add new fields to smb_vol to track the requested security flavor

We have this to some degree already in secFlgs, but those get "or'ed" so
there's no way to know what the last option requested was. Add new fields
that will eventually supercede the secFlgs field in the cifs_ses.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/cifsglob.h

@@ -402,6 +402,8 @@ struct smb_vol {
 	umode_t file_mode;
 	umode_t dir_mode;
 	unsigned secFlg;
+	enum securityEnum sectype; /* sectype requested via mnt opts */
+	bool sign; /* was signing requested via mnt opts? */
 	bool retry:1;
 	bool intr:1;
 	bool setuids:1;

fs/cifs/connect.c

@@ -1025,38 +1025,58 @@ static int cifs_parse_security_flavors(char *value,
 
 	substring_t args[MAX_OPT_ARGS];
 
+	/*
+	 * With mount options, the last one should win. Reset any existing
+	 * settings back to default.
+	 */
+	vol->sectype = Unspecified;
+	vol->sign = false;
+
 	switch (match_token(value, cifs_secflavor_tokens, args)) {
 	case Opt_sec_krb5:
+		vol->sectype = Kerberos;
 		vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN;
 		break;
 	case Opt_sec_krb5i:
+		vol->sectype = Kerberos;
+		vol->sign = true;
 		vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
 		break;
 	case Opt_sec_krb5p:
 		/* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
 		cifs_dbg(VFS, "Krb5 cifs privacy not supported\n");
 		break;
 	case Opt_sec_ntlmssp:
+		vol->sectype = RawNTLMSSP;
 		vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 		break;
 	case Opt_sec_ntlmsspi:
+		vol->sectype = RawNTLMSSP;
+		vol->sign = true;
 		vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
 		break;
 	case Opt_ntlm:
 		/* ntlm is default so can be turned off too */
+		vol->sectype = NTLM;
 		vol->secFlg |= CIFSSEC_MAY_NTLM;
 		break;
 	case Opt_sec_ntlmi:
+		vol->sectype = NTLM;
+		vol->sign = true;
 		vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
 		break;
 	case Opt_sec_ntlmv2:
+		vol->sectype = NTLMv2;
 		vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 		break;
 	case Opt_sec_ntlmv2i:
+		vol->sectype = NTLMv2;
+		vol->sign = true;
 		vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
 		break;
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 	case Opt_sec_lanman:
+		vol->sectype = LANMAN;
 		vol->secFlg |= CIFSSEC_MAY_LANMAN;
 		break;
 #endif
@@ -1426,6 +1446,7 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
 			break;
 		case Opt_sign:
 			vol->secFlg |= CIFSSEC_MUST_SIGN;
+			vol->sign = true;
 			break;
 		case Opt_seal:
 			/* we do not do the following in secFlags because seal
@@ -3894,6 +3915,10 @@ cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
 	case LANMAN:
 		vol->secFlg = CIFSSEC_MUST_LANMAN;
 		break;
+	default:
+		/* should never happen */
+		vol->secFlg = 0;
+		break;
 	}
 
 	return cifs_set_cifscreds(vol, ses);