krpc_subr.c revision 1.33
1 /* $NetBSD: krpc_subr.c,v 1.33 2008/04/24 11:38:39 ad 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 1.33 2008/04/24 11:38:39 ad 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, l) 135 struct sockaddr_in *sin; /* server address */ 136 u_int prog, vers, proto; /* host order */ 137 u_int16_t *portp; /* network order */ 138 struct lwp *l; 139 { 140 struct sdata { 141 u_int32_t prog; /* call program */ 142 u_int32_t vers; /* call version */ 143 u_int32_t proto; /* call protocol */ 144 u_int32_t port; /* call port (unused) */ 145 } *sdata; 146 struct rdata { 147 u_int16_t pad; 148 u_int16_t port; 149 } *rdata; 150 struct mbuf *m; 151 int error; 152 153 /* The portmapper port is fixed. */ 154 if (prog == PMAPPROG) { 155 *portp = htons(PMAPPORT); 156 return 0; 157 } 158 159 m = m_get(M_WAIT, MT_DATA); 160 sdata = mtod(m, struct sdata *); 161 m->m_len = sizeof(*sdata); 162 163 /* Do the RPC to get it. */ 164 sdata->prog = txdr_unsigned(prog); 165 sdata->vers = txdr_unsigned(vers); 166 sdata->proto = txdr_unsigned(proto); 167 sdata->port = 0; 168 169 sin->sin_port = htons(PMAPPORT); 170 error = krpc_call(sin, PMAPPROG, PMAPVERS, 171 PMAPPROC_GETPORT, &m, NULL, l); 172 if (error) 173 return error; 174 175 if (m->m_len < sizeof(*rdata)) { 176 m = m_pullup(m, sizeof(*rdata)); 177 if (m == NULL) 178 return ENOBUFS; 179 } 180 rdata = mtod(m, struct rdata *); 181 *portp = rdata->port; 182 183 m_freem(m); 184 return 0; 185 } 186 187 static int krpccheck(m, context) 188 struct mbuf *m; 189 void *context; 190 { 191 struct rpc_reply *reply; 192 193 /* Does the reply contain at least a header? */ 194 if (m->m_pkthdr.len < MIN_REPLY_HDR) 195 return(-1); 196 if (m->m_len < sizeof(struct rpc_reply)) { 197 m = m_pullup(m, sizeof(struct rpc_reply)); 198 if (m == NULL) 199 return(-1); 200 } 201 reply = mtod(m, struct rpc_reply *); 202 203 /* Is it the right reply? */ 204 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 205 return(-1); 206 207 if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) 208 return(-1); 209 210 return(0); 211 } 212 213 /* 214 * Do a remote procedure call (RPC) and wait for its reply. 215 * If from_p is non-null, then we are doing broadcast, and 216 * the address from whence the response came is saved there. 217 */ 218 int 219 krpc_call(sa, prog, vers, func, data, from_p, l) 220 struct sockaddr_in *sa; 221 u_int prog, vers, func; 222 struct mbuf **data; /* input/output */ 223 struct mbuf **from_p; /* output */ 224 struct lwp *l; 225 { 226 struct socket *so; 227 struct sockaddr_in *sin; 228 struct mbuf *m, *nam, *mhead, *from; 229 struct rpc_call *call; 230 struct rpc_reply *reply; 231 int error, len; 232 static u_int32_t xid = ~0xFF; 233 u_int16_t tport; 234 235 /* 236 * Validate address family. 237 * Sorry, this is INET specific... 238 */ 239 if (sa->sin_family != AF_INET) 240 return (EAFNOSUPPORT); 241 242 /* Free at end if not null. */ 243 nam = mhead = NULL; 244 from = NULL; 245 246 /* 247 * Create socket and set its receive timeout. 248 */ 249 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL))) 250 goto out; 251 252 if ((error = nfs_boot_setrecvtimo(so))) 253 goto out; 254 255 /* 256 * Enable broadcast if necessary. 257 */ 258 if (from_p) { 259 if ((error = nfs_boot_enbroadcast(so))) 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 tport = IPPORT_RESERVED; 269 do { 270 tport--; 271 error = nfs_boot_sobind_ipport(so, tport, l); 272 } while (error == EADDRINUSE && 273 tport > IPPORT_RESERVED / 2); 274 if (error) { 275 printf("bind failed\n"); 276 goto out; 277 } 278 279 /* 280 * Setup socket address for the server. 281 */ 282 nam = m_get(M_WAIT, MT_SONAME); 283 sin = mtod(nam, struct sockaddr_in *); 284 memcpy((void *)sin, (void *)sa, 285 (nam->m_len = sa->sin_len)); 286 287 /* 288 * Prepend RPC message header. 289 */ 290 mhead = m_gethdr(M_WAIT, MT_DATA); 291 mhead->m_next = *data; 292 call = mtod(mhead, struct rpc_call *); 293 mhead->m_len = sizeof(*call); 294 memset((void *)call, 0, sizeof(*call)); 295 /* rpc_call part */ 296 xid++; 297 call->rp_xid = txdr_unsigned(xid); 298 /* call->rp_direction = 0; */ 299 call->rp_rpcvers = txdr_unsigned(2); 300 call->rp_prog = txdr_unsigned(prog); 301 call->rp_vers = txdr_unsigned(vers); 302 call->rp_proc = txdr_unsigned(func); 303 /* rpc_auth part (auth_unix as root) */ 304 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 305 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 306 /* rpc_verf part (auth_null) */ 307 call->rpc_verf.authtype = 0; 308 call->rpc_verf.authlen = 0; 309 310 /* 311 * Setup packet header 312 */ 313 len = 0; 314 m = mhead; 315 while (m) { 316 len += m->m_len; 317 m = m->m_next; 318 } 319 mhead->m_pkthdr.len = len; 320 mhead->m_pkthdr.rcvif = NULL; 321 322 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, 323 &xid, l); 324 if (error) 325 goto out; 326 327 /* m_pullup() was done in krpccheck() */ 328 reply = mtod(m, struct rpc_reply *); 329 330 /* Was RPC accepted? (authorization OK) */ 331 if (reply->rp_astatus != 0) { 332 /* Note: This is NOT an error code! */ 333 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 334 switch (error) { 335 case RPC_MISMATCH: 336 /* .re_status = RPC_VERSMISMATCH; */ 337 error = ERPCMISMATCH; 338 break; 339 case RPC_AUTHERR: 340 /* .re_status = RPC_AUTHERROR; */ 341 error = EAUTH; 342 break; 343 default: 344 /* unexpected */ 345 error = EBADRPC; 346 break; 347 } 348 goto out; 349 } 350 351 /* Did the call succeed? */ 352 if (reply->rp_status != 0) { 353 /* Note: This is NOT an error code! */ 354 error = fxdr_unsigned(u_int32_t, reply->rp_status); 355 switch (error) { 356 case RPC_PROGUNAVAIL: 357 error = EPROGUNAVAIL; 358 break; 359 case RPC_PROGMISMATCH: 360 error = EPROGMISMATCH; 361 break; 362 case RPC_PROCUNAVAIL: 363 error = EPROCUNAVAIL; 364 break; 365 case RPC_GARBAGE: 366 default: 367 error = EBADRPC; 368 } 369 goto out; 370 } 371 372 /* 373 * OK, we have received a good reply! 374 * Get its length, then strip it off. 375 */ 376 len = sizeof(*reply); 377 if (reply->rp_auth.authtype != 0) { 378 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 379 len = (len + 3) & ~3; /* XXX? */ 380 } 381 m_adj(m, len); 382 383 /* result */ 384 *data = m; 385 if (from_p && error == 0) { 386 *from_p = from; 387 from = NULL; 388 } 389 390 out: 391 if (nam) m_freem(nam); 392 if (mhead) m_freem(mhead); 393 if (from) m_freem(from); 394 soclose(so); 395 return error; 396 } 397 398 /* 399 * eXternal Data Representation routines. 400 * (but with non-standard args...) 401 */ 402 403 /* 404 * String representation for RPC. 405 */ 406 struct xdr_string { 407 u_int32_t len; /* length without null or padding */ 408 char data[4]; /* data (longer, of course) */ 409 /* data is padded to a long-word boundary */ 410 }; 411 412 struct mbuf * 413 xdr_string_encode(str, len) 414 char *str; 415 int len; 416 { 417 struct mbuf *m; 418 struct xdr_string *xs; 419 int dlen; /* padded string length */ 420 int mlen; /* message length */ 421 422 dlen = (len + 3) & ~3; 423 mlen = dlen + 4; 424 425 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 426 return (NULL); 427 428 m = m_get(M_WAIT, MT_DATA); 429 if (mlen > MLEN) { 430 m_clget(m, M_WAIT); 431 if ((m->m_flags & M_EXT) == 0) { 432 (void) m_free(m); /* There can be only one. */ 433 return (NULL); 434 } 435 } 436 xs = mtod(m, struct xdr_string *); 437 m->m_len = mlen; 438 xs->len = txdr_unsigned(len); 439 memcpy(xs->data, str, len); 440 return (m); 441 } 442 443 struct mbuf * 444 xdr_string_decode(m, str, len_p) 445 struct mbuf *m; 446 char *str; 447 int *len_p; /* bufsize - 1 */ 448 { 449 struct xdr_string *xs; 450 int mlen; /* message length */ 451 int slen; /* string length */ 452 453 if (m->m_len < 4) { 454 m = m_pullup(m, 4); 455 if (m == NULL) 456 return (NULL); 457 } 458 xs = mtod(m, struct xdr_string *); 459 slen = fxdr_unsigned(u_int32_t, xs->len); 460 mlen = 4 + ((slen + 3) & ~3); 461 462 if (slen > *len_p) 463 slen = *len_p; 464 m_copydata(m, 4, slen, str); 465 m_adj(m, mlen); 466 467 str[slen] = '\0'; 468 *len_p = slen; 469 470 return (m); 471 } 472 473 474 /* 475 * Inet address in RPC messages 476 * (Note, really four ints, NOT chars. Blech.) 477 */ 478 struct xdr_inaddr { 479 u_int32_t atype; 480 u_int32_t addr[4]; 481 }; 482 483 struct mbuf * 484 xdr_inaddr_encode(ia) 485 struct in_addr *ia; /* already in network order */ 486 { 487 struct mbuf *m; 488 struct xdr_inaddr *xi; 489 u_int8_t *cp; 490 u_int32_t *ip; 491 492 m = m_get(M_WAIT, MT_DATA); 493 xi = mtod(m, struct xdr_inaddr *); 494 m->m_len = sizeof(*xi); 495 xi->atype = txdr_unsigned(1); 496 ip = xi->addr; 497 cp = (u_int8_t *)&ia->s_addr; 498 *ip++ = txdr_unsigned(*cp++); 499 *ip++ = txdr_unsigned(*cp++); 500 *ip++ = txdr_unsigned(*cp++); 501 *ip++ = txdr_unsigned(*cp++); 502 503 return (m); 504 } 505 506 struct mbuf * 507 xdr_inaddr_decode(m, ia) 508 struct mbuf *m; 509 struct in_addr *ia; /* already in network order */ 510 { 511 struct xdr_inaddr *xi; 512 u_int8_t *cp; 513 u_int32_t *ip; 514 515 if (m->m_len < sizeof(*xi)) { 516 m = m_pullup(m, sizeof(*xi)); 517 if (m == NULL) 518 return (NULL); 519 } 520 xi = mtod(m, struct xdr_inaddr *); 521 if (xi->atype != txdr_unsigned(1)) { 522 ia->s_addr = INADDR_ANY; 523 goto out; 524 } 525 ip = xi->addr; 526 cp = (u_int8_t *)&ia->s_addr; 527 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 528 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 529 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 530 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 531 532 out: 533 m_adj(m, sizeof(*xi)); 534 return (m); 535 } 536
Indexes created Sun Sep 28 12:09:53 GMT 2025