rds: Changing IP address internal representation to struct in6_addr

This patch changes the internal representation of an IP address to use
struct in6_addr.  IPv4 address is stored as an IPv4 mapped address.
All the functions which take an IP address as argument are also
changed to use struct in6_addr.  But RDS socket layer is not modified
such that it still does not accept IPv6 address from an application.
And RDS layer does not accept nor initiate IPv6 connections.

v2: Fixed sparse warnings.

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>

1 files changed, 29 insertions, 3 deletions

diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 351a28474667..dadb33790333 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006 Oracle.  All rights reserved.
+ * Copyright (c) 2006, 2017 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
@@ -37,6 +37,8 @@
 #include <net/tcp.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
+#include <net/tcp.h>
+#include <net/addrconf.h>
 
 #include "rds.h"
 #include "tcp.h"
@@ -262,9 +264,33 @@ out:
         spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
 }
 
-static int rds_tcp_laddr_check(struct net *net, __be32 addr)
+static int rds_tcp_laddr_check(struct net *net, const struct in6_addr *addr,
+                               __u32 scope_id)
 {
-        if (inet_addr_type(net, addr) == RTN_LOCAL)
+        struct net_device *dev = NULL;
+        int ret;
+
+        if (ipv6_addr_v4mapped(addr)) {
+                if (inet_addr_type(net, addr->s6_addr32[3]) == RTN_LOCAL)
+                        return 0;
+                return -EADDRNOTAVAIL;
+        }
+
+        /* If the scope_id is specified, check only those addresses
+         * hosted on the specified interface.
+         */
+        if (scope_id != 0) {
+                rcu_read_lock();
+                dev = dev_get_by_index_rcu(net, scope_id);
+                /* scope_id is not valid... */
+                if (!dev) {
+                        rcu_read_unlock();
+                        return -EADDRNOTAVAIL;
+                }
+                rcu_read_unlock();
+        }
+        ret = ipv6_chk_addr(net, addr, dev, 0);
+        if (ret)
                 return 0;
         return -EADDRNOTAVAIL;
 }