uipc_usrreq.c revision 112516
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 * $FreeBSD: head/sys/kern/uipc_usrreq.c 112516 2003-03-23 19:41:34Z cognet $ 35 */ 36 37#include "opt_mac.h" 38 39#include <sys/param.h> 40#include <sys/domain.h> 41#include <sys/fcntl.h> 42#include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 43#include <sys/file.h> 44#include <sys/filedesc.h> 45#include <sys/jail.h> 46#include <sys/kernel.h> 47#include <sys/lock.h> 48#include <sys/mac.h> 49#include <sys/mbuf.h> 50#include <sys/mutex.h> 51#include <sys/namei.h> 52#include <sys/proc.h> 53#include <sys/protosw.h> 54#include <sys/resourcevar.h> 55#include <sys/socket.h> 56#include <sys/socketvar.h> 57#include <sys/signalvar.h> 58#include <sys/stat.h> 59#include <sys/sx.h> 60#include <sys/sysctl.h> 61#include <sys/systm.h> 62#include <sys/un.h> 63#include <sys/unpcb.h> 64#include <sys/vnode.h> 65 66#include <vm/uma.h> 67 68static uma_zone_t unp_zone; 69static unp_gen_t unp_gencnt; 70static u_int unp_count; 71 72static struct unp_head unp_shead, unp_dhead; 73 74/* 75 * Unix communications domain. 76 * 77 * TODO: 78 * SEQPACKET, RDM 79 * rethink name space problems 80 * need a proper out-of-band 81 * lock pushdown 82 */ 83static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 84static ino_t unp_ino; /* prototype for fake inode numbers */ 85 86static int unp_attach(struct socket *); 87static void unp_detach(struct unpcb *); 88static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *); 89static int unp_connect(struct socket *,struct sockaddr *, struct thread *); 90static void unp_disconnect(struct unpcb *); 91static void unp_shutdown(struct unpcb *); 92static void unp_drop(struct unpcb *, int); 93static void unp_gc(void); 94static void unp_scan(struct mbuf *, void (*)(struct file *)); 95static void unp_mark(struct file *); 96static void unp_discard(struct file *); 97static void unp_freerights(struct file **, int); 98static int unp_internalize(struct mbuf **, struct thread *); 99static int unp_listen(struct unpcb *, struct thread *); 100 101static int 102uipc_abort(struct socket *so) 103{ 104 struct unpcb *unp = sotounpcb(so); 105 106 if (unp == 0) 107 return EINVAL; 108 unp_drop(unp, ECONNABORTED); 109 unp_detach(unp); 110 sotryfree(so); 111 return 0; 112} 113 114static int 115uipc_accept(struct socket *so, struct sockaddr **nam) 116{ 117 struct unpcb *unp = sotounpcb(so); 118 119 if (unp == 0) 120 return EINVAL; 121 122 /* 123 * Pass back name of connected socket, 124 * if it was bound and we are still connected 125 * (our peer may have closed already!). 126 */ 127 if (unp->unp_conn && unp->unp_conn->unp_addr) { 128 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 129 1); 130 } else { 131 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 132 } 133 return 0; 134} 135 136static int 137uipc_attach(struct socket *so, int proto, struct thread *td) 138{ 139 struct unpcb *unp = sotounpcb(so); 140 141 if (unp != 0) 142 return EISCONN; 143 return unp_attach(so); 144} 145 146static int 147uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 148{ 149 struct unpcb *unp = sotounpcb(so); 150 151 if (unp == 0) 152 return EINVAL; 153 154 return unp_bind(unp, nam, td); 155} 156 157static int 158uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 159{ 160 struct unpcb *unp = sotounpcb(so); 161 162 if (unp == 0) 163 return EINVAL; 164 return unp_connect(so, nam, curthread); 165} 166 167static int 168uipc_connect2(struct socket *so1, struct socket *so2) 169{ 170 struct unpcb *unp = sotounpcb(so1); 171 172 if (unp == 0) 173 return EINVAL; 174 175 return unp_connect2(so1, so2); 176} 177 178/* control is EOPNOTSUPP */ 179 180static int 181uipc_detach(struct socket *so) 182{ 183 struct unpcb *unp = sotounpcb(so); 184 185 if (unp == 0) 186 return EINVAL; 187 188 unp_detach(unp); 189 return 0; 190} 191 192static int 193uipc_disconnect(struct socket *so) 194{ 195 struct unpcb *unp = sotounpcb(so); 196 197 if (unp == 0) 198 return EINVAL; 199 unp_disconnect(unp); 200 return 0; 201} 202 203static int 204uipc_listen(struct socket *so, struct thread *td) 205{ 206 struct unpcb *unp = sotounpcb(so); 207 208 if (unp == 0 || unp->unp_vnode == 0) 209 return EINVAL; 210 return unp_listen(unp, td); 211} 212 213static int 214uipc_peeraddr(struct socket *so, struct sockaddr **nam) 215{ 216 struct unpcb *unp = sotounpcb(so); 217 218 if (unp == 0) 219 return EINVAL; 220 if (unp->unp_conn && unp->unp_conn->unp_addr) 221 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 222 1); 223 else { 224 /* 225 * XXX: It seems that this test always fails even when 226 * connection is established. So, this else clause is 227 * added as workaround to return PF_LOCAL sockaddr. 228 */ 229 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 230 } 231 return 0; 232} 233 234static int 235uipc_rcvd(struct socket *so, int flags) 236{ 237 struct unpcb *unp = sotounpcb(so); 238 struct socket *so2; 239 u_long newhiwat; 240 241 if (unp == 0) 242 return EINVAL; 243 switch (so->so_type) { 244 case SOCK_DGRAM: 245 panic("uipc_rcvd DGRAM?"); 246 /*NOTREACHED*/ 247 248 case SOCK_STREAM: 249 if (unp->unp_conn == 0) 250 break; 251 so2 = unp->unp_conn->unp_socket; 252 /* 253 * Adjust backpressure on sender 254 * and wakeup any waiting to write. 255 */ 256 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt; 257 unp->unp_mbcnt = so->so_rcv.sb_mbcnt; 258 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - 259 so->so_rcv.sb_cc; 260 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat, 261 newhiwat, RLIM_INFINITY); 262 unp->unp_cc = so->so_rcv.sb_cc; 263 sowwakeup(so2); 264 break; 265 266 default: 267 panic("uipc_rcvd unknown socktype"); 268 } 269 return 0; 270} 271 272/* pru_rcvoob is EOPNOTSUPP */ 273 274static int 275uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 276 struct mbuf *control, struct thread *td) 277{ 278 int error = 0; 279 struct unpcb *unp = sotounpcb(so); 280 struct socket *so2; 281 u_long newhiwat; 282 283 if (unp == 0) { 284 error = EINVAL; 285 goto release; 286 } 287 if (flags & PRUS_OOB) { 288 error = EOPNOTSUPP; 289 goto release; 290 } 291 292 if (control && (error = unp_internalize(&control, td))) 293 goto release; 294 295 switch (so->so_type) { 296 case SOCK_DGRAM: 297 { 298 struct sockaddr *from; 299 300 if (nam) { 301 if (unp->unp_conn) { 302 error = EISCONN; 303 break; 304 } 305 error = unp_connect(so, nam, td); 306 if (error) 307 break; 308 } else { 309 if (unp->unp_conn == 0) { 310 error = ENOTCONN; 311 break; 312 } 313 } 314 so2 = unp->unp_conn->unp_socket; 315 if (unp->unp_addr) 316 from = (struct sockaddr *)unp->unp_addr; 317 else 318 from = &sun_noname; 319 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 320 sorwakeup(so2); 321 m = 0; 322 control = 0; 323 } else 324 error = ENOBUFS; 325 if (nam) 326 unp_disconnect(unp); 327 break; 328 } 329 330 case SOCK_STREAM: 331 /* Connect if not connected yet. */ 332 /* 333 * Note: A better implementation would complain 334 * if not equal to the peer's address. 335 */ 336 if ((so->so_state & SS_ISCONNECTED) == 0) { 337 if (nam) { 338 error = unp_connect(so, nam, td); 339 if (error) 340 break; /* XXX */ 341 } else { 342 error = ENOTCONN; 343 break; 344 } 345 } 346 347 if (so->so_state & SS_CANTSENDMORE) { 348 error = EPIPE; 349 break; 350 } 351 if (unp->unp_conn == 0) 352 panic("uipc_send connected but no connection?"); 353 so2 = unp->unp_conn->unp_socket; 354 /* 355 * Send to paired receive port, and then reduce 356 * send buffer hiwater marks to maintain backpressure. 357 * Wake up readers. 358 */ 359 if (control) { 360 if (sbappendcontrol(&so2->so_rcv, m, control)) 361 control = 0; 362 } else 363 sbappend(&so2->so_rcv, m); 364 so->so_snd.sb_mbmax -= 365 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt; 366 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt; 367 newhiwat = so->so_snd.sb_hiwat - 368 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc); 369 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat, 370 newhiwat, RLIM_INFINITY); 371 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc; 372 sorwakeup(so2); 373 m = 0; 374 break; 375 376 default: 377 panic("uipc_send unknown socktype"); 378 } 379 380 /* 381 * SEND_EOF is equivalent to a SEND followed by 382 * a SHUTDOWN. 383 */ 384 if (flags & PRUS_EOF) { 385 socantsendmore(so); 386 unp_shutdown(unp); 387 } 388 389 if (control && error != 0) 390 unp_dispose(control); 391 392release: 393 if (control) 394 m_freem(control); 395 if (m) 396 m_freem(m); 397 return error; 398} 399 400static int 401uipc_sense(struct socket *so, struct stat *sb) 402{ 403 struct unpcb *unp = sotounpcb(so); 404 struct socket *so2; 405 406 if (unp == 0) 407 return EINVAL; 408 sb->st_blksize = so->so_snd.sb_hiwat; 409 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 410 so2 = unp->unp_conn->unp_socket; 411 sb->st_blksize += so2->so_rcv.sb_cc; 412 } 413 sb->st_dev = NOUDEV; 414 if (unp->unp_ino == 0) 415 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 416 sb->st_ino = unp->unp_ino; 417 return (0); 418} 419 420static int 421uipc_shutdown(struct socket *so) 422{ 423 struct unpcb *unp = sotounpcb(so); 424 425 if (unp == 0) 426 return EINVAL; 427 socantsendmore(so); 428 unp_shutdown(unp); 429 return 0; 430} 431 432static int 433uipc_sockaddr(struct socket *so, struct sockaddr **nam) 434{ 435 struct unpcb *unp = sotounpcb(so); 436 437 if (unp == 0) 438 return EINVAL; 439 if (unp->unp_addr) 440 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1); 441 else 442 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 443 return 0; 444} 445 446struct pr_usrreqs uipc_usrreqs = { 447 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect, 448 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect, 449 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp, 450 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr, 451 sosend, soreceive, sopoll 452}; 453 454int 455uipc_ctloutput(so, sopt) 456 struct socket *so; 457 struct sockopt *sopt; 458{ 459 struct unpcb *unp = sotounpcb(so); 460 int error; 461 462 switch (sopt->sopt_dir) { 463 case SOPT_GET: 464 switch (sopt->sopt_name) { 465 case LOCAL_PEERCRED: 466 if (unp->unp_flags & UNP_HAVEPC) 467 error = sooptcopyout(sopt, &unp->unp_peercred, 468 sizeof(unp->unp_peercred)); 469 else { 470 if (so->so_type == SOCK_STREAM) 471 error = ENOTCONN; 472 else 473 error = EINVAL; 474 } 475 break; 476 default: 477 error = EOPNOTSUPP; 478 break; 479 } 480 break; 481 case SOPT_SET: 482 default: 483 error = EOPNOTSUPP; 484 break; 485 } 486 return (error); 487} 488 489/* 490 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 491 * for stream sockets, although the total for sender and receiver is 492 * actually only PIPSIZ. 493 * Datagram sockets really use the sendspace as the maximum datagram size, 494 * and don't really want to reserve the sendspace. Their recvspace should 495 * be large enough for at least one max-size datagram plus address. 496 */ 497#ifndef PIPSIZ 498#define PIPSIZ 8192 499#endif 500static u_long unpst_sendspace = PIPSIZ; 501static u_long unpst_recvspace = PIPSIZ; 502static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 503static u_long unpdg_recvspace = 4*1024; 504 505static int unp_rights; /* file descriptors in flight */ 506 507SYSCTL_DECL(_net_local_stream); 508SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 509 &unpst_sendspace, 0, ""); 510SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 511 &unpst_recvspace, 0, ""); 512SYSCTL_DECL(_net_local_dgram); 513SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 514 &unpdg_sendspace, 0, ""); 515SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 516 &unpdg_recvspace, 0, ""); 517SYSCTL_DECL(_net_local); 518SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 519 520static int 521unp_attach(so) 522 struct socket *so; 523{ 524 register struct unpcb *unp; 525 int error; 526 527 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 528 switch (so->so_type) { 529 530 case SOCK_STREAM: 531 error = soreserve(so, unpst_sendspace, unpst_recvspace); 532 break; 533 534 case SOCK_DGRAM: 535 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 536 break; 537 538 default: 539 panic("unp_attach"); 540 } 541 if (error) 542 return (error); 543 } 544 unp = uma_zalloc(unp_zone, M_WAITOK); 545 if (unp == NULL) 546 return (ENOBUFS); 547 bzero(unp, sizeof *unp); 548 unp->unp_gencnt = ++unp_gencnt; 549 unp_count++; 550 LIST_INIT(&unp->unp_refs); 551 unp->unp_socket = so; 552 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 553 : &unp_shead, unp, unp_link); 554 so->so_pcb = unp; 555 return (0); 556} 557 558static void 559unp_detach(unp) 560 register struct unpcb *unp; 561{ 562 LIST_REMOVE(unp, unp_link); 563 unp->unp_gencnt = ++unp_gencnt; 564 --unp_count; 565 if (unp->unp_vnode) { 566 unp->unp_vnode->v_socket = 0; 567 vrele(unp->unp_vnode); 568 unp->unp_vnode = 0; 569 } 570 if (unp->unp_conn) 571 unp_disconnect(unp); 572 while (!LIST_EMPTY(&unp->unp_refs)) 573 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 574 soisdisconnected(unp->unp_socket); 575 unp->unp_socket->so_pcb = 0; 576 if (unp_rights) { 577 /* 578 * Normally the receive buffer is flushed later, 579 * in sofree, but if our receive buffer holds references 580 * to descriptors that are now garbage, we will dispose 581 * of those descriptor references after the garbage collector 582 * gets them (resulting in a "panic: closef: count < 0"). 583 */ 584 sorflush(unp->unp_socket); 585 unp_gc(); 586 } 587 if (unp->unp_addr) 588 FREE(unp->unp_addr, M_SONAME); 589 uma_zfree(unp_zone, unp); 590} 591 592static int 593unp_bind(unp, nam, td) 594 struct unpcb *unp; 595 struct sockaddr *nam; 596 struct thread *td; 597{ 598 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 599 struct vnode *vp; 600 struct mount *mp; 601 struct vattr vattr; 602 int error, namelen; 603 struct nameidata nd; 604 char *buf; 605 606 if (unp->unp_vnode != NULL) 607 return (EINVAL); 608 609 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 610 if (namelen <= 0) 611 return EINVAL; 612 613 buf = malloc(namelen + 1, M_TEMP, M_WAITOK); 614 strlcpy(buf, soun->sun_path, namelen + 1); 615 616restart: 617 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE, 618 buf, td); 619/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 620 error = namei(&nd); 621 if (error) { 622 free(buf, M_TEMP); 623 return (error); 624 } 625 vp = nd.ni_vp; 626 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 627 NDFREE(&nd, NDF_ONLY_PNBUF); 628 if (nd.ni_dvp == vp) 629 vrele(nd.ni_dvp); 630 else 631 vput(nd.ni_dvp); 632 if (vp != NULL) { 633 vrele(vp); 634 free(buf, M_TEMP); 635 return (EADDRINUSE); 636 } 637 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 638 if (error) { 639 free(buf, M_TEMP); 640 return (error); 641 } 642 goto restart; 643 } 644 VATTR_NULL(&vattr); 645 vattr.va_type = VSOCK; 646 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 647#ifdef MAC 648 error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 649 &vattr); 650#endif 651 if (error == 0) { 652 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 653 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 654 } 655 NDFREE(&nd, NDF_ONLY_PNBUF); 656 vput(nd.ni_dvp); 657 if (error) { 658 free(buf, M_TEMP); 659 return (error); 660 } 661 vp = nd.ni_vp; 662 vp->v_socket = unp->unp_socket; 663 unp->unp_vnode = vp; 664 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1); 665 VOP_UNLOCK(vp, 0, td); 666 vn_finished_write(mp); 667 free(buf, M_TEMP); 668 return (0); 669} 670 671static int 672unp_connect(so, nam, td) 673 struct socket *so; 674 struct sockaddr *nam; 675 struct thread *td; 676{ 677 register struct sockaddr_un *soun = (struct sockaddr_un *)nam; 678 register struct vnode *vp; 679 register struct socket *so2, *so3; 680 struct unpcb *unp, *unp2, *unp3; 681 int error, len; 682 struct nameidata nd; 683 char buf[SOCK_MAXADDRLEN]; 684 685 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 686 if (len <= 0) 687 return EINVAL; 688 strlcpy(buf, soun->sun_path, len + 1); 689 690 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td); 691 error = namei(&nd); 692 if (error) 693 return (error); 694 vp = nd.ni_vp; 695 NDFREE(&nd, NDF_ONLY_PNBUF); 696 if (vp->v_type != VSOCK) { 697 error = ENOTSOCK; 698 goto bad; 699 } 700 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 701 if (error) 702 goto bad; 703 so2 = vp->v_socket; 704 if (so2 == 0) { 705 error = ECONNREFUSED; 706 goto bad; 707 } 708 if (so->so_type != so2->so_type) { 709 error = EPROTOTYPE; 710 goto bad; 711 } 712 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 713 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 714 (so3 = sonewconn(so2, 0)) == 0) { 715 error = ECONNREFUSED; 716 goto bad; 717 } 718 unp = sotounpcb(so); 719 unp2 = sotounpcb(so2); 720 unp3 = sotounpcb(so3); 721 if (unp2->unp_addr) 722 unp3->unp_addr = (struct sockaddr_un *) 723 dup_sockaddr((struct sockaddr *) 724 unp2->unp_addr, 1); 725 726 /* 727 * unp_peercred management: 728 * 729 * The connecter's (client's) credentials are copied 730 * from its process structure at the time of connect() 731 * (which is now). 732 */ 733 cru2x(td->td_ucred, &unp3->unp_peercred); 734 unp3->unp_flags |= UNP_HAVEPC; 735 /* 736 * The receiver's (server's) credentials are copied 737 * from the unp_peercred member of socket on which the 738 * former called listen(); unp_listen() cached that 739 * process's credentials at that time so we can use 740 * them now. 741 */ 742 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 743 ("unp_connect: listener without cached peercred")); 744 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 745 sizeof(unp->unp_peercred)); 746 unp->unp_flags |= UNP_HAVEPC; 747#ifdef MAC 748 mac_set_socket_peer_from_socket(so, so3); 749 mac_set_socket_peer_from_socket(so3, so); 750#endif 751 752 so2 = so3; 753 } 754 error = unp_connect2(so, so2); 755bad: 756 vput(vp); 757 return (error); 758} 759 760int 761unp_connect2(so, so2) 762 register struct socket *so; 763 register struct socket *so2; 764{ 765 register struct unpcb *unp = sotounpcb(so); 766 register struct unpcb *unp2; 767 768 if (so2->so_type != so->so_type) 769 return (EPROTOTYPE); 770 unp2 = sotounpcb(so2); 771 unp->unp_conn = unp2; 772 switch (so->so_type) { 773 774 case SOCK_DGRAM: 775 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 776 soisconnected(so); 777 break; 778 779 case SOCK_STREAM: 780 unp2->unp_conn = unp; 781 soisconnected(so); 782 soisconnected(so2); 783 break; 784 785 default: 786 panic("unp_connect2"); 787 } 788 return (0); 789} 790 791static void 792unp_disconnect(unp) 793 struct unpcb *unp; 794{ 795 register struct unpcb *unp2 = unp->unp_conn; 796 797 if (unp2 == 0) 798 return; 799 unp->unp_conn = 0; 800 switch (unp->unp_socket->so_type) { 801 802 case SOCK_DGRAM: 803 LIST_REMOVE(unp, unp_reflink); 804 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 805 break; 806 807 case SOCK_STREAM: 808 soisdisconnected(unp->unp_socket); 809 unp2->unp_conn = 0; 810 soisdisconnected(unp2->unp_socket); 811 break; 812 } 813} 814 815#ifdef notdef 816void 817unp_abort(unp) 818 struct unpcb *unp; 819{ 820 821 unp_detach(unp); 822} 823#endif 824 825static int 826unp_pcblist(SYSCTL_HANDLER_ARGS) 827{ 828 int error, i, n; 829 struct unpcb *unp, **unp_list; 830 unp_gen_t gencnt; 831 struct xunpgen *xug; 832 struct unp_head *head; 833 struct xunpcb *xu; 834 835 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 836 837 /* 838 * The process of preparing the PCB list is too time-consuming and 839 * resource-intensive to repeat twice on every request. 840 */ 841 if (req->oldptr == 0) { 842 n = unp_count; 843 req->oldidx = 2 * (sizeof *xug) 844 + (n + n/8) * sizeof(struct xunpcb); 845 return 0; 846 } 847 848 if (req->newptr != 0) 849 return EPERM; 850 851 /* 852 * OK, now we're committed to doing something. 853 */ 854 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 855 gencnt = unp_gencnt; 856 n = unp_count; 857 858 xug->xug_len = sizeof *xug; 859 xug->xug_count = n; 860 xug->xug_gen = gencnt; 861 xug->xug_sogen = so_gencnt; 862 error = SYSCTL_OUT(req, xug, sizeof *xug); 863 if (error) { 864 free(xug, M_TEMP); 865 return error; 866 } 867 868 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 869 870 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 871 unp = LIST_NEXT(unp, unp_link)) { 872 if (unp->unp_gencnt <= gencnt) { 873 if (cr_cansee(req->td->td_ucred, 874 unp->unp_socket->so_cred)) 875 continue; 876 unp_list[i++] = unp; 877 } 878 } 879 n = i; /* in case we lost some during malloc */ 880 881 error = 0; 882 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK); 883 for (i = 0; i < n; i++) { 884 unp = unp_list[i]; 885 if (unp->unp_gencnt <= gencnt) { 886 xu->xu_len = sizeof *xu; 887 xu->xu_unpp = unp; 888 /* 889 * XXX - need more locking here to protect against 890 * connect/disconnect races for SMP. 891 */ 892 if (unp->unp_addr) 893 bcopy(unp->unp_addr, &xu->xu_addr, 894 unp->unp_addr->sun_len); 895 if (unp->unp_conn && unp->unp_conn->unp_addr) 896 bcopy(unp->unp_conn->unp_addr, 897 &xu->xu_caddr, 898 unp->unp_conn->unp_addr->sun_len); 899 bcopy(unp, &xu->xu_unp, sizeof *unp); 900 sotoxsocket(unp->unp_socket, &xu->xu_socket); 901 error = SYSCTL_OUT(req, xu, sizeof *xu); 902 } 903 } 904 free(xu, M_TEMP); 905 if (!error) { 906 /* 907 * Give the user an updated idea of our state. 908 * If the generation differs from what we told 909 * her before, she knows that something happened 910 * while we were processing this request, and it 911 * might be necessary to retry. 912 */ 913 xug->xug_gen = unp_gencnt; 914 xug->xug_sogen = so_gencnt; 915 xug->xug_count = unp_count; 916 error = SYSCTL_OUT(req, xug, sizeof *xug); 917 } 918 free(unp_list, M_TEMP); 919 free(xug, M_TEMP); 920 return error; 921} 922 923SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 924 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 925 "List of active local datagram sockets"); 926SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 927 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 928 "List of active local stream sockets"); 929 930static void 931unp_shutdown(unp) 932 struct unpcb *unp; 933{ 934 struct socket *so; 935 936 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 937 (so = unp->unp_conn->unp_socket)) 938 socantrcvmore(so); 939} 940 941static void 942unp_drop(unp, errno) 943 struct unpcb *unp; 944 int errno; 945{ 946 struct socket *so = unp->unp_socket; 947 948 so->so_error = errno; 949 unp_disconnect(unp); 950} 951 952#ifdef notdef 953void 954unp_drain() 955{ 956 957} 958#endif 959 960static void 961unp_freerights(rp, fdcount) 962 struct file **rp; 963 int fdcount; 964{ 965 int i; 966 struct file *fp; 967 968 for (i = 0; i < fdcount; i++) { 969 fp = *rp; 970 /* 971 * zero the pointer before calling 972 * unp_discard since it may end up 973 * in unp_gc().. 974 */ 975 *rp++ = 0; 976 unp_discard(fp); 977 } 978} 979 980int 981unp_externalize(control, controlp) 982 struct mbuf *control, **controlp; 983{ 984 struct thread *td = curthread; /* XXX */ 985 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 986 int i; 987 int *fdp; 988 struct file **rp; 989 struct file *fp; 990 void *data; 991 socklen_t clen = control->m_len, datalen; 992 int error, newfds; 993 int f; 994 u_int newlen; 995 996 error = 0; 997 if (controlp != NULL) /* controlp == NULL => free control messages */ 998 *controlp = NULL; 999 1000 while (cm != NULL) { 1001 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 1002 error = EINVAL; 1003 break; 1004 } 1005 1006 data = CMSG_DATA(cm); 1007 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1008 1009 if (cm->cmsg_level == SOL_SOCKET 1010 && cm->cmsg_type == SCM_RIGHTS) { 1011 newfds = datalen / sizeof(struct file *); 1012 rp = data; 1013 1014 /* If we're not outputting the descriptors free them. */ 1015 if (error || controlp == NULL) { 1016 unp_freerights(rp, newfds); 1017 goto next; 1018 } 1019 FILEDESC_LOCK(td->td_proc->p_fd); 1020 /* if the new FD's will not fit free them. */ 1021 if (!fdavail(td, newfds)) { 1022 FILEDESC_UNLOCK(td->td_proc->p_fd); 1023 error = EMSGSIZE; 1024 unp_freerights(rp, newfds); 1025 goto next; 1026 } 1027 /* 1028 * now change each pointer to an fd in the global 1029 * table to an integer that is the index to the 1030 * local fd table entry that we set up to point 1031 * to the global one we are transferring. 1032 */ 1033 newlen = newfds * sizeof(int); 1034 *controlp = sbcreatecontrol(NULL, newlen, 1035 SCM_RIGHTS, SOL_SOCKET); 1036 if (*controlp == NULL) { 1037 FILEDESC_UNLOCK(td->td_proc->p_fd); 1038 error = E2BIG; 1039 unp_freerights(rp, newfds); 1040 goto next; 1041 } 1042 1043 fdp = (int *) 1044 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1045 for (i = 0; i < newfds; i++) { 1046 if (fdalloc(td, 0, &f)) 1047 panic("unp_externalize fdalloc failed"); 1048 fp = *rp++; 1049 td->td_proc->p_fd->fd_ofiles[f] = fp; 1050 FILE_LOCK(fp); 1051 fp->f_msgcount--; 1052 FILE_UNLOCK(fp); 1053 unp_rights--; 1054 *fdp++ = f; 1055 } 1056 FILEDESC_UNLOCK(td->td_proc->p_fd); 1057 } else { /* We can just copy anything else across */ 1058 if (error || controlp == NULL) 1059 goto next; 1060 *controlp = sbcreatecontrol(NULL, datalen, 1061 cm->cmsg_type, cm->cmsg_level); 1062 if (*controlp == NULL) { 1063 error = ENOBUFS; 1064 goto next; 1065 } 1066 bcopy(data, 1067 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1068 datalen); 1069 } 1070 1071 controlp = &(*controlp)->m_next; 1072 1073next: 1074 if (CMSG_SPACE(datalen) < clen) { 1075 clen -= CMSG_SPACE(datalen); 1076 cm = (struct cmsghdr *) 1077 ((caddr_t)cm + CMSG_SPACE(datalen)); 1078 } else { 1079 clen = 0; 1080 cm = NULL; 1081 } 1082 } 1083 1084 m_freem(control); 1085 1086 return (error); 1087} 1088 1089void 1090unp_init(void) 1091{ 1092 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1093 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1094 uma_zone_set_max(unp_zone, nmbclusters); 1095 if (unp_zone == 0) 1096 panic("unp_init"); 1097 LIST_INIT(&unp_dhead); 1098 LIST_INIT(&unp_shead); 1099} 1100 1101static int 1102unp_internalize(controlp, td) 1103 struct mbuf **controlp; 1104 struct thread *td; 1105{ 1106 struct mbuf *control = *controlp; 1107 struct proc *p = td->td_proc; 1108 struct filedesc *fdescp = p->p_fd; 1109 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1110 struct cmsgcred *cmcred; 1111 struct file **rp; 1112 struct file *fp; 1113 struct timeval *tv; 1114 int i, fd, *fdp; 1115 void *data; 1116 socklen_t clen = control->m_len, datalen; 1117 int error, oldfds; 1118 u_int newlen; 1119 1120 error = 0; 1121 *controlp = NULL; 1122 1123 while (cm != NULL) { 1124 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1125 || cm->cmsg_len > clen) { 1126 error = EINVAL; 1127 goto out; 1128 } 1129 1130 data = CMSG_DATA(cm); 1131 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1132 1133 switch (cm->cmsg_type) { 1134 /* 1135 * Fill in credential information. 1136 */ 1137 case SCM_CREDS: 1138 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1139 SCM_CREDS, SOL_SOCKET); 1140 if (*controlp == NULL) { 1141 error = ENOBUFS; 1142 goto out; 1143 } 1144 1145 cmcred = (struct cmsgcred *) 1146 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1147 cmcred->cmcred_pid = p->p_pid; 1148 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1149 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1150 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1151 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1152 CMGROUP_MAX); 1153 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1154 cmcred->cmcred_groups[i] = 1155 td->td_ucred->cr_groups[i]; 1156 break; 1157 1158 case SCM_RIGHTS: 1159 oldfds = datalen / sizeof (int); 1160 /* 1161 * check that all the FDs passed in refer to legal files 1162 * If not, reject the entire operation. 1163 */ 1164 fdp = data; 1165 FILEDESC_LOCK(fdescp); 1166 for (i = 0; i < oldfds; i++) { 1167 fd = *fdp++; 1168 if ((unsigned)fd >= fdescp->fd_nfiles || 1169 fdescp->fd_ofiles[fd] == NULL) { 1170 FILEDESC_UNLOCK(fdescp); 1171 error = EBADF; 1172 goto out; 1173 } 1174 fp = fdescp->fd_ofiles[fd]; 1175 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) { 1176 FILEDESC_UNLOCK(fdescp); 1177 error = EOPNOTSUPP; 1178 goto out; 1179 } 1180 1181 } 1182 /* 1183 * Now replace the integer FDs with pointers to 1184 * the associated global file table entry.. 1185 */ 1186 newlen = oldfds * sizeof(struct file *); 1187 *controlp = sbcreatecontrol(NULL, newlen, 1188 SCM_RIGHTS, SOL_SOCKET); 1189 if (*controlp == NULL) { 1190 FILEDESC_UNLOCK(fdescp); 1191 error = E2BIG; 1192 goto out; 1193 } 1194 1195 fdp = data; 1196 rp = (struct file **) 1197 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1198 for (i = 0; i < oldfds; i++) { 1199 fp = fdescp->fd_ofiles[*fdp++]; 1200 *rp++ = fp; 1201 FILE_LOCK(fp); 1202 fp->f_count++; 1203 fp->f_msgcount++; 1204 FILE_UNLOCK(fp); 1205 unp_rights++; 1206 } 1207 FILEDESC_UNLOCK(fdescp); 1208 break; 1209 1210 case SCM_TIMESTAMP: 1211 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 1212 SCM_TIMESTAMP, SOL_SOCKET); 1213 if (*controlp == NULL) { 1214 error = ENOBUFS; 1215 goto out; 1216 } 1217 tv = (struct timeval *) 1218 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1219 microtime(tv); 1220 break; 1221 1222 default: 1223 error = EINVAL; 1224 goto out; 1225 } 1226 1227 controlp = &(*controlp)->m_next; 1228 1229 if (CMSG_SPACE(datalen) < clen) { 1230 clen -= CMSG_SPACE(datalen); 1231 cm = (struct cmsghdr *) 1232 ((caddr_t)cm + CMSG_SPACE(datalen)); 1233 } else { 1234 clen = 0; 1235 cm = NULL; 1236 } 1237 } 1238 1239out: 1240 m_freem(control); 1241 1242 return (error); 1243} 1244 1245static int unp_defer, unp_gcing; 1246 1247static void 1248unp_gc() 1249{ 1250 register struct file *fp, *nextfp; 1251 register struct socket *so; 1252 struct file **extra_ref, **fpp; 1253 int nunref, i; 1254 1255 if (unp_gcing) 1256 return; 1257 unp_gcing = 1; 1258 unp_defer = 0; 1259 /* 1260 * before going through all this, set all FDs to 1261 * be NOT defered and NOT externally accessible 1262 */ 1263 sx_slock(&filelist_lock); 1264 LIST_FOREACH(fp, &filehead, f_list) 1265 fp->f_gcflag &= ~(FMARK|FDEFER); 1266 do { 1267 LIST_FOREACH(fp, &filehead, f_list) { 1268 FILE_LOCK(fp); 1269 /* 1270 * If the file is not open, skip it 1271 */ 1272 if (fp->f_count == 0) { 1273 FILE_UNLOCK(fp); 1274 continue; 1275 } 1276 /* 1277 * If we already marked it as 'defer' in a 1278 * previous pass, then try process it this time 1279 * and un-mark it 1280 */ 1281 if (fp->f_gcflag & FDEFER) { 1282 fp->f_gcflag &= ~FDEFER; 1283 unp_defer--; 1284 } else { 1285 /* 1286 * if it's not defered, then check if it's 1287 * already marked.. if so skip it 1288 */ 1289 if (fp->f_gcflag & FMARK) { 1290 FILE_UNLOCK(fp); 1291 continue; 1292 } 1293 /* 1294 * If all references are from messages 1295 * in transit, then skip it. it's not 1296 * externally accessible. 1297 */ 1298 if (fp->f_count == fp->f_msgcount) { 1299 FILE_UNLOCK(fp); 1300 continue; 1301 } 1302 /* 1303 * If it got this far then it must be 1304 * externally accessible. 1305 */ 1306 fp->f_gcflag |= FMARK; 1307 } 1308 /* 1309 * either it was defered, or it is externally 1310 * accessible and not already marked so. 1311 * Now check if it is possibly one of OUR sockets. 1312 */ 1313 if (fp->f_type != DTYPE_SOCKET || 1314 (so = fp->f_data) == NULL) { 1315 FILE_UNLOCK(fp); 1316 continue; 1317 } 1318 FILE_UNLOCK(fp); 1319 if (so->so_proto->pr_domain != &localdomain || 1320 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 1321 continue; 1322#ifdef notdef 1323 if (so->so_rcv.sb_flags & SB_LOCK) { 1324 /* 1325 * This is problematical; it's not clear 1326 * we need to wait for the sockbuf to be 1327 * unlocked (on a uniprocessor, at least), 1328 * and it's also not clear what to do 1329 * if sbwait returns an error due to receipt 1330 * of a signal. If sbwait does return 1331 * an error, we'll go into an infinite 1332 * loop. Delete all of this for now. 1333 */ 1334 (void) sbwait(&so->so_rcv); 1335 goto restart; 1336 } 1337#endif 1338 /* 1339 * So, Ok, it's one of our sockets and it IS externally 1340 * accessible (or was defered). Now we look 1341 * to see if we hold any file descriptors in its 1342 * message buffers. Follow those links and mark them 1343 * as accessible too. 1344 */ 1345 unp_scan(so->so_rcv.sb_mb, unp_mark); 1346 } 1347 } while (unp_defer); 1348 sx_sunlock(&filelist_lock); 1349 /* 1350 * We grab an extra reference to each of the file table entries 1351 * that are not otherwise accessible and then free the rights 1352 * that are stored in messages on them. 1353 * 1354 * The bug in the orginal code is a little tricky, so I'll describe 1355 * what's wrong with it here. 1356 * 1357 * It is incorrect to simply unp_discard each entry for f_msgcount 1358 * times -- consider the case of sockets A and B that contain 1359 * references to each other. On a last close of some other socket, 1360 * we trigger a gc since the number of outstanding rights (unp_rights) 1361 * is non-zero. If during the sweep phase the gc code un_discards, 1362 * we end up doing a (full) closef on the descriptor. A closef on A 1363 * results in the following chain. Closef calls soo_close, which 1364 * calls soclose. Soclose calls first (through the switch 1365 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1366 * returns because the previous instance had set unp_gcing, and 1367 * we return all the way back to soclose, which marks the socket 1368 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1369 * to free up the rights that are queued in messages on the socket A, 1370 * i.e., the reference on B. The sorflush calls via the dom_dispose 1371 * switch unp_dispose, which unp_scans with unp_discard. This second 1372 * instance of unp_discard just calls closef on B. 1373 * 1374 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1375 * which results in another closef on A. Unfortunately, A is already 1376 * being closed, and the descriptor has already been marked with 1377 * SS_NOFDREF, and soclose panics at this point. 1378 * 1379 * Here, we first take an extra reference to each inaccessible 1380 * descriptor. Then, we call sorflush ourself, since we know 1381 * it is a Unix domain socket anyhow. After we destroy all the 1382 * rights carried in messages, we do a last closef to get rid 1383 * of our extra reference. This is the last close, and the 1384 * unp_detach etc will shut down the socket. 1385 * 1386 * 91/09/19, bsy@cs.cmu.edu 1387 */ 1388 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK); 1389 sx_slock(&filelist_lock); 1390 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0; 1391 fp = nextfp) { 1392 nextfp = LIST_NEXT(fp, f_list); 1393 FILE_LOCK(fp); 1394 /* 1395 * If it's not open, skip it 1396 */ 1397 if (fp->f_count == 0) { 1398 FILE_UNLOCK(fp); 1399 continue; 1400 } 1401 /* 1402 * If all refs are from msgs, and it's not marked accessible 1403 * then it must be referenced from some unreachable cycle 1404 * of (shut-down) FDs, so include it in our 1405 * list of FDs to remove 1406 */ 1407 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) { 1408 *fpp++ = fp; 1409 nunref++; 1410 fp->f_count++; 1411 } 1412 FILE_UNLOCK(fp); 1413 } 1414 sx_sunlock(&filelist_lock); 1415 /* 1416 * for each FD on our hit list, do the following two things 1417 */ 1418 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { 1419 struct file *tfp = *fpp; 1420 FILE_LOCK(tfp); 1421 if (tfp->f_type == DTYPE_SOCKET && 1422 tfp->f_data != NULL) { 1423 FILE_UNLOCK(tfp); 1424 sorflush(tfp->f_data); 1425 } else 1426 FILE_UNLOCK(tfp); 1427 } 1428 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) 1429 closef(*fpp, (struct thread *) NULL); 1430 free(extra_ref, M_TEMP); 1431 unp_gcing = 0; 1432} 1433 1434void 1435unp_dispose(m) 1436 struct mbuf *m; 1437{ 1438 1439 if (m) 1440 unp_scan(m, unp_discard); 1441} 1442 1443static int 1444unp_listen(unp, td) 1445 struct unpcb *unp; 1446 struct thread *td; 1447{ 1448 1449 cru2x(td->td_ucred, &unp->unp_peercred); 1450 unp->unp_flags |= UNP_HAVEPCCACHED; 1451 return (0); 1452} 1453 1454static void 1455unp_scan(m0, op) 1456 register struct mbuf *m0; 1457 void (*op)(struct file *); 1458{ 1459 struct mbuf *m; 1460 struct file **rp; 1461 struct cmsghdr *cm; 1462 void *data; 1463 int i; 1464 socklen_t clen, datalen; 1465 int qfds; 1466 1467 while (m0) { 1468 for (m = m0; m; m = m->m_next) { 1469 if (m->m_type != MT_CONTROL) 1470 continue; 1471 1472 cm = mtod(m, struct cmsghdr *); 1473 clen = m->m_len; 1474 1475 while (cm != NULL) { 1476 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 1477 break; 1478 1479 data = CMSG_DATA(cm); 1480 datalen = (caddr_t)cm + cm->cmsg_len 1481 - (caddr_t)data; 1482 1483 if (cm->cmsg_level == SOL_SOCKET && 1484 cm->cmsg_type == SCM_RIGHTS) { 1485 qfds = datalen / sizeof (struct file *); 1486 rp = data; 1487 for (i = 0; i < qfds; i++) 1488 (*op)(*rp++); 1489 } 1490 1491 if (CMSG_SPACE(datalen) < clen) { 1492 clen -= CMSG_SPACE(datalen); 1493 cm = (struct cmsghdr *) 1494 ((caddr_t)cm + CMSG_SPACE(datalen)); 1495 } else { 1496 clen = 0; 1497 cm = NULL; 1498 } 1499 } 1500 } 1501 m0 = m0->m_act; 1502 } 1503} 1504 1505static void 1506unp_mark(fp) 1507 struct file *fp; 1508{ 1509 if (fp->f_gcflag & FMARK) 1510 return; 1511 unp_defer++; 1512 fp->f_gcflag |= (FMARK|FDEFER); 1513} 1514 1515static void 1516unp_discard(fp) 1517 struct file *fp; 1518{ 1519 FILE_LOCK(fp); 1520 fp->f_msgcount--; 1521 unp_rights--; 1522 FILE_UNLOCK(fp); 1523 (void) closef(fp, (struct thread *)NULL); 1524} 1525