1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 8.4 (Berkeley) 2/21/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_capsicum.h" 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_ktrace.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/capsicum.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/sysproto.h> 49 #include <sys/malloc.h> 50 #include <sys/filedesc.h> 51 #include <sys/proc.h> 52 #include <sys/filio.h> 53 #include <sys/jail.h> 54 #include <sys/mbuf.h> 55 #include <sys/protosw.h> 56 #include <sys/rwlock.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/syscallsubr.h> 60 #include <sys/sysent.h> 61 #include <sys/uio.h> 62 #include <sys/un.h> 63 #include <sys/unpcb.h> 64 #ifdef KTRACE 65 #include <sys/ktrace.h> 66 #endif 67 #ifdef COMPAT_FREEBSD32 68 #include <compat/freebsd32/freebsd32_util.h> 69 #endif 70 71 #include <net/vnet.h> 72 73 #include <security/audit/audit.h> 74 #include <security/mac/mac_framework.h> 75 76 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags); 77 static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp); 78 79 static int accept1(struct thread *td, int s, struct sockaddr *uname, 80 socklen_t *anamelen, int flags); 81 static int getsockname1(struct thread *td, struct getsockname_args *uap, 82 int compat); 83 static int getpeername1(struct thread *td, struct getpeername_args *uap, 84 int compat); 85 static int sockargs(struct mbuf **, char *, socklen_t, int); 86 87 /* 88 * Convert a user file descriptor to a kernel file entry and check if required 89 * capability rights are present. 90 * If required copy of current set of capability rights is returned. 91 * A reference on the file entry is held upon returning. 92 */ 93 int 94 getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp, 95 struct file **fpp, u_int *fflagp, struct filecaps *havecapsp) 96 { 97 struct file *fp; 98 int error; 99 100 error = fget_cap(td, fd, rightsp, &fp, havecapsp); 101 if (error != 0) 102 return (error); 103 if (fp->f_type != DTYPE_SOCKET) { 104 fdrop(fp, td); 105 if (havecapsp != NULL) 106 filecaps_free(havecapsp); 107 return (ENOTSOCK); 108 } 109 if (fflagp != NULL) 110 *fflagp = fp->f_flag; 111 *fpp = fp; 112 return (0); 113 } 114 115 /* 116 * System call interface to the socket abstraction. 117 */ 118 #if defined(COMPAT_43) 119 #define COMPAT_OLDSOCK 120 #endif 121 122 int 123 sys_socket(struct thread *td, struct socket_args *uap) 124 { 125 126 return (kern_socket(td, uap->domain, uap->type, uap->protocol)); 127 } 128 129 int 130 kern_socket(struct thread *td, int domain, int type, int protocol) 131 { 132 struct socket *so; 133 struct file *fp; 134 int fd, error, oflag, fflag; 135 136 AUDIT_ARG_SOCKET(domain, type, protocol); 137 138 oflag = 0; 139 fflag = 0; 140 if ((type & SOCK_CLOEXEC) != 0) { 141 type &= ~SOCK_CLOEXEC; 142 oflag |= O_CLOEXEC; 143 } 144 if ((type & SOCK_NONBLOCK) != 0) { 145 type &= ~SOCK_NONBLOCK; 146 fflag |= FNONBLOCK; 147 } 148 149 #ifdef MAC 150 error = mac_socket_check_create(td->td_ucred, domain, type, protocol); 151 if (error != 0) 152 return (error); 153 #endif 154 error = falloc(td, &fp, &fd, oflag); 155 if (error != 0) 156 return (error); 157 /* An extra reference on `fp' has been held for us by falloc(). */ 158 error = socreate(domain, &so, type, protocol, td->td_ucred, td); 159 if (error != 0) { 160 fdclose(td, fp, fd); 161 } else { 162 finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops); 163 if ((fflag & FNONBLOCK) != 0) 164 (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td); 165 td->td_retval[0] = fd; 166 } 167 fdrop(fp, td); 168 return (error); 169 } 170 171 int 172 sys_bind(struct thread *td, struct bind_args *uap) 173 { 174 struct sockaddr *sa; 175 int error; 176 177 error = getsockaddr(&sa, uap->name, uap->namelen); 178 if (error == 0) { 179 error = kern_bindat(td, AT_FDCWD, uap->s, sa); 180 free(sa, M_SONAME); 181 } 182 return (error); 183 } 184 185 int 186 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa) 187 { 188 struct socket *so; 189 struct file *fp; 190 int error; 191 192 #ifdef CAPABILITY_MODE 193 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD)) 194 return (ECAPMODE); 195 #endif 196 197 AUDIT_ARG_FD(fd); 198 AUDIT_ARG_SOCKADDR(td, dirfd, sa); 199 error = getsock_cap(td, fd, &cap_bind_rights, 200 &fp, NULL, NULL); 201 if (error != 0) 202 return (error); 203 so = fp->f_data; 204 #ifdef KTRACE 205 if (KTRPOINT(td, KTR_STRUCT)) 206 ktrsockaddr(sa); 207 #endif 208 #ifdef MAC 209 error = mac_socket_check_bind(td->td_ucred, so, sa); 210 if (error == 0) { 211 #endif 212 if (dirfd == AT_FDCWD) 213 error = sobind(so, sa, td); 214 else 215 error = sobindat(dirfd, so, sa, td); 216 #ifdef MAC 217 } 218 #endif 219 fdrop(fp, td); 220 return (error); 221 } 222 223 int 224 sys_bindat(struct thread *td, struct bindat_args *uap) 225 { 226 struct sockaddr *sa; 227 int error; 228 229 error = getsockaddr(&sa, uap->name, uap->namelen); 230 if (error == 0) { 231 error = kern_bindat(td, uap->fd, uap->s, sa); 232 free(sa, M_SONAME); 233 } 234 return (error); 235 } 236 237 int 238 sys_listen(struct thread *td, struct listen_args *uap) 239 { 240 241 return (kern_listen(td, uap->s, uap->backlog)); 242 } 243 244 int 245 kern_listen(struct thread *td, int s, int backlog) 246 { 247 struct socket *so; 248 struct file *fp; 249 int error; 250 251 AUDIT_ARG_FD(s); 252 error = getsock_cap(td, s, &cap_listen_rights, 253 &fp, NULL, NULL); 254 if (error == 0) { 255 so = fp->f_data; 256 #ifdef MAC 257 error = mac_socket_check_listen(td->td_ucred, so); 258 if (error == 0) 259 #endif 260 error = solisten(so, backlog, td); 261 fdrop(fp, td); 262 } 263 return (error); 264 } 265 266 /* 267 * accept1() 268 */ 269 static int 270 accept1(td, s, uname, anamelen, flags) 271 struct thread *td; 272 int s; 273 struct sockaddr *uname; 274 socklen_t *anamelen; 275 int flags; 276 { 277 struct sockaddr *name; 278 socklen_t namelen; 279 struct file *fp; 280 int error; 281 282 if (uname == NULL) 283 return (kern_accept4(td, s, NULL, NULL, flags, NULL)); 284 285 error = copyin(anamelen, &namelen, sizeof (namelen)); 286 if (error != 0) 287 return (error); 288 289 error = kern_accept4(td, s, &name, &namelen, flags, &fp); 290 291 if (error != 0) 292 return (error); 293 294 if (error == 0 && uname != NULL) { 295 #ifdef COMPAT_OLDSOCK 296 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) && 297 (flags & ACCEPT4_COMPAT) != 0) 298 ((struct osockaddr *)name)->sa_family = 299 name->sa_family; 300 #endif 301 error = copyout(name, uname, namelen); 302 } 303 if (error == 0) 304 error = copyout(&namelen, anamelen, 305 sizeof(namelen)); 306 if (error != 0) 307 fdclose(td, fp, td->td_retval[0]); 308 fdrop(fp, td); 309 free(name, M_SONAME); 310 return (error); 311 } 312 313 int 314 kern_accept(struct thread *td, int s, struct sockaddr **name, 315 socklen_t *namelen, struct file **fp) 316 { 317 return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp)); 318 } 319 320 int 321 kern_accept4(struct thread *td, int s, struct sockaddr **name, 322 socklen_t *namelen, int flags, struct file **fp) 323 { 324 struct file *headfp, *nfp = NULL; 325 struct sockaddr *sa = NULL; 326 struct socket *head, *so; 327 struct filecaps fcaps; 328 u_int fflag; 329 pid_t pgid; 330 int error, fd, tmp; 331 332 if (name != NULL) 333 *name = NULL; 334 335 AUDIT_ARG_FD(s); 336 error = getsock_cap(td, s, &cap_accept_rights, 337 &headfp, &fflag, &fcaps); 338 if (error != 0) 339 return (error); 340 head = headfp->f_data; 341 if (!SOLISTENING(head)) { 342 error = EINVAL; 343 goto done; 344 } 345 #ifdef MAC 346 error = mac_socket_check_accept(td->td_ucred, head); 347 if (error != 0) 348 goto done; 349 #endif 350 error = falloc_caps(td, &nfp, &fd, 351 (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0, &fcaps); 352 if (error != 0) 353 goto done; 354 SOCK_LOCK(head); 355 if (!SOLISTENING(head)) { 356 SOCK_UNLOCK(head); 357 error = EINVAL; 358 goto noconnection; 359 } 360 361 error = solisten_dequeue(head, &so, flags); 362 if (error != 0) 363 goto noconnection; 364 365 /* An extra reference on `nfp' has been held for us by falloc(). */ 366 td->td_retval[0] = fd; 367 368 /* Connection has been removed from the listen queue. */ 369 KNOTE_UNLOCKED(&head->so_rdsel.si_note, 0); 370 371 if (flags & ACCEPT4_INHERIT) { 372 pgid = fgetown(&head->so_sigio); 373 if (pgid != 0) 374 fsetown(pgid, &so->so_sigio); 375 } else { 376 fflag &= ~(FNONBLOCK | FASYNC); 377 if (flags & SOCK_NONBLOCK) 378 fflag |= FNONBLOCK; 379 } 380 381 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 382 /* Sync socket nonblocking/async state with file flags */ 383 tmp = fflag & FNONBLOCK; 384 (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td); 385 tmp = fflag & FASYNC; 386 (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td); 387 error = soaccept(so, &sa); 388 if (error != 0) 389 goto noconnection; 390 if (sa == NULL) { 391 if (name) 392 *namelen = 0; 393 goto done; 394 } 395 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa); 396 if (name) { 397 /* check sa_len before it is destroyed */ 398 if (*namelen > sa->sa_len) 399 *namelen = sa->sa_len; 400 #ifdef KTRACE 401 if (KTRPOINT(td, KTR_STRUCT)) 402 ktrsockaddr(sa); 403 #endif 404 *name = sa; 405 sa = NULL; 406 } 407 noconnection: 408 free(sa, M_SONAME); 409 410 /* 411 * close the new descriptor, assuming someone hasn't ripped it 412 * out from under us. 413 */ 414 if (error != 0) 415 fdclose(td, nfp, fd); 416 417 /* 418 * Release explicitly held references before returning. We return 419 * a reference on nfp to the caller on success if they request it. 420 */ 421 done: 422 if (nfp == NULL) 423 filecaps_free(&fcaps); 424 if (fp != NULL) { 425 if (error == 0) { 426 *fp = nfp; 427 nfp = NULL; 428 } else 429 *fp = NULL; 430 } 431 if (nfp != NULL) 432 fdrop(nfp, td); 433 fdrop(headfp, td); 434 return (error); 435 } 436 437 int 438 sys_accept(td, uap) 439 struct thread *td; 440 struct accept_args *uap; 441 { 442 443 return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT)); 444 } 445 446 int 447 sys_accept4(td, uap) 448 struct thread *td; 449 struct accept4_args *uap; 450 { 451 452 if (uap->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 453 return (EINVAL); 454 455 return (accept1(td, uap->s, uap->name, uap->anamelen, uap->flags)); 456 } 457 458 #ifdef COMPAT_OLDSOCK 459 int 460 oaccept(struct thread *td, struct oaccept_args *uap) 461 { 462 463 return (accept1(td, uap->s, uap->name, uap->anamelen, 464 ACCEPT4_INHERIT | ACCEPT4_COMPAT)); 465 } 466 #endif /* COMPAT_OLDSOCK */ 467 468 int 469 sys_connect(struct thread *td, struct connect_args *uap) 470 { 471 struct sockaddr *sa; 472 int error; 473 474 error = getsockaddr(&sa, uap->name, uap->namelen); 475 if (error == 0) { 476 error = kern_connectat(td, AT_FDCWD, uap->s, sa); 477 free(sa, M_SONAME); 478 } 479 return (error); 480 } 481 482 int 483 kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa) 484 { 485 struct socket *so; 486 struct file *fp; 487 int error, interrupted = 0; 488 489 #ifdef CAPABILITY_MODE 490 if (IN_CAPABILITY_MODE(td) && (dirfd == AT_FDCWD)) 491 return (ECAPMODE); 492 #endif 493 494 AUDIT_ARG_FD(fd); 495 AUDIT_ARG_SOCKADDR(td, dirfd, sa); 496 error = getsock_cap(td, fd, &cap_connect_rights, 497 &fp, NULL, NULL); 498 if (error != 0) 499 return (error); 500 so = fp->f_data; 501 if (so->so_state & SS_ISCONNECTING) { 502 error = EALREADY; 503 goto done1; 504 } 505 #ifdef KTRACE 506 if (KTRPOINT(td, KTR_STRUCT)) 507 ktrsockaddr(sa); 508 #endif 509 #ifdef MAC 510 error = mac_socket_check_connect(td->td_ucred, so, sa); 511 if (error != 0) 512 goto bad; 513 #endif 514 if (dirfd == AT_FDCWD) 515 error = soconnect(so, sa, td); 516 else 517 error = soconnectat(dirfd, so, sa, td); 518 if (error != 0) 519 goto bad; 520 if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { 521 error = EINPROGRESS; 522 goto done1; 523 } 524 SOCK_LOCK(so); 525 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 526 error = msleep(&so->so_timeo, &so->so_lock, PSOCK | PCATCH, 527 "connec", 0); 528 if (error != 0) { 529 if (error == EINTR || error == ERESTART) 530 interrupted = 1; 531 break; 532 } 533 } 534 if (error == 0) { 535 error = so->so_error; 536 so->so_error = 0; 537 } 538 SOCK_UNLOCK(so); 539 bad: 540 if (!interrupted) 541 so->so_state &= ~SS_ISCONNECTING; 542 if (error == ERESTART) 543 error = EINTR; 544 done1: 545 fdrop(fp, td); 546 return (error); 547 } 548 549 int 550 sys_connectat(struct thread *td, struct connectat_args *uap) 551 { 552 struct sockaddr *sa; 553 int error; 554 555 error = getsockaddr(&sa, uap->name, uap->namelen); 556 if (error == 0) { 557 error = kern_connectat(td, uap->fd, uap->s, sa); 558 free(sa, M_SONAME); 559 } 560 return (error); 561 } 562 563 int 564 kern_socketpair(struct thread *td, int domain, int type, int protocol, 565 int *rsv) 566 { 567 struct file *fp1, *fp2; 568 struct socket *so1, *so2; 569 int fd, error, oflag, fflag; 570 571 AUDIT_ARG_SOCKET(domain, type, protocol); 572 573 oflag = 0; 574 fflag = 0; 575 if ((type & SOCK_CLOEXEC) != 0) { 576 type &= ~SOCK_CLOEXEC; 577 oflag |= O_CLOEXEC; 578 } 579 if ((type & SOCK_NONBLOCK) != 0) { 580 type &= ~SOCK_NONBLOCK; 581 fflag |= FNONBLOCK; 582 } 583 #ifdef MAC 584 /* We might want to have a separate check for socket pairs. */ 585 error = mac_socket_check_create(td->td_ucred, domain, type, 586 protocol); 587 if (error != 0) 588 return (error); 589 #endif 590 error = socreate(domain, &so1, type, protocol, td->td_ucred, td); 591 if (error != 0) 592 return (error); 593 error = socreate(domain, &so2, type, protocol, td->td_ucred, td); 594 if (error != 0) 595 goto free1; 596 /* On success extra reference to `fp1' and 'fp2' is set by falloc. */ 597 error = falloc(td, &fp1, &fd, oflag); 598 if (error != 0) 599 goto free2; 600 rsv[0] = fd; 601 fp1->f_data = so1; /* so1 already has ref count */ 602 error = falloc(td, &fp2, &fd, oflag); 603 if (error != 0) 604 goto free3; 605 fp2->f_data = so2; /* so2 already has ref count */ 606 rsv[1] = fd; 607 error = soconnect2(so1, so2); 608 if (error != 0) 609 goto free4; 610 if (type == SOCK_DGRAM) { 611 /* 612 * Datagram socket connection is asymmetric. 613 */ 614 error = soconnect2(so2, so1); 615 if (error != 0) 616 goto free4; 617 } else if (so1->so_proto->pr_flags & PR_CONNREQUIRED) { 618 struct unpcb *unp, *unp2; 619 unp = sotounpcb(so1); 620 unp2 = sotounpcb(so2); 621 /* 622 * No need to lock the unps, because the sockets are brand-new. 623 * No other threads can be using them yet 624 */ 625 unp_copy_peercred(td, unp, unp2, unp); 626 } 627 finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data, 628 &socketops); 629 finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data, 630 &socketops); 631 if ((fflag & FNONBLOCK) != 0) { 632 (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td); 633 (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td); 634 } 635 fdrop(fp1, td); 636 fdrop(fp2, td); 637 return (0); 638 free4: 639 fdclose(td, fp2, rsv[1]); 640 fdrop(fp2, td); 641 free3: 642 fdclose(td, fp1, rsv[0]); 643 fdrop(fp1, td); 644 free2: 645 if (so2 != NULL) 646 (void)soclose(so2); 647 free1: 648 if (so1 != NULL) 649 (void)soclose(so1); 650 return (error); 651 } 652 653 int 654 sys_socketpair(struct thread *td, struct socketpair_args *uap) 655 { 656 int error, sv[2]; 657 658 error = kern_socketpair(td, uap->domain, uap->type, 659 uap->protocol, sv); 660 if (error != 0) 661 return (error); 662 error = copyout(sv, uap->rsv, 2 * sizeof(int)); 663 if (error != 0) { 664 (void)kern_close(td, sv[0]); 665 (void)kern_close(td, sv[1]); 666 } 667 return (error); 668 } 669 670 static int 671 sendit(struct thread *td, int s, struct msghdr *mp, int flags) 672 { 673 struct mbuf *control; 674 struct sockaddr *to; 675 int error; 676 677 #ifdef CAPABILITY_MODE 678 if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL)) 679 return (ECAPMODE); 680 #endif 681 682 if (mp->msg_name != NULL) { 683 error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); 684 if (error != 0) { 685 to = NULL; 686 goto bad; 687 } 688 mp->msg_name = to; 689 } else { 690 to = NULL; 691 } 692 693 if (mp->msg_control) { 694 if (mp->msg_controllen < sizeof(struct cmsghdr) 695 #ifdef COMPAT_OLDSOCK 696 && (mp->msg_flags != MSG_COMPAT || 697 !SV_PROC_FLAG(td->td_proc, SV_AOUT)) 698 #endif 699 ) { 700 error = EINVAL; 701 goto bad; 702 } 703 error = sockargs(&control, mp->msg_control, 704 mp->msg_controllen, MT_CONTROL); 705 if (error != 0) 706 goto bad; 707 #ifdef COMPAT_OLDSOCK 708 if (mp->msg_flags == MSG_COMPAT && 709 SV_PROC_FLAG(td->td_proc, SV_AOUT)) { 710 struct cmsghdr *cm; 711 712 M_PREPEND(control, sizeof(*cm), M_WAITOK); 713 cm = mtod(control, struct cmsghdr *); 714 cm->cmsg_len = control->m_len; 715 cm->cmsg_level = SOL_SOCKET; 716 cm->cmsg_type = SCM_RIGHTS; 717 } 718 #endif 719 } else { 720 control = NULL; 721 } 722 723 error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE); 724 725 bad: 726 free(to, M_SONAME); 727 return (error); 728 } 729 730 int 731 kern_sendit(struct thread *td, int s, struct msghdr *mp, int flags, 732 struct mbuf *control, enum uio_seg segflg) 733 { 734 struct file *fp; 735 struct uio auio; 736 struct iovec *iov; 737 struct socket *so; 738 cap_rights_t *rights; 739 #ifdef KTRACE 740 struct uio *ktruio = NULL; 741 #endif 742 ssize_t len; 743 int i, error; 744 745 AUDIT_ARG_FD(s); 746 rights = &cap_send_rights; 747 if (mp->msg_name != NULL) { 748 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name); 749 rights = &cap_send_connect_rights; 750 } 751 error = getsock_cap(td, s, rights, &fp, NULL, NULL); 752 if (error != 0) { 753 m_freem(control); 754 return (error); 755 } 756 so = (struct socket *)fp->f_data; 757 758 #ifdef KTRACE 759 if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT)) 760 ktrsockaddr(mp->msg_name); 761 #endif 762 #ifdef MAC 763 if (mp->msg_name != NULL) { 764 error = mac_socket_check_connect(td->td_ucred, so, 765 mp->msg_name); 766 if (error != 0) { 767 m_freem(control); 768 goto bad; 769 } 770 } 771 error = mac_socket_check_send(td->td_ucred, so); 772 if (error != 0) { 773 m_freem(control); 774 goto bad; 775 } 776 #endif 777 778 auio.uio_iov = mp->msg_iov; 779 auio.uio_iovcnt = mp->msg_iovlen; 780 auio.uio_segflg = segflg; 781 auio.uio_rw = UIO_WRITE; 782 auio.uio_td = td; 783 auio.uio_offset = 0; /* XXX */ 784 auio.uio_resid = 0; 785 iov = mp->msg_iov; 786 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 787 if ((auio.uio_resid += iov->iov_len) < 0) { 788 error = EINVAL; 789 m_freem(control); 790 goto bad; 791 } 792 } 793 #ifdef KTRACE 794 if (KTRPOINT(td, KTR_GENIO)) 795 ktruio = cloneuio(&auio); 796 #endif 797 len = auio.uio_resid; 798 error = sosend(so, mp->msg_name, &auio, 0, control, flags, td); 799 if (error != 0) { 800 if (auio.uio_resid != len && (error == ERESTART || 801 error == EINTR || error == EWOULDBLOCK)) 802 error = 0; 803 /* Generation of SIGPIPE can be controlled per socket */ 804 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 805 !(flags & MSG_NOSIGNAL)) { 806 PROC_LOCK(td->td_proc); 807 tdsignal(td, SIGPIPE); 808 PROC_UNLOCK(td->td_proc); 809 } 810 } 811 if (error == 0) 812 td->td_retval[0] = len - auio.uio_resid; 813 #ifdef KTRACE 814 if (ktruio != NULL) { 815 ktruio->uio_resid = td->td_retval[0]; 816 ktrgenio(s, UIO_WRITE, ktruio, error); 817 } 818 #endif 819 bad: 820 fdrop(fp, td); 821 return (error); 822 } 823 824 int 825 sys_sendto(struct thread *td, struct sendto_args *uap) 826 { 827 struct msghdr msg; 828 struct iovec aiov; 829 830 msg.msg_name = __DECONST(void *, uap->to); 831 msg.msg_namelen = uap->tolen; 832 msg.msg_iov = &aiov; 833 msg.msg_iovlen = 1; 834 msg.msg_control = 0; 835 #ifdef COMPAT_OLDSOCK 836 if (SV_PROC_FLAG(td->td_proc, SV_AOUT)) 837 msg.msg_flags = 0; 838 #endif 839 aiov.iov_base = __DECONST(void *, uap->buf); 840 aiov.iov_len = uap->len; 841 return (sendit(td, uap->s, &msg, uap->flags)); 842 } 843 844 #ifdef COMPAT_OLDSOCK 845 int 846 osend(struct thread *td, struct osend_args *uap) 847 { 848 struct msghdr msg; 849 struct iovec aiov; 850 851 msg.msg_name = 0; 852 msg.msg_namelen = 0; 853 msg.msg_iov = &aiov; 854 msg.msg_iovlen = 1; 855 aiov.iov_base = __DECONST(void *, uap->buf); 856 aiov.iov_len = uap->len; 857 msg.msg_control = 0; 858 msg.msg_flags = 0; 859 return (sendit(td, uap->s, &msg, uap->flags)); 860 } 861 862 int 863 osendmsg(struct thread *td, struct osendmsg_args *uap) 864 { 865 struct msghdr msg; 866 struct iovec *iov; 867 int error; 868 869 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 870 if (error != 0) 871 return (error); 872 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 873 if (error != 0) 874 return (error); 875 msg.msg_iov = iov; 876 msg.msg_flags = MSG_COMPAT; 877 error = sendit(td, uap->s, &msg, uap->flags); 878 free(iov, M_IOV); 879 return (error); 880 } 881 #endif 882 883 int 884 sys_sendmsg(struct thread *td, struct sendmsg_args *uap) 885 { 886 struct msghdr msg; 887 struct iovec *iov; 888 int error; 889 890 error = copyin(uap->msg, &msg, sizeof (msg)); 891 if (error != 0) 892 return (error); 893 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 894 if (error != 0) 895 return (error); 896 msg.msg_iov = iov; 897 #ifdef COMPAT_OLDSOCK 898 if (SV_PROC_FLAG(td->td_proc, SV_AOUT)) 899 msg.msg_flags = 0; 900 #endif 901 error = sendit(td, uap->s, &msg, uap->flags); 902 free(iov, M_IOV); 903 return (error); 904 } 905 906 int 907 kern_recvit(struct thread *td, int s, struct msghdr *mp, enum uio_seg fromseg, 908 struct mbuf **controlp) 909 { 910 struct uio auio; 911 struct iovec *iov; 912 struct mbuf *control, *m; 913 caddr_t ctlbuf; 914 struct file *fp; 915 struct socket *so; 916 struct sockaddr *fromsa = NULL; 917 #ifdef KTRACE 918 struct uio *ktruio = NULL; 919 #endif 920 ssize_t len; 921 int error, i; 922 923 if (controlp != NULL) 924 *controlp = NULL; 925 926 AUDIT_ARG_FD(s); 927 error = getsock_cap(td, s, &cap_recv_rights, 928 &fp, NULL, NULL); 929 if (error != 0) 930 return (error); 931 so = fp->f_data; 932 933 #ifdef MAC 934 error = mac_socket_check_receive(td->td_ucred, so); 935 if (error != 0) { 936 fdrop(fp, td); 937 return (error); 938 } 939 #endif 940 941 auio.uio_iov = mp->msg_iov; 942 auio.uio_iovcnt = mp->msg_iovlen; 943 auio.uio_segflg = UIO_USERSPACE; 944 auio.uio_rw = UIO_READ; 945 auio.uio_td = td; 946 auio.uio_offset = 0; /* XXX */ 947 auio.uio_resid = 0; 948 iov = mp->msg_iov; 949 for (i = 0; i < mp->msg_iovlen; i++, iov++) { 950 if ((auio.uio_resid += iov->iov_len) < 0) { 951 fdrop(fp, td); 952 return (EINVAL); 953 } 954 } 955 #ifdef KTRACE 956 if (KTRPOINT(td, KTR_GENIO)) 957 ktruio = cloneuio(&auio); 958 #endif 959 control = NULL; 960 len = auio.uio_resid; 961 error = soreceive(so, &fromsa, &auio, NULL, 962 (mp->msg_control || controlp) ? &control : NULL, 963 &mp->msg_flags); 964 if (error != 0) { 965 if (auio.uio_resid != len && (error == ERESTART || 966 error == EINTR || error == EWOULDBLOCK)) 967 error = 0; 968 } 969 if (fromsa != NULL) 970 AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa); 971 #ifdef KTRACE 972 if (ktruio != NULL) { 973 ktruio->uio_resid = len - auio.uio_resid; 974 ktrgenio(s, UIO_READ, ktruio, error); 975 } 976 #endif 977 if (error != 0) 978 goto out; 979 td->td_retval[0] = len - auio.uio_resid; 980 if (mp->msg_name) { 981 len = mp->msg_namelen; 982 if (len <= 0 || fromsa == NULL) 983 len = 0; 984 else { 985 /* save sa_len before it is destroyed by MSG_COMPAT */ 986 len = MIN(len, fromsa->sa_len); 987 #ifdef COMPAT_OLDSOCK 988 if ((mp->msg_flags & MSG_COMPAT) != 0 && 989 SV_PROC_FLAG(td->td_proc, SV_AOUT)) 990 ((struct osockaddr *)fromsa)->sa_family = 991 fromsa->sa_family; 992 #endif 993 if (fromseg == UIO_USERSPACE) { 994 error = copyout(fromsa, mp->msg_name, 995 (unsigned)len); 996 if (error != 0) 997 goto out; 998 } else 999 bcopy(fromsa, mp->msg_name, len); 1000 } 1001 mp->msg_namelen = len; 1002 } 1003 if (mp->msg_control && controlp == NULL) { 1004 #ifdef COMPAT_OLDSOCK 1005 /* 1006 * We assume that old recvmsg calls won't receive access 1007 * rights and other control info, esp. as control info 1008 * is always optional and those options didn't exist in 4.3. 1009 * If we receive rights, trim the cmsghdr; anything else 1010 * is tossed. 1011 */ 1012 if (control && (mp->msg_flags & MSG_COMPAT) != 0 && 1013 SV_PROC_FLAG(td->td_proc, SV_AOUT)) { 1014 if (mtod(control, struct cmsghdr *)->cmsg_level != 1015 SOL_SOCKET || 1016 mtod(control, struct cmsghdr *)->cmsg_type != 1017 SCM_RIGHTS) { 1018 mp->msg_controllen = 0; 1019 goto out; 1020 } 1021 control->m_len -= sizeof (struct cmsghdr); 1022 control->m_data += sizeof (struct cmsghdr); 1023 } 1024 #endif 1025 ctlbuf = mp->msg_control; 1026 len = mp->msg_controllen; 1027 mp->msg_controllen = 0; 1028 for (m = control; m != NULL && len >= m->m_len; m = m->m_next) { 1029 if ((error = copyout(mtod(m, caddr_t), ctlbuf, 1030 m->m_len)) != 0) 1031 goto out; 1032 1033 ctlbuf += m->m_len; 1034 len -= m->m_len; 1035 mp->msg_controllen += m->m_len; 1036 } 1037 if (m != NULL) { 1038 mp->msg_flags |= MSG_CTRUNC; 1039 m_dispose_extcontrolm(m); 1040 } 1041 } 1042 out: 1043 fdrop(fp, td); 1044 #ifdef KTRACE 1045 if (fromsa && KTRPOINT(td, KTR_STRUCT)) 1046 ktrsockaddr(fromsa); 1047 #endif 1048 free(fromsa, M_SONAME); 1049 1050 if (error == 0 && controlp != NULL) 1051 *controlp = control; 1052 else if (control != NULL) { 1053 if (error != 0) 1054 m_dispose_extcontrolm(control); 1055 m_freem(control); 1056 } 1057 1058 return (error); 1059 } 1060 1061 static int 1062 recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp) 1063 { 1064 int error; 1065 1066 error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL); 1067 if (error != 0) 1068 return (error); 1069 if (namelenp != NULL) { 1070 error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t)); 1071 #ifdef COMPAT_OLDSOCK 1072 if ((mp->msg_flags & MSG_COMPAT) != 0 && 1073 SV_PROC_FLAG(td->td_proc, SV_AOUT)) 1074 error = 0; /* old recvfrom didn't check */ 1075 #endif 1076 } 1077 return (error); 1078 } 1079 1080 int 1081 sys_recvfrom(struct thread *td, struct recvfrom_args *uap) 1082 { 1083 struct msghdr msg; 1084 struct iovec aiov; 1085 int error; 1086 1087 if (uap->fromlenaddr) { 1088 error = copyin(uap->fromlenaddr, 1089 &msg.msg_namelen, sizeof (msg.msg_namelen)); 1090 if (error != 0) 1091 goto done2; 1092 } else { 1093 msg.msg_namelen = 0; 1094 } 1095 msg.msg_name = uap->from; 1096 msg.msg_iov = &aiov; 1097 msg.msg_iovlen = 1; 1098 aiov.iov_base = uap->buf; 1099 aiov.iov_len = uap->len; 1100 msg.msg_control = 0; 1101 msg.msg_flags = uap->flags; 1102 error = recvit(td, uap->s, &msg, uap->fromlenaddr); 1103 done2: 1104 return (error); 1105 } 1106 1107 #ifdef COMPAT_OLDSOCK 1108 int 1109 orecvfrom(struct thread *td, struct recvfrom_args *uap) 1110 { 1111 1112 uap->flags |= MSG_COMPAT; 1113 return (sys_recvfrom(td, uap)); 1114 } 1115 #endif 1116 1117 #ifdef COMPAT_OLDSOCK 1118 int 1119 orecv(struct thread *td, struct orecv_args *uap) 1120 { 1121 struct msghdr msg; 1122 struct iovec aiov; 1123 1124 msg.msg_name = 0; 1125 msg.msg_namelen = 0; 1126 msg.msg_iov = &aiov; 1127 msg.msg_iovlen = 1; 1128 aiov.iov_base = uap->buf; 1129 aiov.iov_len = uap->len; 1130 msg.msg_control = 0; 1131 msg.msg_flags = uap->flags; 1132 return (recvit(td, uap->s, &msg, NULL)); 1133 } 1134 1135 /* 1136 * Old recvmsg. This code takes advantage of the fact that the old msghdr 1137 * overlays the new one, missing only the flags, and with the (old) access 1138 * rights where the control fields are now. 1139 */ 1140 int 1141 orecvmsg(struct thread *td, struct orecvmsg_args *uap) 1142 { 1143 struct msghdr msg; 1144 struct iovec *iov; 1145 int error; 1146 1147 error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); 1148 if (error != 0) 1149 return (error); 1150 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 1151 if (error != 0) 1152 return (error); 1153 msg.msg_flags = uap->flags | MSG_COMPAT; 1154 msg.msg_iov = iov; 1155 error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen); 1156 if (msg.msg_controllen && error == 0) 1157 error = copyout(&msg.msg_controllen, 1158 &uap->msg->msg_accrightslen, sizeof (int)); 1159 free(iov, M_IOV); 1160 return (error); 1161 } 1162 #endif 1163 1164 int 1165 sys_recvmsg(struct thread *td, struct recvmsg_args *uap) 1166 { 1167 struct msghdr msg; 1168 struct iovec *uiov, *iov; 1169 int error; 1170 1171 error = copyin(uap->msg, &msg, sizeof (msg)); 1172 if (error != 0) 1173 return (error); 1174 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 1175 if (error != 0) 1176 return (error); 1177 msg.msg_flags = uap->flags; 1178 #ifdef COMPAT_OLDSOCK 1179 if (SV_PROC_FLAG(td->td_proc, SV_AOUT)) 1180 msg.msg_flags &= ~MSG_COMPAT; 1181 #endif 1182 uiov = msg.msg_iov; 1183 msg.msg_iov = iov; 1184 error = recvit(td, uap->s, &msg, NULL); 1185 if (error == 0) { 1186 msg.msg_iov = uiov; 1187 error = copyout(&msg, uap->msg, sizeof(msg)); 1188 } 1189 free(iov, M_IOV); 1190 return (error); 1191 } 1192 1193 int 1194 sys_shutdown(struct thread *td, struct shutdown_args *uap) 1195 { 1196 1197 return (kern_shutdown(td, uap->s, uap->how)); 1198 } 1199 1200 int 1201 kern_shutdown(struct thread *td, int s, int how) 1202 { 1203 struct socket *so; 1204 struct file *fp; 1205 int error; 1206 1207 AUDIT_ARG_FD(s); 1208 error = getsock_cap(td, s, &cap_shutdown_rights, 1209 &fp, NULL, NULL); 1210 if (error == 0) { 1211 so = fp->f_data; 1212 error = soshutdown(so, how); 1213 /* 1214 * Previous versions did not return ENOTCONN, but 0 in 1215 * case the socket was not connected. Some important 1216 * programs like syslogd up to r279016, 2015-02-19, 1217 * still depend on this behavior. 1218 */ 1219 if (error == ENOTCONN && 1220 td->td_proc->p_osrel < P_OSREL_SHUTDOWN_ENOTCONN) 1221 error = 0; 1222 fdrop(fp, td); 1223 } 1224 return (error); 1225 } 1226 1227 int 1228 sys_setsockopt(struct thread *td, struct setsockopt_args *uap) 1229 { 1230 1231 return (kern_setsockopt(td, uap->s, uap->level, uap->name, 1232 uap->val, UIO_USERSPACE, uap->valsize)); 1233 } 1234 1235 int 1236 kern_setsockopt(struct thread *td, int s, int level, int name, const void *val, 1237 enum uio_seg valseg, socklen_t valsize) 1238 { 1239 struct socket *so; 1240 struct file *fp; 1241 struct sockopt sopt; 1242 int error; 1243 1244 if (val == NULL && valsize != 0) 1245 return (EFAULT); 1246 if ((int)valsize < 0) 1247 return (EINVAL); 1248 1249 sopt.sopt_dir = SOPT_SET; 1250 sopt.sopt_level = level; 1251 sopt.sopt_name = name; 1252 sopt.sopt_val = __DECONST(void *, val); 1253 sopt.sopt_valsize = valsize; 1254 switch (valseg) { 1255 case UIO_USERSPACE: 1256 sopt.sopt_td = td; 1257 break; 1258 case UIO_SYSSPACE: 1259 sopt.sopt_td = NULL; 1260 break; 1261 default: 1262 panic("kern_setsockopt called with bad valseg"); 1263 } 1264 1265 AUDIT_ARG_FD(s); 1266 error = getsock_cap(td, s, &cap_setsockopt_rights, 1267 &fp, NULL, NULL); 1268 if (error == 0) { 1269 so = fp->f_data; 1270 error = sosetopt(so, &sopt); 1271 fdrop(fp, td); 1272 } 1273 return(error); 1274 } 1275 1276 int 1277 sys_getsockopt(struct thread *td, struct getsockopt_args *uap) 1278 { 1279 socklen_t valsize; 1280 int error; 1281 1282 if (uap->val) { 1283 error = copyin(uap->avalsize, &valsize, sizeof (valsize)); 1284 if (error != 0) 1285 return (error); 1286 } 1287 1288 error = kern_getsockopt(td, uap->s, uap->level, uap->name, 1289 uap->val, UIO_USERSPACE, &valsize); 1290 1291 if (error == 0) 1292 error = copyout(&valsize, uap->avalsize, sizeof (valsize)); 1293 return (error); 1294 } 1295 1296 /* 1297 * Kernel version of getsockopt. 1298 * optval can be a userland or userspace. optlen is always a kernel pointer. 1299 */ 1300 int 1301 kern_getsockopt(struct thread *td, int s, int level, int name, void *val, 1302 enum uio_seg valseg, socklen_t *valsize) 1303 { 1304 struct socket *so; 1305 struct file *fp; 1306 struct sockopt sopt; 1307 int error; 1308 1309 if (val == NULL) 1310 *valsize = 0; 1311 if ((int)*valsize < 0) 1312 return (EINVAL); 1313 1314 sopt.sopt_dir = SOPT_GET; 1315 sopt.sopt_level = level; 1316 sopt.sopt_name = name; 1317 sopt.sopt_val = val; 1318 sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */ 1319 switch (valseg) { 1320 case UIO_USERSPACE: 1321 sopt.sopt_td = td; 1322 break; 1323 case UIO_SYSSPACE: 1324 sopt.sopt_td = NULL; 1325 break; 1326 default: 1327 panic("kern_getsockopt called with bad valseg"); 1328 } 1329 1330 AUDIT_ARG_FD(s); 1331 error = getsock_cap(td, s, &cap_getsockopt_rights, 1332 &fp, NULL, NULL); 1333 if (error == 0) { 1334 so = fp->f_data; 1335 error = sogetopt(so, &sopt); 1336 *valsize = sopt.sopt_valsize; 1337 fdrop(fp, td); 1338 } 1339 return (error); 1340 } 1341 1342 /* 1343 * getsockname1() - Get socket name. 1344 */ 1345 static int 1346 getsockname1(struct thread *td, struct getsockname_args *uap, int compat) 1347 { 1348 struct sockaddr *sa; 1349 socklen_t len; 1350 int error; 1351 1352 error = copyin(uap->alen, &len, sizeof(len)); 1353 if (error != 0) 1354 return (error); 1355 1356 error = kern_getsockname(td, uap->fdes, &sa, &len); 1357 if (error != 0) 1358 return (error); 1359 1360 if (len != 0) { 1361 #ifdef COMPAT_OLDSOCK 1362 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT)) 1363 ((struct osockaddr *)sa)->sa_family = sa->sa_family; 1364 #endif 1365 error = copyout(sa, uap->asa, (u_int)len); 1366 } 1367 free(sa, M_SONAME); 1368 if (error == 0) 1369 error = copyout(&len, uap->alen, sizeof(len)); 1370 return (error); 1371 } 1372 1373 int 1374 kern_getsockname(struct thread *td, int fd, struct sockaddr **sa, 1375 socklen_t *alen) 1376 { 1377 struct socket *so; 1378 struct file *fp; 1379 socklen_t len; 1380 int error; 1381 1382 AUDIT_ARG_FD(fd); 1383 error = getsock_cap(td, fd, &cap_getsockname_rights, 1384 &fp, NULL, NULL); 1385 if (error != 0) 1386 return (error); 1387 so = fp->f_data; 1388 *sa = NULL; 1389 CURVNET_SET(so->so_vnet); 1390 error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa); 1391 CURVNET_RESTORE(); 1392 if (error != 0) 1393 goto bad; 1394 if (*sa == NULL) 1395 len = 0; 1396 else 1397 len = MIN(*alen, (*sa)->sa_len); 1398 *alen = len; 1399 #ifdef KTRACE 1400 if (KTRPOINT(td, KTR_STRUCT)) 1401 ktrsockaddr(*sa); 1402 #endif 1403 bad: 1404 fdrop(fp, td); 1405 if (error != 0 && *sa != NULL) { 1406 free(*sa, M_SONAME); 1407 *sa = NULL; 1408 } 1409 return (error); 1410 } 1411 1412 int 1413 sys_getsockname(struct thread *td, struct getsockname_args *uap) 1414 { 1415 1416 return (getsockname1(td, uap, 0)); 1417 } 1418 1419 #ifdef COMPAT_OLDSOCK 1420 int 1421 ogetsockname(struct thread *td, struct getsockname_args *uap) 1422 { 1423 1424 return (getsockname1(td, uap, 1)); 1425 } 1426 #endif /* COMPAT_OLDSOCK */ 1427 1428 /* 1429 * getpeername1() - Get name of peer for connected socket. 1430 */ 1431 static int 1432 getpeername1(struct thread *td, struct getpeername_args *uap, int compat) 1433 { 1434 struct sockaddr *sa; 1435 socklen_t len; 1436 int error; 1437 1438 error = copyin(uap->alen, &len, sizeof (len)); 1439 if (error != 0) 1440 return (error); 1441 1442 error = kern_getpeername(td, uap->fdes, &sa, &len); 1443 if (error != 0) 1444 return (error); 1445 1446 if (len != 0) { 1447 #ifdef COMPAT_OLDSOCK 1448 if (compat && SV_PROC_FLAG(td->td_proc, SV_AOUT)) 1449 ((struct osockaddr *)sa)->sa_family = sa->sa_family; 1450 #endif 1451 error = copyout(sa, uap->asa, (u_int)len); 1452 } 1453 free(sa, M_SONAME); 1454 if (error == 0) 1455 error = copyout(&len, uap->alen, sizeof(len)); 1456 return (error); 1457 } 1458 1459 int 1460 kern_getpeername(struct thread *td, int fd, struct sockaddr **sa, 1461 socklen_t *alen) 1462 { 1463 struct socket *so; 1464 struct file *fp; 1465 socklen_t len; 1466 int error; 1467 1468 AUDIT_ARG_FD(fd); 1469 error = getsock_cap(td, fd, &cap_getpeername_rights, 1470 &fp, NULL, NULL); 1471 if (error != 0) 1472 return (error); 1473 so = fp->f_data; 1474 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 1475 error = ENOTCONN; 1476 goto done; 1477 } 1478 *sa = NULL; 1479 CURVNET_SET(so->so_vnet); 1480 error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa); 1481 CURVNET_RESTORE(); 1482 if (error != 0) 1483 goto bad; 1484 if (*sa == NULL) 1485 len = 0; 1486 else 1487 len = MIN(*alen, (*sa)->sa_len); 1488 *alen = len; 1489 #ifdef KTRACE 1490 if (KTRPOINT(td, KTR_STRUCT)) 1491 ktrsockaddr(*sa); 1492 #endif 1493 bad: 1494 if (error != 0 && *sa != NULL) { 1495 free(*sa, M_SONAME); 1496 *sa = NULL; 1497 } 1498 done: 1499 fdrop(fp, td); 1500 return (error); 1501 } 1502 1503 int 1504 sys_getpeername(struct thread *td, struct getpeername_args *uap) 1505 { 1506 1507 return (getpeername1(td, uap, 0)); 1508 } 1509 1510 #ifdef COMPAT_OLDSOCK 1511 int 1512 ogetpeername(struct thread *td, struct ogetpeername_args *uap) 1513 { 1514 1515 /* XXX uap should have type `getpeername_args *' to begin with. */ 1516 return (getpeername1(td, (struct getpeername_args *)uap, 1)); 1517 } 1518 #endif /* COMPAT_OLDSOCK */ 1519 1520 static int 1521 sockargs(struct mbuf **mp, char *buf, socklen_t buflen, int type) 1522 { 1523 struct sockaddr *sa; 1524 struct mbuf *m; 1525 int error; 1526 1527 if (buflen > MLEN) { 1528 #ifdef COMPAT_OLDSOCK 1529 if (type == MT_SONAME && buflen <= 112 && 1530 SV_CURPROC_FLAG(SV_AOUT)) 1531 buflen = MLEN; /* unix domain compat. hack */ 1532 else 1533 #endif 1534 if (buflen > MCLBYTES) 1535 return (EINVAL); 1536 } 1537 m = m_get2(buflen, M_WAITOK, type, 0); 1538 m->m_len = buflen; 1539 error = copyin(buf, mtod(m, void *), buflen); 1540 if (error != 0) 1541 (void) m_free(m); 1542 else { 1543 *mp = m; 1544 if (type == MT_SONAME) { 1545 sa = mtod(m, struct sockaddr *); 1546 1547 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1548 if (sa->sa_family == 0 && sa->sa_len < AF_MAX && 1549 SV_CURPROC_FLAG(SV_AOUT)) 1550 sa->sa_family = sa->sa_len; 1551 #endif 1552 sa->sa_len = buflen; 1553 } 1554 } 1555 return (error); 1556 } 1557 1558 int 1559 getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr, size_t len) 1560 { 1561 struct sockaddr *sa; 1562 int error; 1563 1564 if (len > SOCK_MAXADDRLEN) 1565 return (ENAMETOOLONG); 1566 if (len < offsetof(struct sockaddr, sa_data[0])) 1567 return (EINVAL); 1568 sa = malloc(len, M_SONAME, M_WAITOK); 1569 error = copyin(uaddr, sa, len); 1570 if (error != 0) { 1571 free(sa, M_SONAME); 1572 } else { 1573 #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN 1574 if (sa->sa_family == 0 && sa->sa_len < AF_MAX && 1575 SV_CURPROC_FLAG(SV_AOUT)) 1576 sa->sa_family = sa->sa_len; 1577 #endif 1578 sa->sa_len = len; 1579 *namp = sa; 1580 } 1581 return (error); 1582 } 1583 1584 /* 1585 * Dispose of externalized rights from an SCM_RIGHTS message. This function 1586 * should be used in error or truncation cases to avoid leaking file descriptors 1587 * into the recipient's (the current thread's) table. 1588 */ 1589 void 1590 m_dispose_extcontrolm(struct mbuf *m) 1591 { 1592 struct cmsghdr *cm; 1593 struct file *fp; 1594 struct thread *td; 1595 socklen_t clen, datalen; 1596 int error, fd, *fds, nfd; 1597 1598 td = curthread; 1599 for (; m != NULL; m = m->m_next) { 1600 if (m->m_type != MT_EXTCONTROL) 1601 continue; 1602 cm = mtod(m, struct cmsghdr *); 1603 clen = m->m_len; 1604 while (clen > 0) { 1605 if (clen < sizeof(*cm)) 1606 panic("%s: truncated mbuf %p", __func__, m); 1607 datalen = CMSG_SPACE(cm->cmsg_len - CMSG_SPACE(0)); 1608 if (clen < datalen) 1609 panic("%s: truncated mbuf %p", __func__, m); 1610 1611 if (cm->cmsg_level == SOL_SOCKET && 1612 cm->cmsg_type == SCM_RIGHTS) { 1613 fds = (int *)CMSG_DATA(cm); 1614 nfd = (cm->cmsg_len - CMSG_SPACE(0)) / 1615 sizeof(int); 1616 1617 while (nfd-- > 0) { 1618 fd = *fds++; 1619 error = fget(td, fd, &cap_no_rights, 1620 &fp); 1621 if (error == 0) { 1622 fdclose(td, fp, fd); 1623 fdrop(fp, td); 1624 } 1625 } 1626 } 1627 clen -= datalen; 1628 cm = (struct cmsghdr *)((uint8_t *)cm + datalen); 1629 } 1630 m_chtype(m, MT_CONTROL); 1631 } 1632 } 1633