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: src/sys/kern/uipc_usrreq.c,v 1.54.2.10 2003/03/04 17:28:09 nectar Exp $ 35 * $DragonFly: src/sys/kern/uipc_usrreq.c,v 1.37 2008/01/06 16:55:51 swildner Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/domain.h> 42 #include <sys/fcntl.h> 43 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 44 #include <sys/proc.h> 45 #include <sys/file.h> 46 #include <sys/filedesc.h> 47 #include <sys/mbuf.h> 48 #include <sys/nlookup.h> 49 #include <sys/protosw.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/resourcevar.h> 53 #include <sys/stat.h> 54 #include <sys/mount.h> 55 #include <sys/sysctl.h> 56 #include <sys/un.h> 57 #include <sys/unpcb.h> 58 #include <sys/vnode.h> 59 #include <sys/file2.h> 60 #include <sys/spinlock2.h> 61 62 #include <vm/vm_zone.h> 63 64 static struct vm_zone *unp_zone; 65 static unp_gen_t unp_gencnt; 66 static u_int unp_count; 67 68 static struct unp_head unp_shead, unp_dhead; 69 70 /* 71 * Unix communications domain. 72 * 73 * TODO: 74 * SEQPACKET, RDM 75 * rethink name space problems 76 * need a proper out-of-band 77 * lock pushdown 78 */ 79 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 80 static ino_t unp_ino; /* prototype for fake inode numbers */ 81 82 static int unp_attach (struct socket *, struct pru_attach_info *); 83 static void unp_detach (struct unpcb *); 84 static int unp_bind (struct unpcb *,struct sockaddr *, struct thread *); 85 static int unp_connect (struct socket *,struct sockaddr *, 86 struct thread *); 87 static void unp_disconnect (struct unpcb *); 88 static void unp_shutdown (struct unpcb *); 89 static void unp_drop (struct unpcb *, int); 90 static void unp_gc (void); 91 static int unp_gc_clearmarks(struct file *, void *); 92 static int unp_gc_checkmarks(struct file *, void *); 93 static int unp_gc_checkrefs(struct file *, void *); 94 static void unp_scan (struct mbuf *, void (*)(struct file *, void *), 95 void *data); 96 static void unp_mark (struct file *, void *data); 97 static void unp_discard (struct file *, void *); 98 static int unp_internalize (struct mbuf *, struct thread *); 99 static int unp_listen (struct unpcb *, struct thread *); 100 101 static int 102 uipc_abort(struct socket *so) 103 { 104 struct unpcb *unp = so->so_pcb; 105 106 if (unp == NULL) 107 return EINVAL; 108 unp_drop(unp, ECONNABORTED); 109 unp_detach(unp); 110 sofree(so); 111 return 0; 112 } 113 114 static int 115 uipc_accept(struct socket *so, struct sockaddr **nam) 116 { 117 struct unpcb *unp = so->so_pcb; 118 119 if (unp == NULL) 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 } else { 130 *nam = dup_sockaddr((struct sockaddr *)&sun_noname); 131 } 132 return 0; 133 } 134 135 static int 136 uipc_attach(struct socket *so, int proto, struct pru_attach_info *ai) 137 { 138 struct unpcb *unp = so->so_pcb; 139 140 if (unp != NULL) 141 return EISCONN; 142 return unp_attach(so, ai); 143 } 144 145 static int 146 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 147 { 148 struct unpcb *unp = so->so_pcb; 149 150 if (unp == NULL) 151 return EINVAL; 152 return unp_bind(unp, nam, td); 153 } 154 155 static int 156 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 157 { 158 struct unpcb *unp = so->so_pcb; 159 160 if (unp == NULL) 161 return EINVAL; 162 return unp_connect(so, nam, td); 163 } 164 165 static int 166 uipc_connect2(struct socket *so1, struct socket *so2) 167 { 168 struct unpcb *unp = so1->so_pcb; 169 170 if (unp == NULL) 171 return EINVAL; 172 173 return unp_connect2(so1, so2); 174 } 175 176 /* control is EOPNOTSUPP */ 177 178 static int 179 uipc_detach(struct socket *so) 180 { 181 struct unpcb *unp = so->so_pcb; 182 183 if (unp == NULL) 184 return EINVAL; 185 186 unp_detach(unp); 187 return 0; 188 } 189 190 static int 191 uipc_disconnect(struct socket *so) 192 { 193 struct unpcb *unp = so->so_pcb; 194 195 if (unp == NULL) 196 return EINVAL; 197 unp_disconnect(unp); 198 return 0; 199 } 200 201 static int 202 uipc_listen(struct socket *so, struct thread *td) 203 { 204 struct unpcb *unp = so->so_pcb; 205 206 if (unp == NULL || unp->unp_vnode == NULL) 207 return EINVAL; 208 return unp_listen(unp, td); 209 } 210 211 static int 212 uipc_peeraddr(struct socket *so, struct sockaddr **nam) 213 { 214 struct unpcb *unp = so->so_pcb; 215 216 if (unp == NULL) 217 return EINVAL; 218 if (unp->unp_conn && unp->unp_conn->unp_addr) 219 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr); 220 else { 221 /* 222 * XXX: It seems that this test always fails even when 223 * connection is established. So, this else clause is 224 * added as workaround to return PF_LOCAL sockaddr. 225 */ 226 *nam = dup_sockaddr((struct sockaddr *)&sun_noname); 227 } 228 return 0; 229 } 230 231 static int 232 uipc_rcvd(struct socket *so, int flags) 233 { 234 struct unpcb *unp = so->so_pcb; 235 struct socket *so2; 236 u_long newhiwat; 237 238 if (unp == NULL) 239 return EINVAL; 240 switch (so->so_type) { 241 case SOCK_DGRAM: 242 panic("uipc_rcvd DGRAM?"); 243 /*NOTREACHED*/ 244 245 case SOCK_STREAM: 246 if (unp->unp_conn == NULL) 247 break; 248 so2 = unp->unp_conn->unp_socket; 249 /* 250 * Adjust backpressure on sender 251 * and wakeup any waiting to write. 252 */ 253 so2->so_snd.ssb_mbmax += unp->unp_mbcnt - so->so_rcv.ssb_mbcnt; 254 unp->unp_mbcnt = so->so_rcv.ssb_mbcnt; 255 newhiwat = 256 so2->so_snd.ssb_hiwat + unp->unp_cc - so->so_rcv.ssb_cc; 257 chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.ssb_hiwat, 258 newhiwat, RLIM_INFINITY); 259 unp->unp_cc = so->so_rcv.ssb_cc; 260 sowwakeup(so2); 261 break; 262 263 default: 264 panic("uipc_rcvd unknown socktype"); 265 } 266 return 0; 267 } 268 269 /* pru_rcvoob is EOPNOTSUPP */ 270 271 static int 272 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 273 struct mbuf *control, struct thread *td) 274 { 275 int error = 0; 276 struct unpcb *unp = so->so_pcb; 277 struct socket *so2; 278 u_long newhiwat; 279 280 if (unp == NULL) { 281 error = EINVAL; 282 goto release; 283 } 284 if (flags & PRUS_OOB) { 285 error = EOPNOTSUPP; 286 goto release; 287 } 288 289 if (control && (error = unp_internalize(control, td))) 290 goto release; 291 292 switch (so->so_type) { 293 case SOCK_DGRAM: 294 { 295 struct sockaddr *from; 296 297 if (nam) { 298 if (unp->unp_conn) { 299 error = EISCONN; 300 break; 301 } 302 error = unp_connect(so, nam, td); 303 if (error) 304 break; 305 } else { 306 if (unp->unp_conn == NULL) { 307 error = ENOTCONN; 308 break; 309 } 310 } 311 so2 = unp->unp_conn->unp_socket; 312 if (unp->unp_addr) 313 from = (struct sockaddr *)unp->unp_addr; 314 else 315 from = &sun_noname; 316 if (ssb_appendaddr(&so2->so_rcv, from, m, control)) { 317 sorwakeup(so2); 318 m = NULL; 319 control = NULL; 320 } else { 321 error = ENOBUFS; 322 } 323 if (nam) 324 unp_disconnect(unp); 325 break; 326 } 327 328 case SOCK_STREAM: 329 /* Connect if not connected yet. */ 330 /* 331 * Note: A better implementation would complain 332 * if not equal to the peer's address. 333 */ 334 if (!(so->so_state & SS_ISCONNECTED)) { 335 if (nam) { 336 error = unp_connect(so, nam, td); 337 if (error) 338 break; /* XXX */ 339 } else { 340 error = ENOTCONN; 341 break; 342 } 343 } 344 345 if (so->so_state & SS_CANTSENDMORE) { 346 error = EPIPE; 347 break; 348 } 349 if (unp->unp_conn == NULL) 350 panic("uipc_send connected but no connection?"); 351 so2 = unp->unp_conn->unp_socket; 352 /* 353 * Send to paired receive port, and then reduce 354 * send buffer hiwater marks to maintain backpressure. 355 * Wake up readers. 356 */ 357 if (control) { 358 if (ssb_appendcontrol(&so2->so_rcv, m, control)) { 359 control = NULL; 360 m = NULL; 361 } 362 } else { 363 sbappend(&so2->so_rcv.sb, m); 364 m = NULL; 365 } 366 so->so_snd.ssb_mbmax -= 367 so2->so_rcv.ssb_mbcnt - unp->unp_conn->unp_mbcnt; 368 unp->unp_conn->unp_mbcnt = so2->so_rcv.ssb_mbcnt; 369 newhiwat = so->so_snd.ssb_hiwat - 370 (so2->so_rcv.ssb_cc - unp->unp_conn->unp_cc); 371 chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.ssb_hiwat, 372 newhiwat, RLIM_INFINITY); 373 unp->unp_conn->unp_cc = so2->so_rcv.ssb_cc; 374 sorwakeup(so2); 375 break; 376 377 default: 378 panic("uipc_send unknown socktype"); 379 } 380 381 /* 382 * SEND_EOF is equivalent to a SEND followed by 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); 391 392 release: 393 if (control) 394 m_freem(control); 395 if (m) 396 m_freem(m); 397 return error; 398 } 399 400 static int 401 uipc_sense(struct socket *so, struct stat *sb) 402 { 403 struct unpcb *unp = so->so_pcb; 404 struct socket *so2; 405 406 if (unp == NULL) 407 return EINVAL; 408 sb->st_blksize = so->so_snd.ssb_hiwat; 409 if (so->so_type == SOCK_STREAM && unp->unp_conn != NULL) { 410 so2 = unp->unp_conn->unp_socket; 411 sb->st_blksize += so2->so_rcv.ssb_cc; 412 } 413 sb->st_dev = NOUDEV; 414 if (unp->unp_ino == 0) /* make up a non-zero inode number */ 415 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 416 sb->st_ino = unp->unp_ino; 417 return (0); 418 } 419 420 static int 421 uipc_shutdown(struct socket *so) 422 { 423 struct unpcb *unp = so->so_pcb; 424 425 if (unp == NULL) 426 return EINVAL; 427 socantsendmore(so); 428 unp_shutdown(unp); 429 return 0; 430 } 431 432 static int 433 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 434 { 435 struct unpcb *unp = so->so_pcb; 436 437 if (unp == NULL) 438 return EINVAL; 439 if (unp->unp_addr) 440 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr); 441 return 0; 442 } 443 444 struct pr_usrreqs uipc_usrreqs = { 445 .pru_abort = uipc_abort, 446 .pru_accept = uipc_accept, 447 .pru_attach = uipc_attach, 448 .pru_bind = uipc_bind, 449 .pru_connect = uipc_connect, 450 .pru_connect2 = uipc_connect2, 451 .pru_control = pru_control_notsupp, 452 .pru_detach = uipc_detach, 453 .pru_disconnect = uipc_disconnect, 454 .pru_listen = uipc_listen, 455 .pru_peeraddr = uipc_peeraddr, 456 .pru_rcvd = uipc_rcvd, 457 .pru_rcvoob = pru_rcvoob_notsupp, 458 .pru_send = uipc_send, 459 .pru_sense = uipc_sense, 460 .pru_shutdown = uipc_shutdown, 461 .pru_sockaddr = uipc_sockaddr, 462 .pru_sosend = sosend, 463 .pru_soreceive = soreceive, 464 .pru_sopoll = sopoll 465 }; 466 467 int 468 uipc_ctloutput(struct socket *so, struct sockopt *sopt) 469 { 470 struct unpcb *unp = so->so_pcb; 471 int error; 472 473 switch (sopt->sopt_dir) { 474 case SOPT_GET: 475 switch (sopt->sopt_name) { 476 case LOCAL_PEERCRED: 477 if (unp->unp_flags & UNP_HAVEPC) 478 error = sooptcopyout(sopt, &unp->unp_peercred, 479 sizeof(unp->unp_peercred)); 480 else { 481 if (so->so_type == SOCK_STREAM) 482 error = ENOTCONN; 483 else 484 error = EINVAL; 485 } 486 break; 487 default: 488 error = EOPNOTSUPP; 489 break; 490 } 491 break; 492 case SOPT_SET: 493 default: 494 error = EOPNOTSUPP; 495 break; 496 } 497 return (error); 498 } 499 500 /* 501 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 502 * for stream sockets, although the total for sender and receiver is 503 * actually only PIPSIZ. 504 * Datagram sockets really use the sendspace as the maximum datagram size, 505 * and don't really want to reserve the sendspace. Their recvspace should 506 * be large enough for at least one max-size datagram plus address. 507 */ 508 #ifndef PIPSIZ 509 #define PIPSIZ 8192 510 #endif 511 static u_long unpst_sendspace = PIPSIZ; 512 static u_long unpst_recvspace = PIPSIZ; 513 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 514 static u_long unpdg_recvspace = 4*1024; 515 516 static int unp_rights; /* file descriptors in flight */ 517 static struct spinlock unp_spin = SPINLOCK_INITIALIZER(&unp_spin); 518 519 SYSCTL_DECL(_net_local_stream); 520 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 521 &unpst_sendspace, 0, ""); 522 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 523 &unpst_recvspace, 0, ""); 524 525 SYSCTL_DECL(_net_local_dgram); 526 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 527 &unpdg_sendspace, 0, ""); 528 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 529 &unpdg_recvspace, 0, ""); 530 531 SYSCTL_DECL(_net_local); 532 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 533 534 static int 535 unp_attach(struct socket *so, struct pru_attach_info *ai) 536 { 537 struct unpcb *unp; 538 int error; 539 540 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 541 switch (so->so_type) { 542 543 case SOCK_STREAM: 544 error = soreserve(so, unpst_sendspace, unpst_recvspace, 545 ai->sb_rlimit); 546 break; 547 548 case SOCK_DGRAM: 549 error = soreserve(so, unpdg_sendspace, unpdg_recvspace, 550 ai->sb_rlimit); 551 break; 552 553 default: 554 panic("unp_attach"); 555 } 556 if (error) 557 return (error); 558 } 559 unp = zalloc(unp_zone); 560 if (unp == NULL) 561 return (ENOBUFS); 562 bzero(unp, sizeof *unp); 563 unp->unp_gencnt = ++unp_gencnt; 564 unp_count++; 565 LIST_INIT(&unp->unp_refs); 566 unp->unp_socket = so; 567 unp->unp_rvnode = ai->fd_rdir; /* jail cruft XXX JH */ 568 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 569 : &unp_shead, unp, unp_link); 570 so->so_pcb = (caddr_t)unp; 571 return (0); 572 } 573 574 static void 575 unp_detach(struct unpcb *unp) 576 { 577 LIST_REMOVE(unp, unp_link); 578 unp->unp_gencnt = ++unp_gencnt; 579 --unp_count; 580 if (unp->unp_vnode) { 581 unp->unp_vnode->v_socket = NULL; 582 vrele(unp->unp_vnode); 583 unp->unp_vnode = NULL; 584 } 585 if (unp->unp_conn) 586 unp_disconnect(unp); 587 while (!LIST_EMPTY(&unp->unp_refs)) 588 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 589 soisdisconnected(unp->unp_socket); 590 unp->unp_socket->so_pcb = NULL; 591 if (unp_rights) { 592 /* 593 * Normally the receive buffer is flushed later, 594 * in sofree, but if our receive buffer holds references 595 * to descriptors that are now garbage, we will dispose 596 * of those descriptor references after the garbage collector 597 * gets them (resulting in a "panic: closef: count < 0"). 598 */ 599 sorflush(unp->unp_socket); 600 unp_gc(); 601 } 602 if (unp->unp_addr) 603 kfree(unp->unp_addr, M_SONAME); 604 zfree(unp_zone, unp); 605 } 606 607 static int 608 unp_bind(struct unpcb *unp, struct sockaddr *nam, struct thread *td) 609 { 610 struct proc *p = td->td_proc; 611 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 612 struct vnode *dvp; 613 struct vnode *vp; 614 struct vattr vattr; 615 int error, namelen; 616 struct nlookupdata nd; 617 char buf[SOCK_MAXADDRLEN]; 618 619 if (unp->unp_vnode != NULL) 620 return (EINVAL); 621 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 622 if (namelen <= 0) 623 return (EINVAL); 624 strncpy(buf, soun->sun_path, namelen); 625 buf[namelen] = 0; /* null-terminate the string */ 626 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_LOCKVP|NLC_CREATE); 627 if (error == 0) 628 error = nlookup(&nd); 629 if (error == 0 && nd.nl_nch.ncp->nc_vp != NULL) 630 error = EADDRINUSE; 631 if (error == 0 && (dvp = nd.nl_nch.ncp->nc_parent->nc_vp) == NULL) 632 error = EPERM; 633 if (error) 634 goto done; 635 636 /* vhold(dvp); - DVP can't go away */ 637 VATTR_NULL(&vattr); 638 vattr.va_type = VSOCK; 639 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask); 640 error = VOP_NCREATE(&nd.nl_nch, dvp, &vp, nd.nl_cred, &vattr); 641 /* vdrop(dvp); */ 642 if (error == 0) { 643 vp->v_socket = unp->unp_socket; 644 unp->unp_vnode = vp; 645 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam); 646 vn_unlock(vp); 647 } 648 done: 649 nlookup_done(&nd); 650 return (error); 651 } 652 653 static int 654 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 655 { 656 struct proc *p = td->td_proc; 657 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 658 struct vnode *vp; 659 struct socket *so2, *so3; 660 struct unpcb *unp, *unp2, *unp3; 661 int error, len; 662 struct nlookupdata nd; 663 char buf[SOCK_MAXADDRLEN]; 664 665 KKASSERT(p); 666 667 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 668 if (len <= 0) 669 return EINVAL; 670 strncpy(buf, soun->sun_path, len); 671 buf[len] = 0; 672 673 vp = NULL; 674 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW); 675 if (error == 0) 676 error = nlookup(&nd); 677 if (error == 0) 678 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 679 nlookup_done(&nd); 680 if (error) 681 return (error); 682 683 if (vp->v_type != VSOCK) { 684 error = ENOTSOCK; 685 goto bad; 686 } 687 error = VOP_ACCESS(vp, VWRITE, p->p_ucred); 688 if (error) 689 goto bad; 690 so2 = vp->v_socket; 691 if (so2 == NULL) { 692 error = ECONNREFUSED; 693 goto bad; 694 } 695 if (so->so_type != so2->so_type) { 696 error = EPROTOTYPE; 697 goto bad; 698 } 699 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 700 if (!(so2->so_options & SO_ACCEPTCONN) || 701 (so3 = sonewconn(so2, 0)) == NULL) { 702 error = ECONNREFUSED; 703 goto bad; 704 } 705 unp = so->so_pcb; 706 unp2 = so2->so_pcb; 707 unp3 = so3->so_pcb; 708 if (unp2->unp_addr) 709 unp3->unp_addr = (struct sockaddr_un *) 710 dup_sockaddr((struct sockaddr *)unp2->unp_addr); 711 712 /* 713 * unp_peercred management: 714 * 715 * The connecter's (client's) credentials are copied 716 * from its process structure at the time of connect() 717 * (which is now). 718 */ 719 cru2x(p->p_ucred, &unp3->unp_peercred); 720 unp3->unp_flags |= UNP_HAVEPC; 721 /* 722 * The receiver's (server's) credentials are copied 723 * from the unp_peercred member of socket on which the 724 * former called listen(); unp_listen() cached that 725 * process's credentials at that time so we can use 726 * them now. 727 */ 728 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 729 ("unp_connect: listener without cached peercred")); 730 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 731 sizeof(unp->unp_peercred)); 732 unp->unp_flags |= UNP_HAVEPC; 733 734 so2 = so3; 735 } 736 error = unp_connect2(so, so2); 737 bad: 738 vput(vp); 739 return (error); 740 } 741 742 int 743 unp_connect2(struct socket *so, struct socket *so2) 744 { 745 struct unpcb *unp = so->so_pcb; 746 struct unpcb *unp2; 747 748 if (so2->so_type != so->so_type) 749 return (EPROTOTYPE); 750 unp2 = so2->so_pcb; 751 unp->unp_conn = unp2; 752 switch (so->so_type) { 753 754 case SOCK_DGRAM: 755 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 756 soisconnected(so); 757 break; 758 759 case SOCK_STREAM: 760 unp2->unp_conn = unp; 761 soisconnected(so); 762 soisconnected(so2); 763 break; 764 765 default: 766 panic("unp_connect2"); 767 } 768 return (0); 769 } 770 771 static void 772 unp_disconnect(struct unpcb *unp) 773 { 774 struct unpcb *unp2 = unp->unp_conn; 775 776 if (unp2 == NULL) 777 return; 778 779 unp->unp_conn = NULL; 780 781 switch (unp->unp_socket->so_type) { 782 case SOCK_DGRAM: 783 LIST_REMOVE(unp, unp_reflink); 784 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 785 break; 786 case SOCK_STREAM: 787 soisdisconnected(unp->unp_socket); 788 unp2->unp_conn = NULL; 789 soisdisconnected(unp2->unp_socket); 790 break; 791 } 792 } 793 794 #ifdef notdef 795 void 796 unp_abort(struct unpcb *unp) 797 { 798 799 unp_detach(unp); 800 } 801 #endif 802 803 static int 804 prison_unpcb(struct thread *td, struct unpcb *unp) 805 { 806 struct proc *p; 807 808 if (td == NULL) 809 return (0); 810 if ((p = td->td_proc) == NULL) 811 return (0); 812 if (!p->p_ucred->cr_prison) 813 return (0); 814 if (p->p_fd->fd_rdir == unp->unp_rvnode) 815 return (0); 816 return (1); 817 } 818 819 static int 820 unp_pcblist(SYSCTL_HANDLER_ARGS) 821 { 822 int error, i, n; 823 struct unpcb *unp, **unp_list; 824 unp_gen_t gencnt; 825 struct unp_head *head; 826 827 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 828 829 KKASSERT(curproc != NULL); 830 831 /* 832 * The process of preparing the PCB list is too time-consuming and 833 * resource-intensive to repeat twice on every request. 834 */ 835 if (req->oldptr == NULL) { 836 n = unp_count; 837 req->oldidx = (n + n/8) * sizeof(struct xunpcb); 838 return 0; 839 } 840 841 if (req->newptr != NULL) 842 return EPERM; 843 844 /* 845 * OK, now we're committed to doing something. 846 */ 847 gencnt = unp_gencnt; 848 n = unp_count; 849 850 unp_list = kmalloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 851 852 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 853 unp = LIST_NEXT(unp, unp_link)) { 854 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->td, unp)) 855 unp_list[i++] = unp; 856 } 857 n = i; /* in case we lost some during malloc */ 858 859 error = 0; 860 for (i = 0; i < n; i++) { 861 unp = unp_list[i]; 862 if (unp->unp_gencnt <= gencnt) { 863 struct xunpcb xu; 864 xu.xu_len = sizeof xu; 865 xu.xu_unpp = unp; 866 /* 867 * XXX - need more locking here to protect against 868 * connect/disconnect races for SMP. 869 */ 870 if (unp->unp_addr) 871 bcopy(unp->unp_addr, &xu.xu_addr, 872 unp->unp_addr->sun_len); 873 if (unp->unp_conn && unp->unp_conn->unp_addr) 874 bcopy(unp->unp_conn->unp_addr, 875 &xu.xu_caddr, 876 unp->unp_conn->unp_addr->sun_len); 877 bcopy(unp, &xu.xu_unp, sizeof *unp); 878 sotoxsocket(unp->unp_socket, &xu.xu_socket); 879 error = SYSCTL_OUT(req, &xu, sizeof xu); 880 } 881 } 882 kfree(unp_list, M_TEMP); 883 return error; 884 } 885 886 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 887 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 888 "List of active local datagram sockets"); 889 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 890 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 891 "List of active local stream sockets"); 892 893 static void 894 unp_shutdown(struct unpcb *unp) 895 { 896 struct socket *so; 897 898 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn != NULL && 899 (so = unp->unp_conn->unp_socket)) 900 socantrcvmore(so); 901 } 902 903 static void 904 unp_drop(struct unpcb *unp, int err) 905 { 906 struct socket *so = unp->unp_socket; 907 908 so->so_error = err; 909 unp_disconnect(unp); 910 } 911 912 #ifdef notdef 913 void 914 unp_drain(void) 915 { 916 917 } 918 #endif 919 920 int 921 unp_externalize(struct mbuf *rights) 922 { 923 struct proc *p = curproc; /* XXX */ 924 int i; 925 struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 926 int *fdp; 927 struct file **rp; 928 struct file *fp; 929 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm)) 930 / sizeof (struct file *); 931 int f; 932 933 /* 934 * if the new FD's will not fit, then we free them all 935 */ 936 if (!fdavail(p, newfds)) { 937 rp = (struct file **)CMSG_DATA(cm); 938 for (i = 0; i < newfds; i++) { 939 fp = *rp; 940 /* 941 * zero the pointer before calling unp_discard, 942 * since it may end up in unp_gc().. 943 */ 944 *rp++ = 0; 945 unp_discard(fp, NULL); 946 } 947 return (EMSGSIZE); 948 } 949 /* 950 * now change each pointer to an fd in the global table to 951 * an integer that is the index to the local fd table entry 952 * that we set up to point to the global one we are transferring. 953 * If sizeof (struct file *) is bigger than or equal to sizeof int, 954 * then do it in forward order. In that case, an integer will 955 * always come in the same place or before its corresponding 956 * struct file pointer. 957 * If sizeof (struct file *) is smaller than sizeof int, then 958 * do it in reverse order. 959 */ 960 if (sizeof (struct file *) >= sizeof (int)) { 961 fdp = (int *)(cm + 1); 962 rp = (struct file **)CMSG_DATA(cm); 963 for (i = 0; i < newfds; i++) { 964 if (fdalloc(p, 0, &f)) 965 panic("unp_externalize"); 966 fp = *rp++; 967 fsetfd(p, fp, f); 968 fdrop(fp); 969 spin_lock_wr(&unp_spin); 970 fp->f_msgcount--; 971 unp_rights--; 972 spin_unlock_wr(&unp_spin); 973 *fdp++ = f; 974 } 975 } else { 976 fdp = (int *)(cm + 1) + newfds - 1; 977 rp = (struct file **)CMSG_DATA(cm) + newfds - 1; 978 for (i = 0; i < newfds; i++) { 979 if (fdalloc(p, 0, &f)) 980 panic("unp_externalize"); 981 fp = *rp--; 982 fsetfd(p, fp, f); 983 fdrop(fp); 984 spin_lock_wr(&unp_spin); 985 fp->f_msgcount--; 986 unp_rights--; 987 spin_unlock_wr(&unp_spin); 988 *fdp-- = f; 989 } 990 } 991 992 /* 993 * Adjust length, in case sizeof(struct file *) and sizeof(int) 994 * differs. 995 */ 996 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int)); 997 rights->m_len = cm->cmsg_len; 998 return (0); 999 } 1000 1001 void 1002 unp_init(void) 1003 { 1004 unp_zone = zinit("unpcb", sizeof(struct unpcb), nmbclusters, 0, 0); 1005 if (unp_zone == NULL) 1006 panic("unp_init"); 1007 LIST_INIT(&unp_dhead); 1008 LIST_INIT(&unp_shead); 1009 spin_init(&unp_spin); 1010 } 1011 1012 static int 1013 unp_internalize(struct mbuf *control, struct thread *td) 1014 { 1015 struct proc *p = td->td_proc; 1016 struct filedesc *fdescp; 1017 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1018 struct file **rp; 1019 struct file *fp; 1020 int i, fd, *fdp; 1021 struct cmsgcred *cmcred; 1022 int oldfds; 1023 u_int newlen; 1024 1025 KKASSERT(p); 1026 fdescp = p->p_fd; 1027 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) || 1028 cm->cmsg_level != SOL_SOCKET || cm->cmsg_len != control->m_len) 1029 return (EINVAL); 1030 1031 /* 1032 * Fill in credential information. 1033 */ 1034 if (cm->cmsg_type == SCM_CREDS) { 1035 cmcred = (struct cmsgcred *)(cm + 1); 1036 cmcred->cmcred_pid = p->p_pid; 1037 cmcred->cmcred_uid = p->p_ucred->cr_ruid; 1038 cmcred->cmcred_gid = p->p_ucred->cr_rgid; 1039 cmcred->cmcred_euid = p->p_ucred->cr_uid; 1040 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups, 1041 CMGROUP_MAX); 1042 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1043 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i]; 1044 return(0); 1045 } 1046 1047 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int); 1048 /* 1049 * check that all the FDs passed in refer to legal OPEN files 1050 * If not, reject the entire operation. 1051 */ 1052 fdp = (int *)(cm + 1); 1053 for (i = 0; i < oldfds; i++) { 1054 fd = *fdp++; 1055 if ((unsigned)fd >= fdescp->fd_nfiles || 1056 fdescp->fd_files[fd].fp == NULL) 1057 return (EBADF); 1058 if (fdescp->fd_files[fd].fp->f_type == DTYPE_KQUEUE) 1059 return (EOPNOTSUPP); 1060 } 1061 /* 1062 * Now replace the integer FDs with pointers to 1063 * the associated global file table entry.. 1064 * Allocate a bigger buffer as necessary. But if an cluster is not 1065 * enough, return E2BIG. 1066 */ 1067 newlen = CMSG_LEN(oldfds * sizeof(struct file *)); 1068 if (newlen > MCLBYTES) 1069 return (E2BIG); 1070 if (newlen - control->m_len > M_TRAILINGSPACE(control)) { 1071 if (control->m_flags & M_EXT) 1072 return (E2BIG); 1073 MCLGET(control, MB_WAIT); 1074 if (!(control->m_flags & M_EXT)) 1075 return (ENOBUFS); 1076 1077 /* copy the data to the cluster */ 1078 memcpy(mtod(control, char *), cm, cm->cmsg_len); 1079 cm = mtod(control, struct cmsghdr *); 1080 } 1081 1082 /* 1083 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1084 * differs. 1085 */ 1086 control->m_len = cm->cmsg_len = newlen; 1087 1088 /* 1089 * Transform the file descriptors into struct file pointers. 1090 * If sizeof (struct file *) is bigger than or equal to sizeof int, 1091 * then do it in reverse order so that the int won't get until 1092 * we're done. 1093 * If sizeof (struct file *) is smaller than sizeof int, then 1094 * do it in forward order. 1095 */ 1096 if (sizeof (struct file *) >= sizeof (int)) { 1097 fdp = (int *)(cm + 1) + oldfds - 1; 1098 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1; 1099 for (i = 0; i < oldfds; i++) { 1100 fp = fdescp->fd_files[*fdp--].fp; 1101 *rp-- = fp; 1102 fhold(fp); 1103 spin_lock_wr(&unp_spin); 1104 fp->f_msgcount++; 1105 unp_rights++; 1106 spin_unlock_wr(&unp_spin); 1107 } 1108 } else { 1109 fdp = (int *)(cm + 1); 1110 rp = (struct file **)CMSG_DATA(cm); 1111 for (i = 0; i < oldfds; i++) { 1112 fp = fdescp->fd_files[*fdp++].fp; 1113 *rp++ = fp; 1114 fhold(fp); 1115 spin_lock_wr(&unp_spin); 1116 fp->f_msgcount++; 1117 unp_rights++; 1118 spin_unlock_wr(&unp_spin); 1119 } 1120 } 1121 return (0); 1122 } 1123 1124 /* 1125 * Garbage collect in-transit file descriptors that get lost due to 1126 * loops (i.e. when a socket is sent to another process over itself, 1127 * and more complex situations). 1128 * 1129 * NOT MPSAFE - TODO socket flush code and maybe closef. Rest is MPSAFE. 1130 */ 1131 1132 struct unp_gc_info { 1133 struct file **extra_ref; 1134 struct file *locked_fp; 1135 int defer; 1136 int index; 1137 int maxindex; 1138 }; 1139 1140 static void 1141 unp_gc(void) 1142 { 1143 struct unp_gc_info info; 1144 static boolean_t unp_gcing; 1145 struct file **fpp; 1146 int i; 1147 1148 spin_lock_wr(&unp_spin); 1149 if (unp_gcing) { 1150 spin_unlock_wr(&unp_spin); 1151 return; 1152 } 1153 unp_gcing = TRUE; 1154 spin_unlock_wr(&unp_spin); 1155 1156 /* 1157 * before going through all this, set all FDs to 1158 * be NOT defered and NOT externally accessible 1159 */ 1160 info.defer = 0; 1161 allfiles_scan_exclusive(unp_gc_clearmarks, NULL); 1162 do { 1163 allfiles_scan_exclusive(unp_gc_checkmarks, &info); 1164 } while (info.defer); 1165 1166 /* 1167 * We grab an extra reference to each of the file table entries 1168 * that are not otherwise accessible and then free the rights 1169 * that are stored in messages on them. 1170 * 1171 * The bug in the orginal code is a little tricky, so I'll describe 1172 * what's wrong with it here. 1173 * 1174 * It is incorrect to simply unp_discard each entry for f_msgcount 1175 * times -- consider the case of sockets A and B that contain 1176 * references to each other. On a last close of some other socket, 1177 * we trigger a gc since the number of outstanding rights (unp_rights) 1178 * is non-zero. If during the sweep phase the gc code un_discards, 1179 * we end up doing a (full) closef on the descriptor. A closef on A 1180 * results in the following chain. Closef calls soo_close, which 1181 * calls soclose. Soclose calls first (through the switch 1182 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1183 * returns because the previous instance had set unp_gcing, and 1184 * we return all the way back to soclose, which marks the socket 1185 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1186 * to free up the rights that are queued in messages on the socket A, 1187 * i.e., the reference on B. The sorflush calls via the dom_dispose 1188 * switch unp_dispose, which unp_scans with unp_discard. This second 1189 * instance of unp_discard just calls closef on B. 1190 * 1191 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1192 * which results in another closef on A. Unfortunately, A is already 1193 * being closed, and the descriptor has already been marked with 1194 * SS_NOFDREF, and soclose panics at this point. 1195 * 1196 * Here, we first take an extra reference to each inaccessible 1197 * descriptor. Then, we call sorflush ourself, since we know 1198 * it is a Unix domain socket anyhow. After we destroy all the 1199 * rights carried in messages, we do a last closef to get rid 1200 * of our extra reference. This is the last close, and the 1201 * unp_detach etc will shut down the socket. 1202 * 1203 * 91/09/19, bsy@cs.cmu.edu 1204 */ 1205 info.extra_ref = kmalloc(256 * sizeof(struct file *), M_FILE, M_WAITOK); 1206 info.maxindex = 256; 1207 1208 do { 1209 /* 1210 * Look for matches 1211 */ 1212 info.index = 0; 1213 allfiles_scan_exclusive(unp_gc_checkrefs, &info); 1214 1215 /* 1216 * For each FD on our hit list, do the following two things 1217 */ 1218 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) { 1219 struct file *tfp = *fpp; 1220 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) 1221 sorflush((struct socket *)(tfp->f_data)); 1222 } 1223 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) 1224 closef(*fpp, NULL); 1225 } while (info.index == info.maxindex); 1226 kfree((caddr_t)info.extra_ref, M_FILE); 1227 unp_gcing = FALSE; 1228 } 1229 1230 /* 1231 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1232 */ 1233 static int 1234 unp_gc_checkrefs(struct file *fp, void *data) 1235 { 1236 struct unp_gc_info *info = data; 1237 1238 if (fp->f_count == 0) 1239 return(0); 1240 if (info->index == info->maxindex) 1241 return(-1); 1242 1243 /* 1244 * If all refs are from msgs, and it's not marked accessible 1245 * then it must be referenced from some unreachable cycle 1246 * of (shut-down) FDs, so include it in our 1247 * list of FDs to remove 1248 */ 1249 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) { 1250 info->extra_ref[info->index++] = fp; 1251 fhold(fp); 1252 } 1253 return(0); 1254 } 1255 1256 /* 1257 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1258 */ 1259 static int 1260 unp_gc_clearmarks(struct file *fp, void *data __unused) 1261 { 1262 fp->f_flag &= ~(FMARK|FDEFER); 1263 return(0); 1264 } 1265 1266 /* 1267 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1268 */ 1269 static int 1270 unp_gc_checkmarks(struct file *fp, void *data) 1271 { 1272 struct unp_gc_info *info = data; 1273 struct socket *so; 1274 1275 /* 1276 * If the file is not open, skip it 1277 */ 1278 if (fp->f_count == 0) 1279 return(0); 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_flag & FDEFER) { 1286 fp->f_flag &= ~FDEFER; 1287 --info->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_flag & FMARK) 1294 return(0); 1295 /* 1296 * If all references are from messages 1297 * in transit, then skip it. it's not 1298 * externally accessible. 1299 */ 1300 if (fp->f_count == fp->f_msgcount) 1301 return(0); 1302 /* 1303 * If it got this far then it must be 1304 * externally accessible. 1305 */ 1306 fp->f_flag |= 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 = (struct socket *)fp->f_data) == NULL) 1315 return(0); 1316 if (so->so_proto->pr_domain != &localdomain || 1317 !(so->so_proto->pr_flags & PR_RIGHTS)) 1318 return(0); 1319 #ifdef notdef 1320 XXX note: exclusive fp->f_spin lock held 1321 if (so->so_rcv.sb_flags & SB_LOCK) { 1322 /* 1323 * This is problematical; it's not clear 1324 * we need to wait for the sockbuf to be 1325 * unlocked (on a uniprocessor, at least), 1326 * and it's also not clear what to do 1327 * if sbwait returns an error due to receipt 1328 * of a signal. If sbwait does return 1329 * an error, we'll go into an infinite 1330 * loop. Delete all of this for now. 1331 */ 1332 sbwait(&so->so_rcv); 1333 goto restart; 1334 } 1335 #endif 1336 /* 1337 * So, Ok, it's one of our sockets and it IS externally 1338 * accessible (or was defered). Now we look 1339 * to see if we hold any file descriptors in its 1340 * message buffers. Follow those links and mark them 1341 * as accessible too. 1342 */ 1343 info->locked_fp = fp; 1344 /* spin_lock_wr(&so->so_rcv.sb_spin); */ 1345 unp_scan(so->so_rcv.ssb_mb, unp_mark, info); 1346 /* spin_unlock_wr(&so->so_rcv.sb_spin);*/ 1347 return (0); 1348 } 1349 1350 void 1351 unp_dispose(struct mbuf *m) 1352 { 1353 if (m) 1354 unp_scan(m, unp_discard, NULL); 1355 } 1356 1357 static int 1358 unp_listen(struct unpcb *unp, struct thread *td) 1359 { 1360 struct proc *p = td->td_proc; 1361 1362 KKASSERT(p); 1363 cru2x(p->p_ucred, &unp->unp_peercred); 1364 unp->unp_flags |= UNP_HAVEPCCACHED; 1365 return (0); 1366 } 1367 1368 static void 1369 unp_scan(struct mbuf *m0, void (*op)(struct file *, void *), void *data) 1370 { 1371 struct mbuf *m; 1372 struct file **rp; 1373 struct cmsghdr *cm; 1374 int i; 1375 int qfds; 1376 1377 while (m0) { 1378 for (m = m0; m; m = m->m_next) { 1379 if (m->m_type == MT_CONTROL && 1380 m->m_len >= sizeof(*cm)) { 1381 cm = mtod(m, struct cmsghdr *); 1382 if (cm->cmsg_level != SOL_SOCKET || 1383 cm->cmsg_type != SCM_RIGHTS) 1384 continue; 1385 qfds = (cm->cmsg_len - 1386 (CMSG_DATA(cm) - (u_char *)cm)) 1387 / sizeof (struct file *); 1388 rp = (struct file **)CMSG_DATA(cm); 1389 for (i = 0; i < qfds; i++) 1390 (*op)(*rp++, data); 1391 break; /* XXX, but saves time */ 1392 } 1393 } 1394 m0 = m0->m_nextpkt; 1395 } 1396 } 1397 1398 static void 1399 unp_mark(struct file *fp, void *data) 1400 { 1401 struct unp_gc_info *info = data; 1402 1403 if (info->locked_fp != fp) 1404 spin_lock_wr(&fp->f_spin); 1405 if ((fp->f_flag & FMARK) == 0) { 1406 ++info->defer; 1407 fp->f_flag |= (FMARK|FDEFER); 1408 } 1409 if (info->locked_fp != fp) 1410 spin_unlock_wr(&fp->f_spin); 1411 } 1412 1413 static void 1414 unp_discard(struct file *fp, void *data __unused) 1415 { 1416 spin_lock_wr(&unp_spin); 1417 fp->f_msgcount--; 1418 unp_rights--; 1419 spin_unlock_wr(&unp_spin); 1420 closef(fp, NULL); 1421 } 1422 1423