@@ -515,6 +515,7 @@ int nfs_create_rpc_client(struct nfs_client *clp,
 		.version	= clp->rpc_ops->version,
 		.authflavor	= flavor,
 		.cred		= cl_init->cred,
+		.xprtsec	= cl_init->xprtsec,
 	};
 
 	if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))

@@ -680,9 +681,7 @@ static int nfs_init_server(struct nfs_server *server,
 		.cred = server->cred,
 		.nconnect = ctx->nfs_server.nconnect,
 		.init_flags = (1UL << NFS_CS_REUSEPORT),
-		.xprtsec = {
-			.policy = RPC_XPRTSEC_NONE,
-		},
+		.xprtsec = ctx->xprtsec,
 	};
 	struct nfs_client *clp;
 	int error;

@@ -18,6 +18,9 @@
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
 #include <linux/nfs4_mount.h>
+
+#include <net/handshake.h>
+
 #include "nfs.h"
 #include "internal.h"
 

@@ -88,6 +91,7 @@ enum nfs_param {
 	Opt_vers,
 	Opt_wsize,
 	Opt_write,
+	Opt_xprtsec,
 };
 
 enum {

@@ -194,6 +198,7 @@ static const struct fs_parameter_spec nfs_fs_parameters[] = {
 	fsparam_string("vers",		Opt_vers),
 	fsparam_enum  ("write",		Opt_write, nfs_param_enums_write),
 	fsparam_u32   ("wsize",		Opt_wsize),
+	fsparam_string("xprtsec",	Opt_xprtsec),
 	{}
 };
 

@@ -267,6 +272,20 @@ static const struct constant_table nfs_secflavor_tokens[] = {
 	{}
 };
 
+enum {
+	Opt_xprtsec_none,
+	Opt_xprtsec_tls,
+	Opt_xprtsec_mtls,
+	nr__Opt_xprtsec
+};
+
+static const struct constant_table nfs_xprtsec_policies[] = {
+	{ "none",	Opt_xprtsec_none },
+	{ "tls",	Opt_xprtsec_tls },
+	{ "mtls",	Opt_xprtsec_mtls },
+	{}
+};
+
 /*
  * Sanity-check a server address provided by the mount command.
  *

@@ -430,6 +449,29 @@ static int nfs_parse_security_flavors(struct fs_context *fc,
 	return 0;
 }
 
+static int nfs_parse_xprtsec_policy(struct fs_context *fc,
+				    struct fs_parameter *param)
+{
+	struct nfs_fs_context *ctx = nfs_fc2context(fc);
+
+	trace_nfs_mount_assign(param->key, param->string);
+
+	switch (lookup_constant(nfs_xprtsec_policies, param->string, -1)) {
+	case Opt_xprtsec_none:
+		ctx->xprtsec.policy = RPC_XPRTSEC_NONE;
+		break;
+	case Opt_xprtsec_tls:
+		ctx->xprtsec.policy = RPC_XPRTSEC_TLS_ANON;
+		break;
+	case Opt_xprtsec_mtls:
+		ctx->xprtsec.policy = RPC_XPRTSEC_TLS_X509;
+		break;
+	default:
+		return nfs_invalf(fc, "NFS: Unrecognized transport security policy");
+	}
+	return 0;
+}
+
 static int nfs_parse_version_string(struct fs_context *fc,
 				    const char *string)
 {

@@ -696,6 +738,11 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		if (ret < 0)
 			return ret;
 		break;
+	case Opt_xprtsec:
+		ret = nfs_parse_xprtsec_policy(fc, param);
+		if (ret < 0)
+			return ret;
+		break;
 
 	case Opt_proto:
 		if (!param->string)

@@ -1574,6 +1621,9 @@ static int nfs_init_fs_context(struct fs_context *fc)
 		ctx->selected_flavor	= RPC_AUTH_MAXFLAVOR;
 		ctx->minorversion	= 0;
 		ctx->need_mount		= true;
+		ctx->xprtsec.policy	= RPC_XPRTSEC_NONE;
+		ctx->xprtsec.cert_serial	= TLS_NO_CERT;
+		ctx->xprtsec.privkey_serial	= TLS_NO_PRIVKEY;
 
 		fc->s_iflags		|= SB_I_STABLE_WRITES;
 	}

@@ -102,6 +102,7 @@ struct nfs_fs_context {
 	unsigned int		bsize;
 	struct nfs_auth_info	auth_info;
 	rpc_authflavor_t	selected_flavor;
+	struct xprtsec_parms	xprtsec;
 	char			*client_address;
 	unsigned int		version;
 	unsigned int		minorversion;

@@ -1130,9 +1130,6 @@ static int nfs4_server_common_setup(struct nfs_server *server,
 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
 {
 	struct nfs_fs_context *ctx = nfs_fc2context(fc);
-	struct xprtsec_parms xprtsec = {
-		.policy		= RPC_XPRTSEC_NONE,
-	};
 	struct rpc_timeout timeparms;
 	int error;
 

@@ -1164,7 +1161,7 @@ static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
 				ctx->nfs_server.nconnect,
 				ctx->nfs_server.max_connect,
 				fc->net_ns,
-				&xprtsec);
+				&ctx->xprtsec);
 	if (error < 0)
 		return error;
 

@@ -1323,6 +1320,7 @@ int nfs4_update_server(struct nfs_server *server, const char *hostname,
 		.dstaddr	= (struct sockaddr *)sap,
 		.addrlen	= salen,
 		.servername	= hostname,
+		/* cel: bleh. We might need to pass TLS parameters here */
 	};
 	char buf[INET6_ADDRSTRLEN + 1];
 	struct sockaddr_storage address;

@@ -59,6 +59,8 @@
 #include <linux/uaccess.h>
 #include <linux/nfs_ssc.h>
 
+#include <uapi/linux/tls.h>
+
 #include "nfs4_fs.h"
 #include "callback.h"
 #include "delegation.h"

@@ -491,6 +493,16 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
 	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
 	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
+	switch (clp->cl_xprtsec.policy) {
+	case RPC_XPRTSEC_TLS_ANON:
+		seq_puts(m, ",xprtsec=tls");
+		break;
+	case RPC_XPRTSEC_TLS_X509:
+		seq_puts(m, ",xprtsec=mtls");
+		break;
+	default:
+		break;
+	}
 
 	if (version != 4)
 		nfs_show_mountd_options(m, nfss, showdefaults);