kern_sendfile.c revision 62378
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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 37 * $FreeBSD: head/sys/kern/uipc_syscalls.c 62378 2000-07-02 08:08:09Z green $ 38 */ 39 40#include "opt_compat.h" 41#include "opt_ktrace.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/kernel.h> 46#include <sys/sysproto.h> 47#include <sys/malloc.h> 48#include <sys/filedesc.h> 49#include <sys/event.h> 50#include <sys/proc.h> 51#include <sys/fcntl.h> 52#include <sys/file.h> 53#include <sys/mbuf.h> 54#include <sys/protosw.h> 55#include <sys/socket.h> 56#include <sys/socketvar.h> 57#include <sys/signalvar.h> 58#include <sys/uio.h> 59#include <sys/vnode.h> 60#include <sys/lock.h> 61#include <sys/mount.h> 62#ifdef KTRACE 63#include <sys/ktrace.h> 64#endif 65#include <vm/vm.h> 66#include <vm/vm_object.h> 67#include <vm/vm_page.h> 68#include <vm/vm_pageout.h> 69#include <vm/vm_kern.h> 70#include <vm/vm_extern.h> 71 72static void sf_buf_init(void *arg); 73SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL) 74static struct sf_buf *sf_buf_alloc(void); 75static void sf_buf_ref(caddr_t addr, u_int size); 76static void sf_buf_free(caddr_t addr, u_int size); 77 78static int sendit __P((struct proc *p, int s, struct msghdr *mp, int flags)); 79static int recvit __P((struct proc *p, int s, struct msghdr *mp, 80 caddr_t namelenp)); 81 82static int accept1 __P((struct proc *p, struct accept_args *uap, int compat)); 83static int getsockname1 __P((struct proc *p, struct getsockname_args *uap, 84 int compat)); 85static int getpeername1 __P((struct proc *p, struct getpeername_args *uap, 86 int compat)); 87 88static SLIST_HEAD(, sf_buf) sf_freelist; 89static vm_offset_t sf_base; 90static struct sf_buf *sf_bufs; 91static int sf_buf_alloc_want; 92 93/* 94 * System call interface to the socket abstraction. 95 */ 96#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 97#define COMPAT_OLDSOCK 98#endif 99 100extern struct fileops socketops; 101 102int 103socket(p, uap) 104 struct proc *p; 105 register struct socket_args /* { 106 int domain; 107 int type; 108 int protocol; 109 } */ *uap; 110{ 111 struct filedesc *fdp = p->p_fd; 112 struct socket *so; 113 struct file *fp; 114 int fd, error; 115 116 error = falloc(p, &fp, &fd); 117 if (error) 118 return (error); 119 error = socreate(uap->domain, &so, uap->type, uap->protocol, p); 120 if (error) { 121 fdp->fd_ofiles[fd] = 0; 122 ffree(fp); 123 } else { 124 fp->f_data = (caddr_t)so; 125 fp->f_flag = FREAD|FWRITE; 126 fp->f_ops = &socketops; 127 fp->f_type = DTYPE_SOCKET; 128 p->p_retval[0] = fd; 129 } 130 return (error); 131} 132 133/* ARGSUSED */ 134int 135bind(p, uap) 136 struct proc *p; 137 register struct bind_args /* { 138 int s; 139 caddr_t name; 140 int namelen; 141 } */ *uap; 142{ 143 struct file *fp; 144 struct sockaddr *sa; 145 int error; 146 147 error = getsock(p->p_fd, uap->s, &fp); 148 if (error) 149 return (error); 150 error = getsockaddr(&sa, uap->name, uap->namelen); 151 if (error) 152 return (error); 153 error = sobind((struct socket *)fp->f_data, sa, p); 154 FREE(sa, M_SONAME); 155 return (error); 156} 157 158/* ARGSUSED */ 159int 160listen(p, uap) 161 struct proc *p; 162 register struct listen_args /* { 163 int s; 164 int backlog; 165 } */ *uap; 166{ 167 struct file *fp; 168 int error; 169 170 error = getsock(p->p_fd, uap->s, &fp); 171 if (error) 172 return (error); 173 return (solisten((struct socket *)fp->f_data, uap->backlog, p)); 174} 175 176static int 177accept1(p, uap, compat) 178 struct proc *p; 179 register struct accept_args /* { 180 int s; 181 caddr_t name; 182 int *anamelen; 183 } */ *uap; 184 int compat; 185{ 186 struct filedesc *fdp = p->p_fd; 187 struct file *fp; 188 struct sockaddr *sa; 189 int namelen, error, s; 190 struct socket *head, *so; 191 int fd; 192 short fflag; /* type must match fp->f_flag */ 193 194 if (uap->name) { 195 error = copyin((caddr_t)uap->anamelen, (caddr_t)&namelen, 196 sizeof (namelen)); 197 if(error) 198 return (error); 199 } 200 error = getsock(fdp, uap->s, &fp); 201 if (error) 202 return (error); 203 s = splnet(); 204 head = (struct socket *)fp->f_data; 205 if ((head->so_options & SO_ACCEPTCONN) == 0) { 206 splx(s); 207 return (EINVAL); 208 } 209 if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) { 210 splx(s); 211 return (EWOULDBLOCK); 212 } 213 while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) { 214 if (head->so_state & SS_CANTRCVMORE) { 215 head->so_error = ECONNABORTED; 216 break; 217 } 218 error = tsleep((caddr_t)&head->so_timeo, PSOCK | PCATCH, 219 "accept", 0); 220 if (error) { 221 splx(s); 222 return (error); 223 } 224 } 225 if (head->so_error) { 226 error = head->so_error; 227 head->so_error = 0; 228 splx(s); 229 return (error); 230 } 231 232 /* 233 * At this point we know that there is at least one connection 234 * ready to be accepted. Remove it from the queue prior to 235 * allocating the file descriptor for it since falloc() may 236 * block allowing another process to accept the connection 237 * instead. 238 */ 239 so = TAILQ_FIRST(&head->so_comp); 240 TAILQ_REMOVE(&head->so_comp, so, so_list); 241 head->so_qlen--; 242 243 fflag = fp->f_flag; 244 error = falloc(p, &fp, &fd); 245 if (error) { 246 /* 247 * Probably ran out of file descriptors. Put the 248 * unaccepted connection back onto the queue and 249 * do another wakeup so some other process might 250 * have a chance at it. 251 */ 252 TAILQ_INSERT_HEAD(&head->so_comp, so, so_list); 253 head->so_qlen++; 254 wakeup_one(&head->so_timeo); 255 splx(s); 256 return (error); 257 } else 258 p->p_retval[0] = fd; 259 260 /* connection has been removed from the listen queue */ 261 KNOTE(&head->so_rcv.sb_sel.si_note, 0); 262 263 so->so_state &= ~SS_COMP; 264 so->so_head = NULL; 265 if (head->so_sigio != NULL) 266 fsetown(fgetown(head->so_sigio), &so->so_sigio); 267 268 fp->f_data = (caddr_t)so; 269 fp->f_flag = fflag; 270 fp->f_ops = &socketops; 271 fp->f_type = DTYPE_SOCKET; 272 sa = 0; 273 (void) soaccept(so, &sa); 274 if (sa == 0) { 275 namelen = 0; 276 if (uap->name) 277 goto gotnoname; 278 splx(s); 279 return 0; 280 } 281 if (uap->name) { 282 /* check sa_len before it is destroyed */ 283 if (namelen > sa->sa_len) 284 namelen = sa->sa_len; 285#ifdef COMPAT_OLDSOCK 286 if (compat) 287 ((struct osockaddr *)sa)->sa_family = 288 sa->sa_family; 289#endif 290 error = copyout(sa, (caddr_t)uap->name, (u_int)namelen); 291 if (!error) 292gotnoname: 293 error = copyout((caddr_t)&namelen, 294 (caddr_t)uap->anamelen, sizeof (*uap->anamelen)); 295 } 296 if (sa) 297 FREE(sa, M_SONAME); 298 if (error) { 299 fdp->fd_ofiles[fd] = 0; 300 ffree(fp); 301 } 302 splx(s); 303 return (error); 304} 305 306int 307accept(p, uap) 308 struct proc *p; 309 struct accept_args *uap; 310{ 311 312 return (accept1(p, uap, 0)); 313} 314 315#ifdef COMPAT_OLDSOCK 316int 317oaccept(p, uap) 318 struct proc *p; 319 struct accept_args *uap; 320{ 321 322 return (accept1(p, uap, 1)); 323} 324#endif /* COMPAT_OLDSOCK */ 325 326/* ARGSUSED */ 327int 328connect(p, uap) 329 struct proc *p; 330 register struct connect_args /* { 331 int s; 332 caddr_t name; 333 int namelen; 334 } */ *uap; 335{ 336 struct file *fp; 337 register struct socket *so; 338 struct sockaddr *sa; 339 int error, s; 340 341 error = getsock(p->p_fd, uap->s, &fp); 342 if (error) 343 return (error); 344 so = (struct socket *)fp->f_data; 345 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) 346 return (EALREADY); 347 error = getsockaddr(&sa, uap->name, uap->namelen); 348 if (error) 349 return (error); 350 error = soconnect(so, sa, p); 351 if (error) 352 goto bad; 353 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 354 FREE(sa, M_SONAME); 355 return (EINPROGRESS); 356 } 357 s = splnet(); 358 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 359 error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, 360 "connec", 0); 361 if (error) 362 break; 363 } 364 if (error == 0) { 365 error = so->so_error; 366 so->so_error = 0; 367 } 368 splx(s); 369bad: 370 so->so_state &= ~SS_ISCONNECTING; 371 FREE(sa, M_SONAME); 372 if (error == ERESTART) 373 error = EINTR; 374 return (error); 375} 376 377int 378socketpair(p, uap) 379 struct proc *p; 380 register struct socketpair_args /* { 381 int domain; 382 int type; 383 int protocol; 384 int *rsv; 385 } */ *uap; 386{ 387 register struct filedesc *fdp = p->p_fd; 388 struct file *fp1, *fp2; 389 struct socket *so1, *so2; 390 int fd, error, sv[2]; 391 392 error = socreate(uap->domain, &so1, uap->type, uap->protocol, p); 393 if (error) 394 return (error); 395 error = socreate(uap->domain, &so2, uap->type, uap->protocol, p); 396 if (error) 397 goto free1; 398 error = falloc(p, &fp1, &fd); 399 if (error) 400 goto free2; 401 sv[0] = fd; 402 fp1->f_data = (caddr_t)so1; 403 error = falloc(p, &fp2, &fd); 404 if (error) 405 goto free3; 406 fp2->f_data = (caddr_t)so2; 407 sv[1] = fd; 408 error = soconnect2(so1, so2); 409 if (error) 410 goto free4; 411 if (uap->type == SOCK_DGRAM) { 412 /* 413 * Datagram socket connection is asymmetric. 414 */ 415 error = soconnect2(so2, so1); 416 if (error) 417 goto free4; 418 } 419 fp1->f_flag = fp2->f_flag = FREAD|FWRITE; 420 fp1->f_ops = fp2->f_ops = &socketops; 421 fp1->f_type = fp2->f_type = DTYPE_SOCKET; 422 error = copyout((caddr_t)sv, (caddr_t)uap->rsv, 2 * sizeof (int)); 423 return (error); 424free4: 425 fdp->fd_ofiles[sv[1]] = 0; 426 ffree(fp2); 427free3: 428 fdp->fd_ofiles[sv[0]] = 0; 429 ffree(fp1); 430free2: 431 (void)soclose(so2); 432free1: 433 (void)soclose(so1); 434 return (error); 435} 436 437static int 438sendit(p, s, mp, flags) 439 register struct proc *p; 440 int s; 441 register struct msghdr *mp; 442 int flags; 443{ 444 struct file *fp; 445 struct uio auio; 446 register struct iovec *iov; 447 register int i; 448 struct mbuf *control; 449 struct sockaddr *to; 450 int len, error; 451 struct socket *so; 452#ifdef KTRACE 453 struct iovec *ktriov = NULL; 454 struct uio ktruio; 455#endif 456 457 error = getsock(p->p_fd, s, &fp); 458 if (error) 459 return (error); 460 auio.uio_iov = mp->msg_iov; 461 auio.uio_iovcnt = mp->msg_iovlen; 462 auio.uio_segflg = UIO_USERSPACE; 463 auio.uio_rw = UIO_WRITE; 464 auio.uio_procp = p; 465 auio.uio_offset = 0; /* XXX */ 466 auio.uio_resid = 0; 467 iov = mp->msg_iov; 468 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 469 if ((auio.uio_resid += iov->iov_len) < 0) 470 return (EINVAL); 471 } 472 if (mp->msg_name) { 473 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); 474 if (error) 475 return (error); 476 } else 477 to = 0; 478 if (mp->msg_control) { 479 if (mp->msg_controllen < sizeof(struct cmsghdr) 480#ifdef COMPAT_OLDSOCK 481 && mp->msg_flags != MSG_COMPAT 482#endif 483 ) { 484 error = EINVAL; 485 goto bad; 486 } 487 error = sockargs(&control, mp->msg_control, 488 mp->msg_controllen, MT_CONTROL); 489 if (error) 490 goto bad; 491#ifdef COMPAT_OLDSOCK 492 if (mp->msg_flags == MSG_COMPAT) { 493 register struct cmsghdr *cm; 494 495 M_PREPEND(control, sizeof(*cm), M_WAIT); 496 if (control == 0) { 497 error = ENOBUFS; 498 goto bad; 499 } else { 500 cm = mtod(control, struct cmsghdr *); 501 cm->cmsg_len = control->m_len; 502 cm->cmsg_level = SOL_SOCKET; 503 cm->cmsg_type = SCM_RIGHTS; 504 } 505 } 506#endif 507 } else 508 control = 0; 509#ifdef KTRACE 510 if (KTRPOINT(p, KTR_GENIO)) { 511 int iovlen = auio.uio_iovcnt * sizeof (struct iovec); 512 513 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 514 bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen); 515 ktruio = auio; 516 } 517#endif 518 len = auio.uio_resid; 519 so = (struct socket *)fp->f_data; 520 error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio, 0, control, 521 flags, p); 522 if (error) { 523 if (auio.uio_resid != len && (error == ERESTART || 524 error == EINTR || error == EWOULDBLOCK)) 525 error = 0; 526 if (error == EPIPE) 527 psignal(p, SIGPIPE); 528 } 529 if (error == 0) 530 p->p_retval[0] = len - auio.uio_resid; 531#ifdef KTRACE 532 if (ktriov != NULL) { 533 if (error == 0) { 534 ktruio.uio_iov = ktriov; 535 ktruio.uio_resid = p->p_retval[0]; 536 ktrgenio(p->p_tracep, s, UIO_WRITE, &ktruio, error); 537 } 538 FREE(ktriov, M_TEMP); 539 } 540#endif 541bad: 542 if (to) 543 FREE(to, M_SONAME); 544 return (error); 545} 546 547int 548sendto(p, uap) 549 struct proc *p; 550 register struct sendto_args /* { 551 int s; 552 caddr_t buf; 553 size_t len; 554 int flags; 555 caddr_t to; 556 int tolen; 557 } */ *uap; 558{ 559 struct msghdr msg; 560 struct iovec aiov; 561 562 msg.msg_name = uap->to; 563 msg.msg_namelen = uap->tolen; 564 msg.msg_iov = &aiov; 565 msg.msg_iovlen = 1; 566 msg.msg_control = 0; 567#ifdef COMPAT_OLDSOCK 568 msg.msg_flags = 0; 569#endif 570 aiov.iov_base = uap->buf; 571 aiov.iov_len = uap->len; 572 return (sendit(p, uap->s, &msg, uap->flags)); 573} 574 575#ifdef COMPAT_OLDSOCK 576int 577osend(p, uap) 578 struct proc *p; 579 register struct osend_args /* { 580 int s; 581 caddr_t buf; 582 int len; 583 int flags; 584 } */ *uap; 585{ 586 struct msghdr msg; 587 struct iovec aiov; 588 589 msg.msg_name = 0; 590 msg.msg_namelen = 0; 591 msg.msg_iov = &aiov; 592 msg.msg_iovlen = 1; 593 aiov.iov_base = uap->buf; 594 aiov.iov_len = uap->len; 595 msg.msg_control = 0; 596 msg.msg_flags = 0; 597 return (sendit(p, uap->s, &msg, uap->flags)); 598} 599 600int 601osendmsg(p, uap) 602 struct proc *p; 603 register struct osendmsg_args /* { 604 int s; 605 caddr_t msg; 606 int flags; 607 } */ *uap; 608{ 609 struct msghdr msg; 610 struct iovec aiov[UIO_SMALLIOV], *iov; 611 int error; 612 613 error = copyin(uap->msg, (caddr_t)&msg, sizeof (struct omsghdr)); 614 if (error) 615 return (error); 616 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 617 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) 618 return (EMSGSIZE); 619 MALLOC(iov, struct iovec *, 620 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 621 M_WAITOK); 622 } else 623 iov = aiov; 624 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 625 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 626 if (error) 627 goto done; 628 msg.msg_flags = MSG_COMPAT; 629 msg.msg_iov = iov; 630 error = sendit(p, uap->s, &msg, uap->flags); 631done: 632 if (iov != aiov) 633 FREE(iov, M_IOV); 634 return (error); 635} 636#endif 637 638int 639sendmsg(p, uap) 640 struct proc *p; 641 register struct sendmsg_args /* { 642 int s; 643 caddr_t msg; 644 int flags; 645 } */ *uap; 646{ 647 struct msghdr msg; 648 struct iovec aiov[UIO_SMALLIOV], *iov; 649 int error; 650 651 error = copyin(uap->msg, (caddr_t)&msg, sizeof (msg)); 652 if (error) 653 return (error); 654 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 655 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) 656 return (EMSGSIZE); 657 MALLOC(iov, struct iovec *, 658 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 659 M_WAITOK); 660 } else 661 iov = aiov; 662 if (msg.msg_iovlen && 663 (error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 664 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))))) 665 goto done; 666 msg.msg_iov = iov; 667#ifdef COMPAT_OLDSOCK 668 msg.msg_flags = 0; 669#endif 670 error = sendit(p, uap->s, &msg, uap->flags); 671done: 672 if (iov != aiov) 673 FREE(iov, M_IOV); 674 return (error); 675} 676 677static int 678recvit(p, s, mp, namelenp) 679 register struct proc *p; 680 int s; 681 register struct msghdr *mp; 682 caddr_t namelenp; 683{ 684 struct file *fp; 685 struct uio auio; 686 register struct iovec *iov; 687 register int i; 688 int len, error; 689 struct mbuf *m, *control = 0; 690 caddr_t ctlbuf; 691 struct socket *so; 692 struct sockaddr *fromsa = 0; 693#ifdef KTRACE 694 struct iovec *ktriov = NULL; 695 struct uio ktruio; 696#endif 697 698 error = getsock(p->p_fd, s, &fp); 699 if (error) 700 return (error); 701 auio.uio_iov = mp->msg_iov; 702 auio.uio_iovcnt = mp->msg_iovlen; 703 auio.uio_segflg = UIO_USERSPACE; 704 auio.uio_rw = UIO_READ; 705 auio.uio_procp = p; 706 auio.uio_offset = 0; /* XXX */ 707 auio.uio_resid = 0; 708 iov = mp->msg_iov; 709 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 710 if ((auio.uio_resid += iov->iov_len) < 0) 711 return (EINVAL); 712 } 713#ifdef KTRACE 714 if (KTRPOINT(p, KTR_GENIO)) { 715 int iovlen = auio.uio_iovcnt * sizeof (struct iovec); 716 717 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 718 bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen); 719 ktruio = auio; 720 } 721#endif 722 len = auio.uio_resid; 723 so = (struct socket *)fp->f_data; 724 error = so->so_proto->pr_usrreqs->pru_soreceive(so, &fromsa, &auio, 725 (struct mbuf **)0, mp->msg_control ? &control : (struct mbuf **)0, 726 &mp->msg_flags); 727 if (error) { 728 if (auio.uio_resid != len && (error == ERESTART || 729 error == EINTR || error == EWOULDBLOCK)) 730 error = 0; 731 } 732#ifdef KTRACE 733 if (ktriov != NULL) { 734 if (error == 0) { 735 ktruio.uio_iov = ktriov; 736 ktruio.uio_resid = len - auio.uio_resid; 737 ktrgenio(p->p_tracep, s, UIO_READ, &ktruio, error); 738 } 739 FREE(ktriov, M_TEMP); 740 } 741#endif 742 if (error) 743 goto out; 744 p->p_retval[0] = len - auio.uio_resid; 745 if (mp->msg_name) { 746 len = mp->msg_namelen; 747 if (len <= 0 || fromsa == 0) 748 len = 0; 749 else { 750#ifndef MIN 751#define MIN(a,b) ((a)>(b)?(b):(a)) 752#endif 753 /* save sa_len before it is destroyed by MSG_COMPAT */ 754 len = MIN(len, fromsa->sa_len); 755#ifdef COMPAT_OLDSOCK 756 if (mp->msg_flags & MSG_COMPAT) 757 ((struct osockaddr *)fromsa)->sa_family = 758 fromsa->sa_family; 759#endif 760 error = copyout(fromsa, 761 (caddr_t)mp->msg_name, (unsigned)len); 762 if (error) 763 goto out; 764 } 765 mp->msg_namelen = len; 766 if (namelenp && 767 (error = copyout((caddr_t)&len, namelenp, sizeof (int)))) { 768#ifdef COMPAT_OLDSOCK 769 if (mp->msg_flags & MSG_COMPAT) 770 error = 0; /* old recvfrom didn't check */ 771 else 772#endif 773 goto out; 774 } 775 } 776 if (mp->msg_control) { 777#ifdef COMPAT_OLDSOCK 778 /* 779 * We assume that old recvmsg calls won't receive access 780 * rights and other control info, esp. as control info 781 * is always optional and those options didn't exist in 4.3. 782 * If we receive rights, trim the cmsghdr; anything else 783 * is tossed. 784 */ 785 if (control && mp->msg_flags & MSG_COMPAT) { 786 if (mtod(control, struct cmsghdr *)->cmsg_level != 787 SOL_SOCKET || 788 mtod(control, struct cmsghdr *)->cmsg_type != 789 SCM_RIGHTS) { 790 mp->msg_controllen = 0; 791 goto out; 792 } 793 control->m_len -= sizeof (struct cmsghdr); 794 control->m_data += sizeof (struct cmsghdr); 795 } 796#endif 797 len = mp->msg_controllen; 798 m = control; 799 mp->msg_controllen = 0; 800 ctlbuf = (caddr_t) mp->msg_control; 801 802 while (m && len > 0) { 803 unsigned int tocopy; 804 805 if (len >= m->m_len) 806 tocopy = m->m_len; 807 else { 808 mp->msg_flags |= MSG_CTRUNC; 809 tocopy = len; 810 } 811 812 if ((error = copyout((caddr_t)mtod(m, caddr_t), 813 ctlbuf, tocopy)) != 0) 814 goto out; 815 816 ctlbuf += tocopy; 817 len -= tocopy; 818 m = m->m_next; 819 } 820 mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control; 821 } 822out: 823 if (fromsa) 824 FREE(fromsa, M_SONAME); 825 if (control) 826 m_freem(control); 827 return (error); 828} 829 830int 831recvfrom(p, uap) 832 struct proc *p; 833 register struct recvfrom_args /* { 834 int s; 835 caddr_t buf; 836 size_t len; 837 int flags; 838 caddr_t from; 839 int *fromlenaddr; 840 } */ *uap; 841{ 842 struct msghdr msg; 843 struct iovec aiov; 844 int error; 845 846 if (uap->fromlenaddr) { 847 error = copyin((caddr_t)uap->fromlenaddr, 848 (caddr_t)&msg.msg_namelen, sizeof (msg.msg_namelen)); 849 if (error) 850 return (error); 851 } else 852 msg.msg_namelen = 0; 853 msg.msg_name = uap->from; 854 msg.msg_iov = &aiov; 855 msg.msg_iovlen = 1; 856 aiov.iov_base = uap->buf; 857 aiov.iov_len = uap->len; 858 msg.msg_control = 0; 859 msg.msg_flags = uap->flags; 860 return (recvit(p, uap->s, &msg, (caddr_t)uap->fromlenaddr)); 861} 862 863#ifdef COMPAT_OLDSOCK 864int 865orecvfrom(p, uap) 866 struct proc *p; 867 struct recvfrom_args *uap; 868{ 869 870 uap->flags |= MSG_COMPAT; 871 return (recvfrom(p, uap)); 872} 873#endif 874 875 876#ifdef COMPAT_OLDSOCK 877int 878orecv(p, uap) 879 struct proc *p; 880 register struct orecv_args /* { 881 int s; 882 caddr_t buf; 883 int len; 884 int flags; 885 } */ *uap; 886{ 887 struct msghdr msg; 888 struct iovec aiov; 889 890 msg.msg_name = 0; 891 msg.msg_namelen = 0; 892 msg.msg_iov = &aiov; 893 msg.msg_iovlen = 1; 894 aiov.iov_base = uap->buf; 895 aiov.iov_len = uap->len; 896 msg.msg_control = 0; 897 msg.msg_flags = uap->flags; 898 return (recvit(p, uap->s, &msg, (caddr_t)0)); 899} 900 901/* 902 * Old recvmsg. This code takes advantage of the fact that the old msghdr 903 * overlays the new one, missing only the flags, and with the (old) access 904 * rights where the control fields are now. 905 */ 906int 907orecvmsg(p, uap) 908 struct proc *p; 909 register struct orecvmsg_args /* { 910 int s; 911 struct omsghdr *msg; 912 int flags; 913 } */ *uap; 914{ 915 struct msghdr msg; 916 struct iovec aiov[UIO_SMALLIOV], *iov; 917 int error; 918 919 error = copyin((caddr_t)uap->msg, (caddr_t)&msg, 920 sizeof (struct omsghdr)); 921 if (error) 922 return (error); 923 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 924 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) 925 return (EMSGSIZE); 926 MALLOC(iov, struct iovec *, 927 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 928 M_WAITOK); 929 } else 930 iov = aiov; 931 msg.msg_flags = uap->flags | MSG_COMPAT; 932 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 933 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 934 if (error) 935 goto done; 936 msg.msg_iov = iov; 937 error = recvit(p, uap->s, &msg, (caddr_t)&uap->msg->msg_namelen); 938 939 if (msg.msg_controllen && error == 0) 940 error = copyout((caddr_t)&msg.msg_controllen, 941 (caddr_t)&uap->msg->msg_accrightslen, sizeof (int)); 942done: 943 if (iov != aiov) 944 FREE(iov, M_IOV); 945 return (error); 946} 947#endif 948 949int 950recvmsg(p, uap) 951 struct proc *p; 952 register struct recvmsg_args /* { 953 int s; 954 struct msghdr *msg; 955 int flags; 956 } */ *uap; 957{ 958 struct msghdr msg; 959 struct iovec aiov[UIO_SMALLIOV], *uiov, *iov; 960 register int error; 961 962 error = copyin((caddr_t)uap->msg, (caddr_t)&msg, sizeof (msg)); 963 if (error) 964 return (error); 965 if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) { 966 if ((u_int)msg.msg_iovlen >= UIO_MAXIOV) 967 return (EMSGSIZE); 968 MALLOC(iov, struct iovec *, 969 sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 970 M_WAITOK); 971 } else 972 iov = aiov; 973#ifdef COMPAT_OLDSOCK 974 msg.msg_flags = uap->flags &~ MSG_COMPAT; 975#else 976 msg.msg_flags = uap->flags; 977#endif 978 uiov = msg.msg_iov; 979 msg.msg_iov = iov; 980 error = copyin((caddr_t)uiov, (caddr_t)iov, 981 (unsigned)(msg.msg_iovlen * sizeof (struct iovec))); 982 if (error) 983 goto done; 984 error = recvit(p, uap->s, &msg, (caddr_t)0); 985 if (!error) { 986 msg.msg_iov = uiov; 987 error = copyout((caddr_t)&msg, (caddr_t)uap->msg, sizeof(msg)); 988 } 989done: 990 if (iov != aiov) 991 FREE(iov, M_IOV); 992 return (error); 993} 994 995/* ARGSUSED */ 996int 997shutdown(p, uap) 998 struct proc *p; 999 register struct shutdown_args /* { 1000 int s; 1001 int how; 1002 } */ *uap; 1003{ 1004 struct file *fp; 1005 int error; 1006 1007 error = getsock(p->p_fd, uap->s, &fp); 1008 if (error) 1009 return (error); 1010 return (soshutdown((struct socket *)fp->f_data, uap->how)); 1011} 1012 1013/* ARGSUSED */ 1014int 1015setsockopt(p, uap) 1016 struct proc *p; 1017 register struct setsockopt_args /* { 1018 int s; 1019 int level; 1020 int name; 1021 caddr_t val; 1022 int valsize; 1023 } */ *uap; 1024{ 1025 struct file *fp; 1026 struct sockopt sopt; 1027 int error; 1028 1029 if (uap->val == 0 && uap->valsize != 0) 1030 return (EFAULT); 1031 if (uap->valsize < 0) 1032 return (EINVAL); 1033 1034 error = getsock(p->p_fd, uap->s, &fp); 1035 if (error) 1036 return (error); 1037 1038 sopt.sopt_dir = SOPT_SET; 1039 sopt.sopt_level = uap->level; 1040 sopt.sopt_name = uap->name; 1041 sopt.sopt_val = uap->val; 1042 sopt.sopt_valsize = uap->valsize; 1043 sopt.sopt_p = p; 1044 1045 return (sosetopt((struct socket *)fp->f_data, &sopt)); 1046} 1047 1048/* ARGSUSED */ 1049int 1050getsockopt(p, uap) 1051 struct proc *p; 1052 register struct getsockopt_args /* { 1053 int s; 1054 int level; 1055 int name; 1056 caddr_t val; 1057 int *avalsize; 1058 } */ *uap; 1059{ 1060 int valsize, error; 1061 struct file *fp; 1062 struct sockopt sopt; 1063 1064 error = getsock(p->p_fd, uap->s, &fp); 1065 if (error) 1066 return (error); 1067 if (uap->val) { 1068 error = copyin((caddr_t)uap->avalsize, (caddr_t)&valsize, 1069 sizeof (valsize)); 1070 if (error) 1071 return (error); 1072 if (valsize < 0) 1073 return (EINVAL); 1074 } else 1075 valsize = 0; 1076 1077 sopt.sopt_dir = SOPT_GET; 1078 sopt.sopt_level = uap->level; 1079 sopt.sopt_name = uap->name; 1080 sopt.sopt_val = uap->val; 1081 sopt.sopt_valsize = (size_t)valsize; /* checked non-negative above */ 1082 sopt.sopt_p = p; 1083 1084 error = sogetopt((struct socket *)fp->f_data, &sopt); 1085 if (error == 0) { 1086 valsize = sopt.sopt_valsize; 1087 error = copyout((caddr_t)&valsize, 1088 (caddr_t)uap->avalsize, sizeof (valsize)); 1089 } 1090 return (error); 1091} 1092 1093/* 1094 * Get socket name. 1095 */ 1096/* ARGSUSED */ 1097static int 1098getsockname1(p, uap, compat) 1099 struct proc *p; 1100 register struct getsockname_args /* { 1101 int fdes; 1102 caddr_t asa; 1103 int *alen; 1104 } */ *uap; 1105 int compat; 1106{ 1107 struct file *fp; 1108 register struct socket *so; 1109 struct sockaddr *sa; 1110 int len, error; 1111 1112 error = getsock(p->p_fd, uap->fdes, &fp); 1113 if (error) 1114 return (error); 1115 error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len)); 1116 if (error) 1117 return (error); 1118 so = (struct socket *)fp->f_data; 1119 sa = 0; 1120 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa); 1121 if (error) 1122 goto bad; 1123 if (sa == 0) { 1124 len = 0; 1125 goto gotnothing; 1126 } 1127 1128 len = MIN(len, sa->sa_len); 1129#ifdef COMPAT_OLDSOCK 1130 if (compat) 1131 ((struct osockaddr *)sa)->sa_family = sa->sa_family; 1132#endif 1133 error = copyout(sa, (caddr_t)uap->asa, (u_int)len); 1134 if (error == 0) 1135gotnothing: 1136 error = copyout((caddr_t)&len, (caddr_t)uap->alen, 1137 sizeof (len)); 1138bad: 1139 if (sa) 1140 FREE(sa, M_SONAME); 1141 return (error); 1142} 1143 1144int 1145getsockname(p, uap) 1146 struct proc *p; 1147 struct getsockname_args *uap; 1148{ 1149 1150 return (getsockname1(p, uap, 0)); 1151} 1152 1153#ifdef COMPAT_OLDSOCK 1154int 1155ogetsockname(p, uap) 1156 struct proc *p; 1157 struct getsockname_args *uap; 1158{ 1159 1160 return (getsockname1(p, uap, 1)); 1161} 1162#endif /* COMPAT_OLDSOCK */ 1163 1164/* 1165 * Get name of peer for connected socket. 1166 */ 1167/* ARGSUSED */ 1168static int 1169getpeername1(p, uap, compat) 1170 struct proc *p; 1171 register struct getpeername_args /* { 1172 int fdes; 1173 caddr_t asa; 1174 int *alen; 1175 } */ *uap; 1176 int compat; 1177{ 1178 struct file *fp; 1179 register struct socket *so; 1180 struct sockaddr *sa; 1181 int len, error; 1182 1183 error = getsock(p->p_fd, uap->fdes, &fp); 1184 if (error) 1185 return (error); 1186 so = (struct socket *)fp->f_data; 1187 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) 1188 return (ENOTCONN); 1189 error = copyin((caddr_t)uap->alen, (caddr_t)&len, sizeof (len)); 1190 if (error) 1191 return (error); 1192 sa = 0; 1193 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, &sa); 1194 if (error) 1195 goto bad; 1196 if (sa == 0) { 1197 len = 0; 1198 goto gotnothing; 1199 } 1200 len = MIN(len, sa->sa_len); 1201#ifdef COMPAT_OLDSOCK 1202 if (compat) 1203 ((struct osockaddr *)sa)->sa_family = 1204 sa->sa_family; 1205#endif 1206 error = copyout(sa, (caddr_t)uap->asa, (u_int)len); 1207 if (error) 1208 goto bad; 1209gotnothing: 1210 error = copyout((caddr_t)&len, (caddr_t)uap->alen, sizeof (len)); 1211bad: 1212 if (sa) FREE(sa, M_SONAME); 1213 return (error); 1214} 1215 1216int 1217getpeername(p, uap) 1218 struct proc *p; 1219 struct getpeername_args *uap; 1220{ 1221 1222 return (getpeername1(p, uap, 0)); 1223} 1224 1225#ifdef COMPAT_OLDSOCK 1226int 1227ogetpeername(p, uap) 1228 struct proc *p; 1229 struct ogetpeername_args *uap; 1230{ 1231 1232 /* XXX uap should have type `getpeername_args *' to begin with. */ 1233 return (getpeername1(p, (struct getpeername_args *)uap, 1)); 1234} 1235#endif /* COMPAT_OLDSOCK */ 1236 1237int 1238sockargs(mp, buf, buflen, type) 1239 struct mbuf **mp; 1240 caddr_t buf; 1241 int buflen, type; 1242{ 1243 register struct sockaddr *sa; 1244 register struct mbuf *m; 1245 int error; 1246 1247 if ((u_int)buflen > MLEN) { 1248#ifdef COMPAT_OLDSOCK 1249 if (type == MT_SONAME && (u_int)buflen <= 112) 1250 buflen = MLEN; /* unix domain compat. hack */ 1251 else 1252#endif 1253 return (EINVAL); 1254 } 1255 m = m_get(M_WAIT, type); 1256 if (m == NULL) 1257 return (ENOBUFS); 1258 m->m_len = buflen; 1259 error = copyin(buf, mtod(m, caddr_t), (u_int)buflen); 1260 if (error) 1261 (void) m_free(m); 1262 else { 1263 *mp = m; 1264 if (type == MT_SONAME) { 1265 sa = mtod(m, struct sockaddr *); 1266 1267#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1268 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1269 sa->sa_family = sa->sa_len; 1270#endif 1271 sa->sa_len = buflen; 1272 } 1273 } 1274 return (error); 1275} 1276 1277int 1278getsockaddr(namp, uaddr, len) 1279 struct sockaddr **namp; 1280 caddr_t uaddr; 1281 size_t len; 1282{ 1283 struct sockaddr *sa; 1284 int error; 1285 1286 if (len > SOCK_MAXADDRLEN) 1287 return ENAMETOOLONG; 1288 MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK); 1289 error = copyin(uaddr, sa, len); 1290 if (error) { 1291 FREE(sa, M_SONAME); 1292 } else { 1293#if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1294 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1295 sa->sa_family = sa->sa_len; 1296#endif 1297 sa->sa_len = len; 1298 *namp = sa; 1299 } 1300 return error; 1301} 1302 1303int 1304getsock(fdp, fdes, fpp) 1305 struct filedesc *fdp; 1306 int fdes; 1307 struct file **fpp; 1308{ 1309 register struct file *fp; 1310 1311 if ((unsigned)fdes >= fdp->fd_nfiles || 1312 (fp = fdp->fd_ofiles[fdes]) == NULL) 1313 return (EBADF); 1314 if (fp->f_type != DTYPE_SOCKET) 1315 return (ENOTSOCK); 1316 *fpp = fp; 1317 return (0); 1318} 1319 1320/* 1321 * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-)) 1322 * XXX - The sf_buf functions are currently private to sendfile(2), so have 1323 * been made static, but may be useful in the future for doing zero-copy in 1324 * other parts of the networking code. 1325 */ 1326static void 1327sf_buf_init(void *arg) 1328{ 1329 int i; 1330 1331 SLIST_INIT(&sf_freelist); 1332 sf_base = kmem_alloc_pageable(kernel_map, nsfbufs * PAGE_SIZE); 1333 sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, M_NOWAIT); 1334 bzero(sf_bufs, nsfbufs * sizeof(struct sf_buf)); 1335 for (i = 0; i < nsfbufs; i++) { 1336 sf_bufs[i].kva = sf_base + i * PAGE_SIZE; 1337 SLIST_INSERT_HEAD(&sf_freelist, &sf_bufs[i], free_list); 1338 } 1339} 1340 1341/* 1342 * Get an sf_buf from the freelist. Will block if none are available. 1343 */ 1344static struct sf_buf * 1345sf_buf_alloc() 1346{ 1347 struct sf_buf *sf; 1348 int s; 1349 1350 s = splimp(); 1351 while ((sf = SLIST_FIRST(&sf_freelist)) == NULL) { 1352 sf_buf_alloc_want = 1; 1353 tsleep(&sf_freelist, PVM, "sfbufa", 0); 1354 } 1355 SLIST_REMOVE_HEAD(&sf_freelist, free_list); 1356 splx(s); 1357 sf->refcnt = 1; 1358 return (sf); 1359} 1360 1361#define dtosf(x) (&sf_bufs[((uintptr_t)(x) - (uintptr_t)sf_base) >> PAGE_SHIFT]) 1362static void 1363sf_buf_ref(caddr_t addr, u_int size) 1364{ 1365 struct sf_buf *sf; 1366 1367 sf = dtosf(addr); 1368 if (sf->refcnt == 0) 1369 panic("sf_buf_ref: referencing a free sf_buf"); 1370 sf->refcnt++; 1371} 1372 1373/* 1374 * Lose a reference to an sf_buf. When none left, detach mapped page 1375 * and release resources back to the system. 1376 * 1377 * Must be called at splimp. 1378 */ 1379static void 1380sf_buf_free(caddr_t addr, u_int size) 1381{ 1382 struct sf_buf *sf; 1383 struct vm_page *m; 1384 int s; 1385 1386 sf = dtosf(addr); 1387 if (sf->refcnt == 0) 1388 panic("sf_buf_free: freeing free sf_buf"); 1389 sf->refcnt--; 1390 if (sf->refcnt == 0) { 1391 pmap_qremove((vm_offset_t)addr, 1); 1392 m = sf->m; 1393 s = splvm(); 1394 vm_page_unwire(m, 0); 1395 /* 1396 * Check for the object going away on us. This can 1397 * happen since we don't hold a reference to it. 1398 * If so, we're responsible for freeing the page. 1399 */ 1400 if (m->wire_count == 0 && m->object == NULL) 1401 vm_page_free(m); 1402 splx(s); 1403 sf->m = NULL; 1404 SLIST_INSERT_HEAD(&sf_freelist, sf, free_list); 1405 if (sf_buf_alloc_want) { 1406 sf_buf_alloc_want = 0; 1407 wakeup(&sf_freelist); 1408 } 1409 } 1410} 1411 1412/* 1413 * sendfile(2). 1414 * int sendfile(int fd, int s, off_t offset, size_t nbytes, 1415 * struct sf_hdtr *hdtr, off_t *sbytes, int flags) 1416 * 1417 * Send a file specified by 'fd' and starting at 'offset' to a socket 1418 * specified by 's'. Send only 'nbytes' of the file or until EOF if 1419 * nbytes == 0. Optionally add a header and/or trailer to the socket 1420 * output. If specified, write the total number of bytes sent into *sbytes. 1421 */ 1422int 1423sendfile(struct proc *p, struct sendfile_args *uap) 1424{ 1425 struct file *fp; 1426 struct filedesc *fdp = p->p_fd; 1427 struct vnode *vp; 1428 struct vm_object *obj; 1429 struct socket *so; 1430 struct mbuf *m; 1431 struct sf_buf *sf; 1432 struct vm_page *pg; 1433 struct writev_args nuap; 1434 struct sf_hdtr hdtr; 1435 off_t off, xfsize, sbytes = 0; 1436 int error = 0, s; 1437 1438 vp = NULL; 1439 /* 1440 * Do argument checking. Must be a regular file in, stream 1441 * type and connected socket out, positive offset. 1442 */ 1443 fp = getfp(fdp, uap->fd, FREAD); 1444 if (fp == NULL) { 1445 error = EBADF; 1446 goto done; 1447 } 1448 if (fp->f_type != DTYPE_VNODE) { 1449 error = EINVAL; 1450 goto done; 1451 } 1452 vp = (struct vnode *)fp->f_data; 1453 vref(vp); 1454 obj = vp->v_object; 1455 if (vp->v_type != VREG || obj == NULL) { 1456 error = EINVAL; 1457 goto done; 1458 } 1459 error = getsock(p->p_fd, uap->s, &fp); 1460 if (error) 1461 goto done; 1462 so = (struct socket *)fp->f_data; 1463 if (so->so_type != SOCK_STREAM) { 1464 error = EINVAL; 1465 goto done; 1466 } 1467 if ((so->so_state & SS_ISCONNECTED) == 0) { 1468 error = ENOTCONN; 1469 goto done; 1470 } 1471 if (uap->offset < 0) { 1472 error = EINVAL; 1473 goto done; 1474 } 1475 1476 /* 1477 * If specified, get the pointer to the sf_hdtr struct for 1478 * any headers/trailers. 1479 */ 1480 if (uap->hdtr != NULL) { 1481 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); 1482 if (error) 1483 goto done; 1484 /* 1485 * Send any headers. Wimp out and use writev(2). 1486 */ 1487 if (hdtr.headers != NULL) { 1488 nuap.fd = uap->s; 1489 nuap.iovp = hdtr.headers; 1490 nuap.iovcnt = hdtr.hdr_cnt; 1491 error = writev(p, &nuap); 1492 if (error) 1493 goto done; 1494 sbytes += p->p_retval[0]; 1495 } 1496 } 1497 1498 /* 1499 * Protect against multiple writers to the socket. 1500 */ 1501 (void) sblock(&so->so_snd, M_WAITOK); 1502 1503 /* 1504 * Loop through the pages in the file, starting with the requested 1505 * offset. Get a file page (do I/O if necessary), map the file page 1506 * into an sf_buf, attach an mbuf header to the sf_buf, and queue 1507 * it on the socket. 1508 */ 1509 for (off = uap->offset; ; off += xfsize, sbytes += xfsize) { 1510 vm_pindex_t pindex; 1511 vm_offset_t pgoff; 1512 1513 pindex = OFF_TO_IDX(off); 1514retry_lookup: 1515 /* 1516 * Calculate the amount to transfer. Not to exceed a page, 1517 * the EOF, or the passed in nbytes. 1518 */ 1519 xfsize = obj->un_pager.vnp.vnp_size - off; 1520 if (xfsize > PAGE_SIZE) 1521 xfsize = PAGE_SIZE; 1522 pgoff = (vm_offset_t)(off & PAGE_MASK); 1523 if (PAGE_SIZE - pgoff < xfsize) 1524 xfsize = PAGE_SIZE - pgoff; 1525 if (uap->nbytes && xfsize > (uap->nbytes - sbytes)) 1526 xfsize = uap->nbytes - sbytes; 1527 if (xfsize <= 0) 1528 break; 1529 /* 1530 * Optimize the non-blocking case by looking at the socket space 1531 * before going to the extra work of constituting the sf_buf. 1532 */ 1533 if ((so->so_state & SS_NBIO) && sbspace(&so->so_snd) <= 0) { 1534 if (so->so_state & SS_CANTSENDMORE) 1535 error = EPIPE; 1536 else 1537 error = EAGAIN; 1538 sbunlock(&so->so_snd); 1539 goto done; 1540 } 1541 /* 1542 * Attempt to look up the page. 1543 * 1544 * Allocate if not found 1545 * 1546 * Wait and loop if busy. 1547 */ 1548 pg = vm_page_lookup(obj, pindex); 1549 1550 if (pg == NULL) { 1551 pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL); 1552 if (pg == NULL) { 1553 VM_WAIT; 1554 goto retry_lookup; 1555 } 1556 vm_page_wakeup(pg); 1557 } else if (vm_page_sleep_busy(pg, TRUE, "sfpbsy")) { 1558 goto retry_lookup; 1559 } 1560 1561 /* 1562 * Wire the page so it does not get ripped out from under 1563 * us. 1564 */ 1565 1566 vm_page_wire(pg); 1567 1568 /* 1569 * If page is not valid for what we need, initiate I/O 1570 */ 1571 1572 if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) { 1573 struct uio auio; 1574 struct iovec aiov; 1575 int bsize; 1576 1577 /* 1578 * Ensure that our page is still around when the I/O 1579 * completes. 1580 */ 1581 vm_page_io_start(pg); 1582 1583 /* 1584 * Get the page from backing store. 1585 */ 1586 bsize = vp->v_mount->mnt_stat.f_iosize; 1587 auio.uio_iov = &aiov; 1588 auio.uio_iovcnt = 1; 1589 aiov.iov_base = 0; 1590 aiov.iov_len = MAXBSIZE; 1591 auio.uio_resid = MAXBSIZE; 1592 auio.uio_offset = trunc_page(off); 1593 auio.uio_segflg = UIO_NOCOPY; 1594 auio.uio_rw = UIO_READ; 1595 auio.uio_procp = p; 1596 vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, p); 1597 error = VOP_READ(vp, &auio, IO_VMIO | ((MAXBSIZE / bsize) << 16), 1598 p->p_ucred); 1599 VOP_UNLOCK(vp, 0, p); 1600 vm_page_flag_clear(pg, PG_ZERO); 1601 vm_page_io_finish(pg); 1602 if (error) { 1603 vm_page_unwire(pg, 0); 1604 /* 1605 * See if anyone else might know about this page. 1606 * If not and it is not valid, then free it. 1607 */ 1608 if (pg->wire_count == 0 && pg->valid == 0 && 1609 pg->busy == 0 && !(pg->flags & PG_BUSY) && 1610 pg->hold_count == 0) 1611 vm_page_free(pg); 1612 sbunlock(&so->so_snd); 1613 goto done; 1614 } 1615 } 1616 1617 /* 1618 * Allocate a kernel virtual page and insert the physical page 1619 * into it. 1620 */ 1621 1622 sf = sf_buf_alloc(); 1623 sf->m = pg; 1624 pmap_qenter(sf->kva, &pg, 1); 1625 /* 1626 * Get an mbuf header and set it up as having external storage. 1627 */ 1628 MGETHDR(m, M_WAIT, MT_DATA); 1629 if (m == NULL) { 1630 error = ENOBUFS; 1631 goto done; 1632 } 1633 m->m_ext.ext_free = sf_buf_free; 1634 m->m_ext.ext_ref = sf_buf_ref; 1635 m->m_ext.ext_buf = (void *)sf->kva; 1636 m->m_ext.ext_size = PAGE_SIZE; 1637 m->m_data = (char *) sf->kva + pgoff; 1638 m->m_flags |= M_EXT; 1639 m->m_pkthdr.len = m->m_len = xfsize; 1640 /* 1641 * Add the buffer to the socket buffer chain. 1642 */ 1643 s = splnet(); 1644retry_space: 1645 /* 1646 * Make sure that the socket is still able to take more data. 1647 * CANTSENDMORE being true usually means that the connection 1648 * was closed. so_error is true when an error was sensed after 1649 * a previous send. 1650 * The state is checked after the page mapping and buffer 1651 * allocation above since those operations may block and make 1652 * any socket checks stale. From this point forward, nothing 1653 * blocks before the pru_send (or more accurately, any blocking 1654 * results in a loop back to here to re-check). 1655 */ 1656 if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { 1657 if (so->so_state & SS_CANTSENDMORE) { 1658 error = EPIPE; 1659 } else { 1660 error = so->so_error; 1661 so->so_error = 0; 1662 } 1663 m_freem(m); 1664 sbunlock(&so->so_snd); 1665 splx(s); 1666 goto done; 1667 } 1668 /* 1669 * Wait for socket space to become available. We do this just 1670 * after checking the connection state above in order to avoid 1671 * a race condition with sbwait(). 1672 */ 1673 if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) { 1674 if (so->so_state & SS_NBIO) { 1675 m_freem(m); 1676 sbunlock(&so->so_snd); 1677 splx(s); 1678 error = EAGAIN; 1679 goto done; 1680 } 1681 error = sbwait(&so->so_snd); 1682 /* 1683 * An error from sbwait usually indicates that we've 1684 * been interrupted by a signal. If we've sent anything 1685 * then return bytes sent, otherwise return the error. 1686 */ 1687 if (error) { 1688 m_freem(m); 1689 sbunlock(&so->so_snd); 1690 splx(s); 1691 goto done; 1692 } 1693 goto retry_space; 1694 } 1695 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, 0, 0, p); 1696 splx(s); 1697 if (error) { 1698 sbunlock(&so->so_snd); 1699 goto done; 1700 } 1701 } 1702 sbunlock(&so->so_snd); 1703 1704 /* 1705 * Send trailers. Wimp out and use writev(2). 1706 */ 1707 if (uap->hdtr != NULL && hdtr.trailers != NULL) { 1708 nuap.fd = uap->s; 1709 nuap.iovp = hdtr.trailers; 1710 nuap.iovcnt = hdtr.trl_cnt; 1711 error = writev(p, &nuap); 1712 if (error) 1713 goto done; 1714 sbytes += p->p_retval[0]; 1715 } 1716 1717done: 1718 if (uap->sbytes != NULL) { 1719 copyout(&sbytes, uap->sbytes, sizeof(off_t)); 1720 } 1721 if (vp) 1722 vrele(vp); 1723 return (error); 1724} 1725