krpc_subr.c revision 1.36
1 /* $NetBSD: krpc_subr.c,v 1.36 2009/03/14 21:04:25 dsl 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 1.36 2009/03/14 21:04:25 dsl 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(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(struct sockaddr_in *sin, u_int prog, u_int vers, u_int proto, u_int16_t *portp, struct lwp *l) 135 /* sin: server address */ 136 /* prog, vers, proto: host order */ 137 /* 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, l); 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(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func, struct mbuf **data, struct mbuf **from_p, struct lwp *l) 219 /* data: input/output */ 220 /* from_p: output */ 221 { 222 struct socket *so; 223 struct sockaddr_in *sin; 224 struct mbuf *m, *nam, *mhead, *from; 225 struct rpc_call *call; 226 struct rpc_reply *reply; 227 int error, len; 228 static u_int32_t xid = ~0xFF; 229 u_int16_t tport; 230 231 /* 232 * Validate address family. 233 * Sorry, this is INET specific... 234 */ 235 if (sa->sin_family != AF_INET) 236 return (EAFNOSUPPORT); 237 238 /* Free at end if not null. */ 239 nam = mhead = NULL; 240 from = NULL; 241 242 /* 243 * Create socket and set its receive timeout. 244 */ 245 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL))) 246 goto out; 247 248 if ((error = nfs_boot_setrecvtimo(so))) 249 goto out; 250 251 /* 252 * Enable broadcast if necessary. 253 */ 254 if (from_p) { 255 if ((error = nfs_boot_enbroadcast(so))) 256 goto out; 257 } 258 259 /* 260 * Bind the local endpoint to a reserved port, 261 * because some NFS servers refuse requests from 262 * non-reserved (non-privileged) ports. 263 */ 264 tport = IPPORT_RESERVED; 265 do { 266 tport--; 267 error = nfs_boot_sobind_ipport(so, tport, l); 268 } while (error == EADDRINUSE && 269 tport > IPPORT_RESERVED / 2); 270 if (error) { 271 printf("bind failed\n"); 272 goto out; 273 } 274 275 /* 276 * Setup socket address for the server. 277 */ 278 nam = m_get(M_WAIT, MT_SONAME); 279 sin = mtod(nam, struct sockaddr_in *); 280 memcpy((void *)sin, (void *)sa, 281 (nam->m_len = sa->sin_len)); 282 283 /* 284 * Prepend RPC message header. 285 */ 286 mhead = m_gethdr(M_WAIT, MT_DATA); 287 mhead->m_next = *data; 288 call = mtod(mhead, struct rpc_call *); 289 mhead->m_len = sizeof(*call); 290 memset((void *)call, 0, sizeof(*call)); 291 /* rpc_call part */ 292 xid++; 293 call->rp_xid = txdr_unsigned(xid); 294 /* call->rp_direction = 0; */ 295 call->rp_rpcvers = txdr_unsigned(2); 296 call->rp_prog = txdr_unsigned(prog); 297 call->rp_vers = txdr_unsigned(vers); 298 call->rp_proc = txdr_unsigned(func); 299 /* rpc_auth part (auth_unix as root) */ 300 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 301 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 302 /* rpc_verf part (auth_null) */ 303 call->rpc_verf.authtype = 0; 304 call->rpc_verf.authlen = 0; 305 306 /* 307 * Setup packet header 308 */ 309 len = 0; 310 m = mhead; 311 while (m) { 312 len += m->m_len; 313 m = m->m_next; 314 } 315 mhead->m_pkthdr.len = len; 316 mhead->m_pkthdr.rcvif = NULL; 317 318 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, 319 &xid, l); 320 if (error) 321 goto out; 322 323 /* m_pullup() was done in krpccheck() */ 324 reply = mtod(m, struct rpc_reply *); 325 326 /* Was RPC accepted? (authorization OK) */ 327 if (reply->rp_astatus != 0) { 328 /* Note: This is NOT an error code! */ 329 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 330 switch (error) { 331 case RPC_MISMATCH: 332 /* .re_status = RPC_VERSMISMATCH; */ 333 error = ERPCMISMATCH; 334 break; 335 case RPC_AUTHERR: 336 /* .re_status = RPC_AUTHERROR; */ 337 error = EAUTH; 338 break; 339 default: 340 /* unexpected */ 341 error = EBADRPC; 342 break; 343 } 344 goto out; 345 } 346 347 /* Did the call succeed? */ 348 if (reply->rp_status != 0) { 349 /* Note: This is NOT an error code! */ 350 error = fxdr_unsigned(u_int32_t, reply->rp_status); 351 switch (error) { 352 case RPC_PROGUNAVAIL: 353 error = EPROGUNAVAIL; 354 break; 355 case RPC_PROGMISMATCH: 356 error = EPROGMISMATCH; 357 break; 358 case RPC_PROCUNAVAIL: 359 error = EPROCUNAVAIL; 360 break; 361 case RPC_GARBAGE: 362 default: 363 error = EBADRPC; 364 } 365 goto out; 366 } 367 368 /* 369 * OK, we have received a good reply! 370 * Get its length, then strip it off. 371 */ 372 len = sizeof(*reply); 373 if (reply->rp_auth.authtype != 0) { 374 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 375 len = (len + 3) & ~3; /* XXX? */ 376 } 377 m_adj(m, len); 378 379 /* result */ 380 *data = m; 381 if (from_p && error == 0) { 382 *from_p = from; 383 from = NULL; 384 } 385 386 out: 387 if (nam) m_freem(nam); 388 if (mhead) m_freem(mhead); 389 if (from) m_freem(from); 390 soclose(so); 391 return error; 392 } 393 394 /* 395 * eXternal Data Representation routines. 396 * (but with non-standard args...) 397 */ 398 399 /* 400 * String representation for RPC. 401 */ 402 struct xdr_string { 403 u_int32_t len; /* length without null or padding */ 404 char data[4]; /* data (longer, of course) */ 405 /* data is padded to a long-word boundary */ 406 }; 407 408 struct mbuf * 409 xdr_string_encode(char *str, int len) 410 { 411 struct mbuf *m; 412 struct xdr_string *xs; 413 int dlen; /* padded string length */ 414 int mlen; /* message length */ 415 416 dlen = (len + 3) & ~3; 417 mlen = dlen + 4; 418 419 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 420 return (NULL); 421 422 m = m_get(M_WAIT, MT_DATA); 423 if (mlen > MLEN) { 424 m_clget(m, M_WAIT); 425 if ((m->m_flags & M_EXT) == 0) { 426 (void) m_free(m); /* There can be only one. */ 427 return (NULL); 428 } 429 } 430 xs = mtod(m, struct xdr_string *); 431 m->m_len = mlen; 432 xs->len = txdr_unsigned(len); 433 memcpy(xs->data, str, len); 434 return (m); 435 } 436 437 struct mbuf * 438 xdr_string_decode(struct mbuf *m, char *str, int *len_p) 439 /* len_p: bufsize - 1 */ 440 { 441 struct xdr_string *xs; 442 int mlen; /* message length */ 443 int slen; /* string length */ 444 445 if (m->m_len < 4) { 446 m = m_pullup(m, 4); 447 if (m == NULL) 448 return (NULL); 449 } 450 xs = mtod(m, struct xdr_string *); 451 slen = fxdr_unsigned(u_int32_t, xs->len); 452 mlen = 4 + ((slen + 3) & ~3); 453 454 if (slen > *len_p) 455 slen = *len_p; 456 m_copydata(m, 4, slen, str); 457 m_adj(m, mlen); 458 459 str[slen] = '\0'; 460 *len_p = slen; 461 462 return (m); 463 } 464 465 466 /* 467 * Inet address in RPC messages 468 * (Note, really four ints, NOT chars. Blech.) 469 */ 470 struct xdr_inaddr { 471 u_int32_t atype; 472 u_int32_t addr[4]; 473 }; 474 475 struct mbuf * 476 xdr_inaddr_encode(struct in_addr *ia) 477 /* ia: already in network order */ 478 { 479 struct mbuf *m; 480 struct xdr_inaddr *xi; 481 u_int8_t *cp; 482 u_int32_t *ip; 483 484 m = m_get(M_WAIT, MT_DATA); 485 xi = mtod(m, struct xdr_inaddr *); 486 m->m_len = sizeof(*xi); 487 xi->atype = txdr_unsigned(1); 488 ip = xi->addr; 489 cp = (u_int8_t *)&ia->s_addr; 490 *ip++ = txdr_unsigned(*cp++); 491 *ip++ = txdr_unsigned(*cp++); 492 *ip++ = txdr_unsigned(*cp++); 493 *ip++ = txdr_unsigned(*cp++); 494 495 return (m); 496 } 497 498 struct mbuf * 499 xdr_inaddr_decode(struct mbuf *m, struct in_addr *ia) 500 /* ia: already in network order */ 501 { 502 struct xdr_inaddr *xi; 503 u_int8_t *cp; 504 u_int32_t *ip; 505 506 if (m->m_len < sizeof(*xi)) { 507 m = m_pullup(m, sizeof(*xi)); 508 if (m == NULL) 509 return (NULL); 510 } 511 xi = mtod(m, struct xdr_inaddr *); 512 if (xi->atype != txdr_unsigned(1)) { 513 ia->s_addr = INADDR_ANY; 514 goto out; 515 } 516 ip = xi->addr; 517 cp = (u_int8_t *)&ia->s_addr; 518 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 519 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 520 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 521 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 522 523 out: 524 m_adj(m, sizeof(*xi)); 525 return (m); 526 } 527
Indexes created Sun Sep 28 07:09:56 GMT 2025