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