Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_syscalls.c
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1 /* $NetBSD: uipc_syscalls.c,v 1.90.2.6 2006/10/24 16:59:08 ghen 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 1.90.2.6 2006/10/24 16:59:08 ghen 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 static void adjust_rights(struct mbuf *m, int len, struct proc *p); 65 66 /* 67 * System call interface to the socket abstraction. 68 */ 69 extern const struct fileops socketops; 70 71 int 72 sys_socket(struct lwp *l, void *v, register_t *retval) 73 { 74 struct sys_socket_args /* { 75 syscallarg(int) domain; 76 syscallarg(int) type; 77 syscallarg(int) protocol; 78 } */ *uap = v; 79 80 struct proc *p; 81 struct filedesc *fdp; 82 struct socket *so; 83 struct file *fp; 84 int fd, error; 85 86 p = l->l_proc; 87 fdp = p->p_fd; 88 /* falloc() will use the desciptor for us */ 89 if ((error = falloc(p, &fp, &fd)) != 0) 90 return (error); 91 fp->f_flag = FREAD|FWRITE; 92 fp->f_type = DTYPE_SOCKET; 93 fp->f_ops = &socketops; 94 error = socreate(SCARG(uap, domain), &so, SCARG(uap, type), 95 SCARG(uap, protocol), p); 96 if (error) { 97 FILE_UNUSE(fp, p); 98 fdremove(fdp, fd); 99 ffree(fp); 100 } else { 101 fp->f_data = (caddr_t)so; 102 FILE_SET_MATURE(fp); 103 FILE_UNUSE(fp, p); 104 *retval = fd; 105 } 106 return (error); 107 } 108 109 /* ARGSUSED */ 110 int 111 sys_bind(struct lwp *l, void *v, register_t *retval) 112 { 113 struct sys_bind_args /* { 114 syscallarg(int) s; 115 syscallarg(const struct sockaddr *) name; 116 syscallarg(unsigned int) namelen; 117 } */ *uap = v; 118 struct proc *p; 119 struct file *fp; 120 struct mbuf *nam; 121 int error; 122 123 p = l->l_proc; 124 /* getsock() will use the descriptor for us */ 125 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 126 return (error); 127 error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen), 128 MT_SONAME); 129 if (error) { 130 FILE_UNUSE(fp, p); 131 return (error); 132 } 133 MCLAIM(nam, ((struct socket *)fp->f_data)->so_mowner); 134 error = sobind((struct socket *)fp->f_data, nam, p); 135 m_freem(nam); 136 FILE_UNUSE(fp, p); 137 return (error); 138 } 139 140 /* ARGSUSED */ 141 int 142 sys_listen(struct lwp *l, void *v, register_t *retval) 143 { 144 struct sys_listen_args /* { 145 syscallarg(int) s; 146 syscallarg(int) backlog; 147 } */ *uap = v; 148 struct proc *p; 149 struct file *fp; 150 int error; 151 152 p = l->l_proc; 153 /* getsock() will use the descriptor for us */ 154 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 155 return (error); 156 error = solisten((struct socket *)fp->f_data, SCARG(uap, backlog)); 157 FILE_UNUSE(fp, p); 158 return (error); 159 } 160 161 int 162 sys_accept(struct lwp *l, void *v, register_t *retval) 163 { 164 struct sys_accept_args /* { 165 syscallarg(int) s; 166 syscallarg(struct sockaddr *) name; 167 syscallarg(unsigned int *) anamelen; 168 } */ *uap = v; 169 struct proc *p; 170 struct filedesc *fdp; 171 struct file *fp; 172 struct mbuf *nam; 173 unsigned int namelen; 174 int error, s, fd; 175 struct socket *so; 176 int fflag; 177 178 p = l->l_proc; 179 fdp = p->p_fd; 180 if (SCARG(uap, name) && (error = copyin(SCARG(uap, anamelen), 181 &namelen, sizeof(namelen)))) 182 return (error); 183 184 /* getsock() will use the descriptor for us */ 185 if ((error = getsock(fdp, SCARG(uap, s), &fp)) != 0) 186 return (error); 187 s = splsoftnet(); 188 so = (struct socket *)fp->f_data; 189 FILE_UNUSE(fp, p); 190 if (!(so->so_proto->pr_flags & PR_LISTEN)) { 191 splx(s); 192 return (EOPNOTSUPP); 193 } 194 if ((so->so_options & SO_ACCEPTCONN) == 0) { 195 splx(s); 196 return (EINVAL); 197 } 198 if ((so->so_state & SS_NBIO) && so->so_qlen == 0) { 199 splx(s); 200 return (EWOULDBLOCK); 201 } 202 while (so->so_qlen == 0 && so->so_error == 0) { 203 if (so->so_state & SS_CANTRCVMORE) { 204 so->so_error = ECONNABORTED; 205 break; 206 } 207 error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, 208 netcon, 0); 209 if (error) { 210 splx(s); 211 return (error); 212 } 213 } 214 if (so->so_error) { 215 error = so->so_error; 216 so->so_error = 0; 217 splx(s); 218 return (error); 219 } 220 fflag = fp->f_flag; 221 /* falloc() will use the descriptor for us */ 222 if ((error = falloc(p, &fp, &fd)) != 0) { 223 splx(s); 224 return (error); 225 } 226 *retval = fd; 227 228 /* connection has been removed from the listen queue */ 229 KNOTE(&so->so_rcv.sb_sel.sel_klist, 0); 230 231 { struct socket *aso = TAILQ_FIRST(&so->so_q); 232 if (soqremque(aso, 1) == 0) 233 panic("accept"); 234 so = aso; 235 } 236 fp->f_type = DTYPE_SOCKET; 237 fp->f_flag = fflag; 238 fp->f_ops = &socketops; 239 fp->f_data = (caddr_t)so; 240 FILE_UNUSE(fp, p); 241 nam = m_get(M_WAIT, MT_SONAME); 242 if ((error = soaccept(so, nam)) == 0 && SCARG(uap, name)) { 243 if (namelen > nam->m_len) 244 namelen = nam->m_len; 245 /* SHOULD COPY OUT A CHAIN HERE */ 246 if ((error = copyout(mtod(nam, caddr_t), 247 (caddr_t)SCARG(uap, name), namelen)) != 0 || 248 (error = copyout((caddr_t)&namelen, 249 (caddr_t)SCARG(uap, anamelen), 250 sizeof(*SCARG(uap, anamelen)))) != 0) { 251 soclose(so); 252 } 253 } 254 /* if an error occurred, free the file descriptor */ 255 if (error) { 256 fdremove(fdp, fd); 257 ffree(fp); 258 } 259 m_freem(nam); 260 splx(s); 261 FILE_SET_MATURE(fp); 262 return (error); 263 } 264 265 /* ARGSUSED */ 266 int 267 sys_connect(struct lwp *l, void *v, register_t *retval) 268 { 269 struct sys_connect_args /* { 270 syscallarg(int) s; 271 syscallarg(const struct sockaddr *) name; 272 syscallarg(unsigned int) namelen; 273 } */ *uap = v; 274 struct proc *p; 275 struct file *fp; 276 struct socket *so; 277 struct mbuf *nam; 278 int error, s; 279 int interrupted = 0; 280 281 p = l->l_proc; 282 /* getsock() will use the descriptor for us */ 283 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 284 return (error); 285 so = (struct socket *)fp->f_data; 286 if (so->so_state & SS_ISCONNECTING) { 287 error = EALREADY; 288 goto out; 289 } 290 error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen), 291 MT_SONAME); 292 if (error) 293 goto out; 294 MCLAIM(nam, so->so_mowner); 295 error = soconnect(so, nam, p); 296 if (error) 297 goto bad; 298 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 299 m_freem(nam); 300 error = EINPROGRESS; 301 goto out; 302 } 303 s = splsoftnet(); 304 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 305 error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH, 306 netcon, 0); 307 if (error) { 308 if (error == EINTR || error == ERESTART) 309 interrupted = 1; 310 break; 311 } 312 } 313 if (error == 0) { 314 error = so->so_error; 315 so->so_error = 0; 316 } 317 splx(s); 318 bad: 319 if (!interrupted) 320 so->so_state &= ~SS_ISCONNECTING; 321 m_freem(nam); 322 if (error == ERESTART) 323 error = EINTR; 324 out: 325 FILE_UNUSE(fp, p); 326 return (error); 327 } 328 329 int 330 sys_socketpair(struct lwp *l, void *v, register_t *retval) 331 { 332 struct sys_socketpair_args /* { 333 syscallarg(int) domain; 334 syscallarg(int) type; 335 syscallarg(int) protocol; 336 syscallarg(int *) rsv; 337 } */ *uap = v; 338 struct proc *p; 339 struct filedesc *fdp; 340 struct file *fp1, *fp2; 341 struct socket *so1, *so2; 342 int fd, error, sv[2]; 343 344 p = l->l_proc; 345 fdp = p->p_fd; 346 error = socreate(SCARG(uap, domain), &so1, SCARG(uap, type), 347 SCARG(uap, protocol), p); 348 if (error) 349 return (error); 350 error = socreate(SCARG(uap, domain), &so2, SCARG(uap, type), 351 SCARG(uap, protocol), p); 352 if (error) 353 goto free1; 354 /* falloc() will use the descriptor for us */ 355 if ((error = falloc(p, &fp1, &fd)) != 0) 356 goto free2; 357 sv[0] = fd; 358 fp1->f_flag = FREAD|FWRITE; 359 fp1->f_type = DTYPE_SOCKET; 360 fp1->f_ops = &socketops; 361 fp1->f_data = (caddr_t)so1; 362 if ((error = falloc(p, &fp2, &fd)) != 0) 363 goto free3; 364 fp2->f_flag = FREAD|FWRITE; 365 fp2->f_type = DTYPE_SOCKET; 366 fp2->f_ops = &socketops; 367 fp2->f_data = (caddr_t)so2; 368 sv[1] = fd; 369 if ((error = soconnect2(so1, so2)) != 0) 370 goto free4; 371 if (SCARG(uap, type) == SOCK_DGRAM) { 372 /* 373 * Datagram socket connection is asymmetric. 374 */ 375 if ((error = soconnect2(so2, so1)) != 0) 376 goto free4; 377 } 378 error = copyout((caddr_t)sv, (caddr_t)SCARG(uap, rsv), 379 2 * sizeof(int)); 380 FILE_SET_MATURE(fp1); 381 FILE_SET_MATURE(fp2); 382 FILE_UNUSE(fp1, p); 383 FILE_UNUSE(fp2, p); 384 return (error); 385 free4: 386 FILE_UNUSE(fp2, p); 387 ffree(fp2); 388 fdremove(fdp, sv[1]); 389 free3: 390 FILE_UNUSE(fp1, p); 391 ffree(fp1); 392 fdremove(fdp, sv[0]); 393 free2: 394 (void)soclose(so2); 395 free1: 396 (void)soclose(so1); 397 return (error); 398 } 399 400 int 401 sys_sendto(struct lwp *l, void *v, register_t *retval) 402 { 403 struct sys_sendto_args /* { 404 syscallarg(int) s; 405 syscallarg(const void *) buf; 406 syscallarg(size_t) len; 407 syscallarg(int) flags; 408 syscallarg(const struct sockaddr *) to; 409 syscallarg(unsigned int) tolen; 410 } */ *uap = v; 411 struct proc *p; 412 struct msghdr msg; 413 struct iovec aiov; 414 415 p = l->l_proc; 416 msg.msg_name = __UNCONST(SCARG(uap, to)); /* XXXUNCONST kills const */ 417 msg.msg_namelen = SCARG(uap, tolen); 418 msg.msg_iov = &aiov; 419 msg.msg_iovlen = 1; 420 msg.msg_control = 0; 421 msg.msg_flags = 0; 422 aiov.iov_base = __UNCONST(SCARG(uap, buf)); /* XXXUNCONST kills const */ 423 aiov.iov_len = SCARG(uap, len); 424 return (sendit(p, SCARG(uap, s), &msg, SCARG(uap, flags), retval)); 425 } 426 427 int 428 sys_sendmsg(struct lwp *l, void *v, register_t *retval) 429 { 430 struct sys_sendmsg_args /* { 431 syscallarg(int) s; 432 syscallarg(const struct msghdr *) msg; 433 syscallarg(int) flags; 434 } */ *uap = v; 435 struct proc *p; 436 struct msghdr msg; 437 struct iovec aiov[UIO_SMALLIOV], *iov; 438 int error; 439 440 error = copyin(SCARG(uap, msg), (caddr_t)&msg, sizeof(msg)); 441 if (error) 442 return (error); 443 if ((unsigned int)msg.msg_iovlen > UIO_SMALLIOV) { 444 if ((unsigned int)msg.msg_iovlen > IOV_MAX) 445 return (EMSGSIZE); 446 iov = malloc(sizeof(struct iovec) * msg.msg_iovlen, 447 M_IOV, M_WAITOK); 448 } else 449 iov = aiov; 450 if ((unsigned int)msg.msg_iovlen > 0) { 451 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 452 (size_t)(msg.msg_iovlen * sizeof(struct iovec))); 453 if (error) 454 goto done; 455 } 456 msg.msg_iov = iov; 457 msg.msg_flags = 0; 458 p = l->l_proc; 459 error = sendit(p, SCARG(uap, s), &msg, SCARG(uap, flags), retval); 460 done: 461 if (iov != aiov) 462 free(iov, M_IOV); 463 return (error); 464 } 465 466 int 467 sendit(struct proc *p, int s, struct msghdr *mp, int flags, register_t *retsize) 468 { 469 struct file *fp; 470 struct uio auio; 471 struct iovec *iov; 472 int i, len, error; 473 struct mbuf *to, *control; 474 struct socket *so; 475 #ifdef KTRACE 476 struct iovec *ktriov; 477 #endif 478 479 #ifdef KTRACE 480 ktriov = NULL; 481 #endif 482 /* getsock() will use the descriptor for us */ 483 if ((error = getsock(p->p_fd, s, &fp)) != 0) 484 return (error); 485 so = (struct socket *)fp->f_data; 486 auio.uio_iov = mp->msg_iov; 487 auio.uio_iovcnt = mp->msg_iovlen; 488 auio.uio_segflg = UIO_USERSPACE; 489 auio.uio_rw = UIO_WRITE; 490 auio.uio_procp = p; 491 auio.uio_offset = 0; /* XXX */ 492 auio.uio_resid = 0; 493 iov = mp->msg_iov; 494 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 495 #if 0 496 /* cannot happen; iov_len is unsigned */ 497 if (iov->iov_len < 0) { 498 error = EINVAL; 499 goto out; 500 } 501 #endif 502 /* 503 * Writes return ssize_t because -1 is returned on error. 504 * Therefore, we must restrict the length to SSIZE_MAX to 505 * avoid garbage return values. 506 */ 507 auio.uio_resid += iov->iov_len; 508 if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { 509 error = EINVAL; 510 goto out; 511 } 512 } 513 if (mp->msg_name) { 514 error = sockargs(&to, mp->msg_name, mp->msg_namelen, 515 MT_SONAME); 516 if (error) 517 goto out; 518 MCLAIM(to, so->so_mowner); 519 } else 520 to = 0; 521 if (mp->msg_control) { 522 if (mp->msg_controllen < CMSG_ALIGN(sizeof(struct cmsghdr))) { 523 error = EINVAL; 524 goto bad; 525 } 526 error = sockargs(&control, mp->msg_control, 527 mp->msg_controllen, MT_CONTROL); 528 if (error) 529 goto bad; 530 MCLAIM(control, so->so_mowner); 531 } else 532 control = 0; 533 #ifdef KTRACE 534 if (KTRPOINT(p, KTR_GENIO)) { 535 int iovlen = auio.uio_iovcnt * sizeof(struct iovec); 536 537 ktriov = malloc(iovlen, M_TEMP, M_WAITOK); 538 memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen); 539 } 540 #endif 541 len = auio.uio_resid; 542 error = (*so->so_send)(so, to, &auio, NULL, control, flags, p); 543 if (error) { 544 if (auio.uio_resid != len && (error == ERESTART || 545 error == EINTR || error == EWOULDBLOCK)) 546 error = 0; 547 if (error == EPIPE) 548 psignal(p, SIGPIPE); 549 } 550 if (error == 0) 551 *retsize = len - auio.uio_resid; 552 #ifdef KTRACE 553 if (ktriov != NULL) { 554 if (error == 0) 555 ktrgenio(p, s, UIO_WRITE, ktriov, *retsize, error); 556 free(ktriov, M_TEMP); 557 } 558 #endif 559 bad: 560 if (to) 561 m_freem(to); 562 out: 563 FILE_UNUSE(fp, p); 564 return (error); 565 } 566 567 int 568 sys_recvfrom(struct lwp *l, void *v, register_t *retval) 569 { 570 struct sys_recvfrom_args /* { 571 syscallarg(int) s; 572 syscallarg(void *) buf; 573 syscallarg(size_t) len; 574 syscallarg(int) flags; 575 syscallarg(struct sockaddr *) from; 576 syscallarg(unsigned int *) fromlenaddr; 577 } */ *uap = v; 578 struct proc *p; 579 struct msghdr msg; 580 struct iovec aiov; 581 int error; 582 583 if (SCARG(uap, fromlenaddr)) { 584 error = copyin((caddr_t)SCARG(uap, fromlenaddr), 585 (caddr_t)&msg.msg_namelen, 586 sizeof(msg.msg_namelen)); 587 if (error) 588 return (error); 589 } else 590 msg.msg_namelen = 0; 591 msg.msg_name = (caddr_t)SCARG(uap, from); 592 msg.msg_iov = &aiov; 593 msg.msg_iovlen = 1; 594 aiov.iov_base = SCARG(uap, buf); 595 aiov.iov_len = SCARG(uap, len); 596 msg.msg_control = 0; 597 msg.msg_flags = SCARG(uap, flags); 598 p = l->l_proc; 599 return (recvit(p, SCARG(uap, s), &msg, 600 (caddr_t)SCARG(uap, fromlenaddr), retval)); 601 } 602 603 int 604 sys_recvmsg(struct lwp *l, void *v, register_t *retval) 605 { 606 struct sys_recvmsg_args /* { 607 syscallarg(int) s; 608 syscallarg(struct msghdr *) msg; 609 syscallarg(int) flags; 610 } */ *uap = v; 611 struct proc *p; 612 struct msghdr msg; 613 struct iovec aiov[UIO_SMALLIOV], *uiov, *iov; 614 int error; 615 616 error = copyin((caddr_t)SCARG(uap, msg), (caddr_t)&msg, 617 sizeof(msg)); 618 if (error) 619 return (error); 620 if ((unsigned int)msg.msg_iovlen > UIO_SMALLIOV) { 621 if ((unsigned int)msg.msg_iovlen > IOV_MAX) 622 return (EMSGSIZE); 623 iov = malloc(sizeof(struct iovec) * msg.msg_iovlen, 624 M_IOV, M_WAITOK); 625 } else 626 iov = aiov; 627 if ((unsigned int)msg.msg_iovlen > 0) { 628 error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov, 629 (size_t)(msg.msg_iovlen * sizeof(struct iovec))); 630 if (error) 631 goto done; 632 } 633 uiov = msg.msg_iov; 634 msg.msg_iov = iov; 635 msg.msg_flags = SCARG(uap, flags); 636 p = l->l_proc; 637 if ((error = recvit(p, SCARG(uap, s), &msg, (caddr_t)0, retval)) == 0) { 638 msg.msg_iov = uiov; 639 error = copyout((caddr_t)&msg, (caddr_t)SCARG(uap, msg), 640 sizeof(msg)); 641 } 642 done: 643 if (iov != aiov) 644 free(iov, M_IOV); 645 return (error); 646 } 647 648 /* 649 * Adjust for a truncated SCM_RIGHTS control message. This means 650 * closing any file descriptors that aren't entirely present in the 651 * returned buffer. m is the mbuf holding the (already externalized) 652 * SCM_RIGHTS message; len is the length it is being truncated to. p 653 * is the affected process. 654 */ 655 static void 656 adjust_rights(struct mbuf *m, int len, struct proc *p) 657 { 658 int nfd; 659 int i; 660 int nok; 661 int *fdv; 662 663 nfd = m->m_len < CMSG_SPACE(sizeof(int)) ? 0 664 : (m->m_len - CMSG_SPACE(sizeof(int))) / sizeof(int) + 1; 665 nok = (len < CMSG_LEN(0)) ? 0 : ((len - CMSG_LEN(0)) / sizeof(int)); 666 fdv = (int *) CMSG_DATA(mtod(m,struct cmsghdr *)); 667 for (i = nok; i < nfd; i++) 668 fdrelease(p,fdv[i]); 669 } 670 671 int 672 recvit(struct proc *p, int s, struct msghdr *mp, caddr_t namelenp, 673 register_t *retsize) 674 { 675 struct file *fp; 676 struct uio auio; 677 struct iovec *iov; 678 int i, len, error; 679 struct mbuf *from, *control; 680 struct socket *so; 681 #ifdef KTRACE 682 struct iovec *ktriov; 683 #endif 684 685 from = 0; 686 control = 0; 687 #ifdef KTRACE 688 ktriov = NULL; 689 #endif 690 691 /* getsock() will use the descriptor for us */ 692 if ((error = getsock(p->p_fd, s, &fp)) != 0) 693 return (error); 694 so = (struct socket *)fp->f_data; 695 auio.uio_iov = mp->msg_iov; 696 auio.uio_iovcnt = mp->msg_iovlen; 697 auio.uio_segflg = UIO_USERSPACE; 698 auio.uio_rw = UIO_READ; 699 auio.uio_procp = p; 700 auio.uio_offset = 0; /* XXX */ 701 auio.uio_resid = 0; 702 iov = mp->msg_iov; 703 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 704 #if 0 705 /* cannot happen iov_len is unsigned */ 706 if (iov->iov_len < 0) { 707 error = EINVAL; 708 goto out1; 709 } 710 #endif 711 /* 712 * Reads return ssize_t because -1 is returned on error. 713 * Therefore we must restrict the length to SSIZE_MAX to 714 * avoid garbage return values. 715 */ 716 auio.uio_resid += iov->iov_len; 717 if (iov->iov_len > SSIZE_MAX || auio.uio_resid > SSIZE_MAX) { 718 error = EINVAL; 719 goto out1; 720 } 721 } 722 #ifdef KTRACE 723 if (KTRPOINT(p, KTR_GENIO)) { 724 int iovlen = auio.uio_iovcnt * sizeof(struct iovec); 725 726 ktriov = malloc(iovlen, M_TEMP, M_WAITOK); 727 memcpy((caddr_t)ktriov, (caddr_t)auio.uio_iov, iovlen); 728 } 729 #endif 730 len = auio.uio_resid; 731 error = (*so->so_receive)(so, &from, &auio, NULL, 732 mp->msg_control ? &control : NULL, &mp->msg_flags); 733 if (error) { 734 if (auio.uio_resid != len && (error == ERESTART || 735 error == EINTR || error == EWOULDBLOCK)) 736 error = 0; 737 } 738 #ifdef KTRACE 739 if (ktriov != NULL) { 740 if (error == 0) 741 ktrgenio(p, s, UIO_READ, ktriov, 742 len - auio.uio_resid, error); 743 free(ktriov, M_TEMP); 744 } 745 #endif 746 if (error) 747 goto out; 748 *retsize = len - auio.uio_resid; 749 if (mp->msg_name) { 750 len = mp->msg_namelen; 751 if (len <= 0 || from == 0) 752 len = 0; 753 else { 754 if (len > from->m_len) 755 len = from->m_len; 756 /* else if len < from->m_len ??? */ 757 error = copyout(mtod(from, caddr_t), 758 (caddr_t)mp->msg_name, (unsigned)len); 759 if (error) 760 goto out; 761 } 762 mp->msg_namelen = len; 763 if (namelenp && 764 (error = copyout((caddr_t)&len, namelenp, sizeof(int)))) 765 goto out; 766 } 767 if (mp->msg_control) { 768 len = mp->msg_controllen; 769 if (len <= 0 || control == 0) 770 len = 0; 771 else { 772 struct mbuf *m = control; 773 caddr_t q = (caddr_t)mp->msg_control; 774 775 do { 776 i = m->m_len; 777 if (len < i) { 778 mp->msg_flags |= MSG_CTRUNC; 779 i = len; 780 if (mtod(m, struct cmsghdr *)-> 781 cmsg_type == SCM_RIGHTS) 782 adjust_rights(m, len, p); 783 } 784 error = copyout(mtod(m, caddr_t), q, 785 (unsigned)i); 786 m = m->m_next; 787 if (m) 788 i = ALIGN(i); 789 q += i; 790 len -= i; 791 if (error != 0 || len <= 0) 792 break; 793 } while (m != NULL); 794 while (m) { 795 if (mtod(m, struct cmsghdr *)-> 796 cmsg_type == SCM_RIGHTS) 797 adjust_rights(m, 0, p); 798 m = m->m_next; 799 } 800 len = q - (caddr_t)mp->msg_control; 801 } 802 mp->msg_controllen = len; 803 } 804 out: 805 if (from) 806 m_freem(from); 807 if (control) 808 m_freem(control); 809 out1: 810 FILE_UNUSE(fp, p); 811 return (error); 812 } 813 814 /* ARGSUSED */ 815 int 816 sys_shutdown(struct lwp *l, void *v, register_t *retval) 817 { 818 struct sys_shutdown_args /* { 819 syscallarg(int) s; 820 syscallarg(int) how; 821 } */ *uap = v; 822 struct proc *p; 823 struct file *fp; 824 int error; 825 826 p = l->l_proc; 827 /* getsock() will use the descriptor for us */ 828 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 829 return (error); 830 error = soshutdown((struct socket *)fp->f_data, SCARG(uap, how)); 831 FILE_UNUSE(fp, p); 832 return (error); 833 } 834 835 /* ARGSUSED */ 836 int 837 sys_setsockopt(struct lwp *l, void *v, register_t *retval) 838 { 839 struct sys_setsockopt_args /* { 840 syscallarg(int) s; 841 syscallarg(int) level; 842 syscallarg(int) name; 843 syscallarg(const void *) val; 844 syscallarg(unsigned int) valsize; 845 } */ *uap = v; 846 struct proc *p; 847 struct file *fp; 848 struct mbuf *m; 849 struct socket *so; 850 int error; 851 unsigned int len; 852 853 p = l->l_proc; 854 m = NULL; 855 /* getsock() will use the descriptor for us */ 856 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 857 return (error); 858 so = (struct socket *)fp->f_data; 859 len = SCARG(uap, valsize); 860 if (len > MCLBYTES) { 861 error = EINVAL; 862 goto out; 863 } 864 if (SCARG(uap, val)) { 865 m = m_get(M_WAIT, MT_SOOPTS); 866 MCLAIM(m, so->so_mowner); 867 if (len > MLEN) 868 m_clget(m, M_WAIT); 869 error = copyin(SCARG(uap, val), mtod(m, caddr_t), len); 870 if (error) { 871 (void) m_free(m); 872 goto out; 873 } 874 m->m_len = SCARG(uap, valsize); 875 } 876 error = sosetopt(so, SCARG(uap, level), SCARG(uap, name), m); 877 out: 878 FILE_UNUSE(fp, p); 879 return (error); 880 } 881 882 /* ARGSUSED */ 883 int 884 sys_getsockopt(struct lwp *l, void *v, register_t *retval) 885 { 886 struct sys_getsockopt_args /* { 887 syscallarg(int) s; 888 syscallarg(int) level; 889 syscallarg(int) name; 890 syscallarg(void *) val; 891 syscallarg(unsigned int *) avalsize; 892 } */ *uap = v; 893 struct proc *p; 894 struct file *fp; 895 struct mbuf *m; 896 unsigned int op, i, valsize; 897 int error; 898 899 p = l->l_proc; 900 m = NULL; 901 /* getsock() will use the descriptor for us */ 902 if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0) 903 return (error); 904 if (SCARG(uap, val)) { 905 error = copyin((caddr_t)SCARG(uap, avalsize), 906 (caddr_t)&valsize, sizeof(valsize)); 907 if (error) 908 goto out; 909 } else 910 valsize = 0; 911 if ((error = sogetopt((struct socket *)fp->f_data, SCARG(uap, level), 912 SCARG(uap, name), &m)) == 0 && SCARG(uap, val) && valsize && 913 m != NULL) { 914 op = 0; 915 while (m && !error && op < valsize) { 916 i = min(m->m_len, (valsize - op)); 917 error = copyout(mtod(m, caddr_t), SCARG(uap, val), i); 918 op += i; 919 SCARG(uap, val) = ((u_int8_t *)SCARG(uap, val)) + i; 920 m = m_free(m); 921 } 922 valsize = op; 923 if (error == 0) 924 error = copyout(&valsize, 925 SCARG(uap, avalsize), sizeof(valsize)); 926 } 927 if (m != NULL) 928 (void) m_freem(m); 929 out: 930 FILE_UNUSE(fp, p); 931 return (error); 932 } 933 934 #ifdef PIPE_SOCKETPAIR 935 /* ARGSUSED */ 936 int 937 sys_pipe(struct lwp *l, void *v, register_t *retval) 938 { 939 struct proc *p; 940 struct filedesc *fdp; 941 struct file *rf, *wf; 942 struct socket *rso, *wso; 943 int fd, error; 944 945 p = l->l_proc; 946 fdp = p->p_fd; 947 if ((error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, p)) != 0) 948 return (error); 949 if ((error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, p)) != 0) 950 goto free1; 951 /* remember this socket pair implements a pipe */ 952 wso->so_state |= SS_ISAPIPE; 953 rso->so_state |= SS_ISAPIPE; 954 /* falloc() will use the descriptor for us */ 955 if ((error = falloc(p, &rf, &fd)) != 0) 956 goto free2; 957 retval[0] = fd; 958 rf->f_flag = FREAD; 959 rf->f_type = DTYPE_SOCKET; 960 rf->f_ops = &socketops; 961 rf->f_data = (caddr_t)rso; 962 if ((error = falloc(p, &wf, &fd)) != 0) 963 goto free3; 964 wf->f_flag = FWRITE; 965 wf->f_type = DTYPE_SOCKET; 966 wf->f_ops = &socketops; 967 wf->f_data = (caddr_t)wso; 968 retval[1] = fd; 969 if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0) 970 goto free4; 971 FILE_SET_MATURE(rf); 972 FILE_SET_MATURE(wf); 973 FILE_UNUSE(rf, p); 974 FILE_UNUSE(wf, p); 975 return (0); 976 free4: 977 FILE_UNUSE(wf, p); 978 ffree(wf); 979 fdremove(fdp, retval[1]); 980 free3: 981 FILE_UNUSE(rf, p); 982 ffree(rf); 983 fdremove(fdp, retval[0]); 984 free2: 985 (void)soclose(wso); 986 free1: 987 (void)soclose(rso); 988 return (error); 989 } 990 #endif /* PIPE_SOCKETPAIR */ 991 992 /* 993 * Get socket name. 994 */ 995 /* ARGSUSED */ 996 int 997 sys_getsockname(struct lwp *l, void *v, register_t *retval) 998 { 999 struct sys_getsockname_args /* { 1000 syscallarg(int) fdes; 1001 syscallarg(struct sockaddr *) asa; 1002 syscallarg(unsigned int *) alen; 1003 } */ *uap = v; 1004 struct proc *p; 1005 struct file *fp; 1006 struct socket *so; 1007 struct mbuf *m; 1008 unsigned int len; 1009 int error; 1010 1011 p = l->l_proc; 1012 /* getsock() will use the descriptor for us */ 1013 if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0) 1014 return (error); 1015 error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof(len)); 1016 if (error) 1017 goto out; 1018 so = (struct socket *)fp->f_data; 1019 m = m_getclr(M_WAIT, MT_SONAME); 1020 MCLAIM(m, so->so_mowner); 1021 error = (*so->so_proto->pr_usrreq)(so, PRU_SOCKADDR, (struct mbuf *)0, 1022 m, (struct mbuf *)0, (struct proc *)0); 1023 if (error) 1024 goto bad; 1025 if (len > m->m_len) 1026 len = m->m_len; 1027 error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len); 1028 if (error == 0) 1029 error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen), 1030 sizeof(len)); 1031 bad: 1032 m_freem(m); 1033 out: 1034 FILE_UNUSE(fp, p); 1035 return (error); 1036 } 1037 1038 /* 1039 * Get name of peer for connected socket. 1040 */ 1041 /* ARGSUSED */ 1042 int 1043 sys_getpeername(struct lwp *l, void *v, register_t *retval) 1044 { 1045 struct sys_getpeername_args /* { 1046 syscallarg(int) fdes; 1047 syscallarg(struct sockaddr *) asa; 1048 syscallarg(unsigned int *) alen; 1049 } */ *uap = v; 1050 struct proc *p; 1051 struct file *fp; 1052 struct socket *so; 1053 struct mbuf *m; 1054 unsigned int len; 1055 int error; 1056 1057 p = l->l_proc; 1058 /* getsock() will use the descriptor for us */ 1059 if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0) 1060 return (error); 1061 so = (struct socket *)fp->f_data; 1062 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1063 error = ENOTCONN; 1064 goto out; 1065 } 1066 error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof(len)); 1067 if (error) 1068 goto out; 1069 m = m_getclr(M_WAIT, MT_SONAME); 1070 MCLAIM(m, so->so_mowner); 1071 error = (*so->so_proto->pr_usrreq)(so, PRU_PEERADDR, (struct mbuf *)0, 1072 m, (struct mbuf *)0, (struct proc *)0); 1073 if (error) 1074 goto bad; 1075 if (len > m->m_len) 1076 len = m->m_len; 1077 error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len); 1078 if (error) 1079 goto bad; 1080 error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen), sizeof(len)); 1081 bad: 1082 m_freem(m); 1083 out: 1084 FILE_UNUSE(fp, p); 1085 return (error); 1086 } 1087 1088 /* 1089 * XXX In a perfect world, we wouldn't pass around socket control 1090 * XXX arguments in mbufs, and this could go away. 1091 */ 1092 int 1093 sockargs(struct mbuf **mp, const void *bf, size_t buflen, int type) 1094 { 1095 struct sockaddr *sa; 1096 struct mbuf *m; 1097 int error; 1098 1099 /* 1100 * We can't allow socket names > UCHAR_MAX in length, since that 1101 * will overflow sa_len. Control data more than a page size in 1102 * length is just too much. 1103 */ 1104 if (buflen > (type == MT_SONAME ? UCHAR_MAX : PAGE_SIZE)) 1105 return (EINVAL); 1106 1107 /* Allocate an mbuf to hold the arguments. */ 1108 m = m_get(M_WAIT, type); 1109 /* can't claim. don't who to assign it to. */ 1110 if (buflen > MLEN) { 1111 /* 1112 * Won't fit into a regular mbuf, so we allocate just 1113 * enough external storage to hold the argument. 1114 */ 1115 MEXTMALLOC(m, buflen, M_WAITOK); 1116 } 1117 m->m_len = buflen; 1118 error = copyin(bf, mtod(m, caddr_t), buflen); 1119 if (error) { 1120 (void) m_free(m); 1121 return (error); 1122 } 1123 *mp = m; 1124 if (type == MT_SONAME) { 1125 sa = mtod(m, struct sockaddr *); 1126 #if BYTE_ORDER != BIG_ENDIAN 1127 /* 1128 * 4.3BSD compat thing - need to stay, since bind(2), 1129 * connect(2), sendto(2) were not versioned for COMPAT_43. 1130 */ 1131 if (sa->sa_family == 0 && sa->sa_len < AF_MAX) 1132 sa->sa_family = sa->sa_len; 1133 #endif 1134 sa->sa_len = buflen; 1135 } 1136 return (0); 1137 } 1138 1139 int 1140 getsock(struct filedesc *fdp, int fdes, struct file **fpp) 1141 { 1142 struct file *fp; 1143 1144 if ((fp = fd_getfile(fdp, fdes)) == NULL) 1145 return (EBADF); 1146 1147 FILE_USE(fp); 1148 1149 if (fp->f_type != DTYPE_SOCKET) { 1150 FILE_UNUSE(fp, NULL); 1151 return (ENOTSOCK); 1152 } 1153 *fpp = fp; 1154 return (0); 1155 }
Cache object: f7a55123ada8a3be354e354f98e1d432
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