Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. 4 * Copyright (c) 2004-2009 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94 32 */ 33 34 /* 35 * UNIX Domain (Local) Sockets 36 * 37 * This is an implementation of UNIX (local) domain sockets. Each socket has 38 * an associated struct unpcb (UNIX protocol control block). Stream sockets 39 * may be connected to 0 or 1 other socket. Datagram sockets may be 40 * connected to 0, 1, or many other sockets. Sockets may be created and 41 * connected in pairs (socketpair(2)), or bound/connected to using the file 42 * system name space. For most purposes, only the receive socket buffer is 43 * used, as sending on one socket delivers directly to the receive socket 44 * buffer of a second socket. 45 * 46 * The implementation is substantially complicated by the fact that 47 * "ancillary data", such as file descriptors or credentials, may be passed 48 * across UNIX domain sockets. The potential for passing UNIX domain sockets 49 * over other UNIX domain sockets requires the implementation of a simple 50 * garbage collector to find and tear down cycles of disconnected sockets. 51 * 52 * TODO: 53 * RDM 54 * rethink name space problems 55 * need a proper out-of-band 56 */ 57 58 #include <sys/cdefs.h> 59 __FBSDID("$FreeBSD: releng/11.2/sys/kern/uipc_usrreq.c 331722 2018-03-29 02:50:57Z eadler $"); 60 61 #include "opt_ddb.h" 62 63 #include <sys/param.h> 64 #include <sys/capsicum.h> 65 #include <sys/domain.h> 66 #include <sys/fcntl.h> 67 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */ 68 #include <sys/eventhandler.h> 69 #include <sys/file.h> 70 #include <sys/filedesc.h> 71 #include <sys/kernel.h> 72 #include <sys/lock.h> 73 #include <sys/mbuf.h> 74 #include <sys/mount.h> 75 #include <sys/mutex.h> 76 #include <sys/namei.h> 77 #include <sys/proc.h> 78 #include <sys/protosw.h> 79 #include <sys/queue.h> 80 #include <sys/resourcevar.h> 81 #include <sys/rwlock.h> 82 #include <sys/socket.h> 83 #include <sys/socketvar.h> 84 #include <sys/signalvar.h> 85 #include <sys/stat.h> 86 #include <sys/sx.h> 87 #include <sys/sysctl.h> 88 #include <sys/systm.h> 89 #include <sys/taskqueue.h> 90 #include <sys/un.h> 91 #include <sys/unpcb.h> 92 #include <sys/vnode.h> 93 94 #include <net/vnet.h> 95 96 #ifdef DDB 97 #include <ddb/ddb.h> 98 #endif 99 100 #include <security/mac/mac_framework.h> 101 102 #include <vm/uma.h> 103 104 MALLOC_DECLARE(M_FILECAPS); 105 106 /* 107 * Locking key: 108 * (l) Locked using list lock 109 * (g) Locked using linkage lock 110 */ 111 112 static uma_zone_t unp_zone; 113 static unp_gen_t unp_gencnt; /* (l) */ 114 static u_int unp_count; /* (l) Count of local sockets. */ 115 static ino_t unp_ino; /* Prototype for fake inode numbers. */ 116 static int unp_rights; /* (g) File descriptors in flight. */ 117 static struct unp_head unp_shead; /* (l) List of stream sockets. */ 118 static struct unp_head unp_dhead; /* (l) List of datagram sockets. */ 119 static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */ 120 121 struct unp_defer { 122 SLIST_ENTRY(unp_defer) ud_link; 123 struct file *ud_fp; 124 }; 125 static SLIST_HEAD(, unp_defer) unp_defers; 126 static int unp_defers_count; 127 128 static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL }; 129 130 /* 131 * Garbage collection of cyclic file descriptor/socket references occurs 132 * asynchronously in a taskqueue context in order to avoid recursion and 133 * reentrance in the UNIX domain socket, file descriptor, and socket layer 134 * code. See unp_gc() for a full description. 135 */ 136 static struct timeout_task unp_gc_task; 137 138 /* 139 * The close of unix domain sockets attached as SCM_RIGHTS is 140 * postponed to the taskqueue, to avoid arbitrary recursion depth. 141 * The attached sockets might have another sockets attached. 142 */ 143 static struct task unp_defer_task; 144 145 /* 146 * Both send and receive buffers are allocated PIPSIZ bytes of buffering for 147 * stream sockets, although the total for sender and receiver is actually 148 * only PIPSIZ. 149 * 150 * Datagram sockets really use the sendspace as the maximum datagram size, 151 * and don't really want to reserve the sendspace. Their recvspace should be 152 * large enough for at least one max-size datagram plus address. 153 */ 154 #ifndef PIPSIZ 155 #define PIPSIZ 8192 156 #endif 157 static u_long unpst_sendspace = PIPSIZ; 158 static u_long unpst_recvspace = PIPSIZ; 159 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 160 static u_long unpdg_recvspace = 4*1024; 161 static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */ 162 static u_long unpsp_recvspace = PIPSIZ; 163 164 static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain"); 165 static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0, 166 "SOCK_STREAM"); 167 static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM"); 168 static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0, 169 "SOCK_SEQPACKET"); 170 171 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, 172 &unpst_sendspace, 0, "Default stream send space."); 173 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW, 174 &unpst_recvspace, 0, "Default stream receive space."); 175 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW, 176 &unpdg_sendspace, 0, "Default datagram send space."); 177 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW, 178 &unpdg_recvspace, 0, "Default datagram receive space."); 179 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW, 180 &unpsp_sendspace, 0, "Default seqpacket send space."); 181 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW, 182 &unpsp_recvspace, 0, "Default seqpacket receive space."); 183 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, 184 "File descriptors in flight."); 185 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD, 186 &unp_defers_count, 0, 187 "File descriptors deferred to taskqueue for close."); 188 189 /* 190 * Locking and synchronization: 191 * 192 * Three types of locks exit in the local domain socket implementation: a 193 * global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the 194 * global locks, the list lock protects the socket count, global generation 195 * number, and stream/datagram global lists. The linkage lock protects the 196 * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be 197 * held exclusively over the acquisition of multiple unpcb locks to prevent 198 * deadlock. 199 * 200 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer, 201 * allocated in pru_attach() and freed in pru_detach(). The validity of that 202 * pointer is an invariant, so no lock is required to dereference the so_pcb 203 * pointer if a valid socket reference is held by the caller. In practice, 204 * this is always true during operations performed on a socket. Each unpcb 205 * has a back-pointer to its socket, unp_socket, which will be stable under 206 * the same circumstances. 207 * 208 * This pointer may only be safely dereferenced as long as a valid reference 209 * to the unpcb is held. Typically, this reference will be from the socket, 210 * or from another unpcb when the referring unpcb's lock is held (in order 211 * that the reference not be invalidated during use). For example, to follow 212 * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn, 213 * as unp_socket remains valid as long as the reference to unp_conn is valid. 214 * 215 * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual 216 * atomic reads without the lock may be performed "lockless", but more 217 * complex reads and read-modify-writes require the mutex to be held. No 218 * lock order is defined between unpcb locks -- multiple unpcb locks may be 219 * acquired at the same time only when holding the linkage rwlock 220 * exclusively, which prevents deadlocks. 221 * 222 * Blocking with UNIX domain sockets is a tricky issue: unlike most network 223 * protocols, bind() is a non-atomic operation, and connect() requires 224 * potential sleeping in the protocol, due to potentially waiting on local or 225 * distributed file systems. We try to separate "lookup" operations, which 226 * may sleep, and the IPC operations themselves, which typically can occur 227 * with relative atomicity as locks can be held over the entire operation. 228 * 229 * Another tricky issue is simultaneous multi-threaded or multi-process 230 * access to a single UNIX domain socket. These are handled by the flags 231 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or 232 * binding, both of which involve dropping UNIX domain socket locks in order 233 * to perform namei() and other file system operations. 234 */ 235 static struct rwlock unp_link_rwlock; 236 static struct mtx unp_list_lock; 237 static struct mtx unp_defers_lock; 238 239 #define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \ 240 "unp_link_rwlock") 241 242 #define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \ 243 RA_LOCKED) 244 #define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \ 245 RA_UNLOCKED) 246 247 #define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock) 248 #define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock) 249 #define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock) 250 #define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock) 251 #define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \ 252 RA_WLOCKED) 253 254 #define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \ 255 "unp_list_lock", NULL, MTX_DEF) 256 #define UNP_LIST_LOCK() mtx_lock(&unp_list_lock) 257 #define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock) 258 259 #define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \ 260 "unp_defer", NULL, MTX_DEF) 261 #define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock) 262 #define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock) 263 264 #define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \ 265 "unp_mtx", "unp_mtx", \ 266 MTX_DUPOK|MTX_DEF|MTX_RECURSE) 267 #define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx) 268 #define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx) 269 #define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx) 270 #define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED) 271 272 static int uipc_connect2(struct socket *, struct socket *); 273 static int uipc_ctloutput(struct socket *, struct sockopt *); 274 static int unp_connect(struct socket *, struct sockaddr *, 275 struct thread *); 276 static int unp_connectat(int, struct socket *, struct sockaddr *, 277 struct thread *); 278 static int unp_connect2(struct socket *so, struct socket *so2, int); 279 static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2); 280 static void unp_dispose(struct mbuf *); 281 static void unp_dispose_so(struct socket *so); 282 static void unp_shutdown(struct unpcb *); 283 static void unp_drop(struct unpcb *); 284 static void unp_gc(__unused void *, int); 285 static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int)); 286 static void unp_discard(struct file *); 287 static void unp_freerights(struct filedescent **, int); 288 static void unp_init(void); 289 static int unp_internalize(struct mbuf **, struct thread *); 290 static void unp_internalize_fp(struct file *); 291 static int unp_externalize(struct mbuf *, struct mbuf **, int); 292 static int unp_externalize_fp(struct file *); 293 static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *); 294 static void unp_process_defers(void * __unused, int); 295 296 /* 297 * Definitions of protocols supported in the LOCAL domain. 298 */ 299 static struct domain localdomain; 300 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream; 301 static struct pr_usrreqs uipc_usrreqs_seqpacket; 302 static struct protosw localsw[] = { 303 { 304 .pr_type = SOCK_STREAM, 305 .pr_domain = &localdomain, 306 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS, 307 .pr_ctloutput = &uipc_ctloutput, 308 .pr_usrreqs = &uipc_usrreqs_stream 309 }, 310 { 311 .pr_type = SOCK_DGRAM, 312 .pr_domain = &localdomain, 313 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS, 314 .pr_ctloutput = &uipc_ctloutput, 315 .pr_usrreqs = &uipc_usrreqs_dgram 316 }, 317 { 318 .pr_type = SOCK_SEQPACKET, 319 .pr_domain = &localdomain, 320 321 /* 322 * XXXRW: For now, PR_ADDR because soreceive will bump into them 323 * due to our use of sbappendaddr. A new sbappend variants is needed 324 * that supports both atomic record writes and control data. 325 */ 326 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD| 327 PR_RIGHTS, 328 .pr_ctloutput = &uipc_ctloutput, 329 .pr_usrreqs = &uipc_usrreqs_seqpacket, 330 }, 331 }; 332 333 static struct domain localdomain = { 334 .dom_family = AF_LOCAL, 335 .dom_name = "local", 336 .dom_init = unp_init, 337 .dom_externalize = unp_externalize, 338 .dom_dispose = unp_dispose_so, 339 .dom_protosw = localsw, 340 .dom_protoswNPROTOSW = &localsw[nitems(localsw)] 341 }; 342 DOMAIN_SET(local); 343 344 static void 345 uipc_abort(struct socket *so) 346 { 347 struct unpcb *unp, *unp2; 348 349 unp = sotounpcb(so); 350 KASSERT(unp != NULL, ("uipc_abort: unp == NULL")); 351 352 UNP_LINK_WLOCK(); 353 UNP_PCB_LOCK(unp); 354 unp2 = unp->unp_conn; 355 if (unp2 != NULL) { 356 UNP_PCB_LOCK(unp2); 357 unp_drop(unp2); 358 UNP_PCB_UNLOCK(unp2); 359 } 360 UNP_PCB_UNLOCK(unp); 361 UNP_LINK_WUNLOCK(); 362 } 363 364 static int 365 uipc_accept(struct socket *so, struct sockaddr **nam) 366 { 367 struct unpcb *unp, *unp2; 368 const struct sockaddr *sa; 369 370 /* 371 * Pass back name of connected socket, if it was bound and we are 372 * still connected (our peer may have closed already!). 373 */ 374 unp = sotounpcb(so); 375 KASSERT(unp != NULL, ("uipc_accept: unp == NULL")); 376 377 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 378 UNP_LINK_RLOCK(); 379 unp2 = unp->unp_conn; 380 if (unp2 != NULL && unp2->unp_addr != NULL) { 381 UNP_PCB_LOCK(unp2); 382 sa = (struct sockaddr *) unp2->unp_addr; 383 bcopy(sa, *nam, sa->sa_len); 384 UNP_PCB_UNLOCK(unp2); 385 } else { 386 sa = &sun_noname; 387 bcopy(sa, *nam, sa->sa_len); 388 } 389 UNP_LINK_RUNLOCK(); 390 return (0); 391 } 392 393 static int 394 uipc_attach(struct socket *so, int proto, struct thread *td) 395 { 396 u_long sendspace, recvspace; 397 struct unpcb *unp; 398 int error; 399 400 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL")); 401 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 402 switch (so->so_type) { 403 case SOCK_STREAM: 404 sendspace = unpst_sendspace; 405 recvspace = unpst_recvspace; 406 break; 407 408 case SOCK_DGRAM: 409 sendspace = unpdg_sendspace; 410 recvspace = unpdg_recvspace; 411 break; 412 413 case SOCK_SEQPACKET: 414 sendspace = unpsp_sendspace; 415 recvspace = unpsp_recvspace; 416 break; 417 418 default: 419 panic("uipc_attach"); 420 } 421 error = soreserve(so, sendspace, recvspace); 422 if (error) 423 return (error); 424 } 425 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO); 426 if (unp == NULL) 427 return (ENOBUFS); 428 LIST_INIT(&unp->unp_refs); 429 UNP_PCB_LOCK_INIT(unp); 430 unp->unp_socket = so; 431 so->so_pcb = unp; 432 unp->unp_refcount = 1; 433 if (so->so_head != NULL) 434 unp->unp_flags |= UNP_NASCENT; 435 436 UNP_LIST_LOCK(); 437 unp->unp_gencnt = ++unp_gencnt; 438 unp_count++; 439 switch (so->so_type) { 440 case SOCK_STREAM: 441 LIST_INSERT_HEAD(&unp_shead, unp, unp_link); 442 break; 443 444 case SOCK_DGRAM: 445 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link); 446 break; 447 448 case SOCK_SEQPACKET: 449 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link); 450 break; 451 452 default: 453 panic("uipc_attach"); 454 } 455 UNP_LIST_UNLOCK(); 456 457 return (0); 458 } 459 460 static int 461 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td) 462 { 463 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 464 struct vattr vattr; 465 int error, namelen; 466 struct nameidata nd; 467 struct unpcb *unp; 468 struct vnode *vp; 469 struct mount *mp; 470 cap_rights_t rights; 471 char *buf; 472 473 if (nam->sa_family != AF_UNIX) 474 return (EAFNOSUPPORT); 475 476 unp = sotounpcb(so); 477 KASSERT(unp != NULL, ("uipc_bind: unp == NULL")); 478 479 if (soun->sun_len > sizeof(struct sockaddr_un)) 480 return (EINVAL); 481 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 482 if (namelen <= 0) 483 return (EINVAL); 484 485 /* 486 * We don't allow simultaneous bind() calls on a single UNIX domain 487 * socket, so flag in-progress operations, and return an error if an 488 * operation is already in progress. 489 * 490 * Historically, we have not allowed a socket to be rebound, so this 491 * also returns an error. Not allowing re-binding simplifies the 492 * implementation and avoids a great many possible failure modes. 493 */ 494 UNP_PCB_LOCK(unp); 495 if (unp->unp_vnode != NULL) { 496 UNP_PCB_UNLOCK(unp); 497 return (EINVAL); 498 } 499 if (unp->unp_flags & UNP_BINDING) { 500 UNP_PCB_UNLOCK(unp); 501 return (EALREADY); 502 } 503 unp->unp_flags |= UNP_BINDING; 504 UNP_PCB_UNLOCK(unp); 505 506 buf = malloc(namelen + 1, M_TEMP, M_WAITOK); 507 bcopy(soun->sun_path, buf, namelen); 508 buf[namelen] = 0; 509 510 restart: 511 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE, 512 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td); 513 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 514 error = namei(&nd); 515 if (error) 516 goto error; 517 vp = nd.ni_vp; 518 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 519 NDFREE(&nd, NDF_ONLY_PNBUF); 520 if (nd.ni_dvp == vp) 521 vrele(nd.ni_dvp); 522 else 523 vput(nd.ni_dvp); 524 if (vp != NULL) { 525 vrele(vp); 526 error = EADDRINUSE; 527 goto error; 528 } 529 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 530 if (error) 531 goto error; 532 goto restart; 533 } 534 VATTR_NULL(&vattr); 535 vattr.va_type = VSOCK; 536 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 537 #ifdef MAC 538 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 539 &vattr); 540 #endif 541 if (error == 0) 542 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 543 NDFREE(&nd, NDF_ONLY_PNBUF); 544 vput(nd.ni_dvp); 545 if (error) { 546 vn_finished_write(mp); 547 goto error; 548 } 549 vp = nd.ni_vp; 550 ASSERT_VOP_ELOCKED(vp, "uipc_bind"); 551 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK); 552 553 UNP_LINK_WLOCK(); 554 UNP_PCB_LOCK(unp); 555 VOP_UNP_BIND(vp, unp->unp_socket); 556 unp->unp_vnode = vp; 557 unp->unp_addr = soun; 558 unp->unp_flags &= ~UNP_BINDING; 559 UNP_PCB_UNLOCK(unp); 560 UNP_LINK_WUNLOCK(); 561 VOP_UNLOCK(vp, 0); 562 vn_finished_write(mp); 563 free(buf, M_TEMP); 564 return (0); 565 566 error: 567 UNP_PCB_LOCK(unp); 568 unp->unp_flags &= ~UNP_BINDING; 569 UNP_PCB_UNLOCK(unp); 570 free(buf, M_TEMP); 571 return (error); 572 } 573 574 static int 575 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 576 { 577 578 return (uipc_bindat(AT_FDCWD, so, nam, td)); 579 } 580 581 static int 582 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 583 { 584 int error; 585 586 KASSERT(td == curthread, ("uipc_connect: td != curthread")); 587 UNP_LINK_WLOCK(); 588 error = unp_connect(so, nam, td); 589 UNP_LINK_WUNLOCK(); 590 return (error); 591 } 592 593 static int 594 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam, 595 struct thread *td) 596 { 597 int error; 598 599 KASSERT(td == curthread, ("uipc_connectat: td != curthread")); 600 UNP_LINK_WLOCK(); 601 error = unp_connectat(fd, so, nam, td); 602 UNP_LINK_WUNLOCK(); 603 return (error); 604 } 605 606 static void 607 uipc_close(struct socket *so) 608 { 609 struct unpcb *unp, *unp2; 610 611 unp = sotounpcb(so); 612 KASSERT(unp != NULL, ("uipc_close: unp == NULL")); 613 614 UNP_LINK_WLOCK(); 615 UNP_PCB_LOCK(unp); 616 unp2 = unp->unp_conn; 617 if (unp2 != NULL) { 618 UNP_PCB_LOCK(unp2); 619 unp_disconnect(unp, unp2); 620 UNP_PCB_UNLOCK(unp2); 621 } 622 UNP_PCB_UNLOCK(unp); 623 UNP_LINK_WUNLOCK(); 624 } 625 626 static int 627 uipc_connect2(struct socket *so1, struct socket *so2) 628 { 629 struct unpcb *unp, *unp2; 630 int error; 631 632 UNP_LINK_WLOCK(); 633 unp = so1->so_pcb; 634 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL")); 635 UNP_PCB_LOCK(unp); 636 unp2 = so2->so_pcb; 637 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL")); 638 UNP_PCB_LOCK(unp2); 639 error = unp_connect2(so1, so2, PRU_CONNECT2); 640 UNP_PCB_UNLOCK(unp2); 641 UNP_PCB_UNLOCK(unp); 642 UNP_LINK_WUNLOCK(); 643 return (error); 644 } 645 646 static void 647 uipc_detach(struct socket *so) 648 { 649 struct unpcb *unp, *unp2; 650 struct sockaddr_un *saved_unp_addr; 651 struct vnode *vp; 652 int freeunp, local_unp_rights; 653 654 unp = sotounpcb(so); 655 KASSERT(unp != NULL, ("uipc_detach: unp == NULL")); 656 657 vp = NULL; 658 local_unp_rights = 0; 659 660 UNP_LIST_LOCK(); 661 LIST_REMOVE(unp, unp_link); 662 unp->unp_gencnt = ++unp_gencnt; 663 --unp_count; 664 UNP_LIST_UNLOCK(); 665 666 if ((unp->unp_flags & UNP_NASCENT) != 0) { 667 UNP_PCB_LOCK(unp); 668 goto teardown; 669 } 670 UNP_LINK_WLOCK(); 671 UNP_PCB_LOCK(unp); 672 673 /* 674 * XXXRW: Should assert vp->v_socket == so. 675 */ 676 if ((vp = unp->unp_vnode) != NULL) { 677 VOP_UNP_DETACH(vp); 678 unp->unp_vnode = NULL; 679 } 680 unp2 = unp->unp_conn; 681 if (unp2 != NULL) { 682 UNP_PCB_LOCK(unp2); 683 unp_disconnect(unp, unp2); 684 UNP_PCB_UNLOCK(unp2); 685 } 686 687 /* 688 * We hold the linkage lock exclusively, so it's OK to acquire 689 * multiple pcb locks at a time. 690 */ 691 while (!LIST_EMPTY(&unp->unp_refs)) { 692 struct unpcb *ref = LIST_FIRST(&unp->unp_refs); 693 694 UNP_PCB_LOCK(ref); 695 unp_drop(ref); 696 UNP_PCB_UNLOCK(ref); 697 } 698 local_unp_rights = unp_rights; 699 UNP_LINK_WUNLOCK(); 700 teardown: 701 unp->unp_socket->so_pcb = NULL; 702 saved_unp_addr = unp->unp_addr; 703 unp->unp_addr = NULL; 704 unp->unp_refcount--; 705 freeunp = (unp->unp_refcount == 0); 706 if (saved_unp_addr != NULL) 707 free(saved_unp_addr, M_SONAME); 708 if (freeunp) { 709 UNP_PCB_LOCK_DESTROY(unp); 710 uma_zfree(unp_zone, unp); 711 } else 712 UNP_PCB_UNLOCK(unp); 713 if (vp) 714 vrele(vp); 715 if (local_unp_rights) 716 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1); 717 } 718 719 static int 720 uipc_disconnect(struct socket *so) 721 { 722 struct unpcb *unp, *unp2; 723 724 unp = sotounpcb(so); 725 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL")); 726 727 UNP_LINK_WLOCK(); 728 UNP_PCB_LOCK(unp); 729 unp2 = unp->unp_conn; 730 if (unp2 != NULL) { 731 UNP_PCB_LOCK(unp2); 732 unp_disconnect(unp, unp2); 733 UNP_PCB_UNLOCK(unp2); 734 } 735 UNP_PCB_UNLOCK(unp); 736 UNP_LINK_WUNLOCK(); 737 return (0); 738 } 739 740 static int 741 uipc_listen(struct socket *so, int backlog, struct thread *td) 742 { 743 struct unpcb *unp; 744 int error; 745 746 unp = sotounpcb(so); 747 KASSERT(unp != NULL, ("uipc_listen: unp == NULL")); 748 749 UNP_PCB_LOCK(unp); 750 if (unp->unp_vnode == NULL) { 751 /* Already connected or not bound to an address. */ 752 error = unp->unp_conn != NULL ? EINVAL : EDESTADDRREQ; 753 UNP_PCB_UNLOCK(unp); 754 return (error); 755 } 756 757 SOCK_LOCK(so); 758 error = solisten_proto_check(so); 759 if (error == 0) { 760 cru2x(td->td_ucred, &unp->unp_peercred); 761 unp->unp_flags |= UNP_HAVEPCCACHED; 762 solisten_proto(so, backlog); 763 } 764 SOCK_UNLOCK(so); 765 UNP_PCB_UNLOCK(unp); 766 return (error); 767 } 768 769 static int 770 uipc_peeraddr(struct socket *so, struct sockaddr **nam) 771 { 772 struct unpcb *unp, *unp2; 773 const struct sockaddr *sa; 774 775 unp = sotounpcb(so); 776 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL")); 777 778 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 779 UNP_LINK_RLOCK(); 780 /* 781 * XXX: It seems that this test always fails even when connection is 782 * established. So, this else clause is added as workaround to 783 * return PF_LOCAL sockaddr. 784 */ 785 unp2 = unp->unp_conn; 786 if (unp2 != NULL) { 787 UNP_PCB_LOCK(unp2); 788 if (unp2->unp_addr != NULL) 789 sa = (struct sockaddr *) unp2->unp_addr; 790 else 791 sa = &sun_noname; 792 bcopy(sa, *nam, sa->sa_len); 793 UNP_PCB_UNLOCK(unp2); 794 } else { 795 sa = &sun_noname; 796 bcopy(sa, *nam, sa->sa_len); 797 } 798 UNP_LINK_RUNLOCK(); 799 return (0); 800 } 801 802 static int 803 uipc_rcvd(struct socket *so, int flags) 804 { 805 struct unpcb *unp, *unp2; 806 struct socket *so2; 807 u_int mbcnt, sbcc; 808 809 unp = sotounpcb(so); 810 KASSERT(unp != NULL, ("%s: unp == NULL", __func__)); 811 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET, 812 ("%s: socktype %d", __func__, so->so_type)); 813 814 /* 815 * Adjust backpressure on sender and wakeup any waiting to write. 816 * 817 * The unp lock is acquired to maintain the validity of the unp_conn 818 * pointer; no lock on unp2 is required as unp2->unp_socket will be 819 * static as long as we don't permit unp2 to disconnect from unp, 820 * which is prevented by the lock on unp. We cache values from 821 * so_rcv to avoid holding the so_rcv lock over the entire 822 * transaction on the remote so_snd. 823 */ 824 SOCKBUF_LOCK(&so->so_rcv); 825 mbcnt = so->so_rcv.sb_mbcnt; 826 sbcc = sbavail(&so->so_rcv); 827 SOCKBUF_UNLOCK(&so->so_rcv); 828 /* 829 * There is a benign race condition at this point. If we're planning to 830 * clear SB_STOP, but uipc_send is called on the connected socket at 831 * this instant, it might add data to the sockbuf and set SB_STOP. Then 832 * we would erroneously clear SB_STOP below, even though the sockbuf is 833 * full. The race is benign because the only ill effect is to allow the 834 * sockbuf to exceed its size limit, and the size limits are not 835 * strictly guaranteed anyway. 836 */ 837 UNP_PCB_LOCK(unp); 838 unp2 = unp->unp_conn; 839 if (unp2 == NULL) { 840 UNP_PCB_UNLOCK(unp); 841 return (0); 842 } 843 so2 = unp2->unp_socket; 844 SOCKBUF_LOCK(&so2->so_snd); 845 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax) 846 so2->so_snd.sb_flags &= ~SB_STOP; 847 sowwakeup_locked(so2); 848 UNP_PCB_UNLOCK(unp); 849 return (0); 850 } 851 852 static int 853 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 854 struct mbuf *control, struct thread *td) 855 { 856 struct unpcb *unp, *unp2; 857 struct socket *so2; 858 u_int mbcnt, sbcc; 859 int error = 0; 860 861 unp = sotounpcb(so); 862 KASSERT(unp != NULL, ("%s: unp == NULL", __func__)); 863 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_DGRAM || 864 so->so_type == SOCK_SEQPACKET, 865 ("%s: socktype %d", __func__, so->so_type)); 866 867 if (flags & PRUS_OOB) { 868 error = EOPNOTSUPP; 869 goto release; 870 } 871 if (control != NULL && (error = unp_internalize(&control, td))) 872 goto release; 873 if ((nam != NULL) || (flags & PRUS_EOF)) 874 UNP_LINK_WLOCK(); 875 else 876 UNP_LINK_RLOCK(); 877 switch (so->so_type) { 878 case SOCK_DGRAM: 879 { 880 const struct sockaddr *from; 881 882 unp2 = unp->unp_conn; 883 if (nam != NULL) { 884 UNP_LINK_WLOCK_ASSERT(); 885 if (unp2 != NULL) { 886 error = EISCONN; 887 break; 888 } 889 error = unp_connect(so, nam, td); 890 if (error) 891 break; 892 unp2 = unp->unp_conn; 893 } 894 895 /* 896 * Because connect() and send() are non-atomic in a sendto() 897 * with a target address, it's possible that the socket will 898 * have disconnected before the send() can run. In that case 899 * return the slightly counter-intuitive but otherwise 900 * correct error that the socket is not connected. 901 */ 902 if (unp2 == NULL) { 903 error = ENOTCONN; 904 break; 905 } 906 /* Lockless read. */ 907 if (unp2->unp_flags & UNP_WANTCRED) 908 control = unp_addsockcred(td, control); 909 UNP_PCB_LOCK(unp); 910 if (unp->unp_addr != NULL) 911 from = (struct sockaddr *)unp->unp_addr; 912 else 913 from = &sun_noname; 914 so2 = unp2->unp_socket; 915 SOCKBUF_LOCK(&so2->so_rcv); 916 if (sbappendaddr_locked(&so2->so_rcv, from, m, 917 control)) { 918 sorwakeup_locked(so2); 919 m = NULL; 920 control = NULL; 921 } else { 922 SOCKBUF_UNLOCK(&so2->so_rcv); 923 error = ENOBUFS; 924 } 925 if (nam != NULL) { 926 UNP_LINK_WLOCK_ASSERT(); 927 UNP_PCB_LOCK(unp2); 928 unp_disconnect(unp, unp2); 929 UNP_PCB_UNLOCK(unp2); 930 } 931 UNP_PCB_UNLOCK(unp); 932 break; 933 } 934 935 case SOCK_SEQPACKET: 936 case SOCK_STREAM: 937 if ((so->so_state & SS_ISCONNECTED) == 0) { 938 if (nam != NULL) { 939 UNP_LINK_WLOCK_ASSERT(); 940 error = unp_connect(so, nam, td); 941 if (error) 942 break; /* XXX */ 943 } else { 944 error = ENOTCONN; 945 break; 946 } 947 } 948 949 /* Lockless read. */ 950 if (so->so_snd.sb_state & SBS_CANTSENDMORE) { 951 error = EPIPE; 952 break; 953 } 954 955 /* 956 * Because connect() and send() are non-atomic in a sendto() 957 * with a target address, it's possible that the socket will 958 * have disconnected before the send() can run. In that case 959 * return the slightly counter-intuitive but otherwise 960 * correct error that the socket is not connected. 961 * 962 * Locking here must be done carefully: the linkage lock 963 * prevents interconnections between unpcbs from changing, so 964 * we can traverse from unp to unp2 without acquiring unp's 965 * lock. Socket buffer locks follow unpcb locks, so we can 966 * acquire both remote and lock socket buffer locks. 967 */ 968 unp2 = unp->unp_conn; 969 if (unp2 == NULL) { 970 error = ENOTCONN; 971 break; 972 } 973 so2 = unp2->unp_socket; 974 UNP_PCB_LOCK(unp2); 975 SOCKBUF_LOCK(&so2->so_rcv); 976 if (unp2->unp_flags & UNP_WANTCRED) { 977 /* 978 * Credentials are passed only once on SOCK_STREAM 979 * and SOCK_SEQPACKET. 980 */ 981 unp2->unp_flags &= ~UNP_WANTCRED; 982 control = unp_addsockcred(td, control); 983 } 984 /* 985 * Send to paired receive port, and then reduce send buffer 986 * hiwater marks to maintain backpressure. Wake up readers. 987 */ 988 switch (so->so_type) { 989 case SOCK_STREAM: 990 if (control != NULL) { 991 if (sbappendcontrol_locked(&so2->so_rcv, m, 992 control)) 993 control = NULL; 994 } else 995 sbappend_locked(&so2->so_rcv, m, flags); 996 break; 997 998 case SOCK_SEQPACKET: { 999 const struct sockaddr *from; 1000 1001 from = &sun_noname; 1002 /* 1003 * Don't check for space available in so2->so_rcv. 1004 * Unix domain sockets only check for space in the 1005 * sending sockbuf, and that check is performed one 1006 * level up the stack. 1007 */ 1008 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv, 1009 from, m, control)) 1010 control = NULL; 1011 break; 1012 } 1013 } 1014 1015 mbcnt = so2->so_rcv.sb_mbcnt; 1016 sbcc = sbavail(&so2->so_rcv); 1017 if (sbcc) 1018 sorwakeup_locked(so2); 1019 else 1020 SOCKBUF_UNLOCK(&so2->so_rcv); 1021 1022 /* 1023 * The PCB lock on unp2 protects the SB_STOP flag. Without it, 1024 * it would be possible for uipc_rcvd to be called at this 1025 * point, drain the receiving sockbuf, clear SB_STOP, and then 1026 * we would set SB_STOP below. That could lead to an empty 1027 * sockbuf having SB_STOP set 1028 */ 1029 SOCKBUF_LOCK(&so->so_snd); 1030 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax) 1031 so->so_snd.sb_flags |= SB_STOP; 1032 SOCKBUF_UNLOCK(&so->so_snd); 1033 UNP_PCB_UNLOCK(unp2); 1034 m = NULL; 1035 break; 1036 } 1037 1038 /* 1039 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown. 1040 */ 1041 if (flags & PRUS_EOF) { 1042 UNP_PCB_LOCK(unp); 1043 socantsendmore(so); 1044 unp_shutdown(unp); 1045 UNP_PCB_UNLOCK(unp); 1046 } 1047 1048 if ((nam != NULL) || (flags & PRUS_EOF)) 1049 UNP_LINK_WUNLOCK(); 1050 else 1051 UNP_LINK_RUNLOCK(); 1052 1053 if (control != NULL && error != 0) 1054 unp_dispose(control); 1055 1056 release: 1057 if (control != NULL) 1058 m_freem(control); 1059 /* 1060 * In case of PRUS_NOTREADY, uipc_ready() is responsible 1061 * for freeing memory. 1062 */ 1063 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 1064 m_freem(m); 1065 return (error); 1066 } 1067 1068 static int 1069 uipc_ready(struct socket *so, struct mbuf *m, int count) 1070 { 1071 struct unpcb *unp, *unp2; 1072 struct socket *so2; 1073 int error; 1074 1075 unp = sotounpcb(so); 1076 1077 UNP_LINK_RLOCK(); 1078 if ((unp2 = unp->unp_conn) == NULL) { 1079 UNP_LINK_RUNLOCK(); 1080 for (int i = 0; i < count; i++) 1081 m = m_free(m); 1082 return (ECONNRESET); 1083 } 1084 UNP_PCB_LOCK(unp2); 1085 so2 = unp2->unp_socket; 1086 1087 SOCKBUF_LOCK(&so2->so_rcv); 1088 if ((error = sbready(&so2->so_rcv, m, count)) == 0) 1089 sorwakeup_locked(so2); 1090 else 1091 SOCKBUF_UNLOCK(&so2->so_rcv); 1092 1093 UNP_PCB_UNLOCK(unp2); 1094 UNP_LINK_RUNLOCK(); 1095 1096 return (error); 1097 } 1098 1099 static int 1100 uipc_sense(struct socket *so, struct stat *sb) 1101 { 1102 struct unpcb *unp; 1103 1104 unp = sotounpcb(so); 1105 KASSERT(unp != NULL, ("uipc_sense: unp == NULL")); 1106 1107 sb->st_blksize = so->so_snd.sb_hiwat; 1108 UNP_PCB_LOCK(unp); 1109 sb->st_dev = NODEV; 1110 if (unp->unp_ino == 0) 1111 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 1112 sb->st_ino = unp->unp_ino; 1113 UNP_PCB_UNLOCK(unp); 1114 return (0); 1115 } 1116 1117 static int 1118 uipc_shutdown(struct socket *so) 1119 { 1120 struct unpcb *unp; 1121 1122 unp = sotounpcb(so); 1123 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL")); 1124 1125 UNP_LINK_WLOCK(); 1126 UNP_PCB_LOCK(unp); 1127 socantsendmore(so); 1128 unp_shutdown(unp); 1129 UNP_PCB_UNLOCK(unp); 1130 UNP_LINK_WUNLOCK(); 1131 return (0); 1132 } 1133 1134 static int 1135 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 1136 { 1137 struct unpcb *unp; 1138 const struct sockaddr *sa; 1139 1140 unp = sotounpcb(so); 1141 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL")); 1142 1143 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 1144 UNP_PCB_LOCK(unp); 1145 if (unp->unp_addr != NULL) 1146 sa = (struct sockaddr *) unp->unp_addr; 1147 else 1148 sa = &sun_noname; 1149 bcopy(sa, *nam, sa->sa_len); 1150 UNP_PCB_UNLOCK(unp); 1151 return (0); 1152 } 1153 1154 static struct pr_usrreqs uipc_usrreqs_dgram = { 1155 .pru_abort = uipc_abort, 1156 .pru_accept = uipc_accept, 1157 .pru_attach = uipc_attach, 1158 .pru_bind = uipc_bind, 1159 .pru_bindat = uipc_bindat, 1160 .pru_connect = uipc_connect, 1161 .pru_connectat = uipc_connectat, 1162 .pru_connect2 = uipc_connect2, 1163 .pru_detach = uipc_detach, 1164 .pru_disconnect = uipc_disconnect, 1165 .pru_listen = uipc_listen, 1166 .pru_peeraddr = uipc_peeraddr, 1167 .pru_rcvd = uipc_rcvd, 1168 .pru_send = uipc_send, 1169 .pru_sense = uipc_sense, 1170 .pru_shutdown = uipc_shutdown, 1171 .pru_sockaddr = uipc_sockaddr, 1172 .pru_soreceive = soreceive_dgram, 1173 .pru_close = uipc_close, 1174 }; 1175 1176 static struct pr_usrreqs uipc_usrreqs_seqpacket = { 1177 .pru_abort = uipc_abort, 1178 .pru_accept = uipc_accept, 1179 .pru_attach = uipc_attach, 1180 .pru_bind = uipc_bind, 1181 .pru_bindat = uipc_bindat, 1182 .pru_connect = uipc_connect, 1183 .pru_connectat = uipc_connectat, 1184 .pru_connect2 = uipc_connect2, 1185 .pru_detach = uipc_detach, 1186 .pru_disconnect = uipc_disconnect, 1187 .pru_listen = uipc_listen, 1188 .pru_peeraddr = uipc_peeraddr, 1189 .pru_rcvd = uipc_rcvd, 1190 .pru_send = uipc_send, 1191 .pru_sense = uipc_sense, 1192 .pru_shutdown = uipc_shutdown, 1193 .pru_sockaddr = uipc_sockaddr, 1194 .pru_soreceive = soreceive_generic, /* XXX: or...? */ 1195 .pru_close = uipc_close, 1196 }; 1197 1198 static struct pr_usrreqs uipc_usrreqs_stream = { 1199 .pru_abort = uipc_abort, 1200 .pru_accept = uipc_accept, 1201 .pru_attach = uipc_attach, 1202 .pru_bind = uipc_bind, 1203 .pru_bindat = uipc_bindat, 1204 .pru_connect = uipc_connect, 1205 .pru_connectat = uipc_connectat, 1206 .pru_connect2 = uipc_connect2, 1207 .pru_detach = uipc_detach, 1208 .pru_disconnect = uipc_disconnect, 1209 .pru_listen = uipc_listen, 1210 .pru_peeraddr = uipc_peeraddr, 1211 .pru_rcvd = uipc_rcvd, 1212 .pru_send = uipc_send, 1213 .pru_ready = uipc_ready, 1214 .pru_sense = uipc_sense, 1215 .pru_shutdown = uipc_shutdown, 1216 .pru_sockaddr = uipc_sockaddr, 1217 .pru_soreceive = soreceive_generic, 1218 .pru_close = uipc_close, 1219 }; 1220 1221 static int 1222 uipc_ctloutput(struct socket *so, struct sockopt *sopt) 1223 { 1224 struct unpcb *unp; 1225 struct xucred xu; 1226 int error, optval; 1227 1228 if (sopt->sopt_level != 0) 1229 return (EINVAL); 1230 1231 unp = sotounpcb(so); 1232 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL")); 1233 error = 0; 1234 switch (sopt->sopt_dir) { 1235 case SOPT_GET: 1236 switch (sopt->sopt_name) { 1237 case LOCAL_PEERCRED: 1238 UNP_PCB_LOCK(unp); 1239 if (unp->unp_flags & UNP_HAVEPC) 1240 xu = unp->unp_peercred; 1241 else { 1242 if (so->so_type == SOCK_STREAM) 1243 error = ENOTCONN; 1244 else 1245 error = EINVAL; 1246 } 1247 UNP_PCB_UNLOCK(unp); 1248 if (error == 0) 1249 error = sooptcopyout(sopt, &xu, sizeof(xu)); 1250 break; 1251 1252 case LOCAL_CREDS: 1253 /* Unlocked read. */ 1254 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0; 1255 error = sooptcopyout(sopt, &optval, sizeof(optval)); 1256 break; 1257 1258 case LOCAL_CONNWAIT: 1259 /* Unlocked read. */ 1260 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0; 1261 error = sooptcopyout(sopt, &optval, sizeof(optval)); 1262 break; 1263 1264 default: 1265 error = EOPNOTSUPP; 1266 break; 1267 } 1268 break; 1269 1270 case SOPT_SET: 1271 switch (sopt->sopt_name) { 1272 case LOCAL_CREDS: 1273 case LOCAL_CONNWAIT: 1274 error = sooptcopyin(sopt, &optval, sizeof(optval), 1275 sizeof(optval)); 1276 if (error) 1277 break; 1278 1279 #define OPTSET(bit) do { \ 1280 UNP_PCB_LOCK(unp); \ 1281 if (optval) \ 1282 unp->unp_flags |= bit; \ 1283 else \ 1284 unp->unp_flags &= ~bit; \ 1285 UNP_PCB_UNLOCK(unp); \ 1286 } while (0) 1287 1288 switch (sopt->sopt_name) { 1289 case LOCAL_CREDS: 1290 OPTSET(UNP_WANTCRED); 1291 break; 1292 1293 case LOCAL_CONNWAIT: 1294 OPTSET(UNP_CONNWAIT); 1295 break; 1296 1297 default: 1298 break; 1299 } 1300 break; 1301 #undef OPTSET 1302 default: 1303 error = ENOPROTOOPT; 1304 break; 1305 } 1306 break; 1307 1308 default: 1309 error = EOPNOTSUPP; 1310 break; 1311 } 1312 return (error); 1313 } 1314 1315 static int 1316 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1317 { 1318 1319 return (unp_connectat(AT_FDCWD, so, nam, td)); 1320 } 1321 1322 static int 1323 unp_connectat(int fd, struct socket *so, struct sockaddr *nam, 1324 struct thread *td) 1325 { 1326 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 1327 struct vnode *vp; 1328 struct socket *so2, *so3; 1329 struct unpcb *unp, *unp2, *unp3; 1330 struct nameidata nd; 1331 char buf[SOCK_MAXADDRLEN]; 1332 struct sockaddr *sa; 1333 cap_rights_t rights; 1334 int error, len; 1335 1336 if (nam->sa_family != AF_UNIX) 1337 return (EAFNOSUPPORT); 1338 1339 UNP_LINK_WLOCK_ASSERT(); 1340 1341 unp = sotounpcb(so); 1342 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1343 1344 if (nam->sa_len > sizeof(struct sockaddr_un)) 1345 return (EINVAL); 1346 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 1347 if (len <= 0) 1348 return (EINVAL); 1349 bcopy(soun->sun_path, buf, len); 1350 buf[len] = 0; 1351 1352 UNP_PCB_LOCK(unp); 1353 if (unp->unp_flags & UNP_CONNECTING) { 1354 UNP_PCB_UNLOCK(unp); 1355 return (EALREADY); 1356 } 1357 UNP_LINK_WUNLOCK(); 1358 unp->unp_flags |= UNP_CONNECTING; 1359 UNP_PCB_UNLOCK(unp); 1360 1361 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 1362 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, 1363 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td); 1364 error = namei(&nd); 1365 if (error) 1366 vp = NULL; 1367 else 1368 vp = nd.ni_vp; 1369 ASSERT_VOP_LOCKED(vp, "unp_connect"); 1370 NDFREE(&nd, NDF_ONLY_PNBUF); 1371 if (error) 1372 goto bad; 1373 1374 if (vp->v_type != VSOCK) { 1375 error = ENOTSOCK; 1376 goto bad; 1377 } 1378 #ifdef MAC 1379 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD); 1380 if (error) 1381 goto bad; 1382 #endif 1383 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 1384 if (error) 1385 goto bad; 1386 1387 unp = sotounpcb(so); 1388 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1389 1390 /* 1391 * Lock linkage lock for two reasons: make sure v_socket is stable, 1392 * and to protect simultaneous locking of multiple pcbs. 1393 */ 1394 UNP_LINK_WLOCK(); 1395 VOP_UNP_CONNECT(vp, &so2); 1396 if (so2 == NULL) { 1397 error = ECONNREFUSED; 1398 goto bad2; 1399 } 1400 if (so->so_type != so2->so_type) { 1401 error = EPROTOTYPE; 1402 goto bad2; 1403 } 1404 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 1405 if (so2->so_options & SO_ACCEPTCONN) { 1406 CURVNET_SET(so2->so_vnet); 1407 so3 = sonewconn(so2, 0); 1408 CURVNET_RESTORE(); 1409 } else 1410 so3 = NULL; 1411 if (so3 == NULL) { 1412 error = ECONNREFUSED; 1413 goto bad2; 1414 } 1415 unp = sotounpcb(so); 1416 unp2 = sotounpcb(so2); 1417 unp3 = sotounpcb(so3); 1418 UNP_PCB_LOCK(unp); 1419 UNP_PCB_LOCK(unp2); 1420 UNP_PCB_LOCK(unp3); 1421 if (unp2->unp_addr != NULL) { 1422 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len); 1423 unp3->unp_addr = (struct sockaddr_un *) sa; 1424 sa = NULL; 1425 } 1426 1427 /* 1428 * The connector's (client's) credentials are copied from its 1429 * process structure at the time of connect() (which is now). 1430 */ 1431 cru2x(td->td_ucred, &unp3->unp_peercred); 1432 unp3->unp_flags |= UNP_HAVEPC; 1433 1434 /* 1435 * The receiver's (server's) credentials are copied from the 1436 * unp_peercred member of socket on which the former called 1437 * listen(); uipc_listen() cached that process's credentials 1438 * at that time so we can use them now. 1439 */ 1440 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 1441 ("unp_connect: listener without cached peercred")); 1442 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 1443 sizeof(unp->unp_peercred)); 1444 unp->unp_flags |= UNP_HAVEPC; 1445 if (unp2->unp_flags & UNP_WANTCRED) 1446 unp3->unp_flags |= UNP_WANTCRED; 1447 UNP_PCB_UNLOCK(unp3); 1448 UNP_PCB_UNLOCK(unp2); 1449 UNP_PCB_UNLOCK(unp); 1450 #ifdef MAC 1451 mac_socketpeer_set_from_socket(so, so3); 1452 mac_socketpeer_set_from_socket(so3, so); 1453 #endif 1454 1455 so2 = so3; 1456 } 1457 unp = sotounpcb(so); 1458 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1459 unp2 = sotounpcb(so2); 1460 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL")); 1461 UNP_PCB_LOCK(unp); 1462 UNP_PCB_LOCK(unp2); 1463 error = unp_connect2(so, so2, PRU_CONNECT); 1464 UNP_PCB_UNLOCK(unp2); 1465 UNP_PCB_UNLOCK(unp); 1466 bad2: 1467 UNP_LINK_WUNLOCK(); 1468 bad: 1469 if (vp != NULL) 1470 vput(vp); 1471 free(sa, M_SONAME); 1472 UNP_LINK_WLOCK(); 1473 UNP_PCB_LOCK(unp); 1474 unp->unp_flags &= ~UNP_CONNECTING; 1475 UNP_PCB_UNLOCK(unp); 1476 return (error); 1477 } 1478 1479 static int 1480 unp_connect2(struct socket *so, struct socket *so2, int req) 1481 { 1482 struct unpcb *unp; 1483 struct unpcb *unp2; 1484 1485 unp = sotounpcb(so); 1486 KASSERT(unp != NULL, ("unp_connect2: unp == NULL")); 1487 unp2 = sotounpcb(so2); 1488 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL")); 1489 1490 UNP_LINK_WLOCK_ASSERT(); 1491 UNP_PCB_LOCK_ASSERT(unp); 1492 UNP_PCB_LOCK_ASSERT(unp2); 1493 1494 if (so2->so_type != so->so_type) 1495 return (EPROTOTYPE); 1496 unp2->unp_flags &= ~UNP_NASCENT; 1497 unp->unp_conn = unp2; 1498 1499 switch (so->so_type) { 1500 case SOCK_DGRAM: 1501 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 1502 soisconnected(so); 1503 break; 1504 1505 case SOCK_STREAM: 1506 case SOCK_SEQPACKET: 1507 unp2->unp_conn = unp; 1508 if (req == PRU_CONNECT && 1509 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT)) 1510 soisconnecting(so); 1511 else 1512 soisconnected(so); 1513 soisconnected(so2); 1514 break; 1515 1516 default: 1517 panic("unp_connect2"); 1518 } 1519 return (0); 1520 } 1521 1522 static void 1523 unp_disconnect(struct unpcb *unp, struct unpcb *unp2) 1524 { 1525 struct socket *so; 1526 1527 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL")); 1528 1529 UNP_LINK_WLOCK_ASSERT(); 1530 UNP_PCB_LOCK_ASSERT(unp); 1531 UNP_PCB_LOCK_ASSERT(unp2); 1532 1533 unp->unp_conn = NULL; 1534 switch (unp->unp_socket->so_type) { 1535 case SOCK_DGRAM: 1536 LIST_REMOVE(unp, unp_reflink); 1537 so = unp->unp_socket; 1538 SOCK_LOCK(so); 1539 so->so_state &= ~SS_ISCONNECTED; 1540 SOCK_UNLOCK(so); 1541 break; 1542 1543 case SOCK_STREAM: 1544 case SOCK_SEQPACKET: 1545 soisdisconnected(unp->unp_socket); 1546 unp2->unp_conn = NULL; 1547 soisdisconnected(unp2->unp_socket); 1548 break; 1549 } 1550 } 1551 1552 /* 1553 * unp_pcblist() walks the global list of struct unpcb's to generate a 1554 * pointer list, bumping the refcount on each unpcb. It then copies them out 1555 * sequentially, validating the generation number on each to see if it has 1556 * been detached. All of this is necessary because copyout() may sleep on 1557 * disk I/O. 1558 */ 1559 static int 1560 unp_pcblist(SYSCTL_HANDLER_ARGS) 1561 { 1562 int error, i, n; 1563 int freeunp; 1564 struct unpcb *unp, **unp_list; 1565 unp_gen_t gencnt; 1566 struct xunpgen *xug; 1567 struct unp_head *head; 1568 struct xunpcb *xu; 1569 1570 switch ((intptr_t)arg1) { 1571 case SOCK_STREAM: 1572 head = &unp_shead; 1573 break; 1574 1575 case SOCK_DGRAM: 1576 head = &unp_dhead; 1577 break; 1578 1579 case SOCK_SEQPACKET: 1580 head = &unp_sphead; 1581 break; 1582 1583 default: 1584 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1); 1585 } 1586 1587 /* 1588 * The process of preparing the PCB list is too time-consuming and 1589 * resource-intensive to repeat twice on every request. 1590 */ 1591 if (req->oldptr == NULL) { 1592 n = unp_count; 1593 req->oldidx = 2 * (sizeof *xug) 1594 + (n + n/8) * sizeof(struct xunpcb); 1595 return (0); 1596 } 1597 1598 if (req->newptr != NULL) 1599 return (EPERM); 1600 1601 /* 1602 * OK, now we're committed to doing something. 1603 */ 1604 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 1605 UNP_LIST_LOCK(); 1606 gencnt = unp_gencnt; 1607 n = unp_count; 1608 UNP_LIST_UNLOCK(); 1609 1610 xug->xug_len = sizeof *xug; 1611 xug->xug_count = n; 1612 xug->xug_gen = gencnt; 1613 xug->xug_sogen = so_gencnt; 1614 error = SYSCTL_OUT(req, xug, sizeof *xug); 1615 if (error) { 1616 free(xug, M_TEMP); 1617 return (error); 1618 } 1619 1620 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 1621 1622 UNP_LIST_LOCK(); 1623 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 1624 unp = LIST_NEXT(unp, unp_link)) { 1625 UNP_PCB_LOCK(unp); 1626 if (unp->unp_gencnt <= gencnt) { 1627 if (cr_cansee(req->td->td_ucred, 1628 unp->unp_socket->so_cred)) { 1629 UNP_PCB_UNLOCK(unp); 1630 continue; 1631 } 1632 unp_list[i++] = unp; 1633 unp->unp_refcount++; 1634 } 1635 UNP_PCB_UNLOCK(unp); 1636 } 1637 UNP_LIST_UNLOCK(); 1638 n = i; /* In case we lost some during malloc. */ 1639 1640 error = 0; 1641 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO); 1642 for (i = 0; i < n; i++) { 1643 unp = unp_list[i]; 1644 UNP_PCB_LOCK(unp); 1645 unp->unp_refcount--; 1646 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) { 1647 xu->xu_len = sizeof *xu; 1648 xu->xu_unpp = unp; 1649 /* 1650 * XXX - need more locking here to protect against 1651 * connect/disconnect races for SMP. 1652 */ 1653 if (unp->unp_addr != NULL) 1654 bcopy(unp->unp_addr, &xu->xu_addr, 1655 unp->unp_addr->sun_len); 1656 if (unp->unp_conn != NULL && 1657 unp->unp_conn->unp_addr != NULL) 1658 bcopy(unp->unp_conn->unp_addr, 1659 &xu->xu_caddr, 1660 unp->unp_conn->unp_addr->sun_len); 1661 bcopy(unp, &xu->xu_unp, sizeof *unp); 1662 sotoxsocket(unp->unp_socket, &xu->xu_socket); 1663 UNP_PCB_UNLOCK(unp); 1664 error = SYSCTL_OUT(req, xu, sizeof *xu); 1665 } else { 1666 freeunp = (unp->unp_refcount == 0); 1667 UNP_PCB_UNLOCK(unp); 1668 if (freeunp) { 1669 UNP_PCB_LOCK_DESTROY(unp); 1670 uma_zfree(unp_zone, unp); 1671 } 1672 } 1673 } 1674 free(xu, M_TEMP); 1675 if (!error) { 1676 /* 1677 * Give the user an updated idea of our state. If the 1678 * generation differs from what we told her before, she knows 1679 * that something happened while we were processing this 1680 * request, and it might be necessary to retry. 1681 */ 1682 xug->xug_gen = unp_gencnt; 1683 xug->xug_sogen = so_gencnt; 1684 xug->xug_count = unp_count; 1685 error = SYSCTL_OUT(req, xug, sizeof *xug); 1686 } 1687 free(unp_list, M_TEMP); 1688 free(xug, M_TEMP); 1689 return (error); 1690 } 1691 1692 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD, 1693 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 1694 "List of active local datagram sockets"); 1695 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD, 1696 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 1697 "List of active local stream sockets"); 1698 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist, 1699 CTLTYPE_OPAQUE | CTLFLAG_RD, 1700 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb", 1701 "List of active local seqpacket sockets"); 1702 1703 static void 1704 unp_shutdown(struct unpcb *unp) 1705 { 1706 struct unpcb *unp2; 1707 struct socket *so; 1708 1709 UNP_LINK_WLOCK_ASSERT(); 1710 UNP_PCB_LOCK_ASSERT(unp); 1711 1712 unp2 = unp->unp_conn; 1713 if ((unp->unp_socket->so_type == SOCK_STREAM || 1714 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) { 1715 so = unp2->unp_socket; 1716 if (so != NULL) 1717 socantrcvmore(so); 1718 } 1719 } 1720 1721 static void 1722 unp_drop(struct unpcb *unp) 1723 { 1724 struct socket *so = unp->unp_socket; 1725 struct unpcb *unp2; 1726 1727 UNP_LINK_WLOCK_ASSERT(); 1728 UNP_PCB_LOCK_ASSERT(unp); 1729 1730 /* 1731 * Regardless of whether the socket's peer dropped the connection 1732 * with this socket by aborting or disconnecting, POSIX requires 1733 * that ECONNRESET is returned. 1734 */ 1735 so->so_error = ECONNRESET; 1736 unp2 = unp->unp_conn; 1737 if (unp2 == NULL) 1738 return; 1739 UNP_PCB_LOCK(unp2); 1740 unp_disconnect(unp, unp2); 1741 UNP_PCB_UNLOCK(unp2); 1742 } 1743 1744 static void 1745 unp_freerights(struct filedescent **fdep, int fdcount) 1746 { 1747 struct file *fp; 1748 int i; 1749 1750 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount)); 1751 1752 for (i = 0; i < fdcount; i++) { 1753 fp = fdep[i]->fde_file; 1754 filecaps_free(&fdep[i]->fde_caps); 1755 unp_discard(fp); 1756 } 1757 free(fdep[0], M_FILECAPS); 1758 } 1759 1760 static int 1761 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags) 1762 { 1763 struct thread *td = curthread; /* XXX */ 1764 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1765 int i; 1766 int *fdp; 1767 struct filedesc *fdesc = td->td_proc->p_fd; 1768 struct filedescent **fdep; 1769 void *data; 1770 socklen_t clen = control->m_len, datalen; 1771 int error, newfds; 1772 u_int newlen; 1773 1774 UNP_LINK_UNLOCK_ASSERT(); 1775 1776 error = 0; 1777 if (controlp != NULL) /* controlp == NULL => free control messages */ 1778 *controlp = NULL; 1779 while (cm != NULL) { 1780 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 1781 error = EINVAL; 1782 break; 1783 } 1784 data = CMSG_DATA(cm); 1785 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1786 if (cm->cmsg_level == SOL_SOCKET 1787 && cm->cmsg_type == SCM_RIGHTS) { 1788 newfds = datalen / sizeof(*fdep); 1789 if (newfds == 0) 1790 goto next; 1791 fdep = data; 1792 1793 /* If we're not outputting the descriptors free them. */ 1794 if (error || controlp == NULL) { 1795 unp_freerights(fdep, newfds); 1796 goto next; 1797 } 1798 FILEDESC_XLOCK(fdesc); 1799 1800 /* 1801 * Now change each pointer to an fd in the global 1802 * table to an integer that is the index to the local 1803 * fd table entry that we set up to point to the 1804 * global one we are transferring. 1805 */ 1806 newlen = newfds * sizeof(int); 1807 *controlp = sbcreatecontrol(NULL, newlen, 1808 SCM_RIGHTS, SOL_SOCKET); 1809 if (*controlp == NULL) { 1810 FILEDESC_XUNLOCK(fdesc); 1811 error = E2BIG; 1812 unp_freerights(fdep, newfds); 1813 goto next; 1814 } 1815 1816 fdp = (int *) 1817 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1818 if (fdallocn(td, 0, fdp, newfds) != 0) { 1819 FILEDESC_XUNLOCK(fdesc); 1820 error = EMSGSIZE; 1821 unp_freerights(fdep, newfds); 1822 m_freem(*controlp); 1823 *controlp = NULL; 1824 goto next; 1825 } 1826 for (i = 0; i < newfds; i++, fdp++) { 1827 _finstall(fdesc, fdep[i]->fde_file, *fdp, 1828 (flags & MSG_CMSG_CLOEXEC) != 0 ? UF_EXCLOSE : 0, 1829 &fdep[i]->fde_caps); 1830 unp_externalize_fp(fdep[i]->fde_file); 1831 } 1832 FILEDESC_XUNLOCK(fdesc); 1833 free(fdep[0], M_FILECAPS); 1834 } else { 1835 /* We can just copy anything else across. */ 1836 if (error || controlp == NULL) 1837 goto next; 1838 *controlp = sbcreatecontrol(NULL, datalen, 1839 cm->cmsg_type, cm->cmsg_level); 1840 if (*controlp == NULL) { 1841 error = ENOBUFS; 1842 goto next; 1843 } 1844 bcopy(data, 1845 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1846 datalen); 1847 } 1848 controlp = &(*controlp)->m_next; 1849 1850 next: 1851 if (CMSG_SPACE(datalen) < clen) { 1852 clen -= CMSG_SPACE(datalen); 1853 cm = (struct cmsghdr *) 1854 ((caddr_t)cm + CMSG_SPACE(datalen)); 1855 } else { 1856 clen = 0; 1857 cm = NULL; 1858 } 1859 } 1860 1861 m_freem(control); 1862 return (error); 1863 } 1864 1865 static void 1866 unp_zone_change(void *tag) 1867 { 1868 1869 uma_zone_set_max(unp_zone, maxsockets); 1870 } 1871 1872 static void 1873 unp_init(void) 1874 { 1875 1876 #ifdef VIMAGE 1877 if (!IS_DEFAULT_VNET(curvnet)) 1878 return; 1879 #endif 1880 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1881 NULL, NULL, UMA_ALIGN_PTR, 0); 1882 if (unp_zone == NULL) 1883 panic("unp_init"); 1884 uma_zone_set_max(unp_zone, maxsockets); 1885 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached"); 1886 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change, 1887 NULL, EVENTHANDLER_PRI_ANY); 1888 LIST_INIT(&unp_dhead); 1889 LIST_INIT(&unp_shead); 1890 LIST_INIT(&unp_sphead); 1891 SLIST_INIT(&unp_defers); 1892 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL); 1893 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL); 1894 UNP_LINK_LOCK_INIT(); 1895 UNP_LIST_LOCK_INIT(); 1896 UNP_DEFERRED_LOCK_INIT(); 1897 } 1898 1899 static int 1900 unp_internalize(struct mbuf **controlp, struct thread *td) 1901 { 1902 struct mbuf *control = *controlp; 1903 struct proc *p = td->td_proc; 1904 struct filedesc *fdesc = p->p_fd; 1905 struct bintime *bt; 1906 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1907 struct cmsgcred *cmcred; 1908 struct filedescent *fde, **fdep, *fdev; 1909 struct file *fp; 1910 struct timeval *tv; 1911 int i, *fdp; 1912 void *data; 1913 socklen_t clen = control->m_len, datalen; 1914 int error, oldfds; 1915 u_int newlen; 1916 1917 UNP_LINK_UNLOCK_ASSERT(); 1918 1919 error = 0; 1920 *controlp = NULL; 1921 while (cm != NULL) { 1922 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1923 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) { 1924 error = EINVAL; 1925 goto out; 1926 } 1927 data = CMSG_DATA(cm); 1928 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1929 1930 switch (cm->cmsg_type) { 1931 /* 1932 * Fill in credential information. 1933 */ 1934 case SCM_CREDS: 1935 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1936 SCM_CREDS, SOL_SOCKET); 1937 if (*controlp == NULL) { 1938 error = ENOBUFS; 1939 goto out; 1940 } 1941 cmcred = (struct cmsgcred *) 1942 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1943 cmcred->cmcred_pid = p->p_pid; 1944 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1945 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1946 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1947 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1948 CMGROUP_MAX); 1949 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1950 cmcred->cmcred_groups[i] = 1951 td->td_ucred->cr_groups[i]; 1952 break; 1953 1954 case SCM_RIGHTS: 1955 oldfds = datalen / sizeof (int); 1956 if (oldfds == 0) 1957 break; 1958 /* 1959 * Check that all the FDs passed in refer to legal 1960 * files. If not, reject the entire operation. 1961 */ 1962 fdp = data; 1963 FILEDESC_SLOCK(fdesc); 1964 for (i = 0; i < oldfds; i++, fdp++) { 1965 fp = fget_locked(fdesc, *fdp); 1966 if (fp == NULL) { 1967 FILEDESC_SUNLOCK(fdesc); 1968 error = EBADF; 1969 goto out; 1970 } 1971 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) { 1972 FILEDESC_SUNLOCK(fdesc); 1973 error = EOPNOTSUPP; 1974 goto out; 1975 } 1976 1977 } 1978 1979 /* 1980 * Now replace the integer FDs with pointers to the 1981 * file structure and capability rights. 1982 */ 1983 newlen = oldfds * sizeof(fdep[0]); 1984 *controlp = sbcreatecontrol(NULL, newlen, 1985 SCM_RIGHTS, SOL_SOCKET); 1986 if (*controlp == NULL) { 1987 FILEDESC_SUNLOCK(fdesc); 1988 error = E2BIG; 1989 goto out; 1990 } 1991 fdp = data; 1992 fdep = (struct filedescent **) 1993 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1994 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS, 1995 M_WAITOK); 1996 for (i = 0; i < oldfds; i++, fdev++, fdp++) { 1997 fde = &fdesc->fd_ofiles[*fdp]; 1998 fdep[i] = fdev; 1999 fdep[i]->fde_file = fde->fde_file; 2000 filecaps_copy(&fde->fde_caps, 2001 &fdep[i]->fde_caps, true); 2002 unp_internalize_fp(fdep[i]->fde_file); 2003 } 2004 FILEDESC_SUNLOCK(fdesc); 2005 break; 2006 2007 case SCM_TIMESTAMP: 2008 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 2009 SCM_TIMESTAMP, SOL_SOCKET); 2010 if (*controlp == NULL) { 2011 error = ENOBUFS; 2012 goto out; 2013 } 2014 tv = (struct timeval *) 2015 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 2016 microtime(tv); 2017 break; 2018 2019 case SCM_BINTIME: 2020 *controlp = sbcreatecontrol(NULL, sizeof(*bt), 2021 SCM_BINTIME, SOL_SOCKET); 2022 if (*controlp == NULL) { 2023 error = ENOBUFS; 2024 goto out; 2025 } 2026 bt = (struct bintime *) 2027 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 2028 bintime(bt); 2029 break; 2030 2031 default: 2032 error = EINVAL; 2033 goto out; 2034 } 2035 2036 controlp = &(*controlp)->m_next; 2037 if (CMSG_SPACE(datalen) < clen) { 2038 clen -= CMSG_SPACE(datalen); 2039 cm = (struct cmsghdr *) 2040 ((caddr_t)cm + CMSG_SPACE(datalen)); 2041 } else { 2042 clen = 0; 2043 cm = NULL; 2044 } 2045 } 2046 2047 out: 2048 m_freem(control); 2049 return (error); 2050 } 2051 2052 static struct mbuf * 2053 unp_addsockcred(struct thread *td, struct mbuf *control) 2054 { 2055 struct mbuf *m, *n, *n_prev; 2056 struct sockcred *sc; 2057 const struct cmsghdr *cm; 2058 int ngroups; 2059 int i; 2060 2061 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX); 2062 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET); 2063 if (m == NULL) 2064 return (control); 2065 2066 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *)); 2067 sc->sc_uid = td->td_ucred->cr_ruid; 2068 sc->sc_euid = td->td_ucred->cr_uid; 2069 sc->sc_gid = td->td_ucred->cr_rgid; 2070 sc->sc_egid = td->td_ucred->cr_gid; 2071 sc->sc_ngroups = ngroups; 2072 for (i = 0; i < sc->sc_ngroups; i++) 2073 sc->sc_groups[i] = td->td_ucred->cr_groups[i]; 2074 2075 /* 2076 * Unlink SCM_CREDS control messages (struct cmsgcred), since just 2077 * created SCM_CREDS control message (struct sockcred) has another 2078 * format. 2079 */ 2080 if (control != NULL) 2081 for (n = control, n_prev = NULL; n != NULL;) { 2082 cm = mtod(n, struct cmsghdr *); 2083 if (cm->cmsg_level == SOL_SOCKET && 2084 cm->cmsg_type == SCM_CREDS) { 2085 if (n_prev == NULL) 2086 control = n->m_next; 2087 else 2088 n_prev->m_next = n->m_next; 2089 n = m_free(n); 2090 } else { 2091 n_prev = n; 2092 n = n->m_next; 2093 } 2094 } 2095 2096 /* Prepend it to the head. */ 2097 m->m_next = control; 2098 return (m); 2099 } 2100 2101 static struct unpcb * 2102 fptounp(struct file *fp) 2103 { 2104 struct socket *so; 2105 2106 if (fp->f_type != DTYPE_SOCKET) 2107 return (NULL); 2108 if ((so = fp->f_data) == NULL) 2109 return (NULL); 2110 if (so->so_proto->pr_domain != &localdomain) 2111 return (NULL); 2112 return sotounpcb(so); 2113 } 2114 2115 static void 2116 unp_discard(struct file *fp) 2117 { 2118 struct unp_defer *dr; 2119 2120 if (unp_externalize_fp(fp)) { 2121 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK); 2122 dr->ud_fp = fp; 2123 UNP_DEFERRED_LOCK(); 2124 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link); 2125 UNP_DEFERRED_UNLOCK(); 2126 atomic_add_int(&unp_defers_count, 1); 2127 taskqueue_enqueue(taskqueue_thread, &unp_defer_task); 2128 } else 2129 (void) closef(fp, (struct thread *)NULL); 2130 } 2131 2132 static void 2133 unp_process_defers(void *arg __unused, int pending) 2134 { 2135 struct unp_defer *dr; 2136 SLIST_HEAD(, unp_defer) drl; 2137 int count; 2138 2139 SLIST_INIT(&drl); 2140 for (;;) { 2141 UNP_DEFERRED_LOCK(); 2142 if (SLIST_FIRST(&unp_defers) == NULL) { 2143 UNP_DEFERRED_UNLOCK(); 2144 break; 2145 } 2146 SLIST_SWAP(&unp_defers, &drl, unp_defer); 2147 UNP_DEFERRED_UNLOCK(); 2148 count = 0; 2149 while ((dr = SLIST_FIRST(&drl)) != NULL) { 2150 SLIST_REMOVE_HEAD(&drl, ud_link); 2151 closef(dr->ud_fp, NULL); 2152 free(dr, M_TEMP); 2153 count++; 2154 } 2155 atomic_add_int(&unp_defers_count, -count); 2156 } 2157 } 2158 2159 static void 2160 unp_internalize_fp(struct file *fp) 2161 { 2162 struct unpcb *unp; 2163 2164 UNP_LINK_WLOCK(); 2165 if ((unp = fptounp(fp)) != NULL) { 2166 unp->unp_file = fp; 2167 unp->unp_msgcount++; 2168 } 2169 fhold(fp); 2170 unp_rights++; 2171 UNP_LINK_WUNLOCK(); 2172 } 2173 2174 static int 2175 unp_externalize_fp(struct file *fp) 2176 { 2177 struct unpcb *unp; 2178 int ret; 2179 2180 UNP_LINK_WLOCK(); 2181 if ((unp = fptounp(fp)) != NULL) { 2182 unp->unp_msgcount--; 2183 ret = 1; 2184 } else 2185 ret = 0; 2186 unp_rights--; 2187 UNP_LINK_WUNLOCK(); 2188 return (ret); 2189 } 2190 2191 /* 2192 * unp_defer indicates whether additional work has been defered for a future 2193 * pass through unp_gc(). It is thread local and does not require explicit 2194 * synchronization. 2195 */ 2196 static int unp_marked; 2197 static int unp_unreachable; 2198 2199 static void 2200 unp_accessable(struct filedescent **fdep, int fdcount) 2201 { 2202 struct unpcb *unp; 2203 struct file *fp; 2204 int i; 2205 2206 for (i = 0; i < fdcount; i++) { 2207 fp = fdep[i]->fde_file; 2208 if ((unp = fptounp(fp)) == NULL) 2209 continue; 2210 if (unp->unp_gcflag & UNPGC_REF) 2211 continue; 2212 unp->unp_gcflag &= ~UNPGC_DEAD; 2213 unp->unp_gcflag |= UNPGC_REF; 2214 unp_marked++; 2215 } 2216 } 2217 2218 static void 2219 unp_gc_process(struct unpcb *unp) 2220 { 2221 struct socket *soa; 2222 struct socket *so; 2223 struct file *fp; 2224 2225 /* Already processed. */ 2226 if (unp->unp_gcflag & UNPGC_SCANNED) 2227 return; 2228 fp = unp->unp_file; 2229 2230 /* 2231 * Check for a socket potentially in a cycle. It must be in a 2232 * queue as indicated by msgcount, and this must equal the file 2233 * reference count. Note that when msgcount is 0 the file is NULL. 2234 */ 2235 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp && 2236 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) { 2237 unp->unp_gcflag |= UNPGC_DEAD; 2238 unp_unreachable++; 2239 return; 2240 } 2241 2242 /* 2243 * Mark all sockets we reference with RIGHTS. 2244 */ 2245 so = unp->unp_socket; 2246 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) { 2247 SOCKBUF_LOCK(&so->so_rcv); 2248 unp_scan(so->so_rcv.sb_mb, unp_accessable); 2249 SOCKBUF_UNLOCK(&so->so_rcv); 2250 } 2251 2252 /* 2253 * Mark all sockets in our accept queue. 2254 */ 2255 ACCEPT_LOCK(); 2256 TAILQ_FOREACH(soa, &so->so_comp, so_list) { 2257 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0) 2258 continue; 2259 SOCKBUF_LOCK(&soa->so_rcv); 2260 unp_scan(soa->so_rcv.sb_mb, unp_accessable); 2261 SOCKBUF_UNLOCK(&soa->so_rcv); 2262 } 2263 ACCEPT_UNLOCK(); 2264 unp->unp_gcflag |= UNPGC_SCANNED; 2265 } 2266 2267 static int unp_recycled; 2268 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0, 2269 "Number of unreachable sockets claimed by the garbage collector."); 2270 2271 static int unp_taskcount; 2272 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0, 2273 "Number of times the garbage collector has run."); 2274 2275 static void 2276 unp_gc(__unused void *arg, int pending) 2277 { 2278 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead, 2279 NULL }; 2280 struct unp_head **head; 2281 struct file *f, **unref; 2282 struct unpcb *unp; 2283 int i, total; 2284 2285 unp_taskcount++; 2286 UNP_LIST_LOCK(); 2287 /* 2288 * First clear all gc flags from previous runs, apart from 2289 * UNPGC_IGNORE_RIGHTS. 2290 */ 2291 for (head = heads; *head != NULL; head++) 2292 LIST_FOREACH(unp, *head, unp_link) 2293 unp->unp_gcflag = 2294 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS); 2295 2296 /* 2297 * Scan marking all reachable sockets with UNPGC_REF. Once a socket 2298 * is reachable all of the sockets it references are reachable. 2299 * Stop the scan once we do a complete loop without discovering 2300 * a new reachable socket. 2301 */ 2302 do { 2303 unp_unreachable = 0; 2304 unp_marked = 0; 2305 for (head = heads; *head != NULL; head++) 2306 LIST_FOREACH(unp, *head, unp_link) 2307 unp_gc_process(unp); 2308 } while (unp_marked); 2309 UNP_LIST_UNLOCK(); 2310 if (unp_unreachable == 0) 2311 return; 2312 2313 /* 2314 * Allocate space for a local list of dead unpcbs. 2315 */ 2316 unref = malloc(unp_unreachable * sizeof(struct file *), 2317 M_TEMP, M_WAITOK); 2318 2319 /* 2320 * Iterate looking for sockets which have been specifically marked 2321 * as as unreachable and store them locally. 2322 */ 2323 UNP_LINK_RLOCK(); 2324 UNP_LIST_LOCK(); 2325 for (total = 0, head = heads; *head != NULL; head++) 2326 LIST_FOREACH(unp, *head, unp_link) 2327 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) { 2328 f = unp->unp_file; 2329 if (unp->unp_msgcount == 0 || f == NULL || 2330 f->f_count != unp->unp_msgcount) 2331 continue; 2332 unref[total++] = f; 2333 fhold(f); 2334 KASSERT(total <= unp_unreachable, 2335 ("unp_gc: incorrect unreachable count.")); 2336 } 2337 UNP_LIST_UNLOCK(); 2338 UNP_LINK_RUNLOCK(); 2339 2340 /* 2341 * Now flush all sockets, free'ing rights. This will free the 2342 * struct files associated with these sockets but leave each socket 2343 * with one remaining ref. 2344 */ 2345 for (i = 0; i < total; i++) { 2346 struct socket *so; 2347 2348 so = unref[i]->f_data; 2349 CURVNET_SET(so->so_vnet); 2350 sorflush(so); 2351 CURVNET_RESTORE(); 2352 } 2353 2354 /* 2355 * And finally release the sockets so they can be reclaimed. 2356 */ 2357 for (i = 0; i < total; i++) 2358 fdrop(unref[i], NULL); 2359 unp_recycled += total; 2360 free(unref, M_TEMP); 2361 } 2362 2363 static void 2364 unp_dispose(struct mbuf *m) 2365 { 2366 2367 if (m) 2368 unp_scan(m, unp_freerights); 2369 } 2370 2371 /* 2372 * Synchronize against unp_gc, which can trip over data as we are freeing it. 2373 */ 2374 static void 2375 unp_dispose_so(struct socket *so) 2376 { 2377 struct unpcb *unp; 2378 2379 unp = sotounpcb(so); 2380 UNP_LIST_LOCK(); 2381 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS; 2382 UNP_LIST_UNLOCK(); 2383 unp_dispose(so->so_rcv.sb_mb); 2384 } 2385 2386 static void 2387 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int)) 2388 { 2389 struct mbuf *m; 2390 struct cmsghdr *cm; 2391 void *data; 2392 socklen_t clen, datalen; 2393 2394 while (m0 != NULL) { 2395 for (m = m0; m; m = m->m_next) { 2396 if (m->m_type != MT_CONTROL) 2397 continue; 2398 2399 cm = mtod(m, struct cmsghdr *); 2400 clen = m->m_len; 2401 2402 while (cm != NULL) { 2403 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 2404 break; 2405 2406 data = CMSG_DATA(cm); 2407 datalen = (caddr_t)cm + cm->cmsg_len 2408 - (caddr_t)data; 2409 2410 if (cm->cmsg_level == SOL_SOCKET && 2411 cm->cmsg_type == SCM_RIGHTS) { 2412 (*op)(data, datalen / 2413 sizeof(struct filedescent *)); 2414 } 2415 2416 if (CMSG_SPACE(datalen) < clen) { 2417 clen -= CMSG_SPACE(datalen); 2418 cm = (struct cmsghdr *) 2419 ((caddr_t)cm + CMSG_SPACE(datalen)); 2420 } else { 2421 clen = 0; 2422 cm = NULL; 2423 } 2424 } 2425 } 2426 m0 = m0->m_nextpkt; 2427 } 2428 } 2429 2430 /* 2431 * A helper function called by VFS before socket-type vnode reclamation. 2432 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode 2433 * use count. 2434 */ 2435 void 2436 vfs_unp_reclaim(struct vnode *vp) 2437 { 2438 struct socket *so; 2439 struct unpcb *unp; 2440 int active; 2441 2442 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim"); 2443 KASSERT(vp->v_type == VSOCK, 2444 ("vfs_unp_reclaim: vp->v_type != VSOCK")); 2445 2446 active = 0; 2447 UNP_LINK_WLOCK(); 2448 VOP_UNP_CONNECT(vp, &so); 2449 if (so == NULL) 2450 goto done; 2451 unp = sotounpcb(so); 2452 if (unp == NULL) 2453 goto done; 2454 UNP_PCB_LOCK(unp); 2455 if (unp->unp_vnode == vp) { 2456 VOP_UNP_DETACH(vp); 2457 unp->unp_vnode = NULL; 2458 active = 1; 2459 } 2460 UNP_PCB_UNLOCK(unp); 2461 done: 2462 UNP_LINK_WUNLOCK(); 2463 if (active) 2464 vunref(vp); 2465 } 2466 2467 #ifdef DDB 2468 static void 2469 db_print_indent(int indent) 2470 { 2471 int i; 2472 2473 for (i = 0; i < indent; i++) 2474 db_printf(" "); 2475 } 2476 2477 static void 2478 db_print_unpflags(int unp_flags) 2479 { 2480 int comma; 2481 2482 comma = 0; 2483 if (unp_flags & UNP_HAVEPC) { 2484 db_printf("%sUNP_HAVEPC", comma ? ", " : ""); 2485 comma = 1; 2486 } 2487 if (unp_flags & UNP_HAVEPCCACHED) { 2488 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : ""); 2489 comma = 1; 2490 } 2491 if (unp_flags & UNP_WANTCRED) { 2492 db_printf("%sUNP_WANTCRED", comma ? ", " : ""); 2493 comma = 1; 2494 } 2495 if (unp_flags & UNP_CONNWAIT) { 2496 db_printf("%sUNP_CONNWAIT", comma ? ", " : ""); 2497 comma = 1; 2498 } 2499 if (unp_flags & UNP_CONNECTING) { 2500 db_printf("%sUNP_CONNECTING", comma ? ", " : ""); 2501 comma = 1; 2502 } 2503 if (unp_flags & UNP_BINDING) { 2504 db_printf("%sUNP_BINDING", comma ? ", " : ""); 2505 comma = 1; 2506 } 2507 } 2508 2509 static void 2510 db_print_xucred(int indent, struct xucred *xu) 2511 { 2512 int comma, i; 2513 2514 db_print_indent(indent); 2515 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n", 2516 xu->cr_version, xu->cr_uid, xu->cr_ngroups); 2517 db_print_indent(indent); 2518 db_printf("cr_groups: "); 2519 comma = 0; 2520 for (i = 0; i < xu->cr_ngroups; i++) { 2521 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]); 2522 comma = 1; 2523 } 2524 db_printf("\n"); 2525 } 2526 2527 static void 2528 db_print_unprefs(int indent, struct unp_head *uh) 2529 { 2530 struct unpcb *unp; 2531 int counter; 2532 2533 counter = 0; 2534 LIST_FOREACH(unp, uh, unp_reflink) { 2535 if (counter % 4 == 0) 2536 db_print_indent(indent); 2537 db_printf("%p ", unp); 2538 if (counter % 4 == 3) 2539 db_printf("\n"); 2540 counter++; 2541 } 2542 if (counter != 0 && counter % 4 != 0) 2543 db_printf("\n"); 2544 } 2545 2546 DB_SHOW_COMMAND(unpcb, db_show_unpcb) 2547 { 2548 struct unpcb *unp; 2549 2550 if (!have_addr) { 2551 db_printf("usage: show unpcb <addr>\n"); 2552 return; 2553 } 2554 unp = (struct unpcb *)addr; 2555 2556 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket, 2557 unp->unp_vnode); 2558 2559 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino, 2560 unp->unp_conn); 2561 2562 db_printf("unp_refs:\n"); 2563 db_print_unprefs(2, &unp->unp_refs); 2564 2565 /* XXXRW: Would be nice to print the full address, if any. */ 2566 db_printf("unp_addr: %p\n", unp->unp_addr); 2567 2568 db_printf("unp_gencnt: %llu\n", 2569 (unsigned long long)unp->unp_gencnt); 2570 2571 db_printf("unp_flags: %x (", unp->unp_flags); 2572 db_print_unpflags(unp->unp_flags); 2573 db_printf(")\n"); 2574 2575 db_printf("unp_peercred:\n"); 2576 db_print_xucred(2, &unp->unp_peercred); 2577 2578 db_printf("unp_refcount: %u\n", unp->unp_refcount); 2579 } 2580 #endif
Cache object: dde21ce61833b2a5c9cefcd540b26204
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