Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/nfs/krpc_subr.c
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1 /* $OpenBSD: krpc_subr.c,v 1.37 2022/06/06 14:45:41 claudio Exp $ */ 2 /* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Gordon Ross, Adam Glass 6 * Copyright (c) 1992 Regents of the University of California. 7 * All rights reserved. 8 * 9 * This software was developed by the Computer Systems Engineering group 10 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 11 * contributed to Berkeley. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Lawrence Berkeley Laboratory and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * partially based on: 42 * libnetboot/rpc.c 43 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL) 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/conf.h> 49 #include <sys/ioctl.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/mbuf.h> 53 #include <sys/reboot.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 57 #include <netinet/in.h> 58 59 #include <nfs/rpcv2.h> 60 #include <nfs/krpc.h> 61 #include <nfs/xdr_subs.h> 62 #include <crypto/idgen.h> 63 64 /* 65 * Kernel support for Sun RPC 66 * 67 * Used currently for bootstrapping in nfs diskless configurations. 68 */ 69 70 /* 71 * Generic RPC headers 72 */ 73 74 struct auth_info { 75 u_int32_t authtype; /* auth type */ 76 u_int32_t authlen; /* auth length */ 77 }; 78 79 struct auth_unix { 80 int32_t ua_time; 81 int32_t ua_hostname; /* null */ 82 int32_t ua_uid; 83 int32_t ua_gid; 84 int32_t ua_gidlist; /* null */ 85 }; 86 87 struct rpc_call { 88 u_int32_t rp_xid; /* request transaction id */ 89 int32_t rp_direction; /* call direction (0) */ 90 u_int32_t rp_rpcvers; /* rpc version (2) */ 91 u_int32_t rp_prog; /* program */ 92 u_int32_t rp_vers; /* version */ 93 u_int32_t rp_proc; /* procedure */ 94 struct auth_info rpc_auth; 95 struct auth_unix rpc_unix; 96 struct auth_info rpc_verf; 97 }; 98 99 struct rpc_reply { 100 u_int32_t rp_xid; /* request transaction id */ 101 int32_t rp_direction; /* call direction (1) */ 102 int32_t rp_astatus; /* accept status (0: accepted) */ 103 union { 104 u_int32_t rpu_errno; 105 struct { 106 struct auth_info rok_auth; 107 u_int32_t rok_status; 108 } rpu_rok; 109 } rp_u; 110 }; 111 #define rp_errno rp_u.rpu_errno 112 #define rp_auth rp_u.rpu_rok.rok_auth 113 #define rp_status rp_u.rpu_rok.rok_status 114 115 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 116 117 u_int32_t krpc_get_xid(void); 118 119 /* 120 * Return an unpredictable XID. 121 */ 122 u_int32_t 123 krpc_get_xid(void) 124 { 125 static struct idgen32_ctx krpc_xid_ctx; 126 static int called = 0; 127 128 if (!called) { 129 called = 1; 130 idgen32_init(&krpc_xid_ctx); 131 } 132 return idgen32(&krpc_xid_ctx); 133 } 134 135 /* 136 * What is the longest we will wait before re-sending a request? 137 * Note this is also the frequency of "RPC timeout" messages. 138 * The re-send loop count sup linearly to this maximum, so the 139 * first complaint will happen after (1+2+3+4+5)=15 seconds. 140 */ 141 #define MAX_RESEND_DELAY 5 /* seconds */ 142 143 /* 144 * Call portmap to lookup a port number for a particular rpc program 145 * Returns non-zero error on failure. 146 */ 147 int 148 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp) 149 { 150 struct sdata { 151 u_int32_t prog; /* call program */ 152 u_int32_t vers; /* call version */ 153 u_int32_t proto; /* call protocol */ 154 u_int32_t port; /* call port (unused) */ 155 } *sdata; 156 struct rdata { 157 u_int16_t pad; 158 u_int16_t port; 159 } *rdata; 160 struct mbuf *m; 161 int error; 162 163 /* The portmapper port is fixed. */ 164 if (prog == PMAPPROG) { 165 *portp = htons(PMAPPORT); 166 return 0; 167 } 168 169 m = m_get(M_WAIT, MT_DATA); 170 sdata = mtod(m, struct sdata *); 171 m->m_len = sizeof(*sdata); 172 173 /* Do the RPC to get it. */ 174 sdata->prog = txdr_unsigned(prog); 175 sdata->vers = txdr_unsigned(vers); 176 sdata->proto = txdr_unsigned(IPPROTO_UDP); 177 sdata->port = 0; 178 179 sin->sin_port = htons(PMAPPORT); 180 error = krpc_call(sin, PMAPPROG, PMAPVERS, 181 PMAPPROC_GETPORT, &m, NULL, -1); 182 if (error) 183 return error; 184 185 if (m->m_len < sizeof(*rdata)) { 186 m = m_pullup(m, sizeof(*rdata)); 187 if (m == NULL) 188 return ENOBUFS; 189 } 190 rdata = mtod(m, struct rdata *); 191 *portp = rdata->port; 192 193 m_freem(m); 194 return 0; 195 } 196 197 /* 198 * Do a remote procedure call (RPC) and wait for its reply. 199 * If from_p is non-null, then we are doing broadcast, and 200 * the address from whence the response came is saved there. 201 * data: input/output 202 * from_p: output 203 */ 204 int 205 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func, 206 struct mbuf **data, struct mbuf **from_p, int retries) 207 { 208 struct socket *so; 209 struct sockaddr_in *sin; 210 struct mbuf *m, *nam, *mhead, *from, *mopt; 211 struct rpc_call *call; 212 struct rpc_reply *reply; 213 struct uio auio; 214 int error, rcvflg, timo, secs, len, authlen; 215 static u_int32_t xid = 0; 216 char addr[INET_ADDRSTRLEN]; 217 int *ip; 218 struct timeval tv; 219 220 /* 221 * Validate address family. 222 * Sorry, this is INET specific... 223 */ 224 if (sa->sin_family != AF_INET) 225 return (EAFNOSUPPORT); 226 227 /* Free at end if not null. */ 228 nam = mhead = NULL; 229 from = NULL; 230 231 /* 232 * Create socket and set its receive timeout. 233 */ 234 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 235 goto out; 236 237 m = m_get(M_WAIT, MT_SOOPTS); 238 tv.tv_sec = 1; 239 tv.tv_usec = 0; 240 memcpy(mtod(m, struct timeval *), &tv, sizeof tv); 241 m->m_len = sizeof(tv); 242 solock(so); 243 error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m); 244 sounlock(so); 245 m_freem(m); 246 if (error) 247 goto out; 248 249 /* 250 * Enable broadcast if necessary. 251 */ 252 if (from_p) { 253 int32_t *on; 254 m = m_get(M_WAIT, MT_SOOPTS); 255 on = mtod(m, int32_t *); 256 m->m_len = sizeof(*on); 257 *on = 1; 258 solock(so); 259 error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m); 260 sounlock(so); 261 m_freem(m); 262 if (error) 263 goto out; 264 } 265 266 /* 267 * Bind the local endpoint to a reserved port, 268 * because some NFS servers refuse requests from 269 * non-reserved (non-privileged) ports. 270 */ 271 MGET(mopt, M_WAIT, MT_SOOPTS); 272 mopt->m_len = sizeof(int); 273 ip = mtod(mopt, int *); 274 *ip = IP_PORTRANGE_LOW; 275 solock(so); 276 error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt); 277 sounlock(so); 278 m_freem(mopt); 279 if (error) 280 goto out; 281 282 MGET(m, M_WAIT, MT_SONAME); 283 sin = mtod(m, struct sockaddr_in *); 284 memset(sin, 0, sizeof(*sin)); 285 sin->sin_len = m->m_len = sizeof(struct sockaddr_in); 286 sin->sin_family = AF_INET; 287 sin->sin_addr.s_addr = INADDR_ANY; 288 sin->sin_port = htons(0); 289 solock(so); 290 error = sobind(so, m, &proc0); 291 sounlock(so); 292 m_freem(m); 293 if (error) { 294 printf("bind failed\n"); 295 goto out; 296 } 297 298 MGET(mopt, M_WAIT, MT_SOOPTS); 299 mopt->m_len = sizeof(int); 300 ip = mtod(mopt, int *); 301 *ip = IP_PORTRANGE_DEFAULT; 302 solock(so); 303 error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt); 304 sounlock(so); 305 m_freem(mopt); 306 if (error) 307 goto out; 308 309 /* 310 * Setup socket address for the server. 311 */ 312 nam = m_get(M_WAIT, MT_SONAME); 313 sin = mtod(nam, struct sockaddr_in *); 314 bcopy(sa, sin, (nam->m_len = sa->sin_len)); 315 316 /* 317 * Prepend RPC message header. 318 */ 319 mhead = m_gethdr(M_WAIT, MT_DATA); 320 mhead->m_next = *data; 321 call = mtod(mhead, struct rpc_call *); 322 mhead->m_len = sizeof(*call); 323 memset(call, 0, sizeof(*call)); 324 /* rpc_call part */ 325 xid = krpc_get_xid(); 326 call->rp_xid = txdr_unsigned(xid); 327 /* call->rp_direction = 0; */ 328 call->rp_rpcvers = txdr_unsigned(2); 329 call->rp_prog = txdr_unsigned(prog); 330 call->rp_vers = txdr_unsigned(vers); 331 call->rp_proc = txdr_unsigned(func); 332 /* rpc_auth part (auth_unix as root) */ 333 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 334 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 335 /* rpc_verf part (auth_null) */ 336 call->rpc_verf.authtype = 0; 337 call->rpc_verf.authlen = 0; 338 339 /* 340 * Setup packet header 341 */ 342 m_calchdrlen(mhead); 343 mhead->m_pkthdr.ph_ifidx = 0; 344 345 /* 346 * Send it, repeatedly, until a reply is received, 347 * but delay each re-send by an increasing amount. 348 * If the delay hits the maximum, start complaining. 349 */ 350 for (timo = 0; retries; retries--) { 351 /* Send RPC request (or re-send). */ 352 m = m_copym(mhead, 0, M_COPYALL, M_WAIT); 353 if (m == NULL) { 354 error = ENOBUFS; 355 goto out; 356 } 357 error = sosend(so, nam, NULL, m, NULL, 0); 358 if (error) { 359 printf("krpc_call: sosend: %d\n", error); 360 goto out; 361 } 362 m = NULL; 363 364 /* Determine new timeout. */ 365 if (timo < MAX_RESEND_DELAY) 366 timo++; 367 else 368 printf("RPC timeout for server %s (0x%x) prog %u\n", 369 inet_ntop(AF_INET, &sin->sin_addr, 370 addr, sizeof(addr)), 371 ntohl(sin->sin_addr.s_addr), prog); 372 373 /* 374 * Wait for up to timo seconds for a reply. 375 * The socket receive timeout was set to 1 second. 376 */ 377 secs = timo; 378 while (secs > 0) { 379 m_freem(from); 380 from = NULL; 381 382 m_freem(m); 383 m = NULL; 384 385 auio.uio_resid = len = 1<<16; 386 auio.uio_procp = NULL; 387 rcvflg = 0; 388 error = soreceive(so, &from, &auio, &m, NULL, &rcvflg, 389 0); 390 if (error == EWOULDBLOCK) { 391 secs--; 392 continue; 393 } 394 if (error) 395 goto out; 396 len -= auio.uio_resid; 397 398 /* Does the reply contain at least a header? */ 399 if (len < MIN_REPLY_HDR) 400 continue; 401 if (m->m_len < MIN_REPLY_HDR) 402 continue; 403 reply = mtod(m, struct rpc_reply *); 404 405 /* Is it the right reply? */ 406 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 407 continue; 408 409 if (reply->rp_xid != txdr_unsigned(xid)) 410 continue; 411 412 /* Was RPC accepted? (authorization OK) */ 413 if (reply->rp_astatus != 0) { 414 error = fxdr_unsigned(u_int32_t, reply->rp_errno); 415 printf("rpc denied, error=%d\n", error); 416 continue; 417 } 418 419 /* Did the call succeed? */ 420 if (reply->rp_status != 0) { 421 error = fxdr_unsigned(u_int32_t, reply->rp_status); 422 printf("rpc denied, status=%d\n", error); 423 continue; 424 } 425 426 goto gotreply; /* break two levels */ 427 428 } /* while secs */ 429 } /* forever send/receive */ 430 431 error = ETIMEDOUT; 432 goto out; 433 434 gotreply: 435 436 /* 437 * Get RPC reply header into first mbuf, 438 * get its length, then strip it off. 439 */ 440 len = sizeof(*reply); 441 KASSERT(m->m_flags & M_PKTHDR); 442 if (m->m_pkthdr.len < len) { 443 error = EBADRPC; 444 goto out; 445 } 446 if (m->m_len < len) { 447 m = m_pullup(m, len); 448 if (m == NULL) { 449 error = ENOBUFS; 450 goto out; 451 } 452 } 453 reply = mtod(m, struct rpc_reply *); 454 if (reply->rp_auth.authtype != 0) { 455 authlen = fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 456 if (authlen < 0 || authlen > RPCAUTH_MAXSIZ) { 457 error = EBADRPC; 458 goto out; 459 } 460 len += (authlen + 3) & ~3; /* XXX? */ 461 } 462 if (len < 0 || m->m_pkthdr.len < len) { 463 error = EBADRPC; 464 goto out; 465 } 466 m_adj(m, len); 467 468 /* result */ 469 *data = m; 470 if (from_p && error == 0) { 471 *from_p = from; 472 from = NULL; 473 } 474 475 out: 476 m_freem(nam); 477 m_freem(mhead); 478 m_freem(from); 479 soclose(so, 0); 480 return error; 481 } 482 483 /* 484 * eXternal Data Representation routines. 485 * (but with non-standard args...) 486 */ 487 488 /* 489 * String representation for RPC. 490 */ 491 struct xdr_string { 492 u_int32_t len; /* length without null or padding */ 493 char data[4]; /* data (longer, of course) */ 494 /* data is padded to a long-word boundary */ 495 }; 496 497 struct mbuf * 498 xdr_string_encode(char *str, int len) 499 { 500 struct mbuf *m; 501 struct xdr_string *xs; 502 int dlen; /* padded string length */ 503 int mlen; /* message length */ 504 505 dlen = (len + 3) & ~3; 506 mlen = dlen + 4; 507 508 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 509 return (NULL); 510 511 m = m_get(M_WAIT, MT_DATA); 512 if (mlen > MLEN) { 513 MCLGET(m, M_WAIT); 514 if ((m->m_flags & M_EXT) == 0) { 515 (void) m_free(m); /* There can be only one. */ 516 return (NULL); 517 } 518 } 519 xs = mtod(m, struct xdr_string *); 520 m->m_len = mlen; 521 xs->len = txdr_unsigned(len); 522 bcopy(str, xs->data, len); 523 return (m); 524 } 525 526 struct mbuf * 527 xdr_string_decode(struct mbuf *m, char *str, int *len_p) 528 { 529 struct xdr_string *xs; 530 int mlen; /* message length */ 531 int slen; /* string length */ 532 533 mlen = sizeof(u_int32_t); 534 KASSERT(m->m_flags & M_PKTHDR); 535 if (m->m_pkthdr.len < mlen) { 536 m_freem(m); 537 return (NULL); 538 } 539 if (m->m_len < mlen) { 540 m = m_pullup(m, mlen); 541 if (m == NULL) 542 return (NULL); 543 } 544 xs = mtod(m, struct xdr_string *); 545 slen = fxdr_unsigned(u_int32_t, xs->len); 546 if (slen < 0 || slen > INT_MAX - 3 - mlen) { 547 m_freem(m); 548 return (NULL); 549 } 550 mlen += (slen + 3) & ~3; 551 552 if (slen > *len_p) 553 slen = *len_p; 554 if (m->m_pkthdr.len < mlen) { 555 m_freem(m); 556 return (NULL); 557 } 558 m_copydata(m, 4, slen, str); 559 m_adj(m, mlen); 560 561 str[slen] = '\0'; 562 *len_p = slen; 563 564 return (m); 565 } 566 567 568 /* 569 * Inet address in RPC messages 570 * (Note, really four ints, NOT chars. Blech.) 571 */ 572 struct xdr_inaddr { 573 u_int32_t atype; 574 u_int32_t addr[4]; 575 }; 576 577 struct mbuf * 578 xdr_inaddr_encode(struct in_addr *ia) 579 { 580 struct mbuf *m; 581 struct xdr_inaddr *xi; 582 u_int8_t *cp; 583 u_int32_t *ip; 584 585 m = m_get(M_WAIT, MT_DATA); 586 xi = mtod(m, struct xdr_inaddr *); 587 m->m_len = sizeof(*xi); 588 xi->atype = txdr_unsigned(1); 589 ip = xi->addr; 590 cp = (u_int8_t *)&ia->s_addr; 591 *ip++ = txdr_unsigned(*cp++); 592 *ip++ = txdr_unsigned(*cp++); 593 *ip++ = txdr_unsigned(*cp++); 594 *ip++ = txdr_unsigned(*cp++); 595 596 return (m); 597 } 598 599 struct mbuf * 600 xdr_inaddr_decode(struct mbuf *m, struct in_addr *ia) 601 { 602 struct xdr_inaddr *xi; 603 u_int8_t *cp; 604 u_int32_t *ip; 605 606 if (m->m_len < sizeof(*xi)) { 607 m = m_pullup(m, sizeof(*xi)); 608 if (m == NULL) 609 return (NULL); 610 } 611 xi = mtod(m, struct xdr_inaddr *); 612 if (xi->atype != txdr_unsigned(1)) { 613 ia->s_addr = INADDR_ANY; 614 goto out; 615 } 616 ip = xi->addr; 617 cp = (u_int8_t *)&ia->s_addr; 618 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 619 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 620 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 621 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 622 623 out: 624 m_adj(m, sizeof(*xi)); 625 return (m); 626 }
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