uipc_usrreq.c revision 101013
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 101013 2002-07-31 03:03:22Z rwatson $ 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/mbuf.h> 49#include <sys/mutex.h> 50#include <sys/namei.h> 51#include <sys/proc.h> 52#include <sys/protosw.h> 53#include <sys/resourcevar.h> 54#include <sys/socket.h> 55#include <sys/socketvar.h> 56#include <sys/signalvar.h> 57#include <sys/stat.h> 58#include <sys/sx.h> 59#include <sys/sysctl.h> 60#include <sys/systm.h> 61#include <sys/un.h> 62#include <sys/unpcb.h> 63#include <sys/vnode.h> 64 65#include <vm/uma.h> 66 67static uma_zone_t unp_zone; 68static unp_gen_t unp_gencnt; 69static u_int unp_count; 70 71static struct unp_head unp_shead, unp_dhead; 72 73/* 74 * Unix communications domain. 75 * 76 * TODO: 77 * SEQPACKET, RDM 78 * rethink name space problems 79 * need a proper out-of-band 80 * lock pushdown 81 */ 82static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 83static ino_t unp_ino; /* prototype for fake inode numbers */ 84 85static int unp_attach(struct socket *); 86static void unp_detach(struct unpcb *); 87static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *); 88static int unp_connect(struct socket *,struct sockaddr *, struct thread *); 89static void unp_disconnect(struct unpcb *); 90static void unp_shutdown(struct unpcb *); 91static void unp_drop(struct unpcb *, int); 92static void unp_gc(void); 93static void unp_scan(struct mbuf *, void (*)(struct file *)); 94static void unp_mark(struct file *); 95static void unp_discard(struct file *); 96static void unp_freerights(struct file **, int); 97static int unp_internalize(struct mbuf **, struct thread *); 98static int unp_listen(struct unpcb *, struct thread *); 99 100static int 101uipc_abort(struct socket *so) 102{ 103 struct unpcb *unp = sotounpcb(so); 104 105 if (unp == 0) 106 return EINVAL; 107 unp_drop(unp, ECONNABORTED); 108 unp_detach(unp); 109 sotryfree(so); 110 return 0; 111} 112 113static int 114uipc_accept(struct socket *so, struct sockaddr **nam) 115{ 116 struct unpcb *unp = sotounpcb(so); 117 118 if (unp == 0) 119 return EINVAL; 120 121 /* 122 * Pass back name of connected socket, 123 * if it was bound and we are still connected 124 * (our peer may have closed already!). 125 */ 126 if (unp->unp_conn && unp->unp_conn->unp_addr) { 127 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 128 1); 129 } else { 130 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 131 } 132 return 0; 133} 134 135static int 136uipc_attach(struct socket *so, int proto, struct thread *td) 137{ 138 struct unpcb *unp = sotounpcb(so); 139 140 if (unp != 0) 141 return EISCONN; 142 return unp_attach(so); 143} 144 145static int 146uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 147{ 148 struct unpcb *unp = sotounpcb(so); 149 150 if (unp == 0) 151 return EINVAL; 152 153 return unp_bind(unp, nam, td); 154} 155 156static int 157uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 158{ 159 struct unpcb *unp = sotounpcb(so); 160 161 if (unp == 0) 162 return EINVAL; 163 return unp_connect(so, nam, curthread); 164} 165 166static int 167uipc_connect2(struct socket *so1, struct socket *so2) 168{ 169 struct unpcb *unp = sotounpcb(so1); 170 171 if (unp == 0) 172 return EINVAL; 173 174 return unp_connect2(so1, so2); 175} 176 177/* control is EOPNOTSUPP */ 178 179static int 180uipc_detach(struct socket *so) 181{ 182 struct unpcb *unp = sotounpcb(so); 183 184 if (unp == 0) 185 return EINVAL; 186 187 unp_detach(unp); 188 return 0; 189} 190 191static int 192uipc_disconnect(struct socket *so) 193{ 194 struct unpcb *unp = sotounpcb(so); 195 196 if (unp == 0) 197 return EINVAL; 198 unp_disconnect(unp); 199 return 0; 200} 201 202static int 203uipc_listen(struct socket *so, struct thread *td) 204{ 205 struct unpcb *unp = sotounpcb(so); 206 207 if (unp == 0 || unp->unp_vnode == 0) 208 return EINVAL; 209 return unp_listen(unp, td); 210} 211 212static int 213uipc_peeraddr(struct socket *so, struct sockaddr **nam) 214{ 215 struct unpcb *unp = sotounpcb(so); 216 217 if (unp == 0) 218 return EINVAL; 219 if (unp->unp_conn && unp->unp_conn->unp_addr) 220 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 221 1); 222 return 0; 223} 224 225static int 226uipc_rcvd(struct socket *so, int flags) 227{ 228 struct unpcb *unp = sotounpcb(so); 229 struct socket *so2; 230 u_long newhiwat; 231 232 if (unp == 0) 233 return EINVAL; 234 switch (so->so_type) { 235 case SOCK_DGRAM: 236 panic("uipc_rcvd DGRAM?"); 237 /*NOTREACHED*/ 238 239 case SOCK_STREAM: 240 if (unp->unp_conn == 0) 241 break; 242 so2 = unp->unp_conn->unp_socket; 243 /* 244 * Adjust backpressure on sender 245 * and wakeup any waiting to write. 246 */ 247 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt; 248 unp->unp_mbcnt = so->so_rcv.sb_mbcnt; 249 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - 250 so->so_rcv.sb_cc; 251 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat, 252 newhiwat, RLIM_INFINITY); 253 unp->unp_cc = so->so_rcv.sb_cc; 254 sowwakeup(so2); 255 break; 256 257 default: 258 panic("uipc_rcvd unknown socktype"); 259 } 260 return 0; 261} 262 263/* pru_rcvoob is EOPNOTSUPP */ 264 265static int 266uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 267 struct mbuf *control, struct thread *td) 268{ 269 int error = 0; 270 struct unpcb *unp = sotounpcb(so); 271 struct socket *so2; 272 u_long newhiwat; 273 274 if (unp == 0) { 275 error = EINVAL; 276 goto release; 277 } 278 if (flags & PRUS_OOB) { 279 error = EOPNOTSUPP; 280 goto release; 281 } 282 283 if (control && (error = unp_internalize(&control, td))) 284 goto release; 285 286 switch (so->so_type) { 287 case SOCK_DGRAM: 288 { 289 struct sockaddr *from; 290 291 if (nam) { 292 if (unp->unp_conn) { 293 error = EISCONN; 294 break; 295 } 296 error = unp_connect(so, nam, td); 297 if (error) 298 break; 299 } else { 300 if (unp->unp_conn == 0) { 301 error = ENOTCONN; 302 break; 303 } 304 } 305 so2 = unp->unp_conn->unp_socket; 306 if (unp->unp_addr) 307 from = (struct sockaddr *)unp->unp_addr; 308 else 309 from = &sun_noname; 310 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 311 sorwakeup(so2); 312 m = 0; 313 control = 0; 314 } else 315 error = ENOBUFS; 316 if (nam) 317 unp_disconnect(unp); 318 break; 319 } 320 321 case SOCK_STREAM: 322 /* Connect if not connected yet. */ 323 /* 324 * Note: A better implementation would complain 325 * if not equal to the peer's address. 326 */ 327 if ((so->so_state & SS_ISCONNECTED) == 0) { 328 if (nam) { 329 error = unp_connect(so, nam, td); 330 if (error) 331 break; /* XXX */ 332 } else { 333 error = ENOTCONN; 334 break; 335 } 336 } 337 338 if (so->so_state & SS_CANTSENDMORE) { 339 error = EPIPE; 340 break; 341 } 342 if (unp->unp_conn == 0) 343 panic("uipc_send connected but no connection?"); 344 so2 = unp->unp_conn->unp_socket; 345 /* 346 * Send to paired receive port, and then reduce 347 * send buffer hiwater marks to maintain backpressure. 348 * Wake up readers. 349 */ 350 if (control) { 351 if (sbappendcontrol(&so2->so_rcv, m, control)) 352 control = 0; 353 } else 354 sbappend(&so2->so_rcv, m); 355 so->so_snd.sb_mbmax -= 356 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt; 357 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt; 358 newhiwat = so->so_snd.sb_hiwat - 359 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc); 360 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat, 361 newhiwat, RLIM_INFINITY); 362 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc; 363 sorwakeup(so2); 364 m = 0; 365 break; 366 367 default: 368 panic("uipc_send unknown socktype"); 369 } 370 371 /* 372 * SEND_EOF is equivalent to a SEND followed by 373 * a SHUTDOWN. 374 */ 375 if (flags & PRUS_EOF) { 376 socantsendmore(so); 377 unp_shutdown(unp); 378 } 379 380 if (control && error != 0) 381 unp_dispose(control); 382 383release: 384 if (control) 385 m_freem(control); 386 if (m) 387 m_freem(m); 388 return error; 389} 390 391static int 392uipc_sense(struct socket *so, struct stat *sb) 393{ 394 struct unpcb *unp = sotounpcb(so); 395 struct socket *so2; 396 397 if (unp == 0) 398 return EINVAL; 399 sb->st_blksize = so->so_snd.sb_hiwat; 400 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 401 so2 = unp->unp_conn->unp_socket; 402 sb->st_blksize += so2->so_rcv.sb_cc; 403 } 404 sb->st_dev = NOUDEV; 405 if (unp->unp_ino == 0) 406 unp->unp_ino = unp_ino++; 407 sb->st_ino = unp->unp_ino; 408 return (0); 409} 410 411static int 412uipc_shutdown(struct socket *so) 413{ 414 struct unpcb *unp = sotounpcb(so); 415 416 if (unp == 0) 417 return EINVAL; 418 socantsendmore(so); 419 unp_shutdown(unp); 420 return 0; 421} 422 423static int 424uipc_sockaddr(struct socket *so, struct sockaddr **nam) 425{ 426 struct unpcb *unp = sotounpcb(so); 427 428 if (unp == 0) 429 return EINVAL; 430 if (unp->unp_addr) 431 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1); 432 else 433 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 434 return 0; 435} 436 437struct pr_usrreqs uipc_usrreqs = { 438 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect, 439 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect, 440 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp, 441 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr, 442 sosend, soreceive, sopoll 443}; 444 445int 446uipc_ctloutput(so, sopt) 447 struct socket *so; 448 struct sockopt *sopt; 449{ 450 struct unpcb *unp = sotounpcb(so); 451 int error; 452 453 switch (sopt->sopt_dir) { 454 case SOPT_GET: 455 switch (sopt->sopt_name) { 456 case LOCAL_PEERCRED: 457 if (unp->unp_flags & UNP_HAVEPC) 458 error = sooptcopyout(sopt, &unp->unp_peercred, 459 sizeof(unp->unp_peercred)); 460 else { 461 if (so->so_type == SOCK_STREAM) 462 error = ENOTCONN; 463 else 464 error = EINVAL; 465 } 466 break; 467 default: 468 error = EOPNOTSUPP; 469 break; 470 } 471 break; 472 case SOPT_SET: 473 default: 474 error = EOPNOTSUPP; 475 break; 476 } 477 return (error); 478} 479 480/* 481 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 482 * for stream sockets, although the total for sender and receiver is 483 * actually only PIPSIZ. 484 * Datagram sockets really use the sendspace as the maximum datagram size, 485 * and don't really want to reserve the sendspace. Their recvspace should 486 * be large enough for at least one max-size datagram plus address. 487 */ 488#ifndef PIPSIZ 489#define PIPSIZ 8192 490#endif 491static u_long unpst_sendspace = PIPSIZ; 492static u_long unpst_recvspace = PIPSIZ; 493static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 494static u_long unpdg_recvspace = 4*1024; 495 496static int unp_rights; /* file descriptors in flight */ 497 498SYSCTL_DECL(_net_local_stream); 499SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 500 &unpst_sendspace, 0, ""); 501SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 502 &unpst_recvspace, 0, ""); 503SYSCTL_DECL(_net_local_dgram); 504SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 505 &unpdg_sendspace, 0, ""); 506SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 507 &unpdg_recvspace, 0, ""); 508SYSCTL_DECL(_net_local); 509SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 510 511static int 512unp_attach(so) 513 struct socket *so; 514{ 515 register struct unpcb *unp; 516 int error; 517 518 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 519 switch (so->so_type) { 520 521 case SOCK_STREAM: 522 error = soreserve(so, unpst_sendspace, unpst_recvspace); 523 break; 524 525 case SOCK_DGRAM: 526 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 527 break; 528 529 default: 530 panic("unp_attach"); 531 } 532 if (error) 533 return (error); 534 } 535 unp = uma_zalloc(unp_zone, M_WAITOK); 536 if (unp == NULL) 537 return (ENOBUFS); 538 bzero(unp, sizeof *unp); 539 unp->unp_gencnt = ++unp_gencnt; 540 unp_count++; 541 LIST_INIT(&unp->unp_refs); 542 unp->unp_socket = so; 543 FILEDESC_LOCK(curproc->p_fd); 544 unp->unp_rvnode = curthread->td_proc->p_fd->fd_rdir; 545 FILEDESC_UNLOCK(curproc->p_fd); 546 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 547 : &unp_shead, unp, unp_link); 548 so->so_pcb = unp; 549 return (0); 550} 551 552static void 553unp_detach(unp) 554 register struct unpcb *unp; 555{ 556 LIST_REMOVE(unp, unp_link); 557 unp->unp_gencnt = ++unp_gencnt; 558 --unp_count; 559 if (unp->unp_vnode) { 560 unp->unp_vnode->v_socket = 0; 561 vrele(unp->unp_vnode); 562 unp->unp_vnode = 0; 563 } 564 if (unp->unp_conn) 565 unp_disconnect(unp); 566 while (!LIST_EMPTY(&unp->unp_refs)) 567 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 568 soisdisconnected(unp->unp_socket); 569 unp->unp_socket->so_pcb = 0; 570 if (unp_rights) { 571 /* 572 * Normally the receive buffer is flushed later, 573 * in sofree, but if our receive buffer holds references 574 * to descriptors that are now garbage, we will dispose 575 * of those descriptor references after the garbage collector 576 * gets them (resulting in a "panic: closef: count < 0"). 577 */ 578 sorflush(unp->unp_socket); 579 unp_gc(); 580 } 581 if (unp->unp_addr) 582 FREE(unp->unp_addr, M_SONAME); 583 uma_zfree(unp_zone, unp); 584} 585 586static int 587unp_bind(unp, nam, td) 588 struct unpcb *unp; 589 struct sockaddr *nam; 590 struct thread *td; 591{ 592 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 593 struct vnode *vp; 594 struct mount *mp; 595 struct vattr vattr; 596 int error, namelen; 597 struct nameidata nd; 598 char *buf; 599 600 if (unp->unp_vnode != NULL) 601 return (EINVAL); 602 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 603 if (namelen <= 0) 604 return EINVAL; 605 buf = malloc(SOCK_MAXADDRLEN, M_TEMP, M_WAITOK); 606 strncpy(buf, soun->sun_path, namelen); 607 buf[namelen] = 0; /* null-terminate the string */ 608restart: 609 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT, UIO_SYSSPACE, 610 buf, td); 611/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 612 error = namei(&nd); 613 if (error) { 614 free(buf, M_TEMP); 615 return (error); 616 } 617 vp = nd.ni_vp; 618 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 619 NDFREE(&nd, NDF_ONLY_PNBUF); 620 if (nd.ni_dvp == vp) 621 vrele(nd.ni_dvp); 622 else 623 vput(nd.ni_dvp); 624 if (vp != NULL) { 625 vrele(vp); 626 free(buf, M_TEMP); 627 return (EADDRINUSE); 628 } 629 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 630 if (error) { 631 free(buf, M_TEMP); 632 return (error); 633 } 634 goto restart; 635 } 636 VATTR_NULL(&vattr); 637 vattr.va_type = VSOCK; 638 FILEDESC_LOCK(td->td_proc->p_fd); 639 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 640 FILEDESC_UNLOCK(td->td_proc->p_fd); 641 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 642 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 643 NDFREE(&nd, NDF_ONLY_PNBUF); 644 vput(nd.ni_dvp); 645 if (error) { 646 free(buf, M_TEMP); 647 return (error); 648 } 649 vp = nd.ni_vp; 650 vp->v_socket = unp->unp_socket; 651 unp->unp_vnode = vp; 652 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1); 653 VOP_UNLOCK(vp, 0, td); 654 vn_finished_write(mp); 655 free(buf, M_TEMP); 656 return (0); 657} 658 659static int 660unp_connect(so, nam, td) 661 struct socket *so; 662 struct sockaddr *nam; 663 struct thread *td; 664{ 665 register struct sockaddr_un *soun = (struct sockaddr_un *)nam; 666 register struct vnode *vp; 667 register struct socket *so2, *so3; 668 struct unpcb *unp, *unp2, *unp3; 669 int error, len; 670 struct nameidata nd; 671 char buf[SOCK_MAXADDRLEN]; 672 673 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 674 if (len <= 0) 675 return EINVAL; 676 strncpy(buf, soun->sun_path, len); 677 buf[len] = 0; 678 679 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td); 680 error = namei(&nd); 681 if (error) 682 return (error); 683 vp = nd.ni_vp; 684 NDFREE(&nd, NDF_ONLY_PNBUF); 685 if (vp->v_type != VSOCK) { 686 error = ENOTSOCK; 687 goto bad; 688 } 689 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 690 if (error) 691 goto bad; 692 so2 = vp->v_socket; 693 if (so2 == 0) { 694 error = ECONNREFUSED; 695 goto bad; 696 } 697 if (so->so_type != so2->so_type) { 698 error = EPROTOTYPE; 699 goto bad; 700 } 701 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 702 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 703 (so3 = sonewconn(so2, 0)) == 0) { 704 error = ECONNREFUSED; 705 goto bad; 706 } 707 unp = sotounpcb(so); 708 unp2 = sotounpcb(so2); 709 unp3 = sotounpcb(so3); 710 if (unp2->unp_addr) 711 unp3->unp_addr = (struct sockaddr_un *) 712 dup_sockaddr((struct sockaddr *) 713 unp2->unp_addr, 1); 714 715 /* 716 * unp_peercred management: 717 * 718 * The connecter's (client's) credentials are copied 719 * from its process structure at the time of connect() 720 * (which is now). 721 */ 722 cru2x(td->td_ucred, &unp3->unp_peercred); 723 unp3->unp_flags |= UNP_HAVEPC; 724 /* 725 * The receiver's (server's) credentials are copied 726 * from the unp_peercred member of socket on which the 727 * former called listen(); unp_listen() cached that 728 * process's credentials at that time so we can use 729 * them now. 730 */ 731 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 732 ("unp_connect: listener without cached peercred")); 733 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 734 sizeof(unp->unp_peercred)); 735 unp->unp_flags |= UNP_HAVEPC; 736#ifdef MAC 737 mac_set_socket_peer_from_socket(so, so3); 738 mac_set_socket_peer_from_socket(so3, so); 739#endif 740 741 so2 = so3; 742 } 743 error = unp_connect2(so, so2); 744bad: 745 vput(vp); 746 return (error); 747} 748 749int 750unp_connect2(so, so2) 751 register struct socket *so; 752 register struct socket *so2; 753{ 754 register struct unpcb *unp = sotounpcb(so); 755 register struct unpcb *unp2; 756 757 if (so2->so_type != so->so_type) 758 return (EPROTOTYPE); 759 unp2 = sotounpcb(so2); 760 unp->unp_conn = unp2; 761 switch (so->so_type) { 762 763 case SOCK_DGRAM: 764 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 765 soisconnected(so); 766 break; 767 768 case SOCK_STREAM: 769 unp2->unp_conn = unp; 770 soisconnected(so); 771 soisconnected(so2); 772 break; 773 774 default: 775 panic("unp_connect2"); 776 } 777 return (0); 778} 779 780static void 781unp_disconnect(unp) 782 struct unpcb *unp; 783{ 784 register struct unpcb *unp2 = unp->unp_conn; 785 786 if (unp2 == 0) 787 return; 788 unp->unp_conn = 0; 789 switch (unp->unp_socket->so_type) { 790 791 case SOCK_DGRAM: 792 LIST_REMOVE(unp, unp_reflink); 793 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 794 break; 795 796 case SOCK_STREAM: 797 soisdisconnected(unp->unp_socket); 798 unp2->unp_conn = 0; 799 soisdisconnected(unp2->unp_socket); 800 break; 801 } 802} 803 804#ifdef notdef 805void 806unp_abort(unp) 807 struct unpcb *unp; 808{ 809 810 unp_detach(unp); 811} 812#endif 813 814static int 815unp_pcblist(SYSCTL_HANDLER_ARGS) 816{ 817 int error, i, n; 818 struct unpcb *unp, **unp_list; 819 unp_gen_t gencnt; 820 struct xunpgen *xug; 821 struct unp_head *head; 822 struct xunpcb *xu; 823 824 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 825 826 /* 827 * The process of preparing the PCB list is too time-consuming and 828 * resource-intensive to repeat twice on every request. 829 */ 830 if (req->oldptr == 0) { 831 n = unp_count; 832 req->oldidx = 2 * (sizeof *xug) 833 + (n + n/8) * sizeof(struct xunpcb); 834 return 0; 835 } 836 837 if (req->newptr != 0) 838 return EPERM; 839 840 /* 841 * OK, now we're committed to doing something. 842 */ 843 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 844 gencnt = unp_gencnt; 845 n = unp_count; 846 847 xug->xug_len = sizeof *xug; 848 xug->xug_count = n; 849 xug->xug_gen = gencnt; 850 xug->xug_sogen = so_gencnt; 851 error = SYSCTL_OUT(req, xug, sizeof *xug); 852 if (error) { 853 free(xug, M_TEMP); 854 return error; 855 } 856 857 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 858 859 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 860 unp = LIST_NEXT(unp, unp_link)) { 861 if (unp->unp_gencnt <= gencnt) { 862 if (cr_cansee(req->td->td_ucred, 863 unp->unp_socket->so_cred)) 864 continue; 865 unp_list[i++] = unp; 866 } 867 } 868 n = i; /* in case we lost some during malloc */ 869 870 error = 0; 871 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK); 872 for (i = 0; i < n; i++) { 873 unp = unp_list[i]; 874 if (unp->unp_gencnt <= gencnt) { 875 xu->xu_len = sizeof *xu; 876 xu->xu_unpp = unp; 877 /* 878 * XXX - need more locking here to protect against 879 * connect/disconnect races for SMP. 880 */ 881 if (unp->unp_addr) 882 bcopy(unp->unp_addr, &xu->xu_addr, 883 unp->unp_addr->sun_len); 884 if (unp->unp_conn && unp->unp_conn->unp_addr) 885 bcopy(unp->unp_conn->unp_addr, 886 &xu->xu_caddr, 887 unp->unp_conn->unp_addr->sun_len); 888 bcopy(unp, &xu->xu_unp, sizeof *unp); 889 sotoxsocket(unp->unp_socket, &xu->xu_socket); 890 error = SYSCTL_OUT(req, xu, sizeof *xu); 891 } 892 } 893 free(xu, M_TEMP); 894 if (!error) { 895 /* 896 * Give the user an updated idea of our state. 897 * If the generation differs from what we told 898 * her before, she knows that something happened 899 * while we were processing this request, and it 900 * might be necessary to retry. 901 */ 902 xug->xug_gen = unp_gencnt; 903 xug->xug_sogen = so_gencnt; 904 xug->xug_count = unp_count; 905 error = SYSCTL_OUT(req, xug, sizeof *xug); 906 } 907 free(unp_list, M_TEMP); 908 free(xug, M_TEMP); 909 return error; 910} 911 912SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 913 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 914 "List of active local datagram sockets"); 915SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 916 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 917 "List of active local stream sockets"); 918 919static void 920unp_shutdown(unp) 921 struct unpcb *unp; 922{ 923 struct socket *so; 924 925 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 926 (so = unp->unp_conn->unp_socket)) 927 socantrcvmore(so); 928} 929 930static void 931unp_drop(unp, errno) 932 struct unpcb *unp; 933 int errno; 934{ 935 struct socket *so = unp->unp_socket; 936 937 so->so_error = errno; 938 unp_disconnect(unp); 939} 940 941#ifdef notdef 942void 943unp_drain() 944{ 945 946} 947#endif 948 949static void 950unp_freerights(rp, fdcount) 951 struct file **rp; 952 int fdcount; 953{ 954 int i; 955 struct file *fp; 956 957 for (i = 0; i < fdcount; i++) { 958 fp = *rp; 959 /* 960 * zero the pointer before calling 961 * unp_discard since it may end up 962 * in unp_gc().. 963 */ 964 *rp++ = 0; 965 unp_discard(fp); 966 } 967} 968 969int 970unp_externalize(control, controlp) 971 struct mbuf *control, **controlp; 972{ 973 struct thread *td = curthread; /* XXX */ 974 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 975 int i; 976 int *fdp; 977 struct file **rp; 978 struct file *fp; 979 void *data; 980 socklen_t clen = control->m_len, datalen; 981 int error, newfds; 982 int f; 983 u_int newlen; 984 985 error = 0; 986 if (controlp != NULL) /* controlp == NULL => free control messages */ 987 *controlp = NULL; 988 989 while (cm != NULL) { 990 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 991 error = EINVAL; 992 break; 993 } 994 995 data = CMSG_DATA(cm); 996 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 997 998 if (cm->cmsg_level == SOL_SOCKET 999 && cm->cmsg_type == SCM_RIGHTS) { 1000 newfds = datalen / sizeof(struct file *); 1001 rp = data; 1002 1003 /* If we're not outputting the discriptors free them. */ 1004 if (error || controlp == NULL) { 1005 unp_freerights(rp, newfds); 1006 goto next; 1007 } 1008 FILEDESC_LOCK(td->td_proc->p_fd); 1009 /* if the new FD's will not fit free them. */ 1010 if (!fdavail(td, newfds)) { 1011 FILEDESC_UNLOCK(td->td_proc->p_fd); 1012 error = EMSGSIZE; 1013 unp_freerights(rp, newfds); 1014 goto next; 1015 } 1016 /* 1017 * now change each pointer to an fd in the global 1018 * table to an integer that is the index to the 1019 * local fd table entry that we set up to point 1020 * to the global one we are transferring. 1021 */ 1022 newlen = newfds * sizeof(int); 1023 *controlp = sbcreatecontrol(NULL, newlen, 1024 SCM_RIGHTS, SOL_SOCKET); 1025 if (*controlp == NULL) { 1026 FILEDESC_UNLOCK(td->td_proc->p_fd); 1027 error = E2BIG; 1028 unp_freerights(rp, newfds); 1029 goto next; 1030 } 1031 1032 fdp = (int *) 1033 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1034 for (i = 0; i < newfds; i++) { 1035 if (fdalloc(td, 0, &f)) 1036 panic("unp_externalize fdalloc failed"); 1037 fp = *rp++; 1038 td->td_proc->p_fd->fd_ofiles[f] = fp; 1039 FILE_LOCK(fp); 1040 fp->f_msgcount--; 1041 FILE_UNLOCK(fp); 1042 unp_rights--; 1043 *fdp++ = f; 1044 } 1045 FILEDESC_UNLOCK(td->td_proc->p_fd); 1046 } else { /* We can just copy anything else across */ 1047 if (error || controlp == NULL) 1048 goto next; 1049 *controlp = sbcreatecontrol(NULL, datalen, 1050 cm->cmsg_type, cm->cmsg_level); 1051 if (*controlp == NULL) { 1052 error = ENOBUFS; 1053 goto next; 1054 } 1055 bcopy(data, 1056 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1057 datalen); 1058 } 1059 1060 controlp = &(*controlp)->m_next; 1061 1062next: 1063 if (CMSG_SPACE(datalen) < clen) { 1064 clen -= CMSG_SPACE(datalen); 1065 cm = (struct cmsghdr *) 1066 ((caddr_t)cm + CMSG_SPACE(datalen)); 1067 } else { 1068 clen = 0; 1069 cm = NULL; 1070 } 1071 } 1072 1073 m_freem(control); 1074 1075 return (error); 1076} 1077 1078void 1079unp_init(void) 1080{ 1081 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1082 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1083 uma_zone_set_max(unp_zone, nmbclusters); 1084 if (unp_zone == 0) 1085 panic("unp_init"); 1086 LIST_INIT(&unp_dhead); 1087 LIST_INIT(&unp_shead); 1088} 1089 1090#ifndef MIN 1091#define MIN(a,b) (((a)<(b))?(a):(b)) 1092#endif 1093 1094static int 1095unp_internalize(controlp, td) 1096 struct mbuf **controlp; 1097 struct thread *td; 1098{ 1099 struct mbuf *control = *controlp; 1100 struct proc *p = td->td_proc; 1101 struct filedesc *fdescp = p->p_fd; 1102 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1103 struct cmsgcred *cmcred; 1104 struct file **rp; 1105 struct file *fp; 1106 struct timeval *tv; 1107 int i, fd, *fdp; 1108 void *data; 1109 socklen_t clen = control->m_len, datalen; 1110 int error, oldfds; 1111 u_int newlen; 1112 1113 error = 0; 1114 *controlp = NULL; 1115 1116 while (cm != NULL) { 1117 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1118 || cm->cmsg_len > clen) { 1119 error = EINVAL; 1120 goto out; 1121 } 1122 1123 data = CMSG_DATA(cm); 1124 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1125 1126 switch (cm->cmsg_type) { 1127 /* 1128 * Fill in credential information. 1129 */ 1130 case SCM_CREDS: 1131 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1132 SCM_CREDS, SOL_SOCKET); 1133 if (*controlp == NULL) { 1134 error = ENOBUFS; 1135 goto out; 1136 } 1137 1138 cmcred = (struct cmsgcred *) 1139 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1140 cmcred->cmcred_pid = p->p_pid; 1141 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1142 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1143 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1144 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1145 CMGROUP_MAX); 1146 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1147 cmcred->cmcred_groups[i] = 1148 td->td_ucred->cr_groups[i]; 1149 break; 1150 1151 case SCM_RIGHTS: 1152 oldfds = datalen / sizeof (int); 1153 /* 1154 * check that all the FDs passed in refer to legal files 1155 * If not, reject the entire operation. 1156 */ 1157 fdp = data; 1158 FILEDESC_LOCK(fdescp); 1159 for (i = 0; i < oldfds; i++) { 1160 fd = *fdp++; 1161 if ((unsigned)fd >= fdescp->fd_nfiles || 1162 fdescp->fd_ofiles[fd] == NULL) { 1163 FILEDESC_UNLOCK(fdescp); 1164 error = EBADF; 1165 goto out; 1166 } 1167 } 1168 /* 1169 * Now replace the integer FDs with pointers to 1170 * the associated global file table entry.. 1171 */ 1172 newlen = oldfds * sizeof(struct file *); 1173 *controlp = sbcreatecontrol(NULL, newlen, 1174 SCM_RIGHTS, SOL_SOCKET); 1175 if (*controlp == NULL) { 1176 FILEDESC_UNLOCK(fdescp); 1177 error = E2BIG; 1178 goto out; 1179 } 1180 1181 fdp = data; 1182 rp = (struct file **) 1183 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1184 for (i = 0; i < oldfds; i++) { 1185 fp = fdescp->fd_ofiles[*fdp++]; 1186 *rp++ = fp; 1187 FILE_LOCK(fp); 1188 fp->f_count++; 1189 fp->f_msgcount++; 1190 FILE_UNLOCK(fp); 1191 unp_rights++; 1192 } 1193 FILEDESC_UNLOCK(fdescp); 1194 break; 1195 1196 case SCM_TIMESTAMP: 1197 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 1198 SCM_TIMESTAMP, SOL_SOCKET); 1199 if (*controlp == NULL) { 1200 error = ENOBUFS; 1201 goto out; 1202 } 1203 tv = (struct timeval *) 1204 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1205 microtime(tv); 1206 break; 1207 1208 default: 1209 error = EINVAL; 1210 goto out; 1211 } 1212 1213 controlp = &(*controlp)->m_next; 1214 1215 if (CMSG_SPACE(datalen) < clen) { 1216 clen -= CMSG_SPACE(datalen); 1217 cm = (struct cmsghdr *) 1218 ((caddr_t)cm + CMSG_SPACE(datalen)); 1219 } else { 1220 clen = 0; 1221 cm = NULL; 1222 } 1223 } 1224 1225out: 1226 m_freem(control); 1227 1228 return (error); 1229} 1230 1231static int unp_defer, unp_gcing; 1232 1233static void 1234unp_gc() 1235{ 1236 register struct file *fp, *nextfp; 1237 register struct socket *so; 1238 struct file **extra_ref, **fpp; 1239 int nunref, i; 1240 1241 if (unp_gcing) 1242 return; 1243 unp_gcing = 1; 1244 unp_defer = 0; 1245 /* 1246 * before going through all this, set all FDs to 1247 * be NOT defered and NOT externally accessible 1248 */ 1249 sx_slock(&filelist_lock); 1250 LIST_FOREACH(fp, &filehead, f_list) 1251 fp->f_gcflag &= ~(FMARK|FDEFER); 1252 do { 1253 LIST_FOREACH(fp, &filehead, f_list) { 1254 FILE_LOCK(fp); 1255 /* 1256 * If the file is not open, skip it 1257 */ 1258 if (fp->f_count == 0) { 1259 FILE_UNLOCK(fp); 1260 continue; 1261 } 1262 /* 1263 * If we already marked it as 'defer' in a 1264 * previous pass, then try process it this time 1265 * and un-mark it 1266 */ 1267 if (fp->f_gcflag & FDEFER) { 1268 fp->f_gcflag &= ~FDEFER; 1269 unp_defer--; 1270 } else { 1271 /* 1272 * if it's not defered, then check if it's 1273 * already marked.. if so skip it 1274 */ 1275 if (fp->f_gcflag & FMARK) { 1276 FILE_UNLOCK(fp); 1277 continue; 1278 } 1279 /* 1280 * If all references are from messages 1281 * in transit, then skip it. it's not 1282 * externally accessible. 1283 */ 1284 if (fp->f_count == fp->f_msgcount) { 1285 FILE_UNLOCK(fp); 1286 continue; 1287 } 1288 /* 1289 * If it got this far then it must be 1290 * externally accessible. 1291 */ 1292 fp->f_gcflag |= FMARK; 1293 } 1294 /* 1295 * either it was defered, or it is externally 1296 * accessible and not already marked so. 1297 * Now check if it is possibly one of OUR sockets. 1298 */ 1299 if (fp->f_type != DTYPE_SOCKET || 1300 (so = (struct socket *)fp->f_data) == 0) { 1301 FILE_UNLOCK(fp); 1302 continue; 1303 } 1304 FILE_UNLOCK(fp); 1305 if (so->so_proto->pr_domain != &localdomain || 1306 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 1307 continue; 1308#ifdef notdef 1309 if (so->so_rcv.sb_flags & SB_LOCK) { 1310 /* 1311 * This is problematical; it's not clear 1312 * we need to wait for the sockbuf to be 1313 * unlocked (on a uniprocessor, at least), 1314 * and it's also not clear what to do 1315 * if sbwait returns an error due to receipt 1316 * of a signal. If sbwait does return 1317 * an error, we'll go into an infinite 1318 * loop. Delete all of this for now. 1319 */ 1320 (void) sbwait(&so->so_rcv); 1321 goto restart; 1322 } 1323#endif 1324 /* 1325 * So, Ok, it's one of our sockets and it IS externally 1326 * accessible (or was defered). Now we look 1327 * to see if we hold any file descriptors in its 1328 * message buffers. Follow those links and mark them 1329 * as accessible too. 1330 */ 1331 unp_scan(so->so_rcv.sb_mb, unp_mark); 1332 } 1333 } while (unp_defer); 1334 sx_sunlock(&filelist_lock); 1335 /* 1336 * We grab an extra reference to each of the file table entries 1337 * that are not otherwise accessible and then free the rights 1338 * that are stored in messages on them. 1339 * 1340 * The bug in the orginal code is a little tricky, so I'll describe 1341 * what's wrong with it here. 1342 * 1343 * It is incorrect to simply unp_discard each entry for f_msgcount 1344 * times -- consider the case of sockets A and B that contain 1345 * references to each other. On a last close of some other socket, 1346 * we trigger a gc since the number of outstanding rights (unp_rights) 1347 * is non-zero. If during the sweep phase the gc code un_discards, 1348 * we end up doing a (full) closef on the descriptor. A closef on A 1349 * results in the following chain. Closef calls soo_close, which 1350 * calls soclose. Soclose calls first (through the switch 1351 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1352 * returns because the previous instance had set unp_gcing, and 1353 * we return all the way back to soclose, which marks the socket 1354 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1355 * to free up the rights that are queued in messages on the socket A, 1356 * i.e., the reference on B. The sorflush calls via the dom_dispose 1357 * switch unp_dispose, which unp_scans with unp_discard. This second 1358 * instance of unp_discard just calls closef on B. 1359 * 1360 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1361 * which results in another closef on A. Unfortunately, A is already 1362 * being closed, and the descriptor has already been marked with 1363 * SS_NOFDREF, and soclose panics at this point. 1364 * 1365 * Here, we first take an extra reference to each inaccessible 1366 * descriptor. Then, we call sorflush ourself, since we know 1367 * it is a Unix domain socket anyhow. After we destroy all the 1368 * rights carried in messages, we do a last closef to get rid 1369 * of our extra reference. This is the last close, and the 1370 * unp_detach etc will shut down the socket. 1371 * 1372 * 91/09/19, bsy@cs.cmu.edu 1373 */ 1374 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK); 1375 sx_slock(&filelist_lock); 1376 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0; 1377 fp = nextfp) { 1378 nextfp = LIST_NEXT(fp, f_list); 1379 FILE_LOCK(fp); 1380 /* 1381 * If it's not open, skip it 1382 */ 1383 if (fp->f_count == 0) { 1384 FILE_UNLOCK(fp); 1385 continue; 1386 } 1387 /* 1388 * If all refs are from msgs, and it's not marked accessible 1389 * then it must be referenced from some unreachable cycle 1390 * of (shut-down) FDs, so include it in our 1391 * list of FDs to remove 1392 */ 1393 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) { 1394 *fpp++ = fp; 1395 nunref++; 1396 fp->f_count++; 1397 } 1398 FILE_UNLOCK(fp); 1399 } 1400 sx_sunlock(&filelist_lock); 1401 /* 1402 * for each FD on our hit list, do the following two things 1403 */ 1404 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { 1405 struct file *tfp = *fpp; 1406 FILE_LOCK(tfp); 1407 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) { 1408 FILE_UNLOCK(tfp); 1409 sorflush((struct socket *)(tfp->f_data)); 1410 } else 1411 FILE_UNLOCK(tfp); 1412 } 1413 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) 1414 closef(*fpp, (struct thread *) NULL); 1415 free(extra_ref, M_TEMP); 1416 unp_gcing = 0; 1417} 1418 1419void 1420unp_dispose(m) 1421 struct mbuf *m; 1422{ 1423 1424 if (m) 1425 unp_scan(m, unp_discard); 1426} 1427 1428static int 1429unp_listen(unp, td) 1430 struct unpcb *unp; 1431 struct thread *td; 1432{ 1433 1434 cru2x(td->td_ucred, &unp->unp_peercred); 1435 unp->unp_flags |= UNP_HAVEPCCACHED; 1436 return (0); 1437} 1438 1439static void 1440unp_scan(m0, op) 1441 register struct mbuf *m0; 1442 void (*op)(struct file *); 1443{ 1444 struct mbuf *m; 1445 struct file **rp; 1446 struct cmsghdr *cm; 1447 void *data; 1448 int i; 1449 socklen_t clen, datalen; 1450 int qfds; 1451 1452 while (m0) { 1453 for (m = m0; m; m = m->m_next) { 1454 if (m->m_type != MT_CONTROL) 1455 continue; 1456 1457 cm = mtod(m, struct cmsghdr *); 1458 clen = m->m_len; 1459 1460 while (cm != NULL) { 1461 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 1462 break; 1463 1464 data = CMSG_DATA(cm); 1465 datalen = (caddr_t)cm + cm->cmsg_len 1466 - (caddr_t)data; 1467 1468 if (cm->cmsg_level == SOL_SOCKET && 1469 cm->cmsg_type == SCM_RIGHTS) { 1470 qfds = datalen / sizeof (struct file *); 1471 rp = data; 1472 for (i = 0; i < qfds; i++) 1473 (*op)(*rp++); 1474 } 1475 1476 if (CMSG_SPACE(datalen) < clen) { 1477 clen -= CMSG_SPACE(datalen); 1478 cm = (struct cmsghdr *) 1479 ((caddr_t)cm + CMSG_SPACE(datalen)); 1480 } else { 1481 clen = 0; 1482 cm = NULL; 1483 } 1484 } 1485 } 1486 m0 = m0->m_act; 1487 } 1488} 1489 1490static void 1491unp_mark(fp) 1492 struct file *fp; 1493{ 1494 if (fp->f_gcflag & FMARK) 1495 return; 1496 unp_defer++; 1497 fp->f_gcflag |= (FMARK|FDEFER); 1498} 1499 1500static void 1501unp_discard(fp) 1502 struct file *fp; 1503{ 1504 FILE_LOCK(fp); 1505 fp->f_msgcount--; 1506 unp_rights--; 1507 FILE_UNLOCK(fp); 1508 (void) closef(fp, (struct thread *)NULL); 1509} 1510