[XFRM]: Hash xfrm_state objects by source address too.

The source address is always non-prefixed so we should use
it to help give entropy to the bydst hash.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 0bc6a4b1ceae074fb0079a5964f2be3287a6dc76..37213f9f6a02c8c368ac0fdeb36dd7c08f3aa821 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -65,26 +65,40 @@ static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
        return ntohl(addr->a6[2]^addr->a6[3]);
 }
 
-static inline unsigned int __xfrm_dst_hash(xfrm_address_t *addr,
+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_addr_hash(addr);
+               h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
                break;
        case AF_INET6:
-               h ^= __xfrm6_addr_hash(addr);
+               h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
                break;
        };
        return (h ^ (h >> 16)) & hmask;
 }
 
-static inline unsigned int xfrm_dst_hash(xfrm_address_t *addr, u32 reqid,
+static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
+                                        xfrm_address_t *saddr,
+                                        u32 reqid,
                                         unsigned short family)
 {
-       return __xfrm_dst_hash(addr, reqid, family, xfrm_state_hmask);
+       return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask);
 }
 
 static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family,
@@ -108,25 +122,25 @@ static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family
 }
 
 static inline unsigned int
-__xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family,
-               unsigned int hmask)
+__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(addr);
+               h ^= __xfrm4_addr_hash(daddr);
                break;
        case AF_INET6:
-               h ^= __xfrm6_addr_hash(addr);
+               h ^= __xfrm6_addr_hash(daddr);
                break;
        }
        return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
 }
 
 static inline unsigned int
-xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
+xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family)
 {
-       return __xfrm_spi_hash(addr, spi, proto, family, xfrm_state_hmask);
+       return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask);
 }
 
 static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz)
@@ -169,8 +183,9 @@ static void xfrm_hash_transfer(struct hlist_head *list,
        hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
                unsigned int h;
 
-               h = __xfrm_dst_hash(&x->id.daddr, x->props.reqid,
-                                   x->props.family, nhashmask);
+               h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
+                                   x->props.reqid, x->props.family,
+                                   nhashmask);
                hlist_add_head(&x->bydst, ndsttable+h);
 
                h = __xfrm_src_hash(&x->props.saddr, x->props.family,
@@ -587,7 +602,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                struct xfrm_policy *pol, int *err,
                unsigned short family)
 {
-       unsigned int h = xfrm_dst_hash(daddr, tmpl->reqid, family);
+       unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
        struct hlist_node *entry;
        struct xfrm_state *x, *x0;
        int acquire_in_progress = 0;
@@ -696,7 +711,8 @@ static void __xfrm_state_insert(struct xfrm_state *x)
 
        x->genid = ++xfrm_state_genid;
 
-       h = xfrm_dst_hash(&x->id.daddr, x->props.reqid, x->props.family);
+       h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
+                         x->props.reqid, x->props.family);
        hlist_add_head(&x->bydst, xfrm_state_bydst+h);
 
        h = xfrm_src_hash(&x->props.saddr, x->props.family);
@@ -732,11 +748,12 @@ static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
        struct hlist_node *entry;
        unsigned int h;
 
-       h = xfrm_dst_hash(&xnew->id.daddr, reqid, family);
+       h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family);
        hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
                if (x->props.family     == family &&
                    x->props.reqid      == reqid &&
-                   !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family))
+                   !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
+                   !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
                        x->genid = xfrm_state_genid;
        }
 }
@@ -753,7 +770,7 @@ EXPORT_SYMBOL(xfrm_state_insert);
 /* xfrm_state_lock is held */
 static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
 {
-       unsigned int h = xfrm_dst_hash(daddr, reqid, family);
+       unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family);
        struct hlist_node *entry;
        struct xfrm_state *x;