uipc_usrreq.c revision 124392
1/* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94 34 */ 35 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/kern/uipc_usrreq.c 124392 2004-01-11 19:48:19Z des $"); 38 39#include "opt_mac.h" 40 41#include <sys/param.h> 42#include <sys/domain.h> 43#include <sys/fcntl.h> 44#include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 45#include <sys/file.h> 46#include <sys/filedesc.h> 47#include <sys/jail.h> 48#include <sys/kernel.h> 49#include <sys/lock.h> 50#include <sys/mac.h> 51#include <sys/mbuf.h> 52#include <sys/mutex.h> 53#include <sys/namei.h> 54#include <sys/proc.h> 55#include <sys/protosw.h> 56#include <sys/resourcevar.h> 57#include <sys/socket.h> 58#include <sys/socketvar.h> 59#include <sys/signalvar.h> 60#include <sys/stat.h> 61#include <sys/sx.h> 62#include <sys/sysctl.h> 63#include <sys/systm.h> 64#include <sys/un.h> 65#include <sys/unpcb.h> 66#include <sys/vnode.h> 67 68#include <vm/uma.h> 69 70static uma_zone_t unp_zone; 71static unp_gen_t unp_gencnt; 72static u_int unp_count; 73 74static struct unp_head unp_shead, unp_dhead; 75 76/* 77 * Unix communications domain. 78 * 79 * TODO: 80 * SEQPACKET, RDM 81 * rethink name space problems 82 * need a proper out-of-band 83 * lock pushdown 84 */ 85static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 86static ino_t unp_ino; /* prototype for fake inode numbers */ 87 88static int unp_attach(struct socket *); 89static void unp_detach(struct unpcb *); 90static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *); 91static int unp_connect(struct socket *,struct sockaddr *, struct thread *); 92static void unp_disconnect(struct unpcb *); 93static void unp_shutdown(struct unpcb *); 94static void unp_drop(struct unpcb *, int); 95static void unp_gc(void); 96static void unp_scan(struct mbuf *, void (*)(struct file *)); 97static void unp_mark(struct file *); 98static void unp_discard(struct file *); 99static void unp_freerights(struct file **, int); 100static int unp_internalize(struct mbuf **, struct thread *); 101static int unp_listen(struct unpcb *, struct thread *); 102 103static int 104uipc_abort(struct socket *so) 105{ 106 struct unpcb *unp = sotounpcb(so); 107 108 if (unp == 0) 109 return (EINVAL); 110 unp_drop(unp, ECONNABORTED); 111 unp_detach(unp); 112 sotryfree(so); 113 return (0); 114} 115 116static int 117uipc_accept(struct socket *so, struct sockaddr **nam) 118{ 119 struct unpcb *unp = sotounpcb(so); 120 121 if (unp == 0) 122 return (EINVAL); 123 124 /* 125 * Pass back name of connected socket, 126 * if it was bound and we are still connected 127 * (our peer may have closed already!). 128 */ 129 if (unp->unp_conn && unp->unp_conn->unp_addr) { 130 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 131 1); 132 } else { 133 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 134 } 135 return (0); 136} 137 138static int 139uipc_attach(struct socket *so, int proto, struct thread *td) 140{ 141 struct unpcb *unp = sotounpcb(so); 142 143 if (unp != 0) 144 return (EISCONN); 145 return (unp_attach(so)); 146} 147 148static int 149uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 150{ 151 struct unpcb *unp = sotounpcb(so); 152 153 if (unp == 0) 154 return (EINVAL); 155 156 return (unp_bind(unp, nam, td)); 157} 158 159static int 160uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 161{ 162 struct unpcb *unp = sotounpcb(so); 163 164 if (unp == 0) 165 return (EINVAL); 166 return (unp_connect(so, nam, curthread)); 167} 168 169static int 170uipc_connect2(struct socket *so1, struct socket *so2) 171{ 172 struct unpcb *unp = sotounpcb(so1); 173 174 if (unp == 0) 175 return (EINVAL); 176 177 return (unp_connect2(so1, so2)); 178} 179 180/* control is EOPNOTSUPP */ 181 182static int 183uipc_detach(struct socket *so) 184{ 185 struct unpcb *unp = sotounpcb(so); 186 187 if (unp == 0) 188 return (EINVAL); 189 190 unp_detach(unp); 191 return (0); 192} 193 194static int 195uipc_disconnect(struct socket *so) 196{ 197 struct unpcb *unp = sotounpcb(so); 198 199 if (unp == 0) 200 return (EINVAL); 201 unp_disconnect(unp); 202 return (0); 203} 204 205static int 206uipc_listen(struct socket *so, struct thread *td) 207{ 208 struct unpcb *unp = sotounpcb(so); 209 210 if (unp == 0 || unp->unp_vnode == 0) 211 return (EINVAL); 212 return (unp_listen(unp, td)); 213} 214 215static int 216uipc_peeraddr(struct socket *so, struct sockaddr **nam) 217{ 218 struct unpcb *unp = sotounpcb(so); 219 220 if (unp == 0) 221 return (EINVAL); 222 if (unp->unp_conn && unp->unp_conn->unp_addr) 223 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 224 1); 225 else { 226 /* 227 * XXX: It seems that this test always fails even when 228 * connection is established. So, this else clause is 229 * added as workaround to return PF_LOCAL sockaddr. 230 */ 231 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 232 } 233 return (0); 234} 235 236static int 237uipc_rcvd(struct socket *so, int flags) 238{ 239 struct unpcb *unp = sotounpcb(so); 240 struct socket *so2; 241 u_long newhiwat; 242 243 if (unp == 0) 244 return (EINVAL); 245 switch (so->so_type) { 246 case SOCK_DGRAM: 247 panic("uipc_rcvd DGRAM?"); 248 /*NOTREACHED*/ 249 250 case SOCK_STREAM: 251 if (unp->unp_conn == 0) 252 break; 253 so2 = unp->unp_conn->unp_socket; 254 /* 255 * Adjust backpressure on sender 256 * and wakeup any waiting to write. 257 */ 258 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt; 259 unp->unp_mbcnt = so->so_rcv.sb_mbcnt; 260 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - 261 so->so_rcv.sb_cc; 262 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat, 263 newhiwat, RLIM_INFINITY); 264 unp->unp_cc = so->so_rcv.sb_cc; 265 sowwakeup(so2); 266 break; 267 268 default: 269 panic("uipc_rcvd unknown socktype"); 270 } 271 return (0); 272} 273 274/* pru_rcvoob is EOPNOTSUPP */ 275 276static int 277uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 278 struct mbuf *control, struct thread *td) 279{ 280 int error = 0; 281 struct unpcb *unp = sotounpcb(so); 282 struct socket *so2; 283 u_long newhiwat; 284 285 if (unp == 0) { 286 error = EINVAL; 287 goto release; 288 } 289 if (flags & PRUS_OOB) { 290 error = EOPNOTSUPP; 291 goto release; 292 } 293 294 if (control && (error = unp_internalize(&control, td))) 295 goto release; 296 297 switch (so->so_type) { 298 case SOCK_DGRAM: 299 { 300 struct sockaddr *from; 301 302 if (nam) { 303 if (unp->unp_conn) { 304 error = EISCONN; 305 break; 306 } 307 error = unp_connect(so, nam, td); 308 if (error) 309 break; 310 } else { 311 if (unp->unp_conn == 0) { 312 error = ENOTCONN; 313 break; 314 } 315 } 316 so2 = unp->unp_conn->unp_socket; 317 if (unp->unp_addr) 318 from = (struct sockaddr *)unp->unp_addr; 319 else 320 from = &sun_noname; 321 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 322 sorwakeup(so2); 323 m = 0; 324 control = 0; 325 } else { 326 error = ENOBUFS; 327 } 328 if (nam) 329 unp_disconnect(unp); 330 break; 331 } 332 333 case SOCK_STREAM: 334 /* Connect if not connected yet. */ 335 /* 336 * Note: A better implementation would complain 337 * if not equal to the peer's address. 338 */ 339 if ((so->so_state & SS_ISCONNECTED) == 0) { 340 if (nam) { 341 error = unp_connect(so, nam, td); 342 if (error) 343 break; /* XXX */ 344 } else { 345 error = ENOTCONN; 346 break; 347 } 348 } 349 350 if (so->so_state & SS_CANTSENDMORE) { 351 error = EPIPE; 352 break; 353 } 354 if (unp->unp_conn == 0) 355 panic("uipc_send connected but no connection?"); 356 so2 = unp->unp_conn->unp_socket; 357 /* 358 * Send to paired receive port, and then reduce 359 * send buffer hiwater marks to maintain backpressure. 360 * Wake up readers. 361 */ 362 if (control) { 363 if (sbappendcontrol(&so2->so_rcv, m, control)) 364 control = 0; 365 } else { 366 sbappend(&so2->so_rcv, m); 367 } 368 so->so_snd.sb_mbmax -= 369 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt; 370 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt; 371 newhiwat = so->so_snd.sb_hiwat - 372 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc); 373 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat, 374 newhiwat, RLIM_INFINITY); 375 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc; 376 sorwakeup(so2); 377 m = 0; 378 break; 379 380 default: 381 panic("uipc_send unknown socktype"); 382 } 383 384 /* 385 * SEND_EOF is equivalent to a SEND followed by 386 * a SHUTDOWN. 387 */ 388 if (flags & PRUS_EOF) { 389 socantsendmore(so); 390 unp_shutdown(unp); 391 } 392 393 if (control && error != 0) 394 unp_dispose(control); 395 396release: 397 if (control) 398 m_freem(control); 399 if (m) 400 m_freem(m); 401 return (error); 402} 403 404static int 405uipc_sense(struct socket *so, struct stat *sb) 406{ 407 struct unpcb *unp = sotounpcb(so); 408 struct socket *so2; 409 410 if (unp == 0) 411 return (EINVAL); 412 sb->st_blksize = so->so_snd.sb_hiwat; 413 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 414 so2 = unp->unp_conn->unp_socket; 415 sb->st_blksize += so2->so_rcv.sb_cc; 416 } 417 sb->st_dev = NOUDEV; 418 if (unp->unp_ino == 0) 419 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 420 sb->st_ino = unp->unp_ino; 421 return (0); 422} 423 424static int 425uipc_shutdown(struct socket *so) 426{ 427 struct unpcb *unp = sotounpcb(so); 428 429 if (unp == 0) 430 return (EINVAL); 431 socantsendmore(so); 432 unp_shutdown(unp); 433 return (0); 434} 435 436static int 437uipc_sockaddr(struct socket *so, struct sockaddr **nam) 438{ 439 struct unpcb *unp = sotounpcb(so); 440 441 if (unp == 0) 442 return (EINVAL); 443 if (unp->unp_addr) 444 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1); 445 else 446 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 447 return (0); 448} 449 450struct pr_usrreqs uipc_usrreqs = { 451 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect, 452 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect, 453 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp, 454 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr, 455 sosend, soreceive, sopoll, pru_sosetlabel_null 456}; 457 458int 459uipc_ctloutput(so, sopt) 460 struct socket *so; 461 struct sockopt *sopt; 462{ 463 struct unpcb *unp = sotounpcb(so); 464 int error; 465 466 switch (sopt->sopt_dir) { 467 case SOPT_GET: 468 switch (sopt->sopt_name) { 469 case LOCAL_PEERCRED: 470 if (unp->unp_flags & UNP_HAVEPC) 471 error = sooptcopyout(sopt, &unp->unp_peercred, 472 sizeof(unp->unp_peercred)); 473 else { 474 if (so->so_type == SOCK_STREAM) 475 error = ENOTCONN; 476 else 477 error = EINVAL; 478 } 479 break; 480 default: 481 error = EOPNOTSUPP; 482 break; 483 } 484 break; 485 case SOPT_SET: 486 default: 487 error = EOPNOTSUPP; 488 break; 489 } 490 return (error); 491} 492 493/* 494 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 495 * for stream sockets, although the total for sender and receiver is 496 * actually only PIPSIZ. 497 * Datagram sockets really use the sendspace as the maximum datagram size, 498 * and don't really want to reserve the sendspace. Their recvspace should 499 * be large enough for at least one max-size datagram plus address. 500 */ 501#ifndef PIPSIZ 502#define PIPSIZ 8192 503#endif 504static u_long unpst_sendspace = PIPSIZ; 505static u_long unpst_recvspace = PIPSIZ; 506static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 507static u_long unpdg_recvspace = 4*1024; 508 509static int unp_rights; /* file descriptors in flight */ 510 511SYSCTL_DECL(_net_local_stream); 512SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 513 &unpst_sendspace, 0, ""); 514SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 515 &unpst_recvspace, 0, ""); 516SYSCTL_DECL(_net_local_dgram); 517SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 518 &unpdg_sendspace, 0, ""); 519SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 520 &unpdg_recvspace, 0, ""); 521SYSCTL_DECL(_net_local); 522SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 523 524static int 525unp_attach(so) 526 struct socket *so; 527{ 528 register struct unpcb *unp; 529 int error; 530 531 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 532 switch (so->so_type) { 533 534 case SOCK_STREAM: 535 error = soreserve(so, unpst_sendspace, unpst_recvspace); 536 break; 537 538 case SOCK_DGRAM: 539 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 540 break; 541 542 default: 543 panic("unp_attach"); 544 } 545 if (error) 546 return (error); 547 } 548 unp = uma_zalloc(unp_zone, M_WAITOK); 549 if (unp == NULL) 550 return (ENOBUFS); 551 bzero(unp, sizeof *unp); 552 unp->unp_gencnt = ++unp_gencnt; 553 unp_count++; 554 LIST_INIT(&unp->unp_refs); 555 unp->unp_socket = so; 556 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 557 : &unp_shead, unp, unp_link); 558 so->so_pcb = unp; 559 return (0); 560} 561 562static void 563unp_detach(unp) 564 register struct unpcb *unp; 565{ 566 LIST_REMOVE(unp, unp_link); 567 unp->unp_gencnt = ++unp_gencnt; 568 --unp_count; 569 if (unp->unp_vnode) { 570 unp->unp_vnode->v_socket = 0; 571 vrele(unp->unp_vnode); 572 unp->unp_vnode = 0; 573 } 574 if (unp->unp_conn) 575 unp_disconnect(unp); 576 while (!LIST_EMPTY(&unp->unp_refs)) 577 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 578 soisdisconnected(unp->unp_socket); 579 unp->unp_socket->so_pcb = 0; 580 if (unp_rights) { 581 /* 582 * Normally the receive buffer is flushed later, 583 * in sofree, but if our receive buffer holds references 584 * to descriptors that are now garbage, we will dispose 585 * of those descriptor references after the garbage collector 586 * gets them (resulting in a "panic: closef: count < 0"). 587 */ 588 sorflush(unp->unp_socket); 589 unp_gc(); 590 } 591 if (unp->unp_addr) 592 FREE(unp->unp_addr, M_SONAME); 593 uma_zfree(unp_zone, unp); 594} 595 596static int 597unp_bind(unp, nam, td) 598 struct unpcb *unp; 599 struct sockaddr *nam; 600 struct thread *td; 601{ 602 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 603 struct vnode *vp; 604 struct mount *mp; 605 struct vattr vattr; 606 int error, namelen; 607 struct nameidata nd; 608 char *buf; 609 610 if (unp->unp_vnode != NULL) 611 return (EINVAL); 612 613 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 614 if (namelen <= 0) 615 return (EINVAL); 616 617 buf = malloc(namelen + 1, M_TEMP, M_WAITOK); 618 strlcpy(buf, soun->sun_path, namelen + 1); 619 620restart: 621 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE, 622 buf, td); 623/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 624 error = namei(&nd); 625 if (error) { 626 free(buf, M_TEMP); 627 return (error); 628 } 629 vp = nd.ni_vp; 630 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 631 NDFREE(&nd, NDF_ONLY_PNBUF); 632 if (nd.ni_dvp == vp) 633 vrele(nd.ni_dvp); 634 else 635 vput(nd.ni_dvp); 636 if (vp != NULL) { 637 vrele(vp); 638 free(buf, M_TEMP); 639 return (EADDRINUSE); 640 } 641 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 642 if (error) { 643 free(buf, M_TEMP); 644 return (error); 645 } 646 goto restart; 647 } 648 VATTR_NULL(&vattr); 649 vattr.va_type = VSOCK; 650 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 651#ifdef MAC 652 error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 653 &vattr); 654#endif 655 if (error == 0) { 656 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 657 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 658 } 659 NDFREE(&nd, NDF_ONLY_PNBUF); 660 vput(nd.ni_dvp); 661 if (error) { 662 free(buf, M_TEMP); 663 return (error); 664 } 665 vp = nd.ni_vp; 666 vp->v_socket = unp->unp_socket; 667 unp->unp_vnode = vp; 668 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1); 669 VOP_UNLOCK(vp, 0, td); 670 vn_finished_write(mp); 671 free(buf, M_TEMP); 672 return (0); 673} 674 675static int 676unp_connect(so, nam, td) 677 struct socket *so; 678 struct sockaddr *nam; 679 struct thread *td; 680{ 681 register struct sockaddr_un *soun = (struct sockaddr_un *)nam; 682 register struct vnode *vp; 683 register struct socket *so2, *so3; 684 struct unpcb *unp, *unp2, *unp3; 685 int error, len; 686 struct nameidata nd; 687 char buf[SOCK_MAXADDRLEN]; 688 689 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 690 if (len <= 0) 691 return (EINVAL); 692 strlcpy(buf, soun->sun_path, len + 1); 693 694 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td); 695 error = namei(&nd); 696 if (error) 697 return (error); 698 vp = nd.ni_vp; 699 NDFREE(&nd, NDF_ONLY_PNBUF); 700 if (vp->v_type != VSOCK) { 701 error = ENOTSOCK; 702 goto bad; 703 } 704 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 705 if (error) 706 goto bad; 707 so2 = vp->v_socket; 708 if (so2 == 0) { 709 error = ECONNREFUSED; 710 goto bad; 711 } 712 if (so->so_type != so2->so_type) { 713 error = EPROTOTYPE; 714 goto bad; 715 } 716 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 717 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 718 (so3 = sonewconn(so2, 0)) == 0) { 719 error = ECONNREFUSED; 720 goto bad; 721 } 722 unp = sotounpcb(so); 723 unp2 = sotounpcb(so2); 724 unp3 = sotounpcb(so3); 725 if (unp2->unp_addr) 726 unp3->unp_addr = (struct sockaddr_un *) 727 dup_sockaddr((struct sockaddr *) 728 unp2->unp_addr, 1); 729 730 /* 731 * unp_peercred management: 732 * 733 * The connecter's (client's) credentials are copied 734 * from its process structure at the time of connect() 735 * (which is now). 736 */ 737 cru2x(td->td_ucred, &unp3->unp_peercred); 738 unp3->unp_flags |= UNP_HAVEPC; 739 /* 740 * The receiver's (server's) credentials are copied 741 * from the unp_peercred member of socket on which the 742 * former called listen(); unp_listen() cached that 743 * process's credentials at that time so we can use 744 * them now. 745 */ 746 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 747 ("unp_connect: listener without cached peercred")); 748 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 749 sizeof(unp->unp_peercred)); 750 unp->unp_flags |= UNP_HAVEPC; 751#ifdef MAC 752 mac_set_socket_peer_from_socket(so, so3); 753 mac_set_socket_peer_from_socket(so3, so); 754#endif 755 756 so2 = so3; 757 } 758 error = unp_connect2(so, so2); 759bad: 760 vput(vp); 761 return (error); 762} 763 764int 765unp_connect2(so, so2) 766 register struct socket *so; 767 register struct socket *so2; 768{ 769 register struct unpcb *unp = sotounpcb(so); 770 register struct unpcb *unp2; 771 772 if (so2->so_type != so->so_type) 773 return (EPROTOTYPE); 774 unp2 = sotounpcb(so2); 775 unp->unp_conn = unp2; 776 switch (so->so_type) { 777 778 case SOCK_DGRAM: 779 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 780 soisconnected(so); 781 break; 782 783 case SOCK_STREAM: 784 unp2->unp_conn = unp; 785 soisconnected(so); 786 soisconnected(so2); 787 break; 788 789 default: 790 panic("unp_connect2"); 791 } 792 return (0); 793} 794 795static void 796unp_disconnect(unp) 797 struct unpcb *unp; 798{ 799 register struct unpcb *unp2 = unp->unp_conn; 800 801 if (unp2 == 0) 802 return; 803 unp->unp_conn = 0; 804 switch (unp->unp_socket->so_type) { 805 806 case SOCK_DGRAM: 807 LIST_REMOVE(unp, unp_reflink); 808 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 809 break; 810 811 case SOCK_STREAM: 812 soisdisconnected(unp->unp_socket); 813 unp2->unp_conn = 0; 814 soisdisconnected(unp2->unp_socket); 815 break; 816 } 817} 818 819#ifdef notdef 820void 821unp_abort(unp) 822 struct unpcb *unp; 823{ 824 825 unp_detach(unp); 826} 827#endif 828 829static int 830unp_pcblist(SYSCTL_HANDLER_ARGS) 831{ 832 int error, i, n; 833 struct unpcb *unp, **unp_list; 834 unp_gen_t gencnt; 835 struct xunpgen *xug; 836 struct unp_head *head; 837 struct xunpcb *xu; 838 839 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 840 841 /* 842 * The process of preparing the PCB list is too time-consuming and 843 * resource-intensive to repeat twice on every request. 844 */ 845 if (req->oldptr == 0) { 846 n = unp_count; 847 req->oldidx = 2 * (sizeof *xug) 848 + (n + n/8) * sizeof(struct xunpcb); 849 return (0); 850 } 851 852 if (req->newptr != 0) 853 return (EPERM); 854 855 /* 856 * OK, now we're committed to doing something. 857 */ 858 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 859 gencnt = unp_gencnt; 860 n = unp_count; 861 862 xug->xug_len = sizeof *xug; 863 xug->xug_count = n; 864 xug->xug_gen = gencnt; 865 xug->xug_sogen = so_gencnt; 866 error = SYSCTL_OUT(req, xug, sizeof *xug); 867 if (error) { 868 free(xug, M_TEMP); 869 return (error); 870 } 871 872 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 873 874 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 875 unp = LIST_NEXT(unp, unp_link)) { 876 if (unp->unp_gencnt <= gencnt) { 877 if (cr_cansee(req->td->td_ucred, 878 unp->unp_socket->so_cred)) 879 continue; 880 unp_list[i++] = unp; 881 } 882 } 883 n = i; /* in case we lost some during malloc */ 884 885 error = 0; 886 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK); 887 for (i = 0; i < n; i++) { 888 unp = unp_list[i]; 889 if (unp->unp_gencnt <= gencnt) { 890 xu->xu_len = sizeof *xu; 891 xu->xu_unpp = unp; 892 /* 893 * XXX - need more locking here to protect against 894 * connect/disconnect races for SMP. 895 */ 896 if (unp->unp_addr) 897 bcopy(unp->unp_addr, &xu->xu_addr, 898 unp->unp_addr->sun_len); 899 if (unp->unp_conn && unp->unp_conn->unp_addr) 900 bcopy(unp->unp_conn->unp_addr, 901 &xu->xu_caddr, 902 unp->unp_conn->unp_addr->sun_len); 903 bcopy(unp, &xu->xu_unp, sizeof *unp); 904 sotoxsocket(unp->unp_socket, &xu->xu_socket); 905 error = SYSCTL_OUT(req, xu, sizeof *xu); 906 } 907 } 908 free(xu, M_TEMP); 909 if (!error) { 910 /* 911 * Give the user an updated idea of our state. 912 * If the generation differs from what we told 913 * her before, she knows that something happened 914 * while we were processing this request, and it 915 * might be necessary to retry. 916 */ 917 xug->xug_gen = unp_gencnt; 918 xug->xug_sogen = so_gencnt; 919 xug->xug_count = unp_count; 920 error = SYSCTL_OUT(req, xug, sizeof *xug); 921 } 922 free(unp_list, M_TEMP); 923 free(xug, M_TEMP); 924 return (error); 925} 926 927SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 928 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 929 "List of active local datagram sockets"); 930SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 931 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 932 "List of active local stream sockets"); 933 934static void 935unp_shutdown(unp) 936 struct unpcb *unp; 937{ 938 struct socket *so; 939 940 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 941 (so = unp->unp_conn->unp_socket)) 942 socantrcvmore(so); 943} 944 945static void 946unp_drop(unp, errno) 947 struct unpcb *unp; 948 int errno; 949{ 950 struct socket *so = unp->unp_socket; 951 952 so->so_error = errno; 953 unp_disconnect(unp); 954} 955 956#ifdef notdef 957void 958unp_drain() 959{ 960 961} 962#endif 963 964static void 965unp_freerights(rp, fdcount) 966 struct file **rp; 967 int fdcount; 968{ 969 int i; 970 struct file *fp; 971 972 for (i = 0; i < fdcount; i++) { 973 fp = *rp; 974 /* 975 * zero the pointer before calling 976 * unp_discard since it may end up 977 * in unp_gc().. 978 */ 979 *rp++ = 0; 980 unp_discard(fp); 981 } 982} 983 984int 985unp_externalize(control, controlp) 986 struct mbuf *control, **controlp; 987{ 988 struct thread *td = curthread; /* XXX */ 989 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 990 int i; 991 int *fdp; 992 struct file **rp; 993 struct file *fp; 994 void *data; 995 socklen_t clen = control->m_len, datalen; 996 int error, newfds; 997 int f; 998 u_int newlen; 999 1000 error = 0; 1001 if (controlp != NULL) /* controlp == NULL => free control messages */ 1002 *controlp = NULL; 1003 1004 while (cm != NULL) { 1005 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 1006 error = EINVAL; 1007 break; 1008 } 1009 1010 data = CMSG_DATA(cm); 1011 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1012 1013 if (cm->cmsg_level == SOL_SOCKET 1014 && cm->cmsg_type == SCM_RIGHTS) { 1015 newfds = datalen / sizeof(struct file *); 1016 rp = data; 1017 1018 /* If we're not outputting the descriptors free them. */ 1019 if (error || controlp == NULL) { 1020 unp_freerights(rp, newfds); 1021 goto next; 1022 } 1023 FILEDESC_LOCK(td->td_proc->p_fd); 1024 /* if the new FD's will not fit free them. */ 1025 if (!fdavail(td, newfds)) { 1026 FILEDESC_UNLOCK(td->td_proc->p_fd); 1027 error = EMSGSIZE; 1028 unp_freerights(rp, newfds); 1029 goto next; 1030 } 1031 /* 1032 * now change each pointer to an fd in the global 1033 * table to an integer that is the index to the 1034 * local fd table entry that we set up to point 1035 * to the global one we are transferring. 1036 */ 1037 newlen = newfds * sizeof(int); 1038 *controlp = sbcreatecontrol(NULL, newlen, 1039 SCM_RIGHTS, SOL_SOCKET); 1040 if (*controlp == NULL) { 1041 FILEDESC_UNLOCK(td->td_proc->p_fd); 1042 error = E2BIG; 1043 unp_freerights(rp, newfds); 1044 goto next; 1045 } 1046 1047 fdp = (int *) 1048 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1049 for (i = 0; i < newfds; i++) { 1050 if (fdalloc(td, 0, &f)) 1051 panic("unp_externalize fdalloc failed"); 1052 fp = *rp++; 1053 td->td_proc->p_fd->fd_ofiles[f] = fp; 1054 FILE_LOCK(fp); 1055 fp->f_msgcount--; 1056 FILE_UNLOCK(fp); 1057 unp_rights--; 1058 *fdp++ = f; 1059 } 1060 FILEDESC_UNLOCK(td->td_proc->p_fd); 1061 } else { /* We can just copy anything else across */ 1062 if (error || controlp == NULL) 1063 goto next; 1064 *controlp = sbcreatecontrol(NULL, datalen, 1065 cm->cmsg_type, cm->cmsg_level); 1066 if (*controlp == NULL) { 1067 error = ENOBUFS; 1068 goto next; 1069 } 1070 bcopy(data, 1071 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1072 datalen); 1073 } 1074 1075 controlp = &(*controlp)->m_next; 1076 1077next: 1078 if (CMSG_SPACE(datalen) < clen) { 1079 clen -= CMSG_SPACE(datalen); 1080 cm = (struct cmsghdr *) 1081 ((caddr_t)cm + CMSG_SPACE(datalen)); 1082 } else { 1083 clen = 0; 1084 cm = NULL; 1085 } 1086 } 1087 1088 m_freem(control); 1089 1090 return (error); 1091} 1092 1093void 1094unp_init(void) 1095{ 1096 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1097 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1098 uma_zone_set_max(unp_zone, nmbclusters); 1099 if (unp_zone == 0) 1100 panic("unp_init"); 1101 LIST_INIT(&unp_dhead); 1102 LIST_INIT(&unp_shead); 1103} 1104 1105static int 1106unp_internalize(controlp, td) 1107 struct mbuf **controlp; 1108 struct thread *td; 1109{ 1110 struct mbuf *control = *controlp; 1111 struct proc *p = td->td_proc; 1112 struct filedesc *fdescp = p->p_fd; 1113 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1114 struct cmsgcred *cmcred; 1115 struct file **rp; 1116 struct file *fp; 1117 struct timeval *tv; 1118 int i, fd, *fdp; 1119 void *data; 1120 socklen_t clen = control->m_len, datalen; 1121 int error, oldfds; 1122 u_int newlen; 1123 1124 error = 0; 1125 *controlp = NULL; 1126 1127 while (cm != NULL) { 1128 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1129 || cm->cmsg_len > clen) { 1130 error = EINVAL; 1131 goto out; 1132 } 1133 1134 data = CMSG_DATA(cm); 1135 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1136 1137 switch (cm->cmsg_type) { 1138 /* 1139 * Fill in credential information. 1140 */ 1141 case SCM_CREDS: 1142 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1143 SCM_CREDS, SOL_SOCKET); 1144 if (*controlp == NULL) { 1145 error = ENOBUFS; 1146 goto out; 1147 } 1148 1149 cmcred = (struct cmsgcred *) 1150 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1151 cmcred->cmcred_pid = p->p_pid; 1152 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1153 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1154 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1155 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1156 CMGROUP_MAX); 1157 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1158 cmcred->cmcred_groups[i] = 1159 td->td_ucred->cr_groups[i]; 1160 break; 1161 1162 case SCM_RIGHTS: 1163 oldfds = datalen / sizeof (int); 1164 /* 1165 * check that all the FDs passed in refer to legal files 1166 * If not, reject the entire operation. 1167 */ 1168 fdp = data; 1169 FILEDESC_LOCK(fdescp); 1170 for (i = 0; i < oldfds; i++) { 1171 fd = *fdp++; 1172 if ((unsigned)fd >= fdescp->fd_nfiles || 1173 fdescp->fd_ofiles[fd] == NULL) { 1174 FILEDESC_UNLOCK(fdescp); 1175 error = EBADF; 1176 goto out; 1177 } 1178 fp = fdescp->fd_ofiles[fd]; 1179 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) { 1180 FILEDESC_UNLOCK(fdescp); 1181 error = EOPNOTSUPP; 1182 goto out; 1183 } 1184 1185 } 1186 /* 1187 * Now replace the integer FDs with pointers to 1188 * the associated global file table entry.. 1189 */ 1190 newlen = oldfds * sizeof(struct file *); 1191 *controlp = sbcreatecontrol(NULL, newlen, 1192 SCM_RIGHTS, SOL_SOCKET); 1193 if (*controlp == NULL) { 1194 FILEDESC_UNLOCK(fdescp); 1195 error = E2BIG; 1196 goto out; 1197 } 1198 1199 fdp = data; 1200 rp = (struct file **) 1201 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1202 for (i = 0; i < oldfds; i++) { 1203 fp = fdescp->fd_ofiles[*fdp++]; 1204 *rp++ = fp; 1205 FILE_LOCK(fp); 1206 fp->f_count++; 1207 fp->f_msgcount++; 1208 FILE_UNLOCK(fp); 1209 unp_rights++; 1210 } 1211 FILEDESC_UNLOCK(fdescp); 1212 break; 1213 1214 case SCM_TIMESTAMP: 1215 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 1216 SCM_TIMESTAMP, SOL_SOCKET); 1217 if (*controlp == NULL) { 1218 error = ENOBUFS; 1219 goto out; 1220 } 1221 tv = (struct timeval *) 1222 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1223 microtime(tv); 1224 break; 1225 1226 default: 1227 error = EINVAL; 1228 goto out; 1229 } 1230 1231 controlp = &(*controlp)->m_next; 1232 1233 if (CMSG_SPACE(datalen) < clen) { 1234 clen -= CMSG_SPACE(datalen); 1235 cm = (struct cmsghdr *) 1236 ((caddr_t)cm + CMSG_SPACE(datalen)); 1237 } else { 1238 clen = 0; 1239 cm = NULL; 1240 } 1241 } 1242 1243out: 1244 m_freem(control); 1245 1246 return (error); 1247} 1248 1249static int unp_defer, unp_gcing; 1250 1251static void 1252unp_gc() 1253{ 1254 register struct file *fp, *nextfp; 1255 register struct socket *so; 1256 struct file **extra_ref, **fpp; 1257 int nunref, i; 1258 1259 if (unp_gcing) 1260 return; 1261 unp_gcing = 1; 1262 unp_defer = 0; 1263 /* 1264 * before going through all this, set all FDs to 1265 * be NOT defered and NOT externally accessible 1266 */ 1267 sx_slock(&filelist_lock); 1268 LIST_FOREACH(fp, &filehead, f_list) 1269 fp->f_gcflag &= ~(FMARK|FDEFER); 1270 do { 1271 LIST_FOREACH(fp, &filehead, f_list) { 1272 FILE_LOCK(fp); 1273 /* 1274 * If the file is not open, skip it 1275 */ 1276 if (fp->f_count == 0) { 1277 FILE_UNLOCK(fp); 1278 continue; 1279 } 1280 /* 1281 * If we already marked it as 'defer' in a 1282 * previous pass, then try process it this time 1283 * and un-mark it 1284 */ 1285 if (fp->f_gcflag & FDEFER) { 1286 fp->f_gcflag &= ~FDEFER; 1287 unp_defer--; 1288 } else { 1289 /* 1290 * if it's not defered, then check if it's 1291 * already marked.. if so skip it 1292 */ 1293 if (fp->f_gcflag & FMARK) { 1294 FILE_UNLOCK(fp); 1295 continue; 1296 } 1297 /* 1298 * If all references are from messages 1299 * in transit, then skip it. it's not 1300 * externally accessible. 1301 */ 1302 if (fp->f_count == fp->f_msgcount) { 1303 FILE_UNLOCK(fp); 1304 continue; 1305 } 1306 /* 1307 * If it got this far then it must be 1308 * externally accessible. 1309 */ 1310 fp->f_gcflag |= FMARK; 1311 } 1312 /* 1313 * either it was defered, or it is externally 1314 * accessible and not already marked so. 1315 * Now check if it is possibly one of OUR sockets. 1316 */ 1317 if (fp->f_type != DTYPE_SOCKET || 1318 (so = fp->f_data) == NULL) { 1319 FILE_UNLOCK(fp); 1320 continue; 1321 } 1322 FILE_UNLOCK(fp); 1323 if (so->so_proto->pr_domain != &localdomain || 1324 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 1325 continue; 1326#ifdef notdef 1327 if (so->so_rcv.sb_flags & SB_LOCK) { 1328 /* 1329 * This is problematical; it's not clear 1330 * we need to wait for the sockbuf to be 1331 * unlocked (on a uniprocessor, at least), 1332 * and it's also not clear what to do 1333 * if sbwait returns an error due to receipt 1334 * of a signal. If sbwait does return 1335 * an error, we'll go into an infinite 1336 * loop. Delete all of this for now. 1337 */ 1338 (void) sbwait(&so->so_rcv); 1339 goto restart; 1340 } 1341#endif 1342 /* 1343 * So, Ok, it's one of our sockets and it IS externally 1344 * accessible (or was defered). Now we look 1345 * to see if we hold any file descriptors in its 1346 * message buffers. Follow those links and mark them 1347 * as accessible too. 1348 */ 1349 unp_scan(so->so_rcv.sb_mb, unp_mark); 1350 } 1351 } while (unp_defer); 1352 sx_sunlock(&filelist_lock); 1353 /* 1354 * We grab an extra reference to each of the file table entries 1355 * that are not otherwise accessible and then free the rights 1356 * that are stored in messages on them. 1357 * 1358 * The bug in the orginal code is a little tricky, so I'll describe 1359 * what's wrong with it here. 1360 * 1361 * It is incorrect to simply unp_discard each entry for f_msgcount 1362 * times -- consider the case of sockets A and B that contain 1363 * references to each other. On a last close of some other socket, 1364 * we trigger a gc since the number of outstanding rights (unp_rights) 1365 * is non-zero. If during the sweep phase the gc code un_discards, 1366 * we end up doing a (full) closef on the descriptor. A closef on A 1367 * results in the following chain. Closef calls soo_close, which 1368 * calls soclose. Soclose calls first (through the switch 1369 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1370 * returns because the previous instance had set unp_gcing, and 1371 * we return all the way back to soclose, which marks the socket 1372 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1373 * to free up the rights that are queued in messages on the socket A, 1374 * i.e., the reference on B. The sorflush calls via the dom_dispose 1375 * switch unp_dispose, which unp_scans with unp_discard. This second 1376 * instance of unp_discard just calls closef on B. 1377 * 1378 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1379 * which results in another closef on A. Unfortunately, A is already 1380 * being closed, and the descriptor has already been marked with 1381 * SS_NOFDREF, and soclose panics at this point. 1382 * 1383 * Here, we first take an extra reference to each inaccessible 1384 * descriptor. Then, we call sorflush ourself, since we know 1385 * it is a Unix domain socket anyhow. After we destroy all the 1386 * rights carried in messages, we do a last closef to get rid 1387 * of our extra reference. This is the last close, and the 1388 * unp_detach etc will shut down the socket. 1389 * 1390 * 91/09/19, bsy@cs.cmu.edu 1391 */ 1392 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK); 1393 sx_slock(&filelist_lock); 1394 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0; 1395 fp = nextfp) { 1396 nextfp = LIST_NEXT(fp, f_list); 1397 FILE_LOCK(fp); 1398 /* 1399 * If it's not open, skip it 1400 */ 1401 if (fp->f_count == 0) { 1402 FILE_UNLOCK(fp); 1403 continue; 1404 } 1405 /* 1406 * If all refs are from msgs, and it's not marked accessible 1407 * then it must be referenced from some unreachable cycle 1408 * of (shut-down) FDs, so include it in our 1409 * list of FDs to remove 1410 */ 1411 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) { 1412 *fpp++ = fp; 1413 nunref++; 1414 fp->f_count++; 1415 } 1416 FILE_UNLOCK(fp); 1417 } 1418 sx_sunlock(&filelist_lock); 1419 /* 1420 * for each FD on our hit list, do the following two things 1421 */ 1422 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { 1423 struct file *tfp = *fpp; 1424 FILE_LOCK(tfp); 1425 if (tfp->f_type == DTYPE_SOCKET && 1426 tfp->f_data != NULL) { 1427 FILE_UNLOCK(tfp); 1428 sorflush(tfp->f_data); 1429 } else { 1430 FILE_UNLOCK(tfp); 1431 } 1432 } 1433 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) 1434 closef(*fpp, (struct thread *) NULL); 1435 free(extra_ref, M_TEMP); 1436 unp_gcing = 0; 1437} 1438 1439void 1440unp_dispose(m) 1441 struct mbuf *m; 1442{ 1443 1444 if (m) 1445 unp_scan(m, unp_discard); 1446} 1447 1448static int 1449unp_listen(unp, td) 1450 struct unpcb *unp; 1451 struct thread *td; 1452{ 1453 1454 cru2x(td->td_ucred, &unp->unp_peercred); 1455 unp->unp_flags |= UNP_HAVEPCCACHED; 1456 return (0); 1457} 1458 1459static void 1460unp_scan(m0, op) 1461 register struct mbuf *m0; 1462 void (*op)(struct file *); 1463{ 1464 struct mbuf *m; 1465 struct file **rp; 1466 struct cmsghdr *cm; 1467 void *data; 1468 int i; 1469 socklen_t clen, datalen; 1470 int qfds; 1471 1472 while (m0) { 1473 for (m = m0; m; m = m->m_next) { 1474 if (m->m_type != MT_CONTROL) 1475 continue; 1476 1477 cm = mtod(m, struct cmsghdr *); 1478 clen = m->m_len; 1479 1480 while (cm != NULL) { 1481 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 1482 break; 1483 1484 data = CMSG_DATA(cm); 1485 datalen = (caddr_t)cm + cm->cmsg_len 1486 - (caddr_t)data; 1487 1488 if (cm->cmsg_level == SOL_SOCKET && 1489 cm->cmsg_type == SCM_RIGHTS) { 1490 qfds = datalen / sizeof (struct file *); 1491 rp = data; 1492 for (i = 0; i < qfds; i++) 1493 (*op)(*rp++); 1494 } 1495 1496 if (CMSG_SPACE(datalen) < clen) { 1497 clen -= CMSG_SPACE(datalen); 1498 cm = (struct cmsghdr *) 1499 ((caddr_t)cm + CMSG_SPACE(datalen)); 1500 } else { 1501 clen = 0; 1502 cm = NULL; 1503 } 1504 } 1505 } 1506 m0 = m0->m_act; 1507 } 1508} 1509 1510static void 1511unp_mark(fp) 1512 struct file *fp; 1513{ 1514 if (fp->f_gcflag & FMARK) 1515 return; 1516 unp_defer++; 1517 fp->f_gcflag |= (FMARK|FDEFER); 1518} 1519 1520static void 1521unp_discard(fp) 1522 struct file *fp; 1523{ 1524 FILE_LOCK(fp); 1525 fp->f_msgcount--; 1526 unp_rights--; 1527 FILE_UNLOCK(fp); 1528 (void) closef(fp, (struct thread *)NULL); 1529} 1530