1 files changed, 76 insertions, 6 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 2040bff945d4..c27c8f10ebdc 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -65,6 +65,69 @@ struct inet_peer {
         atomic_t                refcnt;
 };
 
+struct inet_peer_base {
+        struct inet_peer __rcu  *root;
+        seqlock_t               lock;
+        u32                     flush_seq;
+        int                     total;
+};
+
+#define INETPEER_BASE_BIT       0x1UL
+
+static inline struct inet_peer *inetpeer_ptr(unsigned long val)
+{
+        BUG_ON(val & INETPEER_BASE_BIT);
+        return (struct inet_peer *) val;
+}
+
+static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val)
+{
+        if (!(val & INETPEER_BASE_BIT))
+                return NULL;
+        val &= ~INETPEER_BASE_BIT;
+        return (struct inet_peer_base *) val;
+}
+
+static inline bool inetpeer_ptr_is_peer(unsigned long val)
+{
+        return !(val & INETPEER_BASE_BIT);
+}
+
+static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer)
+{
+        /* This implicitly clears INETPEER_BASE_BIT */
+        *val = (unsigned long) peer;
+}
+
+static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer)
+{
+        unsigned long val = (unsigned long) peer;
+        unsigned long orig = *ptr;
+
+        if (!(orig & INETPEER_BASE_BIT) ||
+            cmpxchg(ptr, orig, val) != orig)
+                return false;
+        return true;
+}
+
+static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
+{
+        *ptr = (unsigned long) base | INETPEER_BASE_BIT;
+}
+
+static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from)
+{
+        unsigned long val = *from;
+
+        *to = val;
+        if (inetpeer_ptr_is_peer(val)) {
+                struct inet_peer *peer = inetpeer_ptr(val);
+                atomic_inc(&peer->refcnt);
+        }
+}
+
+extern void inet_peer_base_init(struct inet_peer_base *);
+
 void                    inet_initpeers(void) __init;
 
 #define INETPEER_METRICS_NEW    (~(u32) 0)
@@ -75,31 +138,38 @@ static inline bool inet_metrics_new(const struct inet_peer *p)
 }
 
 /* can be called with or without local BH being disabled */
-struct inet_peer        *inet_getpeer(const struct inetpeer_addr *daddr, int create);
+struct inet_peer *inet_getpeer(struct inet_peer_base *base,
+                               const struct inetpeer_addr *daddr,
+                               int create);
 
-static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create)
+static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
+                                                __be32 v4daddr,
+                                                int create)
 {
         struct inetpeer_addr daddr;
 
         daddr.addr.a4 = v4daddr;
         daddr.family = AF_INET;
-        return inet_getpeer(&daddr, create);
+        return inet_getpeer(base, &daddr, create);
 }
 
-static inline struct inet_peer *inet_getpeer_v6(const struct in6_addr *v6daddr, int create)
+static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
+                                                const struct in6_addr *v6daddr,
+                                                int create)
 {
         struct inetpeer_addr daddr;
 
         *(struct in6_addr *)daddr.addr.a6 = *v6daddr;
         daddr.family = AF_INET6;
-        return inet_getpeer(&daddr, create);
+        return inet_getpeer(base, &daddr, create);
 }
 
 /* can be called from BH context or outside */
 extern void inet_putpeer(struct inet_peer *p);
 extern bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
 
-extern void inetpeer_invalidate_tree(int family);
+extern void inetpeer_invalidate_tree(struct inet_peer_base *);
+extern void inetpeer_invalidate_family(int family);
 
 /*
  * temporary check to make sure we dont access rid, ip_id_count, tcp_ts,