Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_syscalls.c
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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 * 4. 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 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/5.4/sys/kern/uipc_syscalls.c 145335 2005-04-20 19:11:07Z cvs2svn $"); 37 38 #include "opt_compat.h" 39 #include "opt_ktrace.h" 40 #include "opt_mac.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mac.h> 47 #include <sys/mutex.h> 48 #include <sys/sysproto.h> 49 #include <sys/malloc.h> 50 #include <sys/filedesc.h> 51 #include <sys/event.h> 52 #include <sys/proc.h> 53 #include <sys/fcntl.h> 54 #include <sys/file.h> 55 #include <sys/filio.h> 56 #include <sys/mount.h> 57 #include <sys/mbuf.h> 58 #include <sys/protosw.h> 59 #include <sys/sf_buf.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/signalvar.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysctl.h> 65 #include <sys/uio.h> 66 #include <sys/vnode.h> 67 #ifdef KTRACE 68 #include <sys/ktrace.h> 69 #endif 70 71 #include <vm/vm.h> 72 #include <vm/vm_object.h> 73 #include <vm/vm_page.h> 74 #include <vm/vm_pageout.h> 75 #include <vm/vm_kern.h> 76 #include <vm/vm_extern.h> 77 78 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags); 79 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp); 80 81 static int accept1(struct thread *td, struct accept_args *uap, int compat); 82 static int do_sendfile(struct thread *td, struct sendfile_args *uap, int compat); 83 static int getsockname1(struct thread *td, struct getsockname_args *uap, 84 int compat); 85 static int getpeername1(struct thread *td, struct getpeername_args *uap, 86 int compat); 87 88 /* 89 * NSFBUFS-related variables and associated sysctls 90 */ 91 int nsfbufs; 92 int nsfbufspeak; 93 int nsfbufsused; 94 95 SYSCTL_DECL(_kern_ipc); 96 SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufs, CTLFLAG_RDTUN, &nsfbufs, 0, 97 "Maximum number of sendfile(2) sf_bufs available"); 98 SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufspeak, CTLFLAG_RD, &nsfbufspeak, 0, 99 "Number of sendfile(2) sf_bufs at peak usage"); 100 SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufsused, CTLFLAG_RD, &nsfbufsused, 0, 101 "Number of sendfile(2) sf_bufs in use"); 102 103 /* 104 * Convert a user file descriptor to a kernel file entry. A reference on the 105 * file entry is held upon returning. This is lighter weight than 106 * fgetsock(), which bumps the socket reference drops the file reference 107 * count instead, as this approach avoids several additional mutex operations 108 * associated with the additional reference count. 109 */ 110 static int 111 getsock(struct filedesc *fdp, int fd, struct file **fpp) 112 { 113 struct file *fp; 114 int error; 115 116 fp = NULL; 117 if (fdp == NULL) 118 error = EBADF; 119 else { 120 FILEDESC_LOCK_FAST(fdp); 121 fp = fget_locked(fdp, fd); 122 if (fp == NULL) 123 error = EBADF; 124 else if (fp->f_type != DTYPE_SOCKET) { 125 fp = NULL; 126 error = ENOTSOCK; 127 } else { 128 fhold(fp); 129 error = 0; 130 } 131 FILEDESC_UNLOCK_FAST(fdp); 132 } 133 *fpp = fp; 134 return (error); 135 } 136 137 /* 138 * System call interface to the socket abstraction. 139 */ 140 #if defined(COMPAT_43) 141 #define COMPAT_OLDSOCK 142 #endif 143 144 /* 145 * MPSAFE 146 */ 147 int 148 socket(td, uap) 149 struct thread *td; 150 register struct socket_args /* { 151 int domain; 152 int type; 153 int protocol; 154 } */ *uap; 155 { 156 struct filedesc *fdp; 157 struct socket *so; 158 struct file *fp; 159 int fd, error; 160 161 fdp = td->td_proc->p_fd; 162 error = falloc(td, &fp, &fd); 163 if (error) 164 return (error); 165 /* An extra reference on `fp' has been held for us by falloc(). */ 166 NET_LOCK_GIANT(); 167 error = socreate(uap->domain, &so, uap->type, uap->protocol, 168 td->td_ucred, td); 169 NET_UNLOCK_GIANT(); 170 if (error) { 171 fdclose(fdp, fp, fd, td); 172 } else { 173 FILEDESC_LOCK_FAST(fdp); 174 fp->f_data = so; /* already has ref count */ 175 fp->f_flag = FREAD|FWRITE; 176 fp->f_ops = &socketops; 177 fp->f_type = DTYPE_SOCKET; 178 FILEDESC_UNLOCK_FAST(fdp); 179 td->td_retval[0] = fd; 180 } 181 fdrop(fp, td); 182 return (error); 183 } 184 185 /* 186 * MPSAFE 187 */ 188 /* ARGSUSED */ 189 int 190 bind(td, uap) 191 struct thread *td; 192 register struct bind_args /* { 193 int s; 194 caddr_t name; 195 int namelen; 196 } */ *uap; 197 { 198 struct sockaddr *sa; 199 int error; 200 201 if ((error = getsockaddr(&sa, uap->name, uap->namelen)) != 0) 202 return (error); 203 204 return (kern_bind(td, uap->s, sa)); 205 } 206 207 int 208 kern_bind(td, fd, sa) 209 struct thread *td; 210 int fd; 211 struct sockaddr *sa; 212 { 213 struct socket *so; 214 struct file *fp; 215 int error; 216 217 NET_LOCK_GIANT(); 218 error = getsock(td->td_proc->p_fd, fd, &fp); 219 if (error) 220 goto done2; 221 so = fp->f_data; 222 #ifdef MAC 223 SOCK_LOCK(so); 224 error = mac_check_socket_bind(td->td_ucred, so, sa); 225 SOCK_UNLOCK(so); 226 if (error) 227 goto done1; 228 #endif 229 error = sobind(so, sa, td); 230 #ifdef MAC 231 done1: 232 #endif 233 fdrop(fp, td); 234 done2: 235 NET_UNLOCK_GIANT(); 236 FREE(sa, M_SONAME); 237 return (error); 238 } 239 240 /* 241 * MPSAFE 242 */ 243 /* ARGSUSED */ 244 int 245 listen(td, uap) 246 struct thread *td; 247 register struct listen_args /* { 248 int s; 249 int backlog; 250 } */ *uap; 251 { 252 struct socket *so; 253 struct file *fp; 254 int error; 255 256 NET_LOCK_GIANT(); 257 error = getsock(td->td_proc->p_fd, uap->s, &fp); 258 if (error == 0) { 259 so = fp->f_data; 260 #ifdef MAC 261 SOCK_LOCK(so); 262 error = mac_check_socket_listen(td->td_ucred, so); 263 SOCK_UNLOCK(so); 264 if (error) 265 goto done; 266 #endif 267 error = solisten(so, uap->backlog, td); 268 #ifdef MAC 269 done: 270 #endif 271 fdrop(fp, td); 272 } 273 NET_UNLOCK_GIANT(); 274 return(error); 275 } 276 277 /* 278 * accept1() 279 * MPSAFE 280 */ 281 static int 282 accept1(td, uap, compat) 283 struct thread *td; 284 register struct accept_args /* { 285 int s; 286 struct sockaddr * __restrict name; 287 socklen_t * __restrict anamelen; 288 } */ *uap; 289 int compat; 290 { 291 struct filedesc *fdp; 292 struct file *nfp = NULL; 293 struct sockaddr *sa = NULL; 294 socklen_t namelen; 295 int error; 296 struct socket *head, *so; 297 int fd; 298 u_int fflag; 299 pid_t pgid; 300 int tmp; 301 302 fdp = td->td_proc->p_fd; 303 if (uap->name) { 304 error = copyin(uap->anamelen, &namelen, sizeof (namelen)); 305 if(error) 306 return (error); 307 if (namelen < 0) 308 return (EINVAL); 309 } 310 NET_LOCK_GIANT(); 311 error = fgetsock(td, uap->s, &head, &fflag); 312 if (error) 313 goto done2; 314 if ((head->so_options & SO_ACCEPTCONN) == 0) { 315 error = EINVAL; 316 goto done; 317 } 318 error = falloc(td, &nfp, &fd); 319 if (error) 320 goto done; 321 ACCEPT_LOCK(); 322 if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) { 323 ACCEPT_UNLOCK(); 324 error = EWOULDBLOCK; 325 goto noconnection; 326 } 327 while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) { 328 if (head->so_rcv.sb_state & SBS_CANTRCVMORE) { 329 head->so_error = ECONNABORTED; 330 break; 331 } 332 error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH, 333 "accept", 0); 334 if (error) { 335 ACCEPT_UNLOCK(); 336 goto noconnection; 337 } 338 } 339 if (head->so_error) { 340 error = head->so_error; 341 head->so_error = 0; 342 ACCEPT_UNLOCK(); 343 goto noconnection; 344 } 345 so = TAILQ_FIRST(&head->so_comp); 346 KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP")); 347 KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP")); 348 349 /* 350 * Before changing the flags on the socket, we have to bump the 351 * reference count. Otherwise, if the protocol calls sofree(), 352 * the socket will be released due to a zero refcount. 353 */ 354 SOCK_LOCK(so); /* soref() and so_state update */ 355 soref(so); /* file descriptor reference */ 356 357 TAILQ_REMOVE(&head->so_comp, so, so_list); 358 head->so_qlen--; 359 so->so_state |= (head->so_state & SS_NBIO); 360 so->so_qstate &= ~SQ_COMP; 361 so->so_head = NULL; 362 363 SOCK_UNLOCK(so); 364 ACCEPT_UNLOCK(); 365 366 /* An extra reference on `nfp' has been held for us by falloc(). */ 367 td->td_retval[0] = fd; 368 369 /* connection has been removed from the listen queue */ 370 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); 371 372 pgid = fgetown(&head->so_sigio); 373 if (pgid != 0) 374 fsetown(pgid, &so->so_sigio); 375 376 FILE_LOCK(nfp); 377 nfp->f_data = so; /* nfp has ref count from falloc */ 378 nfp->f_flag = fflag; 379 nfp->f_ops = &socketops; 380 nfp->f_type = DTYPE_SOCKET; 381 FILE_UNLOCK(nfp); 382 /* Sync socket nonblocking/async state with file flags */ 383 tmp = fflag & FNONBLOCK; 384 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td); 385 tmp = fflag & FASYNC; 386 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td); 387 sa = 0; 388 error = soaccept(so, &sa); 389 if (error) { 390 /* 391 * return a namelen of zero for older code which might 392 * ignore the return value from accept. 393 */ 394 if (uap->name != NULL) { 395 namelen = 0; 396 (void) copyout(&namelen, 397 uap->anamelen, sizeof(*uap->anamelen)); 398 } 399 goto noconnection; 400 } 401 if (sa == NULL) { 402 namelen = 0; 403 if (uap->name) 404 goto gotnoname; 405 error = 0; 406 goto done; 407 } 408 if (uap->name) { 409 /* check sa_len before it is destroyed */ 410 if (namelen > sa->sa_len) 411 namelen = sa->sa_len; 412 #ifdef COMPAT_OLDSOCK 413 if (compat) 414 ((struct osockaddr *)sa)->sa_family = 415 sa->sa_family; 416 #endif 417 error = copyout(sa, uap->name, (u_int)namelen); 418 if (!error) 419 gotnoname: 420 error = copyout(&namelen, 421 uap->anamelen, sizeof (*uap->anamelen)); 422 } 423 noconnection: 424 if (sa) 425 FREE(sa, M_SONAME); 426 427 /* 428 * close the new descriptor, assuming someone hasn't ripped it 429 * out from under us. 430 */ 431 if (error) 432 fdclose(fdp, nfp, fd, td); 433 434 /* 435 * Release explicitly held references before returning. 436 */ 437 done: 438 if (nfp != NULL) 439 fdrop(nfp, td); 440 fputsock(head); 441 done2: 442 NET_UNLOCK_GIANT(); 443 return (error); 444 } 445 446 /* 447 * MPSAFE (accept1() is MPSAFE) 448 */ 449 int 450 accept(td, uap) 451 struct thread *td; 452 struct accept_args *uap; 453 { 454 455 return (accept1(td, uap, 0)); 456 } 457 458 #ifdef COMPAT_OLDSOCK 459 /* 460 * MPSAFE (accept1() is MPSAFE) 461 */ 462 int 463 oaccept(td, uap) 464 struct thread *td; 465 struct accept_args *uap; 466 { 467 468 return (accept1(td, uap, 1)); 469 } 470 #endif /* COMPAT_OLDSOCK */ 471 472 /* 473 * MPSAFE 474 */ 475 /* ARGSUSED */ 476 int 477 connect(td, uap) 478 struct thread *td; 479 register struct connect_args /* { 480 int s; 481 caddr_t name; 482 int namelen; 483 } */ *uap; 484 { 485 struct sockaddr *sa; 486 int error; 487 488 error = getsockaddr(&sa, uap->name, uap->namelen); 489 if (error) 490 return (error); 491 492 return (kern_connect(td, uap->s, sa)); 493 } 494 495 496 int 497 kern_connect(td, fd, sa) 498 struct thread *td; 499 int fd; 500 struct sockaddr *sa; 501 { 502 struct socket *so; 503 struct file *fp; 504 int error, s; 505 int interrupted = 0; 506 507 NET_LOCK_GIANT(); 508 error = getsock(td->td_proc->p_fd, fd, &fp); 509 if (error) 510 goto done2; 511 so = fp->f_data; 512 if (so->so_state & SS_ISCONNECTING) { 513 error = EALREADY; 514 goto done1; 515 } 516 #ifdef MAC 517 SOCK_LOCK(so); 518 error = mac_check_socket_connect(td->td_ucred, so, sa); 519 SOCK_UNLOCK(so); 520 if (error) 521 goto bad; 522 #endif 523 error = soconnect(so, sa, td); 524 if (error) 525 goto bad; 526 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 527 error = EINPROGRESS; 528 goto done1; 529 } 530 s = splnet(); 531 SOCK_LOCK(so); 532 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 533 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH, 534 "connec", 0); 535 if (error) { 536 if (error == EINTR || error == ERESTART) 537 interrupted = 1; 538 break; 539 } 540 } 541 if (error == 0) { 542 error = so->so_error; 543 so->so_error = 0; 544 } 545 SOCK_UNLOCK(so); 546 splx(s); 547 bad: 548 if (!interrupted) 549 so->so_state &= ~SS_ISCONNECTING; 550 if (error == ERESTART) 551 error = EINTR; 552 done1: 553 fdrop(fp, td); 554 done2: 555 NET_UNLOCK_GIANT(); 556 FREE(sa, M_SONAME); 557 return (error); 558 } 559 560 /* 561 * MPSAFE 562 */ 563 int 564 socketpair(td, uap) 565 struct thread *td; 566 register struct socketpair_args /* { 567 int domain; 568 int type; 569 int protocol; 570 int *rsv; 571 } */ *uap; 572 { 573 register struct filedesc *fdp = td->td_proc->p_fd; 574 struct file *fp1, *fp2; 575 struct socket *so1, *so2; 576 int fd, error, sv[2]; 577 578 NET_LOCK_GIANT(); 579 error = socreate(uap->domain, &so1, uap->type, uap->protocol, 580 td->td_ucred, td); 581 if (error) 582 goto done2; 583 error = socreate(uap->domain, &so2, uap->type, uap->protocol, 584 td->td_ucred, td); 585 if (error) 586 goto free1; 587 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */ 588 error = falloc(td, &fp1, &fd); 589 if (error) 590 goto free2; 591 sv[0] = fd; 592 fp1->f_data = so1; /* so1 already has ref count */ 593 error = falloc(td, &fp2, &fd); 594 if (error) 595 goto free3; 596 fp2->f_data = so2; /* so2 already has ref count */ 597 sv[1] = fd; 598 error = soconnect2(so1, so2); 599 if (error) 600 goto free4; 601 if (uap->type == SOCK_DGRAM) { 602 /* 603 * Datagram socket connection is asymmetric. 604 */ 605 error = soconnect2(so2, so1); 606 if (error) 607 goto free4; 608 } 609 FILE_LOCK(fp1); 610 fp1->f_flag = FREAD|FWRITE; 611 fp1->f_ops = &socketops; 612 fp1->f_type = DTYPE_SOCKET; 613 FILE_UNLOCK(fp1); 614 FILE_LOCK(fp2); 615 fp2->f_flag = FREAD|FWRITE; 616 fp2->f_ops = &socketops; 617 fp2->f_type = DTYPE_SOCKET; 618 FILE_UNLOCK(fp2); 619 error = copyout(sv, uap->rsv, 2 * sizeof (int)); 620 fdrop(fp1, td); 621 fdrop(fp2, td); 622 goto done2; 623 free4: 624 fdclose(fdp, fp2, sv[1], td); 625 fdrop(fp2, td); 626 free3: 627 fdclose(fdp, fp1, sv[0], td); 628 fdrop(fp1, td); 629 free2: 630 (void)soclose(so2); 631 free1: 632 (void)soclose(so1); 633 done2: 634 NET_UNLOCK_GIANT(); 635 return (error); 636 } 637 638 static int 639 sendit(td, s, mp, flags) 640 register struct thread *td; 641 int s; 642 register struct msghdr *mp; 643 int flags; 644 { 645 struct mbuf *control; 646 struct sockaddr *to; 647 int error; 648 649 if (mp->msg_name != NULL) { 650 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); 651 if (error) { 652 to = NULL; 653 goto bad; 654 } 655 mp->msg_name = to; 656 } else { 657 to = NULL; 658 } 659 660 if (mp->msg_control) { 661 if (mp->msg_controllen < sizeof(struct cmsghdr) 662 #ifdef COMPAT_OLDSOCK 663 && mp->msg_flags != MSG_COMPAT 664 #endif 665 ) { 666 error = EINVAL; 667 goto bad; 668 } 669 error = sockargs(&control, mp->msg_control, 670 mp->msg_controllen, MT_CONTROL); 671 if (error) 672 goto bad; 673 #ifdef COMPAT_OLDSOCK 674 if (mp->msg_flags == MSG_COMPAT) { 675 register struct cmsghdr *cm; 676 677 M_PREPEND(control, sizeof(*cm), M_TRYWAIT); 678 if (control == 0) { 679 error = ENOBUFS; 680 goto bad; 681 } else { 682 cm = mtod(control, struct cmsghdr *); 683 cm->cmsg_len = control->m_len; 684 cm->cmsg_level = SOL_SOCKET; 685 cm->cmsg_type = SCM_RIGHTS; 686 } 687 } 688 #endif 689 } else { 690 control = NULL; 691 } 692 693 error = kern_sendit(td, s, mp, flags, control); 694 695 bad: 696 if (to) 697 FREE(to, M_SONAME); 698 return (error); 699 } 700 701 int 702 kern_sendit(td, s, mp, flags, control) 703 struct thread *td; 704 int s; 705 struct msghdr *mp; 706 int flags; 707 struct mbuf *control; 708 { 709 struct file *fp; 710 struct uio auio; 711 struct iovec *iov; 712 struct socket *so; 713 int i; 714 int len, error; 715 #ifdef KTRACE 716 struct uio *ktruio = NULL; 717 #endif 718 719 NET_LOCK_GIANT(); 720 error = getsock(td->td_proc->p_fd, s, &fp); 721 if (error) 722 goto bad2; 723 so = (struct socket *)fp->f_data; 724 725 #ifdef MAC 726 SOCK_LOCK(so); 727 error = mac_check_socket_send(td->td_ucred, so); 728 SOCK_UNLOCK(so); 729 if (error) 730 goto bad; 731 #endif 732 733 auio.uio_iov = mp->msg_iov; 734 auio.uio_iovcnt = mp->msg_iovlen; 735 auio.uio_segflg = UIO_USERSPACE; 736 auio.uio_rw = UIO_WRITE; 737 auio.uio_td = td; 738 auio.uio_offset = 0; /* XXX */ 739 auio.uio_resid = 0; 740 iov = mp->msg_iov; 741 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 742 if ((auio.uio_resid += iov->iov_len) < 0) { 743 error = EINVAL; 744 goto bad; 745 } 746 } 747 #ifdef KTRACE 748 if (KTRPOINT(td, KTR_GENIO)) 749 ktruio = cloneuio(&auio); 750 #endif 751 len = auio.uio_resid; 752 error = so->so_proto->pr_usrreqs->pru_sosend(so, mp->msg_name, &auio, 753 0, control, flags, td); 754 if (error) { 755 if (auio.uio_resid != len && (error == ERESTART || 756 error == EINTR || error == EWOULDBLOCK)) 757 error = 0; 758 /* Generation of SIGPIPE can be controlled per socket */ 759 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE)) { 760 PROC_LOCK(td->td_proc); 761 psignal(td->td_proc, SIGPIPE); 762 PROC_UNLOCK(td->td_proc); 763 } 764 } 765 if (error == 0) 766 td->td_retval[0] = len - auio.uio_resid; 767 #ifdef KTRACE 768 if (ktruio != NULL) { 769 ktruio->uio_resid = td->td_retval[0]; 770 ktrgenio(s, UIO_WRITE, ktruio, error); 771 } 772 #endif 773 bad: 774 fdrop(fp, td); 775 bad2: 776 NET_UNLOCK_GIANT(); 777 return (error); 778 } 779 780 /* 781 * MPSAFE 782 */ 783 int 784 sendto(td, uap) 785 struct thread *td; 786 register struct sendto_args /* { 787 int s; 788 caddr_t buf; 789 size_t len; 790 int flags; 791 caddr_t to; 792 int tolen; 793 } */ *uap; 794 { 795 struct msghdr msg; 796 struct iovec aiov; 797 int error; 798 799 msg.msg_name = uap->to; 800 msg.msg_namelen = uap->tolen; 801 msg.msg_iov = &aiov; 802 msg.msg_iovlen = 1; 803 msg.msg_control = 0; 804 #ifdef COMPAT_OLDSOCK 805 msg.msg_flags = 0; 806 #endif 807 aiov.iov_base = uap->buf; 808 aiov.iov_len = uap->len; 809 error = sendit(td, uap->s, &msg, uap->flags); 810 return (error); 811 } 812 813 #ifdef COMPAT_OLDSOCK 814 /* 815 * MPSAFE 816 */ 817 int 818 osend(td, uap) 819 struct thread *td; 820 register struct osend_args /* { 821 int s; 822 caddr_t buf; 823 int len; 824 int flags; 825 } */ *uap; 826 { 827 struct msghdr msg; 828 struct iovec aiov; 829 int error; 830 831 msg.msg_name = 0; 832 msg.msg_namelen = 0; 833 msg.msg_iov = &aiov; 834 msg.msg_iovlen = 1; 835 aiov.iov_base = uap->buf; 836 aiov.iov_len = uap->len; 837 msg.msg_control = 0; 838 msg.msg_flags = 0; 839 error = sendit(td, uap->s, &msg, uap->flags); 840 return (error); 841 } 842 843 /* 844 * MPSAFE 845 */ 846 int 847 osendmsg(td, uap) 848 struct thread *td; 849 struct osendmsg_args /* { 850 int s; 851 caddr_t msg; 852 int flags; 853 } */ *uap; 854 { 855 struct msghdr msg; 856 struct iovec *iov; 857 int error; 858 859 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 860 if (error) 861 return (error); 862 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 863 if (error) 864 return (error); 865 msg.msg_iov = iov; 866 msg.msg_flags = MSG_COMPAT; 867 error = sendit(td, uap->s, &msg, uap->flags); 868 free(iov, M_IOV); 869 return (error); 870 } 871 #endif 872 873 /* 874 * MPSAFE 875 */ 876 int 877 sendmsg(td, uap) 878 struct thread *td; 879 struct sendmsg_args /* { 880 int s; 881 caddr_t msg; 882 int flags; 883 } */ *uap; 884 { 885 struct msghdr msg; 886 struct iovec *iov; 887 int error; 888 889 error = copyin(uap->msg, &msg, sizeof (msg)); 890 if (error) 891 return (error); 892 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 893 if (error) 894 return (error); 895 msg.msg_iov = iov; 896 #ifdef COMPAT_OLDSOCK 897 msg.msg_flags = 0; 898 #endif 899 error = sendit(td, uap->s, &msg, uap->flags); 900 free(iov, M_IOV); 901 return (error); 902 } 903 904 static int 905 recvit(td, s, mp, namelenp) 906 struct thread *td; 907 int s; 908 struct msghdr *mp; 909 void *namelenp; 910 { 911 struct uio auio; 912 struct iovec *iov; 913 int i; 914 socklen_t len; 915 int error; 916 struct mbuf *m, *control = 0; 917 caddr_t ctlbuf; 918 struct file *fp; 919 struct socket *so; 920 struct sockaddr *fromsa = 0; 921 #ifdef KTRACE 922 struct uio *ktruio = NULL; 923 #endif 924 925 NET_LOCK_GIANT(); 926 error = getsock(td->td_proc->p_fd, s, &fp); 927 if (error) { 928 NET_UNLOCK_GIANT(); 929 return (error); 930 } 931 so = fp->f_data; 932 933 #ifdef MAC 934 SOCK_LOCK(so); 935 error = mac_check_socket_receive(td->td_ucred, so); 936 SOCK_UNLOCK(so); 937 if (error) { 938 fdrop(fp, td); 939 NET_UNLOCK_GIANT(); 940 return (error); 941 } 942 #endif 943 944 auio.uio_iov = mp->msg_iov; 945 auio.uio_iovcnt = mp->msg_iovlen; 946 auio.uio_segflg = UIO_USERSPACE; 947 auio.uio_rw = UIO_READ; 948 auio.uio_td = td; 949 auio.uio_offset = 0; /* XXX */ 950 auio.uio_resid = 0; 951 iov = mp->msg_iov; 952 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 953 if ((auio.uio_resid += iov->iov_len) < 0) { 954 fdrop(fp, td); 955 NET_UNLOCK_GIANT(); 956 return (EINVAL); 957 } 958 } 959 #ifdef KTRACE 960 if (KTRPOINT(td, KTR_GENIO)) 961 ktruio = cloneuio(&auio); 962 #endif 963 len = auio.uio_resid; 964 error = so->so_proto->pr_usrreqs->pru_soreceive(so, &fromsa, &auio, 965 (struct mbuf **)0, mp->msg_control ? &control : (struct mbuf **)0, 966 &mp->msg_flags); 967 if (error) { 968 if (auio.uio_resid != (int)len && (error == ERESTART || 969 error == EINTR || error == EWOULDBLOCK)) 970 error = 0; 971 } 972 #ifdef KTRACE 973 if (ktruio != NULL) { 974 ktruio->uio_resid = (int)len - auio.uio_resid; 975 ktrgenio(s, UIO_READ, ktruio, error); 976 } 977 #endif 978 if (error) 979 goto out; 980 td->td_retval[0] = (int)len - auio.uio_resid; 981 if (mp->msg_name) { 982 len = mp->msg_namelen; 983 if (len <= 0 || fromsa == 0) 984 len = 0; 985 else { 986 /* save sa_len before it is destroyed by MSG_COMPAT */ 987 len = MIN(len, fromsa->sa_len); 988 #ifdef COMPAT_OLDSOCK 989 if (mp->msg_flags & MSG_COMPAT) 990 ((struct osockaddr *)fromsa)->sa_family = 991 fromsa->sa_family; 992 #endif 993 error = copyout(fromsa, mp->msg_name, (unsigned)len); 994 if (error) 995 goto out; 996 } 997 mp->msg_namelen = len; 998 if (namelenp && 999 (error = copyout(&len, namelenp, sizeof (socklen_t)))) { 1000 #ifdef COMPAT_OLDSOCK 1001 if (mp->msg_flags & MSG_COMPAT) 1002 error = 0; /* old recvfrom didn't check */ 1003 else 1004 #endif 1005 goto out; 1006 } 1007 } 1008 if (mp->msg_control) { 1009 #ifdef COMPAT_OLDSOCK 1010 /* 1011 * We assume that old recvmsg calls won't receive access 1012 * rights and other control info, esp. as control info 1013 * is always optional and those options didn't exist in 4.3. 1014 * If we receive rights, trim the cmsghdr; anything else 1015 * is tossed. 1016 */ 1017 if (control && mp->msg_flags & MSG_COMPAT) { 1018 if (mtod(control, struct cmsghdr *)->cmsg_level != 1019 SOL_SOCKET || 1020 mtod(control, struct cmsghdr *)->cmsg_type != 1021 SCM_RIGHTS) { 1022 mp->msg_controllen = 0; 1023 goto out; 1024 } 1025 control->m_len -= sizeof (struct cmsghdr); 1026 control->m_data += sizeof (struct cmsghdr); 1027 } 1028 #endif 1029 len = mp->msg_controllen; 1030 m = control; 1031 mp->msg_controllen = 0; 1032 ctlbuf = mp->msg_control; 1033 1034 while (m && len > 0) { 1035 unsigned int tocopy; 1036 1037 if (len >= m->m_len) 1038 tocopy = m->m_len; 1039 else { 1040 mp->msg_flags |= MSG_CTRUNC; 1041 tocopy = len; 1042 } 1043 1044 if ((error = copyout(mtod(m, caddr_t), 1045 ctlbuf, tocopy)) != 0) 1046 goto out; 1047 1048 ctlbuf += tocopy; 1049 len -= tocopy; 1050 m = m->m_next; 1051 } 1052 mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control; 1053 } 1054 out: 1055 fdrop(fp, td); 1056 NET_UNLOCK_GIANT(); 1057 if (fromsa) 1058 FREE(fromsa, M_SONAME); 1059 if (control) 1060 m_freem(control); 1061 return (error); 1062 } 1063 1064 /* 1065 * MPSAFE 1066 */ 1067 int 1068 recvfrom(td, uap) 1069 struct thread *td; 1070 register struct recvfrom_args /* { 1071 int s; 1072 caddr_t buf; 1073 size_t len; 1074 int flags; 1075 struct sockaddr * __restrict from; 1076 socklen_t * __restrict fromlenaddr; 1077 } */ *uap; 1078 { 1079 struct msghdr msg; 1080 struct iovec aiov; 1081 int error; 1082 1083 if (uap->fromlenaddr) { 1084 error = copyin(uap->fromlenaddr, 1085 &msg.msg_namelen, sizeof (msg.msg_namelen)); 1086 if (error) 1087 goto done2; 1088 } else { 1089 msg.msg_namelen = 0; 1090 } 1091 msg.msg_name = uap->from; 1092 msg.msg_iov = &aiov; 1093 msg.msg_iovlen = 1; 1094 aiov.iov_base = uap->buf; 1095 aiov.iov_len = uap->len; 1096 msg.msg_control = 0; 1097 msg.msg_flags = uap->flags; 1098 error = recvit(td, uap->s, &msg, uap->fromlenaddr); 1099 done2: 1100 return(error); 1101 } 1102 1103 #ifdef COMPAT_OLDSOCK 1104 /* 1105 * MPSAFE 1106 */ 1107 int 1108 orecvfrom(td, uap) 1109 struct thread *td; 1110 struct recvfrom_args *uap; 1111 { 1112 1113 uap->flags |= MSG_COMPAT; 1114 return (recvfrom(td, uap)); 1115 } 1116 #endif 1117 1118 1119 #ifdef COMPAT_OLDSOCK 1120 /* 1121 * MPSAFE 1122 */ 1123 int 1124 orecv(td, uap) 1125 struct thread *td; 1126 register struct orecv_args /* { 1127 int s; 1128 caddr_t buf; 1129 int len; 1130 int flags; 1131 } */ *uap; 1132 { 1133 struct msghdr msg; 1134 struct iovec aiov; 1135 int error; 1136 1137 msg.msg_name = 0; 1138 msg.msg_namelen = 0; 1139 msg.msg_iov = &aiov; 1140 msg.msg_iovlen = 1; 1141 aiov.iov_base = uap->buf; 1142 aiov.iov_len = uap->len; 1143 msg.msg_control = 0; 1144 msg.msg_flags = uap->flags; 1145 error = recvit(td, uap->s, &msg, NULL); 1146 return (error); 1147 } 1148 1149 /* 1150 * Old recvmsg. This code takes advantage of the fact that the old msghdr 1151 * overlays the new one, missing only the flags, and with the (old) access 1152 * rights where the control fields are now. 1153 * 1154 * MPSAFE 1155 */ 1156 int 1157 orecvmsg(td, uap) 1158 struct thread *td; 1159 struct orecvmsg_args /* { 1160 int s; 1161 struct omsghdr *msg; 1162 int flags; 1163 } */ *uap; 1164 { 1165 struct msghdr msg; 1166 struct iovec *iov; 1167 int error; 1168 1169 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 1170 if (error) 1171 return (error); 1172 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 1173 if (error) 1174 return (error); 1175 msg.msg_flags = uap->flags | MSG_COMPAT; 1176 msg.msg_iov = iov; 1177 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen); 1178 if (msg.msg_controllen && error == 0) 1179 error = copyout(&msg.msg_controllen, 1180 &uap->msg->msg_accrightslen, sizeof (int)); 1181 free(iov, M_IOV); 1182 return (error); 1183 } 1184 #endif 1185 1186 /* 1187 * MPSAFE 1188 */ 1189 int 1190 recvmsg(td, uap) 1191 struct thread *td; 1192 struct recvmsg_args /* { 1193 int s; 1194 struct msghdr *msg; 1195 int flags; 1196 } */ *uap; 1197 { 1198 struct msghdr msg; 1199 struct iovec *uiov, *iov; 1200 int error; 1201 1202 error = copyin(uap->msg, &msg, sizeof (msg)); 1203 if (error) 1204 return (error); 1205 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 1206 if (error) 1207 return (error); 1208 msg.msg_flags = uap->flags; 1209 #ifdef COMPAT_OLDSOCK 1210 msg.msg_flags &= ~MSG_COMPAT; 1211 #endif 1212 uiov = msg.msg_iov; 1213 msg.msg_iov = iov; 1214 error = recvit(td, uap->s, &msg, NULL); 1215 if (error == 0) { 1216 msg.msg_iov = uiov; 1217 error = copyout(&msg, uap->msg, sizeof(msg)); 1218 } 1219 free(iov, M_IOV); 1220 return (error); 1221 } 1222 1223 /* 1224 * MPSAFE 1225 */ 1226 /* ARGSUSED */ 1227 int 1228 shutdown(td, uap) 1229 struct thread *td; 1230 register struct shutdown_args /* { 1231 int s; 1232 int how; 1233 } */ *uap; 1234 { 1235 struct socket *so; 1236 struct file *fp; 1237 int error; 1238 1239 NET_LOCK_GIANT(); 1240 error = getsock(td->td_proc->p_fd, uap->s, &fp); 1241 if (error == 0) { 1242 so = fp->f_data; 1243 error = soshutdown(so, uap->how); 1244 fdrop(fp, td); 1245 } 1246 NET_UNLOCK_GIANT(); 1247 return (error); 1248 } 1249 1250 /* 1251 * MPSAFE 1252 */ 1253 /* ARGSUSED */ 1254 int 1255 setsockopt(td, uap) 1256 struct thread *td; 1257 register struct setsockopt_args /* { 1258 int s; 1259 int level; 1260 int name; 1261 caddr_t val; 1262 int valsize; 1263 } */ *uap; 1264 { 1265 1266 return (kern_setsockopt(td, uap->s, uap->level, uap->name, 1267 uap->val, UIO_USERSPACE, uap->valsize)); 1268 } 1269 1270 int 1271 kern_setsockopt(td, s, level, name, val, valseg, valsize) 1272 struct thread *td; 1273 int s; 1274 int level; 1275 int name; 1276 void *val; 1277 enum uio_seg valseg; 1278 socklen_t valsize; 1279 { 1280 int error; 1281 struct socket *so; 1282 struct file *fp; 1283 struct sockopt sopt; 1284 1285 if (val == NULL && valsize != 0) 1286 return (EFAULT); 1287 if (valsize < 0) 1288 return (EINVAL); 1289 1290 sopt.sopt_dir = SOPT_SET; 1291 sopt.sopt_level = level; 1292 sopt.sopt_name = name; 1293 sopt.sopt_val = val; 1294 sopt.sopt_valsize = valsize; 1295 switch (valseg) { 1296 case UIO_USERSPACE: 1297 sopt.sopt_td = td; 1298 break; 1299 case UIO_SYSSPACE: 1300 sopt.sopt_td = NULL; 1301 break; 1302 default: 1303 panic("kern_setsockopt called with bad valseg"); 1304 } 1305 1306 NET_LOCK_GIANT(); 1307 error = getsock(td->td_proc->p_fd, s, &fp); 1308 if (error == 0) { 1309 so = fp->f_data; 1310 error = sosetopt(so, &sopt); 1311 fdrop(fp, td); 1312 } 1313 NET_UNLOCK_GIANT(); 1314 return(error); 1315 } 1316 1317 /* 1318 * MPSAFE 1319 */ 1320 /* ARGSUSED */ 1321 int 1322 getsockopt(td, uap) 1323 struct thread *td; 1324 register struct getsockopt_args /* { 1325 int s; 1326 int level; 1327 int name; 1328 void * __restrict val; 1329 socklen_t * __restrict avalsize; 1330 } */ *uap; 1331 { 1332 socklen_t valsize; 1333 int error; 1334 1335 if (uap->val) { 1336 error = copyin(uap->avalsize, &valsize, sizeof (valsize)); 1337 if (error) 1338 return (error); 1339 } 1340 1341 error = kern_getsockopt(td, uap->s, uap->level, uap->name, 1342 uap->val, UIO_USERSPACE, &valsize); 1343 1344 if (error == 0) 1345 error = copyout(&valsize, uap->avalsize, sizeof (valsize)); 1346 return (error); 1347 } 1348 1349 /* 1350 * Kernel version of getsockopt. 1351 * optval can be a userland or userspace. optlen is always a kernel pointer. 1352 */ 1353 int 1354 kern_getsockopt(td, s, level, name, val, valseg, valsize) 1355 struct thread *td; 1356 int s; 1357 int level; 1358 int name; 1359 void *val; 1360 enum uio_seg valseg; 1361 socklen_t *valsize; 1362 { 1363 int error; 1364 struct socket *so; 1365 struct file *fp; 1366 struct sockopt sopt; 1367 1368 if (val == NULL) 1369 *valsize = 0; 1370 if (*valsize < 0) 1371 return (EINVAL); 1372 1373 sopt.sopt_dir = SOPT_GET; 1374 sopt.sopt_level = level; 1375 sopt.sopt_name = name; 1376 sopt.sopt_val = val; 1377 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */ 1378 switch (valseg) { 1379 case UIO_USERSPACE: 1380 sopt.sopt_td = td; 1381 break; 1382 case UIO_SYSSPACE: 1383 sopt.sopt_td = NULL; 1384 break; 1385 default: 1386 panic("kern_getsockopt called with bad valseg"); 1387 } 1388 1389 NET_LOCK_GIANT(); 1390 error = getsock(td->td_proc->p_fd, s, &fp); 1391 if (error == 0) { 1392 so = fp->f_data; 1393 error = sogetopt(so, &sopt); 1394 *valsize = sopt.sopt_valsize; 1395 fdrop(fp, td); 1396 } 1397 NET_UNLOCK_GIANT(); 1398 return (error); 1399 } 1400 1401 /* 1402 * getsockname1() - Get socket name. 1403 * 1404 * MPSAFE 1405 */ 1406 /* ARGSUSED */ 1407 static int 1408 getsockname1(td, uap, compat) 1409 struct thread *td; 1410 register struct getsockname_args /* { 1411 int fdes; 1412 struct sockaddr * __restrict asa; 1413 socklen_t * __restrict alen; 1414 } */ *uap; 1415 int compat; 1416 { 1417 struct socket *so; 1418 struct sockaddr *sa; 1419 struct file *fp; 1420 socklen_t len; 1421 int error; 1422 1423 NET_LOCK_GIANT(); 1424 error = getsock(td->td_proc->p_fd, uap->fdes, &fp); 1425 if (error) 1426 goto done2; 1427 so = fp->f_data; 1428 error = copyin(uap->alen, &len, sizeof (len)); 1429 if (error) 1430 goto done1; 1431 if (len < 0) { 1432 error = EINVAL; 1433 goto done1; 1434 } 1435 sa = 0; 1436 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa); 1437 if (error) 1438 goto bad; 1439 if (sa == 0) { 1440 len = 0; 1441 goto gotnothing; 1442 } 1443 1444 len = MIN(len, sa->sa_len); 1445 #ifdef COMPAT_OLDSOCK 1446 if (compat) 1447 ((struct osockaddr *)sa)->sa_family = sa->sa_family; 1448 #endif 1449 error = copyout(sa, uap->asa, (u_int)len); 1450 if (error == 0) 1451 gotnothing: 1452 error = copyout(&len, uap->alen, sizeof (len)); 1453 bad: 1454 if (sa) 1455 FREE(sa, M_SONAME); 1456 done1: 1457 fdrop(fp, td); 1458 done2: 1459 NET_UNLOCK_GIANT(); 1460 return (error); 1461 } 1462 1463 /* 1464 * MPSAFE 1465 */ 1466 int 1467 getsockname(td, uap) 1468 struct thread *td; 1469 struct getsockname_args *uap; 1470 { 1471 1472 return (getsockname1(td, uap, 0)); 1473 } 1474 1475 #ifdef COMPAT_OLDSOCK 1476 /* 1477 * MPSAFE 1478 */ 1479 int 1480 ogetsockname(td, uap) 1481 struct thread *td; 1482 struct getsockname_args *uap; 1483 { 1484 1485 return (getsockname1(td, uap, 1)); 1486 } 1487 #endif /* COMPAT_OLDSOCK */ 1488 1489 /* 1490 * getpeername1() - Get name of peer for connected socket. 1491 * 1492 * MPSAFE 1493 */ 1494 /* ARGSUSED */ 1495 static int 1496 getpeername1(td, uap, compat) 1497 struct thread *td; 1498 register struct getpeername_args /* { 1499 int fdes; 1500 struct sockaddr * __restrict asa; 1501 socklen_t * __restrict alen; 1502 } */ *uap; 1503 int compat; 1504 { 1505 struct socket *so; 1506 struct sockaddr *sa; 1507 struct file *fp; 1508 socklen_t len; 1509 int error; 1510 1511 NET_LOCK_GIANT(); 1512 error = getsock(td->td_proc->p_fd, uap->fdes, &fp); 1513 if (error) 1514 goto done2; 1515 so = fp->f_data; 1516 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1517 error = ENOTCONN; 1518 goto done1; 1519 } 1520 error = copyin(uap->alen, &len, sizeof (len)); 1521 if (error) 1522 goto done1; 1523 if (len < 0) { 1524 error = EINVAL; 1525 goto done1; 1526 } 1527 sa = 0; 1528 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, &sa); 1529 if (error) 1530 goto bad; 1531 if (sa == 0) { 1532 len = 0; 1533 goto gotnothing; 1534 } 1535 len = MIN(len, sa->sa_len); 1536 #ifdef COMPAT_OLDSOCK 1537 if (compat) 1538 ((struct osockaddr *)sa)->sa_family = 1539 sa->sa_family; 1540 #endif 1541 error = copyout(sa, uap->asa, (u_int)len); 1542 if (error) 1543 goto bad; 1544 gotnothing: 1545 error = copyout(&len, uap->alen, sizeof (len)); 1546 bad: 1547 if (sa) 1548 FREE(sa, M_SONAME); 1549 done1: 1550 fdrop(fp, td); 1551 done2: 1552 NET_UNLOCK_GIANT(); 1553 return (error); 1554 } 1555 1556 /* 1557 * MPSAFE 1558 */ 1559 int 1560 getpeername(td, uap) 1561 struct thread *td; 1562 struct getpeername_args *uap; 1563 { 1564 1565 return (getpeername1(td, uap, 0)); 1566 } 1567 1568 #ifdef COMPAT_OLDSOCK 1569 /* 1570 * MPSAFE 1571 */ 1572 int 1573 ogetpeername(td, uap) 1574 struct thread *td; 1575 struct ogetpeername_args *uap; 1576 { 1577 1578 /* XXX uap should have type `getpeername_args *' to begin with. */ 1579 return (getpeername1(td, (struct getpeername_args *)uap, 1)); 1580 } 1581 #endif /* COMPAT_OLDSOCK */ 1582 1583 int 1584 sockargs(mp, buf, buflen, type) 1585 struct mbuf **mp; 1586 caddr_t buf; 1587 int buflen, type; 1588 { 1589 register struct sockaddr *sa; 1590 register struct mbuf *m; 1591 int error; 1592 1593 if ((u_int)buflen > MLEN) { 1594 #ifdef COMPAT_OLDSOCK 1595 if (type == MT_SONAME && (u_int)buflen <= 112) 1596 buflen = MLEN; /* unix domain compat. hack */ 1597 else 1598 #endif 1599 if ((u_int)buflen > MCLBYTES) 1600 return (EINVAL); 1601 } 1602 m = m_get(M_TRYWAIT, type); 1603 if (m == NULL) 1604 return (ENOBUFS); 1605 if ((u_int)buflen > MLEN) { 1606 MCLGET(m, M_TRYWAIT); 1607 if ((m->m_flags & M_EXT) == 0) { 1608 m_free(m); 1609 return (ENOBUFS); 1610 } 1611 } 1612 m->m_len = buflen; 1613 error = copyin(buf, mtod(m, caddr_t), (u_int)buflen); 1614 if (error) 1615 (void) m_free(m); 1616 else { 1617 *mp = m; 1618 if (type == MT_SONAME) { 1619 sa = mtod(m, struct sockaddr *); 1620 1621 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1622 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1623 sa->sa_family = sa->sa_len; 1624 #endif 1625 sa->sa_len = buflen; 1626 } 1627 } 1628 return (error); 1629 } 1630 1631 int 1632 getsockaddr(namp, uaddr, len) 1633 struct sockaddr **namp; 1634 caddr_t uaddr; 1635 size_t len; 1636 { 1637 struct sockaddr *sa; 1638 int error; 1639 1640 if (len > SOCK_MAXADDRLEN) 1641 return (ENAMETOOLONG); 1642 if (len < offsetof(struct sockaddr, sa_data[0])) 1643 return (EINVAL); 1644 MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK); 1645 error = copyin(uaddr, sa, len); 1646 if (error) { 1647 FREE(sa, M_SONAME); 1648 } else { 1649 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1650 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1651 sa->sa_family = sa->sa_len; 1652 #endif 1653 sa->sa_len = len; 1654 *namp = sa; 1655 } 1656 return (error); 1657 } 1658 1659 /* 1660 * Detach mapped page and release resources back to the system. 1661 */ 1662 void 1663 sf_buf_mext(void *addr, void *args) 1664 { 1665 vm_page_t m; 1666 1667 m = sf_buf_page(args); 1668 sf_buf_free(args); 1669 vm_page_lock_queues(); 1670 vm_page_unwire(m, 0); 1671 /* 1672 * Check for the object going away on us. This can 1673 * happen since we don't hold a reference to it. 1674 * If so, we're responsible for freeing the page. 1675 */ 1676 if (m->wire_count == 0 && m->object == NULL) 1677 vm_page_free(m); 1678 vm_page_unlock_queues(); 1679 } 1680 1681 /* 1682 * sendfile(2) 1683 * 1684 * MPSAFE 1685 * 1686 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1687 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1688 * 1689 * Send a file specified by 'fd' and starting at 'offset' to a socket 1690 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1691 * nbytes == 0. Optionally add a header and/or trailer to the socket 1692 * output. If specified, write the total number of bytes sent into *sbytes. 1693 * 1694 */ 1695 int 1696 sendfile(struct thread *td, struct sendfile_args *uap) 1697 { 1698 1699 return (do_sendfile(td, uap, 0)); 1700 } 1701 1702 #ifdef COMPAT_FREEBSD4 1703 int 1704 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap) 1705 { 1706 struct sendfile_args args; 1707 1708 args.fd = uap->fd; 1709 args.s = uap->s; 1710 args.offset = uap->offset; 1711 args.nbytes = uap->nbytes; 1712 args.hdtr = uap->hdtr; 1713 args.sbytes = uap->sbytes; 1714 args.flags = uap->flags; 1715 1716 return (do_sendfile(td, &args, 1)); 1717 } 1718 #endif /* COMPAT_FREEBSD4 */ 1719 1720 static int 1721 do_sendfile(struct thread *td, struct sendfile_args *uap, int compat) 1722 { 1723 struct vnode *vp; 1724 struct vm_object *obj; 1725 struct socket *so = NULL; 1726 struct mbuf *m, *m_header = NULL; 1727 struct sf_buf *sf; 1728 struct vm_page *pg; 1729 struct writev_args nuap; 1730 struct sf_hdtr hdtr; 1731 struct uio *hdr_uio = NULL; 1732 off_t off, xfsize, hdtr_size, sbytes = 0; 1733 int error, headersize = 0, headersent = 0; 1734 1735 mtx_lock(&Giant); 1736 1737 hdtr_size = 0; 1738 1739 /* 1740 * The descriptor must be a regular file and have a backing VM object. 1741 */ 1742 if ((error = fgetvp_read(td, uap->fd, &vp)) != 0) 1743 goto done; 1744 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1745 VOP_UNLOCK(vp, 0, td); 1746 if (vp->v_type != VREG || VOP_GETVOBJECT(vp, &obj) != 0) { 1747 error = EINVAL; 1748 goto done; 1749 } 1750 if ((error = fgetsock(td, uap->s, &so, NULL)) != 0) 1751 goto done; 1752 if (so->so_type != SOCK_STREAM) { 1753 error = EINVAL; 1754 goto done; 1755 } 1756 if ((so->so_state & SS_ISCONNECTED) == 0) { 1757 error = ENOTCONN; 1758 goto done; 1759 } 1760 if (uap->offset < 0) { 1761 error = EINVAL; 1762 goto done; 1763 } 1764 1765 #ifdef MAC 1766 SOCK_LOCK(so); 1767 error = mac_check_socket_send(td->td_ucred, so); 1768 SOCK_UNLOCK(so); 1769 if (error) 1770 goto done; 1771 #endif 1772 1773 /* 1774 * If specified, get the pointer to the sf_hdtr struct for 1775 * any headers/trailers. 1776 */ 1777 if (uap->hdtr != NULL) { 1778 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1779 if (error) 1780 goto done; 1781 /* 1782 * Send any headers. 1783 */ 1784 if (hdtr.headers != NULL) { 1785 error = copyinuio(hdtr.headers, hdtr.hdr_cnt, &hdr_uio); 1786 if (error) 1787 goto done; 1788 hdr_uio->uio_td = td; 1789 hdr_uio->uio_rw = UIO_WRITE; 1790 if (hdr_uio->uio_resid > 0) { 1791 m_header = m_uiotombuf(hdr_uio, M_DONTWAIT, 0); 1792 if (m_header == NULL) 1793 goto done; 1794 headersize = m_header->m_pkthdr.len; 1795 if (compat) 1796 sbytes += headersize; 1797 } 1798 } 1799 } 1800 1801 /* 1802 * Protect against multiple writers to the socket. 1803 */ 1804 SOCKBUF_LOCK(&so->so_snd); 1805 (void) sblock(&so->so_snd, M_WAITOK); 1806 SOCKBUF_UNLOCK(&so->so_snd); 1807 1808 /* 1809 * Loop through the pages in the file, starting with the requested 1810 * offset. Get a file page (do I/O if necessary), map the file page 1811 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1812 * it on the socket. 1813 */ 1814 for (off = uap->offset; ; off += xfsize, sbytes += xfsize) { 1815 vm_pindex_t pindex; 1816 vm_offset_t pgoff; 1817 1818 pindex = OFF_TO_IDX(off); 1819 VM_OBJECT_LOCK(obj); 1820 retry_lookup: 1821 /* 1822 * Calculate the amount to transfer. Not to exceed a page, 1823 * the EOF, or the passed in nbytes. 1824 */ 1825 xfsize = obj->un_pager.vnp.vnp_size - off; 1826 VM_OBJECT_UNLOCK(obj); 1827 if (xfsize > PAGE_SIZE) 1828 xfsize = PAGE_SIZE; 1829 pgoff = (vm_offset_t)(off & PAGE_MASK); 1830 if (PAGE_SIZE - pgoff < xfsize) 1831 xfsize = PAGE_SIZE - pgoff; 1832 if (uap->nbytes && xfsize > (uap->nbytes - sbytes)) 1833 xfsize = uap->nbytes - sbytes; 1834 if (xfsize <= 0) { 1835 if (m_header != NULL) { 1836 m = m_header; 1837 m_header = NULL; 1838 SOCKBUF_LOCK(&so->so_snd); 1839 goto retry_space; 1840 } else 1841 break; 1842 } 1843 /* 1844 * Optimize the non-blocking case by looking at the socket space 1845 * before going to the extra work of constituting the sf_buf. 1846 */ 1847 SOCKBUF_LOCK(&so->so_snd); 1848 if ((so->so_state & SS_NBIO) && sbspace(&so->so_snd) <= 0) { 1849 if (so->so_snd.sb_state & SBS_CANTSENDMORE) 1850 error = EPIPE; 1851 else 1852 error = EAGAIN; 1853 sbunlock(&so->so_snd); 1854 SOCKBUF_UNLOCK(&so->so_snd); 1855 goto done; 1856 } 1857 SOCKBUF_UNLOCK(&so->so_snd); 1858 VM_OBJECT_LOCK(obj); 1859 /* 1860 * Attempt to look up the page. 1861 * 1862 * Allocate if not found 1863 * 1864 * Wait and loop if busy. 1865 */ 1866 pg = vm_page_lookup(obj, pindex); 1867 1868 if (pg == NULL) { 1869 pg = vm_page_alloc(obj, pindex, VM_ALLOC_NOBUSY | 1870 VM_ALLOC_NORMAL | VM_ALLOC_WIRED); 1871 if (pg == NULL) { 1872 VM_OBJECT_UNLOCK(obj); 1873 VM_WAIT; 1874 VM_OBJECT_LOCK(obj); 1875 goto retry_lookup; 1876 } 1877 vm_page_lock_queues(); 1878 } else { 1879 vm_page_lock_queues(); 1880 if (vm_page_sleep_if_busy(pg, TRUE, "sfpbsy")) 1881 goto retry_lookup; 1882 /* 1883 * Wire the page so it does not get ripped out from 1884 * under us. 1885 */ 1886 vm_page_wire(pg); 1887 } 1888 1889 /* 1890 * If page is not valid for what we need, initiate I/O 1891 */ 1892 1893 if (pg->valid && vm_page_is_valid(pg, pgoff, xfsize)) { 1894 VM_OBJECT_UNLOCK(obj); 1895 } else if (uap->flags & SF_NODISKIO) { 1896 error = EBUSY; 1897 } else { 1898 int bsize, resid; 1899 1900 /* 1901 * Ensure that our page is still around when the I/O 1902 * completes. 1903 */ 1904 vm_page_io_start(pg); 1905 vm_page_unlock_queues(); 1906 VM_OBJECT_UNLOCK(obj); 1907 1908 /* 1909 * Get the page from backing store. 1910 */ 1911 bsize = vp->v_mount->mnt_stat.f_iosize; 1912 vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, td); 1913 /* 1914 * XXXMAC: Because we don't have fp->f_cred here, 1915 * we pass in NOCRED. This is probably wrong, but 1916 * is consistent with our original implementation. 1917 */ 1918 error = vn_rdwr(UIO_READ, vp, NULL, MAXBSIZE, 1919 trunc_page(off), UIO_NOCOPY, IO_NODELOCKED | 1920 IO_VMIO | ((MAXBSIZE / bsize) << IO_SEQSHIFT), 1921 td->td_ucred, NOCRED, &resid, td); 1922 VOP_UNLOCK(vp, 0, td); 1923 VM_OBJECT_LOCK(obj); 1924 vm_page_lock_queues(); 1925 vm_page_io_finish(pg); 1926 if (!error) 1927 VM_OBJECT_UNLOCK(obj); 1928 mbstat.sf_iocnt++; 1929 } 1930 1931 if (error) { 1932 vm_page_unwire(pg, 0); 1933 /* 1934 * See if anyone else might know about this page. 1935 * If not and it is not valid, then free it. 1936 */ 1937 if (pg->wire_count == 0 && pg->valid == 0 && 1938 pg->busy == 0 && !(pg->flags & PG_BUSY) && 1939 pg->hold_count == 0) { 1940 vm_page_free(pg); 1941 } 1942 vm_page_unlock_queues(); 1943 VM_OBJECT_UNLOCK(obj); 1944 SOCKBUF_LOCK(&so->so_snd); 1945 sbunlock(&so->so_snd); 1946 SOCKBUF_UNLOCK(&so->so_snd); 1947 goto done; 1948 } 1949 vm_page_unlock_queues(); 1950 1951 /* 1952 * Get a sendfile buf. We usually wait as long as necessary, 1953 * but this wait can be interrupted. 1954 */ 1955 if ((sf = sf_buf_alloc(pg, SFB_CATCH)) == NULL) { 1956 mbstat.sf_allocfail++; 1957 vm_page_lock_queues(); 1958 vm_page_unwire(pg, 0); 1959 if (pg->wire_count == 0 && pg->object == NULL) 1960 vm_page_free(pg); 1961 vm_page_unlock_queues(); 1962 SOCKBUF_LOCK(&so->so_snd); 1963 sbunlock(&so->so_snd); 1964 SOCKBUF_UNLOCK(&so->so_snd); 1965 error = EINTR; 1966 goto done; 1967 } 1968 1969 /* 1970 * Get an mbuf header and set it up as having external storage. 1971 */ 1972 if (m_header) 1973 MGET(m, M_TRYWAIT, MT_DATA); 1974 else 1975 MGETHDR(m, M_TRYWAIT, MT_DATA); 1976 if (m == NULL) { 1977 error = ENOBUFS; 1978 sf_buf_mext((void *)sf_buf_kva(sf), sf); 1979 SOCKBUF_LOCK(&so->so_snd); 1980 sbunlock(&so->so_snd); 1981 SOCKBUF_UNLOCK(&so->so_snd); 1982 goto done; 1983 } 1984 /* 1985 * Setup external storage for mbuf. 1986 */ 1987 MEXTADD(m, sf_buf_kva(sf), PAGE_SIZE, sf_buf_mext, sf, M_RDONLY, 1988 EXT_SFBUF); 1989 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1990 m->m_pkthdr.len = m->m_len = xfsize; 1991 1992 if (m_header) { 1993 m_cat(m_header, m); 1994 m = m_header; 1995 m_header = NULL; 1996 m_fixhdr(m); 1997 } 1998 1999 /* 2000 * Add the buffer to the socket buffer chain. 2001 */ 2002 SOCKBUF_LOCK(&so->so_snd); 2003 retry_space: 2004 /* 2005 * Make sure that the socket is still able to take more data. 2006 * CANTSENDMORE being true usually means that the connection 2007 * was closed. so_error is true when an error was sensed after 2008 * a previous send. 2009 * The state is checked after the page mapping and buffer 2010 * allocation above since those operations may block and make 2011 * any socket checks stale. From this point forward, nothing 2012 * blocks before the pru_send (or more accurately, any blocking 2013 * results in a loop back to here to re-check). 2014 */ 2015 SOCKBUF_LOCK_ASSERT(&so->so_snd); 2016 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) || so->so_error) { 2017 if (so->so_snd.sb_state & SBS_CANTSENDMORE) { 2018 error = EPIPE; 2019 } else { 2020 error = so->so_error; 2021 so->so_error = 0; 2022 } 2023 m_freem(m); 2024 sbunlock(&so->so_snd); 2025 SOCKBUF_UNLOCK(&so->so_snd); 2026 goto done; 2027 } 2028 /* 2029 * Wait for socket space to become available. We do this just 2030 * after checking the connection state above in order to avoid 2031 * a race condition with sbwait(). 2032 */ 2033 if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) { 2034 if (so->so_state & SS_NBIO) { 2035 m_freem(m); 2036 sbunlock(&so->so_snd); 2037 SOCKBUF_UNLOCK(&so->so_snd); 2038 error = EAGAIN; 2039 goto done; 2040 } 2041 error = sbwait(&so->so_snd); 2042 /* 2043 * An error from sbwait usually indicates that we've 2044 * been interrupted by a signal. If we've sent anything 2045 * then return bytes sent, otherwise return the error. 2046 */ 2047 if (error) { 2048 m_freem(m); 2049 sbunlock(&so->so_snd); 2050 SOCKBUF_UNLOCK(&so->so_snd); 2051 goto done; 2052 } 2053 goto retry_space; 2054 } 2055 SOCKBUF_UNLOCK(&so->so_snd); 2056 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, 0, 0, td); 2057 if (error) { 2058 SOCKBUF_LOCK(&so->so_snd); 2059 sbunlock(&so->so_snd); 2060 SOCKBUF_UNLOCK(&so->so_snd); 2061 goto done; 2062 } 2063 headersent = 1; 2064 } 2065 SOCKBUF_LOCK(&so->so_snd); 2066 sbunlock(&so->so_snd); 2067 SOCKBUF_UNLOCK(&so->so_snd); 2068 2069 /* 2070 * Send trailers. Wimp out and use writev(2). 2071 */ 2072 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 2073 nuap.fd = uap->s; 2074 nuap.iovp = hdtr.trailers; 2075 nuap.iovcnt = hdtr.trl_cnt; 2076 error = writev(td, &nuap); 2077 if (error) 2078 goto done; 2079 if (compat) 2080 sbytes += td->td_retval[0]; 2081 else 2082 hdtr_size += td->td_retval[0]; 2083 } 2084 2085 done: 2086 if (headersent) { 2087 if (!compat) 2088 hdtr_size += headersize; 2089 } else { 2090 if (compat) 2091 sbytes -= headersize; 2092 } 2093 /* 2094 * If there was no error we have to clear td->td_retval[0] 2095 * because it may have been set by writev. 2096 */ 2097 if (error == 0) { 2098 td->td_retval[0] = 0; 2099 } 2100 if (uap->sbytes != NULL) { 2101 if (!compat) 2102 sbytes += hdtr_size; 2103 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 2104 } 2105 if (vp) 2106 vrele(vp); 2107 if (so) 2108 fputsock(so); 2109 if (hdr_uio != NULL) 2110 free(hdr_uio, M_IOV); 2111 if (m_header) 2112 m_freem(m_header); 2113 2114 mtx_unlock(&Giant); 2115 2116 if (error == ERESTART) 2117 error = EINTR; 2118 2119 return (error); 2120 }
Cache object: 77b7950c83995942540d7ad7fc30a630
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