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 if (control == NULL) { 926 error = ENOBUFS; 927 goto cleanup; 928 } 929 control->m_len = msg.msg_controllen; 930 error = copyin(msg.msg_control, mtod(control, caddr_t), 931 msg.msg_controllen); 932 if (error) { 933 m_free(control); 934 goto cleanup; 935 } 936 } 937 938 error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, 939 &sysmsg->sysmsg_szresult); 940 941 cleanup: 942 iovec_free(&iov, aiov); 943 cleanup2: 944 if (sa) 945 kfree(sa, M_SONAME); 946 return (error); 947 } 948 949 /* 950 * kern_recvmsg() takes a handle to sa and control. If the handle is non- 951 * null, it returns a dynamically allocated struct sockaddr and an mbuf. 952 * Don't forget to FREE() and m_free() these if they are returned. 953 */ 954 int 955 kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, 956 struct mbuf **control, int *flags, size_t *res) 957 { 958 struct thread *td = curthread; 959 struct file *fp; 960 size_t len; 961 int error; 962 int lflags; 963 struct socket *so; 964 #ifdef KTRACE 965 struct iovec *ktriov = NULL; 966 struct uio ktruio; 967 #endif 968 969 error = holdsock(td, s, &fp); 970 if (error) 971 return (error); 972 #ifdef KTRACE 973 if (KTRPOINT(td, KTR_GENIO)) { 974 int iovlen = auio->uio_iovcnt * sizeof (struct iovec); 975 976 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK); 977 bcopy(auio->uio_iov, ktriov, iovlen); 978 ktruio = *auio; 979 } 980 #endif 981 len = auio->uio_resid; 982 so = (struct socket *)fp->f_data; 983 984 if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { 985 if (fp->f_flag & FNONBLOCK) { 986 if (flags) { 987 *flags |= MSG_FNONBLOCKING; 988 } else { 989 lflags = MSG_FNONBLOCKING; 990 flags = &lflags; 991 } 992 } 993 } 994 995 error = so_pru_soreceive(so, sa, auio, NULL, control, flags); 996 if (error) { 997 if (auio->uio_resid != len && (error == ERESTART || 998 error == EINTR || error == EWOULDBLOCK)) 999 error = 0; 1000 } 1001 #ifdef KTRACE 1002 if (ktriov != NULL) { 1003 if (error == 0) { 1004 ktruio.uio_iov = ktriov; 1005 ktruio.uio_resid = len - auio->uio_resid; 1006 ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); 1007 } 1008 kfree(ktriov, M_TEMP); 1009 } 1010 #endif 1011 if (error == 0) 1012 *res = len - auio->uio_resid; 1013 dropfp(td, s, fp); 1014 1015 return (error); 1016 } 1017 1018 /* 1019 * recvfrom_args(int s, caddr_t buf, size_t len, int flags, 1020 * caddr_t from, int *fromlenaddr) 1021 * 1022 * MPALMOSTSAFE 1023 */ 1024 int 1025 sys_recvfrom(struct sysmsg *sysmsg, const struct recvfrom_args *uap) 1026 { 1027 struct thread *td = curthread; 1028 struct uio auio; 1029 struct iovec aiov; 1030 struct sockaddr *sa = NULL; 1031 int error, fromlen; 1032 int flags; 1033 1034 if (uap->from && uap->fromlenaddr) { 1035 error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); 1036 if (error) 1037 return (error); 1038 if (fromlen < 0) 1039 return (EINVAL); 1040 } else { 1041 fromlen = 0; 1042 } 1043 aiov.iov_base = uap->buf; 1044 aiov.iov_len = uap->len; 1045 auio.uio_iov = &aiov; 1046 auio.uio_iovcnt = 1; 1047 auio.uio_offset = 0; 1048 auio.uio_resid = uap->len; 1049 auio.uio_segflg = UIO_USERSPACE; 1050 auio.uio_rw = UIO_READ; 1051 auio.uio_td = td; 1052 flags = uap->flags; 1053 1054 error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, 1055 &flags, &sysmsg->sysmsg_szresult); 1056 1057 if (error == 0 && uap->from) { 1058 /* note: sa may still be NULL */ 1059 if (sa) { 1060 fromlen = MIN(fromlen, sa->sa_len); 1061 prison_local_ip(curthread, sa); 1062 error = copyout(sa, uap->from, fromlen); 1063 } else { 1064 fromlen = 0; 1065 } 1066 if (error == 0) { 1067 error = copyout(&fromlen, uap->fromlenaddr, 1068 sizeof(fromlen)); 1069 } 1070 } 1071 if (sa) 1072 kfree(sa, M_SONAME); 1073 1074 return (error); 1075 } 1076 1077 /* 1078 * recvmsg_args(int s, struct msghdr *msg, int flags) 1079 * 1080 * MPALMOSTSAFE 1081 */ 1082 int 1083 sys_recvmsg(struct sysmsg *sysmsg, const struct recvmsg_args *uap) 1084 { 1085 struct thread *td = curthread; 1086 struct msghdr msg; 1087 struct uio auio; 1088 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1089 struct mbuf *m, *control = NULL; 1090 struct sockaddr *sa = NULL; 1091 caddr_t ctlbuf; 1092 socklen_t *ufromlenp, *ucontrollenp; 1093 int error, fromlen, controllen, len, flags, *uflagsp; 1094 1095 /* 1096 * This copyin handles everything except the iovec. 1097 */ 1098 error = copyin(uap->msg, &msg, sizeof(msg)); 1099 if (error) 1100 return (error); 1101 1102 if (msg.msg_name && msg.msg_namelen < 0) 1103 return (EINVAL); 1104 if (msg.msg_control && msg.msg_controllen < 0) 1105 return (EINVAL); 1106 1107 ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1108 msg_namelen)); 1109 ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, 1110 msg_controllen)); 1111 uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, 1112 msg_flags)); 1113 1114 /* 1115 * Populate auio. 1116 */ 1117 error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, 1118 &auio.uio_resid); 1119 if (error) 1120 return (error); 1121 auio.uio_iov = iov; 1122 auio.uio_iovcnt = msg.msg_iovlen; 1123 auio.uio_offset = 0; 1124 auio.uio_segflg = UIO_USERSPACE; 1125 auio.uio_rw = UIO_READ; 1126 auio.uio_td = td; 1127 1128 flags = uap->flags; 1129 1130 error = kern_recvmsg(uap->s, 1131 (msg.msg_name ? &sa : NULL), &auio, 1132 (msg.msg_control ? &control : NULL), &flags, 1133 &sysmsg->sysmsg_szresult); 1134 1135 /* 1136 * Conditionally copyout the name and populate the namelen field. 1137 */ 1138 if (error == 0 && msg.msg_name) { 1139 /* note: sa may still be NULL */ 1140 if (sa != NULL) { 1141 fromlen = MIN(msg.msg_namelen, sa->sa_len); 1142 prison_local_ip(curthread, sa); 1143 error = copyout(sa, msg.msg_name, fromlen); 1144 } else { 1145 fromlen = 0; 1146 } 1147 if (error == 0) 1148 error = copyout(&fromlen, ufromlenp, 1149 sizeof(*ufromlenp)); 1150 } 1151 1152 /* 1153 * Copyout msg.msg_control and msg.msg_controllen. 1154 */ 1155 if (error == 0 && msg.msg_control) { 1156 len = msg.msg_controllen; 1157 m = control; 1158 ctlbuf = (caddr_t)msg.msg_control; 1159 1160 while(m && len > 0) { 1161 unsigned int tocopy; 1162 1163 if (len >= m->m_len) { 1164 tocopy = m->m_len; 1165 } else { 1166 msg.msg_flags |= MSG_CTRUNC; 1167 tocopy = len; 1168 } 1169 1170 error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); 1171 if (error) 1172 goto cleanup; 1173 1174 ctlbuf += tocopy; 1175 len -= tocopy; 1176 m = m->m_next; 1177 } 1178 controllen = ctlbuf - (caddr_t)msg.msg_control; 1179 error = copyout(&controllen, ucontrollenp, 1180 sizeof(*ucontrollenp)); 1181 } 1182 1183 if (error == 0) 1184 error = copyout(&flags, uflagsp, sizeof(*uflagsp)); 1185 1186 cleanup: 1187 if (sa) 1188 kfree(sa, M_SONAME); 1189 iovec_free(&iov, aiov); 1190 if (control) 1191 m_freem(control); 1192 return (error); 1193 } 1194 1195 /* 1196 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1197 * in kernel pointer instead of a userland pointer. This allows us 1198 * to manipulate socket options in the emulation code. 1199 */ 1200 int 1201 kern_setsockopt(int s, struct sockopt *sopt) 1202 { 1203 struct thread *td = curthread; 1204 struct file *fp; 1205 int error; 1206 1207 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1208 return (EFAULT); 1209 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1210 return (EINVAL); 1211 if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1212 return (EINVAL); 1213 1214 error = holdsock(td, s, &fp); 1215 if (error) 1216 return (error); 1217 1218 error = sosetopt((struct socket *)fp->f_data, sopt); 1219 dropfp(td, s, fp); 1220 1221 return (error); 1222 } 1223 1224 /* 1225 * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) 1226 * 1227 * MPALMOSTSAFE 1228 */ 1229 int 1230 sys_setsockopt(struct sysmsg *sysmsg, const struct setsockopt_args *uap) 1231 { 1232 struct thread *td = curthread; 1233 struct sockopt sopt; 1234 int error; 1235 1236 sopt.sopt_level = uap->level; 1237 sopt.sopt_name = uap->name; 1238 sopt.sopt_valsize = uap->valsize; 1239 sopt.sopt_td = td; 1240 sopt.sopt_val = NULL; 1241 1242 if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ 1243 return (EINVAL); 1244 if (uap->val) { 1245 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); 1246 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1247 if (error) 1248 goto out; 1249 } 1250 1251 error = kern_setsockopt(uap->s, &sopt); 1252 out: 1253 if (uap->val) 1254 kfree(sopt.sopt_val, M_TEMP); 1255 return(error); 1256 } 1257 1258 /* 1259 * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an 1260 * in kernel pointer instead of a userland pointer. This allows us 1261 * to manipulate socket options in the emulation code. 1262 */ 1263 int 1264 kern_getsockopt(int s, struct sockopt *sopt) 1265 { 1266 struct thread *td = curthread; 1267 struct file *fp; 1268 int error; 1269 1270 if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) 1271 return (EFAULT); 1272 if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) 1273 return (EINVAL); 1274 1275 error = holdsock(td, s, &fp); 1276 if (error) 1277 return (error); 1278 1279 error = sogetopt((struct socket *)fp->f_data, sopt); 1280 dropfp(td, s, fp); 1281 1282 return (error); 1283 } 1284 1285 /* 1286 * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) 1287 * 1288 * MPALMOSTSAFE 1289 */ 1290 int 1291 sys_getsockopt(struct sysmsg *sysmsg, const struct getsockopt_args *uap) 1292 { 1293 struct thread *td = curthread; 1294 struct sockopt sopt; 1295 int error, valsize, valszmax, mflag = 0; 1296 1297 if (uap->val) { 1298 error = copyin(uap->avalsize, &valsize, sizeof(valsize)); 1299 if (error) 1300 return (error); 1301 } else { 1302 valsize = 0; 1303 } 1304 1305 sopt.sopt_level = uap->level; 1306 sopt.sopt_name = uap->name; 1307 sopt.sopt_valsize = valsize; 1308 sopt.sopt_td = td; 1309 sopt.sopt_val = NULL; 1310 1311 if (td->td_proc->p_ucred->cr_uid == 0) { 1312 valszmax = SOMAXOPT_SIZE0; 1313 mflag = M_NULLOK; 1314 } else { 1315 valszmax = SOMAXOPT_SIZE; 1316 } 1317 if (sopt.sopt_valsize > valszmax) /* unsigned */ 1318 return (EINVAL); 1319 if (uap->val) { 1320 sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, 1321 M_WAITOK | mflag); 1322 if (sopt.sopt_val == NULL) 1323 return (ENOBUFS); 1324 error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); 1325 if (error) 1326 goto out; 1327 } 1328 1329 error = kern_getsockopt(uap->s, &sopt); 1330 if (error) 1331 goto out; 1332 valsize = sopt.sopt_valsize; 1333 error = copyout(&valsize, uap->avalsize, sizeof(valsize)); 1334 if (error) 1335 goto out; 1336 if (uap->val) 1337 error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); 1338 out: 1339 if (uap->val) 1340 kfree(sopt.sopt_val, M_TEMP); 1341 return (error); 1342 } 1343 1344 /* 1345 * The second argument to kern_getsockname() is a handle to a struct sockaddr. 1346 * This allows kern_getsockname() to return a pointer to an allocated struct 1347 * sockaddr which must be freed later with FREE(). The caller must 1348 * initialize *name to NULL. 1349 */ 1350 int 1351 kern_getsockname(int s, struct sockaddr **name, int *namelen) 1352 { 1353 struct thread *td = curthread; 1354 struct file *fp; 1355 struct socket *so; 1356 struct sockaddr *sa = NULL; 1357 int error; 1358 1359 error = holdsock(td, s, &fp); 1360 if (error) 1361 return (error); 1362 if (*namelen < 0) { 1363 fdrop(fp); 1364 return (EINVAL); 1365 } 1366 so = (struct socket *)fp->f_data; 1367 error = so_pru_sockaddr(so, &sa); 1368 if (error == 0) { 1369 if (sa == NULL) { 1370 *namelen = 0; 1371 } else { 1372 *namelen = MIN(*namelen, sa->sa_len); 1373 *name = sa; 1374 } 1375 } 1376 dropfp(td, s, fp); 1377 1378 return (error); 1379 } 1380 1381 /* 1382 * getsockname_args(int fdes, caddr_t asa, int *alen) 1383 * 1384 * Get socket name. 1385 * 1386 * MPALMOSTSAFE 1387 */ 1388 int 1389 sys_getsockname(struct sysmsg *sysmsg, const struct getsockname_args *uap) 1390 { 1391 struct sockaddr *sa = NULL; 1392 struct sockaddr satmp; 1393 int error, sa_len_in, sa_len_out; 1394 1395 error = copyin(uap->alen, &sa_len_in, sizeof(sa_len_in)); 1396 if (error) 1397 return (error); 1398 1399 sa_len_out = sa_len_in; 1400 error = kern_getsockname(uap->fdes, &sa, &sa_len_out); 1401 1402 if (error == 0) { 1403 if (sa) { 1404 prison_local_ip(curthread, sa); 1405 error = copyout(sa, uap->asa, sa_len_out); 1406 } else { 1407 /* 1408 * unnamed uipc sockets don't bother storing 1409 * sockaddr, simulate an AF_LOCAL sockaddr. 1410 */ 1411 sa_len_out = sizeof(satmp); 1412 if (sa_len_out > sa_len_in) 1413 sa_len_out = sa_len_in; 1414 if (sa_len_out < 0) 1415 sa_len_out = 0; 1416 bzero(&satmp, sizeof(satmp)); 1417 satmp.sa_len = sa_len_out; 1418 satmp.sa_family = AF_LOCAL; 1419 error = copyout(&satmp, uap->asa, sa_len_out); 1420 } 1421 } 1422 if (error == 0 && sa_len_out != sa_len_in) 1423 error = copyout(&sa_len_out, uap->alen, sizeof(*uap->alen)); 1424 if (sa) 1425 kfree(sa, M_SONAME); 1426 return (error); 1427 } 1428 1429 /* 1430 * The second argument to kern_getpeername() is a handle to a struct sockaddr. 1431 * This allows kern_getpeername() to return a pointer to an allocated struct 1432 * sockaddr which must be freed later with FREE(). The caller must 1433 * initialize *name to NULL. 1434 */ 1435 int 1436 kern_getpeername(int s, struct sockaddr **name, int *namelen) 1437 { 1438 struct thread *td = curthread; 1439 struct file *fp; 1440 struct socket *so; 1441 struct sockaddr *sa = NULL; 1442 int error; 1443 1444 error = holdsock(td, s, &fp); 1445 if (error) 1446 return (error); 1447 if (*namelen < 0) { 1448 fdrop(fp); 1449 return (EINVAL); 1450 } 1451 so = (struct socket *)fp->f_data; 1452 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1453 fdrop(fp); 1454 return (ENOTCONN); 1455 } 1456 error = so_pru_peeraddr(so, &sa); 1457 if (error == 0) { 1458 if (sa == NULL) { 1459 *namelen = 0; 1460 } else { 1461 *namelen = MIN(*namelen, sa->sa_len); 1462 *name = sa; 1463 } 1464 } 1465 dropfp(td, s, fp); 1466 1467 return (error); 1468 } 1469 1470 /* 1471 * getpeername_args(int fdes, caddr_t asa, int *alen) 1472 * 1473 * Get name of peer for connected socket. 1474 * 1475 * MPALMOSTSAFE 1476 */ 1477 int 1478 sys_getpeername(struct sysmsg *sysmsg, const struct getpeername_args *uap) 1479 { 1480 struct sockaddr *sa = NULL; 1481 int error, sa_len; 1482 1483 error = copyin(uap->alen, &sa_len, sizeof(sa_len)); 1484 if (error) 1485 return (error); 1486 1487 error = kern_getpeername(uap->fdes, &sa, &sa_len); 1488 1489 if (error == 0) { 1490 prison_local_ip(curthread, sa); 1491 error = copyout(sa, uap->asa, sa_len); 1492 } 1493 if (error == 0) 1494 error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); 1495 if (sa) 1496 kfree(sa, M_SONAME); 1497 return (error); 1498 } 1499 1500 int 1501 getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) 1502 { 1503 struct sockaddr *sa; 1504 int error; 1505 1506 *namp = NULL; 1507 if (len > SOCK_MAXADDRLEN) 1508 return ENAMETOOLONG; 1509 if (len < offsetof(struct sockaddr, sa_data[0])) 1510 return EDOM; 1511 sa = kmalloc(len, M_SONAME, M_WAITOK); 1512 error = copyin(uaddr, sa, len); 1513 if (error) { 1514 kfree(sa, M_SONAME); 1515 } else { 1516 sa->sa_len = len; 1517 *namp = sa; 1518 } 1519 return error; 1520 } 1521 1522 /* 1523 * Detach a mapped page and release resources back to the system. 1524 * We must release our wiring and if the object is ripped out 1525 * from under the vm_page we become responsible for freeing the 1526 * page. 1527 * 1528 * MPSAFE 1529 */ 1530 static void 1531 sf_buf_mfree(void *arg) 1532 { 1533 struct sf_buf *sf = arg; 1534 vm_page_t m; 1535 1536 m = sf_buf_page(sf); 1537 if (sf_buf_free(sf)) { 1538 /* sf invalid now */ 1539 vm_page_sbusy_drop(m); 1540 #if 0 1541 if (m->object == NULL && 1542 m->wire_count == 0 && 1543 (m->flags & PG_NEED_COMMIT) == 0) { 1544 vm_page_free(m); 1545 } else { 1546 vm_page_wakeup(m); 1547 } 1548 #endif 1549 } 1550 } 1551 1552 /* 1553 * sendfile(2). 1554 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1555 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1556 * 1557 * Send a file specified by 'fd' and starting at 'offset' to a socket 1558 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1559 * nbytes == 0. Optionally add a header and/or trailer to the socket 1560 * output. If specified, write the total number of bytes sent into *sbytes. 1561 * 1562 * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused 1563 * the headers to count against the remaining bytes to be sent from 1564 * the file descriptor. We may wish to implement a compatibility syscall 1565 * in the future. 1566 * 1567 * MPALMOSTSAFE 1568 */ 1569 int 1570 sys_sendfile(struct sysmsg *sysmsg, const struct sendfile_args *uap) 1571 { 1572 struct thread *td = curthread; 1573 struct file *fp; 1574 struct vnode *vp = NULL; 1575 struct sf_hdtr hdtr; 1576 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 1577 struct uio auio; 1578 struct mbuf *mheader = NULL; 1579 size_t hbytes = 0; 1580 size_t tbytes; 1581 off_t hdtr_size = 0; 1582 off_t sbytes; 1583 int error; 1584 1585 /* 1586 * Do argument checking. Must be a regular file in, stream 1587 * type and connected socket out, positive offset. 1588 */ 1589 fp = holdfp(td, uap->fd, FREAD); 1590 if (fp == NULL) { 1591 return (EBADF); 1592 } 1593 if (fp->f_type != DTYPE_VNODE) { 1594 fdrop(fp); 1595 return (EINVAL); 1596 } 1597 vp = (struct vnode *)fp->f_data; 1598 vref(vp); 1599 dropfp(td, uap->fd, fp); 1600 1601 /* 1602 * If specified, get the pointer to the sf_hdtr struct for 1603 * any headers/trailers. 1604 */ 1605 if (uap->hdtr) { 1606 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1607 if (error) 1608 goto done; 1609 /* 1610 * Send any headers. 1611 */ 1612 if (hdtr.headers) { 1613 error = iovec_copyin(hdtr.headers, &iov, aiov, 1614 hdtr.hdr_cnt, &hbytes); 1615 if (error) 1616 goto done; 1617 auio.uio_iov = iov; 1618 auio.uio_iovcnt = hdtr.hdr_cnt; 1619 auio.uio_offset = 0; 1620 auio.uio_segflg = UIO_USERSPACE; 1621 auio.uio_rw = UIO_WRITE; 1622 auio.uio_td = td; 1623 auio.uio_resid = hbytes; 1624 1625 mheader = m_uiomove(&auio); 1626 1627 iovec_free(&iov, aiov); 1628 if (mheader == NULL) 1629 goto done; 1630 } 1631 } 1632 1633 error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, 1634 &sbytes, uap->flags); 1635 if (error) 1636 goto done; 1637 1638 /* 1639 * Send trailers. Wimp out and use writev(2). 1640 */ 1641 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1642 error = iovec_copyin(hdtr.trailers, &iov, aiov, 1643 hdtr.trl_cnt, &auio.uio_resid); 1644 if (error) 1645 goto done; 1646 auio.uio_iov = iov; 1647 auio.uio_iovcnt = hdtr.trl_cnt; 1648 auio.uio_offset = 0; 1649 auio.uio_segflg = UIO_USERSPACE; 1650 auio.uio_rw = UIO_WRITE; 1651 auio.uio_td = td; 1652 1653 tbytes = 0; /* avoid gcc warnings */ 1654 error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); 1655 1656 iovec_free(&iov, aiov); 1657 if (error) 1658 goto done; 1659 hdtr_size += tbytes; /* trailer bytes successfully sent */ 1660 } 1661 1662 done: 1663 if (vp) 1664 vrele(vp); 1665 if (uap->sbytes != NULL) { 1666 sbytes += hdtr_size; 1667 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1668 } 1669 return (error); 1670 } 1671 1672 int 1673 kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, 1674 struct mbuf *mheader, off_t *sbytes, int flags) 1675 { 1676 struct thread *td = curthread; 1677 struct vm_object *obj; 1678 struct socket *so; 1679 struct file *fp; 1680 struct mbuf *m, *mp; 1681 struct sf_buf *sf; 1682 struct vm_page *pg; 1683 off_t off, xfsize, xbytes; 1684 off_t hbytes = 0; 1685 int error = 0; 1686 1687 if (vp->v_type != VREG) { 1688 error = EINVAL; 1689 goto done0; 1690 } 1691 if ((obj = vp->v_object) == NULL) { 1692 error = EINVAL; 1693 goto done0; 1694 } 1695 error = holdsock(td, sfd, &fp); 1696 if (error) 1697 goto done0; 1698 so = (struct socket *)fp->f_data; 1699 if (so->so_type != SOCK_STREAM) { 1700 error = EINVAL; 1701 goto done1; 1702 } 1703 if ((so->so_state & SS_ISCONNECTED) == 0) { 1704 error = ENOTCONN; 1705 goto done1; 1706 } 1707 if (offset < 0) { 1708 error = EINVAL; 1709 goto done1; 1710 } 1711 1712 /* 1713 * preallocation is required for asynchronous passing of mbufs, 1714 * otherwise we can wind up building up an infinite number of 1715 * mbufs during the asynchronous latency. 1716 */ 1717 if ((so->so_snd.ssb_flags & (SSB_PREALLOC | SSB_STOPSUPP)) == 0) { 1718 error = EINVAL; 1719 goto done1; 1720 } 1721 1722 *sbytes = 0; 1723 xbytes = 0; 1724 1725 /* 1726 * Protect against multiple writers to the socket. 1727 * We need at least a shared lock on the VM object 1728 */ 1729 ssb_lock(&so->so_snd, M_WAITOK); 1730 vm_object_hold_shared(obj); 1731 1732 /* 1733 * Loop through the pages in the file, starting with the requested 1734 * offset. Get a file page (do I/O if necessary), map the file page 1735 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1736 * it on the socket. 1737 */ 1738 for (off = offset; ; 1739 off += xfsize, *sbytes += xfsize + hbytes, xbytes += xfsize) { 1740 vm_pindex_t pindex; 1741 vm_offset_t pgoff; 1742 long space; 1743 int loops; 1744 1745 pindex = OFF_TO_IDX(off); 1746 loops = 0; 1747 1748 retry_lookup: 1749 /* 1750 * Calculate the amount to transfer. Not to exceed a page, 1751 * the EOF, or the passed in nbytes. 1752 */ 1753 xfsize = vp->v_filesize - off; 1754 if (xfsize > PAGE_SIZE) 1755 xfsize = PAGE_SIZE; 1756 pgoff = (vm_offset_t)(off & PAGE_MASK); 1757 if (PAGE_SIZE - pgoff < xfsize) 1758 xfsize = PAGE_SIZE - pgoff; 1759 if (nbytes && xfsize > (nbytes - xbytes)) 1760 xfsize = nbytes - xbytes; 1761 if (xfsize <= 0) 1762 break; 1763 /* 1764 * Optimize the non-blocking case by looking at the socket space 1765 * before going to the extra work of constituting the sf_buf. 1766 */ 1767 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1768 space = ssb_space_prealloc(&so->so_snd); 1769 else 1770 space = ssb_space(&so->so_snd); 1771 1772 if ((fp->f_flag & FNONBLOCK) && space <= 0) { 1773 if (so->so_state & SS_CANTSENDMORE) 1774 error = EPIPE; 1775 else 1776 error = EAGAIN; 1777 goto done; 1778 } 1779 1780 /* 1781 * Attempt to look up the page. 1782 * 1783 * Try to find the data using a shared vm_object token and 1784 * vm_page_lookup_sbusy_try() first. 1785 * 1786 * If data is missing, use a UIO_NOCOPY VOP_READ to load 1787 * the missing data and loop back up. We avoid all sorts 1788 * of problems by not trying to hold onto the page during 1789 * the I/O. 1790 * 1791 * NOTE: The soft-busy will temporary block filesystem 1792 * truncation operations when a file is removed 1793 * while the sendfile is running. 1794 */ 1795 pg = vm_page_lookup_sbusy_try(obj, pindex, pgoff, xfsize); 1796 if (pg == NULL) { 1797 struct uio auio; 1798 struct iovec aiov; 1799 int bsize; 1800 1801 if (++loops > 100000) { 1802 kprintf("sendfile: VOP operation failed " 1803 "to retain page\n"); 1804 error = EIO; 1805 goto done; 1806 } 1807 1808 vm_object_drop(obj); 1809 bsize = vp->v_mount->mnt_stat.f_iosize; 1810 auio.uio_iov = &aiov; 1811 auio.uio_iovcnt = 1; 1812 aiov.iov_base = 0; 1813 aiov.iov_len = MAXBSIZE; 1814 auio.uio_resid = MAXBSIZE; 1815 auio.uio_offset = trunc_page(off); 1816 auio.uio_segflg = UIO_NOCOPY; 1817 auio.uio_rw = UIO_READ; 1818 auio.uio_td = td; 1819 1820 vn_lock(vp, LK_SHARED | LK_RETRY); 1821 error = VOP_READ_FP(vp, &auio, 1822 IO_VMIO | ((MAXBSIZE / bsize) << 16), 1823 td->td_ucred, fp); 1824 vn_unlock(vp); 1825 vm_object_hold_shared(obj); 1826 1827 if (error) 1828 goto done; 1829 goto retry_lookup; 1830 } 1831 1832 /* 1833 * Get a sendfile buf. We usually wait as long as necessary, 1834 * but this wait can be interrupted. 1835 */ 1836 if ((sf = sf_buf_alloc(pg)) == NULL) { 1837 vm_page_sbusy_drop(pg); 1838 /* vm_page_try_to_free(pg); */ 1839 error = EINTR; 1840 goto done; 1841 } 1842 1843 /* 1844 * Get an mbuf header and set it up as having external storage. 1845 */ 1846 MGETHDR(m, M_WAITOK, MT_DATA); 1847 if (m == NULL) { 1848 error = ENOBUFS; 1849 vm_page_sbusy_drop(pg); 1850 /* vm_page_try_to_free(pg); */ 1851 sf_buf_free(sf); 1852 goto done; 1853 } 1854 1855 m->m_ext.ext_free = sf_buf_mfree; 1856 m->m_ext.ext_ref = sf_buf_ref; 1857 m->m_ext.ext_arg = sf; 1858 m->m_ext.ext_buf = (void *)sf_buf_kva(sf); 1859 m->m_ext.ext_size = PAGE_SIZE; 1860 m->m_data = (char *)sf_buf_kva(sf) + pgoff; 1861 m->m_flags |= M_EXT; 1862 m->m_pkthdr.len = m->m_len = xfsize; 1863 KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); 1864 1865 if (mheader != NULL) { 1866 hbytes = mheader->m_pkthdr.len; 1867 mheader->m_pkthdr.len += m->m_pkthdr.len; 1868 m_cat(mheader, m); 1869 m = mheader; 1870 mheader = NULL; 1871 } else { 1872 hbytes = 0; 1873 } 1874 1875 /* 1876 * Add the buffer to the socket buffer chain. 1877 */ 1878 crit_enter(); 1879 retry_space: 1880 /* 1881 * Make sure that the socket is still able to take more data. 1882 * CANTSENDMORE being true usually means that the connection 1883 * was closed. so_error is true when an error was sensed after 1884 * a previous send. 1885 * The state is checked after the page mapping and buffer 1886 * allocation above since those operations may block and make 1887 * any socket checks stale. From this point forward, nothing 1888 * blocks before the pru_send (or more accurately, any blocking 1889 * results in a loop back to here to re-check). 1890 */ 1891 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1892 if (so->so_state & SS_CANTSENDMORE) { 1893 error = EPIPE; 1894 } else { 1895 error = so->so_error; 1896 so->so_error = 0; 1897 } 1898 m_freem(m); 1899 crit_exit(); 1900 goto done; 1901 } 1902 /* 1903 * Wait for socket space to become available. We do this just 1904 * after checking the connection state above in order to avoid 1905 * a race condition with ssb_wait(). 1906 */ 1907 if (so->so_snd.ssb_flags & SSB_PREALLOC) 1908 space = ssb_space_prealloc(&so->so_snd); 1909 else 1910 space = ssb_space(&so->so_snd); 1911 1912 if (space < m->m_pkthdr.len && space < so->so_snd.ssb_lowat) { 1913 if (fp->f_flag & FNONBLOCK) { 1914 m_freem(m); 1915 crit_exit(); 1916 error = EAGAIN; 1917 goto done; 1918 } 1919 error = ssb_wait(&so->so_snd); 1920 /* 1921 * An error from ssb_wait usually indicates that we've 1922 * been interrupted by a signal. If we've sent anything 1923 * then return bytes sent, otherwise return the error. 1924 */ 1925 if (error) { 1926 m_freem(m); 1927 crit_exit(); 1928 goto done; 1929 } 1930 goto retry_space; 1931 } 1932 1933 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1934 for (mp = m; mp != NULL; mp = mp->m_next) 1935 ssb_preallocstream(&so->so_snd, mp); 1936 } 1937 if (use_sendfile_async) 1938 error = so_pru_senda(so, 0, m, NULL, NULL, td); 1939 else 1940 error = so_pru_send(so, 0, m, NULL, NULL, td); 1941 1942 crit_exit(); 1943 if (error) 1944 goto done; 1945 } 1946 if (mheader != NULL) { 1947 *sbytes += mheader->m_pkthdr.len; 1948 1949 if (so->so_snd.ssb_flags & SSB_PREALLOC) { 1950 for (mp = mheader; mp != NULL; mp = mp->m_next) 1951 ssb_preallocstream(&so->so_snd, mp); 1952 } 1953 if (use_sendfile_async) 1954 error = so_pru_senda(so, 0, mheader, NULL, NULL, td); 1955 else 1956 error = so_pru_send(so, 0, mheader, NULL, NULL, td); 1957 1958 mheader = NULL; 1959 } 1960 done: 1961 vm_object_drop(obj); 1962 ssb_unlock(&so->so_snd); 1963 done1: 1964 dropfp(td, sfd, fp); 1965 done0: 1966 if (mheader != NULL) 1967 m_freem(mheader); 1968 return (error); 1969 } 1970