sys/kern/uipc_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2004-2009 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
  32  */
  33
  34 /*
  35  * UNIX Domain (Local) Sockets
  36  *
  37  * This is an implementation of UNIX (local) domain sockets.  Each socket has
  38  * an associated struct unpcb (UNIX protocol control block).  Stream sockets
  39  * may be connected to 0 or 1 other socket.  Datagram sockets may be
  40  * connected to 0, 1, or many other sockets.  Sockets may be created and
  41  * connected in pairs (socketpair(2)), or bound/connected to using the file
  42  * system name space.  For most purposes, only the receive socket buffer is
  43  * used, as sending on one socket delivers directly to the receive socket
  44  * buffer of a second socket.
  45  *
  46  * The implementation is substantially complicated by the fact that
  47  * "ancillary data", such as file descriptors or credentials, may be passed
  48  * across UNIX domain sockets.  The potential for passing UNIX domain sockets
  49  * over other UNIX domain sockets requires the implementation of a simple
  50  * garbage collector to find and tear down cycles of disconnected sockets.
  51  *
  52  * TODO:
  53  *      RDM
  54  *      distinguish datagram size limits from flow control limits in SEQPACKET
  55  *      rethink name space problems
  56  *      need a proper out-of-band
  57  */
  58
  59 #include <sys/cdefs.h>
  60 __FBSDID("$FreeBSD$");
  61
  62 #include "opt_ddb.h"
  63
  64 #include <sys/param.h>
  65 #include <sys/capability.h>
  66 #include <sys/domain.h>
  67 #include <sys/fcntl.h>
  68 #include <sys/malloc.h>         /* XXX must be before <sys/file.h> */
  69 #include <sys/eventhandler.h>
  70 #include <sys/file.h>
  71 #include <sys/filedesc.h>
  72 #include <sys/kernel.h>
  73 #include <sys/lock.h>
  74 #include <sys/mbuf.h>
  75 #include <sys/mount.h>
  76 #include <sys/mutex.h>
  77 #include <sys/namei.h>
  78 #include <sys/proc.h>
  79 #include <sys/protosw.h>
  80 #include <sys/queue.h>
  81 #include <sys/resourcevar.h>
  82 #include <sys/rwlock.h>
  83 #include <sys/socket.h>
  84 #include <sys/socketvar.h>
  85 #include <sys/signalvar.h>
  86 #include <sys/stat.h>
  87 #include <sys/sx.h>
  88 #include <sys/sysctl.h>
  89 #include <sys/systm.h>
  90 #include <sys/taskqueue.h>
  91 #include <sys/un.h>
  92 #include <sys/unpcb.h>
  93 #include <sys/vnode.h>
  94
  95 #include <net/vnet.h>
  96
  97 #ifdef DDB
  98 #include <ddb/ddb.h>
  99 #endif
 100
 101 #include <security/mac/mac_framework.h>
 102
 103 #include <vm/uma.h>
 104
 105 MALLOC_DECLARE(M_FILECAPS);
 106
 107 /*
 108  * Locking key:
 109  * (l)  Locked using list lock
 110  * (g)  Locked using linkage lock
 111  */
 112
 113 static uma_zone_t       unp_zone;
 114 static unp_gen_t        unp_gencnt;     /* (l) */
 115 static u_int            unp_count;      /* (l) Count of local sockets. */
 116 static ino_t            unp_ino;        /* Prototype for fake inode numbers. */
 117 static int              unp_rights;     /* (g) File descriptors in flight. */
 118 static struct unp_head  unp_shead;      /* (l) List of stream sockets. */
 119 static struct unp_head  unp_dhead;      /* (l) List of datagram sockets. */
 120 static struct unp_head  unp_sphead;     /* (l) List of seqpacket sockets. */
 121
 122 struct unp_defer {
 123         SLIST_ENTRY(unp_defer) ud_link;
 124         struct file *ud_fp;
 125 };
 126 static SLIST_HEAD(, unp_defer) unp_defers;
 127 static int unp_defers_count;
 128
 129 static const struct sockaddr    sun_noname = { sizeof(sun_noname), AF_LOCAL };
 130
 131 /*
 132  * Garbage collection of cyclic file descriptor/socket references occurs
 133  * asynchronously in a taskqueue context in order to avoid recursion and
 134  * reentrance in the UNIX domain socket, file descriptor, and socket layer
 135  * code.  See unp_gc() for a full description.
 136  */
 137 static struct timeout_task unp_gc_task;
 138
 139 /*
 140  * The close of unix domain sockets attached as SCM_RIGHTS is
 141  * postponed to the taskqueue, to avoid arbitrary recursion depth.
 142  * The attached sockets might have another sockets attached.
 143  */
 144 static struct task      unp_defer_task;
 145
 146 /*
 147  * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
 148  * stream sockets, although the total for sender and receiver is actually
 149  * only PIPSIZ.
 150  *
 151  * Datagram sockets really use the sendspace as the maximum datagram size,
 152  * and don't really want to reserve the sendspace.  Their recvspace should be
 153  * large enough for at least one max-size datagram plus address.
 154  */
 155 #ifndef PIPSIZ
 156 #define PIPSIZ  8192
 157 #endif
 158 static u_long   unpst_sendspace = PIPSIZ;
 159 static u_long   unpst_recvspace = PIPSIZ;
 160 static u_long   unpdg_sendspace = 2*1024;       /* really max datagram size */
 161 static u_long   unpdg_recvspace = 4*1024;
 162 static u_long   unpsp_sendspace = PIPSIZ;       /* really max datagram size */
 163 static u_long   unpsp_recvspace = PIPSIZ;
 164
 165 static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
 166 static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
 167     "SOCK_STREAM");
 168 static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
 169 static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
 170     "SOCK_SEQPACKET");
 171
 172 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
 173            &unpst_sendspace, 0, "Default stream send space.");
 174 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
 175            &unpst_recvspace, 0, "Default stream receive space.");
 176 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
 177            &unpdg_sendspace, 0, "Default datagram send space.");
 178 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
 179            &unpdg_recvspace, 0, "Default datagram receive space.");
 180 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
 181            &unpsp_sendspace, 0, "Default seqpacket send space.");
 182 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
 183            &unpsp_recvspace, 0, "Default seqpacket receive space.");
 184 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
 185     "File descriptors in flight.");
 186 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
 187     &unp_defers_count, 0,
 188     "File descriptors deferred to taskqueue for close.");
 189
 190 /*
 191  * Locking and synchronization:
 192  *
 193  * Three types of locks exit in the local domain socket implementation: a
 194  * global list mutex, a global linkage rwlock, and per-unpcb mutexes.  Of the
 195  * global locks, the list lock protects the socket count, global generation
 196  * number, and stream/datagram global lists.  The linkage lock protects the
 197  * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
 198  * held exclusively over the acquisition of multiple unpcb locks to prevent
 199  * deadlock.
 200  *
 201  * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
 202  * allocated in pru_attach() and freed in pru_detach().  The validity of that
 203  * pointer is an invariant, so no lock is required to dereference the so_pcb
 204  * pointer if a valid socket reference is held by the caller.  In practice,
 205  * this is always true during operations performed on a socket.  Each unpcb
 206  * has a back-pointer to its socket, unp_socket, which will be stable under
 207  * the same circumstances.
 208  *
 209  * This pointer may only be safely dereferenced as long as a valid reference
 210  * to the unpcb is held.  Typically, this reference will be from the socket,
 211  * or from another unpcb when the referring unpcb's lock is held (in order
 212  * that the reference not be invalidated during use).  For example, to follow
 213  * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
 214  * as unp_socket remains valid as long as the reference to unp_conn is valid.
 215  *
 216  * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx.  Individual
 217  * atomic reads without the lock may be performed "lockless", but more
 218  * complex reads and read-modify-writes require the mutex to be held.  No
 219  * lock order is defined between unpcb locks -- multiple unpcb locks may be
 220  * acquired at the same time only when holding the linkage rwlock
 221  * exclusively, which prevents deadlocks.
 222  *
 223  * Blocking with UNIX domain sockets is a tricky issue: unlike most network
 224  * protocols, bind() is a non-atomic operation, and connect() requires
 225  * potential sleeping in the protocol, due to potentially waiting on local or
 226  * distributed file systems.  We try to separate "lookup" operations, which
 227  * may sleep, and the IPC operations themselves, which typically can occur
 228  * with relative atomicity as locks can be held over the entire operation.
 229  *
 230  * Another tricky issue is simultaneous multi-threaded or multi-process
 231  * access to a single UNIX domain socket.  These are handled by the flags
 232  * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
 233  * binding, both of which involve dropping UNIX domain socket locks in order
 234  * to perform namei() and other file system operations.
 235  */
 236 static struct rwlock    unp_link_rwlock;
 237 static struct mtx       unp_list_lock;
 238 static struct mtx       unp_defers_lock;
 239
 240 #define UNP_LINK_LOCK_INIT()            rw_init(&unp_link_rwlock,       \
 241                                             "unp_link_rwlock")
 242
 243 #define UNP_LINK_LOCK_ASSERT()  rw_assert(&unp_link_rwlock,     \
 244                                             RA_LOCKED)
 245 #define UNP_LINK_UNLOCK_ASSERT()        rw_assert(&unp_link_rwlock,     \
 246                                             RA_UNLOCKED)
 247
 248 #define UNP_LINK_RLOCK()                rw_rlock(&unp_link_rwlock)
 249 #define UNP_LINK_RUNLOCK()              rw_runlock(&unp_link_rwlock)
 250 #define UNP_LINK_WLOCK()                rw_wlock(&unp_link_rwlock)
 251 #define UNP_LINK_WUNLOCK()              rw_wunlock(&unp_link_rwlock)
 252 #define UNP_LINK_WLOCK_ASSERT()         rw_assert(&unp_link_rwlock,     \
 253                                             RA_WLOCKED)
 254
 255 #define UNP_LIST_LOCK_INIT()            mtx_init(&unp_list_lock,        \
 256                                             "unp_list_lock", NULL, MTX_DEF)
 257 #define UNP_LIST_LOCK()                 mtx_lock(&unp_list_lock)
 258 #define UNP_LIST_UNLOCK()               mtx_unlock(&unp_list_lock)
 259
 260 #define UNP_DEFERRED_LOCK_INIT()        mtx_init(&unp_defers_lock, \
 261                                             "unp_defer", NULL, MTX_DEF)
 262 #define UNP_DEFERRED_LOCK()             mtx_lock(&unp_defers_lock)
 263 #define UNP_DEFERRED_UNLOCK()           mtx_unlock(&unp_defers_lock)
 264
 265 #define UNP_PCB_LOCK_INIT(unp)          mtx_init(&(unp)->unp_mtx,       \
 266                                             "unp_mtx", "unp_mtx",       \
 267                                             MTX_DUPOK|MTX_DEF|MTX_RECURSE)
 268 #define UNP_PCB_LOCK_DESTROY(unp)       mtx_destroy(&(unp)->unp_mtx)
 269 #define UNP_PCB_LOCK(unp)               mtx_lock(&(unp)->unp_mtx)
 270 #define UNP_PCB_UNLOCK(unp)             mtx_unlock(&(unp)->unp_mtx)
 271 #define UNP_PCB_LOCK_ASSERT(unp)        mtx_assert(&(unp)->unp_mtx, MA_OWNED)
 272
 273 static int      uipc_connect2(struct socket *, struct socket *);
 274 static int      uipc_ctloutput(struct socket *, struct sockopt *);
 275 static int      unp_connect(struct socket *, struct sockaddr *,
 276                     struct thread *);
 277 static int      unp_connectat(int, struct socket *, struct sockaddr *,
 278                     struct thread *);
 279 static int      unp_connect2(struct socket *so, struct socket *so2, int);
 280 static void     unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
 281 static void     unp_dispose(struct mbuf *);
 282 static void     unp_shutdown(struct unpcb *);
 283 static void     unp_drop(struct unpcb *, int);
 284 static void     unp_gc(__unused void *, int);
 285 static void     unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
 286 static void     unp_discard(struct file *);
 287 static void     unp_freerights(struct filedescent **, int);
 288 static void     unp_init(void);
 289 static int      unp_internalize(struct mbuf **, struct thread *);
 290 static void     unp_internalize_fp(struct file *);
 291 static int      unp_externalize(struct mbuf *, struct mbuf **, int);
 292 static int      unp_externalize_fp(struct file *);
 293 static struct mbuf      *unp_addsockcred(struct thread *, struct mbuf *);
 294 static void     unp_process_defers(void * __unused, int);
 295
 296 /*
 297  * Definitions of protocols supported in the LOCAL domain.
 298  */
 299 static struct domain localdomain;
 300 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
 301 static struct pr_usrreqs uipc_usrreqs_seqpacket;
 302 static struct protosw localsw[] = {
 303 {
 304         .pr_type =              SOCK_STREAM,
 305         .pr_domain =            &localdomain,
 306         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
 307         .pr_ctloutput =         &uipc_ctloutput,
 308         .pr_usrreqs =           &uipc_usrreqs_stream
 309 },
 310 {
 311         .pr_type =              SOCK_DGRAM,
 312         .pr_domain =            &localdomain,
 313         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_RIGHTS,
 314         .pr_ctloutput =         &uipc_ctloutput,
 315         .pr_usrreqs =           &uipc_usrreqs_dgram
 316 },
 317 {
 318         .pr_type =              SOCK_SEQPACKET,
 319         .pr_domain =            &localdomain,
 320
 321         /*
 322          * XXXRW: For now, PR_ADDR because soreceive will bump into them
 323          * due to our use of sbappendaddr.  A new sbappend variants is needed
 324          * that supports both atomic record writes and control data.
 325          */
 326         .pr_flags =             PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
 327                                     PR_RIGHTS,
 328         .pr_ctloutput =         &uipc_ctloutput,
 329         .pr_usrreqs =           &uipc_usrreqs_seqpacket,
 330 },
 331 };
 332
 333 static struct domain localdomain = {
 334         .dom_family =           AF_LOCAL,
 335         .dom_name =             "local",
 336         .dom_init =             unp_init,
 337         .dom_externalize =      unp_externalize,
 338         .dom_dispose =          unp_dispose,
 339         .dom_protosw =          localsw,
 340         .dom_protoswNPROTOSW =  &localsw[sizeof(localsw)/sizeof(localsw[0])]
 341 };
 342 DOMAIN_SET(local);
 343
 344 static void
 345 uipc_abort(struct socket *so)
 346 {
 347         struct unpcb *unp, *unp2;
 348
 349         unp = sotounpcb(so);
 350         KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
 351
 352         UNP_LINK_WLOCK();
 353         UNP_PCB_LOCK(unp);
 354         unp2 = unp->unp_conn;
 355         if (unp2 != NULL) {
 356                 UNP_PCB_LOCK(unp2);
 357                 unp_drop(unp2, ECONNABORTED);
 358                 UNP_PCB_UNLOCK(unp2);
 359         }
 360         UNP_PCB_UNLOCK(unp);
 361         UNP_LINK_WUNLOCK();
 362 }
 363
 364 static int
 365 uipc_accept(struct socket *so, struct sockaddr **nam)
 366 {
 367         struct unpcb *unp, *unp2;
 368         const struct sockaddr *sa;
 369
 370         /*
 371          * Pass back name of connected socket, if it was bound and we are
 372          * still connected (our peer may have closed already!).
 373          */
 374         unp = sotounpcb(so);
 375         KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
 376
 377         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 378         UNP_LINK_RLOCK();
 379         unp2 = unp->unp_conn;
 380         if (unp2 != NULL && unp2->unp_addr != NULL) {
 381                 UNP_PCB_LOCK(unp2);
 382                 sa = (struct sockaddr *) unp2->unp_addr;
 383                 bcopy(sa, *nam, sa->sa_len);
 384                 UNP_PCB_UNLOCK(unp2);
 385         } else {
 386                 sa = &sun_noname;
 387                 bcopy(sa, *nam, sa->sa_len);
 388         }
 389         UNP_LINK_RUNLOCK();
 390         return (0);
 391 }
 392
 393 static int
 394 uipc_attach(struct socket *so, int proto, struct thread *td)
 395 {
 396         u_long sendspace, recvspace;
 397         struct unpcb *unp;
 398         int error;
 399
 400         KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
 401         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 402                 switch (so->so_type) {
 403                 case SOCK_STREAM:
 404                         sendspace = unpst_sendspace;
 405                         recvspace = unpst_recvspace;
 406                         break;
 407
 408                 case SOCK_DGRAM:
 409                         sendspace = unpdg_sendspace;
 410                         recvspace = unpdg_recvspace;
 411                         break;
 412
 413                 case SOCK_SEQPACKET:
 414                         sendspace = unpsp_sendspace;
 415                         recvspace = unpsp_recvspace;
 416                         break;
 417
 418                 default:
 419                         panic("uipc_attach");
 420                 }
 421                 error = soreserve(so, sendspace, recvspace);
 422                 if (error)
 423                         return (error);
 424         }
 425         unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
 426         if (unp == NULL)
 427                 return (ENOBUFS);
 428         LIST_INIT(&unp->unp_refs);
 429         UNP_PCB_LOCK_INIT(unp);
 430         unp->unp_socket = so;
 431         so->so_pcb = unp;
 432         unp->unp_refcount = 1;
 433
 434         UNP_LIST_LOCK();
 435         unp->unp_gencnt = ++unp_gencnt;
 436         unp_count++;
 437         switch (so->so_type) {
 438         case SOCK_STREAM:
 439                 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
 440                 break;
 441
 442         case SOCK_DGRAM:
 443                 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
 444                 break;
 445
 446         case SOCK_SEQPACKET:
 447                 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
 448                 break;
 449
 450         default:
 451                 panic("uipc_attach");
 452         }
 453         UNP_LIST_UNLOCK();
 454
 455         return (0);
 456 }
 457
 458 static int
 459 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
 460 {
 461         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
 462         struct vattr vattr;
 463         int error, namelen;
 464         struct nameidata nd;
 465         struct unpcb *unp;
 466         struct vnode *vp;
 467         struct mount *mp;
 468         cap_rights_t rights;
 469         char *buf;
 470
 471         unp = sotounpcb(so);
 472         KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
 473
 474         if (soun->sun_len > sizeof(struct sockaddr_un))
 475                 return (EINVAL);
 476         namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
 477         if (namelen <= 0)
 478                 return (EINVAL);
 479
 480         /*
 481          * We don't allow simultaneous bind() calls on a single UNIX domain
 482          * socket, so flag in-progress operations, and return an error if an
 483          * operation is already in progress.
 484          *
 485          * Historically, we have not allowed a socket to be rebound, so this
 486          * also returns an error.  Not allowing re-binding simplifies the
 487          * implementation and avoids a great many possible failure modes.
 488          */
 489         UNP_PCB_LOCK(unp);
 490         if (unp->unp_vnode != NULL) {
 491                 UNP_PCB_UNLOCK(unp);
 492                 return (EINVAL);
 493         }
 494         if (unp->unp_flags & UNP_BINDING) {
 495                 UNP_PCB_UNLOCK(unp);
 496                 return (EALREADY);
 497         }
 498         unp->unp_flags |= UNP_BINDING;
 499         UNP_PCB_UNLOCK(unp);
 500
 501         buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
 502         bcopy(soun->sun_path, buf, namelen);
 503         buf[namelen] = 0;
 504
 505 restart:
 506         NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME,
 507             UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td);
 508 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
 509         error = namei(&nd);
 510         if (error)
 511                 goto error;
 512         vp = nd.ni_vp;
 513         if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
 514                 NDFREE(&nd, NDF_ONLY_PNBUF);
 515                 if (nd.ni_dvp == vp)
 516                         vrele(nd.ni_dvp);
 517                 else
 518                         vput(nd.ni_dvp);
 519                 if (vp != NULL) {
 520                         vrele(vp);
 521                         error = EADDRINUSE;
 522                         goto error;
 523                 }
 524                 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
 525                 if (error)
 526                         goto error;
 527                 goto restart;
 528         }
 529         VATTR_NULL(&vattr);
 530         vattr.va_type = VSOCK;
 531         vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
 532 #ifdef MAC
 533         error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
 534             &vattr);
 535 #endif
 536         if (error == 0)
 537                 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
 538         NDFREE(&nd, NDF_ONLY_PNBUF);
 539         vput(nd.ni_dvp);
 540         if (error) {
 541                 vn_finished_write(mp);
 542                 goto error;
 543         }
 544         vp = nd.ni_vp;
 545         ASSERT_VOP_ELOCKED(vp, "uipc_bind");
 546         soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
 547
 548         UNP_LINK_WLOCK();
 549         UNP_PCB_LOCK(unp);
 550         VOP_UNP_BIND(vp, unp->unp_socket);
 551         unp->unp_vnode = vp;
 552         unp->unp_addr = soun;
 553         unp->unp_flags &= ~UNP_BINDING;
 554         UNP_PCB_UNLOCK(unp);
 555         UNP_LINK_WUNLOCK();
 556         VOP_UNLOCK(vp, 0);
 557         vn_finished_write(mp);
 558         free(buf, M_TEMP);
 559         return (0);
 560
 561 error:
 562         UNP_PCB_LOCK(unp);
 563         unp->unp_flags &= ~UNP_BINDING;
 564         UNP_PCB_UNLOCK(unp);
 565         free(buf, M_TEMP);
 566         return (error);
 567 }
 568
 569 static int
 570 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 571 {
 572
 573         return (uipc_bindat(AT_FDCWD, so, nam, td));
 574 }
 575
 576 static int
 577 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 578 {
 579         int error;
 580
 581         KASSERT(td == curthread, ("uipc_connect: td != curthread"));
 582         UNP_LINK_WLOCK();
 583         error = unp_connect(so, nam, td);
 584         UNP_LINK_WUNLOCK();
 585         return (error);
 586 }
 587
 588 static int
 589 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
 590     struct thread *td)
 591 {
 592         int error;
 593
 594         KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
 595         UNP_LINK_WLOCK();
 596         error = unp_connectat(fd, so, nam, td);
 597         UNP_LINK_WUNLOCK();
 598         return (error);
 599 }
 600
 601 static void
 602 uipc_close(struct socket *so)
 603 {
 604         struct unpcb *unp, *unp2;
 605
 606         unp = sotounpcb(so);
 607         KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
 608
 609         UNP_LINK_WLOCK();
 610         UNP_PCB_LOCK(unp);
 611         unp2 = unp->unp_conn;
 612         if (unp2 != NULL) {
 613                 UNP_PCB_LOCK(unp2);
 614                 unp_disconnect(unp, unp2);
 615                 UNP_PCB_UNLOCK(unp2);
 616         }
 617         UNP_PCB_UNLOCK(unp);
 618         UNP_LINK_WUNLOCK();
 619 }
 620
 621 static int
 622 uipc_connect2(struct socket *so1, struct socket *so2)
 623 {
 624         struct unpcb *unp, *unp2;
 625         int error;
 626
 627         UNP_LINK_WLOCK();
 628         unp = so1->so_pcb;
 629         KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
 630         UNP_PCB_LOCK(unp);
 631         unp2 = so2->so_pcb;
 632         KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
 633         UNP_PCB_LOCK(unp2);
 634         error = unp_connect2(so1, so2, PRU_CONNECT2);
 635         UNP_PCB_UNLOCK(unp2);
 636         UNP_PCB_UNLOCK(unp);
 637         UNP_LINK_WUNLOCK();
 638         return (error);
 639 }
 640
 641 static void
 642 uipc_detach(struct socket *so)
 643 {
 644         struct unpcb *unp, *unp2;
 645         struct sockaddr_un *saved_unp_addr;
 646         struct vnode *vp;
 647         int freeunp, local_unp_rights;
 648
 649         unp = sotounpcb(so);
 650         KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
 651
 652         UNP_LINK_WLOCK();
 653         UNP_LIST_LOCK();
 654         UNP_PCB_LOCK(unp);
 655         LIST_REMOVE(unp, unp_link);
 656         unp->unp_gencnt = ++unp_gencnt;
 657         --unp_count;
 658         UNP_LIST_UNLOCK();
 659
 660         /*
 661          * XXXRW: Should assert vp->v_socket == so.
 662          */
 663         if ((vp = unp->unp_vnode) != NULL) {
 664                 VOP_UNP_DETACH(vp);
 665                 unp->unp_vnode = NULL;
 666         }
 667         unp2 = unp->unp_conn;
 668         if (unp2 != NULL) {
 669                 UNP_PCB_LOCK(unp2);
 670                 unp_disconnect(unp, unp2);
 671                 UNP_PCB_UNLOCK(unp2);
 672         }
 673
 674         /*
 675          * We hold the linkage lock exclusively, so it's OK to acquire
 676          * multiple pcb locks at a time.
 677          */
 678         while (!LIST_EMPTY(&unp->unp_refs)) {
 679                 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
 680
 681                 UNP_PCB_LOCK(ref);
 682                 unp_drop(ref, ECONNRESET);
 683                 UNP_PCB_UNLOCK(ref);
 684         }
 685         local_unp_rights = unp_rights;
 686         UNP_LINK_WUNLOCK();
 687         unp->unp_socket->so_pcb = NULL;
 688         saved_unp_addr = unp->unp_addr;
 689         unp->unp_addr = NULL;
 690         unp->unp_refcount--;
 691         freeunp = (unp->unp_refcount == 0);
 692         if (saved_unp_addr != NULL)
 693                 free(saved_unp_addr, M_SONAME);
 694         if (freeunp) {
 695                 UNP_PCB_LOCK_DESTROY(unp);
 696                 uma_zfree(unp_zone, unp);
 697         } else
 698                 UNP_PCB_UNLOCK(unp);
 699         if (vp)
 700                 vrele(vp);
 701         if (local_unp_rights)
 702                 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
 703 }
 704
 705 static int
 706 uipc_disconnect(struct socket *so)
 707 {
 708         struct unpcb *unp, *unp2;
 709
 710         unp = sotounpcb(so);
 711         KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
 712
 713         UNP_LINK_WLOCK();
 714         UNP_PCB_LOCK(unp);
 715         unp2 = unp->unp_conn;
 716         if (unp2 != NULL) {
 717                 UNP_PCB_LOCK(unp2);
 718                 unp_disconnect(unp, unp2);
 719                 UNP_PCB_UNLOCK(unp2);
 720         }
 721         UNP_PCB_UNLOCK(unp);
 722         UNP_LINK_WUNLOCK();
 723         return (0);
 724 }
 725
 726 static int
 727 uipc_listen(struct socket *so, int backlog, struct thread *td)
 728 {
 729         struct unpcb *unp;
 730         int error;
 731
 732         unp = sotounpcb(so);
 733         KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
 734
 735         UNP_PCB_LOCK(unp);
 736         if (unp->unp_vnode == NULL) {
 737                 UNP_PCB_UNLOCK(unp);
 738                 return (EINVAL);
 739         }
 740
 741         SOCK_LOCK(so);
 742         error = solisten_proto_check(so);
 743         if (error == 0) {
 744                 cru2x(td->td_ucred, &unp->unp_peercred);
 745                 unp->unp_flags |= UNP_HAVEPCCACHED;
 746                 solisten_proto(so, backlog);
 747         }
 748         SOCK_UNLOCK(so);
 749         UNP_PCB_UNLOCK(unp);
 750         return (error);
 751 }
 752
 753 static int
 754 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
 755 {
 756         struct unpcb *unp, *unp2;
 757         const struct sockaddr *sa;
 758
 759         unp = sotounpcb(so);
 760         KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
 761
 762         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 763         UNP_LINK_RLOCK();
 764         /*
 765          * XXX: It seems that this test always fails even when connection is
 766          * established.  So, this else clause is added as workaround to
 767          * return PF_LOCAL sockaddr.
 768          */
 769         unp2 = unp->unp_conn;
 770         if (unp2 != NULL) {
 771                 UNP_PCB_LOCK(unp2);
 772                 if (unp2->unp_addr != NULL)
 773                         sa = (struct sockaddr *) unp2->unp_addr;
 774                 else
 775                         sa = &sun_noname;
 776                 bcopy(sa, *nam, sa->sa_len);
 777                 UNP_PCB_UNLOCK(unp2);
 778         } else {
 779                 sa = &sun_noname;
 780                 bcopy(sa, *nam, sa->sa_len);
 781         }
 782         UNP_LINK_RUNLOCK();
 783         return (0);
 784 }
 785
 786 static int
 787 uipc_rcvd(struct socket *so, int flags)
 788 {
 789         struct unpcb *unp, *unp2;
 790         struct socket *so2;
 791         u_int mbcnt, sbcc;
 792         u_long newhiwat;
 793
 794         unp = sotounpcb(so);
 795         KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
 796
 797         if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
 798                 panic("uipc_rcvd socktype %d", so->so_type);
 799
 800         /*
 801          * Adjust backpressure on sender and wakeup any waiting to write.
 802          *
 803          * The unp lock is acquired to maintain the validity of the unp_conn
 804          * pointer; no lock on unp2 is required as unp2->unp_socket will be
 805          * static as long as we don't permit unp2 to disconnect from unp,
 806          * which is prevented by the lock on unp.  We cache values from
 807          * so_rcv to avoid holding the so_rcv lock over the entire
 808          * transaction on the remote so_snd.
 809          */
 810         SOCKBUF_LOCK(&so->so_rcv);
 811         mbcnt = so->so_rcv.sb_mbcnt;
 812         sbcc = so->so_rcv.sb_cc;
 813         SOCKBUF_UNLOCK(&so->so_rcv);
 814         UNP_PCB_LOCK(unp);
 815         unp2 = unp->unp_conn;
 816         if (unp2 == NULL) {
 817                 UNP_PCB_UNLOCK(unp);
 818                 return (0);
 819         }
 820         so2 = unp2->unp_socket;
 821         SOCKBUF_LOCK(&so2->so_snd);
 822         so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
 823         newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
 824         (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
 825             newhiwat, RLIM_INFINITY);
 826         sowwakeup_locked(so2);
 827         unp->unp_mbcnt = mbcnt;
 828         unp->unp_cc = sbcc;
 829         UNP_PCB_UNLOCK(unp);
 830         return (0);
 831 }
 832
 833 static int
 834 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 835     struct mbuf *control, struct thread *td)
 836 {
 837         struct unpcb *unp, *unp2;
 838         struct socket *so2;
 839         u_int mbcnt_delta, sbcc;
 840         u_int newhiwat;
 841         int error = 0;
 842
 843         unp = sotounpcb(so);
 844         KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
 845
 846         if (flags & PRUS_OOB) {
 847                 error = EOPNOTSUPP;
 848                 goto release;
 849         }
 850         if (control != NULL && (error = unp_internalize(&control, td)))
 851                 goto release;
 852         if ((nam != NULL) || (flags & PRUS_EOF))
 853                 UNP_LINK_WLOCK();
 854         else
 855                 UNP_LINK_RLOCK();
 856         switch (so->so_type) {
 857         case SOCK_DGRAM:
 858         {
 859                 const struct sockaddr *from;
 860
 861                 unp2 = unp->unp_conn;
 862                 if (nam != NULL) {
 863                         UNP_LINK_WLOCK_ASSERT();
 864                         if (unp2 != NULL) {
 865                                 error = EISCONN;
 866                                 break;
 867                         }
 868                         error = unp_connect(so, nam, td);
 869                         if (error)
 870                                 break;
 871                         unp2 = unp->unp_conn;
 872                 }
 873
 874                 /*
 875                  * Because connect() and send() are non-atomic in a sendto()
 876                  * with a target address, it's possible that the socket will
 877                  * have disconnected before the send() can run.  In that case
 878                  * return the slightly counter-intuitive but otherwise
 879                  * correct error that the socket is not connected.
 880                  */
 881                 if (unp2 == NULL) {
 882                         error = ENOTCONN;
 883                         break;
 884                 }
 885                 /* Lockless read. */
 886                 if (unp2->unp_flags & UNP_WANTCRED)
 887                         control = unp_addsockcred(td, control);
 888                 UNP_PCB_LOCK(unp);
 889                 if (unp->unp_addr != NULL)
 890                         from = (struct sockaddr *)unp->unp_addr;
 891                 else
 892                         from = &sun_noname;
 893                 so2 = unp2->unp_socket;
 894                 SOCKBUF_LOCK(&so2->so_rcv);
 895                 if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
 896                         sorwakeup_locked(so2);
 897                         m = NULL;
 898                         control = NULL;
 899                 } else {
 900                         SOCKBUF_UNLOCK(&so2->so_rcv);
 901                         error = ENOBUFS;
 902                 }
 903                 if (nam != NULL) {
 904                         UNP_LINK_WLOCK_ASSERT();
 905                         UNP_PCB_LOCK(unp2);
 906                         unp_disconnect(unp, unp2);
 907                         UNP_PCB_UNLOCK(unp2);
 908                 }
 909                 UNP_PCB_UNLOCK(unp);
 910                 break;
 911         }
 912
 913         case SOCK_SEQPACKET:
 914         case SOCK_STREAM:
 915                 if ((so->so_state & SS_ISCONNECTED) == 0) {
 916                         if (nam != NULL) {
 917                                 UNP_LINK_WLOCK_ASSERT();
 918                                 error = unp_connect(so, nam, td);
 919                                 if (error)
 920                                         break;  /* XXX */
 921                         } else {
 922                                 error = ENOTCONN;
 923                                 break;
 924                         }
 925                 }
 926
 927                 /* Lockless read. */
 928                 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
 929                         error = EPIPE;
 930                         break;
 931                 }
 932
 933                 /*
 934                  * Because connect() and send() are non-atomic in a sendto()
 935                  * with a target address, it's possible that the socket will
 936                  * have disconnected before the send() can run.  In that case
 937                  * return the slightly counter-intuitive but otherwise
 938                  * correct error that the socket is not connected.
 939                  *
 940                  * Locking here must be done carefully: the linkage lock
 941                  * prevents interconnections between unpcbs from changing, so
 942                  * we can traverse from unp to unp2 without acquiring unp's
 943                  * lock.  Socket buffer locks follow unpcb locks, so we can
 944                  * acquire both remote and lock socket buffer locks.
 945                  */
 946                 unp2 = unp->unp_conn;
 947                 if (unp2 == NULL) {
 948                         error = ENOTCONN;
 949                         break;
 950                 }
 951                 so2 = unp2->unp_socket;
 952                 UNP_PCB_LOCK(unp2);
 953                 SOCKBUF_LOCK(&so2->so_rcv);
 954                 if (unp2->unp_flags & UNP_WANTCRED) {
 955                         /*
 956                          * Credentials are passed only once on SOCK_STREAM
 957                          * and SOCK_SEQPACKET.
 958                          */
 959                         unp2->unp_flags &= ~UNP_WANTCRED;
 960                         control = unp_addsockcred(td, control);
 961                 }
 962                 /*
 963                  * Send to paired receive port, and then reduce send buffer
 964                  * hiwater marks to maintain backpressure.  Wake up readers.
 965                  */
 966                 switch (so->so_type) {
 967                 case SOCK_STREAM:
 968                         if (control != NULL) {
 969                                 if (sbappendcontrol_locked(&so2->so_rcv, m,
 970                                     control))
 971                                         control = NULL;
 972                         } else
 973                                 sbappend_locked(&so2->so_rcv, m);
 974                         break;
 975
 976                 case SOCK_SEQPACKET: {
 977                         const struct sockaddr *from;
 978
 979                         from = &sun_noname;
 980                         if (sbappendaddr_locked(&so2->so_rcv, from, m,
 981                             control))
 982                                 control = NULL;
 983                         break;
 984                         }
 985                 }
 986
 987                 /*
 988                  * XXXRW: While fine for SOCK_STREAM, this conflates maximum
 989                  * datagram size and back-pressure for SOCK_SEQPACKET, which
 990                  * can lead to undesired return of EMSGSIZE on send instead
 991                  * of more desirable blocking.
 992                  */
 993                 mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
 994                 unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
 995                 sbcc = so2->so_rcv.sb_cc;
 996                 sorwakeup_locked(so2);
 997
 998                 SOCKBUF_LOCK(&so->so_snd);
 999                 if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
1000                         newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
1001                 else
1002                         newhiwat = 0;
1003                 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
1004                     newhiwat, RLIM_INFINITY);
1005                 so->so_snd.sb_mbmax -= mbcnt_delta;
1006                 SOCKBUF_UNLOCK(&so->so_snd);
1007                 unp2->unp_cc = sbcc;
1008                 UNP_PCB_UNLOCK(unp2);
1009                 m = NULL;
1010                 break;
1011
1012         default:
1013                 panic("uipc_send unknown socktype");
1014         }
1015
1016         /*
1017          * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1018          */
1019         if (flags & PRUS_EOF) {
1020                 UNP_PCB_LOCK(unp);
1021                 socantsendmore(so);
1022                 unp_shutdown(unp);
1023                 UNP_PCB_UNLOCK(unp);
1024         }
1025
1026         if ((nam != NULL) || (flags & PRUS_EOF))
1027                 UNP_LINK_WUNLOCK();
1028         else
1029                 UNP_LINK_RUNLOCK();
1030
1031         if (control != NULL && error != 0)
1032                 unp_dispose(control);
1033
1034 release:
1035         if (control != NULL)
1036                 m_freem(control);
1037         if (m != NULL)
1038                 m_freem(m);
1039         return (error);
1040 }
1041
1042 static int
1043 uipc_sense(struct socket *so, struct stat *sb)
1044 {
1045         struct unpcb *unp, *unp2;
1046         struct socket *so2;
1047
1048         unp = sotounpcb(so);
1049         KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1050
1051         sb->st_blksize = so->so_snd.sb_hiwat;
1052         UNP_LINK_RLOCK();
1053         UNP_PCB_LOCK(unp);
1054         unp2 = unp->unp_conn;
1055         if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
1056             unp2 != NULL) {
1057                 so2 = unp2->unp_socket;
1058                 sb->st_blksize += so2->so_rcv.sb_cc;
1059         }
1060         sb->st_dev = NODEV;
1061         if (unp->unp_ino == 0)
1062                 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1063         sb->st_ino = unp->unp_ino;
1064         UNP_PCB_UNLOCK(unp);
1065         UNP_LINK_RUNLOCK();
1066         return (0);
1067 }
1068
1069 static int
1070 uipc_shutdown(struct socket *so)
1071 {
1072         struct unpcb *unp;
1073
1074         unp = sotounpcb(so);
1075         KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1076
1077         UNP_LINK_WLOCK();
1078         UNP_PCB_LOCK(unp);
1079         socantsendmore(so);
1080         unp_shutdown(unp);
1081         UNP_PCB_UNLOCK(unp);
1082         UNP_LINK_WUNLOCK();
1083         return (0);
1084 }
1085
1086 static int
1087 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1088 {
1089         struct unpcb *unp;
1090         const struct sockaddr *sa;
1091
1092         unp = sotounpcb(so);
1093         KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1094
1095         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1096         UNP_PCB_LOCK(unp);
1097         if (unp->unp_addr != NULL)
1098                 sa = (struct sockaddr *) unp->unp_addr;
1099         else
1100                 sa = &sun_noname;
1101         bcopy(sa, *nam, sa->sa_len);
1102         UNP_PCB_UNLOCK(unp);
1103         return (0);
1104 }
1105
1106 static struct pr_usrreqs uipc_usrreqs_dgram = {
1107         .pru_abort =            uipc_abort,
1108         .pru_accept =           uipc_accept,
1109         .pru_attach =           uipc_attach,
1110         .pru_bind =             uipc_bind,
1111         .pru_bindat =           uipc_bindat,
1112         .pru_connect =          uipc_connect,
1113         .pru_connectat =        uipc_connectat,
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_dgram,
1125         .pru_close =            uipc_close,
1126 };
1127
1128 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1129         .pru_abort =            uipc_abort,
1130         .pru_accept =           uipc_accept,
1131         .pru_attach =           uipc_attach,
1132         .pru_bind =             uipc_bind,
1133         .pru_bindat =           uipc_bindat,
1134         .pru_connect =          uipc_connect,
1135         .pru_connectat =        uipc_connectat,
1136         .pru_connect2 =         uipc_connect2,
1137         .pru_detach =           uipc_detach,
1138         .pru_disconnect =       uipc_disconnect,
1139         .pru_listen =           uipc_listen,
1140         .pru_peeraddr =         uipc_peeraddr,
1141         .pru_rcvd =             uipc_rcvd,
1142         .pru_send =             uipc_send,
1143         .pru_sense =            uipc_sense,
1144         .pru_shutdown =         uipc_shutdown,
1145         .pru_sockaddr =         uipc_sockaddr,
1146         .pru_soreceive =        soreceive_generic,      /* XXX: or...? */
1147         .pru_close =            uipc_close,
1148 };
1149
1150 static struct pr_usrreqs uipc_usrreqs_stream = {
1151         .pru_abort =            uipc_abort,
1152         .pru_accept =           uipc_accept,
1153         .pru_attach =           uipc_attach,
1154         .pru_bind =             uipc_bind,
1155         .pru_bindat =           uipc_bindat,
1156         .pru_connect =          uipc_connect,
1157         .pru_connectat =        uipc_connectat,
1158         .pru_connect2 =         uipc_connect2,
1159         .pru_detach =           uipc_detach,
1160         .pru_disconnect =       uipc_disconnect,
1161         .pru_listen =           uipc_listen,
1162         .pru_peeraddr =         uipc_peeraddr,
1163         .pru_rcvd =             uipc_rcvd,
1164         .pru_send =             uipc_send,
1165         .pru_sense =            uipc_sense,
1166         .pru_shutdown =         uipc_shutdown,
1167         .pru_sockaddr =         uipc_sockaddr,
1168         .pru_soreceive =        soreceive_generic,
1169         .pru_close =            uipc_close,
1170 };
1171
1172 static int
1173 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1174 {
1175         struct unpcb *unp;
1176         struct xucred xu;
1177         int error, optval;
1178
1179         if (sopt->sopt_level != 0)
1180                 return (EINVAL);
1181
1182         unp = sotounpcb(so);
1183         KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1184         error = 0;
1185         switch (sopt->sopt_dir) {
1186         case SOPT_GET:
1187                 switch (sopt->sopt_name) {
1188                 case LOCAL_PEERCRED:
1189                         UNP_PCB_LOCK(unp);
1190                         if (unp->unp_flags & UNP_HAVEPC)
1191                                 xu = unp->unp_peercred;
1192                         else {
1193                                 if (so->so_type == SOCK_STREAM)
1194                                         error = ENOTCONN;
1195                                 else
1196                                         error = EINVAL;
1197                         }
1198                         UNP_PCB_UNLOCK(unp);
1199                         if (error == 0)
1200                                 error = sooptcopyout(sopt, &xu, sizeof(xu));
1201                         break;
1202
1203                 case LOCAL_CREDS:
1204                         /* Unlocked read. */
1205                         optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1206                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1207                         break;
1208
1209                 case LOCAL_CONNWAIT:
1210                         /* Unlocked read. */
1211                         optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1212                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1213                         break;
1214
1215                 default:
1216                         error = EOPNOTSUPP;
1217                         break;
1218                 }
1219                 break;
1220
1221         case SOPT_SET:
1222                 switch (sopt->sopt_name) {
1223                 case LOCAL_CREDS:
1224                 case LOCAL_CONNWAIT:
1225                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1226                                             sizeof(optval));
1227                         if (error)
1228                                 break;
1229
1230 #define OPTSET(bit) do {                                                \
1231         UNP_PCB_LOCK(unp);                                              \
1232         if (optval)                                                     \
1233                 unp->unp_flags |= bit;                                  \
1234         else                                                            \
1235                 unp->unp_flags &= ~bit;                                 \
1236         UNP_PCB_UNLOCK(unp);                                            \
1237 } while (0)
1238
1239                         switch (sopt->sopt_name) {
1240                         case LOCAL_CREDS:
1241                                 OPTSET(UNP_WANTCRED);
1242                                 break;
1243
1244                         case LOCAL_CONNWAIT:
1245                                 OPTSET(UNP_CONNWAIT);
1246                                 break;
1247
1248                         default:
1249                                 break;
1250                         }
1251                         break;
1252 #undef  OPTSET
1253                 default:
1254                         error = ENOPROTOOPT;
1255                         break;
1256                 }
1257                 break;
1258
1259         default:
1260                 error = EOPNOTSUPP;
1261                 break;
1262         }
1263         return (error);
1264 }
1265
1266 static int
1267 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1268 {
1269
1270         return (unp_connectat(AT_FDCWD, so, nam, td));
1271 }
1272
1273 static int
1274 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1275     struct thread *td)
1276 {
1277         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1278         struct vnode *vp;
1279         struct socket *so2, *so3;
1280         struct unpcb *unp, *unp2, *unp3;
1281         struct nameidata nd;
1282         char buf[SOCK_MAXADDRLEN];
1283         struct sockaddr *sa;
1284         cap_rights_t rights;
1285         int error, len;
1286
1287         UNP_LINK_WLOCK_ASSERT();
1288
1289         unp = sotounpcb(so);
1290         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1291
1292         if (nam->sa_len > sizeof(struct sockaddr_un))
1293                 return (EINVAL);
1294         len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1295         if (len <= 0)
1296                 return (EINVAL);
1297         bcopy(soun->sun_path, buf, len);
1298         buf[len] = 0;
1299
1300         UNP_PCB_LOCK(unp);
1301         if (unp->unp_flags & UNP_CONNECTING) {
1302                 UNP_PCB_UNLOCK(unp);
1303                 return (EALREADY);
1304         }
1305         UNP_LINK_WUNLOCK();
1306         unp->unp_flags |= UNP_CONNECTING;
1307         UNP_PCB_UNLOCK(unp);
1308
1309         sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1310         NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1311             UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1312         error = namei(&nd);
1313         if (error)
1314                 vp = NULL;
1315         else
1316                 vp = nd.ni_vp;
1317         ASSERT_VOP_LOCKED(vp, "unp_connect");
1318         NDFREE(&nd, NDF_ONLY_PNBUF);
1319         if (error)
1320                 goto bad;
1321
1322         if (vp->v_type != VSOCK) {
1323                 error = ENOTSOCK;
1324                 goto bad;
1325         }
1326 #ifdef MAC
1327         error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1328         if (error)
1329                 goto bad;
1330 #endif
1331         error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1332         if (error)
1333                 goto bad;
1334
1335         unp = sotounpcb(so);
1336         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1337
1338         /*
1339          * Lock linkage lock for two reasons: make sure v_socket is stable,
1340          * and to protect simultaneous locking of multiple pcbs.
1341          */
1342         UNP_LINK_WLOCK();
1343         VOP_UNP_CONNECT(vp, &so2);
1344         if (so2 == NULL) {
1345                 error = ECONNREFUSED;
1346                 goto bad2;
1347         }
1348         if (so->so_type != so2->so_type) {
1349                 error = EPROTOTYPE;
1350                 goto bad2;
1351         }
1352         if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1353                 if (so2->so_options & SO_ACCEPTCONN) {
1354                         CURVNET_SET(so2->so_vnet);
1355                         so3 = sonewconn(so2, 0);
1356                         CURVNET_RESTORE();
1357                 } else
1358                         so3 = NULL;
1359                 if (so3 == NULL) {
1360                         error = ECONNREFUSED;
1361                         goto bad2;
1362                 }
1363                 unp = sotounpcb(so);
1364                 unp2 = sotounpcb(so2);
1365                 unp3 = sotounpcb(so3);
1366                 UNP_PCB_LOCK(unp);
1367                 UNP_PCB_LOCK(unp2);
1368                 UNP_PCB_LOCK(unp3);
1369                 if (unp2->unp_addr != NULL) {
1370                         bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1371                         unp3->unp_addr = (struct sockaddr_un *) sa;
1372                         sa = NULL;
1373                 }
1374
1375                 /*
1376                  * The connector's (client's) credentials are copied from its
1377                  * process structure at the time of connect() (which is now).
1378                  */
1379                 cru2x(td->td_ucred, &unp3->unp_peercred);
1380                 unp3->unp_flags |= UNP_HAVEPC;
1381
1382                 /*
1383                  * The receiver's (server's) credentials are copied from the
1384                  * unp_peercred member of socket on which the former called
1385                  * listen(); uipc_listen() cached that process's credentials
1386                  * at that time so we can use them now.
1387                  */
1388                 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1389                     ("unp_connect: listener without cached peercred"));
1390                 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1391                     sizeof(unp->unp_peercred));
1392                 unp->unp_flags |= UNP_HAVEPC;
1393                 if (unp2->unp_flags & UNP_WANTCRED)
1394                         unp3->unp_flags |= UNP_WANTCRED;
1395                 UNP_PCB_UNLOCK(unp3);
1396                 UNP_PCB_UNLOCK(unp2);
1397                 UNP_PCB_UNLOCK(unp);
1398 #ifdef MAC
1399                 mac_socketpeer_set_from_socket(so, so3);
1400                 mac_socketpeer_set_from_socket(so3, so);
1401 #endif
1402
1403                 so2 = so3;
1404         }
1405         unp = sotounpcb(so);
1406         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1407         unp2 = sotounpcb(so2);
1408         KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1409         UNP_PCB_LOCK(unp);
1410         UNP_PCB_LOCK(unp2);
1411         error = unp_connect2(so, so2, PRU_CONNECT);
1412         UNP_PCB_UNLOCK(unp2);
1413         UNP_PCB_UNLOCK(unp);
1414 bad2:
1415         UNP_LINK_WUNLOCK();
1416 bad:
1417         if (vp != NULL)
1418                 vput(vp);
1419         free(sa, M_SONAME);
1420         UNP_LINK_WLOCK();
1421         UNP_PCB_LOCK(unp);
1422         unp->unp_flags &= ~UNP_CONNECTING;
1423         UNP_PCB_UNLOCK(unp);
1424         return (error);
1425 }
1426
1427 static int
1428 unp_connect2(struct socket *so, struct socket *so2, int req)
1429 {
1430         struct unpcb *unp;
1431         struct unpcb *unp2;
1432
1433         unp = sotounpcb(so);
1434         KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1435         unp2 = sotounpcb(so2);
1436         KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1437
1438         UNP_LINK_WLOCK_ASSERT();
1439         UNP_PCB_LOCK_ASSERT(unp);
1440         UNP_PCB_LOCK_ASSERT(unp2);
1441
1442         if (so2->so_type != so->so_type)
1443                 return (EPROTOTYPE);
1444         unp->unp_conn = unp2;
1445
1446         switch (so->so_type) {
1447         case SOCK_DGRAM:
1448                 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1449                 soisconnected(so);
1450                 break;
1451
1452         case SOCK_STREAM:
1453         case SOCK_SEQPACKET:
1454                 unp2->unp_conn = unp;
1455                 if (req == PRU_CONNECT &&
1456                     ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1457                         soisconnecting(so);
1458                 else
1459                         soisconnected(so);
1460                 soisconnected(so2);
1461                 break;
1462
1463         default:
1464                 panic("unp_connect2");
1465         }
1466         return (0);
1467 }
1468
1469 static void
1470 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1471 {
1472         struct socket *so;
1473
1474         KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1475
1476         UNP_LINK_WLOCK_ASSERT();
1477         UNP_PCB_LOCK_ASSERT(unp);
1478         UNP_PCB_LOCK_ASSERT(unp2);
1479
1480         unp->unp_conn = NULL;
1481         switch (unp->unp_socket->so_type) {
1482         case SOCK_DGRAM:
1483                 LIST_REMOVE(unp, unp_reflink);
1484                 so = unp->unp_socket;
1485                 SOCK_LOCK(so);
1486                 so->so_state &= ~SS_ISCONNECTED;
1487                 SOCK_UNLOCK(so);
1488                 break;
1489
1490         case SOCK_STREAM:
1491         case SOCK_SEQPACKET:
1492                 soisdisconnected(unp->unp_socket);
1493                 unp2->unp_conn = NULL;
1494                 soisdisconnected(unp2->unp_socket);
1495                 break;
1496         }
1497 }
1498
1499 /*
1500  * unp_pcblist() walks the global list of struct unpcb's to generate a
1501  * pointer list, bumping the refcount on each unpcb.  It then copies them out
1502  * sequentially, validating the generation number on each to see if it has
1503  * been detached.  All of this is necessary because copyout() may sleep on
1504  * disk I/O.
1505  */
1506 static int
1507 unp_pcblist(SYSCTL_HANDLER_ARGS)
1508 {
1509         int error, i, n;
1510         int freeunp;
1511         struct unpcb *unp, **unp_list;
1512         unp_gen_t gencnt;
1513         struct xunpgen *xug;
1514         struct unp_head *head;
1515         struct xunpcb *xu;
1516
1517         switch ((intptr_t)arg1) {
1518         case SOCK_STREAM:
1519                 head = &unp_shead;
1520                 break;
1521
1522         case SOCK_DGRAM:
1523                 head = &unp_dhead;
1524                 break;
1525
1526         case SOCK_SEQPACKET:
1527                 head = &unp_sphead;
1528                 break;
1529
1530         default:
1531                 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1532         }
1533
1534         /*
1535          * The process of preparing the PCB list is too time-consuming and
1536          * resource-intensive to repeat twice on every request.
1537          */
1538         if (req->oldptr == NULL) {
1539                 n = unp_count;
1540                 req->oldidx = 2 * (sizeof *xug)
1541                         + (n + n/8) * sizeof(struct xunpcb);
1542                 return (0);
1543         }
1544
1545         if (req->newptr != NULL)
1546                 return (EPERM);
1547
1548         /*
1549          * OK, now we're committed to doing something.
1550          */
1551         xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1552         UNP_LIST_LOCK();
1553         gencnt = unp_gencnt;
1554         n = unp_count;
1555         UNP_LIST_UNLOCK();
1556
1557         xug->xug_len = sizeof *xug;
1558         xug->xug_count = n;
1559         xug->xug_gen = gencnt;
1560         xug->xug_sogen = so_gencnt;
1561         error = SYSCTL_OUT(req, xug, sizeof *xug);
1562         if (error) {
1563                 free(xug, M_TEMP);
1564                 return (error);
1565         }
1566
1567         unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1568
1569         UNP_LIST_LOCK();
1570         for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1571              unp = LIST_NEXT(unp, unp_link)) {
1572                 UNP_PCB_LOCK(unp);
1573                 if (unp->unp_gencnt <= gencnt) {
1574                         if (cr_cansee(req->td->td_ucred,
1575                             unp->unp_socket->so_cred)) {
1576                                 UNP_PCB_UNLOCK(unp);
1577                                 continue;
1578                         }
1579                         unp_list[i++] = unp;
1580                         unp->unp_refcount++;
1581                 }
1582                 UNP_PCB_UNLOCK(unp);
1583         }
1584         UNP_LIST_UNLOCK();
1585         n = i;                  /* In case we lost some during malloc. */
1586
1587         error = 0;
1588         xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1589         for (i = 0; i < n; i++) {
1590                 unp = unp_list[i];
1591                 UNP_PCB_LOCK(unp);
1592                 unp->unp_refcount--;
1593                 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1594                         xu->xu_len = sizeof *xu;
1595                         xu->xu_unpp = unp;
1596                         /*
1597                          * XXX - need more locking here to protect against
1598                          * connect/disconnect races for SMP.
1599                          */
1600                         if (unp->unp_addr != NULL)
1601                                 bcopy(unp->unp_addr, &xu->xu_addr,
1602                                       unp->unp_addr->sun_len);
1603                         if (unp->unp_conn != NULL &&
1604                             unp->unp_conn->unp_addr != NULL)
1605                                 bcopy(unp->unp_conn->unp_addr,
1606                                       &xu->xu_caddr,
1607                                       unp->unp_conn->unp_addr->sun_len);
1608                         bcopy(unp, &xu->xu_unp, sizeof *unp);
1609                         sotoxsocket(unp->unp_socket, &xu->xu_socket);
1610                         UNP_PCB_UNLOCK(unp);
1611                         error = SYSCTL_OUT(req, xu, sizeof *xu);
1612                 } else {
1613                         freeunp = (unp->unp_refcount == 0);
1614                         UNP_PCB_UNLOCK(unp);
1615                         if (freeunp) {
1616                                 UNP_PCB_LOCK_DESTROY(unp);
1617                                 uma_zfree(unp_zone, unp);
1618                         }
1619                 }
1620         }
1621         free(xu, M_TEMP);
1622         if (!error) {
1623                 /*
1624                  * Give the user an updated idea of our state.  If the
1625                  * generation differs from what we told her before, she knows
1626                  * that something happened while we were processing this
1627                  * request, and it might be necessary to retry.
1628                  */
1629                 xug->xug_gen = unp_gencnt;
1630                 xug->xug_sogen = so_gencnt;
1631                 xug->xug_count = unp_count;
1632                 error = SYSCTL_OUT(req, xug, sizeof *xug);
1633         }
1634         free(unp_list, M_TEMP);
1635         free(xug, M_TEMP);
1636         return (error);
1637 }
1638
1639 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1640     (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1641     "List of active local datagram sockets");
1642 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1643     (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1644     "List of active local stream sockets");
1645 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1646     CTLTYPE_OPAQUE | CTLFLAG_RD,
1647     (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1648     "List of active local seqpacket sockets");
1649
1650 static void
1651 unp_shutdown(struct unpcb *unp)
1652 {
1653         struct unpcb *unp2;
1654         struct socket *so;
1655
1656         UNP_LINK_WLOCK_ASSERT();
1657         UNP_PCB_LOCK_ASSERT(unp);
1658
1659         unp2 = unp->unp_conn;
1660         if ((unp->unp_socket->so_type == SOCK_STREAM ||
1661             (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1662                 so = unp2->unp_socket;
1663                 if (so != NULL)
1664                         socantrcvmore(so);
1665         }
1666 }
1667
1668 static void
1669 unp_drop(struct unpcb *unp, int errno)
1670 {
1671         struct socket *so = unp->unp_socket;
1672         struct unpcb *unp2;
1673
1674         UNP_LINK_WLOCK_ASSERT();
1675         UNP_PCB_LOCK_ASSERT(unp);
1676
1677         so->so_error = errno;
1678         unp2 = unp->unp_conn;
1679         if (unp2 == NULL)
1680                 return;
1681         UNP_PCB_LOCK(unp2);
1682         unp_disconnect(unp, unp2);
1683         UNP_PCB_UNLOCK(unp2);
1684 }
1685
1686 static void
1687 unp_freerights(struct filedescent **fdep, int fdcount)
1688 {
1689         struct file *fp;
1690         int i;
1691
1692         KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1693
1694         for (i = 0; i < fdcount; i++) {
1695                 fp = fdep[i]->fde_file;
1696                 filecaps_free(&fdep[i]->fde_caps);
1697                 unp_discard(fp);
1698         }
1699         free(fdep[0], M_FILECAPS);
1700 }
1701
1702 static int
1703 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1704 {
1705         struct thread *td = curthread;          /* XXX */
1706         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1707         int i;
1708         int *fdp;
1709         struct filedesc *fdesc = td->td_proc->p_fd;
1710         struct filedescent *fde, **fdep;
1711         void *data;
1712         socklen_t clen = control->m_len, datalen;
1713         int error, newfds;
1714         u_int newlen;
1715
1716         UNP_LINK_UNLOCK_ASSERT();
1717
1718         error = 0;
1719         if (controlp != NULL) /* controlp == NULL => free control messages */
1720                 *controlp = NULL;
1721         while (cm != NULL) {
1722                 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1723                         error = EINVAL;
1724                         break;
1725                 }
1726                 data = CMSG_DATA(cm);
1727                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1728                 if (cm->cmsg_level == SOL_SOCKET
1729                     && cm->cmsg_type == SCM_RIGHTS) {
1730                         newfds = datalen / sizeof(*fdep);
1731                         if (newfds == 0)
1732                                 goto next;
1733                         fdep = data;
1734
1735                         /* If we're not outputting the descriptors free them. */
1736                         if (error || controlp == NULL) {
1737                                 unp_freerights(fdep, newfds);
1738                                 goto next;
1739                         }
1740                         FILEDESC_XLOCK(fdesc);
1741
1742                         /*
1743                          * Now change each pointer to an fd in the global
1744                          * table to an integer that is the index to the local
1745                          * fd table entry that we set up to point to the
1746                          * global one we are transferring.
1747                          */
1748                         newlen = newfds * sizeof(int);
1749                         *controlp = sbcreatecontrol(NULL, newlen,
1750                             SCM_RIGHTS, SOL_SOCKET);
1751                         if (*controlp == NULL) {
1752                                 FILEDESC_XUNLOCK(fdesc);
1753                                 error = E2BIG;
1754                                 unp_freerights(fdep, newfds);
1755                                 goto next;
1756                         }
1757
1758                         fdp = (int *)
1759                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1760                         if (fdallocn(td, 0, fdp, newfds) != 0) {
1761                                 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1762                                 error = EMSGSIZE;
1763                                 unp_freerights(fdep, newfds);
1764                                 m_freem(*controlp);
1765                                 *controlp = NULL;
1766                                 goto next;
1767                         }
1768                         for (i = 0; i < newfds; i++, fdp++) {
1769                                 fde = &fdesc->fd_ofiles[*fdp];
1770                                 fde->fde_file = fdep[i]->fde_file;
1771                                 filecaps_move(&fdep[i]->fde_caps,
1772                                     &fde->fde_caps);
1773                                 if ((flags & MSG_CMSG_CLOEXEC) != 0)
1774                                         fde->fde_flags |= UF_EXCLOSE;
1775                                 unp_externalize_fp(fde->fde_file);
1776                         }
1777                         FILEDESC_XUNLOCK(fdesc);
1778                         free(fdep[0], M_FILECAPS);
1779                 } else {
1780                         /* We can just copy anything else across. */
1781                         if (error || controlp == NULL)
1782                                 goto next;
1783                         *controlp = sbcreatecontrol(NULL, datalen,
1784                             cm->cmsg_type, cm->cmsg_level);
1785                         if (*controlp == NULL) {
1786                                 error = ENOBUFS;
1787                                 goto next;
1788                         }
1789                         bcopy(data,
1790                             CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1791                             datalen);
1792                 }
1793                 controlp = &(*controlp)->m_next;
1794
1795 next:
1796                 if (CMSG_SPACE(datalen) < clen) {
1797                         clen -= CMSG_SPACE(datalen);
1798                         cm = (struct cmsghdr *)
1799                             ((caddr_t)cm + CMSG_SPACE(datalen));
1800                 } else {
1801                         clen = 0;
1802                         cm = NULL;
1803                 }
1804         }
1805
1806         m_freem(control);
1807         return (error);
1808 }
1809
1810 static void
1811 unp_zone_change(void *tag)
1812 {
1813
1814         uma_zone_set_max(unp_zone, maxsockets);
1815 }
1816
1817 static void
1818 unp_init(void)
1819 {
1820
1821 #ifdef VIMAGE
1822         if (!IS_DEFAULT_VNET(curvnet))
1823                 return;
1824 #endif
1825         unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1826             NULL, NULL, UMA_ALIGN_PTR, 0);
1827         if (unp_zone == NULL)
1828                 panic("unp_init");
1829         uma_zone_set_max(unp_zone, maxsockets);
1830         uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1831         EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1832             NULL, EVENTHANDLER_PRI_ANY);
1833         LIST_INIT(&unp_dhead);
1834         LIST_INIT(&unp_shead);
1835         LIST_INIT(&unp_sphead);
1836         SLIST_INIT(&unp_defers);
1837         TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1838         TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1839         UNP_LINK_LOCK_INIT();
1840         UNP_LIST_LOCK_INIT();
1841         UNP_DEFERRED_LOCK_INIT();
1842 }
1843
1844 static int
1845 unp_internalize(struct mbuf **controlp, struct thread *td)
1846 {
1847         struct mbuf *control = *controlp;
1848         struct proc *p = td->td_proc;
1849         struct filedesc *fdesc = p->p_fd;
1850         struct bintime *bt;
1851         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1852         struct cmsgcred *cmcred;
1853         struct filedescent *fde, **fdep, *fdev;
1854         struct file *fp;
1855         struct timeval *tv;
1856         int i, fd, *fdp;
1857         void *data;
1858         socklen_t clen = control->m_len, datalen;
1859         int error, oldfds;
1860         u_int newlen;
1861
1862         UNP_LINK_UNLOCK_ASSERT();
1863
1864         error = 0;
1865         *controlp = NULL;
1866         while (cm != NULL) {
1867                 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1868                     || cm->cmsg_len > clen) {
1869                         error = EINVAL;
1870                         goto out;
1871                 }
1872                 data = CMSG_DATA(cm);
1873                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1874
1875                 switch (cm->cmsg_type) {
1876                 /*
1877                  * Fill in credential information.
1878                  */
1879                 case SCM_CREDS:
1880                         *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1881                             SCM_CREDS, SOL_SOCKET);
1882                         if (*controlp == NULL) {
1883                                 error = ENOBUFS;
1884                                 goto out;
1885                         }
1886                         cmcred = (struct cmsgcred *)
1887                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1888                         cmcred->cmcred_pid = p->p_pid;
1889                         cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1890                         cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1891                         cmcred->cmcred_euid = td->td_ucred->cr_uid;
1892                         cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1893                             CMGROUP_MAX);
1894                         for (i = 0; i < cmcred->cmcred_ngroups; i++)
1895                                 cmcred->cmcred_groups[i] =
1896                                     td->td_ucred->cr_groups[i];
1897                         break;
1898
1899                 case SCM_RIGHTS:
1900                         oldfds = datalen / sizeof (int);
1901                         if (oldfds == 0)
1902                                 break;
1903                         /*
1904                          * Check that all the FDs passed in refer to legal
1905                          * files.  If not, reject the entire operation.
1906                          */
1907                         fdp = data;
1908                         FILEDESC_SLOCK(fdesc);
1909                         for (i = 0; i < oldfds; i++) {
1910                                 fd = *fdp++;
1911                                 if (fget_locked(fdesc, fd) == NULL) {
1912                                         FILEDESC_SUNLOCK(fdesc);
1913                                         error = EBADF;
1914                                         goto out;
1915                                 }
1916                                 fp = fdesc->fd_ofiles[fd].fde_file;
1917                                 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1918                                         FILEDESC_SUNLOCK(fdesc);
1919                                         error = EOPNOTSUPP;
1920                                         goto out;
1921                                 }
1922
1923                         }
1924
1925                         /*
1926                          * Now replace the integer FDs with pointers to the
1927                          * file structure and capability rights.
1928                          */
1929                         newlen = oldfds * sizeof(fdep[0]);
1930                         *controlp = sbcreatecontrol(NULL, newlen,
1931                             SCM_RIGHTS, SOL_SOCKET);
1932                         if (*controlp == NULL) {
1933                                 FILEDESC_SUNLOCK(fdesc);
1934                                 error = E2BIG;
1935                                 goto out;
1936                         }
1937                         fdp = data;
1938                         fdep = (struct filedescent **)
1939                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1940                         fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1941                             M_WAITOK);
1942                         for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1943                                 fde = &fdesc->fd_ofiles[*fdp];
1944                                 fdep[i] = fdev;
1945                                 fdep[i]->fde_file = fde->fde_file;
1946                                 filecaps_copy(&fde->fde_caps,
1947                                     &fdep[i]->fde_caps);
1948                                 unp_internalize_fp(fdep[i]->fde_file);
1949                         }
1950                         FILEDESC_SUNLOCK(fdesc);
1951                         break;
1952
1953                 case SCM_TIMESTAMP:
1954                         *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1955                             SCM_TIMESTAMP, SOL_SOCKET);
1956                         if (*controlp == NULL) {
1957                                 error = ENOBUFS;
1958                                 goto out;
1959                         }
1960                         tv = (struct timeval *)
1961                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1962                         microtime(tv);
1963                         break;
1964
1965                 case SCM_BINTIME:
1966                         *controlp = sbcreatecontrol(NULL, sizeof(*bt),
1967                             SCM_BINTIME, SOL_SOCKET);
1968                         if (*controlp == NULL) {
1969                                 error = ENOBUFS;
1970                                 goto out;
1971                         }
1972                         bt = (struct bintime *)
1973                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1974                         bintime(bt);
1975                         break;
1976
1977                 default:
1978                         error = EINVAL;
1979                         goto out;
1980                 }
1981
1982                 controlp = &(*controlp)->m_next;
1983                 if (CMSG_SPACE(datalen) < clen) {
1984                         clen -= CMSG_SPACE(datalen);
1985                         cm = (struct cmsghdr *)
1986                             ((caddr_t)cm + CMSG_SPACE(datalen));
1987                 } else {
1988                         clen = 0;
1989                         cm = NULL;
1990                 }
1991         }
1992
1993 out:
1994         m_freem(control);
1995         return (error);
1996 }
1997
1998 static struct mbuf *
1999 unp_addsockcred(struct thread *td, struct mbuf *control)
2000 {
2001         struct mbuf *m, *n, *n_prev;
2002         struct sockcred *sc;
2003         const struct cmsghdr *cm;
2004         int ngroups;
2005         int i;
2006
2007         ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2008         m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2009         if (m == NULL)
2010                 return (control);
2011
2012         sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2013         sc->sc_uid = td->td_ucred->cr_ruid;
2014         sc->sc_euid = td->td_ucred->cr_uid;
2015         sc->sc_gid = td->td_ucred->cr_rgid;
2016         sc->sc_egid = td->td_ucred->cr_gid;
2017         sc->sc_ngroups = ngroups;
2018         for (i = 0; i < sc->sc_ngroups; i++)
2019                 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2020
2021         /*
2022          * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2023          * created SCM_CREDS control message (struct sockcred) has another
2024          * format.
2025          */
2026         if (control != NULL)
2027                 for (n = control, n_prev = NULL; n != NULL;) {
2028                         cm = mtod(n, struct cmsghdr *);
2029                         if (cm->cmsg_level == SOL_SOCKET &&
2030                             cm->cmsg_type == SCM_CREDS) {
2031                                 if (n_prev == NULL)
2032                                         control = n->m_next;
2033                                 else
2034                                         n_prev->m_next = n->m_next;
2035                                 n = m_free(n);
2036                         } else {
2037                                 n_prev = n;
2038                                 n = n->m_next;
2039                         }
2040                 }
2041
2042         /* Prepend it to the head. */
2043         m->m_next = control;
2044         return (m);
2045 }
2046
2047 static struct unpcb *
2048 fptounp(struct file *fp)
2049 {
2050         struct socket *so;
2051
2052         if (fp->f_type != DTYPE_SOCKET)
2053                 return (NULL);
2054         if ((so = fp->f_data) == NULL)
2055                 return (NULL);
2056         if (so->so_proto->pr_domain != &localdomain)
2057                 return (NULL);
2058         return sotounpcb(so);
2059 }
2060
2061 static void
2062 unp_discard(struct file *fp)
2063 {
2064         struct unp_defer *dr;
2065
2066         if (unp_externalize_fp(fp)) {
2067                 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2068                 dr->ud_fp = fp;
2069                 UNP_DEFERRED_LOCK();
2070                 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2071                 UNP_DEFERRED_UNLOCK();
2072                 atomic_add_int(&unp_defers_count, 1);
2073                 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2074         } else
2075                 (void) closef(fp, (struct thread *)NULL);
2076 }
2077
2078 static void
2079 unp_process_defers(void *arg __unused, int pending)
2080 {
2081         struct unp_defer *dr;
2082         SLIST_HEAD(, unp_defer) drl;
2083         int count;
2084
2085         SLIST_INIT(&drl);
2086         for (;;) {
2087                 UNP_DEFERRED_LOCK();
2088                 if (SLIST_FIRST(&unp_defers) == NULL) {
2089                         UNP_DEFERRED_UNLOCK();
2090                         break;
2091                 }
2092                 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2093                 UNP_DEFERRED_UNLOCK();
2094                 count = 0;
2095                 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2096                         SLIST_REMOVE_HEAD(&drl, ud_link);
2097                         closef(dr->ud_fp, NULL);
2098                         free(dr, M_TEMP);
2099                         count++;
2100                 }
2101                 atomic_add_int(&unp_defers_count, -count);
2102         }
2103 }
2104
2105 static void
2106 unp_internalize_fp(struct file *fp)
2107 {
2108         struct unpcb *unp;
2109
2110         UNP_LINK_WLOCK();
2111         if ((unp = fptounp(fp)) != NULL) {
2112                 unp->unp_file = fp;
2113                 unp->unp_msgcount++;
2114         }
2115         fhold(fp);
2116         unp_rights++;
2117         UNP_LINK_WUNLOCK();
2118 }
2119
2120 static int
2121 unp_externalize_fp(struct file *fp)
2122 {
2123         struct unpcb *unp;
2124         int ret;
2125
2126         UNP_LINK_WLOCK();
2127         if ((unp = fptounp(fp)) != NULL) {
2128                 unp->unp_msgcount--;
2129                 ret = 1;
2130         } else
2131                 ret = 0;
2132         unp_rights--;
2133         UNP_LINK_WUNLOCK();
2134         return (ret);
2135 }
2136
2137 /*
2138  * unp_defer indicates whether additional work has been defered for a future
2139  * pass through unp_gc().  It is thread local and does not require explicit
2140  * synchronization.
2141  */
2142 static int      unp_marked;
2143 static int      unp_unreachable;
2144
2145 static void
2146 unp_accessable(struct filedescent **fdep, int fdcount)
2147 {
2148         struct unpcb *unp;
2149         struct file *fp;
2150         int i;
2151
2152         for (i = 0; i < fdcount; i++) {
2153                 fp = fdep[i]->fde_file;
2154                 if ((unp = fptounp(fp)) == NULL)
2155                         continue;
2156                 if (unp->unp_gcflag & UNPGC_REF)
2157                         continue;
2158                 unp->unp_gcflag &= ~UNPGC_DEAD;
2159                 unp->unp_gcflag |= UNPGC_REF;
2160                 unp_marked++;
2161         }
2162 }
2163
2164 static void
2165 unp_gc_process(struct unpcb *unp)
2166 {
2167         struct socket *soa;
2168         struct socket *so;
2169         struct file *fp;
2170
2171         /* Already processed. */
2172         if (unp->unp_gcflag & UNPGC_SCANNED)
2173                 return;
2174         fp = unp->unp_file;
2175
2176         /*
2177          * Check for a socket potentially in a cycle.  It must be in a
2178          * queue as indicated by msgcount, and this must equal the file
2179          * reference count.  Note that when msgcount is 0 the file is NULL.
2180          */
2181         if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2182             unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2183                 unp->unp_gcflag |= UNPGC_DEAD;
2184                 unp_unreachable++;
2185                 return;
2186         }
2187
2188         /*
2189          * Mark all sockets we reference with RIGHTS.
2190          */
2191         so = unp->unp_socket;
2192         SOCKBUF_LOCK(&so->so_rcv);
2193         unp_scan(so->so_rcv.sb_mb, unp_accessable);
2194         SOCKBUF_UNLOCK(&so->so_rcv);
2195
2196         /*
2197          * Mark all sockets in our accept queue.
2198          */
2199         ACCEPT_LOCK();
2200         TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2201                 SOCKBUF_LOCK(&soa->so_rcv);
2202                 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2203                 SOCKBUF_UNLOCK(&soa->so_rcv);
2204         }
2205         ACCEPT_UNLOCK();
2206         unp->unp_gcflag |= UNPGC_SCANNED;
2207 }
2208
2209 static int unp_recycled;
2210 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2211     "Number of unreachable sockets claimed by the garbage collector.");
2212
2213 static int unp_taskcount;
2214 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2215     "Number of times the garbage collector has run.");
2216
2217 static void
2218 unp_gc(__unused void *arg, int pending)
2219 {
2220         struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2221                                     NULL };
2222         struct unp_head **head;
2223         struct file *f, **unref;
2224         struct unpcb *unp;
2225         int i, total;
2226
2227         unp_taskcount++;
2228         UNP_LIST_LOCK();
2229         /*
2230          * First clear all gc flags from previous runs.
2231          */
2232         for (head = heads; *head != NULL; head++)
2233                 LIST_FOREACH(unp, *head, unp_link)
2234                         unp->unp_gcflag = 0;
2235
2236         /*
2237          * Scan marking all reachable sockets with UNPGC_REF.  Once a socket
2238          * is reachable all of the sockets it references are reachable.
2239          * Stop the scan once we do a complete loop without discovering
2240          * a new reachable socket.
2241          */
2242         do {
2243                 unp_unreachable = 0;
2244                 unp_marked = 0;
2245                 for (head = heads; *head != NULL; head++)
2246                         LIST_FOREACH(unp, *head, unp_link)
2247                                 unp_gc_process(unp);
2248         } while (unp_marked);
2249         UNP_LIST_UNLOCK();
2250         if (unp_unreachable == 0)
2251                 return;
2252
2253         /*
2254          * Allocate space for a local list of dead unpcbs.
2255          */
2256         unref = malloc(unp_unreachable * sizeof(struct file *),
2257             M_TEMP, M_WAITOK);
2258
2259         /*
2260          * Iterate looking for sockets which have been specifically marked
2261          * as as unreachable and store them locally.
2262          */
2263         UNP_LINK_RLOCK();
2264         UNP_LIST_LOCK();
2265         for (total = 0, head = heads; *head != NULL; head++)
2266                 LIST_FOREACH(unp, *head, unp_link)
2267                         if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2268                                 f = unp->unp_file;
2269                                 if (unp->unp_msgcount == 0 || f == NULL ||
2270                                     f->f_count != unp->unp_msgcount)
2271                                         continue;
2272                                 unref[total++] = f;
2273                                 fhold(f);
2274                                 KASSERT(total <= unp_unreachable,
2275                                     ("unp_gc: incorrect unreachable count."));
2276                         }
2277         UNP_LIST_UNLOCK();
2278         UNP_LINK_RUNLOCK();
2279
2280         /*
2281          * Now flush all sockets, free'ing rights.  This will free the
2282          * struct files associated with these sockets but leave each socket
2283          * with one remaining ref.
2284          */
2285         for (i = 0; i < total; i++) {
2286                 struct socket *so;
2287
2288                 so = unref[i]->f_data;
2289                 CURVNET_SET(so->so_vnet);
2290                 sorflush(so);
2291                 CURVNET_RESTORE();
2292         }
2293
2294         /*
2295          * And finally release the sockets so they can be reclaimed.
2296          */
2297         for (i = 0; i < total; i++)
2298                 fdrop(unref[i], NULL);
2299         unp_recycled += total;
2300         free(unref, M_TEMP);
2301 }
2302
2303 static void
2304 unp_dispose(struct mbuf *m)
2305 {
2306
2307         if (m)
2308                 unp_scan(m, unp_freerights);
2309 }
2310
2311 static void
2312 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2313 {
2314         struct mbuf *m;
2315         struct cmsghdr *cm;
2316         void *data;
2317         socklen_t clen, datalen;
2318
2319         while (m0 != NULL) {
2320                 for (m = m0; m; m = m->m_next) {
2321                         if (m->m_type != MT_CONTROL)
2322                                 continue;
2323
2324                         cm = mtod(m, struct cmsghdr *);
2325                         clen = m->m_len;
2326
2327                         while (cm != NULL) {
2328                                 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2329                                         break;
2330
2331                                 data = CMSG_DATA(cm);
2332                                 datalen = (caddr_t)cm + cm->cmsg_len
2333                                     - (caddr_t)data;
2334
2335                                 if (cm->cmsg_level == SOL_SOCKET &&
2336                                     cm->cmsg_type == SCM_RIGHTS) {
2337                                         (*op)(data, datalen /
2338                                             sizeof(struct filedescent *));
2339                                 }
2340
2341                                 if (CMSG_SPACE(datalen) < clen) {
2342                                         clen -= CMSG_SPACE(datalen);
2343                                         cm = (struct cmsghdr *)
2344                                             ((caddr_t)cm + CMSG_SPACE(datalen));
2345                                 } else {
2346                                         clen = 0;
2347                                         cm = NULL;
2348                                 }
2349                         }
2350                 }
2351                 m0 = m0->m_act;
2352         }
2353 }
2354
2355 /*
2356  * A helper function called by VFS before socket-type vnode reclamation.
2357  * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2358  * use count.
2359  */
2360 void
2361 vfs_unp_reclaim(struct vnode *vp)
2362 {
2363         struct socket *so;
2364         struct unpcb *unp;
2365         int active;
2366
2367         ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2368         KASSERT(vp->v_type == VSOCK,
2369             ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2370
2371         active = 0;
2372         UNP_LINK_WLOCK();
2373         VOP_UNP_CONNECT(vp, &so);
2374         if (so == NULL)
2375                 goto done;
2376         unp = sotounpcb(so);
2377         if (unp == NULL)
2378                 goto done;
2379         UNP_PCB_LOCK(unp);
2380         if (unp->unp_vnode == vp) {
2381                 VOP_UNP_DETACH(vp);
2382                 unp->unp_vnode = NULL;
2383                 active = 1;
2384         }
2385         UNP_PCB_UNLOCK(unp);
2386 done:
2387         UNP_LINK_WUNLOCK();
2388         if (active)
2389                 vunref(vp);
2390 }
2391
2392 #ifdef DDB
2393 static void
2394 db_print_indent(int indent)
2395 {
2396         int i;
2397
2398         for (i = 0; i < indent; i++)
2399                 db_printf(" ");
2400 }
2401
2402 static void
2403 db_print_unpflags(int unp_flags)
2404 {
2405         int comma;
2406
2407         comma = 0;
2408         if (unp_flags & UNP_HAVEPC) {
2409                 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2410                 comma = 1;
2411         }
2412         if (unp_flags & UNP_HAVEPCCACHED) {
2413                 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2414                 comma = 1;
2415         }
2416         if (unp_flags & UNP_WANTCRED) {
2417                 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2418                 comma = 1;
2419         }
2420         if (unp_flags & UNP_CONNWAIT) {
2421                 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2422                 comma = 1;
2423         }
2424         if (unp_flags & UNP_CONNECTING) {
2425                 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2426                 comma = 1;
2427         }
2428         if (unp_flags & UNP_BINDING) {
2429                 db_printf("%sUNP_BINDING", comma ? ", " : "");
2430                 comma = 1;
2431         }
2432 }
2433
2434 static void
2435 db_print_xucred(int indent, struct xucred *xu)
2436 {
2437         int comma, i;
2438
2439         db_print_indent(indent);
2440         db_printf("cr_version: %u   cr_uid: %u   cr_ngroups: %d\n",
2441             xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2442         db_print_indent(indent);
2443         db_printf("cr_groups: ");
2444         comma = 0;
2445         for (i = 0; i < xu->cr_ngroups; i++) {
2446                 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2447                 comma = 1;
2448         }
2449         db_printf("\n");
2450 }
2451
2452 static void
2453 db_print_unprefs(int indent, struct unp_head *uh)
2454 {
2455         struct unpcb *unp;
2456         int counter;
2457
2458         counter = 0;
2459         LIST_FOREACH(unp, uh, unp_reflink) {
2460                 if (counter % 4 == 0)
2461                         db_print_indent(indent);
2462                 db_printf("%p  ", unp);
2463                 if (counter % 4 == 3)
2464                         db_printf("\n");
2465                 counter++;
2466         }
2467         if (counter != 0 && counter % 4 != 0)
2468                 db_printf("\n");
2469 }
2470
2471 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2472 {
2473         struct unpcb *unp;
2474
2475         if (!have_addr) {
2476                 db_printf("usage: show unpcb <addr>\n");
2477                 return;
2478         }
2479         unp = (struct unpcb *)addr;
2480
2481         db_printf("unp_socket: %p   unp_vnode: %p\n", unp->unp_socket,
2482             unp->unp_vnode);
2483
2484         db_printf("unp_ino: %ju   unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2485             unp->unp_conn);
2486
2487         db_printf("unp_refs:\n");
2488         db_print_unprefs(2, &unp->unp_refs);
2489
2490         /* XXXRW: Would be nice to print the full address, if any. */
2491         db_printf("unp_addr: %p\n", unp->unp_addr);
2492
2493         db_printf("unp_cc: %d   unp_mbcnt: %d   unp_gencnt: %llu\n",
2494             unp->unp_cc, unp->unp_mbcnt,
2495             (unsigned long long)unp->unp_gencnt);
2496
2497         db_printf("unp_flags: %x (", unp->unp_flags);
2498         db_print_unpflags(unp->unp_flags);
2499         db_printf(")\n");
2500
2501         db_printf("unp_peercred:\n");
2502         db_print_xucred(2, &unp->unp_peercred);
2503
2504         db_printf("unp_refcount: %u\n", unp->unp_refcount);
2505 }
2506 #endif