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/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/fcntl.h> 41 #include <sys/domain.h> 42 #include <sys/filedesc.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 45 #include <sys/file.h> 46 #include <sys/mutex.h> 47 #include <sys/mbuf.h> 48 #include <sys/namei.h> 49 #include <sys/proc.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/resourcevar.h> 54 #include <sys/stat.h> 55 #include <sys/sysctl.h> 56 #include <sys/un.h> 57 #include <sys/unpcb.h> 58 #include <sys/vnode.h> 59 #include <sys/jail.h> 60 #include <sys/sx.h> 61 62 #include <vm/uma.h> 63 64 static uma_zone_t 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 *); 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 *, 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 void unp_scan(struct mbuf *, void (*)(struct file *)); 91 static void unp_mark(struct file *); 92 static void unp_discard(struct file *); 93 static void unp_freerights(struct file **, int); 94 static int unp_internalize(struct mbuf **, struct thread *); 95 static int unp_listen(struct unpcb *, struct thread *); 96 97 static int 98 uipc_abort(struct socket *so) 99 { 100 struct unpcb *unp = sotounpcb(so); 101 102 if (unp == 0) 103 return EINVAL; 104 unp_drop(unp, ECONNABORTED); 105 unp_detach(unp); 106 sotryfree(so); 107 return 0; 108 } 109 110 static int 111 uipc_accept(struct socket *so, struct sockaddr **nam) 112 { 113 struct unpcb *unp = sotounpcb(so); 114 115 if (unp == 0) 116 return EINVAL; 117 118 /* 119 * Pass back name of connected socket, 120 * if it was bound and we are still connected 121 * (our peer may have closed already!). 122 */ 123 if (unp->unp_conn && unp->unp_conn->unp_addr) { 124 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 125 1); 126 } else { 127 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 128 } 129 return 0; 130 } 131 132 static int 133 uipc_attach(struct socket *so, int proto, struct thread *td) 134 { 135 struct unpcb *unp = sotounpcb(so); 136 137 if (unp != 0) 138 return EISCONN; 139 return unp_attach(so); 140 } 141 142 static int 143 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 144 { 145 struct unpcb *unp = sotounpcb(so); 146 147 if (unp == 0) 148 return EINVAL; 149 150 return unp_bind(unp, nam, td); 151 } 152 153 static int 154 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 155 { 156 struct unpcb *unp = sotounpcb(so); 157 158 if (unp == 0) 159 return EINVAL; 160 return unp_connect(so, nam, curthread); 161 } 162 163 static int 164 uipc_connect2(struct socket *so1, struct socket *so2) 165 { 166 struct unpcb *unp = sotounpcb(so1); 167 168 if (unp == 0) 169 return EINVAL; 170 171 return unp_connect2(so1, so2); 172 } 173 174 /* control is EOPNOTSUPP */ 175 176 static int 177 uipc_detach(struct socket *so) 178 { 179 struct unpcb *unp = sotounpcb(so); 180 181 if (unp == 0) 182 return EINVAL; 183 184 unp_detach(unp); 185 return 0; 186 } 187 188 static int 189 uipc_disconnect(struct socket *so) 190 { 191 struct unpcb *unp = sotounpcb(so); 192 193 if (unp == 0) 194 return EINVAL; 195 unp_disconnect(unp); 196 return 0; 197 } 198 199 static int 200 uipc_listen(struct socket *so, struct thread *td) 201 { 202 struct unpcb *unp = sotounpcb(so); 203 204 if (unp == 0 || unp->unp_vnode == 0) 205 return EINVAL; 206 return unp_listen(unp, td); 207 } 208 209 static int 210 uipc_peeraddr(struct socket *so, struct sockaddr **nam) 211 { 212 struct unpcb *unp = sotounpcb(so); 213 214 if (unp == 0) 215 return EINVAL; 216 if (unp->unp_conn && unp->unp_conn->unp_addr) 217 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr, 218 1); 219 return 0; 220 } 221 222 static int 223 uipc_rcvd(struct socket *so, int flags) 224 { 225 struct unpcb *unp = sotounpcb(so); 226 struct socket *so2; 227 u_long newhiwat; 228 229 if (unp == 0) 230 return EINVAL; 231 switch (so->so_type) { 232 case SOCK_DGRAM: 233 panic("uipc_rcvd DGRAM?"); 234 /*NOTREACHED*/ 235 236 case SOCK_STREAM: 237 if (unp->unp_conn == 0) 238 break; 239 so2 = unp->unp_conn->unp_socket; 240 /* 241 * Adjust backpressure on sender 242 * and wakeup any waiting to write. 243 */ 244 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt; 245 unp->unp_mbcnt = so->so_rcv.sb_mbcnt; 246 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - 247 so->so_rcv.sb_cc; 248 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat, 249 newhiwat, RLIM_INFINITY); 250 unp->unp_cc = so->so_rcv.sb_cc; 251 sowwakeup(so2); 252 break; 253 254 default: 255 panic("uipc_rcvd unknown socktype"); 256 } 257 return 0; 258 } 259 260 /* pru_rcvoob is EOPNOTSUPP */ 261 262 static int 263 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 264 struct mbuf *control, struct thread *td) 265 { 266 int error = 0; 267 struct unpcb *unp = sotounpcb(so); 268 struct socket *so2; 269 u_long newhiwat; 270 271 if (unp == 0) { 272 error = EINVAL; 273 goto release; 274 } 275 if (flags & PRUS_OOB) { 276 error = EOPNOTSUPP; 277 goto release; 278 } 279 280 if (control && (error = unp_internalize(&control, td))) 281 goto release; 282 283 switch (so->so_type) { 284 case SOCK_DGRAM: 285 { 286 struct sockaddr *from; 287 288 if (nam) { 289 if (unp->unp_conn) { 290 error = EISCONN; 291 break; 292 } 293 error = unp_connect(so, nam, td); 294 if (error) 295 break; 296 } else { 297 if (unp->unp_conn == 0) { 298 error = ENOTCONN; 299 break; 300 } 301 } 302 so2 = unp->unp_conn->unp_socket; 303 if (unp->unp_addr) 304 from = (struct sockaddr *)unp->unp_addr; 305 else 306 from = &sun_noname; 307 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 308 sorwakeup(so2); 309 m = 0; 310 control = 0; 311 } else 312 error = ENOBUFS; 313 if (nam) 314 unp_disconnect(unp); 315 break; 316 } 317 318 case SOCK_STREAM: 319 /* Connect if not connected yet. */ 320 /* 321 * Note: A better implementation would complain 322 * if not equal to the peer's address. 323 */ 324 if ((so->so_state & SS_ISCONNECTED) == 0) { 325 if (nam) { 326 error = unp_connect(so, nam, td); 327 if (error) 328 break; /* XXX */ 329 } else { 330 error = ENOTCONN; 331 break; 332 } 333 } 334 335 if (so->so_state & SS_CANTSENDMORE) { 336 error = EPIPE; 337 break; 338 } 339 if (unp->unp_conn == 0) 340 panic("uipc_send connected but no connection?"); 341 so2 = unp->unp_conn->unp_socket; 342 /* 343 * Send to paired receive port, and then reduce 344 * send buffer hiwater marks to maintain backpressure. 345 * Wake up readers. 346 */ 347 if (control) { 348 if (sbappendcontrol(&so2->so_rcv, m, control)) 349 control = 0; 350 } else 351 sbappend(&so2->so_rcv, m); 352 so->so_snd.sb_mbmax -= 353 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt; 354 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt; 355 newhiwat = so->so_snd.sb_hiwat - 356 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc); 357 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat, 358 newhiwat, RLIM_INFINITY); 359 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc; 360 sorwakeup(so2); 361 m = 0; 362 break; 363 364 default: 365 panic("uipc_send unknown socktype"); 366 } 367 368 /* 369 * SEND_EOF is equivalent to a SEND followed by 370 * a SHUTDOWN. 371 */ 372 if (flags & PRUS_EOF) { 373 socantsendmore(so); 374 unp_shutdown(unp); 375 } 376 377 if (control && error != 0) 378 unp_dispose(control); 379 380 release: 381 if (control) 382 m_freem(control); 383 if (m) 384 m_freem(m); 385 return error; 386 } 387 388 static int 389 uipc_sense(struct socket *so, struct stat *sb) 390 { 391 struct unpcb *unp = sotounpcb(so); 392 struct socket *so2; 393 394 if (unp == 0) 395 return EINVAL; 396 sb->st_blksize = so->so_snd.sb_hiwat; 397 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 398 so2 = unp->unp_conn->unp_socket; 399 sb->st_blksize += so2->so_rcv.sb_cc; 400 } 401 sb->st_dev = NOUDEV; 402 if (unp->unp_ino == 0) 403 unp->unp_ino = unp_ino++; 404 sb->st_ino = unp->unp_ino; 405 return (0); 406 } 407 408 static int 409 uipc_shutdown(struct socket *so) 410 { 411 struct unpcb *unp = sotounpcb(so); 412 413 if (unp == 0) 414 return EINVAL; 415 socantsendmore(so); 416 unp_shutdown(unp); 417 return 0; 418 } 419 420 static int 421 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 422 { 423 struct unpcb *unp = sotounpcb(so); 424 425 if (unp == 0) 426 return EINVAL; 427 if (unp->unp_addr) 428 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1); 429 else 430 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1); 431 return 0; 432 } 433 434 struct pr_usrreqs uipc_usrreqs = { 435 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect, 436 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect, 437 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp, 438 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr, 439 sosend, soreceive, sopoll 440 }; 441 442 int 443 uipc_ctloutput(so, sopt) 444 struct socket *so; 445 struct sockopt *sopt; 446 { 447 struct unpcb *unp = sotounpcb(so); 448 int error; 449 450 switch (sopt->sopt_dir) { 451 case SOPT_GET: 452 switch (sopt->sopt_name) { 453 case LOCAL_PEERCRED: 454 if (unp->unp_flags & UNP_HAVEPC) 455 error = sooptcopyout(sopt, &unp->unp_peercred, 456 sizeof(unp->unp_peercred)); 457 else { 458 if (so->so_type == SOCK_STREAM) 459 error = ENOTCONN; 460 else 461 error = EINVAL; 462 } 463 break; 464 default: 465 error = EOPNOTSUPP; 466 break; 467 } 468 break; 469 case SOPT_SET: 470 default: 471 error = EOPNOTSUPP; 472 break; 473 } 474 return (error); 475 } 476 477 /* 478 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 479 * for stream sockets, although the total for sender and receiver is 480 * actually only PIPSIZ. 481 * Datagram sockets really use the sendspace as the maximum datagram size, 482 * and don't really want to reserve the sendspace. Their recvspace should 483 * be large enough for at least one max-size datagram plus address. 484 */ 485 #ifndef PIPSIZ 486 #define PIPSIZ 8192 487 #endif 488 static u_long unpst_sendspace = PIPSIZ; 489 static u_long unpst_recvspace = PIPSIZ; 490 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 491 static u_long unpdg_recvspace = 4*1024; 492 493 static int unp_rights; /* file descriptors in flight */ 494 495 SYSCTL_DECL(_net_local_stream); 496 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 497 &unpst_sendspace, 0, ""); 498 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 499 &unpst_recvspace, 0, ""); 500 SYSCTL_DECL(_net_local_dgram); 501 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 502 &unpdg_sendspace, 0, ""); 503 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 504 &unpdg_recvspace, 0, ""); 505 SYSCTL_DECL(_net_local); 506 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, ""); 507 508 static int 509 unp_attach(so) 510 struct socket *so; 511 { 512 register struct unpcb *unp; 513 int error; 514 515 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 516 switch (so->so_type) { 517 518 case SOCK_STREAM: 519 error = soreserve(so, unpst_sendspace, unpst_recvspace); 520 break; 521 522 case SOCK_DGRAM: 523 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 524 break; 525 526 default: 527 panic("unp_attach"); 528 } 529 if (error) 530 return (error); 531 } 532 unp = uma_zalloc(unp_zone, M_WAITOK); 533 if (unp == NULL) 534 return (ENOBUFS); 535 bzero(unp, sizeof *unp); 536 unp->unp_gencnt = ++unp_gencnt; 537 unp_count++; 538 LIST_INIT(&unp->unp_refs); 539 unp->unp_socket = so; 540 FILEDESC_LOCK(curproc->p_fd); 541 unp->unp_rvnode = curthread->td_proc->p_fd->fd_rdir; 542 FILEDESC_UNLOCK(curproc->p_fd); 543 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead 544 : &unp_shead, unp, unp_link); 545 so->so_pcb = (caddr_t)unp; 546 return (0); 547 } 548 549 static void 550 unp_detach(unp) 551 register struct unpcb *unp; 552 { 553 LIST_REMOVE(unp, unp_link); 554 unp->unp_gencnt = ++unp_gencnt; 555 --unp_count; 556 if (unp->unp_vnode) { 557 unp->unp_vnode->v_socket = 0; 558 vrele(unp->unp_vnode); 559 unp->unp_vnode = 0; 560 } 561 if (unp->unp_conn) 562 unp_disconnect(unp); 563 while (!LIST_EMPTY(&unp->unp_refs)) 564 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET); 565 soisdisconnected(unp->unp_socket); 566 unp->unp_socket->so_pcb = 0; 567 if (unp_rights) { 568 /* 569 * Normally the receive buffer is flushed later, 570 * in sofree, but if our receive buffer holds references 571 * to descriptors that are now garbage, we will dispose 572 * of those descriptor references after the garbage collector 573 * gets them (resulting in a "panic: closef: count < 0"). 574 */ 575 sorflush(unp->unp_socket); 576 unp_gc(); 577 } 578 if (unp->unp_addr) 579 FREE(unp->unp_addr, M_SONAME); 580 uma_zfree(unp_zone, unp); 581 } 582 583 static int 584 unp_bind(unp, nam, td) 585 struct unpcb *unp; 586 struct sockaddr *nam; 587 struct thread *td; 588 { 589 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 590 struct vnode *vp; 591 struct mount *mp; 592 struct vattr vattr; 593 int error, namelen; 594 struct nameidata nd; 595 char *buf; 596 597 if (unp->unp_vnode != NULL) 598 return (EINVAL); 599 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 600 if (namelen <= 0) 601 return EINVAL; 602 buf = malloc(SOCK_MAXADDRLEN, M_TEMP, M_WAITOK); 603 strncpy(buf, soun->sun_path, namelen); 604 buf[namelen] = 0; /* null-terminate the string */ 605 restart: 606 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT, UIO_SYSSPACE, 607 buf, td); 608 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 609 error = namei(&nd); 610 if (error) { 611 free(buf, M_TEMP); 612 return (error); 613 } 614 vp = nd.ni_vp; 615 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 616 NDFREE(&nd, NDF_ONLY_PNBUF); 617 if (nd.ni_dvp == vp) 618 vrele(nd.ni_dvp); 619 else 620 vput(nd.ni_dvp); 621 if (vp != NULL) { 622 vrele(vp); 623 free(buf, M_TEMP); 624 return (EADDRINUSE); 625 } 626 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 627 if (error) { 628 free(buf, M_TEMP); 629 return (error); 630 } 631 goto restart; 632 } 633 VATTR_NULL(&vattr); 634 vattr.va_type = VSOCK; 635 FILEDESC_LOCK(td->td_proc->p_fd); 636 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 637 FILEDESC_UNLOCK(td->td_proc->p_fd); 638 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 639 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 640 NDFREE(&nd, NDF_ONLY_PNBUF); 641 vput(nd.ni_dvp); 642 if (error) { 643 free(buf, M_TEMP); 644 return (error); 645 } 646 vp = nd.ni_vp; 647 vp->v_socket = unp->unp_socket; 648 unp->unp_vnode = vp; 649 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1); 650 VOP_UNLOCK(vp, 0, td); 651 vn_finished_write(mp); 652 free(buf, M_TEMP); 653 return (0); 654 } 655 656 static int 657 unp_connect(so, nam, td) 658 struct socket *so; 659 struct sockaddr *nam; 660 struct thread *td; 661 { 662 register struct sockaddr_un *soun = (struct sockaddr_un *)nam; 663 register struct vnode *vp; 664 register struct socket *so2, *so3; 665 struct unpcb *unp, *unp2, *unp3; 666 int error, len; 667 struct nameidata nd; 668 char buf[SOCK_MAXADDRLEN]; 669 670 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 671 if (len <= 0) 672 return EINVAL; 673 strncpy(buf, soun->sun_path, len); 674 buf[len] = 0; 675 676 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td); 677 error = namei(&nd); 678 if (error) 679 return (error); 680 vp = nd.ni_vp; 681 NDFREE(&nd, NDF_ONLY_PNBUF); 682 if (vp->v_type != VSOCK) { 683 error = ENOTSOCK; 684 goto bad; 685 } 686 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 687 if (error) 688 goto bad; 689 so2 = vp->v_socket; 690 if (so2 == 0) { 691 error = ECONNREFUSED; 692 goto bad; 693 } 694 if (so->so_type != so2->so_type) { 695 error = EPROTOTYPE; 696 goto bad; 697 } 698 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 699 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 700 (so3 = sonewconn(so2, 0)) == 0) { 701 error = ECONNREFUSED; 702 goto bad; 703 } 704 unp = sotounpcb(so); 705 unp2 = sotounpcb(so2); 706 unp3 = sotounpcb(so3); 707 if (unp2->unp_addr) 708 unp3->unp_addr = (struct sockaddr_un *) 709 dup_sockaddr((struct sockaddr *) 710 unp2->unp_addr, 1); 711 712 /* 713 * unp_peercred management: 714 * 715 * The connecter's (client's) credentials are copied 716 * from its process structure at the time of connect() 717 * (which is now). 718 */ 719 cru2x(td->td_ucred, &unp3->unp_peercred); 720 unp3->unp_flags |= UNP_HAVEPC; 721 /* 722 * The receiver's (server's) credentials are copied 723 * from the unp_peercred member of socket on which the 724 * former called listen(); unp_listen() cached that 725 * process's credentials at that time so we can use 726 * them now. 727 */ 728 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 729 ("unp_connect: listener without cached peercred")); 730 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 731 sizeof(unp->unp_peercred)); 732 unp->unp_flags |= UNP_HAVEPC; 733 734 so2 = so3; 735 } 736 error = unp_connect2(so, so2); 737 bad: 738 vput(vp); 739 return (error); 740 } 741 742 int 743 unp_connect2(so, so2) 744 register struct socket *so; 745 register struct socket *so2; 746 { 747 register struct unpcb *unp = sotounpcb(so); 748 register struct unpcb *unp2; 749 750 if (so2->so_type != so->so_type) 751 return (EPROTOTYPE); 752 unp2 = sotounpcb(so2); 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 unp2->unp_conn = unp; 763 soisconnected(so); 764 soisconnected(so2); 765 break; 766 767 default: 768 panic("unp_connect2"); 769 } 770 return (0); 771 } 772 773 static void 774 unp_disconnect(unp) 775 struct unpcb *unp; 776 { 777 register struct unpcb *unp2 = unp->unp_conn; 778 779 if (unp2 == 0) 780 return; 781 unp->unp_conn = 0; 782 switch (unp->unp_socket->so_type) { 783 784 case SOCK_DGRAM: 785 LIST_REMOVE(unp, unp_reflink); 786 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 787 break; 788 789 case SOCK_STREAM: 790 soisdisconnected(unp->unp_socket); 791 unp2->unp_conn = 0; 792 soisdisconnected(unp2->unp_socket); 793 break; 794 } 795 } 796 797 #ifdef notdef 798 void 799 unp_abort(unp) 800 struct unpcb *unp; 801 { 802 803 unp_detach(unp); 804 } 805 #endif 806 807 static int 808 unp_pcblist(SYSCTL_HANDLER_ARGS) 809 { 810 int error, i, n; 811 struct unpcb *unp, **unp_list; 812 unp_gen_t gencnt; 813 struct xunpgen *xug; 814 struct unp_head *head; 815 struct xunpcb *xu; 816 817 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); 818 819 /* 820 * The process of preparing the PCB list is too time-consuming and 821 * resource-intensive to repeat twice on every request. 822 */ 823 if (req->oldptr == 0) { 824 n = unp_count; 825 req->oldidx = 2 * (sizeof *xug) 826 + (n + n/8) * sizeof(struct xunpcb); 827 return 0; 828 } 829 830 if (req->newptr != 0) 831 return EPERM; 832 833 /* 834 * OK, now we're committed to doing something. 835 */ 836 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 837 gencnt = unp_gencnt; 838 n = unp_count; 839 840 xug->xug_len = sizeof *xug; 841 xug->xug_count = n; 842 xug->xug_gen = gencnt; 843 xug->xug_sogen = so_gencnt; 844 error = SYSCTL_OUT(req, xug, sizeof *xug); 845 if (error) { 846 free(xug, M_TEMP); 847 return error; 848 } 849 850 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 851 852 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 853 unp = LIST_NEXT(unp, unp_link)) { 854 if (unp->unp_gencnt <= gencnt) { 855 if (cr_cansee(req->td->td_ucred, 856 unp->unp_socket->so_cred)) 857 continue; 858 unp_list[i++] = unp; 859 } 860 } 861 n = i; /* in case we lost some during malloc */ 862 863 error = 0; 864 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK); 865 for (i = 0; i < n; i++) { 866 unp = unp_list[i]; 867 if (unp->unp_gencnt <= gencnt) { 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 free(xu, M_TEMP); 887 if (!error) { 888 /* 889 * Give the user an updated idea of our state. 890 * If the generation differs from what we told 891 * her before, she knows that something happened 892 * while we were processing this request, and it 893 * might be necessary to retry. 894 */ 895 xug->xug_gen = unp_gencnt; 896 xug->xug_sogen = so_gencnt; 897 xug->xug_count = unp_count; 898 error = SYSCTL_OUT(req, xug, sizeof *xug); 899 } 900 free(unp_list, M_TEMP); 901 free(xug, M_TEMP); 902 return error; 903 } 904 905 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 906 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 907 "List of active local datagram sockets"); 908 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 909 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 910 "List of active local stream sockets"); 911 912 static void 913 unp_shutdown(unp) 914 struct unpcb *unp; 915 { 916 struct socket *so; 917 918 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 919 (so = unp->unp_conn->unp_socket)) 920 socantrcvmore(so); 921 } 922 923 static void 924 unp_drop(unp, errno) 925 struct unpcb *unp; 926 int errno; 927 { 928 struct socket *so = unp->unp_socket; 929 930 so->so_error = errno; 931 unp_disconnect(unp); 932 } 933 934 #ifdef notdef 935 void 936 unp_drain() 937 { 938 939 } 940 #endif 941 942 static void 943 unp_freerights(rp, fdcount) 944 struct file **rp; 945 int fdcount; 946 { 947 int i; 948 struct file *fp; 949 950 for (i = 0; i < fdcount; i++) { 951 fp = *rp; 952 /* 953 * zero the pointer before calling 954 * unp_discard since it may end up 955 * in unp_gc().. 956 */ 957 *rp++ = 0; 958 unp_discard(fp); 959 } 960 } 961 962 int 963 unp_externalize(control, controlp) 964 struct mbuf *control, **controlp; 965 { 966 struct thread *td = curthread; /* XXX */ 967 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 968 int i; 969 int *fdp; 970 struct file **rp; 971 struct file *fp; 972 void *data; 973 socklen_t clen = control->m_len, datalen; 974 int error, newfds; 975 int f; 976 u_int newlen; 977 978 error = 0; 979 if (controlp != NULL) /* controlp == NULL => free control messages */ 980 *controlp = NULL; 981 982 while (cm != NULL) { 983 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 984 error = EINVAL; 985 break; 986 } 987 988 data = CMSG_DATA(cm); 989 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 990 991 if (cm->cmsg_level == SOL_SOCKET 992 && cm->cmsg_type == SCM_RIGHTS) { 993 newfds = datalen / sizeof(struct file *); 994 rp = data; 995 996 /* If we're not outputting the discriptors free them. */ 997 if (error || controlp == NULL) { 998 unp_freerights(rp, newfds); 999 goto next; 1000 } 1001 FILEDESC_LOCK(td->td_proc->p_fd); 1002 /* if the new FD's will not fit free them. */ 1003 if (!fdavail(td, newfds)) { 1004 FILEDESC_UNLOCK(td->td_proc->p_fd); 1005 error = EMSGSIZE; 1006 unp_freerights(rp, newfds); 1007 goto next; 1008 } 1009 /* 1010 * now change each pointer to an fd in the global 1011 * table to an integer that is the index to the 1012 * local fd table entry that we set up to point 1013 * to the global one we are transferring. 1014 */ 1015 newlen = newfds * sizeof(int); 1016 *controlp = sbcreatecontrol(NULL, newlen, 1017 SCM_RIGHTS, SOL_SOCKET); 1018 if (*controlp == NULL) { 1019 FILEDESC_UNLOCK(td->td_proc->p_fd); 1020 error = E2BIG; 1021 unp_freerights(rp, newfds); 1022 goto next; 1023 } 1024 1025 fdp = (int *) 1026 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1027 for (i = 0; i < newfds; i++) { 1028 if (fdalloc(td, 0, &f)) 1029 panic("unp_externalize fdalloc failed"); 1030 fp = *rp++; 1031 td->td_proc->p_fd->fd_ofiles[f] = fp; 1032 FILE_LOCK(fp); 1033 fp->f_msgcount--; 1034 FILE_UNLOCK(fp); 1035 unp_rights--; 1036 *fdp++ = f; 1037 } 1038 FILEDESC_UNLOCK(td->td_proc->p_fd); 1039 } else { /* We can just copy anything else across */ 1040 if (error || controlp == NULL) 1041 goto next; 1042 *controlp = sbcreatecontrol(NULL, datalen, 1043 cm->cmsg_type, cm->cmsg_level); 1044 if (*controlp == NULL) { 1045 error = ENOBUFS; 1046 goto next; 1047 } 1048 bcopy(data, 1049 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1050 datalen); 1051 } 1052 1053 controlp = &(*controlp)->m_next; 1054 1055 next: 1056 if (CMSG_SPACE(datalen) < clen) { 1057 clen -= CMSG_SPACE(datalen); 1058 cm = (struct cmsghdr *) 1059 ((caddr_t)cm + CMSG_SPACE(datalen)); 1060 } else { 1061 clen = 0; 1062 cm = NULL; 1063 } 1064 } 1065 1066 m_freem(control); 1067 1068 return (error); 1069 } 1070 1071 void 1072 unp_init(void) 1073 { 1074 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1075 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1076 uma_zone_set_max(unp_zone, nmbclusters); 1077 if (unp_zone == 0) 1078 panic("unp_init"); 1079 LIST_INIT(&unp_dhead); 1080 LIST_INIT(&unp_shead); 1081 } 1082 1083 #ifndef MIN 1084 #define MIN(a,b) (((a)<(b))?(a):(b)) 1085 #endif 1086 1087 static int 1088 unp_internalize(controlp, td) 1089 struct mbuf **controlp; 1090 struct thread *td; 1091 { 1092 struct mbuf *control = *controlp; 1093 struct proc *p = td->td_proc; 1094 struct filedesc *fdescp = p->p_fd; 1095 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1096 struct cmsgcred *cmcred; 1097 struct file **rp; 1098 struct file *fp; 1099 struct timeval *tv; 1100 int i, fd, *fdp; 1101 void *data; 1102 socklen_t clen = control->m_len, datalen; 1103 int error, oldfds; 1104 u_int newlen; 1105 1106 error = 0; 1107 *controlp = NULL; 1108 1109 while (cm != NULL) { 1110 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1111 || cm->cmsg_len > clen) { 1112 error = EINVAL; 1113 goto out; 1114 } 1115 1116 data = CMSG_DATA(cm); 1117 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1118 1119 switch (cm->cmsg_type) { 1120 /* 1121 * Fill in credential information. 1122 */ 1123 case SCM_CREDS: 1124 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1125 SCM_CREDS, SOL_SOCKET); 1126 if (*controlp == NULL) { 1127 error = ENOBUFS; 1128 goto out; 1129 } 1130 1131 cmcred = (struct cmsgcred *) 1132 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1133 cmcred->cmcred_pid = p->p_pid; 1134 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1135 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1136 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1137 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1138 CMGROUP_MAX); 1139 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1140 cmcred->cmcred_groups[i] = 1141 td->td_ucred->cr_groups[i]; 1142 break; 1143 1144 case SCM_RIGHTS: 1145 oldfds = datalen / sizeof (int); 1146 /* 1147 * check that all the FDs passed in refer to legal files 1148 * If not, reject the entire operation. 1149 */ 1150 fdp = data; 1151 FILEDESC_LOCK(fdescp); 1152 for (i = 0; i < oldfds; i++) { 1153 fd = *fdp++; 1154 if ((unsigned)fd >= fdescp->fd_nfiles || 1155 fdescp->fd_ofiles[fd] == NULL) { 1156 FILEDESC_UNLOCK(fdescp); 1157 error = EBADF; 1158 goto out; 1159 } 1160 } 1161 /* 1162 * Now replace the integer FDs with pointers to 1163 * the associated global file table entry.. 1164 */ 1165 newlen = oldfds * sizeof(struct file *); 1166 *controlp = sbcreatecontrol(NULL, newlen, 1167 SCM_RIGHTS, SOL_SOCKET); 1168 if (*controlp == NULL) { 1169 FILEDESC_UNLOCK(fdescp); 1170 error = E2BIG; 1171 goto out; 1172 } 1173 1174 fdp = data; 1175 rp = (struct file **) 1176 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1177 for (i = 0; i < oldfds; i++) { 1178 fp = fdescp->fd_ofiles[*fdp++]; 1179 *rp++ = fp; 1180 FILE_LOCK(fp); 1181 fp->f_count++; 1182 fp->f_msgcount++; 1183 FILE_UNLOCK(fp); 1184 unp_rights++; 1185 } 1186 FILEDESC_UNLOCK(fdescp); 1187 break; 1188 1189 case SCM_TIMESTAMP: 1190 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 1191 SCM_TIMESTAMP, SOL_SOCKET); 1192 if (*controlp == NULL) { 1193 error = ENOBUFS; 1194 goto out; 1195 } 1196 tv = (struct timeval *) 1197 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1198 microtime(tv); 1199 break; 1200 1201 default: 1202 error = EINVAL; 1203 goto out; 1204 } 1205 1206 controlp = &(*controlp)->m_next; 1207 1208 if (CMSG_SPACE(datalen) < clen) { 1209 clen -= CMSG_SPACE(datalen); 1210 cm = (struct cmsghdr *) 1211 ((caddr_t)cm + CMSG_SPACE(datalen)); 1212 } else { 1213 clen = 0; 1214 cm = NULL; 1215 } 1216 } 1217 1218 out: 1219 m_freem(control); 1220 1221 return (error); 1222 } 1223 1224 static int unp_defer, unp_gcing; 1225 1226 static void 1227 unp_gc() 1228 { 1229 register struct file *fp, *nextfp; 1230 register struct socket *so; 1231 struct file **extra_ref, **fpp; 1232 int nunref, i; 1233 1234 if (unp_gcing) 1235 return; 1236 unp_gcing = 1; 1237 unp_defer = 0; 1238 /* 1239 * before going through all this, set all FDs to 1240 * be NOT defered and NOT externally accessible 1241 */ 1242 sx_slock(&filelist_lock); 1243 LIST_FOREACH(fp, &filehead, f_list) 1244 fp->f_gcflag &= ~(FMARK|FDEFER); 1245 do { 1246 LIST_FOREACH(fp, &filehead, f_list) { 1247 FILE_LOCK(fp); 1248 /* 1249 * If the file is not open, skip it 1250 */ 1251 if (fp->f_count == 0) { 1252 FILE_UNLOCK(fp); 1253 continue; 1254 } 1255 /* 1256 * If we already marked it as 'defer' in a 1257 * previous pass, then try process it this time 1258 * and un-mark it 1259 */ 1260 if (fp->f_gcflag & FDEFER) { 1261 fp->f_gcflag &= ~FDEFER; 1262 unp_defer--; 1263 } else { 1264 /* 1265 * if it's not defered, then check if it's 1266 * already marked.. if so skip it 1267 */ 1268 if (fp->f_gcflag & FMARK) { 1269 FILE_UNLOCK(fp); 1270 continue; 1271 } 1272 /* 1273 * If all references are from messages 1274 * in transit, then skip it. it's not 1275 * externally accessible. 1276 */ 1277 if (fp->f_count == fp->f_msgcount) { 1278 FILE_UNLOCK(fp); 1279 continue; 1280 } 1281 /* 1282 * If it got this far then it must be 1283 * externally accessible. 1284 */ 1285 fp->f_gcflag |= FMARK; 1286 } 1287 /* 1288 * either it was defered, or it is externally 1289 * accessible and not already marked so. 1290 * Now check if it is possibly one of OUR sockets. 1291 */ 1292 if (fp->f_type != DTYPE_SOCKET || 1293 (so = (struct socket *)fp->f_data) == 0) { 1294 FILE_UNLOCK(fp); 1295 continue; 1296 } 1297 FILE_UNLOCK(fp); 1298 if (so->so_proto->pr_domain != &localdomain || 1299 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 1300 continue; 1301 #ifdef notdef 1302 if (so->so_rcv.sb_flags & SB_LOCK) { 1303 /* 1304 * This is problematical; it's not clear 1305 * we need to wait for the sockbuf to be 1306 * unlocked (on a uniprocessor, at least), 1307 * and it's also not clear what to do 1308 * if sbwait returns an error due to receipt 1309 * of a signal. If sbwait does return 1310 * an error, we'll go into an infinite 1311 * loop. Delete all of this for now. 1312 */ 1313 (void) sbwait(&so->so_rcv); 1314 goto restart; 1315 } 1316 #endif 1317 /* 1318 * So, Ok, it's one of our sockets and it IS externally 1319 * accessible (or was defered). Now we look 1320 * to see if we hold any file descriptors in its 1321 * message buffers. Follow those links and mark them 1322 * as accessible too. 1323 */ 1324 unp_scan(so->so_rcv.sb_mb, unp_mark); 1325 } 1326 } while (unp_defer); 1327 sx_sunlock(&filelist_lock); 1328 /* 1329 * We grab an extra reference to each of the file table entries 1330 * that are not otherwise accessible and then free the rights 1331 * that are stored in messages on them. 1332 * 1333 * The bug in the orginal code is a little tricky, so I'll describe 1334 * what's wrong with it here. 1335 * 1336 * It is incorrect to simply unp_discard each entry for f_msgcount 1337 * times -- consider the case of sockets A and B that contain 1338 * references to each other. On a last close of some other socket, 1339 * we trigger a gc since the number of outstanding rights (unp_rights) 1340 * is non-zero. If during the sweep phase the gc code un_discards, 1341 * we end up doing a (full) closef on the descriptor. A closef on A 1342 * results in the following chain. Closef calls soo_close, which 1343 * calls soclose. Soclose calls first (through the switch 1344 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1345 * returns because the previous instance had set unp_gcing, and 1346 * we return all the way back to soclose, which marks the socket 1347 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1348 * to free up the rights that are queued in messages on the socket A, 1349 * i.e., the reference on B. The sorflush calls via the dom_dispose 1350 * switch unp_dispose, which unp_scans with unp_discard. This second 1351 * instance of unp_discard just calls closef on B. 1352 * 1353 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1354 * which results in another closef on A. Unfortunately, A is already 1355 * being closed, and the descriptor has already been marked with 1356 * SS_NOFDREF, and soclose panics at this point. 1357 * 1358 * Here, we first take an extra reference to each inaccessible 1359 * descriptor. Then, we call sorflush ourself, since we know 1360 * it is a Unix domain socket anyhow. After we destroy all the 1361 * rights carried in messages, we do a last closef to get rid 1362 * of our extra reference. This is the last close, and the 1363 * unp_detach etc will shut down the socket. 1364 * 1365 * 91/09/19, bsy@cs.cmu.edu 1366 */ 1367 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK); 1368 sx_slock(&filelist_lock); 1369 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0; 1370 fp = nextfp) { 1371 nextfp = LIST_NEXT(fp, f_list); 1372 FILE_LOCK(fp); 1373 /* 1374 * If it's not open, skip it 1375 */ 1376 if (fp->f_count == 0) { 1377 FILE_UNLOCK(fp); 1378 continue; 1379 } 1380 /* 1381 * If all refs are from msgs, and it's not marked accessible 1382 * then it must be referenced from some unreachable cycle 1383 * of (shut-down) FDs, so include it in our 1384 * list of FDs to remove 1385 */ 1386 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) { 1387 *fpp++ = fp; 1388 nunref++; 1389 fp->f_count++; 1390 } 1391 FILE_UNLOCK(fp); 1392 } 1393 sx_sunlock(&filelist_lock); 1394 /* 1395 * for each FD on our hit list, do the following two things 1396 */ 1397 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { 1398 struct file *tfp = *fpp; 1399 FILE_LOCK(tfp); 1400 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) { 1401 FILE_UNLOCK(tfp); 1402 sorflush((struct socket *)(tfp->f_data)); 1403 } else 1404 FILE_UNLOCK(tfp); 1405 } 1406 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) 1407 closef(*fpp, (struct thread *) NULL); 1408 free((caddr_t)extra_ref, M_TEMP); 1409 unp_gcing = 0; 1410 } 1411 1412 void 1413 unp_dispose(m) 1414 struct mbuf *m; 1415 { 1416 1417 if (m) 1418 unp_scan(m, unp_discard); 1419 } 1420 1421 static int 1422 unp_listen(unp, td) 1423 struct unpcb *unp; 1424 struct thread *td; 1425 { 1426 1427 cru2x(td->td_ucred, &unp->unp_peercred); 1428 unp->unp_flags |= UNP_HAVEPCCACHED; 1429 return (0); 1430 } 1431 1432 static void 1433 unp_scan(m0, op) 1434 register struct mbuf *m0; 1435 void (*op)(struct file *); 1436 { 1437 struct mbuf *m; 1438 struct file **rp; 1439 struct cmsghdr *cm; 1440 void *data; 1441 int i; 1442 socklen_t clen, datalen; 1443 int qfds; 1444 1445 while (m0) { 1446 for (m = m0; m; m = m->m_next) { 1447 if (m->m_type != MT_CONTROL) 1448 continue; 1449 1450 cm = mtod(m, struct cmsghdr *); 1451 clen = m->m_len; 1452 1453 while (cm != NULL) { 1454 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 1455 break; 1456 1457 data = CMSG_DATA(cm); 1458 datalen = (caddr_t)cm + cm->cmsg_len 1459 - (caddr_t)data; 1460 1461 if (cm->cmsg_level == SOL_SOCKET && 1462 cm->cmsg_type == SCM_RIGHTS) { 1463 qfds = datalen / sizeof (struct file *); 1464 rp = data; 1465 for (i = 0; i < qfds; i++) 1466 (*op)(*rp++); 1467 } 1468 1469 if (CMSG_SPACE(datalen) < clen) { 1470 clen -= CMSG_SPACE(datalen); 1471 cm = (struct cmsghdr *) 1472 ((caddr_t)cm + CMSG_SPACE(datalen)); 1473 } else { 1474 clen = 0; 1475 cm = NULL; 1476 } 1477 } 1478 } 1479 m0 = m0->m_act; 1480 } 1481 } 1482 1483 static void 1484 unp_mark(fp) 1485 struct file *fp; 1486 { 1487 if (fp->f_gcflag & FMARK) 1488 return; 1489 unp_defer++; 1490 fp->f_gcflag |= (FMARK|FDEFER); 1491 } 1492 1493 static void 1494 unp_discard(fp) 1495 struct file *fp; 1496 { 1497 FILE_LOCK(fp); 1498 fp->f_msgcount--; 1499 unp_rights--; 1500 FILE_UNLOCK(fp); 1501 (void) closef(fp, (struct thread *)NULL); 1502 } 1503