bsd/nfs/krpc_subr.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1994 Gordon Ross, Adam Glass
  25  * Copyright (c) 1992 Regents of the University of California.
  26  * All rights reserved.
  27  *
  28  * This software was developed by the Computer Systems Engineering group
  29  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  30  * contributed to Berkeley.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Lawrence Berkeley Laboratory and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  */
  61
  62 #include <sys/param.h>
  63 #include <sys/conf.h>
  64 #include <sys/ioctl.h>
  65 #include <sys/proc.h>
  66 #include <sys/mount.h>
  67 #include <sys/mbuf.h>
  68 #include <sys/malloc.h>
  69 #include <sys/socket.h>
  70 #include <sys/socketvar.h>
  71 #include <sys/systm.h>
  72 #include <sys/reboot.h>
  73
  74 #include <net/if.h>
  75 #include <netinet/in.h>
  76
  77 #include <nfs/rpcv2.h>
  78 #include <nfs/krpc.h>
  79
  80 /*
  81  * Kernel support for Sun RPC
  82  *
  83  * Used currently for bootstrapping in nfs diskless configurations.
  84  *
  85  * Note: will not work on variable-sized rpc args/results.
  86  *       implicit size-limit of an mbuf.
  87  */
  88
  89 /*
  90  * Generic RPC headers
  91  */
  92
  93 struct auth_info {
  94         u_int32_t       rp_atype;       /* auth type */
  95         u_int32_t       rp_alen;        /* auth length */
  96 };
  97
  98 struct rpc_call {
  99         u_int32_t       rp_xid;         /* request transaction id */
 100         int32_t         rp_direction;   /* call direction (0) */
 101         u_int32_t       rp_rpcvers;     /* rpc version (2) */
 102         u_int32_t       rp_prog;        /* program */
 103         u_int32_t       rp_vers;        /* version */
 104         u_int32_t       rp_proc;        /* procedure */
 105         struct  auth_info rp_auth;
 106         struct  auth_info rp_verf;
 107 };
 108
 109 struct rpc_reply {
 110         u_int32_t rp_xid;               /* request transaction id */
 111         int32_t  rp_direction;          /* call direction (1) */
 112         int32_t  rp_astatus;            /* accept status (0: accepted) */
 113         union {
 114                 u_int32_t rpu_errno;
 115                 struct {
 116                         struct auth_info rp_auth;
 117                         u_int32_t       rp_rstatus;
 118                 } rpu_ok;
 119         } rp_u;
 120 };
 121
 122 #define MIN_REPLY_HDR 16        /* xid, dir, astat, errno */
 123
 124 /*
 125  * What is the longest we will wait before re-sending a request?
 126  * Note this is also the frequency of "RPC timeout" messages.
 127  * The re-send loop count sup linearly to this maximum, so the
 128  * first complaint will happen after (1+2+3+4+5)=15 seconds.
 129  */
 130 #define MAX_RESEND_DELAY 5      /* seconds */
 131
 132 /* copied over from nfs_boot.c for printf format. could put in .h file... */
 133 #define IP_FORMAT       "%d.%d.%d.%d"
 134 #define IP_CH(ip)       ((u_char *)ip)
 135 #define IP_LIST(ip)     IP_CH(ip)[0],IP_CH(ip)[1],IP_CH(ip)[2],IP_CH(ip)[3]
 136
 137
 138 /*
 139  * Call portmap to lookup a port number for a particular rpc program
 140  * Returns non-zero error on failure.
 141  */
 142 int
 143 krpc_portmap(sin,  prog, vers, portp)
 144         struct sockaddr_in *sin;                /* server address */
 145         u_int prog, vers;       /* host order */
 146         u_int16_t *portp;       /* network order */
 147 {
 148         struct sdata {
 149                 u_int32_t prog;         /* call program */
 150                 u_int32_t vers;         /* call version */
 151                 u_int32_t proto;        /* call protocol */
 152                 u_int32_t port;         /* call port (unused) */
 153         } *sdata;
 154         struct rdata {
 155                 u_int16_t pad;
 156                 u_int16_t port;
 157         } *rdata;
 158         struct mbuf *m;
 159         int error;
 160
 161         /* The portmapper port is fixed. */
 162         if (prog == PMAPPROG) {
 163                 *portp = htons(PMAPPORT);
 164                 return 0;
 165         }
 166
 167         m = m_gethdr(M_WAIT, MT_DATA);
 168         if (m == NULL)
 169                 return ENOBUFS;
 170         m->m_len = sizeof(*sdata);
 171         m->m_pkthdr.len = m->m_len;
 172         sdata = mtod(m, struct sdata *);
 173
 174         /* Do the RPC to get it. */
 175         sdata->prog = htonl(prog);
 176         sdata->vers = htonl(vers);
 177         sdata->proto = htonl(IPPROTO_UDP);
 178         sdata->port = 0;
 179
 180         sin->sin_port = htons(PMAPPORT);
 181         error = krpc_call(sin, PMAPPROG, PMAPVERS,
 182                                           PMAPPROC_GETPORT, &m, NULL);
 183         if (error)
 184                 return error;
 185
 186         rdata = mtod(m, struct rdata *);
 187         *portp = rdata->port;
 188
 189         m_freem(m);
 190         return 0;
 191 }
 192
 193 /*
 194  * Do a remote procedure call (RPC) and wait for its reply.
 195  * If from_p is non-null, then we are doing broadcast, and
 196  * the address from whence the response came is saved there.
 197  */
 198 int
 199 krpc_call(sa, prog, vers, func, data, from_p)
 200         struct sockaddr_in *sa;
 201         u_int prog, vers, func;
 202         struct mbuf **data;     /* input/output */
 203         struct sockaddr_in **from_p;    /* output */
 204 {
 205         struct socket *so;
 206         struct sockaddr_in *sin;
 207         struct mbuf *m, *nam, *mhead, *mhck;
 208         struct rpc_call *call;
 209         struct rpc_reply *reply;
 210         struct uio auio;
 211         int error, rcvflg, timo, secs, len;
 212         static u_int32_t xid = ~0xFF;
 213         u_int16_t tport;
 214         struct sockopt sopt;
 215
 216         /*
 217          * Validate address family.
 218          * Sorry, this is INET specific...
 219          */
 220         if (sa->sin_family != AF_INET)
 221                 return (EAFNOSUPPORT);
 222
 223         /* Free at end if not null. */
 224         nam = mhead = NULL;
 225         if (from_p)
 226             *from_p = 0;
 227
 228         /*
 229          * Create socket and set its recieve timeout.
 230          */
 231         if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)))
 232                 goto out;
 233
 234         {
 235                 struct timeval tv;
 236
 237                 tv.tv_sec = 1;
 238                 tv.tv_usec = 0;
 239                 bzero(&sopt, sizeof sopt);
 240                 sopt.sopt_level = SOL_SOCKET;
 241                 sopt.sopt_name = SO_RCVTIMEO;
 242                 sopt.sopt_val = &tv;
 243                 sopt.sopt_valsize = sizeof tv;
 244
 245                 if (error = sosetopt(so, &sopt))
 246                     goto out;
 247
 248         }
 249
 250         /*
 251          * Enable broadcast if necessary.
 252          */
 253
 254         if (from_p) {
 255                 int on = 1;
 256                 sopt.sopt_name = SO_BROADCAST;
 257                 sopt.sopt_val = &on;
 258                 sopt.sopt_valsize = sizeof on;
 259                 if (error = sosetopt(so, &sopt))
 260                         goto out;
 261         }
 262
 263         /*
 264          * Bind the local endpoint to a reserved port,
 265          * because some NFS servers refuse requests from
 266          * non-reserved (non-privileged) ports.
 267          */
 268         m = m_getclr(M_WAIT, MT_SONAME);
 269         sin = mtod(m, struct sockaddr_in *);
 270         sin->sin_len = m->m_len = sizeof(*sin);
 271         sin->sin_family = AF_INET;
 272         sin->sin_addr.s_addr = INADDR_ANY;
 273         tport = IPPORT_RESERVED;
 274         do {
 275                 tport--;
 276                 sin->sin_port = htons(tport);
 277                 error = sobind(so, mtod(m, struct sockaddr *));
 278         } while (error == EADDRINUSE &&
 279                          tport > IPPORT_RESERVED / 2);
 280         m_freem(m);
 281         if (error) {
 282                 printf("bind failed\n");
 283                 goto out;
 284         }
 285
 286         /*
 287          * Setup socket address for the server.
 288          */
 289         nam = m_get(M_WAIT, MT_SONAME);
 290         if (nam == NULL) {
 291                 error = ENOBUFS;
 292                 goto out;
 293         }
 294         sin = mtod(nam, struct sockaddr_in *);
 295         bcopy((caddr_t)sa, (caddr_t)sin, (nam->m_len = sa->sin_len));
 296
 297         /*
 298          * Prepend RPC message header.
 299          */
 300         m = *data;
 301         *data = NULL;
 302 #if     DIAGNOSTIC
 303         if ((m->m_flags & M_PKTHDR) == 0)
 304                 panic("krpc_call: send data w/o pkthdr");
 305         if (m->m_pkthdr.len < m->m_len)
 306                 panic("krpc_call: pkthdr.len not set");
 307 #endif
 308         mhead = m_prepend(m, sizeof(*call), M_WAIT);
 309         if (mhead == NULL) {
 310                 error = ENOBUFS;
 311                 goto out;
 312         }
 313         mhead->m_pkthdr.len += sizeof(*call);
 314         mhead->m_pkthdr.rcvif = NULL;
 315
 316         /*
 317          * Fill in the RPC header
 318          */
 319         call = mtod(mhead, struct rpc_call *);
 320         bzero((caddr_t)call, sizeof(*call));
 321         xid++;
 322         call->rp_xid = htonl(xid);
 323         /* call->rp_direction = 0; */
 324         call->rp_rpcvers = htonl(2);
 325         call->rp_prog = htonl(prog);
 326         call->rp_vers = htonl(vers);
 327         call->rp_proc = htonl(func);
 328         /* call->rp_auth = 0; */
 329         /* call->rp_verf = 0; */
 330
 331         /*
 332          * Send it, repeatedly, until a reply is received,
 333          * but delay each re-send by an increasing amount.
 334          * If the delay hits the maximum, start complaining.
 335          */
 336         timo = 0;
 337         for (;;) {
 338                 /* Send RPC request (or re-send). */
 339                 m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
 340                 if (m == NULL) {
 341                         error = ENOBUFS;
 342                         goto out;
 343                 }
 344                 error = sosend(so, mtod(nam, struct sockaddr *), NULL, m, NULL, 0);
 345                 if (error) {
 346                         printf("krpc_call: sosend: %d\n", error);
 347                         goto out;
 348                 }
 349                 m = NULL;
 350
 351                 /* Determine new timeout. */
 352                 if (timo < MAX_RESEND_DELAY)
 353                         timo++;
 354                 else
 355                         printf("RPC timeout for server " IP_FORMAT "\n",
 356                                 IP_LIST(&(sin->sin_addr.s_addr)));
 357
 358                 /*
 359                  * Wait for up to timo seconds for a reply.
 360                  * The socket receive timeout was set to 1 second.
 361                  */
 362                 secs = timo;
 363                 while (secs > 0) {
 364                         if ((from_p) && (*from_p)){
 365                                 FREE(*from_p, M_SONAME);
 366                                 *from_p = NULL;
 367                         }
 368
 369                         if (m) {
 370                                 m_freem(m);
 371                                 m = NULL;
 372                         }
 373                         auio.uio_resid = len = 1<<16;
 374                         rcvflg = 0;
 375
 376                         error = soreceive(so, (struct sockaddr **) from_p, &auio, &m, NULL, &rcvflg);
 377
 378                         if (error == EWOULDBLOCK) {
 379                                 secs--;
 380                                 continue;
 381                         }
 382                         if (error)
 383                                 goto out;
 384                         len -= auio.uio_resid;
 385
 386                         /* Does the reply contain at least a header? */
 387                         if (len < MIN_REPLY_HDR)
 388                                 continue;
 389                         if (m->m_len < MIN_REPLY_HDR)
 390                                 continue;
 391                         reply = mtod(m, struct rpc_reply *);
 392
 393                         /* Is it the right reply? */
 394                         if (reply->rp_direction != htonl(RPC_REPLY))
 395                                 continue;
 396
 397                         if (reply->rp_xid != htonl(xid))
 398                                 continue;
 399
 400                         /* Was RPC accepted? (authorization OK) */
 401                         if (reply->rp_astatus != 0) {
 402                                 error = ntohl(reply->rp_u.rpu_errno);
 403                                 printf("rpc denied, error=%d\n", error);
 404                                 continue;
 405                         }
 406
 407                         /* Did the call succeed? */
 408                         if ((error = ntohl(reply->rp_u.rpu_ok.rp_rstatus)) != 0) {
 409                                 printf("rpc status=%d\n", error);
 410                                 continue;
 411                         }
 412
 413                         goto gotreply;  /* break two levels */
 414
 415                 } /* while secs */
 416         } /* forever send/receive */
 417
 418         error = ETIMEDOUT;
 419         goto out;
 420
 421  gotreply:
 422
 423         /*
 424          * Pull as much as we can into first mbuf, to make
 425          * result buffer contiguous.  Note that if the entire
 426          * result won't fit into one mbuf, you're out of luck.
 427          * XXX - Should not rely on making the entire reply
 428          * contiguous (fix callers instead). -gwr
 429          */
 430 #if     DIAGNOSTIC
 431         if ((m->m_flags & M_PKTHDR) == 0)
 432                 panic("krpc_call: received pkt w/o header?");
 433 #endif
 434         len = m->m_pkthdr.len;
 435         if (m->m_len < len) {
 436                 m = m_pullup(m, len);
 437                 if (m == NULL) {
 438                         error = ENOBUFS;
 439                         goto out;
 440                 }
 441                 reply = mtod(m, struct rpc_reply *);
 442         }
 443
 444         /*
 445          * Strip RPC header
 446          */
 447         len = sizeof(*reply);
 448         if (reply->rp_u.rpu_ok.rp_auth.rp_atype != 0) {
 449                 len += ntohl(reply->rp_u.rpu_ok.rp_auth.rp_alen);
 450                 len = (len + 3) & ~3; /* XXX? */
 451         }
 452         m_adj(m, len);
 453
 454         /* result */
 455         *data = m;
 456  out:
 457         if (nam) m_freem(nam);
 458         if (mhead) m_freem(mhead);
 459         soclose(so);
 460         return error;
 461 }