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 1.34 2007/04/22 01:13:10 dillon 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 } else { 361 sbappend(&so2->so_rcv.sb, m); 362 } 363 so->so_snd.ssb_mbmax -= 364 so2->so_rcv.ssb_mbcnt - unp->unp_conn->unp_mbcnt; 365 unp->unp_conn->unp_mbcnt = so2->so_rcv.ssb_mbcnt; 366 newhiwat = so->so_snd.ssb_hiwat - 367 (so2->so_rcv.ssb_cc - unp->unp_conn->unp_cc); 368 chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.ssb_hiwat, 369 newhiwat, RLIM_INFINITY); 370 unp->unp_conn->unp_cc = so2->so_rcv.ssb_cc; 371 sorwakeup(so2); 372 m = NULL; 373 break; 374 375 default: 376 panic("uipc_send unknown socktype"); 377 } 378 379 /* 380 * SEND_EOF is equivalent to a SEND followed by a SHUTDOWN. 381 */ 382 if (flags & PRUS_EOF) { 383 socantsendmore(so); 384 unp_shutdown(unp); 385 } 386 387 if (control && error != 0) 388 unp_dispose(control); 389 390 release: 391 if (control) 392 m_freem(control); 393 if (m) 394 m_freem(m); 395 return error; 396 } 397 398 static int 399 uipc_sense(struct socket *so, struct stat *sb) 400 { 401 struct unpcb *unp = so->so_pcb; 402 struct socket *so2; 403 404 if (unp == NULL) 405 return EINVAL; 406 sb->st_blksize = so->so_snd.ssb_hiwat; 407 if (so->so_type == SOCK_STREAM && unp->unp_conn != NULL) { 408 so2 = unp->unp_conn->unp_socket; 409 sb->st_blksize += so2->so_rcv.ssb_cc; 410 } 411 sb->st_dev = NOUDEV; 412 if (unp->unp_ino == 0) /* make up a non-zero inode number */ 413 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 414 sb->st_ino = unp->unp_ino; 415 return (0); 416 } 417 418 static int 419 uipc_shutdown(struct socket *so) 420 { 421 struct unpcb *unp = so->so_pcb; 422 423 if (unp == NULL) 424 return EINVAL; 425 socantsendmore(so); 426 unp_shutdown(unp); 427 return 0; 428 } 429 430 static int 431 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 432 { 433 struct unpcb *unp = so->so_pcb; 434 435 if (unp == NULL) 436 return EINVAL; 437 if (unp->unp_addr) 438 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr); 439 return 0; 440 } 441 442 struct pr_usrreqs uipc_usrreqs = { 443 .pru_abort = uipc_abort, 444 .pru_accept = uipc_accept, 445 .pru_attach = uipc_attach, 446 .pru_bind = uipc_bind, 447 .pru_connect = uipc_connect, 448 .pru_connect2 = uipc_connect2, 449 .pru_control = pru_control_notsupp, 450 .pru_detach = uipc_detach, 451 .pru_disconnect = uipc_disconnect, 452 .pru_listen = uipc_listen, 453 .pru_peeraddr = uipc_peeraddr, 454 .pru_rcvd = uipc_rcvd, 455 .pru_rcvoob = pru_rcvoob_notsupp, 456 .pru_send = uipc_send, 457 .pru_sense = uipc_sense, 458 .pru_shutdown = uipc_shutdown, 459 .pru_sockaddr = uipc_sockaddr, 460 .pru_sosend = sosend, 461 .pru_soreceive = soreceive, 462 .pru_sopoll = sopoll 463 }; 464 465 int 466 uipc_ctloutput(struct socket *so, struct sockopt *sopt) 467 { 468 struct unpcb *unp = so->so_pcb; 469 int error; 470 471 switch (sopt->sopt_dir) { 472 case SOPT_GET: 473 switch (sopt->sopt_name) { 474 case LOCAL_PEERCRED: 475 if (unp->unp_flags & UNP_HAVEPC) 476 error = sooptcopyout(sopt, &unp->unp_peercred, 477 sizeof(unp->unp_peercred)); 478 else { 479 if (so->so_type == SOCK_STREAM) 480 error = ENOTCONN; 481 else 482 error = EINVAL; 483 } 484 break; 485 default: 486 error = EOPNOTSUPP; 487 break; 488 } 489 break; 490 case SOPT_SET: 491 default: 492 error = EOPNOTSUPP; 493 break; 494 } 495 return (error); 496 } 497 498 /* 499 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 500 * for stream sockets, although the total for sender and receiver is 501 * actually only PIPSIZ. 502 * Datagram sockets really use the sendspace as the maximum datagram size, 503 * and don't really want to reserve the sendspace. Their recvspace should 504 * be large enough for at least one max-size datagram plus address. 505 */ 506 #ifndef PIPSIZ 507 #define PIPSIZ 8192 508 #endif 509 static u_long unpst_sendspace = PIPSIZ; 510 static u_long unpst_recvspace = PIPSIZ; 511 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 512 static u_long unpdg_recvspace = 4*1024; 513 514 static int unp_rights; /* file descriptors in flight */ 515 static struct spinlock unp_spin = SPINLOCK_INITIALIZER(&unp_spin); 516 517 SYSCTL_DECL(_net_local_stream); 518 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 519 &unpst_sendspace, 0, ""); 520 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 521 &unpst_recvspace, 0, ""); 522 523 SYSCTL_DECL(_net_local_dgram); 524 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 525 &unpdg_sendspace, 0, ""); 526 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 527 &unpdg_recvspace, 0, ""); 528 529 SYSCTL_DECL(_net_local); 530 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 531 532 static int 533 unp_attach(struct socket *so, struct pru_attach_info *ai) 534 { 535 struct unpcb *unp; 536 int error; 537 538 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 539 switch (so->so_type) { 540 541 case SOCK_STREAM: 542 error = soreserve(so, unpst_sendspace, unpst_recvspace, 543 ai->sb_rlimit); 544 break; 545 546 case SOCK_DGRAM: 547 error = soreserve(so, unpdg_sendspace, unpdg_recvspace, 548 ai->sb_rlimit); 549 break; 550 551 default: 552 panic("unp_attach"); 553 } 554 if (error) 555 return (error); 556 } 557 unp = zalloc(unp_zone); 558 if (unp == NULL) 559 return (ENOBUFS); 560 bzero(unp, sizeof *unp); 561 unp->unp_gencnt = ++unp_gencnt; 562 unp_count++; 563 LIST_INIT(&unp->unp_refs); 564 unp->unp_socket = so; 565 unp->unp_rvnode = ai->fd_rdir; /* jail cruft XXX JH */ 566 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 567 : &unp_shead, unp, unp_link); 568 so->so_pcb = (caddr_t)unp; 569 return (0); 570 } 571 572 static void 573 unp_detach(struct unpcb *unp) 574 { 575 LIST_REMOVE(unp, unp_link); 576 unp->unp_gencnt = ++unp_gencnt; 577 --unp_count; 578 if (unp->unp_vnode) { 579 unp->unp_vnode->v_socket = NULL; 580 vrele(unp->unp_vnode); 581 unp->unp_vnode = NULL; 582 } 583 if (unp->unp_conn) 584 unp_disconnect(unp); 585 while (!LIST_EMPTY(&unp->unp_refs)) 586 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 587 soisdisconnected(unp->unp_socket); 588 unp->unp_socket->so_pcb = NULL; 589 if (unp_rights) { 590 /* 591 * Normally the receive buffer is flushed later, 592 * in sofree, but if our receive buffer holds references 593 * to descriptors that are now garbage, we will dispose 594 * of those descriptor references after the garbage collector 595 * gets them (resulting in a "panic: closef: count < 0"). 596 */ 597 sorflush(unp->unp_socket); 598 unp_gc(); 599 } 600 if (unp->unp_addr) 601 kfree(unp->unp_addr, M_SONAME); 602 zfree(unp_zone, unp); 603 } 604 605 static int 606 unp_bind(struct unpcb *unp, struct sockaddr *nam, struct thread *td) 607 { 608 struct proc *p = td->td_proc; 609 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 610 struct vnode *vp; 611 struct vattr vattr; 612 int error, namelen; 613 struct nlookupdata nd; 614 char buf[SOCK_MAXADDRLEN]; 615 616 if (unp->unp_vnode != NULL) 617 return (EINVAL); 618 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 619 if (namelen <= 0) 620 return (EINVAL); 621 strncpy(buf, soun->sun_path, namelen); 622 buf[namelen] = 0; /* null-terminate the string */ 623 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_LOCKVP|NLC_CREATE); 624 if (error == 0) 625 error = nlookup(&nd); 626 if (error == 0 && nd.nl_nch.ncp->nc_vp != NULL) 627 error = EADDRINUSE; 628 if (error) 629 goto done; 630 631 VATTR_NULL(&vattr); 632 vattr.va_type = VSOCK; 633 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask); 634 error = VOP_NCREATE(&nd.nl_nch, &vp, nd.nl_cred, &vattr); 635 if (error == 0) { 636 vp->v_socket = unp->unp_socket; 637 unp->unp_vnode = vp; 638 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam); 639 vn_unlock(vp); 640 } 641 done: 642 nlookup_done(&nd); 643 return (error); 644 } 645 646 static int 647 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 648 { 649 struct proc *p = td->td_proc; 650 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 651 struct vnode *vp; 652 struct socket *so2, *so3; 653 struct unpcb *unp, *unp2, *unp3; 654 int error, len; 655 struct nlookupdata nd; 656 char buf[SOCK_MAXADDRLEN]; 657 658 KKASSERT(p); 659 660 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 661 if (len <= 0) 662 return EINVAL; 663 strncpy(buf, soun->sun_path, len); 664 buf[len] = 0; 665 666 vp = NULL; 667 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW); 668 if (error == 0) 669 error = nlookup(&nd); 670 if (error == 0) 671 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 672 nlookup_done(&nd); 673 if (error) 674 return (error); 675 676 if (vp->v_type != VSOCK) { 677 error = ENOTSOCK; 678 goto bad; 679 } 680 error = VOP_ACCESS(vp, VWRITE, p->p_ucred); 681 if (error) 682 goto bad; 683 so2 = vp->v_socket; 684 if (so2 == NULL) { 685 error = ECONNREFUSED; 686 goto bad; 687 } 688 if (so->so_type != so2->so_type) { 689 error = EPROTOTYPE; 690 goto bad; 691 } 692 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 693 if (!(so2->so_options & SO_ACCEPTCONN) || 694 (so3 = sonewconn(so2, 0)) == NULL) { 695 error = ECONNREFUSED; 696 goto bad; 697 } 698 unp = so->so_pcb; 699 unp2 = so2->so_pcb; 700 unp3 = so3->so_pcb; 701 if (unp2->unp_addr) 702 unp3->unp_addr = (struct sockaddr_un *) 703 dup_sockaddr((struct sockaddr *)unp2->unp_addr); 704 705 /* 706 * unp_peercred management: 707 * 708 * The connecter's (client's) credentials are copied 709 * from its process structure at the time of connect() 710 * (which is now). 711 */ 712 cru2x(p->p_ucred, &unp3->unp_peercred); 713 unp3->unp_flags |= UNP_HAVEPC; 714 /* 715 * The receiver's (server's) credentials are copied 716 * from the unp_peercred member of socket on which the 717 * former called listen(); unp_listen() cached that 718 * process's credentials at that time so we can use 719 * them now. 720 */ 721 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 722 ("unp_connect: listener without cached peercred")); 723 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 724 sizeof(unp->unp_peercred)); 725 unp->unp_flags |= UNP_HAVEPC; 726 727 so2 = so3; 728 } 729 error = unp_connect2(so, so2); 730 bad: 731 vput(vp); 732 return (error); 733 } 734 735 int 736 unp_connect2(struct socket *so, struct socket *so2) 737 { 738 struct unpcb *unp = so->so_pcb; 739 struct unpcb *unp2; 740 741 if (so2->so_type != so->so_type) 742 return (EPROTOTYPE); 743 unp2 = so2->so_pcb; 744 unp->unp_conn = unp2; 745 switch (so->so_type) { 746 747 case SOCK_DGRAM: 748 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 749 soisconnected(so); 750 break; 751 752 case SOCK_STREAM: 753 unp2->unp_conn = unp; 754 soisconnected(so); 755 soisconnected(so2); 756 break; 757 758 default: 759 panic("unp_connect2"); 760 } 761 return (0); 762 } 763 764 static void 765 unp_disconnect(struct unpcb *unp) 766 { 767 struct unpcb *unp2 = unp->unp_conn; 768 769 if (unp2 == NULL) 770 return; 771 772 unp->unp_conn = NULL; 773 774 switch (unp->unp_socket->so_type) { 775 case SOCK_DGRAM: 776 LIST_REMOVE(unp, unp_reflink); 777 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 778 break; 779 case SOCK_STREAM: 780 soisdisconnected(unp->unp_socket); 781 unp2->unp_conn = NULL; 782 soisdisconnected(unp2->unp_socket); 783 break; 784 } 785 } 786 787 #ifdef notdef 788 void 789 unp_abort(struct unpcb *unp) 790 { 791 792 unp_detach(unp); 793 } 794 #endif 795 796 static int 797 prison_unpcb(struct thread *td, struct unpcb *unp) 798 { 799 struct proc *p; 800 801 if (td == NULL) 802 return (0); 803 if ((p = td->td_proc) == NULL) 804 return (0); 805 if (!p->p_ucred->cr_prison) 806 return (0); 807 if (p->p_fd->fd_rdir == unp->unp_rvnode) 808 return (0); 809 return (1); 810 } 811 812 static int 813 unp_pcblist(SYSCTL_HANDLER_ARGS) 814 { 815 int error, i, n; 816 struct unpcb *unp, **unp_list; 817 unp_gen_t gencnt; 818 struct unp_head *head; 819 820 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 821 822 KKASSERT(curproc != NULL); 823 824 /* 825 * The process of preparing the PCB list is too time-consuming and 826 * resource-intensive to repeat twice on every request. 827 */ 828 if (req->oldptr == NULL) { 829 n = unp_count; 830 req->oldidx = (n + n/8) * sizeof(struct xunpcb); 831 return 0; 832 } 833 834 if (req->newptr != NULL) 835 return EPERM; 836 837 /* 838 * OK, now we're committed to doing something. 839 */ 840 gencnt = unp_gencnt; 841 n = unp_count; 842 843 unp_list = kmalloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 844 if (unp_list == NULL) 845 return ENOMEM; 846 847 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 848 unp = LIST_NEXT(unp, unp_link)) { 849 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->td, unp)) 850 unp_list[i++] = unp; 851 } 852 n = i; /* in case we lost some during malloc */ 853 854 error = 0; 855 for (i = 0; i < n; i++) { 856 unp = unp_list[i]; 857 if (unp->unp_gencnt <= gencnt) { 858 struct xunpcb xu; 859 xu.xu_len = sizeof xu; 860 xu.xu_unpp = unp; 861 /* 862 * XXX - need more locking here to protect against 863 * connect/disconnect races for SMP. 864 */ 865 if (unp->unp_addr) 866 bcopy(unp->unp_addr, &xu.xu_addr, 867 unp->unp_addr->sun_len); 868 if (unp->unp_conn && unp->unp_conn->unp_addr) 869 bcopy(unp->unp_conn->unp_addr, 870 &xu.xu_caddr, 871 unp->unp_conn->unp_addr->sun_len); 872 bcopy(unp, &xu.xu_unp, sizeof *unp); 873 sotoxsocket(unp->unp_socket, &xu.xu_socket); 874 error = SYSCTL_OUT(req, &xu, sizeof xu); 875 } 876 } 877 kfree(unp_list, M_TEMP); 878 return error; 879 } 880 881 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 882 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 883 "List of active local datagram sockets"); 884 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 885 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 886 "List of active local stream sockets"); 887 888 static void 889 unp_shutdown(struct unpcb *unp) 890 { 891 struct socket *so; 892 893 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn != NULL && 894 (so = unp->unp_conn->unp_socket)) 895 socantrcvmore(so); 896 } 897 898 static void 899 unp_drop(struct unpcb *unp, int err) 900 { 901 struct socket *so = unp->unp_socket; 902 903 so->so_error = err; 904 unp_disconnect(unp); 905 } 906 907 #ifdef notdef 908 void 909 unp_drain(void) 910 { 911 912 } 913 #endif 914 915 int 916 unp_externalize(struct mbuf *rights) 917 { 918 struct proc *p = curproc; /* XXX */ 919 int i; 920 struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 921 int *fdp; 922 struct file **rp; 923 struct file *fp; 924 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm)) 925 / sizeof (struct file *); 926 int f; 927 928 /* 929 * if the new FD's will not fit, then we free them all 930 */ 931 if (!fdavail(p, newfds)) { 932 rp = (struct file **)CMSG_DATA(cm); 933 for (i = 0; i < newfds; i++) { 934 fp = *rp; 935 /* 936 * zero the pointer before calling unp_discard, 937 * since it may end up in unp_gc().. 938 */ 939 *rp++ = 0; 940 unp_discard(fp, NULL); 941 } 942 return (EMSGSIZE); 943 } 944 /* 945 * now change each pointer to an fd in the global table to 946 * an integer that is the index to the local fd table entry 947 * that we set up to point to the global one we are transferring. 948 * If sizeof (struct file *) is bigger than or equal to sizeof int, 949 * then do it in forward order. In that case, an integer will 950 * always come in the same place or before its corresponding 951 * struct file pointer. 952 * If sizeof (struct file *) is smaller than sizeof int, then 953 * do it in reverse order. 954 */ 955 if (sizeof (struct file *) >= sizeof (int)) { 956 fdp = (int *)(cm + 1); 957 rp = (struct file **)CMSG_DATA(cm); 958 for (i = 0; i < newfds; i++) { 959 if (fdalloc(p, 0, &f)) 960 panic("unp_externalize"); 961 fp = *rp++; 962 fsetfd(p, fp, f); 963 fdrop(fp); 964 spin_lock_wr(&unp_spin); 965 fp->f_msgcount--; 966 unp_rights--; 967 spin_unlock_wr(&unp_spin); 968 *fdp++ = f; 969 } 970 } else { 971 fdp = (int *)(cm + 1) + newfds - 1; 972 rp = (struct file **)CMSG_DATA(cm) + newfds - 1; 973 for (i = 0; i < newfds; i++) { 974 if (fdalloc(p, 0, &f)) 975 panic("unp_externalize"); 976 fp = *rp--; 977 fsetfd(p, fp, f); 978 fdrop(fp); 979 spin_lock_wr(&unp_spin); 980 fp->f_msgcount--; 981 unp_rights--; 982 spin_unlock_wr(&unp_spin); 983 *fdp-- = f; 984 } 985 } 986 987 /* 988 * Adjust length, in case sizeof(struct file *) and sizeof(int) 989 * differs. 990 */ 991 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int)); 992 rights->m_len = cm->cmsg_len; 993 return (0); 994 } 995 996 void 997 unp_init(void) 998 { 999 unp_zone = zinit("unpcb", sizeof(struct unpcb), nmbclusters, 0, 0); 1000 if (unp_zone == NULL) 1001 panic("unp_init"); 1002 LIST_INIT(&unp_dhead); 1003 LIST_INIT(&unp_shead); 1004 spin_init(&unp_spin); 1005 } 1006 1007 static int 1008 unp_internalize(struct mbuf *control, struct thread *td) 1009 { 1010 struct proc *p = td->td_proc; 1011 struct filedesc *fdescp; 1012 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1013 struct file **rp; 1014 struct file *fp; 1015 int i, fd, *fdp; 1016 struct cmsgcred *cmcred; 1017 int oldfds; 1018 u_int newlen; 1019 1020 KKASSERT(p); 1021 fdescp = p->p_fd; 1022 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) || 1023 cm->cmsg_level != SOL_SOCKET || cm->cmsg_len != control->m_len) 1024 return (EINVAL); 1025 1026 /* 1027 * Fill in credential information. 1028 */ 1029 if (cm->cmsg_type == SCM_CREDS) { 1030 cmcred = (struct cmsgcred *)(cm + 1); 1031 cmcred->cmcred_pid = p->p_pid; 1032 cmcred->cmcred_uid = p->p_ucred->cr_ruid; 1033 cmcred->cmcred_gid = p->p_ucred->cr_rgid; 1034 cmcred->cmcred_euid = p->p_ucred->cr_uid; 1035 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups, 1036 CMGROUP_MAX); 1037 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1038 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i]; 1039 return(0); 1040 } 1041 1042 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int); 1043 /* 1044 * check that all the FDs passed in refer to legal OPEN files 1045 * If not, reject the entire operation. 1046 */ 1047 fdp = (int *)(cm + 1); 1048 for (i = 0; i < oldfds; i++) { 1049 fd = *fdp++; 1050 if ((unsigned)fd >= fdescp->fd_nfiles || 1051 fdescp->fd_files[fd].fp == NULL) 1052 return (EBADF); 1053 if (fdescp->fd_files[fd].fp->f_type == DTYPE_KQUEUE) 1054 return (EOPNOTSUPP); 1055 } 1056 /* 1057 * Now replace the integer FDs with pointers to 1058 * the associated global file table entry.. 1059 * Allocate a bigger buffer as necessary. But if an cluster is not 1060 * enough, return E2BIG. 1061 */ 1062 newlen = CMSG_LEN(oldfds * sizeof(struct file *)); 1063 if (newlen > MCLBYTES) 1064 return (E2BIG); 1065 if (newlen - control->m_len > M_TRAILINGSPACE(control)) { 1066 if (control->m_flags & M_EXT) 1067 return (E2BIG); 1068 MCLGET(control, MB_WAIT); 1069 if (!(control->m_flags & M_EXT)) 1070 return (ENOBUFS); 1071 1072 /* copy the data to the cluster */ 1073 memcpy(mtod(control, char *), cm, cm->cmsg_len); 1074 cm = mtod(control, struct cmsghdr *); 1075 } 1076 1077 /* 1078 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1079 * differs. 1080 */ 1081 control->m_len = cm->cmsg_len = newlen; 1082 1083 /* 1084 * Transform the file descriptors into struct file pointers. 1085 * If sizeof (struct file *) is bigger than or equal to sizeof int, 1086 * then do it in reverse order so that the int won't get until 1087 * we're done. 1088 * If sizeof (struct file *) is smaller than sizeof int, then 1089 * do it in forward order. 1090 */ 1091 if (sizeof (struct file *) >= sizeof (int)) { 1092 fdp = (int *)(cm + 1) + oldfds - 1; 1093 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1; 1094 for (i = 0; i < oldfds; i++) { 1095 fp = fdescp->fd_files[*fdp--].fp; 1096 *rp-- = fp; 1097 fhold(fp); 1098 spin_lock_wr(&unp_spin); 1099 fp->f_msgcount++; 1100 unp_rights++; 1101 spin_unlock_wr(&unp_spin); 1102 } 1103 } else { 1104 fdp = (int *)(cm + 1); 1105 rp = (struct file **)CMSG_DATA(cm); 1106 for (i = 0; i < oldfds; i++) { 1107 fp = fdescp->fd_files[*fdp++].fp; 1108 *rp++ = fp; 1109 fhold(fp); 1110 spin_lock_wr(&unp_spin); 1111 fp->f_msgcount++; 1112 unp_rights++; 1113 spin_unlock_wr(&unp_spin); 1114 } 1115 } 1116 return (0); 1117 } 1118 1119 /* 1120 * Garbage collect in-transit file descriptors that get lost due to 1121 * loops (i.e. when a socket is sent to another process over itself, 1122 * and more complex situations). 1123 * 1124 * NOT MPSAFE - TODO socket flush code and maybe closef. Rest is MPSAFE. 1125 */ 1126 1127 struct unp_gc_info { 1128 struct file **extra_ref; 1129 struct file *locked_fp; 1130 int defer; 1131 int index; 1132 int maxindex; 1133 }; 1134 1135 static void 1136 unp_gc(void) 1137 { 1138 struct unp_gc_info info; 1139 static boolean_t unp_gcing; 1140 struct file **fpp; 1141 int i; 1142 1143 spin_lock_wr(&unp_spin); 1144 if (unp_gcing) { 1145 spin_unlock_wr(&unp_spin); 1146 return; 1147 } 1148 unp_gcing = TRUE; 1149 spin_unlock_wr(&unp_spin); 1150 1151 /* 1152 * before going through all this, set all FDs to 1153 * be NOT defered and NOT externally accessible 1154 */ 1155 info.defer = 0; 1156 allfiles_scan_exclusive(unp_gc_clearmarks, NULL); 1157 do { 1158 allfiles_scan_exclusive(unp_gc_checkmarks, &info); 1159 } while (info.defer); 1160 1161 /* 1162 * We grab an extra reference to each of the file table entries 1163 * that are not otherwise accessible and then free the rights 1164 * that are stored in messages on them. 1165 * 1166 * The bug in the orginal code is a little tricky, so I'll describe 1167 * what's wrong with it here. 1168 * 1169 * It is incorrect to simply unp_discard each entry for f_msgcount 1170 * times -- consider the case of sockets A and B that contain 1171 * references to each other. On a last close of some other socket, 1172 * we trigger a gc since the number of outstanding rights (unp_rights) 1173 * is non-zero. If during the sweep phase the gc code un_discards, 1174 * we end up doing a (full) closef on the descriptor. A closef on A 1175 * results in the following chain. Closef calls soo_close, which 1176 * calls soclose. Soclose calls first (through the switch 1177 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1178 * returns because the previous instance had set unp_gcing, and 1179 * we return all the way back to soclose, which marks the socket 1180 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1181 * to free up the rights that are queued in messages on the socket A, 1182 * i.e., the reference on B. The sorflush calls via the dom_dispose 1183 * switch unp_dispose, which unp_scans with unp_discard. This second 1184 * instance of unp_discard just calls closef on B. 1185 * 1186 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1187 * which results in another closef on A. Unfortunately, A is already 1188 * being closed, and the descriptor has already been marked with 1189 * SS_NOFDREF, and soclose panics at this point. 1190 * 1191 * Here, we first take an extra reference to each inaccessible 1192 * descriptor. Then, we call sorflush ourself, since we know 1193 * it is a Unix domain socket anyhow. After we destroy all the 1194 * rights carried in messages, we do a last closef to get rid 1195 * of our extra reference. This is the last close, and the 1196 * unp_detach etc will shut down the socket. 1197 * 1198 * 91/09/19, bsy@cs.cmu.edu 1199 */ 1200 info.extra_ref = kmalloc(256 * sizeof(struct file *), M_FILE, M_WAITOK); 1201 info.maxindex = 256; 1202 1203 do { 1204 /* 1205 * Look for matches 1206 */ 1207 info.index = 0; 1208 allfiles_scan_exclusive(unp_gc_checkrefs, &info); 1209 1210 /* 1211 * For each FD on our hit list, do the following two things 1212 */ 1213 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) { 1214 struct file *tfp = *fpp; 1215 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) 1216 sorflush((struct socket *)(tfp->f_data)); 1217 } 1218 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) 1219 closef(*fpp, NULL); 1220 } while (info.index == info.maxindex); 1221 kfree((caddr_t)info.extra_ref, M_FILE); 1222 unp_gcing = FALSE; 1223 } 1224 1225 /* 1226 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1227 */ 1228 static int 1229 unp_gc_checkrefs(struct file *fp, void *data) 1230 { 1231 struct unp_gc_info *info = data; 1232 1233 if (fp->f_count == 0) 1234 return(0); 1235 if (info->index == info->maxindex) 1236 return(-1); 1237 1238 /* 1239 * If all refs are from msgs, and it's not marked accessible 1240 * then it must be referenced from some unreachable cycle 1241 * of (shut-down) FDs, so include it in our 1242 * list of FDs to remove 1243 */ 1244 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) { 1245 info->extra_ref[info->index++] = fp; 1246 fhold(fp); 1247 } 1248 return(0); 1249 } 1250 1251 /* 1252 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1253 */ 1254 static int 1255 unp_gc_clearmarks(struct file *fp, void *data __unused) 1256 { 1257 fp->f_flag &= ~(FMARK|FDEFER); 1258 return(0); 1259 } 1260 1261 /* 1262 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1263 */ 1264 static int 1265 unp_gc_checkmarks(struct file *fp, void *data) 1266 { 1267 struct unp_gc_info *info = data; 1268 struct socket *so; 1269 1270 /* 1271 * If the file is not open, skip it 1272 */ 1273 if (fp->f_count == 0) 1274 return(0); 1275 /* 1276 * If we already marked it as 'defer' in a 1277 * previous pass, then try process it this time 1278 * and un-mark it 1279 */ 1280 if (fp->f_flag & FDEFER) { 1281 fp->f_flag &= ~FDEFER; 1282 --info->defer; 1283 } else { 1284 /* 1285 * if it's not defered, then check if it's 1286 * already marked.. if so skip it 1287 */ 1288 if (fp->f_flag & FMARK) 1289 return(0); 1290 /* 1291 * If all references are from messages 1292 * in transit, then skip it. it's not 1293 * externally accessible. 1294 */ 1295 if (fp->f_count == fp->f_msgcount) 1296 return(0); 1297 /* 1298 * If it got this far then it must be 1299 * externally accessible. 1300 */ 1301 fp->f_flag |= FMARK; 1302 } 1303 /* 1304 * either it was defered, or it is externally 1305 * accessible and not already marked so. 1306 * Now check if it is possibly one of OUR sockets. 1307 */ 1308 if (fp->f_type != DTYPE_SOCKET || 1309 (so = (struct socket *)fp->f_data) == NULL) 1310 return(0); 1311 if (so->so_proto->pr_domain != &localdomain || 1312 !(so->so_proto->pr_flags & PR_RIGHTS)) 1313 return(0); 1314 #ifdef notdef 1315 XXX note: exclusive fp->f_spin lock held 1316 if (so->so_rcv.sb_flags & SB_LOCK) { 1317 /* 1318 * This is problematical; it's not clear 1319 * we need to wait for the sockbuf to be 1320 * unlocked (on a uniprocessor, at least), 1321 * and it's also not clear what to do 1322 * if sbwait returns an error due to receipt 1323 * of a signal. If sbwait does return 1324 * an error, we'll go into an infinite 1325 * loop. Delete all of this for now. 1326 */ 1327 sbwait(&so->so_rcv); 1328 goto restart; 1329 } 1330 #endif 1331 /* 1332 * So, Ok, it's one of our sockets and it IS externally 1333 * accessible (or was defered). Now we look 1334 * to see if we hold any file descriptors in its 1335 * message buffers. Follow those links and mark them 1336 * as accessible too. 1337 */ 1338 info->locked_fp = fp; 1339 /* spin_lock_wr(&so->so_rcv.sb_spin); */ 1340 unp_scan(so->so_rcv.ssb_mb, unp_mark, info); 1341 /* spin_unlock_wr(&so->so_rcv.sb_spin);*/ 1342 return (0); 1343 } 1344 1345 void 1346 unp_dispose(struct mbuf *m) 1347 { 1348 if (m) 1349 unp_scan(m, unp_discard, NULL); 1350 } 1351 1352 static int 1353 unp_listen(struct unpcb *unp, struct thread *td) 1354 { 1355 struct proc *p = td->td_proc; 1356 1357 KKASSERT(p); 1358 cru2x(p->p_ucred, &unp->unp_peercred); 1359 unp->unp_flags |= UNP_HAVEPCCACHED; 1360 return (0); 1361 } 1362 1363 static void 1364 unp_scan(struct mbuf *m0, void (*op)(struct file *, void *), void *data) 1365 { 1366 struct mbuf *m; 1367 struct file **rp; 1368 struct cmsghdr *cm; 1369 int i; 1370 int qfds; 1371 1372 while (m0) { 1373 for (m = m0; m; m = m->m_next) { 1374 if (m->m_type == MT_CONTROL && 1375 m->m_len >= sizeof(*cm)) { 1376 cm = mtod(m, struct cmsghdr *); 1377 if (cm->cmsg_level != SOL_SOCKET || 1378 cm->cmsg_type != SCM_RIGHTS) 1379 continue; 1380 qfds = (cm->cmsg_len - 1381 (CMSG_DATA(cm) - (u_char *)cm)) 1382 / sizeof (struct file *); 1383 rp = (struct file **)CMSG_DATA(cm); 1384 for (i = 0; i < qfds; i++) 1385 (*op)(*rp++, data); 1386 break; /* XXX, but saves time */ 1387 } 1388 } 1389 m0 = m0->m_nextpkt; 1390 } 1391 } 1392 1393 static void 1394 unp_mark(struct file *fp, void *data) 1395 { 1396 struct unp_gc_info *info = data; 1397 1398 if (info->locked_fp != fp) 1399 spin_lock_wr(&fp->f_spin); 1400 if ((fp->f_flag & FMARK) == 0) { 1401 ++info->defer; 1402 fp->f_flag |= (FMARK|FDEFER); 1403 } 1404 if (info->locked_fp != fp) 1405 spin_unlock_wr(&fp->f_spin); 1406 } 1407 1408 static void 1409 unp_discard(struct file *fp, void *data __unused) 1410 { 1411 spin_lock_wr(&unp_spin); 1412 fp->f_msgcount--; 1413 unp_rights--; 1414 spin_unlock_wr(&unp_spin); 1415 closef(fp, NULL); 1416 } 1417 1418