include/linux/sunrpc/clnt.h

   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
  31 struct rpc_inode;
  32
  33 /*
  34  * The high-level client handle
  35  */
  36 struct 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_discrtry : 1,/* disconnect before retry */
  54                                 cl_noretranstimeo: 1,/* No retransmit timeouts */
  55                                 cl_autobind : 1,/* use getport() */
  56                                 cl_chatty   : 1;/* be verbose */
  57
  58         struct rpc_rtt *        cl_rtt;         /* RTO estimator data */
  59         const struct rpc_timeout *cl_timeout;   /* Timeout strategy */
  60
  61         atomic_t                cl_swapper;     /* swapfile count */
  62         int                     cl_nodelen;     /* nodename length */
  63         char                    cl_nodename[UNX_MAXNODENAME+1];
  64         struct rpc_pipe_dir_head cl_pipedir_objects;
  65         struct rpc_clnt *       cl_parent;      /* Points to parent of clones */
  66         struct rpc_rtt          cl_rtt_default;
  67         struct rpc_timeout      cl_timeout_default;
  68         const struct rpc_program *cl_program;
  69         const char *            cl_principal;   /* use for machine cred */
  70 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
  71         struct dentry           *cl_debugfs;    /* debugfs directory */
  72 #endif
  73         struct rpc_xprt_iter    cl_xpi;
  74 };
  75
  76 /*
  77  * General RPC program info
  78  */
  79 #define RPC_MAXVERSION          4
  80 struct rpc_program {
  81         const char *            name;           /* protocol name */
  82         u32                     number;         /* program number */
  83         unsigned int            nrvers;         /* number of versions */
  84         const struct rpc_version **     version;        /* version array */
  85         struct rpc_stat *       stats;          /* statistics */
  86         const char *            pipe_dir_name;  /* path to rpc_pipefs dir */
  87 };
  88
  89 struct rpc_version {
  90         u32                     number;         /* version number */
  91         unsigned int            nrprocs;        /* number of procs */
  92         const struct rpc_procinfo *procs;       /* procedure array */
  93         unsigned int            *counts;        /* call counts */
  94 };
  95
  96 /*
  97  * Procedure information
  98  */
  99 struct rpc_procinfo {
 100         u32                     p_proc;         /* RPC procedure number */
 101         kxdreproc_t             p_encode;       /* XDR encode function */
 102         kxdrdproc_t             p_decode;       /* XDR decode function */
 103         unsigned int            p_arglen;       /* argument hdr length (u32) */
 104         unsigned int            p_replen;       /* reply hdr length (u32) */
 105         unsigned int            p_timer;        /* Which RTT timer to use */
 106         u32                     p_statidx;      /* Which procedure to account */
 107         const char *            p_name;         /* name of procedure */
 108 };
 109
 110 #ifdef __KERNEL__
 111
 112 struct rpc_create_args {
 113         struct net              *net;
 114         int                     protocol;
 115         struct sockaddr         *address;
 116         size_t                  addrsize;
 117         struct sockaddr         *saddress;
 118         const struct rpc_timeout *timeout;
 119         const char              *servername;
 120         const char              *nodename;
 121         const struct rpc_program *program;
 122         u32                     prognumber;     /* overrides program->number */
 123         u32                     version;
 124         rpc_authflavor_t        authflavor;
 125         unsigned long           flags;
 126         char                    *client_name;
 127         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 128 };
 129
 130 struct rpc_add_xprt_test {
 131         void (*add_xprt_test)(struct rpc_clnt *clnt,
 132                 struct rpc_xprt *xprt,
 133                 void *calldata);
 134         void *data;
 135 };
 136
 137 /* Values for "flags" field */
 138 #define RPC_CLNT_CREATE_HARDRTRY        (1UL << 0)
 139 #define RPC_CLNT_CREATE_AUTOBIND        (1UL << 2)
 140 #define RPC_CLNT_CREATE_NONPRIVPORT     (1UL << 3)
 141 #define RPC_CLNT_CREATE_NOPING          (1UL << 4)
 142 #define RPC_CLNT_CREATE_DISCRTRY        (1UL << 5)
 143 #define RPC_CLNT_CREATE_QUIET           (1UL << 6)
 144 #define RPC_CLNT_CREATE_INFINITE_SLOTS  (1UL << 7)
 145 #define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8)
 146 #define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT      (1UL << 9)
 147
 148 struct rpc_clnt *rpc_create(struct rpc_create_args *args);
 149 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
 150                                 const struct rpc_program *, u32);
 151 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
 152 struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *,
 153                                 rpc_authflavor_t);
 154 int             rpc_switch_client_transport(struct rpc_clnt *,
 155                                 struct xprt_create *,
 156                                 const struct rpc_timeout *);
 157
 158 void            rpc_shutdown_client(struct rpc_clnt *);
 159 void            rpc_release_client(struct rpc_clnt *);
 160 void            rpc_task_release_transport(struct rpc_task *);
 161 void            rpc_task_release_client(struct rpc_task *);
 162
 163 int             rpcb_create_local(struct net *);
 164 void            rpcb_put_local(struct net *);
 165 int             rpcb_register(struct net *, u32, u32, int, unsigned short);
 166 int             rpcb_v4_register(struct net *net, const u32 program,
 167                                  const u32 version,
 168                                  const struct sockaddr *address,
 169                                  const char *netid);
 170 void            rpcb_getport_async(struct rpc_task *);
 171
 172 void            rpc_call_start(struct rpc_task *);
 173 int             rpc_call_async(struct rpc_clnt *clnt,
 174                                const struct rpc_message *msg, int flags,
 175                                const struct rpc_call_ops *tk_ops,
 176                                void *calldata);
 177 int             rpc_call_sync(struct rpc_clnt *clnt,
 178                               const struct rpc_message *msg, int flags);
 179 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
 180                                int flags);
 181 int             rpc_restart_call_prepare(struct rpc_task *);
 182 int             rpc_restart_call(struct rpc_task *);
 183 void            rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
 184 struct net *    rpc_net_ns(struct rpc_clnt *);
 185 size_t          rpc_max_payload(struct rpc_clnt *);
 186 size_t          rpc_max_bc_payload(struct rpc_clnt *);
 187 void            rpc_force_rebind(struct rpc_clnt *);
 188 size_t          rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
 189 const char      *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
 190 int             rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t);
 191
 192 int             rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
 193                         int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
 194                         void *data);
 195
 196 int             rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
 197                         struct rpc_xprt_switch *xps,
 198                         struct rpc_xprt *xprt,
 199                         void *dummy);
 200 int             rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *,
 201                         int (*setup)(struct rpc_clnt *,
 202                                 struct rpc_xprt_switch *,
 203                                 struct rpc_xprt *,
 204                                 void *),
 205                         void *data);
 206 void            rpc_set_connect_timeout(struct rpc_clnt *clnt,
 207                         unsigned long connect_timeout,
 208                         unsigned long reconnect_timeout);
 209
 210 int             rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *,
 211                         struct rpc_xprt_switch *,
 212                         struct rpc_xprt *,
 213                         void *);
 214
 215 const char *rpc_proc_name(const struct rpc_task *task);
 216
 217 void rpc_clnt_xprt_switch_put(struct rpc_clnt *);
 218 void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *);
 219 bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
 220                         const struct sockaddr *sap);
 221 void rpc_cleanup_clids(void);
 222
 223 static inline int rpc_reply_expected(struct rpc_task *task)
 224 {
 225         return (task->tk_msg.rpc_proc != NULL) &&
 226                 (task->tk_msg.rpc_proc->p_decode != NULL);
 227 }
 228
 229 #endif /* __KERNEL__ */
 230 #endif /* _LINUX_SUNRPC_CLNT_H */