Socket hash lookups are made within namespace. Hash tables are common for all
 namespaces, with additional permutation of indexes.  Asynchronous events
 should be run in proper namespace.

 Signed-off-by: Dmitry Mishin <dim@openvz.org>

---
 include/linux/ipv6.h             |    3 ++-
 include/net/inet6_hashtables.h   |    6 ++++--
 include/net/inet_hashtables.h    |   36 +++++++++++++++++++++++-------------
 include/net/inet_sock.h          |    6 ++++--
 include/net/inet_timewait_sock.h |    2 ++
 include/net/sock.h               |    2 ++
 include/net/udp.h                |    4 ++++
 net/core/sock.c                  |    6 ++++++
 net/ipv4/af_inet.c               |   11 +++++++++++
 net/ipv4/inet_connection_sock.c  |   19 +++++++++++++++----
 net/ipv4/inet_hashtables.c       |   30 +++++++++++++++++++++++-------
 net/ipv4/inet_timewait_sock.c    |   17 +++++++++++++++--
 net/ipv4/raw.c                   |    2 ++
 net/ipv4/tcp_timer.c             |    9 +++++++++
 net/ipv4/udp.c                   |   27 ++++++++++++++++++---------
 net/ipv6/inet6_connection_sock.c |    2 ++
 net/ipv6/inet6_hashtables.c      |   25 ++++++++++++++++++-------
 net/ipv6/raw.c                   |    4 ++++
 net/ipv6/udp.c                   |   10 ++++++++--
 19 files changed, 172 insertions(+), 49 deletions(-)

--- linux-2.6.20-rc4-mm1.net_ns.orig/include/linux/ipv6.h
+++ linux-2.6.20-rc4-mm1.net_ns/include/linux/ipv6.h
@@ -459,10 +459,11 @@ static inline struct raw6_sock *raw6_sk(
 #define inet_v6_ipv6only(__sk)		0
 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 
-#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
+#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif, __ns)\
 	(((__sk)->sk_hash == (__hash))				&& \
 	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))  	&& \
 	 ((__sk)->sk_family		== AF_INET6)		&& \
+	 net_ns_match((__sk)->sk_net_ns, __ns)			&& \
 	 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))	&& \
 	 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr))	&& \
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
--- linux-2.6.20-rc4-mm1.net_ns.orig/include/net/inet6_hashtables.h
+++ linux-2.6.20-rc4-mm1.net_ns/include/net/inet6_hashtables.h
@@ -26,11 +26,13 @@ struct inet_hashinfo;
 
 /* I have no idea if this is a good hash for v6 or not. -DaveM */
 static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
-				const struct in6_addr *faddr, const __be16 fport)
+				const struct in6_addr *faddr, const __be16 fport,
+				struct net_namespace *ns)
 {
 	unsigned int hashent = (lport ^ (__force u16)fport);
 
 	hashent ^= (__force u32)(laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
+	hashent ^= net_ns_hash(ns);
 	hashent ^= hashent >> 16;
 	hashent ^= hashent >> 8;
 	return hashent;
@@ -44,7 +46,7 @@ static inline int inet6_sk_ehashfn(const
 	const struct in6_addr *faddr = &np->daddr;
 	const __u16 lport = inet->num;
 	const __be16 fport = inet->dport;
-	return inet6_ehashfn(laddr, lport, faddr, fport);
+	return inet6_ehashfn(laddr, lport, faddr, fport, current_net_ns);
 }
 
 extern void __inet6_hash(struct inet_hashinfo *hashinfo, struct sock *sk);
--- linux-2.6.20-rc4-mm1.net_ns.orig/include/net/inet_hashtables.h
+++ linux-2.6.20-rc4-mm1.net_ns/include/net/inet_hashtables.h
@@ -78,6 +78,7 @@ struct inet_bind_bucket {
 	signed short		fastreuse;
 	struct hlist_node	node;
 	struct hlist_head	owners;
+	struct net_namespace	*net_ns;
 };
 
 #define inet_bind_bucket_for_each(tb, node, head) \
@@ -142,30 +143,34 @@ extern struct inet_bind_bucket *
 extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,
 				     struct inet_bind_bucket *tb);
 
-static inline int inet_bhashfn(const __u16 lport, const int bhash_size)
+static inline int inet_bhashfn(const __u16 lport,
+			       struct net_namespace *ns,
+			       const int bhash_size)
 {
-	return lport & (bhash_size - 1);
+	return (lport ^ net_ns_hash(ns)) & (bhash_size - 1);
 }
 
 extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 			   const unsigned short snum);
 
 /* These can have wildcards, don't try too hard. */
-static inline int inet_lhashfn(const unsigned short num)
+static inline int inet_lhashfn(const unsigned short num,
+			       struct net_namespace *ns)
 {
-	return num & (INET_LHTABLE_SIZE - 1);
+	return (num ^ net_ns_hash(ns)) & (INET_LHTABLE_SIZE - 1);
 }
 
 static inline int inet_sk_listen_hashfn(const struct sock *sk)
 {
-	return inet_lhashfn(inet_sk(sk)->num);
+	return inet_lhashfn(inet_sk(sk)->num, current_net_ns);
 }
 
 /* Caller must disable local BH processing. */
 static inline void __inet_inherit_port(struct inet_hashinfo *table,
 				       struct sock *sk, struct sock *child)
 {
-	const int bhash = inet_bhashfn(inet_sk(child)->num, table->bhash_size);
+	const int bhash = inet_bhashfn(inet_sk(child)->num, current_net_ns,
+					table->bhash_size);
 	struct inet_bind_hashbucket *head = &table->bhash[bhash];
 	struct inet_bind_bucket *tb;
 
@@ -313,29 +318,33 @@ typedef __u64 __bitwise __addrpair;
 				   (((__force __u64)(__be32)(__daddr)) << 32) | \
 				   ((__force __u64)(__be32)(__saddr)));
 #endif /* __BIG_ENDIAN */
-#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
+#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif, __ns)\
 	(((__sk)->sk_hash == (__hash))				&&	\
 	 ((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie))	&&	\
 	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))	&&	\
+	 net_ns_match((__sk)->sk_net_ns, __ns)				&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
-#define INET_TW_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
+#define INET_TW_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif, __ns)\
 	(((__sk)->sk_hash == (__hash))				&&	\
 	 ((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) &&	\
 	 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) &&	\
+	 net_ns_match((__sk)->sk_net_ns, __ns)				&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #else /* 32-bit arch */
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr)
-#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)	\
+#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif, __ns)\
 	(((__sk)->sk_hash == (__hash))				&&	\
 	 (inet_sk(__sk)->daddr		== (__saddr))		&&	\
 	 (inet_sk(__sk)->rcv_saddr	== (__daddr))		&&	\
 	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))	&&	\
+	 net_ns_match((__sk)->sk_net_ns, __ns)			&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
-#define INET_TW_MATCH(__sk, __hash,__cookie, __saddr, __daddr, __ports, __dif)	\
+#define INET_TW_MATCH(__sk, __hash,__cookie, __saddr, __daddr, __ports, __dif, __ns)\
 	(((__sk)->sk_hash == (__hash))				&&	\
 	 (inet_twsk(__sk)->tw_daddr	== (__saddr))		&&	\
 	 (inet_twsk(__sk)->tw_rcv_saddr	== (__daddr))		&&	\
 	 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) &&	\
+	 net_ns_match((__sk)->sk_net_ns, __ns)			&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #endif /* 64-bit arch */
 
@@ -355,22 +364,23 @@ static inline struct sock *
 	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
 	struct sock *sk;
 	const struct hlist_node *node;
+	struct net_namespace *ns = current_net_ns;
 	/* Optimize here for direct hit, only listening connections can
 	 * have wildcards anyways.
 	 */
-	unsigned int hash = inet_ehashfn(daddr, hnum, saddr, sport);
+	unsigned int hash = inet_ehashfn(daddr, hnum, saddr, sport, ns);
 	struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
 
 	prefetch(head->chain.first);
 	read_lock(&head->lock);
 	sk_for_each(sk, node, &head->chain) {
-		if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+		if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif, ns))
 			goto hit; /* You sunk my battleship! */
 	}
 
 	/* Must check for a TIME_WAIT'er before going to listener hash. */
 	sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
-		if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+		if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif, ns))
 			goto hit;
 	}
 	sk = NULL;
--- linux-2.6.20-rc4-mm1.net_ns.orig/include/net/inet_sock.h
+++ linux-2.6.20-rc4-mm1.net_ns/include/net/inet_sock.h
@@ -168,9 +168,11 @@ static inline void inet_sk_copy_descenda
 extern int inet_sk_rebuild_header(struct sock *sk);
 
 static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
-					const __be32 faddr, const __be16 fport)
+					const __be32 faddr, const __be16 fport,
+					struct net_namespace *ns)
 {
 	unsigned int h = ((__force __u32)laddr ^ lport) ^ ((__force __u32)faddr ^ (__force __u32)fport);
+	h ^= net_ns_hash(ns);
 	h ^= h >> 16;
 	h ^= h >> 8;
 	return h;
@@ -184,7 +186,7 @@ static inline int inet_sk_ehashfn(const 
 	const __be32 faddr = inet->daddr;
 	const __be16 fport = inet->dport;
 
-	return inet_ehashfn(laddr, lport, faddr, fport);
+	return inet_ehashfn(laddr, lport, faddr, fport, current_net_ns);
 }
 
 #endif	/* _INET_SOCK_H */
--- linux-2.6.20-rc4-mm1.net_ns.orig/include/net/inet_timewait_sock.h
+++ linux-2.6.20-rc4-mm1.net_ns/include/net/inet_timewait_sock.h
@@ -115,6 +115,7 @@ struct inet_timewait_sock {
 #define tw_refcnt		__tw_common.skc_refcnt
 #define tw_hash			__tw_common.skc_hash
 #define tw_prot			__tw_common.s