kern_sendfile.c revision 101929
1/* 2 * Copyright (c) 1982, 1986, 1989, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * sendfile(2) and related extensions: 6 * Copyright (c) 1998, David Greenman. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 37 * $FreeBSD: head/sys/kern/uipc_syscalls.c 101929 2002-08-15 17:34:03Z rwatson $ 38 */ 39 40#include "opt_compat.h" 41#include "opt_ktrace.h" 42#include "opt_mac.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/kernel.h> 47#include <sys/lock.h> 48#include <sys/mac.h> 49#include <sys/mutex.h> 50#include <sys/sysproto.h> 51#include <sys/malloc.h> 52#include <sys/filedesc.h> 53#include <sys/event.h> 54#include <sys/proc.h> 55#include <sys/fcntl.h> 56#include <sys/file.h> 57#include <sys/lock.h> 58#include <sys/mount.h> 59#include <sys/mbuf.h> 60#include <sys/protosw.h> 61#include <sys/socket.h> 62#include <sys/socketvar.h> 63#include <sys/signalvar.h> 64#include <sys/uio.h> 65#include <sys/vnode.h> 66#ifdef KTRACE 67#include <sys/ktrace.h> 68#endif 69 70#include <vm/vm.h> 71#include <vm/vm_object.h> 72#include <vm/vm_page.h> 73#include <vm/vm_pageout.h> 74#include <vm/vm_kern.h> 75#include <vm/vm_extern.h> 76 77static void sf_buf_init(void *arg); 78SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL) 79 80static int sendit(struct thread *td, int s, struct msghdr *mp, int flags); 81static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp); 82 83static int accept1(struct thread *td, struct accept_args *uap, int compat); 84static int do_sendfile(struct thread *td, struct sendfile_args *uap, int compat); 85static int getsockname1(struct thread *td, struct getsockname_args *uap, 86 int compat); 87static int getpeername1(struct thread *td, struct getpeername_args *uap, 88 int compat); 89 90/* 91 * Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the 92 * sf_freelist head with the sf_lock mutex. 93 */ 94static struct { 95 SLIST_HEAD(, sf_buf) sf_head; 96 struct mtx sf_lock; 97} sf_freelist; 98 99vm_offset_t sf_base; 100struct sf_buf *sf_bufs; 101u_int sf_buf_alloc_want; 102 103/* 104 * System call interface to the socket abstraction. 105 */ 106#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 107#define COMPAT_OLDSOCK 108#endif 109 110extern struct fileops socketops; 111 112/* 113 * MPSAFE 114 */ 115int 116socket(td, uap) 117 struct thread *td; 118 register struct socket_args /* { 119 int domain; 120 int type; 121 int protocol; 122 } */ *uap; 123{ 124 struct filedesc *fdp; 125 struct socket *so; 126 struct file *fp; 127 int fd, error; 128 129 mtx_lock(&Giant); 130 fdp = td->td_proc->p_fd; 131 error = falloc(td, &fp, &fd); 132 if (error) 133 goto done2; 134 fhold(fp); 135 error = socreate(uap->domain, &so, uap->type, uap->protocol, 136 td->td_ucred, td); 137 FILEDESC_LOCK(fdp); 138 if (error) { 139 if (fdp->fd_ofiles[fd] == fp) { 140 fdp->fd_ofiles[fd] = NULL; 141 FILEDESC_UNLOCK(fdp); 142 fdrop(fp, td); 143 } else 144 FILEDESC_UNLOCK(fdp); 145 } else { 146 fp->f_data = so; /* already has ref count */ 147 fp->f_flag = FREAD|FWRITE; 148 fp->f_ops = &socketops; 149 fp->f_type = DTYPE_SOCKET; 150 FILEDESC_UNLOCK(fdp); 151 td->td_retval[0] = fd; 152 } 153 fdrop(fp, td); 154done2: 155 mtx_unlock(&Giant); 156 return (error); 157} 158 159/* 160 * MPSAFE 161 */ 162/* ARGSUSED */ 163int 164bind(td, uap) 165 struct thread *td; 166 register struct bind_args /* { 167 int s; 168 caddr_t name; 169 int namelen; 170 } */ *uap; 171{ 172 struct socket *so; 173 struct sockaddr *sa; 174 int error; 175 176 mtx_lock(&Giant); 177 if ((error = fgetsock(td, uap->s, &so, NULL)) != 0) 178 goto done2; 179 if ((error = getsockaddr(&sa, uap->name, uap->namelen)) != 0) 180 goto done1; 181#ifdef MAC 182 error = mac_check_socket_bind(td->td_ucred, so, sa); 183 if (error) { 184 FREE(sa, M_SONAME); 185 goto done1; 186 } 187#endif 188 error = sobind(so, sa, td); 189 FREE(sa, M_SONAME); 190done1: 191 fputsock(so); 192done2: 193 mtx_unlock(&Giant); 194 return (error); 195} 196 197/* 198 * MPSAFE 199 */ 200/* ARGSUSED */ 201int 202listen(td, uap) 203 struct thread *td; 204 register struct listen_args /* { 205 int s; 206 int backlog; 207 } */ *uap; 208{ 209 struct socket *so; 210 int error; 211 212 mtx_lock(&Giant); 213 if ((error = fgetsock(td, uap->s, &so, NULL)) == 0) { 214#ifdef MAC 215 error = mac_check_socket_listen(td->td_ucred, so); 216 if (error) 217 goto done; 218#endif 219 error = solisten(so, uap->backlog, td); 220#ifdef MAC 221done: 222#endif 223 fputsock(so); 224 } 225 mtx_unlock(&Giant); 226 return(error); 227} 228 229/* 230 * accept1() 231 * MPSAFE 232 */ 233static int 234accept1(td, uap, compat) 235 struct thread *td; 236 register struct accept_args /* { 237 int s; 238 caddr_t name; 239 int *anamelen; 240 } */ *uap; 241 int compat; 242{ 243 struct filedesc *fdp; 244 struct file *nfp = NULL; 245 struct sockaddr *sa; 246 int namelen, error, s; 247 struct socket *head, *so; 248 int fd; 249 u_int fflag; 250 251 mtx_lock(&Giant); 252 fdp = td->td_proc->p_fd; 253 if (uap->name) { 254 error = copyin(uap->anamelen, &namelen, sizeof (namelen)); 255 if(error) 256 goto done2; 257 if (namelen < 0) { 258 error = EINVAL; 259 goto done2; 260 } 261 } 262 error = fgetsock(td, uap->s, &head, &fflag); 263 if (error) 264 goto done2; 265 s = splnet(); 266 if ((head->so_options & SO_ACCEPTCONN) == 0) { 267 splx(s); 268 error = EINVAL; 269 goto done; 270 } 271 if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) { 272 splx(s); 273 error = EWOULDBLOCK; 274 goto done; 275 } 276 while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) { 277 if (head->so_state & SS_CANTRCVMORE) { 278 head->so_error = ECONNABORTED; 279 break; 280 } 281 error = tsleep(&head->so_timeo, PSOCK | PCATCH, 282 "accept", 0); 283 if (error) { 284 splx(s); 285 goto done; 286 } 287 } 288 if (head->so_error) { 289 error = head->so_error; 290 head->so_error = 0; 291 splx(s); 292 goto done; 293 } 294 295 /* 296 * At this point we know that there is at least one connection 297 * ready to be accepted. Remove it from the queue prior to 298 * allocating the file descriptor for it since falloc() may 299 * block allowing another process to accept the connection 300 * instead. 301 */ 302 so = TAILQ_FIRST(&head->so_comp); 303 TAILQ_REMOVE(&head->so_comp, so, so_list); 304 head->so_qlen--; 305 306 error = falloc(td, &nfp, &fd); 307 if (error) { 308 /* 309 * Probably ran out of file descriptors. Put the 310 * unaccepted connection back onto the queue and 311 * do another wakeup so some other process might 312 * have a chance at it. 313 */ 314 TAILQ_INSERT_HEAD(&head->so_comp, so, so_list); 315 head->so_qlen++; 316 wakeup_one(&head->so_timeo); 317 splx(s); 318 goto done; 319 } 320 fhold(nfp); 321 td->td_retval[0] = fd; 322 323 /* connection has been removed from the listen queue */ 324 KNOTE(&head->so_rcv.sb_sel.si_note, 0); 325 326 so->so_state &= ~SS_COMP; 327 so->so_head = NULL; 328 if (head->so_sigio != NULL) 329 fsetown(fgetown(head->so_sigio), &so->so_sigio); 330 331 FILE_LOCK(nfp); 332 soref(so); /* file descriptor reference */ 333 nfp->f_data = so; /* nfp has ref count from falloc */ 334 nfp->f_flag = fflag; 335 nfp->f_ops = &socketops; 336 nfp->f_type = DTYPE_SOCKET; 337 FILE_UNLOCK(nfp); 338 sa = 0; 339 error = soaccept(so, &sa); 340 if (error) { 341 /* 342 * return a namelen of zero for older code which might 343 * ignore the return value from accept. 344 */ 345 if (uap->name != NULL) { 346 namelen = 0; 347 (void) copyout(&namelen, 348 uap->anamelen, sizeof(*uap->anamelen)); 349 } 350 goto noconnection; 351 } 352 if (sa == NULL) { 353 namelen = 0; 354 if (uap->name) 355 goto gotnoname; 356 splx(s); 357 error = 0; 358 goto done; 359 } 360 if (uap->name) { 361 /* check sa_len before it is destroyed */ 362 if (namelen > sa->sa_len) 363 namelen = sa->sa_len; 364#ifdef COMPAT_OLDSOCK 365 if (compat) 366 ((struct osockaddr *)sa)->sa_family = 367 sa->sa_family; 368#endif 369 error = copyout(sa, uap->name, (u_int)namelen); 370 if (!error) 371gotnoname: 372 error = copyout(&namelen, 373 uap->anamelen, sizeof (*uap->anamelen)); 374 } 375noconnection: 376 if (sa) 377 FREE(sa, M_SONAME); 378 379 /* 380 * close the new descriptor, assuming someone hasn't ripped it 381 * out from under us. 382 */ 383 if (error) { 384 FILEDESC_LOCK(fdp); 385 if (fdp->fd_ofiles[fd] == nfp) { 386 fdp->fd_ofiles[fd] = NULL; 387 FILEDESC_UNLOCK(fdp); 388 fdrop(nfp, td); 389 } else { 390 FILEDESC_UNLOCK(fdp); 391 } 392 } 393 splx(s); 394 395 /* 396 * Release explicitly held references before returning. 397 */ 398done: 399 if (nfp != NULL) 400 fdrop(nfp, td); 401 fputsock(head); 402done2: 403 mtx_unlock(&Giant); 404 return (error); 405} 406 407/* 408 * MPSAFE (accept1() is MPSAFE) 409 */ 410int 411accept(td, uap) 412 struct thread *td; 413 struct accept_args *uap; 414{ 415 416 return (accept1(td, uap, 0)); 417} 418 419#ifdef COMPAT_OLDSOCK 420/* 421 * MPSAFE (accept1() is MPSAFE) 422 */ 423int 424oaccept(td, uap) 425 struct thread *td; 426 struct accept_args *uap; 427{ 428 429 return (accept1(td, uap, 1)); 430} 431#endif /* COMPAT_OLDSOCK */ 432 433/* 434 * MPSAFE 435 */ 436/* ARGSUSED */ 437int 438connect(td, uap) 439 struct thread *td; 440 register struct connect_args /* { 441 int s; 442 caddr_t name; 443 int namelen; 444 } */ *uap; 445{ 446 struct socket *so; 447 struct sockaddr *sa; 448 int error, s; 449 450 mtx_lock(&Giant); 451 if ((error = fgetsock(td, uap->s, &so, NULL)) != 0) 452 goto done2; 453 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 454 error = EALREADY; 455 goto done1; 456 } 457 error = getsockaddr(&sa, uap->name, uap->namelen); 458 if (error) 459 goto done1; 460#ifdef MAC 461 error = mac_check_socket_connect(td->td_ucred, so, sa); 462 if (error) 463 goto bad; 464#endif 465 error = soconnect(so, sa, td); 466 if (error) 467 goto bad; 468 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 469 FREE(sa, M_SONAME); 470 error = EINPROGRESS; 471 goto done1; 472 } 473 s = splnet(); 474 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 475 error = tsleep(&so->so_timeo, PSOCK | PCATCH, "connec", 0); 476 if (error) 477 break; 478 } 479 if (error == 0) { 480 error = so->so_error; 481 so->so_error = 0; 482 } 483 splx(s); 484bad: 485 so->so_state &= ~SS_ISCONNECTING; 486 FREE(sa, M_SONAME); 487 if (error == ERESTART) 488 error = EINTR; 489done1: 490 fputsock(so); 491done2: 492 mtx_unlock(&Giant); 493 return (error); 494} 495 496/* 497 * MPSAFE 498 */ 499int 500socketpair(td, uap) 501 struct thread *td; 502 register struct socketpair_args /* { 503 int domain; 504 int type; 505 int protocol; 506 int *rsv; 507 } */ *uap; 508{ 509 register struct filedesc *fdp = td->td_proc->p_fd; 510 struct file *fp1, *fp2; 511 struct socket *so1, *so2; 512 int fd, error, sv[2]; 513 514 mtx_lock(&Giant); 515 error = socreate(uap->domain, &so1, uap->type, uap->protocol, 516 td->td_ucred, td); 517 if (error) 518 goto done2; 519 error = socreate(uap->domain, &so2, uap->type, uap->protocol, 520 td->td_ucred, td); 521 if (error) 522 goto free1; 523 error = falloc(td, &fp1, &fd); 524 if (error) 525 goto free2; 526 fhold(fp1); 527 sv[0] = fd; 528 fp1->f_data = so1; /* so1 already has ref count */ 529 error = falloc(td, &fp2, &fd); 530 if (error) 531 goto free3; 532 fhold(fp2); 533 fp2->f_data = so2; /* so2 already has ref count */ 534 sv[1] = fd; 535 error = soconnect2(so1, so2); 536 if (error) 537 goto free4; 538 if (uap->type == SOCK_DGRAM) { 539 /* 540 * Datagram socket connection is asymmetric. 541 */ 542 error = soconnect2(so2, so1); 543 if (error) 544 goto free4; 545 } 546 FILE_LOCK(fp1); 547 fp1->f_flag = FREAD|FWRITE; 548 fp1->f_ops = &socketops; 549 fp1->f_type = DTYPE_SOCKET; 550 FILE_UNLOCK(fp1); 551 FILE_LOCK(fp2); 552 fp2->f_flag = FREAD|FWRITE; 553 fp2->f_ops = &socketops; 554 fp2->f_type = DTYPE_SOCKET; 555 FILE_UNLOCK(fp2); 556 error = copyout(sv, uap->rsv, 2 * sizeof (int)); 557 fdrop(fp1, td); 558 fdrop(fp2, td); 559 goto done2; 560free4: 561 FILEDESC_LOCK(fdp); 562 if (fdp->fd_ofiles[sv[1]] == fp2) { 563 fdp->fd_ofiles[sv[1]] = NULL; 564 FILEDESC_UNLOCK(fdp); 565 fdrop(fp2, td); 566 } else 567 FILEDESC_UNLOCK(fdp); 568 fdrop(fp2, td); 569free3: 570 FILEDESC_LOCK(fdp); 571 if (fdp->fd_ofiles[sv[0]] == fp1) { 572 fdp->fd_ofiles[sv[0]] = NULL; 573 FILEDESC_UNLOCK(fdp); 574 fdrop(fp1, td); 575 } else 576 FILEDESC_UNLOCK(fdp); 577 fdrop(fp1, td); 578free2: 579 (void)soclose(so2); 580free1: 581 (void)soclose(so1); 582done2: 583 mtx_unlock(&Giant); 584 return (error); 585} 586 587static int 588sendit(td, s, mp, flags) 589 register struct thread *td; 590 int s; 591 register struct msghdr *mp; 592 int flags; 593{ 594 struct uio auio; 595 register struct iovec *iov; 596 register int i; 597 struct mbuf *control; 598 struct sockaddr *to = NULL; 599 int len, error; 600 struct socket *so; 601#ifdef KTRACE 602 struct iovec *ktriov = NULL; 603 struct uio ktruio; 604 int iovlen; 605#endif 606 607 if ((error = fgetsock(td, s, &so, NULL)) != 0) 608 return (error); 609 auio.uio_iov = mp->msg_iov; 610 auio.uio_iovcnt = mp->msg_iovlen; 611 auio.uio_segflg = UIO_USERSPACE; 612 auio.uio_rw = UIO_WRITE; 613 auio.uio_td = td; 614 auio.uio_offset = 0; /* XXX */ 615 auio.uio_resid = 0; 616 iov = mp->msg_iov; 617 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 618 if ((auio.uio_resid += iov->iov_len) < 0) { 619 error = EINVAL; 620 goto bad; 621 } 622 } 623 if (mp->msg_name) { 624 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); 625 if (error) 626 goto bad; 627 } 628 if (mp->msg_control) { 629 if (mp->msg_controllen < sizeof(struct cmsghdr) 630#ifdef COMPAT_OLDSOCK 631 && mp->msg_flags != MSG_COMPAT 632#endif 633 ) { 634 error = EINVAL; 635 goto bad; 636 } 637 error = sockargs(&control, mp->msg_control, 638 mp->msg_controllen, MT_CONTROL); 639 if (error) 640 goto bad; 641#ifdef COMPAT_OLDSOCK 642 if (mp->msg_flags == MSG_COMPAT) { 643 register struct cmsghdr *cm; 644 645 M_PREPEND(control, sizeof(*cm), M_TRYWAIT); 646 if (control == 0) { 647 error = ENOBUFS; 648 goto bad; 649 } else { 650 cm = mtod(control, struct cmsghdr *); 651 cm->cmsg_len = control->m_len; 652 cm->cmsg_level = SOL_SOCKET; 653 cm->cmsg_type = SCM_RIGHTS; 654 } 655 } 656#endif 657 } else { 658 control = 0; 659 } 660#ifdef KTRACE 661 if (KTRPOINT(td, KTR_GENIO)) { 662 iovlen = auio.uio_iovcnt * sizeof (struct iovec); 663 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 664 bcopy(auio.uio_iov, ktriov, iovlen); 665 ktruio = auio; 666 } 667#endif 668 len = auio.uio_resid; 669 error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio, 0, control, 670 flags, td); 671 if (error) { 672 if (auio.uio_resid != len && (error == ERESTART || 673 error == EINTR || error == EWOULDBLOCK)) 674 error = 0; 675 /* Generation of SIGPIPE can be controlled per socket */ 676 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE)) { 677 PROC_LOCK(td->td_proc); 678 psignal(td->td_proc, SIGPIPE); 679 PROC_UNLOCK(td->td_proc); 680 } 681 } 682 if (error == 0) 683 td->td_retval[0] = len - auio.uio_resid; 684#ifdef KTRACE 685 if (ktriov != NULL) { 686 if (error == 0) { 687 ktruio.uio_iov = ktriov; 688 ktruio.uio_resid = td->td_retval[0]; 689 ktrgenio(s, UIO_WRITE, &ktruio, error); 690 } 691 FREE(ktriov, M_TEMP); 692 } 693#endif 694bad: 695 fputsock(so); 696 if (to) 697 FREE(to, M_SONAME); 698 return (error); 699} 700 701/* 702 * MPSAFE 703 */ 704int 705sendto(td, uap) 706 struct thread *td; 707 register struct sendto_args /* { 708 int s; 709 caddr_t buf; 710 size_t len; 711 int flags; 712 caddr_t to; 713 int tolen; 714 } */ *uap; 715{ 716 struct msghdr msg; 717 struct iovec aiov; 718 int error; 719 720 msg.msg_name = uap->to; 721 msg.msg_namelen = uap->tolen; 722 msg.msg_iov = &aiov; 723 msg.msg_iovlen = 1; 724 msg.msg_control = 0; 725#ifdef COMPAT_OLDSOCK 726 msg.msg_flags = 0; 727#endif 728 aiov.iov_base = uap->buf; 729 aiov.iov_len = uap->len; 730 mtx_lock(&Giant); 731 error = sendit(td, uap->s, &msg, uap->flags); 732 mtx_unlock(&Giant); 733 return (error); 734} 735 736#ifdef COMPAT_OLDSOCK 737/* 738 * MPSAFE 739 */ 740int 741osend(td, uap) 742 struct thread *td; 743 register struct osend_args /* { 744 int s; 745 caddr_t buf; 746 int len; 747 int flags; 748 } */ *uap; 749{ 750 struct msghdr msg; 751 struct iovec aiov; 752 int error; 753 754 msg.msg_name = 0; 755 msg.msg_namelen = 0; 756 msg.msg_iov = &aiov; 757 msg.msg_iovlen = 1; 758 aiov.iov_base = uap->buf; 759 aiov.iov_len = uap->len; 760 msg.msg_control = 0; 761 msg.msg_flags = 0; 762 mtx_lock(&Giant); 763 error = sendit(td, uap->s, &msg, uap->flags); 764 mtx_unlock(&Giant); 765 return (error); 766} 767 768/* 769 * MPSAFE 770 */ 771int 772osendmsg(td, uap) 773 struct thread *td; 774 register struct osendmsg_args /* { 775 int s; 776 caddr_t msg; 777 int flags; 778 } */ *uap; 779{ 780 struct msghdr msg; 781 struct iovec aiov[UIO_SMALLIOV], *iov; 782 int error; 783 784 mtx_lock(&Giant); 785 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 786 if (error) 787 goto done2; 788 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 789 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) { 790 error = EMSGSIZE; 791 goto done2; 792 } 793 MALLOC(iov, struct iovec *, 794 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 795 M_WAITOK); 796 } else { 797 iov = aiov; 798 } 799 error = copyin(msg.msg_iov, iov, 800 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 801 if (error) 802 goto done; 803 msg.msg_flags = MSG_COMPAT; 804 msg.msg_iov = iov; 805 error = sendit(td, uap->s, &msg, uap->flags); 806done: 807 if (iov != aiov) 808 FREE(iov, M_IOV); 809done2: 810 mtx_unlock(&Giant); 811 return (error); 812} 813#endif 814 815/* 816 * MPSAFE 817 */ 818int 819sendmsg(td, uap) 820 struct thread *td; 821 register struct sendmsg_args /* { 822 int s; 823 caddr_t msg; 824 int flags; 825 } */ *uap; 826{ 827 struct msghdr msg; 828 struct iovec aiov[UIO_SMALLIOV], *iov; 829 int error; 830 831 mtx_lock(&Giant); 832 error = copyin(uap->msg, &msg, sizeof (msg)); 833 if (error) 834 goto done2; 835 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 836 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) { 837 error = EMSGSIZE; 838 goto done2; 839 } 840 MALLOC(iov, struct iovec *, 841 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 842 M_WAITOK); 843 } else { 844 iov = aiov; 845 } 846 if (msg.msg_iovlen && 847 (error = copyin(msg.msg_iov, iov, 848 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))))) 849 goto done; 850 msg.msg_iov = iov; 851#ifdef COMPAT_OLDSOCK 852 msg.msg_flags = 0; 853#endif 854 error = sendit(td, uap->s, &msg, uap->flags); 855done: 856 if (iov != aiov) 857 FREE(iov, M_IOV); 858done2: 859 mtx_unlock(&Giant); 860 return (error); 861} 862 863static int 864recvit(td, s, mp, namelenp) 865 register struct thread *td; 866 int s; 867 register struct msghdr *mp; 868 void *namelenp; 869{ 870 struct uio auio; 871 register struct iovec *iov; 872 register int i; 873 int len, error; 874 struct mbuf *m, *control = 0; 875 caddr_t ctlbuf; 876 struct socket *so; 877 struct sockaddr *fromsa = 0; 878#ifdef KTRACE 879 struct iovec *ktriov = NULL; 880 struct uio ktruio; 881 int iovlen; 882#endif 883 884 if ((error = fgetsock(td, s, &so, NULL)) != 0) 885 return (error); 886 auio.uio_iov = mp->msg_iov; 887 auio.uio_iovcnt = mp->msg_iovlen; 888 auio.uio_segflg = UIO_USERSPACE; 889 auio.uio_rw = UIO_READ; 890 auio.uio_td = td; 891 auio.uio_offset = 0; /* XXX */ 892 auio.uio_resid = 0; 893 iov = mp->msg_iov; 894 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 895 if ((auio.uio_resid += iov->iov_len) < 0) { 896 fputsock(so); 897 return (EINVAL); 898 } 899 } 900#ifdef KTRACE 901 if (KTRPOINT(td, KTR_GENIO)) { 902 iovlen = auio.uio_iovcnt * sizeof (struct iovec); 903 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 904 bcopy(auio.uio_iov, ktriov, iovlen); 905 ktruio = auio; 906 } 907#endif 908 len = auio.uio_resid; 909 error = so->so_proto->pr_usrreqs->pru_soreceive(so, &fromsa, &auio, 910 (struct mbuf **)0, mp->msg_control ? &control : (struct mbuf **)0, 911 &mp->msg_flags); 912 if (error) { 913 if (auio.uio_resid != len && (error == ERESTART || 914 error == EINTR || error == EWOULDBLOCK)) 915 error = 0; 916 } 917#ifdef KTRACE 918 if (ktriov != NULL) { 919 if (error == 0) { 920 ktruio.uio_iov = ktriov; 921 ktruio.uio_resid = len - auio.uio_resid; 922 ktrgenio(s, UIO_READ, &ktruio, error); 923 } 924 FREE(ktriov, M_TEMP); 925 } 926#endif 927 if (error) 928 goto out; 929 td->td_retval[0] = len - auio.uio_resid; 930 if (mp->msg_name) { 931 len = mp->msg_namelen; 932 if (len <= 0 || fromsa == 0) 933 len = 0; 934 else { 935#ifndef MIN 936#define MIN(a,b) ((a)>(b)?(b):(a)) 937#endif 938 /* save sa_len before it is destroyed by MSG_COMPAT */ 939 len = MIN(len, fromsa->sa_len); 940#ifdef COMPAT_OLDSOCK 941 if (mp->msg_flags & MSG_COMPAT) 942 ((struct osockaddr *)fromsa)->sa_family = 943 fromsa->sa_family; 944#endif 945 error = copyout(fromsa, mp->msg_name, (unsigned)len); 946 if (error) 947 goto out; 948 } 949 mp->msg_namelen = len; 950 if (namelenp && 951 (error = copyout(&len, namelenp, sizeof (int)))) { 952#ifdef COMPAT_OLDSOCK 953 if (mp->msg_flags & MSG_COMPAT) 954 error = 0; /* old recvfrom didn't check */ 955 else 956#endif 957 goto out; 958 } 959 } 960 if (mp->msg_control) { 961#ifdef COMPAT_OLDSOCK 962 /* 963 * We assume that old recvmsg calls won't receive access 964 * rights and other control info, esp. as control info 965 * is always optional and those options didn't exist in 4.3. 966 * If we receive rights, trim the cmsghdr; anything else 967 * is tossed. 968 */ 969 if (control && mp->msg_flags & MSG_COMPAT) { 970 if (mtod(control, struct cmsghdr *)->cmsg_level != 971 SOL_SOCKET || 972 mtod(control, struct cmsghdr *)->cmsg_type != 973 SCM_RIGHTS) { 974 mp->msg_controllen = 0; 975 goto out; 976 } 977 control->m_len -= sizeof (struct cmsghdr); 978 control->m_data += sizeof (struct cmsghdr); 979 } 980#endif 981 len = mp->msg_controllen; 982 m = control; 983 mp->msg_controllen = 0; 984 ctlbuf = mp->msg_control; 985 986 while (m && len > 0) { 987 unsigned int tocopy; 988 989 if (len >= m->m_len) 990 tocopy = m->m_len; 991 else { 992 mp->msg_flags |= MSG_CTRUNC; 993 tocopy = len; 994 } 995 996 if ((error = copyout(mtod(m, caddr_t), 997 ctlbuf, tocopy)) != 0) 998 goto out; 999 1000 ctlbuf += tocopy; 1001 len -= tocopy; 1002 m = m->m_next; 1003 } 1004 mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control; 1005 } 1006out: 1007 fputsock(so); 1008 if (fromsa) 1009 FREE(fromsa, M_SONAME); 1010 if (control) 1011 m_freem(control); 1012 return (error); 1013} 1014 1015/* 1016 * MPSAFE 1017 */ 1018int 1019recvfrom(td, uap) 1020 struct thread *td; 1021 register struct recvfrom_args /* { 1022 int s; 1023 caddr_t buf; 1024 size_t len; 1025 int flags; 1026 caddr_t from; 1027 int *fromlenaddr; 1028 } */ *uap; 1029{ 1030 struct msghdr msg; 1031 struct iovec aiov; 1032 int error; 1033 1034 mtx_lock(&Giant); 1035 if (uap->fromlenaddr) { 1036 error = copyin(uap->fromlenaddr, 1037 &msg.msg_namelen, sizeof (msg.msg_namelen)); 1038 if (error) 1039 goto done2; 1040 } else { 1041 msg.msg_namelen = 0; 1042 } 1043 msg.msg_name = uap->from; 1044 msg.msg_iov = &aiov; 1045 msg.msg_iovlen = 1; 1046 aiov.iov_base = uap->buf; 1047 aiov.iov_len = uap->len; 1048 msg.msg_control = 0; 1049 msg.msg_flags = uap->flags; 1050 error = recvit(td, uap->s, &msg, uap->fromlenaddr); 1051done2: 1052 mtx_unlock(&Giant); 1053 return(error); 1054} 1055 1056#ifdef COMPAT_OLDSOCK 1057/* 1058 * MPSAFE 1059 */ 1060int 1061orecvfrom(td, uap) 1062 struct thread *td; 1063 struct recvfrom_args *uap; 1064{ 1065 1066 uap->flags |= MSG_COMPAT; 1067 return (recvfrom(td, uap)); 1068} 1069#endif 1070 1071 1072#ifdef COMPAT_OLDSOCK 1073/* 1074 * MPSAFE 1075 */ 1076int 1077orecv(td, uap) 1078 struct thread *td; 1079 register struct orecv_args /* { 1080 int s; 1081 caddr_t buf; 1082 int len; 1083 int flags; 1084 } */ *uap; 1085{ 1086 struct msghdr msg; 1087 struct iovec aiov; 1088 int error; 1089 1090 mtx_lock(&Giant); 1091 msg.msg_name = 0; 1092 msg.msg_namelen = 0; 1093 msg.msg_iov = &aiov; 1094 msg.msg_iovlen = 1; 1095 aiov.iov_base = uap->buf; 1096 aiov.iov_len = uap->len; 1097 msg.msg_control = 0; 1098 msg.msg_flags = uap->flags; 1099 error = recvit(td, uap->s, &msg, NULL); 1100 mtx_unlock(&Giant); 1101 return (error); 1102} 1103 1104/* 1105 * Old recvmsg. This code takes advantage of the fact that the old msghdr 1106 * overlays the new one, missing only the flags, and with the (old) access 1107 * rights where the control fields are now. 1108 * 1109 * MPSAFE 1110 */ 1111int 1112orecvmsg(td, uap) 1113 struct thread *td; 1114 register struct orecvmsg_args /* { 1115 int s; 1116 struct omsghdr *msg; 1117 int flags; 1118 } */ *uap; 1119{ 1120 struct msghdr msg; 1121 struct iovec aiov[UIO_SMALLIOV], *iov; 1122 int error; 1123 1124 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 1125 if (error) 1126 return (error); 1127 1128 mtx_lock(&Giant); 1129 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 1130 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) { 1131 error = EMSGSIZE; 1132 goto done2; 1133 } 1134 MALLOC(iov, struct iovec *, 1135 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 1136 M_WAITOK); 1137 } else { 1138 iov = aiov; 1139 } 1140 msg.msg_flags = uap->flags | MSG_COMPAT; 1141 error = copyin(msg.msg_iov, iov, 1142 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 1143 if (error) 1144 goto done; 1145 msg.msg_iov = iov; 1146 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen); 1147 1148 if (msg.msg_controllen && error == 0) 1149 error = copyout(&msg.msg_controllen, 1150 &uap->msg->msg_accrightslen, sizeof (int)); 1151done: 1152 if (iov != aiov) 1153 FREE(iov, M_IOV); 1154done2: 1155 mtx_unlock(&Giant); 1156 return (error); 1157} 1158#endif 1159 1160/* 1161 * MPSAFE 1162 */ 1163int 1164recvmsg(td, uap) 1165 struct thread *td; 1166 register struct recvmsg_args /* { 1167 int s; 1168 struct msghdr *msg; 1169 int flags; 1170 } */ *uap; 1171{ 1172 struct msghdr msg; 1173 struct iovec aiov[UIO_SMALLIOV], *uiov, *iov; 1174 register int error; 1175 1176 mtx_lock(&Giant); 1177 error = copyin(uap->msg, &msg, sizeof (msg)); 1178 if (error) 1179 goto done2; 1180 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 1181 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) { 1182 error = EMSGSIZE; 1183 goto done2; 1184 } 1185 MALLOC(iov, struct iovec *, 1186 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 1187 M_WAITOK); 1188 } else { 1189 iov = aiov; 1190 } 1191#ifdef COMPAT_OLDSOCK 1192 msg.msg_flags = uap->flags &~ MSG_COMPAT; 1193#else 1194 msg.msg_flags = uap->flags; 1195#endif 1196 uiov = msg.msg_iov; 1197 msg.msg_iov = iov; 1198 error = copyin(uiov, iov, 1199 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 1200 if (error) 1201 goto done; 1202 error = recvit(td, uap->s, &msg, NULL); 1203 if (!error) { 1204 msg.msg_iov = uiov; 1205 error = copyout(&msg, uap->msg, sizeof(msg)); 1206 } 1207done: 1208 if (iov != aiov) 1209 FREE(iov, M_IOV); 1210done2: 1211 mtx_unlock(&Giant); 1212 return (error); 1213} 1214 1215/* 1216 * MPSAFE 1217 */ 1218/* ARGSUSED */ 1219int 1220shutdown(td, uap) 1221 struct thread *td; 1222 register struct shutdown_args /* { 1223 int s; 1224 int how; 1225 } */ *uap; 1226{ 1227 struct socket *so; 1228 int error; 1229 1230 mtx_lock(&Giant); 1231 if ((error = fgetsock(td, uap->s, &so, NULL)) == 0) { 1232 error = soshutdown(so, uap->how); 1233 fputsock(so); 1234 } 1235 mtx_unlock(&Giant); 1236 return(error); 1237} 1238 1239/* 1240 * MPSAFE 1241 */ 1242/* ARGSUSED */ 1243int 1244setsockopt(td, uap) 1245 struct thread *td; 1246 register struct setsockopt_args /* { 1247 int s; 1248 int level; 1249 int name; 1250 caddr_t val; 1251 int valsize; 1252 } */ *uap; 1253{ 1254 struct socket *so; 1255 struct sockopt sopt; 1256 int error; 1257 1258 if (uap->val == 0 && uap->valsize != 0) 1259 return (EFAULT); 1260 if (uap->valsize < 0) 1261 return (EINVAL); 1262 1263 mtx_lock(&Giant); 1264 if ((error = fgetsock(td, uap->s, &so, NULL)) == 0) { 1265 sopt.sopt_dir = SOPT_SET; 1266 sopt.sopt_level = uap->level; 1267 sopt.sopt_name = uap->name; 1268 sopt.sopt_val = uap->val; 1269 sopt.sopt_valsize = uap->valsize; 1270 sopt.sopt_td = td; 1271 error = sosetopt(so, &sopt); 1272 fputsock(so); 1273 } 1274 mtx_unlock(&Giant); 1275 return(error); 1276} 1277 1278/* 1279 * MPSAFE 1280 */ 1281/* ARGSUSED */ 1282int 1283getsockopt(td, uap) 1284 struct thread *td; 1285 register struct getsockopt_args /* { 1286 int s; 1287 int level; 1288 int name; 1289 caddr_t val; 1290 int *avalsize; 1291 } */ *uap; 1292{ 1293 int valsize, error; 1294 struct socket *so; 1295 struct sockopt sopt; 1296 1297 mtx_lock(&Giant); 1298 if ((error = fgetsock(td, uap->s, &so, NULL)) != 0) 1299 goto done2; 1300 if (uap->val) { 1301 error = copyin(uap->avalsize, &valsize, sizeof (valsize)); 1302 if (error) 1303 goto done1; 1304 if (valsize < 0) { 1305 error = EINVAL; 1306 goto done1; 1307 } 1308 } else { 1309 valsize = 0; 1310 } 1311 1312 sopt.sopt_dir = SOPT_GET; 1313 sopt.sopt_level = uap->level; 1314 sopt.sopt_name = uap->name; 1315 sopt.sopt_val = uap->val; 1316 sopt.sopt_valsize = (size_t)valsize; /* checked non-negative above */ 1317 sopt.sopt_td = td; 1318 1319 error = sogetopt(so, &sopt); 1320 if (error == 0) { 1321 valsize = sopt.sopt_valsize; 1322 error = copyout(&valsize, uap->avalsize, sizeof (valsize)); 1323 } 1324done1: 1325 fputsock(so); 1326done2: 1327 mtx_unlock(&Giant); 1328 return (error); 1329} 1330 1331/* 1332 * getsockname1() - Get socket name. 1333 * 1334 * MPSAFE 1335 */ 1336/* ARGSUSED */ 1337static int 1338getsockname1(td, uap, compat) 1339 struct thread *td; 1340 register struct getsockname_args /* { 1341 int fdes; 1342 caddr_t asa; 1343 int *alen; 1344 } */ *uap; 1345 int compat; 1346{ 1347 struct socket *so; 1348 struct sockaddr *sa; 1349 int len, error; 1350 1351 mtx_lock(&Giant); 1352 if ((error = fgetsock(td, uap->fdes, &so, NULL)) != 0) 1353 goto done2; 1354 error = copyin(uap->alen, &len, sizeof (len)); 1355 if (error) 1356 goto done1; 1357 if (len < 0) { 1358 error = EINVAL; 1359 goto done1; 1360 } 1361 sa = 0; 1362 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa); 1363 if (error) 1364 goto bad; 1365 if (sa == 0) { 1366 len = 0; 1367 goto gotnothing; 1368 } 1369 1370 len = MIN(len, sa->sa_len); 1371#ifdef COMPAT_OLDSOCK 1372 if (compat) 1373 ((struct osockaddr *)sa)->sa_family = sa->sa_family; 1374#endif 1375 error = copyout(sa, uap->asa, (u_int)len); 1376 if (error == 0) 1377gotnothing: 1378 error = copyout(&len, uap->alen, sizeof (len)); 1379bad: 1380 if (sa) 1381 FREE(sa, M_SONAME); 1382done1: 1383 fputsock(so); 1384done2: 1385 mtx_unlock(&Giant); 1386 return (error); 1387} 1388 1389/* 1390 * MPSAFE 1391 */ 1392int 1393getsockname(td, uap) 1394 struct thread *td; 1395 struct getsockname_args *uap; 1396{ 1397 1398 return (getsockname1(td, uap, 0)); 1399} 1400 1401#ifdef COMPAT_OLDSOCK 1402/* 1403 * MPSAFE 1404 */ 1405int 1406ogetsockname(td, uap) 1407 struct thread *td; 1408 struct getsockname_args *uap; 1409{ 1410 1411 return (getsockname1(td, uap, 1)); 1412} 1413#endif /* COMPAT_OLDSOCK */ 1414 1415/* 1416 * getpeername1() - Get name of peer for connected socket. 1417 * 1418 * MPSAFE 1419 */ 1420/* ARGSUSED */ 1421static int 1422getpeername1(td, uap, compat) 1423 struct thread *td; 1424 register struct getpeername_args /* { 1425 int fdes; 1426 caddr_t asa; 1427 int *alen; 1428 } */ *uap; 1429 int compat; 1430{ 1431 struct socket *so; 1432 struct sockaddr *sa; 1433 int len, error; 1434 1435 mtx_lock(&Giant); 1436 if ((error = fgetsock(td, uap->fdes, &so, NULL)) != 0) 1437 goto done2; 1438 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1439 error = ENOTCONN; 1440 goto done1; 1441 } 1442 error = copyin(uap->alen, &len, sizeof (len)); 1443 if (error) 1444 goto done1; 1445 if (len < 0) { 1446 error = EINVAL; 1447 goto done1; 1448 } 1449 sa = 0; 1450 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, &sa); 1451 if (error) 1452 goto bad; 1453 if (sa == 0) { 1454 len = 0; 1455 goto gotnothing; 1456 } 1457 len = MIN(len, sa->sa_len); 1458#ifdef COMPAT_OLDSOCK 1459 if (compat) 1460 ((struct osockaddr *)sa)->sa_family = 1461 sa->sa_family; 1462#endif 1463 error = copyout(sa, uap->asa, (u_int)len); 1464 if (error) 1465 goto bad; 1466gotnothing: 1467 error = copyout(&len, uap->alen, sizeof (len)); 1468bad: 1469 if (sa) 1470 FREE(sa, M_SONAME); 1471done1: 1472 fputsock(so); 1473done2: 1474 mtx_unlock(&Giant); 1475 return (error); 1476} 1477 1478/* 1479 * MPSAFE 1480 */ 1481int 1482getpeername(td, uap) 1483 struct thread *td; 1484 struct getpeername_args *uap; 1485{ 1486 1487 return (getpeername1(td, uap, 0)); 1488} 1489 1490#ifdef COMPAT_OLDSOCK 1491/* 1492 * MPSAFE 1493 */ 1494int 1495ogetpeername(td, uap) 1496 struct thread *td; 1497 struct ogetpeername_args *uap; 1498{ 1499 1500 /* XXX uap should have type `getpeername_args *' to begin with. */ 1501 return (getpeername1(td, (struct getpeername_args *)uap, 1)); 1502} 1503#endif /* COMPAT_OLDSOCK */ 1504 1505int 1506sockargs(mp, buf, buflen, type) 1507 struct mbuf **mp; 1508 caddr_t buf; 1509 int buflen, type; 1510{ 1511 register struct sockaddr *sa; 1512 register struct mbuf *m; 1513 int error; 1514 1515 if ((u_int)buflen > MLEN) { 1516#ifdef COMPAT_OLDSOCK 1517 if (type == MT_SONAME && (u_int)buflen <= 112) 1518 buflen = MLEN; /* unix domain compat. hack */ 1519 else 1520#endif 1521 return (EINVAL); 1522 } 1523 m = m_get(M_TRYWAIT, type); 1524 if (m == NULL) 1525 return (ENOBUFS); 1526 m->m_len = buflen; 1527 error = copyin(buf, mtod(m, caddr_t), (u_int)buflen); 1528 if (error) 1529 (void) m_free(m); 1530 else { 1531 *mp = m; 1532 if (type == MT_SONAME) { 1533 sa = mtod(m, struct sockaddr *); 1534 1535#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1536 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1537 sa->sa_family = sa->sa_len; 1538#endif 1539 sa->sa_len = buflen; 1540 } 1541 } 1542 return (error); 1543} 1544 1545int 1546getsockaddr(namp, uaddr, len) 1547 struct sockaddr **namp; 1548 caddr_t uaddr; 1549 size_t len; 1550{ 1551 struct sockaddr *sa; 1552 int error; 1553 1554 if (len > SOCK_MAXADDRLEN) 1555 return ENAMETOOLONG; 1556 MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK); 1557 error = copyin(uaddr, sa, len); 1558 if (error) { 1559 FREE(sa, M_SONAME); 1560 } else { 1561#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1562 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1563 sa->sa_family = sa->sa_len; 1564#endif 1565 sa->sa_len = len; 1566 *namp = sa; 1567 } 1568 return error; 1569} 1570 1571/* 1572 * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-)) 1573 */ 1574static void 1575sf_buf_init(void *arg) 1576{ 1577 int i; 1578 1579 mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF); 1580 mtx_lock(&sf_freelist.sf_lock); 1581 SLIST_INIT(&sf_freelist.sf_head); 1582 sf_base = kmem_alloc_pageable(kernel_map, nsfbufs * PAGE_SIZE); 1583 sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, 1584 M_NOWAIT | M_ZERO); 1585 for (i = 0; i < nsfbufs; i++) { 1586 sf_bufs[i].kva = sf_base + i * PAGE_SIZE; 1587 SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list); 1588 } 1589 sf_buf_alloc_want = 0; 1590 mtx_unlock(&sf_freelist.sf_lock); 1591} 1592 1593/* 1594 * Get an sf_buf from the freelist. Will block if none are available. 1595 */ 1596struct sf_buf * 1597sf_buf_alloc() 1598{ 1599 struct sf_buf *sf; 1600 int error; 1601 1602 mtx_lock(&sf_freelist.sf_lock); 1603 while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) { 1604 sf_buf_alloc_want++; 1605 error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH, 1606 "sfbufa", 0); 1607 sf_buf_alloc_want--; 1608 1609 /* 1610 * If we got a signal, don't risk going back to sleep. 1611 */ 1612 if (error) 1613 break; 1614 } 1615 if (sf != NULL) 1616 SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list); 1617 mtx_unlock(&sf_freelist.sf_lock); 1618 return (sf); 1619} 1620 1621#define dtosf(x) (&sf_bufs[((uintptr_t)(x) - (uintptr_t)sf_base) >> PAGE_SHIFT]) 1622 1623/* 1624 * Detatch mapped page and release resources back to the system. 1625 */ 1626void 1627sf_buf_free(void *addr, void *args) 1628{ 1629 struct sf_buf *sf; 1630 struct vm_page *m; 1631 1632 GIANT_REQUIRED; 1633 1634 sf = dtosf(addr); 1635 pmap_qremove((vm_offset_t)addr, 1); 1636 m = sf->m; 1637 vm_page_lock_queues(); 1638 vm_page_unwire(m, 0); 1639 /* 1640 * Check for the object going away on us. This can 1641 * happen since we don't hold a reference to it. 1642 * If so, we're responsible for freeing the page. 1643 */ 1644 if (m->wire_count == 0 && m->object == NULL) 1645 vm_page_free(m); 1646 vm_page_unlock_queues(); 1647 sf->m = NULL; 1648 mtx_lock(&sf_freelist.sf_lock); 1649 SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list); 1650 if (sf_buf_alloc_want > 0) 1651 wakeup_one(&sf_freelist); 1652 mtx_unlock(&sf_freelist.sf_lock); 1653} 1654 1655/* 1656 * sendfile(2) 1657 * 1658 * MPSAFE 1659 * 1660 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1661 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1662 * 1663 * Send a file specified by 'fd' and starting at 'offset' to a socket 1664 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1665 * nbytes == 0. Optionally add a header and/or trailer to the socket 1666 * output. If specified, write the total number of bytes sent into *sbytes. 1667 * 1668 */ 1669int 1670sendfile(struct thread *td, struct sendfile_args *uap) 1671{ 1672 1673 return (do_sendfile(td, uap, 0)); 1674} 1675 1676#ifdef COMPAT_FREEBSD4 1677int 1678freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap) 1679{ 1680 struct sendfile_args args; 1681 1682 args.fd = uap->fd; 1683 args.s = uap->s; 1684 args.offset = uap->offset; 1685 args.nbytes = uap->nbytes; 1686 args.hdtr = uap->hdtr; 1687 args.sbytes = uap->sbytes; 1688 args.flags = uap->flags; 1689 1690 return (do_sendfile(td, &args, 1)); 1691} 1692#endif /* COMPAT_FREEBSD4 */ 1693 1694static int 1695do_sendfile(struct thread *td, struct sendfile_args *uap, int compat) 1696{ 1697 struct vnode *vp; 1698 struct vm_object *obj; 1699 struct socket *so = NULL; 1700 struct mbuf *m; 1701 struct sf_buf *sf; 1702 struct vm_page *pg; 1703 struct writev_args nuap; 1704 struct sf_hdtr hdtr; 1705 off_t off, xfsize, hdtr_size, sbytes = 0; 1706 int error, s; 1707 1708 mtx_lock(&Giant); 1709 1710 hdtr_size = 0; 1711 1712 /* 1713 * The descriptor must be a regular file and have a backing VM object. 1714 */ 1715 if ((error = fgetvp_read(td, uap->fd, &vp)) != 0) 1716 goto done; 1717 if (vp->v_type != VREG || VOP_GETVOBJECT(vp, &obj) != 0) { 1718 error = EINVAL; 1719 goto done; 1720 } 1721 if ((error = fgetsock(td, uap->s, &so, NULL)) != 0) 1722 goto done; 1723 if (so->so_type != SOCK_STREAM) { 1724 error = EINVAL; 1725 goto done; 1726 } 1727 if ((so->so_state & SS_ISCONNECTED) == 0) { 1728 error = ENOTCONN; 1729 goto done; 1730 } 1731 if (uap->offset < 0) { 1732 error = EINVAL; 1733 goto done; 1734 } 1735 1736 /* 1737 * If specified, get the pointer to the sf_hdtr struct for 1738 * any headers/trailers. 1739 */ 1740 if (uap->hdtr != NULL) { 1741 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1742 if (error) 1743 goto done; 1744 /* 1745 * Send any headers. Wimp out and use writev(2). 1746 */ 1747 if (hdtr.headers != NULL) { 1748 nuap.fd = uap->s; 1749 nuap.iovp = hdtr.headers; 1750 nuap.iovcnt = hdtr.hdr_cnt; 1751 error = writev(td, &nuap); 1752 if (error) 1753 goto done; 1754 if (compat) 1755 sbytes += td->td_retval[0]; 1756 else 1757 hdtr_size += td->td_retval[0]; 1758 } 1759 } 1760 1761 /* 1762 * Protect against multiple writers to the socket. 1763 */ 1764 (void) sblock(&so->so_snd, M_WAITOK); 1765 1766 /* 1767 * Loop through the pages in the file, starting with the requested 1768 * offset. Get a file page (do I/O if necessary), map the file page 1769 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1770 * it on the socket. 1771 */ 1772 for (off = uap->offset; ; off += xfsize, sbytes += xfsize) { 1773 vm_pindex_t pindex; 1774 vm_offset_t pgoff; 1775 1776 pindex = OFF_TO_IDX(off); 1777retry_lookup: 1778 /* 1779 * Calculate the amount to transfer. Not to exceed a page, 1780 * the EOF, or the passed in nbytes. 1781 */ 1782 xfsize = obj->un_pager.vnp.vnp_size - off; 1783 if (xfsize > PAGE_SIZE) 1784 xfsize = PAGE_SIZE; 1785 pgoff = (vm_offset_t)(off & PAGE_MASK); 1786 if (PAGE_SIZE - pgoff < xfsize) 1787 xfsize = PAGE_SIZE - pgoff; 1788 if (uap->nbytes && xfsize > (uap->nbytes - sbytes)) 1789 xfsize = uap->nbytes - sbytes; 1790 if (xfsize <= 0) 1791 break; 1792 /* 1793 * Optimize the non-blocking case by looking at the socket space 1794 * before going to the extra work of constituting the sf_buf. 1795 */ 1796 if ((so->so_state & SS_NBIO) && sbspace(&so->so_snd) <= 0) { 1797 if (so->so_state & SS_CANTSENDMORE) 1798 error = EPIPE; 1799 else 1800 error = EAGAIN; 1801 sbunlock(&so->so_snd); 1802 goto done; 1803 } 1804 /* 1805 * Attempt to look up the page. 1806 * 1807 * Allocate if not found 1808 * 1809 * Wait and loop if busy. 1810 */ 1811 pg = vm_page_lookup(obj, pindex); 1812 1813 if (pg == NULL) { 1814 pg = vm_page_alloc(obj, pindex, 1815 VM_ALLOC_NORMAL | VM_ALLOC_WIRED); 1816 if (pg == NULL) { 1817 VM_WAIT; 1818 goto retry_lookup; 1819 } 1820 vm_page_lock_queues(); 1821 vm_page_wakeup(pg); 1822 } else { 1823 vm_page_lock_queues(); 1824 if (vm_page_sleep_if_busy(pg, TRUE, "sfpbsy")) 1825 goto retry_lookup; 1826 /* 1827 * Wire the page so it does not get ripped out from 1828 * under us. 1829 */ 1830 vm_page_wire(pg); 1831 } 1832 1833 /* 1834 * If page is not valid for what we need, initiate I/O 1835 */ 1836 1837 if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) { 1838 int bsize, resid; 1839 1840 /* 1841 * Ensure that our page is still around when the I/O 1842 * completes. 1843 */ 1844 vm_page_io_start(pg); 1845 vm_page_unlock_queues(); 1846 1847 /* 1848 * Get the page from backing store. 1849 */ 1850 bsize = vp->v_mount->mnt_stat.f_iosize; 1851 vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, td); 1852 error = vn_rdwr(UIO_READ, vp, NULL, MAXBSIZE, 1853 trunc_page(off), UIO_NOCOPY, IO_NODELOCKED | 1854 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1855 td->td_ucred, &resid, td); 1856 VOP_UNLOCK(vp, 0, td); 1857 vm_page_lock_queues(); 1858 vm_page_flag_clear(pg, PG_ZERO); 1859 vm_page_io_finish(pg); 1860 if (error) { 1861 vm_page_unwire(pg, 0); 1862 /* 1863 * See if anyone else might know about this page. 1864 * If not and it is not valid, then free it. 1865 */ 1866 if (pg->wire_count == 0 && pg->valid == 0 && 1867 pg->busy == 0 && !(pg->flags & PG_BUSY) && 1868 pg->hold_count == 0) { 1869 vm_page_busy(pg); 1870 vm_page_free(pg); 1871 } 1872 vm_page_unlock_queues(); 1873 sbunlock(&so->so_snd); 1874 goto done; 1875 } 1876 } 1877 vm_page_unlock_queues(); 1878 1879 /* 1880 * Get a sendfile buf. We usually wait as long as necessary, 1881 * but this wait can be interrupted. 1882 */ 1883 if ((sf = sf_buf_alloc()) == NULL) { 1884 vm_page_lock_queues(); 1885 vm_page_unwire(pg, 0); 1886 if (pg->wire_count == 0 && pg->object == NULL) 1887 vm_page_free(pg); 1888 vm_page_unlock_queues(); 1889 sbunlock(&so->so_snd); 1890 error = EINTR; 1891 goto done; 1892 } 1893 1894 /* 1895 * Allocate a kernel virtual page and insert the physical page 1896 * into it. 1897 */ 1898 sf->m = pg; 1899 pmap_qenter(sf->kva, &pg, 1); 1900 /* 1901 * Get an mbuf header and set it up as having external storage. 1902 */ 1903 MGETHDR(m, M_TRYWAIT, MT_DATA); 1904 if (m == NULL) { 1905 error = ENOBUFS; 1906 sf_buf_free((void *)sf->kva, NULL); 1907 sbunlock(&so->so_snd); 1908 goto done; 1909 } 1910 /* 1911 * Setup external storage for mbuf. 1912 */ 1913 MEXTADD(m, sf->kva, PAGE_SIZE, sf_buf_free, NULL, M_RDONLY, 1914 EXT_SFBUF); 1915 m->m_data = (char *) sf->kva + pgoff; 1916 m->m_pkthdr.len = m->m_len = xfsize; 1917 /* 1918 * Add the buffer to the socket buffer chain. 1919 */ 1920 s = splnet(); 1921retry_space: 1922 /* 1923 * Make sure that the socket is still able to take more data. 1924 * CANTSENDMORE being true usually means that the connection 1925 * was closed. so_error is true when an error was sensed after 1926 * a previous send. 1927 * The state is checked after the page mapping and buffer 1928 * allocation above since those operations may block and make 1929 * any socket checks stale. From this point forward, nothing 1930 * blocks before the pru_send (or more accurately, any blocking 1931 * results in a loop back to here to re-check). 1932 */ 1933 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1934 if (so->so_state & SS_CANTSENDMORE) { 1935 error = EPIPE; 1936 } else { 1937 error = so->so_error; 1938 so->so_error = 0; 1939 } 1940 m_freem(m); 1941 sbunlock(&so->so_snd); 1942 splx(s); 1943 goto done; 1944 } 1945 /* 1946 * Wait for socket space to become available. We do this just 1947 * after checking the connection state above in order to avoid 1948 * a race condition with sbwait(). 1949 */ 1950 if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) { 1951 if (so->so_state & SS_NBIO) { 1952 m_freem(m); 1953 sbunlock(&so->so_snd); 1954 splx(s); 1955 error = EAGAIN; 1956 goto done; 1957 } 1958 error = sbwait(&so->so_snd); 1959 /* 1960 * An error from sbwait usually indicates that we've 1961 * been interrupted by a signal. If we've sent anything 1962 * then return bytes sent, otherwise return the error. 1963 */ 1964 if (error) { 1965 m_freem(m); 1966 sbunlock(&so->so_snd); 1967 splx(s); 1968 goto done; 1969 } 1970 goto retry_space; 1971 } 1972 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, 0, 0, td); 1973 splx(s); 1974 if (error) { 1975 sbunlock(&so->so_snd); 1976 goto done; 1977 } 1978 } 1979 sbunlock(&so->so_snd); 1980 1981 /* 1982 * Send trailers. Wimp out and use writev(2). 1983 */ 1984 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1985 nuap.fd = uap->s; 1986 nuap.iovp = hdtr.trailers; 1987 nuap.iovcnt = hdtr.trl_cnt; 1988 error = writev(td, &nuap); 1989 if (error) 1990 goto done; 1991 if (compat) 1992 sbytes += td->td_retval[0]; 1993 else 1994 hdtr_size += td->td_retval[0]; 1995 } 1996 1997done: 1998 /* 1999 * If there was no error we have to clear td->td_retval[0] 2000 * because it may have been set by writev. 2001 */ 2002 if (error == 0) { 2003 td->td_retval[0] = 0; 2004 } 2005 if (uap->sbytes != NULL) { 2006 if (!compat) 2007 sbytes += hdtr_size; 2008 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 2009 } 2010 if (vp) 2011 vrele(vp); 2012 if (so) 2013 fputsock(so); 2014 mtx_unlock(&Giant); 2015 return (error); 2016} 2017