mirror of
https://git.FreeBSD.org/src.git
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620216725a
being less than 0 instead of using cast-to-unsigned hack. Today's commit was brought to you by the letters 'B', 'D' and 'E' :)
2455 lines
61 KiB
C
2455 lines
61 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California.
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* Copyright (c) 2004-2009 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
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*/
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/*
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* UNIX Domain (Local) Sockets
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*
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* This is an implementation of UNIX (local) domain sockets. Each socket has
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* an associated struct unpcb (UNIX protocol control block). Stream sockets
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* may be connected to 0 or 1 other socket. Datagram sockets may be
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* connected to 0, 1, or many other sockets. Sockets may be created and
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* connected in pairs (socketpair(2)), or bound/connected to using the file
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* system name space. For most purposes, only the receive socket buffer is
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* used, as sending on one socket delivers directly to the receive socket
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* buffer of a second socket.
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*
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* The implementation is substantially complicated by the fact that
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* "ancillary data", such as file descriptors or credentials, may be passed
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* across UNIX domain sockets. The potential for passing UNIX domain sockets
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* over other UNIX domain sockets requires the implementation of a simple
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* garbage collector to find and tear down cycles of disconnected sockets.
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*
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* TODO:
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* RDM
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* distinguish datagram size limits from flow control limits in SEQPACKET
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* rethink name space problems
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* need a proper out-of-band
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h> /* XXX must be before <sys/file.h> */
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#include <sys/eventhandler.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/queue.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/taskqueue.h>
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#include <sys/un.h>
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#include <sys/unpcb.h>
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#include <sys/vnode.h>
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#include <net/vnet.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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#include <security/mac/mac_framework.h>
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#include <vm/uma.h>
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/*
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* Locking key:
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* (l) Locked using list lock
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* (g) Locked using linkage lock
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*/
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static uma_zone_t unp_zone;
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static unp_gen_t unp_gencnt; /* (l) */
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static u_int unp_count; /* (l) Count of local sockets. */
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static ino_t unp_ino; /* Prototype for fake inode numbers. */
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static int unp_rights; /* (g) File descriptors in flight. */
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static struct unp_head unp_shead; /* (l) List of stream sockets. */
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static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
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static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
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struct unp_defer {
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SLIST_ENTRY(unp_defer) ud_link;
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struct file *ud_fp;
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};
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static SLIST_HEAD(, unp_defer) unp_defers;
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static int unp_defers_count;
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static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
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/*
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* Garbage collection of cyclic file descriptor/socket references occurs
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* asynchronously in a taskqueue context in order to avoid recursion and
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* reentrance in the UNIX domain socket, file descriptor, and socket layer
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* code. See unp_gc() for a full description.
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*/
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static struct task unp_gc_task;
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/*
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* The close of unix domain sockets attached as SCM_RIGHTS is
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* postponed to the taskqueue, to avoid arbitrary recursion depth.
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* The attached sockets might have another sockets attached.
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*/
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static struct task unp_defer_task;
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/*
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* Both send and receive buffers are allocated PIPSIZ bytes of buffering for
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* stream sockets, although the total for sender and receiver is actually
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* only PIPSIZ.
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*
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* Datagram sockets really use the sendspace as the maximum datagram size,
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* and don't really want to reserve the sendspace. Their recvspace should be
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* large enough for at least one max-size datagram plus address.
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*/
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#ifndef PIPSIZ
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#define PIPSIZ 8192
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#endif
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static u_long unpst_sendspace = PIPSIZ;
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static u_long unpst_recvspace = PIPSIZ;
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static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
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static u_long unpdg_recvspace = 4*1024;
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static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
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static u_long unpsp_recvspace = PIPSIZ;
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static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
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static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
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"SOCK_STREAM");
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static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
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static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
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"SOCK_SEQPACKET");
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SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
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&unpst_sendspace, 0, "Default stream send space.");
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SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
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&unpst_recvspace, 0, "Default stream receive space.");
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SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
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&unpdg_sendspace, 0, "Default datagram send space.");
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SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
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&unpdg_recvspace, 0, "Default datagram receive space.");
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SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
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&unpsp_sendspace, 0, "Default seqpacket send space.");
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SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
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&unpsp_recvspace, 0, "Default seqpacket receive space.");
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SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
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"File descriptors in flight.");
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SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
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&unp_defers_count, 0,
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"File descriptors deferred to taskqueue for close.");
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/*
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* Locking and synchronization:
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*
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* Three types of locks exit in the local domain socket implementation: a
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* global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the
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* global locks, the list lock protects the socket count, global generation
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* number, and stream/datagram global lists. The linkage lock protects the
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* interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
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* held exclusively over the acquisition of multiple unpcb locks to prevent
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* deadlock.
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*
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* UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
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* allocated in pru_attach() and freed in pru_detach(). The validity of that
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* pointer is an invariant, so no lock is required to dereference the so_pcb
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* pointer if a valid socket reference is held by the caller. In practice,
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* this is always true during operations performed on a socket. Each unpcb
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* has a back-pointer to its socket, unp_socket, which will be stable under
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* the same circumstances.
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*
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* This pointer may only be safely dereferenced as long as a valid reference
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* to the unpcb is held. Typically, this reference will be from the socket,
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* or from another unpcb when the referring unpcb's lock is held (in order
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* that the reference not be invalidated during use). For example, to follow
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* unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
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* as unp_socket remains valid as long as the reference to unp_conn is valid.
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*
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* Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
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* atomic reads without the lock may be performed "lockless", but more
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* complex reads and read-modify-writes require the mutex to be held. No
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* lock order is defined between unpcb locks -- multiple unpcb locks may be
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* acquired at the same time only when holding the linkage rwlock
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* exclusively, which prevents deadlocks.
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*
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* Blocking with UNIX domain sockets is a tricky issue: unlike most network
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* protocols, bind() is a non-atomic operation, and connect() requires
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* potential sleeping in the protocol, due to potentially waiting on local or
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* distributed file systems. We try to separate "lookup" operations, which
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* may sleep, and the IPC operations themselves, which typically can occur
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* with relative atomicity as locks can be held over the entire operation.
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*
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* Another tricky issue is simultaneous multi-threaded or multi-process
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* access to a single UNIX domain socket. These are handled by the flags
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* UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
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* binding, both of which involve dropping UNIX domain socket locks in order
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* to perform namei() and other file system operations.
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*/
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static struct rwlock unp_link_rwlock;
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static struct mtx unp_list_lock;
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static struct mtx unp_defers_lock;
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#define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
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"unp_link_rwlock")
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#define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
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RA_LOCKED)
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#define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
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RA_UNLOCKED)
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#define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
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#define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
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#define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
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#define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
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#define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
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RA_WLOCKED)
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#define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \
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"unp_list_lock", NULL, MTX_DEF)
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#define UNP_LIST_LOCK() mtx_lock(&unp_list_lock)
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#define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock)
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#define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
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"unp_defer", NULL, MTX_DEF)
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#define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
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#define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
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#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
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"unp_mtx", "unp_mtx", \
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MTX_DUPOK|MTX_DEF|MTX_RECURSE)
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#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
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#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
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#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
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#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
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static int uipc_connect2(struct socket *, struct socket *);
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static int uipc_ctloutput(struct socket *, struct sockopt *);
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static int unp_connect(struct socket *, struct sockaddr *,
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struct thread *);
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static int unp_connect2(struct socket *so, struct socket *so2, int);
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static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
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static void unp_dispose(struct mbuf *);
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static void unp_shutdown(struct unpcb *);
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static void unp_drop(struct unpcb *, int);
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static void unp_gc(__unused void *, int);
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static void unp_scan(struct mbuf *, void (*)(struct file *));
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static void unp_discard(struct file *);
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static void unp_freerights(struct file **, int);
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static void unp_init(void);
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static int unp_internalize(struct mbuf **, struct thread *);
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static void unp_internalize_fp(struct file *);
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static int unp_externalize(struct mbuf *, struct mbuf **);
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static int unp_externalize_fp(struct file *);
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static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
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static void unp_process_defers(void * __unused, int);
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/*
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* Definitions of protocols supported in the LOCAL domain.
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*/
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static struct domain localdomain;
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static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
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static struct pr_usrreqs uipc_usrreqs_seqpacket;
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static struct protosw localsw[] = {
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{
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.pr_type = SOCK_STREAM,
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.pr_domain = &localdomain,
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.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
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.pr_ctloutput = &uipc_ctloutput,
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.pr_usrreqs = &uipc_usrreqs_stream
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},
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{
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.pr_type = SOCK_DGRAM,
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.pr_domain = &localdomain,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
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.pr_usrreqs = &uipc_usrreqs_dgram
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},
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{
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.pr_type = SOCK_SEQPACKET,
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.pr_domain = &localdomain,
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/*
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* XXXRW: For now, PR_ADDR because soreceive will bump into them
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* due to our use of sbappendaddr. A new sbappend variants is needed
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* that supports both atomic record writes and control data.
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*/
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.pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
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PR_RIGHTS,
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.pr_usrreqs = &uipc_usrreqs_seqpacket,
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},
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};
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static struct domain localdomain = {
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.dom_family = AF_LOCAL,
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.dom_name = "local",
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.dom_init = unp_init,
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.dom_externalize = unp_externalize,
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.dom_dispose = unp_dispose,
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.dom_protosw = localsw,
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.dom_protoswNPROTOSW = &localsw[sizeof(localsw)/sizeof(localsw[0])]
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};
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DOMAIN_SET(local);
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static void
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uipc_abort(struct socket *so)
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{
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struct unpcb *unp, *unp2;
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unp = sotounpcb(so);
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KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
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UNP_LINK_WLOCK();
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UNP_PCB_LOCK(unp);
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unp2 = unp->unp_conn;
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if (unp2 != NULL) {
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UNP_PCB_LOCK(unp2);
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unp_drop(unp2, ECONNABORTED);
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UNP_PCB_UNLOCK(unp2);
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}
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UNP_PCB_UNLOCK(unp);
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UNP_LINK_WUNLOCK();
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}
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static int
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uipc_accept(struct socket *so, struct sockaddr **nam)
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{
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struct unpcb *unp, *unp2;
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const struct sockaddr *sa;
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/*
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* Pass back name of connected socket, if it was bound and we are
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* still connected (our peer may have closed already!).
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*/
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unp = sotounpcb(so);
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KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
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*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
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UNP_LINK_RLOCK();
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unp2 = unp->unp_conn;
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if (unp2 != NULL && unp2->unp_addr != NULL) {
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UNP_PCB_LOCK(unp2);
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sa = (struct sockaddr *) unp2->unp_addr;
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bcopy(sa, *nam, sa->sa_len);
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UNP_PCB_UNLOCK(unp2);
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} else {
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sa = &sun_noname;
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bcopy(sa, *nam, sa->sa_len);
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}
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UNP_LINK_RUNLOCK();
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return (0);
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}
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static int
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uipc_attach(struct socket *so, int proto, struct thread *td)
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{
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u_long sendspace, recvspace;
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struct unpcb *unp;
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int error;
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KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
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if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
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switch (so->so_type) {
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case SOCK_STREAM:
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sendspace = unpst_sendspace;
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recvspace = unpst_recvspace;
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break;
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case SOCK_DGRAM:
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sendspace = unpdg_sendspace;
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recvspace = unpdg_recvspace;
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break;
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case SOCK_SEQPACKET:
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sendspace = unpsp_sendspace;
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recvspace = unpsp_recvspace;
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break;
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default:
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panic("uipc_attach");
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}
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error = soreserve(so, sendspace, recvspace);
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if (error)
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return (error);
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}
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unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
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if (unp == NULL)
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return (ENOBUFS);
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LIST_INIT(&unp->unp_refs);
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UNP_PCB_LOCK_INIT(unp);
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unp->unp_socket = so;
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so->so_pcb = unp;
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|
unp->unp_refcount = 1;
|
|
|
|
UNP_LIST_LOCK();
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
unp_count++;
|
|
switch (so->so_type) {
|
|
case SOCK_STREAM:
|
|
LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
|
|
break;
|
|
|
|
case SOCK_SEQPACKET:
|
|
LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
|
|
break;
|
|
|
|
default:
|
|
panic("uipc_attach");
|
|
}
|
|
UNP_LIST_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
|
|
struct vattr vattr;
|
|
int error, namelen, vfslocked;
|
|
struct nameidata nd;
|
|
struct unpcb *unp;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
char *buf;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
|
|
|
|
if (soun->sun_len > sizeof(struct sockaddr_un))
|
|
return (EINVAL);
|
|
namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
|
|
if (namelen <= 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* We don't allow simultaneous bind() calls on a single UNIX domain
|
|
* socket, so flag in-progress operations, and return an error if an
|
|
* operation is already in progress.
|
|
*
|
|
* Historically, we have not allowed a socket to be rebound, so this
|
|
* also returns an error. Not allowing re-binding simplifies the
|
|
* implementation and avoids a great many possible failure modes.
|
|
*/
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_vnode != NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (EINVAL);
|
|
}
|
|
if (unp->unp_flags & UNP_BINDING) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (EALREADY);
|
|
}
|
|
unp->unp_flags |= UNP_BINDING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
|
|
buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
|
|
bcopy(soun->sun_path, buf, namelen);
|
|
buf[namelen] = 0;
|
|
|
|
restart:
|
|
vfslocked = 0;
|
|
NDINIT(&nd, CREATE, MPSAFE | NOFOLLOW | LOCKPARENT | SAVENAME,
|
|
UIO_SYSSPACE, buf, td);
|
|
/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
|
|
error = namei(&nd);
|
|
if (error)
|
|
goto error;
|
|
vp = nd.ni_vp;
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (nd.ni_dvp == vp)
|
|
vrele(nd.ni_dvp);
|
|
else
|
|
vput(nd.ni_dvp);
|
|
if (vp != NULL) {
|
|
vrele(vp);
|
|
error = EADDRINUSE;
|
|
goto error;
|
|
}
|
|
error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
|
|
if (error)
|
|
goto error;
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
goto restart;
|
|
}
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_type = VSOCK;
|
|
vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
|
|
#ifdef MAC
|
|
error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
|
|
&vattr);
|
|
#endif
|
|
if (error == 0)
|
|
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vput(nd.ni_dvp);
|
|
if (error) {
|
|
vn_finished_write(mp);
|
|
goto error;
|
|
}
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_ELOCKED(vp, "uipc_bind");
|
|
soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
|
|
|
|
UNP_LINK_WLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
VOP_UNP_BIND(vp, unp->unp_socket);
|
|
unp->unp_vnode = vp;
|
|
unp->unp_addr = soun;
|
|
unp->unp_flags &= ~UNP_BINDING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_WUNLOCK();
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_finished_write(mp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
free(buf, M_TEMP);
|
|
return (0);
|
|
|
|
error:
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
UNP_PCB_LOCK(unp);
|
|
unp->unp_flags &= ~UNP_BINDING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
free(buf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
KASSERT(td == curthread, ("uipc_connect: td != curthread"));
|
|
UNP_LINK_WLOCK();
|
|
error = unp_connect(so, nam, td);
|
|
UNP_LINK_WUNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
uipc_close(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
|
|
|
|
UNP_LINK_WLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 != NULL) {
|
|
UNP_PCB_LOCK(unp2);
|
|
unp_disconnect(unp, unp2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_WUNLOCK();
|
|
}
|
|
|
|
static int
|
|
uipc_connect2(struct socket *so1, struct socket *so2)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
int error;
|
|
|
|
UNP_LINK_WLOCK();
|
|
unp = so1->so_pcb;
|
|
KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = so2->so_pcb;
|
|
KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
|
|
UNP_PCB_LOCK(unp2);
|
|
error = unp_connect2(so1, so2, PRU_CONNECT2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_WUNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
uipc_detach(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct sockaddr_un *saved_unp_addr;
|
|
struct vnode *vp;
|
|
int freeunp, local_unp_rights;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
|
|
|
|
UNP_LINK_WLOCK();
|
|
UNP_LIST_LOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
LIST_REMOVE(unp, unp_link);
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
--unp_count;
|
|
UNP_LIST_UNLOCK();
|
|
|
|
/*
|
|
* XXXRW: Should assert vp->v_socket == so.
|
|
*/
|
|
if ((vp = unp->unp_vnode) != NULL) {
|
|
VOP_UNP_DETACH(vp);
|
|
unp->unp_vnode = NULL;
|
|
}
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 != NULL) {
|
|
UNP_PCB_LOCK(unp2);
|
|
unp_disconnect(unp, unp2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
|
|
/*
|
|
* We hold the linkage lock exclusively, so it's OK to acquire
|
|
* multiple pcb locks at a time.
|
|
*/
|
|
while (!LIST_EMPTY(&unp->unp_refs)) {
|
|
struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
|
|
|
|
UNP_PCB_LOCK(ref);
|
|
unp_drop(ref, ECONNRESET);
|
|
UNP_PCB_UNLOCK(ref);
|
|
}
|
|
local_unp_rights = unp_rights;
|
|
UNP_LINK_WUNLOCK();
|
|
unp->unp_socket->so_pcb = NULL;
|
|
saved_unp_addr = unp->unp_addr;
|
|
unp->unp_addr = NULL;
|
|
unp->unp_refcount--;
|
|
freeunp = (unp->unp_refcount == 0);
|
|
if (saved_unp_addr != NULL)
|
|
free(saved_unp_addr, M_SONAME);
|
|
if (freeunp) {
|
|
UNP_PCB_LOCK_DESTROY(unp);
|
|
uma_zfree(unp_zone, unp);
|
|
} else
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (vp) {
|
|
int vfslocked;
|
|
|
|
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
|
|
vrele(vp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
if (local_unp_rights)
|
|
taskqueue_enqueue(taskqueue_thread, &unp_gc_task);
|
|
}
|
|
|
|
static int
|
|
uipc_disconnect(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
|
|
|
|
UNP_LINK_WLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 != NULL) {
|
|
UNP_PCB_LOCK(unp2);
|
|
unp_disconnect(unp, unp2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_WUNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_listen(struct socket *so, int backlog, struct thread *td)
|
|
{
|
|
struct unpcb *unp;
|
|
int error;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_vnode == NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (EINVAL);
|
|
}
|
|
|
|
SOCK_LOCK(so);
|
|
error = solisten_proto_check(so);
|
|
if (error == 0) {
|
|
cru2x(td->td_ucred, &unp->unp_peercred);
|
|
unp->unp_flags |= UNP_HAVEPCCACHED;
|
|
solisten_proto(so, backlog);
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_peeraddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
const struct sockaddr *sa;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
|
|
|
|
*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
UNP_LINK_RLOCK();
|
|
/*
|
|
* XXX: It seems that this test always fails even when connection is
|
|
* established. So, this else clause is added as workaround to
|
|
* return PF_LOCAL sockaddr.
|
|
*/
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 != NULL) {
|
|
UNP_PCB_LOCK(unp2);
|
|
if (unp2->unp_addr != NULL)
|
|
sa = (struct sockaddr *) unp2->unp_addr;
|
|
else
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
} else {
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
}
|
|
UNP_LINK_RUNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_rcvd(struct socket *so, int flags)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct socket *so2;
|
|
u_int mbcnt, sbcc;
|
|
u_long newhiwat;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
|
|
|
|
if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
|
|
panic("uipc_rcvd socktype %d", so->so_type);
|
|
|
|
/*
|
|
* Adjust backpressure on sender and wakeup any waiting to write.
|
|
*
|
|
* The unp lock is acquired to maintain the validity of the unp_conn
|
|
* pointer; no lock on unp2 is required as unp2->unp_socket will be
|
|
* static as long as we don't permit unp2 to disconnect from unp,
|
|
* which is prevented by the lock on unp. We cache values from
|
|
* so_rcv to avoid holding the so_rcv lock over the entire
|
|
* transaction on the remote so_snd.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
mbcnt = so->so_rcv.sb_mbcnt;
|
|
sbcc = so->so_rcv.sb_cc;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 == NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (0);
|
|
}
|
|
so2 = unp2->unp_socket;
|
|
SOCKBUF_LOCK(&so2->so_snd);
|
|
so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
|
|
newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
|
|
(void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
|
|
newhiwat, RLIM_INFINITY);
|
|
sowwakeup_locked(so2);
|
|
unp->unp_mbcnt = mbcnt;
|
|
unp->unp_cc = sbcc;
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct socket *so2;
|
|
u_int mbcnt_delta, sbcc;
|
|
u_int newhiwat;
|
|
int error = 0;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
|
|
|
|
if (flags & PRUS_OOB) {
|
|
error = EOPNOTSUPP;
|
|
goto release;
|
|
}
|
|
if (control != NULL && (error = unp_internalize(&control, td)))
|
|
goto release;
|
|
if ((nam != NULL) || (flags & PRUS_EOF))
|
|
UNP_LINK_WLOCK();
|
|
else
|
|
UNP_LINK_RLOCK();
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
{
|
|
const struct sockaddr *from;
|
|
|
|
unp2 = unp->unp_conn;
|
|
if (nam != NULL) {
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
if (unp2 != NULL) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
error = unp_connect(so, nam, td);
|
|
if (error)
|
|
break;
|
|
unp2 = unp->unp_conn;
|
|
}
|
|
|
|
/*
|
|
* Because connect() and send() are non-atomic in a sendto()
|
|
* with a target address, it's possible that the socket will
|
|
* have disconnected before the send() can run. In that case
|
|
* return the slightly counter-intuitive but otherwise
|
|
* correct error that the socket is not connected.
|
|
*/
|
|
if (unp2 == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
/* Lockless read. */
|
|
if (unp2->unp_flags & UNP_WANTCRED)
|
|
control = unp_addsockcred(td, control);
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_addr != NULL)
|
|
from = (struct sockaddr *)unp->unp_addr;
|
|
else
|
|
from = &sun_noname;
|
|
so2 = unp2->unp_socket;
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
|
|
sorwakeup_locked(so2);
|
|
m = NULL;
|
|
control = NULL;
|
|
} else {
|
|
SOCKBUF_UNLOCK(&so2->so_rcv);
|
|
error = ENOBUFS;
|
|
}
|
|
if (nam != NULL) {
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
UNP_PCB_LOCK(unp2);
|
|
unp_disconnect(unp, unp2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
break;
|
|
}
|
|
|
|
case SOCK_SEQPACKET:
|
|
case SOCK_STREAM:
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
if (nam != NULL) {
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
error = unp_connect(so, nam, td);
|
|
if (error)
|
|
break; /* XXX */
|
|
} else {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Lockless read. */
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
error = EPIPE;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Because connect() and send() are non-atomic in a sendto()
|
|
* with a target address, it's possible that the socket will
|
|
* have disconnected before the send() can run. In that case
|
|
* return the slightly counter-intuitive but otherwise
|
|
* correct error that the socket is not connected.
|
|
*
|
|
* Locking here must be done carefully: the linkage lock
|
|
* prevents interconnections between unpcbs from changing, so
|
|
* we can traverse from unp to unp2 without acquiring unp's
|
|
* lock. Socket buffer locks follow unpcb locks, so we can
|
|
* acquire both remote and lock socket buffer locks.
|
|
*/
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
so2 = unp2->unp_socket;
|
|
UNP_PCB_LOCK(unp2);
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
if (unp2->unp_flags & UNP_WANTCRED) {
|
|
/*
|
|
* Credentials are passed only once on SOCK_STREAM.
|
|
*/
|
|
unp2->unp_flags &= ~UNP_WANTCRED;
|
|
control = unp_addsockcred(td, control);
|
|
}
|
|
/*
|
|
* Send to paired receive port, and then reduce send buffer
|
|
* hiwater marks to maintain backpressure. Wake up readers.
|
|
*/
|
|
switch (so->so_type) {
|
|
case SOCK_STREAM:
|
|
if (control != NULL) {
|
|
if (sbappendcontrol_locked(&so2->so_rcv, m,
|
|
control))
|
|
control = NULL;
|
|
} else
|
|
sbappend_locked(&so2->so_rcv, m);
|
|
break;
|
|
|
|
case SOCK_SEQPACKET: {
|
|
const struct sockaddr *from;
|
|
|
|
from = &sun_noname;
|
|
if (sbappendaddr_locked(&so2->so_rcv, from, m,
|
|
control))
|
|
control = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* XXXRW: While fine for SOCK_STREAM, this conflates maximum
|
|
* datagram size and back-pressure for SOCK_SEQPACKET, which
|
|
* can lead to undesired return of EMSGSIZE on send instead
|
|
* of more desirable blocking.
|
|
*/
|
|
mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
|
|
unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
|
|
sbcc = so2->so_rcv.sb_cc;
|
|
sorwakeup_locked(so2);
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
|
|
newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
|
|
else
|
|
newhiwat = 0;
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
|
|
newhiwat, RLIM_INFINITY);
|
|
so->so_snd.sb_mbmax -= mbcnt_delta;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
unp2->unp_cc = sbcc;
|
|
UNP_PCB_UNLOCK(unp2);
|
|
m = NULL;
|
|
break;
|
|
|
|
default:
|
|
panic("uipc_send unknown socktype");
|
|
}
|
|
|
|
/*
|
|
* PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
|
|
*/
|
|
if (flags & PRUS_EOF) {
|
|
UNP_PCB_LOCK(unp);
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
|
|
if ((nam != NULL) || (flags & PRUS_EOF))
|
|
UNP_LINK_WUNLOCK();
|
|
else
|
|
UNP_LINK_RUNLOCK();
|
|
|
|
if (control != NULL && error != 0)
|
|
unp_dispose(control);
|
|
|
|
release:
|
|
if (control != NULL)
|
|
m_freem(control);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_sense(struct socket *so, struct stat *sb)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct socket *so2;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
|
|
|
|
sb->st_blksize = so->so_snd.sb_hiwat;
|
|
UNP_LINK_RLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp->unp_conn;
|
|
if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
|
|
unp2 != NULL) {
|
|
so2 = unp2->unp_socket;
|
|
sb->st_blksize += so2->so_rcv.sb_cc;
|
|
}
|
|
sb->st_dev = NODEV;
|
|
if (unp->unp_ino == 0)
|
|
unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
|
|
sb->st_ino = unp->unp_ino;
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_RUNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_shutdown(struct socket *so)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
|
|
|
|
UNP_LINK_WLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
UNP_PCB_UNLOCK(unp);
|
|
UNP_LINK_WUNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_sockaddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
struct unpcb *unp;
|
|
const struct sockaddr *sa;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
|
|
|
|
*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_addr != NULL)
|
|
sa = (struct sockaddr *) unp->unp_addr;
|
|
else
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (0);
|
|
}
|
|
|
|
static struct pr_usrreqs uipc_usrreqs_dgram = {
|
|
.pru_abort = uipc_abort,
|
|
.pru_accept = uipc_accept,
|
|
.pru_attach = uipc_attach,
|
|
.pru_bind = uipc_bind,
|
|
.pru_connect = uipc_connect,
|
|
.pru_connect2 = uipc_connect2,
|
|
.pru_detach = uipc_detach,
|
|
.pru_disconnect = uipc_disconnect,
|
|
.pru_listen = uipc_listen,
|
|
.pru_peeraddr = uipc_peeraddr,
|
|
.pru_rcvd = uipc_rcvd,
|
|
.pru_send = uipc_send,
|
|
.pru_sense = uipc_sense,
|
|
.pru_shutdown = uipc_shutdown,
|
|
.pru_sockaddr = uipc_sockaddr,
|
|
.pru_soreceive = soreceive_dgram,
|
|
.pru_close = uipc_close,
|
|
};
|
|
|
|
static struct pr_usrreqs uipc_usrreqs_seqpacket = {
|
|
.pru_abort = uipc_abort,
|
|
.pru_accept = uipc_accept,
|
|
.pru_attach = uipc_attach,
|
|
.pru_bind = uipc_bind,
|
|
.pru_connect = uipc_connect,
|
|
.pru_connect2 = uipc_connect2,
|
|
.pru_detach = uipc_detach,
|
|
.pru_disconnect = uipc_disconnect,
|
|
.pru_listen = uipc_listen,
|
|
.pru_peeraddr = uipc_peeraddr,
|
|
.pru_rcvd = uipc_rcvd,
|
|
.pru_send = uipc_send,
|
|
.pru_sense = uipc_sense,
|
|
.pru_shutdown = uipc_shutdown,
|
|
.pru_sockaddr = uipc_sockaddr,
|
|
.pru_soreceive = soreceive_generic, /* XXX: or...? */
|
|
.pru_close = uipc_close,
|
|
};
|
|
|
|
static struct pr_usrreqs uipc_usrreqs_stream = {
|
|
.pru_abort = uipc_abort,
|
|
.pru_accept = uipc_accept,
|
|
.pru_attach = uipc_attach,
|
|
.pru_bind = uipc_bind,
|
|
.pru_connect = uipc_connect,
|
|
.pru_connect2 = uipc_connect2,
|
|
.pru_detach = uipc_detach,
|
|
.pru_disconnect = uipc_disconnect,
|
|
.pru_listen = uipc_listen,
|
|
.pru_peeraddr = uipc_peeraddr,
|
|
.pru_rcvd = uipc_rcvd,
|
|
.pru_send = uipc_send,
|
|
.pru_sense = uipc_sense,
|
|
.pru_shutdown = uipc_shutdown,
|
|
.pru_sockaddr = uipc_sockaddr,
|
|
.pru_soreceive = soreceive_generic,
|
|
.pru_close = uipc_close,
|
|
};
|
|
|
|
static int
|
|
uipc_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
struct unpcb *unp;
|
|
struct xucred xu;
|
|
int error, optval;
|
|
|
|
if (sopt->sopt_level != 0)
|
|
return (EINVAL);
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
|
|
error = 0;
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case LOCAL_PEERCRED:
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_flags & UNP_HAVEPC)
|
|
xu = unp->unp_peercred;
|
|
else {
|
|
if (so->so_type == SOCK_STREAM)
|
|
error = ENOTCONN;
|
|
else
|
|
error = EINVAL;
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (error == 0)
|
|
error = sooptcopyout(sopt, &xu, sizeof(xu));
|
|
break;
|
|
|
|
case LOCAL_CREDS:
|
|
/* Unlocked read. */
|
|
optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
|
|
error = sooptcopyout(sopt, &optval, sizeof(optval));
|
|
break;
|
|
|
|
case LOCAL_CONNWAIT:
|
|
/* Unlocked read. */
|
|
optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
|
|
error = sooptcopyout(sopt, &optval, sizeof(optval));
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case LOCAL_CREDS:
|
|
case LOCAL_CONNWAIT:
|
|
error = sooptcopyin(sopt, &optval, sizeof(optval),
|
|
sizeof(optval));
|
|
if (error)
|
|
break;
|
|
|
|
#define OPTSET(bit) do { \
|
|
UNP_PCB_LOCK(unp); \
|
|
if (optval) \
|
|
unp->unp_flags |= bit; \
|
|
else \
|
|
unp->unp_flags &= ~bit; \
|
|
UNP_PCB_UNLOCK(unp); \
|
|
} while (0)
|
|
|
|
switch (sopt->sopt_name) {
|
|
case LOCAL_CREDS:
|
|
OPTSET(UNP_WANTCRED);
|
|
break;
|
|
|
|
case LOCAL_CONNWAIT:
|
|
OPTSET(UNP_CONNWAIT);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
#undef OPTSET
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
|
|
struct vnode *vp;
|
|
struct socket *so2, *so3;
|
|
struct unpcb *unp, *unp2, *unp3;
|
|
int error, len, vfslocked;
|
|
struct nameidata nd;
|
|
char buf[SOCK_MAXADDRLEN];
|
|
struct sockaddr *sa;
|
|
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
|
|
|
if (nam->sa_len > sizeof(struct sockaddr_un))
|
|
return (EINVAL);
|
|
len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
|
|
if (len <= 0)
|
|
return (EINVAL);
|
|
bcopy(soun->sun_path, buf, len);
|
|
buf[len] = 0;
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_flags & UNP_CONNECTING) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (EALREADY);
|
|
}
|
|
UNP_LINK_WUNLOCK();
|
|
unp->unp_flags |= UNP_CONNECTING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
|
|
sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKSHARED | LOCKLEAF,
|
|
UIO_SYSSPACE, buf, td);
|
|
error = namei(&nd);
|
|
if (error)
|
|
vp = NULL;
|
|
else
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_LOCKED(vp, "unp_connect");
|
|
vfslocked = NDHASGIANT(&nd);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (error)
|
|
goto bad;
|
|
|
|
if (vp->v_type != VSOCK) {
|
|
error = ENOTSOCK;
|
|
goto bad;
|
|
}
|
|
#ifdef MAC
|
|
error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
|
|
if (error)
|
|
goto bad;
|
|
#endif
|
|
error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
|
|
if (error)
|
|
goto bad;
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
|
|
|
/*
|
|
* Lock linkage lock for two reasons: make sure v_socket is stable,
|
|
* and to protect simultaneous locking of multiple pcbs.
|
|
*/
|
|
UNP_LINK_WLOCK();
|
|
VOP_UNP_CONNECT(vp, &so2);
|
|
if (so2 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
if (so->so_type != so2->so_type) {
|
|
error = EPROTOTYPE;
|
|
goto bad2;
|
|
}
|
|
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
|
|
if (so2->so_options & SO_ACCEPTCONN) {
|
|
CURVNET_SET(so2->so_vnet);
|
|
so3 = sonewconn(so2, 0);
|
|
CURVNET_RESTORE();
|
|
} else
|
|
so3 = NULL;
|
|
if (so3 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
unp = sotounpcb(so);
|
|
unp2 = sotounpcb(so2);
|
|
unp3 = sotounpcb(so3);
|
|
UNP_PCB_LOCK(unp);
|
|
UNP_PCB_LOCK(unp2);
|
|
UNP_PCB_LOCK(unp3);
|
|
if (unp2->unp_addr != NULL) {
|
|
bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
|
|
unp3->unp_addr = (struct sockaddr_un *) sa;
|
|
sa = NULL;
|
|
}
|
|
|
|
/*
|
|
* The connecter's (client's) credentials are copied from its
|
|
* process structure at the time of connect() (which is now).
|
|
*/
|
|
cru2x(td->td_ucred, &unp3->unp_peercred);
|
|
unp3->unp_flags |= UNP_HAVEPC;
|
|
|
|
/*
|
|
* The receiver's (server's) credentials are copied from the
|
|
* unp_peercred member of socket on which the former called
|
|
* listen(); uipc_listen() cached that process's credentials
|
|
* at that time so we can use them now.
|
|
*/
|
|
KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
|
|
("unp_connect: listener without cached peercred"));
|
|
memcpy(&unp->unp_peercred, &unp2->unp_peercred,
|
|
sizeof(unp->unp_peercred));
|
|
unp->unp_flags |= UNP_HAVEPC;
|
|
if (unp2->unp_flags & UNP_WANTCRED)
|
|
unp3->unp_flags |= UNP_WANTCRED;
|
|
UNP_PCB_UNLOCK(unp3);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
UNP_PCB_UNLOCK(unp);
|
|
#ifdef MAC
|
|
mac_socketpeer_set_from_socket(so, so3);
|
|
mac_socketpeer_set_from_socket(so3, so);
|
|
#endif
|
|
|
|
so2 = so3;
|
|
}
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
|
unp2 = sotounpcb(so2);
|
|
KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
|
|
UNP_PCB_LOCK(unp);
|
|
UNP_PCB_LOCK(unp2);
|
|
error = unp_connect2(so, so2, PRU_CONNECT);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
UNP_PCB_UNLOCK(unp);
|
|
bad2:
|
|
UNP_LINK_WUNLOCK();
|
|
if (vfslocked)
|
|
/*
|
|
* Giant has been previously acquired. This means filesystem
|
|
* isn't MPSAFE. Do it once again.
|
|
*/
|
|
mtx_lock(&Giant);
|
|
bad:
|
|
if (vp != NULL)
|
|
vput(vp);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
free(sa, M_SONAME);
|
|
UNP_LINK_WLOCK();
|
|
UNP_PCB_LOCK(unp);
|
|
unp->unp_flags &= ~UNP_CONNECTING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unp_connect2(struct socket *so, struct socket *so2, int req)
|
|
{
|
|
struct unpcb *unp;
|
|
struct unpcb *unp2;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
|
|
unp2 = sotounpcb(so2);
|
|
KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
|
|
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
UNP_PCB_LOCK_ASSERT(unp2);
|
|
|
|
if (so2->so_type != so->so_type)
|
|
return (EPROTOTYPE);
|
|
unp->unp_conn = unp2;
|
|
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
unp2->unp_conn = unp;
|
|
if (req == PRU_CONNECT &&
|
|
((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
|
|
soisconnecting(so);
|
|
else
|
|
soisconnected(so);
|
|
soisconnected(so2);
|
|
break;
|
|
|
|
default:
|
|
panic("unp_connect2");
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
|
|
{
|
|
struct socket *so;
|
|
|
|
KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
|
|
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
UNP_PCB_LOCK_ASSERT(unp2);
|
|
|
|
unp->unp_conn = NULL;
|
|
switch (unp->unp_socket->so_type) {
|
|
case SOCK_DGRAM:
|
|
LIST_REMOVE(unp, unp_reflink);
|
|
so = unp->unp_socket;
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED;
|
|
SOCK_UNLOCK(so);
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
soisdisconnected(unp->unp_socket);
|
|
unp2->unp_conn = NULL;
|
|
soisdisconnected(unp2->unp_socket);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* unp_pcblist() walks the global list of struct unpcb's to generate a
|
|
* pointer list, bumping the refcount on each unpcb. It then copies them out
|
|
* sequentially, validating the generation number on each to see if it has
|
|
* been detached. All of this is necessary because copyout() may sleep on
|
|
* disk I/O.
|
|
*/
|
|
static int
|
|
unp_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n;
|
|
int freeunp;
|
|
struct unpcb *unp, **unp_list;
|
|
unp_gen_t gencnt;
|
|
struct xunpgen *xug;
|
|
struct unp_head *head;
|
|
struct xunpcb *xu;
|
|
|
|
switch ((intptr_t)arg1) {
|
|
case SOCK_STREAM:
|
|
head = &unp_shead;
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
head = &unp_dhead;
|
|
break;
|
|
|
|
case SOCK_SEQPACKET:
|
|
head = &unp_sphead;
|
|
break;
|
|
|
|
default:
|
|
panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
|
|
}
|
|
|
|
/*
|
|
* The process of preparing the PCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == NULL) {
|
|
n = unp_count;
|
|
req->oldidx = 2 * (sizeof *xug)
|
|
+ (n + n/8) * sizeof(struct xunpcb);
|
|
return (0);
|
|
}
|
|
|
|
if (req->newptr != NULL)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
|
|
UNP_LIST_LOCK();
|
|
gencnt = unp_gencnt;
|
|
n = unp_count;
|
|
UNP_LIST_UNLOCK();
|
|
|
|
xug->xug_len = sizeof *xug;
|
|
xug->xug_count = n;
|
|
xug->xug_gen = gencnt;
|
|
xug->xug_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, xug, sizeof *xug);
|
|
if (error) {
|
|
free(xug, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
|
|
|
|
UNP_LIST_LOCK();
|
|
for (unp = LIST_FIRST(head), i = 0; unp && i < n;
|
|
unp = LIST_NEXT(unp, unp_link)) {
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_gencnt <= gencnt) {
|
|
if (cr_cansee(req->td->td_ucred,
|
|
unp->unp_socket->so_cred)) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
continue;
|
|
}
|
|
unp_list[i++] = unp;
|
|
unp->unp_refcount++;
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
UNP_LIST_UNLOCK();
|
|
n = i; /* In case we lost some during malloc. */
|
|
|
|
error = 0;
|
|
xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
|
|
for (i = 0; i < n; i++) {
|
|
unp = unp_list[i];
|
|
UNP_PCB_LOCK(unp);
|
|
unp->unp_refcount--;
|
|
if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
|
|
xu->xu_len = sizeof *xu;
|
|
xu->xu_unpp = unp;
|
|
/*
|
|
* XXX - need more locking here to protect against
|
|
* connect/disconnect races for SMP.
|
|
*/
|
|
if (unp->unp_addr != NULL)
|
|
bcopy(unp->unp_addr, &xu->xu_addr,
|
|
unp->unp_addr->sun_len);
|
|
if (unp->unp_conn != NULL &&
|
|
unp->unp_conn->unp_addr != NULL)
|
|
bcopy(unp->unp_conn->unp_addr,
|
|
&xu->xu_caddr,
|
|
unp->unp_conn->unp_addr->sun_len);
|
|
bcopy(unp, &xu->xu_unp, sizeof *unp);
|
|
sotoxsocket(unp->unp_socket, &xu->xu_socket);
|
|
UNP_PCB_UNLOCK(unp);
|
|
error = SYSCTL_OUT(req, xu, sizeof *xu);
|
|
} else {
|
|
freeunp = (unp->unp_refcount == 0);
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (freeunp) {
|
|
UNP_PCB_LOCK_DESTROY(unp);
|
|
uma_zfree(unp_zone, unp);
|
|
}
|
|
}
|
|
}
|
|
free(xu, M_TEMP);
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state. If the
|
|
* generation differs from what we told her before, she knows
|
|
* that something happened while we were processing this
|
|
* request, and it might be necessary to retry.
|
|
*/
|
|
xug->xug_gen = unp_gencnt;
|
|
xug->xug_sogen = so_gencnt;
|
|
xug->xug_count = unp_count;
|
|
error = SYSCTL_OUT(req, xug, sizeof *xug);
|
|
}
|
|
free(unp_list, M_TEMP);
|
|
free(xug, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
(void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
|
|
"List of active local datagram sockets");
|
|
SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
(void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
|
|
"List of active local stream sockets");
|
|
SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
|
|
CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
(void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
|
|
"List of active local seqpacket sockets");
|
|
|
|
static void
|
|
unp_shutdown(struct unpcb *unp)
|
|
{
|
|
struct unpcb *unp2;
|
|
struct socket *so;
|
|
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
|
|
unp2 = unp->unp_conn;
|
|
if ((unp->unp_socket->so_type == SOCK_STREAM ||
|
|
(unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
|
|
so = unp2->unp_socket;
|
|
if (so != NULL)
|
|
socantrcvmore(so);
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_drop(struct unpcb *unp, int errno)
|
|
{
|
|
struct socket *so = unp->unp_socket;
|
|
struct unpcb *unp2;
|
|
|
|
UNP_LINK_WLOCK_ASSERT();
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
|
|
so->so_error = errno;
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 == NULL)
|
|
return;
|
|
UNP_PCB_LOCK(unp2);
|
|
unp_disconnect(unp, unp2);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
|
|
static void
|
|
unp_freerights(struct file **rp, int fdcount)
|
|
{
|
|
int i;
|
|
struct file *fp;
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fp = *rp;
|
|
*rp++ = NULL;
|
|
unp_discard(fp);
|
|
}
|
|
}
|
|
|
|
static int
|
|
unp_externalize(struct mbuf *control, struct mbuf **controlp)
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
|
int i;
|
|
int *fdp;
|
|
struct file **rp;
|
|
struct file *fp;
|
|
void *data;
|
|
socklen_t clen = control->m_len, datalen;
|
|
int error, newfds;
|
|
int f;
|
|
u_int newlen;
|
|
|
|
UNP_LINK_UNLOCK_ASSERT();
|
|
|
|
error = 0;
|
|
if (controlp != NULL) /* controlp == NULL => free control messages */
|
|
*controlp = NULL;
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
|
|
if (cm->cmsg_level == SOL_SOCKET
|
|
&& cm->cmsg_type == SCM_RIGHTS) {
|
|
newfds = datalen / sizeof(struct file *);
|
|
rp = data;
|
|
|
|
/* If we're not outputting the descriptors free them. */
|
|
if (error || controlp == NULL) {
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
FILEDESC_XLOCK(td->td_proc->p_fd);
|
|
/* if the new FD's will not fit free them. */
|
|
if (!fdavail(td, newfds)) {
|
|
FILEDESC_XUNLOCK(td->td_proc->p_fd);
|
|
error = EMSGSIZE;
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* Now change each pointer to an fd in the global
|
|
* table to an integer that is the index to the local
|
|
* fd table entry that we set up to point to the
|
|
* global one we are transferring.
|
|
*/
|
|
newlen = newfds * sizeof(int);
|
|
*controlp = sbcreatecontrol(NULL, newlen,
|
|
SCM_RIGHTS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
FILEDESC_XUNLOCK(td->td_proc->p_fd);
|
|
error = E2BIG;
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
|
|
fdp = (int *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
for (i = 0; i < newfds; i++) {
|
|
if (fdalloc(td, 0, &f))
|
|
panic("unp_externalize fdalloc failed");
|
|
fp = *rp++;
|
|
td->td_proc->p_fd->fd_ofiles[f] = fp;
|
|
unp_externalize_fp(fp);
|
|
*fdp++ = f;
|
|
}
|
|
FILEDESC_XUNLOCK(td->td_proc->p_fd);
|
|
} else {
|
|
/* We can just copy anything else across. */
|
|
if (error || controlp == NULL)
|
|
goto next;
|
|
*controlp = sbcreatecontrol(NULL, datalen,
|
|
cm->cmsg_type, cm->cmsg_level);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto next;
|
|
}
|
|
bcopy(data,
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
|
|
datalen);
|
|
}
|
|
controlp = &(*controlp)->m_next;
|
|
|
|
next:
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
unp_zone_change(void *tag)
|
|
{
|
|
|
|
uma_zone_set_max(unp_zone, maxsockets);
|
|
}
|
|
|
|
static void
|
|
unp_init(void)
|
|
{
|
|
|
|
#ifdef VIMAGE
|
|
if (!IS_DEFAULT_VNET(curvnet))
|
|
return;
|
|
#endif
|
|
unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
if (unp_zone == NULL)
|
|
panic("unp_init");
|
|
uma_zone_set_max(unp_zone, maxsockets);
|
|
EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
|
|
NULL, EVENTHANDLER_PRI_ANY);
|
|
LIST_INIT(&unp_dhead);
|
|
LIST_INIT(&unp_shead);
|
|
LIST_INIT(&unp_sphead);
|
|
SLIST_INIT(&unp_defers);
|
|
TASK_INIT(&unp_gc_task, 0, unp_gc, NULL);
|
|
TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
|
|
UNP_LINK_LOCK_INIT();
|
|
UNP_LIST_LOCK_INIT();
|
|
UNP_DEFERRED_LOCK_INIT();
|
|
}
|
|
|
|
static int
|
|
unp_internalize(struct mbuf **controlp, struct thread *td)
|
|
{
|
|
struct mbuf *control = *controlp;
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdescp = p->p_fd;
|
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
|
struct cmsgcred *cmcred;
|
|
struct file **rp;
|
|
struct file *fp;
|
|
struct timeval *tv;
|
|
int i, fd, *fdp;
|
|
void *data;
|
|
socklen_t clen = control->m_len, datalen;
|
|
int error, oldfds;
|
|
u_int newlen;
|
|
|
|
UNP_LINK_UNLOCK_ASSERT();
|
|
|
|
error = 0;
|
|
*controlp = NULL;
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
|
|
|| cm->cmsg_len > clen) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
|
|
|
|
switch (cm->cmsg_type) {
|
|
/*
|
|
* Fill in credential information.
|
|
*/
|
|
case SCM_CREDS:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
|
|
SCM_CREDS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
cmcred = (struct cmsgcred *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
cmcred->cmcred_pid = p->p_pid;
|
|
cmcred->cmcred_uid = td->td_ucred->cr_ruid;
|
|
cmcred->cmcred_gid = td->td_ucred->cr_rgid;
|
|
cmcred->cmcred_euid = td->td_ucred->cr_uid;
|
|
cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
|
|
CMGROUP_MAX);
|
|
for (i = 0; i < cmcred->cmcred_ngroups; i++)
|
|
cmcred->cmcred_groups[i] =
|
|
td->td_ucred->cr_groups[i];
|
|
break;
|
|
|
|
case SCM_RIGHTS:
|
|
oldfds = datalen / sizeof (int);
|
|
/*
|
|
* Check that all the FDs passed in refer to legal
|
|
* files. If not, reject the entire operation.
|
|
*/
|
|
fdp = data;
|
|
FILEDESC_SLOCK(fdescp);
|
|
for (i = 0; i < oldfds; i++) {
|
|
fd = *fdp++;
|
|
if (fd < 0 || fd >= fdescp->fd_nfiles ||
|
|
fdescp->fd_ofiles[fd] == NULL) {
|
|
FILEDESC_SUNLOCK(fdescp);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
fp = fdescp->fd_ofiles[fd];
|
|
if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
|
|
FILEDESC_SUNLOCK(fdescp);
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Now replace the integer FDs with pointers to the
|
|
* associated global file table entry..
|
|
*/
|
|
newlen = oldfds * sizeof(struct file *);
|
|
*controlp = sbcreatecontrol(NULL, newlen,
|
|
SCM_RIGHTS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
FILEDESC_SUNLOCK(fdescp);
|
|
error = E2BIG;
|
|
goto out;
|
|
}
|
|
fdp = data;
|
|
rp = (struct file **)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
for (i = 0; i < oldfds; i++) {
|
|
fp = fdescp->fd_ofiles[*fdp++];
|
|
*rp++ = fp;
|
|
unp_internalize_fp(fp);
|
|
}
|
|
FILEDESC_SUNLOCK(fdescp);
|
|
break;
|
|
|
|
case SCM_TIMESTAMP:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*tv),
|
|
SCM_TIMESTAMP, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
tv = (struct timeval *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
microtime(tv);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
controlp = &(*controlp)->m_next;
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
|
|
out:
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
|
|
static struct mbuf *
|
|
unp_addsockcred(struct thread *td, struct mbuf *control)
|
|
{
|
|
struct mbuf *m, *n, *n_prev;
|
|
struct sockcred *sc;
|
|
const struct cmsghdr *cm;
|
|
int ngroups;
|
|
int i;
|
|
|
|
ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
|
|
m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
|
|
if (m == NULL)
|
|
return (control);
|
|
|
|
sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
|
|
sc->sc_uid = td->td_ucred->cr_ruid;
|
|
sc->sc_euid = td->td_ucred->cr_uid;
|
|
sc->sc_gid = td->td_ucred->cr_rgid;
|
|
sc->sc_egid = td->td_ucred->cr_gid;
|
|
sc->sc_ngroups = ngroups;
|
|
for (i = 0; i < sc->sc_ngroups; i++)
|
|
sc->sc_groups[i] = td->td_ucred->cr_groups[i];
|
|
|
|
/*
|
|
* Unlink SCM_CREDS control messages (struct cmsgcred), since just
|
|
* created SCM_CREDS control message (struct sockcred) has another
|
|
* format.
|
|
*/
|
|
if (control != NULL)
|
|
for (n = control, n_prev = NULL; n != NULL;) {
|
|
cm = mtod(n, struct cmsghdr *);
|
|
if (cm->cmsg_level == SOL_SOCKET &&
|
|
cm->cmsg_type == SCM_CREDS) {
|
|
if (n_prev == NULL)
|
|
control = n->m_next;
|
|
else
|
|
n_prev->m_next = n->m_next;
|
|
n = m_free(n);
|
|
} else {
|
|
n_prev = n;
|
|
n = n->m_next;
|
|
}
|
|
}
|
|
|
|
/* Prepend it to the head. */
|
|
m->m_next = control;
|
|
return (m);
|
|
}
|
|
|
|
static struct unpcb *
|
|
fptounp(struct file *fp)
|
|
{
|
|
struct socket *so;
|
|
|
|
if (fp->f_type != DTYPE_SOCKET)
|
|
return (NULL);
|
|
if ((so = fp->f_data) == NULL)
|
|
return (NULL);
|
|
if (so->so_proto->pr_domain != &localdomain)
|
|
return (NULL);
|
|
return sotounpcb(so);
|
|
}
|
|
|
|
static void
|
|
unp_discard(struct file *fp)
|
|
{
|
|
struct unp_defer *dr;
|
|
|
|
if (unp_externalize_fp(fp)) {
|
|
dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
|
|
dr->ud_fp = fp;
|
|
UNP_DEFERRED_LOCK();
|
|
SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
|
|
UNP_DEFERRED_UNLOCK();
|
|
atomic_add_int(&unp_defers_count, 1);
|
|
taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
|
|
} else
|
|
(void) closef(fp, (struct thread *)NULL);
|
|
}
|
|
|
|
static void
|
|
unp_process_defers(void *arg __unused, int pending)
|
|
{
|
|
struct unp_defer *dr;
|
|
SLIST_HEAD(, unp_defer) drl;
|
|
int count;
|
|
|
|
SLIST_INIT(&drl);
|
|
for (;;) {
|
|
UNP_DEFERRED_LOCK();
|
|
if (SLIST_FIRST(&unp_defers) == NULL) {
|
|
UNP_DEFERRED_UNLOCK();
|
|
break;
|
|
}
|
|
SLIST_SWAP(&unp_defers, &drl, unp_defer);
|
|
UNP_DEFERRED_UNLOCK();
|
|
count = 0;
|
|
while ((dr = SLIST_FIRST(&drl)) != NULL) {
|
|
SLIST_REMOVE_HEAD(&drl, ud_link);
|
|
closef(dr->ud_fp, NULL);
|
|
free(dr, M_TEMP);
|
|
count++;
|
|
}
|
|
atomic_add_int(&unp_defers_count, -count);
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_internalize_fp(struct file *fp)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
UNP_LINK_WLOCK();
|
|
if ((unp = fptounp(fp)) != NULL) {
|
|
unp->unp_file = fp;
|
|
unp->unp_msgcount++;
|
|
}
|
|
fhold(fp);
|
|
unp_rights++;
|
|
UNP_LINK_WUNLOCK();
|
|
}
|
|
|
|
static int
|
|
unp_externalize_fp(struct file *fp)
|
|
{
|
|
struct unpcb *unp;
|
|
int ret;
|
|
|
|
UNP_LINK_WLOCK();
|
|
if ((unp = fptounp(fp)) != NULL) {
|
|
unp->unp_msgcount--;
|
|
ret = 1;
|
|
} else
|
|
ret = 0;
|
|
unp_rights--;
|
|
UNP_LINK_WUNLOCK();
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* unp_defer indicates whether additional work has been defered for a future
|
|
* pass through unp_gc(). It is thread local and does not require explicit
|
|
* synchronization.
|
|
*/
|
|
static int unp_marked;
|
|
static int unp_unreachable;
|
|
|
|
static void
|
|
unp_accessable(struct file *fp)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
if ((unp = fptounp(fp)) == NULL)
|
|
return;
|
|
if (unp->unp_gcflag & UNPGC_REF)
|
|
return;
|
|
unp->unp_gcflag &= ~UNPGC_DEAD;
|
|
unp->unp_gcflag |= UNPGC_REF;
|
|
unp_marked++;
|
|
}
|
|
|
|
static void
|
|
unp_gc_process(struct unpcb *unp)
|
|
{
|
|
struct socket *soa;
|
|
struct socket *so;
|
|
struct file *fp;
|
|
|
|
/* Already processed. */
|
|
if (unp->unp_gcflag & UNPGC_SCANNED)
|
|
return;
|
|
fp = unp->unp_file;
|
|
|
|
/*
|
|
* Check for a socket potentially in a cycle. It must be in a
|
|
* queue as indicated by msgcount, and this must equal the file
|
|
* reference count. Note that when msgcount is 0 the file is NULL.
|
|
*/
|
|
if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
|
|
unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
|
|
unp->unp_gcflag |= UNPGC_DEAD;
|
|
unp_unreachable++;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Mark all sockets we reference with RIGHTS.
|
|
*/
|
|
so = unp->unp_socket;
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
unp_scan(so->so_rcv.sb_mb, unp_accessable);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
|
|
/*
|
|
* Mark all sockets in our accept queue.
|
|
*/
|
|
ACCEPT_LOCK();
|
|
TAILQ_FOREACH(soa, &so->so_comp, so_list) {
|
|
SOCKBUF_LOCK(&soa->so_rcv);
|
|
unp_scan(soa->so_rcv.sb_mb, unp_accessable);
|
|
SOCKBUF_UNLOCK(&soa->so_rcv);
|
|
}
|
|
ACCEPT_UNLOCK();
|
|
unp->unp_gcflag |= UNPGC_SCANNED;
|
|
}
|
|
|
|
static int unp_recycled;
|
|
SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
|
|
"Number of unreachable sockets claimed by the garbage collector.");
|
|
|
|
static int unp_taskcount;
|
|
SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
|
|
"Number of times the garbage collector has run.");
|
|
|
|
static void
|
|
unp_gc(__unused void *arg, int pending)
|
|
{
|
|
struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
|
|
NULL };
|
|
struct unp_head **head;
|
|
struct file *f, **unref;
|
|
struct unpcb *unp;
|
|
int i, total;
|
|
|
|
unp_taskcount++;
|
|
UNP_LIST_LOCK();
|
|
/*
|
|
* First clear all gc flags from previous runs.
|
|
*/
|
|
for (head = heads; *head != NULL; head++)
|
|
LIST_FOREACH(unp, *head, unp_link)
|
|
unp->unp_gcflag = 0;
|
|
|
|
/*
|
|
* Scan marking all reachable sockets with UNPGC_REF. Once a socket
|
|
* is reachable all of the sockets it references are reachable.
|
|
* Stop the scan once we do a complete loop without discovering
|
|
* a new reachable socket.
|
|
*/
|
|
do {
|
|
unp_unreachable = 0;
|
|
unp_marked = 0;
|
|
for (head = heads; *head != NULL; head++)
|
|
LIST_FOREACH(unp, *head, unp_link)
|
|
unp_gc_process(unp);
|
|
} while (unp_marked);
|
|
UNP_LIST_UNLOCK();
|
|
if (unp_unreachable == 0)
|
|
return;
|
|
|
|
/*
|
|
* Allocate space for a local list of dead unpcbs.
|
|
*/
|
|
unref = malloc(unp_unreachable * sizeof(struct file *),
|
|
M_TEMP, M_WAITOK);
|
|
|
|
/*
|
|
* Iterate looking for sockets which have been specifically marked
|
|
* as as unreachable and store them locally.
|
|
*/
|
|
UNP_LINK_RLOCK();
|
|
UNP_LIST_LOCK();
|
|
for (total = 0, head = heads; *head != NULL; head++)
|
|
LIST_FOREACH(unp, *head, unp_link)
|
|
if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
|
|
f = unp->unp_file;
|
|
if (unp->unp_msgcount == 0 || f == NULL ||
|
|
f->f_count != unp->unp_msgcount)
|
|
continue;
|
|
unref[total++] = f;
|
|
fhold(f);
|
|
KASSERT(total <= unp_unreachable,
|
|
("unp_gc: incorrect unreachable count."));
|
|
}
|
|
UNP_LIST_UNLOCK();
|
|
UNP_LINK_RUNLOCK();
|
|
|
|
/*
|
|
* Now flush all sockets, free'ing rights. This will free the
|
|
* struct files associated with these sockets but leave each socket
|
|
* with one remaining ref.
|
|
*/
|
|
for (i = 0; i < total; i++) {
|
|
struct socket *so;
|
|
|
|
so = unref[i]->f_data;
|
|
CURVNET_SET(so->so_vnet);
|
|
sorflush(so);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
/*
|
|
* And finally release the sockets so they can be reclaimed.
|
|
*/
|
|
for (i = 0; i < total; i++)
|
|
fdrop(unref[i], NULL);
|
|
unp_recycled += total;
|
|
free(unref, M_TEMP);
|
|
}
|
|
|
|
static void
|
|
unp_dispose(struct mbuf *m)
|
|
{
|
|
|
|
if (m)
|
|
unp_scan(m, unp_discard);
|
|
}
|
|
|
|
static void
|
|
unp_scan(struct mbuf *m0, void (*op)(struct file *))
|
|
{
|
|
struct mbuf *m;
|
|
struct file **rp;
|
|
struct cmsghdr *cm;
|
|
void *data;
|
|
int i;
|
|
socklen_t clen, datalen;
|
|
int qfds;
|
|
|
|
while (m0 != NULL) {
|
|
for (m = m0; m; m = m->m_next) {
|
|
if (m->m_type != MT_CONTROL)
|
|
continue;
|
|
|
|
cm = mtod(m, struct cmsghdr *);
|
|
clen = m->m_len;
|
|
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_len > clen)
|
|
break;
|
|
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len
|
|
- (caddr_t)data;
|
|
|
|
if (cm->cmsg_level == SOL_SOCKET &&
|
|
cm->cmsg_type == SCM_RIGHTS) {
|
|
qfds = datalen / sizeof (struct file *);
|
|
rp = data;
|
|
for (i = 0; i < qfds; i++)
|
|
(*op)(*rp++);
|
|
}
|
|
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
}
|
|
m0 = m0->m_act;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A helper function called by VFS before socket-type vnode reclamation.
|
|
* For an active vnode it clears unp_vnode pointer and decrements unp_vnode
|
|
* use count.
|
|
*/
|
|
void
|
|
vfs_unp_reclaim(struct vnode *vp)
|
|
{
|
|
struct socket *so;
|
|
struct unpcb *unp;
|
|
int active;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
|
|
KASSERT(vp->v_type == VSOCK,
|
|
("vfs_unp_reclaim: vp->v_type != VSOCK"));
|
|
|
|
active = 0;
|
|
UNP_LINK_WLOCK();
|
|
VOP_UNP_CONNECT(vp, &so);
|
|
if (so == NULL)
|
|
goto done;
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL)
|
|
goto done;
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_vnode == vp) {
|
|
VOP_UNP_DETACH(vp);
|
|
unp->unp_vnode = NULL;
|
|
active = 1;
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
done:
|
|
UNP_LINK_WUNLOCK();
|
|
if (active)
|
|
vunref(vp);
|
|
}
|
|
|
|
#ifdef DDB
|
|
static void
|
|
db_print_indent(int indent)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < indent; i++)
|
|
db_printf(" ");
|
|
}
|
|
|
|
static void
|
|
db_print_unpflags(int unp_flags)
|
|
{
|
|
int comma;
|
|
|
|
comma = 0;
|
|
if (unp_flags & UNP_HAVEPC) {
|
|
db_printf("%sUNP_HAVEPC", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_HAVEPCCACHED) {
|
|
db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_WANTCRED) {
|
|
db_printf("%sUNP_WANTCRED", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_CONNWAIT) {
|
|
db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_CONNECTING) {
|
|
db_printf("%sUNP_CONNECTING", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_BINDING) {
|
|
db_printf("%sUNP_BINDING", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
db_print_xucred(int indent, struct xucred *xu)
|
|
{
|
|
int comma, i;
|
|
|
|
db_print_indent(indent);
|
|
db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
|
|
xu->cr_version, xu->cr_uid, xu->cr_ngroups);
|
|
db_print_indent(indent);
|
|
db_printf("cr_groups: ");
|
|
comma = 0;
|
|
for (i = 0; i < xu->cr_ngroups; i++) {
|
|
db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
|
|
comma = 1;
|
|
}
|
|
db_printf("\n");
|
|
}
|
|
|
|
static void
|
|
db_print_unprefs(int indent, struct unp_head *uh)
|
|
{
|
|
struct unpcb *unp;
|
|
int counter;
|
|
|
|
counter = 0;
|
|
LIST_FOREACH(unp, uh, unp_reflink) {
|
|
if (counter % 4 == 0)
|
|
db_print_indent(indent);
|
|
db_printf("%p ", unp);
|
|
if (counter % 4 == 3)
|
|
db_printf("\n");
|
|
counter++;
|
|
}
|
|
if (counter != 0 && counter % 4 != 0)
|
|
db_printf("\n");
|
|
}
|
|
|
|
DB_SHOW_COMMAND(unpcb, db_show_unpcb)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
if (!have_addr) {
|
|
db_printf("usage: show unpcb <addr>\n");
|
|
return;
|
|
}
|
|
unp = (struct unpcb *)addr;
|
|
|
|
db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
|
|
unp->unp_vnode);
|
|
|
|
db_printf("unp_ino: %d unp_conn: %p\n", unp->unp_ino,
|
|
unp->unp_conn);
|
|
|
|
db_printf("unp_refs:\n");
|
|
db_print_unprefs(2, &unp->unp_refs);
|
|
|
|
/* XXXRW: Would be nice to print the full address, if any. */
|
|
db_printf("unp_addr: %p\n", unp->unp_addr);
|
|
|
|
db_printf("unp_cc: %d unp_mbcnt: %d unp_gencnt: %llu\n",
|
|
unp->unp_cc, unp->unp_mbcnt,
|
|
(unsigned long long)unp->unp_gencnt);
|
|
|
|
db_printf("unp_flags: %x (", unp->unp_flags);
|
|
db_print_unpflags(unp->unp_flags);
|
|
db_printf(")\n");
|
|
|
|
db_printf("unp_peercred:\n");
|
|
db_print_xucred(2, &unp->unp_peercred);
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db_printf("unp_refcount: %u\n", unp->unp_refcount);
|
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}
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#endif
|