1 /* 2 * Copyright (c) 1982, 1986, 1989, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * sendfile(2) and related extensions: 6 * Copyright (c) 1998, David Greenman. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 33 * $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.65.2.17 2003/04/04 17:11:16 tegge Exp $ 34 */ 35 36 #include "opt_ktrace.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/sysproto.h> 42 #include <sys/malloc.h> 43 #include <sys/filedesc.h> 44 #include <sys/event.h> 45 #include <sys/proc.h> 46 #include <sys/fcntl.h> 47 #include <sys/file.h> 48 #include <sys/filio.h> 49 #include <sys/kern_syscall.h> 50 #include <sys/mbuf.h> 51 #include <sys/protosw.h> 52 #include <sys/sfbuf.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/socketops.h> 56 #include <sys/uio.h> 57 #include <sys/vnode.h> 58 #include <sys/lock.h> 59 #include <sys/mount.h> 60 #ifdef KTRACE 61 #include <sys/ktrace.h> 62 #endif 63 #include <vm/vm.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_page.h> 66 #include <vm/vm_pageout.h> 67 #include <vm/vm_kern.h> 68 #include <vm/vm_extern.h> 69 #include <sys/file2.h> 70 #include <sys/signalvar.h> 71 #include <sys/serialize.h> 72 73 #include <sys/thread2.h> 74 #include <sys/msgport2.h> 75 #include <sys/socketvar2.h> 76 #include <net/netmsg2.h> 77 #include <vm/vm_page2.h> 78 79 extern int use_soaccept_pred_fast; 80 extern int use_sendfile_async; 81 extern int use_soconnect_async; 82 83 /* 84 * System call interface to the socket abstraction. 85 */ 86 87 extern struct fileops socketops; 88 89 /* 90 * socket_args(int domain, int type, int protocol) 91 */ 92 int 93 kern_socket(int domain, int type, int protocol, int *res) 94 { 95 struct thread *td = curthread; 96 struct filedesc *fdp = td->td_proc->p_fd; 97 struct socket *so; 98 struct file *fp; 99 int fd, error; 100 u_int fflags = 0; 101 int oflags = 0; 102 103 KKASSERT(td->td_lwp); 104 105 if (type & SOCK_NONBLOCK) { 106 type &= ~SOCK_NONBLOCK; 107 fflags |= FNONBLOCK; 108 } 109 if (type & SOCK_CLOEXEC) { 110 type &= ~SOCK_CLOEXEC; 111 oflags |= O_CLOEXEC; 112 } 113 114 error = falloc(td->td_lwp, &fp, &fd); 115 if (error) 116 return (error); 117 error = socreate(domain, &so, type, protocol, td); 118 if (error) { 119 fsetfd(fdp, NULL, fd); 120 } else { 121 fp->f_type = DTYPE_SOCKET; 122 fp->f_flag = FREAD | FWRITE | fflags; 123 fp->f_ops = &socketops; 124 fp->f_data = so; 125 if (oflags & O_CLOEXEC) 126 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 127 *res = fd; 128 fsetfd(fdp, fp, fd); 129 } 130 fdrop(fp); 131 return (error); 132 } 133 134 /* 135 * MPALMOSTSAFE 136 */ 137 int 138 sys_socket(struct socket_args *uap) 139 { 140 int error; 141 142 error = kern_socket(uap->domain, uap->type, uap->protocol, 143 &uap->sysmsg_iresult); 144 145 return (error); 146 } 147 148 int 149 kern_bind(int s, struct sockaddr *sa) 150 { 151 struct thread *td = curthread; 152 struct file *fp; 153 int error; 154 155 error = holdsock(td, s, &fp); 156 if (error) 157 return (error); 158 error = sobind((struct socket *)fp->f_data, sa, td); 159 dropfp(td, s, fp); 160 161 return (error); 162 } 163 164 /* 165 * bind_args(int s, caddr_t name, int namelen) 166 * 167 * MPALMOSTSAFE 168 */ 169 int 170 sys_bind(struct bind_args *uap) 171 { 172 struct sockaddr *sa; 173 int error; 174 175 error = getsockaddr(&sa, uap->name, uap->namelen); 176 if (error) 177 return (error); 178 error = kern_bind(uap->s, sa); 179 kfree(sa, M_SONAME); 180 181 return (error); 182 } 183 184 int 185 kern_listen(int s, int backlog) 186 { 187 struct thread *td = curthread; 188 struct file *fp; 189 int error; 190 191 error = holdsock(td, s, &fp); 192 if (error) 193 return (error); 194 error = solisten((struct socket *)fp->f_data, backlog, td); 195 dropfp(td, s, fp); 196 197 return (error); 198 } 199 200 /* 201 * listen_args(int s, int backlog) 202 * 203 * MPALMOSTSAFE 204 */ 205 int 206 sys_listen(struct listen_args *uap) 207 { 208 int error; 209 210 error = kern_listen(uap->s, uap->backlog); 211 return (error); 212 } 213 214 /* 215 * Returns the accepted socket as well. 216 * 217 * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the 218 * pool token is absolutely required to avoid a sofree() race, 219 * as well as to avoid tailq handling races. 220 */ 221 static boolean_t 222 soaccept_predicate(struct netmsg_so_notify *msg) 223 { 224 struct socket *head = msg->base.nm_so; 225 struct socket *so; 226 227 if (head->so_error != 0) { 228 msg->base.lmsg.ms_error = head->so_error; 229 return (TRUE); 230 } 231 lwkt_getpooltoken(head); 232 if (!TAILQ_EMPTY(&head->so_comp)) { 233 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */ 234 so = TAILQ_FIRST(&head->so_comp); 235 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == SS_COMP); 236 TAILQ_REMOVE(&head->so_comp, so, so_list); 237 head->so_qlen--; 238 soclrstate(so, SS_COMP); 239 240 /* 241 * Keep a reference before clearing the so_head 242 * to avoid racing socket close in netisr. 243 */ 244 soreference(so); 245 so->so_head = NULL; 246 247 lwkt_relpooltoken(head); 248 249 msg->base.lmsg.ms_error = 0; 250 msg->base.nm_so = so; 251 return (TRUE); 252 } 253 lwkt_relpooltoken(head); 254 if (head->so_state & SS_CANTRCVMORE) { 255 msg->base.lmsg.ms_error = ECONNABORTED; 256 return (TRUE); 257 } 258 if (msg->nm_fflags & FNONBLOCK) { 259 msg->base.lmsg.ms_error = EWOULDBLOCK; 260 return (TRUE); 261 } 262 263 return (FALSE); 264 } 265 266 /* 267 * The second argument to kern_accept() is a handle to a struct sockaddr. 268 * This allows kern_accept() to return a pointer to an allocated struct 269 * sockaddr which must be freed later with FREE(). The caller must 270 * initialize *name to NULL. 271 */ 272 int 273 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res, 274 int sockflags) 275 { 276 struct thread *td = curthread; 277 struct filedesc *fdp = td->td_proc->p_fd; 278 struct file *lfp = NULL; 279 struct file *nfp = NULL; 280 struct sockaddr *sa; 281 struct socket *head, *so; 282 struct netmsg_so_notify msg; 283 int fd; 284 u_int fflag; /* type must match fp->f_flag */ 285 int error, tmp; 286 287 *res = -1; 288 if (name && namelen && *namelen < 0) 289 return (EINVAL); 290 291 error = holdsock(td, s, &lfp); 292 if (error) 293 return (error); 294 295 error = falloc(td->td_lwp, &nfp, &fd); 296 if (error) { /* Probably ran out of file descriptors. */ 297 fdrop(lfp); 298 return (error); 299 } 300 head = (struct socket *)lfp->f_data; 301 if ((head->so_options & SO_ACCEPTCONN) == 0) { 302 error = EINVAL; 303 goto done; 304 } 305 306 if (fflags & O_FBLOCKING) 307 fflags |= lfp->f_flag & ~FNONBLOCK; 308 else if (fflags & O_FNONBLOCKING) 309 fflags |= lfp->f_flag | FNONBLOCK; 310 else 311 fflags = lfp->f_flag; 312 313 if (use_soaccept_pred_fast) { 314 boolean_t pred; 315 316 /* Initialize necessary parts for soaccept_predicate() */ 317 netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL); 318 msg.nm_fflags = fflags; 319 320 lwkt_getpooltoken(head); 321 pred = soaccept_predicate(&msg); 322 lwkt_relpooltoken(head); 323 324 if (pred) { 325 error = msg.base.lmsg.ms_error; 326 if (error) 327 goto done; 328 else 329 goto accepted; 330 } 331 } 332 333 /* optimize for uniprocessor case later XXX JH */ 334 netmsg_init_abortable(&msg.base, head, &curthread->td_msgport, 335 0, netmsg_so_notify, netmsg_so_notify_doabort); 336 msg.nm_predicate = soaccept_predicate; 337 msg.nm_fflags = fflags; 338 msg.nm_etype = NM_REVENT; 339 error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH); 340 if (error) 341 goto done; 342 343 accepted: 344 /* 345 * At this point we have the connection that's ready to be accepted. 346 * 347 * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects 348 * to eat the ref and turn it into a descriptor. 349 */ 350 so = msg.base.nm_so; 351 352 fflag = lfp->f_flag; 353 354 /* connection has been removed from the listen queue */ 355 KNOTE(&head->so_rcv.ssb_kq.ki_note, 0); 356 357 if (sockflags & SOCK_KERN_NOINHERIT) { 358 fflag &= ~(FASYNC | FNONBLOCK); 359 if (sockflags & SOCK_NONBLOCK) 360 fflag |= FNONBLOCK; 361 } else { 362 if (head->so_sigio != NULL) 363 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 364 } 365 366 nfp->f_type = DTYPE_SOCKET; 367 nfp->f_flag = fflag; 368 nfp->f_ops = &socketops; 369 nfp->f_data = so; 370 /* Sync socket async state with file flags */ 371 tmp = fflag & FASYNC; 372 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL); 373 374 sa = NULL; 375 if (so->so_faddr != NULL) { 376 sa = so->so_faddr; 377 so->so_faddr = NULL; 378 379 soaccept_generic(so); 380 error = 0; 381 } else { 382 error = soaccept(so, &sa); 383 } 384 385 /* 386 * Set the returned name and namelen as applicable. Set the returned 387 * namelen to 0 for older code which might ignore the return value 388 * from accept. 389 */ 390 if (error == 0) { 391 if (sa && name && namelen) { 392 if (*namelen > sa->sa_len) 393 *namelen = sa->sa_len; 394 *name = sa; 395 } else { 396 if (sa) 397 kfree(sa, M_SONAME); 398 } 399 } 400 401 done: 402 /* 403 * If an error occured clear the reserved descriptor, else associate 404 * nfp with it. 405 * 406 * Note that *res is normally ignored if an error is returned but 407 * a syscall message will still have access to the result code. 408 */ 409 if (error) { 410 fsetfd(fdp, NULL, fd); 411 } else { 412 if (sockflags & SOCK_CLOEXEC) 413 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 414 *res = fd; 415 fsetfd(fdp, nfp, fd); 416 } 417 fdrop(nfp); 418 dropfp(td, s, lfp); 419 420 return (error); 421 } 422 423 /* 424 * accept(int s, caddr_t name, int *anamelen) 425 * 426 * MPALMOSTSAFE 427 */ 428 int 429 sys_accept(struct accept_args *uap) 430 { 431 struct sockaddr *sa = NULL; 432 int sa_len; 433 int error; 434 435 if (uap->name) { 436 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 437 if (error) 438 return (error); 439 440 error = kern_accept(uap->s, 0, &sa, &sa_len, 441 &uap->sysmsg_iresult, 0); 442 443 if (error == 0) 444 error = copyout(sa, uap->name, sa_len); 445 if (error == 0) { 446 error = copyout(&sa_len, uap->anamelen, 447 sizeof(*uap->anamelen)); 448 } 449 if (sa) 450 kfree(sa, M_SONAME); 451 } else { 452 error = kern_accept(uap->s, 0, NULL, 0, 453 &uap->sysmsg_iresult, 0); 454 } 455 return (error); 456 } 457 458 /* 459 * extaccept(int s, int fflags, caddr_t name, int *anamelen) 460 * 461 * MPALMOSTSAFE 462 */ 463 int 464 sys_extaccept(struct extaccept_args *uap) 465 { 466 struct sockaddr *sa = NULL; 467 int sa_len; 468 int error; 469 int fflags = uap->flags & O_FMASK; 470 471 if (uap->name) { 472 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 473 if (error) 474 return (error); 475 476 error = kern_accept(uap->s, fflags, &sa, &sa_len, 477 &uap->sysmsg_iresult, 0); 478 479 if (error == 0) 480 error = copyout(sa, uap->name, sa_len); 481 if (error == 0) { 482 error = copyout(&sa_len, uap->anamelen, 483 sizeof(*uap->anamelen)); 484 } 485 if (sa) 486 kfree(sa, M_SONAME); 487 } else { 488 error = kern_accept(uap->s, fflags, NULL, 0, 489 &uap->sysmsg_iresult, 0); 490 } 491 return (error); 492 } 493 494 /* 495 * accept4(int s, caddr_t name, int *anamelen, int flags) 496 * 497 * MPALMOSTSAFE 498 */ 499 int 500 sys_accept4(struct accept4_args *uap) 501 { 502 struct sockaddr *sa = NULL; 503 int sa_len; 504 int error; 505 int sockflags; 506 507 if (uap->flags & ~(SOCK_NONBLOCK | SOCK_CLOEXEC)) 508 return (EINVAL); 509 sockflags = uap->flags | SOCK_KERN_NOINHERIT; 510 511 if (uap->name) { 512 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 513 if (error) 514 return (error); 515 516 error = kern_accept(uap->s, 0, &sa, &sa_len, 517 &uap->sysmsg_iresult, sockflags); 518 519 if (error == 0) 520 error = copyout(sa, uap->name, sa_len); 521 if (error == 0) { 522 error = copyout(&sa_len, uap->anamelen, 523 sizeof(*uap->anamelen)); 524 } 525 if (sa) 526 kfree(sa, M_SONAME); 527 } else { 528 error = kern_accept(uap->s, 0, NULL, 0, 529 &uap->sysmsg_iresult, sockflags); 530 } 531 return (error); 532 } 533 534 /* 535 * Returns TRUE if predicate satisfied. 536 */ 537 static boolean_t 538 soconnected_predicate(struct netmsg_so_notify *msg) 539 { 540 struct socket *so = msg->base.nm_so; 541 542 /* check predicate */ 543 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) { 544 msg->base.lmsg.ms_error = so->so_error; 545 return (TRUE); 546 } 547 548 return (FALSE); 549 } 550 551 int 552 kern_connect(int s, int fflags, struct sockaddr *sa) 553 { 554 struct thread *td = curthread; 555 struct file *fp; 556 struct socket *so; 557 int error, interrupted = 0; 558 559 error = holdsock(td, s, &fp); 560 if (error) 561 return (error); 562 so = (struct socket *)fp->f_data; 563 564 if (fflags & O_FBLOCKING) 565 /* fflags &= ~FNONBLOCK; */; 566 else if (fflags & O_FNONBLOCKING) 567 fflags |= FNONBLOCK; 568 else 569 fflags = fp->f_flag; 570 571 if (so->so_state & SS_ISCONNECTING) { 572 error = EALREADY; 573 goto done; 574 } 575 error = soconnect(so, sa, td, use_soconnect_async ? FALSE : TRUE); 576 if (error) 577 goto bad; 578 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) { 579 error = EINPROGRESS; 580 goto done; 581 } 582 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 583 struct netmsg_so_notify msg; 584 585 netmsg_init_abortable(&msg.base, so, 586 &curthread->td_msgport, 587 0, 588 netmsg_so_notify, 589 netmsg_so_notify_doabort); 590 msg.nm_predicate = soconnected_predicate; 591 msg.nm_etype = NM_REVENT; 592 error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH); 593 if (error == EINTR || error == ERESTART) 594 interrupted = 1; 595 } 596 if (error == 0) { 597 error = so->so_error; 598 so->so_error = 0; 599 } 600 bad: 601 if (!interrupted) 602 soclrstate(so, SS_ISCONNECTING); 603 if (error == ERESTART) 604 error = EINTR; 605 done: 606 dropfp(td, s, fp); 607 608 return (error); 609 } 610 611 /* 612 * connect_args(int s, caddr_t name, int namelen) 613 * 614 * MPALMOSTSAFE 615 */ 616 int 617 sys_connect(struct connect_args *uap) 618 { 619 struct sockaddr *sa; 620 int error; 621 622 error = getsockaddr(&sa, uap->name, uap->namelen); 623 if (error) 624 return (error); 625 error = kern_connect(uap->s, 0, sa); 626 kfree(sa, M_SONAME); 627 628 return (error); 629 } 630 631 /* 632 * connect_args(int s, int fflags, caddr_t name, int namelen) 633 * 634 * MPALMOSTSAFE 635 */ 636 int 637 sys_extconnect(struct extconnect_args *uap) 638 { 639 struct sockaddr *sa; 640 int error; 641 int fflags = uap->flags & O_FMASK; 642 643 error = getsockaddr(&sa, uap->name, uap->namelen); 644 if (error) 645 return (error); 646 error = kern_connect(uap->s, fflags, sa); 647 kfree(sa, M_SONAME); 648 649 return (error); 650 } 651 652 int 653 kern_socketpair(int domain, int type, int protocol, int *sv) 654 { 655 struct thread *td = curthread; 656 struct filedesc *fdp; 657 struct file *fp1, *fp2; 658 struct socket *so1, *so2; 659 int fd1, fd2, error; 660 u_int fflags = 0; 661 int oflags = 0; 662 663 if (type & SOCK_NONBLOCK) { 664 type &= ~SOCK_NONBLOCK; 665 fflags |= FNONBLOCK; 666 } 667 if (type & SOCK_CLOEXEC) { 668 type &= ~SOCK_CLOEXEC; 669 oflags |= O_CLOEXEC; 670 } 671 672 fdp = td->td_proc->p_fd; 673 error = socreate(domain, &so1, type, protocol, td); 674 if (error) 675 return (error); 676 error = socreate(domain, &so2, type, protocol, td); 677 if (error) 678 goto free1; 679 error = falloc(td->td_lwp, &fp1, &fd1); 680 if (error) 681 goto free2; 682 sv[0] = fd1; 683 fp1->f_data = so1; 684 error = falloc(td->td_lwp, &fp2, &fd2); 685 if (error) 686 goto free3; 687 fp2->f_data = so2; 688 sv[1] = fd2; 689 error = soconnect2(so1, so2); 690 if (error) 691 goto free4; 692 if (type == SOCK_DGRAM) { 693 /* 694 * Datagram socket connection is asymmetric. 695 */ 696 error = soconnect2(so2, so1); 697 if (error) 698 goto free4; 699 } 700 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 701 fp1->f_flag = fp2->f_flag = FREAD|FWRITE|fflags; 702 fp1->f_ops = fp2->f_ops = &socketops; 703 if (oflags & O_CLOEXEC) { 704 fdp->fd_files[fd1].fileflags |= UF_EXCLOSE; 705 fdp->fd_files[fd2].fileflags |= UF_EXCLOSE; 706 } 707 fsetfd(fdp, fp1, fd1); 708 fsetfd(fdp, fp2, fd2); 709 fdrop(fp1); 710 fdrop(fp2); 711 return (error); 712 free4: 713 fsetfd(fdp, NULL, fd2); 714 fdrop(fp2); 715 free3: 716 fsetfd(fdp, NULL, fd1); 717 fdrop(fp1); 718 free2: 719 (void)soclose(so2, 0); 720 free1: 721 (void)soclose(so1, 0); 722 return (error); 723 } 724 725 /* 726 * socketpair(int domain, int type, int protocol, int *rsv) 727 */ 728 int 729 sys_socketpair(struct socketpair_args *uap) 730 { 731 int error, sockv[2]; 732 733 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); 734 735 if (error == 0) { 736 error = copyout(sockv, uap->rsv, sizeof(sockv)); 737 738 if (error != 0) { 739 kern_close(sockv[0]); 740 kern_close(sockv[1]); 741 } 742 } 743 744 return (error); 745 } 746 747 int 748 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, 749 struct mbuf *control, int flags, size_t *res) 750 { 751 struct thread *td = curthread; 752 struct lwp *lp = td->td_lwp; 753 struct proc *p = td->td_proc; 754 struct file *fp; 755 size_t len; 756 int error; 757 struct socket *so; 758 #ifdef KTRACE 759 struct iovec *ktriov = NULL; 760 struct uio ktruio; 761 #endif 762 763 error = holdsock(td, s, &fp); 764 if (error) 765 return (error); 766 #ifdef KTRACE 767 if (KTRPOINT(td, KTR_GENIO)) { 768 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 769 770 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 771 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 772 ktruio = *auio; 773 } 774 #endif 775 len = auio->uio_resid; 776 so = (struct socket *)fp->f_data; 777 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 778 if (fp->f_flag & FNONBLOCK) 779 flags |= MSG_FNONBLOCKING; 780 } 781 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); 782 if (error) { 783 if (auio->uio_resid != len && (error == ERESTART || 784 error == EINTR || error == EWOULDBLOCK)) 785 error = 0; 786 if (error == EPIPE && !(flags & MSG_NOSIGNAL) && 787 !(so->so_options & SO_NOSIGPIPE)) 788 lwpsignal(p, lp, SIGPIPE); 789 } 790 #ifdef KTRACE 791 if (ktriov != NULL) { 792 if (error == 0) { 793 ktruio.uio_iov = ktriov; 794 ktruio.uio_resid = len - auio->uio_resid; 795 ktrgenio(lp, s, UIO_WRITE, &ktruio, error); 796 } 797 kfree(ktriov, M_TEMP); 798 } 799 #endif 800 if (error == 0) 801 *res = len - auio->uio_resid; 802 dropfp(td, s, fp); 803 804 return (error); 805 } 806 807 /* 808 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen) 809 * 810 * MPALMOSTSAFE 811 */ 812 int 813 sys_sendto(struct sendto_args *uap) 814 { 815 struct thread *td = curthread; 816 struct uio auio; 817 struct iovec aiov; 818 struct sockaddr *sa = NULL; 819 int error; 820 821 if (uap->to) { 822 error = getsockaddr(&sa, uap->to, uap->tolen); 823 if (error) 824 return (error); 825 } 826 aiov.iov_base = uap->buf; 827 aiov.iov_len = uap->len; 828 auio.uio_iov = &aiov; 829 auio.uio_iovcnt = 1; 830 auio.uio_offset = 0; 831 auio.uio_resid = uap->len; 832 auio.uio_segflg = UIO_USERSPACE; 833 auio.uio_rw = UIO_WRITE; 834 auio.uio_td = td; 835 836 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags, 837 &uap->sysmsg_szresult); 838 839 if (sa) 840 kfree(sa, M_SONAME); 841 return (error); 842 } 843 844 /* 845 * sendmsg_args(int s, caddr_t msg, int flags) 846 * 847 * MPALMOSTSAFE 848 */ 849 int 850 sys_sendmsg(struct sendmsg_args *uap) 851 { 852 struct thread *td = curthread; 853 struct msghdr msg; 854 struct uio auio; 855 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 856 struct sockaddr *sa = NULL; 857 struct mbuf *control = NULL; 858 int error; 859 860 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg)); 861 if (error) 862 return (error); 863 864 /* 865 * Conditionally copyin msg.msg_name. 866 */ 867 if (msg.msg_name) { 868 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen); 869 if (error) 870 return (error); 871 } 872 873 /* 874 * Populate auio. 875 */ 876 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 877 &auio.uio_resid); 878 if (error) 879 goto cleanup2; 880 auio.uio_iov = iov; 881 auio.uio_iovcnt = msg.msg_iovlen; 882 auio.uio_offset = 0; 883 auio.uio_segflg = UIO_USERSPACE; 884 auio.uio_rw = UIO_WRITE; 885 auio.uio_td = td; 886 887 /* 888 * Conditionally copyin msg.msg_control. 889 */ 890 if (msg.msg_control) { 891 if (msg.msg_controllen < sizeof(struct cmsghdr) || 892 msg.msg_controllen > MLEN) { 893 error = EINVAL; 894 goto cleanup; 895 } 896 control = m_get(M_WAITOK, MT_CONTROL); 897 if (control == NULL) { 898 error = ENOBUFS; 899 goto cleanup; 900 } 901 control->m_len = msg.msg_controllen; 902 error = copyin(msg.msg_control, mtod(control, caddr_t), 903 msg.msg_controllen); 904 if (error) { 905 m_free(control); 906 goto cleanup; 907 } 908 } 909 910 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, 911 &uap->sysmsg_szresult); 912 913 cleanup: 914 iovec_free(&iov, aiov); 915 cleanup2: 916 if (sa) 917 kfree(sa, M_SONAME); 918 return (error); 919 } 920 921 /* 922 * kern_recvmsg() takes a handle to sa and control. If the handle is non- 923 * null, it returns a dynamically allocated struct sockaddr and an mbuf. 924 * Don't forget to FREE() and m_free() these if they are returned. 925 */ 926 int 927 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, 928 struct mbuf **control, int *flags, size_t *res) 929 { 930 struct thread *td = curthread; 931 struct file *fp; 932 size_t len; 933 int error; 934 int lflags; 935 struct socket *so; 936 #ifdef KTRACE 937 struct iovec *ktriov = NULL; 938 struct uio ktruio; 939 #endif 940 941 error = holdsock(td, s, &fp); 942 if (error) 943 return (error); 944 #ifdef KTRACE 945 if (KTRPOINT(td, KTR_GENIO)) { 946 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 947 948 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 949 bcopy(auio->uio_iov, ktriov, iovlen); 950 ktruio = *auio; 951 } 952 #endif 953 len = auio->uio_resid; 954 so = (struct socket *)fp->f_data; 955 956 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 957 if (fp->f_flag & FNONBLOCK) { 958 if (flags) { 959 *flags |= MSG_FNONBLOCKING; 960 } else { 961 lflags = MSG_FNONBLOCKING; 962 flags = &lflags; 963 } 964 } 965 } 966 967 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 968 if (error) { 969 if (auio->uio_resid != len && (error == ERESTART || 970 error == EINTR || error == EWOULDBLOCK)) 971 error = 0; 972 } 973 #ifdef KTRACE 974 if (ktriov != NULL) { 975 if (error == 0) { 976 ktruio.uio_iov = ktriov; 977 ktruio.uio_resid = len - auio->uio_resid; 978 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 979 } 980 kfree(ktriov, M_TEMP); 981 } 982 #endif 983 if (error == 0) 984 *res = len - auio->uio_resid; 985 dropfp(td, s, fp); 986 987 return (error); 988 } 989 990 /* 991 * recvfrom_args(int s, caddr_t buf, size_t len, int flags, 992 * caddr_t from, int *fromlenaddr) 993 * 994 * MPALMOSTSAFE 995 */ 996 int 997 sys_recvfrom(struct recvfrom_args *uap) 998 { 999 struct thread *td = curthread; 1000 struct uio auio; 1001 struct iovec aiov; 1002 struct sockaddr *sa = NULL; 1003 int error, fromlen; 1004 1005 if (uap->from && uap->fromlenaddr) { 1006 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); 1007 if (error) 1008 return (error); 1009 if (fromlen < 0) 1010 return (EINVAL); 1011 } else { 1012 fromlen = 0; 1013 } 1014 aiov.iov_base = uap->buf; 1015 aiov.iov_len = uap->len; 1016 auio.uio_iov = &aiov; 1017 auio.uio_iovcnt = 1; 1018 auio.uio_offset = 0; 1019 auio.uio_resid = uap->len; 1020 auio.uio_segflg = UIO_USERSPACE; 1021 auio.uio_rw = UIO_READ; 1022 auio.uio_td = td; 1023 1024 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, 1025 &uap->flags, &uap->sysmsg_szresult); 1026 1027 if (error == 0 && uap->from) { 1028 /* note: sa may still be NULL */ 1029 if (sa) { 1030 fromlen = MIN(fromlen, sa->sa_len); 1031 error = copyout(sa, uap->from, fromlen); 1032 } else { 1033 fromlen = 0; 1034 } 1035 if (error == 0) { 1036 error = copyout(&fromlen, uap->fromlenaddr, 1037 sizeof(fromlen)); 1038 } 1039 } 1040 if (sa) 1041 kfree(sa, M_SONAME); 1042 1043 return (error); 1044 } 1045 1046 /* 1047 * recvmsg_args(int s, struct msghdr *msg, int flags) 1048 * 1049 * MPALMOSTSAFE 1050 */ 1051 int 1052 sys_recvmsg(struct recvmsg_args *uap) 1053 { 1054 struct thread *td = curthread; 1055 struct msghdr msg; 1056 struct uio auio; 1057 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1058 struct mbuf *m, *control = NULL; 1059 struct sockaddr *sa = NULL; 1060 caddr_t ctlbuf; 1061 socklen_t *ufromlenp, *ucontrollenp; 1062 int error, fromlen, controllen, len, flags, *uflagsp; 1063 1064 /* 1065 * This copyin handles everything except the iovec. 1066 */ 1067 error = copyin(uap->msg, &msg, sizeof(msg)); 1068 if (error) 1069 return (error); 1070 1071 if (msg.msg_name && msg.msg_namelen < 0) 1072 return (EINVAL); 1073 if (msg.msg_control && msg.msg_controllen < 0) 1074 return (EINVAL); 1075 1076 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1077 msg_namelen)); 1078 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1079 msg_controllen)); 1080 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, 1081 msg_flags)); 1082 1083 /* 1084 * Populate auio. 1085 */ 1086 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 1087 &auio.uio_resid); 1088 if (error) 1089 return (error); 1090 auio.uio_iov = iov; 1091 auio.uio_iovcnt = msg.msg_iovlen; 1092 auio.uio_offset = 0; 1093 auio.uio_segflg = UIO_USERSPACE; 1094 auio.uio_rw = UIO_READ; 1095 auio.uio_td = td; 1096 1097 flags = uap->flags; 1098 1099 error = kern_recvmsg(uap->s, 1100 (msg.msg_name ? &sa : NULL), &auio, 1101 (msg.msg_control ? &control : NULL), &flags, 1102 &uap->sysmsg_szresult); 1103 1104 /* 1105 * Conditionally copyout the name and populate the namelen field. 1106 */ 1107 if (error == 0 && msg.msg_name) { 1108 /* note: sa may still be NULL */ 1109 if (sa != NULL) { 1110 fromlen = MIN(msg.msg_namelen, sa->sa_len); 1111 error = copyout(sa, msg.msg_name, fromlen); 1112 } else { 1113 fromlen = 0; 1114 } 1115 if (error == 0) 1116 error = copyout(&fromlen, ufromlenp, 1117 sizeof(*ufromlenp)); 1118 } 1119 1120 /* 1121 * Copyout msg.msg_control and msg.msg_controllen. 1122 */ 1123 if (error == 0 && msg.msg_control) { 1124 len = msg.msg_controllen; 1125 m = control; 1126 ctlbuf = (caddr_t)msg.msg_control; 1127 1128 while(m && len > 0) { 1129 unsigned int tocopy; 1130 1131 if (len >= m->m_len) { 1132 tocopy = m->m_len; 1133 } else { 1134 msg.msg_flags |= MSG_CTRUNC; 1135 tocopy = len; 1136 } 1137 1138 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); 1139 if (error) 1140 goto cleanup; 1141 1142 ctlbuf += tocopy; 1143 len -= tocopy; 1144 m = m->m_next; 1145 } 1146 controllen = ctlbuf - (caddr_t)msg.msg_control; 1147 error = copyout(&controllen, ucontrollenp, 1148 sizeof(*ucontrollenp)); 1149 } 1150 1151 if (error == 0) 1152 error = copyout(&flags, uflagsp, sizeof(*uflagsp)); 1153 1154 cleanup: 1155 if (sa) 1156 kfree(sa, M_SONAME); 1157 iovec_free(&iov, aiov); 1158 if (control) 1159 m_freem(control); 1160 return (error); 1161 } 1162 1163 /* 1164 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1165 * in kernel pointer instead of a userland pointer. This allows us 1166 * to manipulate socket options in the emulation code. 1167 */ 1168 int 1169 kern_setsockopt(int s, struct sockopt *sopt) 1170 { 1171 struct thread *td = curthread; 1172 struct file *fp; 1173 int error; 1174 1175 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1176 return (EFAULT); 1177 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1178 return (EINVAL); 1179 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1180 return (EINVAL); 1181 1182 error = holdsock(td, s, &fp); 1183 if (error) 1184 return (error); 1185 1186 error = sosetopt((struct socket *)fp->f_data, sopt); 1187 dropfp(td, s, fp); 1188 1189 return (error); 1190 } 1191 1192 /* 1193 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) 1194 * 1195 * MPALMOSTSAFE 1196 */ 1197 int 1198 sys_setsockopt(struct setsockopt_args *uap) 1199 { 1200 struct thread *td = curthread; 1201 struct sockopt sopt; 1202 int error; 1203 1204 sopt.sopt_level = uap->level; 1205 sopt.sopt_name = uap->name; 1206 sopt.sopt_valsize = uap->valsize; 1207 sopt.sopt_td = td; 1208 sopt.sopt_val = NULL; 1209 1210 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1211 return (EINVAL); 1212 if (uap->val) { 1213 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1214 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1215 if (error) 1216 goto out; 1217 } 1218 1219 error = kern_setsockopt(uap->s, &sopt); 1220 out: 1221 if (uap->val) 1222 kfree(sopt.sopt_val, M_TEMP); 1223 return(error); 1224 } 1225 1226 /* 1227 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1228 * in kernel pointer instead of a userland pointer. This allows us 1229 * to manipulate socket options in the emulation code. 1230 */ 1231 int 1232 kern_getsockopt(int s, struct sockopt *sopt) 1233 { 1234 struct thread *td = curthread; 1235 struct file *fp; 1236 int error; 1237 1238 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1239 return (EFAULT); 1240 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1241 return (EINVAL); 1242 1243 error = holdsock(td, s, &fp); 1244 if (error) 1245 return (error); 1246 1247 error = sogetopt((struct socket *)fp->f_data, sopt); 1248 dropfp(td, s, fp); 1249 1250 return (error); 1251 } 1252 1253 /* 1254 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) 1255 * 1256 * MPALMOSTSAFE 1257 */ 1258 int 1259 sys_getsockopt(struct getsockopt_args *uap) 1260 { 1261 struct thread *td = curthread; 1262 struct sockopt sopt; 1263 int error, valsize, valszmax, mflag = 0; 1264 1265 if (uap->val) { 1266 error = copyin(uap->avalsize, &valsize, sizeof(valsize)); 1267 if (error) 1268 return (error); 1269 } else { 1270 valsize = 0; 1271 } 1272 1273 sopt.sopt_level = uap->level; 1274 sopt.sopt_name = uap->name; 1275 sopt.sopt_valsize = valsize; 1276 sopt.sopt_td = td; 1277 sopt.sopt_val = NULL; 1278 1279 if (td->td_proc->p_ucred->cr_uid == 0) { 1280 valszmax = SOMAXOPT_SIZE0; 1281 mflag = M_NULLOK; 1282 } else { 1283 valszmax = SOMAXOPT_SIZE; 1284 } 1285 if (sopt.sopt_valsize > valszmax) /* unsigned */ 1286 return (EINVAL); 1287 if (uap->val) { 1288 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, 1289 M_WAITOK | mflag); 1290 if (sopt.sopt_val == NULL) 1291 return (ENOBUFS); 1292 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1293 if (error) 1294 goto out; 1295 } 1296 1297 error = kern_getsockopt(uap->s, &sopt); 1298 if (error) 1299 goto out; 1300 valsize = sopt.sopt_valsize; 1301 error = copyout(&valsize, uap->avalsize, sizeof(valsize)); 1302 if (error) 1303 goto out; 1304 if (uap->val) 1305 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); 1306 out: 1307 if (uap->val) 1308 kfree(sopt.sopt_val, M_TEMP); 1309 return (error); 1310 } 1311 1312 /* 1313 * The second argument to kern_getsockname() is a handle to a struct sockaddr. 1314 * This allows kern_getsockname() to return a pointer to an allocated struct 1315 * sockaddr which must be freed later with FREE(). The caller must 1316 * initialize *name to NULL. 1317 */ 1318 int 1319 kern_getsockname(int s, struct sockaddr **name, int *namelen) 1320 { 1321 struct thread *td = curthread; 1322 struct file *fp; 1323 struct socket *so; 1324 struct sockaddr *sa = NULL; 1325 int error; 1326 1327 error = holdsock(td, s, &fp); 1328 if (error) 1329 return (error); 1330 if (*namelen < 0) { 1331 fdrop(fp); 1332 return (EINVAL); 1333 } 1334 so = (struct socket *)fp->f_data; 1335 error = so_pru_sockaddr(so, &sa); 1336 if (error == 0) { 1337 if (sa == NULL) { 1338 *namelen = 0; 1339 } else { 1340 *namelen = MIN(*namelen, sa->sa_len); 1341 *name = sa; 1342 } 1343 } 1344 dropfp(td, s, fp); 1345 1346 return (error); 1347 } 1348 1349 /* 1350 * getsockname_args(int fdes, caddr_t asa, int *alen) 1351 * 1352 * Get socket name. 1353 * 1354 * MPALMOSTSAFE 1355 */ 1356 int 1357 sys_getsockname(struct getsockname_args *uap) 1358 { 1359 struct sockaddr *sa = NULL; 1360 int error, sa_len; 1361 1362 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1363 if (error) 1364 return (error); 1365 1366 error = kern_getsockname(uap->fdes, &sa, &sa_len); 1367 1368 if (error == 0) 1369 error = copyout(sa, uap->asa, sa_len); 1370 if (error == 0) 1371 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1372 if (sa) 1373 kfree(sa, M_SONAME); 1374 return (error); 1375 } 1376 1377 /* 1378 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1379 * This allows kern_getpeername() to return a pointer to an allocated struct 1380 * sockaddr which must be freed later with FREE(). The caller must 1381 * initialize *name to NULL. 1382 */ 1383 int 1384 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1385 { 1386 struct thread *td = curthread; 1387 struct file *fp; 1388 struct socket *so; 1389 struct sockaddr *sa = NULL; 1390 int error; 1391 1392 error = holdsock(td, s, &fp); 1393 if (error) 1394 return (error); 1395 if (*namelen < 0) { 1396 fdrop(fp); 1397 return (EINVAL); 1398 } 1399 so = (struct socket *)fp->f_data; 1400 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1401 fdrop(fp); 1402 return (ENOTCONN); 1403 } 1404 error = so_pru_peeraddr(so, &sa); 1405 if (error == 0) { 1406 if (sa == NULL) { 1407 *namelen = 0; 1408 } else { 1409 *namelen = MIN(*namelen, sa->sa_len); 1410 *name = sa; 1411 } 1412 } 1413 dropfp(td, s, fp); 1414 1415 return (error); 1416 } 1417 1418 /* 1419 * getpeername_args(int fdes, caddr_t asa, int *alen) 1420 * 1421 * Get name of peer for connected socket. 1422 * 1423 * MPALMOSTSAFE 1424 */ 1425 int 1426 sys_getpeername(struct getpeername_args *uap) 1427 { 1428 struct sockaddr *sa = NULL; 1429 int error, sa_len; 1430 1431 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1432 if (error) 1433 return (error); 1434 1435 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1436 1437 if (error == 0) 1438 error = copyout(sa, uap->asa, sa_len); 1439 if (error == 0) 1440 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1441 if (sa) 1442 kfree(sa, M_SONAME); 1443 return (error); 1444 } 1445 1446 int 1447 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1448 { 1449 struct sockaddr *sa; 1450 int error; 1451 1452 *namp = NULL; 1453 if (len > SOCK_MAXADDRLEN) 1454 return ENAMETOOLONG; 1455 if (len < offsetof(struct sockaddr, sa_data[0])) 1456 return EDOM; 1457 sa = kmalloc(len, M_SONAME, M_WAITOK); 1458 error = copyin(uaddr, sa, len); 1459 if (error) { 1460 kfree(sa, M_SONAME); 1461 } else { 1462 #if BYTE_ORDER != BIG_ENDIAN 1463 /* 1464 * The bind(), connect(), and sendto() syscalls were not 1465 * versioned for COMPAT_43. Thus, this check must stay. 1466 */ 1467 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1468 sa->sa_family = sa->sa_len; 1469 #endif 1470 sa->sa_len = len; 1471 *namp = sa; 1472 } 1473 return error; 1474 } 1475 1476 /* 1477 * Detach a mapped page and release resources back to the system. 1478 * We must release our wiring and if the object is ripped out 1479 * from under the vm_page we become responsible for freeing the 1480 * page. 1481 * 1482 * MPSAFE 1483 */ 1484 static void 1485 sf_buf_mfree(void *arg) 1486 { 1487 struct sf_buf *sf = arg; 1488 vm_page_t m; 1489 1490 m = sf_buf_page(sf); 1491 if (sf_buf_free(sf)) { 1492 /* sf invalid now */ 1493 vm_page_sbusy_drop(m); 1494 #if 0 1495 if (m->object == NULL && 1496 m->wire_count == 0 && 1497 (m->flags & PG_NEED_COMMIT) == 0) { 1498 vm_page_free(m); 1499 } else { 1500 vm_page_wakeup(m); 1501 } 1502 #endif 1503 } 1504 } 1505 1506 /* 1507 * sendfile(2). 1508 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1509 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1510 * 1511 * Send a file specified by 'fd' and starting at 'offset' to a socket 1512 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1513 * nbytes == 0. Optionally add a header and/or trailer to the socket 1514 * output. If specified, write the total number of bytes sent into *sbytes. 1515 * 1516 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1517 * the headers to count against the remaining bytes to be sent from 1518 * the file descriptor. We may wish to implement a compatibility syscall 1519 * in the future. 1520 * 1521 * MPALMOSTSAFE 1522 */ 1523 int 1524 sys_sendfile(struct sendfile_args *uap) 1525 { 1526 struct thread *td = curthread; 1527 struct file *fp; 1528 struct vnode *vp = NULL; 1529 struct sf_hdtr hdtr; 1530 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1531 struct uio auio; 1532 struct mbuf *mheader = NULL; 1533 size_t hbytes = 0; 1534 size_t tbytes; 1535 off_t hdtr_size = 0; 1536 off_t sbytes; 1537 int error; 1538 1539 /* 1540 * Do argument checking. Must be a regular file in, stream 1541 * type and connected socket out, positive offset. 1542 */ 1543 fp = holdfp(td, uap->fd, FREAD); 1544 if (fp == NULL) { 1545 return (EBADF); 1546 } 1547 if (fp->f_type != DTYPE_VNODE) { 1548 fdrop(fp); 1549 return (EINVAL); 1550 } 1551 vp = (struct vnode *)fp->f_data; 1552 vref(vp); 1553 dropfp(td, uap->fd, fp); 1554 1555 /* 1556 * If specified, get the pointer to the sf_hdtr struct for 1557 * any headers/trailers. 1558 */ 1559 if (uap->hdtr) { 1560 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1561 if (error) 1562 goto done; 1563 /* 1564 * Send any headers. 1565 */ 1566 if (hdtr.headers) { 1567 error = iovec_copyin(hdtr.headers, &iov, aiov, 1568 hdtr.hdr_cnt, &hbytes); 1569 if (error) 1570 goto done; 1571 auio.uio_iov = iov; 1572 auio.uio_iovcnt = hdtr.hdr_cnt; 1573 auio.uio_offset = 0; 1574 auio.uio_segflg = UIO_USERSPACE; 1575 auio.uio_rw = UIO_WRITE; 1576 auio.uio_td = td; 1577 auio.uio_resid = hbytes; 1578 1579 mheader = m_uiomove(&auio); 1580 1581 iovec_free(&iov, aiov); 1582 if (mheader == NULL) 1583 goto done; 1584 } 1585 } 1586 1587 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1588 &sbytes, uap->flags); 1589 if (error) 1590 goto done; 1591 1592 /* 1593 * Send trailers. Wimp out and use writev(2). 1594 */ 1595 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1596 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1597 hdtr.trl_cnt, &auio.uio_resid); 1598 if (error) 1599 goto done; 1600 auio.uio_iov = iov; 1601 auio.uio_iovcnt = hdtr.trl_cnt; 1602 auio.uio_offset = 0; 1603 auio.uio_segflg = UIO_USERSPACE; 1604 auio.uio_rw = UIO_WRITE; 1605 auio.uio_td = td; 1606 1607 tbytes = 0; /* avoid gcc warnings */ 1608 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1609 1610 iovec_free(&iov, aiov); 1611 if (error) 1612 goto done; 1613 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1614 } 1615 1616 done: 1617 if (vp) 1618 vrele(vp); 1619 if (uap->sbytes != NULL) { 1620 sbytes += hdtr_size; 1621 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1622 } 1623 return (error); 1624 } 1625 1626 int 1627 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1628 struct mbuf *mheader, off_t *sbytes, int flags) 1629 { 1630 struct thread *td = curthread; 1631 struct vm_object *obj; 1632 struct socket *so; 1633 struct file *fp; 1634 struct mbuf *m, *mp; 1635 struct sf_buf *sf; 1636 struct vm_page *pg; 1637 off_t off, xfsize, xbytes; 1638 off_t hbytes = 0; 1639 int error = 0; 1640 1641 if (vp->v_type != VREG) { 1642 error = EINVAL; 1643 goto done0; 1644 } 1645 if ((obj = vp->v_object) == NULL) { 1646 error = EINVAL; 1647 goto done0; 1648 } 1649 error = holdsock(td, sfd, &fp); 1650 if (error) 1651 goto done0; 1652 so = (struct socket *)fp->f_data; 1653 if (so->so_type != SOCK_STREAM) { 1654 error = EINVAL; 1655 goto done1; 1656 } 1657 if ((so->so_state & SS_ISCONNECTED) == 0) { 1658 error = ENOTCONN; 1659 goto done1; 1660 } 1661 if (offset < 0) { 1662 error = EINVAL; 1663 goto done1; 1664 } 1665 1666 /* 1667 * preallocation is required for asynchronous passing of mbufs, 1668 * otherwise we can wind up building up an infinite number of 1669 * mbufs during the asynchronous latency. 1670 */ 1671 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1672 error = EINVAL; 1673 goto done1; 1674 } 1675 1676 *sbytes = 0; 1677 xbytes = 0; 1678 1679 /* 1680 * Protect against multiple writers to the socket. 1681 * We need at least a shared lock on the VM object 1682 */ 1683 ssb_lock(&so->so_snd, M_WAITOK); 1684 vm_object_hold_shared(obj); 1685 1686 /* 1687 * Loop through the pages in the file, starting with the requested 1688 * offset. Get a file page (do I/O if necessary), map the file page 1689 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1690 * it on the socket. 1691 */ 1692 for (off = offset; ; 1693 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1694 vm_pindex_t pindex; 1695 vm_offset_t pgoff; 1696 long space; 1697 int loops; 1698 1699 pindex = OFF_TO_IDX(off); 1700 loops = 0; 1701 1702 retry_lookup: 1703 /* 1704 * Calculate the amount to transfer. Not to exceed a page, 1705 * the EOF, or the passed in nbytes. 1706 */ 1707 xfsize = vp->v_filesize - off; 1708 if (xfsize > PAGE_SIZE) 1709 xfsize = PAGE_SIZE; 1710 pgoff = (vm_offset_t)(off & PAGE_MASK); 1711 if (PAGE_SIZE - pgoff < xfsize) 1712 xfsize = PAGE_SIZE - pgoff; 1713 if (nbytes && xfsize > (nbytes - xbytes)) 1714 xfsize = nbytes - xbytes; 1715 if (xfsize <= 0) 1716 break; 1717 /* 1718 * Optimize the non-blocking case by looking at the socket space 1719 * before going to the extra work of constituting the sf_buf. 1720 */ 1721 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1722 space = ssb_space_prealloc(&so->so_snd); 1723 else 1724 space = ssb_space(&so->so_snd); 1725 1726 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1727 if (so->so_state & SS_CANTSENDMORE) 1728 error = EPIPE; 1729 else 1730 error = EAGAIN; 1731 goto done; 1732 } 1733 1734 /* 1735 * Attempt to look up the page. 1736 * 1737 * Try to find the data using a shared vm_object token and 1738 * vm_page_lookup_sbusy_try() first. 1739 * 1740 * If data is missing, use a UIO_NOCOPY VOP_READ to load 1741 * the missing data and loop back up. We avoid all sorts 1742 * of problems by not trying to hold onto the page during 1743 * the I/O. 1744 * 1745 * NOTE: The soft-busy will temporary block filesystem 1746 * truncation operations when a file is removed 1747 * while the sendfile is running. 1748 */ 1749 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize); 1750 if (pg == NULL) { 1751 struct uio auio; 1752 struct iovec aiov; 1753 int bsize; 1754 1755 if (++loops > 100000) { 1756 kprintf("sendfile: VOP operation failed " 1757 "to retain page\n"); 1758 error = EIO; 1759 goto done; 1760 } 1761 1762 vm_object_drop(obj); 1763 bsize = vp->v_mount->mnt_stat.f_iosize; 1764 auio.uio_iov = &aiov; 1765 auio.uio_iovcnt = 1; 1766 aiov.iov_base = 0; 1767 aiov.iov_len = MAXBSIZE; 1768 auio.uio_resid = MAXBSIZE; 1769 auio.uio_offset = trunc_page(off); 1770 auio.uio_segflg = UIO_NOCOPY; 1771 auio.uio_rw = UIO_READ; 1772 auio.uio_td = td; 1773 1774 vn_lock(vp, LK_SHARED | LK_RETRY); 1775 error = VOP_READ(vp, &auio, 1776 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1777 td->td_ucred); 1778 vn_unlock(vp); 1779 vm_object_hold_shared(obj); 1780 1781 if (error) 1782 goto done; 1783 goto retry_lookup; 1784 } 1785 1786 /* 1787 * Get a sendfile buf. We usually wait as long as necessary, 1788 * but this wait can be interrupted. 1789 */ 1790 if ((sf = sf_buf_alloc(pg)) == NULL) { 1791 vm_page_sbusy_drop(pg); 1792 /* vm_page_try_to_free(pg); */ 1793 error = EINTR; 1794 goto done; 1795 } 1796 1797 /* 1798 * Get an mbuf header and set it up as having external storage. 1799 */ 1800 MGETHDR(m, M_WAITOK, MT_DATA); 1801 if (m == NULL) { 1802 error = ENOBUFS; 1803 vm_page_sbusy_drop(pg); 1804 /* vm_page_try_to_free(pg); */ 1805 sf_buf_free(sf); 1806 goto done; 1807 } 1808 1809 m->m_ext.ext_free = sf_buf_mfree; 1810 m->m_ext.ext_ref = sf_buf_ref; 1811 m->m_ext.ext_arg = sf; 1812 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1813 m->m_ext.ext_size = PAGE_SIZE; 1814 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1815 m->m_flags |= M_EXT; 1816 m->m_pkthdr.len = m->m_len = xfsize; 1817 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1818 1819 if (mheader != NULL) { 1820 hbytes = mheader->m_pkthdr.len; 1821 mheader->m_pkthdr.len += m->m_pkthdr.len; 1822 m_cat(mheader, m); 1823 m = mheader; 1824 mheader = NULL; 1825 } else { 1826 hbytes = 0; 1827 } 1828 1829 /* 1830 * Add the buffer to the socket buffer chain. 1831 */ 1832 crit_enter(); 1833 retry_space: 1834 /* 1835 * Make sure that the socket is still able to take more data. 1836 * CANTSENDMORE being true usually means that the connection 1837 * was closed. so_error is true when an error was sensed after 1838 * a previous send. 1839 * The state is checked after the page mapping and buffer 1840 * allocation above since those operations may block and make 1841 * any socket checks stale. From this point forward, nothing 1842 * blocks before the pru_send (or more accurately, any blocking 1843 * results in a loop back to here to re-check). 1844 */ 1845 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1846 if (so->so_state & SS_CANTSENDMORE) { 1847 error = EPIPE; 1848 } else { 1849 error = so->so_error; 1850 so->so_error = 0; 1851 } 1852 m_freem(m); 1853 crit_exit(); 1854 goto done; 1855 } 1856 /* 1857 * Wait for socket space to become available. We do this just 1858 * after checking the connection state above in order to avoid 1859 * a race condition with ssb_wait(). 1860 */ 1861 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1862 space = ssb_space_prealloc(&so->so_snd); 1863 else 1864 space = ssb_space(&so->so_snd); 1865 1866 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1867 if (fp->f_flag & FNONBLOCK) { 1868 m_freem(m); 1869 crit_exit(); 1870 error = EAGAIN; 1871 goto done; 1872 } 1873 error = ssb_wait(&so->so_snd); 1874 /* 1875 * An error from ssb_wait usually indicates that we've 1876 * been interrupted by a signal. If we've sent anything 1877 * then return bytes sent, otherwise return the error. 1878 */ 1879 if (error) { 1880 m_freem(m); 1881 crit_exit(); 1882 goto done; 1883 } 1884 goto retry_space; 1885 } 1886 1887 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1888 for (mp = m; mp != NULL; mp = mp->m_next) 1889 ssb_preallocstream(&so->so_snd, mp); 1890 } 1891 if (use_sendfile_async) 1892 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1893 else 1894 error = so_pru_send(so, 0, m, NULL, NULL, td); 1895 1896 crit_exit(); 1897 if (error) 1898 goto done; 1899 } 1900 if (mheader != NULL) { 1901 *sbytes += mheader->m_pkthdr.len; 1902 1903 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1904 for (mp = mheader; mp != NULL; mp = mp->m_next) 1905 ssb_preallocstream(&so->so_snd, mp); 1906 } 1907 if (use_sendfile_async) 1908 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1909 else 1910 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1911 1912 mheader = NULL; 1913 } 1914 done: 1915 vm_object_drop(obj); 1916 ssb_unlock(&so->so_snd); 1917 done1: 1918 dropfp(td, sfd, fp); 1919 done0: 1920 if (mheader != NULL) 1921 m_freem(mheader); 1922 return (error); 1923 } 1924