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 1.42 2016/06/10 13:27:16 ozaki-r 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 1.42 2016/06/10 13:27:16 ozaki-r 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(struct mbuf **mp, void *context) 187 { 188 struct rpc_reply *reply; 189 struct mbuf *m = *mp; 190 191 /* Does the reply contain at least a header? */ 192 if (m->m_pkthdr.len < MIN_REPLY_HDR) 193 return(-1); 194 if (m->m_len < sizeof(struct rpc_reply)) { 195 m = *mp = m_pullup(m, sizeof(struct rpc_reply)); 196 if (m == NULL) 197 return(-1); 198 } 199 reply = mtod(m, struct rpc_reply *); 200 201 /* Is it the right reply? */ 202 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 203 return(-1); 204 205 if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) 206 return(-1); 207 208 return(0); 209 } 210 211 /* 212 * Do a remote procedure call (RPC) and wait for its reply. 213 * If from_p is non-null, then we are doing broadcast, and 214 * the address from whence the response came is saved there. 215 */ 216 int 217 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) 218 /* data: input/output */ 219 /* from_p: output */ 220 { 221 struct socket *so; 222 struct sockaddr_in sin; 223 struct mbuf *m, *mhead, *from; 224 struct rpc_call *call; 225 struct rpc_reply *reply; 226 int error, len; 227 static u_int32_t xid = ~0xFF; 228 u_int16_t tport; 229 230 /* 231 * Validate address family. 232 * Sorry, this is INET specific... 233 */ 234 if (sa->sin_family != AF_INET) 235 return (EAFNOSUPPORT); 236 237 /* Free at end if not null. */ 238 mhead = NULL; 239 from = NULL; 240 241 /* 242 * Create socket and set its receive timeout. 243 */ 244 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL))) 245 return error; 246 247 if ((error = nfs_boot_setrecvtimo(so))) 248 goto out; 249 250 /* 251 * Enable broadcast if necessary. 252 */ 253 if (from_p) { 254 if ((error = nfs_boot_enbroadcast(so))) 255 goto out; 256 } 257 258 /* 259 * Bind the local endpoint to a reserved port, 260 * because some NFS servers refuse requests from 261 * non-reserved (non-privileged) ports. 262 */ 263 tport = IPPORT_RESERVED; 264 do { 265 tport--; 266 error = nfs_boot_sobind_ipport(so, tport, l); 267 } while (error == EADDRINUSE && 268 tport > IPPORT_RESERVED / 2); 269 if (error) { 270 printf("bind failed\n"); 271 goto out; 272 } 273 274 /* 275 * Setup socket address for the server. 276 */ 277 sin = *sa; 278 279 /* 280 * Prepend RPC message header. 281 */ 282 mhead = m_gethdr(M_WAIT, MT_DATA); 283 mhead->m_next = *data; 284 call = mtod(mhead, struct rpc_call *); 285 mhead->m_len = sizeof(*call); 286 memset((void *)call, 0, sizeof(*call)); 287 /* rpc_call part */ 288 xid++; 289 call->rp_xid = txdr_unsigned(xid); 290 /* call->rp_direction = 0; */ 291 call->rp_rpcvers = txdr_unsigned(2); 292 call->rp_prog = txdr_unsigned(prog); 293 call->rp_vers = txdr_unsigned(vers); 294 call->rp_proc = txdr_unsigned(func); 295 /* rpc_auth part (auth_unix as root) */ 296 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 297 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 298 /* rpc_verf part (auth_null) */ 299 call->rpc_verf.authtype = 0; 300 call->rpc_verf.authlen = 0; 301 302 /* 303 * Setup packet header 304 */ 305 len = 0; 306 m = mhead; 307 while (m) { 308 len += m->m_len; 309 m = m->m_next; 310 } 311 mhead->m_pkthdr.len = len; 312 m_reset_rcvif(mhead); 313 314 error = nfs_boot_sendrecv(so, &sin, NULL, mhead, krpccheck, &m, &from, 315 &xid, l); 316 if (error) 317 goto out; 318 319 /* m_pullup() was done in krpccheck() */ 320 reply = mtod(m, struct rpc_reply *); 321 322 /* Was RPC accepted? (authorization OK) */ 323 if (reply->rp_astatus != 0) { 324 /* Note: This is NOT an error code! */ 325 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 326 switch (error) { 327 case RPC_MISMATCH: 328 /* .re_status = RPC_VERSMISMATCH; */ 329 error = ERPCMISMATCH; 330 break; 331 case RPC_AUTHERR: 332 /* .re_status = RPC_AUTHERROR; */ 333 error = EAUTH; 334 break; 335 default: 336 /* unexpected */ 337 error = EBADRPC; 338 break; 339 } 340 goto out; 341 } 342 343 /* Did the call succeed? */ 344 if (reply->rp_status != 0) { 345 /* Note: This is NOT an error code! */ 346 error = fxdr_unsigned(u_int32_t, reply->rp_status); 347 switch (error) { 348 case RPC_PROGUNAVAIL: 349 error = EPROGUNAVAIL; 350 break; 351 case RPC_PROGMISMATCH: 352 error = EPROGMISMATCH; 353 break; 354 case RPC_PROCUNAVAIL: 355 error = EPROCUNAVAIL; 356 break; 357 case RPC_GARBAGE: 358 default: 359 error = EBADRPC; 360 } 361 goto out; 362 } 363 364 /* 365 * OK, we have received a good reply! 366 * Get its length, then strip it off. 367 */ 368 len = sizeof(*reply); 369 if (reply->rp_auth.authtype != 0) { 370 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 371 len = (len + 3) & ~3; /* XXX? */ 372 } 373 m_adj(m, len); 374 375 /* result */ 376 *data = m; 377 if (from_p && error == 0) { 378 *from_p = from; 379 from = NULL; 380 } 381 382 out: 383 if (mhead) m_freem(mhead); 384 if (from) m_freem(from); 385 soclose(so); 386 return error; 387 } 388 389 /* 390 * eXternal Data Representation routines. 391 * (but with non-standard args...) 392 */ 393 394 /* 395 * String representation for RPC. 396 */ 397 struct xdr_string { 398 u_int32_t len; /* length without null or padding */ 399 char data[4]; /* data (longer, of course) */ 400 /* data is padded to a long-word boundary */ 401 }; 402 403 struct mbuf * 404 xdr_string_encode(char *str, int len) 405 { 406 struct mbuf *m; 407 struct xdr_string *xs; 408 int dlen; /* padded string length */ 409 int mlen; /* message length */ 410 411 dlen = (len + 3) & ~3; 412 mlen = dlen + 4; 413 414 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 415 return (NULL); 416 417 m = m_get(M_WAIT, MT_DATA); 418 if (mlen > MLEN) { 419 m_clget(m, M_WAIT); 420 if ((m->m_flags & M_EXT) == 0) { 421 (void) m_free(m); /* There can be only one. */ 422 return (NULL); 423 } 424 } 425 xs = mtod(m, struct xdr_string *); 426 m->m_len = mlen; 427 xs->len = txdr_unsigned(len); 428 memcpy(xs->data, str, len); 429 return (m); 430 } 431 432 struct mbuf * 433 xdr_string_decode(struct mbuf *m, char *str, int *len_p) 434 /* len_p: bufsize - 1 */ 435 { 436 struct xdr_string *xs; 437 int mlen; /* message length */ 438 int slen; /* string length */ 439 440 if (m->m_len < 4) { 441 m = m_pullup(m, 4); 442 if (m == NULL) 443 return (NULL); 444 } 445 xs = mtod(m, struct xdr_string *); 446 slen = fxdr_unsigned(u_int32_t, xs->len); 447 mlen = 4 + ((slen + 3) & ~3); 448 449 if (slen > *len_p) 450 slen = *len_p; 451 m_copydata(m, 4, slen, str); 452 m_adj(m, mlen); 453 454 str[slen] = '\0'; 455 *len_p = slen; 456 457 return (m); 458 } 459 460 461 /* 462 * Inet address in RPC messages 463 * (Note, really four ints, NOT chars. Blech.) 464 */ 465 struct xdr_inaddr { 466 u_int32_t atype; 467 u_int32_t addr[4]; 468 }; 469 470 struct mbuf * 471 xdr_inaddr_encode(struct in_addr *ia) 472 /* ia: already in network order */ 473 { 474 struct mbuf *m; 475 struct xdr_inaddr *xi; 476 u_int8_t *cp; 477 u_int32_t *ip; 478 479 m = m_get(M_WAIT, MT_DATA); 480 xi = mtod(m, struct xdr_inaddr *); 481 m->m_len = sizeof(*xi); 482 xi->atype = txdr_unsigned(1); 483 ip = xi->addr; 484 cp = (u_int8_t *)&ia->s_addr; 485 *ip++ = txdr_unsigned(*cp++); 486 *ip++ = txdr_unsigned(*cp++); 487 *ip++ = txdr_unsigned(*cp++); 488 *ip++ = txdr_unsigned(*cp++); 489 490 return (m); 491 } 492 493 struct mbuf * 494 xdr_inaddr_decode(struct mbuf *m, struct in_addr *ia) 495 /* ia: already in network order */ 496 { 497 struct xdr_inaddr *xi; 498 u_int8_t *cp; 499 u_int32_t *ip; 500 501 if (m->m_len < sizeof(*xi)) { 502 m = m_pullup(m, sizeof(*xi)); 503 if (m == NULL) 504 return (NULL); 505 } 506 xi = mtod(m, struct xdr_inaddr *); 507 if (xi->atype != txdr_unsigned(1)) { 508 ia->s_addr = INADDR_ANY; 509 goto out; 510 } 511 ip = xi->addr; 512 cp = (u_int8_t *)&ia->s_addr; 513 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 514 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 515 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 516 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 517 518 out: 519 m_adj(m, sizeof(*xi)); 520 return (m); 521 }
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