sys/kern/uipc_usrreq.c

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