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