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 /* $NetBSD: krpc_subr.c,v 1.27 2003/02/26 06:31:18 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon Ross, Adam Glass 5 * Copyright (c) 1992 Regents of the University of California. 6 * All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Lawrence Berkeley Laboratory and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * partially based on: 41 * libnetboot/rpc.c 42 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL) 43 */ 44 45 #include <sys/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: krpc_subr.c,v 1.27 2003/02/26 06:31:18 matt Exp $"); 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/ioctl.h> 51 #include <sys/proc.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/reboot.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 58 #include <netinet/in.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/krpc.h> 62 #include <nfs/xdr_subs.h> 63 #include <nfs/nfsproto.h> /* XXX NFSX_V3FHMAX for next */ 64 #include <nfs/nfs.h> 65 #include <nfs/nfsmount.h> 66 #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */ 67 68 /* 69 * Kernel support for Sun RPC 70 * 71 * Used currently for bootstrapping in nfs diskless configurations. 72 */ 73 74 /* 75 * Generic RPC headers 76 */ 77 78 struct auth_info { 79 u_int32_t authtype; /* auth type */ 80 u_int32_t authlen; /* auth length */ 81 }; 82 83 struct auth_unix { 84 int32_t ua_time; 85 int32_t ua_hostname; /* null */ 86 int32_t ua_uid; 87 int32_t ua_gid; 88 int32_t ua_gidlist; /* null */ 89 }; 90 91 struct rpc_call { 92 u_int32_t rp_xid; /* request transaction id */ 93 int32_t rp_direction; /* call direction (0) */ 94 u_int32_t rp_rpcvers; /* rpc version (2) */ 95 u_int32_t rp_prog; /* program */ 96 u_int32_t rp_vers; /* version */ 97 u_int32_t rp_proc; /* procedure */ 98 struct auth_info rpc_auth; 99 struct auth_unix rpc_unix; 100 struct auth_info rpc_verf; 101 }; 102 103 struct rpc_reply { 104 u_int32_t rp_xid; /* request transaction id */ 105 int32_t rp_direction; /* call direction (1) */ 106 int32_t rp_astatus; /* accept status (0: accepted) */ 107 union { 108 /* rejected */ 109 struct { 110 u_int32_t rej_stat; 111 u_int32_t rej_val1; 112 u_int32_t rej_val2; 113 } rpu_rej; 114 /* accepted */ 115 struct { 116 struct auth_info rok_auth; 117 u_int32_t rok_status; 118 } rpu_rok; 119 } rp_u; 120 }; 121 #define rp_rstat rp_u.rpu_rej.rej_stat 122 #define rp_auth rp_u.rpu_rok.rok_auth 123 #define rp_status rp_u.rpu_rok.rok_status 124 125 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 126 127 static int krpccheck __P((struct mbuf*, void*)); 128 129 /* 130 * Call portmap to lookup a port number for a particular rpc program 131 * Returns non-zero error on failure. 132 */ 133 int 134 krpc_portmap(sin, prog, vers, proto, portp) 135 struct sockaddr_in *sin; /* server address */ 136 u_int prog, vers, proto; /* host order */ 137 u_int16_t *portp; /* network order */ 138 { 139 struct sdata { 140 u_int32_t prog; /* call program */ 141 u_int32_t vers; /* call version */ 142 u_int32_t proto; /* call protocol */ 143 u_int32_t port; /* call port (unused) */ 144 } *sdata; 145 struct rdata { 146 u_int16_t pad; 147 u_int16_t port; 148 } *rdata; 149 struct mbuf *m; 150 int error; 151 152 /* The portmapper port is fixed. */ 153 if (prog == PMAPPROG) { 154 *portp = htons(PMAPPORT); 155 return 0; 156 } 157 158 m = m_get(M_WAIT, MT_DATA); 159 sdata = mtod(m, struct sdata *); 160 m->m_len = sizeof(*sdata); 161 162 /* Do the RPC to get it. */ 163 sdata->prog = txdr_unsigned(prog); 164 sdata->vers = txdr_unsigned(vers); 165 sdata->proto = txdr_unsigned(proto); 166 sdata->port = 0; 167 168 sin->sin_port = htons(PMAPPORT); 169 error = krpc_call(sin, PMAPPROG, PMAPVERS, 170 PMAPPROC_GETPORT, &m, NULL); 171 if (error) 172 return error; 173 174 if (m->m_len < sizeof(*rdata)) { 175 m = m_pullup(m, sizeof(*rdata)); 176 if (m == NULL) 177 return ENOBUFS; 178 } 179 rdata = mtod(m, struct rdata *); 180 *portp = rdata->port; 181 182 m_freem(m); 183 return 0; 184 } 185 186 static int krpccheck(m, context) 187 struct mbuf *m; 188 void *context; 189 { 190 struct rpc_reply *reply; 191 192 /* Does the reply contain at least a header? */ 193 if (m->m_pkthdr.len < MIN_REPLY_HDR) 194 return(-1); 195 if (m->m_len < sizeof(struct rpc_reply)) { 196 m = m_pullup(m, sizeof(struct rpc_reply)); 197 if (m == NULL) 198 return(-1); 199 } 200 reply = mtod(m, struct rpc_reply *); 201 202 /* Is it the right reply? */ 203 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 204 return(-1); 205 206 if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) 207 return(-1); 208 209 return(0); 210 } 211 212 /* 213 * Do a remote procedure call (RPC) and wait for its reply. 214 * If from_p is non-null, then we are doing broadcast, and 215 * the address from whence the response came is saved there. 216 */ 217 int 218 krpc_call(sa, prog, vers, func, data, from_p) 219 struct sockaddr_in *sa; 220 u_int prog, vers, func; 221 struct mbuf **data; /* input/output */ 222 struct mbuf **from_p; /* output */ 223 { 224 struct socket *so; 225 struct sockaddr_in *sin; 226 struct mbuf *m, *nam, *mhead, *from; 227 struct rpc_call *call; 228 struct rpc_reply *reply; 229 int error, len; 230 static u_int32_t xid = ~0xFF; 231 u_int16_t tport; 232 233 /* 234 * Validate address family. 235 * Sorry, this is INET specific... 236 */ 237 if (sa->sin_family != AF_INET) 238 return (EAFNOSUPPORT); 239 240 /* Free at end if not null. */ 241 nam = mhead = NULL; 242 from = NULL; 243 244 /* 245 * Create socket and set its receive timeout. 246 */ 247 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 248 goto out; 249 250 if ((error = nfs_boot_setrecvtimo(so))) 251 goto out; 252 253 /* 254 * Enable broadcast if necessary. 255 */ 256 if (from_p) { 257 if ((error = nfs_boot_enbroadcast(so))) 258 goto out; 259 } 260 261 /* 262 * Bind the local endpoint to a reserved port, 263 * because some NFS servers refuse requests from 264 * non-reserved (non-privileged) ports. 265 */ 266 tport = IPPORT_RESERVED; 267 do { 268 tport--; 269 error = nfs_boot_sobind_ipport(so, tport); 270 } while (error == EADDRINUSE && 271 tport > IPPORT_RESERVED / 2); 272 if (error) { 273 printf("bind failed\n"); 274 goto out; 275 } 276 277 /* 278 * Setup socket address for the server. 279 */ 280 nam = m_get(M_WAIT, MT_SONAME); 281 sin = mtod(nam, struct sockaddr_in *); 282 memcpy((caddr_t)sin, (caddr_t)sa, 283 (nam->m_len = sa->sin_len)); 284 285 /* 286 * Prepend RPC message header. 287 */ 288 mhead = m_gethdr(M_WAIT, MT_DATA); 289 mhead->m_next = *data; 290 call = mtod(mhead, struct rpc_call *); 291 mhead->m_len = sizeof(*call); 292 memset((caddr_t)call, 0, sizeof(*call)); 293 /* rpc_call part */ 294 xid++; 295 call->rp_xid = txdr_unsigned(xid); 296 /* call->rp_direction = 0; */ 297 call->rp_rpcvers = txdr_unsigned(2); 298 call->rp_prog = txdr_unsigned(prog); 299 call->rp_vers = txdr_unsigned(vers); 300 call->rp_proc = txdr_unsigned(func); 301 /* rpc_auth part (auth_unix as root) */ 302 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 303 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 304 /* rpc_verf part (auth_null) */ 305 call->rpc_verf.authtype = 0; 306 call->rpc_verf.authlen = 0; 307 308 /* 309 * Setup packet header 310 */ 311 len = 0; 312 m = mhead; 313 while (m) { 314 len += m->m_len; 315 m = m->m_next; 316 } 317 mhead->m_pkthdr.len = len; 318 mhead->m_pkthdr.rcvif = NULL; 319 320 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, &xid); 321 if (error) 322 goto out; 323 324 /* m_pullup() was done in krpccheck() */ 325 reply = mtod(m, struct rpc_reply *); 326 327 /* Was RPC accepted? (authorization OK) */ 328 if (reply->rp_astatus != 0) { 329 /* Note: This is NOT an error code! */ 330 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 331 switch (error) { 332 case RPC_MISMATCH: 333 /* .re_status = RPC_VERSMISMATCH; */ 334 error = ERPCMISMATCH; 335 break; 336 case RPC_AUTHERR: 337 /* .re_status = RPC_AUTHERROR; */ 338 error = EAUTH; 339 break; 340 default: 341 /* unexpected */ 342 error = EBADRPC; 343 break; 344 } 345 goto out; 346 } 347 348 /* Did the call succeed? */ 349 if (reply->rp_status != 0) { 350 /* Note: This is NOT an error code! */ 351 error = fxdr_unsigned(u_int32_t, reply->rp_status); 352 switch (error) { 353 case RPC_PROGUNAVAIL: 354 error = EPROGUNAVAIL; 355 break; 356 case RPC_PROGMISMATCH: 357 error = EPROGMISMATCH; 358 break; 359 case RPC_PROCUNAVAIL: 360 error = EPROCUNAVAIL; 361 break; 362 case RPC_GARBAGE: 363 default: 364 error = EBADRPC; 365 } 366 goto out; 367 } 368 369 /* 370 * OK, we have received a good reply! 371 * Get its length, then strip it off. 372 */ 373 len = sizeof(*reply); 374 if (reply->rp_auth.authtype != 0) { 375 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 376 len = (len + 3) & ~3; /* XXX? */ 377 } 378 m_adj(m, len); 379 380 /* result */ 381 *data = m; 382 if (from_p) { 383 *from_p = from; 384 from = NULL; 385 } 386 387 out: 388 if (nam) m_freem(nam); 389 if (mhead) m_freem(mhead); 390 if (from) m_freem(from); 391 soclose(so); 392 return error; 393 } 394 395 /* 396 * eXternal Data Representation routines. 397 * (but with non-standard args...) 398 */ 399 400 /* 401 * String representation for RPC. 402 */ 403 struct xdr_string { 404 u_int32_t len; /* length without null or padding */ 405 char data[4]; /* data (longer, of course) */ 406 /* data is padded to a long-word boundary */ 407 }; 408 409 struct mbuf * 410 xdr_string_encode(str, len) 411 char *str; 412 int len; 413 { 414 struct mbuf *m; 415 struct xdr_string *xs; 416 int dlen; /* padded string length */ 417 int mlen; /* message length */ 418 419 dlen = (len + 3) & ~3; 420 mlen = dlen + 4; 421 422 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 423 return (NULL); 424 425 m = m_get(M_WAIT, MT_DATA); 426 if (mlen > MLEN) { 427 m_clget(m, M_WAIT); 428 if ((m->m_flags & M_EXT) == 0) { 429 (void) m_free(m); /* There can be only one. */ 430 return (NULL); 431 } 432 } 433 xs = mtod(m, struct xdr_string *); 434 m->m_len = mlen; 435 xs->len = txdr_unsigned(len); 436 memcpy(xs->data, str, len); 437 return (m); 438 } 439 440 struct mbuf * 441 xdr_string_decode(m, str, len_p) 442 struct mbuf *m; 443 char *str; 444 int *len_p; /* bufsize - 1 */ 445 { 446 struct xdr_string *xs; 447 int mlen; /* message length */ 448 int slen; /* string length */ 449 450 if (m->m_len < 4) { 451 m = m_pullup(m, 4); 452 if (m == NULL) 453 return (NULL); 454 } 455 xs = mtod(m, struct xdr_string *); 456 slen = fxdr_unsigned(u_int32_t, xs->len); 457 mlen = 4 + ((slen + 3) & ~3); 458 459 if (slen > *len_p) 460 slen = *len_p; 461 m_copydata(m, 4, slen, str); 462 m_adj(m, mlen); 463 464 str[slen] = '\0'; 465 *len_p = slen; 466 467 return (m); 468 } 469 470 471 /* 472 * Inet address in RPC messages 473 * (Note, really four ints, NOT chars. Blech.) 474 */ 475 struct xdr_inaddr { 476 u_int32_t atype; 477 u_int32_t addr[4]; 478 }; 479 480 struct mbuf * 481 xdr_inaddr_encode(ia) 482 struct in_addr *ia; /* already in network order */ 483 { 484 struct mbuf *m; 485 struct xdr_inaddr *xi; 486 u_int8_t *cp; 487 u_int32_t *ip; 488 489 m = m_get(M_WAIT, MT_DATA); 490 xi = mtod(m, struct xdr_inaddr *); 491 m->m_len = sizeof(*xi); 492 xi->atype = txdr_unsigned(1); 493 ip = xi->addr; 494 cp = (u_int8_t *)&ia->s_addr; 495 *ip++ = txdr_unsigned(*cp++); 496 *ip++ = txdr_unsigned(*cp++); 497 *ip++ = txdr_unsigned(*cp++); 498 *ip++ = txdr_unsigned(*cp++); 499 500 return (m); 501 } 502 503 struct mbuf * 504 xdr_inaddr_decode(m, ia) 505 struct mbuf *m; 506 struct in_addr *ia; /* already in network order */ 507 { 508 struct xdr_inaddr *xi; 509 u_int8_t *cp; 510 u_int32_t *ip; 511 512 if (m->m_len < sizeof(*xi)) { 513 m = m_pullup(m, sizeof(*xi)); 514 if (m == NULL) 515 return (NULL); 516 } 517 xi = mtod(m, struct xdr_inaddr *); 518 if (xi->atype != txdr_unsigned(1)) { 519 ia->s_addr = INADDR_ANY; 520 goto out; 521 } 522 ip = xi->addr; 523 cp = (u_int8_t *)&ia->s_addr; 524 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 525 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 526 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 527 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 528 529 out: 530 m_adj(m, sizeof(*xi)); 531 return (m); 532 }
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