[XFRM]: Extract common hashing code into xfrm_hash.[ch]
David S. Miller [Thu, 24 Aug 2006 11:50:50 +0000 (04:50 -0700)]
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/Makefile
net/xfrm/xfrm_hash.c [new file with mode: 0644]
net/xfrm/xfrm_hash.h [new file with mode: 0644]
net/xfrm/xfrm_policy.c
net/xfrm/xfrm_state.c

index 693aac1..de3c1a6 100644 (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
 
diff --git a/net/xfrm/xfrm_hash.c b/net/xfrm/xfrm_hash.c
new file mode 100644 (file)
index 0000000..37643bb
--- /dev/null
@@ -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));
+}
diff --git a/net/xfrm/xfrm_hash.h b/net/xfrm/xfrm_hash.h
new file mode 100644 (file)
index 0000000..d3abb0b
--- /dev/null
@@ -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 */
index 087a544..b446ca3 100644 (file)
 #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");
index 37213f9..4341795 100644 (file)
 #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);