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 * 4. 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 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/10/sys/kern/uipc_syscalls.c 339068 2018-10-01 18:00:52Z asomers $");
37
38 #include "opt_capsicum.h"
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41 #include "opt_compat.h"
42 #include "opt_ktrace.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/capsicum.h>
47 #include <sys/condvar.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/mutex.h>
51 #include <sys/sysproto.h>
52 #include <sys/malloc.h>
53 #include <sys/filedesc.h>
54 #include <sys/event.h>
55 #include <sys/proc.h>
56 #include <sys/fcntl.h>
57 #include <sys/file.h>
58 #include <sys/filio.h>
59 #include <sys/jail.h>
60 #include <sys/mman.h>
61 #include <sys/mount.h>
62 #include <sys/mbuf.h>
63 #include <sys/protosw.h>
64 #include <sys/rwlock.h>
65 #include <sys/sf_buf.h>
66 #include <sys/sysent.h>
67 #include <sys/socket.h>
68 #include <sys/socketvar.h>
69 #include <sys/signalvar.h>
70 #include <sys/syscallsubr.h>
71 #include <sys/sysctl.h>
72 #include <sys/uio.h>
73 #include <sys/un.h>
74 #include <sys/unpcb.h>
75 #include <sys/vnode.h>
76 #ifdef KTRACE
77 #include <sys/ktrace.h>
78 #endif
79 #ifdef COMPAT_FREEBSD32
80 #include <compat/freebsd32/freebsd32_util.h>
81 #endif
82
83 #include <net/vnet.h>
84
85 #include <security/audit/audit.h>
86 #include <security/mac/mac_framework.h>
87
88 #include <vm/vm.h>
89 #include <vm/vm_param.h>
90 #include <vm/vm_object.h>
91 #include <vm/vm_page.h>
92 #include <vm/vm_pager.h>
93 #include <vm/vm_kern.h>
94 #include <vm/vm_extern.h>
95
96 /*
97 * Flags for accept1() and kern_accept4(), in addition to SOCK_CLOEXEC
98 * and SOCK_NONBLOCK.
99 */
100 #define ACCEPT4_INHERIT 0x1
101 #define ACCEPT4_COMPAT 0x2
102
103 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
104 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
105
106 static int accept1(struct thread *td, int s, struct sockaddr *uname,
107 socklen_t *anamelen, int flags);
108 static int do_sendfile(struct thread *td, struct sendfile_args *uap,
109 int compat);
110 static int getsockname1(struct thread *td, struct getsockname_args *uap,
111 int compat);
112 static int getpeername1(struct thread *td, struct getpeername_args *uap,
113 int compat);
114
115 counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
116
117 /*
118 * sendfile(2)-related variables and associated sysctls
119 */
120 static SYSCTL_NODE(_kern_ipc, OID_AUTO, sendfile, CTLFLAG_RW, 0,
121 "sendfile(2) tunables");
122 static int sfreadahead = 1;
123 SYSCTL_INT(_kern_ipc_sendfile, OID_AUTO, readahead, CTLFLAG_RW,
124 &sfreadahead, 0, "Number of sendfile(2) read-ahead MAXBSIZE blocks");
125
126
127 static void
sfstat_init(const void * unused)128 sfstat_init(const void *unused)
129 {
130
131 COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
132 M_WAITOK);
133 }
134 SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
135
136 static int
sfstat_sysctl(SYSCTL_HANDLER_ARGS)137 sfstat_sysctl(SYSCTL_HANDLER_ARGS)
138 {
139 struct sfstat s;
140
141 COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
142 if (req->newptr)
143 COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
144 return (SYSCTL_OUT(req, &s, sizeof(s)));
145 }
146 SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat, CTLTYPE_OPAQUE | CTLFLAG_RW,
147 NULL, 0, sfstat_sysctl, "I", "sendfile statistics");
148
149 /*
150 * Convert a user file descriptor to a kernel file entry and check if required
151 * capability rights are present.
152 * A reference on the file entry is held upon returning.
153 */
154 int
getsock_cap(struct thread * td,int fd,cap_rights_t * rightsp,struct file ** fpp,u_int * fflagp)155 getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
156 struct file **fpp, u_int *fflagp)
157 {
158 struct file *fp;
159 int error;
160
161 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, 0, &fp, NULL);
162 if (error != 0)
163 return (error);
164 if (fp->f_type != DTYPE_SOCKET) {
165 fdrop(fp, td);
166 return (ENOTSOCK);
167 }
168 if (fflagp != NULL)
169 *fflagp = fp->f_flag;
170 *fpp = fp;
171 return (0);
172 }
173
174 /*
175 * System call interface to the socket abstraction.
176 */
177 #if defined(COMPAT_43)
178 #define COMPAT_OLDSOCK
179 #endif
180
181 int
sys_socket(td,uap)182 sys_socket(td, uap)
183 struct thread *td;
184 struct socket_args /* {
185 int domain;
186 int type;
187 int protocol;
188 } */ *uap;
189 {
190 struct socket *so;
191 struct file *fp;
192 int fd, error, type, oflag, fflag;
193
194 AUDIT_ARG_SOCKET(uap->domain, uap->type, uap->protocol);
195
196 type = uap->type;
197 oflag = 0;
198 fflag = 0;
199 if ((type & SOCK_CLOEXEC) != 0) {
200 type &= ~SOCK_CLOEXEC;
201 oflag |= O_CLOEXEC;
202 }
203 if ((type & SOCK_NONBLOCK) != 0) {
204 type &= ~SOCK_NONBLOCK;
205 fflag |= FNONBLOCK;
206 }
207
208 #ifdef MAC
209 error = mac_socket_check_create(td->td_ucred, uap->domain, type,
210 uap->protocol);
211 if (error != 0)
212 return (error);
213 #endif
214 error = falloc(td, &fp, &fd, oflag);
215 if (error != 0)
216 return (error);
217 /* An extra reference on `fp' has been held for us by falloc(). */
218 error = socreate(uap->domain, &so, type, uap->protocol,
219 td->td_ucred, td);
220 if (error != 0) {
221 fdclose(td, fp, fd);
222 } else {
223 finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops);
224 if ((fflag & FNONBLOCK) != 0)
225 (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td);
226 td->td_retval[0] = fd;
227 }
228 fdrop(fp, td);
229 return (error);
230 }
231
232 /* ARGSUSED */
233 int
sys_bind(td,uap)234 sys_bind(td, uap)
235 struct thread *td;
236 struct bind_args /* {
237 int s;
238 caddr_t name;
239 int namelen;
240 } */ *uap;
241 {
242 struct sockaddr *sa;
243 int error;
244
245 error = getsockaddr(&sa, uap->name, uap->namelen);
246 if (error == 0) {
247 error = kern_bind(td, uap->s, sa);
248 free(sa, M_SONAME);
249 }
250 return (error);
251 }
252
253 static int
kern_bindat(struct thread * td,int dirfd,int fd,struct sockaddr * sa)254 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
255 {
256 struct socket *so;
257 struct file *fp;
258 cap_rights_t rights;
259 int error;
260
261 AUDIT_ARG_FD(fd);
262 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
263 error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_BIND),
264 &fp, NULL);
265 if (error != 0)
266 return (error);
267 so = fp->f_data;
268 #ifdef KTRACE
269 if (KTRPOINT(td, KTR_STRUCT))
270 ktrsockaddr(sa);
271 #endif
272 #ifdef MAC
273 error = mac_socket_check_bind(td->td_ucred, so, sa);
274 if (error == 0) {
275 #endif
276 if (dirfd == AT_FDCWD)
277 error = sobind(so, sa, td);
278 else
279 error = sobindat(dirfd, so, sa, td);
280 #ifdef MAC
281 }
282 #endif
283 fdrop(fp, td);
284 return (error);
285 }
286
287 int
kern_bind(struct thread * td,int fd,struct sockaddr * sa)288 kern_bind(struct thread *td, int fd, struct sockaddr *sa)
289 {
290
291 return (kern_bindat(td, AT_FDCWD, fd, sa));
292 }
293
294 /* ARGSUSED */
295 int
sys_bindat(td,uap)296 sys_bindat(td, uap)
297 struct thread *td;
298 struct bindat_args /* {
299 int fd;
300 int s;
301 caddr_t name;
302 int namelen;
303 } */ *uap;
304 {
305 struct sockaddr *sa;
306 int error;
307
308 error = getsockaddr(&sa, uap->name, uap->namelen);
309 if (error == 0) {
310 error = kern_bindat(td, uap->fd, uap->s, sa);
311 free(sa, M_SONAME);
312 }
313 return (error);
314 }
315
316 /* ARGSUSED */
317 int
sys_listen(td,uap)318 sys_listen(td, uap)
319 struct thread *td;
320 struct listen_args /* {
321 int s;
322 int backlog;
323 } */ *uap;
324 {
325 struct socket *so;
326 struct file *fp;
327 cap_rights_t rights;
328 int error;
329
330 AUDIT_ARG_FD(uap->s);
331 error = getsock_cap(td, uap->s, cap_rights_init(&rights, CAP_LISTEN),
332 &fp, NULL);
333 if (error == 0) {
334 so = fp->f_data;
335 #ifdef MAC
336 error = mac_socket_check_listen(td->td_ucred, so);
337 if (error == 0)
338 #endif
339 error = solisten(so, uap->backlog, td);
340 fdrop(fp, td);
341 }
342 return(error);
343 }
344
345 /*
346 * accept1()
347 */
348 static int
accept1(td,s,uname,anamelen,flags)349 accept1(td, s, uname, anamelen, flags)
350 struct thread *td;
351 int s;
352 struct sockaddr *uname;
353 socklen_t *anamelen;
354 int flags;
355 {
356 struct sockaddr *name;
357 socklen_t namelen;
358 struct file *fp;
359 int error;
360
361 if (uname == NULL)
362 return (kern_accept4(td, s, NULL, NULL, flags, NULL));
363
364 error = copyin(anamelen, &namelen, sizeof (namelen));
365 if (error != 0)
366 return (error);
367
368 error = kern_accept4(td, s, &name, &namelen, flags, &fp);
369
370 /*
371 * return a namelen of zero for older code which might
372 * ignore the return value from accept.
373 */
374 if (error != 0) {
375 (void) copyout(&namelen, anamelen, sizeof(*anamelen));
376 return (error);
377 }
378
379 if (error == 0 && uname != NULL) {
380 #ifdef COMPAT_OLDSOCK
381 if (flags & ACCEPT4_COMPAT)
382 ((struct osockaddr *)name)->sa_family =
383 name->sa_family;
384 #endif
385 error = copyout(name, uname, namelen);
386 }
387 if (error == 0)
388 error = copyout(&namelen, anamelen,
389 sizeof(namelen));
390 if (error != 0)
391 fdclose(td, fp, td->td_retval[0]);
392 fdrop(fp, td);
393 free(name, M_SONAME);
394 return (error);
395 }
396
397 int
kern_accept(struct thread * td,int s,struct sockaddr ** name,socklen_t * namelen,struct file ** fp)398 kern_accept(struct thread *td, int s, struct sockaddr **name,
399 socklen_t *namelen, struct file **fp)
400 {
401 return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp));
402 }
403
404 int
kern_accept4(struct thread * td,int s,struct sockaddr ** name,socklen_t * namelen,int flags,struct file ** fp)405 kern_accept4(struct thread *td, int s, struct sockaddr **name,
406 socklen_t *namelen, int flags, struct file **fp)
407 {
408 struct file *headfp, *nfp = NULL;
409 struct sockaddr *sa = NULL;
410 struct socket *head, *so;
411 cap_rights_t rights;
412 u_int fflag;
413 pid_t pgid;
414 int error, fd, tmp;
415
416 if (name != NULL)
417 *name = NULL;
418
419 AUDIT_ARG_FD(s);
420 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_ACCEPT),
421 &headfp, &fflag);
422 if (error != 0)
423 return (error);
424 head = headfp->f_data;
425 if ((head->so_options & SO_ACCEPTCONN) == 0) {
426 error = EINVAL;
427 goto done;
428 }
429 #ifdef MAC
430 error = mac_socket_check_accept(td->td_ucred, head);
431 if (error != 0)
432 goto done;
433 #endif
434 error = falloc(td, &nfp, &fd, (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0);
435 if (error != 0)
436 goto done;
437 ACCEPT_LOCK();
438 if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) {
439 ACCEPT_UNLOCK();
440 error = EWOULDBLOCK;
441 goto noconnection;
442 }
443 while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
444 if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
445 head->so_error = ECONNABORTED;
446 break;
447 }
448 error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH,
449 "accept", 0);
450 if (error != 0) {
451 ACCEPT_UNLOCK();
452 goto noconnection;
453 }
454 }
455 if (head->so_error) {
456 error = head->so_error;
457 head->so_error = 0;
458 ACCEPT_UNLOCK();
459 goto noconnection;
460 }
461 so = TAILQ_FIRST(&head->so_comp);
462 KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
463 KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));
464
465 /*
466 * Before changing the flags on the socket, we have to bump the
467 * reference count. Otherwise, if the protocol calls sofree(),
468 * the socket will be released due to a zero refcount.
469 */
470 SOCK_LOCK(so); /* soref() and so_state update */
471 soref(so); /* file descriptor reference */
472
473 TAILQ_REMOVE(&head->so_comp, so, so_list);
474 head->so_qlen--;
475 if (flags & ACCEPT4_INHERIT)
476 so->so_state |= (head->so_state & SS_NBIO);
477 else
478 so->so_state |= (flags & SOCK_NONBLOCK) ? SS_NBIO : 0;
479 so->so_qstate &= ~SQ_COMP;
480 so->so_head = NULL;
481
482 SOCK_UNLOCK(so);
483 ACCEPT_UNLOCK();
484
485 /* An extra reference on `nfp' has been held for us by falloc(). */
486 td->td_retval[0] = fd;
487
488 /* connection has been removed from the listen queue */
489 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0);
490
491 if (flags & ACCEPT4_INHERIT) {
492 pgid = fgetown(&head->so_sigio);
493 if (pgid != 0)
494 fsetown(pgid, &so->so_sigio);
495 } else {
496 fflag &= ~(FNONBLOCK | FASYNC);
497 if (flags & SOCK_NONBLOCK)
498 fflag |= FNONBLOCK;
499 }
500
501 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
502 /* Sync socket nonblocking/async state with file flags */
503 tmp = fflag & FNONBLOCK;
504 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td);
505 tmp = fflag & FASYNC;
506 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td);
507 sa = 0;
508 error = soaccept(so, &sa);
509 if (error != 0) {
510 /*
511 * return a namelen of zero for older code which might
512 * ignore the return value from accept.
513 */
514 if (name)
515 *namelen = 0;
516 goto noconnection;
517 }
518 if (sa == NULL) {
519 if (name)
520 *namelen = 0;
521 goto done;
522 }
523 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa);
524 if (name) {
525 /* check sa_len before it is destroyed */
526 if (*namelen > sa->sa_len)
527 *namelen = sa->sa_len;
528 #ifdef KTRACE
529 if (KTRPOINT(td, KTR_STRUCT))
530 ktrsockaddr(sa);
531 #endif
532 *name = sa;
533 sa = NULL;
534 }
535 noconnection:
536 free(sa, M_SONAME);
537
538 /*
539 * close the new descriptor, assuming someone hasn't ripped it
540 * out from under us.
541 */
542 if (error != 0)
543 fdclose(td, nfp, fd);
544
545 /*
546 * Release explicitly held references before returning. We return
547 * a reference on nfp to the caller on success if they request it.
548 */
549 done:
550 if (fp != NULL) {
551 if (error == 0) {
552 *fp = nfp;
553 nfp = NULL;
554 } else
555 *fp = NULL;
556 }
557 if (nfp != NULL)
558 fdrop(nfp, td);
559 fdrop(headfp, td);
560 return (error);
561 }
562
563 int
sys_accept(td,uap)564 sys_accept(td, uap)
565 struct thread *td;
566 struct accept_args *uap;
567 {
568
569 return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT));
570 }
571
572 int
sys_accept4(td,uap)573 sys_accept4(td, uap)
574 struct thread *td;
575 struct accept4_args *uap;
576 {
577
578 if (uap->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
579 return (EINVAL);
580
581 return (accept1(td, uap->s, uap->name, uap->anamelen, uap->flags));
582 }
583
584 #ifdef COMPAT_OLDSOCK
585 int
oaccept(td,uap)586 oaccept(td, uap)
587 struct thread *td;
588 struct accept_args *uap;
589 {
590
591 return (accept1(td, uap->s, uap->name, uap->anamelen,
592 ACCEPT4_INHERIT | ACCEPT4_COMPAT));
593 }
594 #endif /* COMPAT_OLDSOCK */
595
596 /* ARGSUSED */
597 int
sys_connect(td,uap)598 sys_connect(td, uap)
599 struct thread *td;
600 struct connect_args /* {
601 int s;
602 caddr_t name;
603 int namelen;
604 } */ *uap;
605 {
606 struct sockaddr *sa;
607 int error;
608
609 error = getsockaddr(&sa, uap->name, uap->namelen);
610 if (error == 0) {
611 error = kern_connect(td, uap->s, sa);
612 free(sa, M_SONAME);
613 }
614 return (error);
615 }
616
617 static int
kern_connectat(struct thread * td,int dirfd,int fd,struct sockaddr * sa)618 kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
619 {
620 struct socket *so;
621 struct file *fp;
622 cap_rights_t rights;
623 int error, interrupted = 0;
624
625 AUDIT_ARG_FD(fd);
626 AUDIT_ARG_SOCKADDR(td, dirfd, sa);
627 error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_CONNECT),
628 &fp, NULL);
629 if (error != 0)
630 return (error);
631 so = fp->f_data;
632 if (so->so_state & SS_ISCONNECTING) {
633 error = EALREADY;
634 goto done1;
635 }
636 #ifdef KTRACE
637 if (KTRPOINT(td, KTR_STRUCT))
638 ktrsockaddr(sa);
639 #endif
640 #ifdef MAC
641 error = mac_socket_check_connect(td->td_ucred, so, sa);
642 if (error != 0)
643 goto bad;
644 #endif
645 if (dirfd == AT_FDCWD)
646 error = soconnect(so, sa, td);
647 else
648 error = soconnectat(dirfd, so, sa, td);
649 if (error != 0)
650 goto bad;
651 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
652 error = EINPROGRESS;
653 goto done1;
654 }
655 SOCK_LOCK(so);
656 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
657 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
658 "connec", 0);
659 if (error != 0) {
660 if (error == EINTR || error == ERESTART)
661 interrupted = 1;
662 break;
663 }
664 }
665 if (error == 0) {
666 error = so->so_error;
667 so->so_error = 0;
668 }
669 SOCK_UNLOCK(so);
670 bad:
671 if (!interrupted)
672 so->so_state &= ~SS_ISCONNECTING;
673 if (error == ERESTART)
674 error = EINTR;
675 done1:
676 fdrop(fp, td);
677 return (error);
678 }
679
680 int
kern_connect(struct thread * td,int fd,struct sockaddr * sa)681 kern_connect(struct thread *td, int fd, struct sockaddr *sa)
682 {
683
684 return (kern_connectat(td, AT_FDCWD, fd, sa));
685 }
686
687 /* ARGSUSED */
688 int
sys_connectat(td,uap)689 sys_connectat(td, uap)
690 struct thread *td;
691 struct connectat_args /* {
692 int fd;
693 int s;
694 caddr_t name;
695 int namelen;
696 } */ *uap;
697 {
698 struct sockaddr *sa;
699 int error;
700
701 error = getsockaddr(&sa, uap->name, uap->namelen);
702 if (error == 0) {
703 error = kern_connectat(td, uap->fd, uap->s, sa);
704 free(sa, M_SONAME);
705 }
706 return (error);
707 }
708
709 int
kern_socketpair(struct thread * td,int domain,int type,int protocol,int * rsv)710 kern_socketpair(struct thread *td, int domain, int type, int protocol,
711 int *rsv)
712 {
713 struct file *fp1, *fp2;
714 struct socket *so1, *so2;
715 int fd, error, oflag, fflag;
716
717 AUDIT_ARG_SOCKET(domain, type, protocol);
718
719 oflag = 0;
720 fflag = 0;
721 if ((type & SOCK_CLOEXEC) != 0) {
722 type &= ~SOCK_CLOEXEC;
723 oflag |= O_CLOEXEC;
724 }
725 if ((type & SOCK_NONBLOCK) != 0) {
726 type &= ~SOCK_NONBLOCK;
727 fflag |= FNONBLOCK;
728 }
729 #ifdef MAC
730 /* We might want to have a separate check for socket pairs. */
731 error = mac_socket_check_create(td->td_ucred, domain, type,
732 protocol);
733 if (error != 0)
734 return (error);
735 #endif
736 error = socreate(domain, &so1, type, protocol, td->td_ucred, td);
737 if (error != 0)
738 return (error);
739 error = socreate(domain, &so2, type, protocol, td->td_ucred, td);
740 if (error != 0)
741 goto free1;
742 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */
743 error = falloc(td, &fp1, &fd, oflag);
744 if (error != 0)
745 goto free2;
746 rsv[0] = fd;
747 fp1->f_data = so1; /* so1 already has ref count */
748 error = falloc(td, &fp2, &fd, oflag);
749 if (error != 0)
750 goto free3;
751 fp2->f_data = so2; /* so2 already has ref count */
752 rsv[1] = fd;
753 error = soconnect2(so1, so2);
754 if (error != 0)
755 goto free4;
756 if (type == SOCK_DGRAM) {
757 /*
758 * Datagram socket connection is asymmetric.
759 */
760 error = soconnect2(so2, so1);
761 if (error != 0)
762 goto free4;
763 } else if (so1->so_proto->pr_flags & PR_CONNREQUIRED) {
764 struct unpcb *unp, *unp2;
765 unp = sotounpcb(so1);
766 unp2 = sotounpcb(so2);
767 /*
768 * No need to lock the unps, because the sockets are brand-new.
769 * No other threads can be using them yet
770 */
771 unp_copy_peercred(td, unp, unp2, unp);
772 }
773 finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data,
774 &socketops);
775 finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data,
776 &socketops);
777 if ((fflag & FNONBLOCK) != 0) {
778 (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td);
779 (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td);
780 }
781 fdrop(fp1, td);
782 fdrop(fp2, td);
783 return (0);
784 free4:
785 fdclose(td, fp2, rsv[1]);
786 fdrop(fp2, td);
787 free3:
788 fdclose(td, fp1, rsv[0]);
789 fdrop(fp1, td);
790 free2:
791 if (so2 != NULL)
792 (void)soclose(so2);
793 free1:
794 if (so1 != NULL)
795 (void)soclose(so1);
796 return (error);
797 }
798
799 int
sys_socketpair(struct thread * td,struct socketpair_args * uap)800 sys_socketpair(struct thread *td, struct socketpair_args *uap)
801 {
802 int error, sv[2];
803
804 error = kern_socketpair(td, uap->domain, uap->type,
805 uap->protocol, sv);
806 if (error != 0)
807 return (error);
808 error = copyout(sv, uap->rsv, 2 * sizeof(int));
809 if (error != 0) {
810 (void)kern_close(td, sv[0]);
811 (void)kern_close(td, sv[1]);
812 }
813 return (error);
814 }
815
816 static int
sendit(td,s,mp,flags)817 sendit(td, s, mp, flags)
818 struct thread *td;
819 int s;
820 struct msghdr *mp;
821 int flags;
822 {
823 struct mbuf *control;
824 struct sockaddr *to;
825 int error;
826
827 #ifdef CAPABILITY_MODE
828 if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL))
829 return (ECAPMODE);
830 #endif
831
832 if (mp->msg_name != NULL) {
833 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen);
834 if (error != 0) {
835 to = NULL;
836 goto bad;
837 }
838 mp->msg_name = to;
839 } else {
840 to = NULL;
841 }
842
843 if (mp->msg_control) {
844 if (mp->msg_controllen < sizeof(struct cmsghdr)
845 #ifdef COMPAT_OLDSOCK
846 && mp->msg_flags != MSG_COMPAT
847 #endif
848 ) {
849 error = EINVAL;
850 goto bad;
851 }
852 error = sockargs(&control, mp->msg_control,
853 mp->msg_controllen, MT_CONTROL);
854 if (error != 0)
855 goto bad;
856 #ifdef COMPAT_OLDSOCK
857 if (mp->msg_flags == MSG_COMPAT) {
858 struct cmsghdr *cm;
859
860 M_PREPEND(control, sizeof(*cm), M_WAITOK);
861 cm = mtod(control, struct cmsghdr *);
862 cm->cmsg_len = control->m_len;
863 cm->cmsg_level = SOL_SOCKET;
864 cm->cmsg_type = SCM_RIGHTS;
865 }
866 #endif
867 } else {
868 control = NULL;
869 }
870
871 error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE);
872
873 bad:
874 free(to, M_SONAME);
875 return (error);
876 }
877
878 int
kern_sendit(td,s,mp,flags,control,segflg)879 kern_sendit(td, s, mp, flags, control, segflg)
880 struct thread *td;
881 int s;
882 struct msghdr *mp;
883 int flags;
884 struct mbuf *control;
885 enum uio_seg segflg;
886 {
887 struct file *fp;
888 struct uio auio;
889 struct iovec *iov;
890 struct socket *so;
891 cap_rights_t rights;
892 #ifdef KTRACE
893 struct uio *ktruio = NULL;
894 #endif
895 ssize_t len;
896 int i, error;
897
898 AUDIT_ARG_FD(s);
899 cap_rights_init(&rights, CAP_SEND);
900 if (mp->msg_name != NULL) {
901 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name);
902 cap_rights_set(&rights, CAP_CONNECT);
903 }
904 error = getsock_cap(td, s, &rights, &fp, NULL);
905 if (error != 0)
906 return (error);
907 so = (struct socket *)fp->f_data;
908
909 #ifdef KTRACE
910 if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT))
911 ktrsockaddr(mp->msg_name);
912 #endif
913 #ifdef MAC
914 if (mp->msg_name != NULL) {
915 error = mac_socket_check_connect(td->td_ucred, so,
916 mp->msg_name);
917 if (error != 0)
918 goto bad;
919 }
920 error = mac_socket_check_send(td->td_ucred, so);
921 if (error != 0)
922 goto bad;
923 #endif
924
925 auio.uio_iov = mp->msg_iov;
926 auio.uio_iovcnt = mp->msg_iovlen;
927 auio.uio_segflg = segflg;
928 auio.uio_rw = UIO_WRITE;
929 auio.uio_td = td;
930 auio.uio_offset = 0; /* XXX */
931 auio.uio_resid = 0;
932 iov = mp->msg_iov;
933 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
934 if ((auio.uio_resid += iov->iov_len) < 0) {
935 error = EINVAL;
936 goto bad;
937 }
938 }
939 #ifdef KTRACE
940 if (KTRPOINT(td, KTR_GENIO))
941 ktruio = cloneuio(&auio);
942 #endif
943 len = auio.uio_resid;
944 error = sosend(so, mp->msg_name, &auio, 0, control, flags, td);
945 if (error != 0) {
946 if (auio.uio_resid != len && (error == ERESTART ||
947 error == EINTR || error == EWOULDBLOCK))
948 error = 0;
949 /* Generation of SIGPIPE can be controlled per socket */
950 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
951 !(flags & MSG_NOSIGNAL)) {
952 PROC_LOCK(td->td_proc);
953 tdsignal(td, SIGPIPE);
954 PROC_UNLOCK(td->td_proc);
955 }
956 }
957 if (error == 0)
958 td->td_retval[0] = len - auio.uio_resid;
959 #ifdef KTRACE
960 if (ktruio != NULL) {
961 ktruio->uio_resid = td->td_retval[0];
962 ktrgenio(s, UIO_WRITE, ktruio, error);
963 }
964 #endif
965 bad:
966 fdrop(fp, td);
967 return (error);
968 }
969
970 int
sys_sendto(td,uap)971 sys_sendto(td, uap)
972 struct thread *td;
973 struct sendto_args /* {
974 int s;
975 caddr_t buf;
976 size_t len;
977 int flags;
978 caddr_t to;
979 int tolen;
980 } */ *uap;
981 {
982 struct msghdr msg;
983 struct iovec aiov;
984
985 msg.msg_name = uap->to;
986 msg.msg_namelen = uap->tolen;
987 msg.msg_iov = &aiov;
988 msg.msg_iovlen = 1;
989 msg.msg_control = 0;
990 #ifdef COMPAT_OLDSOCK
991 msg.msg_flags = 0;
992 #endif
993 aiov.iov_base = uap->buf;
994 aiov.iov_len = uap->len;
995 return (sendit(td, uap->s, &msg, uap->flags));
996 }
997
998 #ifdef COMPAT_OLDSOCK
999 int
osend(td,uap)1000 osend(td, uap)
1001 struct thread *td;
1002 struct osend_args /* {
1003 int s;
1004 caddr_t buf;
1005 int len;
1006 int flags;
1007 } */ *uap;
1008 {
1009 struct msghdr msg;
1010 struct iovec aiov;
1011
1012 msg.msg_name = 0;
1013 msg.msg_namelen = 0;
1014 msg.msg_iov = &aiov;
1015 msg.msg_iovlen = 1;
1016 aiov.iov_base = uap->buf;
1017 aiov.iov_len = uap->len;
1018 msg.msg_control = 0;
1019 msg.msg_flags = 0;
1020 return (sendit(td, uap->s, &msg, uap->flags));
1021 }
1022
1023 int
osendmsg(td,uap)1024 osendmsg(td, uap)
1025 struct thread *td;
1026 struct osendmsg_args /* {
1027 int s;
1028 caddr_t msg;
1029 int flags;
1030 } */ *uap;
1031 {
1032 struct msghdr msg;
1033 struct iovec *iov;
1034 int error;
1035
1036 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
1037 if (error != 0)
1038 return (error);
1039 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1040 if (error != 0)
1041 return (error);
1042 msg.msg_iov = iov;
1043 msg.msg_flags = MSG_COMPAT;
1044 error = sendit(td, uap->s, &msg, uap->flags);
1045 free(iov, M_IOV);
1046 return (error);
1047 }
1048 #endif
1049
1050 int
sys_sendmsg(td,uap)1051 sys_sendmsg(td, uap)
1052 struct thread *td;
1053 struct sendmsg_args /* {
1054 int s;
1055 caddr_t msg;
1056 int flags;
1057 } */ *uap;
1058 {
1059 struct msghdr msg;
1060 struct iovec *iov;
1061 int error;
1062
1063 error = copyin(uap->msg, &msg, sizeof (msg));
1064 if (error != 0)
1065 return (error);
1066 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1067 if (error != 0)
1068 return (error);
1069 msg.msg_iov = iov;
1070 #ifdef COMPAT_OLDSOCK
1071 msg.msg_flags = 0;
1072 #endif
1073 error = sendit(td, uap->s, &msg, uap->flags);
1074 free(iov, M_IOV);
1075 return (error);
1076 }
1077
1078 int
kern_recvit(td,s,mp,fromseg,controlp)1079 kern_recvit(td, s, mp, fromseg, controlp)
1080 struct thread *td;
1081 int s;
1082 struct msghdr *mp;
1083 enum uio_seg fromseg;
1084 struct mbuf **controlp;
1085 {
1086 struct uio auio;
1087 struct iovec *iov;
1088 struct mbuf *m, *control = NULL;
1089 caddr_t ctlbuf;
1090 struct file *fp;
1091 struct socket *so;
1092 struct sockaddr *fromsa = NULL;
1093 cap_rights_t rights;
1094 #ifdef KTRACE
1095 struct uio *ktruio = NULL;
1096 #endif
1097 ssize_t len;
1098 int error, i;
1099
1100 if (controlp != NULL)
1101 *controlp = NULL;
1102
1103 AUDIT_ARG_FD(s);
1104 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_RECV),
1105 &fp, NULL);
1106 if (error != 0)
1107 return (error);
1108 so = fp->f_data;
1109
1110 #ifdef MAC
1111 error = mac_socket_check_receive(td->td_ucred, so);
1112 if (error != 0) {
1113 fdrop(fp, td);
1114 return (error);
1115 }
1116 #endif
1117
1118 auio.uio_iov = mp->msg_iov;
1119 auio.uio_iovcnt = mp->msg_iovlen;
1120 auio.uio_segflg = UIO_USERSPACE;
1121 auio.uio_rw = UIO_READ;
1122 auio.uio_td = td;
1123 auio.uio_offset = 0; /* XXX */
1124 auio.uio_resid = 0;
1125 iov = mp->msg_iov;
1126 for (i = 0; i < mp->msg_iovlen; i++, iov++) {
1127 if ((auio.uio_resid += iov->iov_len) < 0) {
1128 fdrop(fp, td);
1129 return (EINVAL);
1130 }
1131 }
1132 #ifdef KTRACE
1133 if (KTRPOINT(td, KTR_GENIO))
1134 ktruio = cloneuio(&auio);
1135 #endif
1136 len = auio.uio_resid;
1137 error = soreceive(so, &fromsa, &auio, NULL,
1138 (mp->msg_control || controlp) ? &control : NULL,
1139 &mp->msg_flags);
1140 if (error != 0) {
1141 if (auio.uio_resid != len && (error == ERESTART ||
1142 error == EINTR || error == EWOULDBLOCK))
1143 error = 0;
1144 }
1145 if (fromsa != NULL)
1146 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa);
1147 #ifdef KTRACE
1148 if (ktruio != NULL) {
1149 ktruio->uio_resid = len - auio.uio_resid;
1150 ktrgenio(s, UIO_READ, ktruio, error);
1151 }
1152 #endif
1153 if (error != 0)
1154 goto out;
1155 td->td_retval[0] = len - auio.uio_resid;
1156 if (mp->msg_name) {
1157 len = mp->msg_namelen;
1158 if (len <= 0 || fromsa == NULL)
1159 len = 0;
1160 else {
1161 /* save sa_len before it is destroyed by MSG_COMPAT */
1162 len = MIN(len, fromsa->sa_len);
1163 #ifdef COMPAT_OLDSOCK
1164 if (mp->msg_flags & MSG_COMPAT)
1165 ((struct osockaddr *)fromsa)->sa_family =
1166 fromsa->sa_family;
1167 #endif
1168 if (fromseg == UIO_USERSPACE) {
1169 error = copyout(fromsa, mp->msg_name,
1170 (unsigned)len);
1171 if (error != 0)
1172 goto out;
1173 } else
1174 bcopy(fromsa, mp->msg_name, len);
1175 }
1176 mp->msg_namelen = len;
1177 }
1178 if (mp->msg_control && controlp == NULL) {
1179 #ifdef COMPAT_OLDSOCK
1180 /*
1181 * We assume that old recvmsg calls won't receive access
1182 * rights and other control info, esp. as control info
1183 * is always optional and those options didn't exist in 4.3.
1184 * If we receive rights, trim the cmsghdr; anything else
1185 * is tossed.
1186 */
1187 if (control && mp->msg_flags & MSG_COMPAT) {
1188 if (mtod(control, struct cmsghdr *)->cmsg_level !=
1189 SOL_SOCKET ||
1190 mtod(control, struct cmsghdr *)->cmsg_type !=
1191 SCM_RIGHTS) {
1192 mp->msg_controllen = 0;
1193 goto out;
1194 }
1195 control->m_len -= sizeof (struct cmsghdr);
1196 control->m_data += sizeof (struct cmsghdr);
1197 }
1198 #endif
1199 len = mp->msg_controllen;
1200 m = control;
1201 mp->msg_controllen = 0;
1202 ctlbuf = mp->msg_control;
1203
1204 while (m && len > 0) {
1205 unsigned int tocopy;
1206
1207 if (len >= m->m_len)
1208 tocopy = m->m_len;
1209 else {
1210 mp->msg_flags |= MSG_CTRUNC;
1211 tocopy = len;
1212 }
1213
1214 if ((error = copyout(mtod(m, caddr_t),
1215 ctlbuf, tocopy)) != 0)
1216 goto out;
1217
1218 ctlbuf += tocopy;
1219 len -= tocopy;
1220 m = m->m_next;
1221 }
1222 mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control;
1223 }
1224 out:
1225 fdrop(fp, td);
1226 #ifdef KTRACE
1227 if (fromsa && KTRPOINT(td, KTR_STRUCT))
1228 ktrsockaddr(fromsa);
1229 #endif
1230 free(fromsa, M_SONAME);
1231
1232 if (error == 0 && controlp != NULL)
1233 *controlp = control;
1234 else if (control)
1235 m_freem(control);
1236
1237 return (error);
1238 }
1239
1240 static int
recvit(td,s,mp,namelenp)1241 recvit(td, s, mp, namelenp)
1242 struct thread *td;
1243 int s;
1244 struct msghdr *mp;
1245 void *namelenp;
1246 {
1247 int error;
1248
1249 error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL);
1250 if (error != 0)
1251 return (error);
1252 if (namelenp != NULL) {
1253 error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t));
1254 #ifdef COMPAT_OLDSOCK
1255 if (mp->msg_flags & MSG_COMPAT)
1256 error = 0; /* old recvfrom didn't check */
1257 #endif
1258 }
1259 return (error);
1260 }
1261
1262 int
sys_recvfrom(td,uap)1263 sys_recvfrom(td, uap)
1264 struct thread *td;
1265 struct recvfrom_args /* {
1266 int s;
1267 caddr_t buf;
1268 size_t len;
1269 int flags;
1270 struct sockaddr * __restrict from;
1271 socklen_t * __restrict fromlenaddr;
1272 } */ *uap;
1273 {
1274 struct msghdr msg;
1275 struct iovec aiov;
1276 int error;
1277
1278 if (uap->fromlenaddr) {
1279 error = copyin(uap->fromlenaddr,
1280 &msg.msg_namelen, sizeof (msg.msg_namelen));
1281 if (error != 0)
1282 goto done2;
1283 } else {
1284 msg.msg_namelen = 0;
1285 }
1286 msg.msg_name = uap->from;
1287 msg.msg_iov = &aiov;
1288 msg.msg_iovlen = 1;
1289 aiov.iov_base = uap->buf;
1290 aiov.iov_len = uap->len;
1291 msg.msg_control = 0;
1292 msg.msg_flags = uap->flags;
1293 error = recvit(td, uap->s, &msg, uap->fromlenaddr);
1294 done2:
1295 return (error);
1296 }
1297
1298 #ifdef COMPAT_OLDSOCK
1299 int
orecvfrom(td,uap)1300 orecvfrom(td, uap)
1301 struct thread *td;
1302 struct recvfrom_args *uap;
1303 {
1304
1305 uap->flags |= MSG_COMPAT;
1306 return (sys_recvfrom(td, uap));
1307 }
1308 #endif
1309
1310 #ifdef COMPAT_OLDSOCK
1311 int
orecv(td,uap)1312 orecv(td, uap)
1313 struct thread *td;
1314 struct orecv_args /* {
1315 int s;
1316 caddr_t buf;
1317 int len;
1318 int flags;
1319 } */ *uap;
1320 {
1321 struct msghdr msg;
1322 struct iovec aiov;
1323
1324 msg.msg_name = 0;
1325 msg.msg_namelen = 0;
1326 msg.msg_iov = &aiov;
1327 msg.msg_iovlen = 1;
1328 aiov.iov_base = uap->buf;
1329 aiov.iov_len = uap->len;
1330 msg.msg_control = 0;
1331 msg.msg_flags = uap->flags;
1332 return (recvit(td, uap->s, &msg, NULL));
1333 }
1334
1335 /*
1336 * Old recvmsg. This code takes advantage of the fact that the old msghdr
1337 * overlays the new one, missing only the flags, and with the (old) access
1338 * rights where the control fields are now.
1339 */
1340 int
orecvmsg(td,uap)1341 orecvmsg(td, uap)
1342 struct thread *td;
1343 struct orecvmsg_args /* {
1344 int s;
1345 struct omsghdr *msg;
1346 int flags;
1347 } */ *uap;
1348 {
1349 struct msghdr msg;
1350 struct iovec *iov;
1351 int error;
1352
1353 error = copyin(uap->msg, &msg, sizeof (struct omsghdr));
1354 if (error != 0)
1355 return (error);
1356 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1357 if (error != 0)
1358 return (error);
1359 msg.msg_flags = uap->flags | MSG_COMPAT;
1360 msg.msg_iov = iov;
1361 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen);
1362 if (msg.msg_controllen && error == 0)
1363 error = copyout(&msg.msg_controllen,
1364 &uap->msg->msg_accrightslen, sizeof (int));
1365 free(iov, M_IOV);
1366 return (error);
1367 }
1368 #endif
1369
1370 int
sys_recvmsg(td,uap)1371 sys_recvmsg(td, uap)
1372 struct thread *td;
1373 struct recvmsg_args /* {
1374 int s;
1375 struct msghdr *msg;
1376 int flags;
1377 } */ *uap;
1378 {
1379 struct msghdr msg;
1380 struct iovec *uiov, *iov;
1381 int error;
1382
1383 error = copyin(uap->msg, &msg, sizeof (msg));
1384 if (error != 0)
1385 return (error);
1386 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
1387 if (error != 0)
1388 return (error);
1389 msg.msg_flags = uap->flags;
1390 #ifdef COMPAT_OLDSOCK
1391 msg.msg_flags &= ~MSG_COMPAT;
1392 #endif
1393 uiov = msg.msg_iov;
1394 msg.msg_iov = iov;
1395 error = recvit(td, uap->s, &msg, NULL);
1396 if (error == 0) {
1397 msg.msg_iov = uiov;
1398 error = copyout(&msg, uap->msg, sizeof(msg));
1399 }
1400 free(iov, M_IOV);
1401 return (error);
1402 }
1403
1404 /* ARGSUSED */
1405 int
sys_shutdown(td,uap)1406 sys_shutdown(td, uap)
1407 struct thread *td;
1408 struct shutdown_args /* {
1409 int s;
1410 int how;
1411 } */ *uap;
1412 {
1413 struct socket *so;
1414 struct file *fp;
1415 cap_rights_t rights;
1416 int error;
1417
1418 AUDIT_ARG_FD(uap->s);
1419 error = getsock_cap(td, uap->s, cap_rights_init(&rights, CAP_SHUTDOWN),
1420 &fp, NULL);
1421 if (error == 0) {
1422 so = fp->f_data;
1423 error = soshutdown(so, uap->how);
1424 fdrop(fp, td);
1425 }
1426 return (error);
1427 }
1428
1429 /* ARGSUSED */
1430 int
sys_setsockopt(td,uap)1431 sys_setsockopt(td, uap)
1432 struct thread *td;
1433 struct setsockopt_args /* {
1434 int s;
1435 int level;
1436 int name;
1437 caddr_t val;
1438 int valsize;
1439 } */ *uap;
1440 {
1441
1442 return (kern_setsockopt(td, uap->s, uap->level, uap->name,
1443 uap->val, UIO_USERSPACE, uap->valsize));
1444 }
1445
1446 int
kern_setsockopt(td,s,level,name,val,valseg,valsize)1447 kern_setsockopt(td, s, level, name, val, valseg, valsize)
1448 struct thread *td;
1449 int s;
1450 int level;
1451 int name;
1452 void *val;
1453 enum uio_seg valseg;
1454 socklen_t valsize;
1455 {
1456 struct socket *so;
1457 struct file *fp;
1458 struct sockopt sopt;
1459 cap_rights_t rights;
1460 int error;
1461
1462 if (val == NULL && valsize != 0)
1463 return (EFAULT);
1464 if ((int)valsize < 0)
1465 return (EINVAL);
1466
1467 sopt.sopt_dir = SOPT_SET;
1468 sopt.sopt_level = level;
1469 sopt.sopt_name = name;
1470 sopt.sopt_val = val;
1471 sopt.sopt_valsize = valsize;
1472 switch (valseg) {
1473 case UIO_USERSPACE:
1474 sopt.sopt_td = td;
1475 break;
1476 case UIO_SYSSPACE:
1477 sopt.sopt_td = NULL;
1478 break;
1479 default:
1480 panic("kern_setsockopt called with bad valseg");
1481 }
1482
1483 AUDIT_ARG_FD(s);
1484 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SETSOCKOPT),
1485 &fp, NULL);
1486 if (error == 0) {
1487 so = fp->f_data;
1488 error = sosetopt(so, &sopt);
1489 fdrop(fp, td);
1490 }
1491 return(error);
1492 }
1493
1494 /* ARGSUSED */
1495 int
sys_getsockopt(td,uap)1496 sys_getsockopt(td, uap)
1497 struct thread *td;
1498 struct getsockopt_args /* {
1499 int s;
1500 int level;
1501 int name;
1502 void * __restrict val;
1503 socklen_t * __restrict avalsize;
1504 } */ *uap;
1505 {
1506 socklen_t valsize;
1507 int error;
1508
1509 if (uap->val) {
1510 error = copyin(uap->avalsize, &valsize, sizeof (valsize));
1511 if (error != 0)
1512 return (error);
1513 }
1514
1515 error = kern_getsockopt(td, uap->s, uap->level, uap->name,
1516 uap->val, UIO_USERSPACE, &valsize);
1517
1518 if (error == 0)
1519 error = copyout(&valsize, uap->avalsize, sizeof (valsize));
1520 return (error);
1521 }
1522
1523 /*
1524 * Kernel version of getsockopt.
1525 * optval can be a userland or userspace. optlen is always a kernel pointer.
1526 */
1527 int
kern_getsockopt(td,s,level,name,val,valseg,valsize)1528 kern_getsockopt(td, s, level, name, val, valseg, valsize)
1529 struct thread *td;
1530 int s;
1531 int level;
1532 int name;
1533 void *val;
1534 enum uio_seg valseg;
1535 socklen_t *valsize;
1536 {
1537 struct socket *so;
1538 struct file *fp;
1539 struct sockopt sopt;
1540 cap_rights_t rights;
1541 int error;
1542
1543 if (val == NULL)
1544 *valsize = 0;
1545 if ((int)*valsize < 0)
1546 return (EINVAL);
1547
1548 sopt.sopt_dir = SOPT_GET;
1549 sopt.sopt_level = level;
1550 sopt.sopt_name = name;
1551 sopt.sopt_val = val;
1552 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */
1553 switch (valseg) {
1554 case UIO_USERSPACE:
1555 sopt.sopt_td = td;
1556 break;
1557 case UIO_SYSSPACE:
1558 sopt.sopt_td = NULL;
1559 break;
1560 default:
1561 panic("kern_getsockopt called with bad valseg");
1562 }
1563
1564 AUDIT_ARG_FD(s);
1565 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_GETSOCKOPT),
1566 &fp, NULL);
1567 if (error == 0) {
1568 so = fp->f_data;
1569 error = sogetopt(so, &sopt);
1570 *valsize = sopt.sopt_valsize;
1571 fdrop(fp, td);
1572 }
1573 return (error);
1574 }
1575
1576 /*
1577 * getsockname1() - Get socket name.
1578 */
1579 /* ARGSUSED */
1580 static int
getsockname1(td,uap,compat)1581 getsockname1(td, uap, compat)
1582 struct thread *td;
1583 struct getsockname_args /* {
1584 int fdes;
1585 struct sockaddr * __restrict asa;
1586 socklen_t * __restrict alen;
1587 } */ *uap;
1588 int compat;
1589 {
1590 struct sockaddr *sa;
1591 socklen_t len;
1592 int error;
1593
1594 error = copyin(uap->alen, &len, sizeof(len));
1595 if (error != 0)
1596 return (error);
1597
1598 error = kern_getsockname(td, uap->fdes, &sa, &len);
1599 if (error != 0)
1600 return (error);
1601
1602 if (len != 0) {
1603 #ifdef COMPAT_OLDSOCK
1604 if (compat)
1605 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1606 #endif
1607 error = copyout(sa, uap->asa, (u_int)len);
1608 }
1609 free(sa, M_SONAME);
1610 if (error == 0)
1611 error = copyout(&len, uap->alen, sizeof(len));
1612 return (error);
1613 }
1614
1615 int
kern_getsockname(struct thread * td,int fd,struct sockaddr ** sa,socklen_t * alen)1616 kern_getsockname(struct thread *td, int fd, struct sockaddr **sa,
1617 socklen_t *alen)
1618 {
1619 struct socket *so;
1620 struct file *fp;
1621 cap_rights_t rights;
1622 socklen_t len;
1623 int error;
1624
1625 AUDIT_ARG_FD(fd);
1626 error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_GETSOCKNAME),
1627 &fp, NULL);
1628 if (error != 0)
1629 return (error);
1630 so = fp->f_data;
1631 *sa = NULL;
1632 CURVNET_SET(so->so_vnet);
1633 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa);
1634 CURVNET_RESTORE();
1635 if (error != 0)
1636 goto bad;
1637 if (*sa == NULL)
1638 len = 0;
1639 else
1640 len = MIN(*alen, (*sa)->sa_len);
1641 *alen = len;
1642 #ifdef KTRACE
1643 if (KTRPOINT(td, KTR_STRUCT))
1644 ktrsockaddr(*sa);
1645 #endif
1646 bad:
1647 fdrop(fp, td);
1648 if (error != 0 && *sa != NULL) {
1649 free(*sa, M_SONAME);
1650 *sa = NULL;
1651 }
1652 return (error);
1653 }
1654
1655 int
sys_getsockname(td,uap)1656 sys_getsockname(td, uap)
1657 struct thread *td;
1658 struct getsockname_args *uap;
1659 {
1660
1661 return (getsockname1(td, uap, 0));
1662 }
1663
1664 #ifdef COMPAT_OLDSOCK
1665 int
ogetsockname(td,uap)1666 ogetsockname(td, uap)
1667 struct thread *td;
1668 struct getsockname_args *uap;
1669 {
1670
1671 return (getsockname1(td, uap, 1));
1672 }
1673 #endif /* COMPAT_OLDSOCK */
1674
1675 /*
1676 * getpeername1() - Get name of peer for connected socket.
1677 */
1678 /* ARGSUSED */
1679 static int
getpeername1(td,uap,compat)1680 getpeername1(td, uap, compat)
1681 struct thread *td;
1682 struct getpeername_args /* {
1683 int fdes;
1684 struct sockaddr * __restrict asa;
1685 socklen_t * __restrict alen;
1686 } */ *uap;
1687 int compat;
1688 {
1689 struct sockaddr *sa;
1690 socklen_t len;
1691 int error;
1692
1693 error = copyin(uap->alen, &len, sizeof (len));
1694 if (error != 0)
1695 return (error);
1696
1697 error = kern_getpeername(td, uap->fdes, &sa, &len);
1698 if (error != 0)
1699 return (error);
1700
1701 if (len != 0) {
1702 #ifdef COMPAT_OLDSOCK
1703 if (compat)
1704 ((struct osockaddr *)sa)->sa_family = sa->sa_family;
1705 #endif
1706 error = copyout(sa, uap->asa, (u_int)len);
1707 }
1708 free(sa, M_SONAME);
1709 if (error == 0)
1710 error = copyout(&len, uap->alen, sizeof(len));
1711 return (error);
1712 }
1713
1714 int
kern_getpeername(struct thread * td,int fd,struct sockaddr ** sa,socklen_t * alen)1715 kern_getpeername(struct thread *td, int fd, struct sockaddr **sa,
1716 socklen_t *alen)
1717 {
1718 struct socket *so;
1719 struct file *fp;
1720 cap_rights_t rights;
1721 socklen_t len;
1722 int error;
1723
1724 AUDIT_ARG_FD(fd);
1725 error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_GETPEERNAME),
1726 &fp, NULL);
1727 if (error != 0)
1728 return (error);
1729 so = fp->f_data;
1730 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
1731 error = ENOTCONN;
1732 goto done;
1733 }
1734 *sa = NULL;
1735 CURVNET_SET(so->so_vnet);
1736 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa);
1737 CURVNET_RESTORE();
1738 if (error != 0)
1739 goto bad;
1740 if (*sa == NULL)
1741 len = 0;
1742 else
1743 len = MIN(*alen, (*sa)->sa_len);
1744 *alen = len;
1745 #ifdef KTRACE
1746 if (KTRPOINT(td, KTR_STRUCT))
1747 ktrsockaddr(*sa);
1748 #endif
1749 bad:
1750 if (error != 0 && *sa != NULL) {
1751 free(*sa, M_SONAME);
1752 *sa = NULL;
1753 }
1754 done:
1755 fdrop(fp, td);
1756 return (error);
1757 }
1758
1759 int
sys_getpeername(td,uap)1760 sys_getpeername(td, uap)
1761 struct thread *td;
1762 struct getpeername_args *uap;
1763 {
1764
1765 return (getpeername1(td, uap, 0));
1766 }
1767
1768 #ifdef COMPAT_OLDSOCK
1769 int
ogetpeername(td,uap)1770 ogetpeername(td, uap)
1771 struct thread *td;
1772 struct ogetpeername_args *uap;
1773 {
1774
1775 /* XXX uap should have type `getpeername_args *' to begin with. */
1776 return (getpeername1(td, (struct getpeername_args *)uap, 1));
1777 }
1778 #endif /* COMPAT_OLDSOCK */
1779
1780 int
sockargs(mp,buf,buflen,type)1781 sockargs(mp, buf, buflen, type)
1782 struct mbuf **mp;
1783 caddr_t buf;
1784 int buflen, type;
1785 {
1786 struct sockaddr *sa;
1787 struct mbuf *m;
1788 int error;
1789
1790 if (buflen < 0)
1791 return (EINVAL);
1792
1793 if (buflen > MLEN) {
1794 #ifdef COMPAT_OLDSOCK
1795 if (type == MT_SONAME && buflen <= 112)
1796 buflen = MLEN; /* unix domain compat. hack */
1797 else
1798 #endif
1799 if (buflen > MCLBYTES)
1800 return (EINVAL);
1801 }
1802 m = m_get2(buflen, M_WAITOK, type, 0);
1803 m->m_len = buflen;
1804 error = copyin(buf, mtod(m, caddr_t), (u_int)buflen);
1805 if (error != 0)
1806 (void) m_free(m);
1807 else {
1808 *mp = m;
1809 if (type == MT_SONAME) {
1810 sa = mtod(m, struct sockaddr *);
1811
1812 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1813 if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
1814 sa->sa_family = sa->sa_len;
1815 #endif
1816 sa->sa_len = buflen;
1817 }
1818 }
1819 return (error);
1820 }
1821
1822 int
getsockaddr(namp,uaddr,len)1823 getsockaddr(namp, uaddr, len)
1824 struct sockaddr **namp;
1825 caddr_t uaddr;
1826 size_t len;
1827 {
1828 struct sockaddr *sa;
1829 int error;
1830
1831 if (len > SOCK_MAXADDRLEN)
1832 return (ENAMETOOLONG);
1833 if (len < offsetof(struct sockaddr, sa_data[0]))
1834 return (EINVAL);
1835 sa = malloc(len, M_SONAME, M_WAITOK);
1836 error = copyin(uaddr, sa, len);
1837 if (error != 0) {
1838 free(sa, M_SONAME);
1839 } else {
1840 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN
1841 if (sa->sa_family == 0 && sa->sa_len < AF_MAX)
1842 sa->sa_family = sa->sa_len;
1843 #endif
1844 sa->sa_len = len;
1845 *namp = sa;
1846 }
1847 return (error);
1848 }
1849
1850 struct sendfile_sync {
1851 struct mtx mtx;
1852 struct cv cv;
1853 unsigned count;
1854 };
1855
1856 /*
1857 * Detach mapped page and release resources back to the system.
1858 */
1859 int
sf_buf_mext(struct mbuf * mb,void * addr,void * args)1860 sf_buf_mext(struct mbuf *mb, void *addr, void *args)
1861 {
1862 vm_page_t m;
1863 struct sendfile_sync *sfs;
1864
1865 m = sf_buf_page(args);
1866 sf_buf_free(args);
1867 vm_page_lock(m);
1868 vm_page_unwire(m, 0);
1869 /*
1870 * Check for the object going away on us. This can
1871 * happen since we don't hold a reference to it.
1872 * If so, we're responsible for freeing the page.
1873 */
1874 if (m->wire_count == 0 && m->object == NULL)
1875 vm_page_free(m);
1876 vm_page_unlock(m);
1877 if (addr == NULL)
1878 return (EXT_FREE_OK);
1879 sfs = addr;
1880 mtx_lock(&sfs->mtx);
1881 KASSERT(sfs->count> 0, ("Sendfile sync botchup count == 0"));
1882 if (--sfs->count == 0)
1883 cv_signal(&sfs->cv);
1884 mtx_unlock(&sfs->mtx);
1885 return (EXT_FREE_OK);
1886 }
1887
1888 /*
1889 * sendfile(2)
1890 *
1891 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1892 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1893 *
1894 * Send a file specified by 'fd' and starting at 'offset' to a socket
1895 * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
1896 * 0. Optionally add a header and/or trailer to the socket output. If
1897 * specified, write the total number of bytes sent into *sbytes.
1898 */
1899 int
sys_sendfile(struct thread * td,struct sendfile_args * uap)1900 sys_sendfile(struct thread *td, struct sendfile_args *uap)
1901 {
1902
1903 return (do_sendfile(td, uap, 0));
1904 }
1905
1906 static int
do_sendfile(struct thread * td,struct sendfile_args * uap,int compat)1907 do_sendfile(struct thread *td, struct sendfile_args *uap, int compat)
1908 {
1909 struct sf_hdtr hdtr;
1910 struct uio *hdr_uio, *trl_uio;
1911 struct file *fp;
1912 cap_rights_t rights;
1913 int error;
1914
1915 /*
1916 * File offset must be positive. If it goes beyond EOF
1917 * we send only the header/trailer and no payload data.
1918 */
1919 if (uap->offset < 0)
1920 return (EINVAL);
1921
1922 hdr_uio = trl_uio = NULL;
1923
1924 if (uap->hdtr != NULL) {
1925 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
1926 if (error != 0)
1927 goto out;
1928 if (hdtr.headers != NULL) {
1929 error = copyinuio(hdtr.headers, hdtr.hdr_cnt, &hdr_uio);
1930 if (error != 0)
1931 goto out;
1932 }
1933 if (hdtr.trailers != NULL) {
1934 error = copyinuio(hdtr.trailers, hdtr.trl_cnt, &trl_uio);
1935 if (error != 0)
1936 goto out;
1937
1938 }
1939 }
1940
1941 AUDIT_ARG_FD(uap->fd);
1942
1943 /*
1944 * sendfile(2) can start at any offset within a file so we require
1945 * CAP_READ+CAP_SEEK = CAP_PREAD.
1946 */
1947 if ((error = fget_read(td, uap->fd,
1948 cap_rights_init(&rights, CAP_PREAD), &fp)) != 0) {
1949 goto out;
1950 }
1951
1952 error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
1953 uap->nbytes, uap->sbytes, uap->flags, compat ? SFK_COMPAT : 0, td);
1954 fdrop(fp, td);
1955
1956 out:
1957 free(hdr_uio, M_IOV);
1958 free(trl_uio, M_IOV);
1959 return (error);
1960 }
1961
1962 #ifdef COMPAT_FREEBSD4
1963 int
freebsd4_sendfile(struct thread * td,struct freebsd4_sendfile_args * uap)1964 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
1965 {
1966 struct sendfile_args args;
1967
1968 args.fd = uap->fd;
1969 args.s = uap->s;
1970 args.offset = uap->offset;
1971 args.nbytes = uap->nbytes;
1972 args.hdtr = uap->hdtr;
1973 args.sbytes = uap->sbytes;
1974 args.flags = uap->flags;
1975
1976 return (do_sendfile(td, &args, 1));
1977 }
1978 #endif /* COMPAT_FREEBSD4 */
1979
1980 static int
sendfile_readpage(vm_object_t obj,struct vnode * vp,int nd,off_t off,int xfsize,int bsize,struct thread * td,vm_page_t * res)1981 sendfile_readpage(vm_object_t obj, struct vnode *vp, int nd,
1982 off_t off, int xfsize, int bsize, struct thread *td, vm_page_t *res)
1983 {
1984 vm_page_t m;
1985 vm_pindex_t pindex;
1986 ssize_t resid;
1987 int error, readahead, rv;
1988
1989 pindex = OFF_TO_IDX(off);
1990 VM_OBJECT_WLOCK(obj);
1991 m = vm_page_grab(obj, pindex, (vp != NULL ? VM_ALLOC_NOBUSY |
1992 VM_ALLOC_IGN_SBUSY : 0) | VM_ALLOC_WIRED | VM_ALLOC_NORMAL);
1993
1994 /*
1995 * Check if page is valid for what we need, otherwise initiate I/O.
1996 *
1997 * The non-zero nd argument prevents disk I/O, instead we
1998 * return the caller what he specified in nd. In particular,
1999 * if we already turned some pages into mbufs, nd == EAGAIN
2000 * and the main function send them the pages before we come
2001 * here again and block.
2002 */
2003 if (m->valid != 0 && vm_page_is_valid(m, off & PAGE_MASK, xfsize)) {
2004 if (vp == NULL)
2005 vm_page_xunbusy(m);
2006 VM_OBJECT_WUNLOCK(obj);
2007 *res = m;
2008 return (0);
2009 } else if (nd != 0) {
2010 if (vp == NULL)
2011 vm_page_xunbusy(m);
2012 error = nd;
2013 goto free_page;
2014 }
2015
2016 /*
2017 * Get the page from backing store.
2018 */
2019 error = 0;
2020 if (vp != NULL) {
2021 VM_OBJECT_WUNLOCK(obj);
2022 readahead = sfreadahead * MAXBSIZE;
2023
2024 /*
2025 * Use vn_rdwr() instead of the pager interface for
2026 * the vnode, to allow the read-ahead.
2027 *
2028 * XXXMAC: Because we don't have fp->f_cred here, we
2029 * pass in NOCRED. This is probably wrong, but is
2030 * consistent with our original implementation.
2031 */
2032 error = vn_rdwr(UIO_READ, vp, NULL, readahead, trunc_page(off),
2033 UIO_NOCOPY, IO_NODELOCKED | IO_VMIO | ((readahead /
2034 bsize) << IO_SEQSHIFT), td->td_ucred, NOCRED, &resid, td);
2035 SFSTAT_INC(sf_iocnt);
2036 VM_OBJECT_WLOCK(obj);
2037 } else {
2038 if (vm_pager_has_page(obj, pindex, NULL, NULL)) {
2039 rv = vm_pager_get_pages(obj, &m, 1, 0);
2040 SFSTAT_INC(sf_iocnt);
2041 m = vm_page_lookup(obj, pindex);
2042 if (m == NULL)
2043 error = EIO;
2044 else if (rv != VM_PAGER_OK) {
2045 vm_page_lock(m);
2046 vm_page_free(m);
2047 vm_page_unlock(m);
2048 m = NULL;
2049 error = EIO;
2050 }
2051 } else {
2052 pmap_zero_page(m);
2053 m->valid = VM_PAGE_BITS_ALL;
2054 m->dirty = 0;
2055 }
2056 if (m != NULL)
2057 vm_page_xunbusy(m);
2058 }
2059 if (error == 0) {
2060 *res = m;
2061 } else if (m != NULL) {
2062 free_page:
2063 vm_page_lock(m);
2064 vm_page_unwire(m, 0);
2065
2066 /*
2067 * See if anyone else might know about this page. If
2068 * not and it is not valid, then free it.
2069 */
2070 if (m->wire_count == 0 && m->valid == 0 && !vm_page_busied(m))
2071 vm_page_free(m);
2072 vm_page_unlock(m);
2073 }
2074 KASSERT(error != 0 || (m->wire_count > 0 &&
2075 vm_page_is_valid(m, off & PAGE_MASK, xfsize)),
2076 ("wrong page state m %p off %#jx xfsize %d", m, (uintmax_t)off,
2077 xfsize));
2078 VM_OBJECT_WUNLOCK(obj);
2079 return (error);
2080 }
2081
2082 static int
sendfile_getobj(struct thread * td,struct file * fp,vm_object_t * obj_res,struct vnode ** vp_res,struct shmfd ** shmfd_res,off_t * obj_size,int * bsize)2083 sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
2084 struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
2085 int *bsize)
2086 {
2087 struct vattr va;
2088 vm_object_t obj;
2089 struct vnode *vp;
2090 struct shmfd *shmfd;
2091 int error;
2092
2093 vp = *vp_res = NULL;
2094 obj = NULL;
2095 shmfd = *shmfd_res = NULL;
2096 *bsize = 0;
2097
2098 /*
2099 * The file descriptor must be a regular file and have a
2100 * backing VM object.
2101 */
2102 if (fp->f_type == DTYPE_VNODE) {
2103 vp = fp->f_vnode;
2104 vn_lock(vp, LK_SHARED | LK_RETRY);
2105 if (vp->v_type != VREG) {
2106 error = EINVAL;
2107 goto out;
2108 }
2109 *bsize = vp->v_mount->mnt_stat.f_iosize;
2110 error = VOP_GETATTR(vp, &va, td->td_ucred);
2111 if (error != 0)
2112 goto out;
2113 *obj_size = va.va_size;
2114 obj = vp->v_object;
2115 if (obj == NULL) {
2116 error = EINVAL;
2117 goto out;
2118 }
2119 } else if (fp->f_type == DTYPE_SHM) {
2120 error = 0;
2121 shmfd = fp->f_data;
2122 obj = shmfd->shm_object;
2123 *obj_size = shmfd->shm_size;
2124 } else {
2125 error = EINVAL;
2126 goto out;
2127 }
2128
2129 VM_OBJECT_WLOCK(obj);
2130 if ((obj->flags & OBJ_DEAD) != 0) {
2131 VM_OBJECT_WUNLOCK(obj);
2132 error = EBADF;
2133 goto out;
2134 }
2135
2136 /*
2137 * Temporarily increase the backing VM object's reference
2138 * count so that a forced reclamation of its vnode does not
2139 * immediately destroy it.
2140 */
2141 vm_object_reference_locked(obj);
2142 VM_OBJECT_WUNLOCK(obj);
2143 *obj_res = obj;
2144 *vp_res = vp;
2145 *shmfd_res = shmfd;
2146
2147 out:
2148 if (vp != NULL)
2149 VOP_UNLOCK(vp, 0);
2150 return (error);
2151 }
2152
2153 static int
kern_sendfile_getsock(struct thread * td,int s,struct file ** sock_fp,struct socket ** so)2154 kern_sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
2155 struct socket **so)
2156 {
2157 cap_rights_t rights;
2158 int error;
2159
2160 *sock_fp = NULL;
2161 *so = NULL;
2162
2163 /*
2164 * The socket must be a stream socket and connected.
2165 */
2166 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SEND),
2167 sock_fp, NULL);
2168 if (error != 0)
2169 return (error);
2170 *so = (*sock_fp)->f_data;
2171 if ((*so)->so_type != SOCK_STREAM)
2172 return (EINVAL);
2173 if (((*so)->so_state & SS_ISCONNECTED) == 0)
2174 return (ENOTCONN);
2175 return (0);
2176 }
2177
2178 int
vn_sendfile(struct file * fp,int sockfd,struct uio * hdr_uio,struct uio * trl_uio,off_t offset,size_t nbytes,off_t * sent,int flags,int kflags,struct thread * td)2179 vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
2180 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
2181 int kflags, struct thread *td)
2182 {
2183 struct file *sock_fp;
2184 struct vnode *vp;
2185 struct vm_object *obj;
2186 struct socket *so;
2187 struct mbuf *m;
2188 struct sf_buf *sf;
2189 struct vm_page *pg;
2190 struct shmfd *shmfd;
2191 struct sendfile_sync *sfs;
2192 struct vattr va;
2193 off_t off, xfsize, fsbytes, sbytes, rem, obj_size;
2194 int error, bsize, nd, hdrlen, mnw;
2195 bool inflight_called;
2196
2197 pg = NULL;
2198 obj = NULL;
2199 so = NULL;
2200 m = NULL;
2201 sfs = NULL;
2202 fsbytes = sbytes = 0;
2203 hdrlen = mnw = 0;
2204 rem = nbytes;
2205 obj_size = 0;
2206 inflight_called = false;
2207
2208 error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
2209 if (error != 0)
2210 return (error);
2211 if (rem == 0)
2212 rem = obj_size;
2213
2214 error = kern_sendfile_getsock(td, sockfd, &sock_fp, &so);
2215 if (error != 0)
2216 goto out;
2217
2218 /*
2219 * Do not wait on memory allocations but return ENOMEM for
2220 * caller to retry later.
2221 * XXX: Experimental.
2222 */
2223 if (flags & SF_MNOWAIT)
2224 mnw = 1;
2225
2226 if (flags & SF_SYNC) {
2227 sfs = malloc(sizeof *sfs, M_TEMP, M_WAITOK | M_ZERO);
2228 mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
2229 cv_init(&sfs->cv, "sendfile");
2230 }
2231
2232 #ifdef MAC
2233 error = mac_socket_check_send(td->td_ucred, so);
2234 if (error != 0)
2235 goto out;
2236 #endif
2237
2238 /* If headers are specified copy them into mbufs. */
2239 if (hdr_uio != NULL) {
2240 hdr_uio->uio_td = td;
2241 hdr_uio->uio_rw = UIO_WRITE;
2242 if (hdr_uio->uio_resid > 0) {
2243 /*
2244 * In FBSD < 5.0 the nbytes to send also included
2245 * the header. If compat is specified subtract the
2246 * header size from nbytes.
2247 */
2248 if (kflags & SFK_COMPAT) {
2249 if (nbytes > hdr_uio->uio_resid)
2250 nbytes -= hdr_uio->uio_resid;
2251 else
2252 nbytes = 0;
2253 }
2254 m = m_uiotombuf(hdr_uio, (mnw ? M_NOWAIT : M_WAITOK),
2255 0, 0, 0);
2256 if (m == NULL) {
2257 error = mnw ? EAGAIN : ENOBUFS;
2258 goto out;
2259 }
2260 hdrlen = m_length(m, NULL);
2261 }
2262 }
2263
2264 /*
2265 * Protect against multiple writers to the socket.
2266 *
2267 * XXXRW: Historically this has assumed non-interruptibility, so now
2268 * we implement that, but possibly shouldn't.
2269 */
2270 (void)sblock(&so->so_snd, SBL_WAIT | SBL_NOINTR);
2271
2272 /*
2273 * Loop through the pages of the file, starting with the requested
2274 * offset. Get a file page (do I/O if necessary), map the file page
2275 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
2276 * it on the socket.
2277 * This is done in two loops. The inner loop turns as many pages
2278 * as it can, up to available socket buffer space, without blocking
2279 * into mbufs to have it bulk delivered into the socket send buffer.
2280 * The outer loop checks the state and available space of the socket
2281 * and takes care of the overall progress.
2282 */
2283 for (off = offset; ; ) {
2284 struct mbuf *mtail;
2285 int loopbytes;
2286 int space;
2287 int done;
2288
2289 if ((nbytes != 0 && nbytes == fsbytes) ||
2290 (nbytes == 0 && obj_size == fsbytes))
2291 break;
2292
2293 mtail = NULL;
2294 loopbytes = 0;
2295 space = 0;
2296 done = 0;
2297
2298 /*
2299 * Check the socket state for ongoing connection,
2300 * no errors and space in socket buffer.
2301 * If space is low allow for the remainder of the
2302 * file to be processed if it fits the socket buffer.
2303 * Otherwise block in waiting for sufficient space
2304 * to proceed, or if the socket is nonblocking, return
2305 * to userland with EAGAIN while reporting how far
2306 * we've come.
2307 * We wait until the socket buffer has significant free
2308 * space to do bulk sends. This makes good use of file
2309 * system read ahead and allows packet segmentation
2310 * offloading hardware to take over lots of work. If
2311 * we were not careful here we would send off only one
2312 * sfbuf at a time.
2313 */
2314 SOCKBUF_LOCK(&so->so_snd);
2315 if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
2316 so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
2317 retry_space:
2318 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
2319 error = EPIPE;
2320 SOCKBUF_UNLOCK(&so->so_snd);
2321 goto done;
2322 } else if (so->so_error) {
2323 error = so->so_error;
2324 so->so_error = 0;
2325 SOCKBUF_UNLOCK(&so->so_snd);
2326 goto done;
2327 }
2328 space = sbspace(&so->so_snd);
2329 if (space < rem &&
2330 (space <= 0 ||
2331 space < so->so_snd.sb_lowat)) {
2332 if (so->so_state & SS_NBIO) {
2333 SOCKBUF_UNLOCK(&so->so_snd);
2334 error = EAGAIN;
2335 goto done;
2336 }
2337 /*
2338 * sbwait drops the lock while sleeping.
2339 * When we loop back to retry_space the
2340 * state may have changed and we retest
2341 * for it.
2342 */
2343 error = sbwait(&so->so_snd);
2344 /*
2345 * An error from sbwait usually indicates that we've
2346 * been interrupted by a signal. If we've sent anything
2347 * then return bytes sent, otherwise return the error.
2348 */
2349 if (error != 0) {
2350 SOCKBUF_UNLOCK(&so->so_snd);
2351 goto done;
2352 }
2353 goto retry_space;
2354 }
2355 SOCKBUF_UNLOCK(&so->so_snd);
2356
2357 /*
2358 * Reduce space in the socket buffer by the size of
2359 * the header mbuf chain.
2360 * hdrlen is set to 0 after the first loop.
2361 */
2362 space -= hdrlen;
2363
2364 if (vp != NULL) {
2365 error = vn_lock(vp, LK_SHARED);
2366 if (error != 0)
2367 goto done;
2368 error = VOP_GETATTR(vp, &va, td->td_ucred);
2369 if (error != 0 || off >= va.va_size) {
2370 VOP_UNLOCK(vp, 0);
2371 goto done;
2372 }
2373 obj_size = va.va_size;
2374 }
2375
2376 /*
2377 * Loop and construct maximum sized mbuf chain to be bulk
2378 * dumped into socket buffer.
2379 */
2380 while (space > loopbytes) {
2381 vm_offset_t pgoff;
2382 struct mbuf *m0;
2383
2384 /*
2385 * Calculate the amount to transfer.
2386 * Not to exceed a page, the EOF,
2387 * or the passed in nbytes.
2388 */
2389 pgoff = (vm_offset_t)(off & PAGE_MASK);
2390 rem = obj_size - offset;
2391 if (nbytes != 0)
2392 rem = omin(rem, nbytes);
2393 rem -= fsbytes + loopbytes;
2394 xfsize = omin(PAGE_SIZE - pgoff, rem);
2395 xfsize = omin(space - loopbytes, xfsize);
2396 if (xfsize <= 0) {
2397 done = 1; /* all data sent */
2398 break;
2399 }
2400
2401 /*
2402 * Attempt to look up the page. Allocate
2403 * if not found or wait and loop if busy.
2404 */
2405 if (m != NULL)
2406 nd = EAGAIN; /* send what we already got */
2407 else if ((flags & SF_NODISKIO) != 0)
2408 nd = EBUSY;
2409 else
2410 nd = 0;
2411 error = sendfile_readpage(obj, vp, nd, off,
2412 xfsize, bsize, td, &pg);
2413 if (error != 0) {
2414 if (error == EAGAIN)
2415 error = 0; /* not a real error */
2416 break;
2417 }
2418
2419 /*
2420 * Get a sendfile buf. When allocating the
2421 * first buffer for mbuf chain, we usually
2422 * wait as long as necessary, but this wait
2423 * can be interrupted. For consequent
2424 * buffers, do not sleep, since several
2425 * threads might exhaust the buffers and then
2426 * deadlock.
2427 */
2428 sf = sf_buf_alloc(pg, (mnw || m != NULL) ? SFB_NOWAIT :
2429 SFB_CATCH);
2430 if (sf == NULL) {
2431 SFSTAT_INC(sf_allocfail);
2432 vm_page_lock(pg);
2433 vm_page_unwire(pg, 0);
2434 KASSERT(pg->object != NULL,
2435 ("%s: object disappeared", __func__));
2436 vm_page_unlock(pg);
2437 if (m == NULL)
2438 error = (mnw ? EAGAIN : EINTR);
2439 break;
2440 }
2441
2442 /*
2443 * Get an mbuf and set it up as having
2444 * external storage.
2445 */
2446 m0 = m_get((mnw ? M_NOWAIT : M_WAITOK), MT_DATA);
2447 if (m0 == NULL) {
2448 error = (mnw ? EAGAIN : ENOBUFS);
2449 (void)sf_buf_mext(NULL, NULL, sf);
2450 break;
2451 }
2452 if (m_extadd(m0, (caddr_t )sf_buf_kva(sf), PAGE_SIZE,
2453 sf_buf_mext, sfs, sf, M_RDONLY, EXT_SFBUF,
2454 (mnw ? M_NOWAIT : M_WAITOK)) != 0) {
2455 error = (mnw ? EAGAIN : ENOBUFS);
2456 (void)sf_buf_mext(NULL, NULL, sf);
2457 m_freem(m0);
2458 break;
2459 }
2460 m0->m_data = (char *)sf_buf_kva(sf) + pgoff;
2461 m0->m_len = xfsize;
2462
2463 /* Append to mbuf chain. */
2464 if (mtail != NULL)
2465 mtail->m_next = m0;
2466 else if (m != NULL)
2467 m_last(m)->m_next = m0;
2468 else
2469 m = m0;
2470 mtail = m0;
2471
2472 /* Keep track of bits processed. */
2473 loopbytes += xfsize;
2474 off += xfsize;
2475
2476 if (sfs != NULL) {
2477 mtx_lock(&sfs->mtx);
2478 sfs->count++;
2479 mtx_unlock(&sfs->mtx);
2480 }
2481 }
2482
2483 if (vp != NULL)
2484 VOP_UNLOCK(vp, 0);
2485
2486 /* Add the buffer chain to the socket buffer. */
2487 if (m != NULL) {
2488 int mlen, err;
2489
2490 mlen = m_length(m, NULL);
2491 SOCKBUF_LOCK(&so->so_snd);
2492 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
2493 error = EPIPE;
2494 SOCKBUF_UNLOCK(&so->so_snd);
2495 goto done;
2496 }
2497 SOCKBUF_UNLOCK(&so->so_snd);
2498 CURVNET_SET(so->so_vnet);
2499 /* Avoid error aliasing. */
2500 err = (*so->so_proto->pr_usrreqs->pru_send)
2501 (so, 0, m, NULL, NULL, td);
2502 CURVNET_RESTORE();
2503 if (err == 0) {
2504 /*
2505 * We need two counters to get the
2506 * file offset and nbytes to send
2507 * right:
2508 * - sbytes contains the total amount
2509 * of bytes sent, including headers.
2510 * - fsbytes contains the total amount
2511 * of bytes sent from the file.
2512 */
2513 sbytes += mlen;
2514 fsbytes += mlen;
2515 if (hdrlen) {
2516 fsbytes -= hdrlen;
2517 hdrlen = 0;
2518 }
2519 } else if (error == 0)
2520 error = err;
2521 m = NULL; /* pru_send always consumes */
2522 }
2523
2524 /* Quit outer loop on error or when we're done. */
2525 if (done)
2526 break;
2527 if (error != 0)
2528 goto done;
2529 }
2530
2531 /*
2532 * Send trailers. Wimp out and use writev(2).
2533 */
2534 if (trl_uio != NULL) {
2535 sbunlock(&so->so_snd);
2536 error = kern_writev(td, sockfd, trl_uio);
2537 if (error == 0)
2538 sbytes += td->td_retval[0];
2539 goto out;
2540 }
2541
2542 done:
2543 sbunlock(&so->so_snd);
2544 out:
2545 /*
2546 * If there was no error we have to clear td->td_retval[0]
2547 * because it may have been set by writev.
2548 */
2549 if (error == 0) {
2550 td->td_retval[0] = 0;
2551 }
2552 if (sent != NULL) {
2553 copyout(&sbytes, sent, sizeof(off_t));
2554 }
2555 if (obj != NULL)
2556 vm_object_deallocate(obj);
2557 if (so)
2558 fdrop(sock_fp, td);
2559 if (m)
2560 m_freem(m);
2561
2562 if (sfs != NULL) {
2563 mtx_lock(&sfs->mtx);
2564 if (sfs->count != 0)
2565 cv_wait(&sfs->cv, &sfs->mtx);
2566 KASSERT(sfs->count == 0, ("sendfile sync still busy"));
2567 cv_destroy(&sfs->cv);
2568 mtx_destroy(&sfs->mtx);
2569 free(sfs, M_TEMP);
2570 }
2571
2572 if (error == ERESTART)
2573 error = EINTR;
2574
2575 return (error);
2576 }
2577