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_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         /* cl_work is only needed after cl_xpi is no longer used,
  75          * and that are of similar size
  76          */
  77         union {
  78                 struct rpc_xprt_iter    cl_xpi;
  79                 struct work_struct      cl_work;
  80         };
  81         const struct cred       *cl_cred;
  82 };
  83
  84 /*
  85  * General RPC program info
  86  */
  87 #define RPC_MAXVERSION          4
  88 struct rpc_program {
  89         const char *            name;           /* protocol name */
  90         u32                     number;         /* program number */
  91         unsigned int            nrvers;         /* number of versions */
  92         const struct rpc_version **     version;        /* version array */
  93         struct rpc_stat *       stats;          /* statistics */
  94         const char *            pipe_dir_name;  /* path to rpc_pipefs dir */
  95 };
  96
  97 struct rpc_version {
  98         u32                     number;         /* version number */
  99         unsigned int            nrprocs;        /* number of procs */
 100         const struct rpc_procinfo *procs;       /* procedure array */
 101         unsigned int            *counts;        /* call counts */
 102 };
 103
 104 /*
 105  * Procedure information
 106  */
 107 struct rpc_procinfo {
 108         u32                     p_proc;         /* RPC procedure number */
 109         kxdreproc_t             p_encode;       /* XDR encode function */
 110         kxdrdproc_t             p_decode;       /* XDR decode function */
 111         unsigned int            p_arglen;       /* argument hdr length (u32) */
 112         unsigned int            p_replen;       /* reply hdr length (u32) */
 113         unsigned int            p_timer;        /* Which RTT timer to use */
 114         u32                     p_statidx;      /* Which procedure to account */
 115         const char *            p_name;         /* name of procedure */
 116 };
 117
 118 struct rpc_create_args {
 119         struct net              *net;
 120         int                     protocol;
 121         struct sockaddr         *address;
 122         size_t                  addrsize;
 123         struct sockaddr         *saddress;
 124         const struct rpc_timeout *timeout;
 125         const char              *servername;
 126         const char              *nodename;
 127         const struct rpc_program *program;
 128         u32                     prognumber;     /* overrides program->number */
 129         u32                     version;
 130         rpc_authflavor_t        authflavor;
 131         u32                     nconnect;
 132         unsigned long           flags;
 133         char                    *client_name;
 134         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 135         const struct cred       *cred;
 136 };
 137
 138 struct rpc_add_xprt_test {
 139         void (*add_xprt_test)(struct rpc_clnt *clnt,
 140                 struct rpc_xprt *xprt,
 141                 void *calldata);
 142         void *data;
 143 };
 144
 145 /* Values for "flags" field */
 146 #define RPC_CLNT_CREATE_HARDRTRY        (1UL << 0)
 147 #define RPC_CLNT_CREATE_AUTOBIND        (1UL << 2)
 148 #define RPC_CLNT_CREATE_NONPRIVPORT     (1UL << 3)
 149 #define RPC_CLNT_CREATE_NOPING          (1UL << 4)
 150 #define RPC_CLNT_CREATE_DISCRTRY        (1UL << 5)
 151 #define RPC_CLNT_CREATE_QUIET           (1UL << 6)
 152 #define RPC_CLNT_CREATE_INFINITE_SLOTS  (1UL << 7)
 153 #define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8)
 154 #define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT      (1UL << 9)
 155 #define RPC_CLNT_CREATE_SOFTERR         (1UL << 10)
 156 #define RPC_CLNT_CREATE_REUSEPORT       (1UL << 11)
 157
 158 struct rpc_clnt *rpc_create(struct rpc_create_args *args);
 159 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
 160                                 const struct rpc_program *, u32);
 161 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
 162 struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *,
 163                                 rpc_authflavor_t);
 164 int             rpc_switch_client_transport(struct rpc_clnt *,
 165                                 struct xprt_create *,
 166                                 const struct rpc_timeout *);
 167
 168 void            rpc_shutdown_client(struct rpc_clnt *);
 169 void            rpc_release_client(struct rpc_clnt *);
 170 void            rpc_task_release_transport(struct rpc_task *);
 171 void            rpc_task_release_client(struct rpc_task *);
 172 struct rpc_xprt *rpc_task_get_xprt(struct rpc_clnt *clnt,
 173                 struct rpc_xprt *xprt);
 174
 175 int             rpcb_create_local(struct net *);
 176 void            rpcb_put_local(struct net *);
 177 int             rpcb_register(struct net *, u32, u32, int, unsigned short);
 178 int             rpcb_v4_register(struct net *net, const u32 program,
 179                                  const u32 version,
 180                                  const struct sockaddr *address,
 181                                  const char *netid);
 182 void            rpcb_getport_async(struct rpc_task *);
 183
 184 void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
 185                              unsigned int base, unsigned int len,
 186                              unsigned int hdrsize);
 187 void            rpc_call_start(struct rpc_task *);
 188 int             rpc_call_async(struct rpc_clnt *clnt,
 189                                const struct rpc_message *msg, int flags,
 190                                const struct rpc_call_ops *tk_ops,
 191                                void *calldata);
 192 int             rpc_call_sync(struct rpc_clnt *clnt,
 193                               const struct rpc_message *msg, int flags);
 194 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
 195                                int flags);
 196 int             rpc_restart_call_prepare(struct rpc_task *);
 197 int             rpc_restart_call(struct rpc_task *);
 198 void            rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
 199 struct net *    rpc_net_ns(struct rpc_clnt *);
 200 size_t          rpc_max_payload(struct rpc_clnt *);
 201 size_t          rpc_max_bc_payload(struct rpc_clnt *);
 202 unsigned int    rpc_num_bc_slots(struct rpc_clnt *);
 203 void            rpc_force_rebind(struct rpc_clnt *);
 204 size_t          rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
 205 const char      *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
 206 int             rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t);
 207
 208 int             rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
 209                         int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
 210                         void *data);
 211
 212 int             rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
 213                         struct rpc_xprt_switch *xps,
 214                         struct rpc_xprt *xprt,
 215                         void *dummy);
 216 int             rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *,
 217                         int (*setup)(struct rpc_clnt *,
 218                                 struct rpc_xprt_switch *,
 219                                 struct rpc_xprt *,
 220                                 void *),
 221                         void *data);
 222 void            rpc_set_connect_timeout(struct rpc_clnt *clnt,
 223                         unsigned long connect_timeout,
 224                         unsigned long reconnect_timeout);
 225
 226 int             rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *,
 227                         struct rpc_xprt_switch *,
 228                         struct rpc_xprt *,
 229                         void *);
 230
 231 const char *rpc_proc_name(const struct rpc_task *task);
 232
 233 void rpc_clnt_xprt_switch_put(struct rpc_clnt *);
 234 void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *);
 235 bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
 236                         const struct sockaddr *sap);
 237 void rpc_cleanup_clids(void);
 238
 239 static inline int rpc_reply_expected(struct rpc_task *task)
 240 {
 241         return (task->tk_msg.rpc_proc != NULL) &&
 242                 (task->tk_msg.rpc_proc->p_decode != NULL);
 243 }
 244
 245 static inline void rpc_task_close_connection(struct rpc_task *task)
 246 {
 247         if (task->tk_xprt)
 248                 xprt_force_disconnect(task->tk_xprt);
 249 }
 250 #endif /* _LINUX_SUNRPC_CLNT_H */