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 <net/handshake.h>
6#include "internal.h"
7#include "nfs3_fs.h"
8#include "netns.h"
9#include "sysfs.h"
10
11#ifdef CONFIG_NFS_V3_ACL
12static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
13static const struct rpc_version *nfsacl_version[] = {
14 [3] = &nfsacl_version3,
15};
16
17const struct rpc_program nfsacl_program = {
18 .name = "nfsacl",
19 .number = NFS_ACL_PROGRAM,
20 .nrvers = ARRAY_SIZE(nfsacl_version),
21 .version = nfsacl_version,
22 .stats = &nfsacl_rpcstat,
23};
24
25/*
26 * Initialise an NFSv3 ACL client connection
27 */
28static void nfs_init_server_aclclient(struct nfs_server *server)
29{
30 if (server->flags & NFS_MOUNT_NOACL)
31 goto out_noacl;
32
33 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
34 if (IS_ERR(ptr: server->client_acl))
35 goto out_noacl;
36
37 nfs_sysfs_link_rpc_client(server, clnt: server->client_acl, NULL);
38
39 /* No errors! Assume that Sun nfsacls are supported */
40 server->caps |= NFS_CAP_ACLS;
41 return;
42
43out_noacl:
44 server->caps &= ~NFS_CAP_ACLS;
45}
46#else
47static inline void nfs_init_server_aclclient(struct nfs_server *server)
48{
49 server->flags &= ~NFS_MOUNT_NOACL;
50 server->caps &= ~NFS_CAP_ACLS;
51}
52#endif
53
54struct nfs_server *nfs3_create_server(struct fs_context *fc)
55{
56 struct nfs_server *server = nfs_create_server(fc);
57
58 /* Create a client RPC handle for the NFS v3 ACL management interface */
59 if (!IS_ERR(ptr: server))
60 nfs_init_server_aclclient(server);
61 return server;
62}
63
64struct nfs_server *nfs3_clone_server(struct nfs_server *source,
65 struct nfs_fh *fh,
66 struct nfs_fattr *fattr,
67 rpc_authflavor_t flavor)
68{
69 struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
70 if (!IS_ERR(ptr: server) && !IS_ERR(ptr: source->client_acl))
71 nfs_init_server_aclclient(server);
72 return server;
73}
74
75/*
76 * Set up a pNFS Data Server client over NFSv3.
77 *
78 * Return any existing nfs_client that matches server address,port,version
79 * and minorversion.
80 *
81 * For a new nfs_client, use a soft mount (default), a low retrans and a
82 * low timeout interval so that if a connection is lost, we retry through
83 * the MDS.
84 */
85struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
86 const struct sockaddr_storage *ds_addr, int ds_addrlen,
87 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
88{
89 struct rpc_timeout ds_timeout;
90 unsigned long connect_timeout = ds_timeo * (ds_retrans + 1) * HZ / 10;
91 struct nfs_client *mds_clp = mds_srv->nfs_client;
92 struct nfs_client_initdata cl_init = {
93 .addr = ds_addr,
94 .addrlen = ds_addrlen,
95 .nodename = mds_clp->cl_rpcclient->cl_nodename,
96 .ip_addr = mds_clp->cl_ipaddr,
97 .nfs_mod = &nfs_v3,
98 .proto = ds_proto,
99 .net = mds_clp->cl_net,
100 .timeparms = &ds_timeout,
101 .cred = mds_srv->cred,
102 .xprtsec = {
103 .policy = RPC_XPRTSEC_NONE,
104 .cert_serial = TLS_NO_CERT,
105 .privkey_serial = TLS_NO_PRIVKEY,
106 },
107 .connect_timeout = connect_timeout,
108 .reconnect_timeout = connect_timeout,
109 };
110 struct nfs_client *clp;
111 char buf[INET6_ADDRSTRLEN + 1];
112
113 /* fake a hostname because lockd wants it */
114 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
115 return ERR_PTR(error: -EINVAL);
116 cl_init.hostname = buf;
117
118 switch (ds_proto) {
119 case XPRT_TRANSPORT_TCP_TLS:
120 if (mds_clp->cl_xprtsec.policy != RPC_XPRTSEC_NONE)
121 cl_init.xprtsec = mds_clp->cl_xprtsec;
122 else
123 ds_proto = XPRT_TRANSPORT_TCP;
124 fallthrough;
125 case XPRT_TRANSPORT_RDMA:
126 case XPRT_TRANSPORT_TCP:
127 if (mds_clp->cl_nconnect > 1)
128 cl_init.nconnect = mds_clp->cl_nconnect;
129 }
130
131 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
132 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
133 if (test_bit(NFS_CS_NETUNREACH_FATAL, &mds_clp->cl_flags))
134 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags);
135
136 __set_bit(NFS_CS_DS, &cl_init.init_flags);
137
138 /* Use the MDS nfs_client cl_ipaddr. */
139 nfs_init_timeout_values(to: &ds_timeout, proto: ds_proto, timeo: ds_timeo, retrans: ds_retrans);
140 clp = nfs_get_client(&cl_init);
141
142 return clp;
143}
144EXPORT_SYMBOL_GPL(nfs3_set_ds_client);
145

source code of linux/fs/nfs/nfs3client.c