NFS: Refactor mount option address parsing into separate function

Refactor the logic to parse incoming text-based IP addresses.  Use the
in4_pton() function instead of the older in_aton(), following the lead
of the in-kernel CIFS client.

Later we'll add IPv6 address parsing using the matching in6_pton()
function.  For now we can't allow IPv6 address parsing: we must expand
the size of the address storage fields in the nfs_parsed_mount_options
struct before we can parse and store IPv6 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Aurelien Charbon <aurelien.charbon@ext.bull.net>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 24 insertions, 6 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f120be43d543..041fe9e9b74d 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -641,6 +641,26 @@ static int nfs_verify_server_address(struct sockaddr *addr)
 }
 
 /*
+ * Parse string addresses passed in via a mount option,
+ * and construct a sockaddr based on the result.
+ *
+ * If address parsing fails, set the sockaddr's address
+ * family to AF_UNSPEC to force nfs_verify_server_address()
+ * to punt the mount.
+ */
+static void nfs_parse_server_address(char *value,
+                                     struct sockaddr *sap)
+{
+        struct sockaddr_in *ap = (void *)sap;
+
+        ap->sin_family = AF_INET;
+        if (in4_pton(value, -1, (u8 *)&ap->sin_addr.s_addr, '\0', NULL))
+                return;
+
+        sap->sa_family = AF_UNSPEC;
+}
+
+/*
  * Error-check and convert a string of mount options from user space into
  * a data structure
  */
@@ -963,9 +983,8 @@ static int nfs_parse_mount_options(char *raw,
                         string = match_strdup(args);
                         if (string == NULL)
                                 goto out_nomem;
-                        mnt->nfs_server.address.sin_family = AF_INET;
-                        mnt->nfs_server.address.sin_addr.s_addr =
-                                                        in_aton(string);
+                        nfs_parse_server_address(string, (struct sockaddr *)
+                                                 &mnt->nfs_server.address);
                         kfree(string);
                         break;
                 case Opt_clientaddr:
@@ -984,9 +1003,8 @@ static int nfs_parse_mount_options(char *raw,
                         string = match_strdup(args);
                         if (string == NULL)
                                 goto out_nomem;
-                        mnt->mount_server.address.sin_family = AF_INET;
-                        mnt->mount_server.address.sin_addr.s_addr =
-                                                        in_aton(string);
+                        nfs_parse_server_address(string, (struct sockaddr *)
+                                                 &mnt->mount_server.address);
                         kfree(string);
                         break;