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. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
33 * $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.65.2.17 2003/04/04 17:11:16 tegge Exp $
34 */
35
36 #include "opt_ktrace.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/sysmsg.h>
42 #include <sys/malloc.h>
43 #include <sys/filedesc.h>
44 #include <sys/event.h>
45 #include <sys/proc.h>
46 #include <sys/fcntl.h>
47 #include <sys/file.h>
48 #include <sys/filio.h>
49 #include <sys/kern_syscall.h>
50 #include <sys/mbuf.h>
51 #include <sys/protosw.h>
52 #include <sys/sfbuf.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/socketops.h>
56 #include <sys/uio.h>
57 #include <sys/vnode.h>
58 #include <sys/lock.h>
59 #include <sys/mount.h>
60 #include <sys/jail.h>
61 #ifdef KTRACE
62 #include <sys/ktrace.h>
63 #endif
64 #include <vm/vm.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_page.h>
67 #include <vm/vm_pageout.h>
68 #include <vm/vm_kern.h>
69 #include <vm/vm_extern.h>
70 #include <sys/file2.h>
71 #include <sys/signalvar.h>
72 #include <sys/serialize.h>
73
74 #include <sys/thread2.h>
75 #include <sys/msgport2.h>
76 #include <sys/socketvar2.h>
77 #include <net/netmsg2.h>
78 #include <vm/vm_page2.h>
79
80 extern int use_soaccept_pred_fast;
81 extern int use_sendfile_async;
82 extern int use_soconnect_async;
83
84 /*
85 * System call interface to the socket abstraction.
86 */
87
88 extern struct fileops socketops;
89
90 /*
91 * socket_args(int domain, int type, int protocol)
92 */
93 int
kern_socket(int domain,int type,int protocol,int * res)94 kern_socket(int domain, int type, int protocol, int *res)
95 {
96 struct thread *td = curthread;
97 struct filedesc *fdp = td->td_proc->p_fd;
98 struct socket *so;
99 struct file *fp;
100 int fd, error;
101 u_int fflags = 0;
102 int oflags = 0;
103
104 KKASSERT(td->td_lwp);
105
106 if (type & SOCK_NONBLOCK) {
107 type &= ~SOCK_NONBLOCK;
108 fflags |= FNONBLOCK;
109 }
110 if (type & SOCK_CLOEXEC) {
111 type &= ~SOCK_CLOEXEC;
112 oflags |= O_CLOEXEC;
113 }
114
115 error = falloc(td->td_lwp, &fp, &fd);
116 if (error)
117 return (error);
118 error = socreate(domain, &so, type, protocol, td);
119 if (error) {
120 fsetfd(fdp, NULL, fd);
121 } else {
122 fp->f_type = DTYPE_SOCKET;
123 fp->f_flag = FREAD | FWRITE | fflags;
124 fp->f_ops = &socketops;
125 fp->f_data = so;
126 if (oflags & O_CLOEXEC)
127 fdp->fd_files[fd].fileflags |= UF_EXCLOSE;
128 *res = fd;
129 fsetfd(fdp, fp, fd);
130 }
131 fdrop(fp);
132 return (error);
133 }
134
135 /*
136 * MPALMOSTSAFE
137 */
138 int
sys_socket(struct sysmsg * sysmsg,const struct socket_args * uap)139 sys_socket(struct sysmsg *sysmsg, const struct socket_args *uap)
140 {
141 int error;
142
143 error = kern_socket(uap->domain, uap->type, uap->protocol,
144 &sysmsg->sysmsg_iresult);
145
146 return (error);
147 }
148
149 int
kern_bind(int s,struct sockaddr * sa)150 kern_bind(int s, struct sockaddr *sa)
151 {
152 struct thread *td = curthread;
153 struct file *fp;
154 int error;
155
156 error = holdsock(td, s, &fp);
157 if (error)
158 return (error);
159 error = sobind((struct socket *)fp->f_data, sa, td);
160 dropfp(td, s, fp);
161
162 return (error);
163 }
164
165 /*
166 * bind_args(int s, caddr_t name, int namelen)
167 *
168 * MPALMOSTSAFE
169 */
170 int
sys_bind(struct sysmsg * sysmsg,const struct bind_args * uap)171 sys_bind(struct sysmsg *sysmsg, const struct bind_args *uap)
172 {
173 struct sockaddr *sa;
174 int error;
175
176 error = getsockaddr(&sa, uap->name, uap->namelen);
177 if (error)
178 return (error);
179 if (!prison_remote_ip(curthread, sa)) {
180 kfree(sa, M_SONAME);
181 return EAFNOSUPPORT;
182 }
183 error = kern_bind(uap->s, sa);
184 kfree(sa, M_SONAME);
185
186 return (error);
187 }
188
189 int
kern_listen(int s,int backlog)190 kern_listen(int s, int backlog)
191 {
192 struct thread *td = curthread;
193 struct file *fp;
194 int error;
195
196 error = holdsock(td, s, &fp);
197 if (error)
198 return (error);
199 error = solisten((struct socket *)fp->f_data, backlog, td);
200 dropfp(td, s, fp);
201
202 return (error);
203 }
204
205 /*
206 * listen_args(int s, int backlog)
207 *
208 * MPALMOSTSAFE
209 */
210 int
sys_listen(struct sysmsg * sysmsg,const struct listen_args * uap)211 sys_listen(struct sysmsg *sysmsg, const struct listen_args *uap)
212 {
213 int error;
214
215 error = kern_listen(uap->s, uap->backlog);
216 return (error);
217 }
218
219 /*
220 * Returns the accepted socket as well.
221 *
222 * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the
223 * pool token is absolutely required to avoid a sofree() race,
224 * as well as to avoid tailq handling races.
225 */
226 static boolean_t
soaccept_predicate(struct netmsg_so_notify * msg)227 soaccept_predicate(struct netmsg_so_notify *msg)
228 {
229 struct socket *head = msg->base.nm_so;
230 struct socket *so;
231
232 if (head->so_error != 0) {
233 msg->base.lmsg.ms_error = head->so_error;
234 return (TRUE);
235 }
236 lwkt_getpooltoken(head);
237 if (!TAILQ_EMPTY(&head->so_comp)) {
238 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */
239 so = TAILQ_FIRST(&head->so_comp);
240 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == SS_COMP);
241 TAILQ_REMOVE(&head->so_comp, so, so_list);
242 head->so_qlen--;
243 soclrstate(so, SS_COMP);
244
245 /*
246 * Keep a reference before clearing the so_head
247 * to avoid racing socket close in netisr.
248 */
249 soreference(so);
250 so->so_head = NULL;
251
252 lwkt_relpooltoken(head);
253
254 msg->base.lmsg.ms_error = 0;
255 msg->base.nm_so = so;
256 return (TRUE);
257 }
258 lwkt_relpooltoken(head);
259 if (head->so_state & SS_CANTRCVMORE) {
260 msg->base.lmsg.ms_error = ECONNABORTED;
261 return (TRUE);
262 }
263 if (msg->nm_fflags & FNONBLOCK) {
264 msg->base.lmsg.ms_error = EWOULDBLOCK;
265 return (TRUE);
266 }
267
268 return (FALSE);
269 }
270
271 /*
272 * The second argument to kern_accept() is a handle to a struct sockaddr.
273 * This allows kern_accept() to return a pointer to an allocated struct
274 * sockaddr which must be freed later with FREE(). The caller must
275 * initialize *name to NULL.
276 */
277 int
kern_accept(int s,int fflags,struct sockaddr ** name,int * namelen,int * res,int sockflags)278 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res,
279 int sockflags)
280 {
281 struct thread *td = curthread;
282 struct filedesc *fdp = td->td_proc->p_fd;
283 struct file *lfp = NULL;
284 struct file *nfp = NULL;
285 struct sockaddr *sa;
286 struct socket *head, *so;
287 struct netmsg_so_notify msg;
288 int fd;
289 u_int fflag; /* type must match fp->f_flag */
290 int error, tmp;
291
292 *res = -1;
293 if (name && namelen && *namelen < 0)
294 return (EINVAL);
295
296 error = holdsock(td, s, &lfp);
297 if (error)
298 return (error);
299
300 error = falloc(td->td_lwp, &nfp, &fd);
301 if (error) { /* Probably ran out of file descriptors. */
302 fdrop(lfp);
303 return (error);
304 }
305 head = (struct socket *)lfp->f_data;
306 if ((head->so_options & SO_ACCEPTCONN) == 0) {
307 error = EINVAL;
308 goto done;
309 }
310
311 if (fflags & O_FBLOCKING)
312 fflags |= lfp->f_flag & ~FNONBLOCK;
313 else if (fflags & O_FNONBLOCKING)
314 fflags |= lfp->f_flag | FNONBLOCK;
315 else
316 fflags = lfp->f_flag;
317
318 if (use_soaccept_pred_fast) {
319 boolean_t pred;
320
321 /* Initialize necessary parts for soaccept_predicate() */
322 netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL);
323 msg.nm_fflags = fflags;
324
325 lwkt_getpooltoken(head);
326 pred = soaccept_predicate(&msg);
327 lwkt_relpooltoken(head);
328
329 if (pred) {
330 error = msg.base.lmsg.ms_error;
331 if (error)
332 goto done;
333 else
334 goto accepted;
335 }
336 }
337
338 /* optimize for uniprocessor case later XXX JH */
339 netmsg_init_abortable(&msg.base, head, &curthread->td_msgport,
340 0, netmsg_so_notify, netmsg_so_notify_doabort);
341 msg.nm_predicate = soaccept_predicate;
342 msg.nm_fflags = fflags;
343 msg.nm_etype = NM_REVENT;
344 error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH);
345 if (error)
346 goto done;
347
348 accepted:
349 /*
350 * At this point we have the connection that's ready to be accepted.
351 *
352 * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects
353 * to eat the ref and turn it into a descriptor.
354 */
355 so = msg.base.nm_so;
356
357 fflag = lfp->f_flag;
358
359 /* connection has been removed from the listen queue */
360 KNOTE(&head->so_rcv.ssb_kq.ki_note, 0);
361
362 if (sockflags & SOCK_KERN_NOINHERIT) {
363 fflag &= ~(FASYNC | FNONBLOCK);
364 if (sockflags & SOCK_NONBLOCK)
365 fflag |= FNONBLOCK;
366 } else {
367 if (head->so_sigio != NULL)
368 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
369 }
370
371 nfp->f_type = DTYPE_SOCKET;
372 nfp->f_flag = fflag;
373 nfp->f_ops = &socketops;
374 nfp->f_data = so;
375 /* Sync socket async state with file flags */
376 tmp = fflag & FASYNC;
377 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL);
378
379 sa = NULL;
380 if (so->so_faddr != NULL) {
381 sa = so->so_faddr;
382 so->so_faddr = NULL;
383
384 soaccept_generic(so);
385 error = 0;
386 } else {
387 error = soaccept(so, &sa);
388 }
389
390 /*
391 * Set the returned name and namelen as applicable. Set the returned
392 * namelen to 0 for older code which might ignore the return value
393 * from accept.
394 */
395 if (error == 0) {
396 if (sa && name && namelen) {
397 if (*namelen > sa->sa_len)
398 *namelen = sa->sa_len;
399 *name = sa;
400 } else {
401 if (sa)
402 kfree(sa, M_SONAME);
403 }
404 }
405
406 done:
407 /*
408 * If an error occured clear the reserved descriptor, else associate
409 * nfp with it.
410 *
411 * Note that *res is normally ignored if an error is returned but
412 * a syscall message will still have access to the result code.
413 */
414 if (error) {
415 fsetfd(fdp, NULL, fd);
416 } else {
417 if (sockflags & SOCK_CLOEXEC)
418 fdp->fd_files[fd].fileflags |= UF_EXCLOSE;
419 *res = fd;
420 fsetfd(fdp, nfp, fd);
421 }
422 fdrop(nfp);
423 dropfp(td, s, lfp);
424
425 return (error);
426 }
427
428 /*
429 * accept(int s, caddr_t name, int *anamelen)
430 *
431 * MPALMOSTSAFE
432 */
433 int
sys_accept(struct sysmsg * sysmsg,const struct accept_args * uap)434 sys_accept(struct sysmsg *sysmsg, const struct accept_args *uap)
435 {
436 struct sockaddr *sa = NULL;
437 int sa_len;
438 int error;
439
440 if (uap->name) {
441 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len));
442 if (error)
443 return (error);
444
445 error = kern_accept(uap->s, 0, &sa, &sa_len,
446 &sysmsg->sysmsg_iresult, 0);
447
448 if (error == 0) {
449 prison_local_ip(curthread, sa);
450 error = copyout(sa, uap->name, sa_len);
451 }
452 if (error == 0) {
453 error = copyout(&sa_len, uap->anamelen,
454 sizeof(*uap->anamelen));
455 }
456 if (sa)
457 kfree(sa, M_SONAME);
458 } else {
459 error = kern_accept(uap->s, 0, NULL, 0,
460 &sysmsg->sysmsg_iresult, 0);
461 }
462 return (error);
463 }
464
465 /*
466 * extaccept(int s, int fflags, caddr_t name, int *anamelen)
467 *
468 * MPALMOSTSAFE
469 */
470 int
sys_extaccept(struct sysmsg * sysmsg,const struct extaccept_args * uap)471 sys_extaccept(struct sysmsg *sysmsg, const struct extaccept_args *uap)
472 {
473 struct sockaddr *sa = NULL;
474 int sa_len;
475 int error;
476 int fflags = uap->flags & O_FMASK;
477
478 if (uap->name) {
479 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len));
480 if (error)
481 return (error);
482
483 error = kern_accept(uap->s, fflags, &sa, &sa_len,
484 &sysmsg->sysmsg_iresult, 0);
485
486 if (error == 0) {
487 prison_local_ip(curthread, sa);
488 error = copyout(sa, uap->name, sa_len);
489 }
490 if (error == 0) {
491 error = copyout(&sa_len, uap->anamelen,
492 sizeof(*uap->anamelen));
493 }
494 if (sa)
495 kfree(sa, M_SONAME);
496 } else {
497 error = kern_accept(uap->s, fflags, NULL, 0,
498 &sysmsg->sysmsg_iresult, 0);
499 }
500 return (error);
501 }
502
503 /*
504 * accept4(int s, caddr_t name, int *anamelen, int flags)
505 *
506 * MPALMOSTSAFE
507 */
508 int
sys_accept4(struct sysmsg * sysmsg,const struct accept4_args * uap)509 sys_accept4(struct sysmsg *sysmsg, const struct accept4_args *uap)
510 {
511 struct sockaddr *sa = NULL;
512 int sa_len;
513 int error;
514 int sockflags;
515
516 if (uap->flags & ~(SOCK_NONBLOCK | SOCK_CLOEXEC))
517 return (EINVAL);
518 sockflags = uap->flags | SOCK_KERN_NOINHERIT;
519
520 if (uap->name) {
521 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len));
522 if (error)
523 return (error);
524
525 error = kern_accept(uap->s, 0, &sa, &sa_len,
526 &sysmsg->sysmsg_iresult, sockflags);
527
528 if (error == 0) {
529 prison_local_ip(curthread, sa);
530 error = copyout(sa, uap->name, sa_len);
531 }
532 if (error == 0) {
533 error = copyout(&sa_len, uap->anamelen,
534 sizeof(*uap->anamelen));
535 }
536 if (sa)
537 kfree(sa, M_SONAME);
538 } else {
539 error = kern_accept(uap->s, 0, NULL, 0,
540 &sysmsg->sysmsg_iresult, sockflags);
541 }
542 return (error);
543 }
544
545 /*
546 * Returns TRUE if predicate satisfied.
547 */
548 static boolean_t
soconnected_predicate(struct netmsg_so_notify * msg)549 soconnected_predicate(struct netmsg_so_notify *msg)
550 {
551 struct socket *so = msg->base.nm_so;
552
553 /* check predicate */
554 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) {
555 msg->base.lmsg.ms_error = so->so_error;
556 return (TRUE);
557 }
558
559 return (FALSE);
560 }
561
562 int
kern_connect(int s,int fflags,struct sockaddr * sa)563 kern_connect(int s, int fflags, struct sockaddr *sa)
564 {
565 struct thread *td = curthread;
566 struct file *fp;
567 struct socket *so;
568 int error, interrupted = 0;
569
570 error = holdsock(td, s, &fp);
571 if (error)
572 return (error);
573 so = (struct socket *)fp->f_data;
574
575 if (fflags & O_FBLOCKING)
576 /* fflags &= ~FNONBLOCK; */;
577 else if (fflags & O_FNONBLOCKING)
578 fflags |= FNONBLOCK;
579 else
580 fflags = fp->f_flag;
581
582 if (so->so_state & SS_ISCONNECTING) {
583 error = EALREADY;
584 goto done;
585 }
586 error = soconnect(so, sa, td, use_soconnect_async ? FALSE : TRUE);
587 if (error)
588 goto bad;
589 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) {
590 error = EINPROGRESS;
591 goto done;
592 }
593 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
594 struct netmsg_so_notify msg;
595
596 netmsg_init_abortable(&msg.base, so,
597 &curthread->td_msgport,
598 0,
599 netmsg_so_notify,
600 netmsg_so_notify_doabort);
601 msg.nm_predicate = soconnected_predicate;
602 msg.nm_etype = NM_REVENT;
603 error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH);
604 if (error == EINTR || error == ERESTART)
605 interrupted = 1;
606 }
607 if (error == 0) {
608 error = so->so_error;
609 so->so_error = 0;
610 }
611 bad:
612 if (!interrupted)
613 soclrstate(so, SS_ISCONNECTING);
614 if (error == ERESTART)
615 error = EINTR;
616 done:
617 dropfp(td, s, fp);
618
619 return (error);
620 }
621
622 /*
623 * connect_args(int s, caddr_t name, int namelen)
624 *
625 * MPALMOSTSAFE
626 */
627 int
sys_connect(struct sysmsg * sysmsg,const struct connect_args * uap)628 sys_connect(struct sysmsg *sysmsg, const struct connect_args *uap)
629 {
630 struct sockaddr *sa;
631 int error;
632
633 error = getsockaddr(&sa, uap->name, uap->namelen);
634 if (error)
635 return (error);
636 if (!prison_remote_ip(curthread, sa)) {
637 kfree(sa, M_SONAME);
638 return EAFNOSUPPORT;
639 }
640 error = kern_connect(uap->s, 0, sa);
641 kfree(sa, M_SONAME);
642
643 return (error);
644 }
645
646 /*
647 * connect_args(int s, int fflags, caddr_t name, int namelen)
648 *
649 * MPALMOSTSAFE
650 */
651 int
sys_extconnect(struct sysmsg * sysmsg,const struct extconnect_args * uap)652 sys_extconnect(struct sysmsg *sysmsg, const struct extconnect_args *uap)
653 {
654 struct sockaddr *sa;
655 int error;
656 int fflags = uap->flags & O_FMASK;
657
658 error = getsockaddr(&sa, uap->name, uap->namelen);
659 if (error)
660 return (error);
661 if (!prison_remote_ip(curthread, sa)) {
662 kfree(sa, M_SONAME);
663 return EAFNOSUPPORT;
664 }
665 error = kern_connect(uap->s, fflags, sa);
666 kfree(sa, M_SONAME);
667
668 return (error);
669 }
670
671 int
kern_socketpair(int domain,int type,int protocol,int * sv)672 kern_socketpair(int domain, int type, int protocol, int *sv)
673 {
674 struct thread *td = curthread;
675 struct filedesc *fdp;
676 struct file *fp1, *fp2;
677 struct socket *so1, *so2;
678 struct ucred *cred = curthread->td_ucred;
679 int fd1, fd2, error;
680 u_int fflags = 0;
681 int oflags = 0;
682
683 if (type & SOCK_NONBLOCK) {
684 type &= ~SOCK_NONBLOCK;
685 fflags |= FNONBLOCK;
686 }
687 if (type & SOCK_CLOEXEC) {
688 type &= ~SOCK_CLOEXEC;
689 oflags |= O_CLOEXEC;
690 }
691
692 fdp = td->td_proc->p_fd;
693 error = socreate(domain, &so1, type, protocol, td);
694 if (error)
695 return (error);
696 error = socreate(domain, &so2, type, protocol, td);
697 if (error)
698 goto free1;
699 error = falloc(td->td_lwp, &fp1, &fd1);
700 if (error)
701 goto free2;
702 sv[0] = fd1;
703 fp1->f_data = so1;
704 error = falloc(td->td_lwp, &fp2, &fd2);
705 if (error)
706 goto free3;
707 fp2->f_data = so2;
708 sv[1] = fd2;
709 error = soconnect2(so1, so2, cred);
710 if (error)
711 goto free4;
712 if (type == SOCK_DGRAM) {
713 /*
714 * Datagram socket connection is asymmetric.
715 */
716 error = soconnect2(so2, so1, cred);
717 if (error)
718 goto free4;
719 }
720 fp1->f_type = fp2->f_type = DTYPE_SOCKET;
721 fp1->f_flag = fp2->f_flag = FREAD|FWRITE|fflags;
722 fp1->f_ops = fp2->f_ops = &socketops;
723 if (oflags & O_CLOEXEC) {
724 fdp->fd_files[fd1].fileflags |= UF_EXCLOSE;
725 fdp->fd_files[fd2].fileflags |= UF_EXCLOSE;
726 }
727 fsetfd(fdp, fp1, fd1);
728 fsetfd(fdp, fp2, fd2);
729 fdrop(fp1);
730 fdrop(fp2);
731 return (error);
732 free4:
733 fsetfd(fdp, NULL, fd2);
734 fdrop(fp2);
735 free3:
736 fsetfd(fdp, NULL, fd1);
737 fdrop(fp1);
738 free2:
739 (void)soclose(so2, 0);
740 free1:
741 (void)soclose(so1, 0);
742 return (error);
743 }
744
745 /*
746 * socketpair(int domain, int type, int protocol, int *rsv)
747 */
748 int
sys_socketpair(struct sysmsg * sysmsg,const struct socketpair_args * uap)749 sys_socketpair(struct sysmsg *sysmsg, const struct socketpair_args *uap)
750 {
751 int error, sockv[2];
752
753 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv);
754
755 if (error == 0) {
756 error = copyout(sockv, uap->rsv, sizeof(sockv));
757
758 if (error != 0) {
759 kern_close(sockv[0]);
760 kern_close(sockv[1]);
761 }
762 }
763
764 return (error);
765 }
766
767 int
kern_sendmsg(int s,struct sockaddr * sa,struct uio * auio,struct mbuf * control,int flags,size_t * res)768 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio,
769 struct mbuf *control, int flags, size_t *res)
770 {
771 struct thread *td = curthread;
772 struct lwp *lp = td->td_lwp;
773 struct proc *p = td->td_proc;
774 struct file *fp;
775 size_t len;
776 int error;
777 struct socket *so;
778 #ifdef KTRACE
779 struct iovec *ktriov = NULL;
780 struct uio ktruio;
781 #endif
782
783 error = holdsock(td, s, &fp);
784 if (error)
785 return (error);
786 #ifdef KTRACE
787 if (KTRPOINT(td, KTR_GENIO)) {
788 int iovlen = auio->uio_iovcnt * sizeof (struct iovec);
789
790 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
791 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
792 ktruio = *auio;
793 }
794 #endif
795 len = auio->uio_resid;
796 so = (struct socket *)fp->f_data;
797 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) {
798 if (fp->f_flag & FNONBLOCK)
799 flags |= MSG_FNONBLOCKING;
800 }
801 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td);
802 if (error) {
803 if (auio->uio_resid != len && (error == ERESTART ||
804 error == EINTR || error == EWOULDBLOCK))
805 error = 0;
806 if (error == EPIPE && !(flags & MSG_NOSIGNAL) &&
807 !(so->so_options & SO_NOSIGPIPE))
808 lwpsignal(p, lp, SIGPIPE);
809 }
810 #ifdef KTRACE
811 if (ktriov != NULL) {
812 if (error == 0) {
813 ktruio.uio_iov = ktriov;
814 ktruio.uio_resid = len - auio->uio_resid;
815 ktrgenio(lp, s, UIO_WRITE, &ktruio, error);
816 }
817 kfree(ktriov, M_TEMP);
818 }
819 #endif
820 if (error == 0)
821 *res = len - auio->uio_resid;
822 dropfp(td, s, fp);
823
824 return (error);
825 }
826
827 /*
828 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen)
829 *
830 * MPALMOSTSAFE
831 */
832 int
sys_sendto(struct sysmsg * sysmsg,const struct sendto_args * uap)833 sys_sendto(struct sysmsg *sysmsg, const struct sendto_args *uap)
834 {
835 struct thread *td = curthread;
836 struct uio auio;
837 struct iovec aiov;
838 struct sockaddr *sa = NULL;
839 int error;
840
841 if (uap->to) {
842 error = getsockaddr(&sa, uap->to, uap->tolen);
843 if (error)
844 return (error);
845 if (!prison_remote_ip(curthread, sa)) {
846 kfree(sa, M_SONAME);
847 return EAFNOSUPPORT;
848 }
849 }
850 aiov.iov_base = uap->buf;
851 aiov.iov_len = uap->len;
852 auio.uio_iov = &aiov;
853 auio.uio_iovcnt = 1;
854 auio.uio_offset = 0;
855 auio.uio_resid = uap->len;
856 auio.uio_segflg = UIO_USERSPACE;
857 auio.uio_rw = UIO_WRITE;
858 auio.uio_td = td;
859
860 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags,
861 &sysmsg->sysmsg_szresult);
862
863 if (sa)
864 kfree(sa, M_SONAME);
865 return (error);
866 }
867
868 /*
869 * sendmsg_args(int s, caddr_t msg, int flags)
870 *
871 * MPALMOSTSAFE
872 */
873 int
sys_sendmsg(struct sysmsg * sysmsg,const struct sendmsg_args * uap)874 sys_sendmsg(struct sysmsg *sysmsg, const struct sendmsg_args *uap)
875 {
876 struct thread *td = curthread;
877 struct msghdr msg;
878 struct uio auio;
879 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
880 struct sockaddr *sa = NULL;
881 struct mbuf *control = NULL;
882 int error;
883
884 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg));
885 if (error)
886 return (error);
887
888 /*
889 * Conditionally copyin msg.msg_name.
890 */
891 if (msg.msg_name) {
892 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen);
893 if (error)
894 return (error);
895 if (!prison_remote_ip(curthread, sa)) {
896 kfree(sa, M_SONAME);
897 return EAFNOSUPPORT;
898 }
899 }
900
901 /*
902 * Populate auio.
903 */
904 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen,
905 &auio.uio_resid);
906 if (error)
907 goto cleanup2;
908 auio.uio_iov = iov;
909 auio.uio_iovcnt = msg.msg_iovlen;
910 auio.uio_offset = 0;
911 auio.uio_segflg = UIO_USERSPACE;
912 auio.uio_rw = UIO_WRITE;
913 auio.uio_td = td;
914
915 /*
916 * Conditionally copyin msg.msg_control.
917 */
918 if (msg.msg_control) {
919 if (msg.msg_controllen < sizeof(struct cmsghdr) ||
920 msg.msg_controllen > MLEN) {
921 error = EINVAL;
922 goto cleanup;
923 }
924 control = m_get(M_WAITOK, MT_CONTROL);
925 control->m_len = msg.msg_controllen;
926 error = copyin(msg.msg_control, mtod(control, caddr_t),
927 msg.msg_controllen);
928 if (error) {
929 m_free(control);
930 goto cleanup;
931 }
932 }
933
934 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags,
935 &sysmsg->sysmsg_szresult);
936
937 cleanup:
938 iovec_free(&iov, aiov);
939 cleanup2:
940 if (sa)
941 kfree(sa, M_SONAME);
942 return (error);
943 }
944
945 /*
946 * kern_recvmsg() takes a handle to sa and control. If the handle is non-
947 * null, it returns a dynamically allocated struct sockaddr and an mbuf.
948 * Don't forget to FREE() and m_free() these if they are returned.
949 */
950 int
kern_recvmsg(int s,struct sockaddr ** sa,struct uio * auio,struct mbuf ** control,int * flags,size_t * res)951 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio,
952 struct mbuf **control, int *flags, size_t *res)
953 {
954 struct thread *td = curthread;
955 struct file *fp;
956 size_t len;
957 int error;
958 int lflags;
959 struct socket *so;
960 #ifdef KTRACE
961 struct iovec *ktriov = NULL;
962 struct uio ktruio;
963 #endif
964
965 error = holdsock(td, s, &fp);
966 if (error)
967 return (error);
968 #ifdef KTRACE
969 if (KTRPOINT(td, KTR_GENIO)) {
970 int iovlen = auio->uio_iovcnt * sizeof (struct iovec);
971
972 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
973 bcopy(auio->uio_iov, ktriov, iovlen);
974 ktruio = *auio;
975 }
976 #endif
977 len = auio->uio_resid;
978 so = (struct socket *)fp->f_data;
979
980 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) {
981 if (fp->f_flag & FNONBLOCK) {
982 if (flags) {
983 *flags |= MSG_FNONBLOCKING;
984 } else {
985 lflags = MSG_FNONBLOCKING;
986 flags = &lflags;
987 }
988 }
989 }
990
991 error = so_pru_soreceive(so, sa, auio, NULL, control, flags);
992 if (error) {
993 if (auio->uio_resid != len && (error == ERESTART ||
994 error == EINTR || error == EWOULDBLOCK))
995 error = 0;
996 }
997 #ifdef KTRACE
998 if (ktriov != NULL) {
999 if (error == 0) {
1000 ktruio.uio_iov = ktriov;
1001 ktruio.uio_resid = len - auio->uio_resid;
1002 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error);
1003 }
1004 kfree(ktriov, M_TEMP);
1005 }
1006 #endif
1007 if (error == 0)
1008 *res = len - auio->uio_resid;
1009 dropfp(td, s, fp);
1010
1011 return (error);
1012 }
1013
1014 /*
1015 * recvfrom_args(int s, caddr_t buf, size_t len, int flags,
1016 * caddr_t from, int *fromlenaddr)
1017 *
1018 * MPALMOSTSAFE
1019 */
1020 int
sys_recvfrom(struct sysmsg * sysmsg,const struct recvfrom_args * uap)1021 sys_recvfrom(struct sysmsg *sysmsg, const struct recvfrom_args *uap)
1022 {
1023 struct thread *td = curthread;
1024 struct uio auio;
1025 struct iovec aiov;
1026 struct sockaddr *sa = NULL;
1027 int error, fromlen;
1028 int flags;
1029
1030 if (uap->from && uap->fromlenaddr) {
1031 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen));
1032 if (error)
1033 return (error);
1034 if (fromlen < 0)
1035 return (EINVAL);
1036 } else {
1037 fromlen = 0;
1038 }
1039 aiov.iov_base = uap->buf;
1040 aiov.iov_len = uap->len;
1041 auio.uio_iov = &aiov;
1042 auio.uio_iovcnt = 1;
1043 auio.uio_offset = 0;
1044 auio.uio_resid = uap->len;
1045 auio.uio_segflg = UIO_USERSPACE;
1046 auio.uio_rw = UIO_READ;
1047 auio.uio_td = td;
1048 flags = uap->flags;
1049
1050 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL,
1051 &flags, &sysmsg->sysmsg_szresult);
1052
1053 if (error == 0 && uap->from) {
1054 /* note: sa may still be NULL */
1055 if (sa) {
1056 fromlen = MIN(fromlen, sa->sa_len);
1057 prison_local_ip(curthread, sa);
1058 error = copyout(sa, uap->from, fromlen);
1059 } else {
1060 fromlen = 0;
1061 }
1062 if (error == 0) {
1063 error = copyout(&fromlen, uap->fromlenaddr,
1064 sizeof(fromlen));
1065 }
1066 }
1067 if (sa)
1068 kfree(sa, M_SONAME);
1069
1070 return (error);
1071 }
1072
1073 /*
1074 * recvmsg_args(int s, struct msghdr *msg, int flags)
1075 *
1076 * MPALMOSTSAFE
1077 */
1078 int
sys_recvmsg(struct sysmsg * sysmsg,const struct recvmsg_args * uap)1079 sys_recvmsg(struct sysmsg *sysmsg, const struct recvmsg_args *uap)
1080 {
1081 struct thread *td = curthread;
1082 struct msghdr msg;
1083 struct uio auio;
1084 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
1085 struct mbuf *m, *control = NULL;
1086 struct sockaddr *sa = NULL;
1087 caddr_t ctlbuf;
1088 socklen_t *ufromlenp, *ucontrollenp;
1089 int error, fromlen, controllen, len, flags, *uflagsp;
1090
1091 /*
1092 * This copyin handles everything except the iovec.
1093 */
1094 error = copyin(uap->msg, &msg, sizeof(msg));
1095 if (error)
1096 return (error);
1097
1098 if (msg.msg_name && msg.msg_namelen < 0)
1099 return (EINVAL);
1100 if (msg.msg_control && msg.msg_controllen < 0)
1101 return (EINVAL);
1102
1103 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr,
1104 msg_namelen));
1105 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr,
1106 msg_controllen));
1107 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr,
1108 msg_flags));
1109
1110 /*
1111 * Populate auio.
1112 */
1113 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen,
1114 &auio.uio_resid);
1115 if (error)
1116 return (error);
1117 auio.uio_iov = iov;
1118 auio.uio_iovcnt = msg.msg_iovlen;
1119 auio.uio_offset = 0;
1120 auio.uio_segflg = UIO_USERSPACE;
1121 auio.uio_rw = UIO_READ;
1122 auio.uio_td = td;
1123
1124 flags = uap->flags;
1125
1126 error = kern_recvmsg(uap->s,
1127 (msg.msg_name ? &sa : NULL), &auio,
1128 (msg.msg_control ? &control : NULL), &flags,
1129 &sysmsg->sysmsg_szresult);
1130
1131 /*
1132 * Conditionally copyout the name and populate the namelen field.
1133 */
1134 if (error == 0 && msg.msg_name) {
1135 /* note: sa may still be NULL */
1136 if (sa != NULL) {
1137 fromlen = MIN(msg.msg_namelen, sa->sa_len);
1138 prison_local_ip(curthread, sa);
1139 error = copyout(sa, msg.msg_name, fromlen);
1140 } else {
1141 fromlen = 0;
1142 }
1143 if (error == 0)
1144 error = copyout(&fromlen, ufromlenp,
1145 sizeof(*ufromlenp));
1146 }
1147
1148 /*
1149 * Copyout msg.msg_control and msg.msg_controllen.
1150 */
1151 if (error == 0 && msg.msg_control) {
1152 len = msg.msg_controllen;
1153 m = control;
1154 ctlbuf = (caddr_t)msg.msg_control;
1155
1156 while(m && len > 0) {
1157 unsigned int tocopy;
1158
1159 if (len >= m->m_len) {
1160 tocopy = m->m_len;
1161 } else {
1162 msg.msg_flags |= MSG_CTRUNC;
1163 tocopy = len;
1164 }
1165
1166 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy);
1167 if (error)
1168 goto cleanup;
1169
1170 ctlbuf += tocopy;
1171 len -= tocopy;
1172 m = m->m_next;
1173 }
1174 controllen = ctlbuf - (caddr_t)msg.msg_control;
1175 error = copyout(&controllen, ucontrollenp,
1176 sizeof(*ucontrollenp));
1177 }
1178
1179 if (error == 0)
1180 error = copyout(&flags, uflagsp, sizeof(*uflagsp));
1181
1182 cleanup:
1183 if (sa)
1184 kfree(sa, M_SONAME);
1185 iovec_free(&iov, aiov);
1186 if (control)
1187 m_freem(control);
1188 return (error);
1189 }
1190
1191 /*
1192 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an
1193 * in kernel pointer instead of a userland pointer. This allows us
1194 * to manipulate socket options in the emulation code.
1195 */
1196 int
kern_setsockopt(int s,struct sockopt * sopt)1197 kern_setsockopt(int s, struct sockopt *sopt)
1198 {
1199 struct thread *td = curthread;
1200 struct file *fp;
1201 int error;
1202
1203 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0)
1204 return (EFAULT);
1205 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0)
1206 return (EINVAL);
1207 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */
1208 return (EINVAL);
1209
1210 error = holdsock(td, s, &fp);
1211 if (error)
1212 return (error);
1213
1214 error = sosetopt((struct socket *)fp->f_data, sopt);
1215 dropfp(td, s, fp);
1216
1217 return (error);
1218 }
1219
1220 /*
1221 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize)
1222 *
1223 * MPALMOSTSAFE
1224 */
1225 int
sys_setsockopt(struct sysmsg * sysmsg,const struct setsockopt_args * uap)1226 sys_setsockopt(struct sysmsg *sysmsg, const struct setsockopt_args *uap)
1227 {
1228 struct thread *td = curthread;
1229 struct sockopt sopt;
1230 int error;
1231
1232 sopt.sopt_level = uap->level;
1233 sopt.sopt_name = uap->name;
1234 sopt.sopt_valsize = uap->valsize;
1235 sopt.sopt_td = td;
1236 sopt.sopt_val = NULL;
1237
1238 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */
1239 return (EINVAL);
1240 if (uap->val) {
1241 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK);
1242 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize);
1243 if (error)
1244 goto out;
1245 }
1246
1247 error = kern_setsockopt(uap->s, &sopt);
1248 out:
1249 if (uap->val)
1250 kfree(sopt.sopt_val, M_TEMP);
1251 return(error);
1252 }
1253
1254 /*
1255 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an
1256 * in kernel pointer instead of a userland pointer. This allows us
1257 * to manipulate socket options in the emulation code.
1258 */
1259 int
kern_getsockopt(int s,struct sockopt * sopt)1260 kern_getsockopt(int s, struct sockopt *sopt)
1261 {
1262 struct thread *td = curthread;
1263 struct file *fp;
1264 int error;
1265
1266 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0)
1267 return (EFAULT);
1268 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0)
1269 return (EINVAL);
1270
1271 error = holdsock(td, s, &fp);
1272 if (error)
1273 return (error);
1274
1275 error = sogetopt((struct socket *)fp->f_data, sopt);
1276 dropfp(td, s, fp);
1277
1278 return (error);
1279 }
1280
1281 /*
1282 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize)
1283 *
1284 * MPALMOSTSAFE
1285 */
1286 int
sys_getsockopt(struct sysmsg * sysmsg,const struct getsockopt_args * uap)1287 sys_getsockopt(struct sysmsg *sysmsg, const struct getsockopt_args *uap)
1288 {
1289 struct thread *td = curthread;
1290 struct sockopt sopt;
1291 int error, valsize, valszmax, mflag = 0;
1292
1293 if (uap->val) {
1294 error = copyin(uap->avalsize, &valsize, sizeof(valsize));
1295 if (error)
1296 return (error);
1297 } else {
1298 valsize = 0;
1299 }
1300
1301 sopt.sopt_level = uap->level;
1302 sopt.sopt_name = uap->name;
1303 sopt.sopt_valsize = valsize;
1304 sopt.sopt_td = td;
1305 sopt.sopt_val = NULL;
1306
1307 if (td->td_proc->p_ucred->cr_uid == 0) {
1308 valszmax = SOMAXOPT_SIZE0;
1309 mflag = M_NULLOK;
1310 } else {
1311 valszmax = SOMAXOPT_SIZE;
1312 }
1313 if (sopt.sopt_valsize > valszmax) /* unsigned */
1314 return (EINVAL);
1315 if (uap->val) {
1316 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP,
1317 M_WAITOK | mflag);
1318 if (sopt.sopt_val == NULL)
1319 return (ENOBUFS);
1320 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize);
1321 if (error)
1322 goto out;
1323 }
1324
1325 error = kern_getsockopt(uap->s, &sopt);
1326 if (error)
1327 goto out;
1328 valsize = sopt.sopt_valsize;
1329 error = copyout(&valsize, uap->avalsize, sizeof(valsize));
1330 if (error)
1331 goto out;
1332 if (uap->val)
1333 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize);
1334 out:
1335 if (uap->val)
1336 kfree(sopt.sopt_val, M_TEMP);
1337 return (error);
1338 }
1339
1340 /*
1341 * The second argument to kern_getsockname() is a handle to a struct sockaddr.
1342 * This allows kern_getsockname() to return a pointer to an allocated struct
1343 * sockaddr which must be freed later with FREE(). The caller must
1344 * initialize *name to NULL.
1345 */
1346 int
kern_getsockname(int s,struct sockaddr ** name,int * namelen)1347 kern_getsockname(int s, struct sockaddr **name, int *namelen)
1348 {
1349 struct thread *td = curthread;
1350 struct file *fp;
1351 struct socket *so;
1352 struct sockaddr *sa = NULL;
1353 int error;
1354
1355 error = holdsock(td, s, &fp);
1356 if (error)
1357 return (error);
1358 if (*namelen < 0) {
1359 fdrop(fp);
1360 return (EINVAL);
1361 }
1362 so = (struct socket *)fp->f_data;
1363 error = so_pru_sockaddr(so, &sa);
1364 if (error == 0) {
1365 if (sa == NULL) {
1366 *namelen = 0;
1367 } else {
1368 *namelen = MIN(*namelen, sa->sa_len);
1369 *name = sa;
1370 }
1371 }
1372 dropfp(td, s, fp);
1373
1374 return (error);
1375 }
1376
1377 /*
1378 * getsockname_args(int fdes, caddr_t asa, int *alen)
1379 *
1380 * Get socket name.
1381 *
1382 * MPALMOSTSAFE
1383 */
1384 int
sys_getsockname(struct sysmsg * sysmsg,const struct getsockname_args * uap)1385 sys_getsockname(struct sysmsg *sysmsg, const struct getsockname_args *uap)
1386 {
1387 struct sockaddr *sa = NULL;
1388 struct sockaddr satmp;
1389 int error, sa_len_in, sa_len_out;
1390
1391 error = copyin(uap->alen, &sa_len_in, sizeof(sa_len_in));
1392 if (error)
1393 return (error);
1394
1395 sa_len_out = sa_len_in;
1396 error = kern_getsockname(uap->fdes, &sa, &sa_len_out);
1397
1398 if (error == 0) {
1399 if (sa) {
1400 prison_local_ip(curthread, sa);
1401 error = copyout(sa, uap->asa, sa_len_out);
1402 } else {
1403 /*
1404 * unnamed uipc sockets don't bother storing
1405 * sockaddr, simulate an AF_LOCAL sockaddr.
1406 */
1407 sa_len_out = sizeof(satmp);
1408 if (sa_len_out > sa_len_in)
1409 sa_len_out = sa_len_in;
1410 if (sa_len_out < 0)
1411 sa_len_out = 0;
1412 bzero(&satmp, sizeof(satmp));
1413 satmp.sa_len = sa_len_out;
1414 satmp.sa_family = AF_LOCAL;
1415 error = copyout(&satmp, uap->asa, sa_len_out);
1416 }
1417 }
1418 if (error == 0 && sa_len_out != sa_len_in)
1419 error = copyout(&sa_len_out, uap->alen, sizeof(*uap->alen));
1420 if (sa)
1421 kfree(sa, M_SONAME);
1422 return (error);
1423 }
1424
1425 /*
1426 * The second argument to kern_getpeername() is a handle to a struct sockaddr.
1427 * This allows kern_getpeername() to return a pointer to an allocated struct
1428 * sockaddr which must be freed later with FREE(). The caller must
1429 * initialize *name to NULL.
1430 */
1431 int
kern_getpeername(int s,struct sockaddr ** name,int * namelen)1432 kern_getpeername(int s, struct sockaddr **name, int *namelen)
1433 {
1434 struct thread *td = curthread;
1435 struct file *fp;
1436 struct socket *so;
1437 struct sockaddr *sa = NULL;
1438 int error;
1439
1440 error = holdsock(td, s, &fp);
1441 if (error)
1442 return (error);
1443 if (*namelen < 0) {
1444 fdrop(fp);
1445 return (EINVAL);
1446 }
1447 so = (struct socket *)fp->f_data;
1448 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1449 fdrop(fp);
1450 return (ENOTCONN);
1451 }
1452 error = so_pru_peeraddr(so, &sa);
1453 if (error == 0) {
1454 if (sa == NULL) {
1455 *namelen = 0;
1456 } else {
1457 *namelen = MIN(*namelen, sa->sa_len);
1458 *name = sa;
1459 }
1460 }
1461 dropfp(td, s, fp);
1462
1463 return (error);
1464 }
1465
1466 /*
1467 * getpeername_args(int fdes, caddr_t asa, int *alen)
1468 *
1469 * Get name of peer for connected socket.
1470 *
1471 * MPALMOSTSAFE
1472 */
1473 int
sys_getpeername(struct sysmsg * sysmsg,const struct getpeername_args * uap)1474 sys_getpeername(struct sysmsg *sysmsg, const struct getpeername_args *uap)
1475 {
1476 struct sockaddr *sa = NULL;
1477 int error, sa_len;
1478
1479 error = copyin(uap->alen, &sa_len, sizeof(sa_len));
1480 if (error)
1481 return (error);
1482
1483 error = kern_getpeername(uap->fdes, &sa, &sa_len);
1484
1485 if (error == 0) {
1486 prison_local_ip(curthread, sa);
1487 error = copyout(sa, uap->asa, sa_len);
1488 }
1489 if (error == 0)
1490 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen));
1491 if (sa)
1492 kfree(sa, M_SONAME);
1493 return (error);
1494 }
1495
1496 int
getsockaddr(struct sockaddr ** namp,caddr_t uaddr,size_t len)1497 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len)
1498 {
1499 struct sockaddr *sa;
1500 int error;
1501
1502 *namp = NULL;
1503 if (len > SOCK_MAXADDRLEN)
1504 return ENAMETOOLONG;
1505 if (len < offsetof(struct sockaddr, sa_data[0]))
1506 return EDOM;
1507 sa = kmalloc(len, M_SONAME, M_WAITOK);
1508 error = copyin(uaddr, sa, len);
1509 if (error) {
1510 kfree(sa, M_SONAME);
1511 } else {
1512 sa->sa_len = len;
1513 *namp = sa;
1514 }
1515 return error;
1516 }
1517
1518 /*
1519 * Detach a mapped page and release resources back to the system.
1520 * We must release our wiring and if the object is ripped out
1521 * from under the vm_page we become responsible for freeing the
1522 * page.
1523 *
1524 * MPSAFE
1525 */
1526 static void
sf_buf_mfree(void * arg)1527 sf_buf_mfree(void *arg)
1528 {
1529 struct sf_buf *sf = arg;
1530 vm_page_t m;
1531
1532 m = sf_buf_page(sf);
1533 if (sf_buf_free(sf)) {
1534 /* sf invalid now */
1535 vm_page_sbusy_drop(m);
1536 #if 0
1537 if (m->object == NULL &&
1538 m->wire_count == 0 &&
1539 (m->flags & PG_NEED_COMMIT) == 0) {
1540 vm_page_free(m);
1541 } else {
1542 vm_page_wakeup(m);
1543 }
1544 #endif
1545 }
1546 }
1547
1548 /*
1549 * sendfile(2).
1550 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1551 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1552 *
1553 * Send a file specified by 'fd' and starting at 'offset' to a socket
1554 * specified by 's'. Send only 'nbytes' of the file or until EOF if
1555 * nbytes == 0. Optionally add a header and/or trailer to the socket
1556 * output. If specified, write the total number of bytes sent into *sbytes.
1557 *
1558 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused
1559 * the headers to count against the remaining bytes to be sent from
1560 * the file descriptor. We may wish to implement a compatibility syscall
1561 * in the future.
1562 *
1563 * MPALMOSTSAFE
1564 */
1565 int
sys_sendfile(struct sysmsg * sysmsg,const struct sendfile_args * uap)1566 sys_sendfile(struct sysmsg *sysmsg, const struct sendfile_args *uap)
1567 {
1568 struct thread *td = curthread;
1569 struct file *fp;
1570 struct vnode *vp = NULL;
1571 struct sf_hdtr hdtr;
1572 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
1573 struct uio auio;
1574 struct mbuf *mheader = NULL;
1575 size_t hbytes = 0;
1576 size_t tbytes;
1577 off_t hdtr_size = 0;
1578 off_t sbytes;
1579 int error;
1580
1581 /*
1582 * Do argument checking. Must be a regular file in, stream
1583 * type and connected socket out, positive offset.
1584 */
1585 fp = holdfp(td, uap->fd, FREAD);
1586 if (fp == NULL) {
1587 return (EBADF);
1588 }
1589 if (fp->f_type != DTYPE_VNODE) {
1590 fdrop(fp);
1591 return (EINVAL);
1592 }
1593 vp = (struct vnode *)fp->f_data;
1594 vref(vp);
1595 dropfp(td, uap->fd, fp);
1596
1597 /*
1598 * If specified, get the pointer to the sf_hdtr struct for
1599 * any headers/trailers.
1600 */
1601 if (uap->hdtr) {
1602 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
1603 if (error)
1604 goto done;
1605 /*
1606 * Send any headers.
1607 */
1608 if (hdtr.headers) {
1609 error = iovec_copyin(hdtr.headers, &iov, aiov,
1610 hdtr.hdr_cnt, &hbytes);
1611 if (error)
1612 goto done;
1613 auio.uio_iov = iov;
1614 auio.uio_iovcnt = hdtr.hdr_cnt;
1615 auio.uio_offset = 0;
1616 auio.uio_segflg = UIO_USERSPACE;
1617 auio.uio_rw = UIO_WRITE;
1618 auio.uio_td = td;
1619 auio.uio_resid = hbytes;
1620
1621 mheader = m_uiomove(&auio);
1622
1623 iovec_free(&iov, aiov);
1624 if (mheader == NULL)
1625 goto done;
1626 }
1627 }
1628
1629 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader,
1630 &sbytes, uap->flags);
1631 if (error)
1632 goto done;
1633
1634 /*
1635 * Send trailers. Wimp out and use writev(2).
1636 */
1637 if (uap->hdtr != NULL && hdtr.trailers != NULL) {
1638 error = iovec_copyin(hdtr.trailers, &iov, aiov,
1639 hdtr.trl_cnt, &auio.uio_resid);
1640 if (error)
1641 goto done;
1642 auio.uio_iov = iov;
1643 auio.uio_iovcnt = hdtr.trl_cnt;
1644 auio.uio_offset = 0;
1645 auio.uio_segflg = UIO_USERSPACE;
1646 auio.uio_rw = UIO_WRITE;
1647 auio.uio_td = td;
1648
1649 tbytes = 0; /* avoid gcc warnings */
1650 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes);
1651
1652 iovec_free(&iov, aiov);
1653 if (error)
1654 goto done;
1655 hdtr_size += tbytes; /* trailer bytes successfully sent */
1656 }
1657
1658 done:
1659 if (vp)
1660 vrele(vp);
1661 if (uap->sbytes != NULL) {
1662 sbytes += hdtr_size;
1663 copyout(&sbytes, uap->sbytes, sizeof(off_t));
1664 }
1665 return (error);
1666 }
1667
1668 int
kern_sendfile(struct vnode * vp,int sfd,off_t offset,size_t nbytes,struct mbuf * mheader,off_t * sbytes,int flags)1669 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes,
1670 struct mbuf *mheader, off_t *sbytes, int flags)
1671 {
1672 struct thread *td = curthread;
1673 struct vm_object *obj;
1674 struct socket *so;
1675 struct file *fp;
1676 struct mbuf *m, *mp;
1677 struct sf_buf *sf;
1678 struct vm_page *pg;
1679 off_t off, xfsize, xbytes;
1680 off_t hbytes = 0;
1681 int error = 0;
1682
1683 if (vp->v_type != VREG) {
1684 error = EINVAL;
1685 goto done0;
1686 }
1687 if ((obj = vp->v_object) == NULL) {
1688 error = EINVAL;
1689 goto done0;
1690 }
1691 error = holdsock(td, sfd, &fp);
1692 if (error)
1693 goto done0;
1694 so = (struct socket *)fp->f_data;
1695 if (so->so_type != SOCK_STREAM) {
1696 error = EINVAL;
1697 goto done1;
1698 }
1699 if ((so->so_state & SS_ISCONNECTED) == 0) {
1700 error = ENOTCONN;
1701 goto done1;
1702 }
1703 if (offset < 0) {
1704 error = EINVAL;
1705 goto done1;
1706 }
1707
1708 /*
1709 * preallocation is required for asynchronous passing of mbufs,
1710 * otherwise we can wind up building up an infinite number of
1711 * mbufs during the asynchronous latency.
1712 */
1713 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) {
1714 error = EINVAL;
1715 goto done1;
1716 }
1717
1718 *sbytes = 0;
1719 xbytes = 0;
1720
1721 /*
1722 * Protect against multiple writers to the socket.
1723 * We need at least a shared lock on the VM object
1724 */
1725 ssb_lock(&so->so_snd, M_WAITOK);
1726 vm_object_hold_shared(obj);
1727
1728 /*
1729 * Loop through the pages in the file, starting with the requested
1730 * offset. Get a file page (do I/O if necessary), map the file page
1731 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
1732 * it on the socket.
1733 */
1734 for (off = offset; ;
1735 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) {
1736 vm_pindex_t pindex;
1737 vm_offset_t pgoff;
1738 long space;
1739 int loops;
1740
1741 pindex = OFF_TO_IDX(off);
1742 loops = 0;
1743
1744 retry_lookup:
1745 /*
1746 * Calculate the amount to transfer. Not to exceed a page,
1747 * the EOF, or the passed in nbytes.
1748 */
1749 xfsize = vp->v_filesize - off;
1750 if (xfsize > PAGE_SIZE)
1751 xfsize = PAGE_SIZE;
1752 pgoff = (vm_offset_t)(off & PAGE_MASK);
1753 if (PAGE_SIZE - pgoff < xfsize)
1754 xfsize = PAGE_SIZE - pgoff;
1755 if (nbytes && xfsize > (nbytes - xbytes))
1756 xfsize = nbytes - xbytes;
1757 if (xfsize <= 0)
1758 break;
1759 /*
1760 * Optimize the non-blocking case by looking at the socket space
1761 * before going to the extra work of constituting the sf_buf.
1762 */
1763 if (so->so_snd.ssb_flags & SSB_PREALLOC)
1764 space = ssb_space_prealloc(&so->so_snd);
1765 else
1766 space = ssb_space(&so->so_snd);
1767
1768 if ((fp->f_flag & FNONBLOCK) && space <= 0) {
1769 if (so->so_state & SS_CANTSENDMORE)
1770 error = EPIPE;
1771 else
1772 error = EAGAIN;
1773 goto done;
1774 }
1775
1776 /*
1777 * Attempt to look up the page.
1778 *
1779 * Try to find the data using a shared vm_object token and
1780 * vm_page_lookup_sbusy_try() first.
1781 *
1782 * If data is missing, use a UIO_NOCOPY VOP_READ to load
1783 * the missing data and loop back up. We avoid all sorts
1784 * of problems by not trying to hold onto the page during
1785 * the I/O.
1786 *
1787 * NOTE: The soft-busy will temporary block filesystem
1788 * truncation operations when a file is removed
1789 * while the sendfile is running.
1790 */
1791 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize);
1792 if (pg == NULL) {
1793 struct uio auio;
1794 struct iovec aiov;
1795 int bsize;
1796
1797 if (++loops > 100000) {
1798 kprintf("sendfile: VOP operation failed "
1799 "to retain page\n");
1800 error = EIO;
1801 goto done;
1802 }
1803
1804 vm_object_drop(obj);
1805 bsize = vp->v_mount->mnt_stat.f_iosize;
1806 auio.uio_iov = &aiov;
1807 auio.uio_iovcnt = 1;
1808 aiov.iov_base = 0;
1809 aiov.iov_len = MAXBSIZE;
1810 auio.uio_resid = MAXBSIZE;
1811 auio.uio_offset = trunc_page(off);
1812 auio.uio_segflg = UIO_NOCOPY;
1813 auio.uio_rw = UIO_READ;
1814 auio.uio_td = td;
1815
1816 vn_lock(vp, LK_SHARED | LK_RETRY);
1817 error = VOP_READ_FP(vp, &auio,
1818 IO_VMIO | ((MAXBSIZE / bsize) << 16),
1819 td->td_ucred, fp);
1820 vn_unlock(vp);
1821 vm_object_hold_shared(obj);
1822
1823 if (error)
1824 goto done;
1825 goto retry_lookup;
1826 }
1827
1828 /*
1829 * Get a sendfile buf. We usually wait as long as necessary,
1830 * but this wait can be interrupted.
1831 */
1832 if ((sf = sf_buf_alloc(pg)) == NULL) {
1833 vm_page_sbusy_drop(pg);
1834 /* vm_page_try_to_free(pg); */
1835 error = EINTR;
1836 goto done;
1837 }
1838
1839 /*
1840 * Get an mbuf header and set it up as having external storage.
1841 */
1842 MGETHDR(m, M_WAITOK, MT_DATA);
1843 m->m_ext.ext_free = sf_buf_mfree;
1844 m->m_ext.ext_ref = sf_buf_ref;
1845 m->m_ext.ext_arg = sf;
1846 m->m_ext.ext_buf = (void *)sf_buf_kva(sf);
1847 m->m_ext.ext_size = PAGE_SIZE;
1848 m->m_data = (char *)sf_buf_kva(sf) + pgoff;
1849 m->m_flags |= M_EXT;
1850 m->m_pkthdr.len = m->m_len = xfsize;
1851 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0);
1852
1853 if (mheader != NULL) {
1854 hbytes = mheader->m_pkthdr.len;
1855 mheader->m_pkthdr.len += m->m_pkthdr.len;
1856 m_cat(mheader, m);
1857 m = mheader;
1858 mheader = NULL;
1859 } else {
1860 hbytes = 0;
1861 }
1862
1863 /*
1864 * Add the buffer to the socket buffer chain.
1865 */
1866 crit_enter();
1867 retry_space:
1868 /*
1869 * Make sure that the socket is still able to take more data.
1870 * CANTSENDMORE being true usually means that the connection
1871 * was closed. so_error is true when an error was sensed after
1872 * a previous send.
1873 * The state is checked after the page mapping and buffer
1874 * allocation above since those operations may block and make
1875 * any socket checks stale. From this point forward, nothing
1876 * blocks before the pru_send (or more accurately, any blocking
1877 * results in a loop back to here to re-check).
1878 */
1879 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) {
1880 if (so->so_state & SS_CANTSENDMORE) {
1881 error = EPIPE;
1882 } else {
1883 error = so->so_error;
1884 so->so_error = 0;
1885 }
1886 m_freem(m);
1887 crit_exit();
1888 goto done;
1889 }
1890 /*
1891 * Wait for socket space to become available. We do this just
1892 * after checking the connection state above in order to avoid
1893 * a race condition with ssb_wait().
1894 */
1895 if (so->so_snd.ssb_flags & SSB_PREALLOC)
1896 space = ssb_space_prealloc(&so->so_snd);
1897 else
1898 space = ssb_space(&so->so_snd);
1899
1900 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) {
1901 if (fp->f_flag & FNONBLOCK) {
1902 m_freem(m);
1903 crit_exit();
1904 error = EAGAIN;
1905 goto done;
1906 }
1907 error = ssb_wait(&so->so_snd);
1908 /*
1909 * An error from ssb_wait usually indicates that we've
1910 * been interrupted by a signal. If we've sent anything
1911 * then return bytes sent, otherwise return the error.
1912 */
1913 if (error) {
1914 m_freem(m);
1915 crit_exit();
1916 goto done;
1917 }
1918 goto retry_space;
1919 }
1920
1921 if (so->so_snd.ssb_flags & SSB_PREALLOC) {
1922 for (mp = m; mp != NULL; mp = mp->m_next)
1923 ssb_preallocstream(&so->so_snd, mp);
1924 }
1925 if (use_sendfile_async)
1926 error = so_pru_senda(so, 0, m, NULL, NULL, td);
1927 else
1928 error = so_pru_send(so, 0, m, NULL, NULL, td);
1929
1930 crit_exit();
1931 if (error)
1932 goto done;
1933 }
1934 if (mheader != NULL) {
1935 *sbytes += mheader->m_pkthdr.len;
1936
1937 if (so->so_snd.ssb_flags & SSB_PREALLOC) {
1938 for (mp = mheader; mp != NULL; mp = mp->m_next)
1939 ssb_preallocstream(&so->so_snd, mp);
1940 }
1941 if (use_sendfile_async)
1942 error = so_pru_senda(so, 0, mheader, NULL, NULL, td);
1943 else
1944 error = so_pru_send(so, 0, mheader, NULL, NULL, td);
1945
1946 mheader = NULL;
1947 }
1948 done:
1949 vm_object_drop(obj);
1950 ssb_unlock(&so->so_snd);
1951 done1:
1952 dropfp(td, sfd, fp);
1953 done0:
1954 if (mheader != NULL)
1955 m_freem(mheader);
1956 return (error);
1957 }
1958