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kernel - TMPFS - Features, don't sync on umount, enforce snocache on root
[dragonfly.git] / sys / kern / uipc_syscalls.c
blob5aaa424e782e2e7424e2c6b6ce39fd7ca1c803d3
1 /*
2 * Copyright (c) 1982, 1986, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * sendfile(2) and related extensions:
6 * Copyright (c) 1998, David Greenman. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
37 * $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.65.2.17 2003/04/04 17:11:16 tegge Exp $
38 * $DragonFly: src/sys/kern/uipc_syscalls.c,v 1.92 2008/11/26 13:10:56 sephe Exp $
39 */
40
41 #include "opt_ktrace.h"
42 #include "opt_sctp.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/sysproto.h>
48 #include <sys/malloc.h>
49 #include <sys/filedesc.h>
50 #include <sys/event.h>
51 #include <sys/proc.h>
52 #include <sys/fcntl.h>
53 #include <sys/file.h>
54 #include <sys/filio.h>
55 #include <sys/kern_syscall.h>
56 #include <sys/mbuf.h>
57 #include <sys/protosw.h>
58 #include <sys/sfbuf.h>
59 #include <sys/socket.h>
60 #include <sys/socketvar.h>
61 #include <sys/socketops.h>
62 #include <sys/uio.h>
63 #include <sys/vnode.h>
64 #include <sys/lock.h>
65 #include <sys/mount.h>
66 #ifdef KTRACE
67 #include <sys/ktrace.h>
68 #endif
69 #include <vm/vm.h>
70 #include <vm/vm_object.h>
71 #include <vm/vm_page.h>
72 #include <vm/vm_pageout.h>
73 #include <vm/vm_kern.h>
74 #include <vm/vm_extern.h>
75 #include <sys/file2.h>
76 #include <sys/signalvar.h>
77 #include <sys/serialize.h>
78
79 #include <sys/thread2.h>
80 #include <sys/msgport2.h>
81 #include <sys/socketvar2.h>
82 #include <sys/mplock2.h>
83 #include <net/netmsg2.h>
84
85 #ifdef SCTP
86 #include <netinet/sctp_peeloff.h>
87 #endif /* SCTP */
88
89 struct sfbuf_mref {
90 struct sf_buf *sf;
91 int mref_count;
92 };
93
94 static MALLOC_DEFINE(M_SENDFILE, "sendfile", "sendfile sfbuf ref structures");
95
96 /*
97 * System call interface to the socket abstraction.
98 */
99
100 extern struct fileops socketops;
101
102 /*
103 * socket_args(int domain, int type, int protocol)
104 */
105 int
106 kern_socket(int domain, int type, int protocol, int *res)
107 {
108 struct thread *td = curthread;
109 struct filedesc *fdp = td->td_proc->p_fd;
110 struct socket *so;
111 struct file *fp;
112 int fd, error;
113
114 KKASSERT(td->td_lwp);
115
116 error = falloc(td->td_lwp, &fp, &fd);
117 if (error)
118 return (error);
119 error = socreate(domain, &so, type, protocol, td);
120 if (error) {
121 fsetfd(fdp, NULL, fd);
122 } else {
123 fp->f_type = DTYPE_SOCKET;
124 fp->f_flag = FREAD | FWRITE;
125 fp->f_ops = &socketops;
126 fp->f_data = so;
127 *res = fd;
128 fsetfd(fdp, fp, fd);
129 }
130 fdrop(fp);
131 return (error);
132 }
133
134 /*
135 * MPALMOSTSAFE
136 */
137 int
138 sys_socket(struct socket_args *uap)
139 {
140 int error;
141
142 get_mplock();
143 error = kern_socket(uap->domain, uap->type, uap->protocol,
144 &uap->sysmsg_iresult);
145 rel_mplock();
146
147 return (error);
148 }
149
150 int
151 kern_bind(int s, struct sockaddr *sa)
152 {
153 struct thread *td = curthread;
154 struct proc *p = td->td_proc;
155 struct file *fp;
156 int error;
157
158 KKASSERT(p);
159 error = holdsock(p->p_fd, s, &fp);
160 if (error)
161 return (error);
162 error = sobind((struct socket *)fp->f_data, sa, td);
163 fdrop(fp);
164 return (error);
165 }
166
167 /*
168 * bind_args(int s, caddr_t name, int namelen)
169 *
170 * MPALMOSTSAFE
171 */
172 int
173 sys_bind(struct bind_args *uap)
174 {
175 struct sockaddr *sa;
176 int error;
177
178 error = getsockaddr(&sa, uap->name, uap->namelen);
179 if (error)
180 return (error);
181 get_mplock();
182 error = kern_bind(uap->s, sa);
183 rel_mplock();
184 FREE(sa, M_SONAME);
185
186 return (error);
187 }
188
189 int
190 kern_listen(int s, int backlog)
191 {
192 struct thread *td = curthread;
193 struct proc *p = td->td_proc;
194 struct file *fp;
195 int error;
196
197 KKASSERT(p);
198 error = holdsock(p->p_fd, s, &fp);
199 if (error)
200 return (error);
201 error = solisten((struct socket *)fp->f_data, backlog, td);
202 fdrop(fp);
203 return(error);
204 }
205
206 /*
207 * listen_args(int s, int backlog)
208 *
209 * MPALMOSTSAFE
210 */
211 int
212 sys_listen(struct listen_args *uap)
213 {
214 int error;
215
216 get_mplock();
217 error = kern_listen(uap->s, uap->backlog);
218 rel_mplock();
219 return (error);
220 }
221
222 /*
223 * Returns the accepted socket as well.
224 */
225 static boolean_t
226 soaccept_predicate(struct netmsg *msg0)
227 {
228 struct netmsg_so_notify *msg = (struct netmsg_so_notify *)msg0;
229 struct socket *head = msg->nm_so;
230
231 if (head->so_error != 0) {
232 msg->nm_netmsg.nm_lmsg.ms_error = head->so_error;
233 return (TRUE);
234 }
235 if (!TAILQ_EMPTY(&head->so_comp)) {
236 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */
237 msg->nm_so = TAILQ_FIRST(&head->so_comp);
238 TAILQ_REMOVE(&head->so_comp, msg->nm_so, so_list);
239 head->so_qlen--;
240
241 msg->nm_netmsg.nm_lmsg.ms_error = 0;
242 return (TRUE);
243 }
244 if (head->so_state & SS_CANTRCVMORE) {
245 msg->nm_netmsg.nm_lmsg.ms_error = ECONNABORTED;
246 return (TRUE);
247 }
248 if (msg->nm_fflags & FNONBLOCK) {
249 msg->nm_netmsg.nm_lmsg.ms_error = EWOULDBLOCK;
250 return (TRUE);
251 }
252
253 return (FALSE);
254 }
255
256 /*
257 * The second argument to kern_accept() is a handle to a struct sockaddr.
258 * This allows kern_accept() to return a pointer to an allocated struct
259 * sockaddr which must be freed later with FREE(). The caller must
260 * initialize *name to NULL.
261 */
262 int
263 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res)
264 {
265 struct thread *td = curthread;
266 struct filedesc *fdp = td->td_proc->p_fd;
267 struct file *lfp = NULL;
268 struct file *nfp = NULL;
269 struct sockaddr *sa;
270 struct socket *head, *so;
271 struct netmsg_so_notify msg;
272 int fd;
273 u_int fflag; /* type must match fp->f_flag */
274 int error, tmp;
275
276 *res = -1;
277 if (name && namelen && *namelen < 0)
278 return (EINVAL);
279
280 error = holdsock(td->td_proc->p_fd, s, &lfp);
281 if (error)
282 return (error);
283
284 error = falloc(td->td_lwp, &nfp, &fd);
285 if (error) { /* Probably ran out of file descriptors. */
286 fdrop(lfp);
287 return (error);
288 }
289 head = (struct socket *)lfp->f_data;
290 if ((head->so_options & SO_ACCEPTCONN) == 0) {
291 error = EINVAL;
292 goto done;
293 }
294
295 if (fflags & O_FBLOCKING)
296 fflags |= lfp->f_flag & ~FNONBLOCK;
297 else if (fflags & O_FNONBLOCKING)
298 fflags |= lfp->f_flag | FNONBLOCK;
299 else
300 fflags = lfp->f_flag;
301
302 /* optimize for uniprocessor case later XXX JH */
303 netmsg_init_abortable(&msg.nm_netmsg, head, &curthread->td_msgport,
304 0, netmsg_so_notify, netmsg_so_notify_doabort);
305 msg.nm_predicate = soaccept_predicate;
306 msg.nm_fflags = fflags;
307 msg.nm_so = head;
308 msg.nm_etype = NM_REVENT;
309 error = lwkt_domsg(head->so_port, &msg.nm_netmsg.nm_lmsg, PCATCH);
310 if (error)
311 goto done;
312
313 /*
314 * At this point we have the connection that's ready to be accepted.
315 */
316 so = msg.nm_so;
317
318 fflag = lfp->f_flag;
319
320 /* connection has been removed from the listen queue */
321 KNOTE(&head->so_rcv.ssb_sel.si_note, 0);
322
323 so->so_state &= ~SS_COMP;
324 so->so_head = NULL;
325 if (head->so_sigio != NULL)
326 fsetown(fgetown(head->so_sigio), &so->so_sigio);
327
328 nfp->f_type = DTYPE_SOCKET;
329 nfp->f_flag = fflag;
330 nfp->f_ops = &socketops;
331 nfp->f_data = so;
332 /* Sync socket nonblocking/async state with file flags */
333 tmp = fflag & FNONBLOCK;
334 fo_ioctl(nfp, FIONBIO, (caddr_t)&tmp, td->td_ucred, NULL);
335 tmp = fflag & FASYNC;
336 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL);
337
338 sa = NULL;
339 error = soaccept(so, &sa);
340
341 /*
342 * Set the returned name and namelen as applicable. Set the returned
343 * namelen to 0 for older code which might ignore the return value
344 * from accept.
345 */
346 if (error == 0) {
347 if (sa && name && namelen) {
348 if (*namelen > sa->sa_len)
349 *namelen = sa->sa_len;
350 *name = sa;
351 } else {
352 if (sa)
353 FREE(sa, M_SONAME);
354 }
355 }
356
357 done:
358 /*
359 * If an error occured clear the reserved descriptor, else associate
360 * nfp with it.
361 *
362 * Note that *res is normally ignored if an error is returned but
363 * a syscall message will still have access to the result code.
364 */
365 if (error) {
366 fsetfd(fdp, NULL, fd);
367 } else {
368 *res = fd;
369 fsetfd(fdp, nfp, fd);
370 }
371 fdrop(nfp);
372 fdrop(lfp);
373 return (error);
374 }
375
376 /*
377 * accept(int s, caddr_t name, int *anamelen)
378 *
379 * MPALMOSTSAFE
380 */
381 int
382 sys_accept(struct accept_args *uap)
383 {
384 struct sockaddr *sa = NULL;
385 int sa_len;
386 int error;
387
388 if (uap->name) {
389 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len));
390 if (error)
391 return (error);
392
393 get_mplock();
394 error = kern_accept(uap->s, 0, &sa, &sa_len,
395 &uap->sysmsg_iresult);
396 rel_mplock();
397
398 if (error == 0)
399 error = copyout(sa, uap->name, sa_len);
400 if (error == 0) {
401 error = copyout(&sa_len, uap->anamelen,
402 sizeof(*uap->anamelen));
403 }
404 if (sa)
405 FREE(sa, M_SONAME);
406 } else {
407 get_mplock();
408 error = kern_accept(uap->s, 0, NULL, 0,
409 &uap->sysmsg_iresult);
410 rel_mplock();
411 }
412 return (error);
413 }
414
415 /*
416 * extaccept(int s, int fflags, caddr_t name, int *anamelen)
417 *
418 * MPALMOSTSAFE
419 */
420 int
421 sys_extaccept(struct extaccept_args *uap)
422 {
423 struct sockaddr *sa = NULL;
424 int sa_len;
425 int error;
426 int fflags = uap->flags & O_FMASK;
427
428 if (uap->name) {
429 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len));
430 if (error)
431 return (error);
432
433 get_mplock();
434 error = kern_accept(uap->s, fflags, &sa, &sa_len,
435 &uap->sysmsg_iresult);
436 rel_mplock();
437
438 if (error == 0)
439 error = copyout(sa, uap->name, sa_len);
440 if (error == 0) {
441 error = copyout(&sa_len, uap->anamelen,
442 sizeof(*uap->anamelen));
443 }
444 if (sa)
445 FREE(sa, M_SONAME);
446 } else {
447 get_mplock();
448 error = kern_accept(uap->s, fflags, NULL, 0,
449 &uap->sysmsg_iresult);
450 rel_mplock();
451 }
452 return (error);
453 }
454
455
456 /*
457 * Returns TRUE if predicate satisfied.
458 */
459 static boolean_t
460 soconnected_predicate(struct netmsg *msg0)
461 {
462 struct netmsg_so_notify *msg = (struct netmsg_so_notify *)msg0;
463 struct socket *so = msg->nm_so;
464
465 /* check predicate */
466 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) {
467 msg->nm_netmsg.nm_lmsg.ms_error = so->so_error;
468 return (TRUE);
469 }
470
471 return (FALSE);
472 }
473
474 int
475 kern_connect(int s, int fflags, struct sockaddr *sa)
476 {
477 struct thread *td = curthread;
478 struct proc *p = td->td_proc;
479 struct file *fp;
480 struct socket *so;
481 int error, interrupted = 0;
482
483 error = holdsock(p->p_fd, s, &fp);
484 if (error)
485 return (error);
486 so = (struct socket *)fp->f_data;
487
488 if (fflags & O_FBLOCKING)
489 /* fflags &= ~FNONBLOCK; */;
490 else if (fflags & O_FNONBLOCKING)
491 fflags |= FNONBLOCK;
492 else
493 fflags = fp->f_flag;
494
495 if (so->so_state & SS_ISCONNECTING) {
496 error = EALREADY;
497 goto done;
498 }
499 error = soconnect(so, sa, td);
500 if (error)
501 goto bad;
502 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) {
503 error = EINPROGRESS;
504 goto done;
505 }
506 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
507 struct netmsg_so_notify msg;
508
509 netmsg_init_abortable(&msg.nm_netmsg, so,
510 &curthread->td_msgport,
511 0,
512 netmsg_so_notify,
513 netmsg_so_notify_doabort);
514 msg.nm_predicate = soconnected_predicate;
515 msg.nm_so = so;
516 msg.nm_etype = NM_REVENT;
517 error = lwkt_domsg(so->so_port, &msg.nm_netmsg.nm_lmsg, PCATCH);
518 if (error == EINTR || error == ERESTART)
519 interrupted = 1;
520 }
521 if (error == 0) {
522 error = so->so_error;
523 so->so_error = 0;
524 }
525 bad:
526 if (!interrupted)
527 so->so_state &= ~SS_ISCONNECTING;
528 if (error == ERESTART)
529 error = EINTR;
530 done:
531 fdrop(fp);
532 return (error);
533 }
534
535 /*
536 * connect_args(int s, caddr_t name, int namelen)
537 *
538 * MPALMOSTSAFE
539 */
540 int
541 sys_connect(struct connect_args *uap)
542 {
543 struct sockaddr *sa;
544 int error;
545
546 error = getsockaddr(&sa, uap->name, uap->namelen);
547 if (error)
548 return (error);
549 get_mplock();
550 error = kern_connect(uap->s, 0, sa);
551 rel_mplock();
552 FREE(sa, M_SONAME);
553
554 return (error);
555 }
556
557 /*
558 * connect_args(int s, int fflags, caddr_t name, int namelen)
559 *
560 * MPALMOSTSAFE
561 */
562 int
563 sys_extconnect(struct extconnect_args *uap)
564 {
565 struct sockaddr *sa;
566 int error;
567 int fflags = uap->flags & O_FMASK;
568
569 error = getsockaddr(&sa, uap->name, uap->namelen);
570 if (error)
571 return (error);
572 get_mplock();
573 error = kern_connect(uap->s, fflags, sa);
574 rel_mplock();
575 FREE(sa, M_SONAME);
576
577 return (error);
578 }
579
580 int
581 kern_socketpair(int domain, int type, int protocol, int *sv)
582 {
583 struct thread *td = curthread;
584 struct filedesc *fdp;
585 struct file *fp1, *fp2;
586 struct socket *so1, *so2;
587 int fd1, fd2, error;
588
589 fdp = td->td_proc->p_fd;
590 error = socreate(domain, &so1, type, protocol, td);
591 if (error)
592 return (error);
593 error = socreate(domain, &so2, type, protocol, td);
594 if (error)
595 goto free1;
596 error = falloc(td->td_lwp, &fp1, &fd1);
597 if (error)
598 goto free2;
599 sv[0] = fd1;
600 fp1->f_data = so1;
601 error = falloc(td->td_lwp, &fp2, &fd2);
602 if (error)
603 goto free3;
604 fp2->f_data = so2;
605 sv[1] = fd2;
606 error = soconnect2(so1, so2);
607 if (error)
608 goto free4;
609 if (type == SOCK_DGRAM) {
610 /*
611 * Datagram socket connection is asymmetric.
612 */
613 error = soconnect2(so2, so1);
614 if (error)
615 goto free4;
616 }
617 fp1->f_type = fp2->f_type = DTYPE_SOCKET;
618 fp1->f_flag = fp2->f_flag = FREAD|FWRITE;
619 fp1->f_ops = fp2->f_ops = &socketops;
620 fsetfd(fdp, fp1, fd1);
621 fsetfd(fdp, fp2, fd2);
622 fdrop(fp1);
623 fdrop(fp2);
624 return (error);
625 free4:
626 fsetfd(fdp, NULL, fd2);
627 fdrop(fp2);
628 free3:
629 fsetfd(fdp, NULL, fd1);
630 fdrop(fp1);
631 free2:
632 (void)soclose(so2, 0);
633 free1:
634 (void)soclose(so1, 0);
635 return (error);
636 }
637
638 /*
639 * socketpair(int domain, int type, int protocol, int *rsv)
640 *
641 * MPALMOSTSAFE
642 */
643 int
644 sys_socketpair(struct socketpair_args *uap)
645 {
646 int error, sockv[2];
647
648 get_mplock();
649 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv);
650 rel_mplock();
651
652 if (error == 0)
653 error = copyout(sockv, uap->rsv, sizeof(sockv));
654 return (error);
655 }
656
657 int
658 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio,
659 struct mbuf *control, int flags, size_t *res)
660 {
661 struct thread *td = curthread;
662 struct lwp *lp = td->td_lwp;
663 struct proc *p = td->td_proc;
664 struct file *fp;
665 size_t len;
666 int error;
667 struct socket *so;
668 #ifdef KTRACE
669 struct iovec *ktriov = NULL;
670 struct uio ktruio;
671 #endif
672
673 error = holdsock(p->p_fd, s, &fp);
674 if (error)
675 return (error);
676 #ifdef KTRACE
677 if (KTRPOINT(td, KTR_GENIO)) {
678 int iovlen = auio->uio_iovcnt * sizeof (struct iovec);
679
680 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
681 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
682 ktruio = *auio;
683 }
684 #endif
685 len = auio->uio_resid;
686 so = (struct socket *)fp->f_data;
687 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) {
688 if (fp->f_flag & FNONBLOCK)
689 flags |= MSG_FNONBLOCKING;
690 }
691 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td);
692 if (error) {
693 if (auio->uio_resid != len && (error == ERESTART ||
694 error == EINTR || error == EWOULDBLOCK))
695 error = 0;
696 if (error == EPIPE)
697 lwpsignal(p, lp, SIGPIPE);
698 }
699 #ifdef KTRACE
700 if (ktriov != NULL) {
701 if (error == 0) {
702 ktruio.uio_iov = ktriov;
703 ktruio.uio_resid = len - auio->uio_resid;
704 ktrgenio(lp, s, UIO_WRITE, &ktruio, error);
705 }
706 FREE(ktriov, M_TEMP);
707 }
708 #endif
709 if (error == 0)
710 *res = len - auio->uio_resid;
711 fdrop(fp);
712 return (error);
713 }
714
715 /*
716 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen)
717 *
718 * MPALMOSTSAFE
719 */
720 int
721 sys_sendto(struct sendto_args *uap)
722 {
723 struct thread *td = curthread;
724 struct uio auio;
725 struct iovec aiov;
726 struct sockaddr *sa = NULL;
727 int error;
728
729 if (uap->to) {
730 error = getsockaddr(&sa, uap->to, uap->tolen);
731 if (error)
732 return (error);
733 }
734 aiov.iov_base = uap->buf;
735 aiov.iov_len = uap->len;
736 auio.uio_iov = &aiov;
737 auio.uio_iovcnt = 1;
738 auio.uio_offset = 0;
739 auio.uio_resid = uap->len;
740 auio.uio_segflg = UIO_USERSPACE;
741 auio.uio_rw = UIO_WRITE;
742 auio.uio_td = td;
743
744 get_mplock();
745 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags,
746 &uap->sysmsg_szresult);
747 rel_mplock();
748
749 if (sa)
750 FREE(sa, M_SONAME);
751 return (error);
752 }
753
754 /*
755 * sendmsg_args(int s, caddr_t msg, int flags)
756 *
757 * MPALMOSTSAFE
758 */
759 int
760 sys_sendmsg(struct sendmsg_args *uap)
761 {
762 struct thread *td = curthread;
763 struct msghdr msg;
764 struct uio auio;
765 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
766 struct sockaddr *sa = NULL;
767 struct mbuf *control = NULL;
768 int error;
769
770 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg));
771 if (error)
772 return (error);
773
774 /*
775 * Conditionally copyin msg.msg_name.
776 */
777 if (msg.msg_name) {
778 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen);
779 if (error)
780 return (error);
781 }
782
783 /*
784 * Populate auio.
785 */
786 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen,
787 &auio.uio_resid);
788 if (error)
789 goto cleanup2;
790 auio.uio_iov = iov;
791 auio.uio_iovcnt = msg.msg_iovlen;
792 auio.uio_offset = 0;
793 auio.uio_segflg = UIO_USERSPACE;
794 auio.uio_rw = UIO_WRITE;
795 auio.uio_td = td;
796
797 /*
798 * Conditionally copyin msg.msg_control.
799 */
800 if (msg.msg_control) {
801 if (msg.msg_controllen < sizeof(struct cmsghdr) ||
802 msg.msg_controllen > MLEN) {
803 error = EINVAL;
804 goto cleanup;
805 }
806 control = m_get(MB_WAIT, MT_CONTROL);
807 if (control == NULL) {
808 error = ENOBUFS;
809 goto cleanup;
810 }
811 control->m_len = msg.msg_controllen;
812 error = copyin(msg.msg_control, mtod(control, caddr_t),
813 msg.msg_controllen);
814 if (error) {
815 m_free(control);
816 goto cleanup;
817 }
818 }
819
820 get_mplock();
821 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags,
822 &uap->sysmsg_szresult);
823 rel_mplock();
824
825 cleanup:
826 iovec_free(&iov, aiov);
827 cleanup2:
828 if (sa)
829 FREE(sa, M_SONAME);
830 return (error);
831 }
832
833 /*
834 * kern_recvmsg() takes a handle to sa and control. If the handle is non-
835 * null, it returns a dynamically allocated struct sockaddr and an mbuf.
836 * Don't forget to FREE() and m_free() these if they are returned.
837 */
838 int
839 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio,
840 struct mbuf **control, int *flags, size_t *res)
841 {
842 struct thread *td = curthread;
843 struct proc *p = td->td_proc;
844 struct file *fp;
845 size_t len;
846 int error;
847 int lflags;
848 struct socket *so;
849 #ifdef KTRACE
850 struct iovec *ktriov = NULL;
851 struct uio ktruio;
852 #endif
853
854 error = holdsock(p->p_fd, s, &fp);
855 if (error)
856 return (error);
857 #ifdef KTRACE
858 if (KTRPOINT(td, KTR_GENIO)) {
859 int iovlen = auio->uio_iovcnt * sizeof (struct iovec);
860
861 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
862 bcopy(auio->uio_iov, ktriov, iovlen);
863 ktruio = *auio;
864 }
865 #endif
866 len = auio->uio_resid;
867 so = (struct socket *)fp->f_data;
868
869 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) {
870 if (fp->f_flag & FNONBLOCK) {
871 if (flags) {
872 *flags |= MSG_FNONBLOCKING;
873 } else {
874 lflags = MSG_FNONBLOCKING;
875 flags = &lflags;
876 }
877 }
878 }
879
880 error = so_pru_soreceive(so, sa, auio, NULL, control, flags);
881 if (error) {
882 if (auio->uio_resid != len && (error == ERESTART ||
883 error == EINTR || error == EWOULDBLOCK))
884 error = 0;
885 }
886 #ifdef KTRACE
887 if (ktriov != NULL) {
888 if (error == 0) {
889 ktruio.uio_iov = ktriov;
890 ktruio.uio_resid = len - auio->uio_resid;
891 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error);
892 }
893 FREE(ktriov, M_TEMP);
894 }
895 #endif
896 if (error == 0)
897 *res = len - auio->uio_resid;
898 fdrop(fp);
899 return (error);
900 }
901
902 /*
903 * recvfrom_args(int s, caddr_t buf, size_t len, int flags,
904 * caddr_t from, int *fromlenaddr)
905 *
906 * MPALMOSTSAFE
907 */
908 int
909 sys_recvfrom(struct recvfrom_args *uap)
910 {
911 struct thread *td = curthread;
912 struct uio auio;
913 struct iovec aiov;
914 struct sockaddr *sa = NULL;
915 int error, fromlen;
916
917 if (uap->from && uap->fromlenaddr) {
918 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen));
919 if (error)
920 return (error);
921 if (fromlen < 0)
922 return (EINVAL);
923 } else {
924 fromlen = 0;
925 }
926 aiov.iov_base = uap->buf;
927 aiov.iov_len = uap->len;
928 auio.uio_iov = &aiov;
929 auio.uio_iovcnt = 1;
930 auio.uio_offset = 0;
931 auio.uio_resid = uap->len;
932 auio.uio_segflg = UIO_USERSPACE;
933 auio.uio_rw = UIO_READ;
934 auio.uio_td = td;
935
936 get_mplock();
937 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL,
938 &uap->flags, &uap->sysmsg_szresult);
939 rel_mplock();
940
941 if (error == 0 && uap->from) {
942 /* note: sa may still be NULL */
943 if (sa) {
944 fromlen = MIN(fromlen, sa->sa_len);
945 error = copyout(sa, uap->from, fromlen);
946 } else {
947 fromlen = 0;
948 }
949 if (error == 0) {
950 error = copyout(&fromlen, uap->fromlenaddr,
951 sizeof(fromlen));
952 }
953 }
954 if (sa)
955 FREE(sa, M_SONAME);
956
957 return (error);
958 }
959
960 /*
961 * recvmsg_args(int s, struct msghdr *msg, int flags)
962 *
963 * MPALMOSTSAFE
964 */
965 int
966 sys_recvmsg(struct recvmsg_args *uap)
967 {
968 struct thread *td = curthread;
969 struct msghdr msg;
970 struct uio auio;
971 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
972 struct mbuf *m, *control = NULL;
973 struct sockaddr *sa = NULL;
974 caddr_t ctlbuf;
975 socklen_t *ufromlenp, *ucontrollenp;
976 int error, fromlen, controllen, len, flags, *uflagsp;
977
978 /*
979 * This copyin handles everything except the iovec.
980 */
981 error = copyin(uap->msg, &msg, sizeof(msg));
982 if (error)
983 return (error);
984
985 if (msg.msg_name && msg.msg_namelen < 0)
986 return (EINVAL);
987 if (msg.msg_control && msg.msg_controllen < 0)
988 return (EINVAL);
989
990 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr,
991 msg_namelen));
992 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr,
993 msg_controllen));
994 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr,
995 msg_flags));
996
997 /*
998 * Populate auio.
999 */
1000 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen,
1001 &auio.uio_resid);
1002 if (error)
1003 return (error);
1004 auio.uio_iov = iov;
1005 auio.uio_iovcnt = msg.msg_iovlen;
1006 auio.uio_offset = 0;
1007 auio.uio_segflg = UIO_USERSPACE;
1008 auio.uio_rw = UIO_READ;
1009 auio.uio_td = td;
1010
1011 flags = uap->flags;
1012
1013 get_mplock();
1014 error = kern_recvmsg(uap->s,
1015 (msg.msg_name ? &sa : NULL), &auio,
1016 (msg.msg_control ? &control : NULL), &flags,
1017 &uap->sysmsg_szresult);
1018 rel_mplock();
1019
1020 /*
1021 * Conditionally copyout the name and populate the namelen field.
1022 */
1023 if (error == 0 && msg.msg_name) {
1024 /* note: sa may still be NULL */
1025 if (sa != NULL) {
1026 fromlen = MIN(msg.msg_namelen, sa->sa_len);
1027 error = copyout(sa, msg.msg_name, fromlen);
1028 } else {
1029 fromlen = 0;
1030 }
1031 if (error == 0)
1032 error = copyout(&fromlen, ufromlenp,
1033 sizeof(*ufromlenp));
1034 }
1035
1036 /*
1037 * Copyout msg.msg_control and msg.msg_controllen.
1038 */
1039 if (error == 0 && msg.msg_control) {
1040 len = msg.msg_controllen;
1041 m = control;
1042 ctlbuf = (caddr_t)msg.msg_control;
1043
1044 while(m && len > 0) {
1045 unsigned int tocopy;
1046
1047 if (len >= m->m_len) {
1048 tocopy = m->m_len;
1049 } else {
1050 msg.msg_flags |= MSG_CTRUNC;
1051 tocopy = len;
1052 }
1053
1054 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy);
1055 if (error)
1056 goto cleanup;
1057
1058 ctlbuf += tocopy;
1059 len -= tocopy;
1060 m = m->m_next;
1061 }
1062 controllen = ctlbuf - (caddr_t)msg.msg_control;
1063 error = copyout(&controllen, ucontrollenp,
1064 sizeof(*ucontrollenp));
1065 }
1066
1067 if (error == 0)
1068 error = copyout(&flags, uflagsp, sizeof(*uflagsp));
1069
1070 cleanup:
1071 if (sa)
1072 FREE(sa, M_SONAME);
1073 iovec_free(&iov, aiov);
1074 if (control)
1075 m_freem(control);
1076 return (error);
1077 }
1078
1079 /*
1080 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an
1081 * in kernel pointer instead of a userland pointer. This allows us
1082 * to manipulate socket options in the emulation code.
1083 */
1084 int
1085 kern_setsockopt(int s, struct sockopt *sopt)
1086 {
1087 struct thread *td = curthread;
1088 struct proc *p = td->td_proc;
1089 struct file *fp;
1090 int error;
1091
1092 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0)
1093 return (EFAULT);
1094 if (sopt->sopt_valsize < 0)
1095 return (EINVAL);
1096
1097 error = holdsock(p->p_fd, s, &fp);
1098 if (error)
1099 return (error);
1100
1101 error = sosetopt((struct socket *)fp->f_data, sopt);
1102 fdrop(fp);
1103 return (error);
1104 }
1105
1106 /*
1107 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize)
1108 *
1109 * MPALMOSTSAFE
1110 */
1111 int
1112 sys_setsockopt(struct setsockopt_args *uap)
1113 {
1114 struct thread *td = curthread;
1115 struct sockopt sopt;
1116 int error;
1117
1118 sopt.sopt_level = uap->level;
1119 sopt.sopt_name = uap->name;
1120 sopt.sopt_valsize = uap->valsize;
1121 sopt.sopt_td = td;
1122 sopt.sopt_val = NULL;
1123
1124 if (sopt.sopt_valsize < 0 || sopt.sopt_valsize > SOMAXOPT_SIZE)
1125 return (EINVAL);
1126 if (uap->val) {
1127 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK);
1128 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize);
1129 if (error)
1130 goto out;
1131 }
1132
1133 get_mplock();
1134 error = kern_setsockopt(uap->s, &sopt);
1135 rel_mplock();
1136 out:
1137 if (uap->val)
1138 kfree(sopt.sopt_val, M_TEMP);
1139 return(error);
1140 }
1141
1142 /*
1143 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an
1144 * in kernel pointer instead of a userland pointer. This allows us
1145 * to manipulate socket options in the emulation code.
1146 */
1147 int
1148 kern_getsockopt(int s, struct sockopt *sopt)
1149 {
1150 struct thread *td = curthread;
1151 struct proc *p = td->td_proc;
1152 struct file *fp;
1153 int error;
1154
1155 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0)
1156 return (EFAULT);
1157 if (sopt->sopt_valsize < 0 || sopt->sopt_valsize > SOMAXOPT_SIZE)
1158 return (EINVAL);
1159
1160 error = holdsock(p->p_fd, s, &fp);
1161 if (error)
1162 return (error);
1163
1164 error = sogetopt((struct socket *)fp->f_data, sopt);
1165 fdrop(fp);
1166 return (error);
1167 }
1168
1169 /*
1170 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize)
1171 *
1172 * MPALMOSTSAFE
1173 */
1174 int
1175 sys_getsockopt(struct getsockopt_args *uap)
1176 {
1177 struct thread *td = curthread;
1178 struct sockopt sopt;
1179 int error, valsize;
1180
1181 if (uap->val) {
1182 error = copyin(uap->avalsize, &valsize, sizeof(valsize));
1183 if (error)
1184 return (error);
1185 } else {
1186 valsize = 0;
1187 }
1188
1189 sopt.sopt_level = uap->level;
1190 sopt.sopt_name = uap->name;
1191 sopt.sopt_valsize = valsize;
1192 sopt.sopt_td = td;
1193 sopt.sopt_val = NULL;
1194
1195 if (sopt.sopt_valsize < 0 || sopt.sopt_valsize > SOMAXOPT_SIZE)
1196 return (EINVAL);
1197 if (uap->val) {
1198 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK);
1199 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize);
1200 if (error)
1201 goto out;
1202 }
1203
1204 get_mplock();
1205 error = kern_getsockopt(uap->s, &sopt);
1206 rel_mplock();
1207 if (error)
1208 goto out;
1209 valsize = sopt.sopt_valsize;
1210 error = copyout(&valsize, uap->avalsize, sizeof(valsize));
1211 if (error)
1212 goto out;
1213 if (uap->val)
1214 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize);
1215 out:
1216 if (uap->val)
1217 kfree(sopt.sopt_val, M_TEMP);
1218 return (error);
1219 }
1220
1221 /*
1222 * The second argument to kern_getsockname() is a handle to a struct sockaddr.
1223 * This allows kern_getsockname() to return a pointer to an allocated struct
1224 * sockaddr which must be freed later with FREE(). The caller must
1225 * initialize *name to NULL.
1226 */
1227 int
1228 kern_getsockname(int s, struct sockaddr **name, int *namelen)
1229 {
1230 struct thread *td = curthread;
1231 struct proc *p = td->td_proc;
1232 struct file *fp;
1233 struct socket *so;
1234 struct sockaddr *sa = NULL;
1235 int error;
1236
1237 error = holdsock(p->p_fd, s, &fp);
1238 if (error)
1239 return (error);
1240 if (*namelen < 0) {
1241 fdrop(fp);
1242 return (EINVAL);
1243 }
1244 so = (struct socket *)fp->f_data;
1245 error = so_pru_sockaddr(so, &sa);
1246 if (error == 0) {
1247 if (sa == NULL) {
1248 *namelen = 0;
1249 } else {
1250 *namelen = MIN(*namelen, sa->sa_len);
1251 *name = sa;
1252 }
1253 }
1254
1255 fdrop(fp);
1256 return (error);
1257 }
1258
1259 /*
1260 * getsockname_args(int fdes, caddr_t asa, int *alen)
1261 *
1262 * Get socket name.
1263 *
1264 * MPALMOSTSAFE
1265 */
1266 int
1267 sys_getsockname(struct getsockname_args *uap)
1268 {
1269 struct sockaddr *sa = NULL;
1270 int error, sa_len;
1271
1272 error = copyin(uap->alen, &sa_len, sizeof(sa_len));
1273 if (error)
1274 return (error);
1275
1276 get_mplock();
1277 error = kern_getsockname(uap->fdes, &sa, &sa_len);
1278 rel_mplock();
1279
1280 if (error == 0)
1281 error = copyout(sa, uap->asa, sa_len);
1282 if (error == 0)
1283 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen));
1284 if (sa)
1285 FREE(sa, M_SONAME);
1286 return (error);
1287 }
1288
1289 /*
1290 * The second argument to kern_getpeername() is a handle to a struct sockaddr.
1291 * This allows kern_getpeername() to return a pointer to an allocated struct
1292 * sockaddr which must be freed later with FREE(). The caller must
1293 * initialize *name to NULL.
1294 */
1295 int
1296 kern_getpeername(int s, struct sockaddr **name, int *namelen)
1297 {
1298 struct thread *td = curthread;
1299 struct proc *p = td->td_proc;
1300 struct file *fp;
1301 struct socket *so;
1302 struct sockaddr *sa = NULL;
1303 int error;
1304
1305 error = holdsock(p->p_fd, s, &fp);
1306 if (error)
1307 return (error);
1308 if (*namelen < 0) {
1309 fdrop(fp);
1310 return (EINVAL);
1311 }
1312 so = (struct socket *)fp->f_data;
1313 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1314 fdrop(fp);
1315 return (ENOTCONN);
1316 }
1317 error = so_pru_peeraddr(so, &sa);
1318 if (error == 0) {
1319 if (sa == NULL) {
1320 *namelen = 0;
1321 } else {
1322 *namelen = MIN(*namelen, sa->sa_len);
1323 *name = sa;
1324 }
1325 }
1326
1327 fdrop(fp);
1328 return (error);
1329 }
1330
1331 /*
1332 * getpeername_args(int fdes, caddr_t asa, int *alen)
1333 *
1334 * Get name of peer for connected socket.
1335 *
1336 * MPALMOSTSAFE
1337 */
1338 int
1339 sys_getpeername(struct getpeername_args *uap)
1340 {
1341 struct sockaddr *sa = NULL;
1342 int error, sa_len;
1343
1344 error = copyin(uap->alen, &sa_len, sizeof(sa_len));
1345 if (error)
1346 return (error);
1347
1348 get_mplock();
1349 error = kern_getpeername(uap->fdes, &sa, &sa_len);
1350 rel_mplock();
1351
1352 if (error == 0)
1353 error = copyout(sa, uap->asa, sa_len);
1354 if (error == 0)
1355 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen));
1356 if (sa)
1357 FREE(sa, M_SONAME);
1358 return (error);
1359 }
1360
1361 int
1362 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len)
1363 {
1364 struct sockaddr *sa;
1365 int error;
1366
1367 *namp = NULL;
1368 if (len > SOCK_MAXADDRLEN)
1369 return ENAMETOOLONG;
1370 if (len < offsetof(struct sockaddr, sa_data[0]))
1371 return EDOM;
1372 MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK);
1373 error = copyin(uaddr, sa, len);
1374 if (error) {
1375 FREE(sa, M_SONAME);
1376 } else {
1377 #if BYTE_ORDER != BIG_ENDIAN
1378 /*
1379 * The bind(), connect(), and sendto() syscalls were not
1380 * versioned for COMPAT_43. Thus, this check must stay.
1381 */
1382 if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
1383 sa->sa_family = sa->sa_len;
1384 #endif
1385 sa->sa_len = len;
1386 *namp = sa;
1387 }
1388 return error;
1389 }
1390
1391 /*
1392 * Detach a mapped page and release resources back to the system.
1393 * We must release our wiring and if the object is ripped out
1394 * from under the vm_page we become responsible for freeing the
1395 * page. These routines must be MPSAFE.
1396 *
1397 * XXX HACK XXX TEMPORARY UNTIL WE IMPLEMENT EXT MBUF REFERENCE COUNTING
1398 *
1399 * XXX vm_page_*() routines are not MPSAFE yet, the MP lock is required.
1400 */
1401 static void
1402 sf_buf_mref(void *arg)
1403 {
1404 struct sfbuf_mref *sfm = arg;
1405
1406 /*
1407 * We must already hold a ref so there is no race to 0, just
1408 * atomically increment the count.
1409 */
1410 atomic_add_int(&sfm->mref_count, 1);
1411 }
1412
1413 static void
1414 sf_buf_mfree(void *arg)
1415 {
1416 struct sfbuf_mref *sfm = arg;
1417 vm_page_t m;
1418
1419 KKASSERT(sfm->mref_count > 0);
1420 if (atomic_fetchadd_int(&sfm->mref_count, -1) == 1) {
1421 /*
1422 * XXX vm_page_*() and SFBUF routines not MPSAFE yet.
1423 */
1424 get_mplock();
1425 crit_enter();
1426 m = sf_buf_page(sfm->sf);
1427 sf_buf_free(sfm->sf);
1428 vm_page_unwire(m, 0);
1429 if (m->wire_count == 0 && m->object == NULL)
1430 vm_page_try_to_free(m);
1431 crit_exit();
1432 rel_mplock();
1433 kfree(sfm, M_SENDFILE);
1434 }
1435 }
1436
1437 /*
1438 * sendfile(2).
1439 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1440 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1441 *
1442 * Send a file specified by 'fd' and starting at 'offset' to a socket
1443 * specified by 's'. Send only 'nbytes' of the file or until EOF if
1444 * nbytes == 0. Optionally add a header and/or trailer to the socket
1445 * output. If specified, write the total number of bytes sent into *sbytes.
1446 *
1447 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused
1448 * the headers to count against the remaining bytes to be sent from
1449 * the file descriptor. We may wish to implement a compatibility syscall
1450 * in the future.
1451 *
1452 * MPALMOSTSAFE
1453 */
1454 int
1455 sys_sendfile(struct sendfile_args *uap)
1456 {
1457 struct thread *td = curthread;
1458 struct proc *p = td->td_proc;
1459 struct file *fp;
1460 struct vnode *vp = NULL;
1461 struct sf_hdtr hdtr;
1462 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
1463 struct uio auio;
1464 struct mbuf *mheader = NULL;
1465 size_t hbytes = 0;
1466 size_t tbytes;
1467 off_t hdtr_size = 0;
1468 off_t sbytes;
1469 int error;
1470
1471 KKASSERT(p);
1472
1473 /*
1474 * Do argument checking. Must be a regular file in, stream
1475 * type and connected socket out, positive offset.
1476 */
1477 fp = holdfp(p->p_fd, uap->fd, FREAD);
1478 if (fp == NULL) {
1479 return (EBADF);
1480 }
1481 if (fp->f_type != DTYPE_VNODE) {
1482 fdrop(fp);
1483 return (EINVAL);
1484 }
1485 get_mplock();
1486 vp = (struct vnode *)fp->f_data;
1487 vref(vp);
1488 fdrop(fp);
1489
1490 /*
1491 * If specified, get the pointer to the sf_hdtr struct for
1492 * any headers/trailers.
1493 */
1494 if (uap->hdtr) {
1495 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
1496 if (error)
1497 goto done;
1498 /*
1499 * Send any headers.
1500 */
1501 if (hdtr.headers) {
1502 error = iovec_copyin(hdtr.headers, &iov, aiov,
1503 hdtr.hdr_cnt, &hbytes);
1504 if (error)
1505 goto done;
1506 auio.uio_iov = iov;
1507 auio.uio_iovcnt = hdtr.hdr_cnt;
1508 auio.uio_offset = 0;
1509 auio.uio_segflg = UIO_USERSPACE;
1510 auio.uio_rw = UIO_WRITE;
1511 auio.uio_td = td;
1512 auio.uio_resid = hbytes;
1513
1514 mheader = m_uiomove(&auio);
1515
1516 iovec_free(&iov, aiov);
1517 if (mheader == NULL)
1518 goto done;
1519 }
1520 }
1521
1522 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader,
1523 &sbytes, uap->flags);
1524 if (error)
1525 goto done;
1526
1527 /*
1528 * Send trailers. Wimp out and use writev(2).
1529 */
1530 if (uap->hdtr != NULL && hdtr.trailers != NULL) {
1531 error = iovec_copyin(hdtr.trailers, &iov, aiov,
1532 hdtr.trl_cnt, &auio.uio_resid);
1533 if (error)
1534 goto done;
1535 auio.uio_iov = iov;
1536 auio.uio_iovcnt = hdtr.trl_cnt;
1537 auio.uio_offset = 0;
1538 auio.uio_segflg = UIO_USERSPACE;
1539 auio.uio_rw = UIO_WRITE;
1540 auio.uio_td = td;
1541
1542 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes);
1543
1544 iovec_free(&iov, aiov);
1545 if (error)
1546 goto done;
1547 hdtr_size += tbytes; /* trailer bytes successfully sent */
1548 }
1549
1550 done:
1551 if (vp)
1552 vrele(vp);
1553 rel_mplock();
1554 if (uap->sbytes != NULL) {
1555 sbytes += hdtr_size;
1556 copyout(&sbytes, uap->sbytes, sizeof(off_t));
1557 }
1558 return (error);
1559 }
1560
1561 int
1562 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes,
1563 struct mbuf *mheader, off_t *sbytes, int flags)
1564 {
1565 struct thread *td = curthread;
1566 struct proc *p = td->td_proc;
1567 struct vm_object *obj;
1568 struct socket *so;
1569 struct file *fp;
1570 struct mbuf *m;
1571 struct sf_buf *sf;
1572 struct sfbuf_mref *sfm;
1573 struct vm_page *pg;
1574 off_t off, xfsize;
1575 off_t hbytes = 0;
1576 int error = 0;
1577
1578 if (vp->v_type != VREG) {
1579 error = EINVAL;
1580 goto done0;
1581 }
1582 if ((obj = vp->v_object) == NULL) {
1583 error = EINVAL;
1584 goto done0;
1585 }
1586 error = holdsock(p->p_fd, sfd, &fp);
1587 if (error)
1588 goto done0;
1589 so = (struct socket *)fp->f_data;
1590 if (so->so_type != SOCK_STREAM) {
1591 error = EINVAL;
1592 goto done;
1593 }
1594 if ((so->so_state & SS_ISCONNECTED) == 0) {
1595 error = ENOTCONN;
1596 goto done;
1597 }
1598 if (offset < 0) {
1599 error = EINVAL;
1600 goto done;
1601 }
1602
1603 *sbytes = 0;
1604 /*
1605 * Protect against multiple writers to the socket.
1606 */
1607 ssb_lock(&so->so_snd, M_WAITOK);
1608
1609 /*
1610 * Loop through the pages in the file, starting with the requested
1611 * offset. Get a file page (do I/O if necessary), map the file page
1612 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
1613 * it on the socket.
1614 */
1615 for (off = offset; ; off += xfsize, *sbytes += xfsize + hbytes) {
1616 vm_pindex_t pindex;
1617 vm_offset_t pgoff;
1618
1619 pindex = OFF_TO_IDX(off);
1620 retry_lookup:
1621 /*
1622 * Calculate the amount to transfer. Not to exceed a page,
1623 * the EOF, or the passed in nbytes.
1624 */
1625 xfsize = vp->v_filesize - off;
1626 if (xfsize > PAGE_SIZE)
1627 xfsize = PAGE_SIZE;
1628 pgoff = (vm_offset_t)(off & PAGE_MASK);
1629 if (PAGE_SIZE - pgoff < xfsize)
1630 xfsize = PAGE_SIZE - pgoff;
1631 if (nbytes && xfsize > (nbytes - *sbytes))
1632 xfsize = nbytes - *sbytes;
1633 if (xfsize <= 0)
1634 break;
1635 /*
1636 * Optimize the non-blocking case by looking at the socket space
1637 * before going to the extra work of constituting the sf_buf.
1638 */
1639 if ((fp->f_flag & FNONBLOCK) && ssb_space(&so->so_snd) <= 0) {
1640 if (so->so_state & SS_CANTSENDMORE)
1641 error = EPIPE;
1642 else
1643 error = EAGAIN;
1644 ssb_unlock(&so->so_snd);
1645 goto done;
1646 }
1647 /*
1648 * Attempt to look up the page.
1649 *
1650 * Allocate if not found, wait and loop if busy, then
1651 * wire the page. critical section protection is
1652 * required to maintain the object association (an
1653 * interrupt can free the page) through to the
1654 * vm_page_wire() call.
1655 */
1656 crit_enter();
1657 pg = vm_page_lookup(obj, pindex);
1658 if (pg == NULL) {
1659 pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL);
1660 if (pg == NULL) {
1661 vm_wait(0);
1662 crit_exit();
1663 goto retry_lookup;
1664 }
1665 vm_page_wakeup(pg);
1666 } else if (vm_page_sleep_busy(pg, TRUE, "sfpbsy")) {
1667 crit_exit();
1668 goto retry_lookup;
1669 }
1670 vm_page_wire(pg);
1671 crit_exit();
1672
1673 /*
1674 * If page is not valid for what we need, initiate I/O
1675 */
1676
1677 if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) {
1678 struct uio auio;
1679 struct iovec aiov;
1680 int bsize;
1681
1682 /*
1683 * Ensure that our page is still around when the I/O
1684 * completes.
1685 */
1686 vm_page_io_start(pg);
1687
1688 /*
1689 * Get the page from backing store.
1690 */
1691 bsize = vp->v_mount->mnt_stat.f_iosize;
1692 auio.uio_iov = &aiov;
1693 auio.uio_iovcnt = 1;
1694 aiov.iov_base = 0;
1695 aiov.iov_len = MAXBSIZE;
1696 auio.uio_resid = MAXBSIZE;
1697 auio.uio_offset = trunc_page(off);
1698 auio.uio_segflg = UIO_NOCOPY;
1699 auio.uio_rw = UIO_READ;
1700 auio.uio_td = td;
1701 vn_lock(vp, LK_SHARED | LK_RETRY);
1702 error = VOP_READ(vp, &auio,
1703 IO_VMIO | ((MAXBSIZE / bsize) << 16),
1704 td->td_ucred);
1705 vn_unlock(vp);
1706 vm_page_flag_clear(pg, PG_ZERO);
1707 vm_page_io_finish(pg);
1708 if (error) {
1709 crit_enter();
1710 vm_page_unwire(pg, 0);
1711 vm_page_try_to_free(pg);
1712 crit_exit();
1713 ssb_unlock(&so->so_snd);
1714 goto done;
1715 }
1716 }
1717
1718
1719 /*
1720 * Get a sendfile buf. We usually wait as long as necessary,
1721 * but this wait can be interrupted.
1722 */
1723 if ((sf = sf_buf_alloc(pg, SFB_CATCH)) == NULL) {
1724 crit_enter();
1725 vm_page_unwire(pg, 0);
1726 vm_page_try_to_free(pg);
1727 crit_exit();
1728 ssb_unlock(&so->so_snd);
1729 error = EINTR;
1730 goto done;
1731 }
1732
1733 /*
1734 * Get an mbuf header and set it up as having external storage.
1735 */
1736 MGETHDR(m, MB_WAIT, MT_DATA);
1737 if (m == NULL) {
1738 error = ENOBUFS;
1739 sf_buf_free(sf);
1740 ssb_unlock(&so->so_snd);
1741 goto done;
1742 }
1743
1744 /*
1745 * sfm is a temporary hack, use a per-cpu cache for this.
1746 */
1747 sfm = kmalloc(sizeof(struct sfbuf_mref), M_SENDFILE, M_WAITOK);
1748 sfm->sf = sf;
1749 sfm->mref_count = 1;
1750
1751 m->m_ext.ext_free = sf_buf_mfree;
1752 m->m_ext.ext_ref = sf_buf_mref;
1753 m->m_ext.ext_arg = sfm;
1754 m->m_ext.ext_buf = (void *)sf->kva;
1755 m->m_ext.ext_size = PAGE_SIZE;
1756 m->m_data = (char *) sf->kva + pgoff;
1757 m->m_flags |= M_EXT;
1758 m->m_pkthdr.len = m->m_len = xfsize;
1759 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0);
1760
1761 if (mheader != NULL) {
1762 hbytes = mheader->m_pkthdr.len;
1763 mheader->m_pkthdr.len += m->m_pkthdr.len;
1764 m_cat(mheader, m);
1765 m = mheader;
1766 mheader = NULL;
1767 } else
1768 hbytes = 0;
1769
1770 /*
1771 * Add the buffer to the socket buffer chain.
1772 */
1773 crit_enter();
1774 retry_space:
1775 /*
1776 * Make sure that the socket is still able to take more data.
1777 * CANTSENDMORE being true usually means that the connection
1778 * was closed. so_error is true when an error was sensed after
1779 * a previous send.
1780 * The state is checked after the page mapping and buffer
1781 * allocation above since those operations may block and make
1782 * any socket checks stale. From this point forward, nothing
1783 * blocks before the pru_send (or more accurately, any blocking
1784 * results in a loop back to here to re-check).
1785 */
1786 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) {
1787 if (so->so_state & SS_CANTSENDMORE) {
1788 error = EPIPE;
1789 } else {
1790 error = so->so_error;
1791 so->so_error = 0;
1792 }
1793 m_freem(m);
1794 ssb_unlock(&so->so_snd);
1795 crit_exit();
1796 goto done;
1797 }
1798 /*
1799 * Wait for socket space to become available. We do this just
1800 * after checking the connection state above in order to avoid
1801 * a race condition with ssb_wait().
1802 */
1803 if (ssb_space(&so->so_snd) < so->so_snd.ssb_lowat) {
1804 if (fp->f_flag & FNONBLOCK) {
1805 m_freem(m);
1806 ssb_unlock(&so->so_snd);
1807 crit_exit();
1808 error = EAGAIN;
1809 goto done;
1810 }
1811 error = ssb_wait(&so->so_snd);
1812 /*
1813 * An error from ssb_wait usually indicates that we've
1814 * been interrupted by a signal. If we've sent anything
1815 * then return bytes sent, otherwise return the error.
1816 */
1817 if (error) {
1818 m_freem(m);
1819 ssb_unlock(&so->so_snd);
1820 crit_exit();
1821 goto done;
1822 }
1823 goto retry_space;
1824 }
1825 error = so_pru_send(so, 0, m, NULL, NULL, td);
1826 crit_exit();
1827 if (error) {
1828 ssb_unlock(&so->so_snd);
1829 goto done;
1830 }
1831 }
1832 if (mheader != NULL) {
1833 *sbytes += mheader->m_pkthdr.len;
1834 error = so_pru_send(so, 0, mheader, NULL, NULL, td);
1835 mheader = NULL;
1836 }
1837 ssb_unlock(&so->so_snd);
1838
1839 done:
1840 fdrop(fp);
1841 done0:
1842 if (mheader != NULL)
1843 m_freem(mheader);
1844 return (error);
1845 }
1846
1847 /*
1848 * MPALMOSTSAFE
1849 */
1850 int
1851 sys_sctp_peeloff(struct sctp_peeloff_args *uap)
1852 {
1853 #ifdef SCTP
1854 struct thread *td = curthread;
1855 struct filedesc *fdp = td->td_proc->p_fd;
1856 struct file *lfp = NULL;
1857 struct file *nfp = NULL;
1858 int error;
1859 struct socket *head, *so;
1860 caddr_t assoc_id;
1861 int fd;
1862 short fflag; /* type must match fp->f_flag */
1863
1864 assoc_id = uap->name;
1865 error = holdsock(td->td_proc->p_fd, uap->sd, &lfp);
1866 if (error)
1867 return (error);
1868
1869 get_mplock();
1870 crit_enter();
1871 head = (struct socket *)lfp->f_data;
1872 error = sctp_can_peel_off(head, assoc_id);
1873 if (error) {
1874 crit_exit();
1875 goto done;
1876 }
1877 /*
1878 * At this point we know we do have a assoc to pull
1879 * we proceed to get the fd setup. This may block
1880 * but that is ok.
1881 */
1882
1883 fflag = lfp->f_flag;
1884 error = falloc(td->td_lwp, &nfp, &fd);
1885 if (error) {
1886 /*
1887 * Probably ran out of file descriptors. Put the
1888 * unaccepted connection back onto the queue and
1889 * do another wakeup so some other process might
1890 * have a chance at it.
1891 */
1892 crit_exit();
1893 goto done;
1894 }
1895 uap->sysmsg_iresult = fd;
1896
1897 so = sctp_get_peeloff(head, assoc_id, &error);
1898 if (so == NULL) {
1899 /*
1900 * Either someone else peeled it off OR
1901 * we can't get a socket.
1902 */
1903 goto noconnection;
1904 }
1905 so->so_state &= ~SS_COMP;
1906 so->so_state &= ~SS_NOFDREF;
1907 so->so_head = NULL;
1908 if (head->so_sigio != NULL)
1909 fsetown(fgetown(head->so_sigio), &so->so_sigio);
1910
1911 nfp->f_type = DTYPE_SOCKET;
1912 nfp->f_flag = fflag;
1913 nfp->f_ops = &socketops;
1914 nfp->f_data = so;
1915
1916 noconnection:
1917 /*
1918 * Assign the file pointer to the reserved descriptor, or clear
1919 * the reserved descriptor if an error occured.
1920 */
1921 if (error)
1922 fsetfd(fdp, NULL, fd);
1923 else
1924 fsetfd(fdp, nfp, fd);
1925 crit_exit();
1926 /*
1927 * Release explicitly held references before returning.
1928 */
1929 done:
1930 rel_mplock();
1931 if (nfp != NULL)
1932 fdrop(nfp);
1933 fdrop(lfp);
1934 return (error);
1935 #else /* SCTP */
1936 return(EOPNOTSUPP);
1937 #endif /* SCTP */
1938 }
DragonFly BSD