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; 100 101 KKASSERT(td->td_lwp); 102 103 error = falloc(td->td_lwp, &fp, &fd); 104 if (error) 105 return (error); 106 error = socreate(domain, &so, type, protocol, td); 107 if (error) { 108 fsetfd(fdp, NULL, fd); 109 } else { 110 fp->f_type = DTYPE_SOCKET; 111 fp->f_flag = FREAD | FWRITE; 112 fp->f_ops = &socketops; 113 fp->f_data = so; 114 *res = fd; 115 fsetfd(fdp, fp, fd); 116 } 117 fdrop(fp); 118 return (error); 119 } 120 121 /* 122 * MPALMOSTSAFE 123 */ 124 int 125 sys_socket(struct socket_args *uap) 126 { 127 int error; 128 129 error = kern_socket(uap->domain, uap->type, uap->protocol, 130 &uap->sysmsg_iresult); 131 132 return (error); 133 } 134 135 int 136 kern_bind(int s, struct sockaddr *sa) 137 { 138 struct thread *td = curthread; 139 struct proc *p = td->td_proc; 140 struct file *fp; 141 int error; 142 143 KKASSERT(p); 144 error = holdsock(p->p_fd, s, &fp); 145 if (error) 146 return (error); 147 error = sobind((struct socket *)fp->f_data, sa, td); 148 fdrop(fp); 149 return (error); 150 } 151 152 /* 153 * bind_args(int s, caddr_t name, int namelen) 154 * 155 * MPALMOSTSAFE 156 */ 157 int 158 sys_bind(struct bind_args *uap) 159 { 160 struct sockaddr *sa; 161 int error; 162 163 error = getsockaddr(&sa, uap->name, uap->namelen); 164 if (error) 165 return (error); 166 error = kern_bind(uap->s, sa); 167 kfree(sa, M_SONAME); 168 169 return (error); 170 } 171 172 int 173 kern_listen(int s, int backlog) 174 { 175 struct thread *td = curthread; 176 struct proc *p = td->td_proc; 177 struct file *fp; 178 int error; 179 180 KKASSERT(p); 181 error = holdsock(p->p_fd, s, &fp); 182 if (error) 183 return (error); 184 error = solisten((struct socket *)fp->f_data, backlog, td); 185 fdrop(fp); 186 return(error); 187 } 188 189 /* 190 * listen_args(int s, int backlog) 191 * 192 * MPALMOSTSAFE 193 */ 194 int 195 sys_listen(struct listen_args *uap) 196 { 197 int error; 198 199 error = kern_listen(uap->s, uap->backlog); 200 return (error); 201 } 202 203 /* 204 * Returns the accepted socket as well. 205 * 206 * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the 207 * pool token is absolutely required to avoid a sofree() race, 208 * as well as to avoid tailq handling races. 209 */ 210 static boolean_t 211 soaccept_predicate(struct netmsg_so_notify *msg) 212 { 213 struct socket *head = msg->base.nm_so; 214 struct socket *so; 215 216 if (head->so_error != 0) { 217 msg->base.lmsg.ms_error = head->so_error; 218 return (TRUE); 219 } 220 lwkt_getpooltoken(head); 221 if (!TAILQ_EMPTY(&head->so_comp)) { 222 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */ 223 so = TAILQ_FIRST(&head->so_comp); 224 TAILQ_REMOVE(&head->so_comp, so, so_list); 225 head->so_qlen--; 226 soclrstate(so, SS_COMP); 227 so->so_head = NULL; 228 soreference(so); 229 230 lwkt_relpooltoken(head); 231 232 msg->base.lmsg.ms_error = 0; 233 msg->base.nm_so = so; 234 return (TRUE); 235 } 236 lwkt_relpooltoken(head); 237 if (head->so_state & SS_CANTRCVMORE) { 238 msg->base.lmsg.ms_error = ECONNABORTED; 239 return (TRUE); 240 } 241 if (msg->nm_fflags & FNONBLOCK) { 242 msg->base.lmsg.ms_error = EWOULDBLOCK; 243 return (TRUE); 244 } 245 246 return (FALSE); 247 } 248 249 /* 250 * The second argument to kern_accept() is a handle to a struct sockaddr. 251 * This allows kern_accept() to return a pointer to an allocated struct 252 * sockaddr which must be freed later with FREE(). The caller must 253 * initialize *name to NULL. 254 */ 255 int 256 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res) 257 { 258 struct thread *td = curthread; 259 struct filedesc *fdp = td->td_proc->p_fd; 260 struct file *lfp = NULL; 261 struct file *nfp = NULL; 262 struct sockaddr *sa; 263 struct socket *head, *so; 264 struct netmsg_so_notify msg; 265 int fd; 266 u_int fflag; /* type must match fp->f_flag */ 267 int error, tmp; 268 269 *res = -1; 270 if (name && namelen && *namelen < 0) 271 return (EINVAL); 272 273 error = holdsock(td->td_proc->p_fd, s, &lfp); 274 if (error) 275 return (error); 276 277 error = falloc(td->td_lwp, &nfp, &fd); 278 if (error) { /* Probably ran out of file descriptors. */ 279 fdrop(lfp); 280 return (error); 281 } 282 head = (struct socket *)lfp->f_data; 283 if ((head->so_options & SO_ACCEPTCONN) == 0) { 284 error = EINVAL; 285 goto done; 286 } 287 288 if (fflags & O_FBLOCKING) 289 fflags |= lfp->f_flag & ~FNONBLOCK; 290 else if (fflags & O_FNONBLOCKING) 291 fflags |= lfp->f_flag | FNONBLOCK; 292 else 293 fflags = lfp->f_flag; 294 295 if (use_soaccept_pred_fast) { 296 boolean_t pred; 297 298 /* Initialize necessary parts for soaccept_predicate() */ 299 netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL); 300 msg.nm_fflags = fflags; 301 302 lwkt_getpooltoken(head); 303 pred = soaccept_predicate(&msg); 304 lwkt_relpooltoken(head); 305 306 if (pred) { 307 error = msg.base.lmsg.ms_error; 308 if (error) 309 goto done; 310 else 311 goto accepted; 312 } 313 } 314 315 /* optimize for uniprocessor case later XXX JH */ 316 netmsg_init_abortable(&msg.base, head, &curthread->td_msgport, 317 0, netmsg_so_notify, netmsg_so_notify_doabort); 318 msg.nm_predicate = soaccept_predicate; 319 msg.nm_fflags = fflags; 320 msg.nm_etype = NM_REVENT; 321 error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH); 322 if (error) 323 goto done; 324 325 accepted: 326 /* 327 * At this point we have the connection that's ready to be accepted. 328 * 329 * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects 330 * to eat the ref and turn it into a descriptor. 331 */ 332 so = msg.base.nm_so; 333 334 fflag = lfp->f_flag; 335 336 /* connection has been removed from the listen queue */ 337 KNOTE(&head->so_rcv.ssb_kq.ki_note, 0); 338 339 if (head->so_sigio != NULL) 340 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 341 342 nfp->f_type = DTYPE_SOCKET; 343 nfp->f_flag = fflag; 344 nfp->f_ops = &socketops; 345 nfp->f_data = so; 346 /* Sync socket nonblocking/async state with file flags */ 347 tmp = fflag & FNONBLOCK; 348 fo_ioctl(nfp, FIONBIO, (caddr_t)&tmp, td->td_ucred, NULL); 349 tmp = fflag & FASYNC; 350 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL); 351 352 sa = NULL; 353 if (so->so_faddr != NULL) { 354 sa = so->so_faddr; 355 so->so_faddr = NULL; 356 357 soaccept_generic(so); 358 error = 0; 359 } else { 360 error = soaccept(so, &sa); 361 } 362 363 /* 364 * Set the returned name and namelen as applicable. Set the returned 365 * namelen to 0 for older code which might ignore the return value 366 * from accept. 367 */ 368 if (error == 0) { 369 if (sa && name && namelen) { 370 if (*namelen > sa->sa_len) 371 *namelen = sa->sa_len; 372 *name = sa; 373 } else { 374 if (sa) 375 kfree(sa, M_SONAME); 376 } 377 } 378 379 done: 380 /* 381 * If an error occured clear the reserved descriptor, else associate 382 * nfp with it. 383 * 384 * Note that *res is normally ignored if an error is returned but 385 * a syscall message will still have access to the result code. 386 */ 387 if (error) { 388 fsetfd(fdp, NULL, fd); 389 } else { 390 *res = fd; 391 fsetfd(fdp, nfp, fd); 392 } 393 fdrop(nfp); 394 fdrop(lfp); 395 return (error); 396 } 397 398 /* 399 * accept(int s, caddr_t name, int *anamelen) 400 * 401 * MPALMOSTSAFE 402 */ 403 int 404 sys_accept(struct accept_args *uap) 405 { 406 struct sockaddr *sa = NULL; 407 int sa_len; 408 int error; 409 410 if (uap->name) { 411 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 412 if (error) 413 return (error); 414 415 error = kern_accept(uap->s, 0, &sa, &sa_len, 416 &uap->sysmsg_iresult); 417 418 if (error == 0) 419 error = copyout(sa, uap->name, sa_len); 420 if (error == 0) { 421 error = copyout(&sa_len, uap->anamelen, 422 sizeof(*uap->anamelen)); 423 } 424 if (sa) 425 kfree(sa, M_SONAME); 426 } else { 427 error = kern_accept(uap->s, 0, NULL, 0, 428 &uap->sysmsg_iresult); 429 } 430 return (error); 431 } 432 433 /* 434 * extaccept(int s, int fflags, caddr_t name, int *anamelen) 435 * 436 * MPALMOSTSAFE 437 */ 438 int 439 sys_extaccept(struct extaccept_args *uap) 440 { 441 struct sockaddr *sa = NULL; 442 int sa_len; 443 int error; 444 int fflags = uap->flags & O_FMASK; 445 446 if (uap->name) { 447 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 448 if (error) 449 return (error); 450 451 error = kern_accept(uap->s, fflags, &sa, &sa_len, 452 &uap->sysmsg_iresult); 453 454 if (error == 0) 455 error = copyout(sa, uap->name, sa_len); 456 if (error == 0) { 457 error = copyout(&sa_len, uap->anamelen, 458 sizeof(*uap->anamelen)); 459 } 460 if (sa) 461 kfree(sa, M_SONAME); 462 } else { 463 error = kern_accept(uap->s, fflags, NULL, 0, 464 &uap->sysmsg_iresult); 465 } 466 return (error); 467 } 468 469 470 /* 471 * Returns TRUE if predicate satisfied. 472 */ 473 static boolean_t 474 soconnected_predicate(struct netmsg_so_notify *msg) 475 { 476 struct socket *so = msg->base.nm_so; 477 478 /* check predicate */ 479 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) { 480 msg->base.lmsg.ms_error = so->so_error; 481 return (TRUE); 482 } 483 484 return (FALSE); 485 } 486 487 int 488 kern_connect(int s, int fflags, struct sockaddr *sa) 489 { 490 struct thread *td = curthread; 491 struct proc *p = td->td_proc; 492 struct file *fp; 493 struct socket *so; 494 int error, interrupted = 0; 495 496 error = holdsock(p->p_fd, s, &fp); 497 if (error) 498 return (error); 499 so = (struct socket *)fp->f_data; 500 501 if (fflags & O_FBLOCKING) 502 /* fflags &= ~FNONBLOCK; */; 503 else if (fflags & O_FNONBLOCKING) 504 fflags |= FNONBLOCK; 505 else 506 fflags = fp->f_flag; 507 508 if (so->so_state & SS_ISCONNECTING) { 509 error = EALREADY; 510 goto done; 511 } 512 error = soconnect(so, sa, td, use_soconnect_async ? FALSE : TRUE); 513 if (error) 514 goto bad; 515 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) { 516 error = EINPROGRESS; 517 goto done; 518 } 519 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 520 struct netmsg_so_notify msg; 521 522 netmsg_init_abortable(&msg.base, so, 523 &curthread->td_msgport, 524 0, 525 netmsg_so_notify, 526 netmsg_so_notify_doabort); 527 msg.nm_predicate = soconnected_predicate; 528 msg.nm_etype = NM_REVENT; 529 error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH); 530 if (error == EINTR || error == ERESTART) 531 interrupted = 1; 532 } 533 if (error == 0) { 534 error = so->so_error; 535 so->so_error = 0; 536 } 537 bad: 538 if (!interrupted) 539 soclrstate(so, SS_ISCONNECTING); 540 if (error == ERESTART) 541 error = EINTR; 542 done: 543 fdrop(fp); 544 return (error); 545 } 546 547 /* 548 * connect_args(int s, caddr_t name, int namelen) 549 * 550 * MPALMOSTSAFE 551 */ 552 int 553 sys_connect(struct connect_args *uap) 554 { 555 struct sockaddr *sa; 556 int error; 557 558 error = getsockaddr(&sa, uap->name, uap->namelen); 559 if (error) 560 return (error); 561 error = kern_connect(uap->s, 0, sa); 562 kfree(sa, M_SONAME); 563 564 return (error); 565 } 566 567 /* 568 * connect_args(int s, int fflags, caddr_t name, int namelen) 569 * 570 * MPALMOSTSAFE 571 */ 572 int 573 sys_extconnect(struct extconnect_args *uap) 574 { 575 struct sockaddr *sa; 576 int error; 577 int fflags = uap->flags & O_FMASK; 578 579 error = getsockaddr(&sa, uap->name, uap->namelen); 580 if (error) 581 return (error); 582 error = kern_connect(uap->s, fflags, sa); 583 kfree(sa, M_SONAME); 584 585 return (error); 586 } 587 588 int 589 kern_socketpair(int domain, int type, int protocol, int *sv) 590 { 591 struct thread *td = curthread; 592 struct filedesc *fdp; 593 struct file *fp1, *fp2; 594 struct socket *so1, *so2; 595 int fd1, fd2, error; 596 597 fdp = td->td_proc->p_fd; 598 error = socreate(domain, &so1, type, protocol, td); 599 if (error) 600 return (error); 601 error = socreate(domain, &so2, type, protocol, td); 602 if (error) 603 goto free1; 604 error = falloc(td->td_lwp, &fp1, &fd1); 605 if (error) 606 goto free2; 607 sv[0] = fd1; 608 fp1->f_data = so1; 609 error = falloc(td->td_lwp, &fp2, &fd2); 610 if (error) 611 goto free3; 612 fp2->f_data = so2; 613 sv[1] = fd2; 614 error = soconnect2(so1, so2); 615 if (error) 616 goto free4; 617 if (type == SOCK_DGRAM) { 618 /* 619 * Datagram socket connection is asymmetric. 620 */ 621 error = soconnect2(so2, so1); 622 if (error) 623 goto free4; 624 } 625 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 626 fp1->f_flag = fp2->f_flag = FREAD|FWRITE; 627 fp1->f_ops = fp2->f_ops = &socketops; 628 fsetfd(fdp, fp1, fd1); 629 fsetfd(fdp, fp2, fd2); 630 fdrop(fp1); 631 fdrop(fp2); 632 return (error); 633 free4: 634 fsetfd(fdp, NULL, fd2); 635 fdrop(fp2); 636 free3: 637 fsetfd(fdp, NULL, fd1); 638 fdrop(fp1); 639 free2: 640 (void)soclose(so2, 0); 641 free1: 642 (void)soclose(so1, 0); 643 return (error); 644 } 645 646 /* 647 * socketpair(int domain, int type, int protocol, int *rsv) 648 */ 649 int 650 sys_socketpair(struct socketpair_args *uap) 651 { 652 int error, sockv[2]; 653 654 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); 655 656 if (error == 0) { 657 error = copyout(sockv, uap->rsv, sizeof(sockv)); 658 659 if (error != 0) { 660 kern_close(sockv[0]); 661 kern_close(sockv[1]); 662 } 663 } 664 665 return (error); 666 } 667 668 int 669 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, 670 struct mbuf *control, int flags, size_t *res) 671 { 672 struct thread *td = curthread; 673 struct lwp *lp = td->td_lwp; 674 struct proc *p = td->td_proc; 675 struct file *fp; 676 size_t len; 677 int error; 678 struct socket *so; 679 #ifdef KTRACE 680 struct iovec *ktriov = NULL; 681 struct uio ktruio; 682 #endif 683 684 error = holdsock(p->p_fd, s, &fp); 685 if (error) 686 return (error); 687 #ifdef KTRACE 688 if (KTRPOINT(td, KTR_GENIO)) { 689 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 690 691 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 692 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 693 ktruio = *auio; 694 } 695 #endif 696 len = auio->uio_resid; 697 so = (struct socket *)fp->f_data; 698 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 699 if (fp->f_flag & FNONBLOCK) 700 flags |= MSG_FNONBLOCKING; 701 } 702 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); 703 if (error) { 704 if (auio->uio_resid != len && (error == ERESTART || 705 error == EINTR || error == EWOULDBLOCK)) 706 error = 0; 707 if (error == EPIPE && !(flags & MSG_NOSIGNAL) && 708 !(so->so_options & SO_NOSIGPIPE)) 709 lwpsignal(p, lp, SIGPIPE); 710 } 711 #ifdef KTRACE 712 if (ktriov != NULL) { 713 if (error == 0) { 714 ktruio.uio_iov = ktriov; 715 ktruio.uio_resid = len - auio->uio_resid; 716 ktrgenio(lp, s, UIO_WRITE, &ktruio, error); 717 } 718 kfree(ktriov, M_TEMP); 719 } 720 #endif 721 if (error == 0) 722 *res = len - auio->uio_resid; 723 fdrop(fp); 724 return (error); 725 } 726 727 /* 728 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen) 729 * 730 * MPALMOSTSAFE 731 */ 732 int 733 sys_sendto(struct sendto_args *uap) 734 { 735 struct thread *td = curthread; 736 struct uio auio; 737 struct iovec aiov; 738 struct sockaddr *sa = NULL; 739 int error; 740 741 if (uap->to) { 742 error = getsockaddr(&sa, uap->to, uap->tolen); 743 if (error) 744 return (error); 745 } 746 aiov.iov_base = uap->buf; 747 aiov.iov_len = uap->len; 748 auio.uio_iov = &aiov; 749 auio.uio_iovcnt = 1; 750 auio.uio_offset = 0; 751 auio.uio_resid = uap->len; 752 auio.uio_segflg = UIO_USERSPACE; 753 auio.uio_rw = UIO_WRITE; 754 auio.uio_td = td; 755 756 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags, 757 &uap->sysmsg_szresult); 758 759 if (sa) 760 kfree(sa, M_SONAME); 761 return (error); 762 } 763 764 /* 765 * sendmsg_args(int s, caddr_t msg, int flags) 766 * 767 * MPALMOSTSAFE 768 */ 769 int 770 sys_sendmsg(struct sendmsg_args *uap) 771 { 772 struct thread *td = curthread; 773 struct msghdr msg; 774 struct uio auio; 775 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 776 struct sockaddr *sa = NULL; 777 struct mbuf *control = NULL; 778 int error; 779 780 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg)); 781 if (error) 782 return (error); 783 784 /* 785 * Conditionally copyin msg.msg_name. 786 */ 787 if (msg.msg_name) { 788 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen); 789 if (error) 790 return (error); 791 } 792 793 /* 794 * Populate auio. 795 */ 796 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 797 &auio.uio_resid); 798 if (error) 799 goto cleanup2; 800 auio.uio_iov = iov; 801 auio.uio_iovcnt = msg.msg_iovlen; 802 auio.uio_offset = 0; 803 auio.uio_segflg = UIO_USERSPACE; 804 auio.uio_rw = UIO_WRITE; 805 auio.uio_td = td; 806 807 /* 808 * Conditionally copyin msg.msg_control. 809 */ 810 if (msg.msg_control) { 811 if (msg.msg_controllen < sizeof(struct cmsghdr) || 812 msg.msg_controllen > MLEN) { 813 error = EINVAL; 814 goto cleanup; 815 } 816 control = m_get(M_WAITOK, MT_CONTROL); 817 if (control == NULL) { 818 error = ENOBUFS; 819 goto cleanup; 820 } 821 control->m_len = msg.msg_controllen; 822 error = copyin(msg.msg_control, mtod(control, caddr_t), 823 msg.msg_controllen); 824 if (error) { 825 m_free(control); 826 goto cleanup; 827 } 828 } 829 830 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, 831 &uap->sysmsg_szresult); 832 833 cleanup: 834 iovec_free(&iov, aiov); 835 cleanup2: 836 if (sa) 837 kfree(sa, M_SONAME); 838 return (error); 839 } 840 841 /* 842 * kern_recvmsg() takes a handle to sa and control. If the handle is non- 843 * null, it returns a dynamically allocated struct sockaddr and an mbuf. 844 * Don't forget to FREE() and m_free() these if they are returned. 845 */ 846 int 847 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, 848 struct mbuf **control, int *flags, size_t *res) 849 { 850 struct thread *td = curthread; 851 struct proc *p = td->td_proc; 852 struct file *fp; 853 size_t len; 854 int error; 855 int lflags; 856 struct socket *so; 857 #ifdef KTRACE 858 struct iovec *ktriov = NULL; 859 struct uio ktruio; 860 #endif 861 862 error = holdsock(p->p_fd, s, &fp); 863 if (error) 864 return (error); 865 #ifdef KTRACE 866 if (KTRPOINT(td, KTR_GENIO)) { 867 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 868 869 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 870 bcopy(auio->uio_iov, ktriov, iovlen); 871 ktruio = *auio; 872 } 873 #endif 874 len = auio->uio_resid; 875 so = (struct socket *)fp->f_data; 876 877 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 878 if (fp->f_flag & FNONBLOCK) { 879 if (flags) { 880 *flags |= MSG_FNONBLOCKING; 881 } else { 882 lflags = MSG_FNONBLOCKING; 883 flags = &lflags; 884 } 885 } 886 } 887 888 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 889 if (error) { 890 if (auio->uio_resid != len && (error == ERESTART || 891 error == EINTR || error == EWOULDBLOCK)) 892 error = 0; 893 } 894 #ifdef KTRACE 895 if (ktriov != NULL) { 896 if (error == 0) { 897 ktruio.uio_iov = ktriov; 898 ktruio.uio_resid = len - auio->uio_resid; 899 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 900 } 901 kfree(ktriov, M_TEMP); 902 } 903 #endif 904 if (error == 0) 905 *res = len - auio->uio_resid; 906 fdrop(fp); 907 return (error); 908 } 909 910 /* 911 * recvfrom_args(int s, caddr_t buf, size_t len, int flags, 912 * caddr_t from, int *fromlenaddr) 913 * 914 * MPALMOSTSAFE 915 */ 916 int 917 sys_recvfrom(struct recvfrom_args *uap) 918 { 919 struct thread *td = curthread; 920 struct uio auio; 921 struct iovec aiov; 922 struct sockaddr *sa = NULL; 923 int error, fromlen; 924 925 if (uap->from && uap->fromlenaddr) { 926 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); 927 if (error) 928 return (error); 929 if (fromlen < 0) 930 return (EINVAL); 931 } else { 932 fromlen = 0; 933 } 934 aiov.iov_base = uap->buf; 935 aiov.iov_len = uap->len; 936 auio.uio_iov = &aiov; 937 auio.uio_iovcnt = 1; 938 auio.uio_offset = 0; 939 auio.uio_resid = uap->len; 940 auio.uio_segflg = UIO_USERSPACE; 941 auio.uio_rw = UIO_READ; 942 auio.uio_td = td; 943 944 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, 945 &uap->flags, &uap->sysmsg_szresult); 946 947 if (error == 0 && uap->from) { 948 /* note: sa may still be NULL */ 949 if (sa) { 950 fromlen = MIN(fromlen, sa->sa_len); 951 error = copyout(sa, uap->from, fromlen); 952 } else { 953 fromlen = 0; 954 } 955 if (error == 0) { 956 error = copyout(&fromlen, uap->fromlenaddr, 957 sizeof(fromlen)); 958 } 959 } 960 if (sa) 961 kfree(sa, M_SONAME); 962 963 return (error); 964 } 965 966 /* 967 * recvmsg_args(int s, struct msghdr *msg, int flags) 968 * 969 * MPALMOSTSAFE 970 */ 971 int 972 sys_recvmsg(struct recvmsg_args *uap) 973 { 974 struct thread *td = curthread; 975 struct msghdr msg; 976 struct uio auio; 977 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 978 struct mbuf *m, *control = NULL; 979 struct sockaddr *sa = NULL; 980 caddr_t ctlbuf; 981 socklen_t *ufromlenp, *ucontrollenp; 982 int error, fromlen, controllen, len, flags, *uflagsp; 983 984 /* 985 * This copyin handles everything except the iovec. 986 */ 987 error = copyin(uap->msg, &msg, sizeof(msg)); 988 if (error) 989 return (error); 990 991 if (msg.msg_name && msg.msg_namelen < 0) 992 return (EINVAL); 993 if (msg.msg_control && msg.msg_controllen < 0) 994 return (EINVAL); 995 996 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 997 msg_namelen)); 998 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 999 msg_controllen)); 1000 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, 1001 msg_flags)); 1002 1003 /* 1004 * Populate auio. 1005 */ 1006 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 1007 &auio.uio_resid); 1008 if (error) 1009 return (error); 1010 auio.uio_iov = iov; 1011 auio.uio_iovcnt = msg.msg_iovlen; 1012 auio.uio_offset = 0; 1013 auio.uio_segflg = UIO_USERSPACE; 1014 auio.uio_rw = UIO_READ; 1015 auio.uio_td = td; 1016 1017 flags = uap->flags; 1018 1019 error = kern_recvmsg(uap->s, 1020 (msg.msg_name ? &sa : NULL), &auio, 1021 (msg.msg_control ? &control : NULL), &flags, 1022 &uap->sysmsg_szresult); 1023 1024 /* 1025 * Conditionally copyout the name and populate the namelen field. 1026 */ 1027 if (error == 0 && msg.msg_name) { 1028 /* note: sa may still be NULL */ 1029 if (sa != NULL) { 1030 fromlen = MIN(msg.msg_namelen, sa->sa_len); 1031 error = copyout(sa, msg.msg_name, fromlen); 1032 } else { 1033 fromlen = 0; 1034 } 1035 if (error == 0) 1036 error = copyout(&fromlen, ufromlenp, 1037 sizeof(*ufromlenp)); 1038 } 1039 1040 /* 1041 * Copyout msg.msg_control and msg.msg_controllen. 1042 */ 1043 if (error == 0 && msg.msg_control) { 1044 len = msg.msg_controllen; 1045 m = control; 1046 ctlbuf = (caddr_t)msg.msg_control; 1047 1048 while(m && len > 0) { 1049 unsigned int tocopy; 1050 1051 if (len >= m->m_len) { 1052 tocopy = m->m_len; 1053 } else { 1054 msg.msg_flags |= MSG_CTRUNC; 1055 tocopy = len; 1056 } 1057 1058 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); 1059 if (error) 1060 goto cleanup; 1061 1062 ctlbuf += tocopy; 1063 len -= tocopy; 1064 m = m->m_next; 1065 } 1066 controllen = ctlbuf - (caddr_t)msg.msg_control; 1067 error = copyout(&controllen, ucontrollenp, 1068 sizeof(*ucontrollenp)); 1069 } 1070 1071 if (error == 0) 1072 error = copyout(&flags, uflagsp, sizeof(*uflagsp)); 1073 1074 cleanup: 1075 if (sa) 1076 kfree(sa, M_SONAME); 1077 iovec_free(&iov, aiov); 1078 if (control) 1079 m_freem(control); 1080 return (error); 1081 } 1082 1083 /* 1084 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1085 * in kernel pointer instead of a userland pointer. This allows us 1086 * to manipulate socket options in the emulation code. 1087 */ 1088 int 1089 kern_setsockopt(int s, struct sockopt *sopt) 1090 { 1091 struct thread *td = curthread; 1092 struct proc *p = td->td_proc; 1093 struct file *fp; 1094 int error; 1095 1096 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1097 return (EFAULT); 1098 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1099 return (EINVAL); 1100 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1101 return (EINVAL); 1102 1103 error = holdsock(p->p_fd, s, &fp); 1104 if (error) 1105 return (error); 1106 1107 error = sosetopt((struct socket *)fp->f_data, sopt); 1108 fdrop(fp); 1109 return (error); 1110 } 1111 1112 /* 1113 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) 1114 * 1115 * MPALMOSTSAFE 1116 */ 1117 int 1118 sys_setsockopt(struct setsockopt_args *uap) 1119 { 1120 struct thread *td = curthread; 1121 struct sockopt sopt; 1122 int error; 1123 1124 sopt.sopt_level = uap->level; 1125 sopt.sopt_name = uap->name; 1126 sopt.sopt_valsize = uap->valsize; 1127 sopt.sopt_td = td; 1128 sopt.sopt_val = NULL; 1129 1130 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1131 return (EINVAL); 1132 if (uap->val) { 1133 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1134 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1135 if (error) 1136 goto out; 1137 } 1138 1139 error = kern_setsockopt(uap->s, &sopt); 1140 out: 1141 if (uap->val) 1142 kfree(sopt.sopt_val, M_TEMP); 1143 return(error); 1144 } 1145 1146 /* 1147 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1148 * in kernel pointer instead of a userland pointer. This allows us 1149 * to manipulate socket options in the emulation code. 1150 */ 1151 int 1152 kern_getsockopt(int s, struct sockopt *sopt) 1153 { 1154 struct thread *td = curthread; 1155 struct proc *p = td->td_proc; 1156 struct file *fp; 1157 int error; 1158 1159 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1160 return (EFAULT); 1161 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1162 return (EINVAL); 1163 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1164 return (EINVAL); 1165 1166 error = holdsock(p->p_fd, s, &fp); 1167 if (error) 1168 return (error); 1169 1170 error = sogetopt((struct socket *)fp->f_data, sopt); 1171 fdrop(fp); 1172 return (error); 1173 } 1174 1175 /* 1176 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) 1177 * 1178 * MPALMOSTSAFE 1179 */ 1180 int 1181 sys_getsockopt(struct getsockopt_args *uap) 1182 { 1183 struct thread *td = curthread; 1184 struct sockopt sopt; 1185 int error, valsize; 1186 1187 if (uap->val) { 1188 error = copyin(uap->avalsize, &valsize, sizeof(valsize)); 1189 if (error) 1190 return (error); 1191 } else { 1192 valsize = 0; 1193 } 1194 1195 sopt.sopt_level = uap->level; 1196 sopt.sopt_name = uap->name; 1197 sopt.sopt_valsize = valsize; 1198 sopt.sopt_td = td; 1199 sopt.sopt_val = NULL; 1200 1201 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1202 return (EINVAL); 1203 if (uap->val) { 1204 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1205 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1206 if (error) 1207 goto out; 1208 } 1209 1210 error = kern_getsockopt(uap->s, &sopt); 1211 if (error) 1212 goto out; 1213 valsize = sopt.sopt_valsize; 1214 error = copyout(&valsize, uap->avalsize, sizeof(valsize)); 1215 if (error) 1216 goto out; 1217 if (uap->val) 1218 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); 1219 out: 1220 if (uap->val) 1221 kfree(sopt.sopt_val, M_TEMP); 1222 return (error); 1223 } 1224 1225 /* 1226 * The second argument to kern_getsockname() is a handle to a struct sockaddr. 1227 * This allows kern_getsockname() to return a pointer to an allocated struct 1228 * sockaddr which must be freed later with FREE(). The caller must 1229 * initialize *name to NULL. 1230 */ 1231 int 1232 kern_getsockname(int s, struct sockaddr **name, int *namelen) 1233 { 1234 struct thread *td = curthread; 1235 struct proc *p = td->td_proc; 1236 struct file *fp; 1237 struct socket *so; 1238 struct sockaddr *sa = NULL; 1239 int error; 1240 1241 error = holdsock(p->p_fd, s, &fp); 1242 if (error) 1243 return (error); 1244 if (*namelen < 0) { 1245 fdrop(fp); 1246 return (EINVAL); 1247 } 1248 so = (struct socket *)fp->f_data; 1249 error = so_pru_sockaddr(so, &sa); 1250 if (error == 0) { 1251 if (sa == NULL) { 1252 *namelen = 0; 1253 } else { 1254 *namelen = MIN(*namelen, sa->sa_len); 1255 *name = sa; 1256 } 1257 } 1258 1259 fdrop(fp); 1260 return (error); 1261 } 1262 1263 /* 1264 * getsockname_args(int fdes, caddr_t asa, int *alen) 1265 * 1266 * Get socket name. 1267 * 1268 * MPALMOSTSAFE 1269 */ 1270 int 1271 sys_getsockname(struct getsockname_args *uap) 1272 { 1273 struct sockaddr *sa = NULL; 1274 int error, sa_len; 1275 1276 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1277 if (error) 1278 return (error); 1279 1280 error = kern_getsockname(uap->fdes, &sa, &sa_len); 1281 1282 if (error == 0) 1283 error = copyout(sa, uap->asa, sa_len); 1284 if (error == 0) 1285 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1286 if (sa) 1287 kfree(sa, M_SONAME); 1288 return (error); 1289 } 1290 1291 /* 1292 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1293 * This allows kern_getpeername() to return a pointer to an allocated struct 1294 * sockaddr which must be freed later with FREE(). The caller must 1295 * initialize *name to NULL. 1296 */ 1297 int 1298 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1299 { 1300 struct thread *td = curthread; 1301 struct proc *p = td->td_proc; 1302 struct file *fp; 1303 struct socket *so; 1304 struct sockaddr *sa = NULL; 1305 int error; 1306 1307 error = holdsock(p->p_fd, s, &fp); 1308 if (error) 1309 return (error); 1310 if (*namelen < 0) { 1311 fdrop(fp); 1312 return (EINVAL); 1313 } 1314 so = (struct socket *)fp->f_data; 1315 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1316 fdrop(fp); 1317 return (ENOTCONN); 1318 } 1319 error = so_pru_peeraddr(so, &sa); 1320 if (error == 0) { 1321 if (sa == NULL) { 1322 *namelen = 0; 1323 } else { 1324 *namelen = MIN(*namelen, sa->sa_len); 1325 *name = sa; 1326 } 1327 } 1328 1329 fdrop(fp); 1330 return (error); 1331 } 1332 1333 /* 1334 * getpeername_args(int fdes, caddr_t asa, int *alen) 1335 * 1336 * Get name of peer for connected socket. 1337 * 1338 * MPALMOSTSAFE 1339 */ 1340 int 1341 sys_getpeername(struct getpeername_args *uap) 1342 { 1343 struct sockaddr *sa = NULL; 1344 int error, sa_len; 1345 1346 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1347 if (error) 1348 return (error); 1349 1350 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1351 1352 if (error == 0) 1353 error = copyout(sa, uap->asa, sa_len); 1354 if (error == 0) 1355 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1356 if (sa) 1357 kfree(sa, M_SONAME); 1358 return (error); 1359 } 1360 1361 int 1362 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1363 { 1364 struct sockaddr *sa; 1365 int error; 1366 1367 *namp = NULL; 1368 if (len > SOCK_MAXADDRLEN) 1369 return ENAMETOOLONG; 1370 if (len < offsetof(struct sockaddr, sa_data[0])) 1371 return EDOM; 1372 sa = kmalloc(len, M_SONAME, M_WAITOK); 1373 error = copyin(uaddr, sa, len); 1374 if (error) { 1375 kfree(sa, M_SONAME); 1376 } else { 1377 #if BYTE_ORDER != BIG_ENDIAN 1378 /* 1379 * The bind(), connect(), and sendto() syscalls were not 1380 * versioned for COMPAT_43. Thus, this check must stay. 1381 */ 1382 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1383 sa->sa_family = sa->sa_len; 1384 #endif 1385 sa->sa_len = len; 1386 *namp = sa; 1387 } 1388 return error; 1389 } 1390 1391 /* 1392 * Detach a mapped page and release resources back to the system. 1393 * We must release our wiring and if the object is ripped out 1394 * from under the vm_page we become responsible for freeing the 1395 * page. 1396 * 1397 * MPSAFE 1398 */ 1399 static void 1400 sf_buf_mfree(void *arg) 1401 { 1402 struct sf_buf *sf = arg; 1403 vm_page_t m; 1404 1405 m = sf_buf_page(sf); 1406 if (sf_buf_free(sf)) { 1407 /* sf invalid now */ 1408 /* 1409 vm_page_busy_wait(m, FALSE, "sockpgf"); 1410 vm_page_wakeup(m); 1411 */ 1412 vm_page_unhold(m); 1413 #if 0 1414 if (m->object == NULL && 1415 m->wire_count == 0 && 1416 (m->flags & PG_NEED_COMMIT) == 0) { 1417 vm_page_free(m); 1418 } else { 1419 vm_page_wakeup(m); 1420 } 1421 #endif 1422 } 1423 } 1424 1425 /* 1426 * sendfile(2). 1427 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1428 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1429 * 1430 * Send a file specified by 'fd' and starting at 'offset' to a socket 1431 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1432 * nbytes == 0. Optionally add a header and/or trailer to the socket 1433 * output. If specified, write the total number of bytes sent into *sbytes. 1434 * 1435 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1436 * the headers to count against the remaining bytes to be sent from 1437 * the file descriptor. We may wish to implement a compatibility syscall 1438 * in the future. 1439 * 1440 * MPALMOSTSAFE 1441 */ 1442 int 1443 sys_sendfile(struct sendfile_args *uap) 1444 { 1445 struct thread *td = curthread; 1446 struct proc *p = td->td_proc; 1447 struct file *fp; 1448 struct vnode *vp = NULL; 1449 struct sf_hdtr hdtr; 1450 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1451 struct uio auio; 1452 struct mbuf *mheader = NULL; 1453 size_t hbytes = 0; 1454 size_t tbytes; 1455 off_t hdtr_size = 0; 1456 off_t sbytes; 1457 int error; 1458 1459 KKASSERT(p); 1460 1461 /* 1462 * Do argument checking. Must be a regular file in, stream 1463 * type and connected socket out, positive offset. 1464 */ 1465 fp = holdfp(p->p_fd, uap->fd, FREAD); 1466 if (fp == NULL) { 1467 return (EBADF); 1468 } 1469 if (fp->f_type != DTYPE_VNODE) { 1470 fdrop(fp); 1471 return (EINVAL); 1472 } 1473 vp = (struct vnode *)fp->f_data; 1474 vref(vp); 1475 fdrop(fp); 1476 1477 /* 1478 * If specified, get the pointer to the sf_hdtr struct for 1479 * any headers/trailers. 1480 */ 1481 if (uap->hdtr) { 1482 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1483 if (error) 1484 goto done; 1485 /* 1486 * Send any headers. 1487 */ 1488 if (hdtr.headers) { 1489 error = iovec_copyin(hdtr.headers, &iov, aiov, 1490 hdtr.hdr_cnt, &hbytes); 1491 if (error) 1492 goto done; 1493 auio.uio_iov = iov; 1494 auio.uio_iovcnt = hdtr.hdr_cnt; 1495 auio.uio_offset = 0; 1496 auio.uio_segflg = UIO_USERSPACE; 1497 auio.uio_rw = UIO_WRITE; 1498 auio.uio_td = td; 1499 auio.uio_resid = hbytes; 1500 1501 mheader = m_uiomove(&auio); 1502 1503 iovec_free(&iov, aiov); 1504 if (mheader == NULL) 1505 goto done; 1506 } 1507 } 1508 1509 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1510 &sbytes, uap->flags); 1511 if (error) 1512 goto done; 1513 1514 /* 1515 * Send trailers. Wimp out and use writev(2). 1516 */ 1517 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1518 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1519 hdtr.trl_cnt, &auio.uio_resid); 1520 if (error) 1521 goto done; 1522 auio.uio_iov = iov; 1523 auio.uio_iovcnt = hdtr.trl_cnt; 1524 auio.uio_offset = 0; 1525 auio.uio_segflg = UIO_USERSPACE; 1526 auio.uio_rw = UIO_WRITE; 1527 auio.uio_td = td; 1528 1529 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1530 1531 iovec_free(&iov, aiov); 1532 if (error) 1533 goto done; 1534 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1535 } 1536 1537 done: 1538 if (vp) 1539 vrele(vp); 1540 if (uap->sbytes != NULL) { 1541 sbytes += hdtr_size; 1542 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1543 } 1544 return (error); 1545 } 1546 1547 int 1548 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1549 struct mbuf *mheader, off_t *sbytes, int flags) 1550 { 1551 struct thread *td = curthread; 1552 struct proc *p = td->td_proc; 1553 struct vm_object *obj; 1554 struct socket *so; 1555 struct file *fp; 1556 struct mbuf *m, *mp; 1557 struct sf_buf *sf; 1558 struct vm_page *pg; 1559 off_t off, xfsize, xbytes; 1560 off_t hbytes = 0; 1561 int error = 0; 1562 1563 if (vp->v_type != VREG) { 1564 error = EINVAL; 1565 goto done0; 1566 } 1567 if ((obj = vp->v_object) == NULL) { 1568 error = EINVAL; 1569 goto done0; 1570 } 1571 error = holdsock(p->p_fd, sfd, &fp); 1572 if (error) 1573 goto done0; 1574 so = (struct socket *)fp->f_data; 1575 if (so->so_type != SOCK_STREAM) { 1576 error = EINVAL; 1577 goto done; 1578 } 1579 if ((so->so_state & SS_ISCONNECTED) == 0) { 1580 error = ENOTCONN; 1581 goto done; 1582 } 1583 if (offset < 0) { 1584 error = EINVAL; 1585 goto done; 1586 } 1587 1588 /* 1589 * preallocation is required for asynchronous passing of mbufs, 1590 * otherwise we can wind up building up an infinite number of 1591 * mbufs during the asynchronous latency. 1592 */ 1593 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1594 error = EINVAL; 1595 goto done; 1596 } 1597 1598 *sbytes = 0; 1599 xbytes = 0; 1600 /* 1601 * Protect against multiple writers to the socket. 1602 */ 1603 ssb_lock(&so->so_snd, M_WAITOK); 1604 1605 /* 1606 * Loop through the pages in the file, starting with the requested 1607 * offset. Get a file page (do I/O if necessary), map the file page 1608 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1609 * it on the socket. 1610 */ 1611 for (off = offset; ; off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1612 vm_pindex_t pindex; 1613 vm_offset_t pgoff; 1614 long space; 1615 1616 pindex = OFF_TO_IDX(off); 1617 retry_lookup: 1618 /* 1619 * Calculate the amount to transfer. Not to exceed a page, 1620 * the EOF, or the passed in nbytes. 1621 */ 1622 xfsize = vp->v_filesize - off; 1623 if (xfsize > PAGE_SIZE) 1624 xfsize = PAGE_SIZE; 1625 pgoff = (vm_offset_t)(off & PAGE_MASK); 1626 if (PAGE_SIZE - pgoff < xfsize) 1627 xfsize = PAGE_SIZE - pgoff; 1628 if (nbytes && xfsize > (nbytes - xbytes)) 1629 xfsize = nbytes - xbytes; 1630 if (xfsize <= 0) 1631 break; 1632 /* 1633 * Optimize the non-blocking case by looking at the socket space 1634 * before going to the extra work of constituting the sf_buf. 1635 */ 1636 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1637 space = ssb_space_prealloc(&so->so_snd); 1638 else 1639 space = ssb_space(&so->so_snd); 1640 1641 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1642 if (so->so_state & SS_CANTSENDMORE) 1643 error = EPIPE; 1644 else 1645 error = EAGAIN; 1646 ssb_unlock(&so->so_snd); 1647 goto done; 1648 } 1649 /* 1650 * Attempt to look up the page. 1651 * 1652 * Allocate if not found, wait and loop if busy, then hold the page. 1653 * We hold rather than wire the page because we do not want to prevent 1654 * filesystem truncation operations from occuring on the file. This 1655 * can happen even under normal operation if the file being sent is 1656 * remove()d after the sendfile() call completes, because the socket buffer 1657 * may still be draining. tmpfs will crash if we try to use wire. 1658 */ 1659 vm_object_hold(obj); 1660 pg = vm_page_lookup_busy_try(obj, pindex, TRUE, &error); 1661 if (error) { 1662 vm_page_sleep_busy(pg, TRUE, "sfpbsy"); 1663 vm_object_drop(obj); 1664 goto retry_lookup; 1665 } 1666 if (pg == NULL) { 1667 pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL | 1668 VM_ALLOC_NULL_OK); 1669 if (pg == NULL) { 1670 vm_wait(0); 1671 vm_object_drop(obj); 1672 goto retry_lookup; 1673 } 1674 } 1675 vm_page_hold(pg); 1676 vm_object_drop(obj); 1677 1678 /* 1679 * If page is not valid for what we need, initiate I/O 1680 */ 1681 1682 if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) { 1683 struct uio auio; 1684 struct iovec aiov; 1685 int bsize; 1686 1687 /* 1688 * Ensure that our page is still around when the I/O 1689 * completes. 1690 * 1691 * Ensure that our page is not modified while part of 1692 * a mbuf as this could mess up tcp checksums, DMA, 1693 * etc (XXX NEEDS WORK). The softbusy is supposed to 1694 * help here but it actually doesn't. 1695 * 1696 * XXX THIS HAS MULTIPLE PROBLEMS. The underlying 1697 * VM pages are not protected by the soft-busy 1698 * unless we vm_page_protect... READ them, and 1699 * they STILL aren't protected against 1700 * modification via the buffer cache (VOP_WRITE). 1701 * 1702 * Fixing the second issue is particularly 1703 * difficult. 1704 * 1705 * XXX We also can't soft-busy anyway because it can 1706 * deadlock against the syncer doing a vfs_msync(), 1707 * vfs_msync->vmntvnodesca->vfs_msync_scan2-> 1708 * vm_object_page_clean->(scan)-> ... page 1709 * busy-wait. 1710 */ 1711 /*vm_page_io_start(pg);*/ 1712 vm_page_wakeup(pg); 1713 1714 /* 1715 * Get the page from backing store. 1716 */ 1717 bsize = vp->v_mount->mnt_stat.f_iosize; 1718 auio.uio_iov = &aiov; 1719 auio.uio_iovcnt = 1; 1720 aiov.iov_base = 0; 1721 aiov.iov_len = MAXBSIZE; 1722 auio.uio_resid = MAXBSIZE; 1723 auio.uio_offset = trunc_page(off); 1724 auio.uio_segflg = UIO_NOCOPY; 1725 auio.uio_rw = UIO_READ; 1726 auio.uio_td = td; 1727 vn_lock(vp, LK_SHARED | LK_RETRY); 1728 error = VOP_READ(vp, &auio, 1729 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1730 td->td_ucred); 1731 vn_unlock(vp); 1732 vm_page_flag_clear(pg, PG_ZERO); 1733 vm_page_busy_wait(pg, FALSE, "sockpg"); 1734 /*vm_page_io_finish(pg);*/ 1735 if (error) { 1736 vm_page_wakeup(pg); 1737 vm_page_unhold(pg); 1738 /* vm_page_try_to_free(pg); */ 1739 ssb_unlock(&so->so_snd); 1740 goto done; 1741 } 1742 } 1743 1744 1745 /* 1746 * Get a sendfile buf. We usually wait as long as necessary, 1747 * but this wait can be interrupted. 1748 */ 1749 if ((sf = sf_buf_alloc(pg)) == NULL) { 1750 vm_page_wakeup(pg); 1751 vm_page_unhold(pg); 1752 /* vm_page_try_to_free(pg); */ 1753 ssb_unlock(&so->so_snd); 1754 error = EINTR; 1755 goto done; 1756 } 1757 1758 /* 1759 * Get an mbuf header and set it up as having external storage. 1760 */ 1761 MGETHDR(m, M_WAITOK, MT_DATA); 1762 if (m == NULL) { 1763 error = ENOBUFS; 1764 vm_page_wakeup(pg); 1765 vm_page_unhold(pg); 1766 /* vm_page_try_to_free(pg); */ 1767 sf_buf_free(sf); 1768 ssb_unlock(&so->so_snd); 1769 goto done; 1770 } 1771 1772 vm_page_wakeup(pg); 1773 1774 m->m_ext.ext_free = sf_buf_mfree; 1775 m->m_ext.ext_ref = sf_buf_ref; 1776 m->m_ext.ext_arg = sf; 1777 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1778 m->m_ext.ext_size = PAGE_SIZE; 1779 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1780 m->m_flags |= M_EXT; 1781 m->m_pkthdr.len = m->m_len = xfsize; 1782 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1783 1784 if (mheader != NULL) { 1785 hbytes = mheader->m_pkthdr.len; 1786 mheader->m_pkthdr.len += m->m_pkthdr.len; 1787 m_cat(mheader, m); 1788 m = mheader; 1789 mheader = NULL; 1790 } else 1791 hbytes = 0; 1792 1793 /* 1794 * Add the buffer to the socket buffer chain. 1795 */ 1796 crit_enter(); 1797 retry_space: 1798 /* 1799 * Make sure that the socket is still able to take more data. 1800 * CANTSENDMORE being true usually means that the connection 1801 * was closed. so_error is true when an error was sensed after 1802 * a previous send. 1803 * The state is checked after the page mapping and buffer 1804 * allocation above since those operations may block and make 1805 * any socket checks stale. From this point forward, nothing 1806 * blocks before the pru_send (or more accurately, any blocking 1807 * results in a loop back to here to re-check). 1808 */ 1809 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1810 if (so->so_state & SS_CANTSENDMORE) { 1811 error = EPIPE; 1812 } else { 1813 error = so->so_error; 1814 so->so_error = 0; 1815 } 1816 m_freem(m); 1817 ssb_unlock(&so->so_snd); 1818 crit_exit(); 1819 goto done; 1820 } 1821 /* 1822 * Wait for socket space to become available. We do this just 1823 * after checking the connection state above in order to avoid 1824 * a race condition with ssb_wait(). 1825 */ 1826 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1827 space = ssb_space_prealloc(&so->so_snd); 1828 else 1829 space = ssb_space(&so->so_snd); 1830 1831 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1832 if (fp->f_flag & FNONBLOCK) { 1833 m_freem(m); 1834 ssb_unlock(&so->so_snd); 1835 crit_exit(); 1836 error = EAGAIN; 1837 goto done; 1838 } 1839 error = ssb_wait(&so->so_snd); 1840 /* 1841 * An error from ssb_wait usually indicates that we've 1842 * been interrupted by a signal. If we've sent anything 1843 * then return bytes sent, otherwise return the error. 1844 */ 1845 if (error) { 1846 m_freem(m); 1847 ssb_unlock(&so->so_snd); 1848 crit_exit(); 1849 goto done; 1850 } 1851 goto retry_space; 1852 } 1853 1854 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1855 for (mp = m; mp != NULL; mp = mp->m_next) 1856 ssb_preallocstream(&so->so_snd, mp); 1857 } 1858 if (use_sendfile_async) 1859 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1860 else 1861 error = so_pru_send(so, 0, m, NULL, NULL, td); 1862 1863 crit_exit(); 1864 if (error) { 1865 ssb_unlock(&so->so_snd); 1866 goto done; 1867 } 1868 } 1869 if (mheader != NULL) { 1870 *sbytes += mheader->m_pkthdr.len; 1871 1872 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1873 for (mp = mheader; mp != NULL; mp = mp->m_next) 1874 ssb_preallocstream(&so->so_snd, mp); 1875 } 1876 if (use_sendfile_async) 1877 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1878 else 1879 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1880 1881 mheader = NULL; 1882 } 1883 ssb_unlock(&so->so_snd); 1884 1885 done: 1886 fdrop(fp); 1887 done0: 1888 if (mheader != NULL) 1889 m_freem(mheader); 1890 return (error); 1891 } 1892