net/rds: Add RDS6_INFO_SOCKETS and RDS6_INFO_RECV_MESSAGES options

Add support of the socket options RDS6_INFO_SOCKETS and
RDS6_INFO_RECV_MESSAGES which update the RDS_INFO_SOCKETS and
RDS_INFO_RECV_MESSAGES options respectively.  The old options work
for IPv4 sockets only.
Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rds/af_rds.c

 /*
- * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -741,6 +741,10 @@ static void rds_sock_inc_info(struct socket *sock, unsigned int len,
 	spin_lock_bh(&rds_sock_lock);
 
 	list_for_each_entry(rs, &rds_sock_list, rs_item) {
+		/* This option only supports IPv4 sockets. */
+		if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
+			continue;
+
 		read_lock(&rs->rs_recv_lock);
 
 		/* XXX too lazy to maintain counts.. */
@@ -762,21 +766,60 @@ static void rds_sock_inc_info(struct socket *sock, unsigned int len,
 	lens->each = sizeof(struct rds_info_message);
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static void rds6_sock_inc_info(struct socket *sock, unsigned int len,
+			       struct rds_info_iterator *iter,
+			       struct rds_info_lengths *lens)
+{
+	struct rds_incoming *inc;
+	unsigned int total = 0;
+	struct rds_sock *rs;
+
+	len /= sizeof(struct rds6_info_message);
+
+	spin_lock_bh(&rds_sock_lock);
+
+	list_for_each_entry(rs, &rds_sock_list, rs_item) {
+		read_lock(&rs->rs_recv_lock);
+
+		list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
+			total++;
+			if (total <= len)
+				rds6_inc_info_copy(inc, iter, &inc->i_saddr,
+						   &rs->rs_bound_addr, 1);
+		}
+
+		read_unlock(&rs->rs_recv_lock);
+	}
+
+	spin_unlock_bh(&rds_sock_lock);
+
+	lens->nr = total;
+	lens->each = sizeof(struct rds6_info_message);
+}
+#endif
+
 static void rds_sock_info(struct socket *sock, unsigned int len,
 			  struct rds_info_iterator *iter,
 			  struct rds_info_lengths *lens)
 {
 	struct rds_info_socket sinfo;
+	unsigned int cnt = 0;
 	struct rds_sock *rs;
 
 	len /= sizeof(struct rds_info_socket);
 
 	spin_lock_bh(&rds_sock_lock);
 
-	if (len < rds_sock_count)
+	if (len < rds_sock_count) {
+		cnt = rds_sock_count;
 		goto out;
+	}
 
 	list_for_each_entry(rs, &rds_sock_list, rs_item) {
+		/* This option only supports IPv4 sockets. */
+		if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
+			continue;
 		sinfo.sndbuf = rds_sk_sndbuf(rs);
 		sinfo.rcvbuf = rds_sk_rcvbuf(rs);
 		sinfo.bound_addr = rs->rs_bound_addr_v4;
@@ -786,15 +829,51 @@ static void rds_sock_info(struct socket *sock, unsigned int len,
 		sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
 
 		rds_info_copy(iter, &sinfo, sizeof(sinfo));
+		cnt++;
 	}
 
 out:
-	lens->nr = rds_sock_count;
+	lens->nr = cnt;
 	lens->each = sizeof(struct rds_info_socket);
 
 	spin_unlock_bh(&rds_sock_lock);
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static void rds6_sock_info(struct socket *sock, unsigned int len,
+			   struct rds_info_iterator *iter,
+			   struct rds_info_lengths *lens)
+{
+	struct rds6_info_socket sinfo6;
+	struct rds_sock *rs;
+
+	len /= sizeof(struct rds6_info_socket);
+
+	spin_lock_bh(&rds_sock_lock);
+
+	if (len < rds_sock_count)
+		goto out;
+
+	list_for_each_entry(rs, &rds_sock_list, rs_item) {
+		sinfo6.sndbuf = rds_sk_sndbuf(rs);
+		sinfo6.rcvbuf = rds_sk_rcvbuf(rs);
+		sinfo6.bound_addr = rs->rs_bound_addr;
+		sinfo6.connected_addr = rs->rs_conn_addr;
+		sinfo6.bound_port = rs->rs_bound_port;
+		sinfo6.connected_port = rs->rs_conn_port;
+		sinfo6.inum = sock_i_ino(rds_rs_to_sk(rs));
+
+		rds_info_copy(iter, &sinfo6, sizeof(sinfo6));
+	}
+
+ out:
+	lens->nr = rds_sock_count;
+	lens->each = sizeof(struct rds6_info_socket);
+
+	spin_unlock_bh(&rds_sock_lock);
+}
+#endif
+
 static void rds_exit(void)
 {
 	sock_unregister(rds_family_ops.family);
@@ -808,6 +887,10 @@ static void rds_exit(void)
 	rds_bind_lock_destroy();
 	rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
 	rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
+#if IS_ENABLED(CONFIG_IPV6)
+	rds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);
+	rds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
+#endif
 }
 module_exit(rds_exit);
 
@@ -845,6 +928,10 @@ static int rds_init(void)
 
 	rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
 	rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
+#if IS_ENABLED(CONFIG_IPV6)
+	rds_info_register_func(RDS6_INFO_SOCKETS, rds6_sock_info);
+	rds_info_register_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
+#endif
 
 	goto out;