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/sysmsg.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 sysmsg *sysmsg, const struct socket_args *uap) 140 { 141 int error; 142 143 error = kern_socket(uap->domain, uap->type, uap->protocol, 144 &sysmsg->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 sysmsg *sysmsg, const 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 sysmsg *sysmsg, const 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 sysmsg *sysmsg, const 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 &sysmsg->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 &sysmsg->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 sysmsg *sysmsg, const 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 &sysmsg->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 &sysmsg->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 sysmsg *sysmsg, const 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 &sysmsg->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 &sysmsg->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 sysmsg *sysmsg, const 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 sysmsg *sysmsg, const 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 struct ucred *cred = curthread->td_ucred; 679 int fd1, fd2, error; 680 u_int fflags = 0; 681 int oflags = 0; 682 683 if (type & SOCK_NONBLOCK) { 684 type &= ~SOCK_NONBLOCK; 685 fflags |= FNONBLOCK; 686 } 687 if (type & SOCK_CLOEXEC) { 688 type &= ~SOCK_CLOEXEC; 689 oflags |= O_CLOEXEC; 690 } 691 692 fdp = td->td_proc->p_fd; 693 error = socreate(domain, &so1, type, protocol, td); 694 if (error) 695 return (error); 696 error = socreate(domain, &so2, type, protocol, td); 697 if (error) 698 goto free1; 699 error = falloc(td->td_lwp, &fp1, &fd1); 700 if (error) 701 goto free2; 702 sv[0] = fd1; 703 fp1->f_data = so1; 704 error = falloc(td->td_lwp, &fp2, &fd2); 705 if (error) 706 goto free3; 707 fp2->f_data = so2; 708 sv[1] = fd2; 709 error = soconnect2(so1, so2, cred); 710 if (error) 711 goto free4; 712 if (type == SOCK_DGRAM) { 713 /* 714 * Datagram socket connection is asymmetric. 715 */ 716 error = soconnect2(so2, so1, cred); 717 if (error) 718 goto free4; 719 } 720 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 721 fp1->f_flag = fp2->f_flag = FREAD|FWRITE|fflags; 722 fp1->f_ops = fp2->f_ops = &socketops; 723 if (oflags & O_CLOEXEC) { 724 fdp->fd_files[fd1].fileflags |= UF_EXCLOSE; 725 fdp->fd_files[fd2].fileflags |= UF_EXCLOSE; 726 } 727 fsetfd(fdp, fp1, fd1); 728 fsetfd(fdp, fp2, fd2); 729 fdrop(fp1); 730 fdrop(fp2); 731 return (error); 732 free4: 733 fsetfd(fdp, NULL, fd2); 734 fdrop(fp2); 735 free3: 736 fsetfd(fdp, NULL, fd1); 737 fdrop(fp1); 738 free2: 739 (void)soclose(so2, 0); 740 free1: 741 (void)soclose(so1, 0); 742 return (error); 743 } 744 745 /* 746 * socketpair(int domain, int type, int protocol, int *rsv) 747 */ 748 int 749 sys_socketpair(struct sysmsg *sysmsg, const struct socketpair_args *uap) 750 { 751 int error, sockv[2]; 752 753 error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); 754 755 if (error == 0) { 756 error = copyout(sockv, uap->rsv, sizeof(sockv)); 757 758 if (error != 0) { 759 kern_close(sockv[0]); 760 kern_close(sockv[1]); 761 } 762 } 763 764 return (error); 765 } 766 767 int 768 kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, 769 struct mbuf *control, int flags, size_t *res) 770 { 771 struct thread *td = curthread; 772 struct lwp *lp = td->td_lwp; 773 struct proc *p = td->td_proc; 774 struct file *fp; 775 size_t len; 776 int error; 777 struct socket *so; 778 #ifdef KTRACE 779 struct iovec *ktriov = NULL; 780 struct uio ktruio; 781 #endif 782 783 error = holdsock(td, s, &fp); 784 if (error) 785 return (error); 786 #ifdef KTRACE 787 if (KTRPOINT(td, KTR_GENIO)) { 788 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 789 790 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 791 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 792 ktruio = *auio; 793 } 794 #endif 795 len = auio->uio_resid; 796 so = (struct socket *)fp->f_data; 797 if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 798 if (fp->f_flag & FNONBLOCK) 799 flags |= MSG_FNONBLOCKING; 800 } 801 error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); 802 if (error) { 803 if (auio->uio_resid != len && (error == ERESTART || 804 error == EINTR || error == EWOULDBLOCK)) 805 error = 0; 806 if (error == EPIPE && !(flags & MSG_NOSIGNAL) && 807 !(so->so_options & SO_NOSIGPIPE)) 808 lwpsignal(p, lp, SIGPIPE); 809 } 810 #ifdef KTRACE 811 if (ktriov != NULL) { 812 if (error == 0) { 813 ktruio.uio_iov = ktriov; 814 ktruio.uio_resid = len - auio->uio_resid; 815 ktrgenio(lp, s, UIO_WRITE, &ktruio, error); 816 } 817 kfree(ktriov, M_TEMP); 818 } 819 #endif 820 if (error == 0) 821 *res = len - auio->uio_resid; 822 dropfp(td, s, fp); 823 824 return (error); 825 } 826 827 /* 828 * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen) 829 * 830 * MPALMOSTSAFE 831 */ 832 int 833 sys_sendto(struct sysmsg *sysmsg, const struct sendto_args *uap) 834 { 835 struct thread *td = curthread; 836 struct uio auio; 837 struct iovec aiov; 838 struct sockaddr *sa = NULL; 839 int error; 840 841 if (uap->to) { 842 error = getsockaddr(&sa, uap->to, uap->tolen); 843 if (error) 844 return (error); 845 if (!prison_remote_ip(curthread, sa)) { 846 kfree(sa, M_SONAME); 847 return EAFNOSUPPORT; 848 } 849 } 850 aiov.iov_base = uap->buf; 851 aiov.iov_len = uap->len; 852 auio.uio_iov = &aiov; 853 auio.uio_iovcnt = 1; 854 auio.uio_offset = 0; 855 auio.uio_resid = uap->len; 856 auio.uio_segflg = UIO_USERSPACE; 857 auio.uio_rw = UIO_WRITE; 858 auio.uio_td = td; 859 860 error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags, 861 &sysmsg->sysmsg_szresult); 862 863 if (sa) 864 kfree(sa, M_SONAME); 865 return (error); 866 } 867 868 /* 869 * sendmsg_args(int s, caddr_t msg, int flags) 870 * 871 * MPALMOSTSAFE 872 */ 873 int 874 sys_sendmsg(struct sysmsg *sysmsg, const struct sendmsg_args *uap) 875 { 876 struct thread *td = curthread; 877 struct msghdr msg; 878 struct uio auio; 879 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 880 struct sockaddr *sa = NULL; 881 struct mbuf *control = NULL; 882 int error; 883 884 error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg)); 885 if (error) 886 return (error); 887 888 /* 889 * Conditionally copyin msg.msg_name. 890 */ 891 if (msg.msg_name) { 892 error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen); 893 if (error) 894 return (error); 895 if (!prison_remote_ip(curthread, sa)) { 896 kfree(sa, M_SONAME); 897 return EAFNOSUPPORT; 898 } 899 } 900 901 /* 902 * Populate auio. 903 */ 904 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 905 &auio.uio_resid); 906 if (error) 907 goto cleanup2; 908 auio.uio_iov = iov; 909 auio.uio_iovcnt = msg.msg_iovlen; 910 auio.uio_offset = 0; 911 auio.uio_segflg = UIO_USERSPACE; 912 auio.uio_rw = UIO_WRITE; 913 auio.uio_td = td; 914 915 /* 916 * Conditionally copyin msg.msg_control. 917 */ 918 if (msg.msg_control) { 919 if (msg.msg_controllen < sizeof(struct cmsghdr) || 920 msg.msg_controllen > MLEN) { 921 error = EINVAL; 922 goto cleanup; 923 } 924 control = m_get(M_WAITOK, MT_CONTROL); 925 control->m_len = msg.msg_controllen; 926 error = copyin(msg.msg_control, mtod(control, caddr_t), 927 msg.msg_controllen); 928 if (error) { 929 m_free(control); 930 goto cleanup; 931 } 932 } 933 934 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, 935 &sysmsg->sysmsg_szresult); 936 937 cleanup: 938 iovec_free(&iov, aiov); 939 cleanup2: 940 if (sa) 941 kfree(sa, M_SONAME); 942 return (error); 943 } 944 945 /* 946 * kern_recvmsg() takes a handle to sa and control. If the handle is non- 947 * null, it returns a dynamically allocated struct sockaddr and an mbuf. 948 * Don't forget to FREE() and m_free() these if they are returned. 949 */ 950 int 951 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, 952 struct mbuf **control, int *flags, size_t *res) 953 { 954 struct thread *td = curthread; 955 struct file *fp; 956 size_t len; 957 int error; 958 int lflags; 959 struct socket *so; 960 #ifdef KTRACE 961 struct iovec *ktriov = NULL; 962 struct uio ktruio; 963 #endif 964 965 error = holdsock(td, s, &fp); 966 if (error) 967 return (error); 968 #ifdef KTRACE 969 if (KTRPOINT(td, KTR_GENIO)) { 970 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 971 972 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 973 bcopy(auio->uio_iov, ktriov, iovlen); 974 ktruio = *auio; 975 } 976 #endif 977 len = auio->uio_resid; 978 so = (struct socket *)fp->f_data; 979 980 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 981 if (fp->f_flag & FNONBLOCK) { 982 if (flags) { 983 *flags |= MSG_FNONBLOCKING; 984 } else { 985 lflags = MSG_FNONBLOCKING; 986 flags = &lflags; 987 } 988 } 989 } 990 991 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 992 if (error) { 993 if (auio->uio_resid != len && (error == ERESTART || 994 error == EINTR || error == EWOULDBLOCK)) 995 error = 0; 996 } 997 #ifdef KTRACE 998 if (ktriov != NULL) { 999 if (error == 0) { 1000 ktruio.uio_iov = ktriov; 1001 ktruio.uio_resid = len - auio->uio_resid; 1002 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 1003 } 1004 kfree(ktriov, M_TEMP); 1005 } 1006 #endif 1007 if (error == 0) 1008 *res = len - auio->uio_resid; 1009 dropfp(td, s, fp); 1010 1011 return (error); 1012 } 1013 1014 /* 1015 * recvfrom_args(int s, caddr_t buf, size_t len, int flags, 1016 * caddr_t from, int *fromlenaddr) 1017 * 1018 * MPALMOSTSAFE 1019 */ 1020 int 1021 sys_recvfrom(struct sysmsg *sysmsg, const struct recvfrom_args *uap) 1022 { 1023 struct thread *td = curthread; 1024 struct uio auio; 1025 struct iovec aiov; 1026 struct sockaddr *sa = NULL; 1027 int error, fromlen; 1028 int flags; 1029 1030 if (uap->from && uap->fromlenaddr) { 1031 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); 1032 if (error) 1033 return (error); 1034 if (fromlen < 0) 1035 return (EINVAL); 1036 } else { 1037 fromlen = 0; 1038 } 1039 aiov.iov_base = uap->buf; 1040 aiov.iov_len = uap->len; 1041 auio.uio_iov = &aiov; 1042 auio.uio_iovcnt = 1; 1043 auio.uio_offset = 0; 1044 auio.uio_resid = uap->len; 1045 auio.uio_segflg = UIO_USERSPACE; 1046 auio.uio_rw = UIO_READ; 1047 auio.uio_td = td; 1048 flags = uap->flags; 1049 1050 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, 1051 &flags, &sysmsg->sysmsg_szresult); 1052 1053 if (error == 0 && uap->from) { 1054 /* note: sa may still be NULL */ 1055 if (sa) { 1056 fromlen = MIN(fromlen, sa->sa_len); 1057 prison_local_ip(curthread, sa); 1058 error = copyout(sa, uap->from, fromlen); 1059 } else { 1060 fromlen = 0; 1061 } 1062 if (error == 0) { 1063 error = copyout(&fromlen, uap->fromlenaddr, 1064 sizeof(fromlen)); 1065 } 1066 } 1067 if (sa) 1068 kfree(sa, M_SONAME); 1069 1070 return (error); 1071 } 1072 1073 /* 1074 * recvmsg_args(int s, struct msghdr *msg, int flags) 1075 * 1076 * MPALMOSTSAFE 1077 */ 1078 int 1079 sys_recvmsg(struct sysmsg *sysmsg, const struct recvmsg_args *uap) 1080 { 1081 struct thread *td = curthread; 1082 struct msghdr msg; 1083 struct uio auio; 1084 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1085 struct mbuf *m, *control = NULL; 1086 struct sockaddr *sa = NULL; 1087 caddr_t ctlbuf; 1088 socklen_t *ufromlenp, *ucontrollenp; 1089 int error, fromlen, controllen, len, flags, *uflagsp; 1090 1091 /* 1092 * This copyin handles everything except the iovec. 1093 */ 1094 error = copyin(uap->msg, &msg, sizeof(msg)); 1095 if (error) 1096 return (error); 1097 1098 if (msg.msg_name && msg.msg_namelen < 0) 1099 return (EINVAL); 1100 if (msg.msg_control && msg.msg_controllen < 0) 1101 return (EINVAL); 1102 1103 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1104 msg_namelen)); 1105 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1106 msg_controllen)); 1107 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, 1108 msg_flags)); 1109 1110 /* 1111 * Populate auio. 1112 */ 1113 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 1114 &auio.uio_resid); 1115 if (error) 1116 return (error); 1117 auio.uio_iov = iov; 1118 auio.uio_iovcnt = msg.msg_iovlen; 1119 auio.uio_offset = 0; 1120 auio.uio_segflg = UIO_USERSPACE; 1121 auio.uio_rw = UIO_READ; 1122 auio.uio_td = td; 1123 1124 flags = uap->flags; 1125 1126 error = kern_recvmsg(uap->s, 1127 (msg.msg_name ? &sa : NULL), &auio, 1128 (msg.msg_control ? &control : NULL), &flags, 1129 &sysmsg->sysmsg_szresult); 1130 1131 /* 1132 * Conditionally copyout the name and populate the namelen field. 1133 */ 1134 if (error == 0 && msg.msg_name) { 1135 /* note: sa may still be NULL */ 1136 if (sa != NULL) { 1137 fromlen = MIN(msg.msg_namelen, sa->sa_len); 1138 prison_local_ip(curthread, sa); 1139 error = copyout(sa, msg.msg_name, fromlen); 1140 } else { 1141 fromlen = 0; 1142 } 1143 if (error == 0) 1144 error = copyout(&fromlen, ufromlenp, 1145 sizeof(*ufromlenp)); 1146 } 1147 1148 /* 1149 * Copyout msg.msg_control and msg.msg_controllen. 1150 */ 1151 if (error == 0 && msg.msg_control) { 1152 len = msg.msg_controllen; 1153 m = control; 1154 ctlbuf = (caddr_t)msg.msg_control; 1155 1156 while(m && len > 0) { 1157 unsigned int tocopy; 1158 1159 if (len >= m->m_len) { 1160 tocopy = m->m_len; 1161 } else { 1162 msg.msg_flags |= MSG_CTRUNC; 1163 tocopy = len; 1164 } 1165 1166 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); 1167 if (error) 1168 goto cleanup; 1169 1170 ctlbuf += tocopy; 1171 len -= tocopy; 1172 m = m->m_next; 1173 } 1174 controllen = ctlbuf - (caddr_t)msg.msg_control; 1175 error = copyout(&controllen, ucontrollenp, 1176 sizeof(*ucontrollenp)); 1177 } 1178 1179 if (error == 0) 1180 error = copyout(&flags, uflagsp, sizeof(*uflagsp)); 1181 1182 cleanup: 1183 if (sa) 1184 kfree(sa, M_SONAME); 1185 iovec_free(&iov, aiov); 1186 if (control) 1187 m_freem(control); 1188 return (error); 1189 } 1190 1191 /* 1192 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1193 * in kernel pointer instead of a userland pointer. This allows us 1194 * to manipulate socket options in the emulation code. 1195 */ 1196 int 1197 kern_setsockopt(int s, struct sockopt *sopt) 1198 { 1199 struct thread *td = curthread; 1200 struct file *fp; 1201 int error; 1202 1203 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1204 return (EFAULT); 1205 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1206 return (EINVAL); 1207 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1208 return (EINVAL); 1209 1210 error = holdsock(td, s, &fp); 1211 if (error) 1212 return (error); 1213 1214 error = sosetopt((struct socket *)fp->f_data, sopt); 1215 dropfp(td, s, fp); 1216 1217 return (error); 1218 } 1219 1220 /* 1221 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) 1222 * 1223 * MPALMOSTSAFE 1224 */ 1225 int 1226 sys_setsockopt(struct sysmsg *sysmsg, const struct setsockopt_args *uap) 1227 { 1228 struct thread *td = curthread; 1229 struct sockopt sopt; 1230 int error; 1231 1232 sopt.sopt_level = uap->level; 1233 sopt.sopt_name = uap->name; 1234 sopt.sopt_valsize = uap->valsize; 1235 sopt.sopt_td = td; 1236 sopt.sopt_val = NULL; 1237 1238 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1239 return (EINVAL); 1240 if (uap->val) { 1241 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1242 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1243 if (error) 1244 goto out; 1245 } 1246 1247 error = kern_setsockopt(uap->s, &sopt); 1248 out: 1249 if (uap->val) 1250 kfree(sopt.sopt_val, M_TEMP); 1251 return(error); 1252 } 1253 1254 /* 1255 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1256 * in kernel pointer instead of a userland pointer. This allows us 1257 * to manipulate socket options in the emulation code. 1258 */ 1259 int 1260 kern_getsockopt(int s, struct sockopt *sopt) 1261 { 1262 struct thread *td = curthread; 1263 struct file *fp; 1264 int error; 1265 1266 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1267 return (EFAULT); 1268 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1269 return (EINVAL); 1270 1271 error = holdsock(td, s, &fp); 1272 if (error) 1273 return (error); 1274 1275 error = sogetopt((struct socket *)fp->f_data, sopt); 1276 dropfp(td, s, fp); 1277 1278 return (error); 1279 } 1280 1281 /* 1282 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) 1283 * 1284 * MPALMOSTSAFE 1285 */ 1286 int 1287 sys_getsockopt(struct sysmsg *sysmsg, const struct getsockopt_args *uap) 1288 { 1289 struct thread *td = curthread; 1290 struct sockopt sopt; 1291 int error, valsize, valszmax, mflag = 0; 1292 1293 if (uap->val) { 1294 error = copyin(uap->avalsize, &valsize, sizeof(valsize)); 1295 if (error) 1296 return (error); 1297 } else { 1298 valsize = 0; 1299 } 1300 1301 sopt.sopt_level = uap->level; 1302 sopt.sopt_name = uap->name; 1303 sopt.sopt_valsize = valsize; 1304 sopt.sopt_td = td; 1305 sopt.sopt_val = NULL; 1306 1307 if (td->td_proc->p_ucred->cr_uid == 0) { 1308 valszmax = SOMAXOPT_SIZE0; 1309 mflag = M_NULLOK; 1310 } else { 1311 valszmax = SOMAXOPT_SIZE; 1312 } 1313 if (sopt.sopt_valsize > valszmax) /* unsigned */ 1314 return (EINVAL); 1315 if (uap->val) { 1316 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, 1317 M_WAITOK | mflag); 1318 if (sopt.sopt_val == NULL) 1319 return (ENOBUFS); 1320 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1321 if (error) 1322 goto out; 1323 } 1324 1325 error = kern_getsockopt(uap->s, &sopt); 1326 if (error) 1327 goto out; 1328 valsize = sopt.sopt_valsize; 1329 error = copyout(&valsize, uap->avalsize, sizeof(valsize)); 1330 if (error) 1331 goto out; 1332 if (uap->val) 1333 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); 1334 out: 1335 if (uap->val) 1336 kfree(sopt.sopt_val, M_TEMP); 1337 return (error); 1338 } 1339 1340 /* 1341 * The second argument to kern_getsockname() is a handle to a struct sockaddr. 1342 * This allows kern_getsockname() to return a pointer to an allocated struct 1343 * sockaddr which must be freed later with FREE(). The caller must 1344 * initialize *name to NULL. 1345 */ 1346 int 1347 kern_getsockname(int s, struct sockaddr **name, int *namelen) 1348 { 1349 struct thread *td = curthread; 1350 struct file *fp; 1351 struct socket *so; 1352 struct sockaddr *sa = NULL; 1353 int error; 1354 1355 error = holdsock(td, s, &fp); 1356 if (error) 1357 return (error); 1358 if (*namelen < 0) { 1359 fdrop(fp); 1360 return (EINVAL); 1361 } 1362 so = (struct socket *)fp->f_data; 1363 error = so_pru_sockaddr(so, &sa); 1364 if (error == 0) { 1365 if (sa == NULL) { 1366 *namelen = 0; 1367 } else { 1368 *namelen = MIN(*namelen, sa->sa_len); 1369 *name = sa; 1370 } 1371 } 1372 dropfp(td, s, fp); 1373 1374 return (error); 1375 } 1376 1377 /* 1378 * getsockname_args(int fdes, caddr_t asa, int *alen) 1379 * 1380 * Get socket name. 1381 * 1382 * MPALMOSTSAFE 1383 */ 1384 int 1385 sys_getsockname(struct sysmsg *sysmsg, const struct getsockname_args *uap) 1386 { 1387 struct sockaddr *sa = NULL; 1388 struct sockaddr satmp; 1389 int error, sa_len_in, sa_len_out; 1390 1391 error = copyin(uap->alen, &sa_len_in, sizeof(sa_len_in)); 1392 if (error) 1393 return (error); 1394 1395 sa_len_out = sa_len_in; 1396 error = kern_getsockname(uap->fdes, &sa, &sa_len_out); 1397 1398 if (error == 0) { 1399 if (sa) { 1400 prison_local_ip(curthread, sa); 1401 error = copyout(sa, uap->asa, sa_len_out); 1402 } else { 1403 /* 1404 * unnamed uipc sockets don't bother storing 1405 * sockaddr, simulate an AF_LOCAL sockaddr. 1406 */ 1407 sa_len_out = sizeof(satmp); 1408 if (sa_len_out > sa_len_in) 1409 sa_len_out = sa_len_in; 1410 if (sa_len_out < 0) 1411 sa_len_out = 0; 1412 bzero(&satmp, sizeof(satmp)); 1413 satmp.sa_len = sa_len_out; 1414 satmp.sa_family = AF_LOCAL; 1415 error = copyout(&satmp, uap->asa, sa_len_out); 1416 } 1417 } 1418 if (error == 0 && sa_len_out != sa_len_in) 1419 error = copyout(&sa_len_out, uap->alen, sizeof(*uap->alen)); 1420 if (sa) 1421 kfree(sa, M_SONAME); 1422 return (error); 1423 } 1424 1425 /* 1426 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1427 * This allows kern_getpeername() to return a pointer to an allocated struct 1428 * sockaddr which must be freed later with FREE(). The caller must 1429 * initialize *name to NULL. 1430 */ 1431 int 1432 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1433 { 1434 struct thread *td = curthread; 1435 struct file *fp; 1436 struct socket *so; 1437 struct sockaddr *sa = NULL; 1438 int error; 1439 1440 error = holdsock(td, s, &fp); 1441 if (error) 1442 return (error); 1443 if (*namelen < 0) { 1444 fdrop(fp); 1445 return (EINVAL); 1446 } 1447 so = (struct socket *)fp->f_data; 1448 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1449 fdrop(fp); 1450 return (ENOTCONN); 1451 } 1452 error = so_pru_peeraddr(so, &sa); 1453 if (error == 0) { 1454 if (sa == NULL) { 1455 *namelen = 0; 1456 } else { 1457 *namelen = MIN(*namelen, sa->sa_len); 1458 *name = sa; 1459 } 1460 } 1461 dropfp(td, s, fp); 1462 1463 return (error); 1464 } 1465 1466 /* 1467 * getpeername_args(int fdes, caddr_t asa, int *alen) 1468 * 1469 * Get name of peer for connected socket. 1470 * 1471 * MPALMOSTSAFE 1472 */ 1473 int 1474 sys_getpeername(struct sysmsg *sysmsg, const struct getpeername_args *uap) 1475 { 1476 struct sockaddr *sa = NULL; 1477 int error, sa_len; 1478 1479 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1480 if (error) 1481 return (error); 1482 1483 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1484 1485 if (error == 0) { 1486 prison_local_ip(curthread, sa); 1487 error = copyout(sa, uap->asa, sa_len); 1488 } 1489 if (error == 0) 1490 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1491 if (sa) 1492 kfree(sa, M_SONAME); 1493 return (error); 1494 } 1495 1496 int 1497 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1498 { 1499 struct sockaddr *sa; 1500 int error; 1501 1502 *namp = NULL; 1503 if (len > SOCK_MAXADDRLEN) 1504 return ENAMETOOLONG; 1505 if (len < offsetof(struct sockaddr, sa_data[0])) 1506 return EDOM; 1507 sa = kmalloc(len, M_SONAME, M_WAITOK); 1508 error = copyin(uaddr, sa, len); 1509 if (error) { 1510 kfree(sa, M_SONAME); 1511 } else { 1512 sa->sa_len = len; 1513 *namp = sa; 1514 } 1515 return error; 1516 } 1517 1518 /* 1519 * Detach a mapped page and release resources back to the system. 1520 * We must release our wiring and if the object is ripped out 1521 * from under the vm_page we become responsible for freeing the 1522 * page. 1523 * 1524 * MPSAFE 1525 */ 1526 static void 1527 sf_buf_mfree(void *arg) 1528 { 1529 struct sf_buf *sf = arg; 1530 vm_page_t m; 1531 1532 m = sf_buf_page(sf); 1533 if (sf_buf_free(sf)) { 1534 /* sf invalid now */ 1535 vm_page_sbusy_drop(m); 1536 #if 0 1537 if (m->object == NULL && 1538 m->wire_count == 0 && 1539 (m->flags & PG_NEED_COMMIT) == 0) { 1540 vm_page_free(m); 1541 } else { 1542 vm_page_wakeup(m); 1543 } 1544 #endif 1545 } 1546 } 1547 1548 /* 1549 * sendfile(2). 1550 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1551 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1552 * 1553 * Send a file specified by 'fd' and starting at 'offset' to a socket 1554 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1555 * nbytes == 0. Optionally add a header and/or trailer to the socket 1556 * output. If specified, write the total number of bytes sent into *sbytes. 1557 * 1558 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1559 * the headers to count against the remaining bytes to be sent from 1560 * the file descriptor. We may wish to implement a compatibility syscall 1561 * in the future. 1562 * 1563 * MPALMOSTSAFE 1564 */ 1565 int 1566 sys_sendfile(struct sysmsg *sysmsg, const struct sendfile_args *uap) 1567 { 1568 struct thread *td = curthread; 1569 struct file *fp; 1570 struct vnode *vp = NULL; 1571 struct sf_hdtr hdtr; 1572 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1573 struct uio auio; 1574 struct mbuf *mheader = NULL; 1575 size_t hbytes = 0; 1576 size_t tbytes; 1577 off_t hdtr_size = 0; 1578 off_t sbytes; 1579 int error; 1580 1581 /* 1582 * Do argument checking. Must be a regular file in, stream 1583 * type and connected socket out, positive offset. 1584 */ 1585 fp = holdfp(td, uap->fd, FREAD); 1586 if (fp == NULL) { 1587 return (EBADF); 1588 } 1589 if (fp->f_type != DTYPE_VNODE) { 1590 fdrop(fp); 1591 return (EINVAL); 1592 } 1593 vp = (struct vnode *)fp->f_data; 1594 vref(vp); 1595 dropfp(td, uap->fd, fp); 1596 1597 /* 1598 * If specified, get the pointer to the sf_hdtr struct for 1599 * any headers/trailers. 1600 */ 1601 if (uap->hdtr) { 1602 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1603 if (error) 1604 goto done; 1605 /* 1606 * Send any headers. 1607 */ 1608 if (hdtr.headers) { 1609 error = iovec_copyin(hdtr.headers, &iov, aiov, 1610 hdtr.hdr_cnt, &hbytes); 1611 if (error) 1612 goto done; 1613 auio.uio_iov = iov; 1614 auio.uio_iovcnt = hdtr.hdr_cnt; 1615 auio.uio_offset = 0; 1616 auio.uio_segflg = UIO_USERSPACE; 1617 auio.uio_rw = UIO_WRITE; 1618 auio.uio_td = td; 1619 auio.uio_resid = hbytes; 1620 1621 mheader = m_uiomove(&auio); 1622 1623 iovec_free(&iov, aiov); 1624 if (mheader == NULL) 1625 goto done; 1626 } 1627 } 1628 1629 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1630 &sbytes, uap->flags); 1631 if (error) 1632 goto done; 1633 1634 /* 1635 * Send trailers. Wimp out and use writev(2). 1636 */ 1637 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1638 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1639 hdtr.trl_cnt, &auio.uio_resid); 1640 if (error) 1641 goto done; 1642 auio.uio_iov = iov; 1643 auio.uio_iovcnt = hdtr.trl_cnt; 1644 auio.uio_offset = 0; 1645 auio.uio_segflg = UIO_USERSPACE; 1646 auio.uio_rw = UIO_WRITE; 1647 auio.uio_td = td; 1648 1649 tbytes = 0; /* avoid gcc warnings */ 1650 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1651 1652 iovec_free(&iov, aiov); 1653 if (error) 1654 goto done; 1655 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1656 } 1657 1658 done: 1659 if (vp) 1660 vrele(vp); 1661 if (uap->sbytes != NULL) { 1662 sbytes += hdtr_size; 1663 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1664 } 1665 return (error); 1666 } 1667 1668 int 1669 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1670 struct mbuf *mheader, off_t *sbytes, int flags) 1671 { 1672 struct thread *td = curthread; 1673 struct vm_object *obj; 1674 struct socket *so; 1675 struct file *fp; 1676 struct mbuf *m, *mp; 1677 struct sf_buf *sf; 1678 struct vm_page *pg; 1679 off_t off, xfsize, xbytes; 1680 off_t hbytes = 0; 1681 int error = 0; 1682 1683 if (vp->v_type != VREG) { 1684 error = EINVAL; 1685 goto done0; 1686 } 1687 if ((obj = vp->v_object) == NULL) { 1688 error = EINVAL; 1689 goto done0; 1690 } 1691 error = holdsock(td, sfd, &fp); 1692 if (error) 1693 goto done0; 1694 so = (struct socket *)fp->f_data; 1695 if (so->so_type != SOCK_STREAM) { 1696 error = EINVAL; 1697 goto done1; 1698 } 1699 if ((so->so_state & SS_ISCONNECTED) == 0) { 1700 error = ENOTCONN; 1701 goto done1; 1702 } 1703 if (offset < 0) { 1704 error = EINVAL; 1705 goto done1; 1706 } 1707 1708 /* 1709 * preallocation is required for asynchronous passing of mbufs, 1710 * otherwise we can wind up building up an infinite number of 1711 * mbufs during the asynchronous latency. 1712 */ 1713 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1714 error = EINVAL; 1715 goto done1; 1716 } 1717 1718 *sbytes = 0; 1719 xbytes = 0; 1720 1721 /* 1722 * Protect against multiple writers to the socket. 1723 * We need at least a shared lock on the VM object 1724 */ 1725 ssb_lock(&so->so_snd, M_WAITOK); 1726 vm_object_hold_shared(obj); 1727 1728 /* 1729 * Loop through the pages in the file, starting with the requested 1730 * offset. Get a file page (do I/O if necessary), map the file page 1731 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1732 * it on the socket. 1733 */ 1734 for (off = offset; ; 1735 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1736 vm_pindex_t pindex; 1737 vm_offset_t pgoff; 1738 long space; 1739 int loops; 1740 1741 pindex = OFF_TO_IDX(off); 1742 loops = 0; 1743 1744 retry_lookup: 1745 /* 1746 * Calculate the amount to transfer. Not to exceed a page, 1747 * the EOF, or the passed in nbytes. 1748 */ 1749 xfsize = vp->v_filesize - off; 1750 if (xfsize > PAGE_SIZE) 1751 xfsize = PAGE_SIZE; 1752 pgoff = (vm_offset_t)(off & PAGE_MASK); 1753 if (PAGE_SIZE - pgoff < xfsize) 1754 xfsize = PAGE_SIZE - pgoff; 1755 if (nbytes && xfsize > (nbytes - xbytes)) 1756 xfsize = nbytes - xbytes; 1757 if (xfsize <= 0) 1758 break; 1759 /* 1760 * Optimize the non-blocking case by looking at the socket space 1761 * before going to the extra work of constituting the sf_buf. 1762 */ 1763 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1764 space = ssb_space_prealloc(&so->so_snd); 1765 else 1766 space = ssb_space(&so->so_snd); 1767 1768 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1769 if (so->so_state & SS_CANTSENDMORE) 1770 error = EPIPE; 1771 else 1772 error = EAGAIN; 1773 goto done; 1774 } 1775 1776 /* 1777 * Attempt to look up the page. 1778 * 1779 * Try to find the data using a shared vm_object token and 1780 * vm_page_lookup_sbusy_try() first. 1781 * 1782 * If data is missing, use a UIO_NOCOPY VOP_READ to load 1783 * the missing data and loop back up. We avoid all sorts 1784 * of problems by not trying to hold onto the page during 1785 * the I/O. 1786 * 1787 * NOTE: The soft-busy will temporary block filesystem 1788 * truncation operations when a file is removed 1789 * while the sendfile is running. 1790 */ 1791 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize); 1792 if (pg == NULL) { 1793 struct uio auio; 1794 struct iovec aiov; 1795 int bsize; 1796 1797 if (++loops > 100000) { 1798 kprintf("sendfile: VOP operation failed " 1799 "to retain page\n"); 1800 error = EIO; 1801 goto done; 1802 } 1803 1804 vm_object_drop(obj); 1805 bsize = vp->v_mount->mnt_stat.f_iosize; 1806 auio.uio_iov = &aiov; 1807 auio.uio_iovcnt = 1; 1808 aiov.iov_base = 0; 1809 aiov.iov_len = MAXBSIZE; 1810 auio.uio_resid = MAXBSIZE; 1811 auio.uio_offset = trunc_page(off); 1812 auio.uio_segflg = UIO_NOCOPY; 1813 auio.uio_rw = UIO_READ; 1814 auio.uio_td = td; 1815 1816 vn_lock(vp, LK_SHARED | LK_RETRY); 1817 error = VOP_READ_FP(vp, &auio, 1818 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1819 td->td_ucred, fp); 1820 vn_unlock(vp); 1821 vm_object_hold_shared(obj); 1822 1823 if (error) 1824 goto done; 1825 goto retry_lookup; 1826 } 1827 1828 /* 1829 * Get a sendfile buf. We usually wait as long as necessary, 1830 * but this wait can be interrupted. 1831 */ 1832 if ((sf = sf_buf_alloc(pg)) == NULL) { 1833 vm_page_sbusy_drop(pg); 1834 /* vm_page_try_to_free(pg); */ 1835 error = EINTR; 1836 goto done; 1837 } 1838 1839 /* 1840 * Get an mbuf header and set it up as having external storage. 1841 */ 1842 MGETHDR(m, M_WAITOK, MT_DATA); 1843 m->m_ext.ext_free = sf_buf_mfree; 1844 m->m_ext.ext_ref = sf_buf_ref; 1845 m->m_ext.ext_arg = sf; 1846 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1847 m->m_ext.ext_size = PAGE_SIZE; 1848 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1849 m->m_flags |= M_EXT; 1850 m->m_pkthdr.len = m->m_len = xfsize; 1851 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1852 1853 if (mheader != NULL) { 1854 hbytes = mheader->m_pkthdr.len; 1855 mheader->m_pkthdr.len += m->m_pkthdr.len; 1856 m_cat(mheader, m); 1857 m = mheader; 1858 mheader = NULL; 1859 } else { 1860 hbytes = 0; 1861 } 1862 1863 /* 1864 * Add the buffer to the socket buffer chain. 1865 */ 1866 crit_enter(); 1867 retry_space: 1868 /* 1869 * Make sure that the socket is still able to take more data. 1870 * CANTSENDMORE being true usually means that the connection 1871 * was closed. so_error is true when an error was sensed after 1872 * a previous send. 1873 * The state is checked after the page mapping and buffer 1874 * allocation above since those operations may block and make 1875 * any socket checks stale. From this point forward, nothing 1876 * blocks before the pru_send (or more accurately, any blocking 1877 * results in a loop back to here to re-check). 1878 */ 1879 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1880 if (so->so_state & SS_CANTSENDMORE) { 1881 error = EPIPE; 1882 } else { 1883 error = so->so_error; 1884 so->so_error = 0; 1885 } 1886 m_freem(m); 1887 crit_exit(); 1888 goto done; 1889 } 1890 /* 1891 * Wait for socket space to become available. We do this just 1892 * after checking the connection state above in order to avoid 1893 * a race condition with ssb_wait(). 1894 */ 1895 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1896 space = ssb_space_prealloc(&so->so_snd); 1897 else 1898 space = ssb_space(&so->so_snd); 1899 1900 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1901 if (fp->f_flag & FNONBLOCK) { 1902 m_freem(m); 1903 crit_exit(); 1904 error = EAGAIN; 1905 goto done; 1906 } 1907 error = ssb_wait(&so->so_snd); 1908 /* 1909 * An error from ssb_wait usually indicates that we've 1910 * been interrupted by a signal. If we've sent anything 1911 * then return bytes sent, otherwise return the error. 1912 */ 1913 if (error) { 1914 m_freem(m); 1915 crit_exit(); 1916 goto done; 1917 } 1918 goto retry_space; 1919 } 1920 1921 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1922 for (mp = m; mp != NULL; mp = mp->m_next) 1923 ssb_preallocstream(&so->so_snd, mp); 1924 } 1925 if (use_sendfile_async) 1926 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1927 else 1928 error = so_pru_send(so, 0, m, NULL, NULL, td); 1929 1930 crit_exit(); 1931 if (error) 1932 goto done; 1933 } 1934 if (mheader != NULL) { 1935 *sbytes += mheader->m_pkthdr.len; 1936 1937 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1938 for (mp = mheader; mp != NULL; mp = mp->m_next) 1939 ssb_preallocstream(&so->so_snd, mp); 1940 } 1941 if (use_sendfile_async) 1942 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1943 else 1944 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1945 1946 mheader = NULL; 1947 } 1948 done: 1949 vm_object_drop(obj); 1950 ssb_unlock(&so->so_snd); 1951 done1: 1952 dropfp(td, sfd, fp); 1953 done0: 1954 if (mheader != NULL) 1955 m_freem(mheader); 1956 return (error); 1957 } 1958