Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/kern/uipc_syscalls.c
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1 /* $NetBSD: uipc_syscalls.c,v 1.86.2.3 2006/10/29 13:03:51 tron Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)uipc_syscalls.c 8.6 (Berkeley) 2/14/95 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: uipc_syscalls.c,v 1.86.2.3 2006/10/29 13:03:51 tron Exp $"); 36 37 #include "opt_ktrace.h" 38 #include "opt_pipe.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/filedesc.h> 43 #include <sys/proc.h> 44 #include <sys/file.h> 45 #include <sys/buf.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/signalvar.h> 52 #include <sys/un.h> 53 #ifdef KTRACE 54 #include <sys/ktrace.h> 55 #endif 56 #include <sys/event.h> 57 58 #include <sys/mount.h> 59 #include <sys/sa.h> 60 #include <sys/syscallargs.h> 61 62 #include <uvm/uvm_extern.h> 63 64 /* 65 * System call interface to the socket abstraction. 66 */ 67 extern struct fileops socketops; 68 69 int 70 sys_socket(struct lwp *l, void *v, register_t *retval) 71 { 72 struct sys_socket_args /* { 73 syscallarg(int) domain; 74 syscallarg(int) type; 75 syscallarg(int) protocol; 76 } */ *uap = v; 77 78 struct proc *p; 79 struct filedesc *fdp; 80 struct socket *so; 81 struct file *fp; 82 int fd, error; 83 84 p = l->l_proc; 85 fdp = p->p_fd; 86 /* falloc() will use the desciptor for us */ 87 if ((error = falloc(p, &fp, &fd)) != 0) 88 return (error); 89 fp->f_flag = FREAD|FWRITE; 90 fp->f_type = DTYPE_SOCKET; 91 fp->f_ops = &socketops; 92 error = socreate(SCARG(uap, domain), &so, SCARG(uap, type), 93 SCARG(uap, protocol)); 94 if (error) { 95 FILE_UNUSE(fp, p); 96 fdremove(fdp, fd); 97 ffree(fp); 98 } else { 99 fp->f_data = (caddr_t)so; 100 FILE_SET_MATURE(fp); 101 FILE_UNUSE(fp, p); 102 *retval = fd; 103 } 104 return (error); 105 } 106 107 /* ARGSUSED */ 108 int 109 sys_bind(struct lwp *l, void *v, register_t *retval) 110 { 111 struct sys_bind_args /* { 112 syscallarg(int) s; 113 syscallarg(const struct sockaddr *) name; 114 syscallarg(unsigned int) namelen; 115 } */ *uap = v; 116 struct proc *p; 117 struct file *fp; 118 struct mbuf *nam; 119 int error; 120 121 p = l->l_proc; 122 /* getsock() will use the descriptor for us */ 123 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 124 return (error); 125 error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen), 126 MT_SONAME); 127 if (error) { 128 FILE_UNUSE(fp, p); 129 return (error); 130 } 131 MCLAIM(nam, ((struct socket *)fp->f_data)->so_mowner); 132 error = sobind((struct socket *)fp->f_data, nam, p); 133 m_freem(nam); 134 FILE_UNUSE(fp, p); 135 return (error); 136 } 137 138 /* ARGSUSED */ 139 int 140 sys_listen(struct lwp *l, void *v, register_t *retval) 141 { 142 struct sys_listen_args /* { 143 syscallarg(int) s; 144 syscallarg(int) backlog; 145 } */ *uap = v; 146 struct proc *p; 147 struct file *fp; 148 int error; 149 150 p = l->l_proc; 151 /* getsock() will use the descriptor for us */ 152 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 153 return (error); 154 error = solisten((struct socket *)fp->f_data, SCARG(uap, backlog)); 155 FILE_UNUSE(fp, p); 156 return (error); 157 } 158 159 int 160 sys_accept(struct lwp *l, void *v, register_t *retval) 161 { 162 struct sys_accept_args /* { 163 syscallarg(int) s; 164 syscallarg(struct sockaddr *) name; 165 syscallarg(unsigned int *) anamelen; 166 } */ *uap = v; 167 struct proc *p; 168 struct filedesc *fdp; 169 struct file *fp; 170 struct mbuf *nam; 171 unsigned int namelen; 172 int error, s, fd; 173 struct socket *so; 174 int fflag; 175 176 p = l->l_proc; 177 fdp = p->p_fd; 178 if (SCARG(uap, name) && (error = copyin(SCARG(uap, anamelen), 179 &namelen, sizeof(namelen)))) 180 return (error); 181 182 /* getsock() will use the descriptor for us */ 183 if ((error = getsock(fdp, SCARG(uap, s), &fp)) != 0) 184 return (error); 185 s = splsoftnet(); 186 so = (struct socket *)fp->f_data; 187 FILE_UNUSE(fp, p); 188 if (!(so->so_proto->pr_flags & PR_LISTEN)) { 189 splx(s); 190 return (EOPNOTSUPP); 191 } 192 if ((so->so_options & SO_ACCEPTCONN) == 0) { 193 splx(s); 194 return (EINVAL); 195 } 196 if ((so->so_state & SS_NBIO) && so->so_qlen == 0) { 197 splx(s); 198 return (EWOULDBLOCK); 199 } 200 while (so->so_qlen == 0 && so->so_error == 0) { 201 if (so->so_state & SS_CANTRCVMORE) { 202 so->so_error = ECONNABORTED; 203 break; 204 } 205 error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, 206 netcon, 0); 207 if (error) { 208 splx(s); 209 return (error); 210 } 211 } 212 if (so->so_error) { 213 error = so->so_error; 214 so->so_error = 0; 215 splx(s); 216 return (error); 217 } 218 fflag = fp->f_flag; 219 /* falloc() will use the descriptor for us */ 220 if ((error = falloc(p, &fp, &fd)) != 0) { 221 splx(s); 222 return (error); 223 } 224 *retval = fd; 225 226 /* connection has been removed from the listen queue */ 227 KNOTE(&so->so_rcv.sb_sel.sel_klist, 0); 228 229 { struct socket *aso = TAILQ_FIRST(&so->so_q); 230 if (soqremque(aso, 1) == 0) 231 panic("accept"); 232 so = aso; 233 } 234 fp->f_type = DTYPE_SOCKET; 235 fp->f_flag = fflag; 236 fp->f_ops = &socketops; 237 fp->f_data = (caddr_t)so; 238 FILE_UNUSE(fp, p); 239 nam = m_get(M_WAIT, MT_SONAME); 240 if ((error = soaccept(so, nam)) == 0 && SCARG(uap, name)) { 241 if (namelen > nam->m_len) 242 namelen = nam->m_len; 243 /* SHOULD COPY OUT A CHAIN HERE */ 244 if ((error = copyout(mtod(nam, caddr_t), 245 (caddr_t)SCARG(uap, name), namelen)) != 0 || 246 (error = copyout((caddr_t)&namelen, 247 (caddr_t)SCARG(uap, anamelen), 248 sizeof(*SCARG(uap, anamelen)))) != 0) { 249 soclose(so); 250 } 251 } 252 /* if an error occurred, free the file descriptor */ 253 if (error) { 254 fdremove(fdp, fd); 255 ffree(fp); 256 } 257 m_freem(nam); 258 splx(s); 259 FILE_SET_MATURE(fp); 260 return (error); 261 } 262 263 /* ARGSUSED */ 264 int 265 sys_connect(struct lwp *l, void *v, register_t *retval) 266 { 267 struct sys_connect_args /* { 268 syscallarg(int) s; 269 syscallarg(const struct sockaddr *) name; 270 syscallarg(unsigned int) namelen; 271 } */ *uap = v; 272 struct proc *p; 273 struct file *fp; 274 struct socket *so; 275 struct mbuf *nam; 276 int error, s; 277 int interrupted = 0; 278 279 p = l->l_proc; 280 /* getsock() will use the descriptor for us */ 281 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 282 return (error); 283 so = (struct socket *)fp->f_data; 284 if (so->so_state & SS_ISCONNECTING) { 285 error = EALREADY; 286 goto out; 287 } 288 error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen), 289 MT_SONAME); 290 if (error) 291 goto out; 292 MCLAIM(nam, so->so_mowner); 293 error = soconnect(so, nam); 294 if (error) 295 goto bad; 296 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 297 m_freem(nam); 298 error = EINPROGRESS; 299 goto out; 300 } 301 s = splsoftnet(); 302 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 303 error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, 304 netcon, 0); 305 if (error) { 306 if (error == EINTR || error == ERESTART) 307 interrupted = 1; 308 break; 309 } 310 } 311 if (error == 0) { 312 error = so->so_error; 313 so->so_error = 0; 314 } 315 splx(s); 316 bad: 317 if (!interrupted) 318 so->so_state &= ~SS_ISCONNECTING; 319 m_freem(nam); 320 if (error == ERESTART) 321 error = EINTR; 322 out: 323 FILE_UNUSE(fp, p); 324 return (error); 325 } 326 327 int 328 sys_socketpair(struct lwp *l, void *v, register_t *retval) 329 { 330 struct sys_socketpair_args /* { 331 syscallarg(int) domain; 332 syscallarg(int) type; 333 syscallarg(int) protocol; 334 syscallarg(int *) rsv; 335 } */ *uap = v; 336 struct proc *p; 337 struct filedesc *fdp; 338 struct file *fp1, *fp2; 339 struct socket *so1, *so2; 340 int fd, error, sv[2]; 341 342 p = l->l_proc; 343 fdp = p->p_fd; 344 error = socreate(SCARG(uap, domain), &so1, SCARG(uap, type), 345 SCARG(uap, protocol)); 346 if (error) 347 return (error); 348 error = socreate(SCARG(uap, domain), &so2, SCARG(uap, type), 349 SCARG(uap, protocol)); 350 if (error) 351 goto free1; 352 /* falloc() will use the descriptor for us */ 353 if ((error = falloc(p, &fp1, &fd)) != 0) 354 goto free2; 355 sv[0] = fd; 356 fp1->f_flag = FREAD|FWRITE; 357 fp1->f_type = DTYPE_SOCKET; 358 fp1->f_ops = &socketops; 359 fp1->f_data = (caddr_t)so1; 360 if ((error = falloc(p, &fp2, &fd)) != 0) 361 goto free3; 362 fp2->f_flag = FREAD|FWRITE; 363 fp2->f_type = DTYPE_SOCKET; 364 fp2->f_ops = &socketops; 365 fp2->f_data = (caddr_t)so2; 366 sv[1] = fd; 367 if ((error = soconnect2(so1, so2)) != 0) 368 goto free4; 369 if (SCARG(uap, type) == SOCK_DGRAM) { 370 /* 371 * Datagram socket connection is asymmetric. 372 */ 373 if ((error = soconnect2(so2, so1)) != 0) 374 goto free4; 375 } 376 error = copyout((caddr_t)sv, (caddr_t)SCARG(uap, rsv), 377 2 * sizeof(int)); 378 FILE_SET_MATURE(fp1); 379 FILE_SET_MATURE(fp2); 380 FILE_UNUSE(fp1, p); 381 FILE_UNUSE(fp2, p); 382 return (error); 383 free4: 384 FILE_UNUSE(fp2, p); 385 ffree(fp2); 386 fdremove(fdp, sv[1]); 387 free3: 388 FILE_UNUSE(fp1, p); 389 ffree(fp1); 390 fdremove(fdp, sv[0]); 391 free2: 392 (void)soclose(so2); 393 free1: 394 (void)soclose(so1); 395 return (error); 396 } 397 398 int 399 sys_sendto(struct lwp *l, void *v, register_t *retval) 400 { 401 struct sys_sendto_args /* { 402 syscallarg(int) s; 403 syscallarg(const void *) buf; 404 syscallarg(size_t) len; 405 syscallarg(int) flags; 406 syscallarg(const struct sockaddr *) to; 407 syscallarg(unsigned int) tolen; 408 } */ *uap = v; 409 struct proc *p; 410 struct msghdr msg; 411 struct iovec aiov; 412 413 p = l->l_proc; 414 msg.msg_name = (caddr_t)SCARG(uap, to); /* XXX kills const */ 415 msg.msg_namelen = SCARG(uap, tolen); 416 msg.msg_iov = &aiov; 417 msg.msg_iovlen = 1; 418 msg.msg_control = 0; 419 msg.msg_flags = 0; 420 aiov.iov_base = (char *)SCARG(uap, buf); /* XXX kills const */ 421 aiov.iov_len = SCARG(uap, len); 422 return (sendit(p, SCARG(uap, s), &msg, SCARG(uap, flags), retval)); 423 } 424 425 int 426 sys_sendmsg(struct lwp *l, void *v, register_t *retval) 427 { 428 struct sys_sendmsg_args /* { 429 syscallarg(int) s; 430 syscallarg(const struct msghdr *) msg; 431 syscallarg(int) flags; 432 } */ *uap = v; 433 struct proc *p; 434 struct msghdr msg; 435 struct iovec aiov[UIO_SMALLIOV], *iov; 436 int error; 437 438 error = copyin(SCARG(uap, msg), (caddr_t)&msg, sizeof(msg)); 439 if (error) 440 return (error); 441 if ((unsigned int)msg.msg_iovlen > UIO_SMALLIOV) { 442 if ((unsigned int)msg.msg_iovlen > IOV_MAX) 443 return (EMSGSIZE); 444 iov = malloc(sizeof(struct iovec) * msg.msg_iovlen, 445 M_IOV, M_WAITOK); 446 } else 447 iov = aiov; 448 if ((unsigned int)msg.msg_iovlen > 0) { 449 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 450 (size_t)(msg.msg_iovlen * sizeof(struct iovec))); 451 if (error) 452 goto done; 453 } 454 msg.msg_iov = iov; 455 msg.msg_flags = 0; 456 p = l->l_proc; 457 error = sendit(p, SCARG(uap, s), &msg, SCARG(uap, flags), retval); 458 done: 459 if (iov != aiov) 460 free(iov, M_IOV); 461 return (error); 462 } 463 464 int 465 sendit(struct proc *p, int s, struct msghdr *mp, int flags, register_t *retsize) 466 { 467 struct file *fp; 468 struct uio auio; 469 struct iovec *iov; 470 int i, len, error; 471 struct mbuf *to, *control; 472 struct socket *so; 473 #ifdef KTRACE 474 struct iovec *ktriov; 475 #endif 476 477 #ifdef KTRACE 478 ktriov = NULL; 479 #endif 480 /* getsock() will use the descriptor for us */ 481 if ((error = getsock(p->p_fd, s, &fp)) != 0) 482 return (error); 483 so = (struct socket *)fp->f_data; 484 auio.uio_iov = mp->msg_iov; 485 auio.uio_iovcnt = mp->msg_iovlen; 486 auio.uio_segflg = UIO_USERSPACE; 487 auio.uio_rw = UIO_WRITE; 488 auio.uio_procp = p; 489 auio.uio_offset = 0; /* XXX */ 490 auio.uio_resid = 0; 491 iov = mp->msg_iov; 492 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 493 #if 0 494 /* cannot happen; iov_len is unsigned */ 495 if (iov->iov_len < 0) { 496 error = EINVAL; 497 goto out; 498 } 499 #endif 500 /* 501 * Writes return ssize_t because -1 is returned on error. 502 * Therefore, we must restrict the length to SSIZE_MAX to 503 * avoid garbage return values. 504 */ 505 auio.uio_resid += iov->iov_len; 506 if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { 507 error = EINVAL; 508 goto out; 509 } 510 } 511 if (mp->msg_name) { 512 error = sockargs(&to, mp->msg_name, mp->msg_namelen, 513 MT_SONAME); 514 if (error) 515 goto out; 516 MCLAIM(to, so->so_mowner); 517 } else 518 to = 0; 519 if (mp->msg_control) { 520 if (mp->msg_controllen < CMSG_ALIGN(sizeof(struct cmsghdr))) { 521 error = EINVAL; 522 goto bad; 523 } 524 error = sockargs(&control, mp->msg_control, 525 mp->msg_controllen, MT_CONTROL); 526 if (error) 527 goto bad; 528 MCLAIM(control, so->so_mowner); 529 } else 530 control = 0; 531 #ifdef KTRACE 532 if (KTRPOINT(p, KTR_GENIO)) { 533 int iovlen = auio.uio_iovcnt * sizeof(struct iovec); 534 535 ktriov = malloc(iovlen, M_TEMP, M_WAITOK); 536 memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen); 537 } 538 #endif 539 len = auio.uio_resid; 540 error = (*so->so_send)(so, to, &auio, NULL, control, flags); 541 if (error) { 542 if (auio.uio_resid != len && (error == ERESTART || 543 error == EINTR || error == EWOULDBLOCK)) 544 error = 0; 545 if (error == EPIPE) 546 psignal(p, SIGPIPE); 547 } 548 if (error == 0) 549 *retsize = len - auio.uio_resid; 550 #ifdef KTRACE 551 if (ktriov != NULL) { 552 if (error == 0) 553 ktrgenio(p, s, UIO_WRITE, ktriov, *retsize, error); 554 free(ktriov, M_TEMP); 555 } 556 #endif 557 bad: 558 if (to) 559 m_freem(to); 560 out: 561 FILE_UNUSE(fp, p); 562 return (error); 563 } 564 565 int 566 sys_recvfrom(struct lwp *l, void *v, register_t *retval) 567 { 568 struct sys_recvfrom_args /* { 569 syscallarg(int) s; 570 syscallarg(void *) buf; 571 syscallarg(size_t) len; 572 syscallarg(int) flags; 573 syscallarg(struct sockaddr *) from; 574 syscallarg(unsigned int *) fromlenaddr; 575 } */ *uap = v; 576 struct proc *p; 577 struct msghdr msg; 578 struct iovec aiov; 579 int error; 580 581 if (SCARG(uap, fromlenaddr)) { 582 error = copyin((caddr_t)SCARG(uap, fromlenaddr), 583 (caddr_t)&msg.msg_namelen, 584 sizeof(msg.msg_namelen)); 585 if (error) 586 return (error); 587 } else 588 msg.msg_namelen = 0; 589 msg.msg_name = (caddr_t)SCARG(uap, from); 590 msg.msg_iov = &aiov; 591 msg.msg_iovlen = 1; 592 aiov.iov_base = SCARG(uap, buf); 593 aiov.iov_len = SCARG(uap, len); 594 msg.msg_control = 0; 595 msg.msg_flags = SCARG(uap, flags); 596 p = l->l_proc; 597 return (recvit(p, SCARG(uap, s), &msg, 598 (caddr_t)SCARG(uap, fromlenaddr), retval)); 599 } 600 601 int 602 sys_recvmsg(struct lwp *l, void *v, register_t *retval) 603 { 604 struct sys_recvmsg_args /* { 605 syscallarg(int) s; 606 syscallarg(struct msghdr *) msg; 607 syscallarg(int) flags; 608 } */ *uap = v; 609 struct proc *p; 610 struct msghdr msg; 611 struct iovec aiov[UIO_SMALLIOV], *uiov, *iov; 612 int error; 613 614 error = copyin((caddr_t)SCARG(uap, msg), (caddr_t)&msg, 615 sizeof(msg)); 616 if (error) 617 return (error); 618 if ((unsigned int)msg.msg_iovlen > UIO_SMALLIOV) { 619 if ((unsigned int)msg.msg_iovlen > IOV_MAX) 620 return (EMSGSIZE); 621 iov = malloc(sizeof(struct iovec) * msg.msg_iovlen, 622 M_IOV, M_WAITOK); 623 } else 624 iov = aiov; 625 if ((unsigned int)msg.msg_iovlen > 0) { 626 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 627 (size_t)(msg.msg_iovlen * sizeof(struct iovec))); 628 if (error) 629 goto done; 630 } 631 uiov = msg.msg_iov; 632 msg.msg_iov = iov; 633 msg.msg_flags = SCARG(uap, flags); 634 p = l->l_proc; 635 if ((error = recvit(p, SCARG(uap, s), &msg, (caddr_t)0, retval)) == 0) { 636 msg.msg_iov = uiov; 637 error = copyout((caddr_t)&msg, (caddr_t)SCARG(uap, msg), 638 sizeof(msg)); 639 } 640 done: 641 if (iov != aiov) 642 free(iov, M_IOV); 643 return (error); 644 } 645 646 int 647 recvit(struct proc *p, int s, struct msghdr *mp, caddr_t namelenp, 648 register_t *retsize) 649 { 650 struct file *fp; 651 struct uio auio; 652 struct iovec *iov; 653 int i, len, error; 654 struct mbuf *from, *control; 655 struct socket *so; 656 #ifdef KTRACE 657 struct iovec *ktriov; 658 #endif 659 660 from = 0; 661 control = 0; 662 #ifdef KTRACE 663 ktriov = NULL; 664 #endif 665 666 /* getsock() will use the descriptor for us */ 667 if ((error = getsock(p->p_fd, s, &fp)) != 0) 668 return (error); 669 so = (struct socket *)fp->f_data; 670 auio.uio_iov = mp->msg_iov; 671 auio.uio_iovcnt = mp->msg_iovlen; 672 auio.uio_segflg = UIO_USERSPACE; 673 auio.uio_rw = UIO_READ; 674 auio.uio_procp = p; 675 auio.uio_offset = 0; /* XXX */ 676 auio.uio_resid = 0; 677 iov = mp->msg_iov; 678 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 679 #if 0 680 /* cannot happen iov_len is unsigned */ 681 if (iov->iov_len < 0) { 682 error = EINVAL; 683 goto out1; 684 } 685 #endif 686 /* 687 * Reads return ssize_t because -1 is returned on error. 688 * Therefore we must restrict the length to SSIZE_MAX to 689 * avoid garbage return values. 690 */ 691 auio.uio_resid += iov->iov_len; 692 if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { 693 error = EINVAL; 694 goto out1; 695 } 696 } 697 #ifdef KTRACE 698 if (KTRPOINT(p, KTR_GENIO)) { 699 int iovlen = auio.uio_iovcnt * sizeof(struct iovec); 700 701 ktriov = malloc(iovlen, M_TEMP, M_WAITOK); 702 memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen); 703 } 704 #endif 705 len = auio.uio_resid; 706 error = (*so->so_receive)(so, &from, &auio, NULL, 707 mp->msg_control ? &control : NULL, &mp->msg_flags); 708 if (error) { 709 if (auio.uio_resid != len && (error == ERESTART || 710 error == EINTR || error == EWOULDBLOCK)) 711 error = 0; 712 } 713 #ifdef KTRACE 714 if (ktriov != NULL) { 715 if (error == 0) 716 ktrgenio(p, s, UIO_READ, ktriov, 717 len - auio.uio_resid, error); 718 free(ktriov, M_TEMP); 719 } 720 #endif 721 if (error) 722 goto out; 723 *retsize = len - auio.uio_resid; 724 if (mp->msg_name) { 725 len = mp->msg_namelen; 726 if (len <= 0 || from == 0) 727 len = 0; 728 else { 729 if (len > from->m_len) 730 len = from->m_len; 731 /* else if len < from->m_len ??? */ 732 error = copyout(mtod(from, caddr_t), 733 (caddr_t)mp->msg_name, (unsigned)len); 734 if (error) 735 goto out; 736 } 737 mp->msg_namelen = len; 738 if (namelenp && 739 (error = copyout((caddr_t)&len, namelenp, sizeof(int)))) 740 goto out; 741 } 742 if (mp->msg_control) { 743 len = mp->msg_controllen; 744 if (len <= 0 || control == 0) 745 len = 0; 746 else { 747 struct mbuf *m = control; 748 caddr_t p = (caddr_t)mp->msg_control; 749 750 do { 751 i = m->m_len; 752 if (len < i) { 753 mp->msg_flags |= MSG_CTRUNC; 754 i = len; 755 } 756 error = copyout(mtod(m, caddr_t), p, 757 (unsigned)i); 758 if (m->m_next) 759 i = ALIGN(i); 760 p += i; 761 len -= i; 762 if (error != 0 || len <= 0) 763 break; 764 } while ((m = m->m_next) != NULL); 765 len = p - (caddr_t)mp->msg_control; 766 } 767 mp->msg_controllen = len; 768 } 769 out: 770 if (from) 771 m_freem(from); 772 if (control) 773 m_freem(control); 774 out1: 775 FILE_UNUSE(fp, p); 776 return (error); 777 } 778 779 /* ARGSUSED */ 780 int 781 sys_shutdown(struct lwp *l, void *v, register_t *retval) 782 { 783 struct sys_shutdown_args /* { 784 syscallarg(int) s; 785 syscallarg(int) how; 786 } */ *uap = v; 787 struct proc *p; 788 struct file *fp; 789 int error; 790 791 p = l->l_proc; 792 /* getsock() will use the descriptor for us */ 793 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 794 return (error); 795 error = soshutdown((struct socket *)fp->f_data, SCARG(uap, how)); 796 FILE_UNUSE(fp, p); 797 return (error); 798 } 799 800 /* ARGSUSED */ 801 int 802 sys_setsockopt(struct lwp *l, void *v, register_t *retval) 803 { 804 struct sys_setsockopt_args /* { 805 syscallarg(int) s; 806 syscallarg(int) level; 807 syscallarg(int) name; 808 syscallarg(const void *) val; 809 syscallarg(unsigned int) valsize; 810 } */ *uap = v; 811 struct proc *p; 812 struct file *fp; 813 struct mbuf *m; 814 struct socket *so; 815 int error; 816 unsigned int len; 817 818 p = l->l_proc; 819 m = NULL; 820 /* getsock() will use the descriptor for us */ 821 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 822 return (error); 823 so = (struct socket *)fp->f_data; 824 len = SCARG(uap, valsize); 825 if (len > MCLBYTES) { 826 error = EINVAL; 827 goto out; 828 } 829 if (SCARG(uap, val)) { 830 m = m_get(M_WAIT, MT_SOOPTS); 831 MCLAIM(m, so->so_mowner); 832 if (len > MLEN) 833 m_clget(m, M_WAIT); 834 error = copyin(SCARG(uap, val), mtod(m, caddr_t), len); 835 if (error) { 836 (void) m_free(m); 837 goto out; 838 } 839 m->m_len = SCARG(uap, valsize); 840 } 841 error = sosetopt(so, SCARG(uap, level), SCARG(uap, name), m); 842 out: 843 FILE_UNUSE(fp, p); 844 return (error); 845 } 846 847 /* ARGSUSED */ 848 int 849 sys_getsockopt(struct lwp *l, void *v, register_t *retval) 850 { 851 struct sys_getsockopt_args /* { 852 syscallarg(int) s; 853 syscallarg(int) level; 854 syscallarg(int) name; 855 syscallarg(void *) val; 856 syscallarg(unsigned int *) avalsize; 857 } */ *uap = v; 858 struct proc *p; 859 struct file *fp; 860 struct mbuf *m; 861 unsigned int op, i, valsize; 862 int error; 863 864 p = l->l_proc; 865 m = NULL; 866 /* getsock() will use the descriptor for us */ 867 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 868 return (error); 869 if (SCARG(uap, val)) { 870 error = copyin((caddr_t)SCARG(uap, avalsize), 871 (caddr_t)&valsize, sizeof(valsize)); 872 if (error) 873 goto out; 874 } else 875 valsize = 0; 876 if ((error = sogetopt((struct socket *)fp->f_data, SCARG(uap, level), 877 SCARG(uap, name), &m)) == 0 && SCARG(uap, val) && valsize && 878 m != NULL) { 879 op = 0; 880 while (m && !error && op < valsize) { 881 i = min(m->m_len, (valsize - op)); 882 error = copyout(mtod(m, caddr_t), SCARG(uap, val), i); 883 op += i; 884 SCARG(uap, val) = ((u_int8_t *)SCARG(uap, val)) + i; 885 m = m_free(m); 886 } 887 valsize = op; 888 if (error == 0) 889 error = copyout(&valsize, 890 SCARG(uap, avalsize), sizeof(valsize)); 891 } 892 if (m != NULL) 893 (void) m_freem(m); 894 out: 895 FILE_UNUSE(fp, p); 896 return (error); 897 } 898 899 #ifdef PIPE_SOCKETPAIR 900 /* ARGSUSED */ 901 int 902 sys_pipe(struct lwp *l, void *v, register_t *retval) 903 { 904 struct proc *p; 905 struct filedesc *fdp; 906 struct file *rf, *wf; 907 struct socket *rso, *wso; 908 int fd, error; 909 910 p = l->l_proc; 911 fdp = p->p_fd; 912 if ((error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0)) != 0) 913 return (error); 914 if ((error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0)) != 0) 915 goto free1; 916 /* remember this socket pair implements a pipe */ 917 wso->so_state |= SS_ISAPIPE; 918 rso->so_state |= SS_ISAPIPE; 919 /* falloc() will use the descriptor for us */ 920 if ((error = falloc(p, &rf, &fd)) != 0) 921 goto free2; 922 retval[0] = fd; 923 rf->f_flag = FREAD; 924 rf->f_type = DTYPE_SOCKET; 925 rf->f_ops = &socketops; 926 rf->f_data = (caddr_t)rso; 927 if ((error = falloc(p, &wf, &fd)) != 0) 928 goto free3; 929 wf->f_flag = FWRITE; 930 wf->f_type = DTYPE_SOCKET; 931 wf->f_ops = &socketops; 932 wf->f_data = (caddr_t)wso; 933 retval[1] = fd; 934 if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0) 935 goto free4; 936 FILE_SET_MATURE(rf); 937 FILE_SET_MATURE(wf); 938 FILE_UNUSE(rf, p); 939 FILE_UNUSE(wf, p); 940 return (0); 941 free4: 942 FILE_UNUSE(wf, p); 943 ffree(wf); 944 fdremove(fdp, retval[1]); 945 free3: 946 FILE_UNUSE(rf, p); 947 ffree(rf); 948 fdremove(fdp, retval[0]); 949 free2: 950 (void)soclose(wso); 951 free1: 952 (void)soclose(rso); 953 return (error); 954 } 955 #endif /* PIPE_SOCKETPAIR */ 956 957 /* 958 * Get socket name. 959 */ 960 /* ARGSUSED */ 961 int 962 sys_getsockname(struct lwp *l, void *v, register_t *retval) 963 { 964 struct sys_getsockname_args /* { 965 syscallarg(int) fdes; 966 syscallarg(struct sockaddr *) asa; 967 syscallarg(unsigned int *) alen; 968 } */ *uap = v; 969 struct proc *p; 970 struct file *fp; 971 struct socket *so; 972 struct mbuf *m; 973 unsigned int len; 974 int error; 975 976 p = l->l_proc; 977 /* getsock() will use the descriptor for us */ 978 if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0) 979 return (error); 980 error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof(len)); 981 if (error) 982 goto out; 983 so = (struct socket *)fp->f_data; 984 m = m_getclr(M_WAIT, MT_SONAME); 985 MCLAIM(m, so->so_mowner); 986 error = (*so->so_proto->pr_usrreq)(so, PRU_SOCKADDR, (struct mbuf *)0, 987 m, (struct mbuf *)0, (struct proc *)0); 988 if (error) 989 goto bad; 990 if (len > m->m_len) 991 len = m->m_len; 992 error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len); 993 if (error == 0) 994 error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen), 995 sizeof(len)); 996 bad: 997 m_freem(m); 998 out: 999 FILE_UNUSE(fp, p); 1000 return (error); 1001 } 1002 1003 /* 1004 * Get name of peer for connected socket. 1005 */ 1006 /* ARGSUSED */ 1007 int 1008 sys_getpeername(struct lwp *l, void *v, register_t *retval) 1009 { 1010 struct sys_getpeername_args /* { 1011 syscallarg(int) fdes; 1012 syscallarg(struct sockaddr *) asa; 1013 syscallarg(unsigned int *) alen; 1014 } */ *uap = v; 1015 struct proc *p; 1016 struct file *fp; 1017 struct socket *so; 1018 struct mbuf *m; 1019 unsigned int len; 1020 int error; 1021 1022 p = l->l_proc; 1023 /* getsock() will use the descriptor for us */ 1024 if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0) 1025 return (error); 1026 so = (struct socket *)fp->f_data; 1027 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1028 error = ENOTCONN; 1029 goto out; 1030 } 1031 error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof(len)); 1032 if (error) 1033 goto out; 1034 m = m_getclr(M_WAIT, MT_SONAME); 1035 MCLAIM(m, so->so_mowner); 1036 error = (*so->so_proto->pr_usrreq)(so, PRU_PEERADDR, (struct mbuf *)0, 1037 m, (struct mbuf *)0, (struct proc *)0); 1038 if (error) 1039 goto bad; 1040 if (len > m->m_len) 1041 len = m->m_len; 1042 error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len); 1043 if (error) 1044 goto bad; 1045 error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen), sizeof(len)); 1046 bad: 1047 m_freem(m); 1048 out: 1049 FILE_UNUSE(fp, p); 1050 return (error); 1051 } 1052 1053 /* 1054 * XXX In a perfect world, we wouldn't pass around socket control 1055 * XXX arguments in mbufs, and this could go away. 1056 */ 1057 int 1058 sockargs(struct mbuf **mp, const void *buf, size_t buflen, int type) 1059 { 1060 struct sockaddr *sa; 1061 struct mbuf *m; 1062 int error; 1063 1064 /* 1065 * We can't allow socket names > UCHAR_MAX in length, since that 1066 * will overflow sa_len. Control data more than a page size in 1067 * length is just too much. 1068 */ 1069 if (buflen > (type == MT_SONAME ? UCHAR_MAX : PAGE_SIZE)) 1070 return (EINVAL); 1071 1072 /* Allocate an mbuf to hold the arguments. */ 1073 m = m_get(M_WAIT, type); 1074 /* can't claim. don't who to assign it to. */ 1075 if (buflen > MLEN) { 1076 /* 1077 * Won't fit into a regular mbuf, so we allocate just 1078 * enough external storage to hold the argument. 1079 */ 1080 MEXTMALLOC(m, buflen, M_WAITOK); 1081 } 1082 m->m_len = buflen; 1083 error = copyin(buf, mtod(m, caddr_t), buflen); 1084 if (error) { 1085 (void) m_free(m); 1086 return (error); 1087 } 1088 *mp = m; 1089 if (type == MT_SONAME) { 1090 sa = mtod(m, struct sockaddr *); 1091 #if BYTE_ORDER != BIG_ENDIAN 1092 /* 1093 * 4.3BSD compat thing - need to stay, since bind(2), 1094 * connect(2), sendto(2) were not versioned for COMPAT_43. 1095 */ 1096 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1097 sa->sa_family = sa->sa_len; 1098 #endif 1099 sa->sa_len = buflen; 1100 } 1101 return (0); 1102 } 1103 1104 int 1105 getsock(struct filedesc *fdp, int fdes, struct file **fpp) 1106 { 1107 struct file *fp; 1108 1109 if ((fp = fd_getfile(fdp, fdes)) == NULL) 1110 return (EBADF); 1111 1112 FILE_USE(fp); 1113 1114 if (fp->f_type != DTYPE_SOCKET) { 1115 FILE_UNUSE(fp, NULL); 1116 return (ENOTSOCK); 1117 } 1118 *fpp = fp; 1119 return (0); 1120 }
Cache object: b1a567649eb8d17f7eccd95522cd3896
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