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

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