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