sys/kern/uipc_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2004-2009 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
  32  */
  33
  34 /*
  35  * UNIX Domain (Local) Sockets
  36  *
  37  * This is an implementation of UNIX (local) domain sockets.  Each socket has
  38  * an associated struct unpcb (UNIX protocol control block).  Stream sockets
  39  * may be connected to 0 or 1 other socket.  Datagram sockets may be
  40  * connected to 0, 1, or many other sockets.  Sockets may be created and
  41  * connected in pairs (socketpair(2)), or bound/connected to using the file
  42  * system name space.  For most purposes, only the receive socket buffer is
  43  * used, as sending on one socket delivers directly to the receive socket
  44  * buffer of a second socket.
  45  *
  46  * The implementation is substantially complicated by the fact that
  47  * "ancillary data", such as file descriptors or credentials, may be passed
  48  * across UNIX domain sockets.  The potential for passing UNIX domain sockets
  49  * over other UNIX domain sockets requires the implementation of a simple
  50  * garbage collector to find and tear down cycles of disconnected sockets.
  51  *
  52  * TODO:
  53  *      RDM
  54  *      rethink name space problems
  55  *      need a proper out-of-band
  56  */
  57
  58 #include <sys/cdefs.h>
  59 __FBSDID("$FreeBSD$");
  60
  61 #include "opt_ddb.h"
  62
  63 #include <sys/param.h>
  64 #include <sys/capsicum.h>
  65 #include <sys/domain.h>
  66 #include <sys/fcntl.h>
  67 #include <sys/malloc.h>         /* XXX must be before <sys/file.h> */
  68 #include <sys/eventhandler.h>
  69 #include <sys/file.h>
  70 #include <sys/filedesc.h>
  71 #include <sys/kernel.h>
  72 #include <sys/lock.h>
  73 #include <sys/mbuf.h>
  74 #include <sys/mount.h>
  75 #include <sys/mutex.h>
  76 #include <sys/namei.h>
  77 #include <sys/proc.h>
  78 #include <sys/protosw.h>
  79 #include <sys/queue.h>
  80 #include <sys/resourcevar.h>
  81 #include <sys/rwlock.h>
  82 #include <sys/socket.h>
  83 #include <sys/socketvar.h>
  84 #include <sys/signalvar.h>
  85 #include <sys/stat.h>
  86 #include <sys/sx.h>
  87 #include <sys/sysctl.h>
  88 #include <sys/systm.h>
  89 #include <sys/taskqueue.h>
  90 #include <sys/un.h>
  91 #include <sys/unpcb.h>
  92 #include <sys/vnode.h>
  93
  94 #include <net/vnet.h>
  95
  96 #ifdef DDB
  97 #include <ddb/ddb.h>
  98 #endif
  99
 100 #include <security/mac/mac_framework.h>
 101
 102 #include <vm/uma.h>
 103
 104 MALLOC_DECLARE(M_FILECAPS);
 105
 106 /*
 107  * Locking key:
 108  * (l)  Locked using list lock
 109  * (g)  Locked using linkage lock
 110  */
 111
 112 static uma_zone_t       unp_zone;
 113 static unp_gen_t        unp_gencnt;     /* (l) */
 114 static u_int            unp_count;      /* (l) Count of local sockets. */
 115 static ino_t            unp_ino;        /* Prototype for fake inode numbers. */
 116 static int              unp_rights;     /* (g) File descriptors in flight. */
 117 static struct unp_head  unp_shead;      /* (l) List of stream sockets. */
 118 static struct unp_head  unp_dhead;      /* (l) List of datagram sockets. */
 119 static struct unp_head  unp_sphead;     /* (l) List of seqpacket sockets. */
 120
 121 struct unp_defer {
 122         SLIST_ENTRY(unp_defer) ud_link;
 123         struct file *ud_fp;
 124 };
 125 static SLIST_HEAD(, unp_defer) unp_defers;
 126 static int unp_defers_count;
 127
 128 static const struct sockaddr    sun_noname = { sizeof(sun_noname), AF_LOCAL };
 129
 130 /*
 131  * Garbage collection of cyclic file descriptor/socket references occurs
 132  * asynchronously in a taskqueue context in order to avoid recursion and
 133  * reentrance in the UNIX domain socket, file descriptor, and socket layer
 134  * code.  See unp_gc() for a full description.
 135  */
 136 static struct timeout_task unp_gc_task;
 137
 138 /*
 139  * The close of unix domain sockets attached as SCM_RIGHTS is
 140  * postponed to the taskqueue, to avoid arbitrary recursion depth.
 141  * The attached sockets might have another sockets attached.
 142  */
 143 static struct task      unp_defer_task;
 144
 145 /*
 146  * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
 147  * stream sockets, although the total for sender and receiver is actually
 148  * only PIPSIZ.
 149  *
 150  * Datagram sockets really use the sendspace as the maximum datagram size,
 151  * and don't really want to reserve the sendspace.  Their recvspace should be
 152  * large enough for at least one max-size datagram plus address.
 153  */
 154 #ifndef PIPSIZ
 155 #define PIPSIZ  8192
 156 #endif
 157 static u_long   unpst_sendspace = PIPSIZ;
 158 static u_long   unpst_recvspace = PIPSIZ;
 159 static u_long   unpdg_sendspace = 2*1024;       /* really max datagram size */
 160 static u_long   unpdg_recvspace = 4*1024;
 161 static u_long   unpsp_sendspace = PIPSIZ;       /* really max datagram size */
 162 static u_long   unpsp_recvspace = PIPSIZ;
 163
 164 static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
 165 static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
 166     "SOCK_STREAM");
 167 static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
 168 static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
 169     "SOCK_SEQPACKET");
 170
 171 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
 172            &unpst_sendspace, 0, "Default stream send space.");
 173 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
 174            &unpst_recvspace, 0, "Default stream receive space.");
 175 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
 176            &unpdg_sendspace, 0, "Default datagram send space.");
 177 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
 178            &unpdg_recvspace, 0, "Default datagram receive space.");
 179 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
 180            &unpsp_sendspace, 0, "Default seqpacket send space.");
 181 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
 182            &unpsp_recvspace, 0, "Default seqpacket receive space.");
 183 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
 184     "File descriptors in flight.");
 185 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
 186     &unp_defers_count, 0,
 187     "File descriptors deferred to taskqueue for close.");
 188
 189 /*
 190  * Locking and synchronization:
 191  *
 192  * Three types of locks exit in the local domain socket implementation: a
 193  * global list mutex, a global linkage rwlock, and per-unpcb mutexes.  Of the
 194  * global locks, the list lock protects the socket count, global generation
 195  * number, and stream/datagram global lists.  The linkage lock protects the
 196  * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
 197  * held exclusively over the acquisition of multiple unpcb locks to prevent
 198  * deadlock.
 199  *
 200  * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
 201  * allocated in pru_attach() and freed in pru_detach().  The validity of that
 202  * pointer is an invariant, so no lock is required to dereference the so_pcb
 203  * pointer if a valid socket reference is held by the caller.  In practice,
 204  * this is always true during operations performed on a socket.  Each unpcb
 205  * has a back-pointer to its socket, unp_socket, which will be stable under
 206  * the same circumstances.
 207  *
 208  * This pointer may only be safely dereferenced as long as a valid reference
 209  * to the unpcb is held.  Typically, this reference will be from the socket,
 210  * or from another unpcb when the referring unpcb's lock is held (in order
 211  * that the reference not be invalidated during use).  For example, to follow
 212  * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
 213  * as unp_socket remains valid as long as the reference to unp_conn is valid.
 214  *
 215  * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx.  Individual
 216  * atomic reads without the lock may be performed "lockless", but more
 217  * complex reads and read-modify-writes require the mutex to be held.  No
 218  * lock order is defined between unpcb locks -- multiple unpcb locks may be
 219  * acquired at the same time only when holding the linkage rwlock
 220  * exclusively, which prevents deadlocks.
 221  *
 222  * Blocking with UNIX domain sockets is a tricky issue: unlike most network
 223  * protocols, bind() is a non-atomic operation, and connect() requires
 224  * potential sleeping in the protocol, due to potentially waiting on local or
 225  * distributed file systems.  We try to separate "lookup" operations, which
 226  * may sleep, and the IPC operations themselves, which typically can occur
 227  * with relative atomicity as locks can be held over the entire operation.
 228  *
 229  * Another tricky issue is simultaneous multi-threaded or multi-process
 230  * access to a single UNIX domain socket.  These are handled by the flags
 231  * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
 232  * binding, both of which involve dropping UNIX domain socket locks in order
 233  * to perform namei() and other file system operations.
 234  */
 235 static struct rwlock    unp_link_rwlock;
 236 static struct mtx       unp_list_lock;
 237 static struct mtx       unp_defers_lock;
 238
 239 #define UNP_LINK_LOCK_INIT()            rw_init(&unp_link_rwlock,       \
 240                                             "unp_link_rwlock")
 241
 242 #define UNP_LINK_LOCK_ASSERT()  rw_assert(&unp_link_rwlock,     \
 243                                             RA_LOCKED)
 244 #define UNP_LINK_UNLOCK_ASSERT()        rw_assert(&unp_link_rwlock,     \
 245                                             RA_UNLOCKED)
 246
 247 #define UNP_LINK_RLOCK()                rw_rlock(&unp_link_rwlock)
 248 #define UNP_LINK_RUNLOCK()              rw_runlock(&unp_link_rwlock)
 249 #define UNP_LINK_WLOCK()                rw_wlock(&unp_link_rwlock)
 250 #define UNP_LINK_WUNLOCK()              rw_wunlock(&unp_link_rwlock)
 251 #define UNP_LINK_WLOCK_ASSERT()         rw_assert(&unp_link_rwlock,     \
 252                                             RA_WLOCKED)
 253
 254 #define UNP_LIST_LOCK_INIT()            mtx_init(&unp_list_lock,        \
 255                                             "unp_list_lock", NULL, MTX_DEF)
 256 #define UNP_LIST_LOCK()                 mtx_lock(&unp_list_lock)
 257 #define UNP_LIST_UNLOCK()               mtx_unlock(&unp_list_lock)
 258
 259 #define UNP_DEFERRED_LOCK_INIT()        mtx_init(&unp_defers_lock, \
 260                                             "unp_defer", NULL, MTX_DEF)
 261 #define UNP_DEFERRED_LOCK()             mtx_lock(&unp_defers_lock)
 262 #define UNP_DEFERRED_UNLOCK()           mtx_unlock(&unp_defers_lock)
 263
 264 #define UNP_PCB_LOCK_INIT(unp)          mtx_init(&(unp)->unp_mtx,       \
 265                                             "unp_mtx", "unp_mtx",       \
 266                                             MTX_DUPOK|MTX_DEF|MTX_RECURSE)
 267 #define UNP_PCB_LOCK_DESTROY(unp)       mtx_destroy(&(unp)->unp_mtx)
 268 #define UNP_PCB_LOCK(unp)               mtx_lock(&(unp)->unp_mtx)
 269 #define UNP_PCB_UNLOCK(unp)             mtx_unlock(&(unp)->unp_mtx)
 270 #define UNP_PCB_LOCK_ASSERT(unp)        mtx_assert(&(unp)->unp_mtx, MA_OWNED)
 271
 272 static int      uipc_connect2(struct socket *, struct socket *);
 273 static int      uipc_ctloutput(struct socket *, struct sockopt *);
 274 static int      unp_connect(struct socket *, struct sockaddr *,
 275                     struct thread *);
 276 static int      unp_connectat(int, struct socket *, struct sockaddr *,
 277                     struct thread *);
 278 static int      unp_connect2(struct socket *so, struct socket *so2, int);
 279 static void     unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
 280 static void     unp_dispose(struct mbuf *);
 281 static void     unp_shutdown(struct unpcb *);
 282 static void     unp_drop(struct unpcb *, int);
 283 static void     unp_gc(__unused void *, int);
 284 static void     unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
 285 static void     unp_discard(struct file *);
 286 static void     unp_freerights(struct filedescent **, int);
 287 static void     unp_init(void);
 288 static int      unp_internalize(struct mbuf **, struct thread *);
 289 static void     unp_internalize_fp(struct file *);
 290 static int      unp_externalize(struct mbuf *, struct mbuf **, int);
 291 static int      unp_externalize_fp(struct file *);
 292 static struct mbuf      *unp_addsockcred(struct thread *, struct mbuf *);
 293 static void     unp_process_defers(void * __unused, int);
 294
 295 /*
 296  * Definitions of protocols supported in the LOCAL domain.
 297  */
 298 static struct domain localdomain;
 299 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
 300 static struct pr_usrreqs uipc_usrreqs_seqpacket;
 301 static struct protosw localsw[] = {
 302 {
 303         .pr_type =              SOCK_STREAM,
 304         .pr_domain =            &localdomain,
 305         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
 306         .pr_ctloutput =         &uipc_ctloutput,
 307         .pr_usrreqs =           &uipc_usrreqs_stream
 308 },
 309 {
 310         .pr_type =              SOCK_DGRAM,
 311         .pr_domain =            &localdomain,
 312         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_RIGHTS,
 313         .pr_ctloutput =         &uipc_ctloutput,
 314         .pr_usrreqs =           &uipc_usrreqs_dgram
 315 },
 316 {
 317         .pr_type =              SOCK_SEQPACKET,
 318         .pr_domain =            &localdomain,
 319
 320         /*
 321          * XXXRW: For now, PR_ADDR because soreceive will bump into them
 322          * due to our use of sbappendaddr.  A new sbappend variants is needed
 323          * that supports both atomic record writes and control data.
 324          */
 325         .pr_flags =             PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
 326                                     PR_RIGHTS,
 327         .pr_ctloutput =         &uipc_ctloutput,
 328         .pr_usrreqs =           &uipc_usrreqs_seqpacket,
 329 },
 330 };
 331
 332 static struct domain localdomain = {
 333         .dom_family =           AF_LOCAL,
 334         .dom_name =             "local",
 335         .dom_init =             unp_init,
 336         .dom_externalize =      unp_externalize,
 337         .dom_dispose =          unp_dispose,
 338         .dom_protosw =          localsw,
 339         .dom_protoswNPROTOSW =  &localsw[sizeof(localsw)/sizeof(localsw[0])]
 340 };
 341 DOMAIN_SET(local);
 342
 343 static void
 344 uipc_abort(struct socket *so)
 345 {
 346         struct unpcb *unp, *unp2;
 347
 348         unp = sotounpcb(so);
 349         KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
 350
 351         UNP_LINK_WLOCK();
 352         UNP_PCB_LOCK(unp);
 353         unp2 = unp->unp_conn;
 354         if (unp2 != NULL) {
 355                 UNP_PCB_LOCK(unp2);
 356                 unp_drop(unp2, ECONNABORTED);
 357                 UNP_PCB_UNLOCK(unp2);
 358         }
 359         UNP_PCB_UNLOCK(unp);
 360         UNP_LINK_WUNLOCK();
 361 }
 362
 363 static int
 364 uipc_accept(struct socket *so, struct sockaddr **nam)
 365 {
 366         struct unpcb *unp, *unp2;
 367         const struct sockaddr *sa;
 368
 369         /*
 370          * Pass back name of connected socket, if it was bound and we are
 371          * still connected (our peer may have closed already!).
 372          */
 373         unp = sotounpcb(so);
 374         KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
 375
 376         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 377         UNP_LINK_RLOCK();
 378         unp2 = unp->unp_conn;
 379         if (unp2 != NULL && unp2->unp_addr != NULL) {
 380                 UNP_PCB_LOCK(unp2);
 381                 sa = (struct sockaddr *) unp2->unp_addr;
 382                 bcopy(sa, *nam, sa->sa_len);
 383                 UNP_PCB_UNLOCK(unp2);
 384         } else {
 385                 sa = &sun_noname;
 386                 bcopy(sa, *nam, sa->sa_len);
 387         }
 388         UNP_LINK_RUNLOCK();
 389         return (0);
 390 }
 391
 392 static int
 393 uipc_attach(struct socket *so, int proto, struct thread *td)
 394 {
 395         u_long sendspace, recvspace;
 396         struct unpcb *unp;
 397         int error;
 398
 399         KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
 400         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 401                 switch (so->so_type) {
 402                 case SOCK_STREAM:
 403                         sendspace = unpst_sendspace;
 404                         recvspace = unpst_recvspace;
 405                         break;
 406
 407                 case SOCK_DGRAM:
 408                         sendspace = unpdg_sendspace;
 409                         recvspace = unpdg_recvspace;
 410                         break;
 411
 412                 case SOCK_SEQPACKET:
 413                         sendspace = unpsp_sendspace;
 414                         recvspace = unpsp_recvspace;
 415                         break;
 416
 417                 default:
 418                         panic("uipc_attach");
 419                 }
 420                 error = soreserve(so, sendspace, recvspace);
 421                 if (error)
 422                         return (error);
 423         }
 424         unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
 425         if (unp == NULL)
 426                 return (ENOBUFS);
 427         LIST_INIT(&unp->unp_refs);
 428         UNP_PCB_LOCK_INIT(unp);
 429         unp->unp_socket = so;
 430         so->so_pcb = unp;
 431         unp->unp_refcount = 1;
 432
 433         UNP_LIST_LOCK();
 434         unp->unp_gencnt = ++unp_gencnt;
 435         unp_count++;
 436         switch (so->so_type) {
 437         case SOCK_STREAM:
 438                 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
 439                 break;
 440
 441         case SOCK_DGRAM:
 442                 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
 443                 break;
 444
 445         case SOCK_SEQPACKET:
 446                 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
 447                 break;
 448
 449         default:
 450                 panic("uipc_attach");
 451         }
 452         UNP_LIST_UNLOCK();
 453
 454         return (0);
 455 }
 456
 457 static int
 458 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
 459 {
 460         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
 461         struct vattr vattr;
 462         int error, namelen;
 463         struct nameidata nd;
 464         struct unpcb *unp;
 465         struct vnode *vp;
 466         struct mount *mp;
 467         cap_rights_t rights;
 468         char *buf;
 469
 470         if (nam->sa_family != AF_UNIX)
 471                 return (EAFNOSUPPORT);
 472
 473         unp = sotounpcb(so);
 474         KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
 475
 476         if (soun->sun_len > sizeof(struct sockaddr_un))
 477                 return (EINVAL);
 478         namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
 479         if (namelen <= 0)
 480                 return (EINVAL);
 481
 482         /*
 483          * We don't allow simultaneous bind() calls on a single UNIX domain
 484          * socket, so flag in-progress operations, and return an error if an
 485          * operation is already in progress.
 486          *
 487          * Historically, we have not allowed a socket to be rebound, so this
 488          * also returns an error.  Not allowing re-binding simplifies the
 489          * implementation and avoids a great many possible failure modes.
 490          */
 491         UNP_PCB_LOCK(unp);
 492         if (unp->unp_vnode != NULL) {
 493                 UNP_PCB_UNLOCK(unp);
 494                 return (EINVAL);
 495         }
 496         if (unp->unp_flags & UNP_BINDING) {
 497                 UNP_PCB_UNLOCK(unp);
 498                 return (EALREADY);
 499         }
 500         unp->unp_flags |= UNP_BINDING;
 501         UNP_PCB_UNLOCK(unp);
 502
 503         buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
 504         bcopy(soun->sun_path, buf, namelen);
 505         buf[namelen] = 0;
 506
 507 restart:
 508         NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE,
 509             UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td);
 510 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
 511         error = namei(&nd);
 512         if (error)
 513                 goto error;
 514         vp = nd.ni_vp;
 515         if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
 516                 NDFREE(&nd, NDF_ONLY_PNBUF);
 517                 if (nd.ni_dvp == vp)
 518                         vrele(nd.ni_dvp);
 519                 else
 520                         vput(nd.ni_dvp);
 521                 if (vp != NULL) {
 522                         vrele(vp);
 523                         error = EADDRINUSE;
 524                         goto error;
 525                 }
 526                 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
 527                 if (error)
 528                         goto error;
 529                 goto restart;
 530         }
 531         VATTR_NULL(&vattr);
 532         vattr.va_type = VSOCK;
 533         vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
 534 #ifdef MAC
 535         error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
 536             &vattr);
 537 #endif
 538         if (error == 0)
 539                 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
 540         NDFREE(&nd, NDF_ONLY_PNBUF);
 541         vput(nd.ni_dvp);
 542         if (error) {
 543                 vn_finished_write(mp);
 544                 goto error;
 545         }
 546         vp = nd.ni_vp;
 547         ASSERT_VOP_ELOCKED(vp, "uipc_bind");
 548         soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
 549
 550         UNP_LINK_WLOCK();
 551         UNP_PCB_LOCK(unp);
 552         VOP_UNP_BIND(vp, unp->unp_socket);
 553         unp->unp_vnode = vp;
 554         unp->unp_addr = soun;
 555         unp->unp_flags &= ~UNP_BINDING;
 556         UNP_PCB_UNLOCK(unp);
 557         UNP_LINK_WUNLOCK();
 558         VOP_UNLOCK(vp, 0);
 559         vn_finished_write(mp);
 560         free(buf, M_TEMP);
 561         return (0);
 562
 563 error:
 564         UNP_PCB_LOCK(unp);
 565         unp->unp_flags &= ~UNP_BINDING;
 566         UNP_PCB_UNLOCK(unp);
 567         free(buf, M_TEMP);
 568         return (error);
 569 }
 570
 571 static int
 572 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 573 {
 574
 575         return (uipc_bindat(AT_FDCWD, so, nam, td));
 576 }
 577
 578 static int
 579 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 580 {
 581         int error;
 582
 583         KASSERT(td == curthread, ("uipc_connect: td != curthread"));
 584         UNP_LINK_WLOCK();
 585         error = unp_connect(so, nam, td);
 586         UNP_LINK_WUNLOCK();
 587         return (error);
 588 }
 589
 590 static int
 591 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
 592     struct thread *td)
 593 {
 594         int error;
 595
 596         KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
 597         UNP_LINK_WLOCK();
 598         error = unp_connectat(fd, so, nam, td);
 599         UNP_LINK_WUNLOCK();
 600         return (error);
 601 }
 602
 603 static void
 604 uipc_close(struct socket *so)
 605 {
 606         struct unpcb *unp, *unp2;
 607
 608         unp = sotounpcb(so);
 609         KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
 610
 611         UNP_LINK_WLOCK();
 612         UNP_PCB_LOCK(unp);
 613         unp2 = unp->unp_conn;
 614         if (unp2 != NULL) {
 615                 UNP_PCB_LOCK(unp2);
 616                 unp_disconnect(unp, unp2);
 617                 UNP_PCB_UNLOCK(unp2);
 618         }
 619         UNP_PCB_UNLOCK(unp);
 620         UNP_LINK_WUNLOCK();
 621 }
 622
 623 static int
 624 uipc_connect2(struct socket *so1, struct socket *so2)
 625 {
 626         struct unpcb *unp, *unp2;
 627         int error;
 628
 629         UNP_LINK_WLOCK();
 630         unp = so1->so_pcb;
 631         KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
 632         UNP_PCB_LOCK(unp);
 633         unp2 = so2->so_pcb;
 634         KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
 635         UNP_PCB_LOCK(unp2);
 636         error = unp_connect2(so1, so2, PRU_CONNECT2);
 637         UNP_PCB_UNLOCK(unp2);
 638         UNP_PCB_UNLOCK(unp);
 639         UNP_LINK_WUNLOCK();
 640         return (error);
 641 }
 642
 643 static void
 644 uipc_detach(struct socket *so)
 645 {
 646         struct unpcb *unp, *unp2;
 647         struct sockaddr_un *saved_unp_addr;
 648         struct vnode *vp;
 649         int freeunp, local_unp_rights;
 650
 651         unp = sotounpcb(so);
 652         KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
 653
 654         UNP_LINK_WLOCK();
 655         UNP_LIST_LOCK();
 656         UNP_PCB_LOCK(unp);
 657         LIST_REMOVE(unp, unp_link);
 658         unp->unp_gencnt = ++unp_gencnt;
 659         --unp_count;
 660         UNP_LIST_UNLOCK();
 661
 662         /*
 663          * XXXRW: Should assert vp->v_socket == so.
 664          */
 665         if ((vp = unp->unp_vnode) != NULL) {
 666                 VOP_UNP_DETACH(vp);
 667                 unp->unp_vnode = NULL;
 668         }
 669         unp2 = unp->unp_conn;
 670         if (unp2 != NULL) {
 671                 UNP_PCB_LOCK(unp2);
 672                 unp_disconnect(unp, unp2);
 673                 UNP_PCB_UNLOCK(unp2);
 674         }
 675
 676         /*
 677          * We hold the linkage lock exclusively, so it's OK to acquire
 678          * multiple pcb locks at a time.
 679          */
 680         while (!LIST_EMPTY(&unp->unp_refs)) {
 681                 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
 682
 683                 UNP_PCB_LOCK(ref);
 684                 unp_drop(ref, ECONNRESET);
 685                 UNP_PCB_UNLOCK(ref);
 686         }
 687         local_unp_rights = unp_rights;
 688         UNP_LINK_WUNLOCK();
 689         unp->unp_socket->so_pcb = NULL;
 690         saved_unp_addr = unp->unp_addr;
 691         unp->unp_addr = NULL;
 692         unp->unp_refcount--;
 693         freeunp = (unp->unp_refcount == 0);
 694         if (saved_unp_addr != NULL)
 695                 free(saved_unp_addr, M_SONAME);
 696         if (freeunp) {
 697                 UNP_PCB_LOCK_DESTROY(unp);
 698                 uma_zfree(unp_zone, unp);
 699         } else
 700                 UNP_PCB_UNLOCK(unp);
 701         if (vp)
 702                 vrele(vp);
 703         if (local_unp_rights)
 704                 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
 705 }
 706
 707 static int
 708 uipc_disconnect(struct socket *so)
 709 {
 710         struct unpcb *unp, *unp2;
 711
 712         unp = sotounpcb(so);
 713         KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
 714
 715         UNP_LINK_WLOCK();
 716         UNP_PCB_LOCK(unp);
 717         unp2 = unp->unp_conn;
 718         if (unp2 != NULL) {
 719                 UNP_PCB_LOCK(unp2);
 720                 unp_disconnect(unp, unp2);
 721                 UNP_PCB_UNLOCK(unp2);
 722         }
 723         UNP_PCB_UNLOCK(unp);
 724         UNP_LINK_WUNLOCK();
 725         return (0);
 726 }
 727
 728 static int
 729 uipc_listen(struct socket *so, int backlog, struct thread *td)
 730 {
 731         struct unpcb *unp;
 732         int error;
 733
 734         unp = sotounpcb(so);
 735         KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
 736
 737         UNP_PCB_LOCK(unp);
 738         if (unp->unp_vnode == NULL) {
 739                 UNP_PCB_UNLOCK(unp);
 740                 return (EINVAL);
 741         }
 742
 743         SOCK_LOCK(so);
 744         error = solisten_proto_check(so);
 745         if (error == 0) {
 746                 cru2x(td->td_ucred, &unp->unp_peercred);
 747                 unp->unp_flags |= UNP_HAVEPCCACHED;
 748                 solisten_proto(so, backlog);
 749         }
 750         SOCK_UNLOCK(so);
 751         UNP_PCB_UNLOCK(unp);
 752         return (error);
 753 }
 754
 755 static int
 756 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
 757 {
 758         struct unpcb *unp, *unp2;
 759         const struct sockaddr *sa;
 760
 761         unp = sotounpcb(so);
 762         KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
 763
 764         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
 765         UNP_LINK_RLOCK();
 766         /*
 767          * XXX: It seems that this test always fails even when connection is
 768          * established.  So, this else clause is added as workaround to
 769          * return PF_LOCAL sockaddr.
 770          */
 771         unp2 = unp->unp_conn;
 772         if (unp2 != NULL) {
 773                 UNP_PCB_LOCK(unp2);
 774                 if (unp2->unp_addr != NULL)
 775                         sa = (struct sockaddr *) unp2->unp_addr;
 776                 else
 777                         sa = &sun_noname;
 778                 bcopy(sa, *nam, sa->sa_len);
 779                 UNP_PCB_UNLOCK(unp2);
 780         } else {
 781                 sa = &sun_noname;
 782                 bcopy(sa, *nam, sa->sa_len);
 783         }
 784         UNP_LINK_RUNLOCK();
 785         return (0);
 786 }
 787
 788 static int
 789 uipc_rcvd(struct socket *so, int flags)
 790 {
 791         struct unpcb *unp, *unp2;
 792         struct socket *so2;
 793         u_int mbcnt, sbcc;
 794
 795         unp = sotounpcb(so);
 796         KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
 797
 798         if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
 799                 panic("uipc_rcvd socktype %d", so->so_type);
 800
 801         /*
 802          * Adjust backpressure on sender and wakeup any waiting to write.
 803          *
 804          * The unp lock is acquired to maintain the validity of the unp_conn
 805          * pointer; no lock on unp2 is required as unp2->unp_socket will be
 806          * static as long as we don't permit unp2 to disconnect from unp,
 807          * which is prevented by the lock on unp.  We cache values from
 808          * so_rcv to avoid holding the so_rcv lock over the entire
 809          * transaction on the remote so_snd.
 810          */
 811         SOCKBUF_LOCK(&so->so_rcv);
 812         mbcnt = so->so_rcv.sb_mbcnt;
 813         sbcc = so->so_rcv.sb_cc;
 814         SOCKBUF_UNLOCK(&so->so_rcv);
 815         /*
 816          * There is a benign race condition at this point.  If we're planning to
 817          * clear SB_STOP, but uipc_send is called on the connected socket at
 818          * this instant, it might add data to the sockbuf and set SB_STOP.  Then
 819          * we would erroneously clear SB_STOP below, even though the sockbuf is
 820          * full.  The race is benign because the only ill effect is to allow the
 821          * sockbuf to exceed its size limit, and the size limits are not
 822          * strictly guaranteed anyway.
 823          */
 824         UNP_PCB_LOCK(unp);
 825         unp2 = unp->unp_conn;
 826         if (unp2 == NULL) {
 827                 UNP_PCB_UNLOCK(unp);
 828                 return (0);
 829         }
 830         so2 = unp2->unp_socket;
 831         SOCKBUF_LOCK(&so2->so_snd);
 832         if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
 833                 so2->so_snd.sb_flags &= ~SB_STOP;
 834         sowwakeup_locked(so2);
 835         UNP_PCB_UNLOCK(unp);
 836         return (0);
 837 }
 838
 839 static int
 840 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 841     struct mbuf *control, struct thread *td)
 842 {
 843         struct unpcb *unp, *unp2;
 844         struct socket *so2;
 845         u_int mbcnt, sbcc;
 846         int error = 0;
 847
 848         unp = sotounpcb(so);
 849         KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
 850
 851         if (flags & PRUS_OOB) {
 852                 error = EOPNOTSUPP;
 853                 goto release;
 854         }
 855         if (control != NULL && (error = unp_internalize(&control, td)))
 856                 goto release;
 857         if ((nam != NULL) || (flags & PRUS_EOF))
 858                 UNP_LINK_WLOCK();
 859         else
 860                 UNP_LINK_RLOCK();
 861         switch (so->so_type) {
 862         case SOCK_DGRAM:
 863         {
 864                 const struct sockaddr *from;
 865
 866                 unp2 = unp->unp_conn;
 867                 if (nam != NULL) {
 868                         UNP_LINK_WLOCK_ASSERT();
 869                         if (unp2 != NULL) {
 870                                 error = EISCONN;
 871                                 break;
 872                         }
 873                         error = unp_connect(so, nam, td);
 874                         if (error)
 875                                 break;
 876                         unp2 = unp->unp_conn;
 877                 }
 878
 879                 /*
 880                  * Because connect() and send() are non-atomic in a sendto()
 881                  * with a target address, it's possible that the socket will
 882                  * have disconnected before the send() can run.  In that case
 883                  * return the slightly counter-intuitive but otherwise
 884                  * correct error that the socket is not connected.
 885                  */
 886                 if (unp2 == NULL) {
 887                         error = ENOTCONN;
 888                         break;
 889                 }
 890                 /* Lockless read. */
 891                 if (unp2->unp_flags & UNP_WANTCRED)
 892                         control = unp_addsockcred(td, control);
 893                 UNP_PCB_LOCK(unp);
 894                 if (unp->unp_addr != NULL)
 895                         from = (struct sockaddr *)unp->unp_addr;
 896                 else
 897                         from = &sun_noname;
 898                 so2 = unp2->unp_socket;
 899                 SOCKBUF_LOCK(&so2->so_rcv);
 900                 if (sbappendaddr_locked(&so2->so_rcv, from, m,
 901                     control)) {
 902                         sorwakeup_locked(so2);
 903                         m = NULL;
 904                         control = NULL;
 905                 } else {
 906                         SOCKBUF_UNLOCK(&so2->so_rcv);
 907                         error = ENOBUFS;
 908                 }
 909                 if (nam != NULL) {
 910                         UNP_LINK_WLOCK_ASSERT();
 911                         UNP_PCB_LOCK(unp2);
 912                         unp_disconnect(unp, unp2);
 913                         UNP_PCB_UNLOCK(unp2);
 914                 }
 915                 UNP_PCB_UNLOCK(unp);
 916                 break;
 917         }
 918
 919         case SOCK_SEQPACKET:
 920         case SOCK_STREAM:
 921                 if ((so->so_state & SS_ISCONNECTED) == 0) {
 922                         if (nam != NULL) {
 923                                 UNP_LINK_WLOCK_ASSERT();
 924                                 error = unp_connect(so, nam, td);
 925                                 if (error)
 926                                         break;  /* XXX */
 927                         } else {
 928                                 error = ENOTCONN;
 929                                 break;
 930                         }
 931                 }
 932
 933                 /* Lockless read. */
 934                 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
 935                         error = EPIPE;
 936                         break;
 937                 }
 938
 939                 /*
 940                  * Because connect() and send() are non-atomic in a sendto()
 941                  * with a target address, it's possible that the socket will
 942                  * have disconnected before the send() can run.  In that case
 943                  * return the slightly counter-intuitive but otherwise
 944                  * correct error that the socket is not connected.
 945                  *
 946                  * Locking here must be done carefully: the linkage lock
 947                  * prevents interconnections between unpcbs from changing, so
 948                  * we can traverse from unp to unp2 without acquiring unp's
 949                  * lock.  Socket buffer locks follow unpcb locks, so we can
 950                  * acquire both remote and lock socket buffer locks.
 951                  */
 952                 unp2 = unp->unp_conn;
 953                 if (unp2 == NULL) {
 954                         error = ENOTCONN;
 955                         break;
 956                 }
 957                 so2 = unp2->unp_socket;
 958                 UNP_PCB_LOCK(unp2);
 959                 SOCKBUF_LOCK(&so2->so_rcv);
 960                 if (unp2->unp_flags & UNP_WANTCRED) {
 961                         /*
 962                          * Credentials are passed only once on SOCK_STREAM
 963                          * and SOCK_SEQPACKET.
 964                          */
 965                         unp2->unp_flags &= ~UNP_WANTCRED;
 966                         control = unp_addsockcred(td, control);
 967                 }
 968                 /*
 969                  * Send to paired receive port, and then reduce send buffer
 970                  * hiwater marks to maintain backpressure.  Wake up readers.
 971                  */
 972                 switch (so->so_type) {
 973                 case SOCK_STREAM:
 974                         if (control != NULL) {
 975                                 if (sbappendcontrol_locked(&so2->so_rcv, m,
 976                                     control))
 977                                         control = NULL;
 978                         } else
 979                                 sbappend_locked(&so2->so_rcv, m);
 980                         break;
 981
 982                 case SOCK_SEQPACKET: {
 983                         const struct sockaddr *from;
 984
 985                         from = &sun_noname;
 986                         /*
 987                          * Don't check for space available in so2->so_rcv.
 988                          * Unix domain sockets only check for space in the
 989                          * sending sockbuf, and that check is performed one
 990                          * level up the stack.
 991                          */
 992                         if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
 993                                 from, m, control))
 994                                 control = NULL;
 995                         break;
 996                         }
 997                 }
 998
 999                 mbcnt = so2->so_rcv.sb_mbcnt;
1000                 sbcc = so2->so_rcv.sb_cc;
1001                 sorwakeup_locked(so2);
1002
1003                 /*
1004                  * The PCB lock on unp2 protects the SB_STOP flag.  Without it,
1005                  * it would be possible for uipc_rcvd to be called at this
1006                  * point, drain the receiving sockbuf, clear SB_STOP, and then
1007                  * we would set SB_STOP below.  That could lead to an empty
1008                  * sockbuf having SB_STOP set
1009                  */
1010                 SOCKBUF_LOCK(&so->so_snd);
1011                 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1012                         so->so_snd.sb_flags |= SB_STOP;
1013                 SOCKBUF_UNLOCK(&so->so_snd);
1014                 UNP_PCB_UNLOCK(unp2);
1015                 m = NULL;
1016                 break;
1017
1018         default:
1019                 panic("uipc_send unknown socktype");
1020         }
1021
1022         /*
1023          * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1024          */
1025         if (flags & PRUS_EOF) {
1026                 UNP_PCB_LOCK(unp);
1027                 socantsendmore(so);
1028                 unp_shutdown(unp);
1029                 UNP_PCB_UNLOCK(unp);
1030         }
1031
1032         if ((nam != NULL) || (flags & PRUS_EOF))
1033                 UNP_LINK_WUNLOCK();
1034         else
1035                 UNP_LINK_RUNLOCK();
1036
1037         if (control != NULL && error != 0)
1038                 unp_dispose(control);
1039
1040 release:
1041         if (control != NULL)
1042                 m_freem(control);
1043         if (m != NULL)
1044                 m_freem(m);
1045         return (error);
1046 }
1047
1048 static int
1049 uipc_sense(struct socket *so, struct stat *sb)
1050 {
1051         struct unpcb *unp;
1052
1053         unp = sotounpcb(so);
1054         KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1055
1056         sb->st_blksize = so->so_snd.sb_hiwat;
1057         UNP_PCB_LOCK(unp);
1058         sb->st_dev = NODEV;
1059         if (unp->unp_ino == 0)
1060                 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1061         sb->st_ino = unp->unp_ino;
1062         UNP_PCB_UNLOCK(unp);
1063         return (0);
1064 }
1065
1066 static int
1067 uipc_shutdown(struct socket *so)
1068 {
1069         struct unpcb *unp;
1070
1071         unp = sotounpcb(so);
1072         KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1073
1074         UNP_LINK_WLOCK();
1075         UNP_PCB_LOCK(unp);
1076         socantsendmore(so);
1077         unp_shutdown(unp);
1078         UNP_PCB_UNLOCK(unp);
1079         UNP_LINK_WUNLOCK();
1080         return (0);
1081 }
1082
1083 static int
1084 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1085 {
1086         struct unpcb *unp;
1087         const struct sockaddr *sa;
1088
1089         unp = sotounpcb(so);
1090         KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1091
1092         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1093         UNP_PCB_LOCK(unp);
1094         if (unp->unp_addr != NULL)
1095                 sa = (struct sockaddr *) unp->unp_addr;
1096         else
1097                 sa = &sun_noname;
1098         bcopy(sa, *nam, sa->sa_len);
1099         UNP_PCB_UNLOCK(unp);
1100         return (0);
1101 }
1102
1103 static struct pr_usrreqs uipc_usrreqs_dgram = {
1104         .pru_abort =            uipc_abort,
1105         .pru_accept =           uipc_accept,
1106         .pru_attach =           uipc_attach,
1107         .pru_bind =             uipc_bind,
1108         .pru_bindat =           uipc_bindat,
1109         .pru_connect =          uipc_connect,
1110         .pru_connectat =        uipc_connectat,
1111         .pru_connect2 =         uipc_connect2,
1112         .pru_detach =           uipc_detach,
1113         .pru_disconnect =       uipc_disconnect,
1114         .pru_listen =           uipc_listen,
1115         .pru_peeraddr =         uipc_peeraddr,
1116         .pru_rcvd =             uipc_rcvd,
1117         .pru_send =             uipc_send,
1118         .pru_sense =            uipc_sense,
1119         .pru_shutdown =         uipc_shutdown,
1120         .pru_sockaddr =         uipc_sockaddr,
1121         .pru_soreceive =        soreceive_dgram,
1122         .pru_close =            uipc_close,
1123 };
1124
1125 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1126         .pru_abort =            uipc_abort,
1127         .pru_accept =           uipc_accept,
1128         .pru_attach =           uipc_attach,
1129         .pru_bind =             uipc_bind,
1130         .pru_bindat =           uipc_bindat,
1131         .pru_connect =          uipc_connect,
1132         .pru_connectat =        uipc_connectat,
1133         .pru_connect2 =         uipc_connect2,
1134         .pru_detach =           uipc_detach,
1135         .pru_disconnect =       uipc_disconnect,
1136         .pru_listen =           uipc_listen,
1137         .pru_peeraddr =         uipc_peeraddr,
1138         .pru_rcvd =             uipc_rcvd,
1139         .pru_send =             uipc_send,
1140         .pru_sense =            uipc_sense,
1141         .pru_shutdown =         uipc_shutdown,
1142         .pru_sockaddr =         uipc_sockaddr,
1143         .pru_soreceive =        soreceive_generic,      /* XXX: or...? */
1144         .pru_close =            uipc_close,
1145 };
1146
1147 static struct pr_usrreqs uipc_usrreqs_stream = {
1148         .pru_abort =            uipc_abort,
1149         .pru_accept =           uipc_accept,
1150         .pru_attach =           uipc_attach,
1151         .pru_bind =             uipc_bind,
1152         .pru_bindat =           uipc_bindat,
1153         .pru_connect =          uipc_connect,
1154         .pru_connectat =        uipc_connectat,
1155         .pru_connect2 =         uipc_connect2,
1156         .pru_detach =           uipc_detach,
1157         .pru_disconnect =       uipc_disconnect,
1158         .pru_listen =           uipc_listen,
1159         .pru_peeraddr =         uipc_peeraddr,
1160         .pru_rcvd =             uipc_rcvd,
1161         .pru_send =             uipc_send,
1162         .pru_sense =            uipc_sense,
1163         .pru_shutdown =         uipc_shutdown,
1164         .pru_sockaddr =         uipc_sockaddr,
1165         .pru_soreceive =        soreceive_generic,
1166         .pru_close =            uipc_close,
1167 };
1168
1169 static int
1170 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1171 {
1172         struct unpcb *unp;
1173         struct xucred xu;
1174         int error, optval;
1175
1176         if (sopt->sopt_level != 0)
1177                 return (EINVAL);
1178
1179         unp = sotounpcb(so);
1180         KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1181         error = 0;
1182         switch (sopt->sopt_dir) {
1183         case SOPT_GET:
1184                 switch (sopt->sopt_name) {
1185                 case LOCAL_PEERCRED:
1186                         UNP_PCB_LOCK(unp);
1187                         if (unp->unp_flags & UNP_HAVEPC)
1188                                 xu = unp->unp_peercred;
1189                         else {
1190                                 if (so->so_type == SOCK_STREAM)
1191                                         error = ENOTCONN;
1192                                 else
1193                                         error = EINVAL;
1194                         }
1195                         UNP_PCB_UNLOCK(unp);
1196                         if (error == 0)
1197                                 error = sooptcopyout(sopt, &xu, sizeof(xu));
1198                         break;
1199
1200                 case LOCAL_CREDS:
1201                         /* Unlocked read. */
1202                         optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1203                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1204                         break;
1205
1206                 case LOCAL_CONNWAIT:
1207                         /* Unlocked read. */
1208                         optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1209                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1210                         break;
1211
1212                 default:
1213                         error = EOPNOTSUPP;
1214                         break;
1215                 }
1216                 break;
1217
1218         case SOPT_SET:
1219                 switch (sopt->sopt_name) {
1220                 case LOCAL_CREDS:
1221                 case LOCAL_CONNWAIT:
1222                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1223                                             sizeof(optval));
1224                         if (error)
1225                                 break;
1226
1227 #define OPTSET(bit) do {                                                \
1228         UNP_PCB_LOCK(unp);                                              \
1229         if (optval)                                                     \
1230                 unp->unp_flags |= bit;                                  \
1231         else                                                            \
1232                 unp->unp_flags &= ~bit;                                 \
1233         UNP_PCB_UNLOCK(unp);                                            \
1234 } while (0)
1235
1236                         switch (sopt->sopt_name) {
1237                         case LOCAL_CREDS:
1238                                 OPTSET(UNP_WANTCRED);
1239                                 break;
1240
1241                         case LOCAL_CONNWAIT:
1242                                 OPTSET(UNP_CONNWAIT);
1243                                 break;
1244
1245                         default:
1246                                 break;
1247                         }
1248                         break;
1249 #undef  OPTSET
1250                 default:
1251                         error = ENOPROTOOPT;
1252                         break;
1253                 }
1254                 break;
1255
1256         default:
1257                 error = EOPNOTSUPP;
1258                 break;
1259         }
1260         return (error);
1261 }
1262
1263 static int
1264 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1265 {
1266
1267         return (unp_connectat(AT_FDCWD, so, nam, td));
1268 }
1269
1270 static int
1271 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1272     struct thread *td)
1273 {
1274         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1275         struct vnode *vp;
1276         struct socket *so2, *so3;
1277         struct unpcb *unp, *unp2, *unp3;
1278         struct nameidata nd;
1279         char buf[SOCK_MAXADDRLEN];
1280         struct sockaddr *sa;
1281         cap_rights_t rights;
1282         int error, len;
1283
1284         if (nam->sa_family != AF_UNIX)
1285                 return (EAFNOSUPPORT);
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, *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 || cm->cmsg_len < sizeof(*cm)) {
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++, fdp++) {
1910                                 fp = fget_locked(fdesc, *fdp);
1911                                 if (fp == NULL) {
1912                                         FILEDESC_SUNLOCK(fdesc);
1913                                         error = EBADF;
1914                                         goto out;
1915                                 }
1916                                 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1917                                         FILEDESC_SUNLOCK(fdesc);
1918                                         error = EOPNOTSUPP;
1919                                         goto out;
1920                                 }
1921
1922                         }
1923
1924                         /*
1925                          * Now replace the integer FDs with pointers to the
1926                          * file structure and capability rights.
1927                          */
1928                         newlen = oldfds * sizeof(fdep[0]);
1929                         *controlp = sbcreatecontrol(NULL, newlen,
1930                             SCM_RIGHTS, SOL_SOCKET);
1931                         if (*controlp == NULL) {
1932                                 FILEDESC_SUNLOCK(fdesc);
1933                                 error = E2BIG;
1934                                 goto out;
1935                         }
1936                         fdp = data;
1937                         fdep = (struct filedescent **)
1938                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1939                         fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1940                             M_WAITOK);
1941                         for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1942                                 fde = &fdesc->fd_ofiles[*fdp];
1943                                 fdep[i] = fdev;
1944                                 fdep[i]->fde_file = fde->fde_file;
1945                                 filecaps_copy(&fde->fde_caps,
1946                                     &fdep[i]->fde_caps);
1947                                 unp_internalize_fp(fdep[i]->fde_file);
1948                         }
1949                         FILEDESC_SUNLOCK(fdesc);
1950                         break;
1951
1952                 case SCM_TIMESTAMP:
1953                         *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1954                             SCM_TIMESTAMP, SOL_SOCKET);
1955                         if (*controlp == NULL) {
1956                                 error = ENOBUFS;
1957                                 goto out;
1958                         }
1959                         tv = (struct timeval *)
1960                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1961                         microtime(tv);
1962                         break;
1963
1964                 case SCM_BINTIME:
1965                         *controlp = sbcreatecontrol(NULL, sizeof(*bt),
1966                             SCM_BINTIME, SOL_SOCKET);
1967                         if (*controlp == NULL) {
1968                                 error = ENOBUFS;
1969                                 goto out;
1970                         }
1971                         bt = (struct bintime *)
1972                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1973                         bintime(bt);
1974                         break;
1975
1976                 default:
1977                         error = EINVAL;
1978                         goto out;
1979                 }
1980
1981                 controlp = &(*controlp)->m_next;
1982                 if (CMSG_SPACE(datalen) < clen) {
1983                         clen -= CMSG_SPACE(datalen);
1984                         cm = (struct cmsghdr *)
1985                             ((caddr_t)cm + CMSG_SPACE(datalen));
1986                 } else {
1987                         clen = 0;
1988                         cm = NULL;
1989                 }
1990         }
1991
1992 out:
1993         m_freem(control);
1994         return (error);
1995 }
1996
1997 static struct mbuf *
1998 unp_addsockcred(struct thread *td, struct mbuf *control)
1999 {
2000         struct mbuf *m, *n, *n_prev;
2001         struct sockcred *sc;
2002         const struct cmsghdr *cm;
2003         int ngroups;
2004         int i;
2005
2006         ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2007         m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2008         if (m == NULL)
2009                 return (control);
2010
2011         sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2012         sc->sc_uid = td->td_ucred->cr_ruid;
2013         sc->sc_euid = td->td_ucred->cr_uid;
2014         sc->sc_gid = td->td_ucred->cr_rgid;
2015         sc->sc_egid = td->td_ucred->cr_gid;
2016         sc->sc_ngroups = ngroups;
2017         for (i = 0; i < sc->sc_ngroups; i++)
2018                 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2019
2020         /*
2021          * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2022          * created SCM_CREDS control message (struct sockcred) has another
2023          * format.
2024          */
2025         if (control != NULL)
2026                 for (n = control, n_prev = NULL; n != NULL;) {
2027                         cm = mtod(n, struct cmsghdr *);
2028                         if (cm->cmsg_level == SOL_SOCKET &&
2029                             cm->cmsg_type == SCM_CREDS) {
2030                                 if (n_prev == NULL)
2031                                         control = n->m_next;
2032                                 else
2033                                         n_prev->m_next = n->m_next;
2034                                 n = m_free(n);
2035                         } else {
2036                                 n_prev = n;
2037                                 n = n->m_next;
2038                         }
2039                 }
2040
2041         /* Prepend it to the head. */
2042         m->m_next = control;
2043         return (m);
2044 }
2045
2046 static struct unpcb *
2047 fptounp(struct file *fp)
2048 {
2049         struct socket *so;
2050
2051         if (fp->f_type != DTYPE_SOCKET)
2052                 return (NULL);
2053         if ((so = fp->f_data) == NULL)
2054                 return (NULL);
2055         if (so->so_proto->pr_domain != &localdomain)
2056                 return (NULL);
2057         return sotounpcb(so);
2058 }
2059
2060 static void
2061 unp_discard(struct file *fp)
2062 {
2063         struct unp_defer *dr;
2064
2065         if (unp_externalize_fp(fp)) {
2066                 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2067                 dr->ud_fp = fp;
2068                 UNP_DEFERRED_LOCK();
2069                 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2070                 UNP_DEFERRED_UNLOCK();
2071                 atomic_add_int(&unp_defers_count, 1);
2072                 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2073         } else
2074                 (void) closef(fp, (struct thread *)NULL);
2075 }
2076
2077 static void
2078 unp_process_defers(void *arg __unused, int pending)
2079 {
2080         struct unp_defer *dr;
2081         SLIST_HEAD(, unp_defer) drl;
2082         int count;
2083
2084         SLIST_INIT(&drl);
2085         for (;;) {
2086                 UNP_DEFERRED_LOCK();
2087                 if (SLIST_FIRST(&unp_defers) == NULL) {
2088                         UNP_DEFERRED_UNLOCK();
2089                         break;
2090                 }
2091                 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2092                 UNP_DEFERRED_UNLOCK();
2093                 count = 0;
2094                 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2095                         SLIST_REMOVE_HEAD(&drl, ud_link);
2096                         closef(dr->ud_fp, NULL);
2097                         free(dr, M_TEMP);
2098                         count++;
2099                 }
2100                 atomic_add_int(&unp_defers_count, -count);
2101         }
2102 }
2103
2104 static void
2105 unp_internalize_fp(struct file *fp)
2106 {
2107         struct unpcb *unp;
2108
2109         UNP_LINK_WLOCK();
2110         if ((unp = fptounp(fp)) != NULL) {
2111                 unp->unp_file = fp;
2112                 unp->unp_msgcount++;
2113         }
2114         fhold(fp);
2115         unp_rights++;
2116         UNP_LINK_WUNLOCK();
2117 }
2118
2119 static int
2120 unp_externalize_fp(struct file *fp)
2121 {
2122         struct unpcb *unp;
2123         int ret;
2124
2125         UNP_LINK_WLOCK();
2126         if ((unp = fptounp(fp)) != NULL) {
2127                 unp->unp_msgcount--;
2128                 ret = 1;
2129         } else
2130                 ret = 0;
2131         unp_rights--;
2132         UNP_LINK_WUNLOCK();
2133         return (ret);
2134 }
2135
2136 /*
2137  * unp_defer indicates whether additional work has been defered for a future
2138  * pass through unp_gc().  It is thread local and does not require explicit
2139  * synchronization.
2140  */
2141 static int      unp_marked;
2142 static int      unp_unreachable;
2143
2144 static void
2145 unp_accessable(struct filedescent **fdep, int fdcount)
2146 {
2147         struct unpcb *unp;
2148         struct file *fp;
2149         int i;
2150
2151         for (i = 0; i < fdcount; i++) {
2152                 fp = fdep[i]->fde_file;
2153                 if ((unp = fptounp(fp)) == NULL)
2154                         continue;
2155                 if (unp->unp_gcflag & UNPGC_REF)
2156                         continue;
2157                 unp->unp_gcflag &= ~UNPGC_DEAD;
2158                 unp->unp_gcflag |= UNPGC_REF;
2159                 unp_marked++;
2160         }
2161 }
2162
2163 static void
2164 unp_gc_process(struct unpcb *unp)
2165 {
2166         struct socket *soa;
2167         struct socket *so;
2168         struct file *fp;
2169
2170         /* Already processed. */
2171         if (unp->unp_gcflag & UNPGC_SCANNED)
2172                 return;
2173         fp = unp->unp_file;
2174
2175         /*
2176          * Check for a socket potentially in a cycle.  It must be in a
2177          * queue as indicated by msgcount, and this must equal the file
2178          * reference count.  Note that when msgcount is 0 the file is NULL.
2179          */
2180         if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2181             unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2182                 unp->unp_gcflag |= UNPGC_DEAD;
2183                 unp_unreachable++;
2184                 return;
2185         }
2186
2187         /*
2188          * Mark all sockets we reference with RIGHTS.
2189          */
2190         so = unp->unp_socket;
2191         SOCKBUF_LOCK(&so->so_rcv);
2192         unp_scan(so->so_rcv.sb_mb, unp_accessable);
2193         SOCKBUF_UNLOCK(&so->so_rcv);
2194
2195         /*
2196          * Mark all sockets in our accept queue.
2197          */
2198         ACCEPT_LOCK();
2199         TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2200                 SOCKBUF_LOCK(&soa->so_rcv);
2201                 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2202                 SOCKBUF_UNLOCK(&soa->so_rcv);
2203         }
2204         ACCEPT_UNLOCK();
2205         unp->unp_gcflag |= UNPGC_SCANNED;
2206 }
2207
2208 static int unp_recycled;
2209 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2210     "Number of unreachable sockets claimed by the garbage collector.");
2211
2212 static int unp_taskcount;
2213 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2214     "Number of times the garbage collector has run.");
2215
2216 static void
2217 unp_gc(__unused void *arg, int pending)
2218 {
2219         struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2220                                     NULL };
2221         struct unp_head **head;
2222         struct file *f, **unref;
2223         struct unpcb *unp;
2224         int i, total;
2225
2226         unp_taskcount++;
2227         UNP_LIST_LOCK();
2228         /*
2229          * First clear all gc flags from previous runs.
2230          */
2231         for (head = heads; *head != NULL; head++)
2232                 LIST_FOREACH(unp, *head, unp_link)
2233                         unp->unp_gcflag = 0;
2234
2235         /*
2236          * Scan marking all reachable sockets with UNPGC_REF.  Once a socket
2237          * is reachable all of the sockets it references are reachable.
2238          * Stop the scan once we do a complete loop without discovering
2239          * a new reachable socket.
2240          */
2241         do {
2242                 unp_unreachable = 0;
2243                 unp_marked = 0;
2244                 for (head = heads; *head != NULL; head++)
2245                         LIST_FOREACH(unp, *head, unp_link)
2246                                 unp_gc_process(unp);
2247         } while (unp_marked);
2248         UNP_LIST_UNLOCK();
2249         if (unp_unreachable == 0)
2250                 return;
2251
2252         /*
2253          * Allocate space for a local list of dead unpcbs.
2254          */
2255         unref = malloc(unp_unreachable * sizeof(struct file *),
2256             M_TEMP, M_WAITOK);
2257
2258         /*
2259          * Iterate looking for sockets which have been specifically marked
2260          * as as unreachable and store them locally.
2261          */
2262         UNP_LINK_RLOCK();
2263         UNP_LIST_LOCK();
2264         for (total = 0, head = heads; *head != NULL; head++)
2265                 LIST_FOREACH(unp, *head, unp_link)
2266                         if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2267                                 f = unp->unp_file;
2268                                 if (unp->unp_msgcount == 0 || f == NULL ||
2269                                     f->f_count != unp->unp_msgcount)
2270                                         continue;
2271                                 unref[total++] = f;
2272                                 fhold(f);
2273                                 KASSERT(total <= unp_unreachable,
2274                                     ("unp_gc: incorrect unreachable count."));
2275                         }
2276         UNP_LIST_UNLOCK();
2277         UNP_LINK_RUNLOCK();
2278
2279         /*
2280          * Now flush all sockets, free'ing rights.  This will free the
2281          * struct files associated with these sockets but leave each socket
2282          * with one remaining ref.
2283          */
2284         for (i = 0; i < total; i++) {
2285                 struct socket *so;
2286
2287                 so = unref[i]->f_data;
2288                 CURVNET_SET(so->so_vnet);
2289                 sorflush(so);
2290                 CURVNET_RESTORE();
2291         }
2292
2293         /*
2294          * And finally release the sockets so they can be reclaimed.
2295          */
2296         for (i = 0; i < total; i++)
2297                 fdrop(unref[i], NULL);
2298         unp_recycled += total;
2299         free(unref, M_TEMP);
2300 }
2301
2302 static void
2303 unp_dispose(struct mbuf *m)
2304 {
2305
2306         if (m)
2307                 unp_scan(m, unp_freerights);
2308 }
2309
2310 static void
2311 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2312 {
2313         struct mbuf *m;
2314         struct cmsghdr *cm;
2315         void *data;
2316         socklen_t clen, datalen;
2317
2318         while (m0 != NULL) {
2319                 for (m = m0; m; m = m->m_next) {
2320                         if (m->m_type != MT_CONTROL)
2321                                 continue;
2322
2323                         cm = mtod(m, struct cmsghdr *);
2324                         clen = m->m_len;
2325
2326                         while (cm != NULL) {
2327                                 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2328                                         break;
2329
2330                                 data = CMSG_DATA(cm);
2331                                 datalen = (caddr_t)cm + cm->cmsg_len
2332                                     - (caddr_t)data;
2333
2334                                 if (cm->cmsg_level == SOL_SOCKET &&
2335                                     cm->cmsg_type == SCM_RIGHTS) {
2336                                         (*op)(data, datalen /
2337                                             sizeof(struct filedescent *));
2338                                 }
2339
2340                                 if (CMSG_SPACE(datalen) < clen) {
2341                                         clen -= CMSG_SPACE(datalen);
2342                                         cm = (struct cmsghdr *)
2343                                             ((caddr_t)cm + CMSG_SPACE(datalen));
2344                                 } else {
2345                                         clen = 0;
2346                                         cm = NULL;
2347                                 }
2348                         }
2349                 }
2350                 m0 = m0->m_nextpkt;
2351         }
2352 }
2353
2354 /*
2355  * A helper function called by VFS before socket-type vnode reclamation.
2356  * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2357  * use count.
2358  */
2359 void
2360 vfs_unp_reclaim(struct vnode *vp)
2361 {
2362         struct socket *so;
2363         struct unpcb *unp;
2364         int active;
2365
2366         ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2367         KASSERT(vp->v_type == VSOCK,
2368             ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2369
2370         active = 0;
2371         UNP_LINK_WLOCK();
2372         VOP_UNP_CONNECT(vp, &so);
2373         if (so == NULL)
2374                 goto done;
2375         unp = sotounpcb(so);
2376         if (unp == NULL)
2377                 goto done;
2378         UNP_PCB_LOCK(unp);
2379         if (unp->unp_vnode == vp) {
2380                 VOP_UNP_DETACH(vp);
2381                 unp->unp_vnode = NULL;
2382                 active = 1;
2383         }
2384         UNP_PCB_UNLOCK(unp);
2385 done:
2386         UNP_LINK_WUNLOCK();
2387         if (active)
2388                 vunref(vp);
2389 }
2390
2391 #ifdef DDB
2392 static void
2393 db_print_indent(int indent)
2394 {
2395         int i;
2396
2397         for (i = 0; i < indent; i++)
2398                 db_printf(" ");
2399 }
2400
2401 static void
2402 db_print_unpflags(int unp_flags)
2403 {
2404         int comma;
2405
2406         comma = 0;
2407         if (unp_flags & UNP_HAVEPC) {
2408                 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2409                 comma = 1;
2410         }
2411         if (unp_flags & UNP_HAVEPCCACHED) {
2412                 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2413                 comma = 1;
2414         }
2415         if (unp_flags & UNP_WANTCRED) {
2416                 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2417                 comma = 1;
2418         }
2419         if (unp_flags & UNP_CONNWAIT) {
2420                 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2421                 comma = 1;
2422         }
2423         if (unp_flags & UNP_CONNECTING) {
2424                 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2425                 comma = 1;
2426         }
2427         if (unp_flags & UNP_BINDING) {
2428                 db_printf("%sUNP_BINDING", comma ? ", " : "");
2429                 comma = 1;
2430         }
2431 }
2432
2433 static void
2434 db_print_xucred(int indent, struct xucred *xu)
2435 {
2436         int comma, i;
2437
2438         db_print_indent(indent);
2439         db_printf("cr_version: %u   cr_uid: %u   cr_ngroups: %d\n",
2440             xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2441         db_print_indent(indent);
2442         db_printf("cr_groups: ");
2443         comma = 0;
2444         for (i = 0; i < xu->cr_ngroups; i++) {
2445                 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2446                 comma = 1;
2447         }
2448         db_printf("\n");
2449 }
2450
2451 static void
2452 db_print_unprefs(int indent, struct unp_head *uh)
2453 {
2454         struct unpcb *unp;
2455         int counter;
2456
2457         counter = 0;
2458         LIST_FOREACH(unp, uh, unp_reflink) {
2459                 if (counter % 4 == 0)
2460                         db_print_indent(indent);
2461                 db_printf("%p  ", unp);
2462                 if (counter % 4 == 3)
2463                         db_printf("\n");
2464                 counter++;
2465         }
2466         if (counter != 0 && counter % 4 != 0)
2467                 db_printf("\n");
2468 }
2469
2470 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2471 {
2472         struct unpcb *unp;
2473
2474         if (!have_addr) {
2475                 db_printf("usage: show unpcb <addr>\n");
2476                 return;
2477         }
2478         unp = (struct unpcb *)addr;
2479
2480         db_printf("unp_socket: %p   unp_vnode: %p\n", unp->unp_socket,
2481             unp->unp_vnode);
2482
2483         db_printf("unp_ino: %ju   unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2484             unp->unp_conn);
2485
2486         db_printf("unp_refs:\n");
2487         db_print_unprefs(2, &unp->unp_refs);
2488
2489         /* XXXRW: Would be nice to print the full address, if any. */
2490         db_printf("unp_addr: %p\n", unp->unp_addr);
2491
2492         db_printf("unp_gencnt: %llu\n",
2493             (unsigned long long)unp->unp_gencnt);
2494
2495         db_printf("unp_flags: %x (", unp->unp_flags);
2496         db_print_unpflags(unp->unp_flags);
2497         db_printf(")\n");
2498
2499         db_printf("unp_peercred:\n");
2500         db_print_xucred(2, &unp->unp_peercred);
2501
2502         db_printf("unp_refcount: %u\n", unp->unp_refcount);
2503 }
2504 #endif