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 proc *p = td->td_proc; 153 struct file *fp; 154 int error; 155 156 KKASSERT(p); 157 error = holdsock(p->p_fd, s, &fp); 158 if (error) 159 return (error); 160 error = sobind((struct socket *)fp->f_data, sa, td); 161 fdrop(fp); 162 return (error); 163 } 164 165 /* 166 * bind_args(int s, caddr_t name, int namelen) 167 * 168 * MPALMOSTSAFE 169 */ 170 int 171 sys_bind(struct bind_args *uap) 172 { 173 struct sockaddr *sa; 174 int error; 175 176 error = getsockaddr(&sa, uap->name, uap->namelen); 177 if (error) 178 return (error); 179 error = kern_bind(uap->s, sa); 180 kfree(sa, M_SONAME); 181 182 return (error); 183 } 184 185 int 186 kern_listen(int s, int backlog) 187 { 188 struct thread *td = curthread; 189 struct proc *p = td->td_proc; 190 struct file *fp; 191 int error; 192 193 KKASSERT(p); 194 error = holdsock(p->p_fd, s, &fp); 195 if (error) 196 return (error); 197 error = solisten((struct socket *)fp->f_data, backlog, td); 198 fdrop(fp); 199 return(error); 200 } 201 202 /* 203 * listen_args(int s, int backlog) 204 * 205 * MPALMOSTSAFE 206 */ 207 int 208 sys_listen(struct listen_args *uap) 209 { 210 int error; 211 212 error = kern_listen(uap->s, uap->backlog); 213 return (error); 214 } 215 216 /* 217 * Returns the accepted socket as well. 218 * 219 * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the 220 * pool token is absolutely required to avoid a sofree() race, 221 * as well as to avoid tailq handling races. 222 */ 223 static boolean_t 224 soaccept_predicate(struct netmsg_so_notify *msg) 225 { 226 struct socket *head = msg->base.nm_so; 227 struct socket *so; 228 229 if (head->so_error != 0) { 230 msg->base.lmsg.ms_error = head->so_error; 231 return (TRUE); 232 } 233 lwkt_getpooltoken(head); 234 if (!TAILQ_EMPTY(&head->so_comp)) { 235 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */ 236 so = TAILQ_FIRST(&head->so_comp); 237 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == SS_COMP); 238 TAILQ_REMOVE(&head->so_comp, so, so_list); 239 head->so_qlen--; 240 soclrstate(so, SS_COMP); 241 242 /* 243 * Keep a reference before clearing the so_head 244 * to avoid racing socket close in netisr. 245 */ 246 soreference(so); 247 so->so_head = NULL; 248 249 lwkt_relpooltoken(head); 250 251 msg->base.lmsg.ms_error = 0; 252 msg->base.nm_so = so; 253 return (TRUE); 254 } 255 lwkt_relpooltoken(head); 256 if (head->so_state & SS_CANTRCVMORE) { 257 msg->base.lmsg.ms_error = ECONNABORTED; 258 return (TRUE); 259 } 260 if (msg->nm_fflags & FNONBLOCK) { 261 msg->base.lmsg.ms_error = EWOULDBLOCK; 262 return (TRUE); 263 } 264 265 return (FALSE); 266 } 267 268 /* 269 * The second argument to kern_accept() is a handle to a struct sockaddr. 270 * This allows kern_accept() to return a pointer to an allocated struct 271 * sockaddr which must be freed later with FREE(). The caller must 272 * initialize *name to NULL. 273 */ 274 int 275 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res, 276 int sockflags) 277 { 278 struct thread *td = curthread; 279 struct filedesc *fdp = td->td_proc->p_fd; 280 struct file *lfp = NULL; 281 struct file *nfp = NULL; 282 struct sockaddr *sa; 283 struct socket *head, *so; 284 struct netmsg_so_notify msg; 285 int fd; 286 u_int fflag; /* type must match fp->f_flag */ 287 int error, tmp; 288 289 *res = -1; 290 if (name && namelen && *namelen < 0) 291 return (EINVAL); 292 293 error = holdsock(td->td_proc->p_fd, s, &lfp); 294 if (error) 295 return (error); 296 297 error = falloc(td->td_lwp, &nfp, &fd); 298 if (error) { /* Probably ran out of file descriptors. */ 299 fdrop(lfp); 300 return (error); 301 } 302 head = (struct socket *)lfp->f_data; 303 if ((head->so_options & SO_ACCEPTCONN) == 0) { 304 error = EINVAL; 305 goto done; 306 } 307 308 if (fflags & O_FBLOCKING) 309 fflags |= lfp->f_flag & ~FNONBLOCK; 310 else if (fflags & O_FNONBLOCKING) 311 fflags |= lfp->f_flag | FNONBLOCK; 312 else 313 fflags = lfp->f_flag; 314 315 if (use_soaccept_pred_fast) { 316 boolean_t pred; 317 318 /* Initialize necessary parts for soaccept_predicate() */ 319 netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL); 320 msg.nm_fflags = fflags; 321 322 lwkt_getpooltoken(head); 323 pred = soaccept_predicate(&msg); 324 lwkt_relpooltoken(head); 325 326 if (pred) { 327 error = msg.base.lmsg.ms_error; 328 if (error) 329 goto done; 330 else 331 goto accepted; 332 } 333 } 334 335 /* optimize for uniprocessor case later XXX JH */ 336 netmsg_init_abortable(&msg.base, head, &curthread->td_msgport, 337 0, netmsg_so_notify, netmsg_so_notify_doabort); 338 msg.nm_predicate = soaccept_predicate; 339 msg.nm_fflags = fflags; 340 msg.nm_etype = NM_REVENT; 341 error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH); 342 if (error) 343 goto done; 344 345 accepted: 346 /* 347 * At this point we have the connection that's ready to be accepted. 348 * 349 * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects 350 * to eat the ref and turn it into a descriptor. 351 */ 352 so = msg.base.nm_so; 353 354 fflag = lfp->f_flag; 355 356 /* connection has been removed from the listen queue */ 357 KNOTE(&head->so_rcv.ssb_kq.ki_note, 0); 358 359 if (sockflags & SOCK_KERN_NOINHERIT) { 360 fflag &= ~(FASYNC | FNONBLOCK); 361 if (sockflags & SOCK_NONBLOCK) 362 fflag |= FNONBLOCK; 363 } else { 364 if (head->so_sigio != NULL) 365 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 366 } 367 368 nfp->f_type = DTYPE_SOCKET; 369 nfp->f_flag = fflag; 370 nfp->f_ops = &socketops; 371 nfp->f_data = so; 372 /* Sync socket async state with file flags */ 373 tmp = fflag & FASYNC; 374 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL); 375 376 sa = NULL; 377 if (so->so_faddr != NULL) { 378 sa = so->so_faddr; 379 so->so_faddr = NULL; 380 381 soaccept_generic(so); 382 error = 0; 383 } else { 384 error = soaccept(so, &sa); 385 } 386 387 /* 388 * Set the returned name and namelen as applicable. Set the returned 389 * namelen to 0 for older code which might ignore the return value 390 * from accept. 391 */ 392 if (error == 0) { 393 if (sa && name && namelen) { 394 if (*namelen > sa->sa_len) 395 *namelen = sa->sa_len; 396 *name = sa; 397 } else { 398 if (sa) 399 kfree(sa, M_SONAME); 400 } 401 } 402 403 done: 404 /* 405 * If an error occured clear the reserved descriptor, else associate 406 * nfp with it. 407 * 408 * Note that *res is normally ignored if an error is returned but 409 * a syscall message will still have access to the result code. 410 */ 411 if (error) { 412 fsetfd(fdp, NULL, fd); 413 } else { 414 if (sockflags & SOCK_CLOEXEC) 415 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 416 *res = fd; 417 fsetfd(fdp, nfp, fd); 418 } 419 fdrop(nfp); 420 fdrop(lfp); 421 return (error); 422 } 423 424 /* 425 * accept(int s, caddr_t name, int *anamelen) 426 * 427 * MPALMOSTSAFE 428 */ 429 int 430 sys_accept(struct accept_args *uap) 431 { 432 struct sockaddr *sa = NULL; 433 int sa_len; 434 int error; 435 436 if (uap->name) { 437 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 438 if (error) 439 return (error); 440 441 error = kern_accept(uap->s, 0, &sa, &sa_len, 442 &uap->sysmsg_iresult, 0); 443 444 if (error == 0) 445 error = copyout(sa, uap->name, sa_len); 446 if (error == 0) { 447 error = copyout(&sa_len, uap->anamelen, 448 sizeof(*uap->anamelen)); 449 } 450 if (sa) 451 kfree(sa, M_SONAME); 452 } else { 453 error = kern_accept(uap->s, 0, NULL, 0, 454 &uap->sysmsg_iresult, 0); 455 } 456 return (error); 457 } 458 459 /* 460 * extaccept(int s, int fflags, caddr_t name, int *anamelen) 461 * 462 * MPALMOSTSAFE 463 */ 464 int 465 sys_extaccept(struct extaccept_args *uap) 466 { 467 struct sockaddr *sa = NULL; 468 int sa_len; 469 int error; 470 int fflags = uap->flags & O_FMASK; 471 472 if (uap->name) { 473 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 474 if (error) 475 return (error); 476 477 error = kern_accept(uap->s, fflags, &sa, &sa_len, 478 &uap->sysmsg_iresult, 0); 479 480 if (error == 0) 481 error = copyout(sa, uap->name, sa_len); 482 if (error == 0) { 483 error = copyout(&sa_len, uap->anamelen, 484 sizeof(*uap->anamelen)); 485 } 486 if (sa) 487 kfree(sa, M_SONAME); 488 } else { 489 error = kern_accept(uap->s, fflags, NULL, 0, 490 &uap->sysmsg_iresult, 0); 491 } 492 return (error); 493 } 494 495 /* 496 * accept4(int s, caddr_t name, int *anamelen, int flags) 497 * 498 * MPALMOSTSAFE 499 */ 500 int 501 sys_accept4(struct accept4_args *uap) 502 { 503 struct sockaddr *sa = NULL; 504 int sa_len; 505 int error; 506 int sockflags; 507 508 if (uap->flags & ~(SOCK_NONBLOCK | SOCK_CLOEXEC)) 509 return (EINVAL); 510 sockflags = uap->flags | SOCK_KERN_NOINHERIT; 511 512 if (uap->name) { 513 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 514 if (error) 515 return (error); 516 517 error = kern_accept(uap->s, 0, &sa, &sa_len, 518 &uap->sysmsg_iresult, sockflags); 519 520 if (error == 0) 521 error = copyout(sa, uap->name, sa_len); 522 if (error == 0) { 523 error = copyout(&sa_len, uap->anamelen, 524 sizeof(*uap->anamelen)); 525 } 526 if (sa) 527 kfree(sa, M_SONAME); 528 } else { 529 error = kern_accept(uap->s, 0, NULL, 0, 530 &uap->sysmsg_iresult, sockflags); 531 } 532 return (error); 533 } 534 535 /* 536 * Returns TRUE if predicate satisfied. 537 */ 538 static boolean_t 539 soconnected_predicate(struct netmsg_so_notify *msg) 540 { 541 struct socket *so = msg->base.nm_so; 542 543 /* check predicate */ 544 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) { 545 msg->base.lmsg.ms_error = so->so_error; 546 return (TRUE); 547 } 548 549 return (FALSE); 550 } 551 552 int 553 kern_connect(int s, int fflags, struct sockaddr *sa) 554 { 555 struct thread *td = curthread; 556 struct proc *p = td->td_proc; 557 struct file *fp; 558 struct socket *so; 559 int error, interrupted = 0; 560 561 error = holdsock(p->p_fd, s, &fp); 562 if (error) 563 return (error); 564 so = (struct socket *)fp->f_data; 565 566 if (fflags & O_FBLOCKING) 567 /* fflags &= ~FNONBLOCK; */; 568 else if (fflags & O_FNONBLOCKING) 569 fflags |= FNONBLOCK; 570 else 571 fflags = fp->f_flag; 572 573 if (so->so_state & SS_ISCONNECTING) { 574 error = EALREADY; 575 goto done; 576 } 577 error = soconnect(so, sa, td, use_soconnect_async ? FALSE : TRUE); 578 if (error) 579 goto bad; 580 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) { 581 error = EINPROGRESS; 582 goto done; 583 } 584 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 585 struct netmsg_so_notify msg; 586 587 netmsg_init_abortable(&msg.base, so, 588 &curthread->td_msgport, 589 0, 590 netmsg_so_notify, 591 netmsg_so_notify_doabort); 592 msg.nm_predicate = soconnected_predicate; 593 msg.nm_etype = NM_REVENT; 594 error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH); 595 if (error == EINTR || error == ERESTART) 596 interrupted = 1; 597 } 598 if (error == 0) { 599 error = so->so_error; 600 so->so_error = 0; 601 } 602 bad: 603 if (!interrupted) 604 soclrstate(so, SS_ISCONNECTING); 605 if (error == ERESTART) 606 error = EINTR; 607 done: 608 fdrop(fp); 609 return (error); 610 } 611 612 /* 613 * connect_args(int s, caddr_t name, int namelen) 614 * 615 * MPALMOSTSAFE 616 */ 617 int 618 sys_connect(struct connect_args *uap) 619 { 620 struct sockaddr *sa; 621 int error; 622 623 error = getsockaddr(&sa, uap->name, uap->namelen); 624 if (error) 625 return (error); 626 error = kern_connect(uap->s, 0, sa); 627 kfree(sa, M_SONAME); 628 629 return (error); 630 } 631 632 /* 633 * connect_args(int s, int fflags, caddr_t name, int namelen) 634 * 635 * MPALMOSTSAFE 636 */ 637 int 638 sys_extconnect(struct extconnect_args *uap) 639 { 640 struct sockaddr *sa; 641 int error; 642 int fflags = uap->flags & O_FMASK; 643 644 error = getsockaddr(&sa, uap->name, uap->namelen); 645 if (error) 646 return (error); 647 error = kern_connect(uap->s, fflags, sa); 648 kfree(sa, M_SONAME); 649 650 return (error); 651 } 652 653 int 654 kern_socketpair(int domain, int type, int protocol, int *sv) 655 { 656 struct thread *td = curthread; 657 struct filedesc *fdp; 658 struct file *fp1, *fp2; 659 struct socket *so1, *so2; 660 int fd1, fd2, error; 661 u_int fflags = 0; 662 int oflags = 0; 663 664 if (type & SOCK_NONBLOCK) { 665 type &= ~SOCK_NONBLOCK; 666 fflags |= FNONBLOCK; 667 } 668 if (type & SOCK_CLOEXEC) { 669 type &= ~SOCK_CLOEXEC; 670 oflags |= O_CLOEXEC; 671 } 672 673 fdp = td->td_proc->p_fd; 674 error = socreate(domain, &so1, type, protocol, td); 675 if (error) 676 return (error); 677 error = socreate(domain, &so2, type, protocol, td); 678 if (error) 679 goto free1; 680 error = falloc(td->td_lwp, &fp1, &fd1); 681 if (error) 682 goto free2; 683 sv[0] = fd1; 684 fp1->f_data = so1; 685 error = falloc(td->td_lwp, &fp2, &fd2); 686 if (error) 687 goto free3; 688 fp2->f_data = so2; 689 sv[1] = fd2; 690 error = soconnect2(so1, so2); 691 if (error) 692 goto free4; 693 if (type == SOCK_DGRAM) { 694 /* 695 * Datagram socket connection is asymmetric. 696 */ 697 error = soconnect2(so2, so1); 698 if (error) 699 goto free4; 700 } 701 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 702 fp1->f_flag = fp2->f_flag = FREAD|FWRITE|fflags; 703 fp1->f_ops = fp2->f_ops = &socketops; 704 if (oflags & O_CLOEXEC) { 705 fdp->fd_files[fd1].fileflags |= UF_EXCLOSE; 706 fdp->fd_files[fd2].fileflags |= UF_EXCLOSE; 707 } 708 fsetfd(fdp, fp1, fd1); 709 fsetfd(fdp, fp2, fd2); 710 fdrop(fp1); 711 fdrop(fp2); 712 return (error); 713 free4: 714 fsetfd(fdp, NULL, fd2); 715 fdrop(fp2); 716 free3: 717 fsetfd(fdp, NULL, fd1); 718 fdrop(fp1); 719 free2: 720 (void)soclose(so2, 0); 721 free1: 722 (void)soclose(so1, 0); 723 return (error); 724 } 725 726 /* 727 * socketpair(int domain, int type, int protocol, int *rsv) 728 */ 729 int 730 sys_socketpair(struct socketpair_args *uap) 731 { 732 int error, sockv[2]; 733 734 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); 735 736 if (error == 0) { 737 error = copyout(sockv, uap->rsv, sizeof(sockv)); 738 739 if (error != 0) { 740 kern_close(sockv[0]); 741 kern_close(sockv[1]); 742 } 743 } 744 745 return (error); 746 } 747 748 int 749 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, 750 struct mbuf *control, int flags, size_t *res) 751 { 752 struct thread *td = curthread; 753 struct lwp *lp = td->td_lwp; 754 struct proc *p = td->td_proc; 755 struct file *fp; 756 size_t len; 757 int error; 758 struct socket *so; 759 #ifdef KTRACE 760 struct iovec *ktriov = NULL; 761 struct uio ktruio; 762 #endif 763 764 error = holdsock(p->p_fd, s, &fp); 765 if (error) 766 return (error); 767 #ifdef KTRACE 768 if (KTRPOINT(td, KTR_GENIO)) { 769 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 770 771 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 772 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 773 ktruio = *auio; 774 } 775 #endif 776 len = auio->uio_resid; 777 so = (struct socket *)fp->f_data; 778 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 779 if (fp->f_flag & FNONBLOCK) 780 flags |= MSG_FNONBLOCKING; 781 } 782 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); 783 if (error) { 784 if (auio->uio_resid != len && (error == ERESTART || 785 error == EINTR || error == EWOULDBLOCK)) 786 error = 0; 787 if (error == EPIPE && !(flags & MSG_NOSIGNAL) && 788 !(so->so_options & SO_NOSIGPIPE)) 789 lwpsignal(p, lp, SIGPIPE); 790 } 791 #ifdef KTRACE 792 if (ktriov != NULL) { 793 if (error == 0) { 794 ktruio.uio_iov = ktriov; 795 ktruio.uio_resid = len - auio->uio_resid; 796 ktrgenio(lp, s, UIO_WRITE, &ktruio, error); 797 } 798 kfree(ktriov, M_TEMP); 799 } 800 #endif 801 if (error == 0) 802 *res = len - auio->uio_resid; 803 fdrop(fp); 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 proc *p = td->td_proc; 932 struct file *fp; 933 size_t len; 934 int error; 935 int lflags; 936 struct socket *so; 937 #ifdef KTRACE 938 struct iovec *ktriov = NULL; 939 struct uio ktruio; 940 #endif 941 942 error = holdsock(p->p_fd, s, &fp); 943 if (error) 944 return (error); 945 #ifdef KTRACE 946 if (KTRPOINT(td, KTR_GENIO)) { 947 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 948 949 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 950 bcopy(auio->uio_iov, ktriov, iovlen); 951 ktruio = *auio; 952 } 953 #endif 954 len = auio->uio_resid; 955 so = (struct socket *)fp->f_data; 956 957 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 958 if (fp->f_flag & FNONBLOCK) { 959 if (flags) { 960 *flags |= MSG_FNONBLOCKING; 961 } else { 962 lflags = MSG_FNONBLOCKING; 963 flags = &lflags; 964 } 965 } 966 } 967 968 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 969 if (error) { 970 if (auio->uio_resid != len && (error == ERESTART || 971 error == EINTR || error == EWOULDBLOCK)) 972 error = 0; 973 } 974 #ifdef KTRACE 975 if (ktriov != NULL) { 976 if (error == 0) { 977 ktruio.uio_iov = ktriov; 978 ktruio.uio_resid = len - auio->uio_resid; 979 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 980 } 981 kfree(ktriov, M_TEMP); 982 } 983 #endif 984 if (error == 0) 985 *res = len - auio->uio_resid; 986 fdrop(fp); 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 proc *p = td->td_proc; 1173 struct file *fp; 1174 int error; 1175 1176 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1177 return (EFAULT); 1178 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1179 return (EINVAL); 1180 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1181 return (EINVAL); 1182 1183 error = holdsock(p->p_fd, s, &fp); 1184 if (error) 1185 return (error); 1186 1187 error = sosetopt((struct socket *)fp->f_data, sopt); 1188 fdrop(fp); 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 proc *p = td->td_proc; 1236 struct file *fp; 1237 int error; 1238 1239 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1240 return (EFAULT); 1241 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1242 return (EINVAL); 1243 1244 error = holdsock(p->p_fd, s, &fp); 1245 if (error) 1246 return (error); 1247 1248 error = sogetopt((struct socket *)fp->f_data, sopt); 1249 fdrop(fp); 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 proc *p = td->td_proc; 1323 struct file *fp; 1324 struct socket *so; 1325 struct sockaddr *sa = NULL; 1326 int error; 1327 1328 error = holdsock(p->p_fd, s, &fp); 1329 if (error) 1330 return (error); 1331 if (*namelen < 0) { 1332 fdrop(fp); 1333 return (EINVAL); 1334 } 1335 so = (struct socket *)fp->f_data; 1336 error = so_pru_sockaddr(so, &sa); 1337 if (error == 0) { 1338 if (sa == NULL) { 1339 *namelen = 0; 1340 } else { 1341 *namelen = MIN(*namelen, sa->sa_len); 1342 *name = sa; 1343 } 1344 } 1345 1346 fdrop(fp); 1347 return (error); 1348 } 1349 1350 /* 1351 * getsockname_args(int fdes, caddr_t asa, int *alen) 1352 * 1353 * Get socket name. 1354 * 1355 * MPALMOSTSAFE 1356 */ 1357 int 1358 sys_getsockname(struct getsockname_args *uap) 1359 { 1360 struct sockaddr *sa = NULL; 1361 int error, sa_len; 1362 1363 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1364 if (error) 1365 return (error); 1366 1367 error = kern_getsockname(uap->fdes, &sa, &sa_len); 1368 1369 if (error == 0) 1370 error = copyout(sa, uap->asa, sa_len); 1371 if (error == 0) 1372 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1373 if (sa) 1374 kfree(sa, M_SONAME); 1375 return (error); 1376 } 1377 1378 /* 1379 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1380 * This allows kern_getpeername() to return a pointer to an allocated struct 1381 * sockaddr which must be freed later with FREE(). The caller must 1382 * initialize *name to NULL. 1383 */ 1384 int 1385 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1386 { 1387 struct thread *td = curthread; 1388 struct proc *p = td->td_proc; 1389 struct file *fp; 1390 struct socket *so; 1391 struct sockaddr *sa = NULL; 1392 int error; 1393 1394 error = holdsock(p->p_fd, s, &fp); 1395 if (error) 1396 return (error); 1397 if (*namelen < 0) { 1398 fdrop(fp); 1399 return (EINVAL); 1400 } 1401 so = (struct socket *)fp->f_data; 1402 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1403 fdrop(fp); 1404 return (ENOTCONN); 1405 } 1406 error = so_pru_peeraddr(so, &sa); 1407 if (error == 0) { 1408 if (sa == NULL) { 1409 *namelen = 0; 1410 } else { 1411 *namelen = MIN(*namelen, sa->sa_len); 1412 *name = sa; 1413 } 1414 } 1415 1416 fdrop(fp); 1417 return (error); 1418 } 1419 1420 /* 1421 * getpeername_args(int fdes, caddr_t asa, int *alen) 1422 * 1423 * Get name of peer for connected socket. 1424 * 1425 * MPALMOSTSAFE 1426 */ 1427 int 1428 sys_getpeername(struct getpeername_args *uap) 1429 { 1430 struct sockaddr *sa = NULL; 1431 int error, sa_len; 1432 1433 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1434 if (error) 1435 return (error); 1436 1437 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1438 1439 if (error == 0) 1440 error = copyout(sa, uap->asa, sa_len); 1441 if (error == 0) 1442 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1443 if (sa) 1444 kfree(sa, M_SONAME); 1445 return (error); 1446 } 1447 1448 int 1449 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1450 { 1451 struct sockaddr *sa; 1452 int error; 1453 1454 *namp = NULL; 1455 if (len > SOCK_MAXADDRLEN) 1456 return ENAMETOOLONG; 1457 if (len < offsetof(struct sockaddr, sa_data[0])) 1458 return EDOM; 1459 sa = kmalloc(len, M_SONAME, M_WAITOK); 1460 error = copyin(uaddr, sa, len); 1461 if (error) { 1462 kfree(sa, M_SONAME); 1463 } else { 1464 #if BYTE_ORDER != BIG_ENDIAN 1465 /* 1466 * The bind(), connect(), and sendto() syscalls were not 1467 * versioned for COMPAT_43. Thus, this check must stay. 1468 */ 1469 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1470 sa->sa_family = sa->sa_len; 1471 #endif 1472 sa->sa_len = len; 1473 *namp = sa; 1474 } 1475 return error; 1476 } 1477 1478 /* 1479 * Detach a mapped page and release resources back to the system. 1480 * We must release our wiring and if the object is ripped out 1481 * from under the vm_page we become responsible for freeing the 1482 * page. 1483 * 1484 * MPSAFE 1485 */ 1486 static void 1487 sf_buf_mfree(void *arg) 1488 { 1489 struct sf_buf *sf = arg; 1490 vm_page_t m; 1491 1492 m = sf_buf_page(sf); 1493 if (sf_buf_free(sf)) { 1494 /* sf invalid now */ 1495 vm_page_sbusy_drop(m); 1496 #if 0 1497 if (m->object == NULL && 1498 m->wire_count == 0 && 1499 (m->flags & PG_NEED_COMMIT) == 0) { 1500 vm_page_free(m); 1501 } else { 1502 vm_page_wakeup(m); 1503 } 1504 #endif 1505 } 1506 } 1507 1508 /* 1509 * sendfile(2). 1510 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1511 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1512 * 1513 * Send a file specified by 'fd' and starting at 'offset' to a socket 1514 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1515 * nbytes == 0. Optionally add a header and/or trailer to the socket 1516 * output. If specified, write the total number of bytes sent into *sbytes. 1517 * 1518 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1519 * the headers to count against the remaining bytes to be sent from 1520 * the file descriptor. We may wish to implement a compatibility syscall 1521 * in the future. 1522 * 1523 * MPALMOSTSAFE 1524 */ 1525 int 1526 sys_sendfile(struct sendfile_args *uap) 1527 { 1528 struct thread *td = curthread; 1529 struct proc *p = td->td_proc; 1530 struct file *fp; 1531 struct vnode *vp = NULL; 1532 struct sf_hdtr hdtr; 1533 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1534 struct uio auio; 1535 struct mbuf *mheader = NULL; 1536 size_t hbytes = 0; 1537 size_t tbytes; 1538 off_t hdtr_size = 0; 1539 off_t sbytes; 1540 int error; 1541 1542 KKASSERT(p); 1543 1544 /* 1545 * Do argument checking. Must be a regular file in, stream 1546 * type and connected socket out, positive offset. 1547 */ 1548 fp = holdfp(p->p_fd, uap->fd, FREAD); 1549 if (fp == NULL) { 1550 return (EBADF); 1551 } 1552 if (fp->f_type != DTYPE_VNODE) { 1553 fdrop(fp); 1554 return (EINVAL); 1555 } 1556 vp = (struct vnode *)fp->f_data; 1557 vref(vp); 1558 fdrop(fp); 1559 1560 /* 1561 * If specified, get the pointer to the sf_hdtr struct for 1562 * any headers/trailers. 1563 */ 1564 if (uap->hdtr) { 1565 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1566 if (error) 1567 goto done; 1568 /* 1569 * Send any headers. 1570 */ 1571 if (hdtr.headers) { 1572 error = iovec_copyin(hdtr.headers, &iov, aiov, 1573 hdtr.hdr_cnt, &hbytes); 1574 if (error) 1575 goto done; 1576 auio.uio_iov = iov; 1577 auio.uio_iovcnt = hdtr.hdr_cnt; 1578 auio.uio_offset = 0; 1579 auio.uio_segflg = UIO_USERSPACE; 1580 auio.uio_rw = UIO_WRITE; 1581 auio.uio_td = td; 1582 auio.uio_resid = hbytes; 1583 1584 mheader = m_uiomove(&auio); 1585 1586 iovec_free(&iov, aiov); 1587 if (mheader == NULL) 1588 goto done; 1589 } 1590 } 1591 1592 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1593 &sbytes, uap->flags); 1594 if (error) 1595 goto done; 1596 1597 /* 1598 * Send trailers. Wimp out and use writev(2). 1599 */ 1600 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1601 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1602 hdtr.trl_cnt, &auio.uio_resid); 1603 if (error) 1604 goto done; 1605 auio.uio_iov = iov; 1606 auio.uio_iovcnt = hdtr.trl_cnt; 1607 auio.uio_offset = 0; 1608 auio.uio_segflg = UIO_USERSPACE; 1609 auio.uio_rw = UIO_WRITE; 1610 auio.uio_td = td; 1611 1612 tbytes = 0; /* avoid gcc warnings */ 1613 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1614 1615 iovec_free(&iov, aiov); 1616 if (error) 1617 goto done; 1618 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1619 } 1620 1621 done: 1622 if (vp) 1623 vrele(vp); 1624 if (uap->sbytes != NULL) { 1625 sbytes += hdtr_size; 1626 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1627 } 1628 return (error); 1629 } 1630 1631 int 1632 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1633 struct mbuf *mheader, off_t *sbytes, int flags) 1634 { 1635 struct thread *td = curthread; 1636 struct proc *p = td->td_proc; 1637 struct vm_object *obj; 1638 struct socket *so; 1639 struct file *fp; 1640 struct mbuf *m, *mp; 1641 struct sf_buf *sf; 1642 struct vm_page *pg; 1643 off_t off, xfsize, xbytes; 1644 off_t hbytes = 0; 1645 int error = 0; 1646 1647 if (vp->v_type != VREG) { 1648 error = EINVAL; 1649 goto done0; 1650 } 1651 if ((obj = vp->v_object) == NULL) { 1652 error = EINVAL; 1653 goto done0; 1654 } 1655 error = holdsock(p->p_fd, sfd, &fp); 1656 if (error) 1657 goto done0; 1658 so = (struct socket *)fp->f_data; 1659 if (so->so_type != SOCK_STREAM) { 1660 error = EINVAL; 1661 goto done1; 1662 } 1663 if ((so->so_state & SS_ISCONNECTED) == 0) { 1664 error = ENOTCONN; 1665 goto done1; 1666 } 1667 if (offset < 0) { 1668 error = EINVAL; 1669 goto done1; 1670 } 1671 1672 /* 1673 * preallocation is required for asynchronous passing of mbufs, 1674 * otherwise we can wind up building up an infinite number of 1675 * mbufs during the asynchronous latency. 1676 */ 1677 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1678 error = EINVAL; 1679 goto done1; 1680 } 1681 1682 *sbytes = 0; 1683 xbytes = 0; 1684 1685 /* 1686 * Protect against multiple writers to the socket. 1687 * We need at least a shared lock on the VM object 1688 */ 1689 ssb_lock(&so->so_snd, M_WAITOK); 1690 vm_object_hold_shared(obj); 1691 1692 /* 1693 * Loop through the pages in the file, starting with the requested 1694 * offset. Get a file page (do I/O if necessary), map the file page 1695 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1696 * it on the socket. 1697 */ 1698 for (off = offset; ; 1699 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1700 vm_pindex_t pindex; 1701 vm_offset_t pgoff; 1702 long space; 1703 int loops; 1704 1705 pindex = OFF_TO_IDX(off); 1706 loops = 0; 1707 1708 retry_lookup: 1709 /* 1710 * Calculate the amount to transfer. Not to exceed a page, 1711 * the EOF, or the passed in nbytes. 1712 */ 1713 xfsize = vp->v_filesize - off; 1714 if (xfsize > PAGE_SIZE) 1715 xfsize = PAGE_SIZE; 1716 pgoff = (vm_offset_t)(off & PAGE_MASK); 1717 if (PAGE_SIZE - pgoff < xfsize) 1718 xfsize = PAGE_SIZE - pgoff; 1719 if (nbytes && xfsize > (nbytes - xbytes)) 1720 xfsize = nbytes - xbytes; 1721 if (xfsize <= 0) 1722 break; 1723 /* 1724 * Optimize the non-blocking case by looking at the socket space 1725 * before going to the extra work of constituting the sf_buf. 1726 */ 1727 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1728 space = ssb_space_prealloc(&so->so_snd); 1729 else 1730 space = ssb_space(&so->so_snd); 1731 1732 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1733 if (so->so_state & SS_CANTSENDMORE) 1734 error = EPIPE; 1735 else 1736 error = EAGAIN; 1737 goto done; 1738 } 1739 1740 /* 1741 * Attempt to look up the page. 1742 * 1743 * Try to find the data using a shared vm_object token and 1744 * vm_page_lookup_sbusy_try() first. 1745 * 1746 * If data is missing, use a UIO_NOCOPY VOP_READ to load 1747 * the missing data and loop back up. We avoid all sorts 1748 * of problems by not trying to hold onto the page during 1749 * the I/O. 1750 * 1751 * NOTE: The soft-busy will temporary block filesystem 1752 * truncation operations when a file is removed 1753 * while the sendfile is running. 1754 */ 1755 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize); 1756 if (pg == NULL) { 1757 struct uio auio; 1758 struct iovec aiov; 1759 int bsize; 1760 1761 if (++loops > 100000) { 1762 kprintf("sendfile: VOP operation failed " 1763 "to retain page\n"); 1764 error = EIO; 1765 goto done; 1766 } 1767 1768 vm_object_drop(obj); 1769 bsize = vp->v_mount->mnt_stat.f_iosize; 1770 auio.uio_iov = &aiov; 1771 auio.uio_iovcnt = 1; 1772 aiov.iov_base = 0; 1773 aiov.iov_len = MAXBSIZE; 1774 auio.uio_resid = MAXBSIZE; 1775 auio.uio_offset = trunc_page(off); 1776 auio.uio_segflg = UIO_NOCOPY; 1777 auio.uio_rw = UIO_READ; 1778 auio.uio_td = td; 1779 1780 vn_lock(vp, LK_SHARED | LK_RETRY); 1781 error = VOP_READ(vp, &auio, 1782 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1783 td->td_ucred); 1784 vn_unlock(vp); 1785 vm_object_hold_shared(obj); 1786 1787 if (error) 1788 goto done; 1789 goto retry_lookup; 1790 } 1791 1792 /* 1793 * Get a sendfile buf. We usually wait as long as necessary, 1794 * but this wait can be interrupted. 1795 */ 1796 if ((sf = sf_buf_alloc(pg)) == NULL) { 1797 vm_page_sbusy_drop(pg); 1798 /* vm_page_try_to_free(pg); */ 1799 error = EINTR; 1800 goto done; 1801 } 1802 1803 /* 1804 * Get an mbuf header and set it up as having external storage. 1805 */ 1806 MGETHDR(m, M_WAITOK, MT_DATA); 1807 if (m == NULL) { 1808 error = ENOBUFS; 1809 vm_page_sbusy_drop(pg); 1810 /* vm_page_try_to_free(pg); */ 1811 sf_buf_free(sf); 1812 goto done; 1813 } 1814 1815 m->m_ext.ext_free = sf_buf_mfree; 1816 m->m_ext.ext_ref = sf_buf_ref; 1817 m->m_ext.ext_arg = sf; 1818 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1819 m->m_ext.ext_size = PAGE_SIZE; 1820 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1821 m->m_flags |= M_EXT; 1822 m->m_pkthdr.len = m->m_len = xfsize; 1823 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1824 1825 if (mheader != NULL) { 1826 hbytes = mheader->m_pkthdr.len; 1827 mheader->m_pkthdr.len += m->m_pkthdr.len; 1828 m_cat(mheader, m); 1829 m = mheader; 1830 mheader = NULL; 1831 } else { 1832 hbytes = 0; 1833 } 1834 1835 /* 1836 * Add the buffer to the socket buffer chain. 1837 */ 1838 crit_enter(); 1839 retry_space: 1840 /* 1841 * Make sure that the socket is still able to take more data. 1842 * CANTSENDMORE being true usually means that the connection 1843 * was closed. so_error is true when an error was sensed after 1844 * a previous send. 1845 * The state is checked after the page mapping and buffer 1846 * allocation above since those operations may block and make 1847 * any socket checks stale. From this point forward, nothing 1848 * blocks before the pru_send (or more accurately, any blocking 1849 * results in a loop back to here to re-check). 1850 */ 1851 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1852 if (so->so_state & SS_CANTSENDMORE) { 1853 error = EPIPE; 1854 } else { 1855 error = so->so_error; 1856 so->so_error = 0; 1857 } 1858 m_freem(m); 1859 crit_exit(); 1860 goto done; 1861 } 1862 /* 1863 * Wait for socket space to become available. We do this just 1864 * after checking the connection state above in order to avoid 1865 * a race condition with ssb_wait(). 1866 */ 1867 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1868 space = ssb_space_prealloc(&so->so_snd); 1869 else 1870 space = ssb_space(&so->so_snd); 1871 1872 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1873 if (fp->f_flag & FNONBLOCK) { 1874 m_freem(m); 1875 crit_exit(); 1876 error = EAGAIN; 1877 goto done; 1878 } 1879 error = ssb_wait(&so->so_snd); 1880 /* 1881 * An error from ssb_wait usually indicates that we've 1882 * been interrupted by a signal. If we've sent anything 1883 * then return bytes sent, otherwise return the error. 1884 */ 1885 if (error) { 1886 m_freem(m); 1887 crit_exit(); 1888 goto done; 1889 } 1890 goto retry_space; 1891 } 1892 1893 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1894 for (mp = m; mp != NULL; mp = mp->m_next) 1895 ssb_preallocstream(&so->so_snd, mp); 1896 } 1897 if (use_sendfile_async) 1898 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1899 else 1900 error = so_pru_send(so, 0, m, NULL, NULL, td); 1901 1902 crit_exit(); 1903 if (error) 1904 goto done; 1905 } 1906 if (mheader != NULL) { 1907 *sbytes += mheader->m_pkthdr.len; 1908 1909 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1910 for (mp = mheader; mp != NULL; mp = mp->m_next) 1911 ssb_preallocstream(&so->so_snd, mp); 1912 } 1913 if (use_sendfile_async) 1914 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1915 else 1916 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1917 1918 mheader = NULL; 1919 } 1920 done: 1921 vm_object_drop(obj); 1922 ssb_unlock(&so->so_snd); 1923 done1: 1924 fdrop(fp); 1925 done0: 1926 if (mheader != NULL) 1927 m_freem(mheader); 1928 return (error); 1929 } 1930