cifs: Set default Netbios RFC1001 server name to hostname in UNC

[ Upstream commit be786e509c1af9b2dcf25c3d601f05c8c251f482 ]

Windows SMB servers (including SMB2+) which are working over RFC1001
require that Netbios server name specified in RFC1001 Session Request
packet is same as the UNC host name. Netbios server name can be already
specified manually via -o servern= option.

With this change the RFC1001 server name is set automatically by extracting
the hostname from the mount source.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index 00af8dd5aa68906e57496feefc43573081440bb4..b877def5a36640445c84b1ce364981ed9430c6b7 100644 (file)
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -1118,6 +1118,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
        int i, opt;
        bool is_smb3 = !strcmp(fc->fs_type->name, "smb3");
        bool skip_parsing = false;
+       char *hostname;
 
        cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key);
 
@@ -1450,6 +1451,16 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
                        cifs_errorf(fc, "OOM when copying UNC string\n");
                        goto cifs_parse_mount_err;
                }
+               hostname = extract_hostname(ctx->UNC);
+               if (IS_ERR(hostname)) {
+                       cifs_errorf(fc, "Cannot extract hostname from UNC string\n");
+                       goto cifs_parse_mount_err;
+               }
+               /* last byte, type, is 0x20 for servr type */
+               memset(ctx->target_rfc1001_name, 0x20, RFC1001_NAME_LEN_WITH_NULL);
+               for (i = 0; i < RFC1001_NAME_LEN && hostname[i] != 0; i++)
+                       ctx->target_rfc1001_name[i] = toupper(hostname[i]);
+               kfree(hostname);
                break;
        case Opt_user:
                kfree(ctx->username);