FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_vc.c
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/10.0/sys/rpc/svc_vc.c 249263 2013-04-08 19:03:01Z jhb $");
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/proc.h>
54 #include <sys/protosw.h>
55 #include <sys/queue.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/sx.h>
59 #include <sys/systm.h>
60 #include <sys/uio.h>
61
62 #include <net/vnet.h>
63
64 #include <netinet/tcp.h>
65
66 #include <rpc/rpc.h>
67
68 #include <rpc/krpc.h>
69 #include <rpc/rpc_com.h>
70
71 #include <security/mac/mac_framework.h>
72
73 static bool_t svc_vc_rendezvous_recv(SVCXPRT *, struct rpc_msg *,
74 struct sockaddr **, struct mbuf **);
75 static enum xprt_stat svc_vc_rendezvous_stat(SVCXPRT *);
76 static void svc_vc_rendezvous_destroy(SVCXPRT *);
77 static bool_t svc_vc_null(void);
78 static void svc_vc_destroy(SVCXPRT *);
79 static enum xprt_stat svc_vc_stat(SVCXPRT *);
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 *);
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 *);
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 *))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_reply = svc_vc_reply,
113 .xp_destroy = svc_vc_destroy,
114 .xp_control = svc_vc_control
115 };
116
117 static struct xp_ops svc_vc_backchannel_ops = {
118 .xp_recv = svc_vc_backchannel_recv,
119 .xp_stat = svc_vc_backchannel_stat,
120 .xp_reply = svc_vc_backchannel_reply,
121 .xp_destroy = svc_vc_backchannel_destroy,
122 .xp_control = svc_vc_backchannel_control
123 };
124
125 /*
126 * Usage:
127 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
128 *
129 * Creates, registers, and returns a (rpc) tcp based transporter.
130 * Once *xprt is initialized, it is registered as a transporter
131 * see (svc.h, xprt_register). This routine returns
132 * a NULL if a problem occurred.
133 *
134 * The filedescriptor passed in is expected to refer to a bound, but
135 * not yet connected socket.
136 *
137 * Since streams do buffered io similar to stdio, the caller can specify
138 * how big the send and receive buffers are via the second and third parms;
139 * 0 => use the system default.
140 */
141 SVCXPRT *
142 svc_vc_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
143 size_t recvsize)
144 {
145 SVCXPRT *xprt;
146 struct sockaddr* sa;
147 int error;
148
149 SOCK_LOCK(so);
150 if (so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED)) {
151 SOCK_UNLOCK(so);
152 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa);
153 if (error)
154 return (NULL);
155 xprt = svc_vc_create_conn(pool, so, sa);
156 free(sa, M_SONAME);
157 return (xprt);
158 }
159 SOCK_UNLOCK(so);
160
161 xprt = svc_xprt_alloc();
162 sx_init(&xprt->xp_lock, "xprt->xp_lock");
163 xprt->xp_pool = pool;
164 xprt->xp_socket = so;
165 xprt->xp_p1 = NULL;
166 xprt->xp_p2 = NULL;
167 xprt->xp_ops = &svc_vc_rendezvous_ops;
168
169 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
170 if (error) {
171 goto cleanup_svc_vc_create;
172 }
173
174 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
175 free(sa, M_SONAME);
176
177 xprt_register(xprt);
178
179 solisten(so, SOMAXCONN, curthread);
180
181 SOCKBUF_LOCK(&so->so_rcv);
182 xprt->xp_upcallset = 1;
183 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt);
184 SOCKBUF_UNLOCK(&so->so_rcv);
185
186 return (xprt);
187 cleanup_svc_vc_create:
188 if (xprt)
189 svc_xprt_free(xprt);
190 return (NULL);
191 }
192
193 /*
194 * Create a new transport for a socket optained via soaccept().
195 */
196 SVCXPRT *
197 svc_vc_create_conn(SVCPOOL *pool, struct socket *so, struct sockaddr *raddr)
198 {
199 SVCXPRT *xprt = NULL;
200 struct cf_conn *cd = NULL;
201 struct sockaddr* sa = NULL;
202 struct sockopt opt;
203 int one = 1;
204 int error;
205
206 bzero(&opt, sizeof(struct sockopt));
207 opt.sopt_dir = SOPT_SET;
208 opt.sopt_level = SOL_SOCKET;
209 opt.sopt_name = SO_KEEPALIVE;
210 opt.sopt_val = &one;
211 opt.sopt_valsize = sizeof(one);
212 error = sosetopt(so, &opt);
213 if (error) {
214 return (NULL);
215 }
216
217 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
218 bzero(&opt, sizeof(struct sockopt));
219 opt.sopt_dir = SOPT_SET;
220 opt.sopt_level = IPPROTO_TCP;
221 opt.sopt_name = TCP_NODELAY;
222 opt.sopt_val = &one;
223 opt.sopt_valsize = sizeof(one);
224 error = sosetopt(so, &opt);
225 if (error) {
226 return (NULL);
227 }
228 }
229
230 cd = mem_alloc(sizeof(*cd));
231 cd->strm_stat = XPRT_IDLE;
232
233 xprt = svc_xprt_alloc();
234 sx_init(&xprt->xp_lock, "xprt->xp_lock");
235 xprt->xp_pool = pool;
236 xprt->xp_socket = so;
237 xprt->xp_p1 = cd;
238 xprt->xp_p2 = NULL;
239 xprt->xp_ops = &svc_vc_ops;
240
241 /*
242 * See http://www.connectathon.org/talks96/nfstcp.pdf - client
243 * has a 5 minute timer, server has a 6 minute timer.
244 */
245 xprt->xp_idletimeout = 6 * 60;
246
247 memcpy(&xprt->xp_rtaddr, raddr, raddr->sa_len);
248
249 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
250 if (error)
251 goto cleanup_svc_vc_create;
252
253 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
254 free(sa, M_SONAME);
255
256 xprt_register(xprt);
257
258 SOCKBUF_LOCK(&so->so_rcv);
259 xprt->xp_upcallset = 1;
260 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt);
261 SOCKBUF_UNLOCK(&so->so_rcv);
262
263 /*
264 * Throw the transport into the active list in case it already
265 * has some data buffered.
266 */
267 sx_xlock(&xprt->xp_lock);
268 xprt_active(xprt);
269 sx_xunlock(&xprt->xp_lock);
270
271 return (xprt);
272 cleanup_svc_vc_create:
273 if (xprt) {
274 mem_free(xprt, sizeof(*xprt));
275 }
276 if (cd)
277 mem_free(cd, sizeof(*cd));
278 return (NULL);
279 }
280
281 /*
282 * Create a new transport for a backchannel on a clnt_vc socket.
283 */
284 SVCXPRT *
285 svc_vc_create_backchannel(SVCPOOL *pool)
286 {
287 SVCXPRT *xprt = NULL;
288 struct cf_conn *cd = NULL;
289
290 cd = mem_alloc(sizeof(*cd));
291 cd->strm_stat = XPRT_IDLE;
292
293 xprt = svc_xprt_alloc();
294 sx_init(&xprt->xp_lock, "xprt->xp_lock");
295 xprt->xp_pool = pool;
296 xprt->xp_socket = NULL;
297 xprt->xp_p1 = cd;
298 xprt->xp_p2 = NULL;
299 xprt->xp_ops = &svc_vc_backchannel_ops;
300 return (xprt);
301 }
302
303 /*
304 * This does all of the accept except the final call to soaccept. The
305 * caller will call soaccept after dropping its locks (soaccept may
306 * call malloc).
307 */
308 int
309 svc_vc_accept(struct socket *head, struct socket **sop)
310 {
311 int error = 0;
312 struct socket *so;
313
314 if ((head->so_options & SO_ACCEPTCONN) == 0) {
315 error = EINVAL;
316 goto done;
317 }
318 #ifdef MAC
319 error = mac_socket_check_accept(curthread->td_ucred, head);
320 if (error != 0)
321 goto done;
322 #endif
323 ACCEPT_LOCK();
324 if (TAILQ_EMPTY(&head->so_comp)) {
325 ACCEPT_UNLOCK();
326 error = EWOULDBLOCK;
327 goto done;
328 }
329 so = TAILQ_FIRST(&head->so_comp);
330 KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP"));
331 KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP"));
332
333 /*
334 * Before changing the flags on the socket, we have to bump the
335 * reference count. Otherwise, if the protocol calls sofree(),
336 * the socket will be released due to a zero refcount.
337 * XXX might not need soref() since this is simpler than kern_accept.
338 */
339 SOCK_LOCK(so); /* soref() and so_state update */
340 soref(so); /* file descriptor reference */
341
342 TAILQ_REMOVE(&head->so_comp, so, so_list);
343 head->so_qlen--;
344 so->so_state |= (head->so_state & SS_NBIO);
345 so->so_qstate &= ~SQ_COMP;
346 so->so_head = NULL;
347
348 SOCK_UNLOCK(so);
349 ACCEPT_UNLOCK();
350
351 *sop = so;
352
353 /* connection has been removed from the listen queue */
354 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);
355 done:
356 return (error);
357 }
358
359 /*ARGSUSED*/
360 static bool_t
361 svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg,
362 struct sockaddr **addrp, struct mbuf **mp)
363 {
364 struct socket *so = NULL;
365 struct sockaddr *sa = NULL;
366 int error;
367 SVCXPRT *new_xprt;
368
369 /*
370 * The socket upcall calls xprt_active() which will eventually
371 * cause the server to call us here. We attempt to accept a
372 * connection from the socket and turn it into a new
373 * transport. If the accept fails, we have drained all pending
374 * connections so we call xprt_inactive().
375 */
376 sx_xlock(&xprt->xp_lock);
377
378 error = svc_vc_accept(xprt->xp_socket, &so);
379
380 if (error == EWOULDBLOCK) {
381 /*
382 * We must re-test for new connections after taking
383 * the lock to protect us in the case where a new
384 * connection arrives after our call to accept fails
385 * with EWOULDBLOCK. The pool lock protects us from
386 * racing the upcall after our TAILQ_EMPTY() call
387 * returns false.
388 */
389 ACCEPT_LOCK();
390 mtx_lock(&xprt->xp_pool->sp_lock);
391 if (TAILQ_EMPTY(&xprt->xp_socket->so_comp))
392 xprt_inactive_locked(xprt);
393 mtx_unlock(&xprt->xp_pool->sp_lock);
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(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 sx_destroy(&xprt->xp_lock);
460 if (xprt->xp_socket)
461 (void)soclose(xprt->xp_socket);
462
463 if (xprt->xp_netid)
464 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
465 svc_xprt_free(xprt);
466 }
467
468 static void
469 svc_vc_rendezvous_destroy(SVCXPRT *xprt)
470 {
471
472 svc_vc_destroy_common(xprt);
473 }
474
475 static void
476 svc_vc_destroy(SVCXPRT *xprt)
477 {
478 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1;
479
480 svc_vc_destroy_common(xprt);
481
482 if (cd->mreq)
483 m_freem(cd->mreq);
484 if (cd->mpending)
485 m_freem(cd->mpending);
486 mem_free(cd, sizeof(*cd));
487 }
488
489 static void
490 svc_vc_backchannel_destroy(SVCXPRT *xprt)
491 {
492 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1;
493 struct mbuf *m, *m2;
494
495 svc_xprt_free(xprt);
496 m = cd->mreq;
497 while (m != NULL) {
498 m2 = m;
499 m = m->m_nextpkt;
500 m_freem(m2);
501 }
502 mem_free(cd, sizeof(*cd));
503 }
504
505 /*ARGSUSED*/
506 static bool_t
507 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in)
508 {
509 return (FALSE);
510 }
511
512 static bool_t
513 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in)
514 {
515
516 return (FALSE);
517 }
518
519 static bool_t
520 svc_vc_backchannel_control(SVCXPRT *xprt, const u_int rq, void *in)
521 {
522
523 return (FALSE);
524 }
525
526 static enum xprt_stat
527 svc_vc_stat(SVCXPRT *xprt)
528 {
529 struct cf_conn *cd;
530 struct mbuf *m;
531 size_t n;
532
533 cd = (struct cf_conn *)(xprt->xp_p1);
534
535 if (cd->strm_stat == XPRT_DIED)
536 return (XPRT_DIED);
537
538 /*
539 * Return XPRT_MOREREQS if we have buffered data and we are
540 * mid-record or if we have enough data for a record
541 * marker. Since this is only a hint, we read mpending and
542 * resid outside the lock. We do need to take the lock if we
543 * have to traverse the mbuf chain.
544 */
545 if (cd->mpending) {
546 if (cd->resid)
547 return (XPRT_MOREREQS);
548 n = 0;
549 sx_xlock(&xprt->xp_lock);
550 m = cd->mpending;
551 while (m && n < sizeof(uint32_t)) {
552 n += m->m_len;
553 m = m->m_next;
554 }
555 sx_xunlock(&xprt->xp_lock);
556 if (n >= sizeof(uint32_t))
557 return (XPRT_MOREREQS);
558 }
559
560 if (soreadable(xprt->xp_socket))
561 return (XPRT_MOREREQS);
562
563 return (XPRT_IDLE);
564 }
565
566 static enum xprt_stat
567 svc_vc_backchannel_stat(SVCXPRT *xprt)
568 {
569 struct cf_conn *cd;
570
571 cd = (struct cf_conn *)(xprt->xp_p1);
572
573 if (cd->mreq != NULL)
574 return (XPRT_MOREREQS);
575
576 return (XPRT_IDLE);
577 }
578
579 static bool_t
580 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg,
581 struct sockaddr **addrp, struct mbuf **mp)
582 {
583 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1;
584 struct uio uio;
585 struct mbuf *m;
586 XDR xdrs;
587 int error, rcvflag;
588
589 /*
590 * Serialise access to the socket and our own record parsing
591 * state.
592 */
593 sx_xlock(&xprt->xp_lock);
594
595 for (;;) {
596 /*
597 * If we have an mbuf chain in cd->mpending, try to parse a
598 * record from it, leaving the result in cd->mreq. If we don't
599 * have a complete record, leave the partial result in
600 * cd->mreq and try to read more from the socket.
601 */
602 if (cd->mpending) {
603 /*
604 * If cd->resid is non-zero, we have part of the
605 * record already, otherwise we are expecting a record
606 * marker.
607 */
608 if (!cd->resid) {
609 /*
610 * See if there is enough data buffered to
611 * make up a record marker. Make sure we can
612 * handle the case where the record marker is
613 * split across more than one mbuf.
614 */
615 size_t n = 0;
616 uint32_t header;
617
618 m = cd->mpending;
619 while (n < sizeof(uint32_t) && m) {
620 n += m->m_len;
621 m = m->m_next;
622 }
623 if (n < sizeof(uint32_t))
624 goto readmore;
625 m_copydata(cd->mpending, 0, sizeof(header),
626 (char *)&header);
627 header = ntohl(header);
628 cd->eor = (header & 0x80000000) != 0;
629 cd->resid = header & 0x7fffffff;
630 m_adj(cd->mpending, sizeof(uint32_t));
631 }
632
633 /*
634 * Start pulling off mbufs from cd->mpending
635 * until we either have a complete record or
636 * we run out of data. We use m_split to pull
637 * data - it will pull as much as possible and
638 * split the last mbuf if necessary.
639 */
640 while (cd->mpending && cd->resid) {
641 m = cd->mpending;
642 if (cd->mpending->m_next
643 || cd->mpending->m_len > cd->resid)
644 cd->mpending = m_split(cd->mpending,
645 cd->resid, M_WAITOK);
646 else
647 cd->mpending = NULL;
648 if (cd->mreq)
649 m_last(cd->mreq)->m_next = m;
650 else
651 cd->mreq = m;
652 while (m) {
653 cd->resid -= m->m_len;
654 m = m->m_next;
655 }
656 }
657
658 /*
659 * If cd->resid is zero now, we have managed to
660 * receive a record fragment from the stream. Check
661 * for the end-of-record mark to see if we need more.
662 */
663 if (cd->resid == 0) {
664 if (!cd->eor)
665 continue;
666
667 /*
668 * Success - we have a complete record in
669 * cd->mreq.
670 */
671 xdrmbuf_create(&xdrs, cd->mreq, XDR_DECODE);
672 cd->mreq = NULL;
673 sx_xunlock(&xprt->xp_lock);
674
675 if (! xdr_callmsg(&xdrs, msg)) {
676 XDR_DESTROY(&xdrs);
677 return (FALSE);
678 }
679
680 *addrp = NULL;
681 *mp = xdrmbuf_getall(&xdrs);
682 XDR_DESTROY(&xdrs);
683
684 return (TRUE);
685 }
686 }
687
688 readmore:
689 /*
690 * The socket upcall calls xprt_active() which will eventually
691 * cause the server to call us here. We attempt to
692 * read as much as possible from the socket and put
693 * the result in cd->mpending. If the read fails,
694 * we have drained both cd->mpending and the socket so
695 * we can call xprt_inactive().
696 */
697 uio.uio_resid = 1000000000;
698 uio.uio_td = curthread;
699 m = NULL;
700 rcvflag = MSG_DONTWAIT;
701 error = soreceive(xprt->xp_socket, NULL, &uio, &m, NULL,
702 &rcvflag);
703
704 if (error == EWOULDBLOCK) {
705 /*
706 * We must re-test for readability after
707 * taking the lock to protect us in the case
708 * where a new packet arrives on the socket
709 * after our call to soreceive fails with
710 * EWOULDBLOCK. The pool lock protects us from
711 * racing the upcall after our soreadable()
712 * call returns false.
713 */
714 mtx_lock(&xprt->xp_pool->sp_lock);
715 if (!soreadable(xprt->xp_socket))
716 xprt_inactive_locked(xprt);
717 mtx_unlock(&xprt->xp_pool->sp_lock);
718 sx_xunlock(&xprt->xp_lock);
719 return (FALSE);
720 }
721
722 if (error) {
723 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
724 if (xprt->xp_upcallset) {
725 xprt->xp_upcallset = 0;
726 soupcall_clear(xprt->xp_socket, SO_RCV);
727 }
728 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
729 xprt_inactive(xprt);
730 cd->strm_stat = XPRT_DIED;
731 sx_xunlock(&xprt->xp_lock);
732 return (FALSE);
733 }
734
735 if (!m) {
736 /*
737 * EOF - the other end has closed the socket.
738 */
739 xprt_inactive(xprt);
740 cd->strm_stat = XPRT_DIED;
741 sx_xunlock(&xprt->xp_lock);
742 return (FALSE);
743 }
744
745 if (cd->mpending)
746 m_last(cd->mpending)->m_next = m;
747 else
748 cd->mpending = m;
749 }
750 }
751
752 static bool_t
753 svc_vc_backchannel_recv(SVCXPRT *xprt, struct rpc_msg *msg,
754 struct sockaddr **addrp, struct mbuf **mp)
755 {
756 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1;
757 struct ct_data *ct;
758 struct mbuf *m;
759 XDR xdrs;
760
761 sx_xlock(&xprt->xp_lock);
762 ct = (struct ct_data *)xprt->xp_p2;
763 if (ct == NULL) {
764 sx_xunlock(&xprt->xp_lock);
765 return (FALSE);
766 }
767 mtx_lock(&ct->ct_lock);
768 m = cd->mreq;
769 if (m == NULL) {
770 xprt_inactive(xprt);
771 mtx_unlock(&ct->ct_lock);
772 sx_xunlock(&xprt->xp_lock);
773 return (FALSE);
774 }
775 cd->mreq = m->m_nextpkt;
776 mtx_unlock(&ct->ct_lock);
777 sx_xunlock(&xprt->xp_lock);
778
779 xdrmbuf_create(&xdrs, m, XDR_DECODE);
780 if (! xdr_callmsg(&xdrs, msg)) {
781 XDR_DESTROY(&xdrs);
782 return (FALSE);
783 }
784 *addrp = NULL;
785 *mp = xdrmbuf_getall(&xdrs);
786 XDR_DESTROY(&xdrs);
787 return (TRUE);
788 }
789
790 static bool_t
791 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg,
792 struct sockaddr *addr, struct mbuf *m)
793 {
794 XDR xdrs;
795 struct mbuf *mrep;
796 bool_t stat = TRUE;
797 int error;
798
799 /*
800 * Leave space for record mark.
801 */
802 mrep = m_gethdr(M_WAITOK, MT_DATA);
803 mrep->m_data += sizeof(uint32_t);
804
805 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
806
807 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
808 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
809 if (!xdr_replymsg(&xdrs, msg))
810 stat = FALSE;
811 else
812 xdrmbuf_append(&xdrs, m);
813 } else {
814 stat = xdr_replymsg(&xdrs, msg);
815 }
816
817 if (stat) {
818 m_fixhdr(mrep);
819
820 /*
821 * Prepend a record marker containing the reply length.
822 */
823 M_PREPEND(mrep, sizeof(uint32_t), M_WAITOK);
824 *mtod(mrep, uint32_t *) =
825 htonl(0x80000000 | (mrep->m_pkthdr.len
826 - sizeof(uint32_t)));
827 error = sosend(xprt->xp_socket, NULL, NULL, mrep, NULL,
828 0, curthread);
829 if (!error) {
830 stat = TRUE;
831 }
832 } else {
833 m_freem(mrep);
834 }
835
836 XDR_DESTROY(&xdrs);
837 xprt->xp_p2 = NULL;
838
839 return (stat);
840 }
841
842 static bool_t
843 svc_vc_backchannel_reply(SVCXPRT *xprt, struct rpc_msg *msg,
844 struct sockaddr *addr, struct mbuf *m)
845 {
846 struct ct_data *ct;
847 XDR xdrs;
848 struct mbuf *mrep;
849 bool_t stat = TRUE;
850 int error;
851
852 /*
853 * Leave space for record mark.
854 */
855 mrep = m_gethdr(M_WAITOK, MT_DATA);
856 mrep->m_data += sizeof(uint32_t);
857
858 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
859
860 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
861 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
862 if (!xdr_replymsg(&xdrs, msg))
863 stat = FALSE;
864 else
865 xdrmbuf_append(&xdrs, m);
866 } else {
867 stat = xdr_replymsg(&xdrs, msg);
868 }
869
870 if (stat) {
871 m_fixhdr(mrep);
872
873 /*
874 * Prepend a record marker containing the reply length.
875 */
876 M_PREPEND(mrep, sizeof(uint32_t), M_WAITOK);
877 *mtod(mrep, uint32_t *) =
878 htonl(0x80000000 | (mrep->m_pkthdr.len
879 - sizeof(uint32_t)));
880 sx_xlock(&xprt->xp_lock);
881 ct = (struct ct_data *)xprt->xp_p2;
882 if (ct != NULL)
883 error = sosend(ct->ct_socket, NULL, NULL, mrep, NULL,
884 0, curthread);
885 else
886 error = EPIPE;
887 sx_xunlock(&xprt->xp_lock);
888 if (!error) {
889 stat = TRUE;
890 }
891 } else {
892 m_freem(mrep);
893 }
894
895 XDR_DESTROY(&xdrs);
896
897 return (stat);
898 }
899
900 static bool_t
901 svc_vc_null()
902 {
903
904 return (FALSE);
905 }
906
907 static int
908 svc_vc_soupcall(struct socket *so, void *arg, int waitflag)
909 {
910 SVCXPRT *xprt = (SVCXPRT *) arg;
911
912 xprt_active(xprt);
913 return (SU_OK);
914 }
915
916 #if 0
917 /*
918 * Get the effective UID of the sending process. Used by rpcbind, keyserv
919 * and rpc.yppasswdd on AF_LOCAL.
920 */
921 int
922 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) {
923 int sock, ret;
924 gid_t egid;
925 uid_t euid;
926 struct sockaddr *sa;
927
928 sock = transp->xp_fd;
929 sa = (struct sockaddr *)transp->xp_rtaddr;
930 if (sa->sa_family == AF_LOCAL) {
931 ret = getpeereid(sock, &euid, &egid);
932 if (ret == 0)
933 *uid = euid;
934 return (ret);
935 } else
936 return (-1);
937 }
938 #endif
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