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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/include/linux/sunrpc/clnt.h
4 *
5 * Declarations for the high-level RPC client interface
6 *
7 * Copyright (C) 1995, 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10#ifndef _LINUX_SUNRPC_CLNT_H
11#define _LINUX_SUNRPC_CLNT_H
12
13#include <linux/types.h>
14#include <linux/socket.h>
15#include <linux/in.h>
16#include <linux/in6.h>
17
18#include <linux/sunrpc/msg_prot.h>
19#include <linux/sunrpc/sched.h>
20#include <linux/sunrpc/xprt.h>
21#include <linux/sunrpc/auth.h>
22#include <linux/sunrpc/stats.h>
23#include <linux/sunrpc/xdr.h>
24#include <linux/sunrpc/timer.h>
25#include <linux/sunrpc/rpc_pipe_fs.h>
26#include <asm/signal.h>
27#include <linux/path.h>
28#include <net/ipv6.h>
29#include <linux/sunrpc/xprtmultipath.h>
30
31struct rpc_inode;
32
33/*
34 * The high-level client handle
35 */
36struct rpc_clnt {
37 atomic_t cl_count; /* Number of references */
38 unsigned int cl_clid; /* client id */
39 struct list_head cl_clients; /* Global list of clients */
40 struct list_head cl_tasks; /* List of tasks */
41 spinlock_t cl_lock; /* spinlock */
42 struct rpc_xprt __rcu * cl_xprt; /* transport */
43 const struct rpc_procinfo *cl_procinfo; /* procedure info */
44 u32 cl_prog, /* RPC program number */
45 cl_vers, /* RPC version number */
46 cl_maxproc; /* max procedure number */
47
48 struct rpc_auth * cl_auth; /* authenticator */
49 struct rpc_stat * cl_stats; /* per-program statistics */
50 struct rpc_iostats * cl_metrics; /* per-client statistics */
51
52 unsigned int cl_softrtry : 1,/* soft timeouts */
53 cl_softerr : 1,/* Timeouts return errors */
54 cl_discrtry : 1,/* disconnect before retry */
55 cl_noretranstimeo: 1,/* No retransmit timeouts */
56 cl_autobind : 1,/* use getport() */
57 cl_chatty : 1;/* be verbose */
58
59 struct rpc_rtt * cl_rtt; /* RTO estimator data */
60 const struct rpc_timeout *cl_timeout; /* Timeout strategy */
61
62 atomic_t cl_swapper; /* swapfile count */
63 int cl_nodelen; /* nodename length */
64 char cl_nodename[UNX_MAXNODENAME+1];
65 struct rpc_pipe_dir_head cl_pipedir_objects;
66 struct rpc_clnt * cl_parent; /* Points to parent of clones */
67 struct rpc_rtt cl_rtt_default;
68 struct rpc_timeout cl_timeout_default;
69 const struct rpc_program *cl_program;
70 const char * cl_principal; /* use for machine cred */
71#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
72 struct dentry *cl_debugfs; /* debugfs directory */
73#endif
74 struct rpc_xprt_iter cl_xpi;
75 const struct cred *cl_cred;
76};
77
78/*
79 * General RPC program info
80 */
81#define RPC_MAXVERSION 4
82struct rpc_program {
83 const char * name; /* protocol name */
84 u32 number; /* program number */
85 unsigned int nrvers; /* number of versions */
86 const struct rpc_version ** version; /* version array */
87 struct rpc_stat * stats; /* statistics */
88 const char * pipe_dir_name; /* path to rpc_pipefs dir */
89};
90
91struct rpc_version {
92 u32 number; /* version number */
93 unsigned int nrprocs; /* number of procs */
94 const struct rpc_procinfo *procs; /* procedure array */
95 unsigned int *counts; /* call counts */
96};
97
98/*
99 * Procedure information
100 */
101struct rpc_procinfo {
102 u32 p_proc; /* RPC procedure number */
103 kxdreproc_t p_encode; /* XDR encode function */
104 kxdrdproc_t p_decode; /* XDR decode function */
105 unsigned int p_arglen; /* argument hdr length (u32) */
106 unsigned int p_replen; /* reply hdr length (u32) */
107 unsigned int p_timer; /* Which RTT timer to use */
108 u32 p_statidx; /* Which procedure to account */
109 const char * p_name; /* name of procedure */
110};
111
112#ifdef __KERNEL__
113
114struct rpc_create_args {
115 struct net *net;
116 int protocol;
117 struct sockaddr *address;
118 size_t addrsize;
119 struct sockaddr *saddress;
120 const struct rpc_timeout *timeout;
121 const char *servername;
122 const char *nodename;
123 const struct rpc_program *program;
124 u32 prognumber; /* overrides program->number */
125 u32 version;
126 rpc_authflavor_t authflavor;
127 unsigned long flags;
128 char *client_name;
129 struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
130 const struct cred *cred;
131};
132
133struct rpc_add_xprt_test {
134 void (*add_xprt_test)(struct rpc_clnt *clnt,
135 struct rpc_xprt *xprt,
136 void *calldata);
137 void *data;
138};
139
140/* Values for "flags" field */
141#define RPC_CLNT_CREATE_HARDRTRY (1UL << 0)
142#define RPC_CLNT_CREATE_AUTOBIND (1UL << 2)
143#define RPC_CLNT_CREATE_NONPRIVPORT (1UL << 3)
144#define RPC_CLNT_CREATE_NOPING (1UL << 4)
145#define RPC_CLNT_CREATE_DISCRTRY (1UL << 5)
146#define RPC_CLNT_CREATE_QUIET (1UL << 6)
147#define RPC_CLNT_CREATE_INFINITE_SLOTS (1UL << 7)
148#define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8)
149#define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT (1UL << 9)
150#define RPC_CLNT_CREATE_SOFTERR (1UL << 10)
151
152struct rpc_clnt *rpc_create(struct rpc_create_args *args);
153struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
154 const struct rpc_program *, u32);
155struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
156struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *,
157 rpc_authflavor_t);
158int rpc_switch_client_transport(struct rpc_clnt *,
159 struct xprt_create *,
160 const struct rpc_timeout *);
161
162void rpc_shutdown_client(struct rpc_clnt *);
163void rpc_release_client(struct rpc_clnt *);
164void rpc_task_release_transport(struct rpc_task *);
165void rpc_task_release_client(struct rpc_task *);
166
167int rpcb_create_local(struct net *);
168void rpcb_put_local(struct net *);
169int rpcb_register(struct net *, u32, u32, int, unsigned short);
170int rpcb_v4_register(struct net *net, const u32 program,
171 const u32 version,
172 const struct sockaddr *address,
173 const char *netid);
174void rpcb_getport_async(struct rpc_task *);
175
176void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
177 unsigned int base, unsigned int len,
178 unsigned int hdrsize);
179void rpc_call_start(struct rpc_task *);
180int rpc_call_async(struct rpc_clnt *clnt,
181 const struct rpc_message *msg, int flags,
182 const struct rpc_call_ops *tk_ops,
183 void *calldata);
184int rpc_call_sync(struct rpc_clnt *clnt,
185 const struct rpc_message *msg, int flags);
186struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
187 int flags);
188int rpc_restart_call_prepare(struct rpc_task *);
189int rpc_restart_call(struct rpc_task *);
190void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
191struct net * rpc_net_ns(struct rpc_clnt *);
192size_t rpc_max_payload(struct rpc_clnt *);
193size_t rpc_max_bc_payload(struct rpc_clnt *);
194void rpc_force_rebind(struct rpc_clnt *);
195size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
196const char *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
197int rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t);
198
199int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
200 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
201 void *data);
202
203int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
204 struct rpc_xprt_switch *xps,
205 struct rpc_xprt *xprt,
206 void *dummy);
207int rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *,
208 int (*setup)(struct rpc_clnt *,
209 struct rpc_xprt_switch *,
210 struct rpc_xprt *,
211 void *),
212 void *data);
213void rpc_set_connect_timeout(struct rpc_clnt *clnt,
214 unsigned long connect_timeout,
215 unsigned long reconnect_timeout);
216
217int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *,
218 struct rpc_xprt_switch *,
219 struct rpc_xprt *,
220 void *);
221
222const char *rpc_proc_name(const struct rpc_task *task);
223
224void rpc_clnt_xprt_switch_put(struct rpc_clnt *);
225void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *);
226bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
227 const struct sockaddr *sap);
228void rpc_cleanup_clids(void);
229
230static inline int rpc_reply_expected(struct rpc_task *task)
231{
232 return (task->tk_msg.rpc_proc != NULL) &&
233 (task->tk_msg.rpc_proc->p_decode != NULL);
234}
235
236#endif /* __KERNEL__ */
237#endif /* _LINUX_SUNRPC_CLNT_H */