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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94 30 * $FreeBSD: src/sys/kern/uipc_usrreq.c,v 1.54.2.10 2003/03/04 17:28:09 nectar Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/domain.h> 37 #include <sys/fcntl.h> 38 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 39 #include <sys/proc.h> 40 #include <sys/file.h> 41 #include <sys/filedesc.h> 42 #include <sys/mbuf.h> 43 #include <sys/nlookup.h> 44 #include <sys/protosw.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/resourcevar.h> 48 #include <sys/stat.h> 49 #include <sys/mount.h> 50 #include <sys/sysctl.h> 51 #include <sys/un.h> 52 #include <sys/unpcb.h> 53 #include <sys/vnode.h> 54 #include <sys/kern_syscall.h> 55 #include <sys/taskqueue.h> 56 57 #include <sys/file2.h> 58 #include <sys/spinlock2.h> 59 #include <sys/socketvar2.h> 60 #include <sys/msgport2.h> 61 62 #define UNP_DETACHED UNP_PRIVATE1 63 #define UNP_CONNECTING UNP_PRIVATE2 64 #define UNP_DROPPED UNP_PRIVATE3 65 #define UNP_MARKER UNP_PRIVATE4 66 67 /* For unp_internalize() and unp_externalize() */ 68 CTASSERT(sizeof(struct file *) >= sizeof(int)); 69 70 #define UNP_ISATTACHED(unp) \ 71 ((unp) != NULL && ((unp)->unp_flags & UNP_DETACHED) == 0) 72 73 #ifdef INVARIANTS 74 #define UNP_ASSERT_TOKEN_HELD(unp) \ 75 ASSERT_LWKT_TOKEN_HELD(lwkt_token_pool_lookup((unp))) 76 #else /* !INVARIANTS */ 77 #define UNP_ASSERT_TOKEN_HELD(unp) 78 #endif /* INVARIANTS */ 79 80 struct unp_defdiscard { 81 SLIST_ENTRY(unp_defdiscard) next; 82 struct file *fp; 83 }; 84 SLIST_HEAD(unp_defdiscard_list, unp_defdiscard); 85 86 TAILQ_HEAD(unpcb_qhead, unpcb); 87 struct unp_global_head { 88 struct unpcb_qhead list; 89 int count; 90 }; 91 92 static MALLOC_DEFINE(M_UNPCB, "unpcb", "unpcb struct"); 93 static unp_gen_t unp_gencnt; 94 95 static struct unp_global_head unp_stream_head; 96 static struct unp_global_head unp_dgram_head; 97 static struct unp_global_head unp_seqpkt_head; 98 99 static struct lwkt_token unp_token = LWKT_TOKEN_INITIALIZER(unp_token); 100 static struct taskqueue *unp_taskqueue; 101 102 static struct unp_defdiscard_list unp_defdiscard_head; 103 static struct spinlock unp_defdiscard_spin; 104 static struct task unp_defdiscard_task; 105 106 /* 107 * Unix communications domain. 108 * 109 * TODO: 110 * RDM 111 * rethink name space problems 112 * need a proper out-of-band 113 * lock pushdown 114 */ 115 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 116 static ino_t unp_ino = 1; /* prototype for fake inode numbers */ 117 118 static int unp_attach (struct socket *, struct pru_attach_info *); 119 static void unp_detach (struct unpcb *); 120 static int unp_bind (struct unpcb *,struct sockaddr *, struct thread *); 121 static int unp_connect (struct socket *,struct sockaddr *, 122 struct thread *); 123 static void unp_disconnect(struct unpcb *, int); 124 static void unp_shutdown (struct unpcb *); 125 static void unp_gc (void); 126 static int unp_gc_clearmarks(struct file *, void *); 127 static int unp_gc_checkmarks(struct file *, void *); 128 static int unp_gc_checkrefs(struct file *, void *); 129 static void unp_scan (struct mbuf *, void (*)(struct file *, void *), 130 void *data); 131 static void unp_mark (struct file *, void *data); 132 static void unp_discard (struct file *, void *); 133 static int unp_internalize (struct mbuf *, struct thread *); 134 static int unp_listen (struct unpcb *, struct thread *); 135 static void unp_fp_externalize(struct lwp *lp, struct file *fp, int fd, 136 int flags); 137 static int unp_find_lockref(struct sockaddr *nam, struct thread *td, 138 short type, struct unpcb **unp_ret); 139 static int unp_connect_pair(struct unpcb *unp, struct unpcb *unp2); 140 static void unp_drop(struct unpcb *unp, int error); 141 static void unp_defdiscard_taskfunc(void *, int); 142 143 /* 144 * SMP Considerations: 145 * 146 * Since unp_token will be automaticly released upon execution of 147 * blocking code, we need to reference unp_conn before any possible 148 * blocking code to prevent it from being ripped behind our back. 149 * 150 * Any adjustment to unp->unp_conn requires both the global unp_token 151 * AND the per-unp token (lwkt_token_pool_lookup(unp)) to be held. 152 * 153 * Any access to so_pcb to obtain unp requires the pool token for 154 * unp to be held. 155 */ 156 157 static __inline void 158 unp_reference(struct unpcb *unp) 159 { 160 /* 0->1 transition will not work */ 161 KKASSERT(unp->unp_refcnt > 0); 162 atomic_add_int(&unp->unp_refcnt, 1); 163 } 164 165 static __inline void 166 unp_free(struct unpcb *unp) 167 { 168 KKASSERT(unp->unp_refcnt > 0); 169 if (atomic_fetchadd_int(&unp->unp_refcnt, -1) == 1) 170 unp_detach(unp); 171 } 172 173 static __inline struct unpcb * 174 unp_getsocktoken(struct socket *so) 175 { 176 struct unpcb *unp; 177 178 /* 179 * The unp pointer is invalid until we verify that it is 180 * good by re-checking so_pcb AFTER obtaining the token. 181 */ 182 while ((unp = so->so_pcb) != NULL) { 183 lwkt_getpooltoken(unp); 184 if (unp == so->so_pcb) 185 break; 186 lwkt_relpooltoken(unp); 187 } 188 return unp; 189 } 190 191 static __inline void 192 unp_reltoken(struct unpcb *unp) 193 { 194 if (unp != NULL) 195 lwkt_relpooltoken(unp); 196 } 197 198 static __inline void 199 unp_setflags(struct unpcb *unp, int flags) 200 { 201 atomic_set_int(&unp->unp_flags, flags); 202 } 203 204 static __inline void 205 unp_clrflags(struct unpcb *unp, int flags) 206 { 207 atomic_clear_int(&unp->unp_flags, flags); 208 } 209 210 static __inline struct unp_global_head * 211 unp_globalhead(short type) 212 { 213 switch (type) { 214 case SOCK_STREAM: 215 return &unp_stream_head; 216 case SOCK_DGRAM: 217 return &unp_dgram_head; 218 case SOCK_SEQPACKET: 219 return &unp_seqpkt_head; 220 default: 221 panic("unknown socket type %d", type); 222 } 223 } 224 225 /* 226 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 227 * will sofree() it when we return. 228 */ 229 static void 230 uipc_abort(netmsg_t msg) 231 { 232 struct unpcb *unp; 233 int error; 234 235 lwkt_gettoken(&unp_token); 236 unp = unp_getsocktoken(msg->base.nm_so); 237 238 if (UNP_ISATTACHED(unp)) { 239 unp_setflags(unp, UNP_DETACHED); 240 unp_drop(unp, ECONNABORTED); 241 unp_free(unp); 242 error = 0; 243 } else { 244 error = EINVAL; 245 } 246 247 unp_reltoken(unp); 248 lwkt_reltoken(&unp_token); 249 250 lwkt_replymsg(&msg->lmsg, error); 251 } 252 253 static void 254 uipc_accept(netmsg_t msg) 255 { 256 struct unpcb *unp; 257 int error; 258 259 lwkt_gettoken(&unp_token); 260 unp = unp_getsocktoken(msg->base.nm_so); 261 262 if (!UNP_ISATTACHED(unp)) { 263 error = EINVAL; 264 } else { 265 struct unpcb *unp2 = unp->unp_conn; 266 267 /* 268 * Pass back name of connected socket, 269 * if it was bound and we are still connected 270 * (our peer may have closed already!). 271 */ 272 if (unp2 && unp2->unp_addr) { 273 unp_reference(unp2); 274 *msg->accept.nm_nam = dup_sockaddr( 275 (struct sockaddr *)unp2->unp_addr); 276 unp_free(unp2); 277 } else { 278 *msg->accept.nm_nam = dup_sockaddr(&sun_noname); 279 } 280 error = 0; 281 } 282 283 unp_reltoken(unp); 284 lwkt_reltoken(&unp_token); 285 286 lwkt_replymsg(&msg->lmsg, error); 287 } 288 289 static void 290 uipc_attach(netmsg_t msg) 291 { 292 int error; 293 294 lwkt_gettoken(&unp_token); 295 296 KASSERT(msg->base.nm_so->so_pcb == NULL, ("double unp attach")); 297 error = unp_attach(msg->base.nm_so, msg->attach.nm_ai); 298 299 lwkt_reltoken(&unp_token); 300 lwkt_replymsg(&msg->lmsg, error); 301 } 302 303 static void 304 uipc_bind(netmsg_t msg) 305 { 306 struct unpcb *unp; 307 int error; 308 309 lwkt_gettoken(&unp_token); 310 unp = unp_getsocktoken(msg->base.nm_so); 311 312 if (UNP_ISATTACHED(unp)) 313 error = unp_bind(unp, msg->bind.nm_nam, msg->bind.nm_td); 314 else 315 error = EINVAL; 316 317 unp_reltoken(unp); 318 lwkt_reltoken(&unp_token); 319 320 lwkt_replymsg(&msg->lmsg, error); 321 } 322 323 static void 324 uipc_connect(netmsg_t msg) 325 { 326 int error; 327 328 error = unp_connect(msg->base.nm_so, msg->connect.nm_nam, 329 msg->connect.nm_td); 330 lwkt_replymsg(&msg->lmsg, error); 331 } 332 333 static void 334 uipc_connect2(netmsg_t msg) 335 { 336 int error; 337 338 error = unp_connect2(msg->connect2.nm_so1, msg->connect2.nm_so2); 339 lwkt_replymsg(&msg->lmsg, error); 340 } 341 342 /* control is EOPNOTSUPP */ 343 344 static void 345 uipc_detach(netmsg_t msg) 346 { 347 struct unpcb *unp; 348 int error; 349 350 lwkt_gettoken(&unp_token); 351 unp = unp_getsocktoken(msg->base.nm_so); 352 353 if (UNP_ISATTACHED(unp)) { 354 unp_setflags(unp, UNP_DETACHED); 355 unp_drop(unp, 0); 356 unp_free(unp); 357 error = 0; 358 } else { 359 error = EINVAL; 360 } 361 362 unp_reltoken(unp); 363 lwkt_reltoken(&unp_token); 364 365 lwkt_replymsg(&msg->lmsg, error); 366 } 367 368 static void 369 uipc_disconnect(netmsg_t msg) 370 { 371 struct unpcb *unp; 372 int error; 373 374 lwkt_gettoken(&unp_token); 375 unp = unp_getsocktoken(msg->base.nm_so); 376 377 if (UNP_ISATTACHED(unp)) { 378 unp_disconnect(unp, 0); 379 error = 0; 380 } else { 381 error = EINVAL; 382 } 383 384 unp_reltoken(unp); 385 lwkt_reltoken(&unp_token); 386 387 lwkt_replymsg(&msg->lmsg, error); 388 } 389 390 static void 391 uipc_listen(netmsg_t msg) 392 { 393 struct unpcb *unp; 394 int error; 395 396 lwkt_gettoken(&unp_token); 397 unp = unp_getsocktoken(msg->base.nm_so); 398 399 if (!UNP_ISATTACHED(unp) || unp->unp_vnode == NULL) 400 error = EINVAL; 401 else 402 error = unp_listen(unp, msg->listen.nm_td); 403 404 unp_reltoken(unp); 405 lwkt_reltoken(&unp_token); 406 407 lwkt_replymsg(&msg->lmsg, error); 408 } 409 410 static void 411 uipc_peeraddr(netmsg_t msg) 412 { 413 struct unpcb *unp; 414 int error; 415 416 lwkt_gettoken(&unp_token); 417 unp = unp_getsocktoken(msg->base.nm_so); 418 419 if (!UNP_ISATTACHED(unp)) { 420 error = EINVAL; 421 } else if (unp->unp_conn && unp->unp_conn->unp_addr) { 422 struct unpcb *unp2 = unp->unp_conn; 423 424 unp_reference(unp2); 425 *msg->peeraddr.nm_nam = dup_sockaddr( 426 (struct sockaddr *)unp2->unp_addr); 427 unp_free(unp2); 428 error = 0; 429 } else { 430 /* 431 * XXX: It seems that this test always fails even when 432 * connection is established. So, this else clause is 433 * added as workaround to return PF_LOCAL sockaddr. 434 */ 435 *msg->peeraddr.nm_nam = dup_sockaddr(&sun_noname); 436 error = 0; 437 } 438 439 unp_reltoken(unp); 440 lwkt_reltoken(&unp_token); 441 442 lwkt_replymsg(&msg->lmsg, error); 443 } 444 445 static void 446 uipc_rcvd(netmsg_t msg) 447 { 448 struct unpcb *unp, *unp2; 449 struct socket *so; 450 struct socket *so2; 451 int error; 452 453 /* 454 * so_pcb is only modified with both the global and the unp 455 * pool token held. 456 */ 457 so = msg->base.nm_so; 458 unp = unp_getsocktoken(so); 459 460 if (!UNP_ISATTACHED(unp)) { 461 error = EINVAL; 462 goto done; 463 } 464 465 switch (so->so_type) { 466 case SOCK_DGRAM: 467 panic("uipc_rcvd DGRAM?"); 468 /*NOTREACHED*/ 469 case SOCK_STREAM: 470 case SOCK_SEQPACKET: 471 if (unp->unp_conn == NULL) 472 break; 473 unp2 = unp->unp_conn; /* protected by pool token */ 474 475 /* 476 * Because we are transfering mbufs directly to the 477 * peer socket we have to use SSB_STOP on the sender 478 * to prevent it from building up infinite mbufs. 479 * 480 * As in several places in this module w ehave to ref unp2 481 * to ensure that it does not get ripped out from under us 482 * if we block on the so2 token or in sowwakeup(). 483 */ 484 so2 = unp2->unp_socket; 485 unp_reference(unp2); 486 lwkt_gettoken(&so2->so_rcv.ssb_token); 487 if (so->so_rcv.ssb_cc < so2->so_snd.ssb_hiwat && 488 so->so_rcv.ssb_mbcnt < so2->so_snd.ssb_mbmax 489 ) { 490 atomic_clear_int(&so2->so_snd.ssb_flags, SSB_STOP); 491 492 sowwakeup(so2); 493 } 494 lwkt_reltoken(&so2->so_rcv.ssb_token); 495 unp_free(unp2); 496 break; 497 default: 498 panic("uipc_rcvd unknown socktype"); 499 /*NOTREACHED*/ 500 } 501 error = 0; 502 done: 503 unp_reltoken(unp); 504 lwkt_replymsg(&msg->lmsg, error); 505 } 506 507 /* pru_rcvoob is EOPNOTSUPP */ 508 509 static void 510 uipc_send(netmsg_t msg) 511 { 512 struct unpcb *unp, *unp2; 513 struct socket *so; 514 struct socket *so2; 515 struct mbuf *control; 516 struct mbuf *m; 517 int error = 0; 518 519 so = msg->base.nm_so; 520 control = msg->send.nm_control; 521 m = msg->send.nm_m; 522 523 /* 524 * so_pcb is only modified with both the global and the unp 525 * pool token held. 526 */ 527 so = msg->base.nm_so; 528 unp = unp_getsocktoken(so); 529 530 if (!UNP_ISATTACHED(unp)) { 531 error = EINVAL; 532 goto release; 533 } 534 535 if (msg->send.nm_flags & PRUS_OOB) { 536 error = EOPNOTSUPP; 537 goto release; 538 } 539 540 wakeup_start_delayed(); 541 542 if (control && (error = unp_internalize(control, msg->send.nm_td))) 543 goto release; 544 545 switch (so->so_type) { 546 case SOCK_DGRAM: 547 { 548 struct sockaddr *from; 549 550 if (msg->send.nm_addr) { 551 if (unp->unp_conn) { 552 error = EISCONN; 553 break; 554 } 555 lwkt_gettoken(&unp_token); 556 error = unp_find_lockref(msg->send.nm_addr, 557 msg->send.nm_td, so->so_type, &unp2); 558 lwkt_reltoken(&unp_token); 559 if (error) 560 break; 561 /* 562 * NOTE: 563 * unp2 is locked and referenced. 564 * 565 * We could unlock unp2 now, since it was checked 566 * and referenced. 567 */ 568 unp_reltoken(unp2); 569 } else { 570 if (unp->unp_conn == NULL) { 571 error = ENOTCONN; 572 break; 573 } 574 unp2 = unp->unp_conn; 575 unp_reference(unp2); 576 } 577 /* NOTE: unp2 is referenced. */ 578 so2 = unp2->unp_socket; 579 580 if (unp->unp_addr) 581 from = (struct sockaddr *)unp->unp_addr; 582 else 583 from = &sun_noname; 584 585 lwkt_gettoken(&so2->so_rcv.ssb_token); 586 if (ssb_appendaddr(&so2->so_rcv, from, m, control)) { 587 sorwakeup(so2); 588 m = NULL; 589 control = NULL; 590 } else { 591 error = ENOBUFS; 592 } 593 lwkt_reltoken(&so2->so_rcv.ssb_token); 594 595 unp_free(unp2); 596 break; 597 } 598 599 case SOCK_STREAM: 600 case SOCK_SEQPACKET: 601 /* Connect if not connected yet. */ 602 /* 603 * Note: A better implementation would complain 604 * if not equal to the peer's address. 605 */ 606 if (unp->unp_conn == NULL) { 607 if (msg->send.nm_addr) { 608 error = unp_connect(so, 609 msg->send.nm_addr, 610 msg->send.nm_td); 611 if (error) 612 break; /* XXX */ 613 } 614 /* 615 * NOTE: 616 * unp_conn still could be NULL, even if the 617 * above unp_connect() succeeds; since the 618 * current unp's token could be released due 619 * to blocking operations after unp_conn is 620 * assigned. 621 */ 622 if (unp->unp_conn == NULL) { 623 error = ENOTCONN; 624 break; 625 } 626 } 627 if (so->so_state & SS_CANTSENDMORE) { 628 error = EPIPE; 629 break; 630 } 631 632 unp2 = unp->unp_conn; 633 KASSERT(unp2 != NULL, ("unp is not connected")); 634 so2 = unp2->unp_socket; 635 636 unp_reference(unp2); 637 638 /* 639 * Send to paired receive port, and then reduce 640 * send buffer hiwater marks to maintain backpressure. 641 * Wake up readers. 642 */ 643 lwkt_gettoken(&so2->so_rcv.ssb_token); 644 if (control) { 645 if (ssb_appendcontrol(&so2->so_rcv, m, control)) { 646 control = NULL; 647 m = NULL; 648 } 649 } else if (so->so_type == SOCK_SEQPACKET) { 650 sbappendrecord(&so2->so_rcv.sb, m); 651 m = NULL; 652 } else { 653 sbappend(&so2->so_rcv.sb, m); 654 m = NULL; 655 } 656 657 /* 658 * Because we are transfering mbufs directly to the 659 * peer socket we have to use SSB_STOP on the sender 660 * to prevent it from building up infinite mbufs. 661 */ 662 if (so2->so_rcv.ssb_cc >= so->so_snd.ssb_hiwat || 663 so2->so_rcv.ssb_mbcnt >= so->so_snd.ssb_mbmax 664 ) { 665 atomic_set_int(&so->so_snd.ssb_flags, SSB_STOP); 666 } 667 lwkt_reltoken(&so2->so_rcv.ssb_token); 668 sorwakeup(so2); 669 670 unp_free(unp2); 671 break; 672 673 default: 674 panic("uipc_send unknown socktype"); 675 } 676 677 /* 678 * SEND_EOF is equivalent to a SEND followed by a SHUTDOWN. 679 */ 680 if (msg->send.nm_flags & PRUS_EOF) { 681 socantsendmore(so); 682 unp_shutdown(unp); 683 } 684 685 if (control && error != 0) 686 unp_dispose(control); 687 release: 688 unp_reltoken(unp); 689 wakeup_end_delayed(); 690 691 if (control) 692 m_freem(control); 693 if (m) 694 m_freem(m); 695 lwkt_replymsg(&msg->lmsg, error); 696 } 697 698 /* 699 * MPSAFE 700 */ 701 static void 702 uipc_sense(netmsg_t msg) 703 { 704 struct unpcb *unp; 705 struct socket *so; 706 struct stat *sb; 707 int error; 708 709 so = msg->base.nm_so; 710 sb = msg->sense.nm_stat; 711 712 /* 713 * so_pcb is only modified with both the global and the unp 714 * pool token held. 715 */ 716 unp = unp_getsocktoken(so); 717 718 if (!UNP_ISATTACHED(unp)) { 719 error = EINVAL; 720 goto done; 721 } 722 723 sb->st_blksize = so->so_snd.ssb_hiwat; 724 sb->st_dev = NOUDEV; 725 if (unp->unp_ino == 0) { /* make up a non-zero inode number */ 726 unp->unp_ino = atomic_fetchadd_long(&unp_ino, 1); 727 if (__predict_false(unp->unp_ino == 0)) 728 unp->unp_ino = atomic_fetchadd_long(&unp_ino, 1); 729 } 730 sb->st_ino = unp->unp_ino; 731 error = 0; 732 done: 733 unp_reltoken(unp); 734 lwkt_replymsg(&msg->lmsg, error); 735 } 736 737 static void 738 uipc_shutdown(netmsg_t msg) 739 { 740 struct socket *so; 741 struct unpcb *unp; 742 int error; 743 744 /* 745 * so_pcb is only modified with both the global and the unp 746 * pool token held. 747 */ 748 so = msg->base.nm_so; 749 unp = unp_getsocktoken(so); 750 751 if (UNP_ISATTACHED(unp)) { 752 socantsendmore(so); 753 unp_shutdown(unp); 754 error = 0; 755 } else { 756 error = EINVAL; 757 } 758 759 unp_reltoken(unp); 760 lwkt_replymsg(&msg->lmsg, error); 761 } 762 763 static void 764 uipc_sockaddr(netmsg_t msg) 765 { 766 struct unpcb *unp; 767 int error; 768 769 /* 770 * so_pcb is only modified with both the global and the unp 771 * pool token held. 772 */ 773 unp = unp_getsocktoken(msg->base.nm_so); 774 775 if (UNP_ISATTACHED(unp)) { 776 if (unp->unp_addr) { 777 *msg->sockaddr.nm_nam = 778 dup_sockaddr((struct sockaddr *)unp->unp_addr); 779 } 780 error = 0; 781 } else { 782 error = EINVAL; 783 } 784 785 unp_reltoken(unp); 786 lwkt_replymsg(&msg->lmsg, error); 787 } 788 789 struct pr_usrreqs uipc_usrreqs = { 790 .pru_abort = uipc_abort, 791 .pru_accept = uipc_accept, 792 .pru_attach = uipc_attach, 793 .pru_bind = uipc_bind, 794 .pru_connect = uipc_connect, 795 .pru_connect2 = uipc_connect2, 796 .pru_control = pr_generic_notsupp, 797 .pru_detach = uipc_detach, 798 .pru_disconnect = uipc_disconnect, 799 .pru_listen = uipc_listen, 800 .pru_peeraddr = uipc_peeraddr, 801 .pru_rcvd = uipc_rcvd, 802 .pru_rcvoob = pr_generic_notsupp, 803 .pru_send = uipc_send, 804 .pru_sense = uipc_sense, 805 .pru_shutdown = uipc_shutdown, 806 .pru_sockaddr = uipc_sockaddr, 807 .pru_sosend = sosend, 808 .pru_soreceive = soreceive 809 }; 810 811 void 812 uipc_ctloutput(netmsg_t msg) 813 { 814 struct socket *so; 815 struct sockopt *sopt; 816 struct unpcb *unp; 817 int error = 0; 818 819 so = msg->base.nm_so; 820 sopt = msg->ctloutput.nm_sopt; 821 822 lwkt_gettoken(&unp_token); 823 unp = unp_getsocktoken(so); 824 825 if (!UNP_ISATTACHED(unp)) { 826 error = EINVAL; 827 goto done; 828 } 829 830 switch (sopt->sopt_dir) { 831 case SOPT_GET: 832 switch (sopt->sopt_name) { 833 case LOCAL_PEERCRED: 834 if (unp->unp_flags & UNP_HAVEPC) 835 soopt_from_kbuf(sopt, &unp->unp_peercred, 836 sizeof(unp->unp_peercred)); 837 else { 838 if (so->so_type == SOCK_STREAM) 839 error = ENOTCONN; 840 else if (so->so_type == SOCK_SEQPACKET) 841 error = ENOTCONN; 842 else 843 error = EINVAL; 844 } 845 break; 846 default: 847 error = EOPNOTSUPP; 848 break; 849 } 850 break; 851 case SOPT_SET: 852 default: 853 error = EOPNOTSUPP; 854 break; 855 } 856 857 done: 858 unp_reltoken(unp); 859 lwkt_reltoken(&unp_token); 860 861 lwkt_replymsg(&msg->lmsg, error); 862 } 863 864 /* 865 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 866 * for stream sockets, although the total for sender and receiver is 867 * actually only PIPSIZ. 868 * 869 * Datagram sockets really use the sendspace as the maximum datagram size, 870 * and don't really want to reserve the sendspace. Their recvspace should 871 * be large enough for at least one max-size datagram plus address. 872 * 873 * We want the local send/recv space to be significant larger then lo0's 874 * mtu of 16384. 875 */ 876 #ifndef PIPSIZ 877 #define PIPSIZ 57344 878 #endif 879 static u_long unpst_sendspace = PIPSIZ; 880 static u_long unpst_recvspace = PIPSIZ; 881 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 882 static u_long unpdg_recvspace = 4*1024; 883 884 static int unp_rights; /* file descriptors in flight */ 885 static struct spinlock unp_spin = SPINLOCK_INITIALIZER(&unp_spin, "unp_spin"); 886 887 SYSCTL_DECL(_net_local_seqpacket); 888 SYSCTL_DECL(_net_local_stream); 889 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 890 &unpst_sendspace, 0, "Size of stream socket send buffer"); 891 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 892 &unpst_recvspace, 0, "Size of stream socket receive buffer"); 893 894 SYSCTL_DECL(_net_local_dgram); 895 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 896 &unpdg_sendspace, 0, "Max datagram socket size"); 897 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 898 &unpdg_recvspace, 0, "Size of datagram socket receive buffer"); 899 900 SYSCTL_DECL(_net_local); 901 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, 902 "File descriptors in flight"); 903 904 static int 905 unp_attach(struct socket *so, struct pru_attach_info *ai) 906 { 907 struct unp_global_head *head; 908 struct unpcb *unp; 909 int error; 910 911 lwkt_gettoken(&unp_token); 912 913 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 914 switch (so->so_type) { 915 case SOCK_STREAM: 916 case SOCK_SEQPACKET: 917 error = soreserve(so, unpst_sendspace, unpst_recvspace, 918 ai->sb_rlimit); 919 break; 920 921 case SOCK_DGRAM: 922 error = soreserve(so, unpdg_sendspace, unpdg_recvspace, 923 ai->sb_rlimit); 924 break; 925 926 default: 927 panic("unp_attach"); 928 } 929 if (error) 930 goto failed; 931 } 932 933 /* 934 * In order to support sendfile we have to set either SSB_STOPSUPP 935 * or SSB_PREALLOC. Unix domain sockets use the SSB_STOP flow 936 * control mechanism. 937 */ 938 if (so->so_type == SOCK_STREAM) { 939 atomic_set_int(&so->so_rcv.ssb_flags, SSB_STOPSUPP); 940 atomic_set_int(&so->so_snd.ssb_flags, SSB_STOPSUPP); 941 } 942 943 unp = kmalloc(sizeof(*unp), M_UNPCB, M_WAITOK | M_ZERO | M_NULLOK); 944 if (unp == NULL) { 945 error = ENOBUFS; 946 goto failed; 947 } 948 unp->unp_refcnt = 1; 949 unp->unp_gencnt = ++unp_gencnt; 950 LIST_INIT(&unp->unp_refs); 951 unp->unp_socket = so; 952 unp->unp_rvnode = ai->fd_rdir; /* jail cruft XXX JH */ 953 so->so_pcb = (caddr_t)unp; 954 soreference(so); 955 956 head = unp_globalhead(so->so_type); 957 TAILQ_INSERT_TAIL(&head->list, unp, unp_link); 958 head->count++; 959 error = 0; 960 failed: 961 lwkt_reltoken(&unp_token); 962 return error; 963 } 964 965 static void 966 unp_detach(struct unpcb *unp) 967 { 968 struct unp_global_head *head; 969 struct socket *so; 970 971 lwkt_gettoken(&unp_token); 972 lwkt_getpooltoken(unp); 973 974 so = unp->unp_socket; 975 976 head = unp_globalhead(so->so_type); 977 KASSERT(head->count > 0, ("invalid unp count")); 978 TAILQ_REMOVE(&head->list, unp, unp_link); 979 head->count--; 980 981 unp->unp_gencnt = ++unp_gencnt; 982 if (unp->unp_vnode) { 983 unp->unp_vnode->v_socket = NULL; 984 vrele(unp->unp_vnode); 985 unp->unp_vnode = NULL; 986 } 987 soisdisconnected(so); 988 KKASSERT(so->so_pcb == unp); 989 so->so_pcb = NULL; /* both tokens required */ 990 unp->unp_socket = NULL; 991 992 lwkt_relpooltoken(unp); 993 lwkt_reltoken(&unp_token); 994 995 if (unp_rights) { 996 /* 997 * Normally the receive buffer is flushed later, 998 * in sofree, but if our receive buffer holds references 999 * to descriptors that are now garbage, we will dispose 1000 * of those descriptor references after the garbage collector 1001 * gets them (resulting in a "panic: fdrop: invalid f_count"). 1002 */ 1003 sorflush(so); 1004 unp_gc(); 1005 } 1006 sofree(so); 1007 1008 KASSERT(unp->unp_conn == NULL, ("unp is still connected")); 1009 KASSERT(LIST_EMPTY(&unp->unp_refs), ("unp still has references")); 1010 1011 if (unp->unp_addr) 1012 kfree(unp->unp_addr, M_SONAME); 1013 kfree(unp, M_UNPCB); 1014 } 1015 1016 static int 1017 unp_bind(struct unpcb *unp, struct sockaddr *nam, struct thread *td) 1018 { 1019 struct proc *p = td->td_proc; 1020 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 1021 struct vnode *vp; 1022 struct vattr vattr; 1023 int error, namelen; 1024 struct nlookupdata nd; 1025 char buf[SOCK_MAXADDRLEN]; 1026 1027 ASSERT_LWKT_TOKEN_HELD(&unp_token); 1028 UNP_ASSERT_TOKEN_HELD(unp); 1029 1030 if (unp->unp_vnode != NULL) 1031 return EINVAL; 1032 1033 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 1034 if (namelen <= 0) 1035 return EINVAL; 1036 strncpy(buf, soun->sun_path, namelen); 1037 buf[namelen] = 0; /* null-terminate the string */ 1038 error = nlookup_init(&nd, buf, UIO_SYSSPACE, 1039 NLC_LOCKVP | NLC_CREATE | NLC_REFDVP); 1040 if (error == 0) 1041 error = nlookup(&nd); 1042 if (error == 0 && nd.nl_nch.ncp->nc_vp != NULL) 1043 error = EADDRINUSE; 1044 if (error) 1045 goto done; 1046 1047 VATTR_NULL(&vattr); 1048 vattr.va_type = VSOCK; 1049 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask); 1050 error = VOP_NCREATE(&nd.nl_nch, nd.nl_dvp, &vp, nd.nl_cred, &vattr); 1051 if (error == 0) { 1052 if (unp->unp_vnode == NULL) { 1053 vp->v_socket = unp->unp_socket; 1054 unp->unp_vnode = vp; 1055 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam); 1056 vn_unlock(vp); 1057 } else { 1058 vput(vp); /* late race */ 1059 error = EINVAL; 1060 } 1061 } 1062 done: 1063 nlookup_done(&nd); 1064 return (error); 1065 } 1066 1067 static int 1068 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1069 { 1070 struct unpcb *unp, *unp2; 1071 int error, flags = 0; 1072 1073 lwkt_gettoken(&unp_token); 1074 1075 unp = unp_getsocktoken(so); 1076 if (!UNP_ISATTACHED(unp)) { 1077 error = EINVAL; 1078 goto failed; 1079 } 1080 1081 if ((unp->unp_flags & UNP_CONNECTING) || unp->unp_conn != NULL) { 1082 error = EISCONN; 1083 goto failed; 1084 } 1085 1086 flags = UNP_CONNECTING; 1087 unp_setflags(unp, flags); 1088 1089 error = unp_find_lockref(nam, td, so->so_type, &unp2); 1090 if (error) 1091 goto failed; 1092 /* 1093 * NOTE: 1094 * unp2 is locked and referenced. 1095 */ 1096 1097 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 1098 struct socket *so2, *so3; 1099 struct unpcb *unp3; 1100 1101 so2 = unp2->unp_socket; 1102 if (!(so2->so_options & SO_ACCEPTCONN) || 1103 (so3 = sonewconn_faddr(so2, 0, NULL, 1104 TRUE /* keep ref */)) == NULL) { 1105 error = ECONNREFUSED; 1106 goto done; 1107 } 1108 /* so3 has a socket reference. */ 1109 1110 unp3 = unp_getsocktoken(so3); 1111 if (!UNP_ISATTACHED(unp3)) { 1112 unp_reltoken(unp3); 1113 /* 1114 * Already aborted; we only need to drop the 1115 * socket reference held by sonewconn_faddr(). 1116 */ 1117 sofree(so3); 1118 error = ECONNREFUSED; 1119 goto done; 1120 } 1121 unp_reference(unp3); 1122 /* 1123 * NOTE: 1124 * unp3 is locked and referenced. 1125 */ 1126 1127 /* 1128 * Release so3 socket reference held by sonewconn_faddr(). 1129 * Since we have referenced unp3, neither unp3 nor so3 will 1130 * be destroyed here. 1131 */ 1132 sofree(so3); 1133 1134 if (unp2->unp_addr != NULL) { 1135 unp3->unp_addr = (struct sockaddr_un *) 1136 dup_sockaddr((struct sockaddr *)unp2->unp_addr); 1137 } 1138 1139 /* 1140 * unp_peercred management: 1141 * 1142 * The connecter's (client's) credentials are copied 1143 * from its process structure at the time of connect() 1144 * (which is now). 1145 */ 1146 cru2x(td->td_proc->p_ucred, &unp3->unp_peercred); 1147 unp_setflags(unp3, UNP_HAVEPC); 1148 /* 1149 * The receiver's (server's) credentials are copied 1150 * from the unp_peercred member of socket on which the 1151 * former called listen(); unp_listen() cached that 1152 * process's credentials at that time so we can use 1153 * them now. 1154 */ 1155 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 1156 ("unp_connect: listener without cached peercred")); 1157 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 1158 sizeof(unp->unp_peercred)); 1159 unp_setflags(unp, UNP_HAVEPC); 1160 1161 error = unp_connect_pair(unp, unp3); 1162 if (error) 1163 soabort_direct(so3); 1164 1165 /* Done with unp3 */ 1166 unp_free(unp3); 1167 unp_reltoken(unp3); 1168 } else { 1169 error = unp_connect_pair(unp, unp2); 1170 } 1171 done: 1172 unp_free(unp2); 1173 unp_reltoken(unp2); 1174 failed: 1175 if (flags) 1176 unp_clrflags(unp, flags); 1177 unp_reltoken(unp); 1178 1179 lwkt_reltoken(&unp_token); 1180 return (error); 1181 } 1182 1183 /* 1184 * Connect two unix domain sockets together. 1185 * 1186 * NOTE: Semantics for any change to unp_conn requires that the per-unp 1187 * pool token also be held. 1188 */ 1189 int 1190 unp_connect2(struct socket *so, struct socket *so2) 1191 { 1192 struct unpcb *unp, *unp2; 1193 int error; 1194 1195 lwkt_gettoken(&unp_token); 1196 if (so2->so_type != so->so_type) { 1197 lwkt_reltoken(&unp_token); 1198 return (EPROTOTYPE); 1199 } 1200 unp = unp_getsocktoken(so); 1201 unp2 = unp_getsocktoken(so2); 1202 1203 if (!UNP_ISATTACHED(unp)) { 1204 error = EINVAL; 1205 goto done; 1206 } 1207 if (!UNP_ISATTACHED(unp2)) { 1208 error = ECONNREFUSED; 1209 goto done; 1210 } 1211 1212 if (unp->unp_conn != NULL) { 1213 error = EISCONN; 1214 goto done; 1215 } 1216 if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) && 1217 unp2->unp_conn != NULL) { 1218 error = EISCONN; 1219 goto done; 1220 } 1221 1222 error = unp_connect_pair(unp, unp2); 1223 done: 1224 unp_reltoken(unp2); 1225 unp_reltoken(unp); 1226 lwkt_reltoken(&unp_token); 1227 return (error); 1228 } 1229 1230 /* 1231 * Disconnect a unix domain socket pair. 1232 * 1233 * NOTE: Semantics for any change to unp_conn requires that the per-unp 1234 * pool token also be held. 1235 */ 1236 static void 1237 unp_disconnect(struct unpcb *unp, int error) 1238 { 1239 struct socket *so = unp->unp_socket; 1240 struct unpcb *unp2; 1241 1242 ASSERT_LWKT_TOKEN_HELD(&unp_token); 1243 UNP_ASSERT_TOKEN_HELD(unp); 1244 1245 if (error) 1246 so->so_error = error; 1247 1248 while ((unp2 = unp->unp_conn) != NULL) { 1249 lwkt_getpooltoken(unp2); 1250 if (unp2 == unp->unp_conn) 1251 break; 1252 lwkt_relpooltoken(unp2); 1253 } 1254 if (unp2 == NULL) 1255 return; 1256 /* unp2 is locked. */ 1257 1258 KASSERT((unp2->unp_flags & UNP_DROPPED) == 0, ("unp2 was dropped")); 1259 1260 unp->unp_conn = NULL; 1261 1262 switch (so->so_type) { 1263 case SOCK_DGRAM: 1264 LIST_REMOVE(unp, unp_reflink); 1265 soclrstate(so, SS_ISCONNECTED); 1266 break; 1267 1268 case SOCK_STREAM: 1269 case SOCK_SEQPACKET: 1270 /* 1271 * Keep a reference before clearing the unp_conn 1272 * to avoid racing uipc_detach()/uipc_abort() in 1273 * other thread. 1274 */ 1275 unp_reference(unp2); 1276 KASSERT(unp2->unp_conn == unp, ("unp_conn mismatch")); 1277 unp2->unp_conn = NULL; 1278 1279 soisdisconnected(so); 1280 soisdisconnected(unp2->unp_socket); 1281 1282 unp_free(unp2); 1283 break; 1284 } 1285 1286 lwkt_relpooltoken(unp2); 1287 } 1288 1289 #ifdef notdef 1290 void 1291 unp_abort(struct unpcb *unp) 1292 { 1293 lwkt_gettoken(&unp_token); 1294 unp_free(unp); 1295 lwkt_reltoken(&unp_token); 1296 } 1297 #endif 1298 1299 static int 1300 prison_unpcb(struct thread *td, struct unpcb *unp) 1301 { 1302 struct proc *p; 1303 1304 if (td == NULL) 1305 return (0); 1306 if ((p = td->td_proc) == NULL) 1307 return (0); 1308 if (!p->p_ucred->cr_prison) 1309 return (0); 1310 if (p->p_fd->fd_rdir == unp->unp_rvnode) 1311 return (0); 1312 return (1); 1313 } 1314 1315 static int 1316 unp_pcblist(SYSCTL_HANDLER_ARGS) 1317 { 1318 struct unp_global_head *head = arg1; 1319 int error, i, n; 1320 struct unpcb *unp, *marker; 1321 1322 KKASSERT(curproc != NULL); 1323 1324 /* 1325 * The process of preparing the PCB list is too time-consuming and 1326 * resource-intensive to repeat twice on every request. 1327 */ 1328 if (req->oldptr == NULL) { 1329 n = head->count; 1330 req->oldidx = (n + n/8) * sizeof(struct xunpcb); 1331 return 0; 1332 } 1333 1334 if (req->newptr != NULL) 1335 return EPERM; 1336 1337 marker = kmalloc(sizeof(*marker), M_UNPCB, M_WAITOK | M_ZERO); 1338 marker->unp_flags |= UNP_MARKER; 1339 1340 lwkt_gettoken(&unp_token); 1341 1342 n = head->count; 1343 i = 0; 1344 error = 0; 1345 1346 TAILQ_INSERT_HEAD(&head->list, marker, unp_link); 1347 while ((unp = TAILQ_NEXT(marker, unp_link)) != NULL && i < n) { 1348 struct xunpcb xu; 1349 1350 TAILQ_REMOVE(&head->list, marker, unp_link); 1351 TAILQ_INSERT_AFTER(&head->list, unp, marker, unp_link); 1352 1353 if (unp->unp_flags & UNP_MARKER) 1354 continue; 1355 if (prison_unpcb(req->td, unp)) 1356 continue; 1357 1358 xu.xu_len = sizeof(xu); 1359 xu.xu_unpp = unp; 1360 1361 /* 1362 * NOTE: 1363 * unp->unp_addr and unp->unp_conn are protected by 1364 * unp_token. So if we want to get rid of unp_token 1365 * or reduce the coverage of unp_token, care must be 1366 * taken. 1367 */ 1368 if (unp->unp_addr) { 1369 bcopy(unp->unp_addr, &xu.xu_addr, 1370 unp->unp_addr->sun_len); 1371 } 1372 if (unp->unp_conn && unp->unp_conn->unp_addr) { 1373 bcopy(unp->unp_conn->unp_addr, 1374 &xu.xu_caddr, 1375 unp->unp_conn->unp_addr->sun_len); 1376 } 1377 bcopy(unp, &xu.xu_unp, sizeof(*unp)); 1378 sotoxsocket(unp->unp_socket, &xu.xu_socket); 1379 1380 /* NOTE: This could block and temporarily release unp_token */ 1381 error = SYSCTL_OUT(req, &xu, sizeof(xu)); 1382 if (error) 1383 break; 1384 ++i; 1385 } 1386 TAILQ_REMOVE(&head->list, marker, unp_link); 1387 1388 lwkt_reltoken(&unp_token); 1389 1390 kfree(marker, M_UNPCB); 1391 return error; 1392 } 1393 1394 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD, 1395 &unp_dgram_head, 0, unp_pcblist, "S,xunpcb", 1396 "List of active local datagram sockets"); 1397 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD, 1398 &unp_stream_head, 0, unp_pcblist, "S,xunpcb", 1399 "List of active local stream sockets"); 1400 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist, CTLFLAG_RD, 1401 &unp_seqpkt_head, 0, unp_pcblist, "S,xunpcb", 1402 "List of active local seqpacket sockets"); 1403 1404 static void 1405 unp_shutdown(struct unpcb *unp) 1406 { 1407 struct socket *so; 1408 1409 if ((unp->unp_socket->so_type == SOCK_STREAM || 1410 unp->unp_socket->so_type == SOCK_SEQPACKET) && 1411 unp->unp_conn != NULL && (so = unp->unp_conn->unp_socket)) { 1412 socantrcvmore(so); 1413 } 1414 } 1415 1416 #ifdef notdef 1417 void 1418 unp_drain(void) 1419 { 1420 lwkt_gettoken(&unp_token); 1421 lwkt_reltoken(&unp_token); 1422 } 1423 #endif 1424 1425 int 1426 unp_externalize(struct mbuf *rights, int flags) 1427 { 1428 struct thread *td = curthread; 1429 struct proc *p = td->td_proc; /* XXX */ 1430 struct lwp *lp = td->td_lwp; 1431 struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 1432 int *fdp; 1433 int i; 1434 struct file **rp; 1435 struct file *fp; 1436 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm)) 1437 / sizeof(struct file *); 1438 int f; 1439 1440 /* 1441 * if the new FD's will not fit, then we free them all 1442 */ 1443 if (!fdavail(p, newfds)) { 1444 rp = (struct file **)CMSG_DATA(cm); 1445 for (i = 0; i < newfds; i++) { 1446 fp = *rp; 1447 /* 1448 * zero the pointer before calling unp_discard, 1449 * since it may end up in unp_gc().. 1450 */ 1451 *rp++ = NULL; 1452 unp_discard(fp, NULL); 1453 } 1454 return (EMSGSIZE); 1455 } 1456 1457 /* 1458 * now change each pointer to an fd in the global table to 1459 * an integer that is the index to the local fd table entry 1460 * that we set up to point to the global one we are transferring. 1461 * Since the sizeof(struct file *) is bigger than or equal to 1462 * the sizeof(int), we do it in forward order. In that case, 1463 * an integer will always come in the same place or before its 1464 * corresponding struct file pointer. 1465 * 1466 * Hold revoke_token in 'shared' mode, so that we won't miss 1467 * the FREVOKED update on fps being externalized (fsetfd). 1468 */ 1469 lwkt_gettoken_shared(&revoke_token); 1470 fdp = (int *)CMSG_DATA(cm); 1471 rp = (struct file **)CMSG_DATA(cm); 1472 for (i = 0; i < newfds; i++) { 1473 if (fdalloc(p, 0, &f)) { 1474 int j; 1475 1476 /* 1477 * Previous fdavail() can't garantee 1478 * fdalloc() success due to SMP race. 1479 * Just clean up and return the same 1480 * error value as if fdavail() failed. 1481 */ 1482 1483 /* Close externalized files */ 1484 for (j = 0; j < i; j++) 1485 kern_close(fdp[j]); 1486 /* Discard the rest of internal files */ 1487 for (; i < newfds; i++) 1488 unp_discard(rp[i], NULL); 1489 /* Wipe out the control message */ 1490 for (i = 0; i < newfds; i++) 1491 rp[i] = NULL; 1492 1493 lwkt_reltoken(&revoke_token); 1494 return (EMSGSIZE); 1495 } 1496 fp = rp[i]; 1497 unp_fp_externalize(lp, fp, f, flags); 1498 fdp[i] = f; 1499 } 1500 lwkt_reltoken(&revoke_token); 1501 1502 /* 1503 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1504 * differs. 1505 */ 1506 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int)); 1507 rights->m_len = cm->cmsg_len; 1508 1509 return (0); 1510 } 1511 1512 static void 1513 unp_fp_externalize(struct lwp *lp, struct file *fp, int fd, int flags) 1514 { 1515 if (lp) { 1516 struct filedesc *fdp = lp->lwp_proc->p_fd; 1517 1518 KKASSERT(fd >= 0); 1519 if (fp->f_flag & FREVOKED) { 1520 struct file *fx; 1521 int error; 1522 1523 kprintf("Warning: revoked fp exiting unix socket\n"); 1524 error = falloc(lp, &fx, NULL); 1525 if (error == 0) { 1526 if (flags & MSG_CMSG_CLOEXEC) 1527 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 1528 fsetfd(fdp, fx, fd); 1529 fdrop(fx); 1530 } else { 1531 fsetfd(fdp, NULL, fd); 1532 } 1533 } else { 1534 if (flags & MSG_CMSG_CLOEXEC) 1535 fdp->fd_files[fd].fileflags |= UF_EXCLOSE; 1536 fsetfd(fdp, fp, fd); 1537 } 1538 } 1539 spin_lock(&unp_spin); 1540 fp->f_msgcount--; 1541 unp_rights--; 1542 spin_unlock(&unp_spin); 1543 fdrop(fp); 1544 } 1545 1546 void 1547 unp_init(void) 1548 { 1549 TAILQ_INIT(&unp_stream_head.list); 1550 TAILQ_INIT(&unp_dgram_head.list); 1551 TAILQ_INIT(&unp_seqpkt_head.list); 1552 1553 spin_init(&unp_spin, "unpinit"); 1554 1555 SLIST_INIT(&unp_defdiscard_head); 1556 spin_init(&unp_defdiscard_spin, "unpdisc"); 1557 TASK_INIT(&unp_defdiscard_task, 0, unp_defdiscard_taskfunc, NULL); 1558 1559 /* 1560 * Create taskqueue for defered discard, and stick it to 1561 * the last CPU. 1562 */ 1563 unp_taskqueue = taskqueue_create("unp_taskq", M_WAITOK, 1564 taskqueue_thread_enqueue, &unp_taskqueue); 1565 taskqueue_start_threads(&unp_taskqueue, 1, TDPRI_KERN_DAEMON, 1566 ncpus - 1, "unp taskq"); 1567 } 1568 1569 static int 1570 unp_internalize(struct mbuf *control, struct thread *td) 1571 { 1572 struct proc *p = td->td_proc; 1573 struct filedesc *fdescp; 1574 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1575 struct file **rp; 1576 struct file *fp; 1577 int i, fd, *fdp; 1578 struct cmsgcred *cmcred; 1579 int oldfds; 1580 u_int newlen; 1581 int error; 1582 1583 KKASSERT(p); 1584 1585 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) || 1586 cm->cmsg_level != SOL_SOCKET || 1587 CMSG_ALIGN(cm->cmsg_len) != control->m_len) 1588 return EINVAL; 1589 1590 /* 1591 * Fill in credential information. 1592 */ 1593 if (cm->cmsg_type == SCM_CREDS) { 1594 cmcred = (struct cmsgcred *)CMSG_DATA(cm); 1595 cmcred->cmcred_pid = p->p_pid; 1596 cmcred->cmcred_uid = p->p_ucred->cr_ruid; 1597 cmcred->cmcred_gid = p->p_ucred->cr_rgid; 1598 cmcred->cmcred_euid = p->p_ucred->cr_uid; 1599 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups, 1600 CMGROUP_MAX); 1601 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1602 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i]; 1603 return 0; 1604 } 1605 1606 /* 1607 * cmsghdr may not be aligned, do not allow calculation(s) to 1608 * go negative. 1609 */ 1610 if (cm->cmsg_len < CMSG_LEN(0)) 1611 return EINVAL; 1612 1613 oldfds = (cm->cmsg_len - CMSG_LEN(0)) / sizeof(int); 1614 1615 /* 1616 * Now replace the integer FDs with pointers to 1617 * the associated global file table entry.. 1618 * Allocate a bigger buffer as necessary. But if an cluster is not 1619 * enough, return E2BIG. 1620 */ 1621 newlen = CMSG_LEN(oldfds * sizeof(struct file *)); 1622 if (newlen > MCLBYTES) 1623 return E2BIG; 1624 if (newlen - control->m_len > M_TRAILINGSPACE(control)) { 1625 if (control->m_flags & M_EXT) 1626 return E2BIG; 1627 MCLGET(control, M_WAITOK); 1628 if (!(control->m_flags & M_EXT)) 1629 return ENOBUFS; 1630 1631 /* copy the data to the cluster */ 1632 memcpy(mtod(control, char *), cm, cm->cmsg_len); 1633 cm = mtod(control, struct cmsghdr *); 1634 } 1635 1636 fdescp = p->p_fd; 1637 spin_lock_shared(&fdescp->fd_spin); 1638 1639 /* 1640 * check that all the FDs passed in refer to legal OPEN files 1641 * If not, reject the entire operation. 1642 */ 1643 fdp = (int *)CMSG_DATA(cm); 1644 for (i = 0; i < oldfds; i++) { 1645 fd = *fdp++; 1646 if ((unsigned)fd >= fdescp->fd_nfiles || 1647 fdescp->fd_files[fd].fp == NULL) { 1648 error = EBADF; 1649 goto done; 1650 } 1651 if (fdescp->fd_files[fd].fp->f_type == DTYPE_KQUEUE) { 1652 error = EOPNOTSUPP; 1653 goto done; 1654 } 1655 } 1656 1657 /* 1658 * Adjust length, in case sizeof(struct file *) and sizeof(int) 1659 * differs. 1660 */ 1661 cm->cmsg_len = newlen; 1662 control->m_len = CMSG_ALIGN(newlen); 1663 1664 /* 1665 * Transform the file descriptors into struct file pointers. 1666 * Since the sizeof(struct file *) is bigger than or equal to 1667 * the sizeof(int), we do it in reverse order so that the int 1668 * won't get trashed until we're done. 1669 */ 1670 fdp = (int *)CMSG_DATA(cm) + oldfds - 1; 1671 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1; 1672 for (i = 0; i < oldfds; i++) { 1673 fp = fdescp->fd_files[*fdp--].fp; 1674 *rp-- = fp; 1675 fhold(fp); 1676 spin_lock(&unp_spin); 1677 fp->f_msgcount++; 1678 unp_rights++; 1679 spin_unlock(&unp_spin); 1680 } 1681 error = 0; 1682 done: 1683 spin_unlock_shared(&fdescp->fd_spin); 1684 return error; 1685 } 1686 1687 /* 1688 * Garbage collect in-transit file descriptors that get lost due to 1689 * loops (i.e. when a socket is sent to another process over itself, 1690 * and more complex situations). 1691 * 1692 * NOT MPSAFE - TODO socket flush code and maybe fdrop. Rest is MPSAFE. 1693 */ 1694 1695 struct unp_gc_info { 1696 struct file **extra_ref; 1697 struct file *locked_fp; 1698 int defer; 1699 int index; 1700 int maxindex; 1701 }; 1702 1703 static void 1704 unp_gc(void) 1705 { 1706 struct unp_gc_info info; 1707 static boolean_t unp_gcing; 1708 struct file **fpp; 1709 int i; 1710 1711 /* 1712 * Only one gc can be in-progress at any given moment 1713 */ 1714 spin_lock(&unp_spin); 1715 if (unp_gcing) { 1716 spin_unlock(&unp_spin); 1717 return; 1718 } 1719 unp_gcing = TRUE; 1720 spin_unlock(&unp_spin); 1721 1722 lwkt_gettoken(&unp_token); 1723 1724 /* 1725 * Before going through all this, set all FDs to be NOT defered 1726 * and NOT externally accessible (not marked). During the scan 1727 * a fd can be marked externally accessible but we may or may not 1728 * be able to immediately process it (controlled by FDEFER). 1729 * 1730 * If we loop sleep a bit. The complexity of the topology can cause 1731 * multiple loops. Also failure to acquire the socket's so_rcv 1732 * token can cause us to loop. 1733 */ 1734 allfiles_scan_exclusive(unp_gc_clearmarks, NULL); 1735 do { 1736 info.defer = 0; 1737 allfiles_scan_exclusive(unp_gc_checkmarks, &info); 1738 if (info.defer) 1739 tsleep(&info, 0, "gcagain", 1); 1740 } while (info.defer); 1741 1742 /* 1743 * We grab an extra reference to each of the file table entries 1744 * that are not otherwise accessible and then free the rights 1745 * that are stored in messages on them. 1746 * 1747 * The bug in the orginal code is a little tricky, so I'll describe 1748 * what's wrong with it here. 1749 * 1750 * It is incorrect to simply unp_discard each entry for f_msgcount 1751 * times -- consider the case of sockets A and B that contain 1752 * references to each other. On a last close of some other socket, 1753 * we trigger a gc since the number of outstanding rights (unp_rights) 1754 * is non-zero. If during the sweep phase the gc code unp_discards, 1755 * we end up doing a (full) fdrop on the descriptor. A fdrop on A 1756 * results in the following chain. Closef calls soo_close, which 1757 * calls soclose. Soclose calls first (through the switch 1758 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply 1759 * returns because the previous instance had set unp_gcing, and 1760 * we return all the way back to soclose, which marks the socket 1761 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush 1762 * to free up the rights that are queued in messages on the socket A, 1763 * i.e., the reference on B. The sorflush calls via the dom_dispose 1764 * switch unp_dispose, which unp_scans with unp_discard. This second 1765 * instance of unp_discard just calls fdrop on B. 1766 * 1767 * Well, a similar chain occurs on B, resulting in a sorflush on B, 1768 * which results in another fdrop on A. Unfortunately, A is already 1769 * being closed, and the descriptor has already been marked with 1770 * SS_NOFDREF, and soclose panics at this point. 1771 * 1772 * Here, we first take an extra reference to each inaccessible 1773 * descriptor. Then, we call sorflush ourself, since we know 1774 * it is a Unix domain socket anyhow. After we destroy all the 1775 * rights carried in messages, we do a last fdrop to get rid 1776 * of our extra reference. This is the last close, and the 1777 * unp_detach etc will shut down the socket. 1778 * 1779 * 91/09/19, bsy@cs.cmu.edu 1780 */ 1781 info.extra_ref = kmalloc(256 * sizeof(struct file *), M_FILE, M_WAITOK); 1782 info.maxindex = 256; 1783 1784 do { 1785 /* 1786 * Look for matches 1787 */ 1788 info.index = 0; 1789 allfiles_scan_exclusive(unp_gc_checkrefs, &info); 1790 1791 /* 1792 * For each FD on our hit list, do the following two things 1793 */ 1794 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) { 1795 struct file *tfp = *fpp; 1796 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) 1797 sorflush((struct socket *)(tfp->f_data)); 1798 } 1799 for (i = info.index, fpp = info.extra_ref; --i >= 0; ++fpp) 1800 fdrop(*fpp); 1801 } while (info.index == info.maxindex); 1802 1803 lwkt_reltoken(&unp_token); 1804 1805 kfree((caddr_t)info.extra_ref, M_FILE); 1806 unp_gcing = FALSE; 1807 } 1808 1809 /* 1810 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1811 */ 1812 static int 1813 unp_gc_checkrefs(struct file *fp, void *data) 1814 { 1815 struct unp_gc_info *info = data; 1816 1817 if (fp->f_count == 0) 1818 return(0); 1819 if (info->index == info->maxindex) 1820 return(-1); 1821 1822 /* 1823 * If all refs are from msgs, and it's not marked accessible 1824 * then it must be referenced from some unreachable cycle 1825 * of (shut-down) FDs, so include it in our 1826 * list of FDs to remove 1827 */ 1828 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) { 1829 info->extra_ref[info->index++] = fp; 1830 fhold(fp); 1831 } 1832 return(0); 1833 } 1834 1835 /* 1836 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1837 */ 1838 static int 1839 unp_gc_clearmarks(struct file *fp, void *data __unused) 1840 { 1841 atomic_clear_int(&fp->f_flag, FMARK | FDEFER); 1842 return(0); 1843 } 1844 1845 /* 1846 * MPSAFE - NOTE: filehead list and file pointer spinlocked on entry 1847 */ 1848 static int 1849 unp_gc_checkmarks(struct file *fp, void *data) 1850 { 1851 struct unp_gc_info *info = data; 1852 struct socket *so; 1853 1854 /* 1855 * If the file is not open, skip it. Make sure it isn't marked 1856 * defered or we could loop forever, in case we somehow race 1857 * something. 1858 */ 1859 if (fp->f_count == 0) { 1860 if (fp->f_flag & FDEFER) 1861 atomic_clear_int(&fp->f_flag, FDEFER); 1862 return(0); 1863 } 1864 /* 1865 * If we already marked it as 'defer' in a 1866 * previous pass, then try process it this time 1867 * and un-mark it 1868 */ 1869 if (fp->f_flag & FDEFER) { 1870 atomic_clear_int(&fp->f_flag, FDEFER); 1871 } else { 1872 /* 1873 * if it's not defered, then check if it's 1874 * already marked.. if so skip it 1875 */ 1876 if (fp->f_flag & FMARK) 1877 return(0); 1878 /* 1879 * If all references are from messages 1880 * in transit, then skip it. it's not 1881 * externally accessible. 1882 */ 1883 if (fp->f_count == fp->f_msgcount) 1884 return(0); 1885 /* 1886 * If it got this far then it must be 1887 * externally accessible. 1888 */ 1889 atomic_set_int(&fp->f_flag, FMARK); 1890 } 1891 1892 /* 1893 * either it was defered, or it is externally 1894 * accessible and not already marked so. 1895 * Now check if it is possibly one of OUR sockets. 1896 */ 1897 if (fp->f_type != DTYPE_SOCKET || 1898 (so = (struct socket *)fp->f_data) == NULL) { 1899 return(0); 1900 } 1901 if (so->so_proto->pr_domain != &localdomain || 1902 !(so->so_proto->pr_flags & PR_RIGHTS)) { 1903 return(0); 1904 } 1905 1906 /* 1907 * So, Ok, it's one of our sockets and it IS externally accessible 1908 * (or was defered). Now we look to see if we hold any file 1909 * descriptors in its message buffers. Follow those links and mark 1910 * them as accessible too. 1911 * 1912 * We are holding multiple spinlocks here, if we cannot get the 1913 * token non-blocking defer until the next loop. 1914 */ 1915 info->locked_fp = fp; 1916 if (lwkt_trytoken(&so->so_rcv.ssb_token)) { 1917 unp_scan(so->so_rcv.ssb_mb, unp_mark, info); 1918 lwkt_reltoken(&so->so_rcv.ssb_token); 1919 } else { 1920 atomic_set_int(&fp->f_flag, FDEFER); 1921 ++info->defer; 1922 } 1923 return (0); 1924 } 1925 1926 /* 1927 * Dispose of the fp's stored in a mbuf. 1928 * 1929 * The dds loop can cause additional fps to be entered onto the 1930 * list while it is running, flattening out the operation and avoiding 1931 * a deep kernel stack recursion. 1932 */ 1933 void 1934 unp_dispose(struct mbuf *m) 1935 { 1936 if (m) 1937 unp_scan(m, unp_discard, NULL); 1938 } 1939 1940 static int 1941 unp_listen(struct unpcb *unp, struct thread *td) 1942 { 1943 struct proc *p = td->td_proc; 1944 1945 ASSERT_LWKT_TOKEN_HELD(&unp_token); 1946 UNP_ASSERT_TOKEN_HELD(unp); 1947 1948 KKASSERT(p); 1949 cru2x(p->p_ucred, &unp->unp_peercred); 1950 unp_setflags(unp, UNP_HAVEPCCACHED); 1951 return (0); 1952 } 1953 1954 static void 1955 unp_scan(struct mbuf *m0, void (*op)(struct file *, void *), void *data) 1956 { 1957 struct mbuf *m; 1958 struct file **rp; 1959 struct cmsghdr *cm; 1960 int i; 1961 int qfds; 1962 1963 while (m0) { 1964 for (m = m0; m; m = m->m_next) { 1965 if (m->m_type == MT_CONTROL && 1966 m->m_len >= sizeof(*cm)) { 1967 cm = mtod(m, struct cmsghdr *); 1968 if (cm->cmsg_level != SOL_SOCKET || 1969 cm->cmsg_type != SCM_RIGHTS) 1970 continue; 1971 qfds = (cm->cmsg_len - CMSG_LEN(0)) / 1972 sizeof(void *); 1973 rp = (struct file **)CMSG_DATA(cm); 1974 for (i = 0; i < qfds; i++) 1975 (*op)(*rp++, data); 1976 break; /* XXX, but saves time */ 1977 } 1978 } 1979 m0 = m0->m_nextpkt; 1980 } 1981 } 1982 1983 /* 1984 * Mark visibility. info->defer is recalculated on every pass. 1985 */ 1986 static void 1987 unp_mark(struct file *fp, void *data) 1988 { 1989 struct unp_gc_info *info = data; 1990 1991 if ((fp->f_flag & FMARK) == 0) { 1992 ++info->defer; 1993 atomic_set_int(&fp->f_flag, FMARK | FDEFER); 1994 } else if (fp->f_flag & FDEFER) { 1995 ++info->defer; 1996 } 1997 } 1998 1999 /* 2000 * Discard a fp previously held in a unix domain socket mbuf. To 2001 * avoid blowing out the kernel stack due to contrived chain-reactions 2002 * we may have to defer the operation to a higher procedural level. 2003 * 2004 * Caller holds unp_token 2005 */ 2006 static void 2007 unp_discard(struct file *fp, void *data __unused) 2008 { 2009 struct unp_defdiscard *d; 2010 2011 spin_lock(&unp_spin); 2012 fp->f_msgcount--; 2013 unp_rights--; 2014 spin_unlock(&unp_spin); 2015 2016 d = kmalloc(sizeof(*d), M_UNPCB, M_WAITOK); 2017 d->fp = fp; 2018 2019 spin_lock(&unp_defdiscard_spin); 2020 SLIST_INSERT_HEAD(&unp_defdiscard_head, d, next); 2021 spin_unlock(&unp_defdiscard_spin); 2022 2023 taskqueue_enqueue(unp_taskqueue, &unp_defdiscard_task); 2024 } 2025 2026 /* 2027 * NOTE: 2028 * unp_token must be held before calling this function to avoid name 2029 * resolution and v_socket accessing races, especially racing against 2030 * the unp_detach(). 2031 * 2032 * NOTE: 2033 * For anyone caring about unconnected unix socket sending performance, 2034 * other approach could be taken... 2035 */ 2036 static int 2037 unp_find_lockref(struct sockaddr *nam, struct thread *td, short type, 2038 struct unpcb **unp_ret) 2039 { 2040 struct proc *p = td->td_proc; 2041 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 2042 struct vnode *vp = NULL; 2043 struct socket *so; 2044 struct unpcb *unp; 2045 int error, len; 2046 struct nlookupdata nd; 2047 char buf[SOCK_MAXADDRLEN]; 2048 2049 ASSERT_LWKT_TOKEN_HELD(&unp_token); 2050 2051 *unp_ret = NULL; 2052 2053 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 2054 if (len <= 0) { 2055 error = EINVAL; 2056 goto failed; 2057 } 2058 strncpy(buf, soun->sun_path, len); 2059 buf[len] = 0; 2060 2061 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW); 2062 if (error == 0) 2063 error = nlookup(&nd); 2064 if (error == 0) 2065 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 2066 nlookup_done(&nd); 2067 if (error) { 2068 vp = NULL; 2069 goto failed; 2070 } 2071 2072 if (vp->v_type != VSOCK) { 2073 error = ENOTSOCK; 2074 goto failed; 2075 } 2076 error = VOP_EACCESS(vp, VWRITE, p->p_ucred); 2077 if (error) 2078 goto failed; 2079 so = vp->v_socket; 2080 if (so == NULL) { 2081 error = ECONNREFUSED; 2082 goto failed; 2083 } 2084 if (so->so_type != type) { 2085 error = EPROTOTYPE; 2086 goto failed; 2087 } 2088 2089 /* Lock this unp. */ 2090 unp = unp_getsocktoken(so); 2091 if (!UNP_ISATTACHED(unp)) { 2092 unp_reltoken(unp); 2093 error = ECONNREFUSED; 2094 goto failed; 2095 } 2096 /* And keep this unp referenced. */ 2097 unp_reference(unp); 2098 2099 /* Done! */ 2100 *unp_ret = unp; 2101 error = 0; 2102 failed: 2103 if (vp != NULL) 2104 vput(vp); 2105 return error; 2106 } 2107 2108 static int 2109 unp_connect_pair(struct unpcb *unp, struct unpcb *unp2) 2110 { 2111 struct socket *so = unp->unp_socket; 2112 struct socket *so2 = unp2->unp_socket; 2113 2114 ASSERT_LWKT_TOKEN_HELD(&unp_token); 2115 UNP_ASSERT_TOKEN_HELD(unp); 2116 UNP_ASSERT_TOKEN_HELD(unp2); 2117 2118 KASSERT(so->so_type == so2->so_type, 2119 ("socket type mismatch, so %d, so2 %d", so->so_type, so2->so_type)); 2120 2121 if (!UNP_ISATTACHED(unp)) 2122 return EINVAL; 2123 if (!UNP_ISATTACHED(unp2)) 2124 return ECONNREFUSED; 2125 2126 KASSERT(unp->unp_conn == NULL, ("unp is already connected")); 2127 unp->unp_conn = unp2; 2128 2129 switch (so->so_type) { 2130 case SOCK_DGRAM: 2131 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 2132 soisconnected(so); 2133 break; 2134 2135 case SOCK_STREAM: 2136 case SOCK_SEQPACKET: 2137 KASSERT(unp2->unp_conn == NULL, ("unp2 is already connected")); 2138 unp2->unp_conn = unp; 2139 soisconnected(so); 2140 soisconnected(so2); 2141 break; 2142 2143 default: 2144 panic("unp_connect_pair: unknown socket type %d", so->so_type); 2145 } 2146 return 0; 2147 } 2148 2149 static void 2150 unp_drop(struct unpcb *unp, int error) 2151 { 2152 struct unpcb *unp2; 2153 2154 ASSERT_LWKT_TOKEN_HELD(&unp_token); 2155 UNP_ASSERT_TOKEN_HELD(unp); 2156 KASSERT(unp->unp_flags & UNP_DETACHED, ("unp is not detached")); 2157 2158 unp_disconnect(unp, error); 2159 2160 while ((unp2 = LIST_FIRST(&unp->unp_refs)) != NULL) { 2161 lwkt_getpooltoken(unp2); 2162 unp_disconnect(unp2, ECONNRESET); 2163 lwkt_relpooltoken(unp2); 2164 } 2165 unp_setflags(unp, UNP_DROPPED); 2166 } 2167 2168 static void 2169 unp_defdiscard_taskfunc(void *arg __unused, int pending __unused) 2170 { 2171 struct unp_defdiscard *d; 2172 2173 spin_lock(&unp_defdiscard_spin); 2174 while ((d = SLIST_FIRST(&unp_defdiscard_head)) != NULL) { 2175 SLIST_REMOVE_HEAD(&unp_defdiscard_head, next); 2176 spin_unlock(&unp_defdiscard_spin); 2177 2178 fdrop(d->fp); 2179 kfree(d, M_UNPCB); 2180 2181 spin_lock(&unp_defdiscard_spin); 2182 } 2183 spin_unlock(&unp_defdiscard_spin); 2184 } 2185