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