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/10.4/sys/kern/uipc_usrreq.c 305261 2016-09-02 00:14:28Z markj $"); 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_shutdown(struct unpcb *); 282 static void unp_drop(struct unpcb *, int); 283 static void unp_gc(__unused void *, int); 284 static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int)); 285 static void unp_discard(struct file *); 286 static void unp_freerights(struct filedescent **, int); 287 static void unp_init(void); 288 static int unp_internalize(struct mbuf **, struct thread *); 289 static void unp_internalize_fp(struct file *); 290 static int unp_externalize(struct mbuf *, struct mbuf **, int); 291 static int unp_externalize_fp(struct file *); 292 static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *); 293 static void unp_process_defers(void * __unused, int); 294 295 /* 296 * Definitions of protocols supported in the LOCAL domain. 297 */ 298 static struct domain localdomain; 299 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream; 300 static struct pr_usrreqs uipc_usrreqs_seqpacket; 301 static struct protosw localsw[] = { 302 { 303 .pr_type = SOCK_STREAM, 304 .pr_domain = &localdomain, 305 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS, 306 .pr_ctloutput = &uipc_ctloutput, 307 .pr_usrreqs = &uipc_usrreqs_stream 308 }, 309 { 310 .pr_type = SOCK_DGRAM, 311 .pr_domain = &localdomain, 312 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS, 313 .pr_ctloutput = &uipc_ctloutput, 314 .pr_usrreqs = &uipc_usrreqs_dgram 315 }, 316 { 317 .pr_type = SOCK_SEQPACKET, 318 .pr_domain = &localdomain, 319 320 /* 321 * XXXRW: For now, PR_ADDR because soreceive will bump into them 322 * due to our use of sbappendaddr. A new sbappend variants is needed 323 * that supports both atomic record writes and control data. 324 */ 325 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD| 326 PR_RIGHTS, 327 .pr_ctloutput = &uipc_ctloutput, 328 .pr_usrreqs = &uipc_usrreqs_seqpacket, 329 }, 330 }; 331 332 static struct domain localdomain = { 333 .dom_family = AF_LOCAL, 334 .dom_name = "local", 335 .dom_init = unp_init, 336 .dom_externalize = unp_externalize, 337 .dom_dispose = unp_dispose, 338 .dom_protosw = localsw, 339 .dom_protoswNPROTOSW = &localsw[sizeof(localsw)/sizeof(localsw[0])] 340 }; 341 DOMAIN_SET(local); 342 343 static void 344 uipc_abort(struct socket *so) 345 { 346 struct unpcb *unp, *unp2; 347 348 unp = sotounpcb(so); 349 KASSERT(unp != NULL, ("uipc_abort: unp == NULL")); 350 351 UNP_LINK_WLOCK(); 352 UNP_PCB_LOCK(unp); 353 unp2 = unp->unp_conn; 354 if (unp2 != NULL) { 355 UNP_PCB_LOCK(unp2); 356 unp_drop(unp2, ECONNABORTED); 357 UNP_PCB_UNLOCK(unp2); 358 } 359 UNP_PCB_UNLOCK(unp); 360 UNP_LINK_WUNLOCK(); 361 } 362 363 static int 364 uipc_accept(struct socket *so, struct sockaddr **nam) 365 { 366 struct unpcb *unp, *unp2; 367 const struct sockaddr *sa; 368 369 /* 370 * Pass back name of connected socket, if it was bound and we are 371 * still connected (our peer may have closed already!). 372 */ 373 unp = sotounpcb(so); 374 KASSERT(unp != NULL, ("uipc_accept: unp == NULL")); 375 376 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 377 UNP_LINK_RLOCK(); 378 unp2 = unp->unp_conn; 379 if (unp2 != NULL && unp2->unp_addr != NULL) { 380 UNP_PCB_LOCK(unp2); 381 sa = (struct sockaddr *) unp2->unp_addr; 382 bcopy(sa, *nam, sa->sa_len); 383 UNP_PCB_UNLOCK(unp2); 384 } else { 385 sa = &sun_noname; 386 bcopy(sa, *nam, sa->sa_len); 387 } 388 UNP_LINK_RUNLOCK(); 389 return (0); 390 } 391 392 static int 393 uipc_attach(struct socket *so, int proto, struct thread *td) 394 { 395 u_long sendspace, recvspace; 396 struct unpcb *unp; 397 int error; 398 399 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL")); 400 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 401 switch (so->so_type) { 402 case SOCK_STREAM: 403 sendspace = unpst_sendspace; 404 recvspace = unpst_recvspace; 405 break; 406 407 case SOCK_DGRAM: 408 sendspace = unpdg_sendspace; 409 recvspace = unpdg_recvspace; 410 break; 411 412 case SOCK_SEQPACKET: 413 sendspace = unpsp_sendspace; 414 recvspace = unpsp_recvspace; 415 break; 416 417 default: 418 panic("uipc_attach"); 419 } 420 error = soreserve(so, sendspace, recvspace); 421 if (error) 422 return (error); 423 } 424 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO); 425 if (unp == NULL) 426 return (ENOBUFS); 427 LIST_INIT(&unp->unp_refs); 428 UNP_PCB_LOCK_INIT(unp); 429 unp->unp_socket = so; 430 so->so_pcb = unp; 431 unp->unp_refcount = 1; 432 if (so->so_head != NULL) 433 unp->unp_flags |= UNP_NASCENT; 434 435 UNP_LIST_LOCK(); 436 unp->unp_gencnt = ++unp_gencnt; 437 unp_count++; 438 switch (so->so_type) { 439 case SOCK_STREAM: 440 LIST_INSERT_HEAD(&unp_shead, unp, unp_link); 441 break; 442 443 case SOCK_DGRAM: 444 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link); 445 break; 446 447 case SOCK_SEQPACKET: 448 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link); 449 break; 450 451 default: 452 panic("uipc_attach"); 453 } 454 UNP_LIST_UNLOCK(); 455 456 return (0); 457 } 458 459 static int 460 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td) 461 { 462 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 463 struct vattr vattr; 464 int error, namelen; 465 struct nameidata nd; 466 struct unpcb *unp; 467 struct vnode *vp; 468 struct mount *mp; 469 cap_rights_t rights; 470 char *buf; 471 472 if (nam->sa_family != AF_UNIX) 473 return (EAFNOSUPPORT); 474 475 unp = sotounpcb(so); 476 KASSERT(unp != NULL, ("uipc_bind: unp == NULL")); 477 478 if (soun->sun_len > sizeof(struct sockaddr_un)) 479 return (EINVAL); 480 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); 481 if (namelen <= 0) 482 return (EINVAL); 483 484 /* 485 * We don't allow simultaneous bind() calls on a single UNIX domain 486 * socket, so flag in-progress operations, and return an error if an 487 * operation is already in progress. 488 * 489 * Historically, we have not allowed a socket to be rebound, so this 490 * also returns an error. Not allowing re-binding simplifies the 491 * implementation and avoids a great many possible failure modes. 492 */ 493 UNP_PCB_LOCK(unp); 494 if (unp->unp_vnode != NULL) { 495 UNP_PCB_UNLOCK(unp); 496 return (EINVAL); 497 } 498 if (unp->unp_flags & UNP_BINDING) { 499 UNP_PCB_UNLOCK(unp); 500 return (EALREADY); 501 } 502 unp->unp_flags |= UNP_BINDING; 503 UNP_PCB_UNLOCK(unp); 504 505 buf = malloc(namelen + 1, M_TEMP, M_WAITOK); 506 bcopy(soun->sun_path, buf, namelen); 507 buf[namelen] = 0; 508 509 restart: 510 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE, 511 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td); 512 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 513 error = namei(&nd); 514 if (error) 515 goto error; 516 vp = nd.ni_vp; 517 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 518 NDFREE(&nd, NDF_ONLY_PNBUF); 519 if (nd.ni_dvp == vp) 520 vrele(nd.ni_dvp); 521 else 522 vput(nd.ni_dvp); 523 if (vp != NULL) { 524 vrele(vp); 525 error = EADDRINUSE; 526 goto error; 527 } 528 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 529 if (error) 530 goto error; 531 goto restart; 532 } 533 VATTR_NULL(&vattr); 534 vattr.va_type = VSOCK; 535 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask); 536 #ifdef MAC 537 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 538 &vattr); 539 #endif 540 if (error == 0) 541 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 542 NDFREE(&nd, NDF_ONLY_PNBUF); 543 vput(nd.ni_dvp); 544 if (error) { 545 vn_finished_write(mp); 546 goto error; 547 } 548 vp = nd.ni_vp; 549 ASSERT_VOP_ELOCKED(vp, "uipc_bind"); 550 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK); 551 552 UNP_LINK_WLOCK(); 553 UNP_PCB_LOCK(unp); 554 VOP_UNP_BIND(vp, unp->unp_socket); 555 unp->unp_vnode = vp; 556 unp->unp_addr = soun; 557 unp->unp_flags &= ~UNP_BINDING; 558 UNP_PCB_UNLOCK(unp); 559 UNP_LINK_WUNLOCK(); 560 VOP_UNLOCK(vp, 0); 561 vn_finished_write(mp); 562 free(buf, M_TEMP); 563 return (0); 564 565 error: 566 UNP_PCB_LOCK(unp); 567 unp->unp_flags &= ~UNP_BINDING; 568 UNP_PCB_UNLOCK(unp); 569 free(buf, M_TEMP); 570 return (error); 571 } 572 573 static int 574 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 575 { 576 577 return (uipc_bindat(AT_FDCWD, so, nam, td)); 578 } 579 580 static int 581 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 582 { 583 int error; 584 585 KASSERT(td == curthread, ("uipc_connect: td != curthread")); 586 UNP_LINK_WLOCK(); 587 error = unp_connect(so, nam, td); 588 UNP_LINK_WUNLOCK(); 589 return (error); 590 } 591 592 static int 593 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam, 594 struct thread *td) 595 { 596 int error; 597 598 KASSERT(td == curthread, ("uipc_connectat: td != curthread")); 599 UNP_LINK_WLOCK(); 600 error = unp_connectat(fd, so, nam, td); 601 UNP_LINK_WUNLOCK(); 602 return (error); 603 } 604 605 static void 606 uipc_close(struct socket *so) 607 { 608 struct unpcb *unp, *unp2; 609 610 unp = sotounpcb(so); 611 KASSERT(unp != NULL, ("uipc_close: unp == NULL")); 612 613 UNP_LINK_WLOCK(); 614 UNP_PCB_LOCK(unp); 615 unp2 = unp->unp_conn; 616 if (unp2 != NULL) { 617 UNP_PCB_LOCK(unp2); 618 unp_disconnect(unp, unp2); 619 UNP_PCB_UNLOCK(unp2); 620 } 621 UNP_PCB_UNLOCK(unp); 622 UNP_LINK_WUNLOCK(); 623 } 624 625 static int 626 uipc_connect2(struct socket *so1, struct socket *so2) 627 { 628 struct unpcb *unp, *unp2; 629 int error; 630 631 UNP_LINK_WLOCK(); 632 unp = so1->so_pcb; 633 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL")); 634 UNP_PCB_LOCK(unp); 635 unp2 = so2->so_pcb; 636 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL")); 637 UNP_PCB_LOCK(unp2); 638 error = unp_connect2(so1, so2, PRU_CONNECT2); 639 UNP_PCB_UNLOCK(unp2); 640 UNP_PCB_UNLOCK(unp); 641 UNP_LINK_WUNLOCK(); 642 return (error); 643 } 644 645 static void 646 uipc_detach(struct socket *so) 647 { 648 struct unpcb *unp, *unp2; 649 struct sockaddr_un *saved_unp_addr; 650 struct vnode *vp; 651 int freeunp, local_unp_rights; 652 653 unp = sotounpcb(so); 654 KASSERT(unp != NULL, ("uipc_detach: unp == NULL")); 655 656 vp = NULL; 657 local_unp_rights = 0; 658 659 UNP_LIST_LOCK(); 660 LIST_REMOVE(unp, unp_link); 661 unp->unp_gencnt = ++unp_gencnt; 662 --unp_count; 663 UNP_LIST_UNLOCK(); 664 665 if ((unp->unp_flags & UNP_NASCENT) != 0) { 666 UNP_PCB_LOCK(unp); 667 goto teardown; 668 } 669 UNP_LINK_WLOCK(); 670 UNP_PCB_LOCK(unp); 671 672 /* 673 * XXXRW: Should assert vp->v_socket == so. 674 */ 675 if ((vp = unp->unp_vnode) != NULL) { 676 VOP_UNP_DETACH(vp); 677 unp->unp_vnode = NULL; 678 } 679 unp2 = unp->unp_conn; 680 if (unp2 != NULL) { 681 UNP_PCB_LOCK(unp2); 682 unp_disconnect(unp, unp2); 683 UNP_PCB_UNLOCK(unp2); 684 } 685 686 /* 687 * We hold the linkage lock exclusively, so it's OK to acquire 688 * multiple pcb locks at a time. 689 */ 690 while (!LIST_EMPTY(&unp->unp_refs)) { 691 struct unpcb *ref = LIST_FIRST(&unp->unp_refs); 692 693 UNP_PCB_LOCK(ref); 694 unp_drop(ref, ECONNRESET); 695 UNP_PCB_UNLOCK(ref); 696 } 697 local_unp_rights = unp_rights; 698 UNP_LINK_WUNLOCK(); 699 teardown: 700 unp->unp_socket->so_pcb = NULL; 701 saved_unp_addr = unp->unp_addr; 702 unp->unp_addr = NULL; 703 unp->unp_refcount--; 704 freeunp = (unp->unp_refcount == 0); 705 if (saved_unp_addr != NULL) 706 free(saved_unp_addr, M_SONAME); 707 if (freeunp) { 708 UNP_PCB_LOCK_DESTROY(unp); 709 uma_zfree(unp_zone, unp); 710 } else 711 UNP_PCB_UNLOCK(unp); 712 if (vp) 713 vrele(vp); 714 if (local_unp_rights) 715 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1); 716 } 717 718 static int 719 uipc_disconnect(struct socket *so) 720 { 721 struct unpcb *unp, *unp2; 722 723 unp = sotounpcb(so); 724 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL")); 725 726 UNP_LINK_WLOCK(); 727 UNP_PCB_LOCK(unp); 728 unp2 = unp->unp_conn; 729 if (unp2 != NULL) { 730 UNP_PCB_LOCK(unp2); 731 unp_disconnect(unp, unp2); 732 UNP_PCB_UNLOCK(unp2); 733 } 734 UNP_PCB_UNLOCK(unp); 735 UNP_LINK_WUNLOCK(); 736 return (0); 737 } 738 739 static int 740 uipc_listen(struct socket *so, int backlog, struct thread *td) 741 { 742 struct unpcb *unp; 743 int error; 744 745 unp = sotounpcb(so); 746 KASSERT(unp != NULL, ("uipc_listen: unp == NULL")); 747 748 UNP_PCB_LOCK(unp); 749 if (unp->unp_vnode == NULL) { 750 UNP_PCB_UNLOCK(unp); 751 return (EINVAL); 752 } 753 754 SOCK_LOCK(so); 755 error = solisten_proto_check(so); 756 if (error == 0) { 757 cru2x(td->td_ucred, &unp->unp_peercred); 758 unp->unp_flags |= UNP_HAVEPCCACHED; 759 solisten_proto(so, backlog); 760 } 761 SOCK_UNLOCK(so); 762 UNP_PCB_UNLOCK(unp); 763 return (error); 764 } 765 766 static int 767 uipc_peeraddr(struct socket *so, struct sockaddr **nam) 768 { 769 struct unpcb *unp, *unp2; 770 const struct sockaddr *sa; 771 772 unp = sotounpcb(so); 773 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL")); 774 775 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 776 UNP_LINK_RLOCK(); 777 /* 778 * XXX: It seems that this test always fails even when connection is 779 * established. So, this else clause is added as workaround to 780 * return PF_LOCAL sockaddr. 781 */ 782 unp2 = unp->unp_conn; 783 if (unp2 != NULL) { 784 UNP_PCB_LOCK(unp2); 785 if (unp2->unp_addr != NULL) 786 sa = (struct sockaddr *) unp2->unp_addr; 787 else 788 sa = &sun_noname; 789 bcopy(sa, *nam, sa->sa_len); 790 UNP_PCB_UNLOCK(unp2); 791 } else { 792 sa = &sun_noname; 793 bcopy(sa, *nam, sa->sa_len); 794 } 795 UNP_LINK_RUNLOCK(); 796 return (0); 797 } 798 799 static int 800 uipc_rcvd(struct socket *so, int flags) 801 { 802 struct unpcb *unp, *unp2; 803 struct socket *so2; 804 u_int mbcnt, sbcc; 805 806 unp = sotounpcb(so); 807 KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL")); 808 809 if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET) 810 panic("uipc_rcvd socktype %d", so->so_type); 811 812 /* 813 * Adjust backpressure on sender and wakeup any waiting to write. 814 * 815 * The unp lock is acquired to maintain the validity of the unp_conn 816 * pointer; no lock on unp2 is required as unp2->unp_socket will be 817 * static as long as we don't permit unp2 to disconnect from unp, 818 * which is prevented by the lock on unp. We cache values from 819 * so_rcv to avoid holding the so_rcv lock over the entire 820 * transaction on the remote so_snd. 821 */ 822 SOCKBUF_LOCK(&so->so_rcv); 823 mbcnt = so->so_rcv.sb_mbcnt; 824 sbcc = so->so_rcv.sb_cc; 825 SOCKBUF_UNLOCK(&so->so_rcv); 826 /* 827 * There is a benign race condition at this point. If we're planning to 828 * clear SB_STOP, but uipc_send is called on the connected socket at 829 * this instant, it might add data to the sockbuf and set SB_STOP. Then 830 * we would erroneously clear SB_STOP below, even though the sockbuf is 831 * full. The race is benign because the only ill effect is to allow the 832 * sockbuf to exceed its size limit, and the size limits are not 833 * strictly guaranteed anyway. 834 */ 835 UNP_PCB_LOCK(unp); 836 unp2 = unp->unp_conn; 837 if (unp2 == NULL) { 838 UNP_PCB_UNLOCK(unp); 839 return (0); 840 } 841 so2 = unp2->unp_socket; 842 SOCKBUF_LOCK(&so2->so_snd); 843 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax) 844 so2->so_snd.sb_flags &= ~SB_STOP; 845 sowwakeup_locked(so2); 846 UNP_PCB_UNLOCK(unp); 847 return (0); 848 } 849 850 static int 851 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 852 struct mbuf *control, struct thread *td) 853 { 854 struct unpcb *unp, *unp2; 855 struct socket *so2; 856 u_int mbcnt, sbcc; 857 int error = 0; 858 859 unp = sotounpcb(so); 860 KASSERT(unp != NULL, ("uipc_send: unp == NULL")); 861 862 if (flags & PRUS_OOB) { 863 error = EOPNOTSUPP; 864 goto release; 865 } 866 if (control != NULL && (error = unp_internalize(&control, td))) 867 goto release; 868 if ((nam != NULL) || (flags & PRUS_EOF)) 869 UNP_LINK_WLOCK(); 870 else 871 UNP_LINK_RLOCK(); 872 switch (so->so_type) { 873 case SOCK_DGRAM: 874 { 875 const struct sockaddr *from; 876 877 unp2 = unp->unp_conn; 878 if (nam != NULL) { 879 UNP_LINK_WLOCK_ASSERT(); 880 if (unp2 != NULL) { 881 error = EISCONN; 882 break; 883 } 884 error = unp_connect(so, nam, td); 885 if (error) 886 break; 887 unp2 = unp->unp_conn; 888 } 889 890 /* 891 * Because connect() and send() are non-atomic in a sendto() 892 * with a target address, it's possible that the socket will 893 * have disconnected before the send() can run. In that case 894 * return the slightly counter-intuitive but otherwise 895 * correct error that the socket is not connected. 896 */ 897 if (unp2 == NULL) { 898 error = ENOTCONN; 899 break; 900 } 901 /* Lockless read. */ 902 if (unp2->unp_flags & UNP_WANTCRED) 903 control = unp_addsockcred(td, control); 904 UNP_PCB_LOCK(unp); 905 if (unp->unp_addr != NULL) 906 from = (struct sockaddr *)unp->unp_addr; 907 else 908 from = &sun_noname; 909 so2 = unp2->unp_socket; 910 SOCKBUF_LOCK(&so2->so_rcv); 911 if (sbappendaddr_locked(&so2->so_rcv, from, m, 912 control)) { 913 sorwakeup_locked(so2); 914 m = NULL; 915 control = NULL; 916 } else { 917 SOCKBUF_UNLOCK(&so2->so_rcv); 918 error = ENOBUFS; 919 } 920 if (nam != NULL) { 921 UNP_LINK_WLOCK_ASSERT(); 922 UNP_PCB_LOCK(unp2); 923 unp_disconnect(unp, unp2); 924 UNP_PCB_UNLOCK(unp2); 925 } 926 UNP_PCB_UNLOCK(unp); 927 break; 928 } 929 930 case SOCK_SEQPACKET: 931 case SOCK_STREAM: 932 if ((so->so_state & SS_ISCONNECTED) == 0) { 933 if (nam != NULL) { 934 UNP_LINK_WLOCK_ASSERT(); 935 error = unp_connect(so, nam, td); 936 if (error) 937 break; /* XXX */ 938 } else { 939 error = ENOTCONN; 940 break; 941 } 942 } 943 944 /* Lockless read. */ 945 if (so->so_snd.sb_state & SBS_CANTSENDMORE) { 946 error = EPIPE; 947 break; 948 } 949 950 /* 951 * Because connect() and send() are non-atomic in a sendto() 952 * with a target address, it's possible that the socket will 953 * have disconnected before the send() can run. In that case 954 * return the slightly counter-intuitive but otherwise 955 * correct error that the socket is not connected. 956 * 957 * Locking here must be done carefully: the linkage lock 958 * prevents interconnections between unpcbs from changing, so 959 * we can traverse from unp to unp2 without acquiring unp's 960 * lock. Socket buffer locks follow unpcb locks, so we can 961 * acquire both remote and lock socket buffer locks. 962 */ 963 unp2 = unp->unp_conn; 964 if (unp2 == NULL) { 965 error = ENOTCONN; 966 break; 967 } 968 so2 = unp2->unp_socket; 969 UNP_PCB_LOCK(unp2); 970 SOCKBUF_LOCK(&so2->so_rcv); 971 if (unp2->unp_flags & UNP_WANTCRED) { 972 /* 973 * Credentials are passed only once on SOCK_STREAM 974 * and SOCK_SEQPACKET. 975 */ 976 unp2->unp_flags &= ~UNP_WANTCRED; 977 control = unp_addsockcred(td, control); 978 } 979 /* 980 * Send to paired receive port, and then reduce send buffer 981 * hiwater marks to maintain backpressure. Wake up readers. 982 */ 983 switch (so->so_type) { 984 case SOCK_STREAM: 985 if (control != NULL) { 986 if (sbappendcontrol_locked(&so2->so_rcv, m, 987 control)) 988 control = NULL; 989 } else 990 sbappend_locked(&so2->so_rcv, m); 991 break; 992 993 case SOCK_SEQPACKET: { 994 const struct sockaddr *from; 995 996 from = &sun_noname; 997 /* 998 * Don't check for space available in so2->so_rcv. 999 * Unix domain sockets only check for space in the 1000 * sending sockbuf, and that check is performed one 1001 * level up the stack. 1002 */ 1003 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv, 1004 from, m, control)) 1005 control = NULL; 1006 break; 1007 } 1008 } 1009 1010 mbcnt = so2->so_rcv.sb_mbcnt; 1011 sbcc = so2->so_rcv.sb_cc; 1012 sorwakeup_locked(so2); 1013 1014 /* 1015 * The PCB lock on unp2 protects the SB_STOP flag. Without it, 1016 * it would be possible for uipc_rcvd to be called at this 1017 * point, drain the receiving sockbuf, clear SB_STOP, and then 1018 * we would set SB_STOP below. That could lead to an empty 1019 * sockbuf having SB_STOP set 1020 */ 1021 SOCKBUF_LOCK(&so->so_snd); 1022 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax) 1023 so->so_snd.sb_flags |= SB_STOP; 1024 SOCKBUF_UNLOCK(&so->so_snd); 1025 UNP_PCB_UNLOCK(unp2); 1026 m = NULL; 1027 break; 1028 1029 default: 1030 panic("uipc_send unknown socktype"); 1031 } 1032 1033 /* 1034 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown. 1035 */ 1036 if (flags & PRUS_EOF) { 1037 UNP_PCB_LOCK(unp); 1038 socantsendmore(so); 1039 unp_shutdown(unp); 1040 UNP_PCB_UNLOCK(unp); 1041 } 1042 1043 if ((nam != NULL) || (flags & PRUS_EOF)) 1044 UNP_LINK_WUNLOCK(); 1045 else 1046 UNP_LINK_RUNLOCK(); 1047 1048 if (control != NULL && error != 0) 1049 unp_dispose(control); 1050 1051 release: 1052 if (control != NULL) 1053 m_freem(control); 1054 if (m != NULL) 1055 m_freem(m); 1056 return (error); 1057 } 1058 1059 static int 1060 uipc_sense(struct socket *so, struct stat *sb) 1061 { 1062 struct unpcb *unp; 1063 1064 unp = sotounpcb(so); 1065 KASSERT(unp != NULL, ("uipc_sense: unp == NULL")); 1066 1067 sb->st_blksize = so->so_snd.sb_hiwat; 1068 UNP_PCB_LOCK(unp); 1069 sb->st_dev = NODEV; 1070 if (unp->unp_ino == 0) 1071 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino; 1072 sb->st_ino = unp->unp_ino; 1073 UNP_PCB_UNLOCK(unp); 1074 return (0); 1075 } 1076 1077 static int 1078 uipc_shutdown(struct socket *so) 1079 { 1080 struct unpcb *unp; 1081 1082 unp = sotounpcb(so); 1083 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL")); 1084 1085 UNP_LINK_WLOCK(); 1086 UNP_PCB_LOCK(unp); 1087 socantsendmore(so); 1088 unp_shutdown(unp); 1089 UNP_PCB_UNLOCK(unp); 1090 UNP_LINK_WUNLOCK(); 1091 return (0); 1092 } 1093 1094 static int 1095 uipc_sockaddr(struct socket *so, struct sockaddr **nam) 1096 { 1097 struct unpcb *unp; 1098 const struct sockaddr *sa; 1099 1100 unp = sotounpcb(so); 1101 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL")); 1102 1103 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 1104 UNP_PCB_LOCK(unp); 1105 if (unp->unp_addr != NULL) 1106 sa = (struct sockaddr *) unp->unp_addr; 1107 else 1108 sa = &sun_noname; 1109 bcopy(sa, *nam, sa->sa_len); 1110 UNP_PCB_UNLOCK(unp); 1111 return (0); 1112 } 1113 1114 static struct pr_usrreqs uipc_usrreqs_dgram = { 1115 .pru_abort = uipc_abort, 1116 .pru_accept = uipc_accept, 1117 .pru_attach = uipc_attach, 1118 .pru_bind = uipc_bind, 1119 .pru_bindat = uipc_bindat, 1120 .pru_connect = uipc_connect, 1121 .pru_connectat = uipc_connectat, 1122 .pru_connect2 = uipc_connect2, 1123 .pru_detach = uipc_detach, 1124 .pru_disconnect = uipc_disconnect, 1125 .pru_listen = uipc_listen, 1126 .pru_peeraddr = uipc_peeraddr, 1127 .pru_rcvd = uipc_rcvd, 1128 .pru_send = uipc_send, 1129 .pru_sense = uipc_sense, 1130 .pru_shutdown = uipc_shutdown, 1131 .pru_sockaddr = uipc_sockaddr, 1132 .pru_soreceive = soreceive_dgram, 1133 .pru_close = uipc_close, 1134 }; 1135 1136 static struct pr_usrreqs uipc_usrreqs_seqpacket = { 1137 .pru_abort = uipc_abort, 1138 .pru_accept = uipc_accept, 1139 .pru_attach = uipc_attach, 1140 .pru_bind = uipc_bind, 1141 .pru_bindat = uipc_bindat, 1142 .pru_connect = uipc_connect, 1143 .pru_connectat = uipc_connectat, 1144 .pru_connect2 = uipc_connect2, 1145 .pru_detach = uipc_detach, 1146 .pru_disconnect = uipc_disconnect, 1147 .pru_listen = uipc_listen, 1148 .pru_peeraddr = uipc_peeraddr, 1149 .pru_rcvd = uipc_rcvd, 1150 .pru_send = uipc_send, 1151 .pru_sense = uipc_sense, 1152 .pru_shutdown = uipc_shutdown, 1153 .pru_sockaddr = uipc_sockaddr, 1154 .pru_soreceive = soreceive_generic, /* XXX: or...? */ 1155 .pru_close = uipc_close, 1156 }; 1157 1158 static struct pr_usrreqs uipc_usrreqs_stream = { 1159 .pru_abort = uipc_abort, 1160 .pru_accept = uipc_accept, 1161 .pru_attach = uipc_attach, 1162 .pru_bind = uipc_bind, 1163 .pru_bindat = uipc_bindat, 1164 .pru_connect = uipc_connect, 1165 .pru_connectat = uipc_connectat, 1166 .pru_connect2 = uipc_connect2, 1167 .pru_detach = uipc_detach, 1168 .pru_disconnect = uipc_disconnect, 1169 .pru_listen = uipc_listen, 1170 .pru_peeraddr = uipc_peeraddr, 1171 .pru_rcvd = uipc_rcvd, 1172 .pru_send = uipc_send, 1173 .pru_sense = uipc_sense, 1174 .pru_shutdown = uipc_shutdown, 1175 .pru_sockaddr = uipc_sockaddr, 1176 .pru_soreceive = soreceive_generic, 1177 .pru_close = uipc_close, 1178 }; 1179 1180 static int 1181 uipc_ctloutput(struct socket *so, struct sockopt *sopt) 1182 { 1183 struct unpcb *unp; 1184 struct xucred xu; 1185 int error, optval; 1186 1187 if (sopt->sopt_level != 0) 1188 return (EINVAL); 1189 1190 unp = sotounpcb(so); 1191 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL")); 1192 error = 0; 1193 switch (sopt->sopt_dir) { 1194 case SOPT_GET: 1195 switch (sopt->sopt_name) { 1196 case LOCAL_PEERCRED: 1197 UNP_PCB_LOCK(unp); 1198 if (unp->unp_flags & UNP_HAVEPC) 1199 xu = unp->unp_peercred; 1200 else { 1201 if (so->so_type == SOCK_STREAM) 1202 error = ENOTCONN; 1203 else 1204 error = EINVAL; 1205 } 1206 UNP_PCB_UNLOCK(unp); 1207 if (error == 0) 1208 error = sooptcopyout(sopt, &xu, sizeof(xu)); 1209 break; 1210 1211 case LOCAL_CREDS: 1212 /* Unlocked read. */ 1213 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0; 1214 error = sooptcopyout(sopt, &optval, sizeof(optval)); 1215 break; 1216 1217 case LOCAL_CONNWAIT: 1218 /* Unlocked read. */ 1219 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0; 1220 error = sooptcopyout(sopt, &optval, sizeof(optval)); 1221 break; 1222 1223 default: 1224 error = EOPNOTSUPP; 1225 break; 1226 } 1227 break; 1228 1229 case SOPT_SET: 1230 switch (sopt->sopt_name) { 1231 case LOCAL_CREDS: 1232 case LOCAL_CONNWAIT: 1233 error = sooptcopyin(sopt, &optval, sizeof(optval), 1234 sizeof(optval)); 1235 if (error) 1236 break; 1237 1238 #define OPTSET(bit) do { \ 1239 UNP_PCB_LOCK(unp); \ 1240 if (optval) \ 1241 unp->unp_flags |= bit; \ 1242 else \ 1243 unp->unp_flags &= ~bit; \ 1244 UNP_PCB_UNLOCK(unp); \ 1245 } while (0) 1246 1247 switch (sopt->sopt_name) { 1248 case LOCAL_CREDS: 1249 OPTSET(UNP_WANTCRED); 1250 break; 1251 1252 case LOCAL_CONNWAIT: 1253 OPTSET(UNP_CONNWAIT); 1254 break; 1255 1256 default: 1257 break; 1258 } 1259 break; 1260 #undef OPTSET 1261 default: 1262 error = ENOPROTOOPT; 1263 break; 1264 } 1265 break; 1266 1267 default: 1268 error = EOPNOTSUPP; 1269 break; 1270 } 1271 return (error); 1272 } 1273 1274 static int 1275 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1276 { 1277 1278 return (unp_connectat(AT_FDCWD, so, nam, td)); 1279 } 1280 1281 static int 1282 unp_connectat(int fd, struct socket *so, struct sockaddr *nam, 1283 struct thread *td) 1284 { 1285 struct sockaddr_un *soun = (struct sockaddr_un *)nam; 1286 struct vnode *vp; 1287 struct socket *so2, *so3; 1288 struct unpcb *unp, *unp2, *unp3; 1289 struct nameidata nd; 1290 char buf[SOCK_MAXADDRLEN]; 1291 struct sockaddr *sa; 1292 cap_rights_t rights; 1293 int error, len; 1294 1295 if (nam->sa_family != AF_UNIX) 1296 return (EAFNOSUPPORT); 1297 1298 UNP_LINK_WLOCK_ASSERT(); 1299 1300 unp = sotounpcb(so); 1301 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1302 1303 if (nam->sa_len > sizeof(struct sockaddr_un)) 1304 return (EINVAL); 1305 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); 1306 if (len <= 0) 1307 return (EINVAL); 1308 bcopy(soun->sun_path, buf, len); 1309 buf[len] = 0; 1310 1311 UNP_PCB_LOCK(unp); 1312 if (unp->unp_flags & UNP_CONNECTING) { 1313 UNP_PCB_UNLOCK(unp); 1314 return (EALREADY); 1315 } 1316 UNP_LINK_WUNLOCK(); 1317 unp->unp_flags |= UNP_CONNECTING; 1318 UNP_PCB_UNLOCK(unp); 1319 1320 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK); 1321 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, 1322 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td); 1323 error = namei(&nd); 1324 if (error) 1325 vp = NULL; 1326 else 1327 vp = nd.ni_vp; 1328 ASSERT_VOP_LOCKED(vp, "unp_connect"); 1329 NDFREE(&nd, NDF_ONLY_PNBUF); 1330 if (error) 1331 goto bad; 1332 1333 if (vp->v_type != VSOCK) { 1334 error = ENOTSOCK; 1335 goto bad; 1336 } 1337 #ifdef MAC 1338 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD); 1339 if (error) 1340 goto bad; 1341 #endif 1342 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td); 1343 if (error) 1344 goto bad; 1345 1346 unp = sotounpcb(so); 1347 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1348 1349 /* 1350 * Lock linkage lock for two reasons: make sure v_socket is stable, 1351 * and to protect simultaneous locking of multiple pcbs. 1352 */ 1353 UNP_LINK_WLOCK(); 1354 VOP_UNP_CONNECT(vp, &so2); 1355 if (so2 == NULL) { 1356 error = ECONNREFUSED; 1357 goto bad2; 1358 } 1359 if (so->so_type != so2->so_type) { 1360 error = EPROTOTYPE; 1361 goto bad2; 1362 } 1363 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 1364 if (so2->so_options & SO_ACCEPTCONN) { 1365 CURVNET_SET(so2->so_vnet); 1366 so3 = sonewconn(so2, 0); 1367 CURVNET_RESTORE(); 1368 } else 1369 so3 = NULL; 1370 if (so3 == NULL) { 1371 error = ECONNREFUSED; 1372 goto bad2; 1373 } 1374 unp = sotounpcb(so); 1375 unp2 = sotounpcb(so2); 1376 unp3 = sotounpcb(so3); 1377 UNP_PCB_LOCK(unp); 1378 UNP_PCB_LOCK(unp2); 1379 UNP_PCB_LOCK(unp3); 1380 if (unp2->unp_addr != NULL) { 1381 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len); 1382 unp3->unp_addr = (struct sockaddr_un *) sa; 1383 sa = NULL; 1384 } 1385 1386 /* 1387 * The connector's (client's) credentials are copied from its 1388 * process structure at the time of connect() (which is now). 1389 */ 1390 cru2x(td->td_ucred, &unp3->unp_peercred); 1391 unp3->unp_flags |= UNP_HAVEPC; 1392 1393 /* 1394 * The receiver's (server's) credentials are copied from the 1395 * unp_peercred member of socket on which the former called 1396 * listen(); uipc_listen() cached that process's credentials 1397 * at that time so we can use them now. 1398 */ 1399 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, 1400 ("unp_connect: listener without cached peercred")); 1401 memcpy(&unp->unp_peercred, &unp2->unp_peercred, 1402 sizeof(unp->unp_peercred)); 1403 unp->unp_flags |= UNP_HAVEPC; 1404 if (unp2->unp_flags & UNP_WANTCRED) 1405 unp3->unp_flags |= UNP_WANTCRED; 1406 UNP_PCB_UNLOCK(unp3); 1407 UNP_PCB_UNLOCK(unp2); 1408 UNP_PCB_UNLOCK(unp); 1409 #ifdef MAC 1410 mac_socketpeer_set_from_socket(so, so3); 1411 mac_socketpeer_set_from_socket(so3, so); 1412 #endif 1413 1414 so2 = so3; 1415 } 1416 unp = sotounpcb(so); 1417 KASSERT(unp != NULL, ("unp_connect: unp == NULL")); 1418 unp2 = sotounpcb(so2); 1419 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL")); 1420 UNP_PCB_LOCK(unp); 1421 UNP_PCB_LOCK(unp2); 1422 error = unp_connect2(so, so2, PRU_CONNECT); 1423 UNP_PCB_UNLOCK(unp2); 1424 UNP_PCB_UNLOCK(unp); 1425 bad2: 1426 UNP_LINK_WUNLOCK(); 1427 bad: 1428 if (vp != NULL) 1429 vput(vp); 1430 free(sa, M_SONAME); 1431 UNP_LINK_WLOCK(); 1432 UNP_PCB_LOCK(unp); 1433 unp->unp_flags &= ~UNP_CONNECTING; 1434 UNP_PCB_UNLOCK(unp); 1435 return (error); 1436 } 1437 1438 static int 1439 unp_connect2(struct socket *so, struct socket *so2, int req) 1440 { 1441 struct unpcb *unp; 1442 struct unpcb *unp2; 1443 1444 unp = sotounpcb(so); 1445 KASSERT(unp != NULL, ("unp_connect2: unp == NULL")); 1446 unp2 = sotounpcb(so2); 1447 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL")); 1448 1449 UNP_LINK_WLOCK_ASSERT(); 1450 UNP_PCB_LOCK_ASSERT(unp); 1451 UNP_PCB_LOCK_ASSERT(unp2); 1452 1453 if (so2->so_type != so->so_type) 1454 return (EPROTOTYPE); 1455 unp2->unp_flags &= ~UNP_NASCENT; 1456 unp->unp_conn = unp2; 1457 1458 switch (so->so_type) { 1459 case SOCK_DGRAM: 1460 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); 1461 soisconnected(so); 1462 break; 1463 1464 case SOCK_STREAM: 1465 case SOCK_SEQPACKET: 1466 unp2->unp_conn = unp; 1467 if (req == PRU_CONNECT && 1468 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT)) 1469 soisconnecting(so); 1470 else 1471 soisconnected(so); 1472 soisconnected(so2); 1473 break; 1474 1475 default: 1476 panic("unp_connect2"); 1477 } 1478 return (0); 1479 } 1480 1481 static void 1482 unp_disconnect(struct unpcb *unp, struct unpcb *unp2) 1483 { 1484 struct socket *so; 1485 1486 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL")); 1487 1488 UNP_LINK_WLOCK_ASSERT(); 1489 UNP_PCB_LOCK_ASSERT(unp); 1490 UNP_PCB_LOCK_ASSERT(unp2); 1491 1492 unp->unp_conn = NULL; 1493 switch (unp->unp_socket->so_type) { 1494 case SOCK_DGRAM: 1495 LIST_REMOVE(unp, unp_reflink); 1496 so = unp->unp_socket; 1497 SOCK_LOCK(so); 1498 so->so_state &= ~SS_ISCONNECTED; 1499 SOCK_UNLOCK(so); 1500 break; 1501 1502 case SOCK_STREAM: 1503 case SOCK_SEQPACKET: 1504 soisdisconnected(unp->unp_socket); 1505 unp2->unp_conn = NULL; 1506 soisdisconnected(unp2->unp_socket); 1507 break; 1508 } 1509 } 1510 1511 /* 1512 * unp_pcblist() walks the global list of struct unpcb's to generate a 1513 * pointer list, bumping the refcount on each unpcb. It then copies them out 1514 * sequentially, validating the generation number on each to see if it has 1515 * been detached. All of this is necessary because copyout() may sleep on 1516 * disk I/O. 1517 */ 1518 static int 1519 unp_pcblist(SYSCTL_HANDLER_ARGS) 1520 { 1521 int error, i, n; 1522 int freeunp; 1523 struct unpcb *unp, **unp_list; 1524 unp_gen_t gencnt; 1525 struct xunpgen *xug; 1526 struct unp_head *head; 1527 struct xunpcb *xu; 1528 1529 switch ((intptr_t)arg1) { 1530 case SOCK_STREAM: 1531 head = &unp_shead; 1532 break; 1533 1534 case SOCK_DGRAM: 1535 head = &unp_dhead; 1536 break; 1537 1538 case SOCK_SEQPACKET: 1539 head = &unp_sphead; 1540 break; 1541 1542 default: 1543 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1); 1544 } 1545 1546 /* 1547 * The process of preparing the PCB list is too time-consuming and 1548 * resource-intensive to repeat twice on every request. 1549 */ 1550 if (req->oldptr == NULL) { 1551 n = unp_count; 1552 req->oldidx = 2 * (sizeof *xug) 1553 + (n + n/8) * sizeof(struct xunpcb); 1554 return (0); 1555 } 1556 1557 if (req->newptr != NULL) 1558 return (EPERM); 1559 1560 /* 1561 * OK, now we're committed to doing something. 1562 */ 1563 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK); 1564 UNP_LIST_LOCK(); 1565 gencnt = unp_gencnt; 1566 n = unp_count; 1567 UNP_LIST_UNLOCK(); 1568 1569 xug->xug_len = sizeof *xug; 1570 xug->xug_count = n; 1571 xug->xug_gen = gencnt; 1572 xug->xug_sogen = so_gencnt; 1573 error = SYSCTL_OUT(req, xug, sizeof *xug); 1574 if (error) { 1575 free(xug, M_TEMP); 1576 return (error); 1577 } 1578 1579 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK); 1580 1581 UNP_LIST_LOCK(); 1582 for (unp = LIST_FIRST(head), i = 0; unp && i < n; 1583 unp = LIST_NEXT(unp, unp_link)) { 1584 UNP_PCB_LOCK(unp); 1585 if (unp->unp_gencnt <= gencnt) { 1586 if (cr_cansee(req->td->td_ucred, 1587 unp->unp_socket->so_cred)) { 1588 UNP_PCB_UNLOCK(unp); 1589 continue; 1590 } 1591 unp_list[i++] = unp; 1592 unp->unp_refcount++; 1593 } 1594 UNP_PCB_UNLOCK(unp); 1595 } 1596 UNP_LIST_UNLOCK(); 1597 n = i; /* In case we lost some during malloc. */ 1598 1599 error = 0; 1600 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO); 1601 for (i = 0; i < n; i++) { 1602 unp = unp_list[i]; 1603 UNP_PCB_LOCK(unp); 1604 unp->unp_refcount--; 1605 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) { 1606 xu->xu_len = sizeof *xu; 1607 xu->xu_unpp = unp; 1608 /* 1609 * XXX - need more locking here to protect against 1610 * connect/disconnect races for SMP. 1611 */ 1612 if (unp->unp_addr != NULL) 1613 bcopy(unp->unp_addr, &xu->xu_addr, 1614 unp->unp_addr->sun_len); 1615 if (unp->unp_conn != NULL && 1616 unp->unp_conn->unp_addr != NULL) 1617 bcopy(unp->unp_conn->unp_addr, 1618 &xu->xu_caddr, 1619 unp->unp_conn->unp_addr->sun_len); 1620 bcopy(unp, &xu->xu_unp, sizeof *unp); 1621 sotoxsocket(unp->unp_socket, &xu->xu_socket); 1622 UNP_PCB_UNLOCK(unp); 1623 error = SYSCTL_OUT(req, xu, sizeof *xu); 1624 } else { 1625 freeunp = (unp->unp_refcount == 0); 1626 UNP_PCB_UNLOCK(unp); 1627 if (freeunp) { 1628 UNP_PCB_LOCK_DESTROY(unp); 1629 uma_zfree(unp_zone, unp); 1630 } 1631 } 1632 } 1633 free(xu, M_TEMP); 1634 if (!error) { 1635 /* 1636 * Give the user an updated idea of our state. If the 1637 * generation differs from what we told her before, she knows 1638 * that something happened while we were processing this 1639 * request, and it might be necessary to retry. 1640 */ 1641 xug->xug_gen = unp_gencnt; 1642 xug->xug_sogen = so_gencnt; 1643 xug->xug_count = unp_count; 1644 error = SYSCTL_OUT(req, xug, sizeof *xug); 1645 } 1646 free(unp_list, M_TEMP); 1647 free(xug, M_TEMP); 1648 return (error); 1649 } 1650 1651 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD, 1652 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", 1653 "List of active local datagram sockets"); 1654 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD, 1655 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb", 1656 "List of active local stream sockets"); 1657 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist, 1658 CTLTYPE_OPAQUE | CTLFLAG_RD, 1659 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb", 1660 "List of active local seqpacket sockets"); 1661 1662 static void 1663 unp_shutdown(struct unpcb *unp) 1664 { 1665 struct unpcb *unp2; 1666 struct socket *so; 1667 1668 UNP_LINK_WLOCK_ASSERT(); 1669 UNP_PCB_LOCK_ASSERT(unp); 1670 1671 unp2 = unp->unp_conn; 1672 if ((unp->unp_socket->so_type == SOCK_STREAM || 1673 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) { 1674 so = unp2->unp_socket; 1675 if (so != NULL) 1676 socantrcvmore(so); 1677 } 1678 } 1679 1680 static void 1681 unp_drop(struct unpcb *unp, int errno) 1682 { 1683 struct socket *so = unp->unp_socket; 1684 struct unpcb *unp2; 1685 1686 UNP_LINK_WLOCK_ASSERT(); 1687 UNP_PCB_LOCK_ASSERT(unp); 1688 1689 so->so_error = errno; 1690 unp2 = unp->unp_conn; 1691 if (unp2 == NULL) 1692 return; 1693 UNP_PCB_LOCK(unp2); 1694 unp_disconnect(unp, unp2); 1695 UNP_PCB_UNLOCK(unp2); 1696 } 1697 1698 static void 1699 unp_freerights(struct filedescent **fdep, int fdcount) 1700 { 1701 struct file *fp; 1702 int i; 1703 1704 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount)); 1705 1706 for (i = 0; i < fdcount; i++) { 1707 fp = fdep[i]->fde_file; 1708 filecaps_free(&fdep[i]->fde_caps); 1709 unp_discard(fp); 1710 } 1711 free(fdep[0], M_FILECAPS); 1712 } 1713 1714 static int 1715 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags) 1716 { 1717 struct thread *td = curthread; /* XXX */ 1718 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1719 int i; 1720 int *fdp; 1721 struct filedesc *fdesc = td->td_proc->p_fd; 1722 struct filedescent *fde, **fdep; 1723 void *data; 1724 socklen_t clen = control->m_len, datalen; 1725 int error, newfds; 1726 u_int newlen; 1727 1728 UNP_LINK_UNLOCK_ASSERT(); 1729 1730 error = 0; 1731 if (controlp != NULL) /* controlp == NULL => free control messages */ 1732 *controlp = NULL; 1733 while (cm != NULL) { 1734 if (sizeof(*cm) > clen || cm->cmsg_len > clen) { 1735 error = EINVAL; 1736 break; 1737 } 1738 data = CMSG_DATA(cm); 1739 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1740 if (cm->cmsg_level == SOL_SOCKET 1741 && cm->cmsg_type == SCM_RIGHTS) { 1742 newfds = datalen / sizeof(*fdep); 1743 if (newfds == 0) 1744 goto next; 1745 fdep = data; 1746 1747 /* If we're not outputting the descriptors free them. */ 1748 if (error || controlp == NULL) { 1749 unp_freerights(fdep, newfds); 1750 goto next; 1751 } 1752 FILEDESC_XLOCK(fdesc); 1753 1754 /* 1755 * Now change each pointer to an fd in the global 1756 * table to an integer that is the index to the local 1757 * fd table entry that we set up to point to the 1758 * global one we are transferring. 1759 */ 1760 newlen = newfds * sizeof(int); 1761 *controlp = sbcreatecontrol(NULL, newlen, 1762 SCM_RIGHTS, SOL_SOCKET); 1763 if (*controlp == NULL) { 1764 FILEDESC_XUNLOCK(fdesc); 1765 error = E2BIG; 1766 unp_freerights(fdep, newfds); 1767 goto next; 1768 } 1769 1770 fdp = (int *) 1771 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1772 if (fdallocn(td, 0, fdp, newfds) != 0) { 1773 FILEDESC_XUNLOCK(td->td_proc->p_fd); 1774 error = EMSGSIZE; 1775 unp_freerights(fdep, newfds); 1776 m_freem(*controlp); 1777 *controlp = NULL; 1778 goto next; 1779 } 1780 for (i = 0; i < newfds; i++, fdp++) { 1781 fde = &fdesc->fd_ofiles[*fdp]; 1782 fde->fde_file = fdep[i]->fde_file; 1783 filecaps_move(&fdep[i]->fde_caps, 1784 &fde->fde_caps); 1785 if ((flags & MSG_CMSG_CLOEXEC) != 0) 1786 fde->fde_flags |= UF_EXCLOSE; 1787 unp_externalize_fp(fde->fde_file); 1788 } 1789 FILEDESC_XUNLOCK(fdesc); 1790 free(fdep[0], M_FILECAPS); 1791 } else { 1792 /* We can just copy anything else across. */ 1793 if (error || controlp == NULL) 1794 goto next; 1795 *controlp = sbcreatecontrol(NULL, datalen, 1796 cm->cmsg_type, cm->cmsg_level); 1797 if (*controlp == NULL) { 1798 error = ENOBUFS; 1799 goto next; 1800 } 1801 bcopy(data, 1802 CMSG_DATA(mtod(*controlp, struct cmsghdr *)), 1803 datalen); 1804 } 1805 controlp = &(*controlp)->m_next; 1806 1807 next: 1808 if (CMSG_SPACE(datalen) < clen) { 1809 clen -= CMSG_SPACE(datalen); 1810 cm = (struct cmsghdr *) 1811 ((caddr_t)cm + CMSG_SPACE(datalen)); 1812 } else { 1813 clen = 0; 1814 cm = NULL; 1815 } 1816 } 1817 1818 m_freem(control); 1819 return (error); 1820 } 1821 1822 static void 1823 unp_zone_change(void *tag) 1824 { 1825 1826 uma_zone_set_max(unp_zone, maxsockets); 1827 } 1828 1829 static void 1830 unp_init(void) 1831 { 1832 1833 #ifdef VIMAGE 1834 if (!IS_DEFAULT_VNET(curvnet)) 1835 return; 1836 #endif 1837 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL, 1838 NULL, NULL, UMA_ALIGN_PTR, 0); 1839 if (unp_zone == NULL) 1840 panic("unp_init"); 1841 uma_zone_set_max(unp_zone, maxsockets); 1842 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached"); 1843 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change, 1844 NULL, EVENTHANDLER_PRI_ANY); 1845 LIST_INIT(&unp_dhead); 1846 LIST_INIT(&unp_shead); 1847 LIST_INIT(&unp_sphead); 1848 SLIST_INIT(&unp_defers); 1849 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL); 1850 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL); 1851 UNP_LINK_LOCK_INIT(); 1852 UNP_LIST_LOCK_INIT(); 1853 UNP_DEFERRED_LOCK_INIT(); 1854 } 1855 1856 static int 1857 unp_internalize(struct mbuf **controlp, struct thread *td) 1858 { 1859 struct mbuf *control = *controlp; 1860 struct proc *p = td->td_proc; 1861 struct filedesc *fdesc = p->p_fd; 1862 struct bintime *bt; 1863 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 1864 struct cmsgcred *cmcred; 1865 struct filedescent *fde, **fdep, *fdev; 1866 struct file *fp; 1867 struct timeval *tv; 1868 int i, *fdp; 1869 void *data; 1870 socklen_t clen = control->m_len, datalen; 1871 int error, oldfds; 1872 u_int newlen; 1873 1874 UNP_LINK_UNLOCK_ASSERT(); 1875 1876 error = 0; 1877 *controlp = NULL; 1878 while (cm != NULL) { 1879 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET 1880 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) { 1881 error = EINVAL; 1882 goto out; 1883 } 1884 data = CMSG_DATA(cm); 1885 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1886 1887 switch (cm->cmsg_type) { 1888 /* 1889 * Fill in credential information. 1890 */ 1891 case SCM_CREDS: 1892 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred), 1893 SCM_CREDS, SOL_SOCKET); 1894 if (*controlp == NULL) { 1895 error = ENOBUFS; 1896 goto out; 1897 } 1898 cmcred = (struct cmsgcred *) 1899 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1900 cmcred->cmcred_pid = p->p_pid; 1901 cmcred->cmcred_uid = td->td_ucred->cr_ruid; 1902 cmcred->cmcred_gid = td->td_ucred->cr_rgid; 1903 cmcred->cmcred_euid = td->td_ucred->cr_uid; 1904 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups, 1905 CMGROUP_MAX); 1906 for (i = 0; i < cmcred->cmcred_ngroups; i++) 1907 cmcred->cmcred_groups[i] = 1908 td->td_ucred->cr_groups[i]; 1909 break; 1910 1911 case SCM_RIGHTS: 1912 oldfds = datalen / sizeof (int); 1913 if (oldfds == 0) 1914 break; 1915 /* 1916 * Check that all the FDs passed in refer to legal 1917 * files. If not, reject the entire operation. 1918 */ 1919 fdp = data; 1920 FILEDESC_SLOCK(fdesc); 1921 for (i = 0; i < oldfds; i++, fdp++) { 1922 fp = fget_locked(fdesc, *fdp); 1923 if (fp == NULL) { 1924 FILEDESC_SUNLOCK(fdesc); 1925 error = EBADF; 1926 goto out; 1927 } 1928 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) { 1929 FILEDESC_SUNLOCK(fdesc); 1930 error = EOPNOTSUPP; 1931 goto out; 1932 } 1933 1934 } 1935 1936 /* 1937 * Now replace the integer FDs with pointers to the 1938 * file structure and capability rights. 1939 */ 1940 newlen = oldfds * sizeof(fdep[0]); 1941 *controlp = sbcreatecontrol(NULL, newlen, 1942 SCM_RIGHTS, SOL_SOCKET); 1943 if (*controlp == NULL) { 1944 FILEDESC_SUNLOCK(fdesc); 1945 error = E2BIG; 1946 goto out; 1947 } 1948 fdp = data; 1949 fdep = (struct filedescent **) 1950 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1951 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS, 1952 M_WAITOK); 1953 for (i = 0; i < oldfds; i++, fdev++, fdp++) { 1954 fde = &fdesc->fd_ofiles[*fdp]; 1955 fdep[i] = fdev; 1956 fdep[i]->fde_file = fde->fde_file; 1957 filecaps_copy(&fde->fde_caps, 1958 &fdep[i]->fde_caps); 1959 unp_internalize_fp(fdep[i]->fde_file); 1960 } 1961 FILEDESC_SUNLOCK(fdesc); 1962 break; 1963 1964 case SCM_TIMESTAMP: 1965 *controlp = sbcreatecontrol(NULL, sizeof(*tv), 1966 SCM_TIMESTAMP, SOL_SOCKET); 1967 if (*controlp == NULL) { 1968 error = ENOBUFS; 1969 goto out; 1970 } 1971 tv = (struct timeval *) 1972 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1973 microtime(tv); 1974 break; 1975 1976 case SCM_BINTIME: 1977 *controlp = sbcreatecontrol(NULL, sizeof(*bt), 1978 SCM_BINTIME, SOL_SOCKET); 1979 if (*controlp == NULL) { 1980 error = ENOBUFS; 1981 goto out; 1982 } 1983 bt = (struct bintime *) 1984 CMSG_DATA(mtod(*controlp, struct cmsghdr *)); 1985 bintime(bt); 1986 break; 1987 1988 default: 1989 error = EINVAL; 1990 goto out; 1991 } 1992 1993 controlp = &(*controlp)->m_next; 1994 if (CMSG_SPACE(datalen) < clen) { 1995 clen -= CMSG_SPACE(datalen); 1996 cm = (struct cmsghdr *) 1997 ((caddr_t)cm + CMSG_SPACE(datalen)); 1998 } else { 1999 clen = 0; 2000 cm = NULL; 2001 } 2002 } 2003 2004 out: 2005 m_freem(control); 2006 return (error); 2007 } 2008 2009 static struct mbuf * 2010 unp_addsockcred(struct thread *td, struct mbuf *control) 2011 { 2012 struct mbuf *m, *n, *n_prev; 2013 struct sockcred *sc; 2014 const struct cmsghdr *cm; 2015 int ngroups; 2016 int i; 2017 2018 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX); 2019 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET); 2020 if (m == NULL) 2021 return (control); 2022 2023 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *)); 2024 sc->sc_uid = td->td_ucred->cr_ruid; 2025 sc->sc_euid = td->td_ucred->cr_uid; 2026 sc->sc_gid = td->td_ucred->cr_rgid; 2027 sc->sc_egid = td->td_ucred->cr_gid; 2028 sc->sc_ngroups = ngroups; 2029 for (i = 0; i < sc->sc_ngroups; i++) 2030 sc->sc_groups[i] = td->td_ucred->cr_groups[i]; 2031 2032 /* 2033 * Unlink SCM_CREDS control messages (struct cmsgcred), since just 2034 * created SCM_CREDS control message (struct sockcred) has another 2035 * format. 2036 */ 2037 if (control != NULL) 2038 for (n = control, n_prev = NULL; n != NULL;) { 2039 cm = mtod(n, struct cmsghdr *); 2040 if (cm->cmsg_level == SOL_SOCKET && 2041 cm->cmsg_type == SCM_CREDS) { 2042 if (n_prev == NULL) 2043 control = n->m_next; 2044 else 2045 n_prev->m_next = n->m_next; 2046 n = m_free(n); 2047 } else { 2048 n_prev = n; 2049 n = n->m_next; 2050 } 2051 } 2052 2053 /* Prepend it to the head. */ 2054 m->m_next = control; 2055 return (m); 2056 } 2057 2058 static struct unpcb * 2059 fptounp(struct file *fp) 2060 { 2061 struct socket *so; 2062 2063 if (fp->f_type != DTYPE_SOCKET) 2064 return (NULL); 2065 if ((so = fp->f_data) == NULL) 2066 return (NULL); 2067 if (so->so_proto->pr_domain != &localdomain) 2068 return (NULL); 2069 return sotounpcb(so); 2070 } 2071 2072 static void 2073 unp_discard(struct file *fp) 2074 { 2075 struct unp_defer *dr; 2076 2077 if (unp_externalize_fp(fp)) { 2078 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK); 2079 dr->ud_fp = fp; 2080 UNP_DEFERRED_LOCK(); 2081 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link); 2082 UNP_DEFERRED_UNLOCK(); 2083 atomic_add_int(&unp_defers_count, 1); 2084 taskqueue_enqueue(taskqueue_thread, &unp_defer_task); 2085 } else 2086 (void) closef(fp, (struct thread *)NULL); 2087 } 2088 2089 static void 2090 unp_process_defers(void *arg __unused, int pending) 2091 { 2092 struct unp_defer *dr; 2093 SLIST_HEAD(, unp_defer) drl; 2094 int count; 2095 2096 SLIST_INIT(&drl); 2097 for (;;) { 2098 UNP_DEFERRED_LOCK(); 2099 if (SLIST_FIRST(&unp_defers) == NULL) { 2100 UNP_DEFERRED_UNLOCK(); 2101 break; 2102 } 2103 SLIST_SWAP(&unp_defers, &drl, unp_defer); 2104 UNP_DEFERRED_UNLOCK(); 2105 count = 0; 2106 while ((dr = SLIST_FIRST(&drl)) != NULL) { 2107 SLIST_REMOVE_HEAD(&drl, ud_link); 2108 closef(dr->ud_fp, NULL); 2109 free(dr, M_TEMP); 2110 count++; 2111 } 2112 atomic_add_int(&unp_defers_count, -count); 2113 } 2114 } 2115 2116 static void 2117 unp_internalize_fp(struct file *fp) 2118 { 2119 struct unpcb *unp; 2120 2121 UNP_LINK_WLOCK(); 2122 if ((unp = fptounp(fp)) != NULL) { 2123 unp->unp_file = fp; 2124 unp->unp_msgcount++; 2125 } 2126 fhold(fp); 2127 unp_rights++; 2128 UNP_LINK_WUNLOCK(); 2129 } 2130 2131 static int 2132 unp_externalize_fp(struct file *fp) 2133 { 2134 struct unpcb *unp; 2135 int ret; 2136 2137 UNP_LINK_WLOCK(); 2138 if ((unp = fptounp(fp)) != NULL) { 2139 unp->unp_msgcount--; 2140 ret = 1; 2141 } else 2142 ret = 0; 2143 unp_rights--; 2144 UNP_LINK_WUNLOCK(); 2145 return (ret); 2146 } 2147 2148 /* 2149 * unp_defer indicates whether additional work has been defered for a future 2150 * pass through unp_gc(). It is thread local and does not require explicit 2151 * synchronization. 2152 */ 2153 static int unp_marked; 2154 static int unp_unreachable; 2155 2156 static void 2157 unp_accessable(struct filedescent **fdep, int fdcount) 2158 { 2159 struct unpcb *unp; 2160 struct file *fp; 2161 int i; 2162 2163 for (i = 0; i < fdcount; i++) { 2164 fp = fdep[i]->fde_file; 2165 if ((unp = fptounp(fp)) == NULL) 2166 continue; 2167 if (unp->unp_gcflag & UNPGC_REF) 2168 continue; 2169 unp->unp_gcflag &= ~UNPGC_DEAD; 2170 unp->unp_gcflag |= UNPGC_REF; 2171 unp_marked++; 2172 } 2173 } 2174 2175 static void 2176 unp_gc_process(struct unpcb *unp) 2177 { 2178 struct socket *soa; 2179 struct socket *so; 2180 struct file *fp; 2181 2182 /* Already processed. */ 2183 if (unp->unp_gcflag & UNPGC_SCANNED) 2184 return; 2185 fp = unp->unp_file; 2186 2187 /* 2188 * Check for a socket potentially in a cycle. It must be in a 2189 * queue as indicated by msgcount, and this must equal the file 2190 * reference count. Note that when msgcount is 0 the file is NULL. 2191 */ 2192 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp && 2193 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) { 2194 unp->unp_gcflag |= UNPGC_DEAD; 2195 unp_unreachable++; 2196 return; 2197 } 2198 2199 /* 2200 * Mark all sockets we reference with RIGHTS. 2201 */ 2202 so = unp->unp_socket; 2203 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) { 2204 SOCKBUF_LOCK(&so->so_rcv); 2205 unp_scan(so->so_rcv.sb_mb, unp_accessable); 2206 SOCKBUF_UNLOCK(&so->so_rcv); 2207 } 2208 2209 /* 2210 * Mark all sockets in our accept queue. 2211 */ 2212 ACCEPT_LOCK(); 2213 TAILQ_FOREACH(soa, &so->so_comp, so_list) { 2214 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0) 2215 continue; 2216 SOCKBUF_LOCK(&soa->so_rcv); 2217 unp_scan(soa->so_rcv.sb_mb, unp_accessable); 2218 SOCKBUF_UNLOCK(&soa->so_rcv); 2219 } 2220 ACCEPT_UNLOCK(); 2221 unp->unp_gcflag |= UNPGC_SCANNED; 2222 } 2223 2224 static int unp_recycled; 2225 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0, 2226 "Number of unreachable sockets claimed by the garbage collector."); 2227 2228 static int unp_taskcount; 2229 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0, 2230 "Number of times the garbage collector has run."); 2231 2232 static void 2233 unp_gc(__unused void *arg, int pending) 2234 { 2235 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead, 2236 NULL }; 2237 struct unp_head **head; 2238 struct file *f, **unref; 2239 struct unpcb *unp; 2240 int i, total; 2241 2242 unp_taskcount++; 2243 UNP_LIST_LOCK(); 2244 /* 2245 * First clear all gc flags from previous runs, apart from 2246 * UNPGC_IGNORE_RIGHTS. 2247 */ 2248 for (head = heads; *head != NULL; head++) 2249 LIST_FOREACH(unp, *head, unp_link) 2250 unp->unp_gcflag = 2251 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS); 2252 2253 /* 2254 * Scan marking all reachable sockets with UNPGC_REF. Once a socket 2255 * is reachable all of the sockets it references are reachable. 2256 * Stop the scan once we do a complete loop without discovering 2257 * a new reachable socket. 2258 */ 2259 do { 2260 unp_unreachable = 0; 2261 unp_marked = 0; 2262 for (head = heads; *head != NULL; head++) 2263 LIST_FOREACH(unp, *head, unp_link) 2264 unp_gc_process(unp); 2265 } while (unp_marked); 2266 UNP_LIST_UNLOCK(); 2267 if (unp_unreachable == 0) 2268 return; 2269 2270 /* 2271 * Allocate space for a local list of dead unpcbs. 2272 */ 2273 unref = malloc(unp_unreachable * sizeof(struct file *), 2274 M_TEMP, M_WAITOK); 2275 2276 /* 2277 * Iterate looking for sockets which have been specifically marked 2278 * as as unreachable and store them locally. 2279 */ 2280 UNP_LINK_RLOCK(); 2281 UNP_LIST_LOCK(); 2282 for (total = 0, head = heads; *head != NULL; head++) 2283 LIST_FOREACH(unp, *head, unp_link) 2284 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) { 2285 f = unp->unp_file; 2286 if (unp->unp_msgcount == 0 || f == NULL || 2287 f->f_count != unp->unp_msgcount) 2288 continue; 2289 unref[total++] = f; 2290 fhold(f); 2291 KASSERT(total <= unp_unreachable, 2292 ("unp_gc: incorrect unreachable count.")); 2293 } 2294 UNP_LIST_UNLOCK(); 2295 UNP_LINK_RUNLOCK(); 2296 2297 /* 2298 * Now flush all sockets, free'ing rights. This will free the 2299 * struct files associated with these sockets but leave each socket 2300 * with one remaining ref. 2301 */ 2302 for (i = 0; i < total; i++) { 2303 struct socket *so; 2304 2305 so = unref[i]->f_data; 2306 CURVNET_SET(so->so_vnet); 2307 sorflush(so); 2308 CURVNET_RESTORE(); 2309 } 2310 2311 /* 2312 * And finally release the sockets so they can be reclaimed. 2313 */ 2314 for (i = 0; i < total; i++) 2315 fdrop(unref[i], NULL); 2316 unp_recycled += total; 2317 free(unref, M_TEMP); 2318 } 2319 2320 static void 2321 unp_dispose(struct mbuf *m) 2322 { 2323 2324 if (m) 2325 unp_scan(m, unp_freerights); 2326 } 2327 2328 /* 2329 * Synchronize against unp_gc, which can trip over data as we are freeing it. 2330 */ 2331 void 2332 unp_dispose_so(struct socket *so) 2333 { 2334 struct unpcb *unp; 2335 2336 unp = sotounpcb(so); 2337 UNP_LIST_LOCK(); 2338 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS; 2339 UNP_LIST_UNLOCK(); 2340 unp_dispose(so->so_rcv.sb_mb); 2341 } 2342 2343 static void 2344 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int)) 2345 { 2346 struct mbuf *m; 2347 struct cmsghdr *cm; 2348 void *data; 2349 socklen_t clen, datalen; 2350 2351 while (m0 != NULL) { 2352 for (m = m0; m; m = m->m_next) { 2353 if (m->m_type != MT_CONTROL) 2354 continue; 2355 2356 cm = mtod(m, struct cmsghdr *); 2357 clen = m->m_len; 2358 2359 while (cm != NULL) { 2360 if (sizeof(*cm) > clen || cm->cmsg_len > clen) 2361 break; 2362 2363 data = CMSG_DATA(cm); 2364 datalen = (caddr_t)cm + cm->cmsg_len 2365 - (caddr_t)data; 2366 2367 if (cm->cmsg_level == SOL_SOCKET && 2368 cm->cmsg_type == SCM_RIGHTS) { 2369 (*op)(data, datalen / 2370 sizeof(struct filedescent *)); 2371 } 2372 2373 if (CMSG_SPACE(datalen) < clen) { 2374 clen -= CMSG_SPACE(datalen); 2375 cm = (struct cmsghdr *) 2376 ((caddr_t)cm + CMSG_SPACE(datalen)); 2377 } else { 2378 clen = 0; 2379 cm = NULL; 2380 } 2381 } 2382 } 2383 m0 = m0->m_nextpkt; 2384 } 2385 } 2386 2387 /* 2388 * A helper function called by VFS before socket-type vnode reclamation. 2389 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode 2390 * use count. 2391 */ 2392 void 2393 vfs_unp_reclaim(struct vnode *vp) 2394 { 2395 struct socket *so; 2396 struct unpcb *unp; 2397 int active; 2398 2399 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim"); 2400 KASSERT(vp->v_type == VSOCK, 2401 ("vfs_unp_reclaim: vp->v_type != VSOCK")); 2402 2403 active = 0; 2404 UNP_LINK_WLOCK(); 2405 VOP_UNP_CONNECT(vp, &so); 2406 if (so == NULL) 2407 goto done; 2408 unp = sotounpcb(so); 2409 if (unp == NULL) 2410 goto done; 2411 UNP_PCB_LOCK(unp); 2412 if (unp->unp_vnode == vp) { 2413 VOP_UNP_DETACH(vp); 2414 unp->unp_vnode = NULL; 2415 active = 1; 2416 } 2417 UNP_PCB_UNLOCK(unp); 2418 done: 2419 UNP_LINK_WUNLOCK(); 2420 if (active) 2421 vunref(vp); 2422 } 2423 2424 #ifdef DDB 2425 static void 2426 db_print_indent(int indent) 2427 { 2428 int i; 2429 2430 for (i = 0; i < indent; i++) 2431 db_printf(" "); 2432 } 2433 2434 static void 2435 db_print_unpflags(int unp_flags) 2436 { 2437 int comma; 2438 2439 comma = 0; 2440 if (unp_flags & UNP_HAVEPC) { 2441 db_printf("%sUNP_HAVEPC", comma ? ", " : ""); 2442 comma = 1; 2443 } 2444 if (unp_flags & UNP_HAVEPCCACHED) { 2445 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : ""); 2446 comma = 1; 2447 } 2448 if (unp_flags & UNP_WANTCRED) { 2449 db_printf("%sUNP_WANTCRED", comma ? ", " : ""); 2450 comma = 1; 2451 } 2452 if (unp_flags & UNP_CONNWAIT) { 2453 db_printf("%sUNP_CONNWAIT", comma ? ", " : ""); 2454 comma = 1; 2455 } 2456 if (unp_flags & UNP_CONNECTING) { 2457 db_printf("%sUNP_CONNECTING", comma ? ", " : ""); 2458 comma = 1; 2459 } 2460 if (unp_flags & UNP_BINDING) { 2461 db_printf("%sUNP_BINDING", comma ? ", " : ""); 2462 comma = 1; 2463 } 2464 } 2465 2466 static void 2467 db_print_xucred(int indent, struct xucred *xu) 2468 { 2469 int comma, i; 2470 2471 db_print_indent(indent); 2472 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n", 2473 xu->cr_version, xu->cr_uid, xu->cr_ngroups); 2474 db_print_indent(indent); 2475 db_printf("cr_groups: "); 2476 comma = 0; 2477 for (i = 0; i < xu->cr_ngroups; i++) { 2478 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]); 2479 comma = 1; 2480 } 2481 db_printf("\n"); 2482 } 2483 2484 static void 2485 db_print_unprefs(int indent, struct unp_head *uh) 2486 { 2487 struct unpcb *unp; 2488 int counter; 2489 2490 counter = 0; 2491 LIST_FOREACH(unp, uh, unp_reflink) { 2492 if (counter % 4 == 0) 2493 db_print_indent(indent); 2494 db_printf("%p ", unp); 2495 if (counter % 4 == 3) 2496 db_printf("\n"); 2497 counter++; 2498 } 2499 if (counter != 0 && counter % 4 != 0) 2500 db_printf("\n"); 2501 } 2502 2503 DB_SHOW_COMMAND(unpcb, db_show_unpcb) 2504 { 2505 struct unpcb *unp; 2506 2507 if (!have_addr) { 2508 db_printf("usage: show unpcb <addr>\n"); 2509 return; 2510 } 2511 unp = (struct unpcb *)addr; 2512 2513 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket, 2514 unp->unp_vnode); 2515 2516 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino, 2517 unp->unp_conn); 2518 2519 db_printf("unp_refs:\n"); 2520 db_print_unprefs(2, &unp->unp_refs); 2521 2522 /* XXXRW: Would be nice to print the full address, if any. */ 2523 db_printf("unp_addr: %p\n", unp->unp_addr); 2524 2525 db_printf("unp_gencnt: %llu\n", 2526 (unsigned long long)unp->unp_gencnt); 2527 2528 db_printf("unp_flags: %x (", unp->unp_flags); 2529 db_print_unpflags(unp->unp_flags); 2530 db_printf(")\n"); 2531 2532 db_printf("unp_peercred:\n"); 2533 db_print_xucred(2, &unp->unp_peercred); 2534 2535 db_printf("unp_refcount: %u\n", unp->unp_refcount); 2536 } 2537 #endif
Cache object: 4829c602954efac1239017f6c4281771
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