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 1.44 2008/09/06 05:44:58 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 63 static MALLOC_DEFINE(M_UNPCB, "unpcb", "unpcb struct"); 64 static unp_gen_t unp_gencnt; 65 static u_int unp_count; 66 67 static struct unp_head unp_shead, unp_dhead; 68 69 /* 70 * Unix communications domain. 71 * 72 * TODO: 73 * RDM 74 * rethink name space problems 75 * need a proper out-of-band 76 * lock pushdown 77 */ 78 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 79 static ino_t unp_ino; /* prototype for fake inode numbers */ 80 81 static int unp_attach (struct socket *, struct pru_attach_info *); 82 static void unp_detach (struct unpcb *); 83 static int unp_bind (struct unpcb *,struct sockaddr *, struct thread *); 84 static int unp_connect (struct socket *,struct sockaddr *, 85 struct thread *); 86 static void unp_disconnect (struct unpcb *); 87 static void unp_shutdown (struct unpcb *); 88 static void unp_drop (struct unpcb *, int); 89 static void unp_gc (void); 90 static int unp_gc_clearmarks(struct file *, void *); 91 static int unp_gc_checkmarks(struct file *, void *); 92 static int unp_gc_checkrefs(struct file *, void *); 93 static void unp_scan (struct mbuf *, void (*)(struct file *, void *), 94 void *data); 95 static void unp_mark (struct file *, void *data); 96 static void unp_discard (struct file *, void *); 97 static int unp_internalize (struct mbuf *, struct thread *); 98 static int unp_listen (struct unpcb *, struct thread *); 99 100 static int 101 uipc_abort(struct socket *so) 102 { 103 struct unpcb *unp = so->so_pcb; 104 105 if (unp == NULL) 106 return EINVAL; 107 unp_drop(unp, ECONNABORTED); 108 unp_detach(unp); 109 sofree(so); 110 return 0; 111 } 112 113 static int 114 uipc_accept(struct socket *so, struct sockaddr **nam) 115 { 116 struct unpcb *unp = so->so_pcb; 117 118 if (unp == NULL) 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 } else { 129 *nam = dup_sockaddr((struct sockaddr *)&sun_noname); 130 } 131 return 0; 132 } 133 134 static int 135 uipc_attach(struct socket *so, int proto, struct pru_attach_info *ai) 136 { 137 struct unpcb *unp = so->so_pcb; 138 139 if (unp != NULL) 140 return EISCONN; 141 return unp_attach(so, ai); 142 } 143 144 static int 145 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 146 { 147 struct unpcb *unp = so->so_pcb; 148 149 if (unp == NULL) 150 return EINVAL; 151 return unp_bind(unp, nam, td); 152 } 153 154 static int 155 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 156 { 157 struct unpcb *unp = so->so_pcb; 158 159 if (unp == NULL) 160 return EINVAL; 161 return unp_connect(so, nam, td); 162 } 163 164 static int 165 uipc_connect2(struct socket *so1, struct socket *so2) 166 { 167 struct unpcb *unp = so1->so_pcb; 168 169 if (unp == NULL) 170 return EINVAL; 171 172 return unp_connect2(so1, so2); 173 } 174 175 /* control is EOPNOTSUPP */ 176 177 static int 178 uipc_detach(struct socket *so) 179 { 180 struct unpcb *unp = so->so_pcb; 181 182 if (unp == NULL) 183 return EINVAL; 184 185 unp_detach(unp); 186 return 0; 187 } 188 189 static int 190 uipc_disconnect(struct socket *so) 191 { 192 struct unpcb *unp = so->so_pcb; 193 194 if (unp == NULL) 195 return EINVAL; 196 unp_disconnect(unp); 197 return 0; 198 } 199 200 static int 201 uipc_listen(struct socket *so, struct thread *td) 202 { 203 struct unpcb *unp = so->so_pcb; 204 205 if (unp == NULL || unp->unp_vnode == NULL) 206 return EINVAL; 207 return unp_listen(unp, td); 208 } 209 210 static int 211 uipc_peeraddr(struct socket *so, struct sockaddr **nam) 212 { 213 struct unpcb *unp = so->so_pcb; 214 215 if (unp == NULL) 216 return EINVAL; 217 if (unp->unp_conn && unp->unp_conn->unp_addr) 218 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr); 219 else { 220 /* 221 * XXX: It seems that this test always fails even when 222 * connection is established. So, this else clause is 223 * added as workaround to return PF_LOCAL sockaddr. 224 */ 225 *nam = dup_sockaddr((struct sockaddr *)&sun_noname); 226 } 227 return 0; 228 } 229 230 static int 231 uipc_rcvd(struct socket *so, int flags) 232 { 233 struct unpcb *unp = so->so_pcb; 234 struct socket *so2; 235 236 if (unp == NULL) 237 return EINVAL; 238 switch (so->so_type) { 239 case SOCK_DGRAM: 240 panic("uipc_rcvd DGRAM?"); 241 /*NOTREACHED*/ 242 243 case SOCK_STREAM: 244 case SOCK_SEQPACKET: 245 if (unp->unp_conn == NULL) 246 break; 247 /* 248 * Because we are transfering mbufs directly to the 249 * peer socket we have to use SSB_STOP on the sender 250 * to prevent it from building up infinite mbufs. 251 */ 252 so2 = unp->unp_conn->unp_socket; 253 if (so->so_rcv.ssb_cc < so2->so_snd.ssb_hiwat && 254 so->so_rcv.ssb_mbcnt < so2->so_snd.ssb_mbmax 255 ) { 256 so2->so_snd.ssb_flags &= ~SSB_STOP; 257 sowwakeup(so2); 258 } 259 break; 260 261 default: 262 panic("uipc_rcvd unknown socktype"); 263 } 264 return 0; 265 } 266 267 /* pru_rcvoob is EOPNOTSUPP */ 268 269 static int 270 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 271 struct mbuf *control, struct thread *td) 272 { 273 int error = 0; 274 struct unpcb *unp = so->so_pcb; 275 struct socket *so2; 276 277 if (unp == NULL) { 278 error = EINVAL; 279 goto release; 280 } 281 if (flags & PRUS_OOB) { 282 error = EOPNOTSUPP; 283 goto release; 284 } 285 286 if (control && (error = unp_internalize(control, td))) 287 goto release; 288 289 switch (so->so_type) { 290 case SOCK_DGRAM: 291 { 292 struct sockaddr *from; 293 294 if (nam) { 295 if (unp->unp_conn) { 296 error = EISCONN; 297 break; 298 } 299 error = unp_connect(so, nam, td); 300 if (error) 301 break; 302 } else { 303 if (unp->unp_conn == NULL) { 304 error = ENOTCONN; 305 break; 306 } 307 } 308 so2 = unp->unp_conn->unp_socket; 309 if (unp->unp_addr) 310 from = (struct sockaddr *)unp->unp_addr; 311 else 312 from = &sun_noname; 313 if (ssb_appendaddr(&so2->so_rcv, from, m, control)) { 314 sorwakeup(so2); 315 m = NULL; 316 control = NULL; 317 } else { 318 error = ENOBUFS; 319 } 320 if (nam) 321 unp_disconnect(unp); 322 break; 323 } 324 325 case SOCK_STREAM: 326 case SOCK_SEQPACKET: 327 /* Connect if not connected yet. */ 328 /* 329 * Note: A better implementation would complain 330 * if not equal to the peer's address. 331 */ 332 if (!(so->so_state & SS_ISCONNECTED)) { 333 if (nam) { 334 error = unp_connect(so, nam, td); 335 if (error) 336 break; /* XXX */ 337 } else { 338 error = ENOTCONN; 339 break; 340 } 341 } 342 343 if (so->so_state & SS_CANTSENDMORE) { 344 error = EPIPE; 345 break; 346 } 347 if (unp->unp_conn == NULL) 348 panic("uipc_send connected but no connection?"); 349 so2 = unp->unp_conn->unp_socket; 350 /* 351 * Send to paired receive port, and then reduce 352 * send buffer hiwater marks to maintain backpressure. 353 * Wake up readers. 354 */ 355 if (control) { 356 if (ssb_appendcontrol(&so2->so_rcv, m, control)) { 357 control = NULL; 358 m = NULL; 359 } 360 } else if (so->so_type == SOCK_SEQPACKET) { 361 sbappendrecord(&so2->so_rcv.sb, m); 362 m = NULL; 363 } else { 364 sbappend(&so2->so_rcv.sb, m); 365 m = NULL; 366 } 367 368 /* 369 * Because we are transfering mbufs directly to the 370 * peer socket we have to use SSB_STOP on the sender 371 * to prevent it from building up infinite mbufs. 372 */ 373 if (so2->so_rcv.ssb_cc >= so->so_snd.ssb_hiwat || 374 so2->so_rcv.ssb_mbcnt >= so->so_snd.ssb_mbmax 375 ) { 376 so->so_snd.ssb_flags |= SSB_STOP; 377 } 378 sorwakeup(so2); 379 break; 380 381 default: 382 panic("uipc_send unknown socktype"); 383 } 384 385 /* 386 * SEND_EOF is equivalent to a SEND followed by a SHUTDOWN. 387 */ 388 if (flags & PRUS_EOF) { 389 socantsendmore(so); 390 unp_shutdown(unp); 391 } 392 393 if (control && error != 0) 394 unp_dispose(control); 395 396 release: 397 if (control) 398 m_freem(control); 399 if (m) 400 m_freem(m); 401 return error; 402 } 403 404 static int 405 uipc_sense(struct socket *so, struct stat *sb) 406 { 407 struct unpcb *unp = so->so_pcb; 408 409 if (unp == NULL) 410 return EINVAL; 411 sb->st_blksize = so->so_snd.ssb_hiwat; 412 sb->st_dev = NOUDEV; 413 if (unp->unp_ino == 0) /* make up a non-zero inode number */ 414 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 415 sb->st_ino = unp->unp_ino; 416 return (0); 417 } 418 419 static int 420 uipc_shutdown(struct socket *so) 421 { 422 struct unpcb *unp = so->so_pcb; 423 424 if (unp == NULL) 425 return EINVAL; 426 socantsendmore(so); 427 unp_shutdown(unp); 428 return 0; 429 } 430 431 static int 432 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 433 { 434 struct unpcb *unp = so->so_pcb; 435 436 if (unp == NULL) 437 return EINVAL; 438 if (unp->unp_addr) 439 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr); 440 return 0; 441 } 442 443 struct pr_usrreqs uipc_usrreqs = { 444 .pru_abort = uipc_abort, 445 .pru_accept = uipc_accept, 446 .pru_attach = uipc_attach, 447 .pru_bind = uipc_bind, 448 .pru_connect = uipc_connect, 449 .pru_connect2 = uipc_connect2, 450 .pru_control = pru_control_notsupp, 451 .pru_detach = uipc_detach, 452 .pru_disconnect = uipc_disconnect, 453 .pru_listen = uipc_listen, 454 .pru_peeraddr = uipc_peeraddr, 455 .pru_rcvd = uipc_rcvd, 456 .pru_rcvoob = pru_rcvoob_notsupp, 457 .pru_send = uipc_send, 458 .pru_sense = uipc_sense, 459 .pru_shutdown = uipc_shutdown, 460 .pru_sockaddr = uipc_sockaddr, 461 .pru_sosend = sosend, 462 .pru_soreceive = soreceive, 463 .pru_sopoll = sopoll 464 }; 465 466 int 467 uipc_ctloutput(struct socket *so, struct sockopt *sopt) 468 { 469 struct unpcb *unp = so->so_pcb; 470 int error = 0; 471 472 switch (sopt->sopt_dir) { 473 case SOPT_GET: 474 switch (sopt->sopt_name) { 475 case LOCAL_PEERCRED: 476 if (unp->unp_flags & UNP_HAVEPC) 477 soopt_from_kbuf(sopt, &unp->unp_peercred, 478 sizeof(unp->unp_peercred)); 479 else { 480 if (so->so_type == SOCK_STREAM) 481 error = ENOTCONN; 482 else if (so->so_type == SOCK_SEQPACKET) 483 error = ENOTCONN; 484 else 485 error = EINVAL; 486 } 487 break; 488 default: 489 error = EOPNOTSUPP; 490 break; 491 } 492 break; 493 case SOPT_SET: 494 default: 495 error = EOPNOTSUPP; 496 break; 497 } 498 return (error); 499 } 500 501 /* 502 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 503 * for stream sockets, although the total for sender and receiver is 504 * actually only PIPSIZ. 505 * 506 * Datagram sockets really use the sendspace as the maximum datagram size, 507 * and don't really want to reserve the sendspace. Their recvspace should 508 * be large enough for at least one max-size datagram plus address. 509 * 510 * We want the local send/recv space to be significant larger then lo0's 511 * mtu of 16384. 512 */ 513 #ifndef PIPSIZ 514 #define PIPSIZ 57344 515 #endif 516 static u_long unpst_sendspace = PIPSIZ; 517 static u_long unpst_recvspace = PIPSIZ; 518 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 519 static u_long unpdg_recvspace = 4*1024; 520 521 static int unp_rights; /* file descriptors in flight */ 522 static struct spinlock unp_spin = SPINLOCK_INITIALIZER(&unp_spin); 523 524 SYSCTL_DECL(_net_local_seqpacket); 525 SYSCTL_DECL(_net_local_stream); 526 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 527 &unpst_sendspace, 0, ""); 528 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 529 &unpst_recvspace, 0, ""); 530 531 SYSCTL_DECL(_net_local_dgram); 532 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 533 &unpdg_sendspace, 0, ""); 534 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 535 &unpdg_recvspace, 0, ""); 536 537 SYSCTL_DECL(_net_local); 538 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 539 540 static int 541 unp_attach(struct socket *so, struct pru_attach_info *ai) 542 { 543 struct unpcb *unp; 544 int error; 545 546 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 547 switch (so->so_type) { 548 549 case SOCK_STREAM: 550 case SOCK_SEQPACKET: 551 error = soreserve(so, unpst_sendspace, unpst_recvspace, 552 ai->sb_rlimit); 553 break; 554 555 case SOCK_DGRAM: 556 error = soreserve(so, unpdg_sendspace, unpdg_recvspace, 557 ai->sb_rlimit); 558 break; 559 560 default: 561 panic("unp_attach"); 562 } 563 if (error) 564 return (error); 565 } 566 unp = kmalloc(sizeof(*unp), M_UNPCB, M_NOWAIT|M_ZERO); 567 if (unp == NULL) 568 return (ENOBUFS); 569 unp->unp_gencnt = ++unp_gencnt; 570 unp_count++; 571 LIST_INIT(&unp->unp_refs); 572 unp->unp_socket = so; 573 unp->unp_rvnode = ai->fd_rdir; /* jail cruft XXX JH */ 574 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 575 : &unp_shead, unp, unp_link); 576 so->so_pcb = (caddr_t)unp; 577 return (0); 578 } 579 580 static void 581 unp_detach(struct unpcb *unp) 582 { 583 LIST_REMOVE(unp, unp_link); 584 unp->unp_gencnt = ++unp_gencnt; 585 --unp_count; 586 if (unp->unp_vnode) { 587 unp->unp_vnode->v_socket = NULL; 588 vrele(unp->unp_vnode); 589 unp->unp_vnode = NULL; 590 } 591 if (unp->unp_conn) 592 unp_disconnect(unp); 593 while (!LIST_EMPTY(&unp->unp_refs)) 594 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 595 soisdisconnected(unp->unp_socket); 596 unp->unp_socket->so_pcb = NULL; 597 if (unp_rights) { 598 /* 599 * Normally the receive buffer is flushed later, 600 * in sofree, but if our receive buffer holds references 601 * to descriptors that are now garbage, we will dispose 602 * of those descriptor references after the garbage collector 603 * gets them (resulting in a "panic: closef: count < 0"). 604 */ 605 sorflush(unp->unp_socket); 606 unp_gc(); 607 } 608 if (unp->unp_addr) 609 kfree(unp->unp_addr, M_SONAME); 610 kfree(unp, M_UNPCB); 611 } 612 613 static int 614 unp_bind(struct unpcb *unp, struct sockaddr *nam, struct thread *td) 615 { 616 struct proc *p = td->td_proc; 617 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 618 struct vnode *vp; 619 struct vattr vattr; 620 int error, namelen; 621 struct nlookupdata nd; 622 char buf[SOCK_MAXADDRLEN]; 623 624 if (unp->unp_vnode != NULL) 625 return (EINVAL); 626 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 627 if (namelen <= 0) 628 return (EINVAL); 629 strncpy(buf, soun->sun_path, namelen); 630 buf[namelen] = 0; /* null-terminate the string */ 631 error = nlookup_init(&nd, buf, UIO_SYSSPACE, 632 NLC_LOCKVP | NLC_CREATE | NLC_REFDVP); 633 if (error == 0) 634 error = nlookup(&nd); 635 if (error == 0 && nd.nl_nch.ncp->nc_vp != NULL) 636 error = EADDRINUSE; 637 if (error) 638 goto done; 639 640 VATTR_NULL(&vattr); 641 vattr.va_type = VSOCK; 642 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask); 643 error = VOP_NCREATE(&nd.nl_nch, nd.nl_dvp, &vp, nd.nl_cred, &vattr); 644 if (error == 0) { 645 vp->v_socket = unp->unp_socket; 646 unp->unp_vnode = vp; 647 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam); 648 vn_unlock(vp); 649 } 650 done: 651 nlookup_done(&nd); 652 return (error); 653 } 654 655 static int 656 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 657 { 658 struct proc *p = td->td_proc; 659 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 660 struct vnode *vp; 661 struct socket *so2, *so3; 662 struct unpcb *unp, *unp2, *unp3; 663 int error, len; 664 struct nlookupdata nd; 665 char buf[SOCK_MAXADDRLEN]; 666 667 KKASSERT(p); 668 669 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 670 if (len <= 0) 671 return EINVAL; 672 strncpy(buf, soun->sun_path, len); 673 buf[len] = 0; 674 675 vp = NULL; 676 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW); 677 if (error == 0) 678 error = nlookup(&nd); 679 if (error == 0) 680 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 681 nlookup_done(&nd); 682 if (error) 683 return (error); 684 685 if (vp->v_type != VSOCK) { 686 error = ENOTSOCK; 687 goto bad; 688 } 689 error = VOP_ACCESS(vp, VWRITE, p->p_ucred); 690 if (error) 691 goto bad; 692 so2 = vp->v_socket; 693 if (so2 == NULL) { 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) || 703 (so3 = sonewconn(so2, 0)) == NULL) { 704 error = ECONNREFUSED; 705 goto bad; 706 } 707 unp = so->so_pcb; 708 unp2 = so2->so_pcb; 709 unp3 = so3->so_pcb; 710 if (unp2->unp_addr) 711 unp3->unp_addr = (struct sockaddr_un *) 712 dup_sockaddr((struct sockaddr *)unp2->unp_addr); 713 714 /* 715 * unp_peercred management: 716 * 717 * The connecter's (client's) credentials are copied 718 * from its process structure at the time of connect() 719 * (which is now). 720 */ 721 cru2x(p->p_ucred, &unp3->unp_peercred); 722 unp3->unp_flags |= UNP_HAVEPC; 723 /* 724 * The receiver's (server's) credentials are copied 725 * from the unp_peercred member of socket on which the 726 * former called listen(); unp_listen() cached that 727 * process's credentials at that time so we can use 728 * them now. 729 */ 730 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 731 ("unp_connect: listener without cached peercred")); 732 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 733 sizeof(unp->unp_peercred)); 734 unp->unp_flags |= UNP_HAVEPC; 735 736 so2 = so3; 737 } 738 error = unp_connect2(so, so2); 739 bad: 740 vput(vp); 741 return (error); 742 } 743 744 int 745 unp_connect2(struct socket *so, struct socket *so2) 746 { 747 struct unpcb *unp = so->so_pcb; 748 struct unpcb *unp2; 749 750 if (so2->so_type != so->so_type) 751 return (EPROTOTYPE); 752 unp2 = so2->so_pcb; 753 unp->unp_conn = unp2; 754 switch (so->so_type) { 755 756 case SOCK_DGRAM: 757 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 758 soisconnected(so); 759 break; 760 761 case SOCK_STREAM: 762 case SOCK_SEQPACKET: 763 unp2->unp_conn = unp; 764 soisconnected(so); 765 soisconnected(so2); 766 break; 767 768 default: 769 panic("unp_connect2"); 770 } 771 return (0); 772 } 773 774 static void 775 unp_disconnect(struct unpcb *unp) 776 { 777 struct unpcb *unp2 = unp->unp_conn; 778 779 if (unp2 == NULL) 780 return; 781 782 unp->unp_conn = NULL; 783 784 switch (unp->unp_socket->so_type) { 785 case SOCK_DGRAM: 786 LIST_REMOVE(unp, unp_reflink); 787 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 788 break; 789 case SOCK_STREAM: 790 case SOCK_SEQPACKET: 791 soisdisconnected(unp->unp_socket); 792 unp2->unp_conn = NULL; 793 soisdisconnected(unp2->unp_socket); 794 break; 795 } 796 } 797 798 #ifdef notdef 799 void 800 unp_abort(struct unpcb *unp) 801 { 802 803 unp_detach(unp); 804 } 805 #endif 806 807 static int 808 prison_unpcb(struct thread *td, struct unpcb *unp) 809 { 810 struct proc *p; 811 812 if (td == NULL) 813 return (0); 814 if ((p = td->td_proc) == NULL) 815 return (0); 816 if (!p->p_ucred->cr_prison) 817 return (0); 818 if (p->p_fd->fd_rdir == unp->unp_rvnode) 819 return (0); 820 return (1); 821 } 822 823 static int 824 unp_pcblist(SYSCTL_HANDLER_ARGS) 825 { 826 int error, i, n; 827 struct unpcb *unp, **unp_list; 828 unp_gen_t gencnt; 829 struct unp_head *head; 830 831 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 832 833 KKASSERT(curproc != NULL); 834 835 /* 836 * The process of preparing the PCB list is too time-consuming and 837 * resource-intensive to repeat twice on every request. 838 */ 839 if (req->oldptr == NULL) { 840 n = unp_count; 841 req->oldidx = (n + n/8) * sizeof(struct xunpcb); 842 return 0; 843 } 844 845 if (req->newptr != NULL) 846 return EPERM; 847 848 /* 849 * OK, now we're committed to doing something. 850 */ 851 gencnt = unp_gencnt; 852 n = unp_count; 853 854 unp_list = kmalloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 855 856 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 857 unp = LIST_NEXT(unp, unp_link)) { 858 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->td, unp)) 859 unp_list[i++] = unp; 860 } 861 n = i; /* in case we lost some during malloc */ 862 863 error = 0; 864 for (i = 0; i < n; i++) { 865 unp = unp_list[i]; 866 if (unp->unp_gencnt <= gencnt) { 867 struct xunpcb xu; 868 xu.xu_len = sizeof xu; 869 xu.xu_unpp = unp; 870 /* 871 * XXX - need more locking here to protect against 872 * connect/disconnect races for SMP. 873 */ 874 if (unp->unp_addr) 875 bcopy(unp->unp_addr, &xu.xu_addr, 876 unp->unp_addr->sun_len); 877 if (unp->unp_conn && unp->unp_conn->unp_addr) 878 bcopy(unp->unp_conn->unp_addr, 879 &xu.xu_caddr, 880 unp->unp_conn->unp_addr->sun_len); 881 bcopy(unp, &xu.xu_unp, sizeof *unp); 882 sotoxsocket(unp->unp_socket, &xu.xu_socket); 883 error = SYSCTL_OUT(req, &xu, sizeof xu); 884 } 885 } 886 kfree(unp_list, M_TEMP); 887 return error; 888 } 889 890 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 891 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 892 "List of active local datagram sockets"); 893 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 894 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 895 "List of active local stream sockets"); 896 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist, CTLFLAG_RD, 897 (caddr_t)(long)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb", 898 "List of active local seqpacket stream sockets"); 899 900 static void 901 unp_shutdown(struct unpcb *unp) 902 { 903 struct socket *so; 904 905 if ((unp->unp_socket->so_type == SOCK_STREAM || 906 unp->unp_socket->so_type == SOCK_SEQPACKET) && 907 unp->unp_conn != NULL && (so = unp->unp_conn->unp_socket)) { 908 socantrcvmore(so); 909 } 910 } 911 912 static void 913 unp_drop(struct unpcb *unp, int err) 914 { 915 struct socket *so = unp->unp_socket; 916 917 so->so_error = err; 918 unp_disconnect(unp); 919 } 920 921 #ifdef notdef 922 void 923 unp_drain(void) 924 { 925 926 } 927 #endif 928 929 int 930 unp_externalize(struct mbuf *rights) 931 { 932 struct proc *p = curproc; /* XXX */ 933 int i; 934 struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 935 int *fdp; 936 struct file **rp; 937 struct file *fp; 938 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm)) 939 / sizeof (struct file *); 940 int f; 941 942 /* 943 * if the new FD's will not fit, then we free them all 944 */ 945 if (!fdavail(p, newfds)) { 946 rp = (struct file **)CMSG_DATA(cm); 947 for (i = 0; i < newfds; i++) { 948 fp = *rp; 949 /* 950 * zero the pointer before calling unp_discard, 951 * since it may end up in unp_gc().. 952 */ 953 *rp++ = 0; 954 unp_discard(fp, NULL); 955 } 956 return (EMSGSIZE); 957 } 958 /* 959 * now change each pointer to an fd in the global table to 960 * an integer that is the index to the local fd table entry 961 * that we set up to point to the global one we are transferring. 962 * If sizeof (struct file *) is bigger than or equal to sizeof int, 963 * then do it in forward order. In that case, an integer will 964 * always come in the same place or before its corresponding 965 * struct file pointer. 966 * If sizeof (struct file *) is smaller than sizeof int, then 967 * do it in reverse order. 968 */ 969 if (sizeof (struct file *) >= sizeof (int)) { 970 fdp = (int *)(cm + 1); 971 rp = (struct file **)CMSG_DATA(cm); 972 for (i = 0; i < newfds; i++) { 973 if (fdalloc(p, 0, &f)) 974 panic("unp_externalize"); 975 fp = *rp++; 976 fsetfd(p, fp, f); 977 fdrop(fp); 978 spin_lock_wr(&unp_spin); 979 fp->f_msgcount--; 980 unp_rights--; 981 spin_unlock_wr(&unp_spin); 982 *fdp++ = f; 983 } 984 } else { 985 fdp = (int *)(cm + 1) + newfds - 1; 986 rp = (struct file **)CMSG_DATA(cm) + newfds - 1; 987 for (i = 0; i < newfds; i++) { 988 if (fdalloc(p, 0, &f)) 989 panic("unp_externalize"); 990 fp = *rp--; 991 fsetfd(p, fp, f); 992 fdrop(fp); 993 spin_lock_wr(&unp_spin); 994 fp->f_msgcount--; 995 unp_rights--; 996 spin_unlock_wr(&unp_spin); 997 *fdp-- = f; 998 } 999 } 1000 1001 /* 1002 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1003 * differs. 1004 */ 1005 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int)); 1006 rights->m_len = cm->cmsg_len; 1007 return (0); 1008 } 1009 1010 void 1011 unp_init(void) 1012 { 1013 LIST_INIT(&unp_dhead); 1014 LIST_INIT(&unp_shead); 1015 spin_init(&unp_spin); 1016 } 1017 1018 static int 1019 unp_internalize(struct mbuf *control, struct thread *td) 1020 { 1021 struct proc *p = td->td_proc; 1022 struct filedesc *fdescp; 1023 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1024 struct file **rp; 1025 struct file *fp; 1026 int i, fd, *fdp; 1027 struct cmsgcred *cmcred; 1028 int oldfds; 1029 u_int newlen; 1030 1031 KKASSERT(p); 1032 fdescp = p->p_fd; 1033 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) || 1034 cm->cmsg_level != SOL_SOCKET || cm->cmsg_len != control->m_len) 1035 return (EINVAL); 1036 1037 /* 1038 * Fill in credential information. 1039 */ 1040 if (cm->cmsg_type == SCM_CREDS) { 1041 cmcred = (struct cmsgcred *)(cm + 1); 1042 cmcred->cmcred_pid = p->p_pid; 1043 cmcred->cmcred_uid = p->p_ucred->cr_ruid; 1044 cmcred->cmcred_gid = p->p_ucred->cr_rgid; 1045 cmcred->cmcred_euid = p->p_ucred->cr_uid; 1046 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups, 1047 CMGROUP_MAX); 1048 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1049 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i]; 1050 return(0); 1051 } 1052 1053 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int); 1054 /* 1055 * check that all the FDs passed in refer to legal OPEN files 1056 * If not, reject the entire operation. 1057 */ 1058 fdp = (int *)(cm + 1); 1059 for (i = 0; i < oldfds; i++) { 1060 fd = *fdp++; 1061 if ((unsigned)fd >= fdescp->fd_nfiles || 1062 fdescp->fd_files[fd].fp == NULL) 1063 return (EBADF); 1064 if (fdescp->fd_files[fd].fp->f_type == DTYPE_KQUEUE) 1065 return (EOPNOTSUPP); 1066 } 1067 /* 1068 * Now replace the integer FDs with pointers to 1069 * the associated global file table entry.. 1070 * Allocate a bigger buffer as necessary. But if an cluster is not 1071 * enough, return E2BIG. 1072 */ 1073 newlen = CMSG_LEN(oldfds * sizeof(struct file *)); 1074 if (newlen > MCLBYTES) 1075 return (E2BIG); 1076 if (newlen - control->m_len > M_TRAILINGSPACE(control)) { 1077 if (control->m_flags & M_EXT) 1078 return (E2BIG); 1079 MCLGET(control, MB_WAIT); 1080 if (!(control->m_flags & M_EXT)) 1081 return (ENOBUFS); 1082 1083 /* copy the data to the cluster */ 1084 memcpy(mtod(control, char *), cm, cm->cmsg_len); 1085 cm = mtod(control, struct cmsghdr *); 1086 } 1087 1088 /* 1089 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1090 * differs. 1091 */ 1092 control->m_len = cm->cmsg_len = newlen; 1093 1094 /* 1095 * Transform the file descriptors into struct file pointers. 1096 * If sizeof (struct file *) is bigger than or equal to sizeof int, 1097 * then do it in reverse order so that the int won't get until 1098 * we're done. 1099 * If sizeof (struct file *) is smaller than sizeof int, then 1100 * do it in forward order. 1101 */ 1102 if (sizeof (struct file *) >= sizeof (int)) { 1103 fdp = (int *)(cm + 1) + oldfds - 1; 1104 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1; 1105 for (i = 0; i < oldfds; i++) { 1106 fp = fdescp->fd_files[*fdp--].fp; 1107 *rp-- = fp; 1108 fhold(fp); 1109 spin_lock_wr(&unp_spin); 1110 fp->f_msgcount++; 1111 unp_rights++; 1112 spin_unlock_wr(&unp_spin); 1113 } 1114 } else { 1115 fdp = (int *)(cm + 1); 1116 rp = (struct file **)CMSG_DATA(cm); 1117 for (i = 0; i < oldfds; i++) { 1118 fp = fdescp->fd_files[*fdp++].fp; 1119 *rp++ = fp; 1120 fhold(fp); 1121 spin_lock_wr(&unp_spin); 1122 fp->f_msgcount++; 1123 unp_rights++; 1124 spin_unlock_wr(&unp_spin); 1125 } 1126 } 1127 return (0); 1128 } 1129 1130 /* 1131 * Garbage collect in-transit file descriptors that get lost due to 1132 * loops (i.e. when a socket is sent to another process over itself, 1133 * and more complex situations). 1134 * 1135 * NOT MPSAFE - TODO socket flush code and maybe closef. Rest is MPSAFE. 1136 */ 1137 1138 struct unp_gc_info { 1139 struct file **extra_ref; 1140 struct file *locked_fp; 1141 int defer; 1142 int index; 1143 int maxindex; 1144 }; 1145 1146 static void 1147 unp_gc(void) 1148 { 1149 struct unp_gc_info info; 1150 static boolean_t unp_gcing; 1151 struct file **fpp; 1152 int i; 1153 1154 spin_lock_wr(&unp_spin); 1155 if (unp_gcing) { 1156 spin_unlock_wr(&unp_spin); 1157 return; 1158 } 1159 unp_gcing = TRUE; 1160 spin_unlock_wr(&unp_spin); 1161 1162 /* 1163 * before going through all this, set all FDs to 1164 * be NOT defered and NOT externally accessible 1165 */ 1166 info.defer = 0; 1167 allfiles_scan_exclusive(unp_gc_clearmarks, NULL); 1168 do { 1169 allfiles_scan_exclusive(unp_gc_checkmarks, &info); 1170 } while (info.defer); 1171 1172 /* 1173 * We grab an extra reference to each of the file table entries 1174 * that are not otherwise accessible and then free the rights 1175 * that are stored in messages on them. 1176 * 1177 * The bug in the orginal code is a little tricky, so I'll describe 1178 * what's wrong with it here. 1179 * 1180 * It is incorrect to simply unp_discard each entry for f_msgcount 1181 * times -- consider the case of sockets A and B that contain 1182 * references to each other. On a last close of some other socket, 1183 * we trigger a gc since the number of outstanding rights (unp_rights) 1184 * is non-zero. If during the sweep phase the gc code un_discards, 1185 * we end up doing a (full) closef on the descriptor. A closef on A 1186 * results in the following chain. Closef calls soo_close, which 1187 * calls soclose. Soclose calls first (through the switch 1188 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1189 * returns because the previous instance had set unp_gcing, and 1190 * we return all the way back to soclose, which marks the socket 1191 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1192 * to free up the rights that are queued in messages on the socket A, 1193 * i.e., the reference on B. The sorflush calls via the dom_dispose 1194 * switch unp_dispose, which unp_scans with unp_discard. This second 1195 * instance of unp_discard just calls closef on B. 1196 * 1197 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1198 * which results in another closef on A. Unfortunately, A is already 1199 * being closed, and the descriptor has already been marked with 1200 * SS_NOFDREF, and soclose panics at this point. 1201 * 1202 * Here, we first take an extra reference to each inaccessible 1203 * descriptor. Then, we call sorflush ourself, since we know 1204 * it is a Unix domain socket anyhow. After we destroy all the 1205 * rights carried in messages, we do a last closef to get rid 1206 * of our extra reference. This is the last close, and the 1207 * unp_detach etc will shut down the socket. 1208 * 1209 * 91/09/19, bsy@cs.cmu.edu 1210 */ 1211 info.extra_ref = kmalloc(256 * sizeof(struct file *), M_FILE, M_WAITOK); 1212 info.maxindex = 256; 1213 1214 do { 1215 /* 1216 * Look for matches 1217 */ 1218 info.index = 0; 1219 allfiles_scan_exclusive(unp_gc_checkrefs, &info); 1220 1221 /* 1222 * For each FD on our hit list, do the following two things 1223 */ 1224 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) { 1225 struct file *tfp = *fpp; 1226 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) 1227 sorflush((struct socket *)(tfp->f_data)); 1228 } 1229 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) 1230 closef(*fpp, NULL); 1231 } while (info.index == info.maxindex); 1232 kfree((caddr_t)info.extra_ref, M_FILE); 1233 unp_gcing = FALSE; 1234 } 1235 1236 /* 1237 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1238 */ 1239 static int 1240 unp_gc_checkrefs(struct file *fp, void *data) 1241 { 1242 struct unp_gc_info *info = data; 1243 1244 if (fp->f_count == 0) 1245 return(0); 1246 if (info->index == info->maxindex) 1247 return(-1); 1248 1249 /* 1250 * If all refs are from msgs, and it's not marked accessible 1251 * then it must be referenced from some unreachable cycle 1252 * of (shut-down) FDs, so include it in our 1253 * list of FDs to remove 1254 */ 1255 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) { 1256 info->extra_ref[info->index++] = fp; 1257 fhold(fp); 1258 } 1259 return(0); 1260 } 1261 1262 /* 1263 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1264 */ 1265 static int 1266 unp_gc_clearmarks(struct file *fp, void *data __unused) 1267 { 1268 fp->f_flag &= ~(FMARK|FDEFER); 1269 return(0); 1270 } 1271 1272 /* 1273 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1274 */ 1275 static int 1276 unp_gc_checkmarks(struct file *fp, void *data) 1277 { 1278 struct unp_gc_info *info = data; 1279 struct socket *so; 1280 1281 /* 1282 * If the file is not open, skip it 1283 */ 1284 if (fp->f_count == 0) 1285 return(0); 1286 /* 1287 * If we already marked it as 'defer' in a 1288 * previous pass, then try process it this time 1289 * and un-mark it 1290 */ 1291 if (fp->f_flag & FDEFER) { 1292 fp->f_flag &= ~FDEFER; 1293 --info->defer; 1294 } else { 1295 /* 1296 * if it's not defered, then check if it's 1297 * already marked.. if so skip it 1298 */ 1299 if (fp->f_flag & FMARK) 1300 return(0); 1301 /* 1302 * If all references are from messages 1303 * in transit, then skip it. it's not 1304 * externally accessible. 1305 */ 1306 if (fp->f_count == fp->f_msgcount) 1307 return(0); 1308 /* 1309 * If it got this far then it must be 1310 * externally accessible. 1311 */ 1312 fp->f_flag |= FMARK; 1313 } 1314 /* 1315 * either it was defered, or it is externally 1316 * accessible and not already marked so. 1317 * Now check if it is possibly one of OUR sockets. 1318 */ 1319 if (fp->f_type != DTYPE_SOCKET || 1320 (so = (struct socket *)fp->f_data) == NULL) 1321 return(0); 1322 if (so->so_proto->pr_domain != &localdomain || 1323 !(so->so_proto->pr_flags & PR_RIGHTS)) 1324 return(0); 1325 #ifdef notdef 1326 XXX note: exclusive fp->f_spin lock held 1327 if (so->so_rcv.sb_flags & SB_LOCK) { 1328 /* 1329 * This is problematical; it's not clear 1330 * we need to wait for the sockbuf to be 1331 * unlocked (on a uniprocessor, at least), 1332 * and it's also not clear what to do 1333 * if sbwait returns an error due to receipt 1334 * of a signal. If sbwait does return 1335 * an error, we'll go into an infinite 1336 * loop. Delete all of this for now. 1337 */ 1338 sbwait(&so->so_rcv); 1339 goto restart; 1340 } 1341 #endif 1342 /* 1343 * So, Ok, it's one of our sockets and it IS externally 1344 * accessible (or was defered). Now we look 1345 * to see if we hold any file descriptors in its 1346 * message buffers. Follow those links and mark them 1347 * as accessible too. 1348 */ 1349 info->locked_fp = fp; 1350 /* spin_lock_wr(&so->so_rcv.sb_spin); */ 1351 unp_scan(so->so_rcv.ssb_mb, unp_mark, info); 1352 /* spin_unlock_wr(&so->so_rcv.sb_spin);*/ 1353 return (0); 1354 } 1355 1356 void 1357 unp_dispose(struct mbuf *m) 1358 { 1359 if (m) 1360 unp_scan(m, unp_discard, NULL); 1361 } 1362 1363 static int 1364 unp_listen(struct unpcb *unp, struct thread *td) 1365 { 1366 struct proc *p = td->td_proc; 1367 1368 KKASSERT(p); 1369 cru2x(p->p_ucred, &unp->unp_peercred); 1370 unp->unp_flags |= UNP_HAVEPCCACHED; 1371 return (0); 1372 } 1373 1374 static void 1375 unp_scan(struct mbuf *m0, void (*op)(struct file *, void *), void *data) 1376 { 1377 struct mbuf *m; 1378 struct file **rp; 1379 struct cmsghdr *cm; 1380 int i; 1381 int qfds; 1382 1383 while (m0) { 1384 for (m = m0; m; m = m->m_next) { 1385 if (m->m_type == MT_CONTROL && 1386 m->m_len >= sizeof(*cm)) { 1387 cm = mtod(m, struct cmsghdr *); 1388 if (cm->cmsg_level != SOL_SOCKET || 1389 cm->cmsg_type != SCM_RIGHTS) 1390 continue; 1391 qfds = (cm->cmsg_len - 1392 (CMSG_DATA(cm) - (u_char *)cm)) 1393 / sizeof (struct file *); 1394 rp = (struct file **)CMSG_DATA(cm); 1395 for (i = 0; i < qfds; i++) 1396 (*op)(*rp++, data); 1397 break; /* XXX, but saves time */ 1398 } 1399 } 1400 m0 = m0->m_nextpkt; 1401 } 1402 } 1403 1404 static void 1405 unp_mark(struct file *fp, void *data) 1406 { 1407 struct unp_gc_info *info = data; 1408 1409 if (info->locked_fp != fp) 1410 spin_lock_wr(&fp->f_spin); 1411 if ((fp->f_flag & FMARK) == 0) { 1412 ++info->defer; 1413 fp->f_flag |= (FMARK|FDEFER); 1414 } 1415 if (info->locked_fp != fp) 1416 spin_unlock_wr(&fp->f_spin); 1417 } 1418 1419 static void 1420 unp_discard(struct file *fp, void *data __unused) 1421 { 1422 spin_lock_wr(&unp_spin); 1423 fp->f_msgcount--; 1424 unp_rights--; 1425 spin_unlock_wr(&unp_spin); 1426 closef(fp, NULL); 1427 } 1428 1429