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 #include <linux/refcount.h> 18 19 #include <linux/sunrpc/msg_prot.h> 20 #include <linux/sunrpc/sched.h> 21 #include <linux/sunrpc/xprt.h> 22 #include <linux/sunrpc/auth.h> 23 #include <linux/sunrpc/stats.h> 24 #include <linux/sunrpc/xdr.h> 25 #include <linux/sunrpc/timer.h> 26 #include <linux/sunrpc/rpc_pipe_fs.h> 27 #include <asm/signal.h> 28 #include <linux/path.h> 29 #include <net/ipv6.h> 30 #include <linux/sunrpc/xprtmultipath.h> 31 32 struct rpc_inode; 33 struct rpc_sysfs_client { 34 struct kobject kobject; 35 struct net *net; 36 struct rpc_clnt *clnt; 37 struct rpc_xprt_switch *xprt_switch; 38 }; 39 40 41 /* 42 * The high-level client handle 43 */ 44 struct rpc_clnt { 45 refcount_t cl_count; /* Number of references */ 46 unsigned int cl_clid; /* client id */ 47 struct list_head cl_clients; /* Global list of clients */ 48 struct list_head cl_tasks; /* List of tasks */ 49 atomic_t cl_pid; /* task PID counter */ 50 spinlock_t cl_lock; /* spinlock */ 51 struct rpc_xprt __rcu * cl_xprt; /* transport */ 52 const struct rpc_procinfo *cl_procinfo; /* procedure info */ 53 u32 cl_prog, /* RPC program number */ 54 cl_vers, /* RPC version number */ 55 cl_maxproc; /* max procedure number */ 56 57 struct rpc_auth * cl_auth; /* authenticator */ 58 struct rpc_stat * cl_stats; /* per-program statistics */ 59 struct rpc_iostats * cl_metrics; /* per-client statistics */ 60 61 unsigned int cl_softrtry : 1,/* soft timeouts */ 62 cl_softerr : 1,/* Timeouts return errors */ 63 cl_discrtry : 1,/* disconnect before retry */ 64 cl_noretranstimeo: 1,/* No retransmit timeouts */ 65 cl_autobind : 1,/* use getport() */ 66 cl_chatty : 1,/* be verbose */ 67 cl_shutdown : 1;/* rpc immediate -EIO */ 68 struct xprtsec_parms cl_xprtsec; /* transport security policy */ 69 70 struct rpc_rtt * cl_rtt; /* RTO estimator data */ 71 const struct rpc_timeout *cl_timeout; /* Timeout strategy */ 72 73 atomic_t cl_swapper; /* swapfile count */ 74 int cl_nodelen; /* nodename length */ 75 char cl_nodename[UNX_MAXNODENAME+1]; 76 struct rpc_pipe_dir_head cl_pipedir_objects; 77 struct rpc_clnt * cl_parent; /* Points to parent of clones */ 78 struct rpc_rtt cl_rtt_default; 79 struct rpc_timeout cl_timeout_default; 80 const struct rpc_program *cl_program; 81 const char * cl_principal; /* use for machine cred */ 82 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 83 struct dentry *cl_debugfs; /* debugfs directory */ 84 #endif 85 struct rpc_sysfs_client *cl_sysfs; /* sysfs directory */ 86 /* cl_work is only needed after cl_xpi is no longer used, 87 * and that are of similar size 88 */ 89 union { 90 struct rpc_xprt_iter cl_xpi; 91 struct work_struct cl_work; 92 }; 93 const struct cred *cl_cred; 94 unsigned int cl_max_connect; /* max number of transports not to the same IP */ 95 struct super_block *pipefs_sb; 96 }; 97 98 /* 99 * General RPC program info 100 */ 101 #define RPC_MAXVERSION 4 102 struct rpc_program { 103 const char * name; /* protocol name */ 104 u32 number; /* program number */ 105 unsigned int nrvers; /* number of versions */ 106 const struct rpc_version ** version; /* version array */ 107 struct rpc_stat * stats; /* statistics */ 108 const char * pipe_dir_name; /* path to rpc_pipefs dir */ 109 }; 110 111 struct rpc_version { 112 u32 number; /* version number */ 113 unsigned int nrprocs; /* number of procs */ 114 const struct rpc_procinfo *procs; /* procedure array */ 115 unsigned int *counts; /* call counts */ 116 }; 117 118 /* 119 * Procedure information 120 */ 121 struct rpc_procinfo { 122 u32 p_proc; /* RPC procedure number */ 123 kxdreproc_t p_encode; /* XDR encode function */ 124 kxdrdproc_t p_decode; /* XDR decode function */ 125 unsigned int p_arglen; /* argument hdr length (u32) */ 126 unsigned int p_replen; /* reply hdr length (u32) */ 127 unsigned int p_timer; /* Which RTT timer to use */ 128 u32 p_statidx; /* Which procedure to account */ 129 const char * p_name; /* name of procedure */ 130 }; 131 132 struct rpc_create_args { 133 struct net *net; 134 int protocol; 135 struct sockaddr *address; 136 size_t addrsize; 137 struct sockaddr *saddress; 138 const struct rpc_timeout *timeout; 139 const char *servername; 140 const char *nodename; 141 const struct rpc_program *program; 142 u32 prognumber; /* overrides program->number */ 143 u32 version; 144 rpc_authflavor_t authflavor; 145 u32 nconnect; 146 unsigned long flags; 147 char *client_name; 148 struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ 149 const struct cred *cred; 150 unsigned int max_connect; 151 struct xprtsec_parms xprtsec; 152 unsigned long connect_timeout; 153 unsigned long reconnect_timeout; 154 }; 155 156 struct rpc_add_xprt_test { 157 void (*add_xprt_test)(struct rpc_clnt *clnt, 158 struct rpc_xprt *xprt, 159 void *calldata); 160 void *data; 161 }; 162 163 /* Values for "flags" field */ 164 #define RPC_CLNT_CREATE_HARDRTRY (1UL << 0) 165 #define RPC_CLNT_CREATE_AUTOBIND (1UL << 2) 166 #define RPC_CLNT_CREATE_NONPRIVPORT (1UL << 3) 167 #define RPC_CLNT_CREATE_NOPING (1UL << 4) 168 #define RPC_CLNT_CREATE_DISCRTRY (1UL << 5) 169 #define RPC_CLNT_CREATE_QUIET (1UL << 6) 170 #define RPC_CLNT_CREATE_INFINITE_SLOTS (1UL << 7) 171 #define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8) 172 #define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT (1UL << 9) 173 #define RPC_CLNT_CREATE_SOFTERR (1UL << 10) 174 #define RPC_CLNT_CREATE_REUSEPORT (1UL << 11) 175 #define RPC_CLNT_CREATE_CONNECTED (1UL << 12) 176 177 struct rpc_clnt *rpc_create(struct rpc_create_args *args); 178 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *, 179 const struct rpc_program *, u32); 180 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *); 181 struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *, 182 rpc_authflavor_t); 183 int rpc_switch_client_transport(struct rpc_clnt *, 184 struct xprt_create *, 185 const struct rpc_timeout *); 186 187 void rpc_shutdown_client(struct rpc_clnt *); 188 void rpc_release_client(struct rpc_clnt *); 189 void rpc_task_release_transport(struct rpc_task *); 190 void rpc_task_release_client(struct rpc_task *); 191 struct rpc_xprt *rpc_task_get_xprt(struct rpc_clnt *clnt, 192 struct rpc_xprt *xprt); 193 194 int rpcb_create_local(struct net *); 195 void rpcb_put_local(struct net *); 196 int rpcb_register(struct net *, u32, u32, int, unsigned short); 197 int rpcb_v4_register(struct net *net, const u32 program, 198 const u32 version, 199 const struct sockaddr *address, 200 const char *netid); 201 void rpcb_getport_async(struct rpc_task *); 202 203 void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages, 204 unsigned int base, unsigned int len, 205 unsigned int hdrsize); 206 void rpc_call_start(struct rpc_task *); 207 int rpc_call_async(struct rpc_clnt *clnt, 208 const struct rpc_message *msg, int flags, 209 const struct rpc_call_ops *tk_ops, 210 void *calldata); 211 int rpc_call_sync(struct rpc_clnt *clnt, 212 const struct rpc_message *msg, int flags); 213 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, 214 int flags); 215 int rpc_restart_call_prepare(struct rpc_task *); 216 int rpc_restart_call(struct rpc_task *); 217 void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int); 218 struct net * rpc_net_ns(struct rpc_clnt *); 219 size_t rpc_max_payload(struct rpc_clnt *); 220 size_t rpc_max_bc_payload(struct rpc_clnt *); 221 unsigned int rpc_num_bc_slots(struct rpc_clnt *); 222 void rpc_force_rebind(struct rpc_clnt *); 223 size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t); 224 const char *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t); 225 int rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t); 226 227 int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt, 228 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *), 229 void *data); 230 231 int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, 232 struct rpc_xprt_switch *xps, 233 struct rpc_xprt *xprt, 234 void *dummy); 235 int rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *, 236 int (*setup)(struct rpc_clnt *, 237 struct rpc_xprt_switch *, 238 struct rpc_xprt *, 239 void *), 240 void *data); 241 void rpc_set_connect_timeout(struct rpc_clnt *clnt, 242 unsigned long connect_timeout, 243 unsigned long reconnect_timeout); 244 245 int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *, 246 struct rpc_xprt_switch *, 247 struct rpc_xprt *, 248 void *); 249 void rpc_clnt_manage_trunked_xprts(struct rpc_clnt *); 250 void rpc_clnt_probe_trunked_xprts(struct rpc_clnt *, 251 struct rpc_add_xprt_test *); 252 253 const char *rpc_proc_name(const struct rpc_task *task); 254 255 void rpc_clnt_xprt_switch_put(struct rpc_clnt *); 256 void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *); 257 void rpc_clnt_xprt_switch_remove_xprt(struct rpc_clnt *, struct rpc_xprt *); 258 bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt, 259 const struct sockaddr *sap); 260 void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt); 261 void rpc_clnt_disconnect(struct rpc_clnt *clnt); 262 void rpc_cleanup_clids(void); 263 264 static inline int rpc_reply_expected(struct rpc_task *task) 265 { 266 return (task->tk_msg.rpc_proc != NULL) && 267 (task->tk_msg.rpc_proc->p_decode != NULL); 268 } 269 270 static inline void rpc_task_close_connection(struct rpc_task *task) 271 { 272 if (task->tk_xprt) 273 xprt_force_disconnect(task->tk_xprt); 274 } 275 #endif /* _LINUX_SUNRPC_CLNT_H */ 276