The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/uipc_usrreq.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
    3  *      The Regents of the University of California.
    4  * Copyright (c) 2004-2009 Robert N. M. Watson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 4. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
   32  */
   33 
   34 /*
   35  * UNIX Domain (Local) Sockets
   36  *
   37  * This is an implementation of UNIX (local) domain sockets.  Each socket has
   38  * an associated struct unpcb (UNIX protocol control block).  Stream sockets
   39  * may be connected to 0 or 1 other socket.  Datagram sockets may be
   40  * connected to 0, 1, or many other sockets.  Sockets may be created and
   41  * connected in pairs (socketpair(2)), or bound/connected to using the file
   42  * system name space.  For most purposes, only the receive socket buffer is
   43  * used, as sending on one socket delivers directly to the receive socket
   44  * buffer of a second socket.
   45  *
   46  * The implementation is substantially complicated by the fact that
   47  * "ancillary data", such as file descriptors or credentials, may be passed
   48  * across UNIX domain sockets.  The potential for passing UNIX domain sockets
   49  * over other UNIX domain sockets requires the implementation of a simple
   50  * garbage collector to find and tear down cycles of disconnected sockets.
   51  *
   52  * TODO:
   53  *      RDM
   54  *      distinguish datagram size limits from flow control limits in SEQPACKET
   55  *      rethink name space problems
   56  *      need a proper out-of-band
   57  */
   58 
   59 #include <sys/cdefs.h>
   60 __FBSDID("$FreeBSD: releng/9.0/sys/kern/uipc_usrreq.c 225827 2011-09-28 08:47:17Z bz $");
   61 
   62 #include "opt_ddb.h"
   63 
   64 #include <sys/param.h>
   65 #include <sys/domain.h>
   66 #include <sys/fcntl.h>
   67 #include <sys/malloc.h>         /* XXX must be before <sys/file.h> */
   68 #include <sys/eventhandler.h>
   69 #include <sys/file.h>
   70 #include <sys/filedesc.h>
   71 #include <sys/kernel.h>
   72 #include <sys/lock.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/mount.h>
   75 #include <sys/mutex.h>
   76 #include <sys/namei.h>
   77 #include <sys/proc.h>
   78 #include <sys/protosw.h>
   79 #include <sys/queue.h>
   80 #include <sys/resourcevar.h>
   81 #include <sys/rwlock.h>
   82 #include <sys/socket.h>
   83 #include <sys/socketvar.h>
   84 #include <sys/signalvar.h>
   85 #include <sys/stat.h>
   86 #include <sys/sx.h>
   87 #include <sys/sysctl.h>
   88 #include <sys/systm.h>
   89 #include <sys/taskqueue.h>
   90 #include <sys/un.h>
   91 #include <sys/unpcb.h>
   92 #include <sys/vnode.h>
   93 
   94 #include <net/vnet.h>
   95 
   96 #ifdef DDB
   97 #include <ddb/ddb.h>
   98 #endif
   99 
  100 #include <security/mac/mac_framework.h>
  101 
  102 #include <vm/uma.h>
  103 
  104 /*
  105  * Locking key:
  106  * (l)  Locked using list lock
  107  * (g)  Locked using linkage lock
  108  */
  109 
  110 static uma_zone_t       unp_zone;
  111 static unp_gen_t        unp_gencnt;     /* (l) */
  112 static u_int            unp_count;      /* (l) Count of local sockets. */
  113 static ino_t            unp_ino;        /* Prototype for fake inode numbers. */
  114 static int              unp_rights;     /* (g) File descriptors in flight. */
  115 static struct unp_head  unp_shead;      /* (l) List of stream sockets. */
  116 static struct unp_head  unp_dhead;      /* (l) List of datagram sockets. */
  117 static struct unp_head  unp_sphead;     /* (l) List of seqpacket sockets. */
  118 
  119 struct unp_defer {
  120         SLIST_ENTRY(unp_defer) ud_link;
  121         struct file *ud_fp;
  122 };
  123 static SLIST_HEAD(, unp_defer) unp_defers;
  124 static int unp_defers_count;
  125 
  126 static const struct sockaddr    sun_noname = { sizeof(sun_noname), AF_LOCAL };
  127 
  128 /*
  129  * Garbage collection of cyclic file descriptor/socket references occurs
  130  * asynchronously in a taskqueue context in order to avoid recursion and
  131  * reentrance in the UNIX domain socket, file descriptor, and socket layer
  132  * code.  See unp_gc() for a full description.
  133  */
  134 static struct task      unp_gc_task;
  135 
  136 /*
  137  * The close of unix domain sockets attached as SCM_RIGHTS is
  138  * postponed to the taskqueue, to avoid arbitrary recursion depth.
  139  * The attached sockets might have another sockets attached.
  140  */
  141 static struct task      unp_defer_task;
  142 
  143 /*
  144  * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
  145  * stream sockets, although the total for sender and receiver is actually
  146  * only PIPSIZ.
  147  *
  148  * Datagram sockets really use the sendspace as the maximum datagram size,
  149  * and don't really want to reserve the sendspace.  Their recvspace should be
  150  * large enough for at least one max-size datagram plus address.
  151  */
  152 #ifndef PIPSIZ
  153 #define PIPSIZ  8192
  154 #endif
  155 static u_long   unpst_sendspace = PIPSIZ;
  156 static u_long   unpst_recvspace = PIPSIZ;
  157 static u_long   unpdg_sendspace = 2*1024;       /* really max datagram size */
  158 static u_long   unpdg_recvspace = 4*1024;
  159 static u_long   unpsp_sendspace = PIPSIZ;       /* really max datagram size */
  160 static u_long   unpsp_recvspace = PIPSIZ;
  161 
  162 SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
  163 SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0, "SOCK_STREAM");
  164 SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
  165 SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
  166     "SOCK_SEQPACKET");
  167 
  168 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
  169            &unpst_sendspace, 0, "Default stream send space.");
  170 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
  171            &unpst_recvspace, 0, "Default stream receive space.");
  172 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
  173            &unpdg_sendspace, 0, "Default datagram send space.");
  174 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
  175            &unpdg_recvspace, 0, "Default datagram receive space.");
  176 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
  177            &unpsp_sendspace, 0, "Default seqpacket send space.");
  178 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
  179            &unpsp_recvspace, 0, "Default seqpacket receive space.");
  180 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
  181     "File descriptors in flight.");
  182 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
  183     &unp_defers_count, 0,
  184     "File descriptors deferred to taskqueue for close.");
  185 
  186 /*
  187  * Locking and synchronization:
  188  *
  189  * Three types of locks exit in the local domain socket implementation: a
  190  * global list mutex, a global linkage rwlock, and per-unpcb mutexes.  Of the
  191  * global locks, the list lock protects the socket count, global generation
  192  * number, and stream/datagram global lists.  The linkage lock protects the
  193  * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
  194  * held exclusively over the acquisition of multiple unpcb locks to prevent
  195  * deadlock.
  196  *
  197  * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
  198  * allocated in pru_attach() and freed in pru_detach().  The validity of that
  199  * pointer is an invariant, so no lock is required to dereference the so_pcb
  200  * pointer if a valid socket reference is held by the caller.  In practice,
  201  * this is always true during operations performed on a socket.  Each unpcb
  202  * has a back-pointer to its socket, unp_socket, which will be stable under
  203  * the same circumstances.
  204  *
  205  * This pointer may only be safely dereferenced as long as a valid reference
  206  * to the unpcb is held.  Typically, this reference will be from the socket,
  207  * or from another unpcb when the referring unpcb's lock is held (in order
  208  * that the reference not be invalidated during use).  For example, to follow
  209  * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
  210  * as unp_socket remains valid as long as the reference to unp_conn is valid.
  211  *
  212  * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx.  Individual
  213  * atomic reads without the lock may be performed "lockless", but more
  214  * complex reads and read-modify-writes require the mutex to be held.  No
  215  * lock order is defined between unpcb locks -- multiple unpcb locks may be
  216  * acquired at the same time only when holding the linkage rwlock
  217  * exclusively, which prevents deadlocks.
  218  *
  219  * Blocking with UNIX domain sockets is a tricky issue: unlike most network
  220  * protocols, bind() is a non-atomic operation, and connect() requires
  221  * potential sleeping in the protocol, due to potentially waiting on local or
  222  * distributed file systems.  We try to separate "lookup" operations, which
  223  * may sleep, and the IPC operations themselves, which typically can occur
  224  * with relative atomicity as locks can be held over the entire operation.
  225  *
  226  * Another tricky issue is simultaneous multi-threaded or multi-process
  227  * access to a single UNIX domain socket.  These are handled by the flags
  228  * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
  229  * binding, both of which involve dropping UNIX domain socket locks in order
  230  * to perform namei() and other file system operations.
  231  */
  232 static struct rwlock    unp_link_rwlock;
  233 static struct mtx       unp_list_lock;
  234 static struct mtx       unp_defers_lock;
  235 
  236 #define UNP_LINK_LOCK_INIT()            rw_init(&unp_link_rwlock,       \
  237                                             "unp_link_rwlock")
  238 
  239 #define UNP_LINK_LOCK_ASSERT()  rw_assert(&unp_link_rwlock,     \
  240                                             RA_LOCKED)
  241 #define UNP_LINK_UNLOCK_ASSERT()        rw_assert(&unp_link_rwlock,     \
  242                                             RA_UNLOCKED)
  243 
  244 #define UNP_LINK_RLOCK()                rw_rlock(&unp_link_rwlock)
  245 #define UNP_LINK_RUNLOCK()              rw_runlock(&unp_link_rwlock)
  246 #define UNP_LINK_WLOCK()                rw_wlock(&unp_link_rwlock)
  247 #define UNP_LINK_WUNLOCK()              rw_wunlock(&unp_link_rwlock)
  248 #define UNP_LINK_WLOCK_ASSERT()         rw_assert(&unp_link_rwlock,     \
  249                                             RA_WLOCKED)
  250 
  251 #define UNP_LIST_LOCK_INIT()            mtx_init(&unp_list_lock,        \
  252                                             "unp_list_lock", NULL, MTX_DEF)
  253 #define UNP_LIST_LOCK()                 mtx_lock(&unp_list_lock)
  254 #define UNP_LIST_UNLOCK()               mtx_unlock(&unp_list_lock)
  255 
  256 #define UNP_DEFERRED_LOCK_INIT()        mtx_init(&unp_defers_lock, \
  257                                             "unp_defer", NULL, MTX_DEF)
  258 #define UNP_DEFERRED_LOCK()             mtx_lock(&unp_defers_lock)
  259 #define UNP_DEFERRED_UNLOCK()           mtx_unlock(&unp_defers_lock)
  260 
  261 #define UNP_PCB_LOCK_INIT(unp)          mtx_init(&(unp)->unp_mtx,       \
  262                                             "unp_mtx", "unp_mtx",       \
  263                                             MTX_DUPOK|MTX_DEF|MTX_RECURSE)
  264 #define UNP_PCB_LOCK_DESTROY(unp)       mtx_destroy(&(unp)->unp_mtx)
  265 #define UNP_PCB_LOCK(unp)               mtx_lock(&(unp)->unp_mtx)
  266 #define UNP_PCB_UNLOCK(unp)             mtx_unlock(&(unp)->unp_mtx)
  267 #define UNP_PCB_LOCK_ASSERT(unp)        mtx_assert(&(unp)->unp_mtx, MA_OWNED)
  268 
  269 static int      uipc_connect2(struct socket *, struct socket *);
  270 static int      uipc_ctloutput(struct socket *, struct sockopt *);
  271 static int      unp_connect(struct socket *, struct sockaddr *,
  272                     struct thread *);
  273 static int      unp_connect2(struct socket *so, struct socket *so2, int);
  274 static void     unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
  275 static void     unp_dispose(struct mbuf *);
  276 static void     unp_shutdown(struct unpcb *);
  277 static void     unp_drop(struct unpcb *, int);
  278 static void     unp_gc(__unused void *, int);
  279 static void     unp_scan(struct mbuf *, void (*)(struct file *));
  280 static void     unp_discard(struct file *);
  281 static void     unp_freerights(struct file **, int);
  282 static void     unp_init(void);
  283 static int      unp_internalize(struct mbuf **, struct thread *);
  284 static void     unp_internalize_fp(struct file *);
  285 static int      unp_externalize(struct mbuf *, struct mbuf **);
  286 static int      unp_externalize_fp(struct file *);
  287 static struct mbuf      *unp_addsockcred(struct thread *, struct mbuf *);
  288 static void     unp_process_defers(void * __unused, int);
  289 
  290 /*
  291  * Definitions of protocols supported in the LOCAL domain.
  292  */
  293 static struct domain localdomain;
  294 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
  295 static struct pr_usrreqs uipc_usrreqs_seqpacket;
  296 static struct protosw localsw[] = {
  297 {
  298         .pr_type =              SOCK_STREAM,
  299         .pr_domain =            &localdomain,
  300         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
  301         .pr_ctloutput =         &uipc_ctloutput,
  302         .pr_usrreqs =           &uipc_usrreqs_stream
  303 },
  304 {
  305         .pr_type =              SOCK_DGRAM,
  306         .pr_domain =            &localdomain,
  307         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_RIGHTS,
  308         .pr_usrreqs =           &uipc_usrreqs_dgram
  309 },
  310 {
  311         .pr_type =              SOCK_SEQPACKET,
  312         .pr_domain =            &localdomain,
  313 
  314         /*
  315          * XXXRW: For now, PR_ADDR because soreceive will bump into them
  316          * due to our use of sbappendaddr.  A new sbappend variants is needed
  317          * that supports both atomic record writes and control data.
  318          */
  319         .pr_flags =             PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
  320                                     PR_RIGHTS,
  321         .pr_usrreqs =           &uipc_usrreqs_seqpacket,
  322 },
  323 };
  324 
  325 static struct domain localdomain = {
  326         .dom_family =           AF_LOCAL,
  327         .dom_name =             "local",
  328         .dom_init =             unp_init,
  329         .dom_externalize =      unp_externalize,
  330         .dom_dispose =          unp_dispose,
  331         .dom_protosw =          localsw,
  332         .dom_protoswNPROTOSW =  &localsw[sizeof(localsw)/sizeof(localsw[0])]
  333 };
  334 DOMAIN_SET(local);
  335 
  336 static void
  337 uipc_abort(struct socket *so)
  338 {
  339         struct unpcb *unp, *unp2;
  340 
  341         unp = sotounpcb(so);
  342         KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
  343 
  344         UNP_LINK_WLOCK();
  345         UNP_PCB_LOCK(unp);
  346         unp2 = unp->unp_conn;
  347         if (unp2 != NULL) {
  348                 UNP_PCB_LOCK(unp2);
  349                 unp_drop(unp2, ECONNABORTED);
  350                 UNP_PCB_UNLOCK(unp2);
  351         }
  352         UNP_PCB_UNLOCK(unp);
  353         UNP_LINK_WUNLOCK();
  354 }
  355 
  356 static int
  357 uipc_accept(struct socket *so, struct sockaddr **nam)
  358 {
  359         struct unpcb *unp, *unp2;
  360         const struct sockaddr *sa;
  361 
  362         /*
  363          * Pass back name of connected socket, if it was bound and we are
  364          * still connected (our peer may have closed already!).
  365          */
  366         unp = sotounpcb(so);
  367         KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
  368 
  369         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
  370         UNP_LINK_RLOCK();
  371         unp2 = unp->unp_conn;
  372         if (unp2 != NULL && unp2->unp_addr != NULL) {
  373                 UNP_PCB_LOCK(unp2);
  374                 sa = (struct sockaddr *) unp2->unp_addr;
  375                 bcopy(sa, *nam, sa->sa_len);
  376                 UNP_PCB_UNLOCK(unp2);
  377         } else {
  378                 sa = &sun_noname;
  379                 bcopy(sa, *nam, sa->sa_len);
  380         }
  381         UNP_LINK_RUNLOCK();
  382         return (0);
  383 }
  384 
  385 static int
  386 uipc_attach(struct socket *so, int proto, struct thread *td)
  387 {
  388         u_long sendspace, recvspace;
  389         struct unpcb *unp;
  390         int error;
  391 
  392         KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
  393         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  394                 switch (so->so_type) {
  395                 case SOCK_STREAM:
  396                         sendspace = unpst_sendspace;
  397                         recvspace = unpst_recvspace;
  398                         break;
  399 
  400                 case SOCK_DGRAM:
  401                         sendspace = unpdg_sendspace;
  402                         recvspace = unpdg_recvspace;
  403                         break;
  404 
  405                 case SOCK_SEQPACKET:
  406                         sendspace = unpsp_sendspace;
  407                         recvspace = unpsp_recvspace;
  408                         break;
  409 
  410                 default:
  411                         panic("uipc_attach");
  412                 }
  413                 error = soreserve(so, sendspace, recvspace);
  414                 if (error)
  415                         return (error);
  416         }
  417         unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
  418         if (unp == NULL)
  419                 return (ENOBUFS);
  420         LIST_INIT(&unp->unp_refs);
  421         UNP_PCB_LOCK_INIT(unp);
  422         unp->unp_socket = so;
  423         so->so_pcb = unp;
  424         unp->unp_refcount = 1;
  425 
  426         UNP_LIST_LOCK();
  427         unp->unp_gencnt = ++unp_gencnt;
  428         unp_count++;
  429         switch (so->so_type) {
  430         case SOCK_STREAM:
  431                 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
  432                 break;
  433 
  434         case SOCK_DGRAM:
  435                 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
  436                 break;
  437 
  438         case SOCK_SEQPACKET:
  439                 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
  440                 break;
  441 
  442         default:
  443                 panic("uipc_attach");
  444         }
  445         UNP_LIST_UNLOCK();
  446 
  447         return (0);
  448 }
  449 
  450 static int
  451 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  452 {
  453         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
  454         struct vattr vattr;
  455         int error, namelen, vfslocked;
  456         struct nameidata nd;
  457         struct unpcb *unp;
  458         struct vnode *vp;
  459         struct mount *mp;
  460         char *buf;
  461 
  462         unp = sotounpcb(so);
  463         KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
  464 
  465         if (soun->sun_len > sizeof(struct sockaddr_un))
  466                 return (EINVAL);
  467         namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
  468         if (namelen <= 0)
  469                 return (EINVAL);
  470 
  471         /*
  472          * We don't allow simultaneous bind() calls on a single UNIX domain
  473          * socket, so flag in-progress operations, and return an error if an
  474          * operation is already in progress.
  475          *
  476          * Historically, we have not allowed a socket to be rebound, so this
  477          * also returns an error.  Not allowing re-binding simplifies the
  478          * implementation and avoids a great many possible failure modes.
  479          */
  480         UNP_PCB_LOCK(unp);
  481         if (unp->unp_vnode != NULL) {
  482                 UNP_PCB_UNLOCK(unp);
  483                 return (EINVAL);
  484         }
  485         if (unp->unp_flags & UNP_BINDING) {
  486                 UNP_PCB_UNLOCK(unp);
  487                 return (EALREADY);
  488         }
  489         unp->unp_flags |= UNP_BINDING;
  490         UNP_PCB_UNLOCK(unp);
  491 
  492         buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
  493         bcopy(soun->sun_path, buf, namelen);
  494         buf[namelen] = 0;
  495 
  496 restart:
  497         vfslocked = 0;
  498         NDINIT(&nd, CREATE, MPSAFE | NOFOLLOW | LOCKPARENT | SAVENAME,
  499             UIO_SYSSPACE, buf, td);
  500 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
  501         error = namei(&nd);
  502         if (error)
  503                 goto error;
  504         vp = nd.ni_vp;
  505         vfslocked = NDHASGIANT(&nd);
  506         if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
  507                 NDFREE(&nd, NDF_ONLY_PNBUF);
  508                 if (nd.ni_dvp == vp)
  509                         vrele(nd.ni_dvp);
  510                 else
  511                         vput(nd.ni_dvp);
  512                 if (vp != NULL) {
  513                         vrele(vp);
  514                         error = EADDRINUSE;
  515                         goto error;
  516                 }
  517                 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
  518                 if (error)
  519                         goto error;
  520                 VFS_UNLOCK_GIANT(vfslocked);
  521                 goto restart;
  522         }
  523         VATTR_NULL(&vattr);
  524         vattr.va_type = VSOCK;
  525         vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
  526 #ifdef MAC
  527         error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
  528             &vattr);
  529 #endif
  530         if (error == 0)
  531                 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
  532         NDFREE(&nd, NDF_ONLY_PNBUF);
  533         vput(nd.ni_dvp);
  534         if (error) {
  535                 vn_finished_write(mp);
  536                 goto error;
  537         }
  538         vp = nd.ni_vp;
  539         ASSERT_VOP_ELOCKED(vp, "uipc_bind");
  540         soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
  541 
  542         UNP_LINK_WLOCK();
  543         UNP_PCB_LOCK(unp);
  544         vp->v_socket = unp->unp_socket;
  545         unp->unp_vnode = vp;
  546         unp->unp_addr = soun;
  547         unp->unp_flags &= ~UNP_BINDING;
  548         UNP_PCB_UNLOCK(unp);
  549         UNP_LINK_WUNLOCK();
  550         VOP_UNLOCK(vp, 0);
  551         vn_finished_write(mp);
  552         VFS_UNLOCK_GIANT(vfslocked);
  553         free(buf, M_TEMP);
  554         return (0);
  555 
  556 error:
  557         VFS_UNLOCK_GIANT(vfslocked);
  558         UNP_PCB_LOCK(unp);
  559         unp->unp_flags &= ~UNP_BINDING;
  560         UNP_PCB_UNLOCK(unp);
  561         free(buf, M_TEMP);
  562         return (error);
  563 }
  564 
  565 static int
  566 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  567 {
  568         int error;
  569 
  570         KASSERT(td == curthread, ("uipc_connect: td != curthread"));
  571         UNP_LINK_WLOCK();
  572         error = unp_connect(so, nam, td);
  573         UNP_LINK_WUNLOCK();
  574         return (error);
  575 }
  576 
  577 static void
  578 uipc_close(struct socket *so)
  579 {
  580         struct unpcb *unp, *unp2;
  581 
  582         unp = sotounpcb(so);
  583         KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
  584 
  585         UNP_LINK_WLOCK();
  586         UNP_PCB_LOCK(unp);
  587         unp2 = unp->unp_conn;
  588         if (unp2 != NULL) {
  589                 UNP_PCB_LOCK(unp2);
  590                 unp_disconnect(unp, unp2);
  591                 UNP_PCB_UNLOCK(unp2);
  592         }
  593         UNP_PCB_UNLOCK(unp);
  594         UNP_LINK_WUNLOCK();
  595 }
  596 
  597 static int
  598 uipc_connect2(struct socket *so1, struct socket *so2)
  599 {
  600         struct unpcb *unp, *unp2;
  601         int error;
  602 
  603         UNP_LINK_WLOCK();
  604         unp = so1->so_pcb;
  605         KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
  606         UNP_PCB_LOCK(unp);
  607         unp2 = so2->so_pcb;
  608         KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
  609         UNP_PCB_LOCK(unp2);
  610         error = unp_connect2(so1, so2, PRU_CONNECT2);
  611         UNP_PCB_UNLOCK(unp2);
  612         UNP_PCB_UNLOCK(unp);
  613         UNP_LINK_WUNLOCK();
  614         return (error);
  615 }
  616 
  617 static void
  618 uipc_detach(struct socket *so)
  619 {
  620         struct unpcb *unp, *unp2;
  621         struct sockaddr_un *saved_unp_addr;
  622         struct vnode *vp;
  623         int freeunp, local_unp_rights;
  624 
  625         unp = sotounpcb(so);
  626         KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
  627 
  628         UNP_LINK_WLOCK();
  629         UNP_LIST_LOCK();
  630         UNP_PCB_LOCK(unp);
  631         LIST_REMOVE(unp, unp_link);
  632         unp->unp_gencnt = ++unp_gencnt;
  633         --unp_count;
  634         UNP_LIST_UNLOCK();
  635 
  636         /*
  637          * XXXRW: Should assert vp->v_socket == so.
  638          */
  639         if ((vp = unp->unp_vnode) != NULL) {
  640                 unp->unp_vnode->v_socket = NULL;
  641                 unp->unp_vnode = NULL;
  642         }
  643         unp2 = unp->unp_conn;
  644         if (unp2 != NULL) {
  645                 UNP_PCB_LOCK(unp2);
  646                 unp_disconnect(unp, unp2);
  647                 UNP_PCB_UNLOCK(unp2);
  648         }
  649 
  650         /*
  651          * We hold the linkage lock exclusively, so it's OK to acquire
  652          * multiple pcb locks at a time.
  653          */
  654         while (!LIST_EMPTY(&unp->unp_refs)) {
  655                 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
  656 
  657                 UNP_PCB_LOCK(ref);
  658                 unp_drop(ref, ECONNRESET);
  659                 UNP_PCB_UNLOCK(ref);
  660         }
  661         local_unp_rights = unp_rights;
  662         UNP_LINK_WUNLOCK();
  663         unp->unp_socket->so_pcb = NULL;
  664         saved_unp_addr = unp->unp_addr;
  665         unp->unp_addr = NULL;
  666         unp->unp_refcount--;
  667         freeunp = (unp->unp_refcount == 0);
  668         if (saved_unp_addr != NULL)
  669                 free(saved_unp_addr, M_SONAME);
  670         if (freeunp) {
  671                 UNP_PCB_LOCK_DESTROY(unp);
  672                 uma_zfree(unp_zone, unp);
  673         } else
  674                 UNP_PCB_UNLOCK(unp);
  675         if (vp) {
  676                 int vfslocked;
  677 
  678                 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  679                 vrele(vp);
  680                 VFS_UNLOCK_GIANT(vfslocked);
  681         }
  682         if (local_unp_rights)
  683                 taskqueue_enqueue(taskqueue_thread, &unp_gc_task);
  684 }
  685 
  686 static int
  687 uipc_disconnect(struct socket *so)
  688 {
  689         struct unpcb *unp, *unp2;
  690 
  691         unp = sotounpcb(so);
  692         KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
  693 
  694         UNP_LINK_WLOCK();
  695         UNP_PCB_LOCK(unp);
  696         unp2 = unp->unp_conn;
  697         if (unp2 != NULL) {
  698                 UNP_PCB_LOCK(unp2);
  699                 unp_disconnect(unp, unp2);
  700                 UNP_PCB_UNLOCK(unp2);
  701         }
  702         UNP_PCB_UNLOCK(unp);
  703         UNP_LINK_WUNLOCK();
  704         return (0);
  705 }
  706 
  707 static int
  708 uipc_listen(struct socket *so, int backlog, struct thread *td)
  709 {
  710         struct unpcb *unp;
  711         int error;
  712 
  713         unp = sotounpcb(so);
  714         KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
  715 
  716         UNP_PCB_LOCK(unp);
  717         if (unp->unp_vnode == NULL) {
  718                 UNP_PCB_UNLOCK(unp);
  719                 return (EINVAL);
  720         }
  721 
  722         SOCK_LOCK(so);
  723         error = solisten_proto_check(so);
  724         if (error == 0) {
  725                 cru2x(td->td_ucred, &unp->unp_peercred);
  726                 unp->unp_flags |= UNP_HAVEPCCACHED;
  727                 solisten_proto(so, backlog);
  728         }
  729         SOCK_UNLOCK(so);
  730         UNP_PCB_UNLOCK(unp);
  731         return (error);
  732 }
  733 
  734 static int
  735 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
  736 {
  737         struct unpcb *unp, *unp2;
  738         const struct sockaddr *sa;
  739 
  740         unp = sotounpcb(so);
  741         KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
  742 
  743         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
  744         UNP_LINK_RLOCK();
  745         /*
  746          * XXX: It seems that this test always fails even when connection is
  747          * established.  So, this else clause is added as workaround to
  748          * return PF_LOCAL sockaddr.
  749          */
  750         unp2 = unp->unp_conn;
  751         if (unp2 != NULL) {
  752                 UNP_PCB_LOCK(unp2);
  753                 if (unp2->unp_addr != NULL)
  754                         sa = (struct sockaddr *) unp2->unp_addr;
  755                 else
  756                         sa = &sun_noname;
  757                 bcopy(sa, *nam, sa->sa_len);
  758                 UNP_PCB_UNLOCK(unp2);
  759         } else {
  760                 sa = &sun_noname;
  761                 bcopy(sa, *nam, sa->sa_len);
  762         }
  763         UNP_LINK_RUNLOCK();
  764         return (0);
  765 }
  766 
  767 static int
  768 uipc_rcvd(struct socket *so, int flags)
  769 {
  770         struct unpcb *unp, *unp2;
  771         struct socket *so2;
  772         u_int mbcnt, sbcc;
  773         u_long newhiwat;
  774 
  775         unp = sotounpcb(so);
  776         KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
  777 
  778         if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
  779                 panic("uipc_rcvd socktype %d", so->so_type);
  780 
  781         /*
  782          * Adjust backpressure on sender and wakeup any waiting to write.
  783          *
  784          * The unp lock is acquired to maintain the validity of the unp_conn
  785          * pointer; no lock on unp2 is required as unp2->unp_socket will be
  786          * static as long as we don't permit unp2 to disconnect from unp,
  787          * which is prevented by the lock on unp.  We cache values from
  788          * so_rcv to avoid holding the so_rcv lock over the entire
  789          * transaction on the remote so_snd.
  790          */
  791         SOCKBUF_LOCK(&so->so_rcv);
  792         mbcnt = so->so_rcv.sb_mbcnt;
  793         sbcc = so->so_rcv.sb_cc;
  794         SOCKBUF_UNLOCK(&so->so_rcv);
  795         UNP_PCB_LOCK(unp);
  796         unp2 = unp->unp_conn;
  797         if (unp2 == NULL) {
  798                 UNP_PCB_UNLOCK(unp);
  799                 return (0);
  800         }
  801         so2 = unp2->unp_socket;
  802         SOCKBUF_LOCK(&so2->so_snd);
  803         so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
  804         newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
  805         (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
  806             newhiwat, RLIM_INFINITY);
  807         sowwakeup_locked(so2);
  808         unp->unp_mbcnt = mbcnt;
  809         unp->unp_cc = sbcc;
  810         UNP_PCB_UNLOCK(unp);
  811         return (0);
  812 }
  813 
  814 static int
  815 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  816     struct mbuf *control, struct thread *td)
  817 {
  818         struct unpcb *unp, *unp2;
  819         struct socket *so2;
  820         u_int mbcnt_delta, sbcc;
  821         u_int newhiwat;
  822         int error = 0;
  823 
  824         unp = sotounpcb(so);
  825         KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
  826 
  827         if (flags & PRUS_OOB) {
  828                 error = EOPNOTSUPP;
  829                 goto release;
  830         }
  831         if (control != NULL && (error = unp_internalize(&control, td)))
  832                 goto release;
  833         if ((nam != NULL) || (flags & PRUS_EOF))
  834                 UNP_LINK_WLOCK();
  835         else
  836                 UNP_LINK_RLOCK();
  837         switch (so->so_type) {
  838         case SOCK_DGRAM:
  839         {
  840                 const struct sockaddr *from;
  841 
  842                 unp2 = unp->unp_conn;
  843                 if (nam != NULL) {
  844                         UNP_LINK_WLOCK_ASSERT();
  845                         if (unp2 != NULL) {
  846                                 error = EISCONN;
  847                                 break;
  848                         }
  849                         error = unp_connect(so, nam, td);
  850                         if (error)
  851                                 break;
  852                         unp2 = unp->unp_conn;
  853                 }
  854 
  855                 /*
  856                  * Because connect() and send() are non-atomic in a sendto()
  857                  * with a target address, it's possible that the socket will
  858                  * have disconnected before the send() can run.  In that case
  859                  * return the slightly counter-intuitive but otherwise
  860                  * correct error that the socket is not connected.
  861                  */
  862                 if (unp2 == NULL) {
  863                         error = ENOTCONN;
  864                         break;
  865                 }
  866                 /* Lockless read. */
  867                 if (unp2->unp_flags & UNP_WANTCRED)
  868                         control = unp_addsockcred(td, control);
  869                 UNP_PCB_LOCK(unp);
  870                 if (unp->unp_addr != NULL)
  871                         from = (struct sockaddr *)unp->unp_addr;
  872                 else
  873                         from = &sun_noname;
  874                 so2 = unp2->unp_socket;
  875                 SOCKBUF_LOCK(&so2->so_rcv);
  876                 if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
  877                         sorwakeup_locked(so2);
  878                         m = NULL;
  879                         control = NULL;
  880                 } else {
  881                         SOCKBUF_UNLOCK(&so2->so_rcv);
  882                         error = ENOBUFS;
  883                 }
  884                 if (nam != NULL) {
  885                         UNP_LINK_WLOCK_ASSERT();
  886                         UNP_PCB_LOCK(unp2);
  887                         unp_disconnect(unp, unp2);
  888                         UNP_PCB_UNLOCK(unp2);
  889                 }
  890                 UNP_PCB_UNLOCK(unp);
  891                 break;
  892         }
  893 
  894         case SOCK_SEQPACKET:
  895         case SOCK_STREAM:
  896                 if ((so->so_state & SS_ISCONNECTED) == 0) {
  897                         if (nam != NULL) {
  898                                 UNP_LINK_WLOCK_ASSERT();
  899                                 error = unp_connect(so, nam, td);
  900                                 if (error)
  901                                         break;  /* XXX */
  902                         } else {
  903                                 error = ENOTCONN;
  904                                 break;
  905                         }
  906                 }
  907 
  908                 /* Lockless read. */
  909                 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
  910                         error = EPIPE;
  911                         break;
  912                 }
  913 
  914                 /*
  915                  * Because connect() and send() are non-atomic in a sendto()
  916                  * with a target address, it's possible that the socket will
  917                  * have disconnected before the send() can run.  In that case
  918                  * return the slightly counter-intuitive but otherwise
  919                  * correct error that the socket is not connected.
  920                  *
  921                  * Locking here must be done carefully: the linkage lock
  922                  * prevents interconnections between unpcbs from changing, so
  923                  * we can traverse from unp to unp2 without acquiring unp's
  924                  * lock.  Socket buffer locks follow unpcb locks, so we can
  925                  * acquire both remote and lock socket buffer locks.
  926                  */
  927                 unp2 = unp->unp_conn;
  928                 if (unp2 == NULL) {
  929                         error = ENOTCONN;
  930                         break;
  931                 }
  932                 so2 = unp2->unp_socket;
  933                 UNP_PCB_LOCK(unp2);
  934                 SOCKBUF_LOCK(&so2->so_rcv);
  935                 if (unp2->unp_flags & UNP_WANTCRED) {
  936                         /*
  937                          * Credentials are passed only once on SOCK_STREAM.
  938                          */
  939                         unp2->unp_flags &= ~UNP_WANTCRED;
  940                         control = unp_addsockcred(td, control);
  941                 }
  942                 /*
  943                  * Send to paired receive port, and then reduce send buffer
  944                  * hiwater marks to maintain backpressure.  Wake up readers.
  945                  */
  946                 switch (so->so_type) {
  947                 case SOCK_STREAM:
  948                         if (control != NULL) {
  949                                 if (sbappendcontrol_locked(&so2->so_rcv, m,
  950                                     control))
  951                                         control = NULL;
  952                         } else
  953                                 sbappend_locked(&so2->so_rcv, m);
  954                         break;
  955 
  956                 case SOCK_SEQPACKET: {
  957                         const struct sockaddr *from;
  958 
  959                         from = &sun_noname;
  960                         if (sbappendaddr_locked(&so2->so_rcv, from, m,
  961                             control))
  962                                 control = NULL;
  963                         break;
  964                         }
  965                 }
  966 
  967                 /*
  968                  * XXXRW: While fine for SOCK_STREAM, this conflates maximum
  969                  * datagram size and back-pressure for SOCK_SEQPACKET, which
  970                  * can lead to undesired return of EMSGSIZE on send instead
  971                  * of more desirable blocking.
  972                  */
  973                 mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
  974                 unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
  975                 sbcc = so2->so_rcv.sb_cc;
  976                 sorwakeup_locked(so2);
  977 
  978                 SOCKBUF_LOCK(&so->so_snd);
  979                 if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
  980                         newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
  981                 else
  982                         newhiwat = 0;
  983                 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
  984                     newhiwat, RLIM_INFINITY);
  985                 so->so_snd.sb_mbmax -= mbcnt_delta;
  986                 SOCKBUF_UNLOCK(&so->so_snd);
  987                 unp2->unp_cc = sbcc;
  988                 UNP_PCB_UNLOCK(unp2);
  989                 m = NULL;
  990                 break;
  991 
  992         default:
  993                 panic("uipc_send unknown socktype");
  994         }
  995 
  996         /*
  997          * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
  998          */
  999         if (flags & PRUS_EOF) {
 1000                 UNP_PCB_LOCK(unp);
 1001                 socantsendmore(so);
 1002                 unp_shutdown(unp);
 1003                 UNP_PCB_UNLOCK(unp);
 1004         }
 1005 
 1006         if ((nam != NULL) || (flags & PRUS_EOF))
 1007                 UNP_LINK_WUNLOCK();
 1008         else
 1009                 UNP_LINK_RUNLOCK();
 1010 
 1011         if (control != NULL && error != 0)
 1012                 unp_dispose(control);
 1013 
 1014 release:
 1015         if (control != NULL)
 1016                 m_freem(control);
 1017         if (m != NULL)
 1018                 m_freem(m);
 1019         return (error);
 1020 }
 1021 
 1022 static int
 1023 uipc_sense(struct socket *so, struct stat *sb)
 1024 {
 1025         struct unpcb *unp, *unp2;
 1026         struct socket *so2;
 1027 
 1028         unp = sotounpcb(so);
 1029         KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
 1030 
 1031         sb->st_blksize = so->so_snd.sb_hiwat;
 1032         UNP_LINK_RLOCK();
 1033         UNP_PCB_LOCK(unp);
 1034         unp2 = unp->unp_conn;
 1035         if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
 1036             unp2 != NULL) {
 1037                 so2 = unp2->unp_socket;
 1038                 sb->st_blksize += so2->so_rcv.sb_cc;
 1039         }
 1040         sb->st_dev = NODEV;
 1041         if (unp->unp_ino == 0)
 1042                 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
 1043         sb->st_ino = unp->unp_ino;
 1044         UNP_PCB_UNLOCK(unp);
 1045         UNP_LINK_RUNLOCK();
 1046         return (0);
 1047 }
 1048 
 1049 static int
 1050 uipc_shutdown(struct socket *so)
 1051 {
 1052         struct unpcb *unp;
 1053 
 1054         unp = sotounpcb(so);
 1055         KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
 1056 
 1057         UNP_LINK_WLOCK();
 1058         UNP_PCB_LOCK(unp);
 1059         socantsendmore(so);
 1060         unp_shutdown(unp);
 1061         UNP_PCB_UNLOCK(unp);
 1062         UNP_LINK_WUNLOCK();
 1063         return (0);
 1064 }
 1065 
 1066 static int
 1067 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
 1068 {
 1069         struct unpcb *unp;
 1070         const struct sockaddr *sa;
 1071 
 1072         unp = sotounpcb(so);
 1073         KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
 1074 
 1075         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 1076         UNP_PCB_LOCK(unp);
 1077         if (unp->unp_addr != NULL)
 1078                 sa = (struct sockaddr *) unp->unp_addr;
 1079         else
 1080                 sa = &sun_noname;
 1081         bcopy(sa, *nam, sa->sa_len);
 1082         UNP_PCB_UNLOCK(unp);
 1083         return (0);
 1084 }
 1085 
 1086 static struct pr_usrreqs uipc_usrreqs_dgram = {
 1087         .pru_abort =            uipc_abort,
 1088         .pru_accept =           uipc_accept,
 1089         .pru_attach =           uipc_attach,
 1090         .pru_bind =             uipc_bind,
 1091         .pru_connect =          uipc_connect,
 1092         .pru_connect2 =         uipc_connect2,
 1093         .pru_detach =           uipc_detach,
 1094         .pru_disconnect =       uipc_disconnect,
 1095         .pru_listen =           uipc_listen,
 1096         .pru_peeraddr =         uipc_peeraddr,
 1097         .pru_rcvd =             uipc_rcvd,
 1098         .pru_send =             uipc_send,
 1099         .pru_sense =            uipc_sense,
 1100         .pru_shutdown =         uipc_shutdown,
 1101         .pru_sockaddr =         uipc_sockaddr,
 1102         .pru_soreceive =        soreceive_dgram,
 1103         .pru_close =            uipc_close,
 1104 };
 1105 
 1106 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
 1107         .pru_abort =            uipc_abort,
 1108         .pru_accept =           uipc_accept,
 1109         .pru_attach =           uipc_attach,
 1110         .pru_bind =             uipc_bind,
 1111         .pru_connect =          uipc_connect,
 1112         .pru_connect2 =         uipc_connect2,
 1113         .pru_detach =           uipc_detach,
 1114         .pru_disconnect =       uipc_disconnect,
 1115         .pru_listen =           uipc_listen,
 1116         .pru_peeraddr =         uipc_peeraddr,
 1117         .pru_rcvd =             uipc_rcvd,
 1118         .pru_send =             uipc_send,
 1119         .pru_sense =            uipc_sense,
 1120         .pru_shutdown =         uipc_shutdown,
 1121         .pru_sockaddr =         uipc_sockaddr,
 1122         .pru_soreceive =        soreceive_generic,      /* XXX: or...? */
 1123         .pru_close =            uipc_close,
 1124 };
 1125 
 1126 static struct pr_usrreqs uipc_usrreqs_stream = {
 1127         .pru_abort =            uipc_abort,
 1128         .pru_accept =           uipc_accept,
 1129         .pru_attach =           uipc_attach,
 1130         .pru_bind =             uipc_bind,
 1131         .pru_connect =          uipc_connect,
 1132         .pru_connect2 =         uipc_connect2,
 1133         .pru_detach =           uipc_detach,
 1134         .pru_disconnect =       uipc_disconnect,
 1135         .pru_listen =           uipc_listen,
 1136         .pru_peeraddr =         uipc_peeraddr,
 1137         .pru_rcvd =             uipc_rcvd,
 1138         .pru_send =             uipc_send,
 1139         .pru_sense =            uipc_sense,
 1140         .pru_shutdown =         uipc_shutdown,
 1141         .pru_sockaddr =         uipc_sockaddr,
 1142         .pru_soreceive =        soreceive_generic,
 1143         .pru_close =            uipc_close,
 1144 };
 1145 
 1146 static int
 1147 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
 1148 {
 1149         struct unpcb *unp;
 1150         struct xucred xu;
 1151         int error, optval;
 1152 
 1153         if (sopt->sopt_level != 0)
 1154                 return (EINVAL);
 1155 
 1156         unp = sotounpcb(so);
 1157         KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
 1158         error = 0;
 1159         switch (sopt->sopt_dir) {
 1160         case SOPT_GET:
 1161                 switch (sopt->sopt_name) {
 1162                 case LOCAL_PEERCRED:
 1163                         UNP_PCB_LOCK(unp);
 1164                         if (unp->unp_flags & UNP_HAVEPC)
 1165                                 xu = unp->unp_peercred;
 1166                         else {
 1167                                 if (so->so_type == SOCK_STREAM)
 1168                                         error = ENOTCONN;
 1169                                 else
 1170                                         error = EINVAL;
 1171                         }
 1172                         UNP_PCB_UNLOCK(unp);
 1173                         if (error == 0)
 1174                                 error = sooptcopyout(sopt, &xu, sizeof(xu));
 1175                         break;
 1176 
 1177                 case LOCAL_CREDS:
 1178                         /* Unlocked read. */
 1179                         optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
 1180                         error = sooptcopyout(sopt, &optval, sizeof(optval));
 1181                         break;
 1182 
 1183                 case LOCAL_CONNWAIT:
 1184                         /* Unlocked read. */
 1185                         optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
 1186                         error = sooptcopyout(sopt, &optval, sizeof(optval));
 1187                         break;
 1188 
 1189                 default:
 1190                         error = EOPNOTSUPP;
 1191                         break;
 1192                 }
 1193                 break;
 1194 
 1195         case SOPT_SET:
 1196                 switch (sopt->sopt_name) {
 1197                 case LOCAL_CREDS:
 1198                 case LOCAL_CONNWAIT:
 1199                         error = sooptcopyin(sopt, &optval, sizeof(optval),
 1200                                             sizeof(optval));
 1201                         if (error)
 1202                                 break;
 1203 
 1204 #define OPTSET(bit) do {                                                \
 1205         UNP_PCB_LOCK(unp);                                              \
 1206         if (optval)                                                     \
 1207                 unp->unp_flags |= bit;                                  \
 1208         else                                                            \
 1209                 unp->unp_flags &= ~bit;                                 \
 1210         UNP_PCB_UNLOCK(unp);                                            \
 1211 } while (0)
 1212 
 1213                         switch (sopt->sopt_name) {
 1214                         case LOCAL_CREDS:
 1215                                 OPTSET(UNP_WANTCRED);
 1216                                 break;
 1217 
 1218                         case LOCAL_CONNWAIT:
 1219                                 OPTSET(UNP_CONNWAIT);
 1220                                 break;
 1221 
 1222                         default:
 1223                                 break;
 1224                         }
 1225                         break;
 1226 #undef  OPTSET
 1227                 default:
 1228                         error = ENOPROTOOPT;
 1229                         break;
 1230                 }
 1231                 break;
 1232 
 1233         default:
 1234                 error = EOPNOTSUPP;
 1235                 break;
 1236         }
 1237         return (error);
 1238 }
 1239 
 1240 static int
 1241 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 1242 {
 1243         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
 1244         struct vnode *vp;
 1245         struct socket *so2, *so3;
 1246         struct unpcb *unp, *unp2, *unp3;
 1247         int error, len, vfslocked;
 1248         struct nameidata nd;
 1249         char buf[SOCK_MAXADDRLEN];
 1250         struct sockaddr *sa;
 1251 
 1252         UNP_LINK_WLOCK_ASSERT();
 1253 
 1254         unp = sotounpcb(so);
 1255         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
 1256 
 1257         if (nam->sa_len > sizeof(struct sockaddr_un))
 1258                 return (EINVAL);
 1259         len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
 1260         if (len <= 0)
 1261                 return (EINVAL);
 1262         bcopy(soun->sun_path, buf, len);
 1263         buf[len] = 0;
 1264 
 1265         UNP_PCB_LOCK(unp);
 1266         if (unp->unp_flags & UNP_CONNECTING) {
 1267                 UNP_PCB_UNLOCK(unp);
 1268                 return (EALREADY);
 1269         }
 1270         UNP_LINK_WUNLOCK();
 1271         unp->unp_flags |= UNP_CONNECTING;
 1272         UNP_PCB_UNLOCK(unp);
 1273 
 1274         sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 1275         NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf,
 1276             td);
 1277         error = namei(&nd);
 1278         if (error)
 1279                 vp = NULL;
 1280         else
 1281                 vp = nd.ni_vp;
 1282         ASSERT_VOP_LOCKED(vp, "unp_connect");
 1283         vfslocked = NDHASGIANT(&nd);
 1284         NDFREE(&nd, NDF_ONLY_PNBUF);
 1285         if (error)
 1286                 goto bad;
 1287 
 1288         if (vp->v_type != VSOCK) {
 1289                 error = ENOTSOCK;
 1290                 goto bad;
 1291         }
 1292 #ifdef MAC
 1293         error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
 1294         if (error)
 1295                 goto bad;
 1296 #endif
 1297         error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
 1298         if (error)
 1299                 goto bad;
 1300         VFS_UNLOCK_GIANT(vfslocked);
 1301 
 1302         unp = sotounpcb(so);
 1303         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
 1304 
 1305         /*
 1306          * Lock linkage lock for two reasons: make sure v_socket is stable,
 1307          * and to protect simultaneous locking of multiple pcbs.
 1308          */
 1309         UNP_LINK_WLOCK();
 1310         so2 = vp->v_socket;
 1311         if (so2 == NULL) {
 1312                 error = ECONNREFUSED;
 1313                 goto bad2;
 1314         }
 1315         if (so->so_type != so2->so_type) {
 1316                 error = EPROTOTYPE;
 1317                 goto bad2;
 1318         }
 1319         if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
 1320                 if (so2->so_options & SO_ACCEPTCONN) {
 1321                         CURVNET_SET(so2->so_vnet);
 1322                         so3 = sonewconn(so2, 0);
 1323                         CURVNET_RESTORE();
 1324                 } else
 1325                         so3 = NULL;
 1326                 if (so3 == NULL) {
 1327                         error = ECONNREFUSED;
 1328                         goto bad2;
 1329                 }
 1330                 unp = sotounpcb(so);
 1331                 unp2 = sotounpcb(so2);
 1332                 unp3 = sotounpcb(so3);
 1333                 UNP_PCB_LOCK(unp);
 1334                 UNP_PCB_LOCK(unp2);
 1335                 UNP_PCB_LOCK(unp3);
 1336                 if (unp2->unp_addr != NULL) {
 1337                         bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
 1338                         unp3->unp_addr = (struct sockaddr_un *) sa;
 1339                         sa = NULL;
 1340                 }
 1341 
 1342                 /*
 1343                  * The connecter's (client's) credentials are copied from its
 1344                  * process structure at the time of connect() (which is now).
 1345                  */
 1346                 cru2x(td->td_ucred, &unp3->unp_peercred);
 1347                 unp3->unp_flags |= UNP_HAVEPC;
 1348 
 1349                 /*
 1350                  * The receiver's (server's) credentials are copied from the
 1351                  * unp_peercred member of socket on which the former called
 1352                  * listen(); uipc_listen() cached that process's credentials
 1353                  * at that time so we can use them now.
 1354                  */
 1355                 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
 1356                     ("unp_connect: listener without cached peercred"));
 1357                 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
 1358                     sizeof(unp->unp_peercred));
 1359                 unp->unp_flags |= UNP_HAVEPC;
 1360                 if (unp2->unp_flags & UNP_WANTCRED)
 1361                         unp3->unp_flags |= UNP_WANTCRED;
 1362                 UNP_PCB_UNLOCK(unp3);
 1363                 UNP_PCB_UNLOCK(unp2);
 1364                 UNP_PCB_UNLOCK(unp);
 1365 #ifdef MAC
 1366                 mac_socketpeer_set_from_socket(so, so3);
 1367                 mac_socketpeer_set_from_socket(so3, so);
 1368 #endif
 1369 
 1370                 so2 = so3;
 1371         }
 1372         unp = sotounpcb(so);
 1373         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
 1374         unp2 = sotounpcb(so2);
 1375         KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
 1376         UNP_PCB_LOCK(unp);
 1377         UNP_PCB_LOCK(unp2);
 1378         error = unp_connect2(so, so2, PRU_CONNECT);
 1379         UNP_PCB_UNLOCK(unp2);
 1380         UNP_PCB_UNLOCK(unp);
 1381 bad2:
 1382         UNP_LINK_WUNLOCK();
 1383         if (vfslocked)
 1384                 /* 
 1385                  * Giant has been previously acquired. This means filesystem
 1386                  * isn't MPSAFE.  Do it once again.
 1387                  */
 1388                 mtx_lock(&Giant);
 1389 bad:
 1390         if (vp != NULL)
 1391                 vput(vp);
 1392         VFS_UNLOCK_GIANT(vfslocked);
 1393         free(sa, M_SONAME);
 1394         UNP_LINK_WLOCK();
 1395         UNP_PCB_LOCK(unp);
 1396         unp->unp_flags &= ~UNP_CONNECTING;
 1397         UNP_PCB_UNLOCK(unp);
 1398         return (error);
 1399 }
 1400 
 1401 static int
 1402 unp_connect2(struct socket *so, struct socket *so2, int req)
 1403 {
 1404         struct unpcb *unp;
 1405         struct unpcb *unp2;
 1406 
 1407         unp = sotounpcb(so);
 1408         KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
 1409         unp2 = sotounpcb(so2);
 1410         KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
 1411 
 1412         UNP_LINK_WLOCK_ASSERT();
 1413         UNP_PCB_LOCK_ASSERT(unp);
 1414         UNP_PCB_LOCK_ASSERT(unp2);
 1415 
 1416         if (so2->so_type != so->so_type)
 1417                 return (EPROTOTYPE);
 1418         unp->unp_conn = unp2;
 1419 
 1420         switch (so->so_type) {
 1421         case SOCK_DGRAM:
 1422                 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
 1423                 soisconnected(so);
 1424                 break;
 1425 
 1426         case SOCK_STREAM:
 1427         case SOCK_SEQPACKET:
 1428                 unp2->unp_conn = unp;
 1429                 if (req == PRU_CONNECT &&
 1430                     ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
 1431                         soisconnecting(so);
 1432                 else
 1433                         soisconnected(so);
 1434                 soisconnected(so2);
 1435                 break;
 1436 
 1437         default:
 1438                 panic("unp_connect2");
 1439         }
 1440         return (0);
 1441 }
 1442 
 1443 static void
 1444 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
 1445 {
 1446         struct socket *so;
 1447 
 1448         KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
 1449 
 1450         UNP_LINK_WLOCK_ASSERT();
 1451         UNP_PCB_LOCK_ASSERT(unp);
 1452         UNP_PCB_LOCK_ASSERT(unp2);
 1453 
 1454         unp->unp_conn = NULL;
 1455         switch (unp->unp_socket->so_type) {
 1456         case SOCK_DGRAM:
 1457                 LIST_REMOVE(unp, unp_reflink);
 1458                 so = unp->unp_socket;
 1459                 SOCK_LOCK(so);
 1460                 so->so_state &= ~SS_ISCONNECTED;
 1461                 SOCK_UNLOCK(so);
 1462                 break;
 1463 
 1464         case SOCK_STREAM:
 1465         case SOCK_SEQPACKET:
 1466                 soisdisconnected(unp->unp_socket);
 1467                 unp2->unp_conn = NULL;
 1468                 soisdisconnected(unp2->unp_socket);
 1469                 break;
 1470         }
 1471 }
 1472 
 1473 /*
 1474  * unp_pcblist() walks the global list of struct unpcb's to generate a
 1475  * pointer list, bumping the refcount on each unpcb.  It then copies them out
 1476  * sequentially, validating the generation number on each to see if it has
 1477  * been detached.  All of this is necessary because copyout() may sleep on
 1478  * disk I/O.
 1479  */
 1480 static int
 1481 unp_pcblist(SYSCTL_HANDLER_ARGS)
 1482 {
 1483         int error, i, n;
 1484         int freeunp;
 1485         struct unpcb *unp, **unp_list;
 1486         unp_gen_t gencnt;
 1487         struct xunpgen *xug;
 1488         struct unp_head *head;
 1489         struct xunpcb *xu;
 1490 
 1491         switch ((intptr_t)arg1) {
 1492         case SOCK_STREAM:
 1493                 head = &unp_shead;
 1494                 break;
 1495 
 1496         case SOCK_DGRAM:
 1497                 head = &unp_dhead;
 1498                 break;
 1499 
 1500         case SOCK_SEQPACKET:
 1501                 head = &unp_sphead;
 1502                 break;
 1503 
 1504         default:
 1505                 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
 1506         }
 1507 
 1508         /*
 1509          * The process of preparing the PCB list is too time-consuming and
 1510          * resource-intensive to repeat twice on every request.
 1511          */
 1512         if (req->oldptr == NULL) {
 1513                 n = unp_count;
 1514                 req->oldidx = 2 * (sizeof *xug)
 1515                         + (n + n/8) * sizeof(struct xunpcb);
 1516                 return (0);
 1517         }
 1518 
 1519         if (req->newptr != NULL)
 1520                 return (EPERM);
 1521 
 1522         /*
 1523          * OK, now we're committed to doing something.
 1524          */
 1525         xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
 1526         UNP_LIST_LOCK();
 1527         gencnt = unp_gencnt;
 1528         n = unp_count;
 1529         UNP_LIST_UNLOCK();
 1530 
 1531         xug->xug_len = sizeof *xug;
 1532         xug->xug_count = n;
 1533         xug->xug_gen = gencnt;
 1534         xug->xug_sogen = so_gencnt;
 1535         error = SYSCTL_OUT(req, xug, sizeof *xug);
 1536         if (error) {
 1537                 free(xug, M_TEMP);
 1538                 return (error);
 1539         }
 1540 
 1541         unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
 1542 
 1543         UNP_LIST_LOCK();
 1544         for (unp = LIST_FIRST(head), i = 0; unp && i < n;
 1545              unp = LIST_NEXT(unp, unp_link)) {
 1546                 UNP_PCB_LOCK(unp);
 1547                 if (unp->unp_gencnt <= gencnt) {
 1548                         if (cr_cansee(req->td->td_ucred,
 1549                             unp->unp_socket->so_cred)) {
 1550                                 UNP_PCB_UNLOCK(unp);
 1551                                 continue;
 1552                         }
 1553                         unp_list[i++] = unp;
 1554                         unp->unp_refcount++;
 1555                 }
 1556                 UNP_PCB_UNLOCK(unp);
 1557         }
 1558         UNP_LIST_UNLOCK();
 1559         n = i;                  /* In case we lost some during malloc. */
 1560 
 1561         error = 0;
 1562         xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
 1563         for (i = 0; i < n; i++) {
 1564                 unp = unp_list[i];
 1565                 UNP_PCB_LOCK(unp);
 1566                 unp->unp_refcount--;
 1567                 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
 1568                         xu->xu_len = sizeof *xu;
 1569                         xu->xu_unpp = unp;
 1570                         /*
 1571                          * XXX - need more locking here to protect against
 1572                          * connect/disconnect races for SMP.
 1573                          */
 1574                         if (unp->unp_addr != NULL)
 1575                                 bcopy(unp->unp_addr, &xu->xu_addr,
 1576                                       unp->unp_addr->sun_len);
 1577                         if (unp->unp_conn != NULL &&
 1578                             unp->unp_conn->unp_addr != NULL)
 1579                                 bcopy(unp->unp_conn->unp_addr,
 1580                                       &xu->xu_caddr,
 1581                                       unp->unp_conn->unp_addr->sun_len);
 1582                         bcopy(unp, &xu->xu_unp, sizeof *unp);
 1583                         sotoxsocket(unp->unp_socket, &xu->xu_socket);
 1584                         UNP_PCB_UNLOCK(unp);
 1585                         error = SYSCTL_OUT(req, xu, sizeof *xu);
 1586                 } else {
 1587                         freeunp = (unp->unp_refcount == 0);
 1588                         UNP_PCB_UNLOCK(unp);
 1589                         if (freeunp) {
 1590                                 UNP_PCB_LOCK_DESTROY(unp);
 1591                                 uma_zfree(unp_zone, unp);
 1592                         }
 1593                 }
 1594         }
 1595         free(xu, M_TEMP);
 1596         if (!error) {
 1597                 /*
 1598                  * Give the user an updated idea of our state.  If the
 1599                  * generation differs from what we told her before, she knows
 1600                  * that something happened while we were processing this
 1601                  * request, and it might be necessary to retry.
 1602                  */
 1603                 xug->xug_gen = unp_gencnt;
 1604                 xug->xug_sogen = so_gencnt;
 1605                 xug->xug_count = unp_count;
 1606                 error = SYSCTL_OUT(req, xug, sizeof *xug);
 1607         }
 1608         free(unp_list, M_TEMP);
 1609         free(xug, M_TEMP);
 1610         return (error);
 1611 }
 1612 
 1613 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
 1614     (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
 1615     "List of active local datagram sockets");
 1616 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
 1617     (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
 1618     "List of active local stream sockets");
 1619 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
 1620     CTLTYPE_OPAQUE | CTLFLAG_RD,
 1621     (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
 1622     "List of active local seqpacket sockets");
 1623 
 1624 static void
 1625 unp_shutdown(struct unpcb *unp)
 1626 {
 1627         struct unpcb *unp2;
 1628         struct socket *so;
 1629 
 1630         UNP_LINK_WLOCK_ASSERT();
 1631         UNP_PCB_LOCK_ASSERT(unp);
 1632 
 1633         unp2 = unp->unp_conn;
 1634         if ((unp->unp_socket->so_type == SOCK_STREAM ||
 1635             (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
 1636                 so = unp2->unp_socket;
 1637                 if (so != NULL)
 1638                         socantrcvmore(so);
 1639         }
 1640 }
 1641 
 1642 static void
 1643 unp_drop(struct unpcb *unp, int errno)
 1644 {
 1645         struct socket *so = unp->unp_socket;
 1646         struct unpcb *unp2;
 1647 
 1648         UNP_LINK_WLOCK_ASSERT();
 1649         UNP_PCB_LOCK_ASSERT(unp);
 1650 
 1651         so->so_error = errno;
 1652         unp2 = unp->unp_conn;
 1653         if (unp2 == NULL)
 1654                 return;
 1655         UNP_PCB_LOCK(unp2);
 1656         unp_disconnect(unp, unp2);
 1657         UNP_PCB_UNLOCK(unp2);
 1658 }
 1659 
 1660 static void
 1661 unp_freerights(struct file **rp, int fdcount)
 1662 {
 1663         int i;
 1664         struct file *fp;
 1665 
 1666         for (i = 0; i < fdcount; i++) {
 1667                 fp = *rp;
 1668                 *rp++ = NULL;
 1669                 unp_discard(fp);
 1670         }
 1671 }
 1672 
 1673 static int
 1674 unp_externalize(struct mbuf *control, struct mbuf **controlp)
 1675 {
 1676         struct thread *td = curthread;          /* XXX */
 1677         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
 1678         int i;
 1679         int *fdp;
 1680         struct file **rp;
 1681         struct file *fp;
 1682         void *data;
 1683         socklen_t clen = control->m_len, datalen;
 1684         int error, newfds;
 1685         int f;
 1686         u_int newlen;
 1687 
 1688         UNP_LINK_UNLOCK_ASSERT();
 1689 
 1690         error = 0;
 1691         if (controlp != NULL) /* controlp == NULL => free control messages */
 1692                 *controlp = NULL;
 1693         while (cm != NULL) {
 1694                 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
 1695                         error = EINVAL;
 1696                         break;
 1697                 }
 1698                 data = CMSG_DATA(cm);
 1699                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1700                 if (cm->cmsg_level == SOL_SOCKET
 1701                     && cm->cmsg_type == SCM_RIGHTS) {
 1702                         newfds = datalen / sizeof(struct file *);
 1703                         rp = data;
 1704 
 1705                         /* If we're not outputting the descriptors free them. */
 1706                         if (error || controlp == NULL) {
 1707                                 unp_freerights(rp, newfds);
 1708                                 goto next;
 1709                         }
 1710                         FILEDESC_XLOCK(td->td_proc->p_fd);
 1711                         /* if the new FD's will not fit free them.  */
 1712                         if (!fdavail(td, newfds)) {
 1713                                 FILEDESC_XUNLOCK(td->td_proc->p_fd);
 1714                                 error = EMSGSIZE;
 1715                                 unp_freerights(rp, newfds);
 1716                                 goto next;
 1717                         }
 1718 
 1719                         /*
 1720                          * Now change each pointer to an fd in the global
 1721                          * table to an integer that is the index to the local
 1722                          * fd table entry that we set up to point to the
 1723                          * global one we are transferring.
 1724                          */
 1725                         newlen = newfds * sizeof(int);
 1726                         *controlp = sbcreatecontrol(NULL, newlen,
 1727                             SCM_RIGHTS, SOL_SOCKET);
 1728                         if (*controlp == NULL) {
 1729                                 FILEDESC_XUNLOCK(td->td_proc->p_fd);
 1730                                 error = E2BIG;
 1731                                 unp_freerights(rp, newfds);
 1732                                 goto next;
 1733                         }
 1734 
 1735                         fdp = (int *)
 1736                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
 1737                         for (i = 0; i < newfds; i++) {
 1738                                 if (fdalloc(td, 0, &f))
 1739                                         panic("unp_externalize fdalloc failed");
 1740                                 fp = *rp++;
 1741                                 td->td_proc->p_fd->fd_ofiles[f] = fp;
 1742                                 unp_externalize_fp(fp);
 1743                                 *fdp++ = f;
 1744                         }
 1745                         FILEDESC_XUNLOCK(td->td_proc->p_fd);
 1746                 } else {
 1747                         /* We can just copy anything else across. */
 1748                         if (error || controlp == NULL)
 1749                                 goto next;
 1750                         *controlp = sbcreatecontrol(NULL, datalen,
 1751                             cm->cmsg_type, cm->cmsg_level);
 1752                         if (*controlp == NULL) {
 1753                                 error = ENOBUFS;
 1754                                 goto next;
 1755                         }
 1756                         bcopy(data,
 1757                             CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
 1758                             datalen);
 1759                 }
 1760                 controlp = &(*controlp)->m_next;
 1761 
 1762 next:
 1763                 if (CMSG_SPACE(datalen) < clen) {
 1764                         clen -= CMSG_SPACE(datalen);
 1765                         cm = (struct cmsghdr *)
 1766                             ((caddr_t)cm + CMSG_SPACE(datalen));
 1767                 } else {
 1768                         clen = 0;
 1769                         cm = NULL;
 1770                 }
 1771         }
 1772 
 1773         m_freem(control);
 1774         return (error);
 1775 }
 1776 
 1777 static void
 1778 unp_zone_change(void *tag)
 1779 {
 1780 
 1781         uma_zone_set_max(unp_zone, maxsockets);
 1782 }
 1783 
 1784 static void
 1785 unp_init(void)
 1786 {
 1787 
 1788 #ifdef VIMAGE
 1789         if (!IS_DEFAULT_VNET(curvnet))
 1790                 return;
 1791 #endif
 1792         unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
 1793             NULL, NULL, UMA_ALIGN_PTR, 0);
 1794         if (unp_zone == NULL)
 1795                 panic("unp_init");
 1796         uma_zone_set_max(unp_zone, maxsockets);
 1797         EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
 1798             NULL, EVENTHANDLER_PRI_ANY);
 1799         LIST_INIT(&unp_dhead);
 1800         LIST_INIT(&unp_shead);
 1801         LIST_INIT(&unp_sphead);
 1802         SLIST_INIT(&unp_defers);
 1803         TASK_INIT(&unp_gc_task, 0, unp_gc, NULL);
 1804         TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
 1805         UNP_LINK_LOCK_INIT();
 1806         UNP_LIST_LOCK_INIT();
 1807         UNP_DEFERRED_LOCK_INIT();
 1808 }
 1809 
 1810 static int
 1811 unp_internalize(struct mbuf **controlp, struct thread *td)
 1812 {
 1813         struct mbuf *control = *controlp;
 1814         struct proc *p = td->td_proc;
 1815         struct filedesc *fdescp = p->p_fd;
 1816         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
 1817         struct cmsgcred *cmcred;
 1818         struct file **rp;
 1819         struct file *fp;
 1820         struct timeval *tv;
 1821         int i, fd, *fdp;
 1822         void *data;
 1823         socklen_t clen = control->m_len, datalen;
 1824         int error, oldfds;
 1825         u_int newlen;
 1826 
 1827         UNP_LINK_UNLOCK_ASSERT();
 1828 
 1829         error = 0;
 1830         *controlp = NULL;
 1831         while (cm != NULL) {
 1832                 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
 1833                     || cm->cmsg_len > clen) {
 1834                         error = EINVAL;
 1835                         goto out;
 1836                 }
 1837                 data = CMSG_DATA(cm);
 1838                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1839 
 1840                 switch (cm->cmsg_type) {
 1841                 /*
 1842                  * Fill in credential information.
 1843                  */
 1844                 case SCM_CREDS:
 1845                         *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
 1846                             SCM_CREDS, SOL_SOCKET);
 1847                         if (*controlp == NULL) {
 1848                                 error = ENOBUFS;
 1849                                 goto out;
 1850                         }
 1851                         cmcred = (struct cmsgcred *)
 1852                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
 1853                         cmcred->cmcred_pid = p->p_pid;
 1854                         cmcred->cmcred_uid = td->td_ucred->cr_ruid;
 1855                         cmcred->cmcred_gid = td->td_ucred->cr_rgid;
 1856                         cmcred->cmcred_euid = td->td_ucred->cr_uid;
 1857                         cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
 1858                             CMGROUP_MAX);
 1859                         for (i = 0; i < cmcred->cmcred_ngroups; i++)
 1860                                 cmcred->cmcred_groups[i] =
 1861                                     td->td_ucred->cr_groups[i];
 1862                         break;
 1863 
 1864                 case SCM_RIGHTS:
 1865                         oldfds = datalen / sizeof (int);
 1866                         /*
 1867                          * Check that all the FDs passed in refer to legal
 1868                          * files.  If not, reject the entire operation.
 1869                          */
 1870                         fdp = data;
 1871                         FILEDESC_SLOCK(fdescp);
 1872                         for (i = 0; i < oldfds; i++) {
 1873                                 fd = *fdp++;
 1874                                 if ((unsigned)fd >= fdescp->fd_nfiles ||
 1875                                     fdescp->fd_ofiles[fd] == NULL) {
 1876                                         FILEDESC_SUNLOCK(fdescp);
 1877                                         error = EBADF;
 1878                                         goto out;
 1879                                 }
 1880                                 fp = fdescp->fd_ofiles[fd];
 1881                                 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
 1882                                         FILEDESC_SUNLOCK(fdescp);
 1883                                         error = EOPNOTSUPP;
 1884                                         goto out;
 1885                                 }
 1886 
 1887                         }
 1888 
 1889                         /*
 1890                          * Now replace the integer FDs with pointers to the
 1891                          * associated global file table entry..
 1892                          */
 1893                         newlen = oldfds * sizeof(struct file *);
 1894                         *controlp = sbcreatecontrol(NULL, newlen,
 1895                             SCM_RIGHTS, SOL_SOCKET);
 1896                         if (*controlp == NULL) {
 1897                                 FILEDESC_SUNLOCK(fdescp);
 1898                                 error = E2BIG;
 1899                                 goto out;
 1900                         }
 1901                         fdp = data;
 1902                         rp = (struct file **)
 1903                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
 1904                         for (i = 0; i < oldfds; i++) {
 1905                                 fp = fdescp->fd_ofiles[*fdp++];
 1906                                 *rp++ = fp;
 1907                                 unp_internalize_fp(fp);
 1908                         }
 1909                         FILEDESC_SUNLOCK(fdescp);
 1910                         break;
 1911 
 1912                 case SCM_TIMESTAMP:
 1913                         *controlp = sbcreatecontrol(NULL, sizeof(*tv),
 1914                             SCM_TIMESTAMP, SOL_SOCKET);
 1915                         if (*controlp == NULL) {
 1916                                 error = ENOBUFS;
 1917                                 goto out;
 1918                         }
 1919                         tv = (struct timeval *)
 1920                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
 1921                         microtime(tv);
 1922                         break;
 1923 
 1924                 default:
 1925                         error = EINVAL;
 1926                         goto out;
 1927                 }
 1928 
 1929                 controlp = &(*controlp)->m_next;
 1930                 if (CMSG_SPACE(datalen) < clen) {
 1931                         clen -= CMSG_SPACE(datalen);
 1932                         cm = (struct cmsghdr *)
 1933                             ((caddr_t)cm + CMSG_SPACE(datalen));
 1934                 } else {
 1935                         clen = 0;
 1936                         cm = NULL;
 1937                 }
 1938         }
 1939 
 1940 out:
 1941         m_freem(control);
 1942         return (error);
 1943 }
 1944 
 1945 static struct mbuf *
 1946 unp_addsockcred(struct thread *td, struct mbuf *control)
 1947 {
 1948         struct mbuf *m, *n, *n_prev;
 1949         struct sockcred *sc;
 1950         const struct cmsghdr *cm;
 1951         int ngroups;
 1952         int i;
 1953 
 1954         ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
 1955         m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
 1956         if (m == NULL)
 1957                 return (control);
 1958 
 1959         sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
 1960         sc->sc_uid = td->td_ucred->cr_ruid;
 1961         sc->sc_euid = td->td_ucred->cr_uid;
 1962         sc->sc_gid = td->td_ucred->cr_rgid;
 1963         sc->sc_egid = td->td_ucred->cr_gid;
 1964         sc->sc_ngroups = ngroups;
 1965         for (i = 0; i < sc->sc_ngroups; i++)
 1966                 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
 1967 
 1968         /*
 1969          * Unlink SCM_CREDS control messages (struct cmsgcred), since just
 1970          * created SCM_CREDS control message (struct sockcred) has another
 1971          * format.
 1972          */
 1973         if (control != NULL)
 1974                 for (n = control, n_prev = NULL; n != NULL;) {
 1975                         cm = mtod(n, struct cmsghdr *);
 1976                         if (cm->cmsg_level == SOL_SOCKET &&
 1977                             cm->cmsg_type == SCM_CREDS) {
 1978                                 if (n_prev == NULL)
 1979                                         control = n->m_next;
 1980                                 else
 1981                                         n_prev->m_next = n->m_next;
 1982                                 n = m_free(n);
 1983                         } else {
 1984                                 n_prev = n;
 1985                                 n = n->m_next;
 1986                         }
 1987                 }
 1988 
 1989         /* Prepend it to the head. */
 1990         m->m_next = control;
 1991         return (m);
 1992 }
 1993 
 1994 static struct unpcb *
 1995 fptounp(struct file *fp)
 1996 {
 1997         struct socket *so;
 1998 
 1999         if (fp->f_type != DTYPE_SOCKET)
 2000                 return (NULL);
 2001         if ((so = fp->f_data) == NULL)
 2002                 return (NULL);
 2003         if (so->so_proto->pr_domain != &localdomain)
 2004                 return (NULL);
 2005         return sotounpcb(so);
 2006 }
 2007 
 2008 static void
 2009 unp_discard(struct file *fp)
 2010 {
 2011         struct unp_defer *dr;
 2012 
 2013         if (unp_externalize_fp(fp)) {
 2014                 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
 2015                 dr->ud_fp = fp;
 2016                 UNP_DEFERRED_LOCK();
 2017                 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
 2018                 UNP_DEFERRED_UNLOCK();
 2019                 atomic_add_int(&unp_defers_count, 1);
 2020                 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
 2021         } else
 2022                 (void) closef(fp, (struct thread *)NULL);
 2023 }
 2024 
 2025 static void
 2026 unp_process_defers(void *arg __unused, int pending)
 2027 {
 2028         struct unp_defer *dr;
 2029         SLIST_HEAD(, unp_defer) drl;
 2030         int count;
 2031 
 2032         SLIST_INIT(&drl);
 2033         for (;;) {
 2034                 UNP_DEFERRED_LOCK();
 2035                 if (SLIST_FIRST(&unp_defers) == NULL) {
 2036                         UNP_DEFERRED_UNLOCK();
 2037                         break;
 2038                 }
 2039                 SLIST_SWAP(&unp_defers, &drl, unp_defer);
 2040                 UNP_DEFERRED_UNLOCK();
 2041                 count = 0;
 2042                 while ((dr = SLIST_FIRST(&drl)) != NULL) {
 2043                         SLIST_REMOVE_HEAD(&drl, ud_link);
 2044                         closef(dr->ud_fp, NULL);
 2045                         free(dr, M_TEMP);
 2046                         count++;
 2047                 }
 2048                 atomic_add_int(&unp_defers_count, -count);
 2049         }
 2050 }
 2051 
 2052 static void
 2053 unp_internalize_fp(struct file *fp)
 2054 {
 2055         struct unpcb *unp;
 2056 
 2057         UNP_LINK_WLOCK();
 2058         if ((unp = fptounp(fp)) != NULL) {
 2059                 unp->unp_file = fp;
 2060                 unp->unp_msgcount++;
 2061         }
 2062         fhold(fp);
 2063         unp_rights++;
 2064         UNP_LINK_WUNLOCK();
 2065 }
 2066 
 2067 static int
 2068 unp_externalize_fp(struct file *fp)
 2069 {
 2070         struct unpcb *unp;
 2071         int ret;
 2072 
 2073         UNP_LINK_WLOCK();
 2074         if ((unp = fptounp(fp)) != NULL) {
 2075                 unp->unp_msgcount--;
 2076                 ret = 1;
 2077         } else
 2078                 ret = 0;
 2079         unp_rights--;
 2080         UNP_LINK_WUNLOCK();
 2081         return (ret);
 2082 }
 2083 
 2084 /*
 2085  * unp_defer indicates whether additional work has been defered for a future
 2086  * pass through unp_gc().  It is thread local and does not require explicit
 2087  * synchronization.
 2088  */
 2089 static int      unp_marked;
 2090 static int      unp_unreachable;
 2091 
 2092 static void
 2093 unp_accessable(struct file *fp)
 2094 {
 2095         struct unpcb *unp;
 2096 
 2097         if ((unp = fptounp(fp)) == NULL)
 2098                 return;
 2099         if (unp->unp_gcflag & UNPGC_REF)
 2100                 return;
 2101         unp->unp_gcflag &= ~UNPGC_DEAD;
 2102         unp->unp_gcflag |= UNPGC_REF;
 2103         unp_marked++;
 2104 }
 2105 
 2106 static void
 2107 unp_gc_process(struct unpcb *unp)
 2108 {
 2109         struct socket *soa;
 2110         struct socket *so;
 2111         struct file *fp;
 2112 
 2113         /* Already processed. */
 2114         if (unp->unp_gcflag & UNPGC_SCANNED)
 2115                 return;
 2116         fp = unp->unp_file;
 2117 
 2118         /*
 2119          * Check for a socket potentially in a cycle.  It must be in a
 2120          * queue as indicated by msgcount, and this must equal the file
 2121          * reference count.  Note that when msgcount is 0 the file is NULL.
 2122          */
 2123         if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
 2124             unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
 2125                 unp->unp_gcflag |= UNPGC_DEAD;
 2126                 unp_unreachable++;
 2127                 return;
 2128         }
 2129 
 2130         /*
 2131          * Mark all sockets we reference with RIGHTS.
 2132          */
 2133         so = unp->unp_socket;
 2134         SOCKBUF_LOCK(&so->so_rcv);
 2135         unp_scan(so->so_rcv.sb_mb, unp_accessable);
 2136         SOCKBUF_UNLOCK(&so->so_rcv);
 2137 
 2138         /*
 2139          * Mark all sockets in our accept queue.
 2140          */
 2141         ACCEPT_LOCK();
 2142         TAILQ_FOREACH(soa, &so->so_comp, so_list) {
 2143                 SOCKBUF_LOCK(&soa->so_rcv);
 2144                 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
 2145                 SOCKBUF_UNLOCK(&soa->so_rcv);
 2146         }
 2147         ACCEPT_UNLOCK();
 2148         unp->unp_gcflag |= UNPGC_SCANNED;
 2149 }
 2150 
 2151 static int unp_recycled;
 2152 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0, 
 2153     "Number of unreachable sockets claimed by the garbage collector.");
 2154 
 2155 static int unp_taskcount;
 2156 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0, 
 2157     "Number of times the garbage collector has run.");
 2158 
 2159 static void
 2160 unp_gc(__unused void *arg, int pending)
 2161 {
 2162         struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
 2163                                     NULL };
 2164         struct unp_head **head;
 2165         struct file *f, **unref;
 2166         struct unpcb *unp;
 2167         int i, total;
 2168 
 2169         unp_taskcount++;
 2170         UNP_LIST_LOCK();
 2171         /*
 2172          * First clear all gc flags from previous runs.
 2173          */
 2174         for (head = heads; *head != NULL; head++)
 2175                 LIST_FOREACH(unp, *head, unp_link)
 2176                         unp->unp_gcflag = 0;
 2177 
 2178         /*
 2179          * Scan marking all reachable sockets with UNPGC_REF.  Once a socket
 2180          * is reachable all of the sockets it references are reachable.
 2181          * Stop the scan once we do a complete loop without discovering
 2182          * a new reachable socket.
 2183          */
 2184         do {
 2185                 unp_unreachable = 0;
 2186                 unp_marked = 0;
 2187                 for (head = heads; *head != NULL; head++)
 2188                         LIST_FOREACH(unp, *head, unp_link)
 2189                                 unp_gc_process(unp);
 2190         } while (unp_marked);
 2191         UNP_LIST_UNLOCK();
 2192         if (unp_unreachable == 0)
 2193                 return;
 2194 
 2195         /*
 2196          * Allocate space for a local list of dead unpcbs.
 2197          */
 2198         unref = malloc(unp_unreachable * sizeof(struct file *),
 2199             M_TEMP, M_WAITOK);
 2200 
 2201         /*
 2202          * Iterate looking for sockets which have been specifically marked
 2203          * as as unreachable and store them locally.
 2204          */
 2205         UNP_LINK_RLOCK();
 2206         UNP_LIST_LOCK();
 2207         for (total = 0, head = heads; *head != NULL; head++)
 2208                 LIST_FOREACH(unp, *head, unp_link)
 2209                         if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
 2210                                 f = unp->unp_file;
 2211                                 if (unp->unp_msgcount == 0 || f == NULL ||
 2212                                     f->f_count != unp->unp_msgcount)
 2213                                         continue;
 2214                                 unref[total++] = f;
 2215                                 fhold(f);
 2216                                 KASSERT(total <= unp_unreachable,
 2217                                     ("unp_gc: incorrect unreachable count."));
 2218                         }
 2219         UNP_LIST_UNLOCK();
 2220         UNP_LINK_RUNLOCK();
 2221 
 2222         /*
 2223          * Now flush all sockets, free'ing rights.  This will free the
 2224          * struct files associated with these sockets but leave each socket
 2225          * with one remaining ref.
 2226          */
 2227         for (i = 0; i < total; i++) {
 2228                 struct socket *so;
 2229 
 2230                 so = unref[i]->f_data;
 2231                 CURVNET_SET(so->so_vnet);
 2232                 sorflush(so);
 2233                 CURVNET_RESTORE();
 2234         }
 2235 
 2236         /*
 2237          * And finally release the sockets so they can be reclaimed.
 2238          */
 2239         for (i = 0; i < total; i++)
 2240                 fdrop(unref[i], NULL);
 2241         unp_recycled += total;
 2242         free(unref, M_TEMP);
 2243 }
 2244 
 2245 static void
 2246 unp_dispose(struct mbuf *m)
 2247 {
 2248 
 2249         if (m)
 2250                 unp_scan(m, unp_discard);
 2251 }
 2252 
 2253 static void
 2254 unp_scan(struct mbuf *m0, void (*op)(struct file *))
 2255 {
 2256         struct mbuf *m;
 2257         struct file **rp;
 2258         struct cmsghdr *cm;
 2259         void *data;
 2260         int i;
 2261         socklen_t clen, datalen;
 2262         int qfds;
 2263 
 2264         while (m0 != NULL) {
 2265                 for (m = m0; m; m = m->m_next) {
 2266                         if (m->m_type != MT_CONTROL)
 2267                                 continue;
 2268 
 2269                         cm = mtod(m, struct cmsghdr *);
 2270                         clen = m->m_len;
 2271 
 2272                         while (cm != NULL) {
 2273                                 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
 2274                                         break;
 2275 
 2276                                 data = CMSG_DATA(cm);
 2277                                 datalen = (caddr_t)cm + cm->cmsg_len
 2278                                     - (caddr_t)data;
 2279 
 2280                                 if (cm->cmsg_level == SOL_SOCKET &&
 2281                                     cm->cmsg_type == SCM_RIGHTS) {
 2282                                         qfds = datalen / sizeof (struct file *);
 2283                                         rp = data;
 2284                                         for (i = 0; i < qfds; i++)
 2285                                                 (*op)(*rp++);
 2286                                 }
 2287 
 2288                                 if (CMSG_SPACE(datalen) < clen) {
 2289                                         clen -= CMSG_SPACE(datalen);
 2290                                         cm = (struct cmsghdr *)
 2291                                             ((caddr_t)cm + CMSG_SPACE(datalen));
 2292                                 } else {
 2293                                         clen = 0;
 2294                                         cm = NULL;
 2295                                 }
 2296                         }
 2297                 }
 2298                 m0 = m0->m_act;
 2299         }
 2300 }
 2301 
 2302 #ifdef DDB
 2303 static void
 2304 db_print_indent(int indent)
 2305 {
 2306         int i;
 2307 
 2308         for (i = 0; i < indent; i++)
 2309                 db_printf(" ");
 2310 }
 2311 
 2312 static void
 2313 db_print_unpflags(int unp_flags)
 2314 {
 2315         int comma;
 2316 
 2317         comma = 0;
 2318         if (unp_flags & UNP_HAVEPC) {
 2319                 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
 2320                 comma = 1;
 2321         }
 2322         if (unp_flags & UNP_HAVEPCCACHED) {
 2323                 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
 2324                 comma = 1;
 2325         }
 2326         if (unp_flags & UNP_WANTCRED) {
 2327                 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
 2328                 comma = 1;
 2329         }
 2330         if (unp_flags & UNP_CONNWAIT) {
 2331                 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
 2332                 comma = 1;
 2333         }
 2334         if (unp_flags & UNP_CONNECTING) {
 2335                 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
 2336                 comma = 1;
 2337         }
 2338         if (unp_flags & UNP_BINDING) {
 2339                 db_printf("%sUNP_BINDING", comma ? ", " : "");
 2340                 comma = 1;
 2341         }
 2342 }
 2343 
 2344 static void
 2345 db_print_xucred(int indent, struct xucred *xu)
 2346 {
 2347         int comma, i;
 2348 
 2349         db_print_indent(indent);
 2350         db_printf("cr_version: %u   cr_uid: %u   cr_ngroups: %d\n",
 2351             xu->cr_version, xu->cr_uid, xu->cr_ngroups);
 2352         db_print_indent(indent);
 2353         db_printf("cr_groups: ");
 2354         comma = 0;
 2355         for (i = 0; i < xu->cr_ngroups; i++) {
 2356                 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
 2357                 comma = 1;
 2358         }
 2359         db_printf("\n");
 2360 }
 2361 
 2362 static void
 2363 db_print_unprefs(int indent, struct unp_head *uh)
 2364 {
 2365         struct unpcb *unp;
 2366         int counter;
 2367 
 2368         counter = 0;
 2369         LIST_FOREACH(unp, uh, unp_reflink) {
 2370                 if (counter % 4 == 0)
 2371                         db_print_indent(indent);
 2372                 db_printf("%p  ", unp);
 2373                 if (counter % 4 == 3)
 2374                         db_printf("\n");
 2375                 counter++;
 2376         }
 2377         if (counter != 0 && counter % 4 != 0)
 2378                 db_printf("\n");
 2379 }
 2380 
 2381 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
 2382 {
 2383         struct unpcb *unp;
 2384 
 2385         if (!have_addr) {
 2386                 db_printf("usage: show unpcb <addr>\n");
 2387                 return;
 2388         }
 2389         unp = (struct unpcb *)addr;
 2390 
 2391         db_printf("unp_socket: %p   unp_vnode: %p\n", unp->unp_socket,
 2392             unp->unp_vnode);
 2393 
 2394         db_printf("unp_ino: %d   unp_conn: %p\n", unp->unp_ino,
 2395             unp->unp_conn);
 2396 
 2397         db_printf("unp_refs:\n");
 2398         db_print_unprefs(2, &unp->unp_refs);
 2399 
 2400         /* XXXRW: Would be nice to print the full address, if any. */
 2401         db_printf("unp_addr: %p\n", unp->unp_addr);
 2402 
 2403         db_printf("unp_cc: %d   unp_mbcnt: %d   unp_gencnt: %llu\n",
 2404             unp->unp_cc, unp->unp_mbcnt,
 2405             (unsigned long long)unp->unp_gencnt);
 2406 
 2407         db_printf("unp_flags: %x (", unp->unp_flags);
 2408         db_print_unpflags(unp->unp_flags);
 2409         db_printf(")\n");
 2410 
 2411         db_printf("unp_peercred:\n");
 2412         db_print_xucred(2, &unp->unp_peercred);
 2413 
 2414         db_printf("unp_refcount: %u\n", unp->unp_refcount);
 2415 }
 2416 #endif

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