Since UDP and UDP-Lite had dedicated socket hash tables for
each, we have had to fetch them from different pointers.

UDP always has its global or per-netns table in
net->ipv4.udp_table and struct proto.h.udp_table is NULL.

OTOH, UDP-Lite had only one global table in the pointer.

We no longer use the field.

Let's remove it and udp_get_table_prot().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
---
 include/net/sock.h |  1 -
 net/ipv4/udp.c     | 26 ++++++++++++--------------
 net/ipv6/udp.c     |  1 -
 3 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 16a1b8895206..7d51ac9e7d9a 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1392,7 +1392,6 @@ struct proto {
 
 	union {
 		struct inet_hashinfo	*hashinfo;
-		struct udp_table	*udp_table;
 		struct raw_hashinfo	*raw_hash;
 		struct smc_hashinfo	*smc_hash;
 	} h;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d47ca721ef0d..a7ca727347ce 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -134,11 +134,6 @@ EXPORT_PER_CPU_SYMBOL_GPL(udp_memory_per_cpu_fw_alloc);
 #define MAX_UDP_PORTS 65536
 #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN_PERNET)
 
-static struct udp_table *udp_get_table_prot(struct sock *sk)
-{
-	return sk->sk_prot->h.udp_table ? : sock_net(sk)->ipv4.udp_table;
-}
-
 static int udp_lib_lport_inuse(struct net *net, __u16 num,
 			       const struct udp_hslot *hslot,
 			       unsigned long *bitmap,
@@ -240,11 +235,13 @@ static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot)
 int udp_lib_get_port(struct sock *sk, unsigned short snum,
 		     unsigned int hash2_nulladdr)
 {
-	struct udp_table *udptable = udp_get_table_prot(sk);
 	struct udp_hslot *hslot, *hslot2;
 	struct net *net = sock_net(sk);
+	struct udp_table *udptable;
 	int error = -EADDRINUSE;
 
+	udptable = net->ipv4.udp_table;
+
 	if (!snum) {
 		DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);
 		unsigned short first, last;
@@ -2224,12 +2221,13 @@ EXPORT_IPV6_MOD(udp_disconnect);
 void udp_lib_unhash(struct sock *sk)
 {
 	if (sk_hashed(sk)) {
-		struct udp_table *udptable = udp_get_table_prot(sk);
 		struct udp_hslot *hslot, *hslot2;
+		struct net *net = sock_net(sk);
+		struct udp_table *udptable;
 
 		sock_rps_delete_flow(sk);
-		hslot  = udp_hashslot(udptable, sock_net(sk),
-				      udp_sk(sk)->udp_port_hash);
+		udptable = net->ipv4.udp_table;
+		hslot  = udp_hashslot(udptable, net, udp_sk(sk)->udp_port_hash);
 		hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
 
 		spin_lock_bh(&hslot->lock);
@@ -2238,7 +2236,7 @@ void udp_lib_unhash(struct sock *sk)
 		if (sk_del_node_init_rcu(sk)) {
 			hslot->count--;
 			inet_sk(sk)->inet_num = 0;
-			sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+			sock_prot_inuse_add(net, sk->sk_prot, -1);
 
 			spin_lock(&hslot2->lock);
 			hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
@@ -2258,11 +2256,12 @@ EXPORT_IPV6_MOD(udp_lib_unhash);
 void udp_lib_rehash(struct sock *sk, u16 newhash, u16 newhash4)
 {
 	if (sk_hashed(sk)) {
-		struct udp_table *udptable = udp_get_table_prot(sk);
 		struct udp_hslot *hslot, *hslot2, *nhslot2;
+		struct net *net = sock_net(sk);
+		struct udp_table *udptable;
 
-		hslot = udp_hashslot(udptable, sock_net(sk),
-				     udp_sk(sk)->udp_port_hash);
+		udptable = net->ipv4.udp_table;
+		hslot = udp_hashslot(udptable, net, udp_sk(sk)->udp_port_hash);
 		hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
 		nhslot2 = udp_hashslot2(udptable, newhash);
 
@@ -3175,7 +3174,6 @@ struct proto udp_prot = {
 	.sysctl_wmem_offset	= offsetof(struct net, ipv4.sysctl_udp_wmem_min),
 	.sysctl_rmem_offset	= offsetof(struct net, ipv4.sysctl_udp_rmem_min),
 	.obj_size		= sizeof(struct udp_sock),
-	.h.udp_table		= NULL,
 	.diag_destroy		= udp_abort,
 };
 EXPORT_SYMBOL(udp_prot);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index c3d8b5ede164..5bddbf457b61 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1924,7 +1924,6 @@ struct proto udpv6_prot = {
 	.sysctl_rmem_offset     = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
 	.obj_size		= sizeof(struct udp6_sock),
 	.ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
-	.h.udp_table		= NULL,
 	.diag_destroy		= udp_abort,
 };
 
-- 
2.53.0.473.g4a7958ca14-goog