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