[UDP]: Revert 2-pass hashing changes.

This reverts changesets:

6aaf47fa
b7b5f487
de34ed91
fc038410

There are still some correctness issues recently
discovered which do not have a known fix that doesn't
involve doing a full hash table scan on port bind.

So revert for now.
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/udp.h

@@ -119,16 +119,9 @@ static inline void udp_lib_close(struct sock *sk, long timeout)
 }
 
 
-struct udp_get_port_ops {
-	int (*saddr_cmp)(const struct sock *sk1, const struct sock *sk2);
-	int (*saddr_any)(const struct sock *sk);
-	unsigned int (*hash_port_and_rcv_saddr)(__u16 port,
-						const struct sock *sk);
-};
-
 /* net/ipv4/udp.c */
 extern int	udp_get_port(struct sock *sk, unsigned short snum,
-			     const struct udp_get_port_ops *ops);
+			     int (*saddr_cmp)(const struct sock *, const struct sock *));
 extern void	udp_err(struct sk_buff *, u32);
 
 extern int	udp_sendmsg(struct kiocb *iocb, struct sock *sk,

include/net/udplite.h

@@ -120,5 +120,5 @@ static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
 
 extern void	udplite4_register(void);
 extern int 	udplite_get_port(struct sock *sk, unsigned short snum,
-				 const struct udp_get_port_ops *ops);
+			int (*scmp)(const struct sock *, const struct sock *));
 #endif	/* _UDPLITE_H */

net/ipv4/udp_impl.h

@@ -5,14 +5,14 @@
 #include <net/protocol.h>
 #include <net/inet_common.h>
 
-extern const struct udp_get_port_ops udp_ipv4_ops;
-
 extern int  	__udp4_lib_rcv(struct sk_buff *, struct hlist_head [], int );
 extern void 	__udp4_lib_err(struct sk_buff *, u32, struct hlist_head []);
 
 extern int	__udp_lib_get_port(struct sock *sk, unsigned short snum,
 				   struct hlist_head udptable[], int *port_rover,
-				   const struct udp_get_port_ops *ops);
+				   int (*)(const struct sock*,const struct sock*));
+extern int	ipv4_rcv_saddr_equal(const struct sock *, const struct sock *);
+
 
 extern int	udp_setsockopt(struct sock *sk, int level, int optname,
 			       char __user *optval, int optlen);

net/ipv4/udplite.c

@@ -19,15 +19,14 @@ struct hlist_head 	udplite_hash[UDP_HTABLE_SIZE];
 static int		udplite_port_rover;
 
 int udplite_get_port(struct sock *sk, unsigned short p,
-		     const struct udp_get_port_ops *ops)
+		     int (*c)(const struct sock *, const struct sock *))
 {
-	return  __udp_lib_get_port(sk, p, udplite_hash,
-				   &udplite_port_rover, ops);
+	return  __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c);
 }
 
 static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
 {
-	return udplite_get_port(sk, snum, &udp_ipv4_ops);
+	return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
 }
 
 static int udplite_rcv(struct sk_buff *skb)

net/ipv6/udp.c

@@ -52,28 +52,9 @@
 
 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
 
-static int ipv6_rcv_saddr_any(const struct sock *sk)
-{
-	struct ipv6_pinfo *np = inet6_sk(sk);
-
-	return ipv6_addr_any(&np->rcv_saddr);
-}
-
-static unsigned int ipv6_hash_port_and_rcv_saddr(__u16 port,
-						 const struct sock *sk)
-{
-	return port;
-}
-
-const struct udp_get_port_ops udp_ipv6_ops = {
-	.saddr_cmp = ipv6_rcv_saddr_equal,
-	.saddr_any = ipv6_rcv_saddr_any,
-	.hash_port_and_rcv_saddr = ipv6_hash_port_and_rcv_saddr,
-};
-
 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
 {
-	return udp_get_port(sk, snum, &udp_ipv6_ops);
+	return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
 }
 
 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,

net/ipv6/udp_impl.h

@@ -6,8 +6,6 @@
 #include <net/addrconf.h>
 #include <net/inet_common.h>
 
-extern const struct udp_get_port_ops udp_ipv6_ops;
-
 extern int  	__udp6_lib_rcv(struct sk_buff **, struct hlist_head [], int );
 extern void 	__udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *,
 			       int , int , int , __be32 , struct hlist_head []);

net/ipv6/udplite.c

@@ -37,7 +37,7 @@ static struct inet6_protocol udplitev6_protocol = {
 
 static int udplite_v6_get_port(struct sock *sk, unsigned short snum)
 {
-	return udplite_get_port(sk, snum, &udp_ipv6_ops);
+	return udplite_get_port(sk, snum, ipv6_rcv_saddr_equal);
 }
 
 struct proto udplitev6_prot = {