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 #include <sys/jail.h> 61 #ifdef KTRACE 62 #include <sys/ktrace.h> 63 #endif 64 #include <vm/vm.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_page.h> 67 #include <vm/vm_pageout.h> 68 #include <vm/vm_kern.h> 69 #include <vm/vm_extern.h> 70 #include <sys/file2.h> 71 #include <sys/signalvar.h> 72 #include <sys/serialize.h> 73 74 #include <sys/thread2.h> 75 #include <sys/msgport2.h> 76 #include <sys/socketvar2.h> 77 #include <net/netmsg2.h> 78 #include <vm/vm_page2.h> 79 80 extern int use_soaccept_pred_fast; 81 extern int use_sendfile_async; 82 extern int use_soconnect_async; 83 84 /* 85 * System call interface to the socket abstraction. 86 */ 87 88 extern struct fileops socketops; 89 90 /* 91 * socket_args(int domain, int type, int protocol) 92 */ 93 int 94 kern_socket(int domain, int type, int protocol, int *res) 95 { 96 struct thread *td = curthread; 97 struct filedesc *fdp = td->td_proc->p_fd; 98 struct socket *so; 99 struct file *fp; 100 int fd, error; 101 u_int fflags = 0; 102 int oflags = 0; 103 104 KKASSERT(td->td_lwp); 105 106 if (type & SOCK_NONBLOCK) { 107 type &= ~SOCK_NONBLOCK; 108 fflags |= FNONBLOCK; 109 } 110 if (type & SOCK_CLOEXEC) { 111 type &= ~SOCK_CLOEXEC; 112 oflags |= O_CLOEXEC; 113 } 114 115 error = falloc(td->td_lwp, &fp, &fd); 116 if (error) 117 return (error); 118 error = socreate(domain, &so, type, protocol, td); 119 if (error) { 120 fsetfd(fdp, NULL, fd); 121 } else { 122 fp->f_type = DTYPE_SOCKET; 123 fp->f_flag = FREAD | FWRITE | fflags; 124 fp->f_ops = &socketops; 125 fp->f_data = so; 126 if (oflags & O_CLOEXEC) 127 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 128 *res = fd; 129 fsetfd(fdp, fp, fd); 130 } 131 fdrop(fp); 132 return (error); 133 } 134 135 /* 136 * MPALMOSTSAFE 137 */ 138 int 139 sys_socket(struct socket_args *uap) 140 { 141 int error; 142 143 error = kern_socket(uap->domain, uap->type, uap->protocol, 144 &uap->sysmsg_iresult); 145 146 return (error); 147 } 148 149 int 150 kern_bind(int s, struct sockaddr *sa) 151 { 152 struct thread *td = curthread; 153 struct file *fp; 154 int error; 155 156 error = holdsock(td, s, &fp); 157 if (error) 158 return (error); 159 error = sobind((struct socket *)fp->f_data, sa, td); 160 dropfp(td, s, fp); 161 162 return (error); 163 } 164 165 /* 166 * bind_args(int s, caddr_t name, int namelen) 167 * 168 * MPALMOSTSAFE 169 */ 170 int 171 sys_bind(struct bind_args *uap) 172 { 173 struct sockaddr *sa; 174 int error; 175 176 error = getsockaddr(&sa, uap->name, uap->namelen); 177 if (error) 178 return (error); 179 if (!prison_remote_ip(curthread, sa)) { 180 kfree(sa, M_SONAME); 181 return EAFNOSUPPORT; 182 } 183 error = kern_bind(uap->s, sa); 184 kfree(sa, M_SONAME); 185 186 return (error); 187 } 188 189 int 190 kern_listen(int s, int backlog) 191 { 192 struct thread *td = curthread; 193 struct file *fp; 194 int error; 195 196 error = holdsock(td, s, &fp); 197 if (error) 198 return (error); 199 error = solisten((struct socket *)fp->f_data, backlog, td); 200 dropfp(td, s, fp); 201 202 return (error); 203 } 204 205 /* 206 * listen_args(int s, int backlog) 207 * 208 * MPALMOSTSAFE 209 */ 210 int 211 sys_listen(struct listen_args *uap) 212 { 213 int error; 214 215 error = kern_listen(uap->s, uap->backlog); 216 return (error); 217 } 218 219 /* 220 * Returns the accepted socket as well. 221 * 222 * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the 223 * pool token is absolutely required to avoid a sofree() race, 224 * as well as to avoid tailq handling races. 225 */ 226 static boolean_t 227 soaccept_predicate(struct netmsg_so_notify *msg) 228 { 229 struct socket *head = msg->base.nm_so; 230 struct socket *so; 231 232 if (head->so_error != 0) { 233 msg->base.lmsg.ms_error = head->so_error; 234 return (TRUE); 235 } 236 lwkt_getpooltoken(head); 237 if (!TAILQ_EMPTY(&head->so_comp)) { 238 /* Abuse nm_so field as copy in/copy out parameter. XXX JH */ 239 so = TAILQ_FIRST(&head->so_comp); 240 KKASSERT((so->so_state & (SS_INCOMP | SS_COMP)) == SS_COMP); 241 TAILQ_REMOVE(&head->so_comp, so, so_list); 242 head->so_qlen--; 243 soclrstate(so, SS_COMP); 244 245 /* 246 * Keep a reference before clearing the so_head 247 * to avoid racing socket close in netisr. 248 */ 249 soreference(so); 250 so->so_head = NULL; 251 252 lwkt_relpooltoken(head); 253 254 msg->base.lmsg.ms_error = 0; 255 msg->base.nm_so = so; 256 return (TRUE); 257 } 258 lwkt_relpooltoken(head); 259 if (head->so_state & SS_CANTRCVMORE) { 260 msg->base.lmsg.ms_error = ECONNABORTED; 261 return (TRUE); 262 } 263 if (msg->nm_fflags & FNONBLOCK) { 264 msg->base.lmsg.ms_error = EWOULDBLOCK; 265 return (TRUE); 266 } 267 268 return (FALSE); 269 } 270 271 /* 272 * The second argument to kern_accept() is a handle to a struct sockaddr. 273 * This allows kern_accept() to return a pointer to an allocated struct 274 * sockaddr which must be freed later with FREE(). The caller must 275 * initialize *name to NULL. 276 */ 277 int 278 kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res, 279 int sockflags) 280 { 281 struct thread *td = curthread; 282 struct filedesc *fdp = td->td_proc->p_fd; 283 struct file *lfp = NULL; 284 struct file *nfp = NULL; 285 struct sockaddr *sa; 286 struct socket *head, *so; 287 struct netmsg_so_notify msg; 288 int fd; 289 u_int fflag; /* type must match fp->f_flag */ 290 int error, tmp; 291 292 *res = -1; 293 if (name && namelen && *namelen < 0) 294 return (EINVAL); 295 296 error = holdsock(td, s, &lfp); 297 if (error) 298 return (error); 299 300 error = falloc(td->td_lwp, &nfp, &fd); 301 if (error) { /* Probably ran out of file descriptors. */ 302 fdrop(lfp); 303 return (error); 304 } 305 head = (struct socket *)lfp->f_data; 306 if ((head->so_options & SO_ACCEPTCONN) == 0) { 307 error = EINVAL; 308 goto done; 309 } 310 311 if (fflags & O_FBLOCKING) 312 fflags |= lfp->f_flag & ~FNONBLOCK; 313 else if (fflags & O_FNONBLOCKING) 314 fflags |= lfp->f_flag | FNONBLOCK; 315 else 316 fflags = lfp->f_flag; 317 318 if (use_soaccept_pred_fast) { 319 boolean_t pred; 320 321 /* Initialize necessary parts for soaccept_predicate() */ 322 netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL); 323 msg.nm_fflags = fflags; 324 325 lwkt_getpooltoken(head); 326 pred = soaccept_predicate(&msg); 327 lwkt_relpooltoken(head); 328 329 if (pred) { 330 error = msg.base.lmsg.ms_error; 331 if (error) 332 goto done; 333 else 334 goto accepted; 335 } 336 } 337 338 /* optimize for uniprocessor case later XXX JH */ 339 netmsg_init_abortable(&msg.base, head, &curthread->td_msgport, 340 0, netmsg_so_notify, netmsg_so_notify_doabort); 341 msg.nm_predicate = soaccept_predicate; 342 msg.nm_fflags = fflags; 343 msg.nm_etype = NM_REVENT; 344 error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH); 345 if (error) 346 goto done; 347 348 accepted: 349 /* 350 * At this point we have the connection that's ready to be accepted. 351 * 352 * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects 353 * to eat the ref and turn it into a descriptor. 354 */ 355 so = msg.base.nm_so; 356 357 fflag = lfp->f_flag; 358 359 /* connection has been removed from the listen queue */ 360 KNOTE(&head->so_rcv.ssb_kq.ki_note, 0); 361 362 if (sockflags & SOCK_KERN_NOINHERIT) { 363 fflag &= ~(FASYNC | FNONBLOCK); 364 if (sockflags & SOCK_NONBLOCK) 365 fflag |= FNONBLOCK; 366 } else { 367 if (head->so_sigio != NULL) 368 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 369 } 370 371 nfp->f_type = DTYPE_SOCKET; 372 nfp->f_flag = fflag; 373 nfp->f_ops = &socketops; 374 nfp->f_data = so; 375 /* Sync socket async state with file flags */ 376 tmp = fflag & FASYNC; 377 fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL); 378 379 sa = NULL; 380 if (so->so_faddr != NULL) { 381 sa = so->so_faddr; 382 so->so_faddr = NULL; 383 384 soaccept_generic(so); 385 error = 0; 386 } else { 387 error = soaccept(so, &sa); 388 } 389 390 /* 391 * Set the returned name and namelen as applicable. Set the returned 392 * namelen to 0 for older code which might ignore the return value 393 * from accept. 394 */ 395 if (error == 0) { 396 if (sa && name && namelen) { 397 if (*namelen > sa->sa_len) 398 *namelen = sa->sa_len; 399 *name = sa; 400 } else { 401 if (sa) 402 kfree(sa, M_SONAME); 403 } 404 } 405 406 done: 407 /* 408 * If an error occured clear the reserved descriptor, else associate 409 * nfp with it. 410 * 411 * Note that *res is normally ignored if an error is returned but 412 * a syscall message will still have access to the result code. 413 */ 414 if (error) { 415 fsetfd(fdp, NULL, fd); 416 } else { 417 if (sockflags & SOCK_CLOEXEC) 418 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 419 *res = fd; 420 fsetfd(fdp, nfp, fd); 421 } 422 fdrop(nfp); 423 dropfp(td, s, lfp); 424 425 return (error); 426 } 427 428 /* 429 * accept(int s, caddr_t name, int *anamelen) 430 * 431 * MPALMOSTSAFE 432 */ 433 int 434 sys_accept(struct accept_args *uap) 435 { 436 struct sockaddr *sa = NULL; 437 int sa_len; 438 int error; 439 440 if (uap->name) { 441 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 442 if (error) 443 return (error); 444 445 error = kern_accept(uap->s, 0, &sa, &sa_len, 446 &uap->sysmsg_iresult, 0); 447 448 if (error == 0) { 449 prison_local_ip(curthread, sa); 450 error = copyout(sa, uap->name, sa_len); 451 } 452 if (error == 0) { 453 error = copyout(&sa_len, uap->anamelen, 454 sizeof(*uap->anamelen)); 455 } 456 if (sa) 457 kfree(sa, M_SONAME); 458 } else { 459 error = kern_accept(uap->s, 0, NULL, 0, 460 &uap->sysmsg_iresult, 0); 461 } 462 return (error); 463 } 464 465 /* 466 * extaccept(int s, int fflags, caddr_t name, int *anamelen) 467 * 468 * MPALMOSTSAFE 469 */ 470 int 471 sys_extaccept(struct extaccept_args *uap) 472 { 473 struct sockaddr *sa = NULL; 474 int sa_len; 475 int error; 476 int fflags = uap->flags & O_FMASK; 477 478 if (uap->name) { 479 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 480 if (error) 481 return (error); 482 483 error = kern_accept(uap->s, fflags, &sa, &sa_len, 484 &uap->sysmsg_iresult, 0); 485 486 if (error == 0) { 487 prison_local_ip(curthread, sa); 488 error = copyout(sa, uap->name, sa_len); 489 } 490 if (error == 0) { 491 error = copyout(&sa_len, uap->anamelen, 492 sizeof(*uap->anamelen)); 493 } 494 if (sa) 495 kfree(sa, M_SONAME); 496 } else { 497 error = kern_accept(uap->s, fflags, NULL, 0, 498 &uap->sysmsg_iresult, 0); 499 } 500 return (error); 501 } 502 503 /* 504 * accept4(int s, caddr_t name, int *anamelen, int flags) 505 * 506 * MPALMOSTSAFE 507 */ 508 int 509 sys_accept4(struct accept4_args *uap) 510 { 511 struct sockaddr *sa = NULL; 512 int sa_len; 513 int error; 514 int sockflags; 515 516 if (uap->flags & ~(SOCK_NONBLOCK | SOCK_CLOEXEC)) 517 return (EINVAL); 518 sockflags = uap->flags | SOCK_KERN_NOINHERIT; 519 520 if (uap->name) { 521 error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); 522 if (error) 523 return (error); 524 525 error = kern_accept(uap->s, 0, &sa, &sa_len, 526 &uap->sysmsg_iresult, sockflags); 527 528 if (error == 0) { 529 prison_local_ip(curthread, sa); 530 error = copyout(sa, uap->name, sa_len); 531 } 532 if (error == 0) { 533 error = copyout(&sa_len, uap->anamelen, 534 sizeof(*uap->anamelen)); 535 } 536 if (sa) 537 kfree(sa, M_SONAME); 538 } else { 539 error = kern_accept(uap->s, 0, NULL, 0, 540 &uap->sysmsg_iresult, sockflags); 541 } 542 return (error); 543 } 544 545 /* 546 * Returns TRUE if predicate satisfied. 547 */ 548 static boolean_t 549 soconnected_predicate(struct netmsg_so_notify *msg) 550 { 551 struct socket *so = msg->base.nm_so; 552 553 /* check predicate */ 554 if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) { 555 msg->base.lmsg.ms_error = so->so_error; 556 return (TRUE); 557 } 558 559 return (FALSE); 560 } 561 562 int 563 kern_connect(int s, int fflags, struct sockaddr *sa) 564 { 565 struct thread *td = curthread; 566 struct file *fp; 567 struct socket *so; 568 int error, interrupted = 0; 569 570 error = holdsock(td, s, &fp); 571 if (error) 572 return (error); 573 so = (struct socket *)fp->f_data; 574 575 if (fflags & O_FBLOCKING) 576 /* fflags &= ~FNONBLOCK; */; 577 else if (fflags & O_FNONBLOCKING) 578 fflags |= FNONBLOCK; 579 else 580 fflags = fp->f_flag; 581 582 if (so->so_state & SS_ISCONNECTING) { 583 error = EALREADY; 584 goto done; 585 } 586 error = soconnect(so, sa, td, use_soconnect_async ? FALSE : TRUE); 587 if (error) 588 goto bad; 589 if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) { 590 error = EINPROGRESS; 591 goto done; 592 } 593 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 594 struct netmsg_so_notify msg; 595 596 netmsg_init_abortable(&msg.base, so, 597 &curthread->td_msgport, 598 0, 599 netmsg_so_notify, 600 netmsg_so_notify_doabort); 601 msg.nm_predicate = soconnected_predicate; 602 msg.nm_etype = NM_REVENT; 603 error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH); 604 if (error == EINTR || error == ERESTART) 605 interrupted = 1; 606 } 607 if (error == 0) { 608 error = so->so_error; 609 so->so_error = 0; 610 } 611 bad: 612 if (!interrupted) 613 soclrstate(so, SS_ISCONNECTING); 614 if (error == ERESTART) 615 error = EINTR; 616 done: 617 dropfp(td, s, fp); 618 619 return (error); 620 } 621 622 /* 623 * connect_args(int s, caddr_t name, int namelen) 624 * 625 * MPALMOSTSAFE 626 */ 627 int 628 sys_connect(struct connect_args *uap) 629 { 630 struct sockaddr *sa; 631 int error; 632 633 error = getsockaddr(&sa, uap->name, uap->namelen); 634 if (error) 635 return (error); 636 if (!prison_remote_ip(curthread, sa)) { 637 kfree(sa, M_SONAME); 638 return EAFNOSUPPORT; 639 } 640 error = kern_connect(uap->s, 0, sa); 641 kfree(sa, M_SONAME); 642 643 return (error); 644 } 645 646 /* 647 * connect_args(int s, int fflags, caddr_t name, int namelen) 648 * 649 * MPALMOSTSAFE 650 */ 651 int 652 sys_extconnect(struct extconnect_args *uap) 653 { 654 struct sockaddr *sa; 655 int error; 656 int fflags = uap->flags & O_FMASK; 657 658 error = getsockaddr(&sa, uap->name, uap->namelen); 659 if (error) 660 return (error); 661 if (!prison_remote_ip(curthread, sa)) { 662 kfree(sa, M_SONAME); 663 return EAFNOSUPPORT; 664 } 665 error = kern_connect(uap->s, fflags, sa); 666 kfree(sa, M_SONAME); 667 668 return (error); 669 } 670 671 int 672 kern_socketpair(int domain, int type, int protocol, int *sv) 673 { 674 struct thread *td = curthread; 675 struct filedesc *fdp; 676 struct file *fp1, *fp2; 677 struct socket *so1, *so2; 678 int fd1, fd2, error; 679 u_int fflags = 0; 680 int oflags = 0; 681 682 if (type & SOCK_NONBLOCK) { 683 type &= ~SOCK_NONBLOCK; 684 fflags |= FNONBLOCK; 685 } 686 if (type & SOCK_CLOEXEC) { 687 type &= ~SOCK_CLOEXEC; 688 oflags |= O_CLOEXEC; 689 } 690 691 fdp = td->td_proc->p_fd; 692 error = socreate(domain, &so1, type, protocol, td); 693 if (error) 694 return (error); 695 error = socreate(domain, &so2, type, protocol, td); 696 if (error) 697 goto free1; 698 error = falloc(td->td_lwp, &fp1, &fd1); 699 if (error) 700 goto free2; 701 sv[0] = fd1; 702 fp1->f_data = so1; 703 error = falloc(td->td_lwp, &fp2, &fd2); 704 if (error) 705 goto free3; 706 fp2->f_data = so2; 707 sv[1] = fd2; 708 error = soconnect2(so1, so2); 709 if (error) 710 goto free4; 711 if (type == SOCK_DGRAM) { 712 /* 713 * Datagram socket connection is asymmetric. 714 */ 715 error = soconnect2(so2, so1); 716 if (error) 717 goto free4; 718 } 719 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 720 fp1->f_flag = fp2->f_flag = FREAD|FWRITE|fflags; 721 fp1->f_ops = fp2->f_ops = &socketops; 722 if (oflags & O_CLOEXEC) { 723 fdp->fd_files[fd1].fileflags |= UF_EXCLOSE; 724 fdp->fd_files[fd2].fileflags |= UF_EXCLOSE; 725 } 726 fsetfd(fdp, fp1, fd1); 727 fsetfd(fdp, fp2, fd2); 728 fdrop(fp1); 729 fdrop(fp2); 730 return (error); 731 free4: 732 fsetfd(fdp, NULL, fd2); 733 fdrop(fp2); 734 free3: 735 fsetfd(fdp, NULL, fd1); 736 fdrop(fp1); 737 free2: 738 (void)soclose(so2, 0); 739 free1: 740 (void)soclose(so1, 0); 741 return (error); 742 } 743 744 /* 745 * socketpair(int domain, int type, int protocol, int *rsv) 746 */ 747 int 748 sys_socketpair(struct socketpair_args *uap) 749 { 750 int error, sockv[2]; 751 752 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); 753 754 if (error == 0) { 755 error = copyout(sockv, uap->rsv, sizeof(sockv)); 756 757 if (error != 0) { 758 kern_close(sockv[0]); 759 kern_close(sockv[1]); 760 } 761 } 762 763 return (error); 764 } 765 766 int 767 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, 768 struct mbuf *control, int flags, size_t *res) 769 { 770 struct thread *td = curthread; 771 struct lwp *lp = td->td_lwp; 772 struct proc *p = td->td_proc; 773 struct file *fp; 774 size_t len; 775 int error; 776 struct socket *so; 777 #ifdef KTRACE 778 struct iovec *ktriov = NULL; 779 struct uio ktruio; 780 #endif 781 782 error = holdsock(td, s, &fp); 783 if (error) 784 return (error); 785 #ifdef KTRACE 786 if (KTRPOINT(td, KTR_GENIO)) { 787 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 788 789 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 790 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 791 ktruio = *auio; 792 } 793 #endif 794 len = auio->uio_resid; 795 so = (struct socket *)fp->f_data; 796 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 797 if (fp->f_flag & FNONBLOCK) 798 flags |= MSG_FNONBLOCKING; 799 } 800 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); 801 if (error) { 802 if (auio->uio_resid != len && (error == ERESTART || 803 error == EINTR || error == EWOULDBLOCK)) 804 error = 0; 805 if (error == EPIPE && !(flags & MSG_NOSIGNAL) && 806 !(so->so_options & SO_NOSIGPIPE)) 807 lwpsignal(p, lp, SIGPIPE); 808 } 809 #ifdef KTRACE 810 if (ktriov != NULL) { 811 if (error == 0) { 812 ktruio.uio_iov = ktriov; 813 ktruio.uio_resid = len - auio->uio_resid; 814 ktrgenio(lp, s, UIO_WRITE, &ktruio, error); 815 } 816 kfree(ktriov, M_TEMP); 817 } 818 #endif 819 if (error == 0) 820 *res = len - auio->uio_resid; 821 dropfp(td, s, fp); 822 823 return (error); 824 } 825 826 /* 827 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen) 828 * 829 * MPALMOSTSAFE 830 */ 831 int 832 sys_sendto(struct sendto_args *uap) 833 { 834 struct thread *td = curthread; 835 struct uio auio; 836 struct iovec aiov; 837 struct sockaddr *sa = NULL; 838 int error; 839 840 if (uap->to) { 841 error = getsockaddr(&sa, uap->to, uap->tolen); 842 if (error) 843 return (error); 844 if (!prison_remote_ip(curthread, sa)) { 845 kfree(sa, M_SONAME); 846 return EAFNOSUPPORT; 847 } 848 } 849 aiov.iov_base = uap->buf; 850 aiov.iov_len = uap->len; 851 auio.uio_iov = &aiov; 852 auio.uio_iovcnt = 1; 853 auio.uio_offset = 0; 854 auio.uio_resid = uap->len; 855 auio.uio_segflg = UIO_USERSPACE; 856 auio.uio_rw = UIO_WRITE; 857 auio.uio_td = td; 858 859 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags, 860 &uap->sysmsg_szresult); 861 862 if (sa) 863 kfree(sa, M_SONAME); 864 return (error); 865 } 866 867 /* 868 * sendmsg_args(int s, caddr_t msg, int flags) 869 * 870 * MPALMOSTSAFE 871 */ 872 int 873 sys_sendmsg(struct sendmsg_args *uap) 874 { 875 struct thread *td = curthread; 876 struct msghdr msg; 877 struct uio auio; 878 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 879 struct sockaddr *sa = NULL; 880 struct mbuf *control = NULL; 881 int error; 882 883 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg)); 884 if (error) 885 return (error); 886 887 /* 888 * Conditionally copyin msg.msg_name. 889 */ 890 if (msg.msg_name) { 891 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen); 892 if (error) 893 return (error); 894 if (!prison_remote_ip(curthread, sa)) { 895 kfree(sa, M_SONAME); 896 return EAFNOSUPPORT; 897 } 898 } 899 900 /* 901 * Populate auio. 902 */ 903 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 904 &auio.uio_resid); 905 if (error) 906 goto cleanup2; 907 auio.uio_iov = iov; 908 auio.uio_iovcnt = msg.msg_iovlen; 909 auio.uio_offset = 0; 910 auio.uio_segflg = UIO_USERSPACE; 911 auio.uio_rw = UIO_WRITE; 912 auio.uio_td = td; 913 914 /* 915 * Conditionally copyin msg.msg_control. 916 */ 917 if (msg.msg_control) { 918 if (msg.msg_controllen < sizeof(struct cmsghdr) || 919 msg.msg_controllen > MLEN) { 920 error = EINVAL; 921 goto cleanup; 922 } 923 control = m_get(M_WAITOK, MT_CONTROL); 924 if (control == NULL) { 925 error = ENOBUFS; 926 goto cleanup; 927 } 928 control->m_len = msg.msg_controllen; 929 error = copyin(msg.msg_control, mtod(control, caddr_t), 930 msg.msg_controllen); 931 if (error) { 932 m_free(control); 933 goto cleanup; 934 } 935 } 936 937 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, 938 &uap->sysmsg_szresult); 939 940 cleanup: 941 iovec_free(&iov, aiov); 942 cleanup2: 943 if (sa) 944 kfree(sa, M_SONAME); 945 return (error); 946 } 947 948 /* 949 * kern_recvmsg() takes a handle to sa and control. If the handle is non- 950 * null, it returns a dynamically allocated struct sockaddr and an mbuf. 951 * Don't forget to FREE() and m_free() these if they are returned. 952 */ 953 int 954 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, 955 struct mbuf **control, int *flags, size_t *res) 956 { 957 struct thread *td = curthread; 958 struct file *fp; 959 size_t len; 960 int error; 961 int lflags; 962 struct socket *so; 963 #ifdef KTRACE 964 struct iovec *ktriov = NULL; 965 struct uio ktruio; 966 #endif 967 968 error = holdsock(td, s, &fp); 969 if (error) 970 return (error); 971 #ifdef KTRACE 972 if (KTRPOINT(td, KTR_GENIO)) { 973 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 974 975 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 976 bcopy(auio->uio_iov, ktriov, iovlen); 977 ktruio = *auio; 978 } 979 #endif 980 len = auio->uio_resid; 981 so = (struct socket *)fp->f_data; 982 983 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 984 if (fp->f_flag & FNONBLOCK) { 985 if (flags) { 986 *flags |= MSG_FNONBLOCKING; 987 } else { 988 lflags = MSG_FNONBLOCKING; 989 flags = &lflags; 990 } 991 } 992 } 993 994 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 995 if (error) { 996 if (auio->uio_resid != len && (error == ERESTART || 997 error == EINTR || error == EWOULDBLOCK)) 998 error = 0; 999 } 1000 #ifdef KTRACE 1001 if (ktriov != NULL) { 1002 if (error == 0) { 1003 ktruio.uio_iov = ktriov; 1004 ktruio.uio_resid = len - auio->uio_resid; 1005 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 1006 } 1007 kfree(ktriov, M_TEMP); 1008 } 1009 #endif 1010 if (error == 0) 1011 *res = len - auio->uio_resid; 1012 dropfp(td, s, fp); 1013 1014 return (error); 1015 } 1016 1017 /* 1018 * recvfrom_args(int s, caddr_t buf, size_t len, int flags, 1019 * caddr_t from, int *fromlenaddr) 1020 * 1021 * MPALMOSTSAFE 1022 */ 1023 int 1024 sys_recvfrom(struct recvfrom_args *uap) 1025 { 1026 struct thread *td = curthread; 1027 struct uio auio; 1028 struct iovec aiov; 1029 struct sockaddr *sa = NULL; 1030 int error, fromlen; 1031 1032 if (uap->from && uap->fromlenaddr) { 1033 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); 1034 if (error) 1035 return (error); 1036 if (fromlen < 0) 1037 return (EINVAL); 1038 } else { 1039 fromlen = 0; 1040 } 1041 aiov.iov_base = uap->buf; 1042 aiov.iov_len = uap->len; 1043 auio.uio_iov = &aiov; 1044 auio.uio_iovcnt = 1; 1045 auio.uio_offset = 0; 1046 auio.uio_resid = uap->len; 1047 auio.uio_segflg = UIO_USERSPACE; 1048 auio.uio_rw = UIO_READ; 1049 auio.uio_td = td; 1050 1051 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, 1052 &uap->flags, &uap->sysmsg_szresult); 1053 1054 if (error == 0 && uap->from) { 1055 /* note: sa may still be NULL */ 1056 if (sa) { 1057 fromlen = MIN(fromlen, sa->sa_len); 1058 prison_local_ip(curthread, sa); 1059 error = copyout(sa, uap->from, fromlen); 1060 } else { 1061 fromlen = 0; 1062 } 1063 if (error == 0) { 1064 error = copyout(&fromlen, uap->fromlenaddr, 1065 sizeof(fromlen)); 1066 } 1067 } 1068 if (sa) 1069 kfree(sa, M_SONAME); 1070 1071 return (error); 1072 } 1073 1074 /* 1075 * recvmsg_args(int s, struct msghdr *msg, int flags) 1076 * 1077 * MPALMOSTSAFE 1078 */ 1079 int 1080 sys_recvmsg(struct recvmsg_args *uap) 1081 { 1082 struct thread *td = curthread; 1083 struct msghdr msg; 1084 struct uio auio; 1085 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1086 struct mbuf *m, *control = NULL; 1087 struct sockaddr *sa = NULL; 1088 caddr_t ctlbuf; 1089 socklen_t *ufromlenp, *ucontrollenp; 1090 int error, fromlen, controllen, len, flags, *uflagsp; 1091 1092 /* 1093 * This copyin handles everything except the iovec. 1094 */ 1095 error = copyin(uap->msg, &msg, sizeof(msg)); 1096 if (error) 1097 return (error); 1098 1099 if (msg.msg_name && msg.msg_namelen < 0) 1100 return (EINVAL); 1101 if (msg.msg_control && msg.msg_controllen < 0) 1102 return (EINVAL); 1103 1104 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1105 msg_namelen)); 1106 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1107 msg_controllen)); 1108 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, 1109 msg_flags)); 1110 1111 /* 1112 * Populate auio. 1113 */ 1114 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 1115 &auio.uio_resid); 1116 if (error) 1117 return (error); 1118 auio.uio_iov = iov; 1119 auio.uio_iovcnt = msg.msg_iovlen; 1120 auio.uio_offset = 0; 1121 auio.uio_segflg = UIO_USERSPACE; 1122 auio.uio_rw = UIO_READ; 1123 auio.uio_td = td; 1124 1125 flags = uap->flags; 1126 1127 error = kern_recvmsg(uap->s, 1128 (msg.msg_name ? &sa : NULL), &auio, 1129 (msg.msg_control ? &control : NULL), &flags, 1130 &uap->sysmsg_szresult); 1131 1132 /* 1133 * Conditionally copyout the name and populate the namelen field. 1134 */ 1135 if (error == 0 && msg.msg_name) { 1136 /* note: sa may still be NULL */ 1137 if (sa != NULL) { 1138 fromlen = MIN(msg.msg_namelen, sa->sa_len); 1139 prison_local_ip(curthread, sa); 1140 error = copyout(sa, msg.msg_name, fromlen); 1141 } else { 1142 fromlen = 0; 1143 } 1144 if (error == 0) 1145 error = copyout(&fromlen, ufromlenp, 1146 sizeof(*ufromlenp)); 1147 } 1148 1149 /* 1150 * Copyout msg.msg_control and msg.msg_controllen. 1151 */ 1152 if (error == 0 && msg.msg_control) { 1153 len = msg.msg_controllen; 1154 m = control; 1155 ctlbuf = (caddr_t)msg.msg_control; 1156 1157 while(m && len > 0) { 1158 unsigned int tocopy; 1159 1160 if (len >= m->m_len) { 1161 tocopy = m->m_len; 1162 } else { 1163 msg.msg_flags |= MSG_CTRUNC; 1164 tocopy = len; 1165 } 1166 1167 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); 1168 if (error) 1169 goto cleanup; 1170 1171 ctlbuf += tocopy; 1172 len -= tocopy; 1173 m = m->m_next; 1174 } 1175 controllen = ctlbuf - (caddr_t)msg.msg_control; 1176 error = copyout(&controllen, ucontrollenp, 1177 sizeof(*ucontrollenp)); 1178 } 1179 1180 if (error == 0) 1181 error = copyout(&flags, uflagsp, sizeof(*uflagsp)); 1182 1183 cleanup: 1184 if (sa) 1185 kfree(sa, M_SONAME); 1186 iovec_free(&iov, aiov); 1187 if (control) 1188 m_freem(control); 1189 return (error); 1190 } 1191 1192 /* 1193 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1194 * in kernel pointer instead of a userland pointer. This allows us 1195 * to manipulate socket options in the emulation code. 1196 */ 1197 int 1198 kern_setsockopt(int s, struct sockopt *sopt) 1199 { 1200 struct thread *td = curthread; 1201 struct file *fp; 1202 int error; 1203 1204 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1205 return (EFAULT); 1206 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1207 return (EINVAL); 1208 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1209 return (EINVAL); 1210 1211 error = holdsock(td, s, &fp); 1212 if (error) 1213 return (error); 1214 1215 error = sosetopt((struct socket *)fp->f_data, sopt); 1216 dropfp(td, s, fp); 1217 1218 return (error); 1219 } 1220 1221 /* 1222 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) 1223 * 1224 * MPALMOSTSAFE 1225 */ 1226 int 1227 sys_setsockopt(struct setsockopt_args *uap) 1228 { 1229 struct thread *td = curthread; 1230 struct sockopt sopt; 1231 int error; 1232 1233 sopt.sopt_level = uap->level; 1234 sopt.sopt_name = uap->name; 1235 sopt.sopt_valsize = uap->valsize; 1236 sopt.sopt_td = td; 1237 sopt.sopt_val = NULL; 1238 1239 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1240 return (EINVAL); 1241 if (uap->val) { 1242 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1243 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1244 if (error) 1245 goto out; 1246 } 1247 1248 error = kern_setsockopt(uap->s, &sopt); 1249 out: 1250 if (uap->val) 1251 kfree(sopt.sopt_val, M_TEMP); 1252 return(error); 1253 } 1254 1255 /* 1256 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1257 * in kernel pointer instead of a userland pointer. This allows us 1258 * to manipulate socket options in the emulation code. 1259 */ 1260 int 1261 kern_getsockopt(int s, struct sockopt *sopt) 1262 { 1263 struct thread *td = curthread; 1264 struct file *fp; 1265 int error; 1266 1267 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1268 return (EFAULT); 1269 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1270 return (EINVAL); 1271 1272 error = holdsock(td, s, &fp); 1273 if (error) 1274 return (error); 1275 1276 error = sogetopt((struct socket *)fp->f_data, sopt); 1277 dropfp(td, s, fp); 1278 1279 return (error); 1280 } 1281 1282 /* 1283 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) 1284 * 1285 * MPALMOSTSAFE 1286 */ 1287 int 1288 sys_getsockopt(struct getsockopt_args *uap) 1289 { 1290 struct thread *td = curthread; 1291 struct sockopt sopt; 1292 int error, valsize, valszmax, mflag = 0; 1293 1294 if (uap->val) { 1295 error = copyin(uap->avalsize, &valsize, sizeof(valsize)); 1296 if (error) 1297 return (error); 1298 } else { 1299 valsize = 0; 1300 } 1301 1302 sopt.sopt_level = uap->level; 1303 sopt.sopt_name = uap->name; 1304 sopt.sopt_valsize = valsize; 1305 sopt.sopt_td = td; 1306 sopt.sopt_val = NULL; 1307 1308 if (td->td_proc->p_ucred->cr_uid == 0) { 1309 valszmax = SOMAXOPT_SIZE0; 1310 mflag = M_NULLOK; 1311 } else { 1312 valszmax = SOMAXOPT_SIZE; 1313 } 1314 if (sopt.sopt_valsize > valszmax) /* unsigned */ 1315 return (EINVAL); 1316 if (uap->val) { 1317 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, 1318 M_WAITOK | mflag); 1319 if (sopt.sopt_val == NULL) 1320 return (ENOBUFS); 1321 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1322 if (error) 1323 goto out; 1324 } 1325 1326 error = kern_getsockopt(uap->s, &sopt); 1327 if (error) 1328 goto out; 1329 valsize = sopt.sopt_valsize; 1330 error = copyout(&valsize, uap->avalsize, sizeof(valsize)); 1331 if (error) 1332 goto out; 1333 if (uap->val) 1334 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); 1335 out: 1336 if (uap->val) 1337 kfree(sopt.sopt_val, M_TEMP); 1338 return (error); 1339 } 1340 1341 /* 1342 * The second argument to kern_getsockname() is a handle to a struct sockaddr. 1343 * This allows kern_getsockname() to return a pointer to an allocated struct 1344 * sockaddr which must be freed later with FREE(). The caller must 1345 * initialize *name to NULL. 1346 */ 1347 int 1348 kern_getsockname(int s, struct sockaddr **name, int *namelen) 1349 { 1350 struct thread *td = curthread; 1351 struct file *fp; 1352 struct socket *so; 1353 struct sockaddr *sa = NULL; 1354 int error; 1355 1356 error = holdsock(td, s, &fp); 1357 if (error) 1358 return (error); 1359 if (*namelen < 0) { 1360 fdrop(fp); 1361 return (EINVAL); 1362 } 1363 so = (struct socket *)fp->f_data; 1364 error = so_pru_sockaddr(so, &sa); 1365 if (error == 0) { 1366 if (sa == NULL) { 1367 *namelen = 0; 1368 } else { 1369 *namelen = MIN(*namelen, sa->sa_len); 1370 *name = sa; 1371 } 1372 } 1373 dropfp(td, s, fp); 1374 1375 return (error); 1376 } 1377 1378 /* 1379 * getsockname_args(int fdes, caddr_t asa, int *alen) 1380 * 1381 * Get socket name. 1382 * 1383 * MPALMOSTSAFE 1384 */ 1385 int 1386 sys_getsockname(struct getsockname_args *uap) 1387 { 1388 struct sockaddr *sa = NULL; 1389 struct sockaddr satmp; 1390 int error, sa_len_in, sa_len_out; 1391 1392 error = copyin(uap->alen, &sa_len_in, sizeof(sa_len_in)); 1393 if (error) 1394 return (error); 1395 1396 sa_len_out = sa_len_in; 1397 error = kern_getsockname(uap->fdes, &sa, &sa_len_out); 1398 1399 if (error == 0) { 1400 if (sa) { 1401 prison_local_ip(curthread, sa); 1402 error = copyout(sa, uap->asa, sa_len_out); 1403 } else { 1404 /* 1405 * unnamed uipc sockets don't bother storing 1406 * sockaddr, simulate an AF_LOCAL sockaddr. 1407 */ 1408 sa_len_out = sizeof(satmp); 1409 if (sa_len_out > sa_len_in) 1410 sa_len_out = sa_len_in; 1411 if (sa_len_out < 0) 1412 sa_len_out = 0; 1413 bzero(&satmp, sizeof(satmp)); 1414 satmp.sa_len = sa_len_out; 1415 satmp.sa_family = AF_LOCAL; 1416 error = copyout(&satmp, uap->asa, sa_len_out); 1417 } 1418 } 1419 if (error == 0 && sa_len_out != sa_len_in) 1420 error = copyout(&sa_len_out, uap->alen, sizeof(*uap->alen)); 1421 if (sa) 1422 kfree(sa, M_SONAME); 1423 return (error); 1424 } 1425 1426 /* 1427 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1428 * This allows kern_getpeername() to return a pointer to an allocated struct 1429 * sockaddr which must be freed later with FREE(). The caller must 1430 * initialize *name to NULL. 1431 */ 1432 int 1433 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1434 { 1435 struct thread *td = curthread; 1436 struct file *fp; 1437 struct socket *so; 1438 struct sockaddr *sa = NULL; 1439 int error; 1440 1441 error = holdsock(td, s, &fp); 1442 if (error) 1443 return (error); 1444 if (*namelen < 0) { 1445 fdrop(fp); 1446 return (EINVAL); 1447 } 1448 so = (struct socket *)fp->f_data; 1449 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1450 fdrop(fp); 1451 return (ENOTCONN); 1452 } 1453 error = so_pru_peeraddr(so, &sa); 1454 if (error == 0) { 1455 if (sa == NULL) { 1456 *namelen = 0; 1457 } else { 1458 *namelen = MIN(*namelen, sa->sa_len); 1459 *name = sa; 1460 } 1461 } 1462 dropfp(td, s, fp); 1463 1464 return (error); 1465 } 1466 1467 /* 1468 * getpeername_args(int fdes, caddr_t asa, int *alen) 1469 * 1470 * Get name of peer for connected socket. 1471 * 1472 * MPALMOSTSAFE 1473 */ 1474 int 1475 sys_getpeername(struct getpeername_args *uap) 1476 { 1477 struct sockaddr *sa = NULL; 1478 int error, sa_len; 1479 1480 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1481 if (error) 1482 return (error); 1483 1484 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1485 1486 if (error == 0) { 1487 prison_local_ip(curthread, sa); 1488 error = copyout(sa, uap->asa, sa_len); 1489 } 1490 if (error == 0) 1491 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1492 if (sa) 1493 kfree(sa, M_SONAME); 1494 return (error); 1495 } 1496 1497 int 1498 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1499 { 1500 struct sockaddr *sa; 1501 int error; 1502 1503 *namp = NULL; 1504 if (len > SOCK_MAXADDRLEN) 1505 return ENAMETOOLONG; 1506 if (len < offsetof(struct sockaddr, sa_data[0])) 1507 return EDOM; 1508 sa = kmalloc(len, M_SONAME, M_WAITOK); 1509 error = copyin(uaddr, sa, len); 1510 if (error) { 1511 kfree(sa, M_SONAME); 1512 } else { 1513 sa->sa_len = len; 1514 *namp = sa; 1515 } 1516 return error; 1517 } 1518 1519 /* 1520 * Detach a mapped page and release resources back to the system. 1521 * We must release our wiring and if the object is ripped out 1522 * from under the vm_page we become responsible for freeing the 1523 * page. 1524 * 1525 * MPSAFE 1526 */ 1527 static void 1528 sf_buf_mfree(void *arg) 1529 { 1530 struct sf_buf *sf = arg; 1531 vm_page_t m; 1532 1533 m = sf_buf_page(sf); 1534 if (sf_buf_free(sf)) { 1535 /* sf invalid now */ 1536 vm_page_sbusy_drop(m); 1537 #if 0 1538 if (m->object == NULL && 1539 m->wire_count == 0 && 1540 (m->flags & PG_NEED_COMMIT) == 0) { 1541 vm_page_free(m); 1542 } else { 1543 vm_page_wakeup(m); 1544 } 1545 #endif 1546 } 1547 } 1548 1549 /* 1550 * sendfile(2). 1551 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1552 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1553 * 1554 * Send a file specified by 'fd' and starting at 'offset' to a socket 1555 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1556 * nbytes == 0. Optionally add a header and/or trailer to the socket 1557 * output. If specified, write the total number of bytes sent into *sbytes. 1558 * 1559 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1560 * the headers to count against the remaining bytes to be sent from 1561 * the file descriptor. We may wish to implement a compatibility syscall 1562 * in the future. 1563 * 1564 * MPALMOSTSAFE 1565 */ 1566 int 1567 sys_sendfile(struct sendfile_args *uap) 1568 { 1569 struct thread *td = curthread; 1570 struct file *fp; 1571 struct vnode *vp = NULL; 1572 struct sf_hdtr hdtr; 1573 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1574 struct uio auio; 1575 struct mbuf *mheader = NULL; 1576 size_t hbytes = 0; 1577 size_t tbytes; 1578 off_t hdtr_size = 0; 1579 off_t sbytes; 1580 int error; 1581 1582 /* 1583 * Do argument checking. Must be a regular file in, stream 1584 * type and connected socket out, positive offset. 1585 */ 1586 fp = holdfp(td, uap->fd, FREAD); 1587 if (fp == NULL) { 1588 return (EBADF); 1589 } 1590 if (fp->f_type != DTYPE_VNODE) { 1591 fdrop(fp); 1592 return (EINVAL); 1593 } 1594 vp = (struct vnode *)fp->f_data; 1595 vref(vp); 1596 dropfp(td, uap->fd, fp); 1597 1598 /* 1599 * If specified, get the pointer to the sf_hdtr struct for 1600 * any headers/trailers. 1601 */ 1602 if (uap->hdtr) { 1603 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1604 if (error) 1605 goto done; 1606 /* 1607 * Send any headers. 1608 */ 1609 if (hdtr.headers) { 1610 error = iovec_copyin(hdtr.headers, &iov, aiov, 1611 hdtr.hdr_cnt, &hbytes); 1612 if (error) 1613 goto done; 1614 auio.uio_iov = iov; 1615 auio.uio_iovcnt = hdtr.hdr_cnt; 1616 auio.uio_offset = 0; 1617 auio.uio_segflg = UIO_USERSPACE; 1618 auio.uio_rw = UIO_WRITE; 1619 auio.uio_td = td; 1620 auio.uio_resid = hbytes; 1621 1622 mheader = m_uiomove(&auio); 1623 1624 iovec_free(&iov, aiov); 1625 if (mheader == NULL) 1626 goto done; 1627 } 1628 } 1629 1630 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1631 &sbytes, uap->flags); 1632 if (error) 1633 goto done; 1634 1635 /* 1636 * Send trailers. Wimp out and use writev(2). 1637 */ 1638 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1639 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1640 hdtr.trl_cnt, &auio.uio_resid); 1641 if (error) 1642 goto done; 1643 auio.uio_iov = iov; 1644 auio.uio_iovcnt = hdtr.trl_cnt; 1645 auio.uio_offset = 0; 1646 auio.uio_segflg = UIO_USERSPACE; 1647 auio.uio_rw = UIO_WRITE; 1648 auio.uio_td = td; 1649 1650 tbytes = 0; /* avoid gcc warnings */ 1651 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1652 1653 iovec_free(&iov, aiov); 1654 if (error) 1655 goto done; 1656 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1657 } 1658 1659 done: 1660 if (vp) 1661 vrele(vp); 1662 if (uap->sbytes != NULL) { 1663 sbytes += hdtr_size; 1664 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1665 } 1666 return (error); 1667 } 1668 1669 int 1670 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1671 struct mbuf *mheader, off_t *sbytes, int flags) 1672 { 1673 struct thread *td = curthread; 1674 struct vm_object *obj; 1675 struct socket *so; 1676 struct file *fp; 1677 struct mbuf *m, *mp; 1678 struct sf_buf *sf; 1679 struct vm_page *pg; 1680 off_t off, xfsize, xbytes; 1681 off_t hbytes = 0; 1682 int error = 0; 1683 1684 if (vp->v_type != VREG) { 1685 error = EINVAL; 1686 goto done0; 1687 } 1688 if ((obj = vp->v_object) == NULL) { 1689 error = EINVAL; 1690 goto done0; 1691 } 1692 error = holdsock(td, sfd, &fp); 1693 if (error) 1694 goto done0; 1695 so = (struct socket *)fp->f_data; 1696 if (so->so_type != SOCK_STREAM) { 1697 error = EINVAL; 1698 goto done1; 1699 } 1700 if ((so->so_state & SS_ISCONNECTED) == 0) { 1701 error = ENOTCONN; 1702 goto done1; 1703 } 1704 if (offset < 0) { 1705 error = EINVAL; 1706 goto done1; 1707 } 1708 1709 /* 1710 * preallocation is required for asynchronous passing of mbufs, 1711 * otherwise we can wind up building up an infinite number of 1712 * mbufs during the asynchronous latency. 1713 */ 1714 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1715 error = EINVAL; 1716 goto done1; 1717 } 1718 1719 *sbytes = 0; 1720 xbytes = 0; 1721 1722 /* 1723 * Protect against multiple writers to the socket. 1724 * We need at least a shared lock on the VM object 1725 */ 1726 ssb_lock(&so->so_snd, M_WAITOK); 1727 vm_object_hold_shared(obj); 1728 1729 /* 1730 * Loop through the pages in the file, starting with the requested 1731 * offset. Get a file page (do I/O if necessary), map the file page 1732 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1733 * it on the socket. 1734 */ 1735 for (off = offset; ; 1736 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1737 vm_pindex_t pindex; 1738 vm_offset_t pgoff; 1739 long space; 1740 int loops; 1741 1742 pindex = OFF_TO_IDX(off); 1743 loops = 0; 1744 1745 retry_lookup: 1746 /* 1747 * Calculate the amount to transfer. Not to exceed a page, 1748 * the EOF, or the passed in nbytes. 1749 */ 1750 xfsize = vp->v_filesize - off; 1751 if (xfsize > PAGE_SIZE) 1752 xfsize = PAGE_SIZE; 1753 pgoff = (vm_offset_t)(off & PAGE_MASK); 1754 if (PAGE_SIZE - pgoff < xfsize) 1755 xfsize = PAGE_SIZE - pgoff; 1756 if (nbytes && xfsize > (nbytes - xbytes)) 1757 xfsize = nbytes - xbytes; 1758 if (xfsize <= 0) 1759 break; 1760 /* 1761 * Optimize the non-blocking case by looking at the socket space 1762 * before going to the extra work of constituting the sf_buf. 1763 */ 1764 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1765 space = ssb_space_prealloc(&so->so_snd); 1766 else 1767 space = ssb_space(&so->so_snd); 1768 1769 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1770 if (so->so_state & SS_CANTSENDMORE) 1771 error = EPIPE; 1772 else 1773 error = EAGAIN; 1774 goto done; 1775 } 1776 1777 /* 1778 * Attempt to look up the page. 1779 * 1780 * Try to find the data using a shared vm_object token and 1781 * vm_page_lookup_sbusy_try() first. 1782 * 1783 * If data is missing, use a UIO_NOCOPY VOP_READ to load 1784 * the missing data and loop back up. We avoid all sorts 1785 * of problems by not trying to hold onto the page during 1786 * the I/O. 1787 * 1788 * NOTE: The soft-busy will temporary block filesystem 1789 * truncation operations when a file is removed 1790 * while the sendfile is running. 1791 */ 1792 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize); 1793 if (pg == NULL) { 1794 struct uio auio; 1795 struct iovec aiov; 1796 int bsize; 1797 1798 if (++loops > 100000) { 1799 kprintf("sendfile: VOP operation failed " 1800 "to retain page\n"); 1801 error = EIO; 1802 goto done; 1803 } 1804 1805 vm_object_drop(obj); 1806 bsize = vp->v_mount->mnt_stat.f_iosize; 1807 auio.uio_iov = &aiov; 1808 auio.uio_iovcnt = 1; 1809 aiov.iov_base = 0; 1810 aiov.iov_len = MAXBSIZE; 1811 auio.uio_resid = MAXBSIZE; 1812 auio.uio_offset = trunc_page(off); 1813 auio.uio_segflg = UIO_NOCOPY; 1814 auio.uio_rw = UIO_READ; 1815 auio.uio_td = td; 1816 1817 vn_lock(vp, LK_SHARED | LK_RETRY); 1818 error = VOP_READ_FP(vp, &auio, 1819 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1820 td->td_ucred, fp); 1821 vn_unlock(vp); 1822 vm_object_hold_shared(obj); 1823 1824 if (error) 1825 goto done; 1826 goto retry_lookup; 1827 } 1828 1829 /* 1830 * Get a sendfile buf. We usually wait as long as necessary, 1831 * but this wait can be interrupted. 1832 */ 1833 if ((sf = sf_buf_alloc(pg)) == NULL) { 1834 vm_page_sbusy_drop(pg); 1835 /* vm_page_try_to_free(pg); */ 1836 error = EINTR; 1837 goto done; 1838 } 1839 1840 /* 1841 * Get an mbuf header and set it up as having external storage. 1842 */ 1843 MGETHDR(m, M_WAITOK, MT_DATA); 1844 if (m == NULL) { 1845 error = ENOBUFS; 1846 vm_page_sbusy_drop(pg); 1847 /* vm_page_try_to_free(pg); */ 1848 sf_buf_free(sf); 1849 goto done; 1850 } 1851 1852 m->m_ext.ext_free = sf_buf_mfree; 1853 m->m_ext.ext_ref = sf_buf_ref; 1854 m->m_ext.ext_arg = sf; 1855 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1856 m->m_ext.ext_size = PAGE_SIZE; 1857 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1858 m->m_flags |= M_EXT; 1859 m->m_pkthdr.len = m->m_len = xfsize; 1860 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1861 1862 if (mheader != NULL) { 1863 hbytes = mheader->m_pkthdr.len; 1864 mheader->m_pkthdr.len += m->m_pkthdr.len; 1865 m_cat(mheader, m); 1866 m = mheader; 1867 mheader = NULL; 1868 } else { 1869 hbytes = 0; 1870 } 1871 1872 /* 1873 * Add the buffer to the socket buffer chain. 1874 */ 1875 crit_enter(); 1876 retry_space: 1877 /* 1878 * Make sure that the socket is still able to take more data. 1879 * CANTSENDMORE being true usually means that the connection 1880 * was closed. so_error is true when an error was sensed after 1881 * a previous send. 1882 * The state is checked after the page mapping and buffer 1883 * allocation above since those operations may block and make 1884 * any socket checks stale. From this point forward, nothing 1885 * blocks before the pru_send (or more accurately, any blocking 1886 * results in a loop back to here to re-check). 1887 */ 1888 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1889 if (so->so_state & SS_CANTSENDMORE) { 1890 error = EPIPE; 1891 } else { 1892 error = so->so_error; 1893 so->so_error = 0; 1894 } 1895 m_freem(m); 1896 crit_exit(); 1897 goto done; 1898 } 1899 /* 1900 * Wait for socket space to become available. We do this just 1901 * after checking the connection state above in order to avoid 1902 * a race condition with ssb_wait(). 1903 */ 1904 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1905 space = ssb_space_prealloc(&so->so_snd); 1906 else 1907 space = ssb_space(&so->so_snd); 1908 1909 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1910 if (fp->f_flag & FNONBLOCK) { 1911 m_freem(m); 1912 crit_exit(); 1913 error = EAGAIN; 1914 goto done; 1915 } 1916 error = ssb_wait(&so->so_snd); 1917 /* 1918 * An error from ssb_wait usually indicates that we've 1919 * been interrupted by a signal. If we've sent anything 1920 * then return bytes sent, otherwise return the error. 1921 */ 1922 if (error) { 1923 m_freem(m); 1924 crit_exit(); 1925 goto done; 1926 } 1927 goto retry_space; 1928 } 1929 1930 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1931 for (mp = m; mp != NULL; mp = mp->m_next) 1932 ssb_preallocstream(&so->so_snd, mp); 1933 } 1934 if (use_sendfile_async) 1935 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1936 else 1937 error = so_pru_send(so, 0, m, NULL, NULL, td); 1938 1939 crit_exit(); 1940 if (error) 1941 goto done; 1942 } 1943 if (mheader != NULL) { 1944 *sbytes += mheader->m_pkthdr.len; 1945 1946 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1947 for (mp = mheader; mp != NULL; mp = mp->m_next) 1948 ssb_preallocstream(&so->so_snd, mp); 1949 } 1950 if (use_sendfile_async) 1951 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1952 else 1953 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1954 1955 mheader = NULL; 1956 } 1957 done: 1958 vm_object_drop(obj); 1959 ssb_unlock(&so->so_snd); 1960 done1: 1961 dropfp(td, sfd, fp); 1962 done0: 1963 if (mheader != NULL) 1964 m_freem(mheader); 1965 return (error); 1966 } 1967