1 /*-
2 * Copyright (c) 2013-2015 Gleb Smirnoff <glebius@FreeBSD.org>
3 * Copyright (c) 1998, David Greenman. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #include "opt_kern_tls.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/capsicum.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/ktls.h>
39 #include <sys/mutex.h>
40 #include <sys/malloc.h>
41 #include <sys/mman.h>
42 #include <sys/mount.h>
43 #include <sys/mbuf.h>
44 #include <sys/proc.h>
45 #include <sys/protosw.h>
46 #include <sys/rwlock.h>
47 #include <sys/sf_buf.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/syscallsubr.h>
51 #include <sys/sysctl.h>
52 #include <sys/sysproto.h>
53 #include <sys/vnode.h>
54
55 #include <net/vnet.h>
56 #include <netinet/in.h>
57 #include <netinet/tcp.h>
58
59 #include <security/audit/audit.h>
60 #include <security/mac/mac_framework.h>
61
62 #include <vm/vm.h>
63 #include <vm/vm_object.h>
64 #include <vm/vm_pager.h>
65
66 static MALLOC_DEFINE(M_SENDFILE, "sendfile", "sendfile dynamic memory");
67
68 #define EXT_FLAG_SYNC EXT_FLAG_VENDOR1
69 #define EXT_FLAG_NOCACHE EXT_FLAG_VENDOR2
70 #define EXT_FLAG_CACHE_LAST EXT_FLAG_VENDOR3
71
72 /*
73 * Structure describing a single sendfile(2) I/O, which may consist of
74 * several underlying pager I/Os.
75 *
76 * The syscall context allocates the structure and initializes 'nios'
77 * to 1. As sendfile_swapin() runs through pages and starts asynchronous
78 * paging operations, it increments 'nios'.
79 *
80 * Every I/O completion calls sendfile_iodone(), which decrements the 'nios',
81 * and the syscall also calls sendfile_iodone() after allocating all mbufs,
82 * linking them and sending to socket. Whoever reaches zero 'nios' is
83 * responsible to * call pru_ready on the socket, to notify it of readyness
84 * of the data.
85 */
86 struct sf_io {
87 volatile u_int nios;
88 u_int error;
89 int npages;
90 struct socket *so;
91 struct mbuf *m;
92 vm_object_t obj;
93 vm_pindex_t pindex0;
94 #ifdef KERN_TLS
95 struct ktls_session *tls;
96 #endif
97 vm_page_t pa[];
98 };
99
100 /*
101 * Structure used to track requests with SF_SYNC flag.
102 */
103 struct sendfile_sync {
104 struct mtx mtx;
105 struct cv cv;
106 unsigned count;
107 bool waiting;
108 };
109
110 static void
sendfile_sync_destroy(struct sendfile_sync * sfs)111 sendfile_sync_destroy(struct sendfile_sync *sfs)
112 {
113 KASSERT(sfs->count == 0, ("sendfile sync %p still busy", sfs));
114
115 cv_destroy(&sfs->cv);
116 mtx_destroy(&sfs->mtx);
117 free(sfs, M_SENDFILE);
118 }
119
120 static void
sendfile_sync_signal(struct sendfile_sync * sfs)121 sendfile_sync_signal(struct sendfile_sync *sfs)
122 {
123 mtx_lock(&sfs->mtx);
124 KASSERT(sfs->count > 0, ("sendfile sync %p not busy", sfs));
125 if (--sfs->count == 0) {
126 if (!sfs->waiting) {
127 /* The sendfile() waiter was interrupted by a signal. */
128 sendfile_sync_destroy(sfs);
129 return;
130 } else {
131 cv_signal(&sfs->cv);
132 }
133 }
134 mtx_unlock(&sfs->mtx);
135 }
136
137 counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
138
139 static void
sfstat_init(const void * unused)140 sfstat_init(const void *unused)
141 {
142
143 COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
144 M_WAITOK);
145 }
146 SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
147
148 static int
sfstat_sysctl(SYSCTL_HANDLER_ARGS)149 sfstat_sysctl(SYSCTL_HANDLER_ARGS)
150 {
151 struct sfstat s;
152
153 COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
154 if (req->newptr)
155 COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
156 return (SYSCTL_OUT(req, &s, sizeof(s)));
157 }
158 SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat,
159 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
160 sfstat_sysctl, "I",
161 "sendfile statistics");
162
163 static void
sendfile_free_mext(struct mbuf * m)164 sendfile_free_mext(struct mbuf *m)
165 {
166 struct sf_buf *sf;
167 vm_page_t pg;
168 int flags;
169
170 KASSERT(m->m_flags & M_EXT && m->m_ext.ext_type == EXT_SFBUF,
171 ("%s: m %p !M_EXT or !EXT_SFBUF", __func__, m));
172
173 sf = m->m_ext.ext_arg1;
174 pg = sf_buf_page(sf);
175 flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
176
177 sf_buf_free(sf);
178 vm_page_release(pg, flags);
179
180 if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
181 struct sendfile_sync *sfs = m->m_ext.ext_arg2;
182 sendfile_sync_signal(sfs);
183 }
184 }
185
186 static void
sendfile_free_mext_pg(struct mbuf * m)187 sendfile_free_mext_pg(struct mbuf *m)
188 {
189 vm_page_t pg;
190 int flags, i;
191 bool cache_last;
192
193 M_ASSERTEXTPG(m);
194
195 cache_last = m->m_ext.ext_flags & EXT_FLAG_CACHE_LAST;
196 flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
197
198 for (i = 0; i < m->m_epg_npgs; i++) {
199 if (cache_last && i == m->m_epg_npgs - 1)
200 flags = 0;
201 pg = PHYS_TO_VM_PAGE(m->m_epg_pa[i]);
202 vm_page_release(pg, flags);
203 }
204
205 if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
206 struct sendfile_sync *sfs = m->m_ext.ext_arg1;
207 sendfile_sync_signal(sfs);
208 }
209 }
210
211 /*
212 * Helper function to calculate how much data to put into page i of n.
213 * Only first and last pages are special.
214 */
215 static inline off_t
xfsize(int i,int n,off_t off,off_t len)216 xfsize(int i, int n, off_t off, off_t len)
217 {
218
219 if (i == 0)
220 return (omin(PAGE_SIZE - (off & PAGE_MASK), len));
221
222 if (i == n - 1 && ((off + len) & PAGE_MASK) > 0)
223 return ((off + len) & PAGE_MASK);
224
225 return (PAGE_SIZE);
226 }
227
228 /*
229 * Helper function to get offset within object for i page.
230 */
231 static inline vm_ooffset_t
vmoff(int i,off_t off)232 vmoff(int i, off_t off)
233 {
234
235 if (i == 0)
236 return ((vm_ooffset_t)off);
237
238 return (trunc_page(off + i * PAGE_SIZE));
239 }
240
241 /*
242 * Helper function used when allocation of a page or sf_buf failed.
243 * Pretend as if we don't have enough space, subtract xfsize() of
244 * all pages that failed.
245 */
246 static inline void
fixspace(int old,int new,off_t off,int * space)247 fixspace(int old, int new, off_t off, int *space)
248 {
249
250 KASSERT(old > new, ("%s: old %d new %d", __func__, old, new));
251
252 /* Subtract last one. */
253 *space -= xfsize(old - 1, old, off, *space);
254 old--;
255
256 if (new == old)
257 /* There was only one page. */
258 return;
259
260 /* Subtract first one. */
261 if (new == 0) {
262 *space -= xfsize(0, old, off, *space);
263 new++;
264 }
265
266 /* Rest of pages are full sized. */
267 *space -= (old - new) * PAGE_SIZE;
268
269 KASSERT(*space >= 0, ("%s: space went backwards", __func__));
270 }
271
272 /*
273 * Wait for all in-flight ios to complete, we must not unwire pages
274 * under them.
275 */
276 static void
sendfile_iowait(struct sf_io * sfio,const char * wmesg)277 sendfile_iowait(struct sf_io *sfio, const char *wmesg)
278 {
279 while (atomic_load_int(&sfio->nios) != 1)
280 pause(wmesg, 1);
281 }
282
283 /*
284 * I/O completion callback.
285 */
286 static void
sendfile_iodone(void * arg,vm_page_t * pa,int count,int error)287 sendfile_iodone(void *arg, vm_page_t *pa, int count, int error)
288 {
289 struct sf_io *sfio = arg;
290 struct socket *so;
291 int i;
292
293 if (error != 0)
294 sfio->error = error;
295
296 /*
297 * Restore the valid page pointers. They are already
298 * unbusied, but still wired.
299 *
300 * XXXKIB since pages are only wired, and we do not
301 * own the object lock, other users might have
302 * invalidated them in meantime. Similarly, after we
303 * unbusied the swapped-in pages, they can become
304 * invalid under us.
305 */
306 MPASS(count == 0 || pa[0] != bogus_page);
307 for (i = 0; i < count; i++) {
308 if (pa[i] == bogus_page) {
309 sfio->pa[(pa[0]->pindex - sfio->pindex0) + i] =
310 pa[i] = vm_page_relookup(sfio->obj,
311 pa[0]->pindex + i);
312 KASSERT(pa[i] != NULL,
313 ("%s: page %p[%d] disappeared",
314 __func__, pa, i));
315 } else {
316 vm_page_xunbusy_unchecked(pa[i]);
317 }
318 }
319
320 if (!refcount_release(&sfio->nios))
321 return;
322
323 #ifdef INVARIANTS
324 for (i = 1; i < sfio->npages; i++) {
325 if (sfio->pa[i] == NULL)
326 break;
327 KASSERT(vm_page_wired(sfio->pa[i]),
328 ("sfio %p page %d %p not wired", sfio, i, sfio->pa[i]));
329 if (i == 0)
330 continue;
331 KASSERT(sfio->pa[0]->object == sfio->pa[i]->object,
332 ("sfio %p page %d %p wrong owner %p %p", sfio, i,
333 sfio->pa[i], sfio->pa[0]->object, sfio->pa[i]->object));
334 KASSERT(sfio->pa[0]->pindex + i == sfio->pa[i]->pindex,
335 ("sfio %p page %d %p wrong index %jx %jx", sfio, i,
336 sfio->pa[i], (uintmax_t)sfio->pa[0]->pindex,
337 (uintmax_t)sfio->pa[i]->pindex));
338 }
339 #endif
340
341 vm_object_pip_wakeup(sfio->obj);
342
343 if (sfio->m == NULL) {
344 /*
345 * Either I/O operation failed, or we failed to allocate
346 * buffers, or we bailed out on first busy page, or we
347 * succeeded filling the request without any I/Os. Anyway,
348 * pru_send hadn't been executed - nothing had been sent
349 * to the socket yet.
350 */
351 MPASS((curthread->td_pflags & TDP_KTHREAD) == 0);
352 free(sfio, M_SENDFILE);
353 return;
354 }
355
356 #if defined(KERN_TLS) && defined(INVARIANTS)
357 if ((sfio->m->m_flags & M_EXTPG) != 0)
358 KASSERT(sfio->tls == sfio->m->m_epg_tls,
359 ("TLS session mismatch"));
360 else
361 KASSERT(sfio->tls == NULL,
362 ("non-ext_pgs mbuf with TLS session"));
363 #endif
364 so = sfio->so;
365 CURVNET_SET(so->so_vnet);
366 if (__predict_false(sfio->error)) {
367 /*
368 * I/O operation failed. The state of data in the socket
369 * is now inconsistent, and all what we can do is to tear
370 * it down. Protocol abort method would tear down protocol
371 * state, free all ready mbufs and detach not ready ones.
372 * We will free the mbufs corresponding to this I/O manually.
373 *
374 * The socket would be marked with EIO and made available
375 * for read, so that application receives EIO on next
376 * syscall and eventually closes the socket.
377 */
378 so->so_proto->pr_usrreqs->pru_abort(so);
379 so->so_error = EIO;
380
381 mb_free_notready(sfio->m, sfio->npages);
382 #ifdef KERN_TLS
383 } else if (sfio->tls != NULL && sfio->tls->mode == TCP_TLS_MODE_SW) {
384 /*
385 * I/O operation is complete, but we still need to
386 * encrypt. We cannot do this in the interrupt thread
387 * of the disk controller, so forward the mbufs to a
388 * different thread.
389 *
390 * Donate the socket reference from sfio to rather
391 * than explicitly invoking soref().
392 */
393 ktls_enqueue(sfio->m, so, sfio->npages);
394 goto out_with_ref;
395 #endif
396 } else
397 (void)(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m,
398 sfio->npages);
399
400 SOCK_LOCK(so);
401 sorele(so);
402 #ifdef KERN_TLS
403 out_with_ref:
404 #endif
405 CURVNET_RESTORE();
406 free(sfio, M_SENDFILE);
407 }
408
409 /*
410 * Iterate through pages vector and request paging for non-valid pages.
411 */
412 static int
sendfile_swapin(vm_object_t obj,struct sf_io * sfio,int * nios,off_t off,off_t len,int rhpages,int flags)413 sendfile_swapin(vm_object_t obj, struct sf_io *sfio, int *nios, off_t off,
414 off_t len, int rhpages, int flags)
415 {
416 vm_page_t *pa;
417 int a, count, count1, grabbed, i, j, npages, rv;
418
419 pa = sfio->pa;
420 npages = sfio->npages;
421 *nios = 0;
422 flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0;
423 sfio->pindex0 = OFF_TO_IDX(off);
424
425 /*
426 * First grab all the pages and wire them. Note that we grab
427 * only required pages. Readahead pages are dealt with later.
428 */
429 grabbed = vm_page_grab_pages_unlocked(obj, OFF_TO_IDX(off),
430 VM_ALLOC_NORMAL | VM_ALLOC_WIRED | flags, pa, npages);
431 if (grabbed < npages) {
432 for (int i = grabbed; i < npages; i++)
433 pa[i] = NULL;
434 npages = grabbed;
435 rhpages = 0;
436 }
437
438 for (i = 0; i < npages;) {
439 /* Skip valid pages. */
440 if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK,
441 xfsize(i, npages, off, len))) {
442 vm_page_xunbusy(pa[i]);
443 SFSTAT_INC(sf_pages_valid);
444 i++;
445 continue;
446 }
447
448 /*
449 * Next page is invalid. Check if it belongs to pager. It
450 * may not be there, which is a regular situation for shmem
451 * pager. For vnode pager this happens only in case of
452 * a sparse file.
453 *
454 * Important feature of vm_pager_has_page() is the hint
455 * stored in 'a', about how many pages we can pagein after
456 * this page in a single I/O.
457 */
458 VM_OBJECT_RLOCK(obj);
459 if (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL,
460 &a)) {
461 VM_OBJECT_RUNLOCK(obj);
462 pmap_zero_page(pa[i]);
463 vm_page_valid(pa[i]);
464 MPASS(pa[i]->dirty == 0);
465 vm_page_xunbusy(pa[i]);
466 i++;
467 continue;
468 }
469 VM_OBJECT_RUNLOCK(obj);
470
471 /*
472 * We want to pagein as many pages as possible, limited only
473 * by the 'a' hint and actual request.
474 */
475 count = min(a + 1, npages - i);
476
477 /*
478 * We should not pagein into a valid page because
479 * there might be still unfinished write tracked by
480 * e.g. a buffer, thus we substitute any valid pages
481 * with the bogus one.
482 *
483 * We must not leave around xbusy pages which are not
484 * part of the run passed to vm_pager_getpages(),
485 * otherwise pager might deadlock waiting for the busy
486 * status of the page, e.g. if it constitues the
487 * buffer needed to validate other page.
488 *
489 * First trim the end of the run consisting of the
490 * valid pages, then replace the rest of the valid
491 * with bogus.
492 */
493 count1 = count;
494 for (j = i + count - 1; j > i; j--) {
495 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
496 xfsize(j, npages, off, len))) {
497 vm_page_xunbusy(pa[j]);
498 SFSTAT_INC(sf_pages_valid);
499 count--;
500 } else {
501 break;
502 }
503 }
504
505 /*
506 * The last page in the run pa[i + count - 1] is
507 * guaranteed to be invalid by the trim above, so it
508 * is not replaced with bogus, thus -1 in the loop end
509 * condition.
510 */
511 MPASS(pa[i + count - 1]->valid != VM_PAGE_BITS_ALL);
512 for (j = i + 1; j < i + count - 1; j++) {
513 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
514 xfsize(j, npages, off, len))) {
515 vm_page_xunbusy(pa[j]);
516 SFSTAT_INC(sf_pages_valid);
517 SFSTAT_INC(sf_pages_bogus);
518 pa[j] = bogus_page;
519 }
520 }
521
522 refcount_acquire(&sfio->nios);
523 rv = vm_pager_get_pages_async(obj, pa + i, count, NULL,
524 i + count == npages ? &rhpages : NULL,
525 &sendfile_iodone, sfio);
526 if (__predict_false(rv != VM_PAGER_OK)) {
527 sendfile_iowait(sfio, "sferrio");
528
529 /*
530 * Do remaining pages recovery before returning EIO.
531 * Pages from 0 to npages are wired.
532 * Pages from (i + count1) to npages are busied.
533 */
534 for (j = 0; j < npages; j++) {
535 if (j >= i + count1)
536 vm_page_xunbusy(pa[j]);
537 KASSERT(pa[j] != NULL && pa[j] != bogus_page,
538 ("%s: page %p[%d] I/O recovery failure",
539 __func__, pa, j));
540 vm_page_unwire(pa[j], PQ_INACTIVE);
541 pa[j] = NULL;
542 }
543 return (EIO);
544 }
545
546 SFSTAT_INC(sf_iocnt);
547 SFSTAT_ADD(sf_pages_read, count);
548 if (i + count == npages)
549 SFSTAT_ADD(sf_rhpages_read, rhpages);
550
551 i += count1;
552 (*nios)++;
553 }
554
555 if (*nios == 0 && npages != 0)
556 SFSTAT_INC(sf_noiocnt);
557
558 return (0);
559 }
560
561 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)562 sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
563 struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
564 int *bsize)
565 {
566 struct vattr va;
567 vm_object_t obj;
568 struct vnode *vp;
569 struct shmfd *shmfd;
570 int error;
571
572 error = 0;
573 vp = *vp_res = NULL;
574 obj = NULL;
575 shmfd = *shmfd_res = NULL;
576 *bsize = 0;
577
578 /*
579 * The file descriptor must be a regular file and have a
580 * backing VM object.
581 */
582 if (fp->f_type == DTYPE_VNODE) {
583 vp = fp->f_vnode;
584 vn_lock(vp, LK_SHARED | LK_RETRY);
585 if (vp->v_type != VREG) {
586 error = EINVAL;
587 goto out;
588 }
589 *bsize = vp->v_mount->mnt_stat.f_iosize;
590 obj = vp->v_object;
591 if (obj == NULL) {
592 error = EINVAL;
593 goto out;
594 }
595
596 /*
597 * Use the pager size when available to simplify synchronization
598 * with filesystems, which otherwise must atomically update both
599 * the vnode pager size and file size.
600 */
601 if (obj->type == OBJT_VNODE) {
602 VM_OBJECT_RLOCK(obj);
603 *obj_size = obj->un_pager.vnp.vnp_size;
604 } else {
605 error = VOP_GETATTR(vp, &va, td->td_ucred);
606 if (error != 0)
607 goto out;
608 *obj_size = va.va_size;
609 VM_OBJECT_RLOCK(obj);
610 }
611 } else if (fp->f_type == DTYPE_SHM) {
612 shmfd = fp->f_data;
613 obj = shmfd->shm_object;
614 VM_OBJECT_RLOCK(obj);
615 *obj_size = shmfd->shm_size;
616 } else {
617 error = EINVAL;
618 goto out;
619 }
620
621 if ((obj->flags & OBJ_DEAD) != 0) {
622 VM_OBJECT_RUNLOCK(obj);
623 error = EBADF;
624 goto out;
625 }
626
627 /*
628 * Temporarily increase the backing VM object's reference
629 * count so that a forced reclamation of its vnode does not
630 * immediately destroy it.
631 */
632 vm_object_reference_locked(obj);
633 VM_OBJECT_RUNLOCK(obj);
634 *obj_res = obj;
635 *vp_res = vp;
636 *shmfd_res = shmfd;
637
638 out:
639 if (vp != NULL)
640 VOP_UNLOCK(vp);
641 return (error);
642 }
643
644 static int
sendfile_getsock(struct thread * td,int s,struct file ** sock_fp,struct socket ** so)645 sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
646 struct socket **so)
647 {
648 int error;
649
650 *sock_fp = NULL;
651 *so = NULL;
652
653 /*
654 * The socket must be a stream socket and connected.
655 */
656 error = getsock_cap(td, s, &cap_send_rights,
657 sock_fp, NULL, NULL);
658 if (error != 0)
659 return (error);
660 *so = (*sock_fp)->f_data;
661 if ((*so)->so_type != SOCK_STREAM)
662 return (EINVAL);
663 /*
664 * SCTP one-to-one style sockets currently don't work with
665 * sendfile(). So indicate EINVAL for now.
666 */
667 if ((*so)->so_proto->pr_protocol == IPPROTO_SCTP)
668 return (EINVAL);
669 if (SOLISTENING(*so))
670 return (ENOTCONN);
671 return (0);
672 }
673
674 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,struct thread * td)675 vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
676 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
677 struct thread *td)
678 {
679 struct file *sock_fp;
680 struct vnode *vp;
681 struct vm_object *obj;
682 vm_page_t pga;
683 struct socket *so;
684 #ifdef KERN_TLS
685 struct ktls_session *tls;
686 #endif
687 struct mbuf *m, *mh, *mhtail;
688 struct sf_buf *sf;
689 struct shmfd *shmfd;
690 struct sendfile_sync *sfs;
691 struct vattr va;
692 off_t off, sbytes, rem, obj_size, nobj_size;
693 int bsize, error, ext_pgs_idx, hdrlen, max_pgs, softerr;
694 #ifdef KERN_TLS
695 int tls_enq_cnt;
696 #endif
697 bool use_ext_pgs;
698
699 obj = NULL;
700 so = NULL;
701 m = mh = NULL;
702 sfs = NULL;
703 #ifdef KERN_TLS
704 tls = NULL;
705 #endif
706 hdrlen = sbytes = 0;
707 softerr = 0;
708 use_ext_pgs = false;
709
710 error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
711 if (error != 0)
712 return (error);
713
714 error = sendfile_getsock(td, sockfd, &sock_fp, &so);
715 if (error != 0)
716 goto out;
717
718 #ifdef MAC
719 error = mac_socket_check_send(td->td_ucred, so);
720 if (error != 0)
721 goto out;
722 #endif
723
724 SFSTAT_INC(sf_syscalls);
725 SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags));
726
727 if (flags & SF_SYNC) {
728 sfs = malloc(sizeof(*sfs), M_SENDFILE, M_WAITOK | M_ZERO);
729 mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
730 cv_init(&sfs->cv, "sendfile");
731 sfs->waiting = true;
732 }
733
734 rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset;
735
736 /*
737 * Protect against multiple writers to the socket.
738 *
739 * XXXRW: Historically this has assumed non-interruptibility, so now
740 * we implement that, but possibly shouldn't.
741 */
742 error = SOCK_IO_SEND_LOCK(so, SBL_WAIT | SBL_NOINTR);
743 if (error != 0)
744 goto out;
745 #ifdef KERN_TLS
746 tls = ktls_hold(so->so_snd.sb_tls_info);
747 #endif
748
749 /*
750 * Loop through the pages of the file, starting with the requested
751 * offset. Get a file page (do I/O if necessary), map the file page
752 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
753 * it on the socket.
754 * This is done in two loops. The inner loop turns as many pages
755 * as it can, up to available socket buffer space, without blocking
756 * into mbufs to have it bulk delivered into the socket send buffer.
757 * The outer loop checks the state and available space of the socket
758 * and takes care of the overall progress.
759 */
760 for (off = offset; rem > 0; ) {
761 struct sf_io *sfio;
762 vm_page_t *pa;
763 struct mbuf *m0, *mtail;
764 int nios, space, npages, rhpages;
765
766 mtail = NULL;
767 /*
768 * Check the socket state for ongoing connection,
769 * no errors and space in socket buffer.
770 * If space is low allow for the remainder of the
771 * file to be processed if it fits the socket buffer.
772 * Otherwise block in waiting for sufficient space
773 * to proceed, or if the socket is nonblocking, return
774 * to userland with EAGAIN while reporting how far
775 * we've come.
776 * We wait until the socket buffer has significant free
777 * space to do bulk sends. This makes good use of file
778 * system read ahead and allows packet segmentation
779 * offloading hardware to take over lots of work. If
780 * we were not careful here we would send off only one
781 * sfbuf at a time.
782 */
783 SOCKBUF_LOCK(&so->so_snd);
784 if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
785 so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
786 retry_space:
787 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
788 error = EPIPE;
789 SOCKBUF_UNLOCK(&so->so_snd);
790 goto done;
791 } else if (so->so_error) {
792 error = so->so_error;
793 so->so_error = 0;
794 SOCKBUF_UNLOCK(&so->so_snd);
795 goto done;
796 }
797 if ((so->so_state & SS_ISCONNECTED) == 0) {
798 SOCKBUF_UNLOCK(&so->so_snd);
799 error = ENOTCONN;
800 goto done;
801 }
802
803 space = sbspace(&so->so_snd);
804 if (space < rem &&
805 (space <= 0 ||
806 space < so->so_snd.sb_lowat)) {
807 if (so->so_state & SS_NBIO) {
808 SOCKBUF_UNLOCK(&so->so_snd);
809 error = EAGAIN;
810 goto done;
811 }
812 /*
813 * sbwait drops the lock while sleeping.
814 * When we loop back to retry_space the
815 * state may have changed and we retest
816 * for it.
817 */
818 error = sbwait(&so->so_snd);
819 /*
820 * An error from sbwait usually indicates that we've
821 * been interrupted by a signal. If we've sent anything
822 * then return bytes sent, otherwise return the error.
823 */
824 if (error != 0) {
825 SOCKBUF_UNLOCK(&so->so_snd);
826 goto done;
827 }
828 goto retry_space;
829 }
830 SOCKBUF_UNLOCK(&so->so_snd);
831
832 /*
833 * At the beginning of the first loop check if any headers
834 * are specified and copy them into mbufs. Reduce space in
835 * the socket buffer by the size of the header mbuf chain.
836 * Clear hdr_uio here and hdrlen at the end of the first loop.
837 */
838 if (hdr_uio != NULL && hdr_uio->uio_resid > 0) {
839 hdr_uio->uio_td = td;
840 hdr_uio->uio_rw = UIO_WRITE;
841 #ifdef KERN_TLS
842 if (tls != NULL)
843 mh = m_uiotombuf(hdr_uio, M_WAITOK, space,
844 tls->params.max_frame_len, M_EXTPG);
845 else
846 #endif
847 mh = m_uiotombuf(hdr_uio, M_WAITOK,
848 space, 0, 0);
849 hdrlen = m_length(mh, &mhtail);
850 space -= hdrlen;
851 /*
852 * If header consumed all the socket buffer space,
853 * don't waste CPU cycles and jump to the end.
854 */
855 if (space == 0) {
856 sfio = NULL;
857 nios = 0;
858 goto prepend_header;
859 }
860 hdr_uio = NULL;
861 }
862
863 if (vp != NULL) {
864 error = vn_lock(vp, LK_SHARED);
865 if (error != 0)
866 goto done;
867
868 /*
869 * Check to see if the file size has changed.
870 */
871 if (obj->type == OBJT_VNODE) {
872 VM_OBJECT_RLOCK(obj);
873 nobj_size = obj->un_pager.vnp.vnp_size;
874 VM_OBJECT_RUNLOCK(obj);
875 } else {
876 error = VOP_GETATTR(vp, &va, td->td_ucred);
877 if (error != 0) {
878 VOP_UNLOCK(vp);
879 goto done;
880 }
881 nobj_size = va.va_size;
882 }
883 if (off >= nobj_size) {
884 VOP_UNLOCK(vp);
885 goto done;
886 }
887 if (nobj_size != obj_size) {
888 obj_size = nobj_size;
889 rem = nbytes ? omin(nbytes + offset, obj_size) :
890 obj_size;
891 rem -= off;
892 }
893 }
894
895 if (space > rem)
896 space = rem;
897 else if (space > PAGE_SIZE) {
898 /*
899 * Use page boundaries when possible for large
900 * requests.
901 */
902 if (off & PAGE_MASK)
903 space -= (PAGE_SIZE - (off & PAGE_MASK));
904 space = trunc_page(space);
905 if (off & PAGE_MASK)
906 space += (PAGE_SIZE - (off & PAGE_MASK));
907 }
908
909 npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE);
910
911 /*
912 * Calculate maximum allowed number of pages for readahead
913 * at this iteration. If SF_USER_READAHEAD was set, we don't
914 * do any heuristics and use exactly the value supplied by
915 * application. Otherwise, we allow readahead up to "rem".
916 * If application wants more, let it be, but there is no
917 * reason to go above maxphys. Also check against "obj_size",
918 * since vm_pager_has_page() can hint beyond EOF.
919 */
920 if (flags & SF_USER_READAHEAD) {
921 rhpages = SF_READAHEAD(flags);
922 } else {
923 rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) -
924 npages;
925 rhpages += SF_READAHEAD(flags);
926 }
927 rhpages = min(howmany(maxphys, PAGE_SIZE), rhpages);
928 rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) -
929 npages, rhpages);
930
931 sfio = malloc(sizeof(struct sf_io) +
932 npages * sizeof(vm_page_t), M_SENDFILE, M_WAITOK);
933 refcount_init(&sfio->nios, 1);
934 sfio->obj = obj;
935 sfio->error = 0;
936 sfio->m = NULL;
937 sfio->npages = npages;
938 #ifdef KERN_TLS
939 /*
940 * This doesn't use ktls_hold() because sfio->m will
941 * also have a reference on 'tls' that will be valid
942 * for all of sfio's lifetime.
943 */
944 sfio->tls = tls;
945 #endif
946 vm_object_pip_add(obj, 1);
947 error = sendfile_swapin(obj, sfio, &nios, off, space, rhpages,
948 flags);
949 if (error != 0) {
950 if (vp != NULL)
951 VOP_UNLOCK(vp);
952 sendfile_iodone(sfio, NULL, 0, error);
953 goto done;
954 }
955
956 /*
957 * Loop and construct maximum sized mbuf chain to be bulk
958 * dumped into socket buffer.
959 */
960 pa = sfio->pa;
961
962 /*
963 * Use unmapped mbufs if enabled for TCP. Unmapped
964 * bufs are restricted to TCP as that is what has been
965 * tested. In particular, unmapped mbufs have not
966 * been tested with UNIX-domain sockets.
967 *
968 * TLS frames always require unmapped mbufs.
969 */
970 if ((mb_use_ext_pgs &&
971 so->so_proto->pr_protocol == IPPROTO_TCP)
972 #ifdef KERN_TLS
973 || tls != NULL
974 #endif
975 ) {
976 use_ext_pgs = true;
977 #ifdef KERN_TLS
978 if (tls != NULL)
979 max_pgs = num_pages(tls->params.max_frame_len);
980 else
981 #endif
982 max_pgs = MBUF_PEXT_MAX_PGS;
983
984 /* Start at last index, to wrap on first use. */
985 ext_pgs_idx = max_pgs - 1;
986 }
987
988 for (int i = 0; i < npages; i++) {
989 /*
990 * If a page wasn't grabbed successfully, then
991 * trim the array. Can happen only with SF_NODISKIO.
992 */
993 if (pa[i] == NULL) {
994 SFSTAT_INC(sf_busy);
995 fixspace(npages, i, off, &space);
996 sfio->npages = i;
997 softerr = EBUSY;
998 break;
999 }
1000 pga = pa[i];
1001 if (pga == bogus_page)
1002 pga = vm_page_relookup(obj, sfio->pindex0 + i);
1003
1004 if (use_ext_pgs) {
1005 off_t xfs;
1006
1007 ext_pgs_idx++;
1008 if (ext_pgs_idx == max_pgs) {
1009 m0 = mb_alloc_ext_pgs(M_WAITOK,
1010 sendfile_free_mext_pg);
1011
1012 if (flags & SF_NOCACHE) {
1013 m0->m_ext.ext_flags |=
1014 EXT_FLAG_NOCACHE;
1015
1016 /*
1017 * See comment below regarding
1018 * ignoring SF_NOCACHE for the
1019 * last page.
1020 */
1021 if ((npages - i <= max_pgs) &&
1022 ((off + space) & PAGE_MASK) &&
1023 (rem > space || rhpages > 0))
1024 m0->m_ext.ext_flags |=
1025 EXT_FLAG_CACHE_LAST;
1026 }
1027 if (sfs != NULL) {
1028 m0->m_ext.ext_flags |=
1029 EXT_FLAG_SYNC;
1030 m0->m_ext.ext_arg1 = sfs;
1031 mtx_lock(&sfs->mtx);
1032 sfs->count++;
1033 mtx_unlock(&sfs->mtx);
1034 }
1035 ext_pgs_idx = 0;
1036
1037 /* Append to mbuf chain. */
1038 if (mtail != NULL)
1039 mtail->m_next = m0;
1040 else
1041 m = m0;
1042 mtail = m0;
1043 m0->m_epg_1st_off =
1044 vmoff(i, off) & PAGE_MASK;
1045 }
1046 if (nios) {
1047 mtail->m_flags |= M_NOTREADY;
1048 m0->m_epg_nrdy++;
1049 }
1050
1051 m0->m_epg_pa[ext_pgs_idx] = VM_PAGE_TO_PHYS(pga);
1052 m0->m_epg_npgs++;
1053 xfs = xfsize(i, npages, off, space);
1054 m0->m_epg_last_len = xfs;
1055 MBUF_EXT_PGS_ASSERT_SANITY(m0);
1056 mtail->m_len += xfs;
1057 mtail->m_ext.ext_size += PAGE_SIZE;
1058 continue;
1059 }
1060
1061 /*
1062 * Get a sendfile buf. When allocating the
1063 * first buffer for mbuf chain, we usually
1064 * wait as long as necessary, but this wait
1065 * can be interrupted. For consequent
1066 * buffers, do not sleep, since several
1067 * threads might exhaust the buffers and then
1068 * deadlock.
1069 */
1070 sf = sf_buf_alloc(pga,
1071 m != NULL ? SFB_NOWAIT : SFB_CATCH);
1072 if (sf == NULL) {
1073 SFSTAT_INC(sf_allocfail);
1074 sendfile_iowait(sfio, "sfnosf");
1075 for (int j = i; j < npages; j++) {
1076 vm_page_unwire(pa[j], PQ_INACTIVE);
1077 pa[j] = NULL;
1078 }
1079 if (m == NULL)
1080 softerr = ENOBUFS;
1081 fixspace(npages, i, off, &space);
1082 sfio->npages = i;
1083 break;
1084 }
1085
1086 m0 = m_get(M_WAITOK, MT_DATA);
1087 m0->m_ext.ext_buf = (char *)sf_buf_kva(sf);
1088 m0->m_ext.ext_size = PAGE_SIZE;
1089 m0->m_ext.ext_arg1 = sf;
1090 m0->m_ext.ext_type = EXT_SFBUF;
1091 m0->m_ext.ext_flags = EXT_FLAG_EMBREF;
1092 m0->m_ext.ext_free = sendfile_free_mext;
1093 /*
1094 * SF_NOCACHE sets the page as being freed upon send.
1095 * However, we ignore it for the last page in 'space',
1096 * if the page is truncated, and we got more data to
1097 * send (rem > space), or if we have readahead
1098 * configured (rhpages > 0).
1099 */
1100 if ((flags & SF_NOCACHE) &&
1101 (i != npages - 1 ||
1102 !((off + space) & PAGE_MASK) ||
1103 !(rem > space || rhpages > 0)))
1104 m0->m_ext.ext_flags |= EXT_FLAG_NOCACHE;
1105 if (sfs != NULL) {
1106 m0->m_ext.ext_flags |= EXT_FLAG_SYNC;
1107 m0->m_ext.ext_arg2 = sfs;
1108 mtx_lock(&sfs->mtx);
1109 sfs->count++;
1110 mtx_unlock(&sfs->mtx);
1111 }
1112 m0->m_ext.ext_count = 1;
1113 m0->m_flags |= (M_EXT | M_RDONLY);
1114 if (nios)
1115 m0->m_flags |= M_NOTREADY;
1116 m0->m_data = (char *)sf_buf_kva(sf) +
1117 (vmoff(i, off) & PAGE_MASK);
1118 m0->m_len = xfsize(i, npages, off, space);
1119
1120 /* Append to mbuf chain. */
1121 if (mtail != NULL)
1122 mtail->m_next = m0;
1123 else
1124 m = m0;
1125 mtail = m0;
1126 }
1127
1128 if (vp != NULL)
1129 VOP_UNLOCK(vp);
1130
1131 /* Keep track of bytes processed. */
1132 off += space;
1133 rem -= space;
1134
1135 /*
1136 * Prepend header, if any. Save pointer to first mbuf
1137 * with a page.
1138 */
1139 if (hdrlen) {
1140 prepend_header:
1141 m0 = mhtail->m_next = m;
1142 m = mh;
1143 mh = NULL;
1144 } else
1145 m0 = m;
1146
1147 if (m == NULL) {
1148 KASSERT(softerr, ("%s: m NULL, no error", __func__));
1149 error = softerr;
1150 sendfile_iodone(sfio, NULL, 0, 0);
1151 goto done;
1152 }
1153
1154 /* Add the buffer chain to the socket buffer. */
1155 KASSERT(m_length(m, NULL) == space + hdrlen,
1156 ("%s: mlen %u space %d hdrlen %d",
1157 __func__, m_length(m, NULL), space, hdrlen));
1158
1159 CURVNET_SET(so->so_vnet);
1160 #ifdef KERN_TLS
1161 if (tls != NULL)
1162 ktls_frame(m, tls, &tls_enq_cnt, TLS_RLTYPE_APP);
1163 #endif
1164 if (nios == 0) {
1165 /*
1166 * If sendfile_swapin() didn't initiate any I/Os,
1167 * which happens if all data is cached in VM, or if
1168 * the header consumed all socket buffer space and
1169 * sfio is NULL, then we can send data right now
1170 * without the PRUS_NOTREADY flag.
1171 */
1172 if (sfio != NULL)
1173 sendfile_iodone(sfio, NULL, 0, 0);
1174 #ifdef KERN_TLS
1175 if (tls != NULL && tls->mode == TCP_TLS_MODE_SW) {
1176 error = (*so->so_proto->pr_usrreqs->pru_send)
1177 (so, PRUS_NOTREADY, m, NULL, NULL, td);
1178 if (error != 0) {
1179 m_freem(m);
1180 } else {
1181 soref(so);
1182 ktls_enqueue(m, so, tls_enq_cnt);
1183 }
1184 } else
1185 #endif
1186 error = (*so->so_proto->pr_usrreqs->pru_send)
1187 (so, 0, m, NULL, NULL, td);
1188 } else {
1189 sfio->so = so;
1190 sfio->m = m0;
1191 soref(so);
1192 error = (*so->so_proto->pr_usrreqs->pru_send)
1193 (so, PRUS_NOTREADY, m, NULL, NULL, td);
1194 sendfile_iodone(sfio, NULL, 0, error);
1195 }
1196 CURVNET_RESTORE();
1197
1198 m = NULL;
1199 if (error)
1200 goto done;
1201 sbytes += space + hdrlen;
1202 if (hdrlen)
1203 hdrlen = 0;
1204 if (softerr) {
1205 error = softerr;
1206 goto done;
1207 }
1208 }
1209
1210 /*
1211 * Send trailers. Wimp out and use writev(2).
1212 */
1213 if (trl_uio != NULL) {
1214 SOCK_IO_SEND_UNLOCK(so);
1215 error = kern_writev(td, sockfd, trl_uio);
1216 if (error == 0)
1217 sbytes += td->td_retval[0];
1218 goto out;
1219 }
1220
1221 done:
1222 SOCK_IO_SEND_UNLOCK(so);
1223 out:
1224 /*
1225 * If there was no error we have to clear td->td_retval[0]
1226 * because it may have been set by writev.
1227 */
1228 if (error == 0) {
1229 td->td_retval[0] = 0;
1230 }
1231 if (sent != NULL) {
1232 (*sent) = sbytes;
1233 }
1234 if (obj != NULL)
1235 vm_object_deallocate(obj);
1236 if (so)
1237 fdrop(sock_fp, td);
1238 if (m)
1239 m_freem(m);
1240 if (mh)
1241 m_freem(mh);
1242
1243 if (sfs != NULL) {
1244 mtx_lock(&sfs->mtx);
1245 if (sfs->count != 0)
1246 error = cv_wait_sig(&sfs->cv, &sfs->mtx);
1247 if (sfs->count == 0) {
1248 sendfile_sync_destroy(sfs);
1249 } else {
1250 sfs->waiting = false;
1251 mtx_unlock(&sfs->mtx);
1252 }
1253 }
1254 #ifdef KERN_TLS
1255 if (tls != NULL)
1256 ktls_free(tls);
1257 #endif
1258
1259 if (error == ERESTART)
1260 error = EINTR;
1261
1262 return (error);
1263 }
1264
1265 static int
sendfile(struct thread * td,struct sendfile_args * uap,int compat)1266 sendfile(struct thread *td, struct sendfile_args *uap, int compat)
1267 {
1268 struct sf_hdtr hdtr;
1269 struct uio *hdr_uio, *trl_uio;
1270 struct file *fp;
1271 off_t sbytes;
1272 int error;
1273
1274 /*
1275 * File offset must be positive. If it goes beyond EOF
1276 * we send only the header/trailer and no payload data.
1277 */
1278 if (uap->offset < 0)
1279 return (EINVAL);
1280
1281 sbytes = 0;
1282 hdr_uio = trl_uio = NULL;
1283
1284 if (uap->hdtr != NULL) {
1285 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
1286 if (error != 0)
1287 goto out;
1288 if (hdtr.headers != NULL) {
1289 error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
1290 &hdr_uio);
1291 if (error != 0)
1292 goto out;
1293 #ifdef COMPAT_FREEBSD4
1294 /*
1295 * In FreeBSD < 5.0 the nbytes to send also included
1296 * the header. If compat is specified subtract the
1297 * header size from nbytes.
1298 */
1299 if (compat) {
1300 if (uap->nbytes > hdr_uio->uio_resid)
1301 uap->nbytes -= hdr_uio->uio_resid;
1302 else
1303 uap->nbytes = 0;
1304 }
1305 #endif
1306 }
1307 if (hdtr.trailers != NULL) {
1308 error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
1309 &trl_uio);
1310 if (error != 0)
1311 goto out;
1312 }
1313 }
1314
1315 AUDIT_ARG_FD(uap->fd);
1316
1317 /*
1318 * sendfile(2) can start at any offset within a file so we require
1319 * CAP_READ+CAP_SEEK = CAP_PREAD.
1320 */
1321 if ((error = fget_read(td, uap->fd, &cap_pread_rights, &fp)) != 0)
1322 goto out;
1323
1324 error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
1325 uap->nbytes, &sbytes, uap->flags, td);
1326 fdrop(fp, td);
1327
1328 if (uap->sbytes != NULL)
1329 (void)copyout(&sbytes, uap->sbytes, sizeof(off_t));
1330
1331 out:
1332 free(hdr_uio, M_IOV);
1333 free(trl_uio, M_IOV);
1334 return (error);
1335 }
1336
1337 /*
1338 * sendfile(2)
1339 *
1340 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1341 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1342 *
1343 * Send a file specified by 'fd' and starting at 'offset' to a socket
1344 * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
1345 * 0. Optionally add a header and/or trailer to the socket output. If
1346 * specified, write the total number of bytes sent into *sbytes.
1347 */
1348 int
sys_sendfile(struct thread * td,struct sendfile_args * uap)1349 sys_sendfile(struct thread *td, struct sendfile_args *uap)
1350 {
1351
1352 return (sendfile(td, uap, 0));
1353 }
1354
1355 #ifdef COMPAT_FREEBSD4
1356 int
freebsd4_sendfile(struct thread * td,struct freebsd4_sendfile_args * uap)1357 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
1358 {
1359 struct sendfile_args args;
1360
1361 args.fd = uap->fd;
1362 args.s = uap->s;
1363 args.offset = uap->offset;
1364 args.nbytes = uap->nbytes;
1365 args.hdtr = uap->hdtr;
1366 args.sbytes = uap->sbytes;
1367 args.flags = uap->flags;
1368
1369 return (sendfile(td, &args, 1));
1370 }
1371 #endif /* COMPAT_FREEBSD4 */
1372