlist_head) * 8;
xfrm_state_bydst = xfrm_state_hash_alloc(sz);
xfrm_state_bysrc = xfrm_state_hash_alloc(sz);
xfrm_state_byspi = xfrm_state_hash_alloc(sz);
xfrm_state_bydst = xfrm_hash_alloc(sz);
xfrm_state_bysrc = xfrm_hash_alloc(sz);
xfrm_state_byspi = xfrm_hash_alloc(sz);
if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi)
panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes.");
xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);