Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/rpc/svc_vc.c
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1 /* $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 fvdl Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char *sccsid2 = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 34 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: releng/6.4/sys/rpc/svc_vc.c 178459 2008-04-24 10:46:25Z dfr $"); 38 39 /* 40 * svc_vc.c, Server side for Connection Oriented based RPC. 41 * 42 * Actually implements two flavors of transporter - 43 * a tcp rendezvouser (a listner and connection establisher) 44 * and a record/tcp stream. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/lock.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/mutex.h> 53 #include <sys/protosw.h> 54 #include <sys/queue.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/systm.h> 58 #include <sys/uio.h> 59 #include <netinet/tcp.h> 60 61 #include <rpc/rpc.h> 62 63 #include <rpc/rpc_com.h> 64 65 static bool_t svc_vc_rendezvous_recv(SVCXPRT *, struct rpc_msg *); 66 static enum xprt_stat svc_vc_rendezvous_stat(SVCXPRT *); 67 static void svc_vc_rendezvous_destroy(SVCXPRT *); 68 static bool_t svc_vc_null(void); 69 static void svc_vc_destroy(SVCXPRT *); 70 static enum xprt_stat svc_vc_stat(SVCXPRT *); 71 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *); 72 static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *); 73 static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *); 74 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *); 75 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in); 76 static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq, 77 void *in); 78 static SVCXPRT *svc_vc_create_conn(SVCPOOL *pool, struct socket *so, 79 struct sockaddr *raddr); 80 static int svc_vc_accept(struct socket *head, struct socket **sop); 81 static void svc_vc_soupcall(struct socket *so, void *arg, int waitflag); 82 83 static struct xp_ops svc_vc_rendezvous_ops = { 84 .xp_recv = svc_vc_rendezvous_recv, 85 .xp_stat = svc_vc_rendezvous_stat, 86 .xp_getargs = (bool_t (*)(SVCXPRT *, xdrproc_t, void *))svc_vc_null, 87 .xp_reply = (bool_t (*)(SVCXPRT *, struct rpc_msg *))svc_vc_null, 88 .xp_freeargs = (bool_t (*)(SVCXPRT *, xdrproc_t, void *))svc_vc_null, 89 .xp_destroy = svc_vc_rendezvous_destroy, 90 .xp_control = svc_vc_rendezvous_control 91 }; 92 93 static struct xp_ops svc_vc_ops = { 94 .xp_recv = svc_vc_recv, 95 .xp_stat = svc_vc_stat, 96 .xp_getargs = svc_vc_getargs, 97 .xp_reply = svc_vc_reply, 98 .xp_freeargs = svc_vc_freeargs, 99 .xp_destroy = svc_vc_destroy, 100 .xp_control = svc_vc_control 101 }; 102 103 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */ 104 enum xprt_stat strm_stat; 105 struct mbuf *mpending; /* unparsed data read from the socket */ 106 struct mbuf *mreq; /* current record being built from mpending */ 107 uint32_t resid; /* number of bytes needed for fragment */ 108 bool_t eor; /* reading last fragment of current record */ 109 }; 110 111 /* 112 * Usage: 113 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 114 * 115 * Creates, registers, and returns a (rpc) tcp based transporter. 116 * Once *xprt is initialized, it is registered as a transporter 117 * see (svc.h, xprt_register). This routine returns 118 * a NULL if a problem occurred. 119 * 120 * The filedescriptor passed in is expected to refer to a bound, but 121 * not yet connected socket. 122 * 123 * Since streams do buffered io similar to stdio, the caller can specify 124 * how big the send and receive buffers are via the second and third parms; 125 * 0 => use the system default. 126 */ 127 SVCXPRT * 128 svc_vc_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 129 size_t recvsize) 130 { 131 SVCXPRT *xprt; 132 struct sockaddr* sa; 133 int error; 134 135 xprt = mem_alloc(sizeof(SVCXPRT)); 136 mtx_init(&xprt->xp_lock, "xprt->xp_lock", NULL, MTX_DEF); 137 xprt->xp_pool = pool; 138 xprt->xp_socket = so; 139 xprt->xp_p1 = NULL; 140 xprt->xp_p2 = NULL; 141 xprt->xp_p3 = NULL; 142 xprt->xp_verf = _null_auth; 143 xprt->xp_ops = &svc_vc_rendezvous_ops; 144 145 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 146 if (error) 147 goto cleanup_svc_vc_create; 148 149 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 150 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage); 151 xprt->xp_ltaddr.len = sa->sa_len; 152 memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len); 153 free(sa, M_SONAME); 154 155 xprt->xp_rtaddr.maxlen = 0; 156 157 xprt_register(xprt); 158 159 solisten(so, SOMAXCONN, curthread); 160 161 SOCKBUF_LOCK(&so->so_rcv); 162 so->so_upcallarg = xprt; 163 so->so_upcall = svc_vc_soupcall; 164 so->so_rcv.sb_flags |= SB_UPCALL; 165 SOCKBUF_UNLOCK(&so->so_rcv); 166 167 return (xprt); 168 cleanup_svc_vc_create: 169 if (xprt) 170 mem_free(xprt, sizeof(*xprt)); 171 return (NULL); 172 } 173 174 /* 175 * Create a new transport for a socket optained via soaccept(). 176 */ 177 SVCXPRT * 178 svc_vc_create_conn(SVCPOOL *pool, struct socket *so, struct sockaddr *raddr) 179 { 180 SVCXPRT *xprt = NULL; 181 struct cf_conn *cd = NULL; 182 struct sockaddr* sa = NULL; 183 int error; 184 185 cd = mem_alloc(sizeof(*cd)); 186 cd->strm_stat = XPRT_IDLE; 187 188 xprt = mem_alloc(sizeof(SVCXPRT)); 189 mtx_init(&xprt->xp_lock, "xprt->xp_lock", NULL, MTX_DEF); 190 xprt->xp_pool = pool; 191 xprt->xp_socket = so; 192 xprt->xp_p1 = cd; 193 xprt->xp_p2 = NULL; 194 xprt->xp_p3 = NULL; 195 xprt->xp_verf = _null_auth; 196 xprt->xp_ops = &svc_vc_ops; 197 198 xprt->xp_rtaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 199 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 200 xprt->xp_rtaddr.len = raddr->sa_len; 201 memcpy(xprt->xp_rtaddr.buf, raddr, raddr->sa_len); 202 203 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 204 if (error) 205 goto cleanup_svc_vc_create; 206 207 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage)); 208 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage); 209 xprt->xp_ltaddr.len = sa->sa_len; 210 memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len); 211 free(sa, M_SONAME); 212 213 xprt_register(xprt); 214 215 SOCKBUF_LOCK(&so->so_rcv); 216 so->so_upcallarg = xprt; 217 so->so_upcall = svc_vc_soupcall; 218 so->so_rcv.sb_flags |= SB_UPCALL; 219 SOCKBUF_UNLOCK(&so->so_rcv); 220 221 /* 222 * Throw the transport into the active list in case it already 223 * has some data buffered. 224 */ 225 mtx_lock(&xprt->xp_lock); 226 xprt_active(xprt); 227 mtx_unlock(&xprt->xp_lock); 228 229 return (xprt); 230 cleanup_svc_vc_create: 231 if (xprt) { 232 if (xprt->xp_ltaddr.buf) 233 mem_free(xprt->xp_ltaddr.buf, 234 sizeof(struct sockaddr_storage)); 235 if (xprt->xp_rtaddr.buf) 236 mem_free(xprt->xp_rtaddr.buf, 237 sizeof(struct sockaddr_storage)); 238 mem_free(xprt, sizeof(*xprt)); 239 } 240 if (cd) 241 mem_free(cd, sizeof(*cd)); 242 return (NULL); 243 } 244 245 /* 246 * This does all of the accept except the final call to soaccept. The 247 * caller will call soaccept after dropping its locks (soaccept may 248 * call malloc). 249 */ 250 int 251 svc_vc_accept(struct socket *head, struct socket **sop) 252 { 253 int error = 0; 254 struct socket *so; 255 256 if ((head->so_options & SO_ACCEPTCONN) == 0) { 257 error = EINVAL; 258 goto done; 259 } 260 #ifdef MAC 261 SOCK_LOCK(head); 262 error = mac_socket_check_accept(td->td_ucred, head); 263 SOCK_UNLOCK(head); 264 if (error != 0) 265 goto done; 266 #endif 267 ACCEPT_LOCK(); 268 if (TAILQ_EMPTY(&head->so_comp)) { 269 ACCEPT_UNLOCK(); 270 error = EWOULDBLOCK; 271 goto done; 272 } 273 so = TAILQ_FIRST(&head->so_comp); 274 KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP")); 275 KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP")); 276 277 /* 278 * Before changing the flags on the socket, we have to bump the 279 * reference count. Otherwise, if the protocol calls sofree(), 280 * the socket will be released due to a zero refcount. 281 * XXX might not need soref() since this is simpler than kern_accept. 282 */ 283 SOCK_LOCK(so); /* soref() and so_state update */ 284 soref(so); /* file descriptor reference */ 285 286 TAILQ_REMOVE(&head->so_comp, so, so_list); 287 head->so_qlen--; 288 so->so_state |= (head->so_state & SS_NBIO); 289 so->so_qstate &= ~SQ_COMP; 290 so->so_head = NULL; 291 292 SOCK_UNLOCK(so); 293 ACCEPT_UNLOCK(); 294 295 *sop = so; 296 297 /* connection has been removed from the listen queue */ 298 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); 299 done: 300 return (error); 301 } 302 303 /*ARGSUSED*/ 304 static bool_t 305 svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg) 306 { 307 struct socket *so = NULL; 308 struct sockaddr *sa = NULL; 309 struct sockopt opt; 310 int one = 1; 311 int error; 312 313 /* 314 * The socket upcall calls xprt_active() which will eventually 315 * cause the server to call us here. We attempt to accept a 316 * connection from the socket and turn it into a new 317 * transport. If the accept fails, we have drained all pending 318 * connections so we call xprt_inactive(). 319 * 320 * The lock protects us in the case where a new connection arrives 321 * on the socket after our call to accept fails with 322 * EWOULDBLOCK - the call to xprt_active() in the upcall will 323 * happen only after our call to xprt_inactive() which ensures 324 * that we will remain active. It might be possible to use 325 * SOCKBUF_LOCK for this - its not clear to me what locks are 326 * held during the upcall. 327 */ 328 mtx_lock(&xprt->xp_lock); 329 330 error = svc_vc_accept(xprt->xp_socket, &so); 331 332 if (error == EWOULDBLOCK) { 333 xprt_inactive(xprt); 334 mtx_unlock(&xprt->xp_lock); 335 return (FALSE); 336 } 337 338 if (error) { 339 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 340 xprt->xp_socket->so_upcallarg = NULL; 341 xprt->xp_socket->so_upcall = NULL; 342 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL; 343 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 344 xprt_inactive(xprt); 345 mtx_unlock(&xprt->xp_lock); 346 return (FALSE); 347 } 348 349 mtx_unlock(&xprt->xp_lock); 350 351 sa = 0; 352 error = soaccept(so, &sa); 353 354 if (!error) { 355 bzero(&opt, sizeof(struct sockopt)); 356 opt.sopt_dir = SOPT_SET; 357 opt.sopt_level = IPPROTO_TCP; 358 opt.sopt_name = TCP_NODELAY; 359 opt.sopt_val = &one; 360 opt.sopt_valsize = sizeof(one); 361 error = sosetopt(so, &opt); 362 } 363 364 if (error) { 365 /* 366 * XXX not sure if I need to call sofree or soclose here. 367 */ 368 if (sa) 369 free(sa, M_SONAME); 370 return (FALSE); 371 } 372 373 /* 374 * svc_vc_create_conn will call xprt_register - we don't need 375 * to do anything with the new connection. 376 */ 377 svc_vc_create_conn(xprt->xp_pool, so, sa); 378 free(sa, M_SONAME); 379 380 return (FALSE); /* there is never an rpc msg to be processed */ 381 } 382 383 /*ARGSUSED*/ 384 static enum xprt_stat 385 svc_vc_rendezvous_stat(SVCXPRT *xprt) 386 { 387 388 return (XPRT_IDLE); 389 } 390 391 static void 392 svc_vc_destroy_common(SVCXPRT *xprt) 393 { 394 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 395 xprt->xp_socket->so_upcallarg = NULL; 396 xprt->xp_socket->so_upcall = NULL; 397 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL; 398 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 399 400 xprt_unregister(xprt); 401 402 mtx_destroy(&xprt->xp_lock); 403 if (xprt->xp_socket) 404 (void)soclose(xprt->xp_socket); 405 406 if (xprt->xp_rtaddr.buf) 407 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 408 if (xprt->xp_ltaddr.buf) 409 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 410 (void) mem_free(xprt, sizeof (SVCXPRT)); 411 412 } 413 414 static void 415 svc_vc_rendezvous_destroy(SVCXPRT *xprt) 416 { 417 418 svc_vc_destroy_common(xprt); 419 } 420 421 static void 422 svc_vc_destroy(SVCXPRT *xprt) 423 { 424 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1; 425 426 svc_vc_destroy_common(xprt); 427 428 if (cd->mreq) 429 m_freem(cd->mreq); 430 if (cd->mpending) 431 m_freem(cd->mpending); 432 mem_free(cd, sizeof(*cd)); 433 } 434 435 /*ARGSUSED*/ 436 static bool_t 437 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in) 438 { 439 return (FALSE); 440 } 441 442 static bool_t 443 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in) 444 { 445 446 return (FALSE); 447 } 448 449 static enum xprt_stat 450 svc_vc_stat(SVCXPRT *xprt) 451 { 452 struct cf_conn *cd; 453 struct mbuf *m; 454 size_t n; 455 456 cd = (struct cf_conn *)(xprt->xp_p1); 457 458 if (cd->strm_stat == XPRT_DIED) 459 return (XPRT_DIED); 460 461 /* 462 * Return XPRT_MOREREQS if we have buffered data and we are 463 * mid-record or if we have enough data for a record marker. 464 */ 465 if (cd->mpending) { 466 if (cd->resid) 467 return (XPRT_MOREREQS); 468 n = 0; 469 m = cd->mpending; 470 while (m && n < sizeof(uint32_t)) { 471 n += m->m_len; 472 m = m->m_next; 473 } 474 if (n >= sizeof(uint32_t)) 475 return (XPRT_MOREREQS); 476 } 477 478 return (XPRT_IDLE); 479 } 480 481 static bool_t 482 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg) 483 { 484 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1; 485 struct uio uio; 486 struct mbuf *m; 487 int error, rcvflag; 488 489 for (;;) { 490 /* 491 * If we have an mbuf chain in cd->mpending, try to parse a 492 * record from it, leaving the result in cd->mreq. If we don't 493 * have a complete record, leave the partial result in 494 * cd->mreq and try to read more from the socket. 495 */ 496 if (cd->mpending) { 497 /* 498 * If cd->resid is non-zero, we have part of the 499 * record already, otherwise we are expecting a record 500 * marker. 501 */ 502 if (!cd->resid) { 503 /* 504 * See if there is enough data buffered to 505 * make up a record marker. Make sure we can 506 * handle the case where the record marker is 507 * split across more than one mbuf. 508 */ 509 size_t n = 0; 510 uint32_t header; 511 512 m = cd->mpending; 513 while (n < sizeof(uint32_t) && m) { 514 n += m->m_len; 515 m = m->m_next; 516 } 517 if (n < sizeof(uint32_t)) 518 goto readmore; 519 cd->mpending = m_pullup(cd->mpending, sizeof(uint32_t)); 520 memcpy(&header, mtod(cd->mpending, uint32_t *), 521 sizeof(header)); 522 header = ntohl(header); 523 cd->eor = (header & 0x80000000) != 0; 524 cd->resid = header & 0x7fffffff; 525 m_adj(cd->mpending, sizeof(uint32_t)); 526 } 527 528 /* 529 * Start pulling off mbufs from cd->mpending 530 * until we either have a complete record or 531 * we run out of data. We use m_split to pull 532 * data - it will pull as much as possible and 533 * split the last mbuf if necessary. 534 */ 535 while (cd->mpending && cd->resid) { 536 m = cd->mpending; 537 cd->mpending = m_split(cd->mpending, cd->resid, 538 M_WAIT); 539 if (cd->mreq) 540 m_last(cd->mreq)->m_next = m; 541 else 542 cd->mreq = m; 543 while (m) { 544 cd->resid -= m->m_len; 545 m = m->m_next; 546 } 547 } 548 549 /* 550 * If cd->resid is zero now, we have managed to 551 * receive a record fragment from the stream. Check 552 * for the end-of-record mark to see if we need more. 553 */ 554 if (cd->resid == 0) { 555 if (!cd->eor) 556 continue; 557 558 /* 559 * Success - we have a complete record in 560 * cd->mreq. 561 */ 562 xdrmbuf_create(&xprt->xp_xdrreq, cd->mreq, XDR_DECODE); 563 cd->mreq = NULL; 564 if (! xdr_callmsg(&xprt->xp_xdrreq, msg)) { 565 XDR_DESTROY(&xprt->xp_xdrreq); 566 return (FALSE); 567 } 568 xprt->xp_xid = msg->rm_xid; 569 570 return (TRUE); 571 } 572 } 573 574 readmore: 575 /* 576 * The socket upcall calls xprt_active() which will eventually 577 * cause the server to call us here. We attempt to 578 * read as much as possible from the socket and put 579 * the result in cd->mpending. If the read fails, 580 * we have drained both cd->mpending and the socket so 581 * we can call xprt_inactive(). 582 * 583 * The lock protects us in the case where a new packet arrives 584 * on the socket after our call to soreceive fails with 585 * EWOULDBLOCK - the call to xprt_active() in the upcall will 586 * happen only after our call to xprt_inactive() which ensures 587 * that we will remain active. It might be possible to use 588 * SOCKBUF_LOCK for this - its not clear to me what locks are 589 * held during the upcall. 590 */ 591 mtx_lock(&xprt->xp_lock); 592 593 uio.uio_resid = 1000000000; 594 uio.uio_td = curthread; 595 m = NULL; 596 rcvflag = MSG_DONTWAIT; 597 error = soreceive(xprt->xp_socket, NULL, &uio, &m, NULL, 598 &rcvflag); 599 600 if (error == EWOULDBLOCK) { 601 xprt_inactive(xprt); 602 mtx_unlock(&xprt->xp_lock); 603 return (FALSE); 604 } 605 606 if (error) { 607 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 608 xprt->xp_socket->so_upcallarg = NULL; 609 xprt->xp_socket->so_upcall = NULL; 610 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL; 611 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 612 xprt_inactive(xprt); 613 cd->strm_stat = XPRT_DIED; 614 mtx_unlock(&xprt->xp_lock); 615 return (FALSE); 616 } 617 618 if (!m) { 619 /* 620 * EOF - the other end has closed the socket. 621 */ 622 cd->strm_stat = XPRT_DIED; 623 mtx_unlock(&xprt->xp_lock); 624 return (FALSE); 625 } 626 627 if (cd->mpending) 628 m_last(cd->mpending)->m_next = m; 629 else 630 cd->mpending = m; 631 632 mtx_unlock(&xprt->xp_lock); 633 } 634 } 635 636 static bool_t 637 svc_vc_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr) 638 { 639 640 return (xdr_args(&xprt->xp_xdrreq, args_ptr)); 641 } 642 643 static bool_t 644 svc_vc_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr) 645 { 646 XDR xdrs; 647 648 /* 649 * Free the request mbuf here - this allows us to handle 650 * protocols where not all requests have replies 651 * (i.e. NLM). Note that xdrmbuf_destroy handles being called 652 * twice correctly - the mbuf will only be freed once. 653 */ 654 XDR_DESTROY(&xprt->xp_xdrreq); 655 656 xdrs.x_op = XDR_FREE; 657 return (xdr_args(&xdrs, args_ptr)); 658 } 659 660 static bool_t 661 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg) 662 { 663 struct mbuf *mrep; 664 bool_t stat = FALSE; 665 int error; 666 667 /* 668 * Leave space for record mark. 669 */ 670 MGETHDR(mrep, M_WAIT, MT_DATA); 671 MCLGET(mrep, M_WAIT); 672 mrep->m_len = 0; 673 mrep->m_data += sizeof(uint32_t); 674 675 xdrmbuf_create(&xprt->xp_xdrrep, mrep, XDR_ENCODE); 676 msg->rm_xid = xprt->xp_xid; 677 if (xdr_replymsg(&xprt->xp_xdrrep, msg)) { 678 m_fixhdr(mrep); 679 680 /* 681 * Prepend a record marker containing the reply length. 682 */ 683 M_PREPEND(mrep, sizeof(uint32_t), M_WAIT); 684 *mtod(mrep, uint32_t *) = 685 htonl(0x80000000 | (mrep->m_pkthdr.len 686 - sizeof(uint32_t))); 687 error = sosend(xprt->xp_socket, NULL, NULL, mrep, NULL, 688 0, curthread); 689 if (!error) { 690 stat = TRUE; 691 } 692 } else { 693 m_freem(mrep); 694 } 695 696 /* 697 * This frees the request mbuf chain as well. The reply mbuf 698 * chain was consumed by sosend. 699 */ 700 XDR_DESTROY(&xprt->xp_xdrreq); 701 XDR_DESTROY(&xprt->xp_xdrrep); 702 xprt->xp_p2 = NULL; 703 704 return (stat); 705 } 706 707 static bool_t 708 svc_vc_null() 709 { 710 711 return (FALSE); 712 } 713 714 static void 715 svc_vc_soupcall(struct socket *so, void *arg, int waitflag) 716 { 717 SVCXPRT *xprt = (SVCXPRT *) arg; 718 719 mtx_lock(&xprt->xp_lock); 720 xprt_active(xprt); 721 mtx_unlock(&xprt->xp_lock); 722 } 723 724 #if 0 725 /* 726 * Get the effective UID of the sending process. Used by rpcbind, keyserv 727 * and rpc.yppasswdd on AF_LOCAL. 728 */ 729 int 730 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) { 731 int sock, ret; 732 gid_t egid; 733 uid_t euid; 734 struct sockaddr *sa; 735 736 sock = transp->xp_fd; 737 sa = (struct sockaddr *)transp->xp_rtaddr.buf; 738 if (sa->sa_family == AF_LOCAL) { 739 ret = getpeereid(sock, &euid, &egid); 740 if (ret == 0) 741 *uid = euid; 742 return (ret); 743 } else 744 return (-1); 745 } 746 #endif
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