1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/nfs_fs.h>
3#include <linux/nfs_mount.h>
4#include <linux/sunrpc/addr.h>
5#include "internal.h"
6#include "nfs3_fs.h"
7#include "netns.h"
8#include "sysfs.h"
9
10#ifdef CONFIG_NFS_V3_ACL
11static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
12static const struct rpc_version *nfsacl_version[] = {
13	[3]			= &nfsacl_version3,
14};
15
16const struct rpc_program nfsacl_program = {
17	.name			= "nfsacl",
18	.number			= NFS_ACL_PROGRAM,
19	.nrvers			= ARRAY_SIZE(nfsacl_version),
20	.version		= nfsacl_version,
21	.stats			= &nfsacl_rpcstat,
22};
23
24/*
25 * Initialise an NFSv3 ACL client connection
26 */
27static void nfs_init_server_aclclient(struct nfs_server *server)
28{
29	if (server->flags & NFS_MOUNT_NOACL)
30		goto out_noacl;
31
32	server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
33	if (IS_ERR(server->client_acl))
34		goto out_noacl;
35
36	nfs_sysfs_link_rpc_client(server, server->client_acl, NULL);
37
38	/* No errors! Assume that Sun nfsacls are supported */
39	server->caps |= NFS_CAP_ACLS;
40	return;
41
42out_noacl:
43	server->caps &= ~NFS_CAP_ACLS;
44}
45#else
46static inline void nfs_init_server_aclclient(struct nfs_server *server)
47{
48	server->flags &= ~NFS_MOUNT_NOACL;
49	server->caps &= ~NFS_CAP_ACLS;
50}
51#endif
52
53struct nfs_server *nfs3_create_server(struct fs_context *fc)
54{
55	struct nfs_server *server = nfs_create_server(fc);
56
57	/* Create a client RPC handle for the NFS v3 ACL management interface */
58	if (!IS_ERR(server))
59		nfs_init_server_aclclient(server);
60	return server;
61}
62
63struct nfs_server *nfs3_clone_server(struct nfs_server *source,
64				     struct nfs_fh *fh,
65				     struct nfs_fattr *fattr,
66				     rpc_authflavor_t flavor)
67{
68	struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
69	if (!IS_ERR(server) && !IS_ERR(source->client_acl))
70		nfs_init_server_aclclient(server);
71	return server;
72}
73
74/*
75 * Set up a pNFS Data Server client over NFSv3.
76 *
77 * Return any existing nfs_client that matches server address,port,version
78 * and minorversion.
79 *
80 * For a new nfs_client, use a soft mount (default), a low retrans and a
81 * low timeout interval so that if a connection is lost, we retry through
82 * the MDS.
83 */
84struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
85		const struct sockaddr_storage *ds_addr, int ds_addrlen,
86		int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
87{
88	struct rpc_timeout ds_timeout;
89	unsigned long connect_timeout = ds_timeo * (ds_retrans + 1) * HZ / 10;
90	struct nfs_client *mds_clp = mds_srv->nfs_client;
91	struct nfs_client_initdata cl_init = {
92		.addr = ds_addr,
93		.addrlen = ds_addrlen,
94		.nodename = mds_clp->cl_rpcclient->cl_nodename,
95		.ip_addr = mds_clp->cl_ipaddr,
96		.nfs_mod = &nfs_v3,
97		.proto = ds_proto,
98		.net = mds_clp->cl_net,
99		.timeparms = &ds_timeout,
100		.cred = mds_srv->cred,
101		.xprtsec = mds_clp->cl_xprtsec,
102		.connect_timeout = connect_timeout,
103		.reconnect_timeout = connect_timeout,
104	};
105	struct nfs_client *clp;
106	char buf[INET6_ADDRSTRLEN + 1];
107
108	/* fake a hostname because lockd wants it */
109	if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
110		return ERR_PTR(-EINVAL);
111	cl_init.hostname = buf;
112
113	switch (ds_proto) {
114	case XPRT_TRANSPORT_RDMA:
115	case XPRT_TRANSPORT_TCP:
116	case XPRT_TRANSPORT_TCP_TLS:
117		if (mds_clp->cl_nconnect > 1)
118			cl_init.nconnect = mds_clp->cl_nconnect;
119	}
120
121	if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
122		__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
123
124	__set_bit(NFS_CS_DS, &cl_init.init_flags);
125
126	/* Use the MDS nfs_client cl_ipaddr. */
127	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
128	clp = nfs_get_client(&cl_init);
129
130	return clp;
131}
132EXPORT_SYMBOL_GPL(nfs3_set_ds_client);
133