include/linux/sunrpc/clnt.h

   1 /*
   2  *  linux/include/linux/sunrpc/clnt.h
   3  *
   4  *  Declarations for the high-level RPC client interface
   5  *
   6  *  Copyright (C) 1995, 1996, Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifndef _LINUX_SUNRPC_CLNT_H
  10 #define _LINUX_SUNRPC_CLNT_H
  11
  12 #include <linux/socket.h>
  13 #include <linux/in.h>
  14 #include <linux/in6.h>
  15
  16 #include <linux/sunrpc/msg_prot.h>
  17 #include <linux/sunrpc/sched.h>
  18 #include <linux/sunrpc/xprt.h>
  19 #include <linux/sunrpc/auth.h>
  20 #include <linux/sunrpc/stats.h>
  21 #include <linux/sunrpc/xdr.h>
  22 #include <linux/sunrpc/timer.h>
  23 #include <asm/signal.h>
  24 #include <linux/path.h>
  25 #include <net/ipv6.h>
  26
  27 struct rpc_inode;
  28
  29 /*
  30  * The high-level client handle
  31  */
  32 struct rpc_clnt {
  33         atomic_t                cl_count;       /* Number of references */
  34         struct list_head        cl_clients;     /* Global list of clients */
  35         struct list_head        cl_tasks;       /* List of tasks */
  36         spinlock_t              cl_lock;        /* spinlock */
  37         struct rpc_xprt *       cl_xprt;        /* transport */
  38         struct rpc_procinfo *   cl_procinfo;    /* procedure info */
  39         u32                     cl_prog,        /* RPC program number */
  40                                 cl_vers,        /* RPC version number */
  41                                 cl_maxproc;     /* max procedure number */
  42
  43         char *                  cl_server;      /* server machine name */
  44         char *                  cl_protname;    /* protocol name */
  45         struct rpc_auth *       cl_auth;        /* authenticator */
  46         struct rpc_stat *       cl_stats;       /* per-program statistics */
  47         struct rpc_iostats *    cl_metrics;     /* per-client statistics */
  48
  49         unsigned int            cl_softrtry : 1,/* soft timeouts */
  50                                 cl_discrtry : 1,/* disconnect before retry */
  51                                 cl_autobind : 1,/* use getport() */
  52                                 cl_chatty   : 1;/* be verbose */
  53
  54         struct rpc_rtt *        cl_rtt;         /* RTO estimator data */
  55         const struct rpc_timeout *cl_timeout;   /* Timeout strategy */
  56
  57         int                     cl_nodelen;     /* nodename length */
  58         char                    cl_nodename[UNX_MAXNODENAME];
  59         struct path             cl_path;
  60         struct rpc_clnt *       cl_parent;      /* Points to parent of clones */
  61         struct rpc_rtt          cl_rtt_default;
  62         struct rpc_timeout      cl_timeout_default;
  63         struct rpc_program *    cl_program;
  64         char                    cl_inline_name[32];
  65         char                    *cl_principal;  /* target to authenticate to */
  66 };
  67
  68 /*
  69  * General RPC program info
  70  */
  71 #define RPC_MAXVERSION          4
  72 struct rpc_program {
  73         char *                  name;           /* protocol name */
  74         u32                     number;         /* program number */
  75         unsigned int            nrvers;         /* number of versions */
  76         struct rpc_version **   version;        /* version array */
  77         struct rpc_stat *       stats;          /* statistics */
  78         char *                  pipe_dir_name;  /* path to rpc_pipefs dir */
  79 };
  80
  81 struct rpc_version {
  82         u32                     number;         /* version number */
  83         unsigned int            nrprocs;        /* number of procs */
  84         struct rpc_procinfo *   procs;          /* procedure array */
  85 };
  86
  87 /*
  88  * Procedure information
  89  */
  90 struct rpc_procinfo {
  91         u32                     p_proc;         /* RPC procedure number */
  92         kxdreproc_t             p_encode;       /* XDR encode function */
  93         kxdrdproc_t             p_decode;       /* XDR decode function */
  94         unsigned int            p_arglen;       /* argument hdr length (u32) */
  95         unsigned int            p_replen;       /* reply hdr length (u32) */
  96         unsigned int            p_count;        /* call count */
  97         unsigned int            p_timer;        /* Which RTT timer to use */
  98         u32                     p_statidx;      /* Which procedure to account */
  99         char *                  p_name;         /* name of procedure */
 100 };
 101
 102 #ifdef __KERNEL__
 103
 104 struct rpc_create_args {
 105         struct net              *net;
 106         int                     protocol;
 107         struct sockaddr         *address;
 108         size_t                  addrsize;
 109         struct sockaddr         *saddress;
 110         const struct rpc_timeout *timeout;
 111         char                    *servername;
 112         struct rpc_program      *program;
 113         u32                     prognumber;     /* overrides program->number */
 114         u32                     version;
 115         rpc_authflavor_t        authflavor;
 116         unsigned long           flags;
 117         char                    *client_name;
 118         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 119 };
 120
 121 /* Values for "flags" field */
 122 #define RPC_CLNT_CREATE_HARDRTRY        (1UL << 0)
 123 #define RPC_CLNT_CREATE_AUTOBIND        (1UL << 2)
 124 #define RPC_CLNT_CREATE_NONPRIVPORT     (1UL << 3)
 125 #define RPC_CLNT_CREATE_NOPING          (1UL << 4)
 126 #define RPC_CLNT_CREATE_DISCRTRY        (1UL << 5)
 127 #define RPC_CLNT_CREATE_QUIET           (1UL << 6)
 128
 129 struct rpc_clnt *rpc_create(struct rpc_create_args *args);
 130 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
 131                                 struct rpc_program *, u32);
 132 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
 133 void            rpc_shutdown_client(struct rpc_clnt *);
 134 void            rpc_release_client(struct rpc_clnt *);
 135 void            rpc_task_release_client(struct rpc_task *);
 136
 137 int             rpcb_register(u32, u32, int, unsigned short);
 138 int             rpcb_v4_register(const u32 program, const u32 version,
 139                                  const struct sockaddr *address,
 140                                  const char *netid);
 141 void            rpcb_getport_async(struct rpc_task *);
 142
 143 void            rpc_call_start(struct rpc_task *);
 144 int             rpc_call_async(struct rpc_clnt *clnt,
 145                                const struct rpc_message *msg, int flags,
 146                                const struct rpc_call_ops *tk_ops,
 147                                void *calldata);
 148 int             rpc_call_sync(struct rpc_clnt *clnt,
 149                               const struct rpc_message *msg, int flags);
 150 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
 151                                int flags);
 152 int             rpc_restart_call_prepare(struct rpc_task *);
 153 int             rpc_restart_call(struct rpc_task *);
 154 void            rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
 155 size_t          rpc_max_payload(struct rpc_clnt *);
 156 void            rpc_force_rebind(struct rpc_clnt *);
 157 size_t          rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
 158 const char      *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
 159
 160 size_t          rpc_ntop(const struct sockaddr *, char *, const size_t);
 161 size_t          rpc_pton(const char *, const size_t,
 162                          struct sockaddr *, const size_t);
 163 char *          rpc_sockaddr2uaddr(const struct sockaddr *);
 164 size_t          rpc_uaddr2sockaddr(const char *, const size_t,
 165                                    struct sockaddr *, const size_t);
 166
 167 static inline unsigned short rpc_get_port(const struct sockaddr *sap)
 168 {
 169         switch (sap->sa_family) {
 170         case AF_INET:
 171                 return ntohs(((struct sockaddr_in *)sap)->sin_port);
 172         case AF_INET6:
 173                 return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
 174         }
 175         return 0;
 176 }
 177
 178 static inline void rpc_set_port(struct sockaddr *sap,
 179                                 const unsigned short port)
 180 {
 181         switch (sap->sa_family) {
 182         case AF_INET:
 183                 ((struct sockaddr_in *)sap)->sin_port = htons(port);
 184                 break;
 185         case AF_INET6:
 186                 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
 187                 break;
 188         }
 189 }
 190
 191 #define IPV6_SCOPE_DELIMITER            '%'
 192 #define IPV6_SCOPE_ID_LEN               sizeof("%nnnnnnnnnn")
 193
 194 static inline bool __rpc_cmp_addr4(const struct sockaddr *sap1,
 195                                    const struct sockaddr *sap2)
 196 {
 197         const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
 198         const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
 199
 200         return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
 201 }
 202
 203 static inline bool __rpc_copy_addr4(struct sockaddr *dst,
 204                                     const struct sockaddr *src)
 205 {
 206         const struct sockaddr_in *ssin = (struct sockaddr_in *) src;
 207         struct sockaddr_in *dsin = (struct sockaddr_in *) dst;
 208
 209         dsin->sin_family = ssin->sin_family;
 210         dsin->sin_addr.s_addr = ssin->sin_addr.s_addr;
 211         return true;
 212 }
 213
 214 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 215 static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
 216                                    const struct sockaddr *sap2)
 217 {
 218         const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
 219         const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
 220         return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
 221 }
 222
 223 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
 224                                     const struct sockaddr *src)
 225 {
 226         const struct sockaddr_in6 *ssin6 = (const struct sockaddr_in6 *) src;
 227         struct sockaddr_in6 *dsin6 = (struct sockaddr_in6 *) dst;
 228
 229         dsin6->sin6_family = ssin6->sin6_family;
 230         ipv6_addr_copy(&dsin6->sin6_addr, &ssin6->sin6_addr);
 231         return true;
 232 }
 233 #else   /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
 234 static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
 235                                    const struct sockaddr *sap2)
 236 {
 237         return false;
 238 }
 239
 240 static inline bool __rpc_copy_addr6(struct sockaddr *dst,
 241                                     const struct sockaddr *src)
 242 {
 243         return false;
 244 }
 245 #endif  /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
 246
 247 /**
 248  * rpc_cmp_addr - compare the address portion of two sockaddrs.
 249  * @sap1: first sockaddr
 250  * @sap2: second sockaddr
 251  *
 252  * Just compares the family and address portion. Ignores port, scope, etc.
 253  * Returns true if the addrs are equal, false if they aren't.
 254  */
 255 static inline bool rpc_cmp_addr(const struct sockaddr *sap1,
 256                                 const struct sockaddr *sap2)
 257 {
 258         if (sap1->sa_family == sap2->sa_family) {
 259                 switch (sap1->sa_family) {
 260                 case AF_INET:
 261                         return __rpc_cmp_addr4(sap1, sap2);
 262                 case AF_INET6:
 263                         return __rpc_cmp_addr6(sap1, sap2);
 264                 }
 265         }
 266         return false;
 267 }
 268
 269 /**
 270  * rpc_copy_addr - copy the address portion of one sockaddr to another
 271  * @dst: destination sockaddr
 272  * @src: source sockaddr
 273  *
 274  * Just copies the address portion and family. Ignores port, scope, etc.
 275  * Caller is responsible for making certain that dst is large enough to hold
 276  * the address in src. Returns true if address family is supported. Returns
 277  * false otherwise.
 278  */
 279 static inline bool rpc_copy_addr(struct sockaddr *dst,
 280                                  const struct sockaddr *src)
 281 {
 282         switch (src->sa_family) {
 283         case AF_INET:
 284                 return __rpc_copy_addr4(dst, src);
 285         case AF_INET6:
 286                 return __rpc_copy_addr6(dst, src);
 287         }
 288         return false;
 289 }
 290
 291 /**
 292  * rpc_get_scope_id - return scopeid for a given sockaddr
 293  * @sa: sockaddr to get scopeid from
 294  *
 295  * Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
 296  * not an AF_INET6 address.
 297  */
 298 static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
 299 {
 300         if (sa->sa_family != AF_INET6)
 301                 return 0;
 302
 303         return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
 304 }
 305
 306 #endif /* __KERNEL__ */
 307 #endif /* _LINUX_SUNRPC_CLNT_H */