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("$FreeBSD$");
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/sx.h>
58 #include <sys/systm.h>
59 #include <sys/uio.h>
60 #include <netinet/tcp.h>
61
62 #include <rpc/rpc.h>
63
64 #include <rpc/rpc_com.h>
65
66 static bool_t svc_vc_rendezvous_recv(SVCXPRT *, struct rpc_msg *);
67 static enum xprt_stat svc_vc_rendezvous_stat(SVCXPRT *);
68 static void svc_vc_rendezvous_destroy(SVCXPRT *);
69 static bool_t svc_vc_null(void);
70 static void svc_vc_destroy(SVCXPRT *);
71 static enum xprt_stat svc_vc_stat(SVCXPRT *);
72 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
73 static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *);
74 static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *);
75 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
76 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in);
77 static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq,
78 void *in);
79 static SVCXPRT *svc_vc_create_conn(SVCPOOL *pool, struct socket *so,
80 struct sockaddr *raddr);
81 static int svc_vc_accept(struct socket *head, struct socket **sop);
82 static void svc_vc_soupcall(struct socket *so, void *arg, int waitflag);
83
84 static struct xp_ops svc_vc_rendezvous_ops = {
85 .xp_recv = svc_vc_rendezvous_recv,
86 .xp_stat = svc_vc_rendezvous_stat,
87 .xp_getargs = (bool_t (*)(SVCXPRT *, xdrproc_t, void *))svc_vc_null,
88 .xp_reply = (bool_t (*)(SVCXPRT *, struct rpc_msg *))svc_vc_null,
89 .xp_freeargs = (bool_t (*)(SVCXPRT *, xdrproc_t, void *))svc_vc_null,
90 .xp_destroy = svc_vc_rendezvous_destroy,
91 .xp_control = svc_vc_rendezvous_control
92 };
93
94 static struct xp_ops svc_vc_ops = {
95 .xp_recv = svc_vc_recv,
96 .xp_stat = svc_vc_stat,
97 .xp_getargs = svc_vc_getargs,
98 .xp_reply = svc_vc_reply,
99 .xp_freeargs = svc_vc_freeargs,
100 .xp_destroy = svc_vc_destroy,
101 .xp_control = svc_vc_control
102 };
103
104 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
105 enum xprt_stat strm_stat;
106 struct mbuf *mpending; /* unparsed data read from the socket */
107 struct mbuf *mreq; /* current record being built from mpending */
108 uint32_t resid; /* number of bytes needed for fragment */
109 bool_t eor; /* reading last fragment of current record */
110 };
111
112 /*
113 * Usage:
114 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
115 *
116 * Creates, registers, and returns a (rpc) tcp based transporter.
117 * Once *xprt is initialized, it is registered as a transporter
118 * see (svc.h, xprt_register). This routine returns
119 * a NULL if a problem occurred.
120 *
121 * The filedescriptor passed in is expected to refer to a bound, but
122 * not yet connected socket.
123 *
124 * Since streams do buffered io similar to stdio, the caller can specify
125 * how big the send and receive buffers are via the second and third parms;
126 * 0 => use the system default.
127 */
128 SVCXPRT *
129 svc_vc_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
130 size_t recvsize)
131 {
132 SVCXPRT *xprt;
133 struct sockaddr* sa;
134 int error;
135
136 if (so->so_state & SS_ISCONNECTED) {
137 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa);
138 if (error)
139 return (NULL);
140 xprt = svc_vc_create_conn(pool, so, sa);
141 free(sa, M_SONAME);
142 return (xprt);
143 }
144
145 xprt = mem_alloc(sizeof(SVCXPRT));
146 sx_init(&xprt->xp_lock, "xprt->xp_lock");
147 xprt->xp_pool = pool;
148 xprt->xp_socket = so;
149 xprt->xp_p1 = NULL;
150 xprt->xp_p2 = NULL;
151 xprt->xp_p3 = NULL;
152 xprt->xp_verf = _null_auth;
153 xprt->xp_ops = &svc_vc_rendezvous_ops;
154
155 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
156 if (error)
157 goto cleanup_svc_vc_create;
158
159 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
160 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
161 xprt->xp_ltaddr.len = sa->sa_len;
162 memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len);
163 free(sa, M_SONAME);
164
165 xprt->xp_rtaddr.maxlen = 0;
166
167 xprt_register(xprt);
168
169 solisten(so, SOMAXCONN, curthread);
170
171 SOCKBUF_LOCK(&so->so_rcv);
172 so->so_upcallarg = xprt;
173 so->so_upcall = svc_vc_soupcall;
174 so->so_rcv.sb_flags |= SB_UPCALL;
175 SOCKBUF_UNLOCK(&so->so_rcv);
176
177 return (xprt);
178 cleanup_svc_vc_create:
179 if (xprt)
180 mem_free(xprt, sizeof(*xprt));
181 return (NULL);
182 }
183
184 /*
185 * Create a new transport for a socket optained via soaccept().
186 */
187 SVCXPRT *
188 svc_vc_create_conn(SVCPOOL *pool, struct socket *so, struct sockaddr *raddr)
189 {
190 SVCXPRT *xprt = NULL;
191 struct cf_conn *cd = NULL;
192 struct sockaddr* sa = NULL;
193 struct sockopt opt;
194 int one = 1;
195 int error;
196
197 bzero(&opt, sizeof(struct sockopt));
198 opt.sopt_dir = SOPT_SET;
199 opt.sopt_level = SOL_SOCKET;
200 opt.sopt_name = SO_KEEPALIVE;
201 opt.sopt_val = &one;
202 opt.sopt_valsize = sizeof(one);
203 error = sosetopt(so, &opt);
204 if (error)
205 return (NULL);
206
207 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
208 bzero(&opt, sizeof(struct sockopt));
209 opt.sopt_dir = SOPT_SET;
210 opt.sopt_level = IPPROTO_TCP;
211 opt.sopt_name = TCP_NODELAY;
212 opt.sopt_val = &one;
213 opt.sopt_valsize = sizeof(one);
214 error = sosetopt(so, &opt);
215 if (error)
216 return (NULL);
217 }
218
219 cd = mem_alloc(sizeof(*cd));
220 cd->strm_stat = XPRT_IDLE;
221
222 xprt = mem_alloc(sizeof(SVCXPRT));
223 sx_init(&xprt->xp_lock, "xprt->xp_lock");
224 xprt->xp_pool = pool;
225 xprt->xp_socket = so;
226 xprt->xp_p1 = cd;
227 xprt->xp_p2 = NULL;
228 xprt->xp_p3 = NULL;
229 xprt->xp_verf = _null_auth;
230 xprt->xp_ops = &svc_vc_ops;
231
232 xprt->xp_rtaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
233 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
234 xprt->xp_rtaddr.len = raddr->sa_len;
235 memcpy(xprt->xp_rtaddr.buf, raddr, raddr->sa_len);
236
237 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
238 if (error)
239 goto cleanup_svc_vc_create;
240
241 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
242 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
243 xprt->xp_ltaddr.len = sa->sa_len;
244 memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len);
245 free(sa, M_SONAME);
246
247 xprt_register(xprt);
248
249 SOCKBUF_LOCK(&so->so_rcv);
250 so->so_upcallarg = xprt;
251 so->so_upcall = svc_vc_soupcall;
252 so->so_rcv.sb_flags |= SB_UPCALL;
253 SOCKBUF_UNLOCK(&so->so_rcv);
254
255 /*
256 * Throw the transport into the active list in case it already
257 * has some data buffered.
258 */
259 sx_xlock(&xprt->xp_lock);
260 xprt_active(xprt);
261 sx_xunlock(&xprt->xp_lock);
262
263 return (xprt);
264 cleanup_svc_vc_create:
265 if (xprt) {
266 if (xprt->xp_ltaddr.buf)
267 mem_free(xprt->xp_ltaddr.buf,
268 sizeof(struct sockaddr_storage));
269 if (xprt->xp_rtaddr.buf)
270 mem_free(xprt->xp_rtaddr.buf,
271 sizeof(struct sockaddr_storage));
272 mem_free(xprt, sizeof(*xprt));
273 }
274 if (cd)
275 mem_free(cd, sizeof(*cd));
276 return (NULL);
277 }
278
279 /*
280 * This does all of the accept except the final call to soaccept. The
281 * caller will call soaccept after dropping its locks (soaccept may
282 * call malloc).
283 */
284 int
285 svc_vc_accept(struct socket *head, struct socket **sop)
286 {
287 int error = 0;
288 struct socket *so;
289
290 if ((head->so_options & SO_ACCEPTCONN) == 0) {
291 error = EINVAL;
292 goto done;
293 }
294 #ifdef MAC
295 SOCK_LOCK(head);
296 error = mac_socket_check_accept(td->td_ucred, head);
297 SOCK_UNLOCK(head);
298 if (error != 0)
299 goto done;
300 #endif
301 ACCEPT_LOCK();
302 if (TAILQ_EMPTY(&head->so_comp)) {
303 ACCEPT_UNLOCK();
304 error = EWOULDBLOCK;
305 goto done;
306 }
307 so = TAILQ_FIRST(&head->so_comp);
308 KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP"));
309 KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP"));
310
311 /*
312 * Before changing the flags on the socket, we have to bump the
313 * reference count. Otherwise, if the protocol calls sofree(),
314 * the socket will be released due to a zero refcount.
315 * XXX might not need soref() since this is simpler than kern_accept.
316 */
317 SOCK_LOCK(so); /* soref() and so_state update */
318 soref(so); /* file descriptor reference */
319
320 TAILQ_REMOVE(&head->so_comp, so, so_list);
321 head->so_qlen--;
322 so->so_state |= (head->so_state & SS_NBIO);
323 so->so_qstate &= ~SQ_COMP;
324 so->so_head = NULL;
325
326 SOCK_UNLOCK(so);
327 ACCEPT_UNLOCK();
328
329 *sop = so;
330
331 /* connection has been removed from the listen queue */
332 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);
333 done:
334 return (error);
335 }
336
337 /*ARGSUSED*/
338 static bool_t
339 svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg)
340 {
341 struct socket *so = NULL;
342 struct sockaddr *sa = NULL;
343 int error;
344
345 /*
346 * The socket upcall calls xprt_active() which will eventually
347 * cause the server to call us here. We attempt to accept a
348 * connection from the socket and turn it into a new
349 * transport. If the accept fails, we have drained all pending
350 * connections so we call xprt_inactive().
351 */
352 sx_xlock(&xprt->xp_lock);
353
354 error = svc_vc_accept(xprt->xp_socket, &so);
355
356 if (error == EWOULDBLOCK) {
357 /*
358 * We must re-test for new connections after taking
359 * the lock to protect us in the case where a new
360 * connection arrives after our call to accept fails
361 * with EWOULDBLOCK. The pool lock protects us from
362 * racing the upcall after our TAILQ_EMPTY() call
363 * returns false.
364 */
365 ACCEPT_LOCK();
366 mtx_lock(&xprt->xp_pool->sp_lock);
367 if (TAILQ_EMPTY(&xprt->xp_socket->so_comp))
368 xprt_inactive_locked(xprt);
369 mtx_unlock(&xprt->xp_pool->sp_lock);
370 ACCEPT_UNLOCK();
371 sx_xunlock(&xprt->xp_lock);
372 return (FALSE);
373 }
374
375 if (error) {
376 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
377 xprt->xp_socket->so_upcallarg = NULL;
378 xprt->xp_socket->so_upcall = NULL;
379 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
380 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
381 xprt_inactive(xprt);
382 sx_xunlock(&xprt->xp_lock);
383 return (FALSE);
384 }
385
386 sx_xunlock(&xprt->xp_lock);
387
388 sa = 0;
389 error = soaccept(so, &sa);
390
391 if (error) {
392 /*
393 * XXX not sure if I need to call sofree or soclose here.
394 */
395 if (sa)
396 free(sa, M_SONAME);
397 return (FALSE);
398 }
399
400 /*
401 * svc_vc_create_conn will call xprt_register - we don't need
402 * to do anything with the new connection.
403 */
404 if (!svc_vc_create_conn(xprt->xp_pool, so, sa))
405 soclose(so);
406
407 free(sa, M_SONAME);
408
409 return (FALSE); /* there is never an rpc msg to be processed */
410 }
411
412 /*ARGSUSED*/
413 static enum xprt_stat
414 svc_vc_rendezvous_stat(SVCXPRT *xprt)
415 {
416
417 return (XPRT_IDLE);
418 }
419
420 static void
421 svc_vc_destroy_common(SVCXPRT *xprt)
422 {
423 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
424 xprt->xp_socket->so_upcallarg = NULL;
425 xprt->xp_socket->so_upcall = NULL;
426 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
427 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
428
429 xprt_unregister(xprt);
430
431 sx_destroy(&xprt->xp_lock);
432 if (xprt->xp_socket)
433 (void)soclose(xprt->xp_socket);
434
435 if (xprt->xp_rtaddr.buf)
436 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
437 if (xprt->xp_ltaddr.buf)
438 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
439 (void) mem_free(xprt, sizeof (SVCXPRT));
440
441 }
442
443 static void
444 svc_vc_rendezvous_destroy(SVCXPRT *xprt)
445 {
446
447 svc_vc_destroy_common(xprt);
448 }
449
450 static void
451 svc_vc_destroy(SVCXPRT *xprt)
452 {
453 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1;
454
455 svc_vc_destroy_common(xprt);
456
457 if (cd->mreq)
458 m_freem(cd->mreq);
459 if (cd->mpending)
460 m_freem(cd->mpending);
461 mem_free(cd, sizeof(*cd));
462 }
463
464 /*ARGSUSED*/
465 static bool_t
466 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in)
467 {
468 return (FALSE);
469 }
470
471 static bool_t
472 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in)
473 {
474
475 return (FALSE);
476 }
477
478 static enum xprt_stat
479 svc_vc_stat(SVCXPRT *xprt)
480 {
481 struct cf_conn *cd;
482 struct mbuf *m;
483 size_t n;
484
485 cd = (struct cf_conn *)(xprt->xp_p1);
486
487 if (cd->strm_stat == XPRT_DIED)
488 return (XPRT_DIED);
489
490 /*
491 * Return XPRT_MOREREQS if we have buffered data and we are
492 * mid-record or if we have enough data for a record
493 * marker. Since this is only a hint, we read mpending and
494 * resid outside the lock. We do need to take the lock if we
495 * have to traverse the mbuf chain.
496 */
497 if (cd->mpending) {
498 if (cd->resid)
499 return (XPRT_MOREREQS);
500 n = 0;
501 sx_xlock(&xprt->xp_lock);
502 m = cd->mpending;
503 while (m && n < sizeof(uint32_t)) {
504 n += m->m_len;
505 m = m->m_next;
506 }
507 sx_xunlock(&xprt->xp_lock);
508 if (n >= sizeof(uint32_t))
509 return (XPRT_MOREREQS);
510 }
511
512 if (soreadable(xprt->xp_socket))
513 return (XPRT_MOREREQS);
514
515 return (XPRT_IDLE);
516 }
517
518 static bool_t
519 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg)
520 {
521 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1;
522 struct uio uio;
523 struct mbuf *m;
524 int error, rcvflag;
525
526 /*
527 * Serialise access to the socket and our own record parsing
528 * state.
529 */
530 sx_xlock(&xprt->xp_lock);
531
532 for (;;) {
533 /*
534 * If we have an mbuf chain in cd->mpending, try to parse a
535 * record from it, leaving the result in cd->mreq. If we don't
536 * have a complete record, leave the partial result in
537 * cd->mreq and try to read more from the socket.
538 */
539 if (cd->mpending) {
540 /*
541 * If cd->resid is non-zero, we have part of the
542 * record already, otherwise we are expecting a record
543 * marker.
544 */
545 if (!cd->resid) {
546 /*
547 * See if there is enough data buffered to
548 * make up a record marker. Make sure we can
549 * handle the case where the record marker is
550 * split across more than one mbuf.
551 */
552 size_t n = 0;
553 uint32_t header;
554
555 m = cd->mpending;
556 while (n < sizeof(uint32_t) && m) {
557 n += m->m_len;
558 m = m->m_next;
559 }
560 if (n < sizeof(uint32_t))
561 goto readmore;
562 cd->mpending = m_pullup(cd->mpending, sizeof(uint32_t));
563 memcpy(&header, mtod(cd->mpending, uint32_t *),
564 sizeof(header));
565 header = ntohl(header);
566 cd->eor = (header & 0x80000000) != 0;
567 cd->resid = header & 0x7fffffff;
568 m_adj(cd->mpending, sizeof(uint32_t));
569 }
570
571 /*
572 * Start pulling off mbufs from cd->mpending
573 * until we either have a complete record or
574 * we run out of data. We use m_split to pull
575 * data - it will pull as much as possible and
576 * split the last mbuf if necessary.
577 */
578 while (cd->mpending && cd->resid) {
579 m = cd->mpending;
580 cd->mpending = m_split(cd->mpending, cd->resid,
581 M_WAIT);
582 if (cd->mreq)
583 m_last(cd->mreq)->m_next = m;
584 else
585 cd->mreq = m;
586 while (m) {
587 cd->resid -= m->m_len;
588 m = m->m_next;
589 }
590 }
591
592 /*
593 * If cd->resid is zero now, we have managed to
594 * receive a record fragment from the stream. Check
595 * for the end-of-record mark to see if we need more.
596 */
597 if (cd->resid == 0) {
598 if (!cd->eor)
599 continue;
600
601 /*
602 * Success - we have a complete record in
603 * cd->mreq.
604 */
605 xdrmbuf_create(&xprt->xp_xdrreq, cd->mreq, XDR_DECODE);
606 cd->mreq = NULL;
607 sx_xunlock(&xprt->xp_lock);
608 if (! xdr_callmsg(&xprt->xp_xdrreq, msg)) {
609 XDR_DESTROY(&xprt->xp_xdrreq);
610 return (FALSE);
611 }
612 xprt->xp_xid = msg->rm_xid;
613
614 return (TRUE);
615 }
616 }
617
618 readmore:
619 /*
620 * The socket upcall calls xprt_active() which will eventually
621 * cause the server to call us here. We attempt to
622 * read as much as possible from the socket and put
623 * the result in cd->mpending. If the read fails,
624 * we have drained both cd->mpending and the socket so
625 * we can call xprt_inactive().
626 */
627 uio.uio_resid = 1000000000;
628 uio.uio_td = curthread;
629 m = NULL;
630 rcvflag = MSG_DONTWAIT;
631 error = soreceive(xprt->xp_socket, NULL, &uio, &m, NULL,
632 &rcvflag);
633
634 if (error == EWOULDBLOCK) {
635 /*
636 * We must re-test for readability after
637 * taking the lock to protect us in the case
638 * where a new packet arrives on the socket
639 * after our call to soreceive fails with
640 * EWOULDBLOCK. The pool lock protects us from
641 * racing the upcall after our soreadable()
642 * call returns false.
643 */
644 mtx_lock(&xprt->xp_pool->sp_lock);
645 if (!soreadable(xprt->xp_socket))
646 xprt_inactive_locked(xprt);
647 mtx_unlock(&xprt->xp_pool->sp_lock);
648 sx_xunlock(&xprt->xp_lock);
649 return (FALSE);
650 }
651
652 if (error) {
653 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
654 xprt->xp_socket->so_upcallarg = NULL;
655 xprt->xp_socket->so_upcall = NULL;
656 xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
657 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
658 xprt_inactive(xprt);
659 cd->strm_stat = XPRT_DIED;
660 sx_xunlock(&xprt->xp_lock);
661 return (FALSE);
662 }
663
664 if (!m) {
665 /*
666 * EOF - the other end has closed the socket.
667 */
668 xprt_inactive(xprt);
669 cd->strm_stat = XPRT_DIED;
670 sx_xunlock(&xprt->xp_lock);
671 return (FALSE);
672 }
673
674 if (cd->mpending)
675 m_last(cd->mpending)->m_next = m;
676 else
677 cd->mpending = m;
678 }
679 }
680
681 static bool_t
682 svc_vc_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
683 {
684
685 return (xdr_args(&xprt->xp_xdrreq, args_ptr));
686 }
687
688 static bool_t
689 svc_vc_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
690 {
691 XDR xdrs;
692
693 /*
694 * Free the request mbuf here - this allows us to handle
695 * protocols where not all requests have replies
696 * (i.e. NLM). Note that xdrmbuf_destroy handles being called
697 * twice correctly - the mbuf will only be freed once.
698 */
699 XDR_DESTROY(&xprt->xp_xdrreq);
700
701 xdrs.x_op = XDR_FREE;
702 return (xdr_args(&xdrs, args_ptr));
703 }
704
705 static bool_t
706 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg)
707 {
708 struct mbuf *mrep;
709 bool_t stat = FALSE;
710 int error;
711
712 /*
713 * Leave space for record mark.
714 */
715 MGETHDR(mrep, M_WAIT, MT_DATA);
716 MCLGET(mrep, M_WAIT);
717 mrep->m_len = 0;
718 mrep->m_data += sizeof(uint32_t);
719
720 xdrmbuf_create(&xprt->xp_xdrrep, mrep, XDR_ENCODE);
721 msg->rm_xid = xprt->xp_xid;
722 if (xdr_replymsg(&xprt->xp_xdrrep, msg)) {
723 m_fixhdr(mrep);
724
725 /*
726 * Prepend a record marker containing the reply length.
727 */
728 M_PREPEND(mrep, sizeof(uint32_t), M_WAIT);
729 *mtod(mrep, uint32_t *) =
730 htonl(0x80000000 | (mrep->m_pkthdr.len
731 - sizeof(uint32_t)));
732 error = sosend(xprt->xp_socket, NULL, NULL, mrep, NULL,
733 0, curthread);
734 if (!error) {
735 stat = TRUE;
736 }
737 } else {
738 m_freem(mrep);
739 }
740
741 /*
742 * This frees the request mbuf chain as well. The reply mbuf
743 * chain was consumed by sosend.
744 */
745 XDR_DESTROY(&xprt->xp_xdrreq);
746 XDR_DESTROY(&xprt->xp_xdrrep);
747 xprt->xp_p2 = NULL;
748
749 return (stat);
750 }
751
752 static bool_t
753 svc_vc_null()
754 {
755
756 return (FALSE);
757 }
758
759 static void
760 svc_vc_soupcall(struct socket *so, void *arg, int waitflag)
761 {
762 SVCXPRT *xprt = (SVCXPRT *) arg;
763
764 xprt_active(xprt);
765 }
766
767 #if 0
768 /*
769 * Get the effective UID of the sending process. Used by rpcbind, keyserv
770 * and rpc.yppasswdd on AF_LOCAL.
771 */
772 int
773 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) {
774 int sock, ret;
775 gid_t egid;
776 uid_t euid;
777 struct sockaddr *sa;
778
779 sock = transp->xp_fd;
780 sa = (struct sockaddr *)transp->xp_rtaddr.buf;
781 if (sa->sa_family == AF_LOCAL) {
782 ret = getpeereid(sock, &euid, &egid);
783 if (ret == 0)
784 *uid = euid;
785 return (ret);
786 } else
787 return (-1);
788 }
789 #endif
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