[PATCH 07/14] text-based mount command: "clientaddr=" option support for IPv6 addresses

[Chuck Lever <chuck.lever@oracle.com>]

Change the append_clientaddr_option() function to support sending either
IPv4 or IPv6 addresses to the kernel via the "clientaddr=" option.

If the mount.nfs4 command can't determine an appropriate callback address,
it used to fail the mount request.  This new function simply sends an ANY
address instead, so the mount request succeeds, but delegation is disabled.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---

 utils/mount/stropts.c |   26 ++++++++++++--------------
 1 files changed, 12 insertions(+), 14 deletions(-)


diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index f856998..ff51652 100644
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -252,24 +252,21 @@ static int nfs_append_addr_option(const struct sockaddr *sap,
  * Returns 1 if 'clientaddr=' option created successfully or if
  * 'clientaddr=' option is already present; otherwise zero.
  */
-static int append_clientaddr_option(struct sockaddr_in *saddr,
-				    struct mount_options *options)
+static int nfs_append_clientaddr_option(const struct sockaddr *sap,
+					socklen_t salen,
+					struct mount_options *options)
 {
-	struct sockaddr_in my_addr;
-	char new_option[32];
+	struct sockaddr_storage dummy;
+	struct sockaddr *my_addr = (struct sockaddr *)&dummy;
+	socklen_t my_len = sizeof(dummy);
 
-	if (po_contains(options, "clientaddr") == PO_SUCCEEDED)
+	if (po_contains(options, "clientaddr") == PO_FOUND)
 		return 1;
 
-	if (!get_client_address(saddr, &my_addr))
-		return 0;
-
-	snprintf(new_option, sizeof(new_option) - 1,
-			"clientaddr=%s", inet_ntoa(my_addr.sin_addr));
+	nfs_callback_address(sap, salen, my_addr, &my_len);
 
-	if (po_append(options, new_option) == PO_SUCCEEDED)
-		return 1;
-	return 0;
+	return nfs_append_generic_address_option(my_addr, my_len,
+							"clientaddr", options);
 }
 
 /*
@@ -339,7 +336,8 @@ static int nfs_validate_options(struct nfsmount_info *mi)
 		return 0;
 
 	if (strncmp(mi->type, "nfs4", 4) == 0) {
-		if (!append_clientaddr_option(&saddr, mi->options))
+		if (!nfs_append_clientaddr_option((struct sockaddr *)&saddr,
+						  sizeof(saddr), mi->options))
 			return 0;
 	} else {
 		if (!fix_mounthost_option(mi->options))