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, ("%s: unp == NULL", __func__));
 797         KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
 798             ("%s: socktype %d", __func__, so->so_type));
 799
 800         /*
 801          * Adjust backpressure on sender and wakeup any waiting to write.
 802          *
 803          * The unp lock is acquired to maintain the validity of the unp_conn
 804          * pointer; no lock on unp2 is required as unp2->unp_socket will be
 805          * static as long as we don't permit unp2 to disconnect from unp,
 806          * which is prevented by the lock on unp.  We cache values from
 807          * so_rcv to avoid holding the so_rcv lock over the entire
 808          * transaction on the remote so_snd.
 809          */
 810         SOCKBUF_LOCK(&so->so_rcv);
 811         mbcnt = so->so_rcv.sb_mbcnt;
 812         sbcc = sbavail(&so->so_rcv);
 813         SOCKBUF_UNLOCK(&so->so_rcv);
 814         /*
 815          * There is a benign race condition at this point.  If we're planning to
 816          * clear SB_STOP, but uipc_send is called on the connected socket at
 817          * this instant, it might add data to the sockbuf and set SB_STOP.  Then
 818          * we would erroneously clear SB_STOP below, even though the sockbuf is
 819          * full.  The race is benign because the only ill effect is to allow the
 820          * sockbuf to exceed its size limit, and the size limits are not
 821          * strictly guaranteed anyway.
 822          */
 823         UNP_PCB_LOCK(unp);
 824         unp2 = unp->unp_conn;
 825         if (unp2 == NULL) {
 826                 UNP_PCB_UNLOCK(unp);
 827                 return (0);
 828         }
 829         so2 = unp2->unp_socket;
 830         SOCKBUF_LOCK(&so2->so_snd);
 831         if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
 832                 so2->so_snd.sb_flags &= ~SB_STOP;
 833         sowwakeup_locked(so2);
 834         UNP_PCB_UNLOCK(unp);
 835         return (0);
 836 }
 837
 838 static int
 839 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 840     struct mbuf *control, struct thread *td)
 841 {
 842         struct unpcb *unp, *unp2;
 843         struct socket *so2;
 844         u_int mbcnt, sbcc;
 845         int error = 0;
 846
 847         unp = sotounpcb(so);
 848         KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
 849         KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_DGRAM ||
 850             so->so_type == SOCK_SEQPACKET,
 851             ("%s: socktype %d", __func__, so->so_type));
 852
 853         if (flags & PRUS_OOB) {
 854                 error = EOPNOTSUPP;
 855                 goto release;
 856         }
 857         if (control != NULL && (error = unp_internalize(&control, td)))
 858                 goto release;
 859         if ((nam != NULL) || (flags & PRUS_EOF))
 860                 UNP_LINK_WLOCK();
 861         else
 862                 UNP_LINK_RLOCK();
 863         switch (so->so_type) {
 864         case SOCK_DGRAM:
 865         {
 866                 const struct sockaddr *from;
 867
 868                 unp2 = unp->unp_conn;
 869                 if (nam != NULL) {
 870                         UNP_LINK_WLOCK_ASSERT();
 871                         if (unp2 != NULL) {
 872                                 error = EISCONN;
 873                                 break;
 874                         }
 875                         error = unp_connect(so, nam, td);
 876                         if (error)
 877                                 break;
 878                         unp2 = unp->unp_conn;
 879                 }
 880
 881                 /*
 882                  * Because connect() and send() are non-atomic in a sendto()
 883                  * with a target address, it's possible that the socket will
 884                  * have disconnected before the send() can run.  In that case
 885                  * return the slightly counter-intuitive but otherwise
 886                  * correct error that the socket is not connected.
 887                  */
 888                 if (unp2 == NULL) {
 889                         error = ENOTCONN;
 890                         break;
 891                 }
 892                 /* Lockless read. */
 893                 if (unp2->unp_flags & UNP_WANTCRED)
 894                         control = unp_addsockcred(td, control);
 895                 UNP_PCB_LOCK(unp);
 896                 if (unp->unp_addr != NULL)
 897                         from = (struct sockaddr *)unp->unp_addr;
 898                 else
 899                         from = &sun_noname;
 900                 so2 = unp2->unp_socket;
 901                 SOCKBUF_LOCK(&so2->so_rcv);
 902                 if (sbappendaddr_locked(&so2->so_rcv, from, m,
 903                     control)) {
 904                         sorwakeup_locked(so2);
 905                         m = NULL;
 906                         control = NULL;
 907                 } else {
 908                         SOCKBUF_UNLOCK(&so2->so_rcv);
 909                         error = ENOBUFS;
 910                 }
 911                 if (nam != NULL) {
 912                         UNP_LINK_WLOCK_ASSERT();
 913                         UNP_PCB_LOCK(unp2);
 914                         unp_disconnect(unp, unp2);
 915                         UNP_PCB_UNLOCK(unp2);
 916                 }
 917                 UNP_PCB_UNLOCK(unp);
 918                 break;
 919         }
 920
 921         case SOCK_SEQPACKET:
 922         case SOCK_STREAM:
 923                 if ((so->so_state & SS_ISCONNECTED) == 0) {
 924                         if (nam != NULL) {
 925                                 UNP_LINK_WLOCK_ASSERT();
 926                                 error = unp_connect(so, nam, td);
 927                                 if (error)
 928                                         break;  /* XXX */
 929                         } else {
 930                                 error = ENOTCONN;
 931                                 break;
 932                         }
 933                 }
 934
 935                 /* Lockless read. */
 936                 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
 937                         error = EPIPE;
 938                         break;
 939                 }
 940
 941                 /*
 942                  * Because connect() and send() are non-atomic in a sendto()
 943                  * with a target address, it's possible that the socket will
 944                  * have disconnected before the send() can run.  In that case
 945                  * return the slightly counter-intuitive but otherwise
 946                  * correct error that the socket is not connected.
 947                  *
 948                  * Locking here must be done carefully: the linkage lock
 949                  * prevents interconnections between unpcbs from changing, so
 950                  * we can traverse from unp to unp2 without acquiring unp's
 951                  * lock.  Socket buffer locks follow unpcb locks, so we can
 952                  * acquire both remote and lock socket buffer locks.
 953                  */
 954                 unp2 = unp->unp_conn;
 955                 if (unp2 == NULL) {
 956                         error = ENOTCONN;
 957                         break;
 958                 }
 959                 so2 = unp2->unp_socket;
 960                 UNP_PCB_LOCK(unp2);
 961                 SOCKBUF_LOCK(&so2->so_rcv);
 962                 if (unp2->unp_flags & UNP_WANTCRED) {
 963                         /*
 964                          * Credentials are passed only once on SOCK_STREAM
 965                          * and SOCK_SEQPACKET.
 966                          */
 967                         unp2->unp_flags &= ~UNP_WANTCRED;
 968                         control = unp_addsockcred(td, control);
 969                 }
 970                 /*
 971                  * Send to paired receive port, and then reduce send buffer
 972                  * hiwater marks to maintain backpressure.  Wake up readers.
 973                  */
 974                 switch (so->so_type) {
 975                 case SOCK_STREAM:
 976                         if (control != NULL) {
 977                                 if (sbappendcontrol_locked(&so2->so_rcv, m,
 978                                     control))
 979                                         control = NULL;
 980                         } else
 981                                 sbappend_locked(&so2->so_rcv, m);
 982                         break;
 983
 984                 case SOCK_SEQPACKET: {
 985                         const struct sockaddr *from;
 986
 987                         from = &sun_noname;
 988                         /*
 989                          * Don't check for space available in so2->so_rcv.
 990                          * Unix domain sockets only check for space in the
 991                          * sending sockbuf, and that check is performed one
 992                          * level up the stack.
 993                          */
 994                         if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
 995                                 from, m, control))
 996                                 control = NULL;
 997                         break;
 998                         }
 999                 }
1000
1001                 mbcnt = so2->so_rcv.sb_mbcnt;
1002                 sbcc = sbavail(&so2->so_rcv);
1003                 if (sbcc)
1004                         sorwakeup_locked(so2);
1005                 else
1006                         SOCKBUF_UNLOCK(&so2->so_rcv);
1007
1008                 /*
1009                  * The PCB lock on unp2 protects the SB_STOP flag.  Without it,
1010                  * it would be possible for uipc_rcvd to be called at this
1011                  * point, drain the receiving sockbuf, clear SB_STOP, and then
1012                  * we would set SB_STOP below.  That could lead to an empty
1013                  * sockbuf having SB_STOP set
1014                  */
1015                 SOCKBUF_LOCK(&so->so_snd);
1016                 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1017                         so->so_snd.sb_flags |= SB_STOP;
1018                 SOCKBUF_UNLOCK(&so->so_snd);
1019                 UNP_PCB_UNLOCK(unp2);
1020                 m = NULL;
1021                 break;
1022         }
1023
1024         /*
1025          * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1026          */
1027         if (flags & PRUS_EOF) {
1028                 UNP_PCB_LOCK(unp);
1029                 socantsendmore(so);
1030                 unp_shutdown(unp);
1031                 UNP_PCB_UNLOCK(unp);
1032         }
1033
1034         if ((nam != NULL) || (flags & PRUS_EOF))
1035                 UNP_LINK_WUNLOCK();
1036         else
1037                 UNP_LINK_RUNLOCK();
1038
1039         if (control != NULL && error != 0)
1040                 unp_dispose(control);
1041
1042 release:
1043         if (control != NULL)
1044                 m_freem(control);
1045         if (m != NULL)
1046                 m_freem(m);
1047         return (error);
1048 }
1049
1050 static int
1051 uipc_ready(struct socket *so, struct mbuf *m, int count)
1052 {
1053         struct unpcb *unp, *unp2;
1054         struct socket *so2;
1055         int error;
1056
1057         unp = sotounpcb(so);
1058
1059         UNP_LINK_RLOCK();
1060         unp2 = unp->unp_conn;
1061         UNP_PCB_LOCK(unp2);
1062         so2 = unp2->unp_socket;
1063
1064         SOCKBUF_LOCK(&so2->so_rcv);
1065         if ((error = sbready(&so2->so_rcv, m, count)) == 0)
1066                 sorwakeup_locked(so2);
1067         else
1068                 SOCKBUF_UNLOCK(&so2->so_rcv);
1069
1070         UNP_PCB_UNLOCK(unp2);
1071         UNP_LINK_RUNLOCK();
1072
1073         return (error);
1074 }
1075
1076 static int
1077 uipc_sense(struct socket *so, struct stat *sb)
1078 {
1079         struct unpcb *unp;
1080
1081         unp = sotounpcb(so);
1082         KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1083
1084         sb->st_blksize = so->so_snd.sb_hiwat;
1085         UNP_PCB_LOCK(unp);
1086         sb->st_dev = NODEV;
1087         if (unp->unp_ino == 0)
1088                 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1089         sb->st_ino = unp->unp_ino;
1090         UNP_PCB_UNLOCK(unp);
1091         return (0);
1092 }
1093
1094 static int
1095 uipc_shutdown(struct socket *so)
1096 {
1097         struct unpcb *unp;
1098
1099         unp = sotounpcb(so);
1100         KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1101
1102         UNP_LINK_WLOCK();
1103         UNP_PCB_LOCK(unp);
1104         socantsendmore(so);
1105         unp_shutdown(unp);
1106         UNP_PCB_UNLOCK(unp);
1107         UNP_LINK_WUNLOCK();
1108         return (0);
1109 }
1110
1111 static int
1112 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1113 {
1114         struct unpcb *unp;
1115         const struct sockaddr *sa;
1116
1117         unp = sotounpcb(so);
1118         KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1119
1120         *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1121         UNP_PCB_LOCK(unp);
1122         if (unp->unp_addr != NULL)
1123                 sa = (struct sockaddr *) unp->unp_addr;
1124         else
1125                 sa = &sun_noname;
1126         bcopy(sa, *nam, sa->sa_len);
1127         UNP_PCB_UNLOCK(unp);
1128         return (0);
1129 }
1130
1131 static struct pr_usrreqs uipc_usrreqs_dgram = {
1132         .pru_abort =            uipc_abort,
1133         .pru_accept =           uipc_accept,
1134         .pru_attach =           uipc_attach,
1135         .pru_bind =             uipc_bind,
1136         .pru_bindat =           uipc_bindat,
1137         .pru_connect =          uipc_connect,
1138         .pru_connectat =        uipc_connectat,
1139         .pru_connect2 =         uipc_connect2,
1140         .pru_detach =           uipc_detach,
1141         .pru_disconnect =       uipc_disconnect,
1142         .pru_listen =           uipc_listen,
1143         .pru_peeraddr =         uipc_peeraddr,
1144         .pru_rcvd =             uipc_rcvd,
1145         .pru_send =             uipc_send,
1146         .pru_sense =            uipc_sense,
1147         .pru_shutdown =         uipc_shutdown,
1148         .pru_sockaddr =         uipc_sockaddr,
1149         .pru_soreceive =        soreceive_dgram,
1150         .pru_close =            uipc_close,
1151 };
1152
1153 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1154         .pru_abort =            uipc_abort,
1155         .pru_accept =           uipc_accept,
1156         .pru_attach =           uipc_attach,
1157         .pru_bind =             uipc_bind,
1158         .pru_bindat =           uipc_bindat,
1159         .pru_connect =          uipc_connect,
1160         .pru_connectat =        uipc_connectat,
1161         .pru_connect2 =         uipc_connect2,
1162         .pru_detach =           uipc_detach,
1163         .pru_disconnect =       uipc_disconnect,
1164         .pru_listen =           uipc_listen,
1165         .pru_peeraddr =         uipc_peeraddr,
1166         .pru_rcvd =             uipc_rcvd,
1167         .pru_send =             uipc_send,
1168         .pru_sense =            uipc_sense,
1169         .pru_shutdown =         uipc_shutdown,
1170         .pru_sockaddr =         uipc_sockaddr,
1171         .pru_soreceive =        soreceive_generic,      /* XXX: or...? */
1172         .pru_close =            uipc_close,
1173 };
1174
1175 static struct pr_usrreqs uipc_usrreqs_stream = {
1176         .pru_abort =            uipc_abort,
1177         .pru_accept =           uipc_accept,
1178         .pru_attach =           uipc_attach,
1179         .pru_bind =             uipc_bind,
1180         .pru_bindat =           uipc_bindat,
1181         .pru_connect =          uipc_connect,
1182         .pru_connectat =        uipc_connectat,
1183         .pru_connect2 =         uipc_connect2,
1184         .pru_detach =           uipc_detach,
1185         .pru_disconnect =       uipc_disconnect,
1186         .pru_listen =           uipc_listen,
1187         .pru_peeraddr =         uipc_peeraddr,
1188         .pru_rcvd =             uipc_rcvd,
1189         .pru_send =             uipc_send,
1190         .pru_ready =            uipc_ready,
1191         .pru_sense =            uipc_sense,
1192         .pru_shutdown =         uipc_shutdown,
1193         .pru_sockaddr =         uipc_sockaddr,
1194         .pru_soreceive =        soreceive_generic,
1195         .pru_close =            uipc_close,
1196 };
1197
1198 static int
1199 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1200 {
1201         struct unpcb *unp;
1202         struct xucred xu;
1203         int error, optval;
1204
1205         if (sopt->sopt_level != 0)
1206                 return (EINVAL);
1207
1208         unp = sotounpcb(so);
1209         KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1210         error = 0;
1211         switch (sopt->sopt_dir) {
1212         case SOPT_GET:
1213                 switch (sopt->sopt_name) {
1214                 case LOCAL_PEERCRED:
1215                         UNP_PCB_LOCK(unp);
1216                         if (unp->unp_flags & UNP_HAVEPC)
1217                                 xu = unp->unp_peercred;
1218                         else {
1219                                 if (so->so_type == SOCK_STREAM)
1220                                         error = ENOTCONN;
1221                                 else
1222                                         error = EINVAL;
1223                         }
1224                         UNP_PCB_UNLOCK(unp);
1225                         if (error == 0)
1226                                 error = sooptcopyout(sopt, &xu, sizeof(xu));
1227                         break;
1228
1229                 case LOCAL_CREDS:
1230                         /* Unlocked read. */
1231                         optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1232                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1233                         break;
1234
1235                 case LOCAL_CONNWAIT:
1236                         /* Unlocked read. */
1237                         optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1238                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1239                         break;
1240
1241                 default:
1242                         error = EOPNOTSUPP;
1243                         break;
1244                 }
1245                 break;
1246
1247         case SOPT_SET:
1248                 switch (sopt->sopt_name) {
1249                 case LOCAL_CREDS:
1250                 case LOCAL_CONNWAIT:
1251                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1252                                             sizeof(optval));
1253                         if (error)
1254                                 break;
1255
1256 #define OPTSET(bit) do {                                                \
1257         UNP_PCB_LOCK(unp);                                              \
1258         if (optval)                                                     \
1259                 unp->unp_flags |= bit;                                  \
1260         else                                                            \
1261                 unp->unp_flags &= ~bit;                                 \
1262         UNP_PCB_UNLOCK(unp);                                            \
1263 } while (0)
1264
1265                         switch (sopt->sopt_name) {
1266                         case LOCAL_CREDS:
1267                                 OPTSET(UNP_WANTCRED);
1268                                 break;
1269
1270                         case LOCAL_CONNWAIT:
1271                                 OPTSET(UNP_CONNWAIT);
1272                                 break;
1273
1274                         default:
1275                                 break;
1276                         }
1277                         break;
1278 #undef  OPTSET
1279                 default:
1280                         error = ENOPROTOOPT;
1281                         break;
1282                 }
1283                 break;
1284
1285         default:
1286                 error = EOPNOTSUPP;
1287                 break;
1288         }
1289         return (error);
1290 }
1291
1292 static int
1293 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1294 {
1295
1296         return (unp_connectat(AT_FDCWD, so, nam, td));
1297 }
1298
1299 static int
1300 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1301     struct thread *td)
1302 {
1303         struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1304         struct vnode *vp;
1305         struct socket *so2, *so3;
1306         struct unpcb *unp, *unp2, *unp3;
1307         struct nameidata nd;
1308         char buf[SOCK_MAXADDRLEN];
1309         struct sockaddr *sa;
1310         cap_rights_t rights;
1311         int error, len;
1312
1313         if (nam->sa_family != AF_UNIX)
1314                 return (EAFNOSUPPORT);
1315
1316         UNP_LINK_WLOCK_ASSERT();
1317
1318         unp = sotounpcb(so);
1319         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1320
1321         if (nam->sa_len > sizeof(struct sockaddr_un))
1322                 return (EINVAL);
1323         len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1324         if (len <= 0)
1325                 return (EINVAL);
1326         bcopy(soun->sun_path, buf, len);
1327         buf[len] = 0;
1328
1329         UNP_PCB_LOCK(unp);
1330         if (unp->unp_flags & UNP_CONNECTING) {
1331                 UNP_PCB_UNLOCK(unp);
1332                 return (EALREADY);
1333         }
1334         UNP_LINK_WUNLOCK();
1335         unp->unp_flags |= UNP_CONNECTING;
1336         UNP_PCB_UNLOCK(unp);
1337
1338         sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1339         NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1340             UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1341         error = namei(&nd);
1342         if (error)
1343                 vp = NULL;
1344         else
1345                 vp = nd.ni_vp;
1346         ASSERT_VOP_LOCKED(vp, "unp_connect");
1347         NDFREE(&nd, NDF_ONLY_PNBUF);
1348         if (error)
1349                 goto bad;
1350
1351         if (vp->v_type != VSOCK) {
1352                 error = ENOTSOCK;
1353                 goto bad;
1354         }
1355 #ifdef MAC
1356         error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1357         if (error)
1358                 goto bad;
1359 #endif
1360         error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1361         if (error)
1362                 goto bad;
1363
1364         unp = sotounpcb(so);
1365         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1366
1367         /*
1368          * Lock linkage lock for two reasons: make sure v_socket is stable,
1369          * and to protect simultaneous locking of multiple pcbs.
1370          */
1371         UNP_LINK_WLOCK();
1372         VOP_UNP_CONNECT(vp, &so2);
1373         if (so2 == NULL) {
1374                 error = ECONNREFUSED;
1375                 goto bad2;
1376         }
1377         if (so->so_type != so2->so_type) {
1378                 error = EPROTOTYPE;
1379                 goto bad2;
1380         }
1381         if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1382                 if (so2->so_options & SO_ACCEPTCONN) {
1383                         CURVNET_SET(so2->so_vnet);
1384                         so3 = sonewconn(so2, 0);
1385                         CURVNET_RESTORE();
1386                 } else
1387                         so3 = NULL;
1388                 if (so3 == NULL) {
1389                         error = ECONNREFUSED;
1390                         goto bad2;
1391                 }
1392                 unp = sotounpcb(so);
1393                 unp2 = sotounpcb(so2);
1394                 unp3 = sotounpcb(so3);
1395                 UNP_PCB_LOCK(unp);
1396                 UNP_PCB_LOCK(unp2);
1397                 UNP_PCB_LOCK(unp3);
1398                 if (unp2->unp_addr != NULL) {
1399                         bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1400                         unp3->unp_addr = (struct sockaddr_un *) sa;
1401                         sa = NULL;
1402                 }
1403
1404                 /*
1405                  * The connector's (client's) credentials are copied from its
1406                  * process structure at the time of connect() (which is now).
1407                  */
1408                 cru2x(td->td_ucred, &unp3->unp_peercred);
1409                 unp3->unp_flags |= UNP_HAVEPC;
1410
1411                 /*
1412                  * The receiver's (server's) credentials are copied from the
1413                  * unp_peercred member of socket on which the former called
1414                  * listen(); uipc_listen() cached that process's credentials
1415                  * at that time so we can use them now.
1416                  */
1417                 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1418                     ("unp_connect: listener without cached peercred"));
1419                 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1420                     sizeof(unp->unp_peercred));
1421                 unp->unp_flags |= UNP_HAVEPC;
1422                 if (unp2->unp_flags & UNP_WANTCRED)
1423                         unp3->unp_flags |= UNP_WANTCRED;
1424                 UNP_PCB_UNLOCK(unp3);
1425                 UNP_PCB_UNLOCK(unp2);
1426                 UNP_PCB_UNLOCK(unp);
1427 #ifdef MAC
1428                 mac_socketpeer_set_from_socket(so, so3);
1429                 mac_socketpeer_set_from_socket(so3, so);
1430 #endif
1431
1432                 so2 = so3;
1433         }
1434         unp = sotounpcb(so);
1435         KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1436         unp2 = sotounpcb(so2);
1437         KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1438         UNP_PCB_LOCK(unp);
1439         UNP_PCB_LOCK(unp2);
1440         error = unp_connect2(so, so2, PRU_CONNECT);
1441         UNP_PCB_UNLOCK(unp2);
1442         UNP_PCB_UNLOCK(unp);
1443 bad2:
1444         UNP_LINK_WUNLOCK();
1445 bad:
1446         if (vp != NULL)
1447                 vput(vp);
1448         free(sa, M_SONAME);
1449         UNP_LINK_WLOCK();
1450         UNP_PCB_LOCK(unp);
1451         unp->unp_flags &= ~UNP_CONNECTING;
1452         UNP_PCB_UNLOCK(unp);
1453         return (error);
1454 }
1455
1456 static int
1457 unp_connect2(struct socket *so, struct socket *so2, int req)
1458 {
1459         struct unpcb *unp;
1460         struct unpcb *unp2;
1461
1462         unp = sotounpcb(so);
1463         KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1464         unp2 = sotounpcb(so2);
1465         KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1466
1467         UNP_LINK_WLOCK_ASSERT();
1468         UNP_PCB_LOCK_ASSERT(unp);
1469         UNP_PCB_LOCK_ASSERT(unp2);
1470
1471         if (so2->so_type != so->so_type)
1472                 return (EPROTOTYPE);
1473         unp->unp_conn = unp2;
1474
1475         switch (so->so_type) {
1476         case SOCK_DGRAM:
1477                 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1478                 soisconnected(so);
1479                 break;
1480
1481         case SOCK_STREAM:
1482         case SOCK_SEQPACKET:
1483                 unp2->unp_conn = unp;
1484                 if (req == PRU_CONNECT &&
1485                     ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1486                         soisconnecting(so);
1487                 else
1488                         soisconnected(so);
1489                 soisconnected(so2);
1490                 break;
1491
1492         default:
1493                 panic("unp_connect2");
1494         }
1495         return (0);
1496 }
1497
1498 static void
1499 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1500 {
1501         struct socket *so;
1502
1503         KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1504
1505         UNP_LINK_WLOCK_ASSERT();
1506         UNP_PCB_LOCK_ASSERT(unp);
1507         UNP_PCB_LOCK_ASSERT(unp2);
1508
1509         unp->unp_conn = NULL;
1510         switch (unp->unp_socket->so_type) {
1511         case SOCK_DGRAM:
1512                 LIST_REMOVE(unp, unp_reflink);
1513                 so = unp->unp_socket;
1514                 SOCK_LOCK(so);
1515                 so->so_state &= ~SS_ISCONNECTED;
1516                 SOCK_UNLOCK(so);
1517                 break;
1518
1519         case SOCK_STREAM:
1520         case SOCK_SEQPACKET:
1521                 soisdisconnected(unp->unp_socket);
1522                 unp2->unp_conn = NULL;
1523                 soisdisconnected(unp2->unp_socket);
1524                 break;
1525         }
1526 }
1527
1528 /*
1529  * unp_pcblist() walks the global list of struct unpcb's to generate a
1530  * pointer list, bumping the refcount on each unpcb.  It then copies them out
1531  * sequentially, validating the generation number on each to see if it has
1532  * been detached.  All of this is necessary because copyout() may sleep on
1533  * disk I/O.
1534  */
1535 static int
1536 unp_pcblist(SYSCTL_HANDLER_ARGS)
1537 {
1538         int error, i, n;
1539         int freeunp;
1540         struct unpcb *unp, **unp_list;
1541         unp_gen_t gencnt;
1542         struct xunpgen *xug;
1543         struct unp_head *head;
1544         struct xunpcb *xu;
1545
1546         switch ((intptr_t)arg1) {
1547         case SOCK_STREAM:
1548                 head = &unp_shead;
1549                 break;
1550
1551         case SOCK_DGRAM:
1552                 head = &unp_dhead;
1553                 break;
1554
1555         case SOCK_SEQPACKET:
1556                 head = &unp_sphead;
1557                 break;
1558
1559         default:
1560                 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1561         }
1562
1563         /*
1564          * The process of preparing the PCB list is too time-consuming and
1565          * resource-intensive to repeat twice on every request.
1566          */
1567         if (req->oldptr == NULL) {
1568                 n = unp_count;
1569                 req->oldidx = 2 * (sizeof *xug)
1570                         + (n + n/8) * sizeof(struct xunpcb);
1571                 return (0);
1572         }
1573
1574         if (req->newptr != NULL)
1575                 return (EPERM);
1576
1577         /*
1578          * OK, now we're committed to doing something.
1579          */
1580         xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1581         UNP_LIST_LOCK();
1582         gencnt = unp_gencnt;
1583         n = unp_count;
1584         UNP_LIST_UNLOCK();
1585
1586         xug->xug_len = sizeof *xug;
1587         xug->xug_count = n;
1588         xug->xug_gen = gencnt;
1589         xug->xug_sogen = so_gencnt;
1590         error = SYSCTL_OUT(req, xug, sizeof *xug);
1591         if (error) {
1592                 free(xug, M_TEMP);
1593                 return (error);
1594         }
1595
1596         unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1597
1598         UNP_LIST_LOCK();
1599         for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1600              unp = LIST_NEXT(unp, unp_link)) {
1601                 UNP_PCB_LOCK(unp);
1602                 if (unp->unp_gencnt <= gencnt) {
1603                         if (cr_cansee(req->td->td_ucred,
1604                             unp->unp_socket->so_cred)) {
1605                                 UNP_PCB_UNLOCK(unp);
1606                                 continue;
1607                         }
1608                         unp_list[i++] = unp;
1609                         unp->unp_refcount++;
1610                 }
1611                 UNP_PCB_UNLOCK(unp);
1612         }
1613         UNP_LIST_UNLOCK();
1614         n = i;                  /* In case we lost some during malloc. */
1615
1616         error = 0;
1617         xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1618         for (i = 0; i < n; i++) {
1619                 unp = unp_list[i];
1620                 UNP_PCB_LOCK(unp);
1621                 unp->unp_refcount--;
1622                 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1623                         xu->xu_len = sizeof *xu;
1624                         xu->xu_unpp = unp;
1625                         /*
1626                          * XXX - need more locking here to protect against
1627                          * connect/disconnect races for SMP.
1628                          */
1629                         if (unp->unp_addr != NULL)
1630                                 bcopy(unp->unp_addr, &xu->xu_addr,
1631                                       unp->unp_addr->sun_len);
1632                         if (unp->unp_conn != NULL &&
1633                             unp->unp_conn->unp_addr != NULL)
1634                                 bcopy(unp->unp_conn->unp_addr,
1635                                       &xu->xu_caddr,
1636                                       unp->unp_conn->unp_addr->sun_len);
1637                         bcopy(unp, &xu->xu_unp, sizeof *unp);
1638                         sotoxsocket(unp->unp_socket, &xu->xu_socket);
1639                         UNP_PCB_UNLOCK(unp);
1640                         error = SYSCTL_OUT(req, xu, sizeof *xu);
1641                 } else {
1642                         freeunp = (unp->unp_refcount == 0);
1643                         UNP_PCB_UNLOCK(unp);
1644                         if (freeunp) {
1645                                 UNP_PCB_LOCK_DESTROY(unp);
1646                                 uma_zfree(unp_zone, unp);
1647                         }
1648                 }
1649         }
1650         free(xu, M_TEMP);
1651         if (!error) {
1652                 /*
1653                  * Give the user an updated idea of our state.  If the
1654                  * generation differs from what we told her before, she knows
1655                  * that something happened while we were processing this
1656                  * request, and it might be necessary to retry.
1657                  */
1658                 xug->xug_gen = unp_gencnt;
1659                 xug->xug_sogen = so_gencnt;
1660                 xug->xug_count = unp_count;
1661                 error = SYSCTL_OUT(req, xug, sizeof *xug);
1662         }
1663         free(unp_list, M_TEMP);
1664         free(xug, M_TEMP);
1665         return (error);
1666 }
1667
1668 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1669     (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1670     "List of active local datagram sockets");
1671 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1672     (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1673     "List of active local stream sockets");
1674 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1675     CTLTYPE_OPAQUE | CTLFLAG_RD,
1676     (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1677     "List of active local seqpacket sockets");
1678
1679 static void
1680 unp_shutdown(struct unpcb *unp)
1681 {
1682         struct unpcb *unp2;
1683         struct socket *so;
1684
1685         UNP_LINK_WLOCK_ASSERT();
1686         UNP_PCB_LOCK_ASSERT(unp);
1687
1688         unp2 = unp->unp_conn;
1689         if ((unp->unp_socket->so_type == SOCK_STREAM ||
1690             (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1691                 so = unp2->unp_socket;
1692                 if (so != NULL)
1693                         socantrcvmore(so);
1694         }
1695 }
1696
1697 static void
1698 unp_drop(struct unpcb *unp, int errno)
1699 {
1700         struct socket *so = unp->unp_socket;
1701         struct unpcb *unp2;
1702
1703         UNP_LINK_WLOCK_ASSERT();
1704         UNP_PCB_LOCK_ASSERT(unp);
1705
1706         so->so_error = errno;
1707         unp2 = unp->unp_conn;
1708         if (unp2 == NULL)
1709                 return;
1710         UNP_PCB_LOCK(unp2);
1711         unp_disconnect(unp, unp2);
1712         UNP_PCB_UNLOCK(unp2);
1713 }
1714
1715 static void
1716 unp_freerights(struct filedescent **fdep, int fdcount)
1717 {
1718         struct file *fp;
1719         int i;
1720
1721         KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1722
1723         for (i = 0; i < fdcount; i++) {
1724                 fp = fdep[i]->fde_file;
1725                 filecaps_free(&fdep[i]->fde_caps);
1726                 unp_discard(fp);
1727         }
1728         free(fdep[0], M_FILECAPS);
1729 }
1730
1731 static int
1732 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1733 {
1734         struct thread *td = curthread;          /* XXX */
1735         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1736         int i;
1737         int *fdp;
1738         struct filedesc *fdesc = td->td_proc->p_fd;
1739         struct filedescent *fde, **fdep;
1740         void *data;
1741         socklen_t clen = control->m_len, datalen;
1742         int error, newfds;
1743         u_int newlen;
1744
1745         UNP_LINK_UNLOCK_ASSERT();
1746
1747         error = 0;
1748         if (controlp != NULL) /* controlp == NULL => free control messages */
1749                 *controlp = NULL;
1750         while (cm != NULL) {
1751                 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1752                         error = EINVAL;
1753                         break;
1754                 }
1755                 data = CMSG_DATA(cm);
1756                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1757                 if (cm->cmsg_level == SOL_SOCKET
1758                     && cm->cmsg_type == SCM_RIGHTS) {
1759                         newfds = datalen / sizeof(*fdep);
1760                         if (newfds == 0)
1761                                 goto next;
1762                         fdep = data;
1763
1764                         /* If we're not outputting the descriptors free them. */
1765                         if (error || controlp == NULL) {
1766                                 unp_freerights(fdep, newfds);
1767                                 goto next;
1768                         }
1769                         FILEDESC_XLOCK(fdesc);
1770
1771                         /*
1772                          * Now change each pointer to an fd in the global
1773                          * table to an integer that is the index to the local
1774                          * fd table entry that we set up to point to the
1775                          * global one we are transferring.
1776                          */
1777                         newlen = newfds * sizeof(int);
1778                         *controlp = sbcreatecontrol(NULL, newlen,
1779                             SCM_RIGHTS, SOL_SOCKET);
1780                         if (*controlp == NULL) {
1781                                 FILEDESC_XUNLOCK(fdesc);
1782                                 error = E2BIG;
1783                                 unp_freerights(fdep, newfds);
1784                                 goto next;
1785                         }
1786
1787                         fdp = (int *)
1788                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1789                         if (fdallocn(td, 0, fdp, newfds) != 0) {
1790                                 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1791                                 error = EMSGSIZE;
1792                                 unp_freerights(fdep, newfds);
1793                                 m_freem(*controlp);
1794                                 *controlp = NULL;
1795                                 goto next;
1796                         }
1797                         for (i = 0; i < newfds; i++, fdp++) {
1798                                 fde = &fdesc->fd_ofiles[*fdp];
1799                                 fde->fde_file = fdep[i]->fde_file;
1800                                 filecaps_move(&fdep[i]->fde_caps,
1801                                     &fde->fde_caps);
1802                                 if ((flags & MSG_CMSG_CLOEXEC) != 0)
1803                                         fde->fde_flags |= UF_EXCLOSE;
1804                                 unp_externalize_fp(fde->fde_file);
1805                         }
1806                         FILEDESC_XUNLOCK(fdesc);
1807                         free(fdep[0], M_FILECAPS);
1808                 } else {
1809                         /* We can just copy anything else across. */
1810                         if (error || controlp == NULL)
1811                                 goto next;
1812                         *controlp = sbcreatecontrol(NULL, datalen,
1813                             cm->cmsg_type, cm->cmsg_level);
1814                         if (*controlp == NULL) {
1815                                 error = ENOBUFS;
1816                                 goto next;
1817                         }
1818                         bcopy(data,
1819                             CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1820                             datalen);
1821                 }
1822                 controlp = &(*controlp)->m_next;
1823
1824 next:
1825                 if (CMSG_SPACE(datalen) < clen) {
1826                         clen -= CMSG_SPACE(datalen);
1827                         cm = (struct cmsghdr *)
1828                             ((caddr_t)cm + CMSG_SPACE(datalen));
1829                 } else {
1830                         clen = 0;
1831                         cm = NULL;
1832                 }
1833         }
1834
1835         m_freem(control);
1836         return (error);
1837 }
1838
1839 static void
1840 unp_zone_change(void *tag)
1841 {
1842
1843         uma_zone_set_max(unp_zone, maxsockets);
1844 }
1845
1846 static void
1847 unp_init(void)
1848 {
1849
1850 #ifdef VIMAGE
1851         if (!IS_DEFAULT_VNET(curvnet))
1852                 return;
1853 #endif
1854         unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1855             NULL, NULL, UMA_ALIGN_PTR, 0);
1856         if (unp_zone == NULL)
1857                 panic("unp_init");
1858         uma_zone_set_max(unp_zone, maxsockets);
1859         uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1860         EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1861             NULL, EVENTHANDLER_PRI_ANY);
1862         LIST_INIT(&unp_dhead);
1863         LIST_INIT(&unp_shead);
1864         LIST_INIT(&unp_sphead);
1865         SLIST_INIT(&unp_defers);
1866         TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1867         TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1868         UNP_LINK_LOCK_INIT();
1869         UNP_LIST_LOCK_INIT();
1870         UNP_DEFERRED_LOCK_INIT();
1871 }
1872
1873 static int
1874 unp_internalize(struct mbuf **controlp, struct thread *td)
1875 {
1876         struct mbuf *control = *controlp;
1877         struct proc *p = td->td_proc;
1878         struct filedesc *fdesc = p->p_fd;
1879         struct bintime *bt;
1880         struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1881         struct cmsgcred *cmcred;
1882         struct filedescent *fde, **fdep, *fdev;
1883         struct file *fp;
1884         struct timeval *tv;
1885         int i, *fdp;
1886         void *data;
1887         socklen_t clen = control->m_len, datalen;
1888         int error, oldfds;
1889         u_int newlen;
1890
1891         UNP_LINK_UNLOCK_ASSERT();
1892
1893         error = 0;
1894         *controlp = NULL;
1895         while (cm != NULL) {
1896                 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1897                     || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
1898                         error = EINVAL;
1899                         goto out;
1900                 }
1901                 data = CMSG_DATA(cm);
1902                 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1903
1904                 switch (cm->cmsg_type) {
1905                 /*
1906                  * Fill in credential information.
1907                  */
1908                 case SCM_CREDS:
1909                         *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1910                             SCM_CREDS, SOL_SOCKET);
1911                         if (*controlp == NULL) {
1912                                 error = ENOBUFS;
1913                                 goto out;
1914                         }
1915                         cmcred = (struct cmsgcred *)
1916                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1917                         cmcred->cmcred_pid = p->p_pid;
1918                         cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1919                         cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1920                         cmcred->cmcred_euid = td->td_ucred->cr_uid;
1921                         cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1922                             CMGROUP_MAX);
1923                         for (i = 0; i < cmcred->cmcred_ngroups; i++)
1924                                 cmcred->cmcred_groups[i] =
1925                                     td->td_ucred->cr_groups[i];
1926                         break;
1927
1928                 case SCM_RIGHTS:
1929                         oldfds = datalen / sizeof (int);
1930                         if (oldfds == 0)
1931                                 break;
1932                         /*
1933                          * Check that all the FDs passed in refer to legal
1934                          * files.  If not, reject the entire operation.
1935                          */
1936                         fdp = data;
1937                         FILEDESC_SLOCK(fdesc);
1938                         for (i = 0; i < oldfds; i++, fdp++) {
1939                                 fp = fget_locked(fdesc, *fdp);
1940                                 if (fp == NULL) {
1941                                         FILEDESC_SUNLOCK(fdesc);
1942                                         error = EBADF;
1943                                         goto out;
1944                                 }
1945                                 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1946                                         FILEDESC_SUNLOCK(fdesc);
1947                                         error = EOPNOTSUPP;
1948                                         goto out;
1949                                 }
1950
1951                         }
1952
1953                         /*
1954                          * Now replace the integer FDs with pointers to the
1955                          * file structure and capability rights.
1956                          */
1957                         newlen = oldfds * sizeof(fdep[0]);
1958                         *controlp = sbcreatecontrol(NULL, newlen,
1959                             SCM_RIGHTS, SOL_SOCKET);
1960                         if (*controlp == NULL) {
1961                                 FILEDESC_SUNLOCK(fdesc);
1962                                 error = E2BIG;
1963                                 goto out;
1964                         }
1965                         fdp = data;
1966                         fdep = (struct filedescent **)
1967                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1968                         fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1969                             M_WAITOK);
1970                         for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1971                                 fde = &fdesc->fd_ofiles[*fdp];
1972                                 fdep[i] = fdev;
1973                                 fdep[i]->fde_file = fde->fde_file;
1974                                 filecaps_copy(&fde->fde_caps,
1975                                     &fdep[i]->fde_caps);
1976                                 unp_internalize_fp(fdep[i]->fde_file);
1977                         }
1978                         FILEDESC_SUNLOCK(fdesc);
1979                         break;
1980
1981                 case SCM_TIMESTAMP:
1982                         *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1983                             SCM_TIMESTAMP, SOL_SOCKET);
1984                         if (*controlp == NULL) {
1985                                 error = ENOBUFS;
1986                                 goto out;
1987                         }
1988                         tv = (struct timeval *)
1989                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1990                         microtime(tv);
1991                         break;
1992
1993                 case SCM_BINTIME:
1994                         *controlp = sbcreatecontrol(NULL, sizeof(*bt),
1995                             SCM_BINTIME, SOL_SOCKET);
1996                         if (*controlp == NULL) {
1997                                 error = ENOBUFS;
1998                                 goto out;
1999                         }
2000                         bt = (struct bintime *)
2001                             CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2002                         bintime(bt);
2003                         break;
2004
2005                 default:
2006                         error = EINVAL;
2007                         goto out;
2008                 }
2009
2010                 controlp = &(*controlp)->m_next;
2011                 if (CMSG_SPACE(datalen) < clen) {
2012                         clen -= CMSG_SPACE(datalen);
2013                         cm = (struct cmsghdr *)
2014                             ((caddr_t)cm + CMSG_SPACE(datalen));
2015                 } else {
2016                         clen = 0;
2017                         cm = NULL;
2018                 }
2019         }
2020
2021 out:
2022         m_freem(control);
2023         return (error);
2024 }
2025
2026 static struct mbuf *
2027 unp_addsockcred(struct thread *td, struct mbuf *control)
2028 {
2029         struct mbuf *m, *n, *n_prev;
2030         struct sockcred *sc;
2031         const struct cmsghdr *cm;
2032         int ngroups;
2033         int i;
2034
2035         ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2036         m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2037         if (m == NULL)
2038                 return (control);
2039
2040         sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2041         sc->sc_uid = td->td_ucred->cr_ruid;
2042         sc->sc_euid = td->td_ucred->cr_uid;
2043         sc->sc_gid = td->td_ucred->cr_rgid;
2044         sc->sc_egid = td->td_ucred->cr_gid;
2045         sc->sc_ngroups = ngroups;
2046         for (i = 0; i < sc->sc_ngroups; i++)
2047                 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2048
2049         /*
2050          * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2051          * created SCM_CREDS control message (struct sockcred) has another
2052          * format.
2053          */
2054         if (control != NULL)
2055                 for (n = control, n_prev = NULL; n != NULL;) {
2056                         cm = mtod(n, struct cmsghdr *);
2057                         if (cm->cmsg_level == SOL_SOCKET &&
2058                             cm->cmsg_type == SCM_CREDS) {
2059                                 if (n_prev == NULL)
2060                                         control = n->m_next;
2061                                 else
2062                                         n_prev->m_next = n->m_next;
2063                                 n = m_free(n);
2064                         } else {
2065                                 n_prev = n;
2066                                 n = n->m_next;
2067                         }
2068                 }
2069
2070         /* Prepend it to the head. */
2071         m->m_next = control;
2072         return (m);
2073 }
2074
2075 static struct unpcb *
2076 fptounp(struct file *fp)
2077 {
2078         struct socket *so;
2079
2080         if (fp->f_type != DTYPE_SOCKET)
2081                 return (NULL);
2082         if ((so = fp->f_data) == NULL)
2083                 return (NULL);
2084         if (so->so_proto->pr_domain != &localdomain)
2085                 return (NULL);
2086         return sotounpcb(so);
2087 }
2088
2089 static void
2090 unp_discard(struct file *fp)
2091 {
2092         struct unp_defer *dr;
2093
2094         if (unp_externalize_fp(fp)) {
2095                 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2096                 dr->ud_fp = fp;
2097                 UNP_DEFERRED_LOCK();
2098                 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2099                 UNP_DEFERRED_UNLOCK();
2100                 atomic_add_int(&unp_defers_count, 1);
2101                 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2102         } else
2103                 (void) closef(fp, (struct thread *)NULL);
2104 }
2105
2106 static void
2107 unp_process_defers(void *arg __unused, int pending)
2108 {
2109         struct unp_defer *dr;
2110         SLIST_HEAD(, unp_defer) drl;
2111         int count;
2112
2113         SLIST_INIT(&drl);
2114         for (;;) {
2115                 UNP_DEFERRED_LOCK();
2116                 if (SLIST_FIRST(&unp_defers) == NULL) {
2117                         UNP_DEFERRED_UNLOCK();
2118                         break;
2119                 }
2120                 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2121                 UNP_DEFERRED_UNLOCK();
2122                 count = 0;
2123                 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2124                         SLIST_REMOVE_HEAD(&drl, ud_link);
2125                         closef(dr->ud_fp, NULL);
2126                         free(dr, M_TEMP);
2127                         count++;
2128                 }
2129                 atomic_add_int(&unp_defers_count, -count);
2130         }
2131 }
2132
2133 static void
2134 unp_internalize_fp(struct file *fp)
2135 {
2136         struct unpcb *unp;
2137
2138         UNP_LINK_WLOCK();
2139         if ((unp = fptounp(fp)) != NULL) {
2140                 unp->unp_file = fp;
2141                 unp->unp_msgcount++;
2142         }
2143         fhold(fp);
2144         unp_rights++;
2145         UNP_LINK_WUNLOCK();
2146 }
2147
2148 static int
2149 unp_externalize_fp(struct file *fp)
2150 {
2151         struct unpcb *unp;
2152         int ret;
2153
2154         UNP_LINK_WLOCK();
2155         if ((unp = fptounp(fp)) != NULL) {
2156                 unp->unp_msgcount--;
2157                 ret = 1;
2158         } else
2159                 ret = 0;
2160         unp_rights--;
2161         UNP_LINK_WUNLOCK();
2162         return (ret);
2163 }
2164
2165 /*
2166  * unp_defer indicates whether additional work has been defered for a future
2167  * pass through unp_gc().  It is thread local and does not require explicit
2168  * synchronization.
2169  */
2170 static int      unp_marked;
2171 static int      unp_unreachable;
2172
2173 static void
2174 unp_accessable(struct filedescent **fdep, int fdcount)
2175 {
2176         struct unpcb *unp;
2177         struct file *fp;
2178         int i;
2179
2180         for (i = 0; i < fdcount; i++) {
2181                 fp = fdep[i]->fde_file;
2182                 if ((unp = fptounp(fp)) == NULL)
2183                         continue;
2184                 if (unp->unp_gcflag & UNPGC_REF)
2185                         continue;
2186                 unp->unp_gcflag &= ~UNPGC_DEAD;
2187                 unp->unp_gcflag |= UNPGC_REF;
2188                 unp_marked++;
2189         }
2190 }
2191
2192 static void
2193 unp_gc_process(struct unpcb *unp)
2194 {
2195         struct socket *soa;
2196         struct socket *so;
2197         struct file *fp;
2198
2199         /* Already processed. */
2200         if (unp->unp_gcflag & UNPGC_SCANNED)
2201                 return;
2202         fp = unp->unp_file;
2203
2204         /*
2205          * Check for a socket potentially in a cycle.  It must be in a
2206          * queue as indicated by msgcount, and this must equal the file
2207          * reference count.  Note that when msgcount is 0 the file is NULL.
2208          */
2209         if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2210             unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2211                 unp->unp_gcflag |= UNPGC_DEAD;
2212                 unp_unreachable++;
2213                 return;
2214         }
2215
2216         /*
2217          * Mark all sockets we reference with RIGHTS.
2218          */
2219         so = unp->unp_socket;
2220         SOCKBUF_LOCK(&so->so_rcv);
2221         unp_scan(so->so_rcv.sb_mb, unp_accessable);
2222         SOCKBUF_UNLOCK(&so->so_rcv);
2223
2224         /*
2225          * Mark all sockets in our accept queue.
2226          */
2227         ACCEPT_LOCK();
2228         TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2229                 SOCKBUF_LOCK(&soa->so_rcv);
2230                 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2231                 SOCKBUF_UNLOCK(&soa->so_rcv);
2232         }
2233         ACCEPT_UNLOCK();
2234         unp->unp_gcflag |= UNPGC_SCANNED;
2235 }
2236
2237 static int unp_recycled;
2238 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2239     "Number of unreachable sockets claimed by the garbage collector.");
2240
2241 static int unp_taskcount;
2242 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2243     "Number of times the garbage collector has run.");
2244
2245 static void
2246 unp_gc(__unused void *arg, int pending)
2247 {
2248         struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2249                                     NULL };
2250         struct unp_head **head;
2251         struct file *f, **unref;
2252         struct unpcb *unp;
2253         int i, total;
2254
2255         unp_taskcount++;
2256         UNP_LIST_LOCK();
2257         /*
2258          * First clear all gc flags from previous runs.
2259          */
2260         for (head = heads; *head != NULL; head++)
2261                 LIST_FOREACH(unp, *head, unp_link)
2262                         unp->unp_gcflag = 0;
2263
2264         /*
2265          * Scan marking all reachable sockets with UNPGC_REF.  Once a socket
2266          * is reachable all of the sockets it references are reachable.
2267          * Stop the scan once we do a complete loop without discovering
2268          * a new reachable socket.
2269          */
2270         do {
2271                 unp_unreachable = 0;
2272                 unp_marked = 0;
2273                 for (head = heads; *head != NULL; head++)
2274                         LIST_FOREACH(unp, *head, unp_link)
2275                                 unp_gc_process(unp);
2276         } while (unp_marked);
2277         UNP_LIST_UNLOCK();
2278         if (unp_unreachable == 0)
2279                 return;
2280
2281         /*
2282          * Allocate space for a local list of dead unpcbs.
2283          */
2284         unref = malloc(unp_unreachable * sizeof(struct file *),
2285             M_TEMP, M_WAITOK);
2286
2287         /*
2288          * Iterate looking for sockets which have been specifically marked
2289          * as as unreachable and store them locally.
2290          */
2291         UNP_LINK_RLOCK();
2292         UNP_LIST_LOCK();
2293         for (total = 0, head = heads; *head != NULL; head++)
2294                 LIST_FOREACH(unp, *head, unp_link)
2295                         if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2296                                 f = unp->unp_file;
2297                                 if (unp->unp_msgcount == 0 || f == NULL ||
2298                                     f->f_count != unp->unp_msgcount)
2299                                         continue;
2300                                 unref[total++] = f;
2301                                 fhold(f);
2302                                 KASSERT(total <= unp_unreachable,
2303                                     ("unp_gc: incorrect unreachable count."));
2304                         }
2305         UNP_LIST_UNLOCK();
2306         UNP_LINK_RUNLOCK();
2307
2308         /*
2309          * Now flush all sockets, free'ing rights.  This will free the
2310          * struct files associated with these sockets but leave each socket
2311          * with one remaining ref.
2312          */
2313         for (i = 0; i < total; i++) {
2314                 struct socket *so;
2315
2316                 so = unref[i]->f_data;
2317                 CURVNET_SET(so->so_vnet);
2318                 sorflush(so);
2319                 CURVNET_RESTORE();
2320         }
2321
2322         /*
2323          * And finally release the sockets so they can be reclaimed.
2324          */
2325         for (i = 0; i < total; i++)
2326                 fdrop(unref[i], NULL);
2327         unp_recycled += total;
2328         free(unref, M_TEMP);
2329 }
2330
2331 static void
2332 unp_dispose(struct mbuf *m)
2333 {
2334
2335         if (m)
2336                 unp_scan(m, unp_freerights);
2337 }
2338
2339 static void
2340 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2341 {
2342         struct mbuf *m;
2343         struct cmsghdr *cm;
2344         void *data;
2345         socklen_t clen, datalen;
2346
2347         while (m0 != NULL) {
2348                 for (m = m0; m; m = m->m_next) {
2349                         if (m->m_type != MT_CONTROL)
2350                                 continue;
2351
2352                         cm = mtod(m, struct cmsghdr *);
2353                         clen = m->m_len;
2354
2355                         while (cm != NULL) {
2356                                 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2357                                         break;
2358
2359                                 data = CMSG_DATA(cm);
2360                                 datalen = (caddr_t)cm + cm->cmsg_len
2361                                     - (caddr_t)data;
2362
2363                                 if (cm->cmsg_level == SOL_SOCKET &&
2364                                     cm->cmsg_type == SCM_RIGHTS) {
2365                                         (*op)(data, datalen /
2366                                             sizeof(struct filedescent *));
2367                                 }
2368
2369                                 if (CMSG_SPACE(datalen) < clen) {
2370                                         clen -= CMSG_SPACE(datalen);
2371                                         cm = (struct cmsghdr *)
2372                                             ((caddr_t)cm + CMSG_SPACE(datalen));
2373                                 } else {
2374                                         clen = 0;
2375                                         cm = NULL;
2376                                 }
2377                         }
2378                 }
2379                 m0 = m0->m_nextpkt;
2380         }
2381 }
2382
2383 /*
2384  * A helper function called by VFS before socket-type vnode reclamation.
2385  * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2386  * use count.
2387  */
2388 void
2389 vfs_unp_reclaim(struct vnode *vp)
2390 {
2391         struct socket *so;
2392         struct unpcb *unp;
2393         int active;
2394
2395         ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2396         KASSERT(vp->v_type == VSOCK,
2397             ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2398
2399         active = 0;
2400         UNP_LINK_WLOCK();
2401         VOP_UNP_CONNECT(vp, &so);
2402         if (so == NULL)
2403                 goto done;
2404         unp = sotounpcb(so);
2405         if (unp == NULL)
2406                 goto done;
2407         UNP_PCB_LOCK(unp);
2408         if (unp->unp_vnode == vp) {
2409                 VOP_UNP_DETACH(vp);
2410                 unp->unp_vnode = NULL;
2411                 active = 1;
2412         }
2413         UNP_PCB_UNLOCK(unp);
2414 done:
2415         UNP_LINK_WUNLOCK();
2416         if (active)
2417                 vunref(vp);
2418 }
2419
2420 #ifdef DDB
2421 static void
2422 db_print_indent(int indent)
2423 {
2424         int i;
2425
2426         for (i = 0; i < indent; i++)
2427                 db_printf(" ");
2428 }
2429
2430 static void
2431 db_print_unpflags(int unp_flags)
2432 {
2433         int comma;
2434
2435         comma = 0;
2436         if (unp_flags & UNP_HAVEPC) {
2437                 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2438                 comma = 1;
2439         }
2440         if (unp_flags & UNP_HAVEPCCACHED) {
2441                 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2442                 comma = 1;
2443         }
2444         if (unp_flags & UNP_WANTCRED) {
2445                 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2446                 comma = 1;
2447         }
2448         if (unp_flags & UNP_CONNWAIT) {
2449                 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2450                 comma = 1;
2451         }
2452         if (unp_flags & UNP_CONNECTING) {
2453                 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2454                 comma = 1;
2455         }
2456         if (unp_flags & UNP_BINDING) {
2457                 db_printf("%sUNP_BINDING", comma ? ", " : "");
2458                 comma = 1;
2459         }
2460 }
2461
2462 static void
2463 db_print_xucred(int indent, struct xucred *xu)
2464 {
2465         int comma, i;
2466
2467         db_print_indent(indent);
2468         db_printf("cr_version: %u   cr_uid: %u   cr_ngroups: %d\n",
2469             xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2470         db_print_indent(indent);
2471         db_printf("cr_groups: ");
2472         comma = 0;
2473         for (i = 0; i < xu->cr_ngroups; i++) {
2474                 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2475                 comma = 1;
2476         }
2477         db_printf("\n");
2478 }
2479
2480 static void
2481 db_print_unprefs(int indent, struct unp_head *uh)
2482 {
2483         struct unpcb *unp;
2484         int counter;
2485
2486         counter = 0;
2487         LIST_FOREACH(unp, uh, unp_reflink) {
2488                 if (counter % 4 == 0)
2489                         db_print_indent(indent);
2490                 db_printf("%p  ", unp);
2491                 if (counter % 4 == 3)
2492                         db_printf("\n");
2493                 counter++;
2494         }
2495         if (counter != 0 && counter % 4 != 0)
2496                 db_printf("\n");
2497 }
2498
2499 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2500 {
2501         struct unpcb *unp;
2502
2503         if (!have_addr) {
2504                 db_printf("usage: show unpcb <addr>\n");
2505                 return;
2506         }
2507         unp = (struct unpcb *)addr;
2508
2509         db_printf("unp_socket: %p   unp_vnode: %p\n", unp->unp_socket,
2510             unp->unp_vnode);
2511
2512         db_printf("unp_ino: %ju   unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2513             unp->unp_conn);
2514
2515         db_printf("unp_refs:\n");
2516         db_print_unprefs(2, &unp->unp_refs);
2517
2518         /* XXXRW: Would be nice to print the full address, if any. */
2519         db_printf("unp_addr: %p\n", unp->unp_addr);
2520
2521         db_printf("unp_gencnt: %llu\n",
2522             (unsigned long long)unp->unp_gencnt);
2523
2524         db_printf("unp_flags: %x (", unp->unp_flags);
2525         db_print_unpflags(unp->unp_flags);
2526         db_printf(")\n");
2527
2528         db_printf("unp_peercred:\n");
2529         db_print_xucred(2, &unp->unp_peercred);
2530
2531         db_printf("unp_refcount: %u\n", unp->unp_refcount);
2532 }
2533 #endif