2 * Copyright (c) 2013-2015 Gleb Smirnoff <glebius@FreeBSD.org>
3 * Copyright (c) 1998, David Greenman. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "opt_kern_tls.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/capsicum.h>
38 #include <sys/kernel.h>
39 #include <netinet/in.h>
42 #include <sys/mutex.h>
43 #include <sys/sysproto.h>
44 #include <sys/malloc.h>
47 #include <sys/mount.h>
49 #include <sys/protosw.h>
50 #include <sys/rwlock.h>
51 #include <sys/sf_buf.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysctl.h>
56 #include <sys/vnode.h>
59 #include <netinet/tcp.h>
61 #include <security/audit/audit.h>
62 #include <security/mac/mac_framework.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_pager.h>
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
73 * Structure describing a single sendfile(2) I/O, which may consist of
74 * several underlying pager I/Os.
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'.
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
93 struct ktls_session *tls;
99 * Structure used to track requests with SF_SYNC flag.
101 struct sendfile_sync {
107 counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
110 sfstat_init(const void *unused)
113 COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
116 SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
119 sfstat_sysctl(SYSCTL_HANDLER_ARGS)
123 COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
125 COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
126 return (SYSCTL_OUT(req, &s, sizeof(s)));
128 SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat, CTLTYPE_OPAQUE | CTLFLAG_RW,
129 NULL, 0, sfstat_sysctl, "I", "sendfile statistics");
132 sendfile_free_mext(struct mbuf *m)
138 KASSERT(m->m_flags & M_EXT && m->m_ext.ext_type == EXT_SFBUF,
139 ("%s: m %p !M_EXT or !EXT_SFBUF", __func__, m));
141 sf = m->m_ext.ext_arg1;
142 pg = sf_buf_page(sf);
143 flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
146 vm_page_release(pg, flags);
148 if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
149 struct sendfile_sync *sfs = m->m_ext.ext_arg2;
152 KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0"));
153 if (--sfs->count == 0)
155 mtx_unlock(&sfs->mtx);
160 sendfile_free_mext_pg(struct mbuf *m)
162 struct mbuf_ext_pgs *ext_pgs;
167 KASSERT(m->m_flags & M_EXT && m->m_ext.ext_type == EXT_PGS,
168 ("%s: m %p !M_EXT or !EXT_PGS", __func__, m));
170 cache_last = m->m_ext.ext_flags & EXT_FLAG_CACHE_LAST;
171 ext_pgs = m->m_ext.ext_pgs;
172 flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
174 for (i = 0; i < ext_pgs->npgs; i++) {
175 if (cache_last && i == ext_pgs->npgs - 1)
177 pg = PHYS_TO_VM_PAGE(ext_pgs->pa[i]);
178 vm_page_release(pg, flags);
181 if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
182 struct sendfile_sync *sfs = m->m_ext.ext_arg2;
185 KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0"));
186 if (--sfs->count == 0)
188 mtx_unlock(&sfs->mtx);
193 * Helper function to calculate how much data to put into page i of n.
194 * Only first and last pages are special.
197 xfsize(int i, int n, off_t off, off_t len)
201 return (omin(PAGE_SIZE - (off & PAGE_MASK), len));
203 if (i == n - 1 && ((off + len) & PAGE_MASK) > 0)
204 return ((off + len) & PAGE_MASK);
210 * Helper function to get offset within object for i page.
212 static inline vm_ooffset_t
213 vmoff(int i, off_t off)
217 return ((vm_ooffset_t)off);
219 return (trunc_page(off + i * PAGE_SIZE));
223 * Helper function used when allocation of a page or sf_buf failed.
224 * Pretend as if we don't have enough space, subtract xfsize() of
225 * all pages that failed.
228 fixspace(int old, int new, off_t off, int *space)
231 KASSERT(old > new, ("%s: old %d new %d", __func__, old, new));
233 /* Subtract last one. */
234 *space -= xfsize(old - 1, old, off, *space);
238 /* There was only one page. */
241 /* Subtract first one. */
243 *space -= xfsize(0, old, off, *space);
247 /* Rest of pages are full sized. */
248 *space -= (old - new) * PAGE_SIZE;
250 KASSERT(*space >= 0, ("%s: space went backwards", __func__));
254 * I/O completion callback.
257 sendfile_iodone(void *arg, vm_page_t *pg, int count, int error)
259 struct sf_io *sfio = arg;
260 struct socket *so = sfio->so;
262 for (int i = 0; i < count; i++)
263 if (pg[i] != bogus_page)
264 vm_page_xunbusy(pg[i]);
269 if (!refcount_release(&sfio->nios))
272 if (__predict_false(sfio->error && sfio->m == NULL)) {
274 * I/O operation failed, but pru_send hadn't been executed -
275 * nothing had been sent to the socket. The syscall has
276 * returned error to the user.
282 #if defined(KERN_TLS) && defined(INVARIANTS)
283 if ((sfio->m->m_flags & M_EXT) != 0 &&
284 sfio->m->m_ext.ext_type == EXT_PGS)
285 KASSERT(sfio->tls == sfio->m->m_ext.ext_pgs->tls,
286 ("TLS session mismatch"));
288 KASSERT(sfio->tls == NULL,
289 ("non-ext_pgs mbuf with TLS session"));
291 CURVNET_SET(so->so_vnet);
292 if (__predict_false(sfio->error)) {
294 * I/O operation failed. The state of data in the socket
295 * is now inconsistent, and all what we can do is to tear
296 * it down. Protocol abort method would tear down protocol
297 * state, free all ready mbufs and detach not ready ones.
298 * We will free the mbufs corresponding to this I/O manually.
300 * The socket would be marked with EIO and made available
301 * for read, so that application receives EIO on next
302 * syscall and eventually closes the socket.
304 so->so_proto->pr_usrreqs->pru_abort(so);
307 mb_free_notready(sfio->m, sfio->npages);
309 } else if (sfio->tls != NULL && sfio->tls->mode == TCP_TLS_MODE_SW) {
311 * I/O operation is complete, but we still need to
312 * encrypt. We cannot do this in the interrupt thread
313 * of the disk controller, so forward the mbufs to a
316 * Donate the socket reference from sfio to rather
317 * than explicitly invoking soref().
319 ktls_enqueue(sfio->m, so, sfio->npages);
323 (void)(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m,
336 * Iterate through pages vector and request paging for non-valid pages.
339 sendfile_swapin(vm_object_t obj, struct sf_io *sfio, int *nios, off_t off,
340 off_t len, int npages, int rhpages, int flags)
342 vm_page_t *pa = sfio->pa;
346 flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0;
349 * First grab all the pages and wire them. Note that we grab
350 * only required pages. Readahead pages are dealt with later.
352 VM_OBJECT_WLOCK(obj);
354 grabbed = vm_page_grab_pages(obj, OFF_TO_IDX(off),
355 VM_ALLOC_NORMAL | VM_ALLOC_WIRED | flags, pa, npages);
356 if (grabbed < npages) {
357 for (int i = grabbed; i < npages; i++)
363 for (int i = 0; i < npages;) {
366 /* Skip valid pages. */
367 if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK,
368 xfsize(i, npages, off, len))) {
369 vm_page_xunbusy(pa[i]);
370 SFSTAT_INC(sf_pages_valid);
376 * Next page is invalid. Check if it belongs to pager. It
377 * may not be there, which is a regular situation for shmem
378 * pager. For vnode pager this happens only in case of
381 * Important feature of vm_pager_has_page() is the hint
382 * stored in 'a', about how many pages we can pagein after
383 * this page in a single I/O.
385 if (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL,
387 pmap_zero_page(pa[i]);
388 pa[i]->valid = VM_PAGE_BITS_ALL;
389 MPASS(pa[i]->dirty == 0);
390 vm_page_xunbusy(pa[i]);
396 * We want to pagein as many pages as possible, limited only
397 * by the 'a' hint and actual request.
399 count = min(a + 1, npages - i);
402 * We should not pagein into a valid page, thus we first trim
403 * any valid pages off the end of request, and substitute
404 * to bogus_page those, that are in the middle.
406 for (j = i + count - 1; j > i; j--) {
407 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
408 xfsize(j, npages, off, len))) {
414 for (j = i + 1; j < i + count - 1; j++)
415 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
416 xfsize(j, npages, off, len))) {
417 vm_page_xunbusy(pa[j]);
418 SFSTAT_INC(sf_pages_valid);
419 SFSTAT_INC(sf_pages_bogus);
423 refcount_acquire(&sfio->nios);
424 rv = vm_pager_get_pages_async(obj, pa + i, count, NULL,
425 i + count == npages ? &rhpages : NULL,
426 &sendfile_iodone, sfio);
427 if (__predict_false(rv != VM_PAGER_OK)) {
429 * Perform full pages recovery before returning EIO.
430 * Pages from 0 to npages are wired.
431 * Pages from i to npages are also busied.
432 * Pages from (i + 1) to (i + count - 1) may be
433 * substituted to bogus page, and not busied.
435 for (j = 0; j < npages; j++) {
436 if (j > i && j < i + count - 1 &&
438 pa[j] = vm_page_lookup(obj,
439 OFF_TO_IDX(vmoff(j, off)));
441 vm_page_xunbusy(pa[j]);
442 KASSERT(pa[j] != NULL && pa[j] != bogus_page,
443 ("%s: page %p[%d] I/O recovery failure",
445 vm_page_unwire(pa[j], PQ_INACTIVE);
447 VM_OBJECT_WUNLOCK(obj);
451 SFSTAT_INC(sf_iocnt);
452 SFSTAT_ADD(sf_pages_read, count);
453 if (i + count == npages)
454 SFSTAT_ADD(sf_rhpages_read, rhpages);
457 * Restore the valid page pointers. They are already
458 * unbusied, but still wired.
460 for (j = i; j < i + count; j++)
461 if (pa[j] == bogus_page) {
462 pa[j] = vm_page_lookup(obj,
463 OFF_TO_IDX(vmoff(j, off)));
464 KASSERT(pa[j], ("%s: page %p[%d] disappeared",
472 VM_OBJECT_WUNLOCK(obj);
474 if (*nios == 0 && npages != 0)
475 SFSTAT_INC(sf_noiocnt);
481 sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
482 struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
493 shmfd = *shmfd_res = NULL;
497 * The file descriptor must be a regular file and have a
500 if (fp->f_type == DTYPE_VNODE) {
502 vn_lock(vp, LK_SHARED | LK_RETRY);
503 if (vp->v_type != VREG) {
507 *bsize = vp->v_mount->mnt_stat.f_iosize;
508 error = VOP_GETATTR(vp, &va, td->td_ucred);
511 *obj_size = va.va_size;
517 } else if (fp->f_type == DTYPE_SHM) {
520 obj = shmfd->shm_object;
521 *obj_size = shmfd->shm_size;
527 VM_OBJECT_WLOCK(obj);
528 if ((obj->flags & OBJ_DEAD) != 0) {
529 VM_OBJECT_WUNLOCK(obj);
535 * Temporarily increase the backing VM object's reference
536 * count so that a forced reclamation of its vnode does not
537 * immediately destroy it.
539 vm_object_reference_locked(obj);
540 VM_OBJECT_WUNLOCK(obj);
552 sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
561 * The socket must be a stream socket and connected.
563 error = getsock_cap(td, s, &cap_send_rights,
564 sock_fp, NULL, NULL);
567 *so = (*sock_fp)->f_data;
568 if ((*so)->so_type != SOCK_STREAM)
570 if (SOLISTENING(*so))
576 vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
577 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
580 struct file *sock_fp;
582 struct vm_object *obj;
585 struct ktls_session *tls;
587 struct mbuf_ext_pgs *ext_pgs;
588 struct mbuf *m, *mh, *mhtail;
591 struct sendfile_sync *sfs;
593 off_t off, sbytes, rem, obj_size;
594 int bsize, error, ext_pgs_idx, hdrlen, max_pgs, softerr;
611 error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
615 error = sendfile_getsock(td, sockfd, &sock_fp, &so);
620 error = mac_socket_check_send(td->td_ucred, so);
625 SFSTAT_INC(sf_syscalls);
626 SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags));
628 if (flags & SF_SYNC) {
629 sfs = malloc(sizeof *sfs, M_TEMP, M_WAITOK | M_ZERO);
630 mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
631 cv_init(&sfs->cv, "sendfile");
634 rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset;
637 * Protect against multiple writers to the socket.
639 * XXXRW: Historically this has assumed non-interruptibility, so now
640 * we implement that, but possibly shouldn't.
642 (void)sblock(&so->so_snd, SBL_WAIT | SBL_NOINTR);
644 tls = ktls_hold(so->so_snd.sb_tls_info);
648 * Loop through the pages of the file, starting with the requested
649 * offset. Get a file page (do I/O if necessary), map the file page
650 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
652 * This is done in two loops. The inner loop turns as many pages
653 * as it can, up to available socket buffer space, without blocking
654 * into mbufs to have it bulk delivered into the socket send buffer.
655 * The outer loop checks the state and available space of the socket
656 * and takes care of the overall progress.
658 for (off = offset; rem > 0; ) {
662 int nios, space, npages, rhpages;
666 * Check the socket state for ongoing connection,
667 * no errors and space in socket buffer.
668 * If space is low allow for the remainder of the
669 * file to be processed if it fits the socket buffer.
670 * Otherwise block in waiting for sufficient space
671 * to proceed, or if the socket is nonblocking, return
672 * to userland with EAGAIN while reporting how far
674 * We wait until the socket buffer has significant free
675 * space to do bulk sends. This makes good use of file
676 * system read ahead and allows packet segmentation
677 * offloading hardware to take over lots of work. If
678 * we were not careful here we would send off only one
681 SOCKBUF_LOCK(&so->so_snd);
682 if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
683 so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
685 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
687 SOCKBUF_UNLOCK(&so->so_snd);
689 } else if (so->so_error) {
690 error = so->so_error;
692 SOCKBUF_UNLOCK(&so->so_snd);
695 if ((so->so_state & SS_ISCONNECTED) == 0) {
696 SOCKBUF_UNLOCK(&so->so_snd);
701 space = sbspace(&so->so_snd);
704 space < so->so_snd.sb_lowat)) {
705 if (so->so_state & SS_NBIO) {
706 SOCKBUF_UNLOCK(&so->so_snd);
711 * sbwait drops the lock while sleeping.
712 * When we loop back to retry_space the
713 * state may have changed and we retest
716 error = sbwait(&so->so_snd);
718 * An error from sbwait usually indicates that we've
719 * been interrupted by a signal. If we've sent anything
720 * then return bytes sent, otherwise return the error.
723 SOCKBUF_UNLOCK(&so->so_snd);
728 SOCKBUF_UNLOCK(&so->so_snd);
731 * At the beginning of the first loop check if any headers
732 * are specified and copy them into mbufs. Reduce space in
733 * the socket buffer by the size of the header mbuf chain.
734 * Clear hdr_uio here and hdrlen at the end of the first loop.
736 if (hdr_uio != NULL && hdr_uio->uio_resid > 0) {
737 hdr_uio->uio_td = td;
738 hdr_uio->uio_rw = UIO_WRITE;
741 mh = m_uiotombuf(hdr_uio, M_WAITOK, space,
742 tls->params.max_frame_len, M_NOMAP);
745 mh = m_uiotombuf(hdr_uio, M_WAITOK,
747 hdrlen = m_length(mh, &mhtail);
750 * If header consumed all the socket buffer space,
751 * don't waste CPU cycles and jump to the end.
762 error = vn_lock(vp, LK_SHARED);
765 error = VOP_GETATTR(vp, &va, td->td_ucred);
766 if (error != 0 || off >= va.va_size) {
770 if (va.va_size != obj_size) {
771 obj_size = va.va_size;
773 omin(nbytes + offset, obj_size) : obj_size;
780 else if (space > PAGE_SIZE) {
782 * Use page boundaries when possible for large
786 space -= (PAGE_SIZE - (off & PAGE_MASK));
787 space = trunc_page(space);
789 space += (PAGE_SIZE - (off & PAGE_MASK));
792 npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE);
795 * Calculate maximum allowed number of pages for readahead
796 * at this iteration. If SF_USER_READAHEAD was set, we don't
797 * do any heuristics and use exactly the value supplied by
798 * application. Otherwise, we allow readahead up to "rem".
799 * If application wants more, let it be, but there is no
800 * reason to go above MAXPHYS. Also check against "obj_size",
801 * since vm_pager_has_page() can hint beyond EOF.
803 if (flags & SF_USER_READAHEAD) {
804 rhpages = SF_READAHEAD(flags);
806 rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) -
808 rhpages += SF_READAHEAD(flags);
810 rhpages = min(howmany(MAXPHYS, PAGE_SIZE), rhpages);
811 rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) -
814 sfio = malloc(sizeof(struct sf_io) +
815 npages * sizeof(vm_page_t), M_TEMP, M_WAITOK);
816 refcount_init(&sfio->nios, 1);
822 * This doesn't use ktls_hold() because sfio->m will
823 * also have a reference on 'tls' that will be valid
824 * for all of sfio's lifetime.
829 error = sendfile_swapin(obj, sfio, &nios, off, space, npages,
835 sendfile_iodone(sfio, NULL, 0, error);
840 * Loop and construct maximum sized mbuf chain to be bulk
841 * dumped into socket buffer.
846 * Use unmapped mbufs if enabled for TCP. Unmapped
847 * bufs are restricted to TCP as that is what has been
848 * tested. In particular, unmapped mbufs have not
849 * been tested with UNIX-domain sockets.
851 * TLS frames always require unmapped mbufs.
853 if ((mb_use_ext_pgs &&
854 so->so_proto->pr_protocol == IPPROTO_TCP)
862 max_pgs = num_pages(tls->params.max_frame_len);
865 max_pgs = MBUF_PEXT_MAX_PGS;
867 /* Start at last index, to wrap on first use. */
868 ext_pgs_idx = max_pgs - 1;
871 for (int i = 0; i < npages; i++) {
875 * If a page wasn't grabbed successfully, then
876 * trim the array. Can happen only with SF_NODISKIO.
880 fixspace(npages, i, off, &space);
890 if (ext_pgs_idx == max_pgs) {
891 m0 = mb_alloc_ext_pgs(M_WAITOK, false,
892 sendfile_free_mext_pg);
894 if (flags & SF_NOCACHE) {
895 m0->m_ext.ext_flags |=
899 * See comment below regarding
900 * ignoring SF_NOCACHE for the
903 if ((npages - i <= max_pgs) &&
904 ((off + space) & PAGE_MASK) &&
905 (rem > space || rhpages > 0))
906 m0->m_ext.ext_flags |=
910 m0->m_ext.ext_flags |=
912 m0->m_ext.ext_arg2 = sfs;
915 mtx_unlock(&sfs->mtx);
917 ext_pgs = m0->m_ext.ext_pgs;
922 /* Append to mbuf chain. */
928 ext_pgs->first_pg_off =
929 vmoff(i, off) & PAGE_MASK;
932 mtail->m_flags |= M_NOTREADY;
936 ext_pgs->pa[ext_pgs_idx] = VM_PAGE_TO_PHYS(pa[i]);
938 xfs = xfsize(i, npages, off, space);
939 ext_pgs->last_pg_len = xfs;
940 MBUF_EXT_PGS_ASSERT_SANITY(ext_pgs);
942 mtail->m_ext.ext_size += PAGE_SIZE;
947 * Get a sendfile buf. When allocating the
948 * first buffer for mbuf chain, we usually
949 * wait as long as necessary, but this wait
950 * can be interrupted. For consequent
951 * buffers, do not sleep, since several
952 * threads might exhaust the buffers and then
955 sf = sf_buf_alloc(pa[i],
956 m != NULL ? SFB_NOWAIT : SFB_CATCH);
958 SFSTAT_INC(sf_allocfail);
959 for (int j = i; j < npages; j++)
960 vm_page_unwire(pa[j], PQ_INACTIVE);
963 fixspace(npages, i, off, &space);
968 m0 = m_get(M_WAITOK, MT_DATA);
969 m0->m_ext.ext_buf = (char *)sf_buf_kva(sf);
970 m0->m_ext.ext_size = PAGE_SIZE;
971 m0->m_ext.ext_arg1 = sf;
972 m0->m_ext.ext_type = EXT_SFBUF;
973 m0->m_ext.ext_flags = EXT_FLAG_EMBREF;
974 m0->m_ext.ext_free = sendfile_free_mext;
976 * SF_NOCACHE sets the page as being freed upon send.
977 * However, we ignore it for the last page in 'space',
978 * if the page is truncated, and we got more data to
979 * send (rem > space), or if we have readahead
980 * configured (rhpages > 0).
982 if ((flags & SF_NOCACHE) &&
984 !((off + space) & PAGE_MASK) ||
985 !(rem > space || rhpages > 0)))
986 m0->m_ext.ext_flags |= EXT_FLAG_NOCACHE;
988 m0->m_ext.ext_flags |= EXT_FLAG_SYNC;
989 m0->m_ext.ext_arg2 = sfs;
992 mtx_unlock(&sfs->mtx);
994 m0->m_ext.ext_count = 1;
995 m0->m_flags |= (M_EXT | M_RDONLY);
997 m0->m_flags |= M_NOTREADY;
998 m0->m_data = (char *)sf_buf_kva(sf) +
999 (vmoff(i, off) & PAGE_MASK);
1000 m0->m_len = xfsize(i, npages, off, space);
1005 /* Append to mbuf chain. */
1016 /* Keep track of bytes processed. */
1020 /* Prepend header, if any. */
1029 KASSERT(softerr, ("%s: m NULL, no error", __func__));
1035 /* Add the buffer chain to the socket buffer. */
1036 KASSERT(m_length(m, NULL) == space + hdrlen,
1037 ("%s: mlen %u space %d hdrlen %d",
1038 __func__, m_length(m, NULL), space, hdrlen));
1040 CURVNET_SET(so->so_vnet);
1043 error = ktls_frame(m, tls, &tls_enq_cnt,
1051 * If sendfile_swapin() didn't initiate any I/Os,
1052 * which happens if all data is cached in VM, then
1053 * we can send data right now without the
1054 * PRUS_NOTREADY flag.
1058 if (tls != NULL && tls->mode == TCP_TLS_MODE_SW) {
1059 error = (*so->so_proto->pr_usrreqs->pru_send)
1060 (so, PRUS_NOTREADY, m, NULL, NULL, td);
1062 ktls_enqueue(m, so, tls_enq_cnt);
1065 error = (*so->so_proto->pr_usrreqs->pru_send)
1066 (so, 0, m, NULL, NULL, td);
1068 sfio->npages = npages;
1070 error = (*so->so_proto->pr_usrreqs->pru_send)
1071 (so, PRUS_NOTREADY, m, NULL, NULL, td);
1072 sendfile_iodone(sfio, NULL, 0, 0);
1076 m = NULL; /* pru_send always consumes */
1079 sbytes += space + hdrlen;
1089 * Send trailers. Wimp out and use writev(2).
1091 if (trl_uio != NULL) {
1092 sbunlock(&so->so_snd);
1093 error = kern_writev(td, sockfd, trl_uio);
1095 sbytes += td->td_retval[0];
1100 sbunlock(&so->so_snd);
1103 * If there was no error we have to clear td->td_retval[0]
1104 * because it may have been set by writev.
1107 td->td_retval[0] = 0;
1113 vm_object_deallocate(obj);
1122 mtx_lock(&sfs->mtx);
1123 if (sfs->count != 0)
1124 cv_wait(&sfs->cv, &sfs->mtx);
1125 KASSERT(sfs->count == 0, ("sendfile sync still busy"));
1126 cv_destroy(&sfs->cv);
1127 mtx_destroy(&sfs->mtx);
1135 if (error == ERESTART)
1142 sendfile(struct thread *td, struct sendfile_args *uap, int compat)
1144 struct sf_hdtr hdtr;
1145 struct uio *hdr_uio, *trl_uio;
1151 * File offset must be positive. If it goes beyond EOF
1152 * we send only the header/trailer and no payload data.
1154 if (uap->offset < 0)
1158 hdr_uio = trl_uio = NULL;
1160 if (uap->hdtr != NULL) {
1161 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
1164 if (hdtr.headers != NULL) {
1165 error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
1169 #ifdef COMPAT_FREEBSD4
1171 * In FreeBSD < 5.0 the nbytes to send also included
1172 * the header. If compat is specified subtract the
1173 * header size from nbytes.
1176 if (uap->nbytes > hdr_uio->uio_resid)
1177 uap->nbytes -= hdr_uio->uio_resid;
1183 if (hdtr.trailers != NULL) {
1184 error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
1191 AUDIT_ARG_FD(uap->fd);
1194 * sendfile(2) can start at any offset within a file so we require
1195 * CAP_READ+CAP_SEEK = CAP_PREAD.
1197 if ((error = fget_read(td, uap->fd, &cap_pread_rights, &fp)) != 0)
1200 error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
1201 uap->nbytes, &sbytes, uap->flags, td);
1204 if (uap->sbytes != NULL)
1205 copyout(&sbytes, uap->sbytes, sizeof(off_t));
1208 free(hdr_uio, M_IOV);
1209 free(trl_uio, M_IOV);
1216 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1217 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1219 * Send a file specified by 'fd' and starting at 'offset' to a socket
1220 * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
1221 * 0. Optionally add a header and/or trailer to the socket output. If
1222 * specified, write the total number of bytes sent into *sbytes.
1225 sys_sendfile(struct thread *td, struct sendfile_args *uap)
1228 return (sendfile(td, uap, 0));
1231 #ifdef COMPAT_FREEBSD4
1233 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
1235 struct sendfile_args args;
1239 args.offset = uap->offset;
1240 args.nbytes = uap->nbytes;
1241 args.hdtr = uap->hdtr;
1242 args.sbytes = uap->sbytes;
1243 args.flags = uap->flags;
1245 return (sendfile(td, &args, 1));
1247 #endif /* COMPAT_FREEBSD4 */