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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 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char *sccsid2 = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 33 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 34 #endif 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/10.2/sys/rpc/svc_vc.c 281520 2015-04-14 09:58:10Z mav $"); 37 38 /* 39 * svc_vc.c, Server side for Connection Oriented based RPC. 40 * 41 * Actually implements two flavors of transporter - 42 * a tcp rendezvouser (a listner and connection establisher) 43 * and a record/tcp stream. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/lock.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/mutex.h> 52 #include <sys/proc.h> 53 #include <sys/protosw.h> 54 #include <sys/queue.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/sx.h> 58 #include <sys/systm.h> 59 #include <sys/uio.h> 60 61 #include <net/vnet.h> 62 63 #include <netinet/tcp.h> 64 65 #include <rpc/rpc.h> 66 67 #include <rpc/krpc.h> 68 #include <rpc/rpc_com.h> 69 70 #include <security/mac/mac_framework.h> 71 72 static bool_t svc_vc_rendezvous_recv(SVCXPRT *, struct rpc_msg *, 73 struct sockaddr **, struct mbuf **); 74 static enum xprt_stat svc_vc_rendezvous_stat(SVCXPRT *); 75 static void svc_vc_rendezvous_destroy(SVCXPRT *); 76 static bool_t svc_vc_null(void); 77 static void svc_vc_destroy(SVCXPRT *); 78 static enum xprt_stat svc_vc_stat(SVCXPRT *); 79 static bool_t svc_vc_ack(SVCXPRT *, uint32_t *); 80 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *, 81 struct sockaddr **, struct mbuf **); 82 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *, 83 struct sockaddr *, struct mbuf *, uint32_t *seq); 84 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in); 85 static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq, 86 void *in); 87 static void svc_vc_backchannel_destroy(SVCXPRT *); 88 static enum xprt_stat svc_vc_backchannel_stat(SVCXPRT *); 89 static bool_t svc_vc_backchannel_recv(SVCXPRT *, struct rpc_msg *, 90 struct sockaddr **, struct mbuf **); 91 static bool_t svc_vc_backchannel_reply(SVCXPRT *, struct rpc_msg *, 92 struct sockaddr *, struct mbuf *, uint32_t *); 93 static bool_t svc_vc_backchannel_control(SVCXPRT *xprt, const u_int rq, 94 void *in); 95 static SVCXPRT *svc_vc_create_conn(SVCPOOL *pool, struct socket *so, 96 struct sockaddr *raddr); 97 static int svc_vc_accept(struct socket *head, struct socket **sop); 98 static int svc_vc_soupcall(struct socket *so, void *arg, int waitflag); 99 100 static struct xp_ops svc_vc_rendezvous_ops = { 101 .xp_recv = svc_vc_rendezvous_recv, 102 .xp_stat = svc_vc_rendezvous_stat, 103 .xp_reply = (bool_t (*)(SVCXPRT *, struct rpc_msg *, 104 struct sockaddr *, struct mbuf *, uint32_t *))svc_vc_null, 105 .xp_destroy = svc_vc_rendezvous_destroy, 106 .xp_control = svc_vc_rendezvous_control 107 }; 108 109 static struct xp_ops svc_vc_ops = { 110 .xp_recv = svc_vc_recv, 111 .xp_stat = svc_vc_stat, 112 .xp_ack = svc_vc_ack, 113 .xp_reply = svc_vc_reply, 114 .xp_destroy = svc_vc_destroy, 115 .xp_control = svc_vc_control 116 }; 117 118 static struct xp_ops svc_vc_backchannel_ops = { 119 .xp_recv = svc_vc_backchannel_recv, 120 .xp_stat = svc_vc_backchannel_stat, 121 .xp_reply = svc_vc_backchannel_reply, 122 .xp_destroy = svc_vc_backchannel_destroy, 123 .xp_control = svc_vc_backchannel_control 124 }; 125 126 /* 127 * Usage: 128 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 129 * 130 * Creates, registers, and returns a (rpc) tcp based transporter. 131 * Once *xprt is initialized, it is registered as a transporter 132 * see (svc.h, xprt_register). This routine returns 133 * a NULL if a problem occurred. 134 * 135 * The filedescriptor passed in is expected to refer to a bound, but 136 * not yet connected socket. 137 * 138 * Since streams do buffered io similar to stdio, the caller can specify 139 * how big the send and receive buffers are via the second and third parms; 140 * 0 => use the system default. 141 */ 142 SVCXPRT * 143 svc_vc_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 144 size_t recvsize) 145 { 146 SVCXPRT *xprt; 147 struct sockaddr* sa; 148 int error; 149 150 SOCK_LOCK(so); 151 if (so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED)) { 152 SOCK_UNLOCK(so); 153 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 154 if (error) 155 return (NULL); 156 xprt = svc_vc_create_conn(pool, so, sa); 157 free(sa, M_SONAME); 158 return (xprt); 159 } 160 SOCK_UNLOCK(so); 161 162 xprt = svc_xprt_alloc(); 163 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 164 xprt->xp_pool = pool; 165 xprt->xp_socket = so; 166 xprt->xp_p1 = NULL; 167 xprt->xp_p2 = NULL; 168 xprt->xp_ops = &svc_vc_rendezvous_ops; 169 170 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 171 if (error) { 172 goto cleanup_svc_vc_create; 173 } 174 175 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 176 free(sa, M_SONAME); 177 178 xprt_register(xprt); 179 180 solisten(so, -1, curthread); 181 182 SOCKBUF_LOCK(&so->so_rcv); 183 xprt->xp_upcallset = 1; 184 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt); 185 SOCKBUF_UNLOCK(&so->so_rcv); 186 187 return (xprt); 188 cleanup_svc_vc_create: 189 if (xprt) { 190 sx_destroy(&xprt->xp_lock); 191 svc_xprt_free(xprt); 192 } 193 return (NULL); 194 } 195 196 /* 197 * Create a new transport for a socket optained via soaccept(). 198 */ 199 SVCXPRT * 200 svc_vc_create_conn(SVCPOOL *pool, struct socket *so, struct sockaddr *raddr) 201 { 202 SVCXPRT *xprt = NULL; 203 struct cf_conn *cd = NULL; 204 struct sockaddr* sa = NULL; 205 struct sockopt opt; 206 int one = 1; 207 int error; 208 209 bzero(&opt, sizeof(struct sockopt)); 210 opt.sopt_dir = SOPT_SET; 211 opt.sopt_level = SOL_SOCKET; 212 opt.sopt_name = SO_KEEPALIVE; 213 opt.sopt_val = &one; 214 opt.sopt_valsize = sizeof(one); 215 error = sosetopt(so, &opt); 216 if (error) { 217 return (NULL); 218 } 219 220 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 221 bzero(&opt, sizeof(struct sockopt)); 222 opt.sopt_dir = SOPT_SET; 223 opt.sopt_level = IPPROTO_TCP; 224 opt.sopt_name = TCP_NODELAY; 225 opt.sopt_val = &one; 226 opt.sopt_valsize = sizeof(one); 227 error = sosetopt(so, &opt); 228 if (error) { 229 return (NULL); 230 } 231 } 232 233 cd = mem_alloc(sizeof(*cd)); 234 cd->strm_stat = XPRT_IDLE; 235 236 xprt = svc_xprt_alloc(); 237 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 238 xprt->xp_pool = pool; 239 xprt->xp_socket = so; 240 xprt->xp_p1 = cd; 241 xprt->xp_p2 = NULL; 242 xprt->xp_ops = &svc_vc_ops; 243 244 /* 245 * See http://www.connectathon.org/talks96/nfstcp.pdf - client 246 * has a 5 minute timer, server has a 6 minute timer. 247 */ 248 xprt->xp_idletimeout = 6 * 60; 249 250 memcpy(&xprt->xp_rtaddr, raddr, raddr->sa_len); 251 252 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 253 if (error) 254 goto cleanup_svc_vc_create; 255 256 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 257 free(sa, M_SONAME); 258 259 xprt_register(xprt); 260 261 SOCKBUF_LOCK(&so->so_rcv); 262 xprt->xp_upcallset = 1; 263 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt); 264 SOCKBUF_UNLOCK(&so->so_rcv); 265 266 /* 267 * Throw the transport into the active list in case it already 268 * has some data buffered. 269 */ 270 sx_xlock(&xprt->xp_lock); 271 xprt_active(xprt); 272 sx_xunlock(&xprt->xp_lock); 273 274 return (xprt); 275 cleanup_svc_vc_create: 276 if (xprt) { 277 sx_destroy(&xprt->xp_lock); 278 svc_xprt_free(xprt); 279 } 280 if (cd) 281 mem_free(cd, sizeof(*cd)); 282 return (NULL); 283 } 284 285 /* 286 * Create a new transport for a backchannel on a clnt_vc socket. 287 */ 288 SVCXPRT * 289 svc_vc_create_backchannel(SVCPOOL *pool) 290 { 291 SVCXPRT *xprt = NULL; 292 struct cf_conn *cd = NULL; 293 294 cd = mem_alloc(sizeof(*cd)); 295 cd->strm_stat = XPRT_IDLE; 296 297 xprt = svc_xprt_alloc(); 298 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 299 xprt->xp_pool = pool; 300 xprt->xp_socket = NULL; 301 xprt->xp_p1 = cd; 302 xprt->xp_p2 = NULL; 303 xprt->xp_ops = &svc_vc_backchannel_ops; 304 return (xprt); 305 } 306 307 /* 308 * This does all of the accept except the final call to soaccept. The 309 * caller will call soaccept after dropping its locks (soaccept may 310 * call malloc). 311 */ 312 int 313 svc_vc_accept(struct socket *head, struct socket **sop) 314 { 315 int error = 0; 316 struct socket *so; 317 318 if ((head->so_options & SO_ACCEPTCONN) == 0) { 319 error = EINVAL; 320 goto done; 321 } 322 #ifdef MAC 323 error = mac_socket_check_accept(curthread->td_ucred, head); 324 if (error != 0) 325 goto done; 326 #endif 327 ACCEPT_LOCK(); 328 if (TAILQ_EMPTY(&head->so_comp)) { 329 ACCEPT_UNLOCK(); 330 error = EWOULDBLOCK; 331 goto done; 332 } 333 so = TAILQ_FIRST(&head->so_comp); 334 KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP")); 335 KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP")); 336 337 /* 338 * Before changing the flags on the socket, we have to bump the 339 * reference count. Otherwise, if the protocol calls sofree(), 340 * the socket will be released due to a zero refcount. 341 * XXX might not need soref() since this is simpler than kern_accept. 342 */ 343 SOCK_LOCK(so); /* soref() and so_state update */ 344 soref(so); /* file descriptor reference */ 345 346 TAILQ_REMOVE(&head->so_comp, so, so_list); 347 head->so_qlen--; 348 so->so_state |= (head->so_state & SS_NBIO); 349 so->so_qstate &= ~SQ_COMP; 350 so->so_head = NULL; 351 352 SOCK_UNLOCK(so); 353 ACCEPT_UNLOCK(); 354 355 *sop = so; 356 357 /* connection has been removed from the listen queue */ 358 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); 359 done: 360 return (error); 361 } 362 363 /*ARGSUSED*/ 364 static bool_t 365 svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg, 366 struct sockaddr **addrp, struct mbuf **mp) 367 { 368 struct socket *so = NULL; 369 struct sockaddr *sa = NULL; 370 int error; 371 SVCXPRT *new_xprt; 372 373 /* 374 * The socket upcall calls xprt_active() which will eventually 375 * cause the server to call us here. We attempt to accept a 376 * connection from the socket and turn it into a new 377 * transport. If the accept fails, we have drained all pending 378 * connections so we call xprt_inactive(). 379 */ 380 sx_xlock(&xprt->xp_lock); 381 382 error = svc_vc_accept(xprt->xp_socket, &so); 383 384 if (error == EWOULDBLOCK) { 385 /* 386 * We must re-test for new connections after taking 387 * the lock to protect us in the case where a new 388 * connection arrives after our call to accept fails 389 * with EWOULDBLOCK. 390 */ 391 ACCEPT_LOCK(); 392 if (TAILQ_EMPTY(&xprt->xp_socket->so_comp)) 393 xprt_inactive_self(xprt); 394 ACCEPT_UNLOCK(); 395 sx_xunlock(&xprt->xp_lock); 396 return (FALSE); 397 } 398 399 if (error) { 400 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 401 if (xprt->xp_upcallset) { 402 xprt->xp_upcallset = 0; 403 soupcall_clear(xprt->xp_socket, SO_RCV); 404 } 405 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 406 xprt_inactive_self(xprt); 407 sx_xunlock(&xprt->xp_lock); 408 return (FALSE); 409 } 410 411 sx_xunlock(&xprt->xp_lock); 412 413 sa = 0; 414 error = soaccept(so, &sa); 415 416 if (error) { 417 /* 418 * XXX not sure if I need to call sofree or soclose here. 419 */ 420 if (sa) 421 free(sa, M_SONAME); 422 return (FALSE); 423 } 424 425 /* 426 * svc_vc_create_conn will call xprt_register - we don't need 427 * to do anything with the new connection except derefence it. 428 */ 429 new_xprt = svc_vc_create_conn(xprt->xp_pool, so, sa); 430 if (!new_xprt) { 431 soclose(so); 432 } else { 433 SVC_RELEASE(new_xprt); 434 } 435 436 free(sa, M_SONAME); 437 438 return (FALSE); /* there is never an rpc msg to be processed */ 439 } 440 441 /*ARGSUSED*/ 442 static enum xprt_stat 443 svc_vc_rendezvous_stat(SVCXPRT *xprt) 444 { 445 446 return (XPRT_IDLE); 447 } 448 449 static void 450 svc_vc_destroy_common(SVCXPRT *xprt) 451 { 452 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 453 if (xprt->xp_upcallset) { 454 xprt->xp_upcallset = 0; 455 soupcall_clear(xprt->xp_socket, SO_RCV); 456 } 457 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 458 459 if (xprt->xp_socket) 460 (void)soclose(xprt->xp_socket); 461 462 if (xprt->xp_netid) 463 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 464 svc_xprt_free(xprt); 465 } 466 467 static void 468 svc_vc_rendezvous_destroy(SVCXPRT *xprt) 469 { 470 471 svc_vc_destroy_common(xprt); 472 } 473 474 static void 475 svc_vc_destroy(SVCXPRT *xprt) 476 { 477 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1; 478 479 svc_vc_destroy_common(xprt); 480 481 if (cd->mreq) 482 m_freem(cd->mreq); 483 if (cd->mpending) 484 m_freem(cd->mpending); 485 mem_free(cd, sizeof(*cd)); 486 } 487 488 static void 489 svc_vc_backchannel_destroy(SVCXPRT *xprt) 490 { 491 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1; 492 struct mbuf *m, *m2; 493 494 svc_xprt_free(xprt); 495 m = cd->mreq; 496 while (m != NULL) { 497 m2 = m; 498 m = m->m_nextpkt; 499 m_freem(m2); 500 } 501 mem_free(cd, sizeof(*cd)); 502 } 503 504 /*ARGSUSED*/ 505 static bool_t 506 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in) 507 { 508 return (FALSE); 509 } 510 511 static bool_t 512 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in) 513 { 514 515 return (FALSE); 516 } 517 518 static bool_t 519 svc_vc_backchannel_control(SVCXPRT *xprt, const u_int rq, void *in) 520 { 521 522 return (FALSE); 523 } 524 525 static enum xprt_stat 526 svc_vc_stat(SVCXPRT *xprt) 527 { 528 struct cf_conn *cd; 529 530 cd = (struct cf_conn *)(xprt->xp_p1); 531 532 if (cd->strm_stat == XPRT_DIED) 533 return (XPRT_DIED); 534 535 if (cd->mreq != NULL && cd->resid == 0 && cd->eor) 536 return (XPRT_MOREREQS); 537 538 if (soreadable(xprt->xp_socket)) 539 return (XPRT_MOREREQS); 540 541 return (XPRT_IDLE); 542 } 543 544 static bool_t 545 svc_vc_ack(SVCXPRT *xprt, uint32_t *ack) 546 { 547 548 *ack = atomic_load_acq_32(&xprt->xp_snt_cnt); 549 *ack -= xprt->xp_socket->so_snd.sb_cc; 550 return (TRUE); 551 } 552 553 static enum xprt_stat 554 svc_vc_backchannel_stat(SVCXPRT *xprt) 555 { 556 struct cf_conn *cd; 557 558 cd = (struct cf_conn *)(xprt->xp_p1); 559 560 if (cd->mreq != NULL) 561 return (XPRT_MOREREQS); 562 563 return (XPRT_IDLE); 564 } 565 566 /* 567 * If we have an mbuf chain in cd->mpending, try to parse a record from it, 568 * leaving the result in cd->mreq. If we don't have a complete record, leave 569 * the partial result in cd->mreq and try to read more from the socket. 570 */ 571 static int 572 svc_vc_process_pending(SVCXPRT *xprt) 573 { 574 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1; 575 struct socket *so = xprt->xp_socket; 576 struct mbuf *m; 577 578 /* 579 * If cd->resid is non-zero, we have part of the 580 * record already, otherwise we are expecting a record 581 * marker. 582 */ 583 if (!cd->resid && cd->mpending) { 584 /* 585 * See if there is enough data buffered to 586 * make up a record marker. Make sure we can 587 * handle the case where the record marker is 588 * split across more than one mbuf. 589 */ 590 size_t n = 0; 591 uint32_t header; 592 593 m = cd->mpending; 594 while (n < sizeof(uint32_t) && m) { 595 n += m->m_len; 596 m = m->m_next; 597 } 598 if (n < sizeof(uint32_t)) { 599 so->so_rcv.sb_lowat = sizeof(uint32_t) - n; 600 return (FALSE); 601 } 602 m_copydata(cd->mpending, 0, sizeof(header), 603 (char *)&header); 604 header = ntohl(header); 605 cd->eor = (header & 0x80000000) != 0; 606 cd->resid = header & 0x7fffffff; 607 m_adj(cd->mpending, sizeof(uint32_t)); 608 } 609 610 /* 611 * Start pulling off mbufs from cd->mpending 612 * until we either have a complete record or 613 * we run out of data. We use m_split to pull 614 * data - it will pull as much as possible and 615 * split the last mbuf if necessary. 616 */ 617 while (cd->mpending && cd->resid) { 618 m = cd->mpending; 619 if (cd->mpending->m_next 620 || cd->mpending->m_len > cd->resid) 621 cd->mpending = m_split(cd->mpending, 622 cd->resid, M_WAITOK); 623 else 624 cd->mpending = NULL; 625 if (cd->mreq) 626 m_last(cd->mreq)->m_next = m; 627 else 628 cd->mreq = m; 629 while (m) { 630 cd->resid -= m->m_len; 631 m = m->m_next; 632 } 633 } 634 635 /* 636 * Block receive upcalls if we have more data pending, 637 * otherwise report our need. 638 */ 639 if (cd->mpending) 640 so->so_rcv.sb_lowat = INT_MAX; 641 else 642 so->so_rcv.sb_lowat = 643 imax(1, imin(cd->resid, so->so_rcv.sb_hiwat / 2)); 644 return (TRUE); 645 } 646 647 static bool_t 648 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg, 649 struct sockaddr **addrp, struct mbuf **mp) 650 { 651 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1; 652 struct uio uio; 653 struct mbuf *m; 654 struct socket* so = xprt->xp_socket; 655 XDR xdrs; 656 int error, rcvflag; 657 uint32_t xid_plus_direction[2]; 658 659 /* 660 * Serialise access to the socket and our own record parsing 661 * state. 662 */ 663 sx_xlock(&xprt->xp_lock); 664 665 for (;;) { 666 /* If we have no request ready, check pending queue. */ 667 while (cd->mpending && 668 (cd->mreq == NULL || cd->resid != 0 || !cd->eor)) { 669 if (!svc_vc_process_pending(xprt)) 670 break; 671 } 672 673 /* Process and return complete request in cd->mreq. */ 674 if (cd->mreq != NULL && cd->resid == 0 && cd->eor) { 675 676 /* 677 * Now, check for a backchannel reply. 678 * The XID is in the first uint32_t of the reply 679 * and the message direction is the second one. 680 */ 681 if ((cd->mreq->m_len >= sizeof(xid_plus_direction) || 682 m_length(cd->mreq, NULL) >= 683 sizeof(xid_plus_direction)) && 684 xprt->xp_p2 != NULL) { 685 m_copydata(cd->mreq, 0, 686 sizeof(xid_plus_direction), 687 (char *)xid_plus_direction); 688 xid_plus_direction[0] = 689 ntohl(xid_plus_direction[0]); 690 xid_plus_direction[1] = 691 ntohl(xid_plus_direction[1]); 692 /* Check message direction. */ 693 if (xid_plus_direction[1] == REPLY) { 694 clnt_bck_svccall(xprt->xp_p2, 695 cd->mreq, 696 xid_plus_direction[0]); 697 cd->mreq = NULL; 698 continue; 699 } 700 } 701 702 xdrmbuf_create(&xdrs, cd->mreq, XDR_DECODE); 703 cd->mreq = NULL; 704 705 /* Check for next request in a pending queue. */ 706 svc_vc_process_pending(xprt); 707 if (cd->mreq == NULL || cd->resid != 0) { 708 SOCKBUF_LOCK(&so->so_rcv); 709 if (!soreadable(so)) 710 xprt_inactive_self(xprt); 711 SOCKBUF_UNLOCK(&so->so_rcv); 712 } 713 714 sx_xunlock(&xprt->xp_lock); 715 716 if (! xdr_callmsg(&xdrs, msg)) { 717 XDR_DESTROY(&xdrs); 718 return (FALSE); 719 } 720 721 *addrp = NULL; 722 *mp = xdrmbuf_getall(&xdrs); 723 XDR_DESTROY(&xdrs); 724 725 return (TRUE); 726 } 727 728 /* 729 * The socket upcall calls xprt_active() which will eventually 730 * cause the server to call us here. We attempt to 731 * read as much as possible from the socket and put 732 * the result in cd->mpending. If the read fails, 733 * we have drained both cd->mpending and the socket so 734 * we can call xprt_inactive(). 735 */ 736 uio.uio_resid = 1000000000; 737 uio.uio_td = curthread; 738 m = NULL; 739 rcvflag = MSG_DONTWAIT; 740 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 741 742 if (error == EWOULDBLOCK) { 743 /* 744 * We must re-test for readability after 745 * taking the lock to protect us in the case 746 * where a new packet arrives on the socket 747 * after our call to soreceive fails with 748 * EWOULDBLOCK. 749 */ 750 SOCKBUF_LOCK(&so->so_rcv); 751 if (!soreadable(so)) 752 xprt_inactive_self(xprt); 753 SOCKBUF_UNLOCK(&so->so_rcv); 754 sx_xunlock(&xprt->xp_lock); 755 return (FALSE); 756 } 757 758 if (error) { 759 SOCKBUF_LOCK(&so->so_rcv); 760 if (xprt->xp_upcallset) { 761 xprt->xp_upcallset = 0; 762 soupcall_clear(so, SO_RCV); 763 } 764 SOCKBUF_UNLOCK(&so->so_rcv); 765 xprt_inactive_self(xprt); 766 cd->strm_stat = XPRT_DIED; 767 sx_xunlock(&xprt->xp_lock); 768 return (FALSE); 769 } 770 771 if (!m) { 772 /* 773 * EOF - the other end has closed the socket. 774 */ 775 xprt_inactive_self(xprt); 776 cd->strm_stat = XPRT_DIED; 777 sx_xunlock(&xprt->xp_lock); 778 return (FALSE); 779 } 780 781 if (cd->mpending) 782 m_last(cd->mpending)->m_next = m; 783 else 784 cd->mpending = m; 785 } 786 } 787 788 static bool_t 789 svc_vc_backchannel_recv(SVCXPRT *xprt, struct rpc_msg *msg, 790 struct sockaddr **addrp, struct mbuf **mp) 791 { 792 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1; 793 struct ct_data *ct; 794 struct mbuf *m; 795 XDR xdrs; 796 797 sx_xlock(&xprt->xp_lock); 798 ct = (struct ct_data *)xprt->xp_p2; 799 if (ct == NULL) { 800 sx_xunlock(&xprt->xp_lock); 801 return (FALSE); 802 } 803 mtx_lock(&ct->ct_lock); 804 m = cd->mreq; 805 if (m == NULL) { 806 xprt_inactive_self(xprt); 807 mtx_unlock(&ct->ct_lock); 808 sx_xunlock(&xprt->xp_lock); 809 return (FALSE); 810 } 811 cd->mreq = m->m_nextpkt; 812 mtx_unlock(&ct->ct_lock); 813 sx_xunlock(&xprt->xp_lock); 814 815 xdrmbuf_create(&xdrs, m, XDR_DECODE); 816 if (! xdr_callmsg(&xdrs, msg)) { 817 XDR_DESTROY(&xdrs); 818 return (FALSE); 819 } 820 *addrp = NULL; 821 *mp = xdrmbuf_getall(&xdrs); 822 XDR_DESTROY(&xdrs); 823 return (TRUE); 824 } 825 826 static bool_t 827 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg, 828 struct sockaddr *addr, struct mbuf *m, uint32_t *seq) 829 { 830 XDR xdrs; 831 struct mbuf *mrep; 832 bool_t stat = TRUE; 833 int error, len; 834 835 /* 836 * Leave space for record mark. 837 */ 838 mrep = m_gethdr(M_WAITOK, MT_DATA); 839 mrep->m_data += sizeof(uint32_t); 840 841 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 842 843 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 844 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 845 if (!xdr_replymsg(&xdrs, msg)) 846 stat = FALSE; 847 else 848 xdrmbuf_append(&xdrs, m); 849 } else { 850 stat = xdr_replymsg(&xdrs, msg); 851 } 852 853 if (stat) { 854 m_fixhdr(mrep); 855 856 /* 857 * Prepend a record marker containing the reply length. 858 */ 859 M_PREPEND(mrep, sizeof(uint32_t), M_WAITOK); 860 len = mrep->m_pkthdr.len; 861 *mtod(mrep, uint32_t *) = 862 htonl(0x80000000 | (len - sizeof(uint32_t))); 863 atomic_add_acq_32(&xprt->xp_snd_cnt, len); 864 error = sosend(xprt->xp_socket, NULL, NULL, mrep, NULL, 865 0, curthread); 866 if (!error) { 867 atomic_add_rel_32(&xprt->xp_snt_cnt, len); 868 if (seq) 869 *seq = xprt->xp_snd_cnt; 870 stat = TRUE; 871 } else 872 atomic_subtract_32(&xprt->xp_snd_cnt, len); 873 } else { 874 m_freem(mrep); 875 } 876 877 XDR_DESTROY(&xdrs); 878 879 return (stat); 880 } 881 882 static bool_t 883 svc_vc_backchannel_reply(SVCXPRT *xprt, struct rpc_msg *msg, 884 struct sockaddr *addr, struct mbuf *m, uint32_t *seq) 885 { 886 struct ct_data *ct; 887 XDR xdrs; 888 struct mbuf *mrep; 889 bool_t stat = TRUE; 890 int error; 891 892 /* 893 * Leave space for record mark. 894 */ 895 mrep = m_gethdr(M_WAITOK, MT_DATA); 896 mrep->m_data += sizeof(uint32_t); 897 898 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 899 900 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 901 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 902 if (!xdr_replymsg(&xdrs, msg)) 903 stat = FALSE; 904 else 905 xdrmbuf_append(&xdrs, m); 906 } else { 907 stat = xdr_replymsg(&xdrs, msg); 908 } 909 910 if (stat) { 911 m_fixhdr(mrep); 912 913 /* 914 * Prepend a record marker containing the reply length. 915 */ 916 M_PREPEND(mrep, sizeof(uint32_t), M_WAITOK); 917 *mtod(mrep, uint32_t *) = 918 htonl(0x80000000 | (mrep->m_pkthdr.len 919 - sizeof(uint32_t))); 920 sx_xlock(&xprt->xp_lock); 921 ct = (struct ct_data *)xprt->xp_p2; 922 if (ct != NULL) 923 error = sosend(ct->ct_socket, NULL, NULL, mrep, NULL, 924 0, curthread); 925 else 926 error = EPIPE; 927 sx_xunlock(&xprt->xp_lock); 928 if (!error) { 929 stat = TRUE; 930 } 931 } else { 932 m_freem(mrep); 933 } 934 935 XDR_DESTROY(&xdrs); 936 937 return (stat); 938 } 939 940 static bool_t 941 svc_vc_null() 942 { 943 944 return (FALSE); 945 } 946 947 static int 948 svc_vc_soupcall(struct socket *so, void *arg, int waitflag) 949 { 950 SVCXPRT *xprt = (SVCXPRT *) arg; 951 952 if (soreadable(xprt->xp_socket)) 953 xprt_active(xprt); 954 return (SU_OK); 955 } 956 957 #if 0 958 /* 959 * Get the effective UID of the sending process. Used by rpcbind, keyserv 960 * and rpc.yppasswdd on AF_LOCAL. 961 */ 962 int 963 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) { 964 int sock, ret; 965 gid_t egid; 966 uid_t euid; 967 struct sockaddr *sa; 968 969 sock = transp->xp_fd; 970 sa = (struct sockaddr *)transp->xp_rtaddr; 971 if (sa->sa_family == AF_LOCAL) { 972 ret = getpeereid(sock, &euid, &egid); 973 if (ret == 0) 974 *uid = euid; 975 return (ret); 976 } else 977 return (-1); 978 } 979 #endif
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