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